1 /* Code to take an ip6tables-style command line and do it. */
2
3 /*
4 * Author: Paul.Russell@rustcorp.com.au and mneuling@radlogic.com.au
5 *
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>
12 *
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.
17 *
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.
22 *
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.
26 */
27 #include "config.h"
28 #include <getopt.h>
29 #include <string.h>
30 #include <netdb.h>
31 #include <errno.h>
32 #include <stdio.h>
33 #include <stdlib.h>
34 #include <ctype.h>
35 #include <stdarg.h>
36 #include <stdbool.h>
37 #include <limits.h>
38 #include <ip6tables.h>
39 #include <xtables.h>
40 #include <arpa/inet.h>
41 #include <unistd.h>
42 #include <fcntl.h>
43 #include <sys/types.h>
44 #include <sys/socket.h>
45 #include "ip6tables-multi.h"
46 #include "xshared.h"
47
48 static const char unsupported_rev[] = " [unsupported revision]";
49
50 static struct option original_opts[] = {
51 {.name = "append", .has_arg = 1, .val = 'A'},
52 {.name = "delete", .has_arg = 1, .val = 'D'},
53 {.name = "check" , .has_arg = 1, .val = 'C'},
54 {.name = "insert", .has_arg = 1, .val = 'I'},
55 {.name = "replace", .has_arg = 1, .val = 'R'},
56 {.name = "list", .has_arg = 2, .val = 'L'},
57 {.name = "list-rules", .has_arg = 2, .val = 'S'},
58 {.name = "flush", .has_arg = 2, .val = 'F'},
59 {.name = "zero", .has_arg = 2, .val = 'Z'},
60 {.name = "new-chain", .has_arg = 1, .val = 'N'},
61 {.name = "delete-chain", .has_arg = 2, .val = 'X'},
62 {.name = "rename-chain", .has_arg = 1, .val = 'E'},
63 {.name = "policy", .has_arg = 1, .val = 'P'},
64 {.name = "source", .has_arg = 1, .val = 's'},
65 {.name = "destination", .has_arg = 1, .val = 'd'},
66 {.name = "src", .has_arg = 1, .val = 's'}, /* synonym */
67 {.name = "dst", .has_arg = 1, .val = 'd'}, /* synonym */
68 {.name = "protocol", .has_arg = 1, .val = 'p'},
69 {.name = "in-interface", .has_arg = 1, .val = 'i'},
70 {.name = "jump", .has_arg = 1, .val = 'j'},
71 {.name = "table", .has_arg = 1, .val = 't'},
72 {.name = "match", .has_arg = 1, .val = 'm'},
73 {.name = "numeric", .has_arg = 0, .val = 'n'},
74 {.name = "out-interface", .has_arg = 1, .val = 'o'},
75 {.name = "verbose", .has_arg = 0, .val = 'v'},
76 {.name = "wait", .has_arg = 2, .val = 'w'},
77 {.name = "wait-interval", .has_arg = 2, .val = 'W'},
78 {.name = "exact", .has_arg = 0, .val = 'x'},
79 {.name = "version", .has_arg = 0, .val = 'V'},
80 {.name = "help", .has_arg = 2, .val = 'h'},
81 {.name = "line-numbers", .has_arg = 0, .val = '0'},
82 {.name = "modprobe", .has_arg = 1, .val = 'M'},
83 {.name = "set-counters", .has_arg = 1, .val = 'c'},
84 {.name = "goto", .has_arg = 1, .val = 'g'},
85 {.name = "ipv4", .has_arg = 0, .val = '4'},
86 {.name = "ipv6", .has_arg = 0, .val = '6'},
87 {NULL},
88 };
89
90 void ip6tables_exit_error(enum xtables_exittype status, const char *msg, ...) __attribute__((noreturn, format(printf,2,3)));
91 struct xtables_globals ip6tables_globals = {
92 .option_offset = 0,
93 .program_version = PACKAGE_VERSION,
94 .orig_opts = original_opts,
95 .exit_err = ip6tables_exit_error,
96 .compat_rev = xtables_compatible_revision,
97 };
98
99 static const unsigned int inverse_for_options[NUMBER_OF_OPT] =
100 {
101 /* -n */ 0,
102 /* -s */ IP6T_INV_SRCIP,
103 /* -d */ IP6T_INV_DSTIP,
104 /* -p */ XT_INV_PROTO,
105 /* -j */ 0,
106 /* -v */ 0,
107 /* -x */ 0,
108 /* -i */ IP6T_INV_VIA_IN,
109 /* -o */ IP6T_INV_VIA_OUT,
110 /*--line*/ 0,
111 /* -c */ 0,
112 };
113
114 #define opts ip6tables_globals.opts
115 #define prog_name ip6tables_globals.program_name
116 #define prog_vers ip6tables_globals.program_version
117
118 static void __attribute__((noreturn))
exit_tryhelp(int status)119 exit_tryhelp(int status)
120 {
121 if (line != -1)
122 fprintf(stderr, "Error occurred at line: %d\n", line);
123 fprintf(stderr, "Try `%s -h' or '%s --help' for more information.\n",
124 prog_name, prog_name);
125 xtables_free_opts(1);
126 exit(status);
127 }
128
129 static void
exit_printhelp(const struct xtables_rule_match * matches)130 exit_printhelp(const struct xtables_rule_match *matches)
131 {
132 printf("%s v%s\n\n"
133 "Usage: %s -[ACD] chain rule-specification [options]\n"
134 " %s -I chain [rulenum] rule-specification [options]\n"
135 " %s -R chain rulenum rule-specification [options]\n"
136 " %s -D chain rulenum [options]\n"
137 " %s -[LS] [chain [rulenum]] [options]\n"
138 " %s -[FZ] [chain] [options]\n"
139 " %s -[NX] chain\n"
140 " %s -E old-chain-name new-chain-name\n"
141 " %s -P chain target [options]\n"
142 " %s -h (print this help information)\n\n",
143 prog_name, prog_vers, prog_name, prog_name,
144 prog_name, prog_name, prog_name, prog_name,
145 prog_name, prog_name, prog_name, prog_name);
146
147 printf(
148 "Commands:\n"
149 "Either long or short options are allowed.\n"
150 " --append -A chain Append to chain\n"
151 " --check -C chain Check for the existence of a rule\n"
152 " --delete -D chain Delete matching rule from chain\n"
153 " --delete -D chain rulenum\n"
154 " Delete rule rulenum (1 = first) from chain\n"
155 " --insert -I chain [rulenum]\n"
156 " Insert in chain as rulenum (default 1=first)\n"
157 " --replace -R chain rulenum\n"
158 " Replace rule rulenum (1 = first) in chain\n"
159 " --list -L [chain [rulenum]]\n"
160 " List the rules in a chain or all chains\n"
161 " --list-rules -S [chain [rulenum]]\n"
162 " Print the rules in a chain or all chains\n"
163 " --flush -F [chain] Delete all rules in chain or all chains\n"
164 " --zero -Z [chain [rulenum]]\n"
165 " Zero counters in chain or all chains\n"
166 " --new -N chain Create a new user-defined chain\n"
167 " --delete-chain\n"
168 " -X [chain] Delete a user-defined chain\n"
169 " --policy -P chain target\n"
170 " Change policy on chain to target\n"
171 " --rename-chain\n"
172 " -E old-chain new-chain\n"
173 " Change chain name, (moving any references)\n"
174
175 "Options:\n"
176 " --ipv4 -4 Error (line is ignored by ip6tables-restore)\n"
177 " --ipv6 -6 Nothing (line is ignored by iptables-restore)\n"
178 "[!] --protocol -p proto protocol: by number or name, eg. `tcp'\n"
179 "[!] --source -s address[/mask][,...]\n"
180 " source specification\n"
181 "[!] --destination -d address[/mask][,...]\n"
182 " destination specification\n"
183 "[!] --in-interface -i input name[+]\n"
184 " network interface name ([+] for wildcard)\n"
185 " --jump -j target\n"
186 " target for rule (may load target extension)\n"
187 #ifdef IP6T_F_GOTO
188 " --goto -g chain\n"
189 " jump to chain with no return\n"
190 #endif
191 " --match -m match\n"
192 " extended match (may load extension)\n"
193 " --numeric -n numeric output of addresses and ports\n"
194 "[!] --out-interface -o output name[+]\n"
195 " network interface name ([+] for wildcard)\n"
196 " --table -t table table to manipulate (default: `filter')\n"
197 " --verbose -v verbose mode\n"
198 " --wait -w [seconds] maximum wait to acquire xtables lock before give up\n"
199 " --wait-interval -W [usecs] wait time to try to acquire xtables lock\n"
200 " interval to wait for xtables lock\n"
201 " default is 1 second\n"
202 " --line-numbers print line numbers when listing\n"
203 " --exact -x expand numbers (display exact values)\n"
204 /*"[!] --fragment -f match second or further fragments only\n"*/
205 " --modprobe=<command> try to insert modules using this command\n"
206 " --set-counters PKTS BYTES set the counter during insert/append\n"
207 "[!] --version -V print package version.\n");
208
209 print_extension_helps(xtables_targets, matches);
210 exit(0);
211 }
212
213 void
ip6tables_exit_error(enum xtables_exittype status,const char * msg,...)214 ip6tables_exit_error(enum xtables_exittype status, const char *msg, ...)
215 {
216 va_list args;
217
218 va_start(args, msg);
219 fprintf(stderr, "%s v%s (legacy): ", prog_name, prog_vers);
220 vfprintf(stderr, msg, args);
221 va_end(args);
222 fprintf(stderr, "\n");
223 if (status == PARAMETER_PROBLEM)
224 exit_tryhelp(status);
225 if (status == VERSION_PROBLEM)
226 fprintf(stderr,
227 "Perhaps ip6tables or your kernel needs to be upgraded.\n");
228 /* On error paths, make sure that we don't leak memory */
229 xtables_free_opts(1);
230 exit(status);
231 }
232
233 /*
234 * All functions starting with "parse" should succeed, otherwise
235 * the program fails.
236 * Most routines return pointers to static data that may change
237 * between calls to the same or other routines with a few exceptions:
238 * "host_to_addr", "parse_hostnetwork", and "parse_hostnetworkmask"
239 * return global static data.
240 */
241
242 /* These are invalid numbers as upper layer protocol */
is_exthdr(uint16_t proto)243 static int is_exthdr(uint16_t proto)
244 {
245 return (proto == IPPROTO_ROUTING ||
246 proto == IPPROTO_FRAGMENT ||
247 proto == IPPROTO_AH ||
248 proto == IPPROTO_DSTOPTS);
249 }
250
251 static void
parse_chain(const char * chainname)252 parse_chain(const char *chainname)
253 {
254 const char *ptr;
255
256 if (strlen(chainname) >= XT_EXTENSION_MAXNAMELEN)
257 xtables_error(PARAMETER_PROBLEM,
258 "chain name `%s' too long (must be under %u chars)",
259 chainname, XT_EXTENSION_MAXNAMELEN);
260
261 if (*chainname == '-' || *chainname == '!')
262 xtables_error(PARAMETER_PROBLEM,
263 "chain name not allowed to start "
264 "with `%c'\n", *chainname);
265
266 if (xtables_find_target(chainname, XTF_TRY_LOAD))
267 xtables_error(PARAMETER_PROBLEM,
268 "chain name may not clash "
269 "with target name\n");
270
271 for (ptr = chainname; *ptr; ptr++)
272 if (isspace(*ptr))
273 xtables_error(PARAMETER_PROBLEM,
274 "Invalid chain name `%s'", chainname);
275 }
276
277 static void
set_option(unsigned int * options,unsigned int option,uint8_t * invflg,int invert)278 set_option(unsigned int *options, unsigned int option, uint8_t *invflg,
279 int invert)
280 {
281 if (*options & option)
282 xtables_error(PARAMETER_PROBLEM, "multiple -%c flags not allowed",
283 opt2char(option));
284 *options |= option;
285
286 if (invert) {
287 unsigned int i;
288 for (i = 0; 1 << i != option; i++);
289
290 if (!inverse_for_options[i])
291 xtables_error(PARAMETER_PROBLEM,
292 "cannot have ! before -%c",
293 opt2char(option));
294 *invflg |= inverse_for_options[i];
295 }
296 }
297
298
299 static void
print_header(unsigned int format,const char * chain,struct xtc_handle * handle)300 print_header(unsigned int format, const char *chain, struct xtc_handle *handle)
301 {
302 struct xt_counters counters;
303 const char *pol = ip6tc_get_policy(chain, &counters, handle);
304 printf("Chain %s", chain);
305 if (pol) {
306 printf(" (policy %s", pol);
307 if (!(format & FMT_NOCOUNTS)) {
308 fputc(' ', stdout);
309 xtables_print_num(counters.pcnt, (format|FMT_NOTABLE));
310 fputs("packets, ", stdout);
311 xtables_print_num(counters.bcnt, (format|FMT_NOTABLE));
312 fputs("bytes", stdout);
313 }
314 printf(")\n");
315 } else {
316 unsigned int refs;
317 if (!ip6tc_get_references(&refs, chain, handle))
318 printf(" (ERROR obtaining refs)\n");
319 else
320 printf(" (%u references)\n", refs);
321 }
322
323 if (format & FMT_LINENUMBERS)
324 printf(FMT("%-4s ", "%s "), "num");
325 if (!(format & FMT_NOCOUNTS)) {
326 if (format & FMT_KILOMEGAGIGA) {
327 printf(FMT("%5s ","%s "), "pkts");
328 printf(FMT("%5s ","%s "), "bytes");
329 } else {
330 printf(FMT("%8s ","%s "), "pkts");
331 printf(FMT("%10s ","%s "), "bytes");
332 }
333 }
334 if (!(format & FMT_NOTARGET))
335 printf(FMT("%-9s ","%s "), "target");
336 fputs(" prot ", stdout);
337 if (format & FMT_OPTIONS)
338 fputs("opt", stdout);
339 if (format & FMT_VIA) {
340 printf(FMT(" %-6s ","%s "), "in");
341 printf(FMT("%-6s ","%s "), "out");
342 }
343 printf(FMT(" %-19s ","%s "), "source");
344 printf(FMT(" %-19s "," %s "), "destination");
345 printf("\n");
346 }
347
348
349 static int
print_match(const struct xt_entry_match * m,const struct ip6t_ip6 * ip,int numeric)350 print_match(const struct xt_entry_match *m,
351 const struct ip6t_ip6 *ip,
352 int numeric)
353 {
354 const char *name = m->u.user.name;
355 const int revision = m->u.user.revision;
356 struct xtables_match *match, *mt;
357
358 match = xtables_find_match(name, XTF_TRY_LOAD, NULL);
359 if (match) {
360 mt = xtables_find_match_revision(name, XTF_TRY_LOAD,
361 match, revision);
362 if (mt && mt->print)
363 mt->print(ip, m, numeric);
364 else if (match->print)
365 printf("%s%s ", match->name, unsupported_rev);
366 else
367 printf("%s ", match->name);
368 } else {
369 if (name[0])
370 printf("UNKNOWN match `%s' ", name);
371 }
372 /* Don't stop iterating. */
373 return 0;
374 }
375
376 /* e is called `fw' here for historical reasons */
377 static void
print_firewall(const struct ip6t_entry * fw,const char * targname,unsigned int num,unsigned int format,struct xtc_handle * const handle)378 print_firewall(const struct ip6t_entry *fw,
379 const char *targname,
380 unsigned int num,
381 unsigned int format,
382 struct xtc_handle *const handle)
383 {
384 struct xtables_target *target, *tg;
385 const struct xt_entry_target *t;
386
387 if (!ip6tc_is_chain(targname, handle))
388 target = xtables_find_target(targname, XTF_TRY_LOAD);
389 else
390 target = xtables_find_target(XT_STANDARD_TARGET,
391 XTF_LOAD_MUST_SUCCEED);
392
393 t = ip6t_get_target((struct ip6t_entry *)fw);
394
395 if (format & FMT_LINENUMBERS)
396 printf(FMT("%-4u ", "%u "), num);
397
398 if (!(format & FMT_NOCOUNTS)) {
399 xtables_print_num(fw->counters.pcnt, format);
400 xtables_print_num(fw->counters.bcnt, format);
401 }
402
403 if (!(format & FMT_NOTARGET))
404 printf(FMT("%-9s ", "%s "), targname);
405
406 fputc(fw->ipv6.invflags & XT_INV_PROTO ? '!' : ' ', stdout);
407 {
408 const char *pname = proto_to_name(fw->ipv6.proto, format&FMT_NUMERIC);
409 if (pname)
410 printf(FMT("%-5s", "%s "), pname);
411 else
412 printf(FMT("%-5hu", "%hu "), fw->ipv6.proto);
413 }
414
415 if (format & FMT_OPTIONS) {
416 if (format & FMT_NOTABLE)
417 fputs("opt ", stdout);
418 fputc(' ', stdout); /* Invert flag of FRAG */
419 fputc(' ', stdout); /* -f */
420 fputc(' ', stdout);
421 }
422
423 print_ifaces(fw->ipv6.iniface, fw->ipv6.outiface,
424 fw->ipv6.invflags, format);
425
426 print_ipv6_addresses(fw, format);
427
428 if (format & FMT_NOTABLE)
429 fputs(" ", stdout);
430
431 #ifdef IP6T_F_GOTO
432 if(fw->ipv6.flags & IP6T_F_GOTO)
433 printf("[goto] ");
434 #endif
435
436 IP6T_MATCH_ITERATE(fw, print_match, &fw->ipv6, format & FMT_NUMERIC);
437
438 if (target) {
439 const int revision = t->u.user.revision;
440
441 tg = xtables_find_target_revision(targname, XTF_TRY_LOAD,
442 target, revision);
443 if (tg && tg->print)
444 /* Print the target information. */
445 tg->print(&fw->ipv6, t, format & FMT_NUMERIC);
446 else if (target->print)
447 printf(" %s%s", target->name, unsupported_rev);
448 } else if (t->u.target_size != sizeof(*t))
449 printf("[%u bytes of unknown target data] ",
450 (unsigned int)(t->u.target_size - sizeof(*t)));
451
452 if (!(format & FMT_NONEWLINE))
453 fputc('\n', stdout);
454 }
455
456 static void
print_firewall_line(const struct ip6t_entry * fw,struct xtc_handle * const h)457 print_firewall_line(const struct ip6t_entry *fw,
458 struct xtc_handle *const h)
459 {
460 struct xt_entry_target *t;
461
462 t = ip6t_get_target((struct ip6t_entry *)fw);
463 print_firewall(fw, t->u.user.name, 0, FMT_PRINT_RULE, h);
464 }
465
466 static int
append_entry(const xt_chainlabel chain,struct ip6t_entry * fw,unsigned int nsaddrs,const struct in6_addr saddrs[],const struct in6_addr smasks[],unsigned int ndaddrs,const struct in6_addr daddrs[],const struct in6_addr dmasks[],int verbose,struct xtc_handle * handle)467 append_entry(const xt_chainlabel chain,
468 struct ip6t_entry *fw,
469 unsigned int nsaddrs,
470 const struct in6_addr saddrs[],
471 const struct in6_addr smasks[],
472 unsigned int ndaddrs,
473 const struct in6_addr daddrs[],
474 const struct in6_addr dmasks[],
475 int verbose,
476 struct xtc_handle *handle)
477 {
478 unsigned int i, j;
479 int ret = 1;
480
481 for (i = 0; i < nsaddrs; i++) {
482 fw->ipv6.src = saddrs[i];
483 fw->ipv6.smsk = smasks[i];
484 for (j = 0; j < ndaddrs; j++) {
485 fw->ipv6.dst = daddrs[j];
486 fw->ipv6.dmsk = dmasks[j];
487 if (verbose)
488 print_firewall_line(fw, handle);
489 ret &= ip6tc_append_entry(chain, fw, handle);
490 }
491 }
492
493 return ret;
494 }
495
496 static int
replace_entry(const xt_chainlabel chain,struct ip6t_entry * fw,unsigned int rulenum,const struct in6_addr * saddr,const struct in6_addr * smask,const struct in6_addr * daddr,const struct in6_addr * dmask,int verbose,struct xtc_handle * handle)497 replace_entry(const xt_chainlabel chain,
498 struct ip6t_entry *fw,
499 unsigned int rulenum,
500 const struct in6_addr *saddr, const struct in6_addr *smask,
501 const struct in6_addr *daddr, const struct in6_addr *dmask,
502 int verbose,
503 struct xtc_handle *handle)
504 {
505 fw->ipv6.src = *saddr;
506 fw->ipv6.dst = *daddr;
507 fw->ipv6.smsk = *smask;
508 fw->ipv6.dmsk = *dmask;
509
510 if (verbose)
511 print_firewall_line(fw, handle);
512 return ip6tc_replace_entry(chain, fw, rulenum, handle);
513 }
514
515 static int
insert_entry(const xt_chainlabel chain,struct ip6t_entry * fw,unsigned int rulenum,unsigned int nsaddrs,const struct in6_addr saddrs[],const struct in6_addr smasks[],unsigned int ndaddrs,const struct in6_addr daddrs[],const struct in6_addr dmasks[],int verbose,struct xtc_handle * handle)516 insert_entry(const xt_chainlabel chain,
517 struct ip6t_entry *fw,
518 unsigned int rulenum,
519 unsigned int nsaddrs,
520 const struct in6_addr saddrs[],
521 const struct in6_addr smasks[],
522 unsigned int ndaddrs,
523 const struct in6_addr daddrs[],
524 const struct in6_addr dmasks[],
525 int verbose,
526 struct xtc_handle *handle)
527 {
528 unsigned int i, j;
529 int ret = 1;
530
531 for (i = 0; i < nsaddrs; i++) {
532 fw->ipv6.src = saddrs[i];
533 fw->ipv6.smsk = smasks[i];
534 for (j = 0; j < ndaddrs; j++) {
535 fw->ipv6.dst = daddrs[j];
536 fw->ipv6.dmsk = dmasks[j];
537 if (verbose)
538 print_firewall_line(fw, handle);
539 ret &= ip6tc_insert_entry(chain, fw, rulenum, handle);
540 }
541 }
542
543 return ret;
544 }
545
546 static unsigned char *
make_delete_mask(const struct xtables_rule_match * matches,const struct xtables_target * target)547 make_delete_mask(const struct xtables_rule_match *matches,
548 const struct xtables_target *target)
549 {
550 /* Establish mask for comparison */
551 unsigned int size;
552 const struct xtables_rule_match *matchp;
553 unsigned char *mask, *mptr;
554
555 size = sizeof(struct ip6t_entry);
556 for (matchp = matches; matchp; matchp = matchp->next)
557 size += XT_ALIGN(sizeof(struct xt_entry_match)) + matchp->match->size;
558
559 mask = xtables_calloc(1, size
560 + XT_ALIGN(sizeof(struct xt_entry_target))
561 + target->size);
562
563 memset(mask, 0xFF, sizeof(struct ip6t_entry));
564 mptr = mask + sizeof(struct ip6t_entry);
565
566 for (matchp = matches; matchp; matchp = matchp->next) {
567 memset(mptr, 0xFF,
568 XT_ALIGN(sizeof(struct xt_entry_match))
569 + matchp->match->userspacesize);
570 mptr += XT_ALIGN(sizeof(struct xt_entry_match)) + matchp->match->size;
571 }
572
573 memset(mptr, 0xFF,
574 XT_ALIGN(sizeof(struct xt_entry_target))
575 + target->userspacesize);
576
577 return mask;
578 }
579
580 static int
delete_entry(const xt_chainlabel chain,struct ip6t_entry * fw,unsigned int nsaddrs,const struct in6_addr saddrs[],const struct in6_addr smasks[],unsigned int ndaddrs,const struct in6_addr daddrs[],const struct in6_addr dmasks[],int verbose,struct xtc_handle * handle,struct xtables_rule_match * matches,const struct xtables_target * target)581 delete_entry(const xt_chainlabel chain,
582 struct ip6t_entry *fw,
583 unsigned int nsaddrs,
584 const struct in6_addr saddrs[],
585 const struct in6_addr smasks[],
586 unsigned int ndaddrs,
587 const struct in6_addr daddrs[],
588 const struct in6_addr dmasks[],
589 int verbose,
590 struct xtc_handle *handle,
591 struct xtables_rule_match *matches,
592 const struct xtables_target *target)
593 {
594 unsigned int i, j;
595 int ret = 1;
596 unsigned char *mask;
597
598 mask = make_delete_mask(matches, target);
599 for (i = 0; i < nsaddrs; i++) {
600 fw->ipv6.src = saddrs[i];
601 fw->ipv6.smsk = smasks[i];
602 for (j = 0; j < ndaddrs; j++) {
603 fw->ipv6.dst = daddrs[j];
604 fw->ipv6.dmsk = dmasks[j];
605 if (verbose)
606 print_firewall_line(fw, handle);
607 ret &= ip6tc_delete_entry(chain, fw, mask, handle);
608 }
609 }
610 free(mask);
611
612 return ret;
613 }
614
615 static int
check_entry(const xt_chainlabel chain,struct ip6t_entry * fw,unsigned int nsaddrs,const struct in6_addr * saddrs,const struct in6_addr * smasks,unsigned int ndaddrs,const struct in6_addr * daddrs,const struct in6_addr * dmasks,bool verbose,struct xtc_handle * handle,struct xtables_rule_match * matches,const struct xtables_target * target)616 check_entry(const xt_chainlabel chain, struct ip6t_entry *fw,
617 unsigned int nsaddrs, const struct in6_addr *saddrs,
618 const struct in6_addr *smasks, unsigned int ndaddrs,
619 const struct in6_addr *daddrs, const struct in6_addr *dmasks,
620 bool verbose, struct xtc_handle *handle,
621 struct xtables_rule_match *matches,
622 const struct xtables_target *target)
623 {
624 unsigned int i, j;
625 int ret = 1;
626 unsigned char *mask;
627
628 mask = make_delete_mask(matches, target);
629 for (i = 0; i < nsaddrs; i++) {
630 fw->ipv6.src = saddrs[i];
631 fw->ipv6.smsk = smasks[i];
632 for (j = 0; j < ndaddrs; j++) {
633 fw->ipv6.dst = daddrs[j];
634 fw->ipv6.dmsk = dmasks[j];
635 if (verbose)
636 print_firewall_line(fw, handle);
637 ret &= ip6tc_check_entry(chain, fw, mask, handle);
638 }
639 }
640
641 free(mask);
642 return ret;
643 }
644
645 int
for_each_chain6(int (* fn)(const xt_chainlabel,int,struct xtc_handle *),int verbose,int builtinstoo,struct xtc_handle * handle)646 for_each_chain6(int (*fn)(const xt_chainlabel, int, struct xtc_handle *),
647 int verbose, int builtinstoo, struct xtc_handle *handle)
648 {
649 int ret = 1;
650 const char *chain;
651 char *chains;
652 unsigned int i, chaincount = 0;
653
654 chain = ip6tc_first_chain(handle);
655 while (chain) {
656 chaincount++;
657 chain = ip6tc_next_chain(handle);
658 }
659
660 chains = xtables_malloc(sizeof(xt_chainlabel) * chaincount);
661 i = 0;
662 chain = ip6tc_first_chain(handle);
663 while (chain) {
664 strcpy(chains + i*sizeof(xt_chainlabel), chain);
665 i++;
666 chain = ip6tc_next_chain(handle);
667 }
668
669 for (i = 0; i < chaincount; i++) {
670 if (!builtinstoo
671 && ip6tc_builtin(chains + i*sizeof(xt_chainlabel),
672 handle) == 1)
673 continue;
674 ret &= fn(chains + i*sizeof(xt_chainlabel), verbose, handle);
675 }
676
677 free(chains);
678 return ret;
679 }
680
681 int
flush_entries6(const xt_chainlabel chain,int verbose,struct xtc_handle * handle)682 flush_entries6(const xt_chainlabel chain, int verbose,
683 struct xtc_handle *handle)
684 {
685 if (!chain)
686 return for_each_chain6(flush_entries6, verbose, 1, handle);
687
688 if (verbose)
689 fprintf(stdout, "Flushing chain `%s'\n", chain);
690 return ip6tc_flush_entries(chain, handle);
691 }
692
693 static int
zero_entries(const xt_chainlabel chain,int verbose,struct xtc_handle * handle)694 zero_entries(const xt_chainlabel chain, int verbose,
695 struct xtc_handle *handle)
696 {
697 if (!chain)
698 return for_each_chain6(zero_entries, verbose, 1, handle);
699
700 if (verbose)
701 fprintf(stdout, "Zeroing chain `%s'\n", chain);
702 return ip6tc_zero_entries(chain, handle);
703 }
704
705 int
delete_chain6(const xt_chainlabel chain,int verbose,struct xtc_handle * handle)706 delete_chain6(const xt_chainlabel chain, int verbose,
707 struct xtc_handle *handle)
708 {
709 if (!chain)
710 return for_each_chain6(delete_chain6, verbose, 0, handle);
711
712 if (verbose)
713 fprintf(stdout, "Deleting chain `%s'\n", chain);
714 return ip6tc_delete_chain(chain, handle);
715 }
716
717 static int
list_entries(const xt_chainlabel chain,int rulenum,int verbose,int numeric,int expanded,int linenumbers,struct xtc_handle * handle)718 list_entries(const xt_chainlabel chain, int rulenum, int verbose, int numeric,
719 int expanded, int linenumbers, struct xtc_handle *handle)
720 {
721 int found = 0;
722 unsigned int format;
723 const char *this;
724
725 format = FMT_OPTIONS;
726 if (!verbose)
727 format |= FMT_NOCOUNTS;
728 else
729 format |= FMT_VIA;
730
731 if (numeric)
732 format |= FMT_NUMERIC;
733
734 if (!expanded)
735 format |= FMT_KILOMEGAGIGA;
736
737 if (linenumbers)
738 format |= FMT_LINENUMBERS;
739
740 for (this = ip6tc_first_chain(handle);
741 this;
742 this = ip6tc_next_chain(handle)) {
743 const struct ip6t_entry *i;
744 unsigned int num;
745
746 if (chain && strcmp(chain, this) != 0)
747 continue;
748
749 if (found) printf("\n");
750
751 if (!rulenum)
752 print_header(format, this, handle);
753 i = ip6tc_first_rule(this, handle);
754
755 num = 0;
756 while (i) {
757 num++;
758 if (!rulenum || num == rulenum)
759 print_firewall(i,
760 ip6tc_get_target(i, handle),
761 num,
762 format,
763 handle);
764 i = ip6tc_next_rule(i, handle);
765 }
766 found = 1;
767 }
768
769 errno = ENOENT;
770 return found;
771 }
772
773 /* This assumes that mask is contiguous, and byte-bounded. */
774 static void
print_iface(char letter,const char * iface,const unsigned char * mask,int invert)775 print_iface(char letter, const char *iface, const unsigned char *mask,
776 int invert)
777 {
778 unsigned int i;
779
780 if (mask[0] == 0)
781 return;
782
783 printf("%s -%c ", invert ? " !" : "", letter);
784
785 for (i = 0; i < IFNAMSIZ; i++) {
786 if (mask[i] != 0) {
787 if (iface[i] != '\0')
788 printf("%c", iface[i]);
789 } else {
790 /* we can access iface[i-1] here, because
791 * a few lines above we make sure that mask[0] != 0 */
792 if (iface[i-1] != '\0')
793 printf("+");
794 break;
795 }
796 }
797 }
798
799 /* The ip6tables looks up the /etc/protocols. */
print_proto(uint16_t proto,int invert)800 static void print_proto(uint16_t proto, int invert)
801 {
802 if (proto) {
803 unsigned int i;
804 const char *invertstr = invert ? " !" : "";
805
806 const struct protoent *pent = getprotobynumber(proto);
807 if (pent) {
808 printf("%s -p %s",
809 invertstr, pent->p_name);
810 return;
811 }
812
813 for (i = 0; xtables_chain_protos[i].name != NULL; ++i)
814 if (xtables_chain_protos[i].num == proto) {
815 printf("%s -p %s",
816 invertstr, xtables_chain_protos[i].name);
817 return;
818 }
819
820 printf("%s -p %u", invertstr, proto);
821 }
822 }
823
print_match_save(const struct xt_entry_match * e,const struct ip6t_ip6 * ip)824 static int print_match_save(const struct xt_entry_match *e,
825 const struct ip6t_ip6 *ip)
826 {
827 const char *name = e->u.user.name;
828 const int revision = e->u.user.revision;
829 struct xtables_match *match, *mt, *mt2;
830
831 match = xtables_find_match(name, XTF_TRY_LOAD, NULL);
832 if (match) {
833 mt = mt2 = xtables_find_match_revision(name, XTF_TRY_LOAD,
834 match, revision);
835 if (!mt2)
836 mt2 = match;
837 printf(" -m %s", mt2->alias ? mt2->alias(e) : name);
838
839 /* some matches don't provide a save function */
840 if (mt && mt->save)
841 mt->save(ip, e);
842 else if (match->save)
843 printf(unsupported_rev);
844 } else {
845 if (e->u.match_size) {
846 fprintf(stderr,
847 "Can't find library for match `%s'\n",
848 name);
849 exit(1);
850 }
851 }
852 return 0;
853 }
854
855 /* Print a given ip including mask if necessary. */
print_ip(const char * prefix,const struct in6_addr * ip,const struct in6_addr * mask,int invert)856 static void print_ip(const char *prefix, const struct in6_addr *ip,
857 const struct in6_addr *mask, int invert)
858 {
859 char buf[51];
860 int l = xtables_ip6mask_to_cidr(mask);
861
862 if (l == 0 && !invert)
863 return;
864
865 printf("%s %s %s",
866 invert ? " !" : "",
867 prefix,
868 inet_ntop(AF_INET6, ip, buf, sizeof buf));
869
870 if (l == -1)
871 printf("/%s", inet_ntop(AF_INET6, mask, buf, sizeof buf));
872 else
873 printf("/%d", l);
874 }
875
876 /* We want this to be readable, so only print out necessary fields.
877 * Because that's the kind of world I want to live in.
878 */
print_rule6(const struct ip6t_entry * e,struct xtc_handle * h,const char * chain,int counters)879 void print_rule6(const struct ip6t_entry *e,
880 struct xtc_handle *h, const char *chain, int counters)
881 {
882 const struct xt_entry_target *t;
883 const char *target_name;
884
885 /* print counters for iptables-save */
886 if (counters > 0)
887 printf("[%llu:%llu] ", (unsigned long long)e->counters.pcnt, (unsigned long long)e->counters.bcnt);
888
889 /* print chain name */
890 printf("-A %s", chain);
891
892 /* Print IP part. */
893 print_ip("-s", &(e->ipv6.src), &(e->ipv6.smsk),
894 e->ipv6.invflags & IP6T_INV_SRCIP);
895
896 print_ip("-d", &(e->ipv6.dst), &(e->ipv6.dmsk),
897 e->ipv6.invflags & IP6T_INV_DSTIP);
898
899 print_iface('i', e->ipv6.iniface, e->ipv6.iniface_mask,
900 e->ipv6.invflags & IP6T_INV_VIA_IN);
901
902 print_iface('o', e->ipv6.outiface, e->ipv6.outiface_mask,
903 e->ipv6.invflags & IP6T_INV_VIA_OUT);
904
905 print_proto(e->ipv6.proto, e->ipv6.invflags & XT_INV_PROTO);
906
907 #if 0
908 /* not definied in ipv6
909 * FIXME: linux/netfilter_ipv6/ip6_tables: IP6T_INV_FRAG why definied? */
910 if (e->ipv6.flags & IPT_F_FRAG)
911 printf("%s -f",
912 e->ipv6.invflags & IP6T_INV_FRAG ? " !" : "");
913 #endif
914
915 if (e->ipv6.flags & IP6T_F_TOS)
916 printf("%s -? %d",
917 e->ipv6.invflags & IP6T_INV_TOS ? " !" : "",
918 e->ipv6.tos);
919
920 /* Print matchinfo part */
921 if (e->target_offset) {
922 IP6T_MATCH_ITERATE(e, print_match_save, &e->ipv6);
923 }
924
925 /* print counters for iptables -R */
926 if (counters < 0)
927 printf(" -c %llu %llu", (unsigned long long)e->counters.pcnt, (unsigned long long)e->counters.bcnt);
928
929 /* Print target name and targinfo part */
930 target_name = ip6tc_get_target(e, h);
931 t = ip6t_get_target((struct ip6t_entry *)e);
932 if (t->u.user.name[0]) {
933 const char *name = t->u.user.name;
934 const int revision = t->u.user.revision;
935 struct xtables_target *target, *tg, *tg2;
936
937 target = xtables_find_target(name, XTF_TRY_LOAD);
938 if (!target) {
939 fprintf(stderr, "Can't find library for target `%s'\n",
940 name);
941 exit(1);
942 }
943
944 tg = tg2 = xtables_find_target_revision(name, XTF_TRY_LOAD,
945 target, revision);
946 if (!tg2)
947 tg2 = target;
948 printf(" -j %s", tg2->alias ? tg2->alias(t) : target_name);
949
950 if (tg && tg->save)
951 tg->save(&e->ipv6, t);
952 else if (target->save)
953 printf(unsupported_rev);
954 else {
955 /* If the target size is greater than xt_entry_target
956 * there is something to be saved, we just don't know
957 * how to print it */
958 if (t->u.target_size !=
959 sizeof(struct xt_entry_target)) {
960 fprintf(stderr, "Target `%s' is missing "
961 "save function\n",
962 name);
963 exit(1);
964 }
965 }
966 } else if (target_name && (*target_name != '\0'))
967 #ifdef IP6T_F_GOTO
968 printf(" -%c %s", e->ipv6.flags & IP6T_F_GOTO ? 'g' : 'j', target_name);
969 #else
970 printf(" -j %s", target_name);
971 #endif
972
973 printf("\n");
974 }
975
976 static int
list_rules(const xt_chainlabel chain,int rulenum,int counters,struct xtc_handle * handle)977 list_rules(const xt_chainlabel chain, int rulenum, int counters,
978 struct xtc_handle *handle)
979 {
980 const char *this = NULL;
981 int found = 0;
982
983 if (counters)
984 counters = -1; /* iptables -c format */
985
986 /* Dump out chain names first,
987 * thereby preventing dependency conflicts */
988 if (!rulenum) for (this = ip6tc_first_chain(handle);
989 this;
990 this = ip6tc_next_chain(handle)) {
991 if (chain && strcmp(this, chain) != 0)
992 continue;
993
994 if (ip6tc_builtin(this, handle)) {
995 struct xt_counters count;
996 printf("-P %s %s", this, ip6tc_get_policy(this, &count, handle));
997 if (counters)
998 printf(" -c %llu %llu", (unsigned long long)count.pcnt, (unsigned long long)count.bcnt);
999 printf("\n");
1000 } else {
1001 printf("-N %s\n", this);
1002 }
1003 }
1004
1005 for (this = ip6tc_first_chain(handle);
1006 this;
1007 this = ip6tc_next_chain(handle)) {
1008 const struct ip6t_entry *e;
1009 int num = 0;
1010
1011 if (chain && strcmp(this, chain) != 0)
1012 continue;
1013
1014 /* Dump out rules */
1015 e = ip6tc_first_rule(this, handle);
1016 while(e) {
1017 num++;
1018 if (!rulenum || num == rulenum)
1019 print_rule6(e, handle, this, counters);
1020 e = ip6tc_next_rule(e, handle);
1021 }
1022 found = 1;
1023 }
1024
1025 errno = ENOENT;
1026 return found;
1027 }
1028
1029 static struct ip6t_entry *
generate_entry(const struct ip6t_entry * fw,struct xtables_rule_match * matches,struct xt_entry_target * target)1030 generate_entry(const struct ip6t_entry *fw,
1031 struct xtables_rule_match *matches,
1032 struct xt_entry_target *target)
1033 {
1034 unsigned int size;
1035 struct xtables_rule_match *matchp;
1036 struct ip6t_entry *e;
1037
1038 size = sizeof(struct ip6t_entry);
1039 for (matchp = matches; matchp; matchp = matchp->next)
1040 size += matchp->match->m->u.match_size;
1041
1042 e = xtables_malloc(size + target->u.target_size);
1043 *e = *fw;
1044 e->target_offset = size;
1045 e->next_offset = size + target->u.target_size;
1046
1047 size = 0;
1048 for (matchp = matches; matchp; matchp = matchp->next) {
1049 memcpy(e->elems + size, matchp->match->m, matchp->match->m->u.match_size);
1050 size += matchp->match->m->u.match_size;
1051 }
1052 memcpy(e->elems + size, target, target->u.target_size);
1053
1054 return e;
1055 }
1056
do_command6(int argc,char * argv[],char ** table,struct xtc_handle ** handle,bool restore)1057 int do_command6(int argc, char *argv[], char **table,
1058 struct xtc_handle **handle, bool restore)
1059 {
1060 struct iptables_command_state cs = {
1061 .jumpto = "",
1062 .argv = argv,
1063 };
1064 struct ip6t_entry *e = NULL;
1065 unsigned int nsaddrs = 0, ndaddrs = 0;
1066 struct in6_addr *saddrs = NULL, *daddrs = NULL;
1067 struct in6_addr *smasks = NULL, *dmasks = NULL;
1068
1069 int verbose = 0;
1070 int wait = 0;
1071 struct timeval wait_interval = {
1072 .tv_sec = 1,
1073 };
1074 bool wait_interval_set = false;
1075 const char *chain = NULL;
1076 const char *shostnetworkmask = NULL, *dhostnetworkmask = NULL;
1077 const char *policy = NULL, *newname = NULL;
1078 unsigned int rulenum = 0, command = 0;
1079 const char *pcnt = NULL, *bcnt = NULL;
1080 int ret = 1;
1081 struct xtables_match *m;
1082 struct xtables_rule_match *matchp;
1083 struct xtables_target *t;
1084 unsigned long long cnt;
1085 bool table_set = false;
1086
1087 /* re-set optind to 0 in case do_command6 gets called
1088 * a second time */
1089 optind = 0;
1090
1091 /* clear mflags in case do_command6 gets called a second time
1092 * (we clear the global list of all matches for security)*/
1093 for (m = xtables_matches; m; m = m->next)
1094 m->mflags = 0;
1095
1096 for (t = xtables_targets; t; t = t->next) {
1097 t->tflags = 0;
1098 t->used = 0;
1099 }
1100
1101 /* Suppress error messages: we may add new options if we
1102 demand-load a protocol. */
1103 opterr = 0;
1104
1105 opts = xt_params->orig_opts;
1106 while ((cs.c = getopt_long(argc, argv,
1107 "-:A:C:D:R:I:L::S::M:F::Z::N:X::E:P:Vh::o:p:s:d:j:i:bvw::W::nt:m:xc:g:46",
1108 opts, NULL)) != -1) {
1109 switch (cs.c) {
1110 /*
1111 * Command selection
1112 */
1113 case 'A':
1114 add_command(&command, CMD_APPEND, CMD_NONE,
1115 cs.invert);
1116 chain = optarg;
1117 break;
1118
1119 case 'C':
1120 add_command(&command, CMD_CHECK, CMD_NONE,
1121 cs.invert);
1122 chain = optarg;
1123 break;
1124
1125 case 'D':
1126 add_command(&command, CMD_DELETE, CMD_NONE,
1127 cs.invert);
1128 chain = optarg;
1129 if (xs_has_arg(argc, argv)) {
1130 rulenum = parse_rulenumber(argv[optind++]);
1131 command = CMD_DELETE_NUM;
1132 }
1133 break;
1134
1135 case 'R':
1136 add_command(&command, CMD_REPLACE, CMD_NONE,
1137 cs.invert);
1138 chain = optarg;
1139 if (xs_has_arg(argc, argv))
1140 rulenum = parse_rulenumber(argv[optind++]);
1141 else
1142 xtables_error(PARAMETER_PROBLEM,
1143 "-%c requires a rule number",
1144 cmd2char(CMD_REPLACE));
1145 break;
1146
1147 case 'I':
1148 add_command(&command, CMD_INSERT, CMD_NONE,
1149 cs.invert);
1150 chain = optarg;
1151 if (xs_has_arg(argc, argv))
1152 rulenum = parse_rulenumber(argv[optind++]);
1153 else rulenum = 1;
1154 break;
1155
1156 case 'L':
1157 add_command(&command, CMD_LIST,
1158 CMD_ZERO | CMD_ZERO_NUM, cs.invert);
1159 if (optarg) chain = optarg;
1160 else if (xs_has_arg(argc, argv))
1161 chain = argv[optind++];
1162 if (xs_has_arg(argc, argv))
1163 rulenum = parse_rulenumber(argv[optind++]);
1164 break;
1165
1166 case 'S':
1167 add_command(&command, CMD_LIST_RULES,
1168 CMD_ZERO | CMD_ZERO_NUM, cs.invert);
1169 if (optarg) chain = optarg;
1170 else if (xs_has_arg(argc, argv))
1171 chain = argv[optind++];
1172 if (xs_has_arg(argc, argv))
1173 rulenum = parse_rulenumber(argv[optind++]);
1174 break;
1175
1176 case 'F':
1177 add_command(&command, CMD_FLUSH, CMD_NONE,
1178 cs.invert);
1179 if (optarg) chain = optarg;
1180 else if (xs_has_arg(argc, argv))
1181 chain = argv[optind++];
1182 break;
1183
1184 case 'Z':
1185 add_command(&command, CMD_ZERO, CMD_LIST|CMD_LIST_RULES,
1186 cs.invert);
1187 if (optarg) chain = optarg;
1188 else if (xs_has_arg(argc, argv))
1189 chain = argv[optind++];
1190 if (xs_has_arg(argc, argv)) {
1191 rulenum = parse_rulenumber(argv[optind++]);
1192 command = CMD_ZERO_NUM;
1193 }
1194 break;
1195
1196 case 'N':
1197 parse_chain(optarg);
1198 add_command(&command, CMD_NEW_CHAIN, CMD_NONE,
1199 cs.invert);
1200 chain = optarg;
1201 break;
1202
1203 case 'X':
1204 add_command(&command, CMD_DELETE_CHAIN, CMD_NONE,
1205 cs.invert);
1206 if (optarg) chain = optarg;
1207 else if (xs_has_arg(argc, argv))
1208 chain = argv[optind++];
1209 break;
1210
1211 case 'E':
1212 add_command(&command, CMD_RENAME_CHAIN, CMD_NONE,
1213 cs.invert);
1214 chain = optarg;
1215 if (xs_has_arg(argc, argv))
1216 newname = argv[optind++];
1217 else
1218 xtables_error(PARAMETER_PROBLEM,
1219 "-%c requires old-chain-name and "
1220 "new-chain-name",
1221 cmd2char(CMD_RENAME_CHAIN));
1222 break;
1223
1224 case 'P':
1225 add_command(&command, CMD_SET_POLICY, CMD_NONE,
1226 cs.invert);
1227 chain = optarg;
1228 if (xs_has_arg(argc, argv))
1229 policy = argv[optind++];
1230 else
1231 xtables_error(PARAMETER_PROBLEM,
1232 "-%c requires a chain and a policy",
1233 cmd2char(CMD_SET_POLICY));
1234 break;
1235
1236 case 'h':
1237 if (!optarg)
1238 optarg = argv[optind];
1239
1240 /* ip6tables -p icmp -h */
1241 if (!cs.matches && cs.protocol)
1242 xtables_find_match(cs.protocol, XTF_TRY_LOAD,
1243 &cs.matches);
1244
1245 exit_printhelp(cs.matches);
1246
1247 /*
1248 * Option selection
1249 */
1250 case 'p':
1251 set_option(&cs.options, OPT_PROTOCOL, &cs.fw6.ipv6.invflags,
1252 cs.invert);
1253
1254 /* Canonicalize into lower case */
1255 for (cs.protocol = optarg; *cs.protocol; cs.protocol++)
1256 *cs.protocol = tolower(*cs.protocol);
1257
1258 cs.protocol = optarg;
1259 cs.fw6.ipv6.proto = xtables_parse_protocol(cs.protocol);
1260 cs.fw6.ipv6.flags |= IP6T_F_PROTO;
1261
1262 if (cs.fw6.ipv6.proto == 0
1263 && (cs.fw6.ipv6.invflags & XT_INV_PROTO))
1264 xtables_error(PARAMETER_PROBLEM,
1265 "rule would never match protocol");
1266
1267 if (is_exthdr(cs.fw6.ipv6.proto)
1268 && (cs.fw6.ipv6.invflags & XT_INV_PROTO) == 0)
1269 fprintf(stderr,
1270 "Warning: never matched protocol: %s. "
1271 "use extension match instead.\n",
1272 cs.protocol);
1273 break;
1274
1275 case 's':
1276 set_option(&cs.options, OPT_SOURCE, &cs.fw6.ipv6.invflags,
1277 cs.invert);
1278 shostnetworkmask = optarg;
1279 break;
1280
1281 case 'd':
1282 set_option(&cs.options, OPT_DESTINATION, &cs.fw6.ipv6.invflags,
1283 cs.invert);
1284 dhostnetworkmask = optarg;
1285 break;
1286
1287 #ifdef IP6T_F_GOTO
1288 case 'g':
1289 set_option(&cs.options, OPT_JUMP, &cs.fw6.ipv6.invflags,
1290 cs.invert);
1291 cs.fw6.ipv6.flags |= IP6T_F_GOTO;
1292 cs.jumpto = xt_parse_target(optarg);
1293 break;
1294 #endif
1295
1296 case 'j':
1297 set_option(&cs.options, OPT_JUMP, &cs.fw6.ipv6.invflags,
1298 cs.invert);
1299 command_jump(&cs, optarg);
1300 break;
1301
1302
1303 case 'i':
1304 if (*optarg == '\0')
1305 xtables_error(PARAMETER_PROBLEM,
1306 "Empty interface is likely to be "
1307 "undesired");
1308 set_option(&cs.options, OPT_VIANAMEIN, &cs.fw6.ipv6.invflags,
1309 cs.invert);
1310 xtables_parse_interface(optarg,
1311 cs.fw6.ipv6.iniface,
1312 cs.fw6.ipv6.iniface_mask);
1313 break;
1314
1315 case 'o':
1316 if (*optarg == '\0')
1317 xtables_error(PARAMETER_PROBLEM,
1318 "Empty interface is likely to be "
1319 "undesired");
1320 set_option(&cs.options, OPT_VIANAMEOUT, &cs.fw6.ipv6.invflags,
1321 cs.invert);
1322 xtables_parse_interface(optarg,
1323 cs.fw6.ipv6.outiface,
1324 cs.fw6.ipv6.outiface_mask);
1325 break;
1326
1327 case 'v':
1328 if (!verbose)
1329 set_option(&cs.options, OPT_VERBOSE,
1330 &cs.fw6.ipv6.invflags, cs.invert);
1331 verbose++;
1332 break;
1333
1334 case 'w':
1335 if (restore) {
1336 xtables_error(PARAMETER_PROBLEM,
1337 "You cannot use `-w' from "
1338 "ip6tables-restore");
1339 }
1340 wait = parse_wait_time(argc, argv);
1341 break;
1342
1343 case 'W':
1344 if (restore) {
1345 xtables_error(PARAMETER_PROBLEM,
1346 "You cannot use `-W' from "
1347 "ip6tables-restore");
1348 }
1349 parse_wait_interval(argc, argv, &wait_interval);
1350 wait_interval_set = true;
1351 break;
1352
1353 case 'm':
1354 command_match(&cs);
1355 break;
1356
1357 case 'n':
1358 set_option(&cs.options, OPT_NUMERIC, &cs.fw6.ipv6.invflags,
1359 cs.invert);
1360 break;
1361
1362 case 't':
1363 if (cs.invert)
1364 xtables_error(PARAMETER_PROBLEM,
1365 "unexpected ! flag before --table");
1366 if (restore && table_set)
1367 xtables_error(PARAMETER_PROBLEM,
1368 "The -t option (seen in line %u) cannot be used in %s.\n",
1369 line, xt_params->program_name);
1370 *table = optarg;
1371 table_set = true;
1372 break;
1373
1374 case 'x':
1375 set_option(&cs.options, OPT_EXPANDED, &cs.fw6.ipv6.invflags,
1376 cs.invert);
1377 break;
1378
1379 case 'V':
1380 if (cs.invert)
1381 printf("Not %s ;-)\n", prog_vers);
1382 else
1383 printf("%s v%s (legacy)\n",
1384 prog_name, prog_vers);
1385 exit(0);
1386
1387 case '0':
1388 set_option(&cs.options, OPT_LINENUMBERS, &cs.fw6.ipv6.invflags,
1389 cs.invert);
1390 break;
1391
1392 case 'M':
1393 xtables_modprobe_program = optarg;
1394 break;
1395
1396 case 'c':
1397
1398 set_option(&cs.options, OPT_COUNTERS, &cs.fw6.ipv6.invflags,
1399 cs.invert);
1400 pcnt = optarg;
1401 bcnt = strchr(pcnt + 1, ',');
1402 if (bcnt)
1403 bcnt++;
1404 if (!bcnt && xs_has_arg(argc, argv))
1405 bcnt = argv[optind++];
1406 if (!bcnt)
1407 xtables_error(PARAMETER_PROBLEM,
1408 "-%c requires packet and byte counter",
1409 opt2char(OPT_COUNTERS));
1410
1411 if (sscanf(pcnt, "%llu", &cnt) != 1)
1412 xtables_error(PARAMETER_PROBLEM,
1413 "-%c packet counter not numeric",
1414 opt2char(OPT_COUNTERS));
1415 cs.fw6.counters.pcnt = cnt;
1416
1417 if (sscanf(bcnt, "%llu", &cnt) != 1)
1418 xtables_error(PARAMETER_PROBLEM,
1419 "-%c byte counter not numeric",
1420 opt2char(OPT_COUNTERS));
1421 cs.fw6.counters.bcnt = cnt;
1422 break;
1423
1424 case '4':
1425 /* This is not the IPv4 iptables */
1426 if (line != -1)
1427 return 1; /* success: line ignored */
1428 fprintf(stderr, "This is the IPv6 version of ip6tables.\n");
1429 exit_tryhelp(2);
1430
1431 case '6':
1432 /* This is indeed the IPv6 ip6tables */
1433 break;
1434
1435 case 1: /* non option */
1436 if (optarg[0] == '!' && optarg[1] == '\0') {
1437 if (cs.invert)
1438 xtables_error(PARAMETER_PROBLEM,
1439 "multiple consecutive ! not"
1440 " allowed");
1441 cs.invert = true;
1442 optarg[0] = '\0';
1443 continue;
1444 }
1445 fprintf(stderr, "Bad argument `%s'\n", optarg);
1446 exit_tryhelp(2);
1447
1448 default:
1449 if (command_default(&cs, &ip6tables_globals) == 1)
1450 /*
1451 * If new options were loaded, we must retry
1452 * getopt immediately and not allow
1453 * cs.invert=false to be executed.
1454 */
1455 continue;
1456 break;
1457 }
1458 cs.invert = false;
1459 }
1460
1461 if (!wait && wait_interval_set)
1462 xtables_error(PARAMETER_PROBLEM,
1463 "--wait-interval only makes sense with --wait\n");
1464
1465 if (strcmp(*table, "nat") == 0 &&
1466 ((policy != NULL && strcmp(policy, "DROP") == 0) ||
1467 (cs.jumpto != NULL && strcmp(cs.jumpto, "DROP") == 0)))
1468 xtables_error(PARAMETER_PROBLEM,
1469 "\nThe \"nat\" table is not intended for filtering, "
1470 "the use of DROP is therefore inhibited.\n\n");
1471
1472 for (matchp = cs.matches; matchp; matchp = matchp->next)
1473 xtables_option_mfcall(matchp->match);
1474 if (cs.target != NULL)
1475 xtables_option_tfcall(cs.target);
1476
1477 /* Fix me: must put inverse options checking here --MN */
1478
1479 if (optind < argc)
1480 xtables_error(PARAMETER_PROBLEM,
1481 "unknown arguments found on commandline");
1482 if (!command)
1483 xtables_error(PARAMETER_PROBLEM, "no command specified");
1484 if (cs.invert)
1485 xtables_error(PARAMETER_PROBLEM,
1486 "nothing appropriate following !");
1487
1488 if (command & (CMD_REPLACE | CMD_INSERT | CMD_DELETE | CMD_APPEND | CMD_CHECK)) {
1489 if (!(cs.options & OPT_DESTINATION))
1490 dhostnetworkmask = "::0/0";
1491 if (!(cs.options & OPT_SOURCE))
1492 shostnetworkmask = "::0/0";
1493 }
1494
1495 if (shostnetworkmask)
1496 xtables_ip6parse_multiple(shostnetworkmask, &saddrs,
1497 &smasks, &nsaddrs);
1498
1499 if (dhostnetworkmask)
1500 xtables_ip6parse_multiple(dhostnetworkmask, &daddrs,
1501 &dmasks, &ndaddrs);
1502
1503 if ((nsaddrs > 1 || ndaddrs > 1) &&
1504 (cs.fw6.ipv6.invflags & (IP6T_INV_SRCIP | IP6T_INV_DSTIP)))
1505 xtables_error(PARAMETER_PROBLEM, "! not allowed with multiple"
1506 " source or destination IP addresses");
1507
1508 if (command == CMD_REPLACE && (nsaddrs != 1 || ndaddrs != 1))
1509 xtables_error(PARAMETER_PROBLEM, "Replacement rule does not "
1510 "specify a unique address");
1511
1512 generic_opt_check(command, cs.options);
1513
1514 /* Attempt to acquire the xtables lock */
1515 if (!restore)
1516 xtables_lock_or_exit(wait, &wait_interval);
1517
1518 /* only allocate handle if we weren't called with a handle */
1519 if (!*handle)
1520 *handle = ip6tc_init(*table);
1521
1522 /* try to insmod the module if iptc_init failed */
1523 if (!*handle && xtables_load_ko(xtables_modprobe_program, false) != -1)
1524 *handle = ip6tc_init(*table);
1525
1526 if (!*handle)
1527 xtables_error(VERSION_PROBLEM,
1528 "can't initialize ip6tables table `%s': %s",
1529 *table, ip6tc_strerror(errno));
1530
1531 if (command == CMD_APPEND
1532 || command == CMD_DELETE
1533 || command == CMD_CHECK
1534 || command == CMD_INSERT
1535 || command == CMD_REPLACE) {
1536 if (strcmp(chain, "PREROUTING") == 0
1537 || strcmp(chain, "INPUT") == 0) {
1538 /* -o not valid with incoming packets. */
1539 if (cs.options & OPT_VIANAMEOUT)
1540 xtables_error(PARAMETER_PROBLEM,
1541 "Can't use -%c with %s\n",
1542 opt2char(OPT_VIANAMEOUT),
1543 chain);
1544 }
1545
1546 if (strcmp(chain, "POSTROUTING") == 0
1547 || strcmp(chain, "OUTPUT") == 0) {
1548 /* -i not valid with outgoing packets */
1549 if (cs.options & OPT_VIANAMEIN)
1550 xtables_error(PARAMETER_PROBLEM,
1551 "Can't use -%c with %s\n",
1552 opt2char(OPT_VIANAMEIN),
1553 chain);
1554 }
1555
1556 if (cs.target && ip6tc_is_chain(cs.jumpto, *handle)) {
1557 fprintf(stderr,
1558 "Warning: using chain %s, not extension\n",
1559 cs.jumpto);
1560
1561 if (cs.target->t)
1562 free(cs.target->t);
1563
1564 cs.target = NULL;
1565 }
1566
1567 /* If they didn't specify a target, or it's a chain
1568 name, use standard. */
1569 if (!cs.target
1570 && (strlen(cs.jumpto) == 0
1571 || ip6tc_is_chain(cs.jumpto, *handle))) {
1572 size_t size;
1573
1574 cs.target = xtables_find_target(XT_STANDARD_TARGET,
1575 XTF_LOAD_MUST_SUCCEED);
1576
1577 size = sizeof(struct xt_entry_target)
1578 + cs.target->size;
1579 cs.target->t = xtables_calloc(1, size);
1580 cs.target->t->u.target_size = size;
1581 strcpy(cs.target->t->u.user.name, cs.jumpto);
1582 xs_init_target(cs.target);
1583 }
1584
1585 if (!cs.target) {
1586 /* It is no chain, and we can't load a plugin.
1587 * We cannot know if the plugin is corrupt, non
1588 * existent OR if the user just misspelled a
1589 * chain.
1590 */
1591 #ifdef IP6T_F_GOTO
1592 if (cs.fw6.ipv6.flags & IP6T_F_GOTO)
1593 xtables_error(PARAMETER_PROBLEM,
1594 "goto '%s' is not a chain\n",
1595 cs.jumpto);
1596 #endif
1597 xtables_find_target(cs.jumpto, XTF_LOAD_MUST_SUCCEED);
1598 } else {
1599 e = generate_entry(&cs.fw6, cs.matches, cs.target->t);
1600 free(cs.target->t);
1601 }
1602 }
1603
1604 switch (command) {
1605 case CMD_APPEND:
1606 ret = append_entry(chain, e,
1607 nsaddrs, saddrs, smasks,
1608 ndaddrs, daddrs, dmasks,
1609 cs.options&OPT_VERBOSE,
1610 *handle);
1611 break;
1612 case CMD_DELETE:
1613 ret = delete_entry(chain, e,
1614 nsaddrs, saddrs, smasks,
1615 ndaddrs, daddrs, dmasks,
1616 cs.options&OPT_VERBOSE,
1617 *handle, cs.matches, cs.target);
1618 break;
1619 case CMD_DELETE_NUM:
1620 ret = ip6tc_delete_num_entry(chain, rulenum - 1, *handle);
1621 break;
1622 case CMD_CHECK:
1623 ret = check_entry(chain, e,
1624 nsaddrs, saddrs, smasks,
1625 ndaddrs, daddrs, dmasks,
1626 cs.options&OPT_VERBOSE,
1627 *handle, cs.matches, cs.target);
1628 break;
1629 case CMD_REPLACE:
1630 ret = replace_entry(chain, e, rulenum - 1,
1631 saddrs, smasks, daddrs, dmasks,
1632 cs.options&OPT_VERBOSE, *handle);
1633 break;
1634 case CMD_INSERT:
1635 ret = insert_entry(chain, e, rulenum - 1,
1636 nsaddrs, saddrs, smasks,
1637 ndaddrs, daddrs, dmasks,
1638 cs.options&OPT_VERBOSE,
1639 *handle);
1640 break;
1641 case CMD_FLUSH:
1642 ret = flush_entries6(chain, cs.options&OPT_VERBOSE, *handle);
1643 break;
1644 case CMD_ZERO:
1645 ret = zero_entries(chain, cs.options&OPT_VERBOSE, *handle);
1646 break;
1647 case CMD_ZERO_NUM:
1648 ret = ip6tc_zero_counter(chain, rulenum, *handle);
1649 break;
1650 case CMD_LIST:
1651 case CMD_LIST|CMD_ZERO:
1652 case CMD_LIST|CMD_ZERO_NUM:
1653 ret = list_entries(chain,
1654 rulenum,
1655 cs.options&OPT_VERBOSE,
1656 cs.options&OPT_NUMERIC,
1657 cs.options&OPT_EXPANDED,
1658 cs.options&OPT_LINENUMBERS,
1659 *handle);
1660 if (ret && (command & CMD_ZERO))
1661 ret = zero_entries(chain,
1662 cs.options&OPT_VERBOSE, *handle);
1663 if (ret && (command & CMD_ZERO_NUM))
1664 ret = ip6tc_zero_counter(chain, rulenum, *handle);
1665 break;
1666 case CMD_LIST_RULES:
1667 case CMD_LIST_RULES|CMD_ZERO:
1668 case CMD_LIST_RULES|CMD_ZERO_NUM:
1669 ret = list_rules(chain,
1670 rulenum,
1671 cs.options&OPT_VERBOSE,
1672 *handle);
1673 if (ret && (command & CMD_ZERO))
1674 ret = zero_entries(chain,
1675 cs.options&OPT_VERBOSE, *handle);
1676 if (ret && (command & CMD_ZERO_NUM))
1677 ret = ip6tc_zero_counter(chain, rulenum, *handle);
1678 break;
1679 case CMD_NEW_CHAIN:
1680 ret = ip6tc_create_chain(chain, *handle);
1681 break;
1682 case CMD_DELETE_CHAIN:
1683 ret = delete_chain6(chain, cs.options&OPT_VERBOSE, *handle);
1684 break;
1685 case CMD_RENAME_CHAIN:
1686 ret = ip6tc_rename_chain(chain, newname, *handle);
1687 break;
1688 case CMD_SET_POLICY:
1689 ret = ip6tc_set_policy(chain, policy, cs.options&OPT_COUNTERS ? &cs.fw6.counters : NULL, *handle);
1690 break;
1691 default:
1692 /* We should never reach this... */
1693 exit_tryhelp(2);
1694 }
1695
1696 if (verbose > 1)
1697 dump_entries6(*handle);
1698
1699 xtables_rule_matches_free(&cs.matches);
1700
1701 if (e != NULL) {
1702 free(e);
1703 e = NULL;
1704 }
1705
1706 free(saddrs);
1707 free(smasks);
1708 free(daddrs);
1709 free(dmasks);
1710 xtables_free_opts(1);
1711
1712 return ret;
1713 }
1714