[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>

6 files changed, 62 insertions, 22 deletions

diff --git a/include/net/sctp/command.h b/include/net/sctp/command.h
index ebc5282e6d58..dc107ffad483 100644
--- a/include/net/sctp/command.h
+++ b/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)
diff --git a/include/net/sctp/constants.h b/include/net/sctp/constants.h
index 2b76c0f4babc..4868c7f7749d 100644
--- a/include/net/sctp/constants.h
+++ b/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 */
diff --git a/include/net/sctp/sctp.h b/include/net/sctp/sctp.h
index 960abfa48d68..ef2738159ab3 100644
--- a/include/net/sctp/sctp.h
+++ b/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)
diff --git a/include/net/sctp/sm.h b/include/net/sctp/sm.h
index f4fcee104707..a53e08a45e32 100644
--- a/include/net/sctp/sm.h
+++ b/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. */
 
diff --git a/include/net/sctp/structs.h b/include/net/sctp/structs.h
index 6c24d9cd3d66..dfad4d3c581c 100644
--- a/include/net/sctp/structs.h
+++ b/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);
diff --git a/include/net/sctp/user.h b/include/net/sctp/user.h
index 2758e8ce4f25..f6328aeddcce 100644
--- a/include/net/sctp/user.h
+++ b/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 */
 };
 
 /*