[VLAN]: Proc entry is not renamed when vlan device name changes.
[linux-2.6.git] / 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 "vlanproc.h"
38 #include "vlan.h"
39
40 /****** Function Prototypes *************************************************/
41
42 /* Methods for preparing data for reading proc entries */
43 static int vlan_seq_show(struct seq_file *seq, void *v);
44 static void *vlan_seq_start(struct seq_file *seq, loff_t *pos);
45 static void *vlan_seq_next(struct seq_file *seq, void *v, loff_t *pos);
46 static void vlan_seq_stop(struct seq_file *seq, void *);
47 static int vlandev_seq_show(struct seq_file *seq, void *v);
48
49 /*
50  *      Global Data
51  */
52
53
54 /*
55  *      Names of the proc directory entries
56  */
57
58 static const char name_root[]    = "vlan";
59 static const char name_conf[]    = "config";
60
61 /*
62  *      Structures for interfacing with the /proc filesystem.
63  *      VLAN creates its own directory /proc/net/vlan with the folowing
64  *      entries:
65  *      config          device status/configuration
66  *      <device>        entry for each  device
67  */
68
69 /*
70  *      Generic /proc/net/vlan/<file> file and inode operations
71  */
72
73 static const struct seq_operations vlan_seq_ops = {
74         .start = vlan_seq_start,
75         .next = vlan_seq_next,
76         .stop = vlan_seq_stop,
77         .show = vlan_seq_show,
78 };
79
80 static int vlan_seq_open(struct inode *inode, struct file *file)
81 {
82         return seq_open(file, &vlan_seq_ops);
83 }
84
85 static const struct file_operations vlan_fops = {
86         .owner   = THIS_MODULE,
87         .open    = vlan_seq_open,
88         .read    = seq_read,
89         .llseek  = seq_lseek,
90         .release = seq_release,
91 };
92
93 /*
94  *      /proc/net/vlan/<device> file and inode operations
95  */
96
97 static int vlandev_seq_open(struct inode *inode, struct file *file)
98 {
99         return single_open(file, vlandev_seq_show, PDE(inode)->data);
100 }
101
102 static const struct file_operations vlandev_fops = {
103         .owner = THIS_MODULE,
104         .open    = vlandev_seq_open,
105         .read    = seq_read,
106         .llseek  = seq_lseek,
107         .release = single_release,
108 };
109
110 /*
111  * Proc filesystem derectory entries.
112  */
113
114 /*
115  *      /proc/net/vlan
116  */
117
118 static struct proc_dir_entry *proc_vlan_dir;
119
120 /*
121  *      /proc/net/vlan/config
122  */
123
124 static struct proc_dir_entry *proc_vlan_conf;
125
126 /* Strings */
127 static const char *vlan_name_type_str[VLAN_NAME_TYPE_HIGHEST] = {
128     [VLAN_NAME_TYPE_RAW_PLUS_VID]        = "VLAN_NAME_TYPE_RAW_PLUS_VID",
129     [VLAN_NAME_TYPE_PLUS_VID_NO_PAD]     = "VLAN_NAME_TYPE_PLUS_VID_NO_PAD",
130     [VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD] = "VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD",
131     [VLAN_NAME_TYPE_PLUS_VID]            = "VLAN_NAME_TYPE_PLUS_VID",
132 };
133 /*
134  *      Interface functions
135  */
136
137 /*
138  *      Clean up /proc/net/vlan entries
139  */
140
141 void vlan_proc_cleanup(void)
142 {
143         if (proc_vlan_conf)
144                 remove_proc_entry(name_conf, proc_vlan_dir);
145
146         if (proc_vlan_dir)
147                 proc_net_remove(&init_net, name_root);
148
149         /* Dynamically added entries should be cleaned up as their vlan_device
150          * is removed, so we should not have to take care of it here...
151          */
152 }
153
154 /*
155  *      Create /proc/net/vlan entries
156  */
157
158 int __init vlan_proc_init(void)
159 {
160         proc_vlan_dir = proc_mkdir(name_root, init_net.proc_net);
161         if (!proc_vlan_dir)
162                 goto err;
163
164         proc_vlan_conf = proc_create(name_conf, S_IFREG|S_IRUSR|S_IWUSR,
165                                      proc_vlan_dir, &vlan_fops);
166         if (!proc_vlan_conf)
167                 goto err;
168         return 0;
169
170 err:
171         pr_err("%s: can't create entry in proc filesystem!\n", __FUNCTION__);
172         vlan_proc_cleanup();
173         return -ENOBUFS;
174 }
175
176 /*
177  *      Add directory entry for VLAN device.
178  */
179
180 int vlan_proc_add_dev(struct net_device *vlandev)
181 {
182         struct vlan_dev_info *dev_info = vlan_dev_info(vlandev);
183
184         dev_info->dent = proc_create(vlandev->name, S_IFREG|S_IRUSR|S_IWUSR,
185                                      proc_vlan_dir, &vlandev_fops);
186         if (!dev_info->dent)
187                 return -ENOBUFS;
188
189         dev_info->dent->data = vlandev;
190         return 0;
191 }
192
193 /*
194  *      Delete directory entry for VLAN device.
195  */
196 int vlan_proc_rem_dev(struct net_device *vlandev)
197 {
198         /** NOTE:  This will consume the memory pointed to by dent, it seems. */
199         if (vlan_dev_info(vlandev)->dent) {
200                 remove_proc_entry(vlan_dev_info(vlandev)->dent->name,
201                                   proc_vlan_dir);
202                 vlan_dev_info(vlandev)->dent = NULL;
203         }
204         return 0;
205 }
206
207 /****** Proc filesystem entry points ****************************************/
208
209 /*
210  * The following few functions build the content of /proc/net/vlan/config
211  */
212
213 /* start read of /proc/net/vlan/config */
214 static void *vlan_seq_start(struct seq_file *seq, loff_t *pos)
215         __acquires(dev_base_lock)
216 {
217         struct net_device *dev;
218         loff_t i = 1;
219
220         read_lock(&dev_base_lock);
221
222         if (*pos == 0)
223                 return SEQ_START_TOKEN;
224
225         for_each_netdev(&init_net, dev) {
226                 if (!is_vlan_dev(dev))
227                         continue;
228
229                 if (i++ == *pos)
230                         return dev;
231         }
232
233         return  NULL;
234 }
235
236 static void *vlan_seq_next(struct seq_file *seq, void *v, loff_t *pos)
237 {
238         struct net_device *dev;
239
240         ++*pos;
241
242         dev = (struct net_device *)v;
243         if (v == SEQ_START_TOKEN)
244                 dev = net_device_entry(&init_net.dev_base_head);
245
246         for_each_netdev_continue(&init_net, dev) {
247                 if (!is_vlan_dev(dev))
248                         continue;
249
250                 return dev;
251         }
252
253         return NULL;
254 }
255
256 static void vlan_seq_stop(struct seq_file *seq, void *v)
257         __releases(dev_base_lock)
258 {
259         read_unlock(&dev_base_lock);
260 }
261
262 static int vlan_seq_show(struct seq_file *seq, void *v)
263 {
264         if (v == SEQ_START_TOKEN) {
265                 const char *nmtype = NULL;
266
267                 seq_puts(seq, "VLAN Dev name     | VLAN ID\n");
268
269                 if (vlan_name_type < ARRAY_SIZE(vlan_name_type_str))
270                     nmtype =  vlan_name_type_str[vlan_name_type];
271
272                 seq_printf(seq, "Name-Type: %s\n",
273                            nmtype ? nmtype :  "UNKNOWN");
274         } else {
275                 const struct net_device *vlandev = v;
276                 const struct vlan_dev_info *dev_info = vlan_dev_info(vlandev);
277
278                 seq_printf(seq, "%-15s| %d  | %s\n",  vlandev->name,
279                            dev_info->vlan_id,    dev_info->real_dev->name);
280         }
281         return 0;
282 }
283
284 static int vlandev_seq_show(struct seq_file *seq, void *offset)
285 {
286         struct net_device *vlandev = (struct net_device *) seq->private;
287         const struct vlan_dev_info *dev_info = vlan_dev_info(vlandev);
288         struct net_device_stats *stats = &vlandev->stats;
289         static const char fmt[] = "%30s %12lu\n";
290         int i;
291
292         if (!(vlandev->priv_flags & IFF_802_1Q_VLAN))
293                 return 0;
294
295         seq_printf(seq,
296                    "%s  VID: %d  REORDER_HDR: %i  dev->priv_flags: %hx\n",
297                    vlandev->name, dev_info->vlan_id,
298                    (int)(dev_info->flags & 1), vlandev->priv_flags);
299
300         seq_printf(seq, fmt, "total frames received", stats->rx_packets);
301         seq_printf(seq, fmt, "total bytes received", stats->rx_bytes);
302         seq_printf(seq, fmt, "Broadcast/Multicast Rcvd", stats->multicast);
303         seq_puts(seq, "\n");
304         seq_printf(seq, fmt, "total frames transmitted", stats->tx_packets);
305         seq_printf(seq, fmt, "total bytes transmitted", stats->tx_bytes);
306         seq_printf(seq, fmt, "total headroom inc",
307                    dev_info->cnt_inc_headroom_on_tx);
308         seq_printf(seq, fmt, "total encap on xmit",
309                    dev_info->cnt_encap_on_xmit);
310         seq_printf(seq, "Device: %s", dev_info->real_dev->name);
311         /* now show all PRIORITY mappings relating to this VLAN */
312         seq_printf(seq, "\nINGRESS priority mappings: "
313                         "0:%u  1:%u  2:%u  3:%u  4:%u  5:%u  6:%u 7:%u\n",
314                    dev_info->ingress_priority_map[0],
315                    dev_info->ingress_priority_map[1],
316                    dev_info->ingress_priority_map[2],
317                    dev_info->ingress_priority_map[3],
318                    dev_info->ingress_priority_map[4],
319                    dev_info->ingress_priority_map[5],
320                    dev_info->ingress_priority_map[6],
321                    dev_info->ingress_priority_map[7]);
322
323         seq_printf(seq, "EGRESSS priority Mappings: ");
324         for (i = 0; i < 16; i++) {
325                 const struct vlan_priority_tci_mapping *mp
326                         = dev_info->egress_priority_map[i];
327                 while (mp) {
328                         seq_printf(seq, "%u:%hu ",
329                                    mp->priority, ((mp->vlan_qos >> 13) & 0x7));
330                         mp = mp->next;
331                 }
332         }
333         seq_puts(seq, "\n");
334
335         return 0;
336 }