linux/net/bridge/br_private.h
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   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
  22#define BR_HASH_BITS 8
  23#define BR_HASH_SIZE (1 << BR_HASH_BITS)
  24
  25#define BR_HOLD_TIME (1*HZ)
  26
  27#define BR_PORT_BITS    10
  28#define BR_MAX_PORTS    (1<<BR_PORT_BITS)
  29
  30#define BR_VERSION      "2.3"
  31
  32/* Control of forwarding link local multicast */
  33#define BR_GROUPFWD_DEFAULT     0
  34/* Don't allow forwarding control protocols like STP and LLDP */
  35#define BR_GROUPFWD_RESTRICTED  0x4007u
  36
  37/* Path to usermode spanning tree program */
  38#define BR_STP_PROG     "/sbin/bridge-stp"
  39
  40typedef struct bridge_id bridge_id;
  41typedef struct mac_addr mac_addr;
  42typedef __u16 port_id;
  43
  44struct bridge_id
  45{
  46        unsigned char   prio[2];
  47        unsigned char   addr[6];
  48};
  49
  50struct mac_addr
  51{
  52        unsigned char   addr[6];
  53};
  54
  55struct br_ip
  56{
  57        union {
  58                __be32  ip4;
  59#if IS_ENABLED(CONFIG_IPV6)
  60                struct in6_addr ip6;
  61#endif
  62        } u;
  63        __be16          proto;
  64};
  65
  66struct net_bridge_fdb_entry
  67{
  68        struct hlist_node               hlist;
  69        struct net_bridge_port          *dst;
  70
  71        struct rcu_head                 rcu;
  72        unsigned long                   updated;
  73        unsigned long                   used;
  74        mac_addr                        addr;
  75        unsigned char                   is_local;
  76        unsigned char                   is_static;
  77};
  78
  79struct net_bridge_port_group {
  80        struct net_bridge_port          *port;
  81        struct net_bridge_port_group __rcu *next;
  82        struct hlist_node               mglist;
  83        struct rcu_head                 rcu;
  84        struct timer_list               timer;
  85        struct br_ip                    addr;
  86};
  87
  88struct net_bridge_mdb_entry
  89{
  90        struct hlist_node               hlist[2];
  91        struct net_bridge               *br;
  92        struct net_bridge_port_group __rcu *ports;
  93        struct rcu_head                 rcu;
  94        struct timer_list               timer;
  95        struct br_ip                    addr;
  96        bool                            mglist;
  97};
  98
  99struct net_bridge_mdb_htable
 100{
 101        struct hlist_head               *mhash;
 102        struct rcu_head                 rcu;
 103        struct net_bridge_mdb_htable    *old;
 104        u32                             size;
 105        u32                             max;
 106        u32                             secret;
 107        u32                             ver;
 108};
 109
 110struct net_bridge_port
 111{
 112        struct net_bridge               *br;
 113        struct net_device               *dev;
 114        struct list_head                list;
 115
 116        /* STP */
 117        u8                              priority;
 118        u8                              state;
 119        u16                             port_no;
 120        unsigned char                   topology_change_ack;
 121        unsigned char                   config_pending;
 122        port_id                         port_id;
 123        port_id                         designated_port;
 124        bridge_id                       designated_root;
 125        bridge_id                       designated_bridge;
 126        u32                             path_cost;
 127        u32                             designated_cost;
 128        unsigned long                   designated_age;
 129
 130        struct timer_list               forward_delay_timer;
 131        struct timer_list               hold_timer;
 132        struct timer_list               message_age_timer;
 133        struct kobject                  kobj;
 134        struct rcu_head                 rcu;
 135
 136        unsigned long                   flags;
 137#define BR_HAIRPIN_MODE         0x00000001
 138
 139#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 140        u32                             multicast_startup_queries_sent;
 141        unsigned char                   multicast_router;
 142        struct timer_list               multicast_router_timer;
 143        struct timer_list               multicast_query_timer;
 144        struct hlist_head               mglist;
 145        struct hlist_node               rlist;
 146#endif
 147
 148#ifdef CONFIG_SYSFS
 149        char                            sysfs_name[IFNAMSIZ];
 150#endif
 151
 152#ifdef CONFIG_NET_POLL_CONTROLLER
 153        struct netpoll                  *np;
 154#endif
 155};
 156
 157#define br_port_exists(dev) (dev->priv_flags & IFF_BRIDGE_PORT)
 158
 159static inline struct net_bridge_port *br_port_get_rcu(const struct net_device *dev)
 160{
 161        struct net_bridge_port *port = rcu_dereference(dev->rx_handler_data);
 162        return br_port_exists(dev) ? port : NULL;
 163}
 164
 165static inline struct net_bridge_port *br_port_get_rtnl(struct net_device *dev)
 166{
 167        return br_port_exists(dev) ?
 168                rtnl_dereference(dev->rx_handler_data) : NULL;
 169}
 170
 171struct br_cpu_netstats {
 172        u64                     rx_packets;
 173        u64                     rx_bytes;
 174        u64                     tx_packets;
 175        u64                     tx_bytes;
 176        struct u64_stats_sync   syncp;
 177};
 178
 179struct net_bridge
 180{
 181        spinlock_t                      lock;
 182        struct list_head                port_list;
 183        struct net_device               *dev;
 184
 185        struct br_cpu_netstats __percpu *stats;
 186        spinlock_t                      hash_lock;
 187        struct hlist_head               hash[BR_HASH_SIZE];
 188#ifdef CONFIG_BRIDGE_NETFILTER
 189        struct rtable                   fake_rtable;
 190        bool                            nf_call_iptables;
 191        bool                            nf_call_ip6tables;
 192        bool                            nf_call_arptables;
 193#endif
 194        unsigned long                   flags;
 195#define BR_SET_MAC_ADDR         0x00000001
 196
 197        u16                             group_fwd_mask;
 198
 199        /* STP */
 200        bridge_id                       designated_root;
 201        bridge_id                       bridge_id;
 202        u32                             root_path_cost;
 203        unsigned long                   max_age;
 204        unsigned long                   hello_time;
 205        unsigned long                   forward_delay;
 206        unsigned long                   bridge_max_age;
 207        unsigned long                   ageing_time;
 208        unsigned long                   bridge_hello_time;
 209        unsigned long                   bridge_forward_delay;
 210
 211        u8                              group_addr[ETH_ALEN];
 212        u16                             root_port;
 213
 214        enum {
 215                BR_NO_STP,              /* no spanning tree */
 216                BR_KERNEL_STP,          /* old STP in kernel */
 217                BR_USER_STP,            /* new RSTP in userspace */
 218        } stp_enabled;
 219
 220        unsigned char                   topology_change;
 221        unsigned char                   topology_change_detected;
 222
 223#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 224        unsigned char                   multicast_router;
 225
 226        u8                              multicast_disabled:1;
 227        u8                              multicast_querier:1;
 228
 229        u32                             hash_elasticity;
 230        u32                             hash_max;
 231
 232        u32                             multicast_last_member_count;
 233        u32                             multicast_startup_queries_sent;
 234        u32                             multicast_startup_query_count;
 235
 236        unsigned long                   multicast_last_member_interval;
 237        unsigned long                   multicast_membership_interval;
 238        unsigned long                   multicast_querier_interval;
 239        unsigned long                   multicast_query_interval;
 240        unsigned long                   multicast_query_response_interval;
 241        unsigned long                   multicast_startup_query_interval;
 242
 243        spinlock_t                      multicast_lock;
 244        struct net_bridge_mdb_htable __rcu *mdb;
 245        struct hlist_head               router_list;
 246
 247        struct timer_list               multicast_router_timer;
 248        struct timer_list               multicast_querier_timer;
 249        struct timer_list               multicast_query_timer;
 250#endif
 251
 252        struct timer_list               hello_timer;
 253        struct timer_list               tcn_timer;
 254        struct timer_list               topology_change_timer;
 255        struct timer_list               gc_timer;
 256        struct kobject                  *ifobj;
 257};
 258
 259struct br_input_skb_cb {
 260        struct net_device *brdev;
 261#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 262        int igmp;
 263        int mrouters_only;
 264#endif
 265};
 266
 267#define BR_INPUT_SKB_CB(__skb)  ((struct br_input_skb_cb *)(__skb)->cb)
 268
 269#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 270# define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb)   (BR_INPUT_SKB_CB(__skb)->mrouters_only)
 271#else
 272# define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb)   (0)
 273#endif
 274
 275#define br_printk(level, br, format, args...)   \
 276        printk(level "%s: " format, (br)->dev->name, ##args)
 277
 278#define br_err(__br, format, args...)                   \
 279        br_printk(KERN_ERR, __br, format, ##args)
 280#define br_warn(__br, format, args...)                  \
 281        br_printk(KERN_WARNING, __br, format, ##args)
 282#define br_notice(__br, format, args...)                \
 283        br_printk(KERN_NOTICE, __br, format, ##args)
 284#define br_info(__br, format, args...)                  \
 285        br_printk(KERN_INFO, __br, format, ##args)
 286
 287#define br_debug(br, format, args...)                   \
 288        pr_debug("%s: " format,  (br)->dev->name, ##args)
 289
 290extern struct notifier_block br_device_notifier;
 291extern const u8 br_group_address[ETH_ALEN];
 292
 293/* called under bridge lock */
 294static inline int br_is_root_bridge(const struct net_bridge *br)
 295{
 296        return !memcmp(&br->bridge_id, &br->designated_root, 8);
 297}
 298
 299/* br_device.c */
 300extern void br_dev_setup(struct net_device *dev);
 301extern void br_dev_delete(struct net_device *dev, struct list_head *list);
 302extern netdev_tx_t br_dev_xmit(struct sk_buff *skb,
 303                               struct net_device *dev);
 304#ifdef CONFIG_NET_POLL_CONTROLLER
 305static inline struct netpoll_info *br_netpoll_info(struct net_bridge *br)
 306{
 307        return br->dev->npinfo;
 308}
 309
 310static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
 311                                       struct sk_buff *skb)
 312{
 313        struct netpoll *np = p->np;
 314
 315        if (np)
 316                netpoll_send_skb(np, skb);
 317}
 318
 319extern int br_netpoll_enable(struct net_bridge_port *p, gfp_t gfp);
 320extern void br_netpoll_disable(struct net_bridge_port *p);
 321#else
 322static inline struct netpoll_info *br_netpoll_info(struct net_bridge *br)
 323{
 324        return NULL;
 325}
 326
 327static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
 328                                       struct sk_buff *skb)
 329{
 330}
 331
 332static inline int br_netpoll_enable(struct net_bridge_port *p, gfp_t gfp)
 333{
 334        return 0;
 335}
 336
 337static inline void br_netpoll_disable(struct net_bridge_port *p)
 338{
 339}
 340#endif
 341
 342/* br_fdb.c */
 343extern int br_fdb_init(void);
 344extern void br_fdb_fini(void);
 345extern void br_fdb_flush(struct net_bridge *br);
 346extern void br_fdb_changeaddr(struct net_bridge_port *p,
 347                              const unsigned char *newaddr);
 348extern void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr);
 349extern void br_fdb_cleanup(unsigned long arg);
 350extern void br_fdb_delete_by_port(struct net_bridge *br,
 351                                  const struct net_bridge_port *p, int do_all);
 352extern struct net_bridge_fdb_entry *__br_fdb_get(struct net_bridge *br,
 353                                                 const unsigned char *addr);
 354extern int br_fdb_test_addr(struct net_device *dev, unsigned char *addr);
 355extern int br_fdb_fillbuf(struct net_bridge *br, void *buf,
 356                          unsigned long count, unsigned long off);
 357extern int br_fdb_insert(struct net_bridge *br,
 358                         struct net_bridge_port *source,
 359                         const unsigned char *addr);
 360extern void br_fdb_update(struct net_bridge *br,
 361                          struct net_bridge_port *source,
 362                          const unsigned char *addr);
 363
 364extern int br_fdb_delete(struct ndmsg *ndm,
 365                         struct net_device *dev,
 366                         unsigned char *addr);
 367extern int br_fdb_add(struct ndmsg *nlh,
 368                      struct net_device *dev,
 369                      unsigned char *addr,
 370                      u16 nlh_flags);
 371extern int br_fdb_dump(struct sk_buff *skb,
 372                       struct netlink_callback *cb,
 373                       struct net_device *dev,
 374                       int idx);
 375
 376/* br_forward.c */
 377extern void br_deliver(const struct net_bridge_port *to,
 378                struct sk_buff *skb);
 379extern int br_dev_queue_push_xmit(struct sk_buff *skb);
 380extern void br_forward(const struct net_bridge_port *to,
 381                struct sk_buff *skb, struct sk_buff *skb0);
 382extern int br_forward_finish(struct sk_buff *skb);
 383extern void br_flood_deliver(struct net_bridge *br, struct sk_buff *skb);
 384extern void br_flood_forward(struct net_bridge *br, struct sk_buff *skb,
 385                             struct sk_buff *skb2);
 386
 387/* br_if.c */
 388extern void br_port_carrier_check(struct net_bridge_port *p);
 389extern int br_add_bridge(struct net *net, const char *name);
 390extern int br_del_bridge(struct net *net, const char *name);
 391extern void br_net_exit(struct net *net);
 392extern int br_add_if(struct net_bridge *br,
 393              struct net_device *dev);
 394extern int br_del_if(struct net_bridge *br,
 395              struct net_device *dev);
 396extern int br_min_mtu(const struct net_bridge *br);
 397extern netdev_features_t br_features_recompute(struct net_bridge *br,
 398        netdev_features_t features);
 399
 400/* br_input.c */
 401extern int br_handle_frame_finish(struct sk_buff *skb);
 402extern rx_handler_result_t br_handle_frame(struct sk_buff **pskb);
 403
 404/* br_ioctl.c */
 405extern int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
 406extern int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd, void __user *arg);
 407
 408/* br_multicast.c */
 409#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 410extern int br_multicast_rcv(struct net_bridge *br,
 411                            struct net_bridge_port *port,
 412                            struct sk_buff *skb);
 413extern struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
 414                                               struct sk_buff *skb);
 415extern void br_multicast_add_port(struct net_bridge_port *port);
 416extern void br_multicast_del_port(struct net_bridge_port *port);
 417extern void br_multicast_enable_port(struct net_bridge_port *port);
 418extern void br_multicast_disable_port(struct net_bridge_port *port);
 419extern void br_multicast_init(struct net_bridge *br);
 420extern void br_multicast_open(struct net_bridge *br);
 421extern void br_multicast_stop(struct net_bridge *br);
 422extern void br_multicast_deliver(struct net_bridge_mdb_entry *mdst,
 423                                 struct sk_buff *skb);
 424extern void br_multicast_forward(struct net_bridge_mdb_entry *mdst,
 425                                 struct sk_buff *skb, struct sk_buff *skb2);
 426extern int br_multicast_set_router(struct net_bridge *br, unsigned long val);
 427extern int br_multicast_set_port_router(struct net_bridge_port *p,
 428                                        unsigned long val);
 429extern int br_multicast_toggle(struct net_bridge *br, unsigned long val);
 430extern int br_multicast_set_querier(struct net_bridge *br, unsigned long val);
 431extern int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val);
 432
 433static inline bool br_multicast_is_router(struct net_bridge *br)
 434{
 435        return br->multicast_router == 2 ||
 436               (br->multicast_router == 1 &&
 437                timer_pending(&br->multicast_router_timer));
 438}
 439#else
 440static inline int br_multicast_rcv(struct net_bridge *br,
 441                                   struct net_bridge_port *port,
 442                                   struct sk_buff *skb)
 443{
 444        return 0;
 445}
 446
 447static inline struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
 448                                                      struct sk_buff *skb)
 449{
 450        return NULL;
 451}
 452
 453static inline void br_multicast_add_port(struct net_bridge_port *port)
 454{
 455}
 456
 457static inline void br_multicast_del_port(struct net_bridge_port *port)
 458{
 459}
 460
 461static inline void br_multicast_enable_port(struct net_bridge_port *port)
 462{
 463}
 464
 465static inline void br_multicast_disable_port(struct net_bridge_port *port)
 466{
 467}
 468
 469static inline void br_multicast_init(struct net_bridge *br)
 470{
 471}
 472
 473static inline void br_multicast_open(struct net_bridge *br)
 474{
 475}
 476
 477static inline void br_multicast_stop(struct net_bridge *br)
 478{
 479}
 480
 481static inline void br_multicast_deliver(struct net_bridge_mdb_entry *mdst,
 482                                        struct sk_buff *skb)
 483{
 484}
 485
 486static inline void br_multicast_forward(struct net_bridge_mdb_entry *mdst,
 487                                        struct sk_buff *skb,
 488                                        struct sk_buff *skb2)
 489{
 490}
 491static inline bool br_multicast_is_router(struct net_bridge *br)
 492{
 493        return 0;
 494}
 495#endif
 496
 497/* br_netfilter.c */
 498#ifdef CONFIG_BRIDGE_NETFILTER
 499extern int br_netfilter_init(void);
 500extern void br_netfilter_fini(void);
 501extern void br_netfilter_rtable_init(struct net_bridge *);
 502#else
 503#define br_netfilter_init()     (0)
 504#define br_netfilter_fini()     do { } while(0)
 505#define br_netfilter_rtable_init(x)
 506#endif
 507
 508/* br_stp.c */
 509extern void br_log_state(const struct net_bridge_port *p);
 510extern struct net_bridge_port *br_get_port(struct net_bridge *br,
 511                                           u16 port_no);
 512extern void br_init_port(struct net_bridge_port *p);
 513extern void br_become_designated_port(struct net_bridge_port *p);
 514
 515extern int br_set_forward_delay(struct net_bridge *br, unsigned long x);
 516extern int br_set_hello_time(struct net_bridge *br, unsigned long x);
 517extern int br_set_max_age(struct net_bridge *br, unsigned long x);
 518
 519
 520/* br_stp_if.c */
 521extern void br_stp_enable_bridge(struct net_bridge *br);
 522extern void br_stp_disable_bridge(struct net_bridge *br);
 523extern void br_stp_set_enabled(struct net_bridge *br, unsigned long val);
 524extern void br_stp_enable_port(struct net_bridge_port *p);
 525extern void br_stp_disable_port(struct net_bridge_port *p);
 526extern bool br_stp_recalculate_bridge_id(struct net_bridge *br);
 527extern void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *a);
 528extern void br_stp_set_bridge_priority(struct net_bridge *br,
 529                                       u16 newprio);
 530extern int br_stp_set_port_priority(struct net_bridge_port *p,
 531                                    unsigned long newprio);
 532extern int br_stp_set_path_cost(struct net_bridge_port *p,
 533                                unsigned long path_cost);
 534extern ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id);
 535
 536/* br_stp_bpdu.c */
 537struct stp_proto;
 538extern void br_stp_rcv(const struct stp_proto *proto, struct sk_buff *skb,
 539                       struct net_device *dev);
 540
 541/* br_stp_timer.c */
 542extern void br_stp_timer_init(struct net_bridge *br);
 543extern void br_stp_port_timer_init(struct net_bridge_port *p);
 544extern unsigned long br_timer_value(const struct timer_list *timer);
 545
 546/* br.c */
 547#if IS_ENABLED(CONFIG_ATM_LANE)
 548extern int (*br_fdb_test_addr_hook)(struct net_device *dev, unsigned char *addr);
 549#endif
 550
 551/* br_netlink.c */
 552extern struct rtnl_link_ops br_link_ops;
 553extern int br_netlink_init(void);
 554extern void br_netlink_fini(void);
 555extern void br_ifinfo_notify(int event, struct net_bridge_port *port);
 556
 557#ifdef CONFIG_SYSFS
 558/* br_sysfs_if.c */
 559extern const struct sysfs_ops brport_sysfs_ops;
 560extern int br_sysfs_addif(struct net_bridge_port *p);
 561extern int br_sysfs_renameif(struct net_bridge_port *p);
 562
 563/* br_sysfs_br.c */
 564extern int br_sysfs_addbr(struct net_device *dev);
 565extern void br_sysfs_delbr(struct net_device *dev);
 566
 567#else
 568
 569#define br_sysfs_addif(p)       (0)
 570#define br_sysfs_renameif(p)    (0)
 571#define br_sysfs_addbr(dev)     (0)
 572#define br_sysfs_delbr(dev)     do { } while(0)
 573#endif /* CONFIG_SYSFS */
 574
 575#endif
 576
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