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 along
  17  * with this program; see the file COPYING; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  19  */
  20
  21 #include <zebra.h>
  22
  23 #include <net-snmp/net-snmp-config.h>
  24 #include <net-snmp/net-snmp-includes.h>
  25
  26 #include "if.h"
  27 #include "log.h"
  28 #include "prefix.h"
  29 #include "command.h"
  30 #include "thread.h"
  31 #include "smux.h"
  32 #include "filter.h"
  33 #include "hook.h"
  34 #include "libfrr.h"
  35 #include "version.h"
  36
  37 #include "bgpd/bgpd.h"
  38 #include "bgpd/bgp_table.h"
  39 #include "bgpd/bgp_aspath.h"
  40 #include "bgpd/bgp_attr.h"
  41 #include "bgpd/bgp_route.h"
  42 #include "bgpd/bgp_fsm.h"
  43
  44 /* BGP4-MIB described in RFC1657. */
  45 #define BGP4MIB 1,3,6,1,2,1,15
  46
  47 /* BGP TRAP. */
  48 #define BGPESTABLISHED                  1
  49 #define BGPBACKWARDTRANSITION           2
  50
  51 /* BGP MIB bgpVersion. */
  52 #define BGPVERSION                            0
  53
  54 /* BGP MIB bgpLocalAs. */
  55 #define BGPLOCALAS                            0
  56
  57 /* BGP MIB bgpPeerTable. */
  58 #define BGPPEERIDENTIFIER                     1
  59 #define BGPPEERSTATE                          2
  60 #define BGPPEERADMINSTATUS                    3
  61 #define BGPPEERNEGOTIATEDVERSION              4
  62 #define BGPPEERLOCALADDR                      5
  63 #define BGPPEERLOCALPORT                      6
  64 #define BGPPEERREMOTEADDR                     7
  65 #define BGPPEERREMOTEPORT                     8
  66 #define BGPPEERREMOTEAS                       9
  67 #define BGPPEERINUPDATES                     10
  68 #define BGPPEEROUTUPDATES                    11
  69 #define BGPPEERINTOTALMESSAGES               12
  70 #define BGPPEEROUTTOTALMESSAGES              13
  71 #define BGPPEERLASTERROR                     14
  72 #define BGPPEERFSMESTABLISHEDTRANSITIONS     15
  73 #define BGPPEERFSMESTABLISHEDTIME            16
  74 #define BGPPEERCONNECTRETRYINTERVAL          17
  75 #define BGPPEERHOLDTIME                      18
  76 #define BGPPEERKEEPALIVE                     19
  77 #define BGPPEERHOLDTIMECONFIGURED            20
  78 #define BGPPEERKEEPALIVECONFIGURED           21
  79 #define BGPPEERMINROUTEADVERTISEMENTINTERVAL 22
  80 #define BGPPEERINUPDATEELAPSEDTIME           23
  81
  82 /* BGP MIB bgpIdentifier. */
  83 #define BGPIDENTIFIER                         0
  84
  85 /* BGP MIB bgpRcvdPathAttrTable */
  86 #define BGPPATHATTRPEER                       1
  87 #define BGPPATHATTRDESTNETWORK                2
  88 #define BGPPATHATTRORIGIN                     3
  89 #define BGPPATHATTRASPATH                     4
  90 #define BGPPATHATTRNEXTHOP                    5
  91 #define BGPPATHATTRINTERASMETRIC              6
  92
  93 /* BGP MIB bgp4PathAttrTable. */
  94 #define BGP4PATHATTRPEER                      1
  95 #define BGP4PATHATTRIPADDRPREFIXLEN           2
  96 #define BGP4PATHATTRIPADDRPREFIX              3
  97 #define BGP4PATHATTRORIGIN                    4
  98 #define BGP4PATHATTRASPATHSEGMENT             5
  99 #define BGP4PATHATTRNEXTHOP                   6
 100 #define BGP4PATHATTRMULTIEXITDISC             7
 101 #define BGP4PATHATTRLOCALPREF                 8
 102 #define BGP4PATHATTRATOMICAGGREGATE           9
 103 #define BGP4PATHATTRAGGREGATORAS             10
 104 #define BGP4PATHATTRAGGREGATORADDR           11
 105 #define BGP4PATHATTRCALCLOCALPREF            12
 106 #define BGP4PATHATTRBEST                     13
 107 #define BGP4PATHATTRUNKNOWN                  14
 108
 109 /* SNMP value hack. */
 110 #define INTEGER ASN_INTEGER
 111 #define INTEGER32 ASN_INTEGER
 112 #define COUNTER32 ASN_COUNTER
 113 #define OCTET_STRING ASN_OCTET_STR
 114 #define IPADDRESS ASN_IPADDRESS
 115 #define GAUGE32 ASN_UNSIGNED
 116
 117 /* Declare static local variables for convenience. */
 118 SNMP_LOCAL_VARIABLES
 119
 120 /* BGP-MIB instances. */
 121 static oid bgp_oid[] = {BGP4MIB};
 122 static oid bgp_trap_oid[] = {BGP4MIB, 0};
 123
 124 /* IP address 0.0.0.0. */
 125 static struct in_addr bgp_empty_addr = {.s_addr = 0};
 126
 127 /* Hook functions. */
 128 static uint8_t *bgpVersion(struct variable *, oid[], size_t *, int, size_t *,
 129                            WriteMethod **);
 130 static uint8_t *bgpLocalAs(struct variable *, oid[], size_t *, int, size_t *,
 131                            WriteMethod **);
 132 static uint8_t *bgpPeerTable(struct variable *, oid[], size_t *, int, size_t *,
 133                              WriteMethod **);
 134 static uint8_t *bgpRcvdPathAttrTable(struct variable *, oid[], size_t *, int,
 135                                      size_t *, WriteMethod **);
 136 static uint8_t *bgpIdentifier(struct variable *, oid[], size_t *, int, size_t *,
 137                               WriteMethod **);
 138 static uint8_t *bgp4PathAttrTable(struct variable *, oid[], size_t *, int,
 139                                   size_t *, WriteMethod **);
 140 /* static uint8_t *bgpTraps (); */
 141
 142 static struct variable bgp_variables[] = {
 143         /* BGP version. */
 144         {BGPVERSION, OCTET_STRING, RONLY, bgpVersion, 1, {1}},
 145         /* BGP local AS. */
 146         {BGPLOCALAS, INTEGER, RONLY, bgpLocalAs, 1, {2}},
 147         /* BGP peer table. */
 148         {BGPPEERIDENTIFIER, IPADDRESS, RONLY, bgpPeerTable, 3, {3, 1, 1}},
 149         {BGPPEERSTATE, INTEGER, RONLY, bgpPeerTable, 3, {3, 1, 2}},
 150         {BGPPEERADMINSTATUS, INTEGER, RWRITE, bgpPeerTable, 3, {3, 1, 3}},
 151         {BGPPEERNEGOTIATEDVERSION,
 152          INTEGER32,
 153          RONLY,
 154          bgpPeerTable,
 155          3,
 156          {3, 1, 4}},
 157         {BGPPEERLOCALADDR, IPADDRESS, RONLY, bgpPeerTable, 3, {3, 1, 5}},
 158         {BGPPEERLOCALPORT, INTEGER, RONLY, bgpPeerTable, 3, {3, 1, 6}},
 159         {BGPPEERREMOTEADDR, IPADDRESS, RONLY, bgpPeerTable, 3, {3, 1, 7}},
 160         {BGPPEERREMOTEPORT, INTEGER, RONLY, bgpPeerTable, 3, {3, 1, 8}},
 161         {BGPPEERREMOTEAS, INTEGER, RONLY, bgpPeerTable, 3, {3, 1, 9}},
 162         {BGPPEERINUPDATES, COUNTER32, RONLY, bgpPeerTable, 3, {3, 1, 10}},
 163         {BGPPEEROUTUPDATES, COUNTER32, RONLY, bgpPeerTable, 3, {3, 1, 11}},
 164         {BGPPEERINTOTALMESSAGES, COUNTER32, RONLY, bgpPeerTable, 3, {3, 1, 12}},
 165         {BGPPEEROUTTOTALMESSAGES,
 166          COUNTER32,
 167          RONLY,
 168          bgpPeerTable,
 169          3,
 170          {3, 1, 13}},
 171         {BGPPEERLASTERROR, OCTET_STRING, RONLY, bgpPeerTable, 3, {3, 1, 14}},
 172         {BGPPEERFSMESTABLISHEDTRANSITIONS,
 173          COUNTER32,
 174          RONLY,
 175          bgpPeerTable,
 176          3,
 177          {3, 1, 15}},
 178         {BGPPEERFSMESTABLISHEDTIME,
 179          GAUGE32,
 180          RONLY,
 181          bgpPeerTable,
 182          3,
 183          {3, 1, 16}},
 184         {BGPPEERCONNECTRETRYINTERVAL,
 185          INTEGER,
 186          RWRITE,
 187          bgpPeerTable,
 188          3,
 189          {3, 1, 17}},
 190         {BGPPEERHOLDTIME, INTEGER, RONLY, bgpPeerTable, 3, {3, 1, 18}},
 191         {BGPPEERKEEPALIVE, INTEGER, RONLY, bgpPeerTable, 3, {3, 1, 19}},
 192         {BGPPEERHOLDTIMECONFIGURED,
 193          INTEGER,
 194          RWRITE,
 195          bgpPeerTable,
 196          3,
 197          {3, 1, 20}},
 198         {BGPPEERKEEPALIVECONFIGURED,
 199          INTEGER,
 200          RWRITE,
 201          bgpPeerTable,
 202          3,
 203          {3, 1, 21}},
 204         {BGPPEERMINROUTEADVERTISEMENTINTERVAL,
 205          INTEGER,
 206          RWRITE,
 207          bgpPeerTable,
 208          3,
 209          {3, 1, 23}},
 210         {BGPPEERINUPDATEELAPSEDTIME,
 211          GAUGE32,
 212          RONLY,
 213          bgpPeerTable,
 214          3,
 215          {3, 1, 24}},
 216         /* BGP identifier. */
 217         {BGPIDENTIFIER, IPADDRESS, RONLY, bgpIdentifier, 1, {4}},
 218         /* BGP received path attribute table. */
 219         {BGPPATHATTRPEER, IPADDRESS, RONLY, bgpRcvdPathAttrTable, 3, {5, 1, 1}},
 220         {BGPPATHATTRDESTNETWORK,
 221          IPADDRESS,
 222          RONLY,
 223          bgpRcvdPathAttrTable,
 224          3,
 225          {5, 1, 2}},
 226         {BGPPATHATTRORIGIN, INTEGER, RONLY, bgpRcvdPathAttrTable, 3, {5, 1, 3}},
 227         {BGPPATHATTRASPATH,
 228          OCTET_STRING,
 229          RONLY,
 230          bgpRcvdPathAttrTable,
 231          3,
 232          {5, 1, 4}},
 233         {BGPPATHATTRNEXTHOP,
 234          IPADDRESS,
 235          RONLY,
 236          bgpRcvdPathAttrTable,
 237          3,
 238          {5, 1, 5}},
 239         {BGPPATHATTRINTERASMETRIC,
 240          INTEGER32,
 241          RONLY,
 242          bgpRcvdPathAttrTable,
 243          3,
 244          {5, 1, 6}},
 245         /* BGP-4 received path attribute table. */
 246         {BGP4PATHATTRPEER, IPADDRESS, RONLY, bgp4PathAttrTable, 3, {6, 1, 1}},
 247         {BGP4PATHATTRIPADDRPREFIXLEN,
 248          INTEGER,
 249          RONLY,
 250          bgp4PathAttrTable,
 251          3,
 252          {6, 1, 2}},
 253         {BGP4PATHATTRIPADDRPREFIX,
 254          IPADDRESS,
 255          RONLY,
 256          bgp4PathAttrTable,
 257          3,
 258          {6, 1, 3}},
 259         {BGP4PATHATTRORIGIN, INTEGER, RONLY, bgp4PathAttrTable, 3, {6, 1, 4}},
 260         {BGP4PATHATTRASPATHSEGMENT,
 261          OCTET_STRING,
 262          RONLY,
 263          bgp4PathAttrTable,
 264          3,
 265          {6, 1, 5}},
 266         {BGP4PATHATTRNEXTHOP,
 267          IPADDRESS,
 268          RONLY,
 269          bgp4PathAttrTable,
 270          3,
 271          {6, 1, 6}},
 272         {BGP4PATHATTRMULTIEXITDISC,
 273          INTEGER,
 274          RONLY,
 275          bgp4PathAttrTable,
 276          3,
 277          {6, 1, 7}},
 278         {BGP4PATHATTRLOCALPREF,
 279          INTEGER,
 280          RONLY,
 281          bgp4PathAttrTable,
 282          3,
 283          {6, 1, 8}},
 284         {BGP4PATHATTRATOMICAGGREGATE,
 285          INTEGER,
 286          RONLY,
 287          bgp4PathAttrTable,
 288          3,
 289          {6, 1, 9}},
 290         {BGP4PATHATTRAGGREGATORAS,
 291          INTEGER,
 292          RONLY,
 293          bgp4PathAttrTable,
 294          3,
 295          {6, 1, 10}},
 296         {BGP4PATHATTRAGGREGATORADDR,
 297          IPADDRESS,
 298          RONLY,
 299          bgp4PathAttrTable,
 300          3,
 301          {6, 1, 11}},
 302         {BGP4PATHATTRCALCLOCALPREF,
 303          INTEGER,
 304          RONLY,
 305          bgp4PathAttrTable,
 306          3,
 307          {6, 1, 12}},
 308         {BGP4PATHATTRBEST, INTEGER, RONLY, bgp4PathAttrTable, 3, {6, 1, 13}},
 309         {BGP4PATHATTRUNKNOWN,
 310          OCTET_STRING,
 311          RONLY,
 312          bgp4PathAttrTable,
 313          3,
 314          {6, 1, 14}},
 315 };
 316
 317
 318 static uint8_t *bgpVersion(struct variable *v, oid name[], size_t *length,
 319                            int exact, size_t *var_len,
 320                            WriteMethod **write_method)
 321 {
 322         static uint8_t version;
 323
 324         if (smux_header_generic(v, name, length, exact, var_len, write_method)
 325             == MATCH_FAILED)
 326                 return NULL;
 327
 328         /* Retrun BGP version.  Zebra bgpd only support version 4. */
 329         version = (0x80 >> (BGP_VERSION_4 - 1));
 330
 331         /* Return octet string length 1. */
 332         *var_len = 1;
 333         return (uint8_t *)&version;
 334 }
 335
 336 static uint8_t *bgpLocalAs(struct variable *v, oid name[], size_t *length,
 337                            int exact, size_t *var_len,
 338                            WriteMethod **write_method)
 339 {
 340         struct bgp *bgp;
 341
 342         if (smux_header_generic(v, name, length, exact, var_len, write_method)
 343             == MATCH_FAILED)
 344                 return NULL;
 345
 346         /* Get BGP structure. */
 347         bgp = bgp_get_default();
 348         if (!bgp)
 349                 return NULL;
 350
 351         return SNMP_INTEGER(bgp->as);
 352 }
 353
 354 static struct peer *peer_lookup_addr_ipv4(struct in_addr *src)
 355 {
 356         struct bgp *bgp;
 357         struct peer *peer;
 358         struct listnode *node;
 359
 360         bgp = bgp_get_default();
 361         if (!bgp)
 362                 return NULL;
 363
 364         for (ALL_LIST_ELEMENTS_RO(bgp->peer, node, peer)) {
 365                 if (sockunion_family(&peer->su) != AF_INET)
 366                         continue;
 367
 368                 if (sockunion2ip(&peer->su) == src->s_addr)
 369                         return peer;
 370         }
 371
 372         return NULL;
 373 }
 374
 375 static struct peer *bgp_peer_lookup_next(struct in_addr *src)
 376 {
 377         struct bgp *bgp;
 378         struct peer *peer;
 379         struct peer *next_peer = NULL;
 380         struct listnode *node;
 381
 382         bgp = bgp_get_default();
 383         if (!bgp)
 384                 return NULL;
 385
 386         for (ALL_LIST_ELEMENTS_RO(bgp->peer, node, peer)) {
 387                 if (sockunion_family(&peer->su) != AF_INET)
 388                         continue;
 389                 if (ntohl(sockunion2ip(&peer->su)) <= ntohl(src->s_addr))
 390                         continue;
 391
 392                 if (!next_peer
 393                     || ntohl(sockunion2ip(&next_peer->su))
 394                                > ntohl(sockunion2ip(&peer->su))) {
 395                         next_peer = peer;
 396                 }
 397         }
 398
 399         if (next_peer) {
 400                 src->s_addr = sockunion2ip(&next_peer->su);
 401                 return next_peer;
 402         }
 403
 404         return NULL;
 405 }
 406
 407 /* 1.3.6.1.2.1.15.3.1.x  = 10 */
 408 #define PEERTAB_NAMELEN 10
 409
 410 static struct peer *bgpPeerTable_lookup(struct variable *v, oid name[],
 411                                         size_t *length, struct in_addr *addr,
 412                                         int exact)
 413 {
 414         struct peer *peer = NULL;
 415         size_t namelen = v ? v->namelen : PEERTAB_NAMELEN;
 416         int len;
 417
 418         if (exact) {
 419                 /* Check the length. */
 420                 if (*length - namelen != sizeof(struct in_addr))
 421                         return NULL;
 422
 423                 oid2in_addr(name + namelen, IN_ADDR_SIZE, addr);
 424
 425                 peer = peer_lookup_addr_ipv4(addr);
 426                 return peer;
 427         } else {
 428                 len = *length - namelen;
 429                 if (len > 4)
 430                         len = 4;
 431
 432                 oid2in_addr(name + namelen, len, addr);
 433
 434                 peer = bgp_peer_lookup_next(addr);
 435
 436                 if (peer == NULL)
 437                         return NULL;
 438
 439                 oid_copy_addr(name + namelen, addr, sizeof(struct in_addr));
 440                 *length = sizeof(struct in_addr) + namelen;
 441
 442                 return peer;
 443         }
 444         return NULL;
 445 }
 446
 447 /* BGP write methods. */
 448 static int write_bgpPeerTable(int action, uint8_t *var_val,
 449                               uint8_t var_val_type, size_t var_val_len,
 450                               uint8_t *statP, oid *name, size_t length)
 451 {
 452         struct in_addr addr;
 453         struct peer *peer;
 454         long intval;
 455
 456         if (var_val_type != ASN_INTEGER) {
 457                 return SNMP_ERR_WRONGTYPE;
 458         }
 459         if (var_val_len != sizeof(long)) {
 460                 return SNMP_ERR_WRONGLENGTH;
 461         }
 462
 463         intval = *(long *)var_val;
 464
 465         memset(&addr, 0, sizeof(struct in_addr));
 466
 467         peer = bgpPeerTable_lookup(NULL, name, &length, &addr, 1);
 468         if (!peer)
 469                 return SNMP_ERR_NOSUCHNAME;
 470
 471         if (action != SNMP_MSG_INTERNAL_SET_COMMIT)
 472                 return SNMP_ERR_NOERROR;
 473
 474         zlog_info("%s: SNMP write .%ld = %ld", peer->host,
 475                   (long)name[PEERTAB_NAMELEN - 1], intval);
 476
 477         switch (name[PEERTAB_NAMELEN - 1]) {
 478         case BGPPEERADMINSTATUS:
 479 #define BGP_PeerAdmin_stop  1
 480 #define BGP_PeerAdmin_start 2
 481                 /* When the peer is established,   */
 482                 if (intval == BGP_PeerAdmin_stop)
 483                         BGP_EVENT_ADD(peer, BGP_Stop);
 484                 else if (intval == BGP_PeerAdmin_start)
 485                         ; /* Do nothing. */
 486                 else
 487                         return SNMP_ERR_NOSUCHNAME;
 488                 break;
 489         case BGPPEERCONNECTRETRYINTERVAL:
 490                 peer_flag_set(peer, PEER_FLAG_TIMER_CONNECT);
 491                 peer->connect = intval;
 492                 peer->v_connect = intval;
 493                 break;
 494         case BGPPEERHOLDTIMECONFIGURED:
 495                 peer_flag_set(peer, PEER_FLAG_TIMER);
 496                 peer->holdtime = intval;
 497                 peer->v_holdtime = intval;
 498                 break;
 499         case BGPPEERKEEPALIVECONFIGURED:
 500                 peer_flag_set(peer, PEER_FLAG_TIMER);
 501                 peer->keepalive = intval;
 502                 peer->v_keepalive = intval;
 503                 break;
 504         case BGPPEERMINROUTEADVERTISEMENTINTERVAL:
 505                 peer->v_routeadv = intval;
 506                 break;
 507         }
 508         return SNMP_ERR_NOERROR;
 509 }
 510
 511 static uint8_t *bgpPeerTable(struct variable *v, oid name[], size_t *length,
 512                              int exact, size_t *var_len,
 513                              WriteMethod **write_method)
 514 {
 515         static struct in_addr addr;
 516         struct peer *peer;
 517         uint32_t ui, uo;
 518
 519         if (smux_header_table(v, name, length, exact, var_len, write_method)
 520             == MATCH_FAILED)
 521                 return NULL;
 522         memset(&addr, 0, sizeof(struct in_addr));
 523
 524         peer = bgpPeerTable_lookup(v, name, length, &addr, exact);
 525         if (!peer)
 526                 return NULL;
 527
 528         switch (v->magic) {
 529         case BGPPEERIDENTIFIER:
 530                 return SNMP_IPADDRESS(peer->remote_id);
 531                 break;
 532         case BGPPEERSTATE:
 533                 return SNMP_INTEGER(peer->status);
 534                 break;
 535         case BGPPEERADMINSTATUS:
 536                 *write_method = write_bgpPeerTable;
 537 #define BGP_PeerAdmin_stop  1
 538 #define BGP_PeerAdmin_start 2
 539                 if (CHECK_FLAG(peer->flags, PEER_FLAG_SHUTDOWN))
 540                         return SNMP_INTEGER(BGP_PeerAdmin_stop);
 541                 else
 542                         return SNMP_INTEGER(BGP_PeerAdmin_start);
 543                 break;
 544         case BGPPEERNEGOTIATEDVERSION:
 545                 return SNMP_INTEGER(BGP_VERSION_4);
 546                 break;
 547         case BGPPEERLOCALADDR:
 548                 if (peer->su_local)
 549                         return SNMP_IPADDRESS(peer->su_local->sin.sin_addr);
 550                 else
 551                         return SNMP_IPADDRESS(bgp_empty_addr);
 552                 break;
 553         case BGPPEERLOCALPORT:
 554                 if (peer->su_local)
 555                         return SNMP_INTEGER(
 556                                 ntohs(peer->su_local->sin.sin_port));
 557                 else
 558                         return SNMP_INTEGER(0);
 559                 break;
 560         case BGPPEERREMOTEADDR:
 561                 if (peer->su_remote)
 562                         return SNMP_IPADDRESS(peer->su_remote->sin.sin_addr);
 563                 else
 564                         return SNMP_IPADDRESS(bgp_empty_addr);
 565                 break;
 566         case BGPPEERREMOTEPORT:
 567                 if (peer->su_remote)
 568                         return SNMP_INTEGER(
 569                                 ntohs(peer->su_remote->sin.sin_port));
 570                 else
 571                         return SNMP_INTEGER(0);
 572                 break;
 573         case BGPPEERREMOTEAS:
 574                 return SNMP_INTEGER(peer->as);
 575                 break;
 576         case BGPPEERINUPDATES:
 577                 ui = atomic_load_explicit(&peer->update_in,
 578                                           memory_order_relaxed);
 579                 return SNMP_INTEGER(ui);
 580                 break;
 581         case BGPPEEROUTUPDATES:
 582                 uo = atomic_load_explicit(&peer->update_out,
 583                                           memory_order_relaxed);
 584                 return SNMP_INTEGER(uo);
 585                 break;
 586         case BGPPEERINTOTALMESSAGES:
 587                 return SNMP_INTEGER(PEER_TOTAL_RX(peer));
 588                 break;
 589         case BGPPEEROUTTOTALMESSAGES:
 590                 return SNMP_INTEGER(PEER_TOTAL_TX(peer));
 591                 break;
 592         case BGPPEERLASTERROR: {
 593                 static uint8_t lasterror[2];
 594                 lasterror[0] = peer->notify.code;
 595                 lasterror[1] = peer->notify.subcode;
 596                 *var_len = 2;
 597                 return (uint8_t *)&lasterror;
 598         } break;
 599         case BGPPEERFSMESTABLISHEDTRANSITIONS:
 600                 return SNMP_INTEGER(peer->established);
 601                 break;
 602         case BGPPEERFSMESTABLISHEDTIME:
 603                 if (peer->uptime == 0)
 604                         return SNMP_INTEGER(0);
 605                 else
 606                         return SNMP_INTEGER(bgp_clock() - peer->uptime);
 607                 break;
 608         case BGPPEERCONNECTRETRYINTERVAL:
 609                 *write_method = write_bgpPeerTable;
 610                 return SNMP_INTEGER(peer->v_connect);
 611                 break;
 612         case BGPPEERHOLDTIME:
 613                 return SNMP_INTEGER(peer->v_holdtime);
 614                 break;
 615         case BGPPEERKEEPALIVE:
 616                 return SNMP_INTEGER(peer->v_keepalive);
 617                 break;
 618         case BGPPEERHOLDTIMECONFIGURED:
 619                 *write_method = write_bgpPeerTable;
 620                 if (CHECK_FLAG(peer->flags, PEER_FLAG_TIMER))
 621                         return SNMP_INTEGER(peer->holdtime);
 622                 else
 623                         return SNMP_INTEGER(peer->v_holdtime);
 624                 break;
 625         case BGPPEERKEEPALIVECONFIGURED:
 626                 *write_method = write_bgpPeerTable;
 627                 if (CHECK_FLAG(peer->flags, PEER_FLAG_TIMER))
 628                         return SNMP_INTEGER(peer->keepalive);
 629                 else
 630                         return SNMP_INTEGER(peer->v_keepalive);
 631                 break;
 632         case BGPPEERMINROUTEADVERTISEMENTINTERVAL:
 633                 *write_method = write_bgpPeerTable;
 634                 return SNMP_INTEGER(peer->v_routeadv);
 635                 break;
 636         case BGPPEERINUPDATEELAPSEDTIME:
 637                 if (peer->update_time == 0)
 638                         return SNMP_INTEGER(0);
 639                 else
 640                         return SNMP_INTEGER(bgp_clock() - peer->update_time);
 641                 break;
 642         default:
 643                 return NULL;
 644                 break;
 645         }
 646         return NULL;
 647 }
 648
 649 static uint8_t *bgpIdentifier(struct variable *v, oid name[], size_t *length,
 650                               int exact, size_t *var_len,
 651                               WriteMethod **write_method)
 652 {
 653         struct bgp *bgp;
 654
 655         if (smux_header_generic(v, name, length, exact, var_len, write_method)
 656             == MATCH_FAILED)
 657                 return NULL;
 658
 659         bgp = bgp_get_default();
 660         if (!bgp)
 661                 return NULL;
 662
 663         return SNMP_IPADDRESS(bgp->router_id);
 664 }
 665
 666 static uint8_t *bgpRcvdPathAttrTable(struct variable *v, oid name[],
 667                                      size_t *length, int exact, size_t *var_len,
 668                                      WriteMethod **write_method)
 669 {
 670         /* Received Path Attribute Table.  This table contains, one entry
 671            per path to a network, path attributes received from all peers
 672            running BGP version 3 or less.  This table is obsolete, having
 673            been replaced in functionality with the bgp4PathAttrTable.  */
 674         return NULL;
 675 }
 676
 677 static struct bgp_path_info *bgp4PathAttrLookup(struct variable *v, oid name[],
 678                                                 size_t *length, struct bgp *bgp,
 679                                                 struct prefix_ipv4 *addr,
 680                                                 int exact)
 681 {
 682         oid *offset;
 683         int offsetlen;
 684         struct bgp_path_info *path;
 685         struct bgp_path_info *min;
 686         struct bgp_node *rn;
 687         union sockunion su;
 688         unsigned int len;
 689         struct in_addr paddr;
 690
 691         sockunion_init(&su);
 692
 693 #define BGP_PATHATTR_ENTRY_OFFSET (IN_ADDR_SIZE + 1 + IN_ADDR_SIZE)
 694
 695         if (exact) {
 696                 if (*length - v->namelen != BGP_PATHATTR_ENTRY_OFFSET)
 697                         return NULL;
 698
 699                 /* Set OID offset for prefix. */
 700                 offset = name + v->namelen;
 701                 oid2in_addr(offset, IN_ADDR_SIZE, &addr->prefix);
 702                 offset += IN_ADDR_SIZE;
 703
 704                 /* Prefix length. */
 705                 addr->prefixlen = *offset;
 706                 offset++;
 707
 708                 /* Peer address. */
 709                 su.sin.sin_family = AF_INET;
 710                 oid2in_addr(offset, IN_ADDR_SIZE, &su.sin.sin_addr);
 711
 712                 /* Lookup node. */
 713                 rn = bgp_node_lookup(bgp->rib[AFI_IP][SAFI_UNICAST],
 714                                      (struct prefix *)addr);
 715                 if (rn) {
 716                         bgp_unlock_node(rn);
 717
 718                         for (path = bgp_node_get_bgp_path_info(rn); path;
 719                              path = path->next)
 720                                 if (sockunion_same(&path->peer->su, &su))
 721                                         return path;
 722                 }
 723         } else {
 724                 offset = name + v->namelen;
 725                 offsetlen = *length - v->namelen;
 726                 len = offsetlen;
 727
 728                 if (offsetlen == 0)
 729                         rn = bgp_table_top(bgp->rib[AFI_IP][SAFI_UNICAST]);
 730                 else {
 731                         if (len > IN_ADDR_SIZE)
 732                                 len = IN_ADDR_SIZE;
 733
 734                         oid2in_addr(offset, len, &addr->prefix);
 735
 736                         offset += IN_ADDR_SIZE;
 737                         offsetlen -= IN_ADDR_SIZE;
 738
 739                         if (offsetlen > 0)
 740                                 addr->prefixlen = *offset;
 741                         else
 742                                 addr->prefixlen = len * 8;
 743
 744                         rn = bgp_node_get(bgp->rib[AFI_IP][SAFI_UNICAST],
 745                                           (struct prefix *)addr);
 746
 747                         offset++;
 748                         offsetlen--;
 749                 }
 750
 751                 if (offsetlen > 0) {
 752                         len = offsetlen;
 753                         if (len > IN_ADDR_SIZE)
 754                                 len = IN_ADDR_SIZE;
 755
 756                         oid2in_addr(offset, len, &paddr);
 757                 } else
 758                         paddr.s_addr = 0;
 759
 760                 if (!rn)
 761                         return NULL;
 762
 763                 do {
 764                         min = NULL;
 765
 766                         for (path = bgp_node_get_bgp_path_info(rn); path;
 767                              path = path->next) {
 768                                 if (path->peer->su.sin.sin_family == AF_INET
 769                                     && ntohl(paddr.s_addr)
 770                                                < ntohl(path->peer->su.sin
 771                                                                .sin_addr
 772                                                                .s_addr)) {
 773                                         if (min) {
 774                                                 if (ntohl(path->peer->su.sin
 775                                                                   .sin_addr
 776                                                                   .s_addr)
 777                                                     < ntohl(min->peer->su.sin
 778                                                                     .sin_addr
 779                                                                     .s_addr))
 780                                                         min = path;
 781                                         } else
 782                                                 min = path;
 783                                 }
 784                         }
 785
 786                         if (min) {
 787                                 *length =
 788                                         v->namelen + BGP_PATHATTR_ENTRY_OFFSET;
 789
 790                                 offset = name + v->namelen;
 791                                 oid_copy_addr(offset, &rn->p.u.prefix4,
 792                                               IN_ADDR_SIZE);
 793                                 offset += IN_ADDR_SIZE;
 794                                 *offset = rn->p.prefixlen;
 795                                 offset++;
 796                                 oid_copy_addr(offset,
 797                                               &min->peer->su.sin.sin_addr,
 798                                               IN_ADDR_SIZE);
 799                                 addr->prefix = rn->p.u.prefix4;
 800                                 addr->prefixlen = rn->p.prefixlen;
 801
 802                                 bgp_unlock_node(rn);
 803
 804                                 return min;
 805                         }
 806
 807                         paddr.s_addr = 0;
 808                 } while ((rn = bgp_route_next(rn)) != NULL);
 809         }
 810         return NULL;
 811 }
 812
 813 static uint8_t *bgp4PathAttrTable(struct variable *v, oid name[],
 814                                   size_t *length, int exact, size_t *var_len,
 815                                   WriteMethod **write_method)
 816 {
 817         struct bgp *bgp;
 818         struct bgp_path_info *path;
 819         struct prefix_ipv4 addr;
 820
 821         bgp = bgp_get_default();
 822         if (!bgp)
 823                 return NULL;
 824
 825         if (smux_header_table(v, name, length, exact, var_len, write_method)
 826             == MATCH_FAILED)
 827                 return NULL;
 828         memset(&addr, 0, sizeof(struct prefix_ipv4));
 829
 830         path = bgp4PathAttrLookup(v, name, length, bgp, &addr, exact);
 831         if (!path)
 832                 return NULL;
 833
 834         switch (v->magic) {
 835         case BGP4PATHATTRPEER: /* 1 */
 836                 return SNMP_IPADDRESS(path->peer->su.sin.sin_addr);
 837                 break;
 838         case BGP4PATHATTRIPADDRPREFIXLEN: /* 2 */
 839                 return SNMP_INTEGER(addr.prefixlen);
 840                 break;
 841         case BGP4PATHATTRIPADDRPREFIX: /* 3 */
 842                 return SNMP_IPADDRESS(addr.prefix);
 843                 break;
 844         case BGP4PATHATTRORIGIN: /* 4 */
 845                 return SNMP_INTEGER(path->attr->origin);
 846                 break;
 847         case BGP4PATHATTRASPATHSEGMENT: /* 5 */
 848                 return aspath_snmp_pathseg(path->attr->aspath, var_len);
 849                 break;
 850         case BGP4PATHATTRNEXTHOP: /* 6 */
 851                 return SNMP_IPADDRESS(path->attr->nexthop);
 852                 break;
 853         case BGP4PATHATTRMULTIEXITDISC: /* 7 */
 854                 return SNMP_INTEGER(path->attr->med);
 855                 break;
 856         case BGP4PATHATTRLOCALPREF: /* 8 */
 857                 return SNMP_INTEGER(path->attr->local_pref);
 858                 break;
 859         case BGP4PATHATTRATOMICAGGREGATE: /* 9 */
 860                 return SNMP_INTEGER(1);
 861                 break;
 862         case BGP4PATHATTRAGGREGATORAS: /* 10 */
 863                 return SNMP_INTEGER(path->attr->aggregator_as);
 864                 break;
 865         case BGP4PATHATTRAGGREGATORADDR: /* 11 */
 866                 return SNMP_IPADDRESS(path->attr->aggregator_addr);
 867                 break;
 868         case BGP4PATHATTRCALCLOCALPREF: /* 12 */
 869                 return SNMP_INTEGER(-1);
 870                 break;
 871         case BGP4PATHATTRBEST: /* 13 */
 872 #define BGP4_PathAttrBest_false 1
 873 #define BGP4_PathAttrBest_true  2
 874                 if (CHECK_FLAG(path->flags, BGP_PATH_SELECTED))
 875                         return SNMP_INTEGER(BGP4_PathAttrBest_true);
 876                 else
 877                         return SNMP_INTEGER(BGP4_PathAttrBest_false);
 878                 break;
 879         case BGP4PATHATTRUNKNOWN: /* 14 */
 880                 *var_len = 0;
 881                 return NULL;
 882                 break;
 883         }
 884         return NULL;
 885 }
 886
 887 /* BGP Traps. */
 888 static struct trap_object bgpTrapList[] = {{3, {3, 1, BGPPEERLASTERROR}},
 889                                            {3, {3, 1, BGPPEERSTATE}}};
 890
 891 static int bgpTrapEstablished(struct peer *peer)
 892 {
 893         int ret;
 894         struct in_addr addr;
 895         oid index[sizeof(oid) * IN_ADDR_SIZE];
 896
 897         ret = inet_aton(peer->host, &addr);
 898         if (ret == 0)
 899                 return 0;
 900
 901         oid_copy_addr(index, &addr, IN_ADDR_SIZE);
 902
 903         smux_trap(bgp_variables, sizeof bgp_variables / sizeof(struct variable),
 904                   bgp_trap_oid, sizeof bgp_trap_oid / sizeof(oid), bgp_oid,
 905                   sizeof bgp_oid / sizeof(oid), index, IN_ADDR_SIZE,
 906                   bgpTrapList, sizeof bgpTrapList / sizeof(struct trap_object),
 907                   BGPESTABLISHED);
 908         return 0;
 909 }
 910
 911 static int bgpTrapBackwardTransition(struct peer *peer)
 912 {
 913         int ret;
 914         struct in_addr addr;
 915         oid index[sizeof(oid) * IN_ADDR_SIZE];
 916
 917         ret = inet_aton(peer->host, &addr);
 918         if (ret == 0)
 919                 return 0;
 920
 921         oid_copy_addr(index, &addr, IN_ADDR_SIZE);
 922
 923         smux_trap(bgp_variables, sizeof bgp_variables / sizeof(struct variable),
 924                   bgp_trap_oid, sizeof bgp_trap_oid / sizeof(oid), bgp_oid,
 925                   sizeof bgp_oid / sizeof(oid), index, IN_ADDR_SIZE,
 926                   bgpTrapList, sizeof bgpTrapList / sizeof(struct trap_object),
 927                   BGPBACKWARDTRANSITION);
 928         return 0;
 929 }
 930
 931 static int bgp_snmp_init(struct thread_master *tm)
 932 {
 933         smux_init(tm);
 934         REGISTER_MIB("mibII/bgp", bgp_variables, variable, bgp_oid);
 935         return 0;
 936 }
 937
 938 static int bgp_snmp_module_init(void)
 939 {
 940         hook_register(peer_established, bgpTrapEstablished);
 941         hook_register(peer_backward_transition, bgpTrapBackwardTransition);
 942         hook_register(frr_late_init, bgp_snmp_init);
 943         return 0;
 944 }
 945
 946 FRR_MODULE_SETUP(.name = "bgpd_snmp", .version = FRR_VERSION,
 947                  .description = "bgpd AgentX SNMP module",
 948                  .init = bgp_snmp_module_init)