2 * Copyright (c) 2002-2009 Luigi Rizzo, Universita` di Pisa
4 * Supported by: Valeria Paoli
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 #include <sys/cdefs.h>
29 __FBSDID("$FreeBSD$");
32 * Sockopt support for ipfw. The routines here implement
33 * the upper half of the ipfw code.
39 #error IPFIREWALL requires INET.
41 #include "opt_inet6.h"
43 #include <sys/param.h>
44 #include <sys/systm.h>
45 #include <sys/malloc.h>
46 #include <sys/mbuf.h> /* struct m_tag used by nested headers */
47 #include <sys/kernel.h>
51 #include <sys/rwlock.h>
52 #include <sys/socket.h>
53 #include <sys/socketvar.h>
54 #include <sys/sysctl.h>
55 #include <sys/syslog.h>
57 #include <net/route.h>
60 #include <netinet/in.h>
61 #include <netinet/ip_var.h> /* hooks */
62 #include <netinet/ip_fw.h>
64 #include <netpfil/ipfw/ip_fw_private.h>
67 #include <security/mac/mac_framework.h>
70 MALLOC_DEFINE(M_IPFW, "IpFw/IpAcct", "IpFw/IpAcct chain's");
73 * static variables followed by global ones (none in this file)
77 * Find the smallest rule >= key, id.
78 * We could use bsearch but it is so simple that we code it directly
81 ipfw_find_rule(struct ip_fw_chain *chain, uint32_t key, uint32_t id)
86 for (lo = 0, hi = chain->n_rules - 1; lo < hi;) {
90 lo = i + 1; /* continue from the next one */
91 else if (r->rulenum > key)
92 hi = i; /* this might be good */
94 lo = i + 1; /* continue from the next one */
95 else /* r->id >= id */
96 hi = i; /* this might be good */
102 * allocate a new map, returns the chain locked. extra is the number
103 * of entries to add or delete.
105 static struct ip_fw **
106 get_map(struct ip_fw_chain *chain, int extra, int locked)
113 i = chain->n_rules + extra;
114 map = malloc(i * sizeof(struct ip_fw *), M_IPFW,
115 locked ? M_NOWAIT : M_WAITOK);
117 printf("%s: cannot allocate map\n", __FUNCTION__);
121 IPFW_UH_WLOCK(chain);
122 if (i >= chain->n_rules + extra) /* good */
124 /* otherwise we lost the race, free and retry */
126 IPFW_UH_WUNLOCK(chain);
132 * swap the maps. It is supposed to be called with IPFW_UH_WLOCK
134 static struct ip_fw **
135 swap_map(struct ip_fw_chain *chain, struct ip_fw **new_map, int new_len)
137 struct ip_fw **old_map;
141 chain->n_rules = new_len;
142 old_map = chain->map;
143 chain->map = new_map;
149 * Add a new rule to the list. Copy the rule into a malloc'ed area, then
150 * possibly create a rule number and add the rule to the list.
151 * Update the rule_number in the input struct so the caller knows it as well.
152 * XXX DO NOT USE FOR THE DEFAULT RULE.
153 * Must be called without IPFW_UH held
156 ipfw_add_rule(struct ip_fw_chain *chain, struct ip_fw *input_rule)
159 int i, l, insert_before;
160 struct ip_fw **map; /* the new array of pointers */
162 if (chain->rules == NULL || input_rule->rulenum > IPFW_DEFAULT_RULE-1)
165 l = RULESIZE(input_rule);
166 rule = malloc(l, M_IPFW, M_WAITOK | M_ZERO);
169 /* get_map returns with IPFW_UH_WLOCK if successful */
170 map = get_map(chain, 1, 0 /* not locked */);
176 bcopy(input_rule, rule, l);
177 /* clear fields not settable from userland */
179 rule->next_rule = NULL;
184 if (V_autoinc_step < 1)
186 else if (V_autoinc_step > 1000)
187 V_autoinc_step = 1000;
188 /* find the insertion point, we will insert before */
189 insert_before = rule->rulenum ? rule->rulenum + 1 : IPFW_DEFAULT_RULE;
190 i = ipfw_find_rule(chain, insert_before, 0);
191 /* duplicate first part */
193 bcopy(chain->map, map, i * sizeof(struct ip_fw *));
195 /* duplicate remaining part, we always have the default rule */
196 bcopy(chain->map + i, map + i + 1,
197 sizeof(struct ip_fw *) *(chain->n_rules - i));
198 if (rule->rulenum == 0) {
199 /* write back the number */
200 rule->rulenum = i > 0 ? map[i-1]->rulenum : 0;
201 if (rule->rulenum < IPFW_DEFAULT_RULE - V_autoinc_step)
202 rule->rulenum += V_autoinc_step;
203 input_rule->rulenum = rule->rulenum;
206 rule->id = chain->id + 1;
207 map = swap_map(chain, map, chain->n_rules + 1);
208 chain->static_len += l;
209 IPFW_UH_WUNLOCK(chain);
216 * Reclaim storage associated with a list of rules. This is
217 * typically the list created using remove_rule.
218 * A NULL pointer on input is handled correctly.
221 ipfw_reap_rules(struct ip_fw *head)
225 while ((rule = head) != NULL) {
232 * Used by del_entry() to check if a rule should be kept.
233 * Returns 1 if the rule must be kept, 0 otherwise.
235 * Called with cmd = {0,1,5}.
236 * cmd == 0 matches on rule numbers, excludes rules in RESVD_SET if n == 0 ;
237 * cmd == 1 matches on set numbers only, rule numbers are ignored;
238 * cmd == 5 matches on rule and set numbers.
240 * n == 0 is a wildcard for rule numbers, there is no wildcard for sets.
243 * (default || reserved || !match_set || !match_number)
245 * default ::= (rule->rulenum == IPFW_DEFAULT_RULE)
246 * // the default rule is always protected
248 * reserved ::= (cmd == 0 && n == 0 && rule->set == RESVD_SET)
249 * // RESVD_SET is protected only if cmd == 0 and n == 0 ("ipfw flush")
251 * match_set ::= (cmd == 0 || rule->set == set)
252 * // set number is ignored for cmd == 0
254 * match_number ::= (cmd == 1 || n == 0 || n == rule->rulenum)
255 * // number is ignored for cmd == 1 or n == 0
259 keep_rule(struct ip_fw *rule, uint8_t cmd, uint8_t set, uint32_t n)
262 (rule->rulenum == IPFW_DEFAULT_RULE) ||
263 (cmd == 0 && n == 0 && rule->set == RESVD_SET) ||
264 !(cmd == 0 || rule->set == set) ||
265 !(cmd == 1 || n == 0 || n == rule->rulenum);
269 * Remove all rules with given number, or do set manipulation.
270 * Assumes chain != NULL && *chain != NULL.
272 * The argument is an uint32_t. The low 16 bit are the rule or set number;
273 * the next 8 bits are the new set; the top 8 bits indicate the command:
275 * 0 delete rules numbered "rulenum"
276 * 1 delete rules in set "rulenum"
277 * 2 move rules "rulenum" to set "new_set"
278 * 3 move rules from set "rulenum" to set "new_set"
279 * 4 swap sets "rulenum" and "new_set"
280 * 5 delete rules "rulenum" and set "new_set"
283 del_entry(struct ip_fw_chain *chain, uint32_t arg)
286 uint32_t num; /* rule number or old_set */
287 uint8_t cmd, new_set;
288 int start, end, i, ofs, n;
289 struct ip_fw **map = NULL;
293 cmd = (arg >> 24) & 0xff;
294 new_set = (arg >> 16) & 0xff;
296 if (cmd > 5 || new_set > RESVD_SET)
298 if (cmd == 0 || cmd == 2 || cmd == 5) {
299 if (num >= IPFW_DEFAULT_RULE)
302 if (num > RESVD_SET) /* old_set */
306 IPFW_UH_WLOCK(chain); /* arbitrate writers */
307 chain->reap = NULL; /* prepare for deletions */
310 case 0: /* delete rules "num" (num == 0 matches all) */
311 case 1: /* delete all rules in set N */
312 case 5: /* delete rules with number N and set "new_set". */
315 * Locate first rule to delete (start), the rule after
316 * the last one to delete (end), and count how many
317 * rules to delete (n). Always use keep_rule() to
318 * determine which rules to keep.
322 /* look for a specific set including RESVD_SET.
323 * Must scan the entire range, ignore num.
326 for (start = -1, end = i = 0; i < chain->n_rules; i++) {
327 if (keep_rule(chain->map[i], cmd, new_set, 0))
334 end++; /* first non-matching */
336 /* Optimized search on rule numbers */
337 start = ipfw_find_rule(chain, num, 0);
338 for (end = start; end < chain->n_rules; end++) {
339 rule = chain->map[end];
340 if (num > 0 && rule->rulenum != num)
342 if (!keep_rule(rule, cmd, new_set, num))
348 /* A flush request (arg == 0 or cmd == 1) on empty
349 * ruleset returns with no error. On the contrary,
350 * if there is no match on a specific request,
353 if (arg != 0 && cmd != 1)
358 /* We have something to delete. Allocate the new map */
359 map = get_map(chain, -n, 1 /* locked */);
365 /* 1. bcopy the initial part of the map */
367 bcopy(chain->map, map, start * sizeof(struct ip_fw *));
368 /* 2. copy active rules between start and end */
369 for (i = ofs = start; i < end; i++) {
370 rule = chain->map[i];
371 if (keep_rule(rule, cmd, new_set, num))
374 /* 3. copy the final part of the map */
375 bcopy(chain->map + end, map + ofs,
376 (chain->n_rules - end) * sizeof(struct ip_fw *));
377 /* 4. swap the maps (under BH_LOCK) */
378 map = swap_map(chain, map, chain->n_rules - n);
379 /* 5. now remove the rules deleted from the old map */
380 for (i = start; i < end; i++) {
383 if (keep_rule(rule, cmd, new_set, num))
386 chain->static_len -= l;
387 ipfw_remove_dyn_children(rule);
388 rule->x_next = chain->reap;
394 * In the next 3 cases the loop stops at (n_rules - 1)
395 * because the default rule is never eligible..
398 case 2: /* move rules with given RULE number to new set */
399 for (i = 0; i < chain->n_rules - 1; i++) {
400 rule = chain->map[i];
401 if (rule->rulenum == num)
406 case 3: /* move rules with given SET number to new set */
407 for (i = 0; i < chain->n_rules - 1; i++) {
408 rule = chain->map[i];
409 if (rule->set == num)
414 case 4: /* swap two sets */
415 for (i = 0; i < chain->n_rules - 1; i++) {
416 rule = chain->map[i];
417 if (rule->set == num)
419 else if (rule->set == new_set)
427 IPFW_UH_WUNLOCK(chain);
428 ipfw_reap_rules(rule);
435 * Clear counters for a specific rule.
436 * Normally run under IPFW_UH_RLOCK, but these are idempotent ops
437 * so we only care that rules do not disappear.
440 clear_counters(struct ip_fw *rule, int log_only)
442 ipfw_insn_log *l = (ipfw_insn_log *)ACTION_PTR(rule);
445 rule->bcnt = rule->pcnt = 0;
448 if (l->o.opcode == O_LOG)
449 l->log_left = l->max_log;
453 * Reset some or all counters on firewall rules.
454 * The argument `arg' is an u_int32_t. The low 16 bit are the rule number,
455 * the next 8 bits are the set number, the top 8 bits are the command:
456 * 0 work with rules from all set's;
457 * 1 work with rules only from specified set.
458 * Specified rule number is zero if we want to clear all entries.
459 * log_only is 1 if we only want to reset logs, zero otherwise.
462 zero_entry(struct ip_fw_chain *chain, u_int32_t arg, int log_only)
468 uint16_t rulenum = arg & 0xffff;
469 uint8_t set = (arg >> 16) & 0xff;
470 uint8_t cmd = (arg >> 24) & 0xff;
474 if (cmd == 1 && set > RESVD_SET)
477 IPFW_UH_RLOCK(chain);
479 V_norule_counter = 0;
480 for (i = 0; i < chain->n_rules; i++) {
481 rule = chain->map[i];
482 /* Skip rules not in our set. */
483 if (cmd == 1 && rule->set != set)
485 clear_counters(rule, log_only);
487 msg = log_only ? "All logging counts reset" :
488 "Accounting cleared";
491 for (i = 0; i < chain->n_rules; i++) {
492 rule = chain->map[i];
493 if (rule->rulenum == rulenum) {
494 if (cmd == 0 || rule->set == set)
495 clear_counters(rule, log_only);
498 if (rule->rulenum > rulenum)
501 if (!cleared) { /* we did not find any matching rules */
502 IPFW_UH_RUNLOCK(chain);
505 msg = log_only ? "logging count reset" : "cleared";
507 IPFW_UH_RUNLOCK(chain);
510 int lev = LOG_SECURITY | LOG_NOTICE;
513 log(lev, "ipfw: Entry %d %s.\n", rulenum, msg);
515 log(lev, "ipfw: %s.\n", msg);
521 * Check validity of the structure before insert.
522 * Rules are simple, so this mostly need to check rule sizes.
525 check_ipfw_struct(struct ip_fw *rule, int size)
531 if (size < sizeof(*rule)) {
532 printf("ipfw: rule too short\n");
535 /* first, check for valid size */
538 printf("ipfw: size mismatch (have %d want %d)\n", size, l);
541 if (rule->act_ofs >= rule->cmd_len) {
542 printf("ipfw: bogus action offset (%u > %u)\n",
543 rule->act_ofs, rule->cmd_len - 1);
547 * Now go for the individual checks. Very simple ones, basically only
550 for (l = rule->cmd_len, cmd = rule->cmd ;
551 l > 0 ; l -= cmdlen, cmd += cmdlen) {
554 printf("ipfw: opcode %d size truncated\n",
558 switch (cmd->opcode) {
588 if (cmdlen != F_INSN_SIZE(ipfw_insn))
593 if (cmdlen != F_INSN_SIZE(ipfw_insn))
595 if (cmd->arg1 >= rt_numfibs) {
596 printf("ipfw: invalid fib number %d\n",
603 if (cmdlen != F_INSN_SIZE(ipfw_insn))
605 if ((cmd->arg1 != IP_FW_TABLEARG) &&
606 (cmd->arg1 >= rt_numfibs)) {
607 printf("ipfw: invalid fib number %d\n",
622 if (cmdlen != F_INSN_SIZE(ipfw_insn_u32))
627 if (cmdlen != F_INSN_SIZE(ipfw_insn_limit))
632 if (cmdlen != F_INSN_SIZE(ipfw_insn_log))
635 ((ipfw_insn_log *)cmd)->log_left =
636 ((ipfw_insn_log *)cmd)->max_log;
642 /* only odd command lengths */
643 if ( !(cmdlen & 1) || cmdlen > 31)
649 if (cmd->arg1 == 0 || cmd->arg1 > 256) {
650 printf("ipfw: invalid set size %d\n",
654 if (cmdlen != F_INSN_SIZE(ipfw_insn_u32) +
659 case O_IP_SRC_LOOKUP:
660 case O_IP_DST_LOOKUP:
661 if (cmd->arg1 >= IPFW_TABLES_MAX) {
662 printf("ipfw: invalid table number %d\n",
666 if (cmdlen != F_INSN_SIZE(ipfw_insn) &&
667 cmdlen != F_INSN_SIZE(ipfw_insn_u32) + 1 &&
668 cmdlen != F_INSN_SIZE(ipfw_insn_u32))
672 if (cmdlen != F_INSN_SIZE(ipfw_insn_mac))
683 if (cmdlen < 1 || cmdlen > 31)
689 case O_IP_DSTPORT: /* XXX artificial limit, 30 port pairs */
690 if (cmdlen < 2 || cmdlen > 31)
697 if (cmdlen != F_INSN_SIZE(ipfw_insn_if))
702 if (cmdlen != F_INSN_SIZE(ipfw_insn_altq))
708 if (cmdlen != F_INSN_SIZE(ipfw_insn))
713 #ifdef IPFIREWALL_FORWARD
714 if (cmdlen != F_INSN_SIZE(ipfw_insn_sa))
723 #ifdef IPFIREWALL_FORWARD
724 if (cmdlen != F_INSN_SIZE(ipfw_insn_sa6))
734 if (ip_divert_ptr == NULL)
740 if (ng_ipfw_input_p == NULL)
745 if (!IPFW_NAT_LOADED)
747 if (cmdlen != F_INSN_SIZE(ipfw_insn_nat))
750 case O_FORWARD_MAC: /* XXX not implemented yet */
763 if (cmdlen != F_INSN_SIZE(ipfw_insn))
767 printf("ipfw: opcode %d, multiple actions"
774 printf("ipfw: opcode %d, action must be"
783 if (cmdlen != F_INSN_SIZE(struct in6_addr) +
784 F_INSN_SIZE(ipfw_insn))
789 if (cmdlen != F_INSN_SIZE(ipfw_insn_u32) +
790 ((ipfw_insn_u32 *)cmd)->o.arg1)
796 if ( !(cmdlen & 1) || cmdlen > 127)
800 if( cmdlen != F_INSN_SIZE( ipfw_insn_icmp6 ) )
806 switch (cmd->opcode) {
819 printf("ipfw: no IPv6 support in kernel\n");
820 return EPROTONOSUPPORT;
823 printf("ipfw: opcode %d, unknown opcode\n",
829 if (have_action == 0) {
830 printf("ipfw: missing action\n");
836 printf("ipfw: opcode %d size %d wrong\n",
837 cmd->opcode, cmdlen);
843 * Translation of requests for compatibility with FreeBSD 7.2/8.
844 * a static variable tells us if we have an old client from userland,
845 * and if necessary we translate requests and responses between the
851 struct ip_fw7 *next; /* linked list of rules */
852 struct ip_fw7 *next_rule; /* ptr to next [skipto] rule */
853 /* 'next_rule' is used to pass up 'set_disable' status */
855 uint16_t act_ofs; /* offset of action in 32-bit units */
856 uint16_t cmd_len; /* # of 32-bit words in cmd */
857 uint16_t rulenum; /* rule number */
858 uint8_t set; /* rule set (0..31) */
859 // #define RESVD_SET 31 /* set for default and persistent rules */
860 uint8_t _pad; /* padding */
861 // uint32_t id; /* rule id, only in v.8 */
862 /* These fields are present in all rules. */
863 uint64_t pcnt; /* Packet counter */
864 uint64_t bcnt; /* Byte counter */
865 uint32_t timestamp; /* tv_sec of last match */
867 ipfw_insn cmd[1]; /* storage for commands */
870 int convert_rule_to_7(struct ip_fw *rule);
871 int convert_rule_to_8(struct ip_fw *rule);
874 #define RULESIZE7(rule) (sizeof(struct ip_fw7) + \
875 ((struct ip_fw7 *)(rule))->cmd_len * 4 - 4)
880 * Copy the static and dynamic rules to the supplied buffer
881 * and return the amount of space actually used.
882 * Must be run under IPFW_UH_RLOCK
885 ipfw_getrules(struct ip_fw_chain *chain, void *buf, size_t space)
888 char *ep = bp + space;
889 struct ip_fw *rule, *dst;
893 boot_seconds = boottime.tv_sec;
894 for (i = 0; i < chain->n_rules; i++) {
895 rule = chain->map[i];
898 /* Convert rule to FreeBSd 7.2 format */
900 if (bp + l + sizeof(uint32_t) <= ep) {
902 bcopy(rule, bp, l + sizeof(uint32_t));
903 error = convert_rule_to_7((struct ip_fw *) bp);
905 return 0; /*XXX correct? */
907 * XXX HACK. Store the disable mask in the "next"
908 * pointer in a wild attempt to keep the ABI the same.
909 * Why do we do this on EVERY rule?
911 bcopy(&V_set_disable,
912 &(((struct ip_fw7 *)bp)->next_rule),
913 sizeof(V_set_disable));
914 if (((struct ip_fw7 *)bp)->timestamp)
915 ((struct ip_fw7 *)bp)->timestamp += boot_seconds;
918 continue; /* go to next rule */
921 /* normal mode, don't touch rules */
923 if (bp + l > ep) { /* should not happen */
924 printf("overflow dumping static rules\n");
927 dst = (struct ip_fw *)bp;
930 * XXX HACK. Store the disable mask in the "next"
931 * pointer in a wild attempt to keep the ABI the same.
932 * Why do we do this on EVERY rule?
934 bcopy(&V_set_disable, &dst->next_rule, sizeof(V_set_disable));
936 dst->timestamp += boot_seconds;
939 ipfw_get_dynamic(&bp, ep); /* protected by the dynamic lock */
940 return (bp - (char *)buf);
944 #define IP_FW3_OPLENGTH(x) ((x)->sopt_valsize - sizeof(ip_fw3_opheader))
946 * {set|get}sockopt parser.
949 ipfw_ctl(struct sockopt *sopt)
951 #define RULE_MAXSIZE (256*sizeof(u_int32_t))
953 size_t size, len, valsize;
954 struct ip_fw *buf, *rule;
955 struct ip_fw_chain *chain;
956 u_int32_t rulenum[2];
959 ip_fw3_opheader *op3 = NULL;
961 error = priv_check(sopt->sopt_td, PRIV_NETINET_IPFW);
966 * Disallow modifications in really-really secure mode, but still allow
967 * the logging counters to be reset.
969 if (sopt->sopt_name == IP_FW_ADD ||
970 (sopt->sopt_dir == SOPT_SET && sopt->sopt_name != IP_FW_RESETLOG)) {
971 error = securelevel_ge(sopt->sopt_td->td_ucred, 3);
976 chain = &V_layer3_chain;
979 /* Save original valsize before it is altered via sooptcopyin() */
980 valsize = sopt->sopt_valsize;
981 if ((opt = sopt->sopt_name) == IP_FW3) {
983 * Copy not less than sizeof(ip_fw3_opheader).
984 * We hope any IP_FW3 command will fit into 128-byte buffer.
986 if ((error = sooptcopyin(sopt, xbuf, sizeof(xbuf),
987 sizeof(ip_fw3_opheader))) != 0)
989 op3 = (ip_fw3_opheader *)xbuf;
996 * pass up a copy of the current rules. Static rules
997 * come first (the last of which has number IPFW_DEFAULT_RULE),
998 * followed by a possibly empty list of dynamic rule.
999 * The last dynamic rule has NULL in the "next" field.
1001 * Note that the calculated size is used to bound the
1002 * amount of data returned to the user. The rule set may
1003 * change between calculating the size and returning the
1004 * data in which case we'll just return what fits.
1009 size = chain->static_len;
1010 size += ipfw_dyn_len();
1011 if (size >= sopt->sopt_valsize)
1013 buf = malloc(size, M_TEMP, M_WAITOK);
1016 IPFW_UH_RLOCK(chain);
1017 /* check again how much space we need */
1018 want = chain->static_len + ipfw_dyn_len();
1020 len = ipfw_getrules(chain, buf, size);
1021 IPFW_UH_RUNLOCK(chain);
1023 error = sooptcopyout(sopt, buf, len);
1031 /* locking is done within del_entry() */
1032 error = del_entry(chain, 0); /* special case, rule=0, cmd=0 means all */
1036 rule = malloc(RULE_MAXSIZE, M_TEMP, M_WAITOK);
1037 error = sooptcopyin(sopt, rule, RULE_MAXSIZE,
1038 sizeof(struct ip_fw7) );
1041 * If the size of commands equals RULESIZE7 then we assume
1042 * a FreeBSD7.2 binary is talking to us (set is7=1).
1043 * is7 is persistent so the next 'ipfw list' command
1044 * will use this format.
1045 * NOTE: If wrong version is guessed (this can happen if
1046 * the first ipfw command is 'ipfw [pipe] list')
1047 * the ipfw binary may crash or loop infinitly...
1049 if (sopt->sopt_valsize == RULESIZE7(rule)) {
1051 error = convert_rule_to_8(rule);
1055 error = check_ipfw_struct(rule, RULESIZE(rule));
1059 error = check_ipfw_struct(rule, sopt->sopt_valsize);
1062 /* locking is done within ipfw_add_rule() */
1063 error = ipfw_add_rule(chain, rule);
1064 size = RULESIZE(rule);
1065 if (!error && sopt->sopt_dir == SOPT_GET) {
1067 error = convert_rule_to_7(rule);
1068 size = RULESIZE7(rule);
1072 error = sooptcopyout(sopt, rule, size);
1080 * IP_FW_DEL is used for deleting single rules or sets,
1081 * and (ab)used to atomically manipulate sets. Argument size
1082 * is used to distinguish between the two:
1084 * delete single rule or set of rules,
1085 * or reassign rules (or sets) to a different set.
1086 * 2*sizeof(u_int32_t)
1087 * atomic disable/enable sets.
1088 * first u_int32_t contains sets to be disabled,
1089 * second u_int32_t contains sets to be enabled.
1091 error = sooptcopyin(sopt, rulenum,
1092 2*sizeof(u_int32_t), sizeof(u_int32_t));
1095 size = sopt->sopt_valsize;
1096 if (size == sizeof(u_int32_t) && rulenum[0] != 0) {
1097 /* delete or reassign, locking done in del_entry() */
1098 error = del_entry(chain, rulenum[0]);
1099 } else if (size == 2*sizeof(u_int32_t)) { /* set enable/disable */
1100 IPFW_UH_WLOCK(chain);
1102 (V_set_disable | rulenum[0]) & ~rulenum[1] &
1103 ~(1<<RESVD_SET); /* set RESVD_SET always enabled */
1104 IPFW_UH_WUNLOCK(chain);
1110 case IP_FW_RESETLOG: /* argument is an u_int_32, the rule number */
1112 if (sopt->sopt_val != 0) {
1113 error = sooptcopyin(sopt, rulenum,
1114 sizeof(u_int32_t), sizeof(u_int32_t));
1118 error = zero_entry(chain, rulenum[0],
1119 sopt->sopt_name == IP_FW_RESETLOG);
1122 /*--- TABLE manipulations are protected by the IPFW_LOCK ---*/
1123 case IP_FW_TABLE_ADD:
1125 ipfw_table_entry ent;
1127 error = sooptcopyin(sopt, &ent,
1128 sizeof(ent), sizeof(ent));
1131 error = ipfw_add_table_entry(chain, ent.tbl,
1132 &ent.addr, sizeof(ent.addr), ent.masklen,
1133 IPFW_TABLE_CIDR, ent.value);
1137 case IP_FW_TABLE_DEL:
1139 ipfw_table_entry ent;
1141 error = sooptcopyin(sopt, &ent,
1142 sizeof(ent), sizeof(ent));
1145 error = ipfw_del_table_entry(chain, ent.tbl,
1146 &ent.addr, sizeof(ent.addr), ent.masklen, IPFW_TABLE_CIDR);
1150 case IP_FW_TABLE_XADD: /* IP_FW3 */
1151 case IP_FW_TABLE_XDEL: /* IP_FW3 */
1153 ipfw_table_xentry *xent = (ipfw_table_xentry *)(op3 + 1);
1155 /* Check minimum header size */
1156 if (IP_FW3_OPLENGTH(sopt) < offsetof(ipfw_table_xentry, k)) {
1161 /* Check if len field is valid */
1162 if (xent->len > sizeof(ipfw_table_xentry)) {
1167 len = xent->len - offsetof(ipfw_table_xentry, k);
1169 error = (opt == IP_FW_TABLE_XADD) ?
1170 ipfw_add_table_entry(chain, xent->tbl, &xent->k,
1171 len, xent->masklen, xent->type, xent->value) :
1172 ipfw_del_table_entry(chain, xent->tbl, &xent->k,
1173 len, xent->masklen, xent->type);
1177 case IP_FW_TABLE_FLUSH:
1181 error = sooptcopyin(sopt, &tbl,
1182 sizeof(tbl), sizeof(tbl));
1185 error = ipfw_flush_table(chain, tbl);
1189 case IP_FW_TABLE_GETSIZE:
1193 if ((error = sooptcopyin(sopt, &tbl, sizeof(tbl),
1197 error = ipfw_count_table(chain, tbl, &cnt);
1198 IPFW_RUNLOCK(chain);
1201 error = sooptcopyout(sopt, &cnt, sizeof(cnt));
1205 case IP_FW_TABLE_LIST:
1209 if (sopt->sopt_valsize < sizeof(*tbl)) {
1213 size = sopt->sopt_valsize;
1214 tbl = malloc(size, M_TEMP, M_WAITOK);
1215 error = sooptcopyin(sopt, tbl, size, sizeof(*tbl));
1220 tbl->size = (size - sizeof(*tbl)) /
1221 sizeof(ipfw_table_entry);
1223 error = ipfw_dump_table(chain, tbl);
1224 IPFW_RUNLOCK(chain);
1229 error = sooptcopyout(sopt, tbl, size);
1234 case IP_FW_TABLE_XGETSIZE: /* IP_FW3 */
1238 if (IP_FW3_OPLENGTH(sopt) < sizeof(uint32_t)) {
1243 tbl = (uint32_t *)(op3 + 1);
1246 error = ipfw_count_xtable(chain, *tbl, tbl);
1247 IPFW_RUNLOCK(chain);
1250 error = sooptcopyout(sopt, op3, sopt->sopt_valsize);
1254 case IP_FW_TABLE_XLIST: /* IP_FW3 */
1258 if ((size = valsize) < sizeof(ipfw_xtable)) {
1263 tbl = malloc(size, M_TEMP, M_ZERO | M_WAITOK);
1264 memcpy(tbl, op3, sizeof(ipfw_xtable));
1266 /* Get maximum number of entries we can store */
1267 tbl->size = (size - sizeof(ipfw_xtable)) /
1268 sizeof(ipfw_table_xentry);
1270 error = ipfw_dump_xtable(chain, tbl);
1271 IPFW_RUNLOCK(chain);
1277 /* Revert size field back to bytes */
1278 tbl->size = tbl->size * sizeof(ipfw_table_xentry) +
1281 * Since we call sooptcopyin() with small buffer, sopt_valsize is
1282 * decreased to reflect supplied buffer size. Set it back to original value
1284 sopt->sopt_valsize = valsize;
1285 error = sooptcopyout(sopt, tbl, size);
1290 /*--- NAT operations are protected by the IPFW_LOCK ---*/
1292 if (IPFW_NAT_LOADED)
1293 error = ipfw_nat_cfg_ptr(sopt);
1295 printf("IP_FW_NAT_CFG: %s\n",
1296 "ipfw_nat not present, please load it");
1302 if (IPFW_NAT_LOADED)
1303 error = ipfw_nat_del_ptr(sopt);
1305 printf("IP_FW_NAT_DEL: %s\n",
1306 "ipfw_nat not present, please load it");
1311 case IP_FW_NAT_GET_CONFIG:
1312 if (IPFW_NAT_LOADED)
1313 error = ipfw_nat_get_cfg_ptr(sopt);
1315 printf("IP_FW_NAT_GET_CFG: %s\n",
1316 "ipfw_nat not present, please load it");
1321 case IP_FW_NAT_GET_LOG:
1322 if (IPFW_NAT_LOADED)
1323 error = ipfw_nat_get_log_ptr(sopt);
1325 printf("IP_FW_NAT_GET_LOG: %s\n",
1326 "ipfw_nat not present, please load it");
1332 printf("ipfw: ipfw_ctl invalid option %d\n", sopt->sopt_name);
1341 #define RULE_MAXSIZE (256*sizeof(u_int32_t))
1343 /* Functions to convert rules 7.2 <==> 8.0 */
1345 convert_rule_to_7(struct ip_fw *rule)
1347 /* Used to modify original rule */
1348 struct ip_fw7 *rule7 = (struct ip_fw7 *)rule;
1349 /* copy of original rule, version 8 */
1352 /* Used to copy commands */
1353 ipfw_insn *ccmd, *dst;
1354 int ll = 0, ccmdlen = 0;
1356 tmp = malloc(RULE_MAXSIZE, M_TEMP, M_NOWAIT | M_ZERO);
1358 return 1; //XXX error
1360 bcopy(rule, tmp, RULE_MAXSIZE);
1363 rule7->_pad = tmp->_pad;
1364 rule7->set = tmp->set;
1365 rule7->rulenum = tmp->rulenum;
1366 rule7->cmd_len = tmp->cmd_len;
1367 rule7->act_ofs = tmp->act_ofs;
1368 rule7->next_rule = (struct ip_fw7 *)tmp->next_rule;
1369 rule7->next = (struct ip_fw7 *)tmp->x_next;
1370 rule7->cmd_len = tmp->cmd_len;
1371 rule7->pcnt = tmp->pcnt;
1372 rule7->bcnt = tmp->bcnt;
1373 rule7->timestamp = tmp->timestamp;
1376 for (ll = tmp->cmd_len, ccmd = tmp->cmd, dst = rule7->cmd ;
1377 ll > 0 ; ll -= ccmdlen, ccmd += ccmdlen, dst += ccmdlen) {
1378 ccmdlen = F_LEN(ccmd);
1380 bcopy(ccmd, dst, F_LEN(ccmd)*sizeof(uint32_t));
1382 if (dst->opcode > O_NAT)
1383 /* O_REASS doesn't exists in 7.2 version, so
1384 * decrement opcode if it is after O_REASS
1389 printf("ipfw: opcode %d size truncated\n",
1400 convert_rule_to_8(struct ip_fw *rule)
1402 /* Used to modify original rule */
1403 struct ip_fw7 *rule7 = (struct ip_fw7 *) rule;
1405 /* Used to copy commands */
1406 ipfw_insn *ccmd, *dst;
1407 int ll = 0, ccmdlen = 0;
1409 /* Copy of original rule */
1410 struct ip_fw7 *tmp = malloc(RULE_MAXSIZE, M_TEMP, M_NOWAIT | M_ZERO);
1412 return 1; //XXX error
1415 bcopy(rule7, tmp, RULE_MAXSIZE);
1417 for (ll = tmp->cmd_len, ccmd = tmp->cmd, dst = rule->cmd ;
1418 ll > 0 ; ll -= ccmdlen, ccmd += ccmdlen, dst += ccmdlen) {
1419 ccmdlen = F_LEN(ccmd);
1421 bcopy(ccmd, dst, F_LEN(ccmd)*sizeof(uint32_t));
1423 if (dst->opcode > O_NAT)
1424 /* O_REASS doesn't exists in 7.2 version, so
1425 * increment opcode if it is after O_REASS
1430 printf("ipfw: opcode %d size truncated\n",
1436 rule->_pad = tmp->_pad;
1437 rule->set = tmp->set;
1438 rule->rulenum = tmp->rulenum;
1439 rule->cmd_len = tmp->cmd_len;
1440 rule->act_ofs = tmp->act_ofs;
1441 rule->next_rule = (struct ip_fw *)tmp->next_rule;
1442 rule->x_next = (struct ip_fw *)tmp->next;
1443 rule->cmd_len = tmp->cmd_len;
1444 rule->id = 0; /* XXX see if is ok = 0 */
1445 rule->pcnt = tmp->pcnt;
1446 rule->bcnt = tmp->bcnt;
1447 rule->timestamp = tmp->timestamp;