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' },
84 static jmp_buf fw3_ipt_error_jmp;
86 static __attribute__((noreturn))
87 void fw3_ipt_error_handler(enum xtables_exittype status,
92 fprintf(stderr, " ! Exception: ");
95 vfprintf(stderr, fmt, args);
98 longjmp(fw3_ipt_error_jmp, status);
101 static struct xtables_globals xtg = {
103 .program_version = "4",
104 .orig_opts = base_opts,
105 .exit_err = fw3_ipt_error_handler,
106 #if XTABLES_VERSION_CODE > 10
107 .compat_rev = xtables_compatible_revision,
111 static struct xtables_globals xtg6 = {
113 .program_version = "6",
114 .orig_opts = base_opts,
115 .exit_err = fw3_ipt_error_handler,
116 #if XTABLES_VERSION_CODE > 10
117 .compat_rev = xtables_compatible_revision,
124 struct xtables_match **matches;
125 struct xtables_target **targets;
126 void (*register_match)(struct xtables_match *);
127 void (*register_target)(struct xtables_target *);
131 /* Required by certain extensions like SNAT and DNAT */
132 int kernel_version = 0;
135 get_kernel_version(void)
137 static struct utsname uts;
138 int x = 0, y = 0, z = 0;
140 if (uname(&uts) == -1)
141 sprintf(uts.release, "3.0.0");
143 sscanf(uts.release, "%d.%d.%d", &x, &y, &z);
144 kernel_version = 0x10000 * x + 0x100 * y + z;
147 static void fw3_init_extensions(void)
157 struct fw3_ipt_handle *
158 fw3_ipt_open(enum fw3_family family, enum fw3_table table)
161 struct fw3_ipt_handle *h;
163 h = fw3_alloc(sizeof(*h));
167 if (family == FW3_FAMILY_V6)
170 h->family = FW3_FAMILY_V6;
172 h->handle = ip6tc_init(fw3_flag_names[table]);
174 xtables_set_params(&xtg6);
175 xtables_set_nfproto(NFPROTO_IPV6);
180 h->family = FW3_FAMILY_V4;
182 h->handle = iptc_init(fw3_flag_names[table]);
184 xtables_set_params(&xtg);
185 xtables_set_nfproto(NFPROTO_IPV4);
195 fw3_init_extensions();
197 if (xext.register_match)
198 for (i = 0; i < xext.mcount; i++)
199 xext.register_match(xext.matches[i]);
201 if (xext.register_target)
202 for (i = 0; i < xext.tcount; i++)
203 xext.register_target(xext.targets[i]);
209 debug(struct fw3_ipt_handle *h, const char *fmt, ...)
213 printf("%s -t %s ", (h->family == FW3_FAMILY_V6) ? "ip6tables" : "iptables",
214 fw3_flag_names[h->table]);
222 fw3_ipt_set_policy(struct fw3_ipt_handle *h, const char *chain,
223 enum fw3_flag policy)
226 debug(h, "-P %s %s\n", chain, fw3_flag_names[policy]);
229 if (h->family == FW3_FAMILY_V6)
230 ip6tc_set_policy(chain, fw3_flag_names[policy], NULL, h->handle);
233 iptc_set_policy(chain, fw3_flag_names[policy], NULL, h->handle);
237 fw3_ipt_flush_chain(struct fw3_ipt_handle *h, const char *chain)
240 debug(h, "-F %s\n", chain);
243 if (h->family == FW3_FAMILY_V6)
244 ip6tc_flush_entries(chain, h->handle);
247 iptc_flush_entries(chain, h->handle);
251 delete_rules(struct fw3_ipt_handle *h, const char *target)
254 const struct ipt_entry *e;
260 if (h->family == FW3_FAMILY_V6)
262 for (chain = ip6tc_first_chain(h->handle);
264 chain = ip6tc_next_chain(h->handle))
269 const struct ip6t_entry *e6;
270 for (num = 0, e6 = ip6tc_first_rule(chain, h->handle);
272 num++, e6 = ip6tc_next_rule(e6, h->handle))
274 t = ip6tc_get_target(e6, h->handle);
276 if (*t && !strcmp(t, target))
279 debug(h, "-D %s %u\n", chain, num + 1);
281 ip6tc_delete_num_entry(chain, num, h->handle);
292 for (chain = iptc_first_chain(h->handle);
294 chain = iptc_next_chain(h->handle))
299 for (num = 0, e = iptc_first_rule(chain, h->handle);
301 num++, e = iptc_next_rule(e, h->handle))
303 t = iptc_get_target(e, h->handle);
305 if (*t && !strcmp(t, target))
308 debug(h, "-D %s %u\n", chain, num + 1);
310 iptc_delete_num_entry(chain, num, h->handle);
321 fw3_ipt_delete_chain(struct fw3_ipt_handle *h, const char *chain)
323 delete_rules(h, chain);
326 debug(h, "-X %s\n", chain);
329 if (h->family == FW3_FAMILY_V6)
330 ip6tc_delete_chain(chain, h->handle);
333 iptc_delete_chain(chain, h->handle);
337 has_rule_tag(const void *base, unsigned int start, unsigned int end)
340 const struct xt_entry_match *em;
342 for (i = start; i < end; i += em->u.match_size)
346 if (strcmp(em->u.user.name, "comment"))
349 if (!memcmp(em->data, "!fw3", 4))
357 fw3_ipt_delete_id_rules(struct fw3_ipt_handle *h, const char *chain)
360 const struct ipt_entry *e;
364 if (h->family == FW3_FAMILY_V6)
366 if (!ip6tc_is_chain(chain, h->handle))
372 const struct ip6t_entry *e6;
373 for (num = 0, e6 = ip6tc_first_rule(chain, h->handle);
375 num++, e6 = ip6tc_next_rule(e6, h->handle))
377 if (has_rule_tag(e6, sizeof(*e6), e6->target_offset))
380 debug(h, "-D %s %u\n", chain, num + 1);
382 ip6tc_delete_num_entry(chain, num, h->handle);
392 if (!iptc_is_chain(chain, h->handle))
398 for (num = 0, e = iptc_first_rule(chain, h->handle);
400 num++, e = iptc_next_rule(e, h->handle))
402 if (has_rule_tag(e, sizeof(*e), e->target_offset))
405 debug(h, "-D %s %u\n", chain, num + 1);
407 iptc_delete_num_entry(chain, num, h->handle);
417 fw3_ipt_create_chain(struct fw3_ipt_handle *h, const char *fmt, ...)
423 vsnprintf(buf, sizeof(buf) - 1, fmt, ap);
427 debug(h, "-N %s\n", buf);
429 iptc_create_chain(buf, h->handle);
433 fw3_ipt_flush(struct fw3_ipt_handle *h)
438 if (h->family == FW3_FAMILY_V6)
440 for (chain = ip6tc_first_chain(h->handle);
442 chain = ip6tc_next_chain(h->handle))
444 ip6tc_flush_entries(chain, h->handle);
447 for (chain = ip6tc_first_chain(h->handle);
449 chain = ip6tc_next_chain(h->handle))
451 ip6tc_delete_chain(chain, h->handle);
457 for (chain = iptc_first_chain(h->handle);
459 chain = iptc_next_chain(h->handle))
461 iptc_flush_entries(chain, h->handle);
464 for (chain = iptc_first_chain(h->handle);
466 chain = iptc_next_chain(h->handle))
468 iptc_delete_chain(chain, h->handle);
474 chain_is_empty(struct fw3_ipt_handle *h, const char *chain)
477 if (h->family == FW3_FAMILY_V6)
478 return (!ip6tc_builtin(chain, h->handle) &&
479 !ip6tc_first_rule(chain, h->handle));
482 return (!iptc_builtin(chain, h->handle) &&
483 !iptc_first_rule(chain, h->handle));
487 fw3_ipt_gc(struct fw3_ipt_handle *h)
493 if (h->family == FW3_FAMILY_V6)
498 for (chain = ip6tc_first_chain(h->handle);
500 chain = ip6tc_next_chain(h->handle))
502 if (!chain_is_empty(h, chain))
505 fw3_ipt_delete_chain(h, chain);
517 for (chain = iptc_first_chain(h->handle);
519 chain = iptc_next_chain(h->handle))
521 warn("C=%s\n", chain);
523 if (!chain_is_empty(h, chain))
526 warn("D=%s\n", chain);
528 fw3_ipt_delete_chain(h, chain);
537 fw3_ipt_commit(struct fw3_ipt_handle *h)
542 if (h->family == FW3_FAMILY_V6)
544 rv = ip6tc_commit(h->handle);
546 warn("ip6tc_commit(): %s", ip6tc_strerror(errno));
551 rv = iptc_commit(h->handle);
553 warn("iptc_commit(): %s", iptc_strerror(errno));
558 fw3_ipt_close(struct fw3_ipt_handle *h)
563 struct fw3_ipt_rule *
564 fw3_ipt_rule_new(struct fw3_ipt_handle *h)
566 struct fw3_ipt_rule *r;
568 r = fw3_alloc(sizeof(*r));
571 r->argv = fw3_alloc(sizeof(char *));
572 r->argv[r->argc++] = "fw3";
579 is_chain(struct fw3_ipt_handle *h, const char *name)
582 if (h->family == FW3_FAMILY_V6)
583 return ip6tc_is_chain(name, h->handle);
586 return iptc_is_chain(name, h->handle);
590 get_protoname(struct fw3_ipt_rule *r)
592 const struct xtables_pprot *pp;
595 for (pp = xtables_chain_protos; pp->name; pp++)
596 if (pp->num == r->protocol)
597 return (char *)pp->name;
602 static struct xtables_match *
603 find_match(struct fw3_ipt_rule *r, const char *name)
605 struct xtables_match *m;
608 m = xtables_find_match(name, XTF_TRY_LOAD, &r->matches);
615 init_match(struct fw3_ipt_rule *r, struct xtables_match *m, bool no_clone)
618 struct xtables_globals *g;
623 s = XT_ALIGN(sizeof(struct xt_entry_match)) + m->size;
627 fw3_xt_set_match_name(m);
629 m->m->u.user.revision = m->revision;
630 m->m->u.match_size = s;
632 /* free previous userspace data */
633 fw3_xt_free_match_udata(m);
638 /* don't merge options if no_clone is set and this match is a clone */
639 if (no_clone && (m == m->next))
642 /* merge option table */
643 g = (r->h->family == FW3_FAMILY_V6) ? &xtg6 : &xtg;
644 fw3_xt_merge_match_options(g, m);
648 need_protomatch(struct fw3_ipt_rule *r, const char *pname)
653 if (!xtables_find_match(pname, XTF_DONT_LOAD, NULL))
656 return !r->protocol_loaded;
659 static struct xtables_match *
660 load_protomatch(struct fw3_ipt_rule *r)
662 const char *pname = get_protoname(r);
664 if (!need_protomatch(r, pname))
667 return find_match(r, pname);
670 static struct xtables_target *
671 find_target(struct fw3_ipt_rule *r, const char *name)
673 struct xtables_target *t;
677 if (is_chain(r->h, name))
678 t = xtables_find_target(XT_STANDARD_TARGET, XTF_TRY_LOAD);
680 t = xtables_find_target(name, XTF_TRY_LOAD);
687 static struct xtables_target *
688 get_target(struct fw3_ipt_rule *r, const char *name)
691 struct xtables_target *t;
692 struct xtables_globals *g;
694 t = find_target(r, name);
699 s = XT_ALIGN(sizeof(struct xt_entry_target)) + t->size;
702 fw3_xt_set_target_name(t, name);
704 t->t->u.user.revision = t->revision;
705 t->t->u.target_size = s;
707 /* free previous userspace data */
708 fw3_xt_free_target_udata(t);
713 /* merge option table */
714 g = (r->h->family == FW3_FAMILY_V6) ? &xtg6 : &xtg;
715 fw3_xt_merge_target_options(g, t);
723 fw3_ipt_rule_proto(struct fw3_ipt_rule *r, struct fw3_protocol *proto)
727 if (!proto || proto->any)
730 pr = proto->protocol;
733 if (r->h->family == FW3_FAMILY_V6)
738 r->e6.ipv6.proto = pr;
739 r->e6.ipv6.flags |= IP6T_F_PROTO;
742 r->e6.ipv6.invflags |= XT_INV_PROTO;
750 r->e.ip.invflags |= XT_INV_PROTO;
757 fw3_ipt_rule_in_out(struct fw3_ipt_rule *r,
758 struct fw3_device *in, struct fw3_device *out)
761 if (r->h->family == FW3_FAMILY_V6)
765 xtables_parse_interface(in->name, r->e6.ipv6.iniface,
766 r->e6.ipv6.iniface_mask);
769 r->e6.ipv6.invflags |= IP6T_INV_VIA_IN;
772 if (out && !out->any)
774 xtables_parse_interface(out->name, r->e6.ipv6.outiface,
775 r->e6.ipv6.outiface_mask);
778 r->e6.ipv6.invflags |= IP6T_INV_VIA_OUT;
786 xtables_parse_interface(in->name, r->e.ip.iniface,
787 r->e.ip.iniface_mask);
790 r->e.ip.invflags |= IPT_INV_VIA_IN;
793 if (out && !out->any)
795 xtables_parse_interface(out->name, r->e.ip.outiface,
796 r->e.ip.outiface_mask);
799 r->e.ip.invflags |= IPT_INV_VIA_OUT;
806 fw3_ipt_rule_src_dest(struct fw3_ipt_rule *r,
807 struct fw3_address *src, struct fw3_address *dest)
809 if ((src && src->range) || (dest && dest->range))
811 fw3_ipt_rule_addarg(r, false, "-m", "iprange");
818 fw3_ipt_rule_addarg(r, src->invert, "--src-range",
819 fw3_address_to_string(src, false, false));
822 else if (r->h->family == FW3_FAMILY_V6)
824 r->e6.ipv6.src = src->address.v6;
825 r->e6.ipv6.smsk = src->mask.v6;
828 for (i = 0; i < 4; i++)
829 r->e6.ipv6.src.s6_addr32[i] &= r->e6.ipv6.smsk.s6_addr32[i];
832 r->e6.ipv6.invflags |= IP6T_INV_SRCIP;
837 r->e.ip.src = src->address.v4;
838 r->e.ip.smsk = src->mask.v4;
840 r->e.ip.src.s_addr &= r->e.ip.smsk.s_addr;
843 r->e.ip.invflags |= IPT_INV_SRCIP;
847 if (dest && dest->set)
851 fw3_ipt_rule_addarg(r, dest->invert, "--dst-range",
852 fw3_address_to_string(dest, false, false));
855 else if (r->h->family == FW3_FAMILY_V6)
857 r->e6.ipv6.dst = dest->address.v6;
858 r->e6.ipv6.dmsk = dest->mask.v6;
861 for (i = 0; i < 4; i++)
862 r->e6.ipv6.dst.s6_addr32[i] &= r->e6.ipv6.dmsk.s6_addr32[i];
865 r->e6.ipv6.invflags |= IP6T_INV_DSTIP;
870 r->e.ip.dst = dest->address.v4;
871 r->e.ip.dmsk = dest->mask.v4;
873 r->e.ip.dst.s_addr &= r->e.ip.dmsk.s_addr;
876 r->e.ip.invflags |= IPT_INV_DSTIP;
882 fw3_ipt_rule_sport_dport(struct fw3_ipt_rule *r,
883 struct fw3_port *sp, struct fw3_port *dp)
885 char buf[sizeof("65535:65535\0")];
887 if ((!sp || !sp->set) && (!dp || !dp->set))
890 if (!get_protoname(r))
895 if (sp->port_min == sp->port_max)
896 sprintf(buf, "%u", sp->port_min);
898 sprintf(buf, "%u:%u", sp->port_min, sp->port_max);
900 fw3_ipt_rule_addarg(r, sp->invert, "--sport", buf);
905 if (dp->port_min == dp->port_max)
906 sprintf(buf, "%u", dp->port_min);
908 sprintf(buf, "%u:%u", dp->port_min, dp->port_max);
910 fw3_ipt_rule_addarg(r, dp->invert, "--dport", buf);
915 fw3_ipt_rule_device(struct fw3_ipt_rule *r, const char *device, bool out)
918 struct fw3_device dev = { .any = false };
919 strncpy(dev.name, device, sizeof(dev.name) - 1);
920 fw3_ipt_rule_in_out(r, (out) ? NULL : &dev, (out) ? &dev : NULL);
925 fw3_ipt_rule_mac(struct fw3_ipt_rule *r, struct fw3_mac *mac)
927 char buf[sizeof("ff:ff:ff:ff:ff:ff\0")];
928 uint8_t *addr = mac->mac.ether_addr_octet;
933 sprintf(buf, "%02x:%02x:%02x:%02x:%02x:%02x",
934 addr[0], addr[1], addr[2], addr[3], addr[4], addr[5]);
936 fw3_ipt_rule_addarg(r, false, "-m", "mac");
937 fw3_ipt_rule_addarg(r, mac->invert, "--mac-source", buf);
941 fw3_ipt_rule_icmptype(struct fw3_ipt_rule *r, struct fw3_icmptype *icmp)
943 char buf[sizeof("255/255\0")];
949 if (r->h->family == FW3_FAMILY_V6)
951 if (icmp->code6_min == 0 && icmp->code6_max == 0xFF)
952 sprintf(buf, "%u", icmp->type6);
954 sprintf(buf, "%u/%u", icmp->type6, icmp->code6_min);
956 fw3_ipt_rule_addarg(r, icmp->invert, "--icmpv6-type", buf);
961 if (icmp->code_min == 0 && icmp->code_max == 0xFF)
962 sprintf(buf, "%u", icmp->type);
964 sprintf(buf, "%u/%u", icmp->type, icmp->code_min);
966 fw3_ipt_rule_addarg(r, icmp->invert, "--icmp-type", buf);
971 fw3_ipt_rule_limit(struct fw3_ipt_rule *r, struct fw3_limit *limit)
973 char buf[sizeof("-4294967296/second\0")];
975 if (!limit || limit->rate <= 0)
978 fw3_ipt_rule_addarg(r, false, "-m", "limit");
980 sprintf(buf, "%u/%s", limit->rate, fw3_limit_units[limit->unit]);
981 fw3_ipt_rule_addarg(r, limit->invert, "--limit", buf);
983 if (limit->burst > 0)
985 sprintf(buf, "%u", limit->burst);
986 fw3_ipt_rule_addarg(r, limit->invert, "--limit-burst", buf);
991 fw3_ipt_rule_ipset(struct fw3_ipt_rule *r, struct fw3_setmatch *match)
993 char buf[sizeof("dst,dst,dst\0")];
997 struct fw3_ipset *set;
998 struct fw3_ipset_datatype *type;
1000 if (!match || !match->set || !match->ptr)
1004 list_for_each_entry(type, &set->datatypes, list)
1012 p += sprintf(p, "%s", match->dir[i] ? match->dir[i] : type->dir);
1016 fw3_ipt_rule_addarg(r, false, "-m", "set");
1018 fw3_ipt_rule_addarg(r, match->invert, "--match-set",
1019 set->external ? set->external : set->name);
1021 fw3_ipt_rule_addarg(r, false, buf, NULL);
1025 fw3_ipt_rule_time(struct fw3_ipt_rule *r, struct fw3_time *time)
1028 struct tm empty = { 0 };
1030 char buf[84]; /* sizeof("1,2,3,...,30,31\0") */
1033 bool d1 = memcmp(&time->datestart, &empty, sizeof(empty));
1034 bool d2 = memcmp(&time->datestop, &empty, sizeof(empty));
1036 if (!d1 && !d2 && !time->timestart && !time->timestop &&
1037 !(time->monthdays & 0xFFFFFFFE) && !(time->weekdays & 0xFE))
1042 fw3_ipt_rule_addarg(r, false, "-m", "time");
1045 fw3_ipt_rule_addarg(r, false, "--kerneltz", NULL);
1049 strftime(buf, sizeof(buf), "%Y-%m-%dT%H:%M:%S", &time->datestart);
1050 fw3_ipt_rule_addarg(r, false, "--datestart", buf);
1055 strftime(buf, sizeof(buf), "%Y-%m-%dT%H:%M:%S", &time->datestop);
1056 fw3_ipt_rule_addarg(r, false, "--datestop", buf);
1059 if (time->timestart)
1061 sprintf(buf, "%02d:%02d:%02d",
1062 time->timestart / 3600,
1063 time->timestart % 3600 / 60,
1064 time->timestart % 60);
1066 fw3_ipt_rule_addarg(r, false, "--timestart", buf);
1071 sprintf(buf, "%02d:%02d:%02d",
1072 time->timestop / 3600,
1073 time->timestop % 3600 / 60,
1074 time->timestop % 60);
1076 fw3_ipt_rule_addarg(r, false, "--timestop", buf);
1079 if (time->monthdays & 0xFFFFFFFE)
1081 for (i = 1, p = buf; i < 32; i++)
1083 if (fw3_hasbit(time->monthdays, i))
1088 p += sprintf(p, "%u", i);
1092 fw3_ipt_rule_addarg(r, fw3_hasbit(time->monthdays, 0), "--monthdays", buf);
1095 if (time->weekdays & 0xFE)
1097 for (i = 1, p = buf; i < 8; i++)
1099 if (fw3_hasbit(time->weekdays, i))
1104 p += sprintf(p, "%u", i);
1108 fw3_ipt_rule_addarg(r, fw3_hasbit(time->weekdays, 0), "--weekdays", buf);
1113 fw3_ipt_rule_mark(struct fw3_ipt_rule *r, struct fw3_mark *mark)
1115 char buf[sizeof("0xFFFFFFFF/0xFFFFFFFF\0")];
1117 if (!mark || !mark->set)
1120 if (mark->mask < 0xFFFFFFFF)
1121 sprintf(buf, "0x%x/0x%x", mark->mark, mark->mask);
1123 sprintf(buf, "0x%x", mark->mark);
1125 fw3_ipt_rule_addarg(r, false, "-m", "mark");
1126 fw3_ipt_rule_addarg(r, mark->invert, "--mark", buf);
1130 fw3_ipt_rule_comment(struct fw3_ipt_rule *r, const char *fmt, ...)
1139 vsnprintf(buf, sizeof(buf) - 1, fmt, ap);
1142 fw3_ipt_rule_addarg(r, false, "-m", "comment");
1143 fw3_ipt_rule_addarg(r, false, "--comment", buf);
1147 fw3_ipt_rule_extra(struct fw3_ipt_rule *r, const char *extra)
1151 if (!extra || !*extra)
1154 s = fw3_strdup(extra);
1156 for (p = strtok(s, " \t"); p; p = strtok(NULL, " \t"))
1158 tmp = realloc(r->argv, (r->argc + 1) * sizeof(*r->argv));
1164 r->argv[r->argc++] = fw3_strdup(p);
1170 #ifndef DISABLE_IPV6
1172 rule_print6(struct ip6t_entry *e)
1174 char buf1[INET6_ADDRSTRLEN], buf2[INET6_ADDRSTRLEN];
1177 if (e->ipv6.flags & IP6T_F_PROTO)
1179 if (e->ipv6.invflags & XT_INV_PROTO)
1182 pname = get_protoname(container_of(e, struct fw3_ipt_rule, e6));
1185 printf(" -p %s", pname);
1187 printf(" -p %u", e->ipv6.proto);
1190 if (e->ipv6.iniface[0])
1192 if (e->ipv6.invflags & IP6T_INV_VIA_IN)
1195 printf(" -i %s", e->ipv6.iniface);
1198 if (e->ipv6.outiface[0])
1200 if (e->ipv6.invflags & IP6T_INV_VIA_OUT)
1203 printf(" -o %s", e->ipv6.outiface);
1206 if (memcmp(&e->ipv6.src, &in6addr_any, sizeof(struct in6_addr)))
1208 if (e->ipv6.invflags & IP6T_INV_SRCIP)
1212 inet_ntop(AF_INET6, &e->ipv6.src, buf1, sizeof(buf1)),
1213 inet_ntop(AF_INET6, &e->ipv6.smsk, buf2, sizeof(buf2)));
1216 if (memcmp(&e->ipv6.dst, &in6addr_any, sizeof(struct in6_addr)))
1218 if (e->ipv6.invflags & IP6T_INV_DSTIP)
1222 inet_ntop(AF_INET6, &e->ipv6.dst, buf1, sizeof(buf1)),
1223 inet_ntop(AF_INET6, &e->ipv6.dmsk, buf2, sizeof(buf2)));
1229 rule_print4(struct ipt_entry *e)
1231 struct in_addr in_zero = { 0 };
1232 char buf1[sizeof("255.255.255.255\0")], buf2[sizeof("255.255.255.255\0")];
1237 if (e->ip.invflags & XT_INV_PROTO)
1240 pname = get_protoname(container_of(e, struct fw3_ipt_rule, e));
1243 printf(" -p %s", pname);
1245 printf(" -p %u", e->ip.proto);
1248 if (e->ip.iniface[0])
1250 if (e->ip.invflags & IPT_INV_VIA_IN)
1253 printf(" -i %s", e->ip.iniface);
1256 if (e->ip.outiface[0])
1258 if (e->ip.invflags & IPT_INV_VIA_OUT)
1261 printf(" -o %s", e->ip.outiface);
1264 if (memcmp(&e->ip.src, &in_zero, sizeof(struct in_addr)))
1266 if (e->ip.invflags & IPT_INV_SRCIP)
1270 inet_ntop(AF_INET, &e->ip.src, buf1, sizeof(buf1)),
1271 inet_ntop(AF_INET, &e->ip.smsk, buf2, sizeof(buf2)));
1274 if (memcmp(&e->ip.dst, &in_zero, sizeof(struct in_addr)))
1276 if (e->ip.invflags & IPT_INV_DSTIP)
1280 inet_ntop(AF_INET, &e->ip.dst, buf1, sizeof(buf1)),
1281 inet_ntop(AF_INET, &e->ip.dmsk, buf2, sizeof(buf2)));
1286 rule_print(struct fw3_ipt_rule *r, const char *prefix, const char *chain)
1288 debug(r->h, "%s %s", prefix, chain);
1290 #ifndef DISABLE_IPV6
1291 if (r->h->family == FW3_FAMILY_V6)
1292 rule_print6(&r->e6);
1297 fw3_xt_print_matches(&r->e.ip, r->matches);
1298 fw3_xt_print_target(&r->e.ip, r->target);
1304 parse_option(struct fw3_ipt_rule *r, int optc, bool inv)
1306 struct xtables_rule_match *m;
1307 struct xtables_match *em;
1309 /* is a target option */
1310 if (r->target && fw3_xt_has_target_parse(r->target) &&
1311 optc >= r->target->option_offset &&
1312 optc < (r->target->option_offset + 256))
1314 xtables_option_tpcall(optc, r->argv, inv, r->target, &r->e);
1318 /* try to dispatch argument to one of the match parsers */
1319 for (m = r->matches; m; m = m->next)
1323 if (m->completed || !fw3_xt_has_match_parse(em))
1326 if (optc < em->option_offset ||
1327 optc >= (em->option_offset + 256))
1330 xtables_option_mpcall(optc, r->argv, inv, em, &r->e);
1334 /* unhandled option, might belong to a protocol match */
1335 if ((em = load_protomatch(r)) != NULL)
1337 init_match(r, em, false);
1339 r->protocol_loaded = true;
1346 warn("parse_option(): option '%s' needs argument", r->argv[optind-1]);
1349 warn("parse_option(): unknown option '%s'", r->argv[optind-1]);
1355 fw3_ipt_rule_addarg(struct fw3_ipt_rule *r, bool inv,
1356 const char *k, const char *v)
1364 n = inv + !!k + !!v;
1365 tmp = realloc(r->argv, (r->argc + n) * sizeof(*tmp));
1373 r->argv[r->argc++] = fw3_strdup("!");
1375 r->argv[r->argc++] = fw3_strdup(k);
1378 r->argv[r->argc++] = fw3_strdup(v);
1381 static unsigned char *
1382 rule_mask(struct fw3_ipt_rule *r)
1385 unsigned char *p, *mask = NULL;
1386 struct xtables_rule_match *m;
1388 #define SZ(x) XT_ALIGN(sizeof(struct x))
1390 #ifndef DISABLE_IPV6
1391 if (r->h->family == FW3_FAMILY_V6)
1395 for (m = r->matches; m; m = m->next)
1396 s += SZ(ip6t_entry_match) + m->match->size;
1398 s += SZ(ip6t_entry_target);
1400 s += r->target->size;
1402 mask = fw3_alloc(s);
1403 memset(mask, 0xFF, SZ(ip6t_entry));
1404 p = mask + SZ(ip6t_entry);
1406 for (m = r->matches; m; m = m->next)
1408 memset(p, 0xFF, SZ(ip6t_entry_match) + m->match->userspacesize);
1409 p += SZ(ip6t_entry_match) + m->match->size;
1412 memset(p, 0xFF, SZ(ip6t_entry_target) + (r->target) ? r->target->userspacesize : 0);
1419 for (m = r->matches; m; m = m->next)
1420 s += SZ(ipt_entry_match) + m->match->size;
1422 s += SZ(ipt_entry_target);
1424 s += r->target->size;
1426 mask = fw3_alloc(s);
1427 memset(mask, 0xFF, SZ(ipt_entry));
1428 p = mask + SZ(ipt_entry);
1430 for (m = r->matches; m; m = m->next)
1432 memset(p, 0xFF, SZ(ipt_entry_match) + m->match->userspacesize);
1433 p += SZ(ipt_entry_match) + m->match->size;
1436 memset(p, 0xFF, SZ(ipt_entry_target) + (r->target) ? r->target->userspacesize : 0);
1443 rule_build(struct fw3_ipt_rule *r)
1445 size_t s, target_size = (r->target) ? r->target->t->u.target_size : 0;
1446 struct xtables_rule_match *m;
1448 #ifndef DISABLE_IPV6
1449 if (r->h->family == FW3_FAMILY_V6)
1451 struct ip6t_entry *e6;
1453 s = XT_ALIGN(sizeof(struct ip6t_entry));
1455 for (m = r->matches; m; m = m->next)
1456 s += m->match->m->u.match_size;
1458 e6 = fw3_alloc(s + target_size);
1460 memcpy(e6, &r->e6, sizeof(struct ip6t_entry));
1462 e6->target_offset = s;
1463 e6->next_offset = s + target_size;
1467 for (m = r->matches; m; m = m->next)
1469 memcpy(e6->elems + s, m->match->m, m->match->m->u.match_size);
1470 s += m->match->m->u.match_size;
1474 memcpy(e6->elems + s, r->target->t, target_size);
1481 struct ipt_entry *e;
1483 s = XT_ALIGN(sizeof(struct ipt_entry));
1485 for (m = r->matches; m; m = m->next)
1486 s += m->match->m->u.match_size;
1488 e = fw3_alloc(s + target_size);
1490 memcpy(e, &r->e, sizeof(struct ipt_entry));
1492 e->target_offset = s;
1493 e->next_offset = s + target_size;
1497 for (m = r->matches; m; m = m->next)
1499 memcpy(e->elems + s, m->match->m, m->match->m->u.match_size);
1500 s += m->match->m->u.match_size;
1504 memcpy(e->elems + s, r->target->t, target_size);
1511 set_rule_tag(struct fw3_ipt_rule *r)
1515 const char *tag = "!fw3";
1517 for (i = 0; i < r->argc; i++)
1518 if (!strcmp(r->argv[i], "--comment") && (i + 1) < r->argc)
1519 if (asprintf(&p, "%s: %s", tag, r->argv[i + 1]) > 0)
1521 free(r->argv[i + 1]);
1526 tmp = realloc(r->argv, (r->argc + 4) * sizeof(*r->argv));
1531 r->argv[r->argc++] = fw3_strdup("-m");
1532 r->argv[r->argc++] = fw3_strdup("comment");
1533 r->argv[r->argc++] = fw3_strdup("--comment");
1534 r->argv[r->argc++] = fw3_strdup(tag);
1539 __fw3_ipt_rule_append(struct fw3_ipt_rule *r, bool repl, const char *fmt, ...)
1542 unsigned char *mask;
1544 struct xtables_rule_match *m;
1545 struct xtables_match *em;
1546 struct xtables_target *et;
1547 struct xtables_globals *g;
1549 enum xtables_exittype status;
1557 vsnprintf(buf, sizeof(buf) - 1, fmt, ap);
1560 g = (r->h->family == FW3_FAMILY_V6) ? &xtg6 : &xtg;
1561 g->opts = g->orig_opts;
1566 status = setjmp(fw3_ipt_error_jmp);
1570 info(" ! Skipping due to previous exception (code %u)", status);
1576 while ((optc = getopt_long(r->argc, r->argv, "-:m:j:", g->opts,
1582 em = find_match(r, optarg);
1586 warn("fw3_ipt_rule_append(): Can't find match '%s'", optarg);
1590 init_match(r, em, true);
1594 et = get_target(r, optarg);
1598 warn("fw3_ipt_rule_append(): Can't find target '%s'", optarg);
1605 if ((optarg[0] == '!') && (optarg[1] == '\0'))
1612 warn("fw3_ipt_rule_append(): Bad argument '%s'", optarg);
1616 if (parse_option(r, optc, inv))
1624 for (m = r->matches; m; m = m->next)
1625 xtables_option_mfcall(m->match);
1628 xtables_option_tfcall(r->target);
1630 rule = rule_build(r);
1632 #ifndef DISABLE_IPV6
1633 if (r->h->family == FW3_FAMILY_V6)
1637 mask = rule_mask(r);
1639 while (ip6tc_delete_entry(buf, rule, mask, r->h->handle))
1641 rule_print(r, "-D", buf);
1647 rule_print(r, "-A", buf);
1649 if (!ip6tc_append_entry(buf, rule, r->h->handle))
1650 warn("ip6tc_append_entry(): %s", ip6tc_strerror(errno));
1657 mask = rule_mask(r);
1659 while (iptc_delete_entry(buf, rule, mask, r->h->handle))
1661 rule_print(r, "-D", buf);
1667 rule_print(r, "-A", buf);
1669 if (!iptc_append_entry(buf, rule, r->h->handle))
1670 warn("iptc_append_entry(): %s\n", iptc_strerror(errno));
1676 for (i = 1; i < r->argc; i++)
1681 xtables_rule_matches_free(&r->matches);
1688 /* reset all targets and matches */
1689 for (em = xtables_matches; em; em = em->next)
1692 for (et = xtables_targets; et; et = et->next)
1698 xtables_free_opts(1);
1701 struct fw3_ipt_rule *
1702 fw3_ipt_rule_create(struct fw3_ipt_handle *handle, struct fw3_protocol *proto,
1703 struct fw3_device *in, struct fw3_device *out,
1704 struct fw3_address *src, struct fw3_address *dest)
1706 struct fw3_ipt_rule *r;
1708 r = fw3_ipt_rule_new(handle);
1710 fw3_ipt_rule_proto(r, proto);
1711 fw3_ipt_rule_in_out(r, in, out);
1712 fw3_ipt_rule_src_dest(r, src, dest);
1718 xtables_register_match(struct xtables_match *me)
1721 static struct xtables_match **tmp;
1723 if (!xext.register_match)
1724 xext.register_match = dlsym(RTLD_NEXT, "xtables_register_match");
1726 if (!xext.register_match)
1729 xext.register_match(me);
1733 for (i = 0; i < xext.mcount; i++)
1734 if (xext.matches[i] == me)
1737 tmp = realloc(xext.matches, sizeof(me) * (xext.mcount + 1));
1743 xext.matches[xext.mcount++] = me;
1748 xtables_register_target(struct xtables_target *me)
1751 static struct xtables_target **tmp;
1753 if (!xext.register_target)
1754 xext.register_target = dlsym(RTLD_NEXT, "xtables_register_target");
1756 if (!xext.register_target)
1759 xext.register_target(me);
1763 for (i = 0; i < xext.tcount; i++)
1764 if (xext.targets[i] == me)
1767 tmp = realloc(xext.targets, sizeof(me) * (xext.tcount + 1));
1773 xext.targets[xext.tcount++] = me;