1 /* Code to take an ip6tables-style command line and do it. */ 2 3 /* 4 * Author: Paul.Russell (at) rustcorp.com.au and mneuling (at) radlogic.com.au 5 * 6 * (C) 2000-2002 by the netfilter coreteam <coreteam (at) netfilter.org>: 7 * Paul 'Rusty' Russell <rusty (at) rustcorp.com.au> 8 * Marc Boucher <marc+nf (at) mbsi.ca> 9 * James Morris <jmorris (at) intercode.com.au> 10 * Harald Welte <laforge (at) gnumonks.org> 11 * Jozsef Kadlecsik <kadlec (at) 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 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 #ifndef TRUE 49 #define TRUE 1 50 #endif 51 #ifndef FALSE 52 #define FALSE 0 53 #endif 54 55 #define CMD_NONE 0x0000U 56 #define CMD_INSERT 0x0001U 57 #define CMD_DELETE 0x0002U 58 #define CMD_DELETE_NUM 0x0004U 59 #define CMD_REPLACE 0x0008U 60 #define CMD_APPEND 0x0010U 61 #define CMD_LIST 0x0020U 62 #define CMD_FLUSH 0x0040U 63 #define CMD_ZERO 0x0080U 64 #define CMD_NEW_CHAIN 0x0100U 65 #define CMD_DELETE_CHAIN 0x0200U 66 #define CMD_SET_POLICY 0x0400U 67 #define CMD_RENAME_CHAIN 0x0800U 68 #define CMD_LIST_RULES 0x1000U 69 #define CMD_ZERO_NUM 0x2000U 70 #define CMD_CHECK 0x4000U 71 #define NUMBER_OF_CMD 16 72 static const char cmdflags[] = { 'I', 'D', 'D', 'R', 'A', 'L', 'F', 'Z', 73 'N', 'X', 'P', 'E', 'S', 'Z', 'C' }; 74 75 #define NUMBER_OF_OPT ARRAY_SIZE(optflags) 76 static const char optflags[] 77 = { 'n', 's', 'd', 'p', 'j', 'v', 'x', 'i', 'o', '0', 'c'}; 78 79 static struct option original_opts[] = { 80 {.name = "append", .has_arg = 1, .val = 'A'}, 81 {.name = "delete", .has_arg = 1, .val = 'D'}, 82 {.name = "check" , .has_arg = 1, .val = 'C'}, 83 {.name = "insert", .has_arg = 1, .val = 'I'}, 84 {.name = "replace", .has_arg = 1, .val = 'R'}, 85 {.name = "list", .has_arg = 2, .val = 'L'}, 86 {.name = "list-rules", .has_arg = 2, .val = 'S'}, 87 {.name = "flush", .has_arg = 2, .val = 'F'}, 88 {.name = "zero", .has_arg = 2, .val = 'Z'}, 89 {.name = "new-chain", .has_arg = 1, .val = 'N'}, 90 {.name = "delete-chain", .has_arg = 2, .val = 'X'}, 91 {.name = "rename-chain", .has_arg = 1, .val = 'E'}, 92 {.name = "policy", .has_arg = 1, .val = 'P'}, 93 {.name = "source", .has_arg = 1, .val = 's'}, 94 {.name = "destination", .has_arg = 1, .val = 'd'}, 95 {.name = "src", .has_arg = 1, .val = 's'}, /* synonym */ 96 {.name = "dst", .has_arg = 1, .val = 'd'}, /* synonym */ 97 {.name = "protocol", .has_arg = 1, .val = 'p'}, 98 {.name = "in-interface", .has_arg = 1, .val = 'i'}, 99 {.name = "jump", .has_arg = 1, .val = 'j'}, 100 {.name = "table", .has_arg = 1, .val = 't'}, 101 {.name = "match", .has_arg = 1, .val = 'm'}, 102 {.name = "numeric", .has_arg = 0, .val = 'n'}, 103 {.name = "out-interface", .has_arg = 1, .val = 'o'}, 104 {.name = "verbose", .has_arg = 0, .val = 'v'}, 105 {.name = "wait", .has_arg = 0, .val = 'w'}, 106 {.name = "exact", .has_arg = 0, .val = 'x'}, 107 {.name = "version", .has_arg = 0, .val = 'V'}, 108 {.name = "help", .has_arg = 2, .val = 'h'}, 109 {.name = "line-numbers", .has_arg = 0, .val = '0'}, 110 {.name = "modprobe", .has_arg = 1, .val = 'M'}, 111 {.name = "set-counters", .has_arg = 1, .val = 'c'}, 112 {.name = "goto", .has_arg = 1, .val = 'g'}, 113 {.name = "ipv4", .has_arg = 0, .val = '4'}, 114 {.name = "ipv6", .has_arg = 0, .val = '6'}, 115 {NULL}, 116 }; 117 118 void ip6tables_exit_error(enum xtables_exittype status, const char *msg, ...) __attribute__((noreturn, format(printf,2,3))); 119 struct xtables_globals ip6tables_globals = { 120 .option_offset = 0, 121 .program_version = IPTABLES_VERSION, 122 .orig_opts = original_opts, 123 .exit_err = ip6tables_exit_error, 124 }; 125 126 /* Table of legal combinations of commands and options. If any of the 127 * given commands make an option legal, that option is legal (applies to 128 * CMD_LIST and CMD_ZERO only). 129 * Key: 130 * + compulsory 131 * x illegal 132 * optional 133 */ 134 135 static const char commands_v_options[NUMBER_OF_CMD][NUMBER_OF_OPT] = 136 /* Well, it's better than "Re: Linux vs FreeBSD" */ 137 { 138 /* -n -s -d -p -j -v -x -i -o --line -c */ 139 /*INSERT*/ {'x',' ',' ',' ',' ',' ','x',' ',' ','x',' '}, 140 /*DELETE*/ {'x',' ',' ',' ',' ',' ','x',' ',' ','x','x'}, 141 /*DELETE_NUM*/{'x','x','x','x','x',' ','x','x','x','x','x'}, 142 /*REPLACE*/ {'x',' ',' ',' ',' ',' ','x',' ',' ','x',' '}, 143 /*APPEND*/ {'x',' ',' ',' ',' ',' ','x',' ',' ','x',' '}, 144 /*LIST*/ {' ','x','x','x','x',' ',' ','x','x',' ','x'}, 145 /*FLUSH*/ {'x','x','x','x','x',' ','x','x','x','x','x'}, 146 /*ZERO*/ {'x','x','x','x','x',' ','x','x','x','x','x'}, 147 /*ZERO_NUM*/ {'x','x','x','x','x',' ','x','x','x','x','x'}, 148 /*NEW_CHAIN*/ {'x','x','x','x','x',' ','x','x','x','x','x'}, 149 /*DEL_CHAIN*/ {'x','x','x','x','x',' ','x','x','x','x','x'}, 150 /*SET_POLICY*/{'x','x','x','x','x',' ','x','x','x','x',' '}, 151 /*RENAME*/ {'x','x','x','x','x',' ','x','x','x','x','x'}, 152 /*LIST_RULES*/{'x','x','x','x','x',' ','x','x','x','x','x'}, 153 /*CHECK*/ {'x',' ',' ',' ',' ',' ','x',' ',' ','x','x'}, 154 }; 155 156 static const unsigned int inverse_for_options[NUMBER_OF_OPT] = 157 { 158 /* -n */ 0, 159 /* -s */ IP6T_INV_SRCIP, 160 /* -d */ IP6T_INV_DSTIP, 161 /* -p */ XT_INV_PROTO, 162 /* -j */ 0, 163 /* -v */ 0, 164 /* -x */ 0, 165 /* -i */ IP6T_INV_VIA_IN, 166 /* -o */ IP6T_INV_VIA_OUT, 167 /*--line*/ 0, 168 /* -c */ 0, 169 }; 170 171 #define opts ip6tables_globals.opts 172 #define prog_name ip6tables_globals.program_name 173 #define prog_vers ip6tables_globals.program_version 174 /* A few hardcoded protocols for 'all' and in case the user has no 175 /etc/protocols */ 176 struct pprot { 177 const char *name; 178 uint8_t num; 179 }; 180 181 static void __attribute__((noreturn)) 182 exit_tryhelp(int status) 183 { 184 if (line != -1) 185 fprintf(stderr, "Error occurred at line: %d\n", line); 186 fprintf(stderr, "Try `%s -h' or '%s --help' for more information.\n", 187 prog_name, prog_name); 188 xtables_free_opts(1); 189 exit(status); 190 } 191 192 static void 193 exit_printhelp(const struct xtables_rule_match *matches) 194 { 195 printf("%s v%s\n\n" 196 "Usage: %s -[ACD] chain rule-specification [options]\n" 197 " %s -I chain [rulenum] rule-specification [options]\n" 198 " %s -R chain rulenum rule-specification [options]\n" 199 " %s -D chain rulenum [options]\n" 200 " %s -[LS] [chain [rulenum]] [options]\n" 201 " %s -[FZ] [chain] [options]\n" 202 " %s -[NX] chain\n" 203 " %s -E old-chain-name new-chain-name\n" 204 " %s -P chain target [options]\n" 205 " %s -h (print this help information)\n\n", 206 prog_name, prog_vers, prog_name, prog_name, 207 prog_name, prog_name, prog_name, prog_name, 208 prog_name, prog_name, prog_name, prog_name); 209 210 printf( 211 "Commands:\n" 212 "Either long or short options are allowed.\n" 213 " --append -A chain Append to chain\n" 214 " --check -C chain Check for the existence of a rule\n" 215 " --delete -D chain Delete matching rule from chain\n" 216 " --delete -D chain rulenum\n" 217 " Delete rule rulenum (1 = first) from chain\n" 218 " --insert -I chain [rulenum]\n" 219 " Insert in chain as rulenum (default 1=first)\n" 220 " --replace -R chain rulenum\n" 221 " Replace rule rulenum (1 = first) in chain\n" 222 " --list -L [chain [rulenum]]\n" 223 " List the rules in a chain or all chains\n" 224 " --list-rules -S [chain [rulenum]]\n" 225 " Print the rules in a chain or all chains\n" 226 " --flush -F [chain] Delete all rules in chain or all chains\n" 227 " --zero -Z [chain [rulenum]]\n" 228 " Zero counters in chain or all chains\n" 229 " --new -N chain Create a new user-defined chain\n" 230 " --delete-chain\n" 231 " -X [chain] Delete a user-defined chain\n" 232 " --policy -P chain target\n" 233 " Change policy on chain to target\n" 234 " --rename-chain\n" 235 " -E old-chain new-chain\n" 236 " Change chain name, (moving any references)\n" 237 238 "Options:\n" 239 " --ipv4 -4 Error (line is ignored by ip6tables-restore)\n" 240 " --ipv6 -6 Nothing (line is ignored by iptables-restore)\n" 241 "[!] --protocol -p proto protocol: by number or name, eg. `tcp'\n" 242 "[!] --source -s address[/mask][,...]\n" 243 " source specification\n" 244 "[!] --destination -d address[/mask][,...]\n" 245 " destination specification\n" 246 "[!] --in-interface -i input name[+]\n" 247 " network interface name ([+] for wildcard)\n" 248 " --jump -j target\n" 249 " target for rule (may load target extension)\n" 250 #ifdef IP6T_F_GOTO 251 " --goto -g chain\n" 252 " jump to chain with no return\n" 253 #endif 254 " --match -m match\n" 255 " extended match (may load extension)\n" 256 " --numeric -n numeric output of addresses and ports\n" 257 "[!] --out-interface -o output name[+]\n" 258 " network interface name ([+] for wildcard)\n" 259 " --table -t table table to manipulate (default: `filter')\n" 260 " --verbose -v verbose mode\n" 261 " --wait -w wait for the xtables lock\n" 262 " --line-numbers print line numbers when listing\n" 263 " --exact -x expand numbers (display exact values)\n" 264 /*"[!] --fragment -f match second or further fragments only\n"*/ 265 " --modprobe=<command> try to insert modules using this command\n" 266 " --set-counters PKTS BYTES set the counter during insert/append\n" 267 "[!] --version -V print package version.\n"); 268 269 print_extension_helps(xtables_targets, matches); 270 exit(0); 271 } 272 273 void 274 ip6tables_exit_error(enum xtables_exittype status, const char *msg, ...) 275 { 276 va_list args; 277 278 va_start(args, msg); 279 fprintf(stderr, "%s v%s: ", prog_name, prog_vers); 280 vfprintf(stderr, msg, args); 281 va_end(args); 282 fprintf(stderr, "\n"); 283 if (status == PARAMETER_PROBLEM) 284 exit_tryhelp(status); 285 if (status == VERSION_PROBLEM) 286 fprintf(stderr, 287 "Perhaps ip6tables or your kernel needs to be upgraded.\n"); 288 /* On error paths, make sure that we don't leak memory */ 289 xtables_free_opts(1); 290 exit(status); 291 } 292 293 static void 294 generic_opt_check(int command, int options) 295 { 296 int i, j, legal = 0; 297 298 /* Check that commands are valid with options. Complicated by the 299 * fact that if an option is legal with *any* command given, it is 300 * legal overall (ie. -z and -l). 301 */ 302 for (i = 0; i < NUMBER_OF_OPT; i++) { 303 legal = 0; /* -1 => illegal, 1 => legal, 0 => undecided. */ 304 305 for (j = 0; j < NUMBER_OF_CMD; j++) { 306 if (!(command & (1<<j))) 307 continue; 308 309 if (!(options & (1<<i))) { 310 if (commands_v_options[j][i] == '+') 311 xtables_error(PARAMETER_PROBLEM, 312 "You need to supply the `-%c' " 313 "option for this command\n", 314 optflags[i]); 315 } else { 316 if (commands_v_options[j][i] != 'x') 317 legal = 1; 318 else if (legal == 0) 319 legal = -1; 320 } 321 } 322 if (legal == -1) 323 xtables_error(PARAMETER_PROBLEM, 324 "Illegal option `-%c' with this command\n", 325 optflags[i]); 326 } 327 } 328 329 static char 330 opt2char(int option) 331 { 332 const char *ptr; 333 for (ptr = optflags; option > 1; option >>= 1, ptr++); 334 335 return *ptr; 336 } 337 338 static char 339 cmd2char(int option) 340 { 341 const char *ptr; 342 for (ptr = cmdflags; option > 1; option >>= 1, ptr++); 343 344 return *ptr; 345 } 346 347 static void 348 add_command(unsigned int *cmd, const int newcmd, const int othercmds, 349 int invert) 350 { 351 if (invert) 352 xtables_error(PARAMETER_PROBLEM, "unexpected '!' flag"); 353 if (*cmd & (~othercmds)) 354 xtables_error(PARAMETER_PROBLEM, "Cannot use -%c with -%c\n", 355 cmd2char(newcmd), cmd2char(*cmd & (~othercmds))); 356 *cmd |= newcmd; 357 } 358 359 /* 360 * All functions starting with "parse" should succeed, otherwise 361 * the program fails. 362 * Most routines return pointers to static data that may change 363 * between calls to the same or other routines with a few exceptions: 364 * "host_to_addr", "parse_hostnetwork", and "parse_hostnetworkmask" 365 * return global static data. 366 */ 367 368 /* These are invalid numbers as upper layer protocol */ 369 static int is_exthdr(uint16_t proto) 370 { 371 return (proto == IPPROTO_ROUTING || 372 proto == IPPROTO_FRAGMENT || 373 proto == IPPROTO_AH || 374 proto == IPPROTO_DSTOPTS); 375 } 376 377 /* Can't be zero. */ 378 static int 379 parse_rulenumber(const char *rule) 380 { 381 unsigned int rulenum; 382 383 if (!xtables_strtoui(rule, NULL, &rulenum, 1, INT_MAX)) 384 xtables_error(PARAMETER_PROBLEM, 385 "Invalid rule number `%s'", rule); 386 387 return rulenum; 388 } 389 390 static const char * 391 parse_target(const char *targetname) 392 { 393 const char *ptr; 394 395 if (strlen(targetname) < 1) 396 xtables_error(PARAMETER_PROBLEM, 397 "Invalid target name (too short)"); 398 399 if (strlen(targetname) >= XT_EXTENSION_MAXNAMELEN) 400 xtables_error(PARAMETER_PROBLEM, 401 "Invalid target name `%s' (%u chars max)", 402 targetname, XT_EXTENSION_MAXNAMELEN - 1); 403 404 for (ptr = targetname; *ptr; ptr++) 405 if (isspace(*ptr)) 406 xtables_error(PARAMETER_PROBLEM, 407 "Invalid target name `%s'", targetname); 408 return targetname; 409 } 410 411 static void 412 set_option(unsigned int *options, unsigned int option, uint8_t *invflg, 413 int invert) 414 { 415 if (*options & option) 416 xtables_error(PARAMETER_PROBLEM, "multiple -%c flags not allowed", 417 opt2char(option)); 418 *options |= option; 419 420 if (invert) { 421 unsigned int i; 422 for (i = 0; 1 << i != option; i++); 423 424 if (!inverse_for_options[i]) 425 xtables_error(PARAMETER_PROBLEM, 426 "cannot have ! before -%c", 427 opt2char(option)); 428 *invflg |= inverse_for_options[i]; 429 } 430 } 431 432 433 static void 434 print_header(unsigned int format, const char *chain, struct xtc_handle *handle) 435 { 436 struct xt_counters counters; 437 const char *pol = ip6tc_get_policy(chain, &counters, handle); 438 printf("Chain %s", chain); 439 if (pol) { 440 printf(" (policy %s", pol); 441 if (!(format & FMT_NOCOUNTS)) { 442 fputc(' ', stdout); 443 xtables_print_num(counters.pcnt, (format|FMT_NOTABLE)); 444 fputs("packets, ", stdout); 445 xtables_print_num(counters.bcnt, (format|FMT_NOTABLE)); 446 fputs("bytes", stdout); 447 } 448 printf(")\n"); 449 } else { 450 unsigned int refs; 451 if (!ip6tc_get_references(&refs, chain, handle)) 452 printf(" (ERROR obtaining refs)\n"); 453 else 454 printf(" (%u references)\n", refs); 455 } 456 457 if (format & FMT_LINENUMBERS) 458 printf(FMT("%-4s ", "%s "), "num"); 459 if (!(format & FMT_NOCOUNTS)) { 460 if (format & FMT_KILOMEGAGIGA) { 461 printf(FMT("%5s ","%s "), "pkts"); 462 printf(FMT("%5s ","%s "), "bytes"); 463 } else { 464 printf(FMT("%8s ","%s "), "pkts"); 465 printf(FMT("%10s ","%s "), "bytes"); 466 } 467 } 468 if (!(format & FMT_NOTARGET)) 469 printf(FMT("%-9s ","%s "), "target"); 470 fputs(" prot ", stdout); 471 if (format & FMT_OPTIONS) 472 fputs("opt", stdout); 473 if (format & FMT_VIA) { 474 printf(FMT(" %-6s ","%s "), "in"); 475 printf(FMT("%-6s ","%s "), "out"); 476 } 477 printf(FMT(" %-19s ","%s "), "source"); 478 printf(FMT(" %-19s "," %s "), "destination"); 479 printf("\n"); 480 } 481 482 483 static int 484 print_match(const struct xt_entry_match *m, 485 const struct ip6t_ip6 *ip, 486 int numeric) 487 { 488 const struct xtables_match *match = 489 xtables_find_match(m->u.user.name, XTF_TRY_LOAD, NULL); 490 491 if (match) { 492 if (match->print) 493 match->print(ip, m, numeric); 494 else 495 printf("%s ", match->name); 496 } else { 497 if (m->u.user.name[0]) 498 printf("UNKNOWN match `%s' ", m->u.user.name); 499 } 500 /* Don't stop iterating. */ 501 return 0; 502 } 503 504 /* e is called `fw' here for historical reasons */ 505 static void 506 print_firewall(const struct ip6t_entry *fw, 507 const char *targname, 508 unsigned int num, 509 unsigned int format, 510 struct xtc_handle *const handle) 511 { 512 const struct xtables_target *target = NULL; 513 const struct xt_entry_target *t; 514 char buf[BUFSIZ]; 515 516 if (!ip6tc_is_chain(targname, handle)) 517 target = xtables_find_target(targname, XTF_TRY_LOAD); 518 else 519 target = xtables_find_target(XT_STANDARD_TARGET, 520 XTF_LOAD_MUST_SUCCEED); 521 522 t = ip6t_get_target((struct ip6t_entry *)fw); 523 524 if (format & FMT_LINENUMBERS) 525 printf(FMT("%-4u ", "%u "), num); 526 527 if (!(format & FMT_NOCOUNTS)) { 528 xtables_print_num(fw->counters.pcnt, format); 529 xtables_print_num(fw->counters.bcnt, format); 530 } 531 532 if (!(format & FMT_NOTARGET)) 533 printf(FMT("%-9s ", "%s "), targname); 534 535 fputc(fw->ipv6.invflags & XT_INV_PROTO ? '!' : ' ', stdout); 536 { 537 const char *pname = proto_to_name(fw->ipv6.proto, format&FMT_NUMERIC); 538 if (pname) 539 printf(FMT("%-5s", "%s "), pname); 540 else 541 printf(FMT("%-5hu", "%hu "), fw->ipv6.proto); 542 } 543 544 if (format & FMT_OPTIONS) { 545 if (format & FMT_NOTABLE) 546 fputs("opt ", stdout); 547 fputc(' ', stdout); /* Invert flag of FRAG */ 548 fputc(' ', stdout); /* -f */ 549 fputc(' ', stdout); 550 } 551 552 if (format & FMT_VIA) { 553 char iface[IFNAMSIZ+2]; 554 555 if (fw->ipv6.invflags & IP6T_INV_VIA_IN) { 556 iface[0] = '!'; 557 iface[1] = '\0'; 558 } 559 else iface[0] = '\0'; 560 561 if (fw->ipv6.iniface[0] != '\0') { 562 strcat(iface, fw->ipv6.iniface); 563 } 564 else if (format & FMT_NUMERIC) strcat(iface, "*"); 565 else strcat(iface, "any"); 566 printf(FMT(" %-6s ","in %s "), iface); 567 568 if (fw->ipv6.invflags & IP6T_INV_VIA_OUT) { 569 iface[0] = '!'; 570 iface[1] = '\0'; 571 } 572 else iface[0] = '\0'; 573 574 if (fw->ipv6.outiface[0] != '\0') { 575 strcat(iface, fw->ipv6.outiface); 576 } 577 else if (format & FMT_NUMERIC) strcat(iface, "*"); 578 else strcat(iface, "any"); 579 printf(FMT("%-6s ","out %s "), iface); 580 } 581 582 fputc(fw->ipv6.invflags & IP6T_INV_SRCIP ? '!' : ' ', stdout); 583 if (!memcmp(&fw->ipv6.smsk, &in6addr_any, sizeof in6addr_any) 584 && !(format & FMT_NUMERIC)) 585 printf(FMT("%-19s ","%s "), "anywhere"); 586 else { 587 if (format & FMT_NUMERIC) 588 strcpy(buf, xtables_ip6addr_to_numeric(&fw->ipv6.src)); 589 else 590 strcpy(buf, xtables_ip6addr_to_anyname(&fw->ipv6.src)); 591 strcat(buf, xtables_ip6mask_to_numeric(&fw->ipv6.smsk)); 592 printf(FMT("%-19s ","%s "), buf); 593 } 594 595 fputc(fw->ipv6.invflags & IP6T_INV_DSTIP ? '!' : ' ', stdout); 596 if (!memcmp(&fw->ipv6.dmsk, &in6addr_any, sizeof in6addr_any) 597 && !(format & FMT_NUMERIC)) 598 printf(FMT("%-19s ","-> %s"), "anywhere"); 599 else { 600 if (format & FMT_NUMERIC) 601 strcpy(buf, xtables_ip6addr_to_numeric(&fw->ipv6.dst)); 602 else 603 strcpy(buf, xtables_ip6addr_to_anyname(&fw->ipv6.dst)); 604 strcat(buf, xtables_ip6mask_to_numeric(&fw->ipv6.dmsk)); 605 printf(FMT("%-19s ","-> %s"), buf); 606 } 607 608 if (format & FMT_NOTABLE) 609 fputs(" ", stdout); 610 611 #ifdef IP6T_F_GOTO 612 if(fw->ipv6.flags & IP6T_F_GOTO) 613 printf("[goto] "); 614 #endif 615 616 IP6T_MATCH_ITERATE(fw, print_match, &fw->ipv6, format & FMT_NUMERIC); 617 618 if (target) { 619 if (target->print) 620 /* Print the target information. */ 621 target->print(&fw->ipv6, t, format & FMT_NUMERIC); 622 } else if (t->u.target_size != sizeof(*t)) 623 printf("[%u bytes of unknown target data] ", 624 (unsigned int)(t->u.target_size - sizeof(*t))); 625 626 if (!(format & FMT_NONEWLINE)) 627 fputc('\n', stdout); 628 } 629 630 static void 631 print_firewall_line(const struct ip6t_entry *fw, 632 struct xtc_handle *const h) 633 { 634 struct xt_entry_target *t; 635 636 t = ip6t_get_target((struct ip6t_entry *)fw); 637 print_firewall(fw, t->u.user.name, 0, FMT_PRINT_RULE, h); 638 } 639 640 static int 641 append_entry(const xt_chainlabel chain, 642 struct ip6t_entry *fw, 643 unsigned int nsaddrs, 644 const struct in6_addr saddrs[], 645 const struct in6_addr smasks[], 646 unsigned int ndaddrs, 647 const struct in6_addr daddrs[], 648 const struct in6_addr dmasks[], 649 int verbose, 650 struct xtc_handle *handle) 651 { 652 unsigned int i, j; 653 int ret = 1; 654 655 for (i = 0; i < nsaddrs; i++) { 656 fw->ipv6.src = saddrs[i]; 657 fw->ipv6.smsk = smasks[i]; 658 for (j = 0; j < ndaddrs; j++) { 659 fw->ipv6.dst = daddrs[j]; 660 fw->ipv6.dmsk = dmasks[j]; 661 if (verbose) 662 print_firewall_line(fw, handle); 663 ret &= ip6tc_append_entry(chain, fw, handle); 664 } 665 } 666 667 return ret; 668 } 669 670 static int 671 replace_entry(const xt_chainlabel chain, 672 struct ip6t_entry *fw, 673 unsigned int rulenum, 674 const struct in6_addr *saddr, const struct in6_addr *smask, 675 const struct in6_addr *daddr, const struct in6_addr *dmask, 676 int verbose, 677 struct xtc_handle *handle) 678 { 679 fw->ipv6.src = *saddr; 680 fw->ipv6.dst = *daddr; 681 fw->ipv6.smsk = *smask; 682 fw->ipv6.dmsk = *dmask; 683 684 if (verbose) 685 print_firewall_line(fw, handle); 686 return ip6tc_replace_entry(chain, fw, rulenum, handle); 687 } 688 689 static int 690 insert_entry(const xt_chainlabel chain, 691 struct ip6t_entry *fw, 692 unsigned int rulenum, 693 unsigned int nsaddrs, 694 const struct in6_addr saddrs[], 695 const struct in6_addr smasks[], 696 unsigned int ndaddrs, 697 const struct in6_addr daddrs[], 698 const struct in6_addr dmasks[], 699 int verbose, 700 struct xtc_handle *handle) 701 { 702 unsigned int i, j; 703 int ret = 1; 704 705 for (i = 0; i < nsaddrs; i++) { 706 fw->ipv6.src = saddrs[i]; 707 fw->ipv6.smsk = smasks[i]; 708 for (j = 0; j < ndaddrs; j++) { 709 fw->ipv6.dst = daddrs[j]; 710 fw->ipv6.dmsk = dmasks[j]; 711 if (verbose) 712 print_firewall_line(fw, handle); 713 ret &= ip6tc_insert_entry(chain, fw, rulenum, handle); 714 } 715 } 716 717 return ret; 718 } 719 720 static unsigned char * 721 make_delete_mask(const struct xtables_rule_match *matches, 722 const struct xtables_target *target) 723 { 724 /* Establish mask for comparison */ 725 unsigned int size; 726 const struct xtables_rule_match *matchp; 727 unsigned char *mask, *mptr; 728 729 size = sizeof(struct ip6t_entry); 730 for (matchp = matches; matchp; matchp = matchp->next) 731 size += XT_ALIGN(sizeof(struct xt_entry_match)) + matchp->match->size; 732 733 mask = xtables_calloc(1, size 734 + XT_ALIGN(sizeof(struct xt_entry_target)) 735 + target->size); 736 737 memset(mask, 0xFF, sizeof(struct ip6t_entry)); 738 mptr = mask + sizeof(struct ip6t_entry); 739 740 for (matchp = matches; matchp; matchp = matchp->next) { 741 memset(mptr, 0xFF, 742 XT_ALIGN(sizeof(struct xt_entry_match)) 743 + matchp->match->userspacesize); 744 mptr += XT_ALIGN(sizeof(struct xt_entry_match)) + matchp->match->size; 745 } 746 747 memset(mptr, 0xFF, 748 XT_ALIGN(sizeof(struct xt_entry_target)) 749 + target->userspacesize); 750 751 return mask; 752 } 753 754 static int 755 delete_entry(const xt_chainlabel chain, 756 struct ip6t_entry *fw, 757 unsigned int nsaddrs, 758 const struct in6_addr saddrs[], 759 const struct in6_addr smasks[], 760 unsigned int ndaddrs, 761 const struct in6_addr daddrs[], 762 const struct in6_addr dmasks[], 763 int verbose, 764 struct xtc_handle *handle, 765 struct xtables_rule_match *matches, 766 const struct xtables_target *target) 767 { 768 unsigned int i, j; 769 int ret = 1; 770 unsigned char *mask; 771 772 mask = make_delete_mask(matches, target); 773 for (i = 0; i < nsaddrs; i++) { 774 fw->ipv6.src = saddrs[i]; 775 fw->ipv6.smsk = smasks[i]; 776 for (j = 0; j < ndaddrs; j++) { 777 fw->ipv6.dst = daddrs[j]; 778 fw->ipv6.dmsk = dmasks[j]; 779 if (verbose) 780 print_firewall_line(fw, handle); 781 ret &= ip6tc_delete_entry(chain, fw, mask, handle); 782 } 783 } 784 free(mask); 785 786 return ret; 787 } 788 789 static int 790 check_entry(const xt_chainlabel chain, struct ip6t_entry *fw, 791 unsigned int nsaddrs, const struct in6_addr *saddrs, 792 const struct in6_addr *smasks, unsigned int ndaddrs, 793 const struct in6_addr *daddrs, const struct in6_addr *dmasks, 794 bool verbose, struct xtc_handle *handle, 795 struct xtables_rule_match *matches, 796 const struct xtables_target *target) 797 { 798 unsigned int i, j; 799 int ret = 1; 800 unsigned char *mask; 801 802 mask = make_delete_mask(matches, target); 803 for (i = 0; i < nsaddrs; i++) { 804 fw->ipv6.src = saddrs[i]; 805 fw->ipv6.smsk = smasks[i]; 806 for (j = 0; j < ndaddrs; j++) { 807 fw->ipv6.dst = daddrs[j]; 808 fw->ipv6.dmsk = dmasks[j]; 809 if (verbose) 810 print_firewall_line(fw, handle); 811 ret &= ip6tc_check_entry(chain, fw, mask, handle); 812 } 813 } 814 815 free(mask); 816 return ret; 817 } 818 819 int 820 for_each_chain6(int (*fn)(const xt_chainlabel, int, struct xtc_handle *), 821 int verbose, int builtinstoo, struct xtc_handle *handle) 822 { 823 int ret = 1; 824 const char *chain; 825 char *chains; 826 unsigned int i, chaincount = 0; 827 828 chain = ip6tc_first_chain(handle); 829 while (chain) { 830 chaincount++; 831 chain = ip6tc_next_chain(handle); 832 } 833 834 chains = xtables_malloc(sizeof(xt_chainlabel) * chaincount); 835 i = 0; 836 chain = ip6tc_first_chain(handle); 837 while (chain) { 838 strcpy(chains + i*sizeof(xt_chainlabel), chain); 839 i++; 840 chain = ip6tc_next_chain(handle); 841 } 842 843 for (i = 0; i < chaincount; i++) { 844 if (!builtinstoo 845 && ip6tc_builtin(chains + i*sizeof(xt_chainlabel), 846 handle) == 1) 847 continue; 848 ret &= fn(chains + i*sizeof(xt_chainlabel), verbose, handle); 849 } 850 851 free(chains); 852 return ret; 853 } 854 855 int 856 flush_entries6(const xt_chainlabel chain, int verbose, 857 struct xtc_handle *handle) 858 { 859 if (!chain) 860 return for_each_chain6(flush_entries6, verbose, 1, handle); 861 862 if (verbose) 863 fprintf(stdout, "Flushing chain `%s'\n", chain); 864 return ip6tc_flush_entries(chain, handle); 865 } 866 867 static int 868 zero_entries(const xt_chainlabel chain, int verbose, 869 struct xtc_handle *handle) 870 { 871 if (!chain) 872 return for_each_chain6(zero_entries, verbose, 1, handle); 873 874 if (verbose) 875 fprintf(stdout, "Zeroing chain `%s'\n", chain); 876 return ip6tc_zero_entries(chain, handle); 877 } 878 879 int 880 delete_chain6(const xt_chainlabel chain, int verbose, 881 struct xtc_handle *handle) 882 { 883 if (!chain) 884 return for_each_chain6(delete_chain6, verbose, 0, handle); 885 886 if (verbose) 887 fprintf(stdout, "Deleting chain `%s'\n", chain); 888 return ip6tc_delete_chain(chain, handle); 889 } 890 891 static int 892 list_entries(const xt_chainlabel chain, int rulenum, int verbose, int numeric, 893 int expanded, int linenumbers, struct xtc_handle *handle) 894 { 895 int found = 0; 896 unsigned int format; 897 const char *this; 898 899 format = FMT_OPTIONS; 900 if (!verbose) 901 format |= FMT_NOCOUNTS; 902 else 903 format |= FMT_VIA; 904 905 if (numeric) 906 format |= FMT_NUMERIC; 907 908 if (!expanded) 909 format |= FMT_KILOMEGAGIGA; 910 911 if (linenumbers) 912 format |= FMT_LINENUMBERS; 913 914 for (this = ip6tc_first_chain(handle); 915 this; 916 this = ip6tc_next_chain(handle)) { 917 const struct ip6t_entry *i; 918 unsigned int num; 919 920 if (chain && strcmp(chain, this) != 0) 921 continue; 922 923 if (found) printf("\n"); 924 925 if (!rulenum) 926 print_header(format, this, handle); 927 i = ip6tc_first_rule(this, handle); 928 929 num = 0; 930 while (i) { 931 num++; 932 if (!rulenum || num == rulenum) 933 print_firewall(i, 934 ip6tc_get_target(i, handle), 935 num, 936 format, 937 handle); 938 i = ip6tc_next_rule(i, handle); 939 } 940 found = 1; 941 } 942 943 errno = ENOENT; 944 return found; 945 } 946 947 /* This assumes that mask is contiguous, and byte-bounded. */ 948 static void 949 print_iface(char letter, const char *iface, const unsigned char *mask, 950 int invert) 951 { 952 unsigned int i; 953 954 if (mask[0] == 0) 955 return; 956 957 printf("%s -%c ", invert ? " !" : "", letter); 958 959 for (i = 0; i < IFNAMSIZ; i++) { 960 if (mask[i] != 0) { 961 if (iface[i] != '\0') 962 printf("%c", iface[i]); 963 } else { 964 /* we can access iface[i-1] here, because 965 * a few lines above we make sure that mask[0] != 0 */ 966 if (iface[i-1] != '\0') 967 printf("+"); 968 break; 969 } 970 } 971 } 972 973 /* The ip6tables looks up the /etc/protocols. */ 974 static void print_proto(uint16_t proto, int invert) 975 { 976 if (proto) { 977 unsigned int i; 978 const char *invertstr = invert ? " !" : ""; 979 980 const struct protoent *pent = getprotobynumber(proto); 981 if (pent) { 982 printf("%s -p %s", 983 invertstr, pent->p_name); 984 return; 985 } 986 987 for (i = 0; xtables_chain_protos[i].name != NULL; ++i) 988 if (xtables_chain_protos[i].num == proto) { 989 printf("%s -p %s", 990 invertstr, xtables_chain_protos[i].name); 991 return; 992 } 993 994 printf("%s -p %u", invertstr, proto); 995 } 996 } 997 998 static int print_match_save(const struct xt_entry_match *e, 999 const struct ip6t_ip6 *ip) 1000 { 1001 const struct xtables_match *match = 1002 xtables_find_match(e->u.user.name, XTF_TRY_LOAD, NULL); 1003 1004 if (match) { 1005 printf(" -m %s", 1006 match->alias ? match->alias(e) : e->u.user.name); 1007 1008 /* some matches don't provide a save function */ 1009 if (match->save) 1010 match->save(ip, e); 1011 } else { 1012 if (e->u.match_size) { 1013 fprintf(stderr, 1014 "Can't find library for match `%s'\n", 1015 e->u.user.name); 1016 exit(1); 1017 } 1018 } 1019 return 0; 1020 } 1021 1022 /* print a given ip including mask if neccessary */ 1023 static void print_ip(const char *prefix, const struct in6_addr *ip, 1024 const struct in6_addr *mask, int invert) 1025 { 1026 char buf[51]; 1027 int l = xtables_ip6mask_to_cidr(mask); 1028 1029 if (l == 0 && !invert) 1030 return; 1031 1032 printf("%s %s %s", 1033 invert ? " !" : "", 1034 prefix, 1035 inet_ntop(AF_INET6, ip, buf, sizeof buf)); 1036 1037 if (l == -1) 1038 printf("/%s", inet_ntop(AF_INET6, mask, buf, sizeof buf)); 1039 else 1040 printf("/%d", l); 1041 } 1042 1043 /* We want this to be readable, so only print out neccessary fields. 1044 * Because that's the kind of world I want to live in. */ 1045 void print_rule6(const struct ip6t_entry *e, 1046 struct xtc_handle *h, const char *chain, int counters) 1047 { 1048 const struct xt_entry_target *t; 1049 const char *target_name; 1050 1051 /* print counters for iptables-save */ 1052 if (counters > 0) 1053 printf("[%llu:%llu] ", (unsigned long long)e->counters.pcnt, (unsigned long long)e->counters.bcnt); 1054 1055 /* print chain name */ 1056 printf("-A %s", chain); 1057 1058 /* Print IP part. */ 1059 print_ip("-s", &(e->ipv6.src), &(e->ipv6.smsk), 1060 e->ipv6.invflags & IP6T_INV_SRCIP); 1061 1062 print_ip("-d", &(e->ipv6.dst), &(e->ipv6.dmsk), 1063 e->ipv6.invflags & IP6T_INV_DSTIP); 1064 1065 print_iface('i', e->ipv6.iniface, e->ipv6.iniface_mask, 1066 e->ipv6.invflags & IP6T_INV_VIA_IN); 1067 1068 print_iface('o', e->ipv6.outiface, e->ipv6.outiface_mask, 1069 e->ipv6.invflags & IP6T_INV_VIA_OUT); 1070 1071 print_proto(e->ipv6.proto, e->ipv6.invflags & XT_INV_PROTO); 1072 1073 #if 0 1074 /* not definied in ipv6 1075 * FIXME: linux/netfilter_ipv6/ip6_tables: IP6T_INV_FRAG why definied? */ 1076 if (e->ipv6.flags & IPT_F_FRAG) 1077 printf("%s -f", 1078 e->ipv6.invflags & IP6T_INV_FRAG ? " !" : ""); 1079 #endif 1080 1081 if (e->ipv6.flags & IP6T_F_TOS) 1082 printf("%s -? %d", 1083 e->ipv6.invflags & IP6T_INV_TOS ? " !" : "", 1084 e->ipv6.tos); 1085 1086 /* Print matchinfo part */ 1087 if (e->target_offset) { 1088 IP6T_MATCH_ITERATE(e, print_match_save, &e->ipv6); 1089 } 1090 1091 /* print counters for iptables -R */ 1092 if (counters < 0) 1093 printf(" -c %llu %llu", (unsigned long long)e->counters.pcnt, (unsigned long long)e->counters.bcnt); 1094 1095 /* Print target name and targinfo part */ 1096 target_name = ip6tc_get_target(e, h); 1097 t = ip6t_get_target((struct ip6t_entry *)e); 1098 if (t->u.user.name[0]) { 1099 struct xtables_target *target = 1100 xtables_find_target(t->u.user.name, XTF_TRY_LOAD); 1101 1102 if (!target) { 1103 fprintf(stderr, "Can't find library for target `%s'\n", 1104 t->u.user.name); 1105 exit(1); 1106 } 1107 1108 printf(" -j %s", target->alias ? target->alias(t) : target_name); 1109 if (target->save) 1110 target->save(&e->ipv6, t); 1111 else { 1112 /* If the target size is greater than xt_entry_target 1113 * there is something to be saved, we just don't know 1114 * how to print it */ 1115 if (t->u.target_size != 1116 sizeof(struct xt_entry_target)) { 1117 fprintf(stderr, "Target `%s' is missing " 1118 "save function\n", 1119 t->u.user.name); 1120 exit(1); 1121 } 1122 } 1123 } else if (target_name && (*target_name != '\0')) 1124 #ifdef IP6T_F_GOTO 1125 printf(" -%c %s", e->ipv6.flags & IP6T_F_GOTO ? 'g' : 'j', target_name); 1126 #else 1127 printf(" -j %s", target_name); 1128 #endif 1129 1130 printf("\n"); 1131 } 1132 1133 static int 1134 list_rules(const xt_chainlabel chain, int rulenum, int counters, 1135 struct xtc_handle *handle) 1136 { 1137 const char *this = NULL; 1138 int found = 0; 1139 1140 if (counters) 1141 counters = -1; /* iptables -c format */ 1142 1143 /* Dump out chain names first, 1144 * thereby preventing dependency conflicts */ 1145 if (!rulenum) for (this = ip6tc_first_chain(handle); 1146 this; 1147 this = ip6tc_next_chain(handle)) { 1148 if (chain && strcmp(this, chain) != 0) 1149 continue; 1150 1151 if (ip6tc_builtin(this, handle)) { 1152 struct xt_counters count; 1153 printf("-P %s %s", this, ip6tc_get_policy(this, &count, handle)); 1154 if (counters) 1155 printf(" -c %llu %llu", (unsigned long long)count.pcnt, (unsigned long long)count.bcnt); 1156 printf("\n"); 1157 } else { 1158 printf("-N %s\n", this); 1159 } 1160 } 1161 1162 for (this = ip6tc_first_chain(handle); 1163 this; 1164 this = ip6tc_next_chain(handle)) { 1165 const struct ip6t_entry *e; 1166 int num = 0; 1167 1168 if (chain && strcmp(this, chain) != 0) 1169 continue; 1170 1171 /* Dump out rules */ 1172 e = ip6tc_first_rule(this, handle); 1173 while(e) { 1174 num++; 1175 if (!rulenum || num == rulenum) 1176 print_rule6(e, handle, this, counters); 1177 e = ip6tc_next_rule(e, handle); 1178 } 1179 found = 1; 1180 } 1181 1182 errno = ENOENT; 1183 return found; 1184 } 1185 1186 static struct ip6t_entry * 1187 generate_entry(const struct ip6t_entry *fw, 1188 struct xtables_rule_match *matches, 1189 struct xt_entry_target *target) 1190 { 1191 unsigned int size; 1192 struct xtables_rule_match *matchp; 1193 struct ip6t_entry *e; 1194 1195 size = sizeof(struct ip6t_entry); 1196 for (matchp = matches; matchp; matchp = matchp->next) 1197 size += matchp->match->m->u.match_size; 1198 1199 e = xtables_malloc(size + target->u.target_size); 1200 *e = *fw; 1201 e->target_offset = size; 1202 e->next_offset = size + target->u.target_size; 1203 1204 size = 0; 1205 for (matchp = matches; matchp; matchp = matchp->next) { 1206 memcpy(e->elems + size, matchp->match->m, matchp->match->m->u.match_size); 1207 size += matchp->match->m->u.match_size; 1208 } 1209 memcpy(e->elems + size, target, target->u.target_size); 1210 1211 return e; 1212 } 1213 1214 static void command_jump(struct iptables_command_state *cs) 1215 { 1216 size_t size; 1217 1218 set_option(&cs->options, OPT_JUMP, &cs->fw6.ipv6.invflags, cs->invert); 1219 cs->jumpto = parse_target(optarg); 1220 /* TRY_LOAD (may be chain name) */ 1221 cs->target = xtables_find_target(cs->jumpto, XTF_TRY_LOAD); 1222 1223 if (cs->target == NULL) 1224 return; 1225 1226 size = XT_ALIGN(sizeof(struct xt_entry_target)) + cs->target->size; 1227 1228 cs->target->t = xtables_calloc(1, size); 1229 cs->target->t->u.target_size = size; 1230 if (cs->target->real_name == NULL) { 1231 strcpy(cs->target->t->u.user.name, cs->jumpto); 1232 } else { 1233 strcpy(cs->target->t->u.user.name, cs->target->real_name); 1234 if (!(cs->target->ext_flags & XTABLES_EXT_ALIAS)) 1235 fprintf(stderr, "Notice: The %s target is converted into %s target " 1236 "in rule listing and saving.\n", 1237 cs->jumpto, cs->target->real_name); 1238 } 1239 cs->target->t->u.user.revision = cs->target->revision; 1240 1241 xs_init_target(cs->target); 1242 if (cs->target->x6_options != NULL) 1243 opts = xtables_options_xfrm(ip6tables_globals.orig_opts, opts, 1244 cs->target->x6_options, 1245 &cs->target->option_offset); 1246 else 1247 opts = xtables_merge_options(ip6tables_globals.orig_opts, opts, 1248 cs->target->extra_opts, 1249 &cs->target->option_offset); 1250 if (opts == NULL) 1251 xtables_error(OTHER_PROBLEM, "can't alloc memory!"); 1252 } 1253 1254 static void command_match(struct iptables_command_state *cs) 1255 { 1256 struct xtables_match *m; 1257 size_t size; 1258 1259 if (cs->invert) 1260 xtables_error(PARAMETER_PROBLEM, 1261 "unexpected ! flag before --match"); 1262 1263 m = xtables_find_match(optarg, XTF_LOAD_MUST_SUCCEED, &cs->matches); 1264 size = XT_ALIGN(sizeof(struct xt_entry_match)) + m->size; 1265 m->m = xtables_calloc(1, size); 1266 m->m->u.match_size = size; 1267 if (m->real_name == NULL) { 1268 strcpy(m->m->u.user.name, m->name); 1269 } else { 1270 strcpy(m->m->u.user.name, m->real_name); 1271 if (!(m->ext_flags & XTABLES_EXT_ALIAS)) 1272 fprintf(stderr, "Notice: The %s match is converted into %s match " 1273 "in rule listing and saving.\n", m->name, m->real_name); 1274 } 1275 m->m->u.user.revision = m->revision; 1276 1277 xs_init_match(m); 1278 if (m == m->next) 1279 return; 1280 /* Merge options for non-cloned matches */ 1281 if (m->x6_options != NULL) 1282 opts = xtables_options_xfrm(ip6tables_globals.orig_opts, opts, 1283 m->x6_options, &m->option_offset); 1284 else if (m->extra_opts != NULL) 1285 opts = xtables_merge_options(ip6tables_globals.orig_opts, opts, 1286 m->extra_opts, &m->option_offset); 1287 } 1288 1289 int do_command6(int argc, char *argv[], char **table, 1290 struct xtc_handle **handle, bool restore) 1291 { 1292 struct iptables_command_state cs; 1293 struct ip6t_entry *e = NULL; 1294 unsigned int nsaddrs = 0, ndaddrs = 0; 1295 struct in6_addr *saddrs = NULL, *daddrs = NULL; 1296 struct in6_addr *smasks = NULL, *dmasks = NULL; 1297 1298 int verbose = 0; 1299 bool wait = false; 1300 const char *chain = NULL; 1301 const char *shostnetworkmask = NULL, *dhostnetworkmask = NULL; 1302 const char *policy = NULL, *newname = NULL; 1303 unsigned int rulenum = 0, command = 0; 1304 const char *pcnt = NULL, *bcnt = NULL; 1305 int ret = 1; 1306 struct xtables_match *m; 1307 struct xtables_rule_match *matchp; 1308 struct xtables_target *t; 1309 unsigned long long cnt; 1310 1311 memset(&cs, 0, sizeof(cs)); 1312 cs.jumpto = ""; 1313 cs.argv = argv; 1314 1315 /* re-set optind to 0 in case do_command6 gets called 1316 * a second time */ 1317 optind = 0; 1318 1319 /* clear mflags in case do_command6 gets called a second time 1320 * (we clear the global list of all matches for security)*/ 1321 for (m = xtables_matches; m; m = m->next) 1322 m->mflags = 0; 1323 1324 for (t = xtables_targets; t; t = t->next) { 1325 t->tflags = 0; 1326 t->used = 0; 1327 } 1328 1329 /* Suppress error messages: we may add new options if we 1330 demand-load a protocol. */ 1331 opterr = 0; 1332 1333 opts = xt_params->orig_opts; 1334 while ((cs.c = getopt_long(argc, argv, 1335 "-:A:C:D:R:I:L::S::M:F::Z::N:X::E:P:Vh::o:p:s:d:j:i:bvwnt:m:xc:g:46", 1336 opts, NULL)) != -1) { 1337 switch (cs.c) { 1338 /* 1339 * Command selection 1340 */ 1341 case 'A': 1342 add_command(&command, CMD_APPEND, CMD_NONE, 1343 cs.invert); 1344 chain = optarg; 1345 break; 1346 1347 case 'C': 1348 add_command(&command, CMD_CHECK, CMD_NONE, 1349 cs.invert); 1350 chain = optarg; 1351 break; 1352 1353 case 'D': 1354 add_command(&command, CMD_DELETE, CMD_NONE, 1355 cs.invert); 1356 chain = optarg; 1357 if (optind < argc && argv[optind][0] != '-' 1358 && argv[optind][0] != '!') { 1359 rulenum = parse_rulenumber(argv[optind++]); 1360 command = CMD_DELETE_NUM; 1361 } 1362 break; 1363 1364 case 'R': 1365 add_command(&command, CMD_REPLACE, CMD_NONE, 1366 cs.invert); 1367 chain = optarg; 1368 if (optind < argc && argv[optind][0] != '-' 1369 && argv[optind][0] != '!') 1370 rulenum = parse_rulenumber(argv[optind++]); 1371 else 1372 xtables_error(PARAMETER_PROBLEM, 1373 "-%c requires a rule number", 1374 cmd2char(CMD_REPLACE)); 1375 break; 1376 1377 case 'I': 1378 add_command(&command, CMD_INSERT, CMD_NONE, 1379 cs.invert); 1380 chain = optarg; 1381 if (optind < argc && argv[optind][0] != '-' 1382 && argv[optind][0] != '!') 1383 rulenum = parse_rulenumber(argv[optind++]); 1384 else rulenum = 1; 1385 break; 1386 1387 case 'L': 1388 add_command(&command, CMD_LIST, 1389 CMD_ZERO | CMD_ZERO_NUM, cs.invert); 1390 if (optarg) chain = optarg; 1391 else if (optind < argc && argv[optind][0] != '-' 1392 && argv[optind][0] != '!') 1393 chain = argv[optind++]; 1394 if (optind < argc && argv[optind][0] != '-' 1395 && argv[optind][0] != '!') 1396 rulenum = parse_rulenumber(argv[optind++]); 1397 break; 1398 1399 case 'S': 1400 add_command(&command, CMD_LIST_RULES, 1401 CMD_ZERO | CMD_ZERO_NUM, cs.invert); 1402 if (optarg) chain = optarg; 1403 else if (optind < argc && argv[optind][0] != '-' 1404 && argv[optind][0] != '!') 1405 chain = argv[optind++]; 1406 if (optind < argc && argv[optind][0] != '-' 1407 && argv[optind][0] != '!') 1408 rulenum = parse_rulenumber(argv[optind++]); 1409 break; 1410 1411 case 'F': 1412 add_command(&command, CMD_FLUSH, CMD_NONE, 1413 cs.invert); 1414 if (optarg) chain = optarg; 1415 else if (optind < argc && argv[optind][0] != '-' 1416 && argv[optind][0] != '!') 1417 chain = argv[optind++]; 1418 break; 1419 1420 case 'Z': 1421 add_command(&command, CMD_ZERO, CMD_LIST|CMD_LIST_RULES, 1422 cs.invert); 1423 if (optarg) chain = optarg; 1424 else if (optind < argc && argv[optind][0] != '-' 1425 && argv[optind][0] != '!') 1426 chain = argv[optind++]; 1427 if (optind < argc && argv[optind][0] != '-' 1428 && argv[optind][0] != '!') { 1429 rulenum = parse_rulenumber(argv[optind++]); 1430 command = CMD_ZERO_NUM; 1431 } 1432 break; 1433 1434 case 'N': 1435 if (optarg && (*optarg == '-' || *optarg == '!')) 1436 xtables_error(PARAMETER_PROBLEM, 1437 "chain name not allowed to start " 1438 "with `%c'\n", *optarg); 1439 if (xtables_find_target(optarg, XTF_TRY_LOAD)) 1440 xtables_error(PARAMETER_PROBLEM, 1441 "chain name may not clash " 1442 "with target name\n"); 1443 add_command(&command, CMD_NEW_CHAIN, CMD_NONE, 1444 cs.invert); 1445 chain = optarg; 1446 break; 1447 1448 case 'X': 1449 add_command(&command, CMD_DELETE_CHAIN, CMD_NONE, 1450 cs.invert); 1451 if (optarg) chain = optarg; 1452 else if (optind < argc && argv[optind][0] != '-' 1453 && argv[optind][0] != '!') 1454 chain = argv[optind++]; 1455 break; 1456 1457 case 'E': 1458 add_command(&command, CMD_RENAME_CHAIN, CMD_NONE, 1459 cs.invert); 1460 chain = optarg; 1461 if (optind < argc && argv[optind][0] != '-' 1462 && argv[optind][0] != '!') 1463 newname = argv[optind++]; 1464 else 1465 xtables_error(PARAMETER_PROBLEM, 1466 "-%c requires old-chain-name and " 1467 "new-chain-name", 1468 cmd2char(CMD_RENAME_CHAIN)); 1469 break; 1470 1471 case 'P': 1472 add_command(&command, CMD_SET_POLICY, CMD_NONE, 1473 cs.invert); 1474 chain = optarg; 1475 if (optind < argc && argv[optind][0] != '-' 1476 && argv[optind][0] != '!') 1477 policy = argv[optind++]; 1478 else 1479 xtables_error(PARAMETER_PROBLEM, 1480 "-%c requires a chain and a policy", 1481 cmd2char(CMD_SET_POLICY)); 1482 break; 1483 1484 case 'h': 1485 if (!optarg) 1486 optarg = argv[optind]; 1487 1488 /* ip6tables -p icmp -h */ 1489 if (!cs.matches && cs.protocol) 1490 xtables_find_match(cs.protocol, XTF_TRY_LOAD, 1491 &cs.matches); 1492 1493 exit_printhelp(cs.matches); 1494 1495 /* 1496 * Option selection 1497 */ 1498 case 'p': 1499 set_option(&cs.options, OPT_PROTOCOL, &cs.fw6.ipv6.invflags, 1500 cs.invert); 1501 1502 /* Canonicalize into lower case */ 1503 for (cs.protocol = optarg; *cs.protocol; cs.protocol++) 1504 *cs.protocol = tolower(*cs.protocol); 1505 1506 cs.protocol = optarg; 1507 cs.fw6.ipv6.proto = xtables_parse_protocol(cs.protocol); 1508 cs.fw6.ipv6.flags |= IP6T_F_PROTO; 1509 1510 if (cs.fw6.ipv6.proto == 0 1511 && (cs.fw6.ipv6.invflags & XT_INV_PROTO)) 1512 xtables_error(PARAMETER_PROBLEM, 1513 "rule would never match protocol"); 1514 1515 if (is_exthdr(cs.fw6.ipv6.proto) 1516 && (cs.fw6.ipv6.invflags & XT_INV_PROTO) == 0) 1517 fprintf(stderr, 1518 "Warning: never matched protocol: %s. " 1519 "use extension match instead.\n", 1520 cs.protocol); 1521 break; 1522 1523 case 's': 1524 set_option(&cs.options, OPT_SOURCE, &cs.fw6.ipv6.invflags, 1525 cs.invert); 1526 shostnetworkmask = optarg; 1527 break; 1528 1529 case 'd': 1530 set_option(&cs.options, OPT_DESTINATION, &cs.fw6.ipv6.invflags, 1531 cs.invert); 1532 dhostnetworkmask = optarg; 1533 break; 1534 1535 #ifdef IP6T_F_GOTO 1536 case 'g': 1537 set_option(&cs.options, OPT_JUMP, &cs.fw6.ipv6.invflags, 1538 cs.invert); 1539 cs.fw6.ipv6.flags |= IP6T_F_GOTO; 1540 cs.jumpto = parse_target(optarg); 1541 break; 1542 #endif 1543 1544 case 'j': 1545 command_jump(&cs); 1546 break; 1547 1548 1549 case 'i': 1550 if (*optarg == '\0') 1551 xtables_error(PARAMETER_PROBLEM, 1552 "Empty interface is likely to be " 1553 "undesired"); 1554 set_option(&cs.options, OPT_VIANAMEIN, &cs.fw6.ipv6.invflags, 1555 cs.invert); 1556 xtables_parse_interface(optarg, 1557 cs.fw6.ipv6.iniface, 1558 cs.fw6.ipv6.iniface_mask); 1559 break; 1560 1561 case 'o': 1562 if (*optarg == '\0') 1563 xtables_error(PARAMETER_PROBLEM, 1564 "Empty interface is likely to be " 1565 "undesired"); 1566 set_option(&cs.options, OPT_VIANAMEOUT, &cs.fw6.ipv6.invflags, 1567 cs.invert); 1568 xtables_parse_interface(optarg, 1569 cs.fw6.ipv6.outiface, 1570 cs.fw6.ipv6.outiface_mask); 1571 break; 1572 1573 case 'v': 1574 if (!verbose) 1575 set_option(&cs.options, OPT_VERBOSE, 1576 &cs.fw6.ipv6.invflags, cs.invert); 1577 verbose++; 1578 break; 1579 1580 case 'w': 1581 if (restore) { 1582 xtables_error(PARAMETER_PROBLEM, 1583 "You cannot use `-w' from " 1584 "ip6tables-restore"); 1585 } 1586 wait = true; 1587 break; 1588 1589 case 'm': 1590 command_match(&cs); 1591 break; 1592 1593 case 'n': 1594 set_option(&cs.options, OPT_NUMERIC, &cs.fw6.ipv6.invflags, 1595 cs.invert); 1596 break; 1597 1598 case 't': 1599 if (cs.invert) 1600 xtables_error(PARAMETER_PROBLEM, 1601 "unexpected ! flag before --table"); 1602 *table = optarg; 1603 break; 1604 1605 case 'x': 1606 set_option(&cs.options, OPT_EXPANDED, &cs.fw6.ipv6.invflags, 1607 cs.invert); 1608 break; 1609 1610 case 'V': 1611 if (cs.invert) 1612 printf("Not %s ;-)\n", prog_vers); 1613 else 1614 printf("%s v%s\n", 1615 prog_name, prog_vers); 1616 exit(0); 1617 1618 case '0': 1619 set_option(&cs.options, OPT_LINENUMBERS, &cs.fw6.ipv6.invflags, 1620 cs.invert); 1621 break; 1622 1623 case 'M': 1624 xtables_modprobe_program = optarg; 1625 break; 1626 1627 case 'c': 1628 1629 set_option(&cs.options, OPT_COUNTERS, &cs.fw6.ipv6.invflags, 1630 cs.invert); 1631 pcnt = optarg; 1632 bcnt = strchr(pcnt + 1, ','); 1633 if (bcnt) 1634 bcnt++; 1635 if (!bcnt && optind < argc && argv[optind][0] != '-' 1636 && argv[optind][0] != '!') 1637 bcnt = argv[optind++]; 1638 if (!bcnt) 1639 xtables_error(PARAMETER_PROBLEM, 1640 "-%c requires packet and byte counter", 1641 opt2char(OPT_COUNTERS)); 1642 1643 if (sscanf(pcnt, "%llu", &cnt) != 1) 1644 xtables_error(PARAMETER_PROBLEM, 1645 "-%c packet counter not numeric", 1646 opt2char(OPT_COUNTERS)); 1647 cs.fw6.counters.pcnt = cnt; 1648 1649 if (sscanf(bcnt, "%llu", &cnt) != 1) 1650 xtables_error(PARAMETER_PROBLEM, 1651 "-%c byte counter not numeric", 1652 opt2char(OPT_COUNTERS)); 1653 cs.fw6.counters.bcnt = cnt; 1654 break; 1655 1656 case '4': 1657 /* This is not the IPv4 iptables */ 1658 if (line != -1) 1659 return 1; /* success: line ignored */ 1660 fprintf(stderr, "This is the IPv6 version of ip6tables.\n"); 1661 exit_tryhelp(2); 1662 1663 case '6': 1664 /* This is indeed the IPv6 ip6tables */ 1665 break; 1666 1667 case 1: /* non option */ 1668 if (optarg[0] == '!' && optarg[1] == '\0') { 1669 if (cs.invert) 1670 xtables_error(PARAMETER_PROBLEM, 1671 "multiple consecutive ! not" 1672 " allowed"); 1673 cs.invert = TRUE; 1674 optarg[0] = '\0'; 1675 continue; 1676 } 1677 fprintf(stderr, "Bad argument `%s'\n", optarg); 1678 exit_tryhelp(2); 1679 1680 default: 1681 if (command_default(&cs, &ip6tables_globals) == 1) 1682 /* 1683 * If new options were loaded, we must retry 1684 * getopt immediately and not allow 1685 * cs.invert=FALSE to be executed. 1686 */ 1687 continue; 1688 break; 1689 } 1690 cs.invert = FALSE; 1691 } 1692 1693 for (matchp = cs.matches; matchp; matchp = matchp->next) 1694 xtables_option_mfcall(matchp->match); 1695 if (cs.target != NULL) 1696 xtables_option_tfcall(cs.target); 1697 1698 /* Fix me: must put inverse options checking here --MN */ 1699 1700 if (optind < argc) 1701 xtables_error(PARAMETER_PROBLEM, 1702 "unknown arguments found on commandline"); 1703 if (!command) 1704 xtables_error(PARAMETER_PROBLEM, "no command specified"); 1705 if (cs.invert) 1706 xtables_error(PARAMETER_PROBLEM, 1707 "nothing appropriate following !"); 1708 1709 if (command & (CMD_REPLACE | CMD_INSERT | CMD_DELETE | CMD_APPEND | CMD_CHECK)) { 1710 if (!(cs.options & OPT_DESTINATION)) 1711 dhostnetworkmask = "::0/0"; 1712 if (!(cs.options & OPT_SOURCE)) 1713 shostnetworkmask = "::0/0"; 1714 } 1715 1716 if (shostnetworkmask) 1717 xtables_ip6parse_multiple(shostnetworkmask, &saddrs, 1718 &smasks, &nsaddrs); 1719 1720 if (dhostnetworkmask) 1721 xtables_ip6parse_multiple(dhostnetworkmask, &daddrs, 1722 &dmasks, &ndaddrs); 1723 1724 if ((nsaddrs > 1 || ndaddrs > 1) && 1725 (cs.fw6.ipv6.invflags & (IP6T_INV_SRCIP | IP6T_INV_DSTIP))) 1726 xtables_error(PARAMETER_PROBLEM, "! not allowed with multiple" 1727 " source or destination IP addresses"); 1728 1729 if (command == CMD_REPLACE && (nsaddrs != 1 || ndaddrs != 1)) 1730 xtables_error(PARAMETER_PROBLEM, "Replacement rule does not " 1731 "specify a unique address"); 1732 1733 generic_opt_check(command, cs.options); 1734 1735 if (chain != NULL && strlen(chain) >= XT_EXTENSION_MAXNAMELEN) 1736 xtables_error(PARAMETER_PROBLEM, 1737 "chain name `%s' too long (must be under %u chars)", 1738 chain, XT_EXTENSION_MAXNAMELEN); 1739 1740 /* Attempt to acquire the xtables lock */ 1741 if (!restore && !xtables_lock(wait)) { 1742 fprintf(stderr, "Another app is currently holding the xtables lock. " 1743 "Perhaps you want to use the -w option?\n"); 1744 xtables_free_opts(1); 1745 exit(RESOURCE_PROBLEM); 1746 } 1747 1748 /* only allocate handle if we weren't called with a handle */ 1749 if (!*handle) 1750 *handle = ip6tc_init(*table); 1751 1752 /* try to insmod the module if iptc_init failed */ 1753 if (!*handle && xtables_load_ko(xtables_modprobe_program, false) != -1) 1754 *handle = ip6tc_init(*table); 1755 1756 if (!*handle) 1757 xtables_error(VERSION_PROBLEM, 1758 "can't initialize ip6tables table `%s': %s", 1759 *table, ip6tc_strerror(errno)); 1760 1761 if (command == CMD_APPEND 1762 || command == CMD_DELETE 1763 || command == CMD_CHECK 1764 || command == CMD_INSERT 1765 || command == CMD_REPLACE) { 1766 if (strcmp(chain, "PREROUTING") == 0 1767 || strcmp(chain, "INPUT") == 0) { 1768 /* -o not valid with incoming packets. */ 1769 if (cs.options & OPT_VIANAMEOUT) 1770 xtables_error(PARAMETER_PROBLEM, 1771 "Can't use -%c with %s\n", 1772 opt2char(OPT_VIANAMEOUT), 1773 chain); 1774 } 1775 1776 if (strcmp(chain, "POSTROUTING") == 0 1777 || strcmp(chain, "OUTPUT") == 0) { 1778 /* -i not valid with outgoing packets */ 1779 if (cs.options & OPT_VIANAMEIN) 1780 xtables_error(PARAMETER_PROBLEM, 1781 "Can't use -%c with %s\n", 1782 opt2char(OPT_VIANAMEIN), 1783 chain); 1784 } 1785 1786 if (cs.target && ip6tc_is_chain(cs.jumpto, *handle)) { 1787 fprintf(stderr, 1788 "Warning: using chain %s, not extension\n", 1789 cs.jumpto); 1790 1791 if (cs.target->t) 1792 free(cs.target->t); 1793 1794 cs.target = NULL; 1795 } 1796 1797 /* If they didn't specify a target, or it's a chain 1798 name, use standard. */ 1799 if (!cs.target 1800 && (strlen(cs.jumpto) == 0 1801 || ip6tc_is_chain(cs.jumpto, *handle))) { 1802 size_t size; 1803 1804 cs.target = xtables_find_target(XT_STANDARD_TARGET, 1805 XTF_LOAD_MUST_SUCCEED); 1806 1807 size = sizeof(struct xt_entry_target) 1808 + cs.target->size; 1809 cs.target->t = xtables_calloc(1, size); 1810 cs.target->t->u.target_size = size; 1811 strcpy(cs.target->t->u.user.name, cs.jumpto); 1812 xs_init_target(cs.target); 1813 } 1814 1815 if (!cs.target) { 1816 /* it is no chain, and we can't load a plugin. 1817 * We cannot know if the plugin is corrupt, non 1818 * existant OR if the user just misspelled a 1819 * chain. */ 1820 #ifdef IP6T_F_GOTO 1821 if (cs.fw6.ipv6.flags & IP6T_F_GOTO) 1822 xtables_error(PARAMETER_PROBLEM, 1823 "goto '%s' is not a chain\n", 1824 cs.jumpto); 1825 #endif 1826 xtables_find_target(cs.jumpto, XTF_LOAD_MUST_SUCCEED); 1827 } else { 1828 e = generate_entry(&cs.fw6, cs.matches, cs.target->t); 1829 free(cs.target->t); 1830 } 1831 } 1832 1833 switch (command) { 1834 case CMD_APPEND: 1835 ret = append_entry(chain, e, 1836 nsaddrs, saddrs, smasks, 1837 ndaddrs, daddrs, dmasks, 1838 cs.options&OPT_VERBOSE, 1839 *handle); 1840 break; 1841 case CMD_DELETE: 1842 ret = delete_entry(chain, e, 1843 nsaddrs, saddrs, smasks, 1844 ndaddrs, daddrs, dmasks, 1845 cs.options&OPT_VERBOSE, 1846 *handle, cs.matches, cs.target); 1847 break; 1848 case CMD_DELETE_NUM: 1849 ret = ip6tc_delete_num_entry(chain, rulenum - 1, *handle); 1850 break; 1851 case CMD_CHECK: 1852 ret = check_entry(chain, e, 1853 nsaddrs, saddrs, smasks, 1854 ndaddrs, daddrs, dmasks, 1855 cs.options&OPT_VERBOSE, 1856 *handle, cs.matches, cs.target); 1857 break; 1858 case CMD_REPLACE: 1859 ret = replace_entry(chain, e, rulenum - 1, 1860 saddrs, smasks, daddrs, dmasks, 1861 cs.options&OPT_VERBOSE, *handle); 1862 break; 1863 case CMD_INSERT: 1864 ret = insert_entry(chain, e, rulenum - 1, 1865 nsaddrs, saddrs, smasks, 1866 ndaddrs, daddrs, dmasks, 1867 cs.options&OPT_VERBOSE, 1868 *handle); 1869 break; 1870 case CMD_FLUSH: 1871 ret = flush_entries6(chain, cs.options&OPT_VERBOSE, *handle); 1872 break; 1873 case CMD_ZERO: 1874 ret = zero_entries(chain, cs.options&OPT_VERBOSE, *handle); 1875 break; 1876 case CMD_ZERO_NUM: 1877 ret = ip6tc_zero_counter(chain, rulenum, *handle); 1878 break; 1879 case CMD_LIST: 1880 case CMD_LIST|CMD_ZERO: 1881 case CMD_LIST|CMD_ZERO_NUM: 1882 ret = list_entries(chain, 1883 rulenum, 1884 cs.options&OPT_VERBOSE, 1885 cs.options&OPT_NUMERIC, 1886 cs.options&OPT_EXPANDED, 1887 cs.options&OPT_LINENUMBERS, 1888 *handle); 1889 if (ret && (command & CMD_ZERO)) 1890 ret = zero_entries(chain, 1891 cs.options&OPT_VERBOSE, *handle); 1892 if (ret && (command & CMD_ZERO_NUM)) 1893 ret = ip6tc_zero_counter(chain, rulenum, *handle); 1894 break; 1895 case CMD_LIST_RULES: 1896 case CMD_LIST_RULES|CMD_ZERO: 1897 case CMD_LIST_RULES|CMD_ZERO_NUM: 1898 ret = list_rules(chain, 1899 rulenum, 1900 cs.options&OPT_VERBOSE, 1901 *handle); 1902 if (ret && (command & CMD_ZERO)) 1903 ret = zero_entries(chain, 1904 cs.options&OPT_VERBOSE, *handle); 1905 if (ret && (command & CMD_ZERO_NUM)) 1906 ret = ip6tc_zero_counter(chain, rulenum, *handle); 1907 break; 1908 case CMD_NEW_CHAIN: 1909 ret = ip6tc_create_chain(chain, *handle); 1910 break; 1911 case CMD_DELETE_CHAIN: 1912 ret = delete_chain6(chain, cs.options&OPT_VERBOSE, *handle); 1913 break; 1914 case CMD_RENAME_CHAIN: 1915 ret = ip6tc_rename_chain(chain, newname, *handle); 1916 break; 1917 case CMD_SET_POLICY: 1918 ret = ip6tc_set_policy(chain, policy, cs.options&OPT_COUNTERS ? &cs.fw6.counters : NULL, *handle); 1919 break; 1920 default: 1921 /* We should never reach this... */ 1922 exit_tryhelp(2); 1923 } 1924 1925 if (verbose > 1) 1926 dump_entries6(*handle); 1927 1928 xtables_rule_matches_free(&cs.matches); 1929 1930 if (e != NULL) { 1931 free(e); 1932 e = NULL; 1933 } 1934 1935 free(saddrs); 1936 free(smasks); 1937 free(daddrs); 1938 free(dmasks); 1939 xtables_free_opts(1); 1940 1941 return ret; 1942 } 1943
