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Take the SCTP common header into account when computing the

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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
This commit is contained in:
Michael Tuexen 2017-01-31 23:36:31 +00:00
parent 7858d7cb8e
commit 2aa116007c
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=313031
1 changed files with 1 additions and 1 deletions
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2
sys/netinet/sctp_usrreq.c
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@ -108,7 +108,7 @@ sctp_pathmtu_adjustment(struct sctp_tcb *stcb, uint16_t nxtsz)
/* 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);
}