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 <dlfcn.h> 35#include <ctype.h> 36#include <stdarg.h> 37#include <limits.h> 38#include <ip6tables.h> 39#include <arpa/inet.h> 40#include <unistd.h> 41#include <fcntl.h> 42#include <sys/wait.h> 43#include <sys/types.h> 44#include <sys/socket.h> 45 46#ifndef TRUE 47#define TRUE 1 48#endif 49#ifndef FALSE 50#define FALSE 0 51#endif 52 53#ifndef PROC_SYS_MODPROBE 54#define PROC_SYS_MODPROBE "/proc/sys/kernel/modprobe" 55#endif 56 57#define FMT_NUMERIC 0x0001 58#define FMT_NOCOUNTS 0x0002 59#define FMT_KILOMEGAGIGA 0x0004 60#define FMT_OPTIONS 0x0008 61#define FMT_NOTABLE 0x0010 62#define FMT_NOTARGET 0x0020 63#define FMT_VIA 0x0040 64#define FMT_NONEWLINE 0x0080 65#define FMT_LINENUMBERS 0x0100 66 67#define FMT_PRINT_RULE (FMT_NOCOUNTS | FMT_OPTIONS | FMT_VIA \ 68 | FMT_NUMERIC | FMT_NOTABLE) 69#define FMT(tab,notab) ((format) & FMT_NOTABLE ? (notab) : (tab)) 70 71 72#define CMD_NONE 0x0000U 73#define CMD_INSERT 0x0001U 74#define CMD_DELETE 0x0002U 75#define CMD_DELETE_NUM 0x0004U 76#define CMD_REPLACE 0x0008U 77#define CMD_APPEND 0x0010U 78#define CMD_LIST 0x0020U 79#define CMD_FLUSH 0x0040U 80#define CMD_ZERO 0x0080U 81#define CMD_NEW_CHAIN 0x0100U 82#define CMD_DELETE_CHAIN 0x0200U 83#define CMD_SET_POLICY 0x0400U 84#define CMD_RENAME_CHAIN 0x0800U 85#define NUMBER_OF_CMD 13 86static const char cmdflags[] = { 'I', 'D', 'D', 'R', 'A', 'L', 'F', 'Z', 87 'N', 'X', 'P', 'E' }; 88 89#define OPTION_OFFSET 256 90 91#define OPT_NONE 0x00000U 92#define OPT_NUMERIC 0x00001U 93#define OPT_SOURCE 0x00002U 94#define OPT_DESTINATION 0x00004U 95#define OPT_PROTOCOL 0x00008U 96#define OPT_JUMP 0x00010U 97#define OPT_VERBOSE 0x00020U 98#define OPT_EXPANDED 0x00040U 99#define OPT_VIANAMEIN 0x00080U 100#define OPT_VIANAMEOUT 0x00100U 101#define OPT_LINENUMBERS 0x00200U 102#define OPT_COUNTERS 0x00400U 103#define NUMBER_OF_OPT 11 104static const char optflags[NUMBER_OF_OPT] 105= { 'n', 's', 'd', 'p', 'j', 'v', 'x', 'i', 'o', '0', 'c'}; 106 107static struct option original_opts[] = { 108 { "append", 1, 0, 'A' }, 109 { "delete", 1, 0, 'D' }, 110 { "insert", 1, 0, 'I' }, 111 { "replace", 1, 0, 'R' }, 112 { "list", 2, 0, 'L' }, 113 { "flush", 2, 0, 'F' }, 114 { "zero", 2, 0, 'Z' }, 115 { "new-chain", 1, 0, 'N' }, 116 { "delete-chain", 2, 0, 'X' }, 117 { "rename-chain", 1, 0, 'E' }, 118 { "policy", 1, 0, 'P' }, 119 { "source", 1, 0, 's' }, 120 { "destination", 1, 0, 'd' }, 121 { "src", 1, 0, 's' }, /* synonym */ 122 { "dst", 1, 0, 'd' }, /* synonym */ 123 { "protocol", 1, 0, 'p' }, 124 { "in-interface", 1, 0, 'i' }, 125 { "jump", 1, 0, 'j' }, 126 { "table", 1, 0, 't' }, 127 { "match", 1, 0, 'm' }, 128 { "numeric", 0, 0, 'n' }, 129 { "out-interface", 1, 0, 'o' }, 130 { "verbose", 0, 0, 'v' }, 131 { "exact", 0, 0, 'x' }, 132 { "version", 0, 0, 'V' }, 133 { "help", 2, 0, 'h' }, 134 { "line-numbers", 0, 0, '0' }, 135 { "modprobe", 1, 0, 'M' }, 136 { "set-counters", 1, 0, 'c' }, 137 { 0 } 138}; 139 140/* we need this for ip6tables-restore. ip6tables-restore.c sets line to the 141 * current line of the input file, in order to give a more precise error 142 * message. ip6tables itself doesn't need this, so it is initialized to the 143 * magic number of -1 */ 144int line = -1; 145 146static struct option *opts = original_opts; 147static unsigned int global_option_offset = 0; 148 149/* Table of legal combinations of commands and options. If any of the 150 * given commands make an option legal, that option is legal (applies to 151 * CMD_LIST and CMD_ZERO only). 152 * Key: 153 * + compulsory 154 * x illegal 155 * optional 156 */ 157 158static char commands_v_options[NUMBER_OF_CMD][NUMBER_OF_OPT] = 159/* Well, it's better than "Re: Linux vs FreeBSD" */ 160{ 161 /* -n -s -d -p -j -v -x -i -o --line -c */ 162/*INSERT*/ {'x',' ',' ',' ',' ',' ','x',' ',' ','x',' '}, 163/*DELETE*/ {'x',' ',' ',' ',' ',' ','x',' ',' ','x','x'}, 164/*DELETE_NUM*/{'x','x','x','x','x',' ','x','x','x','x','x'}, 165/*REPLACE*/ {'x',' ',' ',' ',' ',' ','x',' ',' ','x',' '}, 166/*APPEND*/ {'x',' ',' ',' ',' ',' ','x',' ',' ','x',' '}, 167/*LIST*/ {' ','x','x','x','x',' ',' ','x','x',' ','x'}, 168/*FLUSH*/ {'x','x','x','x','x',' ','x','x','x','x','x'}, 169/*ZERO*/ {'x','x','x','x','x',' ','x','x','x','x','x'}, 170/*NEW_CHAIN*/ {'x','x','x','x','x',' ','x','x','x','x','x'}, 171/*DEL_CHAIN*/ {'x','x','x','x','x',' ','x','x','x','x','x'}, 172/*SET_POLICY*/{'x','x','x','x','x',' ','x','x','x','x','x'}, 173/*RENAME*/ {'x','x','x','x','x',' ','x','x','x','x','x'} 174}; 175 176static int inverse_for_options[NUMBER_OF_OPT] = 177{ 178/* -n */ 0, 179/* -s */ IP6T_INV_SRCIP, 180/* -d */ IP6T_INV_DSTIP, 181/* -p */ IP6T_INV_PROTO, 182/* -j */ 0, 183/* -v */ 0, 184/* -x */ 0, 185/* -i */ IP6T_INV_VIA_IN, 186/* -o */ IP6T_INV_VIA_OUT, 187/*--line*/ 0, 188/* -c */ 0, 189}; 190 191const char *program_version; 192const char *program_name; 193char *lib_dir; 194 195/* the path to command to load kernel module */ 196const char *modprobe = NULL; 197 198/* Keeping track of external matches and targets: linked lists. */ 199struct ip6tables_match *ip6tables_matches = NULL; 200struct ip6tables_target *ip6tables_targets = NULL; 201 202/* Extra debugging from libiptc */ 203extern void dump_entries6(const ip6tc_handle_t handle); 204 205/* A few hardcoded protocols for 'all' and in case the user has no 206 /etc/protocols */ 207struct pprot { 208 char *name; 209 u_int8_t num; 210}; 211 212/* Primitive headers... */ 213/* defined in netinet/in.h */ 214#if 0 215#ifndef IPPROTO_ESP 216#define IPPROTO_ESP 50 217#endif 218#ifndef IPPROTO_AH 219#define IPPROTO_AH 51 220#endif 221#endif 222 223static const struct pprot chain_protos[] = { 224 { "tcp", IPPROTO_TCP }, 225 { "udp", IPPROTO_UDP }, 226 { "udplite", IPPROTO_UDPLITE }, 227 { "icmpv6", IPPROTO_ICMPV6 }, 228 { "ipv6-icmp", IPPROTO_ICMPV6 }, 229 { "esp", IPPROTO_ESP }, 230 { "ah", IPPROTO_AH }, 231}; 232 233static char * 234proto_to_name(u_int8_t proto, int nolookup) 235{ 236 unsigned int i; 237 238 if (proto && !nolookup) { 239 struct protoent *pent = getprotobynumber(proto); 240 if (pent) 241 return pent->p_name; 242 } 243 244 for (i = 0; i < sizeof(chain_protos)/sizeof(struct pprot); i++) 245 if (chain_protos[i].num == proto) 246 return chain_protos[i].name; 247 248 return NULL; 249} 250 251int 252service_to_port(const char *name, const char *proto) 253{ 254 struct servent *service; 255 256 if ((service = getservbyname(name, proto)) != NULL) 257 return ntohs((unsigned short) service->s_port); 258 259 return -1; 260} 261 262u_int16_t 263parse_port(const char *port, const char *proto) 264{ 265 unsigned int portnum; 266 267 if ((string_to_number(port, 0, 65535, &portnum)) != -1 || 268 (portnum = service_to_port(port, proto)) != -1) 269 return (u_int16_t)portnum; 270 271 exit_error(PARAMETER_PROBLEM, 272 "invalid port/service `%s' specified", port); 273} 274 275static void 276in6addrcpy(struct in6_addr *dst, struct in6_addr *src) 277{ 278 memcpy(dst, src, sizeof(struct in6_addr)); 279 /* dst->s6_addr = src->s6_addr; */ 280} 281 282static void free_opts(int reset_offset) 283{ 284 if (opts != original_opts) { 285 free(opts); 286 opts = original_opts; 287 if (reset_offset) 288 global_option_offset = 0; 289 } 290} 291 292void 293exit_error(enum exittype status, char *msg, ...) 294{ 295 va_list args; 296 297 va_start(args, msg); 298 fprintf(stderr, "%s v%s: ", program_name, program_version); 299 vfprintf(stderr, msg, args); 300 va_end(args); 301 fprintf(stderr, "\n"); 302 if (status == PARAMETER_PROBLEM) 303 exit_tryhelp(status); 304 if (status == VERSION_PROBLEM) 305 fprintf(stderr, 306 "Perhaps ip6tables or your kernel needs to be upgraded.\n"); 307 /* On error paths, make sure that we don't leak memory */ 308 free_opts(1); 309 exit(status); 310} 311 312void 313exit_tryhelp(int status) 314{ 315 if (line != -1) 316 fprintf(stderr, "Error occurred at line: %d\n", line); 317 fprintf(stderr, "Try `%s -h' or '%s --help' for more information.\n", 318 program_name, program_name ); 319 free_opts(1); 320 exit(status); 321} 322 323void 324exit_printhelp(struct ip6tables_rule_match *matches) 325{ 326 struct ip6tables_rule_match *matchp = NULL; 327 struct ip6tables_target *t = NULL; 328 329 printf("%s v%s\n\n" 330"Usage: %s -[AD] chain rule-specification [options]\n" 331" %s -[RI] chain rulenum rule-specification [options]\n" 332" %s -D chain rulenum [options]\n" 333" %s -[LFZ] [chain] [options]\n" 334" %s -[NX] chain\n" 335" %s -E old-chain-name new-chain-name\n" 336" %s -P chain target [options]\n" 337" %s -h (print this help information)\n\n", 338 program_name, program_version, program_name, program_name, 339 program_name, program_name, program_name, program_name, 340 program_name, program_name); 341 342 printf( 343"Commands:\n" 344"Either long or short options are allowed.\n" 345" --append -A chain Append to chain\n" 346" --delete -D chain Delete matching rule from chain\n" 347" --delete -D chain rulenum\n" 348" Delete rule rulenum (1 = first) from chain\n" 349" --insert -I chain [rulenum]\n" 350" Insert in chain as rulenum (default 1=first)\n" 351" --replace -R chain rulenum\n" 352" Replace rule rulenum (1 = first) in chain\n" 353" --list -L [chain] List the rules in a chain or all chains\n" 354" --flush -F [chain] Delete all rules in chain or all chains\n" 355" --zero -Z [chain] Zero counters in chain or all chains\n" 356" --new -N chain Create a new user-defined chain\n" 357" --delete-chain\n" 358" -X [chain] Delete a user-defined chain\n" 359" --policy -P chain target\n" 360" Change policy on chain to target\n" 361" --rename-chain\n" 362" -E old-chain new-chain\n" 363" Change chain name, (moving any references)\n" 364 365"Options:\n" 366" --proto -p [!] proto protocol: by number or name, eg. `tcp'\n" 367" --source -s [!] address[/mask]\n" 368" source specification\n" 369" --destination -d [!] address[/mask]\n" 370" destination specification\n" 371" --in-interface -i [!] input name[+]\n" 372" network interface name ([+] for wildcard)\n" 373" --jump -j target\n" 374" target for rule (may load target extension)\n" 375" --match -m match\n" 376" extended match (may load extension)\n" 377" --numeric -n numeric output of addresses and ports\n" 378" --out-interface -o [!] output name[+]\n" 379" network interface name ([+] for wildcard)\n" 380" --table -t table table to manipulate (default: `filter')\n" 381" --verbose -v verbose mode\n" 382" --line-numbers print line numbers when listing\n" 383" --exact -x expand numbers (display exact values)\n" 384/*"[!] --fragment -f match second or further fragments only\n"*/ 385" --modprobe=<command> try to insert modules using this command\n" 386" --set-counters PKTS BYTES set the counter during insert/append\n" 387"[!] --version -V print package version.\n"); 388 389 /* Print out any special helps. A user might like to be able to add a --help 390 to the commandline, and see expected results. So we call help for all 391 specified matches & targets */ 392 for (t = ip6tables_targets; t; t = t->next) { 393 if (t->used) { 394 printf("\n"); 395 t->help(); 396 } 397 } 398 for (matchp = matches; matchp; matchp = matchp->next) { 399 printf("\n"); 400 matchp->match->help(); 401 } 402 exit(0); 403} 404 405static void 406generic_opt_check(int command, int options) 407{ 408 int i, j, legal = 0; 409 410 /* Check that commands are valid with options. Complicated by the 411 * fact that if an option is legal with *any* command given, it is 412 * legal overall (ie. -z and -l). 413 */ 414 for (i = 0; i < NUMBER_OF_OPT; i++) { 415 legal = 0; /* -1 => illegal, 1 => legal, 0 => undecided. */ 416 417 for (j = 0; j < NUMBER_OF_CMD; j++) { 418 if (!(command & (1<<j))) 419 continue; 420 421 if (!(options & (1<<i))) { 422 if (commands_v_options[j][i] == '+') 423 exit_error(PARAMETER_PROBLEM, 424 "You need to supply the `-%c' " 425 "option for this command\n", 426 optflags[i]); 427 } else { 428 if (commands_v_options[j][i] != 'x') 429 legal = 1; 430 else if (legal == 0) 431 legal = -1; 432 } 433 } 434 if (legal == -1) 435 exit_error(PARAMETER_PROBLEM, 436 "Illegal option `-%c' with this command\n", 437 optflags[i]); 438 } 439} 440 441static char 442opt2char(int option) 443{ 444 const char *ptr; 445 for (ptr = optflags; option > 1; option >>= 1, ptr++); 446 447 return *ptr; 448} 449 450static char 451cmd2char(int option) 452{ 453 const char *ptr; 454 for (ptr = cmdflags; option > 1; option >>= 1, ptr++); 455 456 return *ptr; 457} 458 459static void 460add_command(unsigned int *cmd, const int newcmd, const int othercmds, 461 int invert) 462{ 463 if (invert) 464 exit_error(PARAMETER_PROBLEM, "unexpected ! flag"); 465 if (*cmd & (~othercmds)) 466 exit_error(PARAMETER_PROBLEM, "Can't use -%c with -%c\n", 467 cmd2char(newcmd), cmd2char(*cmd & (~othercmds))); 468 *cmd |= newcmd; 469} 470 471int 472check_inverse(const char option[], int *invert, int *optind, int argc) 473{ 474 if (option && strcmp(option, "!") == 0) { 475 if (*invert) 476 exit_error(PARAMETER_PROBLEM, 477 "Multiple `!' flags not allowed"); 478 *invert = TRUE; 479 if (optind) { 480 *optind = *optind+1; 481 if (argc && *optind > argc) 482 exit_error(PARAMETER_PROBLEM, 483 "no argument following `!'"); 484 } 485 486 return TRUE; 487 } 488 return FALSE; 489} 490 491static void * 492fw_calloc(size_t count, size_t size) 493{ 494 void *p; 495 496 if ((p = calloc(count, size)) == NULL) { 497 perror("ip6tables: calloc failed"); 498 exit(1); 499 } 500 return p; 501} 502 503static void * 504fw_malloc(size_t size) 505{ 506 void *p; 507 508 if ((p = malloc(size)) == NULL) { 509 perror("ip6tables: malloc failed"); 510 exit(1); 511 } 512 return p; 513} 514 515static char * 516addr_to_numeric(const struct in6_addr *addrp) 517{ 518 /* 0000:0000:0000:0000:0000:000.000.000.000 519 * 0000:0000:0000:0000:0000:0000:0000:0000 */ 520 static char buf[50+1]; 521 return (char *)inet_ntop(AF_INET6, addrp, buf, sizeof(buf)); 522} 523 524static struct in6_addr * 525numeric_to_addr(const char *num) 526{ 527 static struct in6_addr ap; 528 int err; 529 if ((err=inet_pton(AF_INET6, num, &ap)) == 1) 530 return ≈ 531#ifdef DEBUG 532 fprintf(stderr, "\nnumeric2addr: %d\n", err); 533#endif 534 return (struct in6_addr *)NULL; 535} 536 537 538static struct in6_addr * 539host_to_addr(const char *name, unsigned int *naddr) 540{ 541 struct addrinfo hints; 542 struct addrinfo *res; 543 static struct in6_addr *addr; 544 int err; 545 546 memset(&hints, 0, sizeof(hints)); 547 hints.ai_flags=AI_CANONNAME; 548 hints.ai_family=AF_INET6; 549 hints.ai_socktype=SOCK_RAW; 550 hints.ai_protocol=41; 551 hints.ai_next=NULL; 552 553 *naddr = 0; 554 if ( (err=getaddrinfo(name, NULL, &hints, &res)) != 0 ){ 555#ifdef DEBUG 556 fprintf(stderr,"Name2IP: %s\n",gai_strerror(err)); 557#endif 558 return (struct in6_addr *) NULL; 559 } else { 560 if (res->ai_family != AF_INET6 || 561 res->ai_addrlen != sizeof(struct sockaddr_in6)) 562 return (struct in6_addr *) NULL; 563 564#ifdef DEBUG 565 fprintf(stderr, "resolved: len=%d %s ", res->ai_addrlen, 566 addr_to_numeric(&(((struct sockaddr_in6 *)res->ai_addr)->sin6_addr))); 567#endif 568 /* Get the first element of the address-chain */ 569 addr = fw_calloc(1, sizeof(struct in6_addr)); 570 in6addrcpy(addr, (struct in6_addr *) 571 &((struct sockaddr_in6 *)res->ai_addr)->sin6_addr); 572 freeaddrinfo(res); 573 *naddr = 1; 574 return addr; 575 } 576 577 return (struct in6_addr *) NULL; 578} 579 580static char * 581addr_to_host(const struct in6_addr *addr) 582{ 583 struct sockaddr_in6 saddr; 584 int err; 585 static char hostname[NI_MAXHOST]; 586 587 memset(&saddr, 0, sizeof(struct sockaddr_in6)); 588 in6addrcpy(&(saddr.sin6_addr),(struct in6_addr *)addr); 589 saddr.sin6_family = AF_INET6; 590 591 if ( (err=getnameinfo((struct sockaddr *)&saddr, 592 sizeof(struct sockaddr_in6), 593 hostname, sizeof(hostname)-1, 594 NULL, 0, 0)) != 0 ){ 595#ifdef DEBUG 596 fprintf(stderr,"IP2Name: %s\n",gai_strerror(err)); 597#endif 598 return (char *) NULL; 599 } else { 600#ifdef DEBUG 601 fprintf (stderr, "\naddr2host: %s\n", hostname); 602#endif 603 604 return hostname; 605 } 606 607 return (char *) NULL; 608} 609 610static char * 611mask_to_numeric(const struct in6_addr *addrp) 612{ 613 static char buf[50+2]; 614 int l = ipv6_prefix_length(addrp); 615 if (l == -1) { 616 strcpy(buf, "/"); 617 strcat(buf, addr_to_numeric(addrp)); 618 return buf; 619 } 620 sprintf(buf, "/%d", l); 621 return buf; 622} 623 624static struct in6_addr * 625network_to_addr(const char *name) 626{ 627 /* abort();*/ 628 /* TODO: not implemented yet, but the exception breaks the 629 * name resolvation */ 630 return (struct in6_addr *)NULL; 631} 632 633static char * 634addr_to_anyname(const struct in6_addr *addr) 635{ 636 char *name; 637 638 if ((name = addr_to_host(addr)) != NULL) 639 return name; 640 641 return addr_to_numeric(addr); 642} 643 644/* 645 * All functions starting with "parse" should succeed, otherwise 646 * the program fails. 647 * Most routines return pointers to static data that may change 648 * between calls to the same or other routines with a few exceptions: 649 * "host_to_addr", "parse_hostnetwork", and "parse_hostnetworkmask" 650 * return global static data. 651*/ 652 653static struct in6_addr * 654parse_hostnetwork(const char *name, unsigned int *naddrs) 655{ 656 struct in6_addr *addrp, *addrptmp; 657 658 if ((addrptmp = numeric_to_addr(name)) != NULL || 659 (addrptmp = network_to_addr(name)) != NULL) { 660 addrp = fw_malloc(sizeof(struct in6_addr)); 661 in6addrcpy(addrp, addrptmp); 662 *naddrs = 1; 663 return addrp; 664 } 665 if ((addrp = host_to_addr(name, naddrs)) != NULL) 666 return addrp; 667 668 exit_error(PARAMETER_PROBLEM, "host/network `%s' not found", name); 669} 670 671static struct in6_addr * 672parse_mask(char *mask) 673{ 674 static struct in6_addr maskaddr; 675 struct in6_addr *addrp; 676 unsigned int bits; 677 678 if (mask == NULL) { 679 /* no mask at all defaults to 128 bits */ 680 memset(&maskaddr, 0xff, sizeof maskaddr); 681 return &maskaddr; 682 } 683 if ((addrp = numeric_to_addr(mask)) != NULL) 684 return addrp; 685 if (string_to_number(mask, 0, 128, &bits) == -1) 686 exit_error(PARAMETER_PROBLEM, 687 "invalid mask `%s' specified", mask); 688 if (bits != 0) { 689 char *p = (char *)&maskaddr; 690 memset(p, 0xff, bits / 8); 691 memset(p + (bits / 8) + 1, 0, (128 - bits) / 8); 692 p[bits / 8] = 0xff << (8 - (bits & 7)); 693 return &maskaddr; 694 } 695 696 memset(&maskaddr, 0, sizeof maskaddr); 697 return &maskaddr; 698} 699 700void 701parse_hostnetworkmask(const char *name, struct in6_addr **addrpp, 702 struct in6_addr *maskp, unsigned int *naddrs) 703{ 704 struct in6_addr *addrp; 705 char buf[256]; 706 char *p; 707 int i, j, n; 708 709 strncpy(buf, name, sizeof(buf) - 1); 710 buf[sizeof(buf) - 1] = '\0'; 711 if ((p = strrchr(buf, '/')) != NULL) { 712 *p = '\0'; 713 addrp = parse_mask(p + 1); 714 } else 715 addrp = parse_mask(NULL); 716 in6addrcpy(maskp, addrp); 717 718 /* if a null mask is given, the name is ignored, like in "any/0" */ 719 if (!memcmp(maskp, &in6addr_any, sizeof(in6addr_any))) 720 strcpy(buf, "::"); 721 722 addrp = *addrpp = parse_hostnetwork(buf, naddrs); 723 n = *naddrs; 724 for (i = 0, j = 0; i < n; i++) { 725 int k; 726 for (k = 0; k < 4; k++) 727 addrp[j].in6_u.u6_addr32[k] &= maskp->in6_u.u6_addr32[k]; 728 j++; 729 for (k = 0; k < j - 1; k++) { 730 if (IN6_ARE_ADDR_EQUAL(&addrp[k], &addrp[j - 1])) { 731 (*naddrs)--; 732 j--; 733 break; 734 } 735 } 736 } 737} 738 739struct ip6tables_match * 740find_match(const char *match_name, enum ip6t_tryload tryload, struct ip6tables_rule_match **matches) 741{ 742 struct ip6tables_match *ptr; 743 const char *icmp6 = "icmp6"; 744 const char *name; 745 746 /* This is ugly as hell. Nonetheless, there is no way of changing 747 * this without hurting backwards compatibility */ 748 if ( (strcmp(match_name,"icmpv6") == 0) || 749 (strcmp(match_name,"ipv6-icmp") == 0) || 750 (strcmp(match_name,"icmp6") == 0) ) 751 name = icmp6; 752 else 753 name = match_name; 754 755 for (ptr = ip6tables_matches; ptr; ptr = ptr->next) { 756 if (strcmp(name, ptr->name) == 0) { 757 struct ip6tables_match *clone; 758 759 /* First match of this type: */ 760 if (ptr->m == NULL) 761 break; 762 763 /* Second and subsequent clones */ 764 clone = fw_malloc(sizeof(struct ip6tables_match)); 765 memcpy(clone, ptr, sizeof(struct ip6tables_match)); 766 clone->mflags = 0; 767 /* This is a clone: */ 768 clone->next = clone; 769 770 ptr = clone; 771 break; 772 } 773 } 774 775#ifndef NO_SHARED_LIBS 776 if (!ptr && tryload != DONT_LOAD && tryload != DURING_LOAD) { 777 char path[strlen(lib_dir) + sizeof("/libip6t_.so") 778 + strlen(name)]; 779 sprintf(path, "%s/libip6t_%s.so", lib_dir, name); 780 if (dlopen(path, RTLD_NOW)) { 781 /* Found library. If it didn't register itself, 782 maybe they specified target as match. */ 783 ptr = find_match(name, DONT_LOAD, NULL); 784 785 if (!ptr) 786 exit_error(PARAMETER_PROBLEM, 787 "Couldn't load match `%s'\n", 788 name); 789 } else if (tryload == LOAD_MUST_SUCCEED) 790 exit_error(PARAMETER_PROBLEM, 791 "Couldn't load match `%s':%s\n", 792 name, dlerror()); 793 } 794#else 795 if (ptr && !ptr->loaded) { 796 if (tryload != DONT_LOAD) 797 ptr->loaded = 1; 798 else 799 ptr = NULL; 800 } 801 if(!ptr && (tryload == LOAD_MUST_SUCCEED)) { 802 exit_error(PARAMETER_PROBLEM, 803 "Couldn't find match `%s'\n", name); 804 } 805#endif 806 807 if (ptr && matches) { 808 struct ip6tables_rule_match **i; 809 struct ip6tables_rule_match *newentry; 810 811 newentry = fw_malloc(sizeof(struct ip6tables_rule_match)); 812 813 for (i = matches; *i; i = &(*i)->next) { 814 if (strcmp(name, (*i)->match->name) == 0) 815 (*i)->completed = 1; 816 } 817 newentry->match = ptr; 818 newentry->completed = 0; 819 newentry->next = NULL; 820 *i = newentry; 821 } 822 823 return ptr; 824} 825 826/* Christophe Burki wants `-p 6' to imply `-m tcp'. */ 827static struct ip6tables_match * 828find_proto(const char *pname, enum ip6t_tryload tryload, int nolookup, struct ip6tables_rule_match **matches) 829{ 830 unsigned int proto; 831 832 if (string_to_number(pname, 0, 255, &proto) != -1) { 833 char *protoname = proto_to_name(proto, nolookup); 834 835 if (protoname) 836 return find_match(protoname, tryload, matches); 837 } else 838 return find_match(pname, tryload, matches); 839 840 return NULL; 841} 842 843u_int16_t 844parse_protocol(const char *s) 845{ 846 unsigned int proto; 847 848 if (string_to_number(s, 0, 255, &proto) == -1) { 849 struct protoent *pent; 850 851 /* first deal with the special case of 'all' to prevent 852 * people from being able to redefine 'all' in nsswitch 853 * and/or provoke expensive [not working] ldap/nis/... 854 * lookups */ 855 if (!strcmp(s, "all")) 856 return 0; 857 858 if ((pent = getprotobyname(s))) 859 proto = pent->p_proto; 860 else { 861 unsigned int i; 862 for (i = 0; 863 i < sizeof(chain_protos)/sizeof(struct pprot); 864 i++) { 865 if (strcmp(s, chain_protos[i].name) == 0) { 866 proto = chain_protos[i].num; 867 break; 868 } 869 } 870 if (i == sizeof(chain_protos)/sizeof(struct pprot)) 871 exit_error(PARAMETER_PROBLEM, 872 "unknown protocol `%s' specified", 873 s); 874 } 875 } 876 877 return (u_int16_t)proto; 878} 879 880/* proto means IPv6 extension header ? */ 881static int is_exthdr(u_int16_t proto) 882{ 883 return (proto == IPPROTO_HOPOPTS || 884 proto == IPPROTO_ROUTING || 885 proto == IPPROTO_FRAGMENT || 886 proto == IPPROTO_ESP || 887 proto == IPPROTO_AH || 888 proto == IPPROTO_DSTOPTS); 889} 890 891void parse_interface(const char *arg, char *vianame, unsigned char *mask) 892{ 893 int vialen = strlen(arg); 894 unsigned int i; 895 896 memset(mask, 0, IFNAMSIZ); 897 memset(vianame, 0, IFNAMSIZ); 898 899 if (vialen + 1 > IFNAMSIZ) 900 exit_error(PARAMETER_PROBLEM, 901 "interface name `%s' must be shorter than IFNAMSIZ" 902 " (%i)", arg, IFNAMSIZ-1); 903 904 strcpy(vianame, arg); 905 if ((vialen == 0) || (vialen == 1 && vianame[0] == '+')) 906 memset(mask, 0, IFNAMSIZ); 907 else if (vianame[vialen - 1] == '+') { 908 memset(mask, 0xFF, vialen - 1); 909 memset(mask + vialen - 1, 0, IFNAMSIZ - vialen + 1); 910 /* Don't remove `+' here! -HW */ 911 } else { 912 /* Include nul-terminator in match */ 913 memset(mask, 0xFF, vialen + 1); 914 memset(mask + vialen + 1, 0, IFNAMSIZ - vialen - 1); 915 for (i = 0; vianame[i]; i++) { 916 if (vianame[i] == ':' || 917 vianame[i] == '!' || 918 vianame[i] == '*') { 919 printf("Warning: weird character in interface" 920 " `%s' (No aliases, :, ! or *).\n", 921 vianame); 922 break; 923 } 924 } 925 } 926} 927 928/* Can't be zero. */ 929static int 930parse_rulenumber(const char *rule) 931{ 932 unsigned int rulenum; 933 934 if (string_to_number(rule, 1, INT_MAX, &rulenum) == -1) 935 exit_error(PARAMETER_PROBLEM, 936 "Invalid rule number `%s'", rule); 937 938 return rulenum; 939} 940 941static const char * 942parse_target(const char *targetname) 943{ 944 const char *ptr; 945 946 if (strlen(targetname) < 1) 947 exit_error(PARAMETER_PROBLEM, 948 "Invalid target name (too short)"); 949 950 if (strlen(targetname)+1 > sizeof(ip6t_chainlabel)) 951 exit_error(PARAMETER_PROBLEM, 952 "Invalid target name `%s' (%u chars max)", 953 targetname, (unsigned int)sizeof(ip6t_chainlabel)-1); 954 955 for (ptr = targetname; *ptr; ptr++) 956 if (isspace(*ptr)) 957 exit_error(PARAMETER_PROBLEM, 958 "Invalid target name `%s'", targetname); 959 return targetname; 960} 961 962int 963string_to_number_ll(const char *s, unsigned long long min, unsigned long long max, 964 unsigned long long *ret) 965{ 966 unsigned long long number; 967 char *end; 968 969 /* Handle hex, octal, etc. */ 970 errno = 0; 971 number = strtoull(s, &end, 0); 972 if (*end == '\0' && end != s) { 973 /* we parsed a number, let's see if we want this */ 974 if (errno != ERANGE && min <= number && (!max || number <= max)) { 975 *ret = number; 976 return 0; 977 } 978 } 979 return -1; 980} 981 982int 983string_to_number_l(const char *s, unsigned long min, unsigned long max, 984 unsigned long *ret) 985{ 986 int result; 987 unsigned long long number; 988 989 result = string_to_number_ll(s, min, max, &number); 990 *ret = (unsigned long)number; 991 992 return result; 993} 994 995int string_to_number(const char *s, unsigned int min, unsigned int max, 996 unsigned int *ret) 997{ 998 int result; 999 unsigned long number; 1000 1001 result = string_to_number_l(s, min, max, &number); 1002 *ret = (unsigned int)number; 1003 1004 return result; 1005} 1006 1007static void 1008set_option(unsigned int *options, unsigned int option, u_int8_t *invflg, 1009 int invert) 1010{ 1011 if (*options & option) 1012 exit_error(PARAMETER_PROBLEM, "multiple -%c flags not allowed", 1013 opt2char(option)); 1014 *options |= option; 1015 1016 if (invert) { 1017 unsigned int i; 1018 for (i = 0; 1 << i != option; i++); 1019 1020 if (!inverse_for_options[i]) 1021 exit_error(PARAMETER_PROBLEM, 1022 "cannot have ! before -%c", 1023 opt2char(option)); 1024 *invflg |= inverse_for_options[i]; 1025 } 1026} 1027 1028struct ip6tables_target * 1029find_target(const char *name, enum ip6t_tryload tryload) 1030{ 1031 struct ip6tables_target *ptr; 1032 1033 /* Standard target? */ 1034 if (strcmp(name, "") == 0 1035 || strcmp(name, IP6TC_LABEL_ACCEPT) == 0 1036 || strcmp(name, IP6TC_LABEL_DROP) == 0 1037 || strcmp(name, IP6TC_LABEL_QUEUE) == 0 1038 || strcmp(name, IP6TC_LABEL_RETURN) == 0) 1039 name = "standard"; 1040 1041 for (ptr = ip6tables_targets; ptr; ptr = ptr->next) { 1042 if (strcmp(name, ptr->name) == 0) 1043 break; 1044 } 1045 1046#ifndef NO_SHARED_LIBS 1047 if (!ptr && tryload != DONT_LOAD && tryload != DURING_LOAD) { 1048 char path[strlen(lib_dir) + sizeof("/libip6t_.so") 1049 + strlen(name)]; 1050 sprintf(path, "%s/libip6t_%s.so", lib_dir, name); 1051 if (dlopen(path, RTLD_NOW)) { 1052 /* Found library. If it didn't register itself, 1053 maybe they specified match as a target. */ 1054 ptr = find_target(name, DONT_LOAD); 1055 if (!ptr) 1056 exit_error(PARAMETER_PROBLEM, 1057 "Couldn't load target `%s'\n", 1058 name); 1059 } else if (tryload == LOAD_MUST_SUCCEED) 1060 exit_error(PARAMETER_PROBLEM, 1061 "Couldn't load target `%s':%s\n", 1062 name, dlerror()); 1063 } 1064#else 1065 if (ptr && !ptr->loaded) { 1066 if (tryload != DONT_LOAD) 1067 ptr->loaded = 1; 1068 else 1069 ptr = NULL; 1070 } 1071 if(!ptr && (tryload == LOAD_MUST_SUCCEED)) { 1072 exit_error(PARAMETER_PROBLEM, 1073 "Couldn't find target `%s'\n", name); 1074 } 1075#endif 1076 1077 if (ptr) 1078 ptr->used = 1; 1079 1080 return ptr; 1081} 1082 1083static struct option * 1084merge_options(struct option *oldopts, const struct option *newopts, 1085 unsigned int *option_offset) 1086{ 1087 unsigned int num_old, num_new, i; 1088 struct option *merge; 1089 1090 for (num_old = 0; oldopts[num_old].name; num_old++); 1091 for (num_new = 0; newopts[num_new].name; num_new++); 1092 1093 global_option_offset += OPTION_OFFSET; 1094 *option_offset = global_option_offset; 1095 1096 merge = malloc(sizeof(struct option) * (num_new + num_old + 1)); 1097 memcpy(merge, oldopts, num_old * sizeof(struct option)); 1098 free_opts(0); /* Release previous options merged if any */ 1099 for (i = 0; i < num_new; i++) { 1100 merge[num_old + i] = newopts[i]; 1101 merge[num_old + i].val += *option_offset; 1102 } 1103 memset(merge + num_old + num_new, 0, sizeof(struct option)); 1104 1105 return merge; 1106} 1107 1108static int compatible_revision(const char *name, u_int8_t revision, int opt) 1109{ 1110 struct ip6t_get_revision rev; 1111 socklen_t s = sizeof(rev); 1112 int max_rev, sockfd; 1113 1114 sockfd = socket(AF_INET6, SOCK_RAW, IPPROTO_RAW); 1115 if (sockfd < 0) { 1116 fprintf(stderr, "Could not open socket to kernel: %s\n", 1117 strerror(errno)); 1118 exit(1); 1119 } 1120 1121 strcpy(rev.name, name); 1122 rev.revision = revision; 1123 1124 load_ip6tables_ko(modprobe); 1125 1126 max_rev = getsockopt(sockfd, IPPROTO_IPV6, opt, &rev, &s); 1127 if (max_rev < 0) { 1128 /* Definitely don't support this? */ 1129 if (errno == EPROTONOSUPPORT) { 1130 close(sockfd); 1131 return 0; 1132 } else if (errno == ENOPROTOOPT) { 1133 close(sockfd); 1134 /* Assume only revision 0 support (old kernel) */ 1135 return (revision == 0); 1136 } else { 1137 fprintf(stderr, "getsockopt failed strangely: %s\n", 1138 strerror(errno)); 1139 exit(1); 1140 } 1141 } 1142 close(sockfd); 1143 return 1; 1144} 1145 1146static int compatible_match_revision(const char *name, u_int8_t revision) 1147{ 1148 return compatible_revision(name, revision, IP6T_SO_GET_REVISION_MATCH); 1149} 1150 1151void 1152register_match6(struct ip6tables_match *me) 1153{ 1154 struct ip6tables_match **i, *old; 1155 1156 if (strcmp(me->version, program_version) != 0) { 1157 fprintf(stderr, "%s: match `%s' v%s (I'm v%s).\n", 1158 program_name, me->name, me->version, program_version); 1159 exit(1); 1160 } 1161 1162 /* Revision field stole a char from name. */ 1163 if (strlen(me->name) >= IP6T_FUNCTION_MAXNAMELEN-1) { 1164 fprintf(stderr, "%s: target `%s' has invalid name\n", 1165 program_name, me->name); 1166 exit(1); 1167 } 1168 1169 old = find_match(me->name, DURING_LOAD, NULL); 1170 if (old) { 1171 if (old->revision == me->revision) { 1172 fprintf(stderr, 1173 "%s: match `%s' already registered.\n", 1174 program_name, me->name); 1175 exit(1); 1176 } 1177 1178 /* Now we have two (or more) options, check compatibility. */ 1179 if (compatible_match_revision(old->name, old->revision) 1180 && old->revision > me->revision) 1181 return; 1182 1183 /* Replace if compatible. */ 1184 if (!compatible_match_revision(me->name, me->revision)) 1185 return; 1186 1187 /* Delete old one. */ 1188 for (i = &ip6tables_matches; *i!=old; i = &(*i)->next); 1189 *i = old->next; 1190 } 1191 1192 if (me->size != IP6T_ALIGN(me->size)) { 1193 fprintf(stderr, "%s: match `%s' has invalid size %u.\n", 1194 program_name, me->name, (unsigned int)me->size); 1195 exit(1); 1196 } 1197 1198 /* Append to list. */ 1199 for (i = &ip6tables_matches; *i; i = &(*i)->next); 1200 me->next = NULL; 1201 *i = me; 1202 1203 me->m = NULL; 1204 me->mflags = 0; 1205} 1206 1207void 1208register_target6(struct ip6tables_target *me) 1209{ 1210 if (strcmp(me->version, program_version) != 0) { 1211 fprintf(stderr, "%s: target `%s' v%s (I'm v%s).\n", 1212 program_name, me->name, me->version, program_version); 1213 exit(1); 1214 } 1215 1216 if (find_target(me->name, DURING_LOAD)) { 1217 fprintf(stderr, "%s: target `%s' already registered.\n", 1218 program_name, me->name); 1219 exit(1); 1220 } 1221 1222 if (me->size != IP6T_ALIGN(me->size)) { 1223 fprintf(stderr, "%s: target `%s' has invalid size %u.\n", 1224 program_name, me->name, (unsigned int)me->size); 1225 exit(1); 1226 } 1227 1228 /* Prepend to list. */ 1229 me->next = ip6tables_targets; 1230 ip6tables_targets = me; 1231 me->t = NULL; 1232 me->tflags = 0; 1233} 1234 1235static void 1236print_num(u_int64_t number, unsigned int format) 1237{ 1238 if (format & FMT_KILOMEGAGIGA) { 1239 if (number > 99999) { 1240 number = (number + 500) / 1000; 1241 if (number > 9999) { 1242 number = (number + 500) / 1000; 1243 if (number > 9999) { 1244 number = (number + 500) / 1000; 1245 if (number > 9999) { 1246 number = (number + 500) / 1000; 1247 printf(FMT("%4lluT ","%lluT "), (unsigned long long)number); 1248 } 1249 else printf(FMT("%4lluG ","%lluG "), (unsigned long long)number); 1250 } 1251 else printf(FMT("%4lluM ","%lluM "), (unsigned long long)number); 1252 } else 1253 printf(FMT("%4lluK ","%lluK "), (unsigned long long)number); 1254 } else 1255 printf(FMT("%5llu ","%llu "), (unsigned long long)number); 1256 } else 1257 printf(FMT("%8llu ","%llu "), (unsigned long long)number); 1258} 1259 1260 1261static void 1262print_header(unsigned int format, const char *chain, ip6tc_handle_t *handle) 1263{ 1264 struct ip6t_counters counters; 1265 const char *pol = ip6tc_get_policy(chain, &counters, handle); 1266 printf("Chain %s", chain); 1267 if (pol) { 1268 printf(" (policy %s", pol); 1269 if (!(format & FMT_NOCOUNTS)) { 1270 fputc(' ', stdout); 1271 print_num(counters.pcnt, (format|FMT_NOTABLE)); 1272 fputs("packets, ", stdout); 1273 print_num(counters.bcnt, (format|FMT_NOTABLE)); 1274 fputs("bytes", stdout); 1275 } 1276 printf(")\n"); 1277 } else { 1278 unsigned int refs; 1279 if (!ip6tc_get_references(&refs, chain, handle)) 1280 printf(" (ERROR obtaining refs)\n"); 1281 else 1282 printf(" (%u references)\n", refs); 1283 } 1284 1285 if (format & FMT_LINENUMBERS) 1286 printf(FMT("%-4s ", "%s "), "num"); 1287 if (!(format & FMT_NOCOUNTS)) { 1288 if (format & FMT_KILOMEGAGIGA) { 1289 printf(FMT("%5s ","%s "), "pkts"); 1290 printf(FMT("%5s ","%s "), "bytes"); 1291 } else { 1292 printf(FMT("%8s ","%s "), "pkts"); 1293 printf(FMT("%10s ","%s "), "bytes"); 1294 } 1295 } 1296 if (!(format & FMT_NOTARGET)) 1297 printf(FMT("%-9s ","%s "), "target"); 1298 fputs(" prot ", stdout); 1299 if (format & FMT_OPTIONS) 1300 fputs("opt", stdout); 1301 if (format & FMT_VIA) { 1302 printf(FMT(" %-6s ","%s "), "in"); 1303 printf(FMT("%-6s ","%s "), "out"); 1304 } 1305 printf(FMT(" %-19s ","%s "), "source"); 1306 printf(FMT(" %-19s "," %s "), "destination"); 1307 printf("\n"); 1308} 1309 1310 1311static int 1312print_match(const struct ip6t_entry_match *m, 1313 const struct ip6t_ip6 *ip, 1314 int numeric) 1315{ 1316 struct ip6tables_match *match = find_match(m->u.user.name, TRY_LOAD, NULL); 1317 1318 if (match) { 1319 if (match->print) 1320 match->print(ip, m, numeric); 1321 else 1322 printf("%s ", match->name); 1323 } else { 1324 if (m->u.user.name[0]) 1325 printf("UNKNOWN match `%s' ", m->u.user.name); 1326 } 1327 /* Don't stop iterating. */ 1328 return 0; 1329} 1330 1331/* e is called `fw' here for hysterical raisins */ 1332static void 1333print_firewall(const struct ip6t_entry *fw, 1334 const char *targname, 1335 unsigned int num, 1336 unsigned int format, 1337 const ip6tc_handle_t handle) 1338{ 1339 struct ip6tables_target *target = NULL; 1340 const struct ip6t_entry_target *t; 1341 u_int8_t flags; 1342 char buf[BUFSIZ]; 1343 1344 if (!ip6tc_is_chain(targname, handle)) 1345 target = find_target(targname, TRY_LOAD); 1346 else 1347 target = find_target(IP6T_STANDARD_TARGET, LOAD_MUST_SUCCEED); 1348 1349 t = ip6t_get_target((struct ip6t_entry *)fw); 1350 flags = fw->ipv6.flags; 1351 1352 if (format & FMT_LINENUMBERS) 1353 printf(FMT("%-4u ", "%u "), num+1); 1354 1355 if (!(format & FMT_NOCOUNTS)) { 1356 print_num(fw->counters.pcnt, format); 1357 print_num(fw->counters.bcnt, format); 1358 } 1359 1360 if (!(format & FMT_NOTARGET)) 1361 printf(FMT("%-9s ", "%s "), targname); 1362 1363 fputc(fw->ipv6.invflags & IP6T_INV_PROTO ? '!' : ' ', stdout); 1364 { 1365 char *pname = proto_to_name(fw->ipv6.proto, format&FMT_NUMERIC); 1366 if (pname) 1367 printf(FMT("%-5s", "%s "), pname); 1368 else 1369 printf(FMT("%-5hu", "%hu "), fw->ipv6.proto); 1370 } 1371 1372 if (format & FMT_OPTIONS) { 1373 if (format & FMT_NOTABLE) 1374 fputs("opt ", stdout); 1375 fputc(' ', stdout); /* Invert flag of FRAG */ 1376 fputc(' ', stdout); /* -f */ 1377 fputc(' ', stdout); 1378 } 1379 1380 if (format & FMT_VIA) { 1381 char iface[IFNAMSIZ+2]; 1382 1383 if (fw->ipv6.invflags & IP6T_INV_VIA_IN) { 1384 iface[0] = '!'; 1385 iface[1] = '\0'; 1386 } 1387 else iface[0] = '\0'; 1388 1389 if (fw->ipv6.iniface[0] != '\0') { 1390 strcat(iface, fw->ipv6.iniface); 1391 } 1392 else if (format & FMT_NUMERIC) strcat(iface, "*"); 1393 else strcat(iface, "any"); 1394 printf(FMT(" %-6s ","in %s "), iface); 1395 1396 if (fw->ipv6.invflags & IP6T_INV_VIA_OUT) { 1397 iface[0] = '!'; 1398 iface[1] = '\0'; 1399 } 1400 else iface[0] = '\0'; 1401 1402 if (fw->ipv6.outiface[0] != '\0') { 1403 strcat(iface, fw->ipv6.outiface); 1404 } 1405 else if (format & FMT_NUMERIC) strcat(iface, "*"); 1406 else strcat(iface, "any"); 1407 printf(FMT("%-6s ","out %s "), iface); 1408 } 1409 1410 fputc(fw->ipv6.invflags & IP6T_INV_SRCIP ? '!' : ' ', stdout); 1411 if (!memcmp(&fw->ipv6.smsk, &in6addr_any, sizeof in6addr_any) 1412 && !(format & FMT_NUMERIC)) 1413 printf(FMT("%-19s ","%s "), "anywhere"); 1414 else { 1415 if (format & FMT_NUMERIC) 1416 sprintf(buf, "%s", addr_to_numeric(&(fw->ipv6.src))); 1417 else 1418 sprintf(buf, "%s", addr_to_anyname(&(fw->ipv6.src))); 1419 strcat(buf, mask_to_numeric(&(fw->ipv6.smsk))); 1420 printf(FMT("%-19s ","%s "), buf); 1421 } 1422 1423 fputc(fw->ipv6.invflags & IP6T_INV_DSTIP ? '!' : ' ', stdout); 1424 if (!memcmp(&fw->ipv6.dmsk, &in6addr_any, sizeof in6addr_any) 1425 && !(format & FMT_NUMERIC)) 1426 printf(FMT("%-19s","-> %s"), "anywhere"); 1427 else { 1428 if (format & FMT_NUMERIC) 1429 sprintf(buf, "%s", addr_to_numeric(&(fw->ipv6.dst))); 1430 else 1431 sprintf(buf, "%s", addr_to_anyname(&(fw->ipv6.dst))); 1432 strcat(buf, mask_to_numeric(&(fw->ipv6.dmsk))); 1433 printf(FMT("%-19s","-> %s"), buf); 1434 } 1435 1436 if (format & FMT_NOTABLE) 1437 fputs(" ", stdout); 1438 1439 IP6T_MATCH_ITERATE(fw, print_match, &fw->ipv6, format & FMT_NUMERIC); 1440 1441 if (target) { 1442 if (target->print) 1443 /* Print the target information. */ 1444 target->print(&fw->ipv6, t, format & FMT_NUMERIC); 1445 } else if (t->u.target_size != sizeof(*t)) 1446 printf("[%u bytes of unknown target data] ", 1447 (unsigned int)(t->u.target_size - sizeof(*t))); 1448 1449 if (!(format & FMT_NONEWLINE)) 1450 fputc('\n', stdout); 1451} 1452 1453static void 1454print_firewall_line(const struct ip6t_entry *fw, 1455 const ip6tc_handle_t h) 1456{ 1457 struct ip6t_entry_target *t; 1458 1459 t = ip6t_get_target((struct ip6t_entry *)fw); 1460 print_firewall(fw, t->u.user.name, 0, FMT_PRINT_RULE, h); 1461} 1462 1463static int 1464append_entry(const ip6t_chainlabel chain, 1465 struct ip6t_entry *fw, 1466 unsigned int nsaddrs, 1467 const struct in6_addr saddrs[], 1468 unsigned int ndaddrs, 1469 const struct in6_addr daddrs[], 1470 int verbose, 1471 ip6tc_handle_t *handle) 1472{ 1473 unsigned int i, j; 1474 int ret = 1; 1475 1476 for (i = 0; i < nsaddrs; i++) { 1477 fw->ipv6.src = saddrs[i]; 1478 for (j = 0; j < ndaddrs; j++) { 1479 fw->ipv6.dst = daddrs[j]; 1480 if (verbose) 1481 print_firewall_line(fw, *handle); 1482 ret &= ip6tc_append_entry(chain, fw, handle); 1483 } 1484 } 1485 1486 return ret; 1487} 1488 1489static int 1490replace_entry(const ip6t_chainlabel chain, 1491 struct ip6t_entry *fw, 1492 unsigned int rulenum, 1493 const struct in6_addr *saddr, 1494 const struct in6_addr *daddr, 1495 int verbose, 1496 ip6tc_handle_t *handle) 1497{ 1498 fw->ipv6.src = *saddr; 1499 fw->ipv6.dst = *daddr; 1500 1501 if (verbose) 1502 print_firewall_line(fw, *handle); 1503 return ip6tc_replace_entry(chain, fw, rulenum, handle); 1504} 1505 1506static int 1507insert_entry(const ip6t_chainlabel chain, 1508 struct ip6t_entry *fw, 1509 unsigned int rulenum, 1510 unsigned int nsaddrs, 1511 const struct in6_addr saddrs[], 1512 unsigned int ndaddrs, 1513 const struct in6_addr daddrs[], 1514 int verbose, 1515 ip6tc_handle_t *handle) 1516{ 1517 unsigned int i, j; 1518 int ret = 1; 1519 1520 for (i = 0; i < nsaddrs; i++) { 1521 fw->ipv6.src = saddrs[i]; 1522 for (j = 0; j < ndaddrs; j++) { 1523 fw->ipv6.dst = daddrs[j]; 1524 if (verbose) 1525 print_firewall_line(fw, *handle); 1526 ret &= ip6tc_insert_entry(chain, fw, rulenum, handle); 1527 } 1528 } 1529 1530 return ret; 1531} 1532 1533static unsigned char * 1534make_delete_mask(struct ip6t_entry *fw, struct ip6tables_rule_match *matches) 1535{ 1536 /* Establish mask for comparison */ 1537 unsigned int size; 1538 struct ip6tables_rule_match *matchp; 1539 unsigned char *mask, *mptr; 1540 1541 size = sizeof(struct ip6t_entry); 1542 for (matchp = matches; matchp; matchp = matchp->next) 1543 size += IP6T_ALIGN(sizeof(struct ip6t_entry_match)) + matchp->match->size; 1544 1545 mask = fw_calloc(1, size 1546 + IP6T_ALIGN(sizeof(struct ip6t_entry_target)) 1547 + ip6tables_targets->size); 1548 1549 memset(mask, 0xFF, sizeof(struct ip6t_entry)); 1550 mptr = mask + sizeof(struct ip6t_entry); 1551 1552 for (matchp = matches; matchp; matchp = matchp->next) { 1553 memset(mptr, 0xFF, 1554 IP6T_ALIGN(sizeof(struct ip6t_entry_match)) 1555 + matchp->match->userspacesize); 1556 mptr += IP6T_ALIGN(sizeof(struct ip6t_entry_match)) + matchp->match->size; 1557 } 1558 1559 memset(mptr, 0xFF, 1560 IP6T_ALIGN(sizeof(struct ip6t_entry_target)) 1561 + ip6tables_targets->userspacesize); 1562 1563 return mask; 1564} 1565 1566static int 1567delete_entry(const ip6t_chainlabel chain, 1568 struct ip6t_entry *fw, 1569 unsigned int nsaddrs, 1570 const struct in6_addr saddrs[], 1571 unsigned int ndaddrs, 1572 const struct in6_addr daddrs[], 1573 int verbose, 1574 ip6tc_handle_t *handle, 1575 struct ip6tables_rule_match *matches) 1576{ 1577 unsigned int i, j; 1578 int ret = 1; 1579 unsigned char *mask; 1580 1581 mask = make_delete_mask(fw, matches); 1582 for (i = 0; i < nsaddrs; i++) { 1583 fw->ipv6.src = saddrs[i]; 1584 for (j = 0; j < ndaddrs; j++) { 1585 fw->ipv6.dst = daddrs[j]; 1586 if (verbose) 1587 print_firewall_line(fw, *handle); 1588 ret &= ip6tc_delete_entry(chain, fw, mask, handle); 1589 } 1590 } 1591 free(mask); 1592 1593 return ret; 1594} 1595 1596int 1597for_each_chain(int (*fn)(const ip6t_chainlabel, int, ip6tc_handle_t *), 1598 int verbose, int builtinstoo, ip6tc_handle_t *handle) 1599{ 1600 int ret = 1; 1601 const char *chain; 1602 char *chains; 1603 unsigned int i, chaincount = 0; 1604 1605 chain = ip6tc_first_chain(handle); 1606 while (chain) { 1607 chaincount++; 1608 chain = ip6tc_next_chain(handle); 1609 } 1610 1611 chains = fw_malloc(sizeof(ip6t_chainlabel) * chaincount); 1612 i = 0; 1613 chain = ip6tc_first_chain(handle); 1614 while (chain) { 1615 strcpy(chains + i*sizeof(ip6t_chainlabel), chain); 1616 i++; 1617 chain = ip6tc_next_chain(handle); 1618 } 1619 1620 for (i = 0; i < chaincount; i++) { 1621 if (!builtinstoo 1622 && ip6tc_builtin(chains + i*sizeof(ip6t_chainlabel), 1623 *handle) == 1) 1624 continue; 1625 ret &= fn(chains + i*sizeof(ip6t_chainlabel), verbose, handle); 1626 } 1627 1628 free(chains); 1629 return ret; 1630} 1631 1632int 1633flush_entries(const ip6t_chainlabel chain, int verbose, 1634 ip6tc_handle_t *handle) 1635{ 1636 if (!chain) 1637 return for_each_chain(flush_entries, verbose, 1, handle); 1638 1639 if (verbose) 1640 fprintf(stdout, "Flushing chain `%s'\n", chain); 1641 return ip6tc_flush_entries(chain, handle); 1642} 1643 1644static int 1645zero_entries(const ip6t_chainlabel chain, int verbose, 1646 ip6tc_handle_t *handle) 1647{ 1648 if (!chain) 1649 return for_each_chain(zero_entries, verbose, 1, handle); 1650 1651 if (verbose) 1652 fprintf(stdout, "Zeroing chain `%s'\n", chain); 1653 return ip6tc_zero_entries(chain, handle); 1654} 1655 1656int 1657delete_chain(const ip6t_chainlabel chain, int verbose, 1658 ip6tc_handle_t *handle) 1659{ 1660 if (!chain) 1661 return for_each_chain(delete_chain, verbose, 0, handle); 1662 1663 if (verbose) 1664 fprintf(stdout, "Deleting chain `%s'\n", chain); 1665 return ip6tc_delete_chain(chain, handle); 1666} 1667 1668static int 1669list_entries(const ip6t_chainlabel chain, int verbose, int numeric, 1670 int expanded, int linenumbers, ip6tc_handle_t *handle) 1671{ 1672 int found = 0; 1673 unsigned int format; 1674 const char *this; 1675 1676 format = FMT_OPTIONS; 1677 if (!verbose) 1678 format |= FMT_NOCOUNTS; 1679 else 1680 format |= FMT_VIA; 1681 1682 if (numeric) 1683 format |= FMT_NUMERIC; 1684 1685 if (!expanded) 1686 format |= FMT_KILOMEGAGIGA; 1687 1688 if (linenumbers) 1689 format |= FMT_LINENUMBERS; 1690 1691 for (this = ip6tc_first_chain(handle); 1692 this; 1693 this = ip6tc_next_chain(handle)) { 1694 const struct ip6t_entry *i; 1695 unsigned int num; 1696 1697 if (chain && strcmp(chain, this) != 0) 1698 continue; 1699 1700 if (found) printf("\n"); 1701 1702 print_header(format, this, handle); 1703 i = ip6tc_first_rule(this, handle); 1704 1705 num = 0; 1706 while (i) { 1707 print_firewall(i, 1708 ip6tc_get_target(i, handle), 1709 num++, 1710 format, 1711 *handle); 1712 i = ip6tc_next_rule(i, handle); 1713 } 1714 found = 1; 1715 } 1716 1717 errno = ENOENT; 1718 return found; 1719} 1720 1721static char *get_modprobe(void) 1722{ 1723 int procfile; 1724 char *ret; 1725 1726#define PROCFILE_BUFSIZ 1024 1727 procfile = open(PROC_SYS_MODPROBE, O_RDONLY); 1728 if (procfile < 0) 1729 return NULL; 1730 1731 ret = malloc(PROCFILE_BUFSIZ); 1732 if (ret) { 1733 memset(ret, 0, PROCFILE_BUFSIZ); 1734 switch (read(procfile, ret, PROCFILE_BUFSIZ)) { 1735 case -1: goto fail; 1736 case PROCFILE_BUFSIZ: goto fail; /* Partial read. Wierd */ 1737 } 1738 if (ret[strlen(ret)-1]=='\n') 1739 ret[strlen(ret)-1]=0; 1740 close(procfile); 1741 return ret; 1742 } 1743 fail: 1744 free(ret); 1745 close(procfile); 1746 return NULL; 1747} 1748 1749int ip6tables_insmod(const char *modname, const char *modprobe) 1750{ 1751 char *buf = NULL; 1752 char *argv[3]; 1753 int status; 1754 1755 /* If they don't explicitly set it, read out of kernel */ 1756 if (!modprobe) { 1757 buf = get_modprobe(); 1758 if (!buf) 1759 return -1; 1760 modprobe = buf; 1761 } 1762 1763 switch (fork()) { 1764 case 0: 1765 argv[0] = (char *)modprobe; 1766 argv[1] = (char *)modname; 1767 argv[2] = NULL; 1768 execv(argv[0], argv); 1769 1770 /* not usually reached */ 1771 exit(1); 1772 case -1: 1773 return -1; 1774 1775 default: /* parent */ 1776 wait(&status); 1777 } 1778 1779 free(buf); 1780 if (WIFEXITED(status) && WEXITSTATUS(status) == 0) 1781 return 0; 1782 return -1; 1783} 1784 1785int load_ip6tables_ko(const char *modprobe) 1786{ 1787 static int loaded = 0; 1788 static int ret = -1; 1789 1790 if (!loaded) { 1791 ret = ip6tables_insmod("ip6_tables", modprobe); 1792 loaded = 1; 1793 } 1794 1795 return ret; 1796} 1797 1798static struct ip6t_entry * 1799generate_entry(const struct ip6t_entry *fw, 1800 struct ip6tables_rule_match *matches, 1801 struct ip6t_entry_target *target) 1802{ 1803 unsigned int size; 1804 struct ip6tables_rule_match *matchp; 1805 struct ip6t_entry *e; 1806 1807 size = sizeof(struct ip6t_entry); 1808 for (matchp = matches; matchp; matchp = matchp->next) 1809 size += matchp->match->m->u.match_size; 1810 1811 e = fw_malloc(size + target->u.target_size); 1812 *e = *fw; 1813 e->target_offset = size; 1814 e->next_offset = size + target->u.target_size; 1815 1816 size = 0; 1817 for (matchp = matches; matchp; matchp = matchp->next) { 1818 memcpy(e->elems + size, matchp->match->m, matchp->match->m->u.match_size); 1819 size += matchp->match->m->u.match_size; 1820 } 1821 memcpy(e->elems + size, target, target->u.target_size); 1822 1823 return e; 1824} 1825 1826void clear_rule_matches(struct ip6tables_rule_match **matches) 1827{ 1828 struct ip6tables_rule_match *matchp, *tmp; 1829 1830 for (matchp = *matches; matchp;) { 1831 tmp = matchp->next; 1832 if (matchp->match->m) { 1833 free(matchp->match->m); 1834 matchp->match->m = NULL; 1835 } 1836 if (matchp->match == matchp->match->next) { 1837 free(matchp->match); 1838 matchp->match = NULL; 1839 } 1840 free(matchp); 1841 matchp = tmp; 1842 } 1843 1844 *matches = NULL; 1845} 1846 1847static void set_revision(char *name, u_int8_t revision) 1848{ 1849 /* Old kernel sources don't have ".revision" field, 1850 but we stole a byte from name. */ 1851 name[IP6T_FUNCTION_MAXNAMELEN - 2] = '\0'; 1852 name[IP6T_FUNCTION_MAXNAMELEN - 1] = revision; 1853} 1854 1855int do_command6(int argc, char *argv[], char **table, ip6tc_handle_t *handle) 1856{ 1857 struct ip6t_entry fw, *e = NULL; 1858 int invert = 0; 1859 unsigned int nsaddrs = 0, ndaddrs = 0; 1860 struct in6_addr *saddrs = NULL, *daddrs = NULL; 1861 1862 int c, verbose = 0; 1863 const char *chain = NULL; 1864 const char *shostnetworkmask = NULL, *dhostnetworkmask = NULL; 1865 const char *policy = NULL, *newname = NULL; 1866 unsigned int rulenum = 0, options = 0, command = 0; 1867 const char *pcnt = NULL, *bcnt = NULL; 1868 int ret = 1; 1869 struct ip6tables_match *m; 1870 struct ip6tables_rule_match *matches = NULL; 1871 struct ip6tables_rule_match *matchp; 1872 struct ip6tables_target *target = NULL; 1873 struct ip6tables_target *t; 1874 const char *jumpto = ""; 1875 char *protocol = NULL; 1876 int proto_used = 0; 1877 1878 memset(&fw, 0, sizeof(fw)); 1879 1880 /* re-set optind to 0 in case do_command gets called 1881 * a second time */ 1882 optind = 0; 1883 1884 /* clear mflags in case do_command gets called a second time 1885 * (we clear the global list of all matches for security)*/ 1886 for (m = ip6tables_matches; m; m = m->next) 1887 m->mflags = 0; 1888 1889 for (t = ip6tables_targets; t; t = t->next) { 1890 t->tflags = 0; 1891 t->used = 0; 1892 } 1893 1894 /* Suppress error messages: we may add new options if we 1895 demand-load a protocol. */ 1896 opterr = 0; 1897 1898 while ((c = getopt_long(argc, argv, 1899 "-A:D:R:I:L::M:F::Z::N:X::E:P:Vh::o:p:s:d:j:i:bvnt:m:xc:", 1900 opts, NULL)) != -1) { 1901 switch (c) { 1902 /* 1903 * Command selection 1904 */ 1905 case 'A': 1906 add_command(&command, CMD_APPEND, CMD_NONE, 1907 invert); 1908 chain = optarg; 1909 break; 1910 1911 case 'D': 1912 add_command(&command, CMD_DELETE, CMD_NONE, 1913 invert); 1914 chain = optarg; 1915 if (optind < argc && argv[optind][0] != '-' 1916 && argv[optind][0] != '!') { 1917 rulenum = parse_rulenumber(argv[optind++]); 1918 command = CMD_DELETE_NUM; 1919 } 1920 break; 1921 1922 case 'R': 1923 add_command(&command, CMD_REPLACE, CMD_NONE, 1924 invert); 1925 chain = optarg; 1926 if (optind < argc && argv[optind][0] != '-' 1927 && argv[optind][0] != '!') 1928 rulenum = parse_rulenumber(argv[optind++]); 1929 else 1930 exit_error(PARAMETER_PROBLEM, 1931 "-%c requires a rule number", 1932 cmd2char(CMD_REPLACE)); 1933 break; 1934 1935 case 'I': 1936 add_command(&command, CMD_INSERT, CMD_NONE, 1937 invert); 1938 chain = optarg; 1939 if (optind < argc && argv[optind][0] != '-' 1940 && argv[optind][0] != '!') 1941 rulenum = parse_rulenumber(argv[optind++]); 1942 else rulenum = 1; 1943 break; 1944 1945 case 'L': 1946 add_command(&command, CMD_LIST, CMD_ZERO, 1947 invert); 1948 if (optarg) chain = optarg; 1949 else if (optind < argc && argv[optind][0] != '-' 1950 && argv[optind][0] != '!') 1951 chain = argv[optind++]; 1952 break; 1953 1954 case 'F': 1955 add_command(&command, CMD_FLUSH, CMD_NONE, 1956 invert); 1957 if (optarg) chain = optarg; 1958 else if (optind < argc && argv[optind][0] != '-' 1959 && argv[optind][0] != '!') 1960 chain = argv[optind++]; 1961 break; 1962 1963 case 'Z': 1964 add_command(&command, CMD_ZERO, CMD_LIST, 1965 invert); 1966 if (optarg) chain = optarg; 1967 else if (optind < argc && argv[optind][0] != '-' 1968 && argv[optind][0] != '!') 1969 chain = argv[optind++]; 1970 break; 1971 1972 case 'N': 1973 if (optarg && (*optarg == '-' || *optarg == '!')) 1974 exit_error(PARAMETER_PROBLEM, 1975 "chain name not allowed to start " 1976 "with `%c'\n", *optarg); 1977 if (find_target(optarg, TRY_LOAD)) 1978 exit_error(PARAMETER_PROBLEM, 1979 "chain name may not clash " 1980 "with target name\n"); 1981 add_command(&command, CMD_NEW_CHAIN, CMD_NONE, 1982 invert); 1983 chain = optarg; 1984 break; 1985 1986 case 'X': 1987 add_command(&command, CMD_DELETE_CHAIN, CMD_NONE, 1988 invert); 1989 if (optarg) chain = optarg; 1990 else if (optind < argc && argv[optind][0] != '-' 1991 && argv[optind][0] != '!') 1992 chain = argv[optind++]; 1993 break; 1994 1995 case 'E': 1996 add_command(&command, CMD_RENAME_CHAIN, CMD_NONE, 1997 invert); 1998 chain = optarg; 1999 if (optind < argc && argv[optind][0] != '-' 2000 && argv[optind][0] != '!') 2001 newname = argv[optind++]; 2002 else 2003 exit_error(PARAMETER_PROBLEM, 2004 "-%c requires old-chain-name and " 2005 "new-chain-name", 2006 cmd2char(CMD_RENAME_CHAIN)); 2007 break; 2008 2009 case 'P': 2010 add_command(&command, CMD_SET_POLICY, CMD_NONE, 2011 invert); 2012 chain = optarg; 2013 if (optind < argc && argv[optind][0] != '-' 2014 && argv[optind][0] != '!') 2015 policy = argv[optind++]; 2016 else 2017 exit_error(PARAMETER_PROBLEM, 2018 "-%c requires a chain and a policy", 2019 cmd2char(CMD_SET_POLICY)); 2020 break; 2021 2022 case 'h': 2023 if (!optarg) 2024 optarg = argv[optind]; 2025 2026 /* ip6tables -p icmp -h */ 2027 if (!matches && protocol) 2028 find_match(protocol, TRY_LOAD, &matches); 2029 2030 exit_printhelp(matches); 2031 2032 /* 2033 * Option selection 2034 */ 2035 case 'p': 2036 check_inverse(optarg, &invert, &optind, argc); 2037 set_option(&options, OPT_PROTOCOL, &fw.ipv6.invflags, 2038 invert); 2039 2040 /* Canonicalize into lower case */ 2041 for (protocol = argv[optind-1]; *protocol; protocol++) 2042 *protocol = tolower(*protocol); 2043 2044 protocol = argv[optind-1]; 2045 fw.ipv6.proto = parse_protocol(protocol); 2046 fw.ipv6.flags |= IP6T_F_PROTO; 2047 2048 if (fw.ipv6.proto == 0 2049 && (fw.ipv6.invflags & IP6T_INV_PROTO)) 2050 exit_error(PARAMETER_PROBLEM, 2051 "rule would never match protocol"); 2052 2053 if (fw.ipv6.proto != IPPROTO_ESP && 2054 is_exthdr(fw.ipv6.proto)) 2055 printf("Warning: never matched protocol: %s. " 2056 "use exension match instead.", protocol); 2057 break; 2058 2059 case 's': 2060 check_inverse(optarg, &invert, &optind, argc); 2061 set_option(&options, OPT_SOURCE, &fw.ipv6.invflags, 2062 invert); 2063 shostnetworkmask = argv[optind-1]; 2064 break; 2065 2066 case 'd': 2067 check_inverse(optarg, &invert, &optind, argc); 2068 set_option(&options, OPT_DESTINATION, &fw.ipv6.invflags, 2069 invert); 2070 dhostnetworkmask = argv[optind-1]; 2071 break; 2072 2073 case 'j': 2074 set_option(&options, OPT_JUMP, &fw.ipv6.invflags, 2075 invert); 2076 jumpto = parse_target(optarg); 2077 /* TRY_LOAD (may be chain name) */ 2078 target = find_target(jumpto, TRY_LOAD); 2079 2080 if (target) { 2081 size_t size; 2082 2083 size = IP6T_ALIGN(sizeof(struct ip6t_entry_target)) 2084 + target->size; 2085 2086 target->t = fw_calloc(1, size); 2087 target->t->u.target_size = size; 2088 strcpy(target->t->u.user.name, jumpto); 2089 if (target->init != NULL) 2090 target->init(target->t, &fw.nfcache); 2091 opts = merge_options(opts, target->extra_opts, &target->option_offset); 2092 } 2093 break; 2094 2095 2096 case 'i': 2097 check_inverse(optarg, &invert, &optind, argc); 2098 set_option(&options, OPT_VIANAMEIN, &fw.ipv6.invflags, 2099 invert); 2100 parse_interface(argv[optind-1], 2101 fw.ipv6.iniface, 2102 fw.ipv6.iniface_mask); 2103 break; 2104 2105 case 'o': 2106 check_inverse(optarg, &invert, &optind, argc); 2107 set_option(&options, OPT_VIANAMEOUT, &fw.ipv6.invflags, 2108 invert); 2109 parse_interface(argv[optind-1], 2110 fw.ipv6.outiface, 2111 fw.ipv6.outiface_mask); 2112 break; 2113 2114 case 'v': 2115 if (!verbose) 2116 set_option(&options, OPT_VERBOSE, 2117 &fw.ipv6.invflags, invert); 2118 verbose++; 2119 break; 2120 2121 case 'm': { 2122 size_t size; 2123 2124 if (invert) 2125 exit_error(PARAMETER_PROBLEM, 2126 "unexpected ! flag before --match"); 2127 2128 m = find_match(optarg, LOAD_MUST_SUCCEED, &matches); 2129 size = IP6T_ALIGN(sizeof(struct ip6t_entry_match)) 2130 + m->size; 2131 m->m = fw_calloc(1, size); 2132 m->m->u.match_size = size; 2133 strcpy(m->m->u.user.name, m->name); 2134 set_revision(m->m->u.user.name, m->revision); 2135 if (m->init != NULL) 2136 m->init(m->m, &fw.nfcache); 2137 if (m != m->next) 2138 /* Merge options for non-cloned matches */ 2139 opts = merge_options(opts, m->extra_opts, &m->option_offset); 2140 } 2141 break; 2142 2143 case 'n': 2144 set_option(&options, OPT_NUMERIC, &fw.ipv6.invflags, 2145 invert); 2146 break; 2147 2148 case 't': 2149 if (invert) 2150 exit_error(PARAMETER_PROBLEM, 2151 "unexpected ! flag before --table"); 2152 *table = argv[optind-1]; 2153 break; 2154 2155 case 'x': 2156 set_option(&options, OPT_EXPANDED, &fw.ipv6.invflags, 2157 invert); 2158 break; 2159 2160 case 'V': 2161 if (invert) 2162 printf("Not %s ;-)\n", program_version); 2163 else 2164 printf("%s v%s\n", 2165 program_name, program_version); 2166 exit(0); 2167 2168 case '0': 2169 set_option(&options, OPT_LINENUMBERS, &fw.ipv6.invflags, 2170 invert); 2171 break; 2172 2173 case 'M': 2174 modprobe = optarg; 2175 break; 2176 2177 case 'c': 2178 2179 set_option(&options, OPT_COUNTERS, &fw.ipv6.invflags, 2180 invert); 2181 pcnt = optarg; 2182 if (optind < argc && argv[optind][0] != '-' 2183 && argv[optind][0] != '!') 2184 bcnt = argv[optind++]; 2185 else 2186 exit_error(PARAMETER_PROBLEM, 2187 "-%c requires packet and byte counter", 2188 opt2char(OPT_COUNTERS)); 2189 2190 if (sscanf(pcnt, "%llu", (unsigned long long *)&fw.counters.pcnt) != 1) 2191 exit_error(PARAMETER_PROBLEM, 2192 "-%c packet counter not numeric", 2193 opt2char(OPT_COUNTERS)); 2194 2195 if (sscanf(bcnt, "%llu", (unsigned long long *)&fw.counters.bcnt) != 1) 2196 exit_error(PARAMETER_PROBLEM, 2197 "-%c byte counter not numeric", 2198 opt2char(OPT_COUNTERS)); 2199 2200 break; 2201 2202 2203 case 1: /* non option */ 2204 if (optarg[0] == '!' && optarg[1] == '\0') { 2205 if (invert) 2206 exit_error(PARAMETER_PROBLEM, 2207 "multiple consecutive ! not" 2208 " allowed"); 2209 invert = TRUE; 2210 optarg[0] = '\0'; 2211 continue; 2212 } 2213 printf("Bad argument `%s'\n", optarg); 2214 exit_tryhelp(2); 2215 2216 default: 2217 if (!target 2218 || !(target->parse(c - target->option_offset, 2219 argv, invert, 2220 &target->tflags, 2221 &fw, &target->t))) { 2222 for (matchp = matches; matchp; matchp = matchp->next) { 2223 if (matchp->completed) 2224 continue; 2225 if (matchp->match->parse(c - matchp->match->option_offset, 2226 argv, invert, 2227 &matchp->match->mflags, 2228 &fw, 2229 &fw.nfcache, 2230 &matchp->match->m)) 2231 break; 2232 } 2233 m = matchp ? matchp->match : NULL; 2234 2235 /* If you listen carefully, you can 2236 actually hear this code suck. */ 2237 2238 /* some explanations (after four different bugs 2239 * in 3 different releases): If we encounter a 2240 * parameter, that has not been parsed yet, 2241 * it's not an option of an explicitly loaded 2242 * match or a target. However, we support 2243 * implicit loading of the protocol match 2244 * extension. '-p tcp' means 'l4 proto 6' and 2245 * at the same time 'load tcp protocol match on 2246 * demand if we specify --dport'. 2247 * 2248 * To make this work, we need to make sure: 2249 * - the parameter has not been parsed by 2250 * a match (m above) 2251 * - a protocol has been specified 2252 * - the protocol extension has not been 2253 * loaded yet, or is loaded and unused 2254 * [think of ip6tables-restore!] 2255 * - the protocol extension can be successively 2256 * loaded 2257 */ 2258 if (m == NULL 2259 && protocol 2260 && (!find_proto(protocol, DONT_LOAD, 2261 options&OPT_NUMERIC, NULL) 2262 || (find_proto(protocol, DONT_LOAD, 2263 options&OPT_NUMERIC, NULL) 2264 && (proto_used == 0)) 2265 ) 2266 && (m = find_proto(protocol, TRY_LOAD, 2267 options&OPT_NUMERIC, &matches))) { 2268 /* Try loading protocol */ 2269 size_t size; 2270 2271 proto_used = 1; 2272 2273 size = IP6T_ALIGN(sizeof(struct ip6t_entry_match)) 2274 + m->size; 2275 2276 m->m = fw_calloc(1, size); 2277 m->m->u.match_size = size; 2278 strcpy(m->m->u.user.name, m->name); 2279 set_revision(m->m->u.user.name, 2280 m->revision); 2281 if (m->init != NULL) 2282 m->init(m->m, &fw.nfcache); 2283 2284 opts = merge_options(opts, 2285 m->extra_opts, &m->option_offset); 2286 2287 optind--; 2288 continue; 2289 } 2290 2291 if (!m) 2292 exit_error(PARAMETER_PROBLEM, 2293 "Unknown arg `%s'", 2294 argv[optind-1]); 2295 } 2296 } 2297 invert = FALSE; 2298 } 2299 2300 for (matchp = matches; matchp; matchp = matchp->next) 2301 matchp->match->final_check(matchp->match->mflags); 2302 2303 if (target) 2304 target->final_check(target->tflags); 2305 2306 /* Fix me: must put inverse options checking here --MN */ 2307 2308 if (optind < argc) 2309 exit_error(PARAMETER_PROBLEM, 2310 "unknown arguments found on commandline"); 2311 if (!command) 2312 exit_error(PARAMETER_PROBLEM, "no command specified"); 2313 if (invert) 2314 exit_error(PARAMETER_PROBLEM, 2315 "nothing appropriate following !"); 2316 2317 if (command & (CMD_REPLACE | CMD_INSERT | CMD_DELETE | CMD_APPEND)) { 2318 if (!(options & OPT_DESTINATION)) 2319 dhostnetworkmask = "::0/0"; 2320 if (!(options & OPT_SOURCE)) 2321 shostnetworkmask = "::0/0"; 2322 } 2323 2324 if (shostnetworkmask) 2325 parse_hostnetworkmask(shostnetworkmask, &saddrs, 2326 &(fw.ipv6.smsk), &nsaddrs); 2327 2328 if (dhostnetworkmask) 2329 parse_hostnetworkmask(dhostnetworkmask, &daddrs, 2330 &(fw.ipv6.dmsk), &ndaddrs); 2331 2332 if ((nsaddrs > 1 || ndaddrs > 1) && 2333 (fw.ipv6.invflags & (IP6T_INV_SRCIP | IP6T_INV_DSTIP))) 2334 exit_error(PARAMETER_PROBLEM, "! not allowed with multiple" 2335 " source or destination IP addresses"); 2336 2337 if (command == CMD_REPLACE && (nsaddrs != 1 || ndaddrs != 1)) 2338 exit_error(PARAMETER_PROBLEM, "Replacement rule does not " 2339 "specify a unique address"); 2340 2341 generic_opt_check(command, options); 2342 2343 if (chain && strlen(chain) > IP6T_FUNCTION_MAXNAMELEN) 2344 exit_error(PARAMETER_PROBLEM, 2345 "chain name `%s' too long (must be under %i chars)", 2346 chain, IP6T_FUNCTION_MAXNAMELEN); 2347 2348 /* only allocate handle if we weren't called with a handle */ 2349 if (!*handle) 2350 *handle = ip6tc_init(*table); 2351 2352 /* try to insmod the module if iptc_init failed */ 2353 if (!*handle && load_ip6tables_ko(modprobe) != -1) 2354 *handle = ip6tc_init(*table); 2355 2356 if (!*handle) 2357 exit_error(VERSION_PROBLEM, 2358 "can't initialize ip6tables table `%s': %s", 2359 *table, ip6tc_strerror(errno)); 2360 2361 if (command == CMD_APPEND 2362 || command == CMD_DELETE 2363 || command == CMD_INSERT 2364 || command == CMD_REPLACE) { 2365 if (strcmp(chain, "PREROUTING") == 0 2366 || strcmp(chain, "INPUT") == 0) { 2367 /* -o not valid with incoming packets. */ 2368 if (options & OPT_VIANAMEOUT) 2369 exit_error(PARAMETER_PROBLEM, 2370 "Can't use -%c with %s\n", 2371 opt2char(OPT_VIANAMEOUT), 2372 chain); 2373 } 2374 2375 if (strcmp(chain, "POSTROUTING") == 0 2376 || strcmp(chain, "OUTPUT") == 0) { 2377 /* -i not valid with outgoing packets */ 2378 if (options & OPT_VIANAMEIN) 2379 exit_error(PARAMETER_PROBLEM, 2380 "Can't use -%c with %s\n", 2381 opt2char(OPT_VIANAMEIN), 2382 chain); 2383 } 2384 2385 if (target && ip6tc_is_chain(jumpto, *handle)) { 2386 printf("Warning: using chain %s, not extension\n", 2387 jumpto); 2388 2389 if (target->t) 2390 free(target->t); 2391 2392 target = NULL; 2393 } 2394 2395 /* If they didn't specify a target, or it's a chain 2396 name, use standard. */ 2397 if (!target 2398 && (strlen(jumpto) == 0 2399 || ip6tc_is_chain(jumpto, *handle))) { 2400 size_t size; 2401 2402 target = find_target(IP6T_STANDARD_TARGET, 2403 LOAD_MUST_SUCCEED); 2404 2405 size = sizeof(struct ip6t_entry_target) 2406 + target->size; 2407 target->t = fw_calloc(1, size); 2408 target->t->u.target_size = size; 2409 strcpy(target->t->u.user.name, jumpto); 2410 if (target->init != NULL) 2411 target->init(target->t, &fw.nfcache); 2412 } 2413 2414 if (!target) { 2415 /* it is no chain, and we can't load a plugin. 2416 * We cannot know if the plugin is corrupt, non 2417 * existant OR if the user just misspelled a 2418 * chain. */ 2419 find_target(jumpto, LOAD_MUST_SUCCEED); 2420 } else { 2421 e = generate_entry(&fw, matches, target->t); 2422 free(target->t); 2423 } 2424 } 2425 2426 switch (command) { 2427 case CMD_APPEND: 2428 ret = append_entry(chain, e, 2429 nsaddrs, saddrs, ndaddrs, daddrs, 2430 options&OPT_VERBOSE, 2431 handle); 2432 break; 2433 case CMD_DELETE: 2434 ret = delete_entry(chain, e, 2435 nsaddrs, saddrs, ndaddrs, daddrs, 2436 options&OPT_VERBOSE, 2437 handle, matches); 2438 break; 2439 case CMD_DELETE_NUM: 2440 ret = ip6tc_delete_num_entry(chain, rulenum - 1, handle); 2441 break; 2442 case CMD_REPLACE: 2443 ret = replace_entry(chain, e, rulenum - 1, 2444 saddrs, daddrs, options&OPT_VERBOSE, 2445 handle); 2446 break; 2447 case CMD_INSERT: 2448 ret = insert_entry(chain, e, rulenum - 1, 2449 nsaddrs, saddrs, ndaddrs, daddrs, 2450 options&OPT_VERBOSE, 2451 handle); 2452 break; 2453 case CMD_LIST: 2454 ret = list_entries(chain, 2455 options&OPT_VERBOSE, 2456 options&OPT_NUMERIC, 2457 options&OPT_EXPANDED, 2458 options&OPT_LINENUMBERS, 2459 handle); 2460 break; 2461 case CMD_FLUSH: 2462 ret = flush_entries(chain, options&OPT_VERBOSE, handle); 2463 break; 2464 case CMD_ZERO: 2465 ret = zero_entries(chain, options&OPT_VERBOSE, handle); 2466 break; 2467 case CMD_LIST|CMD_ZERO: 2468 ret = list_entries(chain, 2469 options&OPT_VERBOSE, 2470 options&OPT_NUMERIC, 2471 options&OPT_EXPANDED, 2472 options&OPT_LINENUMBERS, 2473 handle); 2474 if (ret) 2475 ret = zero_entries(chain, 2476 options&OPT_VERBOSE, handle); 2477 break; 2478 case CMD_NEW_CHAIN: 2479 ret = ip6tc_create_chain(chain, handle); 2480 break; 2481 case CMD_DELETE_CHAIN: 2482 ret = delete_chain(chain, options&OPT_VERBOSE, handle); 2483 break; 2484 case CMD_RENAME_CHAIN: 2485 ret = ip6tc_rename_chain(chain, newname, handle); 2486 break; 2487 case CMD_SET_POLICY: 2488 ret = ip6tc_set_policy(chain, policy, NULL, handle); 2489 break; 2490 default: 2491 /* We should never reach this... */ 2492 exit_tryhelp(2); 2493 } 2494 2495 if (verbose > 1) 2496 dump_entries6(*handle); 2497 2498 clear_rule_matches(&matches); 2499 2500 if (e != NULL) { 2501 free(e); 2502 e = NULL; 2503 } 2504 2505 for (c = 0; c < nsaddrs; c++) 2506 free(&saddrs[c]); 2507 2508 for (c = 0; c < ndaddrs; c++) 2509 free(&daddrs[c]); 2510 2511 free_opts(1); 2512 2513 return ret; 2514} 2515