release/src/router/zebra/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
  25 #ifdef HAVE_NETSNMP
  26 #include <net-snmp/net-snmp-config.h>
  27 #endif /* HAVE_NETSNMP */
  28
  29 #include <asn1.h>
  30 #include <snmp.h>
  31 #include <snmp_impl.h>
  32
  33 #include "if.h"
  34 #include "log.h"
  35 #include "prefix.h"
  36 #include "command.h"
  37 #include "thread.h"
  38 #include "smux.h"
  39
  40 #include "bgpd/bgpd.h"
  41 #include "bgpd/bgp_table.h"
  42 #include "bgpd/bgp_aspath.h"
  43 #include "bgpd/bgp_attr.h"
  44 #include "bgpd/bgp_route.h"
  45 #include "bgpd/bgp_fsm.h"
  46 \f
  47 /* BGP4-MIB described in RFC1657. */
  48 #define BGP4MIB 1,3,6,1,2,1,15
  49
  50 /* BGP TRAP. */
  51 #define BGPESTABLISHED                  1
  52 #define BGPBACKWARDTRANSITION           2
  53
  54 /* Zebra enterprise BGP MIB.  This variable is used for register
  55    OSPF MIB to SNMP agent under SMUX protocol.  */
  56 #define BGPDMIB 1,3,6,1,4,1,3317,1,2,2
  57
  58 /* BGP MIB bgpVersion. */
  59 #define BGPVERSION                            0
  60
  61 /* BGP MIB bgpLocalAs. */
  62 #define BGPLOCALAS                            0
  63
  64 /* BGP MIB bgpPeerTable. */
  65 #define BGPPEERIDENTIFIER                     1
  66 #define BGPPEERSTATE                          2
  67 #define BGPPEERADMINSTATUS                    3
  68 #define BGPPEERNEGOTIATEDVERSION              4
  69 #define BGPPEERLOCALADDR                      5
  70 #define BGPPEERLOCALPORT                      6
  71 #define BGPPEERREMOTEADDR                     7
  72 #define BGPPEERREMOTEPORT                     8
  73 #define BGPPEERREMOTEAS                       9
  74 #define BGPPEERINUPDATES                     10
  75 #define BGPPEEROUTUPDATES                    11
  76 #define BGPPEERINTOTALMESSAGES               12
  77 #define BGPPEEROUTTOTALMESSAGES              13
  78 #define BGPPEERLASTERROR                     14
  79 #define BGPPEERFSMESTABLISHEDTRANSITIONS     15
  80 #define BGPPEERFSMESTABLISHEDTIME            16
  81 #define BGPPEERCONNECTRETRYINTERVAL          17
  82 #define BGPPEERHOLDTIME                      18
  83 #define BGPPEERKEEPALIVE                     19
  84 #define BGPPEERHOLDTIMECONFIGURED            20
  85 #define BGPPEERKEEPALIVECONFIGURED           21
  86 #define BGPPEERMINASORIGINATIONINTERVAL      22
  87 #define BGPPEERMINROUTEADVERTISEMENTINTERVAL 23
  88 #define BGPPEERINUPDATEELAPSEDTIME           24
  89
  90 /* BGP MIB bgpIdentifier. */
  91 #define BGPIDENTIFIER                         0
  92
  93 /* BGP MIB bgpRcvdPathAttrTable */
  94 #define BGPPATHATTRPEER                       1
  95 #define BGPPATHATTRDESTNETWORK                2
  96 #define BGPPATHATTRORIGIN                     3
  97 #define BGPPATHATTRASPATH                     4
  98 #define BGPPATHATTRNEXTHOP                    5
  99 #define BGPPATHATTRINTERASMETRIC              6
 100
 101 /* BGP MIB bgp4PathAttrTable. */
 102 #define BGP4PATHATTRPEER                      1
 103 #define BGP4PATHATTRIPADDRPREFIXLEN           2
 104 #define BGP4PATHATTRIPADDRPREFIX              3
 105 #define BGP4PATHATTRORIGIN                    4
 106 #define BGP4PATHATTRASPATHSEGMENT             5
 107 #define BGP4PATHATTRNEXTHOP                   6
 108 #define BGP4PATHATTRMULTIEXITDISC             7
 109 #define BGP4PATHATTRLOCALPREF                 8
 110 #define BGP4PATHATTRATOMICAGGREGATE           9
 111 #define BGP4PATHATTRAGGREGATORAS             10
 112 #define BGP4PATHATTRAGGREGATORADDR           11
 113 #define BGP4PATHATTRCALCLOCALPREF            12
 114 #define BGP4PATHATTRBEST                     13
 115 #define BGP4PATHATTRUNKNOWN                  14
 116
 117 /* SNMP value hack. */
 118 #define INTEGER ASN_INTEGER
 119 #define INTEGER32 ASN_INTEGER
 120 #define COUNTER32 ASN_COUNTER
 121 #define OCTET_STRING ASN_OCTET_STR
 122 #define IPADDRESS ASN_IPADDRESS
 123 #define GAUGE32 ASN_UNSIGNED
 124 \f
 125 /* Declare static local variables for convenience. */
 126 SNMP_LOCAL_VARIABLES
 127
 128 /* BGP-MIB instances. */
 129 oid bgp_oid [] = { BGP4MIB };
 130 oid bgpd_oid [] = { BGPDMIB };
 131
 132 /* IP address 0.0.0.0. */
 133 static struct in_addr bgp_empty_addr = {0};
 134
 135 /* Hook functions. */
 136 static u_char *bgpVersion ();
 137 static u_char *bgpLocalAs ();
 138 static u_char *bgpPeerTable ();
 139 static u_char *bgpRcvdPathAttrTable ();
 140 static u_char *bgpIdentifier ();
 141 static u_char *bgp4PathAttrTable ();
 142 /* static u_char *bgpTraps (); */
 143
 144 struct variable bgp_variables[] =
 145 {
 146   /* BGP version. */
 147   {BGPVERSION,                OCTET_STRING, RONLY, bgpVersion,
 148    1, {1}},
 149   /* BGP local AS. */
 150   {BGPLOCALAS,                INTEGER, RONLY, bgpLocalAs,
 151    1, {2}},
 152   /* BGP peer table. */
 153   {BGPPEERIDENTIFIER,         IPADDRESS, RONLY, bgpPeerTable,
 154    3, {3, 1, 1}},
 155   {BGPPEERSTATE,              INTEGER, RONLY, bgpPeerTable,
 156    3, {3, 1, 2}},
 157   {BGPPEERADMINSTATUS,        INTEGER, RWRITE, bgpPeerTable,
 158    3, {3, 1, 3}},
 159   {BGPPEERNEGOTIATEDVERSION,  INTEGER32, RONLY, bgpPeerTable,
 160    3, {3, 1, 4}},
 161   {BGPPEERLOCALADDR,          IPADDRESS, RONLY, bgpPeerTable,
 162    3, {3, 1, 5}},
 163   {BGPPEERLOCALPORT,          INTEGER, RONLY, bgpPeerTable,
 164    3, {3, 1, 6}},
 165   {BGPPEERREMOTEADDR,         IPADDRESS, RONLY, bgpPeerTable,
 166    3, {3, 1, 7}},
 167   {BGPPEERREMOTEPORT,         INTEGER, RONLY, bgpPeerTable,
 168    3, {3, 1, 8}},
 169   {BGPPEERREMOTEAS,           INTEGER, RONLY, bgpPeerTable,
 170    3, {3, 1, 9}},
 171   {BGPPEERINUPDATES,          COUNTER32, RONLY, bgpPeerTable,
 172    3, {3, 1, 10}},
 173   {BGPPEEROUTUPDATES,         COUNTER32, RONLY, bgpPeerTable,
 174    3, {3, 1, 11}},
 175   {BGPPEERINTOTALMESSAGES,    COUNTER32, RONLY, bgpPeerTable,
 176    3, {3, 1, 12}},
 177   {BGPPEEROUTTOTALMESSAGES,   COUNTER32, RONLY, bgpPeerTable,
 178    3, {3, 1, 13}},
 179   {BGPPEERLASTERROR,          OCTET_STRING, RONLY, bgpPeerTable,
 180    3, {3, 1, 14}},
 181   {BGPPEERFSMESTABLISHEDTRANSITIONS, COUNTER32, RONLY, bgpPeerTable,
 182    3, {3, 1, 15}},
 183   {BGPPEERFSMESTABLISHEDTIME, GAUGE32, RONLY, bgpPeerTable,
 184    3, {3, 1, 16}},
 185   {BGPPEERCONNECTRETRYINTERVAL, INTEGER, RWRITE, bgpPeerTable,
 186    3, {3, 1, 17}},
 187   {BGPPEERHOLDTIME,           INTEGER, RONLY, bgpPeerTable,
 188    3, {3, 1, 18}},
 189   {BGPPEERKEEPALIVE,          INTEGER, RONLY, bgpPeerTable,
 190    3, {3, 1, 19}},
 191   {BGPPEERHOLDTIMECONFIGURED, INTEGER, RWRITE, bgpPeerTable,
 192    3, {3, 1, 20}},
 193   {BGPPEERKEEPALIVECONFIGURED, INTEGER, RWRITE, bgpPeerTable,
 194    3, {3, 1, 21}},
 195   {BGPPEERMINASORIGINATIONINTERVAL, INTEGER, RWRITE, bgpPeerTable,
 196    3, {3, 1, 22}},
 197   {BGPPEERMINROUTEADVERTISEMENTINTERVAL, INTEGER, RWRITE, bgpPeerTable,
 198    3, {3, 1, 23}},
 199   {BGPPEERINUPDATEELAPSEDTIME, GAUGE32, RONLY, bgpPeerTable,
 200    3, {3, 1, 24}},
 201   /* BGP identifier. */
 202   {BGPIDENTIFIER,             IPADDRESS, RONLY, bgpIdentifier,
 203    1, {4}},
 204   /* BGP received path attribute table. */
 205   {BGPPATHATTRPEER,           IPADDRESS, RONLY, bgpRcvdPathAttrTable,
 206    3, {5, 1, 1}},
 207   {BGPPATHATTRDESTNETWORK,    IPADDRESS, RONLY, bgpRcvdPathAttrTable,
 208    3, {5, 1, 2}},
 209   {BGPPATHATTRORIGIN,         INTEGER, RONLY, bgpRcvdPathAttrTable,
 210    3, {5, 1, 3}},
 211   {BGPPATHATTRASPATH,         OCTET_STRING, RONLY, bgpRcvdPathAttrTable,
 212    3, {5, 1, 4}},
 213   {BGPPATHATTRNEXTHOP,        IPADDRESS, RONLY, bgpRcvdPathAttrTable,
 214    3, {5, 1, 5}},
 215   {BGPPATHATTRINTERASMETRIC,  INTEGER32, RONLY, bgpRcvdPathAttrTable,
 216    3, {5, 1, 6}},
 217   /* BGP-4 received path attribute table. */
 218   {BGP4PATHATTRPEER, IPADDRESS, RONLY, bgp4PathAttrTable,
 219    3, {6, 1, 1}},
 220   {BGP4PATHATTRIPADDRPREFIXLEN, INTEGER, RONLY, bgp4PathAttrTable,
 221    3, {6, 1, 2}},
 222   {BGP4PATHATTRIPADDRPREFIX,  IPADDRESS, RONLY, bgp4PathAttrTable,
 223    3, {6, 1, 3}},
 224   {BGP4PATHATTRORIGIN,        INTEGER, RONLY, bgp4PathAttrTable,
 225    3, {6, 1, 4}},
 226   {BGP4PATHATTRASPATHSEGMENT, OCTET_STRING, RONLY, bgp4PathAttrTable,
 227    3, {6, 1, 5}},
 228   {BGP4PATHATTRNEXTHOP,       IPADDRESS, RONLY, bgp4PathAttrTable,
 229    3, {6, 1, 6}},
 230   {BGP4PATHATTRMULTIEXITDISC, INTEGER, RONLY, bgp4PathAttrTable,
 231    3, {6, 1, 7}},
 232   {BGP4PATHATTRLOCALPREF,     INTEGER, RONLY, bgp4PathAttrTable,
 233    3, {6, 1, 8}},
 234   {BGP4PATHATTRATOMICAGGREGATE, INTEGER, RONLY, bgp4PathAttrTable,
 235    3, {6, 1, 9}},
 236   {BGP4PATHATTRAGGREGATORAS,  INTEGER, RONLY, bgp4PathAttrTable,
 237    3, {6, 1, 10}},
 238   {BGP4PATHATTRAGGREGATORADDR, IPADDRESS, RONLY, bgp4PathAttrTable,
 239    3, {6, 1, 11}},
 240   {BGP4PATHATTRCALCLOCALPREF, INTEGER, RONLY, bgp4PathAttrTable,
 241    3, {6, 1, 12}},
 242   {BGP4PATHATTRBEST,          INTEGER, RONLY, bgp4PathAttrTable,
 243    3, {6, 1, 13}},
 244   {BGP4PATHATTRUNKNOWN,       OCTET_STRING, RONLY, bgp4PathAttrTable,
 245    3, {6, 1, 14}},
 246 };
 247 \f
 248 static u_char *
 249 bgpVersion (struct variable *v, oid name[], size_t *length, int exact,
 250             size_t *var_len, WriteMethod **write_method)
 251 {
 252   static u_char version;
 253
 254   if (smux_header_generic(v, name, length, exact, var_len, write_method)
 255       == MATCH_FAILED)
 256     return NULL;
 257
 258   /* Retrun BGP version.  Zebra bgpd only support version 4. */
 259   version = (0x80 >> (BGP_VERSION_4 - 1));
 260
 261   /* Return octet string length 1. */
 262   *var_len = 1;
 263   return (u_char *)&version;
 264 }
 265
 266 static u_char *
 267 bgpLocalAs (struct variable *v, oid name[], size_t *length,
 268             int exact, size_t *var_len, WriteMethod **write_method)
 269 {
 270   struct bgp *bgp;
 271
 272   if (smux_header_generic(v, name, length, exact, var_len, write_method)
 273       == MATCH_FAILED)
 274     return NULL;
 275
 276   /* Get BGP structure. */
 277   bgp = bgp_get_default ();
 278   if (! bgp)
 279     return NULL;
 280
 281   return SNMP_INTEGER (bgp->as);
 282 }
 283
 284 struct peer *
 285 peer_lookup_addr_ipv4 (struct in_addr *src)
 286 {
 287   struct bgp *bgp;
 288   struct peer *peer;
 289   struct listnode *nn;
 290   struct in_addr addr;
 291   int ret;
 292
 293   bgp = bgp_get_default ();
 294   if (! bgp)
 295     return NULL;
 296
 297   LIST_LOOP (bgp->peer, peer, nn)
 298     {
 299       ret = inet_pton (AF_INET, peer->host, &addr);
 300       if (ret > 0)
 301         {
 302           if (IPV4_ADDR_SAME (&addr, src))
 303             return peer;
 304         }
 305     }
 306   return NULL;
 307 }
 308
 309 struct peer *
 310 bgp_peer_lookup_next (struct in_addr *src)
 311 {
 312   struct bgp *bgp;
 313   struct peer *peer;
 314   struct listnode *nn;
 315   struct in_addr *p;
 316   union sockunion su;
 317   int ret;
 318
 319   memset (&su, 0, sizeof (union sockunion));
 320
 321   bgp = bgp_get_default ();
 322   if (! bgp)
 323     return NULL;
 324
 325   LIST_LOOP (bgp->peer, peer, nn)
 326     {
 327       ret = inet_pton (AF_INET, peer->host, &su.sin.sin_addr);
 328       if (ret > 0)
 329         {
 330           p = &su.sin.sin_addr;
 331
 332           if (ntohl (p->s_addr) > ntohl (src->s_addr))
 333             {
 334               src->s_addr = p->s_addr;
 335               return peer;
 336             }
 337         }
 338     }
 339   return NULL;
 340 }
 341
 342 struct peer *
 343 bgpPeerTable_lookup (struct variable *v, oid name[], size_t *length,
 344                      struct in_addr *addr, int exact)
 345 {
 346   struct peer *peer = NULL;
 347   int len;
 348
 349   if (exact)
 350     {
 351       /* Check the length. */
 352       if (*length - v->namelen != sizeof (struct in_addr))
 353         return NULL;
 354
 355       oid2in_addr (name + v->namelen, IN_ADDR_SIZE, addr);
 356
 357       peer = peer_lookup_addr_ipv4 (addr);
 358       return peer;
 359     }
 360   else
 361     {
 362       len = *length - v->namelen;
 363       if (len > 4) len = 4;
 364
 365       oid2in_addr (name + v->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 + v->namelen, addr, sizeof (struct in_addr));
 373       *length = sizeof (struct in_addr) + v->namelen;
 374
 375       return peer;
 376     }
 377   return NULL;
 378 }
 379
 380 /* BGP write methods. */
 381 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                     struct variable *v)
 386 {
 387   struct in_addr addr;
 388   struct peer *peer;
 389   long intval;
 390   int bigsize = SNMP_MAX_LEN;
 391
 392   if (var_val_type != ASN_INTEGER)
 393     {
 394       return SNMP_ERR_WRONGTYPE;
 395     }
 396   if (var_val_len != sizeof (long))
 397     {
 398       return SNMP_ERR_WRONGLENGTH;
 399     }
 400
 401   if (! asn_parse_int(var_val, &bigsize, &var_val_type,
 402                       &intval, sizeof(long)))
 403     {
 404       return SNMP_ERR_WRONGENCODING;
 405     }
 406
 407   memset (&addr, 0, sizeof (struct in_addr));
 408
 409   peer = bgpPeerTable_lookup (v, name, &length, &addr, 1);
 410   if (! peer)
 411     return SNMP_ERR_NOSUCHNAME;
 412
 413   printf ("val: %ld\n", intval);
 414
 415   switch (v->magic)
 416     {
 417     case BGPPEERADMINSTATUS:
 418 #define BGP_PeerAdmin_stop  1
 419 #define BGP_PeerAdmin_start 2
 420       /* When the peer is established,   */
 421       if (intval == BGP_PeerAdmin_stop)
 422         BGP_EVENT_ADD (peer, BGP_Stop);
 423       else if (intval == BGP_PeerAdmin_start)
 424         ;                       /* Do nothing. */
 425       else
 426         return SNMP_ERR_NOSUCHNAME;
 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 BGPPEERMINASORIGINATIONINTERVAL:
 439       peer->v_asorig = intval;
 440       break;
 441     case BGPPEERMINROUTEADVERTISEMENTINTERVAL:
 442       peer->v_routeadv = intval;
 443       break;
 444     }
 445   return SNMP_ERR_NOERROR;
 446 }
 447
 448 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   *write_method = NULL;
 456   memset (&addr, 0, sizeof (struct in_addr));
 457
 458   peer = bgpPeerTable_lookup (v, name, length, &addr, exact);
 459   if (! peer)
 460     return NULL;
 461
 462   switch (v->magic)
 463     {
 464     case BGPPEERIDENTIFIER:
 465       return SNMP_IPADDRESS (peer->remote_id);
 466       break;
 467     case BGPPEERSTATE:
 468       return SNMP_INTEGER (peer->status);
 469       break;
 470     case BGPPEERADMINSTATUS:
 471       *write_method = write_bgpPeerTable;
 472 #define BGP_PeerAdmin_stop  1
 473 #define BGP_PeerAdmin_start 2
 474       if (CHECK_FLAG (peer->flags, PEER_FLAG_SHUTDOWN))
 475         return SNMP_INTEGER (BGP_PeerAdmin_stop);
 476       else
 477         return SNMP_INTEGER (BGP_PeerAdmin_start);
 478       break;
 479     case BGPPEERNEGOTIATEDVERSION:
 480       return SNMP_INTEGER (BGP_VERSION_4);
 481       break;
 482     case BGPPEERLOCALADDR:
 483       if (peer->su_local)
 484         return SNMP_IPADDRESS (peer->su_local->sin.sin_addr);
 485       else
 486         return SNMP_IPADDRESS (bgp_empty_addr);
 487       break;
 488     case BGPPEERLOCALPORT:
 489       if (peer->su_local)
 490         return SNMP_INTEGER (ntohs (peer->su_local->sin.sin_port));
 491       else
 492         return SNMP_INTEGER (0);
 493       break;
 494     case BGPPEERREMOTEADDR:
 495       if (peer->su_remote)
 496         return SNMP_IPADDRESS (peer->su_remote->sin.sin_addr);
 497       else
 498         return SNMP_IPADDRESS (bgp_empty_addr);
 499       break;
 500     case BGPPEERREMOTEPORT:
 501       if (peer->su_remote)
 502         return SNMP_INTEGER (ntohs (peer->su_remote->sin.sin_port));
 503       else
 504         return SNMP_INTEGER (0);
 505       break;
 506     case BGPPEERREMOTEAS:
 507       return SNMP_INTEGER (peer->as);
 508       break;
 509     case BGPPEERINUPDATES:
 510       return SNMP_INTEGER (peer->update_in);
 511       break;
 512     case BGPPEEROUTUPDATES:
 513       return SNMP_INTEGER (peer->update_out);
 514       break;
 515     case BGPPEERINTOTALMESSAGES:
 516       return SNMP_INTEGER (peer->open_in + peer->update_in
 517                            + peer->keepalive_in + peer->notify_in
 518                            + peer->refresh_in + peer->dynamic_cap_in);
 519       break;
 520     case BGPPEEROUTTOTALMESSAGES:
 521       return SNMP_INTEGER (peer->open_out + peer->update_out
 522                            + peer->keepalive_out + peer->notify_out
 523                            + peer->refresh_out + peer->dynamic_cap_out);
 524       break;
 525     case BGPPEERLASTERROR:
 526       {
 527         static u_char lasterror[2];
 528         lasterror[0] = peer->notify.code;
 529         lasterror[1] = peer->notify.subcode;
 530         *var_len = 2;
 531         return (u_char *)&lasterror;
 532       }
 533       break;
 534     case BGPPEERFSMESTABLISHEDTRANSITIONS:
 535       return SNMP_INTEGER (peer->established);
 536       break;
 537     case BGPPEERFSMESTABLISHEDTIME:
 538       if (peer->uptime == 0)
 539         return SNMP_INTEGER (0);
 540       else
 541         return SNMP_INTEGER (time (NULL) - peer->uptime);
 542       break;
 543     case BGPPEERCONNECTRETRYINTERVAL:
 544       *write_method = write_bgpPeerTable;
 545       return SNMP_INTEGER (peer->v_connect);
 546       break;
 547     case BGPPEERHOLDTIME:
 548       return SNMP_INTEGER (peer->v_holdtime);
 549       break;
 550     case BGPPEERKEEPALIVE:
 551       return SNMP_INTEGER (peer->v_keepalive);
 552       break;
 553     case BGPPEERHOLDTIMECONFIGURED:
 554       *write_method = write_bgpPeerTable;
 555       if (CHECK_FLAG (peer->config, PEER_CONFIG_TIMER))
 556         return SNMP_INTEGER (peer->holdtime);
 557       else
 558         return SNMP_INTEGER (peer->v_holdtime);
 559       break;
 560     case BGPPEERKEEPALIVECONFIGURED:
 561       *write_method = write_bgpPeerTable;
 562       if (CHECK_FLAG (peer->config, PEER_CONFIG_TIMER))
 563         return SNMP_INTEGER (peer->keepalive);
 564       else
 565         return SNMP_INTEGER (peer->v_keepalive);
 566       break;
 567     case BGPPEERMINASORIGINATIONINTERVAL:
 568       *write_method = write_bgpPeerTable;
 569       return SNMP_INTEGER (peer->v_asorig);
 570       break;
 571     case BGPPEERMINROUTEADVERTISEMENTINTERVAL:
 572       *write_method = write_bgpPeerTable;
 573       return SNMP_INTEGER (peer->v_routeadv);
 574       break;
 575     case BGPPEERINUPDATEELAPSEDTIME:
 576       if (peer->update_time == 0)
 577         return SNMP_INTEGER (0);
 578       else
 579         return SNMP_INTEGER (time (NULL) - peer->update_time);
 580       break;
 581     default:
 582       return NULL;
 583       break;
 584     }
 585   return NULL;
 586 }
 587
 588 u_char *
 589 bgpIdentifier (struct variable *v, oid name[], size_t *length,
 590                int exact, size_t *var_len, WriteMethod **write_method)
 591 {
 592   struct bgp *bgp;
 593
 594   if (smux_header_generic(v, name, length, exact, var_len, write_method)
 595       == MATCH_FAILED)
 596     return NULL;
 597
 598   bgp = bgp_get_default ();
 599   if (!bgp)
 600     return NULL;
 601
 602   return SNMP_IPADDRESS (bgp->router_id);
 603 }
 604
 605 u_char *
 606 bgpRcvdPathAttrTable (struct variable *v, oid name[], size_t *length,
 607                       int exact, size_t *var_len, WriteMethod **write_method)
 608 {
 609   /* Received Path Attribute Table.  This table contains, one entry
 610      per path to a network, path attributes received from all peers
 611      running BGP version 3 or less.  This table is obsolete, having
 612      been replaced in functionality with the bgp4PathAttrTable.  */
 613   return NULL;
 614 }
 615
 616 struct bgp_info *
 617 bgp4PathAttrLookup (struct variable *v, oid name[], size_t *length,
 618                     struct bgp *bgp, struct prefix_ipv4 *addr, int exact)
 619 {
 620   oid *offset;
 621   int offsetlen;
 622   struct bgp_info *binfo;
 623   struct bgp_info *min;
 624   struct bgp_node *rn;
 625   union sockunion su;
 626   int len;
 627   struct in_addr paddr;
 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 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   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       *var_len = binfo->attr->aspath->length;
 787       return (u_char *) binfo->attr->aspath->data;
 788       break;
 789     case BGP4PATHATTRNEXTHOP:   /* 6 */
 790       return SNMP_IPADDRESS (binfo->attr->nexthop);
 791       break;
 792     case BGP4PATHATTRMULTIEXITDISC: /* 7 */
 793       return SNMP_INTEGER (binfo->attr->med);
 794       break;
 795     case BGP4PATHATTRLOCALPREF: /* 8 */
 796       return SNMP_INTEGER (binfo->attr->local_pref);
 797       break;
 798     case BGP4PATHATTRATOMICAGGREGATE: /* 9 */
 799       return SNMP_INTEGER (1);
 800       break;
 801     case BGP4PATHATTRAGGREGATORAS: /* 10 */
 802       return SNMP_INTEGER (binfo->attr->aggregator_as);
 803       break;
 804     case BGP4PATHATTRAGGREGATORADDR: /* 11 */
 805       return SNMP_IPADDRESS (binfo->attr->aggregator_addr);
 806       break;
 807     case BGP4PATHATTRCALCLOCALPREF: /* 12 */
 808       return SNMP_INTEGER (-1);
 809       break;
 810     case BGP4PATHATTRBEST:      /* 13 */
 811 #define BGP4_PathAttrBest_false 1
 812 #define BGP4_PathAttrBest_true  2
 813       if (CHECK_FLAG (binfo->flags, BGP_INFO_SELECTED))
 814         return SNMP_INTEGER (BGP4_PathAttrBest_true);
 815       else
 816         return SNMP_INTEGER (BGP4_PathAttrBest_false);
 817       break;
 818     case BGP4PATHATTRUNKNOWN:   /* 14 */
 819       *var_len = 0;
 820       return NULL;
 821       break;
 822     }
 823   return NULL;
 824 }
 825 \f
 826 /* BGP Traps. */
 827 struct trap_object bgpTrapList[] =
 828 {
 829   {bgpPeerTable, 3, {3, 1, BGPPEERLASTERROR}},
 830   {bgpPeerTable, 3, {3, 1, BGPPEERSTATE}}
 831 };
 832
 833 void
 834 bgpTrapEstablished (struct peer *peer)
 835 {
 836   int ret;
 837   struct in_addr addr;
 838   oid index[sizeof (oid) * IN_ADDR_SIZE];
 839
 840   ret = inet_aton (peer->host, &addr);
 841   if (ret == 0)
 842     return;
 843
 844   oid_copy_addr (index, &addr, IN_ADDR_SIZE);
 845
 846   smux_trap (bgp_oid, sizeof bgp_oid / sizeof (oid),
 847              index, IN_ADDR_SIZE,
 848              bgpTrapList, sizeof bgpTrapList / sizeof (struct trap_object),
 849              bm->start_time - time (NULL), BGPESTABLISHED);
 850 }
 851
 852 void
 853 bgpTrapBackwardTransition (struct peer *peer)
 854 {
 855   int ret;
 856   struct in_addr addr;
 857   oid index[sizeof (oid) * IN_ADDR_SIZE];
 858
 859   ret = inet_aton (peer->host, &addr);
 860   if (ret == 0)
 861     return;
 862
 863   oid_copy_addr (index, &addr, IN_ADDR_SIZE);
 864
 865   smux_trap (bgp_oid, sizeof bgp_oid / sizeof (oid),
 866              index, IN_ADDR_SIZE,
 867              bgpTrapList, sizeof bgpTrapList / sizeof (struct trap_object),
 868              bm->start_time - time (NULL), BGPBACKWARDTRANSITION);
 869 }
 870
 871 void
 872 bgp_snmp_init ()
 873 {
 874   smux_init (bgpd_oid, sizeof bgpd_oid / sizeof (oid));
 875   REGISTER_MIB("mibII/bgp", bgp_variables, variable, bgp_oid);
 876   smux_start ();
 877 }
 878 #endif /* HAVE_SNMP */