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 .open = vlan_seq_open, 84 .read = seq_read, 85 .llseek = seq_lseek, 86 .release = seq_release_net, 87 }; 88 89 /* 90 * /proc/net/vlan/<device> file and inode operations 91 */ 92 93 static int vlandev_seq_open(struct inode *inode, struct file *file) 94 { 95 return single_open(file, vlandev_seq_show, PDE_DATA(inode)); 96 } 97 98 static const struct file_operations vlandev_fops = { 99 .open = vlandev_seq_open, 100 .read = seq_read, 101 .llseek = seq_lseek, 102 .release = single_release, 103 }; 104 105 /* 106 * Proc filesystem directory entries. 107 */ 108 109 /* Strings */ 110 static const char *const vlan_name_type_str[VLAN_NAME_TYPE_HIGHEST] = { 111 [VLAN_NAME_TYPE_RAW_PLUS_VID] = "VLAN_NAME_TYPE_RAW_PLUS_VID", 112 [VLAN_NAME_TYPE_PLUS_VID_NO_PAD] = "VLAN_NAME_TYPE_PLUS_VID_NO_PAD", 113 [VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD] = "VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD", 114 [VLAN_NAME_TYPE_PLUS_VID] = "VLAN_NAME_TYPE_PLUS_VID", 115 }; 116 /* 117 * Interface functions 118 */ 119 120 /* 121 * Clean up /proc/net/vlan entries 122 */ 123 124 void vlan_proc_cleanup(struct net *net) 125 { 126 struct vlan_net *vn = net_generic(net, vlan_net_id); 127 128 if (vn->proc_vlan_conf) 129 remove_proc_entry(name_conf, vn->proc_vlan_dir); 130 131 if (vn->proc_vlan_dir) 132 remove_proc_entry(name_root, net->proc_net); 133 134 /* Dynamically added entries should be cleaned up as their vlan_device 135 * is removed, so we should not have to take care of it here... 136 */ 137 } 138 139 /* 140 * Create /proc/net/vlan entries 141 */ 142 143 int __net_init vlan_proc_init(struct net *net) 144 { 145 struct vlan_net *vn = net_generic(net, vlan_net_id); 146 147 vn->proc_vlan_dir = proc_net_mkdir(net, name_root, net->proc_net); 148 if (!vn->proc_vlan_dir) 149 goto err; 150 151 vn->proc_vlan_conf = proc_create(name_conf, S_IFREG | 0600, 152 vn->proc_vlan_dir, &vlan_fops); 153 if (!vn->proc_vlan_conf) 154 goto err; 155 return 0; 156 157 err: 158 pr_err("can't create entry in proc filesystem!\n"); 159 vlan_proc_cleanup(net); 160 return -ENOBUFS; 161 } 162 163 /* 164 * Add directory entry for VLAN device. 165 */ 166 167 int vlan_proc_add_dev(struct net_device *vlandev) 168 { 169 struct vlan_dev_priv *vlan = vlan_dev_priv(vlandev); 170 struct vlan_net *vn = net_generic(dev_net(vlandev), vlan_net_id); 171 172 if (!strcmp(vlandev->name, name_conf)) 173 return -EINVAL; 174 vlan->dent = 175 proc_create_data(vlandev->name, S_IFREG | 0600, 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 void vlan_proc_rem_dev(struct net_device *vlandev) 186 { 187 /** NOTE: This will consume the memory pointed to by dent, it seems. */ 188 proc_remove(vlan_dev_priv(vlandev)->dent); 189 vlan_dev_priv(vlandev)->dent = NULL; 190 } 191 192 /****** Proc filesystem entry points ****************************************/ 193 194 /* 195 * The following few functions build the content of /proc/net/vlan/config 196 */ 197 198 /* start read of /proc/net/vlan/config */ 199 static void *vlan_seq_start(struct seq_file *seq, loff_t *pos) 200 __acquires(rcu) 201 { 202 struct net_device *dev; 203 struct net *net = seq_file_net(seq); 204 loff_t i = 1; 205 206 rcu_read_lock(); 207 if (*pos == 0) 208 return SEQ_START_TOKEN; 209 210 for_each_netdev_rcu(net, dev) { 211 if (!is_vlan_dev(dev)) 212 continue; 213 214 if (i++ == *pos) 215 return dev; 216 } 217 218 return NULL; 219 } 220 221 static void *vlan_seq_next(struct seq_file *seq, void *v, loff_t *pos) 222 { 223 struct net_device *dev; 224 struct net *net = seq_file_net(seq); 225 226 ++*pos; 227 228 dev = v; 229 if (v == SEQ_START_TOKEN) 230 dev = net_device_entry(&net->dev_base_head); 231 232 for_each_netdev_continue_rcu(net, dev) { 233 if (!is_vlan_dev(dev)) 234 continue; 235 236 return dev; 237 } 238 239 return NULL; 240 } 241 242 static void vlan_seq_stop(struct seq_file *seq, void *v) 243 __releases(rcu) 244 { 245 rcu_read_unlock(); 246 } 247 248 static int vlan_seq_show(struct seq_file *seq, void *v) 249 { 250 struct net *net = seq_file_net(seq); 251 struct vlan_net *vn = net_generic(net, vlan_net_id); 252 253 if (v == SEQ_START_TOKEN) { 254 const char *nmtype = NULL; 255 256 seq_puts(seq, "VLAN Dev name | VLAN ID\n"); 257 258 if (vn->name_type < ARRAY_SIZE(vlan_name_type_str)) 259 nmtype = vlan_name_type_str[vn->name_type]; 260 261 seq_printf(seq, "Name-Type: %s\n", 262 nmtype ? nmtype : "UNKNOWN"); 263 } else { 264 const struct net_device *vlandev = v; 265 const struct vlan_dev_priv *vlan = vlan_dev_priv(vlandev); 266 267 seq_printf(seq, "%-15s| %d | %s\n", vlandev->name, 268 vlan->vlan_id, vlan->real_dev->name); 269 } 270 return 0; 271 } 272 273 static int vlandev_seq_show(struct seq_file *seq, void *offset) 274 { 275 struct net_device *vlandev = (struct net_device *) seq->private; 276 const struct vlan_dev_priv *vlan = vlan_dev_priv(vlandev); 277 struct rtnl_link_stats64 temp; 278 const struct rtnl_link_stats64 *stats; 279 static const char fmt64[] = "%30s %12llu\n"; 280 int i; 281 282 if (!is_vlan_dev(vlandev)) 283 return 0; 284 285 stats = dev_get_stats(vlandev, &temp); 286 seq_printf(seq, 287 "%s VID: %d REORDER_HDR: %i dev->priv_flags: %hx\n", 288 vlandev->name, vlan->vlan_id, 289 (int)(vlan->flags & 1), vlandev->priv_flags); 290 291 seq_printf(seq, fmt64, "total frames received", stats->rx_packets); 292 seq_printf(seq, fmt64, "total bytes received", stats->rx_bytes); 293 seq_printf(seq, fmt64, "Broadcast/Multicast Rcvd", stats->multicast); 294 seq_puts(seq, "\n"); 295 seq_printf(seq, fmt64, "total frames transmitted", stats->tx_packets); 296 seq_printf(seq, fmt64, "total bytes transmitted", stats->tx_bytes); 297 seq_printf(seq, "Device: %s", vlan->real_dev->name); 298 /* now show all PRIORITY mappings relating to this VLAN */ 299 seq_printf(seq, "\nINGRESS priority mappings: " 300 "0:%u 1:%u 2:%u 3:%u 4:%u 5:%u 6:%u 7:%u\n", 301 vlan->ingress_priority_map[0], 302 vlan->ingress_priority_map[1], 303 vlan->ingress_priority_map[2], 304 vlan->ingress_priority_map[3], 305 vlan->ingress_priority_map[4], 306 vlan->ingress_priority_map[5], 307 vlan->ingress_priority_map[6], 308 vlan->ingress_priority_map[7]); 309 310 seq_printf(seq, " EGRESS priority mappings: "); 311 for (i = 0; i < 16; i++) { 312 const struct vlan_priority_tci_mapping *mp 313 = vlan->egress_priority_map[i]; 314 while (mp) { 315 seq_printf(seq, "%u:%hu ", 316 mp->priority, ((mp->vlan_qos >> 13) & 0x7)); 317 mp = mp->next; 318 } 319 } 320 seq_puts(seq, "\n"); 321 322 return 0; 323 } 324