sctp: add stream reconf primitive

This patch is to add a primitive based on sctp primitive frame for
sending stream reconf request. It works as the other primitives,
and create a SCTP_CMD_REPLY command to send the request chunk out.

sctp_primitive_RECONF would be the api to send a reconf request
chunk.

Signed-off-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/net/sctp/sm.h b/include/net/sctp/sm.h
index d2d9e28..430ed13 100644
--- a/include/net/sctp/sm.h
+++ b/include/net/sctp/sm.h
@@ -157,6 +157,7 @@
 sctp_state_fn_t sctp_sf_ignore_primitive;
 sctp_state_fn_t sctp_sf_do_prm_requestheartbeat;
 sctp_state_fn_t sctp_sf_do_prm_asconf;
+sctp_state_fn_t sctp_sf_do_prm_reconf;
 
 /* Prototypes for other event state functions.  */
 sctp_state_fn_t sctp_sf_do_no_pending_tsn;