Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Forwarding database | |
3 | * Linux ethernet bridge | |
4 | * | |
5 | * Authors: | |
6 | * Lennert Buytenhek <buytenh@gnu.org> | |
7 | * | |
1da177e4 LT |
8 | * This program is free software; you can redistribute it and/or |
9 | * modify it under the terms of the GNU General Public License | |
10 | * as published by the Free Software Foundation; either version | |
11 | * 2 of the License, or (at your option) any later version. | |
12 | */ | |
13 | ||
14 | #include <linux/kernel.h> | |
15 | #include <linux/init.h> | |
82524746 | 16 | #include <linux/rculist.h> |
1da177e4 LT |
17 | #include <linux/spinlock.h> |
18 | #include <linux/times.h> | |
19 | #include <linux/netdevice.h> | |
20 | #include <linux/etherdevice.h> | |
21 | #include <linux/jhash.h> | |
3f890923 | 22 | #include <linux/random.h> |
5a0e3ad6 | 23 | #include <linux/slab.h> |
60063497 | 24 | #include <linux/atomic.h> |
3f890923 | 25 | #include <asm/unaligned.h> |
2ba071ec | 26 | #include <linux/if_vlan.h> |
1da177e4 LT |
27 | #include "br_private.h" |
28 | ||
e18b890b | 29 | static struct kmem_cache *br_fdb_cache __read_mostly; |
1da177e4 LT |
30 | static int fdb_insert(struct net_bridge *br, struct net_bridge_port *source, |
31 | const unsigned char *addr); | |
31e8a49c | 32 | static void fdb_notify(struct net_bridge *br, |
33 | const struct net_bridge_fdb_entry *, int); | |
1da177e4 | 34 | |
3f890923 SH |
35 | static u32 fdb_salt __read_mostly; |
36 | ||
87a596e0 | 37 | int __init br_fdb_init(void) |
1da177e4 LT |
38 | { |
39 | br_fdb_cache = kmem_cache_create("bridge_fdb_cache", | |
40 | sizeof(struct net_bridge_fdb_entry), | |
41 | 0, | |
20c2df83 | 42 | SLAB_HWCACHE_ALIGN, NULL); |
87a596e0 AM |
43 | if (!br_fdb_cache) |
44 | return -ENOMEM; | |
45 | ||
3f890923 | 46 | get_random_bytes(&fdb_salt, sizeof(fdb_salt)); |
87a596e0 | 47 | return 0; |
1da177e4 LT |
48 | } |
49 | ||
73afc906 | 50 | void br_fdb_fini(void) |
1da177e4 LT |
51 | { |
52 | kmem_cache_destroy(br_fdb_cache); | |
53 | } | |
54 | ||
55 | ||
56 | /* if topology_changing then use forward_delay (default 15 sec) | |
57 | * otherwise keep longer (default 5 minutes) | |
58 | */ | |
3f890923 | 59 | static inline unsigned long hold_time(const struct net_bridge *br) |
1da177e4 LT |
60 | { |
61 | return br->topology_change ? br->forward_delay : br->ageing_time; | |
62 | } | |
63 | ||
3f890923 | 64 | static inline int has_expired(const struct net_bridge *br, |
1da177e4 LT |
65 | const struct net_bridge_fdb_entry *fdb) |
66 | { | |
f64f9e71 | 67 | return !fdb->is_static && |
7cd8861a | 68 | time_before_eq(fdb->updated + hold_time(br), jiffies); |
1da177e4 LT |
69 | } |
70 | ||
2ba071ec | 71 | static inline int br_mac_hash(const unsigned char *mac, __u16 vid) |
1da177e4 | 72 | { |
2ba071ec | 73 | /* use 1 byte of OUI and 3 bytes of NIC */ |
3f890923 | 74 | u32 key = get_unaligned((u32 *)(mac + 2)); |
2ba071ec | 75 | return jhash_2words(key, vid, fdb_salt) & (BR_HASH_SIZE - 1); |
1da177e4 LT |
76 | } |
77 | ||
da678292 MM |
78 | static void fdb_rcu_free(struct rcu_head *head) |
79 | { | |
80 | struct net_bridge_fdb_entry *ent | |
81 | = container_of(head, struct net_bridge_fdb_entry, rcu); | |
82 | kmem_cache_free(br_fdb_cache, ent); | |
83 | } | |
84 | ||
31e8a49c | 85 | static void fdb_delete(struct net_bridge *br, struct net_bridge_fdb_entry *f) |
1da177e4 LT |
86 | { |
87 | hlist_del_rcu(&f->hlist); | |
31e8a49c | 88 | fdb_notify(br, f, RTM_DELNEIGH); |
da678292 | 89 | call_rcu(&f->rcu, fdb_rcu_free); |
1da177e4 LT |
90 | } |
91 | ||
92 | void br_fdb_changeaddr(struct net_bridge_port *p, const unsigned char *newaddr) | |
93 | { | |
94 | struct net_bridge *br = p->br; | |
95 | int i; | |
9d6f229f | 96 | |
1da177e4 LT |
97 | spin_lock_bh(&br->hash_lock); |
98 | ||
99 | /* Search all chains since old address/hash is unknown */ | |
100 | for (i = 0; i < BR_HASH_SIZE; i++) { | |
101 | struct hlist_node *h; | |
102 | hlist_for_each(h, &br->hash[i]) { | |
103 | struct net_bridge_fdb_entry *f; | |
104 | ||
105 | f = hlist_entry(h, struct net_bridge_fdb_entry, hlist); | |
106 | if (f->dst == p && f->is_local) { | |
107 | /* maybe another port has same hw addr? */ | |
108 | struct net_bridge_port *op; | |
109 | list_for_each_entry(op, &br->port_list, list) { | |
9d6f229f | 110 | if (op != p && |
9a7b6ef9 JP |
111 | ether_addr_equal(op->dev->dev_addr, |
112 | f->addr.addr)) { | |
1da177e4 LT |
113 | f->dst = op; |
114 | goto insert; | |
115 | } | |
116 | } | |
117 | ||
118 | /* delete old one */ | |
31e8a49c | 119 | fdb_delete(br, f); |
1da177e4 LT |
120 | goto insert; |
121 | } | |
122 | } | |
123 | } | |
124 | insert: | |
125 | /* insert new address, may fail if invalid address or dup. */ | |
126 | fdb_insert(br, p, newaddr); | |
127 | ||
128 | spin_unlock_bh(&br->hash_lock); | |
129 | } | |
130 | ||
43598813 | 131 | void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr) |
132 | { | |
133 | struct net_bridge_fdb_entry *f; | |
134 | ||
135 | /* If old entry was unassociated with any port, then delete it. */ | |
2ba071ec | 136 | f = __br_fdb_get(br, br->dev->dev_addr, 0); |
43598813 | 137 | if (f && f->is_local && !f->dst) |
138 | fdb_delete(br, f); | |
139 | ||
140 | fdb_insert(br, NULL, newaddr); | |
141 | } | |
142 | ||
1da177e4 LT |
143 | void br_fdb_cleanup(unsigned long _data) |
144 | { | |
145 | struct net_bridge *br = (struct net_bridge *)_data; | |
146 | unsigned long delay = hold_time(br); | |
25442e06 | 147 | unsigned long next_timer = jiffies + br->ageing_time; |
1da177e4 LT |
148 | int i; |
149 | ||
27a42938 | 150 | spin_lock(&br->hash_lock); |
1da177e4 LT |
151 | for (i = 0; i < BR_HASH_SIZE; i++) { |
152 | struct net_bridge_fdb_entry *f; | |
153 | struct hlist_node *h, *n; | |
154 | ||
155 | hlist_for_each_entry_safe(f, h, n, &br->hash[i], hlist) { | |
071f7722 BE |
156 | unsigned long this_timer; |
157 | if (f->is_static) | |
158 | continue; | |
7cd8861a | 159 | this_timer = f->updated + delay; |
071f7722 | 160 | if (time_before_eq(this_timer, jiffies)) |
31e8a49c | 161 | fdb_delete(br, f); |
2bec008c | 162 | else if (time_before(this_timer, next_timer)) |
071f7722 | 163 | next_timer = this_timer; |
1da177e4 LT |
164 | } |
165 | } | |
27a42938 | 166 | spin_unlock(&br->hash_lock); |
1da177e4 | 167 | |
25442e06 | 168 | mod_timer(&br->gc_timer, round_jiffies_up(next_timer)); |
1da177e4 LT |
169 | } |
170 | ||
9cf63747 SH |
171 | /* Completely flush all dynamic entries in forwarding database.*/ |
172 | void br_fdb_flush(struct net_bridge *br) | |
173 | { | |
174 | int i; | |
175 | ||
176 | spin_lock_bh(&br->hash_lock); | |
177 | for (i = 0; i < BR_HASH_SIZE; i++) { | |
178 | struct net_bridge_fdb_entry *f; | |
179 | struct hlist_node *h, *n; | |
180 | hlist_for_each_entry_safe(f, h, n, &br->hash[i], hlist) { | |
181 | if (!f->is_static) | |
31e8a49c | 182 | fdb_delete(br, f); |
9cf63747 SH |
183 | } |
184 | } | |
185 | spin_unlock_bh(&br->hash_lock); | |
186 | } | |
1a620698 | 187 | |
25985edc | 188 | /* Flush all entries referring to a specific port. |
9cf63747 SH |
189 | * if do_all is set also flush static entries |
190 | */ | |
1a620698 SH |
191 | void br_fdb_delete_by_port(struct net_bridge *br, |
192 | const struct net_bridge_port *p, | |
193 | int do_all) | |
1da177e4 LT |
194 | { |
195 | int i; | |
196 | ||
197 | spin_lock_bh(&br->hash_lock); | |
198 | for (i = 0; i < BR_HASH_SIZE; i++) { | |
199 | struct hlist_node *h, *g; | |
9d6f229f | 200 | |
1da177e4 LT |
201 | hlist_for_each_safe(h, g, &br->hash[i]) { |
202 | struct net_bridge_fdb_entry *f | |
203 | = hlist_entry(h, struct net_bridge_fdb_entry, hlist); | |
9d6f229f | 204 | if (f->dst != p) |
1da177e4 LT |
205 | continue; |
206 | ||
1a620698 SH |
207 | if (f->is_static && !do_all) |
208 | continue; | |
1da177e4 LT |
209 | /* |
210 | * if multiple ports all have the same device address | |
211 | * then when one port is deleted, assign | |
212 | * the local entry to other port | |
213 | */ | |
214 | if (f->is_local) { | |
215 | struct net_bridge_port *op; | |
216 | list_for_each_entry(op, &br->port_list, list) { | |
9d6f229f | 217 | if (op != p && |
9a7b6ef9 JP |
218 | ether_addr_equal(op->dev->dev_addr, |
219 | f->addr.addr)) { | |
1da177e4 LT |
220 | f->dst = op; |
221 | goto skip_delete; | |
222 | } | |
223 | } | |
224 | } | |
225 | ||
31e8a49c | 226 | fdb_delete(br, f); |
1da177e4 LT |
227 | skip_delete: ; |
228 | } | |
229 | } | |
230 | spin_unlock_bh(&br->hash_lock); | |
231 | } | |
232 | ||
eeaf61d8 | 233 | /* No locking or refcounting, assumes caller has rcu_read_lock */ |
1da177e4 | 234 | struct net_bridge_fdb_entry *__br_fdb_get(struct net_bridge *br, |
2ba071ec VY |
235 | const unsigned char *addr, |
236 | __u16 vid) | |
1da177e4 LT |
237 | { |
238 | struct hlist_node *h; | |
239 | struct net_bridge_fdb_entry *fdb; | |
240 | ||
2ba071ec VY |
241 | hlist_for_each_entry_rcu(fdb, h, |
242 | &br->hash[br_mac_hash(addr, vid)], hlist) { | |
243 | if (ether_addr_equal(fdb->addr.addr, addr) && | |
244 | fdb->vlan_id == vid) { | |
1da177e4 LT |
245 | if (unlikely(has_expired(br, fdb))) |
246 | break; | |
247 | return fdb; | |
248 | } | |
249 | } | |
250 | ||
251 | return NULL; | |
252 | } | |
253 | ||
e6373c4c | 254 | #if IS_ENABLED(CONFIG_ATM_LANE) |
da678292 MM |
255 | /* Interface used by ATM LANE hook to test |
256 | * if an addr is on some other bridge port */ | |
257 | int br_fdb_test_addr(struct net_device *dev, unsigned char *addr) | |
1da177e4 LT |
258 | { |
259 | struct net_bridge_fdb_entry *fdb; | |
b5ed54e9 | 260 | struct net_bridge_port *port; |
da678292 MM |
261 | int ret; |
262 | ||
1da177e4 | 263 | rcu_read_lock(); |
b5ed54e9 | 264 | port = br_port_get_rcu(dev); |
265 | if (!port) | |
266 | ret = 0; | |
267 | else { | |
2ba071ec | 268 | fdb = __br_fdb_get(port->br, addr, 0); |
43598813 | 269 | ret = fdb && fdb->dst && fdb->dst->dev != dev && |
b5ed54e9 | 270 | fdb->dst->state == BR_STATE_FORWARDING; |
271 | } | |
1da177e4 | 272 | rcu_read_unlock(); |
1da177e4 | 273 | |
da678292 | 274 | return ret; |
1da177e4 | 275 | } |
da678292 | 276 | #endif /* CONFIG_ATM_LANE */ |
1da177e4 LT |
277 | |
278 | /* | |
9d6f229f | 279 | * Fill buffer with forwarding table records in |
1da177e4 LT |
280 | * the API format. |
281 | */ | |
282 | int br_fdb_fillbuf(struct net_bridge *br, void *buf, | |
283 | unsigned long maxnum, unsigned long skip) | |
284 | { | |
285 | struct __fdb_entry *fe = buf; | |
286 | int i, num = 0; | |
287 | struct hlist_node *h; | |
288 | struct net_bridge_fdb_entry *f; | |
289 | ||
290 | memset(buf, 0, maxnum*sizeof(struct __fdb_entry)); | |
291 | ||
292 | rcu_read_lock(); | |
293 | for (i = 0; i < BR_HASH_SIZE; i++) { | |
294 | hlist_for_each_entry_rcu(f, h, &br->hash[i], hlist) { | |
295 | if (num >= maxnum) | |
296 | goto out; | |
297 | ||
9d6f229f | 298 | if (has_expired(br, f)) |
1da177e4 LT |
299 | continue; |
300 | ||
43598813 | 301 | /* ignore pseudo entry for local MAC address */ |
302 | if (!f->dst) | |
303 | continue; | |
304 | ||
1da177e4 LT |
305 | if (skip) { |
306 | --skip; | |
307 | continue; | |
308 | } | |
309 | ||
310 | /* convert from internal format to API */ | |
311 | memcpy(fe->mac_addr, f->addr.addr, ETH_ALEN); | |
ae4f8fca SH |
312 | |
313 | /* due to ABI compat need to split into hi/lo */ | |
1da177e4 | 314 | fe->port_no = f->dst->port_no; |
ae4f8fca SH |
315 | fe->port_hi = f->dst->port_no >> 8; |
316 | ||
1da177e4 LT |
317 | fe->is_local = f->is_local; |
318 | if (!f->is_static) | |
a399a805 | 319 | fe->ageing_timer_value = jiffies_delta_to_clock_t(jiffies - f->updated); |
1da177e4 LT |
320 | ++fe; |
321 | ++num; | |
322 | } | |
323 | } | |
324 | ||
325 | out: | |
326 | rcu_read_unlock(); | |
327 | ||
328 | return num; | |
329 | } | |
330 | ||
664de48b | 331 | static struct net_bridge_fdb_entry *fdb_find(struct hlist_head *head, |
2ba071ec VY |
332 | const unsigned char *addr, |
333 | __u16 vid) | |
664de48b | 334 | { |
335 | struct hlist_node *h; | |
336 | struct net_bridge_fdb_entry *fdb; | |
337 | ||
338 | hlist_for_each_entry(fdb, h, head, hlist) { | |
2ba071ec VY |
339 | if (ether_addr_equal(fdb->addr.addr, addr) && |
340 | fdb->vlan_id == vid) | |
664de48b | 341 | return fdb; |
342 | } | |
343 | return NULL; | |
344 | } | |
345 | ||
346 | static struct net_bridge_fdb_entry *fdb_find_rcu(struct hlist_head *head, | |
2ba071ec VY |
347 | const unsigned char *addr, |
348 | __u16 vid) | |
1da177e4 LT |
349 | { |
350 | struct hlist_node *h; | |
351 | struct net_bridge_fdb_entry *fdb; | |
352 | ||
353 | hlist_for_each_entry_rcu(fdb, h, head, hlist) { | |
2ba071ec VY |
354 | if (ether_addr_equal(fdb->addr.addr, addr) && |
355 | fdb->vlan_id == vid) | |
1da177e4 LT |
356 | return fdb; |
357 | } | |
358 | return NULL; | |
359 | } | |
360 | ||
361 | static struct net_bridge_fdb_entry *fdb_create(struct hlist_head *head, | |
362 | struct net_bridge_port *source, | |
2ba071ec VY |
363 | const unsigned char *addr, |
364 | __u16 vid) | |
1da177e4 LT |
365 | { |
366 | struct net_bridge_fdb_entry *fdb; | |
367 | ||
368 | fdb = kmem_cache_alloc(br_fdb_cache, GFP_ATOMIC); | |
369 | if (fdb) { | |
370 | memcpy(fdb->addr.addr, addr, ETH_ALEN); | |
1da177e4 | 371 | fdb->dst = source; |
2ba071ec | 372 | fdb->vlan_id = vid; |
03e9b64b | 373 | fdb->is_local = 0; |
374 | fdb->is_static = 0; | |
7cd8861a | 375 | fdb->updated = fdb->used = jiffies; |
1158f762 | 376 | hlist_add_head_rcu(&fdb->hlist, head); |
1da177e4 LT |
377 | } |
378 | return fdb; | |
379 | } | |
380 | ||
381 | static int fdb_insert(struct net_bridge *br, struct net_bridge_port *source, | |
382 | const unsigned char *addr) | |
383 | { | |
2ba071ec | 384 | struct hlist_head *head = &br->hash[br_mac_hash(addr, 0)]; |
1da177e4 LT |
385 | struct net_bridge_fdb_entry *fdb; |
386 | ||
387 | if (!is_valid_ether_addr(addr)) | |
388 | return -EINVAL; | |
389 | ||
2ba071ec | 390 | fdb = fdb_find(head, addr, 0); |
1da177e4 | 391 | if (fdb) { |
9d6f229f | 392 | /* it is okay to have multiple ports with same |
1da177e4 LT |
393 | * address, just use the first one. |
394 | */ | |
9d6f229f | 395 | if (fdb->is_local) |
1da177e4 | 396 | return 0; |
28a16c97 | 397 | br_warn(br, "adding interface %s with same address " |
1da177e4 LT |
398 | "as a received packet\n", |
399 | source->dev->name); | |
31e8a49c | 400 | fdb_delete(br, fdb); |
9d6f229f | 401 | } |
1da177e4 | 402 | |
2ba071ec | 403 | fdb = fdb_create(head, source, addr, 0); |
03e9b64b | 404 | if (!fdb) |
1da177e4 LT |
405 | return -ENOMEM; |
406 | ||
03e9b64b | 407 | fdb->is_local = fdb->is_static = 1; |
31e8a49c | 408 | fdb_notify(br, fdb, RTM_NEWNEIGH); |
1da177e4 LT |
409 | return 0; |
410 | } | |
411 | ||
03e9b64b | 412 | /* Add entry for local address of interface */ |
1da177e4 LT |
413 | int br_fdb_insert(struct net_bridge *br, struct net_bridge_port *source, |
414 | const unsigned char *addr) | |
415 | { | |
416 | int ret; | |
417 | ||
418 | spin_lock_bh(&br->hash_lock); | |
419 | ret = fdb_insert(br, source, addr); | |
420 | spin_unlock_bh(&br->hash_lock); | |
421 | return ret; | |
422 | } | |
423 | ||
424 | void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source, | |
2ba071ec | 425 | const unsigned char *addr, u16 vid) |
1da177e4 | 426 | { |
2ba071ec | 427 | struct hlist_head *head = &br->hash[br_mac_hash(addr, vid)]; |
1da177e4 LT |
428 | struct net_bridge_fdb_entry *fdb; |
429 | ||
430 | /* some users want to always flood. */ | |
431 | if (hold_time(br) == 0) | |
432 | return; | |
433 | ||
df1c0b84 SH |
434 | /* ignore packets unless we are using this port */ |
435 | if (!(source->state == BR_STATE_LEARNING || | |
436 | source->state == BR_STATE_FORWARDING)) | |
437 | return; | |
438 | ||
2ba071ec | 439 | fdb = fdb_find_rcu(head, addr, vid); |
1da177e4 LT |
440 | if (likely(fdb)) { |
441 | /* attempt to update an entry for a local interface */ | |
442 | if (unlikely(fdb->is_local)) { | |
9d6f229f | 443 | if (net_ratelimit()) |
28a16c97 | 444 | br_warn(br, "received packet on %s with " |
445 | "own address as source address\n", | |
446 | source->dev->name); | |
1da177e4 LT |
447 | } else { |
448 | /* fastpath: update of existing entry */ | |
449 | fdb->dst = source; | |
7cd8861a | 450 | fdb->updated = jiffies; |
1da177e4 LT |
451 | } |
452 | } else { | |
f8ae737d | 453 | spin_lock(&br->hash_lock); |
2ba071ec VY |
454 | if (likely(!fdb_find(head, addr, vid))) { |
455 | fdb = fdb_create(head, source, addr, vid); | |
f58ee4e1 | 456 | if (fdb) |
31e8a49c | 457 | fdb_notify(br, fdb, RTM_NEWNEIGH); |
f58ee4e1 | 458 | } |
1da177e4 LT |
459 | /* else we lose race and someone else inserts |
460 | * it first, don't bother updating | |
461 | */ | |
f8ae737d | 462 | spin_unlock(&br->hash_lock); |
1da177e4 | 463 | } |
1da177e4 | 464 | } |
b078f0df | 465 | |
466 | static int fdb_to_nud(const struct net_bridge_fdb_entry *fdb) | |
467 | { | |
468 | if (fdb->is_local) | |
469 | return NUD_PERMANENT; | |
470 | else if (fdb->is_static) | |
471 | return NUD_NOARP; | |
472 | else if (has_expired(fdb->dst->br, fdb)) | |
473 | return NUD_STALE; | |
474 | else | |
475 | return NUD_REACHABLE; | |
476 | } | |
477 | ||
31e8a49c | 478 | static int fdb_fill_info(struct sk_buff *skb, const struct net_bridge *br, |
b078f0df | 479 | const struct net_bridge_fdb_entry *fdb, |
15e47304 | 480 | u32 portid, u32 seq, int type, unsigned int flags) |
b078f0df | 481 | { |
482 | unsigned long now = jiffies; | |
483 | struct nda_cacheinfo ci; | |
484 | struct nlmsghdr *nlh; | |
485 | struct ndmsg *ndm; | |
486 | ||
15e47304 | 487 | nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags); |
b078f0df | 488 | if (nlh == NULL) |
489 | return -EMSGSIZE; | |
490 | ||
b078f0df | 491 | ndm = nlmsg_data(nlh); |
492 | ndm->ndm_family = AF_BRIDGE; | |
493 | ndm->ndm_pad1 = 0; | |
494 | ndm->ndm_pad2 = 0; | |
495 | ndm->ndm_flags = 0; | |
496 | ndm->ndm_type = 0; | |
43598813 | 497 | ndm->ndm_ifindex = fdb->dst ? fdb->dst->dev->ifindex : br->dev->ifindex; |
b078f0df | 498 | ndm->ndm_state = fdb_to_nud(fdb); |
499 | ||
2eb812e6 DM |
500 | if (nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->addr)) |
501 | goto nla_put_failure; | |
b078f0df | 502 | ci.ndm_used = jiffies_to_clock_t(now - fdb->used); |
503 | ci.ndm_confirmed = 0; | |
504 | ci.ndm_updated = jiffies_to_clock_t(now - fdb->updated); | |
505 | ci.ndm_refcnt = 0; | |
2eb812e6 DM |
506 | if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci)) |
507 | goto nla_put_failure; | |
1690be63 VY |
508 | |
509 | if (nla_put(skb, NDA_VLAN, sizeof(u16), &fdb->vlan_id)) | |
510 | goto nla_put_failure; | |
511 | ||
b078f0df | 512 | return nlmsg_end(skb, nlh); |
513 | ||
514 | nla_put_failure: | |
515 | nlmsg_cancel(skb, nlh); | |
516 | return -EMSGSIZE; | |
517 | } | |
518 | ||
519 | static inline size_t fdb_nlmsg_size(void) | |
520 | { | |
521 | return NLMSG_ALIGN(sizeof(struct ndmsg)) | |
522 | + nla_total_size(ETH_ALEN) /* NDA_LLADDR */ | |
1690be63 | 523 | + nla_total_size(sizeof(u16)) /* NDA_VLAN */ |
b078f0df | 524 | + nla_total_size(sizeof(struct nda_cacheinfo)); |
525 | } | |
526 | ||
31e8a49c | 527 | static void fdb_notify(struct net_bridge *br, |
528 | const struct net_bridge_fdb_entry *fdb, int type) | |
b078f0df | 529 | { |
31e8a49c | 530 | struct net *net = dev_net(br->dev); |
b078f0df | 531 | struct sk_buff *skb; |
532 | int err = -ENOBUFS; | |
533 | ||
534 | skb = nlmsg_new(fdb_nlmsg_size(), GFP_ATOMIC); | |
535 | if (skb == NULL) | |
536 | goto errout; | |
537 | ||
31e8a49c | 538 | err = fdb_fill_info(skb, br, fdb, 0, 0, type, 0); |
b078f0df | 539 | if (err < 0) { |
540 | /* -EMSGSIZE implies BUG in fdb_nlmsg_size() */ | |
541 | WARN_ON(err == -EMSGSIZE); | |
542 | kfree_skb(skb); | |
543 | goto errout; | |
544 | } | |
545 | rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC); | |
546 | return; | |
547 | errout: | |
548 | if (err < 0) | |
549 | rtnl_set_sk_err(net, RTNLGRP_NEIGH, err); | |
550 | } | |
551 | ||
552 | /* Dump information about entries, in response to GETNEIGH */ | |
77162022 JF |
553 | int br_fdb_dump(struct sk_buff *skb, |
554 | struct netlink_callback *cb, | |
555 | struct net_device *dev, | |
556 | int idx) | |
b078f0df | 557 | { |
77162022 JF |
558 | struct net_bridge *br = netdev_priv(dev); |
559 | int i; | |
b078f0df | 560 | |
77162022 JF |
561 | if (!(dev->priv_flags & IFF_EBRIDGE)) |
562 | goto out; | |
b078f0df | 563 | |
77162022 JF |
564 | for (i = 0; i < BR_HASH_SIZE; i++) { |
565 | struct hlist_node *h; | |
566 | struct net_bridge_fdb_entry *f; | |
b078f0df | 567 | |
77162022 JF |
568 | hlist_for_each_entry_rcu(f, h, &br->hash[i], hlist) { |
569 | if (idx < cb->args[0]) | |
570 | goto skip; | |
571 | ||
572 | if (fdb_fill_info(skb, br, f, | |
15e47304 | 573 | NETLINK_CB(cb->skb).portid, |
77162022 JF |
574 | cb->nlh->nlmsg_seq, |
575 | RTM_NEWNEIGH, | |
576 | NLM_F_MULTI) < 0) | |
577 | break; | |
b078f0df | 578 | skip: |
77162022 | 579 | ++idx; |
b078f0df | 580 | } |
581 | } | |
b078f0df | 582 | |
77162022 JF |
583 | out: |
584 | return idx; | |
b078f0df | 585 | } |
36fd2b63 | 586 | |
292d1398 | 587 | /* Update (create or replace) forwarding database entry */ |
36fd2b63 | 588 | static int fdb_add_entry(struct net_bridge_port *source, const __u8 *addr, |
2ba071ec | 589 | __u16 state, __u16 flags, __u16 vid) |
36fd2b63 | 590 | { |
591 | struct net_bridge *br = source->br; | |
2ba071ec | 592 | struct hlist_head *head = &br->hash[br_mac_hash(addr, vid)]; |
36fd2b63 | 593 | struct net_bridge_fdb_entry *fdb; |
594 | ||
2ba071ec | 595 | fdb = fdb_find(head, addr, vid); |
64af1bac | 596 | if (fdb == NULL) { |
597 | if (!(flags & NLM_F_CREATE)) | |
598 | return -ENOENT; | |
36fd2b63 | 599 | |
2ba071ec | 600 | fdb = fdb_create(head, source, addr, vid); |
64af1bac | 601 | if (!fdb) |
602 | return -ENOMEM; | |
31e8a49c | 603 | fdb_notify(br, fdb, RTM_NEWNEIGH); |
64af1bac | 604 | } else { |
605 | if (flags & NLM_F_EXCL) | |
606 | return -EEXIST; | |
292d1398 | 607 | } |
608 | ||
609 | if (fdb_to_nud(fdb) != state) { | |
610 | if (state & NUD_PERMANENT) | |
611 | fdb->is_local = fdb->is_static = 1; | |
612 | else if (state & NUD_NOARP) { | |
613 | fdb->is_local = 0; | |
614 | fdb->is_static = 1; | |
615 | } else | |
616 | fdb->is_local = fdb->is_static = 0; | |
64af1bac | 617 | |
292d1398 | 618 | fdb->updated = fdb->used = jiffies; |
31e8a49c | 619 | fdb_notify(br, fdb, RTM_NEWNEIGH); |
64af1bac | 620 | } |
36fd2b63 | 621 | |
36fd2b63 | 622 | return 0; |
623 | } | |
624 | ||
1690be63 VY |
625 | static int __br_fdb_add(struct ndmsg *ndm, struct net_bridge_port *p, |
626 | const unsigned char *addr, u16 nlh_flags, u16 vid) | |
627 | { | |
628 | int err = 0; | |
629 | ||
630 | if (ndm->ndm_flags & NTF_USE) { | |
631 | rcu_read_lock(); | |
632 | br_fdb_update(p->br, p, addr, vid); | |
633 | rcu_read_unlock(); | |
634 | } else { | |
635 | spin_lock_bh(&p->br->hash_lock); | |
636 | err = fdb_add_entry(p, addr, ndm->ndm_state, | |
637 | nlh_flags, vid); | |
638 | spin_unlock_bh(&p->br->hash_lock); | |
639 | } | |
640 | ||
641 | return err; | |
642 | } | |
643 | ||
36fd2b63 | 644 | /* Add new permanent fdb entry with RTM_NEWNEIGH */ |
edc7d573 | 645 | int br_fdb_add(struct ndmsg *ndm, struct nlattr *tb[], |
646 | struct net_device *dev, | |
6b6e2725 | 647 | const unsigned char *addr, u16 nlh_flags) |
36fd2b63 | 648 | { |
36fd2b63 | 649 | struct net_bridge_port *p; |
77162022 | 650 | int err = 0; |
1690be63 VY |
651 | struct net_port_vlans *pv; |
652 | unsigned short vid = VLAN_N_VID; | |
36fd2b63 | 653 | |
292d1398 | 654 | if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_NOARP|NUD_REACHABLE))) { |
655 | pr_info("bridge: RTM_NEWNEIGH with invalid state %#x\n", ndm->ndm_state); | |
656 | return -EINVAL; | |
657 | } | |
658 | ||
1690be63 VY |
659 | if (tb[NDA_VLAN]) { |
660 | if (nla_len(tb[NDA_VLAN]) != sizeof(unsigned short)) { | |
661 | pr_info("bridge: RTM_NEWNEIGH with invalid vlan\n"); | |
662 | return -EINVAL; | |
663 | } | |
664 | ||
665 | vid = nla_get_u16(tb[NDA_VLAN]); | |
666 | ||
667 | if (vid >= VLAN_N_VID) { | |
668 | pr_info("bridge: RTM_NEWNEIGH with invalid vlan id %d\n", | |
669 | vid); | |
670 | return -EINVAL; | |
671 | } | |
672 | } | |
673 | ||
36fd2b63 | 674 | p = br_port_get_rtnl(dev); |
675 | if (p == NULL) { | |
676 | pr_info("bridge: RTM_NEWNEIGH %s not a bridge port\n", | |
677 | dev->name); | |
678 | return -EINVAL; | |
679 | } | |
680 | ||
1690be63 VY |
681 | pv = nbp_get_vlan_info(p); |
682 | if (vid != VLAN_N_VID) { | |
683 | if (!pv || !test_bit(vid, pv->vlan_bitmap)) { | |
684 | pr_info("bridge: RTM_NEWNEIGH with unconfigured " | |
685 | "vlan %d on port %s\n", vid, dev->name); | |
686 | return -EINVAL; | |
687 | } | |
688 | ||
689 | /* VID was specified, so use it. */ | |
690 | err = __br_fdb_add(ndm, p, addr, nlh_flags, vid); | |
292d1398 | 691 | } else { |
1690be63 VY |
692 | if (!pv || bitmap_empty(pv->vlan_bitmap, BR_VLAN_BITMAP_LEN)) { |
693 | err = __br_fdb_add(ndm, p, addr, nlh_flags, 0); | |
694 | goto out; | |
695 | } | |
696 | ||
697 | /* We have vlans configured on this port and user didn't | |
698 | * specify a VLAN. To be nice, add/update entry for every | |
699 | * vlan on this port. | |
700 | */ | |
701 | vid = find_first_bit(pv->vlan_bitmap, BR_VLAN_BITMAP_LEN); | |
702 | while (vid < BR_VLAN_BITMAP_LEN) { | |
703 | err = __br_fdb_add(ndm, p, addr, nlh_flags, vid); | |
704 | if (err) | |
705 | goto out; | |
706 | vid = find_next_bit(pv->vlan_bitmap, | |
707 | BR_VLAN_BITMAP_LEN, vid+1); | |
708 | } | |
292d1398 | 709 | } |
36fd2b63 | 710 | |
1690be63 | 711 | out: |
36fd2b63 | 712 | return err; |
713 | } | |
714 | ||
1690be63 VY |
715 | static int fdb_delete_by_addr(struct net_bridge *br, const u8 *addr, |
716 | u16 vlan) | |
36fd2b63 | 717 | { |
1690be63 | 718 | struct hlist_head *head = &br->hash[br_mac_hash(addr, vlan)]; |
36fd2b63 | 719 | struct net_bridge_fdb_entry *fdb; |
720 | ||
1690be63 | 721 | fdb = fdb_find(head, addr, vlan); |
36fd2b63 | 722 | if (!fdb) |
723 | return -ENOENT; | |
724 | ||
1690be63 | 725 | fdb_delete(br, fdb); |
36fd2b63 | 726 | return 0; |
727 | } | |
728 | ||
1690be63 VY |
729 | static int __br_fdb_delete(struct net_bridge_port *p, |
730 | const unsigned char *addr, u16 vid) | |
731 | { | |
732 | int err; | |
733 | ||
734 | spin_lock_bh(&p->br->hash_lock); | |
735 | err = fdb_delete_by_addr(p->br, addr, vid); | |
736 | spin_unlock_bh(&p->br->hash_lock); | |
737 | ||
738 | return err; | |
739 | } | |
740 | ||
36fd2b63 | 741 | /* Remove neighbor entry with RTM_DELNEIGH */ |
1690be63 VY |
742 | int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[], |
743 | struct net_device *dev, | |
6b6e2725 | 744 | const unsigned char *addr) |
36fd2b63 | 745 | { |
36fd2b63 | 746 | struct net_bridge_port *p; |
36fd2b63 | 747 | int err; |
1690be63 VY |
748 | struct net_port_vlans *pv; |
749 | unsigned short vid = VLAN_N_VID; | |
36fd2b63 | 750 | |
1690be63 VY |
751 | if (tb[NDA_VLAN]) { |
752 | if (nla_len(tb[NDA_VLAN]) != sizeof(unsigned short)) { | |
753 | pr_info("bridge: RTM_NEWNEIGH with invalid vlan\n"); | |
754 | return -EINVAL; | |
755 | } | |
756 | ||
757 | vid = nla_get_u16(tb[NDA_VLAN]); | |
758 | ||
759 | if (vid >= VLAN_N_VID) { | |
760 | pr_info("bridge: RTM_NEWNEIGH with invalid vlan id %d\n", | |
761 | vid); | |
762 | return -EINVAL; | |
763 | } | |
764 | } | |
36fd2b63 | 765 | p = br_port_get_rtnl(dev); |
766 | if (p == NULL) { | |
767 | pr_info("bridge: RTM_DELNEIGH %s not a bridge port\n", | |
768 | dev->name); | |
769 | return -EINVAL; | |
770 | } | |
771 | ||
1690be63 VY |
772 | pv = nbp_get_vlan_info(p); |
773 | if (vid != VLAN_N_VID) { | |
774 | if (!pv || !test_bit(vid, pv->vlan_bitmap)) { | |
775 | pr_info("bridge: RTM_DELNEIGH with unconfigured " | |
776 | "vlan %d on port %s\n", vid, dev->name); | |
777 | return -EINVAL; | |
778 | } | |
36fd2b63 | 779 | |
1690be63 VY |
780 | err = __br_fdb_delete(p, addr, vid); |
781 | } else { | |
782 | if (!pv || bitmap_empty(pv->vlan_bitmap, BR_VLAN_BITMAP_LEN)) { | |
783 | err = __br_fdb_delete(p, addr, 0); | |
784 | goto out; | |
785 | } | |
786 | ||
787 | /* We have vlans configured on this port and user didn't | |
788 | * specify a VLAN. To be nice, add/update entry for every | |
789 | * vlan on this port. | |
790 | */ | |
791 | err = -ENOENT; | |
792 | vid = find_first_bit(pv->vlan_bitmap, BR_VLAN_BITMAP_LEN); | |
793 | while (vid < BR_VLAN_BITMAP_LEN) { | |
794 | err &= __br_fdb_delete(p, addr, vid); | |
795 | vid = find_next_bit(pv->vlan_bitmap, | |
796 | BR_VLAN_BITMAP_LEN, vid+1); | |
797 | } | |
798 | } | |
799 | out: | |
36fd2b63 | 800 | return err; |
801 | } |