rjw | 1f88458 | 2022-01-06 17:20:42 +0800 | [diff] [blame^] | 1 | /* |
| 2 | * Userspace interface |
| 3 | * Linux ethernet bridge |
| 4 | * |
| 5 | * Authors: |
| 6 | * Lennert Buytenhek <buytenh@gnu.org> |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or |
| 9 | * modify it under the terms of the GNU General Public License |
| 10 | * as published by the Free Software Foundation; either version |
| 11 | * 2 of the License, or (at your option) any later version. |
| 12 | */ |
| 13 | |
| 14 | #include <linux/kernel.h> |
| 15 | #include <linux/netdevice.h> |
| 16 | #include <linux/etherdevice.h> |
| 17 | #include <linux/netpoll.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> |
| 23 | #include <linux/if_ether.h> |
| 24 | #include <linux/slab.h> |
| 25 | #include <net/dsa.h> |
| 26 | #include <net/sock.h> |
| 27 | #include <linux/if_vlan.h> |
| 28 | #include <net/switchdev.h> |
| 29 | |
| 30 | #include "br_private.h" |
| 31 | |
| 32 | /* |
| 33 | * Determine initial path cost based on speed. |
| 34 | * using recommendations from 802.1d standard |
| 35 | * |
| 36 | * Since driver might sleep need to not be holding any locks. |
| 37 | */ |
| 38 | static int port_cost(struct net_device *dev) |
| 39 | { |
| 40 | struct ethtool_link_ksettings ecmd; |
| 41 | |
| 42 | if (!__ethtool_get_link_ksettings(dev, &ecmd)) { |
| 43 | switch (ecmd.base.speed) { |
| 44 | case SPEED_10000: |
| 45 | return 2; |
| 46 | case SPEED_1000: |
| 47 | return 4; |
| 48 | case SPEED_100: |
| 49 | return 19; |
| 50 | case SPEED_10: |
| 51 | return 100; |
| 52 | } |
| 53 | } |
| 54 | |
| 55 | /* Old silly heuristics based on name */ |
| 56 | if (!strncmp(dev->name, "lec", 3)) |
| 57 | return 7; |
| 58 | |
| 59 | if (!strncmp(dev->name, "plip", 4)) |
| 60 | return 2500; |
| 61 | |
| 62 | return 100; /* assume old 10Mbps */ |
| 63 | } |
| 64 | |
| 65 | |
| 66 | /* Check for port carrier transitions. */ |
| 67 | void br_port_carrier_check(struct net_bridge_port *p) |
| 68 | { |
| 69 | struct net_device *dev = p->dev; |
| 70 | struct net_bridge *br = p->br; |
| 71 | |
| 72 | if (!(p->flags & BR_ADMIN_COST) && |
| 73 | netif_running(dev) && netif_oper_up(dev)) |
| 74 | p->path_cost = port_cost(dev); |
| 75 | |
| 76 | if (!netif_running(br->dev)) |
| 77 | return; |
| 78 | |
| 79 | spin_lock_bh(&br->lock); |
| 80 | if (netif_running(dev) && netif_oper_up(dev)) { |
| 81 | if (p->state == BR_STATE_DISABLED) |
| 82 | br_stp_enable_port(p); |
| 83 | } else { |
| 84 | if (p->state != BR_STATE_DISABLED) |
| 85 | br_stp_disable_port(p); |
| 86 | } |
| 87 | spin_unlock_bh(&br->lock); |
| 88 | } |
| 89 | |
| 90 | static void br_port_set_promisc(struct net_bridge_port *p) |
| 91 | { |
| 92 | int err = 0; |
| 93 | |
| 94 | if (br_promisc_port(p)) |
| 95 | return; |
| 96 | |
| 97 | err = dev_set_promiscuity(p->dev, 1); |
| 98 | if (err) |
| 99 | return; |
| 100 | |
| 101 | br_fdb_unsync_static(p->br, p); |
| 102 | p->flags |= BR_PROMISC; |
| 103 | } |
| 104 | |
| 105 | static void br_port_clear_promisc(struct net_bridge_port *p) |
| 106 | { |
| 107 | int err; |
| 108 | |
| 109 | /* Check if the port is already non-promisc or if it doesn't |
| 110 | * support UNICAST filtering. Without unicast filtering support |
| 111 | * we'll end up re-enabling promisc mode anyway, so just check for |
| 112 | * it here. |
| 113 | */ |
| 114 | if (!br_promisc_port(p) || !(p->dev->priv_flags & IFF_UNICAST_FLT)) |
| 115 | return; |
| 116 | |
| 117 | /* Since we'll be clearing the promisc mode, program the port |
| 118 | * first so that we don't have interruption in traffic. |
| 119 | */ |
| 120 | err = br_fdb_sync_static(p->br, p); |
| 121 | if (err) |
| 122 | return; |
| 123 | |
| 124 | dev_set_promiscuity(p->dev, -1); |
| 125 | p->flags &= ~BR_PROMISC; |
| 126 | } |
| 127 | |
| 128 | /* When a port is added or removed or when certain port flags |
| 129 | * change, this function is called to automatically manage |
| 130 | * promiscuity setting of all the bridge ports. We are always called |
| 131 | * under RTNL so can skip using rcu primitives. |
| 132 | */ |
| 133 | void br_manage_promisc(struct net_bridge *br) |
| 134 | { |
| 135 | struct net_bridge_port *p; |
| 136 | bool set_all = false; |
| 137 | |
| 138 | /* If vlan filtering is disabled or bridge interface is placed |
| 139 | * into promiscuous mode, place all ports in promiscuous mode. |
| 140 | */ |
| 141 | if ((br->dev->flags & IFF_PROMISC) || !br_vlan_enabled(br->dev)) |
| 142 | set_all = true; |
| 143 | |
| 144 | list_for_each_entry(p, &br->port_list, list) { |
| 145 | if (set_all) { |
| 146 | br_port_set_promisc(p); |
| 147 | } else { |
| 148 | /* If the number of auto-ports is <= 1, then all other |
| 149 | * ports will have their output configuration |
| 150 | * statically specified through fdbs. Since ingress |
| 151 | * on the auto-port becomes forwarding/egress to other |
| 152 | * ports and egress configuration is statically known, |
| 153 | * we can say that ingress configuration of the |
| 154 | * auto-port is also statically known. |
| 155 | * This lets us disable promiscuous mode and write |
| 156 | * this config to hw. |
| 157 | */ |
| 158 | if (br->auto_cnt == 0 || |
| 159 | (br->auto_cnt == 1 && br_auto_port(p))) |
| 160 | br_port_clear_promisc(p); |
| 161 | else |
| 162 | br_port_set_promisc(p); |
| 163 | } |
| 164 | } |
| 165 | } |
| 166 | |
| 167 | static void nbp_update_port_count(struct net_bridge *br) |
| 168 | { |
| 169 | struct net_bridge_port *p; |
| 170 | u32 cnt = 0; |
| 171 | |
| 172 | list_for_each_entry(p, &br->port_list, list) { |
| 173 | if (br_auto_port(p)) |
| 174 | cnt++; |
| 175 | } |
| 176 | if (br->auto_cnt != cnt) { |
| 177 | br->auto_cnt = cnt; |
| 178 | br_manage_promisc(br); |
| 179 | } |
| 180 | } |
| 181 | |
| 182 | static void nbp_delete_promisc(struct net_bridge_port *p) |
| 183 | { |
| 184 | /* If port is currently promiscuous, unset promiscuity. |
| 185 | * Otherwise, it is a static port so remove all addresses |
| 186 | * from it. |
| 187 | */ |
| 188 | dev_set_allmulti(p->dev, -1); |
| 189 | if (br_promisc_port(p)) |
| 190 | dev_set_promiscuity(p->dev, -1); |
| 191 | else |
| 192 | br_fdb_unsync_static(p->br, p); |
| 193 | } |
| 194 | |
| 195 | static void release_nbp(struct kobject *kobj) |
| 196 | { |
| 197 | struct net_bridge_port *p |
| 198 | = container_of(kobj, struct net_bridge_port, kobj); |
| 199 | kfree(p); |
| 200 | } |
| 201 | |
| 202 | static struct kobj_type brport_ktype = { |
| 203 | #ifdef CONFIG_SYSFS |
| 204 | .sysfs_ops = &brport_sysfs_ops, |
| 205 | #endif |
| 206 | .release = release_nbp, |
| 207 | }; |
| 208 | |
| 209 | static void destroy_nbp(struct net_bridge_port *p) |
| 210 | { |
| 211 | struct net_device *dev = p->dev; |
| 212 | |
| 213 | p->br = NULL; |
| 214 | p->dev = NULL; |
| 215 | dev_put(dev); |
| 216 | |
| 217 | kobject_put(&p->kobj); |
| 218 | } |
| 219 | |
| 220 | static void destroy_nbp_rcu(struct rcu_head *head) |
| 221 | { |
| 222 | struct net_bridge_port *p = |
| 223 | container_of(head, struct net_bridge_port, rcu); |
| 224 | destroy_nbp(p); |
| 225 | } |
| 226 | |
| 227 | static unsigned get_max_headroom(struct net_bridge *br) |
| 228 | { |
| 229 | unsigned max_headroom = 0; |
| 230 | struct net_bridge_port *p; |
| 231 | |
| 232 | list_for_each_entry(p, &br->port_list, list) { |
| 233 | unsigned dev_headroom = netdev_get_fwd_headroom(p->dev); |
| 234 | |
| 235 | if (dev_headroom > max_headroom) |
| 236 | max_headroom = dev_headroom; |
| 237 | } |
| 238 | |
| 239 | return max_headroom; |
| 240 | } |
| 241 | |
| 242 | static void update_headroom(struct net_bridge *br, int new_hr) |
| 243 | { |
| 244 | struct net_bridge_port *p; |
| 245 | |
| 246 | list_for_each_entry(p, &br->port_list, list) |
| 247 | netdev_set_rx_headroom(p->dev, new_hr); |
| 248 | |
| 249 | br->dev->needed_headroom = new_hr; |
| 250 | } |
| 251 | |
| 252 | /* Delete port(interface) from bridge is done in two steps. |
| 253 | * via RCU. First step, marks device as down. That deletes |
| 254 | * all the timers and stops new packets from flowing through. |
| 255 | * |
| 256 | * Final cleanup doesn't occur until after all CPU's finished |
| 257 | * processing packets. |
| 258 | * |
| 259 | * Protected from multiple admin operations by RTNL mutex |
| 260 | */ |
| 261 | static void del_nbp(struct net_bridge_port *p) |
| 262 | { |
| 263 | struct net_bridge *br = p->br; |
| 264 | struct net_device *dev = p->dev; |
| 265 | |
| 266 | sysfs_remove_link(br->ifobj, p->dev->name); |
| 267 | |
| 268 | nbp_delete_promisc(p); |
| 269 | |
| 270 | spin_lock_bh(&br->lock); |
| 271 | br_stp_disable_port(p); |
| 272 | spin_unlock_bh(&br->lock); |
| 273 | |
| 274 | br_ifinfo_notify(RTM_DELLINK, p); |
| 275 | |
| 276 | list_del_rcu(&p->list); |
| 277 | if (netdev_get_fwd_headroom(dev) == br->dev->needed_headroom) |
| 278 | update_headroom(br, get_max_headroom(br)); |
| 279 | netdev_reset_rx_headroom(dev); |
| 280 | |
| 281 | nbp_vlan_flush(p); |
| 282 | br_fdb_delete_by_port(br, p, 0, 1); |
| 283 | switchdev_deferred_process(); |
| 284 | |
| 285 | nbp_update_port_count(br); |
| 286 | |
| 287 | netdev_upper_dev_unlink(dev, br->dev); |
| 288 | |
| 289 | dev->priv_flags &= ~IFF_BRIDGE_PORT; |
| 290 | |
| 291 | netdev_rx_handler_unregister(dev); |
| 292 | |
| 293 | br_multicast_del_port(p); |
| 294 | |
| 295 | kobject_uevent(&p->kobj, KOBJ_REMOVE); |
| 296 | kobject_del(&p->kobj); |
| 297 | |
| 298 | br_netpoll_disable(p); |
| 299 | |
| 300 | call_rcu(&p->rcu, destroy_nbp_rcu); |
| 301 | } |
| 302 | |
| 303 | /* Delete bridge device */ |
| 304 | void br_dev_delete(struct net_device *dev, struct list_head *head) |
| 305 | { |
| 306 | struct net_bridge *br = netdev_priv(dev); |
| 307 | struct net_bridge_port *p, *n; |
| 308 | |
| 309 | list_for_each_entry_safe(p, n, &br->port_list, list) { |
| 310 | del_nbp(p); |
| 311 | } |
| 312 | |
| 313 | br_fdb_delete_by_port(br, NULL, 0, 1); |
| 314 | |
| 315 | cancel_delayed_work_sync(&br->gc_work); |
| 316 | |
| 317 | br_sysfs_delbr(br->dev); |
| 318 | unregister_netdevice_queue(br->dev, head); |
| 319 | } |
| 320 | |
| 321 | /* find an available port number */ |
| 322 | static int find_portno(struct net_bridge *br) |
| 323 | { |
| 324 | int index; |
| 325 | struct net_bridge_port *p; |
| 326 | unsigned long *inuse; |
| 327 | |
| 328 | inuse = kcalloc(BITS_TO_LONGS(BR_MAX_PORTS), sizeof(unsigned long), |
| 329 | GFP_KERNEL); |
| 330 | if (!inuse) |
| 331 | return -ENOMEM; |
| 332 | |
| 333 | set_bit(0, inuse); /* zero is reserved */ |
| 334 | list_for_each_entry(p, &br->port_list, list) { |
| 335 | set_bit(p->port_no, inuse); |
| 336 | } |
| 337 | index = find_first_zero_bit(inuse, BR_MAX_PORTS); |
| 338 | kfree(inuse); |
| 339 | |
| 340 | return (index >= BR_MAX_PORTS) ? -EXFULL : index; |
| 341 | } |
| 342 | |
| 343 | /* called with RTNL but without bridge lock */ |
| 344 | static struct net_bridge_port *new_nbp(struct net_bridge *br, |
| 345 | struct net_device *dev) |
| 346 | { |
| 347 | struct net_bridge_port *p; |
| 348 | int index, err; |
| 349 | |
| 350 | index = find_portno(br); |
| 351 | if (index < 0) |
| 352 | return ERR_PTR(index); |
| 353 | |
| 354 | p = kzalloc(sizeof(*p), GFP_KERNEL); |
| 355 | if (p == NULL) |
| 356 | return ERR_PTR(-ENOMEM); |
| 357 | |
| 358 | p->br = br; |
| 359 | dev_hold(dev); |
| 360 | p->dev = dev; |
| 361 | p->path_cost = port_cost(dev); |
| 362 | p->priority = 0x8000 >> BR_PORT_BITS; |
| 363 | p->port_no = index; |
| 364 | p->flags = BR_LEARNING | BR_FLOOD | BR_MCAST_FLOOD | BR_BCAST_FLOOD; |
| 365 | br_init_port(p); |
| 366 | br_set_state(p, BR_STATE_DISABLED); |
| 367 | br_stp_port_timer_init(p); |
| 368 | err = br_multicast_add_port(p); |
| 369 | if (err) { |
| 370 | dev_put(dev); |
| 371 | kfree(p); |
| 372 | p = ERR_PTR(err); |
| 373 | } |
| 374 | |
| 375 | return p; |
| 376 | } |
| 377 | |
| 378 | int br_add_bridge(struct net *net, const char *name) |
| 379 | { |
| 380 | struct net_device *dev; |
| 381 | int res; |
| 382 | |
| 383 | dev = alloc_netdev(sizeof(struct net_bridge), name, NET_NAME_UNKNOWN, |
| 384 | br_dev_setup); |
| 385 | |
| 386 | if (!dev) |
| 387 | return -ENOMEM; |
| 388 | |
| 389 | dev_net_set(dev, net); |
| 390 | dev->rtnl_link_ops = &br_link_ops; |
| 391 | |
| 392 | res = register_netdev(dev); |
| 393 | if (res) |
| 394 | free_netdev(dev); |
| 395 | return res; |
| 396 | } |
| 397 | |
| 398 | int br_del_bridge(struct net *net, const char *name) |
| 399 | { |
| 400 | struct net_device *dev; |
| 401 | int ret = 0; |
| 402 | |
| 403 | rtnl_lock(); |
| 404 | dev = __dev_get_by_name(net, name); |
| 405 | if (dev == NULL) |
| 406 | ret = -ENXIO; /* Could not find device */ |
| 407 | |
| 408 | else if (!(dev->priv_flags & IFF_EBRIDGE)) { |
| 409 | /* Attempt to delete non bridge device! */ |
| 410 | ret = -EPERM; |
| 411 | } |
| 412 | |
| 413 | else if (dev->flags & IFF_UP) { |
| 414 | /* Not shutdown yet. */ |
| 415 | ret = -EBUSY; |
| 416 | } |
| 417 | |
| 418 | else |
| 419 | br_dev_delete(dev, NULL); |
| 420 | |
| 421 | rtnl_unlock(); |
| 422 | return ret; |
| 423 | } |
| 424 | |
| 425 | /* MTU of the bridge pseudo-device: ETH_DATA_LEN or the minimum of the ports */ |
| 426 | int br_min_mtu(const struct net_bridge *br) |
| 427 | { |
| 428 | const struct net_bridge_port *p; |
| 429 | int mtu = 0; |
| 430 | |
| 431 | ASSERT_RTNL(); |
| 432 | |
| 433 | if (list_empty(&br->port_list)) |
| 434 | mtu = ETH_DATA_LEN; |
| 435 | else { |
| 436 | list_for_each_entry(p, &br->port_list, list) { |
| 437 | if (!mtu || p->dev->mtu < mtu) |
| 438 | mtu = p->dev->mtu; |
| 439 | } |
| 440 | } |
| 441 | return mtu; |
| 442 | } |
| 443 | |
| 444 | static void br_set_gso_limits(struct net_bridge *br) |
| 445 | { |
| 446 | unsigned int gso_max_size = GSO_MAX_SIZE; |
| 447 | u16 gso_max_segs = GSO_MAX_SEGS; |
| 448 | const struct net_bridge_port *p; |
| 449 | |
| 450 | list_for_each_entry(p, &br->port_list, list) { |
| 451 | gso_max_size = min(gso_max_size, p->dev->gso_max_size); |
| 452 | gso_max_segs = min(gso_max_segs, p->dev->gso_max_segs); |
| 453 | } |
| 454 | br->dev->gso_max_size = gso_max_size; |
| 455 | br->dev->gso_max_segs = gso_max_segs; |
| 456 | } |
| 457 | |
| 458 | /* |
| 459 | * Recomputes features using slave's features |
| 460 | */ |
| 461 | netdev_features_t br_features_recompute(struct net_bridge *br, |
| 462 | netdev_features_t features) |
| 463 | { |
| 464 | struct net_bridge_port *p; |
| 465 | netdev_features_t mask; |
| 466 | |
| 467 | if (list_empty(&br->port_list)) |
| 468 | return features; |
| 469 | |
| 470 | mask = features; |
| 471 | features &= ~NETIF_F_ONE_FOR_ALL; |
| 472 | |
| 473 | list_for_each_entry(p, &br->port_list, list) { |
| 474 | features = netdev_increment_features(features, |
| 475 | p->dev->features, mask); |
| 476 | } |
| 477 | features = netdev_add_tso_features(features, mask); |
| 478 | |
| 479 | return features; |
| 480 | } |
| 481 | |
| 482 | /* called with RTNL */ |
| 483 | int br_add_if(struct net_bridge *br, struct net_device *dev) |
| 484 | { |
| 485 | struct net_bridge_port *p; |
| 486 | int err = 0; |
| 487 | unsigned br_hr, dev_hr; |
| 488 | bool changed_addr; |
| 489 | |
| 490 | /* Don't allow bridging non-ethernet like devices, or DSA-enabled |
| 491 | * master network devices since the bridge layer rx_handler prevents |
| 492 | * the DSA fake ethertype handler to be invoked, so we do not strip off |
| 493 | * the DSA switch tag protocol header and the bridge layer just return |
| 494 | * RX_HANDLER_CONSUMED, stopping RX processing for these frames. |
| 495 | */ |
| 496 | if ((dev->flags & IFF_LOOPBACK) || |
| 497 | dev->type != ARPHRD_ETHER || dev->addr_len != ETH_ALEN || |
| 498 | !is_valid_ether_addr(dev->dev_addr) || |
| 499 | netdev_uses_dsa(dev)) |
| 500 | return -EINVAL; |
| 501 | |
| 502 | /* No bridging of bridges */ |
| 503 | if (dev->netdev_ops->ndo_start_xmit == br_dev_xmit) |
| 504 | return -ELOOP; |
| 505 | |
| 506 | /* Device has master upper dev */ |
| 507 | if (netdev_master_upper_dev_get(dev)) |
| 508 | return -EBUSY; |
| 509 | |
| 510 | /* No bridging devices that dislike that (e.g. wireless) */ |
| 511 | if (dev->priv_flags & IFF_DONT_BRIDGE) |
| 512 | return -EOPNOTSUPP; |
| 513 | |
| 514 | p = new_nbp(br, dev); |
| 515 | if (IS_ERR(p)) |
| 516 | return PTR_ERR(p); |
| 517 | |
| 518 | call_netdevice_notifiers(NETDEV_JOIN, dev); |
| 519 | |
| 520 | err = dev_set_allmulti(dev, 1); |
| 521 | if (err) { |
| 522 | kfree(p); /* kobject not yet init'd, manually free */ |
| 523 | goto err1; |
| 524 | } |
| 525 | |
| 526 | err = kobject_init_and_add(&p->kobj, &brport_ktype, &(dev->dev.kobj), |
| 527 | SYSFS_BRIDGE_PORT_ATTR); |
| 528 | if (err) |
| 529 | goto err2; |
| 530 | |
| 531 | err = br_sysfs_addif(p); |
| 532 | if (err) |
| 533 | goto err2; |
| 534 | |
| 535 | err = br_netpoll_enable(p); |
| 536 | if (err) |
| 537 | goto err3; |
| 538 | |
| 539 | err = netdev_rx_handler_register(dev, br_handle_frame, p); |
| 540 | if (err) |
| 541 | goto err4; |
| 542 | |
| 543 | dev->priv_flags |= IFF_BRIDGE_PORT; |
| 544 | |
| 545 | err = netdev_master_upper_dev_link(dev, br->dev, NULL, NULL); |
| 546 | if (err) |
| 547 | goto err5; |
| 548 | |
| 549 | err = nbp_switchdev_mark_set(p); |
| 550 | if (err) |
| 551 | goto err6; |
| 552 | |
| 553 | dev_disable_lro(dev); |
| 554 | |
| 555 | list_add_rcu(&p->list, &br->port_list); |
| 556 | |
| 557 | nbp_update_port_count(br); |
| 558 | |
| 559 | netdev_update_features(br->dev); |
| 560 | |
| 561 | br_hr = br->dev->needed_headroom; |
| 562 | dev_hr = netdev_get_fwd_headroom(dev); |
| 563 | if (br_hr < dev_hr) |
| 564 | update_headroom(br, dev_hr); |
| 565 | else |
| 566 | netdev_set_rx_headroom(dev, br_hr); |
| 567 | |
| 568 | if (br_fdb_insert(br, p, dev->dev_addr, 0)) |
| 569 | netdev_err(dev, "failed insert local address bridge forwarding table\n"); |
| 570 | |
| 571 | err = nbp_vlan_init(p); |
| 572 | if (err) { |
| 573 | netdev_err(dev, "failed to initialize vlan filtering on this port\n"); |
| 574 | goto err7; |
| 575 | } |
| 576 | |
| 577 | spin_lock_bh(&br->lock); |
| 578 | changed_addr = br_stp_recalculate_bridge_id(br); |
| 579 | |
| 580 | if (netif_running(dev) && netif_oper_up(dev) && |
| 581 | (br->dev->flags & IFF_UP)) |
| 582 | br_stp_enable_port(p); |
| 583 | spin_unlock_bh(&br->lock); |
| 584 | |
| 585 | br_ifinfo_notify(RTM_NEWLINK, p); |
| 586 | |
| 587 | if (changed_addr) |
| 588 | call_netdevice_notifiers(NETDEV_CHANGEADDR, br->dev); |
| 589 | |
| 590 | dev_set_mtu(br->dev, br_min_mtu(br)); |
| 591 | br_set_gso_limits(br); |
| 592 | |
| 593 | kobject_uevent(&p->kobj, KOBJ_ADD); |
| 594 | |
| 595 | return 0; |
| 596 | |
| 597 | err7: |
| 598 | list_del_rcu(&p->list); |
| 599 | br_fdb_delete_by_port(br, p, 0, 1); |
| 600 | nbp_update_port_count(br); |
| 601 | err6: |
| 602 | netdev_upper_dev_unlink(dev, br->dev); |
| 603 | err5: |
| 604 | dev->priv_flags &= ~IFF_BRIDGE_PORT; |
| 605 | netdev_rx_handler_unregister(dev); |
| 606 | err4: |
| 607 | br_netpoll_disable(p); |
| 608 | err3: |
| 609 | sysfs_remove_link(br->ifobj, p->dev->name); |
| 610 | err2: |
| 611 | kobject_put(&p->kobj); |
| 612 | dev_set_allmulti(dev, -1); |
| 613 | err1: |
| 614 | dev_put(dev); |
| 615 | return err; |
| 616 | } |
| 617 | |
| 618 | /* called with RTNL */ |
| 619 | int br_del_if(struct net_bridge *br, struct net_device *dev) |
| 620 | { |
| 621 | struct net_bridge_port *p; |
| 622 | bool changed_addr; |
| 623 | |
| 624 | p = br_port_get_rtnl(dev); |
| 625 | if (!p || p->br != br) |
| 626 | return -EINVAL; |
| 627 | |
| 628 | /* Since more than one interface can be attached to a bridge, |
| 629 | * there still maybe an alternate path for netconsole to use; |
| 630 | * therefore there is no reason for a NETDEV_RELEASE event. |
| 631 | */ |
| 632 | del_nbp(p); |
| 633 | |
| 634 | dev_set_mtu(br->dev, br_min_mtu(br)); |
| 635 | br_set_gso_limits(br); |
| 636 | |
| 637 | spin_lock_bh(&br->lock); |
| 638 | changed_addr = br_stp_recalculate_bridge_id(br); |
| 639 | spin_unlock_bh(&br->lock); |
| 640 | |
| 641 | if (changed_addr) |
| 642 | call_netdevice_notifiers(NETDEV_CHANGEADDR, br->dev); |
| 643 | |
| 644 | netdev_update_features(br->dev); |
| 645 | |
| 646 | return 0; |
| 647 | } |
| 648 | |
| 649 | void br_port_flags_change(struct net_bridge_port *p, unsigned long mask) |
| 650 | { |
| 651 | struct net_bridge *br = p->br; |
| 652 | |
| 653 | if (mask & BR_AUTO_MASK) |
| 654 | nbp_update_port_count(br); |
| 655 | } |