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How does sctp identify which association will receive the data

+3 votes

Suppose I have a socket which contain several associations in it. that means there are several clients connect with server.

If I use sendmsg(...) function to send msg from server, How does sctp identify which association will receive the data? Does all clients will receive the msg?

And, Does sctp provide a way for server to send msg to all associations in one syscall ?

posted Aug 15, 2013 by Naveena Garg

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2 Answers

+1 vote

The receiving association is specified in either the msg_name field of the message header or the association id field of the sndrcv_info cmsg header in the datagram. IIRC there is no was to send to all associations at once in a single syscall, unless you want to marshall up all the data and pass it down via the sendmmsg syscall, which I don't think lksctp-tools supports yet (though that would be a nice feature).

answer Aug 15, 2013 by Abhay Kulkarni
+1 vote

You can use the deprecated cmsg SCTP_SNDRCV and specify the association id.
I'm not sure if Linux supports the newer cmsg SCTP_SNDINFO yet.

answer Aug 15, 2013 by Jagan Mishra
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