SCTP: API to delete a sub-connection

[vpp.git] / src / vnet / sctp / sctp.h

diff --git a/src/vnet/sctp/sctp.h b/src/vnet/sctp/sctp.h
index fd9d8da..9f17e53 100644 (file)
--- a/src/vnet/sctp/sctp.h
+++ b/src/vnet/sctp/sctp.h
@@ -100,8 +100,8 @@ enum _sctp_subconn_state
 typedef struct _sctp_sub_connection
 {
   transport_connection_t connection;         /**< Common transport data. First! */
-  void *parent;                                                                /**< Link to the parent-super connection */
 
+  u8 subconn_idx; /**< This indicates the position of this sub-connection in the super-set container of connections pool */
   u32 error_count; /**< The current error count for this destination. */
   u32 error_threshold; /**< Current error threshold for this destination,
                                i.e. what value marks the destination down if error count reaches this value. */
@@ -235,17 +235,33 @@ typedef struct _sctp_connection
 
   sctp_options_t snd_opts;
 
-  u8 next_avail_sub_conn; /**< Represent the index of the next free slot in sub_conn */
+  u8 forming_association_changed; /**< This is a flag indicating whether the original association has been modified during
+                                 the life-span of the association itself. For instance, a new sub-connection might have been added. */
 
 } sctp_connection_t;
 
 typedef void (sctp_timer_expiration_handler) (u32 conn_index, u32 timer_id);
 
 sctp_connection_t *sctp_connection_new (u8 thread_index);
-void sctp_sub_connection_add_ip4 (u8 thread_index,
-                                 sctp_ipv4_addr_param_t * ipv4_addr);
-void sctp_sub_connection_add_ip6 (u8 thread_index,
-                                 sctp_ipv6_addr_param_t * ipv6_addr);
+
+u8
+sctp_sub_connection_add_ip4 (vlib_main_t * vm,
+                            ip4_address_t * lcl_addr,
+                            ip4_address_t * rmt_addr);
+
+u8
+sctp_sub_connection_add_ip6 (vlib_main_t * vm,
+                            ip6_address_t * lcl_addr,
+                            ip6_address_t * rmt_addr);
+
+u8
+sctp_sub_connection_del_ip4 (ip4_address_t * lcl_addr,
+                            ip4_address_t * rmt_addr);
+
+u8
+sctp_sub_connection_del_ip6 (ip6_address_t * lcl_addr,
+                            ip6_address_t * rmt_addr);
+
 void sctp_connection_close (sctp_connection_t * sctp_conn);
 void sctp_connection_cleanup (sctp_connection_t * sctp_conn);
 void sctp_connection_del (sctp_connection_t * sctp_conn);
@@ -280,6 +296,18 @@ void sctp_init_mss (sctp_connection_t * sctp_conn);
 void sctp_prepare_initack_chunk (sctp_connection_t * sctp_conn, u8 idx,
                                 vlib_buffer_t * b, ip4_address_t * ip4_addr,
                                 ip6_address_t * ip6_addr);
+void
+sctp_prepare_initack_chunk_for_collision (sctp_connection_t * sctp_conn,
+                                         u8 idx, vlib_buffer_t * b,
+                                         ip4_address_t * ip4_addr,
+                                         ip6_address_t * ip6_addr);
+void sctp_prepare_abort_for_collision (sctp_connection_t * sctp_conn, u8 idx,
+                                      vlib_buffer_t * b,
+                                      ip4_address_t * ip4_addr,
+                                      ip6_address_t * ip6_addr);
+void
+sctp_prepare_operation_error (sctp_connection_t * sctp_conn, u8 idx,
+                             vlib_buffer_t * b, u8 err_cause);
 void sctp_prepare_cookie_echo_chunk (sctp_connection_t * sctp_conn, u8 idx,
                                     vlib_buffer_t * b,
                                     sctp_state_cookie_param_t * sc);
@@ -292,6 +320,8 @@ void sctp_prepare_heartbeat_ack_chunk (sctp_connection_t * sctp_conn, u8 idx,
 
 u16 sctp_check_outstanding_data_chunks (sctp_connection_t * sctp_conn);
 
+void sctp_api_reference (void);
+
 #define IP_PROTOCOL_SCTP       132
 
 /** SSCTP FSM state definitions as per RFC4960. */
@@ -512,7 +542,7 @@ sctp_half_open_connection_get (u32 conn_index)
   clib_spinlock_lock_if_init (&sctp_main.half_open_lock);
   if (!pool_is_free_index (sctp_main.half_open_connections, conn_index))
     tc = pool_elt_at_index (sctp_main.half_open_connections, conn_index);
-  tc->sub_conn[MAIN_SCTP_SUB_CONN_IDX].parent = tc;
+  tc->sub_conn[MAIN_SCTP_SUB_CONN_IDX].subconn_idx = MAIN_SCTP_SUB_CONN_IDX;
   clib_spinlock_unlock_if_init (&sctp_main.half_open_lock);
   return tc;
 }
@@ -609,7 +639,11 @@ sctp_get_connection_from_transport (transport_connection_t * tconn)
   if (sub->parent == NULL)
     SCTP_ADV_DBG ("sub->parent == NULL");
 #endif
-  return (sctp_connection_t *) sub->parent;
+  if (sub->subconn_idx > 0)
+    return (sctp_connection_t *) sub -
+      (sizeof (sctp_sub_connection_t) * (sub->subconn_idx - 1));
+
+  return (sctp_connection_t *) sub;
 }
 
 always_inline u32
@@ -811,6 +845,19 @@ vlib_buffer_push_sctp (vlib_buffer_t * b, u16 sp_net, u16 dp_net,
                                          sctp_hdr_opts_len);
 }
 
+always_inline u8
+sctp_next_avail_subconn (sctp_connection_t * sctp_conn)
+{
+  u8 i;
+
+  for (i = 0; i < MAX_SCTP_CONNECTIONS; i++)
+    {
+      if (sctp_conn->sub_conn[i].state == SCTP_SUBCONN_STATE_DOWN)
+       return i;
+    }
+  return MAX_SCTP_CONNECTIONS;
+}
+
 always_inline void
 update_smallest_pmtu_idx (sctp_connection_t * sctp_conn)
 {