1 /* Code to take an ip6tables-style command line and do it. */
4 * Author: Paul.Russell@rustcorp.com.au and mneuling@radlogic.com.au
6 * (C) 2000-2002 by the netfilter coreteam <coreteam@netfilter.org>:
7 * Paul 'Rusty' Russell <rusty@rustcorp.com.au>
8 * Marc Boucher <marc+nf@mbsi.ca>
9 * James Morris <jmorris@intercode.com.au>
10 * Harald Welte <laforge@gnumonks.org>
11 * Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or
16 * (at your option) any later version.
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software
25 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
38 #include <ip6tables.h>
39 #include <arpa/inet.h>
43 #include <sys/types.h>
44 #include <sys/socket.h>
53 #ifndef PROC_SYS_MODPROBE
54 #define PROC_SYS_MODPROBE "/proc/sys/kernel/modprobe"
57 #define FMT_NUMERIC 0x0001
58 #define FMT_NOCOUNTS 0x0002
59 #define FMT_KILOMEGAGIGA 0x0004
60 #define FMT_OPTIONS 0x0008
61 #define FMT_NOTABLE 0x0010
62 #define FMT_NOTARGET 0x0020
63 #define FMT_VIA 0x0040
64 #define FMT_NONEWLINE 0x0080
65 #define FMT_LINENUMBERS 0x0100
67 #define FMT_PRINT_RULE (FMT_NOCOUNTS | FMT_OPTIONS | FMT_VIA \
68 | FMT_NUMERIC | FMT_NOTABLE)
69 #define FMT(tab,notab) ((format) & FMT_NOTABLE ? (notab) : (tab))
72 #define CMD_NONE 0x0000U
73 #define CMD_INSERT 0x0001U
74 #define CMD_DELETE 0x0002U
75 #define CMD_DELETE_NUM 0x0004U
76 #define CMD_REPLACE 0x0008U
77 #define CMD_APPEND 0x0010U
78 #define CMD_LIST 0x0020U
79 #define CMD_FLUSH 0x0040U
80 #define CMD_ZERO 0x0080U
81 #define CMD_NEW_CHAIN 0x0100U
82 #define CMD_DELETE_CHAIN 0x0200U
83 #define CMD_SET_POLICY 0x0400U
84 #define CMD_RENAME_CHAIN 0x0800U
85 #define NUMBER_OF_CMD 13
86 static const char cmdflags[] = { 'I', 'D', 'D', 'R', 'A', 'L', 'F', 'Z',
89 #define OPTION_OFFSET 256
91 #define OPT_NONE 0x00000U
92 #define OPT_NUMERIC 0x00001U
93 #define OPT_SOURCE 0x00002U
94 #define OPT_DESTINATION 0x00004U
95 #define OPT_PROTOCOL 0x00008U
96 #define OPT_JUMP 0x00010U
97 #define OPT_VERBOSE 0x00020U
98 #define OPT_EXPANDED 0x00040U
99 #define OPT_VIANAMEIN 0x00080U
100 #define OPT_VIANAMEOUT 0x00100U
101 #define OPT_LINENUMBERS 0x00200U
102 #define OPT_COUNTERS 0x00400U
103 #define NUMBER_OF_OPT 11
104 static const char optflags[NUMBER_OF_OPT]
105 = { 'n', 's', 'd', 'p', 'j', 'v', 'x', 'i', 'o', '0', 'c'};
107 static struct option original_opts[] = {
108 { "append", 1, 0, 'A' },
109 { "delete", 1, 0, 'D' },
110 { "insert", 1, 0, 'I' },
111 { "replace", 1, 0, 'R' },
112 { "list", 2, 0, 'L' },
113 { "flush", 2, 0, 'F' },
114 { "zero", 2, 0, 'Z' },
115 { "new-chain", 1, 0, 'N' },
116 { "delete-chain", 2, 0, 'X' },
117 { "rename-chain", 1, 0, 'E' },
118 { "policy", 1, 0, 'P' },
119 { "source", 1, 0, 's' },
120 { "destination", 1, 0, 'd' },
121 { "src", 1, 0, 's' }, /* synonym */
122 { "dst", 1, 0, 'd' }, /* synonym */
123 { "protocol", 1, 0, 'p' },
124 { "in-interface", 1, 0, 'i' },
125 { "jump", 1, 0, 'j' },
126 { "table", 1, 0, 't' },
127 { "match", 1, 0, 'm' },
128 { "numeric", 0, 0, 'n' },
129 { "out-interface", 1, 0, 'o' },
130 { "verbose", 0, 0, 'v' },
131 { "exact", 0, 0, 'x' },
132 { "version", 0, 0, 'V' },
133 { "help", 2, 0, 'h' },
134 { "line-numbers", 0, 0, '0' },
135 { "modprobe", 1, 0, 'M' },
136 { "set-counters", 1, 0, 'c' },
140 /* we need this for ip6tables-restore. ip6tables-restore.c sets line to the
141 * current line of the input file, in order to give a more precise error
142 * message. ip6tables itself doesn't need this, so it is initialized to the
143 * magic number of -1 */
146 static struct option *opts = original_opts;
147 static unsigned int global_option_offset = 0;
149 /* Table of legal combinations of commands and options. If any of the
150 * given commands make an option legal, that option is legal (applies to
151 * CMD_LIST and CMD_ZERO only).
158 static char commands_v_options[NUMBER_OF_CMD][NUMBER_OF_OPT] =
159 /* Well, it's better than "Re: Linux vs FreeBSD" */
161 /* -n -s -d -p -j -v -x -i -o --line -c */
162 /*INSERT*/ {'x',' ',' ',' ',' ',' ','x',' ',' ','x',' '},
163 /*DELETE*/ {'x',' ',' ',' ',' ',' ','x',' ',' ','x','x'},
164 /*DELETE_NUM*/{'x','x','x','x','x',' ','x','x','x','x','x'},
165 /*REPLACE*/ {'x',' ',' ',' ',' ',' ','x',' ',' ','x',' '},
166 /*APPEND*/ {'x',' ',' ',' ',' ',' ','x',' ',' ','x',' '},
167 /*LIST*/ {' ','x','x','x','x',' ',' ','x','x',' ','x'},
168 /*FLUSH*/ {'x','x','x','x','x',' ','x','x','x','x','x'},
169 /*ZERO*/ {'x','x','x','x','x',' ','x','x','x','x','x'},
170 /*NEW_CHAIN*/ {'x','x','x','x','x',' ','x','x','x','x','x'},
171 /*DEL_CHAIN*/ {'x','x','x','x','x',' ','x','x','x','x','x'},
172 /*SET_POLICY*/{'x','x','x','x','x',' ','x','x','x','x','x'},
173 /*RENAME*/ {'x','x','x','x','x',' ','x','x','x','x','x'}
176 static int inverse_for_options[NUMBER_OF_OPT] =
179 /* -s */ IP6T_INV_SRCIP,
180 /* -d */ IP6T_INV_DSTIP,
181 /* -p */ IP6T_INV_PROTO,
185 /* -i */ IP6T_INV_VIA_IN,
186 /* -o */ IP6T_INV_VIA_OUT,
191 const char *program_version;
192 const char *program_name;
195 /* the path to command to load kernel module */
196 const char *modprobe = NULL;
198 /* Keeping track of external matches and targets: linked lists. */
199 struct ip6tables_match *ip6tables_matches = NULL;
200 struct ip6tables_target *ip6tables_targets = NULL;
202 /* Extra debugging from libiptc */
203 extern void dump_entries6(const ip6tc_handle_t handle);
205 /* A few hardcoded protocols for 'all' and in case the user has no
212 /* Primitive headers... */
213 /* defined in netinet/in.h */
216 #define IPPROTO_ESP 50
219 #define IPPROTO_AH 51
223 #define IPPROTO_MH 135
226 static const struct pprot chain_protos[] = {
227 { "tcp", IPPROTO_TCP },
228 { "udp", IPPROTO_UDP },
229 { "udplite", IPPROTO_UDPLITE },
230 { "icmpv6", IPPROTO_ICMPV6 },
231 { "ipv6-icmp", IPPROTO_ICMPV6 },
232 { "esp", IPPROTO_ESP },
233 { "ah", IPPROTO_AH },
234 { "ipv6-mh", IPPROTO_MH },
235 { "mh", IPPROTO_MH },
240 proto_to_name(u_int8_t proto, int nolookup)
244 if (proto && !nolookup) {
245 struct protoent *pent = getprotobynumber(proto);
250 for (i = 0; i < sizeof(chain_protos)/sizeof(struct pprot); i++)
251 if (chain_protos[i].num == proto)
252 return chain_protos[i].name;
258 service_to_port(const char *name, const char *proto)
260 struct servent *service;
262 if ((service = getservbyname(name, proto)) != NULL)
263 return ntohs((unsigned short) service->s_port);
269 parse_port(const char *port, const char *proto)
271 unsigned int portnum;
273 if ((string_to_number(port, 0, 65535, &portnum)) != -1 ||
274 (portnum = service_to_port(port, proto)) != -1)
275 return (u_int16_t)portnum;
277 exit_error(PARAMETER_PROBLEM,
278 "invalid port/service `%s' specified", port);
282 in6addrcpy(struct in6_addr *dst, struct in6_addr *src)
284 memcpy(dst, src, sizeof(struct in6_addr));
285 /* dst->s6_addr = src->s6_addr; */
288 static void free_opts(int reset_offset)
290 if (opts != original_opts) {
292 opts = original_opts;
294 global_option_offset = 0;
299 exit_error(enum exittype status, char *msg, ...)
304 fprintf(stderr, "%s v%s: ", program_name, program_version);
305 vfprintf(stderr, msg, args);
307 fprintf(stderr, "\n");
308 if (status == PARAMETER_PROBLEM)
309 exit_tryhelp(status);
310 if (status == VERSION_PROBLEM)
312 "Perhaps ip6tables or your kernel needs to be upgraded.\n");
313 /* On error paths, make sure that we don't leak memory */
319 exit_tryhelp(int status)
322 fprintf(stderr, "Error occurred at line: %d\n", line);
323 fprintf(stderr, "Try `%s -h' or '%s --help' for more information.\n",
324 program_name, program_name );
330 exit_printhelp(struct ip6tables_rule_match *matches)
332 struct ip6tables_rule_match *matchp = NULL;
333 struct ip6tables_target *t = NULL;
336 "Usage: %s -[AD] chain rule-specification [options]\n"
337 " %s -[RI] chain rulenum rule-specification [options]\n"
338 " %s -D chain rulenum [options]\n"
339 " %s -[LFZ] [chain] [options]\n"
341 " %s -E old-chain-name new-chain-name\n"
342 " %s -P chain target [options]\n"
343 " %s -h (print this help information)\n\n",
344 program_name, program_version, program_name, program_name,
345 program_name, program_name, program_name, program_name,
346 program_name, program_name);
350 "Either long or short options are allowed.\n"
351 " --append -A chain Append to chain\n"
352 " --delete -D chain Delete matching rule from chain\n"
353 " --delete -D chain rulenum\n"
354 " Delete rule rulenum (1 = first) from chain\n"
355 " --insert -I chain [rulenum]\n"
356 " Insert in chain as rulenum (default 1=first)\n"
357 " --replace -R chain rulenum\n"
358 " Replace rule rulenum (1 = first) in chain\n"
359 " --list -L [chain] List the rules in a chain or all chains\n"
360 " --flush -F [chain] Delete all rules in chain or all chains\n"
361 " --zero -Z [chain] Zero counters in chain or all chains\n"
362 " --new -N chain Create a new user-defined chain\n"
364 " -X [chain] Delete a user-defined chain\n"
365 " --policy -P chain target\n"
366 " Change policy on chain to target\n"
368 " -E old-chain new-chain\n"
369 " Change chain name, (moving any references)\n"
372 " --proto -p [!] proto protocol: by number or name, eg. `tcp'\n"
373 " --source -s [!] address[/mask]\n"
374 " source specification\n"
375 " --destination -d [!] address[/mask]\n"
376 " destination specification\n"
377 " --in-interface -i [!] input name[+]\n"
378 " network interface name ([+] for wildcard)\n"
379 " --jump -j target\n"
380 " target for rule (may load target extension)\n"
381 " --match -m match\n"
382 " extended match (may load extension)\n"
383 " --numeric -n numeric output of addresses and ports\n"
384 " --out-interface -o [!] output name[+]\n"
385 " network interface name ([+] for wildcard)\n"
386 " --table -t table table to manipulate (default: `filter')\n"
387 " --verbose -v verbose mode\n"
388 " --line-numbers print line numbers when listing\n"
389 " --exact -x expand numbers (display exact values)\n"
390 /*"[!] --fragment -f match second or further fragments only\n"*/
391 " --modprobe=<command> try to insert modules using this command\n"
392 " --set-counters PKTS BYTES set the counter during insert/append\n"
393 "[!] --version -V print package version.\n");
395 /* Print out any special helps. A user might like to be able to add a --help
396 to the commandline, and see expected results. So we call help for all
397 specified matches & targets */
398 for (t = ip6tables_targets; t; t = t->next) {
404 for (matchp = matches; matchp; matchp = matchp->next) {
406 matchp->match->help();
412 generic_opt_check(int command, int options)
416 /* Check that commands are valid with options. Complicated by the
417 * fact that if an option is legal with *any* command given, it is
418 * legal overall (ie. -z and -l).
420 for (i = 0; i < NUMBER_OF_OPT; i++) {
421 legal = 0; /* -1 => illegal, 1 => legal, 0 => undecided. */
423 for (j = 0; j < NUMBER_OF_CMD; j++) {
424 if (!(command & (1<<j)))
427 if (!(options & (1<<i))) {
428 if (commands_v_options[j][i] == '+')
429 exit_error(PARAMETER_PROBLEM,
430 "You need to supply the `-%c' "
431 "option for this command\n",
434 if (commands_v_options[j][i] != 'x')
441 exit_error(PARAMETER_PROBLEM,
442 "Illegal option `-%c' with this command\n",
451 for (ptr = optflags; option > 1; option >>= 1, ptr++);
460 for (ptr = cmdflags; option > 1; option >>= 1, ptr++);
466 add_command(unsigned int *cmd, const int newcmd, const int othercmds,
470 exit_error(PARAMETER_PROBLEM, "unexpected ! flag");
471 if (*cmd & (~othercmds))
472 exit_error(PARAMETER_PROBLEM, "Can't use -%c with -%c\n",
473 cmd2char(newcmd), cmd2char(*cmd & (~othercmds)));
478 check_inverse(const char option[], int *invert, int *optind, int argc)
480 if (option && strcmp(option, "!") == 0) {
482 exit_error(PARAMETER_PROBLEM,
483 "Multiple `!' flags not allowed");
487 if (argc && *optind > argc)
488 exit_error(PARAMETER_PROBLEM,
489 "no argument following `!'");
498 fw_calloc(size_t count, size_t size)
502 if ((p = calloc(count, size)) == NULL) {
503 perror("ip6tables: calloc failed");
510 fw_malloc(size_t size)
514 if ((p = malloc(size)) == NULL) {
515 perror("ip6tables: malloc failed");
522 addr_to_numeric(const struct in6_addr *addrp)
524 /* 0000:0000:0000:0000:0000:000.000.000.000
525 * 0000:0000:0000:0000:0000:0000:0000:0000 */
526 static char buf[50+1];
527 return (char *)inet_ntop(AF_INET6, addrp, buf, sizeof(buf));
530 static struct in6_addr *
531 numeric_to_addr(const char *num)
533 static struct in6_addr ap;
535 if ((err=inet_pton(AF_INET6, num, &ap)) == 1)
538 fprintf(stderr, "\nnumeric2addr: %d\n", err);
540 return (struct in6_addr *)NULL;
544 static struct in6_addr *
545 host_to_addr(const char *name, unsigned int *naddr)
547 struct addrinfo hints;
548 struct addrinfo *res;
549 static struct in6_addr *addr;
552 memset(&hints, 0, sizeof(hints));
553 hints.ai_flags=AI_CANONNAME;
554 hints.ai_family=AF_INET6;
555 hints.ai_socktype=SOCK_RAW;
556 hints.ai_protocol=41;
560 if ( (err=getaddrinfo(name, NULL, &hints, &res)) != 0 ){
562 fprintf(stderr,"Name2IP: %s\n",gai_strerror(err));
564 return (struct in6_addr *) NULL;
566 if (res->ai_family != AF_INET6 ||
567 res->ai_addrlen != sizeof(struct sockaddr_in6))
568 return (struct in6_addr *) NULL;
571 fprintf(stderr, "resolved: len=%d %s ", res->ai_addrlen,
572 addr_to_numeric(&(((struct sockaddr_in6 *)res->ai_addr)->sin6_addr)));
574 /* Get the first element of the address-chain */
575 addr = fw_calloc(1, sizeof(struct in6_addr));
576 in6addrcpy(addr, (struct in6_addr *)
577 &((struct sockaddr_in6 *)res->ai_addr)->sin6_addr);
583 return (struct in6_addr *) NULL;
587 addr_to_host(const struct in6_addr *addr)
589 struct sockaddr_in6 saddr;
591 static char hostname[NI_MAXHOST];
593 memset(&saddr, 0, sizeof(struct sockaddr_in6));
594 in6addrcpy(&(saddr.sin6_addr),(struct in6_addr *)addr);
595 saddr.sin6_family = AF_INET6;
597 if ( (err=getnameinfo((struct sockaddr *)&saddr,
598 sizeof(struct sockaddr_in6),
599 hostname, sizeof(hostname)-1,
602 fprintf(stderr,"IP2Name: %s\n",gai_strerror(err));
604 return (char *) NULL;
607 fprintf (stderr, "\naddr2host: %s\n", hostname);
613 return (char *) NULL;
617 mask_to_numeric(const struct in6_addr *addrp)
619 static char buf[50+2];
620 int l = ipv6_prefix_length(addrp);
623 strcat(buf, addr_to_numeric(addrp));
626 sprintf(buf, "/%d", l);
630 static struct in6_addr *
631 network_to_addr(const char *name)
634 /* TODO: not implemented yet, but the exception breaks the
635 * name resolvation */
636 return (struct in6_addr *)NULL;
640 addr_to_anyname(const struct in6_addr *addr)
644 if ((name = addr_to_host(addr)) != NULL)
647 return addr_to_numeric(addr);
651 * All functions starting with "parse" should succeed, otherwise
653 * Most routines return pointers to static data that may change
654 * between calls to the same or other routines with a few exceptions:
655 * "host_to_addr", "parse_hostnetwork", and "parse_hostnetworkmask"
656 * return global static data.
659 static struct in6_addr *
660 parse_hostnetwork(const char *name, unsigned int *naddrs)
662 struct in6_addr *addrp, *addrptmp;
664 if ((addrptmp = numeric_to_addr(name)) != NULL ||
665 (addrptmp = network_to_addr(name)) != NULL) {
666 addrp = fw_malloc(sizeof(struct in6_addr));
667 in6addrcpy(addrp, addrptmp);
671 if ((addrp = host_to_addr(name, naddrs)) != NULL)
674 exit_error(PARAMETER_PROBLEM, "host/network `%s' not found", name);
677 static struct in6_addr *
678 parse_mask(char *mask)
680 static struct in6_addr maskaddr;
681 struct in6_addr *addrp;
685 /* no mask at all defaults to 128 bits */
686 memset(&maskaddr, 0xff, sizeof maskaddr);
689 if ((addrp = numeric_to_addr(mask)) != NULL)
691 if (string_to_number(mask, 0, 128, &bits) == -1)
692 exit_error(PARAMETER_PROBLEM,
693 "invalid mask `%s' specified", mask);
695 char *p = (char *)&maskaddr;
696 memset(p, 0xff, bits / 8);
697 memset(p + (bits / 8) + 1, 0, (128 - bits) / 8);
698 p[bits / 8] = 0xff << (8 - (bits & 7));
702 memset(&maskaddr, 0, sizeof maskaddr);
707 parse_hostnetworkmask(const char *name, struct in6_addr **addrpp,
708 struct in6_addr *maskp, unsigned int *naddrs)
710 struct in6_addr *addrp;
715 strncpy(buf, name, sizeof(buf) - 1);
716 buf[sizeof(buf) - 1] = '\0';
717 if ((p = strrchr(buf, '/')) != NULL) {
719 addrp = parse_mask(p + 1);
721 addrp = parse_mask(NULL);
722 in6addrcpy(maskp, addrp);
724 /* if a null mask is given, the name is ignored, like in "any/0" */
725 if (!memcmp(maskp, &in6addr_any, sizeof(in6addr_any)))
728 addrp = *addrpp = parse_hostnetwork(buf, naddrs);
730 for (i = 0, j = 0; i < n; i++) {
732 for (k = 0; k < 4; k++)
733 addrp[j].s6_addr32[k] &= maskp->s6_addr32[k];
735 for (k = 0; k < j - 1; k++) {
736 if (IN6_ARE_ADDR_EQUAL(&addrp[k], &addrp[j - 1])) {
745 struct ip6tables_match *
746 find_match(const char *match_name, enum ip6t_tryload tryload, struct ip6tables_rule_match **matches)
748 struct ip6tables_match *ptr;
749 const char *icmp6 = "icmp6";
752 /* This is ugly as hell. Nonetheless, there is no way of changing
753 * this without hurting backwards compatibility */
754 if ( (strcmp(match_name,"icmpv6") == 0) ||
755 (strcmp(match_name,"ipv6-icmp") == 0) ||
756 (strcmp(match_name,"icmp6") == 0) )
761 for (ptr = ip6tables_matches; ptr; ptr = ptr->next) {
762 if (strcmp(name, ptr->name) == 0) {
763 struct ip6tables_match *clone;
765 /* First match of this type: */
769 /* Second and subsequent clones */
770 clone = fw_malloc(sizeof(struct ip6tables_match));
771 memcpy(clone, ptr, sizeof(struct ip6tables_match));
773 /* This is a clone: */
781 #ifndef NO_SHARED_LIBS
782 if (!ptr && tryload != DONT_LOAD && tryload != DURING_LOAD) {
783 char path[strlen(lib_dir) + sizeof("/libip6t_.so")
785 sprintf(path, "%s/libip6t_%s.so", lib_dir, name);
786 if (dlopen(path, RTLD_NOW)) {
787 /* Found library. If it didn't register itself,
788 maybe they specified target as match. */
789 ptr = find_match(name, DONT_LOAD, NULL);
792 exit_error(PARAMETER_PROBLEM,
793 "Couldn't load match `%s'\n",
795 } else if (tryload == LOAD_MUST_SUCCEED)
796 exit_error(PARAMETER_PROBLEM,
797 "Couldn't load match `%s':%s\n",
801 if (ptr && !ptr->loaded) {
802 if (tryload != DONT_LOAD)
807 if(!ptr && (tryload == LOAD_MUST_SUCCEED)) {
808 exit_error(PARAMETER_PROBLEM,
809 "Couldn't find match `%s'\n", name);
813 if (ptr && matches) {
814 struct ip6tables_rule_match **i;
815 struct ip6tables_rule_match *newentry;
817 newentry = fw_malloc(sizeof(struct ip6tables_rule_match));
819 for (i = matches; *i; i = &(*i)->next) {
820 if (strcmp(name, (*i)->match->name) == 0)
823 newentry->match = ptr;
824 newentry->completed = 0;
825 newentry->next = NULL;
832 /* Christophe Burki wants `-p 6' to imply `-m tcp'. */
833 static struct ip6tables_match *
834 find_proto(const char *pname, enum ip6t_tryload tryload, int nolookup, struct ip6tables_rule_match **matches)
838 if (string_to_number(pname, 0, 255, &proto) != -1) {
839 char *protoname = proto_to_name(proto, nolookup);
842 return find_match(protoname, tryload, matches);
844 return find_match(pname, tryload, matches);
850 parse_protocol(const char *s)
854 if (string_to_number(s, 0, 255, &proto) == -1) {
855 struct protoent *pent;
857 /* first deal with the special case of 'all' to prevent
858 * people from being able to redefine 'all' in nsswitch
859 * and/or provoke expensive [not working] ldap/nis/...
861 if (!strcmp(s, "all"))
864 if ((pent = getprotobyname(s)))
865 proto = pent->p_proto;
869 i < sizeof(chain_protos)/sizeof(struct pprot);
871 if (strcmp(s, chain_protos[i].name) == 0) {
872 proto = chain_protos[i].num;
876 if (i == sizeof(chain_protos)/sizeof(struct pprot))
877 exit_error(PARAMETER_PROBLEM,
878 "unknown protocol `%s' specified",
883 return (u_int16_t)proto;
886 /* These are invalid numbers as upper layer protocol */
887 static int is_exthdr(u_int16_t proto)
889 return (proto == IPPROTO_ROUTING ||
890 proto == IPPROTO_FRAGMENT ||
891 proto == IPPROTO_AH ||
892 proto == IPPROTO_DSTOPTS);
895 void parse_interface(const char *arg, char *vianame, unsigned char *mask)
897 int vialen = strlen(arg);
900 memset(mask, 0, IFNAMSIZ);
901 memset(vianame, 0, IFNAMSIZ);
903 if (vialen + 1 > IFNAMSIZ)
904 exit_error(PARAMETER_PROBLEM,
905 "interface name `%s' must be shorter than IFNAMSIZ"
906 " (%i)", arg, IFNAMSIZ-1);
908 strcpy(vianame, arg);
909 if ((vialen == 0) || (vialen == 1 && vianame[0] == '+'))
910 memset(mask, 0, IFNAMSIZ);
911 else if (vianame[vialen - 1] == '+') {
912 memset(mask, 0xFF, vialen - 1);
913 memset(mask + vialen - 1, 0, IFNAMSIZ - vialen + 1);
914 /* Don't remove `+' here! -HW */
916 /* Include nul-terminator in match */
917 memset(mask, 0xFF, vialen + 1);
918 memset(mask + vialen + 1, 0, IFNAMSIZ - vialen - 1);
919 for (i = 0; vianame[i]; i++) {
920 if (vianame[i] == ':' ||
923 printf("Warning: weird character in interface"
924 " `%s' (No aliases, :, ! or *).\n",
934 parse_rulenumber(const char *rule)
936 unsigned int rulenum;
938 if (string_to_number(rule, 1, INT_MAX, &rulenum) == -1)
939 exit_error(PARAMETER_PROBLEM,
940 "Invalid rule number `%s'", rule);
946 parse_target(const char *targetname)
950 if (strlen(targetname) < 1)
951 exit_error(PARAMETER_PROBLEM,
952 "Invalid target name (too short)");
954 if (strlen(targetname)+1 > sizeof(ip6t_chainlabel))
955 exit_error(PARAMETER_PROBLEM,
956 "Invalid target name `%s' (%u chars max)",
957 targetname, (unsigned int)sizeof(ip6t_chainlabel)-1);
959 for (ptr = targetname; *ptr; ptr++)
961 exit_error(PARAMETER_PROBLEM,
962 "Invalid target name `%s'", targetname);
967 string_to_number_ll(const char *s, unsigned long long min, unsigned long long max,
968 unsigned long long *ret)
970 unsigned long long number;
973 /* Handle hex, octal, etc. */
975 number = strtoull(s, &end, 0);
976 if (*end == '\0' && end != s) {
977 /* we parsed a number, let's see if we want this */
978 if (errno != ERANGE && min <= number && (!max || number <= max)) {
987 string_to_number_l(const char *s, unsigned long min, unsigned long max,
991 unsigned long long number;
993 result = string_to_number_ll(s, min, max, &number);
994 *ret = (unsigned long)number;
999 int string_to_number(const char *s, unsigned int min, unsigned int max,
1003 unsigned long number;
1005 result = string_to_number_l(s, min, max, &number);
1006 *ret = (unsigned int)number;
1012 set_option(unsigned int *options, unsigned int option, u_int8_t *invflg,
1015 if (*options & option)
1016 exit_error(PARAMETER_PROBLEM, "multiple -%c flags not allowed",
1022 for (i = 0; 1 << i != option; i++);
1024 if (!inverse_for_options[i])
1025 exit_error(PARAMETER_PROBLEM,
1026 "cannot have ! before -%c",
1028 *invflg |= inverse_for_options[i];
1032 struct ip6tables_target *
1033 find_target(const char *name, enum ip6t_tryload tryload)
1035 struct ip6tables_target *ptr;
1037 /* Standard target? */
1038 if (strcmp(name, "") == 0
1039 || strcmp(name, IP6TC_LABEL_ACCEPT) == 0
1040 || strcmp(name, IP6TC_LABEL_DROP) == 0
1041 || strcmp(name, IP6TC_LABEL_QUEUE) == 0
1042 || strcmp(name, IP6TC_LABEL_RETURN) == 0)
1045 for (ptr = ip6tables_targets; ptr; ptr = ptr->next) {
1046 if (strcmp(name, ptr->name) == 0)
1050 #ifndef NO_SHARED_LIBS
1051 if (!ptr && tryload != DONT_LOAD && tryload != DURING_LOAD) {
1052 char path[strlen(lib_dir) + sizeof("/libip6t_.so")
1054 sprintf(path, "%s/libip6t_%s.so", lib_dir, name);
1055 if (dlopen(path, RTLD_NOW)) {
1056 /* Found library. If it didn't register itself,
1057 maybe they specified match as a target. */
1058 ptr = find_target(name, DONT_LOAD);
1060 exit_error(PARAMETER_PROBLEM,
1061 "Couldn't load target `%s'\n",
1063 } else if (tryload == LOAD_MUST_SUCCEED)
1064 exit_error(PARAMETER_PROBLEM,
1065 "Couldn't load target `%s':%s\n",
1069 if (ptr && !ptr->loaded) {
1070 if (tryload != DONT_LOAD)
1075 if(!ptr && (tryload == LOAD_MUST_SUCCEED)) {
1076 exit_error(PARAMETER_PROBLEM,
1077 "Couldn't find target `%s'\n", name);
1087 static struct option *
1088 merge_options(struct option *oldopts, const struct option *newopts,
1089 unsigned int *option_offset)
1091 unsigned int num_old, num_new, i;
1092 struct option *merge;
1094 for (num_old = 0; oldopts[num_old].name; num_old++);
1095 for (num_new = 0; newopts[num_new].name; num_new++);
1097 global_option_offset += OPTION_OFFSET;
1098 *option_offset = global_option_offset;
1100 merge = malloc(sizeof(struct option) * (num_new + num_old + 1));
1101 memcpy(merge, oldopts, num_old * sizeof(struct option));
1102 free_opts(0); /* Release previous options merged if any */
1103 for (i = 0; i < num_new; i++) {
1104 merge[num_old + i] = newopts[i];
1105 merge[num_old + i].val += *option_offset;
1107 memset(merge + num_old + num_new, 0, sizeof(struct option));
1112 static int compatible_revision(const char *name, u_int8_t revision, int opt)
1114 struct ip6t_get_revision rev;
1115 socklen_t s = sizeof(rev);
1116 int max_rev, sockfd;
1118 sockfd = socket(AF_INET6, SOCK_RAW, IPPROTO_RAW);
1120 fprintf(stderr, "Could not open socket to kernel: %s\n",
1125 strcpy(rev.name, name);
1126 rev.revision = revision;
1128 load_ip6tables_ko(modprobe, 1);
1130 max_rev = getsockopt(sockfd, IPPROTO_IPV6, opt, &rev, &s);
1132 /* Definitely don't support this? */
1133 if (errno == EPROTONOSUPPORT) {
1136 } else if (errno == ENOPROTOOPT) {
1138 /* Assume only revision 0 support (old kernel) */
1139 return (revision == 0);
1141 fprintf(stderr, "getsockopt failed strangely: %s\n",
1150 static int compatible_match_revision(const char *name, u_int8_t revision)
1152 return compatible_revision(name, revision, IP6T_SO_GET_REVISION_MATCH);
1156 register_match6(struct ip6tables_match *me)
1158 struct ip6tables_match **i, *old;
1160 if (strcmp(me->version, program_version) != 0) {
1161 fprintf(stderr, "%s: match `%s' v%s (I'm v%s).\n",
1162 program_name, me->name, me->version, program_version);
1166 /* Revision field stole a char from name. */
1167 if (strlen(me->name) >= IP6T_FUNCTION_MAXNAMELEN-1) {
1168 fprintf(stderr, "%s: target `%s' has invalid name\n",
1169 program_name, me->name);
1173 old = find_match(me->name, DURING_LOAD, NULL);
1175 if (old->revision == me->revision) {
1177 "%s: match `%s' already registered.\n",
1178 program_name, me->name);
1182 /* Now we have two (or more) options, check compatibility. */
1183 if (compatible_match_revision(old->name, old->revision)
1184 && old->revision > me->revision)
1187 /* Replace if compatible. */
1188 if (!compatible_match_revision(me->name, me->revision))
1191 /* Delete old one. */
1192 for (i = &ip6tables_matches; *i!=old; i = &(*i)->next);
1196 if (me->size != IP6T_ALIGN(me->size)) {
1197 fprintf(stderr, "%s: match `%s' has invalid size %u.\n",
1198 program_name, me->name, (unsigned int)me->size);
1202 /* Append to list. */
1203 for (i = &ip6tables_matches; *i; i = &(*i)->next);
1212 register_target6(struct ip6tables_target *me)
1214 if (strcmp(me->version, program_version) != 0) {
1215 fprintf(stderr, "%s: target `%s' v%s (I'm v%s).\n",
1216 program_name, me->name, me->version, program_version);
1220 if (find_target(me->name, DURING_LOAD)) {
1221 fprintf(stderr, "%s: target `%s' already registered.\n",
1222 program_name, me->name);
1226 if (me->size != IP6T_ALIGN(me->size)) {
1227 fprintf(stderr, "%s: target `%s' has invalid size %u.\n",
1228 program_name, me->name, (unsigned int)me->size);
1232 /* Prepend to list. */
1233 me->next = ip6tables_targets;
1234 ip6tables_targets = me;
1240 print_num(u_int64_t number, unsigned int format)
1242 if (format & FMT_KILOMEGAGIGA) {
1243 if (number > 99999) {
1244 number = (number + 500) / 1000;
1245 if (number > 9999) {
1246 number = (number + 500) / 1000;
1247 if (number > 9999) {
1248 number = (number + 500) / 1000;
1249 if (number > 9999) {
1250 number = (number + 500) / 1000;
1251 printf(FMT("%4lluT ","%lluT "), (unsigned long long)number);
1253 else printf(FMT("%4lluG ","%lluG "), (unsigned long long)number);
1255 else printf(FMT("%4lluM ","%lluM "), (unsigned long long)number);
1257 printf(FMT("%4lluK ","%lluK "), (unsigned long long)number);
1259 printf(FMT("%5llu ","%llu "), (unsigned long long)number);
1261 printf(FMT("%8llu ","%llu "), (unsigned long long)number);
1266 print_header(unsigned int format, const char *chain, ip6tc_handle_t *handle)
1268 struct ip6t_counters counters;
1269 const char *pol = ip6tc_get_policy(chain, &counters, handle);
1270 printf("Chain %s", chain);
1272 printf(" (policy %s", pol);
1273 if (!(format & FMT_NOCOUNTS)) {
1275 print_num(counters.pcnt, (format|FMT_NOTABLE));
1276 fputs("packets, ", stdout);
1277 print_num(counters.bcnt, (format|FMT_NOTABLE));
1278 fputs("bytes", stdout);
1283 if (!ip6tc_get_references(&refs, chain, handle))
1284 printf(" (ERROR obtaining refs)\n");
1286 printf(" (%u references)\n", refs);
1289 if (format & FMT_LINENUMBERS)
1290 printf(FMT("%-4s ", "%s "), "num");
1291 if (!(format & FMT_NOCOUNTS)) {
1292 if (format & FMT_KILOMEGAGIGA) {
1293 printf(FMT("%5s ","%s "), "pkts");
1294 printf(FMT("%5s ","%s "), "bytes");
1296 printf(FMT("%8s ","%s "), "pkts");
1297 printf(FMT("%10s ","%s "), "bytes");
1300 if (!(format & FMT_NOTARGET))
1301 printf(FMT("%-9s ","%s "), "target");
1302 fputs(" prot ", stdout);
1303 if (format & FMT_OPTIONS)
1304 fputs("opt", stdout);
1305 if (format & FMT_VIA) {
1306 printf(FMT(" %-6s ","%s "), "in");
1307 printf(FMT("%-6s ","%s "), "out");
1309 printf(FMT(" %-19s ","%s "), "source");
1310 printf(FMT(" %-19s "," %s "), "destination");
1316 print_match(const struct ip6t_entry_match *m,
1317 const struct ip6t_ip6 *ip,
1320 struct ip6tables_match *match = find_match(m->u.user.name, TRY_LOAD, NULL);
1324 match->print(ip, m, numeric);
1326 printf("%s ", match->name);
1328 if (m->u.user.name[0])
1329 printf("UNKNOWN match `%s' ", m->u.user.name);
1331 /* Don't stop iterating. */
1335 /* e is called `fw' here for hysterical raisins */
1337 print_firewall(const struct ip6t_entry *fw,
1338 const char *targname,
1340 unsigned int format,
1341 const ip6tc_handle_t handle)
1343 struct ip6tables_target *target = NULL;
1344 const struct ip6t_entry_target *t;
1348 if (!ip6tc_is_chain(targname, handle))
1349 target = find_target(targname, TRY_LOAD);
1351 target = find_target(IP6T_STANDARD_TARGET, LOAD_MUST_SUCCEED);
1353 t = ip6t_get_target((struct ip6t_entry *)fw);
1354 flags = fw->ipv6.flags;
1356 if (format & FMT_LINENUMBERS)
1357 printf(FMT("%-4u ", "%u "), num+1);
1359 if (!(format & FMT_NOCOUNTS)) {
1360 print_num(fw->counters.pcnt, format);
1361 print_num(fw->counters.bcnt, format);
1364 if (!(format & FMT_NOTARGET))
1365 printf(FMT("%-9s ", "%s "), targname);
1367 fputc(fw->ipv6.invflags & IP6T_INV_PROTO ? '!' : ' ', stdout);
1369 char *pname = proto_to_name(fw->ipv6.proto, format&FMT_NUMERIC);
1371 printf(FMT("%-5s", "%s "), pname);
1373 printf(FMT("%-5hu", "%hu "), fw->ipv6.proto);
1376 if (format & FMT_OPTIONS) {
1377 if (format & FMT_NOTABLE)
1378 fputs("opt ", stdout);
1379 fputc(' ', stdout); /* Invert flag of FRAG */
1380 fputc(' ', stdout); /* -f */
1384 if (format & FMT_VIA) {
1385 char iface[IFNAMSIZ+2];
1387 if (fw->ipv6.invflags & IP6T_INV_VIA_IN) {
1391 else iface[0] = '\0';
1393 if (fw->ipv6.iniface[0] != '\0') {
1394 strcat(iface, fw->ipv6.iniface);
1396 else if (format & FMT_NUMERIC) strcat(iface, "*");
1397 else strcat(iface, "any");
1398 printf(FMT(" %-6s ","in %s "), iface);
1400 if (fw->ipv6.invflags & IP6T_INV_VIA_OUT) {
1404 else iface[0] = '\0';
1406 if (fw->ipv6.outiface[0] != '\0') {
1407 strcat(iface, fw->ipv6.outiface);
1409 else if (format & FMT_NUMERIC) strcat(iface, "*");
1410 else strcat(iface, "any");
1411 printf(FMT("%-6s ","out %s "), iface);
1414 fputc(fw->ipv6.invflags & IP6T_INV_SRCIP ? '!' : ' ', stdout);
1415 if (!memcmp(&fw->ipv6.smsk, &in6addr_any, sizeof in6addr_any)
1416 && !(format & FMT_NUMERIC))
1417 printf(FMT("%-19s ","%s "), "anywhere");
1419 if (format & FMT_NUMERIC)
1420 sprintf(buf, "%s", addr_to_numeric(&(fw->ipv6.src)));
1422 sprintf(buf, "%s", addr_to_anyname(&(fw->ipv6.src)));
1423 strcat(buf, mask_to_numeric(&(fw->ipv6.smsk)));
1424 printf(FMT("%-19s ","%s "), buf);
1427 fputc(fw->ipv6.invflags & IP6T_INV_DSTIP ? '!' : ' ', stdout);
1428 if (!memcmp(&fw->ipv6.dmsk, &in6addr_any, sizeof in6addr_any)
1429 && !(format & FMT_NUMERIC))
1430 printf(FMT("%-19s","-> %s"), "anywhere");
1432 if (format & FMT_NUMERIC)
1433 sprintf(buf, "%s", addr_to_numeric(&(fw->ipv6.dst)));
1435 sprintf(buf, "%s", addr_to_anyname(&(fw->ipv6.dst)));
1436 strcat(buf, mask_to_numeric(&(fw->ipv6.dmsk)));
1437 printf(FMT("%-19s","-> %s"), buf);
1440 if (format & FMT_NOTABLE)
1443 IP6T_MATCH_ITERATE(fw, print_match, &fw->ipv6, format & FMT_NUMERIC);
1447 /* Print the target information. */
1448 target->print(&fw->ipv6, t, format & FMT_NUMERIC);
1449 } else if (t->u.target_size != sizeof(*t))
1450 printf("[%u bytes of unknown target data] ",
1451 (unsigned int)(t->u.target_size - sizeof(*t)));
1453 if (!(format & FMT_NONEWLINE))
1454 fputc('\n', stdout);
1458 print_firewall_line(const struct ip6t_entry *fw,
1459 const ip6tc_handle_t h)
1461 struct ip6t_entry_target *t;
1463 t = ip6t_get_target((struct ip6t_entry *)fw);
1464 print_firewall(fw, t->u.user.name, 0, FMT_PRINT_RULE, h);
1468 append_entry(const ip6t_chainlabel chain,
1469 struct ip6t_entry *fw,
1470 unsigned int nsaddrs,
1471 const struct in6_addr saddrs[],
1472 unsigned int ndaddrs,
1473 const struct in6_addr daddrs[],
1475 ip6tc_handle_t *handle)
1480 for (i = 0; i < nsaddrs; i++) {
1481 fw->ipv6.src = saddrs[i];
1482 for (j = 0; j < ndaddrs; j++) {
1483 fw->ipv6.dst = daddrs[j];
1485 print_firewall_line(fw, *handle);
1486 ret &= ip6tc_append_entry(chain, fw, handle);
1494 replace_entry(const ip6t_chainlabel chain,
1495 struct ip6t_entry *fw,
1496 unsigned int rulenum,
1497 const struct in6_addr *saddr,
1498 const struct in6_addr *daddr,
1500 ip6tc_handle_t *handle)
1502 fw->ipv6.src = *saddr;
1503 fw->ipv6.dst = *daddr;
1506 print_firewall_line(fw, *handle);
1507 return ip6tc_replace_entry(chain, fw, rulenum, handle);
1511 insert_entry(const ip6t_chainlabel chain,
1512 struct ip6t_entry *fw,
1513 unsigned int rulenum,
1514 unsigned int nsaddrs,
1515 const struct in6_addr saddrs[],
1516 unsigned int ndaddrs,
1517 const struct in6_addr daddrs[],
1519 ip6tc_handle_t *handle)
1524 for (i = 0; i < nsaddrs; i++) {
1525 fw->ipv6.src = saddrs[i];
1526 for (j = 0; j < ndaddrs; j++) {
1527 fw->ipv6.dst = daddrs[j];
1529 print_firewall_line(fw, *handle);
1530 ret &= ip6tc_insert_entry(chain, fw, rulenum, handle);
1537 static unsigned char *
1538 make_delete_mask(struct ip6t_entry *fw, struct ip6tables_rule_match *matches)
1540 /* Establish mask for comparison */
1542 struct ip6tables_rule_match *matchp;
1543 unsigned char *mask, *mptr;
1545 size = sizeof(struct ip6t_entry);
1546 for (matchp = matches; matchp; matchp = matchp->next)
1547 size += IP6T_ALIGN(sizeof(struct ip6t_entry_match)) + matchp->match->size;
1549 mask = fw_calloc(1, size
1550 + IP6T_ALIGN(sizeof(struct ip6t_entry_target))
1551 + ip6tables_targets->size);
1553 memset(mask, 0xFF, sizeof(struct ip6t_entry));
1554 mptr = mask + sizeof(struct ip6t_entry);
1556 for (matchp = matches; matchp; matchp = matchp->next) {
1558 IP6T_ALIGN(sizeof(struct ip6t_entry_match))
1559 + matchp->match->userspacesize);
1560 mptr += IP6T_ALIGN(sizeof(struct ip6t_entry_match)) + matchp->match->size;
1564 IP6T_ALIGN(sizeof(struct ip6t_entry_target))
1565 + ip6tables_targets->userspacesize);
1571 delete_entry(const ip6t_chainlabel chain,
1572 struct ip6t_entry *fw,
1573 unsigned int nsaddrs,
1574 const struct in6_addr saddrs[],
1575 unsigned int ndaddrs,
1576 const struct in6_addr daddrs[],
1578 ip6tc_handle_t *handle,
1579 struct ip6tables_rule_match *matches)
1583 unsigned char *mask;
1585 mask = make_delete_mask(fw, matches);
1586 for (i = 0; i < nsaddrs; i++) {
1587 fw->ipv6.src = saddrs[i];
1588 for (j = 0; j < ndaddrs; j++) {
1589 fw->ipv6.dst = daddrs[j];
1591 print_firewall_line(fw, *handle);
1592 ret &= ip6tc_delete_entry(chain, fw, mask, handle);
1601 for_each_chain(int (*fn)(const ip6t_chainlabel, int, ip6tc_handle_t *),
1602 int verbose, int builtinstoo, ip6tc_handle_t *handle)
1607 unsigned int i, chaincount = 0;
1609 chain = ip6tc_first_chain(handle);
1612 chain = ip6tc_next_chain(handle);
1615 chains = fw_malloc(sizeof(ip6t_chainlabel) * chaincount);
1617 chain = ip6tc_first_chain(handle);
1619 strcpy(chains + i*sizeof(ip6t_chainlabel), chain);
1621 chain = ip6tc_next_chain(handle);
1624 for (i = 0; i < chaincount; i++) {
1626 && ip6tc_builtin(chains + i*sizeof(ip6t_chainlabel),
1629 ret &= fn(chains + i*sizeof(ip6t_chainlabel), verbose, handle);
1637 flush_entries(const ip6t_chainlabel chain, int verbose,
1638 ip6tc_handle_t *handle)
1641 return for_each_chain(flush_entries, verbose, 1, handle);
1644 fprintf(stdout, "Flushing chain `%s'\n", chain);
1645 return ip6tc_flush_entries(chain, handle);
1649 zero_entries(const ip6t_chainlabel chain, int verbose,
1650 ip6tc_handle_t *handle)
1653 return for_each_chain(zero_entries, verbose, 1, handle);
1656 fprintf(stdout, "Zeroing chain `%s'\n", chain);
1657 return ip6tc_zero_entries(chain, handle);
1661 delete_chain(const ip6t_chainlabel chain, int verbose,
1662 ip6tc_handle_t *handle)
1665 return for_each_chain(delete_chain, verbose, 0, handle);
1668 fprintf(stdout, "Deleting chain `%s'\n", chain);
1669 return ip6tc_delete_chain(chain, handle);
1673 list_entries(const ip6t_chainlabel chain, int verbose, int numeric,
1674 int expanded, int linenumbers, ip6tc_handle_t *handle)
1677 unsigned int format;
1680 format = FMT_OPTIONS;
1682 format |= FMT_NOCOUNTS;
1687 format |= FMT_NUMERIC;
1690 format |= FMT_KILOMEGAGIGA;
1693 format |= FMT_LINENUMBERS;
1695 for (this = ip6tc_first_chain(handle);
1697 this = ip6tc_next_chain(handle)) {
1698 const struct ip6t_entry *i;
1701 if (chain && strcmp(chain, this) != 0)
1704 if (found) printf("\n");
1706 print_header(format, this, handle);
1707 i = ip6tc_first_rule(this, handle);
1712 ip6tc_get_target(i, handle),
1716 i = ip6tc_next_rule(i, handle);
1725 static char *get_modprobe(void)
1730 #define PROCFILE_BUFSIZ 1024
1731 procfile = open(PROC_SYS_MODPROBE, O_RDONLY);
1735 ret = malloc(PROCFILE_BUFSIZ);
1737 memset(ret, 0, PROCFILE_BUFSIZ);
1738 switch (read(procfile, ret, PROCFILE_BUFSIZ)) {
1740 case PROCFILE_BUFSIZ: goto fail; /* Partial read. Wierd */
1742 if (ret[strlen(ret)-1]=='\n')
1743 ret[strlen(ret)-1]=0;
1753 int ip6tables_insmod(const char *modname, const char *modprobe, int quiet)
1759 /* If they don't explicitly set it, read out of kernel */
1761 buf = get_modprobe();
1769 argv[0] = (char *)modprobe;
1770 argv[1] = (char *)modname;
1778 execv(argv[0], argv);
1780 /* not usually reached */
1785 default: /* parent */
1790 if (WIFEXITED(status) && WEXITSTATUS(status) == 0)
1795 int load_ip6tables_ko(const char *modprobe, int quiet)
1797 static int loaded = 0;
1798 static int ret = -1;
1801 ret = ip6tables_insmod("ip6_tables", modprobe, quiet);
1802 loaded = (ret == 0);
1808 static struct ip6t_entry *
1809 generate_entry(const struct ip6t_entry *fw,
1810 struct ip6tables_rule_match *matches,
1811 struct ip6t_entry_target *target)
1814 struct ip6tables_rule_match *matchp;
1815 struct ip6t_entry *e;
1817 size = sizeof(struct ip6t_entry);
1818 for (matchp = matches; matchp; matchp = matchp->next)
1819 size += matchp->match->m->u.match_size;
1821 e = fw_malloc(size + target->u.target_size);
1823 e->target_offset = size;
1824 e->next_offset = size + target->u.target_size;
1827 for (matchp = matches; matchp; matchp = matchp->next) {
1828 memcpy(e->elems + size, matchp->match->m, matchp->match->m->u.match_size);
1829 size += matchp->match->m->u.match_size;
1831 memcpy(e->elems + size, target, target->u.target_size);
1836 void clear_rule_matches(struct ip6tables_rule_match **matches)
1838 struct ip6tables_rule_match *matchp, *tmp;
1840 for (matchp = *matches; matchp;) {
1842 if (matchp->match->m) {
1843 free(matchp->match->m);
1844 matchp->match->m = NULL;
1846 if (matchp->match == matchp->match->next) {
1847 free(matchp->match);
1848 matchp->match = NULL;
1857 static void set_revision(char *name, u_int8_t revision)
1859 /* Old kernel sources don't have ".revision" field,
1860 but we stole a byte from name. */
1861 name[IP6T_FUNCTION_MAXNAMELEN - 2] = '\0';
1862 name[IP6T_FUNCTION_MAXNAMELEN - 1] = revision;
1865 int do_command6(int argc, char *argv[], char **table, ip6tc_handle_t *handle)
1867 struct ip6t_entry fw, *e = NULL;
1869 unsigned int nsaddrs = 0, ndaddrs = 0;
1870 struct in6_addr *saddrs = NULL, *daddrs = NULL;
1873 const char *chain = NULL;
1874 const char *shostnetworkmask = NULL, *dhostnetworkmask = NULL;
1875 const char *policy = NULL, *newname = NULL;
1876 unsigned int rulenum = 0, options = 0, command = 0;
1877 const char *pcnt = NULL, *bcnt = NULL;
1879 struct ip6tables_match *m;
1880 struct ip6tables_rule_match *matches = NULL;
1881 struct ip6tables_rule_match *matchp;
1882 struct ip6tables_target *target = NULL;
1883 struct ip6tables_target *t;
1884 const char *jumpto = "";
1885 char *protocol = NULL;
1888 memset(&fw, 0, sizeof(fw));
1890 /* re-set optind to 0 in case do_command gets called
1894 /* clear mflags in case do_command gets called a second time
1895 * (we clear the global list of all matches for security)*/
1896 for (m = ip6tables_matches; m; m = m->next)
1899 for (t = ip6tables_targets; t; t = t->next) {
1904 /* Suppress error messages: we may add new options if we
1905 demand-load a protocol. */
1908 while ((c = getopt_long(argc, argv,
1909 "-A:D:R:I:L::M:F::Z::N:X::E:P:Vh::o:p:s:d:j:i:bvnt:m:xc:",
1910 opts, NULL)) != -1) {
1916 add_command(&command, CMD_APPEND, CMD_NONE,
1922 add_command(&command, CMD_DELETE, CMD_NONE,
1925 if (optind < argc && argv[optind][0] != '-'
1926 && argv[optind][0] != '!') {
1927 rulenum = parse_rulenumber(argv[optind++]);
1928 command = CMD_DELETE_NUM;
1933 add_command(&command, CMD_REPLACE, CMD_NONE,
1936 if (optind < argc && argv[optind][0] != '-'
1937 && argv[optind][0] != '!')
1938 rulenum = parse_rulenumber(argv[optind++]);
1940 exit_error(PARAMETER_PROBLEM,
1941 "-%c requires a rule number",
1942 cmd2char(CMD_REPLACE));
1946 add_command(&command, CMD_INSERT, CMD_NONE,
1949 if (optind < argc && argv[optind][0] != '-'
1950 && argv[optind][0] != '!')
1951 rulenum = parse_rulenumber(argv[optind++]);
1956 add_command(&command, CMD_LIST, CMD_ZERO,
1958 if (optarg) chain = optarg;
1959 else if (optind < argc && argv[optind][0] != '-'
1960 && argv[optind][0] != '!')
1961 chain = argv[optind++];
1965 add_command(&command, CMD_FLUSH, CMD_NONE,
1967 if (optarg) chain = optarg;
1968 else if (optind < argc && argv[optind][0] != '-'
1969 && argv[optind][0] != '!')
1970 chain = argv[optind++];
1974 add_command(&command, CMD_ZERO, CMD_LIST,
1976 if (optarg) chain = optarg;
1977 else if (optind < argc && argv[optind][0] != '-'
1978 && argv[optind][0] != '!')
1979 chain = argv[optind++];
1983 if (optarg && (*optarg == '-' || *optarg == '!'))
1984 exit_error(PARAMETER_PROBLEM,
1985 "chain name not allowed to start "
1986 "with `%c'\n", *optarg);
1987 if (find_target(optarg, TRY_LOAD))
1988 exit_error(PARAMETER_PROBLEM,
1989 "chain name may not clash "
1990 "with target name\n");
1991 add_command(&command, CMD_NEW_CHAIN, CMD_NONE,
1997 add_command(&command, CMD_DELETE_CHAIN, CMD_NONE,
1999 if (optarg) chain = optarg;
2000 else if (optind < argc && argv[optind][0] != '-'
2001 && argv[optind][0] != '!')
2002 chain = argv[optind++];
2006 add_command(&command, CMD_RENAME_CHAIN, CMD_NONE,
2009 if (optind < argc && argv[optind][0] != '-'
2010 && argv[optind][0] != '!')
2011 newname = argv[optind++];
2013 exit_error(PARAMETER_PROBLEM,
2014 "-%c requires old-chain-name and "
2016 cmd2char(CMD_RENAME_CHAIN));
2020 add_command(&command, CMD_SET_POLICY, CMD_NONE,
2023 if (optind < argc && argv[optind][0] != '-'
2024 && argv[optind][0] != '!')
2025 policy = argv[optind++];
2027 exit_error(PARAMETER_PROBLEM,
2028 "-%c requires a chain and a policy",
2029 cmd2char(CMD_SET_POLICY));
2034 optarg = argv[optind];
2036 /* ip6tables -p icmp -h */
2037 if (!matches && protocol)
2038 find_match(protocol, TRY_LOAD, &matches);
2040 exit_printhelp(matches);
2046 check_inverse(optarg, &invert, &optind, argc);
2047 set_option(&options, OPT_PROTOCOL, &fw.ipv6.invflags,
2050 /* Canonicalize into lower case */
2051 for (protocol = argv[optind-1]; *protocol; protocol++)
2052 *protocol = tolower(*protocol);
2054 protocol = argv[optind-1];
2055 fw.ipv6.proto = parse_protocol(protocol);
2056 fw.ipv6.flags |= IP6T_F_PROTO;
2058 if (fw.ipv6.proto == 0
2059 && (fw.ipv6.invflags & IP6T_INV_PROTO))
2060 exit_error(PARAMETER_PROBLEM,
2061 "rule would never match protocol");
2063 if (is_exthdr(fw.ipv6.proto)
2064 && (fw.ipv6.invflags & IP6T_INV_PROTO) == 0)
2065 printf("Warning: never matched protocol: %s. "
2066 "use extension match instead.\n",
2071 check_inverse(optarg, &invert, &optind, argc);
2072 set_option(&options, OPT_SOURCE, &fw.ipv6.invflags,
2074 shostnetworkmask = argv[optind-1];
2078 check_inverse(optarg, &invert, &optind, argc);
2079 set_option(&options, OPT_DESTINATION, &fw.ipv6.invflags,
2081 dhostnetworkmask = argv[optind-1];
2085 set_option(&options, OPT_JUMP, &fw.ipv6.invflags,
2087 jumpto = parse_target(optarg);
2088 /* TRY_LOAD (may be chain name) */
2089 target = find_target(jumpto, TRY_LOAD);
2094 size = IP6T_ALIGN(sizeof(struct ip6t_entry_target))
2097 target->t = fw_calloc(1, size);
2098 target->t->u.target_size = size;
2099 strcpy(target->t->u.user.name, jumpto);
2100 if (target->init != NULL)
2101 target->init(target->t, &fw.nfcache);
2102 opts = merge_options(opts, target->extra_opts, &target->option_offset);
2108 check_inverse(optarg, &invert, &optind, argc);
2109 set_option(&options, OPT_VIANAMEIN, &fw.ipv6.invflags,
2111 parse_interface(argv[optind-1],
2113 fw.ipv6.iniface_mask);
2117 check_inverse(optarg, &invert, &optind, argc);
2118 set_option(&options, OPT_VIANAMEOUT, &fw.ipv6.invflags,
2120 parse_interface(argv[optind-1],
2122 fw.ipv6.outiface_mask);
2127 set_option(&options, OPT_VERBOSE,
2128 &fw.ipv6.invflags, invert);
2136 exit_error(PARAMETER_PROBLEM,
2137 "unexpected ! flag before --match");
2139 m = find_match(optarg, LOAD_MUST_SUCCEED, &matches);
2140 size = IP6T_ALIGN(sizeof(struct ip6t_entry_match))
2142 m->m = fw_calloc(1, size);
2143 m->m->u.match_size = size;
2144 strcpy(m->m->u.user.name, m->name);
2145 set_revision(m->m->u.user.name, m->revision);
2146 if (m->init != NULL)
2147 m->init(m->m, &fw.nfcache);
2149 /* Merge options for non-cloned matches */
2150 opts = merge_options(opts, m->extra_opts, &m->option_offset);
2155 set_option(&options, OPT_NUMERIC, &fw.ipv6.invflags,
2161 exit_error(PARAMETER_PROBLEM,
2162 "unexpected ! flag before --table");
2163 *table = argv[optind-1];
2167 set_option(&options, OPT_EXPANDED, &fw.ipv6.invflags,
2173 printf("Not %s ;-)\n", program_version);
2176 program_name, program_version);
2180 set_option(&options, OPT_LINENUMBERS, &fw.ipv6.invflags,
2190 set_option(&options, OPT_COUNTERS, &fw.ipv6.invflags,
2193 if (optind < argc && argv[optind][0] != '-'
2194 && argv[optind][0] != '!')
2195 bcnt = argv[optind++];
2197 exit_error(PARAMETER_PROBLEM,
2198 "-%c requires packet and byte counter",
2199 opt2char(OPT_COUNTERS));
2201 if (sscanf(pcnt, "%llu", (unsigned long long *)&fw.counters.pcnt) != 1)
2202 exit_error(PARAMETER_PROBLEM,
2203 "-%c packet counter not numeric",
2204 opt2char(OPT_COUNTERS));
2206 if (sscanf(bcnt, "%llu", (unsigned long long *)&fw.counters.bcnt) != 1)
2207 exit_error(PARAMETER_PROBLEM,
2208 "-%c byte counter not numeric",
2209 opt2char(OPT_COUNTERS));
2214 case 1: /* non option */
2215 if (optarg[0] == '!' && optarg[1] == '\0') {
2217 exit_error(PARAMETER_PROBLEM,
2218 "multiple consecutive ! not"
2224 printf("Bad argument `%s'\n", optarg);
2229 || !(target->parse(c - target->option_offset,
2232 &fw, &target->t))) {
2233 for (matchp = matches; matchp; matchp = matchp->next) {
2234 if (matchp->completed)
2236 if (matchp->match->parse(c - matchp->match->option_offset,
2238 &matchp->match->mflags,
2244 m = matchp ? matchp->match : NULL;
2246 /* If you listen carefully, you can
2247 actually hear this code suck. */
2249 /* some explanations (after four different bugs
2250 * in 3 different releases): If we encounter a
2251 * parameter, that has not been parsed yet,
2252 * it's not an option of an explicitly loaded
2253 * match or a target. However, we support
2254 * implicit loading of the protocol match
2255 * extension. '-p tcp' means 'l4 proto 6' and
2256 * at the same time 'load tcp protocol match on
2257 * demand if we specify --dport'.
2259 * To make this work, we need to make sure:
2260 * - the parameter has not been parsed by
2262 * - a protocol has been specified
2263 * - the protocol extension has not been
2264 * loaded yet, or is loaded and unused
2265 * [think of ip6tables-restore!]
2266 * - the protocol extension can be successively
2271 && (!find_proto(protocol, DONT_LOAD,
2272 options&OPT_NUMERIC, NULL)
2273 || (find_proto(protocol, DONT_LOAD,
2274 options&OPT_NUMERIC, NULL)
2275 && (proto_used == 0))
2277 && (m = find_proto(protocol, TRY_LOAD,
2278 options&OPT_NUMERIC, &matches))) {
2279 /* Try loading protocol */
2284 size = IP6T_ALIGN(sizeof(struct ip6t_entry_match))
2287 m->m = fw_calloc(1, size);
2288 m->m->u.match_size = size;
2289 strcpy(m->m->u.user.name, m->name);
2290 set_revision(m->m->u.user.name,
2292 if (m->init != NULL)
2293 m->init(m->m, &fw.nfcache);
2295 opts = merge_options(opts,
2296 m->extra_opts, &m->option_offset);
2303 exit_error(PARAMETER_PROBLEM,
2311 for (matchp = matches; matchp; matchp = matchp->next)
2312 matchp->match->final_check(matchp->match->mflags);
2315 target->final_check(target->tflags);
2317 /* Fix me: must put inverse options checking here --MN */
2320 exit_error(PARAMETER_PROBLEM,
2321 "unknown arguments found on commandline");
2323 exit_error(PARAMETER_PROBLEM, "no command specified");
2325 exit_error(PARAMETER_PROBLEM,
2326 "nothing appropriate following !");
2328 if (command & (CMD_REPLACE | CMD_INSERT | CMD_DELETE | CMD_APPEND)) {
2329 if (!(options & OPT_DESTINATION))
2330 dhostnetworkmask = "::0/0";
2331 if (!(options & OPT_SOURCE))
2332 shostnetworkmask = "::0/0";
2335 if (shostnetworkmask)
2336 parse_hostnetworkmask(shostnetworkmask, &saddrs,
2337 &(fw.ipv6.smsk), &nsaddrs);
2339 if (dhostnetworkmask)
2340 parse_hostnetworkmask(dhostnetworkmask, &daddrs,
2341 &(fw.ipv6.dmsk), &ndaddrs);
2343 if ((nsaddrs > 1 || ndaddrs > 1) &&
2344 (fw.ipv6.invflags & (IP6T_INV_SRCIP | IP6T_INV_DSTIP)))
2345 exit_error(PARAMETER_PROBLEM, "! not allowed with multiple"
2346 " source or destination IP addresses");
2348 if (command == CMD_REPLACE && (nsaddrs != 1 || ndaddrs != 1))
2349 exit_error(PARAMETER_PROBLEM, "Replacement rule does not "
2350 "specify a unique address");
2352 generic_opt_check(command, options);
2354 if (chain && strlen(chain) > IP6T_FUNCTION_MAXNAMELEN)
2355 exit_error(PARAMETER_PROBLEM,
2356 "chain name `%s' too long (must be under %i chars)",
2357 chain, IP6T_FUNCTION_MAXNAMELEN);
2359 /* only allocate handle if we weren't called with a handle */
2361 *handle = ip6tc_init(*table);
2363 /* try to insmod the module if iptc_init failed */
2364 if (!*handle && load_ip6tables_ko(modprobe, 0) != -1)
2365 *handle = ip6tc_init(*table);
2368 exit_error(VERSION_PROBLEM,
2369 "can't initialize ip6tables table `%s': %s",
2370 *table, ip6tc_strerror(errno));
2372 if (command == CMD_APPEND
2373 || command == CMD_DELETE
2374 || command == CMD_INSERT
2375 || command == CMD_REPLACE) {
2376 if (strcmp(chain, "PREROUTING") == 0
2377 || strcmp(chain, "INPUT") == 0) {
2378 /* -o not valid with incoming packets. */
2379 if (options & OPT_VIANAMEOUT)
2380 exit_error(PARAMETER_PROBLEM,
2381 "Can't use -%c with %s\n",
2382 opt2char(OPT_VIANAMEOUT),
2386 if (strcmp(chain, "POSTROUTING") == 0
2387 || strcmp(chain, "OUTPUT") == 0) {
2388 /* -i not valid with outgoing packets */
2389 if (options & OPT_VIANAMEIN)
2390 exit_error(PARAMETER_PROBLEM,
2391 "Can't use -%c with %s\n",
2392 opt2char(OPT_VIANAMEIN),
2396 if (target && ip6tc_is_chain(jumpto, *handle)) {
2397 printf("Warning: using chain %s, not extension\n",
2406 /* If they didn't specify a target, or it's a chain
2407 name, use standard. */
2409 && (strlen(jumpto) == 0
2410 || ip6tc_is_chain(jumpto, *handle))) {
2413 target = find_target(IP6T_STANDARD_TARGET,
2416 size = sizeof(struct ip6t_entry_target)
2418 target->t = fw_calloc(1, size);
2419 target->t->u.target_size = size;
2420 strcpy(target->t->u.user.name, jumpto);
2421 if (target->init != NULL)
2422 target->init(target->t, &fw.nfcache);
2426 /* it is no chain, and we can't load a plugin.
2427 * We cannot know if the plugin is corrupt, non
2428 * existant OR if the user just misspelled a
2430 find_target(jumpto, LOAD_MUST_SUCCEED);
2432 e = generate_entry(&fw, matches, target->t);
2439 ret = append_entry(chain, e,
2440 nsaddrs, saddrs, ndaddrs, daddrs,
2441 options&OPT_VERBOSE,
2445 ret = delete_entry(chain, e,
2446 nsaddrs, saddrs, ndaddrs, daddrs,
2447 options&OPT_VERBOSE,
2450 case CMD_DELETE_NUM:
2451 ret = ip6tc_delete_num_entry(chain, rulenum - 1, handle);
2454 ret = replace_entry(chain, e, rulenum - 1,
2455 saddrs, daddrs, options&OPT_VERBOSE,
2459 ret = insert_entry(chain, e, rulenum - 1,
2460 nsaddrs, saddrs, ndaddrs, daddrs,
2461 options&OPT_VERBOSE,
2465 ret = list_entries(chain,
2466 options&OPT_VERBOSE,
2467 options&OPT_NUMERIC,
2468 options&OPT_EXPANDED,
2469 options&OPT_LINENUMBERS,
2473 ret = flush_entries(chain, options&OPT_VERBOSE, handle);
2476 ret = zero_entries(chain, options&OPT_VERBOSE, handle);
2478 case CMD_LIST|CMD_ZERO:
2479 ret = list_entries(chain,
2480 options&OPT_VERBOSE,
2481 options&OPT_NUMERIC,
2482 options&OPT_EXPANDED,
2483 options&OPT_LINENUMBERS,
2486 ret = zero_entries(chain,
2487 options&OPT_VERBOSE, handle);
2490 ret = ip6tc_create_chain(chain, handle);
2492 case CMD_DELETE_CHAIN:
2493 ret = delete_chain(chain, options&OPT_VERBOSE, handle);
2495 case CMD_RENAME_CHAIN:
2496 ret = ip6tc_rename_chain(chain, newname, handle);
2498 case CMD_SET_POLICY:
2499 ret = ip6tc_set_policy(chain, policy, NULL, handle);
2502 /* We should never reach this... */
2507 dump_entries6(*handle);
2509 clear_rule_matches(&matches);
2516 for (c = 0; c < nsaddrs; c++)
2519 for (c = 0; c < ndaddrs; c++)