kernel/net/8021q/vlanproc.c

   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 int 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 */
 202 static 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
 224 static 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
 245 static void vlan_seq_stop(struct seq_file *seq, void *v)
 246         __releases(rcu)
 247 {
 248         rcu_read_unlock();
 249 }
 250
 251 static 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
 276 static 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 }