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 /* Parse type for struct ng_netflow_v9info */
 142 static const struct ng_parse_struct_field ng_netflow_v9info_type_fields[]
 143         = NG_NETFLOW_V9INFO_TYPE;
 144 static const struct ng_parse_type ng_netflow_v9info_type = {
 145         &ng_parse_struct_type,
 146         &ng_netflow_v9info_type_fields
 147 };
 148
 149 /* List of commands and how to convert arguments to/from ASCII */
 150 static const struct ng_cmdlist ng_netflow_cmds[] = {
 151        {
 152          NGM_NETFLOW_COOKIE,
 153          NGM_NETFLOW_INFO,
 154          "info",
 155          NULL,
 156          &ng_netflow_info_type
 157        },
 158        {
 159         NGM_NETFLOW_COOKIE,
 160         NGM_NETFLOW_IFINFO,
 161         "ifinfo",
 162         &ng_parse_uint16_type,
 163         &ng_netflow_ifinfo_type
 164        },
 165        {
 166         NGM_NETFLOW_COOKIE,
 167         NGM_NETFLOW_SETDLT,
 168         "setdlt",
 169         &ng_netflow_setdlt_type,
 170         NULL
 171        },
 172        {
 173         NGM_NETFLOW_COOKIE,
 174         NGM_NETFLOW_SETIFINDEX,
 175         "setifindex",
 176         &ng_netflow_setifindex_type,
 177         NULL
 178        },
 179        {
 180         NGM_NETFLOW_COOKIE,
 181         NGM_NETFLOW_SETTIMEOUTS,
 182         "settimeouts",
 183         &ng_netflow_settimeouts_type,
 184         NULL
 185        },
 186        {
 187         NGM_NETFLOW_COOKIE,
 188         NGM_NETFLOW_SETCONFIG,
 189         "setconfig",
 190         &ng_netflow_setconfig_type,
 191         NULL
 192        },
 193        {
 194         NGM_NETFLOW_COOKIE,
 195         NGM_NETFLOW_SETTEMPLATE,
 196         "settemplate",
 197         &ng_netflow_settemplate_type,
 198         NULL
 199        },
 200        {
 201         NGM_NETFLOW_COOKIE,
 202         NGM_NETFLOW_SETMTU,
 203         "setmtu",
 204         &ng_netflow_setmtu_type,
 205         NULL
 206        },
 207        {
 208          NGM_NETFLOW_COOKIE,
 209          NGM_NETFLOW_V9INFO,
 210          "v9info",
 211          NULL,
 212          &ng_netflow_v9info_type
 213        },
 214        { 0 }
 215 };
 216
 217
 218 /* Netgraph node type descriptor */
 219 static struct ng_type ng_netflow_typestruct = {
 220         .version =      NG_ABI_VERSION,
 221         .name =         NG_NETFLOW_NODE_TYPE,
 222         .constructor =  ng_netflow_constructor,
 223         .rcvmsg =       ng_netflow_rcvmsg,
 224         .close =        ng_netflow_close,
 225         .shutdown =     ng_netflow_rmnode,
 226         .newhook =      ng_netflow_newhook,
 227         .rcvdata =      ng_netflow_rcvdata,
 228         .disconnect =   ng_netflow_disconnect,
 229         .cmdlist =      ng_netflow_cmds,
 230 };
 231 NETGRAPH_INIT(netflow, &ng_netflow_typestruct);
 232
 233 /* Called at node creation */
 234 static int
 235 ng_netflow_constructor(node_p node)
 236 {
 237         priv_p priv;
 238         int i;
 239
 240         /* Initialize private data */
 241         priv = malloc(sizeof(*priv), M_NETGRAPH, M_WAITOK | M_ZERO);
 242
 243         /* Initialize fib data */
 244         priv->maxfibs = rt_numfibs;
 245         priv->fib_data = malloc(sizeof(fib_export_p) * priv->maxfibs,
 246             M_NETGRAPH, M_WAITOK | M_ZERO);
 247
 248         /* Make node and its data point at each other */
 249         NG_NODE_SET_PRIVATE(node, priv);
 250         priv->node = node;
 251
 252         /* Initialize timeouts to default values */
 253         priv->info.nfinfo_inact_t = INACTIVE_TIMEOUT;
 254         priv->info.nfinfo_act_t = ACTIVE_TIMEOUT;
 255
 256         /* Set default config */
 257         for (i = 0; i < NG_NETFLOW_MAXIFACES; i++)
 258                 priv->ifaces[i].info.conf = NG_NETFLOW_CONF_INGRESS;
 259
 260         /* Initialize callout handle */
 261         callout_init(&priv->exp_callout, CALLOUT_MPSAFE);
 262
 263         /* Allocate memory and set up flow cache */
 264         ng_netflow_cache_init(priv);
 265
 266         return (0);
 267 }
 268
 269 /*
 270  * ng_netflow supports two hooks: data and export.
 271  * Incoming traffic is expected on data, and expired
 272  * netflow datagrams are sent to export.
 273  */
 274 static int
 275 ng_netflow_newhook(node_p node, hook_p hook, const char *name)
 276 {
 277         const priv_p priv = NG_NODE_PRIVATE(node);
 278
 279         if (strncmp(name, NG_NETFLOW_HOOK_DATA, /* an iface hook? */
 280             strlen(NG_NETFLOW_HOOK_DATA)) == 0) {
 281                 iface_p iface;
 282                 int ifnum = -1;
 283                 const char *cp;
 284                 char *eptr;
 285
 286                 cp = name + strlen(NG_NETFLOW_HOOK_DATA);
 287                 if (!isdigit(*cp) || (cp[0] == '0' && cp[1] != '\0'))
 288                         return (EINVAL);
 289
 290                 ifnum = (int)strtoul(cp, &eptr, 10);
 291                 if (*eptr != '\0' || ifnum < 0 || ifnum >= NG_NETFLOW_MAXIFACES)
 292                         return (EINVAL);
 293
 294                 /* See if hook is already connected */
 295                 if (priv->ifaces[ifnum].hook != NULL)
 296                         return (EISCONN);
 297
 298                 iface = &priv->ifaces[ifnum];
 299
 300                 /* Link private info and hook together */
 301                 NG_HOOK_SET_PRIVATE(hook, iface);
 302                 iface->hook = hook;
 303
 304                 /*
 305                  * In most cases traffic accounting is done on an
 306                  * Ethernet interface, so default data link type
 307                  * will be DLT_EN10MB.
 308                  */
 309                 iface->info.ifinfo_dlt = DLT_EN10MB;
 310
 311         } else if (strncmp(name, NG_NETFLOW_HOOK_OUT,
 312             strlen(NG_NETFLOW_HOOK_OUT)) == 0) {
 313                 iface_p iface;
 314                 int ifnum = -1;
 315                 const char *cp;
 316                 char *eptr;
 317
 318                 cp = name + strlen(NG_NETFLOW_HOOK_OUT);
 319                 if (!isdigit(*cp) || (cp[0] == '0' && cp[1] != '\0'))
 320                         return (EINVAL);
 321
 322                 ifnum = (int)strtoul(cp, &eptr, 10);
 323                 if (*eptr != '\0' || ifnum < 0 || ifnum >= NG_NETFLOW_MAXIFACES)
 324                         return (EINVAL);
 325
 326                 /* See if hook is already connected */
 327                 if (priv->ifaces[ifnum].out != NULL)
 328                         return (EISCONN);
 329
 330                 iface = &priv->ifaces[ifnum];
 331
 332                 /* Link private info and hook together */
 333                 NG_HOOK_SET_PRIVATE(hook, iface);
 334                 iface->out = hook;
 335
 336         } else if (strcmp(name, NG_NETFLOW_HOOK_EXPORT) == 0) {
 337
 338                 if (priv->export != NULL)
 339                         return (EISCONN);
 340
 341                 /* Netflow version 5 supports 32-bit counters only */
 342                 if (CNTR_MAX == UINT64_MAX)
 343                         return (EINVAL);
 344
 345                 priv->export = hook;
 346
 347                 /* Exporter is ready. Let's schedule expiry. */
 348                 callout_reset(&priv->exp_callout, (1*hz), &ng_netflow_expire,
 349                     (void *)priv);
 350         } else if (strcmp(name, NG_NETFLOW_HOOK_EXPORT9) == 0) {
 351
 352                 if (priv->export9 != NULL)
 353                         return (EISCONN);
 354
 355                 priv->export9 = hook;
 356
 357                 /* Exporter is ready. Let's schedule expiry. */
 358                 callout_reset(&priv->exp_callout, (1*hz), &ng_netflow_expire,
 359                     (void *)priv);
 360         } else
 361                 return (EINVAL);
 362
 363         return (0);
 364 }
 365
 366 /* Get a netgraph control message. */
 367 static int
 368 ng_netflow_rcvmsg (node_p node, item_p item, hook_p lasthook)
 369 {
 370         const priv_p priv = NG_NODE_PRIVATE(node);
 371         struct ng_mesg *resp = NULL;
 372         int error = 0;
 373         struct ng_mesg *msg;
 374
 375         NGI_GET_MSG(item, msg);
 376
 377         /* Deal with message according to cookie and command */
 378         switch (msg->header.typecookie) {
 379         case NGM_NETFLOW_COOKIE:
 380                 switch (msg->header.cmd) {
 381                 case NGM_NETFLOW_INFO:
 382                 {
 383                         struct ng_netflow_info *i;
 384
 385                         NG_MKRESPONSE(resp, msg, sizeof(struct ng_netflow_info),
 386                             M_NOWAIT);
 387                         i = (struct ng_netflow_info *)resp->data;
 388                         ng_netflow_copyinfo(priv, i);
 389
 390                         break;
 391                 }
 392                 case NGM_NETFLOW_IFINFO:
 393                 {
 394                         struct ng_netflow_ifinfo *i;
 395                         const uint16_t *index;
 396
 397                         if (msg->header.arglen != sizeof(uint16_t))
 398                                  ERROUT(EINVAL);
 399
 400                         index  = (uint16_t *)msg->data;
 401                         if (*index >= NG_NETFLOW_MAXIFACES)
 402                                 ERROUT(EINVAL);
 403
 404                         /* connected iface? */
 405                         if (priv->ifaces[*index].hook == NULL)
 406                                  ERROUT(EINVAL);
 407
 408                         NG_MKRESPONSE(resp, msg,
 409                              sizeof(struct ng_netflow_ifinfo), M_NOWAIT);
 410                         i = (struct ng_netflow_ifinfo *)resp->data;
 411                         memcpy((void *)i, (void *)&priv->ifaces[*index].info,
 412                             sizeof(priv->ifaces[*index].info));
 413
 414                         break;
 415                 }
 416                 case NGM_NETFLOW_SETDLT:
 417                 {
 418                         struct ng_netflow_setdlt *set;
 419                         struct ng_netflow_iface *iface;
 420
 421                         if (msg->header.arglen != sizeof(struct ng_netflow_setdlt))
 422                                 ERROUT(EINVAL);
 423
 424                         set = (struct ng_netflow_setdlt *)msg->data;
 425                         if (set->iface >= NG_NETFLOW_MAXIFACES)
 426                                 ERROUT(EINVAL);
 427                         iface = &priv->ifaces[set->iface];
 428
 429                         /* connected iface? */
 430                         if (iface->hook == NULL)
 431                                 ERROUT(EINVAL);
 432
 433                         switch (set->dlt) {
 434                         case    DLT_EN10MB:
 435                                 iface->info.ifinfo_dlt = DLT_EN10MB;
 436                                 break;
 437                         case    DLT_RAW:
 438                                 iface->info.ifinfo_dlt = DLT_RAW;
 439                                 break;
 440                         default:
 441                                 ERROUT(EINVAL);
 442                         }
 443                         break;
 444                 }
 445                 case NGM_NETFLOW_SETIFINDEX:
 446                 {
 447                         struct ng_netflow_setifindex *set;
 448                         struct ng_netflow_iface *iface;
 449
 450                         if (msg->header.arglen != sizeof(struct ng_netflow_setifindex))
 451                                 ERROUT(EINVAL);
 452
 453                         set = (struct ng_netflow_setifindex *)msg->data;
 454                         if (set->iface >= NG_NETFLOW_MAXIFACES)
 455                                 ERROUT(EINVAL);
 456                         iface = &priv->ifaces[set->iface];
 457
 458                         /* connected iface? */
 459                         if (iface->hook == NULL)
 460                                 ERROUT(EINVAL);
 461
 462                         iface->info.ifinfo_index = set->index;
 463
 464                         break;
 465                 }
 466                 case NGM_NETFLOW_SETTIMEOUTS:
 467                 {
 468                         struct ng_netflow_settimeouts *set;
 469
 470                         if (msg->header.arglen != sizeof(struct ng_netflow_settimeouts))
 471                                 ERROUT(EINVAL);
 472
 473                         set = (struct ng_netflow_settimeouts *)msg->data;
 474
 475                         priv->info.nfinfo_inact_t = set->inactive_timeout;
 476                         priv->info.nfinfo_act_t = set->active_timeout;
 477
 478                         break;
 479                 }
 480                 case NGM_NETFLOW_SETCONFIG:
 481                 {
 482                         struct ng_netflow_setconfig *set;
 483
 484                         if (msg->header.arglen != sizeof(struct ng_netflow_setconfig))
 485                                 ERROUT(EINVAL);
 486
 487                         set = (struct ng_netflow_setconfig *)msg->data;
 488
 489                         if (set->iface >= NG_NETFLOW_MAXIFACES)
 490                                 ERROUT(EINVAL);
 491
 492                         priv->ifaces[set->iface].info.conf = set->conf;
 493
 494                         break;
 495                 }
 496                 case NGM_NETFLOW_SETTEMPLATE:
 497                 {
 498                         struct ng_netflow_settemplate *set;
 499
 500                         if (msg->header.arglen != sizeof(struct ng_netflow_settemplate))
 501                                 ERROUT(EINVAL);
 502
 503                         set = (struct ng_netflow_settemplate *)msg->data;
 504
 505                         priv->templ_packets = set->packets;
 506                         priv->templ_time = set->time;
 507
 508                         break;
 509                 }
 510                 case NGM_NETFLOW_SETMTU:
 511                 {
 512                         struct ng_netflow_setmtu *set;
 513
 514                         if (msg->header.arglen != sizeof(struct ng_netflow_setmtu))
 515                                 ERROUT(EINVAL);
 516
 517                         set = (struct ng_netflow_setmtu *)msg->data;
 518                         if ((set->mtu < MIN_MTU) || (set->mtu > MAX_MTU))
 519                                 ERROUT(EINVAL);
 520
 521                         priv->mtu = set->mtu;
 522
 523                         break;
 524                 }
 525                 case NGM_NETFLOW_SHOW:
 526                 {
 527                         if (msg->header.arglen != sizeof(struct ngnf_show_header))
 528                                 ERROUT(EINVAL);
 529
 530                         NG_MKRESPONSE(resp, msg, NGRESP_SIZE, M_NOWAIT);
 531
 532                         if (!resp)
 533                                 ERROUT(ENOMEM);
 534
 535                         error = ng_netflow_flow_show(priv,
 536                             (struct ngnf_show_header *)msg->data,
 537                             (struct ngnf_show_header *)resp->data);
 538
 539                         if (error)
 540                                 NG_FREE_MSG(resp);
 541
 542                         break;
 543                 }
 544                 case NGM_NETFLOW_V9INFO:
 545                 {
 546                         struct ng_netflow_v9info *i;
 547
 548                         NG_MKRESPONSE(resp, msg, sizeof(struct ng_netflow_v9info),
 549                             M_NOWAIT);
 550                         i = (struct ng_netflow_v9info *)resp->data;
 551                         ng_netflow_copyv9info(priv, i);
 552
 553                         break;
 554                 }
 555                 default:
 556                         ERROUT(EINVAL);         /* unknown command */
 557                         break;
 558                 }
 559                 break;
 560         default:
 561                 ERROUT(EINVAL);         /* incorrect cookie */
 562                 break;
 563         }
 564
 565         /*
 566          * Take care of synchronous response, if any.
 567          * Free memory and return.
 568          */
 569 done:
 570         NG_RESPOND_MSG(error, node, item, resp);
 571         NG_FREE_MSG(msg);
 572
 573         return (error);
 574 }
 575
 576 /* Receive data on hook. */
 577 static int
 578 ng_netflow_rcvdata (hook_p hook, item_p item)
 579 {
 580         const node_p node = NG_HOOK_NODE(hook);
 581         const priv_p priv = NG_NODE_PRIVATE(node);
 582         const iface_p iface = NG_HOOK_PRIVATE(hook);
 583         hook_p out;
 584         struct mbuf *m = NULL, *m_old = NULL;
 585         struct ip *ip = NULL;
 586         struct ip6_hdr *ip6 = NULL;
 587         struct m_tag *mtag;
 588         int pullup_len = 0, off;
 589         uint8_t acct = 0, bypass = 0, is_frag = 0, upper_proto = 0;
 590         int error = 0, l3_off = 0;
 591         unsigned int src_if_index;
 592         caddr_t upper_ptr = NULL;
 593         fib_export_p fe;
 594         uint32_t fib;
 595
 596         if ((hook == priv->export) || (hook == priv->export9)) {
 597                 /*
 598                  * Data arrived on export hook.
 599                  * This must not happen.
 600                  */
 601                 log(LOG_ERR, "ng_netflow: incoming data on export hook!\n");
 602                 ERROUT(EINVAL);
 603         };
 604
 605         if (hook == iface->hook) {
 606                 if ((iface->info.conf & NG_NETFLOW_CONF_INGRESS) == 0)
 607                         bypass = 1;
 608                 out = iface->out;
 609         } else if (hook == iface->out) {
 610                 if ((iface->info.conf & NG_NETFLOW_CONF_EGRESS) == 0)
 611                         bypass = 1;
 612                 out = iface->hook;
 613         } else
 614                 ERROUT(EINVAL);
 615
 616         if ((!bypass) &&
 617             (iface->info.conf & (NG_NETFLOW_CONF_ONCE | NG_NETFLOW_CONF_THISONCE))) {
 618                 mtag = m_tag_locate(NGI_M(item), MTAG_NETFLOW,
 619                     MTAG_NETFLOW_CALLED, NULL);
 620                 while (mtag != NULL) {
 621                         if ((iface->info.conf & NG_NETFLOW_CONF_ONCE) ||
 622                             ((ng_ID_t *)(mtag + 1))[0] == NG_NODE_ID(node)) {
 623                                 bypass = 1;
 624                                 break;
 625                         }
 626                         mtag = m_tag_locate(NGI_M(item), MTAG_NETFLOW,
 627                             MTAG_NETFLOW_CALLED, mtag);
 628                 }
 629         }
 630
 631         if (bypass) {
 632                 if (out == NULL)
 633                         ERROUT(ENOTCONN);
 634
 635                 NG_FWD_ITEM_HOOK(error, item, out);
 636                 return (error);
 637         }
 638
 639         if (iface->info.conf & (NG_NETFLOW_CONF_ONCE | NG_NETFLOW_CONF_THISONCE)) {
 640                 mtag = m_tag_alloc(MTAG_NETFLOW, MTAG_NETFLOW_CALLED,
 641                     sizeof(ng_ID_t), M_NOWAIT);
 642                 if (mtag) {
 643                         ((ng_ID_t *)(mtag + 1))[0] = NG_NODE_ID(node);
 644                         m_tag_prepend(NGI_M(item), mtag);
 645                 }
 646         }
 647
 648         NGI_GET_M(item, m);
 649         m_old = m;
 650
 651         /* Increase counters. */
 652         iface->info.ifinfo_packets++;
 653
 654         /*
 655          * Depending on interface data link type and packet contents
 656          * we pullup enough data, so that ng_netflow_flow_add() does not
 657          * need to know about mbuf at all. We keep current length of data
 658          * needed to be contiguous in pullup_len. mtod() is done at the
 659          * very end one more time, since m can had changed after pulluping.
 660          *
 661          * In case of unrecognized data we don't return error, but just
 662          * pass data to downstream hook, if it is available.
 663          */
 664
 665 #define M_CHECK(length) do {                                    \
 666         pullup_len += length;                                   \
 667         if (((m)->m_pkthdr.len < (pullup_len)) ||               \
 668            ((pullup_len) > MHLEN)) {                            \
 669                 error = EINVAL;                                 \
 670                 goto bypass;                                    \
 671         }                                                       \
 672         if ((m)->m_len < (pullup_len) &&                        \
 673            (((m) = m_pullup((m),(pullup_len))) == NULL)) {      \
 674                 error = ENOBUFS;                                \
 675                 goto done;                                      \
 676         }                                                       \
 677 } while (0)
 678
 679         switch (iface->info.ifinfo_dlt) {
 680         case DLT_EN10MB:        /* Ethernet */
 681             {
 682                 struct ether_header *eh;
 683                 uint16_t etype;
 684
 685                 M_CHECK(sizeof(struct ether_header));
 686                 eh = mtod(m, struct ether_header *);
 687
 688                 /* Make sure this is IP frame. */
 689                 etype = ntohs(eh->ether_type);
 690                 switch (etype) {
 691                 case ETHERTYPE_IP:
 692                         M_CHECK(sizeof(struct ip));
 693                         eh = mtod(m, struct ether_header *);
 694                         ip = (struct ip *)(eh + 1);
 695                         l3_off = sizeof(struct ether_header);
 696                         break;
 697 #ifdef INET6
 698                 case ETHERTYPE_IPV6:
 699                         /*
 700                          * m_pullup() called by M_CHECK() pullups
 701                          * kern.ipc.max_protohdr (default 60 bytes) which is enough
 702                          */
 703                         M_CHECK(sizeof(struct ip6_hdr));
 704                         eh = mtod(m, struct ether_header *);
 705                         ip6 = (struct ip6_hdr *)(eh + 1);
 706                         l3_off = sizeof(struct ether_header);
 707                         break;
 708 #endif
 709                 case ETHERTYPE_VLAN:
 710                     {
 711                         struct ether_vlan_header *evh;
 712
 713                         M_CHECK(sizeof(struct ether_vlan_header) -
 714                             sizeof(struct ether_header));
 715                         evh = mtod(m, struct ether_vlan_header *);
 716                         etype = ntohs(evh->evl_proto);
 717                         l3_off = sizeof(struct ether_vlan_header);
 718
 719                         if (etype == ETHERTYPE_IP) {
 720                                 M_CHECK(sizeof(struct ip));
 721                                 ip = (struct ip *)(evh + 1);
 722                                 break;
 723 #ifdef INET6
 724                         } else if (etype == ETHERTYPE_IPV6) {
 725                                 M_CHECK(sizeof(struct ip6_hdr));
 726                                 ip6 = (struct ip6_hdr *)(evh + 1);
 727                                 break;
 728 #endif
 729                         }
 730                     }
 731                 default:
 732                         goto bypass;    /* pass this frame */
 733                 }
 734                 break;
 735             }
 736         case DLT_RAW:           /* IP packets */
 737                 M_CHECK(sizeof(struct ip));
 738                 ip = mtod(m, struct ip *);
 739                 /* l3_off is already zero */
 740 #ifdef INET6
 741                 /* If INET6 is not defined IPv6 packets will be discarded in ng_netflow_flow_add() */
 742                 if (ip->ip_v == IP6VERSION) {
 743                         /* IPv6 packet */
 744                         ip = NULL;
 745                         M_CHECK(sizeof(struct ip6_hdr) - sizeof(struct ip));
 746                         ip6 = mtod(m, struct ip6_hdr *);
 747                 }
 748 #endif
 749                 break;
 750         default:
 751                 goto bypass;
 752                 break;
 753         }
 754
 755         off = pullup_len;
 756
 757         if ((ip != NULL) && ((ip->ip_off & htons(IP_OFFMASK)) == 0)) {
 758                 if ((ip->ip_v != IPVERSION) ||
 759                     ((ip->ip_hl << 2) < sizeof(struct ip)))
 760                         goto bypass;
 761                 /*
 762                  * In case of IPv4 header with options, we haven't pulled
 763                  * up enough, yet.
 764                  */
 765                 M_CHECK((ip->ip_hl << 2) - sizeof(struct ip));
 766
 767                 /* Save upper layer offset and proto */
 768                 off = pullup_len;
 769                 upper_proto = ip->ip_p;
 770
 771                 /*
 772                  * XXX: in case of wrong upper layer header we will forward this packet
 773                  * but skip this record in netflow
 774                  */
 775                 switch (ip->ip_p) {
 776                 case IPPROTO_TCP:
 777                         M_CHECK(sizeof(struct tcphdr));
 778                         break;
 779                 case IPPROTO_UDP:
 780                         M_CHECK(sizeof(struct udphdr));
 781                         break;
 782                 case IPPROTO_SCTP:
 783                         M_CHECK(sizeof(struct sctphdr));
 784                         break;
 785                 }
 786         } else if (ip != NULL) {
 787                 /* Nothing to save except upper layer proto, since this is packet fragment */
 788                 is_frag = 1;
 789                 upper_proto = ip->ip_p;
 790                 if ((ip->ip_v != IPVERSION) ||
 791                     ((ip->ip_hl << 2) < sizeof(struct ip)))
 792                         goto bypass;
 793 #ifdef INET6
 794         } else if (ip6 != NULL) {
 795                 /* Check if we can export */
 796                 if (priv->export9 == NULL)
 797                         goto bypass;
 798
 799                 /* Loop thru IPv6 extended headers to get upper layer header / frag */
 800                 int cur = ip6->ip6_nxt, hdr_off = 0;
 801                 struct ip6_ext *ip6e;
 802                 struct ip6_frag *ip6f;
 803
 804                 /* Save upper layer info */
 805                 off = pullup_len;
 806                 upper_proto = cur;
 807
 808                 if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION)
 809                         goto bypass;
 810
 811                 while (42) {
 812                         switch (cur) {
 813                         /*
 814                          * Same as in IPv4, we can forward 'bad' packet without accounting
 815                          */
 816                         case IPPROTO_TCP:
 817                                 M_CHECK(sizeof(struct tcphdr));
 818                                 goto loopend;
 819                         case IPPROTO_UDP:
 820                                 M_CHECK(sizeof(struct udphdr));
 821                                 goto loopend;
 822                         case IPPROTO_SCTP:
 823                                 M_CHECK(sizeof(struct sctphdr));
 824                                 goto loopend;
 825
 826                         /* Loop until 'real' upper layer headers */
 827                         case IPPROTO_HOPOPTS:
 828                         case IPPROTO_ROUTING:
 829                         case IPPROTO_DSTOPTS:
 830                                 M_CHECK(sizeof(struct ip6_ext));
 831                                 ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + off);
 832                                 upper_proto = ip6e->ip6e_nxt;
 833                                 hdr_off = (ip6e->ip6e_len + 1) << 3;
 834                                 break;
 835
 836                         /* RFC4302, can be before DSTOPTS */
 837                         case IPPROTO_AH:
 838                                 M_CHECK(sizeof(struct ip6_ext));
 839                                 ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + off);
 840                                 upper_proto = ip6e->ip6e_nxt;
 841                                 hdr_off = (ip6e->ip6e_len + 2) << 2;
 842                                 break;
 843
 844                         case IPPROTO_FRAGMENT:
 845                                 M_CHECK(sizeof(struct ip6_frag));
 846                                 ip6f = (struct ip6_frag *)(mtod(m, caddr_t) + off);
 847                                 upper_proto = ip6f->ip6f_nxt;
 848                                 hdr_off = sizeof(struct ip6_frag);
 849                                 off += hdr_off;
 850                                 is_frag = 1;
 851                                 goto loopend;
 852
 853 #if 0
 854                         case IPPROTO_NONE:
 855                                 goto loopend;
 856 #endif
 857                         /*
 858                          * Any unknow header (new extension or IPv6/IPv4
 859                          * header for tunnels) ends loop.
 860                          */
 861                         default:
 862                                 goto loopend;
 863                         }
 864
 865                         off += hdr_off;
 866                         cur = upper_proto;
 867                 }
 868 #endif
 869         }
 870 #undef  M_CHECK
 871
 872 #ifdef INET6
 873 loopend:
 874 #endif
 875         /* Just in case of real reallocation in M_CHECK() / m_pullup() */
 876         if (m != m_old) {
 877                 atomic_fetchadd_32(&priv->info.nfinfo_realloc_mbuf, 1);
 878                 /* Restore ip/ipv6 pointer */
 879                 if (ip != NULL)
 880                         ip = (struct ip *)(mtod(m, caddr_t) + l3_off);
 881                 else if (ip6 != NULL)
 882                         ip6 = (struct ip6_hdr *)(mtod(m, caddr_t) + l3_off);
 883         }
 884
 885         upper_ptr = (caddr_t)(mtod(m, caddr_t) + off);
 886
 887         /* Determine packet input interface. Prefer configured. */
 888         src_if_index = 0;
 889         if (hook == iface->out || iface->info.ifinfo_index == 0) {
 890                 if (m->m_pkthdr.rcvif != NULL)
 891                         src_if_index = m->m_pkthdr.rcvif->if_index;
 892         } else
 893                 src_if_index = iface->info.ifinfo_index;
 894
 895         /* Check packet FIB */
 896         fib = M_GETFIB(m);
 897         if (fib >= priv->maxfibs) {
 898                 CTR2(KTR_NET, "ng_netflow_rcvdata(): packet fib %d is out of "
 899                     "range of available fibs: 0 .. %d",
 900                     fib, priv->maxfibs);
 901                 goto bypass;
 902         }
 903
 904         if ((fe = priv_to_fib(priv, fib)) == NULL) {
 905                 /* Setup new FIB */
 906                 if (ng_netflow_fib_init(priv, fib) != 0) {
 907                         /* malloc() failed */
 908                         goto bypass;
 909                 }
 910
 911                 fe = priv_to_fib(priv, fib);
 912         }
 913
 914         if (ip != NULL)
 915                 error = ng_netflow_flow_add(priv, fe, ip, upper_ptr, upper_proto, is_frag, src_if_index);
 916 #ifdef INET6
 917         else if (ip6 != NULL)
 918                 error = ng_netflow_flow6_add(priv, fe, ip6, upper_ptr, upper_proto, is_frag, src_if_index);
 919 #endif
 920         else
 921                 goto bypass;
 922
 923         acct = 1;
 924 bypass:
 925         if (out != NULL) {
 926                 if (acct == 0) {
 927                         /* Accounting failure */
 928                         if (ip != NULL) {
 929                                 atomic_fetchadd_32(&priv->info.nfinfo_spackets, 1);
 930                                 priv->info.nfinfo_sbytes += m_length(m, NULL);
 931                         } else if (ip6 != NULL) {
 932                                 atomic_fetchadd_32(&priv->info.nfinfo_spackets6, 1);
 933                                 priv->info.nfinfo_sbytes6 += m_length(m, NULL);
 934                         }
 935                 }
 936
 937                 /* XXX: error gets overwritten here */
 938                 NG_FWD_NEW_DATA(error, item, out, m);
 939                 return (error);
 940         }
 941 done:
 942         if (item)
 943                 NG_FREE_ITEM(item);
 944         if (m)
 945                 NG_FREE_M(m);
 946
 947         return (error);
 948 }
 949
 950 /* We will be shut down in a moment */
 951 static int
 952 ng_netflow_close(node_p node)
 953 {
 954         const priv_p priv = NG_NODE_PRIVATE(node);
 955
 956         callout_drain(&priv->exp_callout);
 957         ng_netflow_cache_flush(priv);
 958
 959         return (0);
 960 }
 961
 962 /* Do local shutdown processing. */
 963 static int
 964 ng_netflow_rmnode(node_p node)
 965 {
 966         const priv_p priv = NG_NODE_PRIVATE(node);
 967
 968         NG_NODE_SET_PRIVATE(node, NULL);
 969         NG_NODE_UNREF(priv->node);
 970
 971         free(priv->fib_data, M_NETGRAPH);
 972         free(priv, M_NETGRAPH);
 973
 974         return (0);
 975 }
 976
 977 /* Hook disconnection. */
 978 static int
 979 ng_netflow_disconnect(hook_p hook)
 980 {
 981         node_p node = NG_HOOK_NODE(hook);
 982         priv_p priv = NG_NODE_PRIVATE(node);
 983         iface_p iface = NG_HOOK_PRIVATE(hook);
 984
 985         if (iface != NULL) {
 986                 if (iface->hook == hook)
 987                         iface->hook = NULL;
 988                 if (iface->out == hook)
 989                         iface->out = NULL;
 990         }
 991
 992         /* if export hook disconnected stop running expire(). */
 993         if (hook == priv->export) {
 994                 if (priv->export9 == NULL)
 995                         callout_drain(&priv->exp_callout);
 996                 priv->export = NULL;
 997         }
 998
 999         if (hook == priv->export9) {
1000                 if (priv->export == NULL)
1001                         callout_drain(&priv->exp_callout);
1002                 priv->export9 = NULL;
1003         }
1004
1005         /* Removal of the last link destroys the node. */
1006         if (NG_NODE_NUMHOOKS(node) == 0)
1007                 ng_rmnode_self(node);
1008
1009         return (0);
1010 }