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 /* Zebra enterprise BGP MIB.  This variable is used for register
  53    OSPF MIB to SNMP agent under SMUX protocol.  */
  54 #define BGPDMIB 1,3,6,1,4,1,3317,1,2,2
  55
  56 /* BGP MIB bgpVersion. */
  57 #define BGPVERSION                            0
  58
  59 /* BGP MIB bgpLocalAs. */
  60 #define BGPLOCALAS                            0
  61
  62 /* BGP MIB bgpPeerTable. */
  63 #define BGPPEERIDENTIFIER                     1
  64 #define BGPPEERSTATE                          2
  65 #define BGPPEERADMINSTATUS                    3
  66 #define BGPPEERNEGOTIATEDVERSION              4
  67 #define BGPPEERLOCALADDR                      5
  68 #define BGPPEERLOCALPORT                      6
  69 #define BGPPEERREMOTEADDR                     7
  70 #define BGPPEERREMOTEPORT                     8
  71 #define BGPPEERREMOTEAS                       9
  72 #define BGPPEERINUPDATES                     10
  73 #define BGPPEEROUTUPDATES                    11
  74 #define BGPPEERINTOTALMESSAGES               12
  75 #define BGPPEEROUTTOTALMESSAGES              13
  76 #define BGPPEERLASTERROR                     14
  77 #define BGPPEERFSMESTABLISHEDTRANSITIONS     15
  78 #define BGPPEERFSMESTABLISHEDTIME            16
  79 #define BGPPEERCONNECTRETRYINTERVAL          17
  80 #define BGPPEERHOLDTIME                      18
  81 #define BGPPEERKEEPALIVE                     19
  82 #define BGPPEERHOLDTIMECONFIGURED            20
  83 #define BGPPEERKEEPALIVECONFIGURED           21
  84 #define BGPPEERMINASORIGINATIONINTERVAL      22
  85 #define BGPPEERMINROUTEADVERTISEMENTINTERVAL 23
  86 #define BGPPEERINUPDATEELAPSEDTIME           24
  87
  88 /* BGP MIB bgpIdentifier. */
  89 #define BGPIDENTIFIER                         0
  90
  91 /* BGP MIB bgpRcvdPathAttrTable */
  92 #define BGPPATHATTRPEER                       1
  93 #define BGPPATHATTRDESTNETWORK                2
  94 #define BGPPATHATTRORIGIN                     3
  95 #define BGPPATHATTRASPATH                     4
  96 #define BGPPATHATTRNEXTHOP                    5
  97 #define BGPPATHATTRINTERASMETRIC              6
  98
  99 /* BGP MIB bgp4PathAttrTable. */
 100 #define BGP4PATHATTRPEER                      1
 101 #define BGP4PATHATTRIPADDRPREFIXLEN           2
 102 #define BGP4PATHATTRIPADDRPREFIX              3
 103 #define BGP4PATHATTRORIGIN                    4
 104 #define BGP4PATHATTRASPATHSEGMENT             5
 105 #define BGP4PATHATTRNEXTHOP                   6
 106 #define BGP4PATHATTRMULTIEXITDISC             7
 107 #define BGP4PATHATTRLOCALPREF                 8
 108 #define BGP4PATHATTRATOMICAGGREGATE           9
 109 #define BGP4PATHATTRAGGREGATORAS             10
 110 #define BGP4PATHATTRAGGREGATORADDR           11
 111 #define BGP4PATHATTRCALCLOCALPREF            12
 112 #define BGP4PATHATTRBEST                     13
 113 #define BGP4PATHATTRUNKNOWN                  14
 114
 115 /* SNMP value hack. */
 116 #define INTEGER ASN_INTEGER
 117 #define INTEGER32 ASN_INTEGER
 118 #define COUNTER32 ASN_COUNTER
 119 #define OCTET_STRING ASN_OCTET_STR
 120 #define IPADDRESS ASN_IPADDRESS
 121 #define GAUGE32 ASN_UNSIGNED
 122 \f
 123 /* Declare static local variables for convenience. */
 124 SNMP_LOCAL_VARIABLES
 125
 126 /* BGP-MIB instances. */
 127 oid bgp_oid [] = { BGP4MIB };
 128 oid bgpd_oid [] = { BGPDMIB };
 129
 130 /* IP address 0.0.0.0. */
 131 static struct in_addr bgp_empty_addr = {0};
 132
 133 /* Hook functions. */
 134 static u_char *bgpVersion ();
 135 static u_char *bgpLocalAs ();
 136 static u_char *bgpPeerTable ();
 137 static u_char *bgpRcvdPathAttrTable ();
 138 static u_char *bgpIdentifier ();
 139 static u_char *bgp4PathAttrTable ();
 140 /* static u_char *bgpTraps (); */
 141
 142 struct variable bgp_variables[] =
 143 {
 144   /* BGP version. */
 145   {BGPVERSION,                OCTET_STRING, RONLY, bgpVersion,
 146    1, {1}},
 147   /* BGP local AS. */
 148   {BGPLOCALAS,                INTEGER, RONLY, bgpLocalAs,
 149    1, {2}},
 150   /* BGP peer table. */
 151   {BGPPEERIDENTIFIER,         IPADDRESS, RONLY, bgpPeerTable,
 152    3, {3, 1, 1}},
 153   {BGPPEERSTATE,              INTEGER, RONLY, bgpPeerTable,
 154    3, {3, 1, 2}},
 155   {BGPPEERADMINSTATUS,        INTEGER, RWRITE, bgpPeerTable,
 156    3, {3, 1, 3}},
 157   {BGPPEERNEGOTIATEDVERSION,  INTEGER32, RONLY, bgpPeerTable,
 158    3, {3, 1, 4}},
 159   {BGPPEERLOCALADDR,          IPADDRESS, RONLY, bgpPeerTable,
 160    3, {3, 1, 5}},
 161   {BGPPEERLOCALPORT,          INTEGER, RONLY, bgpPeerTable,
 162    3, {3, 1, 6}},
 163   {BGPPEERREMOTEADDR,         IPADDRESS, RONLY, bgpPeerTable,
 164    3, {3, 1, 7}},
 165   {BGPPEERREMOTEPORT,         INTEGER, RONLY, bgpPeerTable,
 166    3, {3, 1, 8}},
 167   {BGPPEERREMOTEAS,           INTEGER, RONLY, bgpPeerTable,
 168    3, {3, 1, 9}},
 169   {BGPPEERINUPDATES,          COUNTER32, RONLY, bgpPeerTable,
 170    3, {3, 1, 10}},
 171   {BGPPEEROUTUPDATES,         COUNTER32, RONLY, bgpPeerTable,
 172    3, {3, 1, 11}},
 173   {BGPPEERINTOTALMESSAGES,    COUNTER32, RONLY, bgpPeerTable,
 174    3, {3, 1, 12}},
 175   {BGPPEEROUTTOTALMESSAGES,   COUNTER32, RONLY, bgpPeerTable,
 176    3, {3, 1, 13}},
 177   {BGPPEERLASTERROR,          OCTET_STRING, RONLY, bgpPeerTable,
 178    3, {3, 1, 14}},
 179   {BGPPEERFSMESTABLISHEDTRANSITIONS, COUNTER32, RONLY, bgpPeerTable,
 180    3, {3, 1, 15}},
 181   {BGPPEERFSMESTABLISHEDTIME, GAUGE32, RONLY, bgpPeerTable,
 182    3, {3, 1, 16}},
 183   {BGPPEERCONNECTRETRYINTERVAL, INTEGER, RWRITE, bgpPeerTable,
 184    3, {3, 1, 17}},
 185   {BGPPEERHOLDTIME,           INTEGER, RONLY, bgpPeerTable,
 186    3, {3, 1, 18}},
 187   {BGPPEERKEEPALIVE,          INTEGER, RONLY, bgpPeerTable,
 188    3, {3, 1, 19}},
 189   {BGPPEERHOLDTIMECONFIGURED, INTEGER, RWRITE, bgpPeerTable,
 190    3, {3, 1, 20}},
 191   {BGPPEERKEEPALIVECONFIGURED, INTEGER, RWRITE, bgpPeerTable,
 192    3, {3, 1, 21}},
 193   {BGPPEERMINASORIGINATIONINTERVAL, INTEGER, RWRITE, bgpPeerTable,
 194    3, {3, 1, 22}},
 195   {BGPPEERMINROUTEADVERTISEMENTINTERVAL, INTEGER, RWRITE, bgpPeerTable,
 196    3, {3, 1, 23}},
 197   {BGPPEERINUPDATEELAPSEDTIME, GAUGE32, RONLY, bgpPeerTable,
 198    3, {3, 1, 24}},
 199   /* BGP identifier. */
 200   {BGPIDENTIFIER,             IPADDRESS, RONLY, bgpIdentifier,
 201    1, {4}},
 202   /* BGP received path attribute table. */
 203   {BGPPATHATTRPEER,           IPADDRESS, RONLY, bgpRcvdPathAttrTable,
 204    3, {5, 1, 1}},
 205   {BGPPATHATTRDESTNETWORK,    IPADDRESS, RONLY, bgpRcvdPathAttrTable,
 206    3, {5, 1, 2}},
 207   {BGPPATHATTRORIGIN,         INTEGER, RONLY, bgpRcvdPathAttrTable,
 208    3, {5, 1, 3}},
 209   {BGPPATHATTRASPATH,         OCTET_STRING, RONLY, bgpRcvdPathAttrTable,
 210    3, {5, 1, 4}},
 211   {BGPPATHATTRNEXTHOP,        IPADDRESS, RONLY, bgpRcvdPathAttrTable,
 212    3, {5, 1, 5}},
 213   {BGPPATHATTRINTERASMETRIC,  INTEGER32, RONLY, bgpRcvdPathAttrTable,
 214    3, {5, 1, 6}},
 215   /* BGP-4 received path attribute table. */
 216   {BGP4PATHATTRPEER, IPADDRESS, RONLY, bgp4PathAttrTable,
 217    3, {6, 1, 1}},
 218   {BGP4PATHATTRIPADDRPREFIXLEN, INTEGER, RONLY, bgp4PathAttrTable,
 219    3, {6, 1, 2}},
 220   {BGP4PATHATTRIPADDRPREFIX,  IPADDRESS, RONLY, bgp4PathAttrTable,
 221    3, {6, 1, 3}},
 222   {BGP4PATHATTRORIGIN,        INTEGER, RONLY, bgp4PathAttrTable,
 223    3, {6, 1, 4}},
 224   {BGP4PATHATTRASPATHSEGMENT, OCTET_STRING, RONLY, bgp4PathAttrTable,
 225    3, {6, 1, 5}},
 226   {BGP4PATHATTRNEXTHOP,       IPADDRESS, RONLY, bgp4PathAttrTable,
 227    3, {6, 1, 6}},
 228   {BGP4PATHATTRMULTIEXITDISC, INTEGER, RONLY, bgp4PathAttrTable,
 229    3, {6, 1, 7}},
 230   {BGP4PATHATTRLOCALPREF,     INTEGER, RONLY, bgp4PathAttrTable,
 231    3, {6, 1, 8}},
 232   {BGP4PATHATTRATOMICAGGREGATE, INTEGER, RONLY, bgp4PathAttrTable,
 233    3, {6, 1, 9}},
 234   {BGP4PATHATTRAGGREGATORAS,  INTEGER, RONLY, bgp4PathAttrTable,
 235    3, {6, 1, 10}},
 236   {BGP4PATHATTRAGGREGATORADDR, IPADDRESS, RONLY, bgp4PathAttrTable,
 237    3, {6, 1, 11}},
 238   {BGP4PATHATTRCALCLOCALPREF, INTEGER, RONLY, bgp4PathAttrTable,
 239    3, {6, 1, 12}},
 240   {BGP4PATHATTRBEST,          INTEGER, RONLY, bgp4PathAttrTable,
 241    3, {6, 1, 13}},
 242   {BGP4PATHATTRUNKNOWN,       OCTET_STRING, RONLY, bgp4PathAttrTable,
 243    3, {6, 1, 14}},
 244 };
 245
 246 \f
 247 static u_char *
 248 bgpVersion (struct variable *v, oid name[], size_t *length, int exact,
 249             size_t *var_len, WriteMethod **write_method)
 250 {
 251   static u_char version;
 252
 253   if (smux_header_generic(v, name, length, exact, var_len, write_method)
 254       == MATCH_FAILED)
 255     return NULL;
 256
 257   /* Retrun BGP version.  Zebra bgpd only support version 4. */
 258   version = (0x80 >> (BGP_VERSION_4 - 1));
 259
 260   /* Return octet string length 1. */
 261   *var_len = 1;
 262   return (u_char *)&version;
 263 }
 264
 265 static u_char *
 266 bgpLocalAs (struct variable *v, oid name[], size_t *length,
 267             int exact, size_t *var_len, WriteMethod **write_method)
 268 {
 269   struct bgp *bgp;
 270
 271   if (smux_header_generic(v, name, length, exact, var_len, write_method)
 272       == MATCH_FAILED)
 273     return NULL;
 274
 275   /* Get BGP structure. */
 276   bgp = bgp_get_default ();
 277   if (! bgp)
 278     return NULL;
 279
 280   return SNMP_INTEGER (bgp->as);
 281 }
 282
 283 struct peer *
 284 peer_lookup_addr_ipv4 (struct in_addr *src)
 285 {
 286   struct bgp *bgp;
 287   struct peer *peer;
 288   struct listnode *nn;
 289   struct in_addr addr;
 290   int ret;
 291
 292   bgp = bgp_get_default ();
 293   if (! bgp)
 294     return NULL;
 295
 296   LIST_LOOP (bgp->peer, peer, nn)
 297     {
 298       ret = inet_pton (AF_INET, peer->host, &addr);
 299       if (ret > 0)
 300         {
 301           if (IPV4_ADDR_SAME (&addr, src))
 302             return peer;
 303         }
 304     }
 305   return NULL;
 306 }
 307
 308 struct peer *
 309 bgp_peer_lookup_next (struct in_addr *src)
 310 {
 311   struct bgp *bgp;
 312   struct peer *peer;
 313   struct listnode *nn;
 314   struct in_addr *p;
 315   union sockunion su;
 316   int ret;
 317
 318   memset (&su, 0, sizeof (union sockunion));
 319
 320   bgp = bgp_get_default ();
 321   if (! bgp)
 322     return NULL;
 323
 324   LIST_LOOP (bgp->peer, peer, nn)
 325     {
 326       ret = inet_pton (AF_INET, peer->host, &su.sin.sin_addr);
 327       if (ret > 0)
 328         {
 329           p = &su.sin.sin_addr;
 330
 331           if (ntohl (p->s_addr) > ntohl (src->s_addr))
 332             {
 333               src->s_addr = p->s_addr;
 334               return peer;
 335             }
 336         }
 337     }
 338   return NULL;
 339 }
 340
 341 struct peer *
 342 bgpPeerTable_lookup (struct variable *v, oid name[], size_t *length,
 343                      struct in_addr *addr, int exact)
 344 {
 345   struct peer *peer = NULL;
 346   int len;
 347
 348   if (exact)
 349     {
 350       /* Check the length. */
 351       if (*length - v->namelen != sizeof (struct in_addr))
 352         return NULL;
 353
 354       oid2in_addr (name + v->namelen, IN_ADDR_SIZE, addr);
 355
 356       peer = peer_lookup_addr_ipv4 (addr);
 357       return peer;
 358     }
 359   else
 360     {
 361       len = *length - v->namelen;
 362       if (len > 4) len = 4;
 363
 364       oid2in_addr (name + v->namelen, len, addr);
 365
 366       peer = bgp_peer_lookup_next (addr);
 367
 368       if (peer == NULL)
 369         return NULL;
 370
 371       oid_copy_addr (name + v->namelen, addr, sizeof (struct in_addr));
 372       *length = sizeof (struct in_addr) + v->namelen;
 373
 374       return peer;
 375     }
 376   return NULL;
 377 }
 378
 379 /* BGP write methods. */
 380 int
 381 write_bgpPeerTable (int action, u_char *var_val,
 382                     u_char var_val_type, size_t var_val_len,
 383                     u_char *statP, oid *name, size_t length,
 384                     struct variable *v)
 385 {
 386   struct in_addr addr;
 387   struct peer *peer;
 388   long intval;
 389   int bigsize = SNMP_MAX_LEN;
 390
 391   if (var_val_type != ASN_INTEGER)
 392     {
 393       return SNMP_ERR_WRONGTYPE;
 394     }
 395   if (var_val_len != sizeof (long))
 396     {
 397       return SNMP_ERR_WRONGLENGTH;
 398     }
 399
 400   if (! asn_parse_int(var_val, &bigsize, &var_val_type,
 401                       &intval, sizeof(long)))
 402     {
 403       return SNMP_ERR_WRONGENCODING;
 404     }
 405
 406   memset (&addr, 0, sizeof (struct in_addr));
 407
 408   peer = bgpPeerTable_lookup (v, name, &length, &addr, 1);
 409   if (! peer)
 410     return SNMP_ERR_NOSUCHNAME;
 411
 412   printf ("val: %ld\n", intval);
 413
 414   switch (v->magic)
 415     {
 416     case BGPPEERADMINSTATUS:
 417 #define BGP_PeerAdmin_stop  1
 418 #define BGP_PeerAdmin_start 2
 419       /* When the peer is established,   */
 420       if (intval == BGP_PeerAdmin_stop)
 421         BGP_EVENT_ADD (peer, BGP_Stop);
 422       else if (intval == BGP_PeerAdmin_start)
 423         ;                       /* Do nothing. */
 424       else
 425         return SNMP_ERR_NOSUCHNAME;
 426       break;
 427     case BGPPEERCONNECTRETRYINTERVAL:
 428       SET_FLAG (peer->config, PEER_CONFIG_CONNECT);
 429       peer->connect = intval;
 430       peer->v_connect = intval;
 431       break;
 432     case BGPPEERHOLDTIMECONFIGURED:
 433       SET_FLAG (peer->config, PEER_CONFIG_TIMER);
 434       peer->holdtime = intval;
 435       peer->v_holdtime = intval;
 436       break;
 437     case BGPPEERKEEPALIVECONFIGURED:
 438       SET_FLAG (peer->config, PEER_CONFIG_TIMER);
 439       peer->keepalive = intval;
 440       peer->v_keepalive = intval;
 441       break;
 442     case BGPPEERMINASORIGINATIONINTERVAL:
 443       peer->v_asorig = intval;
 444       break;
 445     case BGPPEERMINROUTEADVERTISEMENTINTERVAL:
 446       peer->v_routeadv = intval;
 447       break;
 448     }
 449   return SNMP_ERR_NOERROR;
 450 }
 451
 452 u_char *
 453 bgpPeerTable (struct variable *v, oid name[], size_t *length,
 454               int exact, size_t *var_len, WriteMethod **write_method)
 455 {
 456   static struct in_addr addr;
 457   struct peer *peer;
 458
 459   *write_method = NULL;
 460   memset (&addr, 0, sizeof (struct in_addr));
 461
 462   peer = bgpPeerTable_lookup (v, name, length, &addr, exact);
 463   if (! peer)
 464     return NULL;
 465
 466   switch (v->magic)
 467     {
 468     case BGPPEERIDENTIFIER:
 469       return SNMP_IPADDRESS (peer->remote_id);
 470       break;
 471     case BGPPEERSTATE:
 472       return SNMP_INTEGER (peer->status);
 473       break;
 474     case BGPPEERADMINSTATUS:
 475       *write_method = write_bgpPeerTable;
 476 #define BGP_PeerAdmin_stop  1
 477 #define BGP_PeerAdmin_start 2
 478       if (CHECK_FLAG (peer->flags, PEER_FLAG_SHUTDOWN))
 479         return SNMP_INTEGER (BGP_PeerAdmin_stop);
 480       else
 481         return SNMP_INTEGER (BGP_PeerAdmin_start);
 482       break;
 483     case BGPPEERNEGOTIATEDVERSION:
 484       return SNMP_INTEGER (peer->version);
 485       break;
 486     case BGPPEERLOCALADDR:
 487       if (peer->su_local)
 488         return SNMP_IPADDRESS (peer->su_local->sin.sin_addr);
 489       else
 490         return SNMP_IPADDRESS (bgp_empty_addr);
 491       break;
 492     case BGPPEERLOCALPORT:
 493       if (peer->su_local)
 494         return SNMP_INTEGER (ntohs (peer->su_local->sin.sin_port));
 495       else
 496         return SNMP_INTEGER (0);
 497       break;
 498     case BGPPEERREMOTEADDR:
 499       if (peer->su_remote)
 500         return SNMP_IPADDRESS (peer->su_remote->sin.sin_addr);
 501       else
 502         return SNMP_IPADDRESS (bgp_empty_addr);
 503       break;
 504     case BGPPEERREMOTEPORT:
 505       if (peer->su_remote)
 506         return SNMP_INTEGER (ntohs (peer->su_remote->sin.sin_port));
 507       else
 508         return SNMP_INTEGER (0);
 509       break;
 510     case BGPPEERREMOTEAS:
 511       return SNMP_INTEGER (peer->as);
 512       break;
 513     case BGPPEERINUPDATES:
 514       return SNMP_INTEGER (peer->update_in);
 515       break;
 516     case BGPPEEROUTUPDATES:
 517       return SNMP_INTEGER (peer->update_out);
 518       break;
 519     case BGPPEERINTOTALMESSAGES:
 520       return SNMP_INTEGER (peer->open_in + peer->update_in
 521                            + peer->keepalive_in + peer->notify_in
 522                            + peer->refresh_in + peer->dynamic_cap_in);
 523       break;
 524     case BGPPEEROUTTOTALMESSAGES:
 525       return SNMP_INTEGER (peer->open_out + peer->update_out
 526                            + peer->keepalive_out + peer->notify_out
 527                            + peer->refresh_out + peer->dynamic_cap_out);
 528       break;
 529     case BGPPEERLASTERROR:
 530       {
 531         static u_char lasterror[2];
 532         lasterror[0] = peer->notify.code;
 533         lasterror[1] = peer->notify.subcode;
 534         *var_len = 2;
 535         return (u_char *)&lasterror;
 536       }
 537       break;
 538     case BGPPEERFSMESTABLISHEDTRANSITIONS:
 539       return SNMP_INTEGER (peer->established);
 540       break;
 541     case BGPPEERFSMESTABLISHEDTIME:
 542       if (peer->uptime == 0)
 543         return SNMP_INTEGER (0);
 544       else
 545         return SNMP_INTEGER (time (NULL) - peer->uptime);
 546       break;
 547     case BGPPEERCONNECTRETRYINTERVAL:
 548       *write_method = write_bgpPeerTable;
 549       return SNMP_INTEGER (peer->v_connect);
 550       break;
 551     case BGPPEERHOLDTIME:
 552       return SNMP_INTEGER (peer->v_holdtime);
 553       break;
 554     case BGPPEERKEEPALIVE:
 555       return SNMP_INTEGER (peer->v_keepalive);
 556       break;
 557     case BGPPEERHOLDTIMECONFIGURED:
 558       *write_method = write_bgpPeerTable;
 559       if (CHECK_FLAG (peer->config, PEER_CONFIG_TIMER))
 560         return SNMP_INTEGER (peer->holdtime);
 561       else
 562         return SNMP_INTEGER (peer->v_holdtime);
 563       break;
 564     case BGPPEERKEEPALIVECONFIGURED:
 565       *write_method = write_bgpPeerTable;
 566       if (CHECK_FLAG (peer->config, PEER_CONFIG_TIMER))
 567         return SNMP_INTEGER (peer->keepalive);
 568       else
 569         return SNMP_INTEGER (peer->v_keepalive);
 570       break;
 571     case BGPPEERMINASORIGINATIONINTERVAL:
 572       *write_method = write_bgpPeerTable;
 573       return SNMP_INTEGER (peer->v_asorig);
 574       break;
 575     case BGPPEERMINROUTEADVERTISEMENTINTERVAL:
 576       *write_method = write_bgpPeerTable;
 577       return SNMP_INTEGER (peer->v_routeadv);
 578       break;
 579     case BGPPEERINUPDATEELAPSEDTIME:
 580       if (peer->update_time == 0)
 581         return SNMP_INTEGER (0);
 582       else
 583         return SNMP_INTEGER (time (NULL) - peer->update_time);
 584       break;
 585     default:
 586       return NULL;
 587       break;
 588     }
 589   return NULL;
 590 }
 591
 592 u_char *
 593 bgpIdentifier (struct variable *v, oid name[], size_t *length,
 594                int exact, size_t *var_len, WriteMethod **write_method)
 595 {
 596   struct bgp *bgp;
 597
 598   if (smux_header_generic(v, name, length, exact, var_len, write_method)
 599       == MATCH_FAILED)
 600     return NULL;
 601
 602   bgp = bgp_get_default ();
 603   if (!bgp)
 604     return NULL;
 605
 606   return SNMP_IPADDRESS (bgp->router_id);
 607 }
 608
 609 u_char *
 610 bgpRcvdPathAttrTable (struct variable *v, oid name[], size_t *length,
 611                       int exact, size_t *var_len, WriteMethod **write_method)
 612 {
 613   /* Received Path Attribute Table.  This table contains, one entry
 614      per path to a network, path attributes received from all peers
 615      running BGP version 3 or less.  This table is obsolete, having
 616      been replaced in functionality with the bgp4PathAttrTable.  */
 617   return NULL;
 618 }
 619
 620 struct bgp_info *
 621 bgp4PathAttrLookup (struct variable *v, oid name[], size_t *length,
 622                     struct bgp *bgp, struct prefix_ipv4 *addr, int exact)
 623 {
 624   oid *offset;
 625   int offsetlen;
 626   struct bgp_info *binfo;
 627   struct bgp_info *min;
 628   struct bgp_node *rn;
 629   union sockunion su;
 630   int len;
 631   struct in_addr paddr;
 632
 633 #define BGP_PATHATTR_ENTRY_OFFSET \
 634           (IN_ADDR_SIZE + 1 + IN_ADDR_SIZE)
 635
 636   if (exact)
 637     {
 638       if (*length - v->namelen != BGP_PATHATTR_ENTRY_OFFSET)
 639         return NULL;
 640
 641       /* Set OID offset for prefix. */
 642       offset = name + v->namelen;
 643       oid2in_addr (offset, IN_ADDR_SIZE, &addr->prefix);
 644       offset += IN_ADDR_SIZE;
 645
 646       /* Prefix length. */
 647       addr->prefixlen = *offset;
 648       offset++;
 649
 650       /* Peer address. */
 651       su.sin.sin_family = AF_INET;
 652       oid2in_addr (offset, IN_ADDR_SIZE, &su.sin.sin_addr);
 653
 654       /* Lookup node. */
 655       rn = bgp_node_lookup (bgp->rib[AFI_IP][SAFI_UNICAST],
 656                               (struct prefix *) addr);
 657       if (rn)
 658         {
 659           bgp_unlock_node (rn);
 660
 661           for (binfo = rn->info; binfo; binfo = binfo->next)
 662             if (sockunion_same (&binfo->peer->su, &su))
 663               return binfo;
 664         }
 665     }
 666   else
 667     {
 668       offset = name + v->namelen;
 669       offsetlen = *length - v->namelen;
 670       len = offsetlen;
 671
 672       if (offsetlen == 0)
 673         rn = bgp_table_top (bgp->rib[AFI_IP][SAFI_UNICAST]);
 674       else
 675         {
 676           if (len > IN_ADDR_SIZE)
 677             len = IN_ADDR_SIZE;
 678
 679           oid2in_addr (offset, len, &addr->prefix);
 680
 681           offset += IN_ADDR_SIZE;
 682           offsetlen -= IN_ADDR_SIZE;
 683
 684           if (offsetlen > 0)
 685             addr->prefixlen = *offset;
 686           else
 687             addr->prefixlen = len * 8;
 688
 689           rn = bgp_node_get (bgp->rib[AFI_IP][SAFI_UNICAST],
 690                                (struct prefix *) addr);
 691
 692           offset++;
 693           offsetlen--;
 694         }
 695
 696       if (offsetlen > 0)
 697         {
 698           len = offsetlen;
 699           if (len > IN_ADDR_SIZE)
 700             len = IN_ADDR_SIZE;
 701
 702           oid2in_addr (offset, len, &paddr);
 703         }
 704       else
 705         paddr.s_addr = 0;
 706
 707       if (! rn)
 708         return NULL;
 709
 710       do
 711         {
 712           min = NULL;
 713
 714           for (binfo = rn->info; binfo; binfo = binfo->next)
 715             {
 716               if (binfo->peer->su.sin.sin_family == AF_INET
 717                   && ntohl (paddr.s_addr)
 718                   < ntohl (binfo->peer->su.sin.sin_addr.s_addr))
 719                 {
 720                   if (min)
 721                     {
 722                       if (ntohl (binfo->peer->su.sin.sin_addr.s_addr)
 723                           < ntohl (min->peer->su.sin.sin_addr.s_addr))
 724                         min = binfo;
 725                     }
 726                   else
 727                     min = binfo;
 728                 }
 729             }
 730
 731           if (min)
 732             {
 733               *length = v->namelen + BGP_PATHATTR_ENTRY_OFFSET;
 734
 735               offset = name + v->namelen;
 736               oid_copy_addr (offset, &rn->p.u.prefix4, IN_ADDR_SIZE);
 737               offset += IN_ADDR_SIZE;
 738               *offset = rn->p.prefixlen;
 739               offset++;
 740               oid_copy_addr (offset, &min->peer->su.sin.sin_addr,
 741                              IN_ADDR_SIZE);
 742               addr->prefix = rn->p.u.prefix4;
 743               addr->prefixlen = rn->p.prefixlen;
 744
 745               bgp_unlock_node (rn);
 746
 747               return min;
 748             }
 749
 750           paddr.s_addr = 0;
 751         }
 752       while ((rn = bgp_route_next (rn)) != NULL);
 753     }
 754   return NULL;
 755 }
 756
 757 u_char *
 758 bgp4PathAttrTable (struct variable *v, oid name[], size_t *length,
 759                    int exact, size_t *var_len, WriteMethod **write_method)
 760 {
 761   struct bgp *bgp;
 762   struct bgp_info *binfo;
 763   struct prefix_ipv4 addr;
 764
 765   bgp = bgp_get_default ();
 766   if (! bgp)
 767     return NULL;
 768
 769   memset (&addr, 0, sizeof (struct prefix_ipv4));
 770
 771   binfo = bgp4PathAttrLookup (v, name, length, bgp, &addr, exact);
 772   if (! binfo)
 773     return NULL;
 774
 775   switch (v->magic)
 776     {
 777     case BGP4PATHATTRPEER:      /* 1 */
 778       return SNMP_IPADDRESS (binfo->peer->su.sin.sin_addr);
 779       break;
 780     case BGP4PATHATTRIPADDRPREFIXLEN: /* 2 */
 781       return SNMP_INTEGER (addr.prefixlen);
 782       break;
 783     case BGP4PATHATTRIPADDRPREFIX: /* 3 */
 784       return SNMP_IPADDRESS (addr.prefix);
 785       break;
 786     case BGP4PATHATTRORIGIN:    /* 4 */
 787       return SNMP_INTEGER (binfo->attr->origin);
 788       break;
 789     case BGP4PATHATTRASPATHSEGMENT: /* 5 */
 790       *var_len = binfo->attr->aspath->length;
 791       return (u_char *) binfo->attr->aspath->data;
 792       break;
 793     case BGP4PATHATTRNEXTHOP:   /* 6 */
 794       return SNMP_IPADDRESS (binfo->attr->nexthop);
 795       break;
 796     case BGP4PATHATTRMULTIEXITDISC: /* 7 */
 797       return SNMP_INTEGER (binfo->attr->med);
 798       break;
 799     case BGP4PATHATTRLOCALPREF: /* 8 */
 800       return SNMP_INTEGER (binfo->attr->local_pref);
 801       break;
 802     case BGP4PATHATTRATOMICAGGREGATE: /* 9 */
 803       return SNMP_INTEGER (1);
 804       break;
 805     case BGP4PATHATTRAGGREGATORAS: /* 10 */
 806       return SNMP_INTEGER (binfo->attr->aggregator_as);
 807       break;
 808     case BGP4PATHATTRAGGREGATORADDR: /* 11 */
 809       return SNMP_IPADDRESS (binfo->attr->aggregator_addr);
 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   struct bgp_master *bm;
 879
 880   if ( !(bm = bgp_get_master ()) )
 881     return;
 882
 883   smux_init (bm->master, bgpd_oid, sizeof bgpd_oid / sizeof (oid));
 884   REGISTER_MIB("mibII/bgp", bgp_variables, variable, bgp_oid);
 885   smux_start ();
 886 }
 887 #endif /* HAVE_SNMP */