1 | // SPDX-License-Identifier: GPL-2.0-or-later |
---|---|
2 | /* |
3 | * Forwarding database |
4 | * Linux ethernet bridge |
5 | * |
6 | * Authors: |
7 | * Lennert Buytenhek <buytenh@gnu.org> |
8 | */ |
9 | |
10 | #include <linux/kernel.h> |
11 | #include <linux/init.h> |
12 | #include <linux/rculist.h> |
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> |
18 | #include <linux/random.h> |
19 | #include <linux/slab.h> |
20 | #include <linux/atomic.h> |
21 | #include <linux/unaligned.h> |
22 | #include <linux/if_vlan.h> |
23 | #include <net/switchdev.h> |
24 | #include <trace/events/bridge.h> |
25 | #include "br_private.h" |
26 | |
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, |
32 | }; |
33 | |
34 | static struct kmem_cache *br_fdb_cache __read_mostly; |
35 | |
36 | int __init br_fdb_init(void) |
37 | { |
38 | br_fdb_cache = KMEM_CACHE(net_bridge_fdb_entry, SLAB_HWCACHE_ALIGN); |
39 | if (!br_fdb_cache) |
40 | return -ENOMEM; |
41 | |
42 | return 0; |
43 | } |
44 | |
45 | void br_fdb_fini(void) |
46 | { |
47 | kmem_cache_destroy(s: br_fdb_cache); |
48 | } |
49 | |
50 | int br_fdb_hash_init(struct net_bridge *br) |
51 | { |
52 | return rhashtable_init(&br->fdb_hash_tbl, &br_fdb_rht_params); |
53 | } |
54 | |
55 | void br_fdb_hash_fini(struct net_bridge *br) |
56 | { |
57 | rhashtable_destroy(ht: &br->fdb_hash_tbl); |
58 | } |
59 | |
60 | /* if topology_changing then use forward_delay (default 15 sec) |
61 | * otherwise keep longer (default 5 minutes) |
62 | */ |
63 | static inline unsigned long hold_time(const struct net_bridge *br) |
64 | { |
65 | return br->topology_change ? br->forward_delay : br->ageing_time; |
66 | } |
67 | |
68 | static inline int has_expired(const struct net_bridge *br, |
69 | const struct net_bridge_fdb_entry *fdb) |
70 | { |
71 | return !test_bit(BR_FDB_STATIC, &fdb->flags) && |
72 | !test_bit(BR_FDB_ADDED_BY_EXT_LEARN, &fdb->flags) && |
73 | time_before_eq(fdb->updated + hold_time(br), jiffies); |
74 | } |
75 | |
76 | static int fdb_to_nud(const struct net_bridge *br, |
77 | const struct net_bridge_fdb_entry *fdb) |
78 | { |
79 | if (test_bit(BR_FDB_LOCAL, &fdb->flags)) |
80 | return NUD_PERMANENT; |
81 | else if (test_bit(BR_FDB_STATIC, &fdb->flags)) |
82 | return NUD_NOARP; |
83 | else if (has_expired(br, fdb)) |
84 | return NUD_STALE; |
85 | else |
86 | return NUD_REACHABLE; |
87 | } |
88 | |
89 | static int fdb_fill_info(struct sk_buff *skb, const struct net_bridge *br, |
90 | const struct net_bridge_fdb_entry *fdb, |
91 | u32 portid, u32 seq, int type, unsigned int flags) |
92 | { |
93 | const struct net_bridge_port *dst = READ_ONCE(fdb->dst); |
94 | unsigned long now = jiffies; |
95 | struct nda_cacheinfo ci; |
96 | struct nlmsghdr *nlh; |
97 | struct ndmsg *ndm; |
98 | u32 ext_flags = 0; |
99 | |
100 | nlh = nlmsg_put(skb, portid, seq, type, payload: sizeof(*ndm), flags); |
101 | if (nlh == NULL) |
102 | return -EMSGSIZE; |
103 | |
104 | ndm = nlmsg_data(nlh); |
105 | ndm->ndm_family = AF_BRIDGE; |
106 | ndm->ndm_pad1 = 0; |
107 | ndm->ndm_pad2 = 0; |
108 | ndm->ndm_flags = 0; |
109 | ndm->ndm_type = 0; |
110 | ndm->ndm_ifindex = dst ? dst->dev->ifindex : br->dev->ifindex; |
111 | ndm->ndm_state = fdb_to_nud(br, fdb); |
112 | |
113 | if (test_bit(BR_FDB_OFFLOADED, &fdb->flags)) |
114 | ndm->ndm_flags |= NTF_OFFLOADED; |
115 | if (test_bit(BR_FDB_ADDED_BY_EXT_LEARN, &fdb->flags)) |
116 | ndm->ndm_flags |= NTF_EXT_LEARNED; |
117 | if (test_bit(BR_FDB_STICKY, &fdb->flags)) |
118 | ndm->ndm_flags |= NTF_STICKY; |
119 | if (test_bit(BR_FDB_LOCKED, &fdb->flags)) |
120 | ext_flags |= NTF_EXT_LOCKED; |
121 | |
122 | if (nla_put(skb, attrtype: NDA_LLADDR, ETH_ALEN, data: &fdb->key.addr)) |
123 | goto nla_put_failure; |
124 | if (nla_put_u32(skb, attrtype: NDA_MASTER, value: br->dev->ifindex)) |
125 | goto nla_put_failure; |
126 | if (nla_put_u32(skb, attrtype: NDA_FLAGS_EXT, value: ext_flags)) |
127 | goto nla_put_failure; |
128 | |
129 | ci.ndm_used = jiffies_to_clock_t(x: now - fdb->used); |
130 | ci.ndm_confirmed = 0; |
131 | ci.ndm_updated = jiffies_to_clock_t(x: now - fdb->updated); |
132 | ci.ndm_refcnt = 0; |
133 | if (nla_put(skb, attrtype: NDA_CACHEINFO, attrlen: sizeof(ci), data: &ci)) |
134 | goto nla_put_failure; |
135 | |
136 | if (fdb->key.vlan_id && nla_put(skb, attrtype: NDA_VLAN, attrlen: sizeof(u16), |
137 | data: &fdb->key.vlan_id)) |
138 | goto nla_put_failure; |
139 | |
140 | if (test_bit(BR_FDB_NOTIFY, &fdb->flags)) { |
141 | struct nlattr *nest = nla_nest_start(skb, attrtype: NDA_FDB_EXT_ATTRS); |
142 | u8 notify_bits = FDB_NOTIFY_BIT; |
143 | |
144 | if (!nest) |
145 | goto nla_put_failure; |
146 | if (test_bit(BR_FDB_NOTIFY_INACTIVE, &fdb->flags)) |
147 | notify_bits |= FDB_NOTIFY_INACTIVE_BIT; |
148 | |
149 | if (nla_put_u8(skb, attrtype: NFEA_ACTIVITY_NOTIFY, value: notify_bits)) { |
150 | nla_nest_cancel(skb, start: nest); |
151 | goto nla_put_failure; |
152 | } |
153 | |
154 | nla_nest_end(skb, start: nest); |
155 | } |
156 | |
157 | nlmsg_end(skb, nlh); |
158 | return 0; |
159 | |
160 | nla_put_failure: |
161 | nlmsg_cancel(skb, nlh); |
162 | return -EMSGSIZE; |
163 | } |
164 | |
165 | static inline size_t fdb_nlmsg_size(void) |
166 | { |
167 | return NLMSG_ALIGN(sizeof(struct ndmsg)) |
168 | + nla_total_size(ETH_ALEN) /* NDA_LLADDR */ |
169 | + nla_total_size(payload: sizeof(u32)) /* NDA_MASTER */ |
170 | + nla_total_size(payload: sizeof(u32)) /* NDA_FLAGS_EXT */ |
171 | + nla_total_size(payload: sizeof(u16)) /* NDA_VLAN */ |
172 | + nla_total_size(payload: sizeof(struct nda_cacheinfo)) |
173 | + nla_total_size(payload: 0) /* NDA_FDB_EXT_ATTRS */ |
174 | + nla_total_size(payload: sizeof(u8)); /* NFEA_ACTIVITY_NOTIFY */ |
175 | } |
176 | |
177 | static void fdb_notify(struct net_bridge *br, |
178 | const struct net_bridge_fdb_entry *fdb, int type, |
179 | bool swdev_notify) |
180 | { |
181 | struct net *net = dev_net(dev: br->dev); |
182 | struct sk_buff *skb; |
183 | int err = -ENOBUFS; |
184 | |
185 | if (swdev_notify) |
186 | br_switchdev_fdb_notify(br, fdb, type); |
187 | |
188 | skb = nlmsg_new(payload: fdb_nlmsg_size(), GFP_ATOMIC); |
189 | if (skb == NULL) |
190 | goto errout; |
191 | |
192 | err = fdb_fill_info(skb, br, fdb, portid: 0, seq: 0, type, flags: 0); |
193 | if (err < 0) { |
194 | /* -EMSGSIZE implies BUG in fdb_nlmsg_size() */ |
195 | WARN_ON(err == -EMSGSIZE); |
196 | kfree_skb(skb); |
197 | goto errout; |
198 | } |
199 | rtnl_notify(skb, net, pid: 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC); |
200 | return; |
201 | errout: |
202 | rtnl_set_sk_err(net, RTNLGRP_NEIGH, error: err); |
203 | } |
204 | |
205 | static struct net_bridge_fdb_entry *fdb_find_rcu(struct rhashtable *tbl, |
206 | const unsigned char *addr, |
207 | __u16 vid) |
208 | { |
209 | struct net_bridge_fdb_key key; |
210 | |
211 | WARN_ON_ONCE(!rcu_read_lock_held()); |
212 | |
213 | key.vlan_id = vid; |
214 | memcpy(key.addr.addr, addr, sizeof(key.addr.addr)); |
215 | |
216 | return rhashtable_lookup(ht: tbl, key: &key, params: br_fdb_rht_params); |
217 | } |
218 | |
219 | /* requires bridge hash_lock */ |
220 | static struct net_bridge_fdb_entry *br_fdb_find(struct net_bridge *br, |
221 | const unsigned char *addr, |
222 | __u16 vid) |
223 | { |
224 | struct net_bridge_fdb_entry *fdb; |
225 | |
226 | lockdep_assert_held_once(&br->hash_lock); |
227 | |
228 | rcu_read_lock(); |
229 | fdb = fdb_find_rcu(tbl: &br->fdb_hash_tbl, addr, vid); |
230 | rcu_read_unlock(); |
231 | |
232 | return fdb; |
233 | } |
234 | |
235 | struct net_device *br_fdb_find_port(const struct net_device *br_dev, |
236 | const unsigned char *addr, |
237 | __u16 vid) |
238 | { |
239 | struct net_bridge_fdb_entry *f; |
240 | struct net_device *dev = NULL; |
241 | struct net_bridge *br; |
242 | |
243 | ASSERT_RTNL(); |
244 | |
245 | if (!netif_is_bridge_master(dev: br_dev)) |
246 | return NULL; |
247 | |
248 | br = netdev_priv(dev: br_dev); |
249 | rcu_read_lock(); |
250 | f = br_fdb_find_rcu(br, addr, vid); |
251 | if (f && f->dst) |
252 | dev = f->dst->dev; |
253 | rcu_read_unlock(); |
254 | |
255 | return dev; |
256 | } |
257 | EXPORT_SYMBOL_GPL(br_fdb_find_port); |
258 | |
259 | struct net_bridge_fdb_entry *br_fdb_find_rcu(struct net_bridge *br, |
260 | const unsigned char *addr, |
261 | __u16 vid) |
262 | { |
263 | return fdb_find_rcu(tbl: &br->fdb_hash_tbl, addr, vid); |
264 | } |
265 | |
266 | /* When a static FDB entry is added, the mac address from the entry is |
267 | * added to the bridge private HW address list and all required ports |
268 | * are then updated with the new information. |
269 | * Called under RTNL. |
270 | */ |
271 | static void fdb_add_hw_addr(struct net_bridge *br, const unsigned char *addr) |
272 | { |
273 | int err; |
274 | struct net_bridge_port *p; |
275 | |
276 | ASSERT_RTNL(); |
277 | |
278 | list_for_each_entry(p, &br->port_list, list) { |
279 | if (!br_promisc_port(p)) { |
280 | err = dev_uc_add(dev: p->dev, addr); |
281 | if (err) |
282 | goto undo; |
283 | } |
284 | } |
285 | |
286 | return; |
287 | undo: |
288 | list_for_each_entry_continue_reverse(p, &br->port_list, list) { |
289 | if (!br_promisc_port(p)) |
290 | dev_uc_del(dev: p->dev, addr); |
291 | } |
292 | } |
293 | |
294 | /* When a static FDB entry is deleted, the HW address from that entry is |
295 | * also removed from the bridge private HW address list and updates all |
296 | * the ports with needed information. |
297 | * Called under RTNL. |
298 | */ |
299 | static void fdb_del_hw_addr(struct net_bridge *br, const unsigned char *addr) |
300 | { |
301 | struct net_bridge_port *p; |
302 | |
303 | ASSERT_RTNL(); |
304 | |
305 | list_for_each_entry(p, &br->port_list, list) { |
306 | if (!br_promisc_port(p)) |
307 | dev_uc_del(dev: p->dev, addr); |
308 | } |
309 | } |
310 | |
311 | static void fdb_delete(struct net_bridge *br, struct net_bridge_fdb_entry *f, |
312 | bool swdev_notify) |
313 | { |
314 | trace_fdb_delete(br, f); |
315 | |
316 | if (test_bit(BR_FDB_STATIC, &f->flags)) |
317 | fdb_del_hw_addr(br, addr: f->key.addr.addr); |
318 | |
319 | hlist_del_init_rcu(n: &f->fdb_node); |
320 | rhashtable_remove_fast(ht: &br->fdb_hash_tbl, obj: &f->rhnode, |
321 | params: br_fdb_rht_params); |
322 | if (test_and_clear_bit(nr: BR_FDB_DYNAMIC_LEARNED, addr: &f->flags)) |
323 | atomic_dec(v: &br->fdb_n_learned); |
324 | fdb_notify(br, fdb: f, RTM_DELNEIGH, swdev_notify); |
325 | kfree_rcu(f, rcu); |
326 | } |
327 | |
328 | /* Delete a local entry if no other port had the same address. |
329 | * |
330 | * This function should only be called on entries with BR_FDB_LOCAL set, |
331 | * so even with BR_FDB_ADDED_BY_USER cleared we never need to increase |
332 | * the accounting for dynamically learned entries again. |
333 | */ |
334 | static void fdb_delete_local(struct net_bridge *br, |
335 | const struct net_bridge_port *p, |
336 | struct net_bridge_fdb_entry *f) |
337 | { |
338 | const unsigned char *addr = f->key.addr.addr; |
339 | struct net_bridge_vlan_group *vg; |
340 | const struct net_bridge_vlan *v; |
341 | struct net_bridge_port *op; |
342 | u16 vid = f->key.vlan_id; |
343 | |
344 | /* Maybe another port has same hw addr? */ |
345 | list_for_each_entry(op, &br->port_list, list) { |
346 | vg = nbp_vlan_group(p: op); |
347 | if (op != p && ether_addr_equal(addr1: op->dev->dev_addr, addr2: addr) && |
348 | (!vid || br_vlan_find(vg, vid))) { |
349 | f->dst = op; |
350 | clear_bit(nr: BR_FDB_ADDED_BY_USER, addr: &f->flags); |
351 | return; |
352 | } |
353 | } |
354 | |
355 | vg = br_vlan_group(br); |
356 | v = br_vlan_find(vg, vid); |
357 | /* Maybe bridge device has same hw addr? */ |
358 | if (p && ether_addr_equal(addr1: br->dev->dev_addr, addr2: addr) && |
359 | (!vid || (v && br_vlan_should_use(v)))) { |
360 | f->dst = NULL; |
361 | clear_bit(nr: BR_FDB_ADDED_BY_USER, addr: &f->flags); |
362 | return; |
363 | } |
364 | |
365 | fdb_delete(br, f, swdev_notify: true); |
366 | } |
367 | |
368 | void br_fdb_find_delete_local(struct net_bridge *br, |
369 | const struct net_bridge_port *p, |
370 | const unsigned char *addr, u16 vid) |
371 | { |
372 | struct net_bridge_fdb_entry *f; |
373 | |
374 | spin_lock_bh(lock: &br->hash_lock); |
375 | f = br_fdb_find(br, addr, vid); |
376 | if (f && test_bit(BR_FDB_LOCAL, &f->flags) && |
377 | !test_bit(BR_FDB_ADDED_BY_USER, &f->flags) && f->dst == p) |
378 | fdb_delete_local(br, p, f); |
379 | spin_unlock_bh(lock: &br->hash_lock); |
380 | } |
381 | |
382 | static struct net_bridge_fdb_entry *fdb_create(struct net_bridge *br, |
383 | struct net_bridge_port *source, |
384 | const unsigned char *addr, |
385 | __u16 vid, |
386 | unsigned long flags) |
387 | { |
388 | bool learned = !test_bit(BR_FDB_ADDED_BY_USER, &flags) && |
389 | !test_bit(BR_FDB_LOCAL, &flags); |
390 | u32 max_learned = READ_ONCE(br->fdb_max_learned); |
391 | struct net_bridge_fdb_entry *fdb; |
392 | int err; |
393 | |
394 | if (likely(learned)) { |
395 | int n_learned = atomic_read(v: &br->fdb_n_learned); |
396 | |
397 | if (unlikely(max_learned && n_learned >= max_learned)) |
398 | return NULL; |
399 | __set_bit(BR_FDB_DYNAMIC_LEARNED, &flags); |
400 | } |
401 | |
402 | fdb = kmem_cache_alloc(br_fdb_cache, GFP_ATOMIC); |
403 | if (!fdb) |
404 | return NULL; |
405 | |
406 | memcpy(fdb->key.addr.addr, addr, ETH_ALEN); |
407 | WRITE_ONCE(fdb->dst, source); |
408 | fdb->key.vlan_id = vid; |
409 | fdb->flags = flags; |
410 | fdb->updated = fdb->used = jiffies; |
411 | err = rhashtable_lookup_insert_fast(ht: &br->fdb_hash_tbl, obj: &fdb->rhnode, |
412 | params: br_fdb_rht_params); |
413 | if (err) { |
414 | kmem_cache_free(s: br_fdb_cache, objp: fdb); |
415 | return NULL; |
416 | } |
417 | |
418 | if (likely(learned)) |
419 | atomic_inc(v: &br->fdb_n_learned); |
420 | |
421 | hlist_add_head_rcu(n: &fdb->fdb_node, h: &br->fdb_list); |
422 | |
423 | return fdb; |
424 | } |
425 | |
426 | static int fdb_add_local(struct net_bridge *br, struct net_bridge_port *source, |
427 | const unsigned char *addr, u16 vid) |
428 | { |
429 | struct net_bridge_fdb_entry *fdb; |
430 | |
431 | if (!is_valid_ether_addr(addr)) |
432 | return -EINVAL; |
433 | |
434 | fdb = br_fdb_find(br, addr, vid); |
435 | if (fdb) { |
436 | /* it is okay to have multiple ports with same |
437 | * address, just use the first one. |
438 | */ |
439 | if (test_bit(BR_FDB_LOCAL, &fdb->flags)) |
440 | return 0; |
441 | br_warn(br, "adding interface %s with same address as a received packet (addr:%pM, vlan:%u)\n", |
442 | source ? source->dev->name : br->dev->name, addr, vid); |
443 | fdb_delete(br, f: fdb, swdev_notify: true); |
444 | } |
445 | |
446 | fdb = fdb_create(br, source, addr, vid, |
447 | BIT(BR_FDB_LOCAL) | BIT(BR_FDB_STATIC)); |
448 | if (!fdb) |
449 | return -ENOMEM; |
450 | |
451 | fdb_add_hw_addr(br, addr); |
452 | fdb_notify(br, fdb, RTM_NEWNEIGH, swdev_notify: true); |
453 | return 0; |
454 | } |
455 | |
456 | void br_fdb_changeaddr(struct net_bridge_port *p, const unsigned char *newaddr) |
457 | { |
458 | struct net_bridge_vlan_group *vg; |
459 | struct net_bridge_fdb_entry *f; |
460 | struct net_bridge *br = p->br; |
461 | struct net_bridge_vlan *v; |
462 | |
463 | spin_lock_bh(lock: &br->hash_lock); |
464 | vg = nbp_vlan_group(p); |
465 | hlist_for_each_entry(f, &br->fdb_list, fdb_node) { |
466 | if (f->dst == p && test_bit(BR_FDB_LOCAL, &f->flags) && |
467 | !test_bit(BR_FDB_ADDED_BY_USER, &f->flags)) { |
468 | /* delete old one */ |
469 | fdb_delete_local(br, p, f); |
470 | |
471 | /* if this port has no vlan information |
472 | * configured, we can safely be done at |
473 | * this point. |
474 | */ |
475 | if (!vg || !vg->num_vlans) |
476 | goto insert; |
477 | } |
478 | } |
479 | |
480 | insert: |
481 | /* insert new address, may fail if invalid address or dup. */ |
482 | fdb_add_local(br, source: p, addr: newaddr, vid: 0); |
483 | |
484 | if (!vg || !vg->num_vlans) |
485 | goto done; |
486 | |
487 | /* Now add entries for every VLAN configured on the port. |
488 | * This function runs under RTNL so the bitmap will not change |
489 | * from under us. |
490 | */ |
491 | list_for_each_entry(v, &vg->vlan_list, vlist) |
492 | fdb_add_local(br, source: p, addr: newaddr, vid: v->vid); |
493 | |
494 | done: |
495 | spin_unlock_bh(lock: &br->hash_lock); |
496 | } |
497 | |
498 | void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr) |
499 | { |
500 | struct net_bridge_vlan_group *vg; |
501 | struct net_bridge_fdb_entry *f; |
502 | struct net_bridge_vlan *v; |
503 | |
504 | spin_lock_bh(lock: &br->hash_lock); |
505 | |
506 | /* If old entry was unassociated with any port, then delete it. */ |
507 | f = br_fdb_find(br, addr: br->dev->dev_addr, vid: 0); |
508 | if (f && test_bit(BR_FDB_LOCAL, &f->flags) && |
509 | !f->dst && !test_bit(BR_FDB_ADDED_BY_USER, &f->flags)) |
510 | fdb_delete_local(br, NULL, f); |
511 | |
512 | fdb_add_local(br, NULL, addr: newaddr, vid: 0); |
513 | vg = br_vlan_group(br); |
514 | if (!vg || !vg->num_vlans) |
515 | goto out; |
516 | /* Now remove and add entries for every VLAN configured on the |
517 | * bridge. This function runs under RTNL so the bitmap will not |
518 | * change from under us. |
519 | */ |
520 | list_for_each_entry(v, &vg->vlan_list, vlist) { |
521 | if (!br_vlan_should_use(v)) |
522 | continue; |
523 | f = br_fdb_find(br, addr: br->dev->dev_addr, vid: v->vid); |
524 | if (f && test_bit(BR_FDB_LOCAL, &f->flags) && |
525 | !f->dst && !test_bit(BR_FDB_ADDED_BY_USER, &f->flags)) |
526 | fdb_delete_local(br, NULL, f); |
527 | fdb_add_local(br, NULL, addr: newaddr, vid: v->vid); |
528 | } |
529 | out: |
530 | spin_unlock_bh(lock: &br->hash_lock); |
531 | } |
532 | |
533 | void br_fdb_cleanup(struct work_struct *work) |
534 | { |
535 | struct net_bridge *br = container_of(work, struct net_bridge, |
536 | gc_work.work); |
537 | struct net_bridge_fdb_entry *f = NULL; |
538 | unsigned long delay = hold_time(br); |
539 | unsigned long work_delay = delay; |
540 | unsigned long now = jiffies; |
541 | |
542 | /* this part is tricky, in order to avoid blocking learning and |
543 | * consequently forwarding, we rely on rcu to delete objects with |
544 | * delayed freeing allowing us to continue traversing |
545 | */ |
546 | rcu_read_lock(); |
547 | hlist_for_each_entry_rcu(f, &br->fdb_list, fdb_node) { |
548 | unsigned long this_timer = f->updated + delay; |
549 | |
550 | if (test_bit(BR_FDB_STATIC, &f->flags) || |
551 | test_bit(BR_FDB_ADDED_BY_EXT_LEARN, &f->flags)) { |
552 | if (test_bit(BR_FDB_NOTIFY, &f->flags)) { |
553 | if (time_after(this_timer, now)) |
554 | work_delay = min(work_delay, |
555 | this_timer - now); |
556 | else if (!test_and_set_bit(nr: BR_FDB_NOTIFY_INACTIVE, |
557 | addr: &f->flags)) |
558 | fdb_notify(br, fdb: f, RTM_NEWNEIGH, swdev_notify: false); |
559 | } |
560 | continue; |
561 | } |
562 | |
563 | if (time_after(this_timer, now)) { |
564 | work_delay = min(work_delay, this_timer - now); |
565 | } else { |
566 | spin_lock_bh(lock: &br->hash_lock); |
567 | if (!hlist_unhashed(h: &f->fdb_node)) |
568 | fdb_delete(br, f, swdev_notify: true); |
569 | spin_unlock_bh(lock: &br->hash_lock); |
570 | } |
571 | } |
572 | rcu_read_unlock(); |
573 | |
574 | /* Cleanup minimum 10 milliseconds apart */ |
575 | work_delay = max_t(unsigned long, work_delay, msecs_to_jiffies(10)); |
576 | mod_delayed_work(wq: system_long_wq, dwork: &br->gc_work, delay: work_delay); |
577 | } |
578 | |
579 | static bool __fdb_flush_matches(const struct net_bridge *br, |
580 | const struct net_bridge_fdb_entry *f, |
581 | const struct net_bridge_fdb_flush_desc *desc) |
582 | { |
583 | const struct net_bridge_port *dst = READ_ONCE(f->dst); |
584 | int port_ifidx = dst ? dst->dev->ifindex : br->dev->ifindex; |
585 | |
586 | if (desc->vlan_id && desc->vlan_id != f->key.vlan_id) |
587 | return false; |
588 | if (desc->port_ifindex && desc->port_ifindex != port_ifidx) |
589 | return false; |
590 | if (desc->flags_mask && (f->flags & desc->flags_mask) != desc->flags) |
591 | return false; |
592 | |
593 | return true; |
594 | } |
595 | |
596 | /* Flush forwarding database entries matching the description */ |
597 | void br_fdb_flush(struct net_bridge *br, |
598 | const struct net_bridge_fdb_flush_desc *desc) |
599 | { |
600 | struct net_bridge_fdb_entry *f; |
601 | |
602 | rcu_read_lock(); |
603 | hlist_for_each_entry_rcu(f, &br->fdb_list, fdb_node) { |
604 | if (!__fdb_flush_matches(br, f, desc)) |
605 | continue; |
606 | |
607 | spin_lock_bh(lock: &br->hash_lock); |
608 | if (!hlist_unhashed(h: &f->fdb_node)) |
609 | fdb_delete(br, f, swdev_notify: true); |
610 | spin_unlock_bh(lock: &br->hash_lock); |
611 | } |
612 | rcu_read_unlock(); |
613 | } |
614 | |
615 | static unsigned long __ndm_state_to_fdb_flags(u16 ndm_state) |
616 | { |
617 | unsigned long flags = 0; |
618 | |
619 | if (ndm_state & NUD_PERMANENT) |
620 | __set_bit(BR_FDB_LOCAL, &flags); |
621 | if (ndm_state & NUD_NOARP) |
622 | __set_bit(BR_FDB_STATIC, &flags); |
623 | |
624 | return flags; |
625 | } |
626 | |
627 | static unsigned long __ndm_flags_to_fdb_flags(u8 ndm_flags) |
628 | { |
629 | unsigned long flags = 0; |
630 | |
631 | if (ndm_flags & NTF_USE) |
632 | __set_bit(BR_FDB_ADDED_BY_USER, &flags); |
633 | if (ndm_flags & NTF_EXT_LEARNED) |
634 | __set_bit(BR_FDB_ADDED_BY_EXT_LEARN, &flags); |
635 | if (ndm_flags & NTF_OFFLOADED) |
636 | __set_bit(BR_FDB_OFFLOADED, &flags); |
637 | if (ndm_flags & NTF_STICKY) |
638 | __set_bit(BR_FDB_STICKY, &flags); |
639 | |
640 | return flags; |
641 | } |
642 | |
643 | static int __fdb_flush_validate_ifindex(const struct net_bridge *br, |
644 | int ifindex, |
645 | struct netlink_ext_ack *extack) |
646 | { |
647 | const struct net_device *dev; |
648 | |
649 | dev = __dev_get_by_index(net: dev_net(dev: br->dev), ifindex); |
650 | if (!dev) { |
651 | NL_SET_ERR_MSG_MOD(extack, "Unknown flush device ifindex"); |
652 | return -ENODEV; |
653 | } |
654 | if (!netif_is_bridge_master(dev) && !netif_is_bridge_port(dev)) { |
655 | NL_SET_ERR_MSG_MOD(extack, "Flush device is not a bridge or bridge port"); |
656 | return -EINVAL; |
657 | } |
658 | if (netif_is_bridge_master(dev) && dev != br->dev) { |
659 | NL_SET_ERR_MSG_MOD(extack, |
660 | "Flush bridge device does not match target bridge device"); |
661 | return -EINVAL; |
662 | } |
663 | if (netif_is_bridge_port(dev)) { |
664 | struct net_bridge_port *p = br_port_get_rtnl(dev); |
665 | |
666 | if (p->br != br) { |
667 | NL_SET_ERR_MSG_MOD(extack, "Port belongs to a different bridge device"); |
668 | return -EINVAL; |
669 | } |
670 | } |
671 | |
672 | return 0; |
673 | } |
674 | |
675 | static const struct nla_policy br_fdb_del_bulk_policy[NDA_MAX + 1] = { |
676 | [NDA_VLAN] = NLA_POLICY_RANGE(NLA_U16, 1, VLAN_N_VID - 2), |
677 | [NDA_IFINDEX] = NLA_POLICY_MIN(NLA_S32, 1), |
678 | [NDA_NDM_STATE_MASK] = { .type = NLA_U16 }, |
679 | [NDA_NDM_FLAGS_MASK] = { .type = NLA_U8 }, |
680 | }; |
681 | |
682 | int br_fdb_delete_bulk(struct nlmsghdr *nlh, struct net_device *dev, |
683 | struct netlink_ext_ack *extack) |
684 | { |
685 | struct net_bridge_fdb_flush_desc desc = {}; |
686 | struct ndmsg *ndm = nlmsg_data(nlh); |
687 | struct net_bridge_port *p = NULL; |
688 | struct nlattr *tb[NDA_MAX + 1]; |
689 | struct net_bridge *br; |
690 | u8 ndm_flags; |
691 | int err; |
692 | |
693 | ndm_flags = ndm->ndm_flags & ~FDB_FLUSH_IGNORED_NDM_FLAGS; |
694 | |
695 | err = nlmsg_parse(nlh, hdrlen: sizeof(*ndm), tb, NDA_MAX, |
696 | policy: br_fdb_del_bulk_policy, extack); |
697 | if (err) |
698 | return err; |
699 | |
700 | if (netif_is_bridge_master(dev)) { |
701 | br = netdev_priv(dev); |
702 | } else { |
703 | p = br_port_get_rtnl(dev); |
704 | if (!p) { |
705 | NL_SET_ERR_MSG_MOD(extack, "Device is not a bridge port"); |
706 | return -EINVAL; |
707 | } |
708 | br = p->br; |
709 | } |
710 | |
711 | if (tb[NDA_VLAN]) |
712 | desc.vlan_id = nla_get_u16(nla: tb[NDA_VLAN]); |
713 | |
714 | if (ndm_flags & ~FDB_FLUSH_ALLOWED_NDM_FLAGS) { |
715 | NL_SET_ERR_MSG(extack, "Unsupported fdb flush ndm flag bits set"); |
716 | return -EINVAL; |
717 | } |
718 | if (ndm->ndm_state & ~FDB_FLUSH_ALLOWED_NDM_STATES) { |
719 | NL_SET_ERR_MSG(extack, "Unsupported fdb flush ndm state bits set"); |
720 | return -EINVAL; |
721 | } |
722 | |
723 | desc.flags |= __ndm_state_to_fdb_flags(ndm_state: ndm->ndm_state); |
724 | desc.flags |= __ndm_flags_to_fdb_flags(ndm_flags); |
725 | if (tb[NDA_NDM_STATE_MASK]) { |
726 | u16 ndm_state_mask = nla_get_u16(nla: tb[NDA_NDM_STATE_MASK]); |
727 | |
728 | desc.flags_mask |= __ndm_state_to_fdb_flags(ndm_state: ndm_state_mask); |
729 | } |
730 | if (tb[NDA_NDM_FLAGS_MASK]) { |
731 | u8 ndm_flags_mask = nla_get_u8(nla: tb[NDA_NDM_FLAGS_MASK]); |
732 | |
733 | desc.flags_mask |= __ndm_flags_to_fdb_flags(ndm_flags: ndm_flags_mask); |
734 | } |
735 | if (tb[NDA_IFINDEX]) { |
736 | int ifidx = nla_get_s32(nla: tb[NDA_IFINDEX]); |
737 | |
738 | err = __fdb_flush_validate_ifindex(br, ifindex: ifidx, extack); |
739 | if (err) |
740 | return err; |
741 | desc.port_ifindex = ifidx; |
742 | } else if (p) { |
743 | /* flush was invoked with port device and NTF_MASTER */ |
744 | desc.port_ifindex = p->dev->ifindex; |
745 | } |
746 | |
747 | br_debug(br, "flushing port ifindex: %d vlan id: %u flags: 0x%lx flags mask: 0x%lx\n", |
748 | desc.port_ifindex, desc.vlan_id, desc.flags, desc.flags_mask); |
749 | |
750 | br_fdb_flush(br, desc: &desc); |
751 | |
752 | return 0; |
753 | } |
754 | |
755 | /* Flush all entries referring to a specific port. |
756 | * if do_all is set also flush static entries |
757 | * if vid is set delete all entries that match the vlan_id |
758 | */ |
759 | void br_fdb_delete_by_port(struct net_bridge *br, |
760 | const struct net_bridge_port *p, |
761 | u16 vid, |
762 | int do_all) |
763 | { |
764 | struct net_bridge_fdb_entry *f; |
765 | struct hlist_node *tmp; |
766 | |
767 | spin_lock_bh(lock: &br->hash_lock); |
768 | hlist_for_each_entry_safe(f, tmp, &br->fdb_list, fdb_node) { |
769 | if (f->dst != p) |
770 | continue; |
771 | |
772 | if (!do_all) |
773 | if (test_bit(BR_FDB_STATIC, &f->flags) || |
774 | (test_bit(BR_FDB_ADDED_BY_EXT_LEARN, &f->flags) && |
775 | !test_bit(BR_FDB_OFFLOADED, &f->flags)) || |
776 | (vid && f->key.vlan_id != vid)) |
777 | continue; |
778 | |
779 | if (test_bit(BR_FDB_LOCAL, &f->flags)) |
780 | fdb_delete_local(br, p, f); |
781 | else |
782 | fdb_delete(br, f, swdev_notify: true); |
783 | } |
784 | spin_unlock_bh(lock: &br->hash_lock); |
785 | } |
786 | |
787 | #if IS_ENABLED(CONFIG_ATM_LANE) |
788 | /* Interface used by ATM LANE hook to test |
789 | * if an addr is on some other bridge port */ |
790 | int br_fdb_test_addr(struct net_device *dev, unsigned char *addr) |
791 | { |
792 | struct net_bridge_fdb_entry *fdb; |
793 | struct net_bridge_port *port; |
794 | int ret; |
795 | |
796 | rcu_read_lock(); |
797 | port = br_port_get_rcu(dev); |
798 | if (!port) |
799 | ret = 0; |
800 | else { |
801 | const struct net_bridge_port *dst = NULL; |
802 | |
803 | fdb = br_fdb_find_rcu(br: port->br, addr, vid: 0); |
804 | if (fdb) |
805 | dst = READ_ONCE(fdb->dst); |
806 | |
807 | ret = dst && dst->dev != dev && |
808 | dst->state == BR_STATE_FORWARDING; |
809 | } |
810 | rcu_read_unlock(); |
811 | |
812 | return ret; |
813 | } |
814 | #endif /* CONFIG_ATM_LANE */ |
815 | |
816 | /* |
817 | * Fill buffer with forwarding table records in |
818 | * the API format. |
819 | */ |
820 | int br_fdb_fillbuf(struct net_bridge *br, void *buf, |
821 | unsigned long maxnum, unsigned long skip) |
822 | { |
823 | struct net_bridge_fdb_entry *f; |
824 | struct __fdb_entry *fe = buf; |
825 | int num = 0; |
826 | |
827 | memset(buf, 0, maxnum*sizeof(struct __fdb_entry)); |
828 | |
829 | rcu_read_lock(); |
830 | hlist_for_each_entry_rcu(f, &br->fdb_list, fdb_node) { |
831 | if (num >= maxnum) |
832 | break; |
833 | |
834 | if (has_expired(br, fdb: f)) |
835 | continue; |
836 | |
837 | /* ignore pseudo entry for local MAC address */ |
838 | if (!f->dst) |
839 | continue; |
840 | |
841 | if (skip) { |
842 | --skip; |
843 | continue; |
844 | } |
845 | |
846 | /* convert from internal format to API */ |
847 | memcpy(fe->mac_addr, f->key.addr.addr, ETH_ALEN); |
848 | |
849 | /* due to ABI compat need to split into hi/lo */ |
850 | fe->port_no = f->dst->port_no; |
851 | fe->port_hi = f->dst->port_no >> 8; |
852 | |
853 | fe->is_local = test_bit(BR_FDB_LOCAL, &f->flags); |
854 | if (!test_bit(BR_FDB_STATIC, &f->flags)) |
855 | fe->ageing_timer_value = jiffies_delta_to_clock_t(delta: jiffies - f->updated); |
856 | ++fe; |
857 | ++num; |
858 | } |
859 | rcu_read_unlock(); |
860 | |
861 | return num; |
862 | } |
863 | |
864 | /* Add entry for local address of interface */ |
865 | int br_fdb_add_local(struct net_bridge *br, struct net_bridge_port *source, |
866 | const unsigned char *addr, u16 vid) |
867 | { |
868 | int ret; |
869 | |
870 | spin_lock_bh(lock: &br->hash_lock); |
871 | ret = fdb_add_local(br, source, addr, vid); |
872 | spin_unlock_bh(lock: &br->hash_lock); |
873 | return ret; |
874 | } |
875 | |
876 | /* returns true if the fdb was modified */ |
877 | static bool __fdb_mark_active(struct net_bridge_fdb_entry *fdb) |
878 | { |
879 | return !!(test_bit(BR_FDB_NOTIFY_INACTIVE, &fdb->flags) && |
880 | test_and_clear_bit(nr: BR_FDB_NOTIFY_INACTIVE, addr: &fdb->flags)); |
881 | } |
882 | |
883 | void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source, |
884 | const unsigned char *addr, u16 vid, unsigned long flags) |
885 | { |
886 | struct net_bridge_fdb_entry *fdb; |
887 | |
888 | /* some users want to always flood. */ |
889 | if (hold_time(br) == 0) |
890 | return; |
891 | |
892 | fdb = fdb_find_rcu(tbl: &br->fdb_hash_tbl, addr, vid); |
893 | if (likely(fdb)) { |
894 | /* attempt to update an entry for a local interface */ |
895 | if (unlikely(test_bit(BR_FDB_LOCAL, &fdb->flags))) { |
896 | if (net_ratelimit()) |
897 | br_warn(br, "received packet on %s with own address as source address (addr:%pM, vlan:%u)\n", |
898 | source->dev->name, addr, vid); |
899 | } else { |
900 | unsigned long now = jiffies; |
901 | bool fdb_modified = false; |
902 | |
903 | if (now != fdb->updated) { |
904 | fdb->updated = now; |
905 | fdb_modified = __fdb_mark_active(fdb); |
906 | } |
907 | |
908 | /* fastpath: update of existing entry */ |
909 | if (unlikely(source != READ_ONCE(fdb->dst) && |
910 | !test_bit(BR_FDB_STICKY, &fdb->flags))) { |
911 | br_switchdev_fdb_notify(br, fdb, RTM_DELNEIGH); |
912 | WRITE_ONCE(fdb->dst, source); |
913 | fdb_modified = true; |
914 | /* Take over HW learned entry */ |
915 | if (unlikely(test_bit(BR_FDB_ADDED_BY_EXT_LEARN, |
916 | &fdb->flags))) |
917 | clear_bit(nr: BR_FDB_ADDED_BY_EXT_LEARN, |
918 | addr: &fdb->flags); |
919 | /* Clear locked flag when roaming to an |
920 | * unlocked port. |
921 | */ |
922 | if (unlikely(test_bit(BR_FDB_LOCKED, &fdb->flags))) |
923 | clear_bit(nr: BR_FDB_LOCKED, addr: &fdb->flags); |
924 | } |
925 | |
926 | if (unlikely(test_bit(BR_FDB_ADDED_BY_USER, &flags))) { |
927 | set_bit(nr: BR_FDB_ADDED_BY_USER, addr: &fdb->flags); |
928 | if (test_and_clear_bit(nr: BR_FDB_DYNAMIC_LEARNED, |
929 | addr: &fdb->flags)) |
930 | atomic_dec(v: &br->fdb_n_learned); |
931 | } |
932 | if (unlikely(fdb_modified)) { |
933 | trace_br_fdb_update(br, source, addr, vid, flags); |
934 | fdb_notify(br, fdb, RTM_NEWNEIGH, swdev_notify: true); |
935 | } |
936 | } |
937 | } else { |
938 | spin_lock(lock: &br->hash_lock); |
939 | fdb = fdb_create(br, source, addr, vid, flags); |
940 | if (fdb) { |
941 | trace_br_fdb_update(br, source, addr, vid, flags); |
942 | fdb_notify(br, fdb, RTM_NEWNEIGH, swdev_notify: true); |
943 | } |
944 | /* else we lose race and someone else inserts |
945 | * it first, don't bother updating |
946 | */ |
947 | spin_unlock(lock: &br->hash_lock); |
948 | } |
949 | } |
950 | |
951 | /* Dump information about entries, in response to GETNEIGH */ |
952 | int br_fdb_dump(struct sk_buff *skb, |
953 | struct netlink_callback *cb, |
954 | struct net_device *dev, |
955 | struct net_device *filter_dev, |
956 | int *idx) |
957 | { |
958 | struct ndo_fdb_dump_context *ctx = (void *)cb->ctx; |
959 | struct net_bridge *br = netdev_priv(dev); |
960 | struct net_bridge_fdb_entry *f; |
961 | int err = 0; |
962 | |
963 | if (!netif_is_bridge_master(dev)) |
964 | return err; |
965 | |
966 | if (!filter_dev) { |
967 | err = ndo_dflt_fdb_dump(skb, cb, dev, NULL, idx); |
968 | if (err < 0) |
969 | return err; |
970 | } |
971 | |
972 | rcu_read_lock(); |
973 | hlist_for_each_entry_rcu(f, &br->fdb_list, fdb_node) { |
974 | if (*idx < ctx->fdb_idx) |
975 | goto skip; |
976 | if (filter_dev && (!f->dst || f->dst->dev != filter_dev)) { |
977 | if (filter_dev != dev) |
978 | goto skip; |
979 | /* !f->dst is a special case for bridge |
980 | * It means the MAC belongs to the bridge |
981 | * Therefore need a little more filtering |
982 | * we only want to dump the !f->dst case |
983 | */ |
984 | if (f->dst) |
985 | goto skip; |
986 | } |
987 | if (!filter_dev && f->dst) |
988 | goto skip; |
989 | |
990 | err = fdb_fill_info(skb, br, fdb: f, |
991 | NETLINK_CB(cb->skb).portid, |
992 | seq: cb->nlh->nlmsg_seq, |
993 | RTM_NEWNEIGH, |
994 | NLM_F_MULTI); |
995 | if (err < 0) |
996 | break; |
997 | skip: |
998 | *idx += 1; |
999 | } |
1000 | rcu_read_unlock(); |
1001 | |
1002 | return err; |
1003 | } |
1004 | |
1005 | int br_fdb_get(struct sk_buff *skb, |
1006 | struct nlattr *tb[], |
1007 | struct net_device *dev, |
1008 | const unsigned char *addr, |
1009 | u16 vid, u32 portid, u32 seq, |
1010 | struct netlink_ext_ack *extack) |
1011 | { |
1012 | struct net_bridge *br = netdev_priv(dev); |
1013 | struct net_bridge_fdb_entry *f; |
1014 | int err = 0; |
1015 | |
1016 | rcu_read_lock(); |
1017 | f = br_fdb_find_rcu(br, addr, vid); |
1018 | if (!f) { |
1019 | NL_SET_ERR_MSG(extack, "Fdb entry not found"); |
1020 | err = -ENOENT; |
1021 | goto errout; |
1022 | } |
1023 | |
1024 | err = fdb_fill_info(skb, br, fdb: f, portid, seq, |
1025 | RTM_NEWNEIGH, flags: 0); |
1026 | errout: |
1027 | rcu_read_unlock(); |
1028 | return err; |
1029 | } |
1030 | |
1031 | /* returns true if the fdb is modified */ |
1032 | static bool fdb_handle_notify(struct net_bridge_fdb_entry *fdb, u8 notify) |
1033 | { |
1034 | bool modified = false; |
1035 | |
1036 | /* allow to mark an entry as inactive, usually done on creation */ |
1037 | if ((notify & FDB_NOTIFY_INACTIVE_BIT) && |
1038 | !test_and_set_bit(nr: BR_FDB_NOTIFY_INACTIVE, addr: &fdb->flags)) |
1039 | modified = true; |
1040 | |
1041 | if ((notify & FDB_NOTIFY_BIT) && |
1042 | !test_and_set_bit(nr: BR_FDB_NOTIFY, addr: &fdb->flags)) { |
1043 | /* enabled activity tracking */ |
1044 | modified = true; |
1045 | } else if (!(notify & FDB_NOTIFY_BIT) && |
1046 | test_and_clear_bit(nr: BR_FDB_NOTIFY, addr: &fdb->flags)) { |
1047 | /* disabled activity tracking, clear notify state */ |
1048 | clear_bit(nr: BR_FDB_NOTIFY_INACTIVE, addr: &fdb->flags); |
1049 | modified = true; |
1050 | } |
1051 | |
1052 | return modified; |
1053 | } |
1054 | |
1055 | /* Update (create or replace) forwarding database entry */ |
1056 | static int fdb_add_entry(struct net_bridge *br, struct net_bridge_port *source, |
1057 | const u8 *addr, struct ndmsg *ndm, u16 flags, u16 vid, |
1058 | struct nlattr *nfea_tb[]) |
1059 | { |
1060 | bool is_sticky = !!(ndm->ndm_flags & NTF_STICKY); |
1061 | bool refresh = !nfea_tb[NFEA_DONT_REFRESH]; |
1062 | struct net_bridge_fdb_entry *fdb; |
1063 | u16 state = ndm->ndm_state; |
1064 | bool modified = false; |
1065 | u8 notify = 0; |
1066 | |
1067 | /* If the port cannot learn allow only local and static entries */ |
1068 | if (source && !(state & NUD_PERMANENT) && !(state & NUD_NOARP) && |
1069 | !(source->state == BR_STATE_LEARNING || |
1070 | source->state == BR_STATE_FORWARDING)) |
1071 | return -EPERM; |
1072 | |
1073 | if (!source && !(state & NUD_PERMANENT)) { |
1074 | pr_info("bridge: RTM_NEWNEIGH %s without NUD_PERMANENT\n", |
1075 | br->dev->name); |
1076 | return -EINVAL; |
1077 | } |
1078 | |
1079 | if (is_sticky && (state & NUD_PERMANENT)) |
1080 | return -EINVAL; |
1081 | |
1082 | if (nfea_tb[NFEA_ACTIVITY_NOTIFY]) { |
1083 | notify = nla_get_u8(nla: nfea_tb[NFEA_ACTIVITY_NOTIFY]); |
1084 | if ((notify & ~BR_FDB_NOTIFY_SETTABLE_BITS) || |
1085 | (notify & BR_FDB_NOTIFY_SETTABLE_BITS) == FDB_NOTIFY_INACTIVE_BIT) |
1086 | return -EINVAL; |
1087 | } |
1088 | |
1089 | fdb = br_fdb_find(br, addr, vid); |
1090 | if (fdb == NULL) { |
1091 | if (!(flags & NLM_F_CREATE)) |
1092 | return -ENOENT; |
1093 | |
1094 | fdb = fdb_create(br, source, addr, vid, |
1095 | BIT(BR_FDB_ADDED_BY_USER)); |
1096 | if (!fdb) |
1097 | return -ENOMEM; |
1098 | |
1099 | modified = true; |
1100 | } else { |
1101 | if (flags & NLM_F_EXCL) |
1102 | return -EEXIST; |
1103 | |
1104 | if (READ_ONCE(fdb->dst) != source) { |
1105 | WRITE_ONCE(fdb->dst, source); |
1106 | modified = true; |
1107 | } |
1108 | |
1109 | set_bit(nr: BR_FDB_ADDED_BY_USER, addr: &fdb->flags); |
1110 | if (test_and_clear_bit(nr: BR_FDB_DYNAMIC_LEARNED, addr: &fdb->flags)) |
1111 | atomic_dec(v: &br->fdb_n_learned); |
1112 | } |
1113 | |
1114 | if (fdb_to_nud(br, fdb) != state) { |
1115 | if (state & NUD_PERMANENT) { |
1116 | set_bit(nr: BR_FDB_LOCAL, addr: &fdb->flags); |
1117 | if (!test_and_set_bit(nr: BR_FDB_STATIC, addr: &fdb->flags)) |
1118 | fdb_add_hw_addr(br, addr); |
1119 | } else if (state & NUD_NOARP) { |
1120 | clear_bit(nr: BR_FDB_LOCAL, addr: &fdb->flags); |
1121 | if (!test_and_set_bit(nr: BR_FDB_STATIC, addr: &fdb->flags)) |
1122 | fdb_add_hw_addr(br, addr); |
1123 | } else { |
1124 | clear_bit(nr: BR_FDB_LOCAL, addr: &fdb->flags); |
1125 | if (test_and_clear_bit(nr: BR_FDB_STATIC, addr: &fdb->flags)) |
1126 | fdb_del_hw_addr(br, addr); |
1127 | } |
1128 | |
1129 | modified = true; |
1130 | } |
1131 | |
1132 | if (is_sticky != test_bit(BR_FDB_STICKY, &fdb->flags)) { |
1133 | change_bit(nr: BR_FDB_STICKY, addr: &fdb->flags); |
1134 | modified = true; |
1135 | } |
1136 | |
1137 | if (test_and_clear_bit(nr: BR_FDB_LOCKED, addr: &fdb->flags)) |
1138 | modified = true; |
1139 | |
1140 | if (fdb_handle_notify(fdb, notify)) |
1141 | modified = true; |
1142 | |
1143 | fdb->used = jiffies; |
1144 | if (modified) { |
1145 | if (refresh) |
1146 | fdb->updated = jiffies; |
1147 | fdb_notify(br, fdb, RTM_NEWNEIGH, swdev_notify: true); |
1148 | } |
1149 | |
1150 | return 0; |
1151 | } |
1152 | |
1153 | static int __br_fdb_add(struct ndmsg *ndm, struct net_bridge *br, |
1154 | struct net_bridge_port *p, const unsigned char *addr, |
1155 | u16 nlh_flags, u16 vid, struct nlattr *nfea_tb[], |
1156 | bool *notified, struct netlink_ext_ack *extack) |
1157 | { |
1158 | int err = 0; |
1159 | |
1160 | if (ndm->ndm_flags & NTF_USE) { |
1161 | if (!p) { |
1162 | pr_info("bridge: RTM_NEWNEIGH %s with NTF_USE is not supported\n", |
1163 | br->dev->name); |
1164 | return -EINVAL; |
1165 | } |
1166 | if (!nbp_state_should_learn(p)) |
1167 | return 0; |
1168 | |
1169 | local_bh_disable(); |
1170 | rcu_read_lock(); |
1171 | br_fdb_update(br, source: p, addr, vid, BIT(BR_FDB_ADDED_BY_USER)); |
1172 | rcu_read_unlock(); |
1173 | local_bh_enable(); |
1174 | } else if (ndm->ndm_flags & NTF_EXT_LEARNED) { |
1175 | if (!p && !(ndm->ndm_state & NUD_PERMANENT)) { |
1176 | NL_SET_ERR_MSG_MOD(extack, |
1177 | "FDB entry towards bridge must be permanent"); |
1178 | return -EINVAL; |
1179 | } |
1180 | err = br_fdb_external_learn_add(br, p, addr, vid, locked: false, swdev_notify: true); |
1181 | } else { |
1182 | spin_lock_bh(lock: &br->hash_lock); |
1183 | err = fdb_add_entry(br, source: p, addr, ndm, flags: nlh_flags, vid, nfea_tb); |
1184 | spin_unlock_bh(lock: &br->hash_lock); |
1185 | } |
1186 | |
1187 | if (!err) |
1188 | *notified = true; |
1189 | return err; |
1190 | } |
1191 | |
1192 | static const struct nla_policy br_nda_fdb_pol[NFEA_MAX + 1] = { |
1193 | [NFEA_ACTIVITY_NOTIFY] = { .type = NLA_U8 }, |
1194 | [NFEA_DONT_REFRESH] = { .type = NLA_FLAG }, |
1195 | }; |
1196 | |
1197 | /* Add new permanent fdb entry with RTM_NEWNEIGH */ |
1198 | int br_fdb_add(struct ndmsg *ndm, struct nlattr *tb[], |
1199 | struct net_device *dev, |
1200 | const unsigned char *addr, u16 vid, u16 nlh_flags, |
1201 | bool *notified, struct netlink_ext_ack *extack) |
1202 | { |
1203 | struct nlattr *nfea_tb[NFEA_MAX + 1], *attr; |
1204 | struct net_bridge_vlan_group *vg; |
1205 | struct net_bridge_port *p = NULL; |
1206 | struct net_bridge_vlan *v; |
1207 | struct net_bridge *br = NULL; |
1208 | u32 ext_flags = 0; |
1209 | int err = 0; |
1210 | |
1211 | trace_br_fdb_add(ndm, dev, addr, vid, nlh_flags); |
1212 | |
1213 | if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_NOARP|NUD_REACHABLE))) { |
1214 | pr_info("bridge: RTM_NEWNEIGH with invalid state %#x\n", ndm->ndm_state); |
1215 | return -EINVAL; |
1216 | } |
1217 | |
1218 | if (is_zero_ether_addr(addr)) { |
1219 | pr_info("bridge: RTM_NEWNEIGH with invalid ether address\n"); |
1220 | return -EINVAL; |
1221 | } |
1222 | |
1223 | if (netif_is_bridge_master(dev)) { |
1224 | br = netdev_priv(dev); |
1225 | vg = br_vlan_group(br); |
1226 | } else { |
1227 | p = br_port_get_rtnl(dev); |
1228 | if (!p) { |
1229 | pr_info("bridge: RTM_NEWNEIGH %s not a bridge port\n", |
1230 | dev->name); |
1231 | return -EINVAL; |
1232 | } |
1233 | br = p->br; |
1234 | vg = nbp_vlan_group(p); |
1235 | } |
1236 | |
1237 | if (tb[NDA_FLAGS_EXT]) |
1238 | ext_flags = nla_get_u32(nla: tb[NDA_FLAGS_EXT]); |
1239 | |
1240 | if (ext_flags & NTF_EXT_LOCKED) { |
1241 | NL_SET_ERR_MSG_MOD(extack, "Cannot add FDB entry with \"locked\" flag set"); |
1242 | return -EINVAL; |
1243 | } |
1244 | |
1245 | if (tb[NDA_FDB_EXT_ATTRS]) { |
1246 | attr = tb[NDA_FDB_EXT_ATTRS]; |
1247 | err = nla_parse_nested(tb: nfea_tb, NFEA_MAX, nla: attr, |
1248 | policy: br_nda_fdb_pol, extack); |
1249 | if (err) |
1250 | return err; |
1251 | } else { |
1252 | memset(nfea_tb, 0, sizeof(struct nlattr *) * (NFEA_MAX + 1)); |
1253 | } |
1254 | |
1255 | if (vid) { |
1256 | v = br_vlan_find(vg, vid); |
1257 | if (!v || !br_vlan_should_use(v)) { |
1258 | pr_info("bridge: RTM_NEWNEIGH with unconfigured vlan %d on %s\n", vid, dev->name); |
1259 | return -EINVAL; |
1260 | } |
1261 | |
1262 | /* VID was specified, so use it. */ |
1263 | err = __br_fdb_add(ndm, br, p, addr, nlh_flags, vid, nfea_tb, |
1264 | notified, extack); |
1265 | } else { |
1266 | err = __br_fdb_add(ndm, br, p, addr, nlh_flags, vid: 0, nfea_tb, |
1267 | notified, extack); |
1268 | if (err || !vg || !vg->num_vlans) |
1269 | goto out; |
1270 | |
1271 | /* We have vlans configured on this port and user didn't |
1272 | * specify a VLAN. To be nice, add/update entry for every |
1273 | * vlan on this port. |
1274 | */ |
1275 | list_for_each_entry(v, &vg->vlan_list, vlist) { |
1276 | if (!br_vlan_should_use(v)) |
1277 | continue; |
1278 | err = __br_fdb_add(ndm, br, p, addr, nlh_flags, vid: v->vid, |
1279 | nfea_tb, notified, extack); |
1280 | if (err) |
1281 | goto out; |
1282 | } |
1283 | } |
1284 | |
1285 | out: |
1286 | return err; |
1287 | } |
1288 | |
1289 | static int fdb_delete_by_addr_and_port(struct net_bridge *br, |
1290 | const struct net_bridge_port *p, |
1291 | const u8 *addr, u16 vlan, bool *notified) |
1292 | { |
1293 | struct net_bridge_fdb_entry *fdb; |
1294 | |
1295 | fdb = br_fdb_find(br, addr, vid: vlan); |
1296 | if (!fdb || READ_ONCE(fdb->dst) != p) |
1297 | return -ENOENT; |
1298 | |
1299 | fdb_delete(br, f: fdb, swdev_notify: true); |
1300 | *notified = true; |
1301 | |
1302 | return 0; |
1303 | } |
1304 | |
1305 | static int __br_fdb_delete(struct net_bridge *br, |
1306 | const struct net_bridge_port *p, |
1307 | const unsigned char *addr, u16 vid, bool *notified) |
1308 | { |
1309 | int err; |
1310 | |
1311 | spin_lock_bh(lock: &br->hash_lock); |
1312 | err = fdb_delete_by_addr_and_port(br, p, addr, vlan: vid, notified); |
1313 | spin_unlock_bh(lock: &br->hash_lock); |
1314 | |
1315 | return err; |
1316 | } |
1317 | |
1318 | /* Remove neighbor entry with RTM_DELNEIGH */ |
1319 | int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[], |
1320 | struct net_device *dev, |
1321 | const unsigned char *addr, u16 vid, bool *notified, |
1322 | struct netlink_ext_ack *extack) |
1323 | { |
1324 | struct net_bridge_vlan_group *vg; |
1325 | struct net_bridge_port *p = NULL; |
1326 | struct net_bridge *br; |
1327 | int err; |
1328 | |
1329 | if (netif_is_bridge_master(dev)) { |
1330 | br = netdev_priv(dev); |
1331 | vg = br_vlan_group(br); |
1332 | } else { |
1333 | p = br_port_get_rtnl(dev); |
1334 | if (!p) { |
1335 | pr_info("bridge: RTM_DELNEIGH %s not a bridge port\n", |
1336 | dev->name); |
1337 | return -EINVAL; |
1338 | } |
1339 | vg = nbp_vlan_group(p); |
1340 | br = p->br; |
1341 | } |
1342 | |
1343 | if (vid) { |
1344 | err = __br_fdb_delete(br, p, addr, vid, notified); |
1345 | } else { |
1346 | struct net_bridge_vlan *v; |
1347 | |
1348 | err = -ENOENT; |
1349 | err &= __br_fdb_delete(br, p, addr, vid: 0, notified); |
1350 | if (!vg || !vg->num_vlans) |
1351 | return err; |
1352 | |
1353 | list_for_each_entry(v, &vg->vlan_list, vlist) { |
1354 | if (!br_vlan_should_use(v)) |
1355 | continue; |
1356 | err &= __br_fdb_delete(br, p, addr, vid: v->vid, notified); |
1357 | } |
1358 | } |
1359 | |
1360 | return err; |
1361 | } |
1362 | |
1363 | int br_fdb_sync_static(struct net_bridge *br, struct net_bridge_port *p) |
1364 | { |
1365 | struct net_bridge_fdb_entry *f, *tmp; |
1366 | int err = 0; |
1367 | |
1368 | ASSERT_RTNL(); |
1369 | |
1370 | /* the key here is that static entries change only under rtnl */ |
1371 | rcu_read_lock(); |
1372 | hlist_for_each_entry_rcu(f, &br->fdb_list, fdb_node) { |
1373 | /* We only care for static entries */ |
1374 | if (!test_bit(BR_FDB_STATIC, &f->flags)) |
1375 | continue; |
1376 | err = dev_uc_add(dev: p->dev, addr: f->key.addr.addr); |
1377 | if (err) |
1378 | goto rollback; |
1379 | } |
1380 | done: |
1381 | rcu_read_unlock(); |
1382 | |
1383 | return err; |
1384 | |
1385 | rollback: |
1386 | hlist_for_each_entry_rcu(tmp, &br->fdb_list, fdb_node) { |
1387 | /* We only care for static entries */ |
1388 | if (!test_bit(BR_FDB_STATIC, &tmp->flags)) |
1389 | continue; |
1390 | if (tmp == f) |
1391 | break; |
1392 | dev_uc_del(dev: p->dev, addr: tmp->key.addr.addr); |
1393 | } |
1394 | |
1395 | goto done; |
1396 | } |
1397 | |
1398 | void br_fdb_unsync_static(struct net_bridge *br, struct net_bridge_port *p) |
1399 | { |
1400 | struct net_bridge_fdb_entry *f; |
1401 | |
1402 | ASSERT_RTNL(); |
1403 | |
1404 | rcu_read_lock(); |
1405 | hlist_for_each_entry_rcu(f, &br->fdb_list, fdb_node) { |
1406 | /* We only care for static entries */ |
1407 | if (!test_bit(BR_FDB_STATIC, &f->flags)) |
1408 | continue; |
1409 | |
1410 | dev_uc_del(dev: p->dev, addr: f->key.addr.addr); |
1411 | } |
1412 | rcu_read_unlock(); |
1413 | } |
1414 | |
1415 | int br_fdb_external_learn_add(struct net_bridge *br, struct net_bridge_port *p, |
1416 | const unsigned char *addr, u16 vid, bool locked, |
1417 | bool swdev_notify) |
1418 | { |
1419 | struct net_bridge_fdb_entry *fdb; |
1420 | bool modified = false; |
1421 | int err = 0; |
1422 | |
1423 | trace_br_fdb_external_learn_add(br, p, addr, vid); |
1424 | |
1425 | if (locked && (!p || !(p->flags & BR_PORT_MAB))) |
1426 | return -EINVAL; |
1427 | |
1428 | spin_lock_bh(lock: &br->hash_lock); |
1429 | |
1430 | fdb = br_fdb_find(br, addr, vid); |
1431 | if (!fdb) { |
1432 | unsigned long flags = BIT(BR_FDB_ADDED_BY_EXT_LEARN); |
1433 | |
1434 | if (swdev_notify) |
1435 | flags |= BIT(BR_FDB_ADDED_BY_USER); |
1436 | |
1437 | if (!p) |
1438 | flags |= BIT(BR_FDB_LOCAL); |
1439 | |
1440 | if (locked) |
1441 | flags |= BIT(BR_FDB_LOCKED); |
1442 | |
1443 | fdb = fdb_create(br, source: p, addr, vid, flags); |
1444 | if (!fdb) { |
1445 | err = -ENOMEM; |
1446 | goto err_unlock; |
1447 | } |
1448 | fdb_notify(br, fdb, RTM_NEWNEIGH, swdev_notify); |
1449 | } else { |
1450 | if (locked && |
1451 | (!test_bit(BR_FDB_LOCKED, &fdb->flags) || |
1452 | READ_ONCE(fdb->dst) != p)) { |
1453 | err = -EINVAL; |
1454 | goto err_unlock; |
1455 | } |
1456 | |
1457 | fdb->updated = jiffies; |
1458 | |
1459 | if (READ_ONCE(fdb->dst) != p) { |
1460 | WRITE_ONCE(fdb->dst, p); |
1461 | modified = true; |
1462 | } |
1463 | |
1464 | if (test_and_set_bit(nr: BR_FDB_ADDED_BY_EXT_LEARN, addr: &fdb->flags)) { |
1465 | /* Refresh entry */ |
1466 | fdb->used = jiffies; |
1467 | } else { |
1468 | modified = true; |
1469 | } |
1470 | |
1471 | if (locked != test_bit(BR_FDB_LOCKED, &fdb->flags)) { |
1472 | change_bit(nr: BR_FDB_LOCKED, addr: &fdb->flags); |
1473 | modified = true; |
1474 | } |
1475 | |
1476 | if (swdev_notify) |
1477 | set_bit(nr: BR_FDB_ADDED_BY_USER, addr: &fdb->flags); |
1478 | |
1479 | if (!p) |
1480 | set_bit(nr: BR_FDB_LOCAL, addr: &fdb->flags); |
1481 | |
1482 | if ((swdev_notify || !p) && |
1483 | test_and_clear_bit(nr: BR_FDB_DYNAMIC_LEARNED, addr: &fdb->flags)) |
1484 | atomic_dec(v: &br->fdb_n_learned); |
1485 | |
1486 | if (modified) |
1487 | fdb_notify(br, fdb, RTM_NEWNEIGH, swdev_notify); |
1488 | } |
1489 | |
1490 | err_unlock: |
1491 | spin_unlock_bh(lock: &br->hash_lock); |
1492 | |
1493 | return err; |
1494 | } |
1495 | |
1496 | int br_fdb_external_learn_del(struct net_bridge *br, struct net_bridge_port *p, |
1497 | const unsigned char *addr, u16 vid, |
1498 | bool swdev_notify) |
1499 | { |
1500 | struct net_bridge_fdb_entry *fdb; |
1501 | int err = 0; |
1502 | |
1503 | spin_lock_bh(lock: &br->hash_lock); |
1504 | |
1505 | fdb = br_fdb_find(br, addr, vid); |
1506 | if (fdb && test_bit(BR_FDB_ADDED_BY_EXT_LEARN, &fdb->flags)) |
1507 | fdb_delete(br, f: fdb, swdev_notify); |
1508 | else |
1509 | err = -ENOENT; |
1510 | |
1511 | spin_unlock_bh(lock: &br->hash_lock); |
1512 | |
1513 | return err; |
1514 | } |
1515 | |
1516 | void br_fdb_offloaded_set(struct net_bridge *br, struct net_bridge_port *p, |
1517 | const unsigned char *addr, u16 vid, bool offloaded) |
1518 | { |
1519 | struct net_bridge_fdb_entry *fdb; |
1520 | |
1521 | spin_lock_bh(lock: &br->hash_lock); |
1522 | |
1523 | fdb = br_fdb_find(br, addr, vid); |
1524 | if (fdb && offloaded != test_bit(BR_FDB_OFFLOADED, &fdb->flags)) |
1525 | change_bit(nr: BR_FDB_OFFLOADED, addr: &fdb->flags); |
1526 | |
1527 | spin_unlock_bh(lock: &br->hash_lock); |
1528 | } |
1529 | |
1530 | void br_fdb_clear_offload(const struct net_device *dev, u16 vid) |
1531 | { |
1532 | struct net_bridge_fdb_entry *f; |
1533 | struct net_bridge_port *p; |
1534 | |
1535 | ASSERT_RTNL(); |
1536 | |
1537 | p = br_port_get_rtnl(dev); |
1538 | if (!p) |
1539 | return; |
1540 | |
1541 | spin_lock_bh(lock: &p->br->hash_lock); |
1542 | hlist_for_each_entry(f, &p->br->fdb_list, fdb_node) { |
1543 | if (f->dst == p && f->key.vlan_id == vid) |
1544 | clear_bit(nr: BR_FDB_OFFLOADED, addr: &f->flags); |
1545 | } |
1546 | spin_unlock_bh(lock: &p->br->hash_lock); |
1547 | } |
1548 | EXPORT_SYMBOL_GPL(br_fdb_clear_offload); |
1549 |
Definitions
- br_fdb_rht_params
- br_fdb_cache
- br_fdb_init
- br_fdb_fini
- br_fdb_hash_init
- br_fdb_hash_fini
- hold_time
- has_expired
- fdb_to_nud
- fdb_fill_info
- fdb_nlmsg_size
- fdb_notify
- fdb_find_rcu
- br_fdb_find
- br_fdb_find_port
- br_fdb_find_rcu
- fdb_add_hw_addr
- fdb_del_hw_addr
- fdb_delete
- fdb_delete_local
- br_fdb_find_delete_local
- fdb_create
- fdb_add_local
- br_fdb_changeaddr
- br_fdb_change_mac_address
- br_fdb_cleanup
- __fdb_flush_matches
- br_fdb_flush
- __ndm_state_to_fdb_flags
- __ndm_flags_to_fdb_flags
- __fdb_flush_validate_ifindex
- br_fdb_del_bulk_policy
- br_fdb_delete_bulk
- br_fdb_delete_by_port
- br_fdb_test_addr
- br_fdb_fillbuf
- br_fdb_add_local
- __fdb_mark_active
- br_fdb_update
- br_fdb_dump
- br_fdb_get
- fdb_handle_notify
- fdb_add_entry
- __br_fdb_add
- br_nda_fdb_pol
- br_fdb_add
- fdb_delete_by_addr_and_port
- __br_fdb_delete
- br_fdb_delete
- br_fdb_sync_static
- br_fdb_unsync_static
- br_fdb_external_learn_add
- br_fdb_external_learn_del
- br_fdb_offloaded_set
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