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1 /*-
2  * SPDX-License-Identifier: BSD-3-Clause
3  *
4  * Copyright (c) 1982, 1986, 1988, 1993
5  *      The Regents of the University of California.
6  * All rights reserved.
7  *
8  * Redistribution and use in source and binary forms, with or without
9  * modification, are permitted provided that the following conditions
10  * are met:
11  * 1. Redistributions of source code must retain the above copyright
12  *    notice, this list of conditions and the following disclaimer.
13  * 2. Redistributions in binary form must reproduce the above copyright
14  *    notice, this list of conditions and the following disclaimer in the
15  *    documentation and/or other materials provided with the distribution.
16  * 3. Neither the name of the University nor the names of its contributors
17  *    may be used to endorse or promote products derived from this software
18  *    without specific prior written permission.
19  *
20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30  * SUCH DAMAGE.
31  *
32  *      @(#)raw_ip.c    8.7 (Berkeley) 5/15/95
33  */
34
35 #include <sys/cdefs.h>
36 __FBSDID("$FreeBSD$");
37
38 #include "opt_inet.h"
39 #include "opt_inet6.h"
40 #include "opt_ipsec.h"
41 #include "opt_route.h"
42
43 #include <sys/param.h>
44 #include <sys/jail.h>
45 #include <sys/kernel.h>
46 #include <sys/eventhandler.h>
47 #include <sys/lock.h>
48 #include <sys/malloc.h>
49 #include <sys/mbuf.h>
50 #include <sys/priv.h>
51 #include <sys/proc.h>
52 #include <sys/protosw.h>
53 #include <sys/rmlock.h>
54 #include <sys/rwlock.h>
55 #include <sys/signalvar.h>
56 #include <sys/socket.h>
57 #include <sys/socketvar.h>
58 #include <sys/sx.h>
59 #include <sys/sysctl.h>
60 #include <sys/systm.h>
61
62 #include <vm/uma.h>
63
64 #include <net/if.h>
65 #include <net/if_var.h>
66 #include <net/route.h>
67 #include <net/route/route_ctl.h>
68 #include <net/vnet.h>
69
70 #include <netinet/in.h>
71 #include <netinet/in_systm.h>
72 #include <netinet/in_fib.h>
73 #include <netinet/in_pcb.h>
74 #include <netinet/in_var.h>
75 #include <netinet/if_ether.h>
76 #include <netinet/ip.h>
77 #include <netinet/ip_var.h>
78 #include <netinet/ip_mroute.h>
79 #include <netinet/ip_icmp.h>
80
81 #include <netipsec/ipsec_support.h>
82
83 #include <machine/stdarg.h>
84 #include <security/mac/mac_framework.h>
85
86 VNET_DEFINE(int, ip_defttl) = IPDEFTTL;
87 SYSCTL_INT(_net_inet_ip, IPCTL_DEFTTL, ttl, CTLFLAG_VNET | CTLFLAG_RW,
88     &VNET_NAME(ip_defttl), 0,
89     "Maximum TTL on IP packets");
90
91 VNET_DEFINE(struct inpcbhead, ripcb);
92 VNET_DEFINE(struct inpcbinfo, ripcbinfo);
93
94 #define V_ripcb                 VNET(ripcb)
95 #define V_ripcbinfo             VNET(ripcbinfo)
96
97 /*
98  * Control and data hooks for ipfw, dummynet, divert and so on.
99  * The data hooks are not used here but it is convenient
100  * to keep them all in one place.
101  */
102 VNET_DEFINE(ip_fw_chk_ptr_t, ip_fw_chk_ptr) = NULL;
103 VNET_DEFINE(ip_fw_ctl_ptr_t, ip_fw_ctl_ptr) = NULL;
104
105 int     (*ip_dn_ctl_ptr)(struct sockopt *);
106 int     (*ip_dn_io_ptr)(struct mbuf **, struct ip_fw_args *);
107 void    (*ip_divert_ptr)(struct mbuf *, bool);
108 int     (*ng_ipfw_input_p)(struct mbuf **, struct ip_fw_args *, bool);
109
110 #ifdef INET
111 /*
112  * Hooks for multicast routing. They all default to NULL, so leave them not
113  * initialized and rely on BSS being set to 0.
114  */
115
116 /*
117  * The socket used to communicate with the multicast routing daemon.
118  */
119 VNET_DEFINE(struct socket *, ip_mrouter);
120
121 /*
122  * The various mrouter and rsvp functions.
123  */
124 int (*ip_mrouter_set)(struct socket *, struct sockopt *);
125 int (*ip_mrouter_get)(struct socket *, struct sockopt *);
126 int (*ip_mrouter_done)(void);
127 int (*ip_mforward)(struct ip *, struct ifnet *, struct mbuf *,
128                    struct ip_moptions *);
129 int (*mrt_ioctl)(u_long, caddr_t, int);
130 int (*legal_vif_num)(int);
131 u_long (*ip_mcast_src)(int);
132
133 int (*rsvp_input_p)(struct mbuf **, int *, int);
134 int (*ip_rsvp_vif)(struct socket *, struct sockopt *);
135 void (*ip_rsvp_force_done)(struct socket *);
136 #endif /* INET */
137
138 extern  struct protosw inetsw[];
139
140 u_long  rip_sendspace = 9216;
141 SYSCTL_ULONG(_net_inet_raw, OID_AUTO, maxdgram, CTLFLAG_RW,
142     &rip_sendspace, 0, "Maximum outgoing raw IP datagram size");
143
144 u_long  rip_recvspace = 9216;
145 SYSCTL_ULONG(_net_inet_raw, OID_AUTO, recvspace, CTLFLAG_RW,
146     &rip_recvspace, 0, "Maximum space for incoming raw IP datagrams");
147
148 /*
149  * Hash functions
150  */
151
152 #define INP_PCBHASH_RAW_SIZE    256
153 #define INP_PCBHASH_RAW(proto, laddr, faddr, mask) \
154         (((proto) + (laddr) + (faddr)) % (mask) + 1)
155
156 #ifdef INET
157 static void
158 rip_inshash(struct inpcb *inp)
159 {
160         struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
161         struct inpcbhead *pcbhash;
162         int hash;
163
164         INP_INFO_WLOCK_ASSERT(pcbinfo);
165         INP_WLOCK_ASSERT(inp);
166
167         if (inp->inp_ip_p != 0 &&
168             inp->inp_laddr.s_addr != INADDR_ANY &&
169             inp->inp_faddr.s_addr != INADDR_ANY) {
170                 hash = INP_PCBHASH_RAW(inp->inp_ip_p, inp->inp_laddr.s_addr,
171                     inp->inp_faddr.s_addr, pcbinfo->ipi_hashmask);
172         } else
173                 hash = 0;
174         pcbhash = &pcbinfo->ipi_hashbase[hash];
175         CK_LIST_INSERT_HEAD(pcbhash, inp, inp_hash);
176 }
177
178 static void
179 rip_delhash(struct inpcb *inp)
180 {
181
182         INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo);
183         INP_WLOCK_ASSERT(inp);
184
185         CK_LIST_REMOVE(inp, inp_hash);
186 }
187 #endif /* INET */
188
189 /*
190  * Raw interface to IP protocol.
191  */
192
193 /*
194  * Initialize raw connection block q.
195  */
196 static void
197 rip_zone_change(void *tag)
198 {
199
200         uma_zone_set_max(V_ripcbinfo.ipi_zone, maxsockets);
201 }
202
203 static int
204 rip_inpcb_init(void *mem, int size, int flags)
205 {
206         struct inpcb *inp = mem;
207
208         INP_LOCK_INIT(inp, "inp", "rawinp");
209         return (0);
210 }
211
212 void
213 rip_init(void)
214 {
215
216         in_pcbinfo_init(&V_ripcbinfo, "rip", &V_ripcb, INP_PCBHASH_RAW_SIZE,
217             1, "ripcb", rip_inpcb_init, IPI_HASHFIELDS_NONE);
218         EVENTHANDLER_REGISTER(maxsockets_change, rip_zone_change, NULL,
219             EVENTHANDLER_PRI_ANY);
220 }
221
222 #ifdef VIMAGE
223 static void
224 rip_destroy(void *unused __unused)
225 {
226
227         in_pcbinfo_destroy(&V_ripcbinfo);
228 }
229 VNET_SYSUNINIT(raw_ip, SI_SUB_PROTO_DOMAIN, SI_ORDER_FOURTH, rip_destroy, NULL);
230 #endif
231
232 #ifdef INET
233 static int
234 rip_append(struct inpcb *last, struct ip *ip, struct mbuf *n,
235     struct sockaddr_in *ripsrc)
236 {
237         int policyfail = 0;
238
239         INP_LOCK_ASSERT(last);
240
241 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
242         /* check AH/ESP integrity. */
243         if (IPSEC_ENABLED(ipv4)) {
244                 if (IPSEC_CHECK_POLICY(ipv4, n, last) != 0)
245                         policyfail = 1;
246         }
247 #endif /* IPSEC */
248 #ifdef MAC
249         if (!policyfail && mac_inpcb_check_deliver(last, n) != 0)
250                 policyfail = 1;
251 #endif
252         /* Check the minimum TTL for socket. */
253         if (last->inp_ip_minttl && last->inp_ip_minttl > ip->ip_ttl)
254                 policyfail = 1;
255         if (!policyfail) {
256                 struct mbuf *opts = NULL;
257                 struct socket *so;
258
259                 so = last->inp_socket;
260                 if ((last->inp_flags & INP_CONTROLOPTS) ||
261                     (so->so_options & (SO_TIMESTAMP | SO_BINTIME)))
262                         ip_savecontrol(last, &opts, ip, n);
263                 SOCKBUF_LOCK(&so->so_rcv);
264                 if (sbappendaddr_locked(&so->so_rcv,
265                     (struct sockaddr *)ripsrc, n, opts) == 0) {
266                         /* should notify about lost packet */
267                         m_freem(n);
268                         if (opts)
269                                 m_freem(opts);
270                         SOCKBUF_UNLOCK(&so->so_rcv);
271                 } else
272                         sorwakeup_locked(so);
273         } else
274                 m_freem(n);
275         return (policyfail);
276 }
277
278 /*
279  * Setup generic address and protocol structures for raw_input routine, then
280  * pass them along with mbuf chain.
281  */
282 int
283 rip_input(struct mbuf **mp, int *offp, int proto)
284 {
285         struct ifnet *ifp;
286         struct mbuf *m = *mp;
287         struct ip *ip = mtod(m, struct ip *);
288         struct inpcb *inp, *last;
289         struct sockaddr_in ripsrc;
290         int hash;
291
292         NET_EPOCH_ASSERT();
293
294         *mp = NULL;
295
296         bzero(&ripsrc, sizeof(ripsrc));
297         ripsrc.sin_len = sizeof(ripsrc);
298         ripsrc.sin_family = AF_INET;
299         ripsrc.sin_addr = ip->ip_src;
300         last = NULL;
301
302         ifp = m->m_pkthdr.rcvif;
303
304         hash = INP_PCBHASH_RAW(proto, ip->ip_src.s_addr,
305             ip->ip_dst.s_addr, V_ripcbinfo.ipi_hashmask);
306         CK_LIST_FOREACH(inp, &V_ripcbinfo.ipi_hashbase[hash], inp_hash) {
307                 if (inp->inp_ip_p != proto)
308                         continue;
309 #ifdef INET6
310                 /* XXX inp locking */
311                 if ((inp->inp_vflag & INP_IPV4) == 0)
312                         continue;
313 #endif
314                 if (inp->inp_laddr.s_addr != ip->ip_dst.s_addr)
315                         continue;
316                 if (inp->inp_faddr.s_addr != ip->ip_src.s_addr)
317                         continue;
318                 if (last != NULL) {
319                         struct mbuf *n;
320
321                         n = m_copym(m, 0, M_COPYALL, M_NOWAIT);
322                         if (n != NULL)
323                             (void) rip_append(last, ip, n, &ripsrc);
324                         /* XXX count dropped packet */
325                         INP_RUNLOCK(last);
326                         last = NULL;
327                 }
328                 INP_RLOCK(inp);
329                 if (__predict_false(inp->inp_flags2 & INP_FREED))
330                         goto skip_1;
331                 if (jailed_without_vnet(inp->inp_cred)) {
332                         /*
333                          * XXX: If faddr was bound to multicast group,
334                          * jailed raw socket will drop datagram.
335                          */
336                         if (prison_check_ip4(inp->inp_cred, &ip->ip_dst) != 0)
337                                 goto skip_1;
338                 }
339                 last = inp;
340                 continue;
341         skip_1:
342                 INP_RUNLOCK(inp);
343         }
344         CK_LIST_FOREACH(inp, &V_ripcbinfo.ipi_hashbase[0], inp_hash) {
345                 if (inp->inp_ip_p && inp->inp_ip_p != proto)
346                         continue;
347 #ifdef INET6
348                 /* XXX inp locking */
349                 if ((inp->inp_vflag & INP_IPV4) == 0)
350                         continue;
351 #endif
352                 if (!in_nullhost(inp->inp_laddr) &&
353                     !in_hosteq(inp->inp_laddr, ip->ip_dst))
354                         continue;
355                 if (!in_nullhost(inp->inp_faddr) &&
356                     !in_hosteq(inp->inp_faddr, ip->ip_src))
357                         continue;
358                 if (last != NULL) {
359                         struct mbuf *n;
360
361                         n = m_copym(m, 0, M_COPYALL, M_NOWAIT);
362                         if (n != NULL)
363                                 (void) rip_append(last, ip, n, &ripsrc);
364                         /* XXX count dropped packet */
365                         INP_RUNLOCK(last);
366                         last = NULL;
367                 }
368                 INP_RLOCK(inp);
369                 if (__predict_false(inp->inp_flags2 & INP_FREED))
370                         goto skip_2;
371                 if (jailed_without_vnet(inp->inp_cred)) {
372                         /*
373                          * Allow raw socket in jail to receive multicast;
374                          * assume process had PRIV_NETINET_RAW at attach,
375                          * and fall through into normal filter path if so.
376                          */
377                         if (!IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) &&
378                             prison_check_ip4(inp->inp_cred, &ip->ip_dst) != 0)
379                                 goto skip_2;
380                 }
381                 /*
382                  * If this raw socket has multicast state, and we
383                  * have received a multicast, check if this socket
384                  * should receive it, as multicast filtering is now
385                  * the responsibility of the transport layer.
386                  */
387                 if (inp->inp_moptions != NULL &&
388                     IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) {
389                         /*
390                          * If the incoming datagram is for IGMP, allow it
391                          * through unconditionally to the raw socket.
392                          *
393                          * In the case of IGMPv2, we may not have explicitly
394                          * joined the group, and may have set IFF_ALLMULTI
395                          * on the interface. imo_multi_filter() may discard
396                          * control traffic we actually need to see.
397                          *
398                          * Userland multicast routing daemons should continue
399                          * filter the control traffic appropriately.
400                          */
401                         int blocked;
402
403                         blocked = MCAST_PASS;
404                         if (proto != IPPROTO_IGMP) {
405                                 struct sockaddr_in group;
406
407                                 bzero(&group, sizeof(struct sockaddr_in));
408                                 group.sin_len = sizeof(struct sockaddr_in);
409                                 group.sin_family = AF_INET;
410                                 group.sin_addr = ip->ip_dst;
411
412                                 blocked = imo_multi_filter(inp->inp_moptions,
413                                     ifp,
414                                     (struct sockaddr *)&group,
415                                     (struct sockaddr *)&ripsrc);
416                         }
417
418                         if (blocked != MCAST_PASS) {
419                                 IPSTAT_INC(ips_notmember);
420                                 goto skip_2;
421                         }
422                 }
423                 last = inp;
424                 continue;
425         skip_2:
426                 INP_RUNLOCK(inp);
427         }
428         if (last != NULL) {
429                 if (rip_append(last, ip, m, &ripsrc) != 0)
430                         IPSTAT_INC(ips_delivered);
431                 INP_RUNLOCK(last);
432         } else {
433                 if (inetsw[ip_protox[ip->ip_p]].pr_input == rip_input) {
434                         IPSTAT_INC(ips_noproto);
435                         IPSTAT_DEC(ips_delivered);
436                         icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PROTOCOL, 0, 0);
437                 } else {
438                         m_freem(m);
439                 }
440         }
441         return (IPPROTO_DONE);
442 }
443
444 /*
445  * Generate IP header and pass packet to ip_output.  Tack on options user may
446  * have setup with control call.
447  */
448 int
449 rip_output(struct mbuf *m, struct socket *so, ...)
450 {
451         struct epoch_tracker et;
452         struct ip *ip;
453         int error;
454         struct inpcb *inp = sotoinpcb(so);
455         va_list ap;
456         u_long dst;
457         int flags = ((so->so_options & SO_DONTROUTE) ? IP_ROUTETOIF : 0) |
458             IP_ALLOWBROADCAST;
459         int cnt, hlen;
460         u_char opttype, optlen, *cp;
461
462         va_start(ap, so);
463         dst = va_arg(ap, u_long);
464         va_end(ap);
465
466         /*
467          * If the user handed us a complete IP packet, use it.  Otherwise,
468          * allocate an mbuf for a header and fill it in.
469          */
470         if ((inp->inp_flags & INP_HDRINCL) == 0) {
471                 if (m->m_pkthdr.len + sizeof(struct ip) > IP_MAXPACKET) {
472                         m_freem(m);
473                         return(EMSGSIZE);
474                 }
475                 M_PREPEND(m, sizeof(struct ip), M_NOWAIT);
476                 if (m == NULL)
477                         return(ENOBUFS);
478
479                 INP_RLOCK(inp);
480                 ip = mtod(m, struct ip *);
481                 ip->ip_tos = inp->inp_ip_tos;
482                 if (inp->inp_flags & INP_DONTFRAG)
483                         ip->ip_off = htons(IP_DF);
484                 else
485                         ip->ip_off = htons(0);
486                 ip->ip_p = inp->inp_ip_p;
487                 ip->ip_len = htons(m->m_pkthdr.len);
488                 ip->ip_src = inp->inp_laddr;
489                 ip->ip_dst.s_addr = dst;
490 #ifdef ROUTE_MPATH
491                 if (CALC_FLOWID_OUTBOUND) {
492                         uint32_t hash_type, hash_val;
493
494                         hash_val = fib4_calc_software_hash(ip->ip_src,
495                             ip->ip_dst, 0, 0, ip->ip_p, &hash_type);
496                         m->m_pkthdr.flowid = hash_val;
497                         M_HASHTYPE_SET(m, hash_type);
498                         flags |= IP_NODEFAULTFLOWID;
499                 }
500 #endif
501                 if (jailed(inp->inp_cred)) {
502                         /*
503                          * prison_local_ip4() would be good enough but would
504                          * let a source of INADDR_ANY pass, which we do not
505                          * want to see from jails.
506                          */
507                         if (ip->ip_src.s_addr == INADDR_ANY) {
508                                 NET_EPOCH_ENTER(et);
509                                 error = in_pcbladdr(inp, &ip->ip_dst,
510                                     &ip->ip_src, inp->inp_cred);
511                                 NET_EPOCH_EXIT(et);
512                         } else {
513                                 error = prison_local_ip4(inp->inp_cred,
514                                     &ip->ip_src);
515                         }
516                         if (error != 0) {
517                                 INP_RUNLOCK(inp);
518                                 m_freem(m);
519                                 return (error);
520                         }
521                 }
522                 ip->ip_ttl = inp->inp_ip_ttl;
523         } else {
524                 if (m->m_pkthdr.len > IP_MAXPACKET) {
525                         m_freem(m);
526                         return(EMSGSIZE);
527                 }
528                 ip = mtod(m, struct ip *);
529                 hlen = ip->ip_hl << 2;
530                 if (m->m_len < hlen) {
531                         m = m_pullup(m, hlen);
532                         if (m == NULL)
533                                 return (EINVAL);
534                         ip = mtod(m, struct ip *);
535                 }
536 #ifdef ROUTE_MPATH
537                 if (CALC_FLOWID_OUTBOUND) {
538                         uint32_t hash_type, hash_val;
539
540                         hash_val = fib4_calc_software_hash(ip->ip_dst,
541                             ip->ip_src, 0, 0, ip->ip_p, &hash_type);
542                         m->m_pkthdr.flowid = hash_val;
543                         M_HASHTYPE_SET(m, hash_type);
544                         flags |= IP_NODEFAULTFLOWID;
545                 }
546 #endif
547                 INP_RLOCK(inp);
548                 /*
549                  * Don't allow both user specified and setsockopt options,
550                  * and don't allow packet length sizes that will crash.
551                  */
552                 if ((hlen < sizeof (*ip))
553                     || ((hlen > sizeof (*ip)) && inp->inp_options)
554                     || (ntohs(ip->ip_len) != m->m_pkthdr.len)) {
555                         INP_RUNLOCK(inp);
556                         m_freem(m);
557                         return (EINVAL);
558                 }
559                 error = prison_check_ip4(inp->inp_cred, &ip->ip_src);
560                 if (error != 0) {
561                         INP_RUNLOCK(inp);
562                         m_freem(m);
563                         return (error);
564                 }
565                 /*
566                  * Don't allow IP options which do not have the required
567                  * structure as specified in section 3.1 of RFC 791 on
568                  * pages 15-23.
569                  */
570                 cp = (u_char *)(ip + 1);
571                 cnt = hlen - sizeof (struct ip);
572                 for (; cnt > 0; cnt -= optlen, cp += optlen) {
573                         opttype = cp[IPOPT_OPTVAL];
574                         if (opttype == IPOPT_EOL)
575                                 break;
576                         if (opttype == IPOPT_NOP) {
577                                 optlen = 1;
578                                 continue;
579                         }
580                         if (cnt < IPOPT_OLEN + sizeof(u_char)) {
581                                 INP_RUNLOCK(inp);
582                                 m_freem(m);
583                                 return (EINVAL);
584                         }
585                         optlen = cp[IPOPT_OLEN];
586                         if (optlen < IPOPT_OLEN + sizeof(u_char) ||
587                             optlen > cnt) {
588                                 INP_RUNLOCK(inp);
589                                 m_freem(m);
590                                 return (EINVAL);
591                         }
592                 }
593                 /*
594                  * This doesn't allow application to specify ID of zero,
595                  * but we got this limitation from the beginning of history.
596                  */
597                 if (ip->ip_id == 0)
598                         ip_fillid(ip);
599
600                 /*
601                  * XXX prevent ip_output from overwriting header fields.
602                  */
603                 flags |= IP_RAWOUTPUT;
604                 IPSTAT_INC(ips_rawout);
605         }
606
607         if (inp->inp_flags & INP_ONESBCAST)
608                 flags |= IP_SENDONES;
609
610 #ifdef MAC
611         mac_inpcb_create_mbuf(inp, m);
612 #endif
613
614         NET_EPOCH_ENTER(et);
615         error = ip_output(m, inp->inp_options, NULL, flags,
616             inp->inp_moptions, inp);
617         NET_EPOCH_EXIT(et);
618         INP_RUNLOCK(inp);
619         return (error);
620 }
621
622 /*
623  * Raw IP socket option processing.
624  *
625  * IMPORTANT NOTE regarding access control: Traditionally, raw sockets could
626  * only be created by a privileged process, and as such, socket option
627  * operations to manage system properties on any raw socket were allowed to
628  * take place without explicit additional access control checks.  However,
629  * raw sockets can now also be created in jail(), and therefore explicit
630  * checks are now required.  Likewise, raw sockets can be used by a process
631  * after it gives up privilege, so some caution is required.  For options
632  * passed down to the IP layer via ip_ctloutput(), checks are assumed to be
633  * performed in ip_ctloutput() and therefore no check occurs here.
634  * Unilaterally checking priv_check() here breaks normal IP socket option
635  * operations on raw sockets.
636  *
637  * When adding new socket options here, make sure to add access control
638  * checks here as necessary.
639  *
640  * XXX-BZ inp locking?
641  */
642 int
643 rip_ctloutput(struct socket *so, struct sockopt *sopt)
644 {
645         struct  inpcb *inp = sotoinpcb(so);
646         int     error, optval;
647
648         if (sopt->sopt_level != IPPROTO_IP) {
649                 if ((sopt->sopt_level == SOL_SOCKET) &&
650                     (sopt->sopt_name == SO_SETFIB)) {
651                         inp->inp_inc.inc_fibnum = so->so_fibnum;
652                         return (0);
653                 }
654                 return (EINVAL);
655         }
656
657         error = 0;
658         switch (sopt->sopt_dir) {
659         case SOPT_GET:
660                 switch (sopt->sopt_name) {
661                 case IP_HDRINCL:
662                         optval = inp->inp_flags & INP_HDRINCL;
663                         error = sooptcopyout(sopt, &optval, sizeof optval);
664                         break;
665
666                 case IP_FW3:    /* generic ipfw v.3 functions */
667                 case IP_FW_ADD: /* ADD actually returns the body... */
668                 case IP_FW_GET:
669                 case IP_FW_TABLE_GETSIZE:
670                 case IP_FW_TABLE_LIST:
671                 case IP_FW_NAT_GET_CONFIG:
672                 case IP_FW_NAT_GET_LOG:
673                         if (V_ip_fw_ctl_ptr != NULL)
674                                 error = V_ip_fw_ctl_ptr(sopt);
675                         else
676                                 error = ENOPROTOOPT;
677                         break;
678
679                 case IP_DUMMYNET3:      /* generic dummynet v.3 functions */
680                 case IP_DUMMYNET_GET:
681                         if (ip_dn_ctl_ptr != NULL)
682                                 error = ip_dn_ctl_ptr(sopt);
683                         else
684                                 error = ENOPROTOOPT;
685                         break ;
686
687                 case MRT_INIT:
688                 case MRT_DONE:
689                 case MRT_ADD_VIF:
690                 case MRT_DEL_VIF:
691                 case MRT_ADD_MFC:
692                 case MRT_DEL_MFC:
693                 case MRT_VERSION:
694                 case MRT_ASSERT:
695                 case MRT_API_SUPPORT:
696                 case MRT_API_CONFIG:
697                 case MRT_ADD_BW_UPCALL:
698                 case MRT_DEL_BW_UPCALL:
699                         error = priv_check(curthread, PRIV_NETINET_MROUTE);
700                         if (error != 0)
701                                 return (error);
702                         error = ip_mrouter_get ? ip_mrouter_get(so, sopt) :
703                                 EOPNOTSUPP;
704                         break;
705
706                 default:
707                         error = ip_ctloutput(so, sopt);
708                         break;
709                 }
710                 break;
711
712         case SOPT_SET:
713                 switch (sopt->sopt_name) {
714                 case IP_HDRINCL:
715                         error = sooptcopyin(sopt, &optval, sizeof optval,
716                                             sizeof optval);
717                         if (error)
718                                 break;
719                         if (optval)
720                                 inp->inp_flags |= INP_HDRINCL;
721                         else
722                                 inp->inp_flags &= ~INP_HDRINCL;
723                         break;
724
725                 case IP_FW3:    /* generic ipfw v.3 functions */
726                 case IP_FW_ADD:
727                 case IP_FW_DEL:
728                 case IP_FW_FLUSH:
729                 case IP_FW_ZERO:
730                 case IP_FW_RESETLOG:
731                 case IP_FW_TABLE_ADD:
732                 case IP_FW_TABLE_DEL:
733                 case IP_FW_TABLE_FLUSH:
734                 case IP_FW_NAT_CFG:
735                 case IP_FW_NAT_DEL:
736                         if (V_ip_fw_ctl_ptr != NULL)
737                                 error = V_ip_fw_ctl_ptr(sopt);
738                         else
739                                 error = ENOPROTOOPT;
740                         break;
741
742                 case IP_DUMMYNET3:      /* generic dummynet v.3 functions */
743                 case IP_DUMMYNET_CONFIGURE:
744                 case IP_DUMMYNET_DEL:
745                 case IP_DUMMYNET_FLUSH:
746                         if (ip_dn_ctl_ptr != NULL)
747                                 error = ip_dn_ctl_ptr(sopt);
748                         else
749                                 error = ENOPROTOOPT ;
750                         break ;
751
752                 case IP_RSVP_ON:
753                         error = priv_check(curthread, PRIV_NETINET_MROUTE);
754                         if (error != 0)
755                                 return (error);
756                         error = ip_rsvp_init(so);
757                         break;
758
759                 case IP_RSVP_OFF:
760                         error = priv_check(curthread, PRIV_NETINET_MROUTE);
761                         if (error != 0)
762                                 return (error);
763                         error = ip_rsvp_done();
764                         break;
765
766                 case IP_RSVP_VIF_ON:
767                 case IP_RSVP_VIF_OFF:
768                         error = priv_check(curthread, PRIV_NETINET_MROUTE);
769                         if (error != 0)
770                                 return (error);
771                         error = ip_rsvp_vif ?
772                                 ip_rsvp_vif(so, sopt) : EINVAL;
773                         break;
774
775                 case MRT_INIT:
776                 case MRT_DONE:
777                 case MRT_ADD_VIF:
778                 case MRT_DEL_VIF:
779                 case MRT_ADD_MFC:
780                 case MRT_DEL_MFC:
781                 case MRT_VERSION:
782                 case MRT_ASSERT:
783                 case MRT_API_SUPPORT:
784                 case MRT_API_CONFIG:
785                 case MRT_ADD_BW_UPCALL:
786                 case MRT_DEL_BW_UPCALL:
787                         error = priv_check(curthread, PRIV_NETINET_MROUTE);
788                         if (error != 0)
789                                 return (error);
790                         error = ip_mrouter_set ? ip_mrouter_set(so, sopt) :
791                                         EOPNOTSUPP;
792                         break;
793
794                 default:
795                         error = ip_ctloutput(so, sopt);
796                         break;
797                 }
798                 break;
799         }
800
801         return (error);
802 }
803
804 /*
805  * This function exists solely to receive the PRC_IFDOWN messages which are
806  * sent by if_down().  It looks for an ifaddr whose ifa_addr is sa, and calls
807  * in_ifadown() to remove all routes corresponding to that address.  It also
808  * receives the PRC_IFUP messages from if_up() and reinstalls the interface
809  * routes.
810  */
811 void
812 rip_ctlinput(int cmd, struct sockaddr *sa, void *vip)
813 {
814         struct rm_priotracker in_ifa_tracker;
815         struct in_ifaddr *ia;
816         struct ifnet *ifp;
817         int err;
818         int flags;
819
820         switch (cmd) {
821         case PRC_IFDOWN:
822                 IN_IFADDR_RLOCK(&in_ifa_tracker);
823                 CK_STAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) {
824                         if (ia->ia_ifa.ifa_addr == sa
825                             && (ia->ia_flags & IFA_ROUTE)) {
826                                 ifa_ref(&ia->ia_ifa);
827                                 IN_IFADDR_RUNLOCK(&in_ifa_tracker);
828                                 /*
829                                  * in_scrubprefix() kills the interface route.
830                                  */
831                                 in_scrubprefix(ia, 0);
832                                 /*
833                                  * in_ifadown gets rid of all the rest of the
834                                  * routes.  This is not quite the right thing
835                                  * to do, but at least if we are running a
836                                  * routing process they will come back.
837                                  */
838                                 in_ifadown(&ia->ia_ifa, 0);
839                                 ifa_free(&ia->ia_ifa);
840                                 break;
841                         }
842                 }
843                 if (ia == NULL)         /* If ia matched, already unlocked. */
844                         IN_IFADDR_RUNLOCK(&in_ifa_tracker);
845                 break;
846
847         case PRC_IFUP:
848                 IN_IFADDR_RLOCK(&in_ifa_tracker);
849                 CK_STAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) {
850                         if (ia->ia_ifa.ifa_addr == sa)
851                                 break;
852                 }
853                 if (ia == NULL || (ia->ia_flags & IFA_ROUTE)) {
854                         IN_IFADDR_RUNLOCK(&in_ifa_tracker);
855                         return;
856                 }
857                 ifa_ref(&ia->ia_ifa);
858                 IN_IFADDR_RUNLOCK(&in_ifa_tracker);
859                 flags = RTF_UP;
860                 ifp = ia->ia_ifa.ifa_ifp;
861
862                 if ((ifp->if_flags & IFF_LOOPBACK)
863                     || (ifp->if_flags & IFF_POINTOPOINT))
864                         flags |= RTF_HOST;
865
866                 err = ifa_del_loopback_route((struct ifaddr *)ia, sa);
867
868                 rt_addrmsg(RTM_ADD, &ia->ia_ifa, ia->ia_ifp->if_fib);
869                 err = in_handle_ifaddr_route(RTM_ADD, ia);
870                 if (err == 0)
871                         ia->ia_flags |= IFA_ROUTE;
872
873                 err = ifa_add_loopback_route((struct ifaddr *)ia, sa);
874
875                 ifa_free(&ia->ia_ifa);
876                 break;
877         }
878 }
879
880 static int
881 rip_attach(struct socket *so, int proto, struct thread *td)
882 {
883         struct inpcb *inp;
884         int error;
885
886         inp = sotoinpcb(so);
887         KASSERT(inp == NULL, ("rip_attach: inp != NULL"));
888
889         error = priv_check(td, PRIV_NETINET_RAW);
890         if (error)
891                 return (error);
892         if (proto >= IPPROTO_MAX || proto < 0)
893                 return EPROTONOSUPPORT;
894         error = soreserve(so, rip_sendspace, rip_recvspace);
895         if (error)
896                 return (error);
897         INP_INFO_WLOCK(&V_ripcbinfo);
898         error = in_pcballoc(so, &V_ripcbinfo);
899         if (error) {
900                 INP_INFO_WUNLOCK(&V_ripcbinfo);
901                 return (error);
902         }
903         inp = (struct inpcb *)so->so_pcb;
904         inp->inp_vflag |= INP_IPV4;
905         inp->inp_ip_p = proto;
906         inp->inp_ip_ttl = V_ip_defttl;
907         rip_inshash(inp);
908         INP_INFO_WUNLOCK(&V_ripcbinfo);
909         INP_WUNLOCK(inp);
910         return (0);
911 }
912
913 static void
914 rip_detach(struct socket *so)
915 {
916         struct inpcb *inp;
917
918         inp = sotoinpcb(so);
919         KASSERT(inp != NULL, ("rip_detach: inp == NULL"));
920         KASSERT(inp->inp_faddr.s_addr == INADDR_ANY,
921             ("rip_detach: not closed"));
922
923         INP_INFO_WLOCK(&V_ripcbinfo);
924         INP_WLOCK(inp);
925         rip_delhash(inp);
926         if (so == V_ip_mrouter && ip_mrouter_done)
927                 ip_mrouter_done();
928         if (ip_rsvp_force_done)
929                 ip_rsvp_force_done(so);
930         if (so == V_ip_rsvpd)
931                 ip_rsvp_done();
932         in_pcbdetach(inp);
933         in_pcbfree(inp);
934         INP_INFO_WUNLOCK(&V_ripcbinfo);
935 }
936
937 static void
938 rip_dodisconnect(struct socket *so, struct inpcb *inp)
939 {
940         struct inpcbinfo *pcbinfo;
941
942         pcbinfo = inp->inp_pcbinfo;
943         INP_INFO_WLOCK(pcbinfo);
944         INP_WLOCK(inp);
945         rip_delhash(inp);
946         inp->inp_faddr.s_addr = INADDR_ANY;
947         rip_inshash(inp);
948         SOCK_LOCK(so);
949         so->so_state &= ~SS_ISCONNECTED;
950         SOCK_UNLOCK(so);
951         INP_WUNLOCK(inp);
952         INP_INFO_WUNLOCK(pcbinfo);
953 }
954
955 static void
956 rip_abort(struct socket *so)
957 {
958         struct inpcb *inp;
959
960         inp = sotoinpcb(so);
961         KASSERT(inp != NULL, ("rip_abort: inp == NULL"));
962
963         rip_dodisconnect(so, inp);
964 }
965
966 static void
967 rip_close(struct socket *so)
968 {
969         struct inpcb *inp;
970
971         inp = sotoinpcb(so);
972         KASSERT(inp != NULL, ("rip_close: inp == NULL"));
973
974         rip_dodisconnect(so, inp);
975 }
976
977 static int
978 rip_disconnect(struct socket *so)
979 {
980         struct inpcb *inp;
981
982         if ((so->so_state & SS_ISCONNECTED) == 0)
983                 return (ENOTCONN);
984
985         inp = sotoinpcb(so);
986         KASSERT(inp != NULL, ("rip_disconnect: inp == NULL"));
987
988         rip_dodisconnect(so, inp);
989         return (0);
990 }
991
992 static int
993 rip_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
994 {
995         struct sockaddr_in *addr = (struct sockaddr_in *)nam;
996         struct inpcb *inp;
997         int error;
998
999         if (nam->sa_len != sizeof(*addr))
1000                 return (EINVAL);
1001
1002         error = prison_check_ip4(td->td_ucred, &addr->sin_addr);
1003         if (error != 0)
1004                 return (error);
1005
1006         inp = sotoinpcb(so);
1007         KASSERT(inp != NULL, ("rip_bind: inp == NULL"));
1008
1009         if (CK_STAILQ_EMPTY(&V_ifnet) ||
1010             (addr->sin_family != AF_INET && addr->sin_family != AF_IMPLINK) ||
1011             (addr->sin_addr.s_addr &&
1012              (inp->inp_flags & INP_BINDANY) == 0 &&
1013              ifa_ifwithaddr_check((struct sockaddr *)addr) == 0))
1014                 return (EADDRNOTAVAIL);
1015
1016         INP_INFO_WLOCK(&V_ripcbinfo);
1017         INP_WLOCK(inp);
1018         rip_delhash(inp);
1019         inp->inp_laddr = addr->sin_addr;
1020         rip_inshash(inp);
1021         INP_WUNLOCK(inp);
1022         INP_INFO_WUNLOCK(&V_ripcbinfo);
1023         return (0);
1024 }
1025
1026 static int
1027 rip_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
1028 {
1029         struct sockaddr_in *addr = (struct sockaddr_in *)nam;
1030         struct inpcb *inp;
1031
1032         if (nam->sa_len != sizeof(*addr))
1033                 return (EINVAL);
1034         if (CK_STAILQ_EMPTY(&V_ifnet))
1035                 return (EADDRNOTAVAIL);
1036         if (addr->sin_family != AF_INET && addr->sin_family != AF_IMPLINK)
1037                 return (EAFNOSUPPORT);
1038
1039         inp = sotoinpcb(so);
1040         KASSERT(inp != NULL, ("rip_connect: inp == NULL"));
1041
1042         INP_INFO_WLOCK(&V_ripcbinfo);
1043         INP_WLOCK(inp);
1044         rip_delhash(inp);
1045         inp->inp_faddr = addr->sin_addr;
1046         rip_inshash(inp);
1047         soisconnected(so);
1048         INP_WUNLOCK(inp);
1049         INP_INFO_WUNLOCK(&V_ripcbinfo);
1050         return (0);
1051 }
1052
1053 static int
1054 rip_shutdown(struct socket *so)
1055 {
1056         struct inpcb *inp;
1057
1058         inp = sotoinpcb(so);
1059         KASSERT(inp != NULL, ("rip_shutdown: inp == NULL"));
1060
1061         INP_WLOCK(inp);
1062         socantsendmore(so);
1063         INP_WUNLOCK(inp);
1064         return (0);
1065 }
1066
1067 static int
1068 rip_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
1069     struct mbuf *control, struct thread *td)
1070 {
1071         struct inpcb *inp;
1072         u_long dst;
1073
1074         inp = sotoinpcb(so);
1075         KASSERT(inp != NULL, ("rip_send: inp == NULL"));
1076
1077         /*
1078          * Note: 'dst' reads below are unlocked.
1079          */
1080         if (so->so_state & SS_ISCONNECTED) {
1081                 if (nam) {
1082                         m_freem(m);
1083                         return (EISCONN);
1084                 }
1085                 dst = inp->inp_faddr.s_addr;    /* Unlocked read. */
1086         } else {
1087                 if (nam == NULL) {
1088                         m_freem(m);
1089                         return (ENOTCONN);
1090                 }
1091                 dst = ((struct sockaddr_in *)nam)->sin_addr.s_addr;
1092         }
1093         return (rip_output(m, so, dst));
1094 }
1095 #endif /* INET */
1096
1097 static int
1098 rip_pcblist(SYSCTL_HANDLER_ARGS)
1099 {
1100         struct xinpgen xig;
1101         struct epoch_tracker et;
1102         struct inpcb *inp;
1103         int error;
1104
1105         if (req->newptr != 0)
1106                 return (EPERM);
1107
1108         if (req->oldptr == 0) {
1109                 int n;
1110
1111                 n = V_ripcbinfo.ipi_count;
1112                 n += imax(n / 8, 10);
1113                 req->oldidx = 2 * (sizeof xig) + n * sizeof(struct xinpcb);
1114                 return (0);
1115         }
1116
1117         if ((error = sysctl_wire_old_buffer(req, 0)) != 0)
1118                 return (error);
1119
1120         bzero(&xig, sizeof(xig));
1121         xig.xig_len = sizeof xig;
1122         xig.xig_count = V_ripcbinfo.ipi_count;
1123         xig.xig_gen = V_ripcbinfo.ipi_gencnt;
1124         xig.xig_sogen = so_gencnt;
1125         error = SYSCTL_OUT(req, &xig, sizeof xig);
1126         if (error)
1127                 return (error);
1128
1129         NET_EPOCH_ENTER(et);
1130         for (inp = CK_LIST_FIRST(V_ripcbinfo.ipi_listhead);
1131             inp != NULL;
1132             inp = CK_LIST_NEXT(inp, inp_list)) {
1133                 INP_RLOCK(inp);
1134                 if (inp->inp_gencnt <= xig.xig_gen &&
1135                     cr_canseeinpcb(req->td->td_ucred, inp) == 0) {
1136                         struct xinpcb xi;
1137
1138                         in_pcbtoxinpcb(inp, &xi);
1139                         INP_RUNLOCK(inp);
1140                         error = SYSCTL_OUT(req, &xi, sizeof xi);
1141                         if (error)
1142                                 break;
1143                 } else
1144                         INP_RUNLOCK(inp);
1145         }
1146         NET_EPOCH_EXIT(et);
1147
1148         if (!error) {
1149                 /*
1150                  * Give the user an updated idea of our state.  If the
1151                  * generation differs from what we told her before, she knows
1152                  * that something happened while we were processing this
1153                  * request, and it might be necessary to retry.
1154                  */
1155                 xig.xig_gen = V_ripcbinfo.ipi_gencnt;
1156                 xig.xig_sogen = so_gencnt;
1157                 xig.xig_count = V_ripcbinfo.ipi_count;
1158                 error = SYSCTL_OUT(req, &xig, sizeof xig);
1159         }
1160
1161         return (error);
1162 }
1163
1164 SYSCTL_PROC(_net_inet_raw, OID_AUTO/*XXX*/, pcblist,
1165     CTLTYPE_OPAQUE | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
1166     rip_pcblist, "S,xinpcb",
1167     "List of active raw IP sockets");
1168
1169 #ifdef INET
1170 struct pr_usrreqs rip_usrreqs = {
1171         .pru_abort =            rip_abort,
1172         .pru_attach =           rip_attach,
1173         .pru_bind =             rip_bind,
1174         .pru_connect =          rip_connect,
1175         .pru_control =          in_control,
1176         .pru_detach =           rip_detach,
1177         .pru_disconnect =       rip_disconnect,
1178         .pru_peeraddr =         in_getpeeraddr,
1179         .pru_send =             rip_send,
1180         .pru_shutdown =         rip_shutdown,
1181         .pru_sockaddr =         in_getsockaddr,
1182         .pru_sosetlabel =       in_pcbsosetlabel,
1183         .pru_close =            rip_close,
1184 };
1185 #endif /* INET */