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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 | /* Path to usermode spanning tree program */ |
33 | #define BR_STP_PROG "/sbin/bridge-stp" |
34 | |
35 | typedef struct bridge_id bridge_id; |
36 | typedef struct mac_addr mac_addr; |
37 | typedef __u16 port_id; |
38 | |
39 | struct bridge_id |
40 | { |
41 | unsigned char prio[2]; |
42 | unsigned char addr[6]; |
43 | }; |
44 | |
45 | struct mac_addr |
46 | { |
47 | unsigned char addr[6]; |
48 | }; |
49 | |
50 | struct br_ip |
51 | { |
52 | union { |
53 | __be32 ip4; |
54 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
55 | struct in6_addr ip6; |
56 | #endif |
57 | } u; |
58 | __be16 proto; |
59 | }; |
60 | |
61 | struct net_bridge_fdb_entry |
62 | { |
63 | struct hlist_node hlist; |
64 | struct net_bridge_port *dst; |
65 | |
66 | struct rcu_head rcu; |
67 | unsigned long ageing_timer; |
68 | mac_addr addr; |
69 | unsigned char is_local; |
70 | unsigned char is_static; |
71 | }; |
72 | |
73 | struct net_bridge_port_group { |
74 | struct net_bridge_port *port; |
75 | struct net_bridge_port_group __rcu *next; |
76 | struct hlist_node mglist; |
77 | struct rcu_head rcu; |
78 | struct timer_list timer; |
79 | struct timer_list query_timer; |
80 | struct br_ip addr; |
81 | u32 queries_sent; |
82 | }; |
83 | |
84 | struct net_bridge_mdb_entry |
85 | { |
86 | struct hlist_node hlist[2]; |
87 | struct net_bridge *br; |
88 | struct net_bridge_port_group __rcu *ports; |
89 | struct rcu_head rcu; |
90 | struct timer_list timer; |
91 | struct timer_list query_timer; |
92 | struct br_ip addr; |
93 | bool mglist; |
94 | u32 queries_sent; |
95 | }; |
96 | |
97 | struct net_bridge_mdb_htable |
98 | { |
99 | struct hlist_head *mhash; |
100 | struct rcu_head rcu; |
101 | struct net_bridge_mdb_htable *old; |
102 | u32 size; |
103 | u32 max; |
104 | u32 secret; |
105 | u32 ver; |
106 | }; |
107 | |
108 | struct net_bridge_port |
109 | { |
110 | struct net_bridge *br; |
111 | struct net_device *dev; |
112 | struct list_head list; |
113 | |
114 | /* STP */ |
115 | u8 priority; |
116 | u8 state; |
117 | u16 port_no; |
118 | unsigned char topology_change_ack; |
119 | unsigned char config_pending; |
120 | port_id port_id; |
121 | port_id designated_port; |
122 | bridge_id designated_root; |
123 | bridge_id designated_bridge; |
124 | u32 path_cost; |
125 | u32 designated_cost; |
126 | |
127 | struct timer_list forward_delay_timer; |
128 | struct timer_list hold_timer; |
129 | struct timer_list message_age_timer; |
130 | struct kobject kobj; |
131 | struct rcu_head rcu; |
132 | |
133 | unsigned long flags; |
134 | #define BR_HAIRPIN_MODE 0x00000001 |
135 | |
136 | #ifdef CONFIG_BRIDGE_IGMP_SNOOPING |
137 | u32 multicast_startup_queries_sent; |
138 | unsigned char multicast_router; |
139 | struct timer_list multicast_router_timer; |
140 | struct timer_list multicast_query_timer; |
141 | struct hlist_head mglist; |
142 | struct hlist_node rlist; |
143 | #endif |
144 | |
145 | #ifdef CONFIG_SYSFS |
146 | char sysfs_name[IFNAMSIZ]; |
147 | #endif |
148 | |
149 | #ifdef CONFIG_NET_POLL_CONTROLLER |
150 | struct netpoll *np; |
151 | #endif |
152 | }; |
153 | |
154 | #define br_port_exists(dev) (dev->priv_flags & IFF_BRIDGE_PORT) |
155 | |
156 | static inline struct net_bridge_port *br_port_get_rcu(const struct net_device *dev) |
157 | { |
158 | struct net_bridge_port *port = rcu_dereference(dev->rx_handler_data); |
159 | return br_port_exists(dev) ? port : NULL; |
160 | } |
161 | |
162 | static inline struct net_bridge_port *br_port_get_rtnl(struct net_device *dev) |
163 | { |
164 | return br_port_exists(dev) ? |
165 | rtnl_dereference(dev->rx_handler_data) : NULL; |
166 | } |
167 | |
168 | struct br_cpu_netstats { |
169 | u64 rx_packets; |
170 | u64 rx_bytes; |
171 | u64 tx_packets; |
172 | u64 tx_bytes; |
173 | struct u64_stats_sync syncp; |
174 | }; |
175 | |
176 | struct net_bridge |
177 | { |
178 | spinlock_t lock; |
179 | struct list_head port_list; |
180 | struct net_device *dev; |
181 | |
182 | struct br_cpu_netstats __percpu *stats; |
183 | spinlock_t hash_lock; |
184 | struct hlist_head hash[BR_HASH_SIZE]; |
185 | u32 feature_mask; |
186 | #ifdef CONFIG_BRIDGE_NETFILTER |
187 | struct rtable fake_rtable; |
188 | bool nf_call_iptables; |
189 | bool nf_call_ip6tables; |
190 | bool nf_call_arptables; |
191 | #endif |
192 | unsigned long flags; |
193 | #define BR_SET_MAC_ADDR 0x00000001 |
194 | |
195 | /* STP */ |
196 | bridge_id designated_root; |
197 | bridge_id bridge_id; |
198 | u32 root_path_cost; |
199 | unsigned long max_age; |
200 | unsigned long hello_time; |
201 | unsigned long forward_delay; |
202 | unsigned long bridge_max_age; |
203 | unsigned long ageing_time; |
204 | unsigned long bridge_hello_time; |
205 | unsigned long bridge_forward_delay; |
206 | |
207 | u8 group_addr[ETH_ALEN]; |
208 | u16 root_port; |
209 | |
210 | enum { |
211 | BR_NO_STP, /* no spanning tree */ |
212 | BR_KERNEL_STP, /* old STP in kernel */ |
213 | BR_USER_STP, /* new RSTP in userspace */ |
214 | } stp_enabled; |
215 | |
216 | unsigned char topology_change; |
217 | unsigned char topology_change_detected; |
218 | |
219 | #ifdef CONFIG_BRIDGE_IGMP_SNOOPING |
220 | unsigned char multicast_router; |
221 | |
222 | u8 multicast_disabled:1; |
223 | |
224 | u32 hash_elasticity; |
225 | u32 hash_max; |
226 | |
227 | u32 multicast_last_member_count; |
228 | u32 multicast_startup_queries_sent; |
229 | u32 multicast_startup_query_count; |
230 | |
231 | unsigned long multicast_last_member_interval; |
232 | unsigned long multicast_membership_interval; |
233 | unsigned long multicast_querier_interval; |
234 | unsigned long multicast_query_interval; |
235 | unsigned long multicast_query_response_interval; |
236 | unsigned long multicast_startup_query_interval; |
237 | |
238 | spinlock_t multicast_lock; |
239 | struct net_bridge_mdb_htable __rcu *mdb; |
240 | struct hlist_head router_list; |
241 | |
242 | struct timer_list multicast_router_timer; |
243 | struct timer_list multicast_querier_timer; |
244 | struct timer_list multicast_query_timer; |
245 | #endif |
246 | |
247 | struct timer_list hello_timer; |
248 | struct timer_list tcn_timer; |
249 | struct timer_list topology_change_timer; |
250 | struct timer_list gc_timer; |
251 | struct kobject *ifobj; |
252 | }; |
253 | |
254 | struct br_input_skb_cb { |
255 | struct net_device *brdev; |
256 | #ifdef CONFIG_BRIDGE_IGMP_SNOOPING |
257 | int igmp; |
258 | int mrouters_only; |
259 | #endif |
260 | }; |
261 | |
262 | #define BR_INPUT_SKB_CB(__skb) ((struct br_input_skb_cb *)(__skb)->cb) |
263 | |
264 | #ifdef CONFIG_BRIDGE_IGMP_SNOOPING |
265 | # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb) (BR_INPUT_SKB_CB(__skb)->mrouters_only) |
266 | #else |
267 | # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb) (0) |
268 | #endif |
269 | |
270 | #define br_printk(level, br, format, args...) \ |
271 | printk(level "%s: " format, (br)->dev->name, ##args) |
272 | |
273 | #define br_err(__br, format, args...) \ |
274 | br_printk(KERN_ERR, __br, format, ##args) |
275 | #define br_warn(__br, format, args...) \ |
276 | br_printk(KERN_WARNING, __br, format, ##args) |
277 | #define br_notice(__br, format, args...) \ |
278 | br_printk(KERN_NOTICE, __br, format, ##args) |
279 | #define br_info(__br, format, args...) \ |
280 | br_printk(KERN_INFO, __br, format, ##args) |
281 | |
282 | #define br_debug(br, format, args...) \ |
283 | pr_debug("%s: " format, (br)->dev->name, ##args) |
284 | |
285 | extern struct notifier_block br_device_notifier; |
286 | extern const u8 br_group_address[ETH_ALEN]; |
287 | |
288 | /* called under bridge lock */ |
289 | static inline int br_is_root_bridge(const struct net_bridge *br) |
290 | { |
291 | return !memcmp(&br->bridge_id, &br->designated_root, 8); |
292 | } |
293 | |
294 | /* br_device.c */ |
295 | extern void br_dev_setup(struct net_device *dev); |
296 | extern netdev_tx_t br_dev_xmit(struct sk_buff *skb, |
297 | struct net_device *dev); |
298 | #ifdef CONFIG_NET_POLL_CONTROLLER |
299 | static inline struct netpoll_info *br_netpoll_info(struct net_bridge *br) |
300 | { |
301 | return br->dev->npinfo; |
302 | } |
303 | |
304 | static inline void br_netpoll_send_skb(const struct net_bridge_port *p, |
305 | struct sk_buff *skb) |
306 | { |
307 | struct netpoll *np = p->np; |
308 | |
309 | if (np) |
310 | netpoll_send_skb(np, skb); |
311 | } |
312 | |
313 | extern int br_netpoll_enable(struct net_bridge_port *p); |
314 | extern void br_netpoll_disable(struct net_bridge_port *p); |
315 | #else |
316 | static inline struct netpoll_info *br_netpoll_info(struct net_bridge *br) |
317 | { |
318 | return NULL; |
319 | } |
320 | |
321 | static inline void br_netpoll_send_skb(const struct net_bridge_port *p, |
322 | struct sk_buff *skb) |
323 | { |
324 | } |
325 | |
326 | static inline int br_netpoll_enable(struct net_bridge_port *p) |
327 | { |
328 | return 0; |
329 | } |
330 | |
331 | static inline void br_netpoll_disable(struct net_bridge_port *p) |
332 | { |
333 | } |
334 | #endif |
335 | |
336 | /* br_fdb.c */ |
337 | extern int br_fdb_init(void); |
338 | extern void br_fdb_fini(void); |
339 | extern void br_fdb_flush(struct net_bridge *br); |
340 | extern void br_fdb_changeaddr(struct net_bridge_port *p, |
341 | const unsigned char *newaddr); |
342 | extern void br_fdb_cleanup(unsigned long arg); |
343 | extern void br_fdb_delete_by_port(struct net_bridge *br, |
344 | const struct net_bridge_port *p, int do_all); |
345 | extern struct net_bridge_fdb_entry *__br_fdb_get(struct net_bridge *br, |
346 | const unsigned char *addr); |
347 | extern int br_fdb_test_addr(struct net_device *dev, unsigned char *addr); |
348 | extern int br_fdb_fillbuf(struct net_bridge *br, void *buf, |
349 | unsigned long count, unsigned long off); |
350 | extern int br_fdb_insert(struct net_bridge *br, |
351 | struct net_bridge_port *source, |
352 | const unsigned char *addr); |
353 | extern void br_fdb_update(struct net_bridge *br, |
354 | struct net_bridge_port *source, |
355 | const unsigned char *addr); |
356 | |
357 | /* br_forward.c */ |
358 | extern void br_deliver(const struct net_bridge_port *to, |
359 | struct sk_buff *skb); |
360 | extern int br_dev_queue_push_xmit(struct sk_buff *skb); |
361 | extern void br_forward(const struct net_bridge_port *to, |
362 | struct sk_buff *skb, struct sk_buff *skb0); |
363 | extern int br_forward_finish(struct sk_buff *skb); |
364 | extern void br_flood_deliver(struct net_bridge *br, struct sk_buff *skb); |
365 | extern void br_flood_forward(struct net_bridge *br, struct sk_buff *skb, |
366 | struct sk_buff *skb2); |
367 | |
368 | /* br_if.c */ |
369 | extern void br_port_carrier_check(struct net_bridge_port *p); |
370 | extern int br_add_bridge(struct net *net, const char *name); |
371 | extern int br_del_bridge(struct net *net, const char *name); |
372 | extern void br_net_exit(struct net *net); |
373 | extern int br_add_if(struct net_bridge *br, |
374 | struct net_device *dev); |
375 | extern int br_del_if(struct net_bridge *br, |
376 | struct net_device *dev); |
377 | extern int br_min_mtu(const struct net_bridge *br); |
378 | extern void br_features_recompute(struct net_bridge *br); |
379 | |
380 | /* br_input.c */ |
381 | extern int br_handle_frame_finish(struct sk_buff *skb); |
382 | extern rx_handler_result_t br_handle_frame(struct sk_buff **pskb); |
383 | |
384 | /* br_ioctl.c */ |
385 | extern int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd); |
386 | extern int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd, void __user *arg); |
387 | |
388 | /* br_multicast.c */ |
389 | #ifdef CONFIG_BRIDGE_IGMP_SNOOPING |
390 | extern int br_multicast_rcv(struct net_bridge *br, |
391 | struct net_bridge_port *port, |
392 | struct sk_buff *skb); |
393 | extern struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br, |
394 | struct sk_buff *skb); |
395 | extern void br_multicast_add_port(struct net_bridge_port *port); |
396 | extern void br_multicast_del_port(struct net_bridge_port *port); |
397 | extern void br_multicast_enable_port(struct net_bridge_port *port); |
398 | extern void br_multicast_disable_port(struct net_bridge_port *port); |
399 | extern void br_multicast_init(struct net_bridge *br); |
400 | extern void br_multicast_open(struct net_bridge *br); |
401 | extern void br_multicast_stop(struct net_bridge *br); |
402 | extern void br_multicast_deliver(struct net_bridge_mdb_entry *mdst, |
403 | struct sk_buff *skb); |
404 | extern void br_multicast_forward(struct net_bridge_mdb_entry *mdst, |
405 | struct sk_buff *skb, struct sk_buff *skb2); |
406 | extern int br_multicast_set_router(struct net_bridge *br, unsigned long val); |
407 | extern int br_multicast_set_port_router(struct net_bridge_port *p, |
408 | unsigned long val); |
409 | extern int br_multicast_toggle(struct net_bridge *br, unsigned long val); |
410 | extern int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val); |
411 | |
412 | static inline bool br_multicast_is_router(struct net_bridge *br) |
413 | { |
414 | return br->multicast_router == 2 || |
415 | (br->multicast_router == 1 && |
416 | timer_pending(&br->multicast_router_timer)); |
417 | } |
418 | #else |
419 | static inline int br_multicast_rcv(struct net_bridge *br, |
420 | struct net_bridge_port *port, |
421 | struct sk_buff *skb) |
422 | { |
423 | return 0; |
424 | } |
425 | |
426 | static inline struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br, |
427 | struct sk_buff *skb) |
428 | { |
429 | return NULL; |
430 | } |
431 | |
432 | static inline void br_multicast_add_port(struct net_bridge_port *port) |
433 | { |
434 | } |
435 | |
436 | static inline void br_multicast_del_port(struct net_bridge_port *port) |
437 | { |
438 | } |
439 | |
440 | static inline void br_multicast_enable_port(struct net_bridge_port *port) |
441 | { |
442 | } |
443 | |
444 | static inline void br_multicast_disable_port(struct net_bridge_port *port) |
445 | { |
446 | } |
447 | |
448 | static inline void br_multicast_init(struct net_bridge *br) |
449 | { |
450 | } |
451 | |
452 | static inline void br_multicast_open(struct net_bridge *br) |
453 | { |
454 | } |
455 | |
456 | static inline void br_multicast_stop(struct net_bridge *br) |
457 | { |
458 | } |
459 | |
460 | static inline void br_multicast_deliver(struct net_bridge_mdb_entry *mdst, |
461 | struct sk_buff *skb) |
462 | { |
463 | } |
464 | |
465 | static inline void br_multicast_forward(struct net_bridge_mdb_entry *mdst, |
466 | struct sk_buff *skb, |
467 | struct sk_buff *skb2) |
468 | { |
469 | } |
470 | static inline bool br_multicast_is_router(struct net_bridge *br) |
471 | { |
472 | return 0; |
473 | } |
474 | #endif |
475 | |
476 | /* br_netfilter.c */ |
477 | #ifdef CONFIG_BRIDGE_NETFILTER |
478 | extern int br_netfilter_init(void); |
479 | extern void br_netfilter_fini(void); |
480 | extern void br_netfilter_rtable_init(struct net_bridge *); |
481 | #else |
482 | #define br_netfilter_init() (0) |
483 | #define br_netfilter_fini() do { } while(0) |
484 | #define br_netfilter_rtable_init(x) |
485 | #endif |
486 | |
487 | /* br_stp.c */ |
488 | extern void br_log_state(const struct net_bridge_port *p); |
489 | extern struct net_bridge_port *br_get_port(struct net_bridge *br, |
490 | u16 port_no); |
491 | extern void br_init_port(struct net_bridge_port *p); |
492 | extern void br_become_designated_port(struct net_bridge_port *p); |
493 | |
494 | /* br_stp_if.c */ |
495 | extern void br_stp_enable_bridge(struct net_bridge *br); |
496 | extern void br_stp_disable_bridge(struct net_bridge *br); |
497 | extern void br_stp_set_enabled(struct net_bridge *br, unsigned long val); |
498 | extern void br_stp_enable_port(struct net_bridge_port *p); |
499 | extern void br_stp_disable_port(struct net_bridge_port *p); |
500 | extern bool br_stp_recalculate_bridge_id(struct net_bridge *br); |
501 | extern void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *a); |
502 | extern void br_stp_set_bridge_priority(struct net_bridge *br, |
503 | u16 newprio); |
504 | extern void br_stp_set_port_priority(struct net_bridge_port *p, |
505 | u8 newprio); |
506 | extern void br_stp_set_path_cost(struct net_bridge_port *p, |
507 | u32 path_cost); |
508 | extern ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id); |
509 | |
510 | /* br_stp_bpdu.c */ |
511 | struct stp_proto; |
512 | extern void br_stp_rcv(const struct stp_proto *proto, struct sk_buff *skb, |
513 | struct net_device *dev); |
514 | |
515 | /* br_stp_timer.c */ |
516 | extern void br_stp_timer_init(struct net_bridge *br); |
517 | extern void br_stp_port_timer_init(struct net_bridge_port *p); |
518 | extern unsigned long br_timer_value(const struct timer_list *timer); |
519 | |
520 | /* br.c */ |
521 | #if defined(CONFIG_ATM_LANE) || defined(CONFIG_ATM_LANE_MODULE) |
522 | extern int (*br_fdb_test_addr_hook)(struct net_device *dev, unsigned char *addr); |
523 | #endif |
524 | |
525 | /* br_netlink.c */ |
526 | extern int br_netlink_init(void); |
527 | extern void br_netlink_fini(void); |
528 | extern void br_ifinfo_notify(int event, struct net_bridge_port *port); |
529 | |
530 | #ifdef CONFIG_SYSFS |
531 | /* br_sysfs_if.c */ |
532 | extern const struct sysfs_ops brport_sysfs_ops; |
533 | extern int br_sysfs_addif(struct net_bridge_port *p); |
534 | extern int br_sysfs_renameif(struct net_bridge_port *p); |
535 | |
536 | /* br_sysfs_br.c */ |
537 | extern int br_sysfs_addbr(struct net_device *dev); |
538 | extern void br_sysfs_delbr(struct net_device *dev); |
539 | |
540 | #else |
541 | |
542 | #define br_sysfs_addif(p) (0) |
543 | #define br_sysfs_renameif(p) (0) |
544 | #define br_sysfs_addbr(dev) (0) |
545 | #define br_sysfs_delbr(dev) do { } while(0) |
546 | #endif /* CONFIG_SYSFS */ |
547 | |
548 | #endif |
549 |
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