bgp_snmp.c
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上传日期:2009-11-15
资源大小:1338k
文件大小:24k
- /* BGP4 SNMP support
- Copyright (C) 1999, 2000 Kunihiro Ishiguro
- This file is part of GNU Zebra.
- GNU Zebra is free software; you can redistribute it and/or modify it
- under the terms of the GNU General Public License as published by the
- Free Software Foundation; either version 2, or (at your option) any
- later version.
- GNU Zebra is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- General Public License for more details.
- You should have received a copy of the GNU General Public License
- along with GNU Zebra; see the file COPYING. If not, write to the Free
- Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
- 02111-1307, USA. */
- #include <zebra.h>
- #ifdef HAVE_SNMP
- #ifdef HAVE_NETSNMP
- #include <net-snmp/net-snmp-config.h>
- #endif /* HAVE_NETSNMP */
- #include <asn1.h>
- #include <snmp.h>
- #include <snmp_impl.h>
- #include "if.h"
- #include "log.h"
- #include "prefix.h"
- #include "command.h"
- #include "thread.h"
- #include "smux.h"
- #include "bgpd/bgpd.h"
- #include "bgpd/bgp_table.h"
- #include "bgpd/bgp_aspath.h"
- #include "bgpd/bgp_attr.h"
- #include "bgpd/bgp_route.h"
- #include "bgpd/bgp_fsm.h"
- /* BGP4-MIB described in RFC1657. */
- #define BGP4MIB 1,3,6,1,2,1,15
- /* BGP TRAP. */
- #define BGPESTABLISHED 1
- #define BGPBACKWARDTRANSITION 2
- /* Zebra enterprise BGP MIB. This variable is used for register
- OSPF MIB to SNMP agent under SMUX protocol. */
- #define BGPDMIB 1,3,6,1,4,1,3317,1,2,2
- /* BGP MIB bgpVersion. */
- #define BGPVERSION 0
- /* BGP MIB bgpLocalAs. */
- #define BGPLOCALAS 0
- /* BGP MIB bgpPeerTable. */
- #define BGPPEERIDENTIFIER 1
- #define BGPPEERSTATE 2
- #define BGPPEERADMINSTATUS 3
- #define BGPPEERNEGOTIATEDVERSION 4
- #define BGPPEERLOCALADDR 5
- #define BGPPEERLOCALPORT 6
- #define BGPPEERREMOTEADDR 7
- #define BGPPEERREMOTEPORT 8
- #define BGPPEERREMOTEAS 9
- #define BGPPEERINUPDATES 10
- #define BGPPEEROUTUPDATES 11
- #define BGPPEERINTOTALMESSAGES 12
- #define BGPPEEROUTTOTALMESSAGES 13
- #define BGPPEERLASTERROR 14
- #define BGPPEERFSMESTABLISHEDTRANSITIONS 15
- #define BGPPEERFSMESTABLISHEDTIME 16
- #define BGPPEERCONNECTRETRYINTERVAL 17
- #define BGPPEERHOLDTIME 18
- #define BGPPEERKEEPALIVE 19
- #define BGPPEERHOLDTIMECONFIGURED 20
- #define BGPPEERKEEPALIVECONFIGURED 21
- #define BGPPEERMINASORIGINATIONINTERVAL 22
- #define BGPPEERMINROUTEADVERTISEMENTINTERVAL 23
- #define BGPPEERINUPDATEELAPSEDTIME 24
- /* BGP MIB bgpIdentifier. */
- #define BGPIDENTIFIER 0
- /* BGP MIB bgpRcvdPathAttrTable */
- #define BGPPATHATTRPEER 1
- #define BGPPATHATTRDESTNETWORK 2
- #define BGPPATHATTRORIGIN 3
- #define BGPPATHATTRASPATH 4
- #define BGPPATHATTRNEXTHOP 5
- #define BGPPATHATTRINTERASMETRIC 6
- /* BGP MIB bgp4PathAttrTable. */
- #define BGP4PATHATTRPEER 1
- #define BGP4PATHATTRIPADDRPREFIXLEN 2
- #define BGP4PATHATTRIPADDRPREFIX 3
- #define BGP4PATHATTRORIGIN 4
- #define BGP4PATHATTRASPATHSEGMENT 5
- #define BGP4PATHATTRNEXTHOP 6
- #define BGP4PATHATTRMULTIEXITDISC 7
- #define BGP4PATHATTRLOCALPREF 8
- #define BGP4PATHATTRATOMICAGGREGATE 9
- #define BGP4PATHATTRAGGREGATORAS 10
- #define BGP4PATHATTRAGGREGATORADDR 11
- #define BGP4PATHATTRCALCLOCALPREF 12
- #define BGP4PATHATTRBEST 13
- #define BGP4PATHATTRUNKNOWN 14
- /* SNMP value hack. */
- #define INTEGER ASN_INTEGER
- #define INTEGER32 ASN_INTEGER
- #define COUNTER32 ASN_COUNTER
- #define OCTET_STRING ASN_OCTET_STR
- #define IPADDRESS ASN_IPADDRESS
- #define GAUGE32 ASN_UNSIGNED
- /* Declare static local variables for convenience. */
- SNMP_LOCAL_VARIABLES
- /* BGP-MIB instances. */
- oid bgp_oid [] = { BGP4MIB };
- oid bgpd_oid [] = { BGPDMIB };
- /* IP address 0.0.0.0. */
- static struct in_addr bgp_empty_addr = {0};
- /* Hook functions. */
- static u_char *bgpVersion ();
- static u_char *bgpLocalAs ();
- static u_char *bgpPeerTable ();
- static u_char *bgpRcvdPathAttrTable ();
- static u_char *bgpIdentifier ();
- static u_char *bgp4PathAttrTable ();
- /* static u_char *bgpTraps (); */
- struct variable bgp_variables[] =
- {
- /* BGP version. */
- {BGPVERSION, OCTET_STRING, RONLY, bgpVersion,
- 1, {1}},
- /* BGP local AS. */
- {BGPLOCALAS, INTEGER, RONLY, bgpLocalAs,
- 1, {2}},
- /* BGP peer table. */
- {BGPPEERIDENTIFIER, IPADDRESS, RONLY, bgpPeerTable,
- 3, {3, 1, 1}},
- {BGPPEERSTATE, INTEGER, RONLY, bgpPeerTable,
- 3, {3, 1, 2}},
- {BGPPEERADMINSTATUS, INTEGER, RWRITE, bgpPeerTable,
- 3, {3, 1, 3}},
- {BGPPEERNEGOTIATEDVERSION, INTEGER32, RONLY, bgpPeerTable,
- 3, {3, 1, 4}},
- {BGPPEERLOCALADDR, IPADDRESS, RONLY, bgpPeerTable,
- 3, {3, 1, 5}},
- {BGPPEERLOCALPORT, INTEGER, RONLY, bgpPeerTable,
- 3, {3, 1, 6}},
- {BGPPEERREMOTEADDR, IPADDRESS, RONLY, bgpPeerTable,
- 3, {3, 1, 7}},
- {BGPPEERREMOTEPORT, INTEGER, RONLY, bgpPeerTable,
- 3, {3, 1, 8}},
- {BGPPEERREMOTEAS, INTEGER, RONLY, bgpPeerTable,
- 3, {3, 1, 9}},
- {BGPPEERINUPDATES, COUNTER32, RONLY, bgpPeerTable,
- 3, {3, 1, 10}},
- {BGPPEEROUTUPDATES, COUNTER32, RONLY, bgpPeerTable,
- 3, {3, 1, 11}},
- {BGPPEERINTOTALMESSAGES, COUNTER32, RONLY, bgpPeerTable,
- 3, {3, 1, 12}},
- {BGPPEEROUTTOTALMESSAGES, COUNTER32, RONLY, bgpPeerTable,
- 3, {3, 1, 13}},
- {BGPPEERLASTERROR, OCTET_STRING, RONLY, bgpPeerTable,
- 3, {3, 1, 14}},
- {BGPPEERFSMESTABLISHEDTRANSITIONS, COUNTER32, RONLY, bgpPeerTable,
- 3, {3, 1, 15}},
- {BGPPEERFSMESTABLISHEDTIME, GAUGE32, RONLY, bgpPeerTable,
- 3, {3, 1, 16}},
- {BGPPEERCONNECTRETRYINTERVAL, INTEGER, RWRITE, bgpPeerTable,
- 3, {3, 1, 17}},
- {BGPPEERHOLDTIME, INTEGER, RONLY, bgpPeerTable,
- 3, {3, 1, 18}},
- {BGPPEERKEEPALIVE, INTEGER, RONLY, bgpPeerTable,
- 3, {3, 1, 19}},
- {BGPPEERHOLDTIMECONFIGURED, INTEGER, RWRITE, bgpPeerTable,
- 3, {3, 1, 20}},
- {BGPPEERKEEPALIVECONFIGURED, INTEGER, RWRITE, bgpPeerTable,
- 3, {3, 1, 21}},
- {BGPPEERMINASORIGINATIONINTERVAL, INTEGER, RWRITE, bgpPeerTable,
- 3, {3, 1, 22}},
- {BGPPEERMINROUTEADVERTISEMENTINTERVAL, INTEGER, RWRITE, bgpPeerTable,
- 3, {3, 1, 23}},
- {BGPPEERINUPDATEELAPSEDTIME, GAUGE32, RONLY, bgpPeerTable,
- 3, {3, 1, 24}},
- /* BGP identifier. */
- {BGPIDENTIFIER, IPADDRESS, RONLY, bgpIdentifier,
- 1, {4}},
- /* BGP received path attribute table. */
- {BGPPATHATTRPEER, IPADDRESS, RONLY, bgpRcvdPathAttrTable,
- 3, {5, 1, 1}},
- {BGPPATHATTRDESTNETWORK, IPADDRESS, RONLY, bgpRcvdPathAttrTable,
- 3, {5, 1, 2}},
- {BGPPATHATTRORIGIN, INTEGER, RONLY, bgpRcvdPathAttrTable,
- 3, {5, 1, 3}},
- {BGPPATHATTRASPATH, OCTET_STRING, RONLY, bgpRcvdPathAttrTable,
- 3, {5, 1, 4}},
- {BGPPATHATTRNEXTHOP, IPADDRESS, RONLY, bgpRcvdPathAttrTable,
- 3, {5, 1, 5}},
- {BGPPATHATTRINTERASMETRIC, INTEGER32, RONLY, bgpRcvdPathAttrTable,
- 3, {5, 1, 6}},
- /* BGP-4 received path attribute table. */
- {BGP4PATHATTRPEER, IPADDRESS, RONLY, bgp4PathAttrTable,
- 3, {6, 1, 1}},
- {BGP4PATHATTRIPADDRPREFIXLEN, INTEGER, RONLY, bgp4PathAttrTable,
- 3, {6, 1, 2}},
- {BGP4PATHATTRIPADDRPREFIX, IPADDRESS, RONLY, bgp4PathAttrTable,
- 3, {6, 1, 3}},
- {BGP4PATHATTRORIGIN, INTEGER, RONLY, bgp4PathAttrTable,
- 3, {6, 1, 4}},
- {BGP4PATHATTRASPATHSEGMENT, OCTET_STRING, RONLY, bgp4PathAttrTable,
- 3, {6, 1, 5}},
- {BGP4PATHATTRNEXTHOP, IPADDRESS, RONLY, bgp4PathAttrTable,
- 3, {6, 1, 6}},
- {BGP4PATHATTRMULTIEXITDISC, INTEGER, RONLY, bgp4PathAttrTable,
- 3, {6, 1, 7}},
- {BGP4PATHATTRLOCALPREF, INTEGER, RONLY, bgp4PathAttrTable,
- 3, {6, 1, 8}},
- {BGP4PATHATTRATOMICAGGREGATE, INTEGER, RONLY, bgp4PathAttrTable,
- 3, {6, 1, 9}},
- {BGP4PATHATTRAGGREGATORAS, INTEGER, RONLY, bgp4PathAttrTable,
- 3, {6, 1, 10}},
- {BGP4PATHATTRAGGREGATORADDR, IPADDRESS, RONLY, bgp4PathAttrTable,
- 3, {6, 1, 11}},
- {BGP4PATHATTRCALCLOCALPREF, INTEGER, RONLY, bgp4PathAttrTable,
- 3, {6, 1, 12}},
- {BGP4PATHATTRBEST, INTEGER, RONLY, bgp4PathAttrTable,
- 3, {6, 1, 13}},
- {BGP4PATHATTRUNKNOWN, OCTET_STRING, RONLY, bgp4PathAttrTable,
- 3, {6, 1, 14}},
- };
- static u_char *
- bgpVersion (struct variable *v, oid name[], size_t *length, int exact,
- size_t *var_len, WriteMethod **write_method)
- {
- static u_char version;
- if (smux_header_generic(v, name, length, exact, var_len, write_method)
- == MATCH_FAILED)
- return NULL;
- /* Retrun BGP version. Zebra bgpd only support version 4. */
- version = (0x80 >> (BGP_VERSION_4 - 1));
- /* Return octet string length 1. */
- *var_len = 1;
- return (u_char *)&version;
- }
- static u_char *
- bgpLocalAs (struct variable *v, oid name[], size_t *length,
- int exact, size_t *var_len, WriteMethod **write_method)
- {
- struct bgp *bgp;
- if (smux_header_generic(v, name, length, exact, var_len, write_method)
- == MATCH_FAILED)
- return NULL;
- /* Get BGP structure. */
- bgp = bgp_get_default ();
- if (! bgp)
- return NULL;
- return SNMP_INTEGER (bgp->as);
- }
- struct peer *
- peer_lookup_addr_ipv4 (struct in_addr *src)
- {
- struct bgp *bgp;
- struct peer *peer;
- struct listnode *nn;
- struct in_addr addr;
- int ret;
- bgp = bgp_get_default ();
- if (! bgp)
- return NULL;
- LIST_LOOP (bgp->peer, peer, nn)
- {
- ret = inet_pton (AF_INET, peer->host, &addr);
- if (ret > 0)
- {
- if (IPV4_ADDR_SAME (&addr, src))
- return peer;
- }
- }
- return NULL;
- }
- struct peer *
- bgp_peer_lookup_next (struct in_addr *src)
- {
- struct bgp *bgp;
- struct peer *peer;
- struct listnode *nn;
- struct in_addr *p;
- union sockunion su;
- int ret;
- memset (&su, 0, sizeof (union sockunion));
- bgp = bgp_get_default ();
- if (! bgp)
- return NULL;
- LIST_LOOP (bgp->peer, peer, nn)
- {
- ret = inet_pton (AF_INET, peer->host, &su.sin.sin_addr);
- if (ret > 0)
- {
- p = &su.sin.sin_addr;
- if (ntohl (p->s_addr) > ntohl (src->s_addr))
- {
- src->s_addr = p->s_addr;
- return peer;
- }
- }
- }
- return NULL;
- }
- struct peer *
- bgpPeerTable_lookup (struct variable *v, oid name[], size_t *length,
- struct in_addr *addr, int exact)
- {
- struct peer *peer = NULL;
- int len;
- if (exact)
- {
- /* Check the length. */
- if (*length - v->namelen != sizeof (struct in_addr))
- return NULL;
- oid2in_addr (name + v->namelen, IN_ADDR_SIZE, addr);
- peer = peer_lookup_addr_ipv4 (addr);
- return peer;
- }
- else
- {
- len = *length - v->namelen;
- if (len > 4) len = 4;
-
- oid2in_addr (name + v->namelen, len, addr);
-
- peer = bgp_peer_lookup_next (addr);
- if (peer == NULL)
- return NULL;
- oid_copy_addr (name + v->namelen, addr, sizeof (struct in_addr));
- *length = sizeof (struct in_addr) + v->namelen;
- return peer;
- }
- return NULL;
- }
- /* BGP write methods. */
- int
- write_bgpPeerTable (int action, u_char *var_val,
- u_char var_val_type, size_t var_val_len,
- u_char *statP, oid *name, size_t length,
- struct variable *v)
- {
- struct in_addr addr;
- struct peer *peer;
- long intval;
- int bigsize = SNMP_MAX_LEN;
-
- if (var_val_type != ASN_INTEGER)
- {
- return SNMP_ERR_WRONGTYPE;
- }
- if (var_val_len != sizeof (long))
- {
- return SNMP_ERR_WRONGLENGTH;
- }
- if (! asn_parse_int(var_val, &bigsize, &var_val_type,
- &intval, sizeof(long)))
- {
- return SNMP_ERR_WRONGENCODING;
- }
- memset (&addr, 0, sizeof (struct in_addr));
- peer = bgpPeerTable_lookup (v, name, &length, &addr, 1);
- if (! peer)
- return SNMP_ERR_NOSUCHNAME;
- printf ("val: %ldn", intval);
- switch (v->magic)
- {
- case BGPPEERADMINSTATUS:
- #define BGP_PeerAdmin_stop 1
- #define BGP_PeerAdmin_start 2
- /* When the peer is established, */
- if (intval == BGP_PeerAdmin_stop)
- BGP_EVENT_ADD (peer, BGP_Stop);
- else if (intval == BGP_PeerAdmin_start)
- ; /* Do nothing. */
- else
- return SNMP_ERR_NOSUCHNAME;
- break;
- case BGPPEERHOLDTIMECONFIGURED:
- SET_FLAG (peer->config, PEER_CONFIG_TIMER);
- peer->holdtime = intval;
- peer->v_holdtime = intval;
- break;
- case BGPPEERKEEPALIVECONFIGURED:
- SET_FLAG (peer->config, PEER_CONFIG_TIMER);
- peer->keepalive = intval;
- peer->v_keepalive = intval;
- break;
- case BGPPEERMINASORIGINATIONINTERVAL:
- peer->v_asorig = intval;
- break;
- case BGPPEERMINROUTEADVERTISEMENTINTERVAL:
- peer->v_routeadv = intval;
- break;
- }
- return SNMP_ERR_NOERROR;
- }
- u_char *
- bgpPeerTable (struct variable *v, oid name[], size_t *length,
- int exact, size_t *var_len, WriteMethod **write_method)
- {
- static struct in_addr addr;
- struct peer *peer;
- *write_method = NULL;
- memset (&addr, 0, sizeof (struct in_addr));
- peer = bgpPeerTable_lookup (v, name, length, &addr, exact);
- if (! peer)
- return NULL;
- switch (v->magic)
- {
- case BGPPEERIDENTIFIER:
- return SNMP_IPADDRESS (peer->remote_id);
- break;
- case BGPPEERSTATE:
- return SNMP_INTEGER (peer->status);
- break;
- case BGPPEERADMINSTATUS:
- *write_method = write_bgpPeerTable;
- #define BGP_PeerAdmin_stop 1
- #define BGP_PeerAdmin_start 2
- if (CHECK_FLAG (peer->flags, PEER_FLAG_SHUTDOWN))
- return SNMP_INTEGER (BGP_PeerAdmin_stop);
- else
- return SNMP_INTEGER (BGP_PeerAdmin_start);
- break;
- case BGPPEERNEGOTIATEDVERSION:
- return SNMP_INTEGER (BGP_VERSION_4);
- break;
- case BGPPEERLOCALADDR:
- if (peer->su_local)
- return SNMP_IPADDRESS (peer->su_local->sin.sin_addr);
- else
- return SNMP_IPADDRESS (bgp_empty_addr);
- break;
- case BGPPEERLOCALPORT:
- if (peer->su_local)
- return SNMP_INTEGER (ntohs (peer->su_local->sin.sin_port));
- else
- return SNMP_INTEGER (0);
- break;
- case BGPPEERREMOTEADDR:
- if (peer->su_remote)
- return SNMP_IPADDRESS (peer->su_remote->sin.sin_addr);
- else
- return SNMP_IPADDRESS (bgp_empty_addr);
- break;
- case BGPPEERREMOTEPORT:
- if (peer->su_remote)
- return SNMP_INTEGER (ntohs (peer->su_remote->sin.sin_port));
- else
- return SNMP_INTEGER (0);
- break;
- case BGPPEERREMOTEAS:
- return SNMP_INTEGER (peer->as);
- break;
- case BGPPEERINUPDATES:
- return SNMP_INTEGER (peer->update_in);
- break;
- case BGPPEEROUTUPDATES:
- return SNMP_INTEGER (peer->update_out);
- break;
- case BGPPEERINTOTALMESSAGES:
- return SNMP_INTEGER (peer->open_in + peer->update_in
- + peer->keepalive_in + peer->notify_in
- + peer->refresh_in + peer->dynamic_cap_in);
- break;
- case BGPPEEROUTTOTALMESSAGES:
- return SNMP_INTEGER (peer->open_out + peer->update_out
- + peer->keepalive_out + peer->notify_out
- + peer->refresh_out + peer->dynamic_cap_out);
- break;
- case BGPPEERLASTERROR:
- {
- static u_char lasterror[2];
- lasterror[0] = peer->notify.code;
- lasterror[1] = peer->notify.subcode;
- *var_len = 2;
- return (u_char *)&lasterror;
- }
- break;
- case BGPPEERFSMESTABLISHEDTRANSITIONS:
- return SNMP_INTEGER (peer->established);
- break;
- case BGPPEERFSMESTABLISHEDTIME:
- if (peer->uptime == 0)
- return SNMP_INTEGER (0);
- else
- return SNMP_INTEGER (time (NULL) - peer->uptime);
- break;
- case BGPPEERCONNECTRETRYINTERVAL:
- *write_method = write_bgpPeerTable;
- return SNMP_INTEGER (peer->v_connect);
- break;
- case BGPPEERHOLDTIME:
- return SNMP_INTEGER (peer->v_holdtime);
- break;
- case BGPPEERKEEPALIVE:
- return SNMP_INTEGER (peer->v_keepalive);
- break;
- case BGPPEERHOLDTIMECONFIGURED:
- *write_method = write_bgpPeerTable;
- if (CHECK_FLAG (peer->config, PEER_CONFIG_TIMER))
- return SNMP_INTEGER (peer->holdtime);
- else
- return SNMP_INTEGER (peer->v_holdtime);
- break;
- case BGPPEERKEEPALIVECONFIGURED:
- *write_method = write_bgpPeerTable;
- if (CHECK_FLAG (peer->config, PEER_CONFIG_TIMER))
- return SNMP_INTEGER (peer->keepalive);
- else
- return SNMP_INTEGER (peer->v_keepalive);
- break;
- case BGPPEERMINASORIGINATIONINTERVAL:
- *write_method = write_bgpPeerTable;
- return SNMP_INTEGER (peer->v_asorig);
- break;
- case BGPPEERMINROUTEADVERTISEMENTINTERVAL:
- *write_method = write_bgpPeerTable;
- return SNMP_INTEGER (peer->v_routeadv);
- break;
- case BGPPEERINUPDATEELAPSEDTIME:
- if (peer->update_time == 0)
- return SNMP_INTEGER (0);
- else
- return SNMP_INTEGER (time (NULL) - peer->update_time);
- break;
- default:
- return NULL;
- break;
- }
- return NULL;
- }
- u_char *
- bgpIdentifier (struct variable *v, oid name[], size_t *length,
- int exact, size_t *var_len, WriteMethod **write_method)
- {
- struct bgp *bgp;
- if (smux_header_generic(v, name, length, exact, var_len, write_method)
- == MATCH_FAILED)
- return NULL;
- bgp = bgp_get_default ();
- if (!bgp)
- return NULL;
- return SNMP_IPADDRESS (bgp->router_id);
- }
- u_char *
- bgpRcvdPathAttrTable (struct variable *v, oid name[], size_t *length,
- int exact, size_t *var_len, WriteMethod **write_method)
- {
- /* Received Path Attribute Table. This table contains, one entry
- per path to a network, path attributes received from all peers
- running BGP version 3 or less. This table is obsolete, having
- been replaced in functionality with the bgp4PathAttrTable. */
- return NULL;
- }
- struct bgp_info *
- bgp4PathAttrLookup (struct variable *v, oid name[], size_t *length,
- struct bgp *bgp, struct prefix_ipv4 *addr, int exact)
- {
- oid *offset;
- int offsetlen;
- struct bgp_info *binfo;
- struct bgp_info *min;
- struct bgp_node *rn;
- union sockunion su;
- int len;
- struct in_addr paddr;
- #define BGP_PATHATTR_ENTRY_OFFSET
- (IN_ADDR_SIZE + 1 + IN_ADDR_SIZE)
- if (exact)
- {
- if (*length - v->namelen != BGP_PATHATTR_ENTRY_OFFSET)
- return NULL;
- /* Set OID offset for prefix. */
- offset = name + v->namelen;
- oid2in_addr (offset, IN_ADDR_SIZE, &addr->prefix);
- offset += IN_ADDR_SIZE;
- /* Prefix length. */
- addr->prefixlen = *offset;
- offset++;
- /* Peer address. */
- su.sin.sin_family = AF_INET;
- oid2in_addr (offset, IN_ADDR_SIZE, &su.sin.sin_addr);
- /* Lookup node. */
- rn = bgp_node_lookup (bgp->rib[AFI_IP][SAFI_UNICAST],
- (struct prefix *) addr);
- if (rn)
- {
- bgp_unlock_node (rn);
- for (binfo = rn->info; binfo; binfo = binfo->next)
- if (sockunion_same (&binfo->peer->su, &su))
- return binfo;
- }
- }
- else
- {
- offset = name + v->namelen;
- offsetlen = *length - v->namelen;
- len = offsetlen;
- if (offsetlen == 0)
- rn = bgp_table_top (bgp->rib[AFI_IP][SAFI_UNICAST]);
- else
- {
- if (len > IN_ADDR_SIZE)
- len = IN_ADDR_SIZE;
-
- oid2in_addr (offset, len, &addr->prefix);
- offset += IN_ADDR_SIZE;
- offsetlen -= IN_ADDR_SIZE;
- if (offsetlen > 0)
- addr->prefixlen = *offset;
- else
- addr->prefixlen = len * 8;
- rn = bgp_node_get (bgp->rib[AFI_IP][SAFI_UNICAST],
- (struct prefix *) addr);
- offset++;
- offsetlen--;
- }
- if (offsetlen > 0)
- {
- len = offsetlen;
- if (len > IN_ADDR_SIZE)
- len = IN_ADDR_SIZE;
- oid2in_addr (offset, len, &paddr);
- }
- else
- paddr.s_addr = 0;
- if (! rn)
- return NULL;
- do
- {
- min = NULL;
- for (binfo = rn->info; binfo; binfo = binfo->next)
- {
- if (binfo->peer->su.sin.sin_family == AF_INET
- && ntohl (paddr.s_addr)
- < ntohl (binfo->peer->su.sin.sin_addr.s_addr))
- {
- if (min)
- {
- if (ntohl (binfo->peer->su.sin.sin_addr.s_addr)
- < ntohl (min->peer->su.sin.sin_addr.s_addr))
- min = binfo;
- }
- else
- min = binfo;
- }
- }
- if (min)
- {
- *length = v->namelen + BGP_PATHATTR_ENTRY_OFFSET;
- offset = name + v->namelen;
- oid_copy_addr (offset, &rn->p.u.prefix4, IN_ADDR_SIZE);
- offset += IN_ADDR_SIZE;
- *offset = rn->p.prefixlen;
- offset++;
- oid_copy_addr (offset, &min->peer->su.sin.sin_addr,
- IN_ADDR_SIZE);
- addr->prefix = rn->p.u.prefix4;
- addr->prefixlen = rn->p.prefixlen;
- bgp_unlock_node (rn);
- return min;
- }
- paddr.s_addr = 0;
- }
- while ((rn = bgp_route_next (rn)) != NULL);
- }
- return NULL;
- }
- u_char *
- bgp4PathAttrTable (struct variable *v, oid name[], size_t *length,
- int exact, size_t *var_len, WriteMethod **write_method)
- {
- struct bgp *bgp;
- struct bgp_info *binfo;
- struct prefix_ipv4 addr;
-
- bgp = bgp_get_default ();
- if (! bgp)
- return NULL;
- memset (&addr, 0, sizeof (struct prefix_ipv4));
- binfo = bgp4PathAttrLookup (v, name, length, bgp, &addr, exact);
- if (! binfo)
- return NULL;
- switch (v->magic)
- {
- case BGP4PATHATTRPEER: /* 1 */
- return SNMP_IPADDRESS (binfo->peer->su.sin.sin_addr);
- break;
- case BGP4PATHATTRIPADDRPREFIXLEN: /* 2 */
- return SNMP_INTEGER (addr.prefixlen);
- break;
- case BGP4PATHATTRIPADDRPREFIX: /* 3 */
- return SNMP_IPADDRESS (addr.prefix);
- break;
- case BGP4PATHATTRORIGIN: /* 4 */
- return SNMP_INTEGER (binfo->attr->origin);
- break;
- case BGP4PATHATTRASPATHSEGMENT: /* 5 */
- *var_len = binfo->attr->aspath->length;
- return (u_char *) binfo->attr->aspath->data;
- break;
- case BGP4PATHATTRNEXTHOP: /* 6 */
- return SNMP_IPADDRESS (binfo->attr->nexthop);
- break;
- case BGP4PATHATTRMULTIEXITDISC: /* 7 */
- return SNMP_INTEGER (binfo->attr->med);
- break;
- case BGP4PATHATTRLOCALPREF: /* 8 */
- return SNMP_INTEGER (binfo->attr->local_pref);
- break;
- case BGP4PATHATTRATOMICAGGREGATE: /* 9 */
- return SNMP_INTEGER (1);
- break;
- case BGP4PATHATTRAGGREGATORAS: /* 10 */
- return SNMP_INTEGER (binfo->attr->aggregator_as);
- break;
- case BGP4PATHATTRAGGREGATORADDR: /* 11 */
- return SNMP_IPADDRESS (binfo->attr->aggregator_addr);
- break;
- case BGP4PATHATTRCALCLOCALPREF: /* 12 */
- return SNMP_INTEGER (-1);
- break;
- case BGP4PATHATTRBEST: /* 13 */
- #define BGP4_PathAttrBest_false 1
- #define BGP4_PathAttrBest_true 2
- if (CHECK_FLAG (binfo->flags, BGP_INFO_SELECTED))
- return SNMP_INTEGER (BGP4_PathAttrBest_true);
- else
- return SNMP_INTEGER (BGP4_PathAttrBest_false);
- break;
- case BGP4PATHATTRUNKNOWN: /* 14 */
- *var_len = 0;
- return NULL;
- break;
- }
- return NULL;
- }
- /* BGP Traps. */
- struct trap_object bgpTrapList[] =
- {
- {bgpPeerTable, 3, {3, 1, BGPPEERLASTERROR}},
- {bgpPeerTable, 3, {3, 1, BGPPEERSTATE}}
- };
- void
- bgpTrapEstablished (struct peer *peer)
- {
- int ret;
- struct in_addr addr;
- oid index[sizeof (oid) * IN_ADDR_SIZE];
- ret = inet_aton (peer->host, &addr);
- if (ret == 0)
- return;
- oid_copy_addr (index, &addr, IN_ADDR_SIZE);
- smux_trap (bgp_oid, sizeof bgp_oid / sizeof (oid),
- index, IN_ADDR_SIZE,
- bgpTrapList, sizeof bgpTrapList / sizeof (struct trap_object),
- bm->start_time - time (NULL), BGPESTABLISHED);
- }
- void
- bgpTrapBackwardTransition (struct peer *peer)
- {
- int ret;
- struct in_addr addr;
- oid index[sizeof (oid) * IN_ADDR_SIZE];
- ret = inet_aton (peer->host, &addr);
- if (ret == 0)
- return;
- oid_copy_addr (index, &addr, IN_ADDR_SIZE);
- smux_trap (bgp_oid, sizeof bgp_oid / sizeof (oid),
- index, IN_ADDR_SIZE,
- bgpTrapList, sizeof bgpTrapList / sizeof (struct trap_object),
- bm->start_time - time (NULL), BGPBACKWARDTRANSITION);
- }
- void
- bgp_snmp_init ()
- {
- smux_init (bgpd_oid, sizeof bgpd_oid / sizeof (oid));
- REGISTER_MIB("mibII/bgp", bgp_variables, variable, bgp_oid);
- smux_start ();
- }
- #endif /* HAVE_SNMP */