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