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 |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 9 | * Alan Cox <Alan.Cox@linux.org> |
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> |
| 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 Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 52 | * Device multicast list maintenance. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 53 | * |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 54 | * 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 Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | * 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 Xu | 932ff27 | 2006-06-09 12:20:56 -0700 | [diff] [blame] | 63 | * We block accesses to device mc filters with netif_tx_lock. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 64 | */ |
| 65 | |
| 66 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 67 | * Delete a device level multicast |
| 68 | */ |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 69 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 70 | int dev_mc_delete(struct net_device *dev, void *addr, int alen, int glbl) |
| 71 | { |
Patrick McHardy | 3fba5a8 | 2007-06-27 01:26:58 -0700 | [diff] [blame] | 72 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | |
Herbert Xu | 932ff27 | 2006-06-09 12:20:56 -0700 | [diff] [blame] | 74 | netif_tx_lock_bh(dev); |
Patrick McHardy | 61cbc2f | 2007-06-30 13:35:52 -0700 | [diff] [blame] | 75 | err = __dev_addr_delete(&dev->mc_list, &dev->mc_count, |
| 76 | addr, alen, glbl); |
Patrick McHardy | 3fba5a8 | 2007-06-27 01:26:58 -0700 | [diff] [blame] | 77 | if (!err) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | /* |
Patrick McHardy | 3fba5a8 | 2007-06-27 01:26:58 -0700 | [diff] [blame] | 79 | * We have altered the list, so the card |
| 80 | * loaded filter is now wrong. Fix it |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 81 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 82 | |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 83 | __dev_set_rx_mode(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | } |
Herbert Xu | 932ff27 | 2006-06-09 12:20:56 -0700 | [diff] [blame] | 85 | netif_tx_unlock_bh(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 86 | return err; |
| 87 | } |
| 88 | |
| 89 | /* |
| 90 | * Add a device level multicast |
| 91 | */ |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 92 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | int dev_mc_add(struct net_device *dev, void *addr, int alen, int glbl) |
| 94 | { |
Patrick McHardy | 3fba5a8 | 2007-06-27 01:26:58 -0700 | [diff] [blame] | 95 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 96 | |
Herbert Xu | 932ff27 | 2006-06-09 12:20:56 -0700 | [diff] [blame] | 97 | netif_tx_lock_bh(dev); |
Patrick McHardy | 61cbc2f | 2007-06-30 13:35:52 -0700 | [diff] [blame] | 98 | err = __dev_addr_add(&dev->mc_list, &dev->mc_count, addr, alen, glbl); |
| 99 | if (!err) |
Patrick McHardy | 4417da6 | 2007-06-27 01:28:10 -0700 | [diff] [blame] | 100 | __dev_set_rx_mode(dev); |
Herbert Xu | 932ff27 | 2006-06-09 12:20:56 -0700 | [diff] [blame] | 101 | netif_tx_unlock_bh(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | return err; |
| 103 | } |
| 104 | |
Patrick McHardy | a0a400d | 2007-07-14 18:52:02 -0700 | [diff] [blame^] | 105 | /** |
| 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 | */ |
| 117 | int 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 | } |
| 144 | EXPORT_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 | */ |
| 157 | void 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 | } |
| 178 | EXPORT_SYMBOL(dev_mc_unsync); |
| 179 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 180 | /* |
| 181 | * Discard multicast list when a device is downed |
| 182 | */ |
| 183 | |
| 184 | void dev_mc_discard(struct net_device *dev) |
| 185 | { |
Herbert Xu | 932ff27 | 2006-06-09 12:20:56 -0700 | [diff] [blame] | 186 | netif_tx_lock_bh(dev); |
Patrick McHardy | 3fba5a8 | 2007-06-27 01:26:58 -0700 | [diff] [blame] | 187 | __dev_addr_discard(&dev->mc_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 188 | dev->mc_count = 0; |
Herbert Xu | 932ff27 | 2006-06-09 12:20:56 -0700 | [diff] [blame] | 189 | netif_tx_unlock_bh(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 190 | } |
| 191 | |
| 192 | #ifdef CONFIG_PROC_FS |
| 193 | static void *dev_mc_seq_start(struct seq_file *seq, loff_t *pos) |
| 194 | { |
| 195 | struct net_device *dev; |
| 196 | loff_t off = 0; |
| 197 | |
| 198 | read_lock(&dev_base_lock); |
Pavel Emelianov | 7562f87 | 2007-05-03 15:13:45 -0700 | [diff] [blame] | 199 | for_each_netdev(dev) { |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 200 | if (off++ == *pos) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 201 | return dev; |
| 202 | } |
| 203 | return NULL; |
| 204 | } |
| 205 | |
| 206 | static void *dev_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| 207 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 208 | ++*pos; |
Pavel Emelianov | 7562f87 | 2007-05-03 15:13:45 -0700 | [diff] [blame] | 209 | return next_net_device((struct net_device *)v); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 210 | } |
| 211 | |
| 212 | static void dev_mc_seq_stop(struct seq_file *seq, void *v) |
| 213 | { |
| 214 | read_unlock(&dev_base_lock); |
| 215 | } |
| 216 | |
| 217 | |
| 218 | static int dev_mc_seq_show(struct seq_file *seq, void *v) |
| 219 | { |
Patrick McHardy | 3fba5a8 | 2007-06-27 01:26:58 -0700 | [diff] [blame] | 220 | struct dev_addr_list *m; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 221 | struct net_device *dev = v; |
| 222 | |
Herbert Xu | 932ff27 | 2006-06-09 12:20:56 -0700 | [diff] [blame] | 223 | netif_tx_lock_bh(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 224 | for (m = dev->mc_list; m; m = m->next) { |
| 225 | int i; |
| 226 | |
| 227 | seq_printf(seq, "%-4d %-15s %-5d %-5d ", dev->ifindex, |
| 228 | dev->name, m->dmi_users, m->dmi_gusers); |
| 229 | |
| 230 | for (i = 0; i < m->dmi_addrlen; i++) |
| 231 | seq_printf(seq, "%02x", m->dmi_addr[i]); |
| 232 | |
| 233 | seq_putc(seq, '\n'); |
| 234 | } |
Herbert Xu | 932ff27 | 2006-06-09 12:20:56 -0700 | [diff] [blame] | 235 | netif_tx_unlock_bh(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 236 | return 0; |
| 237 | } |
| 238 | |
Stephen Hemminger | f690808 | 2007-03-12 14:34:29 -0700 | [diff] [blame] | 239 | static const struct seq_operations dev_mc_seq_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 240 | .start = dev_mc_seq_start, |
| 241 | .next = dev_mc_seq_next, |
| 242 | .stop = dev_mc_seq_stop, |
| 243 | .show = dev_mc_seq_show, |
| 244 | }; |
| 245 | |
| 246 | static int dev_mc_seq_open(struct inode *inode, struct file *file) |
| 247 | { |
| 248 | return seq_open(file, &dev_mc_seq_ops); |
| 249 | } |
| 250 | |
Arjan van de Ven | 9a32144 | 2007-02-12 00:55:35 -0800 | [diff] [blame] | 251 | static const struct file_operations dev_mc_seq_fops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 252 | .owner = THIS_MODULE, |
| 253 | .open = dev_mc_seq_open, |
| 254 | .read = seq_read, |
| 255 | .llseek = seq_lseek, |
| 256 | .release = seq_release, |
| 257 | }; |
| 258 | |
| 259 | #endif |
| 260 | |
| 261 | void __init dev_mcast_init(void) |
| 262 | { |
| 263 | proc_net_fops_create("dev_mcast", 0, &dev_mc_seq_fops); |
| 264 | } |
| 265 | |
| 266 | EXPORT_SYMBOL(dev_mc_add); |
| 267 | EXPORT_SYMBOL(dev_mc_delete); |