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authorXin Long <lucien.xin@gmail.com>2020-10-29 10:05:04 +0300
committerJakub Kicinski <kuba@kernel.org>2020-10-31 01:24:21 +0300
commitf1bfe8b5415171b5e70c2a47d399c91bd7c2752e (patch)
tree0f4916867d8f9041b025c4d8e804232de9b23b1a /net/sctp
parenta1dd2cf2f1aedabc2ca9bb4f90231a521c52d8eb (diff)
downloadlinux-f1bfe8b5415171b5e70c2a47d399c91bd7c2752e.tar.xz
sctp: add udphdr to overhead when udp_port is set
sctp_mtu_payload() is for calculating the frag size before making chunks from a msg. So we should only add udphdr size to overhead when udp socks are listening, as only then sctp can handle the incoming sctp over udp packets and outgoing sctp over udp packets will be possible. Note that we can't do this according to transport->encap_port, as different transports may be set to different values, while the chunks were made before choosing the transport, we could not be able to meet all rfc6951#section-5.6 recommends. v1->v2: - Add udp_port for sctp_sock to avoid a potential race issue, it will be used in xmit path in the next patch. Signed-off-by: Xin Long <lucien.xin@gmail.com> Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'net/sctp')
-rw-r--r--net/sctp/socket.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index 2a9ee9b3e46c..a710917c5ac7 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -4928,6 +4928,7 @@ static int sctp_init_sock(struct sock *sk)
* be modified via SCTP_PEER_ADDR_PARAMS
*/
sp->hbinterval = net->sctp.hb_interval;
+ sp->udp_port = htons(net->sctp.udp_port);
sp->encap_port = htons(net->sctp.encap_port);
sp->pathmaxrxt = net->sctp.max_retrans_path;
sp->pf_retrans = net->sctp.pf_retrans;