fc6bbd7a3ec82d93f66aaf051bcfe556f1f98573
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 #include <sys/ioctl.h>
31 static int lock_fd
= -1;
32 static pid_t pipe_pid
= -1;
33 static FILE *pipe_fd
= NULL
;
35 bool fw3_pr_debug
= false;
39 warn_elem_section_name(struct uci_section
*s
, bool find_name
)
43 struct uci_element
*tmp
;
47 uci_foreach_element(&s
->package
->sections
, tmp
)
49 if (strcmp(uci_to_section(tmp
)->type
, s
->type
))
58 fprintf(stderr
, "@%s[%d]", s
->type
, i
);
62 uci_foreach_element(&s
->options
, tmp
)
64 o
= uci_to_option(tmp
);
66 if (!strcmp(tmp
->name
, "name") && (o
->type
== UCI_TYPE_STRING
))
68 fprintf(stderr
, " (%s)", o
->v
.string
);
76 fprintf(stderr
, "'%s'", s
->e
.name
);
84 warn_elem(struct uci_element
*e
, const char *format
, ...)
86 if (e
->type
== UCI_TYPE_SECTION
)
88 fprintf(stderr
, "Warning: Section ");
89 warn_elem_section_name(uci_to_section(e
), true);
91 else if (e
->type
== UCI_TYPE_OPTION
)
93 fprintf(stderr
, "Warning: Option ");
94 warn_elem_section_name(uci_to_option(e
)->section
, false);
95 fprintf(stderr
, ".%s ", e
->name
);
99 va_start(argptr
, format
);
100 vfprintf(stderr
, format
, argptr
);
103 fprintf(stderr
, "\n");
107 warn(const char* format
, ...)
109 fprintf(stderr
, "Warning: ");
111 va_start(argptr
, format
);
112 vfprintf(stderr
, format
, argptr
);
114 fprintf(stderr
, "\n");
118 error(const char* format
, ...)
120 fprintf(stderr
, "Error: ");
122 va_start(argptr
, format
);
123 vfprintf(stderr
, format
, argptr
);
125 fprintf(stderr
, "\n");
131 info(const char* format
, ...)
134 va_start(argptr
, format
);
135 vfprintf(stderr
, format
, argptr
);
137 fprintf(stderr
, "\n");
141 fw3_alloc(size_t size
)
145 mem
= calloc(1, size
);
148 error("Out of memory while allocating %d bytes", size
);
154 fw3_strdup(const char *s
)
161 error("Out of memory while duplicating string '%s'", s
);
167 fw3_find_command(const char *cmd
)
170 int plen
= 0, clen
= strlen(cmd
) + 1;
172 static char path
[PATH_MAX
];
174 if (!stat(cmd
, &s
) && S_ISREG(s
.st_mode
))
177 search
= getenv("PATH");
180 search
= "/bin:/usr/bin:/sbin:/usr/sbin";
186 if (*p
!= ':' && *p
!= '\0')
191 if ((plen
+ clen
) >= sizeof(path
))
194 strncpy(path
, search
, plen
);
195 sprintf(path
+ plen
, "/%s", cmd
);
197 if (!stat(path
, &s
) && S_ISREG(s
.st_mode
))
208 fw3_stdout_pipe(void)
215 __fw3_command_pipe(bool silent
, const char *command
, ...)
221 char *arg
, **args
, **tmp
;
223 command
= fw3_find_command(command
);
232 args
= calloc(argn
, sizeof(arg
));
237 args
[0] = (char *)command
;
240 va_start(argp
, command
);
242 while ((arg
= va_arg(argp
, char *)) != NULL
)
244 tmp
= realloc(args
, ++argn
* sizeof(arg
));
256 switch ((pid
= fork()))
273 execv(command
, args
);
276 signal(SIGPIPE
, SIG_IGN
);
279 fcntl(pfds
[1], F_SETFD
, fcntl(pfds
[1], F_GETFD
) | FD_CLOEXEC
);
282 pipe_fd
= fdopen(pfds
[1], "w");
288 fw3_pr(const char *fmt
, ...)
292 if (fw3_pr_debug
&& pipe_fd
!= stdout
)
295 vfprintf(stderr
, fmt
, args
);
300 vfprintf(pipe_fd
, fmt
, args
);
305 fw3_command_close(void)
307 if (pipe_fd
&& pipe_fd
!= stdout
)
311 waitpid(pipe_pid
, NULL
, 0);
313 signal(SIGPIPE
, SIG_DFL
);
320 fw3_has_table(bool ipv6
, const char *table
)
327 const char *path
= ipv6
328 ? "/proc/net/ip6_tables_names" : "/proc/net/ip_tables_names";
330 if (!(f
= fopen(path
, "r")))
333 while (fgets(line
, sizeof(line
), f
))
335 if (!strncmp(line
, table
, strlen(table
)))
351 lock_fd
= open(FW3_LOCKFILE
, O_CREAT
|O_WRONLY
, S_IRUSR
|S_IWUSR
);
355 warn("Cannot create lock file %s: %s", FW3_LOCKFILE
, strerror(errno
));
359 if (flock(lock_fd
, LOCK_EX
))
361 warn("Cannot acquire exclusive lock: %s", strerror(errno
));
374 if (flock(lock_fd
, LOCK_UN
))
375 warn("Cannot release exclusive lock: %s", strerror(errno
));
378 unlink(FW3_LOCKFILE
);
385 write_defaults_uci(struct uci_context
*ctx
, struct fw3_defaults
*d
,
386 struct uci_package
*dest
)
388 char buf
[sizeof("0xffffffff\0")];
389 struct uci_ptr ptr
= { .p
= dest
};
391 uci_add_section(ctx
, dest
, "defaults", &ptr
.s
);
394 ptr
.option
= "input";
395 ptr
.value
= fw3_flag_names
[d
->policy_input
];
399 ptr
.option
= "output";
400 ptr
.value
= fw3_flag_names
[d
->policy_output
];
404 ptr
.option
= "forward";
405 ptr
.value
= fw3_flag_names
[d
->policy_forward
];
408 sprintf(buf
, "0x%x", d
->flags
[0]);
410 ptr
.option
= "__flags_v4";
414 sprintf(buf
, "0x%x", d
->flags
[1]);
416 ptr
.option
= "__flags_v6";
422 write_zone_uci(struct uci_context
*ctx
, struct fw3_zone
*z
,
423 struct uci_package
*dest
, struct ifaddrs
*ifaddr
)
425 struct fw3_device
*dev
;
426 struct fw3_address
*sub
;
428 enum fw3_family fam
= FW3_FAMILY_ANY
;
430 char *p
, buf
[INET6_ADDRSTRLEN
];
432 struct uci_ptr ptr
= { .p
= dest
};
437 if (fw3_no_table(z
->flags
[0]) && !fw3_no_table(z
->flags
[1]))
439 else if (!fw3_no_table(z
->flags
[0]) && fw3_no_table(z
->flags
[1]))
441 else if (fw3_no_table(z
->flags
[0]) && fw3_no_table(z
->flags
[1]))
444 uci_add_section(ctx
, dest
, "zone", &ptr
.s
);
452 ptr
.option
= "input";
453 ptr
.value
= fw3_flag_names
[z
->policy_input
];
457 ptr
.option
= "output";
458 ptr
.value
= fw3_flag_names
[z
->policy_output
];
462 ptr
.option
= "forward";
463 ptr
.value
= fw3_flag_names
[z
->policy_forward
];
468 ptr
.value
= z
->masq
? "1" : "0";
472 ptr
.option
= "mtu_fix";
473 ptr
.value
= z
->mtu_fix
? "1" : "0";
477 ptr
.option
= "custom_chains";
478 ptr
.value
= z
->custom_chains
? "1" : "0";
481 if (fam
!= FW3_FAMILY_ANY
)
484 ptr
.option
= "family";
485 ptr
.value
= fw3_flag_names
[fam
];
490 ptr
.option
= "device";
492 fw3_foreach(dev
, &z
->devices
)
500 ep
= buf
+ sizeof(buf
);
503 p
+= snprintf(p
, ep
- p
, "!");
506 p
+= snprintf(p
, ep
- p
, "%s@%s", dev
->name
, dev
->network
);
508 p
+= snprintf(p
, ep
- p
, "%s", dev
->name
);
511 uci_add_list(ctx
, &ptr
);
515 ptr
.option
= "subnet";
517 fw3_foreach(sub
, &z
->subnets
)
522 ptr
.value
= fw3_address_to_string(sub
, true, false);
523 uci_add_list(ctx
, &ptr
);
527 ptr
.option
= "__addrs";
529 fw3_foreach(dev
, &z
->devices
)
534 for (ifa
= ifaddr
; ifa
; ifa
= ifa
->ifa_next
)
536 if (!ifa
->ifa_addr
|| strcmp(dev
->name
, ifa
->ifa_name
))
539 if (ifa
->ifa_addr
->sa_family
== AF_INET
)
541 &((struct sockaddr_in
*)ifa
->ifa_addr
)->sin_addr
,
543 else if (ifa
->ifa_addr
->sa_family
== AF_INET6
)
545 &((struct sockaddr_in6
*)ifa
->ifa_addr
)->sin6_addr
,
551 uci_add_list(ctx
, &ptr
);
555 sprintf(buf
, "0x%x", z
->flags
[0]);
557 ptr
.option
= "__flags_v4";
561 sprintf(buf
, "0x%x", z
->flags
[1]);
563 ptr
.option
= "__flags_v6";
569 write_ipset_uci(struct uci_context
*ctx
, struct fw3_ipset
*s
,
570 struct uci_package
*dest
)
572 struct fw3_ipset_datatype
*type
;
574 char buf
[sizeof("65535-65535\0")];
576 struct uci_ptr ptr
= { .p
= dest
};
578 if (!s
->enabled
|| s
->external
)
581 uci_add_section(ctx
, dest
, "ipset", &ptr
.s
);
589 ptr
.option
= "storage";
590 ptr
.value
= fw3_ipset_method_names
[s
->method
];
593 list_for_each_entry(type
, &s
->datatypes
, list
)
595 sprintf(buf
, "%s_%s", type
->dir
, fw3_ipset_type_names
[type
->type
]);
597 ptr
.option
= "match";
599 uci_add_list(ctx
, &ptr
);
605 ptr
.option
= "iprange";
606 ptr
.value
= fw3_address_to_string(&s
->iprange
, false, false);
610 if (s
->portrange
.set
)
612 sprintf(buf
, "%u-%u", s
->portrange
.port_min
, s
->portrange
.port_max
);
614 ptr
.option
= "portrange";
621 fw3_write_statefile(void *state
)
624 struct fw3_state
*s
= state
;
627 struct ifaddrs
*ifaddr
;
629 struct uci_package
*p
;
631 if (fw3_no_family(s
->defaults
.flags
[0]) &&
632 fw3_no_family(s
->defaults
.flags
[1]))
634 unlink(FW3_STATEFILE
);
638 sf
= fopen(FW3_STATEFILE
, "w+");
642 warn("Cannot create state %s: %s", FW3_STATEFILE
, strerror(errno
));
646 if (getifaddrs(&ifaddr
))
648 warn("Cannot get interface addresses: %s", strerror(errno
));
652 if ((p
= uci_lookup_package(s
->uci
, "fw3_state")) != NULL
)
653 uci_unload(s
->uci
, p
);
655 uci_import(s
->uci
, sf
, "fw3_state", NULL
, true);
657 if ((p
= uci_lookup_package(s
->uci
, "fw3_state")) != NULL
)
659 write_defaults_uci(s
->uci
, &s
->defaults
, p
);
661 list_for_each_entry(z
, &s
->zones
, list
)
662 write_zone_uci(s
->uci
, z
, p
, ifaddr
);
664 list_for_each_entry(i
, &s
->ipsets
, list
)
665 write_ipset_uci(s
->uci
, i
, p
);
667 uci_export(s
->uci
, sf
, p
, true);
668 uci_unload(s
->uci
, p
);
681 fw3_free_object(void *obj
, const void *opts
)
683 const struct fw3_option
*ol
;
684 struct list_head
*list
, *cur
, *tmp
;
686 for (ol
= opts
; ol
->name
; ol
++)
691 list
= (struct list_head
*)((char *)obj
+ ol
->offset
);
692 list_for_each_safe(cur
, tmp
, list
)
703 fw3_free_list(struct list_head
*head
)
705 struct list_head
*entry
, *tmp
;
710 list_for_each_safe(entry
, tmp
, head
)
720 fw3_hotplug(bool add
, void *zone
, void *device
)
722 struct fw3_zone
*z
= zone
;
723 struct fw3_device
*d
= device
;
731 warn("Unable to fork(): %s\n", strerror(errno
));
747 setenv("ACTION", add
? "add" : "remove", 1);
748 setenv("ZONE", z
->name
, 1);
749 setenv("INTERFACE", d
->network
, 1);
750 setenv("DEVICE", d
->name
, 1);
752 execl(FW3_HOTPLUG
, FW3_HOTPLUG
, "firewall", NULL
);
759 fw3_netmask2bitlen(int family
, void *mask
)
765 if (family
== FW3_FAMILY_V6
)
766 for (bits
= 0, v6
= mask
;
767 bits
< 128 && (v6
->s6_addr
[bits
/ 8] << (bits
% 8)) & 128;
770 for (bits
= 0, v4
= mask
;
771 bits
< 32 && (ntohl(v4
->s_addr
) << bits
) & 0x80000000;
778 fw3_bitlen2netmask(int family
, int bits
, void *mask
)
785 if (family
== FW3_FAMILY_V6
)
787 if (bits
< -128 || bits
> 128)
793 for (i
= 0; i
< sizeof(v6
->s6_addr
); i
++)
795 b
= (rem
> 8) ? 8 : rem
;
796 v6
->s6_addr
[i
] = (uint8_t)(0xFF << (8 - b
));
801 for (i
= 0; i
< sizeof(v6
->s6_addr
); i
++)
802 v6
->s6_addr
[i
] = ~v6
->s6_addr
[i
];
806 if (bits
< -32 || bits
> 32)
810 v4
->s_addr
= bits
? htonl(~((1 << (32 - abs(bits
))) - 1)) : 0;
813 v4
->s_addr
= ~v4
->s_addr
;
820 fw3_flush_conntrack(void *state
)
823 struct fw3_state
*s
= state
;
824 struct fw3_address
*addr
;
825 struct fw3_device
*dev
;
826 struct fw3_zone
*zone
;
827 struct ifaddrs
*ifaddr
, *ifa
;
828 struct sockaddr_in
*sin
;
829 struct sockaddr_in6
*sin6
;
830 char buf
[INET6_ADDRSTRLEN
];
835 if ((ct
= fopen("/proc/net/nf_conntrack", "w")) != NULL
)
837 info(" * Flushing conntrack table ...");
839 fwrite("f\n", 1, 2, ct
);
846 if (getifaddrs(&ifaddr
))
848 warn("Cannot get interface addresses: %s", strerror(errno
));
852 if ((ct
= fopen("/proc/net/nf_conntrack", "w")) != NULL
)
854 list_for_each_entry(zone
, &s
->zones
, list
)
855 list_for_each_entry(addr
, &zone
->old_addrs
, list
)
859 list_for_each_entry(dev
, &zone
->devices
, list
)
861 for (ifa
= ifaddr
; ifa
&& !found
; ifa
= ifa
->ifa_next
)
863 if (!ifa
->ifa_addr
|| strcmp(dev
->name
, ifa
->ifa_name
))
866 sin
= (struct sockaddr_in
*)ifa
->ifa_addr
;
867 sin6
= (struct sockaddr_in6
*)ifa
->ifa_addr
;
869 if (addr
->family
== FW3_FAMILY_V4
&&
870 sin
->sin_family
== AF_INET
)
872 found
= !memcmp(&addr
->address
.v4
, &sin
->sin_addr
,
873 sizeof(sin
->sin_addr
));
875 else if (addr
->family
== FW3_FAMILY_V6
&&
876 sin6
->sin6_family
== AF_INET6
)
878 found
= !memcmp(&addr
->address
.v6
, &sin6
->sin6_addr
,
879 sizeof(sin6
->sin6_addr
));
889 inet_ntop(addr
->family
== FW3_FAMILY_V4
? AF_INET
: AF_INET6
,
890 &addr
->address
.v4
, buf
, sizeof(buf
));
892 info(" * Flushing conntrack: %s", buf
);
893 fprintf(ct
, "%s\n", buf
);
903 bool fw3_attr_parse_name_type(struct blob_attr
*entry
, const char **name
, const char **type
)
905 struct blob_attr
*opt
;
913 blobmsg_for_each_attr(opt
, entry
, orem
)
914 if (!strcmp(blobmsg_name(opt
), "type"))
915 *type
= blobmsg_get_string(opt
);
916 else if (!strcmp(blobmsg_name(opt
), "name"))
917 *name
= blobmsg_get_string(opt
);
919 return *type
!= NULL
? true : false;
923 fw3_protoname(void *proto
)
925 static char buf
[sizeof("4294967295")];
926 struct fw3_protocol
*p
= proto
;
932 pe
= getprotobynumber(p
->protocol
);
936 snprintf(buf
, sizeof(buf
), "%u", p
->protocol
);
944 fw3_check_loopback_dev(const char *name
)
950 s
= socket(AF_LOCAL
, SOCK_DGRAM
, 0);
955 memset(&ifr
, 0, sizeof(ifr
));
956 strncpy(ifr
.ifr_name
, name
, sizeof(ifr
.ifr_name
) - 1);
958 if (ioctl(s
, SIOCGIFFLAGS
, &ifr
) >= 0) {
959 if (ifr
.ifr_flags
& IFF_LOOPBACK
)
969 fw3_check_loopback_addr(struct fw3_address
*addr
)
971 if (addr
->family
== FW3_FAMILY_V4
&&
972 (ntohl(addr
->address
.v4
.s_addr
) >> IN_CLASSA_NSHIFT
) == IN_LOOPBACKNET
)
975 if (addr
->family
== FW3_FAMILY_V6
&& !addr
->range
&&
976 fw3_netmask2bitlen(FW3_FAMILY_V6
, &addr
->mask
.v6
) == 128 &&
977 IN6_IS_ADDR_LOOPBACK(&addr
->address
.v6
))