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[ Upstream commitcc4665ca64] 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>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.