SAFE public projects git trees. - safe/jmp/linux-2.6/blob - 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/stddef.h>       /* offsetof(), etc. */
  22 #include <linux/errno.h>        /* return codes */
  23 #include <linux/kernel.h>
  24 #include <linux/slab.h>         /* kmalloc(), kfree() */
  25 #include <linux/mm.h>
  26 #include <linux/string.h>       /* inline mem*, str* functions */
  27 #include <linux/init.h>         /* __initfunc et al. */
  28 #include <asm/byteorder.h>      /* htons(), etc. */
  29 #include <asm/uaccess.h>        /* copy_to_user */
  30 #include <asm/io.h>
  31 #include <linux/proc_fs.h>
  32 #include <linux/seq_file.h>
  33 #include <linux/fs.h>
  34 #include <linux/netdevice.h>
  35 #include <linux/if_vlan.h>
  36 #include <net/net_namespace.h>
  37 #include <net/netns/generic.h>
  38 #include "vlanproc.h"
  39 #include "vlan.h"
  40
  41 /****** Function Prototypes *************************************************/
  42
  43 /* Methods for preparing data for reading proc entries */
  44 static int vlan_seq_show(struct seq_file *seq, void *v);
  45 static void *vlan_seq_start(struct seq_file *seq, loff_t *pos);
  46 static void *vlan_seq_next(struct seq_file *seq, void *v, loff_t *pos);
  47 static void vlan_seq_stop(struct seq_file *seq, void *);
  48 static int vlandev_seq_show(struct seq_file *seq, void *v);
  49
  50 /*
  51  *      Global Data
  52  */
  53
  54
  55 /*
  56  *      Names of the proc directory entries
  57  */
  58
  59 static const char name_root[]    = "vlan";
  60 static const char name_conf[]    = "config";
  61
  62 /*
  63  *      Structures for interfacing with the /proc filesystem.
  64  *      VLAN creates its own directory /proc/net/vlan with the folowing
  65  *      entries:
  66  *      config          device status/configuration
  67  *      <device>        entry for each  device
  68  */
  69
  70 /*
  71  *      Generic /proc/net/vlan/<file> file and inode operations
  72  */
  73
  74 static const struct seq_operations vlan_seq_ops = {
  75         .start = vlan_seq_start,
  76         .next = vlan_seq_next,
  77         .stop = vlan_seq_stop,
  78         .show = vlan_seq_show,
  79 };
  80
  81 static int vlan_seq_open(struct inode *inode, struct file *file)
  82 {
  83         return seq_open(file, &vlan_seq_ops);
  84 }
  85
  86 static const struct file_operations vlan_fops = {
  87         .owner   = THIS_MODULE,
  88         .open    = vlan_seq_open,
  89         .read    = seq_read,
  90         .llseek  = seq_lseek,
  91         .release = seq_release,
  92 };
  93
  94 /*
  95  *      /proc/net/vlan/<device> file and inode operations
  96  */
  97
  98 static int vlandev_seq_open(struct inode *inode, struct file *file)
  99 {
 100         return single_open(file, vlandev_seq_show, PDE(inode)->data);
 101 }
 102
 103 static const struct file_operations vlandev_fops = {
 104         .owner = THIS_MODULE,
 105         .open    = vlandev_seq_open,
 106         .read    = seq_read,
 107         .llseek  = seq_lseek,
 108         .release = single_release,
 109 };
 110
 111 /*
 112  * Proc filesystem derectory entries.
 113  */
 114
 115 /* Strings */
 116 static const char *vlan_name_type_str[VLAN_NAME_TYPE_HIGHEST] = {
 117     [VLAN_NAME_TYPE_RAW_PLUS_VID]        = "VLAN_NAME_TYPE_RAW_PLUS_VID",
 118     [VLAN_NAME_TYPE_PLUS_VID_NO_PAD]     = "VLAN_NAME_TYPE_PLUS_VID_NO_PAD",
 119     [VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD] = "VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD",
 120     [VLAN_NAME_TYPE_PLUS_VID]            = "VLAN_NAME_TYPE_PLUS_VID",
 121 };
 122 /*
 123  *      Interface functions
 124  */
 125
 126 /*
 127  *      Clean up /proc/net/vlan entries
 128  */
 129
 130 void vlan_proc_cleanup(struct net *net)
 131 {
 132         struct vlan_net *vn = net_generic(net, vlan_net_id);
 133
 134         if (vn->proc_vlan_conf)
 135                 remove_proc_entry(name_conf, vn->proc_vlan_dir);
 136
 137         if (vn->proc_vlan_dir)
 138                 proc_net_remove(net, name_root);
 139
 140         /* Dynamically added entries should be cleaned up as their vlan_device
 141          * is removed, so we should not have to take care of it here...
 142          */
 143 }
 144
 145 /*
 146  *      Create /proc/net/vlan entries
 147  */
 148
 149 int vlan_proc_init(struct net *net)
 150 {
 151         struct vlan_net *vn = net_generic(net, vlan_net_id);
 152
 153         vn->proc_vlan_dir = proc_net_mkdir(net, name_root, net->proc_net);
 154         if (!vn->proc_vlan_dir)
 155                 goto err;
 156
 157         vn->proc_vlan_conf = proc_create(name_conf, S_IFREG|S_IRUSR|S_IWUSR,
 158                                      vn->proc_vlan_dir, &vlan_fops);
 159         if (!vn->proc_vlan_conf)
 160                 goto err;
 161         return 0;
 162
 163 err:
 164         pr_err("%s: can't create entry in proc filesystem!\n", __func__);
 165         vlan_proc_cleanup(net);
 166         return -ENOBUFS;
 167 }
 168
 169 /*
 170  *      Add directory entry for VLAN device.
 171  */
 172
 173 int vlan_proc_add_dev(struct net_device *vlandev)
 174 {
 175         struct vlan_dev_info *dev_info = vlan_dev_info(vlandev);
 176         struct vlan_net *vn = net_generic(dev_net(vlandev), vlan_net_id);
 177
 178         dev_info->dent = proc_create(vlandev->name, S_IFREG|S_IRUSR|S_IWUSR,
 179                                      vn->proc_vlan_dir, &vlandev_fops);
 180         if (!dev_info->dent)
 181                 return -ENOBUFS;
 182
 183         dev_info->dent->data = vlandev;
 184         return 0;
 185 }
 186
 187 /*
 188  *      Delete directory entry for VLAN device.
 189  */
 190 int vlan_proc_rem_dev(struct net_device *vlandev)
 191 {
 192         struct vlan_net *vn = net_generic(dev_net(vlandev), vlan_net_id);
 193
 194         /** NOTE:  This will consume the memory pointed to by dent, it seems. */
 195         if (vlan_dev_info(vlandev)->dent) {
 196                 remove_proc_entry(vlan_dev_info(vlandev)->dent->name,
 197                                   vn->proc_vlan_dir);
 198                 vlan_dev_info(vlandev)->dent = NULL;
 199         }
 200         return 0;
 201 }
 202
 203 /****** Proc filesystem entry points ****************************************/
 204
 205 /*
 206  * The following few functions build the content of /proc/net/vlan/config
 207  */
 208
 209 /* start read of /proc/net/vlan/config */
 210 static void *vlan_seq_start(struct seq_file *seq, loff_t *pos)
 211         __acquires(dev_base_lock)
 212 {
 213         struct net_device *dev;
 214         loff_t i = 1;
 215
 216         read_lock(&dev_base_lock);
 217
 218         if (*pos == 0)
 219                 return SEQ_START_TOKEN;
 220
 221         for_each_netdev(&init_net, dev) {
 222                 if (!is_vlan_dev(dev))
 223                         continue;
 224
 225                 if (i++ == *pos)
 226                         return dev;
 227         }
 228
 229         return  NULL;
 230 }
 231
 232 static void *vlan_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 233 {
 234         struct net_device *dev;
 235
 236         ++*pos;
 237
 238         dev = (struct net_device *)v;
 239         if (v == SEQ_START_TOKEN)
 240                 dev = net_device_entry(&init_net.dev_base_head);
 241
 242         for_each_netdev_continue(&init_net, dev) {
 243                 if (!is_vlan_dev(dev))
 244                         continue;
 245
 246                 return dev;
 247         }
 248
 249         return NULL;
 250 }
 251
 252 static void vlan_seq_stop(struct seq_file *seq, void *v)
 253         __releases(dev_base_lock)
 254 {
 255         read_unlock(&dev_base_lock);
 256 }
 257
 258 static int vlan_seq_show(struct seq_file *seq, void *v)
 259 {
 260         if (v == SEQ_START_TOKEN) {
 261                 const char *nmtype = NULL;
 262
 263                 seq_puts(seq, "VLAN Dev name     | VLAN ID\n");
 264
 265                 if (vlan_name_type < ARRAY_SIZE(vlan_name_type_str))
 266                     nmtype =  vlan_name_type_str[vlan_name_type];
 267
 268                 seq_printf(seq, "Name-Type: %s\n",
 269                            nmtype ? nmtype :  "UNKNOWN");
 270         } else {
 271                 const struct net_device *vlandev = v;
 272                 const struct vlan_dev_info *dev_info = vlan_dev_info(vlandev);
 273
 274                 seq_printf(seq, "%-15s| %d  | %s\n",  vlandev->name,
 275                            dev_info->vlan_id,    dev_info->real_dev->name);
 276         }
 277         return 0;
 278 }
 279
 280 static int vlandev_seq_show(struct seq_file *seq, void *offset)
 281 {
 282         struct net_device *vlandev = (struct net_device *) seq->private;
 283         const struct vlan_dev_info *dev_info = vlan_dev_info(vlandev);
 284         struct net_device_stats *stats = &vlandev->stats;
 285         static const char fmt[] = "%30s %12lu\n";
 286         int i;
 287
 288         if (!(vlandev->priv_flags & IFF_802_1Q_VLAN))
 289                 return 0;
 290
 291         seq_printf(seq,
 292                    "%s  VID: %d  REORDER_HDR: %i  dev->priv_flags: %hx\n",
 293                    vlandev->name, dev_info->vlan_id,
 294                    (int)(dev_info->flags & 1), vlandev->priv_flags);
 295
 296         seq_printf(seq, fmt, "total frames received", stats->rx_packets);
 297         seq_printf(seq, fmt, "total bytes received", stats->rx_bytes);
 298         seq_printf(seq, fmt, "Broadcast/Multicast Rcvd", stats->multicast);
 299         seq_puts(seq, "\n");
 300         seq_printf(seq, fmt, "total frames transmitted", stats->tx_packets);
 301         seq_printf(seq, fmt, "total bytes transmitted", stats->tx_bytes);
 302         seq_printf(seq, fmt, "total headroom inc",
 303                    dev_info->cnt_inc_headroom_on_tx);
 304         seq_printf(seq, fmt, "total encap on xmit",
 305                    dev_info->cnt_encap_on_xmit);
 306         seq_printf(seq, "Device: %s", dev_info->real_dev->name);
 307         /* now show all PRIORITY mappings relating to this VLAN */
 308         seq_printf(seq, "\nINGRESS priority mappings: "
 309                         "0:%u  1:%u  2:%u  3:%u  4:%u  5:%u  6:%u 7:%u\n",
 310                    dev_info->ingress_priority_map[0],
 311                    dev_info->ingress_priority_map[1],
 312                    dev_info->ingress_priority_map[2],
 313                    dev_info->ingress_priority_map[3],
 314                    dev_info->ingress_priority_map[4],
 315                    dev_info->ingress_priority_map[5],
 316                    dev_info->ingress_priority_map[6],
 317                    dev_info->ingress_priority_map[7]);
 318
 319         seq_printf(seq, "EGRESSS priority Mappings: ");
 320         for (i = 0; i < 16; i++) {
 321                 const struct vlan_priority_tci_mapping *mp
 322                         = dev_info->egress_priority_map[i];
 323                 while (mp) {
 324                         seq_printf(seq, "%u:%hu ",
 325                                    mp->priority, ((mp->vlan_qos >> 13) & 0x7));
 326                         mp = mp->next;
 327                 }
 328         }
 329         seq_puts(seq, "\n");
 330
 331         return 0;
 332 }