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