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 */ 39 static int vlan_seq_show(struct seq_file *seq, void *v); 40 static void *vlan_seq_start(struct seq_file *seq, loff_t *pos); 41 static void *vlan_seq_next(struct seq_file *seq, void *v, loff_t *pos); 42 static void vlan_seq_stop(struct seq_file *seq, void *); 43 static 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 54 static const char name_root[] = "vlan"; 55 static 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 69 static 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 76 static 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 82 static 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 94 static int vlandev_seq_open(struct inode *inode, struct file *file) 95 { 96 return single_open(file, vlandev_seq_show, PDE(inode)->data); 97 } 98 99 static 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 derectory entries. 109 */ 110 111 /* Strings */ 112 static 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 */ 125 126 void 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 proc_net_remove(net, name_root); 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 */ 144 145 int __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; 158 159 err: 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 */ 168 169 int 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 vlan->dent = 175 proc_create_data(vlandev->name, S_IFREG|S_IRUSR|S_IWUSR, 176 vn->proc_vlan_dir, &vlandev_fops, vlandev); 177 if (!vlan->dent) 178 return -ENOBUFS; 179 return 0; 180 } 181 182 /* 183 * Delete directory entry for VLAN device. 184 */ 185 int vlan_proc_rem_dev(struct net_device *vlandev) 186 { 187 struct vlan_net *vn = net_generic(dev_net(vlandev), vlan_net_id); 188 189 /** NOTE: This will consume the memory pointed to by dent, it seems. */ 190 if (vlan_dev_priv(vlandev)->dent) { 191 remove_proc_entry(vlan_dev_priv(vlandev)->dent->name, 192 vn->proc_vlan_dir); 193 vlan_dev_priv(vlandev)->dent = NULL; 194 } 195 return 0; 196 } 197 198 /****** Proc filesystem entry points ****************************************/ 199 200 /* 201 * The following few functions build the content of /proc/net/vlan/config 202 */ 203 204 /* start read of /proc/net/vlan/config */ 205 static void *vlan_seq_start(struct seq_file *seq, loff_t *pos) 206 __acquires(rcu) 207 { 208 struct net_device *dev; 209 struct net *net = seq_file_net(seq); 210 loff_t i = 1; 211 212 rcu_read_lock(); 213 if (*pos == 0) 214 return SEQ_START_TOKEN; 215 216 for_each_netdev_rcu(net, dev) { 217 if (!is_vlan_dev(dev)) 218 continue; 219 220 if (i++ == *pos) 221 return dev; 222 } 223 224 return NULL; 225 } 226 227 static void *vlan_seq_next(struct seq_file *seq, void *v, loff_t *pos) 228 { 229 struct net_device *dev; 230 struct net *net = seq_file_net(seq); 231 232 ++*pos; 233 234 dev = v; 235 if (v == SEQ_START_TOKEN) 236 dev = net_device_entry(&net->dev_base_head); 237 238 for_each_netdev_continue_rcu(net, dev) { 239 if (!is_vlan_dev(dev)) 240 continue; 241 242 return dev; 243 } 244 245 return NULL; 246 } 247 248 static void vlan_seq_stop(struct seq_file *seq, void *v) 249 __releases(rcu) 250 { 251 rcu_read_unlock(); 252 } 253 254 static int vlan_seq_show(struct seq_file *seq, void *v) 255 { 256 struct net *net = seq_file_net(seq); 257 struct vlan_net *vn = net_generic(net, vlan_net_id); 258 259 if (v == SEQ_START_TOKEN) { 260 const char *nmtype = NULL; 261 262 seq_puts(seq, "VLAN Dev name | VLAN ID\n"); 263 264 if (vn->name_type < ARRAY_SIZE(vlan_name_type_str)) 265 nmtype = vlan_name_type_str[vn->name_type]; 266 267 seq_printf(seq, "Name-Type: %s\n", 268 nmtype ? nmtype : "UNKNOWN"); 269 } else { 270 const struct net_device *vlandev = v; 271 const struct vlan_dev_priv *vlan = vlan_dev_priv(vlandev); 272 273 seq_printf(seq, "%-15s| %d | %s\n", vlandev->name, 274 vlan->vlan_id, vlan->real_dev->name); 275 } 276 return 0; 277 } 278 279 static int vlandev_seq_show(struct seq_file *seq, void *offset) 280 { 281 struct net_device *vlandev = (struct net_device *) seq->private; 282 const struct vlan_dev_priv *vlan = vlan_dev_priv(vlandev); 283 struct rtnl_link_stats64 temp; 284 const struct rtnl_link_stats64 *stats; 285 static const char fmt64[] = "%30s %12llu\n"; 286 int i; 287 288 if (!is_vlan_dev(vlandev)) 289 return 0; 290 291 stats = dev_get_stats(vlandev, &temp); 292 seq_printf(seq, 293 "%s VID: %d REORDER_HDR: %i dev->priv_flags: %hx\n", 294 vlandev->name, vlan->vlan_id, 295 (int)(vlan->flags & 1), vlandev->priv_flags); 296 297 seq_printf(seq, fmt64, "total frames received", stats->rx_packets); 298 seq_printf(seq, fmt64, "total bytes received", stats->rx_bytes); 299 seq_printf(seq, fmt64, "Broadcast/Multicast Rcvd", stats->multicast); 300 seq_puts(seq, "\n"); 301 seq_printf(seq, fmt64, "total frames transmitted", stats->tx_packets); 302 seq_printf(seq, fmt64, "total bytes transmitted", stats->tx_bytes); 303 seq_printf(seq, "Device: %s", vlan->real_dev->name); 304 /* now show all PRIORITY mappings relating to this VLAN */ 305 seq_printf(seq, "\nINGRESS priority mappings: " 306 "0:%u 1:%u 2:%u 3:%u 4:%u 5:%u 6:%u 7:%u\n", 307 vlan->ingress_priority_map[0], 308 vlan->ingress_priority_map[1], 309 vlan->ingress_priority_map[2], 310 vlan->ingress_priority_map[3], 311 vlan->ingress_priority_map[4], 312 vlan->ingress_priority_map[5], 313 vlan->ingress_priority_map[6], 314 vlan->ingress_priority_map[7]); 315 316 seq_printf(seq, " EGRESS priority mappings: "); 317 for (i = 0; i < 16; i++) { 318 const struct vlan_priority_tci_mapping *mp 319 = vlan->egress_priority_map[i]; 320 while (mp) { 321 seq_printf(seq, "%u:%hu ", 322 mp->priority, ((mp->vlan_qos >> 13) & 0x7)); 323 mp = mp->next; 324 } 325 } 326 seq_puts(seq, "\n"); 327 328 return 0; 329 } 330