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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 FREEBSD

sctp_bindx

SCTP_BINDX(3)						   BSD Library Functions Manual 					     SCTP_BINDX(3)

NAME

     sctp_bindx -- bind or unbind an SCTP socket to a list of addresses.

LIBRARY

     Standard C Library (libc, -lc)

SYNOPSIS

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

     int
     sctp_bindx(int s, struct sockaddr *addrs, int num, int type);

DESCRIPTION

     The sctp_bindx() call binds or unbinds a address or a list of addresses to an SCTP endpoint.  This allows a user to bind a subset of
     addresses.  The sctp_bindx() call operates similarly to bind() but allows a list of addresses and also allows a bind or an unbind.  The argu-
     ment s must be a valid SCTP socket descriptor.  The argument addrs is a list of addresses (where the list may be only 1 in length) that the
     user wishes to bind or unbind to the socket.  The argument type must be one of the following values.

     SCTP_BINDX_ADD_ADDR This value indicates that the listed address(es) need to be added to the endpoint.

     SCTP_BINDX_DEL_ADDR This value indicates that the listed address(es) need to be removed from the endpoint.

     Note that when a user adds or deletes an address to an association if the dynamic address flag net.inet.sctp.auto_asconf is enabled any asso-
     ciations in the endpoint will attempt to have the address(es) added dynamically to the existing association.

RETURN VALUES

     The call returns 0 on success and -1 upon failure.

ERRORS

     The sctp_bindx() function can return the following errors:

     [EINVAL]		This value is returned if the type field is not one of the allowed values (see above).

     [ENOMEM]		This value is returned if the number of addresses being added causes a memory allocation failure in the call.

     [EBADF]		The argument s is not a valid descriptor.

     [ENOTSOCK] 	The argument s is not a socket.

SEE ALSO

     bind(2), sctp(4)

BSD
								 December 15, 2006							       BSD