sys/netgraph/netflow/ng_netflow.c

   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                         if (msg->header.arglen != sizeof(struct ngnf_show_header))
 508                                 ERROUT(EINVAL);
 509
 510                         NG_MKRESPONSE(resp, msg, NGRESP_SIZE, M_NOWAIT);
 511
 512                         if (!resp)
 513                                 ERROUT(ENOMEM);
 514
 515                         error = ng_netflow_flow_show(priv,
 516                             (struct ngnf_show_header *)msg->data,
 517                             (struct ngnf_show_header *)resp->data);
 518
 519                         if (error)
 520                                 NG_FREE_MSG(resp);
 521
 522                         break;
 523                 }
 524                 default:
 525                         ERROUT(EINVAL);         /* unknown command */
 526                         break;
 527                 }
 528                 break;
 529         default:
 530                 ERROUT(EINVAL);         /* incorrect cookie */
 531                 break;
 532         }
 533
 534         /*
 535          * Take care of synchronous response, if any.
 536          * Free memory and return.
 537          */
 538 done:
 539         NG_RESPOND_MSG(error, node, item, resp);
 540         NG_FREE_MSG(msg);
 541
 542         return (error);
 543 }
 544
 545 /* Receive data on hook. */
 546 static int
 547 ng_netflow_rcvdata (hook_p hook, item_p item)
 548 {
 549         const node_p node = NG_HOOK_NODE(hook);
 550         const priv_p priv = NG_NODE_PRIVATE(node);
 551         const iface_p iface = NG_HOOK_PRIVATE(hook);
 552         hook_p out;
 553         struct mbuf *m = NULL, *m_old = NULL;
 554         struct ip *ip = NULL;
 555         struct ip6_hdr *ip6 = NULL;
 556         struct m_tag *mtag;
 557         int pullup_len = 0, off;
 558         uint8_t upper_proto = 0, is_frag = 0;
 559         int error = 0, bypass = 0, acct = 0;
 560         unsigned int src_if_index;
 561         caddr_t upper_ptr = NULL;
 562         fib_export_p fe;
 563         uint32_t fib;
 564
 565         if ((hook == priv->export) || (hook == priv->export9)) {
 566                 /*
 567                  * Data arrived on export hook.
 568                  * This must not happen.
 569                  */
 570                 log(LOG_ERR, "ng_netflow: incoming data on export hook!\n");
 571                 ERROUT(EINVAL);
 572         };
 573
 574         if (hook == iface->hook) {
 575                 if ((iface->info.conf & NG_NETFLOW_CONF_INGRESS) == 0)
 576                         bypass = 1;
 577                 out = iface->out;
 578         } else if (hook == iface->out) {
 579                 if ((iface->info.conf & NG_NETFLOW_CONF_EGRESS) == 0)
 580                         bypass = 1;
 581                 out = iface->hook;
 582         } else
 583                 ERROUT(EINVAL);
 584
 585         if ((!bypass) &&
 586             (iface->info.conf & (NG_NETFLOW_CONF_ONCE | NG_NETFLOW_CONF_THISONCE))) {
 587                 mtag = m_tag_locate(NGI_M(item), MTAG_NETFLOW,
 588                     MTAG_NETFLOW_CALLED, NULL);
 589                 while (mtag != NULL) {
 590                         if ((iface->info.conf & NG_NETFLOW_CONF_ONCE) ||
 591                             ((ng_ID_t *)(mtag + 1))[0] == NG_NODE_ID(node)) {
 592                                 bypass = 1;
 593                                 break;
 594                         }
 595                         mtag = m_tag_locate(NGI_M(item), MTAG_NETFLOW,
 596                             MTAG_NETFLOW_CALLED, mtag);
 597                 }
 598         }
 599
 600         if (bypass) {
 601                 if (out == NULL)
 602                         ERROUT(ENOTCONN);
 603
 604                 NG_FWD_ITEM_HOOK(error, item, out);
 605                 return (error);
 606         }
 607
 608         if (iface->info.conf & (NG_NETFLOW_CONF_ONCE | NG_NETFLOW_CONF_THISONCE)) {
 609                 mtag = m_tag_alloc(MTAG_NETFLOW, MTAG_NETFLOW_CALLED,
 610                     sizeof(ng_ID_t), M_NOWAIT);
 611                 if (mtag) {
 612                         ((ng_ID_t *)(mtag + 1))[0] = NG_NODE_ID(node);
 613                         m_tag_prepend(NGI_M(item), mtag);
 614                 }
 615         }
 616
 617         NGI_GET_M(item, m);
 618         m_old = m;
 619
 620         /* Increase counters. */
 621         iface->info.ifinfo_packets++;
 622
 623         /*
 624          * Depending on interface data link type and packet contents
 625          * we pullup enough data, so that ng_netflow_flow_add() does not
 626          * need to know about mbuf at all. We keep current length of data
 627          * needed to be contiguous in pullup_len. mtod() is done at the
 628          * very end one more time, since m can had changed after pulluping.
 629          *
 630          * In case of unrecognized data we don't return error, but just
 631          * pass data to downstream hook, if it is available.
 632          */
 633
 634 #define M_CHECK(length) do {                                    \
 635         pullup_len += length;                                   \
 636         if (((m)->m_pkthdr.len < (pullup_len)) ||               \
 637            ((pullup_len) > MHLEN)) {                            \
 638                 error = EINVAL;                                 \
 639                 goto bypass;                                    \
 640         }                                                       \
 641         if ((m)->m_len < (pullup_len) &&                        \
 642            (((m) = m_pullup((m),(pullup_len))) == NULL)) {      \
 643                 error = ENOBUFS;                                \
 644                 goto done;                                      \
 645         }                                                       \
 646 } while (0)
 647
 648         switch (iface->info.ifinfo_dlt) {
 649         case DLT_EN10MB:        /* Ethernet */
 650             {
 651                 struct ether_header *eh;
 652                 uint16_t etype;
 653
 654                 M_CHECK(sizeof(struct ether_header));
 655                 eh = mtod(m, struct ether_header *);
 656
 657                 /* Make sure this is IP frame. */
 658                 etype = ntohs(eh->ether_type);
 659                 switch (etype) {
 660                 case ETHERTYPE_IP:
 661                         M_CHECK(sizeof(struct ip));
 662                         eh = mtod(m, struct ether_header *);
 663                         ip = (struct ip *)(eh + 1);
 664                         break;
 665 #ifdef INET6
 666                 case ETHERTYPE_IPV6:
 667                         /*
 668                          * m_pullup() called by M_CHECK() pullups
 669                          * kern.ipc.max_protohdr (default 60 bytes) which is enough
 670                          */
 671                         M_CHECK(sizeof(struct ip6_hdr));
 672                         eh = mtod(m, struct ether_header *);
 673                         ip6 = (struct ip6_hdr *)(eh + 1);
 674                         break;
 675 #endif
 676                 case ETHERTYPE_VLAN:
 677                     {
 678                         struct ether_vlan_header *evh;
 679
 680                         M_CHECK(sizeof(struct ether_vlan_header) -
 681                             sizeof(struct ether_header));
 682                         evh = mtod(m, struct ether_vlan_header *);
 683                         etype = ntohs(evh->evl_proto);
 684
 685                         if (etype == ETHERTYPE_IP) {
 686                                 M_CHECK(sizeof(struct ip));
 687                                 ip = (struct ip *)(evh + 1);
 688                                 break;
 689 #ifdef INET6
 690                         } else if (etype == ETHERTYPE_IPV6) {
 691                                 M_CHECK(sizeof(struct ip6_hdr));
 692                                 ip6 = (struct ip6_hdr *)(evh + 1);
 693                                 break;
 694 #endif
 695                         }
 696                     }
 697                 default:
 698                         goto bypass;    /* pass this frame */
 699                 }
 700                 break;
 701             }
 702         case DLT_RAW:           /* IP packets */
 703                 M_CHECK(sizeof(struct ip));
 704                 ip = mtod(m, struct ip *);
 705 #ifdef INET6
 706                 /* If INET6 is not defined IPv6 packets will be discarded in ng_netflow_flow_add() */
 707                 if (ip->ip_v == IP6VERSION) {
 708                         /* IPv6 packet */
 709                         ip = NULL;
 710                         M_CHECK(sizeof(struct ip6_hdr));
 711                         ip6 = mtod(m, struct ip6_hdr *);
 712                 }
 713 #endif
 714                 break;
 715         default:
 716                 goto bypass;
 717                 break;
 718         }
 719
 720         off = pullup_len;
 721
 722         if ((ip != NULL) && ((ip->ip_off & htons(IP_OFFMASK)) == 0)) {
 723                 if ((ip->ip_v != IPVERSION) ||
 724                     ((ip->ip_hl << 2) < sizeof(struct ip)))
 725                         goto bypass;
 726                 /*
 727                  * In case of IPv4 header with options, we haven't pulled
 728                  * up enough, yet.
 729                  */
 730                 M_CHECK((ip->ip_hl << 2) - sizeof(struct ip));
 731
 732                 /* Save upper layer offset and proto */
 733                 off = pullup_len;
 734                 upper_proto = ip->ip_p;
 735
 736                 /*
 737                  * XXX: in case of wrong upper layer header we will forward this packet
 738                  * but skip this record in netflow
 739                  */
 740                 switch (ip->ip_p) {
 741                 case IPPROTO_TCP:
 742                         M_CHECK(sizeof(struct tcphdr));
 743                         break;
 744                 case IPPROTO_UDP:
 745                         M_CHECK(sizeof(struct udphdr));
 746                         break;
 747                 case IPPROTO_SCTP:
 748                         M_CHECK(sizeof(struct sctphdr));
 749                         break;
 750                 }
 751         } else if (ip != NULL) {
 752                 /* Nothing to save except upper layer proto, since this is packet fragment */
 753                 is_frag = 1;
 754                 upper_proto = ip->ip_p;
 755                 if ((ip->ip_v != IPVERSION) ||
 756                     ((ip->ip_hl << 2) < sizeof(struct ip)))
 757                         goto bypass;
 758 #ifdef INET6
 759         } else if (ip6 != NULL) {
 760                 /* Check if we can export */
 761                 if (priv->export9 == NULL)
 762                         goto bypass;
 763
 764                 /* Loop thru IPv6 extended headers to get upper layer header / frag */
 765                 int cur = ip6->ip6_nxt, hdr_off = 0;
 766                 struct ip6_ext *ip6e;
 767                 struct ip6_frag *ip6f;
 768
 769                 /* Save upper layer info */
 770                 off = pullup_len;
 771                 upper_proto = cur;
 772
 773                 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION)
 774                         goto bypass;
 775
 776                 while (42) {
 777                         switch (cur) {
 778                         /*
 779                          * Same as in IPv4, we can forward 'bad' packet without accounting
 780                          */
 781                         case IPPROTO_TCP:
 782                                 M_CHECK(sizeof(struct tcphdr));
 783                                 goto loopend;
 784                         case IPPROTO_UDP:
 785                                 M_CHECK(sizeof(struct udphdr));
 786                                 goto loopend;
 787                         case IPPROTO_SCTP:
 788                                 M_CHECK(sizeof(struct sctphdr));
 789                                 goto loopend;
 790
 791                         /* Loop until 'real' upper layer headers */
 792                         case IPPROTO_HOPOPTS:
 793                         case IPPROTO_ROUTING:
 794                         case IPPROTO_DSTOPTS:
 795                                 M_CHECK(sizeof(struct ip6_ext));
 796                                 ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + off);
 797                                 upper_proto = ip6e->ip6e_nxt;
 798                                 hdr_off = (ip6e->ip6e_len + 1) << 3;
 799                                 break;
 800
 801                         /* RFC4302, can be before DSTOPTS */
 802                         case IPPROTO_AH:
 803                                 M_CHECK(sizeof(struct ip6_ext));
 804                                 ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + off);
 805                                 upper_proto = ip6e->ip6e_nxt;
 806                                 hdr_off = (ip6e->ip6e_len + 2) << 2;
 807                                 break;
 808
 809                         case IPPROTO_FRAGMENT:
 810                                 M_CHECK(sizeof(struct ip6_frag));
 811                                 ip6f = (struct ip6_frag *)(mtod(m, caddr_t) + off);
 812                                 upper_proto = ip6f->ip6f_nxt;
 813                                 hdr_off = sizeof(struct ip6_frag);
 814                                 off += hdr_off;
 815                                 is_frag = 1;
 816                                 goto loopend;
 817
 818 #if 0
 819                         case IPPROTO_NONE:
 820                                 goto loopend;
 821 #endif
 822                         /* Any unknow header (new extension or IPv6/IPv4 header for tunnels) */
 823                         default:
 824                                 goto loopend;
 825                         }
 826
 827                         off += hdr_off;
 828                         cur = upper_proto;
 829                 }
 830 #endif
 831         }
 832 #undef  M_CHECK
 833
 834 #ifdef INET6
 835 loopend:
 836 #endif
 837         /* Just in case of real reallocation in M_CHECK() / m_pullup() */
 838         if (m != m_old) {
 839                 atomic_fetchadd_32(&priv->info.nfinfo_realloc_mbuf, 1);
 840                 ip = NULL;
 841                 ip6 = NULL;
 842                 switch (iface->info.ifinfo_dlt) {
 843                 case DLT_EN10MB:        /* Ethernet */
 844                     {
 845                         struct ether_header *eh;
 846
 847                         eh = mtod(m, struct ether_header *);
 848                         switch (ntohs(eh->ether_type)) {
 849                         case ETHERTYPE_IP:
 850                                 ip = (struct ip *)(eh + 1);
 851                                 break;
 852 #ifdef INET6
 853                         case ETHERTYPE_IPV6:
 854                                 ip6 = (struct ip6_hdr *)(eh + 1);
 855                                 break;
 856 #endif
 857                         case ETHERTYPE_VLAN:
 858                             {
 859                                 struct ether_vlan_header *evh;
 860
 861                                 evh = mtod(m, struct ether_vlan_header *);
 862                                 if (ntohs(evh->evl_proto) == ETHERTYPE_IP) {
 863                                         ip = (struct ip *)(evh + 1);
 864                                         break;
 865 #ifdef INET6
 866                                 } else if (ntohs(evh->evl_proto) == ETHERTYPE_IPV6) {
 867                                         ip6 = (struct ip6_hdr *)(evh + 1);
 868                                         break;
 869 #endif
 870                                 }
 871                             }
 872                         default:
 873                                 panic("ng_netflow entered deadcode");
 874                         }
 875                         break;
 876                     }
 877                 case DLT_RAW:           /* IP packets */
 878                         ip = mtod(m, struct ip *);
 879 #ifdef INET6
 880                         if (ip->ip_v == IP6VERSION) {
 881                                 /* IPv6 packet */
 882                                 ip = NULL;
 883                                 ip6 = mtod(m, struct ip6_hdr *);
 884                         }
 885 #endif
 886                         break;
 887                 default:
 888                         panic("ng_netflow entered deadcode");
 889                 }
 890         }
 891
 892         upper_ptr = (caddr_t)(mtod(m, caddr_t) + off);
 893
 894         /* Determine packet input interface. Prefer configured. */
 895         src_if_index = 0;
 896         if (hook == iface->out || iface->info.ifinfo_index == 0) {
 897                 if (m->m_pkthdr.rcvif != NULL)
 898                         src_if_index = m->m_pkthdr.rcvif->if_index;
 899         } else
 900                 src_if_index = iface->info.ifinfo_index;
 901
 902         /* Check packet FIB */
 903         fib = M_GETFIB(m);
 904         if (fib >= RT_NUMFIBS) {
 905                 CTR2(KTR_NET, "ng_netflow_rcvdata(): packet fib %d is out of range of available fibs: 0 .. %d", fib, RT_NUMFIBS);
 906                 goto bypass;
 907         }
 908
 909         if ((fe = priv_to_fib(priv, fib)) == NULL) {
 910                 /* Setup new FIB */
 911                 if (ng_netflow_fib_init(priv, fib) != 0) {
 912                         /* malloc() failed */
 913                         goto bypass;
 914                 }
 915
 916                 fe = priv_to_fib(priv, fib);
 917         }
 918
 919         if (ip != NULL)
 920                 error = ng_netflow_flow_add(priv, fe, ip, upper_ptr, upper_proto, is_frag, src_if_index);
 921 #ifdef INET6
 922         else if (ip6 != NULL)
 923                 error = ng_netflow_flow6_add(priv, fe, ip6, upper_ptr, upper_proto, is_frag, src_if_index);
 924 #endif
 925         else
 926                 goto bypass;
 927
 928         acct = 1;
 929 bypass:
 930         if (out != NULL) {
 931                 if (acct == 0) {
 932                         /* Accounting failure */
 933                         if (ip != NULL) {
 934                                 atomic_fetchadd_32(&priv->info.nfinfo_spackets, 1);
 935                                 priv->info.nfinfo_sbytes += m_length(m, NULL);
 936                         } else if (ip6 != NULL) {
 937                                 atomic_fetchadd_32(&priv->info.nfinfo_spackets6, 1);
 938                                 priv->info.nfinfo_sbytes6 += m_length(m, NULL);
 939                         }
 940                 }
 941
 942                 /* XXX: error gets overwritten here */
 943                 NG_FWD_NEW_DATA(error, item, out, m);
 944                 return (error);
 945         }
 946 done:
 947         if (item)
 948                 NG_FREE_ITEM(item);
 949         if (m)
 950                 NG_FREE_M(m);
 951
 952         return (error);
 953 }
 954
 955 /* We will be shut down in a moment */
 956 static int
 957 ng_netflow_close(node_p node)
 958 {
 959         const priv_p priv = NG_NODE_PRIVATE(node);
 960
 961         callout_drain(&priv->exp_callout);
 962         ng_netflow_cache_flush(priv);
 963
 964         return (0);
 965 }
 966
 967 /* Do local shutdown processing. */
 968 static int
 969 ng_netflow_rmnode(node_p node)
 970 {
 971         const priv_p priv = NG_NODE_PRIVATE(node);
 972
 973         NG_NODE_SET_PRIVATE(node, NULL);
 974         NG_NODE_UNREF(priv->node);
 975
 976         free(priv, M_NETGRAPH);
 977
 978         return (0);
 979 }
 980
 981 /* Hook disconnection. */
 982 static int
 983 ng_netflow_disconnect(hook_p hook)
 984 {
 985         node_p node = NG_HOOK_NODE(hook);
 986         priv_p priv = NG_NODE_PRIVATE(node);
 987         iface_p iface = NG_HOOK_PRIVATE(hook);
 988
 989         if (iface != NULL) {
 990                 if (iface->hook == hook)
 991                         iface->hook = NULL;
 992                 if (iface->out == hook)
 993                         iface->out = NULL;
 994         }
 995
 996         /* if export hook disconnected stop running expire(). */
 997         if (hook == priv->export) {
 998                 if (priv->export9 == NULL)
 999                         callout_drain(&priv->exp_callout);
1000                 priv->export = NULL;
1001         }
1002
1003         if (hook == priv->export9) {
1004                 if (priv->export == NULL)
1005                         callout_drain(&priv->exp_callout);
1006                 priv->export9 = NULL;
1007         }
1008
1009         /* Removal of the last link destroys the node. */
1010         if (NG_NODE_NUMHOOKS(node) == 0)
1011                 ng_rmnode_self(node);
1012
1013         return (0);
1014 }