ripd/rip_snmp.c

   1 /* RIP SNMP support
   2  * Copyright (C) 1999 Kunihiro Ishiguro <kunihiro@zebra.org>
   3  *
   4  * This file is part of GNU Zebra.
   5  *
   6  * GNU Zebra is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License as published by the
   8  * Free Software Foundation; either version 2, or (at your option) any
   9  * later version.
  10  *
  11  * GNU Zebra is distributed in the hope that it will be useful, but
  12  * WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with GNU Zebra; see the file COPYING.  If not, write to the Free
  18  * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
  19  * 02111-1307, USA.
  20  */
  21
  22 #include <zebra.h>
  23
  24 #ifdef HAVE_SNMP
  25 #ifdef HAVE_NETSNMP
  26 #include <net-snmp/net-snmp-config.h>
  27 #endif
  28 #include <asn1.h>
  29 #include <snmp.h>
  30 #include <snmp_impl.h>
  31
  32 #include "if.h"
  33 #include "log.h"
  34 #include "prefix.h"
  35 #include "command.h"
  36 #include "table.h"
  37 #include "smux.h"
  38
  39 #include "ripd/ripd.h"
  40 \f
  41 /* RIPv2-MIB. */
  42 #define RIPV2MIB 1,3,6,1,2,1,23
  43
  44 /* RIPv2-MIB rip2Globals values. */
  45 #define RIP2GLOBALROUTECHANGES  1
  46 #define RIP2GLOBALQUERIES       2
  47
  48 /* RIPv2-MIB rip2IfStatEntry. */
  49 #define RIP2IFSTATENTRY         1
  50
  51 /* RIPv2-MIB rip2IfStatTable. */
  52 #define RIP2IFSTATADDRESS       1
  53 #define RIP2IFSTATRCVBADPACKETS 2
  54 #define RIP2IFSTATRCVBADROUTES  3
  55 #define RIP2IFSTATSENTUPDATES   4
  56 #define RIP2IFSTATSTATUS        5
  57
  58 /* RIPv2-MIB rip2IfConfTable. */
  59 #define RIP2IFCONFADDRESS       1
  60 #define RIP2IFCONFDOMAIN        2
  61 #define RIP2IFCONFAUTHTYPE      3
  62 #define RIP2IFCONFAUTHKEY       4
  63 #define RIP2IFCONFSEND          5
  64 #define RIP2IFCONFRECEIVE       6
  65 #define RIP2IFCONFDEFAULTMETRIC 7
  66 #define RIP2IFCONFSTATUS        8
  67 #define RIP2IFCONFSRCADDRESS    9
  68
  69 /* RIPv2-MIB rip2PeerTable. */
  70 #define RIP2PEERADDRESS         1
  71 #define RIP2PEERDOMAIN          2
  72 #define RIP2PEERLASTUPDATE      3
  73 #define RIP2PEERVERSION         4
  74 #define RIP2PEERRCVBADPACKETS   5
  75 #define RIP2PEERRCVBADROUTES    6
  76
  77 /* SNMP value hack. */
  78 #define COUNTER     ASN_COUNTER
  79 #define INTEGER     ASN_INTEGER
  80 #define TIMETICKS   ASN_TIMETICKS
  81 #define IPADDRESS   ASN_IPADDRESS
  82 #define STRING      ASN_OCTET_STR
  83 \f
  84 /* Define SNMP local variables. */
  85 SNMP_LOCAL_VARIABLES
  86
  87 /* RIP-MIB instances. */
  88 oid rip_oid [] = { RIPV2MIB };
  89
  90 /* Interface cache table sorted by interface's address. */
  91 struct route_table *rip_ifaddr_table;
  92
  93 /* Hook functions. */
  94 static u_char *rip2Globals ();
  95 static u_char *rip2IfStatEntry ();
  96 static u_char *rip2IfConfAddress ();
  97 static u_char *rip2PeerTable ();
  98
  99 struct variable rip_variables[] =
 100 {
 101   /* RIP Global Counters. */
 102   {RIP2GLOBALROUTECHANGES,    COUNTER, RONLY, rip2Globals,
 103    2, {1, 1}},
 104   {RIP2GLOBALQUERIES,         COUNTER, RONLY, rip2Globals,
 105    2, {1, 2}},
 106   /* RIP Interface Tables. */
 107   {RIP2IFSTATADDRESS,         IPADDRESS, RONLY, rip2IfStatEntry,
 108    3, {2, 1, 1}},
 109   {RIP2IFSTATRCVBADPACKETS,   COUNTER, RONLY, rip2IfStatEntry,
 110    3, {2, 1, 2}},
 111   {RIP2IFSTATRCVBADROUTES,    COUNTER, RONLY, rip2IfStatEntry,
 112    3, {2, 1, 3}},
 113   {RIP2IFSTATSENTUPDATES,     COUNTER, RONLY, rip2IfStatEntry,
 114    3, {2, 1, 4}},
 115   {RIP2IFSTATSTATUS,          COUNTER, RWRITE, rip2IfStatEntry,
 116    3, {2, 1, 5}},
 117   {RIP2IFCONFADDRESS,         IPADDRESS, RONLY, rip2IfConfAddress,
 118    /* RIP Interface Configuration Table. */
 119    3, {3, 1, 1}},
 120   {RIP2IFCONFDOMAIN,          STRING, RONLY, rip2IfConfAddress,
 121    3, {3, 1, 2}},
 122   {RIP2IFCONFAUTHTYPE,        COUNTER, RONLY, rip2IfConfAddress,
 123    3, {3, 1, 3}},
 124   {RIP2IFCONFAUTHKEY,         STRING, RONLY, rip2IfConfAddress,
 125    3, {3, 1, 4}},
 126   {RIP2IFCONFSEND,            COUNTER, RONLY, rip2IfConfAddress,
 127    3, {3, 1, 5}},
 128   {RIP2IFCONFRECEIVE,         COUNTER, RONLY, rip2IfConfAddress,
 129    3, {3, 1, 6}},
 130   {RIP2IFCONFDEFAULTMETRIC,   COUNTER, RONLY, rip2IfConfAddress,
 131    3, {3, 1, 7}},
 132   {RIP2IFCONFSTATUS,          COUNTER, RONLY, rip2IfConfAddress,
 133    3, {3, 1, 8}},
 134   {RIP2IFCONFSRCADDRESS,      IPADDRESS, RONLY, rip2IfConfAddress,
 135    3, {3, 1, 9}},
 136   {RIP2PEERADDRESS,           IPADDRESS, RONLY, rip2PeerTable,
 137    /* RIP Peer Table. */
 138    3, {4, 1, 1}},
 139   {RIP2PEERDOMAIN,            STRING, RONLY, rip2PeerTable,
 140    3, {4, 1, 2}},
 141   {RIP2PEERLASTUPDATE,        TIMETICKS, RONLY, rip2PeerTable,
 142    3, {4, 1, 3}},
 143   {RIP2PEERVERSION,           INTEGER, RONLY, rip2PeerTable,
 144    3, {4, 1, 4}},
 145   {RIP2PEERRCVBADPACKETS,     COUNTER, RONLY, rip2PeerTable,
 146    3, {4, 1, 5}},
 147   {RIP2PEERRCVBADROUTES,      COUNTER, RONLY, rip2PeerTable,
 148    3, {4, 1, 6}}
 149 };
 150
 151 extern struct thread_master *master;
 152 \f
 153 static u_char *
 154 rip2Globals (struct variable *v, oid name[], size_t *length,
 155              int exact, size_t *var_len, WriteMethod **write_method)
 156 {
 157   if (smux_header_generic(v, name, length, exact, var_len, write_method)
 158       == MATCH_FAILED)
 159     return NULL;
 160
 161   /* Retrun global counter. */
 162   switch (v->magic)
 163     {
 164     case RIP2GLOBALROUTECHANGES:
 165       return SNMP_INTEGER (rip_global_route_changes);
 166       break;
 167     case RIP2GLOBALQUERIES:
 168       return SNMP_INTEGER (rip_global_queries);
 169       break;
 170     default:
 171       return NULL;
 172       break;
 173     }
 174   return NULL;
 175 }
 176
 177 void
 178 rip_ifaddr_add (struct interface *ifp, struct connected *ifc)
 179 {
 180   struct prefix *p;
 181   struct route_node *rn;
 182
 183   p = ifc->address;
 184
 185   if (p->family != AF_INET)
 186     return;
 187
 188   rn = route_node_get (rip_ifaddr_table, p);
 189   rn->info = ifp;
 190 }
 191
 192 void
 193 rip_ifaddr_delete (struct interface *ifp, struct connected *ifc)
 194 {
 195   struct prefix *p;
 196   struct route_node *rn;
 197   struct interface *i;
 198
 199   p = ifc->address;
 200
 201   if (p->family != AF_INET)
 202     return;
 203
 204   rn = route_node_lookup (rip_ifaddr_table, p);
 205   if (! rn)
 206     return;
 207   i = rn->info;
 208   if (rn && !strncmp(i->name,ifp->name,INTERFACE_NAMSIZ))
 209     {
 210       rn->info = NULL;
 211       route_unlock_node (rn);
 212       route_unlock_node (rn);
 213     }
 214 }
 215
 216 struct interface *
 217 rip_ifaddr_lookup_next (struct in_addr *addr)
 218 {
 219   struct prefix_ipv4 p;
 220   struct route_node *rn;
 221   struct interface *ifp;
 222
 223   p.family = AF_INET;
 224   p.prefixlen = IPV4_MAX_BITLEN;
 225   p.prefix = *addr;
 226
 227   rn = route_node_get (rip_ifaddr_table, (struct prefix *) &p);
 228
 229   for (rn = route_next (rn); rn; rn = route_next (rn))
 230     if (rn->info)
 231       break;
 232
 233   if (rn && rn->info)
 234     {
 235       ifp = rn->info;
 236       *addr = rn->p.u.prefix4;
 237       route_unlock_node (rn);
 238       return ifp;
 239     }
 240   return NULL;
 241 }
 242
 243 static struct interface *
 244 rip2IfLookup (struct variable *v, oid name[], size_t *length,
 245               struct in_addr *addr, int exact)
 246 {
 247   int len;
 248   struct interface *ifp;
 249
 250   if (exact)
 251     {
 252       /* Check the length. */
 253       if (*length - v->namelen != sizeof (struct in_addr))
 254         return NULL;
 255
 256       oid2in_addr (name + v->namelen, sizeof (struct in_addr), addr);
 257
 258       return if_lookup_exact_address (*addr);
 259     }
 260   else
 261     {
 262       len = *length - v->namelen;
 263       if (len > 4) len = 4;
 264
 265       oid2in_addr (name + v->namelen, len, addr);
 266
 267       ifp = rip_ifaddr_lookup_next (addr);
 268
 269       if (ifp == NULL)
 270         return NULL;
 271
 272       oid_copy_addr (name + v->namelen, addr, sizeof (struct in_addr));
 273
 274       *length = v->namelen + sizeof (struct in_addr);
 275
 276       return ifp;
 277     }
 278   return NULL;
 279 }
 280
 281 static struct rip_peer *
 282 rip2PeerLookup (struct variable *v, oid name[], size_t *length,
 283                 struct in_addr *addr, int exact)
 284 {
 285   int len;
 286   struct rip_peer *peer;
 287
 288   if (exact)
 289     {
 290       /* Check the length. */
 291       if (*length - v->namelen != sizeof (struct in_addr) + 1)
 292         return NULL;
 293
 294       oid2in_addr (name + v->namelen, sizeof (struct in_addr), addr);
 295
 296       peer = rip_peer_lookup (addr);
 297
 298       if (peer->domain == name[v->namelen + sizeof (struct in_addr)])
 299         return peer;
 300
 301       return NULL;
 302     }
 303   else
 304     {
 305       len = *length - v->namelen;
 306       if (len > 4) len = 4;
 307
 308       oid2in_addr (name + v->namelen, len, addr);
 309
 310       len = *length - v->namelen;
 311       peer = rip_peer_lookup (addr);
 312       if (peer)
 313         {
 314           if ((len < sizeof (struct in_addr) + 1) ||
 315               (peer->domain > name[v->namelen + sizeof (struct in_addr)]))
 316             {
 317               oid_copy_addr (name + v->namelen, &peer->addr,
 318                              sizeof (struct in_addr));
 319               name[v->namelen + sizeof (struct in_addr)] = peer->domain;
 320               *length = sizeof (struct in_addr) + v->namelen + 1;
 321               return peer;
 322             }
 323         }
 324       peer = rip_peer_lookup_next (addr);
 325
 326       if (! peer)
 327         return NULL;
 328
 329       oid_copy_addr (name + v->namelen, &peer->addr,
 330                      sizeof (struct in_addr));
 331       name[v->namelen + sizeof (struct in_addr)] = peer->domain;
 332       *length = sizeof (struct in_addr) + v->namelen + 1;
 333
 334       return peer;
 335     }
 336   return NULL;
 337 }
 338
 339 static u_char *
 340 rip2IfStatEntry (struct variable *v, oid name[], size_t *length,
 341                  int exact, size_t *var_len, WriteMethod **write_method)
 342 {
 343   struct interface *ifp;
 344   struct rip_interface *ri;
 345   static struct in_addr addr;
 346   static long valid = SNMP_VALID;
 347
 348   memset (&addr, 0, sizeof (struct in_addr));
 349
 350   /* Lookup interface. */
 351   ifp = rip2IfLookup (v, name, length, &addr, exact);
 352   if (! ifp)
 353     return NULL;
 354
 355   /* Fetch rip_interface information. */
 356   ri = ifp->info;
 357
 358   switch (v->magic)
 359     {
 360     case RIP2IFSTATADDRESS:
 361       return SNMP_IPADDRESS (addr);
 362       break;
 363     case RIP2IFSTATRCVBADPACKETS:
 364       *var_len = sizeof (long);
 365       return (u_char *) &ri->recv_badpackets;
 366
 367     case RIP2IFSTATRCVBADROUTES:
 368       *var_len = sizeof (long);
 369       return (u_char *) &ri->recv_badroutes;
 370
 371     case RIP2IFSTATSENTUPDATES:
 372       *var_len = sizeof (long);
 373       return (u_char *) &ri->sent_updates;
 374
 375     case RIP2IFSTATSTATUS:
 376       *var_len = sizeof (long);
 377       v->type = ASN_INTEGER;
 378       return (u_char *) &valid;
 379
 380     default:
 381       return NULL;
 382
 383     }
 384   return NULL;
 385 }
 386
 387 static long
 388 rip2IfConfSend (struct rip_interface *ri)
 389 {
 390 #define doNotSend       1
 391 #define ripVersion1     2
 392 #define rip1Compatible  3
 393 #define ripVersion2     4
 394 #define ripV1Demand     5
 395 #define ripV2Demand     6
 396
 397   if (! ri->running)
 398     return doNotSend;
 399
 400   if (ri->ri_send & RIPv2)
 401     return ripVersion2;
 402   else if (ri->ri_send & RIPv1)
 403     return ripVersion1;
 404   else if (rip)
 405     {
 406       if (rip->version_send == RIPv2)
 407         return ripVersion2;
 408       else if (rip->version_send == RIPv1)
 409         return ripVersion1;
 410     }
 411   return doNotSend;
 412 }
 413
 414 static long
 415 rip2IfConfReceive (struct rip_interface *ri)
 416 {
 417 #define rip1            1
 418 #define rip2            2
 419 #define rip1OrRip2      3
 420 #define doNotReceive    4
 421
 422   int recvv;
 423
 424   if (! ri->running)
 425     return doNotReceive;
 426
 427   recvv = (ri->ri_receive == RI_RIP_UNSPEC) ?  rip->version_recv :
 428                                                ri->ri_receive;
 429   if (recvv == RI_RIP_VERSION_1_AND_2)
 430     return rip1OrRip2;
 431   else if (recvv & RIPv2)
 432     return rip2;
 433   else if (recvv & RIPv1)
 434     return rip1;
 435   else
 436     return doNotReceive;
 437 }
 438
 439 static u_char *
 440 rip2IfConfAddress (struct variable *v, oid name[], size_t *length,
 441                    int exact, size_t *val_len, WriteMethod **write_method)
 442 {
 443   static struct in_addr addr;
 444   static long valid = SNMP_INVALID;
 445   static long domain = 0;
 446   static long config = 0;
 447   static u_int auth = 0;
 448   struct interface *ifp;
 449   struct rip_interface *ri;
 450
 451   memset (&addr, 0, sizeof (struct in_addr));
 452
 453   /* Lookup interface. */
 454   ifp = rip2IfLookup (v, name, length, &addr, exact);
 455   if (! ifp)
 456     return NULL;
 457
 458   /* Fetch rip_interface information. */
 459   ri = ifp->info;
 460
 461   switch (v->magic)
 462     {
 463     case RIP2IFCONFADDRESS:
 464       *val_len = sizeof (struct in_addr);
 465       return (u_char *) &addr;
 466
 467     case RIP2IFCONFDOMAIN:
 468       *val_len = 2;
 469       return (u_char *) &domain;
 470
 471     case RIP2IFCONFAUTHTYPE:
 472       auth = ri->auth_type;
 473       *val_len = sizeof (long);
 474       v->type = ASN_INTEGER;
 475       return (u_char *)&auth;
 476
 477     case RIP2IFCONFAUTHKEY:
 478       *val_len = 0;
 479       return (u_char *) &domain;
 480     case RIP2IFCONFSEND:
 481       config = rip2IfConfSend (ri);
 482       *val_len = sizeof (long);
 483       v->type = ASN_INTEGER;
 484       return (u_char *) &config;
 485     case RIP2IFCONFRECEIVE:
 486       config = rip2IfConfReceive (ri);
 487       *val_len = sizeof (long);
 488       v->type = ASN_INTEGER;
 489       return (u_char *) &config;
 490
 491     case RIP2IFCONFDEFAULTMETRIC:
 492       *val_len = sizeof (long);
 493       v->type = ASN_INTEGER;
 494       return (u_char *) &ifp->metric;
 495     case RIP2IFCONFSTATUS:
 496       *val_len = sizeof (long);
 497       v->type = ASN_INTEGER;
 498       return (u_char *) &valid;
 499     case RIP2IFCONFSRCADDRESS:
 500       *val_len = sizeof (struct in_addr);
 501       return (u_char *) &addr;
 502
 503     default:
 504       return NULL;
 505
 506     }
 507   return NULL;
 508 }
 509
 510 static u_char *
 511 rip2PeerTable (struct variable *v, oid name[], size_t *length,
 512                int exact, size_t *val_len, WriteMethod **write_method)
 513 {
 514   static struct in_addr addr;
 515   static int domain = 0;
 516   static int version;
 517   /* static time_t uptime; */
 518
 519   struct rip_peer *peer;
 520
 521   memset (&addr, 0, sizeof (struct in_addr));
 522
 523   /* Lookup interface. */
 524   peer = rip2PeerLookup (v, name, length, &addr, exact);
 525   if (! peer)
 526     return NULL;
 527
 528   switch (v->magic)
 529     {
 530     case RIP2PEERADDRESS:
 531       *val_len = sizeof (struct in_addr);
 532       return (u_char *) &peer->addr;
 533
 534     case RIP2PEERDOMAIN:
 535       *val_len = 2;
 536       return (u_char *) &domain;
 537
 538     case RIP2PEERLASTUPDATE:
 539 #if 0
 540       /* We don't know the SNMP agent startup time. We have two choices here:
 541        * - assume ripd startup time equals SNMP agent startup time
 542        * - don't support this variable, at all
 543        * Currently, we do the latter...
 544        */
 545       *val_len = sizeof (time_t);
 546       uptime = peer->uptime; /* now - snmp_agent_startup - peer->uptime */
 547       return (u_char *) &uptime;
 548 #else
 549       return (u_char *) NULL;
 550 #endif
 551
 552     case RIP2PEERVERSION:
 553       *val_len = sizeof (int);
 554       version = peer->version;
 555       return (u_char *) &version;
 556
 557     case RIP2PEERRCVBADPACKETS:
 558       *val_len = sizeof (int);
 559       return (u_char *) &peer->recv_badpackets;
 560
 561     case RIP2PEERRCVBADROUTES:
 562       *val_len = sizeof (int);
 563       return (u_char *) &peer->recv_badroutes;
 564
 565     default:
 566       return NULL;
 567
 568     }
 569   return NULL;
 570 }
 571
 572 /* Register RIPv2-MIB. */
 573 void
 574 rip_snmp_init ()
 575 {
 576   rip_ifaddr_table = route_table_init ();
 577
 578   smux_init (master);
 579   REGISTER_MIB("mibII/rip", rip_variables, variable, rip_oid);
 580 }
 581 #endif /* HAVE_SNMP */