nuttx/net/route/net_del_ramroute.c

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/****************************************************************************
* net/route/net_del_ramroute.c
*
* SPDX-License-Identifier: Apache-2.0
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <stdint.h>
#include <string.h>
#include <errno.h>
#include <debug.h>
#include <arpa/inet.h>
#include <nuttx/net/ip.h>
#include "netlink/netlink.h"
#include "route/ramroute.h"
#include "route/route.h"
#if defined(CONFIG_ROUTE_IPv4_RAMROUTE) || defined(CONFIG_ROUTE_IPv6_RAMROUTE)
/****************************************************************************
* Private Types
****************************************************************************/
#ifdef CONFIG_ROUTE_IPv4_RAMROUTE
This commit adds support for routing tables in files in a file system. This might be useful for customized, per-unit routing tables. 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.
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struct route_match_ipv4_s
{
FAR struct net_route_ipv4_s *prev; /* Predecessor in the list */
This commit adds support for routing tables in files in a file system. This might be useful for customized, per-unit routing tables. 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.
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in_addr_t target; /* The target IP address to match */
in_addr_t netmask; /* The network mask to match */
};
#endif
#ifdef CONFIG_ROUTE_IPv6_RAMROUTE
struct route_match_ipv6_s
{
FAR struct net_route_ipv6_s *prev; /* Predecessor in the list */
net_ipv6addr_t target; /* The target IP address to match */
net_ipv6addr_t netmask; /* The network mask to match */
};
#endif
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: net_del_ipv4route
*
* Description:
* Return 1 if the route is available, and delete the match route
*
* Input 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_RAMROUTE
static int net_del_ipv4route(FAR struct net_route_ipv4_s *route,
FAR void *arg)
{
FAR struct route_match_ipv4_s *match =
(FAR struct route_match_ipv4_s *)arg;
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/* 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");
include/endian.h: Fix format specifies type 'unsigned long' but the argument has type 'unsigned int' Error: route/net_del_ramroute.c:94:9: error: format specifies type 'unsigned long' but the argument has type 'unsigned int' [-Werror,-Wformat] HTONL(match->target), HTONL(match->netmask)); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ /github/workspace/sources/nuttx/include/debug.h:232:23: note: expanded from macro 'ninfo' ^ /github/workspace/sources/nuttx/include/debug.h:102:43: note: expanded from macro '_none' do { if (0) syslog(LOG_ERR, format, ##__VA_ARGS__); } while (0) ~~~~~~ ^~~~~~~~~~~ /github/workspace/sources/nuttx/include/netinet/in.h:233:17: note: expanded from macro 'HTONL' ^ /github/workspace/sources/nuttx/include/endian.h:63:25: note: expanded from macro '__swap_uint32' ^ Error: route/net_del_ramroute.c:94:31: error: format specifies type 'unsigned long' but the argument has type 'unsigned int' [-Werror,-Wformat] HTONL(match->target), HTONL(match->netmask)); ~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~ /github/workspace/sources/nuttx/include/debug.h:232:23: note: expanded from macro 'ninfo' ^ /github/workspace/sources/nuttx/include/debug.h:102:43: note: expanded from macro '_none' do { if (0) syslog(LOG_ERR, format, ##__VA_ARGS__); } while (0) ~~~~~~ ^~~~~~~~~~~ /github/workspace/sources/nuttx/include/netinet/in.h:233:17: note: expanded from macro 'HTONL' ^ /github/workspace/sources/nuttx/include/endian.h:63:25: note: expanded from macro '__swap_uint32' Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>
2022-10-25 22:13:03 +02:00
ninfo(" target=%08" PRIx32 " netmask=%08" PRIx32 "\n",
HTONL(match->target), HTONL(match->netmask));
if (net_ipv4addr_maskcmp(route->target, match->target, match->netmask) &&
net_ipv4addr_cmp(route->netmask, match->netmask))
{
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/* They match.. Remove the entry from the routing table */
if (match->prev)
{
ramroute_ipv4_remafter(
(FAR struct net_route_ipv4_entry_s *)match->prev,
&g_ipv4_routes);
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}
else
{
ramroute_ipv4_remfirst(&g_ipv4_routes);
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}
netlink_route_notify(route, RTM_DELROUTE, AF_INET);
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/* And free the routing table entry by adding it to the free list */
net_freeroute_ipv4(route);
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/* Return a non-zero value to terminate the traversal */
return 1;
}
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/* Next time we are here, this will be the previous entry */
match->prev = route;
return 0;
}
#endif
#ifdef CONFIG_ROUTE_IPv6_RAMROUTE
static int net_del_ipv6route(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.. Remove the entry from the routing table */
if (match->prev)
{
ramroute_ipv6_remafter(
(FAR struct net_route_ipv6_entry_s *)match->prev,
&g_ipv6_routes);
}
else
{
ramroute_ipv6_remfirst(&g_ipv6_routes);
}
netlink_route_notify(route, RTM_DELROUTE, AF_INET6);
/* And free the routing table entry by adding it to the free list */
net_freeroute_ipv6(route);
/* Return a non-zero value to terminate the traversal */
return 1;
}
/* Next time we are here, this will be the previous entry */
match->prev = route;
return 0;
}
#endif
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: net_delroute_ipv4 and net_delroute_ipv6
*
* Description:
* Remove an existing route from the routing table
*
* Input Parameters:
*
* Returned Value:
* OK on success; Negated errno on failure.
*
****************************************************************************/
#ifdef CONFIG_ROUTE_IPv4_RAMROUTE
int net_delroute_ipv4(in_addr_t target, in_addr_t netmask)
{
This commit adds support for routing tables in files in a file system. This might be useful for customized, per-unit routing tables. 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.
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struct route_match_ipv4_s match;
/* Set up the comparison structure */
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match.prev = NULL;
net_ipv4addr_copy(match.target, target);
net_ipv4addr_copy(match.netmask, netmask);
/* Then remove the entry from the routing table */
return net_foreachroute_ipv4(net_del_ipv4route, &match) ? OK : -ENOENT;
}
#endif
#ifdef CONFIG_ROUTE_IPv6_RAMROUTE
int net_delroute_ipv6(net_ipv6addr_t target, net_ipv6addr_t netmask)
{
struct route_match_ipv6_s match;
/* Set up the comparison structure */
match.prev = NULL;
net_ipv6addr_copy(match.target, target);
net_ipv6addr_copy(match.netmask, netmask);
/* Then remove the entry from the routing table */
return net_foreachroute_ipv6(net_del_ipv6route, &match) ? OK : -ENOENT;
}
#endif
#endif /* CONFIG_ROUTE_IPv4_RAMROUTE || CONFIG_ROUTE_IPv6_RAMROUTE */