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Multi-homing in SCTP of OpenSolaris10

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Operating Systems Solaris Multi-homing in SCTP of OpenSolaris10
# 1  
Old 02-02-2009
Bug Multi-homing in SCTP of OpenSolaris10
Hi,

I met a problem about multi-homing in SCTP of opensolaris10 system.

There is a server and a client communicating with SCTP socket (One-To-One style).

For the server, I bind two IP addresses (with different subclass) to the its socket .

For the client, two IP addresses are binded to client's socket, corresponding to server's addresses. Only one of them is used to be as the server address in connect() function since there is no API sctp_connectx() in solaris10.

I have no idea how can the multi-homing feature be used on solaris10?

I used SCTP_ASSOCINFO option to get a struct sctp_assocparams and its member sasoc_number_peer_destinations is 1.

The addresses returned from sctp_getladdrs() and sctp_getpaddrs() are the pairs used for connect().

I tried to trigger multi-homing feature by using SCTP_PRIMARY_ADDR option to change the primary address on client. But it seems that this option is not supported by solairs10. (both setsockopt() and sctp_opt_info())

For my comprehension, I think the two endpoints will negotiate the IP address set used for communication during initialization of association, even only one address is used for connection. After initialization, multi-addresses can be used.

I'm confused about this.

Could you please give me some comments?

Thanks a lot.
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LEARN ABOUT SUNOS

sctp_peeloff

sctp_peeloff(3SOCKET)					     Sockets Library Functions					     sctp_peeloff(3SOCKET)

NAME

       sctp_peeloff - branch off existing association from a one-to-many SCTP socket to create a one-to-one STP socket

SYNOPSIS

       cc [ flag... ] file... -lsocket -lnsl -lsctp [ library... ]
       #include <sys/types.h>
       #include <sys/socket.h>
       #include <netinet/sctp.h>

       int sctp_peeloff(int sock, sctp_assoc_t id);

DESCRIPTION

       The  sctp_peeloff() function branches off an existing association from a one-to-many style SCTP socket into a separate socket file descrip-
       tor. The resulting branched-off socket is a one-to-one style SCTP socket and is confined to operations allowed on a one-to-one  style  SCTP
       socket.

       The sock argument is a one-to-many socket. The association specified by the id argument is branched off sock.

RETURN VALUES

       Upon  successful  completion, the sctp_peeloff() function returns the file descriptor that references the branched-off socket. The function
       returns -1 if an error occurs.

ERRORS

       The sctp_peeloff() function fails under the following conditions.

       EOPTNOTSUPP     The sock argument is not a one-to-many style SCTP socket.

       EINVAL	       The id is 0 or greater than the maximum number of associations for sock.

       EMFILE	       Failure to create a new user file descriptor or file structure.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Evolving			   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |Safe			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       in.h(3HEAD), libsctp(3LIB), socket(3SOCKET), sctp(7P)

SunOS 5.10							    05 Mar 2004 					     sctp_peeloff(3SOCKET)