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 #endif
  27 #include <asn1.h>
  28 #include <snmp.h>
  29 #include <snmp_impl.h>
  30
  31 #include "if.h"
  32 #include "log.h"
  33 #include "prefix.h"
  34 #include "command.h"
  35 #include "thread.h"
  36 #include "smux.h"
  37
  38 #include "bgpd/bgpd.h"
  39 #include "bgpd/bgp_table.h"
  40 #include "bgpd/bgp_aspath.h"
  41 #include "bgpd/bgp_attr.h"
  42 #include "bgpd/bgp_route.h"
  43 #include "bgpd/bgp_fsm.h"
  44 \f
  45 /* BGP4-MIB described in RFC1657. */
  46 #define BGP4MIB 1,3,6,1,2,1,15
  47
  48 /* BGP TRAP. */
  49 #define BGPESTABLISHED                  1
  50 #define BGPBACKWARDTRANSITION           2
  51
  52 /* BGP MIB bgpVersion. */
  53 #define BGPVERSION                            0
  54
  55 /* BGP MIB bgpLocalAs. */
  56 #define BGPLOCALAS                            0
  57
  58 /* BGP MIB bgpPeerTable. */
  59 #define BGPPEERIDENTIFIER                     1
  60 #define BGPPEERSTATE                          2
  61 #define BGPPEERADMINSTATUS                    3
  62 #define BGPPEERNEGOTIATEDVERSION              4
  63 #define BGPPEERLOCALADDR                      5
  64 #define BGPPEERLOCALPORT                      6
  65 #define BGPPEERREMOTEADDR                     7
  66 #define BGPPEERREMOTEPORT                     8
  67 #define BGPPEERREMOTEAS                       9
  68 #define BGPPEERINUPDATES                     10
  69 #define BGPPEEROUTUPDATES                    11
  70 #define BGPPEERINTOTALMESSAGES               12
  71 #define BGPPEEROUTTOTALMESSAGES              13
  72 #define BGPPEERLASTERROR                     14
  73 #define BGPPEERFSMESTABLISHEDTRANSITIONS     15
  74 #define BGPPEERFSMESTABLISHEDTIME            16
  75 #define BGPPEERCONNECTRETRYINTERVAL          17
  76 #define BGPPEERHOLDTIME                      18
  77 #define BGPPEERKEEPALIVE                     19
  78 #define BGPPEERHOLDTIMECONFIGURED            20
  79 #define BGPPEERKEEPALIVECONFIGURED           21
  80 #define BGPPEERMINASORIGINATIONINTERVAL      22
  81 #define BGPPEERMINROUTEADVERTISEMENTINTERVAL 23
  82 #define BGPPEERINUPDATEELAPSEDTIME           24
  83
  84 /* BGP MIB bgpIdentifier. */
  85 #define BGPIDENTIFIER                         0
  86
  87 /* BGP MIB bgpRcvdPathAttrTable */
  88 #define BGPPATHATTRPEER                       1
  89 #define BGPPATHATTRDESTNETWORK                2
  90 #define BGPPATHATTRORIGIN                     3
  91 #define BGPPATHATTRASPATH                     4
  92 #define BGPPATHATTRNEXTHOP                    5
  93 #define BGPPATHATTRINTERASMETRIC              6
  94
  95 /* BGP MIB bgp4PathAttrTable. */
  96 #define BGP4PATHATTRPEER                      1
  97 #define BGP4PATHATTRIPADDRPREFIXLEN           2
  98 #define BGP4PATHATTRIPADDRPREFIX              3
  99 #define BGP4PATHATTRORIGIN                    4
 100 #define BGP4PATHATTRASPATHSEGMENT             5
 101 #define BGP4PATHATTRNEXTHOP                   6
 102 #define BGP4PATHATTRMULTIEXITDISC             7
 103 #define BGP4PATHATTRLOCALPREF                 8
 104 #define BGP4PATHATTRATOMICAGGREGATE           9
 105 #define BGP4PATHATTRAGGREGATORAS             10
 106 #define BGP4PATHATTRAGGREGATORADDR           11
 107 #define BGP4PATHATTRCALCLOCALPREF            12
 108 #define BGP4PATHATTRBEST                     13
 109 #define BGP4PATHATTRUNKNOWN                  14
 110
 111 /* SNMP value hack. */
 112 #define INTEGER ASN_INTEGER
 113 #define INTEGER32 ASN_INTEGER
 114 #define COUNTER32 ASN_COUNTER
 115 #define OCTET_STRING ASN_OCTET_STR
 116 #define IPADDRESS ASN_IPADDRESS
 117 #define GAUGE32 ASN_UNSIGNED
 118 \f
 119 /* Declare static local variables for convenience. */
 120 SNMP_LOCAL_VARIABLES
 121
 122 /* BGP-MIB instances. */
 123 oid bgp_oid [] = { BGP4MIB };
 124
 125 /* IP address 0.0.0.0. */
 126 static struct in_addr bgp_empty_addr = {0};
 127
 128 /* Hook functions. */
 129 static u_char *bgpVersion ();
 130 static u_char *bgpLocalAs ();
 131 static u_char *bgpPeerTable ();
 132 static u_char *bgpRcvdPathAttrTable ();
 133 static u_char *bgpIdentifier ();
 134 static u_char *bgp4PathAttrTable ();
 135 /* static u_char *bgpTraps (); */
 136
 137 struct variable bgp_variables[] =
 138 {
 139   /* BGP version. */
 140   {BGPVERSION,                OCTET_STRING, RONLY, bgpVersion,
 141    1, {1}},
 142   /* BGP local AS. */
 143   {BGPLOCALAS,                INTEGER, RONLY, bgpLocalAs,
 144    1, {2}},
 145   /* BGP peer table. */
 146   {BGPPEERIDENTIFIER,         IPADDRESS, RONLY, bgpPeerTable,
 147    3, {3, 1, 1}},
 148   {BGPPEERSTATE,              INTEGER, RONLY, bgpPeerTable,
 149    3, {3, 1, 2}},
 150   {BGPPEERADMINSTATUS,        INTEGER, RWRITE, bgpPeerTable,
 151    3, {3, 1, 3}},
 152   {BGPPEERNEGOTIATEDVERSION,  INTEGER32, RONLY, bgpPeerTable,
 153    3, {3, 1, 4}},
 154   {BGPPEERLOCALADDR,          IPADDRESS, RONLY, bgpPeerTable,
 155    3, {3, 1, 5}},
 156   {BGPPEERLOCALPORT,          INTEGER, RONLY, bgpPeerTable,
 157    3, {3, 1, 6}},
 158   {BGPPEERREMOTEADDR,         IPADDRESS, RONLY, bgpPeerTable,
 159    3, {3, 1, 7}},
 160   {BGPPEERREMOTEPORT,         INTEGER, RONLY, bgpPeerTable,
 161    3, {3, 1, 8}},
 162   {BGPPEERREMOTEAS,           INTEGER, RONLY, bgpPeerTable,
 163    3, {3, 1, 9}},
 164   {BGPPEERINUPDATES,          COUNTER32, RONLY, bgpPeerTable,
 165    3, {3, 1, 10}},
 166   {BGPPEEROUTUPDATES,         COUNTER32, RONLY, bgpPeerTable,
 167    3, {3, 1, 11}},
 168   {BGPPEERINTOTALMESSAGES,    COUNTER32, RONLY, bgpPeerTable,
 169    3, {3, 1, 12}},
 170   {BGPPEEROUTTOTALMESSAGES,   COUNTER32, RONLY, bgpPeerTable,
 171    3, {3, 1, 13}},
 172   {BGPPEERLASTERROR,          OCTET_STRING, RONLY, bgpPeerTable,
 173    3, {3, 1, 14}},
 174   {BGPPEERFSMESTABLISHEDTRANSITIONS, COUNTER32, RONLY, bgpPeerTable,
 175    3, {3, 1, 15}},
 176   {BGPPEERFSMESTABLISHEDTIME, GAUGE32, RONLY, bgpPeerTable,
 177    3, {3, 1, 16}},
 178   {BGPPEERCONNECTRETRYINTERVAL, INTEGER, RWRITE, bgpPeerTable,
 179    3, {3, 1, 17}},
 180   {BGPPEERHOLDTIME,           INTEGER, RONLY, bgpPeerTable,
 181    3, {3, 1, 18}},
 182   {BGPPEERKEEPALIVE,          INTEGER, RONLY, bgpPeerTable,
 183    3, {3, 1, 19}},
 184   {BGPPEERHOLDTIMECONFIGURED, INTEGER, RWRITE, bgpPeerTable,
 185    3, {3, 1, 20}},
 186   {BGPPEERKEEPALIVECONFIGURED, INTEGER, RWRITE, bgpPeerTable,
 187    3, {3, 1, 21}},
 188   {BGPPEERMINASORIGINATIONINTERVAL, INTEGER, RWRITE, bgpPeerTable,
 189    3, {3, 1, 22}},
 190   {BGPPEERMINROUTEADVERTISEMENTINTERVAL, INTEGER, RWRITE, bgpPeerTable,
 191    3, {3, 1, 23}},
 192   {BGPPEERINUPDATEELAPSEDTIME, GAUGE32, RONLY, bgpPeerTable,
 193    3, {3, 1, 24}},
 194   /* BGP identifier. */
 195   {BGPIDENTIFIER,             IPADDRESS, RONLY, bgpIdentifier,
 196    1, {4}},
 197   /* BGP received path attribute table. */
 198   {BGPPATHATTRPEER,           IPADDRESS, RONLY, bgpRcvdPathAttrTable,
 199    3, {5, 1, 1}},
 200   {BGPPATHATTRDESTNETWORK,    IPADDRESS, RONLY, bgpRcvdPathAttrTable,
 201    3, {5, 1, 2}},
 202   {BGPPATHATTRORIGIN,         INTEGER, RONLY, bgpRcvdPathAttrTable,
 203    3, {5, 1, 3}},
 204   {BGPPATHATTRASPATH,         OCTET_STRING, RONLY, bgpRcvdPathAttrTable,
 205    3, {5, 1, 4}},
 206   {BGPPATHATTRNEXTHOP,        IPADDRESS, RONLY, bgpRcvdPathAttrTable,
 207    3, {5, 1, 5}},
 208   {BGPPATHATTRINTERASMETRIC,  INTEGER32, RONLY, bgpRcvdPathAttrTable,
 209    3, {5, 1, 6}},
 210   /* BGP-4 received path attribute table. */
 211   {BGP4PATHATTRPEER, IPADDRESS, RONLY, bgp4PathAttrTable,
 212    3, {6, 1, 1}},
 213   {BGP4PATHATTRIPADDRPREFIXLEN, INTEGER, RONLY, bgp4PathAttrTable,
 214    3, {6, 1, 2}},
 215   {BGP4PATHATTRIPADDRPREFIX,  IPADDRESS, RONLY, bgp4PathAttrTable,
 216    3, {6, 1, 3}},
 217   {BGP4PATHATTRORIGIN,        INTEGER, RONLY, bgp4PathAttrTable,
 218    3, {6, 1, 4}},
 219   {BGP4PATHATTRASPATHSEGMENT, OCTET_STRING, RONLY, bgp4PathAttrTable,
 220    3, {6, 1, 5}},
 221   {BGP4PATHATTRNEXTHOP,       IPADDRESS, RONLY, bgp4PathAttrTable,
 222    3, {6, 1, 6}},
 223   {BGP4PATHATTRMULTIEXITDISC, INTEGER, RONLY, bgp4PathAttrTable,
 224    3, {6, 1, 7}},
 225   {BGP4PATHATTRLOCALPREF,     INTEGER, RONLY, bgp4PathAttrTable,
 226    3, {6, 1, 8}},
 227   {BGP4PATHATTRATOMICAGGREGATE, INTEGER, RONLY, bgp4PathAttrTable,
 228    3, {6, 1, 9}},
 229   {BGP4PATHATTRAGGREGATORAS,  INTEGER, RONLY, bgp4PathAttrTable,
 230    3, {6, 1, 10}},
 231   {BGP4PATHATTRAGGREGATORADDR, IPADDRESS, RONLY, bgp4PathAttrTable,
 232    3, {6, 1, 11}},
 233   {BGP4PATHATTRCALCLOCALPREF, INTEGER, RONLY, bgp4PathAttrTable,
 234    3, {6, 1, 12}},
 235   {BGP4PATHATTRBEST,          INTEGER, RONLY, bgp4PathAttrTable,
 236    3, {6, 1, 13}},
 237   {BGP4PATHATTRUNKNOWN,       OCTET_STRING, RONLY, bgp4PathAttrTable,
 238    3, {6, 1, 14}},
 239 };
 240
 241 \f
 242 static u_char *
 243 bgpVersion (struct variable *v, oid name[], size_t *length, int exact,
 244             size_t *var_len, WriteMethod **write_method)
 245 {
 246   static u_char version;
 247
 248   if (smux_header_generic(v, name, length, exact, var_len, write_method)
 249       == MATCH_FAILED)
 250     return NULL;
 251
 252   /* Retrun BGP version.  Zebra bgpd only support version 4. */
 253   version = (0x80 >> (BGP_VERSION_4 - 1));
 254
 255   /* Return octet string length 1. */
 256   *var_len = 1;
 257   return (u_char *)&version;
 258 }
 259
 260 static u_char *
 261 bgpLocalAs (struct variable *v, oid name[], size_t *length,
 262             int exact, size_t *var_len, WriteMethod **write_method)
 263 {
 264   struct bgp *bgp;
 265
 266   if (smux_header_generic(v, name, length, exact, var_len, write_method)
 267       == MATCH_FAILED)
 268     return NULL;
 269
 270   /* Get BGP structure. */
 271   bgp = bgp_get_default ();
 272   if (! bgp)
 273     return NULL;
 274
 275   return SNMP_INTEGER (bgp->as);
 276 }
 277
 278 struct peer *
 279 peer_lookup_addr_ipv4 (struct in_addr *src)
 280 {
 281   struct bgp *bgp;
 282   struct peer *peer;
 283   struct listnode *node;
 284   struct in_addr addr;
 285   int ret;
 286
 287   bgp = bgp_get_default ();
 288   if (! bgp)
 289     return NULL;
 290
 291   for (ALL_LIST_ELEMENTS_RO (bgp->peer, node, peer))
 292     {
 293       ret = inet_pton (AF_INET, peer->host, &addr);
 294       if (ret > 0)
 295         {
 296           if (IPV4_ADDR_SAME (&addr, src))
 297             return peer;
 298         }
 299     }
 300   return NULL;
 301 }
 302
 303 struct peer *
 304 bgp_peer_lookup_next (struct in_addr *src)
 305 {
 306   struct bgp *bgp;
 307   struct peer *peer;
 308   struct listnode *node;
 309   struct in_addr *p;
 310   union sockunion su;
 311   int ret;
 312
 313   memset (&su, 0, sizeof (union sockunion));
 314
 315   bgp = bgp_get_default ();
 316   if (! bgp)
 317     return NULL;
 318
 319   for (ALL_LIST_ELEMENTS_RO (bgp->peer, node, peer))
 320     {
 321       ret = inet_pton (AF_INET, peer->host, &su.sin.sin_addr);
 322       if (ret > 0)
 323         {
 324           p = &su.sin.sin_addr;
 325
 326           if (ntohl (p->s_addr) > ntohl (src->s_addr))
 327             {
 328               src->s_addr = p->s_addr;
 329               return peer;
 330             }
 331         }
 332     }
 333   return NULL;
 334 }
 335
 336 struct peer *
 337 bgpPeerTable_lookup (struct variable *v, oid name[], size_t *length,
 338                      struct in_addr *addr, int exact)
 339 {
 340   struct peer *peer = NULL;
 341   int len;
 342
 343   if (exact)
 344     {
 345       /* Check the length. */
 346       if (*length - v->namelen != sizeof (struct in_addr))
 347         return NULL;
 348
 349       oid2in_addr (name + v->namelen, IN_ADDR_SIZE, addr);
 350
 351       peer = peer_lookup_addr_ipv4 (addr);
 352       return peer;
 353     }
 354   else
 355     {
 356       len = *length - v->namelen;
 357       if (len > 4) len = 4;
 358
 359       oid2in_addr (name + v->namelen, len, addr);
 360
 361       peer = bgp_peer_lookup_next (addr);
 362
 363       if (peer == NULL)
 364         return NULL;
 365
 366       oid_copy_addr (name + v->namelen, addr, sizeof (struct in_addr));
 367       *length = sizeof (struct in_addr) + v->namelen;
 368
 369       return peer;
 370     }
 371   return NULL;
 372 }
 373
 374 /* BGP write methods. */
 375 int
 376 write_bgpPeerTable (int action, u_char *var_val,
 377                     u_char var_val_type, size_t var_val_len,
 378                     u_char *statP, oid *name, size_t length,
 379                     struct variable *v)
 380 {
 381   struct in_addr addr;
 382   struct peer *peer;
 383   long intval;
 384   int bigsize = SNMP_MAX_LEN;
 385
 386   if (var_val_type != ASN_INTEGER)
 387     {
 388       return SNMP_ERR_WRONGTYPE;
 389     }
 390   if (var_val_len != sizeof (long))
 391     {
 392       return SNMP_ERR_WRONGLENGTH;
 393     }
 394
 395   if (! asn_parse_int(var_val, &bigsize, &var_val_type,
 396                       &intval, sizeof(long)))
 397     {
 398       return SNMP_ERR_WRONGENCODING;
 399     }
 400
 401   memset (&addr, 0, sizeof (struct in_addr));
 402
 403   peer = bgpPeerTable_lookup (v, name, &length, &addr, 1);
 404   if (! peer)
 405     return SNMP_ERR_NOSUCHNAME;
 406
 407   printf ("val: %ld\n", intval);
 408
 409   switch (v->magic)
 410     {
 411     case BGPPEERADMINSTATUS:
 412 #define BGP_PeerAdmin_stop  1
 413 #define BGP_PeerAdmin_start 2
 414       /* When the peer is established,   */
 415       if (intval == BGP_PeerAdmin_stop)
 416         BGP_EVENT_ADD (peer, BGP_Stop);
 417       else if (intval == BGP_PeerAdmin_start)
 418         ;                       /* Do nothing. */
 419       else
 420         return SNMP_ERR_NOSUCHNAME;
 421       break;
 422     case BGPPEERCONNECTRETRYINTERVAL:
 423       SET_FLAG (peer->config, PEER_CONFIG_CONNECT);
 424       peer->connect = intval;
 425       peer->v_connect = intval;
 426       break;
 427     case BGPPEERHOLDTIMECONFIGURED:
 428       SET_FLAG (peer->config, PEER_CONFIG_TIMER);
 429       peer->holdtime = intval;
 430       peer->v_holdtime = intval;
 431       break;
 432     case BGPPEERKEEPALIVECONFIGURED:
 433       SET_FLAG (peer->config, PEER_CONFIG_TIMER);
 434       peer->keepalive = intval;
 435       peer->v_keepalive = intval;
 436       break;
 437     case BGPPEERMINASORIGINATIONINTERVAL:
 438       peer->v_asorig = intval;
 439       break;
 440     case BGPPEERMINROUTEADVERTISEMENTINTERVAL:
 441       peer->v_routeadv = intval;
 442       break;
 443     }
 444   return SNMP_ERR_NOERROR;
 445 }
 446
 447 u_char *
 448 bgpPeerTable (struct variable *v, oid name[], size_t *length,
 449               int exact, size_t *var_len, WriteMethod **write_method)
 450 {
 451   static struct in_addr addr;
 452   struct peer *peer;
 453
 454   *write_method = 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 (time (NULL) - 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 BGPPEERMINASORIGINATIONINTERVAL:
 567       *write_method = write_bgpPeerTable;
 568       return SNMP_INTEGER (peer->v_asorig);
 569       break;
 570     case BGPPEERMINROUTEADVERTISEMENTINTERVAL:
 571       *write_method = write_bgpPeerTable;
 572       return SNMP_INTEGER (peer->v_routeadv);
 573       break;
 574     case BGPPEERINUPDATEELAPSEDTIME:
 575       if (peer->update_time == 0)
 576         return SNMP_INTEGER (0);
 577       else
 578         return SNMP_INTEGER (time (NULL) - peer->update_time);
 579       break;
 580     default:
 581       return NULL;
 582       break;
 583     }
 584   return NULL;
 585 }
 586
 587 u_char *
 588 bgpIdentifier (struct variable *v, oid name[], size_t *length,
 589                int exact, size_t *var_len, WriteMethod **write_method)
 590 {
 591   struct bgp *bgp;
 592
 593   if (smux_header_generic(v, name, length, exact, var_len, write_method)
 594       == MATCH_FAILED)
 595     return NULL;
 596
 597   bgp = bgp_get_default ();
 598   if (!bgp)
 599     return NULL;
 600
 601   return SNMP_IPADDRESS (bgp->router_id);
 602 }
 603
 604 u_char *
 605 bgpRcvdPathAttrTable (struct variable *v, oid name[], size_t *length,
 606                       int exact, size_t *var_len, WriteMethod **write_method)
 607 {
 608   /* Received Path Attribute Table.  This table contains, one entry
 609      per path to a network, path attributes received from all peers
 610      running BGP version 3 or less.  This table is obsolete, having
 611      been replaced in functionality with the bgp4PathAttrTable.  */
 612   return NULL;
 613 }
 614
 615 struct bgp_info *
 616 bgp4PathAttrLookup (struct variable *v, oid name[], size_t *length,
 617                     struct bgp *bgp, struct prefix_ipv4 *addr, int exact)
 618 {
 619   oid *offset;
 620   int offsetlen;
 621   struct bgp_info *binfo;
 622   struct bgp_info *min;
 623   struct bgp_node *rn;
 624   union sockunion su;
 625   unsigned int len;
 626   struct in_addr paddr;
 627
 628 #define BGP_PATHATTR_ENTRY_OFFSET \
 629           (IN_ADDR_SIZE + 1 + IN_ADDR_SIZE)
 630
 631   if (exact)
 632     {
 633       if (*length - v->namelen != BGP_PATHATTR_ENTRY_OFFSET)
 634         return NULL;
 635
 636       /* Set OID offset for prefix. */
 637       offset = name + v->namelen;
 638       oid2in_addr (offset, IN_ADDR_SIZE, &addr->prefix);
 639       offset += IN_ADDR_SIZE;
 640
 641       /* Prefix length. */
 642       addr->prefixlen = *offset;
 643       offset++;
 644
 645       /* Peer address. */
 646       su.sin.sin_family = AF_INET;
 647       oid2in_addr (offset, IN_ADDR_SIZE, &su.sin.sin_addr);
 648
 649       /* Lookup node. */
 650       rn = bgp_node_lookup (bgp->rib[AFI_IP][SAFI_UNICAST],
 651                               (struct prefix *) addr);
 652       if (rn)
 653         {
 654           bgp_unlock_node (rn);
 655
 656           for (binfo = rn->info; binfo; binfo = binfo->next)
 657             if (sockunion_same (&binfo->peer->su, &su))
 658               return binfo;
 659         }
 660     }
 661   else
 662     {
 663       offset = name + v->namelen;
 664       offsetlen = *length - v->namelen;
 665       len = offsetlen;
 666
 667       if (offsetlen == 0)
 668         rn = bgp_table_top (bgp->rib[AFI_IP][SAFI_UNICAST]);
 669       else
 670         {
 671           if (len > IN_ADDR_SIZE)
 672             len = IN_ADDR_SIZE;
 673
 674           oid2in_addr (offset, len, &addr->prefix);
 675
 676           offset += IN_ADDR_SIZE;
 677           offsetlen -= IN_ADDR_SIZE;
 678
 679           if (offsetlen > 0)
 680             addr->prefixlen = *offset;
 681           else
 682             addr->prefixlen = len * 8;
 683
 684           rn = bgp_node_get (bgp->rib[AFI_IP][SAFI_UNICAST],
 685                                (struct prefix *) addr);
 686
 687           offset++;
 688           offsetlen--;
 689         }
 690
 691       if (offsetlen > 0)
 692         {
 693           len = offsetlen;
 694           if (len > IN_ADDR_SIZE)
 695             len = IN_ADDR_SIZE;
 696
 697           oid2in_addr (offset, len, &paddr);
 698         }
 699       else
 700         paddr.s_addr = 0;
 701
 702       if (! rn)
 703         return NULL;
 704
 705       do
 706         {
 707           min = NULL;
 708
 709           for (binfo = rn->info; binfo; binfo = binfo->next)
 710             {
 711               if (binfo->peer->su.sin.sin_family == AF_INET
 712                   && ntohl (paddr.s_addr)
 713                   < ntohl (binfo->peer->su.sin.sin_addr.s_addr))
 714                 {
 715                   if (min)
 716                     {
 717                       if (ntohl (binfo->peer->su.sin.sin_addr.s_addr)
 718                           < ntohl (min->peer->su.sin.sin_addr.s_addr))
 719                         min = binfo;
 720                     }
 721                   else
 722                     min = binfo;
 723                 }
 724             }
 725
 726           if (min)
 727             {
 728               *length = v->namelen + BGP_PATHATTR_ENTRY_OFFSET;
 729
 730               offset = name + v->namelen;
 731               oid_copy_addr (offset, &rn->p.u.prefix4, IN_ADDR_SIZE);
 732               offset += IN_ADDR_SIZE;
 733               *offset = rn->p.prefixlen;
 734               offset++;
 735               oid_copy_addr (offset, &min->peer->su.sin.sin_addr,
 736                              IN_ADDR_SIZE);
 737               addr->prefix = rn->p.u.prefix4;
 738               addr->prefixlen = rn->p.prefixlen;
 739
 740               bgp_unlock_node (rn);
 741
 742               return min;
 743             }
 744
 745           paddr.s_addr = 0;
 746         }
 747       while ((rn = bgp_route_next (rn)) != NULL);
 748     }
 749   return NULL;
 750 }
 751
 752 u_char *
 753 bgp4PathAttrTable (struct variable *v, oid name[], size_t *length,
 754                    int exact, size_t *var_len, WriteMethod **write_method)
 755 {
 756   struct bgp *bgp;
 757   struct bgp_info *binfo;
 758   struct prefix_ipv4 addr;
 759
 760   bgp = bgp_get_default ();
 761   if (! bgp)
 762     return NULL;
 763
 764   memset (&addr, 0, sizeof (struct prefix_ipv4));
 765
 766   binfo = bgp4PathAttrLookup (v, name, length, bgp, &addr, exact);
 767   if (! binfo)
 768     return NULL;
 769
 770   switch (v->magic)
 771     {
 772     case BGP4PATHATTRPEER:      /* 1 */
 773       return SNMP_IPADDRESS (binfo->peer->su.sin.sin_addr);
 774       break;
 775     case BGP4PATHATTRIPADDRPREFIXLEN: /* 2 */
 776       return SNMP_INTEGER (addr.prefixlen);
 777       break;
 778     case BGP4PATHATTRIPADDRPREFIX: /* 3 */
 779       return SNMP_IPADDRESS (addr.prefix);
 780       break;
 781     case BGP4PATHATTRORIGIN:    /* 4 */
 782       return SNMP_INTEGER (binfo->attr->origin);
 783       break;
 784     case BGP4PATHATTRASPATHSEGMENT: /* 5 */
 785       return aspath_snmp_pathseg (binfo->attr->aspath, var_len);
 786       break;
 787     case BGP4PATHATTRNEXTHOP:   /* 6 */
 788       return SNMP_IPADDRESS (binfo->attr->nexthop);
 789       break;
 790     case BGP4PATHATTRMULTIEXITDISC: /* 7 */
 791       return SNMP_INTEGER (binfo->attr->med);
 792       break;
 793     case BGP4PATHATTRLOCALPREF: /* 8 */
 794       return SNMP_INTEGER (binfo->attr->local_pref);
 795       break;
 796     case BGP4PATHATTRATOMICAGGREGATE: /* 9 */
 797       return SNMP_INTEGER (1);
 798       break;
 799     case BGP4PATHATTRAGGREGATORAS: /* 10 */
 800       if (binfo->attr->extra)
 801         return SNMP_INTEGER (binfo->attr->extra->aggregator_as);
 802       else
 803         return SNMP_INTEGER (0);
 804       break;
 805     case BGP4PATHATTRAGGREGATORADDR: /* 11 */
 806       if (binfo->attr->extra)
 807         return SNMP_IPADDRESS (binfo->attr->extra->aggregator_addr);
 808       else
 809         return SNMP_INTEGER (0);
 810       break;
 811     case BGP4PATHATTRCALCLOCALPREF: /* 12 */
 812       return SNMP_INTEGER (-1);
 813       break;
 814     case BGP4PATHATTRBEST:      /* 13 */
 815 #define BGP4_PathAttrBest_false 1
 816 #define BGP4_PathAttrBest_true  2
 817       if (CHECK_FLAG (binfo->flags, BGP_INFO_SELECTED))
 818         return SNMP_INTEGER (BGP4_PathAttrBest_true);
 819       else
 820         return SNMP_INTEGER (BGP4_PathAttrBest_false);
 821       break;
 822     case BGP4PATHATTRUNKNOWN:   /* 14 */
 823       *var_len = 0;
 824       return NULL;
 825       break;
 826     }
 827   return NULL;
 828 }
 829 \f
 830 /* BGP Traps. */
 831 struct trap_object bgpTrapList[] =
 832 {
 833   {bgpPeerTable, 3, {3, 1, BGPPEERLASTERROR}},
 834   {bgpPeerTable, 3, {3, 1, BGPPEERSTATE}}
 835 };
 836
 837 void
 838 bgpTrapEstablished (struct peer *peer)
 839 {
 840   int ret;
 841   struct in_addr addr;
 842   oid index[sizeof (oid) * IN_ADDR_SIZE];
 843
 844   ret = inet_aton (peer->host, &addr);
 845   if (ret == 0)
 846     return;
 847
 848   oid_copy_addr (index, &addr, IN_ADDR_SIZE);
 849
 850   smux_trap (bgp_oid, sizeof bgp_oid / sizeof (oid),
 851              index, IN_ADDR_SIZE,
 852              bgpTrapList, sizeof bgpTrapList / sizeof (struct trap_object),
 853              bm->start_time - time (NULL), BGPESTABLISHED);
 854 }
 855
 856 void
 857 bgpTrapBackwardTransition (struct peer *peer)
 858 {
 859   int ret;
 860   struct in_addr addr;
 861   oid index[sizeof (oid) * IN_ADDR_SIZE];
 862
 863   ret = inet_aton (peer->host, &addr);
 864   if (ret == 0)
 865     return;
 866
 867   oid_copy_addr (index, &addr, IN_ADDR_SIZE);
 868
 869   smux_trap (bgp_oid, sizeof bgp_oid / sizeof (oid),
 870              index, IN_ADDR_SIZE,
 871              bgpTrapList, sizeof bgpTrapList / sizeof (struct trap_object),
 872              bm->start_time - time (NULL), BGPBACKWARDTRANSITION);
 873 }
 874
 875 void
 876 bgp_snmp_init ()
 877 {
 878   smux_init (bm->master);
 879   REGISTER_MIB("mibII/bgp", bgp_variables, variable, bgp_oid);
 880 }
 881 #endif /* HAVE_SNMP */