redonkable
/
alistair23-linux
1
0
Fork 0
Code Releases Activity

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>
zero-sugar-mainline-defconfig
Xin Long 2020-10-29 15:05:04 +08:00 committed by Jakub Kicinski
parent a1dd2cf2f1
commit f1bfe8b541
3 changed files with 7 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
include/net/sctp/sctp.h
View File

@ -578,10 +578,13 @@ static inline __u32 sctp_mtu_payload(const struct sctp_sock *sp,
{
__u32 overhead = sizeof(struct sctphdr) + extra;
if (sp)
if (sp) {
overhead += sp->pf->af->net_header_len;
else
if (sp->udp_port)
overhead += sizeof(struct udphdr);
} else {
overhead += sizeof(struct ipv6hdr);
}
if (WARN_ON_ONCE(mtu && mtu <= overhead))
mtu = overhead;

1
include/net/sctp/structs.h
View File

@ -178,6 +178,7 @@ struct sctp_sock {
*/
__u32 hbinterval;
__be16 udp_port;
__be16 encap_port;
/* This is the max_retrans value for new associations. */

1
net/sctp/socket.c
View File

@ -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;