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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
51#define BR_FDB_NOTIFY_SETTABLE_BITS (FDB_NOTIFY_BIT | FDB_NOTIFY_INACTIVE_BIT)
52
53typedef struct bridge_id bridge_id;
54typedef struct mac_addr mac_addr;
55typedef __u16 port_id;
56
57struct bridge_id {
58 unsigned char prio[2];
59 unsigned char addr[ETH_ALEN];
60};
61
62struct mac_addr {
63 unsigned char addr[ETH_ALEN];
64};
65
66#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
67/* our own querier */
68struct bridge_mcast_own_query {
69 struct timer_list timer;
70 u32 startup_sent;
71};
72
73/* other querier */
74struct bridge_mcast_other_query {
75 struct timer_list timer;
76 unsigned long delay_time;
77};
78
79/* selected querier */
80struct bridge_mcast_querier {
81 struct br_ip addr;
82 struct net_bridge_port __rcu *port;
83};
84
85/* IGMP/MLD statistics */
86struct bridge_mcast_stats {
87 struct br_mcast_stats mstats;
88 struct u64_stats_sync syncp;
89};
90#endif
91
92struct br_vlan_stats {
93 u64 rx_bytes;
94 u64 rx_packets;
95 u64 tx_bytes;
96 u64 tx_packets;
97 struct u64_stats_sync syncp;
98};
99
100struct br_tunnel_info {
101 __be64 tunnel_id;
102 struct metadata_dst *tunnel_dst;
103};
104
105/* private vlan flags */
106enum {
107 BR_VLFLAG_PER_PORT_STATS = BIT(0),
108 BR_VLFLAG_ADDED_BY_SWITCHDEV = BIT(1),
109};
110
111/**
112 * struct net_bridge_vlan - per-vlan entry
113 *
114 * @vnode: rhashtable member
115 * @vid: VLAN id
116 * @flags: bridge vlan flags
117 * @priv_flags: private (in-kernel) bridge vlan flags
118 * @state: STP state (e.g. blocking, learning, forwarding)
119 * @stats: per-cpu VLAN statistics
120 * @br: if MASTER flag set, this points to a bridge struct
121 * @port: if MASTER flag unset, this points to a port struct
122 * @refcnt: if MASTER flag set, this is bumped for each port referencing it
123 * @brvlan: if MASTER flag unset, this points to the global per-VLAN context
124 * for this VLAN entry
125 * @vlist: sorted list of VLAN entries
126 * @rcu: used for entry destruction
127 *
128 * This structure is shared between the global per-VLAN entries contained in
129 * the bridge rhashtable and the local per-port per-VLAN entries contained in
130 * the port's rhashtable. The union entries should be interpreted depending on
131 * the entry flags that are set.
132 */
133struct net_bridge_vlan {
134 struct rhash_head vnode;
135 struct rhash_head tnode;
136 u16 vid;
137 u16 flags;
138 u16 priv_flags;
139 u8 state;
140 struct br_vlan_stats __percpu *stats;
141 union {
142 struct net_bridge *br;
143 struct net_bridge_port *port;
144 };
145 union {
146 refcount_t refcnt;
147 struct net_bridge_vlan *brvlan;
148 };
149
150 struct br_tunnel_info tinfo;
151
152 struct list_head vlist;
153
154 struct rcu_head rcu;
155};
156
157/**
158 * struct net_bridge_vlan_group
159 *
160 * @vlan_hash: VLAN entry rhashtable
161 * @vlan_list: sorted VLAN entry list
162 * @num_vlans: number of total VLAN entries
163 * @pvid: PVID VLAN id
164 * @pvid_state: PVID's STP state (e.g. forwarding, learning, blocking)
165 *
166 * IMPORTANT: Be careful when checking if there're VLAN entries using list
167 * primitives because the bridge can have entries in its list which
168 * are just for global context but not for filtering, i.e. they have
169 * the master flag set but not the brentry flag. If you have to check
170 * if there're "real" entries in the bridge please test @num_vlans
171 */
172struct net_bridge_vlan_group {
173 struct rhashtable vlan_hash;
174 struct rhashtable tunnel_hash;
175 struct list_head vlan_list;
176 u16 num_vlans;
177 u16 pvid;
178 u8 pvid_state;
179};
180
181/* bridge fdb flags */
182enum {
183 BR_FDB_LOCAL,
184 BR_FDB_STATIC,
185 BR_FDB_STICKY,
186 BR_FDB_ADDED_BY_USER,
187 BR_FDB_ADDED_BY_EXT_LEARN,
188 BR_FDB_OFFLOADED,
189 BR_FDB_NOTIFY,
190 BR_FDB_NOTIFY_INACTIVE
191};
192
193struct net_bridge_fdb_key {
194 mac_addr addr;
195 u16 vlan_id;
196};
197
198struct net_bridge_fdb_entry {
199 struct rhash_head rhnode;
200 struct net_bridge_port *dst;
201
202 struct net_bridge_fdb_key key;
203 struct hlist_node fdb_node;
204 unsigned long flags;
205
206 /* write-heavy members should not affect lookups */
207 unsigned long updated ____cacheline_aligned_in_smp;
208 unsigned long used;
209
210 struct rcu_head rcu;
211};
212
213#define MDB_PG_FLAGS_PERMANENT BIT(0)
214#define MDB_PG_FLAGS_OFFLOAD BIT(1)
215#define MDB_PG_FLAGS_FAST_LEAVE BIT(2)
216
217struct net_bridge_port_group {
218 struct net_bridge_port *port;
219 struct net_bridge_port_group __rcu *next;
220 struct hlist_node mglist;
221 struct rcu_head rcu;
222 struct timer_list timer;
223 struct br_ip addr;
224 unsigned char eth_addr[ETH_ALEN] __aligned(2);
225 unsigned char flags;
226};
227
228struct net_bridge_mdb_entry {
229 struct rhash_head rhnode;
230 struct net_bridge *br;
231 struct net_bridge_port_group __rcu *ports;
232 struct rcu_head rcu;
233 struct timer_list timer;
234 struct br_ip addr;
235 bool host_joined;
236 struct hlist_node mdb_node;
237};
238
239struct net_bridge_port {
240 struct net_bridge *br;
241 struct net_device *dev;
242 struct list_head list;
243
244 unsigned long flags;
245#ifdef CONFIG_BRIDGE_VLAN_FILTERING
246 struct net_bridge_vlan_group __rcu *vlgrp;
247#endif
248 struct net_bridge_port __rcu *backup_port;
249
250 /* STP */
251 u8 priority;
252 u8 state;
253 u16 port_no;
254 unsigned char topology_change_ack;
255 unsigned char config_pending;
256 port_id port_id;
257 port_id designated_port;
258 bridge_id designated_root;
259 bridge_id designated_bridge;
260 u32 path_cost;
261 u32 designated_cost;
262 unsigned long designated_age;
263
264 struct timer_list forward_delay_timer;
265 struct timer_list hold_timer;
266 struct timer_list message_age_timer;
267 struct kobject kobj;
268 struct rcu_head rcu;
269
270#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
271 struct bridge_mcast_own_query ip4_own_query;
272#if IS_ENABLED(CONFIG_IPV6)
273 struct bridge_mcast_own_query ip6_own_query;
274#endif /* IS_ENABLED(CONFIG_IPV6) */
275 unsigned char multicast_router;
276 struct bridge_mcast_stats __percpu *mcast_stats;
277 struct timer_list multicast_router_timer;
278 struct hlist_head mglist;
279 struct hlist_node rlist;
280#endif
281
282#ifdef CONFIG_SYSFS
283 char sysfs_name[IFNAMSIZ];
284#endif
285
286#ifdef CONFIG_NET_POLL_CONTROLLER
287 struct netpoll *np;
288#endif
289#ifdef CONFIG_NET_SWITCHDEV
290 int offload_fwd_mark;
291#endif
292 u16 group_fwd_mask;
293 u16 backup_redirected_cnt;
294
295 struct bridge_stp_xstats stp_xstats;
296};
297
298#define kobj_to_brport(obj) container_of(obj, struct net_bridge_port, kobj)
299
300#define br_auto_port(p) ((p)->flags & BR_AUTO_MASK)
301#define br_promisc_port(p) ((p)->flags & BR_PROMISC)
302
303static inline struct net_bridge_port *br_port_get_rcu(const struct net_device *dev)
304{
305 return rcu_dereference(dev->rx_handler_data);
306}
307
308static inline struct net_bridge_port *br_port_get_rtnl(const struct net_device *dev)
309{
310 return netif_is_bridge_port(dev) ?
311 rtnl_dereference(dev->rx_handler_data) : NULL;
312}
313
314static inline struct net_bridge_port *br_port_get_rtnl_rcu(const struct net_device *dev)
315{
316 return netif_is_bridge_port(dev) ?
317 rcu_dereference_rtnl(dev->rx_handler_data) : NULL;
318}
319
320enum net_bridge_opts {
321 BROPT_VLAN_ENABLED,
322 BROPT_VLAN_STATS_ENABLED,
323 BROPT_NF_CALL_IPTABLES,
324 BROPT_NF_CALL_IP6TABLES,
325 BROPT_NF_CALL_ARPTABLES,
326 BROPT_GROUP_ADDR_SET,
327 BROPT_MULTICAST_ENABLED,
328 BROPT_MULTICAST_QUERIER,
329 BROPT_MULTICAST_QUERY_USE_IFADDR,
330 BROPT_MULTICAST_STATS_ENABLED,
331 BROPT_HAS_IPV6_ADDR,
332 BROPT_NEIGH_SUPPRESS_ENABLED,
333 BROPT_MTU_SET_BY_USER,
334 BROPT_VLAN_STATS_PER_PORT,
335 BROPT_NO_LL_LEARN,
336 BROPT_VLAN_BRIDGE_BINDING,
337};
338
339struct net_bridge {
340 spinlock_t lock;
341 spinlock_t hash_lock;
342 struct list_head port_list;
343 struct net_device *dev;
344 struct pcpu_sw_netstats __percpu *stats;
345 unsigned long options;
346 /* These fields are accessed on each packet */
347#ifdef CONFIG_BRIDGE_VLAN_FILTERING
348 __be16 vlan_proto;
349 u16 default_pvid;
350 struct net_bridge_vlan_group __rcu *vlgrp;
351#endif
352
353 struct rhashtable fdb_hash_tbl;
354#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
355 union {
356 struct rtable fake_rtable;
357 struct rt6_info fake_rt6_info;
358 };
359#endif
360 u16 group_fwd_mask;
361 u16 group_fwd_mask_required;
362
363 /* STP */
364 bridge_id designated_root;
365 bridge_id bridge_id;
366 unsigned char topology_change;
367 unsigned char topology_change_detected;
368 u16 root_port;
369 unsigned long max_age;
370 unsigned long hello_time;
371 unsigned long forward_delay;
372 unsigned long ageing_time;
373 unsigned long bridge_max_age;
374 unsigned long bridge_hello_time;
375 unsigned long bridge_forward_delay;
376 unsigned long bridge_ageing_time;
377 u32 root_path_cost;
378
379 u8 group_addr[ETH_ALEN];
380
381 enum {
382 BR_NO_STP, /* no spanning tree */
383 BR_KERNEL_STP, /* old STP in kernel */
384 BR_USER_STP, /* new RSTP in userspace */
385 } stp_enabled;
386
387#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
388
389 u32 hash_max;
390
391 u32 multicast_last_member_count;
392 u32 multicast_startup_query_count;
393
394 u8 multicast_igmp_version;
395 u8 multicast_router;
396#if IS_ENABLED(CONFIG_IPV6)
397 u8 multicast_mld_version;
398#endif
399 spinlock_t multicast_lock;
400 unsigned long multicast_last_member_interval;
401 unsigned long multicast_membership_interval;
402 unsigned long multicast_querier_interval;
403 unsigned long multicast_query_interval;
404 unsigned long multicast_query_response_interval;
405 unsigned long multicast_startup_query_interval;
406
407 struct rhashtable mdb_hash_tbl;
408
409 struct hlist_head mdb_list;
410 struct hlist_head router_list;
411
412 struct timer_list multicast_router_timer;
413 struct bridge_mcast_other_query ip4_other_query;
414 struct bridge_mcast_own_query ip4_own_query;
415 struct bridge_mcast_querier ip4_querier;
416 struct bridge_mcast_stats __percpu *mcast_stats;
417#if IS_ENABLED(CONFIG_IPV6)
418 struct bridge_mcast_other_query ip6_other_query;
419 struct bridge_mcast_own_query ip6_own_query;
420 struct bridge_mcast_querier ip6_querier;
421#endif /* IS_ENABLED(CONFIG_IPV6) */
422#endif
423
424 struct timer_list hello_timer;
425 struct timer_list tcn_timer;
426 struct timer_list topology_change_timer;
427 struct delayed_work gc_work;
428 struct kobject *ifobj;
429 u32 auto_cnt;
430
431#ifdef CONFIG_NET_SWITCHDEV
432 int offload_fwd_mark;
433#endif
434 struct hlist_head fdb_list;
435
436#if IS_ENABLED(CONFIG_BRIDGE_MRP)
437 struct list_head mrp_list;
438#endif
439};
440
441struct br_input_skb_cb {
442 struct net_device *brdev;
443
444 u16 frag_max_size;
445#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
446 u8 igmp;
447 u8 mrouters_only:1;
448#endif
449 u8 proxyarp_replied:1;
450 u8 src_port_isolated:1;
451#ifdef CONFIG_BRIDGE_VLAN_FILTERING
452 u8 vlan_filtered:1;
453#endif
454#ifdef CONFIG_NETFILTER_FAMILY_BRIDGE
455 u8 br_netfilter_broute:1;
456#endif
457
458#ifdef CONFIG_NET_SWITCHDEV
459 int offload_fwd_mark;
460#endif
461};
462
463#define BR_INPUT_SKB_CB(__skb) ((struct br_input_skb_cb *)(__skb)->cb)
464
465#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
466# define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb) (BR_INPUT_SKB_CB(__skb)->mrouters_only)
467#else
468# define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb) (0)
469#endif
470
471#define br_printk(level, br, format, args...) \
472 printk(level "%s: " format, (br)->dev->name, ##args)
473
474#define br_err(__br, format, args...) \
475 br_printk(KERN_ERR, __br, format, ##args)
476#define br_warn(__br, format, args...) \
477 br_printk(KERN_WARNING, __br, format, ##args)
478#define br_notice(__br, format, args...) \
479 br_printk(KERN_NOTICE, __br, format, ##args)
480#define br_info(__br, format, args...) \
481 br_printk(KERN_INFO, __br, format, ##args)
482
483#define br_debug(br, format, args...) \
484 pr_debug("%s: " format, (br)->dev->name, ##args)
485
486/* called under bridge lock */
487static inline int br_is_root_bridge(const struct net_bridge *br)
488{
489 return !memcmp(&br->bridge_id, &br->designated_root, 8);
490}
491
492/* check if a VLAN entry is global */
493static inline bool br_vlan_is_master(const struct net_bridge_vlan *v)
494{
495 return v->flags & BRIDGE_VLAN_INFO_MASTER;
496}
497
498/* check if a VLAN entry is used by the bridge */
499static inline bool br_vlan_is_brentry(const struct net_bridge_vlan *v)
500{
501 return v->flags & BRIDGE_VLAN_INFO_BRENTRY;
502}
503
504/* check if we should use the vlan entry, returns false if it's only context */
505static inline bool br_vlan_should_use(const struct net_bridge_vlan *v)
506{
507 if (br_vlan_is_master(v)) {
508 if (br_vlan_is_brentry(v))
509 return true;
510 else
511 return false;
512 }
513
514 return true;
515}
516
517static inline bool nbp_state_should_learn(const struct net_bridge_port *p)
518{
519 return p->state == BR_STATE_LEARNING || p->state == BR_STATE_FORWARDING;
520}
521
522static inline bool br_vlan_valid_id(u16 vid, struct netlink_ext_ack *extack)
523{
524 bool ret = vid > 0 && vid < VLAN_VID_MASK;
525
526 if (!ret)
527 NL_SET_ERR_MSG_MOD(extack, "Vlan id is invalid");
528
529 return ret;
530}
531
532static inline bool br_vlan_valid_range(const struct bridge_vlan_info *cur,
533 const struct bridge_vlan_info *last,
534 struct netlink_ext_ack *extack)
535{
536 /* pvid flag is not allowed in ranges */
537 if (cur->flags & BRIDGE_VLAN_INFO_PVID) {
538 NL_SET_ERR_MSG_MOD(extack, "Pvid isn't allowed in a range");
539 return false;
540 }
541
542 /* when cur is the range end, check if:
543 * - it has range start flag
544 * - range ids are invalid (end is equal to or before start)
545 */
546 if (last) {
547 if (cur->flags & BRIDGE_VLAN_INFO_RANGE_BEGIN) {
548 NL_SET_ERR_MSG_MOD(extack, "Found a new vlan range start while processing one");
549 return false;
550 } else if (!(cur->flags & BRIDGE_VLAN_INFO_RANGE_END)) {
551 NL_SET_ERR_MSG_MOD(extack, "Vlan range end flag is missing");
552 return false;
553 } else if (cur->vid <= last->vid) {
554 NL_SET_ERR_MSG_MOD(extack, "End vlan id is less than or equal to start vlan id");
555 return false;
556 }
557 }
558
559 /* check for required range flags */
560 if (!(cur->flags & (BRIDGE_VLAN_INFO_RANGE_BEGIN |
561 BRIDGE_VLAN_INFO_RANGE_END))) {
562 NL_SET_ERR_MSG_MOD(extack, "Both vlan range flags are missing");
563 return false;
564 }
565
566 return true;
567}
568
569static inline int br_afspec_cmd_to_rtm(int cmd)
570{
571 switch (cmd) {
572 case RTM_SETLINK:
573 return RTM_NEWVLAN;
574 case RTM_DELLINK:
575 return RTM_DELVLAN;
576 }
577
578 return 0;
579}
580
581static inline int br_opt_get(const struct net_bridge *br,
582 enum net_bridge_opts opt)
583{
584 return test_bit(opt, &br->options);
585}
586
587int br_boolopt_toggle(struct net_bridge *br, enum br_boolopt_id opt, bool on,
588 struct netlink_ext_ack *extack);
589int br_boolopt_get(const struct net_bridge *br, enum br_boolopt_id opt);
590int br_boolopt_multi_toggle(struct net_bridge *br,
591 struct br_boolopt_multi *bm,
592 struct netlink_ext_ack *extack);
593void br_boolopt_multi_get(const struct net_bridge *br,
594 struct br_boolopt_multi *bm);
595void br_opt_toggle(struct net_bridge *br, enum net_bridge_opts opt, bool on);
596
597/* br_device.c */
598void br_dev_setup(struct net_device *dev);
599void br_dev_delete(struct net_device *dev, struct list_head *list);
600netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev);
601#ifdef CONFIG_NET_POLL_CONTROLLER
602static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
603 struct sk_buff *skb)
604{
605 netpoll_send_skb(p->np, skb);
606}
607
608int br_netpoll_enable(struct net_bridge_port *p);
609void br_netpoll_disable(struct net_bridge_port *p);
610#else
611static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
612 struct sk_buff *skb)
613{
614}
615
616static inline int br_netpoll_enable(struct net_bridge_port *p)
617{
618 return 0;
619}
620
621static inline void br_netpoll_disable(struct net_bridge_port *p)
622{
623}
624#endif
625
626/* br_fdb.c */
627int br_fdb_init(void);
628void br_fdb_fini(void);
629int br_fdb_hash_init(struct net_bridge *br);
630void br_fdb_hash_fini(struct net_bridge *br);
631void br_fdb_flush(struct net_bridge *br);
632void br_fdb_find_delete_local(struct net_bridge *br,
633 const struct net_bridge_port *p,
634 const unsigned char *addr, u16 vid);
635void br_fdb_changeaddr(struct net_bridge_port *p, const unsigned char *newaddr);
636void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr);
637void br_fdb_cleanup(struct work_struct *work);
638void br_fdb_delete_by_port(struct net_bridge *br,
639 const struct net_bridge_port *p, u16 vid, int do_all);
640struct net_bridge_fdb_entry *br_fdb_find_rcu(struct net_bridge *br,
641 const unsigned char *addr,
642 __u16 vid);
643int br_fdb_test_addr(struct net_device *dev, unsigned char *addr);
644int br_fdb_fillbuf(struct net_bridge *br, void *buf, unsigned long count,
645 unsigned long off);
646int br_fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
647 const unsigned char *addr, u16 vid);
648void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source,
649 const unsigned char *addr, u16 vid, unsigned long flags);
650
651int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
652 struct net_device *dev, const unsigned char *addr, u16 vid);
653int br_fdb_add(struct ndmsg *nlh, struct nlattr *tb[], struct net_device *dev,
654 const unsigned char *addr, u16 vid, u16 nlh_flags,
655 struct netlink_ext_ack *extack);
656int br_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
657 struct net_device *dev, struct net_device *fdev, int *idx);
658int br_fdb_get(struct sk_buff *skb, struct nlattr *tb[], struct net_device *dev,
659 const unsigned char *addr, u16 vid, u32 portid, u32 seq,
660 struct netlink_ext_ack *extack);
661int br_fdb_sync_static(struct net_bridge *br, struct net_bridge_port *p);
662void br_fdb_unsync_static(struct net_bridge *br, struct net_bridge_port *p);
663int br_fdb_external_learn_add(struct net_bridge *br, struct net_bridge_port *p,
664 const unsigned char *addr, u16 vid,
665 bool swdev_notify);
666int br_fdb_external_learn_del(struct net_bridge *br, struct net_bridge_port *p,
667 const unsigned char *addr, u16 vid,
668 bool swdev_notify);
669void br_fdb_offloaded_set(struct net_bridge *br, struct net_bridge_port *p,
670 const unsigned char *addr, u16 vid, bool offloaded);
671
672/* br_forward.c */
673enum br_pkt_type {
674 BR_PKT_UNICAST,
675 BR_PKT_MULTICAST,
676 BR_PKT_BROADCAST
677};
678int br_dev_queue_push_xmit(struct net *net, struct sock *sk, struct sk_buff *skb);
679void br_forward(const struct net_bridge_port *to, struct sk_buff *skb,
680 bool local_rcv, bool local_orig);
681int br_forward_finish(struct net *net, struct sock *sk, struct sk_buff *skb);
682void br_flood(struct net_bridge *br, struct sk_buff *skb,
683 enum br_pkt_type pkt_type, bool local_rcv, bool local_orig);
684
685/* return true if both source port and dest port are isolated */
686static inline bool br_skb_isolated(const struct net_bridge_port *to,
687 const struct sk_buff *skb)
688{
689 return BR_INPUT_SKB_CB(skb)->src_port_isolated &&
690 (to->flags & BR_ISOLATED);
691}
692
693/* br_if.c */
694void br_port_carrier_check(struct net_bridge_port *p, bool *notified);
695int br_add_bridge(struct net *net, const char *name);
696int br_del_bridge(struct net *net, const char *name);
697int br_add_if(struct net_bridge *br, struct net_device *dev,
698 struct netlink_ext_ack *extack);
699int br_del_if(struct net_bridge *br, struct net_device *dev);
700void br_mtu_auto_adjust(struct net_bridge *br);
701netdev_features_t br_features_recompute(struct net_bridge *br,
702 netdev_features_t features);
703void br_port_flags_change(struct net_bridge_port *port, unsigned long mask);
704void br_manage_promisc(struct net_bridge *br);
705int nbp_backup_change(struct net_bridge_port *p, struct net_device *backup_dev);
706
707/* br_input.c */
708int br_handle_frame_finish(struct net *net, struct sock *sk, struct sk_buff *skb);
709rx_handler_func_t *br_get_rx_handler(const struct net_device *dev);
710
711static inline bool br_rx_handler_check_rcu(const struct net_device *dev)
712{
713 return rcu_dereference(dev->rx_handler) == br_get_rx_handler(dev);
714}
715
716static inline bool br_rx_handler_check_rtnl(const struct net_device *dev)
717{
718 return rcu_dereference_rtnl(dev->rx_handler) == br_get_rx_handler(dev);
719}
720
721static inline struct net_bridge_port *br_port_get_check_rcu(const struct net_device *dev)
722{
723 return br_rx_handler_check_rcu(dev) ? br_port_get_rcu(dev) : NULL;
724}
725
726static inline struct net_bridge_port *
727br_port_get_check_rtnl(const struct net_device *dev)
728{
729 return br_rx_handler_check_rtnl(dev) ? br_port_get_rtnl_rcu(dev) : NULL;
730}
731
732/* br_ioctl.c */
733int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
734int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd,
735 void __user *arg);
736
737/* br_multicast.c */
738#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
739int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
740 struct sk_buff *skb, u16 vid);
741struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
742 struct sk_buff *skb, u16 vid);
743int br_multicast_add_port(struct net_bridge_port *port);
744void br_multicast_del_port(struct net_bridge_port *port);
745void br_multicast_enable_port(struct net_bridge_port *port);
746void br_multicast_disable_port(struct net_bridge_port *port);
747void br_multicast_init(struct net_bridge *br);
748void br_multicast_open(struct net_bridge *br);
749void br_multicast_stop(struct net_bridge *br);
750void br_multicast_dev_del(struct net_bridge *br);
751void br_multicast_flood(struct net_bridge_mdb_entry *mdst,
752 struct sk_buff *skb, bool local_rcv, bool local_orig);
753int br_multicast_set_router(struct net_bridge *br, unsigned long val);
754int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val);
755int br_multicast_toggle(struct net_bridge *br, unsigned long val);
756int br_multicast_set_querier(struct net_bridge *br, unsigned long val);
757int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val);
758int br_multicast_set_igmp_version(struct net_bridge *br, unsigned long val);
759#if IS_ENABLED(CONFIG_IPV6)
760int br_multicast_set_mld_version(struct net_bridge *br, unsigned long val);
761#endif
762struct net_bridge_mdb_entry *
763br_mdb_ip_get(struct net_bridge *br, struct br_ip *dst);
764struct net_bridge_mdb_entry *
765br_multicast_new_group(struct net_bridge *br, struct br_ip *group);
766struct net_bridge_port_group *
767br_multicast_new_port_group(struct net_bridge_port *port, struct br_ip *group,
768 struct net_bridge_port_group __rcu *next,
769 unsigned char flags, const unsigned char *src);
770int br_mdb_hash_init(struct net_bridge *br);
771void br_mdb_hash_fini(struct net_bridge *br);
772void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port,
773 struct br_ip *group, int type, u8 flags);
774void br_rtr_notify(struct net_device *dev, struct net_bridge_port *port,
775 int type);
776void br_multicast_count(struct net_bridge *br, const struct net_bridge_port *p,
777 const struct sk_buff *skb, u8 type, u8 dir);
778int br_multicast_init_stats(struct net_bridge *br);
779void br_multicast_uninit_stats(struct net_bridge *br);
780void br_multicast_get_stats(const struct net_bridge *br,
781 const struct net_bridge_port *p,
782 struct br_mcast_stats *dest);
783void br_mdb_init(void);
784void br_mdb_uninit(void);
785void br_multicast_host_join(struct net_bridge_mdb_entry *mp, bool notify);
786void br_multicast_host_leave(struct net_bridge_mdb_entry *mp, bool notify);
787
788#define mlock_dereference(X, br) \
789 rcu_dereference_protected(X, lockdep_is_held(&br->multicast_lock))
790
791static inline bool br_multicast_is_router(struct net_bridge *br)
792{
793 return br->multicast_router == 2 ||
794 (br->multicast_router == 1 &&
795 timer_pending(&br->multicast_router_timer));
796}
797
798static inline bool
799__br_multicast_querier_exists(struct net_bridge *br,
800 struct bridge_mcast_other_query *querier,
801 const bool is_ipv6)
802{
803 bool own_querier_enabled;
804
805 if (br_opt_get(br, BROPT_MULTICAST_QUERIER)) {
806 if (is_ipv6 && !br_opt_get(br, BROPT_HAS_IPV6_ADDR))
807 own_querier_enabled = false;
808 else
809 own_querier_enabled = true;
810 } else {
811 own_querier_enabled = false;
812 }
813
814 return time_is_before_jiffies(querier->delay_time) &&
815 (own_querier_enabled || timer_pending(&querier->timer));
816}
817
818static inline bool br_multicast_querier_exists(struct net_bridge *br,
819 struct ethhdr *eth)
820{
821 switch (eth->h_proto) {
822 case (htons(ETH_P_IP)):
823 return __br_multicast_querier_exists(br,
824 &br->ip4_other_query, false);
825#if IS_ENABLED(CONFIG_IPV6)
826 case (htons(ETH_P_IPV6)):
827 return __br_multicast_querier_exists(br,
828 &br->ip6_other_query, true);
829#endif
830 default:
831 return false;
832 }
833}
834
835static inline int br_multicast_igmp_type(const struct sk_buff *skb)
836{
837 return BR_INPUT_SKB_CB(skb)->igmp;
838}
839#else
840static inline int br_multicast_rcv(struct net_bridge *br,
841 struct net_bridge_port *port,
842 struct sk_buff *skb,
843 u16 vid)
844{
845 return 0;
846}
847
848static inline struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
849 struct sk_buff *skb, u16 vid)
850{
851 return NULL;
852}
853
854static inline int br_multicast_add_port(struct net_bridge_port *port)
855{
856 return 0;
857}
858
859static inline void br_multicast_del_port(struct net_bridge_port *port)
860{
861}
862
863static inline void br_multicast_enable_port(struct net_bridge_port *port)
864{
865}
866
867static inline void br_multicast_disable_port(struct net_bridge_port *port)
868{
869}
870
871static inline void br_multicast_init(struct net_bridge *br)
872{
873}
874
875static inline void br_multicast_open(struct net_bridge *br)
876{
877}
878
879static inline void br_multicast_stop(struct net_bridge *br)
880{
881}
882
883static inline void br_multicast_dev_del(struct net_bridge *br)
884{
885}
886
887static inline void br_multicast_flood(struct net_bridge_mdb_entry *mdst,
888 struct sk_buff *skb,
889 bool local_rcv, bool local_orig)
890{
891}
892
893static inline bool br_multicast_is_router(struct net_bridge *br)
894{
895 return false;
896}
897
898static inline bool br_multicast_querier_exists(struct net_bridge *br,
899 struct ethhdr *eth)
900{
901 return false;
902}
903
904static inline void br_mdb_init(void)
905{
906}
907
908static inline void br_mdb_uninit(void)
909{
910}
911
912static inline int br_mdb_hash_init(struct net_bridge *br)
913{
914 return 0;
915}
916
917static inline void br_mdb_hash_fini(struct net_bridge *br)
918{
919}
920
921static inline void br_multicast_count(struct net_bridge *br,
922 const struct net_bridge_port *p,
923 const struct sk_buff *skb,
924 u8 type, u8 dir)
925{
926}
927
928static inline int br_multicast_init_stats(struct net_bridge *br)
929{
930 return 0;
931}
932
933static inline void br_multicast_uninit_stats(struct net_bridge *br)
934{
935}
936
937static inline int br_multicast_igmp_type(const struct sk_buff *skb)
938{
939 return 0;
940}
941#endif
942
943/* br_vlan.c */
944#ifdef CONFIG_BRIDGE_VLAN_FILTERING
945bool br_allowed_ingress(const struct net_bridge *br,
946 struct net_bridge_vlan_group *vg, struct sk_buff *skb,
947 u16 *vid, u8 *state);
948bool br_allowed_egress(struct net_bridge_vlan_group *vg,
949 const struct sk_buff *skb);
950bool br_should_learn(struct net_bridge_port *p, struct sk_buff *skb, u16 *vid);
951struct sk_buff *br_handle_vlan(struct net_bridge *br,
952 const struct net_bridge_port *port,
953 struct net_bridge_vlan_group *vg,
954 struct sk_buff *skb);
955int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags,
956 bool *changed, struct netlink_ext_ack *extack);
957int br_vlan_delete(struct net_bridge *br, u16 vid);
958void br_vlan_flush(struct net_bridge *br);
959struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg, u16 vid);
960void br_recalculate_fwd_mask(struct net_bridge *br);
961int __br_vlan_filter_toggle(struct net_bridge *br, unsigned long val);
962int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val);
963int __br_vlan_set_proto(struct net_bridge *br, __be16 proto);
964int br_vlan_set_proto(struct net_bridge *br, unsigned long val);
965int br_vlan_set_stats(struct net_bridge *br, unsigned long val);
966int br_vlan_set_stats_per_port(struct net_bridge *br, unsigned long val);
967int br_vlan_init(struct net_bridge *br);
968int br_vlan_set_default_pvid(struct net_bridge *br, unsigned long val);
969int __br_vlan_set_default_pvid(struct net_bridge *br, u16 pvid,
970 struct netlink_ext_ack *extack);
971int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags,
972 bool *changed, struct netlink_ext_ack *extack);
973int nbp_vlan_delete(struct net_bridge_port *port, u16 vid);
974void nbp_vlan_flush(struct net_bridge_port *port);
975int nbp_vlan_init(struct net_bridge_port *port, struct netlink_ext_ack *extack);
976int nbp_get_num_vlan_infos(struct net_bridge_port *p, u32 filter_mask);
977void br_vlan_get_stats(const struct net_bridge_vlan *v,
978 struct br_vlan_stats *stats);
979void br_vlan_port_event(struct net_bridge_port *p, unsigned long event);
980int br_vlan_bridge_event(struct net_device *dev, unsigned long event,
981 void *ptr);
982void br_vlan_rtnl_init(void);
983void br_vlan_rtnl_uninit(void);
984void br_vlan_notify(const struct net_bridge *br,
985 const struct net_bridge_port *p,
986 u16 vid, u16 vid_range,
987 int cmd);
988bool br_vlan_can_enter_range(const struct net_bridge_vlan *v_curr,
989 const struct net_bridge_vlan *range_end);
990
991static inline struct net_bridge_vlan_group *br_vlan_group(
992 const struct net_bridge *br)
993{
994 return rtnl_dereference(br->vlgrp);
995}
996
997static inline struct net_bridge_vlan_group *nbp_vlan_group(
998 const struct net_bridge_port *p)
999{
1000 return rtnl_dereference(p->vlgrp);
1001}
1002
1003static inline struct net_bridge_vlan_group *br_vlan_group_rcu(
1004 const struct net_bridge *br)
1005{
1006 return rcu_dereference(br->vlgrp);
1007}
1008
1009static inline struct net_bridge_vlan_group *nbp_vlan_group_rcu(
1010 const struct net_bridge_port *p)
1011{
1012 return rcu_dereference(p->vlgrp);
1013}
1014
1015/* Since bridge now depends on 8021Q module, but the time bridge sees the
1016 * skb, the vlan tag will always be present if the frame was tagged.
1017 */
1018static inline int br_vlan_get_tag(const struct sk_buff *skb, u16 *vid)
1019{
1020 int err = 0;
1021
1022 if (skb_vlan_tag_present(skb)) {
1023 *vid = skb_vlan_tag_get_id(skb);
1024 } else {
1025 *vid = 0;
1026 err = -EINVAL;
1027 }
1028
1029 return err;
1030}
1031
1032static inline u16 br_get_pvid(const struct net_bridge_vlan_group *vg)
1033{
1034 if (!vg)
1035 return 0;
1036
1037 smp_rmb();
1038 return vg->pvid;
1039}
1040
1041static inline u16 br_vlan_flags(const struct net_bridge_vlan *v, u16 pvid)
1042{
1043 return v->vid == pvid ? v->flags | BRIDGE_VLAN_INFO_PVID : v->flags;
1044}
1045#else
1046static inline bool br_allowed_ingress(const struct net_bridge *br,
1047 struct net_bridge_vlan_group *vg,
1048 struct sk_buff *skb,
1049 u16 *vid, u8 *state)
1050{
1051 return true;
1052}
1053
1054static inline bool br_allowed_egress(struct net_bridge_vlan_group *vg,
1055 const struct sk_buff *skb)
1056{
1057 return true;
1058}
1059
1060static inline bool br_should_learn(struct net_bridge_port *p,
1061 struct sk_buff *skb, u16 *vid)
1062{
1063 return true;
1064}
1065
1066static inline struct sk_buff *br_handle_vlan(struct net_bridge *br,
1067 const struct net_bridge_port *port,
1068 struct net_bridge_vlan_group *vg,
1069 struct sk_buff *skb)
1070{
1071 return skb;
1072}
1073
1074static inline int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags,
1075 bool *changed, struct netlink_ext_ack *extack)
1076{
1077 *changed = false;
1078 return -EOPNOTSUPP;
1079}
1080
1081static inline int br_vlan_delete(struct net_bridge *br, u16 vid)
1082{
1083 return -EOPNOTSUPP;
1084}
1085
1086static inline void br_vlan_flush(struct net_bridge *br)
1087{
1088}
1089
1090static inline void br_recalculate_fwd_mask(struct net_bridge *br)
1091{
1092}
1093
1094static inline int br_vlan_init(struct net_bridge *br)
1095{
1096 return 0;
1097}
1098
1099static inline int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags,
1100 bool *changed, struct netlink_ext_ack *extack)
1101{
1102 *changed = false;
1103 return -EOPNOTSUPP;
1104}
1105
1106static inline int nbp_vlan_delete(struct net_bridge_port *port, u16 vid)
1107{
1108 return -EOPNOTSUPP;
1109}
1110
1111static inline void nbp_vlan_flush(struct net_bridge_port *port)
1112{
1113}
1114
1115static inline struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg,
1116 u16 vid)
1117{
1118 return NULL;
1119}
1120
1121static inline int nbp_vlan_init(struct net_bridge_port *port,
1122 struct netlink_ext_ack *extack)
1123{
1124 return 0;
1125}
1126
1127static inline u16 br_vlan_get_tag(const struct sk_buff *skb, u16 *tag)
1128{
1129 return 0;
1130}
1131
1132static inline u16 br_get_pvid(const struct net_bridge_vlan_group *vg)
1133{
1134 return 0;
1135}
1136
1137static inline int __br_vlan_filter_toggle(struct net_bridge *br,
1138 unsigned long val)
1139{
1140 return -EOPNOTSUPP;
1141}
1142
1143static inline int nbp_get_num_vlan_infos(struct net_bridge_port *p,
1144 u32 filter_mask)
1145{
1146 return 0;
1147}
1148
1149static inline struct net_bridge_vlan_group *br_vlan_group(
1150 const struct net_bridge *br)
1151{
1152 return NULL;
1153}
1154
1155static inline struct net_bridge_vlan_group *nbp_vlan_group(
1156 const struct net_bridge_port *p)
1157{
1158 return NULL;
1159}
1160
1161static inline struct net_bridge_vlan_group *br_vlan_group_rcu(
1162 const struct net_bridge *br)
1163{
1164 return NULL;
1165}
1166
1167static inline struct net_bridge_vlan_group *nbp_vlan_group_rcu(
1168 const struct net_bridge_port *p)
1169{
1170 return NULL;
1171}
1172
1173static inline void br_vlan_get_stats(const struct net_bridge_vlan *v,
1174 struct br_vlan_stats *stats)
1175{
1176}
1177
1178static inline void br_vlan_port_event(struct net_bridge_port *p,
1179 unsigned long event)
1180{
1181}
1182
1183static inline int br_vlan_bridge_event(struct net_device *dev,
1184 unsigned long event, void *ptr)
1185{
1186 return 0;
1187}
1188
1189static inline void br_vlan_rtnl_init(void)
1190{
1191}
1192
1193static inline void br_vlan_rtnl_uninit(void)
1194{
1195}
1196
1197static inline void br_vlan_notify(const struct net_bridge *br,
1198 const struct net_bridge_port *p,
1199 u16 vid, u16 vid_range,
1200 int cmd)
1201{
1202}
1203
1204static inline bool br_vlan_can_enter_range(const struct net_bridge_vlan *v_curr,
1205 const struct net_bridge_vlan *range_end)
1206{
1207 return true;
1208}
1209#endif
1210
1211/* br_vlan_options.c */
1212#ifdef CONFIG_BRIDGE_VLAN_FILTERING
1213bool br_vlan_opts_eq_range(const struct net_bridge_vlan *v_curr,
1214 const struct net_bridge_vlan *range_end);
1215bool br_vlan_opts_fill(struct sk_buff *skb, const struct net_bridge_vlan *v);
1216size_t br_vlan_opts_nl_size(void);
1217int br_vlan_process_options(const struct net_bridge *br,
1218 const struct net_bridge_port *p,
1219 struct net_bridge_vlan *range_start,
1220 struct net_bridge_vlan *range_end,
1221 struct nlattr **tb,
1222 struct netlink_ext_ack *extack);
1223
1224/* vlan state manipulation helpers using *_ONCE to annotate lock-free access */
1225static inline u8 br_vlan_get_state(const struct net_bridge_vlan *v)
1226{
1227 return READ_ONCE(v->state);
1228}
1229
1230static inline void br_vlan_set_state(struct net_bridge_vlan *v, u8 state)
1231{
1232 WRITE_ONCE(v->state, state);
1233}
1234
1235static inline u8 br_vlan_get_pvid_state(const struct net_bridge_vlan_group *vg)
1236{
1237 return READ_ONCE(vg->pvid_state);
1238}
1239
1240static inline void br_vlan_set_pvid_state(struct net_bridge_vlan_group *vg,
1241 u8 state)
1242{
1243 WRITE_ONCE(vg->pvid_state, state);
1244}
1245
1246/* learn_allow is true at ingress and false at egress */
1247static inline bool br_vlan_state_allowed(u8 state, bool learn_allow)
1248{
1249 switch (state) {
1250 case BR_STATE_LEARNING:
1251 return learn_allow;
1252 case BR_STATE_FORWARDING:
1253 return true;
1254 default:
1255 return false;
1256 }
1257}
1258#endif
1259
1260struct nf_br_ops {
1261 int (*br_dev_xmit_hook)(struct sk_buff *skb);
1262};
1263extern const struct nf_br_ops __rcu *nf_br_ops;
1264
1265/* br_netfilter.c */
1266#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
1267int br_nf_core_init(void);
1268void br_nf_core_fini(void);
1269void br_netfilter_rtable_init(struct net_bridge *);
1270#else
1271static inline int br_nf_core_init(void) { return 0; }
1272static inline void br_nf_core_fini(void) {}
1273#define br_netfilter_rtable_init(x)
1274#endif
1275
1276/* br_stp.c */
1277void br_set_state(struct net_bridge_port *p, unsigned int state);
1278struct net_bridge_port *br_get_port(struct net_bridge *br, u16 port_no);
1279void br_init_port(struct net_bridge_port *p);
1280void br_become_designated_port(struct net_bridge_port *p);
1281
1282void __br_set_forward_delay(struct net_bridge *br, unsigned long t);
1283int br_set_forward_delay(struct net_bridge *br, unsigned long x);
1284int br_set_hello_time(struct net_bridge *br, unsigned long x);
1285int br_set_max_age(struct net_bridge *br, unsigned long x);
1286int __set_ageing_time(struct net_device *dev, unsigned long t);
1287int br_set_ageing_time(struct net_bridge *br, clock_t ageing_time);
1288
1289
1290/* br_stp_if.c */
1291void br_stp_enable_bridge(struct net_bridge *br);
1292void br_stp_disable_bridge(struct net_bridge *br);
1293int br_stp_set_enabled(struct net_bridge *br, unsigned long val,
1294 struct netlink_ext_ack *extack);
1295void br_stp_enable_port(struct net_bridge_port *p);
1296void br_stp_disable_port(struct net_bridge_port *p);
1297bool br_stp_recalculate_bridge_id(struct net_bridge *br);
1298void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *a);
1299void br_stp_set_bridge_priority(struct net_bridge *br, u16 newprio);
1300int br_stp_set_port_priority(struct net_bridge_port *p, unsigned long newprio);
1301int br_stp_set_path_cost(struct net_bridge_port *p, unsigned long path_cost);
1302ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id);
1303
1304/* br_stp_bpdu.c */
1305struct stp_proto;
1306void br_stp_rcv(const struct stp_proto *proto, struct sk_buff *skb,
1307 struct net_device *dev);
1308
1309/* br_stp_timer.c */
1310void br_stp_timer_init(struct net_bridge *br);
1311void br_stp_port_timer_init(struct net_bridge_port *p);
1312unsigned long br_timer_value(const struct timer_list *timer);
1313
1314/* br.c */
1315#if IS_ENABLED(CONFIG_ATM_LANE)
1316extern int (*br_fdb_test_addr_hook)(struct net_device *dev, unsigned char *addr);
1317#endif
1318
1319/* br_mrp.c */
1320#if IS_ENABLED(CONFIG_BRIDGE_MRP)
1321int br_mrp_parse(struct net_bridge *br, struct net_bridge_port *p,
1322 struct nlattr *attr, int cmd, struct netlink_ext_ack *extack);
1323int br_mrp_process(struct net_bridge_port *p, struct sk_buff *skb);
1324bool br_mrp_enabled(struct net_bridge *br);
1325void br_mrp_port_del(struct net_bridge *br, struct net_bridge_port *p);
1326int br_mrp_fill_info(struct sk_buff *skb, struct net_bridge *br);
1327#else
1328static inline int br_mrp_parse(struct net_bridge *br, struct net_bridge_port *p,
1329 struct nlattr *attr, int cmd,
1330 struct netlink_ext_ack *extack)
1331{
1332 return -EOPNOTSUPP;
1333}
1334
1335static inline int br_mrp_process(struct net_bridge_port *p, struct sk_buff *skb)
1336{
1337 return 0;
1338}
1339
1340static inline bool br_mrp_enabled(struct net_bridge *br)
1341{
1342 return false;
1343}
1344
1345static inline void br_mrp_port_del(struct net_bridge *br,
1346 struct net_bridge_port *p)
1347{
1348}
1349
1350static inline int br_mrp_fill_info(struct sk_buff *skb, struct net_bridge *br)
1351{
1352 return 0;
1353}
1354
1355#endif
1356
1357/* br_netlink.c */
1358extern struct rtnl_link_ops br_link_ops;
1359int br_netlink_init(void);
1360void br_netlink_fini(void);
1361void br_ifinfo_notify(int event, const struct net_bridge *br,
1362 const struct net_bridge_port *port);
1363int br_setlink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags,
1364 struct netlink_ext_ack *extack);
1365int br_dellink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags);
1366int br_getlink(struct sk_buff *skb, u32 pid, u32 seq, struct net_device *dev,
1367 u32 filter_mask, int nlflags);
1368int br_process_vlan_info(struct net_bridge *br,
1369 struct net_bridge_port *p, int cmd,
1370 struct bridge_vlan_info *vinfo_curr,
1371 struct bridge_vlan_info **vinfo_last,
1372 bool *changed,
1373 struct netlink_ext_ack *extack);
1374
1375#ifdef CONFIG_SYSFS
1376/* br_sysfs_if.c */
1377extern const struct sysfs_ops brport_sysfs_ops;
1378int br_sysfs_addif(struct net_bridge_port *p);
1379int br_sysfs_renameif(struct net_bridge_port *p);
1380
1381/* br_sysfs_br.c */
1382int br_sysfs_addbr(struct net_device *dev);
1383void br_sysfs_delbr(struct net_device *dev);
1384
1385#else
1386
1387static inline int br_sysfs_addif(struct net_bridge_port *p) { return 0; }
1388static inline int br_sysfs_renameif(struct net_bridge_port *p) { return 0; }
1389static inline int br_sysfs_addbr(struct net_device *dev) { return 0; }
1390static inline void br_sysfs_delbr(struct net_device *dev) { return; }
1391#endif /* CONFIG_SYSFS */
1392
1393/* br_switchdev.c */
1394#ifdef CONFIG_NET_SWITCHDEV
1395int nbp_switchdev_mark_set(struct net_bridge_port *p);
1396void nbp_switchdev_frame_mark(const struct net_bridge_port *p,
1397 struct sk_buff *skb);
1398bool nbp_switchdev_allowed_egress(const struct net_bridge_port *p,
1399 const struct sk_buff *skb);
1400int br_switchdev_set_port_flag(struct net_bridge_port *p,
1401 unsigned long flags,
1402 unsigned long mask);
1403void br_switchdev_fdb_notify(const struct net_bridge_fdb_entry *fdb,
1404 int type);
1405int br_switchdev_port_vlan_add(struct net_device *dev, u16 vid, u16 flags,
1406 struct netlink_ext_ack *extack);
1407int br_switchdev_port_vlan_del(struct net_device *dev, u16 vid);
1408
1409static inline void br_switchdev_frame_unmark(struct sk_buff *skb)
1410{
1411 skb->offload_fwd_mark = 0;
1412}
1413#else
1414static inline int nbp_switchdev_mark_set(struct net_bridge_port *p)
1415{
1416 return 0;
1417}
1418
1419static inline void nbp_switchdev_frame_mark(const struct net_bridge_port *p,
1420 struct sk_buff *skb)
1421{
1422}
1423
1424static inline bool nbp_switchdev_allowed_egress(const struct net_bridge_port *p,
1425 const struct sk_buff *skb)
1426{
1427 return true;
1428}
1429
1430static inline int br_switchdev_set_port_flag(struct net_bridge_port *p,
1431 unsigned long flags,
1432 unsigned long mask)
1433{
1434 return 0;
1435}
1436
1437static inline int br_switchdev_port_vlan_add(struct net_device *dev,
1438 u16 vid, u16 flags,
1439 struct netlink_ext_ack *extack)
1440{
1441 return -EOPNOTSUPP;
1442}
1443
1444static inline int br_switchdev_port_vlan_del(struct net_device *dev, u16 vid)
1445{
1446 return -EOPNOTSUPP;
1447}
1448
1449static inline void
1450br_switchdev_fdb_notify(const struct net_bridge_fdb_entry *fdb, int type)
1451{
1452}
1453
1454static inline void br_switchdev_frame_unmark(struct sk_buff *skb)
1455{
1456}
1457#endif /* CONFIG_NET_SWITCHDEV */
1458
1459/* br_arp_nd_proxy.c */
1460void br_recalculate_neigh_suppress_enabled(struct net_bridge *br);
1461void br_do_proxy_suppress_arp(struct sk_buff *skb, struct net_bridge *br,
1462 u16 vid, struct net_bridge_port *p);
1463void br_do_suppress_nd(struct sk_buff *skb, struct net_bridge *br,
1464 u16 vid, struct net_bridge_port *p, struct nd_msg *msg);
1465struct nd_msg *br_is_nd_neigh_msg(struct sk_buff *skb, struct nd_msg *m);
1466#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#include <net/ip6_fib.h>
22#include <linux/if_vlan.h>
23#include <linux/rhashtable.h>
24
25#define BR_HASH_BITS 8
26#define BR_HASH_SIZE (1 << BR_HASH_BITS)
27
28#define BR_HOLD_TIME (1*HZ)
29
30#define BR_PORT_BITS 10
31#define BR_MAX_PORTS (1<<BR_PORT_BITS)
32
33#define BR_VERSION "2.3"
34
35/* Control of forwarding link local multicast */
36#define BR_GROUPFWD_DEFAULT 0
37/* Don't allow forwarding of control protocols like STP, MAC PAUSE and LACP */
38#define BR_GROUPFWD_RESTRICTED 0x0007u
39/* The Nearest Customer Bridge Group Address, 01-80-C2-00-00-[00,0B,0C,0D,0F] */
40#define BR_GROUPFWD_8021AD 0xB801u
41
42/* Path to usermode spanning tree program */
43#define BR_STP_PROG "/sbin/bridge-stp"
44
45typedef struct bridge_id bridge_id;
46typedef struct mac_addr mac_addr;
47typedef __u16 port_id;
48
49struct bridge_id
50{
51 unsigned char prio[2];
52 unsigned char addr[ETH_ALEN];
53};
54
55struct mac_addr
56{
57 unsigned char addr[ETH_ALEN];
58};
59
60#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
61/* our own querier */
62struct bridge_mcast_own_query {
63 struct timer_list timer;
64 u32 startup_sent;
65};
66
67/* other querier */
68struct bridge_mcast_other_query {
69 struct timer_list timer;
70 unsigned long delay_time;
71};
72
73/* selected querier */
74struct bridge_mcast_querier {
75 struct br_ip addr;
76 struct net_bridge_port __rcu *port;
77};
78
79/* IGMP/MLD statistics */
80struct bridge_mcast_stats {
81 struct br_mcast_stats mstats;
82 struct u64_stats_sync syncp;
83};
84#endif
85
86struct br_vlan_stats {
87 u64 rx_bytes;
88 u64 rx_packets;
89 u64 tx_bytes;
90 u64 tx_packets;
91 struct u64_stats_sync syncp;
92};
93
94/**
95 * struct net_bridge_vlan - per-vlan entry
96 *
97 * @vnode: rhashtable member
98 * @vid: VLAN id
99 * @flags: bridge vlan flags
100 * @stats: per-cpu VLAN statistics
101 * @br: if MASTER flag set, this points to a bridge struct
102 * @port: if MASTER flag unset, this points to a port struct
103 * @refcnt: if MASTER flag set, this is bumped for each port referencing it
104 * @brvlan: if MASTER flag unset, this points to the global per-VLAN context
105 * for this VLAN entry
106 * @vlist: sorted list of VLAN entries
107 * @rcu: used for entry destruction
108 *
109 * This structure is shared between the global per-VLAN entries contained in
110 * the bridge rhashtable and the local per-port per-VLAN entries contained in
111 * the port's rhashtable. The union entries should be interpreted depending on
112 * the entry flags that are set.
113 */
114struct net_bridge_vlan {
115 struct rhash_head vnode;
116 u16 vid;
117 u16 flags;
118 struct br_vlan_stats __percpu *stats;
119 union {
120 struct net_bridge *br;
121 struct net_bridge_port *port;
122 };
123 union {
124 atomic_t refcnt;
125 struct net_bridge_vlan *brvlan;
126 };
127 struct list_head vlist;
128
129 struct rcu_head rcu;
130};
131
132/**
133 * struct net_bridge_vlan_group
134 *
135 * @vlan_hash: VLAN entry rhashtable
136 * @vlan_list: sorted VLAN entry list
137 * @num_vlans: number of total VLAN entries
138 * @pvid: PVID VLAN id
139 *
140 * IMPORTANT: Be careful when checking if there're VLAN entries using list
141 * primitives because the bridge can have entries in its list which
142 * are just for global context but not for filtering, i.e. they have
143 * the master flag set but not the brentry flag. If you have to check
144 * if there're "real" entries in the bridge please test @num_vlans
145 */
146struct net_bridge_vlan_group {
147 struct rhashtable vlan_hash;
148 struct list_head vlan_list;
149 u16 num_vlans;
150 u16 pvid;
151};
152
153struct net_bridge_fdb_entry
154{
155 struct hlist_node hlist;
156 struct net_bridge_port *dst;
157
158 unsigned long updated;
159 unsigned long used;
160 mac_addr addr;
161 __u16 vlan_id;
162 unsigned char is_local:1,
163 is_static:1,
164 added_by_user:1,
165 added_by_external_learn:1;
166 struct rcu_head rcu;
167};
168
169#define MDB_PG_FLAGS_PERMANENT BIT(0)
170#define MDB_PG_FLAGS_OFFLOAD BIT(1)
171
172struct net_bridge_port_group {
173 struct net_bridge_port *port;
174 struct net_bridge_port_group __rcu *next;
175 struct hlist_node mglist;
176 struct rcu_head rcu;
177 struct timer_list timer;
178 struct br_ip addr;
179 unsigned char flags;
180};
181
182struct net_bridge_mdb_entry
183{
184 struct hlist_node hlist[2];
185 struct net_bridge *br;
186 struct net_bridge_port_group __rcu *ports;
187 struct rcu_head rcu;
188 struct timer_list timer;
189 struct br_ip addr;
190 bool mglist;
191};
192
193struct net_bridge_mdb_htable
194{
195 struct hlist_head *mhash;
196 struct rcu_head rcu;
197 struct net_bridge_mdb_htable *old;
198 u32 size;
199 u32 max;
200 u32 secret;
201 u32 ver;
202};
203
204struct net_bridge_port
205{
206 struct net_bridge *br;
207 struct net_device *dev;
208 struct list_head list;
209
210 /* STP */
211 u8 priority;
212 u8 state;
213 u16 port_no;
214 unsigned char topology_change_ack;
215 unsigned char config_pending;
216 port_id port_id;
217 port_id designated_port;
218 bridge_id designated_root;
219 bridge_id designated_bridge;
220 u32 path_cost;
221 u32 designated_cost;
222 unsigned long designated_age;
223
224 struct timer_list forward_delay_timer;
225 struct timer_list hold_timer;
226 struct timer_list message_age_timer;
227 struct kobject kobj;
228 struct rcu_head rcu;
229
230 unsigned long flags;
231
232#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
233 struct bridge_mcast_own_query ip4_own_query;
234#if IS_ENABLED(CONFIG_IPV6)
235 struct bridge_mcast_own_query ip6_own_query;
236#endif /* IS_ENABLED(CONFIG_IPV6) */
237 unsigned char multicast_router;
238 struct bridge_mcast_stats __percpu *mcast_stats;
239 struct timer_list multicast_router_timer;
240 struct hlist_head mglist;
241 struct hlist_node rlist;
242#endif
243
244#ifdef CONFIG_SYSFS
245 char sysfs_name[IFNAMSIZ];
246#endif
247
248#ifdef CONFIG_NET_POLL_CONTROLLER
249 struct netpoll *np;
250#endif
251#ifdef CONFIG_BRIDGE_VLAN_FILTERING
252 struct net_bridge_vlan_group __rcu *vlgrp;
253#endif
254#ifdef CONFIG_NET_SWITCHDEV
255 int offload_fwd_mark;
256#endif
257};
258
259#define br_auto_port(p) ((p)->flags & BR_AUTO_MASK)
260#define br_promisc_port(p) ((p)->flags & BR_PROMISC)
261
262#define br_port_exists(dev) (dev->priv_flags & IFF_BRIDGE_PORT)
263
264static inline struct net_bridge_port *br_port_get_rcu(const struct net_device *dev)
265{
266 return rcu_dereference(dev->rx_handler_data);
267}
268
269static inline struct net_bridge_port *br_port_get_rtnl(const struct net_device *dev)
270{
271 return br_port_exists(dev) ?
272 rtnl_dereference(dev->rx_handler_data) : NULL;
273}
274
275struct net_bridge
276{
277 spinlock_t lock;
278 struct list_head port_list;
279 struct net_device *dev;
280
281 struct pcpu_sw_netstats __percpu *stats;
282 spinlock_t hash_lock;
283 struct hlist_head hash[BR_HASH_SIZE];
284#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
285 union {
286 struct rtable fake_rtable;
287 struct rt6_info fake_rt6_info;
288 };
289 bool nf_call_iptables;
290 bool nf_call_ip6tables;
291 bool nf_call_arptables;
292#endif
293 u16 group_fwd_mask;
294 u16 group_fwd_mask_required;
295
296 /* STP */
297 bridge_id designated_root;
298 bridge_id bridge_id;
299 u32 root_path_cost;
300 unsigned long max_age;
301 unsigned long hello_time;
302 unsigned long forward_delay;
303 unsigned long ageing_time;
304 unsigned long bridge_max_age;
305 unsigned long bridge_hello_time;
306 unsigned long bridge_forward_delay;
307 unsigned long bridge_ageing_time;
308
309 u8 group_addr[ETH_ALEN];
310 bool group_addr_set;
311 u16 root_port;
312
313 enum {
314 BR_NO_STP, /* no spanning tree */
315 BR_KERNEL_STP, /* old STP in kernel */
316 BR_USER_STP, /* new RSTP in userspace */
317 } stp_enabled;
318
319 unsigned char topology_change;
320 unsigned char topology_change_detected;
321
322#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
323 unsigned char multicast_router;
324
325 u8 multicast_disabled:1;
326 u8 multicast_querier:1;
327 u8 multicast_query_use_ifaddr:1;
328 u8 has_ipv6_addr:1;
329 u8 multicast_stats_enabled:1;
330
331 u32 hash_elasticity;
332 u32 hash_max;
333
334 u32 multicast_last_member_count;
335 u32 multicast_startup_query_count;
336
337 u8 multicast_igmp_version;
338
339 unsigned long multicast_last_member_interval;
340 unsigned long multicast_membership_interval;
341 unsigned long multicast_querier_interval;
342 unsigned long multicast_query_interval;
343 unsigned long multicast_query_response_interval;
344 unsigned long multicast_startup_query_interval;
345
346 spinlock_t multicast_lock;
347 struct net_bridge_mdb_htable __rcu *mdb;
348 struct hlist_head router_list;
349
350 struct timer_list multicast_router_timer;
351 struct bridge_mcast_other_query ip4_other_query;
352 struct bridge_mcast_own_query ip4_own_query;
353 struct bridge_mcast_querier ip4_querier;
354 struct bridge_mcast_stats __percpu *mcast_stats;
355#if IS_ENABLED(CONFIG_IPV6)
356 struct bridge_mcast_other_query ip6_other_query;
357 struct bridge_mcast_own_query ip6_own_query;
358 struct bridge_mcast_querier ip6_querier;
359 u8 multicast_mld_version;
360#endif /* IS_ENABLED(CONFIG_IPV6) */
361#endif
362
363 struct timer_list hello_timer;
364 struct timer_list tcn_timer;
365 struct timer_list topology_change_timer;
366 struct timer_list gc_timer;
367 struct kobject *ifobj;
368 u32 auto_cnt;
369
370#ifdef CONFIG_NET_SWITCHDEV
371 int offload_fwd_mark;
372#endif
373
374#ifdef CONFIG_BRIDGE_VLAN_FILTERING
375 struct net_bridge_vlan_group __rcu *vlgrp;
376 u8 vlan_enabled;
377 u8 vlan_stats_enabled;
378 __be16 vlan_proto;
379 u16 default_pvid;
380#endif
381};
382
383struct br_input_skb_cb {
384 struct net_device *brdev;
385
386#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
387 int igmp;
388 int mrouters_only;
389#endif
390
391 bool proxyarp_replied;
392
393#ifdef CONFIG_BRIDGE_VLAN_FILTERING
394 bool vlan_filtered;
395#endif
396
397#ifdef CONFIG_NET_SWITCHDEV
398 int offload_fwd_mark;
399#endif
400};
401
402#define BR_INPUT_SKB_CB(__skb) ((struct br_input_skb_cb *)(__skb)->cb)
403
404#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
405# define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb) (BR_INPUT_SKB_CB(__skb)->mrouters_only)
406#else
407# define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb) (0)
408#endif
409
410#define br_printk(level, br, format, args...) \
411 printk(level "%s: " format, (br)->dev->name, ##args)
412
413#define br_err(__br, format, args...) \
414 br_printk(KERN_ERR, __br, format, ##args)
415#define br_warn(__br, format, args...) \
416 br_printk(KERN_WARNING, __br, format, ##args)
417#define br_notice(__br, format, args...) \
418 br_printk(KERN_NOTICE, __br, format, ##args)
419#define br_info(__br, format, args...) \
420 br_printk(KERN_INFO, __br, format, ##args)
421
422#define br_debug(br, format, args...) \
423 pr_debug("%s: " format, (br)->dev->name, ##args)
424
425/* called under bridge lock */
426static inline int br_is_root_bridge(const struct net_bridge *br)
427{
428 return !memcmp(&br->bridge_id, &br->designated_root, 8);
429}
430
431/* check if a VLAN entry is global */
432static inline bool br_vlan_is_master(const struct net_bridge_vlan *v)
433{
434 return v->flags & BRIDGE_VLAN_INFO_MASTER;
435}
436
437/* check if a VLAN entry is used by the bridge */
438static inline bool br_vlan_is_brentry(const struct net_bridge_vlan *v)
439{
440 return v->flags & BRIDGE_VLAN_INFO_BRENTRY;
441}
442
443/* check if we should use the vlan entry, returns false if it's only context */
444static inline bool br_vlan_should_use(const struct net_bridge_vlan *v)
445{
446 if (br_vlan_is_master(v)) {
447 if (br_vlan_is_brentry(v))
448 return true;
449 else
450 return false;
451 }
452
453 return true;
454}
455
456/* br_device.c */
457void br_dev_setup(struct net_device *dev);
458void br_dev_delete(struct net_device *dev, struct list_head *list);
459netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev);
460#ifdef CONFIG_NET_POLL_CONTROLLER
461static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
462 struct sk_buff *skb)
463{
464 struct netpoll *np = p->np;
465
466 if (np)
467 netpoll_send_skb(np, skb);
468}
469
470int br_netpoll_enable(struct net_bridge_port *p);
471void br_netpoll_disable(struct net_bridge_port *p);
472#else
473static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
474 struct sk_buff *skb)
475{
476}
477
478static inline int br_netpoll_enable(struct net_bridge_port *p)
479{
480 return 0;
481}
482
483static inline void br_netpoll_disable(struct net_bridge_port *p)
484{
485}
486#endif
487
488/* br_fdb.c */
489int br_fdb_init(void);
490void br_fdb_fini(void);
491void br_fdb_flush(struct net_bridge *br);
492void br_fdb_find_delete_local(struct net_bridge *br,
493 const struct net_bridge_port *p,
494 const unsigned char *addr, u16 vid);
495void br_fdb_changeaddr(struct net_bridge_port *p, const unsigned char *newaddr);
496void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr);
497void br_fdb_cleanup(unsigned long arg);
498void br_fdb_delete_by_port(struct net_bridge *br,
499 const struct net_bridge_port *p, u16 vid, int do_all);
500struct net_bridge_fdb_entry *__br_fdb_get(struct net_bridge *br,
501 const unsigned char *addr, __u16 vid);
502int br_fdb_test_addr(struct net_device *dev, unsigned char *addr);
503int br_fdb_fillbuf(struct net_bridge *br, void *buf, unsigned long count,
504 unsigned long off);
505int br_fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
506 const unsigned char *addr, u16 vid);
507void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source,
508 const unsigned char *addr, u16 vid, bool added_by_user);
509
510int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
511 struct net_device *dev, const unsigned char *addr, u16 vid);
512int br_fdb_add(struct ndmsg *nlh, struct nlattr *tb[], struct net_device *dev,
513 const unsigned char *addr, u16 vid, u16 nlh_flags);
514int br_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
515 struct net_device *dev, struct net_device *fdev, int *idx);
516int br_fdb_sync_static(struct net_bridge *br, struct net_bridge_port *p);
517void br_fdb_unsync_static(struct net_bridge *br, struct net_bridge_port *p);
518int br_fdb_external_learn_add(struct net_bridge *br, struct net_bridge_port *p,
519 const unsigned char *addr, u16 vid);
520int br_fdb_external_learn_del(struct net_bridge *br, struct net_bridge_port *p,
521 const unsigned char *addr, u16 vid);
522
523/* br_forward.c */
524enum br_pkt_type {
525 BR_PKT_UNICAST,
526 BR_PKT_MULTICAST,
527 BR_PKT_BROADCAST
528};
529int br_dev_queue_push_xmit(struct net *net, struct sock *sk, struct sk_buff *skb);
530void br_forward(const struct net_bridge_port *to, struct sk_buff *skb,
531 bool local_rcv, bool local_orig);
532int br_forward_finish(struct net *net, struct sock *sk, struct sk_buff *skb);
533void br_flood(struct net_bridge *br, struct sk_buff *skb,
534 enum br_pkt_type pkt_type, bool local_rcv, bool local_orig);
535
536/* br_if.c */
537void br_port_carrier_check(struct net_bridge_port *p);
538int br_add_bridge(struct net *net, const char *name);
539int br_del_bridge(struct net *net, const char *name);
540int br_add_if(struct net_bridge *br, struct net_device *dev);
541int br_del_if(struct net_bridge *br, struct net_device *dev);
542int br_min_mtu(const struct net_bridge *br);
543netdev_features_t br_features_recompute(struct net_bridge *br,
544 netdev_features_t features);
545void br_port_flags_change(struct net_bridge_port *port, unsigned long mask);
546void br_manage_promisc(struct net_bridge *br);
547
548/* br_input.c */
549int br_handle_frame_finish(struct net *net, struct sock *sk, struct sk_buff *skb);
550rx_handler_result_t br_handle_frame(struct sk_buff **pskb);
551
552static inline bool br_rx_handler_check_rcu(const struct net_device *dev)
553{
554 return rcu_dereference(dev->rx_handler) == br_handle_frame;
555}
556
557static inline struct net_bridge_port *br_port_get_check_rcu(const struct net_device *dev)
558{
559 return br_rx_handler_check_rcu(dev) ? br_port_get_rcu(dev) : NULL;
560}
561
562/* br_ioctl.c */
563int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
564int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd,
565 void __user *arg);
566
567/* br_multicast.c */
568#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
569extern unsigned int br_mdb_rehash_seq;
570int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
571 struct sk_buff *skb, u16 vid);
572struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
573 struct sk_buff *skb, u16 vid);
574int br_multicast_add_port(struct net_bridge_port *port);
575void br_multicast_del_port(struct net_bridge_port *port);
576void br_multicast_enable_port(struct net_bridge_port *port);
577void br_multicast_disable_port(struct net_bridge_port *port);
578void br_multicast_init(struct net_bridge *br);
579void br_multicast_open(struct net_bridge *br);
580void br_multicast_stop(struct net_bridge *br);
581void br_multicast_dev_del(struct net_bridge *br);
582void br_multicast_flood(struct net_bridge_mdb_entry *mdst,
583 struct sk_buff *skb, bool local_rcv, bool local_orig);
584int br_multicast_set_router(struct net_bridge *br, unsigned long val);
585int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val);
586int br_multicast_toggle(struct net_bridge *br, unsigned long val);
587int br_multicast_set_querier(struct net_bridge *br, unsigned long val);
588int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val);
589int br_multicast_set_igmp_version(struct net_bridge *br, unsigned long val);
590#if IS_ENABLED(CONFIG_IPV6)
591int br_multicast_set_mld_version(struct net_bridge *br, unsigned long val);
592#endif
593struct net_bridge_mdb_entry *
594br_mdb_ip_get(struct net_bridge_mdb_htable *mdb, struct br_ip *dst);
595struct net_bridge_mdb_entry *
596br_multicast_new_group(struct net_bridge *br, struct net_bridge_port *port,
597 struct br_ip *group);
598void br_multicast_free_pg(struct rcu_head *head);
599struct net_bridge_port_group *
600br_multicast_new_port_group(struct net_bridge_port *port, struct br_ip *group,
601 struct net_bridge_port_group __rcu *next,
602 unsigned char flags);
603void br_mdb_init(void);
604void br_mdb_uninit(void);
605void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port,
606 struct br_ip *group, int type, u8 flags);
607void br_rtr_notify(struct net_device *dev, struct net_bridge_port *port,
608 int type);
609void br_multicast_count(struct net_bridge *br, const struct net_bridge_port *p,
610 const struct sk_buff *skb, u8 type, u8 dir);
611int br_multicast_init_stats(struct net_bridge *br);
612void br_multicast_get_stats(const struct net_bridge *br,
613 const struct net_bridge_port *p,
614 struct br_mcast_stats *dest);
615
616#define mlock_dereference(X, br) \
617 rcu_dereference_protected(X, lockdep_is_held(&br->multicast_lock))
618
619static inline bool br_multicast_is_router(struct net_bridge *br)
620{
621 return br->multicast_router == 2 ||
622 (br->multicast_router == 1 &&
623 timer_pending(&br->multicast_router_timer));
624}
625
626static inline bool
627__br_multicast_querier_exists(struct net_bridge *br,
628 struct bridge_mcast_other_query *querier,
629 const bool is_ipv6)
630{
631 bool own_querier_enabled;
632
633 if (br->multicast_querier) {
634 if (is_ipv6 && !br->has_ipv6_addr)
635 own_querier_enabled = false;
636 else
637 own_querier_enabled = true;
638 } else {
639 own_querier_enabled = false;
640 }
641
642 return time_is_before_jiffies(querier->delay_time) &&
643 (own_querier_enabled || timer_pending(&querier->timer));
644}
645
646static inline bool br_multicast_querier_exists(struct net_bridge *br,
647 struct ethhdr *eth)
648{
649 switch (eth->h_proto) {
650 case (htons(ETH_P_IP)):
651 return __br_multicast_querier_exists(br,
652 &br->ip4_other_query, false);
653#if IS_ENABLED(CONFIG_IPV6)
654 case (htons(ETH_P_IPV6)):
655 return __br_multicast_querier_exists(br,
656 &br->ip6_other_query, true);
657#endif
658 default:
659 return false;
660 }
661}
662
663static inline int br_multicast_igmp_type(const struct sk_buff *skb)
664{
665 return BR_INPUT_SKB_CB(skb)->igmp;
666}
667#else
668static inline int br_multicast_rcv(struct net_bridge *br,
669 struct net_bridge_port *port,
670 struct sk_buff *skb,
671 u16 vid)
672{
673 return 0;
674}
675
676static inline struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
677 struct sk_buff *skb, u16 vid)
678{
679 return NULL;
680}
681
682static inline int br_multicast_add_port(struct net_bridge_port *port)
683{
684 return 0;
685}
686
687static inline void br_multicast_del_port(struct net_bridge_port *port)
688{
689}
690
691static inline void br_multicast_enable_port(struct net_bridge_port *port)
692{
693}
694
695static inline void br_multicast_disable_port(struct net_bridge_port *port)
696{
697}
698
699static inline void br_multicast_init(struct net_bridge *br)
700{
701}
702
703static inline void br_multicast_open(struct net_bridge *br)
704{
705}
706
707static inline void br_multicast_stop(struct net_bridge *br)
708{
709}
710
711static inline void br_multicast_dev_del(struct net_bridge *br)
712{
713}
714
715static inline void br_multicast_flood(struct net_bridge_mdb_entry *mdst,
716 struct sk_buff *skb,
717 bool local_rcv, bool local_orig)
718{
719}
720
721static inline bool br_multicast_is_router(struct net_bridge *br)
722{
723 return 0;
724}
725
726static inline bool br_multicast_querier_exists(struct net_bridge *br,
727 struct ethhdr *eth)
728{
729 return false;
730}
731
732static inline void br_mdb_init(void)
733{
734}
735
736static inline void br_mdb_uninit(void)
737{
738}
739
740static inline void br_multicast_count(struct net_bridge *br,
741 const struct net_bridge_port *p,
742 const struct sk_buff *skb,
743 u8 type, u8 dir)
744{
745}
746
747static inline int br_multicast_init_stats(struct net_bridge *br)
748{
749 return 0;
750}
751
752static inline int br_multicast_igmp_type(const struct sk_buff *skb)
753{
754 return 0;
755}
756#endif
757
758/* br_vlan.c */
759#ifdef CONFIG_BRIDGE_VLAN_FILTERING
760bool br_allowed_ingress(const struct net_bridge *br,
761 struct net_bridge_vlan_group *vg, struct sk_buff *skb,
762 u16 *vid);
763bool br_allowed_egress(struct net_bridge_vlan_group *vg,
764 const struct sk_buff *skb);
765bool br_should_learn(struct net_bridge_port *p, struct sk_buff *skb, u16 *vid);
766struct sk_buff *br_handle_vlan(struct net_bridge *br,
767 struct net_bridge_vlan_group *vg,
768 struct sk_buff *skb);
769int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags);
770int br_vlan_delete(struct net_bridge *br, u16 vid);
771void br_vlan_flush(struct net_bridge *br);
772struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg, u16 vid);
773void br_recalculate_fwd_mask(struct net_bridge *br);
774int __br_vlan_filter_toggle(struct net_bridge *br, unsigned long val);
775int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val);
776int __br_vlan_set_proto(struct net_bridge *br, __be16 proto);
777int br_vlan_set_proto(struct net_bridge *br, unsigned long val);
778int br_vlan_set_stats(struct net_bridge *br, unsigned long val);
779int br_vlan_init(struct net_bridge *br);
780int br_vlan_set_default_pvid(struct net_bridge *br, unsigned long val);
781int __br_vlan_set_default_pvid(struct net_bridge *br, u16 pvid);
782int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags);
783int nbp_vlan_delete(struct net_bridge_port *port, u16 vid);
784void nbp_vlan_flush(struct net_bridge_port *port);
785int nbp_vlan_init(struct net_bridge_port *port);
786int nbp_get_num_vlan_infos(struct net_bridge_port *p, u32 filter_mask);
787void br_vlan_get_stats(const struct net_bridge_vlan *v,
788 struct br_vlan_stats *stats);
789
790static inline struct net_bridge_vlan_group *br_vlan_group(
791 const struct net_bridge *br)
792{
793 return rtnl_dereference(br->vlgrp);
794}
795
796static inline struct net_bridge_vlan_group *nbp_vlan_group(
797 const struct net_bridge_port *p)
798{
799 return rtnl_dereference(p->vlgrp);
800}
801
802static inline struct net_bridge_vlan_group *br_vlan_group_rcu(
803 const struct net_bridge *br)
804{
805 return rcu_dereference(br->vlgrp);
806}
807
808static inline struct net_bridge_vlan_group *nbp_vlan_group_rcu(
809 const struct net_bridge_port *p)
810{
811 return rcu_dereference(p->vlgrp);
812}
813
814/* Since bridge now depends on 8021Q module, but the time bridge sees the
815 * skb, the vlan tag will always be present if the frame was tagged.
816 */
817static inline int br_vlan_get_tag(const struct sk_buff *skb, u16 *vid)
818{
819 int err = 0;
820
821 if (skb_vlan_tag_present(skb)) {
822 *vid = skb_vlan_tag_get(skb) & VLAN_VID_MASK;
823 } else {
824 *vid = 0;
825 err = -EINVAL;
826 }
827
828 return err;
829}
830
831static inline u16 br_get_pvid(const struct net_bridge_vlan_group *vg)
832{
833 if (!vg)
834 return 0;
835
836 smp_rmb();
837 return vg->pvid;
838}
839
840static inline int br_vlan_enabled(struct net_bridge *br)
841{
842 return br->vlan_enabled;
843}
844#else
845static inline bool br_allowed_ingress(const struct net_bridge *br,
846 struct net_bridge_vlan_group *vg,
847 struct sk_buff *skb,
848 u16 *vid)
849{
850 return true;
851}
852
853static inline bool br_allowed_egress(struct net_bridge_vlan_group *vg,
854 const struct sk_buff *skb)
855{
856 return true;
857}
858
859static inline bool br_should_learn(struct net_bridge_port *p,
860 struct sk_buff *skb, u16 *vid)
861{
862 return true;
863}
864
865static inline struct sk_buff *br_handle_vlan(struct net_bridge *br,
866 struct net_bridge_vlan_group *vg,
867 struct sk_buff *skb)
868{
869 return skb;
870}
871
872static inline int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags)
873{
874 return -EOPNOTSUPP;
875}
876
877static inline int br_vlan_delete(struct net_bridge *br, u16 vid)
878{
879 return -EOPNOTSUPP;
880}
881
882static inline void br_vlan_flush(struct net_bridge *br)
883{
884}
885
886static inline void br_recalculate_fwd_mask(struct net_bridge *br)
887{
888}
889
890static inline int br_vlan_init(struct net_bridge *br)
891{
892 return 0;
893}
894
895static inline int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags)
896{
897 return -EOPNOTSUPP;
898}
899
900static inline int nbp_vlan_delete(struct net_bridge_port *port, u16 vid)
901{
902 return -EOPNOTSUPP;
903}
904
905static inline void nbp_vlan_flush(struct net_bridge_port *port)
906{
907}
908
909static inline struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg,
910 u16 vid)
911{
912 return NULL;
913}
914
915static inline int nbp_vlan_init(struct net_bridge_port *port)
916{
917 return 0;
918}
919
920static inline u16 br_vlan_get_tag(const struct sk_buff *skb, u16 *tag)
921{
922 return 0;
923}
924
925static inline u16 br_get_pvid(const struct net_bridge_vlan_group *vg)
926{
927 return 0;
928}
929
930static inline int br_vlan_enabled(struct net_bridge *br)
931{
932 return 0;
933}
934
935static inline int __br_vlan_filter_toggle(struct net_bridge *br,
936 unsigned long val)
937{
938 return -EOPNOTSUPP;
939}
940
941static inline int nbp_get_num_vlan_infos(struct net_bridge_port *p,
942 u32 filter_mask)
943{
944 return 0;
945}
946
947static inline struct net_bridge_vlan_group *br_vlan_group(
948 const struct net_bridge *br)
949{
950 return NULL;
951}
952
953static inline struct net_bridge_vlan_group *nbp_vlan_group(
954 const struct net_bridge_port *p)
955{
956 return NULL;
957}
958
959static inline struct net_bridge_vlan_group *br_vlan_group_rcu(
960 const struct net_bridge *br)
961{
962 return NULL;
963}
964
965static inline struct net_bridge_vlan_group *nbp_vlan_group_rcu(
966 const struct net_bridge_port *p)
967{
968 return NULL;
969}
970
971static inline void br_vlan_get_stats(const struct net_bridge_vlan *v,
972 struct br_vlan_stats *stats)
973{
974}
975#endif
976
977struct nf_br_ops {
978 int (*br_dev_xmit_hook)(struct sk_buff *skb);
979};
980extern const struct nf_br_ops __rcu *nf_br_ops;
981
982/* br_netfilter.c */
983#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
984int br_nf_core_init(void);
985void br_nf_core_fini(void);
986void br_netfilter_rtable_init(struct net_bridge *);
987#else
988static inline int br_nf_core_init(void) { return 0; }
989static inline void br_nf_core_fini(void) {}
990#define br_netfilter_rtable_init(x)
991#endif
992
993/* br_stp.c */
994void br_set_state(struct net_bridge_port *p, unsigned int state);
995struct net_bridge_port *br_get_port(struct net_bridge *br, u16 port_no);
996void br_init_port(struct net_bridge_port *p);
997void br_become_designated_port(struct net_bridge_port *p);
998
999void __br_set_forward_delay(struct net_bridge *br, unsigned long t);
1000int br_set_forward_delay(struct net_bridge *br, unsigned long x);
1001int br_set_hello_time(struct net_bridge *br, unsigned long x);
1002int br_set_max_age(struct net_bridge *br, unsigned long x);
1003int __set_ageing_time(struct net_device *dev, unsigned long t);
1004int br_set_ageing_time(struct net_bridge *br, clock_t ageing_time);
1005
1006
1007/* br_stp_if.c */
1008void br_stp_enable_bridge(struct net_bridge *br);
1009void br_stp_disable_bridge(struct net_bridge *br);
1010void br_stp_set_enabled(struct net_bridge *br, unsigned long val);
1011void br_stp_enable_port(struct net_bridge_port *p);
1012void br_stp_disable_port(struct net_bridge_port *p);
1013bool br_stp_recalculate_bridge_id(struct net_bridge *br);
1014void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *a);
1015void br_stp_set_bridge_priority(struct net_bridge *br, u16 newprio);
1016int br_stp_set_port_priority(struct net_bridge_port *p, unsigned long newprio);
1017int br_stp_set_path_cost(struct net_bridge_port *p, unsigned long path_cost);
1018ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id);
1019
1020/* br_stp_bpdu.c */
1021struct stp_proto;
1022void br_stp_rcv(const struct stp_proto *proto, struct sk_buff *skb,
1023 struct net_device *dev);
1024
1025/* br_stp_timer.c */
1026void br_stp_timer_init(struct net_bridge *br);
1027void br_stp_port_timer_init(struct net_bridge_port *p);
1028unsigned long br_timer_value(const struct timer_list *timer);
1029
1030/* br.c */
1031#if IS_ENABLED(CONFIG_ATM_LANE)
1032extern int (*br_fdb_test_addr_hook)(struct net_device *dev, unsigned char *addr);
1033#endif
1034
1035/* br_netlink.c */
1036extern struct rtnl_link_ops br_link_ops;
1037int br_netlink_init(void);
1038void br_netlink_fini(void);
1039void br_ifinfo_notify(int event, struct net_bridge_port *port);
1040int br_setlink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags);
1041int br_dellink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags);
1042int br_getlink(struct sk_buff *skb, u32 pid, u32 seq, struct net_device *dev,
1043 u32 filter_mask, int nlflags);
1044
1045#ifdef CONFIG_SYSFS
1046/* br_sysfs_if.c */
1047extern const struct sysfs_ops brport_sysfs_ops;
1048int br_sysfs_addif(struct net_bridge_port *p);
1049int br_sysfs_renameif(struct net_bridge_port *p);
1050
1051/* br_sysfs_br.c */
1052int br_sysfs_addbr(struct net_device *dev);
1053void br_sysfs_delbr(struct net_device *dev);
1054
1055#else
1056
1057static inline int br_sysfs_addif(struct net_bridge_port *p) { return 0; }
1058static inline int br_sysfs_renameif(struct net_bridge_port *p) { return 0; }
1059static inline int br_sysfs_addbr(struct net_device *dev) { return 0; }
1060static inline void br_sysfs_delbr(struct net_device *dev) { return; }
1061#endif /* CONFIG_SYSFS */
1062
1063/* br_switchdev.c */
1064#ifdef CONFIG_NET_SWITCHDEV
1065int nbp_switchdev_mark_set(struct net_bridge_port *p);
1066void nbp_switchdev_frame_mark(const struct net_bridge_port *p,
1067 struct sk_buff *skb);
1068bool nbp_switchdev_allowed_egress(const struct net_bridge_port *p,
1069 const struct sk_buff *skb);
1070#else
1071static inline int nbp_switchdev_mark_set(struct net_bridge_port *p)
1072{
1073 return 0;
1074}
1075
1076static inline void nbp_switchdev_frame_mark(const struct net_bridge_port *p,
1077 struct sk_buff *skb)
1078{
1079}
1080
1081static inline bool nbp_switchdev_allowed_egress(const struct net_bridge_port *p,
1082 const struct sk_buff *skb)
1083{
1084 return true;
1085}
1086#endif /* CONFIG_NET_SWITCHDEV */
1087
1088#endif