44d88abb83
There are two issues with it however:
1. Reading from file system on a per packet basis could be slow. I think it probably should have a small, in-memory cache of most frequently used routes for good problem.
2. Currently the delroute logic is disabled due to a problem with the design. NuttX does not currently support truncate(). Therefore, it is not possible to delete entries from the routing table file.
In this current implementation, that leaves the last entry intact at the end of the file. An alternative design might include a tag on each record to indicate if the record is valid or not. That would work but would add complexity to the other routing table functions.
The existing implementation is available for testing purposes only if CONFIG_EXPERIMENTAL=y.
Squashed commit of the following:
net/route: The current delroute design depends on file truncation. However, NuttX does not currently support truncate. Alternative, more complex designs are possible but not implemented. At present the file routing table are otherwise functional but the delroute logic is disabled via CONFIG_EXPERIMENTAL. Enable it only if you plan to fix it.
net/route: Fix some issues with locking routing table files.
net/route: Add partial implementation of delroute for the case where the routing table is in a file.
net/route: Add support for seeking to positions in the routing table.
net/route: Add net_addroute_ipv4/6() using a file-based routing table.
net/route: Add net_foreach_ipv4/4() using a file-based routing table.
net/route: Initial build, configuration, and fs utilies to support routing tables in a file.
136 lines
4.4 KiB
C
136 lines
4.4 KiB
C
/****************************************************************************
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* net/route/net_foreach_ramroute.c
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*
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* Copyright (C) 2013, 2017 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <stdint.h>
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#include <errno.h>
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#include <nuttx/net/net.h>
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#include <arch/irq.h>
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#include "route/ramroute.h"
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#include "route/route.h"
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#if defined(CONFIG_ROUTE_IPv4_RAMROUTE) || defined(CONFIG_ROUTE_IPv6_RAMROUTE)
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: net_foreachroute_ipv4 and net_foreachroute_ipv6
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*
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* Description:
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* Traverse the routing table
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*
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* Parameters:
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* handler - Will be called for each route in the routing table.
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* arg - An arbitrary value that will be passed tot he handler.
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*
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* Returned Value:
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* Zero (OK) returned if the entire table was search. A negated errno
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* value will be returned in the event of a failure. Handlers may also
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* terminate the search early with any non-zero, non-negative value.
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*
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****************************************************************************/
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#ifdef CONFIG_ROUTE_IPv4_RAMROUTE
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int net_foreachroute_ipv4(route_handler_t handler, FAR void *arg)
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{
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FAR struct net_route_ipv4_entry_s *route;
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FAR struct net_route_ipv4_entry_s *next;
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int ret = 0;
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/* Prevent concurrent access to the routing table */
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net_lock();
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/* Visit each entry in the routing table */
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for (route = g_ipv4_routes.head; ret == 0 && route != NULL; route = next)
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{
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/* Get the next entry in the to visit. We do this BEFORE calling the
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* handler because the hanlder may delete this entry.
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*/
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next = route->flink;
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ret = handler(&route->entry, arg);
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}
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/* Unlock the network */
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net_unlock();
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return ret;
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}
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#endif
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#ifdef CONFIG_ROUTE_IPv6_RAMROUTE
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int net_foreachroute_ipv6(route_handler_ipv6_t handler, FAR void *arg)
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{
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FAR struct net_route_ipv6_entry_s *route;
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FAR struct net_route_ipv6_entry_s *next;
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int ret = 0;
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/* Prevent concurrent access to the routing table */
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net_lock();
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/* Visit each entry in the routing table */
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for (route = g_ipv6_routes.head; ret == 0 && route != NULL; route = next)
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{
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/* Get the next entry in the to visit. We do this BEFORE calling the
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* handler because the hanlder may delete this entry.
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*/
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next = route->flink;
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ret = handler(&route->entry, arg);
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}
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/* Unlock the network */
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net_unlock();
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return ret;
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}
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#endif
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#endif /* CONFIG_ROUTE_IPv4_RAMROUTE || CONFIG_ROUTE_IPv6_RAMROUTE */
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