sctp: add SCTP_REMOTE_UDP_ENCAPS_PORT sockopt
This patch is to implement: rfc6951#section-6.1: Get or Set the Remote UDP Encapsulation Port Number with the param of the struct: struct sctp_udpencaps { sctp_assoc_t sue_assoc_id; struct sockaddr_storage sue_address; uint16_t sue_port; }; the encap_port of sock, assoc or transport can be changed by users, which also means it allows the different transports of the same asoc to have different encap_port value. v1->v2: - no change. v2->v3: - fix the endian warning when setting values between encap_port and sue_port. 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>
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