net/bridge/br_private.h

   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
  25 #define BR_HASH_BITS 8
  26 #define BR_HASH_SIZE (1 << BR_HASH_BITS)
  27
  28 #define BR_HOLD_TIME (1*HZ)
  29
  30 #define BR_PORT_BITS    10
  31 #define BR_MAX_PORTS    (1<<BR_PORT_BITS)
  32
  33 #define BR_VERSION      "2.3"
  34
  35 /* Control of forwarding link local multicast */
  36 #define BR_GROUPFWD_DEFAULT     0
  37 /* Don't allow forwarding of control protocols like STP, MAC PAUSE and LACP */
  38 #define BR_GROUPFWD_RESTRICTED  0x0007u
  39 /* The Nearest Customer Bridge Group Address, 01-80-C2-00-00-[00,0B,0C,0D,0F] */
  40 #define BR_GROUPFWD_8021AD      0xB801u
  41
  42 /* Path to usermode spanning tree program */
  43 #define BR_STP_PROG     "/sbin/bridge-stp"
  44
  45 typedef struct bridge_id bridge_id;
  46 typedef struct mac_addr mac_addr;
  47 typedef __u16 port_id;
  48
  49 struct bridge_id
  50 {
  51         unsigned char   prio[2];
  52         unsigned char   addr[ETH_ALEN];
  53 };
  54
  55 struct mac_addr
  56 {
  57         unsigned char   addr[ETH_ALEN];
  58 };
  59
  60 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
  61 /* our own querier */
  62 struct bridge_mcast_own_query {
  63         struct timer_list       timer;
  64         u32                     startup_sent;
  65 };
  66
  67 /* other querier */
  68 struct bridge_mcast_other_query {
  69         struct timer_list               timer;
  70         unsigned long                   delay_time;
  71 };
  72
  73 /* selected querier */
  74 struct bridge_mcast_querier {
  75         struct br_ip addr;
  76         struct net_bridge_port __rcu    *port;
  77 };
  78
  79 /* IGMP/MLD statistics */
  80 struct bridge_mcast_stats {
  81         struct br_mcast_stats mstats;
  82         struct u64_stats_sync syncp;
  83 };
  84 #endif
  85
  86 struct br_vlan_stats {
  87         u64 rx_bytes;
  88         u64 rx_packets;
  89         u64 tx_bytes;
  90         u64 tx_packets;
  91         struct u64_stats_sync syncp;
  92 };
  93
  94 struct br_tunnel_info {
  95         __be64                  tunnel_id;
  96         struct metadata_dst     *tunnel_dst;
  97 };
  98
  99 /**
 100  * struct net_bridge_vlan - per-vlan entry
 101  *
 102  * @vnode: rhashtable member
 103  * @vid: VLAN id
 104  * @flags: bridge vlan flags
 105  * @stats: per-cpu VLAN statistics
 106  * @br: if MASTER flag set, this points to a bridge struct
 107  * @port: if MASTER flag unset, this points to a port struct
 108  * @refcnt: if MASTER flag set, this is bumped for each port referencing it
 109  * @brvlan: if MASTER flag unset, this points to the global per-VLAN context
 110  *          for this VLAN entry
 111  * @vlist: sorted list of VLAN entries
 112  * @rcu: used for entry destruction
 113  *
 114  * This structure is shared between the global per-VLAN entries contained in
 115  * the bridge rhashtable and the local per-port per-VLAN entries contained in
 116  * the port's rhashtable. The union entries should be interpreted depending on
 117  * the entry flags that are set.
 118  */
 119 struct net_bridge_vlan {
 120         struct rhash_head               vnode;
 121         struct rhash_head               tnode;
 122         u16                             vid;
 123         u16                             flags;
 124         struct br_vlan_stats __percpu   *stats;
 125         union {
 126                 struct net_bridge       *br;
 127                 struct net_bridge_port  *port;
 128         };
 129         union {
 130                 atomic_t                refcnt;
 131                 struct net_bridge_vlan  *brvlan;
 132         };
 133
 134         struct br_tunnel_info           tinfo;
 135
 136         struct list_head                vlist;
 137
 138         struct rcu_head                 rcu;
 139 };
 140
 141 /**
 142  * struct net_bridge_vlan_group
 143  *
 144  * @vlan_hash: VLAN entry rhashtable
 145  * @vlan_list: sorted VLAN entry list
 146  * @num_vlans: number of total VLAN entries
 147  * @pvid: PVID VLAN id
 148  *
 149  * IMPORTANT: Be careful when checking if there're VLAN entries using list
 150  *            primitives because the bridge can have entries in its list which
 151  *            are just for global context but not for filtering, i.e. they have
 152  *            the master flag set but not the brentry flag. If you have to check
 153  *            if there're "real" entries in the bridge please test @num_vlans
 154  */
 155 struct net_bridge_vlan_group {
 156         struct rhashtable               vlan_hash;
 157         struct rhashtable               tunnel_hash;
 158         struct list_head                vlan_list;
 159         u16                             num_vlans;
 160         u16                             pvid;
 161 };
 162
 163 struct net_bridge_fdb_entry {
 164         struct hlist_node               hlist;
 165         struct net_bridge_port          *dst;
 166
 167         mac_addr                        addr;
 168         __u16                           vlan_id;
 169         unsigned char                   is_local:1,
 170                                         is_static:1,
 171                                         added_by_user:1,
 172                                         added_by_external_learn:1,
 173                                         offloaded:1;
 174
 175         /* write-heavy members should not affect lookups */
 176         unsigned long                   updated ____cacheline_aligned_in_smp;
 177         unsigned long                   used;
 178
 179         struct rcu_head                 rcu;
 180 };
 181
 182 #define MDB_PG_FLAGS_PERMANENT  BIT(0)
 183 #define MDB_PG_FLAGS_OFFLOAD    BIT(1)
 184
 185 struct net_bridge_port_group {
 186         struct net_bridge_port          *port;
 187         struct net_bridge_port_group __rcu *next;
 188         struct hlist_node               mglist;
 189         struct rcu_head                 rcu;
 190         struct timer_list               timer;
 191         struct br_ip                    addr;
 192         unsigned char                   flags;
 193         unsigned char                   eth_addr[ETH_ALEN];
 194 };
 195
 196 struct net_bridge_mdb_entry
 197 {
 198         struct hlist_node               hlist[2];
 199         struct net_bridge               *br;
 200         struct net_bridge_port_group __rcu *ports;
 201         struct rcu_head                 rcu;
 202         struct timer_list               timer;
 203         struct br_ip                    addr;
 204         bool                            mglist;
 205 };
 206
 207 struct net_bridge_mdb_htable
 208 {
 209         struct hlist_head               *mhash;
 210         struct rcu_head                 rcu;
 211         struct net_bridge_mdb_htable    *old;
 212         u32                             size;
 213         u32                             max;
 214         u32                             secret;
 215         u32                             ver;
 216 };
 217
 218 struct net_bridge_port {
 219         struct net_bridge               *br;
 220         struct net_device               *dev;
 221         struct list_head                list;
 222
 223         unsigned long                   flags;
 224 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 225         struct net_bridge_vlan_group    __rcu *vlgrp;
 226 #endif
 227
 228         /* STP */
 229         u8                              priority;
 230         u8                              state;
 231         u16                             port_no;
 232         unsigned char                   topology_change_ack;
 233         unsigned char                   config_pending;
 234         port_id                         port_id;
 235         port_id                         designated_port;
 236         bridge_id                       designated_root;
 237         bridge_id                       designated_bridge;
 238         u32                             path_cost;
 239         u32                             designated_cost;
 240         unsigned long                   designated_age;
 241
 242         struct timer_list               forward_delay_timer;
 243         struct timer_list               hold_timer;
 244         struct timer_list               message_age_timer;
 245         struct kobject                  kobj;
 246         struct rcu_head                 rcu;
 247
 248 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 249         struct bridge_mcast_own_query   ip4_own_query;
 250 #if IS_ENABLED(CONFIG_IPV6)
 251         struct bridge_mcast_own_query   ip6_own_query;
 252 #endif /* IS_ENABLED(CONFIG_IPV6) */
 253         unsigned char                   multicast_router;
 254         struct bridge_mcast_stats       __percpu *mcast_stats;
 255         struct timer_list               multicast_router_timer;
 256         struct hlist_head               mglist;
 257         struct hlist_node               rlist;
 258 #endif
 259
 260 #ifdef CONFIG_SYSFS
 261         char                            sysfs_name[IFNAMSIZ];
 262 #endif
 263
 264 #ifdef CONFIG_NET_POLL_CONTROLLER
 265         struct netpoll                  *np;
 266 #endif
 267 #ifdef CONFIG_NET_SWITCHDEV
 268         int                             offload_fwd_mark;
 269 #endif
 270 };
 271
 272 #define br_auto_port(p) ((p)->flags & BR_AUTO_MASK)
 273 #define br_promisc_port(p) ((p)->flags & BR_PROMISC)
 274
 275 #define br_port_exists(dev) (dev->priv_flags & IFF_BRIDGE_PORT)
 276
 277 static inline struct net_bridge_port *br_port_get_rcu(const struct net_device *dev)
 278 {
 279         return rcu_dereference(dev->rx_handler_data);
 280 }
 281
 282 static inline struct net_bridge_port *br_port_get_rtnl(const struct net_device *dev)
 283 {
 284         return br_port_exists(dev) ?
 285                 rtnl_dereference(dev->rx_handler_data) : NULL;
 286 }
 287
 288 static inline struct net_bridge_port *br_port_get_rtnl_rcu(const struct net_device *dev)
 289 {
 290         return br_port_exists(dev) ?
 291                 rcu_dereference_rtnl(dev->rx_handler_data) : NULL;
 292 }
 293
 294 struct net_bridge {
 295         spinlock_t                      lock;
 296         spinlock_t                      hash_lock;
 297         struct list_head                port_list;
 298         struct net_device               *dev;
 299         struct pcpu_sw_netstats         __percpu *stats;
 300         /* These fields are accessed on each packet */
 301 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 302         u8                              vlan_enabled;
 303         u8                              vlan_stats_enabled;
 304         __be16                          vlan_proto;
 305         u16                             default_pvid;
 306         struct net_bridge_vlan_group    __rcu *vlgrp;
 307 #endif
 308
 309         struct hlist_head               hash[BR_HASH_SIZE];
 310 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
 311         union {
 312                 struct rtable           fake_rtable;
 313                 struct rt6_info         fake_rt6_info;
 314         };
 315         bool                            nf_call_iptables;
 316         bool                            nf_call_ip6tables;
 317         bool                            nf_call_arptables;
 318 #endif
 319         u16                             group_fwd_mask;
 320         u16                             group_fwd_mask_required;
 321
 322         /* STP */
 323         bridge_id                       designated_root;
 324         bridge_id                       bridge_id;
 325         u32                             root_path_cost;
 326         unsigned char                   topology_change;
 327         unsigned char                   topology_change_detected;
 328         u16                             root_port;
 329         unsigned long                   max_age;
 330         unsigned long                   hello_time;
 331         unsigned long                   forward_delay;
 332         unsigned long                   ageing_time;
 333         unsigned long                   bridge_max_age;
 334         unsigned long                   bridge_hello_time;
 335         unsigned long                   bridge_forward_delay;
 336         unsigned long                   bridge_ageing_time;
 337
 338         u8                              group_addr[ETH_ALEN];
 339         bool                            group_addr_set;
 340
 341         enum {
 342                 BR_NO_STP,              /* no spanning tree */
 343                 BR_KERNEL_STP,          /* old STP in kernel */
 344                 BR_USER_STP,            /* new RSTP in userspace */
 345         } stp_enabled;
 346
 347 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 348         unsigned char                   multicast_router;
 349
 350         u8                              multicast_disabled:1;
 351         u8                              multicast_querier:1;
 352         u8                              multicast_query_use_ifaddr:1;
 353         u8                              has_ipv6_addr:1;
 354         u8                              multicast_stats_enabled:1;
 355
 356         u32                             hash_elasticity;
 357         u32                             hash_max;
 358
 359         u32                             multicast_last_member_count;
 360         u32                             multicast_startup_query_count;
 361
 362         u8                              multicast_igmp_version;
 363
 364         unsigned long                   multicast_last_member_interval;
 365         unsigned long                   multicast_membership_interval;
 366         unsigned long                   multicast_querier_interval;
 367         unsigned long                   multicast_query_interval;
 368         unsigned long                   multicast_query_response_interval;
 369         unsigned long                   multicast_startup_query_interval;
 370
 371         spinlock_t                      multicast_lock;
 372         struct net_bridge_mdb_htable __rcu *mdb;
 373         struct hlist_head               router_list;
 374
 375         struct timer_list               multicast_router_timer;
 376         struct bridge_mcast_other_query ip4_other_query;
 377         struct bridge_mcast_own_query   ip4_own_query;
 378         struct bridge_mcast_querier     ip4_querier;
 379         struct bridge_mcast_stats       __percpu *mcast_stats;
 380 #if IS_ENABLED(CONFIG_IPV6)
 381         struct bridge_mcast_other_query ip6_other_query;
 382         struct bridge_mcast_own_query   ip6_own_query;
 383         struct bridge_mcast_querier     ip6_querier;
 384         u8                              multicast_mld_version;
 385 #endif /* IS_ENABLED(CONFIG_IPV6) */
 386 #endif
 387
 388         struct timer_list               hello_timer;
 389         struct timer_list               tcn_timer;
 390         struct timer_list               topology_change_timer;
 391         struct delayed_work             gc_work;
 392         struct kobject                  *ifobj;
 393         u32                             auto_cnt;
 394
 395 #ifdef CONFIG_NET_SWITCHDEV
 396         int offload_fwd_mark;
 397 #endif
 398 };
 399
 400 struct br_input_skb_cb {
 401         struct net_device *brdev;
 402
 403 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 404         int igmp;
 405         int mrouters_only;
 406 #endif
 407
 408         bool proxyarp_replied;
 409
 410 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 411         bool vlan_filtered;
 412 #endif
 413
 414 #ifdef CONFIG_NET_SWITCHDEV
 415         int offload_fwd_mark;
 416 #endif
 417 };
 418
 419 #define BR_INPUT_SKB_CB(__skb)  ((struct br_input_skb_cb *)(__skb)->cb)
 420
 421 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 422 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb)   (BR_INPUT_SKB_CB(__skb)->mrouters_only)
 423 #else
 424 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb)   (0)
 425 #endif
 426
 427 #define br_printk(level, br, format, args...)   \
 428         printk(level "%s: " format, (br)->dev->name, ##args)
 429
 430 #define br_err(__br, format, args...)                   \
 431         br_printk(KERN_ERR, __br, format, ##args)
 432 #define br_warn(__br, format, args...)                  \
 433         br_printk(KERN_WARNING, __br, format, ##args)
 434 #define br_notice(__br, format, args...)                \
 435         br_printk(KERN_NOTICE, __br, format, ##args)
 436 #define br_info(__br, format, args...)                  \
 437         br_printk(KERN_INFO, __br, format, ##args)
 438
 439 #define br_debug(br, format, args...)                   \
 440         pr_debug("%s: " format,  (br)->dev->name, ##args)
 441
 442 /* called under bridge lock */
 443 static inline int br_is_root_bridge(const struct net_bridge *br)
 444 {
 445         return !memcmp(&br->bridge_id, &br->designated_root, 8);
 446 }
 447
 448 /* check if a VLAN entry is global */
 449 static inline bool br_vlan_is_master(const struct net_bridge_vlan *v)
 450 {
 451         return v->flags & BRIDGE_VLAN_INFO_MASTER;
 452 }
 453
 454 /* check if a VLAN entry is used by the bridge */
 455 static inline bool br_vlan_is_brentry(const struct net_bridge_vlan *v)
 456 {
 457         return v->flags & BRIDGE_VLAN_INFO_BRENTRY;
 458 }
 459
 460 /* check if we should use the vlan entry, returns false if it's only context */
 461 static inline bool br_vlan_should_use(const struct net_bridge_vlan *v)
 462 {
 463         if (br_vlan_is_master(v)) {
 464                 if (br_vlan_is_brentry(v))
 465                         return true;
 466                 else
 467                         return false;
 468         }
 469
 470         return true;
 471 }
 472
 473 /* br_device.c */
 474 void br_dev_setup(struct net_device *dev);
 475 void br_dev_delete(struct net_device *dev, struct list_head *list);
 476 netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev);
 477 #ifdef CONFIG_NET_POLL_CONTROLLER
 478 static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
 479                                        struct sk_buff *skb)
 480 {
 481         struct netpoll *np = p->np;
 482
 483         if (np)
 484                 netpoll_send_skb(np, skb);
 485 }
 486
 487 int br_netpoll_enable(struct net_bridge_port *p);
 488 void br_netpoll_disable(struct net_bridge_port *p);
 489 #else
 490 static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
 491                                        struct sk_buff *skb)
 492 {
 493 }
 494
 495 static inline int br_netpoll_enable(struct net_bridge_port *p)
 496 {
 497         return 0;
 498 }
 499
 500 static inline void br_netpoll_disable(struct net_bridge_port *p)
 501 {
 502 }
 503 #endif
 504
 505 /* br_fdb.c */
 506 int br_fdb_init(void);
 507 void br_fdb_fini(void);
 508 void br_fdb_flush(struct net_bridge *br);
 509 void br_fdb_find_delete_local(struct net_bridge *br,
 510                               const struct net_bridge_port *p,
 511                               const unsigned char *addr, u16 vid);
 512 void br_fdb_changeaddr(struct net_bridge_port *p, const unsigned char *newaddr);
 513 void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr);
 514 void br_fdb_cleanup(struct work_struct *work);
 515 void br_fdb_delete_by_port(struct net_bridge *br,
 516                            const struct net_bridge_port *p, u16 vid, int do_all);
 517 struct net_bridge_fdb_entry *br_fdb_find_rcu(struct net_bridge *br,
 518                                              const unsigned char *addr,
 519                                              __u16 vid);
 520 int br_fdb_test_addr(struct net_device *dev, unsigned char *addr);
 521 int br_fdb_fillbuf(struct net_bridge *br, void *buf, unsigned long count,
 522                    unsigned long off);
 523 int br_fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
 524                   const unsigned char *addr, u16 vid);
 525 void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source,
 526                    const unsigned char *addr, u16 vid, bool added_by_user);
 527
 528 int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
 529                   struct net_device *dev, const unsigned char *addr, u16 vid);
 530 int br_fdb_add(struct ndmsg *nlh, struct nlattr *tb[], struct net_device *dev,
 531                const unsigned char *addr, u16 vid, u16 nlh_flags);
 532 int br_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
 533                 struct net_device *dev, struct net_device *fdev, int *idx);
 534 int br_fdb_sync_static(struct net_bridge *br, struct net_bridge_port *p);
 535 void br_fdb_unsync_static(struct net_bridge *br, struct net_bridge_port *p);
 536 int br_fdb_external_learn_add(struct net_bridge *br, struct net_bridge_port *p,
 537                               const unsigned char *addr, u16 vid);
 538 int br_fdb_external_learn_del(struct net_bridge *br, struct net_bridge_port *p,
 539                               const unsigned char *addr, u16 vid);
 540 void br_fdb_offloaded_set(struct net_bridge *br, struct net_bridge_port *p,
 541                           const unsigned char *addr, u16 vid);
 542
 543 /* br_forward.c */
 544 enum br_pkt_type {
 545         BR_PKT_UNICAST,
 546         BR_PKT_MULTICAST,
 547         BR_PKT_BROADCAST
 548 };
 549 int br_dev_queue_push_xmit(struct net *net, struct sock *sk, struct sk_buff *skb);
 550 void br_forward(const struct net_bridge_port *to, struct sk_buff *skb,
 551                 bool local_rcv, bool local_orig);
 552 int br_forward_finish(struct net *net, struct sock *sk, struct sk_buff *skb);
 553 void br_flood(struct net_bridge *br, struct sk_buff *skb,
 554               enum br_pkt_type pkt_type, bool local_rcv, bool local_orig);
 555
 556 /* br_if.c */
 557 void br_port_carrier_check(struct net_bridge_port *p);
 558 int br_add_bridge(struct net *net, const char *name);
 559 int br_del_bridge(struct net *net, const char *name);
 560 int br_add_if(struct net_bridge *br, struct net_device *dev);
 561 int br_del_if(struct net_bridge *br, struct net_device *dev);
 562 int br_min_mtu(const struct net_bridge *br);
 563 netdev_features_t br_features_recompute(struct net_bridge *br,
 564                                         netdev_features_t features);
 565 void br_port_flags_change(struct net_bridge_port *port, unsigned long mask);
 566 void br_manage_promisc(struct net_bridge *br);
 567
 568 /* br_input.c */
 569 int br_handle_frame_finish(struct net *net, struct sock *sk, struct sk_buff *skb);
 570 rx_handler_result_t br_handle_frame(struct sk_buff **pskb);
 571
 572 static inline bool br_rx_handler_check_rcu(const struct net_device *dev)
 573 {
 574         return rcu_dereference(dev->rx_handler) == br_handle_frame;
 575 }
 576
 577 static inline struct net_bridge_port *br_port_get_check_rcu(const struct net_device *dev)
 578 {
 579         return br_rx_handler_check_rcu(dev) ? br_port_get_rcu(dev) : NULL;
 580 }
 581
 582 /* br_ioctl.c */
 583 int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
 584 int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd,
 585                              void __user *arg);
 586
 587 /* br_multicast.c */
 588 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 589 extern unsigned int br_mdb_rehash_seq;
 590 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
 591                      struct sk_buff *skb, u16 vid);
 592 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
 593                                         struct sk_buff *skb, u16 vid);
 594 int br_multicast_add_port(struct net_bridge_port *port);
 595 void br_multicast_del_port(struct net_bridge_port *port);
 596 void br_multicast_enable_port(struct net_bridge_port *port);
 597 void br_multicast_disable_port(struct net_bridge_port *port);
 598 void br_multicast_init(struct net_bridge *br);
 599 void br_multicast_open(struct net_bridge *br);
 600 void br_multicast_stop(struct net_bridge *br);
 601 void br_multicast_dev_del(struct net_bridge *br);
 602 void br_multicast_flood(struct net_bridge_mdb_entry *mdst,
 603                         struct sk_buff *skb, bool local_rcv, bool local_orig);
 604 int br_multicast_set_router(struct net_bridge *br, unsigned long val);
 605 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val);
 606 int br_multicast_toggle(struct net_bridge *br, unsigned long val);
 607 int br_multicast_set_querier(struct net_bridge *br, unsigned long val);
 608 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val);
 609 int br_multicast_set_igmp_version(struct net_bridge *br, unsigned long val);
 610 #if IS_ENABLED(CONFIG_IPV6)
 611 int br_multicast_set_mld_version(struct net_bridge *br, unsigned long val);
 612 #endif
 613 struct net_bridge_mdb_entry *
 614 br_mdb_ip_get(struct net_bridge_mdb_htable *mdb, struct br_ip *dst);
 615 struct net_bridge_mdb_entry *
 616 br_multicast_new_group(struct net_bridge *br, struct net_bridge_port *port,
 617                        struct br_ip *group);
 618 void br_multicast_free_pg(struct rcu_head *head);
 619 struct net_bridge_port_group *
 620 br_multicast_new_port_group(struct net_bridge_port *port, struct br_ip *group,
 621                             struct net_bridge_port_group __rcu *next,
 622                             unsigned char flags, const unsigned char *src);
 623 void br_mdb_init(void);
 624 void br_mdb_uninit(void);
 625 void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port,
 626                    struct br_ip *group, int type, u8 flags);
 627 void br_rtr_notify(struct net_device *dev, struct net_bridge_port *port,
 628                    int type);
 629 void br_multicast_count(struct net_bridge *br, const struct net_bridge_port *p,
 630                         const struct sk_buff *skb, u8 type, u8 dir);
 631 int br_multicast_init_stats(struct net_bridge *br);
 632 void br_multicast_uninit_stats(struct net_bridge *br);
 633 void br_multicast_get_stats(const struct net_bridge *br,
 634                             const struct net_bridge_port *p,
 635                             struct br_mcast_stats *dest);
 636
 637 #define mlock_dereference(X, br) \
 638         rcu_dereference_protected(X, lockdep_is_held(&br->multicast_lock))
 639
 640 static inline bool br_multicast_is_router(struct net_bridge *br)
 641 {
 642         return br->multicast_router == 2 ||
 643                (br->multicast_router == 1 &&
 644                 timer_pending(&br->multicast_router_timer));
 645 }
 646
 647 static inline bool
 648 __br_multicast_querier_exists(struct net_bridge *br,
 649                                 struct bridge_mcast_other_query *querier,
 650                                 const bool is_ipv6)
 651 {
 652         bool own_querier_enabled;
 653
 654         if (br->multicast_querier) {
 655                 if (is_ipv6 && !br->has_ipv6_addr)
 656                         own_querier_enabled = false;
 657                 else
 658                         own_querier_enabled = true;
 659         } else {
 660                 own_querier_enabled = false;
 661         }
 662
 663         return time_is_before_jiffies(querier->delay_time) &&
 664                (own_querier_enabled || timer_pending(&querier->timer));
 665 }
 666
 667 static inline bool br_multicast_querier_exists(struct net_bridge *br,
 668                                                struct ethhdr *eth)
 669 {
 670         switch (eth->h_proto) {
 671         case (htons(ETH_P_IP)):
 672                 return __br_multicast_querier_exists(br,
 673                         &br->ip4_other_query, false);
 674 #if IS_ENABLED(CONFIG_IPV6)
 675         case (htons(ETH_P_IPV6)):
 676                 return __br_multicast_querier_exists(br,
 677                         &br->ip6_other_query, true);
 678 #endif
 679         default:
 680                 return false;
 681         }
 682 }
 683
 684 static inline int br_multicast_igmp_type(const struct sk_buff *skb)
 685 {
 686         return BR_INPUT_SKB_CB(skb)->igmp;
 687 }
 688 #else
 689 static inline int br_multicast_rcv(struct net_bridge *br,
 690                                    struct net_bridge_port *port,
 691                                    struct sk_buff *skb,
 692                                    u16 vid)
 693 {
 694         return 0;
 695 }
 696
 697 static inline struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
 698                                                       struct sk_buff *skb, u16 vid)
 699 {
 700         return NULL;
 701 }
 702
 703 static inline int br_multicast_add_port(struct net_bridge_port *port)
 704 {
 705         return 0;
 706 }
 707
 708 static inline void br_multicast_del_port(struct net_bridge_port *port)
 709 {
 710 }
 711
 712 static inline void br_multicast_enable_port(struct net_bridge_port *port)
 713 {
 714 }
 715
 716 static inline void br_multicast_disable_port(struct net_bridge_port *port)
 717 {
 718 }
 719
 720 static inline void br_multicast_init(struct net_bridge *br)
 721 {
 722 }
 723
 724 static inline void br_multicast_open(struct net_bridge *br)
 725 {
 726 }
 727
 728 static inline void br_multicast_stop(struct net_bridge *br)
 729 {
 730 }
 731
 732 static inline void br_multicast_dev_del(struct net_bridge *br)
 733 {
 734 }
 735
 736 static inline void br_multicast_flood(struct net_bridge_mdb_entry *mdst,
 737                                       struct sk_buff *skb,
 738                                       bool local_rcv, bool local_orig)
 739 {
 740 }
 741
 742 static inline bool br_multicast_is_router(struct net_bridge *br)
 743 {
 744         return 0;
 745 }
 746
 747 static inline bool br_multicast_querier_exists(struct net_bridge *br,
 748                                                struct ethhdr *eth)
 749 {
 750         return false;
 751 }
 752
 753 static inline void br_mdb_init(void)
 754 {
 755 }
 756
 757 static inline void br_mdb_uninit(void)
 758 {
 759 }
 760
 761 static inline void br_multicast_count(struct net_bridge *br,
 762                                       const struct net_bridge_port *p,
 763                                       const struct sk_buff *skb,
 764                                       u8 type, u8 dir)
 765 {
 766 }
 767
 768 static inline int br_multicast_init_stats(struct net_bridge *br)
 769 {
 770         return 0;
 771 }
 772
 773 static inline void br_multicast_uninit_stats(struct net_bridge *br)
 774 {
 775 }
 776
 777 static inline int br_multicast_igmp_type(const struct sk_buff *skb)
 778 {
 779         return 0;
 780 }
 781 #endif
 782
 783 /* br_vlan.c */
 784 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
 785 bool br_allowed_ingress(const struct net_bridge *br,
 786                         struct net_bridge_vlan_group *vg, struct sk_buff *skb,
 787                         u16 *vid);
 788 bool br_allowed_egress(struct net_bridge_vlan_group *vg,
 789                        const struct sk_buff *skb);
 790 bool br_should_learn(struct net_bridge_port *p, struct sk_buff *skb, u16 *vid);
 791 struct sk_buff *br_handle_vlan(struct net_bridge *br,
 792                                const struct net_bridge_port *port,
 793                                struct net_bridge_vlan_group *vg,
 794                                struct sk_buff *skb);
 795 int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags);
 796 int br_vlan_delete(struct net_bridge *br, u16 vid);
 797 void br_vlan_flush(struct net_bridge *br);
 798 struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg, u16 vid);
 799 void br_recalculate_fwd_mask(struct net_bridge *br);
 800 int __br_vlan_filter_toggle(struct net_bridge *br, unsigned long val);
 801 int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val);
 802 int __br_vlan_set_proto(struct net_bridge *br, __be16 proto);
 803 int br_vlan_set_proto(struct net_bridge *br, unsigned long val);
 804 int br_vlan_set_stats(struct net_bridge *br, unsigned long val);
 805 int br_vlan_init(struct net_bridge *br);
 806 int br_vlan_set_default_pvid(struct net_bridge *br, unsigned long val);
 807 int __br_vlan_set_default_pvid(struct net_bridge *br, u16 pvid);
 808 int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags);
 809 int nbp_vlan_delete(struct net_bridge_port *port, u16 vid);
 810 void nbp_vlan_flush(struct net_bridge_port *port);
 811 int nbp_vlan_init(struct net_bridge_port *port);
 812 int nbp_get_num_vlan_infos(struct net_bridge_port *p, u32 filter_mask);
 813 void br_vlan_get_stats(const struct net_bridge_vlan *v,
 814                        struct br_vlan_stats *stats);
 815
 816 static inline struct net_bridge_vlan_group *br_vlan_group(
 817                                         const struct net_bridge *br)
 818 {
 819         return rtnl_dereference(br->vlgrp);
 820 }
 821
 822 static inline struct net_bridge_vlan_group *nbp_vlan_group(
 823                                         const struct net_bridge_port *p)
 824 {
 825         return rtnl_dereference(p->vlgrp);
 826 }
 827
 828 static inline struct net_bridge_vlan_group *br_vlan_group_rcu(
 829                                         const struct net_bridge *br)
 830 {
 831         return rcu_dereference(br->vlgrp);
 832 }
 833
 834 static inline struct net_bridge_vlan_group *nbp_vlan_group_rcu(
 835                                         const struct net_bridge_port *p)
 836 {
 837         return rcu_dereference(p->vlgrp);
 838 }
 839
 840 /* Since bridge now depends on 8021Q module, but the time bridge sees the
 841  * skb, the vlan tag will always be present if the frame was tagged.
 842  */
 843 static inline int br_vlan_get_tag(const struct sk_buff *skb, u16 *vid)
 844 {
 845         int err = 0;
 846
 847         if (skb_vlan_tag_present(skb)) {
 848                 *vid = skb_vlan_tag_get(skb) & VLAN_VID_MASK;
 849         } else {
 850                 *vid = 0;
 851                 err = -EINVAL;
 852         }
 853
 854         return err;
 855 }
 856
 857 static inline u16 br_get_pvid(const struct net_bridge_vlan_group *vg)
 858 {
 859         if (!vg)
 860                 return 0;
 861
 862         smp_rmb();
 863         return vg->pvid;
 864 }
 865
 866 #else
 867 static inline bool br_allowed_ingress(const struct net_bridge *br,
 868                                       struct net_bridge_vlan_group *vg,
 869                                       struct sk_buff *skb,
 870                                       u16 *vid)
 871 {
 872         return true;
 873 }
 874
 875 static inline bool br_allowed_egress(struct net_bridge_vlan_group *vg,
 876                                      const struct sk_buff *skb)
 877 {
 878         return true;
 879 }
 880
 881 static inline bool br_should_learn(struct net_bridge_port *p,
 882                                    struct sk_buff *skb, u16 *vid)
 883 {
 884         return true;
 885 }
 886
 887 static inline struct sk_buff *br_handle_vlan(struct net_bridge *br,
 888                                              const struct net_bridge_port *port,
 889                                              struct net_bridge_vlan_group *vg,
 890                                              struct sk_buff *skb)
 891 {
 892         return skb;
 893 }
 894
 895 static inline int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags)
 896 {
 897         return -EOPNOTSUPP;
 898 }
 899
 900 static inline int br_vlan_delete(struct net_bridge *br, u16 vid)
 901 {
 902         return -EOPNOTSUPP;
 903 }
 904
 905 static inline void br_vlan_flush(struct net_bridge *br)
 906 {
 907 }
 908
 909 static inline void br_recalculate_fwd_mask(struct net_bridge *br)
 910 {
 911 }
 912
 913 static inline int br_vlan_init(struct net_bridge *br)
 914 {
 915         return 0;
 916 }
 917
 918 static inline int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags)
 919 {
 920         return -EOPNOTSUPP;
 921 }
 922
 923 static inline int nbp_vlan_delete(struct net_bridge_port *port, u16 vid)
 924 {
 925         return -EOPNOTSUPP;
 926 }
 927
 928 static inline void nbp_vlan_flush(struct net_bridge_port *port)
 929 {
 930 }
 931
 932 static inline struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg,
 933                                                    u16 vid)
 934 {
 935         return NULL;
 936 }
 937
 938 static inline int nbp_vlan_init(struct net_bridge_port *port)
 939 {
 940         return 0;
 941 }
 942
 943 static inline u16 br_vlan_get_tag(const struct sk_buff *skb, u16 *tag)
 944 {
 945         return 0;
 946 }
 947
 948 static inline u16 br_get_pvid(const struct net_bridge_vlan_group *vg)
 949 {
 950         return 0;
 951 }
 952
 953 static inline int __br_vlan_filter_toggle(struct net_bridge *br,
 954                                           unsigned long val)
 955 {
 956         return -EOPNOTSUPP;
 957 }
 958
 959 static inline int nbp_get_num_vlan_infos(struct net_bridge_port *p,
 960                                          u32 filter_mask)
 961 {
 962         return 0;
 963 }
 964
 965 static inline struct net_bridge_vlan_group *br_vlan_group(
 966                                         const struct net_bridge *br)
 967 {
 968         return NULL;
 969 }
 970
 971 static inline struct net_bridge_vlan_group *nbp_vlan_group(
 972                                         const struct net_bridge_port *p)
 973 {
 974         return NULL;
 975 }
 976
 977 static inline struct net_bridge_vlan_group *br_vlan_group_rcu(
 978                                         const struct net_bridge *br)
 979 {
 980         return NULL;
 981 }
 982
 983 static inline struct net_bridge_vlan_group *nbp_vlan_group_rcu(
 984                                         const struct net_bridge_port *p)
 985 {
 986         return NULL;
 987 }
 988
 989 static inline void br_vlan_get_stats(const struct net_bridge_vlan *v,
 990                                      struct br_vlan_stats *stats)
 991 {
 992 }
 993 #endif
 994
 995 struct nf_br_ops {
 996         int (*br_dev_xmit_hook)(struct sk_buff *skb);
 997 };
 998 extern const struct nf_br_ops __rcu *nf_br_ops;
 999
1000 /* br_netfilter.c */
1001 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
1002 int br_nf_core_init(void);
1003 void br_nf_core_fini(void);
1004 void br_netfilter_rtable_init(struct net_bridge *);
1005 #else
1006 static inline int br_nf_core_init(void) { return 0; }
1007 static inline void br_nf_core_fini(void) {}
1008 #define br_netfilter_rtable_init(x)
1009 #endif
1010
1011 /* br_stp.c */
1012 void br_set_state(struct net_bridge_port *p, unsigned int state);
1013 struct net_bridge_port *br_get_port(struct net_bridge *br, u16 port_no);
1014 void br_init_port(struct net_bridge_port *p);
1015 void br_become_designated_port(struct net_bridge_port *p);
1016
1017 void __br_set_forward_delay(struct net_bridge *br, unsigned long t);
1018 int br_set_forward_delay(struct net_bridge *br, unsigned long x);
1019 int br_set_hello_time(struct net_bridge *br, unsigned long x);
1020 int br_set_max_age(struct net_bridge *br, unsigned long x);
1021 int __set_ageing_time(struct net_device *dev, unsigned long t);
1022 int br_set_ageing_time(struct net_bridge *br, clock_t ageing_time);
1023
1024
1025 /* br_stp_if.c */
1026 void br_stp_enable_bridge(struct net_bridge *br);
1027 void br_stp_disable_bridge(struct net_bridge *br);
1028 void br_stp_set_enabled(struct net_bridge *br, unsigned long val);
1029 void br_stp_enable_port(struct net_bridge_port *p);
1030 void br_stp_disable_port(struct net_bridge_port *p);
1031 bool br_stp_recalculate_bridge_id(struct net_bridge *br);
1032 void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *a);
1033 void br_stp_set_bridge_priority(struct net_bridge *br, u16 newprio);
1034 int br_stp_set_port_priority(struct net_bridge_port *p, unsigned long newprio);
1035 int br_stp_set_path_cost(struct net_bridge_port *p, unsigned long path_cost);
1036 ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id);
1037
1038 /* br_stp_bpdu.c */
1039 struct stp_proto;
1040 void br_stp_rcv(const struct stp_proto *proto, struct sk_buff *skb,
1041                 struct net_device *dev);
1042
1043 /* br_stp_timer.c */
1044 void br_stp_timer_init(struct net_bridge *br);
1045 void br_stp_port_timer_init(struct net_bridge_port *p);
1046 unsigned long br_timer_value(const struct timer_list *timer);
1047
1048 /* br.c */
1049 #if IS_ENABLED(CONFIG_ATM_LANE)
1050 extern int (*br_fdb_test_addr_hook)(struct net_device *dev, unsigned char *addr);
1051 #endif
1052
1053 /* br_netlink.c */
1054 extern struct rtnl_link_ops br_link_ops;
1055 int br_netlink_init(void);
1056 void br_netlink_fini(void);
1057 void br_ifinfo_notify(int event, struct net_bridge_port *port);
1058 int br_setlink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags);
1059 int br_dellink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags);
1060 int br_getlink(struct sk_buff *skb, u32 pid, u32 seq, struct net_device *dev,
1061                u32 filter_mask, int nlflags);
1062
1063 #ifdef CONFIG_SYSFS
1064 /* br_sysfs_if.c */
1065 extern const struct sysfs_ops brport_sysfs_ops;
1066 int br_sysfs_addif(struct net_bridge_port *p);
1067 int br_sysfs_renameif(struct net_bridge_port *p);
1068
1069 /* br_sysfs_br.c */
1070 int br_sysfs_addbr(struct net_device *dev);
1071 void br_sysfs_delbr(struct net_device *dev);
1072
1073 #else
1074
1075 static inline int br_sysfs_addif(struct net_bridge_port *p) { return 0; }
1076 static inline int br_sysfs_renameif(struct net_bridge_port *p) { return 0; }
1077 static inline int br_sysfs_addbr(struct net_device *dev) { return 0; }
1078 static inline void br_sysfs_delbr(struct net_device *dev) { return; }
1079 #endif /* CONFIG_SYSFS */
1080
1081 /* br_switchdev.c */
1082 #ifdef CONFIG_NET_SWITCHDEV
1083 int nbp_switchdev_mark_set(struct net_bridge_port *p);
1084 void nbp_switchdev_frame_mark(const struct net_bridge_port *p,
1085                               struct sk_buff *skb);
1086 bool nbp_switchdev_allowed_egress(const struct net_bridge_port *p,
1087                                   const struct sk_buff *skb);
1088 int br_switchdev_set_port_flag(struct net_bridge_port *p,
1089                                unsigned long flags,
1090                                unsigned long mask);
1091 void br_switchdev_fdb_notify(const struct net_bridge_fdb_entry *fdb,
1092                              int type);
1093 #else
1094 static inline int nbp_switchdev_mark_set(struct net_bridge_port *p)
1095 {
1096         return 0;
1097 }
1098
1099 static inline void nbp_switchdev_frame_mark(const struct net_bridge_port *p,
1100                                             struct sk_buff *skb)
1101 {
1102 }
1103
1104 static inline bool nbp_switchdev_allowed_egress(const struct net_bridge_port *p,
1105                                                 const struct sk_buff *skb)
1106 {
1107         return true;
1108 }
1109
1110 static inline int br_switchdev_set_port_flag(struct net_bridge_port *p,
1111                                              unsigned long flags,
1112                                              unsigned long mask)
1113 {
1114         return 0;
1115 }
1116
1117 static inline void
1118 br_switchdev_fdb_notify(const struct net_bridge_fdb_entry *fdb, int type)
1119 {
1120 }
1121 #endif /* CONFIG_NET_SWITCHDEV */
1122
1123 #endif