sctp: add support for PR-SCTP Information for sendmsg
This patch is to add support for PR-SCTP Information for sendmsg, as described in section 5.3.7 of RFC6458. With this option, you can specify pr_policy and pr_value for user data in sendmsg. It's also a necessary send info for sctp_sendv. Signed-off-by: Xin Long <lucien.xin@gmail.com> Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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