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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 */
- (void)inet_ntop(AF_INET, &route->target, target, INET_ADDRSTRLEN);
- (void)inet_ntop(AF_INET, &route->netmask, netmask, INET_ADDRSTRLEN);
- (void)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++;
- (void)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;
- }
- (void)inet_ntop(AF_INET6, route->netmask, addr, INET6_ADDRSTRLEN);
- route_sprintf(info, " NETMASK %s\n", addr);
- if (info->totalsize >= info->buflen)
- {
- return 1;
- }
- (void)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 */
- (void)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 */
- (void)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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