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 | 30 | static int fdb_insert(struct net_bridge *br, struct net_bridge_port *source, |
bc9a25d2 | 31 | const unsigned char *addr, u16 vid); |
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; | |
bc9a25d2 | 95 | bool no_vlan = (nbp_get_vlan_info(p) == NULL) ? true : false; |
1da177e4 | 96 | int i; |
9d6f229f | 97 | |
1da177e4 LT |
98 | spin_lock_bh(&br->hash_lock); |
99 | ||
100 | /* Search all chains since old address/hash is unknown */ | |
101 | for (i = 0; i < BR_HASH_SIZE; i++) { | |
102 | struct hlist_node *h; | |
103 | hlist_for_each(h, &br->hash[i]) { | |
104 | struct net_bridge_fdb_entry *f; | |
105 | ||
106 | f = hlist_entry(h, struct net_bridge_fdb_entry, hlist); | |
107 | if (f->dst == p && f->is_local) { | |
108 | /* maybe another port has same hw addr? */ | |
109 | struct net_bridge_port *op; | |
bc9a25d2 | 110 | u16 vid = f->vlan_id; |
1da177e4 | 111 | list_for_each_entry(op, &br->port_list, list) { |
9d6f229f | 112 | if (op != p && |
9a7b6ef9 | 113 | ether_addr_equal(op->dev->dev_addr, |
bc9a25d2 VY |
114 | f->addr.addr) && |
115 | nbp_vlan_find(op, vid)) { | |
1da177e4 LT |
116 | f->dst = op; |
117 | goto insert; | |
118 | } | |
119 | } | |
120 | ||
121 | /* delete old one */ | |
31e8a49c | 122 | fdb_delete(br, f); |
bc9a25d2 VY |
123 | insert: |
124 | /* insert new address, may fail if invalid | |
125 | * address or dup. | |
126 | */ | |
127 | fdb_insert(br, p, newaddr, vid); | |
128 | ||
129 | /* if this port has no vlan information | |
130 | * configured, we can safely be done at | |
131 | * this point. | |
132 | */ | |
133 | if (no_vlan) | |
134 | goto done; | |
1da177e4 LT |
135 | } |
136 | } | |
137 | } | |
1da177e4 | 138 | |
bc9a25d2 | 139 | done: |
1da177e4 LT |
140 | spin_unlock_bh(&br->hash_lock); |
141 | } | |
142 | ||
43598813 | 143 | void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr) |
144 | { | |
145 | struct net_bridge_fdb_entry *f; | |
bc9a25d2 VY |
146 | struct net_port_vlans *pv; |
147 | u16 vid = 0; | |
43598813 | 148 | |
149 | /* If old entry was unassociated with any port, then delete it. */ | |
2ba071ec | 150 | f = __br_fdb_get(br, br->dev->dev_addr, 0); |
43598813 | 151 | if (f && f->is_local && !f->dst) |
152 | fdb_delete(br, f); | |
153 | ||
bc9a25d2 VY |
154 | fdb_insert(br, NULL, newaddr, 0); |
155 | ||
156 | /* Now remove and add entries for every VLAN configured on the | |
157 | * bridge. This function runs under RTNL so the bitmap will not | |
158 | * change from under us. | |
159 | */ | |
160 | pv = br_get_vlan_info(br); | |
161 | if (!pv) | |
162 | return; | |
163 | ||
164 | for (vid = find_next_bit(pv->vlan_bitmap, BR_VLAN_BITMAP_LEN, vid); | |
165 | vid < BR_VLAN_BITMAP_LEN; | |
166 | vid = find_next_bit(pv->vlan_bitmap, BR_VLAN_BITMAP_LEN, vid+1)) { | |
167 | f = __br_fdb_get(br, br->dev->dev_addr, vid); | |
168 | if (f && f->is_local && !f->dst) | |
169 | fdb_delete(br, f); | |
170 | fdb_insert(br, NULL, newaddr, vid); | |
171 | } | |
43598813 | 172 | } |
173 | ||
1da177e4 LT |
174 | void br_fdb_cleanup(unsigned long _data) |
175 | { | |
176 | struct net_bridge *br = (struct net_bridge *)_data; | |
177 | unsigned long delay = hold_time(br); | |
25442e06 | 178 | unsigned long next_timer = jiffies + br->ageing_time; |
1da177e4 LT |
179 | int i; |
180 | ||
27a42938 | 181 | spin_lock(&br->hash_lock); |
1da177e4 LT |
182 | for (i = 0; i < BR_HASH_SIZE; i++) { |
183 | struct net_bridge_fdb_entry *f; | |
184 | struct hlist_node *h, *n; | |
185 | ||
186 | hlist_for_each_entry_safe(f, h, n, &br->hash[i], hlist) { | |
071f7722 BE |
187 | unsigned long this_timer; |
188 | if (f->is_static) | |
189 | continue; | |
7cd8861a | 190 | this_timer = f->updated + delay; |
071f7722 | 191 | if (time_before_eq(this_timer, jiffies)) |
31e8a49c | 192 | fdb_delete(br, f); |
2bec008c | 193 | else if (time_before(this_timer, next_timer)) |
071f7722 | 194 | next_timer = this_timer; |
1da177e4 LT |
195 | } |
196 | } | |
27a42938 | 197 | spin_unlock(&br->hash_lock); |
1da177e4 | 198 | |
25442e06 | 199 | mod_timer(&br->gc_timer, round_jiffies_up(next_timer)); |
1da177e4 LT |
200 | } |
201 | ||
9cf63747 SH |
202 | /* Completely flush all dynamic entries in forwarding database.*/ |
203 | void br_fdb_flush(struct net_bridge *br) | |
204 | { | |
205 | int i; | |
206 | ||
207 | spin_lock_bh(&br->hash_lock); | |
208 | for (i = 0; i < BR_HASH_SIZE; i++) { | |
209 | struct net_bridge_fdb_entry *f; | |
210 | struct hlist_node *h, *n; | |
211 | hlist_for_each_entry_safe(f, h, n, &br->hash[i], hlist) { | |
212 | if (!f->is_static) | |
31e8a49c | 213 | fdb_delete(br, f); |
9cf63747 SH |
214 | } |
215 | } | |
216 | spin_unlock_bh(&br->hash_lock); | |
217 | } | |
1a620698 | 218 | |
25985edc | 219 | /* Flush all entries referring to a specific port. |
9cf63747 SH |
220 | * if do_all is set also flush static entries |
221 | */ | |
1a620698 SH |
222 | void br_fdb_delete_by_port(struct net_bridge *br, |
223 | const struct net_bridge_port *p, | |
224 | int do_all) | |
1da177e4 LT |
225 | { |
226 | int i; | |
227 | ||
228 | spin_lock_bh(&br->hash_lock); | |
229 | for (i = 0; i < BR_HASH_SIZE; i++) { | |
230 | struct hlist_node *h, *g; | |
9d6f229f | 231 | |
1da177e4 LT |
232 | hlist_for_each_safe(h, g, &br->hash[i]) { |
233 | struct net_bridge_fdb_entry *f | |
234 | = hlist_entry(h, struct net_bridge_fdb_entry, hlist); | |
9d6f229f | 235 | if (f->dst != p) |
1da177e4 LT |
236 | continue; |
237 | ||
1a620698 SH |
238 | if (f->is_static && !do_all) |
239 | continue; | |
1da177e4 LT |
240 | /* |
241 | * if multiple ports all have the same device address | |
242 | * then when one port is deleted, assign | |
243 | * the local entry to other port | |
244 | */ | |
245 | if (f->is_local) { | |
246 | struct net_bridge_port *op; | |
247 | list_for_each_entry(op, &br->port_list, list) { | |
9d6f229f | 248 | if (op != p && |
9a7b6ef9 JP |
249 | ether_addr_equal(op->dev->dev_addr, |
250 | f->addr.addr)) { | |
1da177e4 LT |
251 | f->dst = op; |
252 | goto skip_delete; | |
253 | } | |
254 | } | |
255 | } | |
256 | ||
31e8a49c | 257 | fdb_delete(br, f); |
1da177e4 LT |
258 | skip_delete: ; |
259 | } | |
260 | } | |
261 | spin_unlock_bh(&br->hash_lock); | |
262 | } | |
263 | ||
eeaf61d8 | 264 | /* No locking or refcounting, assumes caller has rcu_read_lock */ |
1da177e4 | 265 | struct net_bridge_fdb_entry *__br_fdb_get(struct net_bridge *br, |
2ba071ec VY |
266 | const unsigned char *addr, |
267 | __u16 vid) | |
1da177e4 LT |
268 | { |
269 | struct hlist_node *h; | |
270 | struct net_bridge_fdb_entry *fdb; | |
271 | ||
2ba071ec VY |
272 | hlist_for_each_entry_rcu(fdb, h, |
273 | &br->hash[br_mac_hash(addr, vid)], hlist) { | |
274 | if (ether_addr_equal(fdb->addr.addr, addr) && | |
275 | fdb->vlan_id == vid) { | |
1da177e4 LT |
276 | if (unlikely(has_expired(br, fdb))) |
277 | break; | |
278 | return fdb; | |
279 | } | |
280 | } | |
281 | ||
282 | return NULL; | |
283 | } | |
284 | ||
e6373c4c | 285 | #if IS_ENABLED(CONFIG_ATM_LANE) |
da678292 MM |
286 | /* Interface used by ATM LANE hook to test |
287 | * if an addr is on some other bridge port */ | |
288 | int br_fdb_test_addr(struct net_device *dev, unsigned char *addr) | |
1da177e4 LT |
289 | { |
290 | struct net_bridge_fdb_entry *fdb; | |
b5ed54e9 | 291 | struct net_bridge_port *port; |
da678292 MM |
292 | int ret; |
293 | ||
1da177e4 | 294 | rcu_read_lock(); |
b5ed54e9 | 295 | port = br_port_get_rcu(dev); |
296 | if (!port) | |
297 | ret = 0; | |
298 | else { | |
2ba071ec | 299 | fdb = __br_fdb_get(port->br, addr, 0); |
43598813 | 300 | ret = fdb && fdb->dst && fdb->dst->dev != dev && |
b5ed54e9 | 301 | fdb->dst->state == BR_STATE_FORWARDING; |
302 | } | |
1da177e4 | 303 | rcu_read_unlock(); |
1da177e4 | 304 | |
da678292 | 305 | return ret; |
1da177e4 | 306 | } |
da678292 | 307 | #endif /* CONFIG_ATM_LANE */ |
1da177e4 LT |
308 | |
309 | /* | |
9d6f229f | 310 | * Fill buffer with forwarding table records in |
1da177e4 LT |
311 | * the API format. |
312 | */ | |
313 | int br_fdb_fillbuf(struct net_bridge *br, void *buf, | |
314 | unsigned long maxnum, unsigned long skip) | |
315 | { | |
316 | struct __fdb_entry *fe = buf; | |
317 | int i, num = 0; | |
318 | struct hlist_node *h; | |
319 | struct net_bridge_fdb_entry *f; | |
320 | ||
321 | memset(buf, 0, maxnum*sizeof(struct __fdb_entry)); | |
322 | ||
323 | rcu_read_lock(); | |
324 | for (i = 0; i < BR_HASH_SIZE; i++) { | |
325 | hlist_for_each_entry_rcu(f, h, &br->hash[i], hlist) { | |
326 | if (num >= maxnum) | |
327 | goto out; | |
328 | ||
9d6f229f | 329 | if (has_expired(br, f)) |
1da177e4 LT |
330 | continue; |
331 | ||
43598813 | 332 | /* ignore pseudo entry for local MAC address */ |
333 | if (!f->dst) | |
334 | continue; | |
335 | ||
1da177e4 LT |
336 | if (skip) { |
337 | --skip; | |
338 | continue; | |
339 | } | |
340 | ||
341 | /* convert from internal format to API */ | |
342 | memcpy(fe->mac_addr, f->addr.addr, ETH_ALEN); | |
ae4f8fca SH |
343 | |
344 | /* due to ABI compat need to split into hi/lo */ | |
1da177e4 | 345 | fe->port_no = f->dst->port_no; |
ae4f8fca SH |
346 | fe->port_hi = f->dst->port_no >> 8; |
347 | ||
1da177e4 LT |
348 | fe->is_local = f->is_local; |
349 | if (!f->is_static) | |
a399a805 | 350 | fe->ageing_timer_value = jiffies_delta_to_clock_t(jiffies - f->updated); |
1da177e4 LT |
351 | ++fe; |
352 | ++num; | |
353 | } | |
354 | } | |
355 | ||
356 | out: | |
357 | rcu_read_unlock(); | |
358 | ||
359 | return num; | |
360 | } | |
361 | ||
664de48b | 362 | static struct net_bridge_fdb_entry *fdb_find(struct hlist_head *head, |
2ba071ec VY |
363 | const unsigned char *addr, |
364 | __u16 vid) | |
664de48b | 365 | { |
366 | struct hlist_node *h; | |
367 | struct net_bridge_fdb_entry *fdb; | |
368 | ||
369 | hlist_for_each_entry(fdb, h, head, hlist) { | |
2ba071ec VY |
370 | if (ether_addr_equal(fdb->addr.addr, addr) && |
371 | fdb->vlan_id == vid) | |
664de48b | 372 | return fdb; |
373 | } | |
374 | return NULL; | |
375 | } | |
376 | ||
377 | static struct net_bridge_fdb_entry *fdb_find_rcu(struct hlist_head *head, | |
2ba071ec VY |
378 | const unsigned char *addr, |
379 | __u16 vid) | |
1da177e4 LT |
380 | { |
381 | struct hlist_node *h; | |
382 | struct net_bridge_fdb_entry *fdb; | |
383 | ||
384 | hlist_for_each_entry_rcu(fdb, h, head, hlist) { | |
2ba071ec VY |
385 | if (ether_addr_equal(fdb->addr.addr, addr) && |
386 | fdb->vlan_id == vid) | |
1da177e4 LT |
387 | return fdb; |
388 | } | |
389 | return NULL; | |
390 | } | |
391 | ||
392 | static struct net_bridge_fdb_entry *fdb_create(struct hlist_head *head, | |
393 | struct net_bridge_port *source, | |
2ba071ec VY |
394 | const unsigned char *addr, |
395 | __u16 vid) | |
1da177e4 LT |
396 | { |
397 | struct net_bridge_fdb_entry *fdb; | |
398 | ||
399 | fdb = kmem_cache_alloc(br_fdb_cache, GFP_ATOMIC); | |
400 | if (fdb) { | |
401 | memcpy(fdb->addr.addr, addr, ETH_ALEN); | |
1da177e4 | 402 | fdb->dst = source; |
2ba071ec | 403 | fdb->vlan_id = vid; |
03e9b64b | 404 | fdb->is_local = 0; |
405 | fdb->is_static = 0; | |
7cd8861a | 406 | fdb->updated = fdb->used = jiffies; |
1158f762 | 407 | hlist_add_head_rcu(&fdb->hlist, head); |
1da177e4 LT |
408 | } |
409 | return fdb; | |
410 | } | |
411 | ||
412 | static int fdb_insert(struct net_bridge *br, struct net_bridge_port *source, | |
bc9a25d2 | 413 | const unsigned char *addr, u16 vid) |
1da177e4 | 414 | { |
bc9a25d2 | 415 | struct hlist_head *head = &br->hash[br_mac_hash(addr, vid)]; |
1da177e4 LT |
416 | struct net_bridge_fdb_entry *fdb; |
417 | ||
418 | if (!is_valid_ether_addr(addr)) | |
419 | return -EINVAL; | |
420 | ||
bc9a25d2 | 421 | fdb = fdb_find(head, addr, vid); |
1da177e4 | 422 | if (fdb) { |
9d6f229f | 423 | /* it is okay to have multiple ports with same |
1da177e4 LT |
424 | * address, just use the first one. |
425 | */ | |
9d6f229f | 426 | if (fdb->is_local) |
1da177e4 | 427 | return 0; |
28a16c97 | 428 | br_warn(br, "adding interface %s with same address " |
1da177e4 LT |
429 | "as a received packet\n", |
430 | source->dev->name); | |
31e8a49c | 431 | fdb_delete(br, fdb); |
9d6f229f | 432 | } |
1da177e4 | 433 | |
bc9a25d2 | 434 | fdb = fdb_create(head, source, addr, vid); |
03e9b64b | 435 | if (!fdb) |
1da177e4 LT |
436 | return -ENOMEM; |
437 | ||
03e9b64b | 438 | fdb->is_local = fdb->is_static = 1; |
31e8a49c | 439 | fdb_notify(br, fdb, RTM_NEWNEIGH); |
1da177e4 LT |
440 | return 0; |
441 | } | |
442 | ||
03e9b64b | 443 | /* Add entry for local address of interface */ |
1da177e4 | 444 | int br_fdb_insert(struct net_bridge *br, struct net_bridge_port *source, |
bc9a25d2 | 445 | const unsigned char *addr, u16 vid) |
1da177e4 LT |
446 | { |
447 | int ret; | |
448 | ||
449 | spin_lock_bh(&br->hash_lock); | |
bc9a25d2 | 450 | ret = fdb_insert(br, source, addr, vid); |
1da177e4 LT |
451 | spin_unlock_bh(&br->hash_lock); |
452 | return ret; | |
453 | } | |
454 | ||
455 | void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source, | |
2ba071ec | 456 | const unsigned char *addr, u16 vid) |
1da177e4 | 457 | { |
2ba071ec | 458 | struct hlist_head *head = &br->hash[br_mac_hash(addr, vid)]; |
1da177e4 LT |
459 | struct net_bridge_fdb_entry *fdb; |
460 | ||
461 | /* some users want to always flood. */ | |
462 | if (hold_time(br) == 0) | |
463 | return; | |
464 | ||
df1c0b84 SH |
465 | /* ignore packets unless we are using this port */ |
466 | if (!(source->state == BR_STATE_LEARNING || | |
467 | source->state == BR_STATE_FORWARDING)) | |
468 | return; | |
469 | ||
2ba071ec | 470 | fdb = fdb_find_rcu(head, addr, vid); |
1da177e4 LT |
471 | if (likely(fdb)) { |
472 | /* attempt to update an entry for a local interface */ | |
473 | if (unlikely(fdb->is_local)) { | |
9d6f229f | 474 | if (net_ratelimit()) |
28a16c97 | 475 | br_warn(br, "received packet on %s with " |
476 | "own address as source address\n", | |
477 | source->dev->name); | |
1da177e4 LT |
478 | } else { |
479 | /* fastpath: update of existing entry */ | |
480 | fdb->dst = source; | |
7cd8861a | 481 | fdb->updated = jiffies; |
1da177e4 LT |
482 | } |
483 | } else { | |
f8ae737d | 484 | spin_lock(&br->hash_lock); |
2ba071ec VY |
485 | if (likely(!fdb_find(head, addr, vid))) { |
486 | fdb = fdb_create(head, source, addr, vid); | |
f58ee4e1 | 487 | if (fdb) |
31e8a49c | 488 | fdb_notify(br, fdb, RTM_NEWNEIGH); |
f58ee4e1 | 489 | } |
1da177e4 LT |
490 | /* else we lose race and someone else inserts |
491 | * it first, don't bother updating | |
492 | */ | |
f8ae737d | 493 | spin_unlock(&br->hash_lock); |
1da177e4 | 494 | } |
1da177e4 | 495 | } |
b078f0df | 496 | |
497 | static int fdb_to_nud(const struct net_bridge_fdb_entry *fdb) | |
498 | { | |
499 | if (fdb->is_local) | |
500 | return NUD_PERMANENT; | |
501 | else if (fdb->is_static) | |
502 | return NUD_NOARP; | |
503 | else if (has_expired(fdb->dst->br, fdb)) | |
504 | return NUD_STALE; | |
505 | else | |
506 | return NUD_REACHABLE; | |
507 | } | |
508 | ||
31e8a49c | 509 | static int fdb_fill_info(struct sk_buff *skb, const struct net_bridge *br, |
b078f0df | 510 | const struct net_bridge_fdb_entry *fdb, |
15e47304 | 511 | u32 portid, u32 seq, int type, unsigned int flags) |
b078f0df | 512 | { |
513 | unsigned long now = jiffies; | |
514 | struct nda_cacheinfo ci; | |
515 | struct nlmsghdr *nlh; | |
516 | struct ndmsg *ndm; | |
517 | ||
15e47304 | 518 | nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags); |
b078f0df | 519 | if (nlh == NULL) |
520 | return -EMSGSIZE; | |
521 | ||
b078f0df | 522 | ndm = nlmsg_data(nlh); |
523 | ndm->ndm_family = AF_BRIDGE; | |
524 | ndm->ndm_pad1 = 0; | |
525 | ndm->ndm_pad2 = 0; | |
526 | ndm->ndm_flags = 0; | |
527 | ndm->ndm_type = 0; | |
43598813 | 528 | ndm->ndm_ifindex = fdb->dst ? fdb->dst->dev->ifindex : br->dev->ifindex; |
b078f0df | 529 | ndm->ndm_state = fdb_to_nud(fdb); |
530 | ||
2eb812e6 DM |
531 | if (nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->addr)) |
532 | goto nla_put_failure; | |
b078f0df | 533 | ci.ndm_used = jiffies_to_clock_t(now - fdb->used); |
534 | ci.ndm_confirmed = 0; | |
535 | ci.ndm_updated = jiffies_to_clock_t(now - fdb->updated); | |
536 | ci.ndm_refcnt = 0; | |
2eb812e6 DM |
537 | if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci)) |
538 | goto nla_put_failure; | |
1690be63 VY |
539 | |
540 | if (nla_put(skb, NDA_VLAN, sizeof(u16), &fdb->vlan_id)) | |
541 | goto nla_put_failure; | |
542 | ||
b078f0df | 543 | return nlmsg_end(skb, nlh); |
544 | ||
545 | nla_put_failure: | |
546 | nlmsg_cancel(skb, nlh); | |
547 | return -EMSGSIZE; | |
548 | } | |
549 | ||
550 | static inline size_t fdb_nlmsg_size(void) | |
551 | { | |
552 | return NLMSG_ALIGN(sizeof(struct ndmsg)) | |
553 | + nla_total_size(ETH_ALEN) /* NDA_LLADDR */ | |
1690be63 | 554 | + nla_total_size(sizeof(u16)) /* NDA_VLAN */ |
b078f0df | 555 | + nla_total_size(sizeof(struct nda_cacheinfo)); |
556 | } | |
557 | ||
31e8a49c | 558 | static void fdb_notify(struct net_bridge *br, |
559 | const struct net_bridge_fdb_entry *fdb, int type) | |
b078f0df | 560 | { |
31e8a49c | 561 | struct net *net = dev_net(br->dev); |
b078f0df | 562 | struct sk_buff *skb; |
563 | int err = -ENOBUFS; | |
564 | ||
565 | skb = nlmsg_new(fdb_nlmsg_size(), GFP_ATOMIC); | |
566 | if (skb == NULL) | |
567 | goto errout; | |
568 | ||
31e8a49c | 569 | err = fdb_fill_info(skb, br, fdb, 0, 0, type, 0); |
b078f0df | 570 | if (err < 0) { |
571 | /* -EMSGSIZE implies BUG in fdb_nlmsg_size() */ | |
572 | WARN_ON(err == -EMSGSIZE); | |
573 | kfree_skb(skb); | |
574 | goto errout; | |
575 | } | |
576 | rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC); | |
577 | return; | |
578 | errout: | |
579 | if (err < 0) | |
580 | rtnl_set_sk_err(net, RTNLGRP_NEIGH, err); | |
581 | } | |
582 | ||
583 | /* Dump information about entries, in response to GETNEIGH */ | |
77162022 JF |
584 | int br_fdb_dump(struct sk_buff *skb, |
585 | struct netlink_callback *cb, | |
586 | struct net_device *dev, | |
587 | int idx) | |
b078f0df | 588 | { |
77162022 JF |
589 | struct net_bridge *br = netdev_priv(dev); |
590 | int i; | |
b078f0df | 591 | |
77162022 JF |
592 | if (!(dev->priv_flags & IFF_EBRIDGE)) |
593 | goto out; | |
b078f0df | 594 | |
77162022 JF |
595 | for (i = 0; i < BR_HASH_SIZE; i++) { |
596 | struct hlist_node *h; | |
597 | struct net_bridge_fdb_entry *f; | |
b078f0df | 598 | |
77162022 JF |
599 | hlist_for_each_entry_rcu(f, h, &br->hash[i], hlist) { |
600 | if (idx < cb->args[0]) | |
601 | goto skip; | |
602 | ||
603 | if (fdb_fill_info(skb, br, f, | |
15e47304 | 604 | NETLINK_CB(cb->skb).portid, |
77162022 JF |
605 | cb->nlh->nlmsg_seq, |
606 | RTM_NEWNEIGH, | |
607 | NLM_F_MULTI) < 0) | |
608 | break; | |
b078f0df | 609 | skip: |
77162022 | 610 | ++idx; |
b078f0df | 611 | } |
612 | } | |
b078f0df | 613 | |
77162022 JF |
614 | out: |
615 | return idx; | |
b078f0df | 616 | } |
36fd2b63 | 617 | |
292d1398 | 618 | /* Update (create or replace) forwarding database entry */ |
36fd2b63 | 619 | static int fdb_add_entry(struct net_bridge_port *source, const __u8 *addr, |
2ba071ec | 620 | __u16 state, __u16 flags, __u16 vid) |
36fd2b63 | 621 | { |
622 | struct net_bridge *br = source->br; | |
2ba071ec | 623 | struct hlist_head *head = &br->hash[br_mac_hash(addr, vid)]; |
36fd2b63 | 624 | struct net_bridge_fdb_entry *fdb; |
625 | ||
2ba071ec | 626 | fdb = fdb_find(head, addr, vid); |
64af1bac | 627 | if (fdb == NULL) { |
628 | if (!(flags & NLM_F_CREATE)) | |
629 | return -ENOENT; | |
36fd2b63 | 630 | |
2ba071ec | 631 | fdb = fdb_create(head, source, addr, vid); |
64af1bac | 632 | if (!fdb) |
633 | return -ENOMEM; | |
31e8a49c | 634 | fdb_notify(br, fdb, RTM_NEWNEIGH); |
64af1bac | 635 | } else { |
636 | if (flags & NLM_F_EXCL) | |
637 | return -EEXIST; | |
292d1398 | 638 | } |
639 | ||
640 | if (fdb_to_nud(fdb) != state) { | |
641 | if (state & NUD_PERMANENT) | |
642 | fdb->is_local = fdb->is_static = 1; | |
643 | else if (state & NUD_NOARP) { | |
644 | fdb->is_local = 0; | |
645 | fdb->is_static = 1; | |
646 | } else | |
647 | fdb->is_local = fdb->is_static = 0; | |
64af1bac | 648 | |
292d1398 | 649 | fdb->updated = fdb->used = jiffies; |
31e8a49c | 650 | fdb_notify(br, fdb, RTM_NEWNEIGH); |
64af1bac | 651 | } |
36fd2b63 | 652 | |
36fd2b63 | 653 | return 0; |
654 | } | |
655 | ||
1690be63 VY |
656 | static int __br_fdb_add(struct ndmsg *ndm, struct net_bridge_port *p, |
657 | const unsigned char *addr, u16 nlh_flags, u16 vid) | |
658 | { | |
659 | int err = 0; | |
660 | ||
661 | if (ndm->ndm_flags & NTF_USE) { | |
662 | rcu_read_lock(); | |
663 | br_fdb_update(p->br, p, addr, vid); | |
664 | rcu_read_unlock(); | |
665 | } else { | |
666 | spin_lock_bh(&p->br->hash_lock); | |
667 | err = fdb_add_entry(p, addr, ndm->ndm_state, | |
668 | nlh_flags, vid); | |
669 | spin_unlock_bh(&p->br->hash_lock); | |
670 | } | |
671 | ||
672 | return err; | |
673 | } | |
674 | ||
36fd2b63 | 675 | /* Add new permanent fdb entry with RTM_NEWNEIGH */ |
edc7d573 | 676 | int br_fdb_add(struct ndmsg *ndm, struct nlattr *tb[], |
677 | struct net_device *dev, | |
6b6e2725 | 678 | const unsigned char *addr, u16 nlh_flags) |
36fd2b63 | 679 | { |
36fd2b63 | 680 | struct net_bridge_port *p; |
77162022 | 681 | int err = 0; |
1690be63 VY |
682 | struct net_port_vlans *pv; |
683 | unsigned short vid = VLAN_N_VID; | |
36fd2b63 | 684 | |
292d1398 | 685 | if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_NOARP|NUD_REACHABLE))) { |
686 | pr_info("bridge: RTM_NEWNEIGH with invalid state %#x\n", ndm->ndm_state); | |
687 | return -EINVAL; | |
688 | } | |
689 | ||
1690be63 VY |
690 | if (tb[NDA_VLAN]) { |
691 | if (nla_len(tb[NDA_VLAN]) != sizeof(unsigned short)) { | |
692 | pr_info("bridge: RTM_NEWNEIGH with invalid vlan\n"); | |
693 | return -EINVAL; | |
694 | } | |
695 | ||
696 | vid = nla_get_u16(tb[NDA_VLAN]); | |
697 | ||
698 | if (vid >= VLAN_N_VID) { | |
699 | pr_info("bridge: RTM_NEWNEIGH with invalid vlan id %d\n", | |
700 | vid); | |
701 | return -EINVAL; | |
702 | } | |
703 | } | |
704 | ||
36fd2b63 | 705 | p = br_port_get_rtnl(dev); |
706 | if (p == NULL) { | |
707 | pr_info("bridge: RTM_NEWNEIGH %s not a bridge port\n", | |
708 | dev->name); | |
709 | return -EINVAL; | |
710 | } | |
711 | ||
1690be63 VY |
712 | pv = nbp_get_vlan_info(p); |
713 | if (vid != VLAN_N_VID) { | |
714 | if (!pv || !test_bit(vid, pv->vlan_bitmap)) { | |
715 | pr_info("bridge: RTM_NEWNEIGH with unconfigured " | |
716 | "vlan %d on port %s\n", vid, dev->name); | |
717 | return -EINVAL; | |
718 | } | |
719 | ||
720 | /* VID was specified, so use it. */ | |
721 | err = __br_fdb_add(ndm, p, addr, nlh_flags, vid); | |
292d1398 | 722 | } else { |
1690be63 VY |
723 | if (!pv || bitmap_empty(pv->vlan_bitmap, BR_VLAN_BITMAP_LEN)) { |
724 | err = __br_fdb_add(ndm, p, addr, nlh_flags, 0); | |
725 | goto out; | |
726 | } | |
727 | ||
728 | /* We have vlans configured on this port and user didn't | |
729 | * specify a VLAN. To be nice, add/update entry for every | |
730 | * vlan on this port. | |
731 | */ | |
732 | vid = find_first_bit(pv->vlan_bitmap, BR_VLAN_BITMAP_LEN); | |
733 | while (vid < BR_VLAN_BITMAP_LEN) { | |
734 | err = __br_fdb_add(ndm, p, addr, nlh_flags, vid); | |
735 | if (err) | |
736 | goto out; | |
737 | vid = find_next_bit(pv->vlan_bitmap, | |
738 | BR_VLAN_BITMAP_LEN, vid+1); | |
739 | } | |
292d1398 | 740 | } |
36fd2b63 | 741 | |
1690be63 | 742 | out: |
36fd2b63 | 743 | return err; |
744 | } | |
745 | ||
bc9a25d2 VY |
746 | int fdb_delete_by_addr(struct net_bridge *br, const u8 *addr, |
747 | u16 vlan) | |
36fd2b63 | 748 | { |
1690be63 | 749 | struct hlist_head *head = &br->hash[br_mac_hash(addr, vlan)]; |
36fd2b63 | 750 | struct net_bridge_fdb_entry *fdb; |
751 | ||
1690be63 | 752 | fdb = fdb_find(head, addr, vlan); |
36fd2b63 | 753 | if (!fdb) |
754 | return -ENOENT; | |
755 | ||
1690be63 | 756 | fdb_delete(br, fdb); |
36fd2b63 | 757 | return 0; |
758 | } | |
759 | ||
1690be63 VY |
760 | static int __br_fdb_delete(struct net_bridge_port *p, |
761 | const unsigned char *addr, u16 vid) | |
762 | { | |
763 | int err; | |
764 | ||
765 | spin_lock_bh(&p->br->hash_lock); | |
766 | err = fdb_delete_by_addr(p->br, addr, vid); | |
767 | spin_unlock_bh(&p->br->hash_lock); | |
768 | ||
769 | return err; | |
770 | } | |
771 | ||
36fd2b63 | 772 | /* Remove neighbor entry with RTM_DELNEIGH */ |
1690be63 VY |
773 | int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[], |
774 | struct net_device *dev, | |
6b6e2725 | 775 | const unsigned char *addr) |
36fd2b63 | 776 | { |
36fd2b63 | 777 | struct net_bridge_port *p; |
36fd2b63 | 778 | int err; |
1690be63 VY |
779 | struct net_port_vlans *pv; |
780 | unsigned short vid = VLAN_N_VID; | |
36fd2b63 | 781 | |
1690be63 VY |
782 | if (tb[NDA_VLAN]) { |
783 | if (nla_len(tb[NDA_VLAN]) != sizeof(unsigned short)) { | |
784 | pr_info("bridge: RTM_NEWNEIGH with invalid vlan\n"); | |
785 | return -EINVAL; | |
786 | } | |
787 | ||
788 | vid = nla_get_u16(tb[NDA_VLAN]); | |
789 | ||
790 | if (vid >= VLAN_N_VID) { | |
791 | pr_info("bridge: RTM_NEWNEIGH with invalid vlan id %d\n", | |
792 | vid); | |
793 | return -EINVAL; | |
794 | } | |
795 | } | |
36fd2b63 | 796 | p = br_port_get_rtnl(dev); |
797 | if (p == NULL) { | |
798 | pr_info("bridge: RTM_DELNEIGH %s not a bridge port\n", | |
799 | dev->name); | |
800 | return -EINVAL; | |
801 | } | |
802 | ||
1690be63 VY |
803 | pv = nbp_get_vlan_info(p); |
804 | if (vid != VLAN_N_VID) { | |
805 | if (!pv || !test_bit(vid, pv->vlan_bitmap)) { | |
806 | pr_info("bridge: RTM_DELNEIGH with unconfigured " | |
807 | "vlan %d on port %s\n", vid, dev->name); | |
808 | return -EINVAL; | |
809 | } | |
36fd2b63 | 810 | |
1690be63 VY |
811 | err = __br_fdb_delete(p, addr, vid); |
812 | } else { | |
813 | if (!pv || bitmap_empty(pv->vlan_bitmap, BR_VLAN_BITMAP_LEN)) { | |
814 | err = __br_fdb_delete(p, addr, 0); | |
815 | goto out; | |
816 | } | |
817 | ||
818 | /* We have vlans configured on this port and user didn't | |
819 | * specify a VLAN. To be nice, add/update entry for every | |
820 | * vlan on this port. | |
821 | */ | |
822 | err = -ENOENT; | |
823 | vid = find_first_bit(pv->vlan_bitmap, BR_VLAN_BITMAP_LEN); | |
824 | while (vid < BR_VLAN_BITMAP_LEN) { | |
825 | err &= __br_fdb_delete(p, addr, vid); | |
826 | vid = find_next_bit(pv->vlan_bitmap, | |
827 | BR_VLAN_BITMAP_LEN, vid+1); | |
828 | } | |
829 | } | |
830 | out: | |
36fd2b63 | 831 | return err; |
832 | } |