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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);
David S. Millere308a5d2008-07-15 00:13:44 -070076 netif_addr_lock(dev);
Patrick McHardy61cbc2f2007-06-30 13:35:52 -070077 err = __dev_addr_delete(&dev->mc_list, &dev->mc_count,
78 addr, alen, glbl);
Patrick McHardy3fba5a82007-06-27 01:26:58 -070079 if (!err) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070080 /*
Patrick McHardy3fba5a82007-06-27 01:26:58 -070081 * We have altered the list, so the card
82 * loaded filter is now wrong. Fix it
Linus Torvalds1da177e2005-04-16 15:20:36 -070083 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070084
Patrick McHardy4417da62007-06-27 01:28:10 -070085 __dev_set_rx_mode(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -070086 }
David S. Millere308a5d2008-07-15 00:13:44 -070087 netif_addr_unlock(dev);
Herbert Xu932ff272006-06-09 12:20:56 -070088 netif_tx_unlock_bh(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -070089 return err;
90}
91
92/*
93 * Add a device level multicast
94 */
YOSHIFUJI Hideaki4ec93ed2007-02-09 23:24:36 +090095
Linus Torvalds1da177e2005-04-16 15:20:36 -070096int dev_mc_add(struct net_device *dev, void *addr, int alen, int glbl)
97{
Patrick McHardy3fba5a82007-06-27 01:26:58 -070098 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -070099
Herbert Xu932ff272006-06-09 12:20:56 -0700100 netif_tx_lock_bh(dev);
David S. Millere308a5d2008-07-15 00:13:44 -0700101 netif_addr_lock(dev);
Patrick McHardy61cbc2f2007-06-30 13:35:52 -0700102 err = __dev_addr_add(&dev->mc_list, &dev->mc_count, addr, alen, glbl);
103 if (!err)
Patrick McHardy4417da62007-06-27 01:28:10 -0700104 __dev_set_rx_mode(dev);
David S. Millere308a5d2008-07-15 00:13:44 -0700105 netif_addr_unlock(dev);
Herbert Xu932ff272006-06-09 12:20:56 -0700106 netif_tx_unlock_bh(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107 return err;
108}
109
Patrick McHardya0a400d2007-07-14 18:52:02 -0700110/**
111 * dev_mc_sync - Synchronize device's multicast list to another device
112 * @to: destination device
113 * @from: source device
114 *
115 * Add newly added addresses to the destination device and release
116 * addresses that have no users left. The source device must be
117 * locked by netif_tx_lock_bh.
118 *
119 * This function is intended to be called from the dev->set_multicast_list
Chris Leeche83a2ea2008-01-31 16:53:23 -0800120 * or dev->set_rx_mode function of layered software devices.
Patrick McHardya0a400d2007-07-14 18:52:02 -0700121 */
122int dev_mc_sync(struct net_device *to, struct net_device *from)
123{
Patrick McHardya0a400d2007-07-14 18:52:02 -0700124 int err = 0;
125
126 netif_tx_lock_bh(to);
David S. Millere308a5d2008-07-15 00:13:44 -0700127 netif_addr_lock(to);
Chris Leeche83a2ea2008-01-31 16:53:23 -0800128 err = __dev_addr_sync(&to->mc_list, &to->mc_count,
129 &from->mc_list, &from->mc_count);
Patrick McHardya0a400d2007-07-14 18:52:02 -0700130 if (!err)
131 __dev_set_rx_mode(to);
David S. Millere308a5d2008-07-15 00:13:44 -0700132 netif_addr_unlock(to);
Patrick McHardya0a400d2007-07-14 18:52:02 -0700133 netif_tx_unlock_bh(to);
134
135 return err;
136}
137EXPORT_SYMBOL(dev_mc_sync);
138
139
140/**
141 * dev_mc_unsync - Remove synchronized addresses from the destination
142 * device
143 * @to: destination device
144 * @from: source device
145 *
146 * Remove all addresses that were added to the destination device by
147 * dev_mc_sync(). This function is intended to be called from the
148 * dev->stop function of layered software devices.
149 */
150void dev_mc_unsync(struct net_device *to, struct net_device *from)
151{
Patrick McHardya0a400d2007-07-14 18:52:02 -0700152 netif_tx_lock_bh(from);
David S. Millere308a5d2008-07-15 00:13:44 -0700153 netif_addr_lock(from);
Patrick McHardya0a400d2007-07-14 18:52:02 -0700154 netif_tx_lock_bh(to);
David S. Millere308a5d2008-07-15 00:13:44 -0700155 netif_addr_lock(to);
Patrick McHardya0a400d2007-07-14 18:52:02 -0700156
Chris Leeche83a2ea2008-01-31 16:53:23 -0800157 __dev_addr_unsync(&to->mc_list, &to->mc_count,
158 &from->mc_list, &from->mc_count);
Patrick McHardya0a400d2007-07-14 18:52:02 -0700159 __dev_set_rx_mode(to);
160
David S. Millere308a5d2008-07-15 00:13:44 -0700161 netif_addr_unlock(to);
Patrick McHardya0a400d2007-07-14 18:52:02 -0700162 netif_tx_unlock_bh(to);
David S. Millere308a5d2008-07-15 00:13:44 -0700163 netif_addr_unlock(from);
Patrick McHardya0a400d2007-07-14 18:52:02 -0700164 netif_tx_unlock_bh(from);
165}
166EXPORT_SYMBOL(dev_mc_unsync);
167
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168#ifdef CONFIG_PROC_FS
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169static int dev_mc_seq_show(struct seq_file *seq, void *v)
170{
Patrick McHardy3fba5a82007-06-27 01:26:58 -0700171 struct dev_addr_list *m;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172 struct net_device *dev = v;
173
Pavel Emelyanov95a36352008-02-29 11:44:14 -0800174 if (v == SEQ_START_TOKEN)
175 return 0;
176
Herbert Xu932ff272006-06-09 12:20:56 -0700177 netif_tx_lock_bh(dev);
David S. Millere308a5d2008-07-15 00:13:44 -0700178 netif_addr_lock(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179 for (m = dev->mc_list; m; m = m->next) {
180 int i;
181
182 seq_printf(seq, "%-4d %-15s %-5d %-5d ", dev->ifindex,
183 dev->name, m->dmi_users, m->dmi_gusers);
184
185 for (i = 0; i < m->dmi_addrlen; i++)
186 seq_printf(seq, "%02x", m->dmi_addr[i]);
187
188 seq_putc(seq, '\n');
189 }
David S. Millere308a5d2008-07-15 00:13:44 -0700190 netif_addr_unlock(dev);
Herbert Xu932ff272006-06-09 12:20:56 -0700191 netif_tx_unlock_bh(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192 return 0;
193}
194
Stephen Hemmingerf6908082007-03-12 14:34:29 -0700195static const struct seq_operations dev_mc_seq_ops = {
Pavel Emelyanov95a36352008-02-29 11:44:14 -0800196 .start = dev_seq_start,
197 .next = dev_seq_next,
198 .stop = dev_seq_stop,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199 .show = dev_mc_seq_show,
200};
201
202static int dev_mc_seq_open(struct inode *inode, struct file *file)
203{
Denis V. Luneve372c412007-11-19 22:31:54 -0800204 return seq_open_net(inode, file, &dev_mc_seq_ops,
205 sizeof(struct seq_net_private));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206}
207
Arjan van de Ven9a321442007-02-12 00:55:35 -0800208static const struct file_operations dev_mc_seq_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209 .owner = THIS_MODULE,
210 .open = dev_mc_seq_open,
211 .read = seq_read,
212 .llseek = seq_lseek,
Denis V. Luneve372c412007-11-19 22:31:54 -0800213 .release = seq_release_net,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214};
215
216#endif
217
Pavel Emelyanov46650792007-10-08 20:38:39 -0700218static int __net_init dev_mc_net_init(struct net *net)
Eric W. Biederman881d9662007-09-17 11:56:21 -0700219{
220 if (!proc_net_fops_create(net, "dev_mcast", 0, &dev_mc_seq_fops))
221 return -ENOMEM;
222 return 0;
223}
224
Pavel Emelyanov46650792007-10-08 20:38:39 -0700225static void __net_exit dev_mc_net_exit(struct net *net)
Eric W. Biederman881d9662007-09-17 11:56:21 -0700226{
227 proc_net_remove(net, "dev_mcast");
228}
229
Denis V. Lunev022cbae2007-11-13 03:23:50 -0800230static struct pernet_operations __net_initdata dev_mc_net_ops = {
Eric W. Biederman881d9662007-09-17 11:56:21 -0700231 .init = dev_mc_net_init,
232 .exit = dev_mc_net_exit,
233};
234
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235void __init dev_mcast_init(void)
236{
Eric W. Biederman881d9662007-09-17 11:56:21 -0700237 register_pernet_subsys(&dev_mc_net_ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238}
239
240EXPORT_SYMBOL(dev_mc_add);
241EXPORT_SYMBOL(dev_mc_delete);