[SCTP] sctp_connectx() API support

Implements sctp_connectx() as defined in the SCTP sockets API draft by
tunneling the request through a setsockopt().

Signed-off-by: Frank Filz <[e-mail]>
Signed-off-by: Sridhar Samudrala <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

include/net/sctp/command.h

···
 	SCTP_CMD_TIMER_START,	/* Start a timer.  */
 	SCTP_CMD_TIMER_RESTART,	/* Restart a timer. */
 	SCTP_CMD_TIMER_STOP,	/* Stop a timer. */
-	SCTP_CMD_COUNTER_RESET, /* Reset a counter. */
-	SCTP_CMD_COUNTER_INC,   /* Increment a counter. */
+	SCTP_CMD_INIT_CHOOSE_TRANSPORT, /* Choose transport for an INIT. */
+	SCTP_CMD_INIT_COUNTER_RESET, /* Reset init counter. */
+	SCTP_CMD_INIT_COUNTER_INC,   /* Increment init counter. */
 	SCTP_CMD_INIT_RESTART,  /* High level, do init timer work. */
+	SCTP_CMD_COOKIEECHO_RESTART,  /* High level, do cookie-echo timer work. */
 	SCTP_CMD_INIT_FAILED,   /* High level, do init failure work. */
 	SCTP_CMD_REPORT_DUP,	/* Report a duplicate TSN.  */
 	SCTP_CMD_STRIKE,	/* Mark a strike against a transport.  */
···
 	int error;
 	sctp_state_t state;
 	sctp_event_timeout_t to;
-	sctp_counter_t counter;
 	void *ptr;
 	struct sctp_chunk *chunk;
 	struct sctp_association *asoc;
···
 SCTP_ARG_CONSTRUCTOR(U8,	__u8, u8)
 SCTP_ARG_CONSTRUCTOR(ERROR,     int, error)
 SCTP_ARG_CONSTRUCTOR(STATE,	sctp_state_t, state)
-SCTP_ARG_CONSTRUCTOR(COUNTER,	sctp_counter_t, counter)
 SCTP_ARG_CONSTRUCTOR(TO,	sctp_event_timeout_t, to)
 SCTP_ARG_CONSTRUCTOR(PTR,	void *, ptr)
 SCTP_ARG_CONSTRUCTOR(CHUNK,	struct sctp_chunk *, chunk)

include/net/sctp/constants.h

···
 enum { SCTP_MAX_DUP_TSNS = 16 };
 enum { SCTP_MAX_GABS = 16 };
 
-typedef enum {
-	SCTP_COUNTER_INIT_ERROR,
-} sctp_counter_t;
-
-/* How many counters does an association need? */
-#define SCTP_NUMBER_COUNTERS	5
-
 /* Here we define the default timers.  */
 
 /* cookie timer def = ? seconds */

include/net/sctp/sctp.h

···
 extern int sctp_debug_flag;
 #define SCTP_DEBUG_PRINTK(whatever...) \
 	((void) (sctp_debug_flag && printk(KERN_DEBUG whatever)))
+#define SCTP_DEBUG_PRINTK_IPADDR(lead, trail, leadparm, saddr, otherparms...) \
+	if (sctp_debug_flag) { \
+		if (saddr->sa.sa_family == AF_INET6) { \
+			printk(KERN_DEBUG \
+			       lead "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x" trail, \
+			       leadparm, \
+			       NIP6(saddr->v6.sin6_addr), \
+			       otherparms); \
+		} else { \
+			printk(KERN_DEBUG \
+			       lead "%u.%u.%u.%u" trail, \
+			       leadparm, \
+			       NIPQUAD(saddr->v4.sin_addr.s_addr), \
+			       otherparms); \
+		} \
+	}
 #define SCTP_ENABLE_DEBUG { sctp_debug_flag = 1; }
 #define SCTP_DISABLE_DEBUG { sctp_debug_flag = 0; }
 
···
 #else	/* SCTP_DEBUG */
 
 #define SCTP_DEBUG_PRINTK(whatever...)
+#define SCTP_DEBUG_PRINTK_IPADDR(whatever...)
 #define SCTP_ENABLE_DEBUG
 #define SCTP_DISABLE_DEBUG
 #define SCTP_ASSERT(expr, str, func)

include/net/sctp/sm.h

···
 sctp_state_fn_t sctp_sf_eat_sack_6_2;
 sctp_state_fn_t sctp_sf_tabort_8_4_8;
 sctp_state_fn_t sctp_sf_operr_notify;
-sctp_state_fn_t sctp_sf_t1_timer_expire;
+sctp_state_fn_t sctp_sf_t1_init_timer_expire;
+sctp_state_fn_t sctp_sf_t1_cookie_timer_expire;
 sctp_state_fn_t sctp_sf_t2_timer_expire;
 sctp_state_fn_t sctp_sf_t4_timer_expire;
 sctp_state_fn_t sctp_sf_t5_timer_expire;
···
 void sctp_chunk_assign_tsn(struct sctp_chunk *);
 void sctp_chunk_assign_ssn(struct sctp_chunk *);
 
-void sctp_stop_t1_and_abort(sctp_cmd_seq_t *commands, __u16 error);
+sctp_disposition_t  sctp_stop_t1_and_abort(sctp_cmd_seq_t *commands,
+					   __u16 error,
+					   const struct sctp_association *asoc,
+					   struct sctp_transport *transport);
 
 /* Prototypes for statetable processing. */
 

include/net/sctp/structs.h

···
 	 */
 	unsigned long last_time_ecne_reduced;
 
-	/* active      : The current active state of this destination,
-	 *	       :  i.e. DOWN, UP, etc.
+	/* The number of times INIT has been sent on this transport. */
+	int init_sent_count;
+
+	/* state       : The current state of this destination,
+	 *             : i.e. SCTP_ACTIVE, SCTP_INACTIVE, SCTP_UNKOWN.
 	 */
-	int active;
+	int state;
 
 	/* hb_allowed  : The current heartbeat state of this destination,
 	 *	       :  i.e. ALLOW-HB, NO-HEARTBEAT, etc.
···
 
 	/* sendbuf acct. policy.	*/
 	__u32 sndbuf_policy;
-
-	/* Name for debugging output... */
-	char *debug_name;
 };
 
 /* Recover the outter endpoint structure. */
···
 		 *	       : association. Normally this information is
 		 *	       : hashed or keyed for quick lookup and access
 		 *	       : of the TCB.
+		 *	       : The list is also initialized with the list
+		 *	       : of addresses passed with the sctp_connectx()
+		 *	       : call.
 		 *
 		 * It is a list of SCTP_transport's.
 		 */
 		struct list_head transport_addr_list;
+
+		/* transport_count
+		 *
+		 * Peer        : A count of the number of peer addresses
+		 * Transport   : in the Peer Transport Address List.
+		 * Address     :
+		 * Count       :
+		 */
+		__u16 transport_count;
 
 		/* port
 		 *   The transport layer port number.
···
 	/* Transport to which SHUTDOWN chunk was last sent.  */
 	struct sctp_transport *shutdown_last_sent_to;
 
+	/* Transport to which INIT chunk was last sent.  */
+	struct sctp_transport *init_last_sent_to;
+
 	/* Next TSN    : The next TSN number to be assigned to a new
 	 *	       : DATA chunk.  This is sent in the INIT or INIT
 	 *	       : ACK chunk to the peer and incremented each
···
 	/* The message size at which SCTP fragmentation will occur. */
 	__u32 frag_point;
 
-	/* Currently only one counter is used to count INIT errors. */
-	int counters[SCTP_NUMBER_COUNTERS];
+	/* Counter used to count INIT errors. */
+	int init_err_counter;
+
+	/* Count the number of INIT cycles (for doubling timeout). */
+	int init_cycle;
 
 	/* Default send parameters. */
 	__u16 default_stream;
···
 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 *);
 void sctp_assoc_update_retran_path(struct sctp_association *);
···
 			    const union sctp_addr *laddr);
 struct sctp_transport *sctp_assoc_add_peer(struct sctp_association *,
 				     const union sctp_addr *address,
-				     const int gfp);
+				     const int gfp,
+				     const int peer_state);
 void sctp_assoc_del_peer(struct sctp_association *asoc,
 			 const union sctp_addr *addr);
+void sctp_assoc_rm_peer(struct sctp_association *asoc,
+			 struct sctp_transport *peer);
 void sctp_assoc_control_transport(struct sctp_association *,
 				  struct sctp_transport *,
 				  sctp_transport_cmd_t, sctp_sn_error_t);

include/net/sctp/user.h

···
 #define SCTP_GET_LOCAL_ADDRS_NUM	SCTP_GET_LOCAL_ADDRS_NUM
 	SCTP_GET_LOCAL_ADDRS, 	/* Get all local addresss. */
 #define SCTP_GET_LOCAL_ADDRS	SCTP_GET_LOCAL_ADDRS
+	SCTP_SOCKOPT_CONNECTX, /* CONNECTX requests. */
+#define SCTP_SOCKOPT_CONNECTX	SCTP_SOCKOPT_CONNECTX
 };
 
 /*
···
 enum sctp_spinfo_state {
 	SCTP_INACTIVE,
 	SCTP_ACTIVE,
+	SCTP_UNKNOWN = 0xffff  /* Value used for transport state unknown */
 };
 
 /*

net/sctp/associola.c

···
 	asoc->last_cwr_tsn = asoc->ctsn_ack_point;
 	asoc->unack_data = 0;
 
-	SCTP_DEBUG_PRINTK("myctsnap for %s INIT as 0x%x.\n",
-			  asoc->ep->debug_name,
-			  asoc->ctsn_ack_point);
-
 	/* ADDIP Section 4.1 Asconf Chunk Procedures
 	 *
 	 * When an endpoint has an ASCONF signaled change to be sent to the
···
 
 	/* Make an empty list of remote transport addresses.  */
 	INIT_LIST_HEAD(&asoc->peer.transport_addr_list);
+	asoc->peer.transport_count = 0;
 
 	/* RFC 2960 5.1 Normal Establishment of an Association
 	 *
···
 
 	asoc->base.malloced = 1;
 	SCTP_DBG_OBJCNT_INC(assoc);
+	SCTP_DEBUG_PRINTK("Created asoc %p\n", asoc);
 
 	return asoc;
 
···
 		sctp_transport_free(transport);
 	}
 
+	asoc->peer.transport_count = 0;
+
 	/* Free any cached ASCONF_ACK chunk. */
 	if (asoc->addip_last_asconf_ack)
 		sctp_chunk_free(asoc->addip_last_asconf_ack);
···
 	/* If the primary path is changing, assume that the
 	 * user wants to use this new path.
 	 */
-	if (transport->active)
+	if (transport->state != SCTP_INACTIVE)
 		asoc->peer.active_path = transport;
 
 	/*
···
 	transport->cacc.next_tsn_at_change = asoc->next_tsn;
 }
 
+/* Remove a transport from an association.  */
+void sctp_assoc_rm_peer(struct sctp_association *asoc,
+			struct sctp_transport *peer)
+{
+	struct list_head	*pos;
+	struct sctp_transport	*transport;
+
+	SCTP_DEBUG_PRINTK_IPADDR("sctp_assoc_rm_peer:association %p addr: ",
+				 " port: %d\n",
+				 asoc,
+				 (&peer->ipaddr),
+				 peer->ipaddr.v4.sin_port);
+
+	/* If we are to remove the current retran_path, update it
+	 * to the next peer before removing this peer from the list.
+	 */
+	if (asoc->peer.retran_path == peer)
+		sctp_assoc_update_retran_path(asoc);
+
+	/* Remove this peer from the list. */
+	list_del(&peer->transports);
+
+	/* Get the first transport of asoc. */
+	pos = asoc->peer.transport_addr_list.next;
+	transport = list_entry(pos, struct sctp_transport, transports);
+
+	/* Update any entries that match the peer to be deleted. */
+	if (asoc->peer.primary_path == peer)
+		sctp_assoc_set_primary(asoc, transport);
+	if (asoc->peer.active_path == peer)
+		asoc->peer.active_path = transport;
+	if (asoc->peer.last_data_from == peer)
+		asoc->peer.last_data_from = transport;
+
+	/* If we remove the transport an INIT was last sent to, set it to
+	 * NULL. Combined with the update of the retran path above, this
+	 * will cause the next INIT to be sent to the next available
+	 * transport, maintaining the cycle.
+	 */
+	if (asoc->init_last_sent_to == peer)
+		asoc->init_last_sent_to = NULL;
+
+	asoc->peer.transport_count--;
+
+	sctp_transport_free(peer);
+}
+
 /* Add a transport address to an association.  */
 struct sctp_transport *sctp_assoc_add_peer(struct sctp_association *asoc,
 					   const union sctp_addr *addr,
-					   int gfp)
+					   const int gfp,
+					   const int peer_state)
 {
 	struct sctp_transport *peer;
 	struct sctp_sock *sp;
···
 	/* AF_INET and AF_INET6 share common port field. */
 	port = addr->v4.sin_port;
 
+	SCTP_DEBUG_PRINTK_IPADDR("sctp_assoc_add_peer:association %p addr: ",
+				 " port: %d state:%s\n",
+				 asoc,
+				 addr,
+				 addr->v4.sin_port,
+				 peer_state == SCTP_UNKNOWN?"UNKNOWN":"ACTIVE");
+
 	/* Set the port if it has not been set yet.  */
 	if (0 == asoc->peer.port)
 		asoc->peer.port = port;
 
 	/* Check to see if this is a duplicate. */
 	peer = sctp_assoc_lookup_paddr(asoc, addr);
-	if (peer)
+	if (peer) {
+		if (peer_state == SCTP_ACTIVE &&
+		    peer->state == SCTP_UNKNOWN)
+		     peer->state = SCTP_ACTIVE;
 		return peer;
+	}
 
 	peer = sctp_transport_new(addr, gfp);
 	if (!peer)
···
 	/* Set the transport's RTO.initial value */
 	peer->rto = asoc->rto_initial;
 
+	/* Set the peer's active state. */
+	peer->state = peer_state;
+
 	/* Attach the remote transport to our asoc.  */
 	list_add_tail(&peer->transports, &asoc->peer.transport_addr_list);
+	asoc->peer.transport_count++;
 
 	/* If we do not yet have a primary path, set one.  */
 	if (!asoc->peer.primary_path) {
···
 		asoc->peer.retran_path = peer;
 	}
 
-	if (asoc->peer.active_path == asoc->peer.retran_path)
+	if (asoc->peer.active_path == asoc->peer.retran_path) {
 		asoc->peer.retran_path = peer;
+	}
 
 	return peer;
 }
···
 {
 	struct list_head	*pos;
 	struct list_head	*temp;
-	struct sctp_transport	*peer = NULL;
 	struct sctp_transport	*transport;
 
 	list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) {
 		transport = list_entry(pos, struct sctp_transport, transports);
 		if (sctp_cmp_addr_exact(addr, &transport->ipaddr)) {
-			peer = transport;
-			list_del(pos);
+			/* Do book keeping for removing the peer and free it. */
+			sctp_assoc_rm_peer(asoc, transport);
 			break;
 		}
 	}
-
-	/* The address we want delete is not in the association. */
-	if (!peer)
-		return;
-
-	/* Get the first transport of asoc. */ 
-	pos = asoc->peer.transport_addr_list.next;
-	transport = list_entry(pos, struct sctp_transport, transports);
-
-	/* Update any entries that match the peer to be deleted. */  
-	if (asoc->peer.primary_path == peer)
-		sctp_assoc_set_primary(asoc, transport);
-	if (asoc->peer.active_path == peer)
-		asoc->peer.active_path = transport;
-	if (asoc->peer.retran_path == peer)
-		asoc->peer.retran_path = transport;
-	if (asoc->peer.last_data_from == peer)
-		asoc->peer.last_data_from = transport;
-
-	sctp_transport_free(peer);
 }
 
 /* Lookup a transport by address. */
···
 	/* Record the transition on the transport.  */
 	switch (command) {
 	case SCTP_TRANSPORT_UP:
-		transport->active = SCTP_ACTIVE;
+		transport->state = SCTP_ACTIVE;
 		spc_state = SCTP_ADDR_AVAILABLE;
 		break;
 
 	case SCTP_TRANSPORT_DOWN:
-		transport->active = SCTP_INACTIVE;
+		transport->state = SCTP_INACTIVE;
 		spc_state = SCTP_ADDR_UNREACHABLE;
 		break;
 
···
 	list_for_each(pos, &asoc->peer.transport_addr_list) {
 		t = list_entry(pos, struct sctp_transport, transports);
 
-		if (!t->active)
+		if (t->state == SCTP_INACTIVE)
 			continue;
 		if (!first || t->last_time_heard > first->last_time_heard) {
 			second = first;
···
 	 * [If the primary is active but not most recent, bump the most
 	 * recently used transport.]
 	 */
-	if (asoc->peer.primary_path->active &&
+	if (asoc->peer.primary_path->state != SCTP_INACTIVE &&
 	    first != asoc->peer.primary_path) {
 		second = first;
 		first = asoc->peer.primary_path;
···
 					   transports);
 			if (!sctp_assoc_lookup_paddr(asoc, &trans->ipaddr))
 				sctp_assoc_add_peer(asoc, &trans->ipaddr,
-						    GFP_ATOMIC);
+						    GFP_ATOMIC, SCTP_ACTIVE);
 		}
 
 		asoc->ctsn_ack_point = asoc->next_tsn - 1;
···
 
 		/* Try to find an active transport. */
 
-		if (t->active) {
+		if (t->state != SCTP_INACTIVE) {
 			break;
 		} else {
 			/* Keep track of the next transport in case
···
 	}
 
 	asoc->peer.retran_path = t;
+
+	SCTP_DEBUG_PRINTK_IPADDR("sctp_assoc_update_retran_path:association"
+				 " %p addr: ",
+				 " port: %d\n",
+				 asoc,
+				 (&t->ipaddr),
+				 t->ipaddr.v4.sin_port);
+}
+
+/* Choose the transport for sending a INIT packet.  */
+struct sctp_transport *sctp_assoc_choose_init_transport(
+	struct sctp_association *asoc)
+{
+	struct sctp_transport *t;
+
+	/* Use the retran path. If the last INIT was sent over the
+	 * retran path, update the retran path and use it.
+	 */
+	if (!asoc->init_last_sent_to) {
+		t = asoc->peer.active_path;
+	} else {
+		if (asoc->init_last_sent_to == asoc->peer.retran_path)
+			sctp_assoc_update_retran_path(asoc);
+		t = asoc->peer.retran_path;
+	}
+
+	SCTP_DEBUG_PRINTK_IPADDR("sctp_assoc_update_retran_path:association"
+				 " %p addr: ",
+				 " port: %d\n",
+				 asoc,
+				 (&t->ipaddr),
+				 t->ipaddr.v4.sin_port);
+
+	return t;
 }
 
 /* Choose the transport for sending a SHUTDOWN packet.  */

net/sctp/endpointola.c

···
 	ep->last_key = ep->current_key = 0;
 	ep->key_changed_at = jiffies;
 
-	ep->debug_name = "unnamedEndpoint";
 	return ep;
 }
 

net/sctp/input.c

···
 
 	sctp_do_sm(SCTP_EVENT_T_OTHER,
 		   SCTP_ST_OTHER(SCTP_EVENT_ICMP_PROTO_UNREACH),
-		   asoc->state, asoc->ep, asoc, NULL,
+		   asoc->state, asoc->ep, asoc, t,
 		   GFP_ATOMIC);
 
 }

net/sctp/outqueue.c

···
 
 		if (!new_transport) {
 			new_transport = asoc->peer.active_path;
-		} else if (!new_transport->active) {
-			/* If the chunk is Heartbeat or Heartbeat Ack, 
-			 * send it to chunk->transport, even if it's 
+		} else if (new_transport->state == SCTP_INACTIVE) {
+			/* If the chunk is Heartbeat or Heartbeat Ack,
+			 * send it to chunk->transport, even if it's
 			 * inactive.
 			 *
 			 * 3.3.6 Heartbeat Acknowledgement:
···
 			 * Otherwise, we want to use the active path.
 			 */
 			new_transport = chunk->transport;
-			if (!new_transport || !new_transport->active)
+			if (!new_transport ||
+			    new_transport->state == SCTP_INACTIVE)
 				new_transport = asoc->peer.active_path;
 
 			/* Change packets if necessary.  */
···
 			/* Mark the destination transport address as
 			 * active if it is not so marked.
 			 */
-			if (!transport->active) {
+			if (transport->state == SCTP_INACTIVE) {
 				sctp_assoc_control_transport(
 					transport->asoc,
 					transport,

net/sctp/sm_make_chunk.c

···
 	 * be a a better choice than any of the embedded addresses.
 	 */
 	if (peer_addr)
-		if(!sctp_assoc_add_peer(asoc, peer_addr, gfp))
+		if(!sctp_assoc_add_peer(asoc, peer_addr, gfp, SCTP_ACTIVE))
 			goto nomem;
 
 	/* Process the initialization parameters.  */
···
 
 		if (!sctp_process_param(asoc, param, peer_addr, gfp))
                         goto clean_up;
+	}
+
+	/* Walk list of transports, removing transports in the UNKNOWN state. */
+	list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) {
+		transport = list_entry(pos, struct sctp_transport, transports);
+		if (transport->state == SCTP_UNKNOWN) {
+			sctp_assoc_rm_peer(asoc, transport);
+		}
 	}
 
 	/* The fixed INIT headers are always in network byte
···
 	 * stream sequence number shall be set to 0.
 	 */
 
-	/* Allocate storage for the negotiated streams if it is not a temporary 	 * association.
+	/* Allocate storage for the negotiated streams if it is not a temporary
+ 	 * association.
 	 */
 	if (!asoc->temp) {
 		int assoc_id;
···
 		list_del_init(pos);
 		sctp_transport_free(transport);
 	}
+
+	asoc->peer.transport_count = 0;
+
 nomem:
 	return 0;
 }
···
 		af->from_addr_param(&addr, param.addr, asoc->peer.port, 0);
 		scope = sctp_scope(peer_addr);
 		if (sctp_in_scope(&addr, scope))
-			if (!sctp_assoc_add_peer(asoc, &addr, gfp))
+			if (!sctp_assoc_add_peer(asoc, &addr, gfp, SCTP_ACTIVE))
 				return 0;
 		break;
 
···
 	 	 * Due to Resource Shortage'.
 	 	 */
 
-		peer = sctp_assoc_add_peer(asoc, &addr, GFP_ATOMIC);
+		peer = sctp_assoc_add_peer(asoc, &addr, GFP_ATOMIC, SCTP_ACTIVE);
 		if (!peer)
 			return SCTP_ERROR_RSRC_LOW;
 

net/sctp/sm_sideeffect.c

···
 	 */
 	asoc->overall_error_count++;
 
-	if (transport->active &&
+	if (transport->state != SCTP_INACTIVE &&
 	    (transport->error_count++ >= transport->max_retrans)) {
-		SCTP_DEBUG_PRINTK("transport_strike: transport "
-				  "IP:%d.%d.%d.%d failed.\n",
-				  NIPQUAD(transport->ipaddr.v4.sin_addr));
+		SCTP_DEBUG_PRINTK_IPADDR("transport_strike:association %p",
+					 " transport IP: port:%d failed.\n",
+					 asoc,
+					 (&transport->ipaddr),
+					 transport->ipaddr.v4.sin_port);
 		sctp_assoc_control_transport(asoc, transport,
 					     SCTP_TRANSPORT_DOWN,
 					     SCTP_FAILED_THRESHOLD);
···
 	/* Mark the destination transport address as active if it is not so
 	 * marked.
 	 */
-	if (!t->active)
+	if (t->state == SCTP_INACTIVE)
 		sctp_assoc_control_transport(asoc, t, SCTP_TRANSPORT_UP,
 					     SCTP_HEARTBEAT_SUCCESS);
 
···
 
 	asoc->state = state;
 
+	SCTP_DEBUG_PRINTK("sctp_cmd_new_state: asoc %p[%s]\n",
+			  asoc, sctp_state_tbl[state]);
+
 	if (sctp_style(sk, TCP)) {
-		/* Change the sk->sk_state of a TCP-style socket that has 
+		/* Change the sk->sk_state of a TCP-style socket that has
 		 * sucessfully completed a connect() call.
 		 */
 		if (sctp_state(asoc, ESTABLISHED) && sctp_sstate(sk, CLOSED))
···
 		if (sctp_state(asoc, SHUTDOWN_RECEIVED) &&
 		    sctp_sstate(sk, ESTABLISHED))
 			sk->sk_shutdown |= RCV_SHUTDOWN;
+	}
+
+	if (sctp_state(asoc, COOKIE_WAIT)) {
+		/* Reset init timeouts since they may have been
+		 * increased due to timer expirations.
+		 */
+		asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_INIT] =
+			asoc->ep->timeouts[SCTP_EVENT_TIMEOUT_T1_INIT];
+		asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_COOKIE] =
+			asoc->ep->timeouts[SCTP_EVENT_TIMEOUT_T1_COOKIE];
 	}
 
 	if (sctp_state(asoc, ESTABLISHED) ||
···
 			 * to be executed only during failed attempts of
 			 * association establishment.
 			 */
-			if ((asoc->peer.retran_path != 
-			     asoc->peer.primary_path) && 
-			    (asoc->counters[SCTP_COUNTER_INIT_ERROR] > 0)) {
-				sctp_add_cmd_sf(commands, 
+			if ((asoc->peer.retran_path !=
+			     asoc->peer.primary_path) &&
+			    (asoc->init_err_counter > 0)) {
+				sctp_add_cmd_sf(commands,
 				                SCTP_CMD_FORCE_PRIM_RETRAN,
 						SCTP_NULL());
 			}
···
 				sctp_association_put(asoc);
 			break;
 
+		case SCTP_CMD_INIT_CHOOSE_TRANSPORT:
+			chunk = cmd->obj.ptr;
+			t = sctp_assoc_choose_init_transport(asoc);
+			asoc->init_last_sent_to = t;
+			chunk->transport = t;
+			t->init_sent_count++;
+			break;
+
 		case SCTP_CMD_INIT_RESTART:
 			/* Do the needed accounting and updates
 			 * associated with restarting an initialization
-			 * timer.
+			 * timer. Only multiply the timeout by two if
+			 * all transports have been tried at the current
+			 * timeout.
 			 */
-			asoc->counters[SCTP_COUNTER_INIT_ERROR]++;
-			asoc->timeouts[cmd->obj.to] *= 2;
-			if (asoc->timeouts[cmd->obj.to] >
+			t = asoc->init_last_sent_to;
+			asoc->init_err_counter++;
+
+			if (t->init_sent_count > (asoc->init_cycle + 1)) {
+				asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_INIT] *= 2;
+				if (asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_INIT] >
+				    asoc->max_init_timeo) {
+					asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_INIT] =
+						asoc->max_init_timeo;
+				}
+				asoc->init_cycle++;
+				SCTP_DEBUG_PRINTK(
+					"T1 INIT Timeout adjustment"
+					" init_err_counter: %d"
+					" cycle: %d"
+					" timeout: %d\n",
+					asoc->init_err_counter,
+					asoc->init_cycle,
+					asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_INIT]);
+			}
+
+			sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_RESTART,
+					SCTP_TO(SCTP_EVENT_TIMEOUT_T1_INIT));
+			break;
+
+		case SCTP_CMD_COOKIEECHO_RESTART:
+			/* Do the needed accounting and updates
+			 * associated with restarting an initialization
+			 * timer. Only multiply the timeout by two if
+			 * all transports have been tried at the current
+			 * timeout.
+			 */
+			asoc->init_err_counter++;
+
+			asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_COOKIE] *= 2;
+			if (asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_COOKIE] >
 			    asoc->max_init_timeo) {
-				asoc->timeouts[cmd->obj.to] =
+				asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_COOKIE] =
 					asoc->max_init_timeo;
 			}
+			SCTP_DEBUG_PRINTK(
+				"T1 COOKIE Timeout adjustment"
+				" init_err_counter: %d"
+				" timeout: %d\n",
+				asoc->init_err_counter,
+				asoc->timeouts[SCTP_EVENT_TIMEOUT_T1_COOKIE]);
 
 			/* If we've sent any data bundled with
 			 * COOKIE-ECHO we need to resend.
···
 
 			sctp_add_cmd_sf(commands,
 					SCTP_CMD_TIMER_RESTART,
-					SCTP_TO(cmd->obj.to));
+					SCTP_TO(SCTP_EVENT_TIMEOUT_T1_COOKIE));
 			break;
 
 		case SCTP_CMD_INIT_FAILED:
···
 					      subtype, chunk, cmd->obj.u32);
 			break;
 
-		case SCTP_CMD_COUNTER_INC:
-			asoc->counters[cmd->obj.counter]++;
+		case SCTP_CMD_INIT_COUNTER_INC:
+			asoc->init_err_counter++;
 			break;
 
-		case SCTP_CMD_COUNTER_RESET:
-			asoc->counters[cmd->obj.counter] = 0;
+		case SCTP_CMD_INIT_COUNTER_RESET:
+			asoc->init_err_counter = 0;
+			asoc->init_cycle = 0;
 			break;
 
 		case SCTP_CMD_REPORT_DUP:

net/sctp/sm_statefuns.c

···
 	sctp_add_cmd_sf(commands, SCTP_CMD_PEER_INIT,
 			SCTP_PEER_INIT(initchunk));
 
+	/* Reset init error count upon receipt of INIT-ACK.  */
+	sctp_add_cmd_sf(commands, SCTP_CMD_INIT_COUNTER_RESET, SCTP_NULL());
+
 	/* 5.1 C) "A" shall stop the T1-init timer and leave
 	 * COOKIE-WAIT state.  "A" shall then ... start the T1-cookie
 	 * timer, and enter the COOKIE-ECHOED state.
···
 	 * from the COOKIE-ECHOED state to the COOKIE-WAIT
 	 * state is performed.
 	 */
-	sctp_add_cmd_sf(commands, SCTP_CMD_COUNTER_RESET,
-	                SCTP_COUNTER(SCTP_COUNTER_INIT_ERROR));
+	sctp_add_cmd_sf(commands, SCTP_CMD_INIT_COUNTER_RESET, SCTP_NULL());
 
 	/* RFC 2960 5.1 Normal Establishment of an Association
 	 *
···
 	link = sctp_assoc_lookup_paddr(asoc, &from_addr);
 
 	/* This should never happen, but lets log it if so.  */
-	if (!link) {
-		printk(KERN_WARNING
-		       "%s: Could not find address %d.%d.%d.%d\n",
-		       __FUNCTION__, NIPQUAD(from_addr.v4.sin_addr));
+	if (unlikely(!link)) {
+		if (from_addr.sa.sa_family == AF_INET6) {
+			printk(KERN_WARNING
+			       "%s association %p could not find address "
+			       "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
+			       __FUNCTION__,
+			       asoc,
+			       NIP6(from_addr.v6.sin6_addr));
+		} else {
+			printk(KERN_WARNING
+			       "%s association %p could not find address "
+			       "%u.%u.%u.%u\n",
+			       __FUNCTION__,
+			       asoc,
+			       NIPQUAD(from_addr.v4.sin_addr.s_addr));
+		}
 		return SCTP_DISPOSITION_DISCARD;
 	}
 
···
 	sctp_errhdr_t *err;
 	struct sctp_chunk *reply;
 	struct sctp_bind_addr *bp;
-	int attempts;
-
-	attempts = asoc->counters[SCTP_COUNTER_INIT_ERROR] + 1;
+	int attempts = asoc->init_err_counter + 1;
 
 	if (attempts >= asoc->max_init_attempts) {
 		sctp_add_cmd_sf(commands, SCTP_CMD_INIT_FAILED,
···
 	/* Cast away the const modifier, as we want to just
 	 * rerun it through as a sideffect.
 	 */
-	sctp_add_cmd_sf(commands, SCTP_CMD_COUNTER_INC,
-			SCTP_COUNTER(SCTP_COUNTER_INIT_ERROR));
+	sctp_add_cmd_sf(commands, SCTP_CMD_INIT_COUNTER_INC, SCTP_NULL());
 
 	sctp_add_cmd_sf(commands, SCTP_CMD_TIMER_STOP,
 			SCTP_TO(SCTP_EVENT_TIMEOUT_T1_COOKIE));
···
 	if (len >= sizeof(struct sctp_chunkhdr) + sizeof(struct sctp_errhdr))
 		error = ((sctp_errhdr_t *)chunk->skb->data)->cause;
 
- 	sctp_stop_t1_and_abort(commands, error);
-	return SCTP_DISPOSITION_ABORT;
+	return sctp_stop_t1_and_abort(commands, error, asoc, chunk->transport);
 }
 
 /*
···
 					void *arg,
 					sctp_cmd_seq_t *commands)
 {
-	sctp_stop_t1_and_abort(commands, SCTP_ERROR_NO_ERROR);
- 	return SCTP_DISPOSITION_ABORT;
+	return sctp_stop_t1_and_abort(commands, SCTP_ERROR_NO_ERROR, asoc,
+				      (struct sctp_transport *)arg);
 }
 
 /*
···
  *
  * This is common code called by several sctp_sf_*_abort() functions above.
  */
-void sctp_stop_t1_and_abort(sctp_cmd_seq_t *commands, __u16 error)
+sctp_disposition_t  sctp_stop_t1_and_abort(sctp_cmd_seq_t *commands,
+					   __u16 error,
+					   const struct sctp_association *asoc,
+					   struct sctp_transport *transport)
 {
+	SCTP_DEBUG_PRINTK("ABORT received (INIT).\n");
 	sctp_add_cmd_sf(commands, SCTP_CMD_NEW_STATE,
 			SCTP_STATE(SCTP_STATE_CLOSED));
 	SCTP_INC_STATS(SCTP_MIB_ABORTEDS);
···
 	/* CMD_INIT_FAILED will DELETE_TCB. */
 	sctp_add_cmd_sf(commands, SCTP_CMD_INIT_FAILED,
 			SCTP_U32(error));
+	return SCTP_DISPOSITION_ABORT;
 }
 
 /*
···
 	sctp_add_cmd_sf(commands, SCTP_CMD_NEW_ASOC,
 			SCTP_ASOC((struct sctp_association *) asoc));
 
+	/* Choose transport for INIT. */
+	sctp_add_cmd_sf(commands, SCTP_CMD_INIT_CHOOSE_TRANSPORT,
+			SCTP_CHUNK(repl));
+
 	/* After sending the INIT, "A" starts the T1-init timer and
 	 * enters the COOKIE-WAIT state.
 	 */
···
 }
 
 /*
- * sctp_sf_t1_timer_expire
+ * sctp_sf_t1_init_timer_expire
  *
  * Section: 4 Note: 2
  * Verification Tag:
···
  *     endpoint MUST abort the initialization process and report the
  *     error to SCTP user.
  *
- *   3) If the T1-cookie timer expires, the endpoint MUST retransmit
+ * Outputs
+ * (timers, events)
+ *
+ */
+sctp_disposition_t sctp_sf_t1_init_timer_expire(const struct sctp_endpoint *ep,
+					   const struct sctp_association *asoc,
+					   const sctp_subtype_t type,
+					   void *arg,
+					   sctp_cmd_seq_t *commands)
+{
+	struct sctp_chunk *repl = NULL;
+	struct sctp_bind_addr *bp;
+	int attempts = asoc->init_err_counter + 1;
+
+	SCTP_DEBUG_PRINTK("Timer T1 expired (INIT).\n");
+
+	if (attempts < asoc->max_init_attempts) {
+		bp = (struct sctp_bind_addr *) &asoc->base.bind_addr;
+		repl = sctp_make_init(asoc, bp, GFP_ATOMIC, 0);
+		if (!repl)
+			return SCTP_DISPOSITION_NOMEM;
+
+		/* Choose transport for INIT. */
+		sctp_add_cmd_sf(commands, SCTP_CMD_INIT_CHOOSE_TRANSPORT,
+				SCTP_CHUNK(repl));
+
+		/* Issue a sideeffect to do the needed accounting. */
+		sctp_add_cmd_sf(commands, SCTP_CMD_INIT_RESTART,
+				SCTP_TO(SCTP_EVENT_TIMEOUT_T1_INIT));
+
+		sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(repl));
+	} else {
+		SCTP_DEBUG_PRINTK("Giving up on INIT, attempts: %d"
+				  " max_init_attempts: %d\n",
+				  attempts, asoc->max_init_attempts);
+		sctp_add_cmd_sf(commands, SCTP_CMD_INIT_FAILED,
+				SCTP_U32(SCTP_ERROR_NO_ERROR));
+		return SCTP_DISPOSITION_DELETE_TCB;
+	}
+
+	return SCTP_DISPOSITION_CONSUME;
+}
+
+/*
+ * sctp_sf_t1_cookie_timer_expire
+ *
+ * Section: 4 Note: 2
+ * Verification Tag:
+ * Inputs
+ * (endpoint, asoc)
+ *
+ *  RFC 2960 Section 4 Notes
+ *  3) If the T1-cookie timer expires, the endpoint MUST retransmit
  *     COOKIE ECHO and re-start the T1-cookie timer without changing
  *     state.  This MUST be repeated up to 'Max.Init.Retransmits' times.
  *     After that, the endpoint MUST abort the initialization process and
···
  * (timers, events)
  *
  */
-sctp_disposition_t sctp_sf_t1_timer_expire(const struct sctp_endpoint *ep,
+sctp_disposition_t sctp_sf_t1_cookie_timer_expire(const struct sctp_endpoint *ep,
 					   const struct sctp_association *asoc,
 					   const sctp_subtype_t type,
 					   void *arg,
 					   sctp_cmd_seq_t *commands)
 {
-	struct sctp_chunk *repl;
-	struct sctp_bind_addr *bp;
-	sctp_event_timeout_t timer = (sctp_event_timeout_t) arg;
-	int timeout;
-	int attempts;
+	struct sctp_chunk *repl = NULL;
+	int attempts = asoc->init_err_counter + 1;
 
-	timeout = asoc->timeouts[timer];
-	attempts = asoc->counters[SCTP_COUNTER_INIT_ERROR] + 1;
-	repl = NULL;
-
-	SCTP_DEBUG_PRINTK("Timer T1 expired.\n");
+	SCTP_DEBUG_PRINTK("Timer T1 expired (COOKIE-ECHO).\n");
 
 	if (attempts < asoc->max_init_attempts) {
-		switch (timer) {
-		case SCTP_EVENT_TIMEOUT_T1_INIT:
-			bp = (struct sctp_bind_addr *) &asoc->base.bind_addr;
-			repl = sctp_make_init(asoc, bp, GFP_ATOMIC, 0);
-			break;
-
-		case SCTP_EVENT_TIMEOUT_T1_COOKIE:
-			repl = sctp_make_cookie_echo(asoc, NULL);
-			break;
-
-		default:
-			BUG();
-			break;
-		};
-
+		repl = sctp_make_cookie_echo(asoc, NULL);
 		if (!repl)
-			goto nomem;
+			return SCTP_DISPOSITION_NOMEM;
 
 		/* Issue a sideeffect to do the needed accounting. */
-		sctp_add_cmd_sf(commands, SCTP_CMD_INIT_RESTART,
-				SCTP_TO(timer));
+		sctp_add_cmd_sf(commands, SCTP_CMD_COOKIEECHO_RESTART,
+				SCTP_TO(SCTP_EVENT_TIMEOUT_T1_COOKIE));
+
 		sctp_add_cmd_sf(commands, SCTP_CMD_REPLY, SCTP_CHUNK(repl));
 	} else {
 		sctp_add_cmd_sf(commands, SCTP_CMD_INIT_FAILED,
···
 	}
 
 	return SCTP_DISPOSITION_CONSUME;
-
-nomem:
-	return SCTP_DISPOSITION_NOMEM;
 }
 
 /* RFC2960 9.2 If the timer expires, the endpoint must re-send the SHUTDOWN

net/sctp/sm_statetable.c

···
 	/* SCTP_STATE_COOKIE_WAIT */ \
 	{.fn = sctp_sf_bug, .name = "sctp_sf_bug"}, \
 	/* SCTP_STATE_COOKIE_ECHOED */ \
-	{.fn = sctp_sf_t1_timer_expire, .name = "sctp_sf_t1_timer_expire"}, \
+	{.fn = sctp_sf_t1_cookie_timer_expire, \
+	 .name = "sctp_sf_t1_cookie_timer_expire"}, \
 	/* SCTP_STATE_ESTABLISHED */ \
 	{.fn = sctp_sf_timer_ignore, .name = "sctp_sf_timer_ignore"}, \
 	/* SCTP_STATE_SHUTDOWN_PENDING */ \
···
 	/* SCTP_STATE_CLOSED */ \
 	{.fn = sctp_sf_timer_ignore, .name = "sctp_sf_timer_ignore"}, \
 	/* SCTP_STATE_COOKIE_WAIT */ \
-	{.fn = sctp_sf_t1_timer_expire, .name = "sctp_sf_t1_timer_expire"}, \
+	{.fn = sctp_sf_t1_init_timer_expire, \
+	 .name = "sctp_sf_t1_init_timer_expire"}, \
 	/* SCTP_STATE_COOKIE_ECHOED */ \
 	{.fn = sctp_sf_timer_ignore, .name = "sctp_sf_timer_ignore"}, \
 	/* SCTP_STATE_ESTABLISHED */ \

net/sctp/socket.c

···
  *             sockaddr_in6 [RFC 2553]),
  *   addr_len - the size of the address structure.
  */
-SCTP_STATIC int sctp_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
+SCTP_STATIC int sctp_bind(struct sock *sk, struct sockaddr *addr, int addr_len)
 {
 	int retval = 0;
 
 	sctp_lock_sock(sk);
 
-	SCTP_DEBUG_PRINTK("sctp_bind(sk: %p, uaddr: %p, addr_len: %d)\n",
-			  sk, uaddr, addr_len);
+	SCTP_DEBUG_PRINTK("sctp_bind(sk: %p, addr: %p, addr_len: %d)\n",
+			  sk, addr, addr_len);
 
 	/* Disallow binding twice. */
 	if (!sctp_sk(sk)->ep->base.bind_addr.port)
-		retval = sctp_do_bind(sk, (union sctp_addr *)uaddr,
+		retval = sctp_do_bind(sk, (union sctp_addr *)addr,
 				      addr_len);
 	else
 		retval = -EINVAL;
···
 	unsigned short snum;
 	int ret = 0;
 
-	SCTP_DEBUG_PRINTK("sctp_do_bind(sk: %p, newaddr: %p, len: %d)\n",
-			  sk, addr, len);
-
 	/* Common sockaddr verification. */
 	af = sctp_sockaddr_af(sp, addr, len);
-	if (!af)
+	if (!af) {
+		SCTP_DEBUG_PRINTK("sctp_do_bind(sk: %p, newaddr: %p, len: %d) EINVAL\n",
+				  sk, addr, len);
 		return -EINVAL;
+	}
+
+	snum = ntohs(addr->v4.sin_port);
+
+	SCTP_DEBUG_PRINTK_IPADDR("sctp_do_bind(sk: %p, new addr: ",
+				 ", port: %d, new port: %d, len: %d)\n",
+				 sk,
+				 addr,
+				 bp->port, snum,
+				 len);
 
 	/* PF specific bind() address verification. */
 	if (!sp->pf->bind_verify(sp, addr))
 		return -EADDRNOTAVAIL;
-
-	snum= ntohs(addr->v4.sin_port);
-
-	SCTP_DEBUG_PRINTK("sctp_do_bind: port: %d, new port: %d\n",
-			  bp->port, snum);
 
 	/* We must either be unbound, or bind to the same port.  */
 	if (bp->port && (snum != bp->port)) {
···
  *
  * Basically do nothing but copying the addresses from user to kernel
  * land and invoking either sctp_bindx_add() or sctp_bindx_rem() on the sk.
- * This is used for tunneling the sctp_bindx() request through sctp_setsockopt() * from userspace.
+ * This is used for tunneling the sctp_bindx() request through sctp_setsockopt()
+ * from userspace.
  *
  * We don't use copy_from_user() for optimization: we first do the
  * sanity checks (buffer size -fast- and access check-healthy
···
 out:
 	kfree(kaddrs);
 
+	return err;
+}
+
+/* __sctp_connect(struct sock* sk, struct sockaddr *kaddrs, int addrs_size)
+ *
+ * Common routine for handling connect() and sctp_connectx().
+ * Connect will come in with just a single address.
+ */
+static int __sctp_connect(struct sock* sk,
+			  struct sockaddr *kaddrs,
+			  int addrs_size)
+{
+	struct sctp_sock *sp;
+	struct sctp_endpoint *ep;
+	struct sctp_association *asoc = NULL;
+	struct sctp_association *asoc2;
+	struct sctp_transport *transport;
+	union sctp_addr to;
+	struct sctp_af *af;
+	sctp_scope_t scope;
+	long timeo;
+	int err = 0;
+	int addrcnt = 0;
+	int walk_size = 0;
+	struct sockaddr *sa_addr;
+	void *addr_buf;
+
+	sp = sctp_sk(sk);
+	ep = sp->ep;
+
+	/* connect() cannot be done on a socket that is already in ESTABLISHED
+	 * state - UDP-style peeled off socket or a TCP-style socket that
+	 * is already connected.
+	 * It cannot be done even on a TCP-style listening socket.
+	 */
+	if (sctp_sstate(sk, ESTABLISHED) ||
+	    (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))) {
+		err = -EISCONN;
+		goto out_free;
+	}
+
+	/* Walk through the addrs buffer and count the number of addresses. */
+	addr_buf = kaddrs;
+	while (walk_size < addrs_size) {
+		sa_addr = (struct sockaddr *)addr_buf;
+		af = sctp_get_af_specific(sa_addr->sa_family);
+
+		/* If the address family is not supported or if this address
+		 * causes the address buffer to overflow return EINVAL.
+		 */
+		if (!af || (walk_size + af->sockaddr_len) > addrs_size) {
+			err = -EINVAL;
+			goto out_free;
+		}
+
+		err = sctp_verify_addr(sk, (union sctp_addr *)sa_addr,
+				       af->sockaddr_len);
+		if (err)
+			goto out_free;
+
+		memcpy(&to, sa_addr, af->sockaddr_len);
+		to.v4.sin_port = ntohs(to.v4.sin_port);
+
+		/* Check if there already is a matching association on the
+		 * endpoint (other than the one created here).
+		 */
+		asoc2 = sctp_endpoint_lookup_assoc(ep, &to, &transport);
+		if (asoc2 && asoc2 != asoc) {
+			if (asoc2->state >= SCTP_STATE_ESTABLISHED)
+				err = -EISCONN;
+			else
+				err = -EALREADY;
+			goto out_free;
+		}
+
+		/* If we could not find a matching association on the endpoint,
+		 * make sure that there is no peeled-off association matching
+		 * the peer address even on another socket.
+		 */
+		if (sctp_endpoint_is_peeled_off(ep, &to)) {
+			err = -EADDRNOTAVAIL;
+			goto out_free;
+		}
+
+		if (!asoc) {
+			/* If a bind() or sctp_bindx() is not called prior to
+			 * an sctp_connectx() call, the system picks an
+			 * ephemeral port and will choose an address set
+			 * equivalent to binding with a wildcard address.
+			 */
+			if (!ep->base.bind_addr.port) {
+				if (sctp_autobind(sk)) {
+					err = -EAGAIN;
+					goto out_free;
+				}
+			}
+
+			scope = sctp_scope(&to);
+			asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL);
+			if (!asoc) {
+				err = -ENOMEM;
+				goto out_free;
+			}
+		}
+
+		/* Prime the peer's transport structures.  */
+		transport = sctp_assoc_add_peer(asoc, &to, GFP_KERNEL,
+						SCTP_UNKNOWN);
+		if (!transport) {
+			err = -ENOMEM;
+			goto out_free;
+		}
+
+		addrcnt++;
+		addr_buf += af->sockaddr_len;
+		walk_size += af->sockaddr_len;
+	}
+
+	err = sctp_assoc_set_bind_addr_from_ep(asoc, GFP_KERNEL);
+	if (err < 0) {
+		goto out_free;
+	}
+
+	err = sctp_primitive_ASSOCIATE(asoc, NULL);
+	if (err < 0) {
+		goto out_free;
+	}
+
+	/* Initialize sk's dport and daddr for getpeername() */
+	inet_sk(sk)->dport = htons(asoc->peer.port);
+	af = sctp_get_af_specific(to.sa.sa_family);
+	af->to_sk_daddr(&to, sk);
+
+	timeo = sock_sndtimeo(sk, sk->sk_socket->file->f_flags & O_NONBLOCK);
+	err = sctp_wait_for_connect(asoc, &timeo);
+
+	/* Don't free association on exit. */
+	asoc = NULL;
+
+out_free:
+
+	SCTP_DEBUG_PRINTK("About to exit __sctp_connect() free asoc: %p"
+		          " kaddrs: %p err: %d\n",
+	                  asoc, kaddrs, err);
+	if (asoc)
+		sctp_association_free(asoc);
+	return err;
+}
+
+/* Helper for tunneling sctp_connectx() requests through sctp_setsockopt()
+ *
+ * API 8.9
+ * int sctp_connectx(int sd, struct sockaddr *addrs, int addrcnt);
+ *
+ * If sd is an IPv4 socket, the addresses passed must be IPv4 addresses.
+ * If the sd is an IPv6 socket, the addresses passed can either be IPv4
+ * or IPv6 addresses.
+ *
+ * A single address may be specified as INADDR_ANY or IN6ADDR_ANY, see
+ * Section 3.1.2 for this usage.
+ *
+ * addrs is a pointer to an array of one or more socket addresses. Each
+ * address is contained in its appropriate structure (i.e. struct
+ * sockaddr_in or struct sockaddr_in6) the family of the address type
+ * must be used to distengish the address length (note that this
+ * representation is termed a "packed array" of addresses). The caller
+ * specifies the number of addresses in the array with addrcnt.
+ *
+ * On success, sctp_connectx() returns 0. On failure, sctp_connectx() returns
+ * -1, and sets errno to the appropriate error code.
+ *
+ * For SCTP, the port given in each socket address must be the same, or
+ * sctp_connectx() will fail, setting errno to EINVAL.
+ *
+ * An application can use sctp_connectx to initiate an association with
+ * an endpoint that is multi-homed.  Much like sctp_bindx() this call
+ * allows a caller to specify multiple addresses at which a peer can be
+ * reached.  The way the SCTP stack uses the list of addresses to set up
+ * the association is implementation dependant.  This function only
+ * specifies that the stack will try to make use of all the addresses in
+ * the list when needed.
+ *
+ * Note that the list of addresses passed in is only used for setting up
+ * the association.  It does not necessarily equal the set of addresses
+ * the peer uses for the resulting association.  If the caller wants to
+ * find out the set of peer addresses, it must use sctp_getpaddrs() to
+ * retrieve them after the association has been set up.
+ *
+ * Basically do nothing but copying the addresses from user to kernel
+ * land and invoking either sctp_connectx(). This is used for tunneling
+ * the sctp_connectx() request through sctp_setsockopt() from userspace.
+ *
+ * We don't use copy_from_user() for optimization: we first do the
+ * sanity checks (buffer size -fast- and access check-healthy
+ * pointer); if all of those succeed, then we can alloc the memory
+ * (expensive operation) needed to copy the data to kernel. Then we do
+ * the copying without checking the user space area
+ * (__copy_from_user()).
+ *
+ * On exit there is no need to do sockfd_put(), sys_setsockopt() does
+ * it.
+ *
+ * sk        The sk of the socket
+ * addrs     The pointer to the addresses in user land
+ * addrssize Size of the addrs buffer
+ *
+ * Returns 0 if ok, <0 errno code on error.
+ */
+SCTP_STATIC int sctp_setsockopt_connectx(struct sock* sk,
+				      struct sockaddr __user *addrs,
+				      int addrs_size)
+{
+	int err = 0;
+	struct sockaddr *kaddrs;
+
+	SCTP_DEBUG_PRINTK("%s - sk %p addrs %p addrs_size %d\n",
+			  __FUNCTION__, sk, addrs, addrs_size);
+
+	if (unlikely(addrs_size <= 0))
+		return -EINVAL;
+
+	/* Check the user passed a healthy pointer.  */
+	if (unlikely(!access_ok(VERIFY_READ, addrs, addrs_size)))
+		return -EFAULT;
+
+	/* Alloc space for the address array in kernel memory.  */
+	kaddrs = (struct sockaddr *)kmalloc(addrs_size, GFP_KERNEL);
+	if (unlikely(!kaddrs))
+		return -ENOMEM;
+
+	if (__copy_from_user(kaddrs, addrs, addrs_size)) {
+		err = -EFAULT;
+	} else {
+		err = __sctp_connect(sk, kaddrs, addrs_size);
+	}
+
+	kfree(kaddrs);
 	return err;
 }
 
···
 	sp = sctp_sk(sk);
 	ep = sp->ep;
 
-	SCTP_DEBUG_PRINTK("Using endpoint: %s.\n", ep->debug_name);
+	SCTP_DEBUG_PRINTK("Using endpoint: %p.\n", ep);
 
 	/* We cannot send a message over a TCP-style listening socket. */
 	if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING)) {
···
 		}
 
 		/* Prime the peer's transport structures.  */
-		transport = sctp_assoc_add_peer(asoc, &to, GFP_KERNEL);
+		transport = sctp_assoc_add_peer(asoc, &to, GFP_KERNEL, SCTP_UNKNOWN);
 		if (!transport) {
 			err = -ENOMEM;
 			goto out_free;
···
 					       optlen, SCTP_BINDX_REM_ADDR);
 		break;
 
+	case SCTP_SOCKOPT_CONNECTX:
+		/* 'optlen' is the size of the addresses buffer. */
+		retval = sctp_setsockopt_connectx(sk, (struct sockaddr __user *)optval,
+					       optlen);
+		break;
+
 	case SCTP_DISABLE_FRAGMENTS:
 		retval = sctp_setsockopt_disable_fragments(sk, optval, optlen);
 		break;
···
  *
  * len: the size of the address.
  */
-SCTP_STATIC int sctp_connect(struct sock *sk, struct sockaddr *uaddr,
+SCTP_STATIC int sctp_connect(struct sock *sk, struct sockaddr *addr,
 			     int addr_len)
 {
-	struct sctp_sock *sp;
-	struct sctp_endpoint *ep;
-	struct sctp_association *asoc;
-	struct sctp_transport *transport;
-	union sctp_addr to;
-	struct sctp_af *af;
-	sctp_scope_t scope;
-	long timeo;
 	int err = 0;
+	struct sctp_af *af;
 
 	sctp_lock_sock(sk);
 
-	SCTP_DEBUG_PRINTK("%s - sk: %p, sockaddr: %p, addr_len: %d)\n",
-			  __FUNCTION__, sk, uaddr, addr_len);
+	SCTP_DEBUG_PRINTK("%s - sk: %p, sockaddr: %p, addr_len: %d\n",
+			  __FUNCTION__, sk, addr, addr_len);
 
-	sp = sctp_sk(sk);
-	ep = sp->ep;
-
-	/* connect() cannot be done on a socket that is already in ESTABLISHED
-	 * state - UDP-style peeled off socket or a TCP-style socket that
-	 * is already connected.
-	 * It cannot be done even on a TCP-style listening socket.
-	 */
-	if (sctp_sstate(sk, ESTABLISHED) ||
-	    (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING))) {
-		err = -EISCONN;
-		goto out_unlock;
+	/* Validate addr_len before calling common connect/connectx routine. */
+	af = sctp_get_af_specific(addr->sa_family);
+	if (!af || addr_len < af->sockaddr_len) {
+		err = -EINVAL;
+	} else {
+		/* Pass correct addr len to common routine (so it knows there
+		 * is only one address being passed.
+		 */
+		err = __sctp_connect(sk, addr, af->sockaddr_len);
 	}
 
-	err = sctp_verify_addr(sk, (union sctp_addr *)uaddr, addr_len);
-	if (err)
-		goto out_unlock;
-
-	if (addr_len > sizeof(to))
-		addr_len = sizeof(to);
-	memcpy(&to, uaddr, addr_len);
-	to.v4.sin_port = ntohs(to.v4.sin_port);
-
-	asoc = sctp_endpoint_lookup_assoc(ep, &to, &transport);
-	if (asoc) {
-		if (asoc->state >= SCTP_STATE_ESTABLISHED)
-			err = -EISCONN;
-		else
-			err = -EALREADY;
-		goto out_unlock;
-	}
-
-	/* If we could not find a matching association on the endpoint,
-	 * make sure that there is no peeled-off association matching the
-	 * peer address even on another socket.
-	 */
-	if (sctp_endpoint_is_peeled_off(ep, &to)) {
-		err = -EADDRNOTAVAIL;
-		goto out_unlock;
-	}
-
-	/* If a bind() or sctp_bindx() is not called prior to a connect()
-	 * call, the system picks an ephemeral port and will choose an address
-	 * set equivalent to binding with a wildcard address.
-	 */
-	if (!ep->base.bind_addr.port) {
-		if (sctp_autobind(sk)) {
-			err = -EAGAIN;
-			goto out_unlock;
-		}
-	}
-
-	scope = sctp_scope(&to);
-	asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL);
-	if (!asoc) {
-		err = -ENOMEM;
-		goto out_unlock;
-  	}
-
-	/* Prime the peer's transport structures.  */
-	transport = sctp_assoc_add_peer(asoc, &to, GFP_KERNEL);
-	if (!transport) {
-		sctp_association_free(asoc);
-		goto out_unlock;
-	}
-	err = sctp_assoc_set_bind_addr_from_ep(asoc, GFP_KERNEL);
-	if (err < 0) {
-		sctp_association_free(asoc);
-		goto out_unlock;
-	}
-
-	err = sctp_primitive_ASSOCIATE(asoc, NULL);
-	if (err < 0) {
-		sctp_association_free(asoc);
-		goto out_unlock;
-	}
-
-	/* Initialize sk's dport and daddr for getpeername() */
-	inet_sk(sk)->dport = htons(asoc->peer.port);
-	af = sctp_get_af_specific(to.sa.sa_family);
-	af->to_sk_daddr(&to, sk);
-
-	timeo = sock_sndtimeo(sk, sk->sk_socket->file->f_flags & O_NONBLOCK);
-	err = sctp_wait_for_connect(asoc, &timeo);
-
-out_unlock:
 	sctp_release_sock(sk);
-
 	return err;
 }
 
···
 	/* Map ipv4 address into v4-mapped-on-v6 address.  */
 	sctp_get_pf_specific(sk->sk_family)->addr_v4map(sctp_sk(sk),
 		(union sctp_addr *)&status.sstat_primary.spinfo_address);
-	status.sstat_primary.spinfo_state = transport->active;
+	status.sstat_primary.spinfo_state = transport->state;
 	status.sstat_primary.spinfo_cwnd = transport->cwnd;
 	status.sstat_primary.spinfo_srtt = transport->srtt;
 	status.sstat_primary.spinfo_rto = jiffies_to_msecs(transport->rto);
 	status.sstat_primary.spinfo_mtu = transport->pmtu;
+
+	if (status.sstat_primary.spinfo_state == SCTP_UNKNOWN)
+		status.sstat_primary.spinfo_state = SCTP_ACTIVE;
 
 	if (put_user(len, optlen)) {
 		retval = -EFAULT;
···
 		return -EINVAL;
 
 	pinfo.spinfo_assoc_id = sctp_assoc2id(transport->asoc);
-	pinfo.spinfo_state = transport->active;
+	pinfo.spinfo_state = transport->state;
 	pinfo.spinfo_cwnd = transport->cwnd;
 	pinfo.spinfo_srtt = transport->srtt;
 	pinfo.spinfo_rto = jiffies_to_msecs(transport->rto);
 	pinfo.spinfo_mtu = transport->pmtu;
+
+	if (pinfo.spinfo_state == SCTP_UNKNOWN)
+		pinfo.spinfo_state = SCTP_ACTIVE;
 
 	if (put_user(len, optlen)) {
 		retval = -EFAULT;
···
 	int retval = 0;
 	int len;
 
-	SCTP_DEBUG_PRINTK("sctp_getsockopt(sk: %p, ...)\n", sk);
+	SCTP_DEBUG_PRINTK("sctp_getsockopt(sk: %p... optname: %d)\n",
+			  sk, optname);
 
 	/* I can hardly begin to describe how wrong this is.  This is
 	 * so broken as to be worse than useless.  The API draft
···
 	return err;
 
 do_error:
-	if (asoc->counters[SCTP_COUNTER_INIT_ERROR] + 1 >=
-					 	asoc->max_init_attempts)
+	if (asoc->init_err_counter + 1 >= asoc->max_init_attempts)
 		err = -ETIMEDOUT;
 	else
 		err = -ECONNREFUSED;

net/sctp/transport.c

···
 	peer->last_time_used = jiffies;
 	peer->last_time_ecne_reduced = jiffies;
 
-	peer->active = SCTP_ACTIVE;
+	peer->init_sent_count = 0;
+
+	peer->state = SCTP_ACTIVE;
 	peer->hb_allowed = 0;
 
 	/* Initialize the default path max_retrans.  */