ipv6.c revision 248505
1238384Sjkim/* 2238384Sjkim * Copyright (c) 2002-2003 Luigi Rizzo 3238384Sjkim * Copyright (c) 1996 Alex Nash, Paul Traina, Poul-Henning Kamp 4238384Sjkim * Copyright (c) 1994 Ugen J.S.Antsilevich 5238384Sjkim * 6238384Sjkim * Idea and grammar partially left from: 7238384Sjkim * Copyright (c) 1993 Daniel Boulet 8238384Sjkim * 9280304Sjkim * Redistribution and use in source forms, with and without modification, 10238384Sjkim * are permitted provided that this entire comment appears intact. 11238384Sjkim * 12238384Sjkim * Redistribution in binary form may occur without any restrictions. 13238384Sjkim * Obviously, it would be nice if you gave credit where credit is due 14238384Sjkim * but requiring it would be too onerous. 15238384Sjkim * 16238384Sjkim * This software is provided ``AS IS'' without any warranties of any kind. 17238384Sjkim * 18238384Sjkim * NEW command line interface for IP firewall facility 19238384Sjkim * 20238384Sjkim * $FreeBSD: stable/9/sbin/ipfw/ipv6.c 248505 2013-03-19 13:29:01Z melifaro $ 21238384Sjkim * 22238384Sjkim * ipv6 support 23238384Sjkim */ 24238384Sjkim 25238384Sjkim#include <sys/types.h> 26238384Sjkim#include <sys/socket.h> 27238384Sjkim 28238384Sjkim#include "ipfw2.h" 29238384Sjkim 30238384Sjkim#include <err.h> 31238384Sjkim#include <netdb.h> 32238384Sjkim#include <stdio.h> 33238384Sjkim#include <stdlib.h> 34238384Sjkim#include <string.h> 35238384Sjkim#include <sysexits.h> 36238384Sjkim 37238384Sjkim#include <net/if.h> 38238384Sjkim#include <netinet/in.h> 39238384Sjkim#include <netinet/in_systm.h> 40238384Sjkim#include <netinet/ip.h> 41238384Sjkim#include <netinet/icmp6.h> 42238384Sjkim#include <netinet/ip_fw.h> 43238384Sjkim#include <arpa/inet.h> 44238384Sjkim 45238384Sjkim#define CHECK_LENGTH(v, len) do { \ 46238384Sjkim if ((v) < (len)) \ 47238384Sjkim errx(EX_DATAERR, "Rule too long"); \ 48238384Sjkim } while (0) 49238384Sjkim 50238384Sjkimstatic struct _s_x icmp6codes[] = { 51238384Sjkim { "no-route", ICMP6_DST_UNREACH_NOROUTE }, 52238384Sjkim { "admin-prohib", ICMP6_DST_UNREACH_ADMIN }, 53238384Sjkim { "address", ICMP6_DST_UNREACH_ADDR }, 54238384Sjkim { "port", ICMP6_DST_UNREACH_NOPORT }, 55238384Sjkim { NULL, 0 } 56238384Sjkim}; 57238384Sjkim 58238384Sjkimvoid 59238384Sjkimfill_unreach6_code(u_short *codep, char *str) 60238384Sjkim{ 61280304Sjkim int val; 62280304Sjkim char *s; 63280304Sjkim 64280304Sjkim val = strtoul(str, &s, 0); 65238384Sjkim if (s == str || *s != '\0' || val >= 0x100) 66280304Sjkim val = match_token(icmp6codes, str); 67280304Sjkim if (val < 0) 68280304Sjkim errx(EX_DATAERR, "unknown ICMPv6 unreachable code ``%s''", str); 69280304Sjkim *codep = val; 70280304Sjkim return; 71280304Sjkim} 72280304Sjkim 73280304Sjkimvoid 74280304Sjkimprint_unreach6_code(uint16_t code) 75280304Sjkim{ 76280304Sjkim char const *s = match_value(icmp6codes, code); 77280304Sjkim 78238384Sjkim if (s != NULL) 79280304Sjkim printf("unreach6 %s", s); 80280304Sjkim else 81238384Sjkim printf("unreach6 %u", code); 82280304Sjkim} 83238384Sjkim 84280304Sjkim/* 85238384Sjkim * Print the ip address contained in a command. 86280304Sjkim */ 87280304Sjkimvoid 88238384Sjkimprint_ip6(ipfw_insn_ip6 *cmd, char const *s) 89280304Sjkim{ 90238384Sjkim struct hostent *he = NULL; 91280304Sjkim int len = F_LEN((ipfw_insn *) cmd) - 1; 92280304Sjkim struct in6_addr *a = &(cmd->addr6); 93280304Sjkim char trad[255]; 94238384Sjkim 95280304Sjkim printf("%s%s ", cmd->o.len & F_NOT ? " not": "", s); 96280304Sjkim 97238384Sjkim if (cmd->o.opcode == O_IP6_SRC_ME || cmd->o.opcode == O_IP6_DST_ME) { 98280304Sjkim printf("me6"); 99238384Sjkim return; 100280304Sjkim } 101280304Sjkim if (cmd->o.opcode == O_IP6) { 102280304Sjkim printf(" ip6"); 103238384Sjkim return; 104280304Sjkim } 105280304Sjkim 106238384Sjkim /* 107280304Sjkim * len == 4 indicates a single IP, whereas lists of 1 or more 108280304Sjkim * addr/mask pairs have len = (2n+1). We convert len to n so we 109280304Sjkim * use that to count the number of entries. 110238384Sjkim */ 111280304Sjkim 112280304Sjkim for (len = len / 4; len > 0; len -= 2, a += 2) { 113238384Sjkim int mb = /* mask length */ 114280304Sjkim (cmd->o.opcode == O_IP6_SRC || cmd->o.opcode == O_IP6_DST) ? 115280304Sjkim 128 : contigmask((uint8_t *)&(a[1]), 128); 116238384Sjkim 117280304Sjkim if (mb == 128 && co.do_resolv) 118280304Sjkim he = gethostbyaddr((char *)a, sizeof(*a), AF_INET6); 119280304Sjkim if (he != NULL) /* resolved to name */ 120280304Sjkim printf("%s", he->h_name); 121280304Sjkim else if (mb == 0) /* any */ 122280304Sjkim printf("any"); 123238384Sjkim else { /* numeric IP followed by some kind of mask */ 124280304Sjkim if (inet_ntop(AF_INET6, a, trad, sizeof( trad ) ) == NULL) 125280304Sjkim printf("Error ntop in print_ip6\n"); 126280304Sjkim printf("%s", trad ); 127280304Sjkim if (mb < 0) /* XXX not really legal... */ 128280304Sjkim printf(":%s", 129280304Sjkim inet_ntop(AF_INET6, &a[1], trad, sizeof(trad))); 130280304Sjkim else if (mb < 128) 131280304Sjkim printf("/%d", mb); 132280304Sjkim } 133280304Sjkim if (len > 2) 134280304Sjkim printf(","); 135280304Sjkim } 136280304Sjkim} 137280304Sjkim 138280304Sjkimvoid 139280304Sjkimfill_icmp6types(ipfw_insn_icmp6 *cmd, char *av, int cblen) 140280304Sjkim{ 141280304Sjkim uint8_t type; 142280304Sjkim 143280304Sjkim CHECK_LENGTH(cblen, F_INSN_SIZE(ipfw_insn_icmp6)); 144280304Sjkim 145280304Sjkim bzero(cmd, sizeof(*cmd)); 146280304Sjkim while (*av) { 147280304Sjkim if (*av == ',') 148280304Sjkim av++; 149280304Sjkim type = strtoul(av, &av, 0); 150280304Sjkim if (*av != ',' && *av != '\0') 151280304Sjkim errx(EX_DATAERR, "invalid ICMP6 type"); 152238384Sjkim /* 153280304Sjkim * XXX: shouldn't this be 0xFF? I can't see any reason why 154280304Sjkim * we shouldn't be able to filter all possiable values 155238384Sjkim * regardless of the ability of the rest of the kernel to do 156280304Sjkim * anything useful with them. 157280304Sjkim */ 158280304Sjkim if (type > ICMP6_MAXTYPE) 159280304Sjkim errx(EX_DATAERR, "ICMP6 type out of range"); 160280304Sjkim cmd->d[type / 32] |= ( 1 << (type % 32)); 161280304Sjkim } 162280304Sjkim cmd->o.opcode = O_ICMP6TYPE; 163280304Sjkim cmd->o.len |= F_INSN_SIZE(ipfw_insn_icmp6); 164280304Sjkim} 165280304Sjkim 166280304Sjkim 167280304Sjkimvoid 168280304Sjkimprint_icmp6types(ipfw_insn_u32 *cmd) 169280304Sjkim{ 170280304Sjkim int i, j; 171280304Sjkim char sep= ' '; 172280304Sjkim 173238384Sjkim printf(" ip6 icmp6types"); 174280304Sjkim for (i = 0; i < 7; i++) 175280304Sjkim for (j=0; j < 32; ++j) { 176280304Sjkim if ( (cmd->d[i] & (1 << (j))) == 0) 177238384Sjkim continue; 178280304Sjkim printf("%c%d", sep, (i*32 + j)); 179280304Sjkim sep = ','; 180238384Sjkim } 181280304Sjkim} 182280304Sjkim 183280304Sjkimvoid 184238384Sjkimprint_flow6id( ipfw_insn_u32 *cmd) 185280304Sjkim{ 186280304Sjkim uint16_t i, limit = cmd->o.arg1; 187280304Sjkim char sep = ','; 188280304Sjkim 189280304Sjkim printf(" flow-id "); 190280304Sjkim for( i=0; i < limit; ++i) { 191280304Sjkim if (i == limit - 1) 192280304Sjkim sep = ' '; 193238384Sjkim printf("%d%c", cmd->d[i], sep); 194280304Sjkim } 195280304Sjkim} 196280304Sjkim 197238384Sjkim/* structure and define for the extension header in ipv6 */ 198280304Sjkimstatic struct _s_x ext6hdrcodes[] = { 199280304Sjkim { "frag", EXT_FRAGMENT }, 200238384Sjkim { "hopopt", EXT_HOPOPTS }, 201280304Sjkim { "route", EXT_ROUTING }, 202238384Sjkim { "dstopt", EXT_DSTOPTS }, 203280304Sjkim { "ah", EXT_AH }, 204238384Sjkim { "esp", EXT_ESP }, 205 { "rthdr0", EXT_RTHDR0 }, 206 { "rthdr2", EXT_RTHDR2 }, 207 { NULL, 0 } 208}; 209 210/* fills command for the extension header filtering */ 211int 212fill_ext6hdr( ipfw_insn *cmd, char *av) 213{ 214 int tok; 215 char *s = av; 216 217 cmd->arg1 = 0; 218 219 while(s) { 220 av = strsep( &s, ",") ; 221 tok = match_token(ext6hdrcodes, av); 222 switch (tok) { 223 case EXT_FRAGMENT: 224 cmd->arg1 |= EXT_FRAGMENT; 225 break; 226 227 case EXT_HOPOPTS: 228 cmd->arg1 |= EXT_HOPOPTS; 229 break; 230 231 case EXT_ROUTING: 232 cmd->arg1 |= EXT_ROUTING; 233 break; 234 235 case EXT_DSTOPTS: 236 cmd->arg1 |= EXT_DSTOPTS; 237 break; 238 239 case EXT_AH: 240 cmd->arg1 |= EXT_AH; 241 break; 242 243 case EXT_ESP: 244 cmd->arg1 |= EXT_ESP; 245 break; 246 247 case EXT_RTHDR0: 248 cmd->arg1 |= EXT_RTHDR0; 249 break; 250 251 case EXT_RTHDR2: 252 cmd->arg1 |= EXT_RTHDR2; 253 break; 254 255 default: 256 errx( EX_DATAERR, "invalid option for ipv6 exten header" ); 257 break; 258 } 259 } 260 if (cmd->arg1 == 0 ) 261 return 0; 262 cmd->opcode = O_EXT_HDR; 263 cmd->len |= F_INSN_SIZE( ipfw_insn ); 264 return 1; 265} 266 267void 268print_ext6hdr( ipfw_insn *cmd ) 269{ 270 char sep = ' '; 271 272 printf(" extension header:"); 273 if (cmd->arg1 & EXT_FRAGMENT ) { 274 printf("%cfragmentation", sep); 275 sep = ','; 276 } 277 if (cmd->arg1 & EXT_HOPOPTS ) { 278 printf("%chop options", sep); 279 sep = ','; 280 } 281 if (cmd->arg1 & EXT_ROUTING ) { 282 printf("%crouting options", sep); 283 sep = ','; 284 } 285 if (cmd->arg1 & EXT_RTHDR0 ) { 286 printf("%crthdr0", sep); 287 sep = ','; 288 } 289 if (cmd->arg1 & EXT_RTHDR2 ) { 290 printf("%crthdr2", sep); 291 sep = ','; 292 } 293 if (cmd->arg1 & EXT_DSTOPTS ) { 294 printf("%cdestination options", sep); 295 sep = ','; 296 } 297 if (cmd->arg1 & EXT_AH ) { 298 printf("%cauthentication header", sep); 299 sep = ','; 300 } 301 if (cmd->arg1 & EXT_ESP ) { 302 printf("%cencapsulated security payload", sep); 303 } 304} 305 306/* Try to find ipv6 address by hostname */ 307static int 308lookup_host6 (char *host, struct in6_addr *ip6addr) 309{ 310 struct hostent *he; 311 312 if (!inet_pton(AF_INET6, host, ip6addr)) { 313 if ((he = gethostbyname2(host, AF_INET6)) == NULL) 314 return(-1); 315 memcpy(ip6addr, he->h_addr_list[0], sizeof( struct in6_addr)); 316 } 317 return(0); 318} 319 320 321/* 322 * fill the addr and mask fields in the instruction as appropriate from av. 323 * Update length as appropriate. 324 * The following formats are allowed: 325 * any matches any IP6. Actually returns an empty instruction. 326 * me returns O_IP6_*_ME 327 * 328 * 03f1::234:123:0342 single IP6 addres 329 * 03f1::234:123:0342/24 address/mask 330 * 03f1::234:123:0342/24,03f1::234:123:0343/ List of address 331 * 332 * Set of address (as in ipv6) not supported because ipv6 address 333 * are typically random past the initial prefix. 334 * Return 1 on success, 0 on failure. 335 */ 336static int 337fill_ip6(ipfw_insn_ip6 *cmd, char *av, int cblen) 338{ 339 int len = 0; 340 struct in6_addr *d = &(cmd->addr6); 341 /* 342 * Needed for multiple address. 343 * Note d[1] points to struct in6_add r mask6 of cmd 344 */ 345 346 cmd->o.len &= ~F_LEN_MASK; /* zero len */ 347 348 if (strcmp(av, "any") == 0) 349 return (1); 350 351 352 if (strcmp(av, "me") == 0) { /* Set the data for "me" opt*/ 353 cmd->o.len |= F_INSN_SIZE(ipfw_insn); 354 return (1); 355 } 356 357 if (strcmp(av, "me6") == 0) { /* Set the data for "me" opt*/ 358 cmd->o.len |= F_INSN_SIZE(ipfw_insn); 359 return (1); 360 } 361 362 if (strncmp(av, "table(", 6) == 0) { 363 char *p = strchr(av + 6, ','); 364 uint32_t *dm = ((ipfw_insn_u32 *)cmd)->d; 365 366 if (p) 367 *p++ = '\0'; 368 cmd->o.opcode = O_IP_DST_LOOKUP; 369 cmd->o.arg1 = strtoul(av + 6, NULL, 0); 370 if (p) { 371 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32); 372 dm[0] = strtoul(p, NULL, 0); 373 } else 374 cmd->o.len |= F_INSN_SIZE(ipfw_insn); 375 return (1); 376 } 377 378 av = strdup(av); 379 while (av) { 380 /* 381 * After the address we can have '/' indicating a mask, 382 * or ',' indicating another address follows. 383 */ 384 385 char *p; 386 int masklen; 387 char md = '\0'; 388 389 CHECK_LENGTH(cblen, 1 + len + 2 * F_INSN_SIZE(struct in6_addr)); 390 391 if ((p = strpbrk(av, "/,")) ) { 392 md = *p; /* save the separator */ 393 *p = '\0'; /* terminate address string */ 394 p++; /* and skip past it */ 395 } 396 /* now p points to NULL, mask or next entry */ 397 398 /* lookup stores address in *d as a side effect */ 399 if (lookup_host6(av, d) != 0) { 400 /* XXX: failed. Free memory and go */ 401 errx(EX_DATAERR, "bad address \"%s\"", av); 402 } 403 /* next, look at the mask, if any */ 404 masklen = (md == '/') ? atoi(p) : 128; 405 if (masklen > 128 || masklen < 0) 406 errx(EX_DATAERR, "bad width \"%s\''", p); 407 else 408 n2mask(&d[1], masklen); 409 410 APPLY_MASK(d, &d[1]) /* mask base address with mask */ 411 412 /* find next separator */ 413 414 if (md == '/') { /* find separator past the mask */ 415 p = strpbrk(p, ","); 416 if (p != NULL) 417 p++; 418 } 419 av = p; 420 421 /* Check this entry */ 422 if (masklen == 0) { 423 /* 424 * 'any' turns the entire list into a NOP. 425 * 'not any' never matches, so it is removed from the 426 * list unless it is the only item, in which case we 427 * report an error. 428 */ 429 if (cmd->o.len & F_NOT && av == NULL && len == 0) 430 errx(EX_DATAERR, "not any never matches"); 431 continue; 432 } 433 434 /* 435 * A single IP can be stored alone 436 */ 437 if (masklen == 128 && av == NULL && len == 0) { 438 len = F_INSN_SIZE(struct in6_addr); 439 break; 440 } 441 442 /* Update length and pointer to arguments */ 443 len += F_INSN_SIZE(struct in6_addr)*2; 444 d += 2; 445 } /* end while */ 446 447 /* 448 * Total length of the command, remember that 1 is the size of 449 * the base command. 450 */ 451 if (len + 1 > F_LEN_MASK) 452 errx(EX_DATAERR, "address list too long"); 453 cmd->o.len |= len+1; 454 free(av); 455 return (1); 456} 457 458/* 459 * fills command for ipv6 flow-id filtering 460 * note that the 20 bit flow number is stored in a array of u_int32_t 461 * it's supported lists of flow-id, so in the o.arg1 we store how many 462 * additional flow-id we want to filter, the basic is 1 463 */ 464void 465fill_flow6( ipfw_insn_u32 *cmd, char *av, int cblen) 466{ 467 u_int32_t type; /* Current flow number */ 468 u_int16_t nflow = 0; /* Current flow index */ 469 char *s = av; 470 cmd->d[0] = 0; /* Initializing the base number*/ 471 472 while (s) { 473 CHECK_LENGTH(cblen, F_INSN_SIZE(ipfw_insn_u32) + nflow + 1); 474 475 av = strsep( &s, ",") ; 476 type = strtoul(av, &av, 0); 477 if (*av != ',' && *av != '\0') 478 errx(EX_DATAERR, "invalid ipv6 flow number %s", av); 479 if (type > 0xfffff) 480 errx(EX_DATAERR, "flow number out of range %s", av); 481 cmd->d[nflow] |= type; 482 nflow++; 483 } 484 if( nflow > 0 ) { 485 cmd->o.opcode = O_FLOW6ID; 486 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32) + nflow; 487 cmd->o.arg1 = nflow; 488 } 489 else { 490 errx(EX_DATAERR, "invalid ipv6 flow number %s", av); 491 } 492} 493 494ipfw_insn * 495add_srcip6(ipfw_insn *cmd, char *av, int cblen) 496{ 497 498 fill_ip6((ipfw_insn_ip6 *)cmd, av, cblen); 499 if (cmd->opcode == O_IP_DST_SET) /* set */ 500 cmd->opcode = O_IP_SRC_SET; 501 else if (cmd->opcode == O_IP_DST_LOOKUP) /* table */ 502 cmd->opcode = O_IP_SRC_LOOKUP; 503 else if (F_LEN(cmd) == 0) { /* any */ 504 } else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn)) { /* "me" */ 505 cmd->opcode = O_IP6_SRC_ME; 506 } else if (F_LEN(cmd) == 507 (F_INSN_SIZE(struct in6_addr) + F_INSN_SIZE(ipfw_insn))) { 508 /* single IP, no mask*/ 509 cmd->opcode = O_IP6_SRC; 510 } else { /* addr/mask opt */ 511 cmd->opcode = O_IP6_SRC_MASK; 512 } 513 return cmd; 514} 515 516ipfw_insn * 517add_dstip6(ipfw_insn *cmd, char *av, int cblen) 518{ 519 520 fill_ip6((ipfw_insn_ip6 *)cmd, av, cblen); 521 if (cmd->opcode == O_IP_DST_SET) /* set */ 522 ; 523 else if (cmd->opcode == O_IP_DST_LOOKUP) /* table */ 524 ; 525 else if (F_LEN(cmd) == 0) { /* any */ 526 } else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn)) { /* "me" */ 527 cmd->opcode = O_IP6_DST_ME; 528 } else if (F_LEN(cmd) == 529 (F_INSN_SIZE(struct in6_addr) + F_INSN_SIZE(ipfw_insn))) { 530 /* single IP, no mask*/ 531 cmd->opcode = O_IP6_DST; 532 } else { /* addr/mask opt */ 533 cmd->opcode = O_IP6_DST_MASK; 534 } 535 return cmd; 536} 537