tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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 unsigned char state;
87};
88
89struct net_bridge_mdb_entry
90{
91 struct hlist_node hlist[2];
92 struct net_bridge *br;
93 struct net_bridge_port_group __rcu *ports;
94 struct rcu_head rcu;
95 struct timer_list timer;
96 struct br_ip addr;
97 bool mglist;
98};
99
100struct net_bridge_mdb_htable
101{
102 struct hlist_head *mhash;
103 struct rcu_head rcu;
104 struct net_bridge_mdb_htable *old;
105 u32 size;
106 u32 max;
107 u32 secret;
108 u32 ver;
109};
110
111struct net_bridge_port
112{
113 struct net_bridge *br;
114 struct net_device *dev;
115 struct list_head list;
116
117 /* STP */
118 u8 priority;
119 u8 state;
120 u16 port_no;
121 unsigned char topology_change_ack;
122 unsigned char config_pending;
123 port_id port_id;
124 port_id designated_port;
125 bridge_id designated_root;
126 bridge_id designated_bridge;
127 u32 path_cost;
128 u32 designated_cost;
129 unsigned long designated_age;
130
131 struct timer_list forward_delay_timer;
132 struct timer_list hold_timer;
133 struct timer_list message_age_timer;
134 struct kobject kobj;
135 struct rcu_head rcu;
136
137 unsigned long flags;
138#define BR_HAIRPIN_MODE 0x00000001
139#define BR_BPDU_GUARD 0x00000002
140#define BR_ROOT_BLOCK 0x00000004
141#define BR_MULTICAST_FAST_LEAVE 0x00000008
142
143#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
144 u32 multicast_startup_queries_sent;
145 unsigned char multicast_router;
146 struct timer_list multicast_router_timer;
147 struct timer_list multicast_query_timer;
148 struct hlist_head mglist;
149 struct hlist_node rlist;
150#endif
151
152#ifdef CONFIG_SYSFS
153 char sysfs_name[IFNAMSIZ];
154#endif
155
156#ifdef CONFIG_NET_POLL_CONTROLLER
157 struct netpoll *np;
158#endif
159};
160
161#define br_port_exists(dev) (dev->priv_flags & IFF_BRIDGE_PORT)
162
163static inline struct net_bridge_port *br_port_get_rcu(const struct net_device *dev)
164{
165 struct net_bridge_port *port =
166 rcu_dereference_rtnl(dev->rx_handler_data);
167
168 return br_port_exists(dev) ? port : NULL;
169}
170
171static inline struct net_bridge_port *br_port_get_rtnl(struct net_device *dev)
172{
173 return br_port_exists(dev) ?
174 rtnl_dereference(dev->rx_handler_data) : NULL;
175}
176
177struct br_cpu_netstats {
178 u64 rx_packets;
179 u64 rx_bytes;
180 u64 tx_packets;
181 u64 tx_bytes;
182 struct u64_stats_sync syncp;
183};
184
185struct net_bridge
186{
187 spinlock_t lock;
188 struct list_head port_list;
189 struct net_device *dev;
190
191 struct br_cpu_netstats __percpu *stats;
192 spinlock_t hash_lock;
193 struct hlist_head hash[BR_HASH_SIZE];
194#ifdef CONFIG_BRIDGE_NETFILTER
195 struct rtable fake_rtable;
196 bool nf_call_iptables;
197 bool nf_call_ip6tables;
198 bool nf_call_arptables;
199#endif
200 unsigned long flags;
201#define BR_SET_MAC_ADDR 0x00000001
202
203 u16 group_fwd_mask;
204
205 /* STP */
206 bridge_id designated_root;
207 bridge_id bridge_id;
208 u32 root_path_cost;
209 unsigned long max_age;
210 unsigned long hello_time;
211 unsigned long forward_delay;
212 unsigned long bridge_max_age;
213 unsigned long ageing_time;
214 unsigned long bridge_hello_time;
215 unsigned long bridge_forward_delay;
216
217 u8 group_addr[ETH_ALEN];
218 u16 root_port;
219
220 enum {
221 BR_NO_STP, /* no spanning tree */
222 BR_KERNEL_STP, /* old STP in kernel */
223 BR_USER_STP, /* new RSTP in userspace */
224 } stp_enabled;
225
226 unsigned char topology_change;
227 unsigned char topology_change_detected;
228
229#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
230 unsigned char multicast_router;
231
232 u8 multicast_disabled:1;
233 u8 multicast_querier:1;
234
235 u32 hash_elasticity;
236 u32 hash_max;
237
238 u32 multicast_last_member_count;
239 u32 multicast_startup_queries_sent;
240 u32 multicast_startup_query_count;
241
242 unsigned long multicast_last_member_interval;
243 unsigned long multicast_membership_interval;
244 unsigned long multicast_querier_interval;
245 unsigned long multicast_query_interval;
246 unsigned long multicast_query_response_interval;
247 unsigned long multicast_startup_query_interval;
248
249 spinlock_t multicast_lock;
250 struct net_bridge_mdb_htable __rcu *mdb;
251 struct hlist_head router_list;
252
253 struct timer_list multicast_router_timer;
254 struct timer_list multicast_querier_timer;
255 struct timer_list multicast_query_timer;
256#endif
257
258 struct timer_list hello_timer;
259 struct timer_list tcn_timer;
260 struct timer_list topology_change_timer;
261 struct timer_list gc_timer;
262 struct kobject *ifobj;
263};
264
265struct br_input_skb_cb {
266 struct net_device *brdev;
267#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
268 int igmp;
269 int mrouters_only;
270#endif
271};
272
273#define BR_INPUT_SKB_CB(__skb) ((struct br_input_skb_cb *)(__skb)->cb)
274
275#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
276# define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb) (BR_INPUT_SKB_CB(__skb)->mrouters_only)
277#else
278# define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb) (0)
279#endif
280
281#define br_printk(level, br, format, args...) \
282 printk(level "%s: " format, (br)->dev->name, ##args)
283
284#define br_err(__br, format, args...) \
285 br_printk(KERN_ERR, __br, format, ##args)
286#define br_warn(__br, format, args...) \
287 br_printk(KERN_WARNING, __br, format, ##args)
288#define br_notice(__br, format, args...) \
289 br_printk(KERN_NOTICE, __br, format, ##args)
290#define br_info(__br, format, args...) \
291 br_printk(KERN_INFO, __br, format, ##args)
292
293#define br_debug(br, format, args...) \
294 pr_debug("%s: " format, (br)->dev->name, ##args)
295
296extern struct notifier_block br_device_notifier;
297
298/* called under bridge lock */
299static inline int br_is_root_bridge(const struct net_bridge *br)
300{
301 return !memcmp(&br->bridge_id, &br->designated_root, 8);
302}
303
304/* br_device.c */
305extern void br_dev_setup(struct net_device *dev);
306extern void br_dev_delete(struct net_device *dev, struct list_head *list);
307extern netdev_tx_t br_dev_xmit(struct sk_buff *skb,
308 struct net_device *dev);
309#ifdef CONFIG_NET_POLL_CONTROLLER
310static inline struct netpoll_info *br_netpoll_info(struct net_bridge *br)
311{
312 return br->dev->npinfo;
313}
314
315static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
316 struct sk_buff *skb)
317{
318 struct netpoll *np = p->np;
319
320 if (np)
321 netpoll_send_skb(np, skb);
322}
323
324extern int br_netpoll_enable(struct net_bridge_port *p, gfp_t gfp);
325extern void br_netpoll_disable(struct net_bridge_port *p);
326#else
327static inline struct netpoll_info *br_netpoll_info(struct net_bridge *br)
328{
329 return NULL;
330}
331
332static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
333 struct sk_buff *skb)
334{
335}
336
337static inline int br_netpoll_enable(struct net_bridge_port *p, gfp_t gfp)
338{
339 return 0;
340}
341
342static inline void br_netpoll_disable(struct net_bridge_port *p)
343{
344}
345#endif
346
347/* br_fdb.c */
348extern int br_fdb_init(void);
349extern void br_fdb_fini(void);
350extern void br_fdb_flush(struct net_bridge *br);
351extern void br_fdb_changeaddr(struct net_bridge_port *p,
352 const unsigned char *newaddr);
353extern void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr);
354extern void br_fdb_cleanup(unsigned long arg);
355extern void br_fdb_delete_by_port(struct net_bridge *br,
356 const struct net_bridge_port *p, int do_all);
357extern struct net_bridge_fdb_entry *__br_fdb_get(struct net_bridge *br,
358 const unsigned char *addr);
359extern int br_fdb_test_addr(struct net_device *dev, unsigned char *addr);
360extern int br_fdb_fillbuf(struct net_bridge *br, void *buf,
361 unsigned long count, unsigned long off);
362extern int br_fdb_insert(struct net_bridge *br,
363 struct net_bridge_port *source,
364 const unsigned char *addr);
365extern void br_fdb_update(struct net_bridge *br,
366 struct net_bridge_port *source,
367 const unsigned char *addr);
368
369extern int br_fdb_delete(struct ndmsg *ndm,
370 struct net_device *dev,
371 const unsigned char *addr);
372extern int br_fdb_add(struct ndmsg *nlh, struct nlattr *tb[],
373 struct net_device *dev,
374 const unsigned char *addr,
375 u16 nlh_flags);
376extern int br_fdb_dump(struct sk_buff *skb,
377 struct netlink_callback *cb,
378 struct net_device *dev,
379 int idx);
380
381/* br_forward.c */
382extern void br_deliver(const struct net_bridge_port *to,
383 struct sk_buff *skb);
384extern int br_dev_queue_push_xmit(struct sk_buff *skb);
385extern void br_forward(const struct net_bridge_port *to,
386 struct sk_buff *skb, struct sk_buff *skb0);
387extern int br_forward_finish(struct sk_buff *skb);
388extern void br_flood_deliver(struct net_bridge *br, struct sk_buff *skb);
389extern void br_flood_forward(struct net_bridge *br, struct sk_buff *skb,
390 struct sk_buff *skb2);
391
392/* br_if.c */
393extern void br_port_carrier_check(struct net_bridge_port *p);
394extern int br_add_bridge(struct net *net, const char *name);
395extern int br_del_bridge(struct net *net, const char *name);
396extern void br_net_exit(struct net *net);
397extern int br_add_if(struct net_bridge *br,
398 struct net_device *dev);
399extern int br_del_if(struct net_bridge *br,
400 struct net_device *dev);
401extern int br_min_mtu(const struct net_bridge *br);
402extern netdev_features_t br_features_recompute(struct net_bridge *br,
403 netdev_features_t features);
404
405/* br_input.c */
406extern int br_handle_frame_finish(struct sk_buff *skb);
407extern rx_handler_result_t br_handle_frame(struct sk_buff **pskb);
408
409/* br_ioctl.c */
410extern int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
411extern int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd, void __user *arg);
412
413/* br_multicast.c */
414#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
415extern unsigned int br_mdb_rehash_seq;
416extern int br_multicast_rcv(struct net_bridge *br,
417 struct net_bridge_port *port,
418 struct sk_buff *skb);
419extern struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
420 struct sk_buff *skb);
421extern void br_multicast_add_port(struct net_bridge_port *port);
422extern void br_multicast_del_port(struct net_bridge_port *port);
423extern void br_multicast_enable_port(struct net_bridge_port *port);
424extern void br_multicast_disable_port(struct net_bridge_port *port);
425extern void br_multicast_init(struct net_bridge *br);
426extern void br_multicast_open(struct net_bridge *br);
427extern void br_multicast_stop(struct net_bridge *br);
428extern void br_multicast_deliver(struct net_bridge_mdb_entry *mdst,
429 struct sk_buff *skb);
430extern void br_multicast_forward(struct net_bridge_mdb_entry *mdst,
431 struct sk_buff *skb, struct sk_buff *skb2);
432extern int br_multicast_set_router(struct net_bridge *br, unsigned long val);
433extern int br_multicast_set_port_router(struct net_bridge_port *p,
434 unsigned long val);
435extern int br_multicast_toggle(struct net_bridge *br, unsigned long val);
436extern int br_multicast_set_querier(struct net_bridge *br, unsigned long val);
437extern int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val);
438extern struct net_bridge_mdb_entry *br_mdb_ip_get(
439 struct net_bridge_mdb_htable *mdb,
440 struct br_ip *dst);
441extern struct net_bridge_mdb_entry *br_multicast_new_group(struct net_bridge *br,
442 struct net_bridge_port *port, struct br_ip *group);
443extern void br_multicast_free_pg(struct rcu_head *head);
444extern struct net_bridge_port_group *br_multicast_new_port_group(
445 struct net_bridge_port *port,
446 struct br_ip *group,
447 struct net_bridge_port_group *next,
448 unsigned char state);
449extern void br_mdb_init(void);
450extern void br_mdb_uninit(void);
451extern void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port,
452 struct br_ip *group, int type);
453
454#define mlock_dereference(X, br) \
455 rcu_dereference_protected(X, lockdep_is_held(&br->multicast_lock))
456
457#if IS_ENABLED(CONFIG_IPV6)
458#include <net/addrconf.h>
459static inline int ipv6_is_transient_multicast(const struct in6_addr *addr)
460{
461 if (ipv6_addr_is_multicast(addr) && IPV6_ADDR_MC_FLAG_TRANSIENT(addr))
462 return 1;
463 return 0;
464}
465#endif
466
467static inline bool br_multicast_is_router(struct net_bridge *br)
468{
469 return br->multicast_router == 2 ||
470 (br->multicast_router == 1 &&
471 timer_pending(&br->multicast_router_timer));
472}
473#else
474static inline int br_multicast_rcv(struct net_bridge *br,
475 struct net_bridge_port *port,
476 struct sk_buff *skb)
477{
478 return 0;
479}
480
481static inline struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
482 struct sk_buff *skb)
483{
484 return NULL;
485}
486
487static inline void br_multicast_add_port(struct net_bridge_port *port)
488{
489}
490
491static inline void br_multicast_del_port(struct net_bridge_port *port)
492{
493}
494
495static inline void br_multicast_enable_port(struct net_bridge_port *port)
496{
497}
498
499static inline void br_multicast_disable_port(struct net_bridge_port *port)
500{
501}
502
503static inline void br_multicast_init(struct net_bridge *br)
504{
505}
506
507static inline void br_multicast_open(struct net_bridge *br)
508{
509}
510
511static inline void br_multicast_stop(struct net_bridge *br)
512{
513}
514
515static inline void br_multicast_deliver(struct net_bridge_mdb_entry *mdst,
516 struct sk_buff *skb)
517{
518}
519
520static inline void br_multicast_forward(struct net_bridge_mdb_entry *mdst,
521 struct sk_buff *skb,
522 struct sk_buff *skb2)
523{
524}
525static inline bool br_multicast_is_router(struct net_bridge *br)
526{
527 return 0;
528}
529#endif
530
531/* br_netfilter.c */
532#ifdef CONFIG_BRIDGE_NETFILTER
533extern int br_netfilter_init(void);
534extern void br_netfilter_fini(void);
535extern void br_netfilter_rtable_init(struct net_bridge *);
536#else
537#define br_netfilter_init() (0)
538#define br_netfilter_fini() do { } while(0)
539#define br_netfilter_rtable_init(x)
540#endif
541
542/* br_stp.c */
543extern void br_log_state(const struct net_bridge_port *p);
544extern struct net_bridge_port *br_get_port(struct net_bridge *br,
545 u16 port_no);
546extern void br_init_port(struct net_bridge_port *p);
547extern void br_become_designated_port(struct net_bridge_port *p);
548
549extern int br_set_forward_delay(struct net_bridge *br, unsigned long x);
550extern int br_set_hello_time(struct net_bridge *br, unsigned long x);
551extern int br_set_max_age(struct net_bridge *br, unsigned long x);
552
553
554/* br_stp_if.c */
555extern void br_stp_enable_bridge(struct net_bridge *br);
556extern void br_stp_disable_bridge(struct net_bridge *br);
557extern void br_stp_set_enabled(struct net_bridge *br, unsigned long val);
558extern void br_stp_enable_port(struct net_bridge_port *p);
559extern void br_stp_disable_port(struct net_bridge_port *p);
560extern bool br_stp_recalculate_bridge_id(struct net_bridge *br);
561extern void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *a);
562extern void br_stp_set_bridge_priority(struct net_bridge *br,
563 u16 newprio);
564extern int br_stp_set_port_priority(struct net_bridge_port *p,
565 unsigned long newprio);
566extern int br_stp_set_path_cost(struct net_bridge_port *p,
567 unsigned long path_cost);
568extern ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id);
569
570/* br_stp_bpdu.c */
571struct stp_proto;
572extern void br_stp_rcv(const struct stp_proto *proto, struct sk_buff *skb,
573 struct net_device *dev);
574
575/* br_stp_timer.c */
576extern void br_stp_timer_init(struct net_bridge *br);
577extern void br_stp_port_timer_init(struct net_bridge_port *p);
578extern unsigned long br_timer_value(const struct timer_list *timer);
579
580/* br.c */
581#if IS_ENABLED(CONFIG_ATM_LANE)
582extern int (*br_fdb_test_addr_hook)(struct net_device *dev, unsigned char *addr);
583#endif
584
585/* br_netlink.c */
586extern struct rtnl_link_ops br_link_ops;
587extern int br_netlink_init(void);
588extern void br_netlink_fini(void);
589extern void br_ifinfo_notify(int event, struct net_bridge_port *port);
590extern int br_setlink(struct net_device *dev, struct nlmsghdr *nlmsg);
591extern int br_getlink(struct sk_buff *skb, u32 pid, u32 seq,
592 struct net_device *dev);
593
594#ifdef CONFIG_SYSFS
595/* br_sysfs_if.c */
596extern const struct sysfs_ops brport_sysfs_ops;
597extern int br_sysfs_addif(struct net_bridge_port *p);
598extern int br_sysfs_renameif(struct net_bridge_port *p);
599
600/* br_sysfs_br.c */
601extern int br_sysfs_addbr(struct net_device *dev);
602extern void br_sysfs_delbr(struct net_device *dev);
603
604#else
605
606static inline int br_sysfs_addif(struct net_bridge_port *p) { return 0; }
607static inline int br_sysfs_renameif(struct net_bridge_port *p) { return 0; }
608static inline int br_sysfs_addbr(struct net_device *dev) { return 0; }
609static inline void br_sysfs_delbr(struct net_device *dev) { return; }
610#endif /* CONFIG_SYSFS */
611
612#endif