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In tcp timers, check INP_DROPPED flag a little later, after

Browse Source 
callout_deactivate(), so if INP_DROPPED is set we return with the
timer active flag cleared.

For me this fixes negative keep timer values reported by `netstat -x'
for connections in CLOSE state.

Approved by:	net (silence)
MFC after:	2 weeks
This commit is contained in:
Mikolaj Golub 2012-08-05 17:30:17 +00:00
parent b0c39ce916
commit 655f934b78
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=239075
1 changed files with 38 additions and 9 deletions
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47
sys/netinet/tcp_timer.c
View File

@ -183,13 +183,18 @@ tcp_timer_delack(void *xtp)
return;
}
INP_WLOCK(inp);
if ((inp->inp_flags & INP_DROPPED) || callout_pending(&tp->t_timers->tt_delack)
|| !callout_active(&tp->t_timers->tt_delack)) {
if (callout_pending(&tp->t_timers->tt_delack) ||
!callout_active(&tp->t_timers->tt_delack)) {
INP_WUNLOCK(inp);
CURVNET_RESTORE();
return;
}
callout_deactivate(&tp->t_timers->tt_delack);
if ((inp->inp_flags & INP_DROPPED) != 0) {
INP_WUNLOCK(inp);
CURVNET_RESTORE();
return;
}
tp->t_flags |= TF_ACKNOW;
TCPSTAT_INC(tcps_delack);
@ -229,7 +234,7 @@ tcp_timer_2msl(void *xtp)
}
INP_WLOCK(inp);
tcp_free_sackholes(tp);
if ((inp->inp_flags & INP_DROPPED) || callout_pending(&tp->t_timers->tt_2msl) ||
if (callout_pending(&tp->t_timers->tt_2msl) ||
!callout_active(&tp->t_timers->tt_2msl)) {
INP_WUNLOCK(tp->t_inpcb);
INP_INFO_WUNLOCK(&V_tcbinfo);
@ -237,6 +242,12 @@ tcp_timer_2msl(void *xtp)
return;
}
callout_deactivate(&tp->t_timers->tt_2msl);
if ((inp->inp_flags & INP_DROPPED) != 0) {
INP_WUNLOCK(inp);
INP_INFO_WUNLOCK(&V_tcbinfo);
CURVNET_RESTORE();
return;
}
/*
* 2 MSL timeout in shutdown went off. If we're closed but
* still waiting for peer to close and connection has been idle
@ -300,14 +311,20 @@ tcp_timer_keep(void *xtp)
return;
}
INP_WLOCK(inp);
if ((inp->inp_flags & INP_DROPPED) || callout_pending(&tp->t_timers->tt_keep)
|| !callout_active(&tp->t_timers->tt_keep)) {
if (callout_pending(&tp->t_timers->tt_keep) ||
!callout_active(&tp->t_timers->tt_keep)) {
INP_WUNLOCK(inp);
INP_INFO_WUNLOCK(&V_tcbinfo);
CURVNET_RESTORE();
return;
}
callout_deactivate(&tp->t_timers->tt_keep);
if ((inp->inp_flags & INP_DROPPED) != 0) {
INP_WUNLOCK(inp);
INP_INFO_WUNLOCK(&V_tcbinfo);
CURVNET_RESTORE();
return;
}
/*
* Keep-alive timer went off; send something
* or drop connection if idle for too long.
@ -397,14 +414,20 @@ tcp_timer_persist(void *xtp)
return;
}
INP_WLOCK(inp);
if ((inp->inp_flags & INP_DROPPED) || callout_pending(&tp->t_timers->tt_persist)
|| !callout_active(&tp->t_timers->tt_persist)) {
if (callout_pending(&tp->t_timers->tt_persist) ||
!callout_active(&tp->t_timers->tt_persist)) {
INP_WUNLOCK(inp);
INP_INFO_WUNLOCK(&V_tcbinfo);
CURVNET_RESTORE();
return;
}
callout_deactivate(&tp->t_timers->tt_persist);
if ((inp->inp_flags & INP_DROPPED) != 0) {
INP_WUNLOCK(inp);
INP_INFO_WUNLOCK(&V_tcbinfo);
CURVNET_RESTORE();
return;
}
/*
* Persistance timer into zero window.
* Force a byte to be output, if possible.
@ -469,14 +492,20 @@ tcp_timer_rexmt(void * xtp)
return;
}
INP_WLOCK(inp);
if ((inp->inp_flags & INP_DROPPED) || callout_pending(&tp->t_timers->tt_rexmt)
|| !callout_active(&tp->t_timers->tt_rexmt)) {
if (callout_pending(&tp->t_timers->tt_rexmt) ||
!callout_active(&tp->t_timers->tt_rexmt)) {
INP_WUNLOCK(inp);
INP_INFO_RUNLOCK(&V_tcbinfo);
CURVNET_RESTORE();
return;
}
callout_deactivate(&tp->t_timers->tt_rexmt);
if ((inp->inp_flags & INP_DROPPED) != 0) {
INP_WUNLOCK(inp);
INP_INFO_RUNLOCK(&V_tcbinfo);
CURVNET_RESTORE();
return;
}
tcp_free_sackholes(tp);
/*
* Retransmission timer went off. Message has not