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nuttx/net/procfs/net_procfs_route.c
Xiang Xiao 6a3c2aded6 Fix wait loop and void cast (#24) 
* Simplify EINTR/ECANCEL error handling

1. Add semaphore uninterruptible wait function
2 .Replace semaphore wait loop with a single uninterruptible wait
3. Replace all sem_xxx to nxsem_xxx

* Unify the void cast usage

1. Remove void cast for function because many place ignore the returned value witout cast
2. Replace void cast for variable with UNUSED macro
2020-01-02 10:54:43 -06:00

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/****************************************************************************
* net/procfs/fs_procfs_route.c
*
* Copyright (C) 2017 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 <sys/types.h>
#include <sys/statfs.h>
#include <sys/stat.h>
#include <stdint.h>
#include <stdbool.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <assert.h>
#include <errno.h>
#include <debug.h>
#include <nuttx/kmalloc.h>
#include <nuttx/fs/fs.h>
#include <nuttx/fs/procfs.h>
#include <nuttx/fs/dirent.h>
#include "route/route.h"
#if !defined(CONFIG_DISABLE_MOUNTPOINT) && defined(CONFIG_FS_PROCFS)
#ifndef CONFIG_FS_PROCFS_EXCLUDE_ROUTE
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* Determines the size of an intermediate buffer that must be large enough
* to handle the longest line generated by this logic.
*/
#define STATUS_LINELEN 58
/* Directory entry indices */
#if defined(CONFIG_NET_IPv4) && defined(CONFIG_NET_IPv6)
# define IPv4_INDEX 0
# define IPv6_INDEX 1
#elif defined(CONFIG_NET_IPv4)
# define IPv4_INDEX 0
#elif defined(CONFIG_NET_IPv6)
# define IPv6_INDEX 0
#endif
/****************************************************************************
* Private Types
****************************************************************************/
/* This enumeration identifies all of the nodes that can be accessed via the
* procfs file system.
*/
enum route_node_e
{
PROC_ROUTE = 0 /* The top-level directory */
#ifdef CONFIG_NET_IPv4
, PROC_ROUTE_IPv4 /* IPv4 routing table */
#endif
#ifdef CONFIG_NET_IPv6
, PROC_ROUTE_IPv6 /* IPv6 routing table */
#endif
};
/* This structure describes one open "file" */
struct route_file_s
{
struct procfs_file_s base; /* Base open file structure */
FAR const char *name; /* Terminal node segment name */
uint8_t node; /* Type of node (see enum route_node_e) */
char line[STATUS_LINELEN]; /* Pre-allocated buffer for formatted lines */
};
/* This structure describes one open "directory" */
struct route_dir_s
{
struct procfs_dir_priv_s base; /* Base directory private data */
FAR const char *name; /* Terminal node segment name */
uint8_t node; /* Type of node (see enum route_node_e) */
};
/* The structure is used when traversing routing tables */
struct route_info_s
{
FAR char *line; /* Intermediate line buffer pointer */
FAR char *buffer; /* User buffer */
size_t linelen; /* Size of the intermediate buffer */
size_t buflen; /* Size of the user buffer */
size_t remaining; /* Bytes remaining in user buffer */
size_t totalsize; /* Accumulated size of the copy */
off_t offset; /* Skip offset */
bool header; /* True: header has been generated */
int16_t index; /* Routing table index */
};
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
/* Helpers */
static void route_sprintf(FAR struct route_info_s *info,
FAR const char *fmt, ...);
#ifdef CONFIG_NET_IPv4
static int route_ipv4_entry(FAR struct net_route_ipv4_s *route,
FAR void *arg);
#endif
#ifdef CONFIG_NET_IPv6
static int route_ipv6_entry(FAR struct net_route_ipv6_s *route,
FAR void *arg);
#endif
#ifdef CONFIG_NET_IPv4
static ssize_t route_ipv4_table(FAR struct route_file_s *procfile,
FAR char *buffer, size_t buflen, off_t offset);
#endif
#ifdef CONFIG_NET_IPv6
static ssize_t route_ipv6_table(FAR struct route_file_s *procfile,
FAR char *buffer, size_t buflen, off_t offset);
#endif
/* File system methods */
static int route_open(FAR struct file *filep, FAR const char *relpath,
int oflags, mode_t mode);
static int route_close(FAR struct file *filep);
static ssize_t route_read(FAR struct file *filep, FAR char *buffer,
size_t buflen);
static int route_dup(FAR const struct file *oldp,
FAR struct file *newp);
static int route_opendir(const char *relpath,
FAR struct fs_dirent_s *dir);
static int route_closedir(FAR struct fs_dirent_s *dir);
static int route_readdir(FAR struct fs_dirent_s *dir);
static int route_rewinddir(FAR struct fs_dirent_s *dir);
static int route_stat(FAR const char *relpath, FAR struct stat *buf);
/****************************************************************************
* Public Data
****************************************************************************/
/* See fs_mount.c -- this structure is explicitly externed there.
* We use the old-fashioned kind of initializers so that this will compile
* with any compiler.
*/
const struct procfs_operations net_procfs_routeoperations =
{
route_open, /* open */
route_close, /* close */
route_read, /* read */
NULL, /* write */
route_dup, /* dup */
route_opendir, /* opendir */
route_closedir, /* closedir */
route_readdir, /* readdir */
route_rewinddir, /* rewinddir */
route_stat /* stat */
};
/****************************************************************************
* Private Data
****************************************************************************/
/* Well-known paths */
static const char g_route_path[] = "net/route";
#ifdef CONFIG_NET_IPv4
static const char g_route_ipv4_path[] = "net/route/ipv4";
#endif
#ifdef CONFIG_NET_IPv6
static const char g_route_ipv6_path[] = "net/route/ipv6";
#endif
/* Subdirectory names */
#ifdef CONFIG_NET_IPv4
static const char g_route_ipv4_subdir[] = "ipv4";
#endif
#ifdef CONFIG_NET_IPv6
static const char g_route_ipv6_subdir[] = "ipv6";
#endif
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: route_sprintf
*
* Description:
* Format:
*
* 11111111112222222222333
* 12345678901234567890123456789012
* SEQ TARGET NETMASK ROUTER
* nnnn. xxxxxxxx xxxxxxxx xxxxxxxx
*
****************************************************************************/
static void route_sprintf(FAR struct route_info_s *info,
FAR const char *fmt, ...)
{
size_t linesize;
size_t copysize;
va_list ap;
/* Print the format and data to a line buffer */
va_start(ap, fmt);
linesize = vsnprintf(info->line, info->linelen, fmt, ap);
va_end(ap);
/* Copy the line buffer to the user buffer */
copysize = procfs_memcpy(info->line, linesize,
info->buffer, info->remaining,
&info->offset);
/* Update counts and pointers */
info->totalsize += copysize;
info->buffer += copysize;
info->remaining -= copysize;
}
/****************************************************************************
* Name: route_ipv4_entry
*
* Description:
* Format:
*
* 11111111112222222222333333333344444444444555
* 12345678901234567890123456789012345678901234567890123
* SEQ TARGET NETMASK ROUTER
* nnnn. xxx.xxx.xxx.xxx xxx.xxx.xxx.xxx xxx.xxx.xxx.xxx
*
****************************************************************************/
#ifdef CONFIG_NET_IPv4
static int route_ipv4_entry(FAR struct net_route_ipv4_s *route, FAR void *arg)
{
FAR struct route_info_s *info = (FAR struct route_info_s *)arg;
char target[INET_ADDRSTRLEN];
char netmask[INET_ADDRSTRLEN];
char router[INET_ADDRSTRLEN];
DEBUGASSERT(info != NULL);
/* Generate the header before the first entry */
if (info->index == 0 && !info->header)
{
route_sprintf(info, "%-4s %-16s%-16s%-16s\n",
"SEQ", "TARGET", "NETMASK", "ROUTER");
if (info->totalsize >= info->buflen)
{
/* Only part of the header was printed. */
return 1;
}
/* The whole header was printed. */
info->header = true;
}
/* Generate routing table entry on one line */
inet_ntop(AF_INET, &route->target, target, INET_ADDRSTRLEN);
inet_ntop(AF_INET, &route->netmask, netmask, INET_ADDRSTRLEN);
inet_ntop(AF_INET, &route->router, router, INET_ADDRSTRLEN);
info->index++;
route_sprintf(info, "%4u. %-16s%-16s%-16s\n",
info->index, target, netmask, router);
return (info->totalsize >= info->buflen) ? 1 : 0;
}
#endif
/****************************************************************************
* Name: route_ipv6_entry
*
* Description:
* Format:
*
* 11111111112222222222333333333344444444445555
* 12345678901234567890123456789012345678901234567890123
* nnnn. target: xxxx:xxxx:xxxx:xxxxxxxx:xxxx:xxxx:xxxx
* netmask: xxxx:xxxx:xxxx:xxxxxxxx:xxxx:xxxx:xxxx
* router: xxxx:xxxx:xxxx:xxxxxxxx:xxxx:xxxx:xxxx
*
****************************************************************************/
#ifdef CONFIG_NET_IPv6
static int route_ipv6_entry(FAR struct net_route_ipv6_s *route, FAR void *arg)
{
FAR struct route_info_s *info = (FAR struct route_info_s *)arg;
char addr[INET6_ADDRSTRLEN];
DEBUGASSERT(info != NULL);
/* Generate routing table entry on three lines */
info->index++;
inet_ntop(AF_INET6, route->target, addr, INET6_ADDRSTRLEN);
route_sprintf(info, "%4u. TARGET %s\n", info->index, addr);
if (info->totalsize >= info->buflen)
{
return 1;
}
inet_ntop(AF_INET6, route->netmask, addr, INET6_ADDRSTRLEN);
route_sprintf(info, " NETMASK %s\n", addr);
if (info->totalsize >= info->buflen)
{
return 1;
}
inet_ntop(AF_INET6, route->router, addr, INET6_ADDRSTRLEN);
route_sprintf(info, " ROUTER %s\n", addr);
return (info->totalsize >= info->buflen) ? 1 : 0;
}
#endif
/****************************************************************************
* Name: route_ipv4_table
*
* Description:
* Format:
*
* 11111111112222222222333333333344444444444555
* 12345678901234567890123456789012345678901234567890123
* SEQ TARGET NETMASK ROUTER
* nnnn. xxx.xxx.xxx.xxx xxx.xxx.xxx.xxx xxx.xxx.xxx.xxx
*
****************************************************************************/
#ifdef CONFIG_NET_IPv4
static ssize_t route_ipv4_table(FAR struct route_file_s *procfile,
FAR char *buffer, size_t buflen, off_t offset)
{
struct route_info_s info;
memset(&info, 0, sizeof(struct route_info_s));
info.line = procfile->line;
info.buffer = buffer;
info.linelen = STATUS_LINELEN;
info.buflen = buflen;
info.remaining = buflen;
info.offset = offset;
/* Generate each entry in the routing table */
net_foreachroute_ipv4(route_ipv4_entry, &info);
return info.totalsize;
}
#endif
/****************************************************************************
* Name: route_ipv6_table
****************************************************************************/
#ifdef CONFIG_NET_IPv6
static ssize_t route_ipv6_table(FAR struct route_file_s *procfile,
FAR char *buffer, size_t buflen, off_t offset)
{
struct route_info_s info;
memset(&info, 0, sizeof(struct route_info_s));
info.line = procfile->line;
info.buffer = buffer;
info.linelen = STATUS_LINELEN;
info.buflen = buflen;
info.remaining = buflen;
info.offset = offset;
/* Generate each entry in the routing table */
net_foreachroute_ipv6(route_ipv6_entry, &info);
return info.totalsize;
}
#endif
/****************************************************************************
* Name: route_open
****************************************************************************/
static int route_open(FAR struct file *filep, FAR const char *relpath,
int oflags, mode_t mode)
{
FAR struct route_file_s *procfile;
FAR const char *name;
uint8_t node;
finfo("Open '%s'\n", relpath);
/* PROCFS is read-only. Any attempt to open with any kind of write
* access is not permitted.
*
* REVISIT: Write-able proc files could be quite useful.
*/
if ((oflags & O_WRONLY) != 0 || (oflags & O_RDONLY) == 0)
{
ferr("ERROR: Only O_RDONLY supported\n");
return -EACCES;
}
/* There are only two possibilities */
#ifdef CONFIG_NET_IPv4
if (strcmp(relpath, g_route_ipv4_path) == 0)
{
name = g_route_ipv4_subdir;
node = PROC_ROUTE_IPv4;
}
else
#endif
#ifdef CONFIG_NET_IPv6
if (strcmp(relpath, g_route_ipv6_path) == 0)
{
name = g_route_ipv6_subdir;
node = PROC_ROUTE_IPv6;
}
else
#endif
{
ferr("ERROR: Invalid path \"%s\"\n", relpath);
return -ENOENT;
}
/* Allocate a container to hold the task and node selection */
procfile = (FAR struct route_file_s *)
kmm_zalloc(sizeof(struct route_file_s));
if (!procfile)
{
ferr("ERROR: Failed to allocate file container\n");
return -ENOMEM;
}
/* Initialize the file container */
procfile->name = name; /* Terminal node segment name */
procfile->node = node; /* Type of node (see enum route_node_e) */
/* Save the index as the open-specific state in filep->f_priv */
filep->f_priv = (FAR void *)procfile;
return OK;
}
/****************************************************************************
* Name: route_close
****************************************************************************/
static int route_close(FAR struct file *filep)
{
FAR struct route_file_s *procfile;
/* Recover our private data from the struct file instance */
procfile = (FAR struct route_file_s *)filep->f_priv;
DEBUGASSERT(procfile);
/* Release the file container structure */
kmm_free(procfile);
filep->f_priv = NULL;
return OK;
}
/****************************************************************************
* Name: route_read
****************************************************************************/
static ssize_t route_read(FAR struct file *filep, FAR char *buffer,
size_t buflen)
{
FAR struct route_file_s *procfile;
ssize_t ret;
finfo("buffer=%p buflen=%d\n", buffer, (int)buflen);
/* Recover our private data from the struct file instance */
procfile = (FAR struct route_file_s *)filep->f_priv;
DEBUGASSERT(procfile);
/* Provide the requested data */
switch (procfile->node)
{
#ifdef CONFIG_NET_IPv4
case PROC_ROUTE_IPv4: /* IPv4 routing table */
ret = route_ipv4_table(procfile, buffer, buflen, filep->f_pos);
break;
#endif
#ifdef CONFIG_NET_IPv6
case PROC_ROUTE_IPv6: /* IPv6 routing table */
ret = route_ipv6_table(procfile, buffer, buflen, filep->f_pos);
break;
#endif
default:
ret = -EINVAL;
break;
}
/* Update the file offset */
if (ret > 0)
{
filep->f_pos += ret;
}
return ret;
}
/****************************************************************************
* Name: route_dup
*
* Description:
* Duplicate open file data in the new file structure.
*
****************************************************************************/
static int route_dup(FAR const struct file *oldp, FAR struct file *newp)
{
FAR struct route_file_s *oldfile;
FAR struct route_file_s *newfile;
finfo("Dup %p->%p\n", oldp, newp);
/* Recover our private data from the old struct file instance */
oldfile = (FAR struct route_file_s *)oldp->f_priv;
DEBUGASSERT(oldfile);
/* Allocate a new container to hold the task and node selection */
newfile = (FAR struct route_file_s *)
kmm_malloc(sizeof(struct route_file_s));
if (!newfile)
{
ferr("ERROR: Failed to allocate file container\n");
return -ENOMEM;
}
/* The copy the file information from the old container to the new */
memcpy(newfile, oldfile, sizeof(struct route_file_s));
/* Save the new container in the new file structure */
newp->f_priv = (FAR void *)newfile;
return OK;
}
/****************************************************************************
* Name: route_opendir
*
* Description:
* Open a directory for read access
*
****************************************************************************/
static int route_opendir(FAR const char *relpath,
FAR struct fs_dirent_s *dir)
{
FAR struct route_dir_s *level2;
finfo("relpath: \"%s\"\n", relpath ? relpath : "NULL");
DEBUGASSERT(relpath && dir && !dir->u.procfs);
/* Check the relative path */
if (strcmp(relpath, g_route_path) != 0)
{
#ifdef CONFIG_NET_IPv4
if (strcmp(relpath, g_route_ipv4_path) == 0)
{
return -ENOTDIR;
}
#endif
#ifdef CONFIG_NET_IPv6
if (strcmp(relpath, g_route_ipv6_path) == 0)
{
return -ENOTDIR;
}
#endif
return -ENOENT;
}
level2 = (FAR struct route_dir_s *)
kmm_zalloc(sizeof(struct route_dir_s));
if (!level2)
{
ferr("ERROR: Failed to allocate the directory structure\n");
return -ENOMEM;
}
/* This is a second level directory */
level2->base.level = 2;
level2->base.nentries = 2;
level2->name = "";
level2->node = PROC_ROUTE;
dir->u.procfs = (FAR void *)level2;
return OK;
}
/****************************************************************************
* Name: route_closedir
*
* Description: Close the directory listing
*
****************************************************************************/
static int route_closedir(FAR struct fs_dirent_s *dir)
{
FAR struct route_dir_s *priv;
DEBUGASSERT(dir && dir->u.procfs);
priv = dir->u.procfs;
if (priv != NULL)
{
kmm_free(priv);
}
dir->u.procfs = NULL;
return OK;
}
/****************************************************************************
* Name: route_readdir
*
* Description: Read the next directory entry
*
****************************************************************************/
static int route_readdir(struct fs_dirent_s *dir)
{
FAR struct route_dir_s *level2;
FAR const char *dname;
unsigned int index;
DEBUGASSERT(dir != NULL && dir->u.procfs != NULL);
level2 = dir->u.procfs;
/* The index determines which entry to return */
index = level2->base.index;
#ifdef CONFIG_NET_IPv4
if (index == IPv4_INDEX)
{
dname = g_route_ipv4_subdir;
}
else
#endif
#ifdef CONFIG_NET_IPv6
if (index == IPv6_INDEX)
{
dname = g_route_ipv6_subdir;
}
else
#endif
{
/* We signal the end of the directory by returning the special
* error -ENOENT
*/
finfo("Entry %d: End of directory\n", index);
return -ENOENT;
}
/* Save the filename and file type */
dir->fd_dir.d_type = DTYPE_FILE;
strncpy(dir->fd_dir.d_name, dname, NAME_MAX + 1);
/* Set up the next directory entry offset. NOTE that we could use the
* standard f_pos instead of our own private index.
*/
level2->base.index = index + 1;
return OK;
}
/****************************************************************************
* Name: proc_rewindir
*
* Description: Reset directory read to the first entry
*
****************************************************************************/
static int route_rewinddir(struct fs_dirent_s *dir)
{
FAR struct route_dir_s *priv;
DEBUGASSERT(dir && dir->u.procfs);
priv = dir->u.procfs;
priv->base.index = 0;
return OK;
}
/****************************************************************************
* Name: route_stat
*
* Description: Return information about a file or directory
*
****************************************************************************/
static int route_stat(const char *relpath, struct stat *buf)
{
memset(buf, 0, sizeof(struct stat));
if (strcmp(relpath, g_route_path) == 0)
{
buf->st_mode = S_IFDIR | S_IROTH | S_IRGRP | S_IRUSR;
}
else
#ifdef CONFIG_NET_IPv4
if (strcmp(relpath, g_route_ipv4_path) == 0)
{
buf->st_mode = S_IFREG | S_IROTH | S_IRGRP | S_IRUSR;
}
else
#endif
#ifdef CONFIG_NET_IPv6
if (strcmp(relpath, g_route_ipv6_path) == 0)
{
buf->st_mode = S_IFREG | S_IROTH | S_IRGRP | S_IRUSR;
}
else
#endif
{
return -ENOENT;
}
return OK;
}
/****************************************************************************
* Public Functions
****************************************************************************/
#endif /* CONFIG_FS_PROCFS_EXCLUDE_ROUTE */
#endif /* !CONFIG_DISABLE_MOUNTPOINT && CONFIG_FS_PROCFS */
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