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 &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         struct listnode *bgpnode;
 360
 361         for (ALL_LIST_ELEMENTS_RO(bm->bgp, bgpnode, bgp)) {
 362                 for (ALL_LIST_ELEMENTS_RO(bgp->peer, node, peer)) {
 363                         if (sockunion_family(&peer->su) != AF_INET)
 364                                 continue;
 365
 366                         if (sockunion2ip(&peer->su) == src->s_addr)
 367                                 return peer;
 368                 }
 369         }
 370
 371         return NULL;
 372 }
 373
 374 static struct peer *bgp_peer_lookup_next(struct in_addr *src)
 375 {
 376         struct bgp *bgp;
 377         struct peer *peer;
 378         struct peer *next_peer = NULL;
 379         struct listnode *node;
 380         struct listnode *bgpnode;
 381
 382         for (ALL_LIST_ELEMENTS_RO(bm->bgp, bgpnode, bgp)) {
 383                 for (ALL_LIST_ELEMENTS_RO(bgp->peer, node, peer)) {
 384                         if (sockunion_family(&peer->su) != AF_INET)
 385                                 continue;
 386                         if (ntohl(sockunion2ip(&peer->su)) <= ntohl(src->s_addr))
 387                                 continue;
 388
 389                         if (!next_peer
 390                             || ntohl(sockunion2ip(&next_peer->su))
 391                                        > ntohl(sockunion2ip(&peer->su))) {
 392                                 next_peer = peer;
 393                         }
 394                 }
 395         }
 396
 397         if (next_peer) {
 398                 src->s_addr = sockunion2ip(&next_peer->su);
 399                 return next_peer;
 400         }
 401
 402         return NULL;
 403 }
 404
 405 /* 1.3.6.1.2.1.15.3.1.x  = 10 */
 406 #define PEERTAB_NAMELEN 10
 407
 408 static struct peer *bgpPeerTable_lookup(struct variable *v, oid name[],
 409                                         size_t *length, struct in_addr *addr,
 410                                         int exact)
 411 {
 412         struct peer *peer = NULL;
 413         size_t namelen = v ? v->namelen : PEERTAB_NAMELEN;
 414         int len;
 415
 416         if (exact) {
 417                 /* Check the length. */
 418                 if (*length - namelen != sizeof(struct in_addr))
 419                         return NULL;
 420
 421                 oid2in_addr(name + namelen, IN_ADDR_SIZE, addr);
 422
 423                 peer = peer_lookup_addr_ipv4(addr);
 424                 return peer;
 425         } else {
 426                 len = *length - namelen;
 427                 if (len > 4)
 428                         len = 4;
 429
 430                 oid2in_addr(name + namelen, len, addr);
 431
 432                 peer = bgp_peer_lookup_next(addr);
 433
 434                 if (peer == NULL)
 435                         return NULL;
 436
 437                 oid_copy_addr(name + namelen, addr, sizeof(struct in_addr));
 438                 *length = sizeof(struct in_addr) + namelen;
 439
 440                 return peer;
 441         }
 442         return NULL;
 443 }
 444
 445 /* BGP write methods. */
 446 static int write_bgpPeerTable(int action, uint8_t *var_val,
 447                               uint8_t var_val_type, size_t var_val_len,
 448                               uint8_t *statP, oid *name, size_t length)
 449 {
 450         struct in_addr addr;
 451         struct peer *peer;
 452         long intval;
 453
 454         if (var_val_type != ASN_INTEGER) {
 455                 return SNMP_ERR_WRONGTYPE;
 456         }
 457         if (var_val_len != sizeof(long)) {
 458                 return SNMP_ERR_WRONGLENGTH;
 459         }
 460
 461         intval = *(long *)var_val;
 462
 463         memset(&addr, 0, sizeof(struct in_addr));
 464
 465         peer = bgpPeerTable_lookup(NULL, name, &length, &addr, 1);
 466         if (!peer)
 467                 return SNMP_ERR_NOSUCHNAME;
 468
 469         if (action != SNMP_MSG_INTERNAL_SET_COMMIT)
 470                 return SNMP_ERR_NOERROR;
 471
 472         zlog_info("%s: SNMP write .%ld = %ld", peer->host,
 473                   (long)name[PEERTAB_NAMELEN - 1], intval);
 474
 475         switch (name[PEERTAB_NAMELEN - 1]) {
 476         case BGPPEERADMINSTATUS:
 477 #define BGP_PeerAdmin_stop  1
 478 #define BGP_PeerAdmin_start 2
 479                 /* When the peer is established,   */
 480                 if (intval == BGP_PeerAdmin_stop)
 481                         BGP_EVENT_ADD(peer, BGP_Stop);
 482                 else if (intval == BGP_PeerAdmin_start)
 483                         ; /* Do nothing. */
 484                 else
 485                         return SNMP_ERR_NOSUCHNAME;
 486                 break;
 487         case BGPPEERCONNECTRETRYINTERVAL:
 488                 peer_flag_set(peer, PEER_FLAG_TIMER_CONNECT);
 489                 peer->connect = intval;
 490                 peer->v_connect = intval;
 491                 break;
 492         case BGPPEERHOLDTIMECONFIGURED:
 493                 peer_flag_set(peer, PEER_FLAG_TIMER);
 494                 peer->holdtime = intval;
 495                 peer->v_holdtime = intval;
 496                 break;
 497         case BGPPEERKEEPALIVECONFIGURED:
 498                 peer_flag_set(peer, PEER_FLAG_TIMER);
 499                 peer->keepalive = intval;
 500                 peer->v_keepalive = intval;
 501                 break;
 502         case BGPPEERMINROUTEADVERTISEMENTINTERVAL:
 503                 peer->v_routeadv = intval;
 504                 break;
 505         }
 506         return SNMP_ERR_NOERROR;
 507 }
 508
 509 static uint8_t *bgpPeerTable(struct variable *v, oid name[], size_t *length,
 510                              int exact, size_t *var_len,
 511                              WriteMethod **write_method)
 512 {
 513         static struct in_addr addr;
 514         struct peer *peer;
 515         uint32_t ui, uo;
 516
 517         if (smux_header_table(v, name, length, exact, var_len, write_method)
 518             == MATCH_FAILED)
 519                 return NULL;
 520         memset(&addr, 0, sizeof(struct in_addr));
 521
 522         peer = bgpPeerTable_lookup(v, name, length, &addr, exact);
 523         if (!peer)
 524                 return NULL;
 525
 526         switch (v->magic) {
 527         case BGPPEERIDENTIFIER:
 528                 return SNMP_IPADDRESS(peer->remote_id);
 529         case BGPPEERSTATE:
 530                 return SNMP_INTEGER(peer->status);
 531         case BGPPEERADMINSTATUS:
 532                 *write_method = write_bgpPeerTable;
 533 #define BGP_PeerAdmin_stop  1
 534 #define BGP_PeerAdmin_start 2
 535                 if (CHECK_FLAG(peer->flags, PEER_FLAG_SHUTDOWN))
 536                         return SNMP_INTEGER(BGP_PeerAdmin_stop);
 537                 else
 538                         return SNMP_INTEGER(BGP_PeerAdmin_start);
 539         case BGPPEERNEGOTIATEDVERSION:
 540                 return SNMP_INTEGER(BGP_VERSION_4);
 541         case BGPPEERLOCALADDR:
 542                 if (peer->su_local)
 543                         return SNMP_IPADDRESS(peer->su_local->sin.sin_addr);
 544                 else
 545                         return SNMP_IPADDRESS(bgp_empty_addr);
 546         case BGPPEERLOCALPORT:
 547                 if (peer->su_local)
 548                         return SNMP_INTEGER(
 549                                 ntohs(peer->su_local->sin.sin_port));
 550                 else
 551                         return SNMP_INTEGER(0);
 552         case BGPPEERREMOTEADDR:
 553                 if (peer->su_remote)
 554                         return SNMP_IPADDRESS(peer->su_remote->sin.sin_addr);
 555                 else
 556                         return SNMP_IPADDRESS(bgp_empty_addr);
 557         case BGPPEERREMOTEPORT:
 558                 if (peer->su_remote)
 559                         return SNMP_INTEGER(
 560                                 ntohs(peer->su_remote->sin.sin_port));
 561                 else
 562                         return SNMP_INTEGER(0);
 563         case BGPPEERREMOTEAS:
 564                 return SNMP_INTEGER(peer->as);
 565         case BGPPEERINUPDATES:
 566                 ui = atomic_load_explicit(&peer->update_in,
 567                                           memory_order_relaxed);
 568                 return SNMP_INTEGER(ui);
 569         case BGPPEEROUTUPDATES:
 570                 uo = atomic_load_explicit(&peer->update_out,
 571                                           memory_order_relaxed);
 572                 return SNMP_INTEGER(uo);
 573         case BGPPEERINTOTALMESSAGES:
 574                 return SNMP_INTEGER(PEER_TOTAL_RX(peer));
 575         case BGPPEEROUTTOTALMESSAGES:
 576                 return SNMP_INTEGER(PEER_TOTAL_TX(peer));
 577         case BGPPEERLASTERROR: {
 578                 static uint8_t lasterror[2];
 579                 lasterror[0] = peer->notify.code;
 580                 lasterror[1] = peer->notify.subcode;
 581                 *var_len = 2;
 582                 return (uint8_t *)&lasterror;
 583         }
 584         case BGPPEERFSMESTABLISHEDTRANSITIONS:
 585                 return SNMP_INTEGER(peer->established);
 586         case BGPPEERFSMESTABLISHEDTIME:
 587                 if (peer->uptime == 0)
 588                         return SNMP_INTEGER(0);
 589                 else
 590                         return SNMP_INTEGER(bgp_clock() - peer->uptime);
 591         case BGPPEERCONNECTRETRYINTERVAL:
 592                 *write_method = write_bgpPeerTable;
 593                 return SNMP_INTEGER(peer->v_connect);
 594         case BGPPEERHOLDTIME:
 595                 return SNMP_INTEGER(peer->v_holdtime);
 596         case BGPPEERKEEPALIVE:
 597                 return SNMP_INTEGER(peer->v_keepalive);
 598         case BGPPEERHOLDTIMECONFIGURED:
 599                 *write_method = write_bgpPeerTable;
 600                 if (CHECK_FLAG(peer->flags, PEER_FLAG_TIMER))
 601                         return SNMP_INTEGER(peer->holdtime);
 602                 else
 603                         return SNMP_INTEGER(peer->v_holdtime);
 604         case BGPPEERKEEPALIVECONFIGURED:
 605                 *write_method = write_bgpPeerTable;
 606                 if (CHECK_FLAG(peer->flags, PEER_FLAG_TIMER))
 607                         return SNMP_INTEGER(peer->keepalive);
 608                 else
 609                         return SNMP_INTEGER(peer->v_keepalive);
 610         case BGPPEERMINROUTEADVERTISEMENTINTERVAL:
 611                 *write_method = write_bgpPeerTable;
 612                 return SNMP_INTEGER(peer->v_routeadv);
 613         case BGPPEERINUPDATEELAPSEDTIME:
 614                 if (peer->update_time == 0)
 615                         return SNMP_INTEGER(0);
 616                 else
 617                         return SNMP_INTEGER(bgp_clock() - peer->update_time);
 618         default:
 619                 return NULL;
 620         }
 621         return NULL;
 622 }
 623
 624 static uint8_t *bgpIdentifier(struct variable *v, oid name[], size_t *length,
 625                               int exact, size_t *var_len,
 626                               WriteMethod **write_method)
 627 {
 628         struct bgp *bgp;
 629
 630         if (smux_header_generic(v, name, length, exact, var_len, write_method)
 631             == MATCH_FAILED)
 632                 return NULL;
 633
 634         bgp = bgp_get_default();
 635         if (!bgp)
 636                 return NULL;
 637
 638         return SNMP_IPADDRESS(bgp->router_id);
 639 }
 640
 641 static uint8_t *bgpRcvdPathAttrTable(struct variable *v, oid name[],
 642                                      size_t *length, int exact, size_t *var_len,
 643                                      WriteMethod **write_method)
 644 {
 645         /* Received Path Attribute Table.  This table contains, one entry
 646            per path to a network, path attributes received from all peers
 647            running BGP version 3 or less.  This table is obsolete, having
 648            been replaced in functionality with the bgp4PathAttrTable.  */
 649         return NULL;
 650 }
 651
 652 static struct bgp_path_info *bgp4PathAttrLookup(struct variable *v, oid name[],
 653                                                 size_t *length, struct bgp *bgp,
 654                                                 struct prefix_ipv4 *addr,
 655                                                 int exact)
 656 {
 657         oid *offset;
 658         int offsetlen;
 659         struct bgp_path_info *path;
 660         struct bgp_path_info *min;
 661         struct bgp_dest *dest;
 662         union sockunion su;
 663         unsigned int len;
 664         struct in_addr paddr;
 665
 666         sockunion_init(&su);
 667
 668 #define BGP_PATHATTR_ENTRY_OFFSET (IN_ADDR_SIZE + 1 + IN_ADDR_SIZE)
 669
 670         if (exact) {
 671                 if (*length - v->namelen != BGP_PATHATTR_ENTRY_OFFSET)
 672                         return NULL;
 673
 674                 /* Set OID offset for prefix. */
 675                 offset = name + v->namelen;
 676                 oid2in_addr(offset, IN_ADDR_SIZE, &addr->prefix);
 677                 offset += IN_ADDR_SIZE;
 678
 679                 /* Prefix length. */
 680                 addr->prefixlen = *offset;
 681                 offset++;
 682
 683                 /* Peer address. */
 684                 su.sin.sin_family = AF_INET;
 685                 oid2in_addr(offset, IN_ADDR_SIZE, &su.sin.sin_addr);
 686
 687                 /* Lookup node. */
 688                 dest = bgp_node_lookup(bgp->rib[AFI_IP][SAFI_UNICAST],
 689                                        (struct prefix *)addr);
 690                 if (dest) {
 691                         bgp_dest_unlock_node(dest);
 692
 693                         for (path = bgp_dest_get_bgp_path_info(dest); path;
 694                              path = path->next)
 695                                 if (sockunion_same(&path->peer->su, &su))
 696                                         return path;
 697                 }
 698         } else {
 699                 offset = name + v->namelen;
 700                 offsetlen = *length - v->namelen;
 701                 len = offsetlen;
 702
 703                 if (offsetlen == 0)
 704                         dest = bgp_table_top(bgp->rib[AFI_IP][SAFI_UNICAST]);
 705                 else {
 706                         if (len > IN_ADDR_SIZE)
 707                                 len = IN_ADDR_SIZE;
 708
 709                         oid2in_addr(offset, len, &addr->prefix);
 710
 711                         offset += IN_ADDR_SIZE;
 712                         offsetlen -= IN_ADDR_SIZE;
 713
 714                         if (offsetlen > 0)
 715                                 addr->prefixlen = *offset;
 716                         else
 717                                 addr->prefixlen = len * 8;
 718
 719                         dest = bgp_node_get(bgp->rib[AFI_IP][SAFI_UNICAST],
 720                                             (struct prefix *)addr);
 721
 722                         offset++;
 723                         offsetlen--;
 724                 }
 725
 726                 if (offsetlen > 0) {
 727                         len = offsetlen;
 728                         if (len > IN_ADDR_SIZE)
 729                                 len = IN_ADDR_SIZE;
 730
 731                         oid2in_addr(offset, len, &paddr);
 732                 } else
 733                         paddr.s_addr = INADDR_ANY;
 734
 735                 if (!dest)
 736                         return NULL;
 737
 738                 do {
 739                         min = NULL;
 740
 741                         for (path = bgp_dest_get_bgp_path_info(dest); path;
 742                              path = path->next) {
 743                                 if (path->peer->su.sin.sin_family == AF_INET
 744                                     && ntohl(paddr.s_addr)
 745                                                < ntohl(path->peer->su.sin
 746                                                                .sin_addr
 747                                                                .s_addr)) {
 748                                         if (min) {
 749                                                 if (ntohl(path->peer->su.sin
 750                                                                   .sin_addr
 751                                                                   .s_addr)
 752                                                     < ntohl(min->peer->su.sin
 753                                                                     .sin_addr
 754                                                                     .s_addr))
 755                                                         min = path;
 756                                         } else
 757                                                 min = path;
 758                                 }
 759                         }
 760
 761                         if (min) {
 762                                 const struct prefix *rn_p =
 763                                         bgp_dest_get_prefix(dest);
 764
 765                                 *length =
 766                                         v->namelen + BGP_PATHATTR_ENTRY_OFFSET;
 767
 768                                 offset = name + v->namelen;
 769                                 oid_copy_addr(offset, &rn_p->u.prefix4,
 770                                               IN_ADDR_SIZE);
 771                                 offset += IN_ADDR_SIZE;
 772                                 *offset = rn_p->prefixlen;
 773                                 offset++;
 774                                 oid_copy_addr(offset,
 775                                               &min->peer->su.sin.sin_addr,
 776                                               IN_ADDR_SIZE);
 777                                 addr->prefix = rn_p->u.prefix4;
 778                                 addr->prefixlen = rn_p->prefixlen;
 779
 780                                 bgp_dest_unlock_node(dest);
 781
 782                                 return min;
 783                         }
 784
 785                         paddr.s_addr = INADDR_ANY;
 786                 } while ((dest = bgp_route_next(dest)) != NULL);
 787         }
 788         return NULL;
 789 }
 790
 791 static uint8_t *bgp4PathAttrTable(struct variable *v, oid name[],
 792                                   size_t *length, int exact, size_t *var_len,
 793                                   WriteMethod **write_method)
 794 {
 795         struct bgp *bgp;
 796         struct bgp_path_info *path;
 797         struct prefix_ipv4 addr;
 798
 799         bgp = bgp_get_default();
 800         if (!bgp)
 801                 return NULL;
 802
 803         if (smux_header_table(v, name, length, exact, var_len, write_method)
 804             == MATCH_FAILED)
 805                 return NULL;
 806         memset(&addr, 0, sizeof(struct prefix_ipv4));
 807
 808         path = bgp4PathAttrLookup(v, name, length, bgp, &addr, exact);
 809         if (!path)
 810                 return NULL;
 811
 812         switch (v->magic) {
 813         case BGP4PATHATTRPEER: /* 1 */
 814                 return SNMP_IPADDRESS(path->peer->su.sin.sin_addr);
 815         case BGP4PATHATTRIPADDRPREFIXLEN: /* 2 */
 816                 return SNMP_INTEGER(addr.prefixlen);
 817         case BGP4PATHATTRIPADDRPREFIX: /* 3 */
 818                 return SNMP_IPADDRESS(addr.prefix);
 819         case BGP4PATHATTRORIGIN: /* 4 */
 820                 return SNMP_INTEGER(path->attr->origin);
 821         case BGP4PATHATTRASPATHSEGMENT: /* 5 */
 822                 return aspath_snmp_pathseg(path->attr->aspath, var_len);
 823         case BGP4PATHATTRNEXTHOP: /* 6 */
 824                 return SNMP_IPADDRESS(path->attr->nexthop);
 825         case BGP4PATHATTRMULTIEXITDISC: /* 7 */
 826                 return SNMP_INTEGER(path->attr->med);
 827         case BGP4PATHATTRLOCALPREF: /* 8 */
 828                 return SNMP_INTEGER(path->attr->local_pref);
 829         case BGP4PATHATTRATOMICAGGREGATE: /* 9 */
 830                 return SNMP_INTEGER(1);
 831         case BGP4PATHATTRAGGREGATORAS: /* 10 */
 832                 return SNMP_INTEGER(path->attr->aggregator_as);
 833         case BGP4PATHATTRAGGREGATORADDR: /* 11 */
 834                 return SNMP_IPADDRESS(path->attr->aggregator_addr);
 835         case BGP4PATHATTRCALCLOCALPREF: /* 12 */
 836                 return SNMP_INTEGER(-1);
 837         case BGP4PATHATTRBEST: /* 13 */
 838 #define BGP4_PathAttrBest_false 1
 839 #define BGP4_PathAttrBest_true  2
 840                 if (CHECK_FLAG(path->flags, BGP_PATH_SELECTED))
 841                         return SNMP_INTEGER(BGP4_PathAttrBest_true);
 842                 else
 843                         return SNMP_INTEGER(BGP4_PathAttrBest_false);
 844         case BGP4PATHATTRUNKNOWN: /* 14 */
 845                 *var_len = 0;
 846                 return NULL;
 847         }
 848         return NULL;
 849 }
 850
 851 /* BGP Traps. */
 852 static struct trap_object bgpTrapList[] = {{3, {3, 1, BGPPEERLASTERROR}},
 853                                            {3, {3, 1, BGPPEERSTATE}}};
 854
 855 static int bgpTrapEstablished(struct peer *peer)
 856 {
 857         int ret;
 858         struct in_addr addr;
 859         oid index[sizeof(oid) * IN_ADDR_SIZE];
 860
 861         /* Check if this peer just went to Established */
 862         if ((peer->ostatus != OpenConfirm) || !(peer_established(peer)))
 863                 return 0;
 864
 865         ret = inet_aton(peer->host, &addr);
 866         if (ret == 0)
 867                 return 0;
 868
 869         oid_copy_addr(index, &addr, IN_ADDR_SIZE);
 870
 871         smux_trap(bgp_variables, array_size(bgp_variables), bgp_trap_oid,
 872                   array_size(bgp_trap_oid), bgp_oid,
 873                   sizeof(bgp_oid) / sizeof(oid), index, IN_ADDR_SIZE,
 874                   bgpTrapList, array_size(bgpTrapList), BGPESTABLISHED);
 875         return 0;
 876 }
 877
 878 static int bgpTrapBackwardTransition(struct peer *peer)
 879 {
 880         int ret;
 881         struct in_addr addr;
 882         oid index[sizeof(oid) * IN_ADDR_SIZE];
 883
 884         ret = inet_aton(peer->host, &addr);
 885         if (ret == 0)
 886                 return 0;
 887
 888         oid_copy_addr(index, &addr, IN_ADDR_SIZE);
 889
 890         smux_trap(bgp_variables, array_size(bgp_variables), bgp_trap_oid,
 891                   array_size(bgp_trap_oid), bgp_oid,
 892                   sizeof(bgp_oid) / sizeof(oid), index, IN_ADDR_SIZE,
 893                   bgpTrapList, array_size(bgpTrapList), BGPBACKWARDTRANSITION);
 894         return 0;
 895 }
 896
 897 static int bgp_snmp_init(struct thread_master *tm)
 898 {
 899         smux_init(tm);
 900         REGISTER_MIB("mibII/bgp", bgp_variables, variable, bgp_oid);
 901         return 0;
 902 }
 903
 904 static int bgp_snmp_module_init(void)
 905 {
 906         hook_register(peer_status_changed, bgpTrapEstablished);
 907         hook_register(peer_backward_transition, bgpTrapBackwardTransition);
 908         hook_register(frr_late_init, bgp_snmp_init);
 909         return 0;
 910 }
 911
 912 FRR_MODULE_SETUP(.name = "bgpd_snmp", .version = FRR_VERSION,
 913                  .description = "bgpd AgentX SNMP module",
 914                  .init = bgp_snmp_module_init)