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; | |
2836882f TM |
95 | struct net_port_vlans *pv = nbp_get_vlan_info(p); |
96 | bool no_vlan = !pv; | |
1da177e4 | 97 | int i; |
2836882f | 98 | u16 vid; |
9d6f229f | 99 | |
1da177e4 LT |
100 | spin_lock_bh(&br->hash_lock); |
101 | ||
102 | /* Search all chains since old address/hash is unknown */ | |
103 | for (i = 0; i < BR_HASH_SIZE; i++) { | |
104 | struct hlist_node *h; | |
105 | hlist_for_each(h, &br->hash[i]) { | |
106 | struct net_bridge_fdb_entry *f; | |
107 | ||
108 | f = hlist_entry(h, struct net_bridge_fdb_entry, hlist); | |
a5642ab4 | 109 | if (f->dst == p && f->is_local && !f->added_by_user) { |
1da177e4 LT |
110 | /* maybe another port has same hw addr? */ |
111 | struct net_bridge_port *op; | |
bc9a25d2 | 112 | u16 vid = f->vlan_id; |
1da177e4 | 113 | list_for_each_entry(op, &br->port_list, list) { |
9d6f229f | 114 | if (op != p && |
9a7b6ef9 | 115 | ether_addr_equal(op->dev->dev_addr, |
bc9a25d2 | 116 | f->addr.addr) && |
2b292fb4 | 117 | (!vid || nbp_vlan_find(op, vid))) { |
1da177e4 | 118 | f->dst = op; |
2836882f | 119 | goto skip_delete; |
1da177e4 LT |
120 | } |
121 | } | |
122 | ||
2b292fb4 TM |
123 | /* maybe bridge device has same hw addr? */ |
124 | if (ether_addr_equal(br->dev->dev_addr, | |
125 | f->addr.addr) && | |
126 | (!vid || br_vlan_find(br, vid))) { | |
127 | f->dst = NULL; | |
128 | goto skip_delete; | |
129 | } | |
130 | ||
1da177e4 | 131 | /* delete old one */ |
31e8a49c | 132 | fdb_delete(br, f); |
2836882f | 133 | skip_delete: |
bc9a25d2 VY |
134 | /* if this port has no vlan information |
135 | * configured, we can safely be done at | |
136 | * this point. | |
137 | */ | |
138 | if (no_vlan) | |
2836882f | 139 | goto insert; |
1da177e4 LT |
140 | } |
141 | } | |
142 | } | |
1da177e4 | 143 | |
2836882f TM |
144 | insert: |
145 | /* insert new address, may fail if invalid address or dup. */ | |
146 | fdb_insert(br, p, newaddr, 0); | |
147 | ||
148 | if (no_vlan) | |
149 | goto done; | |
150 | ||
151 | /* Now add entries for every VLAN configured on the port. | |
152 | * This function runs under RTNL so the bitmap will not change | |
153 | * from under us. | |
154 | */ | |
155 | for_each_set_bit(vid, pv->vlan_bitmap, VLAN_N_VID) | |
156 | fdb_insert(br, p, newaddr, vid); | |
157 | ||
bc9a25d2 | 158 | done: |
1da177e4 LT |
159 | spin_unlock_bh(&br->hash_lock); |
160 | } | |
161 | ||
43598813 | 162 | void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr) |
163 | { | |
164 | struct net_bridge_fdb_entry *f; | |
bc9a25d2 VY |
165 | struct net_port_vlans *pv; |
166 | u16 vid = 0; | |
43598813 | 167 | |
168 | /* If old entry was unassociated with any port, then delete it. */ | |
2ba071ec | 169 | f = __br_fdb_get(br, br->dev->dev_addr, 0); |
43598813 | 170 | if (f && f->is_local && !f->dst) |
171 | fdb_delete(br, f); | |
172 | ||
bc9a25d2 VY |
173 | fdb_insert(br, NULL, newaddr, 0); |
174 | ||
175 | /* Now remove and add entries for every VLAN configured on the | |
176 | * bridge. This function runs under RTNL so the bitmap will not | |
177 | * change from under us. | |
178 | */ | |
179 | pv = br_get_vlan_info(br); | |
180 | if (!pv) | |
181 | return; | |
182 | ||
ef40b7ef | 183 | for_each_set_bit_from(vid, pv->vlan_bitmap, VLAN_N_VID) { |
bc9a25d2 VY |
184 | f = __br_fdb_get(br, br->dev->dev_addr, vid); |
185 | if (f && f->is_local && !f->dst) | |
186 | fdb_delete(br, f); | |
187 | fdb_insert(br, NULL, newaddr, vid); | |
188 | } | |
43598813 | 189 | } |
190 | ||
1da177e4 LT |
191 | void br_fdb_cleanup(unsigned long _data) |
192 | { | |
193 | struct net_bridge *br = (struct net_bridge *)_data; | |
194 | unsigned long delay = hold_time(br); | |
25442e06 | 195 | unsigned long next_timer = jiffies + br->ageing_time; |
1da177e4 LT |
196 | int i; |
197 | ||
27a42938 | 198 | spin_lock(&br->hash_lock); |
1da177e4 LT |
199 | for (i = 0; i < BR_HASH_SIZE; i++) { |
200 | struct net_bridge_fdb_entry *f; | |
b67bfe0d | 201 | struct hlist_node *n; |
1da177e4 | 202 | |
b67bfe0d | 203 | hlist_for_each_entry_safe(f, n, &br->hash[i], hlist) { |
071f7722 BE |
204 | unsigned long this_timer; |
205 | if (f->is_static) | |
206 | continue; | |
7cd8861a | 207 | this_timer = f->updated + delay; |
071f7722 | 208 | if (time_before_eq(this_timer, jiffies)) |
31e8a49c | 209 | fdb_delete(br, f); |
2bec008c | 210 | else if (time_before(this_timer, next_timer)) |
071f7722 | 211 | next_timer = this_timer; |
1da177e4 LT |
212 | } |
213 | } | |
27a42938 | 214 | spin_unlock(&br->hash_lock); |
1da177e4 | 215 | |
25442e06 | 216 | mod_timer(&br->gc_timer, round_jiffies_up(next_timer)); |
1da177e4 LT |
217 | } |
218 | ||
9cf63747 SH |
219 | /* Completely flush all dynamic entries in forwarding database.*/ |
220 | void br_fdb_flush(struct net_bridge *br) | |
221 | { | |
222 | int i; | |
223 | ||
224 | spin_lock_bh(&br->hash_lock); | |
225 | for (i = 0; i < BR_HASH_SIZE; i++) { | |
226 | struct net_bridge_fdb_entry *f; | |
b67bfe0d SL |
227 | struct hlist_node *n; |
228 | hlist_for_each_entry_safe(f, n, &br->hash[i], hlist) { | |
9cf63747 | 229 | if (!f->is_static) |
31e8a49c | 230 | fdb_delete(br, f); |
9cf63747 SH |
231 | } |
232 | } | |
233 | spin_unlock_bh(&br->hash_lock); | |
234 | } | |
1a620698 | 235 | |
25985edc | 236 | /* Flush all entries referring to a specific port. |
9cf63747 SH |
237 | * if do_all is set also flush static entries |
238 | */ | |
1a620698 SH |
239 | void br_fdb_delete_by_port(struct net_bridge *br, |
240 | const struct net_bridge_port *p, | |
241 | int do_all) | |
1da177e4 LT |
242 | { |
243 | int i; | |
244 | ||
245 | spin_lock_bh(&br->hash_lock); | |
246 | for (i = 0; i < BR_HASH_SIZE; i++) { | |
247 | struct hlist_node *h, *g; | |
9d6f229f | 248 | |
1da177e4 LT |
249 | hlist_for_each_safe(h, g, &br->hash[i]) { |
250 | struct net_bridge_fdb_entry *f | |
251 | = hlist_entry(h, struct net_bridge_fdb_entry, hlist); | |
9d6f229f | 252 | if (f->dst != p) |
1da177e4 LT |
253 | continue; |
254 | ||
1a620698 SH |
255 | if (f->is_static && !do_all) |
256 | continue; | |
1da177e4 LT |
257 | /* |
258 | * if multiple ports all have the same device address | |
259 | * then when one port is deleted, assign | |
260 | * the local entry to other port | |
261 | */ | |
262 | if (f->is_local) { | |
263 | struct net_bridge_port *op; | |
264 | list_for_each_entry(op, &br->port_list, list) { | |
9d6f229f | 265 | if (op != p && |
9a7b6ef9 JP |
266 | ether_addr_equal(op->dev->dev_addr, |
267 | f->addr.addr)) { | |
1da177e4 | 268 | f->dst = op; |
a5642ab4 | 269 | f->added_by_user = 0; |
1da177e4 LT |
270 | goto skip_delete; |
271 | } | |
272 | } | |
273 | } | |
274 | ||
31e8a49c | 275 | fdb_delete(br, f); |
1da177e4 LT |
276 | skip_delete: ; |
277 | } | |
278 | } | |
279 | spin_unlock_bh(&br->hash_lock); | |
280 | } | |
281 | ||
eeaf61d8 | 282 | /* No locking or refcounting, assumes caller has rcu_read_lock */ |
1da177e4 | 283 | struct net_bridge_fdb_entry *__br_fdb_get(struct net_bridge *br, |
2ba071ec VY |
284 | const unsigned char *addr, |
285 | __u16 vid) | |
1da177e4 | 286 | { |
1da177e4 LT |
287 | struct net_bridge_fdb_entry *fdb; |
288 | ||
b67bfe0d | 289 | hlist_for_each_entry_rcu(fdb, |
2ba071ec VY |
290 | &br->hash[br_mac_hash(addr, vid)], hlist) { |
291 | if (ether_addr_equal(fdb->addr.addr, addr) && | |
292 | fdb->vlan_id == vid) { | |
1da177e4 LT |
293 | if (unlikely(has_expired(br, fdb))) |
294 | break; | |
295 | return fdb; | |
296 | } | |
297 | } | |
298 | ||
299 | return NULL; | |
300 | } | |
301 | ||
e6373c4c | 302 | #if IS_ENABLED(CONFIG_ATM_LANE) |
da678292 MM |
303 | /* Interface used by ATM LANE hook to test |
304 | * if an addr is on some other bridge port */ | |
305 | int br_fdb_test_addr(struct net_device *dev, unsigned char *addr) | |
1da177e4 LT |
306 | { |
307 | struct net_bridge_fdb_entry *fdb; | |
b5ed54e9 | 308 | struct net_bridge_port *port; |
da678292 MM |
309 | int ret; |
310 | ||
1da177e4 | 311 | rcu_read_lock(); |
b5ed54e9 | 312 | port = br_port_get_rcu(dev); |
313 | if (!port) | |
314 | ret = 0; | |
315 | else { | |
2ba071ec | 316 | fdb = __br_fdb_get(port->br, addr, 0); |
43598813 | 317 | ret = fdb && fdb->dst && fdb->dst->dev != dev && |
b5ed54e9 | 318 | fdb->dst->state == BR_STATE_FORWARDING; |
319 | } | |
1da177e4 | 320 | rcu_read_unlock(); |
1da177e4 | 321 | |
da678292 | 322 | return ret; |
1da177e4 | 323 | } |
da678292 | 324 | #endif /* CONFIG_ATM_LANE */ |
1da177e4 LT |
325 | |
326 | /* | |
9d6f229f | 327 | * Fill buffer with forwarding table records in |
1da177e4 LT |
328 | * the API format. |
329 | */ | |
330 | int br_fdb_fillbuf(struct net_bridge *br, void *buf, | |
331 | unsigned long maxnum, unsigned long skip) | |
332 | { | |
333 | struct __fdb_entry *fe = buf; | |
334 | int i, num = 0; | |
1da177e4 LT |
335 | struct net_bridge_fdb_entry *f; |
336 | ||
337 | memset(buf, 0, maxnum*sizeof(struct __fdb_entry)); | |
338 | ||
339 | rcu_read_lock(); | |
340 | for (i = 0; i < BR_HASH_SIZE; i++) { | |
b67bfe0d | 341 | hlist_for_each_entry_rcu(f, &br->hash[i], hlist) { |
1da177e4 LT |
342 | if (num >= maxnum) |
343 | goto out; | |
344 | ||
9d6f229f | 345 | if (has_expired(br, f)) |
1da177e4 LT |
346 | continue; |
347 | ||
43598813 | 348 | /* ignore pseudo entry for local MAC address */ |
349 | if (!f->dst) | |
350 | continue; | |
351 | ||
1da177e4 LT |
352 | if (skip) { |
353 | --skip; | |
354 | continue; | |
355 | } | |
356 | ||
357 | /* convert from internal format to API */ | |
358 | memcpy(fe->mac_addr, f->addr.addr, ETH_ALEN); | |
ae4f8fca SH |
359 | |
360 | /* due to ABI compat need to split into hi/lo */ | |
1da177e4 | 361 | fe->port_no = f->dst->port_no; |
ae4f8fca SH |
362 | fe->port_hi = f->dst->port_no >> 8; |
363 | ||
1da177e4 LT |
364 | fe->is_local = f->is_local; |
365 | if (!f->is_static) | |
a399a805 | 366 | fe->ageing_timer_value = jiffies_delta_to_clock_t(jiffies - f->updated); |
1da177e4 LT |
367 | ++fe; |
368 | ++num; | |
369 | } | |
370 | } | |
371 | ||
372 | out: | |
373 | rcu_read_unlock(); | |
374 | ||
375 | return num; | |
376 | } | |
377 | ||
664de48b | 378 | static struct net_bridge_fdb_entry *fdb_find(struct hlist_head *head, |
2ba071ec VY |
379 | const unsigned char *addr, |
380 | __u16 vid) | |
664de48b | 381 | { |
664de48b | 382 | struct net_bridge_fdb_entry *fdb; |
383 | ||
b67bfe0d | 384 | hlist_for_each_entry(fdb, head, hlist) { |
2ba071ec VY |
385 | if (ether_addr_equal(fdb->addr.addr, addr) && |
386 | fdb->vlan_id == vid) | |
664de48b | 387 | return fdb; |
388 | } | |
389 | return NULL; | |
390 | } | |
391 | ||
392 | static struct net_bridge_fdb_entry *fdb_find_rcu(struct hlist_head *head, | |
2ba071ec VY |
393 | const unsigned char *addr, |
394 | __u16 vid) | |
1da177e4 | 395 | { |
1da177e4 LT |
396 | struct net_bridge_fdb_entry *fdb; |
397 | ||
b67bfe0d | 398 | hlist_for_each_entry_rcu(fdb, head, hlist) { |
2ba071ec VY |
399 | if (ether_addr_equal(fdb->addr.addr, addr) && |
400 | fdb->vlan_id == vid) | |
1da177e4 LT |
401 | return fdb; |
402 | } | |
403 | return NULL; | |
404 | } | |
405 | ||
406 | static struct net_bridge_fdb_entry *fdb_create(struct hlist_head *head, | |
407 | struct net_bridge_port *source, | |
2ba071ec VY |
408 | const unsigned char *addr, |
409 | __u16 vid) | |
1da177e4 LT |
410 | { |
411 | struct net_bridge_fdb_entry *fdb; | |
412 | ||
413 | fdb = kmem_cache_alloc(br_fdb_cache, GFP_ATOMIC); | |
414 | if (fdb) { | |
415 | memcpy(fdb->addr.addr, addr, ETH_ALEN); | |
1da177e4 | 416 | fdb->dst = source; |
2ba071ec | 417 | fdb->vlan_id = vid; |
03e9b64b | 418 | fdb->is_local = 0; |
419 | fdb->is_static = 0; | |
a5642ab4 | 420 | fdb->added_by_user = 0; |
7cd8861a | 421 | fdb->updated = fdb->used = jiffies; |
1158f762 | 422 | hlist_add_head_rcu(&fdb->hlist, head); |
1da177e4 LT |
423 | } |
424 | return fdb; | |
425 | } | |
426 | ||
427 | static int fdb_insert(struct net_bridge *br, struct net_bridge_port *source, | |
bc9a25d2 | 428 | const unsigned char *addr, u16 vid) |
1da177e4 | 429 | { |
bc9a25d2 | 430 | struct hlist_head *head = &br->hash[br_mac_hash(addr, vid)]; |
1da177e4 LT |
431 | struct net_bridge_fdb_entry *fdb; |
432 | ||
433 | if (!is_valid_ether_addr(addr)) | |
434 | return -EINVAL; | |
435 | ||
bc9a25d2 | 436 | fdb = fdb_find(head, addr, vid); |
1da177e4 | 437 | if (fdb) { |
9d6f229f | 438 | /* it is okay to have multiple ports with same |
1da177e4 LT |
439 | * address, just use the first one. |
440 | */ | |
9d6f229f | 441 | if (fdb->is_local) |
1da177e4 | 442 | return 0; |
28a16c97 | 443 | br_warn(br, "adding interface %s with same address " |
1da177e4 | 444 | "as a received packet\n", |
9b46922e | 445 | source ? source->dev->name : br->dev->name); |
31e8a49c | 446 | fdb_delete(br, fdb); |
9d6f229f | 447 | } |
1da177e4 | 448 | |
bc9a25d2 | 449 | fdb = fdb_create(head, source, addr, vid); |
03e9b64b | 450 | if (!fdb) |
1da177e4 LT |
451 | return -ENOMEM; |
452 | ||
03e9b64b | 453 | fdb->is_local = fdb->is_static = 1; |
31e8a49c | 454 | fdb_notify(br, fdb, RTM_NEWNEIGH); |
1da177e4 LT |
455 | return 0; |
456 | } | |
457 | ||
03e9b64b | 458 | /* Add entry for local address of interface */ |
1da177e4 | 459 | int br_fdb_insert(struct net_bridge *br, struct net_bridge_port *source, |
bc9a25d2 | 460 | const unsigned char *addr, u16 vid) |
1da177e4 LT |
461 | { |
462 | int ret; | |
463 | ||
464 | spin_lock_bh(&br->hash_lock); | |
bc9a25d2 | 465 | ret = fdb_insert(br, source, addr, vid); |
1da177e4 LT |
466 | spin_unlock_bh(&br->hash_lock); |
467 | return ret; | |
468 | } | |
469 | ||
470 | void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source, | |
a5642ab4 | 471 | const unsigned char *addr, u16 vid, bool added_by_user) |
1da177e4 | 472 | { |
2ba071ec | 473 | struct hlist_head *head = &br->hash[br_mac_hash(addr, vid)]; |
1da177e4 LT |
474 | struct net_bridge_fdb_entry *fdb; |
475 | ||
476 | /* some users want to always flood. */ | |
477 | if (hold_time(br) == 0) | |
478 | return; | |
479 | ||
df1c0b84 SH |
480 | /* ignore packets unless we are using this port */ |
481 | if (!(source->state == BR_STATE_LEARNING || | |
482 | source->state == BR_STATE_FORWARDING)) | |
483 | return; | |
484 | ||
2ba071ec | 485 | fdb = fdb_find_rcu(head, addr, vid); |
1da177e4 LT |
486 | if (likely(fdb)) { |
487 | /* attempt to update an entry for a local interface */ | |
488 | if (unlikely(fdb->is_local)) { | |
9d6f229f | 489 | if (net_ratelimit()) |
28a16c97 | 490 | br_warn(br, "received packet on %s with " |
491 | "own address as source address\n", | |
492 | source->dev->name); | |
1da177e4 LT |
493 | } else { |
494 | /* fastpath: update of existing entry */ | |
495 | fdb->dst = source; | |
7cd8861a | 496 | fdb->updated = jiffies; |
a5642ab4 TM |
497 | if (unlikely(added_by_user)) |
498 | fdb->added_by_user = 1; | |
1da177e4 LT |
499 | } |
500 | } else { | |
f8ae737d | 501 | spin_lock(&br->hash_lock); |
2ba071ec VY |
502 | if (likely(!fdb_find(head, addr, vid))) { |
503 | fdb = fdb_create(head, source, addr, vid); | |
a5642ab4 TM |
504 | if (fdb) { |
505 | if (unlikely(added_by_user)) | |
506 | fdb->added_by_user = 1; | |
31e8a49c | 507 | fdb_notify(br, fdb, RTM_NEWNEIGH); |
a5642ab4 | 508 | } |
f58ee4e1 | 509 | } |
1da177e4 LT |
510 | /* else we lose race and someone else inserts |
511 | * it first, don't bother updating | |
512 | */ | |
f8ae737d | 513 | spin_unlock(&br->hash_lock); |
1da177e4 | 514 | } |
1da177e4 | 515 | } |
b078f0df | 516 | |
517 | static int fdb_to_nud(const struct net_bridge_fdb_entry *fdb) | |
518 | { | |
519 | if (fdb->is_local) | |
520 | return NUD_PERMANENT; | |
521 | else if (fdb->is_static) | |
522 | return NUD_NOARP; | |
523 | else if (has_expired(fdb->dst->br, fdb)) | |
524 | return NUD_STALE; | |
525 | else | |
526 | return NUD_REACHABLE; | |
527 | } | |
528 | ||
31e8a49c | 529 | static int fdb_fill_info(struct sk_buff *skb, const struct net_bridge *br, |
b078f0df | 530 | const struct net_bridge_fdb_entry *fdb, |
15e47304 | 531 | u32 portid, u32 seq, int type, unsigned int flags) |
b078f0df | 532 | { |
533 | unsigned long now = jiffies; | |
534 | struct nda_cacheinfo ci; | |
535 | struct nlmsghdr *nlh; | |
536 | struct ndmsg *ndm; | |
537 | ||
15e47304 | 538 | nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags); |
b078f0df | 539 | if (nlh == NULL) |
540 | return -EMSGSIZE; | |
541 | ||
b078f0df | 542 | ndm = nlmsg_data(nlh); |
543 | ndm->ndm_family = AF_BRIDGE; | |
544 | ndm->ndm_pad1 = 0; | |
545 | ndm->ndm_pad2 = 0; | |
546 | ndm->ndm_flags = 0; | |
547 | ndm->ndm_type = 0; | |
43598813 | 548 | ndm->ndm_ifindex = fdb->dst ? fdb->dst->dev->ifindex : br->dev->ifindex; |
b078f0df | 549 | ndm->ndm_state = fdb_to_nud(fdb); |
550 | ||
2eb812e6 DM |
551 | if (nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->addr)) |
552 | goto nla_put_failure; | |
b078f0df | 553 | ci.ndm_used = jiffies_to_clock_t(now - fdb->used); |
554 | ci.ndm_confirmed = 0; | |
555 | ci.ndm_updated = jiffies_to_clock_t(now - fdb->updated); | |
556 | ci.ndm_refcnt = 0; | |
2eb812e6 DM |
557 | if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci)) |
558 | goto nla_put_failure; | |
1690be63 VY |
559 | |
560 | if (nla_put(skb, NDA_VLAN, sizeof(u16), &fdb->vlan_id)) | |
561 | goto nla_put_failure; | |
562 | ||
b078f0df | 563 | return nlmsg_end(skb, nlh); |
564 | ||
565 | nla_put_failure: | |
566 | nlmsg_cancel(skb, nlh); | |
567 | return -EMSGSIZE; | |
568 | } | |
569 | ||
570 | static inline size_t fdb_nlmsg_size(void) | |
571 | { | |
572 | return NLMSG_ALIGN(sizeof(struct ndmsg)) | |
573 | + nla_total_size(ETH_ALEN) /* NDA_LLADDR */ | |
1690be63 | 574 | + nla_total_size(sizeof(u16)) /* NDA_VLAN */ |
b078f0df | 575 | + nla_total_size(sizeof(struct nda_cacheinfo)); |
576 | } | |
577 | ||
31e8a49c | 578 | static void fdb_notify(struct net_bridge *br, |
579 | const struct net_bridge_fdb_entry *fdb, int type) | |
b078f0df | 580 | { |
31e8a49c | 581 | struct net *net = dev_net(br->dev); |
b078f0df | 582 | struct sk_buff *skb; |
583 | int err = -ENOBUFS; | |
584 | ||
585 | skb = nlmsg_new(fdb_nlmsg_size(), GFP_ATOMIC); | |
586 | if (skb == NULL) | |
587 | goto errout; | |
588 | ||
31e8a49c | 589 | err = fdb_fill_info(skb, br, fdb, 0, 0, type, 0); |
b078f0df | 590 | if (err < 0) { |
591 | /* -EMSGSIZE implies BUG in fdb_nlmsg_size() */ | |
592 | WARN_ON(err == -EMSGSIZE); | |
593 | kfree_skb(skb); | |
594 | goto errout; | |
595 | } | |
596 | rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC); | |
597 | return; | |
598 | errout: | |
87e823b3 | 599 | rtnl_set_sk_err(net, RTNLGRP_NEIGH, err); |
b078f0df | 600 | } |
601 | ||
602 | /* Dump information about entries, in response to GETNEIGH */ | |
77162022 JF |
603 | int br_fdb_dump(struct sk_buff *skb, |
604 | struct netlink_callback *cb, | |
605 | struct net_device *dev, | |
606 | int idx) | |
b078f0df | 607 | { |
77162022 JF |
608 | struct net_bridge *br = netdev_priv(dev); |
609 | int i; | |
b078f0df | 610 | |
77162022 JF |
611 | if (!(dev->priv_flags & IFF_EBRIDGE)) |
612 | goto out; | |
b078f0df | 613 | |
77162022 | 614 | for (i = 0; i < BR_HASH_SIZE; i++) { |
77162022 | 615 | struct net_bridge_fdb_entry *f; |
b078f0df | 616 | |
b67bfe0d | 617 | hlist_for_each_entry_rcu(f, &br->hash[i], hlist) { |
77162022 JF |
618 | if (idx < cb->args[0]) |
619 | goto skip; | |
620 | ||
621 | if (fdb_fill_info(skb, br, f, | |
15e47304 | 622 | NETLINK_CB(cb->skb).portid, |
77162022 JF |
623 | cb->nlh->nlmsg_seq, |
624 | RTM_NEWNEIGH, | |
625 | NLM_F_MULTI) < 0) | |
626 | break; | |
b078f0df | 627 | skip: |
77162022 | 628 | ++idx; |
b078f0df | 629 | } |
630 | } | |
b078f0df | 631 | |
77162022 JF |
632 | out: |
633 | return idx; | |
b078f0df | 634 | } |
36fd2b63 | 635 | |
292d1398 | 636 | /* Update (create or replace) forwarding database entry */ |
36fd2b63 | 637 | static int fdb_add_entry(struct net_bridge_port *source, const __u8 *addr, |
2ba071ec | 638 | __u16 state, __u16 flags, __u16 vid) |
36fd2b63 | 639 | { |
640 | struct net_bridge *br = source->br; | |
2ba071ec | 641 | struct hlist_head *head = &br->hash[br_mac_hash(addr, vid)]; |
36fd2b63 | 642 | struct net_bridge_fdb_entry *fdb; |
b0a397fb | 643 | bool modified = false; |
36fd2b63 | 644 | |
2ba071ec | 645 | fdb = fdb_find(head, addr, vid); |
64af1bac | 646 | if (fdb == NULL) { |
647 | if (!(flags & NLM_F_CREATE)) | |
648 | return -ENOENT; | |
36fd2b63 | 649 | |
2ba071ec | 650 | fdb = fdb_create(head, source, addr, vid); |
64af1bac | 651 | if (!fdb) |
652 | return -ENOMEM; | |
b0a397fb | 653 | |
654 | modified = true; | |
64af1bac | 655 | } else { |
656 | if (flags & NLM_F_EXCL) | |
657 | return -EEXIST; | |
b0a397fb | 658 | |
659 | if (fdb->dst != source) { | |
660 | fdb->dst = source; | |
661 | modified = true; | |
662 | } | |
292d1398 | 663 | } |
664 | ||
665 | if (fdb_to_nud(fdb) != state) { | |
666 | if (state & NUD_PERMANENT) | |
667 | fdb->is_local = fdb->is_static = 1; | |
668 | else if (state & NUD_NOARP) { | |
669 | fdb->is_local = 0; | |
670 | fdb->is_static = 1; | |
671 | } else | |
672 | fdb->is_local = fdb->is_static = 0; | |
64af1bac | 673 | |
b0a397fb | 674 | modified = true; |
675 | } | |
a5642ab4 | 676 | fdb->added_by_user = 1; |
b0a397fb | 677 | |
678 | fdb->used = jiffies; | |
679 | if (modified) { | |
680 | fdb->updated = jiffies; | |
31e8a49c | 681 | fdb_notify(br, fdb, RTM_NEWNEIGH); |
64af1bac | 682 | } |
36fd2b63 | 683 | |
36fd2b63 | 684 | return 0; |
685 | } | |
686 | ||
1690be63 VY |
687 | static int __br_fdb_add(struct ndmsg *ndm, struct net_bridge_port *p, |
688 | const unsigned char *addr, u16 nlh_flags, u16 vid) | |
689 | { | |
690 | int err = 0; | |
691 | ||
692 | if (ndm->ndm_flags & NTF_USE) { | |
693 | rcu_read_lock(); | |
a5642ab4 | 694 | br_fdb_update(p->br, p, addr, vid, true); |
1690be63 VY |
695 | rcu_read_unlock(); |
696 | } else { | |
697 | spin_lock_bh(&p->br->hash_lock); | |
698 | err = fdb_add_entry(p, addr, ndm->ndm_state, | |
699 | nlh_flags, vid); | |
700 | spin_unlock_bh(&p->br->hash_lock); | |
701 | } | |
702 | ||
703 | return err; | |
704 | } | |
705 | ||
36fd2b63 | 706 | /* Add new permanent fdb entry with RTM_NEWNEIGH */ |
edc7d573 | 707 | int br_fdb_add(struct ndmsg *ndm, struct nlattr *tb[], |
708 | struct net_device *dev, | |
6b6e2725 | 709 | const unsigned char *addr, u16 nlh_flags) |
36fd2b63 | 710 | { |
36fd2b63 | 711 | struct net_bridge_port *p; |
77162022 | 712 | int err = 0; |
1690be63 VY |
713 | struct net_port_vlans *pv; |
714 | unsigned short vid = VLAN_N_VID; | |
36fd2b63 | 715 | |
292d1398 | 716 | if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_NOARP|NUD_REACHABLE))) { |
717 | pr_info("bridge: RTM_NEWNEIGH with invalid state %#x\n", ndm->ndm_state); | |
718 | return -EINVAL; | |
719 | } | |
720 | ||
1690be63 VY |
721 | if (tb[NDA_VLAN]) { |
722 | if (nla_len(tb[NDA_VLAN]) != sizeof(unsigned short)) { | |
723 | pr_info("bridge: RTM_NEWNEIGH with invalid vlan\n"); | |
724 | return -EINVAL; | |
725 | } | |
726 | ||
727 | vid = nla_get_u16(tb[NDA_VLAN]); | |
728 | ||
8adff41c | 729 | if (!vid || vid >= VLAN_VID_MASK) { |
1690be63 VY |
730 | pr_info("bridge: RTM_NEWNEIGH with invalid vlan id %d\n", |
731 | vid); | |
732 | return -EINVAL; | |
733 | } | |
734 | } | |
735 | ||
537f7f84 SH |
736 | if (is_zero_ether_addr(addr)) { |
737 | pr_info("bridge: RTM_NEWNEIGH with invalid ether address\n"); | |
738 | return -EINVAL; | |
739 | } | |
740 | ||
36fd2b63 | 741 | p = br_port_get_rtnl(dev); |
742 | if (p == NULL) { | |
743 | pr_info("bridge: RTM_NEWNEIGH %s not a bridge port\n", | |
744 | dev->name); | |
745 | return -EINVAL; | |
746 | } | |
747 | ||
1690be63 VY |
748 | pv = nbp_get_vlan_info(p); |
749 | if (vid != VLAN_N_VID) { | |
750 | if (!pv || !test_bit(vid, pv->vlan_bitmap)) { | |
751 | pr_info("bridge: RTM_NEWNEIGH with unconfigured " | |
752 | "vlan %d on port %s\n", vid, dev->name); | |
753 | return -EINVAL; | |
754 | } | |
755 | ||
756 | /* VID was specified, so use it. */ | |
757 | err = __br_fdb_add(ndm, p, addr, nlh_flags, vid); | |
292d1398 | 758 | } else { |
ef40b7ef | 759 | if (!pv || bitmap_empty(pv->vlan_bitmap, VLAN_N_VID)) { |
1690be63 VY |
760 | err = __br_fdb_add(ndm, p, addr, nlh_flags, 0); |
761 | goto out; | |
762 | } | |
763 | ||
764 | /* We have vlans configured on this port and user didn't | |
765 | * specify a VLAN. To be nice, add/update entry for every | |
766 | * vlan on this port. | |
767 | */ | |
ef40b7ef | 768 | for_each_set_bit(vid, pv->vlan_bitmap, VLAN_N_VID) { |
1690be63 VY |
769 | err = __br_fdb_add(ndm, p, addr, nlh_flags, vid); |
770 | if (err) | |
771 | goto out; | |
1690be63 | 772 | } |
292d1398 | 773 | } |
36fd2b63 | 774 | |
1690be63 | 775 | out: |
36fd2b63 | 776 | return err; |
777 | } | |
778 | ||
bc9a25d2 VY |
779 | int fdb_delete_by_addr(struct net_bridge *br, const u8 *addr, |
780 | u16 vlan) | |
36fd2b63 | 781 | { |
1690be63 | 782 | struct hlist_head *head = &br->hash[br_mac_hash(addr, vlan)]; |
36fd2b63 | 783 | struct net_bridge_fdb_entry *fdb; |
784 | ||
1690be63 | 785 | fdb = fdb_find(head, addr, vlan); |
36fd2b63 | 786 | if (!fdb) |
787 | return -ENOENT; | |
788 | ||
1690be63 | 789 | fdb_delete(br, fdb); |
36fd2b63 | 790 | return 0; |
791 | } | |
792 | ||
1690be63 VY |
793 | static int __br_fdb_delete(struct net_bridge_port *p, |
794 | const unsigned char *addr, u16 vid) | |
795 | { | |
796 | int err; | |
797 | ||
798 | spin_lock_bh(&p->br->hash_lock); | |
799 | err = fdb_delete_by_addr(p->br, addr, vid); | |
800 | spin_unlock_bh(&p->br->hash_lock); | |
801 | ||
802 | return err; | |
803 | } | |
804 | ||
36fd2b63 | 805 | /* Remove neighbor entry with RTM_DELNEIGH */ |
1690be63 VY |
806 | int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[], |
807 | struct net_device *dev, | |
6b6e2725 | 808 | const unsigned char *addr) |
36fd2b63 | 809 | { |
36fd2b63 | 810 | struct net_bridge_port *p; |
36fd2b63 | 811 | int err; |
1690be63 VY |
812 | struct net_port_vlans *pv; |
813 | unsigned short vid = VLAN_N_VID; | |
36fd2b63 | 814 | |
1690be63 VY |
815 | if (tb[NDA_VLAN]) { |
816 | if (nla_len(tb[NDA_VLAN]) != sizeof(unsigned short)) { | |
817 | pr_info("bridge: RTM_NEWNEIGH with invalid vlan\n"); | |
818 | return -EINVAL; | |
819 | } | |
820 | ||
821 | vid = nla_get_u16(tb[NDA_VLAN]); | |
822 | ||
8adff41c | 823 | if (!vid || vid >= VLAN_VID_MASK) { |
1690be63 VY |
824 | pr_info("bridge: RTM_NEWNEIGH with invalid vlan id %d\n", |
825 | vid); | |
826 | return -EINVAL; | |
827 | } | |
828 | } | |
36fd2b63 | 829 | p = br_port_get_rtnl(dev); |
830 | if (p == NULL) { | |
831 | pr_info("bridge: RTM_DELNEIGH %s not a bridge port\n", | |
832 | dev->name); | |
833 | return -EINVAL; | |
834 | } | |
835 | ||
1690be63 VY |
836 | pv = nbp_get_vlan_info(p); |
837 | if (vid != VLAN_N_VID) { | |
838 | if (!pv || !test_bit(vid, pv->vlan_bitmap)) { | |
839 | pr_info("bridge: RTM_DELNEIGH with unconfigured " | |
840 | "vlan %d on port %s\n", vid, dev->name); | |
841 | return -EINVAL; | |
842 | } | |
36fd2b63 | 843 | |
1690be63 VY |
844 | err = __br_fdb_delete(p, addr, vid); |
845 | } else { | |
ef40b7ef | 846 | if (!pv || bitmap_empty(pv->vlan_bitmap, VLAN_N_VID)) { |
1690be63 VY |
847 | err = __br_fdb_delete(p, addr, 0); |
848 | goto out; | |
849 | } | |
850 | ||
851 | /* We have vlans configured on this port and user didn't | |
852 | * specify a VLAN. To be nice, add/update entry for every | |
853 | * vlan on this port. | |
854 | */ | |
855 | err = -ENOENT; | |
ef40b7ef | 856 | for_each_set_bit(vid, pv->vlan_bitmap, VLAN_N_VID) { |
1690be63 | 857 | err &= __br_fdb_delete(p, addr, vid); |
1690be63 VY |
858 | } |
859 | } | |
860 | out: | |
36fd2b63 | 861 | return err; |
862 | } |