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channels/chan_iax2: Improve POKE expiration time calculation for lossy networks

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POKE is used to check for peer availability; however, in networks with packet
loss, the current calculations may result in POKE expiration times that are too
short. This patch alters the expiration/retry time logic to take into account
the last known qualify round trip time, as opposed to always using a static
value for each peer.

Review: https://reviewboard.asterisk.org/r/4536

ASTERISK-22352 #close
Reported by: Frederic Van Espen

ASTERISK-24894 #close
Reported by: Y Ateya
patches:
  poke_noanswer_duration.diff submitted by Y Ateya (License 6693)
........

Merged revisions 434564 from http://svn.asterisk.org/svn/asterisk/branches/11


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/13@434565 65c4cc65-6c06-0410-ace0-fbb531ad65f3
This commit is contained in:
Matthew Jordan
2015-04-10 12:39:48 +00:00
parent 75c2c85962
commit c39faa4729
1 changed files with 19 additions and 6 deletions
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25
channels/chan_iax2.c
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@@ -12318,6 +12318,7 @@ static int iax2_poke_peer_cb(void *obj, void *arg, int flags)
static int iax2_poke_peer(struct iax2_peer *peer, int heldcall)
{
int callno;
int poke_timeout;
if (!peer->maxms || (ast_sockaddr_isnull(&peer->addr) && !peer->dnsmgr)) {
/* IF we have no IP without dnsmgr, or this isn't to be monitored, return
@@ -12353,12 +12354,24 @@ static int iax2_poke_peer(struct iax2_peer *peer, int heldcall)
}
}
if (peer->lastms < 0){
/* If the host is already unreachable then use time less than the unreachable
* interval. 5/6 is arbitrary multiplier to get value less than
* peer->pokefreqnotok. Value less than peer->pokefreqnotok is used to expire
* current POKE before starting new POKE (which is scheduled after
* peer->pokefreqnotok). */
poke_timeout = peer->pokefreqnotok * 5 / 6;
} else {
/* If the host is reachable, use timeout large enough to allow for multiple
* POKE retries. Limit this value to less than peer->pokefreqok. 5/6 is arbitrary
* multiplier to get value less than peer->pokefreqok. Value less than
* peer->pokefreqok is used to expire current POKE before starting new POKE
* (which is scheduled after peer->pokefreqok). */
poke_timeout = MIN(MAX_RETRY_TIME * 2 + peer->maxms, peer->pokefreqok * 5 / 6);
}
/* Queue up a new task to handle no reply */
/* If the host is already unreachable then use the unreachable interval instead */
if (peer->lastms < 0)
peer->pokeexpire = iax2_sched_add(sched, peer->pokefreqnotok, iax2_poke_noanswer, peer_ref(peer));
else
peer->pokeexpire = iax2_sched_add(sched, DEFAULT_MAXMS * 2, iax2_poke_noanswer, peer_ref(peer));
peer->pokeexpire = iax2_sched_add(sched, poke_timeout, iax2_poke_noanswer, peer_ref(peer));
if (peer->pokeexpire == -1)
peer_unref(peer);
@@ -12372,7 +12385,7 @@ static int iax2_poke_peer(struct iax2_peer *peer, int heldcall)
};
/* Speed up retransmission times for this qualify call */
iaxs[callno]->pingtime = peer->maxms / 4 + 1;
iaxs[callno]->pingtime = peer->maxms / 8;
iaxs[callno]->peerpoke = peer;
add_empty_calltoken_ie(iaxs[callno], &ied); /* this _MUST_ be the last ie added */