1/****************************************************************************** 2 * vlanproc.c VLAN Module. /proc filesystem interface. 3 * 4 * This module is completely hardware-independent and provides 5 * access to the router using Linux /proc filesystem. 6 * 7 * Author: Ben Greear, <greearb@candelatech.com> coppied from wanproc.c 8 * by: Gene Kozin <genek@compuserve.com> 9 * 10 * Copyright: (c) 1998 Ben Greear 11 * 12 * This program is free software; you can redistribute it and/or 13 * modify it under the terms of the GNU General Public License 14 * as published by the Free Software Foundation; either version 15 * 2 of the License, or (at your option) any later version. 16 * ============================================================================ 17 * Jan 20, 1998 Ben Greear Initial Version 18 *****************************************************************************/ 19 20#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 21 22#include <linux/module.h> 23#include <linux/errno.h> 24#include <linux/kernel.h> 25#include <linux/string.h> 26#include <linux/proc_fs.h> 27#include <linux/seq_file.h> 28#include <linux/fs.h> 29#include <linux/netdevice.h> 30#include <linux/if_vlan.h> 31#include <net/net_namespace.h> 32#include <net/netns/generic.h> 33#include "vlanproc.h" 34#include "vlan.h" 35 36/****** Function Prototypes *************************************************/ 37 38/* Methods for preparing data for reading proc entries */ 39static int vlan_seq_show(struct seq_file *seq, void *v); 40static void *vlan_seq_start(struct seq_file *seq, loff_t *pos); 41static void *vlan_seq_next(struct seq_file *seq, void *v, loff_t *pos); 42static void vlan_seq_stop(struct seq_file *seq, void *); 43static int vlandev_seq_show(struct seq_file *seq, void *v); 44 45/* 46 * Global Data 47 */ 48 49 50/* 51 * Names of the proc directory entries 52 */ 53 54static const char name_root[] = "vlan"; 55static const char name_conf[] = "config"; 56 57/* 58 * Structures for interfacing with the /proc filesystem. 59 * VLAN creates its own directory /proc/net/vlan with the following 60 * entries: 61 * config device status/configuration 62 * <device> entry for each device 63 */ 64 65/* 66 * Generic /proc/net/vlan/<file> file and inode operations 67 */ 68 69static const struct seq_operations vlan_seq_ops = { 70 .start = vlan_seq_start, 71 .next = vlan_seq_next, 72 .stop = vlan_seq_stop, 73 .show = vlan_seq_show, 74}; 75 76static int vlan_seq_open(struct inode *inode, struct file *file) 77{ 78 return seq_open_net(inode, file, &vlan_seq_ops, 79 sizeof(struct seq_net_private)); 80} 81 82static const struct file_operations vlan_fops = { 83 .owner = THIS_MODULE, 84 .open = vlan_seq_open, 85 .read = seq_read, 86 .llseek = seq_lseek, 87 .release = seq_release_net, 88}; 89 90/* 91 * /proc/net/vlan/<device> file and inode operations 92 */ 93 94static int vlandev_seq_open(struct inode *inode, struct file *file) 95{ 96 return single_open(file, vlandev_seq_show, PDE_DATA(inode)); 97} 98 99static const struct file_operations vlandev_fops = { 100 .owner = THIS_MODULE, 101 .open = vlandev_seq_open, 102 .read = seq_read, 103 .llseek = seq_lseek, 104 .release = single_release, 105}; 106 107/* 108 * Proc filesystem directory entries. 109 */ 110 111/* Strings */ 112static const char *const vlan_name_type_str[VLAN_NAME_TYPE_HIGHEST] = { 113 [VLAN_NAME_TYPE_RAW_PLUS_VID] = "VLAN_NAME_TYPE_RAW_PLUS_VID", 114 [VLAN_NAME_TYPE_PLUS_VID_NO_PAD] = "VLAN_NAME_TYPE_PLUS_VID_NO_PAD", 115 [VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD] = "VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD", 116 [VLAN_NAME_TYPE_PLUS_VID] = "VLAN_NAME_TYPE_PLUS_VID", 117}; 118/* 119 * Interface functions 120 */ 121 122/* 123 * Clean up /proc/net/vlan entries 124 */ 125 126void vlan_proc_cleanup(struct net *net) 127{ 128 struct vlan_net *vn = net_generic(net, vlan_net_id); 129 130 if (vn->proc_vlan_conf) 131 remove_proc_entry(name_conf, vn->proc_vlan_dir); 132 133 if (vn->proc_vlan_dir) 134 remove_proc_entry(name_root, net->proc_net); 135 136 /* Dynamically added entries should be cleaned up as their vlan_device 137 * is removed, so we should not have to take care of it here... 138 */ 139} 140 141/* 142 * Create /proc/net/vlan entries 143 */ 144 145int __net_init vlan_proc_init(struct net *net) 146{ 147 struct vlan_net *vn = net_generic(net, vlan_net_id); 148 149 vn->proc_vlan_dir = proc_net_mkdir(net, name_root, net->proc_net); 150 if (!vn->proc_vlan_dir) 151 goto err; 152 153 vn->proc_vlan_conf = proc_create(name_conf, S_IFREG|S_IRUSR|S_IWUSR, 154 vn->proc_vlan_dir, &vlan_fops); 155 if (!vn->proc_vlan_conf) 156 goto err; 157 return 0; 158 159err: 160 pr_err("can't create entry in proc filesystem!\n"); 161 vlan_proc_cleanup(net); 162 return -ENOBUFS; 163} 164 165/* 166 * Add directory entry for VLAN device. 167 */ 168 169int vlan_proc_add_dev(struct net_device *vlandev) 170{ 171 struct vlan_dev_priv *vlan = vlan_dev_priv(vlandev); 172 struct vlan_net *vn = net_generic(dev_net(vlandev), vlan_net_id); 173 174 if (!strcmp(vlandev->name, name_conf)) 175 return -EINVAL; 176 vlan->dent = 177 proc_create_data(vlandev->name, S_IFREG|S_IRUSR|S_IWUSR, 178 vn->proc_vlan_dir, &vlandev_fops, vlandev); 179 if (!vlan->dent) 180 return -ENOBUFS; 181 return 0; 182} 183 184/* 185 * Delete directory entry for VLAN device. 186 */ 187int vlan_proc_rem_dev(struct net_device *vlandev) 188{ 189 /** NOTE: This will consume the memory pointed to by dent, it seems. */ 190 proc_remove(vlan_dev_priv(vlandev)->dent); 191 vlan_dev_priv(vlandev)->dent = NULL; 192 return 0; 193} 194 195/****** Proc filesystem entry points ****************************************/ 196 197/* 198 * The following few functions build the content of /proc/net/vlan/config 199 */ 200 201/* start read of /proc/net/vlan/config */ 202static void *vlan_seq_start(struct seq_file *seq, loff_t *pos) 203 __acquires(rcu) 204{ 205 struct net_device *dev; 206 struct net *net = seq_file_net(seq); 207 loff_t i = 1; 208 209 rcu_read_lock(); 210 if (*pos == 0) 211 return SEQ_START_TOKEN; 212 213 for_each_netdev_rcu(net, dev) { 214 if (!is_vlan_dev(dev)) 215 continue; 216 217 if (i++ == *pos) 218 return dev; 219 } 220 221 return NULL; 222} 223 224static void *vlan_seq_next(struct seq_file *seq, void *v, loff_t *pos) 225{ 226 struct net_device *dev; 227 struct net *net = seq_file_net(seq); 228 229 ++*pos; 230 231 dev = v; 232 if (v == SEQ_START_TOKEN) 233 dev = net_device_entry(&net->dev_base_head); 234 235 for_each_netdev_continue_rcu(net, dev) { 236 if (!is_vlan_dev(dev)) 237 continue; 238 239 return dev; 240 } 241 242 return NULL; 243} 244 245static void vlan_seq_stop(struct seq_file *seq, void *v) 246 __releases(rcu) 247{ 248 rcu_read_unlock(); 249} 250 251static int vlan_seq_show(struct seq_file *seq, void *v) 252{ 253 struct net *net = seq_file_net(seq); 254 struct vlan_net *vn = net_generic(net, vlan_net_id); 255 256 if (v == SEQ_START_TOKEN) { 257 const char *nmtype = NULL; 258 259 seq_puts(seq, "VLAN Dev name | VLAN ID\n"); 260 261 if (vn->name_type < ARRAY_SIZE(vlan_name_type_str)) 262 nmtype = vlan_name_type_str[vn->name_type]; 263 264 seq_printf(seq, "Name-Type: %s\n", 265 nmtype ? nmtype : "UNKNOWN"); 266 } else { 267 const struct net_device *vlandev = v; 268 const struct vlan_dev_priv *vlan = vlan_dev_priv(vlandev); 269 270 seq_printf(seq, "%-15s| %d | %s\n", vlandev->name, 271 vlan->vlan_id, vlan->real_dev->name); 272 } 273 return 0; 274} 275 276static int vlandev_seq_show(struct seq_file *seq, void *offset) 277{ 278 struct net_device *vlandev = (struct net_device *) seq->private; 279 const struct vlan_dev_priv *vlan = vlan_dev_priv(vlandev); 280 struct rtnl_link_stats64 temp; 281 const struct rtnl_link_stats64 *stats; 282 static const char fmt64[] = "%30s %12llu\n"; 283 int i; 284 285 if (!is_vlan_dev(vlandev)) 286 return 0; 287 288 stats = dev_get_stats(vlandev, &temp); 289 seq_printf(seq, 290 "%s VID: %d REORDER_HDR: %i dev->priv_flags: %hx\n", 291 vlandev->name, vlan->vlan_id, 292 (int)(vlan->flags & 1), vlandev->priv_flags); 293 294 seq_printf(seq, fmt64, "total frames received", stats->rx_packets); 295 seq_printf(seq, fmt64, "total bytes received", stats->rx_bytes); 296 seq_printf(seq, fmt64, "Broadcast/Multicast Rcvd", stats->multicast); 297 seq_puts(seq, "\n"); 298 seq_printf(seq, fmt64, "total frames transmitted", stats->tx_packets); 299 seq_printf(seq, fmt64, "total bytes transmitted", stats->tx_bytes); 300 seq_printf(seq, "Device: %s", vlan->real_dev->name); 301 /* now show all PRIORITY mappings relating to this VLAN */ 302 seq_printf(seq, "\nINGRESS priority mappings: " 303 "0:%u 1:%u 2:%u 3:%u 4:%u 5:%u 6:%u 7:%u\n", 304 vlan->ingress_priority_map[0], 305 vlan->ingress_priority_map[1], 306 vlan->ingress_priority_map[2], 307 vlan->ingress_priority_map[3], 308 vlan->ingress_priority_map[4], 309 vlan->ingress_priority_map[5], 310 vlan->ingress_priority_map[6], 311 vlan->ingress_priority_map[7]); 312 313 seq_printf(seq, " EGRESS priority mappings: "); 314 for (i = 0; i < 16; i++) { 315 const struct vlan_priority_tci_mapping *mp 316 = vlan->egress_priority_map[i]; 317 while (mp) { 318 seq_printf(seq, "%u:%hu ", 319 mp->priority, ((mp->vlan_qos >> 13) & 0x7)); 320 mp = mp->next; 321 } 322 } 323 seq_puts(seq, "\n"); 324 325 return 0; 326} 327