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, <[email protected]> coppied from wanproc.c
   8  *               by: Gene Kozin <[email protected]>
   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 /*
  77  * Proc filesystem directory entries.
  78  */
  79
  80 /* Strings */
  81 static const char *const vlan_name_type_str[VLAN_NAME_TYPE_HIGHEST] = {
  82     [VLAN_NAME_TYPE_RAW_PLUS_VID]        = "VLAN_NAME_TYPE_RAW_PLUS_VID",
  83     [VLAN_NAME_TYPE_PLUS_VID_NO_PAD]     = "VLAN_NAME_TYPE_PLUS_VID_NO_PAD",
  84     [VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD] = "VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD",
  85     [VLAN_NAME_TYPE_PLUS_VID]            = "VLAN_NAME_TYPE_PLUS_VID",
  86 };
  87 /*
  88  *      Interface functions
  89  */
  90
  91 /*
  92  *      Clean up /proc/net/vlan entries
  93  */
  94
  95 void vlan_proc_cleanup(struct net *net)
  96 {
  97         struct vlan_net *vn = net_generic(net, vlan_net_id);
  98
  99         if (vn->proc_vlan_conf)
 100                 remove_proc_entry(name_conf, vn->proc_vlan_dir);
 101
 102         if (vn->proc_vlan_dir)
 103                 remove_proc_entry(name_root, net->proc_net);
 104
 105         /* Dynamically added entries should be cleaned up as their vlan_device
 106          * is removed, so we should not have to take care of it here...
 107          */
 108 }
 109
 110 /*
 111  *      Create /proc/net/vlan entries
 112  */
 113
 114 int __net_init vlan_proc_init(struct net *net)
 115 {
 116         struct vlan_net *vn = net_generic(net, vlan_net_id);
 117
 118         vn->proc_vlan_dir = proc_net_mkdir(net, name_root, net->proc_net);
 119         if (!vn->proc_vlan_dir)
 120                 goto err;
 121
 122         vn->proc_vlan_conf = proc_create_net(name_conf, S_IFREG | 0600,
 123                         vn->proc_vlan_dir, &vlan_seq_ops,
 124                         sizeof(struct seq_net_private));
 125         if (!vn->proc_vlan_conf)
 126                 goto err;
 127         return 0;
 128
 129 err:
 130         pr_err("can't create entry in proc filesystem!\n");
 131         vlan_proc_cleanup(net);
 132         return -ENOBUFS;
 133 }
 134
 135 /*
 136  *      Add directory entry for VLAN device.
 137  */
 138
 139 int vlan_proc_add_dev(struct net_device *vlandev)
 140 {
 141         struct vlan_dev_priv *vlan = vlan_dev_priv(vlandev);
 142         struct vlan_net *vn = net_generic(dev_net(vlandev), vlan_net_id);
 143
 144         if (!strcmp(vlandev->name, name_conf))
 145                 return -EINVAL;
 146         vlan->dent = proc_create_single_data(vlandev->name, S_IFREG | 0600,
 147                         vn->proc_vlan_dir, vlandev_seq_show, vlandev);
 148         if (!vlan->dent)
 149                 return -ENOBUFS;
 150         return 0;
 151 }
 152
 153 /*
 154  *      Delete directory entry for VLAN device.
 155  */
 156 void vlan_proc_rem_dev(struct net_device *vlandev)
 157 {
 158         /** NOTE:  This will consume the memory pointed to by dent, it seems. */
 159         proc_remove(vlan_dev_priv(vlandev)->dent);
 160         vlan_dev_priv(vlandev)->dent = NULL;
 161 }
 162
 163 /****** Proc filesystem entry points ****************************************/
 164
 165 /*
 166  * The following few functions build the content of /proc/net/vlan/config
 167  */
 168
 169 /* start read of /proc/net/vlan/config */
 170 static void *vlan_seq_start(struct seq_file *seq, loff_t *pos)
 171         __acquires(rcu)
 172 {
 173         struct net_device *dev;
 174         struct net *net = seq_file_net(seq);
 175         loff_t i = 1;
 176
 177         rcu_read_lock();
 178         if (*pos == 0)
 179                 return SEQ_START_TOKEN;
 180
 181         for_each_netdev_rcu(net, dev) {
 182                 if (!is_vlan_dev(dev))
 183                         continue;
 184
 185                 if (i++ == *pos)
 186                         return dev;
 187         }
 188
 189         return  NULL;
 190 }
 191
 192 static void *vlan_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 193 {
 194         struct net_device *dev;
 195         struct net *net = seq_file_net(seq);
 196
 197         ++*pos;
 198
 199         dev = v;
 200         if (v == SEQ_START_TOKEN)
 201                 dev = net_device_entry(&net->dev_base_head);
 202
 203         for_each_netdev_continue_rcu(net, dev) {
 204                 if (!is_vlan_dev(dev))
 205                         continue;
 206
 207                 return dev;
 208         }
 209
 210         return NULL;
 211 }
 212
 213 static void vlan_seq_stop(struct seq_file *seq, void *v)
 214         __releases(rcu)
 215 {
 216         rcu_read_unlock();
 217 }
 218
 219 static int vlan_seq_show(struct seq_file *seq, void *v)
 220 {
 221         struct net *net = seq_file_net(seq);
 222         struct vlan_net *vn = net_generic(net, vlan_net_id);
 223
 224         if (v == SEQ_START_TOKEN) {
 225                 const char *nmtype = NULL;
 226
 227                 seq_puts(seq, "VLAN Dev name     | VLAN ID\n");
 228
 229                 if (vn->name_type < ARRAY_SIZE(vlan_name_type_str))
 230                     nmtype =  vlan_name_type_str[vn->name_type];
 231
 232                 seq_printf(seq, "Name-Type: %s\n",
 233                            nmtype ? nmtype :  "UNKNOWN");
 234         } else {
 235                 const struct net_device *vlandev = v;
 236                 const struct vlan_dev_priv *vlan = vlan_dev_priv(vlandev);
 237
 238                 seq_printf(seq, "%-15s| %d  | %s\n",  vlandev->name,
 239                            vlan->vlan_id,    vlan->real_dev->name);
 240         }
 241         return 0;
 242 }
 243
 244 static int vlandev_seq_show(struct seq_file *seq, void *offset)
 245 {
 246         struct net_device *vlandev = (struct net_device *) seq->private;
 247         const struct vlan_dev_priv *vlan = vlan_dev_priv(vlandev);
 248         struct rtnl_link_stats64 temp;
 249         const struct rtnl_link_stats64 *stats;
 250         static const char fmt64[] = "%30s %12llu\n";
 251         int i;
 252
 253         if (!is_vlan_dev(vlandev))
 254                 return 0;
 255
 256         stats = dev_get_stats(vlandev, &temp);
 257         seq_printf(seq,
 258                    "%s  VID: %d  REORDER_HDR: %i  dev->priv_flags: %hx\n",
 259                    vlandev->name, vlan->vlan_id,
 260                    (int)(vlan->flags & 1), vlandev->priv_flags);
 261
 262         seq_printf(seq, fmt64, "total frames received", stats->rx_packets);
 263         seq_printf(seq, fmt64, "total bytes received", stats->rx_bytes);
 264         seq_printf(seq, fmt64, "Broadcast/Multicast Rcvd", stats->multicast);
 265         seq_puts(seq, "\n");
 266         seq_printf(seq, fmt64, "total frames transmitted", stats->tx_packets);
 267         seq_printf(seq, fmt64, "total bytes transmitted", stats->tx_bytes);
 268         seq_printf(seq, "Device: %s", vlan->real_dev->name);
 269         /* now show all PRIORITY mappings relating to this VLAN */
 270         seq_printf(seq, "\nINGRESS priority mappings: "
 271                         "0:%u  1:%u  2:%u  3:%u  4:%u  5:%u  6:%u 7:%u\n",
 272                    vlan->ingress_priority_map[0],
 273                    vlan->ingress_priority_map[1],
 274                    vlan->ingress_priority_map[2],
 275                    vlan->ingress_priority_map[3],
 276                    vlan->ingress_priority_map[4],
 277                    vlan->ingress_priority_map[5],
 278                    vlan->ingress_priority_map[6],
 279                    vlan->ingress_priority_map[7]);
 280
 281         seq_printf(seq, " EGRESS priority mappings: ");
 282         for (i = 0; i < 16; i++) {
 283                 const struct vlan_priority_tci_mapping *mp
 284                         = vlan->egress_priority_map[i];
 285                 while (mp) {
 286                         seq_printf(seq, "%u:%hu ",
 287                                    mp->priority, ((mp->vlan_qos >> 13) & 0x7));
 288                         mp = mp->next;
 289                 }
 290         }
 291         seq_puts(seq, "\n");
 292
 293         return 0;
 294 }