1 /* Code to take an iptables-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.
41 #include <sys/utsname.h>
50 #define FMT_NUMERIC 0x0001
51 #define FMT_NOCOUNTS 0x0002
52 #define FMT_KILOMEGAGIGA 0x0004
53 #define FMT_OPTIONS 0x0008
54 #define FMT_NOTABLE 0x0010
55 #define FMT_NOTARGET 0x0020
56 #define FMT_VIA 0x0040
57 #define FMT_NONEWLINE 0x0080
58 #define FMT_LINENUMBERS 0x0100
60 #define FMT_PRINT_RULE (FMT_NOCOUNTS | FMT_OPTIONS | FMT_VIA \
61 | FMT_NUMERIC | FMT_NOTABLE)
62 #define FMT(tab,notab) ((format) & FMT_NOTABLE ? (notab) : (tab))
65 #define CMD_NONE 0x0000U
66 #define CMD_INSERT 0x0001U
67 #define CMD_DELETE 0x0002U
68 #define CMD_DELETE_NUM 0x0004U
69 #define CMD_REPLACE 0x0008U
70 #define CMD_APPEND 0x0010U
71 #define CMD_LIST 0x0020U
72 #define CMD_FLUSH 0x0040U
73 #define CMD_ZERO 0x0080U
74 #define CMD_NEW_CHAIN 0x0100U
75 #define CMD_DELETE_CHAIN 0x0200U
76 #define CMD_SET_POLICY 0x0400U
77 #define CMD_RENAME_CHAIN 0x0800U
78 #define CMD_LIST_RULES 0x1000U
79 #define NUMBER_OF_CMD 14
80 static const char cmdflags[] = { 'I', 'D', 'D', 'R', 'A', 'L', 'F', 'Z',
81 'N', 'X', 'P', 'E', 'S' };
83 #define OPTION_OFFSET 256
85 #define OPT_NONE 0x00000U
86 #define OPT_NUMERIC 0x00001U
87 #define OPT_SOURCE 0x00002U
88 #define OPT_DESTINATION 0x00004U
89 #define OPT_PROTOCOL 0x00008U
90 #define OPT_JUMP 0x00010U
91 #define OPT_VERBOSE 0x00020U
92 #define OPT_EXPANDED 0x00040U
93 #define OPT_VIANAMEIN 0x00080U
94 #define OPT_VIANAMEOUT 0x00100U
95 #define OPT_FRAGMENT 0x00200U
96 #define OPT_LINENUMBERS 0x00400U
97 #define OPT_COUNTERS 0x00800U
98 #define NUMBER_OF_OPT 12
99 static const char optflags[NUMBER_OF_OPT]
100 = { 'n', 's', 'd', 'p', 'j', 'v', 'x', 'i', 'o', 'f', '0', 'c'};
102 static struct option original_opts[] = {
103 {.name = "append", .has_arg = 1, .val = 'A'},
104 {.name = "delete", .has_arg = 1, .val = 'D'},
105 {.name = "insert", .has_arg = 1, .val = 'I'},
106 {.name = "replace", .has_arg = 1, .val = 'R'},
107 {.name = "list", .has_arg = 2, .val = 'L'},
108 {.name = "list-rules", .has_arg = 2, .val = 'S'},
109 {.name = "flush", .has_arg = 2, .val = 'F'},
110 {.name = "zero", .has_arg = 2, .val = 'Z'},
111 {.name = "new-chain", .has_arg = 1, .val = 'N'},
112 {.name = "delete-chain", .has_arg = 2, .val = 'X'},
113 {.name = "rename-chain", .has_arg = 1, .val = 'E'},
114 {.name = "policy", .has_arg = 1, .val = 'P'},
115 {.name = "source", .has_arg = 1, .val = 's'},
116 {.name = "destination", .has_arg = 1, .val = 'd'},
117 {.name = "src", .has_arg = 1, .val = 's'}, /* synonym */
118 {.name = "dst", .has_arg = 1, .val = 'd'}, /* synonym */
119 {.name = "protocol", .has_arg = 1, .val = 'p'},
120 {.name = "in-interface", .has_arg = 1, .val = 'i'},
121 {.name = "jump", .has_arg = 1, .val = 'j'},
122 {.name = "table", .has_arg = 1, .val = 't'},
123 {.name = "match", .has_arg = 1, .val = 'm'},
124 {.name = "numeric", .has_arg = 0, .val = 'n'},
125 {.name = "out-interface", .has_arg = 1, .val = 'o'},
126 {.name = "verbose", .has_arg = 0, .val = 'v'},
127 {.name = "exact", .has_arg = 0, .val = 'x'},
128 {.name = "fragments", .has_arg = 0, .val = 'f'},
129 {.name = "version", .has_arg = 0, .val = 'V'},
130 {.name = "help", .has_arg = 2, .val = 'h'},
131 {.name = "line-numbers", .has_arg = 0, .val = '0'},
132 {.name = "modprobe", .has_arg = 1, .val = 'M'},
133 {.name = "set-counters", .has_arg = 1, .val = 'c'},
134 {.name = "goto", .has_arg = 1, .val = 'g'},
138 /* we need this for iptables-restore. iptables-restore.c sets line to the
139 * current line of the input file, in order to give a more precise error
140 * message. iptables itself doesn't need this, so it is initialized to the
141 * magic number of -1 */
144 static struct option *opts = original_opts;
145 static unsigned int global_option_offset = 0;
147 /* Table of legal combinations of commands and options. If any of the
148 * given commands make an option legal, that option is legal (applies to
149 * CMD_LIST and CMD_ZERO only).
156 static char commands_v_options[NUMBER_OF_CMD][NUMBER_OF_OPT] =
157 /* Well, it's better than "Re: Linux vs FreeBSD" */
159 /* -n -s -d -p -j -v -x -i -o -f --line -c */
160 /*INSERT*/ {'x',' ',' ',' ',' ',' ','x',' ',' ',' ','x',' '},
161 /*DELETE*/ {'x',' ',' ',' ',' ',' ','x',' ',' ',' ','x','x'},
162 /*DELETE_NUM*/{'x','x','x','x','x',' ','x','x','x','x','x','x'},
163 /*REPLACE*/ {'x',' ',' ',' ',' ',' ','x',' ',' ',' ','x',' '},
164 /*APPEND*/ {'x',' ',' ',' ',' ',' ','x',' ',' ',' ','x',' '},
165 /*LIST*/ {' ','x','x','x','x',' ',' ','x','x','x',' ','x'},
166 /*FLUSH*/ {'x','x','x','x','x',' ','x','x','x','x','x','x'},
167 /*ZERO*/ {'x','x','x','x','x',' ','x','x','x','x','x','x'},
168 /*NEW_CHAIN*/ {'x','x','x','x','x',' ','x','x','x','x','x','x'},
169 /*DEL_CHAIN*/ {'x','x','x','x','x',' ','x','x','x','x','x','x'},
170 /*SET_POLICY*/{'x','x','x','x','x',' ','x','x','x','x','x',' '},
171 /*RENAME*/ {'x','x','x','x','x',' ','x','x','x','x','x','x'},
172 /*LIST_RULES*/{'x','x','x','x','x',' ','x','x','x','x','x','x'}
175 static int inverse_for_options[NUMBER_OF_OPT] =
178 /* -s */ IPT_INV_SRCIP,
179 /* -d */ IPT_INV_DSTIP,
180 /* -p */ IPT_INV_PROTO,
184 /* -i */ IPT_INV_VIA_IN,
185 /* -o */ IPT_INV_VIA_OUT,
186 /* -f */ IPT_INV_FRAG,
191 const char *program_version;
192 const char *program_name;
196 /* A few hardcoded protocols for 'all' and in case the user has no
203 struct afinfo afinfo = {
205 .libprefix = "libipt_",
206 .ipproto = IPPROTO_IP,
208 .so_rev_match = IPT_SO_GET_REVISION_MATCH,
209 .so_rev_target = IPT_SO_GET_REVISION_TARGET,
212 /* Primitive headers... */
213 /* defined in netinet/in.h */
216 #define IPPROTO_ESP 50
219 #define IPPROTO_AH 51
223 static const struct pprot chain_protos[] = {
224 { "tcp", IPPROTO_TCP },
225 { "udp", IPPROTO_UDP },
226 { "udplite", IPPROTO_UDPLITE },
227 { "icmp", IPPROTO_ICMP },
228 { "esp", IPPROTO_ESP },
229 { "ah", IPPROTO_AH },
230 { "sctp", IPPROTO_SCTP },
235 proto_to_name(u_int8_t proto, int nolookup)
239 if (proto && !nolookup) {
240 struct protoent *pent = getprotobynumber(proto);
245 for (i = 0; i < sizeof(chain_protos)/sizeof(struct pprot); i++)
246 if (chain_protos[i].num == proto)
247 return chain_protos[i].name;
257 static void free_opts(int reset_offset)
259 if (opts != original_opts) {
261 opts = original_opts;
263 global_option_offset = 0;
268 exit_tryhelp(int status)
271 fprintf(stderr, "Error occurred at line: %d\n", line);
272 fprintf(stderr, "Try `%s -h' or '%s --help' for more information.\n",
273 program_name, program_name );
279 exit_printhelp(struct iptables_rule_match *matches)
281 struct iptables_rule_match *matchp = NULL;
282 struct xtables_target *t = NULL;
285 "Usage: %s -[AD] chain rule-specification [options]\n"
286 " %s -[RI] chain rulenum rule-specification [options]\n"
287 " %s -D chain rulenum [options]\n"
288 " %s -[LS] [chain [rulenum]] [options]\n"
289 " %s -[FZ] [chain] [options]\n"
291 " %s -E old-chain-name new-chain-name\n"
292 " %s -P chain target [options]\n"
293 " %s -h (print this help information)\n\n",
294 program_name, program_version, program_name, program_name,
295 program_name, program_name, program_name, program_name,
296 program_name, program_name, program_name);
300 "Either long or short options are allowed.\n"
301 " --append -A chain Append to chain\n"
302 " --delete -D chain Delete matching rule from chain\n"
303 " --delete -D chain rulenum\n"
304 " Delete rule rulenum (1 = first) from chain\n"
305 " --insert -I chain [rulenum]\n"
306 " Insert in chain as rulenum (default 1=first)\n"
307 " --replace -R chain rulenum\n"
308 " Replace rule rulenum (1 = first) in chain\n"
309 " --list -L [chain [rulenum]]\n"
310 " List the rules in a chain or all chains\n"
311 " --list-rules -S [chain [rulenum]]\n"
312 " Print the rules in a chain or all chains\n"
313 " --flush -F [chain] Delete all rules in chain or all chains\n"
314 " --zero -Z [chain] Zero counters in chain or all chains\n"
315 " --new -N chain Create a new user-defined chain\n"
317 " -X [chain] Delete a user-defined chain\n"
318 " --policy -P chain target\n"
319 " Change policy on chain to target\n"
321 " -E old-chain new-chain\n"
322 " Change chain name, (moving any references)\n"
325 " --proto -p [!] proto protocol: by number or name, eg. `tcp'\n"
326 " --source -s [!] address[/mask]\n"
327 " source specification\n"
328 " --destination -d [!] address[/mask]\n"
329 " destination specification\n"
330 " --in-interface -i [!] input name[+]\n"
331 " network interface name ([+] for wildcard)\n"
332 " --jump -j target\n"
333 " target for rule (may load target extension)\n"
336 " jump to chain with no return\n"
338 " --match -m match\n"
339 " extended match (may load extension)\n"
340 " --numeric -n numeric output of addresses and ports\n"
341 " --out-interface -o [!] output name[+]\n"
342 " network interface name ([+] for wildcard)\n"
343 " --table -t table table to manipulate (default: `filter')\n"
344 " --verbose -v verbose mode\n"
345 " --line-numbers print line numbers when listing\n"
346 " --exact -x expand numbers (display exact values)\n"
347 "[!] --fragment -f match second or further fragments only\n"
348 " --modprobe=<command> try to insert modules using this command\n"
349 " --set-counters PKTS BYTES set the counter during insert/append\n"
350 "[!] --version -V print package version.\n");
352 /* Print out any special helps. A user might like to be able
353 to add a --help to the commandline, and see expected
354 results. So we call help for all specified matches & targets */
355 for (t = xtables_targets; t ;t = t->next) {
361 for (matchp = matches; matchp; matchp = matchp->next) {
363 matchp->match->help();
369 exit_error(enum exittype status, const char *msg, ...)
374 fprintf(stderr, "%s v%s: ", program_name, program_version);
375 vfprintf(stderr, msg, args);
377 fprintf(stderr, "\n");
378 if (status == PARAMETER_PROBLEM)
379 exit_tryhelp(status);
380 if (status == VERSION_PROBLEM)
382 "Perhaps iptables or your kernel needs to be upgraded.\n");
383 /* On error paths, make sure that we don't leak memory */
389 generic_opt_check(int command, int options)
393 /* Check that commands are valid with options. Complicated by the
394 * fact that if an option is legal with *any* command given, it is
395 * legal overall (ie. -z and -l).
397 for (i = 0; i < NUMBER_OF_OPT; i++) {
398 legal = 0; /* -1 => illegal, 1 => legal, 0 => undecided. */
400 for (j = 0; j < NUMBER_OF_CMD; j++) {
401 if (!(command & (1<<j)))
404 if (!(options & (1<<i))) {
405 if (commands_v_options[j][i] == '+')
406 exit_error(PARAMETER_PROBLEM,
407 "You need to supply the `-%c' "
408 "option for this command\n",
411 if (commands_v_options[j][i] != 'x')
418 exit_error(PARAMETER_PROBLEM,
419 "Illegal option `-%c' with this command\n",
428 for (ptr = optflags; option > 1; option >>= 1, ptr++);
437 for (ptr = cmdflags; option > 1; option >>= 1, ptr++);
443 add_command(unsigned int *cmd, const int newcmd, const int othercmds,
447 exit_error(PARAMETER_PROBLEM, "unexpected ! flag");
448 if (*cmd & (~othercmds))
449 exit_error(PARAMETER_PROBLEM, "Can't use -%c with -%c\n",
450 cmd2char(newcmd), cmd2char(*cmd & (~othercmds)));
455 check_inverse(const char option[], int *invert, int *my_optind, int argc)
457 if (option && strcmp(option, "!") == 0) {
459 exit_error(PARAMETER_PROBLEM,
460 "Multiple `!' flags not allowed");
462 if (my_optind != NULL) {
464 if (argc && *my_optind > argc)
465 exit_error(PARAMETER_PROBLEM,
466 "no argument following `!'");
475 * All functions starting with "parse" should succeed, otherwise
477 * Most routines return pointers to static data that may change
478 * between calls to the same or other routines with a few exceptions:
479 * "host_to_addr", "parse_hostnetwork", and "parse_hostnetworkmask"
480 * return global static data.
483 /* Christophe Burki wants `-p 6' to imply `-m tcp'. */
484 static struct xtables_match *
485 find_proto(const char *pname, enum ipt_tryload tryload, int nolookup, struct iptables_rule_match **matches)
489 if (string_to_number(pname, 0, 255, &proto) != -1) {
490 char *protoname = proto_to_name(proto, nolookup);
493 return find_match(protoname, tryload, matches);
495 return find_match(pname, tryload, matches);
501 parse_protocol(const char *s)
505 if (string_to_number(s, 0, 255, &proto) == -1) {
506 struct protoent *pent;
508 /* first deal with the special case of 'all' to prevent
509 * people from being able to redefine 'all' in nsswitch
510 * and/or provoke expensive [not working] ldap/nis/...
512 if (!strcmp(s, "all"))
515 if ((pent = getprotobyname(s)))
516 proto = pent->p_proto;
520 i < sizeof(chain_protos)/sizeof(struct pprot);
522 if (strcmp(s, chain_protos[i].name) == 0) {
523 proto = chain_protos[i].num;
527 if (i == sizeof(chain_protos)/sizeof(struct pprot))
528 exit_error(PARAMETER_PROBLEM,
529 "unknown protocol `%s' specified",
534 return (u_int16_t)proto;
539 parse_rulenumber(const char *rule)
541 unsigned int rulenum;
543 if (string_to_number(rule, 1, INT_MAX, &rulenum) == -1)
544 exit_error(PARAMETER_PROBLEM,
545 "Invalid rule number `%s'", rule);
551 parse_target(const char *targetname)
555 if (strlen(targetname) < 1)
556 exit_error(PARAMETER_PROBLEM,
557 "Invalid target name (too short)");
559 if (strlen(targetname)+1 > sizeof(ipt_chainlabel))
560 exit_error(PARAMETER_PROBLEM,
561 "Invalid target name `%s' (%u chars max)",
562 targetname, (unsigned int)sizeof(ipt_chainlabel)-1);
564 for (ptr = targetname; *ptr; ptr++)
566 exit_error(PARAMETER_PROBLEM,
567 "Invalid target name `%s'", targetname);
572 set_option(unsigned int *options, unsigned int option, u_int8_t *invflg,
575 if (*options & option)
576 exit_error(PARAMETER_PROBLEM, "multiple -%c flags not allowed",
582 for (i = 0; 1 << i != option; i++);
584 if (!inverse_for_options[i])
585 exit_error(PARAMETER_PROBLEM,
586 "cannot have ! before -%c",
588 *invflg |= inverse_for_options[i];
592 static struct option *
593 merge_options(struct option *oldopts, const struct option *newopts,
594 unsigned int *option_offset)
596 unsigned int num_old, num_new, i;
597 struct option *merge;
602 for (num_old = 0; oldopts[num_old].name; num_old++);
603 for (num_new = 0; newopts[num_new].name; num_new++);
605 global_option_offset += OPTION_OFFSET;
606 *option_offset = global_option_offset;
608 merge = malloc(sizeof(struct option) * (num_new + num_old + 1));
611 memcpy(merge, oldopts, num_old * sizeof(struct option));
612 free_opts(0); /* Release previous options merged if any */
613 for (i = 0; i < num_new; i++) {
614 merge[num_old + i] = newopts[i];
615 merge[num_old + i].val += *option_offset;
617 memset(merge + num_old + num_new, 0, sizeof(struct option));
623 print_num(u_int64_t number, unsigned int format)
625 if (format & FMT_KILOMEGAGIGA) {
626 if (number > 99999) {
627 number = (number + 500) / 1000;
629 number = (number + 500) / 1000;
631 number = (number + 500) / 1000;
633 number = (number + 500) / 1000;
634 printf(FMT("%4lluT ","%lluT "), (unsigned long long)number);
636 else printf(FMT("%4lluG ","%lluG "), (unsigned long long)number);
638 else printf(FMT("%4lluM ","%lluM "), (unsigned long long)number);
640 printf(FMT("%4lluK ","%lluK "), (unsigned long long)number);
642 printf(FMT("%5llu ","%llu "), (unsigned long long)number);
644 printf(FMT("%8llu ","%llu "), (unsigned long long)number);
649 print_header(unsigned int format, const char *chain, iptc_handle_t *handle)
651 struct ipt_counters counters;
652 const char *pol = iptc_get_policy(chain, &counters, handle);
653 printf("Chain %s", chain);
655 printf(" (policy %s", pol);
656 if (!(format & FMT_NOCOUNTS)) {
658 print_num(counters.pcnt, (format|FMT_NOTABLE));
659 fputs("packets, ", stdout);
660 print_num(counters.bcnt, (format|FMT_NOTABLE));
661 fputs("bytes", stdout);
666 if (!iptc_get_references(&refs, chain, handle))
667 printf(" (ERROR obtaining refs)\n");
669 printf(" (%u references)\n", refs);
672 if (format & FMT_LINENUMBERS)
673 printf(FMT("%-4s ", "%s "), "num");
674 if (!(format & FMT_NOCOUNTS)) {
675 if (format & FMT_KILOMEGAGIGA) {
676 printf(FMT("%5s ","%s "), "pkts");
677 printf(FMT("%5s ","%s "), "bytes");
679 printf(FMT("%8s ","%s "), "pkts");
680 printf(FMT("%10s ","%s "), "bytes");
683 if (!(format & FMT_NOTARGET))
684 printf(FMT("%-9s ","%s "), "target");
685 fputs(" prot ", stdout);
686 if (format & FMT_OPTIONS)
687 fputs("opt", stdout);
688 if (format & FMT_VIA) {
689 printf(FMT(" %-6s ","%s "), "in");
690 printf(FMT("%-6s ","%s "), "out");
692 printf(FMT(" %-19s ","%s "), "source");
693 printf(FMT(" %-19s "," %s "), "destination");
699 print_match(const struct ipt_entry_match *m,
700 const struct ipt_ip *ip,
703 struct xtables_match *match = find_match(m->u.user.name, TRY_LOAD, NULL);
707 match->print(ip, m, numeric);
709 printf("%s ", match->name);
711 if (m->u.user.name[0])
712 printf("UNKNOWN match `%s' ", m->u.user.name);
714 /* Don't stop iterating. */
718 /* e is called `fw' here for historical reasons */
720 print_firewall(const struct ipt_entry *fw,
721 const char *targname,
724 const iptc_handle_t handle)
726 struct xtables_target *target = NULL;
727 const struct ipt_entry_target *t;
731 if (!iptc_is_chain(targname, handle))
732 target = find_target(targname, TRY_LOAD);
734 target = find_target(IPT_STANDARD_TARGET, LOAD_MUST_SUCCEED);
736 t = ipt_get_target((struct ipt_entry *)fw);
737 flags = fw->ip.flags;
739 if (format & FMT_LINENUMBERS)
740 printf(FMT("%-4u ", "%u "), num);
742 if (!(format & FMT_NOCOUNTS)) {
743 print_num(fw->counters.pcnt, format);
744 print_num(fw->counters.bcnt, format);
747 if (!(format & FMT_NOTARGET))
748 printf(FMT("%-9s ", "%s "), targname);
750 fputc(fw->ip.invflags & IPT_INV_PROTO ? '!' : ' ', stdout);
752 char *pname = proto_to_name(fw->ip.proto, format&FMT_NUMERIC);
754 printf(FMT("%-5s", "%s "), pname);
756 printf(FMT("%-5hu", "%hu "), fw->ip.proto);
759 if (format & FMT_OPTIONS) {
760 if (format & FMT_NOTABLE)
761 fputs("opt ", stdout);
762 fputc(fw->ip.invflags & IPT_INV_FRAG ? '!' : '-', stdout);
763 fputc(flags & IPT_F_FRAG ? 'f' : '-', stdout);
767 if (format & FMT_VIA) {
768 char iface[IFNAMSIZ+2];
770 if (fw->ip.invflags & IPT_INV_VIA_IN) {
774 else iface[0] = '\0';
776 if (fw->ip.iniface[0] != '\0') {
777 strcat(iface, fw->ip.iniface);
779 else if (format & FMT_NUMERIC) strcat(iface, "*");
780 else strcat(iface, "any");
781 printf(FMT(" %-6s ","in %s "), iface);
783 if (fw->ip.invflags & IPT_INV_VIA_OUT) {
787 else iface[0] = '\0';
789 if (fw->ip.outiface[0] != '\0') {
790 strcat(iface, fw->ip.outiface);
792 else if (format & FMT_NUMERIC) strcat(iface, "*");
793 else strcat(iface, "any");
794 printf(FMT("%-6s ","out %s "), iface);
797 fputc(fw->ip.invflags & IPT_INV_SRCIP ? '!' : ' ', stdout);
798 if (fw->ip.smsk.s_addr == 0L && !(format & FMT_NUMERIC))
799 printf(FMT("%-19s ","%s "), "anywhere");
801 if (format & FMT_NUMERIC)
802 sprintf(buf, "%s", ipaddr_to_numeric(&fw->ip.src));
804 sprintf(buf, "%s", ipaddr_to_anyname(&fw->ip.src));
805 strcat(buf, ipmask_to_numeric(&fw->ip.smsk));
806 printf(FMT("%-19s ","%s "), buf);
809 fputc(fw->ip.invflags & IPT_INV_DSTIP ? '!' : ' ', stdout);
810 if (fw->ip.dmsk.s_addr == 0L && !(format & FMT_NUMERIC))
811 printf(FMT("%-19s ","-> %s"), "anywhere");
813 if (format & FMT_NUMERIC)
814 sprintf(buf, "%s", ipaddr_to_numeric(&fw->ip.dst));
816 sprintf(buf, "%s", ipaddr_to_anyname(&fw->ip.dst));
817 strcat(buf, ipmask_to_numeric(&fw->ip.dmsk));
818 printf(FMT("%-19s ","-> %s"), buf);
821 if (format & FMT_NOTABLE)
825 if(fw->ip.flags & IPT_F_GOTO)
829 IPT_MATCH_ITERATE(fw, print_match, &fw->ip, format & FMT_NUMERIC);
833 /* Print the target information. */
834 target->print(&fw->ip, t, format & FMT_NUMERIC);
835 } else if (t->u.target_size != sizeof(*t))
836 printf("[%u bytes of unknown target data] ",
837 (unsigned int)(t->u.target_size - sizeof(*t)));
839 if (!(format & FMT_NONEWLINE))
844 print_firewall_line(const struct ipt_entry *fw,
845 const iptc_handle_t h)
847 struct ipt_entry_target *t;
849 t = ipt_get_target((struct ipt_entry *)fw);
850 print_firewall(fw, t->u.user.name, 0, FMT_PRINT_RULE, h);
854 append_entry(const ipt_chainlabel chain,
855 struct ipt_entry *fw,
856 unsigned int nsaddrs,
857 const struct in_addr saddrs[],
858 unsigned int ndaddrs,
859 const struct in_addr daddrs[],
861 iptc_handle_t *handle)
866 for (i = 0; i < nsaddrs; i++) {
867 fw->ip.src.s_addr = saddrs[i].s_addr;
868 for (j = 0; j < ndaddrs; j++) {
869 fw->ip.dst.s_addr = daddrs[j].s_addr;
871 print_firewall_line(fw, *handle);
872 ret &= iptc_append_entry(chain, fw, handle);
880 replace_entry(const ipt_chainlabel chain,
881 struct ipt_entry *fw,
882 unsigned int rulenum,
883 const struct in_addr *saddr,
884 const struct in_addr *daddr,
886 iptc_handle_t *handle)
888 fw->ip.src.s_addr = saddr->s_addr;
889 fw->ip.dst.s_addr = daddr->s_addr;
892 print_firewall_line(fw, *handle);
893 return iptc_replace_entry(chain, fw, rulenum, handle);
897 insert_entry(const ipt_chainlabel chain,
898 struct ipt_entry *fw,
899 unsigned int rulenum,
900 unsigned int nsaddrs,
901 const struct in_addr saddrs[],
902 unsigned int ndaddrs,
903 const struct in_addr daddrs[],
905 iptc_handle_t *handle)
910 for (i = 0; i < nsaddrs; i++) {
911 fw->ip.src.s_addr = saddrs[i].s_addr;
912 for (j = 0; j < ndaddrs; j++) {
913 fw->ip.dst.s_addr = daddrs[j].s_addr;
915 print_firewall_line(fw, *handle);
916 ret &= iptc_insert_entry(chain, fw, rulenum, handle);
923 static unsigned char *
924 make_delete_mask(struct ipt_entry *fw, struct iptables_rule_match *matches)
926 /* Establish mask for comparison */
928 struct iptables_rule_match *matchp;
929 unsigned char *mask, *mptr;
931 size = sizeof(struct ipt_entry);
932 for (matchp = matches; matchp; matchp = matchp->next)
933 size += IPT_ALIGN(sizeof(struct ipt_entry_match)) + matchp->match->size;
935 mask = fw_calloc(1, size
936 + IPT_ALIGN(sizeof(struct ipt_entry_target))
937 + xtables_targets->size);
939 memset(mask, 0xFF, sizeof(struct ipt_entry));
940 mptr = mask + sizeof(struct ipt_entry);
942 for (matchp = matches; matchp; matchp = matchp->next) {
944 IPT_ALIGN(sizeof(struct ipt_entry_match))
945 + matchp->match->userspacesize);
946 mptr += IPT_ALIGN(sizeof(struct ipt_entry_match)) + matchp->match->size;
950 IPT_ALIGN(sizeof(struct ipt_entry_target))
951 + xtables_targets->userspacesize);
957 delete_entry(const ipt_chainlabel chain,
958 struct ipt_entry *fw,
959 unsigned int nsaddrs,
960 const struct in_addr saddrs[],
961 unsigned int ndaddrs,
962 const struct in_addr daddrs[],
964 iptc_handle_t *handle,
965 struct iptables_rule_match *matches)
971 mask = make_delete_mask(fw, matches);
972 for (i = 0; i < nsaddrs; i++) {
973 fw->ip.src.s_addr = saddrs[i].s_addr;
974 for (j = 0; j < ndaddrs; j++) {
975 fw->ip.dst.s_addr = daddrs[j].s_addr;
977 print_firewall_line(fw, *handle);
978 ret &= iptc_delete_entry(chain, fw, mask, handle);
987 for_each_chain(int (*fn)(const ipt_chainlabel, int, iptc_handle_t *),
988 int verbose, int builtinstoo, iptc_handle_t *handle)
993 unsigned int i, chaincount = 0;
995 chain = iptc_first_chain(handle);
998 chain = iptc_next_chain(handle);
1001 chains = fw_malloc(sizeof(ipt_chainlabel) * chaincount);
1003 chain = iptc_first_chain(handle);
1005 strcpy(chains + i*sizeof(ipt_chainlabel), chain);
1007 chain = iptc_next_chain(handle);
1010 for (i = 0; i < chaincount; i++) {
1012 && iptc_builtin(chains + i*sizeof(ipt_chainlabel),
1015 ret &= fn(chains + i*sizeof(ipt_chainlabel), verbose, handle);
1023 flush_entries(const ipt_chainlabel chain, int verbose,
1024 iptc_handle_t *handle)
1027 return for_each_chain(flush_entries, verbose, 1, handle);
1030 fprintf(stdout, "Flushing chain `%s'\n", chain);
1031 return iptc_flush_entries(chain, handle);
1035 zero_entries(const ipt_chainlabel chain, int verbose,
1036 iptc_handle_t *handle)
1039 return for_each_chain(zero_entries, verbose, 1, handle);
1042 fprintf(stdout, "Zeroing chain `%s'\n", chain);
1043 return iptc_zero_entries(chain, handle);
1047 delete_chain(const ipt_chainlabel chain, int verbose,
1048 iptc_handle_t *handle)
1051 return for_each_chain(delete_chain, verbose, 0, handle);
1054 fprintf(stdout, "Deleting chain `%s'\n", chain);
1055 return iptc_delete_chain(chain, handle);
1059 list_entries(const ipt_chainlabel chain, int rulenum, int verbose, int numeric,
1060 int expanded, int linenumbers, iptc_handle_t *handle)
1063 unsigned int format;
1066 format = FMT_OPTIONS;
1068 format |= FMT_NOCOUNTS;
1073 format |= FMT_NUMERIC;
1076 format |= FMT_KILOMEGAGIGA;
1079 format |= FMT_LINENUMBERS;
1081 for (this = iptc_first_chain(handle);
1083 this = iptc_next_chain(handle)) {
1084 const struct ipt_entry *i;
1087 if (chain && strcmp(chain, this) != 0)
1090 if (found) printf("\n");
1093 print_header(format, this, handle);
1094 i = iptc_first_rule(this, handle);
1099 if (!rulenum || num == rulenum)
1101 iptc_get_target(i, handle),
1105 i = iptc_next_rule(i, handle);
1114 static void print_proto(u_int16_t proto, int invert)
1118 const char *invertstr = invert ? "! " : "";
1120 struct protoent *pent = getprotobynumber(proto);
1122 printf("-p %s%s ", invertstr, pent->p_name);
1126 for (i = 0; i < sizeof(chain_protos)/sizeof(struct pprot); i++)
1127 if (chain_protos[i].num == proto) {
1129 invertstr, chain_protos[i].name);
1133 printf("-p %s%u ", invertstr, proto);
1137 #define IP_PARTS_NATIVE(n) \
1138 (unsigned int)((n)>>24)&0xFF, \
1139 (unsigned int)((n)>>16)&0xFF, \
1140 (unsigned int)((n)>>8)&0xFF, \
1141 (unsigned int)((n)&0xFF)
1143 #define IP_PARTS(n) IP_PARTS_NATIVE(ntohl(n))
1145 /* This assumes that mask is contiguous, and byte-bounded. */
1147 print_iface(char letter, const char *iface, const unsigned char *mask,
1155 printf("-%c %s", letter, invert ? "! " : "");
1157 for (i = 0; i < IFNAMSIZ; i++) {
1159 if (iface[i] != '\0')
1160 printf("%c", iface[i]);
1162 /* we can access iface[i-1] here, because
1163 * a few lines above we make sure that mask[0] != 0 */
1164 if (iface[i-1] != '\0')
1173 static int print_match_save(const struct ipt_entry_match *e,
1174 const struct ipt_ip *ip)
1176 struct xtables_match *match
1177 = find_match(e->u.user.name, TRY_LOAD, NULL);
1180 printf("-m %s ", e->u.user.name);
1182 /* some matches don't provide a save function */
1186 if (e->u.match_size) {
1188 "Can't find library for match `%s'\n",
1196 /* print a given ip including mask if neccessary */
1197 static void print_ip(char *prefix, u_int32_t ip, u_int32_t mask, int invert)
1199 u_int32_t bits, hmask = ntohl(mask);
1202 if (!mask && !ip && !invert)
1205 printf("%s %s%u.%u.%u.%u",
1210 if (mask == 0xFFFFFFFFU) {
1217 while (--i >= 0 && hmask != bits)
1222 printf("/%u.%u.%u.%u ", IP_PARTS(mask));
1225 /* We want this to be readable, so only print out neccessary fields.
1226 * Because that's the kind of world I want to live in. */
1227 void print_rule(const struct ipt_entry *e,
1228 iptc_handle_t *h, const char *chain, int counters)
1230 struct ipt_entry_target *t;
1231 const char *target_name;
1233 /* print counters for iptables-save */
1235 printf("[%llu:%llu] ", (unsigned long long)e->counters.pcnt, (unsigned long long)e->counters.bcnt);
1237 /* print chain name */
1238 printf("-A %s ", chain);
1240 /* Print IP part. */
1241 print_ip("-s", e->ip.src.s_addr,e->ip.smsk.s_addr,
1242 e->ip.invflags & IPT_INV_SRCIP);
1244 print_ip("-d", e->ip.dst.s_addr, e->ip.dmsk.s_addr,
1245 e->ip.invflags & IPT_INV_DSTIP);
1247 print_iface('i', e->ip.iniface, e->ip.iniface_mask,
1248 e->ip.invflags & IPT_INV_VIA_IN);
1250 print_iface('o', e->ip.outiface, e->ip.outiface_mask,
1251 e->ip.invflags & IPT_INV_VIA_OUT);
1253 print_proto(e->ip.proto, e->ip.invflags & IPT_INV_PROTO);
1255 if (e->ip.flags & IPT_F_FRAG)
1257 e->ip.invflags & IPT_INV_FRAG ? "! " : "");
1259 /* Print matchinfo part */
1260 if (e->target_offset) {
1261 IPT_MATCH_ITERATE(e, print_match_save, &e->ip);
1264 /* print counters for iptables -R */
1266 printf("-c %llu %llu ", (unsigned long long)e->counters.pcnt, (unsigned long long)e->counters.bcnt);
1268 /* Print target name */
1269 target_name = iptc_get_target(e, h);
1270 if (target_name && (*target_name != '\0'))
1272 printf("-%c %s ", e->ip.flags & IPT_F_GOTO ? 'g' : 'j', target_name);
1274 printf("-j %s ", target_name);
1277 /* Print targinfo part */
1278 t = ipt_get_target((struct ipt_entry *)e);
1279 if (t->u.user.name[0]) {
1280 struct xtables_target *target
1281 = find_target(t->u.user.name, TRY_LOAD);
1284 fprintf(stderr, "Can't find library for target `%s'\n",
1290 target->save(&e->ip, t);
1292 /* If the target size is greater than ipt_entry_target
1293 * there is something to be saved, we just don't know
1294 * how to print it */
1295 if (t->u.target_size !=
1296 sizeof(struct ipt_entry_target)) {
1297 fprintf(stderr, "Target `%s' is missing "
1308 list_rules(const ipt_chainlabel chain, int rulenum, int counters,
1309 iptc_handle_t *handle)
1311 const char *this = NULL;
1315 counters = -1; /* iptables -c format */
1317 /* Dump out chain names first,
1318 * thereby preventing dependency conflicts */
1319 if (!rulenum) for (this = iptc_first_chain(handle);
1321 this = iptc_next_chain(handle)) {
1322 if (chain && strcmp(this, chain) != 0)
1325 if (iptc_builtin(this, *handle)) {
1326 struct ipt_counters count;
1327 printf("-P %s %s", this, iptc_get_policy(this, &count, handle));
1329 printf(" -c %llu %llu", (unsigned long long)count.pcnt, (unsigned long long)count.bcnt);
1332 printf("-N %s\n", this);
1336 for (this = iptc_first_chain(handle);
1338 this = iptc_next_chain(handle)) {
1339 const struct ipt_entry *e;
1342 if (chain && strcmp(this, chain) != 0)
1345 /* Dump out rules */
1346 e = iptc_first_rule(this, handle);
1349 if (!rulenum || num == rulenum)
1350 print_rule(e, handle, this, counters);
1351 e = iptc_next_rule(e, handle);
1360 static struct ipt_entry *
1361 generate_entry(const struct ipt_entry *fw,
1362 struct iptables_rule_match *matches,
1363 struct ipt_entry_target *target)
1366 struct iptables_rule_match *matchp;
1367 struct ipt_entry *e;
1369 size = sizeof(struct ipt_entry);
1370 for (matchp = matches; matchp; matchp = matchp->next)
1371 size += matchp->match->m->u.match_size;
1373 e = fw_malloc(size + target->u.target_size);
1375 e->target_offset = size;
1376 e->next_offset = size + target->u.target_size;
1379 for (matchp = matches; matchp; matchp = matchp->next) {
1380 memcpy(e->elems + size, matchp->match->m, matchp->match->m->u.match_size);
1381 size += matchp->match->m->u.match_size;
1383 memcpy(e->elems + size, target, target->u.target_size);
1388 static void clear_rule_matches(struct iptables_rule_match **matches)
1390 struct iptables_rule_match *matchp, *tmp;
1392 for (matchp = *matches; matchp;) {
1394 if (matchp->match->m) {
1395 free(matchp->match->m);
1396 matchp->match->m = NULL;
1398 if (matchp->match == matchp->match->next) {
1399 free(matchp->match);
1400 matchp->match = NULL;
1409 static void set_revision(char *name, u_int8_t revision)
1411 /* Old kernel sources don't have ".revision" field,
1412 but we stole a byte from name. */
1413 name[IPT_FUNCTION_MAXNAMELEN - 2] = '\0';
1414 name[IPT_FUNCTION_MAXNAMELEN - 1] = revision;
1418 get_kernel_version(void) {
1419 static struct utsname uts;
1420 int x = 0, y = 0, z = 0;
1422 if (uname(&uts) == -1) {
1423 fprintf(stderr, "Unable to retrieve kernel version.\n");
1428 sscanf(uts.release, "%d.%d.%d", &x, &y, &z);
1429 kernel_version = LINUX_VERSION(x, y, z);
1432 int do_command(int argc, char *argv[], char **table, iptc_handle_t *handle)
1434 struct ipt_entry fw, *e = NULL;
1436 unsigned int nsaddrs = 0, ndaddrs = 0;
1437 struct in_addr *saddrs = NULL, *daddrs = NULL;
1440 const char *chain = NULL;
1441 const char *shostnetworkmask = NULL, *dhostnetworkmask = NULL;
1442 const char *policy = NULL, *newname = NULL;
1443 unsigned int rulenum = 0, options = 0, command = 0;
1444 const char *pcnt = NULL, *bcnt = NULL;
1446 struct xtables_match *m;
1447 struct iptables_rule_match *matches = NULL;
1448 struct iptables_rule_match *matchp;
1449 struct xtables_target *target = NULL;
1450 struct xtables_target *t;
1451 const char *jumpto = "";
1452 char *protocol = NULL;
1454 unsigned long long cnt;
1456 memset(&fw, 0, sizeof(fw));
1458 /* re-set optind to 0 in case do_command gets called
1462 /* clear mflags in case do_command gets called a second time
1463 * (we clear the global list of all matches for security)*/
1464 for (m = xtables_matches; m; m = m->next)
1467 for (t = xtables_targets; t; t = t->next) {
1472 /* Suppress error messages: we may add new options if we
1473 demand-load a protocol. */
1476 while ((c = getopt_long(argc, argv,
1477 "-A:D:R:I:L::S::M:F::Z::N:X::E:P:Vh::o:p:s:d:j:i:fbvnt:m:xc:g:",
1478 opts, NULL)) != -1) {
1484 add_command(&command, CMD_APPEND, CMD_NONE,
1490 add_command(&command, CMD_DELETE, CMD_NONE,
1493 if (optind < argc && argv[optind][0] != '-'
1494 && argv[optind][0] != '!') {
1495 rulenum = parse_rulenumber(argv[optind++]);
1496 command = CMD_DELETE_NUM;
1501 add_command(&command, CMD_REPLACE, CMD_NONE,
1504 if (optind < argc && argv[optind][0] != '-'
1505 && argv[optind][0] != '!')
1506 rulenum = parse_rulenumber(argv[optind++]);
1508 exit_error(PARAMETER_PROBLEM,
1509 "-%c requires a rule number",
1510 cmd2char(CMD_REPLACE));
1514 add_command(&command, CMD_INSERT, CMD_NONE,
1517 if (optind < argc && argv[optind][0] != '-'
1518 && argv[optind][0] != '!')
1519 rulenum = parse_rulenumber(argv[optind++]);
1524 add_command(&command, CMD_LIST, CMD_ZERO,
1526 if (optarg) chain = optarg;
1527 else if (optind < argc && argv[optind][0] != '-'
1528 && argv[optind][0] != '!')
1529 chain = argv[optind++];
1530 if (optind < argc && argv[optind][0] != '-'
1531 && argv[optind][0] != '!')
1532 rulenum = parse_rulenumber(argv[optind++]);
1536 add_command(&command, CMD_LIST_RULES, CMD_ZERO,
1538 if (optarg) chain = optarg;
1539 else if (optind < argc && argv[optind][0] != '-'
1540 && argv[optind][0] != '!')
1541 chain = argv[optind++];
1542 if (optind < argc && argv[optind][0] != '-'
1543 && argv[optind][0] != '!')
1544 rulenum = parse_rulenumber(argv[optind++]);
1548 add_command(&command, CMD_FLUSH, CMD_NONE,
1550 if (optarg) chain = optarg;
1551 else if (optind < argc && argv[optind][0] != '-'
1552 && argv[optind][0] != '!')
1553 chain = argv[optind++];
1557 add_command(&command, CMD_ZERO, CMD_LIST|CMD_LIST_RULES,
1559 if (optarg) chain = optarg;
1560 else if (optind < argc && argv[optind][0] != '-'
1561 && argv[optind][0] != '!')
1562 chain = argv[optind++];
1566 if (optarg && (*optarg == '-' || *optarg == '!'))
1567 exit_error(PARAMETER_PROBLEM,
1568 "chain name not allowed to start "
1569 "with `%c'\n", *optarg);
1570 if (find_target(optarg, TRY_LOAD))
1571 exit_error(PARAMETER_PROBLEM,
1572 "chain name may not clash "
1573 "with target name\n");
1574 add_command(&command, CMD_NEW_CHAIN, CMD_NONE,
1580 add_command(&command, CMD_DELETE_CHAIN, CMD_NONE,
1582 if (optarg) chain = optarg;
1583 else if (optind < argc && argv[optind][0] != '-'
1584 && argv[optind][0] != '!')
1585 chain = argv[optind++];
1589 add_command(&command, CMD_RENAME_CHAIN, CMD_NONE,
1592 if (optind < argc && argv[optind][0] != '-'
1593 && argv[optind][0] != '!')
1594 newname = argv[optind++];
1596 exit_error(PARAMETER_PROBLEM,
1597 "-%c requires old-chain-name and "
1599 cmd2char(CMD_RENAME_CHAIN));
1603 add_command(&command, CMD_SET_POLICY, CMD_NONE,
1606 if (optind < argc && argv[optind][0] != '-'
1607 && argv[optind][0] != '!')
1608 policy = argv[optind++];
1610 exit_error(PARAMETER_PROBLEM,
1611 "-%c requires a chain and a policy",
1612 cmd2char(CMD_SET_POLICY));
1617 optarg = argv[optind];
1619 /* iptables -p icmp -h */
1620 if (!matches && protocol)
1621 find_match(protocol, TRY_LOAD, &matches);
1623 exit_printhelp(matches);
1629 check_inverse(optarg, &invert, &optind, argc);
1630 set_option(&options, OPT_PROTOCOL, &fw.ip.invflags,
1633 /* Canonicalize into lower case */
1634 for (protocol = argv[optind-1]; *protocol; protocol++)
1635 *protocol = tolower(*protocol);
1637 protocol = argv[optind-1];
1638 fw.ip.proto = parse_protocol(protocol);
1640 if (fw.ip.proto == 0
1641 && (fw.ip.invflags & IPT_INV_PROTO))
1642 exit_error(PARAMETER_PROBLEM,
1643 "rule would never match protocol");
1647 check_inverse(optarg, &invert, &optind, argc);
1648 set_option(&options, OPT_SOURCE, &fw.ip.invflags,
1650 shostnetworkmask = argv[optind-1];
1654 check_inverse(optarg, &invert, &optind, argc);
1655 set_option(&options, OPT_DESTINATION, &fw.ip.invflags,
1657 dhostnetworkmask = argv[optind-1];
1662 set_option(&options, OPT_JUMP, &fw.ip.invflags,
1664 fw.ip.flags |= IPT_F_GOTO;
1665 jumpto = parse_target(optarg);
1670 set_option(&options, OPT_JUMP, &fw.ip.invflags,
1672 jumpto = parse_target(optarg);
1673 /* TRY_LOAD (may be chain name) */
1674 target = find_target(jumpto, TRY_LOAD);
1679 size = IPT_ALIGN(sizeof(struct ipt_entry_target))
1682 target->t = fw_calloc(1, size);
1683 target->t->u.target_size = size;
1684 strcpy(target->t->u.user.name, jumpto);
1685 set_revision(target->t->u.user.name,
1687 if (target->init != NULL)
1688 target->init(target->t);
1689 opts = merge_options(opts,
1691 &target->option_offset);
1693 exit_error(OTHER_PROBLEM,
1694 "can't alloc memory!");
1700 check_inverse(optarg, &invert, &optind, argc);
1701 set_option(&options, OPT_VIANAMEIN, &fw.ip.invflags,
1703 parse_interface(argv[optind-1],
1705 fw.ip.iniface_mask);
1709 check_inverse(optarg, &invert, &optind, argc);
1710 set_option(&options, OPT_VIANAMEOUT, &fw.ip.invflags,
1712 parse_interface(argv[optind-1],
1714 fw.ip.outiface_mask);
1718 set_option(&options, OPT_FRAGMENT, &fw.ip.invflags,
1720 fw.ip.flags |= IPT_F_FRAG;
1725 set_option(&options, OPT_VERBOSE,
1726 &fw.ip.invflags, invert);
1734 exit_error(PARAMETER_PROBLEM,
1735 "unexpected ! flag before --match");
1737 m = find_match(optarg, LOAD_MUST_SUCCEED, &matches);
1738 size = IPT_ALIGN(sizeof(struct ipt_entry_match))
1740 m->m = fw_calloc(1, size);
1741 m->m->u.match_size = size;
1742 strcpy(m->m->u.user.name, m->name);
1743 set_revision(m->m->u.user.name, m->revision);
1744 if (m->init != NULL)
1747 /* Merge options for non-cloned matches */
1748 opts = merge_options(opts,
1752 exit_error(OTHER_PROBLEM,
1753 "can't alloc memory!");
1759 set_option(&options, OPT_NUMERIC, &fw.ip.invflags,
1765 exit_error(PARAMETER_PROBLEM,
1766 "unexpected ! flag before --table");
1767 *table = argv[optind-1];
1771 set_option(&options, OPT_EXPANDED, &fw.ip.invflags,
1777 printf("Not %s ;-)\n", program_version);
1780 program_name, program_version);
1784 set_option(&options, OPT_LINENUMBERS, &fw.ip.invflags,
1789 modprobe_program = optarg;
1794 set_option(&options, OPT_COUNTERS, &fw.ip.invflags,
1797 bcnt = strchr(pcnt + 1, ',');
1800 if (!bcnt && optind < argc && argv[optind][0] != '-'
1801 && argv[optind][0] != '!')
1802 bcnt = argv[optind++];
1804 exit_error(PARAMETER_PROBLEM,
1805 "-%c requires packet and byte counter",
1806 opt2char(OPT_COUNTERS));
1808 if (sscanf(pcnt, "%llu", &cnt) != 1)
1809 exit_error(PARAMETER_PROBLEM,
1810 "-%c packet counter not numeric",
1811 opt2char(OPT_COUNTERS));
1812 fw.counters.pcnt = cnt;
1814 if (sscanf(bcnt, "%llu", &cnt) != 1)
1815 exit_error(PARAMETER_PROBLEM,
1816 "-%c byte counter not numeric",
1817 opt2char(OPT_COUNTERS));
1818 fw.counters.bcnt = cnt;
1822 case 1: /* non option */
1823 if (optarg[0] == '!' && optarg[1] == '\0') {
1825 exit_error(PARAMETER_PROBLEM,
1826 "multiple consecutive ! not"
1832 fprintf(stderr, "Bad argument `%s'\n", optarg);
1837 || !(target->parse(c - target->option_offset,
1840 &fw, &target->t))) {
1841 for (matchp = matches; matchp; matchp = matchp->next) {
1842 if (matchp->completed)
1844 if (matchp->match->parse(c - matchp->match->option_offset,
1846 &matchp->match->mflags,
1851 m = matchp ? matchp->match : NULL;
1853 /* If you listen carefully, you can
1854 actually hear this code suck. */
1856 /* some explanations (after four different bugs
1857 * in 3 different releases): If we encounter a
1858 * parameter, that has not been parsed yet,
1859 * it's not an option of an explicitly loaded
1860 * match or a target. However, we support
1861 * implicit loading of the protocol match
1862 * extension. '-p tcp' means 'l4 proto 6' and
1863 * at the same time 'load tcp protocol match on
1864 * demand if we specify --dport'.
1866 * To make this work, we need to make sure:
1867 * - the parameter has not been parsed by
1869 * - a protocol has been specified
1870 * - the protocol extension has not been
1871 * loaded yet, or is loaded and unused
1872 * [think of iptables-restore!]
1873 * - the protocol extension can be successively
1878 && (!find_proto(protocol, DONT_LOAD,
1879 options&OPT_NUMERIC, NULL)
1880 || (find_proto(protocol, DONT_LOAD,
1881 options&OPT_NUMERIC, NULL)
1882 && (proto_used == 0))
1884 && (m = find_proto(protocol, TRY_LOAD,
1885 options&OPT_NUMERIC, &matches))) {
1886 /* Try loading protocol */
1891 size = IPT_ALIGN(sizeof(struct ipt_entry_match))
1894 m->m = fw_calloc(1, size);
1895 m->m->u.match_size = size;
1896 strcpy(m->m->u.user.name, m->name);
1897 set_revision(m->m->u.user.name,
1899 if (m->init != NULL)
1902 opts = merge_options(opts,
1906 exit_error(OTHER_PROBLEM,
1907 "can't alloc memory!");
1913 exit_error(PARAMETER_PROBLEM,
1921 for (matchp = matches; matchp; matchp = matchp->next)
1922 if (matchp->match->final_check != NULL)
1923 matchp->match->final_check(matchp->match->mflags);
1925 if (target != NULL && target->final_check != NULL)
1926 target->final_check(target->tflags);
1928 /* Fix me: must put inverse options checking here --MN */
1931 exit_error(PARAMETER_PROBLEM,
1932 "unknown arguments found on commandline");
1934 exit_error(PARAMETER_PROBLEM, "no command specified");
1936 exit_error(PARAMETER_PROBLEM,
1937 "nothing appropriate following !");
1939 if (command & (CMD_REPLACE | CMD_INSERT | CMD_DELETE | CMD_APPEND)) {
1940 if (!(options & OPT_DESTINATION))
1941 dhostnetworkmask = "0.0.0.0/0";
1942 if (!(options & OPT_SOURCE))
1943 shostnetworkmask = "0.0.0.0/0";
1946 if (shostnetworkmask)
1947 ipparse_hostnetworkmask(shostnetworkmask, &saddrs,
1948 &fw.ip.smsk, &nsaddrs);
1950 if (dhostnetworkmask)
1951 ipparse_hostnetworkmask(dhostnetworkmask, &daddrs,
1952 &fw.ip.dmsk, &ndaddrs);
1954 if ((nsaddrs > 1 || ndaddrs > 1) &&
1955 (fw.ip.invflags & (IPT_INV_SRCIP | IPT_INV_DSTIP)))
1956 exit_error(PARAMETER_PROBLEM, "! not allowed with multiple"
1957 " source or destination IP addresses");
1959 if (command == CMD_REPLACE && (nsaddrs != 1 || ndaddrs != 1))
1960 exit_error(PARAMETER_PROBLEM, "Replacement rule does not "
1961 "specify a unique address");
1963 generic_opt_check(command, options);
1965 if (chain && strlen(chain) > IPT_FUNCTION_MAXNAMELEN)
1966 exit_error(PARAMETER_PROBLEM,
1967 "chain name `%s' too long (must be under %i chars)",
1968 chain, IPT_FUNCTION_MAXNAMELEN);
1970 /* only allocate handle if we weren't called with a handle */
1972 *handle = iptc_init(*table);
1974 /* try to insmod the module if iptc_init failed */
1975 if (!*handle && load_xtables_ko(modprobe_program, 0) != -1)
1976 *handle = iptc_init(*table);
1979 exit_error(VERSION_PROBLEM,
1980 "can't initialize iptables table `%s': %s",
1981 *table, iptc_strerror(errno));
1983 if (command == CMD_APPEND
1984 || command == CMD_DELETE
1985 || command == CMD_INSERT
1986 || command == CMD_REPLACE) {
1987 if (strcmp(chain, "PREROUTING") == 0
1988 || strcmp(chain, "INPUT") == 0) {
1989 /* -o not valid with incoming packets. */
1990 if (options & OPT_VIANAMEOUT)
1991 exit_error(PARAMETER_PROBLEM,
1992 "Can't use -%c with %s\n",
1993 opt2char(OPT_VIANAMEOUT),
1997 if (strcmp(chain, "POSTROUTING") == 0
1998 || strcmp(chain, "OUTPUT") == 0) {
1999 /* -i not valid with outgoing packets */
2000 if (options & OPT_VIANAMEIN)
2001 exit_error(PARAMETER_PROBLEM,
2002 "Can't use -%c with %s\n",
2003 opt2char(OPT_VIANAMEIN),
2007 if (target && iptc_is_chain(jumpto, *handle)) {
2009 "Warning: using chain %s, not extension\n",
2018 /* If they didn't specify a target, or it's a chain
2019 name, use standard. */
2021 && (strlen(jumpto) == 0
2022 || iptc_is_chain(jumpto, *handle))) {
2025 target = find_target(IPT_STANDARD_TARGET,
2028 size = sizeof(struct ipt_entry_target)
2030 target->t = fw_calloc(1, size);
2031 target->t->u.target_size = size;
2032 strcpy(target->t->u.user.name, jumpto);
2033 if (!iptc_is_chain(jumpto, *handle))
2034 set_revision(target->t->u.user.name,
2036 if (target->init != NULL)
2037 target->init(target->t);
2041 /* it is no chain, and we can't load a plugin.
2042 * We cannot know if the plugin is corrupt, non
2043 * existant OR if the user just misspelled a
2046 if (fw.ip.flags & IPT_F_GOTO)
2047 exit_error(PARAMETER_PROBLEM,
2048 "goto '%s' is not a chain\n", jumpto);
2050 find_target(jumpto, LOAD_MUST_SUCCEED);
2052 e = generate_entry(&fw, matches, target->t);
2059 ret = append_entry(chain, e,
2060 nsaddrs, saddrs, ndaddrs, daddrs,
2061 options&OPT_VERBOSE,
2065 ret = delete_entry(chain, e,
2066 nsaddrs, saddrs, ndaddrs, daddrs,
2067 options&OPT_VERBOSE,
2070 case CMD_DELETE_NUM:
2071 ret = iptc_delete_num_entry(chain, rulenum - 1, handle);
2074 ret = replace_entry(chain, e, rulenum - 1,
2075 saddrs, daddrs, options&OPT_VERBOSE,
2079 ret = insert_entry(chain, e, rulenum - 1,
2080 nsaddrs, saddrs, ndaddrs, daddrs,
2081 options&OPT_VERBOSE,
2085 ret = flush_entries(chain, options&OPT_VERBOSE, handle);
2088 ret = zero_entries(chain, options&OPT_VERBOSE, handle);
2091 case CMD_LIST|CMD_ZERO:
2092 ret = list_entries(chain,
2094 options&OPT_VERBOSE,
2095 options&OPT_NUMERIC,
2096 options&OPT_EXPANDED,
2097 options&OPT_LINENUMBERS,
2099 if (ret && (command & CMD_ZERO))
2100 ret = zero_entries(chain,
2101 options&OPT_VERBOSE, handle);
2103 case CMD_LIST_RULES:
2104 case CMD_LIST_RULES|CMD_ZERO:
2105 ret = list_rules(chain,
2107 options&OPT_VERBOSE,
2109 if (ret && (command & CMD_ZERO))
2110 ret = zero_entries(chain,
2111 options&OPT_VERBOSE, handle);
2114 ret = iptc_create_chain(chain, handle);
2116 case CMD_DELETE_CHAIN:
2117 ret = delete_chain(chain, options&OPT_VERBOSE, handle);
2119 case CMD_RENAME_CHAIN:
2120 ret = iptc_rename_chain(chain, newname, handle);
2122 case CMD_SET_POLICY:
2123 ret = iptc_set_policy(chain, policy, options&OPT_COUNTERS ? &fw.counters : NULL, handle);
2126 /* We should never reach this... */
2131 dump_entries(*handle);
2133 clear_rule_matches(&matches);