+always_inline void
+nat44_delete_session(snat_main_t * sm, snat_session_t * ses, u32 thread_index)
+{
+ snat_main_per_thread_data_t *tsm = vec_elt_at_index (sm->per_thread_data,
+ thread_index);
+ clib_bihash_kv_8_8_t kv, value;
+ snat_user_key_t u_key;
+ snat_user_t *u;
+ u_key.addr = ses->in2out.addr;
+ u_key.fib_index = ses->in2out.fib_index;
+ kv.key = u_key.as_u64;
+ if (!clib_bihash_search_8_8 (&tsm->user_hash, &kv, &value))
+ {
+ u = pool_elt_at_index (tsm->users, value.value);
+ if (snat_is_session_static(ses))
+ u->nstaticsessions--;
+ else
+ u->nsessions--;
+ }
+ clib_dlist_remove (tsm->list_pool, ses->per_user_index);
+ pool_put_index (tsm->list_pool, ses->per_user_index);
+ pool_put (tsm->sessions, ses);
+}
+
+/** \brief Set TCP session state.
+ @return 1 if session was closed, otherwise 0
+*/
+always_inline int
+nat44_set_tcp_session_state_i2o(snat_main_t * sm, snat_session_t * ses,
+ tcp_header_t * tcp, u32 thread_index)
+{
+ if (tcp->flags & TCP_FLAG_FIN)
+ {
+ ses->i2o_fin_seq = clib_net_to_host_u32 (tcp->seq_number);
+ ses->state |= NAT44_SES_I2O_FIN;
+ }
+ if ((tcp->flags & TCP_FLAG_ACK) && (ses->state & NAT44_SES_O2I_FIN))
+ {
+ if (clib_net_to_host_u32 (tcp->ack_number) > ses->o2i_fin_seq)
+ ses->state |= NAT44_SES_O2I_FIN_ACK;
+ }
+ if (nat44_is_ses_closed (ses))
+ {
+ nat_free_session_data (sm, ses, thread_index);
+ nat44_delete_session (sm, ses, thread_index);
+ return 1;
+ }
+ return 0;
+}
+
+always_inline int
+nat44_set_tcp_session_state_o2i(snat_main_t * sm, snat_session_t * ses,
+ tcp_header_t * tcp, u32 thread_index)
+{
+ if (tcp->flags & TCP_FLAG_FIN)
+ {
+ ses->o2i_fin_seq = clib_net_to_host_u32 (tcp->seq_number);
+ ses->state |= NAT44_SES_O2I_FIN;
+ }
+ if ((tcp->flags & TCP_FLAG_ACK) && (ses->state & NAT44_SES_I2O_FIN))
+ {
+ if (clib_net_to_host_u32 (tcp->ack_number) > ses->i2o_fin_seq)
+ ses->state |= NAT44_SES_I2O_FIN_ACK;
+ }
+ if (nat44_is_ses_closed (ses))
+ {
+ nat_free_session_data (sm, ses, thread_index);
+ nat44_delete_session (sm, ses, thread_index);
+ return 1;
+ }
+ return 0;
+}
+