4 * Copyright (C) 2012 by Darren Reed.
6 * See the IPFILTER.LICENCE file for details on licencing.
8 * Copyright 2008 Sun Microsystems.
13 #if defined(KERNEL) || defined(_KERNEL)
19 #include <sys/errno.h>
20 #include <sys/types.h>
21 #include <sys/param.h>
23 #if defined(_KERNEL) && defined(__FreeBSD_version) && \
24 (__FreeBSD_version >= 220000)
25 # if (__FreeBSD_version >= 400000)
26 # if !defined(IPFILTER_LKM)
27 # include "opt_inet6.h"
29 # if (__FreeBSD_version == 400019)
30 # define CSUM_DELAY_DATA
33 # include <sys/filio.h>
35 # include <sys/ioctl.h>
37 #if (defined(__SVR4) || defined(__svr4__)) && defined(sun)
38 # include <sys/filio.h>
41 # include <sys/fcntl.h>
44 # include <sys/systm.h>
45 # include <sys/file.h>
51 # include <sys/file.h>
59 #if !defined(__SVR4) && !defined(__svr4__) && !defined(__hpux) && \
61 # include <sys/mbuf.h>
64 # include <sys/byteorder.h>
66 # if (SOLARIS2 < 5) && defined(sun)
67 # include <sys/dditypes.h>
71 # define _NET_ROUTE_INCLUDED
74 # include <sys/protosw.h>
76 #include <sys/socket.h>
81 #include <netinet/in.h>
82 #include <netinet/in_systm.h>
83 #include <netinet/ip.h>
84 #if defined(__sgi) && defined(IFF_DRVRLOCK) /* IRIX 6 */
85 # include <sys/hashing.h>
86 # include <netinet/in_var.h>
88 #include <netinet/tcp.h>
89 #if (!defined(__sgi) && !defined(AIX)) || defined(_KERNEL)
90 # include <netinet/udp.h>
91 # include <netinet/ip_icmp.h>
94 # undef _NET_ROUTE_INCLUDED
99 #include "netinet/ip_compat.h"
101 # include <netinet/icmp6.h>
102 # if !SOLARIS && defined(_KERNEL) && !defined(__osf__) && !defined(__hpux)
103 # include <netinet6/in6_var.h>
106 #include "netinet/ip_fil.h"
107 #include "netinet/ip_nat.h"
108 #include "netinet/ip_frag.h"
109 #include "netinet/ip_state.h"
110 #include "netinet/ip_proxy.h"
111 #include "netinet/ip_auth.h"
113 # include "netinet/ip_scan.h"
115 #include "netinet/ip_sync.h"
116 #include "netinet/ip_lookup.h"
117 #include "netinet/ip_pool.h"
118 #include "netinet/ip_htable.h"
119 #ifdef IPFILTER_COMPILED
120 # include "netinet/ip_rules.h"
122 #if defined(IPFILTER_BPF) && defined(_KERNEL)
123 # include <net/bpf.h>
125 #if defined(__FreeBSD_version) && (__FreeBSD_version >= 300000)
126 # include <sys/malloc.h>
128 #include "netinet/ipl.h"
130 #if defined(__NetBSD__) && (__NetBSD_Version__ >= 104230000)
131 # include <sys/callout.h>
132 extern struct callout ipf_slowtimer_ch;
134 #if defined(__OpenBSD__)
135 # include <sys/timeout.h>
136 extern struct timeout ipf_slowtimer_ch;
138 /* END OF INCLUDES */
141 static const char sccsid[] = "@(#)fil.c 1.36 6/5/96 (C) 1993-2000 Darren Reed";
142 static const char rcsid[] = "@(#)$FreeBSD$";
143 /* static const char rcsid[] = "@(#)$Id: fil.c,v 2.243.2.125 2007/10/10 09:27:20 darrenr Exp $"; */
150 extern int blockreason;
153 #define LBUMP(x) softc->x++
154 #define LBUMPD(x, y) do { softc->x.y++; DT(y); } while (0)
156 static INLINE int ipf_check_ipf __P((fr_info_t *, frentry_t *, int));
157 static u_32_t ipf_checkcipso __P((fr_info_t *, u_char *, int));
158 static u_32_t ipf_checkripso __P((u_char *));
159 static u_32_t ipf_decaps __P((fr_info_t *, u_32_t, int));
161 static frentry_t *ipf_dolog __P((fr_info_t *, u_32_t *));
163 static int ipf_flushlist __P((ipf_main_softc_t *, int *,
165 static int ipf_flush_groups __P((ipf_main_softc_t *, frgroup_t **,
167 static ipfunc_t ipf_findfunc __P((ipfunc_t));
168 static void *ipf_findlookup __P((ipf_main_softc_t *, int,
170 i6addr_t *, i6addr_t *));
171 static frentry_t *ipf_firewall __P((fr_info_t *, u_32_t *));
172 static int ipf_fr_matcharray __P((fr_info_t *, int *));
173 static int ipf_frruleiter __P((ipf_main_softc_t *, void *, int,
175 static void ipf_funcfini __P((ipf_main_softc_t *, frentry_t *));
176 static int ipf_funcinit __P((ipf_main_softc_t *, frentry_t *));
177 static int ipf_geniter __P((ipf_main_softc_t *, ipftoken_t *,
179 static void ipf_getstat __P((ipf_main_softc_t *,
180 struct friostat *, int));
181 static int ipf_group_flush __P((ipf_main_softc_t *, frgroup_t *));
182 static void ipf_group_free __P((frgroup_t *));
183 static int ipf_grpmapfini __P((struct ipf_main_softc_s *,
185 static int ipf_grpmapinit __P((struct ipf_main_softc_s *,
187 static frentry_t *ipf_nextrule __P((ipf_main_softc_t *, int, int,
189 static int ipf_portcheck __P((frpcmp_t *, u_32_t));
190 static INLINE int ipf_pr_ah __P((fr_info_t *));
191 static INLINE void ipf_pr_esp __P((fr_info_t *));
192 static INLINE void ipf_pr_gre __P((fr_info_t *));
193 static INLINE void ipf_pr_udp __P((fr_info_t *));
194 static INLINE void ipf_pr_tcp __P((fr_info_t *));
195 static INLINE void ipf_pr_icmp __P((fr_info_t *));
196 static INLINE void ipf_pr_ipv4hdr __P((fr_info_t *));
197 static INLINE void ipf_pr_short __P((fr_info_t *, int));
198 static INLINE int ipf_pr_tcpcommon __P((fr_info_t *));
199 static INLINE int ipf_pr_udpcommon __P((fr_info_t *));
200 static void ipf_rule_delete __P((ipf_main_softc_t *, frentry_t *f,
202 static void ipf_rule_expire_insert __P((ipf_main_softc_t *,
204 static int ipf_synclist __P((ipf_main_softc_t *, frentry_t *,
206 static void ipf_token_flush __P((ipf_main_softc_t *));
207 static void ipf_token_unlink __P((ipf_main_softc_t *,
209 static ipftuneable_t *ipf_tune_findbyname __P((ipftuneable_t *,
211 static ipftuneable_t *ipf_tune_findbycookie __P((ipftuneable_t **, void *,
213 static int ipf_updateipid __P((fr_info_t *));
214 static int ipf_settimeout __P((struct ipf_main_softc_s *,
215 struct ipftuneable *,
217 #if !defined(_KERNEL) || (!defined(__NetBSD__) && !defined(__OpenBSD__) && \
218 !defined(__FreeBSD__)) || \
219 FREEBSD_LT_REV(501000) || NETBSD_LT_REV(105000000) || \
220 OPENBSD_LT_REV(200006)
221 static int ppsratecheck(struct timeval *, int *, int);
226 * bit values for identifying presence of individual IP options
227 * All of these tables should be ordered by increasing key value on the left
228 * hand side to allow for binary searching of the array and include a trailer
229 * with a 0 for the bitmask for linear searches to easily find the end with.
231 static const struct optlist ipopts[20] = {
232 { IPOPT_NOP, 0x000001 },
233 { IPOPT_RR, 0x000002 },
234 { IPOPT_ZSU, 0x000004 },
235 { IPOPT_MTUP, 0x000008 },
236 { IPOPT_MTUR, 0x000010 },
237 { IPOPT_ENCODE, 0x000020 },
238 { IPOPT_TS, 0x000040 },
239 { IPOPT_TR, 0x000080 },
240 { IPOPT_SECURITY, 0x000100 },
241 { IPOPT_LSRR, 0x000200 },
242 { IPOPT_E_SEC, 0x000400 },
243 { IPOPT_CIPSO, 0x000800 },
244 { IPOPT_SATID, 0x001000 },
245 { IPOPT_SSRR, 0x002000 },
246 { IPOPT_ADDEXT, 0x004000 },
247 { IPOPT_VISA, 0x008000 },
248 { IPOPT_IMITD, 0x010000 },
249 { IPOPT_EIP, 0x020000 },
250 { IPOPT_FINN, 0x040000 },
255 static const struct optlist ip6exthdr[] = {
256 { IPPROTO_HOPOPTS, 0x000001 },
257 { IPPROTO_IPV6, 0x000002 },
258 { IPPROTO_ROUTING, 0x000004 },
259 { IPPROTO_FRAGMENT, 0x000008 },
260 { IPPROTO_ESP, 0x000010 },
261 { IPPROTO_AH, 0x000020 },
262 { IPPROTO_NONE, 0x000040 },
263 { IPPROTO_DSTOPTS, 0x000080 },
264 { IPPROTO_MOBILITY, 0x000100 },
270 * bit values for identifying presence of individual IP security options
272 static const struct optlist secopt[8] = {
273 { IPSO_CLASS_RES4, 0x01 },
274 { IPSO_CLASS_TOPS, 0x02 },
275 { IPSO_CLASS_SECR, 0x04 },
276 { IPSO_CLASS_RES3, 0x08 },
277 { IPSO_CLASS_CONF, 0x10 },
278 { IPSO_CLASS_UNCL, 0x20 },
279 { IPSO_CLASS_RES2, 0x40 },
280 { IPSO_CLASS_RES1, 0x80 }
283 char ipfilter_version[] = IPL_VERSION;
296 #ifdef IPFILTER_COMPILED
299 #ifdef IPFILTER_CKSUM
313 * Table of functions available for use with call rules.
315 static ipfunc_resolve_t ipf_availfuncs[] = {
316 { "srcgrpmap", ipf_srcgrpmap, ipf_grpmapinit, ipf_grpmapfini },
317 { "dstgrpmap", ipf_dstgrpmap, ipf_grpmapinit, ipf_grpmapfini },
318 { "", NULL, NULL, NULL }
321 static ipftuneable_t ipf_main_tuneables[] = {
322 { { (void *)offsetof(struct ipf_main_softc_s, ipf_flags) },
323 "ipf_flags", 0, 0xffffffff,
324 stsizeof(ipf_main_softc_t, ipf_flags),
326 { { (void *)offsetof(struct ipf_main_softc_s, ipf_active) },
328 stsizeof(ipf_main_softc_t, ipf_active),
329 IPFT_RDONLY, NULL, NULL },
330 { { (void *)offsetof(ipf_main_softc_t, ipf_control_forwarding) },
331 "control_forwarding", 0, 1,
332 stsizeof(ipf_main_softc_t, ipf_control_forwarding),
334 { { (void *)offsetof(ipf_main_softc_t, ipf_update_ipid) },
336 stsizeof(ipf_main_softc_t, ipf_update_ipid),
338 { { (void *)offsetof(ipf_main_softc_t, ipf_chksrc) },
340 stsizeof(ipf_main_softc_t, ipf_chksrc),
342 { { (void *)offsetof(ipf_main_softc_t, ipf_minttl) },
344 stsizeof(ipf_main_softc_t, ipf_minttl),
346 { { (void *)offsetof(ipf_main_softc_t, ipf_icmpminfragmtu) },
347 "icmp_minfragmtu", 0, 1,
348 stsizeof(ipf_main_softc_t, ipf_icmpminfragmtu),
350 { { (void *)offsetof(ipf_main_softc_t, ipf_pass) },
351 "default_pass", 0, 0xffffffff,
352 stsizeof(ipf_main_softc_t, ipf_pass),
354 { { (void *)offsetof(ipf_main_softc_t, ipf_tcpidletimeout) },
355 "tcp_idle_timeout", 1, 0x7fffffff,
356 stsizeof(ipf_main_softc_t, ipf_tcpidletimeout),
357 0, NULL, ipf_settimeout },
358 { { (void *)offsetof(ipf_main_softc_t, ipf_tcpclosewait) },
359 "tcp_close_wait", 1, 0x7fffffff,
360 stsizeof(ipf_main_softc_t, ipf_tcpclosewait),
361 0, NULL, ipf_settimeout },
362 { { (void *)offsetof(ipf_main_softc_t, ipf_tcplastack) },
363 "tcp_last_ack", 1, 0x7fffffff,
364 stsizeof(ipf_main_softc_t, ipf_tcplastack),
365 0, NULL, ipf_settimeout },
366 { { (void *)offsetof(ipf_main_softc_t, ipf_tcptimeout) },
367 "tcp_timeout", 1, 0x7fffffff,
368 stsizeof(ipf_main_softc_t, ipf_tcptimeout),
369 0, NULL, ipf_settimeout },
370 { { (void *)offsetof(ipf_main_softc_t, ipf_tcpsynsent) },
371 "tcp_syn_sent", 1, 0x7fffffff,
372 stsizeof(ipf_main_softc_t, ipf_tcpsynsent),
373 0, NULL, ipf_settimeout },
374 { { (void *)offsetof(ipf_main_softc_t, ipf_tcpsynrecv) },
375 "tcp_syn_received", 1, 0x7fffffff,
376 stsizeof(ipf_main_softc_t, ipf_tcpsynrecv),
377 0, NULL, ipf_settimeout },
378 { { (void *)offsetof(ipf_main_softc_t, ipf_tcpclosed) },
379 "tcp_closed", 1, 0x7fffffff,
380 stsizeof(ipf_main_softc_t, ipf_tcpclosed),
381 0, NULL, ipf_settimeout },
382 { { (void *)offsetof(ipf_main_softc_t, ipf_tcphalfclosed) },
383 "tcp_half_closed", 1, 0x7fffffff,
384 stsizeof(ipf_main_softc_t, ipf_tcphalfclosed),
385 0, NULL, ipf_settimeout },
386 { { (void *)offsetof(ipf_main_softc_t, ipf_tcptimewait) },
387 "tcp_time_wait", 1, 0x7fffffff,
388 stsizeof(ipf_main_softc_t, ipf_tcptimewait),
389 0, NULL, ipf_settimeout },
390 { { (void *)offsetof(ipf_main_softc_t, ipf_udptimeout) },
391 "udp_timeout", 1, 0x7fffffff,
392 stsizeof(ipf_main_softc_t, ipf_udptimeout),
393 0, NULL, ipf_settimeout },
394 { { (void *)offsetof(ipf_main_softc_t, ipf_udpacktimeout) },
395 "udp_ack_timeout", 1, 0x7fffffff,
396 stsizeof(ipf_main_softc_t, ipf_udpacktimeout),
397 0, NULL, ipf_settimeout },
398 { { (void *)offsetof(ipf_main_softc_t, ipf_icmptimeout) },
399 "icmp_timeout", 1, 0x7fffffff,
400 stsizeof(ipf_main_softc_t, ipf_icmptimeout),
401 0, NULL, ipf_settimeout },
402 { { (void *)offsetof(ipf_main_softc_t, ipf_icmpacktimeout) },
403 "icmp_ack_timeout", 1, 0x7fffffff,
404 stsizeof(ipf_main_softc_t, ipf_icmpacktimeout),
405 0, NULL, ipf_settimeout },
406 { { (void *)offsetof(ipf_main_softc_t, ipf_iptimeout) },
407 "ip_timeout", 1, 0x7fffffff,
408 stsizeof(ipf_main_softc_t, ipf_iptimeout),
409 0, NULL, ipf_settimeout },
410 #if defined(INSTANCES) && defined(_KERNEL)
411 { { (void *)offsetof(ipf_main_softc_t, ipf_get_loopback) },
412 "intercept_loopback", 0, 1,
413 stsizeof(ipf_main_softc_t, ipf_get_loopback),
414 0, NULL, ipf_set_loopback },
424 * The next section of code is a collection of small routines that set
425 * fields in the fr_info_t structure passed based on properties of the
426 * current packet. There are different routines for the same protocol
427 * for each of IPv4 and IPv6. Adding a new protocol, for which there
428 * will "special" inspection for setup, is now more easily done by adding
429 * a new routine and expanding the ipf_pr_ipinit*() function rather than by
430 * adding more code to a growing switch statement.
433 static INLINE int ipf_pr_ah6 __P((fr_info_t *));
434 static INLINE void ipf_pr_esp6 __P((fr_info_t *));
435 static INLINE void ipf_pr_gre6 __P((fr_info_t *));
436 static INLINE void ipf_pr_udp6 __P((fr_info_t *));
437 static INLINE void ipf_pr_tcp6 __P((fr_info_t *));
438 static INLINE void ipf_pr_icmp6 __P((fr_info_t *));
439 static INLINE void ipf_pr_ipv6hdr __P((fr_info_t *));
440 static INLINE void ipf_pr_short6 __P((fr_info_t *, int));
441 static INLINE int ipf_pr_hopopts6 __P((fr_info_t *));
442 static INLINE int ipf_pr_mobility6 __P((fr_info_t *));
443 static INLINE int ipf_pr_routing6 __P((fr_info_t *));
444 static INLINE int ipf_pr_dstopts6 __P((fr_info_t *));
445 static INLINE int ipf_pr_fragment6 __P((fr_info_t *));
446 static INLINE struct ip6_ext *ipf_pr_ipv6exthdr __P((fr_info_t *, int, int));
449 /* ------------------------------------------------------------------------ */
450 /* Function: ipf_pr_short6 */
452 /* Parameters: fin(I) - pointer to packet information */
453 /* xmin(I) - minimum header size */
456 /* This is function enforces the 'is a packet too short to be legit' rule */
457 /* for IPv6 and marks the packet with FI_SHORT if so. See function comment */
458 /* for ipf_pr_short() for more details. */
459 /* ------------------------------------------------------------------------ */
461 ipf_pr_short6(fin, xmin)
466 if (fin->fin_dlen < xmin)
467 fin->fin_flx |= FI_SHORT;
471 /* ------------------------------------------------------------------------ */
472 /* Function: ipf_pr_ipv6hdr */
474 /* Parameters: fin(I) - pointer to packet information */
477 /* Copy values from the IPv6 header into the fr_info_t struct and call the */
478 /* per-protocol analyzer if it exists. In validating the packet, a protocol*/
479 /* analyzer may pullup or free the packet itself so we need to be vigiliant */
480 /* of that possibility arising. */
481 /* ------------------------------------------------------------------------ */
486 ip6_t *ip6 = (ip6_t *)fin->fin_ip;
487 int p, go = 1, i, hdrcount;
488 fr_ip_t *fi = &fin->fin_fi;
499 fi->fi_ttl = ip6->ip6_hlim;
500 fi->fi_src.in6 = ip6->ip6_src;
501 fin->fin_crc += fi->fi_src.i6[0];
502 fin->fin_crc += fi->fi_src.i6[1];
503 fin->fin_crc += fi->fi_src.i6[2];
504 fin->fin_crc += fi->fi_src.i6[3];
505 fi->fi_dst.in6 = ip6->ip6_dst;
506 fin->fin_crc += fi->fi_dst.i6[0];
507 fin->fin_crc += fi->fi_dst.i6[1];
508 fin->fin_crc += fi->fi_dst.i6[2];
509 fin->fin_crc += fi->fi_dst.i6[3];
511 if (IN6_IS_ADDR_MULTICAST(&fi->fi_dst.in6))
512 fin->fin_flx |= FI_MULTICAST|FI_MBCAST;
515 while (go && !(fin->fin_flx & FI_SHORT)) {
528 case IPPROTO_ICMPV6 :
538 case IPPROTO_HOPOPTS :
539 p = ipf_pr_hopopts6(fin);
542 case IPPROTO_MOBILITY :
543 p = ipf_pr_mobility6(fin);
546 case IPPROTO_DSTOPTS :
547 p = ipf_pr_dstopts6(fin);
550 case IPPROTO_ROUTING :
551 p = ipf_pr_routing6(fin);
564 for (i = 0; ip6exthdr[i].ol_bit != 0; i++)
565 if (ip6exthdr[i].ol_val == p) {
566 fin->fin_flx |= ip6exthdr[i].ol_bit;
576 case IPPROTO_FRAGMENT :
577 p = ipf_pr_fragment6(fin);
579 * Given that the only fragments we want to let through
580 * (where fin_off != 0) are those where the non-first
581 * fragments only have data, we can safely stop looking
582 * at headers if this is a non-leading fragment.
584 if (fin->fin_off != 0)
595 * It is important to note that at this point, for the
596 * extension headers (go != 0), the entire header may not have
597 * been pulled up when the code gets to this point. This is
598 * only done for "go != 0" because the other header handlers
599 * will all pullup their complete header. The other indicator
600 * of an incomplete packet is that this was just an extension
603 if ((go != 0) && (p != IPPROTO_NONE) &&
604 (ipf_pr_pullup(fin, 0) == -1)) {
611 * Some of the above functions, like ipf_pr_esp6(), can call ipf_pullup
612 * and destroy whatever packet was here. The caller of this function
613 * expects us to return if there is a problem with ipf_pullup.
615 if (fin->fin_m == NULL) {
616 ipf_main_softc_t *softc = fin->fin_main_soft;
618 LBUMPD(ipf_stats[fin->fin_out], fr_v6_bad);
625 * IPv6 fragment case 1 - see comment for ipf_pr_fragment6().
626 * "go != 0" imples the above loop hasn't arrived at a layer 4 header.
628 if ((go != 0) && (fin->fin_flx & FI_FRAG) && (fin->fin_off == 0)) {
629 ipf_main_softc_t *softc = fin->fin_main_soft;
631 fin->fin_flx |= FI_BAD;
632 DT2(ipf_fi_bad_ipv6_frag_1, fr_info_t *, fin, int, go);
633 LBUMPD(ipf_stats[fin->fin_out], fr_v6_badfrag);
634 LBUMP(ipf_stats[fin->fin_out].fr_v6_bad);
639 /* ------------------------------------------------------------------------ */
640 /* Function: ipf_pr_ipv6exthdr */
641 /* Returns: struct ip6_ext * - pointer to the start of the next header */
642 /* or NULL if there is a prolblem. */
643 /* Parameters: fin(I) - pointer to packet information */
644 /* multiple(I) - flag indicating yes/no if multiple occurances */
645 /* of this extension header are allowed. */
646 /* proto(I) - protocol number for this extension header */
649 /* This function embodies a number of common checks that all IPv6 extension */
650 /* headers must be subjected to. For example, making sure the packet is */
651 /* big enough for it to be in, checking if it is repeated and setting a */
652 /* flag to indicate its presence. */
653 /* ------------------------------------------------------------------------ */
654 static INLINE struct ip6_ext *
655 ipf_pr_ipv6exthdr(fin, multiple, proto)
659 ipf_main_softc_t *softc = fin->fin_main_soft;
664 fin->fin_flx |= FI_V6EXTHDR;
666 /* 8 is default length of extension hdr */
667 if ((fin->fin_dlen - 8) < 0) {
668 fin->fin_flx |= FI_SHORT;
669 LBUMPD(ipf_stats[fin->fin_out], fr_v6_ext_short);
673 if (ipf_pr_pullup(fin, 8) == -1) {
674 LBUMPD(ipf_stats[fin->fin_out], fr_v6_ext_pullup);
681 case IPPROTO_FRAGMENT :
685 shift = 8 + (hdr->ip6e_len << 3);
689 if (shift > fin->fin_dlen) { /* Nasty extension header length? */
690 fin->fin_flx |= FI_BAD;
691 DT3(ipf_fi_bad_pr_ipv6exthdr_len, fr_info_t *, fin, u_short, shift, u_short, fin->fin_dlen);
692 LBUMPD(ipf_stats[fin->fin_out], fr_v6_ext_hlen);
696 fin->fin_dp = (char *)fin->fin_dp + shift;
697 fin->fin_dlen -= shift;
700 * If we have seen a fragment header, do not set any flags to indicate
701 * the presence of this extension header as it has no impact on the
702 * end result until after it has been defragmented.
704 if (fin->fin_flx & FI_FRAG)
707 for (i = 0; ip6exthdr[i].ol_bit != 0; i++)
708 if (ip6exthdr[i].ol_val == proto) {
710 * Most IPv6 extension headers are only allowed once.
712 if ((multiple == 0) &&
713 ((fin->fin_optmsk & ip6exthdr[i].ol_bit) != 0)) {
714 fin->fin_flx |= FI_BAD;
715 DT2(ipf_fi_bad_ipv6exthdr_once, fr_info_t *, fin, u_int, (fin->fin_optmsk & ip6exthdr[i].ol_bit));
717 fin->fin_optmsk |= ip6exthdr[i].ol_bit;
725 /* ------------------------------------------------------------------------ */
726 /* Function: ipf_pr_hopopts6 */
727 /* Returns: int - value of the next header or IPPROTO_NONE if error */
728 /* Parameters: fin(I) - pointer to packet information */
731 /* This is function checks pending hop by hop options extension header */
732 /* ------------------------------------------------------------------------ */
739 hdr = ipf_pr_ipv6exthdr(fin, 0, IPPROTO_HOPOPTS);
742 return hdr->ip6e_nxt;
746 /* ------------------------------------------------------------------------ */
747 /* Function: ipf_pr_mobility6 */
748 /* Returns: int - value of the next header or IPPROTO_NONE if error */
749 /* Parameters: fin(I) - pointer to packet information */
752 /* This is function checks the IPv6 mobility extension header */
753 /* ------------------------------------------------------------------------ */
755 ipf_pr_mobility6(fin)
760 hdr = ipf_pr_ipv6exthdr(fin, 0, IPPROTO_MOBILITY);
763 return hdr->ip6e_nxt;
767 /* ------------------------------------------------------------------------ */
768 /* Function: ipf_pr_routing6 */
769 /* Returns: int - value of the next header or IPPROTO_NONE if error */
770 /* Parameters: fin(I) - pointer to packet information */
773 /* This is function checks pending routing extension header */
774 /* ------------------------------------------------------------------------ */
779 struct ip6_routing *hdr;
781 hdr = (struct ip6_routing *)ipf_pr_ipv6exthdr(fin, 0, IPPROTO_ROUTING);
785 switch (hdr->ip6r_type)
789 * Nasty extension header length?
791 if (((hdr->ip6r_len >> 1) < hdr->ip6r_segleft) ||
792 (hdr->ip6r_segleft && (hdr->ip6r_len & 1))) {
793 ipf_main_softc_t *softc = fin->fin_main_soft;
795 fin->fin_flx |= FI_BAD;
796 DT1(ipf_fi_bad_routing6, fr_info_t *, fin);
797 LBUMPD(ipf_stats[fin->fin_out], fr_v6_rh_bad);
806 return hdr->ip6r_nxt;
810 /* ------------------------------------------------------------------------ */
811 /* Function: ipf_pr_fragment6 */
812 /* Returns: int - value of the next header or IPPROTO_NONE if error */
813 /* Parameters: fin(I) - pointer to packet information */
816 /* Examine the IPv6 fragment header and extract fragment offset information.*/
818 /* Fragments in IPv6 are extraordinarily difficult to deal with - much more */
819 /* so than in IPv4. There are 5 cases of fragments with IPv6 that all */
820 /* packets with a fragment header can fit into. They are as follows: */
822 /* 1. [IPv6][0-n EH][FH][0-n EH] (no L4HDR present) */
823 /* 2. [IPV6][0-n EH][FH][0-n EH][L4HDR part] (short) */
824 /* 3. [IPV6][0-n EH][FH][L4HDR part][0-n data] (short) */
825 /* 4. [IPV6][0-n EH][FH][0-n EH][L4HDR][0-n data] */
826 /* 5. [IPV6][0-n EH][FH][data] */
828 /* IPV6 = IPv6 header, FH = Fragment Header, */
829 /* 0-n EH = 0 or more extension headers, 0-n data = 0 or more bytes of data */
831 /* Packets that match 1, 2, 3 will be dropped as the only reasonable */
832 /* scenario in which they happen is in extreme circumstances that are most */
833 /* likely to be an indication of an attack rather than normal traffic. */
834 /* A type 3 packet may be sent by an attacked after a type 4 packet. There */
835 /* are two rules that can be used to guard against type 3 packets: L4 */
836 /* headers must always be in a packet that has the offset field set to 0 */
837 /* and no packet is allowed to overlay that where offset = 0. */
838 /* ------------------------------------------------------------------------ */
840 ipf_pr_fragment6(fin)
843 ipf_main_softc_t *softc = fin->fin_main_soft;
844 struct ip6_frag *frag;
846 fin->fin_flx |= FI_FRAG;
848 frag = (struct ip6_frag *)ipf_pr_ipv6exthdr(fin, 0, IPPROTO_FRAGMENT);
850 LBUMPD(ipf_stats[fin->fin_out], fr_v6_frag_bad);
854 if ((frag->ip6f_offlg & IP6F_MORE_FRAG) != 0) {
856 * Any fragment that isn't the last fragment must have its
857 * length as a multiple of 8.
859 if ((fin->fin_plen & 7) != 0) {
860 fin->fin_flx |= FI_BAD;
861 DT2(ipf_fi_bad_frag_not_8, fr_info_t *, fin, u_int, (fin->fin_plen & 7));
865 fin->fin_fraghdr = frag;
866 fin->fin_id = frag->ip6f_ident;
867 fin->fin_off = ntohs(frag->ip6f_offlg & IP6F_OFF_MASK);
868 if (fin->fin_off != 0)
869 fin->fin_flx |= FI_FRAGBODY;
872 * Jumbograms aren't handled, so the max. length is 64k
874 if ((fin->fin_off << 3) + fin->fin_dlen > 65535) {
875 fin->fin_flx |= FI_BAD;
876 DT2(ipf_fi_bad_jumbogram, fr_info_t *, fin, u_int, ((fin->fin_off << 3) + fin->fin_dlen));
880 * We don't know where the transport layer header (or whatever is next
881 * is), as it could be behind destination options (amongst others) so
882 * return the fragment header as the type of packet this is. Note that
883 * this effectively disables the fragment cache for > 1 protocol at a
886 return frag->ip6f_nxt;
890 /* ------------------------------------------------------------------------ */
891 /* Function: ipf_pr_dstopts6 */
892 /* Returns: int - value of the next header or IPPROTO_NONE if error */
893 /* Parameters: fin(I) - pointer to packet information */
896 /* This is function checks pending destination options extension header */
897 /* ------------------------------------------------------------------------ */
902 ipf_main_softc_t *softc = fin->fin_main_soft;
905 hdr = ipf_pr_ipv6exthdr(fin, 0, IPPROTO_DSTOPTS);
907 LBUMPD(ipf_stats[fin->fin_out], fr_v6_dst_bad);
910 return hdr->ip6e_nxt;
914 /* ------------------------------------------------------------------------ */
915 /* Function: ipf_pr_icmp6 */
917 /* Parameters: fin(I) - pointer to packet information */
920 /* This routine is mainly concerned with determining the minimum valid size */
921 /* for an ICMPv6 packet. */
922 /* ------------------------------------------------------------------------ */
927 int minicmpsz = sizeof(struct icmp6_hdr);
928 struct icmp6_hdr *icmp6;
930 if (ipf_pr_pullup(fin, ICMP6ERR_MINPKTLEN - sizeof(ip6_t)) == -1) {
931 ipf_main_softc_t *softc = fin->fin_main_soft;
933 LBUMPD(ipf_stats[fin->fin_out], fr_v6_icmp6_pullup);
937 if (fin->fin_dlen > 1) {
942 fin->fin_data[0] = *(u_short *)icmp6;
944 if ((icmp6->icmp6_type & ICMP6_INFOMSG_MASK) != 0)
945 fin->fin_flx |= FI_ICMPQUERY;
947 switch (icmp6->icmp6_type)
949 case ICMP6_ECHO_REPLY :
950 case ICMP6_ECHO_REQUEST :
951 if (fin->fin_dlen >= 6)
952 fin->fin_data[1] = icmp6->icmp6_id;
953 minicmpsz = ICMP6ERR_MINPKTLEN - sizeof(ip6_t);
956 case ICMP6_DST_UNREACH :
957 case ICMP6_PACKET_TOO_BIG :
958 case ICMP6_TIME_EXCEEDED :
959 case ICMP6_PARAM_PROB :
960 fin->fin_flx |= FI_ICMPERR;
961 minicmpsz = ICMP6ERR_IPICMPHLEN - sizeof(ip6_t);
962 if (fin->fin_plen < ICMP6ERR_IPICMPHLEN)
965 if (M_LEN(fin->fin_m) < fin->fin_plen) {
966 if (ipf_coalesce(fin) != 1)
970 if (ipf_pr_pullup(fin, ICMP6ERR_MINPKTLEN) == -1)
974 * If the destination of this packet doesn't match the
975 * source of the original packet then this packet is
979 ip6 = (ip6_t *)((char *)icmp6 + ICMPERR_ICMPHLEN);
980 if (IP6_NEQ(&fin->fin_fi.fi_dst,
981 (i6addr_t *)&ip6->ip6_src)) {
982 fin->fin_flx |= FI_BAD;
983 DT1(ipf_fi_bad_icmp6, fr_info_t *, fin);
991 ipf_pr_short6(fin, minicmpsz);
992 if ((fin->fin_flx & (FI_SHORT|FI_BAD)) == 0) {
993 u_char p = fin->fin_p;
995 fin->fin_p = IPPROTO_ICMPV6;
1002 /* ------------------------------------------------------------------------ */
1003 /* Function: ipf_pr_udp6 */
1005 /* Parameters: fin(I) - pointer to packet information */
1008 /* Analyse the packet for IPv6/UDP properties. */
1009 /* Is not expected to be called for fragmented packets. */
1010 /* ------------------------------------------------------------------------ */
1016 if (ipf_pr_udpcommon(fin) == 0) {
1017 u_char p = fin->fin_p;
1019 fin->fin_p = IPPROTO_UDP;
1020 ipf_checkv6sum(fin);
1026 /* ------------------------------------------------------------------------ */
1027 /* Function: ipf_pr_tcp6 */
1029 /* Parameters: fin(I) - pointer to packet information */
1032 /* Analyse the packet for IPv6/TCP properties. */
1033 /* Is not expected to be called for fragmented packets. */
1034 /* ------------------------------------------------------------------------ */
1040 if (ipf_pr_tcpcommon(fin) == 0) {
1041 u_char p = fin->fin_p;
1043 fin->fin_p = IPPROTO_TCP;
1044 ipf_checkv6sum(fin);
1050 /* ------------------------------------------------------------------------ */
1051 /* Function: ipf_pr_esp6 */
1053 /* Parameters: fin(I) - pointer to packet information */
1056 /* Analyse the packet for ESP properties. */
1057 /* The minimum length is taken to be the SPI (32bits) plus a tail (32bits) */
1058 /* even though the newer ESP packets must also have a sequence number that */
1059 /* is 32bits as well, it is not possible(?) to determine the version from a */
1060 /* simple packet header. */
1061 /* ------------------------------------------------------------------------ */
1067 if ((fin->fin_off == 0) && (ipf_pr_pullup(fin, 8) == -1)) {
1068 ipf_main_softc_t *softc = fin->fin_main_soft;
1070 LBUMPD(ipf_stats[fin->fin_out], fr_v6_esp_pullup);
1076 /* ------------------------------------------------------------------------ */
1077 /* Function: ipf_pr_ah6 */
1078 /* Returns: int - value of the next header or IPPROTO_NONE if error */
1079 /* Parameters: fin(I) - pointer to packet information */
1082 /* Analyse the packet for AH properties. */
1083 /* The minimum length is taken to be the combination of all fields in the */
1084 /* header being present and no authentication data (null algorithm used.) */
1085 /* ------------------------------------------------------------------------ */
1092 fin->fin_flx |= FI_AH;
1094 ah = (authhdr_t *)ipf_pr_ipv6exthdr(fin, 0, IPPROTO_HOPOPTS);
1096 ipf_main_softc_t *softc = fin->fin_main_soft;
1098 LBUMPD(ipf_stats[fin->fin_out], fr_v6_ah_bad);
1099 return IPPROTO_NONE;
1102 ipf_pr_short6(fin, sizeof(*ah));
1105 * No need for another pullup, ipf_pr_ipv6exthdr() will pullup
1106 * enough data to satisfy ah_next (the very first one.)
1112 /* ------------------------------------------------------------------------ */
1113 /* Function: ipf_pr_gre6 */
1115 /* Parameters: fin(I) - pointer to packet information */
1117 /* Analyse the packet for GRE properties. */
1118 /* ------------------------------------------------------------------------ */
1125 if (ipf_pr_pullup(fin, sizeof(grehdr_t)) == -1) {
1126 ipf_main_softc_t *softc = fin->fin_main_soft;
1128 LBUMPD(ipf_stats[fin->fin_out], fr_v6_gre_pullup);
1133 if (GRE_REV(gre->gr_flags) == 1)
1134 fin->fin_data[0] = gre->gr_call;
1136 #endif /* USE_INET6 */
1139 /* ------------------------------------------------------------------------ */
1140 /* Function: ipf_pr_pullup */
1141 /* Returns: int - 0 == pullup succeeded, -1 == failure */
1142 /* Parameters: fin(I) - pointer to packet information */
1143 /* plen(I) - length (excluding L3 header) to pullup */
1145 /* Short inline function to cut down on code duplication to perform a call */
1146 /* to ipf_pullup to ensure there is the required amount of data, */
1147 /* consecutively in the packet buffer. */
1149 /* This function pulls up 'extra' data at the location of fin_dp. fin_dp */
1150 /* points to the first byte after the complete layer 3 header, which will */
1151 /* include all of the known extension headers for IPv6 or options for IPv4. */
1153 /* Since fr_pullup() expects the total length of bytes to be pulled up, it */
1154 /* is necessary to add those we can already assume to be pulled up (fin_dp */
1155 /* - fin_ip) to what is passed through. */
1156 /* ------------------------------------------------------------------------ */
1158 ipf_pr_pullup(fin, plen)
1162 ipf_main_softc_t *softc = fin->fin_main_soft;
1164 if (fin->fin_m != NULL) {
1165 if (fin->fin_dp != NULL)
1166 plen += (char *)fin->fin_dp -
1167 ((char *)fin->fin_ip + fin->fin_hlen);
1168 plen += fin->fin_hlen;
1169 if (M_LEN(fin->fin_m) < plen + fin->fin_ipoff) {
1170 #if defined(_KERNEL)
1171 if (ipf_pullup(fin->fin_m, fin, plen) == NULL) {
1172 DT(ipf_pullup_fail);
1173 LBUMP(ipf_stats[fin->fin_out].fr_pull[1]);
1176 LBUMP(ipf_stats[fin->fin_out].fr_pull[0]);
1178 LBUMP(ipf_stats[fin->fin_out].fr_pull[1]);
1180 * Fake ipf_pullup failing
1182 fin->fin_reason = FRB_PULLUP;
1183 *fin->fin_mp = NULL;
1194 /* ------------------------------------------------------------------------ */
1195 /* Function: ipf_pr_short */
1197 /* Parameters: fin(I) - pointer to packet information */
1198 /* xmin(I) - minimum header size */
1200 /* Check if a packet is "short" as defined by xmin. The rule we are */
1201 /* applying here is that the packet must not be fragmented within the layer */
1202 /* 4 header. That is, it must not be a fragment that has its offset set to */
1203 /* start within the layer 4 header (hdrmin) or if it is at offset 0, the */
1204 /* entire layer 4 header must be present (min). */
1205 /* ------------------------------------------------------------------------ */
1207 ipf_pr_short(fin, xmin)
1212 if (fin->fin_off == 0) {
1213 if (fin->fin_dlen < xmin)
1214 fin->fin_flx |= FI_SHORT;
1215 } else if (fin->fin_off < xmin) {
1216 fin->fin_flx |= FI_SHORT;
1221 /* ------------------------------------------------------------------------ */
1222 /* Function: ipf_pr_icmp */
1224 /* Parameters: fin(I) - pointer to packet information */
1227 /* Do a sanity check on the packet for ICMP (v4). In nearly all cases, */
1228 /* except extrememly bad packets, both type and code will be present. */
1229 /* The expected minimum size of an ICMP packet is very much dependent on */
1230 /* the type of it. */
1232 /* XXX - other ICMP sanity checks? */
1233 /* ------------------------------------------------------------------------ */
1238 ipf_main_softc_t *softc = fin->fin_main_soft;
1239 int minicmpsz = sizeof(struct icmp);
1243 ipf_pr_short(fin, ICMPERR_ICMPHLEN);
1245 if (fin->fin_off != 0) {
1246 LBUMPD(ipf_stats[fin->fin_out], fr_v4_icmp_frag);
1250 if (ipf_pr_pullup(fin, ICMPERR_ICMPHLEN) == -1) {
1251 LBUMPD(ipf_stats[fin->fin_out], fr_v4_icmp_pullup);
1257 fin->fin_data[0] = *(u_short *)icmp;
1258 fin->fin_data[1] = icmp->icmp_id;
1260 switch (icmp->icmp_type)
1262 case ICMP_ECHOREPLY :
1264 /* Router discovery messaes - RFC 1256 */
1265 case ICMP_ROUTERADVERT :
1266 case ICMP_ROUTERSOLICIT :
1267 fin->fin_flx |= FI_ICMPQUERY;
1268 minicmpsz = ICMP_MINLEN;
1271 * type(1) + code(1) + cksum(2) + id(2) seq(2) +
1272 * 3 * timestamp(3 * 4)
1275 case ICMP_TSTAMPREPLY :
1276 fin->fin_flx |= FI_ICMPQUERY;
1280 * type(1) + code(1) + cksum(2) + id(2) seq(2) +
1284 case ICMP_IREQREPLY :
1286 case ICMP_MASKREPLY :
1287 fin->fin_flx |= FI_ICMPQUERY;
1291 * type(1) + code(1) + cksum(2) + id(2) seq(2) + ip(20+)
1295 if (icmp->icmp_code == ICMP_UNREACH_NEEDFRAG) {
1296 if (icmp->icmp_nextmtu < softc->ipf_icmpminfragmtu) {
1297 fin->fin_flx |= FI_BAD;
1298 DT3(ipf_fi_bad_icmp_nextmtu, fr_info_t *, fin, u_int, icmp->icmp_nextmtu, u_int, softc->ipf_icmpminfragmtu);
1302 case ICMP_SOURCEQUENCH :
1303 case ICMP_REDIRECT :
1304 case ICMP_TIMXCEED :
1305 case ICMP_PARAMPROB :
1306 fin->fin_flx |= FI_ICMPERR;
1307 if (ipf_coalesce(fin) != 1) {
1308 LBUMPD(ipf_stats[fin->fin_out], fr_icmp_coalesce);
1313 * ICMP error packets should not be generated for IP
1314 * packets that are a fragment that isn't the first
1317 oip = (ip_t *)((char *)fin->fin_dp + ICMPERR_ICMPHLEN);
1318 if ((ntohs(oip->ip_off) & IP_OFFMASK) != 0) {
1319 fin->fin_flx |= FI_BAD;
1320 DT2(ipf_fi_bad_icmp_err, fr_info_t, fin, u_int, (ntohs(oip->ip_off) & IP_OFFMASK));
1324 * If the destination of this packet doesn't match the
1325 * source of the original packet then this packet is
1328 if (oip->ip_src.s_addr != fin->fin_daddr) {
1329 fin->fin_flx |= FI_BAD;
1330 DT1(ipf_fi_bad_src_ne_dst, fr_info_t *, fin);
1337 ipf_pr_short(fin, minicmpsz);
1339 ipf_checkv4sum(fin);
1343 /* ------------------------------------------------------------------------ */
1344 /* Function: ipf_pr_tcpcommon */
1345 /* Returns: int - 0 = header ok, 1 = bad packet, -1 = buffer error */
1346 /* Parameters: fin(I) - pointer to packet information */
1348 /* TCP header sanity checking. Look for bad combinations of TCP flags, */
1349 /* and make some checks with how they interact with other fields. */
1350 /* If compiled with IPFILTER_CKSUM, check to see if the TCP checksum is */
1351 /* valid and mark the packet as bad if not. */
1352 /* ------------------------------------------------------------------------ */
1354 ipf_pr_tcpcommon(fin)
1357 ipf_main_softc_t *softc = fin->fin_main_soft;
1361 fin->fin_flx |= FI_TCPUDP;
1362 if (fin->fin_off != 0) {
1363 LBUMPD(ipf_stats[fin->fin_out], fr_tcp_frag);
1367 if (ipf_pr_pullup(fin, sizeof(*tcp)) == -1) {
1368 LBUMPD(ipf_stats[fin->fin_out], fr_tcp_pullup);
1373 if (fin->fin_dlen > 3) {
1374 fin->fin_sport = ntohs(tcp->th_sport);
1375 fin->fin_dport = ntohs(tcp->th_dport);
1378 if ((fin->fin_flx & FI_SHORT) != 0) {
1379 LBUMPD(ipf_stats[fin->fin_out], fr_tcp_short);
1384 * Use of the TCP data offset *must* result in a value that is at
1385 * least the same size as the TCP header.
1387 tlen = TCP_OFF(tcp) << 2;
1388 if (tlen < sizeof(tcphdr_t)) {
1389 LBUMPD(ipf_stats[fin->fin_out], fr_tcp_small);
1390 fin->fin_flx |= FI_BAD;
1391 DT3(ipf_fi_bad_tlen, fr_info_t, fin, u_int, tlen, u_int, sizeof(tcphdr_t));
1395 flags = tcp->th_flags;
1396 fin->fin_tcpf = tcp->th_flags;
1399 * If the urgent flag is set, then the urgent pointer must
1400 * also be set and vice versa. Good TCP packets do not have
1401 * just one of these set.
1403 if ((flags & TH_URG) != 0 && (tcp->th_urp == 0)) {
1404 fin->fin_flx |= FI_BAD;
1405 DT3(ipf_fi_bad_th_urg, fr_info_t*, fin, u_int, (flags & TH_URG), u_int, tcp->th_urp);
1407 } else if ((flags & TH_URG) == 0 && (tcp->th_urp != 0)) {
1409 * Ignore this case (#if 0) as it shows up in "real"
1410 * traffic with bogus values in the urgent pointer field.
1412 fin->fin_flx |= FI_BAD;
1413 DT3(ipf_fi_bad_th_urg0, fr_info_t *, fin, u_int, (flags & TH_URG), u_int, tcp->th_urp);
1415 } else if (((flags & (TH_SYN|TH_FIN)) != 0) &&
1416 ((flags & (TH_RST|TH_ACK)) == TH_RST)) {
1417 /* TH_FIN|TH_RST|TH_ACK seems to appear "naturally" */
1418 fin->fin_flx |= FI_BAD;
1419 DT1(ipf_fi_bad_th_fin_rst_ack, fr_info_t, fin);
1421 } else if (((flags & TH_SYN) != 0) &&
1422 ((flags & (TH_URG|TH_PUSH)) != 0)) {
1424 * SYN with URG and PUSH set is not for normal TCP but it is
1425 * possible(?) with T/TCP...but who uses T/TCP?
1427 fin->fin_flx |= FI_BAD;
1428 DT1(ipf_fi_bad_th_syn_urg_psh, fr_info_t *, fin);
1430 } else if (!(flags & TH_ACK)) {
1432 * If the ack bit isn't set, then either the SYN or
1433 * RST bit must be set. If the SYN bit is set, then
1434 * we expect the ACK field to be 0. If the ACK is
1435 * not set and if URG, PSH or FIN are set, consdier
1436 * that to indicate a bad TCP packet.
1438 if ((flags == TH_SYN) && (tcp->th_ack != 0)) {
1440 * Cisco PIX sets the ACK field to a random value.
1441 * In light of this, do not set FI_BAD until a patch
1442 * is available from Cisco to ensure that
1443 * interoperability between existing systems is
1446 /*fin->fin_flx |= FI_BAD*/;
1447 /*DT1(ipf_fi_bad_th_syn_ack, fr_info_t *, fin);*/
1448 } else if (!(flags & (TH_RST|TH_SYN))) {
1449 fin->fin_flx |= FI_BAD;
1450 DT1(ipf_fi_bad_th_rst_syn, fr_info_t *, fin);
1451 } else if ((flags & (TH_URG|TH_PUSH|TH_FIN)) != 0) {
1452 fin->fin_flx |= FI_BAD;
1453 DT1(ipf_fi_bad_th_urg_push_fin, fr_info_t *, fin);
1456 if (fin->fin_flx & FI_BAD) {
1457 LBUMPD(ipf_stats[fin->fin_out], fr_tcp_bad_flags);
1462 * At this point, it's not exactly clear what is to be gained by
1463 * marking up which TCP options are and are not present. The one we
1464 * are most interested in is the TCP window scale. This is only in
1465 * a SYN packet [RFC1323] so we don't need this here...?
1466 * Now if we were to analyse the header for passive fingerprinting,
1467 * then that might add some weight to adding this...
1469 if (tlen == sizeof(tcphdr_t)) {
1473 if (ipf_pr_pullup(fin, tlen) == -1) {
1474 LBUMPD(ipf_stats[fin->fin_out], fr_tcp_pullup);
1481 s = (u_char *)(tcp + 1);
1482 off = IP_HL(ip) << 2;
1484 if (fin->fin_mp != NULL) {
1485 mb_t *m = *fin->fin_mp;
1487 if (off + tlen > M_LEN(m))
1491 for (tlen -= (int)sizeof(*tcp); tlen > 0; ) {
1495 else if (opt == TCPOPT_NOP)
1501 if (ol < 2 || ol > tlen)
1505 for (i = 9, mv = 4; mv >= 0; ) {
1507 if (opt == (u_char)op->ol_val) {
1508 optmsk |= op->ol_bit;
1522 /* ------------------------------------------------------------------------ */
1523 /* Function: ipf_pr_udpcommon */
1524 /* Returns: int - 0 = header ok, 1 = bad packet */
1525 /* Parameters: fin(I) - pointer to packet information */
1527 /* Extract the UDP source and destination ports, if present. If compiled */
1528 /* with IPFILTER_CKSUM, check to see if the UDP checksum is valid. */
1529 /* ------------------------------------------------------------------------ */
1531 ipf_pr_udpcommon(fin)
1536 fin->fin_flx |= FI_TCPUDP;
1538 if (!fin->fin_off && (fin->fin_dlen > 3)) {
1539 if (ipf_pr_pullup(fin, sizeof(*udp)) == -1) {
1540 ipf_main_softc_t *softc = fin->fin_main_soft;
1542 fin->fin_flx |= FI_SHORT;
1543 LBUMPD(ipf_stats[fin->fin_out], fr_udp_pullup);
1549 fin->fin_sport = ntohs(udp->uh_sport);
1550 fin->fin_dport = ntohs(udp->uh_dport);
1557 /* ------------------------------------------------------------------------ */
1558 /* Function: ipf_pr_tcp */
1560 /* Parameters: fin(I) - pointer to packet information */
1563 /* Analyse the packet for IPv4/TCP properties. */
1564 /* ------------------------------------------------------------------------ */
1570 ipf_pr_short(fin, sizeof(tcphdr_t));
1572 if (ipf_pr_tcpcommon(fin) == 0)
1573 ipf_checkv4sum(fin);
1577 /* ------------------------------------------------------------------------ */
1578 /* Function: ipf_pr_udp */
1580 /* Parameters: fin(I) - pointer to packet information */
1583 /* Analyse the packet for IPv4/UDP properties. */
1584 /* ------------------------------------------------------------------------ */
1590 ipf_pr_short(fin, sizeof(udphdr_t));
1592 if (ipf_pr_udpcommon(fin) == 0)
1593 ipf_checkv4sum(fin);
1597 /* ------------------------------------------------------------------------ */
1598 /* Function: ipf_pr_esp */
1600 /* Parameters: fin(I) - pointer to packet information */
1602 /* Analyse the packet for ESP properties. */
1603 /* The minimum length is taken to be the SPI (32bits) plus a tail (32bits) */
1604 /* even though the newer ESP packets must also have a sequence number that */
1605 /* is 32bits as well, it is not possible(?) to determine the version from a */
1606 /* simple packet header. */
1607 /* ------------------------------------------------------------------------ */
1613 if (fin->fin_off == 0) {
1614 ipf_pr_short(fin, 8);
1615 if (ipf_pr_pullup(fin, 8) == -1) {
1616 ipf_main_softc_t *softc = fin->fin_main_soft;
1618 LBUMPD(ipf_stats[fin->fin_out], fr_v4_esp_pullup);
1624 /* ------------------------------------------------------------------------ */
1625 /* Function: ipf_pr_ah */
1626 /* Returns: int - value of the next header or IPPROTO_NONE if error */
1627 /* Parameters: fin(I) - pointer to packet information */
1629 /* Analyse the packet for AH properties. */
1630 /* The minimum length is taken to be the combination of all fields in the */
1631 /* header being present and no authentication data (null algorithm used.) */
1632 /* ------------------------------------------------------------------------ */
1637 ipf_main_softc_t *softc = fin->fin_main_soft;
1641 fin->fin_flx |= FI_AH;
1642 ipf_pr_short(fin, sizeof(*ah));
1644 if (((fin->fin_flx & FI_SHORT) != 0) || (fin->fin_off != 0)) {
1645 LBUMPD(ipf_stats[fin->fin_out], fr_v4_ah_bad);
1646 return IPPROTO_NONE;
1649 if (ipf_pr_pullup(fin, sizeof(*ah)) == -1) {
1650 DT(fr_v4_ah_pullup_1);
1651 LBUMP(ipf_stats[fin->fin_out].fr_v4_ah_pullup);
1652 return IPPROTO_NONE;
1655 ah = (authhdr_t *)fin->fin_dp;
1657 len = (ah->ah_plen + 2) << 2;
1658 ipf_pr_short(fin, len);
1659 if (ipf_pr_pullup(fin, len) == -1) {
1660 DT(fr_v4_ah_pullup_2);
1661 LBUMP(ipf_stats[fin->fin_out].fr_v4_ah_pullup);
1662 return IPPROTO_NONE;
1666 * Adjust fin_dp and fin_dlen for skipping over the authentication
1669 fin->fin_dp = (char *)fin->fin_dp + len;
1670 fin->fin_dlen -= len;
1675 /* ------------------------------------------------------------------------ */
1676 /* Function: ipf_pr_gre */
1678 /* Parameters: fin(I) - pointer to packet information */
1680 /* Analyse the packet for GRE properties. */
1681 /* ------------------------------------------------------------------------ */
1686 ipf_main_softc_t *softc = fin->fin_main_soft;
1689 ipf_pr_short(fin, sizeof(grehdr_t));
1691 if (fin->fin_off != 0) {
1692 LBUMPD(ipf_stats[fin->fin_out], fr_v4_gre_frag);
1696 if (ipf_pr_pullup(fin, sizeof(grehdr_t)) == -1) {
1697 LBUMPD(ipf_stats[fin->fin_out], fr_v4_gre_pullup);
1702 if (GRE_REV(gre->gr_flags) == 1)
1703 fin->fin_data[0] = gre->gr_call;
1707 /* ------------------------------------------------------------------------ */
1708 /* Function: ipf_pr_ipv4hdr */
1710 /* Parameters: fin(I) - pointer to packet information */
1713 /* Analyze the IPv4 header and set fields in the fr_info_t structure. */
1714 /* Check all options present and flag their presence if any exist. */
1715 /* ------------------------------------------------------------------------ */
1720 u_short optmsk = 0, secmsk = 0, auth = 0;
1721 int hlen, ol, mv, p, i;
1722 const struct optlist *op;
1729 hlen = fin->fin_hlen;
1735 fi->fi_tos = ip->ip_tos;
1736 fin->fin_id = ip->ip_id;
1737 off = ntohs(ip->ip_off);
1739 /* Get both TTL and protocol */
1740 fi->fi_p = ip->ip_p;
1741 fi->fi_ttl = ip->ip_ttl;
1743 /* Zero out bits not used in IPv6 address */
1744 fi->fi_src.i6[1] = 0;
1745 fi->fi_src.i6[2] = 0;
1746 fi->fi_src.i6[3] = 0;
1747 fi->fi_dst.i6[1] = 0;
1748 fi->fi_dst.i6[2] = 0;
1749 fi->fi_dst.i6[3] = 0;
1751 fi->fi_saddr = ip->ip_src.s_addr;
1752 fin->fin_crc += fi->fi_saddr;
1753 fi->fi_daddr = ip->ip_dst.s_addr;
1754 fin->fin_crc += fi->fi_daddr;
1755 if (IN_CLASSD(ntohl(fi->fi_daddr)))
1756 fin->fin_flx |= FI_MULTICAST|FI_MBCAST;
1759 * set packet attribute flags based on the offset and
1760 * calculate the byte offset that it represents.
1762 off &= IP_MF|IP_OFFMASK;
1764 int morefrag = off & IP_MF;
1766 fi->fi_flx |= FI_FRAG;
1769 fin->fin_flx |= FI_FRAGBODY;
1771 if ((off + fin->fin_dlen > 65535) ||
1772 (fin->fin_dlen == 0) ||
1773 ((morefrag != 0) && ((fin->fin_dlen & 7) != 0))) {
1775 * The length of the packet, starting at its
1776 * offset cannot exceed 65535 (0xffff) as the
1777 * length of an IP packet is only 16 bits.
1779 * Any fragment that isn't the last fragment
1780 * must have a length greater than 0 and it
1781 * must be an even multiple of 8.
1783 fi->fi_flx |= FI_BAD;
1784 DT1(ipf_fi_bad_fragbody_gt_65535, fr_info_t *, fin);
1791 * Call per-protocol setup and checking
1793 if (p == IPPROTO_AH) {
1795 * Treat AH differently because we expect there to be another
1796 * layer 4 header after it.
1825 * If it is a standard IP header (no options), set the flag fields
1826 * which relate to options to 0.
1828 if (hlen == sizeof(*ip)) {
1836 * So the IP header has some IP options attached. Walk the entire
1837 * list of options present with this packet and set flags to indicate
1838 * which ones are here and which ones are not. For the somewhat out
1839 * of date and obscure security classification options, set a flag to
1840 * represent which classification is present.
1842 fi->fi_flx |= FI_OPTIONS;
1844 for (s = (u_char *)(ip + 1), hlen -= (int)sizeof(*ip); hlen > 0; ) {
1848 else if (opt == IPOPT_NOP)
1854 if (ol < 2 || ol > hlen)
1857 for (i = 9, mv = 4; mv >= 0; ) {
1860 if ((opt == (u_char)op->ol_val) && (ol > 4)) {
1865 case IPOPT_SECURITY :
1866 if (optmsk & op->ol_bit) {
1867 fin->fin_flx |= FI_BAD;
1868 DT2(ipf_fi_bad_ipopt_security, fr_info_t *, fin, u_short, (optmsk & op->ol_bit));
1870 doi = ipf_checkripso(s);
1872 auth = doi & 0xffff;
1878 if (optmsk & op->ol_bit) {
1879 fin->fin_flx |= FI_BAD;
1880 DT2(ipf_fi_bad_ipopt_cipso, fr_info_t *, fin, u_short, (optmsk & op->ol_bit));
1882 doi = ipf_checkcipso(fin,
1885 auth = doi & 0xffff;
1889 optmsk |= op->ol_bit;
1892 if (opt < op->ol_val)
1905 if (auth && !(auth & 0x0100))
1907 fi->fi_optmsk = optmsk;
1908 fi->fi_secmsk = secmsk;
1913 /* ------------------------------------------------------------------------ */
1914 /* Function: ipf_checkripso */
1916 /* Parameters: s(I) - pointer to start of RIPSO option */
1918 /* ------------------------------------------------------------------------ */
1923 const struct optlist *sp;
1924 u_short secmsk = 0, auth = 0;
1928 sec = *(s + 2); /* classification */
1929 for (j = 3, m = 2; m >= 0; ) {
1931 if (sec == sp->ol_val) {
1932 secmsk |= sp->ol_bit;
1938 if (sec < sp->ol_val)
1945 return (secmsk << 16) | auth;
1949 /* ------------------------------------------------------------------------ */
1950 /* Function: ipf_checkcipso */
1951 /* Returns: u_32_t - 0 = failure, else the doi from the header */
1952 /* Parameters: fin(IO) - pointer to packet information */
1953 /* s(I) - pointer to start of CIPSO option */
1954 /* ol(I) - length of CIPSO option field */
1956 /* This function returns the domain of integrity (DOI) field from the CIPSO */
1957 /* header and returns that whilst also storing the highest sensitivity */
1958 /* value found in the fr_info_t structure. */
1960 /* No attempt is made to extract the category bitmaps as these are defined */
1961 /* by the user (rather than the protocol) and can be rather numerous on the */
1963 /* ------------------------------------------------------------------------ */
1965 ipf_checkcipso(fin, s, ol)
1970 ipf_main_softc_t *softc = fin->fin_main_soft;
1973 u_char *t, tag, tlen, sensitivity;
1976 if (ol < 6 || ol > 40) {
1977 LBUMPD(ipf_stats[fin->fin_out], fr_v4_cipso_bad);
1978 fin->fin_flx |= FI_BAD;
1979 DT2(ipf_fi_bad_checkcipso_ol, fr_info_t *, fin, u_int, ol);
1984 fi->fi_sensitivity = 0;
1986 * The DOI field MUST be there.
1988 bcopy(s + 2, &doi, sizeof(doi));
1990 t = (u_char *)s + 6;
1991 for (len = ol - 6; len >= 2; len -= tlen, t+= tlen) {
1994 if (tlen > len || tlen < 4 || tlen > 34) {
1995 LBUMPD(ipf_stats[fin->fin_out], fr_v4_cipso_tlen);
1996 fin->fin_flx |= FI_BAD;
1997 DT2(ipf_fi_bad_checkcipso_tlen, fr_info_t *, fin, u_int, tlen);
2003 * Tag numbers 0, 1, 2, 5 are laid out in the CIPSO Internet
2004 * draft (16 July 1992) that has expired.
2007 fin->fin_flx |= FI_BAD;
2008 DT2(ipf_fi_bad_checkcipso_tag, fr_info_t *, fin, u_int, tag);
2010 } else if (tag == 1) {
2011 if (*(t + 2) != 0) {
2012 fin->fin_flx |= FI_BAD;
2013 DT2(ipf_fi_bad_checkcipso_tag1_t2, fr_info_t *, fin, u_int, (*t + 2));
2016 sensitivity = *(t + 3);
2017 /* Category bitmap for categories 0-239 */
2019 } else if (tag == 4) {
2020 if (*(t + 2) != 0) {
2021 fin->fin_flx |= FI_BAD;
2022 DT2(ipf_fi_bad_checkcipso_tag4_t2, fr_info_t *, fin, u_int, (*t + 2));
2025 sensitivity = *(t + 3);
2026 /* Enumerated categories, 16bits each, upto 15 */
2028 } else if (tag == 5) {
2029 if (*(t + 2) != 0) {
2030 fin->fin_flx |= FI_BAD;
2031 DT2(ipf_fi_bad_checkcipso_tag5_t2, fr_info_t *, fin, u_int, (*t + 2));
2034 sensitivity = *(t + 3);
2035 /* Range of categories (2*16bits), up to 7 pairs */
2037 } else if (tag > 127) {
2038 /* Custom defined DOI */
2041 fin->fin_flx |= FI_BAD;
2042 DT2(ipf_fi_bad_checkcipso_tag127, fr_info_t *, fin, u_int, tag);
2046 if (sensitivity > fi->fi_sensitivity)
2047 fi->fi_sensitivity = sensitivity;
2054 /* ------------------------------------------------------------------------ */
2055 /* Function: ipf_makefrip */
2056 /* Returns: int - 0 == packet ok, -1 == packet freed */
2057 /* Parameters: hlen(I) - length of IP packet header */
2058 /* ip(I) - pointer to the IP header */
2059 /* fin(IO) - pointer to packet information */
2061 /* Compact the IP header into a structure which contains just the info. */
2062 /* which is useful for comparing IP headers with and store this information */
2063 /* in the fr_info_t structure pointer to by fin. At present, it is assumed */
2064 /* this function will be called with either an IPv4 or IPv6 packet. */
2065 /* ------------------------------------------------------------------------ */
2067 ipf_makefrip(hlen, ip, fin)
2072 ipf_main_softc_t *softc = fin->fin_main_soft;
2076 fin->fin_hlen = (u_short)hlen;
2078 fin->fin_rule = 0xffffffff;
2079 fin->fin_group[0] = -1;
2080 fin->fin_group[1] = '\0';
2081 fin->fin_dp = (char *)ip + hlen;
2085 fin->fin_plen = ntohs(ip->ip_len);
2086 fin->fin_dlen = fin->fin_plen - hlen;
2087 ipf_pr_ipv4hdr(fin);
2089 } else if (v == 6) {
2090 fin->fin_plen = ntohs(((ip6_t *)ip)->ip6_plen);
2091 fin->fin_dlen = fin->fin_plen;
2092 fin->fin_plen += hlen;
2094 ipf_pr_ipv6hdr(fin);
2097 if (fin->fin_ip == NULL) {
2098 LBUMP(ipf_stats[fin->fin_out].fr_ip_freed);
2105 /* ------------------------------------------------------------------------ */
2106 /* Function: ipf_portcheck */
2107 /* Returns: int - 1 == port matched, 0 == port match failed */
2108 /* Parameters: frp(I) - pointer to port check `expression' */
2109 /* pop(I) - port number to evaluate */
2111 /* Perform a comparison of a port number against some other(s), using a */
2112 /* structure with compare information stored in it. */
2113 /* ------------------------------------------------------------------------ */
2115 ipf_portcheck(frp, pop)
2125 * Do opposite test to that required and continue if that succeeds.
2127 switch (frp->frp_cmp)
2130 if (pop != po) /* EQUAL */
2134 if (pop == po) /* NOTEQUAL */
2138 if (pop >= po) /* LESSTHAN */
2142 if (pop <= po) /* GREATERTHAN */
2146 if (pop > po) /* LT or EQ */
2150 if (pop < po) /* GT or EQ */
2154 if (pop >= po && pop <= frp->frp_top) /* Out of range */
2158 if (pop <= po || pop >= frp->frp_top) /* In range */
2162 if (pop < po || pop > frp->frp_top) /* Inclusive range */
2172 /* ------------------------------------------------------------------------ */
2173 /* Function: ipf_tcpudpchk */
2174 /* Returns: int - 1 == protocol matched, 0 == check failed */
2175 /* Parameters: fda(I) - pointer to packet information */
2176 /* ft(I) - pointer to structure with comparison data */
2178 /* Compares the current pcket (assuming it is TCP/UDP) information with a */
2179 /* structure containing information that we want to match against. */
2180 /* ------------------------------------------------------------------------ */
2182 ipf_tcpudpchk(fi, ft)
2189 * Both ports should *always* be in the first fragment.
2190 * So far, I cannot find any cases where they can not be.
2192 * compare destination ports
2195 err = ipf_portcheck(&ft->ftu_dst, fi->fi_ports[1]);
2198 * compare source ports
2200 if (err && ft->ftu_scmp)
2201 err = ipf_portcheck(&ft->ftu_src, fi->fi_ports[0]);
2204 * If we don't have all the TCP/UDP header, then how can we
2205 * expect to do any sort of match on it ? If we were looking for
2206 * TCP flags, then NO match. If not, then match (which should
2207 * satisfy the "short" class too).
2209 if (err && (fi->fi_p == IPPROTO_TCP)) {
2210 if (fi->fi_flx & FI_SHORT)
2211 return !(ft->ftu_tcpf | ft->ftu_tcpfm);
2213 * Match the flags ? If not, abort this match.
2215 if (ft->ftu_tcpfm &&
2216 ft->ftu_tcpf != (fi->fi_tcpf & ft->ftu_tcpfm)) {
2217 FR_DEBUG(("f. %#x & %#x != %#x\n", fi->fi_tcpf,
2218 ft->ftu_tcpfm, ft->ftu_tcpf));
2226 /* ------------------------------------------------------------------------ */
2227 /* Function: ipf_check_ipf */
2228 /* Returns: int - 0 == match, else no match */
2229 /* Parameters: fin(I) - pointer to packet information */
2230 /* fr(I) - pointer to filter rule */
2231 /* portcmp(I) - flag indicating whether to attempt matching on */
2232 /* TCP/UDP port data. */
2234 /* Check to see if a packet matches an IPFilter rule. Checks of addresses, */
2235 /* port numbers, etc, for "standard" IPFilter rules are all orchestrated in */
2236 /* this function. */
2237 /* ------------------------------------------------------------------------ */
2239 ipf_check_ipf(fin, fr, portcmp)
2244 u_32_t *ld, *lm, *lip;
2252 lm = (u_32_t *)&fri->fri_mip;
2253 ld = (u_32_t *)&fri->fri_ip;
2256 * first 32 bits to check coversion:
2257 * IP version, TOS, TTL, protocol
2259 i = ((*lip & *lm) != *ld);
2260 FR_DEBUG(("0. %#08x & %#08x != %#08x\n",
2261 ntohl(*lip), ntohl(*lm), ntohl(*ld)));
2266 * Next 32 bits is a constructed bitmask indicating which IP options
2267 * are present (if any) in this packet.
2270 i = ((*lip & *lm) != *ld);
2271 FR_DEBUG(("1. %#08x & %#08x != %#08x\n",
2272 ntohl(*lip), ntohl(*lm), ntohl(*ld)));
2278 * Unrolled loops (4 each, for 32 bits) for address checks.
2281 * Check the source address.
2283 if (fr->fr_satype == FRI_LOOKUP) {
2284 i = (*fr->fr_srcfunc)(fin->fin_main_soft, fr->fr_srcptr,
2285 fi->fi_v, lip, fin->fin_plen);
2292 i = ((*lip & *lm) != *ld);
2293 FR_DEBUG(("2a. %#08x & %#08x != %#08x\n",
2294 ntohl(*lip), ntohl(*lm), ntohl(*ld)));
2295 if (fi->fi_v == 6) {
2297 i |= ((*lip & *lm) != *ld);
2298 FR_DEBUG(("2b. %#08x & %#08x != %#08x\n",
2299 ntohl(*lip), ntohl(*lm), ntohl(*ld)));
2301 i |= ((*lip & *lm) != *ld);
2302 FR_DEBUG(("2c. %#08x & %#08x != %#08x\n",
2303 ntohl(*lip), ntohl(*lm), ntohl(*ld)));
2305 i |= ((*lip & *lm) != *ld);
2306 FR_DEBUG(("2d. %#08x & %#08x != %#08x\n",
2307 ntohl(*lip), ntohl(*lm), ntohl(*ld)));
2314 i ^= (fr->fr_flags & FR_NOTSRCIP) >> 6;
2319 * Check the destination address.
2322 if (fr->fr_datype == FRI_LOOKUP) {
2323 i = (*fr->fr_dstfunc)(fin->fin_main_soft, fr->fr_dstptr,
2324 fi->fi_v, lip, fin->fin_plen);
2331 i = ((*lip & *lm) != *ld);
2332 FR_DEBUG(("3a. %#08x & %#08x != %#08x\n",
2333 ntohl(*lip), ntohl(*lm), ntohl(*ld)));
2334 if (fi->fi_v == 6) {
2336 i |= ((*lip & *lm) != *ld);
2337 FR_DEBUG(("3b. %#08x & %#08x != %#08x\n",
2338 ntohl(*lip), ntohl(*lm), ntohl(*ld)));
2340 i |= ((*lip & *lm) != *ld);
2341 FR_DEBUG(("3c. %#08x & %#08x != %#08x\n",
2342 ntohl(*lip), ntohl(*lm), ntohl(*ld)));
2344 i |= ((*lip & *lm) != *ld);
2345 FR_DEBUG(("3d. %#08x & %#08x != %#08x\n",
2346 ntohl(*lip), ntohl(*lm), ntohl(*ld)));
2353 i ^= (fr->fr_flags & FR_NOTDSTIP) >> 7;
2357 * IP addresses matched. The next 32bits contains:
2358 * mast of old IP header security & authentication bits.
2361 i = (*ld - (*lip & *lm));
2362 FR_DEBUG(("4. %#08x & %#08x != %#08x\n", *lip, *lm, *ld));
2365 * Next we have 32 bits of packet flags.
2368 i |= (*ld - (*lip & *lm));
2369 FR_DEBUG(("5. %#08x & %#08x != %#08x\n", *lip, *lm, *ld));
2373 * If a fragment, then only the first has what we're
2374 * looking for here...
2377 if (!ipf_tcpudpchk(&fin->fin_fi, &fr->fr_tuc))
2380 if (fr->fr_dcmp || fr->fr_scmp ||
2381 fr->fr_tcpf || fr->fr_tcpfm)
2383 if (fr->fr_icmpm || fr->fr_icmp) {
2384 if (((fi->fi_p != IPPROTO_ICMP) &&
2385 (fi->fi_p != IPPROTO_ICMPV6)) ||
2386 fin->fin_off || (fin->fin_dlen < 2))
2388 else if ((fin->fin_data[0] & fr->fr_icmpm) !=
2390 FR_DEBUG(("i. %#x & %#x != %#x\n",
2392 fr->fr_icmpm, fr->fr_icmp));
2402 /* ------------------------------------------------------------------------ */
2403 /* Function: ipf_scanlist */
2404 /* Returns: int - result flags of scanning filter list */
2405 /* Parameters: fin(I) - pointer to packet information */
2406 /* pass(I) - default result to return for filtering */
2408 /* Check the input/output list of rules for a match to the current packet. */
2409 /* If a match is found, the value of fr_flags from the rule becomes the */
2410 /* return value and fin->fin_fr points to the matched rule. */
2412 /* This function may be called recusively upto 16 times (limit inbuilt.) */
2413 /* When unwinding, it should finish up with fin_depth as 0. */
2415 /* Could be per interface, but this gets real nasty when you don't have, */
2416 /* or can't easily change, the kernel source code to . */
2417 /* ------------------------------------------------------------------------ */
2419 ipf_scanlist(fin, pass)
2423 ipf_main_softc_t *softc = fin->fin_main_soft;
2424 int rulen, portcmp, off, skip;
2425 struct frentry *fr, *fnext;
2426 u_32_t passt, passo;
2429 * Do not allow nesting deeper than 16 levels.
2431 if (fin->fin_depth >= 16)
2437 * If there are no rules in this list, return now.
2448 if ((fin->fin_flx & FI_TCPUDP) && (fin->fin_dlen > 3) && !off)
2451 for (rulen = 0; fr; fr = fnext, rulen++) {
2452 fnext = fr->fr_next;
2454 FR_VERBOSE(("SKIP %d (%#x)\n", skip, fr->fr_flags));
2460 * In all checks below, a null (zero) value in the
2461 * filter struture is taken to mean a wildcard.
2463 * check that we are working for the right interface
2466 if (fr->fr_ifa && fr->fr_ifa != fin->fin_ifp)
2469 if (opts & (OPT_VERBOSE|OPT_DEBUG))
2471 FR_VERBOSE(("%c", FR_ISSKIP(pass) ? 's' :
2472 FR_ISPASS(pass) ? 'p' :
2473 FR_ISACCOUNT(pass) ? 'A' :
2474 FR_ISAUTH(pass) ? 'a' :
2475 (pass & FR_NOMATCH) ? 'n' :'b'));
2476 if (fr->fr_ifa && fr->fr_ifa != fin->fin_ifp)
2481 switch (fr->fr_type)
2484 case FR_T_IPF_BUILTIN :
2485 if (ipf_check_ipf(fin, fr, portcmp))
2488 #if defined(IPFILTER_BPF)
2490 case FR_T_BPFOPC_BUILTIN :
2495 if (*fin->fin_mp == NULL)
2497 if (fin->fin_family != fr->fr_family)
2499 mc = (u_char *)fin->fin_m;
2500 wlen = fin->fin_dlen + fin->fin_hlen;
2501 if (!bpf_filter(fr->fr_data, mc, wlen, 0))
2506 case FR_T_CALLFUNC_BUILTIN :
2510 f = (*fr->fr_func)(fin, &pass);
2519 case FR_T_IPFEXPR_BUILTIN :
2520 if (fin->fin_family != fr->fr_family)
2522 if (ipf_fr_matcharray(fin, fr->fr_data) == 0)
2530 if ((fin->fin_out == 0) && (fr->fr_nattag.ipt_num[0] != 0)) {
2531 if (fin->fin_nattag == NULL)
2533 if (ipf_matchtag(&fr->fr_nattag, fin->fin_nattag) == 0)
2536 FR_VERBOSE(("=%d/%d.%d *", fr->fr_grhead, fr->fr_group, rulen));
2538 passt = fr->fr_flags;
2541 * If the rule is a "call now" rule, then call the function
2542 * in the rule, if it exists and use the results from that.
2543 * If the function pointer is bad, just make like we ignore
2544 * it, except for increasing the hit counter.
2546 if ((passt & FR_CALLNOW) != 0) {
2549 ATOMIC_INC64(fr->fr_hits);
2550 if ((fr->fr_func == NULL) ||
2551 (fr->fr_func == (ipfunc_t)-1))
2556 fr = (*fr->fr_func)(fin, &passt);
2561 passt = fr->fr_flags;
2567 * Just log this packet...
2569 if ((passt & FR_LOGMASK) == FR_LOG) {
2570 if (ipf_log_pkt(fin, passt) == -1) {
2571 if (passt & FR_LOGORBLOCK) {
2573 passt &= ~FR_CMDMASK;
2574 passt |= FR_BLOCK|FR_QUICK;
2575 fin->fin_reason = FRB_LOGFAIL;
2579 #endif /* IPFILTER_LOG */
2581 MUTEX_ENTER(&fr->fr_lock);
2582 fr->fr_bytes += (U_QUAD_T)fin->fin_plen;
2584 MUTEX_EXIT(&fr->fr_lock);
2585 fin->fin_rule = rulen;
2588 if (FR_ISSKIP(passt)) {
2591 } else if (((passt & FR_LOGMASK) != FR_LOG) &&
2592 ((passt & FR_LOGMASK) != FR_DECAPSULATE)) {
2596 if (passt & (FR_RETICMP|FR_FAKEICMP))
2597 fin->fin_icode = fr->fr_icode;
2599 if (fr->fr_group != -1) {
2600 (void) strncpy(fin->fin_group,
2601 FR_NAME(fr, fr_group),
2602 strlen(FR_NAME(fr, fr_group)));
2604 fin->fin_group[0] = '\0';
2607 FR_DEBUG(("pass %#x/%#x/%x\n", passo, pass, passt));
2609 if (fr->fr_grphead != NULL) {
2610 fin->fin_fr = fr->fr_grphead->fg_start;
2611 FR_VERBOSE(("group %s\n", FR_NAME(fr, fr_grhead)));
2613 if (FR_ISDECAPS(passt))
2614 passt = ipf_decaps(fin, pass, fr->fr_icode);
2616 passt = ipf_scanlist(fin, pass);
2618 if (fin->fin_fr == NULL) {
2619 fin->fin_rule = rulen;
2620 if (fr->fr_group != -1)
2621 (void) strncpy(fin->fin_group,
2624 strlen(fr->fr_names +
2632 if (pass & FR_QUICK) {
2634 * Finally, if we've asked to track state for this
2635 * packet, set it up. Add state for "quick" rules
2636 * here so that if the action fails we can consider
2637 * the rule to "not match" and keep on processing
2640 if ((pass & FR_KEEPSTATE) && !FR_ISAUTH(pass) &&
2641 !(fin->fin_flx & FI_STATE)) {
2642 int out = fin->fin_out;
2645 if (ipf_state_add(softc, fin, NULL, 0) == 0) {
2646 LBUMPD(ipf_stats[out], fr_ads);
2648 LBUMPD(ipf_stats[out], fr_bads);
2661 /* ------------------------------------------------------------------------ */
2662 /* Function: ipf_acctpkt */
2663 /* Returns: frentry_t* - always returns NULL */
2664 /* Parameters: fin(I) - pointer to packet information */
2665 /* passp(IO) - pointer to current/new filter decision (unused) */
2667 /* Checks a packet against accounting rules, if there are any for the given */
2668 /* IP protocol version. */
2670 /* N.B.: this function returns NULL to match the prototype used by other */
2671 /* functions called from the IPFilter "mainline" in ipf_check(). */
2672 /* ------------------------------------------------------------------------ */
2674 ipf_acctpkt(fin, passp)
2678 ipf_main_softc_t *softc = fin->fin_main_soft;
2679 char group[FR_GROUPLEN];
2680 frentry_t *fr, *frsave;
2684 fr = softc->ipf_acct[fin->fin_out][softc->ipf_active];
2687 frsave = fin->fin_fr;
2688 bcopy(fin->fin_group, group, FR_GROUPLEN);
2689 rulen = fin->fin_rule;
2691 pass = ipf_scanlist(fin, FR_NOMATCH);
2692 if (FR_ISACCOUNT(pass)) {
2693 LBUMPD(ipf_stats[0], fr_acct);
2695 fin->fin_fr = frsave;
2696 bcopy(group, fin->fin_group, FR_GROUPLEN);
2697 fin->fin_rule = rulen;
2703 /* ------------------------------------------------------------------------ */
2704 /* Function: ipf_firewall */
2705 /* Returns: frentry_t* - returns pointer to matched rule, if no matches */
2706 /* were found, returns NULL. */
2707 /* Parameters: fin(I) - pointer to packet information */
2708 /* passp(IO) - pointer to current/new filter decision (unused) */
2710 /* Applies an appropriate set of firewall rules to the packet, to see if */
2711 /* there are any matches. The first check is to see if a match can be seen */
2712 /* in the cache. If not, then search an appropriate list of rules. Once a */
2713 /* matching rule is found, take any appropriate actions as defined by the */
2714 /* rule - except logging. */
2715 /* ------------------------------------------------------------------------ */
2717 ipf_firewall(fin, passp)
2721 ipf_main_softc_t *softc = fin->fin_main_soft;
2730 * This rule cache will only affect packets that are not being
2731 * statefully filtered.
2733 fin->fin_fr = softc->ipf_rules[out][softc->ipf_active];
2734 if (fin->fin_fr != NULL)
2735 pass = ipf_scanlist(fin, softc->ipf_pass);
2737 if ((pass & FR_NOMATCH)) {
2738 LBUMPD(ipf_stats[out], fr_nom);
2743 * Apply packets per second rate-limiting to a rule as required.
2745 if ((fr != NULL) && (fr->fr_pps != 0) &&
2746 !ppsratecheck(&fr->fr_lastpkt, &fr->fr_curpps, fr->fr_pps)) {
2747 DT2(frb_ppsrate, fr_info_t *, fin, frentry_t *, fr);
2748 pass &= ~(FR_CMDMASK|FR_RETICMP|FR_RETRST);
2750 LBUMPD(ipf_stats[out], fr_ppshit);
2751 fin->fin_reason = FRB_PPSRATE;
2755 * If we fail to add a packet to the authorization queue, then we
2756 * drop the packet later. However, if it was added then pretend
2757 * we've dropped it already.
2759 if (FR_ISAUTH(pass)) {
2760 if (ipf_auth_new(fin->fin_m, fin) != 0) {
2761 DT1(frb_authnew, fr_info_t *, fin);
2762 fin->fin_m = *fin->fin_mp = NULL;
2763 fin->fin_reason = FRB_AUTHNEW;
2767 fin->fin_error = ENOSPC;
2771 if ((fr != NULL) && (fr->fr_func != NULL) &&
2772 (fr->fr_func != (ipfunc_t)-1) && !(pass & FR_CALLNOW))
2773 (void) (*fr->fr_func)(fin, &pass);
2776 * If a rule is a pre-auth rule, check again in the list of rules
2777 * loaded for authenticated use. It does not particulary matter
2778 * if this search fails because a "preauth" result, from a rule,
2779 * is treated as "not a pass", hence the packet is blocked.
2781 if (FR_ISPREAUTH(pass)) {
2782 pass = ipf_auth_pre_scanlist(softc, fin, pass);
2786 * If the rule has "keep frag" and the packet is actually a fragment,
2787 * then create a fragment state entry.
2789 if ((pass & (FR_KEEPFRAG|FR_KEEPSTATE)) == FR_KEEPFRAG) {
2790 if (fin->fin_flx & FI_FRAG) {
2791 if (ipf_frag_new(softc, fin, pass) == -1) {
2792 LBUMP(ipf_stats[out].fr_bnfr);
2794 LBUMP(ipf_stats[out].fr_nfr);
2797 LBUMP(ipf_stats[out].fr_cfr);
2808 /* ------------------------------------------------------------------------ */
2809 /* Function: ipf_check */
2810 /* Returns: int - 0 == packet allowed through, */
2812 /* -1 == packet blocked */
2813 /* 1 == packet not matched */
2814 /* -2 == requires authentication */
2816 /* > 0 == filter error # for packet */
2817 /* Parameters: ip(I) - pointer to start of IPv4/6 packet */
2818 /* hlen(I) - length of header */
2819 /* ifp(I) - pointer to interface this packet is on */
2820 /* out(I) - 0 == packet going in, 1 == packet going out */
2821 /* mp(IO) - pointer to caller's buffer pointer that holds this */
2823 /* Solaris & HP-UX ONLY : */
2824 /* qpi(I) - pointer to STREAMS queue information for this */
2825 /* interface & direction. */
2827 /* ipf_check() is the master function for all IPFilter packet processing. */
2828 /* It orchestrates: Network Address Translation (NAT), checking for packet */
2829 /* authorisation (or pre-authorisation), presence of related state info., */
2830 /* generating log entries, IP packet accounting, routing of packets as */
2831 /* directed by firewall rules and of course whether or not to allow the */
2832 /* packet to be further processed by the kernel. */
2834 /* For packets blocked, the contents of "mp" will be NULL'd and the buffer */
2835 /* freed. Packets passed may be returned with the pointer pointed to by */
2836 /* by "mp" changed to a new buffer. */
2837 /* ------------------------------------------------------------------------ */
2839 ipf_check(ctx, ip, hlen, ifp, out
2840 #if defined(_KERNEL) && defined(MENTAT)
2854 * The above really sucks, but short of writing a diff
2856 ipf_main_softc_t *softc = ctx;
2858 fr_info_t *fin = &frinfo;
2859 u_32_t pass = softc->ipf_pass;
2860 frentry_t *fr = NULL;
2865 * The first part of ipf_check() deals with making sure that what goes
2866 * into the filtering engine makes some sense. Information about the
2867 * the packet is distilled, collected into a fr_info_t structure and
2868 * the an attempt to ensure the buffer the packet is in is big enough
2869 * to hold all the required packet headers.
2873 qpktinfo_t *qpi = qif;
2876 if ((u_int)ip & 0x3)
2883 if (softc->ipf_running <= 0) {
2887 bzero((char *)fin, sizeof(*fin));
2890 if (qpi->qpi_flags & QF_BROADCAST)
2891 fin->fin_flx |= FI_MBCAST|FI_BROADCAST;
2892 if (qpi->qpi_flags & QF_MULTICAST)
2893 fin->fin_flx |= FI_MBCAST|FI_MULTICAST;
2901 # if defined(M_MCAST)
2902 if ((m->m_flags & M_MCAST) != 0)
2903 fin->fin_flx |= FI_MBCAST|FI_MULTICAST;
2905 # if defined(M_MLOOP)
2906 if ((m->m_flags & M_MLOOP) != 0)
2907 fin->fin_flx |= FI_MBCAST|FI_MULTICAST;
2909 # if defined(M_BCAST)
2910 if ((m->m_flags & M_BCAST) != 0)
2911 fin->fin_flx |= FI_MBCAST|FI_BROADCAST;
2913 # ifdef M_CANFASTFWD
2915 * XXX For now, IP Filter and fast-forwarding of cached flows
2916 * XXX are mutually exclusive. Eventually, IP Filter should
2917 * XXX get a "can-fast-forward" filter rule.
2919 m->m_flags &= ~M_CANFASTFWD;
2920 # endif /* M_CANFASTFWD */
2921 # if defined(CSUM_DELAY_DATA) && (!defined(__FreeBSD_version) || \
2922 (__FreeBSD_version < 501108))
2924 * disable delayed checksums.
2926 if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
2927 in_delayed_cksum(m);
2928 m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
2930 # endif /* CSUM_DELAY_DATA */
2931 # endif /* MENTAT */
2933 bzero((char *)fin, sizeof(*fin));
2935 # if defined(M_MCAST)
2936 if ((m->m_flags & M_MCAST) != 0)
2937 fin->fin_flx |= FI_MBCAST|FI_MULTICAST;
2939 # if defined(M_MLOOP)
2940 if ((m->m_flags & M_MLOOP) != 0)
2941 fin->fin_flx |= FI_MBCAST|FI_MULTICAST;
2943 # if defined(M_BCAST)
2944 if ((m->m_flags & M_BCAST) != 0)
2945 fin->fin_flx |= FI_MBCAST|FI_BROADCAST;
2947 #endif /* _KERNEL */
2955 fin->fin_error = ENETUNREACH;
2956 fin->fin_hlen = (u_short)hlen;
2957 fin->fin_dp = (char *)ip + hlen;
2958 fin->fin_main_soft = softc;
2960 fin->fin_ipoff = (char *)ip - MTOD(m, char *);
2966 LBUMP(ipf_stats[out].fr_ipv6);
2968 * Jumbo grams are quite likely too big for internal buffer
2969 * structures to handle comfortably, for now, so just drop
2972 if (((ip6_t *)ip)->ip6_plen == 0) {
2973 DT1(frb_jumbo, ip6_t *, (ip6_t *)ip);
2974 pass = FR_BLOCK|FR_NOMATCH;
2975 fin->fin_reason = FRB_JUMBO;
2978 fin->fin_family = AF_INET6;
2982 fin->fin_family = AF_INET;
2985 if (ipf_makefrip(hlen, ip, fin) == -1) {
2986 DT1(frb_makefrip, fr_info_t *, fin);
2987 pass = FR_BLOCK|FR_NOMATCH;
2988 fin->fin_reason = FRB_MAKEFRIP;
2993 * For at least IPv6 packets, if a m_pullup() fails then this pointer
2994 * becomes NULL and so we have no packet to free.
2996 if (*fin->fin_mp == NULL)
3001 if (softc->ipf_chksrc && !ipf_verifysrc(fin)) {
3002 LBUMPD(ipf_stats[0], fr_v4_badsrc);
3003 fin->fin_flx |= FI_BADSRC;
3005 if (fin->fin_ip->ip_ttl < softc->ipf_minttl) {
3006 LBUMPD(ipf_stats[0], fr_v4_badttl);
3007 fin->fin_flx |= FI_LOWTTL;
3012 if (((ip6_t *)ip)->ip6_hlim < softc->ipf_minttl) {
3013 LBUMPD(ipf_stats[0], fr_v6_badttl);
3014 fin->fin_flx |= FI_LOWTTL;
3020 if (fin->fin_flx & FI_SHORT) {
3021 LBUMPD(ipf_stats[out], fr_short);
3024 READ_ENTER(&softc->ipf_mutex);
3030 if (ipf_nat_checkin(fin, &pass) == -1) {
3036 if (ipf_nat6_checkin(fin, &pass) == -1) {
3047 * If a packet is found in the auth table, then skip checking
3048 * the access lists for permission but we do need to consider
3049 * the result as if it were from the ACL's. In addition, being
3050 * found in the auth table means it has been seen before, so do
3051 * not pass it through accounting (again), lest it be counted twice.
3053 fr = ipf_auth_check(fin, &pass);
3054 if (!out && (fr == NULL))
3055 (void) ipf_acctpkt(fin, NULL);
3058 if ((fin->fin_flx & FI_FRAG) != 0)
3059 fr = ipf_frag_known(fin, &pass);
3062 fr = ipf_state_check(fin, &pass);
3065 if ((pass & FR_NOMATCH) || (fr == NULL))
3066 fr = ipf_firewall(fin, &pass);
3069 * If we've asked to track state for this packet, set it up.
3070 * Here rather than ipf_firewall because ipf_checkauth may decide
3071 * to return a packet for "keep state"
3073 if ((pass & FR_KEEPSTATE) && (fin->fin_m != NULL) &&
3074 !(fin->fin_flx & FI_STATE)) {
3075 if (ipf_state_add(softc, fin, NULL, 0) == 0) {
3076 LBUMP(ipf_stats[out].fr_ads);
3078 LBUMP(ipf_stats[out].fr_bads);
3079 if (FR_ISPASS(pass)) {
3081 pass &= ~FR_CMDMASK;
3083 fin->fin_reason = FRB_STATEADD;
3089 if ((fr != NULL) && !(fin->fin_flx & FI_STATE)) {
3090 fin->fin_dif = &fr->fr_dif;
3091 fin->fin_tif = &fr->fr_tifs[fin->fin_rev];
3095 * Only count/translate packets which will be passed on, out the
3098 if (out && FR_ISPASS(pass)) {
3099 (void) ipf_acctpkt(fin, NULL);
3104 if (ipf_nat_checkout(fin, &pass) == -1) {
3106 } else if ((softc->ipf_update_ipid != 0) && (v == 4)) {
3107 if (ipf_updateipid(fin) == -1) {
3109 LBUMP(ipf_stats[1].fr_ipud);
3110 pass &= ~FR_CMDMASK;
3112 fin->fin_reason = FRB_UPDATEIPID;
3114 LBUMP(ipf_stats[0].fr_ipud);
3120 (void) ipf_nat6_checkout(fin, &pass);
3130 if ((softc->ipf_flags & FF_LOGGING) || (pass & FR_LOGMASK)) {
3131 (void) ipf_dolog(fin, &pass);
3136 * The FI_STATE flag is cleared here so that calling ipf_state_check
3137 * will work when called from inside of fr_fastroute. Although
3138 * there is a similar flag, FI_NATED, for NAT, it does have the same
3139 * impact on code execution.
3141 fin->fin_flx &= ~FI_STATE;
3143 #if defined(FASTROUTE_RECURSION)
3145 * Up the reference on fr_lock and exit ipf_mutex. The generation of
3146 * a packet below can sometimes cause a recursive call into IPFilter.
3147 * On those platforms where that does happen, we need to hang onto
3148 * the filter rule just in case someone decides to remove or flush it
3152 MUTEX_ENTER(&fr->fr_lock);
3154 MUTEX_EXIT(&fr->fr_lock);
3157 RWLOCK_EXIT(&softc->ipf_mutex);
3160 if ((pass & FR_RETMASK) != 0) {
3162 * Should we return an ICMP packet to indicate error
3163 * status passing through the packet filter ?
3164 * WARNING: ICMP error packets AND TCP RST packets should
3165 * ONLY be sent in repsonse to incoming packets. Sending
3166 * them in response to outbound packets can result in a
3167 * panic on some operating systems.
3170 if (pass & FR_RETICMP) {
3173 if ((pass & FR_RETMASK) == FR_FAKEICMP)
3177 (void) ipf_send_icmp_err(ICMP_UNREACH, fin,
3179 LBUMP(ipf_stats[0].fr_ret);
3180 } else if (((pass & FR_RETMASK) == FR_RETRST) &&
3181 !(fin->fin_flx & FI_SHORT)) {
3182 if (((fin->fin_flx & FI_OOW) != 0) ||
3183 (ipf_send_reset(fin) == 0)) {
3184 LBUMP(ipf_stats[1].fr_ret);
3189 * When using return-* with auth rules, the auth code
3190 * takes over disposing of this packet.
3192 if (FR_ISAUTH(pass) && (fin->fin_m != NULL)) {
3193 DT1(frb_authcapture, fr_info_t *, fin);
3194 fin->fin_m = *fin->fin_mp = NULL;
3195 fin->fin_reason = FRB_AUTHCAPTURE;
3199 if (pass & FR_RETRST) {
3200 fin->fin_error = ECONNRESET;
3206 * After the above so that ICMP unreachables and TCP RSTs get
3209 if (FR_ISBLOCK(pass) && (fin->fin_flx & FI_NEWNAT))
3210 ipf_nat_uncreate(fin);
3213 * If we didn't drop off the bottom of the list of rules (and thus
3214 * the 'current' rule fr is not NULL), then we may have some extra
3215 * instructions about what to do with a packet.
3216 * Once we're finished return to our caller, freeing the packet if
3217 * we are dropping it.
3223 * Generate a duplicated packet first because ipf_fastroute
3224 * can lead to fin_m being free'd... not good.
3227 if ((fdp != NULL) && (fdp->fd_ptr != NULL) &&
3228 (fdp->fd_ptr != (void *)-1)) {
3229 mc = M_COPY(fin->fin_m);
3231 ipf_fastroute(mc, &mc, fin, fdp);
3235 if (!out && (pass & FR_FASTROUTE)) {
3237 * For fastroute rule, no destination interface defined
3238 * so pass NULL as the frdest_t parameter
3240 (void) ipf_fastroute(fin->fin_m, mp, fin, NULL);
3242 } else if ((fdp != NULL) && (fdp->fd_ptr != NULL) &&
3243 (fdp->fd_ptr != (struct ifnet *)-1)) {
3244 /* this is for to rules: */
3245 ipf_fastroute(fin->fin_m, mp, fin, fdp);
3249 #if defined(FASTROUTE_RECURSION)
3250 (void) ipf_derefrule(softc, &fr);
3253 #if !defined(FASTROUTE_RECURSION)
3254 RWLOCK_EXIT(&softc->ipf_mutex);
3258 if (!FR_ISPASS(pass)) {
3259 LBUMP(ipf_stats[out].fr_block);
3267 LBUMP(ipf_stats[out].fr_pass);
3268 #if defined(_KERNEL) && defined(__sgi)
3269 if ((fin->fin_hbuf != NULL) &&
3270 (mtod(fin->fin_m, struct ip *) != fin->fin_ip)) {
3271 COPYBACK(fin->fin_m, 0, fin->fin_plen, fin->fin_hbuf);
3279 if (FR_ISPASS(pass))
3281 LBUMP(ipf_stats[out].fr_blocked[fin->fin_reason]);
3282 return fin->fin_error;
3285 (*mp)->mb_ifp = fin->fin_ifp;
3286 blockreason = fin->fin_reason;
3287 FR_VERBOSE(("fin_flx %#x pass %#x ", fin->fin_flx, pass));
3288 /*if ((pass & FR_CMDMASK) == (softc->ipf_pass & FR_CMDMASK))*/
3289 if ((pass & FR_NOMATCH) != 0)
3292 if ((pass & FR_RETMASK) != 0)
3293 switch (pass & FR_RETMASK)
3303 switch (pass & FR_CMDMASK)
3317 #endif /* _KERNEL */
3322 /* ------------------------------------------------------------------------ */
3323 /* Function: ipf_dolog */
3324 /* Returns: frentry_t* - returns contents of fin_fr (no change made) */
3325 /* Parameters: fin(I) - pointer to packet information */
3326 /* passp(IO) - pointer to current/new filter decision (unused) */
3328 /* Checks flags set to see how a packet should be logged, if it is to be */
3329 /* logged. Adjust statistics based on its success or not. */
3330 /* ------------------------------------------------------------------------ */
3332 ipf_dolog(fin, passp)
3336 ipf_main_softc_t *softc = fin->fin_main_soft;
3343 if ((softc->ipf_flags & FF_LOGNOMATCH) && (pass & FR_NOMATCH)) {
3344 pass |= FF_LOGNOMATCH;
3345 LBUMPD(ipf_stats[out], fr_npkl);
3348 } else if (((pass & FR_LOGMASK) == FR_LOGP) ||
3349 (FR_ISPASS(pass) && (softc->ipf_flags & FF_LOGPASS))) {
3350 if ((pass & FR_LOGMASK) != FR_LOGP)
3352 LBUMPD(ipf_stats[out], fr_ppkl);
3355 } else if (((pass & FR_LOGMASK) == FR_LOGB) ||
3356 (FR_ISBLOCK(pass) && (softc->ipf_flags & FF_LOGBLOCK))) {
3357 if ((pass & FR_LOGMASK) != FR_LOGB)
3358 pass |= FF_LOGBLOCK;
3359 LBUMPD(ipf_stats[out], fr_bpkl);
3362 if (ipf_log_pkt(fin, pass) == -1) {
3364 * If the "or-block" option has been used then
3365 * block the packet if we failed to log it.
3367 if ((pass & FR_LOGORBLOCK) && FR_ISPASS(pass)) {
3368 DT1(frb_logfail2, u_int, pass);
3369 pass &= ~FR_CMDMASK;
3371 fin->fin_reason = FRB_LOGFAIL2;
3379 #endif /* IPFILTER_LOG */
3382 /* ------------------------------------------------------------------------ */
3383 /* Function: ipf_cksum */
3384 /* Returns: u_short - IP header checksum */
3385 /* Parameters: addr(I) - pointer to start of buffer to checksum */
3386 /* len(I) - length of buffer in bytes */
3388 /* Calculate the two's complement 16 bit checksum of the buffer passed. */
3390 /* N.B.: addr should be 16bit aligned. */
3391 /* ------------------------------------------------------------------------ */
3393 ipf_cksum(addr, len)
3399 for (sum = 0; len > 1; len -= 2)
3402 /* mop up an odd byte, if necessary */
3404 sum += *(u_char *)addr;
3407 * add back carry outs from top 16 bits to low 16 bits
3409 sum = (sum >> 16) + (sum & 0xffff); /* add hi 16 to low 16 */
3410 sum += (sum >> 16); /* add carry */
3411 return (u_short)(~sum);
3415 /* ------------------------------------------------------------------------ */
3416 /* Function: fr_cksum */
3417 /* Returns: u_short - layer 4 checksum */
3418 /* Parameters: fin(I) - pointer to packet information */
3419 /* ip(I) - pointer to IP header */
3420 /* l4proto(I) - protocol to caclulate checksum for */
3421 /* l4hdr(I) - pointer to layer 4 header */
3423 /* Calculates the TCP checksum for the packet held in "m", using the data */
3424 /* in the IP header "ip" to seed it. */
3426 /* NB: This function assumes we've pullup'd enough for all of the IP header */
3427 /* and the TCP header. We also assume that data blocks aren't allocated in */
3430 /* Expects ip_len and ip_off to be in network byte order when called. */
3431 /* ------------------------------------------------------------------------ */
3433 fr_cksum(fin, ip, l4proto, l4hdr)
3439 u_short *sp, slen, sumsave, *csump;
3454 sum = htons((u_short)l4proto);
3456 * Add up IP Header portion
3459 if (IP_V(ip) == 4) {
3461 hlen = IP_HL(ip) << 2;
3463 sp = (u_short *)&ip->ip_src;
3464 sum += *sp++; /* ip_src */
3466 sum += *sp++; /* ip_dst */
3469 } else if (IP_V(ip) == 6) {
3471 hlen = sizeof(*ip6);
3472 off = ((char *)fin->fin_dp - (char *)fin->fin_ip);
3473 sp = (u_short *)&ip6->ip6_src;
3474 sum += *sp++; /* ip6_src */
3482 /* This needs to be routing header aware. */
3483 sum += *sp++; /* ip6_dst */
3495 slen = fin->fin_plen - off;
3501 csump = &((udphdr_t *)l4hdr)->uh_sum;
3505 csump = &((tcphdr_t *)l4hdr)->th_sum;
3508 csump = &((icmphdr_t *)l4hdr)->icmp_cksum;
3509 sum = 0; /* Pseudo-checksum is not included */
3512 case IPPROTO_ICMPV6 :
3513 csump = &((struct icmp6_hdr *)l4hdr)->icmp6_cksum;
3520 if (csump != NULL) {
3525 sum2 = ipf_pcksum(fin, off, sum);
3532 /* ------------------------------------------------------------------------ */
3533 /* Function: ipf_findgroup */
3534 /* Returns: frgroup_t * - NULL = group not found, else pointer to group */
3535 /* Parameters: softc(I) - pointer to soft context main structure */
3536 /* group(I) - group name to search for */
3537 /* unit(I) - device to which this group belongs */
3538 /* set(I) - which set of rules (inactive/inactive) this is */
3539 /* fgpp(O) - pointer to place to store pointer to the pointer */
3540 /* to where to add the next (last) group or where */
3541 /* to delete group from. */
3543 /* Search amongst the defined groups for a particular group number. */
3544 /* ------------------------------------------------------------------------ */
3546 ipf_findgroup(softc, group, unit, set, fgpp)
3547 ipf_main_softc_t *softc;
3553 frgroup_t *fg, **fgp;
3556 * Which list of groups to search in is dependent on which list of
3557 * rules are being operated on.
3559 fgp = &softc->ipf_groups[unit][set];
3561 while ((fg = *fgp) != NULL) {
3562 if (strncmp(group, fg->fg_name, FR_GROUPLEN) == 0)
3573 /* ------------------------------------------------------------------------ */
3574 /* Function: ipf_group_add */
3575 /* Returns: frgroup_t * - NULL == did not create group, */
3576 /* != NULL == pointer to the group */
3577 /* Parameters: softc(I) - pointer to soft context main structure */
3578 /* num(I) - group number to add */
3579 /* head(I) - rule pointer that is using this as the head */
3580 /* flags(I) - rule flags which describe the type of rule it is */
3581 /* unit(I) - device to which this group will belong to */
3582 /* set(I) - which set of rules (inactive/inactive) this is */
3583 /* Write Locks: ipf_mutex */
3585 /* Add a new group head, or if it already exists, increase the reference */
3587 /* ------------------------------------------------------------------------ */
3589 ipf_group_add(softc, group, head, flags, unit, set)
3590 ipf_main_softc_t *softc;
3597 frgroup_t *fg, **fgp;
3603 if (unit == IPL_LOGIPF && *group == '\0')
3607 gflags = flags & FR_INOUT;
3609 fg = ipf_findgroup(softc, group, unit, set, &fgp);
3611 if (fg->fg_head == NULL && head != NULL)
3613 if (fg->fg_flags == 0)
3614 fg->fg_flags = gflags;
3615 else if (gflags != fg->fg_flags)
3621 KMALLOC(fg, frgroup_t *);
3624 fg->fg_start = NULL;
3626 bcopy(group, fg->fg_name, strlen(group) + 1);
3627 fg->fg_flags = gflags;
3629 fg->fg_set = &softc->ipf_groups[unit][set];
3636 /* ------------------------------------------------------------------------ */
3637 /* Function: ipf_group_del */
3638 /* Returns: int - number of rules deleted */
3639 /* Parameters: softc(I) - pointer to soft context main structure */
3640 /* group(I) - group name to delete */
3641 /* fr(I) - filter rule from which group is referenced */
3642 /* Write Locks: ipf_mutex */
3644 /* This function is called whenever a reference to a group is to be dropped */
3645 /* and thus its reference count needs to be lowered and the group free'd if */
3646 /* the reference count reaches zero. Passing in fr is really for the sole */
3647 /* purpose of knowing when the head rule is being deleted. */
3648 /* ------------------------------------------------------------------------ */
3650 ipf_group_del(softc, group, fr)
3651 ipf_main_softc_t *softc;
3656 if (group->fg_head == fr)
3657 group->fg_head = NULL;
3660 if ((group->fg_ref == 0) && (group->fg_start == NULL))
3661 ipf_group_free(group);
3665 /* ------------------------------------------------------------------------ */
3666 /* Function: ipf_group_free */
3668 /* Parameters: group(I) - pointer to filter rule group */
3670 /* Remove the group from the list of groups and free it. */
3671 /* ------------------------------------------------------------------------ */
3673 ipf_group_free(group)
3678 for (gp = group->fg_set; *gp != NULL; gp = &(*gp)->fg_next) {
3680 *gp = group->fg_next;
3688 /* ------------------------------------------------------------------------ */
3689 /* Function: ipf_group_flush */
3690 /* Returns: int - number of rules flush from group */
3691 /* Parameters: softc(I) - pointer to soft context main structure */
3692 /* Parameters: group(I) - pointer to filter rule group */
3694 /* Remove all of the rules that currently are listed under the given group. */
3695 /* ------------------------------------------------------------------------ */
3697 ipf_group_flush(softc, group)
3698 ipf_main_softc_t *softc;
3703 (void) ipf_flushlist(softc, &gone, &group->fg_start);
3709 /* ------------------------------------------------------------------------ */
3710 /* Function: ipf_getrulen */
3711 /* Returns: frentry_t * - NULL == not found, else pointer to rule n */
3712 /* Parameters: softc(I) - pointer to soft context main structure */
3713 /* Parameters: unit(I) - device for which to count the rule's number */
3714 /* flags(I) - which set of rules to find the rule in */
3715 /* group(I) - group name */
3716 /* n(I) - rule number to find */
3718 /* Find rule # n in group # g and return a pointer to it. Return NULl if */
3719 /* group # g doesn't exist or there are less than n rules in the group. */
3720 /* ------------------------------------------------------------------------ */
3722 ipf_getrulen(softc, unit, group, n)
3723 ipf_main_softc_t *softc;
3731 fg = ipf_findgroup(softc, group, unit, softc->ipf_active, NULL);
3734 for (fr = fg->fg_start; fr && n; fr = fr->fr_next, n--)
3742 /* ------------------------------------------------------------------------ */
3743 /* Function: ipf_flushlist */
3744 /* Returns: int - >= 0 - number of flushed rules */
3745 /* Parameters: softc(I) - pointer to soft context main structure */
3746 /* nfreedp(O) - pointer to int where flush count is stored */
3747 /* listp(I) - pointer to list to flush pointer */
3748 /* Write Locks: ipf_mutex */
3750 /* Recursively flush rules from the list, descending groups as they are */
3751 /* encountered. if a rule is the head of a group and it has lost all its */
3752 /* group members, then also delete the group reference. nfreedp is needed */
3753 /* to store the accumulating count of rules removed, whereas the returned */
3754 /* value is just the number removed from the current list. The latter is */
3755 /* needed to correctly adjust reference counts on rules that define groups. */
3757 /* NOTE: Rules not loaded from user space cannot be flushed. */
3758 /* ------------------------------------------------------------------------ */
3760 ipf_flushlist(softc, nfreedp, listp)
3761 ipf_main_softc_t *softc;
3768 while ((fp = *listp) != NULL) {
3769 if ((fp->fr_type & FR_T_BUILTIN) ||
3770 !(fp->fr_flags & FR_COPIED)) {
3771 listp = &fp->fr_next;
3774 *listp = fp->fr_next;
3775 if (fp->fr_next != NULL)
3776 fp->fr_next->fr_pnext = fp->fr_pnext;
3777 fp->fr_pnext = NULL;
3779 if (fp->fr_grphead != NULL) {
3780 freed += ipf_group_flush(softc, fp->fr_grphead);
3781 fp->fr_names[fp->fr_grhead] = '\0';
3784 if (fp->fr_icmpgrp != NULL) {
3785 freed += ipf_group_flush(softc, fp->fr_icmpgrp);
3786 fp->fr_names[fp->fr_icmphead] = '\0';
3789 if (fp->fr_srctrack.ht_max_nodes)
3790 ipf_rb_ht_flush(&fp->fr_srctrack);
3794 ASSERT(fp->fr_ref > 0);
3795 if (ipf_derefrule(softc, &fp) == 0)
3803 /* ------------------------------------------------------------------------ */
3804 /* Function: ipf_flush */
3805 /* Returns: int - >= 0 - number of flushed rules */
3806 /* Parameters: softc(I) - pointer to soft context main structure */
3807 /* unit(I) - device for which to flush rules */
3808 /* flags(I) - which set of rules to flush */
3810 /* Calls flushlist() for all filter rules (accounting, firewall - both IPv4 */
3811 /* and IPv6) as defined by the value of flags. */
3812 /* ------------------------------------------------------------------------ */
3814 ipf_flush(softc, unit, flags)
3815 ipf_main_softc_t *softc;
3819 int flushed = 0, set;
3821 WRITE_ENTER(&softc->ipf_mutex);
3823 set = softc->ipf_active;
3824 if ((flags & FR_INACTIVE) == FR_INACTIVE)
3827 if (flags & FR_OUTQUE) {
3828 ipf_flushlist(softc, &flushed, &softc->ipf_rules[1][set]);
3829 ipf_flushlist(softc, &flushed, &softc->ipf_acct[1][set]);
3831 if (flags & FR_INQUE) {
3832 ipf_flushlist(softc, &flushed, &softc->ipf_rules[0][set]);
3833 ipf_flushlist(softc, &flushed, &softc->ipf_acct[0][set]);
3836 flushed += ipf_flush_groups(softc, &softc->ipf_groups[unit][set],
3837 flags & (FR_INQUE|FR_OUTQUE));
3839 RWLOCK_EXIT(&softc->ipf_mutex);
3841 if (unit == IPL_LOGIPF) {
3844 tmp = ipf_flush(softc, IPL_LOGCOUNT, flags);
3852 /* ------------------------------------------------------------------------ */
3853 /* Function: ipf_flush_groups */
3854 /* Returns: int - >= 0 - number of flushed rules */
3855 /* Parameters: softc(I) - soft context pointerto work with */
3856 /* grhead(I) - pointer to the start of the group list to flush */
3857 /* flags(I) - which set of rules to flush */
3859 /* Walk through all of the groups under the given group head and remove all */
3860 /* of those that match the flags passed in. The for loop here is bit more */
3861 /* complicated than usual because the removal of a rule with ipf_derefrule */
3862 /* may end up removing not only the structure pointed to by "fg" but also */
3863 /* what is fg_next and fg_next after that. So if a filter rule is actually */
3864 /* removed from the group then it is necessary to start again. */
3865 /* ------------------------------------------------------------------------ */
3867 ipf_flush_groups(softc, grhead, flags)
3868 ipf_main_softc_t *softc;
3872 frentry_t *fr, **frp;
3873 frgroup_t *fg, **fgp;
3877 for (fgp = grhead; (fg = *fgp) != NULL; ) {
3878 while ((fg != NULL) && ((fg->fg_flags & flags) == 0))
3883 frp = &fg->fg_start;
3884 while ((removed == 0) && ((fr = *frp) != NULL)) {
3885 if ((fr->fr_flags & flags) == 0) {
3888 if (fr->fr_next != NULL)
3889 fr->fr_next->fr_pnext = fr->fr_pnext;
3891 fr->fr_pnext = NULL;
3893 (void) ipf_derefrule(softc, &fr);
3905 /* ------------------------------------------------------------------------ */
3906 /* Function: memstr */
3907 /* Returns: char * - NULL if failed, != NULL pointer to matching bytes */
3908 /* Parameters: src(I) - pointer to byte sequence to match */
3909 /* dst(I) - pointer to byte sequence to search */
3910 /* slen(I) - match length */
3911 /* dlen(I) - length available to search in */
3913 /* Search dst for a sequence of bytes matching those at src and extend for */
3915 /* ------------------------------------------------------------------------ */
3917 memstr(src, dst, slen, dlen)
3924 while (dlen >= slen) {
3925 if (bcmp(src, dst, slen) == 0) {
3934 /* ------------------------------------------------------------------------ */
3935 /* Function: ipf_fixskip */
3937 /* Parameters: listp(IO) - pointer to start of list with skip rule */
3938 /* rp(I) - rule added/removed with skip in it. */
3939 /* addremove(I) - adjustment (-1/+1) to make to skip count, */
3940 /* depending on whether a rule was just added */
3943 /* Adjust all the rules in a list which would have skip'd past the position */
3944 /* where we are inserting to skip to the right place given the change. */
3945 /* ------------------------------------------------------------------------ */
3947 ipf_fixskip(listp, rp, addremove)
3948 frentry_t **listp, *rp;
3955 for (fp = *listp; (fp != NULL) && (fp != rp); fp = fp->fr_next)
3961 for (rn = 0, fp = *listp; fp && (fp != rp); fp = fp->fr_next, rn++)
3962 if (FR_ISSKIP(fp->fr_flags) && (rn + fp->fr_arg >= rules))
3963 fp->fr_arg += addremove;
3968 /* ------------------------------------------------------------------------ */
3969 /* Function: count4bits */
3970 /* Returns: int - >= 0 - number of consecutive bits in input */
3971 /* Parameters: ip(I) - 32bit IP address */
3974 /* count consecutive 1's in bit mask. If the mask generated by counting */
3975 /* consecutive 1's is different to that passed, return -1, else return # */
3977 /* ------------------------------------------------------------------------ */
3985 ip = ipn = ntohl(ip);
3986 for (i = 32; i; i--, ipn *= 2)
3987 if (ipn & 0x80000000)
3992 for (i = 32, j = cnt; i; i--, j--) {
4003 /* ------------------------------------------------------------------------ */
4004 /* Function: count6bits */
4005 /* Returns: int - >= 0 - number of consecutive bits in input */
4006 /* Parameters: msk(I) - pointer to start of IPv6 bitmask */
4009 /* count consecutive 1's in bit mask. */
4010 /* ------------------------------------------------------------------------ */
4019 for (k = 3; k >= 0; k--)
4020 if (msk[k] == 0xffffffff)
4023 for (j = msk[k]; j; j <<= 1)
4030 #endif /* _KERNEL */
4033 /* ------------------------------------------------------------------------ */
4034 /* Function: ipf_synclist */
4035 /* Returns: int - 0 = no failures, else indication of first failure */
4036 /* Parameters: fr(I) - start of filter list to sync interface names for */
4037 /* ifp(I) - interface pointer for limiting sync lookups */
4038 /* Write Locks: ipf_mutex */
4040 /* Walk through a list of filter rules and resolve any interface names into */
4041 /* pointers. Where dynamic addresses are used, also update the IP address */
4042 /* used in the rule. The interface pointer is used to limit the lookups to */
4043 /* a specific set of matching names if it is non-NULL. */
4044 /* Errors can occur when resolving the destination name of to/dup-to fields */
4045 /* when the name points to a pool and that pool doest not exist. If this */
4046 /* does happen then it is necessary to check if there are any lookup refs */
4047 /* that need to be dropped before returning with an error. */
4048 /* ------------------------------------------------------------------------ */
4050 ipf_synclist(softc, fr, ifp)
4051 ipf_main_softc_t *softc;
4055 frentry_t *frt, *start = fr;
4064 for (; fr; fr = fr->fr_next) {
4065 if (fr->fr_family == AF_INET)
4067 else if (fr->fr_family == AF_INET6)
4073 * Lookup all the interface names that are part of the rule.
4075 for (i = 0; i < 4; i++) {
4076 if ((ifp != NULL) && (fr->fr_ifas[i] != ifp))
4078 if (fr->fr_ifnames[i] == -1)
4080 name = FR_NAME(fr, fr_ifnames[i]);
4081 fr->fr_ifas[i] = ipf_resolvenic(softc, name, v);
4084 if ((fr->fr_type & ~FR_T_BUILTIN) == FR_T_IPF) {
4085 if (fr->fr_satype != FRI_NORMAL &&
4086 fr->fr_satype != FRI_LOOKUP) {
4087 ifa = ipf_resolvenic(softc, fr->fr_names +
4089 ipf_ifpaddr(softc, v, fr->fr_satype, ifa,
4090 &fr->fr_src6, &fr->fr_smsk6);
4092 if (fr->fr_datype != FRI_NORMAL &&
4093 fr->fr_datype != FRI_LOOKUP) {
4094 ifa = ipf_resolvenic(softc, fr->fr_names +
4096 ipf_ifpaddr(softc, v, fr->fr_datype, ifa,
4097 &fr->fr_dst6, &fr->fr_dmsk6);
4101 fdp = &fr->fr_tifs[0];
4102 if ((ifp == NULL) || (fdp->fd_ptr == ifp)) {
4103 error = ipf_resolvedest(softc, fr->fr_names, fdp, v);
4108 fdp = &fr->fr_tifs[1];
4109 if ((ifp == NULL) || (fdp->fd_ptr == ifp)) {
4110 error = ipf_resolvedest(softc, fr->fr_names, fdp, v);
4116 if ((ifp == NULL) || (fdp->fd_ptr == ifp)) {
4117 error = ipf_resolvedest(softc, fr->fr_names, fdp, v);
4122 if (((fr->fr_type & ~FR_T_BUILTIN) == FR_T_IPF) &&
4123 (fr->fr_satype == FRI_LOOKUP) && (fr->fr_srcptr == NULL)) {
4124 fr->fr_srcptr = ipf_lookup_res_num(softc,
4130 if (((fr->fr_type & ~FR_T_BUILTIN) == FR_T_IPF) &&
4131 (fr->fr_datype == FRI_LOOKUP) && (fr->fr_dstptr == NULL)) {
4132 fr->fr_dstptr = ipf_lookup_res_num(softc,
4142 for (frt = start; frt != fr; fr = fr->fr_next) {
4143 if (((frt->fr_type & ~FR_T_BUILTIN) == FR_T_IPF) &&
4144 (frt->fr_satype == FRI_LOOKUP) && (frt->fr_srcptr != NULL))
4145 ipf_lookup_deref(softc, frt->fr_srctype,
4147 if (((frt->fr_type & ~FR_T_BUILTIN) == FR_T_IPF) &&
4148 (frt->fr_datype == FRI_LOOKUP) && (frt->fr_dstptr != NULL))
4149 ipf_lookup_deref(softc, frt->fr_dsttype,
4156 /* ------------------------------------------------------------------------ */
4157 /* Function: ipf_sync */
4159 /* Parameters: Nil */
4161 /* ipf_sync() is called when we suspect that the interface list or */
4162 /* information about interfaces (like IP#) has changed. Go through all */
4163 /* filter rules, NAT entries and the state table and check if anything */
4164 /* needs to be changed/updated. */
4165 /* ------------------------------------------------------------------------ */
4167 ipf_sync(softc, ifp)
4168 ipf_main_softc_t *softc;
4174 ipf_nat_sync(softc, ifp);
4175 ipf_state_sync(softc, ifp);
4176 ipf_lookup_sync(softc, ifp);
4179 WRITE_ENTER(&softc->ipf_mutex);
4180 (void) ipf_synclist(softc, softc->ipf_acct[0][softc->ipf_active], ifp);
4181 (void) ipf_synclist(softc, softc->ipf_acct[1][softc->ipf_active], ifp);
4182 (void) ipf_synclist(softc, softc->ipf_rules[0][softc->ipf_active], ifp);
4183 (void) ipf_synclist(softc, softc->ipf_rules[1][softc->ipf_active], ifp);
4185 for (i = 0; i < IPL_LOGSIZE; i++) {
4188 for (g = softc->ipf_groups[i][0]; g != NULL; g = g->fg_next)
4189 (void) ipf_synclist(softc, g->fg_start, ifp);
4190 for (g = softc->ipf_groups[i][1]; g != NULL; g = g->fg_next)
4191 (void) ipf_synclist(softc, g->fg_start, ifp);
4193 RWLOCK_EXIT(&softc->ipf_mutex);
4200 * In the functions below, bcopy() is called because the pointer being
4201 * copied _from_ in this instance is a pointer to a char buf (which could
4202 * end up being unaligned) and on the kernel's local stack.
4204 /* ------------------------------------------------------------------------ */
4205 /* Function: copyinptr */
4206 /* Returns: int - 0 = success, else failure */
4207 /* Parameters: src(I) - pointer to the source address */
4208 /* dst(I) - destination address */
4209 /* size(I) - number of bytes to copy */
4211 /* Copy a block of data in from user space, given a pointer to the pointer */
4212 /* to start copying from (src) and a pointer to where to store it (dst). */
4213 /* NB: src - pointer to user space pointer, dst - kernel space pointer */
4214 /* ------------------------------------------------------------------------ */
4216 copyinptr(softc, src, dst, size)
4217 ipf_main_softc_t *softc;
4225 error = COPYIN(src, &ca, sizeof(ca));
4229 bcopy(src, (caddr_t)&ca, sizeof(ca));
4231 error = COPYIN(ca, dst, size);
4240 /* ------------------------------------------------------------------------ */
4241 /* Function: copyoutptr */
4242 /* Returns: int - 0 = success, else failure */
4243 /* Parameters: src(I) - pointer to the source address */
4244 /* dst(I) - destination address */
4245 /* size(I) - number of bytes to copy */
4247 /* Copy a block of data out to user space, given a pointer to the pointer */
4248 /* to start copying from (src) and a pointer to where to store it (dst). */
4249 /* NB: src - kernel space pointer, dst - pointer to user space pointer. */
4250 /* ------------------------------------------------------------------------ */
4252 copyoutptr(softc, src, dst, size)
4253 ipf_main_softc_t *softc;
4260 bcopy(dst, (caddr_t)&ca, sizeof(ca));
4261 error = COPYOUT(src, ca, size);
4272 /* ------------------------------------------------------------------------ */
4273 /* Function: ipf_lock */
4274 /* Returns: int - 0 = success, else error */
4275 /* Parameters: data(I) - pointer to lock value to set */
4276 /* lockp(O) - pointer to location to store old lock value */
4278 /* Get the new value for the lock integer, set it and return the old value */
4280 /* ------------------------------------------------------------------------ */
4282 ipf_lock(data, lockp)
4288 err = BCOPYIN(data, &arg, sizeof(arg));
4291 err = BCOPYOUT(lockp, data, sizeof(*lockp));
4299 /* ------------------------------------------------------------------------ */
4300 /* Function: ipf_getstat */
4302 /* Parameters: softc(I) - pointer to soft context main structure */
4303 /* fiop(I) - pointer to ipfilter stats structure */
4304 /* rev(I) - version claim by program doing ioctl */
4306 /* Stores a copy of current pointers, counters, etc, in the friostat */
4308 /* If IPFILTER_COMPAT is compiled, we pretend to be whatever version the */
4309 /* program is looking for. This ensure that validation of the version it */
4310 /* expects will always succeed. Thus kernels with IPFILTER_COMPAT will */
4311 /* allow older binaries to work but kernels without it will not. */
4312 /* ------------------------------------------------------------------------ */
4315 ipf_getstat(softc, fiop, rev)
4316 ipf_main_softc_t *softc;
4322 bcopy((char *)softc->ipf_stats, (char *)fiop->f_st,
4323 sizeof(ipf_statistics_t) * 2);
4324 fiop->f_locks[IPL_LOGSTATE] = -1;
4325 fiop->f_locks[IPL_LOGNAT] = -1;
4326 fiop->f_locks[IPL_LOGIPF] = -1;
4327 fiop->f_locks[IPL_LOGAUTH] = -1;
4329 fiop->f_ipf[0][0] = softc->ipf_rules[0][0];
4330 fiop->f_acct[0][0] = softc->ipf_acct[0][0];
4331 fiop->f_ipf[0][1] = softc->ipf_rules[0][1];
4332 fiop->f_acct[0][1] = softc->ipf_acct[0][1];
4333 fiop->f_ipf[1][0] = softc->ipf_rules[1][0];
4334 fiop->f_acct[1][0] = softc->ipf_acct[1][0];
4335 fiop->f_ipf[1][1] = softc->ipf_rules[1][1];
4336 fiop->f_acct[1][1] = softc->ipf_acct[1][1];
4338 fiop->f_ticks = softc->ipf_ticks;
4339 fiop->f_active = softc->ipf_active;
4340 fiop->f_froute[0] = softc->ipf_frouteok[0];
4341 fiop->f_froute[1] = softc->ipf_frouteok[1];
4342 fiop->f_rb_no_mem = softc->ipf_rb_no_mem;
4343 fiop->f_rb_node_max = softc->ipf_rb_node_max;
4345 fiop->f_running = softc->ipf_running;
4346 for (i = 0; i < IPL_LOGSIZE; i++) {
4347 fiop->f_groups[i][0] = softc->ipf_groups[i][0];
4348 fiop->f_groups[i][1] = softc->ipf_groups[i][1];
4351 fiop->f_log_ok = ipf_log_logok(softc, IPL_LOGIPF);
4352 fiop->f_log_fail = ipf_log_failures(softc, IPL_LOGIPF);
4353 fiop->f_logging = 1;
4356 fiop->f_log_fail = 0;
4357 fiop->f_logging = 0;
4359 fiop->f_defpass = softc->ipf_pass;
4360 fiop->f_features = ipf_features;
4362 #ifdef IPFILTER_COMPAT
4363 sprintf(fiop->f_version, "IP Filter: v%d.%d.%d",
4364 (rev / 1000000) % 100,
4365 (rev / 10000) % 100,
4369 (void) strncpy(fiop->f_version, ipfilter_version,
4370 sizeof(fiop->f_version));
4376 int icmptoicmp6types[ICMP_MAXTYPE+1] = {
4377 ICMP6_ECHO_REPLY, /* 0: ICMP_ECHOREPLY */
4380 ICMP6_DST_UNREACH, /* 3: ICMP_UNREACH */
4381 -1, /* 4: ICMP_SOURCEQUENCH */
4382 ND_REDIRECT, /* 5: ICMP_REDIRECT */
4385 ICMP6_ECHO_REQUEST, /* 8: ICMP_ECHO */
4387 -1, /* 10: UNUSED */
4388 ICMP6_TIME_EXCEEDED, /* 11: ICMP_TIMXCEED */
4389 ICMP6_PARAM_PROB, /* 12: ICMP_PARAMPROB */
4390 -1, /* 13: ICMP_TSTAMP */
4391 -1, /* 14: ICMP_TSTAMPREPLY */
4392 -1, /* 15: ICMP_IREQ */
4393 -1, /* 16: ICMP_IREQREPLY */
4394 -1, /* 17: ICMP_MASKREQ */
4395 -1, /* 18: ICMP_MASKREPLY */
4399 int icmptoicmp6unreach[ICMP_MAX_UNREACH] = {
4400 ICMP6_DST_UNREACH_ADDR, /* 0: ICMP_UNREACH_NET */
4401 ICMP6_DST_UNREACH_ADDR, /* 1: ICMP_UNREACH_HOST */
4402 -1, /* 2: ICMP_UNREACH_PROTOCOL */
4403 ICMP6_DST_UNREACH_NOPORT, /* 3: ICMP_UNREACH_PORT */
4404 -1, /* 4: ICMP_UNREACH_NEEDFRAG */
4405 ICMP6_DST_UNREACH_NOTNEIGHBOR, /* 5: ICMP_UNREACH_SRCFAIL */
4406 ICMP6_DST_UNREACH_ADDR, /* 6: ICMP_UNREACH_NET_UNKNOWN */
4407 ICMP6_DST_UNREACH_ADDR, /* 7: ICMP_UNREACH_HOST_UNKNOWN */
4408 -1, /* 8: ICMP_UNREACH_ISOLATED */
4409 ICMP6_DST_UNREACH_ADMIN, /* 9: ICMP_UNREACH_NET_PROHIB */
4410 ICMP6_DST_UNREACH_ADMIN, /* 10: ICMP_UNREACH_HOST_PROHIB */
4411 -1, /* 11: ICMP_UNREACH_TOSNET */
4412 -1, /* 12: ICMP_UNREACH_TOSHOST */
4413 ICMP6_DST_UNREACH_ADMIN, /* 13: ICMP_UNREACH_ADMIN_PROHIBIT */
4415 int icmpreplytype6[ICMP6_MAXTYPE + 1];
4418 int icmpreplytype4[ICMP_MAXTYPE + 1];
4421 /* ------------------------------------------------------------------------ */
4422 /* Function: ipf_matchicmpqueryreply */
4423 /* Returns: int - 1 if "icmp" is a valid reply to "ic" else 0. */
4424 /* Parameters: v(I) - IP protocol version (4 or 6) */
4425 /* ic(I) - ICMP information */
4426 /* icmp(I) - ICMP packet header */
4427 /* rev(I) - direction (0 = forward/1 = reverse) of packet */
4429 /* Check if the ICMP packet defined by the header pointed to by icmp is a */
4430 /* reply to one as described by what's in ic. If it is a match, return 1, */
4431 /* else return 0 for no match. */
4432 /* ------------------------------------------------------------------------ */
4434 ipf_matchicmpqueryreply(v, ic, icmp, rev)
4442 ictype = ic->ici_type;
4446 * If we matched its type on the way in, then when going out
4447 * it will still be the same type.
4449 if ((!rev && (icmp->icmp_type == ictype)) ||
4450 (rev && (icmpreplytype4[ictype] == icmp->icmp_type))) {
4451 if (icmp->icmp_type != ICMP_ECHOREPLY)
4453 if (icmp->icmp_id == ic->ici_id)
4459 if ((!rev && (icmp->icmp_type == ictype)) ||
4460 (rev && (icmpreplytype6[ictype] == icmp->icmp_type))) {
4461 if (icmp->icmp_type != ICMP6_ECHO_REPLY)
4463 if (icmp->icmp_id == ic->ici_id)
4472 /* ------------------------------------------------------------------------ */
4473 /* Function: ipf_rule_compare */
4474 /* Parameters: fr1(I) - first rule structure to compare */
4475 /* fr2(I) - second rule structure to compare */
4476 /* Returns: int - 0 == rules are the same, else mismatch */
4478 /* Compare two rules and return 0 if they match or a number indicating */
4479 /* which of the individual checks failed. */
4480 /* ------------------------------------------------------------------------ */
4482 ipf_rule_compare(frentry_t *fr1, frentry_t *fr2)
4484 if (fr1->fr_cksum != fr2->fr_cksum)
4486 if (fr1->fr_size != fr2->fr_size)
4488 if (fr1->fr_dsize != fr2->fr_dsize)
4490 if (bcmp((char *)&fr1->fr_func, (char *)&fr2->fr_func,
4491 fr1->fr_size - offsetof(struct frentry, fr_func)) != 0)
4493 if (fr1->fr_data && !fr2->fr_data)
4495 if (!fr1->fr_data && fr2->fr_data)
4498 if (bcmp(fr1->fr_caddr, fr2->fr_caddr, fr1->fr_dsize))
4505 /* ------------------------------------------------------------------------ */
4506 /* Function: frrequest */
4507 /* Returns: int - 0 == success, > 0 == errno value */
4508 /* Parameters: unit(I) - device for which this is for */
4509 /* req(I) - ioctl command (SIOC*) */
4510 /* data(I) - pointr to ioctl data */
4511 /* set(I) - 1 or 0 (filter set) */
4512 /* makecopy(I) - flag indicating whether data points to a rule */
4513 /* in kernel space & hence doesn't need copying. */
4515 /* This function handles all the requests which operate on the list of */
4516 /* filter rules. This includes adding, deleting, insertion. It is also */
4517 /* responsible for creating groups when a "head" rule is loaded. Interface */
4518 /* names are resolved here and other sanity checks are made on the content */
4519 /* of the rule structure being loaded. If a rule has user defined timeouts */
4520 /* then make sure they are created and initialised before exiting. */
4521 /* ------------------------------------------------------------------------ */
4523 frrequest(softc, unit, req, data, set, makecopy)
4524 ipf_main_softc_t *softc;
4530 int error = 0, in, family, addrem, need_free = 0;
4531 frentry_t frd, *fp, *f, **fprev, **ftail;
4532 void *ptr, *uptr, *cptr;
4541 if (makecopy != 0) {
4542 bzero(fp, sizeof(frd));
4543 error = ipf_inobj(softc, data, NULL, fp, IPFOBJ_FRENTRY);
4547 if ((fp->fr_type & FR_T_BUILTIN) != 0) {
4551 KMALLOCS(f, frentry_t *, fp->fr_size);
4556 bzero(f, fp->fr_size);
4557 error = ipf_inobjsz(softc, data, f, IPFOBJ_FRENTRY,
4560 KFREES(f, fp->fr_size);
4567 fp->fr_dnext = NULL;
4568 fp->fr_pnext = NULL;
4569 fp->fr_pdnext = NULL;
4571 fp->fr_grphead = NULL;
4572 fp->fr_icmpgrp = NULL;
4573 fp->fr_isc = (void *)-1;
4576 fp->fr_flags |= FR_COPIED;
4578 fp = (frentry_t *)data;
4579 if ((fp->fr_type & FR_T_BUILTIN) == 0) {
4583 fp->fr_flags &= ~FR_COPIED;
4586 if (((fp->fr_dsize == 0) && (fp->fr_data != NULL)) ||
4587 ((fp->fr_dsize != 0) && (fp->fr_data == NULL))) {
4593 family = fp->fr_family;
4596 if (req == (ioctlcmd_t)SIOCINAFR || req == (ioctlcmd_t)SIOCINIFR ||
4597 req == (ioctlcmd_t)SIOCADAFR || req == (ioctlcmd_t)SIOCADIFR)
4599 else if (req == (ioctlcmd_t)SIOCRMAFR || req == (ioctlcmd_t)SIOCRMIFR)
4601 else if (req == (ioctlcmd_t)SIOCZRLST)
4610 * Only filter rules for IPv4 or IPv6 are accepted.
4612 if (family == AF_INET) {
4615 } else if (family == AF_INET6) {
4618 } else if (family != 0) {
4625 * If the rule is being loaded from user space, i.e. we had to copy it
4626 * into kernel space, then do not trust the function pointer in the
4629 if ((makecopy == 1) && (fp->fr_func != NULL)) {
4630 if (ipf_findfunc(fp->fr_func) == NULL) {
4637 error = ipf_funcinit(softc, fp);
4642 if ((fp->fr_flags & FR_CALLNOW) &&
4643 ((fp->fr_func == NULL) || (fp->fr_func == (ipfunc_t)-1))) {
4648 if (((fp->fr_flags & FR_CMDMASK) == FR_CALL) &&
4649 ((fp->fr_func == NULL) || (fp->fr_func == (ipfunc_t)-1))) {
4658 if (FR_ISACCOUNT(fp->fr_flags))
4659 unit = IPL_LOGCOUNT;
4662 * Check that each group name in the rule has a start index that
4665 if (fp->fr_icmphead != -1) {
4666 if ((fp->fr_icmphead < 0) ||
4667 (fp->fr_icmphead >= fp->fr_namelen)) {
4672 if (!strcmp(FR_NAME(fp, fr_icmphead), "0"))
4673 fp->fr_names[fp->fr_icmphead] = '\0';
4676 if (fp->fr_grhead != -1) {
4677 if ((fp->fr_grhead < 0) ||
4678 (fp->fr_grhead >= fp->fr_namelen)) {
4683 if (!strcmp(FR_NAME(fp, fr_grhead), "0"))
4684 fp->fr_names[fp->fr_grhead] = '\0';
4687 if (fp->fr_group != -1) {
4688 if ((fp->fr_group < 0) ||
4689 (fp->fr_group >= fp->fr_namelen)) {
4694 if ((req != (int)SIOCZRLST) && (fp->fr_group != -1)) {
4696 * Allow loading rules that are in groups to cause
4697 * them to be created if they don't already exit.
4699 group = FR_NAME(fp, fr_group);
4701 fg = ipf_group_add(softc, group, NULL,
4702 fp->fr_flags, unit, set);
4705 fg = ipf_findgroup(softc, group, unit,
4714 if (fg->fg_flags == 0) {
4715 fg->fg_flags = fp->fr_flags & FR_INOUT;
4716 } else if (fg->fg_flags != (fp->fr_flags & FR_INOUT)) {
4724 * If a rule is going to be part of a group then it does
4725 * not matter whether it is an in or out rule, but if it
4726 * isn't in a group, then it does...
4728 if ((fp->fr_flags & (FR_INQUE|FR_OUTQUE)) == 0) {
4734 in = (fp->fr_flags & FR_INQUE) ? 0 : 1;
4737 * Work out which rule list this change is being applied to.
4741 if (unit == IPL_LOGAUTH) {
4742 if ((fp->fr_tifs[0].fd_ptr != NULL) ||
4743 (fp->fr_tifs[1].fd_ptr != NULL) ||
4744 (fp->fr_dif.fd_ptr != NULL) ||
4745 (fp->fr_flags & FR_FASTROUTE)) {
4746 softc->ipf_interror = 145;
4750 fprev = ipf_auth_rulehead(softc);
4752 if (FR_ISACCOUNT(fp->fr_flags))
4753 fprev = &softc->ipf_acct[in][set];
4754 else if ((fp->fr_flags & (FR_OUTQUE|FR_INQUE)) != 0)
4755 fprev = &softc->ipf_rules[in][set];
4757 if (fprev == NULL) {
4764 fprev = &fg->fg_start;
4767 * Copy in extra data for the rule.
4769 if (fp->fr_dsize != 0) {
4770 if (makecopy != 0) {
4771 KMALLOCS(ptr, void *, fp->fr_dsize);
4779 * The bcopy case is for when the data is appended
4780 * to the rule by ipf_in_compat().
4782 if (uptr >= (void *)fp &&
4783 uptr < (void *)((char *)fp + fp->fr_size)) {
4784 bcopy(uptr, ptr, fp->fr_dsize);
4787 error = COPYIN(uptr, ptr, fp->fr_dsize);
4803 * Perform per-rule type sanity checks of their members.
4804 * All code after this needs to be aware that allocated memory
4805 * may need to be free'd before exiting.
4807 switch (fp->fr_type & ~FR_T_BUILTIN)
4809 #if defined(IPFILTER_BPF)
4811 if (fp->fr_dsize == 0) {
4816 if (!bpf_validate(ptr, fp->fr_dsize/sizeof(struct bpf_insn))) {
4825 * Preparation for error case at the bottom of this function.
4827 if (fp->fr_datype == FRI_LOOKUP)
4828 fp->fr_dstptr = NULL;
4829 if (fp->fr_satype == FRI_LOOKUP)
4830 fp->fr_srcptr = NULL;
4832 if (fp->fr_dsize != sizeof(fripf_t)) {
4839 * Allowing a rule with both "keep state" and "with oow" is
4840 * pointless because adding a state entry to the table will
4841 * fail with the out of window (oow) flag set.
4843 if ((fp->fr_flags & FR_KEEPSTATE) && (fp->fr_flx & FI_OOW)) {
4849 switch (fp->fr_satype)
4851 case FRI_BROADCAST :
4854 case FRI_NETMASKED :
4856 if (fp->fr_sifpidx < 0) {
4862 fp->fr_srcptr = ipf_findlookup(softc, unit, fp,
4865 if (fp->fr_srcfunc == NULL) {
4881 switch (fp->fr_datype)
4883 case FRI_BROADCAST :
4886 case FRI_NETMASKED :
4888 if (fp->fr_difpidx < 0) {
4894 fp->fr_dstptr = ipf_findlookup(softc, unit, fp,
4897 if (fp->fr_dstfunc == NULL) {
4911 case FR_T_CALLFUNC :
4916 if (ipf_matcharray_verify(fp->fr_data, fp->fr_dsize) == -1) {
4930 if (fp->fr_tif.fd_name != -1) {
4931 if ((fp->fr_tif.fd_name < 0) ||
4932 (fp->fr_tif.fd_name >= fp->fr_namelen)) {
4939 if (fp->fr_dif.fd_name != -1) {
4940 if ((fp->fr_dif.fd_name < 0) ||
4941 (fp->fr_dif.fd_name >= fp->fr_namelen)) {
4948 if (fp->fr_rif.fd_name != -1) {
4949 if ((fp->fr_rif.fd_name < 0) ||
4950 (fp->fr_rif.fd_name >= fp->fr_namelen)) {
4958 * Lookup all the interface names that are part of the rule.
4960 error = ipf_synclist(softc, fp, NULL);
4963 fp->fr_statecnt = 0;
4964 if (fp->fr_srctrack.ht_max_nodes != 0)
4965 ipf_rb_ht_init(&fp->fr_srctrack);
4968 * Look for an existing matching filter rule, but don't include the
4969 * next or interface pointer in the comparison (fr_next, fr_ifa).
4970 * This elminates rules which are indentical being loaded. Checksum
4971 * the constant part of the filter rule to make comparisons quicker
4972 * (this meaning no pointers are included).
4974 for (fp->fr_cksum = 0, p = (u_int *)&fp->fr_func, pp = &fp->fr_cksum;
4977 pp = (u_int *)(fp->fr_caddr + fp->fr_dsize);
4978 for (p = (u_int *)fp->fr_data; p < pp; p++)
4981 WRITE_ENTER(&softc->ipf_mutex);
4984 * Now that the filter rule lists are locked, we can walk the
4985 * chain of them without fear.
4988 for (f = *ftail; (f = *ftail) != NULL; ftail = &f->fr_next) {
4989 if (fp->fr_collect <= f->fr_collect) {
4997 for (; (f = *ftail) != NULL; ftail = &f->fr_next) {
4998 if (ipf_rule_compare(fp, f) == 0)
5003 * If zero'ing statistics, copy current to caller and zero.
5011 * Copy and reduce lock because of impending copyout.
5012 * Well we should, but if we do then the atomicity of
5013 * this call and the correctness of fr_hits and
5014 * fr_bytes cannot be guaranteed. As it is, this code
5015 * only resets them to 0 if they are successfully
5016 * copied out into user space.
5018 bcopy((char *)f, (char *)fp, f->fr_size);
5019 /* MUTEX_DOWNGRADE(&softc->ipf_mutex); */
5022 * When we copy this rule back out, set the data
5023 * pointer to be what it was in user space.
5026 error = ipf_outobj(softc, data, fp, IPFOBJ_FRENTRY);
5029 if ((f->fr_dsize != 0) && (uptr != NULL))
5030 error = COPYOUT(f->fr_data, uptr,
5043 if (makecopy != 0) {
5045 KFREES(ptr, fp->fr_dsize);
5047 KFREES(fp, fp->fr_size);
5049 RWLOCK_EXIT(&softc->ipf_mutex);
5055 * At the end of this, ftail must point to the place where the
5056 * new rule is to be saved/inserted/added.
5057 * For SIOCAD*FR, this should be the last rule in the group of
5058 * rules that have equal fr_collect fields.
5059 * For SIOCIN*FR, ...
5061 if (req == (ioctlcmd_t)SIOCADAFR ||
5062 req == (ioctlcmd_t)SIOCADIFR) {
5064 for (ftail = fprev; (f = *ftail) != NULL; ) {
5065 if (f->fr_collect > fp->fr_collect)
5067 ftail = &f->fr_next;
5073 } else if (req == (ioctlcmd_t)SIOCINAFR ||
5074 req == (ioctlcmd_t)SIOCINIFR) {
5075 while ((f = *fprev) != NULL) {
5076 if (f->fr_collect >= fp->fr_collect)
5078 fprev = &f->fr_next;
5081 if (fp->fr_hits != 0) {
5082 while (fp->fr_hits && (f = *ftail)) {
5083 if (f->fr_collect != fp->fr_collect)
5086 ftail = &f->fr_next;
5096 * Request to remove a rule.
5104 * Do not allow activity from user space to interfere
5105 * with rules not loaded that way.
5107 if ((makecopy == 1) && !(f->fr_flags & FR_COPIED)) {
5114 * Return EBUSY if the rule is being reference by
5115 * something else (eg state information.)
5117 if (f->fr_ref > 1) {
5122 #ifdef IPFILTER_SCAN
5123 if (f->fr_isctag != -1 &&
5124 (f->fr_isc != (struct ipscan *)-1))
5125 ipf_scan_detachfr(f);
5128 if (unit == IPL_LOGAUTH) {
5129 error = ipf_auth_precmd(softc, req, f, ftail);
5133 ipf_rule_delete(softc, f, unit, set);
5135 need_free = makecopy;
5139 * Not removing, so we must be adding/inserting a rule.
5146 if (unit == IPL_LOGAUTH) {
5147 error = ipf_auth_precmd(softc, req, fp, ftail);
5151 MUTEX_NUKE(&fp->fr_lock);
5152 MUTEX_INIT(&fp->fr_lock, "filter rule lock");
5153 if (fp->fr_die != 0)
5154 ipf_rule_expire_insert(softc, fp, set);
5159 fp->fr_pnext = ftail;
5160 fp->fr_next = *ftail;
5161 if (fp->fr_next != NULL)
5162 fp->fr_next->fr_pnext = &fp->fr_next;
5165 ipf_fixskip(ftail, fp, 1);
5167 fp->fr_icmpgrp = NULL;
5168 if (fp->fr_icmphead != -1) {
5169 group = FR_NAME(fp, fr_icmphead);
5170 fg = ipf_group_add(softc, group, fp, 0, unit, set);
5171 fp->fr_icmpgrp = fg;
5174 fp->fr_grphead = NULL;
5175 if (fp->fr_grhead != -1) {
5176 group = FR_NAME(fp, fr_grhead);
5177 fg = ipf_group_add(softc, group, fp, fp->fr_flags,
5179 fp->fr_grphead = fg;
5183 RWLOCK_EXIT(&softc->ipf_mutex);
5185 if (need_free || (error != 0)) {
5186 if ((fp->fr_type & ~FR_T_BUILTIN) == FR_T_IPF) {
5187 if ((fp->fr_satype == FRI_LOOKUP) &&
5188 (fp->fr_srcptr != NULL))
5189 ipf_lookup_deref(softc, fp->fr_srctype,
5191 if ((fp->fr_datype == FRI_LOOKUP) &&
5192 (fp->fr_dstptr != NULL))
5193 ipf_lookup_deref(softc, fp->fr_dsttype,
5196 if (fp->fr_grp != NULL) {
5197 WRITE_ENTER(&softc->ipf_mutex);
5198 ipf_group_del(softc, fp->fr_grp, fp);
5199 RWLOCK_EXIT(&softc->ipf_mutex);
5201 if ((ptr != NULL) && (makecopy != 0)) {
5202 KFREES(ptr, fp->fr_dsize);
5204 KFREES(fp, fp->fr_size);
5210 /* ------------------------------------------------------------------------ */
5211 /* Function: ipf_rule_delete */
5213 /* Parameters: softc(I) - pointer to soft context main structure */
5214 /* f(I) - pointer to the rule being deleted */
5215 /* ftail(I) - pointer to the pointer to f */
5216 /* unit(I) - device for which this is for */
5217 /* set(I) - 1 or 0 (filter set) */
5219 /* This function attempts to do what it can to delete a filter rule: remove */
5220 /* it from any linked lists and remove any groups it is responsible for. */
5221 /* But in the end, removing a rule can only drop the reference count - we */
5222 /* must use that as the guide for whether or not it can be freed. */
5223 /* ------------------------------------------------------------------------ */
5225 ipf_rule_delete(softc, f, unit, set)
5226 ipf_main_softc_t *softc;
5232 * If fr_pdnext is set, then the rule is on the expire list, so
5233 * remove it from there.
5235 if (f->fr_pdnext != NULL) {
5236 *f->fr_pdnext = f->fr_dnext;
5237 if (f->fr_dnext != NULL)
5238 f->fr_dnext->fr_pdnext = f->fr_pdnext;
5239 f->fr_pdnext = NULL;
5243 ipf_fixskip(f->fr_pnext, f, -1);
5244 if (f->fr_pnext != NULL)
5245 *f->fr_pnext = f->fr_next;
5246 if (f->fr_next != NULL)
5247 f->fr_next->fr_pnext = f->fr_pnext;
5251 (void) ipf_derefrule(softc, &f);
5254 /* ------------------------------------------------------------------------ */
5255 /* Function: ipf_rule_expire_insert */
5257 /* Parameters: softc(I) - pointer to soft context main structure */
5258 /* f(I) - pointer to rule to be added to expire list */
5259 /* set(I) - 1 or 0 (filter set) */
5261 /* If the new rule has a given expiration time, insert it into the list of */
5262 /* expiring rules with the ones to be removed first added to the front of */
5263 /* the list. The insertion is O(n) but it is kept sorted for quick scans at */
5264 /* expiration interval checks. */
5265 /* ------------------------------------------------------------------------ */
5267 ipf_rule_expire_insert(softc, f, set)
5268 ipf_main_softc_t *softc;
5277 f->fr_die = softc->ipf_ticks + IPF_TTLVAL(f->fr_die);
5278 for (fr = softc->ipf_rule_explist[set]; fr != NULL;
5279 fr = fr->fr_dnext) {
5280 if (f->fr_die < fr->fr_die)
5282 if (fr->fr_dnext == NULL) {
5284 * We've got to the last rule and everything
5285 * wanted to be expired before this new node,
5286 * so we have to tack it on the end...
5289 f->fr_pdnext = &fr->fr_dnext;
5295 if (softc->ipf_rule_explist[set] == NULL) {
5296 softc->ipf_rule_explist[set] = f;
5297 f->fr_pdnext = &softc->ipf_rule_explist[set];
5298 } else if (fr != NULL) {
5300 f->fr_pdnext = fr->fr_pdnext;
5301 fr->fr_pdnext = &f->fr_dnext;
5306 /* ------------------------------------------------------------------------ */
5307 /* Function: ipf_findlookup */
5308 /* Returns: NULL = failure, else success */
5309 /* Parameters: softc(I) - pointer to soft context main structure */
5310 /* unit(I) - ipf device we want to find match for */
5311 /* fp(I) - rule for which lookup is for */
5312 /* addrp(I) - pointer to lookup information in address struct */
5313 /* maskp(O) - pointer to lookup information for storage */
5315 /* When using pools and hash tables to store addresses for matching in */
5316 /* rules, it is necessary to resolve both the object referred to by the */
5317 /* name or address (and return that pointer) and also provide the means by */
5318 /* which to determine if an address belongs to that object to make the */
5319 /* packet matching quicker. */
5320 /* ------------------------------------------------------------------------ */
5322 ipf_findlookup(softc, unit, fr, addrp, maskp)
5323 ipf_main_softc_t *softc;
5326 i6addr_t *addrp, *maskp;
5330 switch (addrp->iplookupsubtype)
5333 ptr = ipf_lookup_res_num(softc, unit, addrp->iplookuptype,
5335 &maskp->iplookupfunc);
5338 if (addrp->iplookupname < 0)
5340 if (addrp->iplookupname >= fr->fr_namelen)
5342 ptr = ipf_lookup_res_name(softc, unit, addrp->iplookuptype,
5343 fr->fr_names + addrp->iplookupname,
5344 &maskp->iplookupfunc);
5354 /* ------------------------------------------------------------------------ */
5355 /* Function: ipf_funcinit */
5356 /* Returns: int - 0 == success, else ESRCH: cannot resolve rule details */
5357 /* Parameters: softc(I) - pointer to soft context main structure */
5358 /* fr(I) - pointer to filter rule */
5360 /* If a rule is a call rule, then check if the function it points to needs */
5361 /* an init function to be called now the rule has been loaded. */
5362 /* ------------------------------------------------------------------------ */
5364 ipf_funcinit(softc, fr)
5365 ipf_main_softc_t *softc;
5368 ipfunc_resolve_t *ft;
5374 for (ft = ipf_availfuncs; ft->ipfu_addr != NULL; ft++)
5375 if (ft->ipfu_addr == fr->fr_func) {
5377 if (ft->ipfu_init != NULL)
5378 err = (*ft->ipfu_init)(softc, fr);
5385 /* ------------------------------------------------------------------------ */
5386 /* Function: ipf_funcfini */
5388 /* Parameters: softc(I) - pointer to soft context main structure */
5389 /* fr(I) - pointer to filter rule */
5391 /* For a given filter rule, call the matching "fini" function if the rule */
5392 /* is using a known function that would have resulted in the "init" being */
5393 /* called for ealier. */
5394 /* ------------------------------------------------------------------------ */
5396 ipf_funcfini(softc, fr)
5397 ipf_main_softc_t *softc;
5400 ipfunc_resolve_t *ft;
5402 for (ft = ipf_availfuncs; ft->ipfu_addr != NULL; ft++)
5403 if (ft->ipfu_addr == fr->fr_func) {
5404 if (ft->ipfu_fini != NULL)
5405 (void) (*ft->ipfu_fini)(softc, fr);
5411 /* ------------------------------------------------------------------------ */
5412 /* Function: ipf_findfunc */
5413 /* Returns: ipfunc_t - pointer to function if found, else NULL */
5414 /* Parameters: funcptr(I) - function pointer to lookup */
5416 /* Look for a function in the table of known functions. */
5417 /* ------------------------------------------------------------------------ */
5419 ipf_findfunc(funcptr)
5422 ipfunc_resolve_t *ft;
5424 for (ft = ipf_availfuncs; ft->ipfu_addr != NULL; ft++)
5425 if (ft->ipfu_addr == funcptr)
5431 /* ------------------------------------------------------------------------ */
5432 /* Function: ipf_resolvefunc */
5433 /* Returns: int - 0 == success, else error */
5434 /* Parameters: data(IO) - ioctl data pointer to ipfunc_resolve_t struct */
5436 /* Copy in a ipfunc_resolve_t structure and then fill in the missing field. */
5437 /* This will either be the function name (if the pointer is set) or the */
5438 /* function pointer if the name is set. When found, fill in the other one */
5439 /* so that the entire, complete, structure can be copied back to user space.*/
5440 /* ------------------------------------------------------------------------ */
5442 ipf_resolvefunc(softc, data)
5443 ipf_main_softc_t *softc;
5446 ipfunc_resolve_t res, *ft;
5449 error = BCOPYIN(data, &res, sizeof(res));
5455 if (res.ipfu_addr == NULL && res.ipfu_name[0] != '\0') {
5456 for (ft = ipf_availfuncs; ft->ipfu_addr != NULL; ft++)
5457 if (strncmp(res.ipfu_name, ft->ipfu_name,
5458 sizeof(res.ipfu_name)) == 0) {
5459 res.ipfu_addr = ft->ipfu_addr;
5460 res.ipfu_init = ft->ipfu_init;
5461 if (COPYOUT(&res, data, sizeof(res)) != 0) {
5468 if (res.ipfu_addr != NULL && res.ipfu_name[0] == '\0') {
5469 for (ft = ipf_availfuncs; ft->ipfu_addr != NULL; ft++)
5470 if (ft->ipfu_addr == res.ipfu_addr) {
5471 (void) strncpy(res.ipfu_name, ft->ipfu_name,
5472 sizeof(res.ipfu_name));
5473 res.ipfu_init = ft->ipfu_init;
5474 if (COPYOUT(&res, data, sizeof(res)) != 0) {
5486 #if !defined(_KERNEL) || (!defined(__NetBSD__) && !defined(__OpenBSD__) && \
5487 !defined(__FreeBSD__)) || \
5488 FREEBSD_LT_REV(501000) || NETBSD_LT_REV(105000000) || \
5489 OPENBSD_LT_REV(200006)
5492 * ppsratecheck(): packets (or events) per second limitation.
5495 ppsratecheck(lasttime, curpps, maxpps)
5496 struct timeval *lasttime;
5498 int maxpps; /* maximum pps allowed */
5500 struct timeval tv, delta;
5505 delta.tv_sec = tv.tv_sec - lasttime->tv_sec;
5506 delta.tv_usec = tv.tv_usec - lasttime->tv_usec;
5507 if (delta.tv_usec < 0) {
5509 delta.tv_usec += 1000000;
5513 * check for 0,0 is so that the message will be seen at least once.
5514 * if more than one second have passed since the last update of
5515 * lasttime, reset the counter.
5517 * we do increment *curpps even in *curpps < maxpps case, as some may
5518 * try to use *curpps for stat purposes as well.
5520 if ((lasttime->tv_sec == 0 && lasttime->tv_usec == 0) ||
5521 delta.tv_sec >= 1) {
5525 } else if (maxpps < 0)
5527 else if (*curpps < maxpps)
5531 *curpps = *curpps + 1;
5538 /* ------------------------------------------------------------------------ */
5539 /* Function: ipf_derefrule */
5540 /* Returns: int - 0 == rule freed up, else rule not freed */
5541 /* Parameters: fr(I) - pointer to filter rule */
5543 /* Decrement the reference counter to a rule by one. If it reaches zero, */
5544 /* free it and any associated storage space being used by it. */
5545 /* ------------------------------------------------------------------------ */
5547 ipf_derefrule(softc, frp)
5548 ipf_main_softc_t *softc;
5557 MUTEX_ENTER(&fr->fr_lock);
5559 if (fr->fr_ref == 0) {
5560 MUTEX_EXIT(&fr->fr_lock);
5561 MUTEX_DESTROY(&fr->fr_lock);
5563 ipf_funcfini(softc, fr);
5566 if (fdp->fd_type == FRD_DSTLIST)
5567 ipf_lookup_deref(softc, IPLT_DSTLIST, fdp->fd_ptr);
5570 if (fdp->fd_type == FRD_DSTLIST)
5571 ipf_lookup_deref(softc, IPLT_DSTLIST, fdp->fd_ptr);
5574 if (fdp->fd_type == FRD_DSTLIST)
5575 ipf_lookup_deref(softc, IPLT_DSTLIST, fdp->fd_ptr);
5577 if ((fr->fr_type & ~FR_T_BUILTIN) == FR_T_IPF &&
5578 fr->fr_satype == FRI_LOOKUP)
5579 ipf_lookup_deref(softc, fr->fr_srctype, fr->fr_srcptr);
5580 if ((fr->fr_type & ~FR_T_BUILTIN) == FR_T_IPF &&
5581 fr->fr_datype == FRI_LOOKUP)
5582 ipf_lookup_deref(softc, fr->fr_dsttype, fr->fr_dstptr);
5584 if (fr->fr_grp != NULL)
5585 ipf_group_del(softc, fr->fr_grp, fr);
5587 if (fr->fr_grphead != NULL)
5588 ipf_group_del(softc, fr->fr_grphead, fr);
5590 if (fr->fr_icmpgrp != NULL)
5591 ipf_group_del(softc, fr->fr_icmpgrp, fr);
5593 if ((fr->fr_flags & FR_COPIED) != 0) {
5595 KFREES(fr->fr_data, fr->fr_dsize);
5597 KFREES(fr, fr->fr_size);
5602 MUTEX_EXIT(&fr->fr_lock);
5608 /* ------------------------------------------------------------------------ */
5609 /* Function: ipf_grpmapinit */
5610 /* Returns: int - 0 == success, else ESRCH because table entry not found*/
5611 /* Parameters: fr(I) - pointer to rule to find hash table for */
5613 /* Looks for group hash table fr_arg and stores a pointer to it in fr_ptr. */
5614 /* fr_ptr is later used by ipf_srcgrpmap and ipf_dstgrpmap. */
5615 /* ------------------------------------------------------------------------ */
5617 ipf_grpmapinit(softc, fr)
5618 ipf_main_softc_t *softc;
5621 char name[FR_GROUPLEN];
5624 #if defined(SNPRINTF) && defined(_KERNEL)
5625 SNPRINTF(name, sizeof(name), "%d", fr->fr_arg);
5627 (void) sprintf(name, "%d", fr->fr_arg);
5629 iph = ipf_lookup_find_htable(softc, IPL_LOGIPF, name);
5634 if ((iph->iph_flags & FR_INOUT) != (fr->fr_flags & FR_INOUT)) {
5644 /* ------------------------------------------------------------------------ */
5645 /* Function: ipf_grpmapfini */
5646 /* Returns: int - 0 == success, else ESRCH because table entry not found*/
5647 /* Parameters: softc(I) - pointer to soft context main structure */
5648 /* fr(I) - pointer to rule to release hash table for */
5650 /* For rules that have had ipf_grpmapinit called, ipf_lookup_deref needs to */
5651 /* be called to undo what ipf_grpmapinit caused to be done. */
5652 /* ------------------------------------------------------------------------ */
5654 ipf_grpmapfini(softc, fr)
5655 ipf_main_softc_t *softc;
5661 ipf_lookup_deref(softc, IPLT_HASH, iph);
5666 /* ------------------------------------------------------------------------ */
5667 /* Function: ipf_srcgrpmap */
5668 /* Returns: frentry_t * - pointer to "new last matching" rule or NULL */
5669 /* Parameters: fin(I) - pointer to packet information */
5670 /* passp(IO) - pointer to current/new filter decision (unused) */
5672 /* Look for a rule group head in a hash table, using the source address as */
5673 /* the key, and descend into that group and continue matching rules against */
5675 /* ------------------------------------------------------------------------ */
5677 ipf_srcgrpmap(fin, passp)
5684 rval = ipf_iphmfindgroup(fin->fin_main_soft, fin->fin_fr->fr_ptr,
5690 fin->fin_fr = fg->fg_start;
5691 (void) ipf_scanlist(fin, *passp);
5696 /* ------------------------------------------------------------------------ */
5697 /* Function: ipf_dstgrpmap */
5698 /* Returns: frentry_t * - pointer to "new last matching" rule or NULL */
5699 /* Parameters: fin(I) - pointer to packet information */
5700 /* passp(IO) - pointer to current/new filter decision (unused) */
5702 /* Look for a rule group head in a hash table, using the destination */
5703 /* address as the key, and descend into that group and continue matching */
5704 /* rules against the packet. */
5705 /* ------------------------------------------------------------------------ */
5707 ipf_dstgrpmap(fin, passp)
5714 rval = ipf_iphmfindgroup(fin->fin_main_soft, fin->fin_fr->fr_ptr,
5720 fin->fin_fr = fg->fg_start;
5721 (void) ipf_scanlist(fin, *passp);
5728 * These functions manage objects on queues for efficient timeouts. There
5729 * are a number of system defined queues as well as user defined timeouts.
5730 * It is expected that a lock is held in the domain in which the queue
5731 * belongs (i.e. either state or NAT) when calling any of these functions
5732 * that prevents ipf_freetimeoutqueue() from being called at the same time
5737 /* ------------------------------------------------------------------------ */
5738 /* Function: ipf_addtimeoutqueue */
5739 /* Returns: struct ifqtq * - NULL if malloc fails, else pointer to */
5740 /* timeout queue with given interval. */
5741 /* Parameters: parent(I) - pointer to pointer to parent node of this list */
5742 /* of interface queues. */
5743 /* seconds(I) - timeout value in seconds for this queue. */
5745 /* This routine first looks for a timeout queue that matches the interval */
5746 /* being requested. If it finds one, increments the reference counter and */
5747 /* returns a pointer to it. If none are found, it allocates a new one and */
5748 /* inserts it at the top of the list. */
5751 /* It is assumed that the caller of this function has an appropriate lock */
5752 /* held (exclusively) in the domain that encompases 'parent'. */
5753 /* ------------------------------------------------------------------------ */
5755 ipf_addtimeoutqueue(softc, parent, seconds)
5756 ipf_main_softc_t *softc;
5763 period = seconds * IPF_HZ_DIVIDE;
5765 MUTEX_ENTER(&softc->ipf_timeoutlock);
5766 for (ifq = *parent; ifq != NULL; ifq = ifq->ifq_next) {
5767 if (ifq->ifq_ttl == period) {
5769 * Reset the delete flag, if set, so the structure
5770 * gets reused rather than freed and reallocated.
5772 MUTEX_ENTER(&ifq->ifq_lock);
5773 ifq->ifq_flags &= ~IFQF_DELETE;
5775 MUTEX_EXIT(&ifq->ifq_lock);
5776 MUTEX_EXIT(&softc->ipf_timeoutlock);
5782 KMALLOC(ifq, ipftq_t *);
5784 MUTEX_NUKE(&ifq->ifq_lock);
5785 IPFTQ_INIT(ifq, period, "ipftq mutex");
5786 ifq->ifq_next = *parent;
5787 ifq->ifq_pnext = parent;
5788 ifq->ifq_flags = IFQF_USER;
5791 softc->ipf_userifqs++;
5793 MUTEX_EXIT(&softc->ipf_timeoutlock);
5798 /* ------------------------------------------------------------------------ */
5799 /* Function: ipf_deletetimeoutqueue */
5800 /* Returns: int - new reference count value of the timeout queue */
5801 /* Parameters: ifq(I) - timeout queue which is losing a reference. */
5802 /* Locks: ifq->ifq_lock */
5804 /* This routine must be called when we're discarding a pointer to a timeout */
5805 /* queue object, taking care of the reference counter. */
5807 /* Now that this just sets a DELETE flag, it requires the expire code to */
5808 /* check the list of user defined timeout queues and call the free function */
5809 /* below (currently commented out) to stop memory leaking. It is done this */
5810 /* way because the locking may not be sufficient to safely do a free when */
5811 /* this function is called. */
5812 /* ------------------------------------------------------------------------ */
5814 ipf_deletetimeoutqueue(ifq)
5819 if ((ifq->ifq_ref == 0) && ((ifq->ifq_flags & IFQF_USER) != 0)) {
5820 ifq->ifq_flags |= IFQF_DELETE;
5823 return ifq->ifq_ref;
5827 /* ------------------------------------------------------------------------ */
5828 /* Function: ipf_freetimeoutqueue */
5829 /* Parameters: ifq(I) - timeout queue which is losing a reference. */
5833 /* It is assumed that the caller of this function has an appropriate lock */
5834 /* held (exclusively) in the domain that encompases the callers "domain". */
5835 /* The ifq_lock for this structure should not be held. */
5837 /* Remove a user defined timeout queue from the list of queues it is in and */
5838 /* tidy up after this is done. */
5839 /* ------------------------------------------------------------------------ */
5841 ipf_freetimeoutqueue(softc, ifq)
5842 ipf_main_softc_t *softc;
5846 if (((ifq->ifq_flags & IFQF_DELETE) == 0) || (ifq->ifq_ref != 0) ||
5847 ((ifq->ifq_flags & IFQF_USER) == 0)) {
5848 printf("ipf_freetimeoutqueue(%lx) flags 0x%x ttl %d ref %d\n",
5849 (u_long)ifq, ifq->ifq_flags, ifq->ifq_ttl,
5855 * Remove from its position in the list.
5857 *ifq->ifq_pnext = ifq->ifq_next;
5858 if (ifq->ifq_next != NULL)
5859 ifq->ifq_next->ifq_pnext = ifq->ifq_pnext;
5860 ifq->ifq_next = NULL;
5861 ifq->ifq_pnext = NULL;
5863 MUTEX_DESTROY(&ifq->ifq_lock);
5864 ATOMIC_DEC(softc->ipf_userifqs);
5869 /* ------------------------------------------------------------------------ */
5870 /* Function: ipf_deletequeueentry */
5872 /* Parameters: tqe(I) - timeout queue entry to delete */
5874 /* Remove a tail queue entry from its queue and make it an orphan. */
5875 /* ipf_deletetimeoutqueue is called to make sure the reference count on the */
5876 /* queue is correct. We can't, however, call ipf_freetimeoutqueue because */
5877 /* the correct lock(s) may not be held that would make it safe to do so. */
5878 /* ------------------------------------------------------------------------ */
5880 ipf_deletequeueentry(tqe)
5887 MUTEX_ENTER(&ifq->ifq_lock);
5889 if (tqe->tqe_pnext != NULL) {
5890 *tqe->tqe_pnext = tqe->tqe_next;
5891 if (tqe->tqe_next != NULL)
5892 tqe->tqe_next->tqe_pnext = tqe->tqe_pnext;
5893 else /* we must be the tail anyway */
5894 ifq->ifq_tail = tqe->tqe_pnext;
5896 tqe->tqe_pnext = NULL;
5897 tqe->tqe_ifq = NULL;
5900 (void) ipf_deletetimeoutqueue(ifq);
5901 ASSERT(ifq->ifq_ref > 0);
5903 MUTEX_EXIT(&ifq->ifq_lock);
5907 /* ------------------------------------------------------------------------ */
5908 /* Function: ipf_queuefront */
5910 /* Parameters: tqe(I) - pointer to timeout queue entry */
5912 /* Move a queue entry to the front of the queue, if it isn't already there. */
5913 /* ------------------------------------------------------------------------ */
5924 MUTEX_ENTER(&ifq->ifq_lock);
5925 if (ifq->ifq_head != tqe) {
5926 *tqe->tqe_pnext = tqe->tqe_next;
5928 tqe->tqe_next->tqe_pnext = tqe->tqe_pnext;
5930 ifq->ifq_tail = tqe->tqe_pnext;
5932 tqe->tqe_next = ifq->ifq_head;
5933 ifq->ifq_head->tqe_pnext = &tqe->tqe_next;
5934 ifq->ifq_head = tqe;
5935 tqe->tqe_pnext = &ifq->ifq_head;
5937 MUTEX_EXIT(&ifq->ifq_lock);
5941 /* ------------------------------------------------------------------------ */
5942 /* Function: ipf_queueback */
5944 /* Parameters: ticks(I) - ipf tick time to use with this call */
5945 /* tqe(I) - pointer to timeout queue entry */
5947 /* Move a queue entry to the back of the queue, if it isn't already there. */
5948 /* We use use ticks to calculate the expiration and mark for when we last */
5949 /* touched the structure. */
5950 /* ------------------------------------------------------------------------ */
5952 ipf_queueback(ticks, tqe)
5961 tqe->tqe_die = ticks + ifq->ifq_ttl;
5962 tqe->tqe_touched = ticks;
5964 MUTEX_ENTER(&ifq->ifq_lock);
5965 if (tqe->tqe_next != NULL) { /* at the end already ? */
5969 *tqe->tqe_pnext = tqe->tqe_next;
5970 tqe->tqe_next->tqe_pnext = tqe->tqe_pnext;
5973 * Make it the last entry.
5975 tqe->tqe_next = NULL;
5976 tqe->tqe_pnext = ifq->ifq_tail;
5977 *ifq->ifq_tail = tqe;
5978 ifq->ifq_tail = &tqe->tqe_next;
5980 MUTEX_EXIT(&ifq->ifq_lock);
5984 /* ------------------------------------------------------------------------ */
5985 /* Function: ipf_queueappend */
5987 /* Parameters: ticks(I) - ipf tick time to use with this call */
5988 /* tqe(I) - pointer to timeout queue entry */
5989 /* ifq(I) - pointer to timeout queue */
5990 /* parent(I) - owing object pointer */
5992 /* Add a new item to this queue and put it on the very end. */
5993 /* We use use ticks to calculate the expiration and mark for when we last */
5994 /* touched the structure. */
5995 /* ------------------------------------------------------------------------ */
5997 ipf_queueappend(ticks, tqe, ifq, parent)
6004 MUTEX_ENTER(&ifq->ifq_lock);
6005 tqe->tqe_parent = parent;
6006 tqe->tqe_pnext = ifq->ifq_tail;
6007 *ifq->ifq_tail = tqe;
6008 ifq->ifq_tail = &tqe->tqe_next;
6009 tqe->tqe_next = NULL;
6011 tqe->tqe_die = ticks + ifq->ifq_ttl;
6012 tqe->tqe_touched = ticks;
6014 MUTEX_EXIT(&ifq->ifq_lock);
6018 /* ------------------------------------------------------------------------ */
6019 /* Function: ipf_movequeue */
6021 /* Parameters: tq(I) - pointer to timeout queue information */
6022 /* oifp(I) - old timeout queue entry was on */
6023 /* nifp(I) - new timeout queue to put entry on */
6025 /* Move a queue entry from one timeout queue to another timeout queue. */
6026 /* If it notices that the current entry is already last and does not need */
6027 /* to move queue, the return. */
6028 /* ------------------------------------------------------------------------ */
6030 ipf_movequeue(ticks, tqe, oifq, nifq)
6033 ipftq_t *oifq, *nifq;
6037 * If the queue hasn't changed and we last touched this entry at the
6038 * same ipf time, then we're not going to achieve anything by either
6039 * changing the ttl or moving it on the queue.
6041 if (oifq == nifq && tqe->tqe_touched == ticks)
6045 * For any of this to be outside the lock, there is a risk that two
6046 * packets entering simultaneously, with one changing to a different
6047 * queue and one not, could end up with things in a bizarre state.
6049 MUTEX_ENTER(&oifq->ifq_lock);
6051 tqe->tqe_touched = ticks;
6052 tqe->tqe_die = ticks + nifq->ifq_ttl;
6054 * Is the operation here going to be a no-op ?
6057 if ((tqe->tqe_next == NULL) ||
6058 (tqe->tqe_next->tqe_die == tqe->tqe_die)) {
6059 MUTEX_EXIT(&oifq->ifq_lock);
6065 * Remove from the old queue
6067 *tqe->tqe_pnext = tqe->tqe_next;
6069 tqe->tqe_next->tqe_pnext = tqe->tqe_pnext;
6071 oifq->ifq_tail = tqe->tqe_pnext;
6072 tqe->tqe_next = NULL;
6075 * If we're moving from one queue to another, release the
6076 * lock on the old queue and get a lock on the new queue.
6077 * For user defined queues, if we're moving off it, call
6078 * delete in case it can now be freed.
6081 tqe->tqe_ifq = NULL;
6083 (void) ipf_deletetimeoutqueue(oifq);
6085 MUTEX_EXIT(&oifq->ifq_lock);
6087 MUTEX_ENTER(&nifq->ifq_lock);
6089 tqe->tqe_ifq = nifq;
6094 * Add to the bottom of the new queue
6096 tqe->tqe_pnext = nifq->ifq_tail;
6097 *nifq->ifq_tail = tqe;
6098 nifq->ifq_tail = &tqe->tqe_next;
6099 MUTEX_EXIT(&nifq->ifq_lock);
6103 /* ------------------------------------------------------------------------ */
6104 /* Function: ipf_updateipid */
6105 /* Returns: int - 0 == success, -1 == error (packet should be droppped) */
6106 /* Parameters: fin(I) - pointer to packet information */
6108 /* When we are doing NAT, change the IP of every packet to represent a */
6109 /* single sequence of packets coming from the host, hiding any host */
6110 /* specific sequencing that might otherwise be revealed. If the packet is */
6111 /* a fragment, then store the 'new' IPid in the fragment cache and look up */
6112 /* the fragment cache for non-leading fragments. If a non-leading fragment */
6113 /* has no match in the cache, return an error. */
6114 /* ------------------------------------------------------------------------ */
6119 u_short id, ido, sums;
6124 ido = ntohs(ip->ip_id);
6125 if (fin->fin_off != 0) {
6126 sum = ipf_frag_ipidknown(fin);
6127 if (sum == 0xffffffff)
6131 ip->ip_id = htons(id);
6134 id = ntohs(ip->ip_id);
6135 if ((fin->fin_flx & FI_FRAG) != 0)
6136 (void) ipf_frag_ipidnew(fin, (u_32_t)id);
6141 CALC_SUMD(ido, id, sumd); /* DESTRUCTIVE MACRO! id,ido change */
6142 sum = (~ntohs(ip->ip_sum)) & 0xffff;
6144 sum = (sum >> 16) + (sum & 0xffff);
6145 sum = (sum >> 16) + (sum & 0xffff);
6146 sums = ~(u_short)sum;
6147 ip->ip_sum = htons(sums);
6152 #ifdef NEED_FRGETIFNAME
6153 /* ------------------------------------------------------------------------ */
6154 /* Function: ipf_getifname */
6155 /* Returns: char * - pointer to interface name */
6156 /* Parameters: ifp(I) - pointer to network interface */
6157 /* buffer(O) - pointer to where to store interface name */
6159 /* Constructs an interface name in the buffer passed. The buffer passed is */
6160 /* expected to be at least LIFNAMSIZ in bytes big. If buffer is passed in */
6161 /* as a NULL pointer then return a pointer to a static array. */
6162 /* ------------------------------------------------------------------------ */
6164 ipf_getifname(ifp, buffer)
6168 static char namebuf[LIFNAMSIZ];
6169 # if defined(MENTAT) || defined(__FreeBSD__) || defined(__osf__) || \
6170 defined(__sgi) || defined(linux) || defined(_AIX51) || \
6171 (defined(sun) && !defined(__SVR4) && !defined(__svr4__))
6179 (void) strncpy(buffer, ifp->if_name, LIFNAMSIZ);
6180 buffer[LIFNAMSIZ - 1] = '\0';
6181 # if defined(MENTAT) || defined(__FreeBSD__) || defined(__osf__) || \
6182 defined(__sgi) || defined(_AIX51) || \
6183 (defined(sun) && !defined(__SVR4) && !defined(__svr4__))
6184 for (s = buffer; *s; s++)
6186 unit = ifp->if_unit;
6187 space = LIFNAMSIZ - (s - buffer);
6188 if ((space > 0) && (unit >= 0)) {
6189 # if defined(SNPRINTF) && defined(_KERNEL)
6190 SNPRINTF(temp, sizeof(temp), "%d", unit);
6192 (void) sprintf(temp, "%d", unit);
6194 (void) strncpy(s, temp, space);
6202 /* ------------------------------------------------------------------------ */
6203 /* Function: ipf_ioctlswitch */
6204 /* Returns: int - -1 continue processing, else ioctl return value */
6205 /* Parameters: unit(I) - device unit opened */
6206 /* data(I) - pointer to ioctl data */
6207 /* cmd(I) - ioctl command */
6208 /* mode(I) - mode value */
6209 /* uid(I) - uid making the ioctl call */
6210 /* ctx(I) - pointer to context data */
6212 /* Based on the value of unit, call the appropriate ioctl handler or return */
6213 /* EIO if ipfilter is not running. Also checks if write perms are req'd */
6214 /* for the device in order to execute the ioctl. A special case is made */
6215 /* SIOCIPFINTERROR so that the same code isn't required in every handler. */
6216 /* The context data pointer is passed through as this is used as the key */
6217 /* for locating a matching token for continued access for walking lists, */
6219 /* ------------------------------------------------------------------------ */
6221 ipf_ioctlswitch(softc, unit, data, cmd, mode, uid, ctx)
6222 ipf_main_softc_t *softc;
6223 int unit, mode, uid;
6231 case SIOCIPFINTERROR :
6232 error = BCOPYOUT(&softc->ipf_interror, data,
6233 sizeof(softc->ipf_interror));
6246 error = ipf_ipf_ioctl(softc, data, cmd, mode, uid, ctx);
6249 if (softc->ipf_running > 0) {
6250 error = ipf_nat_ioctl(softc, data, cmd, mode,
6258 if (softc->ipf_running > 0) {
6259 error = ipf_state_ioctl(softc, data, cmd, mode,
6267 if (softc->ipf_running > 0) {
6268 error = ipf_auth_ioctl(softc, data, cmd, mode,
6276 if (softc->ipf_running > 0) {
6277 error = ipf_sync_ioctl(softc, data, cmd, mode,
6285 #ifdef IPFILTER_SCAN
6286 if (softc->ipf_running > 0)
6287 error = ipf_scan_ioctl(softc, data, cmd, mode,
6296 case IPL_LOGLOOKUP :
6297 if (softc->ipf_running > 0) {
6298 error = ipf_lookup_ioctl(softc, data, cmd, mode,
6316 * This array defines the expected size of objects coming into the kernel
6317 * for the various recognised object types. The first column is flags (see
6318 * below), 2nd column is current size, 3rd column is the version number of
6319 * when the current size became current.
6321 * 1 = minimum size, not absolute size
6323 static int ipf_objbytes[IPFOBJ_COUNT][3] = {
6324 { 1, sizeof(struct frentry), 5010000 }, /* 0 */
6325 { 1, sizeof(struct friostat), 5010000 },
6326 { 0, sizeof(struct fr_info), 5010000 },
6327 { 0, sizeof(struct ipf_authstat), 4010100 },
6328 { 0, sizeof(struct ipfrstat), 5010000 },
6329 { 1, sizeof(struct ipnat), 5010000 }, /* 5 */
6330 { 0, sizeof(struct natstat), 5010000 },
6331 { 0, sizeof(struct ipstate_save), 5010000 },
6332 { 1, sizeof(struct nat_save), 5010000 },
6333 { 0, sizeof(struct natlookup), 5010000 },
6334 { 1, sizeof(struct ipstate), 5010000 }, /* 10 */
6335 { 0, sizeof(struct ips_stat), 5010000 },
6336 { 0, sizeof(struct frauth), 5010000 },
6337 { 0, sizeof(struct ipftune), 4010100 },
6338 { 0, sizeof(struct nat), 5010000 },
6339 { 0, sizeof(struct ipfruleiter), 4011400 }, /* 15 */
6340 { 0, sizeof(struct ipfgeniter), 4011400 },
6341 { 0, sizeof(struct ipftable), 4011400 },
6342 { 0, sizeof(struct ipflookupiter), 4011400 },
6343 { 0, sizeof(struct ipftq) * IPF_TCP_NSTATES },
6344 { 1, 0, 0 }, /* IPFEXPR */
6345 { 0, 0, 0 }, /* PROXYCTL */
6346 { 0, sizeof (struct fripf), 5010000 }
6350 /* ------------------------------------------------------------------------ */
6351 /* Function: ipf_inobj */
6352 /* Returns: int - 0 = success, else failure */
6353 /* Parameters: softc(I) - soft context pointerto work with */
6354 /* data(I) - pointer to ioctl data */
6355 /* objp(O) - where to store ipfobj structure */
6356 /* ptr(I) - pointer to data to copy out */
6357 /* type(I) - type of structure being moved */
6359 /* Copy in the contents of what the ipfobj_t points to. In future, we */
6360 /* add things to check for version numbers, sizes, etc, to make it backward */
6361 /* compatible at the ABI for user land. */
6362 /* If objp is not NULL then we assume that the caller wants to see what is */
6363 /* in the ipfobj_t structure being copied in. As an example, this can tell */
6364 /* the caller what version of ipfilter the ioctl program was written to. */
6365 /* ------------------------------------------------------------------------ */
6367 ipf_inobj(softc, data, objp, ptr, type)
6368 ipf_main_softc_t *softc;
6378 if ((type < 0) || (type >= IPFOBJ_COUNT)) {
6385 error = BCOPYIN(data, objp, sizeof(*objp));
6391 if (objp->ipfo_type != type) {
6396 if (objp->ipfo_rev >= ipf_objbytes[type][2]) {
6397 if ((ipf_objbytes[type][0] & 1) != 0) {
6398 if (objp->ipfo_size < ipf_objbytes[type][1]) {
6402 size = ipf_objbytes[type][1];
6403 } else if (objp->ipfo_size == ipf_objbytes[type][1]) {
6404 size = objp->ipfo_size;
6409 error = COPYIN(objp->ipfo_ptr, ptr, size);
6415 #ifdef IPFILTER_COMPAT
6416 error = ipf_in_compat(softc, objp, ptr, 0);
6426 /* ------------------------------------------------------------------------ */
6427 /* Function: ipf_inobjsz */
6428 /* Returns: int - 0 = success, else failure */
6429 /* Parameters: softc(I) - soft context pointerto work with */
6430 /* data(I) - pointer to ioctl data */
6431 /* ptr(I) - pointer to store real data in */
6432 /* type(I) - type of structure being moved */
6433 /* sz(I) - size of data to copy */
6435 /* As per ipf_inobj, except the size of the object to copy in is passed in */
6436 /* but it must not be smaller than the size defined for the type and the */
6437 /* type must allow for varied sized objects. The extra requirement here is */
6438 /* that sz must match the size of the object being passed in - this is not */
6439 /* not possible nor required in ipf_inobj(). */
6440 /* ------------------------------------------------------------------------ */
6442 ipf_inobjsz(softc, data, ptr, type, sz)
6443 ipf_main_softc_t *softc;
6451 if ((type < 0) || (type >= IPFOBJ_COUNT)) {
6456 error = BCOPYIN(data, &obj, sizeof(obj));
6462 if (obj.ipfo_type != type) {
6467 if (obj.ipfo_rev >= ipf_objbytes[type][2]) {
6468 if (((ipf_objbytes[type][0] & 1) == 0) ||
6469 (sz < ipf_objbytes[type][1])) {
6473 error = COPYIN(obj.ipfo_ptr, ptr, sz);
6479 #ifdef IPFILTER_COMPAT
6480 error = ipf_in_compat(softc, &obj, ptr, sz);
6490 /* ------------------------------------------------------------------------ */
6491 /* Function: ipf_outobjsz */
6492 /* Returns: int - 0 = success, else failure */
6493 /* Parameters: data(I) - pointer to ioctl data */
6494 /* ptr(I) - pointer to store real data in */
6495 /* type(I) - type of structure being moved */
6496 /* sz(I) - size of data to copy */
6498 /* As per ipf_outobj, except the size of the object to copy out is passed in*/
6499 /* but it must not be smaller than the size defined for the type and the */
6500 /* type must allow for varied sized objects. The extra requirement here is */
6501 /* that sz must match the size of the object being passed in - this is not */
6502 /* not possible nor required in ipf_outobj(). */
6503 /* ------------------------------------------------------------------------ */
6505 ipf_outobjsz(softc, data, ptr, type, sz)
6506 ipf_main_softc_t *softc;
6514 if ((type < 0) || (type >= IPFOBJ_COUNT)) {
6519 error = BCOPYIN(data, &obj, sizeof(obj));
6525 if (obj.ipfo_type != type) {
6530 if (obj.ipfo_rev >= ipf_objbytes[type][2]) {
6531 if (((ipf_objbytes[type][0] & 1) == 0) ||
6532 (sz < ipf_objbytes[type][1])) {
6536 error = COPYOUT(ptr, obj.ipfo_ptr, sz);
6542 #ifdef IPFILTER_COMPAT
6543 error = ipf_out_compat(softc, &obj, ptr);
6553 /* ------------------------------------------------------------------------ */
6554 /* Function: ipf_outobj */
6555 /* Returns: int - 0 = success, else failure */
6556 /* Parameters: data(I) - pointer to ioctl data */
6557 /* ptr(I) - pointer to store real data in */
6558 /* type(I) - type of structure being moved */
6560 /* Copy out the contents of what ptr is to where ipfobj points to. In */
6561 /* future, we add things to check for version numbers, sizes, etc, to make */
6562 /* it backward compatible at the ABI for user land. */
6563 /* ------------------------------------------------------------------------ */
6565 ipf_outobj(softc, data, ptr, type)
6566 ipf_main_softc_t *softc;
6574 if ((type < 0) || (type >= IPFOBJ_COUNT)) {
6579 error = BCOPYIN(data, &obj, sizeof(obj));
6585 if (obj.ipfo_type != type) {
6590 if (obj.ipfo_rev >= ipf_objbytes[type][2]) {
6591 if ((ipf_objbytes[type][0] & 1) != 0) {
6592 if (obj.ipfo_size < ipf_objbytes[type][1]) {
6596 } else if (obj.ipfo_size != ipf_objbytes[type][1]) {
6601 error = COPYOUT(ptr, obj.ipfo_ptr, obj.ipfo_size);
6607 #ifdef IPFILTER_COMPAT
6608 error = ipf_out_compat(softc, &obj, ptr);
6618 /* ------------------------------------------------------------------------ */
6619 /* Function: ipf_outobjk */
6620 /* Returns: int - 0 = success, else failure */
6621 /* Parameters: obj(I) - pointer to data description structure */
6622 /* ptr(I) - pointer to kernel data to copy out */
6624 /* In the above functions, the ipfobj_t structure is copied into the kernel,*/
6625 /* telling ipfilter how to copy out data. In this instance, the ipfobj_t is */
6626 /* already populated with information and now we just need to use it. */
6627 /* There is no need for this function to have a "type" parameter as there */
6628 /* is no point in validating information that comes from the kernel with */
6630 /* ------------------------------------------------------------------------ */
6632 ipf_outobjk(softc, obj, ptr)
6633 ipf_main_softc_t *softc;
6637 int type = obj->ipfo_type;
6640 if ((type < 0) || (type >= IPFOBJ_COUNT)) {
6645 if (obj->ipfo_rev >= ipf_objbytes[type][2]) {
6646 if ((ipf_objbytes[type][0] & 1) != 0) {
6647 if (obj->ipfo_size < ipf_objbytes[type][1]) {
6652 } else if (obj->ipfo_size != ipf_objbytes[type][1]) {
6657 error = COPYOUT(ptr, obj->ipfo_ptr, obj->ipfo_size);
6663 #ifdef IPFILTER_COMPAT
6664 error = ipf_out_compat(softc, obj, ptr);
6674 /* ------------------------------------------------------------------------ */
6675 /* Function: ipf_checkl4sum */
6676 /* Returns: int - 0 = good, -1 = bad, 1 = cannot check */
6677 /* Parameters: fin(I) - pointer to packet information */
6679 /* If possible, calculate the layer 4 checksum for the packet. If this is */
6680 /* not possible, return without indicating a failure or success but in a */
6681 /* way that is ditinguishable. This function should only be called by the */
6682 /* ipf_checkv6sum() for each platform. */
6683 /* ------------------------------------------------------------------------ */
6688 u_short sum, hdrsum, *csump;
6693 * If the TCP packet isn't a fragment, isn't too short and otherwise
6694 * isn't already considered "bad", then validate the checksum. If
6695 * this check fails then considered the packet to be "bad".
6697 if ((fin->fin_flx & (FI_FRAG|FI_SHORT|FI_BAD)) != 0)
6708 csump = &((tcphdr_t *)fin->fin_dp)->th_sum;
6714 if (udp->uh_sum != 0) {
6715 csump = &udp->uh_sum;
6721 case IPPROTO_ICMPV6 :
6722 csump = &((struct icmp6_hdr *)fin->fin_dp)->icmp6_cksum;
6728 csump = &((struct icmp *)fin->fin_dp)->icmp_cksum;
6741 sum = fr_cksum(fin, fin->fin_ip, fin->fin_p, fin->fin_dp);
6743 #if !defined(_KERNEL)
6744 if (sum == hdrsum) {
6745 FR_DEBUG(("checkl4sum: %hx == %hx\n", sum, hdrsum));
6747 FR_DEBUG(("checkl4sum: %hx != %hx\n", sum, hdrsum));
6750 DT2(l4sums, u_short, hdrsum, u_short, sum);
6751 if (hdrsum == sum) {
6752 fin->fin_cksum = FI_CK_SUMOK;
6755 fin->fin_cksum = FI_CK_BAD;
6760 /* ------------------------------------------------------------------------ */
6761 /* Function: ipf_ifpfillv4addr */
6762 /* Returns: int - 0 = address update, -1 = address not updated */
6763 /* Parameters: atype(I) - type of network address update to perform */
6764 /* sin(I) - pointer to source of address information */
6765 /* mask(I) - pointer to source of netmask information */
6766 /* inp(I) - pointer to destination address store */
6767 /* inpmask(I) - pointer to destination netmask store */
6769 /* Given a type of network address update (atype) to perform, copy */
6770 /* information from sin/mask into inp/inpmask. If ipnmask is NULL then no */
6771 /* netmask update is performed unless FRI_NETMASKED is passed as atype, in */
6772 /* which case the operation fails. For all values of atype other than */
6773 /* FRI_NETMASKED, if inpmask is non-NULL then the mask is set to an all 1s */
6775 /* ------------------------------------------------------------------------ */
6777 ipf_ifpfillv4addr(atype, sin, mask, inp, inpmask)
6779 struct sockaddr_in *sin, *mask;
6780 struct in_addr *inp, *inpmask;
6782 if (inpmask != NULL && atype != FRI_NETMASKED)
6783 inpmask->s_addr = 0xffffffff;
6785 if (atype == FRI_NETWORK || atype == FRI_NETMASKED) {
6786 if (atype == FRI_NETMASKED) {
6787 if (inpmask == NULL)
6789 inpmask->s_addr = mask->sin_addr.s_addr;
6791 inp->s_addr = sin->sin_addr.s_addr & mask->sin_addr.s_addr;
6793 inp->s_addr = sin->sin_addr.s_addr;
6800 /* ------------------------------------------------------------------------ */
6801 /* Function: ipf_ifpfillv6addr */
6802 /* Returns: int - 0 = address update, -1 = address not updated */
6803 /* Parameters: atype(I) - type of network address update to perform */
6804 /* sin(I) - pointer to source of address information */
6805 /* mask(I) - pointer to source of netmask information */
6806 /* inp(I) - pointer to destination address store */
6807 /* inpmask(I) - pointer to destination netmask store */
6809 /* Given a type of network address update (atype) to perform, copy */
6810 /* information from sin/mask into inp/inpmask. If ipnmask is NULL then no */
6811 /* netmask update is performed unless FRI_NETMASKED is passed as atype, in */
6812 /* which case the operation fails. For all values of atype other than */
6813 /* FRI_NETMASKED, if inpmask is non-NULL then the mask is set to an all 1s */
6815 /* ------------------------------------------------------------------------ */
6817 ipf_ifpfillv6addr(atype, sin, mask, inp, inpmask)
6819 struct sockaddr_in6 *sin, *mask;
6820 i6addr_t *inp, *inpmask;
6822 i6addr_t *src, *and;
6824 src = (i6addr_t *)&sin->sin6_addr;
6825 and = (i6addr_t *)&mask->sin6_addr;
6827 if (inpmask != NULL && atype != FRI_NETMASKED) {
6828 inpmask->i6[0] = 0xffffffff;
6829 inpmask->i6[1] = 0xffffffff;
6830 inpmask->i6[2] = 0xffffffff;
6831 inpmask->i6[3] = 0xffffffff;
6834 if (atype == FRI_NETWORK || atype == FRI_NETMASKED) {
6835 if (atype == FRI_NETMASKED) {
6836 if (inpmask == NULL)
6838 inpmask->i6[0] = and->i6[0];
6839 inpmask->i6[1] = and->i6[1];
6840 inpmask->i6[2] = and->i6[2];
6841 inpmask->i6[3] = and->i6[3];
6844 inp->i6[0] = src->i6[0] & and->i6[0];
6845 inp->i6[1] = src->i6[1] & and->i6[1];
6846 inp->i6[2] = src->i6[2] & and->i6[2];
6847 inp->i6[3] = src->i6[3] & and->i6[3];
6849 inp->i6[0] = src->i6[0];
6850 inp->i6[1] = src->i6[1];
6851 inp->i6[2] = src->i6[2];
6852 inp->i6[3] = src->i6[3];
6859 /* ------------------------------------------------------------------------ */
6860 /* Function: ipf_matchtag */
6861 /* Returns: 0 == mismatch, 1 == match. */
6862 /* Parameters: tag1(I) - pointer to first tag to compare */
6863 /* tag2(I) - pointer to second tag to compare */
6865 /* Returns true (non-zero) or false(0) if the two tag structures can be */
6866 /* considered to be a match or not match, respectively. The tag is 16 */
6867 /* bytes long (16 characters) but that is overlayed with 4 32bit ints so */
6868 /* compare the ints instead, for speed. tag1 is the master of the */
6869 /* comparison. This function should only be called with both tag1 and tag2 */
6870 /* as non-NULL pointers. */
6871 /* ------------------------------------------------------------------------ */
6873 ipf_matchtag(tag1, tag2)
6874 ipftag_t *tag1, *tag2;
6879 if ((tag1->ipt_num[0] == 0) && (tag2->ipt_num[0] == 0))
6882 if ((tag1->ipt_num[0] == tag2->ipt_num[0]) &&
6883 (tag1->ipt_num[1] == tag2->ipt_num[1]) &&
6884 (tag1->ipt_num[2] == tag2->ipt_num[2]) &&
6885 (tag1->ipt_num[3] == tag2->ipt_num[3]))
6891 /* ------------------------------------------------------------------------ */
6892 /* Function: ipf_coalesce */
6893 /* Returns: 1 == success, -1 == failure, 0 == no change */
6894 /* Parameters: fin(I) - pointer to packet information */
6896 /* Attempt to get all of the packet data into a single, contiguous buffer. */
6897 /* If this call returns a failure then the buffers have also been freed. */
6898 /* ------------------------------------------------------------------------ */
6904 if ((fin->fin_flx & FI_COALESCE) != 0)
6908 * If the mbuf pointers indicate that there is no mbuf to work with,
6909 * return but do not indicate success or failure.
6911 if (fin->fin_m == NULL || fin->fin_mp == NULL)
6914 #if defined(_KERNEL)
6915 if (ipf_pullup(fin->fin_m, fin, fin->fin_plen) == NULL) {
6916 ipf_main_softc_t *softc = fin->fin_main_soft;
6918 DT1(frb_coalesce, fr_info_t *, fin);
6919 LBUMP(ipf_stats[fin->fin_out].fr_badcoalesces);
6921 FREE_MB_T(*fin->fin_mp);
6923 fin->fin_reason = FRB_COALESCE;
6924 *fin->fin_mp = NULL;
6929 fin = fin; /* LINT */
6936 * The following table lists all of the tunable variables that can be
6937 * accessed via SIOCIPFGET/SIOCIPFSET/SIOCIPFGETNEXt. The format of each row
6938 * in the table below is as follows:
6940 * pointer to value, name of value, minimum, maximum, size of the value's
6941 * container, value attribute flags
6943 * For convienience, IPFT_RDONLY means the value is read-only, IPFT_WRDISABLED
6944 * means the value can only be written to when IPFilter is loaded but disabled.
6945 * The obvious implication is if neither of these are set then the value can be
6946 * changed at any time without harm.
6950 /* ------------------------------------------------------------------------ */
6951 /* Function: ipf_tune_findbycookie */
6952 /* Returns: NULL = search failed, else pointer to tune struct */
6953 /* Parameters: cookie(I) - cookie value to search for amongst tuneables */
6954 /* next(O) - pointer to place to store the cookie for the */
6955 /* "next" tuneable, if it is desired. */
6957 /* This function is used to walk through all of the existing tunables with */
6958 /* successive calls. It searches the known tunables for the one which has */
6959 /* a matching value for "cookie" - ie its address. When returning a match, */
6960 /* the next one to be found may be returned inside next. */
6961 /* ------------------------------------------------------------------------ */
6962 static ipftuneable_t *
6963 ipf_tune_findbycookie(ptop, cookie, next)
6964 ipftuneable_t **ptop;
6965 void *cookie, **next;
6967 ipftuneable_t *ta, **tap;
6969 for (ta = *ptop; ta->ipft_name != NULL; ta++)
6973 * If the next entry in the array has a name
6974 * present, then return a pointer to it for
6975 * where to go next, else return a pointer to
6976 * the dynaminc list as a key to search there
6977 * next. This facilitates a weak linking of
6978 * the two "lists" together.
6980 if ((ta + 1)->ipft_name != NULL)
6988 for (tap = ptop; (ta = *tap) != NULL; tap = &ta->ipft_next)
6989 if (tap == cookie) {
6991 *next = &ta->ipft_next;
7001 /* ------------------------------------------------------------------------ */
7002 /* Function: ipf_tune_findbyname */
7003 /* Returns: NULL = search failed, else pointer to tune struct */
7004 /* Parameters: name(I) - name of the tuneable entry to find. */
7006 /* Search the static array of tuneables and the list of dynamic tuneables */
7007 /* for an entry with a matching name. If we can find one, return a pointer */
7008 /* to the matching structure. */
7009 /* ------------------------------------------------------------------------ */
7010 static ipftuneable_t *
7011 ipf_tune_findbyname(top, name)
7017 for (ta = top; ta != NULL; ta = ta->ipft_next)
7018 if (!strcmp(ta->ipft_name, name)) {
7026 /* ------------------------------------------------------------------------ */
7027 /* Function: ipf_tune_add_array */
7028 /* Returns: int - 0 == success, else failure */
7029 /* Parameters: newtune - pointer to new tune array to add to tuneables */
7031 /* Appends tune structures from the array passed in (newtune) to the end of */
7032 /* the current list of "dynamic" tuneable parameters. */
7033 /* If any entry to be added is already present (by name) then the operation */
7034 /* is aborted - entries that have been added are removed before returning. */
7035 /* An entry with no name (NULL) is used as the indication that the end of */
7036 /* the array has been reached. */
7037 /* ------------------------------------------------------------------------ */
7039 ipf_tune_add_array(softc, newtune)
7040 ipf_main_softc_t *softc;
7041 ipftuneable_t *newtune;
7043 ipftuneable_t *nt, *dt;
7046 for (nt = newtune; nt->ipft_name != NULL; nt++) {
7047 error = ipf_tune_add(softc, nt);
7049 for (dt = newtune; dt != nt; dt++) {
7050 (void) ipf_tune_del(softc, dt);
7059 /* ------------------------------------------------------------------------ */
7060 /* Function: ipf_tune_array_link */
7061 /* Returns: 0 == success, -1 == failure */
7062 /* Parameters: softc(I) - soft context pointerto work with */
7063 /* array(I) - pointer to an array of tuneables */
7065 /* Given an array of tunables (array), append them to the current list of */
7066 /* tuneables for this context (softc->ipf_tuners.) To properly prepare the */
7067 /* the array for being appended to the list, initialise all of the next */
7068 /* pointers so we don't need to walk parts of it with ++ and others with */
7069 /* next. The array is expected to have an entry with a NULL name as the */
7070 /* terminator. Trying to add an array with no non-NULL names will return as */
7072 /* ------------------------------------------------------------------------ */
7074 ipf_tune_array_link(softc, array)
7075 ipf_main_softc_t *softc;
7076 ipftuneable_t *array;
7078 ipftuneable_t *t, **p;
7081 if (t->ipft_name == NULL)
7084 for (; t[1].ipft_name != NULL; t++)
7085 t[0].ipft_next = &t[1];
7086 t->ipft_next = NULL;
7089 * Since a pointer to the last entry isn't kept, we need to find it
7090 * each time we want to add new variables to the list.
7092 for (p = &softc->ipf_tuners; (t = *p) != NULL; p = &t->ipft_next)
7093 if (t->ipft_name == NULL)
7101 /* ------------------------------------------------------------------------ */
7102 /* Function: ipf_tune_array_unlink */
7103 /* Returns: 0 == success, -1 == failure */
7104 /* Parameters: softc(I) - soft context pointerto work with */
7105 /* array(I) - pointer to an array of tuneables */
7107 /* ------------------------------------------------------------------------ */
7109 ipf_tune_array_unlink(softc, array)
7110 ipf_main_softc_t *softc;
7111 ipftuneable_t *array;
7113 ipftuneable_t *t, **p;
7115 for (p = &softc->ipf_tuners; (t = *p) != NULL; p = &t->ipft_next)
7121 for (; t[1].ipft_name != NULL; t++)
7130 /* ------------------------------------------------------------------------ */
7131 /* Function: ipf_tune_array_copy */
7132 /* Returns: NULL = failure, else pointer to new array */
7133 /* Parameters: base(I) - pointer to structure base */
7134 /* size(I) - size of the array at template */
7135 /* template(I) - original array to copy */
7137 /* Allocate memory for a new set of tuneable values and copy everything */
7138 /* from template into the new region of memory. The new region is full of */
7139 /* uninitialised pointers (ipft_next) so set them up. Now, ipftp_offset... */
7141 /* NOTE: the following assumes that sizeof(long) == sizeof(void *) */
7142 /* In the array template, ipftp_offset is the offset (in bytes) of the */
7143 /* location of the tuneable value inside the structure pointed to by base. */
7144 /* As ipftp_offset is a union over the pointers to the tuneable values, if */
7145 /* we add base to the copy's ipftp_offset, copy ends up with a pointer in */
7146 /* ipftp_void that points to the stored value. */
7147 /* ------------------------------------------------------------------------ */
7149 ipf_tune_array_copy(base, size, template)
7152 ipftuneable_t *template;
7154 ipftuneable_t *copy;
7158 KMALLOCS(copy, ipftuneable_t *, size);
7162 bcopy(template, copy, size);
7164 for (i = 0; copy[i].ipft_name; i++) {
7165 copy[i].ipft_una.ipftp_offset += (u_long)base;
7166 copy[i].ipft_next = copy + i + 1;
7173 /* ------------------------------------------------------------------------ */
7174 /* Function: ipf_tune_add */
7175 /* Returns: int - 0 == success, else failure */
7176 /* Parameters: newtune - pointer to new tune entry to add to tuneables */
7178 /* Appends tune structures from the array passed in (newtune) to the end of */
7179 /* the current list of "dynamic" tuneable parameters. Once added, the */
7180 /* owner of the object is not expected to ever change "ipft_next". */
7181 /* ------------------------------------------------------------------------ */
7183 ipf_tune_add(softc, newtune)
7184 ipf_main_softc_t *softc;
7185 ipftuneable_t *newtune;
7187 ipftuneable_t *ta, **tap;
7189 ta = ipf_tune_findbyname(softc->ipf_tuners, newtune->ipft_name);
7195 for (tap = &softc->ipf_tuners; *tap != NULL; tap = &(*tap)->ipft_next)
7198 newtune->ipft_next = NULL;
7204 /* ------------------------------------------------------------------------ */
7205 /* Function: ipf_tune_del */
7206 /* Returns: int - 0 == success, else failure */
7207 /* Parameters: oldtune - pointer to tune entry to remove from the list of */
7208 /* current dynamic tuneables */
7210 /* Search for the tune structure, by pointer, in the list of those that are */
7211 /* dynamically added at run time. If found, adjust the list so that this */
7212 /* structure is no longer part of it. */
7213 /* ------------------------------------------------------------------------ */
7215 ipf_tune_del(softc, oldtune)
7216 ipf_main_softc_t *softc;
7217 ipftuneable_t *oldtune;
7219 ipftuneable_t *ta, **tap;
7222 for (tap = &softc->ipf_tuners; (ta = *tap) != NULL;
7223 tap = &ta->ipft_next) {
7224 if (ta == oldtune) {
7225 *tap = oldtune->ipft_next;
7226 oldtune->ipft_next = NULL;
7239 /* ------------------------------------------------------------------------ */
7240 /* Function: ipf_tune_del_array */
7241 /* Returns: int - 0 == success, else failure */
7242 /* Parameters: oldtune - pointer to tuneables array */
7244 /* Remove each tuneable entry in the array from the list of "dynamic" */
7245 /* tunables. If one entry should fail to be found, an error will be */
7246 /* returned and no further ones removed. */
7247 /* An entry with a NULL name is used as the indicator of the last entry in */
7249 /* ------------------------------------------------------------------------ */
7251 ipf_tune_del_array(softc, oldtune)
7252 ipf_main_softc_t *softc;
7253 ipftuneable_t *oldtune;
7258 for (ot = oldtune; ot->ipft_name != NULL; ot++) {
7259 error = ipf_tune_del(softc, ot);
7269 /* ------------------------------------------------------------------------ */
7270 /* Function: ipf_tune */
7271 /* Returns: int - 0 == success, else failure */
7272 /* Parameters: cmd(I) - ioctl command number */
7273 /* data(I) - pointer to ioctl data structure */
7275 /* Implement handling of SIOCIPFGETNEXT, SIOCIPFGET and SIOCIPFSET. These */
7276 /* three ioctls provide the means to access and control global variables */
7277 /* within IPFilter, allowing (for example) timeouts and table sizes to be */
7278 /* changed without rebooting, reloading or recompiling. The initialisation */
7279 /* and 'destruction' routines of the various components of ipfilter are all */
7280 /* each responsible for handling their own values being too big. */
7281 /* ------------------------------------------------------------------------ */
7283 ipf_ipftune(softc, cmd, data)
7284 ipf_main_softc_t *softc;
7293 error = ipf_inobj(softc, data, NULL, &tu, IPFOBJ_TUNEABLE);
7297 tu.ipft_name[sizeof(tu.ipft_name) - 1] = '\0';
7298 cookie = tu.ipft_cookie;
7303 case SIOCIPFGETNEXT :
7305 * If cookie is non-NULL, assume it to be a pointer to the last
7306 * entry we looked at, so find it (if possible) and return a
7307 * pointer to the next one after it. The last entry in the
7308 * the table is a NULL entry, so when we get to it, set cookie
7309 * to NULL and return that, indicating end of list, erstwhile
7310 * if we come in with cookie set to NULL, we are starting anew
7311 * at the front of the list.
7313 if (cookie != NULL) {
7314 ta = ipf_tune_findbycookie(&softc->ipf_tuners,
7315 cookie, &tu.ipft_cookie);
7317 ta = softc->ipf_tuners;
7318 tu.ipft_cookie = ta + 1;
7322 * Entry found, but does the data pointed to by that
7323 * row fit in what we can return?
7325 if (ta->ipft_sz > sizeof(tu.ipft_un)) {
7331 if (ta->ipft_sz == sizeof(u_long))
7332 tu.ipft_vlong = *ta->ipft_plong;
7333 else if (ta->ipft_sz == sizeof(u_int))
7334 tu.ipft_vint = *ta->ipft_pint;
7335 else if (ta->ipft_sz == sizeof(u_short))
7336 tu.ipft_vshort = *ta->ipft_pshort;
7337 else if (ta->ipft_sz == sizeof(u_char))
7338 tu.ipft_vchar = *ta->ipft_pchar;
7340 tu.ipft_sz = ta->ipft_sz;
7341 tu.ipft_min = ta->ipft_min;
7342 tu.ipft_max = ta->ipft_max;
7343 tu.ipft_flags = ta->ipft_flags;
7344 bcopy(ta->ipft_name, tu.ipft_name,
7345 MIN(sizeof(tu.ipft_name),
7346 strlen(ta->ipft_name) + 1));
7348 error = ipf_outobj(softc, data, &tu, IPFOBJ_TUNEABLE);
7354 * Search by name or by cookie value for a particular entry
7355 * in the tuning paramter table.
7359 if (cookie != NULL) {
7360 ta = ipf_tune_findbycookie(&softc->ipf_tuners,
7364 } else if (tu.ipft_name[0] != '\0') {
7365 ta = ipf_tune_findbyname(softc->ipf_tuners,
7373 if (cmd == (ioctlcmd_t)SIOCIPFGET) {
7375 * Fetch the tuning parameters for a particular value
7378 if (ta->ipft_sz == sizeof(u_long))
7379 tu.ipft_vlong = *ta->ipft_plong;
7380 else if (ta->ipft_sz == sizeof(u_int))
7381 tu.ipft_vint = *ta->ipft_pint;
7382 else if (ta->ipft_sz == sizeof(u_short))
7383 tu.ipft_vshort = *ta->ipft_pshort;
7384 else if (ta->ipft_sz == sizeof(u_char))
7385 tu.ipft_vchar = *ta->ipft_pchar;
7386 tu.ipft_cookie = ta;
7387 tu.ipft_sz = ta->ipft_sz;
7388 tu.ipft_min = ta->ipft_min;
7389 tu.ipft_max = ta->ipft_max;
7390 tu.ipft_flags = ta->ipft_flags;
7391 error = ipf_outobj(softc, data, &tu, IPFOBJ_TUNEABLE);
7393 } else if (cmd == (ioctlcmd_t)SIOCIPFSET) {
7395 * Set an internal parameter. The hard part here is
7396 * getting the new value safely and correctly out of
7397 * the kernel (given we only know its size, not type.)
7401 if (((ta->ipft_flags & IPFT_WRDISABLED) != 0) &&
7402 (softc->ipf_running > 0)) {
7409 if (in < ta->ipft_min || in > ta->ipft_max) {
7415 if (ta->ipft_func != NULL) {
7419 error = (*ta->ipft_func)(softc, ta,
7423 } else if (ta->ipft_sz == sizeof(u_long)) {
7424 tu.ipft_vlong = *ta->ipft_plong;
7425 *ta->ipft_plong = in;
7427 } else if (ta->ipft_sz == sizeof(u_int)) {
7428 tu.ipft_vint = *ta->ipft_pint;
7429 *ta->ipft_pint = (u_int)(in & 0xffffffff);
7431 } else if (ta->ipft_sz == sizeof(u_short)) {
7432 tu.ipft_vshort = *ta->ipft_pshort;
7433 *ta->ipft_pshort = (u_short)(in & 0xffff);
7435 } else if (ta->ipft_sz == sizeof(u_char)) {
7436 tu.ipft_vchar = *ta->ipft_pchar;
7437 *ta->ipft_pchar = (u_char)(in & 0xff);
7439 error = ipf_outobj(softc, data, &tu, IPFOBJ_TUNEABLE);
7453 /* ------------------------------------------------------------------------ */
7454 /* Function: ipf_zerostats */
7455 /* Returns: int - 0 = success, else failure */
7456 /* Parameters: data(O) - pointer to pointer for copying data back to */
7458 /* Copies the current statistics out to userspace and then zero's the */
7459 /* current ones in the kernel. The lock is only held across the bzero() as */
7460 /* the copyout may result in paging (ie network activity.) */
7461 /* ------------------------------------------------------------------------ */
7463 ipf_zerostats(softc, data)
7464 ipf_main_softc_t *softc;
7471 error = ipf_inobj(softc, data, &obj, &fio, IPFOBJ_IPFSTAT);
7474 ipf_getstat(softc, &fio, obj.ipfo_rev);
7475 error = ipf_outobj(softc, data, &fio, IPFOBJ_IPFSTAT);
7479 WRITE_ENTER(&softc->ipf_mutex);
7480 bzero(&softc->ipf_stats, sizeof(softc->ipf_stats));
7481 RWLOCK_EXIT(&softc->ipf_mutex);
7487 /* ------------------------------------------------------------------------ */
7488 /* Function: ipf_resolvedest */
7490 /* Parameters: softc(I) - pointer to soft context main structure */
7491 /* base(I) - where strings are stored */
7492 /* fdp(IO) - pointer to destination information to resolve */
7493 /* v(I) - IP protocol version to match */
7495 /* Looks up an interface name in the frdest structure pointed to by fdp and */
7496 /* if a matching name can be found for the particular IP protocol version */
7497 /* then store the interface pointer in the frdest struct. If no match is */
7498 /* found, then set the interface pointer to be -1 as NULL is considered to */
7499 /* indicate there is no information at all in the structure. */
7500 /* ------------------------------------------------------------------------ */
7502 ipf_resolvedest(softc, base, fdp, v)
7503 ipf_main_softc_t *softc;
7513 if (fdp->fd_name != -1) {
7514 if (fdp->fd_type == FRD_DSTLIST) {
7515 ifp = ipf_lookup_res_name(softc, IPL_LOGIPF,
7517 base + fdp->fd_name,
7524 ifp = GETIFP(base + fdp->fd_name, v);
7531 if ((ifp != NULL) && (ifp != (void *)-1)) {
7532 fdp->fd_local = ipf_deliverlocal(softc, v, ifp, &fdp->fd_ip6);
7539 /* ------------------------------------------------------------------------ */
7540 /* Function: ipf_resolvenic */
7541 /* Returns: void* - NULL = wildcard name, -1 = failed to find NIC, else */
7542 /* pointer to interface structure for NIC */
7543 /* Parameters: softc(I)- pointer to soft context main structure */
7544 /* name(I) - complete interface name */
7545 /* v(I) - IP protocol version */
7547 /* Look for a network interface structure that firstly has a matching name */
7548 /* to that passed in and that is also being used for that IP protocol */
7549 /* version (necessary on some platforms where there are separate listings */
7550 /* for both IPv4 and IPv6 on the same physical NIC. */
7551 /* ------------------------------------------------------------------------ */
7553 ipf_resolvenic(softc, name, v)
7554 ipf_main_softc_t *softc;
7560 softc = softc; /* gcc -Wextra */
7561 if (name[0] == '\0')
7564 if ((name[1] == '\0') && ((name[0] == '-') || (name[0] == '*'))) {
7568 nic = GETIFP(name, v);
7575 /* ------------------------------------------------------------------------ */
7576 /* Function: ipf_token_expire */
7577 /* Returns: None. */
7578 /* Parameters: softc(I) - pointer to soft context main structure */
7580 /* This function is run every ipf tick to see if there are any tokens that */
7581 /* have been held for too long and need to be freed up. */
7582 /* ------------------------------------------------------------------------ */
7584 ipf_token_expire(softc)
7585 ipf_main_softc_t *softc;
7589 WRITE_ENTER(&softc->ipf_tokens);
7590 while ((it = softc->ipf_token_head) != NULL) {
7591 if (it->ipt_die > softc->ipf_ticks)
7594 ipf_token_deref(softc, it);
7596 RWLOCK_EXIT(&softc->ipf_tokens);
7600 /* ------------------------------------------------------------------------ */
7601 /* Function: ipf_token_flush */
7602 /* Returns: None. */
7603 /* Parameters: softc(I) - pointer to soft context main structure */
7605 /* Loop through all of the existing tokens and call deref to see if they */
7606 /* can be freed. Normally a function like this might just loop on */
7607 /* ipf_token_head but there is a chance that a token might have a ref count */
7608 /* of greater than one and in that case the the reference would drop twice */
7609 /* by code that is only entitled to drop it once. */
7610 /* ------------------------------------------------------------------------ */
7612 ipf_token_flush(softc)
7613 ipf_main_softc_t *softc;
7615 ipftoken_t *it, *next;
7617 WRITE_ENTER(&softc->ipf_tokens);
7618 for (it = softc->ipf_token_head; it != NULL; it = next) {
7619 next = it->ipt_next;
7620 (void) ipf_token_deref(softc, it);
7622 RWLOCK_EXIT(&softc->ipf_tokens);
7626 /* ------------------------------------------------------------------------ */
7627 /* Function: ipf_token_del */
7628 /* Returns: int - 0 = success, else error */
7629 /* Parameters: softc(I)- pointer to soft context main structure */
7630 /* type(I) - the token type to match */
7631 /* uid(I) - uid owning the token */
7632 /* ptr(I) - context pointer for the token */
7634 /* This function looks for a a token in the current list that matches up */
7635 /* the fields (type, uid, ptr). If none is found, ESRCH is returned, else */
7636 /* call ipf_token_dewref() to remove it from the list. In the event that */
7637 /* the token has a reference held elsewhere, setting ipt_complete to 2 */
7638 /* enables debugging to distinguish between the two paths that ultimately */
7639 /* lead to a token to be deleted. */
7640 /* ------------------------------------------------------------------------ */
7642 ipf_token_del(softc, type, uid, ptr)
7643 ipf_main_softc_t *softc;
7653 WRITE_ENTER(&softc->ipf_tokens);
7654 for (it = softc->ipf_token_head; it != NULL; it = it->ipt_next) {
7655 if (ptr == it->ipt_ctx && type == it->ipt_type &&
7656 uid == it->ipt_uid) {
7657 it->ipt_complete = 2;
7658 ipf_token_deref(softc, it);
7663 RWLOCK_EXIT(&softc->ipf_tokens);
7669 /* ------------------------------------------------------------------------ */
7670 /* Function: ipf_token_mark_complete */
7671 /* Returns: None. */
7672 /* Parameters: token(I) - pointer to token structure */
7674 /* Mark a token as being ineligable for being found with ipf_token_find. */
7675 /* ------------------------------------------------------------------------ */
7677 ipf_token_mark_complete(token)
7680 if (token->ipt_complete == 0)
7681 token->ipt_complete = 1;
7685 /* ------------------------------------------------------------------------ */
7686 /* Function: ipf_token_find */
7687 /* Returns: ipftoken_t * - NULL if no memory, else pointer to token */
7688 /* Parameters: softc(I)- pointer to soft context main structure */
7689 /* type(I) - the token type to match */
7690 /* uid(I) - uid owning the token */
7691 /* ptr(I) - context pointer for the token */
7693 /* This function looks for a live token in the list of current tokens that */
7694 /* matches the tuple (type, uid, ptr). If one cannot be found then one is */
7695 /* allocated. If one is found then it is moved to the top of the list of */
7696 /* currently active tokens. */
7697 /* ------------------------------------------------------------------------ */
7699 ipf_token_find(softc, type, uid, ptr)
7700 ipf_main_softc_t *softc;
7704 ipftoken_t *it, *new;
7706 KMALLOC(new, ipftoken_t *);
7708 bzero((char *)new, sizeof(*new));
7710 WRITE_ENTER(&softc->ipf_tokens);
7711 for (it = softc->ipf_token_head; it != NULL; it = it->ipt_next) {
7712 if ((ptr == it->ipt_ctx) && (type == it->ipt_type) &&
7713 (uid == it->ipt_uid) && (it->ipt_complete < 2))
7721 RWLOCK_EXIT(&softc->ipf_tokens);
7726 it->ipt_type = type;
7734 if (it->ipt_complete > 0)
7737 ipf_token_unlink(softc, it);
7741 it->ipt_pnext = softc->ipf_token_tail;
7742 *softc->ipf_token_tail = it;
7743 softc->ipf_token_tail = &it->ipt_next;
7744 it->ipt_next = NULL;
7747 it->ipt_die = softc->ipf_ticks + 20;
7750 RWLOCK_EXIT(&softc->ipf_tokens);
7756 /* ------------------------------------------------------------------------ */
7757 /* Function: ipf_token_unlink */
7758 /* Returns: None. */
7759 /* Parameters: softc(I) - pointer to soft context main structure */
7760 /* token(I) - pointer to token structure */
7761 /* Write Locks: ipf_tokens */
7763 /* This function unlinks a token structure from the linked list of tokens */
7764 /* that "own" it. The head pointer never needs to be explicitly adjusted */
7765 /* but the tail does due to the linked list implementation. */
7766 /* ------------------------------------------------------------------------ */
7768 ipf_token_unlink(softc, token)
7769 ipf_main_softc_t *softc;
7773 if (softc->ipf_token_tail == &token->ipt_next)
7774 softc->ipf_token_tail = token->ipt_pnext;
7776 *token->ipt_pnext = token->ipt_next;
7777 if (token->ipt_next != NULL)
7778 token->ipt_next->ipt_pnext = token->ipt_pnext;
7779 token->ipt_next = NULL;
7780 token->ipt_pnext = NULL;
7784 /* ------------------------------------------------------------------------ */
7785 /* Function: ipf_token_deref */
7786 /* Returns: int - 0 == token freed, else reference count */
7787 /* Parameters: softc(I) - pointer to soft context main structure */
7788 /* token(I) - pointer to token structure */
7789 /* Write Locks: ipf_tokens */
7791 /* Drop the reference count on the token structure and if it drops to zero, */
7792 /* call the dereference function for the token type because it is then */
7793 /* possible to free the token data structure. */
7794 /* ------------------------------------------------------------------------ */
7796 ipf_token_deref(softc, token)
7797 ipf_main_softc_t *softc;
7800 void *data, **datap;
7802 ASSERT(token->ipt_ref > 0);
7804 if (token->ipt_ref > 0)
7805 return token->ipt_ref;
7807 data = token->ipt_data;
7810 if ((data != NULL) && (data != (void *)-1)) {
7811 switch (token->ipt_type)
7813 case IPFGENITER_IPF :
7814 (void) ipf_derefrule(softc, (frentry_t **)datap);
7816 case IPFGENITER_IPNAT :
7817 WRITE_ENTER(&softc->ipf_nat);
7818 ipf_nat_rule_deref(softc, (ipnat_t **)datap);
7819 RWLOCK_EXIT(&softc->ipf_nat);
7821 case IPFGENITER_NAT :
7822 ipf_nat_deref(softc, (nat_t **)datap);
7824 case IPFGENITER_STATE :
7825 ipf_state_deref(softc, (ipstate_t **)datap);
7827 case IPFGENITER_FRAG :
7828 ipf_frag_pkt_deref(softc, (ipfr_t **)datap);
7830 case IPFGENITER_NATFRAG :
7831 ipf_frag_nat_deref(softc, (ipfr_t **)datap);
7833 case IPFGENITER_HOSTMAP :
7834 WRITE_ENTER(&softc->ipf_nat);
7835 ipf_nat_hostmapdel(softc, (hostmap_t **)datap);
7836 RWLOCK_EXIT(&softc->ipf_nat);
7839 ipf_lookup_iterderef(softc, token->ipt_type, data);
7844 ipf_token_unlink(softc, token);
7850 /* ------------------------------------------------------------------------ */
7851 /* Function: ipf_nextrule */
7852 /* Returns: frentry_t * - NULL == no more rules, else pointer to next */
7853 /* Parameters: softc(I) - pointer to soft context main structure */
7854 /* fr(I) - pointer to filter rule */
7855 /* out(I) - 1 == out rules, 0 == input rules */
7857 /* Starting with "fr", find the next rule to visit. This includes visiting */
7858 /* the list of rule groups if either fr is NULL (empty list) or it is the */
7859 /* last rule in the list. When walking rule lists, it is either input or */
7860 /* output rules that are returned, never both. */
7861 /* ------------------------------------------------------------------------ */
7863 ipf_nextrule(softc, active, unit, fr, out)
7864 ipf_main_softc_t *softc;
7872 if (fr != NULL && fr->fr_group != -1) {
7873 fg = ipf_findgroup(softc, fr->fr_names + fr->fr_group,
7874 unit, active, NULL);
7878 fg = softc->ipf_groups[unit][active];
7881 while (fg != NULL) {
7882 next = fg->fg_start;
7883 while (next != NULL) {
7885 if (next->fr_flags & FR_OUTQUE)
7887 } else if (next->fr_flags & FR_INQUE) {
7890 next = next->fr_next;
7899 /* ------------------------------------------------------------------------ */
7900 /* Function: ipf_getnextrule */
7901 /* Returns: int - 0 = success, else error */
7902 /* Parameters: softc(I)- pointer to soft context main structure */
7903 /* t(I) - pointer to destination information to resolve */
7904 /* ptr(I) - pointer to ipfobj_t to copyin from user space */
7906 /* This function's first job is to bring in the ipfruleiter_t structure via */
7907 /* the ipfobj_t structure to determine what should be the next rule to */
7908 /* return. Once the ipfruleiter_t has been brought in, it then tries to */
7909 /* find the 'next rule'. This may include searching rule group lists or */
7910 /* just be as simple as looking at the 'next' field in the rule structure. */
7911 /* When we have found the rule to return, increase its reference count and */
7912 /* if we used an existing rule to get here, decrease its reference count. */
7913 /* ------------------------------------------------------------------------ */
7915 ipf_getnextrule(softc, t, ptr)
7916 ipf_main_softc_t *softc;
7920 frentry_t *fr, *next, zero;
7929 if (t == NULL || ptr == NULL) {
7934 error = ipf_inobj(softc, ptr, &obj, &it, IPFOBJ_IPFITER);
7938 if ((it.iri_inout < 0) || (it.iri_inout > 3)) {
7942 if ((it.iri_active != 0) && (it.iri_active != 1)) {
7946 if (it.iri_nrules == 0) {
7950 if (it.iri_rule == NULL) {
7957 if ((it.iri_inout & F_OUT) != 0)
7961 if ((it.iri_inout & F_ACIN) != 0)
7962 unit = IPL_LOGCOUNT;
7966 READ_ENTER(&softc->ipf_mutex);
7968 if (*it.iri_group == '\0') {
7969 if (unit == IPL_LOGCOUNT) {
7970 next = softc->ipf_acct[out][it.iri_active];
7972 next = softc->ipf_rules[out][it.iri_active];
7975 next = ipf_nextrule(softc, it.iri_active,
7978 fg = ipf_findgroup(softc, it.iri_group, unit,
7979 it.iri_active, NULL);
7981 next = fg->fg_start;
7988 next = ipf_nextrule(softc, it.iri_active, unit,
7992 if (next != NULL && next->fr_next != NULL)
7994 else if (ipf_nextrule(softc, it.iri_active, unit, next, out) != NULL)
8000 (void) ipf_derefrule(softc, &fr);
8002 obj.ipfo_type = IPFOBJ_FRENTRY;
8003 dst = (char *)it.iri_rule;
8006 obj.ipfo_size = next->fr_size;
8007 MUTEX_ENTER(&next->fr_lock);
8009 MUTEX_EXIT(&next->fr_lock);
8012 obj.ipfo_size = sizeof(frentry_t);
8013 bzero(&zero, sizeof(zero));
8017 it.iri_rule = predict ? next : NULL;
8019 ipf_token_mark_complete(t);
8021 RWLOCK_EXIT(&softc->ipf_mutex);
8024 error = ipf_outobjk(softc, &obj, next);
8025 if (error == 0 && t->ipt_data != NULL) {
8026 dst += obj.ipfo_size;
8027 if (next->fr_data != NULL) {
8030 if (next->fr_type == FR_T_IPFEXPR)
8031 dobj.ipfo_type = IPFOBJ_IPFEXPR;
8033 dobj.ipfo_type = IPFOBJ_FRIPF;
8034 dobj.ipfo_size = next->fr_dsize;
8035 dobj.ipfo_rev = obj.ipfo_rev;
8036 dobj.ipfo_ptr = dst;
8037 error = ipf_outobjk(softc, &dobj, next->fr_data);
8041 if ((fr != NULL) && (next == &zero))
8042 (void) ipf_derefrule(softc, &fr);
8048 /* ------------------------------------------------------------------------ */
8049 /* Function: ipf_frruleiter */
8050 /* Returns: int - 0 = success, else error */
8051 /* Parameters: softc(I)- pointer to soft context main structure */
8052 /* data(I) - the token type to match */
8053 /* uid(I) - uid owning the token */
8054 /* ptr(I) - context pointer for the token */
8056 /* This function serves as a stepping stone between ipf_ipf_ioctl and */
8057 /* ipf_getnextrule. It's role is to find the right token in the kernel for */
8058 /* the process doing the ioctl and use that to ask for the next rule. */
8059 /* ------------------------------------------------------------------------ */
8061 ipf_frruleiter(softc, data, uid, ctx)
8062 ipf_main_softc_t *softc;
8071 token = ipf_token_find(softc, IPFGENITER_IPF, uid, ctx);
8072 if (token != NULL) {
8073 error = ipf_getnextrule(softc, token, data);
8074 WRITE_ENTER(&softc->ipf_tokens);
8075 ipf_token_deref(softc, token);
8076 RWLOCK_EXIT(&softc->ipf_tokens);
8078 error = ipf_inobj(softc, data, &obj, &it, IPFOBJ_IPFITER);
8082 error = ipf_outobj(softc, data, &it, IPFOBJ_IPFITER);
8089 /* ------------------------------------------------------------------------ */
8090 /* Function: ipf_geniter */
8091 /* Returns: int - 0 = success, else error */
8092 /* Parameters: softc(I) - pointer to soft context main structure */
8093 /* token(I) - pointer to ipftoken_t structure */
8094 /* itp(I) - pointer to iterator data */
8096 /* Decide which iterator function to call using information passed through */
8097 /* the ipfgeniter_t structure at itp. */
8098 /* ------------------------------------------------------------------------ */
8100 ipf_geniter(softc, token, itp)
8101 ipf_main_softc_t *softc;
8107 switch (itp->igi_type)
8109 case IPFGENITER_FRAG :
8110 error = ipf_frag_pkt_next(softc, token, itp);
8122 /* ------------------------------------------------------------------------ */
8123 /* Function: ipf_genericiter */
8124 /* Returns: int - 0 = success, else error */
8125 /* Parameters: softc(I)- pointer to soft context main structure */
8126 /* data(I) - the token type to match */
8127 /* uid(I) - uid owning the token */
8128 /* ptr(I) - context pointer for the token */
8130 /* Handle the SIOCGENITER ioctl for the ipfilter device. The primary role */
8131 /* ------------------------------------------------------------------------ */
8133 ipf_genericiter(softc, data, uid, ctx)
8134 ipf_main_softc_t *softc;
8142 error = ipf_inobj(softc, data, NULL, &iter, IPFOBJ_GENITER);
8146 token = ipf_token_find(softc, iter.igi_type, uid, ctx);
8147 if (token != NULL) {
8148 token->ipt_subtype = iter.igi_type;
8149 error = ipf_geniter(softc, token, &iter);
8150 WRITE_ENTER(&softc->ipf_tokens);
8151 ipf_token_deref(softc, token);
8152 RWLOCK_EXIT(&softc->ipf_tokens);
8162 /* ------------------------------------------------------------------------ */
8163 /* Function: ipf_ipf_ioctl */
8164 /* Returns: int - 0 = success, else error */
8165 /* Parameters: softc(I)- pointer to soft context main structure */
8166 /* data(I) - the token type to match */
8167 /* cmd(I) - the ioctl command number */
8168 /* mode(I) - mode flags for the ioctl */
8169 /* uid(I) - uid owning the token */
8170 /* ptr(I) - context pointer for the token */
8172 /* This function handles all of the ioctl command that are actually isssued */
8173 /* to the /dev/ipl device. */
8174 /* ------------------------------------------------------------------------ */
8176 ipf_ipf_ioctl(softc, data, cmd, mode, uid, ctx)
8177 ipf_main_softc_t *softc;
8191 if (!(mode & FWRITE)) {
8195 error = BCOPYIN(data, &tmp, sizeof(tmp));
8202 WRITE_ENTER(&softc->ipf_global);
8204 if (softc->ipf_running > 0)
8207 error = ipfattach(softc);
8209 softc->ipf_running = 1;
8211 (void) ipfdetach(softc);
8213 if (softc->ipf_running == 1)
8214 error = ipfdetach(softc);
8218 softc->ipf_running = -1;
8220 RWLOCK_EXIT(&softc->ipf_global);
8225 if (!(mode & FWRITE)) {
8231 case SIOCIPFGETNEXT :
8233 error = ipf_ipftune(softc, cmd, (void *)data);
8237 if (!(mode & FWRITE)) {
8241 error = BCOPYIN(data, &softc->ipf_flags,
8242 sizeof(softc->ipf_flags));
8251 error = BCOPYOUT(&softc->ipf_flags, data,
8252 sizeof(softc->ipf_flags));
8260 error = ipf_resolvefunc(softc, (void *)data);
8267 if (!(mode & FWRITE)) {
8271 error = frrequest(softc, IPL_LOGIPF, cmd, (caddr_t)data,
8272 softc->ipf_active, 1);
8279 if (!(mode & FWRITE)) {
8283 error = frrequest(softc, IPL_LOGIPF, cmd, (caddr_t)data,
8284 1 - softc->ipf_active, 1);
8289 if (!(mode & FWRITE)) {
8293 WRITE_ENTER(&softc->ipf_mutex);
8294 error = BCOPYOUT(&softc->ipf_active, data,
8295 sizeof(softc->ipf_active));
8300 softc->ipf_active = 1 - softc->ipf_active;
8302 RWLOCK_EXIT(&softc->ipf_mutex);
8307 error = ipf_inobj(softc, (void *)data, &obj, &fio,
8311 ipf_getstat(softc, &fio, obj.ipfo_rev);
8312 error = ipf_outobj(softc, (void *)data, &fio, IPFOBJ_IPFSTAT);
8316 if (!(mode & FWRITE)) {
8320 error = ipf_zerostats(softc, (caddr_t)data);
8324 if (!(mode & FWRITE)) {
8328 error = BCOPYIN(data, &tmp, sizeof(tmp));
8330 tmp = ipf_flush(softc, IPL_LOGIPF, tmp);
8331 error = BCOPYOUT(&tmp, data, sizeof(tmp));
8345 if (!(mode & FWRITE)) {
8349 error = BCOPYIN(data, &tmp, sizeof(tmp));
8351 tmp = ipf_flush(softc, IPL_LOGIPF, tmp);
8352 error = BCOPYOUT(&tmp, data, sizeof(tmp));
8366 if (!(mode & FWRITE)) {
8370 error = BCOPYIN(data, &tmp, sizeof(tmp));
8372 ipf_state_setlock(softc->ipf_state_soft, tmp);
8373 ipf_nat_setlock(softc->ipf_nat_soft, tmp);
8374 ipf_frag_setlock(softc->ipf_frag_soft, tmp);
8375 ipf_auth_setlock(softc->ipf_auth_soft, tmp);
8385 if (!(mode & FWRITE)) {
8389 tmp = ipf_log_clear(softc, IPL_LOGIPF);
8390 error = BCOPYOUT(&tmp, data, sizeof(tmp));
8397 #endif /* IPFILTER_LOG */
8400 if (!(mode & FWRITE)) {
8404 WRITE_ENTER(&softc->ipf_global);
8405 #if (defined(MENTAT) && defined(_KERNEL)) && !defined(INSTANCES)
8408 ipf_sync(softc, NULL);
8411 RWLOCK_EXIT(&softc->ipf_global);
8417 error = ipf_outobj(softc, (void *)data,
8418 ipf_frag_stats(softc->ipf_frag_soft),
8424 tmp = ipf_log_bytesused(softc, IPL_LOGIPF);
8425 error = BCOPYOUT(&tmp, data, sizeof(tmp));
8431 error = ipf_frruleiter(softc, data, uid, ctx);
8437 error = ipf_genericiter(softc, data, uid, ctx);
8441 case SIOCIPFDELTOK :
8442 error = BCOPYIN(data, &tmp, sizeof(tmp));
8445 error = ipf_token_del(softc, tmp, uid, ctx);
8460 /* ------------------------------------------------------------------------ */
8461 /* Function: ipf_decaps */
8462 /* Returns: int - -1 == decapsulation failed, else bit mask of */
8463 /* flags indicating packet filtering decision. */
8464 /* Parameters: fin(I) - pointer to packet information */
8465 /* pass(I) - IP protocol version to match */
8466 /* l5proto(I) - layer 5 protocol to decode UDP data as. */
8468 /* This function is called for packets that are wrapt up in other packets, */
8469 /* for example, an IP packet that is the entire data segment for another IP */
8470 /* packet. If the basic constraints for this are satisfied, change the */
8471 /* buffer to point to the start of the inner packet and start processing */
8472 /* rules belonging to the head group this rule specifies. */
8473 /* ------------------------------------------------------------------------ */
8475 ipf_decaps(fin, pass, l5proto)
8480 fr_info_t fin2, *fino = NULL;
8486 if ((fin->fin_flx & FI_COALESCE) == 0)
8487 if (ipf_coalesce(fin) == -1)
8491 hlen = fin->fin_hlen;
8497 * In this case, the specific protocol being decapsulated
8498 * inside UDP frames comes from the rule.
8500 nh = fin->fin_fr->fr_icode;
8503 case IPPROTO_GRE : /* 47 */
8504 bcopy(fin->fin_dp, (char *)&gre, sizeof(gre));
8505 hlen += sizeof(grehdr_t);
8506 if (gre.gr_R|gre.gr_s)
8518 * If the routing options flag is set, validate that it is
8519 * there and bounce over it.
8522 /* This is really heavy weight and lots of room for error, */
8523 /* so for now, put it off and get the simple stuff right. */
8525 u_char off, len, *s;
8532 aplen = fin->fin_plen - hlen;
8534 af = (s[0] << 8) | s[1];
8539 if (af == 0 && len == 0) {
8550 hlen = s - (u_char *)fin->fin_dp;
8556 case IPPROTO_IPIP : /* 4 */
8561 default : /* Includes ESP, AH is special for IPv4 */
8574 bcopy((char *)fin, (char *)&fin2, sizeof(fin2));
8578 #if defined(MENTAT) && defined(_KERNEL)
8584 fin->fin_plen -= elen;
8586 ip = (ip_t *)((char *)fin->fin_ip + elen);
8589 * Make sure we have at least enough data for the network layer
8593 hlen = IP_HL(ip) << 2;
8595 else if (IP_V(ip) == 6)
8596 hlen = sizeof(ip6_t);
8601 if (fin->fin_plen < hlen)
8604 fin->fin_dp = (char *)ip + hlen;
8606 if (IP_V(ip) == 4) {
8608 * Perform IPv4 header checksum validation.
8610 if (ipf_cksum((u_short *)ip, hlen))
8614 if (ipf_makefrip(hlen, ip, fin) == -1) {
8617 #if defined(MENTAT) && defined(_KERNEL)
8625 DT1(frb_decapfrip, fr_info_t *, fin);
8626 pass &= ~FR_CMDMASK;
8627 pass |= FR_BLOCK|FR_QUICK;
8628 fin->fin_reason = FRB_DECAPFRIP;
8632 pass = ipf_scanlist(fin, pass);
8635 * Copy the packet filter "result" fields out of the fr_info_t struct
8636 * that is local to the decapsulation processing and back into the
8637 * one we were called with.
8639 fino->fin_flx = fin->fin_flx;
8640 fino->fin_rev = fin->fin_rev;
8641 fino->fin_icode = fin->fin_icode;
8642 fino->fin_rule = fin->fin_rule;
8643 (void) strncpy(fino->fin_group, fin->fin_group, FR_GROUPLEN);
8644 fino->fin_fr = fin->fin_fr;
8645 fino->fin_error = fin->fin_error;
8646 fino->fin_mp = fin->fin_mp;
8647 fino->fin_m = fin->fin_m;
8650 #if defined(MENTAT) && defined(_KERNEL)
8661 /* ------------------------------------------------------------------------ */
8662 /* Function: ipf_matcharray_load */
8663 /* Returns: int - 0 = success, else error */
8664 /* Parameters: softc(I) - pointer to soft context main structure */
8665 /* data(I) - pointer to ioctl data */
8666 /* objp(I) - ipfobj_t structure to load data into */
8667 /* arrayptr(I) - pointer to location to store array pointer */
8669 /* This function loads in a mathing array through the ipfobj_t struct that */
8670 /* describes it. Sanity checking and array size limitations are enforced */
8671 /* in this function to prevent userspace from trying to load in something */
8672 /* that is insanely big. Once the size of the array is known, the memory */
8673 /* required is malloc'd and returned through changing *arrayptr. The */
8674 /* contents of the array are verified before returning. Only in the event */
8675 /* of a successful call is the caller required to free up the malloc area. */
8676 /* ------------------------------------------------------------------------ */
8678 ipf_matcharray_load(softc, data, objp, arrayptr)
8679 ipf_main_softc_t *softc;
8684 int arraysize, *array, error;
8688 error = BCOPYIN(data, objp, sizeof(*objp));
8694 if (objp->ipfo_type != IPFOBJ_IPFEXPR) {
8699 if (((objp->ipfo_size & 3) != 0) || (objp->ipfo_size == 0) ||
8700 (objp->ipfo_size > 1024)) {
8705 arraysize = objp->ipfo_size * sizeof(*array);
8706 KMALLOCS(array, int *, arraysize);
8707 if (array == NULL) {
8712 error = COPYIN(objp->ipfo_ptr, array, arraysize);
8714 KFREES(array, arraysize);
8719 if (ipf_matcharray_verify(array, arraysize) != 0) {
8720 KFREES(array, arraysize);
8730 /* ------------------------------------------------------------------------ */
8731 /* Function: ipf_matcharray_verify */
8733 /* Parameters: array(I) - pointer to matching array */
8734 /* arraysize(I) - number of elements in the array */
8736 /* Verify the contents of a matching array by stepping through each element */
8737 /* in it. The actual commands in the array are not verified for */
8738 /* correctness, only that all of the sizes are correctly within limits. */
8739 /* ------------------------------------------------------------------------ */
8741 ipf_matcharray_verify(array, arraysize)
8742 int *array, arraysize;
8744 int i, nelem, maxidx;
8747 nelem = arraysize / sizeof(*array);
8750 * Currently, it makes no sense to have an array less than 6
8751 * elements long - the initial size at the from, a single operation
8752 * (minimum 4 in length) and a trailer, for a total of 6.
8754 if ((array[0] < 6) || (arraysize < 24) || (arraysize > 4096)) {
8759 * Verify the size of data pointed to by array with how long
8760 * the array claims to be itself.
8762 if (array[0] * sizeof(*array) != arraysize) {
8768 * The last opcode in this array should be an IPF_EXP_END.
8770 if (array[maxidx] != IPF_EXP_END) {
8774 for (i = 1; i < maxidx; ) {
8775 e = (ipfexp_t *)(array + i);
8778 * The length of the bits to check must be at least 1
8779 * (or else there is nothing to comapre with!) and it
8780 * cannot exceed the length of the data present.
8782 if ((e->ipfe_size < 1 ) ||
8783 (e->ipfe_size + i > maxidx)) {
8792 /* ------------------------------------------------------------------------ */
8793 /* Function: ipf_fr_matcharray */
8794 /* Returns: int - 0 = match failed, else positive match */
8795 /* Parameters: fin(I) - pointer to packet information */
8796 /* array(I) - pointer to matching array */
8798 /* This function is used to apply a matching array against a packet and */
8799 /* return an indication of whether or not the packet successfully matches */
8800 /* all of the commands in it. */
8801 /* ------------------------------------------------------------------------ */
8803 ipf_fr_matcharray(fin, array)
8807 int i, n, *x, rv, p;
8814 for (; n > 0; x += 3 + x[3], rv = 0) {
8816 if (e->ipfe_cmd == IPF_EXP_END)
8821 * The upper 16 bits currently store the protocol value.
8822 * This is currently used with TCP and UDP port compares and
8823 * allows "tcp.port = 80" without requiring an explicit
8824 " "ip.pr = tcp" first.
8826 p = e->ipfe_cmd >> 16;
8827 if ((p != 0) && (p != fin->fin_p))
8830 switch (e->ipfe_cmd)
8832 case IPF_EXP_IP_PR :
8833 for (i = 0; !rv && i < e->ipfe_narg; i++) {
8834 rv |= (fin->fin_p == e->ipfe_arg0[i]);
8838 case IPF_EXP_IP_SRCADDR :
8839 if (fin->fin_v != 4)
8841 for (i = 0; !rv && i < e->ipfe_narg; i++) {
8842 rv |= ((fin->fin_saddr &
8843 e->ipfe_arg0[i * 2 + 1]) ==
8844 e->ipfe_arg0[i * 2]);
8848 case IPF_EXP_IP_DSTADDR :
8849 if (fin->fin_v != 4)
8851 for (i = 0; !rv && i < e->ipfe_narg; i++) {
8852 rv |= ((fin->fin_daddr &
8853 e->ipfe_arg0[i * 2 + 1]) ==
8854 e->ipfe_arg0[i * 2]);
8858 case IPF_EXP_IP_ADDR :
8859 if (fin->fin_v != 4)
8861 for (i = 0; !rv && i < e->ipfe_narg; i++) {
8862 rv |= ((fin->fin_saddr &
8863 e->ipfe_arg0[i * 2 + 1]) ==
8864 e->ipfe_arg0[i * 2]) ||
8866 e->ipfe_arg0[i * 2 + 1]) ==
8867 e->ipfe_arg0[i * 2]);
8872 case IPF_EXP_IP6_SRCADDR :
8873 if (fin->fin_v != 6)
8875 for (i = 0; !rv && i < e->ipfe_narg; i++) {
8876 rv |= IP6_MASKEQ(&fin->fin_src6,
8877 &e->ipfe_arg0[i * 8 + 4],
8878 &e->ipfe_arg0[i * 8]);
8882 case IPF_EXP_IP6_DSTADDR :
8883 if (fin->fin_v != 6)
8885 for (i = 0; !rv && i < e->ipfe_narg; i++) {
8886 rv |= IP6_MASKEQ(&fin->fin_dst6,
8887 &e->ipfe_arg0[i * 8 + 4],
8888 &e->ipfe_arg0[i * 8]);
8892 case IPF_EXP_IP6_ADDR :
8893 if (fin->fin_v != 6)
8895 for (i = 0; !rv && i < e->ipfe_narg; i++) {
8896 rv |= IP6_MASKEQ(&fin->fin_src6,
8897 &e->ipfe_arg0[i * 8 + 4],
8898 &e->ipfe_arg0[i * 8]) ||
8899 IP6_MASKEQ(&fin->fin_dst6,
8900 &e->ipfe_arg0[i * 8 + 4],
8901 &e->ipfe_arg0[i * 8]);
8906 case IPF_EXP_UDP_PORT :
8907 case IPF_EXP_TCP_PORT :
8908 for (i = 0; !rv && i < e->ipfe_narg; i++) {
8909 rv |= (fin->fin_sport == e->ipfe_arg0[i]) ||
8910 (fin->fin_dport == e->ipfe_arg0[i]);
8914 case IPF_EXP_UDP_SPORT :
8915 case IPF_EXP_TCP_SPORT :
8916 for (i = 0; !rv && i < e->ipfe_narg; i++) {
8917 rv |= (fin->fin_sport == e->ipfe_arg0[i]);
8921 case IPF_EXP_UDP_DPORT :
8922 case IPF_EXP_TCP_DPORT :
8923 for (i = 0; !rv && i < e->ipfe_narg; i++) {
8924 rv |= (fin->fin_dport == e->ipfe_arg0[i]);
8928 case IPF_EXP_TCP_FLAGS :
8929 for (i = 0; !rv && i < e->ipfe_narg; i++) {
8930 rv |= ((fin->fin_tcpf &
8931 e->ipfe_arg0[i * 2 + 1]) ==
8932 e->ipfe_arg0[i * 2]);
8946 /* ------------------------------------------------------------------------ */
8947 /* Function: ipf_queueflush */
8948 /* Returns: int - number of entries flushed (0 = none) */
8949 /* Parameters: softc(I) - pointer to soft context main structure */
8950 /* deletefn(I) - function to call to delete entry */
8951 /* ipfqs(I) - top of the list of ipf internal queues */
8952 /* userqs(I) - top of the list of user defined timeouts */
8954 /* This fucntion gets called when the state/NAT hash tables fill up and we */
8955 /* need to try a bit harder to free up some space. The algorithm used here */
8956 /* split into two parts but both halves have the same goal: to reduce the */
8957 /* number of connections considered to be "active" to the low watermark. */
8958 /* There are two steps in doing this: */
8959 /* 1) Remove any TCP connections that are already considered to be "closed" */
8960 /* but have not yet been removed from the state table. The two states */
8961 /* TCPS_TIME_WAIT and TCPS_CLOSED are considered to be the perfect */
8962 /* candidates for this style of removal. If freeing up entries in */
8963 /* CLOSED or both CLOSED and TIME_WAIT brings us to the low watermark, */
8964 /* we do not go on to step 2. */
8966 /* 2) Look for the oldest entries on each timeout queue and free them if */
8967 /* they are within the given window we are considering. Where the */
8968 /* window starts and the steps taken to increase its size depend upon */
8969 /* how long ipf has been running (ipf_ticks.) Anything modified in the */
8970 /* last 30 seconds is not touched. */
8972 /* die ipf_ticks 30*1.5 1800*1.5 | 43200*1.5 */
8974 /* future <--+----------+--------+-----------+-----+-----+-----------> past */
8975 /* now \_int=30s_/ \_int=1hr_/ \_int=12hr */
8977 /* Points to note: */
8978 /* - tqe_die is the time, in the future, when entries die. */
8979 /* - tqe_die - ipf_ticks is how long left the connection has to live in ipf */
8981 /* - tqe_touched is when the entry was last used by NAT/state */
8982 /* - the closer tqe_touched is to ipf_ticks, the further tqe_die will be */
8983 /* ipf_ticks any given timeout queue and vice versa. */
8984 /* - both tqe_die and tqe_touched increase over time */
8985 /* - timeout queues are sorted with the highest value of tqe_die at the */
8986 /* bottom and therefore the smallest values of each are at the top */
8987 /* - the pointer passed in as ipfqs should point to an array of timeout */
8988 /* queues representing each of the TCP states */
8990 /* We start by setting up a maximum range to scan for things to move of */
8991 /* iend (newest) to istart (oldest) in chunks of "interval". If nothing is */
8992 /* found in that range, "interval" is adjusted (so long as it isn't 30) and */
8993 /* we start again with a new value for "iend" and "istart". This is */
8994 /* continued until we either finish the scan of 30 second intervals or the */
8995 /* low water mark is reached. */
8996 /* ------------------------------------------------------------------------ */
8998 ipf_queueflush(softc, deletefn, ipfqs, userqs, activep, size, low)
8999 ipf_main_softc_t *softc;
9000 ipftq_delete_fn_t deletefn;
9001 ipftq_t *ipfqs, *userqs;
9005 u_long interval, istart, iend;
9006 ipftq_t *ifq, *ifqnext;
9007 ipftqent_t *tqe, *tqn;
9010 for (tqn = ipfqs[IPF_TCPS_CLOSED].ifq_head; ((tqe = tqn) != NULL); ) {
9011 tqn = tqe->tqe_next;
9012 if ((*deletefn)(softc, tqe->tqe_parent) == 0)
9015 if ((*activep * 100 / size) > low) {
9016 for (tqn = ipfqs[IPF_TCPS_TIME_WAIT].ifq_head;
9017 ((tqe = tqn) != NULL); ) {
9018 tqn = tqe->tqe_next;
9019 if ((*deletefn)(softc, tqe->tqe_parent) == 0)
9024 if ((*activep * 100 / size) <= low) {
9029 * NOTE: Use of "* 15 / 10" is required here because if "* 1.5" is
9030 * used then the operations are upgraded to floating point
9031 * and kernels don't like floating point...
9033 if (softc->ipf_ticks > IPF_TTLVAL(43200 * 15 / 10)) {
9034 istart = IPF_TTLVAL(86400 * 4);
9035 interval = IPF_TTLVAL(43200);
9036 } else if (softc->ipf_ticks > IPF_TTLVAL(1800 * 15 / 10)) {
9037 istart = IPF_TTLVAL(43200);
9038 interval = IPF_TTLVAL(1800);
9039 } else if (softc->ipf_ticks > IPF_TTLVAL(30 * 15 / 10)) {
9040 istart = IPF_TTLVAL(1800);
9041 interval = IPF_TTLVAL(30);
9045 if (istart > softc->ipf_ticks) {
9046 if (softc->ipf_ticks - interval < interval)
9049 istart = (softc->ipf_ticks / interval) * interval;
9052 iend = softc->ipf_ticks - interval;
9054 while ((*activep * 100 / size) > low) {
9057 try = softc->ipf_ticks - istart;
9059 for (ifq = ipfqs; ifq != NULL; ifq = ifq->ifq_next) {
9060 for (tqn = ifq->ifq_head; ((tqe = tqn) != NULL); ) {
9061 if (try < tqe->tqe_touched)
9063 tqn = tqe->tqe_next;
9064 if ((*deletefn)(softc, tqe->tqe_parent) == 0)
9069 for (ifq = userqs; ifq != NULL; ifq = ifqnext) {
9070 ifqnext = ifq->ifq_next;
9072 for (tqn = ifq->ifq_head; ((tqe = tqn) != NULL); ) {
9073 if (try < tqe->tqe_touched)
9075 tqn = tqe->tqe_next;
9076 if ((*deletefn)(softc, tqe->tqe_parent) == 0)
9082 if (interval == IPF_TTLVAL(43200)) {
9083 interval = IPF_TTLVAL(1800);
9084 } else if (interval == IPF_TTLVAL(1800)) {
9085 interval = IPF_TTLVAL(30);
9089 if (interval >= softc->ipf_ticks)
9092 iend = softc->ipf_ticks - interval;
9101 /* ------------------------------------------------------------------------ */
9102 /* Function: ipf_deliverlocal */
9103 /* Returns: int - 1 = local address, 0 = non-local address */
9104 /* Parameters: softc(I) - pointer to soft context main structure */
9105 /* ipversion(I) - IP protocol version (4 or 6) */
9106 /* ifp(I) - network interface pointer */
9107 /* ipaddr(I) - IPv4/6 destination address */
9109 /* This fucntion is used to determine in the address "ipaddr" belongs to */
9110 /* the network interface represented by ifp. */
9111 /* ------------------------------------------------------------------------ */
9113 ipf_deliverlocal(softc, ipversion, ifp, ipaddr)
9114 ipf_main_softc_t *softc;
9122 if (ipversion == 4) {
9123 if (ipf_ifpaddr(softc, 4, FRI_NORMAL, ifp, &addr, NULL) == 0) {
9124 if (addr.in4.s_addr == ipaddr->in4.s_addr)
9129 } else if (ipversion == 6) {
9130 if (ipf_ifpaddr(softc, 6, FRI_NORMAL, ifp, &addr, NULL) == 0) {
9131 if (IP6_EQ(&addr, ipaddr))
9141 /* ------------------------------------------------------------------------ */
9142 /* Function: ipf_settimeout */
9143 /* Returns: int - 0 = success, -1 = failure */
9144 /* Parameters: softc(I) - pointer to soft context main structure */
9145 /* t(I) - pointer to tuneable array entry */
9146 /* p(I) - pointer to values passed in to apply */
9148 /* This function is called to set the timeout values for each distinct */
9149 /* queue timeout that is available. When called, it calls into both the */
9150 /* state and NAT code, telling them to update their timeout queues. */
9151 /* ------------------------------------------------------------------------ */
9153 ipf_settimeout(softc, t, p)
9154 struct ipf_main_softc_s *softc;
9160 * ipf_interror should be set by the functions called here, not
9161 * by this function - it's just a middle man.
9163 if (ipf_state_settimeout(softc, t, p) == -1)
9165 if (ipf_nat_settimeout(softc, t, p) == -1)
9171 /* ------------------------------------------------------------------------ */
9172 /* Function: ipf_apply_timeout */
9173 /* Returns: int - 0 = success, -1 = failure */
9174 /* Parameters: head(I) - pointer to tuneable array entry */
9175 /* seconds(I) - pointer to values passed in to apply */
9177 /* This function applies a timeout of "seconds" to the timeout queue that */
9178 /* is pointed to by "head". All entries on this list have an expiration */
9179 /* set to be the current tick value of ipf plus the ttl. Given that this */
9180 /* function should only be called when the delta is non-zero, the task is */
9181 /* to walk the entire list and apply the change. The sort order will not */
9182 /* change. The only catch is that this is O(n) across the list, so if the */
9183 /* queue has lots of entries (10s of thousands or 100s of thousands), it */
9184 /* could take a relatively long time to work through them all. */
9185 /* ------------------------------------------------------------------------ */
9187 ipf_apply_timeout(head, seconds)
9191 u_int oldtimeout, newtimeout;
9195 MUTEX_ENTER(&head->ifq_lock);
9196 oldtimeout = head->ifq_ttl;
9197 newtimeout = IPF_TTLVAL(seconds);
9198 delta = oldtimeout - newtimeout;
9200 head->ifq_ttl = newtimeout;
9202 for (tqe = head->ifq_head; tqe != NULL; tqe = tqe->tqe_next) {
9203 tqe->tqe_die += delta;
9205 MUTEX_EXIT(&head->ifq_lock);
9209 /* ------------------------------------------------------------------------ */
9210 /* Function: ipf_settimeout_tcp */
9211 /* Returns: int - 0 = successfully applied, -1 = failed */
9212 /* Parameters: t(I) - pointer to tuneable to change */
9213 /* p(I) - pointer to new timeout information */
9214 /* tab(I) - pointer to table of TCP queues */
9216 /* This function applies the new timeout (p) to the TCP tunable (t) and */
9217 /* updates all of the entries on the relevant timeout queue by calling */
9218 /* ipf_apply_timeout(). */
9219 /* ------------------------------------------------------------------------ */
9221 ipf_settimeout_tcp(t, p, tab)
9226 if (!strcmp(t->ipft_name, "tcp_idle_timeout") ||
9227 !strcmp(t->ipft_name, "tcp_established")) {
9228 ipf_apply_timeout(&tab[IPF_TCPS_ESTABLISHED], p->ipftu_int);
9229 } else if (!strcmp(t->ipft_name, "tcp_close_wait")) {
9230 ipf_apply_timeout(&tab[IPF_TCPS_CLOSE_WAIT], p->ipftu_int);
9231 } else if (!strcmp(t->ipft_name, "tcp_last_ack")) {
9232 ipf_apply_timeout(&tab[IPF_TCPS_LAST_ACK], p->ipftu_int);
9233 } else if (!strcmp(t->ipft_name, "tcp_timeout")) {
9234 ipf_apply_timeout(&tab[IPF_TCPS_LISTEN], p->ipftu_int);
9235 ipf_apply_timeout(&tab[IPF_TCPS_HALF_ESTAB], p->ipftu_int);
9236 ipf_apply_timeout(&tab[IPF_TCPS_CLOSING], p->ipftu_int);
9237 } else if (!strcmp(t->ipft_name, "tcp_listen")) {
9238 ipf_apply_timeout(&tab[IPF_TCPS_LISTEN], p->ipftu_int);
9239 } else if (!strcmp(t->ipft_name, "tcp_half_established")) {
9240 ipf_apply_timeout(&tab[IPF_TCPS_HALF_ESTAB], p->ipftu_int);
9241 } else if (!strcmp(t->ipft_name, "tcp_closing")) {
9242 ipf_apply_timeout(&tab[IPF_TCPS_CLOSING], p->ipftu_int);
9243 } else if (!strcmp(t->ipft_name, "tcp_syn_received")) {
9244 ipf_apply_timeout(&tab[IPF_TCPS_SYN_RECEIVED], p->ipftu_int);
9245 } else if (!strcmp(t->ipft_name, "tcp_syn_sent")) {
9246 ipf_apply_timeout(&tab[IPF_TCPS_SYN_SENT], p->ipftu_int);
9247 } else if (!strcmp(t->ipft_name, "tcp_closed")) {
9248 ipf_apply_timeout(&tab[IPF_TCPS_CLOSED], p->ipftu_int);
9249 } else if (!strcmp(t->ipft_name, "tcp_half_closed")) {
9250 ipf_apply_timeout(&tab[IPF_TCPS_CLOSED], p->ipftu_int);
9251 } else if (!strcmp(t->ipft_name, "tcp_time_wait")) {
9252 ipf_apply_timeout(&tab[IPF_TCPS_TIME_WAIT], p->ipftu_int);
9255 * ipf_interror isn't set here because it should be set
9256 * by whatever called this function.
9264 /* ------------------------------------------------------------------------ */
9265 /* Function: ipf_main_soft_create */
9266 /* Returns: NULL = failure, else success */
9267 /* Parameters: arg(I) - pointer to soft context structure if already allocd */
9269 /* Create the foundation soft context structure. In circumstances where it */
9270 /* is not required to dynamically allocate the context, a pointer can be */
9271 /* passed in (rather than NULL) to a structure to be initialised. */
9272 /* The main thing of interest is that a number of locks are initialised */
9273 /* here instead of in the where might be expected - in the relevant create */
9274 /* function elsewhere. This is done because the current locking design has */
9275 /* some areas where these locks are used outside of their module. */
9276 /* Possibly the most important exercise that is done here is setting of all */
9277 /* the timeout values, allowing them to be changed before init(). */
9278 /* ------------------------------------------------------------------------ */
9280 ipf_main_soft_create(arg)
9283 ipf_main_softc_t *softc;
9286 KMALLOC(softc, ipf_main_softc_t *);
9293 bzero((char *)softc, sizeof(*softc));
9296 * This serves as a flag as to whether or not the softc should be
9297 * free'd when _destroy is called.
9299 softc->ipf_dynamic_softc = (arg == NULL) ? 1 : 0;
9301 softc->ipf_tuners = ipf_tune_array_copy(softc,
9302 sizeof(ipf_main_tuneables),
9303 ipf_main_tuneables);
9304 if (softc->ipf_tuners == NULL) {
9305 ipf_main_soft_destroy(softc);
9309 MUTEX_INIT(&softc->ipf_rw, "ipf rw mutex");
9310 MUTEX_INIT(&softc->ipf_timeoutlock, "ipf timeout lock");
9311 RWLOCK_INIT(&softc->ipf_global, "ipf filter load/unload mutex");
9312 RWLOCK_INIT(&softc->ipf_mutex, "ipf filter rwlock");
9313 RWLOCK_INIT(&softc->ipf_tokens, "ipf token rwlock");
9314 RWLOCK_INIT(&softc->ipf_state, "ipf state rwlock");
9315 RWLOCK_INIT(&softc->ipf_nat, "ipf IP NAT rwlock");
9316 RWLOCK_INIT(&softc->ipf_poolrw, "ipf pool rwlock");
9317 RWLOCK_INIT(&softc->ipf_frag, "ipf frag rwlock");
9319 softc->ipf_token_head = NULL;
9320 softc->ipf_token_tail = &softc->ipf_token_head;
9322 softc->ipf_tcpidletimeout = FIVE_DAYS;
9323 softc->ipf_tcpclosewait = IPF_TTLVAL(2 * TCP_MSL);
9324 softc->ipf_tcplastack = IPF_TTLVAL(30);
9325 softc->ipf_tcptimewait = IPF_TTLVAL(2 * TCP_MSL);
9326 softc->ipf_tcptimeout = IPF_TTLVAL(2 * TCP_MSL);
9327 softc->ipf_tcpsynsent = IPF_TTLVAL(2 * TCP_MSL);
9328 softc->ipf_tcpsynrecv = IPF_TTLVAL(2 * TCP_MSL);
9329 softc->ipf_tcpclosed = IPF_TTLVAL(30);
9330 softc->ipf_tcphalfclosed = IPF_TTLVAL(2 * 3600);
9331 softc->ipf_udptimeout = IPF_TTLVAL(120);
9332 softc->ipf_udpacktimeout = IPF_TTLVAL(12);
9333 softc->ipf_icmptimeout = IPF_TTLVAL(60);
9334 softc->ipf_icmpacktimeout = IPF_TTLVAL(6);
9335 softc->ipf_iptimeout = IPF_TTLVAL(60);
9337 #if defined(IPFILTER_DEFAULT_BLOCK)
9338 softc->ipf_pass = FR_BLOCK|FR_NOMATCH;
9340 softc->ipf_pass = (IPF_DEFAULT_PASS)|FR_NOMATCH;
9342 softc->ipf_minttl = 4;
9343 softc->ipf_icmpminfragmtu = 68;
9344 softc->ipf_flags = IPF_LOGGING;
9349 /* ------------------------------------------------------------------------ */
9350 /* Function: ipf_main_soft_init */
9351 /* Returns: 0 = success, -1 = failure */
9352 /* Parameters: softc(I) - pointer to soft context main structure */
9354 /* A null-op function that exists as a placeholder so that the flow in */
9355 /* other functions is obvious. */
9356 /* ------------------------------------------------------------------------ */
9359 ipf_main_soft_init(softc)
9360 ipf_main_softc_t *softc;
9366 /* ------------------------------------------------------------------------ */
9367 /* Function: ipf_main_soft_destroy */
9369 /* Parameters: softc(I) - pointer to soft context main structure */
9371 /* Undo everything that we did in ipf_main_soft_create. */
9373 /* The most important check that needs to be made here is whether or not */
9374 /* the structure was allocated by ipf_main_soft_create() by checking what */
9375 /* value is stored in ipf_dynamic_main. */
9376 /* ------------------------------------------------------------------------ */
9379 ipf_main_soft_destroy(softc)
9380 ipf_main_softc_t *softc;
9383 RW_DESTROY(&softc->ipf_frag);
9384 RW_DESTROY(&softc->ipf_poolrw);
9385 RW_DESTROY(&softc->ipf_nat);
9386 RW_DESTROY(&softc->ipf_state);
9387 RW_DESTROY(&softc->ipf_tokens);
9388 RW_DESTROY(&softc->ipf_mutex);
9389 RW_DESTROY(&softc->ipf_global);
9390 MUTEX_DESTROY(&softc->ipf_timeoutlock);
9391 MUTEX_DESTROY(&softc->ipf_rw);
9393 if (softc->ipf_tuners != NULL) {
9394 KFREES(softc->ipf_tuners, sizeof(ipf_main_tuneables));
9396 if (softc->ipf_dynamic_softc == 1) {
9402 /* ------------------------------------------------------------------------ */
9403 /* Function: ipf_main_soft_fini */
9404 /* Returns: 0 = success, -1 = failure */
9405 /* Parameters: softc(I) - pointer to soft context main structure */
9407 /* Clean out the rules which have been added since _init was last called, */
9408 /* the only dynamic part of the mainline. */
9409 /* ------------------------------------------------------------------------ */
9411 ipf_main_soft_fini(softc)
9412 ipf_main_softc_t *softc;
9414 (void) ipf_flush(softc, IPL_LOGIPF, FR_INQUE|FR_OUTQUE|FR_INACTIVE);
9415 (void) ipf_flush(softc, IPL_LOGIPF, FR_INQUE|FR_OUTQUE);
9416 (void) ipf_flush(softc, IPL_LOGCOUNT, FR_INQUE|FR_OUTQUE|FR_INACTIVE);
9417 (void) ipf_flush(softc, IPL_LOGCOUNT, FR_INQUE|FR_OUTQUE);
9423 /* ------------------------------------------------------------------------ */
9424 /* Function: ipf_main_load */
9425 /* Returns: 0 = success, -1 = failure */
9426 /* Parameters: none */
9428 /* Handle global initialisation that needs to be done for the base part of */
9429 /* IPFilter. At present this just amounts to initialising some ICMP lookup */
9430 /* arrays that get used by the state/NAT code. */
9431 /* ------------------------------------------------------------------------ */
9437 /* fill icmp reply type table */
9438 for (i = 0; i <= ICMP_MAXTYPE; i++)
9439 icmpreplytype4[i] = -1;
9440 icmpreplytype4[ICMP_ECHO] = ICMP_ECHOREPLY;
9441 icmpreplytype4[ICMP_TSTAMP] = ICMP_TSTAMPREPLY;
9442 icmpreplytype4[ICMP_IREQ] = ICMP_IREQREPLY;
9443 icmpreplytype4[ICMP_MASKREQ] = ICMP_MASKREPLY;
9446 /* fill icmp reply type table */
9447 for (i = 0; i <= ICMP6_MAXTYPE; i++)
9448 icmpreplytype6[i] = -1;
9449 icmpreplytype6[ICMP6_ECHO_REQUEST] = ICMP6_ECHO_REPLY;
9450 icmpreplytype6[ICMP6_MEMBERSHIP_QUERY] = ICMP6_MEMBERSHIP_REPORT;
9451 icmpreplytype6[ICMP6_NI_QUERY] = ICMP6_NI_REPLY;
9452 icmpreplytype6[ND_ROUTER_SOLICIT] = ND_ROUTER_ADVERT;
9453 icmpreplytype6[ND_NEIGHBOR_SOLICIT] = ND_NEIGHBOR_ADVERT;
9460 /* ------------------------------------------------------------------------ */
9461 /* Function: ipf_main_unload */
9462 /* Returns: 0 = success, -1 = failure */
9463 /* Parameters: none */
9465 /* A null-op function that exists as a placeholder so that the flow in */
9466 /* other functions is obvious. */
9467 /* ------------------------------------------------------------------------ */
9475 /* ------------------------------------------------------------------------ */
9476 /* Function: ipf_load_all */
9477 /* Returns: 0 = success, -1 = failure */
9478 /* Parameters: none */
9480 /* Work through all of the subsystems inside IPFilter and call the load */
9481 /* function for each in an order that won't lead to a crash :) */
9482 /* ------------------------------------------------------------------------ */
9486 if (ipf_main_load() == -1)
9489 if (ipf_state_main_load() == -1)
9492 if (ipf_nat_main_load() == -1)
9495 if (ipf_frag_main_load() == -1)
9498 if (ipf_auth_main_load() == -1)
9501 if (ipf_proxy_main_load() == -1)
9508 /* ------------------------------------------------------------------------ */
9509 /* Function: ipf_unload_all */
9510 /* Returns: 0 = success, -1 = failure */
9511 /* Parameters: none */
9513 /* Work through all of the subsystems inside IPFilter and call the unload */
9514 /* function for each in an order that won't lead to a crash :) */
9515 /* ------------------------------------------------------------------------ */
9519 if (ipf_proxy_main_unload() == -1)
9522 if (ipf_auth_main_unload() == -1)
9525 if (ipf_frag_main_unload() == -1)
9528 if (ipf_nat_main_unload() == -1)
9531 if (ipf_state_main_unload() == -1)
9534 if (ipf_main_unload() == -1)
9541 /* ------------------------------------------------------------------------ */
9542 /* Function: ipf_create_all */
9543 /* Returns: NULL = failure, else success */
9544 /* Parameters: arg(I) - pointer to soft context main structure */
9546 /* Work through all of the subsystems inside IPFilter and call the create */
9547 /* function for each in an order that won't lead to a crash :) */
9548 /* ------------------------------------------------------------------------ */
9553 ipf_main_softc_t *softc;
9555 softc = ipf_main_soft_create(arg);
9560 softc->ipf_log_soft = ipf_log_soft_create(softc);
9561 if (softc->ipf_log_soft == NULL) {
9562 ipf_destroy_all(softc);
9567 softc->ipf_lookup_soft = ipf_lookup_soft_create(softc);
9568 if (softc->ipf_lookup_soft == NULL) {
9569 ipf_destroy_all(softc);
9573 softc->ipf_sync_soft = ipf_sync_soft_create(softc);
9574 if (softc->ipf_sync_soft == NULL) {
9575 ipf_destroy_all(softc);
9579 softc->ipf_state_soft = ipf_state_soft_create(softc);
9580 if (softc->ipf_state_soft == NULL) {
9581 ipf_destroy_all(softc);
9585 softc->ipf_nat_soft = ipf_nat_soft_create(softc);
9586 if (softc->ipf_nat_soft == NULL) {
9587 ipf_destroy_all(softc);
9591 softc->ipf_frag_soft = ipf_frag_soft_create(softc);
9592 if (softc->ipf_frag_soft == NULL) {
9593 ipf_destroy_all(softc);
9597 softc->ipf_auth_soft = ipf_auth_soft_create(softc);
9598 if (softc->ipf_auth_soft == NULL) {
9599 ipf_destroy_all(softc);
9603 softc->ipf_proxy_soft = ipf_proxy_soft_create(softc);
9604 if (softc->ipf_proxy_soft == NULL) {
9605 ipf_destroy_all(softc);
9613 /* ------------------------------------------------------------------------ */
9614 /* Function: ipf_destroy_all */
9616 /* Parameters: softc(I) - pointer to soft context main structure */
9618 /* Work through all of the subsystems inside IPFilter and call the destroy */
9619 /* function for each in an order that won't lead to a crash :) */
9621 /* Every one of these functions is expected to succeed, so there is no */
9622 /* checking of return values. */
9623 /* ------------------------------------------------------------------------ */
9625 ipf_destroy_all(softc)
9626 ipf_main_softc_t *softc;
9629 if (softc->ipf_state_soft != NULL) {
9630 ipf_state_soft_destroy(softc, softc->ipf_state_soft);
9631 softc->ipf_state_soft = NULL;
9634 if (softc->ipf_nat_soft != NULL) {
9635 ipf_nat_soft_destroy(softc, softc->ipf_nat_soft);
9636 softc->ipf_nat_soft = NULL;
9639 if (softc->ipf_frag_soft != NULL) {
9640 ipf_frag_soft_destroy(softc, softc->ipf_frag_soft);
9641 softc->ipf_frag_soft = NULL;
9644 if (softc->ipf_auth_soft != NULL) {
9645 ipf_auth_soft_destroy(softc, softc->ipf_auth_soft);
9646 softc->ipf_auth_soft = NULL;
9649 if (softc->ipf_proxy_soft != NULL) {
9650 ipf_proxy_soft_destroy(softc, softc->ipf_proxy_soft);
9651 softc->ipf_proxy_soft = NULL;
9654 if (softc->ipf_sync_soft != NULL) {
9655 ipf_sync_soft_destroy(softc, softc->ipf_sync_soft);
9656 softc->ipf_sync_soft = NULL;
9659 if (softc->ipf_lookup_soft != NULL) {
9660 ipf_lookup_soft_destroy(softc, softc->ipf_lookup_soft);
9661 softc->ipf_lookup_soft = NULL;
9665 if (softc->ipf_log_soft != NULL) {
9666 ipf_log_soft_destroy(softc, softc->ipf_log_soft);
9667 softc->ipf_log_soft = NULL;
9671 ipf_main_soft_destroy(softc);
9675 /* ------------------------------------------------------------------------ */
9676 /* Function: ipf_init_all */
9677 /* Returns: 0 = success, -1 = failure */
9678 /* Parameters: softc(I) - pointer to soft context main structure */
9680 /* Work through all of the subsystems inside IPFilter and call the init */
9681 /* function for each in an order that won't lead to a crash :) */
9682 /* ------------------------------------------------------------------------ */
9685 ipf_main_softc_t *softc;
9688 if (ipf_main_soft_init(softc) == -1)
9692 if (ipf_log_soft_init(softc, softc->ipf_log_soft) == -1)
9696 if (ipf_lookup_soft_init(softc, softc->ipf_lookup_soft) == -1)
9699 if (ipf_sync_soft_init(softc, softc->ipf_sync_soft) == -1)
9702 if (ipf_state_soft_init(softc, softc->ipf_state_soft) == -1)
9705 if (ipf_nat_soft_init(softc, softc->ipf_nat_soft) == -1)
9708 if (ipf_frag_soft_init(softc, softc->ipf_frag_soft) == -1)
9711 if (ipf_auth_soft_init(softc, softc->ipf_auth_soft) == -1)
9714 if (ipf_proxy_soft_init(softc, softc->ipf_proxy_soft) == -1)
9721 /* ------------------------------------------------------------------------ */
9722 /* Function: ipf_fini_all */
9723 /* Returns: 0 = success, -1 = failure */
9724 /* Parameters: softc(I) - pointer to soft context main structure */
9726 /* Work through all of the subsystems inside IPFilter and call the fini */
9727 /* function for each in an order that won't lead to a crash :) */
9728 /* ------------------------------------------------------------------------ */
9731 ipf_main_softc_t *softc;
9734 ipf_token_flush(softc);
9736 if (ipf_proxy_soft_fini(softc, softc->ipf_proxy_soft) == -1)
9739 if (ipf_auth_soft_fini(softc, softc->ipf_auth_soft) == -1)
9742 if (ipf_frag_soft_fini(softc, softc->ipf_frag_soft) == -1)
9745 if (ipf_nat_soft_fini(softc, softc->ipf_nat_soft) == -1)
9748 if (ipf_state_soft_fini(softc, softc->ipf_state_soft) == -1)
9751 if (ipf_sync_soft_fini(softc, softc->ipf_sync_soft) == -1)
9754 if (ipf_lookup_soft_fini(softc, softc->ipf_lookup_soft) == -1)
9758 if (ipf_log_soft_fini(softc, softc->ipf_log_soft) == -1)
9762 if (ipf_main_soft_fini(softc) == -1)
9769 /* ------------------------------------------------------------------------ */
9770 /* Function: ipf_rule_expire */
9772 /* Parameters: softc(I) - pointer to soft context main structure */
9774 /* At present this function exists just to support temporary addition of */
9775 /* firewall rules. Both inactive and active lists are scanned for items to */
9776 /* purge, as by rights, the expiration is computed as soon as the rule is */
9778 /* ------------------------------------------------------------------------ */
9780 ipf_rule_expire(softc)
9781 ipf_main_softc_t *softc;
9785 if ((softc->ipf_rule_explist[0] == NULL) &&
9786 (softc->ipf_rule_explist[1] == NULL))
9789 WRITE_ENTER(&softc->ipf_mutex);
9791 while ((fr = softc->ipf_rule_explist[0]) != NULL) {
9793 * Because the list is kept sorted on insertion, the fist
9794 * one that dies in the future means no more work to do.
9796 if (fr->fr_die > softc->ipf_ticks)
9798 ipf_rule_delete(softc, fr, IPL_LOGIPF, 0);
9801 while ((fr = softc->ipf_rule_explist[1]) != NULL) {
9803 * Because the list is kept sorted on insertion, the fist
9804 * one that dies in the future means no more work to do.
9806 if (fr->fr_die > softc->ipf_ticks)
9808 ipf_rule_delete(softc, fr, IPL_LOGIPF, 1);
9811 RWLOCK_EXIT(&softc->ipf_mutex);
9815 static int ipf_ht_node_cmp __P((struct host_node_s *, struct host_node_s *));
9816 static void ipf_ht_node_make_key __P((host_track_t *, host_node_t *, int,
9819 host_node_t RBI_ZERO(ipf_rb);
9820 RBI_CODE(ipf_rb, host_node_t, hn_entry, ipf_ht_node_cmp)
9823 /* ------------------------------------------------------------------------ */
9824 /* Function: ipf_ht_node_cmp */
9825 /* Returns: int - 0 == nodes are the same, .. */
9826 /* Parameters: k1(I) - pointer to first key to compare */
9827 /* k2(I) - pointer to second key to compare */
9829 /* The "key" for the node is a combination of two fields: the address */
9830 /* family and the address itself. */
9832 /* Because we're not actually interpreting the address data, it isn't */
9833 /* necessary to convert them to/from network/host byte order. The mask is */
9834 /* just used to remove bits that aren't significant - it doesn't matter */
9835 /* where they are, as long as they're always in the same place. */
9837 /* As with IP6_EQ, comparing IPv6 addresses starts at the bottom because */
9838 /* this is where individual ones will differ the most - but not true for */
9839 /* for /48's, etc. */
9840 /* ------------------------------------------------------------------------ */
9842 ipf_ht_node_cmp(k1, k2)
9843 struct host_node_s *k1, *k2;
9847 i = (k2->hn_addr.adf_family - k1->hn_addr.adf_family);
9851 if (k1->hn_addr.adf_family == AF_INET)
9852 return (k2->hn_addr.adf_addr.in4.s_addr -
9853 k1->hn_addr.adf_addr.in4.s_addr);
9855 i = k2->hn_addr.adf_addr.i6[3] - k1->hn_addr.adf_addr.i6[3];
9858 i = k2->hn_addr.adf_addr.i6[2] - k1->hn_addr.adf_addr.i6[2];
9861 i = k2->hn_addr.adf_addr.i6[1] - k1->hn_addr.adf_addr.i6[1];
9864 i = k2->hn_addr.adf_addr.i6[0] - k1->hn_addr.adf_addr.i6[0];
9869 /* ------------------------------------------------------------------------ */
9870 /* Function: ipf_ht_node_make_key */
9872 /* parameters: htp(I) - pointer to address tracking structure */
9873 /* key(I) - where to store masked address for lookup */
9874 /* family(I) - protocol family of address */
9875 /* addr(I) - pointer to network address */
9877 /* Using the "netmask" (number of bits) stored parent host tracking struct, */
9878 /* copy the address passed in into the key structure whilst masking out the */
9879 /* bits that we don't want. */
9881 /* Because the parser will set ht_netmask to 128 if there is no protocol */
9882 /* specified (the parser doesn't know if it should be a v4 or v6 rule), we */
9883 /* have to be wary of that and not allow 32-128 to happen. */
9884 /* ------------------------------------------------------------------------ */
9886 ipf_ht_node_make_key(htp, key, family, addr)
9892 key->hn_addr.adf_family = family;
9893 if (family == AF_INET) {
9897 key->hn_addr.adf_len = sizeof(key->hn_addr.adf_addr.in4);
9898 bits = htp->ht_netmask;
9902 mask = htonl(0xffffffff << (32 - bits));
9904 key->hn_addr.adf_addr.in4.s_addr = addr->in4.s_addr & mask;
9907 int bits = htp->ht_netmask;
9909 key->hn_addr.adf_len = sizeof(key->hn_addr.adf_addr.in6);
9911 key->hn_addr.adf_addr.i6[3] = addr->i6[3] &
9912 htonl(0xffffffff << (128 - bits));
9913 key->hn_addr.adf_addr.i6[2] = addr->i6[2];
9914 key->hn_addr.adf_addr.i6[1] = addr->i6[2];
9915 key->hn_addr.adf_addr.i6[0] = addr->i6[2];
9916 } else if (bits > 64) {
9917 key->hn_addr.adf_addr.i6[3] = 0;
9918 key->hn_addr.adf_addr.i6[2] = addr->i6[2] &
9919 htonl(0xffffffff << (96 - bits));
9920 key->hn_addr.adf_addr.i6[1] = addr->i6[1];
9921 key->hn_addr.adf_addr.i6[0] = addr->i6[0];
9922 } else if (bits > 32) {
9923 key->hn_addr.adf_addr.i6[3] = 0;
9924 key->hn_addr.adf_addr.i6[2] = 0;
9925 key->hn_addr.adf_addr.i6[1] = addr->i6[1] &
9926 htonl(0xffffffff << (64 - bits));
9927 key->hn_addr.adf_addr.i6[0] = addr->i6[0];
9929 key->hn_addr.adf_addr.i6[3] = 0;
9930 key->hn_addr.adf_addr.i6[2] = 0;
9931 key->hn_addr.adf_addr.i6[1] = 0;
9932 key->hn_addr.adf_addr.i6[0] = addr->i6[0] &
9933 htonl(0xffffffff << (32 - bits));
9940 /* ------------------------------------------------------------------------ */
9941 /* Function: ipf_ht_node_add */
9942 /* Returns: int - 0 == success, -1 == failure */
9943 /* Parameters: softc(I) - pointer to soft context main structure */
9944 /* htp(I) - pointer to address tracking structure */
9945 /* family(I) - protocol family of address */
9946 /* addr(I) - pointer to network address */
9948 /* NOTE: THIS FUNCTION MUST BE CALLED WITH AN EXCLUSIVE LOCK THAT PREVENTS */
9949 /* ipf_ht_node_del FROM RUNNING CONCURRENTLY ON THE SAME htp. */
9951 /* After preparing the key with the address information to find, look in */
9952 /* the red-black tree to see if the address is known. A successful call to */
9953 /* this function can mean one of two things: a new node was added to the */
9954 /* tree or a matching node exists and we're able to bump up its activity. */
9955 /* ------------------------------------------------------------------------ */
9957 ipf_ht_node_add(softc, htp, family, addr)
9958 ipf_main_softc_t *softc;
9966 ipf_ht_node_make_key(htp, &k, family, addr);
9968 h = RBI_SEARCH(ipf_rb, &htp->ht_root, &k);
9970 if (htp->ht_cur_nodes >= htp->ht_max_nodes)
9972 KMALLOC(h, host_node_t *);
9975 LBUMP(ipf_rb_no_mem);
9980 * If there was a macro to initialise the RB node then that
9981 * would get used here, but there isn't...
9983 bzero((char *)h, sizeof(*h));
9984 h->hn_addr = k.hn_addr;
9985 h->hn_addr.adf_family = k.hn_addr.adf_family;
9986 RBI_INSERT(ipf_rb, &htp->ht_root, h);
9987 htp->ht_cur_nodes++;
9989 if ((htp->ht_max_per_node != 0) &&
9990 (h->hn_active >= htp->ht_max_per_node)) {
9991 DT(ipf_rb_node_max);
9992 LBUMP(ipf_rb_node_max);
10003 /* ------------------------------------------------------------------------ */
10004 /* Function: ipf_ht_node_del */
10005 /* Returns: int - 0 == success, -1 == failure */
10006 /* parameters: htp(I) - pointer to address tracking structure */
10007 /* family(I) - protocol family of address */
10008 /* addr(I) - pointer to network address */
10010 /* NOTE: THIS FUNCTION MUST BE CALLED WITH AN EXCLUSIVE LOCK THAT PREVENTS */
10011 /* ipf_ht_node_add FROM RUNNING CONCURRENTLY ON THE SAME htp. */
10013 /* Try and find the address passed in amongst the leavese on this tree to */
10014 /* be friend. If found then drop the active account for that node drops by */
10015 /* one. If that count reaches 0, it is time to free it all up. */
10016 /* ------------------------------------------------------------------------ */
10018 ipf_ht_node_del(htp, family, addr)
10026 ipf_ht_node_make_key(htp, &k, family, addr);
10028 h = RBI_SEARCH(ipf_rb, &htp->ht_root, &k);
10033 if (h->hn_active == 0) {
10034 (void) RBI_DELETE(ipf_rb, &htp->ht_root, h);
10035 htp->ht_cur_nodes--;
10044 /* ------------------------------------------------------------------------ */
10045 /* Function: ipf_rb_ht_init */
10047 /* Parameters: head(I) - pointer to host tracking structure */
10049 /* Initialise the host tracking structure to be ready for use above. */
10050 /* ------------------------------------------------------------------------ */
10052 ipf_rb_ht_init(head)
10053 host_track_t *head;
10055 RBI_INIT(ipf_rb, &head->ht_root);
10059 /* ------------------------------------------------------------------------ */
10060 /* Function: ipf_rb_ht_freenode */
10062 /* Parameters: head(I) - pointer to host tracking structure */
10063 /* arg(I) - additional argument from walk caller */
10065 /* Free an actual host_node_t structure. */
10066 /* ------------------------------------------------------------------------ */
10068 ipf_rb_ht_freenode(node, arg)
10076 /* ------------------------------------------------------------------------ */
10077 /* Function: ipf_rb_ht_flush */
10079 /* Parameters: head(I) - pointer to host tracking structure */
10081 /* Remove all of the nodes in the tree tracking hosts by calling a walker */
10082 /* and free'ing each one. */
10083 /* ------------------------------------------------------------------------ */
10085 ipf_rb_ht_flush(head)
10086 host_track_t *head;
10088 RBI_WALK(ipf_rb, &head->ht_root, ipf_rb_ht_freenode, NULL);
10092 /* ------------------------------------------------------------------------ */
10093 /* Function: ipf_slowtimer */
10095 /* Parameters: ptr(I) - pointer to main ipf soft context structure */
10097 /* Slowly expire held state for fragments. Timeouts are set * in */
10098 /* expectation of this being called twice per second. */
10099 /* ------------------------------------------------------------------------ */
10101 ipf_slowtimer(softc)
10102 ipf_main_softc_t *softc;
10105 ipf_token_expire(softc);
10106 ipf_frag_expire(softc);
10107 ipf_state_expire(softc);
10108 ipf_nat_expire(softc);
10109 ipf_auth_expire(softc);
10110 ipf_lookup_expire(softc);
10111 ipf_rule_expire(softc);
10112 ipf_sync_expire(softc);
10113 softc->ipf_ticks++;
10114 # if defined(__OpenBSD__)
10115 timeout_add(&ipf_slowtimer_ch, hz/2);
10120 /* ------------------------------------------------------------------------ */
10121 /* Function: ipf_inet_mask_add */
10123 /* Parameters: bits(I) - pointer to nat context information */
10124 /* mtab(I) - pointer to mask hash table structure */
10126 /* When called, bits represents the mask of a new NAT rule that has just */
10127 /* been added. This function inserts a bitmask into the array of masks to */
10128 /* search when searching for a matching NAT rule for a packet. */
10129 /* Prevention of duplicate masks is achieved by checking the use count for */
10130 /* a given netmask. */
10131 /* ------------------------------------------------------------------------ */
10133 ipf_inet_mask_add(bits, mtab)
10135 ipf_v4_masktab_t *mtab;
10140 mtab->imt4_masks[bits]++;
10141 if (mtab->imt4_masks[bits] > 1)
10147 mask = 0xffffffff << (32 - bits);
10149 for (i = 0; i < 33; i++) {
10150 if (ntohl(mtab->imt4_active[i]) < mask) {
10151 for (j = 32; j > i; j--)
10152 mtab->imt4_active[j] = mtab->imt4_active[j - 1];
10153 mtab->imt4_active[i] = htonl(mask);
10161 /* ------------------------------------------------------------------------ */
10162 /* Function: ipf_inet_mask_del */
10164 /* Parameters: bits(I) - number of bits set in the netmask */
10165 /* mtab(I) - pointer to mask hash table structure */
10167 /* Remove the 32bit bitmask represented by "bits" from the collection of */
10168 /* netmasks stored inside of mtab. */
10169 /* ------------------------------------------------------------------------ */
10171 ipf_inet_mask_del(bits, mtab)
10173 ipf_v4_masktab_t *mtab;
10178 mtab->imt4_masks[bits]--;
10179 if (mtab->imt4_masks[bits] > 0)
10182 mask = htonl(0xffffffff << (32 - bits));
10183 for (i = 0; i < 33; i++) {
10184 if (mtab->imt4_active[i] == mask) {
10185 for (j = i + 1; j < 33; j++)
10186 mtab->imt4_active[j - 1] = mtab->imt4_active[j];
10191 ASSERT(mtab->imt4_max >= 0);
10196 /* ------------------------------------------------------------------------ */
10197 /* Function: ipf_inet6_mask_add */
10199 /* Parameters: bits(I) - number of bits set in mask */
10200 /* mask(I) - pointer to mask to add */
10201 /* mtab(I) - pointer to mask hash table structure */
10203 /* When called, bitcount represents the mask of a IPv6 NAT map rule that */
10204 /* has just been added. This function inserts a bitmask into the array of */
10205 /* masks to search when searching for a matching NAT rule for a packet. */
10206 /* Prevention of duplicate masks is achieved by checking the use count for */
10207 /* a given netmask. */
10208 /* ------------------------------------------------------------------------ */
10210 ipf_inet6_mask_add(bits, mask, mtab)
10213 ipf_v6_masktab_t *mtab;
10218 mtab->imt6_masks[bits]++;
10219 if (mtab->imt6_masks[bits] > 1)
10230 for (i = 0; i < 129; i++) {
10231 if (IP6_LT(&mtab->imt6_active[i], mask)) {
10232 for (j = 128; j > i; j--)
10233 mtab->imt6_active[j] = mtab->imt6_active[j - 1];
10234 mtab->imt6_active[i] = *mask;
10242 /* ------------------------------------------------------------------------ */
10243 /* Function: ipf_inet6_mask_del */
10245 /* Parameters: bits(I) - number of bits set in mask */
10246 /* mask(I) - pointer to mask to remove */
10247 /* mtab(I) - pointer to mask hash table structure */
10249 /* Remove the 128bit bitmask represented by "bits" from the collection of */
10250 /* netmasks stored inside of mtab. */
10251 /* ------------------------------------------------------------------------ */
10253 ipf_inet6_mask_del(bits, mask, mtab)
10256 ipf_v6_masktab_t *mtab;
10261 mtab->imt6_masks[bits]--;
10262 if (mtab->imt6_masks[bits] > 0)
10272 for (i = 0; i < 129; i++) {
10273 if (IP6_EQ(&mtab->imt6_active[i], mask)) {
10274 for (j = i + 1; j < 129; j++) {
10275 mtab->imt6_active[j - 1] = mtab->imt6_active[j];
10276 if (IP6_EQ(&mtab->imt6_active[j - 1], &zero))
10283 ASSERT(mtab->imt6_max >= 0);