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| author | Vlad Yasevich <vladislav.yasevich@hp.com> | 2007-06-07 13:47:03 -0400 |
|---|---|---|
| committer | Vladislav Yasevich <vxy@hera.kernel.org> | 2007-06-13 20:44:42 +0000 |
| commit | c910b47e1811b3f8b184108c48de3d7af3e2999b (patch) | |
| tree | 76ca90239b074a13137217d3732f79fe83a2500b | |
| parent | fe979ac169970b3d12facd6565766735862395c5 (diff) | |
| download | linux-c910b47e1811b3f8b184108c48de3d7af3e2999b.tar.gz linux-c910b47e1811b3f8b184108c48de3d7af3e2999b.tar.bz2 linux-c910b47e1811b3f8b184108c48de3d7af3e2999b.zip | |
[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>
| -rw-r--r-- | include/net/sctp/structs.h | 1 | ||||
| -rw-r--r-- | net/sctp/input.c | 16 | ||||
| -rw-r--r-- | net/sctp/transport.c | 41 |
3 files changed, 44 insertions, 14 deletions
diff --git a/include/net/sctp/structs.h b/include/net/sctp/structs.h index 5e81984b8478..dc0e70cb0f8b 100644 --- a/include/net/sctp/structs.h +++ b/include/net/sctp/structs.h @@ -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 diff --git a/net/sctp/input.c b/net/sctp/input.c index 885109fb3dda..45d6a644cf06 100644 --- a/net/sctp/input.c +++ b/net/sctp/input.c @@ -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); diff --git a/net/sctp/transport.c b/net/sctp/transport.c index 961df275d5b9..e14c271cf28b 100644 --- a/net/sctp/transport.c +++ b/net/sctp/transport.c @@ -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. */ |