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.
19 #define _GNU_SOURCE /* RTLD_NEXT */
21 /* include userspace headers */
26 #include <netinet/in.h>
27 #include <sys/utsname.h>
28 #include <sys/socket.h>
30 /* prevent indirect inclusion of kernel headers */
35 /* prevent libiptc from including kernel headers */
36 #define _FWCHAINS_KERNEL_HEADERS_H
38 /* finally include libiptc and xtables */
39 #include <libiptc/libiptc.h>
40 #include <libiptc/libip6tc.h>
47 /* xtables interface */
48 #if (XTABLES_VERSION_CODE >= 10)
49 # include "xtables-10.h"
50 #elif (XTABLES_VERSION_CODE == 5)
51 # include "xtables-5.h"
53 # error "Unsupported xtables version"
60 struct fw3_ipt_handle *h;
67 struct xtables_rule_match *matches;
68 struct xtables_target *target;
77 static struct option base_opts[] = {
78 { .name = "match", .has_arg = 1, .val = 'm' },
79 { .name = "jump", .has_arg = 1, .val = 'j' },
80 { .name = "in-interface", .has_arg = 1, .val = 'i' },
81 { .name = "out-interface", .has_arg = 1, .val = 'o' },
82 { .name = "source", .has_arg = 1, .val = 's' },
83 { .name = "destination", .has_arg = 1, .val = 'd' },
88 static jmp_buf fw3_ipt_error_jmp;
90 static __attribute__((noreturn))
91 void fw3_ipt_error_handler(enum xtables_exittype status,
96 fprintf(stderr, " ! Exception: ");
99 vfprintf(stderr, fmt, args);
102 longjmp(fw3_ipt_error_jmp, status);
105 static struct xtables_globals xtg = {
107 .program_version = "4",
108 .orig_opts = base_opts,
109 .exit_err = fw3_ipt_error_handler,
110 #if XTABLES_VERSION_CODE > 10
111 .compat_rev = xtables_compatible_revision,
115 static struct xtables_globals xtg6 = {
117 .program_version = "6",
118 .orig_opts = base_opts,
119 .exit_err = fw3_ipt_error_handler,
120 #if XTABLES_VERSION_CODE > 10
121 .compat_rev = xtables_compatible_revision,
128 struct xtables_match **matches;
129 struct xtables_target **targets;
130 void (*register_match)(struct xtables_match *);
131 void (*register_target)(struct xtables_target *);
135 /* Required by certain extensions like SNAT and DNAT */
136 int kernel_version = 0;
139 get_kernel_version(void)
141 static struct utsname uts;
142 int x = 0, y = 0, z = 0;
144 if (uname(&uts) == -1)
145 sprintf(uts.release, "3.0.0");
147 sscanf(uts.release, "%d.%d.%d", &x, &y, &z);
148 kernel_version = 0x10000 * x + 0x100 * y + z;
151 static void fw3_init_extensions(void)
161 struct fw3_ipt_handle *
162 fw3_ipt_open(enum fw3_family family, enum fw3_table table)
165 struct fw3_ipt_handle *h;
167 h = fw3_alloc(sizeof(*h));
171 if (family == FW3_FAMILY_V6)
174 h->family = FW3_FAMILY_V6;
176 h->handle = ip6tc_init(fw3_flag_names[table]);
178 xtables_set_params(&xtg6);
179 xtables_set_nfproto(NFPROTO_IPV6);
184 h->family = FW3_FAMILY_V4;
186 h->handle = iptc_init(fw3_flag_names[table]);
188 xtables_set_params(&xtg);
189 xtables_set_nfproto(NFPROTO_IPV4);
199 fw3_init_extensions();
201 if (xext.register_match)
202 for (i = 0; i < xext.mcount; i++)
203 xext.register_match(xext.matches[i]);
205 if (xext.register_target)
206 for (i = 0; i < xext.tcount; i++)
207 xext.register_target(xext.targets[i]);
213 debug(struct fw3_ipt_handle *h, const char *fmt, ...)
217 printf("%s -t %s ", (h->family == FW3_FAMILY_V6) ? "ip6tables" : "iptables",
218 fw3_flag_names[h->table]);
226 fw3_ipt_set_policy(struct fw3_ipt_handle *h, const char *chain,
227 enum fw3_flag policy)
230 debug(h, "-P %s %s\n", chain, fw3_flag_names[policy]);
233 if (h->family == FW3_FAMILY_V6)
234 ip6tc_set_policy(chain, fw3_flag_names[policy], NULL, h->handle);
237 iptc_set_policy(chain, fw3_flag_names[policy], NULL, h->handle);
241 fw3_ipt_flush_chain(struct fw3_ipt_handle *h, const char *chain)
244 debug(h, "-F %s\n", chain);
247 if (h->family == FW3_FAMILY_V6)
248 ip6tc_flush_entries(chain, h->handle);
251 iptc_flush_entries(chain, h->handle);
255 delete_rules(struct fw3_ipt_handle *h, const char *target)
258 const struct ipt_entry *e;
264 if (h->family == FW3_FAMILY_V6)
266 for (chain = ip6tc_first_chain(h->handle);
268 chain = ip6tc_next_chain(h->handle))
273 const struct ip6t_entry *e6;
274 for (num = 0, e6 = ip6tc_first_rule(chain, h->handle);
276 num++, e6 = ip6tc_next_rule(e6, h->handle))
278 t = ip6tc_get_target(e6, h->handle);
280 if (*t && !strcmp(t, target))
283 debug(h, "-D %s %u\n", chain, num + 1);
285 ip6tc_delete_num_entry(chain, num, h->handle);
296 for (chain = iptc_first_chain(h->handle);
298 chain = iptc_next_chain(h->handle))
303 for (num = 0, e = iptc_first_rule(chain, h->handle);
305 num++, e = iptc_next_rule(e, h->handle))
307 t = iptc_get_target(e, h->handle);
309 if (*t && !strcmp(t, target))
312 debug(h, "-D %s %u\n", chain, num + 1);
314 iptc_delete_num_entry(chain, num, h->handle);
325 fw3_ipt_delete_chain(struct fw3_ipt_handle *h, const char *chain)
327 delete_rules(h, chain);
330 debug(h, "-X %s\n", chain);
333 if (h->family == FW3_FAMILY_V6)
334 ip6tc_delete_chain(chain, h->handle);
337 iptc_delete_chain(chain, h->handle);
341 has_rule_tag(const void *base, unsigned int start, unsigned int end)
344 const struct xt_entry_match *em;
346 for (i = start; i < end; i += em->u.match_size)
350 if (strcmp(em->u.user.name, "comment"))
353 if (!memcmp(em->data, "!fw3", 4))
361 fw3_ipt_delete_id_rules(struct fw3_ipt_handle *h, const char *chain)
364 const struct ipt_entry *e;
368 if (h->family == FW3_FAMILY_V6)
370 if (!ip6tc_is_chain(chain, h->handle))
376 const struct ip6t_entry *e6;
377 for (num = 0, e6 = ip6tc_first_rule(chain, h->handle);
379 num++, e6 = ip6tc_next_rule(e6, h->handle))
381 if (has_rule_tag(e6, sizeof(*e6), e6->target_offset))
384 debug(h, "-D %s %u\n", chain, num + 1);
386 ip6tc_delete_num_entry(chain, num, h->handle);
396 if (!iptc_is_chain(chain, h->handle))
402 for (num = 0, e = iptc_first_rule(chain, h->handle);
404 num++, e = iptc_next_rule(e, h->handle))
406 if (has_rule_tag(e, sizeof(*e), e->target_offset))
409 debug(h, "-D %s %u\n", chain, num + 1);
411 iptc_delete_num_entry(chain, num, h->handle);
421 fw3_ipt_create_chain(struct fw3_ipt_handle *h, const char *fmt, ...)
427 vsnprintf(buf, sizeof(buf) - 1, fmt, ap);
431 debug(h, "-N %s\n", buf);
433 iptc_create_chain(buf, h->handle);
437 fw3_ipt_flush(struct fw3_ipt_handle *h)
442 if (h->family == FW3_FAMILY_V6)
444 for (chain = ip6tc_first_chain(h->handle);
446 chain = ip6tc_next_chain(h->handle))
448 ip6tc_flush_entries(chain, h->handle);
451 for (chain = ip6tc_first_chain(h->handle);
453 chain = ip6tc_next_chain(h->handle))
455 ip6tc_delete_chain(chain, h->handle);
461 for (chain = iptc_first_chain(h->handle);
463 chain = iptc_next_chain(h->handle))
465 iptc_flush_entries(chain, h->handle);
468 for (chain = iptc_first_chain(h->handle);
470 chain = iptc_next_chain(h->handle))
472 iptc_delete_chain(chain, h->handle);
478 chain_is_empty(struct fw3_ipt_handle *h, const char *chain)
481 if (h->family == FW3_FAMILY_V6)
482 return (!ip6tc_builtin(chain, h->handle) &&
483 !ip6tc_first_rule(chain, h->handle));
486 return (!iptc_builtin(chain, h->handle) &&
487 !iptc_first_rule(chain, h->handle));
491 fw3_ipt_gc(struct fw3_ipt_handle *h)
497 if (h->family == FW3_FAMILY_V6)
502 for (chain = ip6tc_first_chain(h->handle);
504 chain = ip6tc_next_chain(h->handle))
506 if (!chain_is_empty(h, chain))
509 fw3_ipt_delete_chain(h, chain);
521 for (chain = iptc_first_chain(h->handle);
523 chain = iptc_next_chain(h->handle))
525 warn("C=%s\n", chain);
527 if (!chain_is_empty(h, chain))
530 warn("D=%s\n", chain);
532 fw3_ipt_delete_chain(h, chain);
541 fw3_ipt_commit(struct fw3_ipt_handle *h)
546 if (h->family == FW3_FAMILY_V6)
548 rv = ip6tc_commit(h->handle);
550 warn("ip6tc_commit(): %s", ip6tc_strerror(errno));
555 rv = iptc_commit(h->handle);
557 warn("iptc_commit(): %s", iptc_strerror(errno));
562 fw3_ipt_close(struct fw3_ipt_handle *h)
567 struct fw3_ipt_rule *
568 fw3_ipt_rule_new(struct fw3_ipt_handle *h)
570 struct fw3_ipt_rule *r;
572 r = fw3_alloc(sizeof(*r));
575 r->argv = fw3_alloc(sizeof(char *));
576 r->argv[r->argc++] = "fw3";
583 is_chain(struct fw3_ipt_handle *h, const char *name)
586 if (h->family == FW3_FAMILY_V6)
587 return ip6tc_is_chain(name, h->handle);
590 return iptc_is_chain(name, h->handle);
594 get_protoname(struct fw3_ipt_rule *r)
596 const struct xtables_pprot *pp;
599 for (pp = xtables_chain_protos; pp->name; pp++)
600 if (pp->num == r->protocol)
601 return (char *)pp->name;
606 static struct xtables_match *
607 find_match(struct fw3_ipt_rule *r, const char *name)
609 struct xtables_match *m;
612 m = xtables_find_match(name, XTF_TRY_LOAD, &r->matches);
619 init_match(struct fw3_ipt_rule *r, struct xtables_match *m, bool no_clone)
622 struct xtables_globals *g;
627 s = XT_ALIGN(sizeof(struct xt_entry_match)) + m->size;
631 fw3_xt_set_match_name(m);
633 m->m->u.user.revision = m->revision;
634 m->m->u.match_size = s;
636 /* free previous userspace data */
637 fw3_xt_free_match_udata(m);
642 /* don't merge options if no_clone is set and this match is a clone */
643 if (no_clone && (m == m->next))
646 /* merge option table */
647 g = (r->h->family == FW3_FAMILY_V6) ? &xtg6 : &xtg;
648 fw3_xt_merge_match_options(g, m);
652 need_protomatch(struct fw3_ipt_rule *r, const char *pname)
657 if (!xtables_find_match(pname, XTF_DONT_LOAD, NULL))
660 return !r->protocol_loaded;
663 static struct xtables_match *
664 load_protomatch(struct fw3_ipt_rule *r)
666 const char *pname = get_protoname(r);
668 if (!need_protomatch(r, pname))
671 return find_match(r, pname);
674 static struct xtables_target *
675 find_target(struct fw3_ipt_rule *r, const char *name)
677 struct xtables_target *t;
681 if (is_chain(r->h, name))
682 t = xtables_find_target(XT_STANDARD_TARGET, XTF_TRY_LOAD);
684 t = xtables_find_target(name, XTF_TRY_LOAD);
691 static struct xtables_target *
692 get_target(struct fw3_ipt_rule *r, const char *name)
695 struct xtables_target *t;
696 struct xtables_globals *g;
698 t = find_target(r, name);
703 s = XT_ALIGN(sizeof(struct xt_entry_target)) + t->size;
706 fw3_xt_set_target_name(t, name);
708 t->t->u.user.revision = t->revision;
709 t->t->u.target_size = s;
711 /* free previous userspace data */
712 fw3_xt_free_target_udata(t);
717 /* merge option table */
718 g = (r->h->family == FW3_FAMILY_V6) ? &xtg6 : &xtg;
719 fw3_xt_merge_target_options(g, t);
727 fw3_ipt_rule_proto(struct fw3_ipt_rule *r, struct fw3_protocol *proto)
731 if (!proto || proto->any)
734 pr = proto->protocol;
737 if (r->h->family == FW3_FAMILY_V6)
742 r->e6.ipv6.proto = pr;
743 r->e6.ipv6.flags |= IP6T_F_PROTO;
746 r->e6.ipv6.invflags |= XT_INV_PROTO;
754 r->e.ip.invflags |= XT_INV_PROTO;
761 fw3_ipt_rule_in_out(struct fw3_ipt_rule *r,
762 struct fw3_device *in, struct fw3_device *out)
765 if (r->h->family == FW3_FAMILY_V6)
769 xtables_parse_interface(in->name, r->e6.ipv6.iniface,
770 r->e6.ipv6.iniface_mask);
773 r->e6.ipv6.invflags |= IP6T_INV_VIA_IN;
776 if (out && !out->any)
778 xtables_parse_interface(out->name, r->e6.ipv6.outiface,
779 r->e6.ipv6.outiface_mask);
782 r->e6.ipv6.invflags |= IP6T_INV_VIA_OUT;
790 xtables_parse_interface(in->name, r->e.ip.iniface,
791 r->e.ip.iniface_mask);
794 r->e.ip.invflags |= IPT_INV_VIA_IN;
797 if (out && !out->any)
799 xtables_parse_interface(out->name, r->e.ip.outiface,
800 r->e.ip.outiface_mask);
803 r->e.ip.invflags |= IPT_INV_VIA_OUT;
810 fw3_ipt_rule_src_dest(struct fw3_ipt_rule *r,
811 struct fw3_address *src, struct fw3_address *dest)
813 if ((src && src->range) || (dest && dest->range))
815 fw3_ipt_rule_addarg(r, false, "-m", "iprange");
822 fw3_ipt_rule_addarg(r, src->invert, "--src-range",
823 fw3_address_to_string(src, false, false));
826 else if (r->h->family == FW3_FAMILY_V6)
828 r->e6.ipv6.src = src->address.v6;
829 r->e6.ipv6.smsk = src->mask.v6;
832 for (i = 0; i < 4; i++)
833 r->e6.ipv6.src.s6_addr32[i] &= r->e6.ipv6.smsk.s6_addr32[i];
836 r->e6.ipv6.invflags |= IP6T_INV_SRCIP;
841 r->e.ip.src = src->address.v4;
842 r->e.ip.smsk = src->mask.v4;
844 r->e.ip.src.s_addr &= r->e.ip.smsk.s_addr;
847 r->e.ip.invflags |= IPT_INV_SRCIP;
851 if (dest && dest->set)
855 fw3_ipt_rule_addarg(r, dest->invert, "--dst-range",
856 fw3_address_to_string(dest, false, false));
859 else if (r->h->family == FW3_FAMILY_V6)
861 r->e6.ipv6.dst = dest->address.v6;
862 r->e6.ipv6.dmsk = dest->mask.v6;
865 for (i = 0; i < 4; i++)
866 r->e6.ipv6.dst.s6_addr32[i] &= r->e6.ipv6.dmsk.s6_addr32[i];
869 r->e6.ipv6.invflags |= IP6T_INV_DSTIP;
874 r->e.ip.dst = dest->address.v4;
875 r->e.ip.dmsk = dest->mask.v4;
877 r->e.ip.dst.s_addr &= r->e.ip.dmsk.s_addr;
880 r->e.ip.invflags |= IPT_INV_DSTIP;
886 fw3_ipt_rule_sport_dport(struct fw3_ipt_rule *r,
887 struct fw3_port *sp, struct fw3_port *dp)
889 char buf[sizeof("65535:65535\0")];
891 if ((!sp || !sp->set) && (!dp || !dp->set))
894 if (!get_protoname(r))
899 if (sp->port_min == sp->port_max)
900 sprintf(buf, "%u", sp->port_min);
902 sprintf(buf, "%u:%u", sp->port_min, sp->port_max);
904 fw3_ipt_rule_addarg(r, sp->invert, "--sport", buf);
909 if (dp->port_min == dp->port_max)
910 sprintf(buf, "%u", dp->port_min);
912 sprintf(buf, "%u:%u", dp->port_min, dp->port_max);
914 fw3_ipt_rule_addarg(r, dp->invert, "--dport", buf);
919 fw3_ipt_rule_device(struct fw3_ipt_rule *r, const char *device, bool out)
922 struct fw3_device dev = { .any = false };
923 strncpy(dev.name, device, sizeof(dev.name) - 1);
924 fw3_ipt_rule_in_out(r, (out) ? NULL : &dev, (out) ? &dev : NULL);
929 fw3_ipt_rule_mac(struct fw3_ipt_rule *r, struct fw3_mac *mac)
931 char buf[sizeof("ff:ff:ff:ff:ff:ff\0")];
932 uint8_t *addr = mac->mac.ether_addr_octet;
937 sprintf(buf, "%02x:%02x:%02x:%02x:%02x:%02x",
938 addr[0], addr[1], addr[2], addr[3], addr[4], addr[5]);
940 fw3_ipt_rule_addarg(r, false, "-m", "mac");
941 fw3_ipt_rule_addarg(r, mac->invert, "--mac-source", buf);
945 fw3_ipt_rule_icmptype(struct fw3_ipt_rule *r, struct fw3_icmptype *icmp)
947 char buf[sizeof("255/255\0")];
953 if (r->h->family == FW3_FAMILY_V6)
955 if (icmp->code6_min == 0 && icmp->code6_max == 0xFF)
956 sprintf(buf, "%u", icmp->type6);
958 sprintf(buf, "%u/%u", icmp->type6, icmp->code6_min);
960 fw3_ipt_rule_addarg(r, icmp->invert, "--icmpv6-type", buf);
965 if (icmp->code_min == 0 && icmp->code_max == 0xFF)
966 sprintf(buf, "%u", icmp->type);
968 sprintf(buf, "%u/%u", icmp->type, icmp->code_min);
970 fw3_ipt_rule_addarg(r, icmp->invert, "--icmp-type", buf);
975 fw3_ipt_rule_limit(struct fw3_ipt_rule *r, struct fw3_limit *limit)
977 char buf[sizeof("-4294967296/second\0")];
979 if (!limit || limit->rate <= 0)
982 fw3_ipt_rule_addarg(r, false, "-m", "limit");
984 sprintf(buf, "%u/%s", limit->rate, fw3_limit_units[limit->unit]);
985 fw3_ipt_rule_addarg(r, limit->invert, "--limit", buf);
987 if (limit->burst > 0)
989 sprintf(buf, "%u", limit->burst);
990 fw3_ipt_rule_addarg(r, limit->invert, "--limit-burst", buf);
995 fw3_ipt_rule_ipset(struct fw3_ipt_rule *r, struct fw3_setmatch *match)
997 char buf[sizeof("dst,dst,dst\0")];
1001 struct fw3_ipset *set;
1002 struct fw3_ipset_datatype *type;
1004 if (!match || !match->set || !match->ptr)
1008 list_for_each_entry(type, &set->datatypes, list)
1016 p += sprintf(p, "%s", match->dir[i] ? match->dir[i] : type->dir);
1020 fw3_ipt_rule_addarg(r, false, "-m", "set");
1022 fw3_ipt_rule_addarg(r, match->invert, "--match-set",
1023 set->external ? set->external : set->name);
1025 fw3_ipt_rule_addarg(r, false, buf, NULL);
1029 fw3_ipt_rule_helper(struct fw3_ipt_rule *r, struct fw3_cthelpermatch *match)
1031 if (!match || !match->set || !match->ptr)
1034 fw3_ipt_rule_addarg(r, false, "-m", "helper");
1035 fw3_ipt_rule_addarg(r, match->invert, "--helper", match->ptr->name);
1039 fw3_ipt_rule_time(struct fw3_ipt_rule *r, struct fw3_time *time)
1042 struct tm empty = { 0 };
1044 char buf[84]; /* sizeof("1,2,3,...,30,31\0") */
1047 bool d1 = memcmp(&time->datestart, &empty, sizeof(empty));
1048 bool d2 = memcmp(&time->datestop, &empty, sizeof(empty));
1050 if (!d1 && !d2 && !time->timestart && !time->timestop &&
1051 !(time->monthdays & 0xFFFFFFFE) && !(time->weekdays & 0xFE))
1056 fw3_ipt_rule_addarg(r, false, "-m", "time");
1059 fw3_ipt_rule_addarg(r, false, "--kerneltz", NULL);
1063 strftime(buf, sizeof(buf), "%Y-%m-%dT%H:%M:%S", &time->datestart);
1064 fw3_ipt_rule_addarg(r, false, "--datestart", buf);
1069 strftime(buf, sizeof(buf), "%Y-%m-%dT%H:%M:%S", &time->datestop);
1070 fw3_ipt_rule_addarg(r, false, "--datestop", buf);
1073 if (time->timestart)
1075 sprintf(buf, "%02d:%02d:%02d",
1076 time->timestart / 3600,
1077 time->timestart % 3600 / 60,
1078 time->timestart % 60);
1080 fw3_ipt_rule_addarg(r, false, "--timestart", buf);
1085 sprintf(buf, "%02d:%02d:%02d",
1086 time->timestop / 3600,
1087 time->timestop % 3600 / 60,
1088 time->timestop % 60);
1090 fw3_ipt_rule_addarg(r, false, "--timestop", buf);
1093 if (time->monthdays & 0xFFFFFFFE)
1095 for (i = 1, p = buf; i < 32; i++)
1097 if (fw3_hasbit(time->monthdays, i))
1102 p += sprintf(p, "%u", i);
1106 fw3_ipt_rule_addarg(r, fw3_hasbit(time->monthdays, 0), "--monthdays", buf);
1109 if (time->weekdays & 0xFE)
1111 for (i = 1, p = buf; i < 8; i++)
1113 if (fw3_hasbit(time->weekdays, i))
1118 p += sprintf(p, "%u", i);
1122 fw3_ipt_rule_addarg(r, fw3_hasbit(time->weekdays, 0), "--weekdays", buf);
1127 fw3_ipt_rule_mark(struct fw3_ipt_rule *r, struct fw3_mark *mark)
1129 char buf[sizeof("0xFFFFFFFF/0xFFFFFFFF\0")];
1131 if (!mark || !mark->set)
1134 if (mark->mask < 0xFFFFFFFF)
1135 sprintf(buf, "0x%x/0x%x", mark->mark, mark->mask);
1137 sprintf(buf, "0x%x", mark->mark);
1139 fw3_ipt_rule_addarg(r, false, "-m", "mark");
1140 fw3_ipt_rule_addarg(r, mark->invert, "--mark", buf);
1144 fw3_ipt_rule_comment(struct fw3_ipt_rule *r, const char *fmt, ...)
1153 vsnprintf(buf, sizeof(buf) - 1, fmt, ap);
1156 fw3_ipt_rule_addarg(r, false, "-m", "comment");
1157 fw3_ipt_rule_addarg(r, false, "--comment", buf);
1161 fw3_ipt_rule_extra(struct fw3_ipt_rule *r, const char *extra)
1165 if (!extra || !*extra)
1168 s = fw3_strdup(extra);
1170 for (p = strtok(s, " \t"); p; p = strtok(NULL, " \t"))
1172 tmp = realloc(r->argv, (r->argc + 1) * sizeof(*r->argv));
1178 r->argv[r->argc++] = fw3_strdup(p);
1184 #ifndef DISABLE_IPV6
1186 rule_print6(struct ip6t_entry *e)
1188 char buf1[INET6_ADDRSTRLEN], buf2[INET6_ADDRSTRLEN];
1191 if (e->ipv6.flags & IP6T_F_PROTO)
1193 if (e->ipv6.invflags & XT_INV_PROTO)
1196 pname = get_protoname(container_of(e, struct fw3_ipt_rule, e6));
1199 printf(" -p %s", pname);
1201 printf(" -p %u", e->ipv6.proto);
1204 if (e->ipv6.iniface[0])
1206 if (e->ipv6.invflags & IP6T_INV_VIA_IN)
1209 printf(" -i %s", e->ipv6.iniface);
1212 if (e->ipv6.outiface[0])
1214 if (e->ipv6.invflags & IP6T_INV_VIA_OUT)
1217 printf(" -o %s", e->ipv6.outiface);
1220 if (memcmp(&e->ipv6.src, &in6addr_any, sizeof(struct in6_addr)))
1222 if (e->ipv6.invflags & IP6T_INV_SRCIP)
1226 inet_ntop(AF_INET6, &e->ipv6.src, buf1, sizeof(buf1)),
1227 inet_ntop(AF_INET6, &e->ipv6.smsk, buf2, sizeof(buf2)));
1230 if (memcmp(&e->ipv6.dst, &in6addr_any, sizeof(struct in6_addr)))
1232 if (e->ipv6.invflags & IP6T_INV_DSTIP)
1236 inet_ntop(AF_INET6, &e->ipv6.dst, buf1, sizeof(buf1)),
1237 inet_ntop(AF_INET6, &e->ipv6.dmsk, buf2, sizeof(buf2)));
1243 rule_print4(struct ipt_entry *e)
1245 struct in_addr in_zero = { 0 };
1246 char buf1[sizeof("255.255.255.255\0")], buf2[sizeof("255.255.255.255\0")];
1251 if (e->ip.invflags & XT_INV_PROTO)
1254 pname = get_protoname(container_of(e, struct fw3_ipt_rule, e));
1257 printf(" -p %s", pname);
1259 printf(" -p %u", e->ip.proto);
1262 if (e->ip.iniface[0])
1264 if (e->ip.invflags & IPT_INV_VIA_IN)
1267 printf(" -i %s", e->ip.iniface);
1270 if (e->ip.outiface[0])
1272 if (e->ip.invflags & IPT_INV_VIA_OUT)
1275 printf(" -o %s", e->ip.outiface);
1278 if (memcmp(&e->ip.src, &in_zero, sizeof(struct in_addr)))
1280 if (e->ip.invflags & IPT_INV_SRCIP)
1284 inet_ntop(AF_INET, &e->ip.src, buf1, sizeof(buf1)),
1285 inet_ntop(AF_INET, &e->ip.smsk, buf2, sizeof(buf2)));
1288 if (memcmp(&e->ip.dst, &in_zero, sizeof(struct in_addr)))
1290 if (e->ip.invflags & IPT_INV_DSTIP)
1294 inet_ntop(AF_INET, &e->ip.dst, buf1, sizeof(buf1)),
1295 inet_ntop(AF_INET, &e->ip.dmsk, buf2, sizeof(buf2)));
1300 rule_print(struct fw3_ipt_rule *r, const char *prefix, const char *chain)
1302 debug(r->h, "%s %s", prefix, chain);
1304 #ifndef DISABLE_IPV6
1305 if (r->h->family == FW3_FAMILY_V6)
1306 rule_print6(&r->e6);
1311 fw3_xt_print_matches(&r->e.ip, r->matches);
1312 fw3_xt_print_target(&r->e.ip, r->target);
1318 parse_option(struct fw3_ipt_rule *r, int optc, bool inv)
1320 struct xtables_rule_match *m;
1321 struct xtables_match *em;
1323 /* is a target option */
1324 if (r->target && fw3_xt_has_target_parse(r->target) &&
1325 optc >= r->target->option_offset &&
1326 optc < (r->target->option_offset + 256))
1328 xtables_option_tpcall(optc, r->argv, inv, r->target, &r->e);
1332 /* try to dispatch argument to one of the match parsers */
1333 for (m = r->matches; m; m = m->next)
1337 if (m->completed || !fw3_xt_has_match_parse(em))
1340 if (optc < em->option_offset ||
1341 optc >= (em->option_offset + 256))
1344 xtables_option_mpcall(optc, r->argv, inv, em, &r->e);
1348 /* unhandled option, might belong to a protocol match */
1349 if ((em = load_protomatch(r)) != NULL)
1351 init_match(r, em, false);
1353 r->protocol_loaded = true;
1360 warn("parse_option(): option '%s' needs argument", r->argv[optind-1]);
1363 warn("parse_option(): unknown option '%s'", r->argv[optind-1]);
1369 fw3_ipt_rule_addarg(struct fw3_ipt_rule *r, bool inv,
1370 const char *k, const char *v)
1378 n = inv + !!k + !!v;
1379 tmp = realloc(r->argv, (r->argc + n) * sizeof(*tmp));
1387 r->argv[r->argc++] = fw3_strdup("!");
1389 r->argv[r->argc++] = fw3_strdup(k);
1392 r->argv[r->argc++] = fw3_strdup(v);
1395 static unsigned char *
1396 rule_mask(struct fw3_ipt_rule *r)
1399 unsigned char *p, *mask = NULL;
1400 struct xtables_rule_match *m;
1402 #define SZ(x) XT_ALIGN(sizeof(struct x))
1404 #ifndef DISABLE_IPV6
1405 if (r->h->family == FW3_FAMILY_V6)
1409 for (m = r->matches; m; m = m->next)
1410 s += SZ(ip6t_entry_match) + m->match->size;
1412 s += SZ(ip6t_entry_target);
1414 s += r->target->size;
1416 mask = fw3_alloc(s);
1417 memset(mask, 0xFF, SZ(ip6t_entry));
1418 p = mask + SZ(ip6t_entry);
1420 for (m = r->matches; m; m = m->next)
1422 memset(p, 0xFF, SZ(ip6t_entry_match) + m->match->userspacesize);
1423 p += SZ(ip6t_entry_match) + m->match->size;
1426 memset(p, 0xFF, SZ(ip6t_entry_target) + (r->target ? r->target->userspacesize : 0));
1433 for (m = r->matches; m; m = m->next)
1434 s += SZ(ipt_entry_match) + m->match->size;
1436 s += SZ(ipt_entry_target);
1438 s += r->target->size;
1440 mask = fw3_alloc(s);
1441 memset(mask, 0xFF, SZ(ipt_entry));
1442 p = mask + SZ(ipt_entry);
1444 for (m = r->matches; m; m = m->next)
1446 memset(p, 0xFF, SZ(ipt_entry_match) + m->match->userspacesize);
1447 p += SZ(ipt_entry_match) + m->match->size;
1450 memset(p, 0xFF, SZ(ipt_entry_target) + (r->target ? r->target->userspacesize : 0));
1457 rule_build(struct fw3_ipt_rule *r)
1459 size_t s, target_size = (r->target) ? r->target->t->u.target_size : 0;
1460 struct xtables_rule_match *m;
1462 #ifndef DISABLE_IPV6
1463 if (r->h->family == FW3_FAMILY_V6)
1465 struct ip6t_entry *e6;
1467 s = XT_ALIGN(sizeof(struct ip6t_entry));
1469 for (m = r->matches; m; m = m->next)
1470 s += m->match->m->u.match_size;
1472 e6 = fw3_alloc(s + target_size);
1474 memcpy(e6, &r->e6, sizeof(struct ip6t_entry));
1476 e6->target_offset = s;
1477 e6->next_offset = s + target_size;
1481 for (m = r->matches; m; m = m->next)
1483 memcpy(e6->elems + s, m->match->m, m->match->m->u.match_size);
1484 s += m->match->m->u.match_size;
1488 memcpy(e6->elems + s, r->target->t, target_size);
1495 struct ipt_entry *e;
1497 s = XT_ALIGN(sizeof(struct ipt_entry));
1499 for (m = r->matches; m; m = m->next)
1500 s += m->match->m->u.match_size;
1502 e = fw3_alloc(s + target_size);
1504 memcpy(e, &r->e, sizeof(struct ipt_entry));
1506 e->target_offset = s;
1507 e->next_offset = s + target_size;
1511 for (m = r->matches; m; m = m->next)
1513 memcpy(e->elems + s, m->match->m, m->match->m->u.match_size);
1514 s += m->match->m->u.match_size;
1518 memcpy(e->elems + s, r->target->t, target_size);
1525 set_rule_tag(struct fw3_ipt_rule *r)
1529 const char *tag = "!fw3";
1531 for (i = 0; i < r->argc; i++)
1532 if (!strcmp(r->argv[i], "--comment") && (i + 1) < r->argc)
1533 if (asprintf(&p, "%s: %s", tag, r->argv[i + 1]) > 0)
1535 free(r->argv[i + 1]);
1540 tmp = realloc(r->argv, (r->argc + 4) * sizeof(*r->argv));
1545 r->argv[r->argc++] = fw3_strdup("-m");
1546 r->argv[r->argc++] = fw3_strdup("comment");
1547 r->argv[r->argc++] = fw3_strdup("--comment");
1548 r->argv[r->argc++] = fw3_strdup(tag);
1553 __fw3_ipt_rule_append(struct fw3_ipt_rule *r, bool repl, const char *fmt, ...)
1556 unsigned char *mask;
1558 struct xtables_rule_match *m;
1559 struct xtables_match *em;
1560 struct xtables_target *et;
1561 struct xtables_globals *g;
1563 struct fw3_device dev;
1564 struct fw3_address addr;
1566 enum xtables_exittype status;
1574 vsnprintf(buf, sizeof(buf) - 1, fmt, ap);
1577 g = (r->h->family == FW3_FAMILY_V6) ? &xtg6 : &xtg;
1578 g->opts = g->orig_opts;
1583 status = setjmp(fw3_ipt_error_jmp);
1587 info(" ! Skipping due to previous exception (code %u)", status);
1593 while ((optc = getopt_long(r->argc, r->argv, "-:m:j:i:o:s:d:", g->opts,
1599 em = find_match(r, optarg);
1603 warn("fw3_ipt_rule_append(): Can't find match '%s'", optarg);
1607 init_match(r, em, true);
1611 et = get_target(r, optarg);
1615 warn("fw3_ipt_rule_append(): Can't find target '%s'", optarg);
1623 if (!fw3_parse_device(&dev, optarg, false) ||
1624 dev.any || dev.invert || *dev.network)
1626 warn("fw3_ipt_rule_append(): Bad argument '%s'", optarg);
1631 fw3_ipt_rule_in_out(r, (optc == 'i') ? &dev : NULL,
1632 (optc == 'o') ? &dev : NULL);
1637 if (!fw3_parse_address(&addr, optarg, false) ||
1638 addr.range || addr.invert)
1640 warn("fw3_ipt_rule_append(): Bad argument '%s'", optarg);
1645 fw3_ipt_rule_src_dest(r, (optc == 's') ? &addr : NULL,
1646 (optc == 'd') ? &addr : NULL);
1650 if ((optarg[0] == '!') && (optarg[1] == '\0'))
1657 warn("fw3_ipt_rule_append(): Bad argument '%s'", optarg);
1661 if (parse_option(r, optc, inv))
1669 for (m = r->matches; m; m = m->next)
1670 xtables_option_mfcall(m->match);
1673 xtables_option_tfcall(r->target);
1675 rule = rule_build(r);
1677 #ifndef DISABLE_IPV6
1678 if (r->h->family == FW3_FAMILY_V6)
1682 mask = rule_mask(r);
1684 while (ip6tc_delete_entry(buf, rule, mask, r->h->handle))
1686 rule_print(r, "-D", buf);
1692 rule_print(r, "-A", buf);
1694 if (!ip6tc_append_entry(buf, rule, r->h->handle))
1695 warn("ip6tc_append_entry(): %s", ip6tc_strerror(errno));
1702 mask = rule_mask(r);
1704 while (iptc_delete_entry(buf, rule, mask, r->h->handle))
1706 rule_print(r, "-D", buf);
1712 rule_print(r, "-A", buf);
1714 if (!iptc_append_entry(buf, rule, r->h->handle))
1715 warn("iptc_append_entry(): %s\n", iptc_strerror(errno));
1721 for (i = 1; i < r->argc; i++)
1726 xtables_rule_matches_free(&r->matches);
1733 /* reset all targets and matches */
1734 for (em = xtables_matches; em; em = em->next)
1737 for (et = xtables_targets; et; et = et->next)
1743 xtables_free_opts(1);
1746 struct fw3_ipt_rule *
1747 fw3_ipt_rule_create(struct fw3_ipt_handle *handle, struct fw3_protocol *proto,
1748 struct fw3_device *in, struct fw3_device *out,
1749 struct fw3_address *src, struct fw3_address *dest)
1751 struct fw3_ipt_rule *r;
1753 r = fw3_ipt_rule_new(handle);
1755 fw3_ipt_rule_proto(r, proto);
1756 fw3_ipt_rule_in_out(r, in, out);
1757 fw3_ipt_rule_src_dest(r, src, dest);
1763 xtables_register_match(struct xtables_match *me)
1766 static struct xtables_match **tmp;
1768 if (!xext.register_match)
1769 xext.register_match = dlsym(RTLD_NEXT, "xtables_register_match");
1771 if (!xext.register_match)
1774 xext.register_match(me);
1778 for (i = 0; i < xext.mcount; i++)
1779 if (xext.matches[i] == me)
1782 tmp = realloc(xext.matches, sizeof(me) * (xext.mcount + 1));
1788 xext.matches[xext.mcount++] = me;
1793 xtables_register_target(struct xtables_target *me)
1796 static struct xtables_target **tmp;
1798 if (!xext.register_target)
1799 xext.register_target = dlsym(RTLD_NEXT, "xtables_register_target");
1801 if (!xext.register_target)
1804 xext.register_target(me);
1808 for (i = 0; i < xext.tcount; i++)
1809 if (xext.targets[i] == me)
1812 tmp = realloc(xext.targets, sizeof(me) * (xext.tcount + 1));
1818 xext.targets[xext.tcount++] = me;