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_DATA(inode)); 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 directory 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 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 */ 144 145 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 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 */ 187 void 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 } 193 194 /****** Proc filesystem entry points ****************************************/ 195 196 /* 197 * The following few functions build the content of /proc/net/vlan/config 198 */ 199 200 /* start read of /proc/net/vlan/config */ 201 static void *vlan_seq_start(struct seq_file *seq, loff_t *pos) 202 __acquires(rcu) 203 { 204 struct net_device *dev; 205 struct net *net = seq_file_net(seq); 206 loff_t i = 1; 207 208 rcu_read_lock(); 209 if (*pos == 0) 210 return SEQ_START_TOKEN; 211 212 for_each_netdev_rcu(net, dev) { 213 if (!is_vlan_dev(dev)) 214 continue; 215 216 if (i++ == *pos) 217 return dev; 218 } 219 220 return NULL; 221 } 222 223 static void *vlan_seq_next(struct seq_file *seq, void *v, loff_t *pos) 224 { 225 struct net_device *dev; 226 struct net *net = seq_file_net(seq); 227 228 ++*pos; 229 230 dev = v; 231 if (v == SEQ_START_TOKEN) 232 dev = net_device_entry(&net->dev_base_head); 233 234 for_each_netdev_continue_rcu(net, dev) { 235 if (!is_vlan_dev(dev)) 236 continue; 237 238 return dev; 239 } 240 241 return NULL; 242 } 243 244 static void vlan_seq_stop(struct seq_file *seq, void *v) 245 __releases(rcu) 246 { 247 rcu_read_unlock(); 248 } 249 250 static int vlan_seq_show(struct seq_file *seq, void *v) 251 { 252 struct net *net = seq_file_net(seq); 253 struct vlan_net *vn = net_generic(net, vlan_net_id); 254 255 if (v == SEQ_START_TOKEN) { 256 const char *nmtype = NULL; 257 258 seq_puts(seq, "VLAN Dev name | VLAN ID\n"); 259 260 if (vn->name_type < ARRAY_SIZE(vlan_name_type_str)) 261 nmtype = vlan_name_type_str[vn->name_type]; 262 263 seq_printf(seq, "Name-Type: %s\n", 264 nmtype ? nmtype : "UNKNOWN"); 265 } else { 266 const struct net_device *vlandev = v; 267 const struct vlan_dev_priv *vlan = vlan_dev_priv(vlandev); 268 269 seq_printf(seq, "%-15s| %d | %s\n", vlandev->name, 270 vlan->vlan_id, vlan->real_dev->name); 271 } 272 return 0; 273 } 274 275 static int vlandev_seq_show(struct seq_file *seq, void *offset) 276 { 277 struct net_device *vlandev = (struct net_device *) seq->private; 278 const struct vlan_dev_priv *vlan = vlan_dev_priv(vlandev); 279 struct rtnl_link_stats64 temp; 280 const struct rtnl_link_stats64 *stats; 281 static const char fmt64[] = "%30s %12llu\n"; 282 int i; 283 284 if (!is_vlan_dev(vlandev)) 285 return 0; 286 287 stats = dev_get_stats(vlandev, &temp); 288 seq_printf(seq, 289 "%s VID: %d REORDER_HDR: %i dev->priv_flags: %hx\n", 290 vlandev->name, vlan->vlan_id, 291 (int)(vlan->flags & 1), vlandev->priv_flags); 292 293 seq_printf(seq, fmt64, "total frames received", stats->rx_packets); 294 seq_printf(seq, fmt64, "total bytes received", stats->rx_bytes); 295 seq_printf(seq, fmt64, "Broadcast/Multicast Rcvd", stats->multicast); 296 seq_puts(seq, "\n"); 297 seq_printf(seq, fmt64, "total frames transmitted", stats->tx_packets); 298 seq_printf(seq, fmt64, "total bytes transmitted", stats->tx_bytes); 299 seq_printf(seq, "Device: %s", vlan->real_dev->name); 300 /* now show all PRIORITY mappings relating to this VLAN */ 301 seq_printf(seq, "\nINGRESS priority mappings: " 302 "0:%u 1:%u 2:%u 3:%u 4:%u 5:%u 6:%u 7:%u\n", 303 vlan->ingress_priority_map[0], 304 vlan->ingress_priority_map[1], 305 vlan->ingress_priority_map[2], 306 vlan->ingress_priority_map[3], 307 vlan->ingress_priority_map[4], 308 vlan->ingress_priority_map[5], 309 vlan->ingress_priority_map[6], 310 vlan->ingress_priority_map[7]); 311 312 seq_printf(seq, " EGRESS priority mappings: "); 313 for (i = 0; i < 16; i++) { 314 const struct vlan_priority_tci_mapping *mp 315 = vlan->egress_priority_map[i]; 316 while (mp) { 317 seq_printf(seq, "%u:%hu ", 318 mp->priority, ((mp->vlan_qos >> 13) & 0x7)); 319 mp = mp->next; 320 } 321 } 322 seq_puts(seq, "\n"); 323 324 return 0; 325 } 326