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