[VLAN]: sparse warning fix
[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 = create_proc_entry(name_conf, S_IFREG|S_IRUSR|S_IWUSR,
165                                            proc_vlan_dir);
166         if (!proc_vlan_conf)
167                 goto err;
168         proc_vlan_conf->proc_fops = &vlan_fops;
169         return 0;
170
171 err:
172         pr_err("%s: can't create entry in proc filesystem!\n", __FUNCTION__);
173         vlan_proc_cleanup();
174         return -ENOBUFS;
175 }
176
177 /*
178  *      Add directory entry for VLAN device.
179  */
180
181 int vlan_proc_add_dev(struct net_device *vlandev)
182 {
183         struct vlan_dev_info *dev_info = vlan_dev_info(vlandev);
184
185         dev_info->dent = create_proc_entry(vlandev->name,
186                                            S_IFREG|S_IRUSR|S_IWUSR,
187                                            proc_vlan_dir);
188         if (!dev_info->dent)
189                 return -ENOBUFS;
190
191         dev_info->dent->proc_fops = &vlandev_fops;
192         dev_info->dent->data = vlandev;
193         return 0;
194 }
195
196 /*
197  *      Delete directory entry for VLAN device.
198  */
199 int vlan_proc_rem_dev(struct net_device *vlandev)
200 {
201         /** NOTE:  This will consume the memory pointed to by dent, it seems. */
202         if (vlan_dev_info(vlandev)->dent) {
203                 remove_proc_entry(vlan_dev_info(vlandev)->dent->name,
204                                   proc_vlan_dir);
205                 vlan_dev_info(vlandev)->dent = NULL;
206         }
207         return 0;
208 }
209
210 /****** Proc filesystem entry points ****************************************/
211
212 /*
213  * The following few functions build the content of /proc/net/vlan/config
214  */
215
216 static inline int is_vlan_dev(struct net_device *dev)
217 {
218         return dev->priv_flags & IFF_802_1Q_VLAN;
219 }
220
221 /* start read of /proc/net/vlan/config */
222 static void *vlan_seq_start(struct seq_file *seq, loff_t *pos)
223         __acquires(dev_base_lock)
224 {
225         struct net_device *dev;
226         loff_t i = 1;
227
228         read_lock(&dev_base_lock);
229
230         if (*pos == 0)
231                 return SEQ_START_TOKEN;
232
233         for_each_netdev(&init_net, dev) {
234                 if (!is_vlan_dev(dev))
235                         continue;
236
237                 if (i++ == *pos)
238                         return dev;
239         }
240
241         return  NULL;
242 }
243
244 static void *vlan_seq_next(struct seq_file *seq, void *v, loff_t *pos)
245 {
246         struct net_device *dev;
247
248         ++*pos;
249
250         dev = (struct net_device *)v;
251         if (v == SEQ_START_TOKEN)
252                 dev = net_device_entry(&init_net.dev_base_head);
253
254         for_each_netdev_continue(&init_net, dev) {
255                 if (!is_vlan_dev(dev))
256                         continue;
257
258                 return dev;
259         }
260
261         return NULL;
262 }
263
264 static void vlan_seq_stop(struct seq_file *seq, void *v)
265         __releases(dev_base_lock)
266 {
267         read_unlock(&dev_base_lock);
268 }
269
270 static int vlan_seq_show(struct seq_file *seq, void *v)
271 {
272         if (v == SEQ_START_TOKEN) {
273                 const char *nmtype = NULL;
274
275                 seq_puts(seq, "VLAN Dev name     | VLAN ID\n");
276
277                 if (vlan_name_type < ARRAY_SIZE(vlan_name_type_str))
278                     nmtype =  vlan_name_type_str[vlan_name_type];
279
280                 seq_printf(seq, "Name-Type: %s\n",
281                            nmtype ? nmtype :  "UNKNOWN");
282         } else {
283                 const struct net_device *vlandev = v;
284                 const struct vlan_dev_info *dev_info = vlan_dev_info(vlandev);
285
286                 seq_printf(seq, "%-15s| %d  | %s\n",  vlandev->name,
287                            dev_info->vlan_id,    dev_info->real_dev->name);
288         }
289         return 0;
290 }
291
292 static int vlandev_seq_show(struct seq_file *seq, void *offset)
293 {
294         struct net_device *vlandev = (struct net_device *) seq->private;
295         const struct vlan_dev_info *dev_info = vlan_dev_info(vlandev);
296         struct net_device_stats *stats = &vlandev->stats;
297         static const char fmt[] = "%30s %12lu\n";
298         int i;
299
300         if (!(vlandev->priv_flags & IFF_802_1Q_VLAN))
301                 return 0;
302
303         seq_printf(seq,
304                    "%s  VID: %d  REORDER_HDR: %i  dev->priv_flags: %hx\n",
305                    vlandev->name, dev_info->vlan_id,
306                    (int)(dev_info->flags & 1), vlandev->priv_flags);
307
308         seq_printf(seq, fmt, "total frames received", stats->rx_packets);
309         seq_printf(seq, fmt, "total bytes received", stats->rx_bytes);
310         seq_printf(seq, fmt, "Broadcast/Multicast Rcvd", stats->multicast);
311         seq_puts(seq, "\n");
312         seq_printf(seq, fmt, "total frames transmitted", stats->tx_packets);
313         seq_printf(seq, fmt, "total bytes transmitted", stats->tx_bytes);
314         seq_printf(seq, fmt, "total headroom inc",
315                    dev_info->cnt_inc_headroom_on_tx);
316         seq_printf(seq, fmt, "total encap on xmit",
317                    dev_info->cnt_encap_on_xmit);
318         seq_printf(seq, "Device: %s", dev_info->real_dev->name);
319         /* now show all PRIORITY mappings relating to this VLAN */
320         seq_printf(seq, "\nINGRESS priority mappings: "
321                         "0:%u  1:%u  2:%u  3:%u  4:%u  5:%u  6:%u 7:%u\n",
322                    dev_info->ingress_priority_map[0],
323                    dev_info->ingress_priority_map[1],
324                    dev_info->ingress_priority_map[2],
325                    dev_info->ingress_priority_map[3],
326                    dev_info->ingress_priority_map[4],
327                    dev_info->ingress_priority_map[5],
328                    dev_info->ingress_priority_map[6],
329                    dev_info->ingress_priority_map[7]);
330
331         seq_printf(seq, "EGRESSS priority Mappings: ");
332         for (i = 0; i < 16; i++) {
333                 const struct vlan_priority_tci_mapping *mp
334                         = dev_info->egress_priority_map[i];
335                 while (mp) {
336                         seq_printf(seq, "%u:%hu ",
337                                    mp->priority, ((mp->vlan_qos >> 13) & 0x7));
338                         mp = mp->next;
339                 }
340         }
341         seq_puts(seq, "\n");
342
343         return 0;
344 }