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Fix a bug where the wrong protocol overhead was used. This can lead

Browse Source 
to a deadlock of an association when an IPv6 socket was used to
communcate with IPv4 and an ICMPv4 fragmentation needed message
was received.
While there, simplify the code a bit.

MFC after: 3 days.
This commit is contained in:
Michael Tuexen 2012-02-14 12:00:34 +00:00
parent 0662ee9826
commit 9b1246ca38
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=231672
1 changed files with 63 additions and 26 deletions
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89
sys/netinet/sctp_output.c
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@ -7612,16 +7612,22 @@ sctp_fill_outqueue(struct sctp_tcb *stcb,
SCTP_TCB_LOCK_ASSERT(stcb);
asoc = &stcb->asoc;
#ifdef INET6
if (net->ro._l_addr.sin6.sin6_family == AF_INET6) {
goal_mtu = net->mtu - SCTP_MIN_OVERHEAD;
} else {
/* ?? not sure what else to do */
switch (net->ro._l_addr.sa.sa_family) {
#ifdef INET
case AF_INET:
goal_mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
}
#else
goal_mtu = net->mtu - SCTP_MIN_OVERHEAD;
break;
#endif
#ifdef INET6
case AF_INET6:
goal_mtu = net->mtu - SCTP_MIN_OVERHEAD;
break;
#endif
default:
/* TSNH */
goal_mtu = net->mtu;
break;
}
/* Need an allowance for the data chunk header too */
goal_mtu -= sizeof(struct sctp_data_chunk);
@ -8180,10 +8186,21 @@ sctp_med_chunk_output(struct sctp_inpcb *inp,
if (!no_out_cnt)
*num_out += ctl_cnt;
/* recalc a clean slate and setup */
if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
mtu = (net->mtu - SCTP_MIN_OVERHEAD);
} else {
mtu = (net->mtu - SCTP_MIN_V4_OVERHEAD);
switch (net->ro._l_addr.sa.sa_family) {
#ifdef INET
case AF_INET:
mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
break;
#endif
#ifdef INET6
case AF_INET6:
mtu = net->mtu - SCTP_MIN_OVERHEAD;
break;
#endif
default:
/* TSNH */
mtu = net->mtu;
break;
}
to_out = 0;
no_fragmentflg = 1;
@ -8446,10 +8463,21 @@ sctp_med_chunk_output(struct sctp_inpcb *inp,
if (!no_out_cnt)
*num_out += ctl_cnt;
/* recalc a clean slate and setup */
if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
mtu = (net->mtu - SCTP_MIN_OVERHEAD);
} else {
mtu = (net->mtu - SCTP_MIN_V4_OVERHEAD);
switch (net->ro._l_addr.sa.sa_family) {
#ifdef INET
case AF_INET:
mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
break;
#endif
#ifdef INET6
case AF_INET6:
mtu = net->mtu - SCTP_MIN_OVERHEAD;
break;
#endif
default:
/* TSNH */
mtu = net->mtu;
break;
}
to_out = 0;
no_fragmentflg = 1;
@ -9492,10 +9520,21 @@ sctp_chunk_retransmission(struct sctp_inpcb *inp,
}
/* pick up the net */
net = chk->whoTo;
if (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_BOUND_V6) {
mtu = (net->mtu - SCTP_MIN_OVERHEAD);
} else {
switch (net->ro._l_addr.sa.sa_family) {
#ifdef INET
case AF_INET:
mtu = net->mtu - SCTP_MIN_V4_OVERHEAD;
break;
#endif
#ifdef INET6
case AF_INET6:
mtu = net->mtu - SCTP_MIN_OVERHEAD;
break;
#endif
default:
/* TSNH */
mtu = net->mtu;
break;
}
if ((asoc->peers_rwnd < mtu) && (asoc->total_flight > 0)) {
@ -9816,12 +9855,10 @@ sctp_chunk_retransmission(struct sctp_inpcb *inp,
return (0);
}
static int
static void
sctp_timer_validation(struct sctp_inpcb *inp,
struct sctp_tcb *stcb,
struct sctp_association *asoc,
int ret)
struct sctp_association *asoc)
{
struct sctp_nets *net;
@ -9829,7 +9866,7 @@ sctp_timer_validation(struct sctp_inpcb *inp,
TAILQ_FOREACH(net, &asoc->nets, sctp_next) {
if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) {
/* Here is a timer */
return (ret);
return;
}
}
SCTP_TCB_LOCK_ASSERT(stcb);
@ -9840,7 +9877,7 @@ sctp_timer_validation(struct sctp_inpcb *inp,
} else {
sctp_timer_start(SCTP_TIMER_TYPE_SEND, inp, stcb, asoc->primary_destination);
}
return (ret);
return;
}
void
@ -9950,7 +9987,7 @@ sctp_chunk_output(struct sctp_inpcb *inp,
#ifdef SCTP_AUDITING_ENABLED
sctp_auditing(8, inp, stcb, NULL);
#endif
(void)sctp_timer_validation(inp, stcb, asoc, ret);
sctp_timer_validation(inp, stcb, asoc);
return;
}
if (ret < 0) {