bgp_packet.c
上传用户:xiaozhuqw
上传日期:2009-11-15
资源大小:1338k
文件大小:61k
- /* BGP packet management routine.
- Copyright (C) 1999 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>
- #include "thread.h"
- #include "stream.h"
- #include "network.h"
- #include "prefix.h"
- #include "command.h"
- #include "log.h"
- #include "memory.h"
- #include "sockunion.h" /* for inet_ntop () */
- #include "linklist.h"
- #include "plist.h"
- #include "bgpd/bgpd.h"
- #include "bgpd/bgp_table.h"
- #include "bgpd/bgp_dump.h"
- #include "bgpd/bgp_attr.h"
- #include "bgpd/bgp_debug.h"
- #include "bgpd/bgp_fsm.h"
- #include "bgpd/bgp_route.h"
- #include "bgpd/bgp_packet.h"
- #include "bgpd/bgp_open.h"
- #include "bgpd/bgp_aspath.h"
- #include "bgpd/bgp_community.h"
- #include "bgpd/bgp_ecommunity.h"
- #include "bgpd/bgp_network.h"
- #include "bgpd/bgp_mplsvpn.h"
- #include "bgpd/bgp_advertise.h"
- #include "bgpd/bgp_vty.h"
- int stream_put_prefix (struct stream *, struct prefix *);
- /* Set up BGP packet marker and packet type. */
- static int
- bgp_packet_set_marker (struct stream *s, u_char type)
- {
- int i;
- /* Fill in marker. */
- for (i = 0; i < BGP_MARKER_SIZE; i++)
- stream_putc (s, 0xff);
- /* Dummy total length. This field is should be filled in later on. */
- stream_putw (s, 0);
- /* BGP packet type. */
- stream_putc (s, type);
- /* Return current stream size. */
- return stream_get_putp (s);
- }
- /* Set BGP packet header size entry. If size is zero then use current
- stream size. */
- static int
- bgp_packet_set_size (struct stream *s)
- {
- int cp;
- /* Preserve current pointer. */
- cp = stream_get_putp (s);
- stream_set_putp (s, BGP_MARKER_SIZE);
- stream_putw (s, cp);
- /* Write back current pointer. */
- stream_set_putp (s, cp);
- return cp;
- }
- /* Add new packet to the peer. */
- void
- bgp_packet_add (struct peer *peer, struct stream *s)
- {
- /* Add packet to the end of list. */
- stream_fifo_push (peer->obuf, s);
- }
- /* Free first packet. */
- void
- bgp_packet_delete (struct peer *peer)
- {
- stream_free (stream_fifo_pop (peer->obuf));
- }
- /* Duplicate packet. */
- struct stream *
- bgp_packet_dup (struct stream *s)
- {
- struct stream *new;
- new = stream_new (stream_get_endp (s));
- new->endp = s->endp;
- new->putp = s->putp;
- new->getp = s->getp;
- memcpy (new->data, s->data, stream_get_endp (s));
- return new;
- }
- /* Check file descriptor whether connect is established. */
- static void
- bgp_connect_check (struct peer *peer)
- {
- int status;
- int slen;
- int ret;
- /* Anyway I have to reset read and write thread. */
- BGP_READ_OFF (peer->t_read);
- BGP_WRITE_OFF (peer->t_write);
- /* Check file descriptor. */
- slen = sizeof (status);
- ret = getsockopt(peer->fd, SOL_SOCKET, SO_ERROR, (void *) &status, &slen);
- /* If getsockopt is fail, this is fatal error. */
- if (ret < 0)
- {
- zlog (peer->log, LOG_INFO, "can't get sockopt for nonblocking connect");
- BGP_EVENT_ADD (peer, TCP_fatal_error);
- return;
- }
- /* When status is 0 then TCP connection is established. */
- if (status == 0)
- {
- BGP_EVENT_ADD (peer, TCP_connection_open);
- }
- else
- {
- if (BGP_DEBUG (events, EVENTS))
- plog_info (peer->log, "%s [Event] Connect failed (%s)",
- peer->host, strerror (errno));
- BGP_EVENT_ADD (peer, TCP_connection_open_failed);
- }
- }
- /* Make BGP update packet. */
- struct stream *
- bgp_update_packet (struct peer *peer, afi_t afi, safi_t safi)
- {
- struct stream *s;
- struct bgp_adj_out *adj;
- struct bgp_advertise *adv;
- struct stream *packet;
- struct bgp_node *rn = NULL;
- struct bgp_info *binfo = NULL;
- bgp_size_t total_attr_len = 0;
- unsigned long pos;
- char buf[BUFSIZ];
- struct prefix_rd *prd = NULL;
- char *tag = NULL;
- s = peer->work;
- stream_reset (s);
- adv = FIFO_HEAD (&peer->sync[afi][safi]->update);
- while (adv)
- {
- if (adv->rn)
- rn = adv->rn;
- adj = adv->adj;
- if (adv->binfo)
- binfo = adv->binfo;
- #ifdef MPLS_VPN
- if (rn)
- prd = (struct prefix_rd *) &rn->prn->p;
- if (binfo)
- tag = binfo->tag;
- #endif /* MPLS_VPN */
- /* When remaining space can't include NLRI and it's length. */
- if (rn && STREAM_REMAIN (s) <= BGP_NLRI_LENGTH + PSIZE (rn->p.prefixlen))
- break;
- /* If packet is empty, set attribute. */
- if (stream_empty (s))
- {
- bgp_packet_set_marker (s, BGP_MSG_UPDATE);
- stream_putw (s, 0);
- pos = stream_get_putp (s);
- stream_putw (s, 0);
- total_attr_len = bgp_packet_attribute (NULL, peer, s,
- adv->baa->attr,
- &rn->p, afi, safi,
- binfo->peer, prd, tag);
- stream_putw_at (s, pos, total_attr_len);
- }
- if (afi == AFI_IP && safi == SAFI_UNICAST)
- stream_put_prefix (s, &rn->p);
-
- if (BGP_DEBUG (update, UPDATE_OUT))
- zlog (peer->log, LOG_INFO, "%s send UPDATE %s/%d",
- peer->host,
- inet_ntop (rn->p.family, &(rn->p.u.prefix), buf, BUFSIZ),
- rn->p.prefixlen);
- /* Synchnorize attribute. */
- if (adj->attr)
- bgp_attr_unintern (adj->attr);
- else
- peer->scount[afi][safi]++;
- adj->attr = bgp_attr_intern (adv->baa->attr);
- adv = bgp_advertise_clean (peer, adj, afi, safi);
- if (! (afi == AFI_IP && safi == SAFI_UNICAST))
- break;
- }
- if (! stream_empty (s))
- {
- bgp_packet_set_size (s);
- packet = bgp_packet_dup (s);
- bgp_packet_add (peer, packet);
- stream_reset (s);
- return packet;
- }
- return NULL;
- }
- struct stream *
- bgp_update_packet_eor (struct peer *peer, afi_t afi, safi_t safi)
- {
- struct stream *s;
- struct stream *packet;
- if (BGP_DEBUG (normal, NORMAL))
- zlog_info ("Send End-of-RIB for AF %s to neighbor %s",
- afi_safi_print(afi, safi), peer->host);
- 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
- {
- /* 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, afi);
- stream_putc (s, safi);
- }
- bgp_packet_set_size (s);
- packet = bgp_packet_dup (s);
- bgp_packet_add (peer, packet);
- stream_free (s);
- return packet;
- }
- /* Make BGP withdraw packet. */
- struct stream *
- bgp_withdraw_packet (struct peer *peer, afi_t afi, safi_t safi)
- {
- struct stream *s;
- struct stream *packet;
- struct bgp_adj_out *adj;
- struct bgp_advertise *adv;
- struct bgp_node *rn;
- unsigned long pos;
- bgp_size_t unfeasible_len;
- bgp_size_t total_attr_len;
- char buf[BUFSIZ];
- struct prefix_rd *prd = NULL;
- s = peer->work;
- stream_reset (s);
- while ((adv = FIFO_HEAD (&peer->sync[afi][safi]->withdraw)) != NULL)
- {
- adj = adv->adj;
- rn = adv->rn;
- #ifdef MPLS_VPN
- prd = (struct prefix_rd *) &rn->prn->p;
- #endif /* MPLS_VPN */
- if (STREAM_REMAIN (s)
- < (BGP_NLRI_LENGTH + BGP_TOTAL_ATTR_LEN + PSIZE (rn->p.prefixlen)))
- break;
- if (stream_empty (s))
- {
- bgp_packet_set_marker (s, BGP_MSG_UPDATE);
- stream_putw (s, 0);
- }
- if (afi == AFI_IP && safi == SAFI_UNICAST)
- stream_put_prefix (s, &rn->p);
- else
- {
- pos = stream_get_putp (s);
- stream_putw (s, 0);
- total_attr_len
- = bgp_packet_withdraw (peer, s, &rn->p, afi, safi, prd, NULL);
-
- /* Set total path attribute length. */
- stream_putw_at (s, pos, total_attr_len);
- }
- if (BGP_DEBUG (update, UPDATE_OUT))
- zlog (peer->log, LOG_INFO, "%s send UPDATE %s/%d -- unreachable",
- peer->host,
- inet_ntop (rn->p.family, &(rn->p.u.prefix), buf, BUFSIZ),
- rn->p.prefixlen);
- peer->scount[afi][safi]--;
- bgp_adj_out_remove (rn, adj, peer, afi, safi);
- bgp_unlock_node (rn);
- if (! (afi == AFI_IP && safi == SAFI_UNICAST))
- break;
- }
- if (! stream_empty (s))
- {
- if (afi == AFI_IP && safi == SAFI_UNICAST)
- {
- unfeasible_len
- = stream_get_putp (s) - BGP_HEADER_SIZE - BGP_UNFEASIBLE_LEN;
- stream_putw_at (s, BGP_HEADER_SIZE, unfeasible_len);
- stream_putw (s, 0);
- }
- bgp_packet_set_size (s);
- packet = bgp_packet_dup (s);
- bgp_packet_add (peer, packet);
- stream_reset (s);
- return packet;
- }
- return NULL;
- }
- void
- bgp_default_update_send (struct peer *peer, struct attr *attr,
- afi_t afi, safi_t safi, struct peer *from)
- {
- struct stream *s;
- struct stream *packet;
- struct prefix p;
- unsigned long pos;
- bgp_size_t total_attr_len;
- char attrstr[BUFSIZ];
- char buf[BUFSIZ];
- #ifdef DISABLE_BGP_ANNOUNCE
- return;
- #endif /* DISABLE_BGP_ANNOUNCE */
- if (afi == AFI_IP)
- str2prefix ("0.0.0.0/0", &p);
- #ifdef HAVE_IPV6
- else
- str2prefix ("::/0", &p);
- #endif /* HAVE_IPV6 */
- /* Logging the attribute. */
- if (BGP_DEBUG (update, UPDATE_OUT))
- {
- bgp_dump_attr (peer, attr, attrstr, BUFSIZ);
- zlog (peer->log, LOG_INFO, "%s send UPDATE %s/%d %s",
- peer->host, inet_ntop(p.family, &(p.u.prefix), buf, BUFSIZ),
- p.prefixlen, attrstr);
- }
- 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);
- /* Make place for total attribute length. */
- pos = stream_get_putp (s);
- stream_putw (s, 0);
- total_attr_len = bgp_packet_attribute (NULL, peer, s, attr, &p, afi, safi, from, NULL, NULL);
- /* Set Total Path Attribute Length. */
- stream_putw_at (s, pos, total_attr_len);
- /* NLRI set. */
- if (p.family == AF_INET && safi == SAFI_UNICAST)
- stream_put_prefix (s, &p);
- /* Set size. */
- bgp_packet_set_size (s);
- packet = bgp_packet_dup (s);
- stream_free (s);
- /* Dump packet if debug option is set. */
- #ifdef DEBUG
- bgp_packet_dump (packet);
- #endif /* DEBUG */
- /* Add packet to the peer. */
- bgp_packet_add (peer, packet);
- BGP_WRITE_ON (peer->t_write, bgp_write, peer->fd);
- }
- void
- bgp_default_withdraw_send (struct peer *peer, afi_t afi, safi_t safi)
- {
- struct stream *s;
- struct stream *packet;
- struct prefix p;
- unsigned long pos;
- unsigned long cp;
- bgp_size_t unfeasible_len;
- bgp_size_t total_attr_len;
- char buf[BUFSIZ];
- #ifdef DISABLE_BGP_ANNOUNCE
- return;
- #endif /* DISABLE_BGP_ANNOUNCE */
- if (afi == AFI_IP)
- str2prefix ("0.0.0.0/0", &p);
- #ifdef HAVE_IPV6
- else
- str2prefix ("::/0", &p);
- #endif /* HAVE_IPV6 */
- total_attr_len = 0;
- pos = 0;
- if (BGP_DEBUG (update, UPDATE_OUT))
- zlog (peer->log, LOG_INFO, "%s send UPDATE %s/%d -- unreachable",
- peer->host, inet_ntop(p.family, &(p.u.prefix), buf, BUFSIZ),
- p.prefixlen);
- s = stream_new (BGP_MAX_PACKET_SIZE);
- /* Make BGP update packet. */
- bgp_packet_set_marker (s, BGP_MSG_UPDATE);
- /* Unfeasible Routes Length. */;
- cp = stream_get_putp (s);
- stream_putw (s, 0);
- /* Withdrawn Routes. */
- if (p.family == AF_INET && safi == SAFI_UNICAST)
- {
- stream_put_prefix (s, &p);
- unfeasible_len = stream_get_putp (s) - cp - 2;
- /* Set unfeasible len. */
- stream_putw_at (s, cp, unfeasible_len);
- /* Set total path attribute length. */
- stream_putw (s, 0);
- }
- else
- {
- pos = stream_get_putp (s);
- stream_putw (s, 0);
- total_attr_len = bgp_packet_withdraw (peer, s, &p, afi, safi, NULL, NULL);
- /* Set total path attribute length. */
- stream_putw_at (s, pos, total_attr_len);
- }
- bgp_packet_set_size (s);
- packet = bgp_packet_dup (s);
- stream_free (s);
- /* Add packet to the peer. */
- bgp_packet_add (peer, packet);
- BGP_WRITE_ON (peer->t_write, bgp_write, peer->fd);
- }
- /* Get next packet to be written. */
- struct stream *
- bgp_write_packet (struct peer *peer)
- {
- afi_t afi;
- safi_t safi;
- struct stream *s = NULL;
- struct bgp_advertise *adv;
- s = stream_fifo_head (peer->obuf);
- if (s)
- return s;
- for (afi = AFI_IP; afi < AFI_MAX; afi++)
- for (safi = SAFI_UNICAST; safi < SAFI_MAX; safi++)
- {
- adv = FIFO_HEAD (&peer->sync[afi][safi]->withdraw);
- if (adv)
- {
- s = bgp_withdraw_packet (peer, afi, safi);
- if (s)
- return s;
- }
- }
-
- for (afi = AFI_IP; afi < AFI_MAX; afi++)
- for (safi = SAFI_UNICAST; safi < SAFI_MAX; safi++)
- {
- adv = FIFO_HEAD (&peer->sync[afi][safi]->update);
- if (adv)
- {
- if (adv->binfo && adv->binfo->uptime < peer->synctime[afi][safi])
- {
- if (CHECK_FLAG (adv->binfo->peer->cap, PEER_CAP_RESTART_RCV)
- && CHECK_FLAG (adv->binfo->peer->cap, PEER_CAP_RESTART_ADV)
- && ! CHECK_FLAG (adv->binfo->flags, BGP_INFO_STALE)
- && safi != SAFI_MPLS_VPN)
- {
- if (CHECK_FLAG (adv->binfo->peer->af_sflags[afi][safi],
- PEER_STATUS_EOR_RECEIVED))
- s = bgp_update_packet (peer, afi, safi);
- }
- else
- s = bgp_update_packet (peer, afi, safi);
- }
- if (s)
- return s;
- }
- if (CHECK_FLAG (peer->cap, PEER_CAP_RESTART_RCV))
- {
- if (peer->afc_nego[afi][safi] && peer->synctime[afi][safi]
- && ! CHECK_FLAG (peer->af_sflags[afi][safi], PEER_STATUS_EOR_SEND)
- && safi != SAFI_MPLS_VPN)
- {
- SET_FLAG (peer->af_sflags[afi][safi], PEER_STATUS_EOR_SEND);
- return bgp_update_packet_eor (peer, afi, safi);
- }
- }
- }
- return NULL;
- }
- /* Is there partially written packet or updates we can send right
- now. */
- int
- bgp_write_proceed (struct peer *peer)
- {
- afi_t afi;
- safi_t safi;
- struct bgp_advertise *adv;
- if (stream_fifo_head (peer->obuf))
- return 1;
- for (afi = AFI_IP; afi < AFI_MAX; afi++)
- for (safi = SAFI_UNICAST; safi < SAFI_MAX; safi++)
- if (FIFO_HEAD (&peer->sync[afi][safi]->withdraw))
- return 1;
- for (afi = AFI_IP; afi < AFI_MAX; afi++)
- for (safi = SAFI_UNICAST; safi < SAFI_MAX; safi++)
- if ((adv = FIFO_HEAD (&peer->sync[afi][safi]->update)) != NULL)
- if (adv->binfo->uptime < peer->synctime[afi][safi])
- return 1;
- return 0;
- }
- /* Write packet to the peer. */
- int
- bgp_write (struct thread *thread)
- {
- struct peer *peer;
- u_char type;
- struct stream *s;
- int num;
- int count = 0;
- int write_errno;
- /* Yes first of all get peer pointer. */
- peer = THREAD_ARG (thread);
- peer->t_write = NULL;
- /* For non-blocking IO check. */
- if (peer->status == Connect)
- {
- bgp_connect_check (peer);
- return 0;
- }
- /* Nonblocking write until TCP output buffer is full. */
- while (1)
- {
- int writenum;
- s = bgp_write_packet (peer);
- if (! s)
- return 0;
- /* Number of bytes to be sent. */
- writenum = stream_get_endp (s) - stream_get_getp (s);
- /* Call write() system call. */
- num = write (peer->fd, STREAM_PNT (s), writenum);
- write_errno = errno;
- if (num <= 0)
- {
- /* Partial write. */
- if (write_errno == EWOULDBLOCK || write_errno == EAGAIN)
- break;
- bgp_stop (peer);
- peer->status = Idle;
- bgp_timer_set (peer);
- return 0;
- }
- if (num != writenum)
- {
- stream_forward (s, num);
- if (write_errno == EAGAIN)
- break;
- continue;
- }
- /* Retrieve BGP packet type. */
- stream_set_getp (s, BGP_MARKER_SIZE + 2);
- type = stream_getc (s);
- switch (type)
- {
- case BGP_MSG_OPEN:
- peer->open_out++;
- break;
- case BGP_MSG_UPDATE:
- peer->update_out++;
- break;
- case BGP_MSG_NOTIFY:
- peer->notify_out++;
- /* BGP_EVENT_ADD (peer, BGP_Stop); */
- bgp_stop_with_error (peer);
- bgp_fsm_change_status (peer, Idle);
- bgp_timer_set (peer);
- return 0;
- break;
- case BGP_MSG_KEEPALIVE:
- peer->keepalive_out++;
- break;
- case BGP_MSG_ROUTE_REFRESH_NEW:
- case BGP_MSG_ROUTE_REFRESH_OLD:
- peer->refresh_out++;
- break;
- case BGP_MSG_CAPABILITY:
- peer->dynamic_cap_out++;
- break;
- }
- /* OK we send packet so delete it. */
- bgp_packet_delete (peer);
- if (++count >= BGP_WRITE_PACKET_MAX)
- break;
- }
-
- if (bgp_write_proceed (peer))
- BGP_WRITE_ON (peer->t_write, bgp_write, peer->fd);
-
- return 0;
- }
- /* This is only for sending NOTIFICATION message to neighbor. */
- int
- bgp_write_notify (struct peer *peer)
- {
- int ret;
- u_char type;
- struct stream *s;
- /* There should be at least one packet. */
- s = stream_fifo_head (peer->obuf);
- if (!s)
- return 0;
- assert (stream_get_endp (s) >= BGP_HEADER_SIZE);
- /* I'm not sure fd is writable. */
- ret = writen (peer->fd, STREAM_DATA (s), stream_get_endp (s));
- if (ret <= 0)
- {
- bgp_stop (peer);
- peer->status = Idle;
- bgp_timer_set (peer);
- return 0;
- }
- /* Retrieve BGP packet type. */
- stream_set_getp (s, BGP_MARKER_SIZE + 2);
- type = stream_getc (s);
- assert (type == BGP_MSG_NOTIFY);
- /* Type should be notify. */
- peer->notify_out++;
- /* We don't call event manager at here for avoiding other events. */
- if (peer->status == Established)
- bgp_stop (peer);
- else
- {
- bgp_stop_with_error (peer);
- bgp_fsm_change_status (peer, Idle);
- }
- bgp_timer_set (peer);
- return 0;
- }
- /* Make keepalive packet and send it to the peer. */
- void
- bgp_keepalive_send (struct peer *peer)
- {
- struct stream *s;
- int length;
- s = stream_new (BGP_MAX_PACKET_SIZE);
- /* Make keepalive packet. */
- bgp_packet_set_marker (s, BGP_MSG_KEEPALIVE);
- /* Set packet size. */
- length = bgp_packet_set_size (s);
- /* Dump packet if debug option is set. */
- /* bgp_packet_dump (s); */
-
- if (BGP_DEBUG (keepalive, KEEPALIVE))
- zlog_info ("%s sending KEEPALIVE", peer->host);
- /* Add packet to the peer. */
- bgp_packet_add (peer, s);
- BGP_WRITE_ON (peer->t_write, bgp_write, peer->fd);
- }
- /* Make open packet and send it to the peer. */
- void
- bgp_open_send (struct peer *peer)
- {
- struct stream *s;
- int length;
- u_int16_t send_holdtime;
- as_t local_as;
- if (CHECK_FLAG (peer->config, PEER_CONFIG_TIMER))
- send_holdtime = peer->holdtime;
- else
- send_holdtime = peer->bgp->default_holdtime;
- /* local-as Change */
- if (peer->change_local_as)
- local_as = peer->change_local_as;
- else
- local_as = peer->local_as;
- s = stream_new (BGP_MAX_PACKET_SIZE);
- /* Make open packet. */
- bgp_packet_set_marker (s, BGP_MSG_OPEN);
- /* Set open packet values. */
- stream_putc (s, BGP_VERSION_4); /* BGP version */
- stream_putw (s, local_as); /* My Autonomous System*/
- stream_putw (s, send_holdtime); /* Hold Time */
- stream_put_in_addr (s, &peer->local_id); /* BGP Identifier */
- /* Set capability code. */
- bgp_open_capability (s, peer);
- /* Set BGP packet length. */
- length = bgp_packet_set_size (s);
- if (BGP_DEBUG (normal, NORMAL))
- zlog_info ("%s sending OPEN, version %d, my as %d, holdtime %d, id %s",
- peer->host, BGP_VERSION_4, local_as,
- send_holdtime, inet_ntoa (peer->local_id));
- if (BGP_DEBUG (normal, NORMAL))
- zlog_info ("%s send message type %d, length (incl. header) %d",
- peer->host, BGP_MSG_OPEN, length);
- /* Dump packet if debug option is set. */
- /* bgp_packet_dump (s); */
- /* Add packet to the peer. */
- bgp_packet_add (peer, s);
- BGP_WRITE_ON (peer->t_write, bgp_write, peer->fd);
- }
- /* Send BGP notify packet with data potion. */
- void
- bgp_notify_send_with_data (struct peer *peer, u_char code, u_char sub_code,
- u_char *data, size_t datalen)
- {
- struct stream *s;
- int length;
- /* Allocate new stream. */
- s = stream_new (BGP_MAX_PACKET_SIZE);
- /* Make nitify packet. */
- bgp_packet_set_marker (s, BGP_MSG_NOTIFY);
- /* Set notify packet values. */
- stream_putc (s, code); /* BGP notify code */
- stream_putc (s, sub_code); /* BGP notify sub_code */
- /* If notify data is present. */
- if (data)
- stream_write (s, data, datalen);
-
- /* Set BGP packet length. */
- length = bgp_packet_set_size (s);
-
- /* Add packet to the peer. */
- stream_fifo_clean (peer->obuf);
- bgp_packet_add (peer, s);
- /* For debug */
- {
- struct bgp_notify bgp_notify;
- int first = 0;
- int i;
- char c[4];
- bgp_notify.code = code;
- bgp_notify.subcode = sub_code;
- bgp_notify.data = NULL;
- bgp_notify.length = length - BGP_MSG_NOTIFY_MIN_SIZE;
-
- if (bgp_notify.length)
- {
- bgp_notify.data = XMALLOC (MTYPE_TMP, bgp_notify.length * 3);
- for (i = 0; i < bgp_notify.length; i++)
- if (first)
- {
- sprintf (c, " %02x", data[i]);
- strcat (bgp_notify.data, c);
- }
- else
- {
- first = 1;
- sprintf (c, "%02x", data[i]);
- strcpy (bgp_notify.data, c);
- }
- }
- bgp_notify_print (peer, &bgp_notify, "sending");
- if (bgp_notify.data)
- XFREE (MTYPE_TMP, bgp_notify.data);
- }
- if (BGP_DEBUG (normal, NORMAL))
- zlog_info ("%s send message type %d, length (incl. header) %d",
- peer->host, BGP_MSG_NOTIFY, length);
- /* peer reset cause */
- if (sub_code != BGP_NOTIFY_CEASE_CONFIG_CHANGE)
- {
- if (sub_code == BGP_NOTIFY_CEASE_ADMIN_RESET)
- peer->last_reset = PEER_DOWN_USER_RESET;
- else if (sub_code == BGP_NOTIFY_CEASE_ADMIN_SHUTDOWN)
- peer->last_reset = PEER_DOWN_USER_SHUTDOWN;
- else if (sub_code == BGP_NOTIFY_CEASE_PEER_UNCONFIG)
- peer->last_reset = PEER_DOWN_NEIGHBOR_DELETE;
- else
- peer->last_reset = PEER_DOWN_NOTIFY_SEND;
- }
- /* Call imidiately. */
- BGP_WRITE_OFF (peer->t_write);
- bgp_write_notify (peer);
- }
- /* Send BGP notify packet. */
- void
- bgp_notify_send (struct peer *peer, u_char code, u_char sub_code)
- {
- bgp_notify_send_with_data (peer, code, sub_code, NULL, 0);
- }
- char *
- afi2str (afi_t afi)
- {
- if (afi == AFI_IP)
- return "AFI_IP";
- else if (afi == AFI_IP6)
- return "AFI_IP6";
- else
- return "Unknown AFI";
- }
- char *
- safi2str (safi_t safi)
- {
- if (safi == SAFI_UNICAST)
- return "SAFI_UNICAST";
- else if (safi == SAFI_MULTICAST)
- return "SAFI_MULTICAST";
- else if (safi == SAFI_MPLS_VPN || safi == BGP_SAFI_VPNV4)
- return "SAFI_MPLS_VPN";
- else
- return "Unknown SAFI";
- }
- /* Send route refresh message to the peer. */
- void
- bgp_route_refresh_send (struct peer *peer, afi_t afi, safi_t safi,
- u_char orf_type, u_char when_to_refresh, int remove)
- {
- struct stream *s;
- struct stream *packet;
- int length;
- struct bgp_filter *filter;
- int orf_refresh = 0;
- int msg_type;
- #ifdef DISABLE_BGP_ANNOUNCE
- return;
- #endif /* DISABLE_BGP_ANNOUNCE */
- if (CHECK_FLAG (peer->cap, PEER_CAP_REFRESH_NEW_RCV))
- msg_type = BGP_MSG_ROUTE_REFRESH_NEW;
- else
- msg_type = BGP_MSG_ROUTE_REFRESH_OLD;
- filter = &peer->filter[afi][safi];
- /* Adjust safi code. */
- if (safi == SAFI_MPLS_VPN)
- safi = BGP_SAFI_VPNV4;
-
- s = stream_new (BGP_MAX_PACKET_SIZE);
- /* Make BGP update packet. */
- bgp_packet_set_marker (s, msg_type);
- /* Encode Route Refresh message. */
- stream_putw (s, afi);
- stream_putc (s, 0);
- stream_putc (s, safi);
-
- if (orf_type == ORF_TYPE_PREFIX
- || orf_type == ORF_TYPE_PREFIX_OLD)
- if (remove || filter->plist[FILTER_IN].plist)
- {
- u_int16_t orf_len;
- unsigned long orfp;
- orf_refresh = 1;
- stream_putc (s, when_to_refresh);
- stream_putc (s, orf_type);
- orfp = stream_get_putp (s);
- stream_putw (s, 0);
- if (remove)
- {
- UNSET_FLAG (peer->af_sflags[afi][safi], PEER_STATUS_ORF_PREFIX_SEND);
- stream_putc (s, ORF_COMMON_PART_REMOVE_ALL);
- if (BGP_DEBUG (normal, NORMAL))
- zlog_info ("%s sending REFRESH_REQ to remove ORF(%d) (%s) for afi/safi: %d/%d",
- peer->host, orf_type,
- (when_to_refresh == REFRESH_DEFER ? "defer" : "immediate"),
- afi, safi);
- }
- else
- {
- SET_FLAG (peer->af_sflags[afi][safi], PEER_STATUS_ORF_PREFIX_SEND);
- prefix_bgp_orf_entry (s, filter->plist[FILTER_IN].plist,
- ORF_COMMON_PART_ADD, ORF_COMMON_PART_PERMIT,
- ORF_COMMON_PART_DENY);
- if (BGP_DEBUG (normal, NORMAL))
- zlog_info ("%s sending REFRESH_REQ with pfxlist ORF(%d) (%s) for afi/safi: %d/%d",
- peer->host, orf_type,
- (when_to_refresh == REFRESH_DEFER ? "defer" : "immediate"),
- afi, safi);
- }
- /* Total ORF Entry Len. */
- orf_len = stream_get_putp (s) - orfp - 2;
- stream_putw_at (s, orfp, orf_len);
- }
- /* Set packet size. */
- length = bgp_packet_set_size (s);
- if (BGP_DEBUG (normal, NORMAL))
- {
- if (! orf_refresh)
- zlog_info ("%s sending REFRESH_REQ(%d) for afi/safi: %d/%d",
- peer->host, msg_type, afi, safi);
- zlog_info ("%s send message type %d, length (incl. header) %d",
- peer->host, msg_type, length);
- }
- /* Make real packet. */
- packet = bgp_packet_dup (s);
- stream_free (s);
- /* Add packet to the peer. */
- bgp_packet_add (peer, packet);
- BGP_WRITE_ON (peer->t_write, bgp_write, peer->fd);
- }
- /* Send capability message to the peer. */
- void
- bgp_capability_send (struct peer *peer, afi_t afi, safi_t safi,
- int capability_code, int action)
- {
- struct stream *s;
- struct stream *packet;
- int length;
- /* Adjust safi code. */
- if (safi == SAFI_MPLS_VPN)
- safi = BGP_SAFI_VPNV4;
- s = stream_new (BGP_MAX_PACKET_SIZE);
- /* Make BGP update packet. */
- bgp_packet_set_marker (s, BGP_MSG_CAPABILITY);
- /* Encode MP_EXT capability. */
- if (capability_code == CAPABILITY_CODE_MP)
- {
- stream_putc (s, action);
- stream_putc (s, CAPABILITY_CODE_MP);
- stream_putc (s, CAPABILITY_CODE_MP_LEN);
- stream_putw (s, afi);
- stream_putc (s, 0);
- stream_putc (s, safi);
- if (BGP_DEBUG (normal, NORMAL))
- zlog_info ("%s sending CAPABILITY has %s MP_EXT CAP for afi/safi: %d/%d",
- peer->host, action == CAPABILITY_ACTION_SET ?
- "Advertising" : "Removing", afi, safi);
- }
- /* Set packet size. */
- length = bgp_packet_set_size (s);
- /* Make real packet. */
- packet = bgp_packet_dup (s);
- stream_free (s);
- /* Add packet to the peer. */
- bgp_packet_add (peer, packet);
- if (BGP_DEBUG (normal, NORMAL))
- zlog_info ("%s send message type %d, length (incl. header) %d",
- peer->host, BGP_MSG_CAPABILITY, length);
- BGP_WRITE_ON (peer->t_write, bgp_write, peer->fd);
- }
- /* RFC1771 6.8 Connection collision detection. */
- int
- bgp_collision_detect (struct peer *new, struct in_addr remote_id)
- {
- struct peer *peer;
- struct listnode *nn;
- struct bgp *bgp;
- bgp = bgp_get_default ();
- if (! bgp)
- return 0;
-
- /* Upon receipt of an OPEN message, the local system must examine
- all of its connections that are in the OpenConfirm state. A BGP
- speaker may also examine connections in an OpenSent state if it
- knows the BGP Identifier of the peer by means outside of the
- protocol. If among these connections there is a connection to a
- remote BGP speaker whose BGP Identifier equals the one in the
- OPEN message, then the local system performs the following
- collision resolution procedure: */
- LIST_LOOP (bgp->peer, peer, nn)
- {
- /* Under OpenConfirm status, local peer structure already hold
- remote router ID. */
- if (peer != new
- && (peer->status == OpenConfirm || peer->status == OpenSent)
- && sockunion_same (&peer->su, &new->su))
- {
- /* 1. The BGP Identifier of the local system is compared to
- the BGP Identifier of the remote system (as specified in
- the OPEN message). */
- if (ntohl (peer->local_id.s_addr) < ntohl (remote_id.s_addr))
- {
- /* 2. If the value of the local BGP Identifier is less
- than the remote one, the local system closes BGP
- connection that already exists (the one that is
- already in the OpenConfirm state), and accepts BGP
- connection initiated by the remote system. */
- if (peer->fd >= 0)
- bgp_notify_send (peer, BGP_NOTIFY_CEASE, BGP_NOTIFY_CEASE_CONNECT_COLLISION);
- return 1;
- }
- else
- {
- /* 3. Otherwise, the local system closes newly created
- BGP connection (the one associated with the newly
- received OPEN message), and continues to use the
- existing one (the one that is already in the
- OpenConfirm state). */
- if (new->fd >= 0)
- bgp_notify_send (peer, BGP_NOTIFY_CEASE, BGP_NOTIFY_CEASE_CONNECT_COLLISION);
- return -1;
- }
- }
- }
- return 0;
- }
- int
- bgp_open_receive (struct peer *peer, bgp_size_t size)
- {
- int ret;
- u_char version;
- u_char optlen;
- u_int16_t holdtime;
- u_int16_t send_holdtime;
- as_t remote_as;
- struct peer *realpeer;
- struct in_addr remote_id;
- int capability;
- char notify_data_remote_as[2];
- char notify_data_remote_id[4];
- realpeer = NULL;
-
- /* Parse open packet. */
- version = stream_getc (peer->ibuf);
- memcpy (notify_data_remote_as, stream_pnt (peer->ibuf), 2);
- remote_as = stream_getw (peer->ibuf);
- holdtime = stream_getw (peer->ibuf);
- memcpy (notify_data_remote_id, stream_pnt (peer->ibuf), 4);
- remote_id.s_addr = stream_get_ipv4 (peer->ibuf);
- /* Receive OPEN message log */
- if (BGP_DEBUG (normal, NORMAL))
- zlog_info ("%s rcv OPEN, version %d, remote-as %d, holdtime %d, id %s",
- peer->host, version, remote_as, holdtime,
- inet_ntoa (remote_id));
-
- /* Lookup peer from Open packet. */
- if (CHECK_FLAG (peer->sflags, PEER_STATUS_ACCEPT_PEER))
- {
- int as = 0;
- realpeer = peer_lookup_with_open (&peer->su, remote_as, &remote_id, &as);
- if (! realpeer)
- {
- /* Peer's source IP address is check in bgp_accept(), so this
- must be AS number mismatch or remote-id configuration
- mismatch. */
- if (as)
- {
- if (BGP_DEBUG (normal, NORMAL))
- zlog_info ("%s bad OPEN, wrong router identifier %s",
- peer->host, inet_ntoa (remote_id));
- bgp_notify_send_with_data (peer,
- BGP_NOTIFY_OPEN_ERR,
- BGP_NOTIFY_OPEN_BAD_BGP_IDENT,
- notify_data_remote_id, 4);
- }
- else
- {
- if (BGP_DEBUG (normal, NORMAL))
- zlog_info ("%s bad OPEN, remote AS is %d, expected %d",
- peer->host, remote_as, peer->as);
- bgp_notify_send_with_data (peer,
- BGP_NOTIFY_OPEN_ERR,
- BGP_NOTIFY_OPEN_BAD_PEER_AS,
- notify_data_remote_as, 2);
- }
- return -1;
- }
- }
- /* When collision is detected and this peer is closed. Retrun
- immidiately. */
- ret = bgp_collision_detect (peer, remote_id);
- if (ret < 0)
- return ret;
- /* Hack part. */
- if (CHECK_FLAG (peer->sflags, PEER_STATUS_ACCEPT_PEER))
- {
- if (CHECK_FLAG (realpeer->flags, PEER_FLAG_CONNECT_MODE_ACTIVE))
- {
- if (BGP_DEBUG (normal, NORMAL))
- zlog_info ("%s passive open failed - TCP session must be opened actively",
- realpeer->host);
- bgp_notify_send (peer, BGP_NOTIFY_CEASE, BGP_NOTIFY_CEASE_CONNECT_REJECT);
- return -1;
- }
- if (realpeer->status == Established
- && CHECK_FLAG (realpeer->sflags, PEER_STATUS_NSF_MODE))
- {
- realpeer->last_reset = PEER_DOWN_NSF_CLOSE_SESSION;
- SET_FLAG (realpeer->sflags, PEER_STATUS_NSF_WAIT);
- }
- else if (ret == 0 && realpeer->status != Active
- && realpeer->status != OpenSent
- && realpeer->status != OpenConfirm)
- {
- if (BGP_DEBUG (events, EVENTS))
- zlog_info ("%s peer status is %s close connection",
- realpeer->host, LOOKUP (bgp_status_msg, realpeer->status));
- bgp_notify_send (peer, BGP_NOTIFY_CEASE, BGP_NOTIFY_CEASE_CONNECT_REJECT);
- return -1;
- }
- if (BGP_DEBUG (events, EVENTS))
- zlog_info ("%s [Event] Transfer temporary BGP peer to existing one",
- peer->host);
- bgp_stop (realpeer);
-
- /* Transfer file descriptor. */
- realpeer->fd = peer->fd;
- peer->fd = -1;
- /* Transfer input buffer. */
- stream_free (realpeer->ibuf);
- realpeer->ibuf = peer->ibuf;
- realpeer->packet_size = peer->packet_size;
- peer->ibuf = NULL;
- /* Transfer status. */
- bgp_fsm_change_status (realpeer, peer->status);
- bgp_stop (peer);
- /* peer pointer change. Open packet send to neighbor. */
- peer = realpeer;
- bgp_open_send (peer);
- if (peer->fd < 0)
- {
- zlog_err ("bgp_open_receive peer's fd is negative value %d",
- peer->fd);
- return -1;
- }
- BGP_READ_ON (peer->t_read, bgp_read, peer->fd);
- }
- /* remote router-id check. */
- if (remote_id.s_addr == 0
- || ntohl (remote_id.s_addr) >= 0xe0000000
- || ntohl (peer->local_id.s_addr) == ntohl (remote_id.s_addr))
- {
- if (BGP_DEBUG (normal, NORMAL))
- zlog_info ("%s bad OPEN, wrong router identifier %s",
- peer->host, inet_ntoa (remote_id));
- bgp_notify_send_with_data (peer,
- BGP_NOTIFY_OPEN_ERR,
- BGP_NOTIFY_OPEN_BAD_BGP_IDENT,
- notify_data_remote_id, 4);
- return -1;
- }
- /* Set remote router-id */
- peer->remote_id = remote_id;
- /* Peer BGP version check. */
- if (version != BGP_VERSION_4)
- {
- if (BGP_DEBUG (normal, NORMAL))
- zlog_info ("%s bad protocol version, remote requested %d, local request %d",
- peer->host, version, BGP_VERSION_4);
- bgp_notify_send_with_data (peer,
- BGP_NOTIFY_OPEN_ERR,
- BGP_NOTIFY_OPEN_UNSUP_VERSION,
- "x04", 1);
- return -1;
- }
- /* Check neighbor as number. */
- if (remote_as != peer->as)
- {
- if (BGP_DEBUG (normal, NORMAL))
- zlog_info ("%s bad OPEN, remote AS is %d, expected %d",
- peer->host, remote_as, peer->as);
- bgp_notify_send_with_data (peer,
- BGP_NOTIFY_OPEN_ERR,
- BGP_NOTIFY_OPEN_BAD_PEER_AS,
- notify_data_remote_as, 2);
- return -1;
- }
- /* From the rfc: Upon receipt of an OPEN message, a BGP speaker MUST
- calculate the value of the Hold Timer by using the smaller of its
- configured Hold Time and the Hold Time received in the OPEN message.
- The Hold Time MUST be either zero or at least three seconds. An
- implementation may reject connections on the basis of the Hold Time. */
- if (holdtime < 3 && holdtime != 0)
- {
- bgp_notify_send (peer,
- BGP_NOTIFY_OPEN_ERR,
- BGP_NOTIFY_OPEN_UNACEP_HOLDTIME);
- return -1;
- }
-
- /* From the rfc: A reasonable maximum time between KEEPALIVE messages
- would be one third of the Hold Time interval. KEEPALIVE messages
- MUST NOT be sent more frequently than one per second. An
- implementation MAY adjust the rate at which it sends KEEPALIVE
- messages as a function of the Hold Time interval. */
- if (CHECK_FLAG (peer->config, PEER_CONFIG_TIMER))
- send_holdtime = peer->holdtime;
- else
- send_holdtime = peer->bgp->default_holdtime;
- if (holdtime < send_holdtime)
- peer->v_holdtime = holdtime;
- else
- peer->v_holdtime = send_holdtime;
- peer->v_keepalive = peer->v_holdtime / 3;
- /* Open option part parse. */
- capability = 0;
- optlen = stream_getc (peer->ibuf);
- if (optlen != 0)
- {
- ret = bgp_open_option_parse (peer, optlen, &capability);
- if (ret < 0)
- return ret;
- stream_forward (peer->ibuf, optlen);
- }
- else
- {
- if (BGP_DEBUG (normal, NORMAL))
- zlog_info ("%s rcvd OPEN w/ OPTION parameter len: 0",
- peer->host);
- }
- /* Override capability. */
- if (! capability || CHECK_FLAG (peer->flags, PEER_FLAG_OVERRIDE_CAPABILITY))
- {
- peer->afc_nego[AFI_IP][SAFI_UNICAST] = peer->afc[AFI_IP][SAFI_UNICAST];
- peer->afc_nego[AFI_IP][SAFI_MULTICAST] = peer->afc[AFI_IP][SAFI_MULTICAST];
- peer->afc_nego[AFI_IP6][SAFI_UNICAST] = peer->afc[AFI_IP6][SAFI_UNICAST];
- peer->afc_nego[AFI_IP6][SAFI_MULTICAST] = peer->afc[AFI_IP6][SAFI_MULTICAST];
- }
- /* Get sockname. */
- bgp_getsockname (peer);
- BGP_EVENT_ADD (peer, Receive_OPEN_message);
- peer->packet_size = 0;
- if (peer->ibuf)
- stream_reset (peer->ibuf);
- return 0;
- }
- /* Parse BGP Update packet and make attribute object. */
- int
- bgp_update_receive (struct peer *peer, bgp_size_t size)
- {
- int ret;
- u_char *end;
- struct stream *s;
- struct attr attr;
- bgp_size_t attribute_len;
- bgp_size_t update_len;
- bgp_size_t withdraw_len;
- struct bgp_nlri update;
- struct bgp_nlri withdraw;
- struct bgp_nlri mp_update;
- struct bgp_nlri mp_withdraw;
- char attrstr[BUFSIZ] = "";
- /* Status must be Established. */
- if (peer->status != Established)
- {
- zlog_err ("%s [FSM] Update packet received under status %s",
- peer->host, LOOKUP (bgp_status_msg, peer->status));
- bgp_notify_send (peer, BGP_NOTIFY_FSM_ERR, 0);
- return -1;
- }
- /* Set initial values. */
- memset (&attr, 0, sizeof (struct attr));
- memset (&update, 0, sizeof (struct bgp_nlri));
- memset (&withdraw, 0, sizeof (struct bgp_nlri));
- memset (&mp_update, 0, sizeof (struct bgp_nlri));
- memset (&mp_withdraw, 0, sizeof (struct bgp_nlri));
- s = peer->ibuf;
- end = stream_pnt (s) + size;
- /* RFC1771 6.3 If the Unfeasible Routes Length or Total Attribute
- Length is too large (i.e., if Unfeasible Routes Length + Total
- Attribute Length + 23 exceeds the message Length), then the Error
- Subcode is set to Malformed Attribute List. */
- if (stream_pnt (s) + 2 > end)
- {
- zlog_err ("%s [Error] Update packet error"
- " (packet length is short for unfeasible length)",
- peer->host);
- bgp_notify_send (peer, BGP_NOTIFY_UPDATE_ERR,
- BGP_NOTIFY_UPDATE_MAL_ATTR);
- return -1;
- }
- /* Unfeasible Route Length. */
- withdraw_len = stream_getw (s);
- /* Unfeasible Route Length check. */
- if (stream_pnt (s) + withdraw_len > end)
- {
- zlog_err ("%s [Error] Update packet error"
- " (packet unfeasible length overflow %d)",
- peer->host, withdraw_len);
- bgp_notify_send (peer, BGP_NOTIFY_UPDATE_ERR,
- BGP_NOTIFY_UPDATE_MAL_ATTR);
- return -1;
- }
- /* Unfeasible Route packet format check. */
- if (withdraw_len > 0)
- {
- ret = bgp_nlri_sanity_check (peer, AFI_IP, stream_pnt (s), withdraw_len);
- if (ret < 0)
- return -1;
- if (BGP_DEBUG (packet, PACKET_RECV))
- zlog_info ("%s [Update:RECV] Unfeasible NLRI received", peer->host);
- withdraw.afi = AFI_IP;
- withdraw.safi = SAFI_UNICAST;
- withdraw.nlri = stream_pnt (s);
- withdraw.length = withdraw_len;
- stream_forward (s, withdraw_len);
- }
-
- /* Attribute total length check. */
- if (stream_pnt (s) + 2 > end)
- {
- zlog_warn ("%s [Error] Packet Error"
- " (update packet is short for attribute length)",
- peer->host);
- bgp_notify_send (peer, BGP_NOTIFY_UPDATE_ERR,
- BGP_NOTIFY_UPDATE_MAL_ATTR);
- return -1;
- }
- /* Fetch attribute total length. */
- attribute_len = stream_getw (s);
- /* Attribute length check. */
- if (stream_pnt (s) + attribute_len > end)
- {
- zlog_warn ("%s [Error] Packet Error"
- " (update packet attribute length overflow %d)",
- peer->host, attribute_len);
- bgp_notify_send (peer, BGP_NOTIFY_UPDATE_ERR,
- BGP_NOTIFY_UPDATE_MAL_ATTR);
- return -1;
- }
- /* Parse attribute when it exists. */
- if (attribute_len)
- {
- ret = bgp_attr_parse (peer, &attr, attribute_len,
- &mp_update, &mp_withdraw);
- if (ret < 0)
- return -1;
- }
- /* Logging the attribute. */
- if (BGP_DEBUG (update, UPDATE_IN))
- {
- ret= bgp_dump_attr (peer, &attr, attrstr, BUFSIZ);
- if (ret)
- zlog (peer->log, LOG_INFO, "%s rcvd UPDATE w/ attr: %s",
- peer->host, attrstr);
- }
- /* Network Layer Reachability Information. */
- update_len = end - stream_pnt (s);
- if (update_len)
- {
- /* Check NLRI packet format and prefix length. */
- ret = bgp_nlri_sanity_check (peer, AFI_IP, stream_pnt (s), update_len);
- if (ret < 0)
- return -1;
- /* Set NLRI portion to structure. */
- update.afi = AFI_IP;
- update.safi = SAFI_UNICAST;
- update.nlri = stream_pnt (s);
- update.length = update_len;
- stream_forward (s, update_len);
- }
- /* NLRI is processed only when the peer is configured specific
- Address Family and Subsequent Address Family. */
- if (peer->afc[AFI_IP][SAFI_UNICAST])
- {
- if (withdraw.length)
- bgp_nlri_parse (peer, NULL, &withdraw);
- if (update.length)
- {
- /* We check well-known attribute only for IPv4 unicast
- update. */
- ret = bgp_attr_check (peer, &attr);
- if (ret < 0)
- return -1;
- bgp_nlri_parse (peer, &attr, &update);
- }
- if (mp_update.length
- && mp_update.afi == AFI_IP
- && mp_update.safi == SAFI_UNICAST)
- bgp_nlri_parse (peer, &attr, &mp_update);
- if (mp_withdraw.length
- && mp_withdraw.afi == AFI_IP
- && mp_withdraw.safi == SAFI_UNICAST)
- bgp_nlri_parse (peer, NULL, &mp_withdraw);
- if (! attribute_len && ! withdraw_len)
- {
- /* End-of-RIB received */
- SET_FLAG (peer->af_sflags[AFI_IP][SAFI_UNICAST], PEER_STATUS_EOR_RECEIVED);
- if (BGP_DEBUG (normal, NORMAL))
- zlog_info ("neighbor %s sent End-of-RIB marker for IPv4 Unicast",
- peer->host);
- /* NSF delete stale route */
- if (peer->nsf[AFI_IP][SAFI_UNICAST])
- bgp_clear_stale_route (peer, AFI_IP, SAFI_UNICAST);
- }
- }
- if (peer->afc[AFI_IP][SAFI_MULTICAST])
- {
- if (mp_update.length
- && mp_update.afi == AFI_IP
- && mp_update.safi == SAFI_MULTICAST)
- bgp_nlri_parse (peer, &attr, &mp_update);
- if (mp_withdraw.length
- && mp_withdraw.afi == AFI_IP
- && mp_withdraw.safi == SAFI_MULTICAST)
- bgp_nlri_parse (peer, NULL, &mp_withdraw);
- if (! withdraw_len
- && mp_withdraw.afi == AFI_IP
- && mp_withdraw.safi == SAFI_MULTICAST
- && mp_withdraw.length == 0)
- {
- /* End-of-RIB received */
- SET_FLAG (peer->af_sflags[AFI_IP][SAFI_MULTICAST], PEER_STATUS_EOR_RECEIVED);
- if (BGP_DEBUG (normal, NORMAL))
- zlog_info ("neighbor %s sent End-of-RIB marker for IPv4 Multicast",
- peer->host);
- /* NSF delete stale route */
- if (peer->nsf[AFI_IP][SAFI_MULTICAST])
- bgp_clear_stale_route (peer, AFI_IP, SAFI_MULTICAST);
- }
- }
- if (peer->afc[AFI_IP6][SAFI_UNICAST])
- {
- if (mp_update.length
- && mp_update.afi == AFI_IP6
- && mp_update.safi == SAFI_UNICAST)
- bgp_nlri_parse (peer, &attr, &mp_update);
- if (mp_withdraw.length
- && mp_withdraw.afi == AFI_IP6
- && mp_withdraw.safi == SAFI_UNICAST)
- bgp_nlri_parse (peer, NULL, &mp_withdraw);
- if (! withdraw_len
- && mp_withdraw.afi == AFI_IP6
- && mp_withdraw.safi == SAFI_UNICAST
- && mp_withdraw.length == 0)
- {
- /* End-of-RIB received */
- SET_FLAG (peer->af_sflags[AFI_IP6][SAFI_UNICAST], PEER_STATUS_EOR_RECEIVED);
- if (BGP_DEBUG (normal, NORMAL))
- zlog_info ("neighbor %s sent End-of-RIB marker for IPv6 Unicast",
- peer->host);
- /* NSF delete stale route */
- if (peer->nsf[AFI_IP6][SAFI_UNICAST])
- bgp_clear_stale_route (peer, AFI_IP6, SAFI_UNICAST);
- }
- }
- if (peer->afc[AFI_IP6][SAFI_MULTICAST])
- {
- if (mp_update.length
- && mp_update.afi == AFI_IP6
- && mp_update.safi == SAFI_MULTICAST)
- bgp_nlri_parse (peer, &attr, &mp_update);
- if (mp_withdraw.length
- && mp_withdraw.afi == AFI_IP6
- && mp_withdraw.safi == SAFI_MULTICAST)
- bgp_nlri_parse (peer, NULL, &mp_withdraw);
- if (! withdraw_len
- && mp_withdraw.afi == AFI_IP6
- && mp_withdraw.safi == SAFI_MULTICAST
- && mp_withdraw.length == 0)
- {
- /* End-of-RIB received */
- SET_FLAG (peer->af_sflags[AFI_IP6][SAFI_MULTICAST], PEER_STATUS_EOR_RECEIVED);
- if (BGP_DEBUG (normal, NORMAL))
- zlog_info ("neighbor %s sent End-of-RIB marker for IPv6 Multicast",
- peer->host);
- /* NSF delete stale route */
- if (peer->nsf[AFI_IP6][SAFI_MULTICAST])
- bgp_clear_stale_route (peer, AFI_IP6, SAFI_MULTICAST);
- }
- }
- if (peer->afc[AFI_IP][SAFI_MPLS_VPN])
- {
- if (mp_update.length
- && mp_update.afi == AFI_IP
- && mp_update.safi == BGP_SAFI_VPNV4)
- bgp_nlri_parse_vpnv4 (peer, &attr, &mp_update);
- if (mp_withdraw.length
- && mp_withdraw.afi == AFI_IP
- && mp_withdraw.safi == BGP_SAFI_VPNV4)
- bgp_nlri_parse_vpnv4 (peer, NULL, &mp_withdraw);
- if (! withdraw_len
- && mp_withdraw.afi == AFI_IP
- && mp_withdraw.safi == BGP_SAFI_VPNV4
- && mp_withdraw.length == 0)
- {
- /* End-of-RIB received */
- if (BGP_DEBUG (normal, NORMAL))
- zlog_info ("neighbor %s sent End-of-RIB marker for VPNv4 Unicast",
- peer->host);
- }
- }
- /* Everything is done. We unintern temporary structures which
- interned in bgp_attr_parse(). */
- if (attr.aspath)
- aspath_unintern (attr.aspath);
- if (attr.community)
- community_unintern (attr.community);
- if (attr.ecommunity)
- ecommunity_unintern (attr.ecommunity);
- if (attr.cluster)
- cluster_unintern (attr.cluster);
- if (attr.transit)
- transit_unintern (attr.transit);
- /* If peering is stopped due to some reason, do not generate BGP
- event. */
- if (peer->status != Established)
- return 0;
- /* Increment packet counter. */
- peer->update_in++;
- peer->update_time = time (NULL);
- /* Generate BGP event. */
- BGP_EVENT_ADD (peer, Receive_UPDATE_message);
- return 0;
- }
- /* Notify message treatment function. */
- void
- bgp_notify_receive (struct peer *peer, bgp_size_t size)
- {
- struct bgp_notify bgp_notify;
- if (peer->notify.data)
- {
- XFREE (MTYPE_TMP, peer->notify.data);
- peer->notify.data = NULL;
- peer->notify.length = 0;
- }
- bgp_notify.code = stream_getc (peer->ibuf);
- bgp_notify.subcode = stream_getc (peer->ibuf);
- bgp_notify.length = size - 2;
- bgp_notify.data = NULL;
- /* Preserv notify code and sub code. */
- peer->notify.code = bgp_notify.code;
- peer->notify.subcode = bgp_notify.subcode;
- /* For further diagnostic record returned Data. */
- if (bgp_notify.length)
- {
- peer->notify.length = size - 2;
- peer->notify.data = XMALLOC (MTYPE_TMP, size - 2);
- memcpy (peer->notify.data, stream_pnt (peer->ibuf), size - 2);
- }
- /* For debug */
- {
- int i;
- int first = 0;
- char c[4];
- if (bgp_notify.length)
- {
- bgp_notify.data = XMALLOC (MTYPE_TMP, bgp_notify.length * 3);
- for (i = 0; i < bgp_notify.length; i++)
- if (first)
- {
- sprintf (c, " %02x", stream_getc (peer->ibuf));
- strcat (bgp_notify.data, c);
- }
- else
- {
- first = 1;
- sprintf (c, "%02x", stream_getc (peer->ibuf));
- strcpy (bgp_notify.data, c);
- }
- }
- bgp_notify_print(peer, &bgp_notify, "received");
- if (bgp_notify.data)
- XFREE (MTYPE_TMP, bgp_notify.data);
- }
- /* peer count update */
- peer->notify_in++;
- if (peer->status == Established)
- peer->last_reset = PEER_DOWN_NOTIFY_RECEIVED;
- /* We have to check for Notify with Unsupported Optional Parameter.
- in that case we fallback to open without the capability option.
- But this done in bgp_stop. We just mark it here to avoid changing
- the fsm tables. */
- if (bgp_notify.code == BGP_NOTIFY_OPEN_ERR &&
- bgp_notify.subcode == BGP_NOTIFY_OPEN_UNSUP_PARAM )
- UNSET_FLAG (peer->sflags, PEER_STATUS_CAPABILITY_OPEN);
- /* Also apply to Unsupported Capability until remote router support
- capability. */
- if (bgp_notify.code == BGP_NOTIFY_OPEN_ERR &&
- bgp_notify.subcode == BGP_NOTIFY_OPEN_UNSUP_CAPBL)
- UNSET_FLAG (peer->sflags, PEER_STATUS_CAPABILITY_OPEN);
- BGP_EVENT_ADD (peer, Receive_NOTIFICATION_message);
- }
- /* Keepalive treatment function -- get keepalive send keepalive */
- void
- bgp_keepalive_receive (struct peer *peer, bgp_size_t size)
- {
- if (BGP_DEBUG (keepalive, KEEPALIVE))
- zlog_info ("%s received KEEPALIVE, length (excl. header) %d", peer->host, size);
-
- BGP_EVENT_ADD (peer, Receive_KEEPALIVE_message);
- }
- /* Route refresh message is received. */
- void
- bgp_route_refresh_receive (struct peer *peer, bgp_size_t size)
- {
- afi_t afi;
- safi_t safi;
- u_char reserved;
- struct stream *s;
- /* If peer does not have the capability, send notification. */
- if (! CHECK_FLAG (peer->cap, PEER_CAP_REFRESH_ADV))
- {
- plog_err (peer->log, "%s [Error] BGP route refresh is not enabled",
- peer->host);
- bgp_notify_send (peer,
- BGP_NOTIFY_HEADER_ERR,
- BGP_NOTIFY_HEADER_BAD_MESTYPE);
- return;
- }
- /* Status must be Established. */
- if (peer->status != Established)
- {
- plog_err (peer->log,
- "%s [Error] Route refresh packet received under status %s",
- peer->host, LOOKUP (bgp_status_msg, peer->status));
- bgp_notify_send (peer, BGP_NOTIFY_FSM_ERR, 0);
- return;
- }
- s = peer->ibuf;
-
- /* Parse packet. */
- afi = stream_getw (s);
- reserved = stream_getc (s);
- safi = stream_getc (s);
- if (BGP_DEBUG (normal, NORMAL))
- zlog_info ("%s rcvd REFRESH_REQ for afi/safi: %d/%d",
- peer->host, afi, safi);
- /* Check AFI and SAFI. */
- if ((afi != AFI_IP && afi != AFI_IP6)
- || (safi != SAFI_UNICAST && safi != SAFI_MULTICAST
- && safi != BGP_SAFI_VPNV4))
- {
- if (BGP_DEBUG (normal, NORMAL))
- {
- zlog_info ("%s REFRESH_REQ for unrecognized afi/safi: %d/%d - ignored",
- peer->host, afi, safi);
- }
- return;
- }
- /* Adjust safi code. */
- if (safi == BGP_SAFI_VPNV4)
- safi = SAFI_MPLS_VPN;
- if (size != BGP_MSG_ROUTE_REFRESH_MIN_SIZE - BGP_HEADER_SIZE)
- {
- u_char *end;
- u_char when_to_refresh;
- u_char orf_type;
- u_int16_t orf_len;
- if (size - (BGP_MSG_ROUTE_REFRESH_MIN_SIZE - BGP_HEADER_SIZE) < 5)
- {
- zlog_info ("%s ORF route refresh length error", peer->host);
- bgp_notify_send (peer, BGP_NOTIFY_CEASE, 0);
- return;
- }
- when_to_refresh = stream_getc (s);
- end = stream_pnt (s) + (size - 5);
- while (stream_pnt (s) < end)
- {
- orf_type = stream_getc (s);
- orf_len = stream_getw (s);
- if (orf_type == ORF_TYPE_PREFIX
- || orf_type == ORF_TYPE_PREFIX_OLD)
- {
- u_char *p_pnt = stream_pnt (s);
- u_char *p_end = stream_pnt (s) + orf_len;
- struct orf_prefix orfp;
- u_char common = 0;
- u_int32_t seq;
- int psize;
- char name[BUFSIZ];
- char buf[BUFSIZ];
- int ret;
- if (BGP_DEBUG (normal, NORMAL))
- {
- zlog_info ("%s rcvd Prefixlist ORF(%d) length %d",
- peer->host, orf_type, orf_len);
- }
- /* ORF prefix-list name */
- sprintf (name, "%s.%d.%d", peer->host, afi, safi);
- while (p_pnt < p_end)
- {
- memset (&orfp, 0, sizeof (struct orf_prefix));
- common = *p_pnt++;
- if (common & ORF_COMMON_PART_REMOVE_ALL)
- {
- if (BGP_DEBUG (normal, NORMAL))
- zlog_info ("%s rcvd Remove-All pfxlist ORF request", peer->host);
- prefix_bgp_orf_remove_all (name);
- break;
- }
- memcpy (&seq, p_pnt, sizeof (u_int32_t));
- p_pnt += sizeof (u_int32_t);
- orfp.seq = ntohl (seq);
- orfp.ge = *p_pnt++;
- orfp.le = *p_pnt++;
- orfp.p.prefixlen = *p_pnt++;
- orfp.p.family = afi2family (afi);
- psize = PSIZE (orfp.p.prefixlen);
- memcpy (&orfp.p.u.prefix, p_pnt, psize);
- p_pnt += psize;
- if (BGP_DEBUG (normal, NORMAL))
- zlog_info ("%s rcvd %s %s seq %u %s/%d ge %d le %d",
- peer->host,
- (common & ORF_COMMON_PART_REMOVE ? "Remove" : "Add"),
- (common & ORF_COMMON_PART_DENY ? "deny" : "permit"),
- orfp.seq,
- inet_ntop (orfp.p.family, &orfp.p.u.prefix, buf, BUFSIZ),
- orfp.p.prefixlen, orfp.ge, orfp.le);
- ret = prefix_bgp_orf_set (name, afi, &orfp,
- (common & ORF_COMMON_PART_DENY ? 0 : 1 ),
- (common & ORF_COMMON_PART_REMOVE ? 0 : 1));
- if (ret != CMD_SUCCESS)
- {
- if (BGP_DEBUG (normal, NORMAL))
- zlog_info ("%s Received misformatted prefixlist ORF. Remove All pfxlist", peer->host);
- prefix_bgp_orf_remove_all (name);
- break;
- }
- }
- peer->orf_plist[afi][safi] =
- prefix_list_lookup (AFI_ORF_PREFIX, name);
- }
- stream_forward (s, orf_len);
- }
- if (BGP_DEBUG (normal, NORMAL))
- zlog_info ("%s rcvd Refresh %s ORF request", peer->host,
- when_to_refresh == REFRESH_DEFER ? "Defer" : "Immediate");
- if (when_to_refresh == REFRESH_DEFER)
- return;
- }
- /* First update is deferred until ORF or ROUTE-REFRESH is received */
- if (CHECK_FLAG (peer->af_sflags[afi][safi], PEER_STATUS_ORF_WAIT_REFRESH))
- UNSET_FLAG (peer->af_sflags[afi][safi], PEER_STATUS_ORF_WAIT_REFRESH);
- /* Perform route refreshment to the peer */
- bgp_announce_route (peer, afi, safi);
- }
- int
- bgp_capability_msg_parse (struct peer *peer, u_char *pnt, bgp_size_t length)
- {
- u_char *end;
- struct capability cap;
- u_char action;
- struct bgp *bgp;
- afi_t afi;
- safi_t safi;
- bgp = peer->bgp;
- end = pnt + length;
- while (pnt < end)
- {
- /* We need at least action, capability code and capability length. */
- if (pnt + 3 > end)
- {
- zlog_info ("%s Capability length error", peer->host);
- bgp_notify_send (peer, BGP_NOTIFY_CEASE, 0);
- return -1;
- }
- action = *pnt;
- /* Fetch structure to the byte stream. */
- memcpy (&cap, pnt + 1, sizeof (struct capability));
- /* Action value check. */
- if (action != CAPABILITY_ACTION_SET
- && action != CAPABILITY_ACTION_UNSET)
- {
- zlog_info ("%s Capability Action Value error %d",
- peer->host, action);
- bgp_notify_send (peer, BGP_NOTIFY_CEASE, 0);
- return -1;
- }
- if (BGP_DEBUG (normal, NORMAL))
- zlog_info ("%s CAPABILITY has action: %d, code: %u, length %u",
- peer->host, action, cap.code, cap.length);
- /* Capability length check. */
- if (pnt + (cap.length + 3) > end)
- {
- zlog_info ("%s Capability length error", peer->host);
- bgp_notify_send (peer, BGP_NOTIFY_CEASE, 0);
- return -1;
- }
- /* We know MP Capability Code. */
- if (cap.code == CAPABILITY_CODE_MP)
- {
- afi = ntohs (cap.mpc.afi);
- safi = cap.mpc.safi;
- /* Ignore capability when override-capability is set. */
- if (CHECK_FLAG (peer->flags, PEER_FLAG_OVERRIDE_CAPABILITY))
- continue;
- /* Address family check. */
- if ((afi == AFI_IP
- || afi == AFI_IP6)
- && (safi == SAFI_UNICAST
- || safi == SAFI_MULTICAST
- || safi == BGP_SAFI_VPNV4))
- {
- if (BGP_DEBUG (normal, NORMAL))
- zlog_info ("%s CAPABILITY has %s MP_EXT CAP for afi/safi: %u/%u",
- peer->host,
- action == CAPABILITY_ACTION_SET
- ? "Advertising" : "Removing",
- ntohs(cap.mpc.afi) , cap.mpc.safi);
-
- /* Adjust safi code. */
- if (safi == BGP_SAFI_VPNV4)
- safi = SAFI_MPLS_VPN;
-
- if (action == CAPABILITY_ACTION_SET)
- {
- peer->afc_recv[afi][safi] = 1;
- if (peer->afc[afi][safi])
- {
- peer->afc_nego[afi][safi] = 1;
- bgp_announce_route (peer, afi, safi);
- }
- }
- else
- {
- peer->afc_recv[afi][safi] = 0;
- peer->afc_nego[afi][safi] = 0;
- if (peer_active_nego (peer))
- {
- bgp_clear_route (peer, afi, safi);
- peer->synctime[afi][safi] = 0;
- BGP_TIMER_OFF (peer->t_routeadv[afi][safi]);
- peer->af_sflags[afi][safi] = 0;
- }
- else
- BGP_EVENT_ADD (peer, BGP_Stop);
- }
- }
- }
- else
- {
- zlog_warn ("%s unrecognized capability code: %d - ignored",
- peer->host, cap.code);
- }
- pnt += cap.length + 3;
- }
- return 0;
- }
- /* Dynamic Capability is received. */
- void
- bgp_capability_receive (struct peer *peer, bgp_size_t size)
- {
- u_char *pnt;
- int ret;
- /* Fetch pointer. */
- pnt = stream_pnt (peer->ibuf);
- if (BGP_DEBUG (normal, NORMAL))
- zlog_info ("%s rcv CAPABILITY", peer->host);
- /* If peer does not have the capability, send notification. */
- if (! CHECK_FLAG (peer->cap, PEER_CAP_DYNAMIC_ADV))
- {
- plog_err (peer->log, "%s [Error] BGP dynamic capability is not enabled",
- peer->host);
- bgp_notify_send (peer,
- BGP_NOTIFY_HEADER_ERR,
- BGP_NOTIFY_HEADER_BAD_MESTYPE);
- return;
- }
- /* Status must be Established. */
- if (peer->status != Established)
- {
- plog_err (peer->log,
- "%s [Error] Dynamic capability packet received under status %s", peer->host, LOOKUP (bgp_status_msg, peer->status));
- bgp_notify_send (peer, BGP_NOTIFY_FSM_ERR, 0);
- return;
- }
- /* Parse packet. */
- ret = bgp_capability_msg_parse (peer, pnt, size);
- }
- /* BGP read utility function. */
- int
- bgp_read_packet (struct peer *peer)
- {
- int nbytes;
- int readsize;
- readsize = peer->packet_size - peer->ibuf->putp;
- /* If size is zero then return. */
- if (! readsize)
- return 0;
- /* Read packet from fd. */
- nbytes = stream_read_unblock (peer->ibuf, peer->fd, readsize);
- /* If read byte is smaller than zero then error occured. */
- if (nbytes < 0)
- {
- if (errno == EAGAIN)
- return -1;
- plog_err (peer->log, "%s [Error] bgp_read_packet error: %s",
- peer->host, strerror (errno));
- if (peer->status == Established)
- {
- if (CHECK_FLAG (peer->sflags, PEER_STATUS_NSF_MODE))
- {
- peer->last_reset = PEER_DOWN_NSF_CLOSE_SESSION;
- SET_FLAG (peer->sflags, PEER_STATUS_NSF_WAIT);
- }
- else
- peer->last_reset = PEER_DOWN_CLOSE_SESSION;
- }
- BGP_EVENT_ADD (peer, TCP_fatal_error);
- return -1;
- }
- /* When read byte is zero : clear bgp peer and return */
- if (nbytes == 0)
- {
- if (BGP_DEBUG (events, EVENTS))
- plog_info (peer->log, "%s [Event] BGP connection closed fd %d",
- peer->host, peer->fd);
- if (peer->status == Established)
- {
- if (CHECK_FLAG (peer->sflags, PEER_STATUS_NSF_MODE))
- {
- peer->last_reset = PEER_DOWN_NSF_CLOSE_SESSION;
- SET_FLAG (peer->sflags, PEER_STATUS_NSF_WAIT);
- }
- else
- peer->last_reset = PEER_DOWN_CLOSE_SESSION;
- }
- BGP_EVENT_ADD (peer, TCP_connection_closed);
- return -1;
- }
- /* We read partial packet. */
- if (peer->ibuf->putp != peer->packet_size)
- return -1;
- return 0;
- }
- /* Marker check. */
- int
- bgp_marker_all_one (struct stream *s, int length)
- {
- int i;
- for (i = 0; i < length; i++)
- if (s->data[i] != 0xff)
- return 0;
- return 1;
- }
- /* Starting point of packet process function. */
- int
- bgp_read (struct thread *thread)
- {
- int ret;
- u_char type = 0;
- struct peer *peer;
- bgp_size_t size;
- char notify_data_length[2];
- /* Yes first of all get peer pointer. */
- peer = THREAD_ARG (thread);
- peer->t_read = NULL;
- /* For non-blocking IO check. */
- if (peer->status == Connect)
- {
- bgp_connect_check (peer);
- goto done;
- }
- else
- {
- if (peer->fd < 0)
- {
- zlog_err ("bgp_read peer's fd is negative value %d", peer->fd);
- return -1;
- }
- BGP_READ_ON (peer->t_read, bgp_read, peer->fd);
- }
- /* Read packet header to determine type of the packet */
- if (peer->packet_size == 0)
- peer->packet_size = BGP_HEADER_SIZE;
- if (peer->ibuf->putp < BGP_HEADER_SIZE)
- {
- ret = bgp_read_packet (peer);
- /* Header read error or partial read packet. */
- if (ret < 0)
- goto done;
- /* Get size and type. */
- stream_forward (peer->ibuf, BGP_MARKER_SIZE);
- memcpy (notify_data_length, stream_pnt (peer->ibuf), 2);
- size = stream_getw (peer->ibuf);
- type = stream_getc (peer->ibuf);
- if (BGP_DEBUG (normal, NORMAL))
- if (type && type != BGP_MSG_UPDATE && type != BGP_MSG_KEEPALIVE)
- zlog_info ("%s rcv message type %d, length (excl. header) %d",
- peer->host, type, size - BGP_HEADER_SIZE);
- /* Marker check */
- if (type == BGP_MSG_OPEN
- && ! bgp_marker_all_one (peer->ibuf, BGP_MARKER_SIZE))
- {
- bgp_notify_send (peer,
- BGP_NOTIFY_HEADER_ERR,
- BGP_NOTIFY_HEADER_NOT_SYNC);
- goto done;
- }
- /* BGP type check. */
- if (type != BGP_MSG_OPEN && type != BGP_MSG_UPDATE
- && type != BGP_MSG_NOTIFY && type != BGP_MSG_KEEPALIVE
- && type != BGP_MSG_ROUTE_REFRESH_NEW
- && type != BGP_MSG_ROUTE_REFRESH_OLD
- && type != BGP_MSG_CAPABILITY)
- {
- if (BGP_DEBUG (normal, NORMAL))
- plog_err (peer->log,
- "%s unknown message type 0x%02x",
- peer->host, type);
- bgp_notify_send_with_data (peer,
- BGP_NOTIFY_HEADER_ERR,
- BGP_NOTIFY_HEADER_BAD_MESTYPE,
- &type, 1);
- goto done;
- }
- /* Mimimum packet length check. */
- if ((size < BGP_HEADER_SIZE)
- || (size > BGP_MAX_PACKET_SIZE)
- || (type == BGP_MSG_OPEN && size < BGP_MSG_OPEN_MIN_SIZE)
- || (type == BGP_MSG_UPDATE && size < BGP_MSG_UPDATE_MIN_SIZE)
- || (type == BGP_MSG_NOTIFY && size < BGP_MSG_NOTIFY_MIN_SIZE)
- || (type == BGP_MSG_KEEPALIVE && size != BGP_MSG_KEEPALIVE_MIN_SIZE)
- || (type == BGP_MSG_ROUTE_REFRESH_NEW && size < BGP_MSG_ROUTE_REFRESH_MIN_SIZE)
- || (type == BGP_MSG_ROUTE_REFRESH_OLD && size < BGP_MSG_ROUTE_REFRESH_MIN_SIZE)
- || (type == BGP_MSG_CAPABILITY && size < BGP_MSG_CAPABILITY_MIN_SIZE))
- {
- if (BGP_DEBUG (normal, NORMAL))
- plog_err (peer->log,
- "%s bad message length - %d for %s",
- peer->host, size,
- type == 128 ? "ROUTE-REFRESH" :
- bgp_type_str[(int) type]);
- bgp_notify_send_with_data (peer,
- BGP_NOTIFY_HEADER_ERR,
- BGP_NOTIFY_HEADER_BAD_MESLEN,
- notify_data_length, 2);
- goto done;
- }
- /* Adjust size to message length. */
- peer->packet_size = size;
- }
- ret = bgp_read_packet (peer);
- if (ret < 0)
- goto done;
- /* Get size and type again. */
- size = stream_getw_from (peer->ibuf, BGP_MARKER_SIZE);
- type = stream_getc_from (peer->ibuf, BGP_MARKER_SIZE + 2);
- /* BGP packet dump function. */
- bgp_dump_packet (peer, type, peer->ibuf);
-
- size = (peer->packet_size - BGP_HEADER_SIZE);
- /* Read rest of the packet and call each sort of packet routine */
- switch (type)
- {
- case BGP_MSG_OPEN:
- peer->open_in++;
- bgp_open_receive (peer, size);
- break;
- case BGP_MSG_UPDATE:
- peer->readtime = time(NULL); /* Last read timer reset */
- bgp_update_receive (peer, size);
- break;
- case BGP_MSG_NOTIFY:
- bgp_notify_receive (peer, size);
- break;
- case BGP_MSG_KEEPALIVE:
- peer->readtime = time(NULL); /* Last read timer reset */
- bgp_keepalive_receive (peer, size);
- break;
- case BGP_MSG_ROUTE_REFRESH_NEW:
- case BGP_MSG_ROUTE_REFRESH_OLD:
- peer->refresh_in++;
- bgp_route_refresh_receive (peer, size);
- break;
- case BGP_MSG_CAPABILITY:
- peer->dynamic_cap_in++;
- bgp_capability_receive (peer, size);
- break;
- }
- /* Clear input buffer. */
- peer->packet_size = 0;
- if (peer->ibuf)
- stream_reset (peer->ibuf);
- done:
- if (CHECK_FLAG (peer->sflags, PEER_STATUS_ACCEPT_PEER))
- {
- if (BGP_DEBUG (events, EVENTS))
- zlog_info ("%s [Event] Accepting BGP peer delete", peer->host);
- peer_delete (peer);
- }
- return 0;
- }