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 #include <linux/module.h> 21 #include <linux/errno.h> 22 #include <linux/kernel.h> 23 #include <linux/string.h> 24 #include <linux/proc_fs.h> 25 #include <linux/seq_file.h> 26 #include <linux/fs.h> 27 #include <linux/netdevice.h> 28 #include <linux/if_vlan.h> 29 #include <net/net_namespace.h> 30 #include <net/netns/generic.h> 31 #include "vlanproc.h" 32 #include "vlan.h" 33 34 /****** Function Prototypes *************************************************/ 35 36 /* Methods for preparing data for reading proc entries */ 37 static int vlan_seq_show(struct seq_file *seq, void *v); 38 static void *vlan_seq_start(struct seq_file *seq, loff_t *pos); 39 static void *vlan_seq_next(struct seq_file *seq, void *v, loff_t *pos); 40 static void vlan_seq_stop(struct seq_file *seq, void *); 41 static int vlandev_seq_show(struct seq_file *seq, void *v); 42 43 /* 44 * Global Data 45 */ 46 47 48 /* 49 * Names of the proc directory entries 50 */ 51 52 static const char name_root[] = "vlan"; 53 static const char name_conf[] = "config"; 54 55 /* 56 * Structures for interfacing with the /proc filesystem. 57 * VLAN creates its own directory /proc/net/vlan with the folowing 58 * entries: 59 * config device status/configuration 60 * <device> entry for each device 61 */ 62 63 /* 64 * Generic /proc/net/vlan/<file> file and inode operations 65 */ 66 67 static const struct seq_operations vlan_seq_ops = { 68 .start = vlan_seq_start, 69 .next = vlan_seq_next, 70 .stop = vlan_seq_stop, 71 .show = vlan_seq_show, 72 }; 73 74 static int vlan_seq_open(struct inode *inode, struct file *file) 75 { 76 return seq_open_net(inode, file, &vlan_seq_ops, 77 sizeof(struct seq_net_private)); 78 } 79 80 static const struct file_operations vlan_fops = { 81 .owner = THIS_MODULE, 82 .open = vlan_seq_open, 83 .read = seq_read, 84 .llseek = seq_lseek, 85 .release = seq_release_net, 86 }; 87 88 /* 89 * /proc/net/vlan/<device> file and inode operations 90 */ 91 92 static int vlandev_seq_open(struct inode *inode, struct file *file) 93 { 94 return single_open(file, vlandev_seq_show, PDE(inode)->data); 95 } 96 97 static const struct file_operations vlandev_fops = { 98 .owner = THIS_MODULE, 99 .open = vlandev_seq_open, 100 .read = seq_read, 101 .llseek = seq_lseek, 102 .release = single_release, 103 }; 104 105 /* 106 * Proc filesystem derectory 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 proc_net_remove(net, name_root); 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 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|S_IRUSR|S_IWUSR, 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("%s: can't create entry in proc filesystem!\n", __func__); 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_info *dev_info = vlan_dev_info(vlandev); 170 struct vlan_net *vn = net_generic(dev_net(vlandev), vlan_net_id); 171 172 dev_info->dent = 173 proc_create_data(vlandev->name, S_IFREG|S_IRUSR|S_IWUSR, 174 vn->proc_vlan_dir, &vlandev_fops, vlandev); 175 if (!dev_info->dent) 176 return -ENOBUFS; 177 return 0; 178 } 179 180 /* 181 * Delete directory entry for VLAN device. 182 */ 183 int vlan_proc_rem_dev(struct net_device *vlandev) 184 { 185 struct vlan_net *vn = net_generic(dev_net(vlandev), vlan_net_id); 186 187 /** NOTE: This will consume the memory pointed to by dent, it seems. */ 188 if (vlan_dev_info(vlandev)->dent) { 189 remove_proc_entry(vlan_dev_info(vlandev)->dent->name, 190 vn->proc_vlan_dir); 191 vlan_dev_info(vlandev)->dent = NULL; 192 } 193 return 0; 194 } 195 196 /****** Proc filesystem entry points ****************************************/ 197 198 /* 199 * The following few functions build the content of /proc/net/vlan/config 200 */ 201 202 /* start read of /proc/net/vlan/config */ 203 static void *vlan_seq_start(struct seq_file *seq, loff_t *pos) 204 __acquires(rcu) 205 { 206 struct net_device *dev; 207 struct net *net = seq_file_net(seq); 208 loff_t i = 1; 209 210 rcu_read_lock(); 211 if (*pos == 0) 212 return SEQ_START_TOKEN; 213 214 for_each_netdev_rcu(net, dev) { 215 if (!is_vlan_dev(dev)) 216 continue; 217 218 if (i++ == *pos) 219 return dev; 220 } 221 222 return NULL; 223 } 224 225 static void *vlan_seq_next(struct seq_file *seq, void *v, loff_t *pos) 226 { 227 struct net_device *dev; 228 struct net *net = seq_file_net(seq); 229 230 ++*pos; 231 232 dev = (struct net_device *)v; 233 if (v == SEQ_START_TOKEN) 234 dev = net_device_entry(&net->dev_base_head); 235 236 for_each_netdev_continue_rcu(net, dev) { 237 if (!is_vlan_dev(dev)) 238 continue; 239 240 return dev; 241 } 242 243 return NULL; 244 } 245 246 static void vlan_seq_stop(struct seq_file *seq, void *v) 247 __releases(rcu) 248 { 249 rcu_read_unlock(); 250 } 251 252 static int vlan_seq_show(struct seq_file *seq, void *v) 253 { 254 struct net *net = seq_file_net(seq); 255 struct vlan_net *vn = net_generic(net, vlan_net_id); 256 257 if (v == SEQ_START_TOKEN) { 258 const char *nmtype = NULL; 259 260 seq_puts(seq, "VLAN Dev name | VLAN ID\n"); 261 262 if (vn->name_type < ARRAY_SIZE(vlan_name_type_str)) 263 nmtype = vlan_name_type_str[vn->name_type]; 264 265 seq_printf(seq, "Name-Type: %s\n", 266 nmtype ? nmtype : "UNKNOWN"); 267 } else { 268 const struct net_device *vlandev = v; 269 const struct vlan_dev_info *dev_info = vlan_dev_info(vlandev); 270 271 seq_printf(seq, "%-15s| %d | %s\n", vlandev->name, 272 dev_info->vlan_id, dev_info->real_dev->name); 273 } 274 return 0; 275 } 276 277 static int vlandev_seq_show(struct seq_file *seq, void *offset) 278 { 279 struct net_device *vlandev = (struct net_device *) seq->private; 280 const struct vlan_dev_info *dev_info = vlan_dev_info(vlandev); 281 const struct net_device_stats *stats; 282 static const char fmt[] = "%30s %12lu\n"; 283 int i; 284 285 if (!is_vlan_dev(vlandev)) 286 return 0; 287 288 stats = dev_get_stats(vlandev); 289 seq_printf(seq, 290 "%s VID: %d REORDER_HDR: %i dev->priv_flags: %hx\n", 291 vlandev->name, dev_info->vlan_id, 292 (int)(dev_info->flags & 1), vlandev->priv_flags); 293 294 seq_printf(seq, fmt, "total frames received", stats->rx_packets); 295 seq_printf(seq, fmt, "total bytes received", stats->rx_bytes); 296 seq_printf(seq, fmt, "Broadcast/Multicast Rcvd", stats->multicast); 297 seq_puts(seq, "\n"); 298 seq_printf(seq, fmt, "total frames transmitted", stats->tx_packets); 299 seq_printf(seq, fmt, "total bytes transmitted", stats->tx_bytes); 300 seq_printf(seq, fmt, "total headroom inc", 301 dev_info->cnt_inc_headroom_on_tx); 302 seq_printf(seq, fmt, "total encap on xmit", 303 dev_info->cnt_encap_on_xmit); 304 seq_printf(seq, "Device: %s", dev_info->real_dev->name); 305 /* now show all PRIORITY mappings relating to this VLAN */ 306 seq_printf(seq, "\nINGRESS priority mappings: " 307 "0:%u 1:%u 2:%u 3:%u 4:%u 5:%u 6:%u 7:%u\n", 308 dev_info->ingress_priority_map[0], 309 dev_info->ingress_priority_map[1], 310 dev_info->ingress_priority_map[2], 311 dev_info->ingress_priority_map[3], 312 dev_info->ingress_priority_map[4], 313 dev_info->ingress_priority_map[5], 314 dev_info->ingress_priority_map[6], 315 dev_info->ingress_priority_map[7]); 316 317 seq_printf(seq, " EGRESS priority mappings: "); 318 for (i = 0; i < 16; i++) { 319 const struct vlan_priority_tci_mapping *mp 320 = dev_info->egress_priority_map[i]; 321 while (mp) { 322 seq_printf(seq, "%u:%hu ", 323 mp->priority, ((mp->vlan_qos >> 13) & 0x7)); 324 mp = mp->next; 325 } 326 } 327 seq_puts(seq, "\n"); 328 329 return 0; 330 } 331