blob: 15241cf48af8a8b835a502978e1777c6c2d8ab12 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
YOSHIFUJI Hideaki4ec93ed2007-02-09 23:24:36 +09002 * Linux NET3: Multicast List maintenance.
Linus Torvalds1da177e2005-04-16 15:20:36 -07003 *
4 * Authors:
YOSHIFUJI Hideaki4ec93ed2007-02-09 23:24:36 +09005 * Tim Kordas <tjk@nostromo.eeap.cwru.edu>
Linus Torvalds1da177e2005-04-16 15:20:36 -07006 * Richard Underwood <richard@wuzz.demon.co.uk>
7 *
8 * Stir fried together from the IP multicast and CAP patches above
YOSHIFUJI Hideaki4ec93ed2007-02-09 23:24:36 +09009 * Alan Cox <Alan.Cox@linux.org>
Linus Torvalds1da177e2005-04-16 15:20:36 -070010 *
11 * Fixes:
12 * Alan Cox : Update the device on a real delete
13 * rather than any time but...
14 * Alan Cox : IFF_ALLMULTI support.
15 * Alan Cox : New format set_multicast_list() calls.
16 * Gleb Natapov : Remove dev_mc_lock.
17 *
18 * This program is free software; you can redistribute it and/or
19 * modify it under the terms of the GNU General Public License
20 * as published by the Free Software Foundation; either version
21 * 2 of the License, or (at your option) any later version.
22 */
23
Dave Jonesbf0d5242006-09-22 14:00:29 -070024#include <linux/module.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070025#include <asm/uaccess.h>
26#include <asm/system.h>
27#include <linux/bitops.h>
28#include <linux/types.h>
29#include <linux/kernel.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070030#include <linux/string.h>
31#include <linux/mm.h>
32#include <linux/socket.h>
33#include <linux/sockios.h>
34#include <linux/in.h>
35#include <linux/errno.h>
36#include <linux/interrupt.h>
37#include <linux/if_ether.h>
38#include <linux/inet.h>
39#include <linux/netdevice.h>
40#include <linux/etherdevice.h>
41#include <linux/proc_fs.h>
42#include <linux/seq_file.h>
43#include <linux/init.h>
Eric W. Biederman457c4cb2007-09-12 12:01:34 +020044#include <net/net_namespace.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070045#include <net/ip.h>
46#include <net/route.h>
47#include <linux/skbuff.h>
48#include <net/sock.h>
49#include <net/arp.h>
50
51
52/*
YOSHIFUJI Hideaki4ec93ed2007-02-09 23:24:36 +090053 * Device multicast list maintenance.
Linus Torvalds1da177e2005-04-16 15:20:36 -070054 *
YOSHIFUJI Hideaki4ec93ed2007-02-09 23:24:36 +090055 * This is used both by IP and by the user level maintenance functions.
56 * Unlike BSD we maintain a usage count on a given multicast address so
57 * that a casual user application can add/delete multicasts used by
Linus Torvalds1da177e2005-04-16 15:20:36 -070058 * protocols without doing damage to the protocols when it deletes the
59 * entries. It also helps IP as it tracks overlapping maps.
60 *
61 * Device mc lists are changed by bh at least if IPv6 is enabled,
62 * so that it must be bh protected.
63 *
Herbert Xu932ff272006-06-09 12:20:56 -070064 * We block accesses to device mc filters with netif_tx_lock.
Linus Torvalds1da177e2005-04-16 15:20:36 -070065 */
66
67/*
Linus Torvalds1da177e2005-04-16 15:20:36 -070068 * Delete a device level multicast
69 */
YOSHIFUJI Hideaki4ec93ed2007-02-09 23:24:36 +090070
Linus Torvalds1da177e2005-04-16 15:20:36 -070071int dev_mc_delete(struct net_device *dev, void *addr, int alen, int glbl)
72{
Patrick McHardy3fba5a82007-06-27 01:26:58 -070073 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -070074
Herbert Xu932ff272006-06-09 12:20:56 -070075 netif_tx_lock_bh(dev);
Patrick McHardy61cbc2f2007-06-30 13:35:52 -070076 err = __dev_addr_delete(&dev->mc_list, &dev->mc_count,
77 addr, alen, glbl);
Patrick McHardy3fba5a82007-06-27 01:26:58 -070078 if (!err) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070079 /*
Patrick McHardy3fba5a82007-06-27 01:26:58 -070080 * We have altered the list, so the card
81 * loaded filter is now wrong. Fix it
Linus Torvalds1da177e2005-04-16 15:20:36 -070082 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070083
Patrick McHardy4417da62007-06-27 01:28:10 -070084 __dev_set_rx_mode(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -070085 }
Herbert Xu932ff272006-06-09 12:20:56 -070086 netif_tx_unlock_bh(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -070087 return err;
88}
89
90/*
91 * Add a device level multicast
92 */
YOSHIFUJI Hideaki4ec93ed2007-02-09 23:24:36 +090093
Linus Torvalds1da177e2005-04-16 15:20:36 -070094int dev_mc_add(struct net_device *dev, void *addr, int alen, int glbl)
95{
Patrick McHardy3fba5a82007-06-27 01:26:58 -070096 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -070097
Herbert Xu932ff272006-06-09 12:20:56 -070098 netif_tx_lock_bh(dev);
Patrick McHardy61cbc2f2007-06-30 13:35:52 -070099 err = __dev_addr_add(&dev->mc_list, &dev->mc_count, addr, alen, glbl);
100 if (!err)
Patrick McHardy4417da62007-06-27 01:28:10 -0700101 __dev_set_rx_mode(dev);
Herbert Xu932ff272006-06-09 12:20:56 -0700102 netif_tx_unlock_bh(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103 return err;
104}
105
Patrick McHardya0a400d2007-07-14 18:52:02 -0700106/**
107 * dev_mc_sync - Synchronize device's multicast list to another device
108 * @to: destination device
109 * @from: source device
110 *
111 * Add newly added addresses to the destination device and release
112 * addresses that have no users left. The source device must be
113 * locked by netif_tx_lock_bh.
114 *
115 * This function is intended to be called from the dev->set_multicast_list
116 * function of layered software devices.
117 */
118int dev_mc_sync(struct net_device *to, struct net_device *from)
119{
Benjamin Theryaaa53c42007-08-24 23:12:08 -0700120 struct dev_addr_list *da, *next;
Patrick McHardya0a400d2007-07-14 18:52:02 -0700121 int err = 0;
122
123 netif_tx_lock_bh(to);
Benjamin Theryaaa53c42007-08-24 23:12:08 -0700124 da = from->mc_list;
125 while (da != NULL) {
126 next = da->next;
Patrick McHardya0a400d2007-07-14 18:52:02 -0700127 if (!da->da_synced) {
128 err = __dev_addr_add(&to->mc_list, &to->mc_count,
129 da->da_addr, da->da_addrlen, 0);
130 if (err < 0)
131 break;
132 da->da_synced = 1;
133 da->da_users++;
134 } else if (da->da_users == 1) {
135 __dev_addr_delete(&to->mc_list, &to->mc_count,
136 da->da_addr, da->da_addrlen, 0);
137 __dev_addr_delete(&from->mc_list, &from->mc_count,
138 da->da_addr, da->da_addrlen, 0);
139 }
Benjamin Theryaaa53c42007-08-24 23:12:08 -0700140 da = next;
Patrick McHardya0a400d2007-07-14 18:52:02 -0700141 }
142 if (!err)
143 __dev_set_rx_mode(to);
144 netif_tx_unlock_bh(to);
145
146 return err;
147}
148EXPORT_SYMBOL(dev_mc_sync);
149
150
151/**
152 * dev_mc_unsync - Remove synchronized addresses from the destination
153 * device
154 * @to: destination device
155 * @from: source device
156 *
157 * Remove all addresses that were added to the destination device by
158 * dev_mc_sync(). This function is intended to be called from the
159 * dev->stop function of layered software devices.
160 */
161void dev_mc_unsync(struct net_device *to, struct net_device *from)
162{
Benjamin Theryaaa53c42007-08-24 23:12:08 -0700163 struct dev_addr_list *da, *next;
Patrick McHardya0a400d2007-07-14 18:52:02 -0700164
165 netif_tx_lock_bh(from);
166 netif_tx_lock_bh(to);
167
Benjamin Theryaaa53c42007-08-24 23:12:08 -0700168 da = from->mc_list;
169 while (da != NULL) {
170 next = da->next;
Patrick McHardya0a400d2007-07-14 18:52:02 -0700171 if (!da->da_synced)
172 continue;
173 __dev_addr_delete(&to->mc_list, &to->mc_count,
174 da->da_addr, da->da_addrlen, 0);
175 da->da_synced = 0;
176 __dev_addr_delete(&from->mc_list, &from->mc_count,
177 da->da_addr, da->da_addrlen, 0);
Benjamin Theryaaa53c42007-08-24 23:12:08 -0700178 da = next;
Patrick McHardya0a400d2007-07-14 18:52:02 -0700179 }
180 __dev_set_rx_mode(to);
181
182 netif_tx_unlock_bh(to);
183 netif_tx_unlock_bh(from);
184}
185EXPORT_SYMBOL(dev_mc_unsync);
186
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187#ifdef CONFIG_PROC_FS
188static void *dev_mc_seq_start(struct seq_file *seq, loff_t *pos)
189{
Eric W. Biederman881d9662007-09-17 11:56:21 -0700190 struct net *net = seq->private;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191 struct net_device *dev;
192 loff_t off = 0;
193
194 read_lock(&dev_base_lock);
Eric W. Biederman881d9662007-09-17 11:56:21 -0700195 for_each_netdev(net, dev) {
YOSHIFUJI Hideaki4ec93ed2007-02-09 23:24:36 +0900196 if (off++ == *pos)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197 return dev;
198 }
199 return NULL;
200}
201
202static void *dev_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
203{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204 ++*pos;
Pavel Emelianov7562f872007-05-03 15:13:45 -0700205 return next_net_device((struct net_device *)v);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206}
207
208static void dev_mc_seq_stop(struct seq_file *seq, void *v)
209{
210 read_unlock(&dev_base_lock);
211}
212
213
214static int dev_mc_seq_show(struct seq_file *seq, void *v)
215{
Patrick McHardy3fba5a82007-06-27 01:26:58 -0700216 struct dev_addr_list *m;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217 struct net_device *dev = v;
218
Herbert Xu932ff272006-06-09 12:20:56 -0700219 netif_tx_lock_bh(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220 for (m = dev->mc_list; m; m = m->next) {
221 int i;
222
223 seq_printf(seq, "%-4d %-15s %-5d %-5d ", dev->ifindex,
224 dev->name, m->dmi_users, m->dmi_gusers);
225
226 for (i = 0; i < m->dmi_addrlen; i++)
227 seq_printf(seq, "%02x", m->dmi_addr[i]);
228
229 seq_putc(seq, '\n');
230 }
Herbert Xu932ff272006-06-09 12:20:56 -0700231 netif_tx_unlock_bh(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232 return 0;
233}
234
Stephen Hemmingerf6908082007-03-12 14:34:29 -0700235static const struct seq_operations dev_mc_seq_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236 .start = dev_mc_seq_start,
237 .next = dev_mc_seq_next,
238 .stop = dev_mc_seq_stop,
239 .show = dev_mc_seq_show,
240};
241
242static int dev_mc_seq_open(struct inode *inode, struct file *file)
243{
Eric W. Biederman881d9662007-09-17 11:56:21 -0700244 struct seq_file *seq;
245 int res;
246 res = seq_open(file, &dev_mc_seq_ops);
247 if (!res) {
248 seq = file->private_data;
Eric W. Biederman077130c2007-09-13 09:18:57 +0200249 seq->private = get_proc_net(inode);
250 if (!seq->private) {
251 seq_release(inode, file);
252 res = -ENXIO;
253 }
Eric W. Biederman881d9662007-09-17 11:56:21 -0700254 }
255 return res;
256}
257
258static int dev_mc_seq_release(struct inode *inode, struct file *file)
259{
260 struct seq_file *seq = file->private_data;
261 struct net *net = seq->private;
262 put_net(net);
263 return seq_release(inode, file);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264}
265
Arjan van de Ven9a321442007-02-12 00:55:35 -0800266static const struct file_operations dev_mc_seq_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267 .owner = THIS_MODULE,
268 .open = dev_mc_seq_open,
269 .read = seq_read,
270 .llseek = seq_lseek,
Eric W. Biederman881d9662007-09-17 11:56:21 -0700271 .release = dev_mc_seq_release,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272};
273
274#endif
275
Pavel Emelyanov46650792007-10-08 20:38:39 -0700276static int __net_init dev_mc_net_init(struct net *net)
Eric W. Biederman881d9662007-09-17 11:56:21 -0700277{
278 if (!proc_net_fops_create(net, "dev_mcast", 0, &dev_mc_seq_fops))
279 return -ENOMEM;
280 return 0;
281}
282
Pavel Emelyanov46650792007-10-08 20:38:39 -0700283static void __net_exit dev_mc_net_exit(struct net *net)
Eric W. Biederman881d9662007-09-17 11:56:21 -0700284{
285 proc_net_remove(net, "dev_mcast");
286}
287
Pavel Emelyanov46650792007-10-08 20:38:39 -0700288static struct pernet_operations __net_initdata dev_mc_net_ops = {
Eric W. Biederman881d9662007-09-17 11:56:21 -0700289 .init = dev_mc_net_init,
290 .exit = dev_mc_net_exit,
291};
292
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293void __init dev_mcast_init(void)
294{
Eric W. Biederman881d9662007-09-17 11:56:21 -0700295 register_pernet_subsys(&dev_mc_net_ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296}
297
298EXPORT_SYMBOL(dev_mc_add);
299EXPORT_SYMBOL(dev_mc_delete);