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"
58 #define XT_LOCK_NAME "/var/run/xtables.lock"
59 static int xt_lock_fd
= -1;
62 struct fw3_ipt_handle
*h
;
69 struct xtables_rule_match
*matches
;
70 struct xtables_target
*target
;
79 static struct option base_opts
[] = {
80 { .name
= "match", .has_arg
= 1, .val
= 'm' },
81 { .name
= "jump", .has_arg
= 1, .val
= 'j' },
82 { .name
= "in-interface", .has_arg
= 1, .val
= 'i' },
83 { .name
= "out-interface", .has_arg
= 1, .val
= 'o' },
84 { .name
= "source", .has_arg
= 1, .val
= 's' },
85 { .name
= "destination", .has_arg
= 1, .val
= 'd' },
90 static jmp_buf fw3_ipt_error_jmp
;
92 static __attribute__((noreturn
))
93 void fw3_ipt_error_handler(enum xtables_exittype status
,
98 fprintf(stderr
, " ! Exception: ");
101 vfprintf(stderr
, fmt
, args
);
104 longjmp(fw3_ipt_error_jmp
, status
);
107 static struct xtables_globals xtg
= {
109 .program_version
= "4",
110 .orig_opts
= base_opts
,
111 .exit_err
= fw3_ipt_error_handler
,
112 #if XTABLES_VERSION_CODE > 10
113 .compat_rev
= xtables_compatible_revision
,
117 static struct xtables_globals xtg6
= {
119 .program_version
= "6",
120 .orig_opts
= base_opts
,
121 .exit_err
= fw3_ipt_error_handler
,
122 #if XTABLES_VERSION_CODE > 10
123 .compat_rev
= xtables_compatible_revision
,
130 struct xtables_match
**matches
;
131 struct xtables_target
**targets
;
132 void (*register_match
)(struct xtables_match
*);
133 void (*register_target
)(struct xtables_target
*);
137 /* Required by certain extensions like SNAT and DNAT */
138 int kernel_version
= 0;
141 get_kernel_version(void)
143 static struct utsname uts
;
144 int x
= 3, y
= 0, z
= 0;
146 if (uname(&uts
) != -1)
147 sscanf(uts
.release
, "%d.%d.%d", &x
, &y
, &z
);
149 kernel_version
= 0x10000 * x
+ 0x100 * y
+ z
;
152 static void fw3_init_extensions(void)
162 struct fw3_ipt_handle
*
163 fw3_ipt_open(enum fw3_family family
, enum fw3_table table
)
166 struct fw3_ipt_handle
*h
;
168 h
= fw3_alloc(sizeof(*h
));
172 while (!fw3_lock_path(&xt_lock_fd
, XT_LOCK_NAME
)) {
173 warn("Currently busy xtables.lock - wait 1 second");
177 if (family
== FW3_FAMILY_V6
)
180 h
->family
= FW3_FAMILY_V6
;
182 h
->handle
= ip6tc_init(fw3_flag_names
[table
]);
184 xtables_set_params(&xtg6
);
185 xtables_set_nfproto(NFPROTO_IPV6
);
190 h
->family
= FW3_FAMILY_V4
;
192 h
->handle
= iptc_init(fw3_flag_names
[table
]);
194 xtables_set_params(&xtg
);
195 xtables_set_nfproto(NFPROTO_IPV4
);
201 fw3_unlock_path(&xt_lock_fd
, XT_LOCK_NAME
);
206 fw3_init_extensions();
208 if (xext
.register_match
)
209 for (i
= 0; i
< xext
.mcount
; i
++)
210 xext
.register_match(xext
.matches
[i
]);
212 if (xext
.register_target
)
213 for (i
= 0; i
< xext
.tcount
; i
++)
214 xext
.register_target(xext
.targets
[i
]);
220 debug(struct fw3_ipt_handle
*h
, const char *fmt
, ...)
224 printf("%s -t %s ", (h
->family
== FW3_FAMILY_V6
) ? "ip6tables" : "iptables",
225 fw3_flag_names
[h
->table
]);
233 fw3_ipt_set_policy(struct fw3_ipt_handle
*h
, const char *chain
,
234 enum fw3_flag policy
)
237 debug(h
, "-P %s %s\n", chain
, fw3_flag_names
[policy
]);
240 if (h
->family
== FW3_FAMILY_V6
)
241 ip6tc_set_policy(chain
, fw3_flag_names
[policy
], NULL
, h
->handle
);
244 iptc_set_policy(chain
, fw3_flag_names
[policy
], NULL
, h
->handle
);
248 fw3_ipt_flush_chain(struct fw3_ipt_handle
*h
, const char *chain
)
251 debug(h
, "-F %s\n", chain
);
254 if (h
->family
== FW3_FAMILY_V6
)
255 ip6tc_flush_entries(chain
, h
->handle
);
258 iptc_flush_entries(chain
, h
->handle
);
262 delete_rules(struct fw3_ipt_handle
*h
, const char *target
)
265 const struct ipt_entry
*e
;
271 if (h
->family
== FW3_FAMILY_V6
)
273 for (chain
= ip6tc_first_chain(h
->handle
);
275 chain
= ip6tc_next_chain(h
->handle
))
280 const struct ip6t_entry
*e6
;
281 for (num
= 0, e6
= ip6tc_first_rule(chain
, h
->handle
);
283 num
++, e6
= ip6tc_next_rule(e6
, h
->handle
))
285 t
= ip6tc_get_target(e6
, h
->handle
);
287 if (*t
&& !strcmp(t
, target
))
290 debug(h
, "-D %s %u\n", chain
, num
+ 1);
292 ip6tc_delete_num_entry(chain
, num
, h
->handle
);
303 for (chain
= iptc_first_chain(h
->handle
);
305 chain
= iptc_next_chain(h
->handle
))
310 for (num
= 0, e
= iptc_first_rule(chain
, h
->handle
);
312 num
++, e
= iptc_next_rule(e
, h
->handle
))
314 t
= iptc_get_target(e
, h
->handle
);
316 if (*t
&& !strcmp(t
, target
))
319 debug(h
, "-D %s %u\n", chain
, num
+ 1);
321 iptc_delete_num_entry(chain
, num
, h
->handle
);
332 is_referenced(struct fw3_ipt_handle
*h
, const char *target
)
334 const struct ipt_entry
*e
;
339 if (h
->family
== FW3_FAMILY_V6
)
341 for (chain
= ip6tc_first_chain(h
->handle
);
343 chain
= ip6tc_next_chain(h
->handle
))
345 const struct ip6t_entry
*e6
;
346 for (e6
= ip6tc_first_rule(chain
, h
->handle
);
348 e6
= ip6tc_next_rule(e6
, h
->handle
))
350 t
= ip6tc_get_target(e6
, h
->handle
);
352 if (*t
&& !strcmp(t
, target
))
360 for (chain
= iptc_first_chain(h
->handle
);
362 chain
= iptc_next_chain(h
->handle
))
364 for (e
= iptc_first_rule(chain
, h
->handle
);
366 e
= iptc_next_rule(e
, h
->handle
))
368 t
= iptc_get_target(e
, h
->handle
);
370 if (*t
&& !strcmp(t
, target
))
380 fw3_ipt_delete_chain(struct fw3_ipt_handle
*h
, bool if_unused
,
383 if (if_unused
&& is_referenced(h
, chain
))
386 delete_rules(h
, chain
);
389 debug(h
, "-X %s\n", chain
);
392 if (h
->family
== FW3_FAMILY_V6
)
393 ip6tc_delete_chain(chain
, h
->handle
);
396 iptc_delete_chain(chain
, h
->handle
);
400 has_rule_tag(const void *base
, unsigned int start
, unsigned int end
)
403 const struct xt_entry_match
*em
;
405 for (i
= start
; i
< end
; i
+= em
->u
.match_size
)
409 if (strcmp(em
->u
.user
.name
, "comment"))
412 if (!memcmp(em
->data
, "!fw3", 4))
420 fw3_ipt_delete_id_rules(struct fw3_ipt_handle
*h
, const char *chain
)
423 const struct ipt_entry
*e
;
427 if (h
->family
== FW3_FAMILY_V6
)
429 if (!ip6tc_is_chain(chain
, h
->handle
))
435 const struct ip6t_entry
*e6
;
436 for (num
= 0, e6
= ip6tc_first_rule(chain
, h
->handle
);
438 num
++, e6
= ip6tc_next_rule(e6
, h
->handle
))
440 if (has_rule_tag(e6
, sizeof(*e6
), e6
->target_offset
))
443 debug(h
, "-D %s %u\n", chain
, num
+ 1);
445 ip6tc_delete_num_entry(chain
, num
, h
->handle
);
455 if (!iptc_is_chain(chain
, h
->handle
))
461 for (num
= 0, e
= iptc_first_rule(chain
, h
->handle
);
463 num
++, e
= iptc_next_rule(e
, h
->handle
))
465 if (has_rule_tag(e
, sizeof(*e
), e
->target_offset
))
468 debug(h
, "-D %s %u\n", chain
, num
+ 1);
470 iptc_delete_num_entry(chain
, num
, h
->handle
);
481 is_chain(struct fw3_ipt_handle
*h
, const char *name
)
484 if (h
->family
== FW3_FAMILY_V6
)
485 return ip6tc_is_chain(name
, h
->handle
);
488 return iptc_is_chain(name
, h
->handle
);
492 fw3_ipt_create_chain(struct fw3_ipt_handle
*h
, bool ignore_existing
,
495 if (ignore_existing
&& is_chain(h
, chain
))
499 debug(h
, "-N %s\n", chain
);
501 iptc_create_chain(chain
, h
->handle
);
505 fw3_ipt_flush(struct fw3_ipt_handle
*h
)
510 if (h
->family
== FW3_FAMILY_V6
)
512 for (chain
= ip6tc_first_chain(h
->handle
);
514 chain
= ip6tc_next_chain(h
->handle
))
516 ip6tc_flush_entries(chain
, h
->handle
);
519 for (chain
= ip6tc_first_chain(h
->handle
);
521 chain
= ip6tc_next_chain(h
->handle
))
523 ip6tc_delete_chain(chain
, h
->handle
);
529 for (chain
= iptc_first_chain(h
->handle
);
531 chain
= iptc_next_chain(h
->handle
))
533 iptc_flush_entries(chain
, h
->handle
);
536 for (chain
= iptc_first_chain(h
->handle
);
538 chain
= iptc_next_chain(h
->handle
))
540 iptc_delete_chain(chain
, h
->handle
);
546 chain_is_empty(struct fw3_ipt_handle
*h
, const char *chain
)
549 if (h
->family
== FW3_FAMILY_V6
)
550 return (!ip6tc_builtin(chain
, h
->handle
) &&
551 !ip6tc_first_rule(chain
, h
->handle
));
554 return (!iptc_builtin(chain
, h
->handle
) &&
555 !iptc_first_rule(chain
, h
->handle
));
559 fw3_ipt_gc(struct fw3_ipt_handle
*h
)
565 if (h
->family
== FW3_FAMILY_V6
)
570 for (chain
= ip6tc_first_chain(h
->handle
);
572 chain
= ip6tc_next_chain(h
->handle
))
574 if (!chain_is_empty(h
, chain
))
577 fw3_ipt_delete_chain(h
, false, chain
);
589 for (chain
= iptc_first_chain(h
->handle
);
591 chain
= iptc_next_chain(h
->handle
))
593 warn("C=%s\n", chain
);
595 if (!chain_is_empty(h
, chain
))
598 warn("D=%s\n", chain
);
600 fw3_ipt_delete_chain(h
, false, chain
);
609 fw3_ipt_commit(struct fw3_ipt_handle
*h
)
614 if (h
->family
== FW3_FAMILY_V6
)
616 rv
= ip6tc_commit(h
->handle
);
618 warn("ip6tc_commit(): %s", ip6tc_strerror(errno
));
623 rv
= iptc_commit(h
->handle
);
625 warn("iptc_commit(): %s", iptc_strerror(errno
));
630 fw3_ipt_close(struct fw3_ipt_handle
*h
)
632 fw3_unlock_path(&xt_lock_fd
, XT_LOCK_NAME
);
636 struct fw3_ipt_rule
*
637 fw3_ipt_rule_new(struct fw3_ipt_handle
*h
)
639 struct fw3_ipt_rule
*r
;
641 r
= fw3_alloc(sizeof(*r
));
644 r
->argv
= fw3_alloc(sizeof(char *));
645 r
->argv
[r
->argc
++] = "fw3";
652 get_protoname(struct fw3_ipt_rule
*r
)
654 const struct xtables_pprot
*pp
;
657 for (pp
= xtables_chain_protos
; pp
->name
; pp
++)
658 if (pp
->num
== r
->protocol
)
659 return (char *)pp
->name
;
664 static struct xtables_match
*
665 find_match(struct fw3_ipt_rule
*r
, const char *name
)
667 struct xtables_match
*m
;
670 m
= xtables_find_match(name
, XTF_TRY_LOAD
, &r
->matches
);
677 init_match(struct fw3_ipt_rule
*r
, struct xtables_match
*m
, bool no_clone
)
680 struct xtables_globals
*g
;
685 s
= XT_ALIGN(sizeof(struct xt_entry_match
)) + m
->size
;
689 fw3_xt_set_match_name(m
);
691 m
->m
->u
.user
.revision
= m
->revision
;
692 m
->m
->u
.match_size
= s
;
694 /* free previous userspace data */
695 fw3_xt_free_match_udata(m
);
700 /* don't merge options if no_clone is set and this match is a clone */
701 if (no_clone
&& (m
== m
->next
))
704 /* merge option table */
705 g
= (r
->h
->family
== FW3_FAMILY_V6
) ? &xtg6
: &xtg
;
706 fw3_xt_merge_match_options(g
, m
);
710 need_protomatch(struct fw3_ipt_rule
*r
, const char *pname
)
715 if (!xtables_find_match(pname
, XTF_DONT_LOAD
, NULL
))
718 return !r
->protocol_loaded
;
721 static struct xtables_match
*
722 load_protomatch(struct fw3_ipt_rule
*r
)
724 const char *pname
= get_protoname(r
);
726 if (!need_protomatch(r
, pname
))
729 return find_match(r
, pname
);
732 static struct xtables_target
*
733 find_target(struct fw3_ipt_rule
*r
, const char *name
)
735 struct xtables_target
*t
;
739 if (is_chain(r
->h
, name
))
740 t
= xtables_find_target(XT_STANDARD_TARGET
, XTF_TRY_LOAD
);
742 t
= xtables_find_target(name
, XTF_TRY_LOAD
);
749 static struct xtables_target
*
750 get_target(struct fw3_ipt_rule
*r
, const char *name
)
753 struct xtables_target
*t
;
754 struct xtables_globals
*g
;
756 t
= find_target(r
, name
);
761 s
= XT_ALIGN(sizeof(struct xt_entry_target
)) + t
->size
;
764 fw3_xt_set_target_name(t
, name
);
766 t
->t
->u
.user
.revision
= t
->revision
;
767 t
->t
->u
.target_size
= s
;
769 /* free previous userspace data */
770 fw3_xt_free_target_udata(t
);
775 /* merge option table */
776 g
= (r
->h
->family
== FW3_FAMILY_V6
) ? &xtg6
: &xtg
;
777 fw3_xt_merge_target_options(g
, t
);
785 fw3_ipt_rule_proto(struct fw3_ipt_rule
*r
, struct fw3_protocol
*proto
)
789 if (!proto
|| proto
->any
)
792 pr
= proto
->protocol
;
795 if (r
->h
->family
== FW3_FAMILY_V6
)
800 r
->e6
.ipv6
.proto
= pr
;
801 r
->e6
.ipv6
.flags
|= IP6T_F_PROTO
;
804 r
->e6
.ipv6
.invflags
|= XT_INV_PROTO
;
812 r
->e
.ip
.invflags
|= XT_INV_PROTO
;
819 fw3_ipt_rule_in_out(struct fw3_ipt_rule
*r
,
820 struct fw3_device
*in
, struct fw3_device
*out
)
823 if (r
->h
->family
== FW3_FAMILY_V6
)
827 xtables_parse_interface(in
->name
, r
->e6
.ipv6
.iniface
,
828 r
->e6
.ipv6
.iniface_mask
);
831 r
->e6
.ipv6
.invflags
|= IP6T_INV_VIA_IN
;
834 if (out
&& !out
->any
)
836 xtables_parse_interface(out
->name
, r
->e6
.ipv6
.outiface
,
837 r
->e6
.ipv6
.outiface_mask
);
840 r
->e6
.ipv6
.invflags
|= IP6T_INV_VIA_OUT
;
848 xtables_parse_interface(in
->name
, r
->e
.ip
.iniface
,
849 r
->e
.ip
.iniface_mask
);
852 r
->e
.ip
.invflags
|= IPT_INV_VIA_IN
;
855 if (out
&& !out
->any
)
857 xtables_parse_interface(out
->name
, r
->e
.ip
.outiface
,
858 r
->e
.ip
.outiface_mask
);
861 r
->e
.ip
.invflags
|= IPT_INV_VIA_OUT
;
868 fw3_ipt_rule_src_dest(struct fw3_ipt_rule
*r
,
869 struct fw3_address
*src
, struct fw3_address
*dest
)
871 if ((src
&& src
->range
) || (dest
&& dest
->range
))
873 fw3_ipt_rule_addarg(r
, false, "-m", "iprange");
880 fw3_ipt_rule_addarg(r
, src
->invert
, "--src-range",
881 fw3_address_to_string(src
, false, false));
884 else if (r
->h
->family
== FW3_FAMILY_V6
)
886 r
->e6
.ipv6
.src
= src
->address
.v6
;
887 r
->e6
.ipv6
.smsk
= src
->mask
.v6
;
890 for (i
= 0; i
< 4; i
++)
891 r
->e6
.ipv6
.src
.s6_addr32
[i
] &= r
->e6
.ipv6
.smsk
.s6_addr32
[i
];
894 r
->e6
.ipv6
.invflags
|= IP6T_INV_SRCIP
;
899 r
->e
.ip
.src
= src
->address
.v4
;
900 r
->e
.ip
.smsk
= src
->mask
.v4
;
902 r
->e
.ip
.src
.s_addr
&= r
->e
.ip
.smsk
.s_addr
;
905 r
->e
.ip
.invflags
|= IPT_INV_SRCIP
;
909 if (dest
&& dest
->set
)
913 fw3_ipt_rule_addarg(r
, dest
->invert
, "--dst-range",
914 fw3_address_to_string(dest
, false, false));
917 else if (r
->h
->family
== FW3_FAMILY_V6
)
919 r
->e6
.ipv6
.dst
= dest
->address
.v6
;
920 r
->e6
.ipv6
.dmsk
= dest
->mask
.v6
;
923 for (i
= 0; i
< 4; i
++)
924 r
->e6
.ipv6
.dst
.s6_addr32
[i
] &= r
->e6
.ipv6
.dmsk
.s6_addr32
[i
];
927 r
->e6
.ipv6
.invflags
|= IP6T_INV_DSTIP
;
932 r
->e
.ip
.dst
= dest
->address
.v4
;
933 r
->e
.ip
.dmsk
= dest
->mask
.v4
;
935 r
->e
.ip
.dst
.s_addr
&= r
->e
.ip
.dmsk
.s_addr
;
938 r
->e
.ip
.invflags
|= IPT_INV_DSTIP
;
944 fw3_ipt_rule_sport_dport(struct fw3_ipt_rule
*r
,
945 struct fw3_port
*sp
, struct fw3_port
*dp
)
947 char buf
[sizeof("65535:65535")];
949 if ((!sp
|| !sp
->set
) && (!dp
|| !dp
->set
))
952 if (!get_protoname(r
))
957 if (sp
->port_min
== sp
->port_max
)
958 snprintf(buf
, sizeof(buf
), "%u", sp
->port_min
);
960 snprintf(buf
, sizeof(buf
), "%u:%u", sp
->port_min
, sp
->port_max
);
962 fw3_ipt_rule_addarg(r
, sp
->invert
, "--sport", buf
);
967 if (dp
->port_min
== dp
->port_max
)
968 snprintf(buf
, sizeof(buf
), "%u", dp
->port_min
);
970 snprintf(buf
, sizeof(buf
), "%u:%u", dp
->port_min
, dp
->port_max
);
972 fw3_ipt_rule_addarg(r
, dp
->invert
, "--dport", buf
);
977 fw3_ipt_rule_device(struct fw3_ipt_rule
*r
, const char *device
, bool out
)
979 struct fw3_device dev
= { .any
= false };
982 snprintf(dev
.name
, sizeof(dev
.name
), "%s", device
);
983 fw3_ipt_rule_in_out(r
, (out
) ? NULL
: &dev
, (out
) ? &dev
: NULL
);
988 fw3_ipt_rule_mac(struct fw3_ipt_rule
*r
, struct fw3_mac
*mac
)
990 char buf
[sizeof("ff:ff:ff:ff:ff:ff")];
991 uint8_t *addr
= mac
->mac
.ether_addr_octet
;
996 snprintf(buf
, sizeof(buf
), "%02x:%02x:%02x:%02x:%02x:%02x",
997 addr
[0], addr
[1], addr
[2], addr
[3], addr
[4], addr
[5]);
999 fw3_ipt_rule_addarg(r
, false, "-m", "mac");
1000 fw3_ipt_rule_addarg(r
, mac
->invert
, "--mac-source", buf
);
1004 fw3_ipt_rule_icmptype(struct fw3_ipt_rule
*r
, struct fw3_icmptype
*icmp
)
1006 char buf
[sizeof("255/255")];
1011 #ifndef DISABLE_IPV6
1012 if (r
->h
->family
== FW3_FAMILY_V6
)
1014 if (icmp
->code6_min
== 0 && icmp
->code6_max
== 0xFF)
1015 snprintf(buf
, sizeof(buf
), "%u", icmp
->type6
);
1017 snprintf(buf
, sizeof(buf
), "%u/%u", icmp
->type6
, icmp
->code6_min
);
1019 fw3_ipt_rule_addarg(r
, icmp
->invert
, "--icmpv6-type", buf
);
1024 if (icmp
->code_min
== 0 && icmp
->code_max
== 0xFF)
1025 snprintf(buf
, sizeof(buf
), "%u", icmp
->type
);
1027 snprintf(buf
, sizeof(buf
), "%u/%u", icmp
->type
, icmp
->code_min
);
1029 fw3_ipt_rule_addarg(r
, icmp
->invert
, "--icmp-type", buf
);
1034 fw3_ipt_rule_limit(struct fw3_ipt_rule
*r
, struct fw3_limit
*limit
)
1036 char buf
[sizeof("-4294967296/second")];
1038 if (!limit
|| limit
->rate
<= 0)
1041 fw3_ipt_rule_addarg(r
, false, "-m", "limit");
1043 snprintf(buf
, sizeof(buf
), "%u/%s", limit
->rate
, fw3_limit_units
[limit
->unit
]);
1044 fw3_ipt_rule_addarg(r
, limit
->invert
, "--limit", buf
);
1046 if (limit
->burst
> 0)
1048 snprintf(buf
, sizeof(buf
), "%u", limit
->burst
);
1049 fw3_ipt_rule_addarg(r
, limit
->invert
, "--limit-burst", buf
);
1054 fw3_ipt_rule_ipset(struct fw3_ipt_rule
*r
, struct fw3_setmatch
*match
)
1056 char buf
[sizeof("dst,dst,dst")];
1059 size_t rem
= sizeof(buf
);
1061 struct fw3_ipset
*set
;
1062 struct fw3_ipset_datatype
*type
;
1064 if (!match
|| !match
->set
|| !match
->ptr
)
1068 list_for_each_entry(type
, &set
->datatypes
, list
)
1082 len
= snprintf(p
, rem
, "%s", match
->dir
[i
] ? match
->dir
[i
] : type
->dir
);
1084 if (len
< 0 || len
>= rem
)
1093 fw3_ipt_rule_addarg(r
, false, "-m", "set");
1095 fw3_ipt_rule_addarg(r
, match
->invert
, "--match-set",
1096 set
->external
? set
->external
: set
->name
);
1098 fw3_ipt_rule_addarg(r
, false, buf
, NULL
);
1102 fw3_ipt_rule_helper(struct fw3_ipt_rule
*r
, struct fw3_cthelpermatch
*match
)
1104 if (!match
|| !match
->set
|| !match
->ptr
)
1107 fw3_ipt_rule_addarg(r
, false, "-m", "helper");
1108 fw3_ipt_rule_addarg(r
, match
->invert
, "--helper", match
->ptr
->name
);
1112 fw3_ipt_rule_time(struct fw3_ipt_rule
*r
, struct fw3_time
*time
)
1115 struct tm empty
= { 0 };
1117 char buf
[84]; /* sizeof("1,2,3,...,30,31") */
1120 bool d1
= memcmp(&time
->datestart
, &empty
, sizeof(empty
));
1121 bool d2
= memcmp(&time
->datestop
, &empty
, sizeof(empty
));
1125 if (!d1
&& !d2
&& !time
->timestart
&& !time
->timestop
&&
1126 !(time
->monthdays
& 0xFFFFFFFE) && !(time
->weekdays
& 0xFE))
1131 fw3_ipt_rule_addarg(r
, false, "-m", "time");
1134 fw3_ipt_rule_addarg(r
, false, "--kerneltz", NULL
);
1138 strftime(buf
, sizeof(buf
), "%Y-%m-%dT%H:%M:%S", &time
->datestart
);
1139 fw3_ipt_rule_addarg(r
, false, "--datestart", buf
);
1144 strftime(buf
, sizeof(buf
), "%Y-%m-%dT%H:%M:%S", &time
->datestop
);
1145 fw3_ipt_rule_addarg(r
, false, "--datestop", buf
);
1148 if (time
->timestart
)
1150 snprintf(buf
, sizeof(buf
), "%02d:%02d:%02d",
1151 time
->timestart
/ 3600,
1152 time
->timestart
% 3600 / 60,
1153 time
->timestart
% 60);
1155 fw3_ipt_rule_addarg(r
, false, "--timestart", buf
);
1160 snprintf(buf
, sizeof(buf
), "%02d:%02d:%02d",
1161 time
->timestop
/ 3600,
1162 time
->timestop
% 3600 / 60,
1163 time
->timestop
% 60);
1165 fw3_ipt_rule_addarg(r
, false, "--timestop", buf
);
1168 if (time
->monthdays
& 0xFFFFFFFE)
1170 for (i
= 1, p
= buf
, rem
= sizeof(buf
); i
< 32; i
++)
1172 if (fw3_hasbit(time
->monthdays
, i
))
1183 len
= snprintf(p
, rem
, "%u", i
);
1185 if (len
< 0 || len
>= rem
)
1193 fw3_ipt_rule_addarg(r
, fw3_hasbit(time
->monthdays
, 0), "--monthdays", buf
);
1196 if (time
->weekdays
& 0xFE)
1198 for (i
= 1, p
= buf
, rem
= sizeof(buf
); i
< 8; i
++)
1200 if (fw3_hasbit(time
->weekdays
, i
))
1211 len
= snprintf(p
, rem
, "%u", i
);
1213 if (len
< 0 || len
>= rem
)
1221 fw3_ipt_rule_addarg(r
, fw3_hasbit(time
->weekdays
, 0), "--weekdays", buf
);
1226 fw3_ipt_rule_mark(struct fw3_ipt_rule
*r
, struct fw3_mark
*mark
)
1228 char buf
[sizeof("0xFFFFFFFF/0xFFFFFFFF")];
1230 if (!mark
|| !mark
->set
)
1233 if (mark
->mask
< 0xFFFFFFFF)
1234 snprintf(buf
, sizeof(buf
), "0x%x/0x%x", mark
->mark
, mark
->mask
);
1236 snprintf(buf
, sizeof(buf
), "0x%x", mark
->mark
);
1238 fw3_ipt_rule_addarg(r
, false, "-m", "mark");
1239 fw3_ipt_rule_addarg(r
, mark
->invert
, "--mark", buf
);
1243 fw3_ipt_rule_dscp(struct fw3_ipt_rule
*r
, struct fw3_dscp
*dscp
)
1245 char buf
[sizeof("0xFF")];
1247 if (!dscp
|| !dscp
->set
)
1250 snprintf(buf
, sizeof(buf
), "0x%x", dscp
->dscp
);
1252 fw3_ipt_rule_addarg(r
, false, "-m", "dscp");
1253 fw3_ipt_rule_addarg(r
, dscp
->invert
, "--dscp", buf
);
1257 fw3_ipt_rule_comment(struct fw3_ipt_rule
*r
, const char *fmt
, ...)
1266 vsnprintf(buf
, sizeof(buf
), fmt
, ap
);
1269 fw3_ipt_rule_addarg(r
, false, "-m", "comment");
1270 fw3_ipt_rule_addarg(r
, false, "--comment", buf
);
1274 fw3_ipt_rule_extra(struct fw3_ipt_rule
*r
, const char *extra
)
1278 if (!extra
|| !*extra
)
1281 s
= fw3_strdup(extra
);
1283 for (p
= strtok(s
, " \t"); p
; p
= strtok(NULL
, " \t"))
1285 tmp
= realloc(r
->argv
, (r
->argc
+ 1) * sizeof(*r
->argv
));
1291 r
->argv
[r
->argc
++] = fw3_strdup(p
);
1297 #ifndef DISABLE_IPV6
1299 rule_print6(struct ip6t_entry
*e
)
1301 char buf1
[INET6_ADDRSTRLEN
], buf2
[INET6_ADDRSTRLEN
];
1304 if (e
->ipv6
.flags
& IP6T_F_PROTO
)
1306 if (e
->ipv6
.invflags
& XT_INV_PROTO
)
1309 pname
= get_protoname(container_of(e
, struct fw3_ipt_rule
, e6
));
1312 printf(" -p %s", pname
);
1314 printf(" -p %u", e
->ipv6
.proto
);
1317 if (e
->ipv6
.iniface
[0])
1319 if (e
->ipv6
.invflags
& IP6T_INV_VIA_IN
)
1322 printf(" -i %s", e
->ipv6
.iniface
);
1325 if (e
->ipv6
.outiface
[0])
1327 if (e
->ipv6
.invflags
& IP6T_INV_VIA_OUT
)
1330 printf(" -o %s", e
->ipv6
.outiface
);
1333 if (memcmp(&e
->ipv6
.src
, &in6addr_any
, sizeof(struct in6_addr
)))
1335 if (e
->ipv6
.invflags
& IP6T_INV_SRCIP
)
1339 inet_ntop(AF_INET6
, &e
->ipv6
.src
, buf1
, sizeof(buf1
)),
1340 inet_ntop(AF_INET6
, &e
->ipv6
.smsk
, buf2
, sizeof(buf2
)));
1343 if (memcmp(&e
->ipv6
.dst
, &in6addr_any
, sizeof(struct in6_addr
)))
1345 if (e
->ipv6
.invflags
& IP6T_INV_DSTIP
)
1349 inet_ntop(AF_INET6
, &e
->ipv6
.dst
, buf1
, sizeof(buf1
)),
1350 inet_ntop(AF_INET6
, &e
->ipv6
.dmsk
, buf2
, sizeof(buf2
)));
1356 rule_print4(struct ipt_entry
*e
)
1358 struct in_addr in_zero
= { 0 };
1359 char buf1
[sizeof("255.255.255.255")], buf2
[sizeof("255.255.255.255")];
1364 if (e
->ip
.invflags
& XT_INV_PROTO
)
1367 pname
= get_protoname(container_of(e
, struct fw3_ipt_rule
, e
));
1370 printf(" -p %s", pname
);
1372 printf(" -p %u", e
->ip
.proto
);
1375 if (e
->ip
.iniface
[0])
1377 if (e
->ip
.invflags
& IPT_INV_VIA_IN
)
1380 printf(" -i %s", e
->ip
.iniface
);
1383 if (e
->ip
.outiface
[0])
1385 if (e
->ip
.invflags
& IPT_INV_VIA_OUT
)
1388 printf(" -o %s", e
->ip
.outiface
);
1391 if (memcmp(&e
->ip
.src
, &in_zero
, sizeof(struct in_addr
)))
1393 if (e
->ip
.invflags
& IPT_INV_SRCIP
)
1397 inet_ntop(AF_INET
, &e
->ip
.src
, buf1
, sizeof(buf1
)),
1398 inet_ntop(AF_INET
, &e
->ip
.smsk
, buf2
, sizeof(buf2
)));
1401 if (memcmp(&e
->ip
.dst
, &in_zero
, sizeof(struct in_addr
)))
1403 if (e
->ip
.invflags
& IPT_INV_DSTIP
)
1407 inet_ntop(AF_INET
, &e
->ip
.dst
, buf1
, sizeof(buf1
)),
1408 inet_ntop(AF_INET
, &e
->ip
.dmsk
, buf2
, sizeof(buf2
)));
1413 rule_print(struct fw3_ipt_rule
*r
, const char *prefix
, const char *chain
)
1415 debug(r
->h
, "%s %s", prefix
, chain
);
1417 #ifndef DISABLE_IPV6
1418 if (r
->h
->family
== FW3_FAMILY_V6
)
1419 rule_print6(&r
->e6
);
1424 fw3_xt_print_matches(&r
->e
.ip
, r
->matches
);
1425 fw3_xt_print_target(&r
->e
.ip
, r
->target
);
1431 parse_option(struct fw3_ipt_rule
*r
, int optc
, bool inv
)
1433 struct xtables_rule_match
*m
;
1434 struct xtables_match
*em
;
1436 /* is a target option */
1437 if (r
->target
&& fw3_xt_has_target_parse(r
->target
) &&
1438 optc
>= r
->target
->option_offset
&&
1439 optc
< (r
->target
->option_offset
+ 256))
1441 xtables_option_tpcall(optc
, r
->argv
, inv
, r
->target
, &r
->e
);
1445 /* try to dispatch argument to one of the match parsers */
1446 for (m
= r
->matches
; m
; m
= m
->next
)
1450 if (m
->completed
|| !fw3_xt_has_match_parse(em
))
1453 if (optc
< em
->option_offset
||
1454 optc
>= (em
->option_offset
+ 256))
1457 xtables_option_mpcall(optc
, r
->argv
, inv
, em
, &r
->e
);
1461 /* unhandled option, might belong to a protocol match */
1462 if ((em
= load_protomatch(r
)) != NULL
)
1464 init_match(r
, em
, false);
1466 r
->protocol_loaded
= true;
1473 warn("parse_option(): option '%s' needs argument", r
->argv
[optind
-1]);
1476 warn("parse_option(): unknown option '%s'", r
->argv
[optind
-1]);
1482 fw3_ipt_rule_addarg(struct fw3_ipt_rule
*r
, bool inv
,
1483 const char *k
, const char *v
)
1491 n
= inv
+ !!k
+ !!v
;
1492 tmp
= realloc(r
->argv
, (r
->argc
+ n
) * sizeof(*tmp
));
1500 r
->argv
[r
->argc
++] = fw3_strdup("!");
1502 r
->argv
[r
->argc
++] = fw3_strdup(k
);
1505 r
->argv
[r
->argc
++] = fw3_strdup(v
);
1508 static unsigned char *
1509 rule_mask(struct fw3_ipt_rule
*r
)
1512 unsigned char *p
, *mask
= NULL
;
1513 struct xtables_rule_match
*m
;
1515 #define SZ(x) XT_ALIGN(sizeof(struct x))
1517 #ifndef DISABLE_IPV6
1518 if (r
->h
->family
== FW3_FAMILY_V6
)
1522 for (m
= r
->matches
; m
; m
= m
->next
)
1523 s
+= SZ(ip6t_entry_match
) + m
->match
->size
;
1525 s
+= SZ(ip6t_entry_target
);
1527 s
+= r
->target
->size
;
1529 mask
= fw3_alloc(s
);
1530 memset(mask
, 0xFF, SZ(ip6t_entry
));
1531 p
= mask
+ SZ(ip6t_entry
);
1533 for (m
= r
->matches
; m
; m
= m
->next
)
1535 memset(p
, 0xFF, SZ(ip6t_entry_match
) + m
->match
->userspacesize
);
1536 p
+= SZ(ip6t_entry_match
) + m
->match
->size
;
1539 memset(p
, 0xFF, SZ(ip6t_entry_target
) + (r
->target
? r
->target
->userspacesize
: 0));
1546 for (m
= r
->matches
; m
; m
= m
->next
)
1547 s
+= SZ(ipt_entry_match
) + m
->match
->size
;
1549 s
+= SZ(ipt_entry_target
);
1551 s
+= r
->target
->size
;
1553 mask
= fw3_alloc(s
);
1554 memset(mask
, 0xFF, SZ(ipt_entry
));
1555 p
= mask
+ SZ(ipt_entry
);
1557 for (m
= r
->matches
; m
; m
= m
->next
)
1559 memset(p
, 0xFF, SZ(ipt_entry_match
) + m
->match
->userspacesize
);
1560 p
+= SZ(ipt_entry_match
) + m
->match
->size
;
1563 memset(p
, 0xFF, SZ(ipt_entry_target
) + (r
->target
? r
->target
->userspacesize
: 0));
1570 rule_build(struct fw3_ipt_rule
*r
)
1572 size_t s
, target_size
= (r
->target
) ? r
->target
->t
->u
.target_size
: 0;
1573 struct xtables_rule_match
*m
;
1575 #ifndef DISABLE_IPV6
1576 if (r
->h
->family
== FW3_FAMILY_V6
)
1578 struct ip6t_entry
*e6
;
1580 s
= XT_ALIGN(sizeof(struct ip6t_entry
));
1582 for (m
= r
->matches
; m
; m
= m
->next
)
1583 s
+= m
->match
->m
->u
.match_size
;
1585 e6
= fw3_alloc(s
+ target_size
);
1587 memcpy(e6
, &r
->e6
, sizeof(struct ip6t_entry
));
1589 e6
->target_offset
= s
;
1590 e6
->next_offset
= s
+ target_size
;
1594 for (m
= r
->matches
; m
; m
= m
->next
)
1596 memcpy(e6
->elems
+ s
, m
->match
->m
, m
->match
->m
->u
.match_size
);
1597 s
+= m
->match
->m
->u
.match_size
;
1601 memcpy(e6
->elems
+ s
, r
->target
->t
, target_size
);
1608 struct ipt_entry
*e
;
1610 s
= XT_ALIGN(sizeof(struct ipt_entry
));
1612 for (m
= r
->matches
; m
; m
= m
->next
)
1613 s
+= m
->match
->m
->u
.match_size
;
1615 e
= fw3_alloc(s
+ target_size
);
1617 memcpy(e
, &r
->e
, sizeof(struct ipt_entry
));
1619 e
->target_offset
= s
;
1620 e
->next_offset
= s
+ target_size
;
1624 for (m
= r
->matches
; m
; m
= m
->next
)
1626 memcpy(e
->elems
+ s
, m
->match
->m
, m
->match
->m
->u
.match_size
);
1627 s
+= m
->match
->m
->u
.match_size
;
1631 memcpy(e
->elems
+ s
, r
->target
->t
, target_size
);
1638 set_rule_tag(struct fw3_ipt_rule
*r
)
1642 const char *tag
= "!fw3";
1644 for (i
= 0; i
< r
->argc
; i
++)
1645 if (!strcmp(r
->argv
[i
], "--comment") && (i
+ 1) < r
->argc
)
1646 if (asprintf(&p
, "%s: %s", tag
, r
->argv
[i
+ 1]) > 0)
1648 free(r
->argv
[i
+ 1]);
1653 tmp
= realloc(r
->argv
, (r
->argc
+ 4) * sizeof(*r
->argv
));
1658 r
->argv
[r
->argc
++] = fw3_strdup("-m");
1659 r
->argv
[r
->argc
++] = fw3_strdup("comment");
1660 r
->argv
[r
->argc
++] = fw3_strdup("--comment");
1661 r
->argv
[r
->argc
++] = fw3_strdup(tag
);
1666 __fw3_ipt_rule_append(struct fw3_ipt_rule
*r
, bool repl
, const char *fmt
, ...)
1669 unsigned char *mask
;
1671 struct xtables_rule_match
*m
;
1672 struct xtables_match
*em
;
1673 struct xtables_target
*et
;
1674 struct xtables_globals
*g
;
1676 struct fw3_device dev
;
1677 struct fw3_address addr
;
1679 enum xtables_exittype status
;
1687 vsnprintf(buf
, sizeof(buf
) - 1, fmt
, ap
);
1690 g
= (r
->h
->family
== FW3_FAMILY_V6
) ? &xtg6
: &xtg
;
1691 g
->opts
= g
->orig_opts
;
1696 status
= setjmp(fw3_ipt_error_jmp
);
1700 info(" ! Skipping due to previous exception (code %u)", status
);
1706 while ((optc
= getopt_long(r
->argc
, r
->argv
, "-:m:j:i:o:s:d:", g
->opts
,
1712 em
= find_match(r
, optarg
);
1716 warn("fw3_ipt_rule_append(): Can't find match '%s'", optarg
);
1720 init_match(r
, em
, true);
1724 et
= get_target(r
, optarg
);
1728 warn("fw3_ipt_rule_append(): Can't find target '%s'", optarg
);
1736 if (!fw3_parse_device(&dev
, optarg
, false) ||
1737 dev
.any
|| dev
.invert
|| *dev
.network
)
1739 warn("fw3_ipt_rule_append(): Bad argument '%s'", optarg
);
1744 fw3_ipt_rule_in_out(r
, (optc
== 'i') ? &dev
: NULL
,
1745 (optc
== 'o') ? &dev
: NULL
);
1750 if (!fw3_parse_address(&addr
, optarg
, false) ||
1751 addr
.range
|| addr
.invert
)
1753 warn("fw3_ipt_rule_append(): Bad argument '%s'", optarg
);
1758 fw3_ipt_rule_src_dest(r
, (optc
== 's') ? &addr
: NULL
,
1759 (optc
== 'd') ? &addr
: NULL
);
1763 if ((optarg
[0] == '!') && (optarg
[1] == '\0'))
1770 warn("fw3_ipt_rule_append(): Bad argument '%s'", optarg
);
1774 if (parse_option(r
, optc
, inv
))
1782 for (m
= r
->matches
; m
; m
= m
->next
)
1783 xtables_option_mfcall(m
->match
);
1786 xtables_option_tfcall(r
->target
);
1788 rule
= rule_build(r
);
1790 #ifndef DISABLE_IPV6
1791 if (r
->h
->family
== FW3_FAMILY_V6
)
1795 mask
= rule_mask(r
);
1797 while (ip6tc_delete_entry(buf
, rule
, mask
, r
->h
->handle
))
1799 rule_print(r
, "-D", buf
);
1805 rule_print(r
, "-A", buf
);
1807 if (!ip6tc_append_entry(buf
, rule
, r
->h
->handle
))
1808 warn("ip6tc_append_entry(): %s", ip6tc_strerror(errno
));
1815 mask
= rule_mask(r
);
1817 while (iptc_delete_entry(buf
, rule
, mask
, r
->h
->handle
))
1819 rule_print(r
, "-D", buf
);
1825 rule_print(r
, "-A", buf
);
1827 if (!iptc_append_entry(buf
, rule
, r
->h
->handle
))
1828 warn("iptc_append_entry(): %s\n", iptc_strerror(errno
));
1834 for (i
= 1; i
< r
->argc
; i
++)
1839 xtables_rule_matches_free(&r
->matches
);
1846 /* reset all targets and matches */
1847 for (em
= xtables_matches
; em
; em
= em
->next
)
1850 for (et
= xtables_targets
; et
; et
= et
->next
)
1856 xtables_free_opts(1);
1859 struct fw3_ipt_rule
*
1860 fw3_ipt_rule_create(struct fw3_ipt_handle
*handle
, struct fw3_protocol
*proto
,
1861 struct fw3_device
*in
, struct fw3_device
*out
,
1862 struct fw3_address
*src
, struct fw3_address
*dest
)
1864 struct fw3_ipt_rule
*r
;
1866 r
= fw3_ipt_rule_new(handle
);
1868 fw3_ipt_rule_proto(r
, proto
);
1869 fw3_ipt_rule_in_out(r
, in
, out
);
1870 fw3_ipt_rule_src_dest(r
, src
, dest
);
1876 xtables_register_match(struct xtables_match
*me
)
1879 static struct xtables_match
**tmp
;
1881 if (!xext
.register_match
)
1882 xext
.register_match
= dlsym(RTLD_NEXT
, "xtables_register_match");
1884 if (!xext
.register_match
)
1887 xext
.register_match(me
);
1891 for (i
= 0; i
< xext
.mcount
; i
++)
1892 if (xext
.matches
[i
] == me
)
1895 tmp
= realloc(xext
.matches
, sizeof(me
) * (xext
.mcount
+ 1));
1901 xext
.matches
[xext
.mcount
++] = me
;
1906 xtables_register_target(struct xtables_target
*me
)
1909 static struct xtables_target
**tmp
;
1911 if (!xext
.register_target
)
1912 xext
.register_target
= dlsym(RTLD_NEXT
, "xtables_register_target");
1914 if (!xext
.register_target
)
1917 xext
.register_target(me
);
1921 for (i
= 0; i
< xext
.tcount
; i
++)
1922 if (xext
.targets
[i
] == me
)
1925 tmp
= realloc(xext
.targets
, sizeof(me
) * (xext
.tcount
+ 1));
1931 xext
.targets
[xext
.tcount
++] = me
;