[SCTP] Support for SCTP_GET_PEER_ADDR_INFO socket option.

include/net/sctp/user.h

@@ -485,6 +485,11 @@ struct sctp_paddrinfo {
 	__u32			spinfo_mtu;
 };
 
+/* Peer addresses's state. */
+enum sctp_spinfo_state {
+	SCTP_INACTIVE,
+	SCTP_ACTIVE,
+};
 
 /*
  * 7.1.1 Retransmission Timeout Parameters (SCTP_RTOINFO)

net/sctp/associola.c

@@ -556,12 +556,12 @@ void sctp_assoc_control_transport(struct sctp_association *asoc,
 	/* Record the transition on the transport.  */
 	switch (command) {
 	case SCTP_TRANSPORT_UP:
-		transport->active = 1;
+		transport->active = SCTP_ACTIVE;
 		spc_state = ADDRESS_AVAILABLE;
 		break;
 
 	case SCTP_TRANSPORT_DOWN:
-		transport->active = 0;
+		transport->active = SCTP_INACTIVE;
 		spc_state = ADDRESS_UNREACHABLE;
 		break;
 

net/sctp/transport.c

@@ -108,7 +108,7 @@ struct sctp_transport *sctp_transport_init(struct sctp_transport *peer,
 	peer->last_time_used = jiffies;
 	peer->last_time_ecne_reduced = jiffies;
 
-	peer->active = 1;
+	peer->active = SCTP_ACTIVE;
 	peer->hb_allowed = 0;
 
 	/* Initialize the default path max_retrans.  */