[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 <ffilzlnx@us.ibm.com>
Signed-off-by: Sridhar Samudrala <sri@us.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/sctp/command.h

@@ -65,9 +65,11 @@ typedef enum {
 	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.  */
@@ -118,7 +120,6 @@ typedef union {
 	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;
@@ -165,7 +166,6 @@ SCTP_ARG_CONSTRUCTOR(U16,	__u16, u16)
 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

@@ -263,13 +263,6 @@ enum { SCTP_MIN_PMTU = 576 };
 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

@@ -223,6 +223,22 @@ DECLARE_SNMP_STAT(struct sctp_mib, sctp_statistics);
 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; }
 
@@ -236,6 +252,7 @@ extern int sctp_debug_flag;
 #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

@@ -116,7 +116,8 @@ sctp_state_fn_t sctp_sf_eat_data_fast_4_4;
 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;
@@ -258,7 +259,10 @@ struct sctp_chunk *sctp_make_fwdtsn(const struct sctp_association *asoc,
 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

@@ -867,10 +867,13 @@ struct sctp_transport {
 	 */
 	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.
@@ -1222,9 +1225,6 @@ struct sctp_endpoint {
 
 	/* sendbuf acct. policy.	*/
 	__u32 sndbuf_policy;
-
-	/* Name for debugging output... */
-	char *debug_name;
 };
 
 /* Recover the outter endpoint structure. */
@@ -1314,11 +1314,23 @@ struct sctp_association {
 		 *	       : 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.
 		 */
@@ -1486,6 +1498,9 @@ struct sctp_association {
 	/* 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
@@ -1549,8 +1564,11 @@ struct sctp_association {
 	/* 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;
@@ -1708,6 +1726,8 @@ 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 *);
 void sctp_assoc_update_retran_path(struct sctp_association *);
@@ -1717,9 +1737,12 @@ int sctp_assoc_lookup_laddr(struct sctp_association *asoc,
 			    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

@@ -111,6 +111,8 @@ enum sctp_optname {
 #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
 };
 
 /*
@@ -527,6 +529,7 @@ struct sctp_paddrinfo {
 enum sctp_spinfo_state {
 	SCTP_INACTIVE,
 	SCTP_ACTIVE,
+	SCTP_UNKNOWN = 0xffff  /* Value used for transport state unknown */
 };
 
 /*