Author: tuexen
Date: Thu May 16 08:40:10 2019
New Revision: 347655
URL: https://svnweb.freebsd.org/changeset/base/347655
Log:
MFC r343770:
Only reduce the PMTU after the send call. The only way to increase it, is
via PMTUD.
This fixes an MTU issue reported by Timo Voelker.
Modified:
stable/11/sys/netinet/sctp_output.c
Directory Properties:
stable/11/ (props changed)
Modified: stable/11/sys/netinet/sctp_output.c
==============================================================================
--- stable/11/sys/netinet/sctp_output.c Thu May 16 08:38:20 2019
(r347654)
+++ stable/11/sys/netinet/sctp_output.c Thu May 16 08:40:10 2019
(r347655)
@@ -4283,10 +4283,12 @@ sctp_lowlevel_chunk_output(struct sctp_inpcb *inp,
if (net->port) {
mtu -= sizeof(struct
udphdr);
}
- if ((stcb != NULL) &&
(stcb->asoc.smallest_mtu > mtu)) {
-
sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
+ if (mtu < net->mtu) {
+ if ((stcb != NULL) &&
(stcb->asoc.smallest_mtu > mtu)) {
+
sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
+ }
+ net->mtu = mtu;
}
- net->mtu = mtu;
}
} else if (ro->ro_rt == NULL) {
/* route was freed */
@@ -4640,10 +4642,12 @@ sctp_lowlevel_chunk_output(struct sctp_inpcb *inp,
if (net->port) {
mtu -= sizeof(struct
udphdr);
}
- if ((stcb != NULL) &&
(stcb->asoc.smallest_mtu > mtu)) {
-
sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
+ if (mtu < net->mtu) {
+ if ((stcb != NULL) &&
(stcb->asoc.smallest_mtu > mtu)) {
+
sctp_mtu_size_reset(inp, &stcb->asoc, mtu);
+ }
+ net->mtu = mtu;
}
- net->mtu = mtu;
}
} else if (ifp) {
if (ND_IFINFO(ifp)->linkmtu &&
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