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 u_char *bgpVersion(struct variable *, oid[], size_t *, int, size_t *,
 129                           WriteMethod **);
 130 static u_char *bgpLocalAs(struct variable *, oid[], size_t *, int, size_t *,
 131                           WriteMethod **);
 132 static u_char *bgpPeerTable(struct variable *, oid[], size_t *, int, size_t *,
 133                             WriteMethod **);
 134 static u_char *bgpRcvdPathAttrTable(struct variable *, oid[], size_t *, int,
 135                                     size_t *, WriteMethod **);
 136 static u_char *bgpIdentifier(struct variable *, oid[], size_t *, int, size_t *,
 137                              WriteMethod **);
 138 static u_char *bgp4PathAttrTable(struct variable *, oid[], size_t *, int,
 139                                  size_t *, WriteMethod **);
 140 /* static u_char *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 u_char *bgpVersion(struct variable *v, oid name[], size_t *length,
 319                           int exact, size_t *var_len,
 320                           WriteMethod **write_method)
 321 {
 322         static u_char 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 (u_char *)&version;
 334 }
 335
 336 static u_char *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 in_addr addr;
 360         int ret;
 361
 362         bgp = bgp_get_default();
 363         if (!bgp)
 364                 return NULL;
 365
 366         for (ALL_LIST_ELEMENTS_RO(bgp->peer, node, peer)) {
 367                 ret = inet_pton(AF_INET, peer->host, &addr);
 368                 if (ret > 0) {
 369                         if (IPV4_ADDR_SAME(&addr, src))
 370                                 return peer;
 371                 }
 372         }
 373         return NULL;
 374 }
 375
 376 static struct peer *bgp_peer_lookup_next(struct in_addr *src)
 377 {
 378         struct bgp *bgp;
 379         struct peer *peer;
 380         struct listnode *node;
 381         struct in_addr *p;
 382         union sockunion su;
 383         int ret;
 384
 385         sockunion_init(&su);
 386
 387         bgp = bgp_get_default();
 388         if (!bgp)
 389                 return NULL;
 390
 391         for (ALL_LIST_ELEMENTS_RO(bgp->peer, node, peer)) {
 392                 ret = inet_pton(AF_INET, peer->host, &su.sin.sin_addr);
 393                 if (ret > 0) {
 394                         p = &su.sin.sin_addr;
 395
 396                         if (ntohl(p->s_addr) > ntohl(src->s_addr)) {
 397                                 src->s_addr = p->s_addr;
 398                                 return peer;
 399                         }
 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, u_char *var_val, u_char var_val_type,
 447                               size_t var_val_len, u_char *statP, oid *name,
 448                               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                 SET_FLAG(peer->config, PEER_CONFIG_CONNECT);
 489                 peer->connect = intval;
 490                 peer->v_connect = intval;
 491                 break;
 492         case BGPPEERHOLDTIMECONFIGURED:
 493                 SET_FLAG(peer->config, PEER_CONFIG_TIMER);
 494                 peer->holdtime = intval;
 495                 peer->v_holdtime = intval;
 496                 break;
 497         case BGPPEERKEEPALIVECONFIGURED:
 498                 SET_FLAG(peer->config, PEER_CONFIG_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 u_char *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
 516         if (smux_header_table(v, name, length, exact, var_len, write_method)
 517             == MATCH_FAILED)
 518                 return NULL;
 519         memset(&addr, 0, sizeof(struct in_addr));
 520
 521         peer = bgpPeerTable_lookup(v, name, length, &addr, exact);
 522         if (!peer)
 523                 return NULL;
 524
 525         switch (v->magic) {
 526         case BGPPEERIDENTIFIER:
 527                 return SNMP_IPADDRESS(peer->remote_id);
 528                 break;
 529         case BGPPEERSTATE:
 530                 return SNMP_INTEGER(peer->status);
 531                 break;
 532         case BGPPEERADMINSTATUS:
 533                 *write_method = write_bgpPeerTable;
 534 #define BGP_PeerAdmin_stop  1
 535 #define BGP_PeerAdmin_start 2
 536                 if (CHECK_FLAG(peer->flags, PEER_FLAG_SHUTDOWN))
 537                         return SNMP_INTEGER(BGP_PeerAdmin_stop);
 538                 else
 539                         return SNMP_INTEGER(BGP_PeerAdmin_start);
 540                 break;
 541         case BGPPEERNEGOTIATEDVERSION:
 542                 return SNMP_INTEGER(BGP_VERSION_4);
 543                 break;
 544         case BGPPEERLOCALADDR:
 545                 if (peer->su_local)
 546                         return SNMP_IPADDRESS(peer->su_local->sin.sin_addr);
 547                 else
 548                         return SNMP_IPADDRESS(bgp_empty_addr);
 549                 break;
 550         case BGPPEERLOCALPORT:
 551                 if (peer->su_local)
 552                         return SNMP_INTEGER(
 553                                 ntohs(peer->su_local->sin.sin_port));
 554                 else
 555                         return SNMP_INTEGER(0);
 556                 break;
 557         case BGPPEERREMOTEADDR:
 558                 if (peer->su_remote)
 559                         return SNMP_IPADDRESS(peer->su_remote->sin.sin_addr);
 560                 else
 561                         return SNMP_IPADDRESS(bgp_empty_addr);
 562                 break;
 563         case BGPPEERREMOTEPORT:
 564                 if (peer->su_remote)
 565                         return SNMP_INTEGER(
 566                                 ntohs(peer->su_remote->sin.sin_port));
 567                 else
 568                         return SNMP_INTEGER(0);
 569                 break;
 570         case BGPPEERREMOTEAS:
 571                 return SNMP_INTEGER(peer->as);
 572                 break;
 573         case BGPPEERINUPDATES:
 574                 return SNMP_INTEGER(peer->update_in);
 575                 break;
 576         case BGPPEEROUTUPDATES:
 577                 return SNMP_INTEGER(peer->update_out);
 578                 break;
 579         case BGPPEERINTOTALMESSAGES:
 580                 return SNMP_INTEGER(peer->open_in + peer->update_in
 581                                     + peer->keepalive_in + peer->notify_in
 582                                     + peer->refresh_in + peer->dynamic_cap_in);
 583                 break;
 584         case BGPPEEROUTTOTALMESSAGES:
 585                 return SNMP_INTEGER(peer->open_out + peer->update_out
 586                                     + peer->keepalive_out + peer->notify_out
 587                                     + peer->refresh_out
 588                                     + peer->dynamic_cap_out);
 589                 break;
 590         case BGPPEERLASTERROR: {
 591                 static u_char lasterror[2];
 592                 lasterror[0] = peer->notify.code;
 593                 lasterror[1] = peer->notify.subcode;
 594                 *var_len = 2;
 595                 return (u_char *)&lasterror;
 596         } break;
 597         case BGPPEERFSMESTABLISHEDTRANSITIONS:
 598                 return SNMP_INTEGER(peer->established);
 599                 break;
 600         case BGPPEERFSMESTABLISHEDTIME:
 601                 if (peer->uptime == 0)
 602                         return SNMP_INTEGER(0);
 603                 else
 604                         return SNMP_INTEGER(bgp_clock() - peer->uptime);
 605                 break;
 606         case BGPPEERCONNECTRETRYINTERVAL:
 607                 *write_method = write_bgpPeerTable;
 608                 return SNMP_INTEGER(peer->v_connect);
 609                 break;
 610         case BGPPEERHOLDTIME:
 611                 return SNMP_INTEGER(peer->v_holdtime);
 612                 break;
 613         case BGPPEERKEEPALIVE:
 614                 return SNMP_INTEGER(peer->v_keepalive);
 615                 break;
 616         case BGPPEERHOLDTIMECONFIGURED:
 617                 *write_method = write_bgpPeerTable;
 618                 if (PEER_OR_GROUP_TIMER_SET(peer))
 619                         return SNMP_INTEGER(peer->holdtime);
 620                 else
 621                         return SNMP_INTEGER(peer->v_holdtime);
 622                 break;
 623         case BGPPEERKEEPALIVECONFIGURED:
 624                 *write_method = write_bgpPeerTable;
 625                 if (PEER_OR_GROUP_TIMER_SET(peer))
 626                         return SNMP_INTEGER(peer->keepalive);
 627                 else
 628                         return SNMP_INTEGER(peer->v_keepalive);
 629                 break;
 630         case BGPPEERMINROUTEADVERTISEMENTINTERVAL:
 631                 *write_method = write_bgpPeerTable;
 632                 return SNMP_INTEGER(peer->v_routeadv);
 633                 break;
 634         case BGPPEERINUPDATEELAPSEDTIME:
 635                 if (peer->update_time == 0)
 636                         return SNMP_INTEGER(0);
 637                 else
 638                         return SNMP_INTEGER(bgp_clock() - peer->update_time);
 639                 break;
 640         default:
 641                 return NULL;
 642                 break;
 643         }
 644         return NULL;
 645 }
 646
 647 static u_char *bgpIdentifier(struct variable *v, oid name[], size_t *length,
 648                              int exact, size_t *var_len,
 649                              WriteMethod **write_method)
 650 {
 651         struct bgp *bgp;
 652
 653         if (smux_header_generic(v, name, length, exact, var_len, write_method)
 654             == MATCH_FAILED)
 655                 return NULL;
 656
 657         bgp = bgp_get_default();
 658         if (!bgp)
 659                 return NULL;
 660
 661         return SNMP_IPADDRESS(bgp->router_id);
 662 }
 663
 664 static u_char *bgpRcvdPathAttrTable(struct variable *v, oid name[],
 665                                     size_t *length, int exact, size_t *var_len,
 666                                     WriteMethod **write_method)
 667 {
 668         /* Received Path Attribute Table.  This table contains, one entry
 669            per path to a network, path attributes received from all peers
 670            running BGP version 3 or less.  This table is obsolete, having
 671            been replaced in functionality with the bgp4PathAttrTable.  */
 672         return NULL;
 673 }
 674
 675 static struct bgp_info *bgp4PathAttrLookup(struct variable *v, oid name[],
 676                                            size_t *length, struct bgp *bgp,
 677                                            struct prefix_ipv4 *addr, int exact)
 678 {
 679         oid *offset;
 680         int offsetlen;
 681         struct bgp_info *binfo;
 682         struct bgp_info *min;
 683         struct bgp_node *rn;
 684         union sockunion su;
 685         unsigned int len;
 686         struct in_addr paddr;
 687
 688         sockunion_init(&su);
 689
 690 #define BGP_PATHATTR_ENTRY_OFFSET (IN_ADDR_SIZE + 1 + IN_ADDR_SIZE)
 691
 692         if (exact) {
 693                 if (*length - v->namelen != BGP_PATHATTR_ENTRY_OFFSET)
 694                         return NULL;
 695
 696                 /* Set OID offset for prefix. */
 697                 offset = name + v->namelen;
 698                 oid2in_addr(offset, IN_ADDR_SIZE, &addr->prefix);
 699                 offset += IN_ADDR_SIZE;
 700
 701                 /* Prefix length. */
 702                 addr->prefixlen = *offset;
 703                 offset++;
 704
 705                 /* Peer address. */
 706                 su.sin.sin_family = AF_INET;
 707                 oid2in_addr(offset, IN_ADDR_SIZE, &su.sin.sin_addr);
 708
 709                 /* Lookup node. */
 710                 rn = bgp_node_lookup(bgp->rib[AFI_IP][SAFI_UNICAST],
 711                                      (struct prefix *)addr);
 712                 if (rn) {
 713                         bgp_unlock_node(rn);
 714
 715                         for (binfo = rn->info; binfo; binfo = binfo->next)
 716                                 if (sockunion_same(&binfo->peer->su, &su))
 717                                         return binfo;
 718                 }
 719         } else {
 720                 offset = name + v->namelen;
 721                 offsetlen = *length - v->namelen;
 722                 len = offsetlen;
 723
 724                 if (offsetlen == 0)
 725                         rn = bgp_table_top(bgp->rib[AFI_IP][SAFI_UNICAST]);
 726                 else {
 727                         if (len > IN_ADDR_SIZE)
 728                                 len = IN_ADDR_SIZE;
 729
 730                         oid2in_addr(offset, len, &addr->prefix);
 731
 732                         offset += IN_ADDR_SIZE;
 733                         offsetlen -= IN_ADDR_SIZE;
 734
 735                         if (offsetlen > 0)
 736                                 addr->prefixlen = *offset;
 737                         else
 738                                 addr->prefixlen = len * 8;
 739
 740                         rn = bgp_node_get(bgp->rib[AFI_IP][SAFI_UNICAST],
 741                                           (struct prefix *)addr);
 742
 743                         offset++;
 744                         offsetlen--;
 745                 }
 746
 747                 if (offsetlen > 0) {
 748                         len = offsetlen;
 749                         if (len > IN_ADDR_SIZE)
 750                                 len = IN_ADDR_SIZE;
 751
 752                         oid2in_addr(offset, len, &paddr);
 753                 } else
 754                         paddr.s_addr = 0;
 755
 756                 if (!rn)
 757                         return NULL;
 758
 759                 do {
 760                         min = NULL;
 761
 762                         for (binfo = rn->info; binfo; binfo = binfo->next) {
 763                                 if (binfo->peer->su.sin.sin_family == AF_INET
 764                                     && ntohl(paddr.s_addr)
 765                                                < ntohl(binfo->peer->su.sin
 766                                                                .sin_addr
 767                                                                .s_addr)) {
 768                                         if (min) {
 769                                                 if (ntohl(binfo->peer->su.sin
 770                                                                   .sin_addr
 771                                                                   .s_addr)
 772                                                     < ntohl(min->peer->su.sin
 773                                                                     .sin_addr
 774                                                                     .s_addr))
 775                                                         min = binfo;
 776                                         } else
 777                                                 min = binfo;
 778                                 }
 779                         }
 780
 781                         if (min) {
 782                                 *length =
 783                                         v->namelen + BGP_PATHATTR_ENTRY_OFFSET;
 784
 785                                 offset = name + v->namelen;
 786                                 oid_copy_addr(offset, &rn->p.u.prefix4,
 787                                               IN_ADDR_SIZE);
 788                                 offset += IN_ADDR_SIZE;
 789                                 *offset = rn->p.prefixlen;
 790                                 offset++;
 791                                 oid_copy_addr(offset,
 792                                               &min->peer->su.sin.sin_addr,
 793                                               IN_ADDR_SIZE);
 794                                 addr->prefix = rn->p.u.prefix4;
 795                                 addr->prefixlen = rn->p.prefixlen;
 796
 797                                 bgp_unlock_node(rn);
 798
 799                                 return min;
 800                         }
 801
 802                         paddr.s_addr = 0;
 803                 } while ((rn = bgp_route_next(rn)) != NULL);
 804         }
 805         return NULL;
 806 }
 807
 808 static u_char *bgp4PathAttrTable(struct variable *v, oid name[], size_t *length,
 809                                  int exact, size_t *var_len,
 810                                  WriteMethod **write_method)
 811 {
 812         struct bgp *bgp;
 813         struct bgp_info *binfo;
 814         struct prefix_ipv4 addr;
 815
 816         bgp = bgp_get_default();
 817         if (!bgp)
 818                 return NULL;
 819
 820         if (smux_header_table(v, name, length, exact, var_len, write_method)
 821             == MATCH_FAILED)
 822                 return NULL;
 823         memset(&addr, 0, sizeof(struct prefix_ipv4));
 824
 825         binfo = bgp4PathAttrLookup(v, name, length, bgp, &addr, exact);
 826         if (!binfo)
 827                 return NULL;
 828
 829         switch (v->magic) {
 830         case BGP4PATHATTRPEER: /* 1 */
 831                 return SNMP_IPADDRESS(binfo->peer->su.sin.sin_addr);
 832                 break;
 833         case BGP4PATHATTRIPADDRPREFIXLEN: /* 2 */
 834                 return SNMP_INTEGER(addr.prefixlen);
 835                 break;
 836         case BGP4PATHATTRIPADDRPREFIX: /* 3 */
 837                 return SNMP_IPADDRESS(addr.prefix);
 838                 break;
 839         case BGP4PATHATTRORIGIN: /* 4 */
 840                 return SNMP_INTEGER(binfo->attr->origin);
 841                 break;
 842         case BGP4PATHATTRASPATHSEGMENT: /* 5 */
 843                 return aspath_snmp_pathseg(binfo->attr->aspath, var_len);
 844                 break;
 845         case BGP4PATHATTRNEXTHOP: /* 6 */
 846                 return SNMP_IPADDRESS(binfo->attr->nexthop);
 847                 break;
 848         case BGP4PATHATTRMULTIEXITDISC: /* 7 */
 849                 return SNMP_INTEGER(binfo->attr->med);
 850                 break;
 851         case BGP4PATHATTRLOCALPREF: /* 8 */
 852                 return SNMP_INTEGER(binfo->attr->local_pref);
 853                 break;
 854         case BGP4PATHATTRATOMICAGGREGATE: /* 9 */
 855                 return SNMP_INTEGER(1);
 856                 break;
 857         case BGP4PATHATTRAGGREGATORAS: /* 10 */
 858                 return SNMP_INTEGER(binfo->attr->aggregator_as);
 859                 break;
 860         case BGP4PATHATTRAGGREGATORADDR: /* 11 */
 861                 return SNMP_IPADDRESS(binfo->attr->aggregator_addr);
 862                 break;
 863         case BGP4PATHATTRCALCLOCALPREF: /* 12 */
 864                 return SNMP_INTEGER(-1);
 865                 break;
 866         case BGP4PATHATTRBEST: /* 13 */
 867                                /* $FRR indent$ */
 868                                /* clang-format off */
 869 #define BGP4_PathAttrBest_false 1
 870 #define BGP4_PathAttrBest_true  2
 871                 if (CHECK_FLAG(binfo->flags, BGP_INFO_SELECTED))
 872                         return SNMP_INTEGER(BGP4_PathAttrBest_true);
 873                 else
 874                         return SNMP_INTEGER(BGP4_PathAttrBest_false);
 875                 break;
 876         case BGP4PATHATTRUNKNOWN: /* 14 */
 877                 *var_len = 0;
 878                 return NULL;
 879                 break;
 880         }
 881         return NULL;
 882 }
 883
 884 /* BGP Traps. */
 885 static struct trap_object bgpTrapList[] = {{3, {3, 1, BGPPEERLASTERROR}},
 886                                            {3, {3, 1, BGPPEERSTATE}}};
 887
 888 static int bgpTrapEstablished(struct peer *peer)
 889 {
 890         int ret;
 891         struct in_addr addr;
 892         oid index[sizeof(oid) * IN_ADDR_SIZE];
 893
 894         ret = inet_aton(peer->host, &addr);
 895         if (ret == 0)
 896                 return 0;
 897
 898         oid_copy_addr(index, &addr, IN_ADDR_SIZE);
 899
 900         smux_trap(bgp_variables, sizeof bgp_variables / sizeof(struct variable),
 901                   bgp_trap_oid, sizeof bgp_trap_oid / sizeof(oid), bgp_oid,
 902                   sizeof bgp_oid / sizeof(oid), index, IN_ADDR_SIZE,
 903                   bgpTrapList, sizeof bgpTrapList / sizeof(struct trap_object),
 904                   BGPESTABLISHED);
 905         return 0;
 906 }
 907
 908 static int bgpTrapBackwardTransition(struct peer *peer)
 909 {
 910         int ret;
 911         struct in_addr addr;
 912         oid index[sizeof(oid) * IN_ADDR_SIZE];
 913
 914         ret = inet_aton(peer->host, &addr);
 915         if (ret == 0)
 916                 return 0;
 917
 918         oid_copy_addr(index, &addr, IN_ADDR_SIZE);
 919
 920         smux_trap(bgp_variables, sizeof bgp_variables / sizeof(struct variable),
 921                   bgp_trap_oid, sizeof bgp_trap_oid / sizeof(oid), bgp_oid,
 922                   sizeof bgp_oid / sizeof(oid), index, IN_ADDR_SIZE,
 923                   bgpTrapList, sizeof bgpTrapList / sizeof(struct trap_object),
 924                   BGPBACKWARDTRANSITION);
 925         return 0;
 926 }
 927
 928 static int bgp_snmp_init(struct thread_master *tm)
 929 {
 930         smux_init(tm);
 931         REGISTER_MIB("mibII/bgp", bgp_variables, variable, bgp_oid);
 932         return 0;
 933 }
 934
 935 static int bgp_snmp_module_init(void)
 936 {
 937         hook_register(peer_established, bgpTrapEstablished);
 938         hook_register(peer_backward_transition, bgpTrapBackwardTransition);
 939         hook_register(frr_late_init, bgp_snmp_init);
 940         return 0;
 941 }
 942
 943 FRR_MODULE_SETUP(.name = "bgpd_snmp", .version = FRR_VERSION,
 944                  .description = "bgpd AgentX SNMP module",
 945                  .init = bgp_snmp_module_init)