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| author | Xin Long <lucien.xin@gmail.com> | 2021-10-28 12:36:03 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-11-18 21:16:43 +0300 |
| commit | 554153b1cd01203fc462f814749b37fe081121a8 (patch) | |
| tree | 8dc8da6228278a37ac843a659f72f91d69195a02 /net | |
| parent | 118eedc0064456f9560af73d77852d802f8c4c3d (diff) | |
| download | linux-554153b1cd01203fc462f814749b37fe081121a8.tar.xz | |
sctp: subtract sctphdr len in sctp_transport_pl_hlen
[ Upstream commit cc4665ca646c96181a7c00198aa72c59e0c576e8 ]
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: d9e2e410ae30 ("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>
Diffstat (limited to 'net')
0 files changed, 0 insertions, 0 deletions