/* 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 this program; see the file COPYING; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <zebra.h>
#include <net-snmp/net-snmp-config.h>
#include <net-snmp/net-snmp-includes.h>
#include "if.h"
#include "log.h"
#include "prefix.h"
#include "command.h"
#include "thread.h"
#include "smux.h"
#include "filter.h"
#include "hook.h"
#include "libfrr.h"
#include "version.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
/* 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 BGPPEERMINROUTEADVERTISEMENTINTERVAL 22
#define BGPPEERINUPDATEELAPSEDTIME 23
/* 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. */
static oid bgp_oid[] = {BGP4MIB};
static oid bgp_trap_oid[] = {BGP4MIB, 0};
/* IP address 0.0.0.0. */
static struct in_addr bgp_empty_addr = {.s_addr = 0};
/* Hook functions. */
static uint8_t *bgpVersion(struct variable *, oid[], size_t *, int, size_t *,
WriteMethod **);
static uint8_t *bgpLocalAs(struct variable *, oid[], size_t *, int, size_t *,
WriteMethod **);
static uint8_t *bgpPeerTable(struct variable *, oid[], size_t *, int, size_t *,
WriteMethod **);
static uint8_t *bgpRcvdPathAttrTable(struct variable *, oid[], size_t *, int,
size_t *, WriteMethod **);
static uint8_t *bgpIdentifier(struct variable *, oid[], size_t *, int, size_t *,
WriteMethod **);
static uint8_t *bgp4PathAttrTable(struct variable *, oid[], size_t *, int,
size_t *, WriteMethod **);
/* static uint8_t *bgpTraps (); */
static 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}},
{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 uint8_t *bgpVersion(struct variable *v, oid name[], size_t *length,
int exact, size_t *var_len,
WriteMethod **write_method)
{
static uint8_t 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 (uint8_t *)&version;
}
static uint8_t *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);
}
static struct peer *peer_lookup_addr_ipv4(struct in_addr *src)
{
struct bgp *bgp;
struct peer *peer;
struct listnode *node;
bgp = bgp_get_default();
if (!bgp)
return NULL;
for (ALL_LIST_ELEMENTS_RO(bgp->peer, node, peer)) {
if (sockunion_family(&peer->su) != AF_INET)
continue;
if (sockunion2ip(&peer->su) == src->s_addr)
return peer;
}
return NULL;
}
static struct peer *bgp_peer_lookup_next(struct in_addr *src)
{
struct bgp *bgp;
struct peer *peer;
struct peer *next_peer = NULL;
struct listnode *node;
bgp = bgp_get_default();
if (!bgp)
return NULL;
for (ALL_LIST_ELEMENTS_RO(bgp->peer, node, peer)) {
if (sockunion_family(&peer->su) != AF_INET)
continue;
if (ntohl(sockunion2ip(&peer->su)) <= ntohl(src->s_addr))
continue;
if (!next_peer
|| ntohl(sockunion2ip(&next_peer->su))
> ntohl(sockunion2ip(&peer->su))) {
next_peer = peer;
}
}
if (next_peer) {
src->s_addr = sockunion2ip(&next_peer->su);
return next_peer;
}
return NULL;
}
/* 1.3.6.1.2.1.15.3.1.x = 10 */
#define PEERTAB_NAMELEN 10
static struct peer *bgpPeerTable_lookup(struct variable *v, oid name[],
size_t *length, struct in_addr *addr,
int exact)
{
struct peer *peer = NULL;
size_t namelen = v ? v->namelen : PEERTAB_NAMELEN;
int len;
if (exact) {
/* Check the length. */
if (*length - namelen != sizeof(struct in_addr))
return NULL;
oid2in_addr(name + namelen, IN_ADDR_SIZE, addr);
peer = peer_lookup_addr_ipv4(addr);
return peer;
} else {
len = *length - namelen;
if (len > 4)
len = 4;
oid2in_addr(name + namelen, len, addr);
peer = bgp_peer_lookup_next(addr);
if (peer == NULL)
return NULL;
oid_copy_addr(name + namelen, addr, sizeof(struct in_addr));
*length = sizeof(struct in_addr) + namelen;
return peer;
}
return NULL;
}
/* BGP write methods. */
static int write_bgpPeerTable(int action, uint8_t *var_val,
uint8_t var_val_type, size_t var_val_len,
uint8_t *statP, oid *name, size_t length)
{
struct in_addr addr;
struct peer *peer;
long intval;
if (var_val_type != ASN_INTEGER) {
return SNMP_ERR_WRONGTYPE;
}
if (var_val_len != sizeof(long)) {
return SNMP_ERR_WRONGLENGTH;
}
intval = *(long *)var_val;
memset(&addr, 0, sizeof(struct in_addr));
peer = bgpPeerTable_lookup(NULL, name, &length, &addr, 1);
if (!peer)
return SNMP_ERR_NOSUCHNAME;
if (action != SNMP_MSG_INTERNAL_SET_COMMIT)
return SNMP_ERR_NOERROR;
zlog_info("%s: SNMP write .%ld = %ld", peer->host,
(long)name[PEERTAB_NAMELEN - 1], intval);
switch (name[PEERTAB_NAMELEN - 1]) {
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 BGPPEERCONNECTRETRYINTERVAL:
peer_flag_set(peer, PEER_FLAG_TIMER_CONNECT);
peer->connect = intval;
peer->v_connect = intval;
break;
case BGPPEERHOLDTIMECONFIGURED:
peer_flag_set(peer, PEER_FLAG_TIMER);
peer->holdtime = intval;
peer->v_holdtime = intval;
break;
case BGPPEERKEEPALIVECONFIGURED:
peer_flag_set(peer, PEER_FLAG_TIMER);
peer->keepalive = intval;
peer->v_keepalive = intval;
break;
case BGPPEERMINROUTEADVERTISEMENTINTERVAL:
peer->v_routeadv = intval;
break;
}
return SNMP_ERR_NOERROR;
}
static uint8_t *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;
uint32_t ui, uo;
if (smux_header_table(v, name, length, exact, var_len, write_method)
== MATCH_FAILED)
return 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:
ui = atomic_load_explicit(&peer->update_in,
memory_order_relaxed);
return SNMP_INTEGER(ui);
break;
case BGPPEEROUTUPDATES:
uo = atomic_load_explicit(&peer->update_out,
memory_order_relaxed);
return SNMP_INTEGER(uo);
break;
case BGPPEERINTOTALMESSAGES:
return SNMP_INTEGER(PEER_TOTAL_RX(peer));
break;
case BGPPEEROUTTOTALMESSAGES:
return SNMP_INTEGER(PEER_TOTAL_TX(peer));
break;
case BGPPEERLASTERROR: {
static uint8_t lasterror[2];
lasterror[0] = peer->notify.code;
lasterror[1] = peer->notify.subcode;
*var_len = 2;
return (uint8_t *)&lasterror;
} break;
case BGPPEERFSMESTABLISHEDTRANSITIONS:
return SNMP_INTEGER(peer->established);
break;
case BGPPEERFSMESTABLISHEDTIME:
if (peer->uptime == 0)
return SNMP_INTEGER(0);
else
return SNMP_INTEGER(bgp_clock() - 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->flags, PEER_FLAG_TIMER))
return SNMP_INTEGER(peer->holdtime);
else
return SNMP_INTEGER(peer->v_holdtime);
break;
case BGPPEERKEEPALIVECONFIGURED:
*write_method = write_bgpPeerTable;
if (CHECK_FLAG(peer->flags, PEER_FLAG_TIMER))
return SNMP_INTEGER(peer->keepalive);
else
return SNMP_INTEGER(peer->v_keepalive);
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(bgp_clock() - peer->update_time);
break;
default:
return NULL;
break;
}
return NULL;
}
static uint8_t *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);
}
static uint8_t *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;
}
static struct bgp_path_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_path_info *path;
struct bgp_path_info *min;
struct bgp_node *rn;
union sockunion su;
unsigned int len;
struct in_addr paddr;
sockunion_init(&su);
#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 (path = bgp_node_get_bgp_path_info(rn); path;
path = path->next)
if (sockunion_same(&path->peer->su, &su))
return path;
}
} 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 (path = bgp_node_get_bgp_path_info(rn); path;
path = path->next) {
if (path->peer->su.sin.sin_family == AF_INET
&& ntohl(paddr.s_addr)
< ntohl(path->peer->su.sin
.sin_addr
.s_addr)) {
if (min) {
if (ntohl(path->peer->su.sin
.sin_addr
.s_addr)
< ntohl(min->peer->su.sin
.sin_addr
.s_addr))
min = path;
} else
min = path;
}
}
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;
}
static uint8_t *bgp4PathAttrTable(struct variable *v, oid name[],
size_t *length, int exact, size_t *var_len,
WriteMethod **write_method)
{
struct bgp *bgp;
struct bgp_path_info *path;
struct prefix_ipv4 addr;
bgp = bgp_get_default();
if (!bgp)
return NULL;
if (smux_header_table(v, name, length, exact, var_len, write_method)
== MATCH_FAILED)
return NULL;
memset(&addr, 0, sizeof(struct prefix_ipv4));
path = bgp4PathAttrLookup(v, name, length, bgp, &addr, exact);
if (!path)
return NULL;
switch (v->magic) {
case BGP4PATHATTRPEER: /* 1 */
return SNMP_IPADDRESS(path->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(path->attr->origin);
break;
case BGP4PATHATTRASPATHSEGMENT: /* 5 */
return aspath_snmp_pathseg(path->attr->aspath, var_len);
break;
case BGP4PATHATTRNEXTHOP: /* 6 */
return SNMP_IPADDRESS(path->attr->nexthop);
break;
case BGP4PATHATTRMULTIEXITDISC: /* 7 */
return SNMP_INTEGER(path->attr->med);
break;
case BGP4PATHATTRLOCALPREF: /* 8 */
return SNMP_INTEGER(path->attr->local_pref);
break;
case BGP4PATHATTRATOMICAGGREGATE: /* 9 */
return SNMP_INTEGER(1);
break;
case BGP4PATHATTRAGGREGATORAS: /* 10 */
return SNMP_INTEGER(path->attr->aggregator_as);
break;
case BGP4PATHATTRAGGREGATORADDR: /* 11 */
return SNMP_IPADDRESS(path->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(path->flags, BGP_PATH_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. */
static struct trap_object bgpTrapList[] = {{3, {3, 1, BGPPEERLASTERROR}},
{3, {3, 1, BGPPEERSTATE}}};
static int 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 0;
oid_copy_addr(index, &addr, IN_ADDR_SIZE);
smux_trap(bgp_variables, sizeof bgp_variables / sizeof(struct variable),
bgp_trap_oid, sizeof bgp_trap_oid / sizeof(oid), bgp_oid,
sizeof bgp_oid / sizeof(oid), index, IN_ADDR_SIZE,
bgpTrapList, sizeof bgpTrapList / sizeof(struct trap_object),
BGPESTABLISHED);
return 0;
}
static int 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 0;
oid_copy_addr(index, &addr, IN_ADDR_SIZE);
smux_trap(bgp_variables, sizeof bgp_variables / sizeof(struct variable),
bgp_trap_oid, sizeof bgp_trap_oid / sizeof(oid), bgp_oid,
sizeof bgp_oid / sizeof(oid), index, IN_ADDR_SIZE,
bgpTrapList, sizeof bgpTrapList / sizeof(struct trap_object),
BGPBACKWARDTRANSITION);
return 0;
}
static int bgp_snmp_init(struct thread_master *tm)
{
smux_init(tm);
REGISTER_MIB("mibII/bgp", bgp_variables, variable, bgp_oid);
return 0;
}
static int bgp_snmp_module_init(void)
{
hook_register(peer_established, bgpTrapEstablished);
hook_register(peer_backward_transition, bgpTrapBackwardTransition);
hook_register(frr_late_init, bgp_snmp_init);
return 0;
}
FRR_MODULE_SETUP(.name = "bgpd_snmp", .version = FRR_VERSION,
.description = "bgpd AgentX SNMP module",
.init = bgp_snmp_module_init)