Blame view
net/bridge/br_fdb.c
17.3 KB
1da177e4c Linux-2.6.12-rc2 |
1 2 3 4 5 6 7 |
/* * Forwarding database * Linux ethernet bridge * * Authors: * Lennert Buytenhek <buytenh@gnu.org> * |
1da177e4c Linux-2.6.12-rc2 |
8 9 10 11 12 13 14 15 |
* This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. */ #include <linux/kernel.h> #include <linux/init.h> |
82524746c rcu: split list.h... |
16 |
#include <linux/rculist.h> |
1da177e4c Linux-2.6.12-rc2 |
17 18 19 20 21 |
#include <linux/spinlock.h> #include <linux/times.h> #include <linux/netdevice.h> #include <linux/etherdevice.h> #include <linux/jhash.h> |
3f8909231 bridge: simpler h... |
22 |
#include <linux/random.h> |
5a0e3ad6a include cleanup: ... |
23 |
#include <linux/slab.h> |
60063497a atomic: use <linu... |
24 |
#include <linux/atomic.h> |
3f8909231 bridge: simpler h... |
25 |
#include <asm/unaligned.h> |
1da177e4c Linux-2.6.12-rc2 |
26 |
#include "br_private.h" |
e18b890bb [PATCH] slab: rem... |
27 |
static struct kmem_cache *br_fdb_cache __read_mostly; |
1da177e4c Linux-2.6.12-rc2 |
28 29 |
static int fdb_insert(struct net_bridge *br, struct net_bridge_port *source, const unsigned char *addr); |
31e8a49c1 bridge: rearrange... |
30 31 |
static void fdb_notify(struct net_bridge *br, const struct net_bridge_fdb_entry *, int); |
1da177e4c Linux-2.6.12-rc2 |
32 |
|
3f8909231 bridge: simpler h... |
33 |
static u32 fdb_salt __read_mostly; |
87a596e0b bridge: check kme... |
34 |
int __init br_fdb_init(void) |
1da177e4c Linux-2.6.12-rc2 |
35 36 37 38 |
{ br_fdb_cache = kmem_cache_create("bridge_fdb_cache", sizeof(struct net_bridge_fdb_entry), 0, |
20c2df83d mm: Remove slab d... |
39 |
SLAB_HWCACHE_ALIGN, NULL); |
87a596e0b bridge: check kme... |
40 41 |
if (!br_fdb_cache) return -ENOMEM; |
3f8909231 bridge: simpler h... |
42 |
get_random_bytes(&fdb_salt, sizeof(fdb_salt)); |
87a596e0b bridge: check kme... |
43 |
return 0; |
1da177e4c Linux-2.6.12-rc2 |
44 |
} |
73afc9069 [BRIDGE]: Section... |
45 |
void br_fdb_fini(void) |
1da177e4c Linux-2.6.12-rc2 |
46 47 48 49 50 51 52 53 |
{ kmem_cache_destroy(br_fdb_cache); } /* if topology_changing then use forward_delay (default 15 sec) * otherwise keep longer (default 5 minutes) */ |
3f8909231 bridge: simpler h... |
54 |
static inline unsigned long hold_time(const struct net_bridge *br) |
1da177e4c Linux-2.6.12-rc2 |
55 56 57 |
{ return br->topology_change ? br->forward_delay : br->ageing_time; } |
3f8909231 bridge: simpler h... |
58 |
static inline int has_expired(const struct net_bridge *br, |
1da177e4c Linux-2.6.12-rc2 |
59 60 |
const struct net_bridge_fdb_entry *fdb) { |
f64f9e719 net: Move && and ... |
61 |
return !fdb->is_static && |
7cd8861ab bridge: track las... |
62 |
time_before_eq(fdb->updated + hold_time(br), jiffies); |
1da177e4c Linux-2.6.12-rc2 |
63 |
} |
3f8909231 bridge: simpler h... |
64 |
static inline int br_mac_hash(const unsigned char *mac) |
1da177e4c Linux-2.6.12-rc2 |
65 |
{ |
3f8909231 bridge: simpler h... |
66 67 68 |
/* use 1 byte of OUI cnd 3 bytes of NIC */ u32 key = get_unaligned((u32 *)(mac + 2)); return jhash_1word(key, fdb_salt) & (BR_HASH_SIZE - 1); |
1da177e4c Linux-2.6.12-rc2 |
69 |
} |
da6782927 bridge: Simplify ... |
70 71 72 73 74 75 |
static void fdb_rcu_free(struct rcu_head *head) { struct net_bridge_fdb_entry *ent = container_of(head, struct net_bridge_fdb_entry, rcu); kmem_cache_free(br_fdb_cache, ent); } |
31e8a49c1 bridge: rearrange... |
76 |
static void fdb_delete(struct net_bridge *br, struct net_bridge_fdb_entry *f) |
1da177e4c Linux-2.6.12-rc2 |
77 78 |
{ hlist_del_rcu(&f->hlist); |
31e8a49c1 bridge: rearrange... |
79 |
fdb_notify(br, f, RTM_DELNEIGH); |
da6782927 bridge: Simplify ... |
80 |
call_rcu(&f->rcu, fdb_rcu_free); |
1da177e4c Linux-2.6.12-rc2 |
81 82 83 84 85 86 |
} void br_fdb_changeaddr(struct net_bridge_port *p, const unsigned char *newaddr) { struct net_bridge *br = p->br; int i; |
9d6f229fc [NET] BRIDGE: Fix... |
87 |
|
1da177e4c Linux-2.6.12-rc2 |
88 89 90 91 92 93 94 95 96 97 98 99 100 |
spin_lock_bh(&br->hash_lock); /* Search all chains since old address/hash is unknown */ for (i = 0; i < BR_HASH_SIZE; i++) { struct hlist_node *h; hlist_for_each(h, &br->hash[i]) { struct net_bridge_fdb_entry *f; f = hlist_entry(h, struct net_bridge_fdb_entry, hlist); if (f->dst == p && f->is_local) { /* maybe another port has same hw addr? */ struct net_bridge_port *op; list_for_each_entry(op, &br->port_list, list) { |
9d6f229fc [NET] BRIDGE: Fix... |
101 |
if (op != p && |
6ede2463c [BRIDGE]: Use eth... |
102 103 |
!compare_ether_addr(op->dev->dev_addr, f->addr.addr)) { |
1da177e4c Linux-2.6.12-rc2 |
104 105 106 107 108 109 |
f->dst = op; goto insert; } } /* delete old one */ |
31e8a49c1 bridge: rearrange... |
110 |
fdb_delete(br, f); |
1da177e4c Linux-2.6.12-rc2 |
111 112 113 114 115 116 117 118 119 120 |
goto insert; } } } insert: /* insert new address, may fail if invalid address or dup. */ fdb_insert(br, p, newaddr); spin_unlock_bh(&br->hash_lock); } |
435988133 bridge: add local... |
121 122 123 124 125 126 127 128 129 130 131 |
void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr) { struct net_bridge_fdb_entry *f; /* If old entry was unassociated with any port, then delete it. */ f = __br_fdb_get(br, br->dev->dev_addr); if (f && f->is_local && !f->dst) fdb_delete(br, f); fdb_insert(br, NULL, newaddr); } |
1da177e4c Linux-2.6.12-rc2 |
132 133 134 135 |
void br_fdb_cleanup(unsigned long _data) { struct net_bridge *br = (struct net_bridge *)_data; unsigned long delay = hold_time(br); |
25442e06d bridge: fdb clean... |
136 |
unsigned long next_timer = jiffies + br->ageing_time; |
1da177e4c Linux-2.6.12-rc2 |
137 138 139 140 141 142 143 144 |
int i; spin_lock_bh(&br->hash_lock); for (i = 0; i < BR_HASH_SIZE; i++) { struct net_bridge_fdb_entry *f; struct hlist_node *h, *n; hlist_for_each_entry_safe(f, h, n, &br->hash[i], hlist) { |
071f77226 [BRIDGE]: Reduce ... |
145 146 147 |
unsigned long this_timer; if (f->is_static) continue; |
7cd8861ab bridge: track las... |
148 |
this_timer = f->updated + delay; |
071f77226 [BRIDGE]: Reduce ... |
149 |
if (time_before_eq(this_timer, jiffies)) |
31e8a49c1 bridge: rearrange... |
150 |
fdb_delete(br, f); |
2bec008ca bridge: use time_... |
151 |
else if (time_before(this_timer, next_timer)) |
071f77226 [BRIDGE]: Reduce ... |
152 |
next_timer = this_timer; |
1da177e4c Linux-2.6.12-rc2 |
153 154 155 |
} } spin_unlock_bh(&br->hash_lock); |
25442e06d bridge: fdb clean... |
156 |
mod_timer(&br->gc_timer, round_jiffies_up(next_timer)); |
1da177e4c Linux-2.6.12-rc2 |
157 |
} |
9cf637473 bridge: add sysfs... |
158 159 160 161 162 163 164 165 166 167 168 |
/* Completely flush all dynamic entries in forwarding database.*/ void br_fdb_flush(struct net_bridge *br) { int i; spin_lock_bh(&br->hash_lock); for (i = 0; i < BR_HASH_SIZE; i++) { struct net_bridge_fdb_entry *f; struct hlist_node *h, *n; hlist_for_each_entry_safe(f, h, n, &br->hash[i], hlist) { if (!f->is_static) |
31e8a49c1 bridge: rearrange... |
169 |
fdb_delete(br, f); |
9cf637473 bridge: add sysfs... |
170 171 172 173 |
} } spin_unlock_bh(&br->hash_lock); } |
1a620698c [BRIDGE]: flush f... |
174 |
|
25985edce Fix common misspe... |
175 |
/* Flush all entries referring to a specific port. |
9cf637473 bridge: add sysfs... |
176 177 |
* if do_all is set also flush static entries */ |
1a620698c [BRIDGE]: flush f... |
178 179 180 |
void br_fdb_delete_by_port(struct net_bridge *br, const struct net_bridge_port *p, int do_all) |
1da177e4c Linux-2.6.12-rc2 |
181 182 183 184 185 186 |
{ int i; spin_lock_bh(&br->hash_lock); for (i = 0; i < BR_HASH_SIZE; i++) { struct hlist_node *h, *g; |
9d6f229fc [NET] BRIDGE: Fix... |
187 |
|
1da177e4c Linux-2.6.12-rc2 |
188 189 190 |
hlist_for_each_safe(h, g, &br->hash[i]) { struct net_bridge_fdb_entry *f = hlist_entry(h, struct net_bridge_fdb_entry, hlist); |
9d6f229fc [NET] BRIDGE: Fix... |
191 |
if (f->dst != p) |
1da177e4c Linux-2.6.12-rc2 |
192 |
continue; |
1a620698c [BRIDGE]: flush f... |
193 194 |
if (f->is_static && !do_all) continue; |
1da177e4c Linux-2.6.12-rc2 |
195 196 197 198 199 200 201 202 |
/* * if multiple ports all have the same device address * then when one port is deleted, assign * the local entry to other port */ if (f->is_local) { struct net_bridge_port *op; list_for_each_entry(op, &br->port_list, list) { |
9d6f229fc [NET] BRIDGE: Fix... |
203 |
if (op != p && |
6ede2463c [BRIDGE]: Use eth... |
204 205 |
!compare_ether_addr(op->dev->dev_addr, f->addr.addr)) { |
1da177e4c Linux-2.6.12-rc2 |
206 207 208 209 210 |
f->dst = op; goto skip_delete; } } } |
31e8a49c1 bridge: rearrange... |
211 |
fdb_delete(br, f); |
1da177e4c Linux-2.6.12-rc2 |
212 213 214 215 216 |
skip_delete: ; } } spin_unlock_bh(&br->hash_lock); } |
eeaf61d88 bridge: add rcu_r... |
217 |
/* No locking or refcounting, assumes caller has rcu_read_lock */ |
1da177e4c Linux-2.6.12-rc2 |
218 219 220 221 222 223 224 |
struct net_bridge_fdb_entry *__br_fdb_get(struct net_bridge *br, const unsigned char *addr) { struct hlist_node *h; struct net_bridge_fdb_entry *fdb; hlist_for_each_entry_rcu(fdb, h, &br->hash[br_mac_hash(addr)], hlist) { |
6ede2463c [BRIDGE]: Use eth... |
225 |
if (!compare_ether_addr(fdb->addr.addr, addr)) { |
1da177e4c Linux-2.6.12-rc2 |
226 227 228 229 230 231 232 233 |
if (unlikely(has_expired(br, fdb))) break; return fdb; } } return NULL; } |
e6373c4c0 net:bridge: use I... |
234 |
#if IS_ENABLED(CONFIG_ATM_LANE) |
da6782927 bridge: Simplify ... |
235 236 237 |
/* Interface used by ATM LANE hook to test * if an addr is on some other bridge port */ int br_fdb_test_addr(struct net_device *dev, unsigned char *addr) |
1da177e4c Linux-2.6.12-rc2 |
238 239 |
{ struct net_bridge_fdb_entry *fdb; |
b5ed54e94 bridge: fix RCU r... |
240 |
struct net_bridge_port *port; |
da6782927 bridge: Simplify ... |
241 |
int ret; |
1da177e4c Linux-2.6.12-rc2 |
242 |
rcu_read_lock(); |
b5ed54e94 bridge: fix RCU r... |
243 244 245 246 247 |
port = br_port_get_rcu(dev); if (!port) ret = 0; else { fdb = __br_fdb_get(port->br, addr); |
435988133 bridge: add local... |
248 |
ret = fdb && fdb->dst && fdb->dst->dev != dev && |
b5ed54e94 bridge: fix RCU r... |
249 250 |
fdb->dst->state == BR_STATE_FORWARDING; } |
1da177e4c Linux-2.6.12-rc2 |
251 |
rcu_read_unlock(); |
1da177e4c Linux-2.6.12-rc2 |
252 |
|
da6782927 bridge: Simplify ... |
253 |
return ret; |
1da177e4c Linux-2.6.12-rc2 |
254 |
} |
da6782927 bridge: Simplify ... |
255 |
#endif /* CONFIG_ATM_LANE */ |
1da177e4c Linux-2.6.12-rc2 |
256 257 |
/* |
9d6f229fc [NET] BRIDGE: Fix... |
258 |
* Fill buffer with forwarding table records in |
1da177e4c Linux-2.6.12-rc2 |
259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 |
* the API format. */ int br_fdb_fillbuf(struct net_bridge *br, void *buf, unsigned long maxnum, unsigned long skip) { struct __fdb_entry *fe = buf; int i, num = 0; struct hlist_node *h; struct net_bridge_fdb_entry *f; memset(buf, 0, maxnum*sizeof(struct __fdb_entry)); rcu_read_lock(); for (i = 0; i < BR_HASH_SIZE; i++) { hlist_for_each_entry_rcu(f, h, &br->hash[i], hlist) { if (num >= maxnum) goto out; |
9d6f229fc [NET] BRIDGE: Fix... |
276 |
if (has_expired(br, f)) |
1da177e4c Linux-2.6.12-rc2 |
277 |
continue; |
435988133 bridge: add local... |
278 279 280 |
/* ignore pseudo entry for local MAC address */ if (!f->dst) continue; |
1da177e4c Linux-2.6.12-rc2 |
281 282 283 284 285 286 287 |
if (skip) { --skip; continue; } /* convert from internal format to API */ memcpy(fe->mac_addr, f->addr.addr, ETH_ALEN); |
ae4f8fca4 bridge: forwardin... |
288 289 |
/* due to ABI compat need to split into hi/lo */ |
1da177e4c Linux-2.6.12-rc2 |
290 |
fe->port_no = f->dst->port_no; |
ae4f8fca4 bridge: forwardin... |
291 |
fe->port_hi = f->dst->port_no >> 8; |
1da177e4c Linux-2.6.12-rc2 |
292 293 |
fe->is_local = f->is_local; if (!f->is_static) |
7cd8861ab bridge: track las... |
294 |
fe->ageing_timer_value = jiffies_to_clock_t(jiffies - f->updated); |
1da177e4c Linux-2.6.12-rc2 |
295 296 297 298 299 300 301 302 303 304 |
++fe; ++num; } } out: rcu_read_unlock(); return num; } |
664de48bb bridge: split rcu... |
305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 |
static struct net_bridge_fdb_entry *fdb_find(struct hlist_head *head, const unsigned char *addr) { struct hlist_node *h; struct net_bridge_fdb_entry *fdb; hlist_for_each_entry(fdb, h, head, hlist) { if (!compare_ether_addr(fdb->addr.addr, addr)) return fdb; } return NULL; } static struct net_bridge_fdb_entry *fdb_find_rcu(struct hlist_head *head, const unsigned char *addr) |
1da177e4c Linux-2.6.12-rc2 |
320 321 322 323 324 |
{ struct hlist_node *h; struct net_bridge_fdb_entry *fdb; hlist_for_each_entry_rcu(fdb, h, head, hlist) { |
6ede2463c [BRIDGE]: Use eth... |
325 |
if (!compare_ether_addr(fdb->addr.addr, addr)) |
1da177e4c Linux-2.6.12-rc2 |
326 327 328 329 330 331 332 |
return fdb; } return NULL; } static struct net_bridge_fdb_entry *fdb_create(struct hlist_head *head, struct net_bridge_port *source, |
03e9b64b8 bridge: change ar... |
333 |
const unsigned char *addr) |
1da177e4c Linux-2.6.12-rc2 |
334 335 336 337 338 339 |
{ struct net_bridge_fdb_entry *fdb; fdb = kmem_cache_alloc(br_fdb_cache, GFP_ATOMIC); if (fdb) { memcpy(fdb->addr.addr, addr, ETH_ALEN); |
1da177e4c Linux-2.6.12-rc2 |
340 |
fdb->dst = source; |
03e9b64b8 bridge: change ar... |
341 342 |
fdb->is_local = 0; fdb->is_static = 0; |
7cd8861ab bridge: track las... |
343 |
fdb->updated = fdb->used = jiffies; |
1158f762e bridge: Don't put... |
344 |
hlist_add_head_rcu(&fdb->hlist, head); |
1da177e4c Linux-2.6.12-rc2 |
345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 |
} return fdb; } static int fdb_insert(struct net_bridge *br, struct net_bridge_port *source, const unsigned char *addr) { struct hlist_head *head = &br->hash[br_mac_hash(addr)]; struct net_bridge_fdb_entry *fdb; if (!is_valid_ether_addr(addr)) return -EINVAL; fdb = fdb_find(head, addr); if (fdb) { |
9d6f229fc [NET] BRIDGE: Fix... |
360 |
/* it is okay to have multiple ports with same |
1da177e4c Linux-2.6.12-rc2 |
361 362 |
* address, just use the first one. */ |
9d6f229fc [NET] BRIDGE: Fix... |
363 |
if (fdb->is_local) |
1da177e4c Linux-2.6.12-rc2 |
364 |
return 0; |
28a16c979 bridge: change co... |
365 |
br_warn(br, "adding interface %s with same address " |
1da177e4c Linux-2.6.12-rc2 |
366 367 368 |
"as a received packet ", source->dev->name); |
31e8a49c1 bridge: rearrange... |
369 |
fdb_delete(br, fdb); |
9d6f229fc [NET] BRIDGE: Fix... |
370 |
} |
1da177e4c Linux-2.6.12-rc2 |
371 |
|
03e9b64b8 bridge: change ar... |
372 373 |
fdb = fdb_create(head, source, addr); if (!fdb) |
1da177e4c Linux-2.6.12-rc2 |
374 |
return -ENOMEM; |
03e9b64b8 bridge: change ar... |
375 |
fdb->is_local = fdb->is_static = 1; |
31e8a49c1 bridge: rearrange... |
376 |
fdb_notify(br, fdb, RTM_NEWNEIGH); |
1da177e4c Linux-2.6.12-rc2 |
377 378 |
return 0; } |
03e9b64b8 bridge: change ar... |
379 |
/* Add entry for local address of interface */ |
1da177e4c Linux-2.6.12-rc2 |
380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 |
int br_fdb_insert(struct net_bridge *br, struct net_bridge_port *source, const unsigned char *addr) { int ret; spin_lock_bh(&br->hash_lock); ret = fdb_insert(br, source, addr); spin_unlock_bh(&br->hash_lock); return ret; } void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source, const unsigned char *addr) { struct hlist_head *head = &br->hash[br_mac_hash(addr)]; struct net_bridge_fdb_entry *fdb; /* some users want to always flood. */ if (hold_time(br) == 0) return; |
df1c0b846 [BRIDGE]: Packets... |
400 401 402 403 |
/* ignore packets unless we are using this port */ if (!(source->state == BR_STATE_LEARNING || source->state == BR_STATE_FORWARDING)) return; |
664de48bb bridge: split rcu... |
404 |
fdb = fdb_find_rcu(head, addr); |
1da177e4c Linux-2.6.12-rc2 |
405 406 407 |
if (likely(fdb)) { /* attempt to update an entry for a local interface */ if (unlikely(fdb->is_local)) { |
9d6f229fc [NET] BRIDGE: Fix... |
408 |
if (net_ratelimit()) |
28a16c979 bridge: change co... |
409 410 411 412 |
br_warn(br, "received packet on %s with " "own address as source address ", source->dev->name); |
1da177e4c Linux-2.6.12-rc2 |
413 414 415 |
} else { /* fastpath: update of existing entry */ fdb->dst = source; |
7cd8861ab bridge: track las... |
416 |
fdb->updated = jiffies; |
1da177e4c Linux-2.6.12-rc2 |
417 418 |
} } else { |
f8ae737de [BRIDGE]: forward... |
419 |
spin_lock(&br->hash_lock); |
f58ee4e1a bridge: refactor ... |
420 421 422 |
if (likely(!fdb_find(head, addr))) { fdb = fdb_create(head, source, addr); if (fdb) |
31e8a49c1 bridge: rearrange... |
423 |
fdb_notify(br, fdb, RTM_NEWNEIGH); |
f58ee4e1a bridge: refactor ... |
424 |
} |
1da177e4c Linux-2.6.12-rc2 |
425 426 427 |
/* else we lose race and someone else inserts * it first, don't bother updating */ |
f8ae737de [BRIDGE]: forward... |
428 |
spin_unlock(&br->hash_lock); |
1da177e4c Linux-2.6.12-rc2 |
429 |
} |
1da177e4c Linux-2.6.12-rc2 |
430 |
} |
b078f0df6 bridge: add netli... |
431 432 433 434 435 436 437 438 439 440 441 442 |
static int fdb_to_nud(const struct net_bridge_fdb_entry *fdb) { if (fdb->is_local) return NUD_PERMANENT; else if (fdb->is_static) return NUD_NOARP; else if (has_expired(fdb->dst->br, fdb)) return NUD_STALE; else return NUD_REACHABLE; } |
31e8a49c1 bridge: rearrange... |
443 |
static int fdb_fill_info(struct sk_buff *skb, const struct net_bridge *br, |
b078f0df6 bridge: add netli... |
444 445 446 447 448 449 450 451 452 453 454 |
const struct net_bridge_fdb_entry *fdb, u32 pid, u32 seq, int type, unsigned int flags) { unsigned long now = jiffies; struct nda_cacheinfo ci; struct nlmsghdr *nlh; struct ndmsg *ndm; nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), flags); if (nlh == NULL) return -EMSGSIZE; |
b078f0df6 bridge: add netli... |
455 456 457 458 459 460 |
ndm = nlmsg_data(nlh); ndm->ndm_family = AF_BRIDGE; ndm->ndm_pad1 = 0; ndm->ndm_pad2 = 0; ndm->ndm_flags = 0; ndm->ndm_type = 0; |
435988133 bridge: add local... |
461 |
ndm->ndm_ifindex = fdb->dst ? fdb->dst->dev->ifindex : br->dev->ifindex; |
b078f0df6 bridge: add netli... |
462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 |
ndm->ndm_state = fdb_to_nud(fdb); NLA_PUT(skb, NDA_LLADDR, ETH_ALEN, &fdb->addr); ci.ndm_used = jiffies_to_clock_t(now - fdb->used); ci.ndm_confirmed = 0; ci.ndm_updated = jiffies_to_clock_t(now - fdb->updated); ci.ndm_refcnt = 0; NLA_PUT(skb, NDA_CACHEINFO, sizeof(ci), &ci); return nlmsg_end(skb, nlh); nla_put_failure: nlmsg_cancel(skb, nlh); return -EMSGSIZE; } static inline size_t fdb_nlmsg_size(void) { return NLMSG_ALIGN(sizeof(struct ndmsg)) + nla_total_size(ETH_ALEN) /* NDA_LLADDR */ + nla_total_size(sizeof(struct nda_cacheinfo)); } |
31e8a49c1 bridge: rearrange... |
485 486 |
static void fdb_notify(struct net_bridge *br, const struct net_bridge_fdb_entry *fdb, int type) |
b078f0df6 bridge: add netli... |
487 |
{ |
31e8a49c1 bridge: rearrange... |
488 |
struct net *net = dev_net(br->dev); |
b078f0df6 bridge: add netli... |
489 490 491 492 493 494 |
struct sk_buff *skb; int err = -ENOBUFS; skb = nlmsg_new(fdb_nlmsg_size(), GFP_ATOMIC); if (skb == NULL) goto errout; |
31e8a49c1 bridge: rearrange... |
495 |
err = fdb_fill_info(skb, br, fdb, 0, 0, type, 0); |
b078f0df6 bridge: add netli... |
496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 |
if (err < 0) { /* -EMSGSIZE implies BUG in fdb_nlmsg_size() */ WARN_ON(err == -EMSGSIZE); kfree_skb(skb); goto errout; } rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC); return; errout: if (err < 0) rtnl_set_sk_err(net, RTNLGRP_NEIGH, err); } /* Dump information about entries, in response to GETNEIGH */ int br_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb) { struct net *net = sock_net(skb->sk); struct net_device *dev; int idx = 0; rcu_read_lock(); for_each_netdev_rcu(net, dev) { struct net_bridge *br = netdev_priv(dev); int i; if (!(dev->priv_flags & IFF_EBRIDGE)) continue; for (i = 0; i < BR_HASH_SIZE; i++) { struct hlist_node *h; struct net_bridge_fdb_entry *f; hlist_for_each_entry_rcu(f, h, &br->hash[i], hlist) { if (idx < cb->args[0]) goto skip; |
31e8a49c1 bridge: rearrange... |
531 |
if (fdb_fill_info(skb, br, f, |
b078f0df6 bridge: add netli... |
532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 |
NETLINK_CB(cb->skb).pid, cb->nlh->nlmsg_seq, RTM_NEWNEIGH, NLM_F_MULTI) < 0) break; skip: ++idx; } } } rcu_read_unlock(); cb->args[0] = idx; return skb->len; } |
36fd2b63e bridge: allow cre... |
548 |
|
292d13989 bridge: add NTF_U... |
549 |
/* Update (create or replace) forwarding database entry */ |
36fd2b63e bridge: allow cre... |
550 |
static int fdb_add_entry(struct net_bridge_port *source, const __u8 *addr, |
64af1bac9 bridge: allow upd... |
551 |
__u16 state, __u16 flags) |
36fd2b63e bridge: allow cre... |
552 553 554 555 556 557 |
{ struct net_bridge *br = source->br; struct hlist_head *head = &br->hash[br_mac_hash(addr)]; struct net_bridge_fdb_entry *fdb; fdb = fdb_find(head, addr); |
64af1bac9 bridge: allow upd... |
558 559 560 |
if (fdb == NULL) { if (!(flags & NLM_F_CREATE)) return -ENOENT; |
36fd2b63e bridge: allow cre... |
561 |
|
64af1bac9 bridge: allow upd... |
562 563 564 |
fdb = fdb_create(head, source, addr); if (!fdb) return -ENOMEM; |
31e8a49c1 bridge: rearrange... |
565 |
fdb_notify(br, fdb, RTM_NEWNEIGH); |
64af1bac9 bridge: allow upd... |
566 567 568 |
} else { if (flags & NLM_F_EXCL) return -EEXIST; |
292d13989 bridge: add NTF_U... |
569 570 571 572 573 574 575 576 577 578 |
} if (fdb_to_nud(fdb) != state) { if (state & NUD_PERMANENT) fdb->is_local = fdb->is_static = 1; else if (state & NUD_NOARP) { fdb->is_local = 0; fdb->is_static = 1; } else fdb->is_local = fdb->is_static = 0; |
64af1bac9 bridge: allow upd... |
579 |
|
292d13989 bridge: add NTF_U... |
580 |
fdb->updated = fdb->used = jiffies; |
31e8a49c1 bridge: rearrange... |
581 |
fdb_notify(br, fdb, RTM_NEWNEIGH); |
64af1bac9 bridge: allow upd... |
582 |
} |
36fd2b63e bridge: allow cre... |
583 |
|
36fd2b63e bridge: allow cre... |
584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 |
return 0; } /* Add new permanent fdb entry with RTM_NEWNEIGH */ int br_fdb_add(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) { struct net *net = sock_net(skb->sk); struct ndmsg *ndm; struct nlattr *tb[NDA_MAX+1]; struct net_device *dev; struct net_bridge_port *p; const __u8 *addr; int err; ASSERT_RTNL(); err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL); if (err < 0) return err; ndm = nlmsg_data(nlh); if (ndm->ndm_ifindex == 0) { pr_info("bridge: RTM_NEWNEIGH with invalid ifindex "); return -EINVAL; } dev = __dev_get_by_index(net, ndm->ndm_ifindex); if (dev == NULL) { pr_info("bridge: RTM_NEWNEIGH with unknown ifindex "); return -ENODEV; } if (!tb[NDA_LLADDR] || nla_len(tb[NDA_LLADDR]) != ETH_ALEN) { pr_info("bridge: RTM_NEWNEIGH with invalid address "); return -EINVAL; } addr = nla_data(tb[NDA_LLADDR]); if (!is_valid_ether_addr(addr)) { pr_info("bridge: RTM_NEWNEIGH with invalid ether address "); return -EINVAL; } |
292d13989 bridge: add NTF_U... |
629 630 631 632 633 |
if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_NOARP|NUD_REACHABLE))) { pr_info("bridge: RTM_NEWNEIGH with invalid state %#x ", ndm->ndm_state); return -EINVAL; } |
36fd2b63e bridge: allow cre... |
634 635 636 637 638 639 640 |
p = br_port_get_rtnl(dev); if (p == NULL) { pr_info("bridge: RTM_NEWNEIGH %s not a bridge port ", dev->name); return -EINVAL; } |
292d13989 bridge: add NTF_U... |
641 642 643 644 645 646 647 648 649 |
if (ndm->ndm_flags & NTF_USE) { rcu_read_lock(); br_fdb_update(p->br, p, addr); rcu_read_unlock(); } else { spin_lock_bh(&p->br->hash_lock); err = fdb_add_entry(p, addr, ndm->ndm_state, nlh->nlmsg_flags); spin_unlock_bh(&p->br->hash_lock); } |
36fd2b63e bridge: allow cre... |
650 651 652 653 654 655 656 657 658 659 660 661 662 |
return err; } static int fdb_delete_by_addr(struct net_bridge_port *p, const u8 *addr) { struct net_bridge *br = p->br; struct hlist_head *head = &br->hash[br_mac_hash(addr)]; struct net_bridge_fdb_entry *fdb; fdb = fdb_find(head, addr); if (!fdb) return -ENOENT; |
31e8a49c1 bridge: rearrange... |
663 |
fdb_delete(p->br, fdb); |
36fd2b63e bridge: allow cre... |
664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 |
return 0; } /* Remove neighbor entry with RTM_DELNEIGH */ int br_fdb_delete(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) { struct net *net = sock_net(skb->sk); struct ndmsg *ndm; struct net_bridge_port *p; struct nlattr *llattr; const __u8 *addr; struct net_device *dev; int err; ASSERT_RTNL(); if (nlmsg_len(nlh) < sizeof(*ndm)) return -EINVAL; ndm = nlmsg_data(nlh); if (ndm->ndm_ifindex == 0) { pr_info("bridge: RTM_DELNEIGH with invalid ifindex "); return -EINVAL; } dev = __dev_get_by_index(net, ndm->ndm_ifindex); if (dev == NULL) { pr_info("bridge: RTM_DELNEIGH with unknown ifindex "); return -ENODEV; } llattr = nlmsg_find_attr(nlh, sizeof(*ndm), NDA_LLADDR); if (llattr == NULL || nla_len(llattr) != ETH_ALEN) { pr_info("bridge: RTM_DELNEIGH with invalid address "); return -EINVAL; } addr = nla_data(llattr); p = br_port_get_rtnl(dev); if (p == NULL) { pr_info("bridge: RTM_DELNEIGH %s not a bridge port ", dev->name); return -EINVAL; } spin_lock_bh(&p->br->hash_lock); err = fdb_delete_by_addr(p, addr); spin_unlock_bh(&p->br->hash_lock); return err; } |