Commit | Line | Data |
---|---|---|
2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
2 | /* |
3 | * Forwarding database | |
4 | * Linux ethernet bridge | |
5 | * | |
6 | * Authors: | |
7 | * Lennert Buytenhek <buytenh@gnu.org> | |
1da177e4 LT |
8 | */ |
9 | ||
10 | #include <linux/kernel.h> | |
11 | #include <linux/init.h> | |
82524746 | 12 | #include <linux/rculist.h> |
1da177e4 LT |
13 | #include <linux/spinlock.h> |
14 | #include <linux/times.h> | |
15 | #include <linux/netdevice.h> | |
16 | #include <linux/etherdevice.h> | |
17 | #include <linux/jhash.h> | |
3f890923 | 18 | #include <linux/random.h> |
5a0e3ad6 | 19 | #include <linux/slab.h> |
60063497 | 20 | #include <linux/atomic.h> |
3f890923 | 21 | #include <asm/unaligned.h> |
2ba071ec | 22 | #include <linux/if_vlan.h> |
b4ad7baa | 23 | #include <net/switchdev.h> |
b74fd306 | 24 | #include <trace/events/bridge.h> |
1da177e4 LT |
25 | #include "br_private.h" |
26 | ||
eb793583 NA |
27 | static const struct rhashtable_params br_fdb_rht_params = { |
28 | .head_offset = offsetof(struct net_bridge_fdb_entry, rhnode), | |
29 | .key_offset = offsetof(struct net_bridge_fdb_entry, key), | |
30 | .key_len = sizeof(struct net_bridge_fdb_key), | |
31 | .automatic_shrinking = true, | |
eb793583 NA |
32 | }; |
33 | ||
e18b890b | 34 | static struct kmem_cache *br_fdb_cache __read_mostly; |
1da177e4 | 35 | |
87a596e0 | 36 | int __init br_fdb_init(void) |
1da177e4 LT |
37 | { |
38 | br_fdb_cache = kmem_cache_create("bridge_fdb_cache", | |
39 | sizeof(struct net_bridge_fdb_entry), | |
40 | 0, | |
20c2df83 | 41 | SLAB_HWCACHE_ALIGN, NULL); |
87a596e0 AM |
42 | if (!br_fdb_cache) |
43 | return -ENOMEM; | |
44 | ||
87a596e0 | 45 | return 0; |
1da177e4 LT |
46 | } |
47 | ||
73afc906 | 48 | void br_fdb_fini(void) |
1da177e4 LT |
49 | { |
50 | kmem_cache_destroy(br_fdb_cache); | |
51 | } | |
52 | ||
eb793583 NA |
53 | int br_fdb_hash_init(struct net_bridge *br) |
54 | { | |
55 | return rhashtable_init(&br->fdb_hash_tbl, &br_fdb_rht_params); | |
56 | } | |
57 | ||
58 | void br_fdb_hash_fini(struct net_bridge *br) | |
59 | { | |
60 | rhashtable_destroy(&br->fdb_hash_tbl); | |
61 | } | |
1da177e4 LT |
62 | |
63 | /* if topology_changing then use forward_delay (default 15 sec) | |
64 | * otherwise keep longer (default 5 minutes) | |
65 | */ | |
3f890923 | 66 | static inline unsigned long hold_time(const struct net_bridge *br) |
1da177e4 LT |
67 | { |
68 | return br->topology_change ? br->forward_delay : br->ageing_time; | |
69 | } | |
70 | ||
3f890923 | 71 | static inline int has_expired(const struct net_bridge *br, |
1da177e4 LT |
72 | const struct net_bridge_fdb_entry *fdb) |
73 | { | |
29e63fff | 74 | return !test_bit(BR_FDB_STATIC, &fdb->flags) && |
b5cd9f7c | 75 | !test_bit(BR_FDB_ADDED_BY_EXT_LEARN, &fdb->flags) && |
29e63fff | 76 | time_before_eq(fdb->updated + hold_time(br), jiffies); |
1da177e4 LT |
77 | } |
78 | ||
da678292 MM |
79 | static void fdb_rcu_free(struct rcu_head *head) |
80 | { | |
81 | struct net_bridge_fdb_entry *ent | |
82 | = container_of(head, struct net_bridge_fdb_entry, rcu); | |
83 | kmem_cache_free(br_fdb_cache, ent); | |
84 | } | |
85 | ||
4682048a VO |
86 | static int fdb_to_nud(const struct net_bridge *br, |
87 | const struct net_bridge_fdb_entry *fdb) | |
88 | { | |
89 | if (test_bit(BR_FDB_LOCAL, &fdb->flags)) | |
90 | return NUD_PERMANENT; | |
91 | else if (test_bit(BR_FDB_STATIC, &fdb->flags)) | |
92 | return NUD_NOARP; | |
93 | else if (has_expired(br, fdb)) | |
94 | return NUD_STALE; | |
95 | else | |
96 | return NUD_REACHABLE; | |
97 | } | |
98 | ||
99 | static int fdb_fill_info(struct sk_buff *skb, const struct net_bridge *br, | |
100 | const struct net_bridge_fdb_entry *fdb, | |
101 | u32 portid, u32 seq, int type, unsigned int flags) | |
102 | { | |
103 | const struct net_bridge_port *dst = READ_ONCE(fdb->dst); | |
104 | unsigned long now = jiffies; | |
105 | struct nda_cacheinfo ci; | |
106 | struct nlmsghdr *nlh; | |
107 | struct ndmsg *ndm; | |
108 | ||
109 | nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags); | |
110 | if (nlh == NULL) | |
111 | return -EMSGSIZE; | |
112 | ||
113 | ndm = nlmsg_data(nlh); | |
114 | ndm->ndm_family = AF_BRIDGE; | |
115 | ndm->ndm_pad1 = 0; | |
116 | ndm->ndm_pad2 = 0; | |
117 | ndm->ndm_flags = 0; | |
118 | ndm->ndm_type = 0; | |
119 | ndm->ndm_ifindex = dst ? dst->dev->ifindex : br->dev->ifindex; | |
120 | ndm->ndm_state = fdb_to_nud(br, fdb); | |
121 | ||
122 | if (test_bit(BR_FDB_OFFLOADED, &fdb->flags)) | |
123 | ndm->ndm_flags |= NTF_OFFLOADED; | |
124 | if (test_bit(BR_FDB_ADDED_BY_EXT_LEARN, &fdb->flags)) | |
125 | ndm->ndm_flags |= NTF_EXT_LEARNED; | |
126 | if (test_bit(BR_FDB_STICKY, &fdb->flags)) | |
127 | ndm->ndm_flags |= NTF_STICKY; | |
128 | ||
129 | if (nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->key.addr)) | |
130 | goto nla_put_failure; | |
131 | if (nla_put_u32(skb, NDA_MASTER, br->dev->ifindex)) | |
132 | goto nla_put_failure; | |
133 | ci.ndm_used = jiffies_to_clock_t(now - fdb->used); | |
134 | ci.ndm_confirmed = 0; | |
135 | ci.ndm_updated = jiffies_to_clock_t(now - fdb->updated); | |
136 | ci.ndm_refcnt = 0; | |
137 | if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci)) | |
138 | goto nla_put_failure; | |
139 | ||
140 | if (fdb->key.vlan_id && nla_put(skb, NDA_VLAN, sizeof(u16), | |
141 | &fdb->key.vlan_id)) | |
142 | goto nla_put_failure; | |
143 | ||
144 | if (test_bit(BR_FDB_NOTIFY, &fdb->flags)) { | |
145 | struct nlattr *nest = nla_nest_start(skb, NDA_FDB_EXT_ATTRS); | |
146 | u8 notify_bits = FDB_NOTIFY_BIT; | |
147 | ||
148 | if (!nest) | |
149 | goto nla_put_failure; | |
150 | if (test_bit(BR_FDB_NOTIFY_INACTIVE, &fdb->flags)) | |
151 | notify_bits |= FDB_NOTIFY_INACTIVE_BIT; | |
152 | ||
153 | if (nla_put_u8(skb, NFEA_ACTIVITY_NOTIFY, notify_bits)) { | |
154 | nla_nest_cancel(skb, nest); | |
155 | goto nla_put_failure; | |
156 | } | |
157 | ||
158 | nla_nest_end(skb, nest); | |
159 | } | |
160 | ||
161 | nlmsg_end(skb, nlh); | |
162 | return 0; | |
163 | ||
164 | nla_put_failure: | |
165 | nlmsg_cancel(skb, nlh); | |
166 | return -EMSGSIZE; | |
167 | } | |
168 | ||
169 | static inline size_t fdb_nlmsg_size(void) | |
170 | { | |
171 | return NLMSG_ALIGN(sizeof(struct ndmsg)) | |
172 | + nla_total_size(ETH_ALEN) /* NDA_LLADDR */ | |
173 | + nla_total_size(sizeof(u32)) /* NDA_MASTER */ | |
174 | + nla_total_size(sizeof(u16)) /* NDA_VLAN */ | |
175 | + nla_total_size(sizeof(struct nda_cacheinfo)) | |
176 | + nla_total_size(0) /* NDA_FDB_EXT_ATTRS */ | |
177 | + nla_total_size(sizeof(u8)); /* NFEA_ACTIVITY_NOTIFY */ | |
178 | } | |
179 | ||
180 | static void fdb_notify(struct net_bridge *br, | |
181 | const struct net_bridge_fdb_entry *fdb, int type, | |
182 | bool swdev_notify) | |
183 | { | |
184 | struct net *net = dev_net(br->dev); | |
185 | struct sk_buff *skb; | |
186 | int err = -ENOBUFS; | |
187 | ||
188 | if (swdev_notify) | |
189 | br_switchdev_fdb_notify(br, fdb, type); | |
190 | ||
191 | skb = nlmsg_new(fdb_nlmsg_size(), GFP_ATOMIC); | |
192 | if (skb == NULL) | |
193 | goto errout; | |
194 | ||
195 | err = fdb_fill_info(skb, br, fdb, 0, 0, type, 0); | |
196 | if (err < 0) { | |
197 | /* -EMSGSIZE implies BUG in fdb_nlmsg_size() */ | |
198 | WARN_ON(err == -EMSGSIZE); | |
199 | kfree_skb(skb); | |
200 | goto errout; | |
201 | } | |
202 | rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC); | |
203 | return; | |
204 | errout: | |
205 | rtnl_set_sk_err(net, RTNLGRP_NEIGH, err); | |
206 | } | |
207 | ||
eb793583 | 208 | static struct net_bridge_fdb_entry *fdb_find_rcu(struct rhashtable *tbl, |
bfd0aeac NA |
209 | const unsigned char *addr, |
210 | __u16 vid) | |
211 | { | |
eb793583 | 212 | struct net_bridge_fdb_key key; |
bfd0aeac | 213 | |
410b3d48 NA |
214 | WARN_ON_ONCE(!rcu_read_lock_held()); |
215 | ||
eb793583 NA |
216 | key.vlan_id = vid; |
217 | memcpy(key.addr.addr, addr, sizeof(key.addr.addr)); | |
bfd0aeac | 218 | |
eb793583 | 219 | return rhashtable_lookup(tbl, &key, br_fdb_rht_params); |
bfd0aeac NA |
220 | } |
221 | ||
222 | /* requires bridge hash_lock */ | |
223 | static struct net_bridge_fdb_entry *br_fdb_find(struct net_bridge *br, | |
224 | const unsigned char *addr, | |
225 | __u16 vid) | |
226 | { | |
bfd0aeac NA |
227 | struct net_bridge_fdb_entry *fdb; |
228 | ||
d12c9176 | 229 | lockdep_assert_held_once(&br->hash_lock); |
410b3d48 | 230 | |
bfd0aeac | 231 | rcu_read_lock(); |
eb793583 | 232 | fdb = fdb_find_rcu(&br->fdb_hash_tbl, addr, vid); |
bfd0aeac NA |
233 | rcu_read_unlock(); |
234 | ||
235 | return fdb; | |
236 | } | |
237 | ||
4d4fd361 PM |
238 | struct net_device *br_fdb_find_port(const struct net_device *br_dev, |
239 | const unsigned char *addr, | |
240 | __u16 vid) | |
241 | { | |
242 | struct net_bridge_fdb_entry *f; | |
243 | struct net_device *dev = NULL; | |
244 | struct net_bridge *br; | |
245 | ||
246 | ASSERT_RTNL(); | |
247 | ||
248 | if (!netif_is_bridge_master(br_dev)) | |
249 | return NULL; | |
250 | ||
251 | br = netdev_priv(br_dev); | |
873aca2e PM |
252 | rcu_read_lock(); |
253 | f = br_fdb_find_rcu(br, addr, vid); | |
4d4fd361 PM |
254 | if (f && f->dst) |
255 | dev = f->dst->dev; | |
873aca2e | 256 | rcu_read_unlock(); |
4d4fd361 PM |
257 | |
258 | return dev; | |
259 | } | |
260 | EXPORT_SYMBOL_GPL(br_fdb_find_port); | |
261 | ||
bfd0aeac NA |
262 | struct net_bridge_fdb_entry *br_fdb_find_rcu(struct net_bridge *br, |
263 | const unsigned char *addr, | |
264 | __u16 vid) | |
265 | { | |
eb793583 | 266 | return fdb_find_rcu(&br->fdb_hash_tbl, addr, vid); |
bfd0aeac NA |
267 | } |
268 | ||
145beee8 VY |
269 | /* When a static FDB entry is added, the mac address from the entry is |
270 | * added to the bridge private HW address list and all required ports | |
271 | * are then updated with the new information. | |
272 | * Called under RTNL. | |
273 | */ | |
020ec6ba | 274 | static void fdb_add_hw_addr(struct net_bridge *br, const unsigned char *addr) |
145beee8 VY |
275 | { |
276 | int err; | |
a3f5ee71 | 277 | struct net_bridge_port *p; |
145beee8 VY |
278 | |
279 | ASSERT_RTNL(); | |
280 | ||
281 | list_for_each_entry(p, &br->port_list, list) { | |
282 | if (!br_promisc_port(p)) { | |
283 | err = dev_uc_add(p->dev, addr); | |
284 | if (err) | |
285 | goto undo; | |
286 | } | |
287 | } | |
288 | ||
289 | return; | |
290 | undo: | |
a3f5ee71 LR |
291 | list_for_each_entry_continue_reverse(p, &br->port_list, list) { |
292 | if (!br_promisc_port(p)) | |
293 | dev_uc_del(p->dev, addr); | |
145beee8 VY |
294 | } |
295 | } | |
296 | ||
297 | /* When a static FDB entry is deleted, the HW address from that entry is | |
298 | * also removed from the bridge private HW address list and updates all | |
299 | * the ports with needed information. | |
300 | * Called under RTNL. | |
301 | */ | |
020ec6ba | 302 | static void fdb_del_hw_addr(struct net_bridge *br, const unsigned char *addr) |
145beee8 VY |
303 | { |
304 | struct net_bridge_port *p; | |
305 | ||
306 | ASSERT_RTNL(); | |
307 | ||
308 | list_for_each_entry(p, &br->port_list, list) { | |
309 | if (!br_promisc_port(p)) | |
310 | dev_uc_del(p->dev, addr); | |
311 | } | |
312 | } | |
313 | ||
161d82de PM |
314 | static void fdb_delete(struct net_bridge *br, struct net_bridge_fdb_entry *f, |
315 | bool swdev_notify) | |
1da177e4 | 316 | { |
b74fd306 RP |
317 | trace_fdb_delete(br, f); |
318 | ||
29e63fff | 319 | if (test_bit(BR_FDB_STATIC, &f->flags)) |
eb793583 | 320 | fdb_del_hw_addr(br, f->key.addr.addr); |
145beee8 | 321 | |
eb793583 NA |
322 | hlist_del_init_rcu(&f->fdb_node); |
323 | rhashtable_remove_fast(&br->fdb_hash_tbl, &f->rhnode, | |
324 | br_fdb_rht_params); | |
161d82de | 325 | fdb_notify(br, f, RTM_DELNEIGH, swdev_notify); |
da678292 | 326 | call_rcu(&f->rcu, fdb_rcu_free); |
1da177e4 LT |
327 | } |
328 | ||
960b589f TM |
329 | /* Delete a local entry if no other port had the same address. */ |
330 | static void fdb_delete_local(struct net_bridge *br, | |
331 | const struct net_bridge_port *p, | |
332 | struct net_bridge_fdb_entry *f) | |
333 | { | |
eb793583 | 334 | const unsigned char *addr = f->key.addr.addr; |
2594e906 NA |
335 | struct net_bridge_vlan_group *vg; |
336 | const struct net_bridge_vlan *v; | |
960b589f | 337 | struct net_bridge_port *op; |
eb793583 | 338 | u16 vid = f->key.vlan_id; |
960b589f TM |
339 | |
340 | /* Maybe another port has same hw addr? */ | |
341 | list_for_each_entry(op, &br->port_list, list) { | |
2594e906 | 342 | vg = nbp_vlan_group(op); |
960b589f | 343 | if (op != p && ether_addr_equal(op->dev->dev_addr, addr) && |
2594e906 | 344 | (!vid || br_vlan_find(vg, vid))) { |
960b589f | 345 | f->dst = op; |
ac3ca6af | 346 | clear_bit(BR_FDB_ADDED_BY_USER, &f->flags); |
960b589f TM |
347 | return; |
348 | } | |
349 | } | |
350 | ||
2594e906 NA |
351 | vg = br_vlan_group(br); |
352 | v = br_vlan_find(vg, vid); | |
960b589f TM |
353 | /* Maybe bridge device has same hw addr? */ |
354 | if (p && ether_addr_equal(br->dev->dev_addr, addr) && | |
2594e906 | 355 | (!vid || (v && br_vlan_should_use(v)))) { |
960b589f | 356 | f->dst = NULL; |
ac3ca6af | 357 | clear_bit(BR_FDB_ADDED_BY_USER, &f->flags); |
960b589f TM |
358 | return; |
359 | } | |
360 | ||
161d82de | 361 | fdb_delete(br, f, true); |
960b589f TM |
362 | } |
363 | ||
424bb9c9 TM |
364 | void br_fdb_find_delete_local(struct net_bridge *br, |
365 | const struct net_bridge_port *p, | |
366 | const unsigned char *addr, u16 vid) | |
367 | { | |
424bb9c9 TM |
368 | struct net_bridge_fdb_entry *f; |
369 | ||
370 | spin_lock_bh(&br->hash_lock); | |
bfd0aeac | 371 | f = br_fdb_find(br, addr, vid); |
6869c3b0 | 372 | if (f && test_bit(BR_FDB_LOCAL, &f->flags) && |
ac3ca6af | 373 | !test_bit(BR_FDB_ADDED_BY_USER, &f->flags) && f->dst == p) |
424bb9c9 TM |
374 | fdb_delete_local(br, p, f); |
375 | spin_unlock_bh(&br->hash_lock); | |
376 | } | |
377 | ||
5f94a5e2 VO |
378 | static struct net_bridge_fdb_entry *fdb_create(struct net_bridge *br, |
379 | struct net_bridge_port *source, | |
380 | const unsigned char *addr, | |
381 | __u16 vid, | |
382 | unsigned long flags) | |
383 | { | |
384 | struct net_bridge_fdb_entry *fdb; | |
385 | ||
386 | fdb = kmem_cache_alloc(br_fdb_cache, GFP_ATOMIC); | |
387 | if (fdb) { | |
388 | memcpy(fdb->key.addr.addr, addr, ETH_ALEN); | |
389 | WRITE_ONCE(fdb->dst, source); | |
390 | fdb->key.vlan_id = vid; | |
391 | fdb->flags = flags; | |
392 | fdb->updated = fdb->used = jiffies; | |
393 | if (rhashtable_lookup_insert_fast(&br->fdb_hash_tbl, | |
394 | &fdb->rhnode, | |
395 | br_fdb_rht_params)) { | |
396 | kmem_cache_free(br_fdb_cache, fdb); | |
397 | fdb = NULL; | |
398 | } else { | |
399 | hlist_add_head_rcu(&fdb->fdb_node, &br->fdb_list); | |
400 | } | |
401 | } | |
402 | return fdb; | |
403 | } | |
404 | ||
4731b6d6 VO |
405 | static int fdb_add_local(struct net_bridge *br, struct net_bridge_port *source, |
406 | const unsigned char *addr, u16 vid) | |
5f94a5e2 VO |
407 | { |
408 | struct net_bridge_fdb_entry *fdb; | |
409 | ||
410 | if (!is_valid_ether_addr(addr)) | |
411 | return -EINVAL; | |
412 | ||
413 | fdb = br_fdb_find(br, addr, vid); | |
414 | if (fdb) { | |
415 | /* it is okay to have multiple ports with same | |
416 | * address, just use the first one. | |
417 | */ | |
418 | if (test_bit(BR_FDB_LOCAL, &fdb->flags)) | |
419 | return 0; | |
420 | br_warn(br, "adding interface %s with same address as a received packet (addr:%pM, vlan:%u)\n", | |
421 | source ? source->dev->name : br->dev->name, addr, vid); | |
422 | fdb_delete(br, fdb, true); | |
423 | } | |
424 | ||
425 | fdb = fdb_create(br, source, addr, vid, | |
426 | BIT(BR_FDB_LOCAL) | BIT(BR_FDB_STATIC)); | |
427 | if (!fdb) | |
428 | return -ENOMEM; | |
429 | ||
430 | fdb_add_hw_addr(br, addr); | |
431 | fdb_notify(br, fdb, RTM_NEWNEIGH, true); | |
432 | return 0; | |
433 | } | |
434 | ||
1da177e4 LT |
435 | void br_fdb_changeaddr(struct net_bridge_port *p, const unsigned char *newaddr) |
436 | { | |
2594e906 | 437 | struct net_bridge_vlan_group *vg; |
eb793583 | 438 | struct net_bridge_fdb_entry *f; |
1da177e4 | 439 | struct net_bridge *br = p->br; |
2594e906 | 440 | struct net_bridge_vlan *v; |
9d6f229f | 441 | |
1da177e4 | 442 | spin_lock_bh(&br->hash_lock); |
2594e906 | 443 | vg = nbp_vlan_group(p); |
eb793583 | 444 | hlist_for_each_entry(f, &br->fdb_list, fdb_node) { |
6869c3b0 | 445 | if (f->dst == p && test_bit(BR_FDB_LOCAL, &f->flags) && |
ac3ca6af | 446 | !test_bit(BR_FDB_ADDED_BY_USER, &f->flags)) { |
eb793583 NA |
447 | /* delete old one */ |
448 | fdb_delete_local(br, p, f); | |
449 | ||
450 | /* if this port has no vlan information | |
451 | * configured, we can safely be done at | |
452 | * this point. | |
453 | */ | |
454 | if (!vg || !vg->num_vlans) | |
455 | goto insert; | |
1da177e4 LT |
456 | } |
457 | } | |
1da177e4 | 458 | |
2836882f TM |
459 | insert: |
460 | /* insert new address, may fail if invalid address or dup. */ | |
4731b6d6 | 461 | fdb_add_local(br, p, newaddr, 0); |
2836882f | 462 | |
2594e906 | 463 | if (!vg || !vg->num_vlans) |
2836882f TM |
464 | goto done; |
465 | ||
466 | /* Now add entries for every VLAN configured on the port. | |
467 | * This function runs under RTNL so the bitmap will not change | |
468 | * from under us. | |
469 | */ | |
2594e906 | 470 | list_for_each_entry(v, &vg->vlan_list, vlist) |
4731b6d6 | 471 | fdb_add_local(br, p, newaddr, v->vid); |
2836882f | 472 | |
bc9a25d2 | 473 | done: |
1da177e4 LT |
474 | spin_unlock_bh(&br->hash_lock); |
475 | } | |
476 | ||
43598813 | 477 | void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr) |
478 | { | |
2594e906 | 479 | struct net_bridge_vlan_group *vg; |
43598813 | 480 | struct net_bridge_fdb_entry *f; |
2594e906 | 481 | struct net_bridge_vlan *v; |
43598813 | 482 | |
ac4c8868 TM |
483 | spin_lock_bh(&br->hash_lock); |
484 | ||
43598813 | 485 | /* If old entry was unassociated with any port, then delete it. */ |
bfd0aeac | 486 | f = br_fdb_find(br, br->dev->dev_addr, 0); |
6869c3b0 | 487 | if (f && test_bit(BR_FDB_LOCAL, &f->flags) && |
ac3ca6af | 488 | !f->dst && !test_bit(BR_FDB_ADDED_BY_USER, &f->flags)) |
960b589f | 489 | fdb_delete_local(br, NULL, f); |
43598813 | 490 | |
4731b6d6 | 491 | fdb_add_local(br, NULL, newaddr, 0); |
2594e906 NA |
492 | vg = br_vlan_group(br); |
493 | if (!vg || !vg->num_vlans) | |
494 | goto out; | |
bc9a25d2 VY |
495 | /* Now remove and add entries for every VLAN configured on the |
496 | * bridge. This function runs under RTNL so the bitmap will not | |
497 | * change from under us. | |
498 | */ | |
2594e906 | 499 | list_for_each_entry(v, &vg->vlan_list, vlist) { |
0b148def TM |
500 | if (!br_vlan_should_use(v)) |
501 | continue; | |
bfd0aeac | 502 | f = br_fdb_find(br, br->dev->dev_addr, v->vid); |
6869c3b0 | 503 | if (f && test_bit(BR_FDB_LOCAL, &f->flags) && |
ac3ca6af | 504 | !f->dst && !test_bit(BR_FDB_ADDED_BY_USER, &f->flags)) |
960b589f | 505 | fdb_delete_local(br, NULL, f); |
4731b6d6 | 506 | fdb_add_local(br, NULL, newaddr, v->vid); |
bc9a25d2 | 507 | } |
ac4c8868 TM |
508 | out: |
509 | spin_unlock_bh(&br->hash_lock); | |
43598813 | 510 | } |
511 | ||
f7cdee8a | 512 | void br_fdb_cleanup(struct work_struct *work) |
1da177e4 | 513 | { |
f7cdee8a NA |
514 | struct net_bridge *br = container_of(work, struct net_bridge, |
515 | gc_work.work); | |
eb793583 | 516 | struct net_bridge_fdb_entry *f = NULL; |
1da177e4 | 517 | unsigned long delay = hold_time(br); |
f7cdee8a NA |
518 | unsigned long work_delay = delay; |
519 | unsigned long now = jiffies; | |
1da177e4 | 520 | |
eb793583 NA |
521 | /* this part is tricky, in order to avoid blocking learning and |
522 | * consequently forwarding, we rely on rcu to delete objects with | |
523 | * delayed freeing allowing us to continue traversing | |
524 | */ | |
525 | rcu_read_lock(); | |
526 | hlist_for_each_entry_rcu(f, &br->fdb_list, fdb_node) { | |
31cbc39b | 527 | unsigned long this_timer = f->updated + delay; |
1da177e4 | 528 | |
29e63fff | 529 | if (test_bit(BR_FDB_STATIC, &f->flags) || |
31cbc39b NA |
530 | test_bit(BR_FDB_ADDED_BY_EXT_LEARN, &f->flags)) { |
531 | if (test_bit(BR_FDB_NOTIFY, &f->flags)) { | |
532 | if (time_after(this_timer, now)) | |
533 | work_delay = min(work_delay, | |
534 | this_timer - now); | |
535 | else if (!test_and_set_bit(BR_FDB_NOTIFY_INACTIVE, | |
536 | &f->flags)) | |
537 | fdb_notify(br, f, RTM_NEWNEIGH, false); | |
538 | } | |
f7cdee8a | 539 | continue; |
31cbc39b NA |
540 | } |
541 | ||
eb793583 NA |
542 | if (time_after(this_timer, now)) { |
543 | work_delay = min(work_delay, this_timer - now); | |
544 | } else { | |
545 | spin_lock_bh(&br->hash_lock); | |
546 | if (!hlist_unhashed(&f->fdb_node)) | |
161d82de | 547 | fdb_delete(br, f, true); |
eb793583 | 548 | spin_unlock_bh(&br->hash_lock); |
1da177e4 LT |
549 | } |
550 | } | |
eb793583 | 551 | rcu_read_unlock(); |
1da177e4 | 552 | |
f7cdee8a NA |
553 | /* Cleanup minimum 10 milliseconds apart */ |
554 | work_delay = max_t(unsigned long, work_delay, msecs_to_jiffies(10)); | |
555 | mod_delayed_work(system_long_wq, &br->gc_work, work_delay); | |
1da177e4 LT |
556 | } |
557 | ||
9cf63747 SH |
558 | /* Completely flush all dynamic entries in forwarding database.*/ |
559 | void br_fdb_flush(struct net_bridge *br) | |
560 | { | |
eb793583 NA |
561 | struct net_bridge_fdb_entry *f; |
562 | struct hlist_node *tmp; | |
9cf63747 SH |
563 | |
564 | spin_lock_bh(&br->hash_lock); | |
eb793583 | 565 | hlist_for_each_entry_safe(f, tmp, &br->fdb_list, fdb_node) { |
29e63fff | 566 | if (!test_bit(BR_FDB_STATIC, &f->flags)) |
161d82de | 567 | fdb_delete(br, f, true); |
9cf63747 SH |
568 | } |
569 | spin_unlock_bh(&br->hash_lock); | |
570 | } | |
1a620698 | 571 | |
25985edc | 572 | /* Flush all entries referring to a specific port. |
9cf63747 | 573 | * if do_all is set also flush static entries |
1ea2d020 | 574 | * if vid is set delete all entries that match the vlan_id |
9cf63747 | 575 | */ |
1a620698 SH |
576 | void br_fdb_delete_by_port(struct net_bridge *br, |
577 | const struct net_bridge_port *p, | |
1ea2d020 | 578 | u16 vid, |
1a620698 | 579 | int do_all) |
1da177e4 | 580 | { |
eb793583 NA |
581 | struct net_bridge_fdb_entry *f; |
582 | struct hlist_node *tmp; | |
1da177e4 LT |
583 | |
584 | spin_lock_bh(&br->hash_lock); | |
eb793583 NA |
585 | hlist_for_each_entry_safe(f, tmp, &br->fdb_list, fdb_node) { |
586 | if (f->dst != p) | |
587 | continue; | |
9d6f229f | 588 | |
eb793583 | 589 | if (!do_all) |
29e63fff | 590 | if (test_bit(BR_FDB_STATIC, &f->flags) || |
f2f3729f NA |
591 | (test_bit(BR_FDB_ADDED_BY_EXT_LEARN, &f->flags) && |
592 | !test_bit(BR_FDB_OFFLOADED, &f->flags)) || | |
29e63fff | 593 | (vid && f->key.vlan_id != vid)) |
1da177e4 LT |
594 | continue; |
595 | ||
6869c3b0 | 596 | if (test_bit(BR_FDB_LOCAL, &f->flags)) |
eb793583 NA |
597 | fdb_delete_local(br, p, f); |
598 | else | |
161d82de | 599 | fdb_delete(br, f, true); |
1da177e4 LT |
600 | } |
601 | spin_unlock_bh(&br->hash_lock); | |
602 | } | |
603 | ||
e6373c4c | 604 | #if IS_ENABLED(CONFIG_ATM_LANE) |
da678292 MM |
605 | /* Interface used by ATM LANE hook to test |
606 | * if an addr is on some other bridge port */ | |
607 | int br_fdb_test_addr(struct net_device *dev, unsigned char *addr) | |
1da177e4 LT |
608 | { |
609 | struct net_bridge_fdb_entry *fdb; | |
b5ed54e9 | 610 | struct net_bridge_port *port; |
da678292 MM |
611 | int ret; |
612 | ||
1da177e4 | 613 | rcu_read_lock(); |
b5ed54e9 | 614 | port = br_port_get_rcu(dev); |
615 | if (!port) | |
616 | ret = 0; | |
617 | else { | |
3e19ae7c VO |
618 | const struct net_bridge_port *dst = NULL; |
619 | ||
bfd0aeac | 620 | fdb = br_fdb_find_rcu(port->br, addr, 0); |
3e19ae7c VO |
621 | if (fdb) |
622 | dst = READ_ONCE(fdb->dst); | |
623 | ||
624 | ret = dst && dst->dev != dev && | |
625 | dst->state == BR_STATE_FORWARDING; | |
b5ed54e9 | 626 | } |
1da177e4 | 627 | rcu_read_unlock(); |
1da177e4 | 628 | |
da678292 | 629 | return ret; |
1da177e4 | 630 | } |
da678292 | 631 | #endif /* CONFIG_ATM_LANE */ |
1da177e4 LT |
632 | |
633 | /* | |
9d6f229f | 634 | * Fill buffer with forwarding table records in |
1da177e4 LT |
635 | * the API format. |
636 | */ | |
637 | int br_fdb_fillbuf(struct net_bridge *br, void *buf, | |
638 | unsigned long maxnum, unsigned long skip) | |
639 | { | |
1da177e4 | 640 | struct net_bridge_fdb_entry *f; |
eb793583 NA |
641 | struct __fdb_entry *fe = buf; |
642 | int num = 0; | |
1da177e4 LT |
643 | |
644 | memset(buf, 0, maxnum*sizeof(struct __fdb_entry)); | |
645 | ||
646 | rcu_read_lock(); | |
eb793583 NA |
647 | hlist_for_each_entry_rcu(f, &br->fdb_list, fdb_node) { |
648 | if (num >= maxnum) | |
649 | break; | |
1da177e4 | 650 | |
eb793583 NA |
651 | if (has_expired(br, f)) |
652 | continue; | |
1da177e4 | 653 | |
eb793583 NA |
654 | /* ignore pseudo entry for local MAC address */ |
655 | if (!f->dst) | |
656 | continue; | |
43598813 | 657 | |
eb793583 NA |
658 | if (skip) { |
659 | --skip; | |
660 | continue; | |
661 | } | |
1da177e4 | 662 | |
eb793583 NA |
663 | /* convert from internal format to API */ |
664 | memcpy(fe->mac_addr, f->key.addr.addr, ETH_ALEN); | |
ae4f8fca | 665 | |
eb793583 NA |
666 | /* due to ABI compat need to split into hi/lo */ |
667 | fe->port_no = f->dst->port_no; | |
668 | fe->port_hi = f->dst->port_no >> 8; | |
ae4f8fca | 669 | |
6869c3b0 | 670 | fe->is_local = test_bit(BR_FDB_LOCAL, &f->flags); |
29e63fff | 671 | if (!test_bit(BR_FDB_STATIC, &f->flags)) |
eb793583 NA |
672 | fe->ageing_timer_value = jiffies_delta_to_clock_t(jiffies - f->updated); |
673 | ++fe; | |
674 | ++num; | |
1da177e4 | 675 | } |
1da177e4 LT |
676 | rcu_read_unlock(); |
677 | ||
678 | return num; | |
679 | } | |
680 | ||
03e9b64b | 681 | /* Add entry for local address of interface */ |
1da177e4 | 682 | int br_fdb_insert(struct net_bridge *br, struct net_bridge_port *source, |
bc9a25d2 | 683 | const unsigned char *addr, u16 vid) |
1da177e4 LT |
684 | { |
685 | int ret; | |
686 | ||
687 | spin_lock_bh(&br->hash_lock); | |
4731b6d6 | 688 | ret = fdb_add_local(br, source, addr, vid); |
1da177e4 LT |
689 | spin_unlock_bh(&br->hash_lock); |
690 | return ret; | |
691 | } | |
692 | ||
31cbc39b NA |
693 | /* returns true if the fdb was modified */ |
694 | static bool __fdb_mark_active(struct net_bridge_fdb_entry *fdb) | |
695 | { | |
696 | return !!(test_bit(BR_FDB_NOTIFY_INACTIVE, &fdb->flags) && | |
697 | test_and_clear_bit(BR_FDB_NOTIFY_INACTIVE, &fdb->flags)); | |
698 | } | |
699 | ||
1da177e4 | 700 | void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source, |
be0c5677 | 701 | const unsigned char *addr, u16 vid, unsigned long flags) |
1da177e4 | 702 | { |
1da177e4 LT |
703 | struct net_bridge_fdb_entry *fdb; |
704 | ||
705 | /* some users want to always flood. */ | |
706 | if (hold_time(br) == 0) | |
707 | return; | |
708 | ||
eb793583 | 709 | fdb = fdb_find_rcu(&br->fdb_hash_tbl, addr, vid); |
1da177e4 LT |
710 | if (likely(fdb)) { |
711 | /* attempt to update an entry for a local interface */ | |
6869c3b0 | 712 | if (unlikely(test_bit(BR_FDB_LOCAL, &fdb->flags))) { |
9d6f229f | 713 | if (net_ratelimit()) |
de1dfeef RP |
714 | br_warn(br, "received packet on %s with own address as source address (addr:%pM, vlan:%u)\n", |
715 | source->dev->name, addr, vid); | |
1da177e4 | 716 | } else { |
ca6d4480 | 717 | unsigned long now = jiffies; |
31cbc39b NA |
718 | bool fdb_modified = false; |
719 | ||
720 | if (now != fdb->updated) { | |
721 | fdb->updated = now; | |
722 | fdb_modified = __fdb_mark_active(fdb); | |
723 | } | |
ca6d4480 | 724 | |
1da177e4 | 725 | /* fastpath: update of existing entry */ |
3e19ae7c | 726 | if (unlikely(source != READ_ONCE(fdb->dst) && |
e0458d9a | 727 | !test_bit(BR_FDB_STICKY, &fdb->flags))) { |
6eb38bf8 | 728 | br_switchdev_fdb_notify(br, fdb, RTM_DELNEIGH); |
3e19ae7c | 729 | WRITE_ONCE(fdb->dst, source); |
c65c7a30 | 730 | fdb_modified = true; |
58073b32 | 731 | /* Take over HW learned entry */ |
58ec1ea6 NA |
732 | if (unlikely(test_bit(BR_FDB_ADDED_BY_EXT_LEARN, |
733 | &fdb->flags))) | |
734 | clear_bit(BR_FDB_ADDED_BY_EXT_LEARN, | |
735 | &fdb->flags); | |
c65c7a30 | 736 | } |
31cbc39b | 737 | |
be0c5677 | 738 | if (unlikely(test_bit(BR_FDB_ADDED_BY_USER, &flags))) |
ac3ca6af | 739 | set_bit(BR_FDB_ADDED_BY_USER, &fdb->flags); |
e3cfddd5 | 740 | if (unlikely(fdb_modified)) { |
be0c5677 | 741 | trace_br_fdb_update(br, source, addr, vid, flags); |
161d82de | 742 | fdb_notify(br, fdb, RTM_NEWNEIGH, true); |
e3cfddd5 | 743 | } |
1da177e4 LT |
744 | } |
745 | } else { | |
f8ae737d | 746 | spin_lock(&br->hash_lock); |
be0c5677 | 747 | fdb = fdb_create(br, source, addr, vid, flags); |
eb793583 | 748 | if (fdb) { |
be0c5677 | 749 | trace_br_fdb_update(br, source, addr, vid, flags); |
161d82de | 750 | fdb_notify(br, fdb, RTM_NEWNEIGH, true); |
f58ee4e1 | 751 | } |
1da177e4 LT |
752 | /* else we lose race and someone else inserts |
753 | * it first, don't bother updating | |
754 | */ | |
f8ae737d | 755 | spin_unlock(&br->hash_lock); |
1da177e4 | 756 | } |
1da177e4 | 757 | } |
b078f0df | 758 | |
b4454bc6 | 759 | static int br_fdb_replay_one(struct net_bridge *br, struct notifier_block *nb, |
bdf123b4 | 760 | const struct net_bridge_fdb_entry *fdb, |
b4454bc6 | 761 | unsigned long action, const void *ctx) |
04846f90 | 762 | { |
b4454bc6 | 763 | const struct net_bridge_port *p = READ_ONCE(fdb->dst); |
04846f90 VO |
764 | struct switchdev_notifier_fdb_info item; |
765 | int err; | |
766 | ||
767 | item.addr = fdb->key.addr.addr; | |
768 | item.vid = fdb->key.vlan_id; | |
769 | item.added_by_user = test_bit(BR_FDB_ADDED_BY_USER, &fdb->flags); | |
770 | item.offloaded = test_bit(BR_FDB_OFFLOADED, &fdb->flags); | |
e887b2df | 771 | item.is_local = test_bit(BR_FDB_LOCAL, &fdb->flags); |
2e19bb35 | 772 | item.info.dev = (!p || item.is_local) ? br->dev : p->dev; |
0d2cfbd4 | 773 | item.info.ctx = ctx; |
04846f90 | 774 | |
7e8c1858 | 775 | err = nb->notifier_call(nb, action, &item); |
04846f90 VO |
776 | return notifier_to_errno(err); |
777 | } | |
778 | ||
b4454bc6 VO |
779 | int br_fdb_replay(const struct net_device *br_dev, const void *ctx, bool adding, |
780 | struct notifier_block *nb) | |
04846f90 VO |
781 | { |
782 | struct net_bridge_fdb_entry *fdb; | |
783 | struct net_bridge *br; | |
7e8c1858 | 784 | unsigned long action; |
04846f90 VO |
785 | int err = 0; |
786 | ||
7105b50b VO |
787 | if (!nb) |
788 | return 0; | |
789 | ||
f851a721 VO |
790 | if (!netif_is_bridge_master(br_dev)) |
791 | return -EINVAL; | |
792 | ||
04846f90 VO |
793 | br = netdev_priv(br_dev); |
794 | ||
7e8c1858 VO |
795 | if (adding) |
796 | action = SWITCHDEV_FDB_ADD_TO_DEVICE; | |
797 | else | |
798 | action = SWITCHDEV_FDB_DEL_TO_DEVICE; | |
799 | ||
04846f90 VO |
800 | rcu_read_lock(); |
801 | ||
802 | hlist_for_each_entry_rcu(fdb, &br->fdb_list, fdb_node) { | |
b4454bc6 | 803 | err = br_fdb_replay_one(br, nb, fdb, action, ctx); |
04846f90 VO |
804 | if (err) |
805 | break; | |
806 | } | |
807 | ||
808 | rcu_read_unlock(); | |
809 | ||
810 | return err; | |
811 | } | |
04846f90 | 812 | |
b078f0df | 813 | /* Dump information about entries, in response to GETNEIGH */ |
77162022 JF |
814 | int br_fdb_dump(struct sk_buff *skb, |
815 | struct netlink_callback *cb, | |
816 | struct net_device *dev, | |
5d5eacb3 | 817 | struct net_device *filter_dev, |
d297653d | 818 | int *idx) |
b078f0df | 819 | { |
77162022 | 820 | struct net_bridge *br = netdev_priv(dev); |
eb793583 | 821 | struct net_bridge_fdb_entry *f; |
d297653d | 822 | int err = 0; |
b078f0df | 823 | |
254ec036 | 824 | if (!netif_is_bridge_master(dev)) |
eb793583 | 825 | return err; |
b078f0df | 826 | |
d297653d RP |
827 | if (!filter_dev) { |
828 | err = ndo_dflt_fdb_dump(skb, cb, dev, NULL, idx); | |
829 | if (err < 0) | |
eb793583 | 830 | return err; |
d297653d | 831 | } |
6cb69742 | 832 | |
eb793583 NA |
833 | rcu_read_lock(); |
834 | hlist_for_each_entry_rcu(f, &br->fdb_list, fdb_node) { | |
835 | if (*idx < cb->args[2]) | |
836 | goto skip; | |
837 | if (filter_dev && (!f->dst || f->dst->dev != filter_dev)) { | |
838 | if (filter_dev != dev) | |
77162022 | 839 | goto skip; |
eb793583 NA |
840 | /* !f->dst is a special case for bridge |
841 | * It means the MAC belongs to the bridge | |
842 | * Therefore need a little more filtering | |
843 | * we only want to dump the !f->dst case | |
844 | */ | |
845 | if (f->dst) | |
6cb69742 | 846 | goto skip; |
b078f0df | 847 | } |
eb793583 NA |
848 | if (!filter_dev && f->dst) |
849 | goto skip; | |
850 | ||
851 | err = fdb_fill_info(skb, br, f, | |
852 | NETLINK_CB(cb->skb).portid, | |
853 | cb->nlh->nlmsg_seq, | |
854 | RTM_NEWNEIGH, | |
855 | NLM_F_MULTI); | |
856 | if (err < 0) | |
857 | break; | |
858 | skip: | |
859 | *idx += 1; | |
b078f0df | 860 | } |
eb793583 | 861 | rcu_read_unlock(); |
b078f0df | 862 | |
d297653d | 863 | return err; |
b078f0df | 864 | } |
36fd2b63 | 865 | |
47674562 RP |
866 | int br_fdb_get(struct sk_buff *skb, |
867 | struct nlattr *tb[], | |
868 | struct net_device *dev, | |
869 | const unsigned char *addr, | |
870 | u16 vid, u32 portid, u32 seq, | |
871 | struct netlink_ext_ack *extack) | |
872 | { | |
873 | struct net_bridge *br = netdev_priv(dev); | |
874 | struct net_bridge_fdb_entry *f; | |
875 | int err = 0; | |
876 | ||
877 | rcu_read_lock(); | |
878 | f = br_fdb_find_rcu(br, addr, vid); | |
879 | if (!f) { | |
880 | NL_SET_ERR_MSG(extack, "Fdb entry not found"); | |
881 | err = -ENOENT; | |
882 | goto errout; | |
883 | } | |
884 | ||
885 | err = fdb_fill_info(skb, br, f, portid, seq, | |
886 | RTM_NEWNEIGH, 0); | |
887 | errout: | |
888 | rcu_read_unlock(); | |
889 | return err; | |
890 | } | |
891 | ||
31cbc39b NA |
892 | /* returns true if the fdb is modified */ |
893 | static bool fdb_handle_notify(struct net_bridge_fdb_entry *fdb, u8 notify) | |
894 | { | |
895 | bool modified = false; | |
896 | ||
897 | /* allow to mark an entry as inactive, usually done on creation */ | |
898 | if ((notify & FDB_NOTIFY_INACTIVE_BIT) && | |
899 | !test_and_set_bit(BR_FDB_NOTIFY_INACTIVE, &fdb->flags)) | |
900 | modified = true; | |
901 | ||
902 | if ((notify & FDB_NOTIFY_BIT) && | |
903 | !test_and_set_bit(BR_FDB_NOTIFY, &fdb->flags)) { | |
904 | /* enabled activity tracking */ | |
905 | modified = true; | |
906 | } else if (!(notify & FDB_NOTIFY_BIT) && | |
907 | test_and_clear_bit(BR_FDB_NOTIFY, &fdb->flags)) { | |
908 | /* disabled activity tracking, clear notify state */ | |
909 | clear_bit(BR_FDB_NOTIFY_INACTIVE, &fdb->flags); | |
910 | modified = true; | |
911 | } | |
912 | ||
913 | return modified; | |
914 | } | |
915 | ||
292d1398 | 916 | /* Update (create or replace) forwarding database entry */ |
7bb90c37 | 917 | static int fdb_add_entry(struct net_bridge *br, struct net_bridge_port *source, |
31cbc39b NA |
918 | const u8 *addr, struct ndmsg *ndm, u16 flags, u16 vid, |
919 | struct nlattr *nfea_tb[]) | |
36fd2b63 | 920 | { |
0592ff88 | 921 | bool is_sticky = !!(ndm->ndm_flags & NTF_STICKY); |
b5f1d9ec | 922 | bool refresh = !nfea_tb[NFEA_DONT_REFRESH]; |
36fd2b63 | 923 | struct net_bridge_fdb_entry *fdb; |
0592ff88 | 924 | u16 state = ndm->ndm_state; |
b0a397fb | 925 | bool modified = false; |
31cbc39b | 926 | u8 notify = 0; |
36fd2b63 | 927 | |
eb8d7baa | 928 | /* If the port cannot learn allow only local and static entries */ |
7bb90c37 | 929 | if (source && !(state & NUD_PERMANENT) && !(state & NUD_NOARP) && |
eb8d7baa WK |
930 | !(source->state == BR_STATE_LEARNING || |
931 | source->state == BR_STATE_FORWARDING)) | |
932 | return -EPERM; | |
933 | ||
7bb90c37 TM |
934 | if (!source && !(state & NUD_PERMANENT)) { |
935 | pr_info("bridge: RTM_NEWNEIGH %s without NUD_PERMANENT\n", | |
936 | br->dev->name); | |
937 | return -EINVAL; | |
938 | } | |
939 | ||
435f2e7c NA |
940 | if (is_sticky && (state & NUD_PERMANENT)) |
941 | return -EINVAL; | |
942 | ||
31cbc39b NA |
943 | if (nfea_tb[NFEA_ACTIVITY_NOTIFY]) { |
944 | notify = nla_get_u8(nfea_tb[NFEA_ACTIVITY_NOTIFY]); | |
945 | if ((notify & ~BR_FDB_NOTIFY_SETTABLE_BITS) || | |
946 | (notify & BR_FDB_NOTIFY_SETTABLE_BITS) == FDB_NOTIFY_INACTIVE_BIT) | |
947 | return -EINVAL; | |
948 | } | |
949 | ||
bfd0aeac | 950 | fdb = br_fdb_find(br, addr, vid); |
64af1bac | 951 | if (fdb == NULL) { |
952 | if (!(flags & NLM_F_CREATE)) | |
953 | return -ENOENT; | |
36fd2b63 | 954 | |
3fb01a31 | 955 | fdb = fdb_create(br, source, addr, vid, 0); |
64af1bac | 956 | if (!fdb) |
957 | return -ENOMEM; | |
b0a397fb | 958 | |
959 | modified = true; | |
64af1bac | 960 | } else { |
961 | if (flags & NLM_F_EXCL) | |
962 | return -EEXIST; | |
b0a397fb | 963 | |
3e19ae7c VO |
964 | if (READ_ONCE(fdb->dst) != source) { |
965 | WRITE_ONCE(fdb->dst, source); | |
b0a397fb | 966 | modified = true; |
967 | } | |
292d1398 | 968 | } |
969 | ||
3741873b | 970 | if (fdb_to_nud(br, fdb) != state) { |
145beee8 | 971 | if (state & NUD_PERMANENT) { |
6869c3b0 | 972 | set_bit(BR_FDB_LOCAL, &fdb->flags); |
29e63fff | 973 | if (!test_and_set_bit(BR_FDB_STATIC, &fdb->flags)) |
020ec6ba | 974 | fdb_add_hw_addr(br, addr); |
145beee8 | 975 | } else if (state & NUD_NOARP) { |
6869c3b0 | 976 | clear_bit(BR_FDB_LOCAL, &fdb->flags); |
29e63fff | 977 | if (!test_and_set_bit(BR_FDB_STATIC, &fdb->flags)) |
020ec6ba | 978 | fdb_add_hw_addr(br, addr); |
145beee8 | 979 | } else { |
6869c3b0 | 980 | clear_bit(BR_FDB_LOCAL, &fdb->flags); |
29e63fff | 981 | if (test_and_clear_bit(BR_FDB_STATIC, &fdb->flags)) |
020ec6ba | 982 | fdb_del_hw_addr(br, addr); |
145beee8 | 983 | } |
64af1bac | 984 | |
b0a397fb | 985 | modified = true; |
986 | } | |
435f2e7c | 987 | |
e0458d9a NA |
988 | if (is_sticky != test_bit(BR_FDB_STICKY, &fdb->flags)) { |
989 | change_bit(BR_FDB_STICKY, &fdb->flags); | |
435f2e7c NA |
990 | modified = true; |
991 | } | |
992 | ||
31cbc39b NA |
993 | if (fdb_handle_notify(fdb, notify)) |
994 | modified = true; | |
995 | ||
ac3ca6af | 996 | set_bit(BR_FDB_ADDED_BY_USER, &fdb->flags); |
b0a397fb | 997 | |
998 | fdb->used = jiffies; | |
999 | if (modified) { | |
b5f1d9ec NA |
1000 | if (refresh) |
1001 | fdb->updated = jiffies; | |
161d82de | 1002 | fdb_notify(br, fdb, RTM_NEWNEIGH, true); |
64af1bac | 1003 | } |
36fd2b63 | 1004 | |
36fd2b63 | 1005 | return 0; |
1006 | } | |
1007 | ||
7bb90c37 TM |
1008 | static int __br_fdb_add(struct ndmsg *ndm, struct net_bridge *br, |
1009 | struct net_bridge_port *p, const unsigned char *addr, | |
0541a629 VO |
1010 | u16 nlh_flags, u16 vid, struct nlattr *nfea_tb[], |
1011 | struct netlink_ext_ack *extack) | |
1690be63 VY |
1012 | { |
1013 | int err = 0; | |
1014 | ||
1015 | if (ndm->ndm_flags & NTF_USE) { | |
7bb90c37 TM |
1016 | if (!p) { |
1017 | pr_info("bridge: RTM_NEWNEIGH %s with NTF_USE is not supported\n", | |
1018 | br->dev->name); | |
1019 | return -EINVAL; | |
1020 | } | |
5d1fcaf3 NA |
1021 | if (!nbp_state_should_learn(p)) |
1022 | return 0; | |
1023 | ||
c4c832f8 | 1024 | local_bh_disable(); |
1690be63 | 1025 | rcu_read_lock(); |
be0c5677 | 1026 | br_fdb_update(br, p, addr, vid, BIT(BR_FDB_ADDED_BY_USER)); |
1690be63 | 1027 | rcu_read_unlock(); |
c4c832f8 | 1028 | local_bh_enable(); |
eb100e0e | 1029 | } else if (ndm->ndm_flags & NTF_EXT_LEARNED) { |
0541a629 VO |
1030 | if (!p && !(ndm->ndm_state & NUD_PERMANENT)) { |
1031 | NL_SET_ERR_MSG_MOD(extack, | |
1032 | "FDB entry towards bridge must be permanent"); | |
1033 | return -EINVAL; | |
1034 | } | |
45a68787 | 1035 | err = br_fdb_external_learn_add(br, p, addr, vid, true); |
1690be63 | 1036 | } else { |
7bb90c37 | 1037 | spin_lock_bh(&br->hash_lock); |
31cbc39b | 1038 | err = fdb_add_entry(br, p, addr, ndm, nlh_flags, vid, nfea_tb); |
7bb90c37 | 1039 | spin_unlock_bh(&br->hash_lock); |
1690be63 VY |
1040 | } |
1041 | ||
1042 | return err; | |
1043 | } | |
1044 | ||
31cbc39b NA |
1045 | static const struct nla_policy br_nda_fdb_pol[NFEA_MAX + 1] = { |
1046 | [NFEA_ACTIVITY_NOTIFY] = { .type = NLA_U8 }, | |
b5f1d9ec | 1047 | [NFEA_DONT_REFRESH] = { .type = NLA_FLAG }, |
31cbc39b NA |
1048 | }; |
1049 | ||
36fd2b63 | 1050 | /* Add new permanent fdb entry with RTM_NEWNEIGH */ |
edc7d573 | 1051 | int br_fdb_add(struct ndmsg *ndm, struct nlattr *tb[], |
1052 | struct net_device *dev, | |
87b0984e PM |
1053 | const unsigned char *addr, u16 vid, u16 nlh_flags, |
1054 | struct netlink_ext_ack *extack) | |
36fd2b63 | 1055 | { |
31cbc39b | 1056 | struct nlattr *nfea_tb[NFEA_MAX + 1], *attr; |
2594e906 | 1057 | struct net_bridge_vlan_group *vg; |
3741873b | 1058 | struct net_bridge_port *p = NULL; |
2594e906 | 1059 | struct net_bridge_vlan *v; |
3741873b | 1060 | struct net_bridge *br = NULL; |
77162022 | 1061 | int err = 0; |
36fd2b63 | 1062 | |
b74fd306 RP |
1063 | trace_br_fdb_add(ndm, dev, addr, vid, nlh_flags); |
1064 | ||
292d1398 | 1065 | if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_NOARP|NUD_REACHABLE))) { |
1066 | pr_info("bridge: RTM_NEWNEIGH with invalid state %#x\n", ndm->ndm_state); | |
1067 | return -EINVAL; | |
1068 | } | |
1069 | ||
537f7f84 SH |
1070 | if (is_zero_ether_addr(addr)) { |
1071 | pr_info("bridge: RTM_NEWNEIGH with invalid ether address\n"); | |
1072 | return -EINVAL; | |
1073 | } | |
1074 | ||
254ec036 | 1075 | if (netif_is_bridge_master(dev)) { |
3741873b RP |
1076 | br = netdev_priv(dev); |
1077 | vg = br_vlan_group(br); | |
1078 | } else { | |
1079 | p = br_port_get_rtnl(dev); | |
1080 | if (!p) { | |
1081 | pr_info("bridge: RTM_NEWNEIGH %s not a bridge port\n", | |
1082 | dev->name); | |
1083 | return -EINVAL; | |
1084 | } | |
7bb90c37 | 1085 | br = p->br; |
3741873b | 1086 | vg = nbp_vlan_group(p); |
36fd2b63 | 1087 | } |
1088 | ||
31cbc39b NA |
1089 | if (tb[NDA_FDB_EXT_ATTRS]) { |
1090 | attr = tb[NDA_FDB_EXT_ATTRS]; | |
1091 | err = nla_parse_nested(nfea_tb, NFEA_MAX, attr, | |
1092 | br_nda_fdb_pol, extack); | |
1093 | if (err) | |
1094 | return err; | |
1095 | } else { | |
1096 | memset(nfea_tb, 0, sizeof(struct nlattr *) * (NFEA_MAX + 1)); | |
1097 | } | |
1098 | ||
f6f6424b | 1099 | if (vid) { |
2594e906 | 1100 | v = br_vlan_find(vg, vid); |
3741873b RP |
1101 | if (!v || !br_vlan_should_use(v)) { |
1102 | pr_info("bridge: RTM_NEWNEIGH with unconfigured vlan %d on %s\n", vid, dev->name); | |
1690be63 VY |
1103 | return -EINVAL; |
1104 | } | |
1105 | ||
1106 | /* VID was specified, so use it. */ | |
0541a629 VO |
1107 | err = __br_fdb_add(ndm, br, p, addr, nlh_flags, vid, nfea_tb, |
1108 | extack); | |
292d1398 | 1109 | } else { |
0541a629 VO |
1110 | err = __br_fdb_add(ndm, br, p, addr, nlh_flags, 0, nfea_tb, |
1111 | extack); | |
2594e906 | 1112 | if (err || !vg || !vg->num_vlans) |
1690be63 | 1113 | goto out; |
1690be63 VY |
1114 | |
1115 | /* We have vlans configured on this port and user didn't | |
1116 | * specify a VLAN. To be nice, add/update entry for every | |
1117 | * vlan on this port. | |
1118 | */ | |
2594e906 | 1119 | list_for_each_entry(v, &vg->vlan_list, vlist) { |
3741873b RP |
1120 | if (!br_vlan_should_use(v)) |
1121 | continue; | |
31cbc39b | 1122 | err = __br_fdb_add(ndm, br, p, addr, nlh_flags, v->vid, |
0541a629 | 1123 | nfea_tb, extack); |
1690be63 VY |
1124 | if (err) |
1125 | goto out; | |
1690be63 | 1126 | } |
292d1398 | 1127 | } |
36fd2b63 | 1128 | |
1690be63 | 1129 | out: |
36fd2b63 | 1130 | return err; |
1131 | } | |
1132 | ||
5019ab50 NA |
1133 | static int fdb_delete_by_addr_and_port(struct net_bridge *br, |
1134 | const struct net_bridge_port *p, | |
8c86f967 | 1135 | const u8 *addr, u16 vlan) |
36fd2b63 | 1136 | { |
36fd2b63 | 1137 | struct net_bridge_fdb_entry *fdb; |
1138 | ||
bfd0aeac | 1139 | fdb = br_fdb_find(br, addr, vlan); |
3e19ae7c | 1140 | if (!fdb || READ_ONCE(fdb->dst) != p) |
36fd2b63 | 1141 | return -ENOENT; |
1142 | ||
161d82de | 1143 | fdb_delete(br, fdb, true); |
5019ab50 | 1144 | |
36fd2b63 | 1145 | return 0; |
1146 | } | |
1147 | ||
5019ab50 NA |
1148 | static int __br_fdb_delete(struct net_bridge *br, |
1149 | const struct net_bridge_port *p, | |
1690be63 VY |
1150 | const unsigned char *addr, u16 vid) |
1151 | { | |
1152 | int err; | |
1153 | ||
5019ab50 NA |
1154 | spin_lock_bh(&br->hash_lock); |
1155 | err = fdb_delete_by_addr_and_port(br, p, addr, vid); | |
1156 | spin_unlock_bh(&br->hash_lock); | |
1690be63 VY |
1157 | |
1158 | return err; | |
1159 | } | |
1160 | ||
36fd2b63 | 1161 | /* Remove neighbor entry with RTM_DELNEIGH */ |
1690be63 VY |
1162 | int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[], |
1163 | struct net_device *dev, | |
f6f6424b | 1164 | const unsigned char *addr, u16 vid) |
36fd2b63 | 1165 | { |
2594e906 | 1166 | struct net_bridge_vlan_group *vg; |
3741873b | 1167 | struct net_bridge_port *p = NULL; |
2594e906 | 1168 | struct net_bridge_vlan *v; |
5019ab50 | 1169 | struct net_bridge *br; |
36fd2b63 | 1170 | int err; |
1690be63 | 1171 | |
254ec036 | 1172 | if (netif_is_bridge_master(dev)) { |
3741873b RP |
1173 | br = netdev_priv(dev); |
1174 | vg = br_vlan_group(br); | |
1175 | } else { | |
1176 | p = br_port_get_rtnl(dev); | |
1177 | if (!p) { | |
1178 | pr_info("bridge: RTM_DELNEIGH %s not a bridge port\n", | |
1179 | dev->name); | |
1180 | return -EINVAL; | |
1181 | } | |
1182 | vg = nbp_vlan_group(p); | |
5019ab50 | 1183 | br = p->br; |
36fd2b63 | 1184 | } |
1185 | ||
f6f6424b | 1186 | if (vid) { |
2594e906 NA |
1187 | v = br_vlan_find(vg, vid); |
1188 | if (!v) { | |
3741873b | 1189 | pr_info("bridge: RTM_DELNEIGH with unconfigured vlan %d on %s\n", vid, dev->name); |
1690be63 VY |
1190 | return -EINVAL; |
1191 | } | |
36fd2b63 | 1192 | |
5019ab50 | 1193 | err = __br_fdb_delete(br, p, addr, vid); |
1690be63 | 1194 | } else { |
25d3b493 | 1195 | err = -ENOENT; |
5019ab50 | 1196 | err &= __br_fdb_delete(br, p, addr, 0); |
2594e906 | 1197 | if (!vg || !vg->num_vlans) |
5019ab50 | 1198 | return err; |
1690be63 | 1199 | |
3741873b RP |
1200 | list_for_each_entry(v, &vg->vlan_list, vlist) { |
1201 | if (!br_vlan_should_use(v)) | |
1202 | continue; | |
5019ab50 | 1203 | err &= __br_fdb_delete(br, p, addr, v->vid); |
3741873b | 1204 | } |
1690be63 | 1205 | } |
5019ab50 | 1206 | |
36fd2b63 | 1207 | return err; |
1208 | } | |
8db24af7 VY |
1209 | |
1210 | int br_fdb_sync_static(struct net_bridge *br, struct net_bridge_port *p) | |
1211 | { | |
eb793583 | 1212 | struct net_bridge_fdb_entry *f, *tmp; |
367dc658 | 1213 | int err = 0; |
8db24af7 VY |
1214 | |
1215 | ASSERT_RTNL(); | |
1216 | ||
eb793583 NA |
1217 | /* the key here is that static entries change only under rtnl */ |
1218 | rcu_read_lock(); | |
1219 | hlist_for_each_entry_rcu(f, &br->fdb_list, fdb_node) { | |
1220 | /* We only care for static entries */ | |
29e63fff | 1221 | if (!test_bit(BR_FDB_STATIC, &f->flags)) |
eb793583 NA |
1222 | continue; |
1223 | err = dev_uc_add(p->dev, f->key.addr.addr); | |
1224 | if (err) | |
1225 | goto rollback; | |
8db24af7 | 1226 | } |
eb793583 NA |
1227 | done: |
1228 | rcu_read_unlock(); | |
8db24af7 | 1229 | |
eb793583 | 1230 | return err; |
8db24af7 | 1231 | |
eb793583 NA |
1232 | rollback: |
1233 | hlist_for_each_entry_rcu(tmp, &br->fdb_list, fdb_node) { | |
1234 | /* We only care for static entries */ | |
29e63fff | 1235 | if (!test_bit(BR_FDB_STATIC, &tmp->flags)) |
eb793583 NA |
1236 | continue; |
1237 | if (tmp == f) | |
1238 | break; | |
1239 | dev_uc_del(p->dev, tmp->key.addr.addr); | |
8db24af7 | 1240 | } |
eb793583 NA |
1241 | |
1242 | goto done; | |
8db24af7 VY |
1243 | } |
1244 | ||
1245 | void br_fdb_unsync_static(struct net_bridge *br, struct net_bridge_port *p) | |
1246 | { | |
eb793583 | 1247 | struct net_bridge_fdb_entry *f; |
8db24af7 VY |
1248 | |
1249 | ASSERT_RTNL(); | |
1250 | ||
eb793583 NA |
1251 | rcu_read_lock(); |
1252 | hlist_for_each_entry_rcu(f, &br->fdb_list, fdb_node) { | |
1253 | /* We only care for static entries */ | |
29e63fff | 1254 | if (!test_bit(BR_FDB_STATIC, &f->flags)) |
eb793583 | 1255 | continue; |
8db24af7 | 1256 | |
eb793583 | 1257 | dev_uc_del(p->dev, f->key.addr.addr); |
8db24af7 | 1258 | } |
eb793583 | 1259 | rcu_read_unlock(); |
8db24af7 | 1260 | } |
cf6b8e1e | 1261 | |
3aeb6617 | 1262 | int br_fdb_external_learn_add(struct net_bridge *br, struct net_bridge_port *p, |
45a68787 | 1263 | const unsigned char *addr, u16 vid, |
161d82de | 1264 | bool swdev_notify) |
cf6b8e1e | 1265 | { |
cf6b8e1e | 1266 | struct net_bridge_fdb_entry *fdb; |
7597b266 | 1267 | bool modified = false; |
cf6b8e1e SF |
1268 | int err = 0; |
1269 | ||
b74fd306 RP |
1270 | trace_br_fdb_external_learn_add(br, p, addr, vid); |
1271 | ||
cf6b8e1e SF |
1272 | spin_lock_bh(&br->hash_lock); |
1273 | ||
bfd0aeac | 1274 | fdb = br_fdb_find(br, addr, vid); |
cf6b8e1e | 1275 | if (!fdb) { |
31f1155b NA |
1276 | unsigned long flags = BIT(BR_FDB_ADDED_BY_EXT_LEARN); |
1277 | ||
1278 | if (swdev_notify) | |
1279 | flags |= BIT(BR_FDB_ADDED_BY_USER); | |
0541a629 | 1280 | |
45a68787 | 1281 | if (!p) |
0541a629 VO |
1282 | flags |= BIT(BR_FDB_LOCAL); |
1283 | ||
31f1155b | 1284 | fdb = fdb_create(br, p, addr, vid, flags); |
cf6b8e1e SF |
1285 | if (!fdb) { |
1286 | err = -ENOMEM; | |
1287 | goto err_unlock; | |
1288 | } | |
161d82de | 1289 | fdb_notify(br, fdb, RTM_NEWNEIGH, swdev_notify); |
7597b266 | 1290 | } else { |
cf6b8e1e | 1291 | fdb->updated = jiffies; |
7597b266 | 1292 | |
3e19ae7c VO |
1293 | if (READ_ONCE(fdb->dst) != p) { |
1294 | WRITE_ONCE(fdb->dst, p); | |
7597b266 NA |
1295 | modified = true; |
1296 | } | |
1297 | ||
b5cd9f7c | 1298 | if (test_bit(BR_FDB_ADDED_BY_EXT_LEARN, &fdb->flags)) { |
7597b266 NA |
1299 | /* Refresh entry */ |
1300 | fdb->used = jiffies; | |
ac3ca6af | 1301 | } else if (!test_bit(BR_FDB_ADDED_BY_USER, &fdb->flags)) { |
7597b266 | 1302 | /* Take over SW learned entry */ |
b5cd9f7c | 1303 | set_bit(BR_FDB_ADDED_BY_EXT_LEARN, &fdb->flags); |
7597b266 NA |
1304 | modified = true; |
1305 | } | |
1306 | ||
710ae728 | 1307 | if (swdev_notify) |
ac3ca6af | 1308 | set_bit(BR_FDB_ADDED_BY_USER, &fdb->flags); |
710ae728 | 1309 | |
45a68787 | 1310 | if (!p) |
0541a629 VO |
1311 | set_bit(BR_FDB_LOCAL, &fdb->flags); |
1312 | ||
7597b266 | 1313 | if (modified) |
161d82de | 1314 | fdb_notify(br, fdb, RTM_NEWNEIGH, swdev_notify); |
cf6b8e1e SF |
1315 | } |
1316 | ||
1317 | err_unlock: | |
1318 | spin_unlock_bh(&br->hash_lock); | |
cf6b8e1e SF |
1319 | |
1320 | return err; | |
1321 | } | |
cf6b8e1e | 1322 | |
3aeb6617 | 1323 | int br_fdb_external_learn_del(struct net_bridge *br, struct net_bridge_port *p, |
161d82de PM |
1324 | const unsigned char *addr, u16 vid, |
1325 | bool swdev_notify) | |
cf6b8e1e | 1326 | { |
cf6b8e1e SF |
1327 | struct net_bridge_fdb_entry *fdb; |
1328 | int err = 0; | |
1329 | ||
cf6b8e1e SF |
1330 | spin_lock_bh(&br->hash_lock); |
1331 | ||
bfd0aeac | 1332 | fdb = br_fdb_find(br, addr, vid); |
b5cd9f7c | 1333 | if (fdb && test_bit(BR_FDB_ADDED_BY_EXT_LEARN, &fdb->flags)) |
161d82de | 1334 | fdb_delete(br, fdb, swdev_notify); |
cf6b8e1e SF |
1335 | else |
1336 | err = -ENOENT; | |
1337 | ||
1338 | spin_unlock_bh(&br->hash_lock); | |
cf6b8e1e SF |
1339 | |
1340 | return err; | |
1341 | } | |
9fe8bcec AS |
1342 | |
1343 | void br_fdb_offloaded_set(struct net_bridge *br, struct net_bridge_port *p, | |
e9ba0fbc | 1344 | const unsigned char *addr, u16 vid, bool offloaded) |
9fe8bcec AS |
1345 | { |
1346 | struct net_bridge_fdb_entry *fdb; | |
1347 | ||
1348 | spin_lock_bh(&br->hash_lock); | |
1349 | ||
1350 | fdb = br_fdb_find(br, addr, vid); | |
d38c6e3d NA |
1351 | if (fdb && offloaded != test_bit(BR_FDB_OFFLOADED, &fdb->flags)) |
1352 | change_bit(BR_FDB_OFFLOADED, &fdb->flags); | |
9fe8bcec AS |
1353 | |
1354 | spin_unlock_bh(&br->hash_lock); | |
1355 | } | |
43920edf PM |
1356 | |
1357 | void br_fdb_clear_offload(const struct net_device *dev, u16 vid) | |
1358 | { | |
1359 | struct net_bridge_fdb_entry *f; | |
1360 | struct net_bridge_port *p; | |
1361 | ||
1362 | ASSERT_RTNL(); | |
1363 | ||
1364 | p = br_port_get_rtnl(dev); | |
1365 | if (!p) | |
1366 | return; | |
1367 | ||
1368 | spin_lock_bh(&p->br->hash_lock); | |
1369 | hlist_for_each_entry(f, &p->br->fdb_list, fdb_node) { | |
1370 | if (f->dst == p && f->key.vlan_id == vid) | |
d38c6e3d | 1371 | clear_bit(BR_FDB_OFFLOADED, &f->flags); |
43920edf PM |
1372 | } |
1373 | spin_unlock_bh(&p->br->hash_lock); | |
1374 | } | |
1375 | EXPORT_SYMBOL_GPL(br_fdb_clear_offload); |