Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 2 | * Linux NET3: Multicast List maintenance. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3 | * |
| 4 | * Authors: |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 5 | * Tim Kordas <tjk@nostromo.eeap.cwru.edu> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6 | * Richard Underwood <richard@wuzz.demon.co.uk> |
| 7 | * |
| 8 | * Stir fried together from the IP multicast and CAP patches above |
Alan Cox | 113aa83 | 2008-10-13 19:01:08 -0700 | [diff] [blame] | 9 | * Alan Cox <alan@lxorguk.ukuu.org.uk> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 10 | * |
| 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 Jones | bf0d524 | 2006-09-22 14:00:29 -0700 | [diff] [blame] | 24 | #include <linux/module.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | #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 Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | #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. Biederman | 457c4cb | 2007-09-12 12:01:34 +0200 | [diff] [blame] | 44 | #include <net/net_namespace.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | #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 Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 53 | * Device multicast list maintenance. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | * |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 55 | * 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 Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | * 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 Xu | 932ff27 | 2006-06-09 12:20:56 -0700 | [diff] [blame] | 64 | * We block accesses to device mc filters with netif_tx_lock. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 65 | */ |
| 66 | |
| 67 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | * Delete a device level multicast |
| 69 | */ |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 70 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | int dev_mc_delete(struct net_device *dev, void *addr, int alen, int glbl) |
| 72 | { |
Patrick McHardy | 3fba5a8 | 2007-06-27 01:26:58 -0700 | [diff] [blame] | 73 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 74 | |
David S. Miller | b9e4085 | 2008-07-15 00:15:08 -0700 | [diff] [blame] | 75 | netif_addr_lock_bh(dev); |
Patrick McHardy | 61cbc2f | 2007-06-30 13:35:52 -0700 | [diff] [blame] | 76 | err = __dev_addr_delete(&dev->mc_list, &dev->mc_count, |
| 77 | addr, alen, glbl); |
Patrick McHardy | 3fba5a8 | 2007-06-27 01:26:58 -0700 | [diff] [blame] | 78 | if (!err) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 79 | /* |
Patrick McHardy | 3fba5a8 | 2007-06-27 01:26:58 -0700 | [diff] [blame] | 80 | * We have altered the list, so the card |
| 81 | * loaded filter is now wrong. Fix it |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 82 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 83 | |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 84 | __dev_set_rx_mode(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 85 | } |
David S. Miller | b9e4085 | 2008-07-15 00:15:08 -0700 | [diff] [blame] | 86 | netif_addr_unlock_bh(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 87 | return err; |
| 88 | } |
| 89 | |
| 90 | /* |
| 91 | * Add a device level multicast |
| 92 | */ |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 93 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | int dev_mc_add(struct net_device *dev, void *addr, int alen, int glbl) |
| 95 | { |
Patrick McHardy | 3fba5a8 | 2007-06-27 01:26:58 -0700 | [diff] [blame] | 96 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 97 | |
David S. Miller | b9e4085 | 2008-07-15 00:15:08 -0700 | [diff] [blame] | 98 | netif_addr_lock_bh(dev); |
Jiri Pirko | 6e17d45 | 2010-02-24 22:49:15 +0000 | [diff] [blame] | 99 | if (alen != dev->addr_len) |
Eric Dumazet | 3041f51 | 2010-03-09 19:09:08 +0000 | [diff] [blame] | 100 | err = -EINVAL; |
| 101 | else |
| 102 | err = __dev_addr_add(&dev->mc_list, &dev->mc_count, addr, alen, glbl); |
Patrick McHardy | 61cbc2f | 2007-06-30 13:35:52 -0700 | [diff] [blame] | 103 | if (!err) |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 104 | __dev_set_rx_mode(dev); |
David S. Miller | b9e4085 | 2008-07-15 00:15:08 -0700 | [diff] [blame] | 105 | netif_addr_unlock_bh(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | return err; |
| 107 | } |
| 108 | |
Patrick McHardy | a0a400d | 2007-07-14 18:52:02 -0700 | [diff] [blame] | 109 | /** |
| 110 | * dev_mc_sync - Synchronize device's multicast list to another device |
| 111 | * @to: destination device |
| 112 | * @from: source device |
| 113 | * |
| 114 | * Add newly added addresses to the destination device and release |
| 115 | * addresses that have no users left. The source device must be |
| 116 | * locked by netif_tx_lock_bh. |
| 117 | * |
| 118 | * This function is intended to be called from the dev->set_multicast_list |
Chris Leech | e83a2ea | 2008-01-31 16:53:23 -0800 | [diff] [blame] | 119 | * or dev->set_rx_mode function of layered software devices. |
Patrick McHardy | a0a400d | 2007-07-14 18:52:02 -0700 | [diff] [blame] | 120 | */ |
| 121 | int dev_mc_sync(struct net_device *to, struct net_device *from) |
| 122 | { |
Patrick McHardy | a0a400d | 2007-07-14 18:52:02 -0700 | [diff] [blame] | 123 | int err = 0; |
| 124 | |
David S. Miller | b9e4085 | 2008-07-15 00:15:08 -0700 | [diff] [blame] | 125 | netif_addr_lock_bh(to); |
Chris Leech | e83a2ea | 2008-01-31 16:53:23 -0800 | [diff] [blame] | 126 | err = __dev_addr_sync(&to->mc_list, &to->mc_count, |
| 127 | &from->mc_list, &from->mc_count); |
Patrick McHardy | a0a400d | 2007-07-14 18:52:02 -0700 | [diff] [blame] | 128 | if (!err) |
| 129 | __dev_set_rx_mode(to); |
David S. Miller | b9e4085 | 2008-07-15 00:15:08 -0700 | [diff] [blame] | 130 | netif_addr_unlock_bh(to); |
Patrick McHardy | a0a400d | 2007-07-14 18:52:02 -0700 | [diff] [blame] | 131 | |
| 132 | return err; |
| 133 | } |
| 134 | EXPORT_SYMBOL(dev_mc_sync); |
| 135 | |
| 136 | |
| 137 | /** |
| 138 | * dev_mc_unsync - Remove synchronized addresses from the destination |
| 139 | * device |
| 140 | * @to: destination device |
| 141 | * @from: source device |
| 142 | * |
| 143 | * Remove all addresses that were added to the destination device by |
| 144 | * dev_mc_sync(). This function is intended to be called from the |
| 145 | * dev->stop function of layered software devices. |
| 146 | */ |
| 147 | void dev_mc_unsync(struct net_device *to, struct net_device *from) |
| 148 | { |
David S. Miller | b9e4085 | 2008-07-15 00:15:08 -0700 | [diff] [blame] | 149 | netif_addr_lock_bh(from); |
David S. Miller | e308a5d | 2008-07-15 00:13:44 -0700 | [diff] [blame] | 150 | netif_addr_lock(to); |
Patrick McHardy | a0a400d | 2007-07-14 18:52:02 -0700 | [diff] [blame] | 151 | |
Chris Leech | e83a2ea | 2008-01-31 16:53:23 -0800 | [diff] [blame] | 152 | __dev_addr_unsync(&to->mc_list, &to->mc_count, |
| 153 | &from->mc_list, &from->mc_count); |
Patrick McHardy | a0a400d | 2007-07-14 18:52:02 -0700 | [diff] [blame] | 154 | __dev_set_rx_mode(to); |
| 155 | |
David S. Miller | e308a5d | 2008-07-15 00:13:44 -0700 | [diff] [blame] | 156 | netif_addr_unlock(to); |
David S. Miller | b9e4085 | 2008-07-15 00:15:08 -0700 | [diff] [blame] | 157 | netif_addr_unlock_bh(from); |
Patrick McHardy | a0a400d | 2007-07-14 18:52:02 -0700 | [diff] [blame] | 158 | } |
| 159 | EXPORT_SYMBOL(dev_mc_unsync); |
| 160 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 161 | #ifdef CONFIG_PROC_FS |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 162 | static int dev_mc_seq_show(struct seq_file *seq, void *v) |
| 163 | { |
Patrick McHardy | 3fba5a8 | 2007-06-27 01:26:58 -0700 | [diff] [blame] | 164 | struct dev_addr_list *m; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 165 | struct net_device *dev = v; |
| 166 | |
Pavel Emelyanov | 95a3635 | 2008-02-29 11:44:14 -0800 | [diff] [blame] | 167 | if (v == SEQ_START_TOKEN) |
| 168 | return 0; |
| 169 | |
David S. Miller | b9e4085 | 2008-07-15 00:15:08 -0700 | [diff] [blame] | 170 | netif_addr_lock_bh(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 171 | for (m = dev->mc_list; m; m = m->next) { |
| 172 | int i; |
| 173 | |
| 174 | seq_printf(seq, "%-4d %-15s %-5d %-5d ", dev->ifindex, |
| 175 | dev->name, m->dmi_users, m->dmi_gusers); |
| 176 | |
| 177 | for (i = 0; i < m->dmi_addrlen; i++) |
| 178 | seq_printf(seq, "%02x", m->dmi_addr[i]); |
| 179 | |
| 180 | seq_putc(seq, '\n'); |
| 181 | } |
David S. Miller | b9e4085 | 2008-07-15 00:15:08 -0700 | [diff] [blame] | 182 | netif_addr_unlock_bh(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 183 | return 0; |
| 184 | } |
| 185 | |
Stephen Hemminger | f690808 | 2007-03-12 14:34:29 -0700 | [diff] [blame] | 186 | static const struct seq_operations dev_mc_seq_ops = { |
Pavel Emelyanov | 95a3635 | 2008-02-29 11:44:14 -0800 | [diff] [blame] | 187 | .start = dev_seq_start, |
| 188 | .next = dev_seq_next, |
| 189 | .stop = dev_seq_stop, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 190 | .show = dev_mc_seq_show, |
| 191 | }; |
| 192 | |
| 193 | static int dev_mc_seq_open(struct inode *inode, struct file *file) |
| 194 | { |
Denis V. Lunev | e372c41 | 2007-11-19 22:31:54 -0800 | [diff] [blame] | 195 | return seq_open_net(inode, file, &dev_mc_seq_ops, |
| 196 | sizeof(struct seq_net_private)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 197 | } |
| 198 | |
Arjan van de Ven | 9a32144 | 2007-02-12 00:55:35 -0800 | [diff] [blame] | 199 | static const struct file_operations dev_mc_seq_fops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 200 | .owner = THIS_MODULE, |
| 201 | .open = dev_mc_seq_open, |
| 202 | .read = seq_read, |
| 203 | .llseek = seq_lseek, |
Denis V. Lunev | e372c41 | 2007-11-19 22:31:54 -0800 | [diff] [blame] | 204 | .release = seq_release_net, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 205 | }; |
| 206 | |
| 207 | #endif |
| 208 | |
Pavel Emelyanov | 4665079 | 2007-10-08 20:38:39 -0700 | [diff] [blame] | 209 | static int __net_init dev_mc_net_init(struct net *net) |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 210 | { |
| 211 | if (!proc_net_fops_create(net, "dev_mcast", 0, &dev_mc_seq_fops)) |
| 212 | return -ENOMEM; |
| 213 | return 0; |
| 214 | } |
| 215 | |
Pavel Emelyanov | 4665079 | 2007-10-08 20:38:39 -0700 | [diff] [blame] | 216 | static void __net_exit dev_mc_net_exit(struct net *net) |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 217 | { |
| 218 | proc_net_remove(net, "dev_mcast"); |
| 219 | } |
| 220 | |
Denis V. Lunev | 022cbae | 2007-11-13 03:23:50 -0800 | [diff] [blame] | 221 | static struct pernet_operations __net_initdata dev_mc_net_ops = { |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 222 | .init = dev_mc_net_init, |
| 223 | .exit = dev_mc_net_exit, |
| 224 | }; |
| 225 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 226 | void __init dev_mcast_init(void) |
| 227 | { |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 228 | register_pernet_subsys(&dev_mc_net_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 229 | } |
| 230 | |
| 231 | EXPORT_SYMBOL(dev_mc_add); |
| 232 | EXPORT_SYMBOL(dev_mc_delete); |