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nuttx/net/route/net_del_fileroute.c

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/****************************************************************************
* net/route/net_del_fileroute.c
*
* Copyright (C) 2017-2018 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 <unistd.h>
#include <fcntl.h>
#include <string.h>
#include <errno.h>
#include <debug.h>
#include <arpa/inet.h>
#include <nuttx/fs/fs.h>
#include <nuttx/net/ip.h>
#include "route/fileroute.h"
#include "route/cacheroute.h"
#include "route/route.h"
#if defined(CONFIG_ROUTE_IPv4_FILEROUTE) || defined(CONFIG_ROUTE_IPv6_FILEROUTE)
/****************************************************************************
* Public Types
****************************************************************************/
#ifdef CONFIG_ROUTE_IPv4_FILEROUTE
struct route_match_ipv4_s
{
in_addr_t target; /* The target IP address to match */
in_addr_t netmask; /* The network mask to match */
unsigned int index; /* Index of match */
};
#endif
#ifdef CONFIG_ROUTE_IPv6_FILEROUTE
struct route_match_ipv6_s
{
net_ipv6addr_t target; /* The target IP address to match */
net_ipv6addr_t netmask; /* The network mask to match */
unsigned int index; /* Index of match */
};
#endif
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: net_match_ipv4
*
* Description:
* Return 1 if the route is available
*
* Parameters:
* route - The next route to examine
* arg - The match values (cast to void*)
*
* Returned Value:
* 0 if the entry is not a match; 1 if the entry matched and was cleared.
*
****************************************************************************/
#ifdef CONFIG_ROUTE_IPv4_FILEROUTE
static int net_match_ipv4(FAR struct net_route_ipv4_s *route, FAR void *arg)
{
FAR struct route_match_ipv4_s *match = (FAR struct route_match_ipv4_s *)arg;
/* To match, the masked target address must be the same, and the masks
* must be the same.
*/
net_ipv4_dumproute("Comparing", route);
ninfo("With:\n");
ninfo(" target=%08lx netmask=%08lx\n",
htonl(match->target), htonl(match->netmask));
if (net_ipv4addr_maskcmp(route->target, match->target, match->netmask) &&
net_ipv4addr_cmp(route->netmask, match->netmask))
{
/* They match.. a non-zero value to terminate the traversal. The last
* value of index is the index to the matching entry.
*/
return 1;
}
/* Next time we are here, this will be the routing table index */
match->index++;
return 0;
}
#endif
#ifdef CONFIG_ROUTE_IPv6_FILEROUTE
static int net_match_ipv6(FAR struct net_route_ipv6_s *route, FAR void *arg)
{
FAR struct route_match_ipv6_s *match = (FAR struct route_match_ipv6_s *)arg;
/* To match, the masked target address must be the same, and the masks
* must be the same.
*/
net_ipv6_dumproute("Comparing", route);
ninfo("With:\n");
ninfo(" target: %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
htons(match->target[0]), htons(match->target[1]),
htons(match->target[2]), htons(match->target[3]),
htons(match->target[4]), htons(match->target[5]),
htons(match->target[6]), htons(match->target[7]));
ninfo(" netmask: %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
htons(match->netmask[0]), htons(match->netmask[1]),
htons(match->netmask[2]), htons(match->netmask[3]),
htons(match->netmask[4]), htons(match->netmask[5]),
htons(match->netmask[6]), htons(match->netmask[7]));
if (net_ipv6addr_maskcmp(route->target, match->target, match->netmask) &&
net_ipv6addr_cmp(route->netmask, match->netmask))
{
/* They match.. a non-zero value to terminate the traversal. The last
* value of index is the index to the matching entry.
*/
return 1;
}
/* Next time we are here, this will be the routing table index */
match->index++;
return 0;
}
#endif
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: net_delroute_ipv4 and net_delroute_ipv6
*
* Description:
* Remove an existing route from the routing table
*
* Parameters:
*
* Returned Value:
* OK on success; Negated errno on failure.
*
****************************************************************************/
#ifdef CONFIG_ROUTE_IPv4_FILEROUTE
int net_delroute_ipv4(in_addr_t target, in_addr_t netmask)
{
struct route_match_ipv4_s match;
struct net_route_ipv4_s route;
struct file fshandle;
off_t filesize;
ssize_t nwritten;
ssize_t nread;
off_t pos;
int nentries;
int index;
int ret;
/* We must lock out other accesses to the routing table while we remove
* entry
*/
ret = net_lockroute_ipv4();
if (ret < 0)
{
nerr("ERROR: net_lockroute_ipv4 failed: %d\n", ret);
return ret;
}
/* Get the size of the routing table (in entries) */
nentries = net_routesize_ipv4();
if (nentries < 0)
{
ret = nentries;
goto errout_with_lock;
}
else if (nentries == 0)
{
ret = -ENOENT;
goto errout_with_lock;
}
/* Set up the comparison structure */
net_ipv4addr_copy(match.target, target);
net_ipv4addr_copy(match.netmask, netmask);
match.index = 0;
/* Then find the index into the routing table where the match can be found */
ret = net_foreachroute_ipv4(net_match_ipv4, &match);
if (ret < 0)
{
/* And error occurred */
goto errout_with_lock;
}
else if (ret == 0)
{
/* No match found */
ret = -ENOENT;
goto errout_with_lock;
}
/* Open the routing table for read/write access */
ret = net_openroute_ipv4(O_RDWR, &fshandle);
if (ret < 0)
{
nerr("ERROR: Could not open IPv4 routing table: %d\n", ret);
goto errout_with_lock;
}
#ifdef CONFIG_ROUTE_IPv4_CACHEROUTE
/* We are committed to modifying the routing table. Flush the in-memory
* routing table cache.
*/
net_flushcache_ipv4();
#endif
/* Loop, copying each entry, to the previous entry thus removing the entry
* to be deleted.
*/
for (index = match.index + 1; index < nentries; index++)
{
/* Seek to the current entry to be moved */
pos = net_seekroute_ipv4(&fshandle, index);
if (pos < 0)
{
nerr("ERROR: net_readroute_ipv4 failed: %ld\n", (long)pos);
ret =(int)pos;
goto errout_with_fshandle;
}
/* Read the routing table entry at this position */
nread = net_readroute_ipv4(&fshandle, &route);
if (nread < 0)
{
nerr("ERROR: net_readroute_ipv4 failed: %ld\n", (long)nread);
ret = (int)nread;
goto errout_with_fshandle;
}
else if (nread == 0)
{
nerr("ERROR: Unexpected end of file\n");
ret = -EINVAL;
goto errout_with_fshandle;
}
/* Seek to the previous entry to be replaced */
pos = net_seekroute_ipv4(&fshandle, index - 1);
if (pos < 0)
{
nerr("ERROR: net_readroute_ipv4 failed: %ld\n", (long)pos);
ret =(int)pos;
goto errout_with_fshandle;
}
/* Now write the record to its new location */
nwritten = net_writeroute_ipv4(&fshandle, &route);
if (nwritten < 0)
{
nerr("ERROR: net_readroute_ipv4 failed: %ld\n", (long)nwritten);
ret = (int)nwritten;
goto errout_with_fshandle;
}
}
/* Now truncate the one duplicate entry at the end of the file. This may
* result in a zero length file.
*/
filesize = (nentries - 1) * sizeof(struct net_route_ipv4_s);
ret = file_truncate(&fshandle, filesize);
errout_with_fshandle:
(void)net_closeroute_ipv4(&fshandle);
errout_with_lock:
(void)net_unlockroute_ipv4();
return ret;
}
#endif
#ifdef CONFIG_ROUTE_IPv6_FILEROUTE
int net_delroute_ipv6(net_ipv6addr_t target, net_ipv6addr_t netmask)
{
struct route_match_ipv6_s match;
struct net_route_ipv6_s route;
struct file fshandle;
off_t filesize;
ssize_t nwritten;
ssize_t nread;
off_t pos;
int nentries;
int index;
int ret;
/* We must lock out other accesses to the routing table while we remove
* entry
*/
ret = net_lockroute_ipv6();
if (ret < 0)
{
nerr("ERROR: net_lockroute_ipv6 failed: %d\n", ret);
return ret;
}
/* Get the size of the routing table (in entries) */
nentries = net_routesize_ipv6();
if (nentries < 0)
{
ret = nentries;
goto errout_with_lock;
}
else if (nentries == 0)
{
ret = -ENOENT;
goto errout_with_lock;
}
/* Set up the comparison structure */
net_ipv6addr_copy(match.target, target);
net_ipv6addr_copy(match.netmask, netmask);
match.index = 0;
/* Then find the index into the routing table where the match can be found */
ret = net_foreachroute_ipv6(net_match_ipv6, &match);
if (ret < 0)
{
/* And error occurred */
ret = ret;
goto errout_with_lock;
}
else if (ret == 0)
{
/* No match found */
ret = -ENOENT;
goto errout_with_lock;
}
/* Open the routing table for read/write access */
ret = net_openroute_ipv6(O_RDWR, &fshandle);
if (ret < 0)
{
nerr("ERROR: Could not open IPv6 routing table: %d\n", ret);
goto errout_with_lock;
}
#ifdef CONFIG_ROUTE_IPv6_CACHEROUTE
/* We are committed to modifying the routing table. Flush the in-memory
* routing table cache.
*/
net_flushcache_ipv6();
#endif
/* Loop, copying each entry, to the previous entry thus removing the entry
* to be deleted.
*/
for (index = match.index + 1; index < nentries; index++)
{
/* Seek to the current entry to be moved */
pos = net_seekroute_ipv6(&fshandle, index);
if (pos < 0)
{
nerr("ERROR: net_readroute_ipv6 failed: %ld\n", (long)pos);
ret =(int)pos;
goto errout_with_fshandle;
}
/* Read the routing table entry at this position */
nread = net_readroute_ipv6(&fshandle, &route);
if (nread < 0)
{
nerr("ERROR: net_readroute_ipv6 failed: %ld\n", (long)nread);
ret = (int)nread;
goto errout_with_fshandle;
}
else if (nread == 0)
{
nerr("ERROR: Unexpected end of file\n");
ret = -EINVAL;
goto errout_with_fshandle;
}
/* Seek to the previous entry to be replaced */
pos = net_seekroute_ipv6(&fshandle, index - 1);
if (pos < 0)
{
nerr("ERROR: net_readroute_ipv6 failed: %ld\n", (long)pos);
ret =(int)pos;
goto errout_with_fshandle;
}
/* Now write the record to its new location */
nwritten = net_writeroute_ipv6(&fshandle, &route);
if (nwritten < 0)
{
nerr("ERROR: net_readroute_ipv6 failed: %ld\n", (long)nwritten);
ret = (int)nwritten;
goto errout_with_fshandle;
}
}
/* Now truncate the one duplicate entry at the end of the file. This may
* result in a zero length file.
*/
filesize = (nentries - 1) * sizeof(struct net_route_ipv6_s);
ret = file_truncate(&fshandle, filesize);
errout_with_fshandle:
(void)net_closeroute_ipv6(&fshandle);
errout_with_lock:
(void)net_unlockroute_ipv6();
return ret;
}
#endif
#endif /* CONFIG_ROUTE_IPv4_FILEROUTE || CONFIG_ROUTE_IPv6_FILEROUTE */
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