1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 /* 3 * Linux ethernet bridge 4 * 5 * Authors: 6 * Lennert Buytenhek <buytenh@gnu.org> 7 */ 8 9 #ifndef _BR_PRIVATE_H 10 #define _BR_PRIVATE_H 11 12 #include <linux/netdevice.h> 13 #include <linux/if_bridge.h> 14 #include <linux/netpoll.h> 15 #include <linux/u64_stats_sync.h> 16 #include <net/route.h> 17 #include <net/ip6_fib.h> 18 #include <linux/if_vlan.h> 19 #include <linux/rhashtable.h> 20 #include <linux/refcount.h> 21 22 #define BR_HASH_BITS 8 23 #define BR_HASH_SIZE (1 << BR_HASH_BITS) 24 25 #define BR_HOLD_TIME (1*HZ) 26 27 #define BR_PORT_BITS 10 28 #define BR_MAX_PORTS (1<<BR_PORT_BITS) 29 30 #define BR_MULTICAST_DEFAULT_HASH_MAX 4096 31 32 #define BR_VERSION "2.3" 33 34 /* Control of forwarding link local multicast */ 35 #define BR_GROUPFWD_DEFAULT 0 36 /* Don't allow forwarding of control protocols like STP, MAC PAUSE and LACP */ 37 enum { 38 BR_GROUPFWD_STP = BIT(0), 39 BR_GROUPFWD_MACPAUSE = BIT(1), 40 BR_GROUPFWD_LACP = BIT(2), 41 }; 42 43 #define BR_GROUPFWD_RESTRICTED (BR_GROUPFWD_STP | BR_GROUPFWD_MACPAUSE | \ 44 BR_GROUPFWD_LACP) 45 /* The Nearest Customer Bridge Group Address, 01-80-C2-00-00-[00,0B,0C,0D,0F] */ 46 #define BR_GROUPFWD_8021AD 0xB801u 47 48 /* Path to usermode spanning tree program */ 49 #define BR_STP_PROG "/sbin/bridge-stp" 50 51 typedef struct bridge_id bridge_id; 52 typedef struct mac_addr mac_addr; 53 typedef __u16 port_id; 54 55 struct bridge_id { 56 unsigned char prio[2]; 57 unsigned char addr[ETH_ALEN]; 58 }; 59 60 struct mac_addr { 61 unsigned char addr[ETH_ALEN]; 62 }; 63 64 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 65 /* our own querier */ 66 struct bridge_mcast_own_query { 67 struct timer_list timer; 68 u32 startup_sent; 69 }; 70 71 /* other querier */ 72 struct bridge_mcast_other_query { 73 struct timer_list timer; 74 unsigned long delay_time; 75 }; 76 77 /* selected querier */ 78 struct bridge_mcast_querier { 79 struct br_ip addr; 80 struct net_bridge_port __rcu *port; 81 }; 82 83 /* IGMP/MLD statistics */ 84 struct bridge_mcast_stats { 85 struct br_mcast_stats mstats; 86 struct u64_stats_sync syncp; 87 }; 88 #endif 89 90 struct br_vlan_stats { 91 u64 rx_bytes; 92 u64 rx_packets; 93 u64 tx_bytes; 94 u64 tx_packets; 95 struct u64_stats_sync syncp; 96 }; 97 98 struct br_tunnel_info { 99 __be64 tunnel_id; 100 struct metadata_dst *tunnel_dst; 101 }; 102 103 /* private vlan flags */ 104 enum { 105 BR_VLFLAG_PER_PORT_STATS = BIT(0), 106 BR_VLFLAG_ADDED_BY_SWITCHDEV = BIT(1), 107 }; 108 109 /** 110 * struct net_bridge_vlan - per-vlan entry 111 * 112 * @vnode: rhashtable member 113 * @vid: VLAN id 114 * @flags: bridge vlan flags 115 * @priv_flags: private (in-kernel) bridge vlan flags 116 * @stats: per-cpu VLAN statistics 117 * @br: if MASTER flag set, this points to a bridge struct 118 * @port: if MASTER flag unset, this points to a port struct 119 * @refcnt: if MASTER flag set, this is bumped for each port referencing it 120 * @brvlan: if MASTER flag unset, this points to the global per-VLAN context 121 * for this VLAN entry 122 * @vlist: sorted list of VLAN entries 123 * @rcu: used for entry destruction 124 * 125 * This structure is shared between the global per-VLAN entries contained in 126 * the bridge rhashtable and the local per-port per-VLAN entries contained in 127 * the port's rhashtable. The union entries should be interpreted depending on 128 * the entry flags that are set. 129 */ 130 struct net_bridge_vlan { 131 struct rhash_head vnode; 132 struct rhash_head tnode; 133 u16 vid; 134 u16 flags; 135 u16 priv_flags; 136 struct br_vlan_stats __percpu *stats; 137 union { 138 struct net_bridge *br; 139 struct net_bridge_port *port; 140 }; 141 union { 142 refcount_t refcnt; 143 struct net_bridge_vlan *brvlan; 144 }; 145 146 struct br_tunnel_info tinfo; 147 148 struct list_head vlist; 149 150 struct rcu_head rcu; 151 }; 152 153 /** 154 * struct net_bridge_vlan_group 155 * 156 * @vlan_hash: VLAN entry rhashtable 157 * @vlan_list: sorted VLAN entry list 158 * @num_vlans: number of total VLAN entries 159 * @pvid: PVID VLAN id 160 * 161 * IMPORTANT: Be careful when checking if there're VLAN entries using list 162 * primitives because the bridge can have entries in its list which 163 * are just for global context but not for filtering, i.e. they have 164 * the master flag set but not the brentry flag. If you have to check 165 * if there're "real" entries in the bridge please test @num_vlans 166 */ 167 struct net_bridge_vlan_group { 168 struct rhashtable vlan_hash; 169 struct rhashtable tunnel_hash; 170 struct list_head vlan_list; 171 u16 num_vlans; 172 u16 pvid; 173 }; 174 175 struct net_bridge_fdb_key { 176 mac_addr addr; 177 u16 vlan_id; 178 }; 179 180 struct net_bridge_fdb_entry { 181 struct rhash_head rhnode; 182 struct net_bridge_port *dst; 183 184 struct net_bridge_fdb_key key; 185 struct hlist_node fdb_node; 186 unsigned char is_local:1, 187 is_static:1, 188 is_sticky:1, 189 added_by_user:1, 190 added_by_external_learn:1, 191 offloaded:1; 192 193 /* write-heavy members should not affect lookups */ 194 unsigned long updated ____cacheline_aligned_in_smp; 195 unsigned long used; 196 197 struct rcu_head rcu; 198 }; 199 200 #define MDB_PG_FLAGS_PERMANENT BIT(0) 201 #define MDB_PG_FLAGS_OFFLOAD BIT(1) 202 203 struct net_bridge_port_group { 204 struct net_bridge_port *port; 205 struct net_bridge_port_group __rcu *next; 206 struct hlist_node mglist; 207 struct rcu_head rcu; 208 struct timer_list timer; 209 struct br_ip addr; 210 unsigned char flags; 211 unsigned char eth_addr[ETH_ALEN]; 212 }; 213 214 struct net_bridge_mdb_entry { 215 struct rhash_head rhnode; 216 struct net_bridge *br; 217 struct net_bridge_port_group __rcu *ports; 218 struct rcu_head rcu; 219 struct timer_list timer; 220 struct br_ip addr; 221 bool host_joined; 222 struct hlist_node mdb_node; 223 }; 224 225 struct net_bridge_port { 226 struct net_bridge *br; 227 struct net_device *dev; 228 struct list_head list; 229 230 unsigned long flags; 231 #ifdef CONFIG_BRIDGE_VLAN_FILTERING 232 struct net_bridge_vlan_group __rcu *vlgrp; 233 #endif 234 struct net_bridge_port __rcu *backup_port; 235 236 /* STP */ 237 u8 priority; 238 u8 state; 239 u16 port_no; 240 unsigned char topology_change_ack; 241 unsigned char config_pending; 242 port_id port_id; 243 port_id designated_port; 244 bridge_id designated_root; 245 bridge_id designated_bridge; 246 u32 path_cost; 247 u32 designated_cost; 248 unsigned long designated_age; 249 250 struct timer_list forward_delay_timer; 251 struct timer_list hold_timer; 252 struct timer_list message_age_timer; 253 struct kobject kobj; 254 struct rcu_head rcu; 255 256 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 257 struct bridge_mcast_own_query ip4_own_query; 258 #if IS_ENABLED(CONFIG_IPV6) 259 struct bridge_mcast_own_query ip6_own_query; 260 #endif /* IS_ENABLED(CONFIG_IPV6) */ 261 unsigned char multicast_router; 262 struct bridge_mcast_stats __percpu *mcast_stats; 263 struct timer_list multicast_router_timer; 264 struct hlist_head mglist; 265 struct hlist_node rlist; 266 #endif 267 268 #ifdef CONFIG_SYSFS 269 char sysfs_name[IFNAMSIZ]; 270 #endif 271 272 #ifdef CONFIG_NET_POLL_CONTROLLER 273 struct netpoll *np; 274 #endif 275 #ifdef CONFIG_NET_SWITCHDEV 276 int offload_fwd_mark; 277 #endif 278 u16 group_fwd_mask; 279 u16 backup_redirected_cnt; 280 }; 281 282 #define kobj_to_brport(obj) container_of(obj, struct net_bridge_port, kobj) 283 284 #define br_auto_port(p) ((p)->flags & BR_AUTO_MASK) 285 #define br_promisc_port(p) ((p)->flags & BR_PROMISC) 286 287 static inline struct net_bridge_port *br_port_get_rcu(const struct net_device *dev) 288 { 289 return rcu_dereference(dev->rx_handler_data); 290 } 291 292 static inline struct net_bridge_port *br_port_get_rtnl(const struct net_device *dev) 293 { 294 return netif_is_bridge_port(dev) ? 295 rtnl_dereference(dev->rx_handler_data) : NULL; 296 } 297 298 static inline struct net_bridge_port *br_port_get_rtnl_rcu(const struct net_device *dev) 299 { 300 return netif_is_bridge_port(dev) ? 301 rcu_dereference_rtnl(dev->rx_handler_data) : NULL; 302 } 303 304 enum net_bridge_opts { 305 BROPT_VLAN_ENABLED, 306 BROPT_VLAN_STATS_ENABLED, 307 BROPT_NF_CALL_IPTABLES, 308 BROPT_NF_CALL_IP6TABLES, 309 BROPT_NF_CALL_ARPTABLES, 310 BROPT_GROUP_ADDR_SET, 311 BROPT_MULTICAST_ENABLED, 312 BROPT_MULTICAST_QUERIER, 313 BROPT_MULTICAST_QUERY_USE_IFADDR, 314 BROPT_MULTICAST_STATS_ENABLED, 315 BROPT_HAS_IPV6_ADDR, 316 BROPT_NEIGH_SUPPRESS_ENABLED, 317 BROPT_MTU_SET_BY_USER, 318 BROPT_VLAN_STATS_PER_PORT, 319 BROPT_NO_LL_LEARN, 320 BROPT_VLAN_BRIDGE_BINDING, 321 }; 322 323 struct net_bridge { 324 spinlock_t lock; 325 spinlock_t hash_lock; 326 struct list_head port_list; 327 struct net_device *dev; 328 struct pcpu_sw_netstats __percpu *stats; 329 unsigned long options; 330 /* These fields are accessed on each packet */ 331 #ifdef CONFIG_BRIDGE_VLAN_FILTERING 332 __be16 vlan_proto; 333 u16 default_pvid; 334 struct net_bridge_vlan_group __rcu *vlgrp; 335 #endif 336 337 struct rhashtable fdb_hash_tbl; 338 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) 339 union { 340 struct rtable fake_rtable; 341 struct rt6_info fake_rt6_info; 342 }; 343 #endif 344 u16 group_fwd_mask; 345 u16 group_fwd_mask_required; 346 347 /* STP */ 348 bridge_id designated_root; 349 bridge_id bridge_id; 350 unsigned char topology_change; 351 unsigned char topology_change_detected; 352 u16 root_port; 353 unsigned long max_age; 354 unsigned long hello_time; 355 unsigned long forward_delay; 356 unsigned long ageing_time; 357 unsigned long bridge_max_age; 358 unsigned long bridge_hello_time; 359 unsigned long bridge_forward_delay; 360 unsigned long bridge_ageing_time; 361 u32 root_path_cost; 362 363 u8 group_addr[ETH_ALEN]; 364 365 enum { 366 BR_NO_STP, /* no spanning tree */ 367 BR_KERNEL_STP, /* old STP in kernel */ 368 BR_USER_STP, /* new RSTP in userspace */ 369 } stp_enabled; 370 371 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 372 373 u32 hash_max; 374 375 u32 multicast_last_member_count; 376 u32 multicast_startup_query_count; 377 378 u8 multicast_igmp_version; 379 u8 multicast_router; 380 #if IS_ENABLED(CONFIG_IPV6) 381 u8 multicast_mld_version; 382 #endif 383 spinlock_t multicast_lock; 384 unsigned long multicast_last_member_interval; 385 unsigned long multicast_membership_interval; 386 unsigned long multicast_querier_interval; 387 unsigned long multicast_query_interval; 388 unsigned long multicast_query_response_interval; 389 unsigned long multicast_startup_query_interval; 390 391 struct rhashtable mdb_hash_tbl; 392 393 struct hlist_head mdb_list; 394 struct hlist_head router_list; 395 396 struct timer_list multicast_router_timer; 397 struct bridge_mcast_other_query ip4_other_query; 398 struct bridge_mcast_own_query ip4_own_query; 399 struct bridge_mcast_querier ip4_querier; 400 struct bridge_mcast_stats __percpu *mcast_stats; 401 #if IS_ENABLED(CONFIG_IPV6) 402 struct bridge_mcast_other_query ip6_other_query; 403 struct bridge_mcast_own_query ip6_own_query; 404 struct bridge_mcast_querier ip6_querier; 405 #endif /* IS_ENABLED(CONFIG_IPV6) */ 406 #endif 407 408 struct timer_list hello_timer; 409 struct timer_list tcn_timer; 410 struct timer_list topology_change_timer; 411 struct delayed_work gc_work; 412 struct kobject *ifobj; 413 u32 auto_cnt; 414 415 #ifdef CONFIG_NET_SWITCHDEV 416 int offload_fwd_mark; 417 #endif 418 struct hlist_head fdb_list; 419 }; 420 421 struct br_input_skb_cb { 422 struct net_device *brdev; 423 424 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 425 u8 igmp; 426 u8 mrouters_only:1; 427 #endif 428 u8 proxyarp_replied:1; 429 u8 src_port_isolated:1; 430 #ifdef CONFIG_BRIDGE_VLAN_FILTERING 431 u8 vlan_filtered:1; 432 #endif 433 #ifdef CONFIG_NETFILTER_FAMILY_BRIDGE 434 u8 br_netfilter_broute:1; 435 #endif 436 437 #ifdef CONFIG_NET_SWITCHDEV 438 int offload_fwd_mark; 439 #endif 440 }; 441 442 #define BR_INPUT_SKB_CB(__skb) ((struct br_input_skb_cb *)(__skb)->cb) 443 444 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 445 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb) (BR_INPUT_SKB_CB(__skb)->mrouters_only) 446 #else 447 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb) (0) 448 #endif 449 450 #define br_printk(level, br, format, args...) \ 451 printk(level "%s: " format, (br)->dev->name, ##args) 452 453 #define br_err(__br, format, args...) \ 454 br_printk(KERN_ERR, __br, format, ##args) 455 #define br_warn(__br, format, args...) \ 456 br_printk(KERN_WARNING, __br, format, ##args) 457 #define br_notice(__br, format, args...) \ 458 br_printk(KERN_NOTICE, __br, format, ##args) 459 #define br_info(__br, format, args...) \ 460 br_printk(KERN_INFO, __br, format, ##args) 461 462 #define br_debug(br, format, args...) \ 463 pr_debug("%s: " format, (br)->dev->name, ##args) 464 465 /* called under bridge lock */ 466 static inline int br_is_root_bridge(const struct net_bridge *br) 467 { 468 return !memcmp(&br->bridge_id, &br->designated_root, 8); 469 } 470 471 /* check if a VLAN entry is global */ 472 static inline bool br_vlan_is_master(const struct net_bridge_vlan *v) 473 { 474 return v->flags & BRIDGE_VLAN_INFO_MASTER; 475 } 476 477 /* check if a VLAN entry is used by the bridge */ 478 static inline bool br_vlan_is_brentry(const struct net_bridge_vlan *v) 479 { 480 return v->flags & BRIDGE_VLAN_INFO_BRENTRY; 481 } 482 483 /* check if we should use the vlan entry, returns false if it's only context */ 484 static inline bool br_vlan_should_use(const struct net_bridge_vlan *v) 485 { 486 if (br_vlan_is_master(v)) { 487 if (br_vlan_is_brentry(v)) 488 return true; 489 else 490 return false; 491 } 492 493 return true; 494 } 495 496 static inline int br_opt_get(const struct net_bridge *br, 497 enum net_bridge_opts opt) 498 { 499 return test_bit(opt, &br->options); 500 } 501 502 int br_boolopt_toggle(struct net_bridge *br, enum br_boolopt_id opt, bool on, 503 struct netlink_ext_ack *extack); 504 int br_boolopt_get(const struct net_bridge *br, enum br_boolopt_id opt); 505 int br_boolopt_multi_toggle(struct net_bridge *br, 506 struct br_boolopt_multi *bm, 507 struct netlink_ext_ack *extack); 508 void br_boolopt_multi_get(const struct net_bridge *br, 509 struct br_boolopt_multi *bm); 510 void br_opt_toggle(struct net_bridge *br, enum net_bridge_opts opt, bool on); 511 512 /* br_device.c */ 513 void br_dev_setup(struct net_device *dev); 514 void br_dev_delete(struct net_device *dev, struct list_head *list); 515 netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev); 516 #ifdef CONFIG_NET_POLL_CONTROLLER 517 static inline void br_netpoll_send_skb(const struct net_bridge_port *p, 518 struct sk_buff *skb) 519 { 520 struct netpoll *np = p->np; 521 522 if (np) 523 netpoll_send_skb(np, skb); 524 } 525 526 int br_netpoll_enable(struct net_bridge_port *p); 527 void br_netpoll_disable(struct net_bridge_port *p); 528 #else 529 static inline void br_netpoll_send_skb(const struct net_bridge_port *p, 530 struct sk_buff *skb) 531 { 532 } 533 534 static inline int br_netpoll_enable(struct net_bridge_port *p) 535 { 536 return 0; 537 } 538 539 static inline void br_netpoll_disable(struct net_bridge_port *p) 540 { 541 } 542 #endif 543 544 /* br_fdb.c */ 545 int br_fdb_init(void); 546 void br_fdb_fini(void); 547 int br_fdb_hash_init(struct net_bridge *br); 548 void br_fdb_hash_fini(struct net_bridge *br); 549 void br_fdb_flush(struct net_bridge *br); 550 void br_fdb_find_delete_local(struct net_bridge *br, 551 const struct net_bridge_port *p, 552 const unsigned char *addr, u16 vid); 553 void br_fdb_changeaddr(struct net_bridge_port *p, const unsigned char *newaddr); 554 void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr); 555 void br_fdb_cleanup(struct work_struct *work); 556 void br_fdb_delete_by_port(struct net_bridge *br, 557 const struct net_bridge_port *p, u16 vid, int do_all); 558 struct net_bridge_fdb_entry *br_fdb_find_rcu(struct net_bridge *br, 559 const unsigned char *addr, 560 __u16 vid); 561 int br_fdb_test_addr(struct net_device *dev, unsigned char *addr); 562 int br_fdb_fillbuf(struct net_bridge *br, void *buf, unsigned long count, 563 unsigned long off); 564 int br_fdb_insert(struct net_bridge *br, struct net_bridge_port *source, 565 const unsigned char *addr, u16 vid); 566 void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source, 567 const unsigned char *addr, u16 vid, bool added_by_user); 568 569 int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[], 570 struct net_device *dev, const unsigned char *addr, u16 vid); 571 int br_fdb_add(struct ndmsg *nlh, struct nlattr *tb[], struct net_device *dev, 572 const unsigned char *addr, u16 vid, u16 nlh_flags, 573 struct netlink_ext_ack *extack); 574 int br_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb, 575 struct net_device *dev, struct net_device *fdev, int *idx); 576 int br_fdb_get(struct sk_buff *skb, struct nlattr *tb[], struct net_device *dev, 577 const unsigned char *addr, u16 vid, u32 portid, u32 seq, 578 struct netlink_ext_ack *extack); 579 int br_fdb_sync_static(struct net_bridge *br, struct net_bridge_port *p); 580 void br_fdb_unsync_static(struct net_bridge *br, struct net_bridge_port *p); 581 int br_fdb_external_learn_add(struct net_bridge *br, struct net_bridge_port *p, 582 const unsigned char *addr, u16 vid, 583 bool swdev_notify); 584 int br_fdb_external_learn_del(struct net_bridge *br, struct net_bridge_port *p, 585 const unsigned char *addr, u16 vid, 586 bool swdev_notify); 587 void br_fdb_offloaded_set(struct net_bridge *br, struct net_bridge_port *p, 588 const unsigned char *addr, u16 vid, bool offloaded); 589 590 /* br_forward.c */ 591 enum br_pkt_type { 592 BR_PKT_UNICAST, 593 BR_PKT_MULTICAST, 594 BR_PKT_BROADCAST 595 }; 596 int br_dev_queue_push_xmit(struct net *net, struct sock *sk, struct sk_buff *skb); 597 void br_forward(const struct net_bridge_port *to, struct sk_buff *skb, 598 bool local_rcv, bool local_orig); 599 int br_forward_finish(struct net *net, struct sock *sk, struct sk_buff *skb); 600 void br_flood(struct net_bridge *br, struct sk_buff *skb, 601 enum br_pkt_type pkt_type, bool local_rcv, bool local_orig); 602 603 /* return true if both source port and dest port are isolated */ 604 static inline bool br_skb_isolated(const struct net_bridge_port *to, 605 const struct sk_buff *skb) 606 { 607 return BR_INPUT_SKB_CB(skb)->src_port_isolated && 608 (to->flags & BR_ISOLATED); 609 } 610 611 /* br_if.c */ 612 void br_port_carrier_check(struct net_bridge_port *p, bool *notified); 613 int br_add_bridge(struct net *net, const char *name); 614 int br_del_bridge(struct net *net, const char *name); 615 int br_add_if(struct net_bridge *br, struct net_device *dev, 616 struct netlink_ext_ack *extack); 617 int br_del_if(struct net_bridge *br, struct net_device *dev); 618 void br_mtu_auto_adjust(struct net_bridge *br); 619 netdev_features_t br_features_recompute(struct net_bridge *br, 620 netdev_features_t features); 621 void br_port_flags_change(struct net_bridge_port *port, unsigned long mask); 622 void br_manage_promisc(struct net_bridge *br); 623 int nbp_backup_change(struct net_bridge_port *p, struct net_device *backup_dev); 624 625 /* br_input.c */ 626 int br_handle_frame_finish(struct net *net, struct sock *sk, struct sk_buff *skb); 627 rx_handler_result_t br_handle_frame(struct sk_buff **pskb); 628 629 static inline bool br_rx_handler_check_rcu(const struct net_device *dev) 630 { 631 return rcu_dereference(dev->rx_handler) == br_handle_frame; 632 } 633 634 static inline bool br_rx_handler_check_rtnl(const struct net_device *dev) 635 { 636 return rcu_dereference_rtnl(dev->rx_handler) == br_handle_frame; 637 } 638 639 static inline struct net_bridge_port *br_port_get_check_rcu(const struct net_device *dev) 640 { 641 return br_rx_handler_check_rcu(dev) ? br_port_get_rcu(dev) : NULL; 642 } 643 644 static inline struct net_bridge_port * 645 br_port_get_check_rtnl(const struct net_device *dev) 646 { 647 return br_rx_handler_check_rtnl(dev) ? br_port_get_rtnl_rcu(dev) : NULL; 648 } 649 650 /* br_ioctl.c */ 651 int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd); 652 int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd, 653 void __user *arg); 654 655 /* br_multicast.c */ 656 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING 657 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port, 658 struct sk_buff *skb, u16 vid); 659 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br, 660 struct sk_buff *skb, u16 vid); 661 int br_multicast_add_port(struct net_bridge_port *port); 662 void br_multicast_del_port(struct net_bridge_port *port); 663 void br_multicast_enable_port(struct net_bridge_port *port); 664 void br_multicast_disable_port(struct net_bridge_port *port); 665 void br_multicast_init(struct net_bridge *br); 666 void br_multicast_open(struct net_bridge *br); 667 void br_multicast_stop(struct net_bridge *br); 668 void br_multicast_dev_del(struct net_bridge *br); 669 void br_multicast_flood(struct net_bridge_mdb_entry *mdst, 670 struct sk_buff *skb, bool local_rcv, bool local_orig); 671 int br_multicast_set_router(struct net_bridge *br, unsigned long val); 672 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val); 673 int br_multicast_toggle(struct net_bridge *br, unsigned long val); 674 int br_multicast_set_querier(struct net_bridge *br, unsigned long val); 675 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val); 676 int br_multicast_set_igmp_version(struct net_bridge *br, unsigned long val); 677 #if IS_ENABLED(CONFIG_IPV6) 678 int br_multicast_set_mld_version(struct net_bridge *br, unsigned long val); 679 #endif 680 struct net_bridge_mdb_entry * 681 br_mdb_ip_get(struct net_bridge *br, struct br_ip *dst); 682 struct net_bridge_mdb_entry * 683 br_multicast_new_group(struct net_bridge *br, struct br_ip *group); 684 struct net_bridge_port_group * 685 br_multicast_new_port_group(struct net_bridge_port *port, struct br_ip *group, 686 struct net_bridge_port_group __rcu *next, 687 unsigned char flags, const unsigned char *src); 688 int br_mdb_hash_init(struct net_bridge *br); 689 void br_mdb_hash_fini(struct net_bridge *br); 690 void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port, 691 struct br_ip *group, int type, u8 flags); 692 void br_rtr_notify(struct net_device *dev, struct net_bridge_port *port, 693 int type); 694 void br_multicast_count(struct net_bridge *br, const struct net_bridge_port *p, 695 const struct sk_buff *skb, u8 type, u8 dir); 696 int br_multicast_init_stats(struct net_bridge *br); 697 void br_multicast_uninit_stats(struct net_bridge *br); 698 void br_multicast_get_stats(const struct net_bridge *br, 699 const struct net_bridge_port *p, 700 struct br_mcast_stats *dest); 701 void br_mdb_init(void); 702 void br_mdb_uninit(void); 703 704 #define mlock_dereference(X, br) \ 705 rcu_dereference_protected(X, lockdep_is_held(&br->multicast_lock)) 706 707 static inline bool br_multicast_is_router(struct net_bridge *br) 708 { 709 return br->multicast_router == 2 || 710 (br->multicast_router == 1 && 711 timer_pending(&br->multicast_router_timer)); 712 } 713 714 static inline bool 715 __br_multicast_querier_exists(struct net_bridge *br, 716 struct bridge_mcast_other_query *querier, 717 const bool is_ipv6) 718 { 719 bool own_querier_enabled; 720 721 if (br_opt_get(br, BROPT_MULTICAST_QUERIER)) { 722 if (is_ipv6 && !br_opt_get(br, BROPT_HAS_IPV6_ADDR)) 723 own_querier_enabled = false; 724 else 725 own_querier_enabled = true; 726 } else { 727 own_querier_enabled = false; 728 } 729 730 return time_is_before_jiffies(querier->delay_time) && 731 (own_querier_enabled || timer_pending(&querier->timer)); 732 } 733 734 static inline bool br_multicast_querier_exists(struct net_bridge *br, 735 struct ethhdr *eth) 736 { 737 switch (eth->h_proto) { 738 case (htons(ETH_P_IP)): 739 return __br_multicast_querier_exists(br, 740 &br->ip4_other_query, false); 741 #if IS_ENABLED(CONFIG_IPV6) 742 case (htons(ETH_P_IPV6)): 743 return __br_multicast_querier_exists(br, 744 &br->ip6_other_query, true); 745 #endif 746 default: 747 return false; 748 } 749 } 750 751 static inline int br_multicast_igmp_type(const struct sk_buff *skb) 752 { 753 return BR_INPUT_SKB_CB(skb)->igmp; 754 } 755 #else 756 static inline int br_multicast_rcv(struct net_bridge *br, 757 struct net_bridge_port *port, 758 struct sk_buff *skb, 759 u16 vid) 760 { 761 return 0; 762 } 763 764 static inline struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br, 765 struct sk_buff *skb, u16 vid) 766 { 767 return NULL; 768 } 769 770 static inline int br_multicast_add_port(struct net_bridge_port *port) 771 { 772 return 0; 773 } 774 775 static inline void br_multicast_del_port(struct net_bridge_port *port) 776 { 777 } 778 779 static inline void br_multicast_enable_port(struct net_bridge_port *port) 780 { 781 } 782 783 static inline void br_multicast_disable_port(struct net_bridge_port *port) 784 { 785 } 786 787 static inline void br_multicast_init(struct net_bridge *br) 788 { 789 } 790 791 static inline void br_multicast_open(struct net_bridge *br) 792 { 793 } 794 795 static inline void br_multicast_stop(struct net_bridge *br) 796 { 797 } 798 799 static inline void br_multicast_dev_del(struct net_bridge *br) 800 { 801 } 802 803 static inline void br_multicast_flood(struct net_bridge_mdb_entry *mdst, 804 struct sk_buff *skb, 805 bool local_rcv, bool local_orig) 806 { 807 } 808 809 static inline bool br_multicast_is_router(struct net_bridge *br) 810 { 811 return false; 812 } 813 814 static inline bool br_multicast_querier_exists(struct net_bridge *br, 815 struct ethhdr *eth) 816 { 817 return false; 818 } 819 820 static inline void br_mdb_init(void) 821 { 822 } 823 824 static inline void br_mdb_uninit(void) 825 { 826 } 827 828 static inline int br_mdb_hash_init(struct net_bridge *br) 829 { 830 return 0; 831 } 832 833 static inline void br_mdb_hash_fini(struct net_bridge *br) 834 { 835 } 836 837 static inline void br_multicast_count(struct net_bridge *br, 838 const struct net_bridge_port *p, 839 const struct sk_buff *skb, 840 u8 type, u8 dir) 841 { 842 } 843 844 static inline int br_multicast_init_stats(struct net_bridge *br) 845 { 846 return 0; 847 } 848 849 static inline void br_multicast_uninit_stats(struct net_bridge *br) 850 { 851 } 852 853 static inline int br_multicast_igmp_type(const struct sk_buff *skb) 854 { 855 return 0; 856 } 857 #endif 858 859 /* br_vlan.c */ 860 #ifdef CONFIG_BRIDGE_VLAN_FILTERING 861 bool br_allowed_ingress(const struct net_bridge *br, 862 struct net_bridge_vlan_group *vg, struct sk_buff *skb, 863 u16 *vid); 864 bool br_allowed_egress(struct net_bridge_vlan_group *vg, 865 const struct sk_buff *skb); 866 bool br_should_learn(struct net_bridge_port *p, struct sk_buff *skb, u16 *vid); 867 struct sk_buff *br_handle_vlan(struct net_bridge *br, 868 const struct net_bridge_port *port, 869 struct net_bridge_vlan_group *vg, 870 struct sk_buff *skb); 871 int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags, 872 bool *changed, struct netlink_ext_ack *extack); 873 int br_vlan_delete(struct net_bridge *br, u16 vid); 874 void br_vlan_flush(struct net_bridge *br); 875 struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg, u16 vid); 876 void br_recalculate_fwd_mask(struct net_bridge *br); 877 int __br_vlan_filter_toggle(struct net_bridge *br, unsigned long val); 878 int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val); 879 int __br_vlan_set_proto(struct net_bridge *br, __be16 proto); 880 int br_vlan_set_proto(struct net_bridge *br, unsigned long val); 881 int br_vlan_set_stats(struct net_bridge *br, unsigned long val); 882 int br_vlan_set_stats_per_port(struct net_bridge *br, unsigned long val); 883 int br_vlan_init(struct net_bridge *br); 884 int br_vlan_set_default_pvid(struct net_bridge *br, unsigned long val); 885 int __br_vlan_set_default_pvid(struct net_bridge *br, u16 pvid, 886 struct netlink_ext_ack *extack); 887 int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags, 888 bool *changed, struct netlink_ext_ack *extack); 889 int nbp_vlan_delete(struct net_bridge_port *port, u16 vid); 890 void nbp_vlan_flush(struct net_bridge_port *port); 891 int nbp_vlan_init(struct net_bridge_port *port, struct netlink_ext_ack *extack); 892 int nbp_get_num_vlan_infos(struct net_bridge_port *p, u32 filter_mask); 893 void br_vlan_get_stats(const struct net_bridge_vlan *v, 894 struct br_vlan_stats *stats); 895 void br_vlan_port_event(struct net_bridge_port *p, unsigned long event); 896 void br_vlan_bridge_event(struct net_device *dev, unsigned long event, 897 void *ptr); 898 899 static inline struct net_bridge_vlan_group *br_vlan_group( 900 const struct net_bridge *br) 901 { 902 return rtnl_dereference(br->vlgrp); 903 } 904 905 static inline struct net_bridge_vlan_group *nbp_vlan_group( 906 const struct net_bridge_port *p) 907 { 908 return rtnl_dereference(p->vlgrp); 909 } 910 911 static inline struct net_bridge_vlan_group *br_vlan_group_rcu( 912 const struct net_bridge *br) 913 { 914 return rcu_dereference(br->vlgrp); 915 } 916 917 static inline struct net_bridge_vlan_group *nbp_vlan_group_rcu( 918 const struct net_bridge_port *p) 919 { 920 return rcu_dereference(p->vlgrp); 921 } 922 923 /* Since bridge now depends on 8021Q module, but the time bridge sees the 924 * skb, the vlan tag will always be present if the frame was tagged. 925 */ 926 static inline int br_vlan_get_tag(const struct sk_buff *skb, u16 *vid) 927 { 928 int err = 0; 929 930 if (skb_vlan_tag_present(skb)) { 931 *vid = skb_vlan_tag_get_id(skb); 932 } else { 933 *vid = 0; 934 err = -EINVAL; 935 } 936 937 return err; 938 } 939 940 static inline u16 br_get_pvid(const struct net_bridge_vlan_group *vg) 941 { 942 if (!vg) 943 return 0; 944 945 smp_rmb(); 946 return vg->pvid; 947 } 948 949 #else 950 static inline bool br_allowed_ingress(const struct net_bridge *br, 951 struct net_bridge_vlan_group *vg, 952 struct sk_buff *skb, 953 u16 *vid) 954 { 955 return true; 956 } 957 958 static inline bool br_allowed_egress(struct net_bridge_vlan_group *vg, 959 const struct sk_buff *skb) 960 { 961 return true; 962 } 963 964 static inline bool br_should_learn(struct net_bridge_port *p, 965 struct sk_buff *skb, u16 *vid) 966 { 967 return true; 968 } 969 970 static inline struct sk_buff *br_handle_vlan(struct net_bridge *br, 971 const struct net_bridge_port *port, 972 struct net_bridge_vlan_group *vg, 973 struct sk_buff *skb) 974 { 975 return skb; 976 } 977 978 static inline int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags, 979 bool *changed, struct netlink_ext_ack *extack) 980 { 981 *changed = false; 982 return -EOPNOTSUPP; 983 } 984 985 static inline int br_vlan_delete(struct net_bridge *br, u16 vid) 986 { 987 return -EOPNOTSUPP; 988 } 989 990 static inline void br_vlan_flush(struct net_bridge *br) 991 { 992 } 993 994 static inline void br_recalculate_fwd_mask(struct net_bridge *br) 995 { 996 } 997 998 static inline int br_vlan_init(struct net_bridge *br) 999 { 1000 return 0; 1001 } 1002 1003 static inline int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags, 1004 bool *changed, struct netlink_ext_ack *extack) 1005 { 1006 *changed = false; 1007 return -EOPNOTSUPP; 1008 } 1009 1010 static inline int nbp_vlan_delete(struct net_bridge_port *port, u16 vid) 1011 { 1012 return -EOPNOTSUPP; 1013 } 1014 1015 static inline void nbp_vlan_flush(struct net_bridge_port *port) 1016 { 1017 } 1018 1019 static inline struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg, 1020 u16 vid) 1021 { 1022 return NULL; 1023 } 1024 1025 static inline int nbp_vlan_init(struct net_bridge_port *port, 1026 struct netlink_ext_ack *extack) 1027 { 1028 return 0; 1029 } 1030 1031 static inline u16 br_vlan_get_tag(const struct sk_buff *skb, u16 *tag) 1032 { 1033 return 0; 1034 } 1035 1036 static inline u16 br_get_pvid(const struct net_bridge_vlan_group *vg) 1037 { 1038 return 0; 1039 } 1040 1041 static inline int __br_vlan_filter_toggle(struct net_bridge *br, 1042 unsigned long val) 1043 { 1044 return -EOPNOTSUPP; 1045 } 1046 1047 static inline int nbp_get_num_vlan_infos(struct net_bridge_port *p, 1048 u32 filter_mask) 1049 { 1050 return 0; 1051 } 1052 1053 static inline struct net_bridge_vlan_group *br_vlan_group( 1054 const struct net_bridge *br) 1055 { 1056 return NULL; 1057 } 1058 1059 static inline struct net_bridge_vlan_group *nbp_vlan_group( 1060 const struct net_bridge_port *p) 1061 { 1062 return NULL; 1063 } 1064 1065 static inline struct net_bridge_vlan_group *br_vlan_group_rcu( 1066 const struct net_bridge *br) 1067 { 1068 return NULL; 1069 } 1070 1071 static inline struct net_bridge_vlan_group *nbp_vlan_group_rcu( 1072 const struct net_bridge_port *p) 1073 { 1074 return NULL; 1075 } 1076 1077 static inline void br_vlan_get_stats(const struct net_bridge_vlan *v, 1078 struct br_vlan_stats *stats) 1079 { 1080 } 1081 1082 static inline void br_vlan_port_event(struct net_bridge_port *p, 1083 unsigned long event) 1084 { 1085 } 1086 1087 static inline void br_vlan_bridge_event(struct net_device *dev, 1088 unsigned long event, void *ptr) 1089 { 1090 } 1091 #endif 1092 1093 struct nf_br_ops { 1094 int (*br_dev_xmit_hook)(struct sk_buff *skb); 1095 }; 1096 extern const struct nf_br_ops __rcu *nf_br_ops; 1097 1098 /* br_netfilter.c */ 1099 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER) 1100 int br_nf_core_init(void); 1101 void br_nf_core_fini(void); 1102 void br_netfilter_rtable_init(struct net_bridge *); 1103 #else 1104 static inline int br_nf_core_init(void) { return 0; } 1105 static inline void br_nf_core_fini(void) {} 1106 #define br_netfilter_rtable_init(x) 1107 #endif 1108 1109 /* br_stp.c */ 1110 void br_set_state(struct net_bridge_port *p, unsigned int state); 1111 struct net_bridge_port *br_get_port(struct net_bridge *br, u16 port_no); 1112 void br_init_port(struct net_bridge_port *p); 1113 void br_become_designated_port(struct net_bridge_port *p); 1114 1115 void __br_set_forward_delay(struct net_bridge *br, unsigned long t); 1116 int br_set_forward_delay(struct net_bridge *br, unsigned long x); 1117 int br_set_hello_time(struct net_bridge *br, unsigned long x); 1118 int br_set_max_age(struct net_bridge *br, unsigned long x); 1119 int __set_ageing_time(struct net_device *dev, unsigned long t); 1120 int br_set_ageing_time(struct net_bridge *br, clock_t ageing_time); 1121 1122 1123 /* br_stp_if.c */ 1124 void br_stp_enable_bridge(struct net_bridge *br); 1125 void br_stp_disable_bridge(struct net_bridge *br); 1126 void br_stp_set_enabled(struct net_bridge *br, unsigned long val); 1127 void br_stp_enable_port(struct net_bridge_port *p); 1128 void br_stp_disable_port(struct net_bridge_port *p); 1129 bool br_stp_recalculate_bridge_id(struct net_bridge *br); 1130 void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *a); 1131 void br_stp_set_bridge_priority(struct net_bridge *br, u16 newprio); 1132 int br_stp_set_port_priority(struct net_bridge_port *p, unsigned long newprio); 1133 int br_stp_set_path_cost(struct net_bridge_port *p, unsigned long path_cost); 1134 ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id); 1135 1136 /* br_stp_bpdu.c */ 1137 struct stp_proto; 1138 void br_stp_rcv(const struct stp_proto *proto, struct sk_buff *skb, 1139 struct net_device *dev); 1140 1141 /* br_stp_timer.c */ 1142 void br_stp_timer_init(struct net_bridge *br); 1143 void br_stp_port_timer_init(struct net_bridge_port *p); 1144 unsigned long br_timer_value(const struct timer_list *timer); 1145 1146 /* br.c */ 1147 #if IS_ENABLED(CONFIG_ATM_LANE) 1148 extern int (*br_fdb_test_addr_hook)(struct net_device *dev, unsigned char *addr); 1149 #endif 1150 1151 /* br_netlink.c */ 1152 extern struct rtnl_link_ops br_link_ops; 1153 int br_netlink_init(void); 1154 void br_netlink_fini(void); 1155 void br_ifinfo_notify(int event, const struct net_bridge *br, 1156 const struct net_bridge_port *port); 1157 int br_setlink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags, 1158 struct netlink_ext_ack *extack); 1159 int br_dellink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags); 1160 int br_getlink(struct sk_buff *skb, u32 pid, u32 seq, struct net_device *dev, 1161 u32 filter_mask, int nlflags); 1162 1163 #ifdef CONFIG_SYSFS 1164 /* br_sysfs_if.c */ 1165 extern const struct sysfs_ops brport_sysfs_ops; 1166 int br_sysfs_addif(struct net_bridge_port *p); 1167 int br_sysfs_renameif(struct net_bridge_port *p); 1168 1169 /* br_sysfs_br.c */ 1170 int br_sysfs_addbr(struct net_device *dev); 1171 void br_sysfs_delbr(struct net_device *dev); 1172 1173 #else 1174 1175 static inline int br_sysfs_addif(struct net_bridge_port *p) { return 0; } 1176 static inline int br_sysfs_renameif(struct net_bridge_port *p) { return 0; } 1177 static inline int br_sysfs_addbr(struct net_device *dev) { return 0; } 1178 static inline void br_sysfs_delbr(struct net_device *dev) { return; } 1179 #endif /* CONFIG_SYSFS */ 1180 1181 /* br_switchdev.c */ 1182 #ifdef CONFIG_NET_SWITCHDEV 1183 int nbp_switchdev_mark_set(struct net_bridge_port *p); 1184 void nbp_switchdev_frame_mark(const struct net_bridge_port *p, 1185 struct sk_buff *skb); 1186 bool nbp_switchdev_allowed_egress(const struct net_bridge_port *p, 1187 const struct sk_buff *skb); 1188 int br_switchdev_set_port_flag(struct net_bridge_port *p, 1189 unsigned long flags, 1190 unsigned long mask); 1191 void br_switchdev_fdb_notify(const struct net_bridge_fdb_entry *fdb, 1192 int type); 1193 int br_switchdev_port_vlan_add(struct net_device *dev, u16 vid, u16 flags, 1194 struct netlink_ext_ack *extack); 1195 int br_switchdev_port_vlan_del(struct net_device *dev, u16 vid); 1196 1197 static inline void br_switchdev_frame_unmark(struct sk_buff *skb) 1198 { 1199 skb->offload_fwd_mark = 0; 1200 } 1201 #else 1202 static inline int nbp_switchdev_mark_set(struct net_bridge_port *p) 1203 { 1204 return 0; 1205 } 1206 1207 static inline void nbp_switchdev_frame_mark(const struct net_bridge_port *p, 1208 struct sk_buff *skb) 1209 { 1210 } 1211 1212 static inline bool nbp_switchdev_allowed_egress(const struct net_bridge_port *p, 1213 const struct sk_buff *skb) 1214 { 1215 return true; 1216 } 1217 1218 static inline int br_switchdev_set_port_flag(struct net_bridge_port *p, 1219 unsigned long flags, 1220 unsigned long mask) 1221 { 1222 return 0; 1223 } 1224 1225 static inline int br_switchdev_port_vlan_add(struct net_device *dev, 1226 u16 vid, u16 flags, 1227 struct netlink_ext_ack *extack) 1228 { 1229 return -EOPNOTSUPP; 1230 } 1231 1232 static inline int br_switchdev_port_vlan_del(struct net_device *dev, u16 vid) 1233 { 1234 return -EOPNOTSUPP; 1235 } 1236 1237 static inline void 1238 br_switchdev_fdb_notify(const struct net_bridge_fdb_entry *fdb, int type) 1239 { 1240 } 1241 1242 static inline void br_switchdev_frame_unmark(struct sk_buff *skb) 1243 { 1244 } 1245 #endif /* CONFIG_NET_SWITCHDEV */ 1246 1247 /* br_arp_nd_proxy.c */ 1248 void br_recalculate_neigh_suppress_enabled(struct net_bridge *br); 1249 void br_do_proxy_suppress_arp(struct sk_buff *skb, struct net_bridge *br, 1250 u16 vid, struct net_bridge_port *p); 1251 void br_do_suppress_nd(struct sk_buff *skb, struct net_bridge *br, 1252 u16 vid, struct net_bridge_port *p, struct nd_msg *msg); 1253 struct nd_msg *br_is_nd_neigh_msg(struct sk_buff *skb, struct nd_msg *m); 1254 #endif 1255