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| -rw-r--r-- | nuttx/net/net_allocroute.c | 174 |
1 files changed, 174 insertions, 0 deletions
diff --git a/nuttx/net/net_allocroute.c b/nuttx/net/net_allocroute.c new file mode 100644 index 000000000..eaa94eee7 --- /dev/null +++ b/nuttx/net/net_allocroute.c @@ -0,0 +1,174 @@ +/**************************************************************************** + * net/net_allocroute.c + * + * Copyright (C) 2013 Gregory Nutt. All rights reserved. + * Author: Gregory Nutt <gnutt@nuttx.org> + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * 3. Neither the name NuttX nor the names of its contributors may be + * used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS + * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE + * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, + * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS + * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED + * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN + * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + * + ****************************************************************************/ + +/**************************************************************************** + * Included Files + ****************************************************************************/ + +#include <nuttx/config.h> + +#include <stdint.h> +#include <errno.h> + +#include <arch/irq.h> + +#include "net_internal.h" +#include "net_route.h" + +#if defined(CONFIG_NET) && defined(CONFIG_NET_ROUTE) + +/**************************************************************************** + * Public Data + ****************************************************************************/ + +/* This is the routing table */ + +sq_queue_t g_routes; + +/**************************************************************************** + * Private Data + ****************************************************************************/ + +/* This is a list of free routing table entries */ + +static sq_queue_t g_freeroutes; + +/* This is an array of pre-allocated network routes */ + +static struct net_route_s g_preallocroutes[CONFIG_NET_MAXROUTES]; + +/**************************************************************************** + * Public Functions + ****************************************************************************/ + +/**************************************************************************** + * Function: net_initroute + * + * Description: + * Initialize to the routing table + * + * Parameters: + * None + * + * Returned Value: + * None + * + * Assumptions: + * Called early in initialization so that no special protection is needed. + * + ****************************************************************************/ + +void net_initroute(void) +{ + int i; + + /* Initialize the routing table and the free list */ + + sq_init(&g_routes); + sq_init(&g_freeroutes); + + /* All all of the pre-allocated routing table entries to a free list */ + + for (i = 0; i < CONFIG_NET_MAXROUTES; i++) + { + sq_addlast((FAR sq_entry_t *)&g_preallocroutes[i], + (FAR sq_queue_t *)&g_freeroutes); + } +} + +/**************************************************************************** + * Function: net_allocroute + * + * Description: + * Allocate one route by removing it from the free list + * + * Parameters: + * None + * + * Returned Value: + * On success, a pointer to the newly allocated route table entry is + * returned; NULL is returned on failure. + * + ****************************************************************************/ + +FAR struct net_route_s *net_allocroute(void) +{ + FAR struct net_route_s *route; + uip_lock_t save; + + /* Get exclusive address to the networking data structures */ + + save = uip_lock(); + + /* Then add the new entry to the table */ + + route = (FAR struct net_route_s *) + sq_remfirst((FAR sq_queue_t *)&g_freeroutes); + + uip_unlock(save); + return route; +} + +/**************************************************************************** + * Function: net_allocroute + * + * Description: + * Free one route by adding it from the free list + * + * Parameters: + * route - The route to be freed + * + * Returned Value: + * None + * + ****************************************************************************/ + +void net_freeroute(FAR struct net_route_s *route) +{ + uip_lock_t save; + + DEBUGASSERT(route); + + /* Get exclusive address to the networking data structures */ + + save = uip_lock(); + + /* Then add the new entry to the table */ + + sq_addlast((FAR sq_entry_t *)route, (FAR sq_queue_t *)&g_freeroutes); + uip_unlock(save); +} + +#endif /* CONFIG_NET && CONFIG_NET_ROUTE */ |