bgpd/bgp_snmp.c

   1 /* BGP4 SNMP support
   2    Copyright (C) 1999, 2000 Kunihiro Ishiguro
   3
   4 This file is part of GNU Zebra.
   5
   6 GNU Zebra is free software; you can redistribute it and/or modify it
   7 under the terms of the GNU General Public License as published by the
   8 Free Software Foundation; either version 2, or (at your option) any
   9 later version.
  10
  11 GNU Zebra is distributed in the hope that it will be useful, but
  12 WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14 General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU Zebra; see the file COPYING.  If not, write to the Free
  18 Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
  19 02111-1307, USA.  */
  20
  21 #include <zebra.h>
  22
  23 #ifdef HAVE_SNMP
  24 #include <net-snmp/net-snmp-config.h>
  25 #include <net-snmp/net-snmp-includes.h>
  26
  27 #include "if.h"
  28 #include "log.h"
  29 #include "prefix.h"
  30 #include "command.h"
  31 #include "thread.h"
  32 #include "smux.h"
  33 #include "filter.h"
  34
  35 #include "bgpd/bgpd.h"
  36 #include "bgpd/bgp_table.h"
  37 #include "bgpd/bgp_aspath.h"
  38 #include "bgpd/bgp_attr.h"
  39 #include "bgpd/bgp_route.h"
  40 #include "bgpd/bgp_fsm.h"
  41 #include "bgpd/bgp_snmp.h"
  42
  43 /* BGP4-MIB described in RFC1657. */
  44 #define BGP4MIB 1,3,6,1,2,1,15
  45
  46 /* BGP TRAP. */
  47 #define BGPESTABLISHED                  1
  48 #define BGPBACKWARDTRANSITION           2
  49
  50 /* BGP MIB bgpVersion. */
  51 #define BGPVERSION                            0
  52
  53 /* BGP MIB bgpLocalAs. */
  54 #define BGPLOCALAS                            0
  55
  56 /* BGP MIB bgpPeerTable. */
  57 #define BGPPEERIDENTIFIER                     1
  58 #define BGPPEERSTATE                          2
  59 #define BGPPEERADMINSTATUS                    3
  60 #define BGPPEERNEGOTIATEDVERSION              4
  61 #define BGPPEERLOCALADDR                      5
  62 #define BGPPEERLOCALPORT                      6
  63 #define BGPPEERREMOTEADDR                     7
  64 #define BGPPEERREMOTEPORT                     8
  65 #define BGPPEERREMOTEAS                       9
  66 #define BGPPEERINUPDATES                     10
  67 #define BGPPEEROUTUPDATES                    11
  68 #define BGPPEERINTOTALMESSAGES               12
  69 #define BGPPEEROUTTOTALMESSAGES              13
  70 #define BGPPEERLASTERROR                     14
  71 #define BGPPEERFSMESTABLISHEDTRANSITIONS     15
  72 #define BGPPEERFSMESTABLISHEDTIME            16
  73 #define BGPPEERCONNECTRETRYINTERVAL          17
  74 #define BGPPEERHOLDTIME                      18
  75 #define BGPPEERKEEPALIVE                     19
  76 #define BGPPEERHOLDTIMECONFIGURED            20
  77 #define BGPPEERKEEPALIVECONFIGURED           21
  78 #define BGPPEERMINROUTEADVERTISEMENTINTERVAL 22
  79 #define BGPPEERINUPDATEELAPSEDTIME           23
  80
  81 /* BGP MIB bgpIdentifier. */
  82 #define BGPIDENTIFIER                         0
  83
  84 /* BGP MIB bgpRcvdPathAttrTable */
  85 #define BGPPATHATTRPEER                       1
  86 #define BGPPATHATTRDESTNETWORK                2
  87 #define BGPPATHATTRORIGIN                     3
  88 #define BGPPATHATTRASPATH                     4
  89 #define BGPPATHATTRNEXTHOP                    5
  90 #define BGPPATHATTRINTERASMETRIC              6
  91
  92 /* BGP MIB bgp4PathAttrTable. */
  93 #define BGP4PATHATTRPEER                      1
  94 #define BGP4PATHATTRIPADDRPREFIXLEN           2
  95 #define BGP4PATHATTRIPADDRPREFIX              3
  96 #define BGP4PATHATTRORIGIN                    4
  97 #define BGP4PATHATTRASPATHSEGMENT             5
  98 #define BGP4PATHATTRNEXTHOP                   6
  99 #define BGP4PATHATTRMULTIEXITDISC             7
 100 #define BGP4PATHATTRLOCALPREF                 8
 101 #define BGP4PATHATTRATOMICAGGREGATE           9
 102 #define BGP4PATHATTRAGGREGATORAS             10
 103 #define BGP4PATHATTRAGGREGATORADDR           11
 104 #define BGP4PATHATTRCALCLOCALPREF            12
 105 #define BGP4PATHATTRBEST                     13
 106 #define BGP4PATHATTRUNKNOWN                  14
 107
 108 /* SNMP value hack. */
 109 #define INTEGER ASN_INTEGER
 110 #define INTEGER32 ASN_INTEGER
 111 #define COUNTER32 ASN_COUNTER
 112 #define OCTET_STRING ASN_OCTET_STR
 113 #define IPADDRESS ASN_IPADDRESS
 114 #define GAUGE32 ASN_UNSIGNED
 115
 116 /* Declare static local variables for convenience. */
 117 SNMP_LOCAL_VARIABLES
 118
 119 /* BGP-MIB instances. */
 120 static oid bgp_oid [] = { BGP4MIB };
 121 static oid bgp_trap_oid [] = { BGP4MIB, 0 };
 122
 123 /* IP address 0.0.0.0. */
 124 static struct in_addr bgp_empty_addr = { .s_addr = 0 };
 125
 126 /* Hook functions. */
 127 static u_char *bgpVersion (struct variable *, oid [], size_t *, int,
 128                            size_t *, WriteMethod **);
 129 static u_char *bgpLocalAs (struct variable *, oid [], size_t *,
 130                            int, size_t *, WriteMethod **);
 131 static u_char *bgpPeerTable (struct variable *, oid [], size_t *,
 132                              int, size_t *, WriteMethod **);
 133 static u_char *bgpRcvdPathAttrTable (struct variable *, oid [], size_t *,
 134                                      int, size_t *, WriteMethod **);
 135 static u_char *bgpIdentifier (struct variable *, oid [], size_t *,
 136                               int, size_t *, WriteMethod **);
 137 static u_char *bgp4PathAttrTable (struct variable *, oid [], size_t *,
 138                                   int, size_t *, WriteMethod **);
 139 /* static u_char *bgpTraps (); */
 140
 141 static struct variable bgp_variables[] =
 142 {
 143   /* BGP version. */
 144   {BGPVERSION,                OCTET_STRING, RONLY, bgpVersion,
 145    1, {1}},
 146   /* BGP local AS. */
 147   {BGPLOCALAS,                INTEGER, RONLY, bgpLocalAs,
 148    1, {2}},
 149   /* BGP peer table. */
 150   {BGPPEERIDENTIFIER,         IPADDRESS, RONLY, bgpPeerTable,
 151    3, {3, 1, 1}},
 152   {BGPPEERSTATE,              INTEGER, RONLY, bgpPeerTable,
 153    3, {3, 1, 2}},
 154   {BGPPEERADMINSTATUS,        INTEGER, RWRITE, bgpPeerTable,
 155    3, {3, 1, 3}},
 156   {BGPPEERNEGOTIATEDVERSION,  INTEGER32, RONLY, bgpPeerTable,
 157    3, {3, 1, 4}},
 158   {BGPPEERLOCALADDR,          IPADDRESS, RONLY, bgpPeerTable,
 159    3, {3, 1, 5}},
 160   {BGPPEERLOCALPORT,          INTEGER, RONLY, bgpPeerTable,
 161    3, {3, 1, 6}},
 162   {BGPPEERREMOTEADDR,         IPADDRESS, RONLY, bgpPeerTable,
 163    3, {3, 1, 7}},
 164   {BGPPEERREMOTEPORT,         INTEGER, RONLY, bgpPeerTable,
 165    3, {3, 1, 8}},
 166   {BGPPEERREMOTEAS,           INTEGER, RONLY, bgpPeerTable,
 167    3, {3, 1, 9}},
 168   {BGPPEERINUPDATES,          COUNTER32, RONLY, bgpPeerTable,
 169    3, {3, 1, 10}},
 170   {BGPPEEROUTUPDATES,         COUNTER32, RONLY, bgpPeerTable,
 171    3, {3, 1, 11}},
 172   {BGPPEERINTOTALMESSAGES,    COUNTER32, RONLY, bgpPeerTable,
 173    3, {3, 1, 12}},
 174   {BGPPEEROUTTOTALMESSAGES,   COUNTER32, RONLY, bgpPeerTable,
 175    3, {3, 1, 13}},
 176   {BGPPEERLASTERROR,          OCTET_STRING, RONLY, bgpPeerTable,
 177    3, {3, 1, 14}},
 178   {BGPPEERFSMESTABLISHEDTRANSITIONS, COUNTER32, RONLY, bgpPeerTable,
 179    3, {3, 1, 15}},
 180   {BGPPEERFSMESTABLISHEDTIME, GAUGE32, RONLY, bgpPeerTable,
 181    3, {3, 1, 16}},
 182   {BGPPEERCONNECTRETRYINTERVAL, INTEGER, RWRITE, bgpPeerTable,
 183    3, {3, 1, 17}},
 184   {BGPPEERHOLDTIME,           INTEGER, RONLY, bgpPeerTable,
 185    3, {3, 1, 18}},
 186   {BGPPEERKEEPALIVE,          INTEGER, RONLY, bgpPeerTable,
 187    3, {3, 1, 19}},
 188   {BGPPEERHOLDTIMECONFIGURED, INTEGER, RWRITE, bgpPeerTable,
 189    3, {3, 1, 20}},
 190   {BGPPEERKEEPALIVECONFIGURED, INTEGER, RWRITE, bgpPeerTable,
 191    3, {3, 1, 21}},
 192   {BGPPEERMINROUTEADVERTISEMENTINTERVAL, INTEGER, RWRITE, bgpPeerTable,
 193    3, {3, 1, 23}},
 194   {BGPPEERINUPDATEELAPSEDTIME, GAUGE32, RONLY, bgpPeerTable,
 195    3, {3, 1, 24}},
 196   /* BGP identifier. */
 197   {BGPIDENTIFIER,             IPADDRESS, RONLY, bgpIdentifier,
 198    1, {4}},
 199   /* BGP received path attribute table. */
 200   {BGPPATHATTRPEER,           IPADDRESS, RONLY, bgpRcvdPathAttrTable,
 201    3, {5, 1, 1}},
 202   {BGPPATHATTRDESTNETWORK,    IPADDRESS, RONLY, bgpRcvdPathAttrTable,
 203    3, {5, 1, 2}},
 204   {BGPPATHATTRORIGIN,         INTEGER, RONLY, bgpRcvdPathAttrTable,
 205    3, {5, 1, 3}},
 206   {BGPPATHATTRASPATH,         OCTET_STRING, RONLY, bgpRcvdPathAttrTable,
 207    3, {5, 1, 4}},
 208   {BGPPATHATTRNEXTHOP,        IPADDRESS, RONLY, bgpRcvdPathAttrTable,
 209    3, {5, 1, 5}},
 210   {BGPPATHATTRINTERASMETRIC,  INTEGER32, RONLY, bgpRcvdPathAttrTable,
 211    3, {5, 1, 6}},
 212   /* BGP-4 received path attribute table. */
 213   {BGP4PATHATTRPEER, IPADDRESS, RONLY, bgp4PathAttrTable,
 214    3, {6, 1, 1}},
 215   {BGP4PATHATTRIPADDRPREFIXLEN, INTEGER, RONLY, bgp4PathAttrTable,
 216    3, {6, 1, 2}},
 217   {BGP4PATHATTRIPADDRPREFIX,  IPADDRESS, RONLY, bgp4PathAttrTable,
 218    3, {6, 1, 3}},
 219   {BGP4PATHATTRORIGIN,        INTEGER, RONLY, bgp4PathAttrTable,
 220    3, {6, 1, 4}},
 221   {BGP4PATHATTRASPATHSEGMENT, OCTET_STRING, RONLY, bgp4PathAttrTable,
 222    3, {6, 1, 5}},
 223   {BGP4PATHATTRNEXTHOP,       IPADDRESS, RONLY, bgp4PathAttrTable,
 224    3, {6, 1, 6}},
 225   {BGP4PATHATTRMULTIEXITDISC, INTEGER, RONLY, bgp4PathAttrTable,
 226    3, {6, 1, 7}},
 227   {BGP4PATHATTRLOCALPREF,     INTEGER, RONLY, bgp4PathAttrTable,
 228    3, {6, 1, 8}},
 229   {BGP4PATHATTRATOMICAGGREGATE, INTEGER, RONLY, bgp4PathAttrTable,
 230    3, {6, 1, 9}},
 231   {BGP4PATHATTRAGGREGATORAS,  INTEGER, RONLY, bgp4PathAttrTable,
 232    3, {6, 1, 10}},
 233   {BGP4PATHATTRAGGREGATORADDR, IPADDRESS, RONLY, bgp4PathAttrTable,
 234    3, {6, 1, 11}},
 235   {BGP4PATHATTRCALCLOCALPREF, INTEGER, RONLY, bgp4PathAttrTable,
 236    3, {6, 1, 12}},
 237   {BGP4PATHATTRBEST,          INTEGER, RONLY, bgp4PathAttrTable,
 238    3, {6, 1, 13}},
 239   {BGP4PATHATTRUNKNOWN,       OCTET_STRING, RONLY, bgp4PathAttrTable,
 240    3, {6, 1, 14}},
 241 };
 242
 243
 244 static u_char *
 245 bgpVersion (struct variable *v, oid name[], size_t *length, int exact,
 246             size_t *var_len, WriteMethod **write_method)
 247 {
 248   static u_char version;
 249
 250   if (smux_header_generic(v, name, length, exact, var_len, write_method)
 251       == MATCH_FAILED)
 252     return NULL;
 253
 254   /* Retrun BGP version.  Zebra bgpd only support version 4. */
 255   version = (0x80 >> (BGP_VERSION_4 - 1));
 256
 257   /* Return octet string length 1. */
 258   *var_len = 1;
 259   return (u_char *)&version;
 260 }
 261
 262 static u_char *
 263 bgpLocalAs (struct variable *v, oid name[], size_t *length,
 264             int exact, size_t *var_len, WriteMethod **write_method)
 265 {
 266   struct bgp *bgp;
 267
 268   if (smux_header_generic(v, name, length, exact, var_len, write_method)
 269       == MATCH_FAILED)
 270     return NULL;
 271
 272   /* Get BGP structure. */
 273   bgp = bgp_get_default ();
 274   if (! bgp)
 275     return NULL;
 276
 277   return SNMP_INTEGER (bgp->as);
 278 }
 279
 280 static struct peer *
 281 peer_lookup_addr_ipv4 (struct in_addr *src)
 282 {
 283   struct bgp *bgp;
 284   struct peer *peer;
 285   struct listnode *node;
 286   struct in_addr addr;
 287   int ret;
 288
 289   bgp = bgp_get_default ();
 290   if (! bgp)
 291     return NULL;
 292
 293   for (ALL_LIST_ELEMENTS_RO (bgp->peer, node, peer))
 294     {
 295       ret = inet_pton (AF_INET, peer->host, &addr);
 296       if (ret > 0)
 297         {
 298           if (IPV4_ADDR_SAME (&addr, src))
 299             return peer;
 300         }
 301     }
 302   return NULL;
 303 }
 304
 305 static struct peer *
 306 bgp_peer_lookup_next (struct in_addr *src)
 307 {
 308   struct bgp *bgp;
 309   struct peer *peer;
 310   struct listnode *node;
 311   struct in_addr *p;
 312   union sockunion su;
 313   int ret;
 314
 315   sockunion_init (&su);
 316
 317   bgp = bgp_get_default ();
 318   if (! bgp)
 319     return NULL;
 320
 321   for (ALL_LIST_ELEMENTS_RO (bgp->peer, node, peer))
 322     {
 323       ret = inet_pton (AF_INET, peer->host, &su.sin.sin_addr);
 324       if (ret > 0)
 325         {
 326           p = &su.sin.sin_addr;
 327
 328           if (ntohl (p->s_addr) > ntohl (src->s_addr))
 329             {
 330               src->s_addr = p->s_addr;
 331               return peer;
 332             }
 333         }
 334     }
 335   return NULL;
 336 }
 337
 338 /* 1.3.6.1.2.1.15.3.1.x  = 10 */
 339 #define PEERTAB_NAMELEN 10
 340
 341 static struct peer *
 342 bgpPeerTable_lookup (struct variable *v, oid name[], size_t *length,
 343                      struct in_addr *addr, int exact)
 344 {
 345   struct peer *peer = NULL;
 346   size_t namelen = v ? v->namelen : PEERTAB_NAMELEN;
 347   int len;
 348
 349   if (exact)
 350     {
 351       /* Check the length. */
 352       if (*length - namelen != sizeof (struct in_addr))
 353         return NULL;
 354
 355       oid2in_addr (name + namelen, IN_ADDR_SIZE, addr);
 356
 357       peer = peer_lookup_addr_ipv4 (addr);
 358       return peer;
 359     }
 360   else
 361     {
 362       len = *length - namelen;
 363       if (len > 4) len = 4;
 364
 365       oid2in_addr (name + namelen, len, addr);
 366
 367       peer = bgp_peer_lookup_next (addr);
 368
 369       if (peer == NULL)
 370         return NULL;
 371
 372       oid_copy_addr (name + namelen, addr, sizeof (struct in_addr));
 373       *length = sizeof (struct in_addr) + namelen;
 374
 375       return peer;
 376     }
 377   return NULL;
 378 }
 379
 380 /* BGP write methods. */
 381 static int
 382 write_bgpPeerTable (int action, u_char *var_val,
 383                     u_char var_val_type, size_t var_val_len,
 384                     u_char *statP, oid *name, size_t length)
 385 {
 386   struct in_addr addr;
 387   struct peer *peer;
 388   long intval;
 389
 390   if (var_val_type != ASN_INTEGER)
 391     {
 392       return SNMP_ERR_WRONGTYPE;
 393     }
 394   if (var_val_len != sizeof (long))
 395     {
 396       return SNMP_ERR_WRONGLENGTH;
 397     }
 398
 399   intval = *(long *)var_val;
 400
 401   memset (&addr, 0, sizeof (struct in_addr));
 402
 403   peer = bgpPeerTable_lookup (NULL, name, &length, &addr, 1);
 404   if (! peer)
 405     return SNMP_ERR_NOSUCHNAME;
 406
 407   if (action != SNMP_MSG_INTERNAL_SET_COMMIT)
 408     return SNMP_ERR_NOERROR;
 409
 410   zlog_info ("%s: SNMP write .%ld = %ld",
 411              peer->host, (long)name[PEERTAB_NAMELEN - 1], intval);
 412
 413   switch (name[PEERTAB_NAMELEN - 1])
 414     {
 415     case BGPPEERADMINSTATUS:
 416 #define BGP_PeerAdmin_stop  1
 417 #define BGP_PeerAdmin_start 2
 418       /* When the peer is established,   */
 419       if (intval == BGP_PeerAdmin_stop)
 420         BGP_EVENT_ADD (peer, BGP_Stop);
 421       else if (intval == BGP_PeerAdmin_start)
 422         ;                       /* Do nothing. */
 423       else
 424         return SNMP_ERR_NOSUCHNAME;
 425       break;
 426     case BGPPEERCONNECTRETRYINTERVAL:
 427       SET_FLAG (peer->config, PEER_CONFIG_CONNECT);
 428       peer->connect = intval;
 429       peer->v_connect = intval;
 430       break;
 431     case BGPPEERHOLDTIMECONFIGURED:
 432       SET_FLAG (peer->config, PEER_CONFIG_TIMER);
 433       peer->holdtime = intval;
 434       peer->v_holdtime = intval;
 435       break;
 436     case BGPPEERKEEPALIVECONFIGURED:
 437       SET_FLAG (peer->config, PEER_CONFIG_TIMER);
 438       peer->keepalive = intval;
 439       peer->v_keepalive = intval;
 440       break;
 441     case BGPPEERMINROUTEADVERTISEMENTINTERVAL:
 442       peer->v_routeadv = intval;
 443       break;
 444     }
 445   return SNMP_ERR_NOERROR;
 446 }
 447
 448 static u_char *
 449 bgpPeerTable (struct variable *v, oid name[], size_t *length,
 450               int exact, size_t *var_len, WriteMethod **write_method)
 451 {
 452   static struct in_addr addr;
 453   struct peer *peer;
 454
 455   if (smux_header_table(v, name, length, exact, var_len, write_method)
 456       == MATCH_FAILED)
 457     return NULL;
 458   memset (&addr, 0, sizeof (struct in_addr));
 459
 460   peer = bgpPeerTable_lookup (v, name, length, &addr, exact);
 461   if (! peer)
 462     return NULL;
 463
 464   switch (v->magic)
 465     {
 466     case BGPPEERIDENTIFIER:
 467       return SNMP_IPADDRESS (peer->remote_id);
 468       break;
 469     case BGPPEERSTATE:
 470       return SNMP_INTEGER (peer->status);
 471       break;
 472     case BGPPEERADMINSTATUS:
 473       *write_method = write_bgpPeerTable;
 474 #define BGP_PeerAdmin_stop  1
 475 #define BGP_PeerAdmin_start 2
 476       if (CHECK_FLAG (peer->flags, PEER_FLAG_SHUTDOWN))
 477         return SNMP_INTEGER (BGP_PeerAdmin_stop);
 478       else
 479         return SNMP_INTEGER (BGP_PeerAdmin_start);
 480       break;
 481     case BGPPEERNEGOTIATEDVERSION:
 482       return SNMP_INTEGER (BGP_VERSION_4);
 483       break;
 484     case BGPPEERLOCALADDR:
 485       if (peer->su_local)
 486         return SNMP_IPADDRESS (peer->su_local->sin.sin_addr);
 487       else
 488         return SNMP_IPADDRESS (bgp_empty_addr);
 489       break;
 490     case BGPPEERLOCALPORT:
 491       if (peer->su_local)
 492         return SNMP_INTEGER (ntohs (peer->su_local->sin.sin_port));
 493       else
 494         return SNMP_INTEGER (0);
 495       break;
 496     case BGPPEERREMOTEADDR:
 497       if (peer->su_remote)
 498         return SNMP_IPADDRESS (peer->su_remote->sin.sin_addr);
 499       else
 500         return SNMP_IPADDRESS (bgp_empty_addr);
 501       break;
 502     case BGPPEERREMOTEPORT:
 503       if (peer->su_remote)
 504         return SNMP_INTEGER (ntohs (peer->su_remote->sin.sin_port));
 505       else
 506         return SNMP_INTEGER (0);
 507       break;
 508     case BGPPEERREMOTEAS:
 509       return SNMP_INTEGER (peer->as);
 510       break;
 511     case BGPPEERINUPDATES:
 512       return SNMP_INTEGER (peer->update_in);
 513       break;
 514     case BGPPEEROUTUPDATES:
 515       return SNMP_INTEGER (peer->update_out);
 516       break;
 517     case BGPPEERINTOTALMESSAGES:
 518       return SNMP_INTEGER (peer->open_in + peer->update_in
 519                            + peer->keepalive_in + peer->notify_in
 520                            + peer->refresh_in + peer->dynamic_cap_in);
 521       break;
 522     case BGPPEEROUTTOTALMESSAGES:
 523       return SNMP_INTEGER (peer->open_out + peer->update_out
 524                            + peer->keepalive_out + peer->notify_out
 525                            + peer->refresh_out + peer->dynamic_cap_out);
 526       break;
 527     case BGPPEERLASTERROR:
 528       {
 529         static u_char lasterror[2];
 530         lasterror[0] = peer->notify.code;
 531         lasterror[1] = peer->notify.subcode;
 532         *var_len = 2;
 533         return (u_char *)&lasterror;
 534       }
 535       break;
 536     case BGPPEERFSMESTABLISHEDTRANSITIONS:
 537       return SNMP_INTEGER (peer->established);
 538       break;
 539     case BGPPEERFSMESTABLISHEDTIME:
 540       if (peer->uptime == 0)
 541         return SNMP_INTEGER (0);
 542       else
 543         return SNMP_INTEGER (bgp_clock () - peer->uptime);
 544       break;
 545     case BGPPEERCONNECTRETRYINTERVAL:
 546       *write_method = write_bgpPeerTable;
 547       return SNMP_INTEGER (peer->v_connect);
 548       break;
 549     case BGPPEERHOLDTIME:
 550       return SNMP_INTEGER (peer->v_holdtime);
 551       break;
 552     case BGPPEERKEEPALIVE:
 553       return SNMP_INTEGER (peer->v_keepalive);
 554       break;
 555     case BGPPEERHOLDTIMECONFIGURED:
 556       *write_method = write_bgpPeerTable;
 557       if (CHECK_FLAG (peer->config, PEER_CONFIG_TIMER))
 558         return SNMP_INTEGER (peer->holdtime);
 559       else
 560         return SNMP_INTEGER (peer->v_holdtime);
 561       break;
 562     case BGPPEERKEEPALIVECONFIGURED:
 563       *write_method = write_bgpPeerTable;
 564       if (CHECK_FLAG (peer->config, PEER_CONFIG_TIMER))
 565         return SNMP_INTEGER (peer->keepalive);
 566       else
 567         return SNMP_INTEGER (peer->v_keepalive);
 568       break;
 569     case BGPPEERMINROUTEADVERTISEMENTINTERVAL:
 570       *write_method = write_bgpPeerTable;
 571       return SNMP_INTEGER (peer->v_routeadv);
 572       break;
 573     case BGPPEERINUPDATEELAPSEDTIME:
 574       if (peer->update_time == 0)
 575         return SNMP_INTEGER (0);
 576       else
 577         return SNMP_INTEGER (bgp_clock () - peer->update_time);
 578       break;
 579     default:
 580       return NULL;
 581       break;
 582     }
 583   return NULL;
 584 }
 585
 586 static u_char *
 587 bgpIdentifier (struct variable *v, oid name[], size_t *length,
 588                int exact, size_t *var_len, WriteMethod **write_method)
 589 {
 590   struct bgp *bgp;
 591
 592   if (smux_header_generic(v, name, length, exact, var_len, write_method)
 593       == MATCH_FAILED)
 594     return NULL;
 595
 596   bgp = bgp_get_default ();
 597   if (!bgp)
 598     return NULL;
 599
 600   return SNMP_IPADDRESS (bgp->router_id);
 601 }
 602
 603 static u_char *
 604 bgpRcvdPathAttrTable (struct variable *v, oid name[], size_t *length,
 605                       int exact, size_t *var_len, WriteMethod **write_method)
 606 {
 607   /* Received Path Attribute Table.  This table contains, one entry
 608      per path to a network, path attributes received from all peers
 609      running BGP version 3 or less.  This table is obsolete, having
 610      been replaced in functionality with the bgp4PathAttrTable.  */
 611   return NULL;
 612 }
 613
 614 static struct bgp_info *
 615 bgp4PathAttrLookup (struct variable *v, oid name[], size_t *length,
 616                     struct bgp *bgp, struct prefix_ipv4 *addr, int exact)
 617 {
 618   oid *offset;
 619   int offsetlen;
 620   struct bgp_info *binfo;
 621   struct bgp_info *min;
 622   struct bgp_node *rn;
 623   union sockunion su;
 624   unsigned int len;
 625   struct in_addr paddr;
 626
 627   sockunion_init (&su);
 628
 629 #define BGP_PATHATTR_ENTRY_OFFSET \
 630           (IN_ADDR_SIZE + 1 + IN_ADDR_SIZE)
 631
 632   if (exact)
 633     {
 634       if (*length - v->namelen != BGP_PATHATTR_ENTRY_OFFSET)
 635         return NULL;
 636
 637       /* Set OID offset for prefix. */
 638       offset = name + v->namelen;
 639       oid2in_addr (offset, IN_ADDR_SIZE, &addr->prefix);
 640       offset += IN_ADDR_SIZE;
 641
 642       /* Prefix length. */
 643       addr->prefixlen = *offset;
 644       offset++;
 645
 646       /* Peer address. */
 647       su.sin.sin_family = AF_INET;
 648       oid2in_addr (offset, IN_ADDR_SIZE, &su.sin.sin_addr);
 649
 650       /* Lookup node. */
 651       rn = bgp_node_lookup (bgp->rib[AFI_IP][SAFI_UNICAST],
 652                               (struct prefix *) addr);
 653       if (rn)
 654         {
 655           bgp_unlock_node (rn);
 656
 657           for (binfo = rn->info; binfo; binfo = binfo->next)
 658             if (sockunion_same (&binfo->peer->su, &su))
 659               return binfo;
 660         }
 661     }
 662   else
 663     {
 664       offset = name + v->namelen;
 665       offsetlen = *length - v->namelen;
 666       len = offsetlen;
 667
 668       if (offsetlen == 0)
 669         rn = bgp_table_top (bgp->rib[AFI_IP][SAFI_UNICAST]);
 670       else
 671         {
 672           if (len > IN_ADDR_SIZE)
 673             len = IN_ADDR_SIZE;
 674
 675           oid2in_addr (offset, len, &addr->prefix);
 676
 677           offset += IN_ADDR_SIZE;
 678           offsetlen -= IN_ADDR_SIZE;
 679
 680           if (offsetlen > 0)
 681             addr->prefixlen = *offset;
 682           else
 683             addr->prefixlen = len * 8;
 684
 685           rn = bgp_node_get (bgp->rib[AFI_IP][SAFI_UNICAST],
 686                                (struct prefix *) addr);
 687
 688           offset++;
 689           offsetlen--;
 690         }
 691
 692       if (offsetlen > 0)
 693         {
 694           len = offsetlen;
 695           if (len > IN_ADDR_SIZE)
 696             len = IN_ADDR_SIZE;
 697
 698           oid2in_addr (offset, len, &paddr);
 699         }
 700       else
 701         paddr.s_addr = 0;
 702
 703       if (! rn)
 704         return NULL;
 705
 706       do
 707         {
 708           min = NULL;
 709
 710           for (binfo = rn->info; binfo; binfo = binfo->next)
 711             {
 712               if (binfo->peer->su.sin.sin_family == AF_INET
 713                   && ntohl (paddr.s_addr)
 714                   < ntohl (binfo->peer->su.sin.sin_addr.s_addr))
 715                 {
 716                   if (min)
 717                     {
 718                       if (ntohl (binfo->peer->su.sin.sin_addr.s_addr)
 719                           < ntohl (min->peer->su.sin.sin_addr.s_addr))
 720                         min = binfo;
 721                     }
 722                   else
 723                     min = binfo;
 724                 }
 725             }
 726
 727           if (min)
 728             {
 729               *length = v->namelen + BGP_PATHATTR_ENTRY_OFFSET;
 730
 731               offset = name + v->namelen;
 732               oid_copy_addr (offset, &rn->p.u.prefix4, IN_ADDR_SIZE);
 733               offset += IN_ADDR_SIZE;
 734               *offset = rn->p.prefixlen;
 735               offset++;
 736               oid_copy_addr (offset, &min->peer->su.sin.sin_addr,
 737                              IN_ADDR_SIZE);
 738               addr->prefix = rn->p.u.prefix4;
 739               addr->prefixlen = rn->p.prefixlen;
 740
 741               bgp_unlock_node (rn);
 742
 743               return min;
 744             }
 745
 746           paddr.s_addr = 0;
 747         }
 748       while ((rn = bgp_route_next (rn)) != NULL);
 749     }
 750   return NULL;
 751 }
 752
 753 static u_char *
 754 bgp4PathAttrTable (struct variable *v, oid name[], size_t *length,
 755                    int exact, size_t *var_len, WriteMethod **write_method)
 756 {
 757   struct bgp *bgp;
 758   struct bgp_info *binfo;
 759   struct prefix_ipv4 addr;
 760
 761   bgp = bgp_get_default ();
 762   if (! bgp)
 763     return NULL;
 764
 765   if (smux_header_table(v, name, length, exact, var_len, write_method)
 766       == MATCH_FAILED)
 767     return NULL;
 768   memset (&addr, 0, sizeof (struct prefix_ipv4));
 769
 770   binfo = bgp4PathAttrLookup (v, name, length, bgp, &addr, exact);
 771   if (! binfo)
 772     return NULL;
 773
 774   switch (v->magic)
 775     {
 776     case BGP4PATHATTRPEER:      /* 1 */
 777       return SNMP_IPADDRESS (binfo->peer->su.sin.sin_addr);
 778       break;
 779     case BGP4PATHATTRIPADDRPREFIXLEN: /* 2 */
 780       return SNMP_INTEGER (addr.prefixlen);
 781       break;
 782     case BGP4PATHATTRIPADDRPREFIX: /* 3 */
 783       return SNMP_IPADDRESS (addr.prefix);
 784       break;
 785     case BGP4PATHATTRORIGIN:    /* 4 */
 786       return SNMP_INTEGER (binfo->attr->origin);
 787       break;
 788     case BGP4PATHATTRASPATHSEGMENT: /* 5 */
 789       return aspath_snmp_pathseg (binfo->attr->aspath, var_len);
 790       break;
 791     case BGP4PATHATTRNEXTHOP:   /* 6 */
 792       return SNMP_IPADDRESS (binfo->attr->nexthop);
 793       break;
 794     case BGP4PATHATTRMULTIEXITDISC: /* 7 */
 795       return SNMP_INTEGER (binfo->attr->med);
 796       break;
 797     case BGP4PATHATTRLOCALPREF: /* 8 */
 798       return SNMP_INTEGER (binfo->attr->local_pref);
 799       break;
 800     case BGP4PATHATTRATOMICAGGREGATE: /* 9 */
 801       return SNMP_INTEGER (1);
 802       break;
 803     case BGP4PATHATTRAGGREGATORAS: /* 10 */
 804       if (binfo->attr->extra)
 805         return SNMP_INTEGER (binfo->attr->extra->aggregator_as);
 806       else
 807         return SNMP_INTEGER (0);
 808       break;
 809     case BGP4PATHATTRAGGREGATORADDR: /* 11 */
 810       if (binfo->attr->extra)
 811         return SNMP_IPADDRESS (binfo->attr->extra->aggregator_addr);
 812       else
 813         return SNMP_INTEGER (0);
 814       break;
 815     case BGP4PATHATTRCALCLOCALPREF: /* 12 */
 816       return SNMP_INTEGER (-1);
 817       break;
 818     case BGP4PATHATTRBEST:      /* 13 */
 819 #define BGP4_PathAttrBest_false 1
 820 #define BGP4_PathAttrBest_true  2
 821       if (CHECK_FLAG (binfo->flags, BGP_INFO_SELECTED))
 822         return SNMP_INTEGER (BGP4_PathAttrBest_true);
 823       else
 824         return SNMP_INTEGER (BGP4_PathAttrBest_false);
 825       break;
 826     case BGP4PATHATTRUNKNOWN:   /* 14 */
 827       *var_len = 0;
 828       return NULL;
 829       break;
 830     }
 831   return NULL;
 832 }
 833
 834 /* BGP Traps. */
 835 static struct trap_object bgpTrapList[] =
 836 {
 837   {3, {3, 1, BGPPEERLASTERROR}},
 838   {3, {3, 1, BGPPEERSTATE}}
 839 };
 840
 841 void
 842 bgpTrapEstablished (struct peer *peer)
 843 {
 844   int ret;
 845   struct in_addr addr;
 846   oid index[sizeof (oid) * IN_ADDR_SIZE];
 847
 848   ret = inet_aton (peer->host, &addr);
 849   if (ret == 0)
 850     return;
 851
 852   oid_copy_addr (index, &addr, IN_ADDR_SIZE);
 853
 854   smux_trap (bgp_variables, sizeof bgp_variables / sizeof (struct variable),
 855              bgp_trap_oid, sizeof bgp_trap_oid / sizeof (oid),
 856              bgp_oid, sizeof bgp_oid / sizeof (oid),
 857              index, IN_ADDR_SIZE,
 858              bgpTrapList, sizeof bgpTrapList / sizeof (struct trap_object),
 859              BGPESTABLISHED);
 860 }
 861
 862 void
 863 bgpTrapBackwardTransition (struct peer *peer)
 864 {
 865   int ret;
 866   struct in_addr addr;
 867   oid index[sizeof (oid) * IN_ADDR_SIZE];
 868
 869   ret = inet_aton (peer->host, &addr);
 870   if (ret == 0)
 871     return;
 872
 873   oid_copy_addr (index, &addr, IN_ADDR_SIZE);
 874
 875   smux_trap (bgp_variables, sizeof bgp_variables / sizeof (struct variable),
 876              bgp_trap_oid, sizeof bgp_trap_oid / sizeof (oid),
 877              bgp_oid, sizeof bgp_oid / sizeof (oid),
 878              index, IN_ADDR_SIZE,
 879              bgpTrapList, sizeof bgpTrapList / sizeof (struct trap_object),
 880              BGPBACKWARDTRANSITION);
 881 }
 882
 883 void
 884 bgp_snmp_init (void)
 885 {
 886   smux_init (bm->master);
 887   REGISTER_MIB("mibII/bgp", bgp_variables, variable, bgp_oid);
 888 }
 889 #endif /* HAVE_SNMP */