int uip_backlogdestroy(FAR struct uip_conn *conn)
{
FAR struct uip_backlog_s *blg;
FAR struct uip_blcontainer_s *blc;
FAR struct uip_conn *blconn;
nllvdbg("conn=%p\n", conn);
#ifdef CONFIG_DEBUG
if (!conn)
{
return -EINVAL;
}
#endif
/* Make sure that the connection has a backlog to be destroyed */
if (conn->backlog)
{
/* Remove the backlog structure reference from the connection */
blg = conn->backlog;
conn->backlog = NULL;
/* Handle any pending connections in the backlog */
while ((blc = (FAR struct uip_blcontainer_s*)sq_remfirst(&blg->bl_pending)) != NULL)
{
blconn = blc->bc_conn;
if (blconn)
{
/* REVISIT -- such connections really need to be gracefully closed */
blconn->blparent = NULL;
blconn->backlog = NULL;
blconn->crefs = 0;
uip_tcpfree(blconn);
}
}
/* Then free the entire backlog structure */
kfree(blg);
}
return OK;
}
struct uip_conn *uip_tcpalloc(void)
{
struct uip_conn *conn;
uip_lock_t flags;
/* Because this routine is called from both interrupt level and
* and from user level, we have not option but to disable interrupts
* while accessing g_free_tcp_connections[];
*/
flags = uip_lock();
/* Return the entry from the head of the free list */
conn = (struct uip_conn *)dq_remfirst(&g_free_tcp_connections);
/* Is the free list empty? */
if (!conn)
{
/* As a fallback, check for connection structures which are not
* established yet.
*
* Search the active connection list for the oldest connection
* that is not in the UIP_ESTABLISHED state.
*/
struct uip_conn *tmp = g_active_tcp_connections.head;
while (tmp)
{
nllvdbg("conn: %p state: %02x\n", tmp, tmp->tcpstateflags);
/* Is this connection in some state other than UIP_ESTABLISHED
* state?
*/
if (tmp->tcpstateflags != UIP_ESTABLISHED)
{
/* Yes.. Is it the oldest one we have seen so far? */
if (!conn || tmp->timer > conn->timer)
{
/* Yes.. remember it */
conn = tmp;
}
}
/* Look at the next active connection */
tmp = tmp->node.flink;
}
/* Did we find a connection that we can re-use? */
if (conn != NULL)
{
nlldbg("Closing unestablished connection: %p\n", conn);
/* Yes... free it. This will remove the connection from the list
* of active connections and release all resources held by the
* connection.
*
* REVISIT: Could there be any higher level, socket interface
* that needs to be informed that we did this to them?
*/
uip_tcpfree(conn);
/* Now there is guaranteed to be one free connection. Get it! */
conn = (struct uip_conn *)dq_remfirst(&g_free_tcp_connections);
}
}
uip_unlock(flags);
/* Mark the connection allocated */
if (conn)
{
memset(conn, 0, sizeof(struct uip_conn));
conn->tcpstateflags = UIP_ALLOCATED;
}
return conn;
}
int psock_close(FAR struct socket *psock)
{
int err;
/* Verify that the sockfd corresponds to valid, allocated socket */
if (!psock || psock->s_crefs <= 0)
{
err = EBADF;
goto errout;
}
/* We perform the uIP close operation only if this is the last count on the socket.
* (actually, I think the socket crefs only takes the values 0 and 1 right now).
*/
if (psock->s_crefs <= 1)
{
/* Perform uIP side of the close depending on the protocol type */
switch (psock->s_type)
{
#ifdef CONFIG_NET_TCP
case SOCK_STREAM:
{
struct uip_conn *conn = psock->s_conn;
/* Is this the last reference to the connection structure (there
* could be more if the socket was dup'ed.
*/
if (conn->crefs <= 1)
{
/* Yes... free the connection structure */
uip_unlisten(conn); /* No longer accepting connections */
netclose_disconnect(psock); /* Break any current connections */
conn->crefs = 0; /* No more references on the connection */
uip_tcpfree(conn); /* Free uIP resources */
}
else
{
/* No.. Just decrement the reference count */
conn->crefs--;
}
}
break;
#endif
#ifdef CONFIG_NET_UDP
case SOCK_DGRAM:
{
struct uip_udp_conn *conn = psock->s_conn;
/* Is this the last reference to the connection structure (there
* could be more if the socket was dup'ed.
*/
if (conn->crefs <= 1)
{
/* Yes... free the connection structure */
conn->crefs = 0; /* No more references on the connection */
uip_udpfree(psock->s_conn); /* Free uIP resources */
}
else
{
/* No.. Just decrement the reference count */
conn->crefs--;
}
}
break;
#endif
default:
err = EBADF;
goto errout;
}
}
/* Then release our reference on the socket structure containing the connection */
sock_release(psock);
return OK;
errout:
errno = err;
return ERROR;
}
