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         .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|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("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|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 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 }