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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>
44#include <net/ip.h>
45#include <net/route.h>
46#include <linux/skbuff.h>
47#include <net/sock.h>
48#include <net/arp.h>
49
50
51/*
YOSHIFUJI Hideaki4ec93ed2007-02-09 23:24:36 +090052 * Device multicast list maintenance.
Linus Torvalds1da177e2005-04-16 15:20:36 -070053 *
YOSHIFUJI Hideaki4ec93ed2007-02-09 23:24:36 +090054 * This is used both by IP and by the user level maintenance functions.
55 * Unlike BSD we maintain a usage count on a given multicast address so
56 * that a casual user application can add/delete multicasts used by
Linus Torvalds1da177e2005-04-16 15:20:36 -070057 * protocols without doing damage to the protocols when it deletes the
58 * entries. It also helps IP as it tracks overlapping maps.
59 *
60 * Device mc lists are changed by bh at least if IPv6 is enabled,
61 * so that it must be bh protected.
62 *
Herbert Xu932ff272006-06-09 12:20:56 -070063 * We block accesses to device mc filters with netif_tx_lock.
Linus Torvalds1da177e2005-04-16 15:20:36 -070064 */
65
66/*
Linus Torvalds1da177e2005-04-16 15:20:36 -070067 * Delete a device level multicast
68 */
YOSHIFUJI Hideaki4ec93ed2007-02-09 23:24:36 +090069
Linus Torvalds1da177e2005-04-16 15:20:36 -070070int dev_mc_delete(struct net_device *dev, void *addr, int alen, int glbl)
71{
Patrick McHardy3fba5a82007-06-27 01:26:58 -070072 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -070073
Herbert Xu932ff272006-06-09 12:20:56 -070074 netif_tx_lock_bh(dev);
Patrick McHardy61cbc2f2007-06-30 13:35:52 -070075 err = __dev_addr_delete(&dev->mc_list, &dev->mc_count,
76 addr, alen, glbl);
Patrick McHardy3fba5a82007-06-27 01:26:58 -070077 if (!err) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070078 /*
Patrick McHardy3fba5a82007-06-27 01:26:58 -070079 * We have altered the list, so the card
80 * loaded filter is now wrong. Fix it
Linus Torvalds1da177e2005-04-16 15:20:36 -070081 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070082
Patrick McHardy4417da62007-06-27 01:28:10 -070083 __dev_set_rx_mode(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -070084 }
Herbert Xu932ff272006-06-09 12:20:56 -070085 netif_tx_unlock_bh(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -070086 return err;
87}
88
89/*
90 * Add a device level multicast
91 */
YOSHIFUJI Hideaki4ec93ed2007-02-09 23:24:36 +090092
Linus Torvalds1da177e2005-04-16 15:20:36 -070093int dev_mc_add(struct net_device *dev, void *addr, int alen, int glbl)
94{
Patrick McHardy3fba5a82007-06-27 01:26:58 -070095 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -070096
Herbert Xu932ff272006-06-09 12:20:56 -070097 netif_tx_lock_bh(dev);
Patrick McHardy61cbc2f2007-06-30 13:35:52 -070098 err = __dev_addr_add(&dev->mc_list, &dev->mc_count, addr, alen, glbl);
99 if (!err)
Patrick McHardy4417da62007-06-27 01:28:10 -0700100 __dev_set_rx_mode(dev);
Herbert Xu932ff272006-06-09 12:20:56 -0700101 netif_tx_unlock_bh(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102 return err;
103}
104
Patrick McHardya0a400d2007-07-14 18:52:02 -0700105/**
106 * dev_mc_sync - Synchronize device's multicast list to another device
107 * @to: destination device
108 * @from: source device
109 *
110 * Add newly added addresses to the destination device and release
111 * addresses that have no users left. The source device must be
112 * locked by netif_tx_lock_bh.
113 *
114 * This function is intended to be called from the dev->set_multicast_list
115 * function of layered software devices.
116 */
117int dev_mc_sync(struct net_device *to, struct net_device *from)
118{
119 struct dev_addr_list *da;
120 int err = 0;
121
122 netif_tx_lock_bh(to);
123 for (da = from->mc_list; da != NULL; da = da->next) {
124 if (!da->da_synced) {
125 err = __dev_addr_add(&to->mc_list, &to->mc_count,
126 da->da_addr, da->da_addrlen, 0);
127 if (err < 0)
128 break;
129 da->da_synced = 1;
130 da->da_users++;
131 } else if (da->da_users == 1) {
132 __dev_addr_delete(&to->mc_list, &to->mc_count,
133 da->da_addr, da->da_addrlen, 0);
134 __dev_addr_delete(&from->mc_list, &from->mc_count,
135 da->da_addr, da->da_addrlen, 0);
136 }
137 }
138 if (!err)
139 __dev_set_rx_mode(to);
140 netif_tx_unlock_bh(to);
141
142 return err;
143}
144EXPORT_SYMBOL(dev_mc_sync);
145
146
147/**
148 * dev_mc_unsync - Remove synchronized addresses from the destination
149 * device
150 * @to: destination device
151 * @from: source device
152 *
153 * Remove all addresses that were added to the destination device by
154 * dev_mc_sync(). This function is intended to be called from the
155 * dev->stop function of layered software devices.
156 */
157void dev_mc_unsync(struct net_device *to, struct net_device *from)
158{
159 struct dev_addr_list *da;
160
161 netif_tx_lock_bh(from);
162 netif_tx_lock_bh(to);
163
164 for (da = from->mc_list; da != NULL; da = da->next) {
165 if (!da->da_synced)
166 continue;
167 __dev_addr_delete(&to->mc_list, &to->mc_count,
168 da->da_addr, da->da_addrlen, 0);
169 da->da_synced = 0;
170 __dev_addr_delete(&from->mc_list, &from->mc_count,
171 da->da_addr, da->da_addrlen, 0);
172 }
173 __dev_set_rx_mode(to);
174
175 netif_tx_unlock_bh(to);
176 netif_tx_unlock_bh(from);
177}
178EXPORT_SYMBOL(dev_mc_unsync);
179
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180#ifdef CONFIG_PROC_FS
181static void *dev_mc_seq_start(struct seq_file *seq, loff_t *pos)
182{
183 struct net_device *dev;
184 loff_t off = 0;
185
186 read_lock(&dev_base_lock);
Pavel Emelianov7562f872007-05-03 15:13:45 -0700187 for_each_netdev(dev) {
YOSHIFUJI Hideaki4ec93ed2007-02-09 23:24:36 +0900188 if (off++ == *pos)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189 return dev;
190 }
191 return NULL;
192}
193
194static void *dev_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
195{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196 ++*pos;
Pavel Emelianov7562f872007-05-03 15:13:45 -0700197 return next_net_device((struct net_device *)v);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198}
199
200static void dev_mc_seq_stop(struct seq_file *seq, void *v)
201{
202 read_unlock(&dev_base_lock);
203}
204
205
206static int dev_mc_seq_show(struct seq_file *seq, void *v)
207{
Patrick McHardy3fba5a82007-06-27 01:26:58 -0700208 struct dev_addr_list *m;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209 struct net_device *dev = v;
210
Herbert Xu932ff272006-06-09 12:20:56 -0700211 netif_tx_lock_bh(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212 for (m = dev->mc_list; m; m = m->next) {
213 int i;
214
215 seq_printf(seq, "%-4d %-15s %-5d %-5d ", dev->ifindex,
216 dev->name, m->dmi_users, m->dmi_gusers);
217
218 for (i = 0; i < m->dmi_addrlen; i++)
219 seq_printf(seq, "%02x", m->dmi_addr[i]);
220
221 seq_putc(seq, '\n');
222 }
Herbert Xu932ff272006-06-09 12:20:56 -0700223 netif_tx_unlock_bh(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224 return 0;
225}
226
Stephen Hemmingerf6908082007-03-12 14:34:29 -0700227static const struct seq_operations dev_mc_seq_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228 .start = dev_mc_seq_start,
229 .next = dev_mc_seq_next,
230 .stop = dev_mc_seq_stop,
231 .show = dev_mc_seq_show,
232};
233
234static int dev_mc_seq_open(struct inode *inode, struct file *file)
235{
236 return seq_open(file, &dev_mc_seq_ops);
237}
238
Arjan van de Ven9a321442007-02-12 00:55:35 -0800239static const struct file_operations dev_mc_seq_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240 .owner = THIS_MODULE,
241 .open = dev_mc_seq_open,
242 .read = seq_read,
243 .llseek = seq_lseek,
244 .release = seq_release,
245};
246
247#endif
248
249void __init dev_mcast_init(void)
250{
251 proc_net_fops_create("dev_mcast", 0, &dev_mc_seq_fops);
252}
253
254EXPORT_SYMBOL(dev_mc_add);
255EXPORT_SYMBOL(dev_mc_delete);