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1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/*
3 * Linux ethernet bridge
4 *
5 * Authors:
6 * Lennert Buytenhek <buytenh@gnu.org>
7 */
8
9#ifndef _BR_PRIVATE_H
10#define _BR_PRIVATE_H
11
12#include <linux/netdevice.h>
13#include <linux/if_bridge.h>
14#include <linux/netpoll.h>
15#include <linux/u64_stats_sync.h>
16#include <net/route.h>
17#include <net/ip6_fib.h>
18#include <linux/if_vlan.h>
19#include <linux/rhashtable.h>
20#include <linux/refcount.h>
21
22#define BR_HASH_BITS 8
23#define BR_HASH_SIZE (1 << BR_HASH_BITS)
24
25#define BR_HOLD_TIME (1*HZ)
26
27#define BR_PORT_BITS 10
28#define BR_MAX_PORTS (1<<BR_PORT_BITS)
29
30#define BR_MULTICAST_DEFAULT_HASH_MAX 4096
31
32#define BR_VERSION "2.3"
33
34/* Control of forwarding link local multicast */
35#define BR_GROUPFWD_DEFAULT 0
36/* Don't allow forwarding of control protocols like STP, MAC PAUSE and LACP */
37enum {
38 BR_GROUPFWD_STP = BIT(0),
39 BR_GROUPFWD_MACPAUSE = BIT(1),
40 BR_GROUPFWD_LACP = BIT(2),
41};
42
43#define BR_GROUPFWD_RESTRICTED (BR_GROUPFWD_STP | BR_GROUPFWD_MACPAUSE | \
44 BR_GROUPFWD_LACP)
45/* The Nearest Customer Bridge Group Address, 01-80-C2-00-00-[00,0B,0C,0D,0F] */
46#define BR_GROUPFWD_8021AD 0xB801u
47
48/* Path to usermode spanning tree program */
49#define BR_STP_PROG "/sbin/bridge-stp"
50
51typedef struct bridge_id bridge_id;
52typedef struct mac_addr mac_addr;
53typedef __u16 port_id;
54
55struct bridge_id {
56 unsigned char prio[2];
57 unsigned char addr[ETH_ALEN];
58};
59
60struct mac_addr {
61 unsigned char addr[ETH_ALEN];
62};
63
64#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
65/* our own querier */
66struct bridge_mcast_own_query {
67 struct timer_list timer;
68 u32 startup_sent;
69};
70
71/* other querier */
72struct bridge_mcast_other_query {
73 struct timer_list timer;
74 unsigned long delay_time;
75};
76
77/* selected querier */
78struct bridge_mcast_querier {
79 struct br_ip addr;
80 struct net_bridge_port __rcu *port;
81};
82
83/* IGMP/MLD statistics */
84struct bridge_mcast_stats {
85 struct br_mcast_stats mstats;
86 struct u64_stats_sync syncp;
87};
88#endif
89
90struct br_vlan_stats {
91 u64 rx_bytes;
92 u64 rx_packets;
93 u64 tx_bytes;
94 u64 tx_packets;
95 struct u64_stats_sync syncp;
96};
97
98struct br_tunnel_info {
99 __be64 tunnel_id;
100 struct metadata_dst *tunnel_dst;
101};
102
103/* private vlan flags */
104enum {
105 BR_VLFLAG_PER_PORT_STATS = BIT(0),
106 BR_VLFLAG_ADDED_BY_SWITCHDEV = BIT(1),
107};
108
109/**
110 * struct net_bridge_vlan - per-vlan entry
111 *
112 * @vnode: rhashtable member
113 * @vid: VLAN id
114 * @flags: bridge vlan flags
115 * @priv_flags: private (in-kernel) bridge vlan flags
116 * @stats: per-cpu VLAN statistics
117 * @br: if MASTER flag set, this points to a bridge struct
118 * @port: if MASTER flag unset, this points to a port struct
119 * @refcnt: if MASTER flag set, this is bumped for each port referencing it
120 * @brvlan: if MASTER flag unset, this points to the global per-VLAN context
121 * for this VLAN entry
122 * @vlist: sorted list of VLAN entries
123 * @rcu: used for entry destruction
124 *
125 * This structure is shared between the global per-VLAN entries contained in
126 * the bridge rhashtable and the local per-port per-VLAN entries contained in
127 * the port's rhashtable. The union entries should be interpreted depending on
128 * the entry flags that are set.
129 */
130struct net_bridge_vlan {
131 struct rhash_head vnode;
132 struct rhash_head tnode;
133 u16 vid;
134 u16 flags;
135 u16 priv_flags;
136 struct br_vlan_stats __percpu *stats;
137 union {
138 struct net_bridge *br;
139 struct net_bridge_port *port;
140 };
141 union {
142 refcount_t refcnt;
143 struct net_bridge_vlan *brvlan;
144 };
145
146 struct br_tunnel_info tinfo;
147
148 struct list_head vlist;
149
150 struct rcu_head rcu;
151};
152
153/**
154 * struct net_bridge_vlan_group
155 *
156 * @vlan_hash: VLAN entry rhashtable
157 * @vlan_list: sorted VLAN entry list
158 * @num_vlans: number of total VLAN entries
159 * @pvid: PVID VLAN id
160 *
161 * IMPORTANT: Be careful when checking if there're VLAN entries using list
162 * primitives because the bridge can have entries in its list which
163 * are just for global context but not for filtering, i.e. they have
164 * the master flag set but not the brentry flag. If you have to check
165 * if there're "real" entries in the bridge please test @num_vlans
166 */
167struct net_bridge_vlan_group {
168 struct rhashtable vlan_hash;
169 struct rhashtable tunnel_hash;
170 struct list_head vlan_list;
171 u16 num_vlans;
172 u16 pvid;
173};
174
175struct net_bridge_fdb_key {
176 mac_addr addr;
177 u16 vlan_id;
178};
179
180struct net_bridge_fdb_entry {
181 struct rhash_head rhnode;
182 struct net_bridge_port *dst;
183
184 struct net_bridge_fdb_key key;
185 struct hlist_node fdb_node;
186 unsigned char is_local:1,
187 is_static:1,
188 is_sticky:1,
189 added_by_user:1,
190 added_by_external_learn:1,
191 offloaded:1;
192
193 /* write-heavy members should not affect lookups */
194 unsigned long updated ____cacheline_aligned_in_smp;
195 unsigned long used;
196
197 struct rcu_head rcu;
198};
199
200#define MDB_PG_FLAGS_PERMANENT BIT(0)
201#define MDB_PG_FLAGS_OFFLOAD BIT(1)
202#define MDB_PG_FLAGS_FAST_LEAVE BIT(2)
203
204struct net_bridge_port_group {
205 struct net_bridge_port *port;
206 struct net_bridge_port_group __rcu *next;
207 struct hlist_node mglist;
208 struct rcu_head rcu;
209 struct timer_list timer;
210 struct br_ip addr;
211 unsigned char flags;
212 unsigned char eth_addr[ETH_ALEN];
213};
214
215struct net_bridge_mdb_entry {
216 struct rhash_head rhnode;
217 struct net_bridge *br;
218 struct net_bridge_port_group __rcu *ports;
219 struct rcu_head rcu;
220 struct timer_list timer;
221 struct br_ip addr;
222 bool host_joined;
223 struct hlist_node mdb_node;
224};
225
226struct net_bridge_port {
227 struct net_bridge *br;
228 struct net_device *dev;
229 struct list_head list;
230
231 unsigned long flags;
232#ifdef CONFIG_BRIDGE_VLAN_FILTERING
233 struct net_bridge_vlan_group __rcu *vlgrp;
234#endif
235 struct net_bridge_port __rcu *backup_port;
236
237 /* STP */
238 u8 priority;
239 u8 state;
240 u16 port_no;
241 unsigned char topology_change_ack;
242 unsigned char config_pending;
243 port_id port_id;
244 port_id designated_port;
245 bridge_id designated_root;
246 bridge_id designated_bridge;
247 u32 path_cost;
248 u32 designated_cost;
249 unsigned long designated_age;
250
251 struct timer_list forward_delay_timer;
252 struct timer_list hold_timer;
253 struct timer_list message_age_timer;
254 struct kobject kobj;
255 struct rcu_head rcu;
256
257#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
258 struct bridge_mcast_own_query ip4_own_query;
259#if IS_ENABLED(CONFIG_IPV6)
260 struct bridge_mcast_own_query ip6_own_query;
261#endif /* IS_ENABLED(CONFIG_IPV6) */
262 unsigned char multicast_router;
263 struct bridge_mcast_stats __percpu *mcast_stats;
264 struct timer_list multicast_router_timer;
265 struct hlist_head mglist;
266 struct hlist_node rlist;
267#endif
268
269#ifdef CONFIG_SYSFS
270 char sysfs_name[IFNAMSIZ];
271#endif
272
273#ifdef CONFIG_NET_POLL_CONTROLLER
274 struct netpoll *np;
275#endif
276#ifdef CONFIG_NET_SWITCHDEV
277 int offload_fwd_mark;
278#endif
279 u16 group_fwd_mask;
280 u16 backup_redirected_cnt;
281};
282
283#define kobj_to_brport(obj) container_of(obj, struct net_bridge_port, kobj)
284
285#define br_auto_port(p) ((p)->flags & BR_AUTO_MASK)
286#define br_promisc_port(p) ((p)->flags & BR_PROMISC)
287
288static inline struct net_bridge_port *br_port_get_rcu(const struct net_device *dev)
289{
290 return rcu_dereference(dev->rx_handler_data);
291}
292
293static inline struct net_bridge_port *br_port_get_rtnl(const struct net_device *dev)
294{
295 return netif_is_bridge_port(dev) ?
296 rtnl_dereference(dev->rx_handler_data) : NULL;
297}
298
299static inline struct net_bridge_port *br_port_get_rtnl_rcu(const struct net_device *dev)
300{
301 return netif_is_bridge_port(dev) ?
302 rcu_dereference_rtnl(dev->rx_handler_data) : NULL;
303}
304
305enum net_bridge_opts {
306 BROPT_VLAN_ENABLED,
307 BROPT_VLAN_STATS_ENABLED,
308 BROPT_NF_CALL_IPTABLES,
309 BROPT_NF_CALL_IP6TABLES,
310 BROPT_NF_CALL_ARPTABLES,
311 BROPT_GROUP_ADDR_SET,
312 BROPT_MULTICAST_ENABLED,
313 BROPT_MULTICAST_QUERIER,
314 BROPT_MULTICAST_QUERY_USE_IFADDR,
315 BROPT_MULTICAST_STATS_ENABLED,
316 BROPT_HAS_IPV6_ADDR,
317 BROPT_NEIGH_SUPPRESS_ENABLED,
318 BROPT_MTU_SET_BY_USER,
319 BROPT_VLAN_STATS_PER_PORT,
320 BROPT_NO_LL_LEARN,
321 BROPT_VLAN_BRIDGE_BINDING,
322};
323
324struct net_bridge {
325 spinlock_t lock;
326 spinlock_t hash_lock;
327 struct list_head port_list;
328 struct net_device *dev;
329 struct pcpu_sw_netstats __percpu *stats;
330 unsigned long options;
331 /* These fields are accessed on each packet */
332#ifdef CONFIG_BRIDGE_VLAN_FILTERING
333 __be16 vlan_proto;
334 u16 default_pvid;
335 struct net_bridge_vlan_group __rcu *vlgrp;
336#endif
337
338 struct rhashtable fdb_hash_tbl;
339#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
340 union {
341 struct rtable fake_rtable;
342 struct rt6_info fake_rt6_info;
343 };
344#endif
345 u16 group_fwd_mask;
346 u16 group_fwd_mask_required;
347
348 /* STP */
349 bridge_id designated_root;
350 bridge_id bridge_id;
351 unsigned char topology_change;
352 unsigned char topology_change_detected;
353 u16 root_port;
354 unsigned long max_age;
355 unsigned long hello_time;
356 unsigned long forward_delay;
357 unsigned long ageing_time;
358 unsigned long bridge_max_age;
359 unsigned long bridge_hello_time;
360 unsigned long bridge_forward_delay;
361 unsigned long bridge_ageing_time;
362 u32 root_path_cost;
363
364 u8 group_addr[ETH_ALEN];
365
366 enum {
367 BR_NO_STP, /* no spanning tree */
368 BR_KERNEL_STP, /* old STP in kernel */
369 BR_USER_STP, /* new RSTP in userspace */
370 } stp_enabled;
371
372#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
373
374 u32 hash_max;
375
376 u32 multicast_last_member_count;
377 u32 multicast_startup_query_count;
378
379 u8 multicast_igmp_version;
380 u8 multicast_router;
381#if IS_ENABLED(CONFIG_IPV6)
382 u8 multicast_mld_version;
383#endif
384 spinlock_t multicast_lock;
385 unsigned long multicast_last_member_interval;
386 unsigned long multicast_membership_interval;
387 unsigned long multicast_querier_interval;
388 unsigned long multicast_query_interval;
389 unsigned long multicast_query_response_interval;
390 unsigned long multicast_startup_query_interval;
391
392 struct rhashtable mdb_hash_tbl;
393
394 struct hlist_head mdb_list;
395 struct hlist_head router_list;
396
397 struct timer_list multicast_router_timer;
398 struct bridge_mcast_other_query ip4_other_query;
399 struct bridge_mcast_own_query ip4_own_query;
400 struct bridge_mcast_querier ip4_querier;
401 struct bridge_mcast_stats __percpu *mcast_stats;
402#if IS_ENABLED(CONFIG_IPV6)
403 struct bridge_mcast_other_query ip6_other_query;
404 struct bridge_mcast_own_query ip6_own_query;
405 struct bridge_mcast_querier ip6_querier;
406#endif /* IS_ENABLED(CONFIG_IPV6) */
407#endif
408
409 struct timer_list hello_timer;
410 struct timer_list tcn_timer;
411 struct timer_list topology_change_timer;
412 struct delayed_work gc_work;
413 struct kobject *ifobj;
414 u32 auto_cnt;
415
416#ifdef CONFIG_NET_SWITCHDEV
417 int offload_fwd_mark;
418#endif
419 struct hlist_head fdb_list;
420};
421
422struct br_input_skb_cb {
423 struct net_device *brdev;
424
425 u16 frag_max_size;
426#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
427 u8 igmp;
428 u8 mrouters_only:1;
429#endif
430 u8 proxyarp_replied:1;
431 u8 src_port_isolated:1;
432#ifdef CONFIG_BRIDGE_VLAN_FILTERING
433 u8 vlan_filtered:1;
434#endif
435#ifdef CONFIG_NETFILTER_FAMILY_BRIDGE
436 u8 br_netfilter_broute:1;
437#endif
438
439#ifdef CONFIG_NET_SWITCHDEV
440 int offload_fwd_mark;
441#endif
442};
443
444#define BR_INPUT_SKB_CB(__skb) ((struct br_input_skb_cb *)(__skb)->cb)
445
446#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
447# define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb) (BR_INPUT_SKB_CB(__skb)->mrouters_only)
448#else
449# define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb) (0)
450#endif
451
452#define br_printk(level, br, format, args...) \
453 printk(level "%s: " format, (br)->dev->name, ##args)
454
455#define br_err(__br, format, args...) \
456 br_printk(KERN_ERR, __br, format, ##args)
457#define br_warn(__br, format, args...) \
458 br_printk(KERN_WARNING, __br, format, ##args)
459#define br_notice(__br, format, args...) \
460 br_printk(KERN_NOTICE, __br, format, ##args)
461#define br_info(__br, format, args...) \
462 br_printk(KERN_INFO, __br, format, ##args)
463
464#define br_debug(br, format, args...) \
465 pr_debug("%s: " format, (br)->dev->name, ##args)
466
467/* called under bridge lock */
468static inline int br_is_root_bridge(const struct net_bridge *br)
469{
470 return !memcmp(&br->bridge_id, &br->designated_root, 8);
471}
472
473/* check if a VLAN entry is global */
474static inline bool br_vlan_is_master(const struct net_bridge_vlan *v)
475{
476 return v->flags & BRIDGE_VLAN_INFO_MASTER;
477}
478
479/* check if a VLAN entry is used by the bridge */
480static inline bool br_vlan_is_brentry(const struct net_bridge_vlan *v)
481{
482 return v->flags & BRIDGE_VLAN_INFO_BRENTRY;
483}
484
485/* check if we should use the vlan entry, returns false if it's only context */
486static inline bool br_vlan_should_use(const struct net_bridge_vlan *v)
487{
488 if (br_vlan_is_master(v)) {
489 if (br_vlan_is_brentry(v))
490 return true;
491 else
492 return false;
493 }
494
495 return true;
496}
497
498static inline int br_opt_get(const struct net_bridge *br,
499 enum net_bridge_opts opt)
500{
501 return test_bit(opt, &br->options);
502}
503
504int br_boolopt_toggle(struct net_bridge *br, enum br_boolopt_id opt, bool on,
505 struct netlink_ext_ack *extack);
506int br_boolopt_get(const struct net_bridge *br, enum br_boolopt_id opt);
507int br_boolopt_multi_toggle(struct net_bridge *br,
508 struct br_boolopt_multi *bm,
509 struct netlink_ext_ack *extack);
510void br_boolopt_multi_get(const struct net_bridge *br,
511 struct br_boolopt_multi *bm);
512void br_opt_toggle(struct net_bridge *br, enum net_bridge_opts opt, bool on);
513
514/* br_device.c */
515void br_dev_setup(struct net_device *dev);
516void br_dev_delete(struct net_device *dev, struct list_head *list);
517netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev);
518#ifdef CONFIG_NET_POLL_CONTROLLER
519static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
520 struct sk_buff *skb)
521{
522 struct netpoll *np = p->np;
523
524 if (np)
525 netpoll_send_skb(np, skb);
526}
527
528int br_netpoll_enable(struct net_bridge_port *p);
529void br_netpoll_disable(struct net_bridge_port *p);
530#else
531static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
532 struct sk_buff *skb)
533{
534}
535
536static inline int br_netpoll_enable(struct net_bridge_port *p)
537{
538 return 0;
539}
540
541static inline void br_netpoll_disable(struct net_bridge_port *p)
542{
543}
544#endif
545
546/* br_fdb.c */
547int br_fdb_init(void);
548void br_fdb_fini(void);
549int br_fdb_hash_init(struct net_bridge *br);
550void br_fdb_hash_fini(struct net_bridge *br);
551void br_fdb_flush(struct net_bridge *br);
552void br_fdb_find_delete_local(struct net_bridge *br,
553 const struct net_bridge_port *p,
554 const unsigned char *addr, u16 vid);
555void br_fdb_changeaddr(struct net_bridge_port *p, const unsigned char *newaddr);
556void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr);
557void br_fdb_cleanup(struct work_struct *work);
558void br_fdb_delete_by_port(struct net_bridge *br,
559 const struct net_bridge_port *p, u16 vid, int do_all);
560struct net_bridge_fdb_entry *br_fdb_find_rcu(struct net_bridge *br,
561 const unsigned char *addr,
562 __u16 vid);
563int br_fdb_test_addr(struct net_device *dev, unsigned char *addr);
564int br_fdb_fillbuf(struct net_bridge *br, void *buf, unsigned long count,
565 unsigned long off);
566int br_fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
567 const unsigned char *addr, u16 vid);
568void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source,
569 const unsigned char *addr, u16 vid, bool added_by_user);
570
571int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
572 struct net_device *dev, const unsigned char *addr, u16 vid);
573int br_fdb_add(struct ndmsg *nlh, struct nlattr *tb[], struct net_device *dev,
574 const unsigned char *addr, u16 vid, u16 nlh_flags,
575 struct netlink_ext_ack *extack);
576int br_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
577 struct net_device *dev, struct net_device *fdev, int *idx);
578int br_fdb_get(struct sk_buff *skb, struct nlattr *tb[], struct net_device *dev,
579 const unsigned char *addr, u16 vid, u32 portid, u32 seq,
580 struct netlink_ext_ack *extack);
581int br_fdb_sync_static(struct net_bridge *br, struct net_bridge_port *p);
582void br_fdb_unsync_static(struct net_bridge *br, struct net_bridge_port *p);
583int br_fdb_external_learn_add(struct net_bridge *br, struct net_bridge_port *p,
584 const unsigned char *addr, u16 vid,
585 bool swdev_notify);
586int br_fdb_external_learn_del(struct net_bridge *br, struct net_bridge_port *p,
587 const unsigned char *addr, u16 vid,
588 bool swdev_notify);
589void br_fdb_offloaded_set(struct net_bridge *br, struct net_bridge_port *p,
590 const unsigned char *addr, u16 vid, bool offloaded);
591
592/* br_forward.c */
593enum br_pkt_type {
594 BR_PKT_UNICAST,
595 BR_PKT_MULTICAST,
596 BR_PKT_BROADCAST
597};
598int br_dev_queue_push_xmit(struct net *net, struct sock *sk, struct sk_buff *skb);
599void br_forward(const struct net_bridge_port *to, struct sk_buff *skb,
600 bool local_rcv, bool local_orig);
601int br_forward_finish(struct net *net, struct sock *sk, struct sk_buff *skb);
602void br_flood(struct net_bridge *br, struct sk_buff *skb,
603 enum br_pkt_type pkt_type, bool local_rcv, bool local_orig);
604
605/* return true if both source port and dest port are isolated */
606static inline bool br_skb_isolated(const struct net_bridge_port *to,
607 const struct sk_buff *skb)
608{
609 return BR_INPUT_SKB_CB(skb)->src_port_isolated &&
610 (to->flags & BR_ISOLATED);
611}
612
613/* br_if.c */
614void br_port_carrier_check(struct net_bridge_port *p, bool *notified);
615int br_add_bridge(struct net *net, const char *name);
616int br_del_bridge(struct net *net, const char *name);
617int br_add_if(struct net_bridge *br, struct net_device *dev,
618 struct netlink_ext_ack *extack);
619int br_del_if(struct net_bridge *br, struct net_device *dev);
620void br_mtu_auto_adjust(struct net_bridge *br);
621netdev_features_t br_features_recompute(struct net_bridge *br,
622 netdev_features_t features);
623void br_port_flags_change(struct net_bridge_port *port, unsigned long mask);
624void br_manage_promisc(struct net_bridge *br);
625int nbp_backup_change(struct net_bridge_port *p, struct net_device *backup_dev);
626
627/* br_input.c */
628int br_handle_frame_finish(struct net *net, struct sock *sk, struct sk_buff *skb);
629rx_handler_result_t br_handle_frame(struct sk_buff **pskb);
630
631static inline bool br_rx_handler_check_rcu(const struct net_device *dev)
632{
633 return rcu_dereference(dev->rx_handler) == br_handle_frame;
634}
635
636static inline bool br_rx_handler_check_rtnl(const struct net_device *dev)
637{
638 return rcu_dereference_rtnl(dev->rx_handler) == br_handle_frame;
639}
640
641static inline struct net_bridge_port *br_port_get_check_rcu(const struct net_device *dev)
642{
643 return br_rx_handler_check_rcu(dev) ? br_port_get_rcu(dev) : NULL;
644}
645
646static inline struct net_bridge_port *
647br_port_get_check_rtnl(const struct net_device *dev)
648{
649 return br_rx_handler_check_rtnl(dev) ? br_port_get_rtnl_rcu(dev) : NULL;
650}
651
652/* br_ioctl.c */
653int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
654int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd,
655 void __user *arg);
656
657/* br_multicast.c */
658#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
659int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
660 struct sk_buff *skb, u16 vid);
661struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
662 struct sk_buff *skb, u16 vid);
663int br_multicast_add_port(struct net_bridge_port *port);
664void br_multicast_del_port(struct net_bridge_port *port);
665void br_multicast_enable_port(struct net_bridge_port *port);
666void br_multicast_disable_port(struct net_bridge_port *port);
667void br_multicast_init(struct net_bridge *br);
668void br_multicast_open(struct net_bridge *br);
669void br_multicast_stop(struct net_bridge *br);
670void br_multicast_dev_del(struct net_bridge *br);
671void br_multicast_flood(struct net_bridge_mdb_entry *mdst,
672 struct sk_buff *skb, bool local_rcv, bool local_orig);
673int br_multicast_set_router(struct net_bridge *br, unsigned long val);
674int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val);
675int br_multicast_toggle(struct net_bridge *br, unsigned long val);
676int br_multicast_set_querier(struct net_bridge *br, unsigned long val);
677int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val);
678int br_multicast_set_igmp_version(struct net_bridge *br, unsigned long val);
679#if IS_ENABLED(CONFIG_IPV6)
680int br_multicast_set_mld_version(struct net_bridge *br, unsigned long val);
681#endif
682struct net_bridge_mdb_entry *
683br_mdb_ip_get(struct net_bridge *br, struct br_ip *dst);
684struct net_bridge_mdb_entry *
685br_multicast_new_group(struct net_bridge *br, struct br_ip *group);
686struct net_bridge_port_group *
687br_multicast_new_port_group(struct net_bridge_port *port, struct br_ip *group,
688 struct net_bridge_port_group __rcu *next,
689 unsigned char flags, const unsigned char *src);
690int br_mdb_hash_init(struct net_bridge *br);
691void br_mdb_hash_fini(struct net_bridge *br);
692void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port,
693 struct br_ip *group, int type, u8 flags);
694void br_rtr_notify(struct net_device *dev, struct net_bridge_port *port,
695 int type);
696void br_multicast_count(struct net_bridge *br, const struct net_bridge_port *p,
697 const struct sk_buff *skb, u8 type, u8 dir);
698int br_multicast_init_stats(struct net_bridge *br);
699void br_multicast_uninit_stats(struct net_bridge *br);
700void br_multicast_get_stats(const struct net_bridge *br,
701 const struct net_bridge_port *p,
702 struct br_mcast_stats *dest);
703void br_mdb_init(void);
704void br_mdb_uninit(void);
705void br_multicast_host_join(struct net_bridge_mdb_entry *mp, bool notify);
706void br_multicast_host_leave(struct net_bridge_mdb_entry *mp, bool notify);
707
708#define mlock_dereference(X, br) \
709 rcu_dereference_protected(X, lockdep_is_held(&br->multicast_lock))
710
711static inline bool br_multicast_is_router(struct net_bridge *br)
712{
713 return br->multicast_router == 2 ||
714 (br->multicast_router == 1 &&
715 timer_pending(&br->multicast_router_timer));
716}
717
718static inline bool
719__br_multicast_querier_exists(struct net_bridge *br,
720 struct bridge_mcast_other_query *querier,
721 const bool is_ipv6)
722{
723 bool own_querier_enabled;
724
725 if (br_opt_get(br, BROPT_MULTICAST_QUERIER)) {
726 if (is_ipv6 && !br_opt_get(br, BROPT_HAS_IPV6_ADDR))
727 own_querier_enabled = false;
728 else
729 own_querier_enabled = true;
730 } else {
731 own_querier_enabled = false;
732 }
733
734 return time_is_before_jiffies(querier->delay_time) &&
735 (own_querier_enabled || timer_pending(&querier->timer));
736}
737
738static inline bool br_multicast_querier_exists(struct net_bridge *br,
739 struct ethhdr *eth)
740{
741 switch (eth->h_proto) {
742 case (htons(ETH_P_IP)):
743 return __br_multicast_querier_exists(br,
744 &br->ip4_other_query, false);
745#if IS_ENABLED(CONFIG_IPV6)
746 case (htons(ETH_P_IPV6)):
747 return __br_multicast_querier_exists(br,
748 &br->ip6_other_query, true);
749#endif
750 default:
751 return false;
752 }
753}
754
755static inline int br_multicast_igmp_type(const struct sk_buff *skb)
756{
757 return BR_INPUT_SKB_CB(skb)->igmp;
758}
759#else
760static inline int br_multicast_rcv(struct net_bridge *br,
761 struct net_bridge_port *port,
762 struct sk_buff *skb,
763 u16 vid)
764{
765 return 0;
766}
767
768static inline struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
769 struct sk_buff *skb, u16 vid)
770{
771 return NULL;
772}
773
774static inline int br_multicast_add_port(struct net_bridge_port *port)
775{
776 return 0;
777}
778
779static inline void br_multicast_del_port(struct net_bridge_port *port)
780{
781}
782
783static inline void br_multicast_enable_port(struct net_bridge_port *port)
784{
785}
786
787static inline void br_multicast_disable_port(struct net_bridge_port *port)
788{
789}
790
791static inline void br_multicast_init(struct net_bridge *br)
792{
793}
794
795static inline void br_multicast_open(struct net_bridge *br)
796{
797}
798
799static inline void br_multicast_stop(struct net_bridge *br)
800{
801}
802
803static inline void br_multicast_dev_del(struct net_bridge *br)
804{
805}
806
807static inline void br_multicast_flood(struct net_bridge_mdb_entry *mdst,
808 struct sk_buff *skb,
809 bool local_rcv, bool local_orig)
810{
811}
812
813static inline bool br_multicast_is_router(struct net_bridge *br)
814{
815 return false;
816}
817
818static inline bool br_multicast_querier_exists(struct net_bridge *br,
819 struct ethhdr *eth)
820{
821 return false;
822}
823
824static inline void br_mdb_init(void)
825{
826}
827
828static inline void br_mdb_uninit(void)
829{
830}
831
832static inline int br_mdb_hash_init(struct net_bridge *br)
833{
834 return 0;
835}
836
837static inline void br_mdb_hash_fini(struct net_bridge *br)
838{
839}
840
841static inline void br_multicast_count(struct net_bridge *br,
842 const struct net_bridge_port *p,
843 const struct sk_buff *skb,
844 u8 type, u8 dir)
845{
846}
847
848static inline int br_multicast_init_stats(struct net_bridge *br)
849{
850 return 0;
851}
852
853static inline void br_multicast_uninit_stats(struct net_bridge *br)
854{
855}
856
857static inline int br_multicast_igmp_type(const struct sk_buff *skb)
858{
859 return 0;
860}
861#endif
862
863/* br_vlan.c */
864#ifdef CONFIG_BRIDGE_VLAN_FILTERING
865bool br_allowed_ingress(const struct net_bridge *br,
866 struct net_bridge_vlan_group *vg, struct sk_buff *skb,
867 u16 *vid);
868bool br_allowed_egress(struct net_bridge_vlan_group *vg,
869 const struct sk_buff *skb);
870bool br_should_learn(struct net_bridge_port *p, struct sk_buff *skb, u16 *vid);
871struct sk_buff *br_handle_vlan(struct net_bridge *br,
872 const struct net_bridge_port *port,
873 struct net_bridge_vlan_group *vg,
874 struct sk_buff *skb);
875int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags,
876 bool *changed, struct netlink_ext_ack *extack);
877int br_vlan_delete(struct net_bridge *br, u16 vid);
878void br_vlan_flush(struct net_bridge *br);
879struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg, u16 vid);
880void br_recalculate_fwd_mask(struct net_bridge *br);
881int __br_vlan_filter_toggle(struct net_bridge *br, unsigned long val);
882int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val);
883int __br_vlan_set_proto(struct net_bridge *br, __be16 proto);
884int br_vlan_set_proto(struct net_bridge *br, unsigned long val);
885int br_vlan_set_stats(struct net_bridge *br, unsigned long val);
886int br_vlan_set_stats_per_port(struct net_bridge *br, unsigned long val);
887int br_vlan_init(struct net_bridge *br);
888int br_vlan_set_default_pvid(struct net_bridge *br, unsigned long val);
889int __br_vlan_set_default_pvid(struct net_bridge *br, u16 pvid,
890 struct netlink_ext_ack *extack);
891int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags,
892 bool *changed, struct netlink_ext_ack *extack);
893int nbp_vlan_delete(struct net_bridge_port *port, u16 vid);
894void nbp_vlan_flush(struct net_bridge_port *port);
895int nbp_vlan_init(struct net_bridge_port *port, struct netlink_ext_ack *extack);
896int nbp_get_num_vlan_infos(struct net_bridge_port *p, u32 filter_mask);
897void br_vlan_get_stats(const struct net_bridge_vlan *v,
898 struct br_vlan_stats *stats);
899void br_vlan_port_event(struct net_bridge_port *p, unsigned long event);
900int br_vlan_bridge_event(struct net_device *dev, unsigned long event,
901 void *ptr);
902
903static inline struct net_bridge_vlan_group *br_vlan_group(
904 const struct net_bridge *br)
905{
906 return rtnl_dereference(br->vlgrp);
907}
908
909static inline struct net_bridge_vlan_group *nbp_vlan_group(
910 const struct net_bridge_port *p)
911{
912 return rtnl_dereference(p->vlgrp);
913}
914
915static inline struct net_bridge_vlan_group *br_vlan_group_rcu(
916 const struct net_bridge *br)
917{
918 return rcu_dereference(br->vlgrp);
919}
920
921static inline struct net_bridge_vlan_group *nbp_vlan_group_rcu(
922 const struct net_bridge_port *p)
923{
924 return rcu_dereference(p->vlgrp);
925}
926
927/* Since bridge now depends on 8021Q module, but the time bridge sees the
928 * skb, the vlan tag will always be present if the frame was tagged.
929 */
930static inline int br_vlan_get_tag(const struct sk_buff *skb, u16 *vid)
931{
932 int err = 0;
933
934 if (skb_vlan_tag_present(skb)) {
935 *vid = skb_vlan_tag_get_id(skb);
936 } else {
937 *vid = 0;
938 err = -EINVAL;
939 }
940
941 return err;
942}
943
944static inline u16 br_get_pvid(const struct net_bridge_vlan_group *vg)
945{
946 if (!vg)
947 return 0;
948
949 smp_rmb();
950 return vg->pvid;
951}
952
953#else
954static inline bool br_allowed_ingress(const struct net_bridge *br,
955 struct net_bridge_vlan_group *vg,
956 struct sk_buff *skb,
957 u16 *vid)
958{
959 return true;
960}
961
962static inline bool br_allowed_egress(struct net_bridge_vlan_group *vg,
963 const struct sk_buff *skb)
964{
965 return true;
966}
967
968static inline bool br_should_learn(struct net_bridge_port *p,
969 struct sk_buff *skb, u16 *vid)
970{
971 return true;
972}
973
974static inline struct sk_buff *br_handle_vlan(struct net_bridge *br,
975 const struct net_bridge_port *port,
976 struct net_bridge_vlan_group *vg,
977 struct sk_buff *skb)
978{
979 return skb;
980}
981
982static inline int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags,
983 bool *changed, struct netlink_ext_ack *extack)
984{
985 *changed = false;
986 return -EOPNOTSUPP;
987}
988
989static inline int br_vlan_delete(struct net_bridge *br, u16 vid)
990{
991 return -EOPNOTSUPP;
992}
993
994static inline void br_vlan_flush(struct net_bridge *br)
995{
996}
997
998static inline void br_recalculate_fwd_mask(struct net_bridge *br)
999{
1000}
1001
1002static inline int br_vlan_init(struct net_bridge *br)
1003{
1004 return 0;
1005}
1006
1007static inline int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags,
1008 bool *changed, struct netlink_ext_ack *extack)
1009{
1010 *changed = false;
1011 return -EOPNOTSUPP;
1012}
1013
1014static inline int nbp_vlan_delete(struct net_bridge_port *port, u16 vid)
1015{
1016 return -EOPNOTSUPP;
1017}
1018
1019static inline void nbp_vlan_flush(struct net_bridge_port *port)
1020{
1021}
1022
1023static inline struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg,
1024 u16 vid)
1025{
1026 return NULL;
1027}
1028
1029static inline int nbp_vlan_init(struct net_bridge_port *port,
1030 struct netlink_ext_ack *extack)
1031{
1032 return 0;
1033}
1034
1035static inline u16 br_vlan_get_tag(const struct sk_buff *skb, u16 *tag)
1036{
1037 return 0;
1038}
1039
1040static inline u16 br_get_pvid(const struct net_bridge_vlan_group *vg)
1041{
1042 return 0;
1043}
1044
1045static inline int __br_vlan_filter_toggle(struct net_bridge *br,
1046 unsigned long val)
1047{
1048 return -EOPNOTSUPP;
1049}
1050
1051static inline int nbp_get_num_vlan_infos(struct net_bridge_port *p,
1052 u32 filter_mask)
1053{
1054 return 0;
1055}
1056
1057static inline struct net_bridge_vlan_group *br_vlan_group(
1058 const struct net_bridge *br)
1059{
1060 return NULL;
1061}
1062
1063static inline struct net_bridge_vlan_group *nbp_vlan_group(
1064 const struct net_bridge_port *p)
1065{
1066 return NULL;
1067}
1068
1069static inline struct net_bridge_vlan_group *br_vlan_group_rcu(
1070 const struct net_bridge *br)
1071{
1072 return NULL;
1073}
1074
1075static inline struct net_bridge_vlan_group *nbp_vlan_group_rcu(
1076 const struct net_bridge_port *p)
1077{
1078 return NULL;
1079}
1080
1081static inline void br_vlan_get_stats(const struct net_bridge_vlan *v,
1082 struct br_vlan_stats *stats)
1083{
1084}
1085
1086static inline void br_vlan_port_event(struct net_bridge_port *p,
1087 unsigned long event)
1088{
1089}
1090
1091static inline int br_vlan_bridge_event(struct net_device *dev,
1092 unsigned long event, void *ptr)
1093{
1094 return 0;
1095}
1096#endif
1097
1098struct nf_br_ops {
1099 int (*br_dev_xmit_hook)(struct sk_buff *skb);
1100};
1101extern const struct nf_br_ops __rcu *nf_br_ops;
1102
1103/* br_netfilter.c */
1104#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
1105int br_nf_core_init(void);
1106void br_nf_core_fini(void);
1107void br_netfilter_rtable_init(struct net_bridge *);
1108#else
1109static inline int br_nf_core_init(void) { return 0; }
1110static inline void br_nf_core_fini(void) {}
1111#define br_netfilter_rtable_init(x)
1112#endif
1113
1114/* br_stp.c */
1115void br_set_state(struct net_bridge_port *p, unsigned int state);
1116struct net_bridge_port *br_get_port(struct net_bridge *br, u16 port_no);
1117void br_init_port(struct net_bridge_port *p);
1118void br_become_designated_port(struct net_bridge_port *p);
1119
1120void __br_set_forward_delay(struct net_bridge *br, unsigned long t);
1121int br_set_forward_delay(struct net_bridge *br, unsigned long x);
1122int br_set_hello_time(struct net_bridge *br, unsigned long x);
1123int br_set_max_age(struct net_bridge *br, unsigned long x);
1124int __set_ageing_time(struct net_device *dev, unsigned long t);
1125int br_set_ageing_time(struct net_bridge *br, clock_t ageing_time);
1126
1127
1128/* br_stp_if.c */
1129void br_stp_enable_bridge(struct net_bridge *br);
1130void br_stp_disable_bridge(struct net_bridge *br);
1131void br_stp_set_enabled(struct net_bridge *br, unsigned long val);
1132void br_stp_enable_port(struct net_bridge_port *p);
1133void br_stp_disable_port(struct net_bridge_port *p);
1134bool br_stp_recalculate_bridge_id(struct net_bridge *br);
1135void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *a);
1136void br_stp_set_bridge_priority(struct net_bridge *br, u16 newprio);
1137int br_stp_set_port_priority(struct net_bridge_port *p, unsigned long newprio);
1138int br_stp_set_path_cost(struct net_bridge_port *p, unsigned long path_cost);
1139ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id);
1140
1141/* br_stp_bpdu.c */
1142struct stp_proto;
1143void br_stp_rcv(const struct stp_proto *proto, struct sk_buff *skb,
1144 struct net_device *dev);
1145
1146/* br_stp_timer.c */
1147void br_stp_timer_init(struct net_bridge *br);
1148void br_stp_port_timer_init(struct net_bridge_port *p);
1149unsigned long br_timer_value(const struct timer_list *timer);
1150
1151/* br.c */
1152#if IS_ENABLED(CONFIG_ATM_LANE)
1153extern int (*br_fdb_test_addr_hook)(struct net_device *dev, unsigned char *addr);
1154#endif
1155
1156/* br_netlink.c */
1157extern struct rtnl_link_ops br_link_ops;
1158int br_netlink_init(void);
1159void br_netlink_fini(void);
1160void br_ifinfo_notify(int event, const struct net_bridge *br,
1161 const struct net_bridge_port *port);
1162int br_setlink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags,
1163 struct netlink_ext_ack *extack);
1164int br_dellink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags);
1165int br_getlink(struct sk_buff *skb, u32 pid, u32 seq, struct net_device *dev,
1166 u32 filter_mask, int nlflags);
1167
1168#ifdef CONFIG_SYSFS
1169/* br_sysfs_if.c */
1170extern const struct sysfs_ops brport_sysfs_ops;
1171int br_sysfs_addif(struct net_bridge_port *p);
1172int br_sysfs_renameif(struct net_bridge_port *p);
1173
1174/* br_sysfs_br.c */
1175int br_sysfs_addbr(struct net_device *dev);
1176void br_sysfs_delbr(struct net_device *dev);
1177
1178#else
1179
1180static inline int br_sysfs_addif(struct net_bridge_port *p) { return 0; }
1181static inline int br_sysfs_renameif(struct net_bridge_port *p) { return 0; }
1182static inline int br_sysfs_addbr(struct net_device *dev) { return 0; }
1183static inline void br_sysfs_delbr(struct net_device *dev) { return; }
1184#endif /* CONFIG_SYSFS */
1185
1186/* br_switchdev.c */
1187#ifdef CONFIG_NET_SWITCHDEV
1188int nbp_switchdev_mark_set(struct net_bridge_port *p);
1189void nbp_switchdev_frame_mark(const struct net_bridge_port *p,
1190 struct sk_buff *skb);
1191bool nbp_switchdev_allowed_egress(const struct net_bridge_port *p,
1192 const struct sk_buff *skb);
1193int br_switchdev_set_port_flag(struct net_bridge_port *p,
1194 unsigned long flags,
1195 unsigned long mask);
1196void br_switchdev_fdb_notify(const struct net_bridge_fdb_entry *fdb,
1197 int type);
1198int br_switchdev_port_vlan_add(struct net_device *dev, u16 vid, u16 flags,
1199 struct netlink_ext_ack *extack);
1200int br_switchdev_port_vlan_del(struct net_device *dev, u16 vid);
1201
1202static inline void br_switchdev_frame_unmark(struct sk_buff *skb)
1203{
1204 skb->offload_fwd_mark = 0;
1205}
1206#else
1207static inline int nbp_switchdev_mark_set(struct net_bridge_port *p)
1208{
1209 return 0;
1210}
1211
1212static inline void nbp_switchdev_frame_mark(const struct net_bridge_port *p,
1213 struct sk_buff *skb)
1214{
1215}
1216
1217static inline bool nbp_switchdev_allowed_egress(const struct net_bridge_port *p,
1218 const struct sk_buff *skb)
1219{
1220 return true;
1221}
1222
1223static inline int br_switchdev_set_port_flag(struct net_bridge_port *p,
1224 unsigned long flags,
1225 unsigned long mask)
1226{
1227 return 0;
1228}
1229
1230static inline int br_switchdev_port_vlan_add(struct net_device *dev,
1231 u16 vid, u16 flags,
1232 struct netlink_ext_ack *extack)
1233{
1234 return -EOPNOTSUPP;
1235}
1236
1237static inline int br_switchdev_port_vlan_del(struct net_device *dev, u16 vid)
1238{
1239 return -EOPNOTSUPP;
1240}
1241
1242static inline void
1243br_switchdev_fdb_notify(const struct net_bridge_fdb_entry *fdb, int type)
1244{
1245}
1246
1247static inline void br_switchdev_frame_unmark(struct sk_buff *skb)
1248{
1249}
1250#endif /* CONFIG_NET_SWITCHDEV */
1251
1252/* br_arp_nd_proxy.c */
1253void br_recalculate_neigh_suppress_enabled(struct net_bridge *br);
1254void br_do_proxy_suppress_arp(struct sk_buff *skb, struct net_bridge *br,
1255 u16 vid, struct net_bridge_port *p);
1256void br_do_suppress_nd(struct sk_buff *skb, struct net_bridge *br,
1257 u16 vid, struct net_bridge_port *p, struct nd_msg *msg);
1258struct nd_msg *br_is_nd_neigh_msg(struct sk_buff *skb, struct nd_msg *m);
1259#endif
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);
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)
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