Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Userspace interface |
| 3 | * Linux ethernet bridge |
| 4 | * |
| 5 | * Authors: |
| 6 | * Lennert Buytenhek <buytenh@gnu.org> |
| 7 | * |
| 8 | * $Id: br_if.c,v 1.7 2001/12/24 00:59:55 davem Exp $ |
| 9 | * |
| 10 | * This program is free software; you can redistribute it and/or |
| 11 | * modify it under the terms of the GNU General Public License |
| 12 | * as published by the Free Software Foundation; either version |
| 13 | * 2 of the License, or (at your option) any later version. |
| 14 | */ |
| 15 | |
| 16 | #include <linux/kernel.h> |
| 17 | #include <linux/netdevice.h> |
| 18 | #include <linux/ethtool.h> |
| 19 | #include <linux/if_arp.h> |
| 20 | #include <linux/module.h> |
| 21 | #include <linux/init.h> |
| 22 | #include <linux/rtnetlink.h> |
Kris Katterjohn | 46f25df | 2006-01-05 16:35:42 -0800 | [diff] [blame] | 23 | #include <linux/if_ether.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | #include <net/sock.h> |
| 25 | |
| 26 | #include "br_private.h" |
| 27 | |
| 28 | /* |
| 29 | * Determine initial path cost based on speed. |
| 30 | * using recommendations from 802.1d standard |
| 31 | * |
| 32 | * Need to simulate user ioctl because not all device's that support |
| 33 | * ethtool, use ethtool_ops. Also, since driver might sleep need to |
| 34 | * not be holding any locks. |
| 35 | */ |
Stephen Hemminger | 4433f42 | 2005-12-20 15:19:51 -0800 | [diff] [blame] | 36 | static int port_cost(struct net_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | struct ethtool_cmd ecmd = { ETHTOOL_GSET }; |
| 39 | struct ifreq ifr; |
| 40 | mm_segment_t old_fs; |
| 41 | int err; |
| 42 | |
| 43 | strncpy(ifr.ifr_name, dev->name, IFNAMSIZ); |
| 44 | ifr.ifr_data = (void __user *) &ecmd; |
| 45 | |
| 46 | old_fs = get_fs(); |
| 47 | set_fs(KERNEL_DS); |
| 48 | err = dev_ethtool(&ifr); |
| 49 | set_fs(old_fs); |
| 50 | |
| 51 | if (!err) { |
| 52 | switch(ecmd.speed) { |
| 53 | case SPEED_100: |
| 54 | return 19; |
| 55 | case SPEED_1000: |
| 56 | return 4; |
| 57 | case SPEED_10000: |
| 58 | return 2; |
| 59 | case SPEED_10: |
| 60 | return 100; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | } |
| 62 | } |
| 63 | |
| 64 | /* Old silly heuristics based on name */ |
| 65 | if (!strncmp(dev->name, "lec", 3)) |
| 66 | return 7; |
| 67 | |
| 68 | if (!strncmp(dev->name, "plip", 4)) |
| 69 | return 2500; |
| 70 | |
| 71 | return 100; /* assume old 10Mbps */ |
| 72 | } |
| 73 | |
Stephen Hemminger | 4433f42 | 2005-12-20 15:19:51 -0800 | [diff] [blame] | 74 | |
| 75 | /* |
| 76 | * Check for port carrier transistions. |
| 77 | * Called from work queue to allow for calling functions that |
| 78 | * might sleep (such as speed check), and to debounce. |
| 79 | */ |
| 80 | static void port_carrier_check(void *arg) |
| 81 | { |
| 82 | struct net_bridge_port *p = arg; |
| 83 | |
| 84 | rtnl_lock(); |
| 85 | if (netif_carrier_ok(p->dev)) { |
| 86 | u32 cost = port_cost(p->dev); |
| 87 | |
| 88 | spin_lock_bh(&p->br->lock); |
| 89 | if (p->state == BR_STATE_DISABLED) { |
| 90 | p->path_cost = cost; |
| 91 | br_stp_enable_port(p); |
| 92 | } |
| 93 | spin_unlock_bh(&p->br->lock); |
| 94 | } else { |
| 95 | spin_lock_bh(&p->br->lock); |
| 96 | if (p->state != BR_STATE_DISABLED) |
| 97 | br_stp_disable_port(p); |
| 98 | spin_unlock_bh(&p->br->lock); |
| 99 | } |
| 100 | rtnl_unlock(); |
| 101 | } |
| 102 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 103 | static void destroy_nbp(struct net_bridge_port *p) |
| 104 | { |
| 105 | struct net_device *dev = p->dev; |
| 106 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 107 | p->br = NULL; |
| 108 | p->dev = NULL; |
| 109 | dev_put(dev); |
| 110 | |
| 111 | br_sysfs_freeif(p); |
| 112 | } |
| 113 | |
| 114 | static void destroy_nbp_rcu(struct rcu_head *head) |
| 115 | { |
| 116 | struct net_bridge_port *p = |
| 117 | container_of(head, struct net_bridge_port, rcu); |
| 118 | destroy_nbp(p); |
| 119 | } |
| 120 | |
| 121 | /* called with RTNL */ |
| 122 | static void del_nbp(struct net_bridge_port *p) |
| 123 | { |
| 124 | struct net_bridge *br = p->br; |
| 125 | struct net_device *dev = p->dev; |
| 126 | |
Stephen Hemminger | ab4060e | 2005-10-12 15:10:01 -0700 | [diff] [blame] | 127 | dev->br_port = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 128 | dev_set_promiscuity(dev, -1); |
| 129 | |
Stephen Hemminger | 4433f42 | 2005-12-20 15:19:51 -0800 | [diff] [blame] | 130 | cancel_delayed_work(&p->carrier_check); |
| 131 | flush_scheduled_work(); |
| 132 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 133 | spin_lock_bh(&br->lock); |
| 134 | br_stp_disable_port(p); |
| 135 | spin_unlock_bh(&br->lock); |
| 136 | |
| 137 | br_fdb_delete_by_port(br, p); |
| 138 | |
| 139 | list_del_rcu(&p->list); |
| 140 | |
| 141 | del_timer_sync(&p->message_age_timer); |
| 142 | del_timer_sync(&p->forward_delay_timer); |
| 143 | del_timer_sync(&p->hold_timer); |
| 144 | |
| 145 | call_rcu(&p->rcu, destroy_nbp_rcu); |
| 146 | } |
| 147 | |
| 148 | /* called with RTNL */ |
| 149 | static void del_br(struct net_bridge *br) |
| 150 | { |
| 151 | struct net_bridge_port *p, *n; |
| 152 | |
| 153 | list_for_each_entry_safe(p, n, &br->port_list, list) { |
| 154 | br_sysfs_removeif(p); |
| 155 | del_nbp(p); |
| 156 | } |
| 157 | |
| 158 | del_timer_sync(&br->gc_timer); |
| 159 | |
| 160 | br_sysfs_delbr(br->dev); |
| 161 | unregister_netdevice(br->dev); |
| 162 | } |
| 163 | |
| 164 | static struct net_device *new_bridge_dev(const char *name) |
| 165 | { |
| 166 | struct net_bridge *br; |
| 167 | struct net_device *dev; |
| 168 | |
| 169 | dev = alloc_netdev(sizeof(struct net_bridge), name, |
| 170 | br_dev_setup); |
| 171 | |
| 172 | if (!dev) |
| 173 | return NULL; |
| 174 | |
| 175 | br = netdev_priv(dev); |
| 176 | br->dev = dev; |
| 177 | |
| 178 | spin_lock_init(&br->lock); |
| 179 | INIT_LIST_HEAD(&br->port_list); |
| 180 | spin_lock_init(&br->hash_lock); |
| 181 | |
| 182 | br->bridge_id.prio[0] = 0x80; |
| 183 | br->bridge_id.prio[1] = 0x00; |
| 184 | memset(br->bridge_id.addr, 0, ETH_ALEN); |
| 185 | |
Stephen Hemminger | edb5e46 | 2005-12-21 19:00:58 -0800 | [diff] [blame] | 186 | br->feature_mask = dev->features; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 187 | br->stp_enabled = 0; |
| 188 | br->designated_root = br->bridge_id; |
| 189 | br->root_path_cost = 0; |
| 190 | br->root_port = 0; |
| 191 | br->bridge_max_age = br->max_age = 20 * HZ; |
| 192 | br->bridge_hello_time = br->hello_time = 2 * HZ; |
| 193 | br->bridge_forward_delay = br->forward_delay = 15 * HZ; |
| 194 | br->topology_change = 0; |
| 195 | br->topology_change_detected = 0; |
| 196 | br->ageing_time = 300 * HZ; |
| 197 | INIT_LIST_HEAD(&br->age_list); |
| 198 | |
| 199 | br_stp_timer_init(br); |
| 200 | |
| 201 | return dev; |
| 202 | } |
| 203 | |
| 204 | /* find an available port number */ |
| 205 | static int find_portno(struct net_bridge *br) |
| 206 | { |
| 207 | int index; |
| 208 | struct net_bridge_port *p; |
| 209 | unsigned long *inuse; |
| 210 | |
| 211 | inuse = kmalloc(BITS_TO_LONGS(BR_MAX_PORTS)*sizeof(unsigned long), |
| 212 | GFP_KERNEL); |
| 213 | if (!inuse) |
| 214 | return -ENOMEM; |
| 215 | |
| 216 | memset(inuse, 0, BITS_TO_LONGS(BR_MAX_PORTS)*sizeof(unsigned long)); |
| 217 | set_bit(0, inuse); /* zero is reserved */ |
| 218 | list_for_each_entry(p, &br->port_list, list) { |
| 219 | set_bit(p->port_no, inuse); |
| 220 | } |
| 221 | index = find_first_zero_bit(inuse, BR_MAX_PORTS); |
| 222 | kfree(inuse); |
| 223 | |
| 224 | return (index >= BR_MAX_PORTS) ? -EXFULL : index; |
| 225 | } |
| 226 | |
Stephen Hemminger | 4433f42 | 2005-12-20 15:19:51 -0800 | [diff] [blame] | 227 | /* called with RTNL but without bridge lock */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 228 | static struct net_bridge_port *new_nbp(struct net_bridge *br, |
Stephen Hemminger | 4433f42 | 2005-12-20 15:19:51 -0800 | [diff] [blame] | 229 | struct net_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 230 | { |
| 231 | int index; |
| 232 | struct net_bridge_port *p; |
| 233 | |
| 234 | index = find_portno(br); |
| 235 | if (index < 0) |
| 236 | return ERR_PTR(index); |
| 237 | |
| 238 | p = kmalloc(sizeof(*p), GFP_KERNEL); |
| 239 | if (p == NULL) |
| 240 | return ERR_PTR(-ENOMEM); |
| 241 | |
| 242 | memset(p, 0, sizeof(*p)); |
| 243 | p->br = br; |
| 244 | dev_hold(dev); |
| 245 | p->dev = dev; |
Stephen Hemminger | 4433f42 | 2005-12-20 15:19:51 -0800 | [diff] [blame] | 246 | p->path_cost = port_cost(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 247 | p->priority = 0x8000 >> BR_PORT_BITS; |
| 248 | dev->br_port = p; |
| 249 | p->port_no = index; |
| 250 | br_init_port(p); |
| 251 | p->state = BR_STATE_DISABLED; |
Stephen Hemminger | 4433f42 | 2005-12-20 15:19:51 -0800 | [diff] [blame] | 252 | INIT_WORK(&p->carrier_check, port_carrier_check, p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 253 | kobject_init(&p->kobj); |
| 254 | |
| 255 | return p; |
| 256 | } |
| 257 | |
| 258 | int br_add_bridge(const char *name) |
| 259 | { |
| 260 | struct net_device *dev; |
| 261 | int ret; |
| 262 | |
| 263 | dev = new_bridge_dev(name); |
| 264 | if (!dev) |
| 265 | return -ENOMEM; |
| 266 | |
| 267 | rtnl_lock(); |
| 268 | if (strchr(dev->name, '%')) { |
| 269 | ret = dev_alloc_name(dev, dev->name); |
| 270 | if (ret < 0) |
| 271 | goto err1; |
| 272 | } |
| 273 | |
| 274 | ret = register_netdevice(dev); |
| 275 | if (ret) |
| 276 | goto err2; |
| 277 | |
| 278 | /* network device kobject is not setup until |
| 279 | * after rtnl_unlock does it's hotplug magic. |
| 280 | * so hold reference to avoid race. |
| 281 | */ |
| 282 | dev_hold(dev); |
| 283 | rtnl_unlock(); |
| 284 | |
| 285 | ret = br_sysfs_addbr(dev); |
| 286 | dev_put(dev); |
| 287 | |
| 288 | if (ret) |
| 289 | unregister_netdev(dev); |
| 290 | out: |
| 291 | return ret; |
| 292 | |
| 293 | err2: |
| 294 | free_netdev(dev); |
| 295 | err1: |
| 296 | rtnl_unlock(); |
| 297 | goto out; |
| 298 | } |
| 299 | |
| 300 | int br_del_bridge(const char *name) |
| 301 | { |
| 302 | struct net_device *dev; |
| 303 | int ret = 0; |
| 304 | |
| 305 | rtnl_lock(); |
| 306 | dev = __dev_get_by_name(name); |
| 307 | if (dev == NULL) |
| 308 | ret = -ENXIO; /* Could not find device */ |
| 309 | |
| 310 | else if (!(dev->priv_flags & IFF_EBRIDGE)) { |
| 311 | /* Attempt to delete non bridge device! */ |
| 312 | ret = -EPERM; |
| 313 | } |
| 314 | |
| 315 | else if (dev->flags & IFF_UP) { |
| 316 | /* Not shutdown yet. */ |
| 317 | ret = -EBUSY; |
| 318 | } |
| 319 | |
| 320 | else |
| 321 | del_br(netdev_priv(dev)); |
| 322 | |
| 323 | rtnl_unlock(); |
| 324 | return ret; |
| 325 | } |
| 326 | |
Kris Katterjohn | 46f25df | 2006-01-05 16:35:42 -0800 | [diff] [blame] | 327 | /* MTU of the bridge pseudo-device: ETH_DATA_LEN or the minimum of the ports */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 328 | int br_min_mtu(const struct net_bridge *br) |
| 329 | { |
| 330 | const struct net_bridge_port *p; |
| 331 | int mtu = 0; |
| 332 | |
| 333 | ASSERT_RTNL(); |
| 334 | |
| 335 | if (list_empty(&br->port_list)) |
Kris Katterjohn | 46f25df | 2006-01-05 16:35:42 -0800 | [diff] [blame] | 336 | mtu = ETH_DATA_LEN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 337 | else { |
| 338 | list_for_each_entry(p, &br->port_list, list) { |
| 339 | if (!mtu || p->dev->mtu < mtu) |
| 340 | mtu = p->dev->mtu; |
| 341 | } |
| 342 | } |
| 343 | return mtu; |
| 344 | } |
| 345 | |
Stephen Hemminger | 81d3530 | 2005-05-29 14:15:17 -0700 | [diff] [blame] | 346 | /* |
| 347 | * Recomputes features using slave's features |
| 348 | */ |
| 349 | void br_features_recompute(struct net_bridge *br) |
| 350 | { |
| 351 | struct net_bridge_port *p; |
| 352 | unsigned long features, checksum; |
| 353 | |
Stephen Hemminger | edb5e46 | 2005-12-21 19:00:58 -0800 | [diff] [blame] | 354 | features = br->feature_mask &~ NETIF_F_IP_CSUM; |
| 355 | checksum = br->feature_mask & NETIF_F_IP_CSUM; |
Stephen Hemminger | 81d3530 | 2005-05-29 14:15:17 -0700 | [diff] [blame] | 356 | |
| 357 | list_for_each_entry(p, &br->port_list, list) { |
| 358 | if (!(p->dev->features |
| 359 | & (NETIF_F_IP_CSUM|NETIF_F_NO_CSUM|NETIF_F_HW_CSUM))) |
| 360 | checksum = 0; |
| 361 | features &= p->dev->features; |
| 362 | } |
| 363 | |
| 364 | br->dev->features = features | checksum | NETIF_F_LLTX; |
| 365 | } |
| 366 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 367 | /* called with RTNL */ |
| 368 | int br_add_if(struct net_bridge *br, struct net_device *dev) |
| 369 | { |
| 370 | struct net_bridge_port *p; |
| 371 | int err = 0; |
| 372 | |
| 373 | if (dev->flags & IFF_LOOPBACK || dev->type != ARPHRD_ETHER) |
| 374 | return -EINVAL; |
| 375 | |
| 376 | if (dev->hard_start_xmit == br_dev_xmit) |
| 377 | return -ELOOP; |
| 378 | |
| 379 | if (dev->br_port != NULL) |
| 380 | return -EBUSY; |
| 381 | |
Stephen Hemminger | 4433f42 | 2005-12-20 15:19:51 -0800 | [diff] [blame] | 382 | if (IS_ERR(p = new_nbp(br, dev))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 383 | return PTR_ERR(p); |
| 384 | |
| 385 | if ((err = br_fdb_insert(br, p, dev->dev_addr))) |
| 386 | destroy_nbp(p); |
| 387 | |
| 388 | else if ((err = br_sysfs_addif(p))) |
| 389 | del_nbp(p); |
| 390 | else { |
| 391 | dev_set_promiscuity(dev, 1); |
| 392 | |
| 393 | list_add_rcu(&p->list, &br->port_list); |
| 394 | |
| 395 | spin_lock_bh(&br->lock); |
| 396 | br_stp_recalculate_bridge_id(br); |
Olaf Rempel | 133747e | 2005-11-23 19:04:08 -0800 | [diff] [blame] | 397 | br_features_recompute(br); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 398 | if ((br->dev->flags & IFF_UP) |
| 399 | && (dev->flags & IFF_UP) && netif_carrier_ok(dev)) |
| 400 | br_stp_enable_port(p); |
| 401 | spin_unlock_bh(&br->lock); |
| 402 | |
| 403 | dev_set_mtu(br->dev, br_min_mtu(br)); |
| 404 | } |
| 405 | |
| 406 | return err; |
| 407 | } |
| 408 | |
| 409 | /* called with RTNL */ |
| 410 | int br_del_if(struct net_bridge *br, struct net_device *dev) |
| 411 | { |
| 412 | struct net_bridge_port *p = dev->br_port; |
| 413 | |
| 414 | if (!p || p->br != br) |
| 415 | return -EINVAL; |
| 416 | |
| 417 | br_sysfs_removeif(p); |
| 418 | del_nbp(p); |
| 419 | |
| 420 | spin_lock_bh(&br->lock); |
| 421 | br_stp_recalculate_bridge_id(br); |
Stephen Hemminger | 81d3530 | 2005-05-29 14:15:17 -0700 | [diff] [blame] | 422 | br_features_recompute(br); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 423 | spin_unlock_bh(&br->lock); |
| 424 | |
| 425 | return 0; |
| 426 | } |
| 427 | |
| 428 | void __exit br_cleanup_bridges(void) |
| 429 | { |
| 430 | struct net_device *dev, *nxt; |
| 431 | |
| 432 | rtnl_lock(); |
| 433 | for (dev = dev_base; dev; dev = nxt) { |
| 434 | nxt = dev->next; |
| 435 | if (dev->priv_flags & IFF_EBRIDGE) |
| 436 | del_br(dev->priv); |
| 437 | } |
| 438 | rtnl_unlock(); |
| 439 | |
| 440 | } |