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[SCTP] Update pmtu handling to be similar to tcp 

Introduce new function sctp_transport_update_pmtu that updates
the transports and destination caches view of the path mtu.

Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com>
Acked-by: Sridhar Samudrala <sri@us.ibm.com>
This commit is contained in:
Vlad Yasevich 2007-06-07 13:47:03 -04:00 committed by Vladislav Yasevich
parent fe979ac169
commit c910b47e18
3 changed files with 44 additions and 14 deletions
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1
include/net/sctp/structs.h
View File

@ -1006,6 +1006,7 @@ void sctp_transport_raise_cwnd(struct sctp_transport *, __u32, __u32);
void sctp_transport_lower_cwnd(struct sctp_transport *, sctp_lower_cwnd_t);
unsigned long sctp_transport_timeout(struct sctp_transport *);
void sctp_transport_reset(struct sctp_transport *);
void sctp_transport_update_pmtu(struct sctp_transport *, u32);
/* This is the structure we use to queue packets as they come into

16
net/sctp/input.c
View File

@ -371,20 +371,8 @@ void sctp_icmp_frag_needed(struct sock *sk, struct sctp_association *asoc,
return;
if (t->param_flags & SPP_PMTUD_ENABLE) {
if (unlikely(pmtu < SCTP_DEFAULT_MINSEGMENT)) {
printk(KERN_WARNING "%s: Reported pmtu %d too low, "
"using default minimum of %d\n",
__FUNCTION__, pmtu,
SCTP_DEFAULT_MINSEGMENT);
/* Use default minimum segment size and disable
* pmtu discovery on this transport.
*/
t->pathmtu = SCTP_DEFAULT_MINSEGMENT;
t->param_flags = (t->param_flags & ~SPP_PMTUD) |
SPP_PMTUD_DISABLE;
} else {
t->pathmtu = pmtu;
}
/* Update transports view of the MTU */
sctp_transport_update_pmtu(t, pmtu);
/* Update association pmtu. */
sctp_assoc_sync_pmtu(asoc);

41
net/sctp/transport.c
View File

@ -241,6 +241,47 @@ void sctp_transport_pmtu(struct sctp_transport *transport)
transport->pathmtu = SCTP_DEFAULT_MAXSEGMENT;
}
/* this is a complete rip-off from __sk_dst_check
* the cookie is always 0 since this is how it's used in the
* pmtu code
*/
static struct dst_entry *sctp_transport_dst_check(struct sctp_transport *t)
{
struct dst_entry *dst = t->dst;
if (dst && dst->obsolete && dst->ops->check(dst, 0) == NULL) {
dst_release(t->dst);
t->dst = NULL;
return NULL;
}
return dst;
}
void sctp_transport_update_pmtu(struct sctp_transport *t, u32 pmtu)
{
struct dst_entry *dst;
if (unlikely(pmtu < SCTP_DEFAULT_MINSEGMENT)) {
printk(KERN_WARNING "%s: Reported pmtu %d too low, "
"using default minimum of %d\n",
__FUNCTION__, pmtu,
SCTP_DEFAULT_MINSEGMENT);
/* Use default minimum segment size and disable
* pmtu discovery on this transport.
*/
t->pathmtu = SCTP_DEFAULT_MINSEGMENT;
t->param_flags = (t->param_flags & ~SPP_PMTUD) |
SPP_PMTUD_DISABLE;
} else {
t->pathmtu = pmtu;
}
dst = sctp_transport_dst_check(t);
if (dst)
dst->ops->update_pmtu(dst, pmtu);
}
/* Caches the dst entry and source address for a transport's destination
* address.
*/