ip6tables.c revision d1e7922a587a239e16e0dbe654e63f76e1375e49
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 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 FMT_NUMERIC 0x0001 56#define FMT_NOCOUNTS 0x0002 57#define FMT_KILOMEGAGIGA 0x0004 58#define FMT_OPTIONS 0x0008 59#define FMT_NOTABLE 0x0010 60#define FMT_NOTARGET 0x0020 61#define FMT_VIA 0x0040 62#define FMT_NONEWLINE 0x0080 63#define FMT_LINENUMBERS 0x0100 64 65#define FMT_PRINT_RULE (FMT_NOCOUNTS | FMT_OPTIONS | FMT_VIA \ 66 | FMT_NUMERIC | FMT_NOTABLE) 67#define FMT(tab,notab) ((format) & FMT_NOTABLE ? (notab) : (tab)) 68 69 70#define CMD_NONE 0x0000U 71#define CMD_INSERT 0x0001U 72#define CMD_DELETE 0x0002U 73#define CMD_DELETE_NUM 0x0004U 74#define CMD_REPLACE 0x0008U 75#define CMD_APPEND 0x0010U 76#define CMD_LIST 0x0020U 77#define CMD_FLUSH 0x0040U 78#define CMD_ZERO 0x0080U 79#define CMD_NEW_CHAIN 0x0100U 80#define CMD_DELETE_CHAIN 0x0200U 81#define CMD_SET_POLICY 0x0400U 82#define CMD_RENAME_CHAIN 0x0800U 83#define CMD_LIST_RULES 0x1000U 84#define CMD_ZERO_NUM 0x2000U 85#define CMD_CHECK 0x4000U 86#define NUMBER_OF_CMD 16 87static const char cmdflags[] = { 'I', 'D', 'D', 'R', 'A', 'L', 'F', 'Z', 88 'N', 'X', 'P', 'E', 'S', 'Z', 'C' }; 89 90#define NUMBER_OF_OPT ARRAY_SIZE(optflags) 91static const char optflags[] 92= { 'n', 's', 'd', 'p', 'j', 'v', 'x', 'i', 'o', '0', 'c'}; 93 94static struct option original_opts[] = { 95 {.name = "append", .has_arg = 1, .val = 'A'}, 96 {.name = "delete", .has_arg = 1, .val = 'D'}, 97 {.name = "check" , .has_arg = 1, .val = 'C'}, 98 {.name = "insert", .has_arg = 1, .val = 'I'}, 99 {.name = "replace", .has_arg = 1, .val = 'R'}, 100 {.name = "list", .has_arg = 2, .val = 'L'}, 101 {.name = "list-rules", .has_arg = 2, .val = 'S'}, 102 {.name = "flush", .has_arg = 2, .val = 'F'}, 103 {.name = "zero", .has_arg = 2, .val = 'Z'}, 104 {.name = "new-chain", .has_arg = 1, .val = 'N'}, 105 {.name = "delete-chain", .has_arg = 2, .val = 'X'}, 106 {.name = "rename-chain", .has_arg = 1, .val = 'E'}, 107 {.name = "policy", .has_arg = 1, .val = 'P'}, 108 {.name = "source", .has_arg = 1, .val = 's'}, 109 {.name = "destination", .has_arg = 1, .val = 'd'}, 110 {.name = "src", .has_arg = 1, .val = 's'}, /* synonym */ 111 {.name = "dst", .has_arg = 1, .val = 'd'}, /* synonym */ 112 {.name = "protocol", .has_arg = 1, .val = 'p'}, 113 {.name = "in-interface", .has_arg = 1, .val = 'i'}, 114 {.name = "jump", .has_arg = 1, .val = 'j'}, 115 {.name = "table", .has_arg = 1, .val = 't'}, 116 {.name = "match", .has_arg = 1, .val = 'm'}, 117 {.name = "numeric", .has_arg = 0, .val = 'n'}, 118 {.name = "out-interface", .has_arg = 1, .val = 'o'}, 119 {.name = "verbose", .has_arg = 0, .val = 'v'}, 120 {.name = "exact", .has_arg = 0, .val = 'x'}, 121 {.name = "version", .has_arg = 0, .val = 'V'}, 122 {.name = "help", .has_arg = 2, .val = 'h'}, 123 {.name = "line-numbers", .has_arg = 0, .val = '0'}, 124 {.name = "modprobe", .has_arg = 1, .val = 'M'}, 125 {.name = "set-counters", .has_arg = 1, .val = 'c'}, 126 {.name = "goto", .has_arg = 1, .val = 'g'}, 127 {.name = "ipv4", .has_arg = 0, .val = '4'}, 128 {.name = "ipv6", .has_arg = 0, .val = '6'}, 129 {NULL}, 130}; 131 132void ip6tables_exit_error(enum xtables_exittype status, const char *msg, ...) __attribute__((noreturn, format(printf,2,3))); 133struct xtables_globals ip6tables_globals = { 134 .option_offset = 0, 135 .program_version = IPTABLES_VERSION, 136 .orig_opts = original_opts, 137 .exit_err = ip6tables_exit_error, 138}; 139 140/* Table of legal combinations of commands and options. If any of the 141 * given commands make an option legal, that option is legal (applies to 142 * CMD_LIST and CMD_ZERO only). 143 * Key: 144 * + compulsory 145 * x illegal 146 * optional 147 */ 148 149static const char commands_v_options[NUMBER_OF_CMD][NUMBER_OF_OPT] = 150/* Well, it's better than "Re: Linux vs FreeBSD" */ 151{ 152 /* -n -s -d -p -j -v -x -i -o --line -c */ 153/*INSERT*/ {'x',' ',' ',' ',' ',' ','x',' ',' ','x',' '}, 154/*DELETE*/ {'x',' ',' ',' ',' ',' ','x',' ',' ','x','x'}, 155/*DELETE_NUM*/{'x','x','x','x','x',' ','x','x','x','x','x'}, 156/*REPLACE*/ {'x',' ',' ',' ',' ',' ','x',' ',' ','x',' '}, 157/*APPEND*/ {'x',' ',' ',' ',' ',' ','x',' ',' ','x',' '}, 158/*LIST*/ {' ','x','x','x','x',' ',' ','x','x',' ','x'}, 159/*FLUSH*/ {'x','x','x','x','x',' ','x','x','x','x','x'}, 160/*ZERO*/ {'x','x','x','x','x',' ','x','x','x','x','x'}, 161/*ZERO_NUM*/ {'x','x','x','x','x',' ','x','x','x','x','x'}, 162/*NEW_CHAIN*/ {'x','x','x','x','x',' ','x','x','x','x','x'}, 163/*DEL_CHAIN*/ {'x','x','x','x','x',' ','x','x','x','x','x'}, 164/*SET_POLICY*/{'x','x','x','x','x',' ','x','x','x','x',' '}, 165/*RENAME*/ {'x','x','x','x','x',' ','x','x','x','x','x'}, 166/*LIST_RULES*/{'x','x','x','x','x',' ','x','x','x','x','x'}, 167/*CHECK*/ {'x',' ',' ',' ',' ',' ','x',' ',' ','x','x'}, 168}; 169 170static const unsigned int inverse_for_options[NUMBER_OF_OPT] = 171{ 172/* -n */ 0, 173/* -s */ IP6T_INV_SRCIP, 174/* -d */ IP6T_INV_DSTIP, 175/* -p */ XT_INV_PROTO, 176/* -j */ 0, 177/* -v */ 0, 178/* -x */ 0, 179/* -i */ IP6T_INV_VIA_IN, 180/* -o */ IP6T_INV_VIA_OUT, 181/*--line*/ 0, 182/* -c */ 0, 183}; 184 185#define opts ip6tables_globals.opts 186#define prog_name ip6tables_globals.program_name 187#define prog_vers ip6tables_globals.program_version 188/* A few hardcoded protocols for 'all' and in case the user has no 189 /etc/protocols */ 190struct pprot { 191 const char *name; 192 uint8_t num; 193}; 194 195static void __attribute__((noreturn)) 196exit_tryhelp(int status) 197{ 198 if (line != -1) 199 fprintf(stderr, "Error occurred at line: %d\n", line); 200 fprintf(stderr, "Try `%s -h' or '%s --help' for more information.\n", 201 prog_name, prog_name); 202 xtables_free_opts(1); 203 exit(status); 204} 205 206static void 207exit_printhelp(const struct xtables_rule_match *matches) 208{ 209 printf("%s v%s\n\n" 210"Usage: %s -[ACD] chain rule-specification [options]\n" 211" %s -I chain [rulenum] rule-specification [options]\n" 212" %s -R chain rulenum rule-specification [options]\n" 213" %s -D chain rulenum [options]\n" 214" %s -[LS] [chain [rulenum]] [options]\n" 215" %s -[FZ] [chain] [options]\n" 216" %s -[NX] chain\n" 217" %s -E old-chain-name new-chain-name\n" 218" %s -P chain target [options]\n" 219" %s -h (print this help information)\n\n", 220 prog_name, prog_vers, prog_name, prog_name, 221 prog_name, prog_name, prog_name, prog_name, 222 prog_name, prog_name, prog_name, prog_name); 223 224 printf( 225"Commands:\n" 226"Either long or short options are allowed.\n" 227" --append -A chain Append to chain\n" 228" --check -C chain Check for the existence of a rule\n" 229" --delete -D chain Delete matching rule from chain\n" 230" --delete -D chain rulenum\n" 231" Delete rule rulenum (1 = first) from chain\n" 232" --insert -I chain [rulenum]\n" 233" Insert in chain as rulenum (default 1=first)\n" 234" --replace -R chain rulenum\n" 235" Replace rule rulenum (1 = first) in chain\n" 236" --list -L [chain [rulenum]]\n" 237" List the rules in a chain or all chains\n" 238" --list-rules -S [chain [rulenum]]\n" 239" Print the rules in a chain or all chains\n" 240" --flush -F [chain] Delete all rules in chain or all chains\n" 241" --zero -Z [chain [rulenum]]\n" 242" Zero counters in chain or all chains\n" 243" --new -N chain Create a new user-defined chain\n" 244" --delete-chain\n" 245" -X [chain] Delete a user-defined chain\n" 246" --policy -P chain target\n" 247" Change policy on chain to target\n" 248" --rename-chain\n" 249" -E old-chain new-chain\n" 250" Change chain name, (moving any references)\n" 251 252"Options:\n" 253" --ipv4 -4 Error (line is ignored by ip6tables-restore)\n" 254" --ipv6 -6 Nothing (line is ignored by iptables-restore)\n" 255"[!] --proto -p proto protocol: by number or name, eg. `tcp'\n" 256"[!] --source -s address[/mask][,...]\n" 257" source specification\n" 258"[!] --destination -d address[/mask][,...]\n" 259" destination specification\n" 260"[!] --in-interface -i input name[+]\n" 261" network interface name ([+] for wildcard)\n" 262" --jump -j target\n" 263" target for rule (may load target extension)\n" 264#ifdef IP6T_F_GOTO 265" --goto -g chain\n" 266" jump to chain with no return\n" 267#endif 268" --match -m match\n" 269" extended match (may load extension)\n" 270" --numeric -n numeric output of addresses and ports\n" 271"[!] --out-interface -o output name[+]\n" 272" network interface name ([+] for wildcard)\n" 273" --table -t table table to manipulate (default: `filter')\n" 274" --verbose -v verbose mode\n" 275" --line-numbers print line numbers when listing\n" 276" --exact -x expand numbers (display exact values)\n" 277/*"[!] --fragment -f match second or further fragments only\n"*/ 278" --modprobe=<command> try to insert modules using this command\n" 279" --set-counters PKTS BYTES set the counter during insert/append\n" 280"[!] --version -V print package version.\n"); 281 282 print_extension_helps(xtables_targets, matches); 283 exit(0); 284} 285 286void 287ip6tables_exit_error(enum xtables_exittype status, const char *msg, ...) 288{ 289 va_list args; 290 291 va_start(args, msg); 292 fprintf(stderr, "%s v%s: ", prog_name, prog_vers); 293 vfprintf(stderr, msg, args); 294 va_end(args); 295 fprintf(stderr, "\n"); 296 if (status == PARAMETER_PROBLEM) 297 exit_tryhelp(status); 298 if (status == VERSION_PROBLEM) 299 fprintf(stderr, 300 "Perhaps ip6tables or your kernel needs to be upgraded.\n"); 301 /* On error paths, make sure that we don't leak memory */ 302 xtables_free_opts(1); 303 exit(status); 304} 305 306static void 307generic_opt_check(int command, int options) 308{ 309 int i, j, legal = 0; 310 311 /* Check that commands are valid with options. Complicated by the 312 * fact that if an option is legal with *any* command given, it is 313 * legal overall (ie. -z and -l). 314 */ 315 for (i = 0; i < NUMBER_OF_OPT; i++) { 316 legal = 0; /* -1 => illegal, 1 => legal, 0 => undecided. */ 317 318 for (j = 0; j < NUMBER_OF_CMD; j++) { 319 if (!(command & (1<<j))) 320 continue; 321 322 if (!(options & (1<<i))) { 323 if (commands_v_options[j][i] == '+') 324 xtables_error(PARAMETER_PROBLEM, 325 "You need to supply the `-%c' " 326 "option for this command\n", 327 optflags[i]); 328 } else { 329 if (commands_v_options[j][i] != 'x') 330 legal = 1; 331 else if (legal == 0) 332 legal = -1; 333 } 334 } 335 if (legal == -1) 336 xtables_error(PARAMETER_PROBLEM, 337 "Illegal option `-%c' with this command\n", 338 optflags[i]); 339 } 340} 341 342static char 343opt2char(int option) 344{ 345 const char *ptr; 346 for (ptr = optflags; option > 1; option >>= 1, ptr++); 347 348 return *ptr; 349} 350 351static char 352cmd2char(int option) 353{ 354 const char *ptr; 355 for (ptr = cmdflags; option > 1; option >>= 1, ptr++); 356 357 return *ptr; 358} 359 360static void 361add_command(unsigned int *cmd, const int newcmd, const int othercmds, 362 int invert) 363{ 364 if (invert) 365 xtables_error(PARAMETER_PROBLEM, "unexpected '!' flag"); 366 if (*cmd & (~othercmds)) 367 xtables_error(PARAMETER_PROBLEM, "Cannot use -%c with -%c\n", 368 cmd2char(newcmd), cmd2char(*cmd & (~othercmds))); 369 *cmd |= newcmd; 370} 371 372/* 373 * All functions starting with "parse" should succeed, otherwise 374 * the program fails. 375 * Most routines return pointers to static data that may change 376 * between calls to the same or other routines with a few exceptions: 377 * "host_to_addr", "parse_hostnetwork", and "parse_hostnetworkmask" 378 * return global static data. 379*/ 380 381/* These are invalid numbers as upper layer protocol */ 382static int is_exthdr(uint16_t proto) 383{ 384 return (proto == IPPROTO_ROUTING || 385 proto == IPPROTO_FRAGMENT || 386 proto == IPPROTO_AH || 387 proto == IPPROTO_DSTOPTS); 388} 389 390/* Can't be zero. */ 391static int 392parse_rulenumber(const char *rule) 393{ 394 unsigned int rulenum; 395 396 if (!xtables_strtoui(rule, NULL, &rulenum, 1, INT_MAX)) 397 xtables_error(PARAMETER_PROBLEM, 398 "Invalid rule number `%s'", rule); 399 400 return rulenum; 401} 402 403static const char * 404parse_target(const char *targetname) 405{ 406 const char *ptr; 407 408 if (strlen(targetname) < 1) 409 xtables_error(PARAMETER_PROBLEM, 410 "Invalid target name (too short)"); 411 412 if (strlen(targetname) >= XT_EXTENSION_MAXNAMELEN) 413 xtables_error(PARAMETER_PROBLEM, 414 "Invalid target name `%s' (%u chars max)", 415 targetname, XT_EXTENSION_MAXNAMELEN - 1); 416 417 for (ptr = targetname; *ptr; ptr++) 418 if (isspace(*ptr)) 419 xtables_error(PARAMETER_PROBLEM, 420 "Invalid target name `%s'", targetname); 421 return targetname; 422} 423 424static void 425set_option(unsigned int *options, unsigned int option, uint8_t *invflg, 426 int invert) 427{ 428 if (*options & option) 429 xtables_error(PARAMETER_PROBLEM, "multiple -%c flags not allowed", 430 opt2char(option)); 431 *options |= option; 432 433 if (invert) { 434 unsigned int i; 435 for (i = 0; 1 << i != option; i++); 436 437 if (!inverse_for_options[i]) 438 xtables_error(PARAMETER_PROBLEM, 439 "cannot have ! before -%c", 440 opt2char(option)); 441 *invflg |= inverse_for_options[i]; 442 } 443} 444 445static void 446print_num(uint64_t number, unsigned int format) 447{ 448 if (format & FMT_KILOMEGAGIGA) { 449 if (number > 99999) { 450 number = (number + 500) / 1000; 451 if (number > 9999) { 452 number = (number + 500) / 1000; 453 if (number > 9999) { 454 number = (number + 500) / 1000; 455 if (number > 9999) { 456 number = (number + 500) / 1000; 457 printf(FMT("%4lluT ","%lluT "), (unsigned long long)number); 458 } 459 else printf(FMT("%4lluG ","%lluG "), (unsigned long long)number); 460 } 461 else printf(FMT("%4lluM ","%lluM "), (unsigned long long)number); 462 } else 463 printf(FMT("%4lluK ","%lluK "), (unsigned long long)number); 464 } else 465 printf(FMT("%5llu ","%llu "), (unsigned long long)number); 466 } else 467 printf(FMT("%8llu ","%llu "), (unsigned long long)number); 468} 469 470 471static void 472print_header(unsigned int format, const char *chain, struct xtc_handle *handle) 473{ 474 struct xt_counters counters; 475 const char *pol = ip6tc_get_policy(chain, &counters, handle); 476 printf("Chain %s", chain); 477 if (pol) { 478 printf(" (policy %s", pol); 479 if (!(format & FMT_NOCOUNTS)) { 480 fputc(' ', stdout); 481 print_num(counters.pcnt, (format|FMT_NOTABLE)); 482 fputs("packets, ", stdout); 483 print_num(counters.bcnt, (format|FMT_NOTABLE)); 484 fputs("bytes", stdout); 485 } 486 printf(")\n"); 487 } else { 488 unsigned int refs; 489 if (!ip6tc_get_references(&refs, chain, handle)) 490 printf(" (ERROR obtaining refs)\n"); 491 else 492 printf(" (%u references)\n", refs); 493 } 494 495 if (format & FMT_LINENUMBERS) 496 printf(FMT("%-4s ", "%s "), "num"); 497 if (!(format & FMT_NOCOUNTS)) { 498 if (format & FMT_KILOMEGAGIGA) { 499 printf(FMT("%5s ","%s "), "pkts"); 500 printf(FMT("%5s ","%s "), "bytes"); 501 } else { 502 printf(FMT("%8s ","%s "), "pkts"); 503 printf(FMT("%10s ","%s "), "bytes"); 504 } 505 } 506 if (!(format & FMT_NOTARGET)) 507 printf(FMT("%-9s ","%s "), "target"); 508 fputs(" prot ", stdout); 509 if (format & FMT_OPTIONS) 510 fputs("opt", stdout); 511 if (format & FMT_VIA) { 512 printf(FMT(" %-6s ","%s "), "in"); 513 printf(FMT("%-6s ","%s "), "out"); 514 } 515 printf(FMT(" %-19s ","%s "), "source"); 516 printf(FMT(" %-19s "," %s "), "destination"); 517 printf("\n"); 518} 519 520 521static int 522print_match(const struct xt_entry_match *m, 523 const struct ip6t_ip6 *ip, 524 int numeric) 525{ 526 const struct xtables_match *match = 527 xtables_find_match(m->u.user.name, XTF_TRY_LOAD, NULL); 528 529 if (match) { 530 if (match->print) 531 match->print(ip, m, numeric); 532 else 533 printf("%s ", match->name); 534 } else { 535 if (m->u.user.name[0]) 536 printf("UNKNOWN match `%s' ", m->u.user.name); 537 } 538 /* Don't stop iterating. */ 539 return 0; 540} 541 542/* e is called `fw' here for historical reasons */ 543static void 544print_firewall(const struct ip6t_entry *fw, 545 const char *targname, 546 unsigned int num, 547 unsigned int format, 548 struct xtc_handle *const handle) 549{ 550 const struct xtables_target *target = NULL; 551 const struct xt_entry_target *t; 552 char buf[BUFSIZ]; 553 554 if (!ip6tc_is_chain(targname, handle)) 555 target = xtables_find_target(targname, XTF_TRY_LOAD); 556 else 557 target = xtables_find_target(XT_STANDARD_TARGET, 558 XTF_LOAD_MUST_SUCCEED); 559 560 t = ip6t_get_target((struct ip6t_entry *)fw); 561 562 if (format & FMT_LINENUMBERS) 563 printf(FMT("%-4u ", "%u "), num); 564 565 if (!(format & FMT_NOCOUNTS)) { 566 print_num(fw->counters.pcnt, format); 567 print_num(fw->counters.bcnt, format); 568 } 569 570 if (!(format & FMT_NOTARGET)) 571 printf(FMT("%-9s ", "%s "), targname); 572 573 fputc(fw->ipv6.invflags & XT_INV_PROTO ? '!' : ' ', stdout); 574 { 575 const char *pname = proto_to_name(fw->ipv6.proto, format&FMT_NUMERIC); 576 if (pname) 577 printf(FMT("%-5s", "%s "), pname); 578 else 579 printf(FMT("%-5hu", "%hu "), fw->ipv6.proto); 580 } 581 582 if (format & FMT_OPTIONS) { 583 if (format & FMT_NOTABLE) 584 fputs("opt ", stdout); 585 fputc(' ', stdout); /* Invert flag of FRAG */ 586 fputc(' ', stdout); /* -f */ 587 fputc(' ', stdout); 588 } 589 590 if (format & FMT_VIA) { 591 char iface[IFNAMSIZ+2]; 592 593 if (fw->ipv6.invflags & IP6T_INV_VIA_IN) { 594 iface[0] = '!'; 595 iface[1] = '\0'; 596 } 597 else iface[0] = '\0'; 598 599 if (fw->ipv6.iniface[0] != '\0') { 600 strcat(iface, fw->ipv6.iniface); 601 } 602 else if (format & FMT_NUMERIC) strcat(iface, "*"); 603 else strcat(iface, "any"); 604 printf(FMT(" %-6s ","in %s "), iface); 605 606 if (fw->ipv6.invflags & IP6T_INV_VIA_OUT) { 607 iface[0] = '!'; 608 iface[1] = '\0'; 609 } 610 else iface[0] = '\0'; 611 612 if (fw->ipv6.outiface[0] != '\0') { 613 strcat(iface, fw->ipv6.outiface); 614 } 615 else if (format & FMT_NUMERIC) strcat(iface, "*"); 616 else strcat(iface, "any"); 617 printf(FMT("%-6s ","out %s "), iface); 618 } 619 620 fputc(fw->ipv6.invflags & IP6T_INV_SRCIP ? '!' : ' ', stdout); 621 if (!memcmp(&fw->ipv6.smsk, &in6addr_any, sizeof in6addr_any) 622 && !(format & FMT_NUMERIC)) 623 printf(FMT("%-19s ","%s "), "anywhere"); 624 else { 625 if (format & FMT_NUMERIC) 626 strcpy(buf, xtables_ip6addr_to_numeric(&fw->ipv6.src)); 627 else 628 strcpy(buf, xtables_ip6addr_to_anyname(&fw->ipv6.src)); 629 strcat(buf, xtables_ip6mask_to_numeric(&fw->ipv6.smsk)); 630 printf(FMT("%-19s ","%s "), buf); 631 } 632 633 fputc(fw->ipv6.invflags & IP6T_INV_DSTIP ? '!' : ' ', stdout); 634 if (!memcmp(&fw->ipv6.dmsk, &in6addr_any, sizeof in6addr_any) 635 && !(format & FMT_NUMERIC)) 636 printf(FMT("%-19s ","-> %s"), "anywhere"); 637 else { 638 if (format & FMT_NUMERIC) 639 strcpy(buf, xtables_ip6addr_to_numeric(&fw->ipv6.dst)); 640 else 641 strcpy(buf, xtables_ip6addr_to_anyname(&fw->ipv6.dst)); 642 strcat(buf, xtables_ip6mask_to_numeric(&fw->ipv6.dmsk)); 643 printf(FMT("%-19s ","-> %s"), buf); 644 } 645 646 if (format & FMT_NOTABLE) 647 fputs(" ", stdout); 648 649#ifdef IP6T_F_GOTO 650 if(fw->ipv6.flags & IP6T_F_GOTO) 651 printf("[goto] "); 652#endif 653 654 IP6T_MATCH_ITERATE(fw, print_match, &fw->ipv6, format & FMT_NUMERIC); 655 656 if (target) { 657 if (target->print) 658 /* Print the target information. */ 659 target->print(&fw->ipv6, t, format & FMT_NUMERIC); 660 } else if (t->u.target_size != sizeof(*t)) 661 printf("[%u bytes of unknown target data] ", 662 (unsigned int)(t->u.target_size - sizeof(*t))); 663 664 if (!(format & FMT_NONEWLINE)) 665 fputc('\n', stdout); 666} 667 668static void 669print_firewall_line(const struct ip6t_entry *fw, 670 struct xtc_handle *const h) 671{ 672 struct xt_entry_target *t; 673 674 t = ip6t_get_target((struct ip6t_entry *)fw); 675 print_firewall(fw, t->u.user.name, 0, FMT_PRINT_RULE, h); 676} 677 678static int 679append_entry(const xt_chainlabel chain, 680 struct ip6t_entry *fw, 681 unsigned int nsaddrs, 682 const struct in6_addr saddrs[], 683 const struct in6_addr smasks[], 684 unsigned int ndaddrs, 685 const struct in6_addr daddrs[], 686 const struct in6_addr dmasks[], 687 int verbose, 688 struct xtc_handle *handle) 689{ 690 unsigned int i, j; 691 int ret = 1; 692 693 for (i = 0; i < nsaddrs; i++) { 694 fw->ipv6.src = saddrs[i]; 695 fw->ipv6.smsk = smasks[i]; 696 for (j = 0; j < ndaddrs; j++) { 697 fw->ipv6.dst = daddrs[j]; 698 fw->ipv6.dmsk = dmasks[j]; 699 if (verbose) 700 print_firewall_line(fw, handle); 701 ret &= ip6tc_append_entry(chain, fw, handle); 702 } 703 } 704 705 return ret; 706} 707 708static int 709replace_entry(const xt_chainlabel chain, 710 struct ip6t_entry *fw, 711 unsigned int rulenum, 712 const struct in6_addr *saddr, const struct in6_addr *smask, 713 const struct in6_addr *daddr, const struct in6_addr *dmask, 714 int verbose, 715 struct xtc_handle *handle) 716{ 717 fw->ipv6.src = *saddr; 718 fw->ipv6.dst = *daddr; 719 fw->ipv6.smsk = *smask; 720 fw->ipv6.dmsk = *dmask; 721 722 if (verbose) 723 print_firewall_line(fw, handle); 724 return ip6tc_replace_entry(chain, fw, rulenum, handle); 725} 726 727static int 728insert_entry(const xt_chainlabel chain, 729 struct ip6t_entry *fw, 730 unsigned int rulenum, 731 unsigned int nsaddrs, 732 const struct in6_addr saddrs[], 733 const struct in6_addr smasks[], 734 unsigned int ndaddrs, 735 const struct in6_addr daddrs[], 736 const struct in6_addr dmasks[], 737 int verbose, 738 struct xtc_handle *handle) 739{ 740 unsigned int i, j; 741 int ret = 1; 742 743 for (i = 0; i < nsaddrs; i++) { 744 fw->ipv6.src = saddrs[i]; 745 fw->ipv6.smsk = smasks[i]; 746 for (j = 0; j < ndaddrs; j++) { 747 fw->ipv6.dst = daddrs[j]; 748 fw->ipv6.dmsk = dmasks[j]; 749 if (verbose) 750 print_firewall_line(fw, handle); 751 ret &= ip6tc_insert_entry(chain, fw, rulenum, handle); 752 } 753 } 754 755 return ret; 756} 757 758static unsigned char * 759make_delete_mask(const struct xtables_rule_match *matches, 760 const struct xtables_target *target) 761{ 762 /* Establish mask for comparison */ 763 unsigned int size; 764 const struct xtables_rule_match *matchp; 765 unsigned char *mask, *mptr; 766 767 size = sizeof(struct ip6t_entry); 768 for (matchp = matches; matchp; matchp = matchp->next) 769 size += XT_ALIGN(sizeof(struct xt_entry_match)) + matchp->match->size; 770 771 mask = xtables_calloc(1, size 772 + XT_ALIGN(sizeof(struct xt_entry_target)) 773 + target->size); 774 775 memset(mask, 0xFF, sizeof(struct ip6t_entry)); 776 mptr = mask + sizeof(struct ip6t_entry); 777 778 for (matchp = matches; matchp; matchp = matchp->next) { 779 memset(mptr, 0xFF, 780 XT_ALIGN(sizeof(struct xt_entry_match)) 781 + matchp->match->userspacesize); 782 mptr += XT_ALIGN(sizeof(struct xt_entry_match)) + matchp->match->size; 783 } 784 785 memset(mptr, 0xFF, 786 XT_ALIGN(sizeof(struct xt_entry_target)) 787 + target->userspacesize); 788 789 return mask; 790} 791 792static int 793delete_entry(const xt_chainlabel chain, 794 struct ip6t_entry *fw, 795 unsigned int nsaddrs, 796 const struct in6_addr saddrs[], 797 const struct in6_addr smasks[], 798 unsigned int ndaddrs, 799 const struct in6_addr daddrs[], 800 const struct in6_addr dmasks[], 801 int verbose, 802 struct xtc_handle *handle, 803 struct xtables_rule_match *matches, 804 const struct xtables_target *target) 805{ 806 unsigned int i, j; 807 int ret = 1; 808 unsigned char *mask; 809 810 mask = make_delete_mask(matches, target); 811 for (i = 0; i < nsaddrs; i++) { 812 fw->ipv6.src = saddrs[i]; 813 fw->ipv6.smsk = smasks[i]; 814 for (j = 0; j < ndaddrs; j++) { 815 fw->ipv6.dst = daddrs[j]; 816 fw->ipv6.dmsk = dmasks[j]; 817 if (verbose) 818 print_firewall_line(fw, handle); 819 ret &= ip6tc_delete_entry(chain, fw, mask, handle); 820 } 821 } 822 free(mask); 823 824 return ret; 825} 826 827static int 828check_entry(const xt_chainlabel chain, struct ip6t_entry *fw, 829 unsigned int nsaddrs, const struct in6_addr *saddrs, 830 const struct in6_addr *smasks, unsigned int ndaddrs, 831 const struct in6_addr *daddrs, const struct in6_addr *dmasks, 832 bool verbose, struct xtc_handle *handle, 833 struct xtables_rule_match *matches, 834 const struct xtables_target *target) 835{ 836 unsigned int i, j; 837 int ret = 1; 838 unsigned char *mask; 839 840 mask = make_delete_mask(matches, target); 841 for (i = 0; i < nsaddrs; i++) { 842 fw->ipv6.src = saddrs[i]; 843 fw->ipv6.smsk = smasks[i]; 844 for (j = 0; j < ndaddrs; j++) { 845 fw->ipv6.dst = daddrs[j]; 846 fw->ipv6.dmsk = dmasks[j]; 847 if (verbose) 848 print_firewall_line(fw, handle); 849 ret &= ip6tc_check_entry(chain, fw, mask, handle); 850 } 851 } 852 853 free(mask); 854 return ret; 855} 856 857int 858for_each_chain6(int (*fn)(const xt_chainlabel, int, struct xtc_handle *), 859 int verbose, int builtinstoo, struct xtc_handle *handle) 860{ 861 int ret = 1; 862 const char *chain; 863 char *chains; 864 unsigned int i, chaincount = 0; 865 866 chain = ip6tc_first_chain(handle); 867 while (chain) { 868 chaincount++; 869 chain = ip6tc_next_chain(handle); 870 } 871 872 chains = xtables_malloc(sizeof(xt_chainlabel) * chaincount); 873 i = 0; 874 chain = ip6tc_first_chain(handle); 875 while (chain) { 876 strcpy(chains + i*sizeof(xt_chainlabel), chain); 877 i++; 878 chain = ip6tc_next_chain(handle); 879 } 880 881 for (i = 0; i < chaincount; i++) { 882 if (!builtinstoo 883 && ip6tc_builtin(chains + i*sizeof(xt_chainlabel), 884 handle) == 1) 885 continue; 886 ret &= fn(chains + i*sizeof(xt_chainlabel), verbose, handle); 887 } 888 889 free(chains); 890 return ret; 891} 892 893int 894flush_entries6(const xt_chainlabel chain, int verbose, 895 struct xtc_handle *handle) 896{ 897 if (!chain) 898 return for_each_chain6(flush_entries6, verbose, 1, handle); 899 900 if (verbose) 901 fprintf(stdout, "Flushing chain `%s'\n", chain); 902 return ip6tc_flush_entries(chain, handle); 903} 904 905static int 906zero_entries(const xt_chainlabel chain, int verbose, 907 struct xtc_handle *handle) 908{ 909 if (!chain) 910 return for_each_chain6(zero_entries, verbose, 1, handle); 911 912 if (verbose) 913 fprintf(stdout, "Zeroing chain `%s'\n", chain); 914 return ip6tc_zero_entries(chain, handle); 915} 916 917int 918delete_chain6(const xt_chainlabel chain, int verbose, 919 struct xtc_handle *handle) 920{ 921 if (!chain) 922 return for_each_chain6(delete_chain6, verbose, 0, handle); 923 924 if (verbose) 925 fprintf(stdout, "Deleting chain `%s'\n", chain); 926 return ip6tc_delete_chain(chain, handle); 927} 928 929static int 930list_entries(const xt_chainlabel chain, int rulenum, int verbose, int numeric, 931 int expanded, int linenumbers, struct xtc_handle *handle) 932{ 933 int found = 0; 934 unsigned int format; 935 const char *this; 936 937 format = FMT_OPTIONS; 938 if (!verbose) 939 format |= FMT_NOCOUNTS; 940 else 941 format |= FMT_VIA; 942 943 if (numeric) 944 format |= FMT_NUMERIC; 945 946 if (!expanded) 947 format |= FMT_KILOMEGAGIGA; 948 949 if (linenumbers) 950 format |= FMT_LINENUMBERS; 951 952 for (this = ip6tc_first_chain(handle); 953 this; 954 this = ip6tc_next_chain(handle)) { 955 const struct ip6t_entry *i; 956 unsigned int num; 957 958 if (chain && strcmp(chain, this) != 0) 959 continue; 960 961 if (found) printf("\n"); 962 963 if (!rulenum) 964 print_header(format, this, handle); 965 i = ip6tc_first_rule(this, handle); 966 967 num = 0; 968 while (i) { 969 num++; 970 if (!rulenum || num == rulenum) 971 print_firewall(i, 972 ip6tc_get_target(i, handle), 973 num, 974 format, 975 handle); 976 i = ip6tc_next_rule(i, handle); 977 } 978 found = 1; 979 } 980 981 errno = ENOENT; 982 return found; 983} 984 985/* This assumes that mask is contiguous, and byte-bounded. */ 986static void 987print_iface(char letter, const char *iface, const unsigned char *mask, 988 int invert) 989{ 990 unsigned int i; 991 992 if (mask[0] == 0) 993 return; 994 995 printf("%s -%c ", invert ? " !" : "", letter); 996 997 for (i = 0; i < IFNAMSIZ; i++) { 998 if (mask[i] != 0) { 999 if (iface[i] != '\0') 1000 printf("%c", iface[i]); 1001 } else { 1002 /* we can access iface[i-1] here, because 1003 * a few lines above we make sure that mask[0] != 0 */ 1004 if (iface[i-1] != '\0') 1005 printf("+"); 1006 break; 1007 } 1008 } 1009} 1010 1011/* The ip6tables looks up the /etc/protocols. */ 1012static void print_proto(uint16_t proto, int invert) 1013{ 1014 if (proto) { 1015 unsigned int i; 1016 const char *invertstr = invert ? " !" : ""; 1017 1018 const struct protoent *pent = getprotobynumber(proto); 1019 if (pent) { 1020 printf("%s -p %s", 1021 invertstr, pent->p_name); 1022 return; 1023 } 1024 1025 for (i = 0; xtables_chain_protos[i].name != NULL; ++i) 1026 if (xtables_chain_protos[i].num == proto) { 1027 printf("%s -p %s", 1028 invertstr, xtables_chain_protos[i].name); 1029 return; 1030 } 1031 1032 printf("%s -p %u", invertstr, proto); 1033 } 1034} 1035 1036static int print_match_save(const struct xt_entry_match *e, 1037 const struct ip6t_ip6 *ip) 1038{ 1039 const struct xtables_match *match = 1040 xtables_find_match(e->u.user.name, XTF_TRY_LOAD, NULL); 1041 1042 if (match) { 1043 printf(" -m %s", e->u.user.name); 1044 1045 /* some matches don't provide a save function */ 1046 if (match->save) 1047 match->save(ip, e); 1048 } else { 1049 if (e->u.match_size) { 1050 fprintf(stderr, 1051 "Can't find library for match `%s'\n", 1052 e->u.user.name); 1053 exit(1); 1054 } 1055 } 1056 return 0; 1057} 1058 1059/* print a given ip including mask if neccessary */ 1060static void print_ip(const char *prefix, const struct in6_addr *ip, 1061 const struct in6_addr *mask, int invert) 1062{ 1063 char buf[51]; 1064 int l = ipv6_prefix_length(mask); 1065 1066 if (l == 0 && !invert) 1067 return; 1068 1069 printf("%s %s %s", 1070 invert ? " !" : "", 1071 prefix, 1072 inet_ntop(AF_INET6, ip, buf, sizeof buf)); 1073 1074 if (l == -1) 1075 printf("/%s", inet_ntop(AF_INET6, mask, buf, sizeof buf)); 1076 else 1077 printf("/%d", l); 1078} 1079 1080/* We want this to be readable, so only print out neccessary fields. 1081 * Because that's the kind of world I want to live in. */ 1082void print_rule6(const struct ip6t_entry *e, 1083 struct xtc_handle *h, const char *chain, int counters) 1084{ 1085 const struct xt_entry_target *t; 1086 const char *target_name; 1087 1088 /* print counters for iptables-save */ 1089 if (counters > 0) 1090 printf("[%llu:%llu] ", (unsigned long long)e->counters.pcnt, (unsigned long long)e->counters.bcnt); 1091 1092 /* print chain name */ 1093 printf("-A %s", chain); 1094 1095 /* Print IP part. */ 1096 print_ip("-s", &(e->ipv6.src), &(e->ipv6.smsk), 1097 e->ipv6.invflags & IP6T_INV_SRCIP); 1098 1099 print_ip("-d", &(e->ipv6.dst), &(e->ipv6.dmsk), 1100 e->ipv6.invflags & IP6T_INV_DSTIP); 1101 1102 print_iface('i', e->ipv6.iniface, e->ipv6.iniface_mask, 1103 e->ipv6.invflags & IP6T_INV_VIA_IN); 1104 1105 print_iface('o', e->ipv6.outiface, e->ipv6.outiface_mask, 1106 e->ipv6.invflags & IP6T_INV_VIA_OUT); 1107 1108 print_proto(e->ipv6.proto, e->ipv6.invflags & XT_INV_PROTO); 1109 1110#if 0 1111 /* not definied in ipv6 1112 * FIXME: linux/netfilter_ipv6/ip6_tables: IP6T_INV_FRAG why definied? */ 1113 if (e->ipv6.flags & IPT_F_FRAG) 1114 printf("%s -f", 1115 e->ipv6.invflags & IP6T_INV_FRAG ? " !" : ""); 1116#endif 1117 1118 if (e->ipv6.flags & IP6T_F_TOS) 1119 printf("%s -? %d", 1120 e->ipv6.invflags & IP6T_INV_TOS ? " !" : "", 1121 e->ipv6.tos); 1122 1123 /* Print matchinfo part */ 1124 if (e->target_offset) { 1125 IP6T_MATCH_ITERATE(e, print_match_save, &e->ipv6); 1126 } 1127 1128 /* print counters for iptables -R */ 1129 if (counters < 0) 1130 printf(" -c %llu %llu", (unsigned long long)e->counters.pcnt, (unsigned long long)e->counters.bcnt); 1131 1132 /* Print target name */ 1133 target_name = ip6tc_get_target(e, h); 1134 if (target_name && (*target_name != '\0')) 1135#ifdef IP6T_F_GOTO 1136 printf(" -%c %s", e->ipv6.flags & IP6T_F_GOTO ? 'g' : 'j', target_name); 1137#else 1138 printf(" -j %s", target_name); 1139#endif 1140 1141 /* Print targinfo part */ 1142 t = ip6t_get_target((struct ip6t_entry *)e); 1143 if (t->u.user.name[0]) { 1144 struct xtables_target *target = 1145 xtables_find_target(t->u.user.name, XTF_TRY_LOAD); 1146 1147 if (!target) { 1148 fprintf(stderr, "Can't find library for target `%s'\n", 1149 t->u.user.name); 1150 exit(1); 1151 } 1152 1153 if (target->save) 1154 target->save(&e->ipv6, t); 1155 else { 1156 /* If the target size is greater than xt_entry_target 1157 * there is something to be saved, we just don't know 1158 * how to print it */ 1159 if (t->u.target_size != 1160 sizeof(struct xt_entry_target)) { 1161 fprintf(stderr, "Target `%s' is missing " 1162 "save function\n", 1163 t->u.user.name); 1164 exit(1); 1165 } 1166 } 1167 } 1168 printf("\n"); 1169} 1170 1171static int 1172list_rules(const xt_chainlabel chain, int rulenum, int counters, 1173 struct xtc_handle *handle) 1174{ 1175 const char *this = NULL; 1176 int found = 0; 1177 1178 if (counters) 1179 counters = -1; /* iptables -c format */ 1180 1181 /* Dump out chain names first, 1182 * thereby preventing dependency conflicts */ 1183 if (!rulenum) for (this = ip6tc_first_chain(handle); 1184 this; 1185 this = ip6tc_next_chain(handle)) { 1186 if (chain && strcmp(this, chain) != 0) 1187 continue; 1188 1189 if (ip6tc_builtin(this, handle)) { 1190 struct xt_counters count; 1191 printf("-P %s %s", this, ip6tc_get_policy(this, &count, handle)); 1192 if (counters) 1193 printf(" -c %llu %llu", (unsigned long long)count.pcnt, (unsigned long long)count.bcnt); 1194 printf("\n"); 1195 } else { 1196 printf("-N %s\n", this); 1197 } 1198 } 1199 1200 for (this = ip6tc_first_chain(handle); 1201 this; 1202 this = ip6tc_next_chain(handle)) { 1203 const struct ip6t_entry *e; 1204 int num = 0; 1205 1206 if (chain && strcmp(this, chain) != 0) 1207 continue; 1208 1209 /* Dump out rules */ 1210 e = ip6tc_first_rule(this, handle); 1211 while(e) { 1212 num++; 1213 if (!rulenum || num == rulenum) 1214 print_rule6(e, handle, this, counters); 1215 e = ip6tc_next_rule(e, handle); 1216 } 1217 found = 1; 1218 } 1219 1220 errno = ENOENT; 1221 return found; 1222} 1223 1224static struct ip6t_entry * 1225generate_entry(const struct ip6t_entry *fw, 1226 struct xtables_rule_match *matches, 1227 struct xt_entry_target *target) 1228{ 1229 unsigned int size; 1230 struct xtables_rule_match *matchp; 1231 struct ip6t_entry *e; 1232 1233 size = sizeof(struct ip6t_entry); 1234 for (matchp = matches; matchp; matchp = matchp->next) 1235 size += matchp->match->m->u.match_size; 1236 1237 e = xtables_malloc(size + target->u.target_size); 1238 *e = *fw; 1239 e->target_offset = size; 1240 e->next_offset = size + target->u.target_size; 1241 1242 size = 0; 1243 for (matchp = matches; matchp; matchp = matchp->next) { 1244 memcpy(e->elems + size, matchp->match->m, matchp->match->m->u.match_size); 1245 size += matchp->match->m->u.match_size; 1246 } 1247 memcpy(e->elems + size, target, target->u.target_size); 1248 1249 return e; 1250} 1251 1252static void command_jump(struct iptables_command_state *cs) 1253{ 1254 size_t size; 1255 1256 set_option(&cs->options, OPT_JUMP, &cs->fw6.ipv6.invflags, cs->invert); 1257 cs->jumpto = parse_target(optarg); 1258 /* TRY_LOAD (may be chain name) */ 1259 cs->target = xtables_find_target(cs->jumpto, XTF_TRY_LOAD); 1260 1261 if (cs->target == NULL) 1262 return; 1263 1264 size = XT_ALIGN(sizeof(struct xt_entry_target)) + cs->target->size; 1265 1266 cs->target->t = xtables_calloc(1, size); 1267 cs->target->t->u.target_size = size; 1268 if (cs->target->real_name == NULL) { 1269 strcpy(cs->target->t->u.user.name, cs->jumpto); 1270 } else { 1271 strcpy(cs->target->t->u.user.name, cs->target->real_name); 1272 fprintf(stderr, "WARNING: The %s target is obsolete. " 1273 "Use %s instead.\n", 1274 cs->jumpto, cs->target->real_name); 1275 } 1276 cs->target->t->u.user.revision = cs->target->revision; 1277 1278 xs_init_target(cs->target); 1279 if (cs->target->x6_options != NULL) 1280 opts = xtables_options_xfrm(ip6tables_globals.orig_opts, opts, 1281 cs->target->x6_options, 1282 &cs->target->option_offset); 1283 else 1284 opts = xtables_merge_options(ip6tables_globals.orig_opts, opts, 1285 cs->target->extra_opts, 1286 &cs->target->option_offset); 1287 if (opts == NULL) 1288 xtables_error(OTHER_PROBLEM, "can't alloc memory!"); 1289} 1290 1291static void command_match(struct iptables_command_state *cs) 1292{ 1293 struct xtables_match *m; 1294 size_t size; 1295 1296 if (cs->invert) 1297 xtables_error(PARAMETER_PROBLEM, 1298 "unexpected ! flag before --match"); 1299 1300 m = xtables_find_match(optarg, XTF_LOAD_MUST_SUCCEED, &cs->matches); 1301 size = XT_ALIGN(sizeof(struct xt_entry_match)) + m->size; 1302 m->m = xtables_calloc(1, size); 1303 m->m->u.match_size = size; 1304 if (m->real_name == NULL) { 1305 strcpy(m->m->u.user.name, m->name); 1306 } else { 1307 strcpy(m->m->u.user.name, m->real_name); 1308 fprintf(stderr, "WARNING: The %s match is obsolete. " 1309 "Use %s instead.\n", m->name, m->real_name); 1310 } 1311 m->m->u.user.revision = m->revision; 1312 1313 xs_init_match(m); 1314 if (m == m->next) 1315 return; 1316 /* Merge options for non-cloned matches */ 1317 if (m->x6_options != NULL) 1318 opts = xtables_options_xfrm(ip6tables_globals.orig_opts, opts, 1319 m->x6_options, &m->option_offset); 1320 else if (m->extra_opts != NULL) 1321 opts = xtables_merge_options(ip6tables_globals.orig_opts, opts, 1322 m->extra_opts, &m->option_offset); 1323} 1324 1325int do_command6(int argc, char *argv[], char **table, struct xtc_handle **handle) 1326{ 1327 struct iptables_command_state cs; 1328 struct ip6t_entry *e = NULL; 1329 unsigned int nsaddrs = 0, ndaddrs = 0; 1330 struct in6_addr *saddrs = NULL, *daddrs = NULL; 1331 struct in6_addr *smasks = NULL, *dmasks = NULL; 1332 1333 int verbose = 0; 1334 const char *chain = NULL; 1335 const char *shostnetworkmask = NULL, *dhostnetworkmask = NULL; 1336 const char *policy = NULL, *newname = NULL; 1337 unsigned int rulenum = 0, command = 0; 1338 const char *pcnt = NULL, *bcnt = NULL; 1339 int ret = 1; 1340 struct xtables_match *m; 1341 struct xtables_rule_match *matchp; 1342 struct xtables_target *t; 1343 unsigned long long cnt; 1344 1345 memset(&cs, 0, sizeof(cs)); 1346 cs.jumpto = ""; 1347 cs.argv = argv; 1348 1349 /* re-set optind to 0 in case do_command6 gets called 1350 * a second time */ 1351 optind = 0; 1352 1353 /* clear mflags in case do_command6 gets called a second time 1354 * (we clear the global list of all matches for security)*/ 1355 for (m = xtables_matches; m; m = m->next) 1356 m->mflags = 0; 1357 1358 for (t = xtables_targets; t; t = t->next) { 1359 t->tflags = 0; 1360 t->used = 0; 1361 } 1362 1363 /* Suppress error messages: we may add new options if we 1364 demand-load a protocol. */ 1365 opterr = 0; 1366 1367 opts = xt_params->orig_opts; 1368 while ((cs.c = getopt_long(argc, argv, 1369 "-:A:C:D:R:I:L::S::M:F::Z::N:X::E:P:Vh::o:p:s:d:j:i:bvnt:m:xc:g:46", 1370 opts, NULL)) != -1) { 1371 switch (cs.c) { 1372 /* 1373 * Command selection 1374 */ 1375 case 'A': 1376 add_command(&command, CMD_APPEND, CMD_NONE, 1377 cs.invert); 1378 chain = optarg; 1379 break; 1380 1381 case 'C': 1382 add_command(&command, CMD_CHECK, CMD_NONE, 1383 cs.invert); 1384 chain = optarg; 1385 break; 1386 1387 case 'D': 1388 add_command(&command, CMD_DELETE, CMD_NONE, 1389 cs.invert); 1390 chain = optarg; 1391 if (optind < argc && argv[optind][0] != '-' 1392 && argv[optind][0] != '!') { 1393 rulenum = parse_rulenumber(argv[optind++]); 1394 command = CMD_DELETE_NUM; 1395 } 1396 break; 1397 1398 case 'R': 1399 add_command(&command, CMD_REPLACE, CMD_NONE, 1400 cs.invert); 1401 chain = optarg; 1402 if (optind < argc && argv[optind][0] != '-' 1403 && argv[optind][0] != '!') 1404 rulenum = parse_rulenumber(argv[optind++]); 1405 else 1406 xtables_error(PARAMETER_PROBLEM, 1407 "-%c requires a rule number", 1408 cmd2char(CMD_REPLACE)); 1409 break; 1410 1411 case 'I': 1412 add_command(&command, CMD_INSERT, CMD_NONE, 1413 cs.invert); 1414 chain = optarg; 1415 if (optind < argc && argv[optind][0] != '-' 1416 && argv[optind][0] != '!') 1417 rulenum = parse_rulenumber(argv[optind++]); 1418 else rulenum = 1; 1419 break; 1420 1421 case 'L': 1422 add_command(&command, CMD_LIST, 1423 CMD_ZERO | CMD_ZERO_NUM, cs.invert); 1424 if (optarg) chain = optarg; 1425 else if (optind < argc && argv[optind][0] != '-' 1426 && argv[optind][0] != '!') 1427 chain = argv[optind++]; 1428 if (optind < argc && argv[optind][0] != '-' 1429 && argv[optind][0] != '!') 1430 rulenum = parse_rulenumber(argv[optind++]); 1431 break; 1432 1433 case 'S': 1434 add_command(&command, CMD_LIST_RULES, 1435 CMD_ZERO | CMD_ZERO_NUM, cs.invert); 1436 if (optarg) chain = optarg; 1437 else if (optind < argc && argv[optind][0] != '-' 1438 && argv[optind][0] != '!') 1439 chain = argv[optind++]; 1440 if (optind < argc && argv[optind][0] != '-' 1441 && argv[optind][0] != '!') 1442 rulenum = parse_rulenumber(argv[optind++]); 1443 break; 1444 1445 case 'F': 1446 add_command(&command, CMD_FLUSH, CMD_NONE, 1447 cs.invert); 1448 if (optarg) chain = optarg; 1449 else if (optind < argc && argv[optind][0] != '-' 1450 && argv[optind][0] != '!') 1451 chain = argv[optind++]; 1452 break; 1453 1454 case 'Z': 1455 add_command(&command, CMD_ZERO, CMD_LIST|CMD_LIST_RULES, 1456 cs.invert); 1457 if (optarg) chain = optarg; 1458 else if (optind < argc && argv[optind][0] != '-' 1459 && argv[optind][0] != '!') 1460 chain = argv[optind++]; 1461 if (optind < argc && argv[optind][0] != '-' 1462 && argv[optind][0] != '!') { 1463 rulenum = parse_rulenumber(argv[optind++]); 1464 command = CMD_ZERO_NUM; 1465 } 1466 break; 1467 1468 case 'N': 1469 if (optarg && (*optarg == '-' || *optarg == '!')) 1470 xtables_error(PARAMETER_PROBLEM, 1471 "chain name not allowed to start " 1472 "with `%c'\n", *optarg); 1473 if (xtables_find_target(optarg, XTF_TRY_LOAD)) 1474 xtables_error(PARAMETER_PROBLEM, 1475 "chain name may not clash " 1476 "with target name\n"); 1477 add_command(&command, CMD_NEW_CHAIN, CMD_NONE, 1478 cs.invert); 1479 chain = optarg; 1480 break; 1481 1482 case 'X': 1483 add_command(&command, CMD_DELETE_CHAIN, CMD_NONE, 1484 cs.invert); 1485 if (optarg) chain = optarg; 1486 else if (optind < argc && argv[optind][0] != '-' 1487 && argv[optind][0] != '!') 1488 chain = argv[optind++]; 1489 break; 1490 1491 case 'E': 1492 add_command(&command, CMD_RENAME_CHAIN, CMD_NONE, 1493 cs.invert); 1494 chain = optarg; 1495 if (optind < argc && argv[optind][0] != '-' 1496 && argv[optind][0] != '!') 1497 newname = argv[optind++]; 1498 else 1499 xtables_error(PARAMETER_PROBLEM, 1500 "-%c requires old-chain-name and " 1501 "new-chain-name", 1502 cmd2char(CMD_RENAME_CHAIN)); 1503 break; 1504 1505 case 'P': 1506 add_command(&command, CMD_SET_POLICY, CMD_NONE, 1507 cs.invert); 1508 chain = optarg; 1509 if (optind < argc && argv[optind][0] != '-' 1510 && argv[optind][0] != '!') 1511 policy = argv[optind++]; 1512 else 1513 xtables_error(PARAMETER_PROBLEM, 1514 "-%c requires a chain and a policy", 1515 cmd2char(CMD_SET_POLICY)); 1516 break; 1517 1518 case 'h': 1519 if (!optarg) 1520 optarg = argv[optind]; 1521 1522 /* ip6tables -p icmp -h */ 1523 if (!cs.matches && cs.protocol) 1524 xtables_find_match(cs.protocol, XTF_TRY_LOAD, 1525 &cs.matches); 1526 1527 exit_printhelp(cs.matches); 1528 1529 /* 1530 * Option selection 1531 */ 1532 case 'p': 1533 set_option(&cs.options, OPT_PROTOCOL, &cs.fw6.ipv6.invflags, 1534 cs.invert); 1535 1536 /* Canonicalize into lower case */ 1537 for (cs.protocol = optarg; *cs.protocol; cs.protocol++) 1538 *cs.protocol = tolower(*cs.protocol); 1539 1540 cs.protocol = optarg; 1541 cs.fw6.ipv6.proto = xtables_parse_protocol(cs.protocol); 1542 cs.fw6.ipv6.flags |= IP6T_F_PROTO; 1543 1544 if (cs.fw6.ipv6.proto == 0 1545 && (cs.fw6.ipv6.invflags & XT_INV_PROTO)) 1546 xtables_error(PARAMETER_PROBLEM, 1547 "rule would never match protocol"); 1548 1549 if (is_exthdr(cs.fw6.ipv6.proto) 1550 && (cs.fw6.ipv6.invflags & XT_INV_PROTO) == 0) 1551 fprintf(stderr, 1552 "Warning: never matched protocol: %s. " 1553 "use extension match instead.\n", 1554 cs.protocol); 1555 break; 1556 1557 case 's': 1558 set_option(&cs.options, OPT_SOURCE, &cs.fw6.ipv6.invflags, 1559 cs.invert); 1560 shostnetworkmask = optarg; 1561 break; 1562 1563 case 'd': 1564 set_option(&cs.options, OPT_DESTINATION, &cs.fw6.ipv6.invflags, 1565 cs.invert); 1566 dhostnetworkmask = optarg; 1567 break; 1568 1569#ifdef IP6T_F_GOTO 1570 case 'g': 1571 set_option(&cs.options, OPT_JUMP, &cs.fw6.ipv6.invflags, 1572 cs.invert); 1573 cs.fw6.ipv6.flags |= IP6T_F_GOTO; 1574 cs.jumpto = parse_target(optarg); 1575 break; 1576#endif 1577 1578 case 'j': 1579 command_jump(&cs); 1580 break; 1581 1582 1583 case 'i': 1584 if (*optarg == '\0') 1585 xtables_error(PARAMETER_PROBLEM, 1586 "Empty interface is likely to be " 1587 "undesired"); 1588 set_option(&cs.options, OPT_VIANAMEIN, &cs.fw6.ipv6.invflags, 1589 cs.invert); 1590 xtables_parse_interface(optarg, 1591 cs.fw6.ipv6.iniface, 1592 cs.fw6.ipv6.iniface_mask); 1593 break; 1594 1595 case 'o': 1596 if (*optarg == '\0') 1597 xtables_error(PARAMETER_PROBLEM, 1598 "Empty interface is likely to be " 1599 "undesired"); 1600 set_option(&cs.options, OPT_VIANAMEOUT, &cs.fw6.ipv6.invflags, 1601 cs.invert); 1602 xtables_parse_interface(optarg, 1603 cs.fw6.ipv6.outiface, 1604 cs.fw6.ipv6.outiface_mask); 1605 break; 1606 1607 case 'v': 1608 if (!verbose) 1609 set_option(&cs.options, OPT_VERBOSE, 1610 &cs.fw6.ipv6.invflags, cs.invert); 1611 verbose++; 1612 break; 1613 1614 case 'm': 1615 command_match(&cs); 1616 break; 1617 1618 case 'n': 1619 set_option(&cs.options, OPT_NUMERIC, &cs.fw6.ipv6.invflags, 1620 cs.invert); 1621 break; 1622 1623 case 't': 1624 if (cs.invert) 1625 xtables_error(PARAMETER_PROBLEM, 1626 "unexpected ! flag before --table"); 1627 *table = optarg; 1628 break; 1629 1630 case 'x': 1631 set_option(&cs.options, OPT_EXPANDED, &cs.fw6.ipv6.invflags, 1632 cs.invert); 1633 break; 1634 1635 case 'V': 1636 if (cs.invert) 1637 printf("Not %s ;-)\n", prog_vers); 1638 else 1639 printf("%s v%s\n", 1640 prog_name, prog_vers); 1641 exit(0); 1642 1643 case '0': 1644 set_option(&cs.options, OPT_LINENUMBERS, &cs.fw6.ipv6.invflags, 1645 cs.invert); 1646 break; 1647 1648 case 'M': 1649 xtables_modprobe_program = optarg; 1650 break; 1651 1652 case 'c': 1653 1654 set_option(&cs.options, OPT_COUNTERS, &cs.fw6.ipv6.invflags, 1655 cs.invert); 1656 pcnt = optarg; 1657 bcnt = strchr(pcnt + 1, ','); 1658 if (bcnt) 1659 bcnt++; 1660 if (!bcnt && optind < argc && argv[optind][0] != '-' 1661 && argv[optind][0] != '!') 1662 bcnt = argv[optind++]; 1663 if (!bcnt) 1664 xtables_error(PARAMETER_PROBLEM, 1665 "-%c requires packet and byte counter", 1666 opt2char(OPT_COUNTERS)); 1667 1668 if (sscanf(pcnt, "%llu", &cnt) != 1) 1669 xtables_error(PARAMETER_PROBLEM, 1670 "-%c packet counter not numeric", 1671 opt2char(OPT_COUNTERS)); 1672 cs.fw6.counters.pcnt = cnt; 1673 1674 if (sscanf(bcnt, "%llu", &cnt) != 1) 1675 xtables_error(PARAMETER_PROBLEM, 1676 "-%c byte counter not numeric", 1677 opt2char(OPT_COUNTERS)); 1678 cs.fw6.counters.bcnt = cnt; 1679 break; 1680 1681 case '4': 1682 /* This is not the IPv4 iptables */ 1683 if (line != -1) 1684 return 1; /* success: line ignored */ 1685 fprintf(stderr, "This is the IPv6 version of ip6tables.\n"); 1686 exit_tryhelp(2); 1687 1688 case '6': 1689 /* This is indeed the IPv6 ip6tables */ 1690 break; 1691 1692 case 1: /* non option */ 1693 if (optarg[0] == '!' && optarg[1] == '\0') { 1694 if (cs.invert) 1695 xtables_error(PARAMETER_PROBLEM, 1696 "multiple consecutive ! not" 1697 " allowed"); 1698 cs.invert = TRUE; 1699 optarg[0] = '\0'; 1700 continue; 1701 } 1702 fprintf(stderr, "Bad argument `%s'\n", optarg); 1703 exit_tryhelp(2); 1704 1705 default: 1706 if (command_default(&cs, &ip6tables_globals) == 1) 1707 /* 1708 * If new options were loaded, we must retry 1709 * getopt immediately and not allow 1710 * cs.invert=FALSE to be executed. 1711 */ 1712 continue; 1713 break; 1714 } 1715 cs.invert = FALSE; 1716 } 1717 1718 for (matchp = cs.matches; matchp; matchp = matchp->next) 1719 xtables_option_mfcall(matchp->match); 1720 if (cs.target != NULL) 1721 xtables_option_tfcall(cs.target); 1722 1723 /* Fix me: must put inverse options checking here --MN */ 1724 1725 if (optind < argc) 1726 xtables_error(PARAMETER_PROBLEM, 1727 "unknown arguments found on commandline"); 1728 if (!command) 1729 xtables_error(PARAMETER_PROBLEM, "no command specified"); 1730 if (cs.invert) 1731 xtables_error(PARAMETER_PROBLEM, 1732 "nothing appropriate following !"); 1733 1734 if (command & (CMD_REPLACE | CMD_INSERT | CMD_DELETE | CMD_APPEND | CMD_CHECK)) { 1735 if (!(cs.options & OPT_DESTINATION)) 1736 dhostnetworkmask = "::0/0"; 1737 if (!(cs.options & OPT_SOURCE)) 1738 shostnetworkmask = "::0/0"; 1739 } 1740 1741 if (shostnetworkmask) 1742 xtables_ip6parse_multiple(shostnetworkmask, &saddrs, 1743 &smasks, &nsaddrs); 1744 1745 if (dhostnetworkmask) 1746 xtables_ip6parse_multiple(dhostnetworkmask, &daddrs, 1747 &dmasks, &ndaddrs); 1748 1749 if ((nsaddrs > 1 || ndaddrs > 1) && 1750 (cs.fw6.ipv6.invflags & (IP6T_INV_SRCIP | IP6T_INV_DSTIP))) 1751 xtables_error(PARAMETER_PROBLEM, "! not allowed with multiple" 1752 " source or destination IP addresses"); 1753 1754 if (command == CMD_REPLACE && (nsaddrs != 1 || ndaddrs != 1)) 1755 xtables_error(PARAMETER_PROBLEM, "Replacement rule does not " 1756 "specify a unique address"); 1757 1758 generic_opt_check(command, cs.options); 1759 1760 if (chain != NULL && strlen(chain) >= XT_EXTENSION_MAXNAMELEN) 1761 xtables_error(PARAMETER_PROBLEM, 1762 "chain name `%s' too long (must be under %u chars)", 1763 chain, XT_EXTENSION_MAXNAMELEN); 1764 1765 /* only allocate handle if we weren't called with a handle */ 1766 if (!*handle) 1767 *handle = ip6tc_init(*table); 1768 1769 /* try to insmod the module if iptc_init failed */ 1770 if (!*handle && xtables_load_ko(xtables_modprobe_program, false) != -1) 1771 *handle = ip6tc_init(*table); 1772 1773 if (!*handle) 1774 xtables_error(VERSION_PROBLEM, 1775 "can't initialize ip6tables table `%s': %s", 1776 *table, ip6tc_strerror(errno)); 1777 1778 if (command == CMD_APPEND 1779 || command == CMD_DELETE 1780 || command == CMD_CHECK 1781 || command == CMD_INSERT 1782 || command == CMD_REPLACE) { 1783 if (strcmp(chain, "PREROUTING") == 0 1784 || strcmp(chain, "INPUT") == 0) { 1785 /* -o not valid with incoming packets. */ 1786 if (cs.options & OPT_VIANAMEOUT) 1787 xtables_error(PARAMETER_PROBLEM, 1788 "Can't use -%c with %s\n", 1789 opt2char(OPT_VIANAMEOUT), 1790 chain); 1791 } 1792 1793 if (strcmp(chain, "POSTROUTING") == 0 1794 || strcmp(chain, "OUTPUT") == 0) { 1795 /* -i not valid with outgoing packets */ 1796 if (cs.options & OPT_VIANAMEIN) 1797 xtables_error(PARAMETER_PROBLEM, 1798 "Can't use -%c with %s\n", 1799 opt2char(OPT_VIANAMEIN), 1800 chain); 1801 } 1802 1803 if (cs.target && ip6tc_is_chain(cs.jumpto, *handle)) { 1804 fprintf(stderr, 1805 "Warning: using chain %s, not extension\n", 1806 cs.jumpto); 1807 1808 if (cs.target->t) 1809 free(cs.target->t); 1810 1811 cs.target = NULL; 1812 } 1813 1814 /* If they didn't specify a target, or it's a chain 1815 name, use standard. */ 1816 if (!cs.target 1817 && (strlen(cs.jumpto) == 0 1818 || ip6tc_is_chain(cs.jumpto, *handle))) { 1819 size_t size; 1820 1821 cs.target = xtables_find_target(XT_STANDARD_TARGET, 1822 XTF_LOAD_MUST_SUCCEED); 1823 1824 size = sizeof(struct xt_entry_target) 1825 + cs.target->size; 1826 cs.target->t = xtables_calloc(1, size); 1827 cs.target->t->u.target_size = size; 1828 strcpy(cs.target->t->u.user.name, cs.jumpto); 1829 xs_init_target(cs.target); 1830 } 1831 1832 if (!cs.target) { 1833 /* it is no chain, and we can't load a plugin. 1834 * We cannot know if the plugin is corrupt, non 1835 * existant OR if the user just misspelled a 1836 * chain. */ 1837#ifdef IP6T_F_GOTO 1838 if (cs.fw6.ipv6.flags & IP6T_F_GOTO) 1839 xtables_error(PARAMETER_PROBLEM, 1840 "goto '%s' is not a chain\n", 1841 cs.jumpto); 1842#endif 1843 xtables_find_target(cs.jumpto, XTF_LOAD_MUST_SUCCEED); 1844 } else { 1845 e = generate_entry(&cs.fw6, cs.matches, cs.target->t); 1846 free(cs.target->t); 1847 } 1848 } 1849 1850 switch (command) { 1851 case CMD_APPEND: 1852 ret = append_entry(chain, e, 1853 nsaddrs, saddrs, smasks, 1854 ndaddrs, daddrs, dmasks, 1855 cs.options&OPT_VERBOSE, 1856 *handle); 1857 break; 1858 case CMD_DELETE: 1859 ret = delete_entry(chain, e, 1860 nsaddrs, saddrs, smasks, 1861 ndaddrs, daddrs, dmasks, 1862 cs.options&OPT_VERBOSE, 1863 *handle, cs.matches, cs.target); 1864 break; 1865 case CMD_DELETE_NUM: 1866 ret = ip6tc_delete_num_entry(chain, rulenum - 1, *handle); 1867 break; 1868 case CMD_CHECK: 1869 ret = check_entry(chain, e, 1870 nsaddrs, saddrs, smasks, 1871 ndaddrs, daddrs, dmasks, 1872 cs.options&OPT_VERBOSE, 1873 *handle, cs.matches, cs.target); 1874 break; 1875 case CMD_REPLACE: 1876 ret = replace_entry(chain, e, rulenum - 1, 1877 saddrs, smasks, daddrs, dmasks, 1878 cs.options&OPT_VERBOSE, *handle); 1879 break; 1880 case CMD_INSERT: 1881 ret = insert_entry(chain, e, rulenum - 1, 1882 nsaddrs, saddrs, smasks, 1883 ndaddrs, daddrs, dmasks, 1884 cs.options&OPT_VERBOSE, 1885 *handle); 1886 break; 1887 case CMD_FLUSH: 1888 ret = flush_entries6(chain, cs.options&OPT_VERBOSE, *handle); 1889 break; 1890 case CMD_ZERO: 1891 ret = zero_entries(chain, cs.options&OPT_VERBOSE, *handle); 1892 break; 1893 case CMD_ZERO_NUM: 1894 ret = ip6tc_zero_counter(chain, rulenum, *handle); 1895 break; 1896 case CMD_LIST: 1897 case CMD_LIST|CMD_ZERO: 1898 case CMD_LIST|CMD_ZERO_NUM: 1899 ret = list_entries(chain, 1900 rulenum, 1901 cs.options&OPT_VERBOSE, 1902 cs.options&OPT_NUMERIC, 1903 cs.options&OPT_EXPANDED, 1904 cs.options&OPT_LINENUMBERS, 1905 *handle); 1906 if (ret && (command & CMD_ZERO)) 1907 ret = zero_entries(chain, 1908 cs.options&OPT_VERBOSE, *handle); 1909 if (ret && (command & CMD_ZERO_NUM)) 1910 ret = ip6tc_zero_counter(chain, rulenum, *handle); 1911 break; 1912 case CMD_LIST_RULES: 1913 case CMD_LIST_RULES|CMD_ZERO: 1914 case CMD_LIST_RULES|CMD_ZERO_NUM: 1915 ret = list_rules(chain, 1916 rulenum, 1917 cs.options&OPT_VERBOSE, 1918 *handle); 1919 if (ret && (command & CMD_ZERO)) 1920 ret = zero_entries(chain, 1921 cs.options&OPT_VERBOSE, *handle); 1922 if (ret && (command & CMD_ZERO_NUM)) 1923 ret = ip6tc_zero_counter(chain, rulenum, *handle); 1924 break; 1925 case CMD_NEW_CHAIN: 1926 ret = ip6tc_create_chain(chain, *handle); 1927 break; 1928 case CMD_DELETE_CHAIN: 1929 ret = delete_chain6(chain, cs.options&OPT_VERBOSE, *handle); 1930 break; 1931 case CMD_RENAME_CHAIN: 1932 ret = ip6tc_rename_chain(chain, newname, *handle); 1933 break; 1934 case CMD_SET_POLICY: 1935 ret = ip6tc_set_policy(chain, policy, cs.options&OPT_COUNTERS ? &cs.fw6.counters : NULL, *handle); 1936 break; 1937 default: 1938 /* We should never reach this... */ 1939 exit_tryhelp(2); 1940 } 1941 1942 if (verbose > 1) 1943 dump_entries6(*handle); 1944 1945 xtables_rule_matches_free(&cs.matches); 1946 1947 if (e != NULL) { 1948 free(e); 1949 e = NULL; 1950 } 1951 1952 free(saddrs); 1953 free(smasks); 1954 free(daddrs); 1955 free(dmasks); 1956 xtables_free_opts(1); 1957 1958 return ret; 1959} 1960