2 * firewall3 - 3rd OpenWrt UCI firewall implementation
4 * Copyright (C) 2013 Jo-Philipp Wich <jo@mein.io>
6 * Permission to use, copy, modify, and/or distribute this software for any
7 * purpose with or without fee is hereby granted, provided that the above
8 * copyright notice and this permission notice appear in all copies.
10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
22 static struct option base_opts[] = {
23 { .name = "match", .has_arg = 1, .val = 'm' },
24 { .name = "jump", .has_arg = 1, .val = 'j' },
28 static struct xtables_globals xtg = {
30 .program_version = "4",
31 .orig_opts = base_opts,
32 #if XTABLES_VERSION_CODE > 10
33 .compat_rev = xtables_compatible_revision,
37 static struct xtables_globals xtg6 = {
39 .program_version = "6",
40 .orig_opts = base_opts,
41 #if XTABLES_VERSION_CODE > 10
42 .compat_rev = xtables_compatible_revision,
49 struct xtables_match **matches;
50 struct xtables_target **targets;
51 void (*register_match)(struct xtables_match *);
52 void (*register_target)(struct xtables_target *);
56 /* Required by certain extensions like SNAT and DNAT */
57 int kernel_version = 0;
60 get_kernel_version(void)
62 static struct utsname uts;
63 int x = 0, y = 0, z = 0;
65 if (uname(&uts) == -1)
66 sprintf(uts.release, "3.0.0");
68 sscanf(uts.release, "%d.%d.%d", &x, &y, &z);
69 kernel_version = 0x10000 * x + 0x100 * y + z;
72 static void fw3_init_extensions(void)
82 struct fw3_ipt_handle *
83 fw3_ipt_open(enum fw3_family family, enum fw3_table table)
86 struct fw3_ipt_handle *h;
88 h = fw3_alloc(sizeof(*h));
92 if (family == FW3_FAMILY_V6)
95 h->family = FW3_FAMILY_V6;
97 h->handle = ip6tc_init(fw3_flag_names[table]);
99 xtables_set_params(&xtg6);
100 xtables_set_nfproto(NFPROTO_IPV6);
105 h->family = FW3_FAMILY_V4;
107 h->handle = iptc_init(fw3_flag_names[table]);
109 xtables_set_params(&xtg);
110 xtables_set_nfproto(NFPROTO_IPV4);
120 fw3_init_extensions();
122 if (xext.register_match)
123 for (i = 0; i < xext.mcount; i++)
124 xext.register_match(xext.matches[i]);
126 if (xext.register_target)
127 for (i = 0; i < xext.tcount; i++)
128 xext.register_target(xext.targets[i]);
134 debug(struct fw3_ipt_handle *h, const char *fmt, ...)
138 printf("%s -t %s ", (h->family == FW3_FAMILY_V6) ? "ip6tables" : "iptables",
139 fw3_flag_names[h->table]);
147 fw3_ipt_set_policy(struct fw3_ipt_handle *h, const char *chain,
148 enum fw3_flag policy)
151 debug(h, "-P %s %s\n", chain, fw3_flag_names[policy]);
154 if (h->family == FW3_FAMILY_V6)
155 ip6tc_set_policy(chain, fw3_flag_names[policy], NULL, h->handle);
158 iptc_set_policy(chain, fw3_flag_names[policy], NULL, h->handle);
162 fw3_ipt_flush_chain(struct fw3_ipt_handle *h, const char *chain)
165 debug(h, "-F %s\n", chain);
168 if (h->family == FW3_FAMILY_V6)
169 ip6tc_flush_entries(chain, h->handle);
172 iptc_flush_entries(chain, h->handle);
176 delete_rules(struct fw3_ipt_handle *h, const char *target)
179 const struct ipt_entry *e;
185 if (h->family == FW3_FAMILY_V6)
187 for (chain = ip6tc_first_chain(h->handle);
189 chain = ip6tc_next_chain(h->handle))
194 const struct ip6t_entry *e6;
195 for (num = 0, e6 = ip6tc_first_rule(chain, h->handle);
197 num++, e6 = ip6tc_next_rule(e6, h->handle))
199 t = ip6tc_get_target(e6, h->handle);
201 if (*t && !strcmp(t, target))
204 debug(h, "-D %s %u\n", chain, num + 1);
206 ip6tc_delete_num_entry(chain, num, h->handle);
217 for (chain = iptc_first_chain(h->handle);
219 chain = iptc_next_chain(h->handle))
224 for (num = 0, e = iptc_first_rule(chain, h->handle);
226 num++, e = iptc_next_rule(e, h->handle))
228 t = iptc_get_target(e, h->handle);
230 if (*t && !strcmp(t, target))
233 debug(h, "-D %s %u\n", chain, num + 1);
235 iptc_delete_num_entry(chain, num, h->handle);
246 fw3_ipt_delete_chain(struct fw3_ipt_handle *h, const char *chain)
248 delete_rules(h, chain);
251 debug(h, "-X %s\n", chain);
254 if (h->family == FW3_FAMILY_V6)
255 ip6tc_delete_chain(chain, h->handle);
258 iptc_delete_chain(chain, h->handle);
262 get_rule_id(const void *base, unsigned int start, unsigned int end)
266 const struct xt_entry_match *em;
268 for (i = start; i < end; i += em->u.match_size)
272 if (strcmp(em->u.user.name, "id"))
275 memcpy(&id, em->data, sizeof(id));
277 if ((id & FW3_ID_MASK) != FW3_ID_MAGIC)
280 return (id & ~FW3_ID_MASK);
287 fw3_ipt_delete_id_rules(struct fw3_ipt_handle *h, const char *chain)
290 const struct ipt_entry *e;
295 if (h->family == FW3_FAMILY_V6)
297 if (!ip6tc_is_chain(chain, h->handle))
303 const struct ip6t_entry *e6;
304 for (num = 0, e6 = ip6tc_first_rule(chain, h->handle);
306 num++, e6 = ip6tc_next_rule(e6, h->handle))
308 id = get_rule_id(e6, sizeof(*e6), e6->target_offset);
313 debug(h, "-D %s %u\n", chain, num + 1);
315 ip6tc_delete_num_entry(chain, num, h->handle);
325 if (!iptc_is_chain(chain, h->handle))
331 for (num = 0, e = iptc_first_rule(chain, h->handle);
333 num++, e = iptc_next_rule(e, h->handle))
335 id = get_rule_id(e, sizeof(*e), e->target_offset);
340 debug(h, "-D %s %u\n", chain, num + 1);
342 iptc_delete_num_entry(chain, num, h->handle);
352 fw3_ipt_create_chain(struct fw3_ipt_handle *h, const char *fmt, ...)
358 vsnprintf(buf, sizeof(buf) - 1, fmt, ap);
362 debug(h, "-N %s\n", buf);
364 iptc_create_chain(buf, h->handle);
368 fw3_ipt_flush(struct fw3_ipt_handle *h)
373 if (h->family == FW3_FAMILY_V6)
375 for (chain = ip6tc_first_chain(h->handle);
377 chain = ip6tc_next_chain(h->handle))
379 ip6tc_flush_entries(chain, h->handle);
382 for (chain = ip6tc_first_chain(h->handle);
384 chain = ip6tc_next_chain(h->handle))
386 ip6tc_delete_chain(chain, h->handle);
392 for (chain = iptc_first_chain(h->handle);
394 chain = iptc_next_chain(h->handle))
396 iptc_flush_entries(chain, h->handle);
399 for (chain = iptc_first_chain(h->handle);
401 chain = iptc_next_chain(h->handle))
403 iptc_delete_chain(chain, h->handle);
409 chain_is_empty(struct fw3_ipt_handle *h, const char *chain)
412 if (h->family == FW3_FAMILY_V6)
413 return (!ip6tc_builtin(chain, h->handle) &&
414 !ip6tc_first_rule(chain, h->handle));
417 return (!iptc_builtin(chain, h->handle) &&
418 !iptc_first_rule(chain, h->handle));
422 fw3_ipt_gc(struct fw3_ipt_handle *h)
428 if (h->family == FW3_FAMILY_V6)
433 for (chain = ip6tc_first_chain(h->handle);
435 chain = ip6tc_next_chain(h->handle))
437 if (!chain_is_empty(h, chain))
440 fw3_ipt_delete_chain(h, chain);
452 for (chain = iptc_first_chain(h->handle);
454 chain = iptc_next_chain(h->handle))
456 warn("C=%s\n", chain);
458 if (!chain_is_empty(h, chain))
461 warn("D=%s\n", chain);
463 fw3_ipt_delete_chain(h, chain);
472 fw3_ipt_commit(struct fw3_ipt_handle *h)
477 if (h->family == FW3_FAMILY_V6)
479 rv = ip6tc_commit(h->handle);
481 warn("ip6tc_commit(): %s", ip6tc_strerror(errno));
486 rv = iptc_commit(h->handle);
488 warn("iptc_commit(): %s", iptc_strerror(errno));
493 fw3_ipt_close(struct fw3_ipt_handle *h)
498 struct fw3_ipt_rule *
499 fw3_ipt_rule_new(struct fw3_ipt_handle *h)
501 struct fw3_ipt_rule *r;
503 r = fw3_alloc(sizeof(*r));
507 r->argv = fw3_alloc(sizeof(char *));
508 r->argv[r->argc++] = "fw3";
515 is_chain(struct fw3_ipt_handle *h, const char *name)
518 if (h->family == FW3_FAMILY_V6)
519 return ip6tc_is_chain(name, h->handle);
522 return iptc_is_chain(name, h->handle);
526 get_protoname(struct fw3_ipt_rule *r)
528 const struct xtables_pprot *pp;
531 for (pp = xtables_chain_protos; pp->name; pp++)
532 if (pp->num == r->protocol)
533 return (char *)pp->name;
539 load_extension(struct fw3_ipt_handle *h, const char *name)
543 const char *pfx = (h->family == FW3_FAMILY_V6) ? "libip6t" : "libipt";
547 snprintf(path, sizeof(path), "/usr/lib/iptables/libxt_%s.so", name);
548 if (!(lib = dlopen(path, RTLD_NOW)))
550 snprintf(path, sizeof(path), "/usr/lib/iptables/%s_%s.so", pfx, name);
551 lib = dlopen(path, RTLD_NOW);
559 static struct xtables_match *
560 find_match(struct fw3_ipt_rule *r, const char *name)
562 struct xtables_match *m;
564 m = xtables_find_match(name, XTF_DONT_LOAD, &r->matches);
566 if (!m && load_extension(r->h, name))
567 m = xtables_find_match(name, XTF_DONT_LOAD, &r->matches);
573 init_match(struct fw3_ipt_rule *r, struct xtables_match *m, bool no_clone)
576 struct xtables_globals *g;
581 s = XT_ALIGN(sizeof(struct xt_entry_match)) + m->size;
585 fw3_xt_set_match_name(m);
587 m->m->u.user.revision = m->revision;
588 m->m->u.match_size = s;
590 /* free previous userspace data */
591 fw3_xt_free_match_udata(m);
596 /* don't merge options if no_clone is set and this match is a clone */
597 if (no_clone && (m == m->next))
600 /* merge option table */
601 g = (r->h->family == FW3_FAMILY_V6) ? &xtg6 : &xtg;
602 fw3_xt_merge_match_options(g, m);
606 need_protomatch(struct fw3_ipt_rule *r, const char *pname)
611 if (!xtables_find_match(pname, XTF_DONT_LOAD, NULL))
614 return !r->protocol_loaded;
617 static struct xtables_match *
618 load_protomatch(struct fw3_ipt_rule *r)
620 const char *pname = get_protoname(r);
622 if (!need_protomatch(r, pname))
625 return find_match(r, pname);
628 static struct xtables_target *
629 find_target(struct fw3_ipt_rule *r, const char *name)
631 struct xtables_target *t;
633 if (is_chain(r->h, name)) {
634 t = xtables_find_target(XT_STANDARD_TARGET, XTF_DONT_LOAD);
639 load_extension(r->h, "standard");
640 return xtables_find_target(XT_STANDARD_TARGET, XTF_LOAD_MUST_SUCCEED);
643 t = xtables_find_target(name, XTF_DONT_LOAD);
645 if (!t && load_extension(r->h, name))
646 t = xtables_find_target(name, XTF_DONT_LOAD);
651 static struct xtables_target *
652 get_target(struct fw3_ipt_rule *r, const char *name)
655 struct xtables_target *t;
656 struct xtables_globals *g;
658 t = find_target(r, name);
663 s = XT_ALIGN(sizeof(struct xt_entry_target)) + t->size;
666 fw3_xt_set_target_name(t, name);
668 t->t->u.user.revision = t->revision;
669 t->t->u.target_size = s;
671 /* free previous userspace data */
672 fw3_xt_free_target_udata(t);
677 /* merge option table */
678 g = (r->h->family == FW3_FAMILY_V6) ? &xtg6 : &xtg;
679 fw3_xt_merge_target_options(g, t);
687 fw3_ipt_rule_proto(struct fw3_ipt_rule *r, struct fw3_protocol *proto)
691 if (!proto || proto->any)
694 pr = proto->protocol;
697 if (r->h->family == FW3_FAMILY_V6)
702 r->e6.ipv6.proto = pr;
703 r->e6.ipv6.flags |= IP6T_F_PROTO;
706 r->e6.ipv6.invflags |= XT_INV_PROTO;
714 r->e.ip.invflags |= XT_INV_PROTO;
721 fw3_ipt_rule_in_out(struct fw3_ipt_rule *r,
722 struct fw3_device *in, struct fw3_device *out)
725 if (r->h->family == FW3_FAMILY_V6)
729 xtables_parse_interface(in->name, r->e6.ipv6.iniface,
730 r->e6.ipv6.iniface_mask);
733 r->e6.ipv6.invflags |= IP6T_INV_VIA_IN;
736 if (out && !out->any)
738 xtables_parse_interface(out->name, r->e6.ipv6.outiface,
739 r->e6.ipv6.outiface_mask);
742 r->e6.ipv6.invflags |= IP6T_INV_VIA_OUT;
750 xtables_parse_interface(in->name, r->e.ip.iniface,
751 r->e.ip.iniface_mask);
754 r->e.ip.invflags |= IPT_INV_VIA_IN;
757 if (out && !out->any)
759 xtables_parse_interface(out->name, r->e.ip.outiface,
760 r->e.ip.outiface_mask);
763 r->e.ip.invflags |= IPT_INV_VIA_OUT;
770 fw3_ipt_rule_src_dest(struct fw3_ipt_rule *r,
771 struct fw3_address *src, struct fw3_address *dest)
773 if ((src && src->range) || (dest && dest->range))
775 fw3_ipt_rule_addarg(r, false, "-m", "iprange");
782 fw3_ipt_rule_addarg(r, src->invert, "--src-range",
783 fw3_address_to_string(src, false, false));
786 else if (r->h->family == FW3_FAMILY_V6)
788 r->e6.ipv6.src = src->address.v6;
789 r->e6.ipv6.smsk = src->mask.v6;
792 for (i = 0; i < 4; i++)
793 r->e6.ipv6.src.s6_addr32[i] &= r->e6.ipv6.smsk.s6_addr32[i];
796 r->e6.ipv6.invflags |= IP6T_INV_SRCIP;
801 r->e.ip.src = src->address.v4;
802 r->e.ip.smsk = src->mask.v4;
804 r->e.ip.src.s_addr &= r->e.ip.smsk.s_addr;
807 r->e.ip.invflags |= IPT_INV_SRCIP;
811 if (dest && dest->set)
815 fw3_ipt_rule_addarg(r, dest->invert, "--dst-range",
816 fw3_address_to_string(dest, false, false));
819 else if (r->h->family == FW3_FAMILY_V6)
821 r->e6.ipv6.dst = dest->address.v6;
822 r->e6.ipv6.dmsk = dest->mask.v6;
825 for (i = 0; i < 4; i++)
826 r->e6.ipv6.dst.s6_addr32[i] &= r->e6.ipv6.dmsk.s6_addr32[i];
829 r->e6.ipv6.invflags |= IP6T_INV_DSTIP;
834 r->e.ip.dst = dest->address.v4;
835 r->e.ip.dmsk = dest->mask.v4;
837 r->e.ip.dst.s_addr &= r->e.ip.dmsk.s_addr;
840 r->e.ip.invflags |= IPT_INV_DSTIP;
846 fw3_ipt_rule_sport_dport(struct fw3_ipt_rule *r,
847 struct fw3_port *sp, struct fw3_port *dp)
849 char buf[sizeof("65535:65535\0")];
851 if ((!sp || !sp->set) && (!dp || !dp->set))
854 if (!get_protoname(r))
859 if (sp->port_min == sp->port_max)
860 sprintf(buf, "%u", sp->port_min);
862 sprintf(buf, "%u:%u", sp->port_min, sp->port_max);
864 fw3_ipt_rule_addarg(r, sp->invert, "--sport", buf);
869 if (dp->port_min == dp->port_max)
870 sprintf(buf, "%u", dp->port_min);
872 sprintf(buf, "%u:%u", dp->port_min, dp->port_max);
874 fw3_ipt_rule_addarg(r, dp->invert, "--dport", buf);
879 fw3_ipt_rule_device(struct fw3_ipt_rule *r, const char *device, bool out)
882 struct fw3_device dev = { .any = false };
883 strncpy(dev.name, device, sizeof(dev.name) - 1);
884 fw3_ipt_rule_in_out(r, (out) ? NULL : &dev, (out) ? &dev : NULL);
889 fw3_ipt_rule_mac(struct fw3_ipt_rule *r, struct fw3_mac *mac)
891 char buf[sizeof("ff:ff:ff:ff:ff:ff\0")];
892 uint8_t *addr = mac->mac.ether_addr_octet;
897 sprintf(buf, "%02x:%02x:%02x:%02x:%02x:%02x",
898 addr[0], addr[1], addr[2], addr[3], addr[4], addr[5]);
900 fw3_ipt_rule_addarg(r, false, "-m", "mac");
901 fw3_ipt_rule_addarg(r, mac->invert, "--mac-source", buf);
905 fw3_ipt_rule_icmptype(struct fw3_ipt_rule *r, struct fw3_icmptype *icmp)
907 char buf[sizeof("255/255\0")];
913 if (r->h->family == FW3_FAMILY_V6)
915 if (icmp->code6_min == 0 && icmp->code6_max == 0xFF)
916 sprintf(buf, "%u", icmp->type6);
918 sprintf(buf, "%u/%u", icmp->type6, icmp->code6_min);
920 fw3_ipt_rule_addarg(r, icmp->invert, "--icmpv6-type", buf);
925 if (icmp->code_min == 0 && icmp->code_max == 0xFF)
926 sprintf(buf, "%u", icmp->type);
928 sprintf(buf, "%u/%u", icmp->type, icmp->code_min);
930 fw3_ipt_rule_addarg(r, icmp->invert, "--icmp-type", buf);
935 fw3_ipt_rule_limit(struct fw3_ipt_rule *r, struct fw3_limit *limit)
937 char buf[sizeof("-4294967296/second\0")];
939 if (!limit || limit->rate <= 0)
942 fw3_ipt_rule_addarg(r, false, "-m", "limit");
944 sprintf(buf, "%u/%s", limit->rate, fw3_limit_units[limit->unit]);
945 fw3_ipt_rule_addarg(r, limit->invert, "--limit", buf);
947 if (limit->burst > 0)
949 sprintf(buf, "%u", limit->burst);
950 fw3_ipt_rule_addarg(r, limit->invert, "--limit-burst", buf);
955 fw3_ipt_rule_ipset(struct fw3_ipt_rule *r, struct fw3_setmatch *match)
957 char buf[sizeof("dst,dst,dst\0")];
961 struct fw3_ipset *set;
962 struct fw3_ipset_datatype *type;
964 if (!match || !match->set || !match->ptr)
968 list_for_each_entry(type, &set->datatypes, list)
976 p += sprintf(p, "%s", match->dir[i] ? match->dir[i] : type->dir);
980 fw3_ipt_rule_addarg(r, false, "-m", "set");
982 fw3_ipt_rule_addarg(r, match->invert, "--match-set",
983 set->external ? set->external : set->name);
985 fw3_ipt_rule_addarg(r, false, buf, NULL);
989 fw3_ipt_rule_time(struct fw3_ipt_rule *r, struct fw3_time *time)
992 struct tm empty = { 0 };
994 char buf[84]; /* sizeof("1,2,3,...,30,31\0") */
997 bool d1 = memcmp(&time->datestart, &empty, sizeof(empty));
998 bool d2 = memcmp(&time->datestop, &empty, sizeof(empty));
1000 if (!d1 && !d2 && !time->timestart && !time->timestop &&
1001 !(time->monthdays & 0xFFFFFFFE) && !(time->weekdays & 0xFE))
1006 fw3_ipt_rule_addarg(r, false, "-m", "time");
1009 fw3_ipt_rule_addarg(r, false, "--utc", NULL);
1013 strftime(buf, sizeof(buf), "%Y-%m-%dT%H:%M:%S", &time->datestart);
1014 fw3_ipt_rule_addarg(r, false, "--datestart", buf);
1019 strftime(buf, sizeof(buf), "%Y-%m-%dT%H:%M:%S", &time->datestop);
1020 fw3_ipt_rule_addarg(r, false, "--datestop", buf);
1023 if (time->timestart)
1025 sprintf(buf, "%02d:%02d:%02d",
1026 time->timestart / 3600,
1027 time->timestart % 3600 / 60,
1028 time->timestart % 60);
1030 fw3_ipt_rule_addarg(r, false, "--timestart", buf);
1035 sprintf(buf, "%02d:%02d:%02d",
1036 time->timestop / 3600,
1037 time->timestop % 3600 / 60,
1038 time->timestop % 60);
1040 fw3_ipt_rule_addarg(r, false, "--timestop", buf);
1043 if (time->monthdays & 0xFFFFFFFE)
1045 for (i = 1, p = buf; i < 32; i++)
1047 if (fw3_hasbit(time->monthdays, i))
1052 p += sprintf(p, "%u", i);
1056 fw3_ipt_rule_addarg(r, fw3_hasbit(time->monthdays, 0), "--monthdays", buf);
1059 if (time->weekdays & 0xFE)
1061 for (i = 1, p = buf; i < 8; i++)
1063 if (fw3_hasbit(time->weekdays, i))
1068 p += sprintf(p, "%u", i);
1072 fw3_ipt_rule_addarg(r, fw3_hasbit(time->weekdays, 0), "--weekdays", buf);
1077 fw3_ipt_rule_mark(struct fw3_ipt_rule *r, struct fw3_mark *mark)
1079 char buf[sizeof("0xFFFFFFFF/0xFFFFFFFF\0")];
1081 if (!mark || !mark->set)
1084 if (mark->mask < 0xFFFFFFFF)
1085 sprintf(buf, "0x%x/0x%x", mark->mark, mark->mask);
1087 sprintf(buf, "0x%x", mark->mark);
1089 fw3_ipt_rule_addarg(r, false, "-m", "mark");
1090 fw3_ipt_rule_addarg(r, mark->invert, "--mark", buf);
1094 fw3_ipt_rule_comment(struct fw3_ipt_rule *r, const char *fmt, ...)
1103 vsnprintf(buf, sizeof(buf) - 1, fmt, ap);
1106 fw3_ipt_rule_addarg(r, false, "-m", "comment");
1107 fw3_ipt_rule_addarg(r, false, "--comment", buf);
1111 fw3_ipt_rule_extra(struct fw3_ipt_rule *r, const char *extra)
1115 if (!extra || !*extra)
1118 s = fw3_strdup(extra);
1120 for (p = strtok(s, " \t"); p; p = strtok(NULL, " \t"))
1122 tmp = realloc(r->argv, (r->argc + 1) * sizeof(*r->argv));
1128 r->argv[r->argc++] = fw3_strdup(p);
1134 #ifndef DISABLE_IPV6
1136 rule_print6(struct ip6t_entry *e)
1138 char buf1[INET6_ADDRSTRLEN], buf2[INET6_ADDRSTRLEN];
1141 if (e->ipv6.flags & IP6T_F_PROTO)
1143 if (e->ipv6.invflags & XT_INV_PROTO)
1146 pname = get_protoname(container_of(e, struct fw3_ipt_rule, e6));
1149 printf(" -p %s", pname);
1151 printf(" -p %u", e->ipv6.proto);
1154 if (e->ipv6.iniface[0])
1156 if (e->ipv6.invflags & IP6T_INV_VIA_IN)
1159 printf(" -i %s", e->ipv6.iniface);
1162 if (e->ipv6.outiface[0])
1164 if (e->ipv6.invflags & IP6T_INV_VIA_OUT)
1167 printf(" -o %s", e->ipv6.outiface);
1170 if (memcmp(&e->ipv6.src, &in6addr_any, sizeof(struct in6_addr)))
1172 if (e->ipv6.invflags & IP6T_INV_SRCIP)
1176 inet_ntop(AF_INET6, &e->ipv6.src, buf1, sizeof(buf1)),
1177 inet_ntop(AF_INET6, &e->ipv6.smsk, buf2, sizeof(buf2)));
1180 if (memcmp(&e->ipv6.dst, &in6addr_any, sizeof(struct in6_addr)))
1182 if (e->ipv6.invflags & IP6T_INV_DSTIP)
1186 inet_ntop(AF_INET6, &e->ipv6.dst, buf1, sizeof(buf1)),
1187 inet_ntop(AF_INET6, &e->ipv6.dmsk, buf2, sizeof(buf2)));
1193 rule_print4(struct ipt_entry *e)
1195 struct in_addr in_zero = { 0 };
1196 char buf1[sizeof("255.255.255.255\0")], buf2[sizeof("255.255.255.255\0")];
1201 if (e->ip.invflags & XT_INV_PROTO)
1204 pname = get_protoname(container_of(e, struct fw3_ipt_rule, e));
1207 printf(" -p %s", pname);
1209 printf(" -p %u", e->ip.proto);
1212 if (e->ip.iniface[0])
1214 if (e->ip.invflags & IPT_INV_VIA_IN)
1217 printf(" -i %s", e->ip.iniface);
1220 if (e->ip.outiface[0])
1222 if (e->ip.invflags & IPT_INV_VIA_OUT)
1225 printf(" -o %s", e->ip.outiface);
1228 if (memcmp(&e->ip.src, &in_zero, sizeof(struct in_addr)))
1230 if (e->ip.invflags & IPT_INV_SRCIP)
1234 inet_ntop(AF_INET, &e->ip.src, buf1, sizeof(buf1)),
1235 inet_ntop(AF_INET, &e->ip.smsk, buf2, sizeof(buf2)));
1238 if (memcmp(&e->ip.dst, &in_zero, sizeof(struct in_addr)))
1240 if (e->ip.invflags & IPT_INV_DSTIP)
1244 inet_ntop(AF_INET, &e->ip.dst, buf1, sizeof(buf1)),
1245 inet_ntop(AF_INET, &e->ip.dmsk, buf2, sizeof(buf2)));
1250 rule_print(struct fw3_ipt_rule *r, const char *prefix, const char *chain)
1252 debug(r->h, "%s %s", prefix, chain);
1254 #ifndef DISABLE_IPV6
1255 if (r->h->family == FW3_FAMILY_V6)
1256 rule_print6(&r->e6);
1261 fw3_xt_print_matches(&r->e.ip, r->matches);
1262 fw3_xt_print_target(&r->e.ip, r->target);
1268 parse_option(struct fw3_ipt_rule *r, int optc, bool inv)
1270 struct xtables_rule_match *m;
1271 struct xtables_match *em;
1273 /* is a target option */
1274 if (r->target && fw3_xt_has_target_parse(r->target) &&
1275 optc >= r->target->option_offset &&
1276 optc < (r->target->option_offset + 256))
1278 xtables_option_tpcall(optc, r->argv, inv, r->target, &r->e);
1282 /* try to dispatch argument to one of the match parsers */
1283 for (m = r->matches; m; m = m->next)
1287 if (m->completed || !fw3_xt_has_match_parse(em))
1290 if (optc < em->option_offset ||
1291 optc >= (em->option_offset + 256))
1294 xtables_option_mpcall(optc, r->argv, inv, em, &r->e);
1298 /* unhandled option, might belong to a protocol match */
1299 if ((em = load_protomatch(r)) != NULL)
1301 init_match(r, em, false);
1303 r->protocol_loaded = true;
1310 warn("parse_option(): option '%s' needs argument", r->argv[optind-1]);
1313 warn("parse_option(): unknown option '%s'", r->argv[optind-1]);
1319 fw3_ipt_rule_addarg(struct fw3_ipt_rule *r, bool inv,
1320 const char *k, const char *v)
1328 n = inv + !!k + !!v;
1329 tmp = realloc(r->argv, (r->argc + n) * sizeof(*tmp));
1337 r->argv[r->argc++] = fw3_strdup("!");
1339 r->argv[r->argc++] = fw3_strdup(k);
1342 r->argv[r->argc++] = fw3_strdup(v);
1345 static unsigned char *
1346 rule_mask(struct fw3_ipt_rule *r)
1349 unsigned char *p, *mask = NULL;
1350 struct xtables_rule_match *m;
1352 #define SZ(x) XT_ALIGN(sizeof(struct x))
1354 #ifndef DISABLE_IPV6
1355 if (r->h->family == FW3_FAMILY_V6)
1359 for (m = r->matches; m; m = m->next)
1360 s += SZ(ip6t_entry_match) + m->match->size;
1362 s += SZ(ip6t_entry_target);
1364 s += r->target->size;
1366 mask = fw3_alloc(s);
1367 memset(mask, 0xFF, SZ(ip6t_entry));
1368 p = mask + SZ(ip6t_entry);
1370 for (m = r->matches; m; m = m->next)
1372 memset(p, 0xFF, SZ(ip6t_entry_match) + m->match->userspacesize);
1373 p += SZ(ip6t_entry_match) + m->match->size;
1376 memset(p, 0xFF, SZ(ip6t_entry_target) + (r->target) ? r->target->userspacesize : 0);
1383 for (m = r->matches; m; m = m->next)
1384 s += SZ(ipt_entry_match) + m->match->size;
1386 s += SZ(ipt_entry_target);
1388 s += r->target->size;
1390 mask = fw3_alloc(s);
1391 memset(mask, 0xFF, SZ(ipt_entry));
1392 p = mask + SZ(ipt_entry);
1394 for (m = r->matches; m; m = m->next)
1396 memset(p, 0xFF, SZ(ipt_entry_match) + m->match->userspacesize);
1397 p += SZ(ipt_entry_match) + m->match->size;
1400 memset(p, 0xFF, SZ(ipt_entry_target) + (r->target) ? r->target->userspacesize : 0);
1407 rule_build(struct fw3_ipt_rule *r)
1409 size_t s, target_size = (r->target) ? r->target->t->u.target_size : 0;
1410 struct xtables_rule_match *m;
1412 #ifndef DISABLE_IPV6
1413 if (r->h->family == FW3_FAMILY_V6)
1415 struct ip6t_entry *e6;
1417 s = XT_ALIGN(sizeof(struct ip6t_entry));
1419 for (m = r->matches; m; m = m->next)
1420 s += m->match->m->u.match_size;
1422 e6 = fw3_alloc(s + target_size);
1424 memcpy(e6, &r->e6, sizeof(struct ip6t_entry));
1426 e6->target_offset = s;
1427 e6->next_offset = s + target_size;
1431 for (m = r->matches; m; m = m->next)
1433 memcpy(e6->elems + s, m->match->m, m->match->m->u.match_size);
1434 s += m->match->m->u.match_size;
1438 memcpy(e6->elems + s, r->target->t, target_size);
1445 struct ipt_entry *e;
1447 s = XT_ALIGN(sizeof(struct ipt_entry));
1449 for (m = r->matches; m; m = m->next)
1450 s += m->match->m->u.match_size;
1452 e = fw3_alloc(s + target_size);
1454 memcpy(e, &r->e, sizeof(struct ipt_entry));
1456 e->target_offset = s;
1457 e->next_offset = s + target_size;
1461 for (m = r->matches; m; m = m->next)
1463 memcpy(e->elems + s, m->match->m, m->match->m->u.match_size);
1464 s += m->match->m->u.match_size;
1468 memcpy(e->elems + s, r->target->t, target_size);
1475 __fw3_ipt_rule_append(struct fw3_ipt_rule *r, bool repl, const char *fmt, ...)
1478 unsigned char *mask;
1480 struct xtables_rule_match *m;
1481 struct xtables_match *em;
1482 struct xtables_target *et;
1483 struct xtables_globals *g;
1492 vsnprintf(buf, sizeof(buf) - 1, fmt, ap);
1495 g = (r->h->family == FW3_FAMILY_V6) ? &xtg6 : &xtg;
1496 g->opts = g->orig_opts;
1503 em = find_match(r, "id");
1507 warn("fw3_ipt_rule_append(): Can't find match '%s'", "id");
1511 init_match(r, em, true);
1513 id = FW3_ID_MAGIC | (r->id & ~FW3_ID_MASK);
1514 memcpy(em->m->data, &id, sizeof(id));
1519 while ((optc = getopt_long(r->argc, r->argv, "-:m:j:", g->opts,
1525 em = find_match(r, optarg);
1529 warn("fw3_ipt_rule_append(): Can't find match '%s'", optarg);
1533 init_match(r, em, true);
1537 et = get_target(r, optarg);
1541 warn("fw3_ipt_rule_append(): Can't find target '%s'", optarg);
1548 if ((optarg[0] == '!') && (optarg[1] == '\0'))
1555 warn("fw3_ipt_rule_append(): Bad argument '%s'", optarg);
1559 if (parse_option(r, optc, inv))
1567 for (m = r->matches; m; m = m->next)
1568 xtables_option_mfcall(m->match);
1571 xtables_option_tfcall(r->target);
1573 rule = rule_build(r);
1575 #ifndef DISABLE_IPV6
1576 if (r->h->family == FW3_FAMILY_V6)
1580 mask = rule_mask(r);
1582 while (ip6tc_delete_entry(buf, rule, mask, r->h->handle))
1584 rule_print(r, "-D", buf);
1590 rule_print(r, "-A", buf);
1592 if (!ip6tc_append_entry(buf, rule, r->h->handle))
1593 warn("ip6tc_append_entry(): %s", ip6tc_strerror(errno));
1600 mask = rule_mask(r);
1602 while (iptc_delete_entry(buf, rule, mask, r->h->handle))
1604 rule_print(r, "-D", buf);
1610 rule_print(r, "-A", buf);
1612 if (!iptc_append_entry(buf, rule, r->h->handle))
1613 warn("iptc_append_entry(): %s\n", iptc_strerror(errno));
1619 for (i = 1; i < r->argc; i++)
1624 xtables_rule_matches_free(&r->matches);
1631 /* reset all targets and matches */
1632 for (em = xtables_matches; em; em = em->next)
1635 for (et = xtables_targets; et; et = et->next)
1641 xtables_free_opts(1);
1644 struct fw3_ipt_rule *
1645 fw3_ipt_rule_create(struct fw3_ipt_handle *handle, struct fw3_protocol *proto,
1646 struct fw3_device *in, struct fw3_device *out,
1647 struct fw3_address *src, struct fw3_address *dest)
1649 struct fw3_ipt_rule *r;
1651 r = fw3_ipt_rule_new(handle);
1653 fw3_ipt_rule_proto(r, proto);
1654 fw3_ipt_rule_in_out(r, in, out);
1655 fw3_ipt_rule_src_dest(r, src, dest);
1661 xtables_register_match(struct xtables_match *me)
1664 static struct xtables_match **tmp;
1666 if (!xext.register_match)
1667 xext.register_match = dlsym(RTLD_NEXT, "xtables_register_match");
1669 if (!xext.register_match)
1672 xext.register_match(me);
1676 for (i = 0; i < xext.mcount; i++)
1677 if (xext.matches[i] == me)
1680 tmp = realloc(xext.matches, sizeof(me) * (xext.mcount + 1));
1686 xext.matches[xext.mcount++] = me;
1691 xtables_register_target(struct xtables_target *me)
1694 static struct xtables_target **tmp;
1696 if (!xext.register_target)
1697 xext.register_target = dlsym(RTLD_NEXT, "xtables_register_target");
1699 if (!xext.register_target)
1702 xext.register_target(me);
1706 for (i = 0; i < xext.tcount; i++)
1707 if (xext.targets[i] == me)
1710 tmp = realloc(xext.targets, sizeof(me) * (xext.tcount + 1));
1716 xext.targets[xext.tcount++] = me;