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Xin Long 554153b1cd sctp: subtract sctphdr len in sctp_transport_pl_hlen

[ Upstream commit cc4665ca64 ]

sctp_transport_pl_hlen() is called to calculate the outer header length
for PL. However, as the Figure in rfc8899#section-4.4:

   Any additional
     headers         .--- MPS -----.
            |        |             |
            v        v             v
     +------------------------------+
     | IP | ** | PL | protocol data |
     +------------------------------+

                <----- PLPMTU ----->
     <---------- PMTU -------------->

Outer header are IP + Any additional headers, which doesn't include
Packetization Layer itself header, namely sctphdr, whereas sctphdr
is counted by __sctp_mtu_payload().

The incorrect calculation caused the link pathmtu to be set larger
than expected by t->pl.pmtu + sctp_transport_pl_hlen(). This patch
is to fix it by subtracting sctphdr len in sctp_transport_pl_hlen().

Fixes: d9e2e410ae ("sctp: add the constants/variables and states and some APIs for transport")
Signed-off-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>

2021-11-18 19:16:43 +01:00

auth.h

sctp: add sctp_auth_init and sctp_auth_free

2019-08-19 18:27:29 -07:00

checksum.h

Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net

2019-05-31 10:49:43 -07:00

command.h

sctp: add the probe timer in transport for PLPMTUD

2021-06-22 11:28:52 -07:00

constants.h

sctp: move 198 addresses from unusable to private scope