| 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
| 2 | /* |
| 3 | * Userspace interface |
| 4 | * Linux ethernet bridge |
| 5 | * |
| 6 | * Authors: |
| 7 | * Lennert Buytenhek <buytenh@gnu.org> |
| 8 | */ |
| 9 | |
| 10 | #include <linux/kernel.h> |
| 11 | #include <linux/netdevice.h> |
| 12 | #include <linux/etherdevice.h> |
| 13 | #include <linux/netpoll.h> |
| 14 | #include <linux/ethtool.h> |
| 15 | #include <linux/if_arp.h> |
| 16 | #include <linux/module.h> |
| 17 | #include <linux/init.h> |
| 18 | #include <linux/rtnetlink.h> |
| 19 | #include <linux/if_ether.h> |
| 20 | #include <linux/slab.h> |
| 21 | #include <net/dsa.h> |
| 22 | #include <net/sock.h> |
| 23 | #include <linux/if_vlan.h> |
| 24 | #include <net/switchdev.h> |
| 25 | #include <net/net_namespace.h> |
| 26 | |
| 27 | #include "br_private.h" |
| 28 | |
| 29 | /* |
| 30 | * Determine initial path cost based on speed. |
| 31 | * using recommendations from 802.1d standard |
| 32 | * |
| 33 | * Since driver might sleep need to not be holding any locks. |
| 34 | */ |
| 35 | static int port_cost(struct net_device *dev) |
| 36 | { |
| 37 | struct ethtool_link_ksettings ecmd; |
| 38 | |
| 39 | if (!__ethtool_get_link_ksettings(dev, &ecmd)) { |
| 40 | switch (ecmd.base.speed) { |
| 41 | case SPEED_10000: |
| 42 | return 2; |
| 43 | case SPEED_5000: |
| 44 | return 3; |
| 45 | case SPEED_2500: |
| 46 | return 4; |
| 47 | case SPEED_1000: |
| 48 | return 5; |
| 49 | case SPEED_100: |
| 50 | return 19; |
| 51 | case SPEED_10: |
| 52 | return 100; |
| 53 | case SPEED_UNKNOWN: |
| 54 | return 100; |
| 55 | default: |
| 56 | if (ecmd.base.speed > SPEED_10000) |
| 57 | return 1; |
| 58 | } |
| 59 | } |
| 60 | |
| 61 | /* Old silly heuristics based on name */ |
| 62 | if (!strncmp(dev->name, "lec", 3)) |
| 63 | return 7; |
| 64 | |
| 65 | if (!strncmp(dev->name, "plip", 4)) |
| 66 | return 2500; |
| 67 | |
| 68 | return 100; /* assume old 10Mbps */ |
| 69 | } |
| 70 | |
| 71 | |
| 72 | /* Check for port carrier transitions. */ |
| 73 | void br_port_carrier_check(struct net_bridge_port *p, bool *notified) |
| 74 | { |
| 75 | struct net_device *dev = p->dev; |
| 76 | struct net_bridge *br = p->br; |
| 77 | |
| 78 | if (!(p->flags & BR_ADMIN_COST) && |
| 79 | netif_running(dev) && netif_oper_up(dev)) |
| 80 | p->path_cost = port_cost(dev); |
| 81 | |
| 82 | *notified = false; |
| 83 | if (!netif_running(br->dev)) |
| 84 | return; |
| 85 | |
| 86 | spin_lock_bh(&br->lock); |
| 87 | if (netif_running(dev) && netif_oper_up(dev)) { |
| 88 | if (p->state == BR_STATE_DISABLED) { |
| 89 | br_stp_enable_port(p); |
| 90 | *notified = true; |
| 91 | } |
| 92 | } else { |
| 93 | if (p->state != BR_STATE_DISABLED) { |
| 94 | br_stp_disable_port(p); |
| 95 | *notified = true; |
| 96 | } |
| 97 | } |
| 98 | spin_unlock_bh(&br->lock); |
| 99 | } |
| 100 | |
| 101 | static void br_port_set_promisc(struct net_bridge_port *p) |
| 102 | { |
| 103 | int err = 0; |
| 104 | |
| 105 | if (br_promisc_port(p)) |
| 106 | return; |
| 107 | |
| 108 | err = dev_set_promiscuity(p->dev, 1); |
| 109 | if (err) |
| 110 | return; |
| 111 | |
| 112 | br_fdb_unsync_static(p->br, p); |
| 113 | p->flags |= BR_PROMISC; |
| 114 | } |
| 115 | |
| 116 | static void br_port_clear_promisc(struct net_bridge_port *p) |
| 117 | { |
| 118 | int err; |
| 119 | |
| 120 | /* Check if the port is already non-promisc or if it doesn't |
| 121 | * support UNICAST filtering. Without unicast filtering support |
| 122 | * we'll end up re-enabling promisc mode anyway, so just check for |
| 123 | * it here. |
| 124 | */ |
| 125 | if (!br_promisc_port(p) || !(p->dev->priv_flags & IFF_UNICAST_FLT)) |
| 126 | return; |
| 127 | |
| 128 | /* Since we'll be clearing the promisc mode, program the port |
| 129 | * first so that we don't have interruption in traffic. |
| 130 | */ |
| 131 | err = br_fdb_sync_static(p->br, p); |
| 132 | if (err) |
| 133 | return; |
| 134 | |
| 135 | dev_set_promiscuity(p->dev, -1); |
| 136 | p->flags &= ~BR_PROMISC; |
| 137 | } |
| 138 | |
| 139 | /* When a port is added or removed or when certain port flags |
| 140 | * change, this function is called to automatically manage |
| 141 | * promiscuity setting of all the bridge ports. We are always called |
| 142 | * under RTNL so can skip using rcu primitives. |
| 143 | */ |
| 144 | void br_manage_promisc(struct net_bridge *br) |
| 145 | { |
| 146 | struct net_bridge_port *p; |
| 147 | bool set_all = false; |
| 148 | |
| 149 | /* If vlan filtering is disabled or bridge interface is placed |
| 150 | * into promiscuous mode, place all ports in promiscuous mode. |
| 151 | */ |
| 152 | if ((br->dev->flags & IFF_PROMISC) || !br_vlan_enabled(br->dev)) |
| 153 | set_all = true; |
| 154 | |
| 155 | list_for_each_entry(p, &br->port_list, list) { |
| 156 | if (set_all) { |
| 157 | br_port_set_promisc(p); |
| 158 | } else { |
| 159 | /* If the number of auto-ports is <= 1, then all other |
| 160 | * ports will have their output configuration |
| 161 | * statically specified through fdbs. Since ingress |
| 162 | * on the auto-port becomes forwarding/egress to other |
| 163 | * ports and egress configuration is statically known, |
| 164 | * we can say that ingress configuration of the |
| 165 | * auto-port is also statically known. |
| 166 | * This lets us disable promiscuous mode and write |
| 167 | * this config to hw. |
| 168 | */ |
| 169 | if (br->auto_cnt == 0 || |
| 170 | (br->auto_cnt == 1 && br_auto_port(p))) |
| 171 | br_port_clear_promisc(p); |
| 172 | else |
| 173 | br_port_set_promisc(p); |
| 174 | } |
| 175 | } |
| 176 | } |
| 177 | |
| 178 | int nbp_backup_change(struct net_bridge_port *p, |
| 179 | struct net_device *backup_dev) |
| 180 | { |
| 181 | struct net_bridge_port *old_backup = rtnl_dereference(p->backup_port); |
| 182 | struct net_bridge_port *backup_p = NULL; |
| 183 | |
| 184 | ASSERT_RTNL(); |
| 185 | |
| 186 | if (backup_dev) { |
| 187 | if (!netif_is_bridge_port(backup_dev)) |
| 188 | return -ENOENT; |
| 189 | |
| 190 | backup_p = br_port_get_rtnl(backup_dev); |
| 191 | if (backup_p->br != p->br) |
| 192 | return -EINVAL; |
| 193 | } |
| 194 | |
| 195 | if (p == backup_p) |
| 196 | return -EINVAL; |
| 197 | |
| 198 | if (old_backup == backup_p) |
| 199 | return 0; |
| 200 | |
| 201 | /* if the backup link is already set, clear it */ |
| 202 | if (old_backup) |
| 203 | old_backup->backup_redirected_cnt--; |
| 204 | |
| 205 | if (backup_p) |
| 206 | backup_p->backup_redirected_cnt++; |
| 207 | rcu_assign_pointer(p->backup_port, backup_p); |
| 208 | |
| 209 | return 0; |
| 210 | } |
| 211 | |
| 212 | static void nbp_backup_clear(struct net_bridge_port *p) |
| 213 | { |
| 214 | nbp_backup_change(p, NULL); |
| 215 | if (p->backup_redirected_cnt) { |
| 216 | struct net_bridge_port *cur_p; |
| 217 | |
| 218 | list_for_each_entry(cur_p, &p->br->port_list, list) { |
| 219 | struct net_bridge_port *backup_p; |
| 220 | |
| 221 | backup_p = rtnl_dereference(cur_p->backup_port); |
| 222 | if (backup_p == p) |
| 223 | nbp_backup_change(cur_p, NULL); |
| 224 | } |
| 225 | } |
| 226 | |
| 227 | WARN_ON(rcu_access_pointer(p->backup_port) || p->backup_redirected_cnt); |
| 228 | } |
| 229 | |
| 230 | static void nbp_update_port_count(struct net_bridge *br) |
| 231 | { |
| 232 | struct net_bridge_port *p; |
| 233 | u32 cnt = 0; |
| 234 | |
| 235 | list_for_each_entry(p, &br->port_list, list) { |
| 236 | if (br_auto_port(p)) |
| 237 | cnt++; |
| 238 | } |
| 239 | if (br->auto_cnt != cnt) { |
| 240 | br->auto_cnt = cnt; |
| 241 | br_manage_promisc(br); |
| 242 | } |
| 243 | } |
| 244 | |
| 245 | static void nbp_delete_promisc(struct net_bridge_port *p) |
| 246 | { |
| 247 | /* If port is currently promiscuous, unset promiscuity. |
| 248 | * Otherwise, it is a static port so remove all addresses |
| 249 | * from it. |
| 250 | */ |
| 251 | dev_set_allmulti(p->dev, -1); |
| 252 | if (br_promisc_port(p)) |
| 253 | dev_set_promiscuity(p->dev, -1); |
| 254 | else |
| 255 | br_fdb_unsync_static(p->br, p); |
| 256 | } |
| 257 | |
| 258 | static void release_nbp(struct kobject *kobj) |
| 259 | { |
| 260 | struct net_bridge_port *p |
| 261 | = container_of(kobj, struct net_bridge_port, kobj); |
| 262 | kfree(p); |
| 263 | } |
| 264 | |
| 265 | static void brport_get_ownership(const struct kobject *kobj, kuid_t *uid, kgid_t *gid) |
| 266 | { |
| 267 | struct net_bridge_port *p = kobj_to_brport(kobj); |
| 268 | |
| 269 | net_ns_get_ownership(dev_net(p->dev), uid, gid); |
| 270 | } |
| 271 | |
| 272 | static const struct kobj_type brport_ktype = { |
| 273 | #ifdef CONFIG_SYSFS |
| 274 | .sysfs_ops = &brport_sysfs_ops, |
| 275 | #endif |
| 276 | .release = release_nbp, |
| 277 | .get_ownership = brport_get_ownership, |
| 278 | }; |
| 279 | |
| 280 | static void destroy_nbp(struct net_bridge_port *p) |
| 281 | { |
| 282 | struct net_device *dev = p->dev; |
| 283 | |
| 284 | p->br = NULL; |
| 285 | p->dev = NULL; |
| 286 | netdev_put(dev, &p->dev_tracker); |
| 287 | |
| 288 | kobject_put(&p->kobj); |
| 289 | } |
| 290 | |
| 291 | static void destroy_nbp_rcu(struct rcu_head *head) |
| 292 | { |
| 293 | struct net_bridge_port *p = |
| 294 | container_of(head, struct net_bridge_port, rcu); |
| 295 | destroy_nbp(p); |
| 296 | } |
| 297 | |
| 298 | static unsigned get_max_headroom(struct net_bridge *br) |
| 299 | { |
| 300 | unsigned max_headroom = 0; |
| 301 | struct net_bridge_port *p; |
| 302 | |
| 303 | list_for_each_entry(p, &br->port_list, list) { |
| 304 | unsigned dev_headroom = netdev_get_fwd_headroom(p->dev); |
| 305 | |
| 306 | if (dev_headroom > max_headroom) |
| 307 | max_headroom = dev_headroom; |
| 308 | } |
| 309 | |
| 310 | return max_headroom; |
| 311 | } |
| 312 | |
| 313 | static void update_headroom(struct net_bridge *br, int new_hr) |
| 314 | { |
| 315 | struct net_bridge_port *p; |
| 316 | |
| 317 | list_for_each_entry(p, &br->port_list, list) |
| 318 | netdev_set_rx_headroom(p->dev, new_hr); |
| 319 | |
| 320 | br->dev->needed_headroom = new_hr; |
| 321 | } |
| 322 | |
| 323 | /* Delete port(interface) from bridge is done in two steps. |
| 324 | * via RCU. First step, marks device as down. That deletes |
| 325 | * all the timers and stops new packets from flowing through. |
| 326 | * |
| 327 | * Final cleanup doesn't occur until after all CPU's finished |
| 328 | * processing packets. |
| 329 | * |
| 330 | * Protected from multiple admin operations by RTNL mutex |
| 331 | */ |
| 332 | static void del_nbp(struct net_bridge_port *p) |
| 333 | { |
| 334 | struct net_bridge *br = p->br; |
| 335 | struct net_device *dev = p->dev; |
| 336 | |
| 337 | sysfs_remove_link(br->ifobj, p->dev->name); |
| 338 | |
| 339 | nbp_delete_promisc(p); |
| 340 | |
| 341 | spin_lock_bh(&br->lock); |
| 342 | br_stp_disable_port(p); |
| 343 | spin_unlock_bh(&br->lock); |
| 344 | |
| 345 | br_mrp_port_del(br, p); |
| 346 | br_cfm_port_del(br, p); |
| 347 | |
| 348 | br_ifinfo_notify(RTM_DELLINK, NULL, p); |
| 349 | |
| 350 | list_del_rcu(&p->list); |
| 351 | if (netdev_get_fwd_headroom(dev) == br->dev->needed_headroom) |
| 352 | update_headroom(br, get_max_headroom(br)); |
| 353 | netdev_reset_rx_headroom(dev); |
| 354 | |
| 355 | nbp_vlan_flush(p); |
| 356 | br_fdb_delete_by_port(br, p, 0, 1); |
| 357 | switchdev_deferred_process(); |
| 358 | nbp_backup_clear(p); |
| 359 | |
| 360 | nbp_update_port_count(br); |
| 361 | |
| 362 | netdev_upper_dev_unlink(dev, br->dev); |
| 363 | |
| 364 | dev->priv_flags &= ~IFF_BRIDGE_PORT; |
| 365 | |
| 366 | netdev_rx_handler_unregister(dev); |
| 367 | |
| 368 | br_multicast_del_port(p); |
| 369 | |
| 370 | kobject_uevent(&p->kobj, KOBJ_REMOVE); |
| 371 | kobject_del(&p->kobj); |
| 372 | |
| 373 | br_netpoll_disable(p); |
| 374 | |
| 375 | call_rcu(&p->rcu, destroy_nbp_rcu); |
| 376 | } |
| 377 | |
| 378 | /* Delete bridge device */ |
| 379 | void br_dev_delete(struct net_device *dev, struct list_head *head) |
| 380 | { |
| 381 | struct net_bridge *br = netdev_priv(dev); |
| 382 | struct net_bridge_port *p, *n; |
| 383 | |
| 384 | list_for_each_entry_safe(p, n, &br->port_list, list) { |
| 385 | del_nbp(p); |
| 386 | } |
| 387 | |
| 388 | br_recalculate_neigh_suppress_enabled(br); |
| 389 | |
| 390 | br_fdb_delete_by_port(br, NULL, 0, 1); |
| 391 | |
| 392 | cancel_delayed_work_sync(&br->gc_work); |
| 393 | |
| 394 | br_sysfs_delbr(br->dev); |
| 395 | unregister_netdevice_queue(br->dev, head); |
| 396 | } |
| 397 | |
| 398 | /* find an available port number */ |
| 399 | static int find_portno(struct net_bridge *br) |
| 400 | { |
| 401 | int index; |
| 402 | struct net_bridge_port *p; |
| 403 | unsigned long *inuse; |
| 404 | |
| 405 | inuse = bitmap_zalloc(BR_MAX_PORTS, GFP_KERNEL); |
| 406 | if (!inuse) |
| 407 | return -ENOMEM; |
| 408 | |
| 409 | __set_bit(0, inuse); /* zero is reserved */ |
| 410 | list_for_each_entry(p, &br->port_list, list) |
| 411 | __set_bit(p->port_no, inuse); |
| 412 | |
| 413 | index = find_first_zero_bit(inuse, BR_MAX_PORTS); |
| 414 | bitmap_free(inuse); |
| 415 | |
| 416 | return (index >= BR_MAX_PORTS) ? -EXFULL : index; |
| 417 | } |
| 418 | |
| 419 | /* called with RTNL but without bridge lock */ |
| 420 | static struct net_bridge_port *new_nbp(struct net_bridge *br, |
| 421 | struct net_device *dev) |
| 422 | { |
| 423 | struct net_bridge_port *p; |
| 424 | int index, err; |
| 425 | |
| 426 | index = find_portno(br); |
| 427 | if (index < 0) |
| 428 | return ERR_PTR(index); |
| 429 | |
| 430 | p = kzalloc(sizeof(*p), GFP_KERNEL); |
| 431 | if (p == NULL) |
| 432 | return ERR_PTR(-ENOMEM); |
| 433 | |
| 434 | p->br = br; |
| 435 | netdev_hold(dev, &p->dev_tracker, GFP_KERNEL); |
| 436 | p->dev = dev; |
| 437 | p->path_cost = port_cost(dev); |
| 438 | p->priority = 0x8000 >> BR_PORT_BITS; |
| 439 | p->port_no = index; |
| 440 | p->flags = BR_LEARNING | BR_FLOOD | BR_MCAST_FLOOD | BR_BCAST_FLOOD; |
| 441 | br_init_port(p); |
| 442 | br_set_state(p, BR_STATE_DISABLED); |
| 443 | br_stp_port_timer_init(p); |
| 444 | err = br_multicast_add_port(p); |
| 445 | if (err) { |
| 446 | netdev_put(dev, &p->dev_tracker); |
| 447 | kfree(p); |
| 448 | p = ERR_PTR(err); |
| 449 | } |
| 450 | |
| 451 | return p; |
| 452 | } |
| 453 | |
| 454 | int br_add_bridge(struct net *net, const char *name) |
| 455 | { |
| 456 | struct net_device *dev; |
| 457 | int res; |
| 458 | |
| 459 | dev = alloc_netdev(sizeof(struct net_bridge), name, NET_NAME_UNKNOWN, |
| 460 | br_dev_setup); |
| 461 | |
| 462 | if (!dev) |
| 463 | return -ENOMEM; |
| 464 | |
| 465 | dev_net_set(dev, net); |
| 466 | dev->rtnl_link_ops = &br_link_ops; |
| 467 | |
| 468 | res = register_netdevice(dev); |
| 469 | if (res) |
| 470 | free_netdev(dev); |
| 471 | return res; |
| 472 | } |
| 473 | |
| 474 | int br_del_bridge(struct net *net, const char *name) |
| 475 | { |
| 476 | struct net_device *dev; |
| 477 | int ret = 0; |
| 478 | |
| 479 | dev = __dev_get_by_name(net, name); |
| 480 | if (dev == NULL) |
| 481 | ret = -ENXIO; /* Could not find device */ |
| 482 | |
| 483 | else if (!netif_is_bridge_master(dev)) { |
| 484 | /* Attempt to delete non bridge device! */ |
| 485 | ret = -EPERM; |
| 486 | } |
| 487 | |
| 488 | else if (dev->flags & IFF_UP) { |
| 489 | /* Not shutdown yet. */ |
| 490 | ret = -EBUSY; |
| 491 | } |
| 492 | |
| 493 | else |
| 494 | br_dev_delete(dev, NULL); |
| 495 | |
| 496 | return ret; |
| 497 | } |
| 498 | |
| 499 | /* MTU of the bridge pseudo-device: ETH_DATA_LEN or the minimum of the ports */ |
| 500 | static int br_mtu_min(const struct net_bridge *br) |
| 501 | { |
| 502 | const struct net_bridge_port *p; |
| 503 | int ret_mtu = 0; |
| 504 | |
| 505 | list_for_each_entry(p, &br->port_list, list) |
| 506 | if (!ret_mtu || ret_mtu > p->dev->mtu) |
| 507 | ret_mtu = p->dev->mtu; |
| 508 | |
| 509 | return ret_mtu ? ret_mtu : ETH_DATA_LEN; |
| 510 | } |
| 511 | |
| 512 | void br_mtu_auto_adjust(struct net_bridge *br) |
| 513 | { |
| 514 | ASSERT_RTNL(); |
| 515 | |
| 516 | /* if the bridge MTU was manually configured don't mess with it */ |
| 517 | if (br_opt_get(br, BROPT_MTU_SET_BY_USER)) |
| 518 | return; |
| 519 | |
| 520 | /* change to the minimum MTU and clear the flag which was set by |
| 521 | * the bridge ndo_change_mtu callback |
| 522 | */ |
| 523 | dev_set_mtu(br->dev, br_mtu_min(br)); |
| 524 | br_opt_toggle(br, BROPT_MTU_SET_BY_USER, false); |
| 525 | } |
| 526 | |
| 527 | static void br_set_gso_limits(struct net_bridge *br) |
| 528 | { |
| 529 | unsigned int tso_max_size = TSO_MAX_SIZE; |
| 530 | const struct net_bridge_port *p; |
| 531 | u16 tso_max_segs = TSO_MAX_SEGS; |
| 532 | |
| 533 | list_for_each_entry(p, &br->port_list, list) { |
| 534 | tso_max_size = min(tso_max_size, p->dev->tso_max_size); |
| 535 | tso_max_segs = min(tso_max_segs, p->dev->tso_max_segs); |
| 536 | } |
| 537 | netif_set_tso_max_size(br->dev, tso_max_size); |
| 538 | netif_set_tso_max_segs(br->dev, tso_max_segs); |
| 539 | } |
| 540 | |
| 541 | /* |
| 542 | * Recomputes features using slave's features |
| 543 | */ |
| 544 | netdev_features_t br_features_recompute(struct net_bridge *br, |
| 545 | netdev_features_t features) |
| 546 | { |
| 547 | struct net_bridge_port *p; |
| 548 | netdev_features_t mask; |
| 549 | |
| 550 | if (list_empty(&br->port_list)) |
| 551 | return features; |
| 552 | |
| 553 | mask = features; |
| 554 | features &= ~NETIF_F_ONE_FOR_ALL; |
| 555 | |
| 556 | list_for_each_entry(p, &br->port_list, list) { |
| 557 | features = netdev_increment_features(features, |
| 558 | p->dev->features, mask); |
| 559 | } |
| 560 | features = netdev_add_tso_features(features, mask); |
| 561 | |
| 562 | return features; |
| 563 | } |
| 564 | |
| 565 | /* called with RTNL */ |
| 566 | int br_add_if(struct net_bridge *br, struct net_device *dev, |
| 567 | struct netlink_ext_ack *extack) |
| 568 | { |
| 569 | struct net_bridge_port *p; |
| 570 | int err = 0; |
| 571 | unsigned br_hr, dev_hr; |
| 572 | bool changed_addr, fdb_synced = false; |
| 573 | |
| 574 | /* Don't allow bridging non-ethernet like devices. */ |
| 575 | if ((dev->flags & IFF_LOOPBACK) || |
| 576 | dev->type != ARPHRD_ETHER || dev->addr_len != ETH_ALEN || |
| 577 | !is_valid_ether_addr(dev->dev_addr)) |
| 578 | return -EINVAL; |
| 579 | |
| 580 | /* No bridging of bridges */ |
| 581 | if (dev->netdev_ops->ndo_start_xmit == br_dev_xmit) { |
| 582 | NL_SET_ERR_MSG(extack, |
| 583 | "Can not enslave a bridge to a bridge"); |
| 584 | return -ELOOP; |
| 585 | } |
| 586 | |
| 587 | /* Device has master upper dev */ |
| 588 | if (netdev_master_upper_dev_get(dev)) |
| 589 | return -EBUSY; |
| 590 | |
| 591 | /* No bridging devices that dislike that (e.g. wireless) */ |
| 592 | if (dev->priv_flags & IFF_DONT_BRIDGE) { |
| 593 | NL_SET_ERR_MSG(extack, |
| 594 | "Device does not allow enslaving to a bridge"); |
| 595 | return -EOPNOTSUPP; |
| 596 | } |
| 597 | |
| 598 | p = new_nbp(br, dev); |
| 599 | if (IS_ERR(p)) |
| 600 | return PTR_ERR(p); |
| 601 | |
| 602 | call_netdevice_notifiers(NETDEV_JOIN, dev); |
| 603 | |
| 604 | err = dev_set_allmulti(dev, 1); |
| 605 | if (err) { |
| 606 | br_multicast_del_port(p); |
| 607 | netdev_put(dev, &p->dev_tracker); |
| 608 | kfree(p); /* kobject not yet init'd, manually free */ |
| 609 | goto err1; |
| 610 | } |
| 611 | |
| 612 | err = kobject_init_and_add(&p->kobj, &brport_ktype, &(dev->dev.kobj), |
| 613 | SYSFS_BRIDGE_PORT_ATTR); |
| 614 | if (err) |
| 615 | goto err2; |
| 616 | |
| 617 | err = br_sysfs_addif(p); |
| 618 | if (err) |
| 619 | goto err2; |
| 620 | |
| 621 | err = br_netpoll_enable(p); |
| 622 | if (err) |
| 623 | goto err3; |
| 624 | |
| 625 | err = netdev_rx_handler_register(dev, br_get_rx_handler(dev), p); |
| 626 | if (err) |
| 627 | goto err4; |
| 628 | |
| 629 | dev->priv_flags |= IFF_BRIDGE_PORT; |
| 630 | |
| 631 | err = netdev_master_upper_dev_link(dev, br->dev, NULL, NULL, extack); |
| 632 | if (err) |
| 633 | goto err5; |
| 634 | |
| 635 | dev_disable_lro(dev); |
| 636 | |
| 637 | list_add_rcu(&p->list, &br->port_list); |
| 638 | |
| 639 | nbp_update_port_count(br); |
| 640 | if (!br_promisc_port(p) && (p->dev->priv_flags & IFF_UNICAST_FLT)) { |
| 641 | /* When updating the port count we also update all ports' |
| 642 | * promiscuous mode. |
| 643 | * A port leaving promiscuous mode normally gets the bridge's |
| 644 | * fdb synced to the unicast filter (if supported), however, |
| 645 | * `br_port_clear_promisc` does not distinguish between |
| 646 | * non-promiscuous ports and *new* ports, so we need to |
| 647 | * sync explicitly here. |
| 648 | */ |
| 649 | fdb_synced = br_fdb_sync_static(br, p) == 0; |
| 650 | if (!fdb_synced) |
| 651 | netdev_err(dev, "failed to sync bridge static fdb addresses to this port\n"); |
| 652 | } |
| 653 | |
| 654 | netdev_update_features(br->dev); |
| 655 | |
| 656 | br_hr = br->dev->needed_headroom; |
| 657 | dev_hr = netdev_get_fwd_headroom(dev); |
| 658 | if (br_hr < dev_hr) |
| 659 | update_headroom(br, dev_hr); |
| 660 | else |
| 661 | netdev_set_rx_headroom(dev, br_hr); |
| 662 | |
| 663 | if (br_fdb_add_local(br, p, dev->dev_addr, 0)) |
| 664 | netdev_err(dev, "failed insert local address bridge forwarding table\n"); |
| 665 | |
| 666 | if (br->dev->addr_assign_type != NET_ADDR_SET) { |
| 667 | /* Ask for permission to use this MAC address now, even if we |
| 668 | * don't end up choosing it below. |
| 669 | */ |
| 670 | err = dev_pre_changeaddr_notify(br->dev, dev->dev_addr, extack); |
| 671 | if (err) |
| 672 | goto err6; |
| 673 | } |
| 674 | |
| 675 | err = nbp_vlan_init(p, extack); |
| 676 | if (err) { |
| 677 | netdev_err(dev, "failed to initialize vlan filtering on this port\n"); |
| 678 | goto err6; |
| 679 | } |
| 680 | |
| 681 | spin_lock_bh(&br->lock); |
| 682 | changed_addr = br_stp_recalculate_bridge_id(br); |
| 683 | |
| 684 | if (netif_running(dev) && netif_oper_up(dev) && |
| 685 | (br->dev->flags & IFF_UP)) |
| 686 | br_stp_enable_port(p); |
| 687 | spin_unlock_bh(&br->lock); |
| 688 | |
| 689 | br_ifinfo_notify(RTM_NEWLINK, NULL, p); |
| 690 | |
| 691 | if (changed_addr) |
| 692 | call_netdevice_notifiers(NETDEV_CHANGEADDR, br->dev); |
| 693 | |
| 694 | br_mtu_auto_adjust(br); |
| 695 | br_set_gso_limits(br); |
| 696 | |
| 697 | kobject_uevent(&p->kobj, KOBJ_ADD); |
| 698 | |
| 699 | return 0; |
| 700 | |
| 701 | err6: |
| 702 | if (fdb_synced) |
| 703 | br_fdb_unsync_static(br, p); |
| 704 | list_del_rcu(&p->list); |
| 705 | br_fdb_delete_by_port(br, p, 0, 1); |
| 706 | nbp_update_port_count(br); |
| 707 | netdev_upper_dev_unlink(dev, br->dev); |
| 708 | err5: |
| 709 | dev->priv_flags &= ~IFF_BRIDGE_PORT; |
| 710 | netdev_rx_handler_unregister(dev); |
| 711 | err4: |
| 712 | br_netpoll_disable(p); |
| 713 | err3: |
| 714 | sysfs_remove_link(br->ifobj, p->dev->name); |
| 715 | err2: |
| 716 | br_multicast_del_port(p); |
| 717 | netdev_put(dev, &p->dev_tracker); |
| 718 | kobject_put(&p->kobj); |
| 719 | dev_set_allmulti(dev, -1); |
| 720 | err1: |
| 721 | return err; |
| 722 | } |
| 723 | |
| 724 | /* called with RTNL */ |
| 725 | int br_del_if(struct net_bridge *br, struct net_device *dev) |
| 726 | { |
| 727 | struct net_bridge_port *p; |
| 728 | bool changed_addr; |
| 729 | |
| 730 | p = br_port_get_rtnl(dev); |
| 731 | if (!p || p->br != br) |
| 732 | return -EINVAL; |
| 733 | |
| 734 | /* Since more than one interface can be attached to a bridge, |
| 735 | * there still maybe an alternate path for netconsole to use; |
| 736 | * therefore there is no reason for a NETDEV_RELEASE event. |
| 737 | */ |
| 738 | del_nbp(p); |
| 739 | |
| 740 | br_mtu_auto_adjust(br); |
| 741 | br_set_gso_limits(br); |
| 742 | |
| 743 | spin_lock_bh(&br->lock); |
| 744 | changed_addr = br_stp_recalculate_bridge_id(br); |
| 745 | spin_unlock_bh(&br->lock); |
| 746 | |
| 747 | if (changed_addr) |
| 748 | call_netdevice_notifiers(NETDEV_CHANGEADDR, br->dev); |
| 749 | |
| 750 | netdev_update_features(br->dev); |
| 751 | |
| 752 | return 0; |
| 753 | } |
| 754 | |
| 755 | void br_port_flags_change(struct net_bridge_port *p, unsigned long mask) |
| 756 | { |
| 757 | struct net_bridge *br = p->br; |
| 758 | |
| 759 | if (mask & BR_AUTO_MASK) |
| 760 | nbp_update_port_count(br); |
| 761 | |
| 762 | if (mask & BR_NEIGH_SUPPRESS) |
| 763 | br_recalculate_neigh_suppress_enabled(br); |
| 764 | } |
| 765 | |
| 766 | bool br_port_flag_is_set(const struct net_device *dev, unsigned long flag) |
| 767 | { |
| 768 | struct net_bridge_port *p; |
| 769 | |
| 770 | p = br_port_get_rtnl_rcu(dev); |
| 771 | if (!p) |
| 772 | return false; |
| 773 | |
| 774 | return p->flags & flag; |
| 775 | } |
| 776 | EXPORT_SYMBOL_GPL(br_port_flag_is_set); |