Author: tuexen
Date: Tue Jan 31 23:36:31 2017
New Revision: 313031
URL: https://svnweb.freebsd.org/changeset/base/313031
Log:
Take the SCTP common header into account when computing the
space available for chunks. This unbreaks the handling of
ICMPV6 packets indicating "packet too big". It just worked
for IPv4 since we are overbooking for IPv4.
MFC after: 1 week
Modified:
head/sys/netinet/sctp_usrreq.c
Modified: head/sys/netinet/sctp_usrreq.c
==============================================================================
--- head/sys/netinet/sctp_usrreq.c Tue Jan 31 23:34:02 2017
(r313030)
+++ head/sys/netinet/sctp_usrreq.c Tue Jan 31 23:36:31 2017
(r313031)
@@ -108,7 +108,7 @@ sctp_pathmtu_adjustment(struct sctp_tcb
/* Adjust that too */
stcb->asoc.smallest_mtu = nxtsz;
/* now off to subtract IP_DF flag if needed */
- overhead = IP_HDR_SIZE;
+ overhead = IP_HDR_SIZE + sizeof(struct sctphdr);
if (sctp_auth_is_required_chunk(SCTP_DATA,
stcb->asoc.peer_auth_chunks)) {
overhead += sctp_get_auth_chunk_len(stcb->asoc.peer_hmac_id);
}
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