3521aaf944
binfmt/, configs/, grahics/, libc/, mm/, net/, sched/: OS references to the errno variable should always use the set_errno(), get_errno() macros
arch/arm/src/stm32 and stm32f7: Architecture-specific code is not permitted to modify the errno variable. drivers/ and libc/: OS references to the errno variable should always use the set_errno(), get_errno() macros
864 lines
21 KiB
C
864 lines
21 KiB
C
/****************************************************************************
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* net/route/net_fileroute.c
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*
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* Copyright (C) 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 <sys/stat.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <semaphore.h>
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#include <errno.h>
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#include <assert.h>
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#include <debug.h>
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#include <nuttx/semaphore.h>
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#include <nuttx/fs/fs.h>
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#include "route/fileroute.h"
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#include "route/route.h"
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#if defined(CONFIG_ROUTE_IPv4_FILEROUTE) || defined(CONFIG_ROUTE_IPv6_FILEROUTE)
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/****************************************************************************
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* Pre-processor Defintions
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****************************************************************************/
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/* Special "impossible" PID value used to indicate that there is no holder
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* of the lock.
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*/
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#define NO_HOLDER ((pid_t)-1)
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/****************************************************************************
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* Private Data
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****************************************************************************/
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#ifdef CONFIG_ROUTE_IPv4_FILEROUTE
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/* Semaphore used to lock a routing table for exclusive write-only access */
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static sem_t g_ipv4_exclsem;
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static pid_t g_ipv4_holder = NO_HOLDER;
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static int g_ipv4_count;
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#endif
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#ifdef CONFIG_ROUTE_IPv6_FILEROUTE
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/* Semaphore used to lock a routing table for exclusive write-only access */
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static sem_t g_ipv6_exclsem;
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static pid_t g_ipv6_holder = NO_HOLDER;
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static int g_ipv6_count;
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#endif
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: net_openroute_detached
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*
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* Description:
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* Open and detach the routing table.
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*
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* Parameters:
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* pathname - The full path to the routing table entry
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* oflags - Open flags
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* filep - Location in which to return the detached file instance.
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*
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* Returned Value:
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* A non-negative file descriptor is returned on success. A negated errno
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* value is returned on any failure.
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*
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****************************************************************************/
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int net_openroute_detached(FAR const char *pathname, int oflags,
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FAR struct file *filep)
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{
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int ret;
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int fd;
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/* Open the file for read/write access. Here we borrow the file descriptor
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* of this tread of execution. We won't use it for long.
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*/
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fd = open(pathname, oflags, 0644);
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if (fd < 0)
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{
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int errcode = get_errno();
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nerr("ERROR: Failed to open %s: %d\n", pathname, errcode);
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return -errcode;
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}
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/* Now detach the file descriptor */
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ret = file_detach(fd, filep);
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if (ret < 0)
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{
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nerr("ERROR: file_detach() failed: %d\n", ret);
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(void)close(fd);
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return ret;
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}
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return OK;
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}
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/****************************************************************************
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* Name: net_routesize
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*
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* Description:
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* Return the size of a routing table in terms of the number of entries in
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* the routing table.
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*
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* Parameters:
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* path - The path to the routing table
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* entrysize - The size of one entry in the routing table
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*
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* Returned Value:
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* A non-negative count of the number of entries in the routing table is
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* returned on success; a negated errno value is returned on and failure.
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*
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****************************************************************************/
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int net_routesize(FAR const char *path, size_t entrysize)
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{
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struct stat buf;
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int ret;
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/* Get information about the file */
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ret = stat(path, &buf);
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if (ret < 0)
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{
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int errcode;
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/* stat() failed, but is that because the routing table has not been
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* created yet?
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*/
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errcode = get_errno();
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if (errcode == ENOENT)
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{
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/* The routing table file has not been created. Return size zero. */
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return 0;
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}
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/* Some other error */
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return -errcode;
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}
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/* The directory entry at this path must be a regular file */
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if (S_ISREG(buf.st_mode))
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{
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unsigned int nentries = buf.st_size / entrysize;
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#ifdef CONFIG_DEBUG_NET_WARN
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if (nentries * entrysize != buf.st_size)
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{
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nwarn("WARNING: Size of routing table is not an even mutliple of entries\n");
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nwarn(" %lu != %lu / %lu\n",
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(unsigned long)nentries,
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(unsigned long)buf.st_size,
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(unsigned long)entrysize);
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}
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#endif
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return nentries;
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}
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/* It is probably a directory (should check for sure) */
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return -EISDIR;
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}
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: net_init_fileroute
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*
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* Description:
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* Initialize the in-memory, RAM routing table
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*
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* Parameters:
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* None
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*
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* Returned Value:
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* None
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*
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* Assumptions:
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* Called early in initialization so that no special protection is needed.
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*
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****************************************************************************/
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void net_init_fileroute(void)
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{
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/* Initialize semaphores */
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#ifdef CONFIG_ROUTE_IPv4_FILEROUTE
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nxsem_init(&g_ipv4_exclsem, 0, 1);
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#endif
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#ifdef CONFIG_ROUTE_IPv6_FILEROUTE
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nxsem_init(&g_ipv6_exclsem, 0, 1);
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#endif
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}
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/****************************************************************************
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* Name: net_openroute_ipv4/net_openroute_ipv6
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*
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* Description:
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* Open the IPv4/IPv6 routing table with the specified access privileges.
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*
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* Parameters:
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* oflags - Open flags
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* filep - Location in which to return the detached file instance.
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*
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* Returned Value:
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* A non-negative file descriptor is returned on success. A negated errno
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* value is returned on any failure.
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*
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****************************************************************************/
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#ifdef CONFIG_ROUTE_IPv4_FILEROUTE
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int net_openroute_ipv4(int oflags, FAR struct file *filep)
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{
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int ret;
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/* Lock the route.. we don't want to open it while it is subject to
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* modification.
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*/
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ret = net_lockroute_ipv4();
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if (ret < 0)
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{
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nerr("ERROR: net_lockroute_ipv4() failed: %d\n", ret);
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}
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else
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{
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/* Open the file for read/write access. */
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ret = net_openroute_detached(IPv4_ROUTE_PATH, oflags, filep);
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if (ret < 0)
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{
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nerr("ERROR: net_openroute_detached() failed: %d\n", ret);
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}
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}
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(void)net_unlockroute_ipv4();
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return ret;
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}
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#endif
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#ifdef CONFIG_ROUTE_IPv6_FILEROUTE
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int net_openroute_ipv6(int oflags, FAR struct file *filep)
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{
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int ret;
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/* Lock the route.. we don't want to open it while it is subject to
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* modification.
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*/
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ret = net_lockroute_ipv6();
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if (ret < 0)
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{
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nerr("ERROR: net_lockroute_ipv6() failed: %d\n", ret);
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}
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else
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{
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/* Open the file for read/write access. */
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ret = net_openroute_detached(IPv6_ROUTE_PATH, oflags, filep);
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if (ret < 0)
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{
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nerr("ERROR: net_openroute_detached() failed: %d\n", ret);
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}
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}
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(void)net_unlockroute_ipv6();
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return ret;
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}
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#endif
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/****************************************************************************
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* Name: net_readroute_ipv4/net_readroute_ipv6
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*
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* Description:
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* Read one route entry from the IPv4/IPv6 routing table.
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*
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* Parameters:
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* filep - Detached file instance obtained by net_openroute_ipv{4|6}[_rdonly]
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* route - Location to return the next route read from the file
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*
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* Returned Value:
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* The number of bytes read on success. The special return valud of zero
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* indiates that the endof of file was encountered (and nothing was read).
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* A negated errno value is returned on any failure.
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*
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****************************************************************************/
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#ifdef CONFIG_ROUTE_IPv4_FILEROUTE
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ssize_t net_readroute_ipv4(FAR struct file *filep,
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FAR struct net_route_ipv4_s *route)
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{
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FAR uint8_t *dest;
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ssize_t ntotal;
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ssize_t ret;
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/* Lock the route.. we don't want to read from it while it is subject to
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* modification.
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*/
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ret = (ssize_t)net_lockroute_ipv4();
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if (ret < 0)
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{
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nerr("ERROR: net_lockroute_ipv4() failed: %d\n", ret);
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return ret;
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}
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/* Read one record from the current position in the routing table */
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dest = (FAR uint8_t *)route;
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ntotal = 0;
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do
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{
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size_t nbytes = sizeof(struct net_route_ipv4_s) - ntotal;
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ssize_t nread;
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nread = file_read(filep, dest, nbytes);
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if (nread <= 0)
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{
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/* Read error or end of file */
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ntotal = nread;
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break;
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}
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ntotal += nread;
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dest += nread;
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}
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while (ntotal < sizeof(struct net_route_ipv4_s));
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(void)net_unlockroute_ipv4();
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return ntotal;
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}
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#endif
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#ifdef CONFIG_ROUTE_IPv6_FILEROUTE
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ssize_t net_readroute_ipv6(FAR struct file *filep,
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FAR struct net_route_ipv6_s *route)
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{
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FAR uint8_t *dest;
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ssize_t ntotal;
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ssize_t ret;
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/* Lock the route.. we don't want to read from it while it is subject to
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* modification.
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*/
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ret = (ssize_t)net_lockroute_ipv6();
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if (ret < 0)
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{
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nerr("ERROR: net_lockroute_ipv6() failed: %d\n", ret);
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return ret;
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}
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/* Read one record from the current position in the routing table */
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dest = (FAR uint8_t *)route;
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ntotal = 0;
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do
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{
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size_t nbytes = sizeof(struct net_route_ipv6_s) - ntotal;
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ssize_t nread;
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nread = file_read(filep, dest, nbytes);
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if (nread <= 0)
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{
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/* Read error or end of file */
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ret = nread;
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break;
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}
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ntotal += nread;
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dest += nread;
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}
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while (ntotal < sizeof(struct net_route_ipv6_s));
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(void)net_unlockroute_ipv6();
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return ntotal;
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}
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#endif
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/****************************************************************************
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* Name: net_writeroute_ipv4/net_writeroute_ipv6
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*
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* Description:
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* Write one route entry to the IPv4/IPv6 routing table.
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*
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* Parameters:
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* filep - Detached file instance obtained by net_openroute_ipv{4|6}[_rdonly]
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* route - Location to return the next route read from the file
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*
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* Returned Value:
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* The number of bytes written on success. A negated errno value is
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* returned on any failure.
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*
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****************************************************************************/
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#ifdef CONFIG_ROUTE_IPv4_FILEROUTE
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ssize_t net_writeroute_ipv4(FAR struct file *filep,
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FAR const struct net_route_ipv4_s *route)
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{
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FAR const uint8_t *src;
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ssize_t ntotal;
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ssize_t ret;
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/* Lock the route.. we don't want to write to it while it is subject to
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* modification.
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*/
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ret = (ssize_t)net_lockroute_ipv4();
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if (ret < 0)
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{
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nerr("ERROR: net_lockroute_ipv4() failed: %d\n", ret);
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return ret;
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}
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/* Write one record at the current position in the routing table */
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src = (FAR const uint8_t *)route;
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ntotal = 0;
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do
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{
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size_t nbytes = sizeof(struct net_route_ipv4_s) - ntotal;
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ssize_t nwritten;
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nwritten = file_write(filep, src, nbytes);
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if (nwritten <= 0)
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{
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/* Write error (zero is not a valid return value for write) */
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ret = nwritten;
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break;
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}
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ntotal += nwritten;
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src += nwritten;
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}
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while (ntotal < sizeof(struct net_route_ipv4_s));
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(void)net_unlockroute_ipv4();
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return ntotal;
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}
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#endif
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#ifdef CONFIG_ROUTE_IPv6_FILEROUTE
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ssize_t net_writeroute_ipv6(FAR struct file *filep,
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FAR const struct net_route_ipv6_s *route)
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{
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FAR const uint8_t *src;
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ssize_t ntotal;
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ssize_t ret;
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/* Lock the route.. we don't want to write to it while it is subject to
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* modification.
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*/
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ret = (ssize_t)net_lockroute_ipv6();
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if (ret < 0)
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{
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nerr("ERROR: net_lockroute_ipv6() failed: %d\n", ret);
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return ret;
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}
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/* Write one record at the current position in the routing table */
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src = (FAR const uint8_t *)route;
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ntotal = 0;
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do
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{
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size_t nbytes = sizeof(struct net_route_ipv6_s) - ntotal;
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ssize_t nwritten;
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nwritten = file_write(filep, src, nbytes);
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if (nwritten <= 0)
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{
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/* Write error (zero is not a valid return value for write) */
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ntotal = nwritten;
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break;
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}
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ntotal += nwritten;
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src += nwritten;
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}
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while (ntotal < sizeof(struct net_route_ipv6_s));
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(void)net_unlockroute_ipv6();
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return ret;
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}
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#endif
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/****************************************************************************
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* Name: net_seekroute_ipv4/net_seekroute_ipv6
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*
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* Description:
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* Seek to a specific entry entry to the IPv4/IPv6 routing table.
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*
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* Parameters:
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* filep - Detached file instance obtained by net_openroute_ipv{4|6}[_rdonly]
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* index - The index of the routing table entry to seek to.
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*
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* Returned Value:
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* Zero (OK) is returned on success; a negated errno value is returned on
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* failure.
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*
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****************************************************************************/
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#ifdef CONFIG_ROUTE_IPv4_FILEROUTE
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off_t net_seekroute_ipv4(FAR struct file *filep, unsigned int index)
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{
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off_t offset;
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off_t ret;
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/* Convert the index to a file offset */
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offset = (off_t)index * sizeof(struct net_route_ipv4_s);
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|
|
/* Then seek to that position */
|
|
|
|
ret = file_seek(filep, offset, SEEK_SET);
|
|
if (ret < 0)
|
|
{
|
|
nerr("ERROR: file_seek() failed: %ld\n", (long)ret);
|
|
return (int)ret;
|
|
}
|
|
|
|
return OK;
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_ROUTE_IPv6_FILEROUTE
|
|
off_t net_seekroute_ipv6(FAR struct file *filep, unsigned int index)
|
|
{
|
|
off_t offset;
|
|
off_t ret;
|
|
|
|
/* Convert the index to a file offset */
|
|
|
|
offset = (off_t)index * sizeof(struct net_route_ipv6_s);
|
|
|
|
/* Then seek to that position */
|
|
|
|
ret = file_seek(filep, offset, SEEK_SET);
|
|
if (ret < 0)
|
|
{
|
|
nerr("ERROR: file_seek() failed: %ld\n", (long)ret);
|
|
return (int)ret;
|
|
}
|
|
|
|
return OK;
|
|
}
|
|
#endif
|
|
|
|
/****************************************************************************
|
|
* Name: net_routesize_ipv4/net_routesize_ipv6
|
|
*
|
|
* Description:
|
|
* Return the size of a routing table in terms of the number of entries in
|
|
* the routing table.
|
|
*
|
|
* Parameters:
|
|
* None
|
|
*
|
|
* Returned Value:
|
|
* A non-negative count of the number of entries in the routing table is
|
|
* returned on success; a negated errno value is returned on and failure.
|
|
*
|
|
* Assumptions:
|
|
* The size of the routing table may change after this size is returned
|
|
* unless the routing table is locked to prevent any modification to the
|
|
* routing table.
|
|
*
|
|
****************************************************************************/
|
|
|
|
#ifdef CONFIG_ROUTE_IPv4_FILEROUTE
|
|
int net_routesize_ipv4(void)
|
|
{
|
|
return net_routesize(IPv4_ROUTE_PATH, sizeof(struct net_route_ipv4_s));
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_ROUTE_IPv6_FILEROUTE
|
|
int net_routesize_ipv6(void)
|
|
{
|
|
return net_routesize(IPv6_ROUTE_PATH, sizeof(struct net_route_ipv6_s));
|
|
}
|
|
#endif
|
|
|
|
/****************************************************************************
|
|
* Name: net_lockroute_ipv4/net_lockroute_ipv6
|
|
*
|
|
* Description:
|
|
* Lock access to the routing table. Necessary when a routing table is
|
|
* being reorganized due to deletion of a route.
|
|
*
|
|
* Parameters:
|
|
* None
|
|
*
|
|
* Returned Value:
|
|
* Zero (OK) is returned on success; a negated errno value is returned on
|
|
* any failure.
|
|
*
|
|
****************************************************************************/
|
|
|
|
#ifdef CONFIG_ROUTE_IPv4_FILEROUTE
|
|
int net_lockroute_ipv4(void)
|
|
{
|
|
pid_t me = getpid();
|
|
int ret;
|
|
|
|
/* Are we already the holder of the lock? */
|
|
|
|
if (g_ipv4_holder == me)
|
|
{
|
|
/* Yes.. just increment the count of locks held */
|
|
|
|
g_ipv4_count++;
|
|
ret = OK;
|
|
}
|
|
else
|
|
{
|
|
/* No.. wait to get the lock */
|
|
|
|
ret = nxsem_wait(&g_ipv4_exclsem);
|
|
if (ret < 0)
|
|
{
|
|
nerr("ERROR: nxsem_wait() failed: %d\n", ret);
|
|
}
|
|
else
|
|
{
|
|
DEBUGASSERT(g_ipv4_holder == NO_HOLDER && g_ipv4_count == 0);
|
|
|
|
/* We are now the holder with one count */
|
|
|
|
g_ipv4_holder = me;
|
|
g_ipv4_count = 1;
|
|
}
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_ROUTE_IPv6_FILEROUTE
|
|
int net_lockroute_ipv6(void)
|
|
{
|
|
pid_t me = getpid();
|
|
int ret;
|
|
|
|
/* Are we already the holder of the lock? */
|
|
|
|
if (g_ipv6_holder == me)
|
|
{
|
|
/* Yes.. just increment the count of locks held */
|
|
|
|
g_ipv6_count++;
|
|
ret = OK;
|
|
}
|
|
else
|
|
{
|
|
/* No.. wait to get the lock */
|
|
|
|
ret = nxsem_wait(&g_ipv6_exclsem);
|
|
if (ret < 0)
|
|
{
|
|
nerr("ERROR: nxsem_wait() failed: %d\n", ret);
|
|
}
|
|
else
|
|
{
|
|
DEBUGASSERT(g_ipv6_holder == NO_HOLDER && g_ipv6_count == 0);
|
|
|
|
/* We are now the holder with one count */
|
|
|
|
g_ipv6_holder = me;
|
|
g_ipv6_count = 1;
|
|
}
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
#endif
|
|
|
|
/****************************************************************************
|
|
* Name: net_unlockroute_ipv4/net_unlockroute_ipv6
|
|
*
|
|
* Description:
|
|
* Release the read lock.
|
|
*
|
|
* Parameters:
|
|
* None
|
|
*
|
|
* Returned Value:
|
|
* Zero (OK) is returned on success; a negated errno value is returned on
|
|
* any failure.
|
|
*
|
|
****************************************************************************/
|
|
|
|
#ifdef CONFIG_ROUTE_IPv4_FILEROUTE
|
|
int net_unlockroute_ipv4(void)
|
|
{
|
|
pid_t me = getpid();
|
|
int ret;
|
|
|
|
/* If would be an error if we are called with on a thread that does not
|
|
* hold the lock.
|
|
*/
|
|
|
|
DEBUGASSERT(me == g_ipv4_holder && g_ipv4_count > 0);
|
|
|
|
/* Release the count on the lock. If this is the last count, then release
|
|
* the lock.
|
|
*/
|
|
|
|
if (g_ipv4_count > 1)
|
|
{
|
|
/* Not the last count... just decrement the count and return success */
|
|
|
|
g_ipv4_count--;
|
|
ret = OK;
|
|
}
|
|
else
|
|
{
|
|
/* This is the last count. Release the lock */
|
|
|
|
g_ipv4_holder = NO_HOLDER;
|
|
g_ipv4_count = 0;
|
|
|
|
ret = nxsem_post(&g_ipv4_exclsem);
|
|
if (ret < 0)
|
|
{
|
|
nerr("ERROR: nxsem_post() failed: %d\n", ret);
|
|
}
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_ROUTE_IPv6_FILEROUTE
|
|
int net_unlockroute_ipv6(void)
|
|
{
|
|
pid_t me = getpid();
|
|
int ret;
|
|
|
|
/* If would be an error if we are called with on a thread that does not
|
|
* hold the lock.
|
|
*/
|
|
|
|
DEBUGASSERT(me == g_ipv6_holder && g_ipv6_count > 0);
|
|
|
|
/* Release the count on the lock. If this is the last count, then release
|
|
* the lock.
|
|
*/
|
|
|
|
if (g_ipv6_count > 1)
|
|
{
|
|
/* Not the last count... just decrement the count and return success */
|
|
|
|
g_ipv6_count--;
|
|
ret = OK;
|
|
}
|
|
else
|
|
{
|
|
/* This is the last count. Release the lock */
|
|
|
|
g_ipv6_holder = NO_HOLDER;
|
|
g_ipv6_count = 0;
|
|
|
|
ret = nxsem_post(&g_ipv6_exclsem);
|
|
if (ret < 0)
|
|
{
|
|
nerr("ERROR: nxsem_post() failed: %d\n", ret);
|
|
}
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
#endif
|
|
|
|
/****************************************************************************
|
|
* Name: net_closeroute_ipv4/net_closeroute_ipv6
|
|
*
|
|
* Description:
|
|
* Close the IPv4/IPv6 routing table.
|
|
*
|
|
* Parameters:
|
|
* filep - Detached file instance obtained by net_openroute_ipv{4|6}[_rdonly]
|
|
*
|
|
* Returned Value:
|
|
* Zero (OK) is returned on success. A negated errno value is returned on
|
|
* any failure.
|
|
*
|
|
****************************************************************************/
|
|
|
|
#ifdef CONFIG_ROUTE_IPv4_FILEROUTE
|
|
int net_closeroute_ipv4(FAR struct file *filep)
|
|
{
|
|
return file_close_detached(filep);
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_ROUTE_IPv6_FILEROUTE
|
|
int net_closeroute_ipv6(FAR struct file *filep)
|
|
{
|
|
return file_close_detached(filep);
|
|
}
|
|
#endif
|
|
|
|
#endif /* CONFIG_ROUTE_IPv4_FILEROUTE || CONFIG_ROUTE_IPv6_FILEROUTE */
|