1 /*- 2 * Copyright (c) 2010-2011 Alexander V. Chernikov <melifaro@ipfw.ru> 3 * Copyright (c) 2004-2005 Gleb Smirnoff <glebius@FreeBSD.org> 4 * Copyright (c) 2001-2003 Roman V. Palagin <romanp@unshadow.net> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 * 28 * $SourceForge: ng_netflow.c,v 1.30 2004/09/05 11:37:43 glebius Exp $ 29 */ 30 31 static const char rcs_id[] = 32 "@(#) $FreeBSD$"; 33 34 #include "opt_inet6.h" 35 #include "opt_route.h" 36 37 #include <sys/param.h> 38 #include <sys/systm.h> 39 #include <sys/kernel.h> 40 #include <sys/limits.h> 41 #include <sys/mbuf.h> 42 #include <sys/socket.h> 43 #include <sys/syslog.h> 44 #include <sys/ctype.h> 45 46 #include <net/if.h> 47 #include <net/ethernet.h> 48 #include <net/route.h> 49 #include <net/if_arp.h> 50 #include <net/if_var.h> 51 #include <net/if_vlan_var.h> 52 #include <net/bpf.h> 53 #include <netinet/in.h> 54 #include <netinet/in_systm.h> 55 #include <netinet/ip.h> 56 #include <netinet/ip6.h> 57 #include <netinet/tcp.h> 58 #include <netinet/udp.h> 59 #include <netinet/sctp.h> 60 61 #include <netgraph/ng_message.h> 62 #include <netgraph/ng_parse.h> 63 #include <netgraph/netgraph.h> 64 #include <netgraph/netflow/netflow.h> 65 #include <netgraph/netflow/netflow_v9.h> 66 #include <netgraph/netflow/ng_netflow.h> 67 68 /* Netgraph methods */ 69 static ng_constructor_t ng_netflow_constructor; 70 static ng_rcvmsg_t ng_netflow_rcvmsg; 71 static ng_close_t ng_netflow_close; 72 static ng_shutdown_t ng_netflow_rmnode; 73 static ng_newhook_t ng_netflow_newhook; 74 static ng_rcvdata_t ng_netflow_rcvdata; 75 static ng_disconnect_t ng_netflow_disconnect; 76 77 /* Parse type for struct ng_netflow_info */ 78 static const struct ng_parse_struct_field ng_netflow_info_type_fields[] 79 = NG_NETFLOW_INFO_TYPE; 80 static const struct ng_parse_type ng_netflow_info_type = { 81 &ng_parse_struct_type, 82 &ng_netflow_info_type_fields 83 }; 84 85 /* Parse type for struct ng_netflow_ifinfo */ 86 static const struct ng_parse_struct_field ng_netflow_ifinfo_type_fields[] 87 = NG_NETFLOW_IFINFO_TYPE; 88 static const struct ng_parse_type ng_netflow_ifinfo_type = { 89 &ng_parse_struct_type, 90 &ng_netflow_ifinfo_type_fields 91 }; 92 93 /* Parse type for struct ng_netflow_setdlt */ 94 static const struct ng_parse_struct_field ng_netflow_setdlt_type_fields[] 95 = NG_NETFLOW_SETDLT_TYPE; 96 static const struct ng_parse_type ng_netflow_setdlt_type = { 97 &ng_parse_struct_type, 98 &ng_netflow_setdlt_type_fields 99 }; 100 101 /* Parse type for ng_netflow_setifindex */ 102 static const struct ng_parse_struct_field ng_netflow_setifindex_type_fields[] 103 = NG_NETFLOW_SETIFINDEX_TYPE; 104 static const struct ng_parse_type ng_netflow_setifindex_type = { 105 &ng_parse_struct_type, 106 &ng_netflow_setifindex_type_fields 107 }; 108 109 /* Parse type for ng_netflow_settimeouts */ 110 static const struct ng_parse_struct_field ng_netflow_settimeouts_type_fields[] 111 = NG_NETFLOW_SETTIMEOUTS_TYPE; 112 static const struct ng_parse_type ng_netflow_settimeouts_type = { 113 &ng_parse_struct_type, 114 &ng_netflow_settimeouts_type_fields 115 }; 116 117 /* Parse type for ng_netflow_setconfig */ 118 static const struct ng_parse_struct_field ng_netflow_setconfig_type_fields[] 119 = NG_NETFLOW_SETCONFIG_TYPE; 120 static const struct ng_parse_type ng_netflow_setconfig_type = { 121 &ng_parse_struct_type, 122 &ng_netflow_setconfig_type_fields 123 }; 124 125 /* Parse type for ng_netflow_settemplate */ 126 static const struct ng_parse_struct_field ng_netflow_settemplate_type_fields[] 127 = NG_NETFLOW_SETTEMPLATE_TYPE; 128 static const struct ng_parse_type ng_netflow_settemplate_type = { 129 &ng_parse_struct_type, 130 &ng_netflow_settemplate_type_fields 131 }; 132 133 /* Parse type for ng_netflow_setmtu */ 134 static const struct ng_parse_struct_field ng_netflow_setmtu_type_fields[] 135 = NG_NETFLOW_SETMTU_TYPE; 136 static const struct ng_parse_type ng_netflow_setmtu_type = { 137 &ng_parse_struct_type, 138 &ng_netflow_setmtu_type_fields 139 }; 140 141 /* List of commands and how to convert arguments to/from ASCII */ 142 static const struct ng_cmdlist ng_netflow_cmds[] = { 143 { 144 NGM_NETFLOW_COOKIE, 145 NGM_NETFLOW_INFO, 146 "info", 147 NULL, 148 &ng_netflow_info_type 149 }, 150 { 151 NGM_NETFLOW_COOKIE, 152 NGM_NETFLOW_IFINFO, 153 "ifinfo", 154 &ng_parse_uint16_type, 155 &ng_netflow_ifinfo_type 156 }, 157 { 158 NGM_NETFLOW_COOKIE, 159 NGM_NETFLOW_SETDLT, 160 "setdlt", 161 &ng_netflow_setdlt_type, 162 NULL 163 }, 164 { 165 NGM_NETFLOW_COOKIE, 166 NGM_NETFLOW_SETIFINDEX, 167 "setifindex", 168 &ng_netflow_setifindex_type, 169 NULL 170 }, 171 { 172 NGM_NETFLOW_COOKIE, 173 NGM_NETFLOW_SETTIMEOUTS, 174 "settimeouts", 175 &ng_netflow_settimeouts_type, 176 NULL 177 }, 178 { 179 NGM_NETFLOW_COOKIE, 180 NGM_NETFLOW_SETCONFIG, 181 "setconfig", 182 &ng_netflow_setconfig_type, 183 NULL 184 }, 185 { 186 NGM_NETFLOW_COOKIE, 187 NGM_NETFLOW_SETTEMPLATE, 188 "settemplate", 189 &ng_netflow_settemplate_type, 190 NULL 191 }, 192 { 193 NGM_NETFLOW_COOKIE, 194 NGM_NETFLOW_SETMTU, 195 "setmtu", 196 &ng_netflow_setmtu_type, 197 NULL 198 }, 199 { 0 } 200 }; 201 202 203 /* Netgraph node type descriptor */ 204 static struct ng_type ng_netflow_typestruct = { 205 .version = NG_ABI_VERSION, 206 .name = NG_NETFLOW_NODE_TYPE, 207 .constructor = ng_netflow_constructor, 208 .rcvmsg = ng_netflow_rcvmsg, 209 .close = ng_netflow_close, 210 .shutdown = ng_netflow_rmnode, 211 .newhook = ng_netflow_newhook, 212 .rcvdata = ng_netflow_rcvdata, 213 .disconnect = ng_netflow_disconnect, 214 .cmdlist = ng_netflow_cmds, 215 }; 216 NETGRAPH_INIT(netflow, &ng_netflow_typestruct); 217 218 /* Called at node creation */ 219 static int 220 ng_netflow_constructor(node_p node) 221 { 222 priv_p priv; 223 int i; 224 225 /* Initialize private data */ 226 priv = malloc(sizeof(*priv), M_NETGRAPH, M_WAITOK | M_ZERO); 227 228 /* Make node and its data point at each other */ 229 NG_NODE_SET_PRIVATE(node, priv); 230 priv->node = node; 231 232 /* Initialize timeouts to default values */ 233 priv->info.nfinfo_inact_t = INACTIVE_TIMEOUT; 234 priv->info.nfinfo_act_t = ACTIVE_TIMEOUT; 235 236 /* Set default config */ 237 for (i = 0; i < NG_NETFLOW_MAXIFACES; i++) 238 priv->ifaces[i].info.conf = NG_NETFLOW_CONF_INGRESS; 239 240 /* Initialize callout handle */ 241 callout_init(&priv->exp_callout, CALLOUT_MPSAFE); 242 243 /* Allocate memory and set up flow cache */ 244 ng_netflow_cache_init(priv); 245 246 return (0); 247 } 248 249 /* 250 * ng_netflow supports two hooks: data and export. 251 * Incoming traffic is expected on data, and expired 252 * netflow datagrams are sent to export. 253 */ 254 static int 255 ng_netflow_newhook(node_p node, hook_p hook, const char *name) 256 { 257 const priv_p priv = NG_NODE_PRIVATE(node); 258 259 if (strncmp(name, NG_NETFLOW_HOOK_DATA, /* an iface hook? */ 260 strlen(NG_NETFLOW_HOOK_DATA)) == 0) { 261 iface_p iface; 262 int ifnum = -1; 263 const char *cp; 264 char *eptr; 265 266 cp = name + strlen(NG_NETFLOW_HOOK_DATA); 267 if (!isdigit(*cp) || (cp[0] == '0' && cp[1] != '\0')) 268 return (EINVAL); 269 270 ifnum = (int)strtoul(cp, &eptr, 10); 271 if (*eptr != '\0' || ifnum < 0 || ifnum >= NG_NETFLOW_MAXIFACES) 272 return (EINVAL); 273 274 /* See if hook is already connected */ 275 if (priv->ifaces[ifnum].hook != NULL) 276 return (EISCONN); 277 278 iface = &priv->ifaces[ifnum]; 279 280 /* Link private info and hook together */ 281 NG_HOOK_SET_PRIVATE(hook, iface); 282 iface->hook = hook; 283 284 /* 285 * In most cases traffic accounting is done on an 286 * Ethernet interface, so default data link type 287 * will be DLT_EN10MB. 288 */ 289 iface->info.ifinfo_dlt = DLT_EN10MB; 290 291 } else if (strncmp(name, NG_NETFLOW_HOOK_OUT, 292 strlen(NG_NETFLOW_HOOK_OUT)) == 0) { 293 iface_p iface; 294 int ifnum = -1; 295 const char *cp; 296 char *eptr; 297 298 cp = name + strlen(NG_NETFLOW_HOOK_OUT); 299 if (!isdigit(*cp) || (cp[0] == '0' && cp[1] != '\0')) 300 return (EINVAL); 301 302 ifnum = (int)strtoul(cp, &eptr, 10); 303 if (*eptr != '\0' || ifnum < 0 || ifnum >= NG_NETFLOW_MAXIFACES) 304 return (EINVAL); 305 306 /* See if hook is already connected */ 307 if (priv->ifaces[ifnum].out != NULL) 308 return (EISCONN); 309 310 iface = &priv->ifaces[ifnum]; 311 312 /* Link private info and hook together */ 313 NG_HOOK_SET_PRIVATE(hook, iface); 314 iface->out = hook; 315 316 } else if (strcmp(name, NG_NETFLOW_HOOK_EXPORT) == 0) { 317 318 if (priv->export != NULL) 319 return (EISCONN); 320 321 /* Netflow version 5 supports 32-bit counters only */ 322 if (CNTR_MAX == UINT64_MAX) 323 return (EINVAL); 324 325 priv->export = hook; 326 327 /* Exporter is ready. Let's schedule expiry. */ 328 callout_reset(&priv->exp_callout, (1*hz), &ng_netflow_expire, 329 (void *)priv); 330 } else if (strcmp(name, NG_NETFLOW_HOOK_EXPORT9) == 0) { 331 332 if (priv->export9 != NULL) 333 return (EISCONN); 334 335 priv->export9 = hook; 336 337 /* Exporter is ready. Let's schedule expiry. */ 338 callout_reset(&priv->exp_callout, (1*hz), &ng_netflow_expire, 339 (void *)priv); 340 } else 341 return (EINVAL); 342 343 return (0); 344 } 345 346 /* Get a netgraph control message. */ 347 static int 348 ng_netflow_rcvmsg (node_p node, item_p item, hook_p lasthook) 349 { 350 const priv_p priv = NG_NODE_PRIVATE(node); 351 struct ng_mesg *resp = NULL; 352 int error = 0; 353 struct ng_mesg *msg; 354 355 NGI_GET_MSG(item, msg); 356 357 /* Deal with message according to cookie and command */ 358 switch (msg->header.typecookie) { 359 case NGM_NETFLOW_COOKIE: 360 switch (msg->header.cmd) { 361 case NGM_NETFLOW_INFO: 362 { 363 struct ng_netflow_info *i; 364 365 NG_MKRESPONSE(resp, msg, sizeof(struct ng_netflow_info), 366 M_NOWAIT); 367 i = (struct ng_netflow_info *)resp->data; 368 ng_netflow_copyinfo(priv, i); 369 370 break; 371 } 372 case NGM_NETFLOW_IFINFO: 373 { 374 struct ng_netflow_ifinfo *i; 375 const uint16_t *index; 376 377 if (msg->header.arglen != sizeof(uint16_t)) 378 ERROUT(EINVAL); 379 380 index = (uint16_t *)msg->data; 381 if (*index >= NG_NETFLOW_MAXIFACES) 382 ERROUT(EINVAL); 383 384 /* connected iface? */ 385 if (priv->ifaces[*index].hook == NULL) 386 ERROUT(EINVAL); 387 388 NG_MKRESPONSE(resp, msg, 389 sizeof(struct ng_netflow_ifinfo), M_NOWAIT); 390 i = (struct ng_netflow_ifinfo *)resp->data; 391 memcpy((void *)i, (void *)&priv->ifaces[*index].info, 392 sizeof(priv->ifaces[*index].info)); 393 394 break; 395 } 396 case NGM_NETFLOW_SETDLT: 397 { 398 struct ng_netflow_setdlt *set; 399 struct ng_netflow_iface *iface; 400 401 if (msg->header.arglen != sizeof(struct ng_netflow_setdlt)) 402 ERROUT(EINVAL); 403 404 set = (struct ng_netflow_setdlt *)msg->data; 405 if (set->iface >= NG_NETFLOW_MAXIFACES) 406 ERROUT(EINVAL); 407 iface = &priv->ifaces[set->iface]; 408 409 /* connected iface? */ 410 if (iface->hook == NULL) 411 ERROUT(EINVAL); 412 413 switch (set->dlt) { 414 case DLT_EN10MB: 415 iface->info.ifinfo_dlt = DLT_EN10MB; 416 break; 417 case DLT_RAW: 418 iface->info.ifinfo_dlt = DLT_RAW; 419 break; 420 default: 421 ERROUT(EINVAL); 422 } 423 break; 424 } 425 case NGM_NETFLOW_SETIFINDEX: 426 { 427 struct ng_netflow_setifindex *set; 428 struct ng_netflow_iface *iface; 429 430 if (msg->header.arglen != sizeof(struct ng_netflow_setifindex)) 431 ERROUT(EINVAL); 432 433 set = (struct ng_netflow_setifindex *)msg->data; 434 if (set->iface >= NG_NETFLOW_MAXIFACES) 435 ERROUT(EINVAL); 436 iface = &priv->ifaces[set->iface]; 437 438 /* connected iface? */ 439 if (iface->hook == NULL) 440 ERROUT(EINVAL); 441 442 iface->info.ifinfo_index = set->index; 443 444 break; 445 } 446 case NGM_NETFLOW_SETTIMEOUTS: 447 { 448 struct ng_netflow_settimeouts *set; 449 450 if (msg->header.arglen != sizeof(struct ng_netflow_settimeouts)) 451 ERROUT(EINVAL); 452 453 set = (struct ng_netflow_settimeouts *)msg->data; 454 455 priv->info.nfinfo_inact_t = set->inactive_timeout; 456 priv->info.nfinfo_act_t = set->active_timeout; 457 458 break; 459 } 460 case NGM_NETFLOW_SETCONFIG: 461 { 462 struct ng_netflow_setconfig *set; 463 464 if (msg->header.arglen != sizeof(struct ng_netflow_setconfig)) 465 ERROUT(EINVAL); 466 467 set = (struct ng_netflow_setconfig *)msg->data; 468 469 if (set->iface >= NG_NETFLOW_MAXIFACES) 470 ERROUT(EINVAL); 471 472 priv->ifaces[set->iface].info.conf = set->conf; 473 474 break; 475 } 476 case NGM_NETFLOW_SETTEMPLATE: 477 { 478 struct ng_netflow_settemplate *set; 479 480 if (msg->header.arglen != sizeof(struct ng_netflow_settemplate)) 481 ERROUT(EINVAL); 482 483 set = (struct ng_netflow_settemplate *)msg->data; 484 485 priv->templ_packets = set->packets; 486 priv->templ_time = set->time; 487 488 break; 489 } 490 case NGM_NETFLOW_SETMTU: 491 { 492 struct ng_netflow_setmtu *set; 493 494 if (msg->header.arglen != sizeof(struct ng_netflow_setmtu)) 495 ERROUT(EINVAL); 496 497 set = (struct ng_netflow_setmtu *)msg->data; 498 if ((set->mtu < MIN_MTU) || (set->mtu > MAX_MTU)) 499 ERROUT(EINVAL); 500 501 priv->mtu = set->mtu; 502 503 break; 504 } 505 case NGM_NETFLOW_SHOW: 506 { 507 uint32_t *last; 508 509 if (msg->header.arglen != sizeof(uint32_t)) 510 ERROUT(EINVAL); 511 512 last = (uint32_t *)msg->data; 513 514 NG_MKRESPONSE(resp, msg, NGRESP_SIZE, M_NOWAIT); 515 516 if (!resp) 517 ERROUT(ENOMEM); 518 519 error = ng_netflow_flow_show(priv, *last, resp); 520 521 break; 522 } 523 default: 524 ERROUT(EINVAL); /* unknown command */ 525 break; 526 } 527 break; 528 default: 529 ERROUT(EINVAL); /* incorrect cookie */ 530 break; 531 } 532 533 /* 534 * Take care of synchronous response, if any. 535 * Free memory and return. 536 */ 537 done: 538 NG_RESPOND_MSG(error, node, item, resp); 539 NG_FREE_MSG(msg); 540 541 return (error); 542 } 543 544 /* Receive data on hook. */ 545 static int 546 ng_netflow_rcvdata (hook_p hook, item_p item) 547 { 548 const node_p node = NG_HOOK_NODE(hook); 549 const priv_p priv = NG_NODE_PRIVATE(node); 550 const iface_p iface = NG_HOOK_PRIVATE(hook); 551 hook_p out; 552 struct mbuf *m = NULL, *m_old = NULL; 553 struct ip *ip = NULL; 554 struct ip6_hdr *ip6 = NULL; 555 struct m_tag *mtag; 556 int pullup_len = 0, off; 557 uint8_t upper_proto = 0, is_frag = 0; 558 int error = 0, bypass = 0, acct = 0; 559 unsigned int src_if_index; 560 caddr_t upper_ptr = NULL; 561 fib_export_p fe; 562 uint32_t fib; 563 564 if ((hook == priv->export) || (hook == priv->export9)) { 565 /* 566 * Data arrived on export hook. 567 * This must not happen. 568 */ 569 log(LOG_ERR, "ng_netflow: incoming data on export hook!\n"); 570 ERROUT(EINVAL); 571 }; 572 573 if (hook == iface->hook) { 574 if ((iface->info.conf & NG_NETFLOW_CONF_INGRESS) == 0) 575 bypass = 1; 576 out = iface->out; 577 } else if (hook == iface->out) { 578 if ((iface->info.conf & NG_NETFLOW_CONF_EGRESS) == 0) 579 bypass = 1; 580 out = iface->hook; 581 } else 582 ERROUT(EINVAL); 583 584 if ((!bypass) && 585 (iface->info.conf & (NG_NETFLOW_CONF_ONCE | NG_NETFLOW_CONF_THISONCE))) { 586 mtag = m_tag_locate(NGI_M(item), MTAG_NETFLOW, 587 MTAG_NETFLOW_CALLED, NULL); 588 while (mtag != NULL) { 589 if ((iface->info.conf & NG_NETFLOW_CONF_ONCE) || 590 ((ng_ID_t *)(mtag + 1))[0] == NG_NODE_ID(node)) { 591 bypass = 1; 592 break; 593 } 594 mtag = m_tag_locate(NGI_M(item), MTAG_NETFLOW, 595 MTAG_NETFLOW_CALLED, mtag); 596 } 597 } 598 599 if (bypass) { 600 if (out == NULL) 601 ERROUT(ENOTCONN); 602 603 NG_FWD_ITEM_HOOK(error, item, out); 604 return (error); 605 } 606 607 if (iface->info.conf & (NG_NETFLOW_CONF_ONCE | NG_NETFLOW_CONF_THISONCE)) { 608 mtag = m_tag_alloc(MTAG_NETFLOW, MTAG_NETFLOW_CALLED, 609 sizeof(ng_ID_t), M_NOWAIT); 610 if (mtag) { 611 ((ng_ID_t *)(mtag + 1))[0] = NG_NODE_ID(node); 612 m_tag_prepend(NGI_M(item), mtag); 613 } 614 } 615 616 NGI_GET_M(item, m); 617 m_old = m; 618 619 /* Increase counters. */ 620 iface->info.ifinfo_packets++; 621 622 /* 623 * Depending on interface data link type and packet contents 624 * we pullup enough data, so that ng_netflow_flow_add() does not 625 * need to know about mbuf at all. We keep current length of data 626 * needed to be contiguous in pullup_len. mtod() is done at the 627 * very end one more time, since m can had changed after pulluping. 628 * 629 * In case of unrecognized data we don't return error, but just 630 * pass data to downstream hook, if it is available. 631 */ 632 633 #define M_CHECK(length) do { \ 634 pullup_len += length; \ 635 if (((m)->m_pkthdr.len < (pullup_len)) || \ 636 ((pullup_len) > MHLEN)) { \ 637 error = EINVAL; \ 638 goto bypass; \ 639 } \ 640 if ((m)->m_len < (pullup_len) && \ 641 (((m) = m_pullup((m),(pullup_len))) == NULL)) { \ 642 error = ENOBUFS; \ 643 goto done; \ 644 } \ 645 } while (0) 646 647 switch (iface->info.ifinfo_dlt) { 648 case DLT_EN10MB: /* Ethernet */ 649 { 650 struct ether_header *eh; 651 uint16_t etype; 652 653 M_CHECK(sizeof(struct ether_header)); 654 eh = mtod(m, struct ether_header *); 655 656 /* Make sure this is IP frame. */ 657 etype = ntohs(eh->ether_type); 658 switch (etype) { 659 case ETHERTYPE_IP: 660 M_CHECK(sizeof(struct ip)); 661 eh = mtod(m, struct ether_header *); 662 ip = (struct ip *)(eh + 1); 663 break; 664 #ifdef INET6 665 case ETHERTYPE_IPV6: 666 /* 667 * m_pullup() called by M_CHECK() pullups 668 * kern.ipc.max_protohdr (default 60 bytes) which is enough 669 */ 670 M_CHECK(sizeof(struct ip6_hdr)); 671 eh = mtod(m, struct ether_header *); 672 ip6 = (struct ip6_hdr *)(eh + 1); 673 break; 674 #endif 675 case ETHERTYPE_VLAN: 676 { 677 struct ether_vlan_header *evh; 678 679 M_CHECK(sizeof(struct ether_vlan_header) - 680 sizeof(struct ether_header)); 681 evh = mtod(m, struct ether_vlan_header *); 682 etype = ntohs(evh->evl_proto); 683 684 if (etype == ETHERTYPE_IP) { 685 M_CHECK(sizeof(struct ip)); 686 ip = (struct ip *)(evh + 1); 687 break; 688 #ifdef INET6 689 } else if (etype == ETHERTYPE_IPV6) { 690 M_CHECK(sizeof(struct ip6_hdr)); 691 ip6 = (struct ip6_hdr *)(evh + 1); 692 break; 693 #endif 694 } 695 } 696 default: 697 goto bypass; /* pass this frame */ 698 } 699 break; 700 } 701 case DLT_RAW: /* IP packets */ 702 M_CHECK(sizeof(struct ip)); 703 ip = mtod(m, struct ip *); 704 #ifdef INET6 705 /* If INET6 is not defined IPv6 packets will be discarded in ng_netflow_flow_add() */ 706 if (ip->ip_v == IP6VERSION) { 707 /* IPv6 packet */ 708 ip = NULL; 709 M_CHECK(sizeof(struct ip6_hdr)); 710 ip6 = mtod(m, struct ip6_hdr *); 711 } 712 #endif 713 break; 714 default: 715 goto bypass; 716 break; 717 } 718 719 off = pullup_len; 720 721 if ((ip != NULL) && ((ip->ip_off & htons(IP_OFFMASK)) == 0)) { 722 if ((ip->ip_v != IPVERSION) || 723 ((ip->ip_hl << 2) < sizeof(struct ip))) 724 goto bypass; 725 /* 726 * In case of IPv4 header with options, we haven't pulled 727 * up enough, yet. 728 */ 729 M_CHECK((ip->ip_hl << 2) - sizeof(struct ip)); 730 731 /* Save upper layer offset and proto */ 732 off = pullup_len; 733 upper_proto = ip->ip_p; 734 735 /* 736 * XXX: in case of wrong upper layer header we will forward this packet 737 * but skip this record in netflow 738 */ 739 switch (ip->ip_p) { 740 case IPPROTO_TCP: 741 M_CHECK(sizeof(struct tcphdr)); 742 break; 743 case IPPROTO_UDP: 744 M_CHECK(sizeof(struct udphdr)); 745 break; 746 case IPPROTO_SCTP: 747 M_CHECK(sizeof(struct sctphdr)); 748 break; 749 } 750 } else if (ip != NULL) { 751 /* Nothing to save except upper layer proto, since this is packet fragment */ 752 is_frag = 1; 753 upper_proto = ip->ip_p; 754 if ((ip->ip_v != IPVERSION) || 755 ((ip->ip_hl << 2) < sizeof(struct ip))) 756 goto bypass; 757 #ifdef INET6 758 } else if (ip6 != NULL) { 759 /* Check if we can export */ 760 if (priv->export9 == NULL) 761 goto bypass; 762 763 /* Loop thru IPv6 extended headers to get upper layer header / frag */ 764 int cur = ip6->ip6_nxt, hdr_off = 0; 765 struct ip6_ext *ip6e; 766 struct ip6_frag *ip6f; 767 768 /* Save upper layer info */ 769 off = pullup_len; 770 upper_proto = cur; 771 772 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) 773 goto bypass; 774 775 while (42) { 776 switch (cur) { 777 /* 778 * Same as in IPv4, we can forward 'bad' packet without accounting 779 */ 780 case IPPROTO_TCP: 781 M_CHECK(sizeof(struct tcphdr)); 782 goto loopend; 783 case IPPROTO_UDP: 784 M_CHECK(sizeof(struct udphdr)); 785 goto loopend; 786 case IPPROTO_SCTP: 787 M_CHECK(sizeof(struct sctphdr)); 788 goto loopend; 789 790 /* Loop until 'real' upper layer headers */ 791 case IPPROTO_HOPOPTS: 792 case IPPROTO_ROUTING: 793 case IPPROTO_DSTOPTS: 794 M_CHECK(sizeof(struct ip6_ext)); 795 ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + off); 796 upper_proto = ip6e->ip6e_nxt; 797 hdr_off = (ip6e->ip6e_len + 1) << 3; 798 break; 799 800 /* RFC4302, can be before DSTOPTS */ 801 case IPPROTO_AH: 802 M_CHECK(sizeof(struct ip6_ext)); 803 ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + off); 804 upper_proto = ip6e->ip6e_nxt; 805 hdr_off = (ip6e->ip6e_len + 2) << 2; 806 break; 807 808 case IPPROTO_FRAGMENT: 809 M_CHECK(sizeof(struct ip6_frag)); 810 ip6f = (struct ip6_frag *)(mtod(m, caddr_t) + off); 811 upper_proto = ip6f->ip6f_nxt; 812 hdr_off = sizeof(struct ip6_frag); 813 off += hdr_off; 814 is_frag = 1; 815 goto loopend; 816 817 #if 0 818 case IPPROTO_NONE: 819 goto loopend; 820 #endif 821 /* Any unknow header (new extension or IPv6/IPv4 header for tunnels) */ 822 default: 823 goto loopend; 824 } 825 826 off += hdr_off; 827 cur = upper_proto; 828 } 829 #endif 830 } 831 #undef M_CHECK 832 833 #ifdef INET6 834 loopend: 835 #endif 836 /* Just in case of real reallocation in M_CHECK() / m_pullup() */ 837 if (m != m_old) { 838 atomic_fetchadd_32(&priv->info.nfinfo_realloc_mbuf, 1); 839 ip = NULL; 840 ip6 = NULL; 841 switch (iface->info.ifinfo_dlt) { 842 case DLT_EN10MB: /* Ethernet */ 843 { 844 struct ether_header *eh; 845 846 eh = mtod(m, struct ether_header *); 847 switch (ntohs(eh->ether_type)) { 848 case ETHERTYPE_IP: 849 ip = (struct ip *)(eh + 1); 850 break; 851 #ifdef INET6 852 case ETHERTYPE_IPV6: 853 ip6 = (struct ip6_hdr *)(eh + 1); 854 break; 855 #endif 856 case ETHERTYPE_VLAN: 857 { 858 struct ether_vlan_header *evh; 859 860 evh = mtod(m, struct ether_vlan_header *); 861 if (ntohs(evh->evl_proto) == ETHERTYPE_IP) { 862 ip = (struct ip *)(evh + 1); 863 break; 864 #ifdef INET6 865 } else if (ntohs(evh->evl_proto) == ETHERTYPE_IPV6) { 866 ip6 = (struct ip6_hdr *)(evh + 1); 867 break; 868 #endif 869 } 870 } 871 default: 872 panic("ng_netflow entered deadcode"); 873 } 874 break; 875 } 876 case DLT_RAW: /* IP packets */ 877 ip = mtod(m, struct ip *); 878 #ifdef INET6 879 if (ip->ip_v == IP6VERSION) { 880 /* IPv6 packet */ 881 ip = NULL; 882 ip6 = mtod(m, struct ip6_hdr *); 883 } 884 #endif 885 break; 886 default: 887 panic("ng_netflow entered deadcode"); 888 } 889 } 890 891 upper_ptr = (caddr_t)(mtod(m, caddr_t) + off); 892 893 /* Determine packet input interface. Prefer configured. */ 894 src_if_index = 0; 895 if (hook == iface->out || iface->info.ifinfo_index == 0) { 896 if (m->m_pkthdr.rcvif != NULL) 897 src_if_index = m->m_pkthdr.rcvif->if_index; 898 } else 899 src_if_index = iface->info.ifinfo_index; 900 901 /* Check packet FIB */ 902 fib = M_GETFIB(m); 903 if (fib >= RT_NUMFIBS) { 904 CTR2(KTR_NET, "ng_netflow_rcvdata(): packet fib %d is out of range of available fibs: 0 .. %d", fib, RT_NUMFIBS); 905 goto bypass; 906 } 907 908 if ((fe = priv_to_fib(priv, fib)) == NULL) { 909 /* Setup new FIB */ 910 if (ng_netflow_fib_init(priv, fib) != 0) { 911 /* malloc() failed */ 912 goto bypass; 913 } 914 915 fe = priv_to_fib(priv, fib); 916 } 917 918 if (ip != NULL) 919 error = ng_netflow_flow_add(priv, fe, ip, upper_ptr, upper_proto, is_frag, src_if_index); 920 #ifdef INET6 921 else if (ip6 != NULL) 922 error = ng_netflow_flow6_add(priv, fe, ip6, upper_ptr, upper_proto, is_frag, src_if_index); 923 #endif 924 else 925 goto bypass; 926 927 acct = 1; 928 bypass: 929 if (out != NULL) { 930 if (acct == 0) { 931 /* Accounting failure */ 932 if (ip != NULL) { 933 atomic_fetchadd_32(&priv->info.nfinfo_spackets, 1); 934 priv->info.nfinfo_sbytes += m_length(m, NULL); 935 } else if (ip6 != NULL) { 936 atomic_fetchadd_32(&priv->info.nfinfo_spackets6, 1); 937 priv->info.nfinfo_sbytes6 += m_length(m, NULL); 938 } 939 } 940 941 /* XXX: error gets overwritten here */ 942 NG_FWD_NEW_DATA(error, item, out, m); 943 return (error); 944 } 945 done: 946 if (item) 947 NG_FREE_ITEM(item); 948 if (m) 949 NG_FREE_M(m); 950 951 return (error); 952 } 953 954 /* We will be shut down in a moment */ 955 static int 956 ng_netflow_close(node_p node) 957 { 958 const priv_p priv = NG_NODE_PRIVATE(node); 959 960 callout_drain(&priv->exp_callout); 961 ng_netflow_cache_flush(priv); 962 963 return (0); 964 } 965 966 /* Do local shutdown processing. */ 967 static int 968 ng_netflow_rmnode(node_p node) 969 { 970 const priv_p priv = NG_NODE_PRIVATE(node); 971 972 NG_NODE_SET_PRIVATE(node, NULL); 973 NG_NODE_UNREF(priv->node); 974 975 free(priv, M_NETGRAPH); 976 977 return (0); 978 } 979 980 /* Hook disconnection. */ 981 static int 982 ng_netflow_disconnect(hook_p hook) 983 { 984 node_p node = NG_HOOK_NODE(hook); 985 priv_p priv = NG_NODE_PRIVATE(node); 986 iface_p iface = NG_HOOK_PRIVATE(hook); 987 988 if (iface != NULL) { 989 if (iface->hook == hook) 990 iface->hook = NULL; 991 if (iface->out == hook) 992 iface->out = NULL; 993 } 994 995 /* if export hook disconnected stop running expire(). */ 996 if (hook == priv->export) { 997 if (priv->export9 == NULL) 998 callout_drain(&priv->exp_callout); 999 priv->export = NULL; 1000 } 1001 1002 if (hook == priv->export9) { 1003 if (priv->export == NULL) 1004 callout_drain(&priv->exp_callout); 1005 priv->export9 = NULL; 1006 } 1007 1008 /* Removal of the last link destroys the node. */ 1009 if (NG_NODE_NUMHOOKS(node) == 0) 1010 ng_rmnode_self(node); 1011 1012 return (0); 1013 } 1014