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
br_port_get_rcu(const struct net_device * dev)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
br_port_get_rtnl(struct net_device * dev)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 */
br_is_root_bridge(const struct net_bridge * br)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
br_netpoll_info(struct net_bridge * br)299 static inline struct netpoll_info *br_netpoll_info(struct net_bridge *br)
300 {
301 return br->dev->npinfo;
302 }
303
br_netpoll_send_skb(const struct net_bridge_port * p,struct sk_buff * skb)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
br_netpoll_info(struct net_bridge * br)316 static inline struct netpoll_info *br_netpoll_info(struct net_bridge *br)
317 {
318 return NULL;
319 }
320
br_netpoll_send_skb(const struct net_bridge_port * p,struct sk_buff * skb)321 static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
322 struct sk_buff *skb)
323 {
324 }
325
br_netpoll_enable(struct net_bridge_port * p)326 static inline int br_netpoll_enable(struct net_bridge_port *p)
327 {
328 return 0;
329 }
330
br_netpoll_disable(struct net_bridge_port * p)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
br_multicast_is_router(struct net_bridge * br)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
br_multicast_rcv(struct net_bridge * br,struct net_bridge_port * port,struct sk_buff * skb)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
br_mdb_get(struct net_bridge * br,struct sk_buff * skb)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
br_multicast_add_port(struct net_bridge_port * port)432 static inline void br_multicast_add_port(struct net_bridge_port *port)
433 {
434 }
435
br_multicast_del_port(struct net_bridge_port * port)436 static inline void br_multicast_del_port(struct net_bridge_port *port)
437 {
438 }
439
br_multicast_enable_port(struct net_bridge_port * port)440 static inline void br_multicast_enable_port(struct net_bridge_port *port)
441 {
442 }
443
br_multicast_disable_port(struct net_bridge_port * port)444 static inline void br_multicast_disable_port(struct net_bridge_port *port)
445 {
446 }
447
br_multicast_init(struct net_bridge * br)448 static inline void br_multicast_init(struct net_bridge *br)
449 {
450 }
451
br_multicast_open(struct net_bridge * br)452 static inline void br_multicast_open(struct net_bridge *br)
453 {
454 }
455
br_multicast_stop(struct net_bridge * br)456 static inline void br_multicast_stop(struct net_bridge *br)
457 {
458 }
459
br_multicast_deliver(struct net_bridge_mdb_entry * mdst,struct sk_buff * skb)460 static inline void br_multicast_deliver(struct net_bridge_mdb_entry *mdst,
461 struct sk_buff *skb)
462 {
463 }
464
br_multicast_forward(struct net_bridge_mdb_entry * mdst,struct sk_buff * skb,struct sk_buff * skb2)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 }
br_multicast_is_router(struct net_bridge * br)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