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 #ifdef HAVE_NETSNMP
  25 #include <net-snmp/net-snmp-config.h>
  26 #include <net-snmp/net-snmp-includes.h>
  27 #else
  28 #include <asn1.h>
  29 #include <snmp.h>
  30 #include <snmp_impl.h>
  31 #endif
  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 #include "bgpd/bgp_snmp.h"
  47 \f
  48 /* BGP4-MIB described in RFC1657. */
  49 #define BGP4MIB 1,3,6,1,2,1,15
  50
  51 /* BGP TRAP. */
  52 #define BGPESTABLISHED                  1
  53 #define BGPBACKWARDTRANSITION           2
  54
  55 /* BGP MIB bgpVersion. */
  56 #define BGPVERSION                            0
  57
  58 /* BGP MIB bgpLocalAs. */
  59 #define BGPLOCALAS                            0
  60
  61 /* BGP MIB bgpPeerTable. */
  62 #define BGPPEERIDENTIFIER                     1
  63 #define BGPPEERSTATE                          2
  64 #define BGPPEERADMINSTATUS                    3
  65 #define BGPPEERNEGOTIATEDVERSION              4
  66 #define BGPPEERLOCALADDR                      5
  67 #define BGPPEERLOCALPORT                      6
  68 #define BGPPEERREMOTEADDR                     7
  69 #define BGPPEERREMOTEPORT                     8
  70 #define BGPPEERREMOTEAS                       9
  71 #define BGPPEERINUPDATES                     10
  72 #define BGPPEEROUTUPDATES                    11
  73 #define BGPPEERINTOTALMESSAGES               12
  74 #define BGPPEEROUTTOTALMESSAGES              13
  75 #define BGPPEERLASTERROR                     14
  76 #define BGPPEERFSMESTABLISHEDTRANSITIONS     15
  77 #define BGPPEERFSMESTABLISHEDTIME            16
  78 #define BGPPEERCONNECTRETRYINTERVAL          17
  79 #define BGPPEERHOLDTIME                      18
  80 #define BGPPEERKEEPALIVE                     19
  81 #define BGPPEERHOLDTIMECONFIGURED            20
  82 #define BGPPEERKEEPALIVECONFIGURED           21
  83 #define BGPPEERMINASORIGINATIONINTERVAL      22
  84 #define BGPPEERMINROUTEADVERTISEMENTINTERVAL 23
  85 #define BGPPEERINUPDATEELAPSEDTIME           24
  86
  87 /* BGP MIB bgpIdentifier. */
  88 #define BGPIDENTIFIER                         0
  89
  90 /* BGP MIB bgpRcvdPathAttrTable */
  91 #define BGPPATHATTRPEER                       1
  92 #define BGPPATHATTRDESTNETWORK                2
  93 #define BGPPATHATTRORIGIN                     3
  94 #define BGPPATHATTRASPATH                     4
  95 #define BGPPATHATTRNEXTHOP                    5
  96 #define BGPPATHATTRINTERASMETRIC              6
  97
  98 /* BGP MIB bgp4PathAttrTable. */
  99 #define BGP4PATHATTRPEER                      1
 100 #define BGP4PATHATTRIPADDRPREFIXLEN           2
 101 #define BGP4PATHATTRIPADDRPREFIX              3
 102 #define BGP4PATHATTRORIGIN                    4
 103 #define BGP4PATHATTRASPATHSEGMENT             5
 104 #define BGP4PATHATTRNEXTHOP                   6
 105 #define BGP4PATHATTRMULTIEXITDISC             7
 106 #define BGP4PATHATTRLOCALPREF                 8
 107 #define BGP4PATHATTRATOMICAGGREGATE           9
 108 #define BGP4PATHATTRAGGREGATORAS             10
 109 #define BGP4PATHATTRAGGREGATORADDR           11
 110 #define BGP4PATHATTRCALCLOCALPREF            12
 111 #define BGP4PATHATTRBEST                     13
 112 #define BGP4PATHATTRUNKNOWN                  14
 113
 114 /* SNMP value hack. */
 115 #define INTEGER ASN_INTEGER
 116 #define INTEGER32 ASN_INTEGER
 117 #define COUNTER32 ASN_COUNTER
 118 #define OCTET_STRING ASN_OCTET_STR
 119 #define IPADDRESS ASN_IPADDRESS
 120 #define GAUGE32 ASN_UNSIGNED
 121 \f
 122 /* Declare static local variables for convenience. */
 123 SNMP_LOCAL_VARIABLES
 124
 125 /* BGP-MIB instances. */
 126 oid bgp_oid [] = { BGP4MIB };
 127
 128 /* IP address 0.0.0.0. */
 129 static struct in_addr bgp_empty_addr = {0};
 130
 131 /* Hook functions. */
 132 static u_char *bgpVersion (struct variable *, oid [], size_t *, int,
 133                            size_t *, WriteMethod **);
 134 static u_char *bgpLocalAs (struct variable *, oid [], size_t *,
 135                            int, size_t *, WriteMethod **);
 136 static u_char *bgpPeerTable (struct variable *, oid [], size_t *,
 137                              int, size_t *, WriteMethod **);
 138 static u_char *bgpRcvdPathAttrTable (struct variable *, oid [], size_t *,
 139                                      int, size_t *, WriteMethod **);
 140 static u_char *bgpIdentifier (struct variable *, oid [], size_t *,
 141                               int, size_t *, WriteMethod **);
 142 static u_char *bgp4PathAttrTable (struct variable *, oid [], size_t *,
 143                                   int, size_t *, WriteMethod **);
 144 /* static u_char *bgpTraps (); */
 145
 146 struct variable bgp_variables[] =
 147 {
 148   /* BGP version. */
 149   {BGPVERSION,                OCTET_STRING, RONLY, bgpVersion,
 150    1, {1}},
 151   /* BGP local AS. */
 152   {BGPLOCALAS,                INTEGER, RONLY, bgpLocalAs,
 153    1, {2}},
 154   /* BGP peer table. */
 155   {BGPPEERIDENTIFIER,         IPADDRESS, RONLY, bgpPeerTable,
 156    3, {3, 1, 1}},
 157   {BGPPEERSTATE,              INTEGER, RONLY, bgpPeerTable,
 158    3, {3, 1, 2}},
 159   {BGPPEERADMINSTATUS,        INTEGER, RWRITE, bgpPeerTable,
 160    3, {3, 1, 3}},
 161   {BGPPEERNEGOTIATEDVERSION,  INTEGER32, RONLY, bgpPeerTable,
 162    3, {3, 1, 4}},
 163   {BGPPEERLOCALADDR,          IPADDRESS, RONLY, bgpPeerTable,
 164    3, {3, 1, 5}},
 165   {BGPPEERLOCALPORT,          INTEGER, RONLY, bgpPeerTable,
 166    3, {3, 1, 6}},
 167   {BGPPEERREMOTEADDR,         IPADDRESS, RONLY, bgpPeerTable,
 168    3, {3, 1, 7}},
 169   {BGPPEERREMOTEPORT,         INTEGER, RONLY, bgpPeerTable,
 170    3, {3, 1, 8}},
 171   {BGPPEERREMOTEAS,           INTEGER, RONLY, bgpPeerTable,
 172    3, {3, 1, 9}},
 173   {BGPPEERINUPDATES,          COUNTER32, RONLY, bgpPeerTable,
 174    3, {3, 1, 10}},
 175   {BGPPEEROUTUPDATES,         COUNTER32, RONLY, bgpPeerTable,
 176    3, {3, 1, 11}},
 177   {BGPPEERINTOTALMESSAGES,    COUNTER32, RONLY, bgpPeerTable,
 178    3, {3, 1, 12}},
 179   {BGPPEEROUTTOTALMESSAGES,   COUNTER32, RONLY, bgpPeerTable,
 180    3, {3, 1, 13}},
 181   {BGPPEERLASTERROR,          OCTET_STRING, RONLY, bgpPeerTable,
 182    3, {3, 1, 14}},
 183   {BGPPEERFSMESTABLISHEDTRANSITIONS, COUNTER32, RONLY, bgpPeerTable,
 184    3, {3, 1, 15}},
 185   {BGPPEERFSMESTABLISHEDTIME, GAUGE32, RONLY, bgpPeerTable,
 186    3, {3, 1, 16}},
 187   {BGPPEERCONNECTRETRYINTERVAL, INTEGER, RWRITE, bgpPeerTable,
 188    3, {3, 1, 17}},
 189   {BGPPEERHOLDTIME,           INTEGER, RONLY, bgpPeerTable,
 190    3, {3, 1, 18}},
 191   {BGPPEERKEEPALIVE,          INTEGER, RONLY, bgpPeerTable,
 192    3, {3, 1, 19}},
 193   {BGPPEERHOLDTIMECONFIGURED, INTEGER, RWRITE, bgpPeerTable,
 194    3, {3, 1, 20}},
 195   {BGPPEERKEEPALIVECONFIGURED, INTEGER, RWRITE, bgpPeerTable,
 196    3, {3, 1, 21}},
 197   {BGPPEERMINASORIGINATIONINTERVAL, INTEGER, RWRITE, bgpPeerTable,
 198    3, {3, 1, 22}},
 199   {BGPPEERMINROUTEADVERTISEMENTINTERVAL, INTEGER, RWRITE, bgpPeerTable,
 200    3, {3, 1, 23}},
 201   {BGPPEERINUPDATEELAPSEDTIME, GAUGE32, RONLY, bgpPeerTable,
 202    3, {3, 1, 24}},
 203   /* BGP identifier. */
 204   {BGPIDENTIFIER,             IPADDRESS, RONLY, bgpIdentifier,
 205    1, {4}},
 206   /* BGP received path attribute table. */
 207   {BGPPATHATTRPEER,           IPADDRESS, RONLY, bgpRcvdPathAttrTable,
 208    3, {5, 1, 1}},
 209   {BGPPATHATTRDESTNETWORK,    IPADDRESS, RONLY, bgpRcvdPathAttrTable,
 210    3, {5, 1, 2}},
 211   {BGPPATHATTRORIGIN,         INTEGER, RONLY, bgpRcvdPathAttrTable,
 212    3, {5, 1, 3}},
 213   {BGPPATHATTRASPATH,         OCTET_STRING, RONLY, bgpRcvdPathAttrTable,
 214    3, {5, 1, 4}},
 215   {BGPPATHATTRNEXTHOP,        IPADDRESS, RONLY, bgpRcvdPathAttrTable,
 216    3, {5, 1, 5}},
 217   {BGPPATHATTRINTERASMETRIC,  INTEGER32, RONLY, bgpRcvdPathAttrTable,
 218    3, {5, 1, 6}},
 219   /* BGP-4 received path attribute table. */
 220   {BGP4PATHATTRPEER, IPADDRESS, RONLY, bgp4PathAttrTable,
 221    3, {6, 1, 1}},
 222   {BGP4PATHATTRIPADDRPREFIXLEN, INTEGER, RONLY, bgp4PathAttrTable,
 223    3, {6, 1, 2}},
 224   {BGP4PATHATTRIPADDRPREFIX,  IPADDRESS, RONLY, bgp4PathAttrTable,
 225    3, {6, 1, 3}},
 226   {BGP4PATHATTRORIGIN,        INTEGER, RONLY, bgp4PathAttrTable,
 227    3, {6, 1, 4}},
 228   {BGP4PATHATTRASPATHSEGMENT, OCTET_STRING, RONLY, bgp4PathAttrTable,
 229    3, {6, 1, 5}},
 230   {BGP4PATHATTRNEXTHOP,       IPADDRESS, RONLY, bgp4PathAttrTable,
 231    3, {6, 1, 6}},
 232   {BGP4PATHATTRMULTIEXITDISC, INTEGER, RONLY, bgp4PathAttrTable,
 233    3, {6, 1, 7}},
 234   {BGP4PATHATTRLOCALPREF,     INTEGER, RONLY, bgp4PathAttrTable,
 235    3, {6, 1, 8}},
 236   {BGP4PATHATTRATOMICAGGREGATE, INTEGER, RONLY, bgp4PathAttrTable,
 237    3, {6, 1, 9}},
 238   {BGP4PATHATTRAGGREGATORAS,  INTEGER, RONLY, bgp4PathAttrTable,
 239    3, {6, 1, 10}},
 240   {BGP4PATHATTRAGGREGATORADDR, IPADDRESS, RONLY, bgp4PathAttrTable,
 241    3, {6, 1, 11}},
 242   {BGP4PATHATTRCALCLOCALPREF, INTEGER, RONLY, bgp4PathAttrTable,
 243    3, {6, 1, 12}},
 244   {BGP4PATHATTRBEST,          INTEGER, RONLY, bgp4PathAttrTable,
 245    3, {6, 1, 13}},
 246   {BGP4PATHATTRUNKNOWN,       OCTET_STRING, RONLY, bgp4PathAttrTable,
 247    3, {6, 1, 14}},
 248 };
 249
 250 \f
 251 static u_char *
 252 bgpVersion (struct variable *v, oid name[], size_t *length, int exact,
 253             size_t *var_len, WriteMethod **write_method)
 254 {
 255   static u_char version;
 256
 257   if (smux_header_generic(v, name, length, exact, var_len, write_method)
 258       == MATCH_FAILED)
 259     return NULL;
 260
 261   /* Retrun BGP version.  Zebra bgpd only support version 4. */
 262   version = (0x80 >> (BGP_VERSION_4 - 1));
 263
 264   /* Return octet string length 1. */
 265   *var_len = 1;
 266   return (u_char *)&version;
 267 }
 268
 269 static u_char *
 270 bgpLocalAs (struct variable *v, oid name[], size_t *length,
 271             int exact, size_t *var_len, WriteMethod **write_method)
 272 {
 273   struct bgp *bgp;
 274
 275   if (smux_header_generic(v, name, length, exact, var_len, write_method)
 276       == MATCH_FAILED)
 277     return NULL;
 278
 279   /* Get BGP structure. */
 280   bgp = bgp_get_default ();
 281   if (! bgp)
 282     return NULL;
 283
 284   return SNMP_INTEGER (bgp->as);
 285 }
 286
 287 static struct peer *
 288 peer_lookup_addr_ipv4 (struct in_addr *src)
 289 {
 290   struct bgp *bgp;
 291   struct peer *peer;
 292   struct listnode *node;
 293   struct in_addr addr;
 294   int ret;
 295
 296   bgp = bgp_get_default ();
 297   if (! bgp)
 298     return NULL;
 299
 300   for (ALL_LIST_ELEMENTS_RO (bgp->peer, node, peer))
 301     {
 302       ret = inet_pton (AF_INET, peer->host, &addr);
 303       if (ret > 0)
 304         {
 305           if (IPV4_ADDR_SAME (&addr, src))
 306             return peer;
 307         }
 308     }
 309   return NULL;
 310 }
 311
 312 static struct peer *
 313 bgp_peer_lookup_next (struct in_addr *src)
 314 {
 315   struct bgp *bgp;
 316   struct peer *peer;
 317   struct listnode *node;
 318   struct in_addr *p;
 319   union sockunion su;
 320   int ret;
 321
 322   memset (&su, 0, sizeof (union sockunion));
 323
 324   bgp = bgp_get_default ();
 325   if (! bgp)
 326     return NULL;
 327
 328   for (ALL_LIST_ELEMENTS_RO (bgp->peer, node, peer))
 329     {
 330       ret = inet_pton (AF_INET, peer->host, &su.sin.sin_addr);
 331       if (ret > 0)
 332         {
 333           p = &su.sin.sin_addr;
 334
 335           if (ntohl (p->s_addr) > ntohl (src->s_addr))
 336             {
 337               src->s_addr = p->s_addr;
 338               return peer;
 339             }
 340         }
 341     }
 342   return NULL;
 343 }
 344
 345 static struct peer *
 346 bgpPeerTable_lookup (struct variable *v, oid name[], size_t *length,
 347                      struct in_addr *addr, int exact)
 348 {
 349   struct peer *peer = NULL;
 350   int len;
 351
 352   if (exact)
 353     {
 354       /* Check the length. */
 355       if (*length - v->namelen != sizeof (struct in_addr))
 356         return NULL;
 357
 358       oid2in_addr (name + v->namelen, IN_ADDR_SIZE, addr);
 359
 360       peer = peer_lookup_addr_ipv4 (addr);
 361       return peer;
 362     }
 363   else
 364     {
 365       len = *length - v->namelen;
 366       if (len > 4) len = 4;
 367
 368       oid2in_addr (name + v->namelen, len, addr);
 369
 370       peer = bgp_peer_lookup_next (addr);
 371
 372       if (peer == NULL)
 373         return NULL;
 374
 375       oid_copy_addr (name + v->namelen, addr, sizeof (struct in_addr));
 376       *length = sizeof (struct in_addr) + v->namelen;
 377
 378       return peer;
 379     }
 380   return NULL;
 381 }
 382
 383 /* BGP write methods. */
 384 static int
 385 write_bgpPeerTable (int action, u_char *var_val,
 386                     u_char var_val_type, size_t var_val_len,
 387                     u_char *statP, oid *name, size_t length,
 388                     struct variable *v)
 389 {
 390   struct in_addr addr;
 391   struct peer *peer;
 392   long intval;
 393   size_t bigsize = SNMP_MAX_LEN;
 394
 395   if (var_val_type != ASN_INTEGER)
 396     {
 397       return SNMP_ERR_WRONGTYPE;
 398     }
 399   if (var_val_len != sizeof (long))
 400     {
 401       return SNMP_ERR_WRONGLENGTH;
 402     }
 403
 404   if (! asn_parse_int(var_val, &bigsize, &var_val_type,
 405                       &intval, sizeof(long)))
 406     {
 407       return SNMP_ERR_WRONGENCODING;
 408     }
 409
 410   memset (&addr, 0, sizeof (struct in_addr));
 411
 412   peer = bgpPeerTable_lookup (v, name, &length, &addr, 1);
 413   if (! peer)
 414     return SNMP_ERR_NOSUCHNAME;
 415
 416   printf ("val: %ld\n", intval);
 417
 418   switch (v->magic)
 419     {
 420     case BGPPEERADMINSTATUS:
 421 #define BGP_PeerAdmin_stop  1
 422 #define BGP_PeerAdmin_start 2
 423       /* When the peer is established,   */
 424       if (intval == BGP_PeerAdmin_stop)
 425         BGP_EVENT_ADD (peer, BGP_Stop);
 426       else if (intval == BGP_PeerAdmin_start)
 427         ;                       /* Do nothing. */
 428       else
 429         return SNMP_ERR_NOSUCHNAME;
 430       break;
 431     case BGPPEERCONNECTRETRYINTERVAL:
 432       SET_FLAG (peer->config, PEER_CONFIG_CONNECT);
 433       peer->connect = intval;
 434       peer->v_connect = intval;
 435       break;
 436     case BGPPEERHOLDTIMECONFIGURED:
 437       SET_FLAG (peer->config, PEER_CONFIG_TIMER);
 438       peer->holdtime = intval;
 439       peer->v_holdtime = intval;
 440       break;
 441     case BGPPEERKEEPALIVECONFIGURED:
 442       SET_FLAG (peer->config, PEER_CONFIG_TIMER);
 443       peer->keepalive = intval;
 444       peer->v_keepalive = intval;
 445       break;
 446     case BGPPEERMINASORIGINATIONINTERVAL:
 447       peer->v_asorig = intval;
 448       break;
 449     case BGPPEERMINROUTEADVERTISEMENTINTERVAL:
 450       peer->v_routeadv = intval;
 451       break;
 452     }
 453   return SNMP_ERR_NOERROR;
 454 }
 455
 456 static u_char *
 457 bgpPeerTable (struct variable *v, oid name[], size_t *length,
 458               int exact, size_t *var_len, WriteMethod **write_method)
 459 {
 460   static struct in_addr addr;
 461   struct peer *peer;
 462
 463   *write_method = NULL;
 464   memset (&addr, 0, sizeof (struct in_addr));
 465
 466   peer = bgpPeerTable_lookup (v, name, length, &addr, exact);
 467   if (! peer)
 468     return NULL;
 469
 470   switch (v->magic)
 471     {
 472     case BGPPEERIDENTIFIER:
 473       return SNMP_IPADDRESS (peer->remote_id);
 474       break;
 475     case BGPPEERSTATE:
 476       return SNMP_INTEGER (peer->status);
 477       break;
 478     case BGPPEERADMINSTATUS:
 479       *write_method = write_bgpPeerTable;
 480 #define BGP_PeerAdmin_stop  1
 481 #define BGP_PeerAdmin_start 2
 482       if (CHECK_FLAG (peer->flags, PEER_FLAG_SHUTDOWN))
 483         return SNMP_INTEGER (BGP_PeerAdmin_stop);
 484       else
 485         return SNMP_INTEGER (BGP_PeerAdmin_start);
 486       break;
 487     case BGPPEERNEGOTIATEDVERSION:
 488       return SNMP_INTEGER (BGP_VERSION_4);
 489       break;
 490     case BGPPEERLOCALADDR:
 491       if (peer->su_local)
 492         return SNMP_IPADDRESS (peer->su_local->sin.sin_addr);
 493       else
 494         return SNMP_IPADDRESS (bgp_empty_addr);
 495       break;
 496     case BGPPEERLOCALPORT:
 497       if (peer->su_local)
 498         return SNMP_INTEGER (ntohs (peer->su_local->sin.sin_port));
 499       else
 500         return SNMP_INTEGER (0);
 501       break;
 502     case BGPPEERREMOTEADDR:
 503       if (peer->su_remote)
 504         return SNMP_IPADDRESS (peer->su_remote->sin.sin_addr);
 505       else
 506         return SNMP_IPADDRESS (bgp_empty_addr);
 507       break;
 508     case BGPPEERREMOTEPORT:
 509       if (peer->su_remote)
 510         return SNMP_INTEGER (ntohs (peer->su_remote->sin.sin_port));
 511       else
 512         return SNMP_INTEGER (0);
 513       break;
 514     case BGPPEERREMOTEAS:
 515       return SNMP_INTEGER (peer->as);
 516       break;
 517     case BGPPEERINUPDATES:
 518       return SNMP_INTEGER (peer->update_in);
 519       break;
 520     case BGPPEEROUTUPDATES:
 521       return SNMP_INTEGER (peer->update_out);
 522       break;
 523     case BGPPEERINTOTALMESSAGES:
 524       return SNMP_INTEGER (peer->open_in + peer->update_in
 525                            + peer->keepalive_in + peer->notify_in
 526                            + peer->refresh_in + peer->dynamic_cap_in);
 527       break;
 528     case BGPPEEROUTTOTALMESSAGES:
 529       return SNMP_INTEGER (peer->open_out + peer->update_out
 530                            + peer->keepalive_out + peer->notify_out
 531                            + peer->refresh_out + peer->dynamic_cap_out);
 532       break;
 533     case BGPPEERLASTERROR:
 534       {
 535         static u_char lasterror[2];
 536         lasterror[0] = peer->notify.code;
 537         lasterror[1] = peer->notify.subcode;
 538         *var_len = 2;
 539         return (u_char *)&lasterror;
 540       }
 541       break;
 542     case BGPPEERFSMESTABLISHEDTRANSITIONS:
 543       return SNMP_INTEGER (peer->established);
 544       break;
 545     case BGPPEERFSMESTABLISHEDTIME:
 546       if (peer->uptime == 0)
 547         return SNMP_INTEGER (0);
 548       else
 549         return SNMP_INTEGER (time (NULL) - peer->uptime);
 550       break;
 551     case BGPPEERCONNECTRETRYINTERVAL:
 552       *write_method = write_bgpPeerTable;
 553       return SNMP_INTEGER (peer->v_connect);
 554       break;
 555     case BGPPEERHOLDTIME:
 556       return SNMP_INTEGER (peer->v_holdtime);
 557       break;
 558     case BGPPEERKEEPALIVE:
 559       return SNMP_INTEGER (peer->v_keepalive);
 560       break;
 561     case BGPPEERHOLDTIMECONFIGURED:
 562       *write_method = write_bgpPeerTable;
 563       if (CHECK_FLAG (peer->config, PEER_CONFIG_TIMER))
 564         return SNMP_INTEGER (peer->holdtime);
 565       else
 566         return SNMP_INTEGER (peer->v_holdtime);
 567       break;
 568     case BGPPEERKEEPALIVECONFIGURED:
 569       *write_method = write_bgpPeerTable;
 570       if (CHECK_FLAG (peer->config, PEER_CONFIG_TIMER))
 571         return SNMP_INTEGER (peer->keepalive);
 572       else
 573         return SNMP_INTEGER (peer->v_keepalive);
 574       break;
 575     case BGPPEERMINASORIGINATIONINTERVAL:
 576       *write_method = write_bgpPeerTable;
 577       return SNMP_INTEGER (peer->v_asorig);
 578       break;
 579     case BGPPEERMINROUTEADVERTISEMENTINTERVAL:
 580       *write_method = write_bgpPeerTable;
 581       return SNMP_INTEGER (peer->v_routeadv);
 582       break;
 583     case BGPPEERINUPDATEELAPSEDTIME:
 584       if (peer->update_time == 0)
 585         return SNMP_INTEGER (0);
 586       else
 587         return SNMP_INTEGER (time (NULL) - peer->update_time);
 588       break;
 589     default:
 590       return NULL;
 591       break;
 592     }
 593   return NULL;
 594 }
 595
 596 static u_char *
 597 bgpIdentifier (struct variable *v, oid name[], size_t *length,
 598                int exact, size_t *var_len, WriteMethod **write_method)
 599 {
 600   struct bgp *bgp;
 601
 602   if (smux_header_generic(v, name, length, exact, var_len, write_method)
 603       == MATCH_FAILED)
 604     return NULL;
 605
 606   bgp = bgp_get_default ();
 607   if (!bgp)
 608     return NULL;
 609
 610   return SNMP_IPADDRESS (bgp->router_id);
 611 }
 612
 613 static u_char *
 614 bgpRcvdPathAttrTable (struct variable *v, oid name[], size_t *length,
 615                       int exact, size_t *var_len, WriteMethod **write_method)
 616 {
 617   /* Received Path Attribute Table.  This table contains, one entry
 618      per path to a network, path attributes received from all peers
 619      running BGP version 3 or less.  This table is obsolete, having
 620      been replaced in functionality with the bgp4PathAttrTable.  */
 621   return NULL;
 622 }
 623
 624 static struct bgp_info *
 625 bgp4PathAttrLookup (struct variable *v, oid name[], size_t *length,
 626                     struct bgp *bgp, struct prefix_ipv4 *addr, int exact)
 627 {
 628   oid *offset;
 629   int offsetlen;
 630   struct bgp_info *binfo;
 631   struct bgp_info *min;
 632   struct bgp_node *rn;
 633   union sockunion su;
 634   unsigned int len;
 635   struct in_addr paddr;
 636
 637 #define BGP_PATHATTR_ENTRY_OFFSET \
 638           (IN_ADDR_SIZE + 1 + IN_ADDR_SIZE)
 639
 640   if (exact)
 641     {
 642       if (*length - v->namelen != BGP_PATHATTR_ENTRY_OFFSET)
 643         return NULL;
 644
 645       /* Set OID offset for prefix. */
 646       offset = name + v->namelen;
 647       oid2in_addr (offset, IN_ADDR_SIZE, &addr->prefix);
 648       offset += IN_ADDR_SIZE;
 649
 650       /* Prefix length. */
 651       addr->prefixlen = *offset;
 652       offset++;
 653
 654       /* Peer address. */
 655       su.sin.sin_family = AF_INET;
 656       oid2in_addr (offset, IN_ADDR_SIZE, &su.sin.sin_addr);
 657
 658       /* Lookup node. */
 659       rn = bgp_node_lookup (bgp->rib[AFI_IP][SAFI_UNICAST],
 660                               (struct prefix *) addr);
 661       if (rn)
 662         {
 663           bgp_unlock_node (rn);
 664
 665           for (binfo = rn->info; binfo; binfo = binfo->next)
 666             if (sockunion_same (&binfo->peer->su, &su))
 667               return binfo;
 668         }
 669     }
 670   else
 671     {
 672       offset = name + v->namelen;
 673       offsetlen = *length - v->namelen;
 674       len = offsetlen;
 675
 676       if (offsetlen == 0)
 677         rn = bgp_table_top (bgp->rib[AFI_IP][SAFI_UNICAST]);
 678       else
 679         {
 680           if (len > IN_ADDR_SIZE)
 681             len = IN_ADDR_SIZE;
 682
 683           oid2in_addr (offset, len, &addr->prefix);
 684
 685           offset += IN_ADDR_SIZE;
 686           offsetlen -= IN_ADDR_SIZE;
 687
 688           if (offsetlen > 0)
 689             addr->prefixlen = *offset;
 690           else
 691             addr->prefixlen = len * 8;
 692
 693           rn = bgp_node_get (bgp->rib[AFI_IP][SAFI_UNICAST],
 694                                (struct prefix *) addr);
 695
 696           offset++;
 697           offsetlen--;
 698         }
 699
 700       if (offsetlen > 0)
 701         {
 702           len = offsetlen;
 703           if (len > IN_ADDR_SIZE)
 704             len = IN_ADDR_SIZE;
 705
 706           oid2in_addr (offset, len, &paddr);
 707         }
 708       else
 709         paddr.s_addr = 0;
 710
 711       if (! rn)
 712         return NULL;
 713
 714       do
 715         {
 716           min = NULL;
 717
 718           for (binfo = rn->info; binfo; binfo = binfo->next)
 719             {
 720               if (binfo->peer->su.sin.sin_family == AF_INET
 721                   && ntohl (paddr.s_addr)
 722                   < ntohl (binfo->peer->su.sin.sin_addr.s_addr))
 723                 {
 724                   if (min)
 725                     {
 726                       if (ntohl (binfo->peer->su.sin.sin_addr.s_addr)
 727                           < ntohl (min->peer->su.sin.sin_addr.s_addr))
 728                         min = binfo;
 729                     }
 730                   else
 731                     min = binfo;
 732                 }
 733             }
 734
 735           if (min)
 736             {
 737               *length = v->namelen + BGP_PATHATTR_ENTRY_OFFSET;
 738
 739               offset = name + v->namelen;
 740               oid_copy_addr (offset, &rn->p.u.prefix4, IN_ADDR_SIZE);
 741               offset += IN_ADDR_SIZE;
 742               *offset = rn->p.prefixlen;
 743               offset++;
 744               oid_copy_addr (offset, &min->peer->su.sin.sin_addr,
 745                              IN_ADDR_SIZE);
 746               addr->prefix = rn->p.u.prefix4;
 747               addr->prefixlen = rn->p.prefixlen;
 748
 749               bgp_unlock_node (rn);
 750
 751               return min;
 752             }
 753
 754           paddr.s_addr = 0;
 755         }
 756       while ((rn = bgp_route_next (rn)) != NULL);
 757     }
 758   return NULL;
 759 }
 760
 761 static u_char *
 762 bgp4PathAttrTable (struct variable *v, oid name[], size_t *length,
 763                    int exact, size_t *var_len, WriteMethod **write_method)
 764 {
 765   struct bgp *bgp;
 766   struct bgp_info *binfo;
 767   struct prefix_ipv4 addr;
 768
 769   bgp = bgp_get_default ();
 770   if (! bgp)
 771     return NULL;
 772
 773   memset (&addr, 0, sizeof (struct prefix_ipv4));
 774
 775   binfo = bgp4PathAttrLookup (v, name, length, bgp, &addr, exact);
 776   if (! binfo)
 777     return NULL;
 778
 779   switch (v->magic)
 780     {
 781     case BGP4PATHATTRPEER:      /* 1 */
 782       return SNMP_IPADDRESS (binfo->peer->su.sin.sin_addr);
 783       break;
 784     case BGP4PATHATTRIPADDRPREFIXLEN: /* 2 */
 785       return SNMP_INTEGER (addr.prefixlen);
 786       break;
 787     case BGP4PATHATTRIPADDRPREFIX: /* 3 */
 788       return SNMP_IPADDRESS (addr.prefix);
 789       break;
 790     case BGP4PATHATTRORIGIN:    /* 4 */
 791       return SNMP_INTEGER (binfo->attr->origin);
 792       break;
 793     case BGP4PATHATTRASPATHSEGMENT: /* 5 */
 794       return aspath_snmp_pathseg (binfo->attr->aspath, var_len);
 795       break;
 796     case BGP4PATHATTRNEXTHOP:   /* 6 */
 797       return SNMP_IPADDRESS (binfo->attr->nexthop);
 798       break;
 799     case BGP4PATHATTRMULTIEXITDISC: /* 7 */
 800       return SNMP_INTEGER (binfo->attr->med);
 801       break;
 802     case BGP4PATHATTRLOCALPREF: /* 8 */
 803       return SNMP_INTEGER (binfo->attr->local_pref);
 804       break;
 805     case BGP4PATHATTRATOMICAGGREGATE: /* 9 */
 806       return SNMP_INTEGER (1);
 807       break;
 808     case BGP4PATHATTRAGGREGATORAS: /* 10 */
 809       if (binfo->attr->extra)
 810         return SNMP_INTEGER (binfo->attr->extra->aggregator_as);
 811       else
 812         return SNMP_INTEGER (0);
 813       break;
 814     case BGP4PATHATTRAGGREGATORADDR: /* 11 */
 815       if (binfo->attr->extra)
 816         return SNMP_IPADDRESS (binfo->attr->extra->aggregator_addr);
 817       else
 818         return SNMP_INTEGER (0);
 819       break;
 820     case BGP4PATHATTRCALCLOCALPREF: /* 12 */
 821       return SNMP_INTEGER (-1);
 822       break;
 823     case BGP4PATHATTRBEST:      /* 13 */
 824 #define BGP4_PathAttrBest_false 1
 825 #define BGP4_PathAttrBest_true  2
 826       if (CHECK_FLAG (binfo->flags, BGP_INFO_SELECTED))
 827         return SNMP_INTEGER (BGP4_PathAttrBest_true);
 828       else
 829         return SNMP_INTEGER (BGP4_PathAttrBest_false);
 830       break;
 831     case BGP4PATHATTRUNKNOWN:   /* 14 */
 832       *var_len = 0;
 833       return NULL;
 834       break;
 835     }
 836   return NULL;
 837 }
 838 \f
 839 /* BGP Traps. */
 840 struct trap_object bgpTrapList[] =
 841 {
 842   {bgpPeerTable, 3, {3, 1, BGPPEERLASTERROR}},
 843   {bgpPeerTable, 3, {3, 1, BGPPEERSTATE}}
 844 };
 845
 846 void
 847 bgpTrapEstablished (struct peer *peer)
 848 {
 849   int ret;
 850   struct in_addr addr;
 851   oid index[sizeof (oid) * IN_ADDR_SIZE];
 852
 853   ret = inet_aton (peer->host, &addr);
 854   if (ret == 0)
 855     return;
 856
 857   oid_copy_addr (index, &addr, IN_ADDR_SIZE);
 858
 859   smux_trap (bgp_oid, sizeof bgp_oid / sizeof (oid),
 860              index, IN_ADDR_SIZE,
 861              bgpTrapList, sizeof bgpTrapList / sizeof (struct trap_object),
 862              bm->start_time - time (NULL), BGPESTABLISHED);
 863 }
 864
 865 void
 866 bgpTrapBackwardTransition (struct peer *peer)
 867 {
 868   int ret;
 869   struct in_addr addr;
 870   oid index[sizeof (oid) * IN_ADDR_SIZE];
 871
 872   ret = inet_aton (peer->host, &addr);
 873   if (ret == 0)
 874     return;
 875
 876   oid_copy_addr (index, &addr, IN_ADDR_SIZE);
 877
 878   smux_trap (bgp_oid, sizeof bgp_oid / sizeof (oid),
 879              index, IN_ADDR_SIZE,
 880              bgpTrapList, sizeof bgpTrapList / sizeof (struct trap_object),
 881              bm->start_time - time (NULL), BGPBACKWARDTRANSITION);
 882 }
 883
 884 void
 885 bgp_snmp_init (void)
 886 {
 887   smux_init (bm->master);
 888   REGISTER_MIB("mibII/bgp", bgp_variables, variable, bgp_oid);
 889 }
 890 #endif /* HAVE_SNMP */