From 65957886bfd0dd9d95360d8b015781fc82cc09be Mon Sep 17 00:00:00 2001
From: Stephen Hemminger <shemminger@vyatta.com>
Date: Fri, 15 Jan 2010 16:22:10 +0300
Subject: bgp: use monotonic clock for time of day

BGP uses time() to get system time of day; but that value
fluctuates with time adjustments from NTP. This can cause premature
flapping of peer sessions and other failures.

Use the system monotonic clock supported by Quagga thread library
to avoid issue.

See: http://bugzilla.vyatta.com/show_bug.cgi?id=4467

* bgpd/bgp_fsm.c
  * bgp_uptime_reset(): dismiss function
* bgpd/bgpd.c
  * bgp_clock(): new function
* bgpd/bgp_damp.c
  * bgp_reuse_timer(): employ bgp_clock() instead of time(NULL)
  * bgp_damp_withdraw(): idem
  * bgp_damp_update(): idem
  * bgp_damp_scan(): idem
  * bgp_damp_info_vty(): idem
  * bgp_damp_reuse_time_vty(): idem
* bgpd/bgp_fsm.c
  * bgp_routeadv_timer(): idem
  * bgp_stop(): idem
  * bgp_establish(): idem
* bgpd/bgp_packet.c
  * bgp_update_receive(): idem
* bgpd/bgp_route.c
  * bgp_update_rsclient(): idem
  * bgp_update_main(): idem
  * bgp_static_update_rsclient(): idem
  * bgp_static_update_main(): idem
  * bgp_static_update_vpnv4(): idem
  * bgp_aggregate_route(): idem
  * bgp_aggregate_add(): idem
  * bgp_redistribute_add(): idem
* bgpd/bgp_snmp.c
  * bgpPeerTable(): idem
  * bgpTrapEstablished(): idem
  * bgpTrapBackwardTransition(): idem
* bgpd/bgpd.c
  * peer_create(): idem
  * peer_uptime(): idem
  * bgp_master_init(): idem
---
 bgpd/bgp_fsm.c | 18 +++---------------
 1 file changed, 3 insertions(+), 15 deletions(-)

(limited to 'bgpd/bgp_fsm.c')

diff --git a/bgpd/bgp_fsm.c b/bgpd/bgp_fsm.c
index c815f9a1..487ebddb 100644
--- a/bgpd/bgp_fsm.c
+++ b/bgpd/bgp_fsm.c
@@ -305,7 +305,7 @@ bgp_routeadv_timer (struct thread *thread)
 	  "%s [FSM] Timer (routeadv timer expire)",
 	  peer->host);
 
-  peer->synctime = time (NULL);
+  peer->synctime = bgp_clock ();
 
   BGP_WRITE_ON (peer->t_write, bgp_write, peer->fd);
 
@@ -315,13 +315,6 @@ bgp_routeadv_timer (struct thread *thread)
   return 0;
 }
 
-/* Reset bgp update timer */
-static void
-bgp_uptime_reset (struct peer *peer)
-{
-  peer->uptime = time (NULL);
-}
-
 /* BGP Peer Down Cause */
 const char *peer_down_str[] =
 {
@@ -493,17 +486,12 @@ bgp_stop (struct peer *peer)
 	}
 
       /* set last reset time */
-      peer->resettime = time (NULL);
-      /* Reset uptime. */
-      bgp_uptime_reset (peer);
+      peer->resettime = peer->uptime = bgp_clock ();
 
 #ifdef HAVE_SNMP
       bgpTrapBackwardTransition (peer);
 #endif /* HAVE_SNMP */
 
-      /* Reset uptime. */
-      bgp_uptime_reset (peer);
-
       /* Reset peer synctime */
       peer->synctime = 0;
     }
@@ -857,7 +845,7 @@ bgp_establish (struct peer *peer)
 #endif /* HAVE_SNMP */
 
   /* Reset uptime, send keepalive, send current table. */
-  bgp_uptime_reset (peer);
+  peer->uptime = bgp_clock ();
 
   /* Send route-refresh when ORF is enabled */
   for (afi = AFI_IP ; afi < AFI_MAX ; afi++)
-- 
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