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bgp_bmp.c
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/* BMP support.
* Copyright (C) 2018 Yasuhiro Ohara
* Copyright (C) 2019 David Lamparter for NetDEF, Inc.
*
* This program 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 of the License, or (at your option)
* any later version.
*
* This program 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 "log.h"
#include "stream.h"
#include "sockunion.h"
#include "command.h"
#include "prefix.h"
#include "thread.h"
#include "linklist.h"
#include "queue.h"
#include "pullwr.h"
#include "memory.h"
#include "network.h"
#include "filter.h"
#include "lib_errors.h"
#include "stream.h"
#include "libfrr.h"
#include "version.h"
#include "jhash.h"
#include "termtable.h"
#include "bgpd/bgp_table.h"
#include "bgpd/bgpd.h"
#include "bgpd/bgp_route.h"
#include "bgpd/bgp_attr.h"
#include "bgpd/bgp_dump.h"
#include "bgpd/bgp_errors.h"
#include "bgpd/bgp_packet.h"
#include "bgpd/bgp_bmp.h"
#include "bgpd/bgp_fsm.h"
#include "bgpd/bgp_updgrp.h"
#include "bgpd/bgp_vty.h"
static void bmp_close(struct bmp *bmp);
static struct bmp_bgp *bmp_bgp_find(struct bgp *bgp);
static void bmp_targets_put(struct bmp_targets *bt);
static struct bmp_bgp_peer *bmp_bgp_peer_find(uint64_t peerid);
static struct bmp_bgp_peer *bmp_bgp_peer_get(struct peer *peer);
static void bmp_active_disconnected(struct bmp_active *ba);
static void bmp_active_put(struct bmp_active *ba);
DEFINE_MGROUP(BMP, "BMP (BGP Monitoring Protocol)")
DEFINE_MTYPE_STATIC(BMP, BMP_CONN, "BMP connection state")
DEFINE_MTYPE_STATIC(BMP, BMP_TARGETS, "BMP targets")
DEFINE_MTYPE_STATIC(BMP, BMP_TARGETSNAME, "BMP targets name")
DEFINE_MTYPE_STATIC(BMP, BMP_LISTENER, "BMP listener")
DEFINE_MTYPE_STATIC(BMP, BMP_ACTIVE, "BMP active connection config")
DEFINE_MTYPE_STATIC(BMP, BMP_ACLNAME, "BMP access-list name")
DEFINE_MTYPE_STATIC(BMP, BMP_QUEUE, "BMP update queue item")
DEFINE_MTYPE_STATIC(BMP, BMP, "BMP instance state")
DEFINE_MTYPE_STATIC(BMP, BMP_MIRRORQ, "BMP route mirroring buffer")
DEFINE_MTYPE_STATIC(BMP, BMP_PEER, "BMP per BGP peer data")
DEFINE_MTYPE_STATIC(BMP, BMP_OPEN, "BMP stored BGP OPEN message")
DEFINE_QOBJ_TYPE(bmp_targets)
static int bmp_bgp_cmp(const struct bmp_bgp *a, const struct bmp_bgp *b)
{
if (a->bgp < b->bgp)
return -1;
if (a->bgp > b->bgp)
return 1;
return 0;
}
static uint32_t bmp_bgp_hash(const struct bmp_bgp *e)
{
return jhash(&e->bgp, sizeof(e->bgp), 0x55aa5a5a);
}
DECLARE_HASH(bmp_bgph, struct bmp_bgp, bbi, bmp_bgp_cmp, bmp_bgp_hash)
struct bmp_bgph_head bmp_bgph;
static int bmp_bgp_peer_cmp(const struct bmp_bgp_peer *a,
const struct bmp_bgp_peer *b)
{
if (a->peerid < b->peerid)
return -1;
if (a->peerid > b->peerid)
return 1;
return 0;
}
static uint32_t bmp_bgp_peer_hash(const struct bmp_bgp_peer *e)
{
return e->peerid;
}
DECLARE_HASH(bmp_peerh, struct bmp_bgp_peer, bpi,
bmp_bgp_peer_cmp, bmp_bgp_peer_hash)
struct bmp_peerh_head bmp_peerh;
DECLARE_LIST(bmp_mirrorq, struct bmp_mirrorq, bmi)
/* listener management */
static int bmp_listener_cmp(const struct bmp_listener *a,
const struct bmp_listener *b)
{
int c;
c = sockunion_cmp(&a->addr, &b->addr);
if (c)
return c;
if (a->port < b->port)
return -1;
if (a->port > b->port)
return 1;
return 0;
}
DECLARE_SORTLIST_UNIQ(bmp_listeners, struct bmp_listener, bli, bmp_listener_cmp)
static int bmp_targets_cmp(const struct bmp_targets *a,
const struct bmp_targets *b)
{
return strcmp(a->name, b->name);
}
DECLARE_SORTLIST_UNIQ(bmp_targets, struct bmp_targets, bti, bmp_targets_cmp)
DECLARE_LIST(bmp_session, struct bmp, bsi)
DECLARE_DLIST(bmp_qlist, struct bmp_queue_entry, bli)
static int bmp_qhash_cmp(const struct bmp_queue_entry *a,
const struct bmp_queue_entry *b)
{
int ret;
ret = prefix_cmp(&a->p, &b->p);
if (ret)
return ret;
ret = memcmp(&a->peerid, &b->peerid,
offsetof(struct bmp_queue_entry, refcount) -
offsetof(struct bmp_queue_entry, peerid));
return ret;
}
static uint32_t bmp_qhash_hkey(const struct bmp_queue_entry *e)
{
uint32_t key;
key = prefix_hash_key((void *)&e->p);
key = jhash(&e->peerid,
offsetof(struct bmp_queue_entry, refcount) -
offsetof(struct bmp_queue_entry, peerid),
key);
return key;
}
DECLARE_HASH(bmp_qhash, struct bmp_queue_entry, bhi,
bmp_qhash_cmp, bmp_qhash_hkey)
static int bmp_active_cmp(const struct bmp_active *a,
const struct bmp_active *b)
{
int c;
c = strcmp(a->hostname, b->hostname);
if (c)
return c;
if (a->port < b->port)
return -1;
if (a->port > b->port)
return 1;
return 0;
}
DECLARE_SORTLIST_UNIQ(bmp_actives, struct bmp_active, bai, bmp_active_cmp)
static struct bmp *bmp_new(struct bmp_targets *bt, int bmp_sock)
{
struct bmp *new = XCALLOC(MTYPE_BMP_CONN, sizeof(struct bmp));
afi_t afi;
safi_t safi;
monotime(&new->t_up);
new->targets = bt;
new->socket = bmp_sock;
new->syncafi = AFI_MAX;
FOREACH_AFI_SAFI (afi, safi) {
new->afistate[afi][safi] = bt->afimon[afi][safi]
? BMP_AFI_NEEDSYNC : BMP_AFI_INACTIVE;
}
bmp_session_add_tail(&bt->sessions, new);
return new;
}
static void bmp_free(struct bmp *bmp)
{
bmp_session_del(&bmp->targets->sessions, bmp);
XFREE(MTYPE_BMP_CONN, bmp);
}
static void bmp_common_hdr(struct stream *s, uint8_t ver, uint8_t type)
{
stream_putc(s, ver);
stream_putl(s, 0); //dummy message length. will be set later.
stream_putc(s, type);
}
static void bmp_per_peer_hdr(struct stream *s, struct peer *peer,
uint8_t flags, const struct timeval *tv)
{
char peer_distinguisher[8];
#define BMP_PEER_TYPE_GLOBAL_INSTANCE 0
#define BMP_PEER_TYPE_RD_INSTANCE 1
#define BMP_PEER_TYPE_LOCAL_INSTANCE 2
#define BMP_PEER_FLAG_V (1 << 7)
#define BMP_PEER_FLAG_L (1 << 6)
#define BMP_PEER_FLAG_A (1 << 5)
/* Peer Type */
stream_putc(s, BMP_PEER_TYPE_GLOBAL_INSTANCE);
/* Peer Flags */
if (peer->su.sa.sa_family == AF_INET6)
SET_FLAG(flags, BMP_PEER_FLAG_V);
else
UNSET_FLAG(flags, BMP_PEER_FLAG_V);
stream_putc(s, flags);
/* Peer Distinguisher */
memset (&peer_distinguisher[0], 0, 8);
stream_put(s, &peer_distinguisher[0], 8);
/* Peer Address */
if (peer->su.sa.sa_family == AF_INET6)
stream_put(s, &peer->su.sin6.sin6_addr, 16);
else if (peer->su.sa.sa_family == AF_INET) {
stream_putl(s, 0);
stream_putl(s, 0);
stream_putl(s, 0);
stream_put_in_addr(s, &peer->su.sin.sin_addr);
} else {
stream_putl(s, 0);
stream_putl(s, 0);
stream_putl(s, 0);
stream_putl(s, 0);
}
/* Peer AS */
stream_putl(s, peer->as);
/* Peer BGP ID */
stream_put_in_addr(s, &peer->remote_id);
/* Timestamp */
if (tv) {
stream_putl(s, tv->tv_sec);
stream_putl(s, tv->tv_usec);
} else {
stream_putl(s, 0);
stream_putl(s, 0);
}
}
static void bmp_put_info_tlv(struct stream *s, uint16_t type,
const char *string)
{
int len = strlen (string);
stream_putw(s, type);
stream_putw(s, len);
stream_put(s, string, len);
}
static int bmp_send_initiation(struct bmp *bmp)
{
int len;
struct stream *s;
s = stream_new(BGP_MAX_PACKET_SIZE);
bmp_common_hdr(s, BMP_VERSION_3, BMP_TYPE_INITIATION);
#define BMP_INFO_TYPE_SYSDESCR 1
#define BMP_INFO_TYPE_SYSNAME 2
bmp_put_info_tlv(s, BMP_INFO_TYPE_SYSDESCR,
FRR_FULL_NAME " " FRR_VER_SHORT);
bmp_put_info_tlv(s, BMP_INFO_TYPE_SYSNAME, cmd_hostname_get());
len = stream_get_endp(s);
stream_putl_at(s, BMP_LENGTH_POS, len); //message length is set.
pullwr_write_stream(bmp->pullwr, s);
stream_free(s);
return 0;
}
static void bmp_notify_put(struct stream *s, struct bgp_notify *nfy)
{
size_t len_pos;
uint8_t marker[16] = {
0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff,
};
stream_put(s, marker, sizeof(marker));
len_pos = stream_get_endp(s);
stream_putw(s, 0);
stream_putc(s, BGP_MSG_NOTIFY);
stream_putc(s, nfy->code);
stream_putc(s, nfy->subcode);
stream_put(s, nfy->data, nfy->length);
stream_putw_at(s, len_pos, stream_get_endp(s) - len_pos
+ sizeof(marker));
}
static struct stream *bmp_peerstate(struct peer *peer, bool down)
{
struct stream *s;
size_t len;
struct timeval uptime, uptime_real;
uptime.tv_sec = peer->uptime;
uptime.tv_usec = 0;
monotime_to_realtime(&uptime, &uptime_real);
#define BGP_BMP_MAX_PACKET_SIZE 1024
s = stream_new(BGP_MAX_PACKET_SIZE);
if (peer->status == Established && !down) {
struct bmp_bgp_peer *bbpeer;
bmp_common_hdr(s, BMP_VERSION_3,
BMP_TYPE_PEER_UP_NOTIFICATION);
bmp_per_peer_hdr(s, peer, 0, &uptime_real);
/* Local Address (16 bytes) */
if (peer->su_local->sa.sa_family == AF_INET6)
stream_put(s, &peer->su_local->sin6.sin6_addr, 16);
else if (peer->su_local->sa.sa_family == AF_INET) {
stream_putl(s, 0);
stream_putl(s, 0);
stream_putl(s, 0);
stream_put_in_addr(s, &peer->su_local->sin.sin_addr);
}
/* Local Port, Remote Port */
if (peer->su_local->sa.sa_family == AF_INET6)
stream_putw(s, peer->su_local->sin6.sin6_port);
else if (peer->su_local->sa.sa_family == AF_INET)
stream_putw(s, peer->su_local->sin.sin_port);
if (peer->su_remote->sa.sa_family == AF_INET6)
stream_putw(s, peer->su_remote->sin6.sin6_port);
else if (peer->su_remote->sa.sa_family == AF_INET)
stream_putw(s, peer->su_remote->sin.sin_port);
static const uint8_t dummy_open[] = {
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0x00, 0x13, 0x01,
};
bbpeer = bmp_bgp_peer_find(peer->qobj_node.nid);
if (bbpeer && bbpeer->open_tx)
stream_put(s, bbpeer->open_tx, bbpeer->open_tx_len);
else {
stream_put(s, dummy_open, sizeof(dummy_open));
zlog_warn("bmp: missing TX OPEN message for peer %s",
peer->host);
}
if (bbpeer && bbpeer->open_rx)
stream_put(s, bbpeer->open_rx, bbpeer->open_rx_len);
else {
stream_put(s, dummy_open, sizeof(dummy_open));
zlog_warn("bmp: missing RX OPEN message for peer %s",
peer->host);
}
if (peer->desc)
bmp_put_info_tlv(s, 0, peer->desc);
} else {
uint8_t type;
size_t type_pos;
bmp_common_hdr(s, BMP_VERSION_3,
BMP_TYPE_PEER_DOWN_NOTIFICATION);
bmp_per_peer_hdr(s, peer, 0, &uptime_real);
type_pos = stream_get_endp(s);
stream_putc(s, 0); /* placeholder for down reason */
switch (peer->last_reset) {
case PEER_DOWN_NOTIFY_RECEIVED:
type = BMP_PEERDOWN_REMOTE_NOTIFY;
bmp_notify_put(s, &peer->notify);
break;
case PEER_DOWN_CLOSE_SESSION:
type = BMP_PEERDOWN_REMOTE_CLOSE;
break;
default:
type = BMP_PEERDOWN_LOCAL_NOTIFY;
stream_put(s, peer->last_reset_cause,
peer->last_reset_cause_size);
break;
}
stream_putc_at(s, type_pos, type);
}
len = stream_get_endp(s);
stream_putl_at(s, BMP_LENGTH_POS, len); //message length is set.
return s;
}
static int bmp_send_peerup(struct bmp *bmp)
{
struct peer *peer;
struct listnode *node;
struct stream *s;
/* Walk down all peers */
for (ALL_LIST_ELEMENTS_RO(bmp->targets->bgp->peer, node, peer)) {
s = bmp_peerstate(peer, false);
pullwr_write_stream(bmp->pullwr, s);
stream_free(s);
}
return 0;
}
/* XXX: kludge - filling the pullwr's buffer */
static void bmp_send_all(struct bmp_bgp *bmpbgp, struct stream *s)
{
struct bmp_targets *bt;
struct bmp *bmp;
frr_each(bmp_targets, &bmpbgp->targets, bt)
frr_each(bmp_session, &bt->sessions, bmp)
pullwr_write_stream(bmp->pullwr, s);
stream_free(s);
}
/*
* Route Mirroring
*/
#define BMP_MIRROR_TLV_TYPE_BGP_MESSAGE 0
#define BMP_MIRROR_TLV_TYPE_INFO 1
#define BMP_MIRROR_INFO_CODE_ERRORPDU 0
#define BMP_MIRROR_INFO_CODE_LOSTMSGS 1
static struct bmp_mirrorq *bmp_pull_mirror(struct bmp *bmp)
{
struct bmp_mirrorq *bmq;
bmq = bmp->mirrorpos;
if (!bmq)
return NULL;
bmp->mirrorpos = bmp_mirrorq_next(&bmp->targets->bmpbgp->mirrorq, bmq);
bmq->refcount--;
if (!bmq->refcount) {
bmp->targets->bmpbgp->mirror_qsize -= sizeof(*bmq) + bmq->len;
bmp_mirrorq_del(&bmp->targets->bmpbgp->mirrorq, bmq);
}
return bmq;
}
static void bmp_mirror_cull(struct bmp_bgp *bmpbgp)
{
while (bmpbgp->mirror_qsize > bmpbgp->mirror_qsizelimit) {
struct bmp_mirrorq *bmq, *inner;
struct bmp_targets *bt;
struct bmp *bmp;
bmq = bmp_mirrorq_first(&bmpbgp->mirrorq);
frr_each(bmp_targets, &bmpbgp->targets, bt) {
if (!bt->mirror)
continue;
frr_each(bmp_session, &bt->sessions, bmp) {
if (bmp->mirrorpos != bmq)
continue;
while ((inner = bmp_pull_mirror(bmp))) {
if (!inner->refcount)
XFREE(MTYPE_BMP_MIRRORQ,
inner);
}
zlog_warn("bmp[%s] lost mirror messages due to buffer size limit",
bmp->remote);
bmp->mirror_lost = true;
pullwr_bump(bmp->pullwr);
}
}
}
}
static int bmp_mirror_packet(struct peer *peer, uint8_t type, bgp_size_t size,
struct stream *packet)
{
struct bmp_bgp *bmpbgp = bmp_bgp_find(peer->bgp);
struct timeval tv;
struct bmp_mirrorq *qitem;
struct bmp_targets *bt;
struct bmp *bmp;
gettimeofday(&tv, NULL);
if (type == BGP_MSG_OPEN) {
struct bmp_bgp_peer *bbpeer = bmp_bgp_peer_get(peer);
XFREE(MTYPE_BMP_OPEN, bbpeer->open_rx);
bbpeer->open_rx_len = size;
bbpeer->open_rx = XMALLOC(MTYPE_BMP_OPEN, size);
memcpy(bbpeer->open_rx, packet->data, size);
}
if (!bmpbgp)
return 0;
qitem = XCALLOC(MTYPE_BMP_MIRRORQ, sizeof(*qitem) + size);
qitem->peerid = peer->qobj_node.nid;
qitem->tv = tv;
qitem->len = size;
memcpy(qitem->data, packet->data, size);
frr_each(bmp_targets, &bmpbgp->targets, bt) {
if (!bt->mirror)
continue;
frr_each(bmp_session, &bt->sessions, bmp) {
qitem->refcount++;
if (!bmp->mirrorpos)
bmp->mirrorpos = qitem;
pullwr_bump(bmp->pullwr);
}
}
if (qitem->refcount == 0)
XFREE(MTYPE_BMP_MIRRORQ, qitem);
else {
bmpbgp->mirror_qsize += sizeof(*qitem) + size;
bmp_mirrorq_add_tail(&bmpbgp->mirrorq, qitem);
bmp_mirror_cull(bmpbgp);
bmpbgp->mirror_qsizemax = MAX(bmpbgp->mirror_qsizemax,
bmpbgp->mirror_qsize);
}
return 0;
}
static void bmp_wrmirror_lost(struct bmp *bmp, struct pullwr *pullwr)
{
struct stream *s;
struct timeval tv;
gettimeofday(&tv, NULL);
s = stream_new(BGP_MAX_PACKET_SIZE);
bmp_common_hdr(s, BMP_VERSION_3, BMP_TYPE_ROUTE_MIRRORING);
bmp_per_peer_hdr(s, bmp->targets->bgp->peer_self, 0, &tv);
stream_putw(s, BMP_MIRROR_TLV_TYPE_INFO);
stream_putw(s, 2);
stream_putw(s, BMP_MIRROR_INFO_CODE_LOSTMSGS);
stream_putl_at(s, BMP_LENGTH_POS, stream_get_endp(s));
bmp->cnt_mirror_overruns++;
pullwr_write_stream(bmp->pullwr, s);
stream_free(s);
}
static bool bmp_wrmirror(struct bmp *bmp, struct pullwr *pullwr)
{
struct bmp_mirrorq *bmq;
struct peer *peer;
bool written = false;
if (bmp->mirror_lost) {
bmp_wrmirror_lost(bmp, pullwr);
bmp->mirror_lost = false;
return true;
}
bmq = bmp_pull_mirror(bmp);
if (!bmq)
return false;
peer = QOBJ_GET_TYPESAFE(bmq->peerid, peer);
if (!peer) {
zlog_info("bmp: skipping mirror message for deleted peer");
goto out;
}
struct stream *s;
s = stream_new(BGP_MAX_PACKET_SIZE);
bmp_common_hdr(s, BMP_VERSION_3, BMP_TYPE_ROUTE_MIRRORING);
bmp_per_peer_hdr(s, peer, 0, &bmq->tv);
/* BMP Mirror TLV. */
stream_putw(s, BMP_MIRROR_TLV_TYPE_BGP_MESSAGE);
stream_putw(s, bmq->len);
stream_putl_at(s, BMP_LENGTH_POS, stream_get_endp(s) + bmq->len);
bmp->cnt_mirror++;
pullwr_write_stream(bmp->pullwr, s);
pullwr_write(bmp->pullwr, bmq->data, bmq->len);
stream_free(s);
written = true;
out:
if (!bmq->refcount)
XFREE(MTYPE_BMP_MIRRORQ, bmq);
return written;
}
static int bmp_outgoing_packet(struct peer *peer, uint8_t type, bgp_size_t size,
struct stream *packet)
{
if (type == BGP_MSG_OPEN) {
struct bmp_bgp_peer *bbpeer = bmp_bgp_peer_get(peer);
XFREE(MTYPE_BMP_OPEN, bbpeer->open_tx);
bbpeer->open_tx_len = size;
bbpeer->open_tx = XMALLOC(MTYPE_BMP_OPEN, size);
memcpy(bbpeer->open_tx, packet->data, size);
}
return 0;
}
static int bmp_peer_established(struct peer *peer)
{
struct bmp_bgp *bmpbgp = bmp_bgp_find(peer->bgp);
if (!bmpbgp)
return 0;
/* Check if this peer just went to Established */
if ((peer->ostatus != OpenConfirm) || !(peer_established(peer)))
return 0;
if (peer->doppelganger && (peer->doppelganger->status != Deleted)) {
struct bmp_bgp_peer *bbpeer, *bbdopp;
bbpeer = bmp_bgp_peer_get(peer);
bbdopp = bmp_bgp_peer_find(peer->doppelganger->qobj_node.nid);
if (bbdopp) {
XFREE(MTYPE_BMP_OPEN, bbpeer->open_tx);
XFREE(MTYPE_BMP_OPEN, bbpeer->open_rx);
bbpeer->open_tx = bbdopp->open_tx;
bbpeer->open_tx_len = bbdopp->open_tx_len;
bbpeer->open_rx = bbdopp->open_rx;
bbpeer->open_rx_len = bbdopp->open_rx_len;
bmp_peerh_del(&bmp_peerh, bbdopp);
XFREE(MTYPE_BMP_PEER, bbdopp);
}
}
bmp_send_all(bmpbgp, bmp_peerstate(peer, false));
return 0;
}
static int bmp_peer_backward(struct peer *peer)
{
struct bmp_bgp *bmpbgp = bmp_bgp_find(peer->bgp);
struct bmp_bgp_peer *bbpeer;
if (!bmpbgp)
return 0;
bbpeer = bmp_bgp_peer_find(peer->qobj_node.nid);
if (bbpeer) {
XFREE(MTYPE_BMP_OPEN, bbpeer->open_tx);
bbpeer->open_tx_len = 0;
XFREE(MTYPE_BMP_OPEN, bbpeer->open_rx);
bbpeer->open_rx_len = 0;
}
bmp_send_all(bmpbgp, bmp_peerstate(peer, true));
return 0;
}
static void bmp_eor(struct bmp *bmp, afi_t afi, safi_t safi, uint8_t flags)
{
struct peer *peer;
struct listnode *node;
struct stream *s, *s2;
iana_afi_t pkt_afi;
iana_safi_t pkt_safi;
s = stream_new(BGP_MAX_PACKET_SIZE);
/* Make BGP update packet. */
bgp_packet_set_marker(s, BGP_MSG_UPDATE);
/* Unfeasible Routes Length */
stream_putw(s, 0);
if (afi == AFI_IP && safi == SAFI_UNICAST) {
/* Total Path Attribute Length */
stream_putw(s, 0);
} else {
/* Convert AFI, SAFI to values for packet. */
bgp_map_afi_safi_int2iana(afi, safi, &pkt_afi, &pkt_safi);
/* Total Path Attribute Length */
stream_putw(s, 6);
stream_putc(s, BGP_ATTR_FLAG_OPTIONAL);
stream_putc(s, BGP_ATTR_MP_UNREACH_NLRI);
stream_putc(s, 3);
stream_putw(s, pkt_afi);
stream_putc(s, pkt_safi);
}
bgp_packet_set_size(s);
for (ALL_LIST_ELEMENTS_RO(bmp->targets->bgp->peer, node, peer)) {
if (!peer->afc_nego[afi][safi])
continue;
s2 = stream_new(BGP_MAX_PACKET_SIZE);
bmp_common_hdr(s2, BMP_VERSION_3,
BMP_TYPE_ROUTE_MONITORING);
bmp_per_peer_hdr(s2, peer, flags, NULL);
stream_putl_at(s2, BMP_LENGTH_POS,
stream_get_endp(s) + stream_get_endp(s2));
bmp->cnt_update++;
pullwr_write_stream(bmp->pullwr, s2);
pullwr_write_stream(bmp->pullwr, s);
stream_free(s2);
}
stream_free(s);
}
static struct stream *bmp_update(const struct prefix *p, struct peer *peer,
struct attr *attr, afi_t afi, safi_t safi)
{
struct bpacket_attr_vec_arr vecarr;
struct stream *s;
size_t attrlen_pos = 0, mpattrlen_pos = 0;
bgp_size_t total_attr_len = 0;
bpacket_attr_vec_arr_reset(&vecarr);
s = stream_new(BGP_MAX_PACKET_SIZE);
bgp_packet_set_marker(s, BGP_MSG_UPDATE);
/* 2: withdrawn routes length */
stream_putw(s, 0);
/* 3: total attributes length - attrlen_pos stores the position */
attrlen_pos = stream_get_endp(s);
stream_putw(s, 0);
/* 5: Encode all the attributes, except MP_REACH_NLRI attr. */
total_attr_len = bgp_packet_attribute(NULL, peer, s, attr,
&vecarr, NULL, afi, safi, peer, NULL, NULL, 0, 0, 0);
/* space check? */
/* peer_cap_enhe & add-path removed */
if (afi == AFI_IP && safi == SAFI_UNICAST)
stream_put_prefix(s, p);
else {
size_t p1 = stream_get_endp(s);
/* MPLS removed for now */
mpattrlen_pos = bgp_packet_mpattr_start(s, peer, afi, safi,
&vecarr, attr);
bgp_packet_mpattr_prefix(s, afi, safi, p, NULL, NULL, 0,
0, 0, attr);
bgp_packet_mpattr_end(s, mpattrlen_pos);
total_attr_len += stream_get_endp(s) - p1;
}
/* set the total attribute length correctly */
stream_putw_at(s, attrlen_pos, total_attr_len);
bgp_packet_set_size(s);
return s;
}
static struct stream *bmp_withdraw(const struct prefix *p, afi_t afi,
safi_t safi)
{
struct stream *s;
size_t attrlen_pos = 0, mp_start, mplen_pos;
bgp_size_t total_attr_len = 0;
bgp_size_t unfeasible_len;
s = stream_new(BGP_MAX_PACKET_SIZE);
bgp_packet_set_marker(s, BGP_MSG_UPDATE);
stream_putw(s, 0);
if (afi == AFI_IP && safi == SAFI_UNICAST) {
stream_put_prefix(s, p);
unfeasible_len = stream_get_endp(s) - BGP_HEADER_SIZE
- BGP_UNFEASIBLE_LEN;
stream_putw_at(s, BGP_HEADER_SIZE, unfeasible_len);
stream_putw(s, 0);
} else {
attrlen_pos = stream_get_endp(s);
/* total attr length = 0 for now. reevaluate later */
stream_putw(s, 0);
mp_start = stream_get_endp(s);
mplen_pos = bgp_packet_mpunreach_start(s, afi, safi);
bgp_packet_mpunreach_prefix(s, p, afi, safi, NULL, NULL, 0,
0, 0, NULL);
/* Set the mp_unreach attr's length */
bgp_packet_mpunreach_end(s, mplen_pos);
/* Set total path attribute length. */
total_attr_len = stream_get_endp(s) - mp_start;
stream_putw_at(s, attrlen_pos, total_attr_len);
}
bgp_packet_set_size(s);
return s;
}
static void bmp_monitor(struct bmp *bmp, struct peer *peer, uint8_t flags,
const struct prefix *p, struct attr *attr, afi_t afi,
safi_t safi, time_t uptime)
{
struct stream *hdr, *msg;
struct timeval tv = { .tv_sec = uptime, .tv_usec = 0 };
if (attr)
msg = bmp_update(p, peer, attr, afi, safi);
else
msg = bmp_withdraw(p, afi, safi);
hdr = stream_new(BGP_MAX_PACKET_SIZE);
bmp_common_hdr(hdr, BMP_VERSION_3, BMP_TYPE_ROUTE_MONITORING);
bmp_per_peer_hdr(hdr, peer, flags, &tv);
stream_putl_at(hdr, BMP_LENGTH_POS,
stream_get_endp(hdr) + stream_get_endp(msg));
bmp->cnt_update++;
pullwr_write_stream(bmp->pullwr, hdr);
pullwr_write_stream(bmp->pullwr, msg);
stream_free(hdr);
stream_free(msg);
}
static bool bmp_wrsync(struct bmp *bmp, struct pullwr *pullwr)
{
afi_t afi;
safi_t safi;
if (bmp->syncafi == AFI_MAX) {
FOREACH_AFI_SAFI (afi, safi) {
if (bmp->afistate[afi][safi] != BMP_AFI_NEEDSYNC)
continue;
bmp->afistate[afi][safi] = BMP_AFI_SYNC;
bmp->syncafi = afi;
bmp->syncsafi = safi;
bmp->syncpeerid = 0;
memset(&bmp->syncpos, 0, sizeof(bmp->syncpos));
bmp->syncpos.family = afi2family(afi);
zlog_info("bmp[%s] %s %s sending table",
bmp->remote,
afi2str(bmp->syncafi),
safi2str(bmp->syncsafi));
/* break does not work here, 2 loops... */
goto afibreak;
}
if (bmp->syncafi == AFI_MAX)
return false;
}
afibreak:
afi = bmp->syncafi;
safi = bmp->syncsafi;
if (!bmp->targets->afimon[afi][safi]) {
/* shouldn't happen */
bmp->afistate[afi][safi] = BMP_AFI_INACTIVE;
bmp->syncafi = AFI_MAX;
bmp->syncsafi = SAFI_MAX;
return true;
}
struct bgp_table *table = bmp->targets->bgp->rib[afi][safi];
struct bgp_node *bn;
struct bgp_path_info *bpi = NULL, *bpiter;
struct bgp_adj_in *adjin = NULL, *adjiter;
bn = bgp_node_lookup(table, &bmp->syncpos);
do {
if (!bn) {
bn = bgp_table_get_next(table, &bmp->syncpos);
if (!bn) {
zlog_info("bmp[%s] %s %s table completed (EoR)",
bmp->remote, afi2str(afi),
safi2str(safi));
bmp_eor(bmp, afi, safi, BMP_PEER_FLAG_L);
bmp_eor(bmp, afi, safi, 0);
bmp->afistate[afi][safi] = BMP_AFI_LIVE;
bmp->syncafi = AFI_MAX;
bmp->syncsafi = SAFI_MAX;
return true;
}
bmp->syncpeerid = 0;
prefix_copy(&bmp->syncpos, bgp_node_get_prefix(bn));
}
if (bmp->targets->afimon[afi][safi] & BMP_MON_POSTPOLICY) {
for (bpiter = bn->info; bpiter; bpiter = bpiter->next) {
if (!CHECK_FLAG(bpiter->flags, BGP_PATH_VALID))
continue;
if (bpiter->peer->qobj_node.nid
<= bmp->syncpeerid)
continue;
if (bpi && bpiter->peer->qobj_node.nid
> bpi->peer->qobj_node.nid)
continue;
bpi = bpiter;
}
}
if (bmp->targets->afimon[afi][safi] & BMP_MON_PREPOLICY) {
for (adjiter = bn->adj_in; adjiter;
adjiter = adjiter->next) {
if (adjiter->peer->qobj_node.nid
<= bmp->syncpeerid)
continue;
if (adjin && adjiter->peer->qobj_node.nid
> adjin->peer->qobj_node.nid)
continue;
adjin = adjiter;
}
}
if (bpi || adjin)
break;
bn = NULL;
} while (1);
if (adjin && bpi
&& adjin->peer->qobj_node.nid < bpi->peer->qobj_node.nid) {
bpi = NULL;
bmp->syncpeerid = adjin->peer->qobj_node.nid;
} else if (adjin && bpi
&& adjin->peer->qobj_node.nid > bpi->peer->qobj_node.nid) {
adjin = NULL;
bmp->syncpeerid = bpi->peer->qobj_node.nid;
} else if (bpi) {
bmp->syncpeerid = bpi->peer->qobj_node.nid;
} else if (adjin) {
bmp->syncpeerid = adjin->peer->qobj_node.nid;
}
const struct prefix *bn_p = bgp_node_get_prefix(bn);
if (bpi)
bmp_monitor(bmp, bpi->peer, BMP_PEER_FLAG_L, bn_p, bpi->attr,
afi, safi, bpi->uptime);
if (adjin)
bmp_monitor(bmp, adjin->peer, 0, bn_p, adjin->attr, afi, safi,
adjin->uptime);