sctp: fix to choose alternate destination when retransmit ASCONF chunk

RFC 5061 Section 5.1 ASCONF Chunk Procedures said:

B4)  Re-transmit the ASCONF Chunk last sent and if possible choose an
     alternate destination address (please refer to [RFC4960],
     Section 6.4.1).  An endpoint MUST NOT add new parameters to this
     chunk; it MUST be the same (including its Sequence Number) as
     the last ASCONF sent.  An endpoint MAY, however, bundle an
     additional ASCONF with new ASCONF parameters with the next
     Sequence Number.  For details, see Section 5.5.

This patch fix to choose an alternate destination address when
re-transmit the ASCONF chunk, with some dup codes cleanup.

Signed-off-by: Wei Yongjun <yjwei@cn.fujitsu.com>
Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com>

1 files changed, 2 insertions, 4 deletions

diff --git a/include/net/sctp/structs.h b/include/net/sctp/structs.h
index 23f08fe..edfcacf 100644
--- a/include/net/sctp/structs.h
+++ b/include/net/sctp/structs.h
@@ -1939,10 +1939,8 @@ void sctp_association_free(struct sctp_association *);
 void sctp_association_put(struct sctp_association *);
 void sctp_association_hold(struct sctp_association *);
 
-struct sctp_transport *sctp_assoc_choose_init_transport(
-	struct sctp_association *);
-struct sctp_transport *sctp_assoc_choose_shutdown_transport(
-	struct sctp_association *);
+struct sctp_transport *sctp_assoc_choose_alter_transport(
+	struct sctp_association *, struct sctp_transport *);
 void sctp_assoc_update_retran_path(struct sctp_association *);
 struct sctp_transport *sctp_assoc_lookup_paddr(const struct sctp_association *,
 					  const union sctp_addr *);