Chia-chi Yeh | 706e567 | 2011-06-02 14:26:57 -0700 | [diff] [blame] | 1 | /*- |
| 2 | * Copyright (c) 2001 Charles Mott <cm@linktel.net> |
| 3 | * Brian Somers <brian@Awfulhak.org> |
| 4 | * All rights reserved. |
| 5 | * |
| 6 | * Redistribution and use in source and binary forms, with or without |
| 7 | * modification, are permitted provided that the following conditions |
| 8 | * are met: |
| 9 | * 1. Redistributions of source code must retain the above copyright |
| 10 | * notice, this list of conditions and the following disclaimer. |
| 11 | * 2. Redistributions in binary form must reproduce the above copyright |
| 12 | * notice, this list of conditions and the following disclaimer in the |
| 13 | * documentation and/or other materials provided with the distribution. |
| 14 | * |
| 15 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
| 16 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 17 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 18 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
| 19 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 20 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 21 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 22 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 23 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 24 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 25 | * SUCH DAMAGE. |
| 26 | * |
| 27 | * $FreeBSD: src/usr.sbin/ppp/nat_cmd.c,v 1.62.10.1.4.1 2010/12/21 17:10:29 kensmith Exp $ |
| 28 | */ |
| 29 | |
| 30 | #include <sys/param.h> |
| 31 | #include <netinet/in.h> |
| 32 | #include <arpa/inet.h> |
| 33 | #include <netdb.h> |
| 34 | #include <netinet/in_systm.h> |
| 35 | #include <netinet/in.h> |
| 36 | #include <netinet/ip.h> |
| 37 | #include <sys/socket.h> |
| 38 | #include <sys/un.h> |
| 39 | |
| 40 | #include <stdarg.h> |
| 41 | #include <stdio.h> |
| 42 | #include <stdlib.h> |
| 43 | #include <string.h> |
| 44 | #include <termios.h> |
| 45 | |
| 46 | #ifdef LOCALNAT |
| 47 | #include "alias.h" |
| 48 | #else |
| 49 | #include <alias.h> |
| 50 | #endif |
| 51 | |
| 52 | #include "layer.h" |
| 53 | #include "proto.h" |
| 54 | #include "defs.h" |
| 55 | #include "command.h" |
| 56 | #include "log.h" |
| 57 | #include "nat_cmd.h" |
| 58 | #include "descriptor.h" |
| 59 | #include "prompt.h" |
| 60 | #include "timer.h" |
| 61 | #include "fsm.h" |
| 62 | #include "slcompress.h" |
| 63 | #include "throughput.h" |
| 64 | #include "iplist.h" |
| 65 | #include "mbuf.h" |
| 66 | #include "lqr.h" |
| 67 | #include "hdlc.h" |
| 68 | #include "ncpaddr.h" |
| 69 | #include "ip.h" |
| 70 | #include "ipcp.h" |
| 71 | #include "ipv6cp.h" |
| 72 | #include "lcp.h" |
| 73 | #include "ccp.h" |
| 74 | #include "link.h" |
| 75 | #include "mp.h" |
| 76 | #include "filter.h" |
| 77 | #ifndef NORADIUS |
| 78 | #include "radius.h" |
| 79 | #endif |
| 80 | #include "ncp.h" |
| 81 | #include "bundle.h" |
| 82 | |
| 83 | |
| 84 | #define NAT_EXTRABUF (13) |
| 85 | |
| 86 | static int StrToAddr(const char *, struct in_addr *); |
| 87 | static int StrToPortRange(const char *, u_short *, u_short *, const char *); |
| 88 | static int StrToAddrAndPort(const char *, struct in_addr *, u_short *, |
| 89 | u_short *, const char *); |
| 90 | |
| 91 | static void |
| 92 | lowhigh(u_short *a, u_short *b) |
| 93 | { |
| 94 | if (a > b) { |
| 95 | u_short c; |
| 96 | |
| 97 | c = *b; |
| 98 | *b = *a; |
| 99 | *a = c; |
| 100 | } |
| 101 | } |
| 102 | |
| 103 | int |
| 104 | nat_RedirectPort(struct cmdargs const *arg) |
| 105 | { |
| 106 | if (!arg->bundle->NatEnabled) { |
| 107 | prompt_Printf(arg->prompt, "Alias not enabled\n"); |
| 108 | return 1; |
| 109 | } else if (arg->argc == arg->argn + 3 || arg->argc == arg->argn + 4) { |
| 110 | char proto_constant; |
| 111 | const char *proto; |
| 112 | struct in_addr localaddr; |
| 113 | u_short hlocalport, llocalport; |
| 114 | struct in_addr aliasaddr; |
| 115 | u_short haliasport, laliasport; |
| 116 | struct in_addr remoteaddr; |
| 117 | u_short hremoteport, lremoteport; |
| 118 | struct alias_link *link; |
| 119 | int error; |
| 120 | |
| 121 | proto = arg->argv[arg->argn]; |
| 122 | if (strcmp(proto, "tcp") == 0) { |
| 123 | proto_constant = IPPROTO_TCP; |
| 124 | } else if (strcmp(proto, "udp") == 0) { |
| 125 | proto_constant = IPPROTO_UDP; |
| 126 | } else { |
| 127 | prompt_Printf(arg->prompt, "port redirect: protocol must be" |
| 128 | " tcp or udp\n"); |
| 129 | return -1; |
| 130 | } |
| 131 | |
| 132 | error = StrToAddrAndPort(arg->argv[arg->argn+1], &localaddr, &llocalport, |
| 133 | &hlocalport, proto); |
| 134 | if (error) { |
| 135 | prompt_Printf(arg->prompt, "nat port: error reading localaddr:port\n"); |
| 136 | return -1; |
| 137 | } |
| 138 | |
| 139 | error = StrToPortRange(arg->argv[arg->argn+2], &laliasport, &haliasport, |
| 140 | proto); |
| 141 | if (error) { |
| 142 | prompt_Printf(arg->prompt, "nat port: error reading alias port\n"); |
| 143 | return -1; |
| 144 | } |
| 145 | aliasaddr.s_addr = INADDR_ANY; |
| 146 | |
| 147 | if (arg->argc == arg->argn + 4) { |
| 148 | error = StrToAddrAndPort(arg->argv[arg->argn+3], &remoteaddr, |
| 149 | &lremoteport, &hremoteport, proto); |
| 150 | if (error) { |
| 151 | prompt_Printf(arg->prompt, "nat port: error reading " |
| 152 | "remoteaddr:port\n"); |
| 153 | return -1; |
| 154 | } |
| 155 | } else { |
| 156 | remoteaddr.s_addr = INADDR_ANY; |
| 157 | lremoteport = hremoteport = 0; |
| 158 | } |
| 159 | |
| 160 | lowhigh(&llocalport, &hlocalport); |
| 161 | lowhigh(&laliasport, &haliasport); |
| 162 | lowhigh(&lremoteport, &hremoteport); |
| 163 | |
| 164 | if (haliasport - laliasport != hlocalport - llocalport) { |
| 165 | prompt_Printf(arg->prompt, "nat port: local & alias port ranges " |
| 166 | "are not equal\n"); |
| 167 | return -1; |
| 168 | } |
| 169 | |
| 170 | if (hremoteport && hremoteport - lremoteport != hlocalport - llocalport) { |
| 171 | prompt_Printf(arg->prompt, "nat port: local & remote port ranges " |
| 172 | "are not equal\n"); |
| 173 | return -1; |
| 174 | } |
| 175 | |
| 176 | do { |
| 177 | link = PacketAliasRedirectPort(localaddr, htons(llocalport), |
| 178 | remoteaddr, htons(lremoteport), |
| 179 | aliasaddr, htons(laliasport), |
| 180 | proto_constant); |
| 181 | |
| 182 | if (link == NULL) { |
| 183 | prompt_Printf(arg->prompt, "nat port: %d: error %d\n", laliasport, |
| 184 | error); |
| 185 | return 1; |
| 186 | } |
| 187 | llocalport++; |
| 188 | if (hremoteport) |
| 189 | lremoteport++; |
| 190 | } while (laliasport++ < haliasport); |
| 191 | |
| 192 | return 0; |
| 193 | } |
| 194 | |
| 195 | return -1; |
| 196 | } |
| 197 | |
| 198 | |
| 199 | int |
| 200 | nat_RedirectAddr(struct cmdargs const *arg) |
| 201 | { |
| 202 | if (!arg->bundle->NatEnabled) { |
| 203 | prompt_Printf(arg->prompt, "nat not enabled\n"); |
| 204 | return 1; |
| 205 | } else if (arg->argc == arg->argn+2) { |
| 206 | int error; |
| 207 | struct in_addr localaddr, aliasaddr; |
| 208 | struct alias_link *link; |
| 209 | |
| 210 | error = StrToAddr(arg->argv[arg->argn], &localaddr); |
| 211 | if (error) { |
| 212 | prompt_Printf(arg->prompt, "address redirect: invalid local address\n"); |
| 213 | return 1; |
| 214 | } |
| 215 | error = StrToAddr(arg->argv[arg->argn+1], &aliasaddr); |
| 216 | if (error) { |
| 217 | prompt_Printf(arg->prompt, "address redirect: invalid alias address\n"); |
| 218 | prompt_Printf(arg->prompt, "usage: nat %s %s\n", arg->cmd->name, |
| 219 | arg->cmd->syntax); |
| 220 | return 1; |
| 221 | } |
| 222 | link = PacketAliasRedirectAddr(localaddr, aliasaddr); |
| 223 | if (link == NULL) { |
| 224 | prompt_Printf(arg->prompt, "address redirect: packet aliasing" |
| 225 | " engine error\n"); |
| 226 | prompt_Printf(arg->prompt, "usage: nat %s %s\n", arg->cmd->name, |
| 227 | arg->cmd->syntax); |
| 228 | } |
| 229 | } else |
| 230 | return -1; |
| 231 | |
| 232 | return 0; |
| 233 | } |
| 234 | |
| 235 | |
| 236 | int |
| 237 | nat_RedirectProto(struct cmdargs const *arg) |
| 238 | { |
| 239 | if (!arg->bundle->NatEnabled) { |
| 240 | prompt_Printf(arg->prompt, "nat not enabled\n"); |
| 241 | return 1; |
| 242 | } else if (arg->argc >= arg->argn + 2 && arg->argc <= arg->argn + 4) { |
| 243 | struct in_addr localIP, publicIP, remoteIP; |
| 244 | struct alias_link *link; |
| 245 | struct protoent *pe; |
| 246 | int error; |
| 247 | unsigned len; |
| 248 | |
| 249 | len = strlen(arg->argv[arg->argn]); |
| 250 | if (len == 0) { |
| 251 | prompt_Printf(arg->prompt, "proto redirect: invalid protocol\n"); |
| 252 | return 1; |
| 253 | } |
| 254 | if (strspn(arg->argv[arg->argn], "01234567") == len) |
| 255 | pe = getprotobynumber(atoi(arg->argv[arg->argn])); |
| 256 | else |
| 257 | pe = getprotobyname(arg->argv[arg->argn]); |
| 258 | if (pe == NULL) { |
| 259 | prompt_Printf(arg->prompt, "proto redirect: invalid protocol\n"); |
| 260 | return 1; |
| 261 | } |
| 262 | |
| 263 | error = StrToAddr(arg->argv[arg->argn + 1], &localIP); |
| 264 | if (error) { |
| 265 | prompt_Printf(arg->prompt, "proto redirect: invalid src address\n"); |
| 266 | return 1; |
| 267 | } |
| 268 | |
| 269 | if (arg->argc >= arg->argn + 3) { |
| 270 | error = StrToAddr(arg->argv[arg->argn + 2], &publicIP); |
| 271 | if (error) { |
| 272 | prompt_Printf(arg->prompt, "proto redirect: invalid alias address\n"); |
| 273 | prompt_Printf(arg->prompt, "usage: nat %s %s\n", arg->cmd->name, |
| 274 | arg->cmd->syntax); |
| 275 | return 1; |
| 276 | } |
| 277 | } else |
| 278 | publicIP.s_addr = INADDR_ANY; |
| 279 | |
| 280 | if (arg->argc == arg->argn + 4) { |
| 281 | error = StrToAddr(arg->argv[arg->argn + 2], &remoteIP); |
| 282 | if (error) { |
| 283 | prompt_Printf(arg->prompt, "proto redirect: invalid dst address\n"); |
| 284 | prompt_Printf(arg->prompt, "usage: nat %s %s\n", arg->cmd->name, |
| 285 | arg->cmd->syntax); |
| 286 | return 1; |
| 287 | } |
| 288 | } else |
| 289 | remoteIP.s_addr = INADDR_ANY; |
| 290 | |
| 291 | link = PacketAliasRedirectProto(localIP, remoteIP, publicIP, pe->p_proto); |
| 292 | if (link == NULL) { |
| 293 | prompt_Printf(arg->prompt, "proto redirect: packet aliasing" |
| 294 | " engine error\n"); |
| 295 | prompt_Printf(arg->prompt, "usage: nat %s %s\n", arg->cmd->name, |
| 296 | arg->cmd->syntax); |
| 297 | } |
| 298 | } else |
| 299 | return -1; |
| 300 | |
| 301 | return 0; |
| 302 | } |
| 303 | |
| 304 | |
| 305 | static int |
| 306 | StrToAddr(const char *str, struct in_addr *addr) |
| 307 | { |
| 308 | struct hostent *hp; |
| 309 | |
| 310 | if (inet_aton(str, addr)) |
| 311 | return 0; |
| 312 | |
| 313 | hp = gethostbyname(str); |
| 314 | if (!hp) { |
| 315 | log_Printf(LogWARN, "StrToAddr: Unknown host %s.\n", str); |
| 316 | return -1; |
| 317 | } |
| 318 | *addr = *((struct in_addr *) hp->h_addr); |
| 319 | return 0; |
| 320 | } |
| 321 | |
| 322 | |
| 323 | static int |
| 324 | StrToPort(const char *str, u_short *port, const char *proto) |
| 325 | { |
| 326 | struct servent *sp; |
| 327 | char *end; |
| 328 | |
| 329 | *port = strtol(str, &end, 10); |
| 330 | if (*end != '\0') { |
| 331 | sp = getservbyname(str, proto); |
| 332 | if (sp == NULL) { |
| 333 | log_Printf(LogWARN, "StrToAddr: Unknown port or service %s/%s.\n", |
| 334 | str, proto); |
| 335 | return -1; |
| 336 | } |
| 337 | *port = ntohs(sp->s_port); |
| 338 | } |
| 339 | |
| 340 | return 0; |
| 341 | } |
| 342 | |
| 343 | static int |
| 344 | StrToPortRange(const char *str, u_short *low, u_short *high, const char *proto) |
| 345 | { |
| 346 | char *minus; |
| 347 | int res; |
| 348 | |
| 349 | minus = strchr(str, '-'); |
| 350 | if (minus) |
| 351 | *minus = '\0'; /* Cheat the const-ness ! */ |
| 352 | |
| 353 | res = StrToPort(str, low, proto); |
| 354 | |
| 355 | if (minus) |
| 356 | *minus = '-'; /* Cheat the const-ness ! */ |
| 357 | |
| 358 | if (res == 0) { |
| 359 | if (minus) |
| 360 | res = StrToPort(minus + 1, high, proto); |
| 361 | else |
| 362 | *high = *low; |
| 363 | } |
| 364 | |
| 365 | return res; |
| 366 | } |
| 367 | |
| 368 | static int |
| 369 | StrToAddrAndPort(const char *str, struct in_addr *addr, u_short *low, |
| 370 | u_short *high, const char *proto) |
| 371 | { |
| 372 | char *colon; |
| 373 | int res; |
| 374 | |
| 375 | colon = strchr(str, ':'); |
| 376 | if (!colon) { |
| 377 | log_Printf(LogWARN, "StrToAddrAndPort: %s is missing port number.\n", str); |
| 378 | return -1; |
| 379 | } |
| 380 | |
| 381 | *colon = '\0'; /* Cheat the const-ness ! */ |
| 382 | res = StrToAddr(str, addr); |
| 383 | *colon = ':'; /* Cheat the const-ness ! */ |
| 384 | if (res != 0) |
| 385 | return -1; |
| 386 | |
| 387 | return StrToPortRange(colon + 1, low, high, proto); |
| 388 | } |
| 389 | |
| 390 | int |
| 391 | nat_ProxyRule(struct cmdargs const *arg) |
| 392 | { |
| 393 | char cmd[LINE_LEN]; |
| 394 | int f, pos; |
| 395 | size_t len; |
| 396 | |
| 397 | if (arg->argn >= arg->argc) |
| 398 | return -1; |
| 399 | |
| 400 | for (f = arg->argn, pos = 0; f < arg->argc; f++) { |
| 401 | len = strlen(arg->argv[f]); |
| 402 | if (sizeof cmd - pos < len + (len ? 1 : 0)) |
| 403 | break; |
| 404 | if (len) |
| 405 | cmd[pos++] = ' '; |
| 406 | strcpy(cmd + pos, arg->argv[f]); |
| 407 | pos += len; |
| 408 | } |
| 409 | |
| 410 | return PacketAliasProxyRule(cmd); |
| 411 | } |
| 412 | |
| 413 | int |
| 414 | nat_SetTarget(struct cmdargs const *arg) |
| 415 | { |
| 416 | struct in_addr addr; |
| 417 | |
| 418 | if (arg->argc == arg->argn) { |
| 419 | addr.s_addr = INADDR_ANY; |
| 420 | PacketAliasSetTarget(addr); |
| 421 | return 0; |
| 422 | } |
| 423 | |
| 424 | if (arg->argc != arg->argn + 1) |
| 425 | return -1; |
| 426 | |
| 427 | if (!strcasecmp(arg->argv[arg->argn], "MYADDR")) { |
| 428 | addr.s_addr = INADDR_ANY; |
| 429 | PacketAliasSetTarget(addr); |
| 430 | return 0; |
| 431 | } |
| 432 | |
| 433 | addr = GetIpAddr(arg->argv[arg->argn]); |
| 434 | if (addr.s_addr == INADDR_NONE) { |
| 435 | log_Printf(LogWARN, "%s: invalid address\n", arg->argv[arg->argn]); |
| 436 | return 1; |
| 437 | } |
| 438 | |
| 439 | PacketAliasSetTarget(addr); |
| 440 | return 0; |
| 441 | } |
| 442 | |
| 443 | #ifndef NO_FW_PUNCH |
| 444 | int |
| 445 | nat_PunchFW(struct cmdargs const *arg) |
| 446 | { |
| 447 | char *end; |
| 448 | long base, count; |
| 449 | |
| 450 | if (arg->argc == arg->argn) { |
| 451 | PacketAliasSetMode(0, PKT_ALIAS_PUNCH_FW); |
| 452 | return 0; |
| 453 | } |
| 454 | |
| 455 | if (arg->argc != arg->argn + 2) |
| 456 | return -1; |
| 457 | |
| 458 | base = strtol(arg->argv[arg->argn], &end, 10); |
| 459 | if (*end != '\0' || base < 0) |
| 460 | return -1; |
| 461 | |
| 462 | count = strtol(arg->argv[arg->argn + 1], &end, 10); |
| 463 | if (*end != '\0' || count < 0) |
| 464 | return -1; |
| 465 | |
| 466 | PacketAliasSetFWBase(base, count); |
| 467 | PacketAliasSetMode(PKT_ALIAS_PUNCH_FW, PKT_ALIAS_PUNCH_FW); |
| 468 | |
| 469 | return 0; |
| 470 | } |
| 471 | #endif |
| 472 | |
| 473 | int |
| 474 | nat_SkinnyPort(struct cmdargs const *arg) |
| 475 | { |
| 476 | char *end; |
| 477 | long port; |
| 478 | |
| 479 | if (arg->argc == arg->argn) { |
| 480 | PacketAliasSetSkinnyPort(0); |
| 481 | return 0; |
| 482 | } |
| 483 | |
| 484 | if (arg->argc != arg->argn + 1) |
| 485 | return -1; |
| 486 | |
| 487 | port = strtol(arg->argv[arg->argn], &end, 10); |
| 488 | if (*end != '\0' || port < 0) |
| 489 | return -1; |
| 490 | |
| 491 | PacketAliasSetSkinnyPort(port); |
| 492 | |
| 493 | return 0; |
| 494 | } |
| 495 | |
| 496 | static struct mbuf * |
| 497 | nat_LayerPush(struct bundle *bundle, struct link *l __unused, struct mbuf *bp, |
| 498 | int pri __unused, u_short *proto) |
| 499 | { |
| 500 | if (!bundle->NatEnabled || *proto != PROTO_IP) |
| 501 | return bp; |
| 502 | |
| 503 | log_Printf(LogDEBUG, "nat_LayerPush: PROTO_IP -> PROTO_IP\n"); |
| 504 | m_settype(bp, MB_NATOUT); |
| 505 | /* Ensure there's a bit of extra buffer for the NAT code... */ |
| 506 | bp = m_pullup(m_append(bp, NULL, NAT_EXTRABUF)); |
| 507 | PacketAliasOut(MBUF_CTOP(bp), bp->m_len); |
| 508 | bp->m_len = ntohs(((struct ip *)MBUF_CTOP(bp))->ip_len); |
| 509 | |
| 510 | return bp; |
| 511 | } |
| 512 | |
| 513 | static struct mbuf * |
| 514 | nat_LayerPull(struct bundle *bundle, struct link *l __unused, struct mbuf *bp, |
| 515 | u_short *proto) |
| 516 | { |
| 517 | static int gfrags; |
| 518 | int ret, len, nfrags; |
| 519 | struct mbuf **last; |
| 520 | char *fptr; |
| 521 | |
| 522 | if (!bundle->NatEnabled || *proto != PROTO_IP) |
| 523 | return bp; |
| 524 | |
| 525 | log_Printf(LogDEBUG, "nat_LayerPull: PROTO_IP -> PROTO_IP\n"); |
| 526 | m_settype(bp, MB_NATIN); |
| 527 | /* Ensure there's a bit of extra buffer for the NAT code... */ |
| 528 | bp = m_pullup(m_append(bp, NULL, NAT_EXTRABUF)); |
| 529 | ret = PacketAliasIn(MBUF_CTOP(bp), bp->m_len); |
| 530 | |
| 531 | bp->m_len = ntohs(((struct ip *)MBUF_CTOP(bp))->ip_len); |
| 532 | if (bp->m_len > MAX_MRU) { |
| 533 | log_Printf(LogWARN, "nat_LayerPull: Problem with IP header length (%lu)\n", |
| 534 | (unsigned long)bp->m_len); |
| 535 | m_freem(bp); |
| 536 | return NULL; |
| 537 | } |
| 538 | |
| 539 | switch (ret) { |
| 540 | case PKT_ALIAS_OK: |
| 541 | break; |
| 542 | |
| 543 | case PKT_ALIAS_UNRESOLVED_FRAGMENT: |
| 544 | /* Save the data for later */ |
| 545 | if ((fptr = malloc(bp->m_len)) == NULL) { |
| 546 | log_Printf(LogWARN, "nat_LayerPull: Dropped unresolved fragment -" |
| 547 | " out of memory!\n"); |
| 548 | m_freem(bp); |
| 549 | bp = NULL; |
| 550 | } else { |
| 551 | bp = mbuf_Read(bp, fptr, bp->m_len); |
| 552 | PacketAliasSaveFragment(fptr); |
| 553 | log_Printf(LogDEBUG, "Store another frag (%lu) - now %d\n", |
| 554 | (unsigned long)((struct ip *)fptr)->ip_id, ++gfrags); |
| 555 | } |
| 556 | break; |
| 557 | |
| 558 | case PKT_ALIAS_FOUND_HEADER_FRAGMENT: |
| 559 | /* Fetch all the saved fragments and chain them on the end of `bp' */ |
| 560 | last = &bp->m_nextpkt; |
| 561 | nfrags = 0; |
| 562 | while ((fptr = PacketAliasGetFragment(MBUF_CTOP(bp))) != NULL) { |
| 563 | nfrags++; |
| 564 | PacketAliasFragmentIn(MBUF_CTOP(bp), fptr); |
| 565 | len = ntohs(((struct ip *)fptr)->ip_len); |
| 566 | *last = m_get(len, MB_NATIN); |
| 567 | memcpy(MBUF_CTOP(*last), fptr, len); |
| 568 | free(fptr); |
| 569 | last = &(*last)->m_nextpkt; |
| 570 | } |
| 571 | gfrags -= nfrags; |
| 572 | log_Printf(LogDEBUG, "Found a frag header (%lu) - plus %d more frags (no" |
| 573 | "w %d)\n", (unsigned long)((struct ip *)MBUF_CTOP(bp))->ip_id, |
| 574 | nfrags, gfrags); |
| 575 | break; |
| 576 | |
| 577 | case PKT_ALIAS_IGNORED: |
| 578 | if (PacketAliasSetMode(0, 0) & PKT_ALIAS_DENY_INCOMING) { |
| 579 | log_Printf(LogTCPIP, "NAT engine denied data:\n"); |
| 580 | m_freem(bp); |
| 581 | bp = NULL; |
| 582 | } else if (log_IsKept(LogTCPIP)) { |
| 583 | log_Printf(LogTCPIP, "NAT engine ignored data:\n"); |
| 584 | PacketCheck(bundle, AF_INET, MBUF_CTOP(bp), bp->m_len, NULL, |
| 585 | NULL, NULL); |
| 586 | } |
| 587 | break; |
| 588 | |
| 589 | default: |
| 590 | log_Printf(LogWARN, "nat_LayerPull: Dropped a packet (%d)....\n", ret); |
| 591 | m_freem(bp); |
| 592 | bp = NULL; |
| 593 | break; |
| 594 | } |
| 595 | |
| 596 | return bp; |
| 597 | } |
| 598 | |
| 599 | struct layer natlayer = |
| 600 | { LAYER_NAT, "nat", nat_LayerPush, nat_LayerPull }; |