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; |
424bb9c9 TM |
30 | static struct net_bridge_fdb_entry *fdb_find(struct hlist_head *head, |
31 | const unsigned char *addr, | |
32 | __u16 vid); | |
1da177e4 | 33 | static int fdb_insert(struct net_bridge *br, struct net_bridge_port *source, |
bc9a25d2 | 34 | const unsigned char *addr, u16 vid); |
31e8a49c | 35 | static void fdb_notify(struct net_bridge *br, |
36 | const struct net_bridge_fdb_entry *, int); | |
1da177e4 | 37 | |
3f890923 SH |
38 | static u32 fdb_salt __read_mostly; |
39 | ||
87a596e0 | 40 | int __init br_fdb_init(void) |
1da177e4 LT |
41 | { |
42 | br_fdb_cache = kmem_cache_create("bridge_fdb_cache", | |
43 | sizeof(struct net_bridge_fdb_entry), | |
44 | 0, | |
20c2df83 | 45 | SLAB_HWCACHE_ALIGN, NULL); |
87a596e0 AM |
46 | if (!br_fdb_cache) |
47 | return -ENOMEM; | |
48 | ||
3f890923 | 49 | get_random_bytes(&fdb_salt, sizeof(fdb_salt)); |
87a596e0 | 50 | return 0; |
1da177e4 LT |
51 | } |
52 | ||
73afc906 | 53 | void br_fdb_fini(void) |
1da177e4 LT |
54 | { |
55 | kmem_cache_destroy(br_fdb_cache); | |
56 | } | |
57 | ||
58 | ||
59 | /* if topology_changing then use forward_delay (default 15 sec) | |
60 | * otherwise keep longer (default 5 minutes) | |
61 | */ | |
3f890923 | 62 | static inline unsigned long hold_time(const struct net_bridge *br) |
1da177e4 LT |
63 | { |
64 | return br->topology_change ? br->forward_delay : br->ageing_time; | |
65 | } | |
66 | ||
3f890923 | 67 | static inline int has_expired(const struct net_bridge *br, |
1da177e4 LT |
68 | const struct net_bridge_fdb_entry *fdb) |
69 | { | |
f64f9e71 | 70 | return !fdb->is_static && |
7cd8861a | 71 | time_before_eq(fdb->updated + hold_time(br), jiffies); |
1da177e4 LT |
72 | } |
73 | ||
2ba071ec | 74 | static inline int br_mac_hash(const unsigned char *mac, __u16 vid) |
1da177e4 | 75 | { |
2ba071ec | 76 | /* use 1 byte of OUI and 3 bytes of NIC */ |
3f890923 | 77 | u32 key = get_unaligned((u32 *)(mac + 2)); |
2ba071ec | 78 | return jhash_2words(key, vid, fdb_salt) & (BR_HASH_SIZE - 1); |
1da177e4 LT |
79 | } |
80 | ||
da678292 MM |
81 | static void fdb_rcu_free(struct rcu_head *head) |
82 | { | |
83 | struct net_bridge_fdb_entry *ent | |
84 | = container_of(head, struct net_bridge_fdb_entry, rcu); | |
85 | kmem_cache_free(br_fdb_cache, ent); | |
86 | } | |
87 | ||
31e8a49c | 88 | static void fdb_delete(struct net_bridge *br, struct net_bridge_fdb_entry *f) |
1da177e4 LT |
89 | { |
90 | hlist_del_rcu(&f->hlist); | |
31e8a49c | 91 | fdb_notify(br, f, RTM_DELNEIGH); |
da678292 | 92 | call_rcu(&f->rcu, fdb_rcu_free); |
1da177e4 LT |
93 | } |
94 | ||
960b589f TM |
95 | /* Delete a local entry if no other port had the same address. */ |
96 | static void fdb_delete_local(struct net_bridge *br, | |
97 | const struct net_bridge_port *p, | |
98 | struct net_bridge_fdb_entry *f) | |
99 | { | |
100 | const unsigned char *addr = f->addr.addr; | |
101 | u16 vid = f->vlan_id; | |
102 | struct net_bridge_port *op; | |
103 | ||
104 | /* Maybe another port has same hw addr? */ | |
105 | list_for_each_entry(op, &br->port_list, list) { | |
106 | if (op != p && ether_addr_equal(op->dev->dev_addr, addr) && | |
107 | (!vid || nbp_vlan_find(op, vid))) { | |
108 | f->dst = op; | |
a778e6d1 | 109 | f->added_by_user = 0; |
960b589f TM |
110 | return; |
111 | } | |
112 | } | |
113 | ||
114 | /* Maybe bridge device has same hw addr? */ | |
115 | if (p && ether_addr_equal(br->dev->dev_addr, addr) && | |
116 | (!vid || br_vlan_find(br, vid))) { | |
117 | f->dst = NULL; | |
a778e6d1 | 118 | f->added_by_user = 0; |
960b589f TM |
119 | return; |
120 | } | |
121 | ||
122 | fdb_delete(br, f); | |
123 | } | |
124 | ||
424bb9c9 TM |
125 | void br_fdb_find_delete_local(struct net_bridge *br, |
126 | const struct net_bridge_port *p, | |
127 | const unsigned char *addr, u16 vid) | |
128 | { | |
129 | struct hlist_head *head = &br->hash[br_mac_hash(addr, vid)]; | |
130 | struct net_bridge_fdb_entry *f; | |
131 | ||
132 | spin_lock_bh(&br->hash_lock); | |
133 | f = fdb_find(head, addr, vid); | |
134 | if (f && f->is_local && !f->added_by_user && f->dst == p) | |
135 | fdb_delete_local(br, p, f); | |
136 | spin_unlock_bh(&br->hash_lock); | |
137 | } | |
138 | ||
1da177e4 LT |
139 | void br_fdb_changeaddr(struct net_bridge_port *p, const unsigned char *newaddr) |
140 | { | |
141 | struct net_bridge *br = p->br; | |
2836882f TM |
142 | struct net_port_vlans *pv = nbp_get_vlan_info(p); |
143 | bool no_vlan = !pv; | |
1da177e4 | 144 | int i; |
2836882f | 145 | u16 vid; |
9d6f229f | 146 | |
1da177e4 LT |
147 | spin_lock_bh(&br->hash_lock); |
148 | ||
149 | /* Search all chains since old address/hash is unknown */ | |
150 | for (i = 0; i < BR_HASH_SIZE; i++) { | |
151 | struct hlist_node *h; | |
152 | hlist_for_each(h, &br->hash[i]) { | |
153 | struct net_bridge_fdb_entry *f; | |
154 | ||
155 | f = hlist_entry(h, struct net_bridge_fdb_entry, hlist); | |
a5642ab4 | 156 | if (f->dst == p && f->is_local && !f->added_by_user) { |
1da177e4 | 157 | /* delete old one */ |
960b589f TM |
158 | fdb_delete_local(br, p, f); |
159 | ||
bc9a25d2 VY |
160 | /* if this port has no vlan information |
161 | * configured, we can safely be done at | |
162 | * this point. | |
163 | */ | |
164 | if (no_vlan) | |
2836882f | 165 | goto insert; |
1da177e4 LT |
166 | } |
167 | } | |
168 | } | |
1da177e4 | 169 | |
2836882f TM |
170 | insert: |
171 | /* insert new address, may fail if invalid address or dup. */ | |
172 | fdb_insert(br, p, newaddr, 0); | |
173 | ||
174 | if (no_vlan) | |
175 | goto done; | |
176 | ||
177 | /* Now add entries for every VLAN configured on the port. | |
178 | * This function runs under RTNL so the bitmap will not change | |
179 | * from under us. | |
180 | */ | |
181 | for_each_set_bit(vid, pv->vlan_bitmap, VLAN_N_VID) | |
182 | fdb_insert(br, p, newaddr, vid); | |
183 | ||
bc9a25d2 | 184 | done: |
1da177e4 LT |
185 | spin_unlock_bh(&br->hash_lock); |
186 | } | |
187 | ||
43598813 | 188 | void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr) |
189 | { | |
190 | struct net_bridge_fdb_entry *f; | |
bc9a25d2 VY |
191 | struct net_port_vlans *pv; |
192 | u16 vid = 0; | |
43598813 | 193 | |
194 | /* If old entry was unassociated with any port, then delete it. */ | |
2ba071ec | 195 | f = __br_fdb_get(br, br->dev->dev_addr, 0); |
43598813 | 196 | if (f && f->is_local && !f->dst) |
960b589f | 197 | fdb_delete_local(br, NULL, f); |
43598813 | 198 | |
bc9a25d2 VY |
199 | fdb_insert(br, NULL, newaddr, 0); |
200 | ||
201 | /* Now remove and add entries for every VLAN configured on the | |
202 | * bridge. This function runs under RTNL so the bitmap will not | |
203 | * change from under us. | |
204 | */ | |
205 | pv = br_get_vlan_info(br); | |
206 | if (!pv) | |
207 | return; | |
208 | ||
ef40b7ef | 209 | for_each_set_bit_from(vid, pv->vlan_bitmap, VLAN_N_VID) { |
bc9a25d2 VY |
210 | f = __br_fdb_get(br, br->dev->dev_addr, vid); |
211 | if (f && f->is_local && !f->dst) | |
960b589f | 212 | fdb_delete_local(br, NULL, f); |
bc9a25d2 VY |
213 | fdb_insert(br, NULL, newaddr, vid); |
214 | } | |
43598813 | 215 | } |
216 | ||
1da177e4 LT |
217 | void br_fdb_cleanup(unsigned long _data) |
218 | { | |
219 | struct net_bridge *br = (struct net_bridge *)_data; | |
220 | unsigned long delay = hold_time(br); | |
25442e06 | 221 | unsigned long next_timer = jiffies + br->ageing_time; |
1da177e4 LT |
222 | int i; |
223 | ||
27a42938 | 224 | spin_lock(&br->hash_lock); |
1da177e4 LT |
225 | for (i = 0; i < BR_HASH_SIZE; i++) { |
226 | struct net_bridge_fdb_entry *f; | |
b67bfe0d | 227 | struct hlist_node *n; |
1da177e4 | 228 | |
b67bfe0d | 229 | hlist_for_each_entry_safe(f, n, &br->hash[i], hlist) { |
071f7722 BE |
230 | unsigned long this_timer; |
231 | if (f->is_static) | |
232 | continue; | |
7cd8861a | 233 | this_timer = f->updated + delay; |
071f7722 | 234 | if (time_before_eq(this_timer, jiffies)) |
31e8a49c | 235 | fdb_delete(br, f); |
2bec008c | 236 | else if (time_before(this_timer, next_timer)) |
071f7722 | 237 | next_timer = this_timer; |
1da177e4 LT |
238 | } |
239 | } | |
27a42938 | 240 | spin_unlock(&br->hash_lock); |
1da177e4 | 241 | |
25442e06 | 242 | mod_timer(&br->gc_timer, round_jiffies_up(next_timer)); |
1da177e4 LT |
243 | } |
244 | ||
9cf63747 SH |
245 | /* Completely flush all dynamic entries in forwarding database.*/ |
246 | void br_fdb_flush(struct net_bridge *br) | |
247 | { | |
248 | int i; | |
249 | ||
250 | spin_lock_bh(&br->hash_lock); | |
251 | for (i = 0; i < BR_HASH_SIZE; i++) { | |
252 | struct net_bridge_fdb_entry *f; | |
b67bfe0d SL |
253 | struct hlist_node *n; |
254 | hlist_for_each_entry_safe(f, n, &br->hash[i], hlist) { | |
9cf63747 | 255 | if (!f->is_static) |
31e8a49c | 256 | fdb_delete(br, f); |
9cf63747 SH |
257 | } |
258 | } | |
259 | spin_unlock_bh(&br->hash_lock); | |
260 | } | |
1a620698 | 261 | |
25985edc | 262 | /* Flush all entries referring to a specific port. |
9cf63747 SH |
263 | * if do_all is set also flush static entries |
264 | */ | |
1a620698 SH |
265 | void br_fdb_delete_by_port(struct net_bridge *br, |
266 | const struct net_bridge_port *p, | |
267 | int do_all) | |
1da177e4 LT |
268 | { |
269 | int i; | |
270 | ||
271 | spin_lock_bh(&br->hash_lock); | |
272 | for (i = 0; i < BR_HASH_SIZE; i++) { | |
273 | struct hlist_node *h, *g; | |
9d6f229f | 274 | |
1da177e4 LT |
275 | hlist_for_each_safe(h, g, &br->hash[i]) { |
276 | struct net_bridge_fdb_entry *f | |
277 | = hlist_entry(h, struct net_bridge_fdb_entry, hlist); | |
9d6f229f | 278 | if (f->dst != p) |
1da177e4 LT |
279 | continue; |
280 | ||
1a620698 SH |
281 | if (f->is_static && !do_all) |
282 | continue; | |
1da177e4 | 283 | |
a778e6d1 TM |
284 | if (f->is_local) |
285 | fdb_delete_local(br, p, f); | |
286 | else | |
287 | fdb_delete(br, f); | |
1da177e4 LT |
288 | } |
289 | } | |
290 | spin_unlock_bh(&br->hash_lock); | |
291 | } | |
292 | ||
eeaf61d8 | 293 | /* No locking or refcounting, assumes caller has rcu_read_lock */ |
1da177e4 | 294 | struct net_bridge_fdb_entry *__br_fdb_get(struct net_bridge *br, |
2ba071ec VY |
295 | const unsigned char *addr, |
296 | __u16 vid) | |
1da177e4 | 297 | { |
1da177e4 LT |
298 | struct net_bridge_fdb_entry *fdb; |
299 | ||
b67bfe0d | 300 | hlist_for_each_entry_rcu(fdb, |
2ba071ec VY |
301 | &br->hash[br_mac_hash(addr, vid)], hlist) { |
302 | if (ether_addr_equal(fdb->addr.addr, addr) && | |
303 | fdb->vlan_id == vid) { | |
1da177e4 LT |
304 | if (unlikely(has_expired(br, fdb))) |
305 | break; | |
306 | return fdb; | |
307 | } | |
308 | } | |
309 | ||
310 | return NULL; | |
311 | } | |
312 | ||
e6373c4c | 313 | #if IS_ENABLED(CONFIG_ATM_LANE) |
da678292 MM |
314 | /* Interface used by ATM LANE hook to test |
315 | * if an addr is on some other bridge port */ | |
316 | int br_fdb_test_addr(struct net_device *dev, unsigned char *addr) | |
1da177e4 LT |
317 | { |
318 | struct net_bridge_fdb_entry *fdb; | |
b5ed54e9 | 319 | struct net_bridge_port *port; |
da678292 MM |
320 | int ret; |
321 | ||
1da177e4 | 322 | rcu_read_lock(); |
b5ed54e9 | 323 | port = br_port_get_rcu(dev); |
324 | if (!port) | |
325 | ret = 0; | |
326 | else { | |
2ba071ec | 327 | fdb = __br_fdb_get(port->br, addr, 0); |
43598813 | 328 | ret = fdb && fdb->dst && fdb->dst->dev != dev && |
b5ed54e9 | 329 | fdb->dst->state == BR_STATE_FORWARDING; |
330 | } | |
1da177e4 | 331 | rcu_read_unlock(); |
1da177e4 | 332 | |
da678292 | 333 | return ret; |
1da177e4 | 334 | } |
da678292 | 335 | #endif /* CONFIG_ATM_LANE */ |
1da177e4 LT |
336 | |
337 | /* | |
9d6f229f | 338 | * Fill buffer with forwarding table records in |
1da177e4 LT |
339 | * the API format. |
340 | */ | |
341 | int br_fdb_fillbuf(struct net_bridge *br, void *buf, | |
342 | unsigned long maxnum, unsigned long skip) | |
343 | { | |
344 | struct __fdb_entry *fe = buf; | |
345 | int i, num = 0; | |
1da177e4 LT |
346 | struct net_bridge_fdb_entry *f; |
347 | ||
348 | memset(buf, 0, maxnum*sizeof(struct __fdb_entry)); | |
349 | ||
350 | rcu_read_lock(); | |
351 | for (i = 0; i < BR_HASH_SIZE; i++) { | |
b67bfe0d | 352 | hlist_for_each_entry_rcu(f, &br->hash[i], hlist) { |
1da177e4 LT |
353 | if (num >= maxnum) |
354 | goto out; | |
355 | ||
9d6f229f | 356 | if (has_expired(br, f)) |
1da177e4 LT |
357 | continue; |
358 | ||
43598813 | 359 | /* ignore pseudo entry for local MAC address */ |
360 | if (!f->dst) | |
361 | continue; | |
362 | ||
1da177e4 LT |
363 | if (skip) { |
364 | --skip; | |
365 | continue; | |
366 | } | |
367 | ||
368 | /* convert from internal format to API */ | |
369 | memcpy(fe->mac_addr, f->addr.addr, ETH_ALEN); | |
ae4f8fca SH |
370 | |
371 | /* due to ABI compat need to split into hi/lo */ | |
1da177e4 | 372 | fe->port_no = f->dst->port_no; |
ae4f8fca SH |
373 | fe->port_hi = f->dst->port_no >> 8; |
374 | ||
1da177e4 LT |
375 | fe->is_local = f->is_local; |
376 | if (!f->is_static) | |
a399a805 | 377 | fe->ageing_timer_value = jiffies_delta_to_clock_t(jiffies - f->updated); |
1da177e4 LT |
378 | ++fe; |
379 | ++num; | |
380 | } | |
381 | } | |
382 | ||
383 | out: | |
384 | rcu_read_unlock(); | |
385 | ||
386 | return num; | |
387 | } | |
388 | ||
664de48b | 389 | static struct net_bridge_fdb_entry *fdb_find(struct hlist_head *head, |
2ba071ec VY |
390 | const unsigned char *addr, |
391 | __u16 vid) | |
664de48b | 392 | { |
664de48b | 393 | struct net_bridge_fdb_entry *fdb; |
394 | ||
b67bfe0d | 395 | hlist_for_each_entry(fdb, head, hlist) { |
2ba071ec VY |
396 | if (ether_addr_equal(fdb->addr.addr, addr) && |
397 | fdb->vlan_id == vid) | |
664de48b | 398 | return fdb; |
399 | } | |
400 | return NULL; | |
401 | } | |
402 | ||
403 | static struct net_bridge_fdb_entry *fdb_find_rcu(struct hlist_head *head, | |
2ba071ec VY |
404 | const unsigned char *addr, |
405 | __u16 vid) | |
1da177e4 | 406 | { |
1da177e4 LT |
407 | struct net_bridge_fdb_entry *fdb; |
408 | ||
b67bfe0d | 409 | hlist_for_each_entry_rcu(fdb, head, hlist) { |
2ba071ec VY |
410 | if (ether_addr_equal(fdb->addr.addr, addr) && |
411 | fdb->vlan_id == vid) | |
1da177e4 LT |
412 | return fdb; |
413 | } | |
414 | return NULL; | |
415 | } | |
416 | ||
417 | static struct net_bridge_fdb_entry *fdb_create(struct hlist_head *head, | |
418 | struct net_bridge_port *source, | |
2ba071ec VY |
419 | const unsigned char *addr, |
420 | __u16 vid) | |
1da177e4 LT |
421 | { |
422 | struct net_bridge_fdb_entry *fdb; | |
423 | ||
424 | fdb = kmem_cache_alloc(br_fdb_cache, GFP_ATOMIC); | |
425 | if (fdb) { | |
426 | memcpy(fdb->addr.addr, addr, ETH_ALEN); | |
1da177e4 | 427 | fdb->dst = source; |
2ba071ec | 428 | fdb->vlan_id = vid; |
03e9b64b | 429 | fdb->is_local = 0; |
430 | fdb->is_static = 0; | |
a5642ab4 | 431 | fdb->added_by_user = 0; |
7cd8861a | 432 | fdb->updated = fdb->used = jiffies; |
1158f762 | 433 | hlist_add_head_rcu(&fdb->hlist, head); |
1da177e4 LT |
434 | } |
435 | return fdb; | |
436 | } | |
437 | ||
438 | static int fdb_insert(struct net_bridge *br, struct net_bridge_port *source, | |
bc9a25d2 | 439 | const unsigned char *addr, u16 vid) |
1da177e4 | 440 | { |
bc9a25d2 | 441 | struct hlist_head *head = &br->hash[br_mac_hash(addr, vid)]; |
1da177e4 LT |
442 | struct net_bridge_fdb_entry *fdb; |
443 | ||
444 | if (!is_valid_ether_addr(addr)) | |
445 | return -EINVAL; | |
446 | ||
bc9a25d2 | 447 | fdb = fdb_find(head, addr, vid); |
1da177e4 | 448 | if (fdb) { |
9d6f229f | 449 | /* it is okay to have multiple ports with same |
1da177e4 LT |
450 | * address, just use the first one. |
451 | */ | |
9d6f229f | 452 | if (fdb->is_local) |
1da177e4 | 453 | return 0; |
28a16c97 | 454 | br_warn(br, "adding interface %s with same address " |
1da177e4 | 455 | "as a received packet\n", |
9b46922e | 456 | source ? source->dev->name : br->dev->name); |
31e8a49c | 457 | fdb_delete(br, fdb); |
9d6f229f | 458 | } |
1da177e4 | 459 | |
bc9a25d2 | 460 | fdb = fdb_create(head, source, addr, vid); |
03e9b64b | 461 | if (!fdb) |
1da177e4 LT |
462 | return -ENOMEM; |
463 | ||
03e9b64b | 464 | fdb->is_local = fdb->is_static = 1; |
31e8a49c | 465 | fdb_notify(br, fdb, RTM_NEWNEIGH); |
1da177e4 LT |
466 | return 0; |
467 | } | |
468 | ||
03e9b64b | 469 | /* Add entry for local address of interface */ |
1da177e4 | 470 | int br_fdb_insert(struct net_bridge *br, struct net_bridge_port *source, |
bc9a25d2 | 471 | const unsigned char *addr, u16 vid) |
1da177e4 LT |
472 | { |
473 | int ret; | |
474 | ||
475 | spin_lock_bh(&br->hash_lock); | |
bc9a25d2 | 476 | ret = fdb_insert(br, source, addr, vid); |
1da177e4 LT |
477 | spin_unlock_bh(&br->hash_lock); |
478 | return ret; | |
479 | } | |
480 | ||
481 | void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source, | |
a5642ab4 | 482 | const unsigned char *addr, u16 vid, bool added_by_user) |
1da177e4 | 483 | { |
2ba071ec | 484 | struct hlist_head *head = &br->hash[br_mac_hash(addr, vid)]; |
1da177e4 LT |
485 | struct net_bridge_fdb_entry *fdb; |
486 | ||
487 | /* some users want to always flood. */ | |
488 | if (hold_time(br) == 0) | |
489 | return; | |
490 | ||
df1c0b84 SH |
491 | /* ignore packets unless we are using this port */ |
492 | if (!(source->state == BR_STATE_LEARNING || | |
493 | source->state == BR_STATE_FORWARDING)) | |
494 | return; | |
495 | ||
2ba071ec | 496 | fdb = fdb_find_rcu(head, addr, vid); |
1da177e4 LT |
497 | if (likely(fdb)) { |
498 | /* attempt to update an entry for a local interface */ | |
499 | if (unlikely(fdb->is_local)) { | |
9d6f229f | 500 | if (net_ratelimit()) |
28a16c97 | 501 | br_warn(br, "received packet on %s with " |
502 | "own address as source address\n", | |
503 | source->dev->name); | |
1da177e4 LT |
504 | } else { |
505 | /* fastpath: update of existing entry */ | |
506 | fdb->dst = source; | |
7cd8861a | 507 | fdb->updated = jiffies; |
a5642ab4 TM |
508 | if (unlikely(added_by_user)) |
509 | fdb->added_by_user = 1; | |
1da177e4 LT |
510 | } |
511 | } else { | |
f8ae737d | 512 | spin_lock(&br->hash_lock); |
2ba071ec VY |
513 | if (likely(!fdb_find(head, addr, vid))) { |
514 | fdb = fdb_create(head, source, addr, vid); | |
a5642ab4 TM |
515 | if (fdb) { |
516 | if (unlikely(added_by_user)) | |
517 | fdb->added_by_user = 1; | |
31e8a49c | 518 | fdb_notify(br, fdb, RTM_NEWNEIGH); |
a5642ab4 | 519 | } |
f58ee4e1 | 520 | } |
1da177e4 LT |
521 | /* else we lose race and someone else inserts |
522 | * it first, don't bother updating | |
523 | */ | |
f8ae737d | 524 | spin_unlock(&br->hash_lock); |
1da177e4 | 525 | } |
1da177e4 | 526 | } |
b078f0df | 527 | |
528 | static int fdb_to_nud(const struct net_bridge_fdb_entry *fdb) | |
529 | { | |
530 | if (fdb->is_local) | |
531 | return NUD_PERMANENT; | |
532 | else if (fdb->is_static) | |
533 | return NUD_NOARP; | |
534 | else if (has_expired(fdb->dst->br, fdb)) | |
535 | return NUD_STALE; | |
536 | else | |
537 | return NUD_REACHABLE; | |
538 | } | |
539 | ||
31e8a49c | 540 | static int fdb_fill_info(struct sk_buff *skb, const struct net_bridge *br, |
b078f0df | 541 | const struct net_bridge_fdb_entry *fdb, |
15e47304 | 542 | u32 portid, u32 seq, int type, unsigned int flags) |
b078f0df | 543 | { |
544 | unsigned long now = jiffies; | |
545 | struct nda_cacheinfo ci; | |
546 | struct nlmsghdr *nlh; | |
547 | struct ndmsg *ndm; | |
548 | ||
15e47304 | 549 | nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags); |
b078f0df | 550 | if (nlh == NULL) |
551 | return -EMSGSIZE; | |
552 | ||
b078f0df | 553 | ndm = nlmsg_data(nlh); |
554 | ndm->ndm_family = AF_BRIDGE; | |
555 | ndm->ndm_pad1 = 0; | |
556 | ndm->ndm_pad2 = 0; | |
557 | ndm->ndm_flags = 0; | |
558 | ndm->ndm_type = 0; | |
43598813 | 559 | ndm->ndm_ifindex = fdb->dst ? fdb->dst->dev->ifindex : br->dev->ifindex; |
b078f0df | 560 | ndm->ndm_state = fdb_to_nud(fdb); |
561 | ||
2eb812e6 DM |
562 | if (nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->addr)) |
563 | goto nla_put_failure; | |
b078f0df | 564 | ci.ndm_used = jiffies_to_clock_t(now - fdb->used); |
565 | ci.ndm_confirmed = 0; | |
566 | ci.ndm_updated = jiffies_to_clock_t(now - fdb->updated); | |
567 | ci.ndm_refcnt = 0; | |
2eb812e6 DM |
568 | if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci)) |
569 | goto nla_put_failure; | |
1690be63 VY |
570 | |
571 | if (nla_put(skb, NDA_VLAN, sizeof(u16), &fdb->vlan_id)) | |
572 | goto nla_put_failure; | |
573 | ||
b078f0df | 574 | return nlmsg_end(skb, nlh); |
575 | ||
576 | nla_put_failure: | |
577 | nlmsg_cancel(skb, nlh); | |
578 | return -EMSGSIZE; | |
579 | } | |
580 | ||
581 | static inline size_t fdb_nlmsg_size(void) | |
582 | { | |
583 | return NLMSG_ALIGN(sizeof(struct ndmsg)) | |
584 | + nla_total_size(ETH_ALEN) /* NDA_LLADDR */ | |
1690be63 | 585 | + nla_total_size(sizeof(u16)) /* NDA_VLAN */ |
b078f0df | 586 | + nla_total_size(sizeof(struct nda_cacheinfo)); |
587 | } | |
588 | ||
31e8a49c | 589 | static void fdb_notify(struct net_bridge *br, |
590 | const struct net_bridge_fdb_entry *fdb, int type) | |
b078f0df | 591 | { |
31e8a49c | 592 | struct net *net = dev_net(br->dev); |
b078f0df | 593 | struct sk_buff *skb; |
594 | int err = -ENOBUFS; | |
595 | ||
596 | skb = nlmsg_new(fdb_nlmsg_size(), GFP_ATOMIC); | |
597 | if (skb == NULL) | |
598 | goto errout; | |
599 | ||
31e8a49c | 600 | err = fdb_fill_info(skb, br, fdb, 0, 0, type, 0); |
b078f0df | 601 | if (err < 0) { |
602 | /* -EMSGSIZE implies BUG in fdb_nlmsg_size() */ | |
603 | WARN_ON(err == -EMSGSIZE); | |
604 | kfree_skb(skb); | |
605 | goto errout; | |
606 | } | |
607 | rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC); | |
608 | return; | |
609 | errout: | |
87e823b3 | 610 | rtnl_set_sk_err(net, RTNLGRP_NEIGH, err); |
b078f0df | 611 | } |
612 | ||
613 | /* Dump information about entries, in response to GETNEIGH */ | |
77162022 JF |
614 | int br_fdb_dump(struct sk_buff *skb, |
615 | struct netlink_callback *cb, | |
616 | struct net_device *dev, | |
617 | int idx) | |
b078f0df | 618 | { |
77162022 JF |
619 | struct net_bridge *br = netdev_priv(dev); |
620 | int i; | |
b078f0df | 621 | |
77162022 JF |
622 | if (!(dev->priv_flags & IFF_EBRIDGE)) |
623 | goto out; | |
b078f0df | 624 | |
77162022 | 625 | for (i = 0; i < BR_HASH_SIZE; i++) { |
77162022 | 626 | struct net_bridge_fdb_entry *f; |
b078f0df | 627 | |
b67bfe0d | 628 | hlist_for_each_entry_rcu(f, &br->hash[i], hlist) { |
77162022 JF |
629 | if (idx < cb->args[0]) |
630 | goto skip; | |
631 | ||
632 | if (fdb_fill_info(skb, br, f, | |
15e47304 | 633 | NETLINK_CB(cb->skb).portid, |
77162022 JF |
634 | cb->nlh->nlmsg_seq, |
635 | RTM_NEWNEIGH, | |
636 | NLM_F_MULTI) < 0) | |
637 | break; | |
b078f0df | 638 | skip: |
77162022 | 639 | ++idx; |
b078f0df | 640 | } |
641 | } | |
b078f0df | 642 | |
77162022 JF |
643 | out: |
644 | return idx; | |
b078f0df | 645 | } |
36fd2b63 | 646 | |
292d1398 | 647 | /* Update (create or replace) forwarding database entry */ |
36fd2b63 | 648 | static int fdb_add_entry(struct net_bridge_port *source, const __u8 *addr, |
2ba071ec | 649 | __u16 state, __u16 flags, __u16 vid) |
36fd2b63 | 650 | { |
651 | struct net_bridge *br = source->br; | |
2ba071ec | 652 | struct hlist_head *head = &br->hash[br_mac_hash(addr, vid)]; |
36fd2b63 | 653 | struct net_bridge_fdb_entry *fdb; |
b0a397fb | 654 | bool modified = false; |
36fd2b63 | 655 | |
2ba071ec | 656 | fdb = fdb_find(head, addr, vid); |
64af1bac | 657 | if (fdb == NULL) { |
658 | if (!(flags & NLM_F_CREATE)) | |
659 | return -ENOENT; | |
36fd2b63 | 660 | |
2ba071ec | 661 | fdb = fdb_create(head, source, addr, vid); |
64af1bac | 662 | if (!fdb) |
663 | return -ENOMEM; | |
b0a397fb | 664 | |
665 | modified = true; | |
64af1bac | 666 | } else { |
667 | if (flags & NLM_F_EXCL) | |
668 | return -EEXIST; | |
b0a397fb | 669 | |
670 | if (fdb->dst != source) { | |
671 | fdb->dst = source; | |
672 | modified = true; | |
673 | } | |
292d1398 | 674 | } |
675 | ||
676 | if (fdb_to_nud(fdb) != state) { | |
677 | if (state & NUD_PERMANENT) | |
678 | fdb->is_local = fdb->is_static = 1; | |
679 | else if (state & NUD_NOARP) { | |
680 | fdb->is_local = 0; | |
681 | fdb->is_static = 1; | |
682 | } else | |
683 | fdb->is_local = fdb->is_static = 0; | |
64af1bac | 684 | |
b0a397fb | 685 | modified = true; |
686 | } | |
a5642ab4 | 687 | fdb->added_by_user = 1; |
b0a397fb | 688 | |
689 | fdb->used = jiffies; | |
690 | if (modified) { | |
691 | fdb->updated = jiffies; | |
31e8a49c | 692 | fdb_notify(br, fdb, RTM_NEWNEIGH); |
64af1bac | 693 | } |
36fd2b63 | 694 | |
36fd2b63 | 695 | return 0; |
696 | } | |
697 | ||
1690be63 VY |
698 | static int __br_fdb_add(struct ndmsg *ndm, struct net_bridge_port *p, |
699 | const unsigned char *addr, u16 nlh_flags, u16 vid) | |
700 | { | |
701 | int err = 0; | |
702 | ||
703 | if (ndm->ndm_flags & NTF_USE) { | |
704 | rcu_read_lock(); | |
a5642ab4 | 705 | br_fdb_update(p->br, p, addr, vid, true); |
1690be63 VY |
706 | rcu_read_unlock(); |
707 | } else { | |
708 | spin_lock_bh(&p->br->hash_lock); | |
709 | err = fdb_add_entry(p, addr, ndm->ndm_state, | |
710 | nlh_flags, vid); | |
711 | spin_unlock_bh(&p->br->hash_lock); | |
712 | } | |
713 | ||
714 | return err; | |
715 | } | |
716 | ||
36fd2b63 | 717 | /* Add new permanent fdb entry with RTM_NEWNEIGH */ |
edc7d573 | 718 | int br_fdb_add(struct ndmsg *ndm, struct nlattr *tb[], |
719 | struct net_device *dev, | |
6b6e2725 | 720 | const unsigned char *addr, u16 nlh_flags) |
36fd2b63 | 721 | { |
36fd2b63 | 722 | struct net_bridge_port *p; |
77162022 | 723 | int err = 0; |
1690be63 VY |
724 | struct net_port_vlans *pv; |
725 | unsigned short vid = VLAN_N_VID; | |
36fd2b63 | 726 | |
292d1398 | 727 | if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_NOARP|NUD_REACHABLE))) { |
728 | pr_info("bridge: RTM_NEWNEIGH with invalid state %#x\n", ndm->ndm_state); | |
729 | return -EINVAL; | |
730 | } | |
731 | ||
1690be63 VY |
732 | if (tb[NDA_VLAN]) { |
733 | if (nla_len(tb[NDA_VLAN]) != sizeof(unsigned short)) { | |
734 | pr_info("bridge: RTM_NEWNEIGH with invalid vlan\n"); | |
735 | return -EINVAL; | |
736 | } | |
737 | ||
738 | vid = nla_get_u16(tb[NDA_VLAN]); | |
739 | ||
8adff41c | 740 | if (!vid || vid >= VLAN_VID_MASK) { |
1690be63 VY |
741 | pr_info("bridge: RTM_NEWNEIGH with invalid vlan id %d\n", |
742 | vid); | |
743 | return -EINVAL; | |
744 | } | |
745 | } | |
746 | ||
537f7f84 SH |
747 | if (is_zero_ether_addr(addr)) { |
748 | pr_info("bridge: RTM_NEWNEIGH with invalid ether address\n"); | |
749 | return -EINVAL; | |
750 | } | |
751 | ||
36fd2b63 | 752 | p = br_port_get_rtnl(dev); |
753 | if (p == NULL) { | |
754 | pr_info("bridge: RTM_NEWNEIGH %s not a bridge port\n", | |
755 | dev->name); | |
756 | return -EINVAL; | |
757 | } | |
758 | ||
1690be63 VY |
759 | pv = nbp_get_vlan_info(p); |
760 | if (vid != VLAN_N_VID) { | |
761 | if (!pv || !test_bit(vid, pv->vlan_bitmap)) { | |
762 | pr_info("bridge: RTM_NEWNEIGH with unconfigured " | |
763 | "vlan %d on port %s\n", vid, dev->name); | |
764 | return -EINVAL; | |
765 | } | |
766 | ||
767 | /* VID was specified, so use it. */ | |
768 | err = __br_fdb_add(ndm, p, addr, nlh_flags, vid); | |
292d1398 | 769 | } else { |
ef40b7ef | 770 | if (!pv || bitmap_empty(pv->vlan_bitmap, VLAN_N_VID)) { |
1690be63 VY |
771 | err = __br_fdb_add(ndm, p, addr, nlh_flags, 0); |
772 | goto out; | |
773 | } | |
774 | ||
775 | /* We have vlans configured on this port and user didn't | |
776 | * specify a VLAN. To be nice, add/update entry for every | |
777 | * vlan on this port. | |
778 | */ | |
ef40b7ef | 779 | for_each_set_bit(vid, pv->vlan_bitmap, VLAN_N_VID) { |
1690be63 VY |
780 | err = __br_fdb_add(ndm, p, addr, nlh_flags, vid); |
781 | if (err) | |
782 | goto out; | |
1690be63 | 783 | } |
292d1398 | 784 | } |
36fd2b63 | 785 | |
1690be63 | 786 | out: |
36fd2b63 | 787 | return err; |
788 | } | |
789 | ||
424bb9c9 | 790 | static int fdb_delete_by_addr(struct net_bridge *br, const u8 *addr, u16 vlan) |
36fd2b63 | 791 | { |
1690be63 | 792 | struct hlist_head *head = &br->hash[br_mac_hash(addr, vlan)]; |
36fd2b63 | 793 | struct net_bridge_fdb_entry *fdb; |
794 | ||
1690be63 | 795 | fdb = fdb_find(head, addr, vlan); |
36fd2b63 | 796 | if (!fdb) |
797 | return -ENOENT; | |
798 | ||
1690be63 | 799 | fdb_delete(br, fdb); |
36fd2b63 | 800 | return 0; |
801 | } | |
802 | ||
1690be63 VY |
803 | static int __br_fdb_delete(struct net_bridge_port *p, |
804 | const unsigned char *addr, u16 vid) | |
805 | { | |
806 | int err; | |
807 | ||
808 | spin_lock_bh(&p->br->hash_lock); | |
809 | err = fdb_delete_by_addr(p->br, addr, vid); | |
810 | spin_unlock_bh(&p->br->hash_lock); | |
811 | ||
812 | return err; | |
813 | } | |
814 | ||
36fd2b63 | 815 | /* Remove neighbor entry with RTM_DELNEIGH */ |
1690be63 VY |
816 | int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[], |
817 | struct net_device *dev, | |
6b6e2725 | 818 | const unsigned char *addr) |
36fd2b63 | 819 | { |
36fd2b63 | 820 | struct net_bridge_port *p; |
36fd2b63 | 821 | int err; |
1690be63 VY |
822 | struct net_port_vlans *pv; |
823 | unsigned short vid = VLAN_N_VID; | |
36fd2b63 | 824 | |
1690be63 VY |
825 | if (tb[NDA_VLAN]) { |
826 | if (nla_len(tb[NDA_VLAN]) != sizeof(unsigned short)) { | |
827 | pr_info("bridge: RTM_NEWNEIGH with invalid vlan\n"); | |
828 | return -EINVAL; | |
829 | } | |
830 | ||
831 | vid = nla_get_u16(tb[NDA_VLAN]); | |
832 | ||
8adff41c | 833 | if (!vid || vid >= VLAN_VID_MASK) { |
1690be63 VY |
834 | pr_info("bridge: RTM_NEWNEIGH with invalid vlan id %d\n", |
835 | vid); | |
836 | return -EINVAL; | |
837 | } | |
838 | } | |
36fd2b63 | 839 | p = br_port_get_rtnl(dev); |
840 | if (p == NULL) { | |
841 | pr_info("bridge: RTM_DELNEIGH %s not a bridge port\n", | |
842 | dev->name); | |
843 | return -EINVAL; | |
844 | } | |
845 | ||
1690be63 VY |
846 | pv = nbp_get_vlan_info(p); |
847 | if (vid != VLAN_N_VID) { | |
848 | if (!pv || !test_bit(vid, pv->vlan_bitmap)) { | |
849 | pr_info("bridge: RTM_DELNEIGH with unconfigured " | |
850 | "vlan %d on port %s\n", vid, dev->name); | |
851 | return -EINVAL; | |
852 | } | |
36fd2b63 | 853 | |
1690be63 VY |
854 | err = __br_fdb_delete(p, addr, vid); |
855 | } else { | |
ef40b7ef | 856 | if (!pv || bitmap_empty(pv->vlan_bitmap, VLAN_N_VID)) { |
1690be63 VY |
857 | err = __br_fdb_delete(p, addr, 0); |
858 | goto out; | |
859 | } | |
860 | ||
861 | /* We have vlans configured on this port and user didn't | |
862 | * specify a VLAN. To be nice, add/update entry for every | |
863 | * vlan on this port. | |
864 | */ | |
865 | err = -ENOENT; | |
ef40b7ef | 866 | for_each_set_bit(vid, pv->vlan_bitmap, VLAN_N_VID) { |
1690be63 | 867 | err &= __br_fdb_delete(p, addr, vid); |
1690be63 VY |
868 | } |
869 | } | |
870 | out: | |
36fd2b63 | 871 | return err; |
872 | } |