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nuttx/net/procfs/net_procfs.c
Alin Jerpelea 37d5c1b0d9 net: Author Gregory Nutt: update licenses to Apache 
Gregory Nutt has submitted the SGA and we can migrate the licenses
 to Apache.

Signed-off-by: Alin Jerpelea <alin.jerpelea@sony.com>
2021-02-20 00:38:18 -08:00

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/****************************************************************************
* net/procfs/net_procfs.c
*
* 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 <sys/types.h>
#include <sys/stat.h>
#include <stdint.h>
#include <stdbool.h>
#include <string.h>
#include <fcntl.h>
#include <libgen.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 <nuttx/lib/regex.h>
#include <nuttx/net/netdev.h>
#include "netdev/netdev.h"
#include "procfs/procfs.h"
#if !defined(CONFIG_DISABLE_MOUNTPOINT) && defined(CONFIG_FS_PROCFS) && \
!defined(CONFIG_FS_PROCFS_EXCLUDE_NET)
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* Directory entry indices */
#ifdef CONFIG_NET_STATISTICS
# define STAT_INDEX 0
# ifdef CONFIG_NET_MLD
# define MLD_INDEX 1
# define _ROUTE_INDEX 2
# else
# define _ROUTE_INDEX 1
# endif
#else
# define _ROUTE_INDEX 0
#endif
#ifdef CONFIG_NET_ROUTE
# define ROUTE_INDEX _ROUTE_INDEX
# define DEV_INDEX (_ROUTE_INDEX + 1)
#else
# define DEV_INDEX _ROUTE_INDEX
#endif
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
/* File system methods */
static int netprocfs_open(FAR struct file *filep,
FAR const char *relpath,
int oflags, mode_t mode);
static int netprocfs_close(FAR struct file *filep);
static ssize_t netprocfs_read(FAR struct file *filep, FAR char *buffer,
size_t buflen);
static int netprocfs_dup(FAR const struct file *oldp,
FAR struct file *newp);
static int netprocfs_opendir(FAR const char *relpath,
FAR struct fs_dirent_s *dir);
static int netprocfs_closedir(FAR struct fs_dirent_s *dir);
static int netprocfs_readdir(FAR struct fs_dirent_s *dir);
static int netprocfs_rewinddir(FAR struct fs_dirent_s *dir);
static int netprocfs_stat(FAR const char *relpath, FAR struct stat *buf);
/****************************************************************************
* Public Data
****************************************************************************/
/* See include/nutts/fs/procfs.h
* We use the old-fashioned kind of initializers so that this will compile
* with any compiler.
*/
const struct procfs_operations net_procfsoperations =
{
netprocfs_open, /* open */
netprocfs_close, /* close */
netprocfs_read, /* read */
NULL, /* write */
netprocfs_dup, /* dup */
netprocfs_opendir, /* opendir */
netprocfs_closedir, /* closedir */
netprocfs_readdir, /* readdir */
netprocfs_rewinddir, /* rewinddir */
netprocfs_stat /* stat */
};
extern const struct procfs_operations net_procfs_routeoperations;
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: netprocfs_open
****************************************************************************/
static int netprocfs_open(FAR struct file *filep, FAR const char *relpath,
int oflags, mode_t mode)
{
FAR struct netprocfs_file_s *priv;
FAR struct net_driver_s *dev;
enum netprocfs_entry_e entry;
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) &&
(net_procfsoperations.write == NULL))
{
ferr("ERROR: Only O_RDONLY supported\n");
return -EACCES;
}
#ifdef CONFIG_NET_STATISTICS
/* "net/stat" is an acceptable value for the relpath only if network layer
* statistics are enabled.
*/
if (strcmp(relpath, "net/stat") == 0)
{
entry = NETPROCFS_SUBDIR_STAT;
dev = NULL;
}
else
#ifdef CONFIG_NET_MLD
/* "net/mld" is an acceptable value for the relpath only if MLD is
* enabled.
*/
if (strcmp(relpath, "net/mld") == 0)
{
entry = NETPROCFS_SUBDIR_MLD;
dev = NULL;
}
else
#endif
#endif
#ifdef CONFIG_NET_ROUTE
/* "net/route" is an acceptable value for the relpath only if routing
* table support is initialized.
*/
if (match("net/route/**", relpath))
{
/* Use the /net/route directory */
return net_procfs_routeoperations.open(filep, relpath, oflags, mode);
}
else
#endif
{
FAR char *devname;
FAR char *copy;
/* Otherwise, we need to search the list of registered network devices
* to determine if the name corresponds to a network device.
*/
copy = strdup(relpath);
if (copy == NULL)
{
ferr("ERROR: strdup failed\n");
return -ENOMEM;
}
devname = basename(copy);
dev = netdev_findbyname(devname);
kmm_free(copy);
if (dev == NULL)
{
ferr("ERROR: relpath is '%s'\n", relpath);
return -ENOENT;
}
entry = NETPROCFS_SUBDIR_DEV;
}
/* Allocate the open file structure */
priv = (FAR struct netprocfs_file_s *)
kmm_zalloc(sizeof(struct netprocfs_file_s));
if (!priv)
{
ferr("ERROR: Failed to allocate file attributes\n");
return -ENOMEM;
}
/* Initialize the open-file structure */
priv->dev = dev;
priv->entry = entry;
/* Save the open file structure as the open-specific state in
* filep->f_priv.
*/
filep->f_priv = (FAR void *)priv;
return OK;
}
/****************************************************************************
* Name: netprocfs_close
****************************************************************************/
static int netprocfs_close(FAR struct file *filep)
{
FAR struct netprocfs_file_s *priv;
/* Recover our private data from the struct file instance */
priv = (FAR struct netprocfs_file_s *)filep->f_priv;
DEBUGASSERT(priv);
/* Release the file attributes structure */
kmm_free(priv);
filep->f_priv = NULL;
return OK;
}
/****************************************************************************
* Name: netprocfs_read
****************************************************************************/
static ssize_t netprocfs_read(FAR struct file *filep, FAR char *buffer,
size_t buflen)
{
FAR struct netprocfs_file_s *priv;
ssize_t nreturned;
finfo("buffer=%p buflen=%lu\n", buffer, (unsigned long)buflen);
/* Recover our private data from the struct file instance */
priv = (FAR struct netprocfs_file_s *)filep->f_priv;
DEBUGASSERT(priv);
/* Read according to the sub-directory */
switch (priv->entry)
{
case NETPROCFS_SUBDIR_DEV:
/* Show device-specific statistics */
nreturned = netprocfs_read_devstats(priv, buffer, buflen);
break;
#ifdef CONFIG_NET_STATISTICS
case NETPROCFS_SUBDIR_STAT:
/* Show the network layer statistics */
nreturned = netprocfs_read_netstats(priv, buffer, buflen);
break;
#ifdef CONFIG_NET_MLD
case NETPROCFS_SUBDIR_MLD:
/* Show the MLD statistics */
nreturned = netprocfs_read_mldstats(priv, buffer, buflen);
break;
#endif
#endif
#ifdef CONFIG_NET_ROUTE
case NETPROCFS_SUBDIR_ROUTE:
nerr("ERROR: Cannot read from directory net/route\n");
#endif
default:
nerr("ERROR: Invalid entry for reading: %u\n", priv->entry);
nreturned = -EINVAL;
}
/* Update the file offset */
if (nreturned > 0)
{
filep->f_pos += nreturned;
}
return nreturned;
}
/****************************************************************************
* Name: netprocfs_dup
*
* Description:
* Duplicate open file data in the new file structure.
*
****************************************************************************/
static int netprocfs_dup(FAR const struct file *oldp, FAR struct file *newp)
{
FAR struct netprocfs_file_s *oldpriv;
FAR struct netprocfs_file_s *newpriv;
finfo("Dup %p->%p\n", oldp, newp);
/* Recover our private data from the old struct file instance */
oldpriv = (FAR struct netprocfs_file_s *)oldp->f_priv;
DEBUGASSERT(oldpriv);
/* Allocate a new container to hold the task and attribute selection */
newpriv = (FAR struct netprocfs_file_s *)
kmm_zalloc(sizeof(struct netprocfs_file_s));
if (!newpriv)
{
ferr("ERROR: Failed to allocate file attributes\n");
return -ENOMEM;
}
/* The copy the file attribute from the old attributes to the new */
memcpy(newpriv, oldpriv, sizeof(struct netprocfs_file_s));
/* Save the new attributes in the new file structure */
newp->f_priv = (FAR void *)newpriv;
return OK;
}
/****************************************************************************
* Name: netprocfs_opendir
*
* Description:
* Open a directory for read access
*
****************************************************************************/
static int netprocfs_opendir(FAR const char *relpath,
FAR struct fs_dirent_s *dir)
{
FAR struct netprocfs_level1_s *level1;
int ndevs;
int ret;
finfo("relpath: \"%s\"\n", relpath ? relpath : "NULL");
DEBUGASSERT(relpath && dir && !dir->u.procfs);
/* "net" and "net/route" are the only values of relpath that are
* directories.
*/
#ifdef CONFIG_NET_ROUTE
if (match("net/route", relpath) || match("net/route/**", relpath))
{
/* Use the /net/route directory */
return net_procfs_routeoperations.opendir(relpath, dir);
}
#endif
/* Assume that path refers to the 1st level subdirectory. Allocate the
* level1 the dirent structure before checking.
*/
level1 = (FAR struct netprocfs_level1_s *)
kmm_zalloc(sizeof(struct netprocfs_level1_s));
if (level1 == NULL)
{
ferr("ERROR: Failed to allocate the level1 directory structure\n");
return -ENOMEM;
}
level1->base.level = 1;
if (strcmp(relpath, "net") == 0 || strcmp(relpath, "net/") == 0)
{
/* Count the number of network devices */
ndevs = netdev_count();
/* Initialize base structure components */
level1->base.nentries = ndevs;
#ifdef CONFIG_NET_STATISTICS
level1->base.nentries++;
#ifdef CONFIG_NET_MLD
level1->base.nentries++;
#endif
#endif
#ifdef CONFIG_NET_ROUTE
level1->base.nentries++;
#endif
}
else
{
/* REVISIT: We really need to check if the relpath refers to a network
* device. In that case, we need to return -ENOTDIR. Otherwise, we
* should return -ENOENT.
*/
ferr("ERROR: Bad relpath: %s\n", relpath);
ret = -ENOTDIR;
goto errout_with_alloc;
}
dir->u.procfs = (FAR void *)level1;
return OK;
errout_with_alloc:
kmm_free(level1);
return ret;
}
/****************************************************************************
* Name: netprocfs_closedir
*
* Description: Close the directory listing
*
****************************************************************************/
static int netprocfs_closedir(FAR struct fs_dirent_s *dir)
{
FAR struct netprocfs_level1_s *priv;
DEBUGASSERT(dir && dir->u.procfs);
priv = dir->u.procfs;
if (priv)
{
kmm_free(priv);
}
dir->u.procfs = NULL;
return OK;
}
/****************************************************************************
* Name: netprocfs_readdir
*
* Description: Read the next directory entry
*
****************************************************************************/
static int netprocfs_readdir(FAR struct fs_dirent_s *dir)
{
FAR struct netprocfs_level1_s *level1;
FAR struct net_driver_s *dev;
int index;
int ret;
DEBUGASSERT(dir && dir->u.procfs);
level1 = dir->u.procfs;
DEBUGASSERT(level1->base.level > 0);
/* Are we searching this directory? Or is it just an intermediate on the
* way to a sub-directory?
*/
if (level1->base.level == 1)
{
/* This directory.. Have we reached the end of the directory? */
index = level1->base.index;
DEBUGASSERT(index <= level1->base.nentries);
if (index >= level1->base.nentries)
{
/* We signal the end of the directory by returning the special
* error -ENOENT.
*/
finfo("Entry %d: End of directory\n", index);
return -ENOENT;
}
#ifdef CONFIG_NET_STATISTICS
if (index == STAT_INDEX)
{
/* Copy the network statistics directory entry */
dir->fd_dir.d_type = DTYPE_FILE;
strncpy(dir->fd_dir.d_name, "stat", NAME_MAX + 1);
}
else
#ifdef CONFIG_NET_MLD
if (index == MLD_INDEX)
{
/* Copy the MLD directory entry */
dir->fd_dir.d_type = DTYPE_FILE;
strncpy(dir->fd_dir.d_name, "mld", NAME_MAX + 1);
}
else
#endif
#endif
#ifdef CONFIG_NET_ROUTE
if (index == ROUTE_INDEX)
{
/* Copy the network statistics directory entry */
dir->fd_dir.d_type = DTYPE_DIRECTORY;
strncpy(dir->fd_dir.d_name, "route", NAME_MAX + 1);
}
else
#endif
{
int ifindex;
#ifdef CONFIG_NETDEV_IFINDEX
/* For the first network device, ifindex will be zero. We have
* to take some special action to get the correct starting
* ifindex.
*/
if (level1->ifindex == 0)
{
ifindex = netdev_nextindex(1);
}
else
{
ifindex = netdev_nextindex(level1->ifindex);
}
if (ifindex < 0)
{
/* There are no more... one must have been unregistered */
return -ENOENT;
}
level1->ifindex = ifindex + 1;
#else
/* Get the raw index, accounting for 1 based indexing */
ifindex = index - DEV_INDEX + 1;
#endif
/* Find the device corresponding to this device index */
dev = netdev_findbyindex(ifindex);
if (dev == NULL)
{
/* What happened? */
return -ENOENT;
}
/* Copy the device statistics file entry */
dir->fd_dir.d_type = DTYPE_FILE;
strncpy(dir->fd_dir.d_name, dev->d_ifname, 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.
*/
level1->base.index = index + 1;
ret = OK;
}
else
{
/* We are performing a directory search of one of the subdirectories
* and we must let the handler perform the read.
*/
DEBUGASSERT(level1->base.procfsentry != NULL &&
level1->base.procfsentry->ops->readdir != NULL);
ret = level1->base.procfsentry->ops->readdir(dir);
}
return ret;
}
/****************************************************************************
* Name: netprocfs_rewindir
*
* Description: Reset directory read to the first entry
*
****************************************************************************/
static int netprocfs_rewinddir(FAR struct fs_dirent_s *dir)
{
FAR struct netprocfs_level1_s *priv;
DEBUGASSERT(dir && dir->u.procfs);
priv = dir->u.procfs;
priv->base.index = 0;
return OK;
}
/****************************************************************************
* Name: netprocfs_stat
*
* Description: Return information about a file or directory
*
****************************************************************************/
static int netprocfs_stat(FAR const char *relpath, FAR struct stat *buf)
{
/* Check for the directory "net" */
if (strcmp(relpath, "net") == 0 || strcmp(relpath, "net/") == 0)
{
buf->st_mode = S_IFDIR | S_IROTH | S_IRGRP | S_IRUSR;
}
else
#ifdef CONFIG_NET_STATISTICS
/* Check for network statistics "net/stat" */
if (strcmp(relpath, "net/stat") == 0)
{
buf->st_mode = S_IFREG | S_IROTH | S_IRGRP | S_IRUSR;
}
else
#ifdef CONFIG_NET_MLD
/* Check for MLD statistics "net/mld" */
if (strcmp(relpath, "net/mld") == 0)
{
buf->st_mode = S_IFREG | S_IROTH | S_IRGRP | S_IRUSR;
}
else
#endif
#endif
#ifdef CONFIG_NET_ROUTE
/* Check for network statistics "net/stat" */
if (strcmp(relpath, "net/route") == 0)
{
buf->st_mode = S_IFDIR | S_IROTH | S_IRGRP | S_IRUSR;
}
else
#endif
{
FAR struct net_driver_s *dev;
FAR char *devname;
FAR char *copy;
/* Otherwise, we need to search the list of registered network devices
* to determine if the name corresponds to a network device.
*/
copy = strdup(relpath);
if (copy == NULL)
{
ferr("ERROR: strdup failed\n");
return -ENOMEM;
}
devname = basename(copy);
dev = netdev_findbyname(devname);
kmm_free(copy);
if (dev == NULL)
{
ferr("ERROR: relpath is '%s'\n", relpath);
return -ENOENT;
}
buf->st_mode = S_IFREG | S_IROTH | S_IRGRP | S_IRUSR;
}
/* File/directory size, access block size */
buf->st_size = 0;
buf->st_blksize = 0;
buf->st_blocks = 0;
return OK;
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: netprocfs_read_linegen
*
* Description:
* Read and format procfs data using a line generation table.
*
* Input Parameters:
* priv - A reference to the network procfs file structure
* buffer - The user-provided buffer into which device status will be
* returned.
* buflen - The size in bytes of the user provided buffer.
* gentab - Table of line generation functions
* nelems - The number of elements in the table
*
* Returned Value:
* Zero (OK) is returned on success; a negated errno value is returned
* on failure.
*
****************************************************************************/
ssize_t netprocfs_read_linegen(FAR struct netprocfs_file_s *priv,
FAR char *buffer, size_t buflen,
FAR const linegen_t *gentab, int nelems)
{
size_t xfrsize;
ssize_t nreturned;
finfo("buffer=%p buflen=%lu\n", buffer, (unsigned long)buflen);
/* Is there line data already buffered? */
nreturned = 0;
if (priv->linesize > 0)
{
/* Yes, how much can we transfer now? */
xfrsize = priv->linesize;
if (xfrsize > buflen)
{
xfrsize = buflen;
}
/* Transfer the data to the user buffer */
memcpy(buffer, &priv->line[priv->offset], xfrsize);
/* Update pointers, sizes, and offsets */
buffer += xfrsize;
buflen -= xfrsize;
priv->linesize -= xfrsize;
priv->offset += xfrsize;
nreturned = xfrsize;
}
/* Loop until the user buffer is full or until all of the network
* statistics have been transferred. At this point we know that
* either:
*
* 1. The user buffer is full, and/or
* 2. All of the current line data has been transferred.
*/
while (buflen > 0 && priv->lineno < nelems)
{
int len;
/* Read the next line into the working buffer */
len = gentab[priv->lineno](priv);
/* Update line-related information */
priv->lineno++;
priv->linesize = len;
priv->offset = 0;
/* Transfer data to the user buffer */
xfrsize = priv->linesize;
if (xfrsize > buflen)
{
xfrsize = buflen;
}
memcpy(buffer, &priv->line[priv->offset], xfrsize);
/* Update pointers, sizes, and offsets */
buffer += xfrsize;
buflen -= xfrsize;
priv->linesize -= xfrsize;
priv->offset += xfrsize;
nreturned += xfrsize;
}
return nreturned;
}
#endif /* !CONFIG_DISABLE_MOUNTPOINT && CONFIG_FS_PROCFS &&
* !CONFIG_FS_PROCFS_EXCLUDE_NET */
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