Adding upstream version 8.4.4.upstream/8.4.4upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 916 insertions, 0 deletions

diff --git a/bgpd/bgp_snmp.c b/bgpd/bgp_snmp.c
new file mode 100644
index 0000000..6bc3134
--- /dev/null
+++ b/bgpd/bgp_snmp.c
@@ -0,0 +1,916 @@
+/* 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 "lib/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"
+#include "bgpd/bgp_mplsvpn_snmp.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;
+
+	/* Return BGP version.  Zebra bgpd only support version 4. */
+	version = (0x80 >> (BGP_VERSION_4 - 1));
+
+	/* Return octet string length 1. */
+	*var_len = 1;
+	return &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;
+	struct listnode *bgpnode;
+
+	for (ALL_LIST_ELEMENTS_RO(bm->bgp, bgpnode, bgp)) {
+		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;
+	struct listnode *bgpnode;
+
+	for (ALL_LIST_ELEMENTS_RO(bm->bgp, bgpnode, bgp)) {
+		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_in_addr(name + namelen, 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(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(addr));
+
+	peer = bgpPeerTable_lookup(v, name, length, &addr, exact);
+	if (!peer)
+		return NULL;
+
+	switch (v->magic) {
+	case BGPPEERIDENTIFIER:
+		return SNMP_IPADDRESS(peer->remote_id);
+	case BGPPEERSTATE:
+		return SNMP_INTEGER(peer->status);
+	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);
+	case BGPPEERNEGOTIATEDVERSION:
+		return SNMP_INTEGER(BGP_VERSION_4);
+	case BGPPEERLOCALADDR:
+		if (peer->su_local)
+			return SNMP_IPADDRESS(peer->su_local->sin.sin_addr);
+		else
+			return SNMP_IPADDRESS(bgp_empty_addr);
+	case BGPPEERLOCALPORT:
+		if (peer->su_local)
+			return SNMP_INTEGER(
+				ntohs(peer->su_local->sin.sin_port));
+		else
+			return SNMP_INTEGER(0);
+	case BGPPEERREMOTEADDR:
+		if (peer->su_remote)
+			return SNMP_IPADDRESS(peer->su_remote->sin.sin_addr);
+		else
+			return SNMP_IPADDRESS(bgp_empty_addr);
+	case BGPPEERREMOTEPORT:
+		if (peer->su_remote)
+			return SNMP_INTEGER(
+				ntohs(peer->su_remote->sin.sin_port));
+		else
+			return SNMP_INTEGER(0);
+	case BGPPEERREMOTEAS:
+		return SNMP_INTEGER(peer->as);
+	case BGPPEERINUPDATES:
+		ui = atomic_load_explicit(&peer->update_in,
+					  memory_order_relaxed);
+		return SNMP_INTEGER(ui);
+	case BGPPEEROUTUPDATES:
+		uo = atomic_load_explicit(&peer->update_out,
+					  memory_order_relaxed);
+		return SNMP_INTEGER(uo);
+	case BGPPEERINTOTALMESSAGES:
+		return SNMP_INTEGER(PEER_TOTAL_RX(peer));
+	case BGPPEEROUTTOTALMESSAGES:
+		return SNMP_INTEGER(PEER_TOTAL_TX(peer));
+	case BGPPEERLASTERROR: {
+		static uint8_t lasterror[2];
+		lasterror[0] = peer->notify.code;
+		lasterror[1] = peer->notify.subcode;
+		*var_len = 2;
+		return (uint8_t *)&lasterror;
+	}
+	case BGPPEERFSMESTABLISHEDTRANSITIONS:
+		return SNMP_INTEGER(peer->established);
+	case BGPPEERFSMESTABLISHEDTIME:
+		if (peer->uptime == 0)
+			return SNMP_INTEGER(0);
+		else
+			return SNMP_INTEGER(monotime(NULL) - peer->uptime);
+	case BGPPEERCONNECTRETRYINTERVAL:
+		*write_method = write_bgpPeerTable;
+		return SNMP_INTEGER(peer->v_connect);
+	case BGPPEERHOLDTIME:
+		return SNMP_INTEGER(peer->v_holdtime);
+	case BGPPEERKEEPALIVE:
+		return SNMP_INTEGER(peer->v_keepalive);
+	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);
+	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);
+	case BGPPEERMINROUTEADVERTISEMENTINTERVAL:
+		*write_method = write_bgpPeerTable;
+		return SNMP_INTEGER(peer->v_routeadv);
+	case BGPPEERINUPDATEELAPSEDTIME:
+		if (peer->update_time == 0)
+			return SNMP_INTEGER(0);
+		else
+			return SNMP_INTEGER(monotime(NULL) - peer->update_time);
+	default:
+		return NULL;
+	}
+	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_dest *dest;
+	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. */
+		dest = bgp_node_lookup(bgp->rib[AFI_IP][SAFI_UNICAST],
+				       (struct prefix *)addr);
+		if (dest) {
+			for (path = bgp_dest_get_bgp_path_info(dest); path;
+			     path = path->next)
+				if (sockunion_same(&path->peer->su, &su))
+					return path;
+
+			bgp_dest_unlock_node(dest);
+		}
+	} else {
+		offset = name + v->namelen;
+		offsetlen = *length - v->namelen;
+		len = offsetlen;
+
+		if (offsetlen == 0)
+			dest = 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;
+
+			dest = 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 = INADDR_ANY;
+
+		if (!dest)
+			return NULL;
+
+		do {
+			min = NULL;
+
+			for (path = bgp_dest_get_bgp_path_info(dest); 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) {
+				const struct prefix *rn_p =
+					bgp_dest_get_prefix(dest);
+
+				*length =
+					v->namelen + BGP_PATHATTR_ENTRY_OFFSET;
+
+				offset = name + v->namelen;
+				oid_copy_in_addr(offset, &rn_p->u.prefix4);
+				offset += IN_ADDR_SIZE;
+				*offset = rn_p->prefixlen;
+				offset++;
+				oid_copy_in_addr(offset,
+						 &min->peer->su.sin.sin_addr);
+				addr->prefix = rn_p->u.prefix4;
+				addr->prefixlen = rn_p->prefixlen;
+
+				bgp_dest_unlock_node(dest);
+
+				return min;
+			}
+
+			paddr.s_addr = INADDR_ANY;
+		} while ((dest = bgp_route_next(dest)) != 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(addr));
+
+	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);
+	case BGP4PATHATTRIPADDRPREFIXLEN: /* 2 */
+		return SNMP_INTEGER(addr.prefixlen);
+	case BGP4PATHATTRIPADDRPREFIX: /* 3 */
+		return SNMP_IPADDRESS(addr.prefix);
+	case BGP4PATHATTRORIGIN: /* 4 */
+		return SNMP_INTEGER(path->attr->origin);
+	case BGP4PATHATTRASPATHSEGMENT: /* 5 */
+		return aspath_snmp_pathseg(path->attr->aspath, var_len);
+	case BGP4PATHATTRNEXTHOP: /* 6 */
+		return SNMP_IPADDRESS(path->attr->nexthop);
+	case BGP4PATHATTRMULTIEXITDISC: /* 7 */
+		return SNMP_INTEGER(path->attr->med);
+	case BGP4PATHATTRLOCALPREF: /* 8 */
+		return SNMP_INTEGER(path->attr->local_pref);
+	case BGP4PATHATTRATOMICAGGREGATE: /* 9 */
+		return SNMP_INTEGER(1);
+	case BGP4PATHATTRAGGREGATORAS: /* 10 */
+		return SNMP_INTEGER(path->attr->aggregator_as);
+	case BGP4PATHATTRAGGREGATORADDR: /* 11 */
+		return SNMP_IPADDRESS(path->attr->aggregator_addr);
+	case BGP4PATHATTRCALCLOCALPREF: /* 12 */
+		return SNMP_INTEGER(-1);
+	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);
+	case BGP4PATHATTRUNKNOWN: /* 14 */
+		*var_len = 0;
+		return NULL;
+	}
+	return NULL;
+}
+
+/* BGP Traps. */
+static struct trap_object bgpTrapList[] = {{3, {3, 1, BGPPEERREMOTEADDR} },
+					   {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];
+
+	/* Check if this peer just went to Established */
+	if ((peer->ostatus != OpenConfirm) || !(peer_established(peer)))
+		return 0;
+
+	ret = inet_aton(peer->host, &addr);
+	if (ret == 0)
+		return 0;
+
+	oid_copy_in_addr(index, &addr);
+
+	smux_trap(bgp_variables, array_size(bgp_variables), bgp_trap_oid,
+		  array_size(bgp_trap_oid), bgp_oid,
+		  sizeof(bgp_oid) / sizeof(oid), index, IN_ADDR_SIZE,
+		  bgpTrapList, array_size(bgpTrapList), 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_in_addr(index, &addr);
+
+	smux_trap(bgp_variables, array_size(bgp_variables), bgp_trap_oid,
+		  array_size(bgp_trap_oid), bgp_oid,
+		  sizeof(bgp_oid) / sizeof(oid), index, IN_ADDR_SIZE,
+		  bgpTrapList, array_size(bgpTrapList), BGPBACKWARDTRANSITION);
+	return 0;
+}
+
+static int bgp_snmp_init(struct thread_master *tm)
+{
+	smux_init(tm);
+	REGISTER_MIB("mibII/bgp", bgp_variables, variable, bgp_oid);
+	bgp_mpls_l3vpn_module_init();
+	return 0;
+}
+
+static int bgp_snmp_module_init(void)
+{
+	hook_register(peer_status_changed, 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,
+);