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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 DEBIAN

sctp_opt_info

SCTP_OPT_INFO(3)					     Linux Programmer's Manual						  SCTP_OPT_INFO(3)

NAME

       sctp_optinfo - Get options on a SCTP socket.

SYNOPSIS

       #include <sys/types.h>
       #include <sys/socket.h>
       #include <netinet/sctp.h>

       int sctp_opt_info(int sd, sctp_assoc_t id, int opt,
			 void * arg, socklen_t * size);

DESCRIPTION

       sctp_opt_info  is a wrapper library function that can be used to get SCTP level options on a socket.  sd is the socket descriptor for which
       the option is requested. For one-to-many style sockets, id specifies the association to query. For one-to-one style sockets, id is ignored.
       opt  specifes  the  SCTP  socket option to get.	arg is an option-specific structure buffer provided by the caller.  size is a value-result
       parameter, initially containing the size of the buffer pointed to by arg and modifed on return to indicate the actual  size  of	the  value
       returned.

RETURN VALUE

       On success, sctp_opt_info returns 0 and on failure -1 is returned with errno set to the appropriate error code.

SEE ALSO

       sctp(7)	sctp_bindx(3),	sctp_connectx(3), sctp_sendmsg(3), sctp_send(3), sctp_recvmsg(3), sctp_peeloff(3), sctp_getpaddrs(3), sctp_getlad-
       drs(3),

Linux 2.6							    2004-01-30							  SCTP_OPT_INFO(3)