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bgpd: honor max prefix timer on inbound sessions

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When using the maximum-prefix restart option with a BGP peer,
if the peer exceeds the limit of prefixes, bgpd causes the
connection to be closed and sets a timer. It will not attempt
to connect to that peer until the timer expires. But if the
peer attempts to connect to it before the timer expires, it
accepts the connection and starts exchanging routes again.

When accepting a connection from a peer, reject the connection
if the max prefix restart timer is set.

Signed-off-by: Matthew Smith <mgsmith@netgate.com>
This commit is contained in:
Matthew Smith 2019-07-09 12:59:44 -05:00
parent f85d5e3d97
commit 497b686a49
1 changed files with 11 additions and 0 deletions
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11
bgpd/bgp_network.c
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@ -440,6 +440,17 @@ static int bgp_accept(struct thread *thread)
return -1; return -1;
} }
/* Check whether max prefix restart timer is set for the peer */
if (peer1->t_pmax_restart) {
if (bgp_debug_neighbor_events(peer1))
zlog_debug(
"%s - incoming conn rejected - "
"peer max prefix timer is active",
peer1->host);
close(bgp_sock);
return -1;
}
if (bgp_debug_neighbor_events(peer1)) if (bgp_debug_neighbor_events(peer1))
zlog_debug("[Event] BGP connection from host %s fd %d", zlog_debug("[Event] BGP connection from host %s fd %d",
inet_sutop(&su, buf), bgp_sock); inet_sutop(&su, buf), bgp_sock);