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 #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 __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("%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 }