sys/netgraph/netflow/ng_netflow.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
   3  *
   4  * Copyright (c) 2010-2011 Alexander V. Chernikov <melifaro@ipfw.ru>
   5  * Copyright (c) 2004-2005 Gleb Smirnoff <glebius@FreeBSD.org>
   6  * Copyright (c) 2001-2003 Roman V. Palagin <romanp@unshadow.net>
   7  * All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  19  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  21  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  22  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  24  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  28  * SUCH DAMAGE.
  29  *
  30  * $SourceForge: ng_netflow.c,v 1.30 2004/09/05 11:37:43 glebius Exp $
  31  */
  32
  33 #include <sys/cdefs.h>
  34 __FBSDID("$FreeBSD$");
  35
  36 #include "opt_inet6.h"
  37 #include "opt_route.h"
  38
  39 #include <sys/param.h>
  40 #include <sys/systm.h>
  41 #include <sys/counter.h>
  42 #include <sys/kernel.h>
  43 #include <sys/ktr.h>
  44 #include <sys/limits.h>
  45 #include <sys/malloc.h>
  46 #include <sys/mbuf.h>
  47 #include <sys/socket.h>
  48 #include <sys/syslog.h>
  49 #include <sys/ctype.h>
  50 #include <vm/uma.h>
  51
  52 #include <net/if.h>
  53 #include <net/ethernet.h>
  54 #include <net/route.h>
  55 #include <net/if_arp.h>
  56 #include <net/if_var.h>
  57 #include <net/if_vlan_var.h>
  58 #include <net/bpf.h>
  59 #include <netinet/in.h>
  60 #include <netinet/in_systm.h>
  61 #include <netinet/ip.h>
  62 #include <netinet/ip6.h>
  63 #include <netinet/tcp.h>
  64 #include <netinet/udp.h>
  65 #include <netinet/sctp.h>
  66
  67 #include <netgraph/ng_message.h>
  68 #include <netgraph/ng_parse.h>
  69 #include <netgraph/netgraph.h>
  70 #include <netgraph/netflow/netflow.h>
  71 #include <netgraph/netflow/netflow_v9.h>
  72 #include <netgraph/netflow/ng_netflow.h>
  73
  74 /* Netgraph methods */
  75 static ng_constructor_t ng_netflow_constructor;
  76 static ng_rcvmsg_t      ng_netflow_rcvmsg;
  77 static ng_close_t       ng_netflow_close;
  78 static ng_shutdown_t    ng_netflow_rmnode;
  79 static ng_newhook_t     ng_netflow_newhook;
  80 static ng_rcvdata_t     ng_netflow_rcvdata;
  81 static ng_disconnect_t  ng_netflow_disconnect;
  82
  83 /* Parse type for struct ng_netflow_info */
  84 static const struct ng_parse_struct_field ng_netflow_info_type_fields[]
  85         = NG_NETFLOW_INFO_TYPE;
  86 static const struct ng_parse_type ng_netflow_info_type = {
  87         &ng_parse_struct_type,
  88         &ng_netflow_info_type_fields
  89 };
  90
  91 /*  Parse type for struct ng_netflow_ifinfo */
  92 static const struct ng_parse_struct_field ng_netflow_ifinfo_type_fields[]
  93         = NG_NETFLOW_IFINFO_TYPE;
  94 static const struct ng_parse_type ng_netflow_ifinfo_type = {
  95         &ng_parse_struct_type,
  96         &ng_netflow_ifinfo_type_fields
  97 };
  98
  99 /* Parse type for struct ng_netflow_setdlt */
 100 static const struct ng_parse_struct_field ng_netflow_setdlt_type_fields[]
 101         = NG_NETFLOW_SETDLT_TYPE;
 102 static const struct ng_parse_type ng_netflow_setdlt_type = {
 103         &ng_parse_struct_type,
 104         &ng_netflow_setdlt_type_fields
 105 };
 106
 107 /* Parse type for ng_netflow_setifindex */
 108 static const struct ng_parse_struct_field ng_netflow_setifindex_type_fields[]
 109         = NG_NETFLOW_SETIFINDEX_TYPE;
 110 static const struct ng_parse_type ng_netflow_setifindex_type = {
 111         &ng_parse_struct_type,
 112         &ng_netflow_setifindex_type_fields
 113 };
 114
 115 /* Parse type for ng_netflow_settimeouts */
 116 static const struct ng_parse_struct_field ng_netflow_settimeouts_type_fields[]
 117         = NG_NETFLOW_SETTIMEOUTS_TYPE;
 118 static const struct ng_parse_type ng_netflow_settimeouts_type = {
 119         &ng_parse_struct_type,
 120         &ng_netflow_settimeouts_type_fields
 121 };
 122
 123 /* Parse type for ng_netflow_setconfig */
 124 static const struct ng_parse_struct_field ng_netflow_setconfig_type_fields[]
 125         = NG_NETFLOW_SETCONFIG_TYPE;
 126 static const struct ng_parse_type ng_netflow_setconfig_type = {
 127         &ng_parse_struct_type,
 128         &ng_netflow_setconfig_type_fields
 129 };
 130
 131 /* Parse type for ng_netflow_settemplate */
 132 static const struct ng_parse_struct_field ng_netflow_settemplate_type_fields[]
 133         = NG_NETFLOW_SETTEMPLATE_TYPE;
 134 static const struct ng_parse_type ng_netflow_settemplate_type = {
 135         &ng_parse_struct_type,
 136         &ng_netflow_settemplate_type_fields
 137 };
 138
 139 /* Parse type for ng_netflow_setmtu */
 140 static const struct ng_parse_struct_field ng_netflow_setmtu_type_fields[]
 141         = NG_NETFLOW_SETMTU_TYPE;
 142 static const struct ng_parse_type ng_netflow_setmtu_type = {
 143         &ng_parse_struct_type,
 144         &ng_netflow_setmtu_type_fields
 145 };
 146
 147 /* Parse type for struct ng_netflow_v9info */
 148 static const struct ng_parse_struct_field ng_netflow_v9info_type_fields[]
 149         = NG_NETFLOW_V9INFO_TYPE;
 150 static const struct ng_parse_type ng_netflow_v9info_type = {
 151         &ng_parse_struct_type,
 152         &ng_netflow_v9info_type_fields
 153 };
 154
 155 /* List of commands and how to convert arguments to/from ASCII */
 156 static const struct ng_cmdlist ng_netflow_cmds[] = {
 157        {
 158          NGM_NETFLOW_COOKIE,
 159          NGM_NETFLOW_INFO,
 160          "info",
 161          NULL,
 162          &ng_netflow_info_type
 163        },
 164        {
 165         NGM_NETFLOW_COOKIE,
 166         NGM_NETFLOW_IFINFO,
 167         "ifinfo",
 168         &ng_parse_uint16_type,
 169         &ng_netflow_ifinfo_type
 170        },
 171        {
 172         NGM_NETFLOW_COOKIE,
 173         NGM_NETFLOW_SETDLT,
 174         "setdlt",
 175         &ng_netflow_setdlt_type,
 176         NULL
 177        },
 178        {
 179         NGM_NETFLOW_COOKIE,
 180         NGM_NETFLOW_SETIFINDEX,
 181         "setifindex",
 182         &ng_netflow_setifindex_type,
 183         NULL
 184        },
 185        {
 186         NGM_NETFLOW_COOKIE,
 187         NGM_NETFLOW_SETTIMEOUTS,
 188         "settimeouts",
 189         &ng_netflow_settimeouts_type,
 190         NULL
 191        },
 192        {
 193         NGM_NETFLOW_COOKIE,
 194         NGM_NETFLOW_SETCONFIG,
 195         "setconfig",
 196         &ng_netflow_setconfig_type,
 197         NULL
 198        },
 199        {
 200         NGM_NETFLOW_COOKIE,
 201         NGM_NETFLOW_SETTEMPLATE,
 202         "settemplate",
 203         &ng_netflow_settemplate_type,
 204         NULL
 205        },
 206        {
 207         NGM_NETFLOW_COOKIE,
 208         NGM_NETFLOW_SETMTU,
 209         "setmtu",
 210         &ng_netflow_setmtu_type,
 211         NULL
 212        },
 213        {
 214          NGM_NETFLOW_COOKIE,
 215          NGM_NETFLOW_V9INFO,
 216          "v9info",
 217          NULL,
 218          &ng_netflow_v9info_type
 219        },
 220        { 0 }
 221 };
 222
 223 /* Netgraph node type descriptor */
 224 static struct ng_type ng_netflow_typestruct = {
 225         .version =      NG_ABI_VERSION,
 226         .name =         NG_NETFLOW_NODE_TYPE,
 227         .constructor =  ng_netflow_constructor,
 228         .rcvmsg =       ng_netflow_rcvmsg,
 229         .close =        ng_netflow_close,
 230         .shutdown =     ng_netflow_rmnode,
 231         .newhook =      ng_netflow_newhook,
 232         .rcvdata =      ng_netflow_rcvdata,
 233         .disconnect =   ng_netflow_disconnect,
 234         .cmdlist =      ng_netflow_cmds,
 235 };
 236 NETGRAPH_INIT(netflow, &ng_netflow_typestruct);
 237
 238 /* Called at node creation */
 239 static int
 240 ng_netflow_constructor(node_p node)
 241 {
 242         priv_p priv;
 243         int i;
 244
 245         /* Initialize private data */
 246         priv = malloc(sizeof(*priv), M_NETGRAPH, M_WAITOK | M_ZERO);
 247
 248         /* Initialize fib data */
 249         priv->maxfibs = rt_numfibs;
 250         priv->fib_data = malloc(sizeof(fib_export_p) * priv->maxfibs,
 251             M_NETGRAPH, M_WAITOK | M_ZERO);
 252
 253         /* Make node and its data point at each other */
 254         NG_NODE_SET_PRIVATE(node, priv);
 255         priv->node = node;
 256
 257         /* Initialize timeouts to default values */
 258         priv->nfinfo_inact_t = INACTIVE_TIMEOUT;
 259         priv->nfinfo_act_t = ACTIVE_TIMEOUT;
 260
 261         /* Set default config */
 262         for (i = 0; i < NG_NETFLOW_MAXIFACES; i++)
 263                 priv->ifaces[i].info.conf = NG_NETFLOW_CONF_INGRESS;
 264
 265         /* Initialize callout handle */
 266         callout_init(&priv->exp_callout, 1);
 267
 268         /* Allocate memory and set up flow cache */
 269         ng_netflow_cache_init(priv);
 270
 271         return (0);
 272 }
 273
 274 /*
 275  * ng_netflow supports two hooks: data and export.
 276  * Incoming traffic is expected on data, and expired
 277  * netflow datagrams are sent to export.
 278  */
 279 static int
 280 ng_netflow_newhook(node_p node, hook_p hook, const char *name)
 281 {
 282         const priv_p priv = NG_NODE_PRIVATE(node);
 283
 284         if (strncmp(name, NG_NETFLOW_HOOK_DATA, /* an iface hook? */
 285             strlen(NG_NETFLOW_HOOK_DATA)) == 0) {
 286                 iface_p iface;
 287                 int ifnum = -1;
 288                 const char *cp;
 289                 char *eptr;
 290
 291                 cp = name + strlen(NG_NETFLOW_HOOK_DATA);
 292                 if (!isdigit(*cp) || (cp[0] == '0' && cp[1] != '\0'))
 293                         return (EINVAL);
 294
 295                 ifnum = (int)strtoul(cp, &eptr, 10);
 296                 if (*eptr != '\0' || ifnum < 0 || ifnum >= NG_NETFLOW_MAXIFACES)
 297                         return (EINVAL);
 298
 299                 /* See if hook is already connected */
 300                 if (priv->ifaces[ifnum].hook != NULL)
 301                         return (EISCONN);
 302
 303                 iface = &priv->ifaces[ifnum];
 304
 305                 /* Link private info and hook together */
 306                 NG_HOOK_SET_PRIVATE(hook, iface);
 307                 iface->hook = hook;
 308
 309                 /*
 310                  * In most cases traffic accounting is done on an
 311                  * Ethernet interface, so default data link type
 312                  * will be DLT_EN10MB.
 313                  */
 314                 iface->info.ifinfo_dlt = DLT_EN10MB;
 315
 316         } else if (strncmp(name, NG_NETFLOW_HOOK_OUT,
 317             strlen(NG_NETFLOW_HOOK_OUT)) == 0) {
 318                 iface_p iface;
 319                 int ifnum = -1;
 320                 const char *cp;
 321                 char *eptr;
 322
 323                 cp = name + strlen(NG_NETFLOW_HOOK_OUT);
 324                 if (!isdigit(*cp) || (cp[0] == '0' && cp[1] != '\0'))
 325                         return (EINVAL);
 326
 327                 ifnum = (int)strtoul(cp, &eptr, 10);
 328                 if (*eptr != '\0' || ifnum < 0 || ifnum >= NG_NETFLOW_MAXIFACES)
 329                         return (EINVAL);
 330
 331                 /* See if hook is already connected */
 332                 if (priv->ifaces[ifnum].out != NULL)
 333                         return (EISCONN);
 334
 335                 iface = &priv->ifaces[ifnum];
 336
 337                 /* Link private info and hook together */
 338                 NG_HOOK_SET_PRIVATE(hook, iface);
 339                 iface->out = hook;
 340
 341         } else if (strcmp(name, NG_NETFLOW_HOOK_EXPORT) == 0) {
 342                 if (priv->export != NULL)
 343                         return (EISCONN);
 344
 345                 /* Netflow version 5 supports 32-bit counters only */
 346                 if (CNTR_MAX == UINT64_MAX)
 347                         return (EINVAL);
 348
 349                 priv->export = hook;
 350
 351                 /* Exporter is ready. Let's schedule expiry. */
 352                 callout_reset(&priv->exp_callout, (1*hz), &ng_netflow_expire,
 353                     (void *)priv);
 354         } else if (strcmp(name, NG_NETFLOW_HOOK_EXPORT9) == 0) {
 355                 if (priv->export9 != NULL)
 356                         return (EISCONN);
 357
 358                 priv->export9 = hook;
 359
 360                 /* Exporter is ready. Let's schedule expiry. */
 361                 callout_reset(&priv->exp_callout, (1*hz), &ng_netflow_expire,
 362                     (void *)priv);
 363         } else
 364                 return (EINVAL);
 365
 366         return (0);
 367 }
 368
 369 /* Get a netgraph control message. */
 370 static int
 371 ng_netflow_rcvmsg (node_p node, item_p item, hook_p lasthook)
 372 {
 373         const priv_p priv = NG_NODE_PRIVATE(node);
 374         struct ng_mesg *resp = NULL;
 375         int error = 0;
 376         struct ng_mesg *msg;
 377
 378         NGI_GET_MSG(item, msg);
 379
 380         /* Deal with message according to cookie and command */
 381         switch (msg->header.typecookie) {
 382         case NGM_NETFLOW_COOKIE:
 383                 switch (msg->header.cmd) {
 384                 case NGM_NETFLOW_INFO:
 385                     {
 386                         struct ng_netflow_info *i;
 387
 388                         NG_MKRESPONSE(resp, msg, sizeof(struct ng_netflow_info),
 389                             M_NOWAIT);
 390                         i = (struct ng_netflow_info *)resp->data;
 391                         ng_netflow_copyinfo(priv, i);
 392
 393                         break;
 394                     }
 395                 case NGM_NETFLOW_IFINFO:
 396                     {
 397                         struct ng_netflow_ifinfo *i;
 398                         const uint16_t *index;
 399
 400                         if (msg->header.arglen != sizeof(uint16_t))
 401                                  ERROUT(EINVAL);
 402
 403                         index  = (uint16_t *)msg->data;
 404                         if (*index >= NG_NETFLOW_MAXIFACES)
 405                                 ERROUT(EINVAL);
 406
 407                         /* connected iface? */
 408                         if (priv->ifaces[*index].hook == NULL)
 409                                  ERROUT(EINVAL);
 410
 411                         NG_MKRESPONSE(resp, msg,
 412                              sizeof(struct ng_netflow_ifinfo), M_NOWAIT);
 413                         i = (struct ng_netflow_ifinfo *)resp->data;
 414                         memcpy((void *)i, (void *)&priv->ifaces[*index].info,
 415                             sizeof(priv->ifaces[*index].info));
 416
 417                         break;
 418                     }
 419                 case NGM_NETFLOW_SETDLT:
 420                     {
 421                         struct ng_netflow_setdlt *set;
 422                         struct ng_netflow_iface *iface;
 423
 424                         if (msg->header.arglen !=
 425                             sizeof(struct ng_netflow_setdlt))
 426                                 ERROUT(EINVAL);
 427
 428                         set = (struct ng_netflow_setdlt *)msg->data;
 429                         if (set->iface >= NG_NETFLOW_MAXIFACES)
 430                                 ERROUT(EINVAL);
 431                         iface = &priv->ifaces[set->iface];
 432
 433                         /* connected iface? */
 434                         if (iface->hook == NULL)
 435                                 ERROUT(EINVAL);
 436
 437                         switch (set->dlt) {
 438                         case    DLT_EN10MB:
 439                                 iface->info.ifinfo_dlt = DLT_EN10MB;
 440                                 break;
 441                         case    DLT_RAW:
 442                                 iface->info.ifinfo_dlt = DLT_RAW;
 443                                 break;
 444                         default:
 445                                 ERROUT(EINVAL);
 446                         }
 447                         break;
 448                     }
 449                 case NGM_NETFLOW_SETIFINDEX:
 450                     {
 451                         struct ng_netflow_setifindex *set;
 452                         struct ng_netflow_iface *iface;
 453
 454                         if (msg->header.arglen !=
 455                             sizeof(struct ng_netflow_setifindex))
 456                                 ERROUT(EINVAL);
 457
 458                         set = (struct ng_netflow_setifindex *)msg->data;
 459                         if (set->iface >= NG_NETFLOW_MAXIFACES)
 460                                 ERROUT(EINVAL);
 461                         iface = &priv->ifaces[set->iface];
 462
 463                         /* connected iface? */
 464                         if (iface->hook == NULL)
 465                                 ERROUT(EINVAL);
 466
 467                         iface->info.ifinfo_index = set->index;
 468
 469                         break;
 470                     }
 471                 case NGM_NETFLOW_SETTIMEOUTS:
 472                     {
 473                         struct ng_netflow_settimeouts *set;
 474
 475                         if (msg->header.arglen !=
 476                             sizeof(struct ng_netflow_settimeouts))
 477                                 ERROUT(EINVAL);
 478
 479                         set = (struct ng_netflow_settimeouts *)msg->data;
 480
 481                         priv->nfinfo_inact_t = set->inactive_timeout;
 482                         priv->nfinfo_act_t = set->active_timeout;
 483
 484                         break;
 485                     }
 486                 case NGM_NETFLOW_SETCONFIG:
 487                     {
 488                         struct ng_netflow_setconfig *set;
 489
 490                         if (msg->header.arglen !=
 491                             sizeof(struct ng_netflow_setconfig))
 492                                 ERROUT(EINVAL);
 493
 494                         set = (struct ng_netflow_setconfig *)msg->data;
 495
 496                         if (set->iface >= NG_NETFLOW_MAXIFACES)
 497                                 ERROUT(EINVAL);
 498
 499                         priv->ifaces[set->iface].info.conf = set->conf;
 500
 501                         break;
 502                     }
 503                 case NGM_NETFLOW_SETTEMPLATE:
 504                     {
 505                         struct ng_netflow_settemplate *set;
 506
 507                         if (msg->header.arglen !=
 508                             sizeof(struct ng_netflow_settemplate))
 509                                 ERROUT(EINVAL);
 510
 511                         set = (struct ng_netflow_settemplate *)msg->data;
 512
 513                         priv->templ_packets = set->packets;
 514                         priv->templ_time = set->time;
 515
 516                         break;
 517                     }
 518                 case NGM_NETFLOW_SETMTU:
 519                     {
 520                         struct ng_netflow_setmtu *set;
 521
 522                         if (msg->header.arglen !=
 523                             sizeof(struct ng_netflow_setmtu))
 524                                 ERROUT(EINVAL);
 525
 526                         set = (struct ng_netflow_setmtu *)msg->data;
 527                         if ((set->mtu < MIN_MTU) || (set->mtu > MAX_MTU))
 528                                 ERROUT(EINVAL);
 529
 530                         priv->mtu = set->mtu;
 531
 532                         break;
 533                     }
 534                 case NGM_NETFLOW_SHOW:
 535                         if (msg->header.arglen !=
 536                             sizeof(struct ngnf_show_header))
 537                                 ERROUT(EINVAL);
 538
 539                         NG_MKRESPONSE(resp, msg, NGRESP_SIZE, M_NOWAIT);
 540
 541                         if (!resp)
 542                                 ERROUT(ENOMEM);
 543
 544                         error = ng_netflow_flow_show(priv,
 545                             (struct ngnf_show_header *)msg->data,
 546                             (struct ngnf_show_header *)resp->data);
 547
 548                         if (error)
 549                                 NG_FREE_MSG(resp);
 550
 551                         break;
 552                 case NGM_NETFLOW_V9INFO:
 553                     {
 554                         struct ng_netflow_v9info *i;
 555
 556                         NG_MKRESPONSE(resp, msg,
 557                             sizeof(struct ng_netflow_v9info), M_NOWAIT);
 558                         i = (struct ng_netflow_v9info *)resp->data;
 559                         ng_netflow_copyv9info(priv, i);
 560
 561                         break;
 562                     }
 563                 default:
 564                         ERROUT(EINVAL);         /* unknown command */
 565                         break;
 566                 }
 567                 break;
 568         default:
 569                 ERROUT(EINVAL);         /* incorrect cookie */
 570                 break;
 571         }
 572
 573         /*
 574          * Take care of synchronous response, if any.
 575          * Free memory and return.
 576          */
 577 done:
 578         NG_RESPOND_MSG(error, node, item, resp);
 579         NG_FREE_MSG(msg);
 580
 581         return (error);
 582 }
 583
 584 /* Receive data on hook. */
 585 static int
 586 ng_netflow_rcvdata (hook_p hook, item_p item)
 587 {
 588         const node_p node = NG_HOOK_NODE(hook);
 589         const priv_p priv = NG_NODE_PRIVATE(node);
 590         const iface_p iface = NG_HOOK_PRIVATE(hook);
 591         hook_p out;
 592         struct mbuf *m = NULL, *m_old = NULL;
 593         struct ip *ip = NULL;
 594         struct ip6_hdr *ip6 = NULL;
 595         struct m_tag *mtag;
 596         int pullup_len = 0, off;
 597         uint8_t acct = 0, bypass = 0, flags = 0, upper_proto = 0;
 598         int error = 0, l3_off = 0;
 599         unsigned int src_if_index;
 600         caddr_t upper_ptr = NULL;
 601         fib_export_p fe;
 602         uint32_t fib;
 603
 604         if ((hook == priv->export) || (hook == priv->export9)) {
 605                 /*
 606                  * Data arrived on export hook.
 607                  * This must not happen.
 608                  */
 609                 log(LOG_ERR, "ng_netflow: incoming data on export hook!\n");
 610                 ERROUT(EINVAL);
 611         }
 612
 613         if (hook == iface->hook) {
 614                 if ((iface->info.conf & NG_NETFLOW_CONF_INGRESS) == 0)
 615                         bypass = 1;
 616                 out = iface->out;
 617         } else if (hook == iface->out) {
 618                 if ((iface->info.conf & NG_NETFLOW_CONF_EGRESS) == 0)
 619                         bypass = 1;
 620                 out = iface->hook;
 621         } else
 622                 ERROUT(EINVAL);
 623
 624         if ((!bypass) && (iface->info.conf &
 625             (NG_NETFLOW_CONF_ONCE | NG_NETFLOW_CONF_THISONCE))) {
 626                 mtag = m_tag_locate(NGI_M(item), MTAG_NETFLOW,
 627                     MTAG_NETFLOW_CALLED, NULL);
 628                 while (mtag != NULL) {
 629                         if ((iface->info.conf & NG_NETFLOW_CONF_ONCE) ||
 630                             ((ng_ID_t *)(mtag + 1))[0] == NG_NODE_ID(node)) {
 631                                 bypass = 1;
 632                                 break;
 633                         }
 634                         mtag = m_tag_locate(NGI_M(item), MTAG_NETFLOW,
 635                             MTAG_NETFLOW_CALLED, mtag);
 636                 }
 637         }
 638
 639         if (bypass) {
 640                 if (out == NULL)
 641                         ERROUT(ENOTCONN);
 642
 643                 NG_FWD_ITEM_HOOK(error, item, out);
 644                 return (error);
 645         }
 646
 647         if (iface->info.conf &
 648             (NG_NETFLOW_CONF_ONCE | NG_NETFLOW_CONF_THISONCE)) {
 649                 mtag = m_tag_alloc(MTAG_NETFLOW, MTAG_NETFLOW_CALLED,
 650                     sizeof(ng_ID_t), M_NOWAIT);
 651                 if (mtag) {
 652                         ((ng_ID_t *)(mtag + 1))[0] = NG_NODE_ID(node);
 653                         m_tag_prepend(NGI_M(item), mtag);
 654                 }
 655         }
 656
 657         /* Import configuration flags related to flow creation */
 658         flags = iface->info.conf & NG_NETFLOW_FLOW_FLAGS;
 659
 660         NGI_GET_M(item, m);
 661         m_old = m;
 662
 663         /* Increase counters. */
 664         iface->info.ifinfo_packets++;
 665
 666         /*
 667          * Depending on interface data link type and packet contents
 668          * we pullup enough data, so that ng_netflow_flow_add() does not
 669          * need to know about mbuf at all. We keep current length of data
 670          * needed to be contiguous in pullup_len. mtod() is done at the
 671          * very end one more time, since m can had changed after pulluping.
 672          *
 673          * In case of unrecognized data we don't return error, but just
 674          * pass data to downstream hook, if it is available.
 675          */
 676
 677 #define M_CHECK(length) do {                                    \
 678         pullup_len += length;                                   \
 679         if (((m)->m_pkthdr.len < (pullup_len)) ||               \
 680            ((pullup_len) > MHLEN)) {                            \
 681                 error = EINVAL;                                 \
 682                 goto bypass;                                    \
 683         }                                                       \
 684         if ((m)->m_len < (pullup_len) &&                        \
 685            (((m) = m_pullup((m),(pullup_len))) == NULL)) {      \
 686                 error = ENOBUFS;                                \
 687                 goto done;                                      \
 688         }                                                       \
 689 } while (0)
 690
 691         switch (iface->info.ifinfo_dlt) {
 692         case DLT_EN10MB:        /* Ethernet */
 693             {
 694                 struct ether_header *eh;
 695                 uint16_t etype;
 696
 697                 M_CHECK(sizeof(struct ether_header));
 698                 eh = mtod(m, struct ether_header *);
 699
 700                 /* Make sure this is IP frame. */
 701                 etype = ntohs(eh->ether_type);
 702                 switch (etype) {
 703                 case ETHERTYPE_IP:
 704                         M_CHECK(sizeof(struct ip));
 705                         eh = mtod(m, struct ether_header *);
 706                         ip = (struct ip *)(eh + 1);
 707                         l3_off = sizeof(struct ether_header);
 708                         break;
 709 #ifdef INET6
 710                 case ETHERTYPE_IPV6:
 711                         /*
 712                          * m_pullup() called by M_CHECK() pullups
 713                          * kern.ipc.max_protohdr (default 60 bytes)
 714                          * which is enough.
 715                          */
 716                         M_CHECK(sizeof(struct ip6_hdr));
 717                         eh = mtod(m, struct ether_header *);
 718                         ip6 = (struct ip6_hdr *)(eh + 1);
 719                         l3_off = sizeof(struct ether_header);
 720                         break;
 721 #endif
 722                 case ETHERTYPE_VLAN:
 723                     {
 724                         struct ether_vlan_header *evh;
 725
 726                         M_CHECK(sizeof(struct ether_vlan_header) -
 727                             sizeof(struct ether_header));
 728                         evh = mtod(m, struct ether_vlan_header *);
 729                         etype = ntohs(evh->evl_proto);
 730                         l3_off = sizeof(struct ether_vlan_header);
 731
 732                         if (etype == ETHERTYPE_IP) {
 733                                 M_CHECK(sizeof(struct ip));
 734                                 ip = (struct ip *)(evh + 1);
 735                                 break;
 736 #ifdef INET6
 737                         } else if (etype == ETHERTYPE_IPV6) {
 738                                 M_CHECK(sizeof(struct ip6_hdr));
 739                                 ip6 = (struct ip6_hdr *)(evh + 1);
 740                                 break;
 741 #endif
 742                         }
 743                     }
 744                 default:
 745                         goto bypass;    /* pass this frame */
 746                 }
 747                 break;
 748             }
 749         case DLT_RAW:           /* IP packets */
 750                 M_CHECK(sizeof(struct ip));
 751                 ip = mtod(m, struct ip *);
 752                 /* l3_off is already zero */
 753 #ifdef INET6
 754                 /*
 755                  * If INET6 is not defined IPv6 packets
 756                  * will be discarded in ng_netflow_flow_add().
 757                  */
 758                 if (ip->ip_v == IP6VERSION) {
 759                         ip = NULL;
 760                         M_CHECK(sizeof(struct ip6_hdr) - sizeof(struct ip));
 761                         ip6 = mtod(m, struct ip6_hdr *);
 762                 }
 763 #endif
 764                 break;
 765         default:
 766                 goto bypass;
 767                 break;
 768         }
 769
 770         off = pullup_len;
 771
 772         if ((ip != NULL) && ((ip->ip_off & htons(IP_OFFMASK)) == 0)) {
 773                 if ((ip->ip_v != IPVERSION) ||
 774                     ((ip->ip_hl << 2) < sizeof(struct ip)))
 775                         goto bypass;
 776                 /*
 777                  * In case of IPv4 header with options, we haven't pulled
 778                  * up enough, yet.
 779                  */
 780                 M_CHECK((ip->ip_hl << 2) - sizeof(struct ip));
 781
 782                 /* Save upper layer offset and proto */
 783                 off = pullup_len;
 784                 upper_proto = ip->ip_p;
 785
 786                 /*
 787                  * XXX: in case of wrong upper layer header we will
 788                  * forward this packet but skip this record in netflow.
 789                  */
 790                 switch (ip->ip_p) {
 791                 case IPPROTO_TCP:
 792                         M_CHECK(sizeof(struct tcphdr));
 793                         break;
 794                 case IPPROTO_UDP:
 795                         M_CHECK(sizeof(struct udphdr));
 796                         break;
 797                 case IPPROTO_SCTP:
 798                         M_CHECK(sizeof(struct sctphdr));
 799                         break;
 800                 }
 801         } else if (ip != NULL) {
 802                 /*
 803                  * Nothing to save except upper layer proto,
 804                  * since this is a packet fragment.
 805                  */
 806                 flags |= NG_NETFLOW_IS_FRAG;
 807                 upper_proto = ip->ip_p;
 808                 if ((ip->ip_v != IPVERSION) ||
 809                     ((ip->ip_hl << 2) < sizeof(struct ip)))
 810                         goto bypass;
 811 #ifdef INET6
 812         } else if (ip6 != NULL) {
 813                 int cur = ip6->ip6_nxt, hdr_off = 0;
 814                 struct ip6_ext *ip6e;
 815                 struct ip6_frag *ip6f;
 816
 817                 if (priv->export9 == NULL)
 818                         goto bypass;
 819
 820                 /* Save upper layer info. */
 821                 off = pullup_len;
 822                 upper_proto = cur;
 823
 824                 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION)
 825                         goto bypass;
 826
 827                 /*
 828                  * Loop through IPv6 extended headers to get upper
 829                  * layer header / frag.
 830                  */
 831                 for (;;) {
 832                         switch (cur) {
 833                         /*
 834                          * Same as in IPv4, we can forward a 'bad'
 835                          * packet without accounting.
 836                          */
 837                         case IPPROTO_TCP:
 838                                 M_CHECK(sizeof(struct tcphdr));
 839                                 goto loopend;
 840                         case IPPROTO_UDP:
 841                                 M_CHECK(sizeof(struct udphdr));
 842                                 goto loopend;
 843                         case IPPROTO_SCTP:
 844                                 M_CHECK(sizeof(struct sctphdr));
 845                                 goto loopend;
 846
 847                         /* Loop until 'real' upper layer headers */
 848                         case IPPROTO_HOPOPTS:
 849                         case IPPROTO_ROUTING:
 850                         case IPPROTO_DSTOPTS:
 851                                 M_CHECK(sizeof(struct ip6_ext));
 852                                 ip6e = (struct ip6_ext *)(mtod(m, caddr_t) +
 853                                     off);
 854                                 upper_proto = ip6e->ip6e_nxt;
 855                                 hdr_off = (ip6e->ip6e_len + 1) << 3;
 856                                 break;
 857
 858                         /* RFC4302, can be before DSTOPTS */
 859                         case IPPROTO_AH:
 860                                 M_CHECK(sizeof(struct ip6_ext));
 861                                 ip6e = (struct ip6_ext *)(mtod(m, caddr_t) +
 862                                     off);
 863                                 upper_proto = ip6e->ip6e_nxt;
 864                                 hdr_off = (ip6e->ip6e_len + 2) << 2;
 865                                 break;
 866
 867                         case IPPROTO_FRAGMENT:
 868                                 M_CHECK(sizeof(struct ip6_frag));
 869                                 ip6f = (struct ip6_frag *)(mtod(m, caddr_t) +
 870                                     off);
 871                                 upper_proto = ip6f->ip6f_nxt;
 872                                 hdr_off = sizeof(struct ip6_frag);
 873                                 off += hdr_off;
 874                                 flags |= NG_NETFLOW_IS_FRAG;
 875                                 goto loopend;
 876
 877 #if 0
 878                         case IPPROTO_NONE:
 879                                 goto loopend;
 880 #endif
 881                         /*
 882                          * Any unknown header (new extension or IPv6/IPv4
 883                          * header for tunnels) ends loop.
 884                          */
 885                         default:
 886                                 goto loopend;
 887                         }
 888
 889                         off += hdr_off;
 890                         cur = upper_proto;
 891                 }
 892 #endif
 893         }
 894 #undef  M_CHECK
 895
 896 #ifdef INET6
 897 loopend:
 898 #endif
 899         /* Just in case of real reallocation in M_CHECK() / m_pullup() */
 900         if (m != m_old) {
 901                 priv->nfinfo_realloc_mbuf++;
 902                 /* Restore ip/ipv6 pointer */
 903                 if (ip != NULL)
 904                         ip = (struct ip *)(mtod(m, caddr_t) + l3_off);
 905                 else if (ip6 != NULL)
 906                         ip6 = (struct ip6_hdr *)(mtod(m, caddr_t) + l3_off);
 907         }
 908
 909         upper_ptr = (caddr_t)(mtod(m, caddr_t) + off);
 910
 911         /* Determine packet input interface. Prefer configured. */
 912         src_if_index = 0;
 913         if (hook == iface->out || iface->info.ifinfo_index == 0) {
 914                 if (m->m_pkthdr.rcvif != NULL)
 915                         src_if_index = m->m_pkthdr.rcvif->if_index;
 916         } else
 917                 src_if_index = iface->info.ifinfo_index;
 918
 919         /* Check packet FIB */
 920         fib = M_GETFIB(m);
 921         if (fib >= priv->maxfibs) {
 922                 CTR2(KTR_NET, "ng_netflow_rcvdata(): packet fib %d is out of "
 923                     "range of available fibs: 0 .. %d",
 924                     fib, priv->maxfibs);
 925                 goto bypass;
 926         }
 927
 928         if ((fe = priv_to_fib(priv, fib)) == NULL) {
 929                 /* Setup new FIB */
 930                 if (ng_netflow_fib_init(priv, fib) != 0) {
 931                         /* malloc() failed */
 932                         goto bypass;
 933                 }
 934
 935                 fe = priv_to_fib(priv, fib);
 936         }
 937
 938         if (ip != NULL)
 939                 error = ng_netflow_flow_add(priv, fe, ip, upper_ptr,
 940                     upper_proto, flags, src_if_index);
 941 #ifdef INET6
 942         else if (ip6 != NULL)
 943                 error = ng_netflow_flow6_add(priv, fe, ip6, upper_ptr,
 944                     upper_proto, flags, src_if_index);
 945 #endif
 946         else
 947                 goto bypass;
 948
 949         acct = 1;
 950 bypass:
 951         if (out != NULL) {
 952                 if (acct == 0) {
 953                         /* Accounting failure */
 954                         if (ip != NULL) {
 955                                 counter_u64_add(priv->nfinfo_spackets, 1);
 956                                 counter_u64_add(priv->nfinfo_sbytes,
 957                                     m->m_pkthdr.len);
 958                         } else if (ip6 != NULL) {
 959                                 counter_u64_add(priv->nfinfo_spackets6, 1);
 960                                 counter_u64_add(priv->nfinfo_sbytes6,
 961                                     m->m_pkthdr.len);
 962                         }
 963                 }
 964
 965                 /* XXX: error gets overwritten here */
 966                 NG_FWD_NEW_DATA(error, item, out, m);
 967                 return (error);
 968         }
 969 done:
 970         if (item)
 971                 NG_FREE_ITEM(item);
 972         if (m)
 973                 NG_FREE_M(m);
 974
 975         return (error);
 976 }
 977
 978 /* We will be shut down in a moment */
 979 static int
 980 ng_netflow_close(node_p node)
 981 {
 982         const priv_p priv = NG_NODE_PRIVATE(node);
 983
 984         callout_drain(&priv->exp_callout);
 985         ng_netflow_cache_flush(priv);
 986
 987         return (0);
 988 }
 989
 990 /* Do local shutdown processing. */
 991 static int
 992 ng_netflow_rmnode(node_p node)
 993 {
 994         const priv_p priv = NG_NODE_PRIVATE(node);
 995
 996         NG_NODE_SET_PRIVATE(node, NULL);
 997         NG_NODE_UNREF(priv->node);
 998
 999         free(priv->fib_data, M_NETGRAPH);
1000         free(priv, M_NETGRAPH);
1001
1002         return (0);
1003 }
1004
1005 /* Hook disconnection. */
1006 static int
1007 ng_netflow_disconnect(hook_p hook)
1008 {
1009         node_p node = NG_HOOK_NODE(hook);
1010         priv_p priv = NG_NODE_PRIVATE(node);
1011         iface_p iface = NG_HOOK_PRIVATE(hook);
1012
1013         if (iface != NULL) {
1014                 if (iface->hook == hook)
1015                         iface->hook = NULL;
1016                 if (iface->out == hook)
1017                         iface->out = NULL;
1018         }
1019
1020         /* if export hook disconnected stop running expire(). */
1021         if (hook == priv->export) {
1022                 if (priv->export9 == NULL)
1023                         callout_drain(&priv->exp_callout);
1024                 priv->export = NULL;
1025         }
1026
1027         if (hook == priv->export9) {
1028                 if (priv->export == NULL)
1029                         callout_drain(&priv->exp_callout);
1030                 priv->export9 = NULL;
1031         }
1032
1033         /* Removal of the last link destroys the node. */
1034         if (NG_NODE_NUMHOOKS(node) == 0)
1035                 ng_rmnode_self(node);
1036
1037         return (0);
1038 }