Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Generic address resolution entity |
| 3 | * |
| 4 | * Authors: |
| 5 | * Pedro Roque <roque@di.fc.ul.pt> |
| 6 | * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> |
| 7 | * |
| 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 | * Fixes: |
| 14 | * Vitaly E. Lavrov releasing NULL neighbor in neigh_add. |
| 15 | * Harald Welte Add neighbour cache statistics like rtstat |
| 16 | */ |
| 17 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | #include <linux/types.h> |
| 19 | #include <linux/kernel.h> |
| 20 | #include <linux/module.h> |
| 21 | #include <linux/socket.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | #include <linux/netdevice.h> |
| 23 | #include <linux/proc_fs.h> |
| 24 | #ifdef CONFIG_SYSCTL |
| 25 | #include <linux/sysctl.h> |
| 26 | #endif |
| 27 | #include <linux/times.h> |
Eric W. Biederman | 457c4cb | 2007-09-12 12:01:34 +0200 | [diff] [blame] | 28 | #include <net/net_namespace.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | #include <net/neighbour.h> |
| 30 | #include <net/dst.h> |
| 31 | #include <net/sock.h> |
Tom Tucker | 8d71740 | 2006-07-30 20:43:36 -0700 | [diff] [blame] | 32 | #include <net/netevent.h> |
Thomas Graf | a14a49d | 2006-08-07 17:53:08 -0700 | [diff] [blame] | 33 | #include <net/netlink.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | #include <linux/rtnetlink.h> |
| 35 | #include <linux/random.h> |
Paulo Marques | 543537b | 2005-06-23 00:09:02 -0700 | [diff] [blame] | 36 | #include <linux/string.h> |
vignesh babu | c3609d5 | 2007-08-24 22:27:55 -0700 | [diff] [blame] | 37 | #include <linux/log2.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | |
| 39 | #define NEIGH_DEBUG 1 |
| 40 | |
| 41 | #define NEIGH_PRINTK(x...) printk(x) |
| 42 | #define NEIGH_NOPRINTK(x...) do { ; } while(0) |
| 43 | #define NEIGH_PRINTK0 NEIGH_PRINTK |
| 44 | #define NEIGH_PRINTK1 NEIGH_NOPRINTK |
| 45 | #define NEIGH_PRINTK2 NEIGH_NOPRINTK |
| 46 | |
| 47 | #if NEIGH_DEBUG >= 1 |
| 48 | #undef NEIGH_PRINTK1 |
| 49 | #define NEIGH_PRINTK1 NEIGH_PRINTK |
| 50 | #endif |
| 51 | #if NEIGH_DEBUG >= 2 |
| 52 | #undef NEIGH_PRINTK2 |
| 53 | #define NEIGH_PRINTK2 NEIGH_PRINTK |
| 54 | #endif |
| 55 | |
| 56 | #define PNEIGH_HASHMASK 0xF |
| 57 | |
| 58 | static void neigh_timer_handler(unsigned long arg); |
Thomas Graf | d961db3 | 2007-08-08 23:12:56 -0700 | [diff] [blame] | 59 | static void __neigh_notify(struct neighbour *n, int type, int flags); |
| 60 | static void neigh_update_notify(struct neighbour *neigh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | static int pneigh_ifdown(struct neigh_table *tbl, struct net_device *dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 62 | |
| 63 | static struct neigh_table *neigh_tables; |
Amos Waterland | 45fc3b1 | 2005-09-24 16:53:16 -0700 | [diff] [blame] | 64 | #ifdef CONFIG_PROC_FS |
Arjan van de Ven | 9a32144 | 2007-02-12 00:55:35 -0800 | [diff] [blame] | 65 | static const struct file_operations neigh_stat_seq_fops; |
Amos Waterland | 45fc3b1 | 2005-09-24 16:53:16 -0700 | [diff] [blame] | 66 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 67 | |
| 68 | /* |
| 69 | Neighbour hash table buckets are protected with rwlock tbl->lock. |
| 70 | |
| 71 | - All the scans/updates to hash buckets MUST be made under this lock. |
| 72 | - NOTHING clever should be made under this lock: no callbacks |
| 73 | to protocol backends, no attempts to send something to network. |
| 74 | It will result in deadlocks, if backend/driver wants to use neighbour |
| 75 | cache. |
| 76 | - If the entry requires some non-trivial actions, increase |
| 77 | its reference count and release table lock. |
| 78 | |
| 79 | Neighbour entries are protected: |
| 80 | - with reference count. |
| 81 | - with rwlock neigh->lock |
| 82 | |
| 83 | Reference count prevents destruction. |
| 84 | |
| 85 | neigh->lock mainly serializes ll address data and its validity state. |
| 86 | However, the same lock is used to protect another entry fields: |
| 87 | - timer |
| 88 | - resolution queue |
| 89 | |
| 90 | Again, nothing clever shall be made under neigh->lock, |
| 91 | the most complicated procedure, which we allow is dev->hard_header. |
| 92 | It is supposed, that dev->hard_header is simplistic and does |
| 93 | not make callbacks to neighbour tables. |
| 94 | |
| 95 | The last lock is neigh_tbl_lock. It is pure SMP lock, protecting |
| 96 | list of neighbour tables. This list is used only in process context, |
| 97 | */ |
| 98 | |
| 99 | static DEFINE_RWLOCK(neigh_tbl_lock); |
| 100 | |
| 101 | static int neigh_blackhole(struct sk_buff *skb) |
| 102 | { |
| 103 | kfree_skb(skb); |
| 104 | return -ENETDOWN; |
| 105 | } |
| 106 | |
Thomas Graf | 4f49455 | 2007-08-08 23:12:36 -0700 | [diff] [blame] | 107 | static void neigh_cleanup_and_release(struct neighbour *neigh) |
| 108 | { |
| 109 | if (neigh->parms->neigh_cleanup) |
| 110 | neigh->parms->neigh_cleanup(neigh); |
| 111 | |
Thomas Graf | d961db3 | 2007-08-08 23:12:56 -0700 | [diff] [blame] | 112 | __neigh_notify(neigh, RTM_DELNEIGH, 0); |
Thomas Graf | 4f49455 | 2007-08-08 23:12:36 -0700 | [diff] [blame] | 113 | neigh_release(neigh); |
| 114 | } |
| 115 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 116 | /* |
| 117 | * It is random distribution in the interval (1/2)*base...(3/2)*base. |
| 118 | * It corresponds to default IPv6 settings and is not overridable, |
| 119 | * because it is really reasonable choice. |
| 120 | */ |
| 121 | |
| 122 | unsigned long neigh_rand_reach_time(unsigned long base) |
| 123 | { |
| 124 | return (base ? (net_random() % base) + (base >> 1) : 0); |
| 125 | } |
| 126 | |
| 127 | |
| 128 | static int neigh_forced_gc(struct neigh_table *tbl) |
| 129 | { |
| 130 | int shrunk = 0; |
| 131 | int i; |
| 132 | |
| 133 | NEIGH_CACHE_STAT_INC(tbl, forced_gc_runs); |
| 134 | |
| 135 | write_lock_bh(&tbl->lock); |
| 136 | for (i = 0; i <= tbl->hash_mask; i++) { |
| 137 | struct neighbour *n, **np; |
| 138 | |
| 139 | np = &tbl->hash_buckets[i]; |
| 140 | while ((n = *np) != NULL) { |
| 141 | /* Neighbour record may be discarded if: |
| 142 | * - nobody refers to it. |
| 143 | * - it is not permanent |
| 144 | */ |
| 145 | write_lock(&n->lock); |
| 146 | if (atomic_read(&n->refcnt) == 1 && |
| 147 | !(n->nud_state & NUD_PERMANENT)) { |
| 148 | *np = n->next; |
| 149 | n->dead = 1; |
| 150 | shrunk = 1; |
| 151 | write_unlock(&n->lock); |
Thomas Graf | 4f49455 | 2007-08-08 23:12:36 -0700 | [diff] [blame] | 152 | neigh_cleanup_and_release(n); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 153 | continue; |
| 154 | } |
| 155 | write_unlock(&n->lock); |
| 156 | np = &n->next; |
| 157 | } |
| 158 | } |
| 159 | |
| 160 | tbl->last_flush = jiffies; |
| 161 | |
| 162 | write_unlock_bh(&tbl->lock); |
| 163 | |
| 164 | return shrunk; |
| 165 | } |
| 166 | |
Pavel Emelyanov | a43d899 | 2007-12-20 15:49:05 -0800 | [diff] [blame] | 167 | static void neigh_add_timer(struct neighbour *n, unsigned long when) |
| 168 | { |
| 169 | neigh_hold(n); |
| 170 | if (unlikely(mod_timer(&n->timer, when))) { |
| 171 | printk("NEIGH: BUG, double timer add, state is %x\n", |
| 172 | n->nud_state); |
| 173 | dump_stack(); |
| 174 | } |
| 175 | } |
| 176 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 177 | static int neigh_del_timer(struct neighbour *n) |
| 178 | { |
| 179 | if ((n->nud_state & NUD_IN_TIMER) && |
| 180 | del_timer(&n->timer)) { |
| 181 | neigh_release(n); |
| 182 | return 1; |
| 183 | } |
| 184 | return 0; |
| 185 | } |
| 186 | |
| 187 | static void pneigh_queue_purge(struct sk_buff_head *list) |
| 188 | { |
| 189 | struct sk_buff *skb; |
| 190 | |
| 191 | while ((skb = skb_dequeue(list)) != NULL) { |
| 192 | dev_put(skb->dev); |
| 193 | kfree_skb(skb); |
| 194 | } |
| 195 | } |
| 196 | |
Herbert Xu | 49636bb | 2005-10-23 17:18:00 +1000 | [diff] [blame] | 197 | static void neigh_flush_dev(struct neigh_table *tbl, struct net_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 198 | { |
| 199 | int i; |
| 200 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 201 | for (i = 0; i <= tbl->hash_mask; i++) { |
| 202 | struct neighbour *n, **np = &tbl->hash_buckets[i]; |
| 203 | |
| 204 | while ((n = *np) != NULL) { |
| 205 | if (dev && n->dev != dev) { |
| 206 | np = &n->next; |
| 207 | continue; |
| 208 | } |
| 209 | *np = n->next; |
| 210 | write_lock(&n->lock); |
| 211 | neigh_del_timer(n); |
| 212 | n->dead = 1; |
| 213 | |
| 214 | if (atomic_read(&n->refcnt) != 1) { |
| 215 | /* The most unpleasant situation. |
| 216 | We must destroy neighbour entry, |
| 217 | but someone still uses it. |
| 218 | |
| 219 | The destroy will be delayed until |
| 220 | the last user releases us, but |
| 221 | we must kill timers etc. and move |
| 222 | it to safe state. |
| 223 | */ |
| 224 | skb_queue_purge(&n->arp_queue); |
| 225 | n->output = neigh_blackhole; |
| 226 | if (n->nud_state & NUD_VALID) |
| 227 | n->nud_state = NUD_NOARP; |
| 228 | else |
| 229 | n->nud_state = NUD_NONE; |
| 230 | NEIGH_PRINTK2("neigh %p is stray.\n", n); |
| 231 | } |
| 232 | write_unlock(&n->lock); |
Thomas Graf | 4f49455 | 2007-08-08 23:12:36 -0700 | [diff] [blame] | 233 | neigh_cleanup_and_release(n); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 234 | } |
| 235 | } |
Herbert Xu | 49636bb | 2005-10-23 17:18:00 +1000 | [diff] [blame] | 236 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 237 | |
Herbert Xu | 49636bb | 2005-10-23 17:18:00 +1000 | [diff] [blame] | 238 | void neigh_changeaddr(struct neigh_table *tbl, struct net_device *dev) |
| 239 | { |
| 240 | write_lock_bh(&tbl->lock); |
| 241 | neigh_flush_dev(tbl, dev); |
| 242 | write_unlock_bh(&tbl->lock); |
| 243 | } |
| 244 | |
| 245 | int neigh_ifdown(struct neigh_table *tbl, struct net_device *dev) |
| 246 | { |
| 247 | write_lock_bh(&tbl->lock); |
| 248 | neigh_flush_dev(tbl, dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 249 | pneigh_ifdown(tbl, dev); |
| 250 | write_unlock_bh(&tbl->lock); |
| 251 | |
| 252 | del_timer_sync(&tbl->proxy_timer); |
| 253 | pneigh_queue_purge(&tbl->proxy_queue); |
| 254 | return 0; |
| 255 | } |
| 256 | |
| 257 | static struct neighbour *neigh_alloc(struct neigh_table *tbl) |
| 258 | { |
| 259 | struct neighbour *n = NULL; |
| 260 | unsigned long now = jiffies; |
| 261 | int entries; |
| 262 | |
| 263 | entries = atomic_inc_return(&tbl->entries) - 1; |
| 264 | if (entries >= tbl->gc_thresh3 || |
| 265 | (entries >= tbl->gc_thresh2 && |
| 266 | time_after(now, tbl->last_flush + 5 * HZ))) { |
| 267 | if (!neigh_forced_gc(tbl) && |
| 268 | entries >= tbl->gc_thresh3) |
| 269 | goto out_entries; |
| 270 | } |
| 271 | |
Robert P. J. Day | c376222 | 2007-02-10 01:45:03 -0800 | [diff] [blame] | 272 | n = kmem_cache_zalloc(tbl->kmem_cachep, GFP_ATOMIC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 273 | if (!n) |
| 274 | goto out_entries; |
| 275 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 276 | skb_queue_head_init(&n->arp_queue); |
| 277 | rwlock_init(&n->lock); |
| 278 | n->updated = n->used = now; |
| 279 | n->nud_state = NUD_NONE; |
| 280 | n->output = neigh_blackhole; |
| 281 | n->parms = neigh_parms_clone(&tbl->parms); |
Pavel Emelyanov | b24b8a2 | 2008-01-23 21:20:07 -0800 | [diff] [blame] | 282 | setup_timer(&n->timer, neigh_timer_handler, (unsigned long)n); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 283 | |
| 284 | NEIGH_CACHE_STAT_INC(tbl, allocs); |
| 285 | n->tbl = tbl; |
| 286 | atomic_set(&n->refcnt, 1); |
| 287 | n->dead = 1; |
| 288 | out: |
| 289 | return n; |
| 290 | |
| 291 | out_entries: |
| 292 | atomic_dec(&tbl->entries); |
| 293 | goto out; |
| 294 | } |
| 295 | |
| 296 | static struct neighbour **neigh_hash_alloc(unsigned int entries) |
| 297 | { |
| 298 | unsigned long size = entries * sizeof(struct neighbour *); |
| 299 | struct neighbour **ret; |
| 300 | |
| 301 | if (size <= PAGE_SIZE) { |
Andrew Morton | 77d04bd | 2006-04-07 14:52:59 -0700 | [diff] [blame] | 302 | ret = kzalloc(size, GFP_ATOMIC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 303 | } else { |
| 304 | ret = (struct neighbour **) |
Andrew Morton | 77d04bd | 2006-04-07 14:52:59 -0700 | [diff] [blame] | 305 | __get_free_pages(GFP_ATOMIC|__GFP_ZERO, get_order(size)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 306 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 307 | return ret; |
| 308 | } |
| 309 | |
| 310 | static void neigh_hash_free(struct neighbour **hash, unsigned int entries) |
| 311 | { |
| 312 | unsigned long size = entries * sizeof(struct neighbour *); |
| 313 | |
| 314 | if (size <= PAGE_SIZE) |
| 315 | kfree(hash); |
| 316 | else |
| 317 | free_pages((unsigned long)hash, get_order(size)); |
| 318 | } |
| 319 | |
| 320 | static void neigh_hash_grow(struct neigh_table *tbl, unsigned long new_entries) |
| 321 | { |
| 322 | struct neighbour **new_hash, **old_hash; |
| 323 | unsigned int i, new_hash_mask, old_entries; |
| 324 | |
| 325 | NEIGH_CACHE_STAT_INC(tbl, hash_grows); |
| 326 | |
vignesh babu | c3609d5 | 2007-08-24 22:27:55 -0700 | [diff] [blame] | 327 | BUG_ON(!is_power_of_2(new_entries)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 328 | new_hash = neigh_hash_alloc(new_entries); |
| 329 | if (!new_hash) |
| 330 | return; |
| 331 | |
| 332 | old_entries = tbl->hash_mask + 1; |
| 333 | new_hash_mask = new_entries - 1; |
| 334 | old_hash = tbl->hash_buckets; |
| 335 | |
| 336 | get_random_bytes(&tbl->hash_rnd, sizeof(tbl->hash_rnd)); |
| 337 | for (i = 0; i < old_entries; i++) { |
| 338 | struct neighbour *n, *next; |
| 339 | |
| 340 | for (n = old_hash[i]; n; n = next) { |
| 341 | unsigned int hash_val = tbl->hash(n->primary_key, n->dev); |
| 342 | |
| 343 | hash_val &= new_hash_mask; |
| 344 | next = n->next; |
| 345 | |
| 346 | n->next = new_hash[hash_val]; |
| 347 | new_hash[hash_val] = n; |
| 348 | } |
| 349 | } |
| 350 | tbl->hash_buckets = new_hash; |
| 351 | tbl->hash_mask = new_hash_mask; |
| 352 | |
| 353 | neigh_hash_free(old_hash, old_entries); |
| 354 | } |
| 355 | |
| 356 | struct neighbour *neigh_lookup(struct neigh_table *tbl, const void *pkey, |
| 357 | struct net_device *dev) |
| 358 | { |
| 359 | struct neighbour *n; |
| 360 | int key_len = tbl->key_len; |
Julian Anastasov | c5e2946 | 2006-10-03 15:49:46 -0700 | [diff] [blame] | 361 | u32 hash_val = tbl->hash(pkey, dev); |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 362 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 363 | NEIGH_CACHE_STAT_INC(tbl, lookups); |
| 364 | |
| 365 | read_lock_bh(&tbl->lock); |
Julian Anastasov | c5e2946 | 2006-10-03 15:49:46 -0700 | [diff] [blame] | 366 | for (n = tbl->hash_buckets[hash_val & tbl->hash_mask]; n; n = n->next) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 367 | if (dev == n->dev && !memcmp(n->primary_key, pkey, key_len)) { |
| 368 | neigh_hold(n); |
| 369 | NEIGH_CACHE_STAT_INC(tbl, hits); |
| 370 | break; |
| 371 | } |
| 372 | } |
| 373 | read_unlock_bh(&tbl->lock); |
| 374 | return n; |
| 375 | } |
| 376 | |
Eric W. Biederman | 426b530 | 2008-01-24 00:13:18 -0800 | [diff] [blame] | 377 | struct neighbour *neigh_lookup_nodev(struct neigh_table *tbl, struct net *net, |
| 378 | const void *pkey) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 379 | { |
| 380 | struct neighbour *n; |
| 381 | int key_len = tbl->key_len; |
Julian Anastasov | c5e2946 | 2006-10-03 15:49:46 -0700 | [diff] [blame] | 382 | u32 hash_val = tbl->hash(pkey, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 383 | |
| 384 | NEIGH_CACHE_STAT_INC(tbl, lookups); |
| 385 | |
| 386 | read_lock_bh(&tbl->lock); |
Julian Anastasov | c5e2946 | 2006-10-03 15:49:46 -0700 | [diff] [blame] | 387 | for (n = tbl->hash_buckets[hash_val & tbl->hash_mask]; n; n = n->next) { |
Eric W. Biederman | 426b530 | 2008-01-24 00:13:18 -0800 | [diff] [blame] | 388 | if (!memcmp(n->primary_key, pkey, key_len) && |
| 389 | (net == n->dev->nd_net)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 390 | neigh_hold(n); |
| 391 | NEIGH_CACHE_STAT_INC(tbl, hits); |
| 392 | break; |
| 393 | } |
| 394 | } |
| 395 | read_unlock_bh(&tbl->lock); |
| 396 | return n; |
| 397 | } |
| 398 | |
| 399 | struct neighbour *neigh_create(struct neigh_table *tbl, const void *pkey, |
| 400 | struct net_device *dev) |
| 401 | { |
| 402 | u32 hash_val; |
| 403 | int key_len = tbl->key_len; |
| 404 | int error; |
| 405 | struct neighbour *n1, *rc, *n = neigh_alloc(tbl); |
| 406 | |
| 407 | if (!n) { |
| 408 | rc = ERR_PTR(-ENOBUFS); |
| 409 | goto out; |
| 410 | } |
| 411 | |
| 412 | memcpy(n->primary_key, pkey, key_len); |
| 413 | n->dev = dev; |
| 414 | dev_hold(dev); |
| 415 | |
| 416 | /* Protocol specific setup. */ |
| 417 | if (tbl->constructor && (error = tbl->constructor(n)) < 0) { |
| 418 | rc = ERR_PTR(error); |
| 419 | goto out_neigh_release; |
| 420 | } |
| 421 | |
| 422 | /* Device specific setup. */ |
| 423 | if (n->parms->neigh_setup && |
| 424 | (error = n->parms->neigh_setup(n)) < 0) { |
| 425 | rc = ERR_PTR(error); |
| 426 | goto out_neigh_release; |
| 427 | } |
| 428 | |
| 429 | n->confirmed = jiffies - (n->parms->base_reachable_time << 1); |
| 430 | |
| 431 | write_lock_bh(&tbl->lock); |
| 432 | |
| 433 | if (atomic_read(&tbl->entries) > (tbl->hash_mask + 1)) |
| 434 | neigh_hash_grow(tbl, (tbl->hash_mask + 1) << 1); |
| 435 | |
| 436 | hash_val = tbl->hash(pkey, dev) & tbl->hash_mask; |
| 437 | |
| 438 | if (n->parms->dead) { |
| 439 | rc = ERR_PTR(-EINVAL); |
| 440 | goto out_tbl_unlock; |
| 441 | } |
| 442 | |
| 443 | for (n1 = tbl->hash_buckets[hash_val]; n1; n1 = n1->next) { |
| 444 | if (dev == n1->dev && !memcmp(n1->primary_key, pkey, key_len)) { |
| 445 | neigh_hold(n1); |
| 446 | rc = n1; |
| 447 | goto out_tbl_unlock; |
| 448 | } |
| 449 | } |
| 450 | |
| 451 | n->next = tbl->hash_buckets[hash_val]; |
| 452 | tbl->hash_buckets[hash_val] = n; |
| 453 | n->dead = 0; |
| 454 | neigh_hold(n); |
| 455 | write_unlock_bh(&tbl->lock); |
| 456 | NEIGH_PRINTK2("neigh %p is created.\n", n); |
| 457 | rc = n; |
| 458 | out: |
| 459 | return rc; |
| 460 | out_tbl_unlock: |
| 461 | write_unlock_bh(&tbl->lock); |
| 462 | out_neigh_release: |
| 463 | neigh_release(n); |
| 464 | goto out; |
| 465 | } |
| 466 | |
Eric W. Biederman | 426b530 | 2008-01-24 00:13:18 -0800 | [diff] [blame] | 467 | struct pneigh_entry * pneigh_lookup(struct neigh_table *tbl, |
| 468 | struct net *net, const void *pkey, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 469 | struct net_device *dev, int creat) |
| 470 | { |
| 471 | struct pneigh_entry *n; |
| 472 | int key_len = tbl->key_len; |
| 473 | u32 hash_val = *(u32 *)(pkey + key_len - 4); |
| 474 | |
| 475 | hash_val ^= (hash_val >> 16); |
| 476 | hash_val ^= hash_val >> 8; |
| 477 | hash_val ^= hash_val >> 4; |
| 478 | hash_val &= PNEIGH_HASHMASK; |
| 479 | |
| 480 | read_lock_bh(&tbl->lock); |
| 481 | |
| 482 | for (n = tbl->phash_buckets[hash_val]; n; n = n->next) { |
| 483 | if (!memcmp(n->key, pkey, key_len) && |
Eric W. Biederman | 426b530 | 2008-01-24 00:13:18 -0800 | [diff] [blame] | 484 | (n->net == net) && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 485 | (n->dev == dev || !n->dev)) { |
| 486 | read_unlock_bh(&tbl->lock); |
| 487 | goto out; |
| 488 | } |
| 489 | } |
| 490 | read_unlock_bh(&tbl->lock); |
| 491 | n = NULL; |
| 492 | if (!creat) |
| 493 | goto out; |
| 494 | |
Pavel Emelyanov | 4ae2894 | 2007-10-15 12:54:15 -0700 | [diff] [blame] | 495 | ASSERT_RTNL(); |
| 496 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 497 | n = kmalloc(sizeof(*n) + key_len, GFP_KERNEL); |
| 498 | if (!n) |
| 499 | goto out; |
| 500 | |
Eric W. Biederman | 426b530 | 2008-01-24 00:13:18 -0800 | [diff] [blame] | 501 | n->net = hold_net(net); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 502 | memcpy(n->key, pkey, key_len); |
| 503 | n->dev = dev; |
| 504 | if (dev) |
| 505 | dev_hold(dev); |
| 506 | |
| 507 | if (tbl->pconstructor && tbl->pconstructor(n)) { |
| 508 | if (dev) |
| 509 | dev_put(dev); |
| 510 | kfree(n); |
| 511 | n = NULL; |
| 512 | goto out; |
| 513 | } |
| 514 | |
| 515 | write_lock_bh(&tbl->lock); |
| 516 | n->next = tbl->phash_buckets[hash_val]; |
| 517 | tbl->phash_buckets[hash_val] = n; |
| 518 | write_unlock_bh(&tbl->lock); |
| 519 | out: |
| 520 | return n; |
| 521 | } |
| 522 | |
| 523 | |
Eric W. Biederman | 426b530 | 2008-01-24 00:13:18 -0800 | [diff] [blame] | 524 | int pneigh_delete(struct neigh_table *tbl, struct net *net, const void *pkey, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 525 | struct net_device *dev) |
| 526 | { |
| 527 | struct pneigh_entry *n, **np; |
| 528 | int key_len = tbl->key_len; |
| 529 | u32 hash_val = *(u32 *)(pkey + key_len - 4); |
| 530 | |
| 531 | hash_val ^= (hash_val >> 16); |
| 532 | hash_val ^= hash_val >> 8; |
| 533 | hash_val ^= hash_val >> 4; |
| 534 | hash_val &= PNEIGH_HASHMASK; |
| 535 | |
| 536 | write_lock_bh(&tbl->lock); |
| 537 | for (np = &tbl->phash_buckets[hash_val]; (n = *np) != NULL; |
| 538 | np = &n->next) { |
Eric W. Biederman | 426b530 | 2008-01-24 00:13:18 -0800 | [diff] [blame] | 539 | if (!memcmp(n->key, pkey, key_len) && n->dev == dev && |
| 540 | (n->net == net)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 541 | *np = n->next; |
| 542 | write_unlock_bh(&tbl->lock); |
| 543 | if (tbl->pdestructor) |
| 544 | tbl->pdestructor(n); |
| 545 | if (n->dev) |
| 546 | dev_put(n->dev); |
Eric W. Biederman | 426b530 | 2008-01-24 00:13:18 -0800 | [diff] [blame] | 547 | release_net(n->net); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 548 | kfree(n); |
| 549 | return 0; |
| 550 | } |
| 551 | } |
| 552 | write_unlock_bh(&tbl->lock); |
| 553 | return -ENOENT; |
| 554 | } |
| 555 | |
| 556 | static int pneigh_ifdown(struct neigh_table *tbl, struct net_device *dev) |
| 557 | { |
| 558 | struct pneigh_entry *n, **np; |
| 559 | u32 h; |
| 560 | |
| 561 | for (h = 0; h <= PNEIGH_HASHMASK; h++) { |
| 562 | np = &tbl->phash_buckets[h]; |
| 563 | while ((n = *np) != NULL) { |
| 564 | if (!dev || n->dev == dev) { |
| 565 | *np = n->next; |
| 566 | if (tbl->pdestructor) |
| 567 | tbl->pdestructor(n); |
| 568 | if (n->dev) |
| 569 | dev_put(n->dev); |
Eric W. Biederman | 426b530 | 2008-01-24 00:13:18 -0800 | [diff] [blame] | 570 | release_net(n->net); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 571 | kfree(n); |
| 572 | continue; |
| 573 | } |
| 574 | np = &n->next; |
| 575 | } |
| 576 | } |
| 577 | return -ENOENT; |
| 578 | } |
| 579 | |
Denis V. Lunev | 06f0511 | 2008-01-24 00:30:58 -0800 | [diff] [blame] | 580 | static void neigh_parms_destroy(struct neigh_parms *parms); |
| 581 | |
| 582 | static inline void neigh_parms_put(struct neigh_parms *parms) |
| 583 | { |
| 584 | if (atomic_dec_and_test(&parms->refcnt)) |
| 585 | neigh_parms_destroy(parms); |
| 586 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 587 | |
| 588 | /* |
| 589 | * neighbour must already be out of the table; |
| 590 | * |
| 591 | */ |
| 592 | void neigh_destroy(struct neighbour *neigh) |
| 593 | { |
| 594 | struct hh_cache *hh; |
| 595 | |
| 596 | NEIGH_CACHE_STAT_INC(neigh->tbl, destroys); |
| 597 | |
| 598 | if (!neigh->dead) { |
| 599 | printk(KERN_WARNING |
| 600 | "Destroying alive neighbour %p\n", neigh); |
| 601 | dump_stack(); |
| 602 | return; |
| 603 | } |
| 604 | |
| 605 | if (neigh_del_timer(neigh)) |
| 606 | printk(KERN_WARNING "Impossible event.\n"); |
| 607 | |
| 608 | while ((hh = neigh->hh) != NULL) { |
| 609 | neigh->hh = hh->hh_next; |
| 610 | hh->hh_next = NULL; |
Stephen Hemminger | 3644f0c | 2006-12-07 15:08:17 -0800 | [diff] [blame] | 611 | |
| 612 | write_seqlock_bh(&hh->hh_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 613 | hh->hh_output = neigh_blackhole; |
Stephen Hemminger | 3644f0c | 2006-12-07 15:08:17 -0800 | [diff] [blame] | 614 | write_sequnlock_bh(&hh->hh_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 615 | if (atomic_dec_and_test(&hh->hh_refcnt)) |
| 616 | kfree(hh); |
| 617 | } |
| 618 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 619 | skb_queue_purge(&neigh->arp_queue); |
| 620 | |
| 621 | dev_put(neigh->dev); |
| 622 | neigh_parms_put(neigh->parms); |
| 623 | |
| 624 | NEIGH_PRINTK2("neigh %p is destroyed.\n", neigh); |
| 625 | |
| 626 | atomic_dec(&neigh->tbl->entries); |
| 627 | kmem_cache_free(neigh->tbl->kmem_cachep, neigh); |
| 628 | } |
| 629 | |
| 630 | /* Neighbour state is suspicious; |
| 631 | disable fast path. |
| 632 | |
| 633 | Called with write_locked neigh. |
| 634 | */ |
| 635 | static void neigh_suspect(struct neighbour *neigh) |
| 636 | { |
| 637 | struct hh_cache *hh; |
| 638 | |
| 639 | NEIGH_PRINTK2("neigh %p is suspected.\n", neigh); |
| 640 | |
| 641 | neigh->output = neigh->ops->output; |
| 642 | |
| 643 | for (hh = neigh->hh; hh; hh = hh->hh_next) |
| 644 | hh->hh_output = neigh->ops->output; |
| 645 | } |
| 646 | |
| 647 | /* Neighbour state is OK; |
| 648 | enable fast path. |
| 649 | |
| 650 | Called with write_locked neigh. |
| 651 | */ |
| 652 | static void neigh_connect(struct neighbour *neigh) |
| 653 | { |
| 654 | struct hh_cache *hh; |
| 655 | |
| 656 | NEIGH_PRINTK2("neigh %p is connected.\n", neigh); |
| 657 | |
| 658 | neigh->output = neigh->ops->connected_output; |
| 659 | |
| 660 | for (hh = neigh->hh; hh; hh = hh->hh_next) |
| 661 | hh->hh_output = neigh->ops->hh_output; |
| 662 | } |
| 663 | |
| 664 | static void neigh_periodic_timer(unsigned long arg) |
| 665 | { |
| 666 | struct neigh_table *tbl = (struct neigh_table *)arg; |
| 667 | struct neighbour *n, **np; |
| 668 | unsigned long expire, now = jiffies; |
| 669 | |
| 670 | NEIGH_CACHE_STAT_INC(tbl, periodic_gc_runs); |
| 671 | |
| 672 | write_lock(&tbl->lock); |
| 673 | |
| 674 | /* |
| 675 | * periodically recompute ReachableTime from random function |
| 676 | */ |
| 677 | |
| 678 | if (time_after(now, tbl->last_rand + 300 * HZ)) { |
| 679 | struct neigh_parms *p; |
| 680 | tbl->last_rand = now; |
| 681 | for (p = &tbl->parms; p; p = p->next) |
| 682 | p->reachable_time = |
| 683 | neigh_rand_reach_time(p->base_reachable_time); |
| 684 | } |
| 685 | |
| 686 | np = &tbl->hash_buckets[tbl->hash_chain_gc]; |
| 687 | tbl->hash_chain_gc = ((tbl->hash_chain_gc + 1) & tbl->hash_mask); |
| 688 | |
| 689 | while ((n = *np) != NULL) { |
| 690 | unsigned int state; |
| 691 | |
| 692 | write_lock(&n->lock); |
| 693 | |
| 694 | state = n->nud_state; |
| 695 | if (state & (NUD_PERMANENT | NUD_IN_TIMER)) { |
| 696 | write_unlock(&n->lock); |
| 697 | goto next_elt; |
| 698 | } |
| 699 | |
| 700 | if (time_before(n->used, n->confirmed)) |
| 701 | n->used = n->confirmed; |
| 702 | |
| 703 | if (atomic_read(&n->refcnt) == 1 && |
| 704 | (state == NUD_FAILED || |
| 705 | time_after(now, n->used + n->parms->gc_staletime))) { |
| 706 | *np = n->next; |
| 707 | n->dead = 1; |
| 708 | write_unlock(&n->lock); |
Thomas Graf | 4f49455 | 2007-08-08 23:12:36 -0700 | [diff] [blame] | 709 | neigh_cleanup_and_release(n); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 710 | continue; |
| 711 | } |
| 712 | write_unlock(&n->lock); |
| 713 | |
| 714 | next_elt: |
| 715 | np = &n->next; |
| 716 | } |
| 717 | |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 718 | /* Cycle through all hash buckets every base_reachable_time/2 ticks. |
| 719 | * ARP entry timeouts range from 1/2 base_reachable_time to 3/2 |
| 720 | * base_reachable_time. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 721 | */ |
| 722 | expire = tbl->parms.base_reachable_time >> 1; |
| 723 | expire /= (tbl->hash_mask + 1); |
| 724 | if (!expire) |
| 725 | expire = 1; |
| 726 | |
Arjan van de Ven | f5a6e01 | 2007-02-05 17:59:51 -0800 | [diff] [blame] | 727 | if (expire>HZ) |
| 728 | mod_timer(&tbl->gc_timer, round_jiffies(now + expire)); |
| 729 | else |
| 730 | mod_timer(&tbl->gc_timer, now + expire); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 731 | |
| 732 | write_unlock(&tbl->lock); |
| 733 | } |
| 734 | |
| 735 | static __inline__ int neigh_max_probes(struct neighbour *n) |
| 736 | { |
| 737 | struct neigh_parms *p = n->parms; |
| 738 | return (n->nud_state & NUD_PROBE ? |
| 739 | p->ucast_probes : |
| 740 | p->ucast_probes + p->app_probes + p->mcast_probes); |
| 741 | } |
| 742 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 743 | /* Called when a timer expires for a neighbour entry. */ |
| 744 | |
| 745 | static void neigh_timer_handler(unsigned long arg) |
| 746 | { |
| 747 | unsigned long now, next; |
| 748 | struct neighbour *neigh = (struct neighbour *)arg; |
| 749 | unsigned state; |
| 750 | int notify = 0; |
| 751 | |
| 752 | write_lock(&neigh->lock); |
| 753 | |
| 754 | state = neigh->nud_state; |
| 755 | now = jiffies; |
| 756 | next = now + HZ; |
| 757 | |
| 758 | if (!(state & NUD_IN_TIMER)) { |
| 759 | #ifndef CONFIG_SMP |
| 760 | printk(KERN_WARNING "neigh: timer & !nud_in_timer\n"); |
| 761 | #endif |
| 762 | goto out; |
| 763 | } |
| 764 | |
| 765 | if (state & NUD_REACHABLE) { |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 766 | if (time_before_eq(now, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 767 | neigh->confirmed + neigh->parms->reachable_time)) { |
| 768 | NEIGH_PRINTK2("neigh %p is still alive.\n", neigh); |
| 769 | next = neigh->confirmed + neigh->parms->reachable_time; |
| 770 | } else if (time_before_eq(now, |
| 771 | neigh->used + neigh->parms->delay_probe_time)) { |
| 772 | NEIGH_PRINTK2("neigh %p is delayed.\n", neigh); |
| 773 | neigh->nud_state = NUD_DELAY; |
YOSHIFUJI Hideaki | 955aaa2 | 2006-03-20 16:52:52 -0800 | [diff] [blame] | 774 | neigh->updated = jiffies; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 775 | neigh_suspect(neigh); |
| 776 | next = now + neigh->parms->delay_probe_time; |
| 777 | } else { |
| 778 | NEIGH_PRINTK2("neigh %p is suspected.\n", neigh); |
| 779 | neigh->nud_state = NUD_STALE; |
YOSHIFUJI Hideaki | 955aaa2 | 2006-03-20 16:52:52 -0800 | [diff] [blame] | 780 | neigh->updated = jiffies; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 781 | neigh_suspect(neigh); |
Tom Tucker | 8d71740 | 2006-07-30 20:43:36 -0700 | [diff] [blame] | 782 | notify = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 783 | } |
| 784 | } else if (state & NUD_DELAY) { |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 785 | if (time_before_eq(now, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 786 | neigh->confirmed + neigh->parms->delay_probe_time)) { |
| 787 | NEIGH_PRINTK2("neigh %p is now reachable.\n", neigh); |
| 788 | neigh->nud_state = NUD_REACHABLE; |
YOSHIFUJI Hideaki | 955aaa2 | 2006-03-20 16:52:52 -0800 | [diff] [blame] | 789 | neigh->updated = jiffies; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 790 | neigh_connect(neigh); |
Tom Tucker | 8d71740 | 2006-07-30 20:43:36 -0700 | [diff] [blame] | 791 | notify = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 792 | next = neigh->confirmed + neigh->parms->reachable_time; |
| 793 | } else { |
| 794 | NEIGH_PRINTK2("neigh %p is probed.\n", neigh); |
| 795 | neigh->nud_state = NUD_PROBE; |
YOSHIFUJI Hideaki | 955aaa2 | 2006-03-20 16:52:52 -0800 | [diff] [blame] | 796 | neigh->updated = jiffies; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 797 | atomic_set(&neigh->probes, 0); |
| 798 | next = now + neigh->parms->retrans_time; |
| 799 | } |
| 800 | } else { |
| 801 | /* NUD_PROBE|NUD_INCOMPLETE */ |
| 802 | next = now + neigh->parms->retrans_time; |
| 803 | } |
| 804 | |
| 805 | if ((neigh->nud_state & (NUD_INCOMPLETE | NUD_PROBE)) && |
| 806 | atomic_read(&neigh->probes) >= neigh_max_probes(neigh)) { |
| 807 | struct sk_buff *skb; |
| 808 | |
| 809 | neigh->nud_state = NUD_FAILED; |
YOSHIFUJI Hideaki | 955aaa2 | 2006-03-20 16:52:52 -0800 | [diff] [blame] | 810 | neigh->updated = jiffies; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 811 | notify = 1; |
| 812 | NEIGH_CACHE_STAT_INC(neigh->tbl, res_failed); |
| 813 | NEIGH_PRINTK2("neigh %p is failed.\n", neigh); |
| 814 | |
| 815 | /* It is very thin place. report_unreachable is very complicated |
| 816 | routine. Particularly, it can hit the same neighbour entry! |
| 817 | |
| 818 | So that, we try to be accurate and avoid dead loop. --ANK |
| 819 | */ |
| 820 | while (neigh->nud_state == NUD_FAILED && |
| 821 | (skb = __skb_dequeue(&neigh->arp_queue)) != NULL) { |
| 822 | write_unlock(&neigh->lock); |
| 823 | neigh->ops->error_report(neigh, skb); |
| 824 | write_lock(&neigh->lock); |
| 825 | } |
| 826 | skb_queue_purge(&neigh->arp_queue); |
| 827 | } |
| 828 | |
| 829 | if (neigh->nud_state & NUD_IN_TIMER) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 830 | if (time_before(next, jiffies + HZ/2)) |
| 831 | next = jiffies + HZ/2; |
Herbert Xu | 6fb9974 | 2005-10-23 16:37:48 +1000 | [diff] [blame] | 832 | if (!mod_timer(&neigh->timer, next)) |
| 833 | neigh_hold(neigh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 834 | } |
| 835 | if (neigh->nud_state & (NUD_INCOMPLETE | NUD_PROBE)) { |
| 836 | struct sk_buff *skb = skb_peek(&neigh->arp_queue); |
| 837 | /* keep skb alive even if arp_queue overflows */ |
| 838 | if (skb) |
| 839 | skb_get(skb); |
| 840 | write_unlock(&neigh->lock); |
| 841 | neigh->ops->solicit(neigh, skb); |
| 842 | atomic_inc(&neigh->probes); |
| 843 | if (skb) |
| 844 | kfree_skb(skb); |
| 845 | } else { |
| 846 | out: |
| 847 | write_unlock(&neigh->lock); |
| 848 | } |
| 849 | |
Thomas Graf | d961db3 | 2007-08-08 23:12:56 -0700 | [diff] [blame] | 850 | if (notify) |
| 851 | neigh_update_notify(neigh); |
| 852 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 853 | neigh_release(neigh); |
| 854 | } |
| 855 | |
| 856 | int __neigh_event_send(struct neighbour *neigh, struct sk_buff *skb) |
| 857 | { |
| 858 | int rc; |
| 859 | unsigned long now; |
| 860 | |
| 861 | write_lock_bh(&neigh->lock); |
| 862 | |
| 863 | rc = 0; |
| 864 | if (neigh->nud_state & (NUD_CONNECTED | NUD_DELAY | NUD_PROBE)) |
| 865 | goto out_unlock_bh; |
| 866 | |
| 867 | now = jiffies; |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 868 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 869 | if (!(neigh->nud_state & (NUD_STALE | NUD_INCOMPLETE))) { |
| 870 | if (neigh->parms->mcast_probes + neigh->parms->app_probes) { |
| 871 | atomic_set(&neigh->probes, neigh->parms->ucast_probes); |
| 872 | neigh->nud_state = NUD_INCOMPLETE; |
YOSHIFUJI Hideaki | 955aaa2 | 2006-03-20 16:52:52 -0800 | [diff] [blame] | 873 | neigh->updated = jiffies; |
David S. Miller | 667347f | 2005-09-27 12:07:44 -0700 | [diff] [blame] | 874 | neigh_add_timer(neigh, now + 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 875 | } else { |
| 876 | neigh->nud_state = NUD_FAILED; |
YOSHIFUJI Hideaki | 955aaa2 | 2006-03-20 16:52:52 -0800 | [diff] [blame] | 877 | neigh->updated = jiffies; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 878 | write_unlock_bh(&neigh->lock); |
| 879 | |
| 880 | if (skb) |
| 881 | kfree_skb(skb); |
| 882 | return 1; |
| 883 | } |
| 884 | } else if (neigh->nud_state & NUD_STALE) { |
| 885 | NEIGH_PRINTK2("neigh %p is delayed.\n", neigh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 886 | neigh->nud_state = NUD_DELAY; |
YOSHIFUJI Hideaki | 955aaa2 | 2006-03-20 16:52:52 -0800 | [diff] [blame] | 887 | neigh->updated = jiffies; |
David S. Miller | 667347f | 2005-09-27 12:07:44 -0700 | [diff] [blame] | 888 | neigh_add_timer(neigh, |
| 889 | jiffies + neigh->parms->delay_probe_time); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 890 | } |
| 891 | |
| 892 | if (neigh->nud_state == NUD_INCOMPLETE) { |
| 893 | if (skb) { |
| 894 | if (skb_queue_len(&neigh->arp_queue) >= |
| 895 | neigh->parms->queue_len) { |
| 896 | struct sk_buff *buff; |
| 897 | buff = neigh->arp_queue.next; |
| 898 | __skb_unlink(buff, &neigh->arp_queue); |
| 899 | kfree_skb(buff); |
| 900 | } |
| 901 | __skb_queue_tail(&neigh->arp_queue, skb); |
| 902 | } |
| 903 | rc = 1; |
| 904 | } |
| 905 | out_unlock_bh: |
| 906 | write_unlock_bh(&neigh->lock); |
| 907 | return rc; |
| 908 | } |
| 909 | |
Stephen Hemminger | e92b43a | 2006-08-17 18:17:37 -0700 | [diff] [blame] | 910 | static void neigh_update_hhs(struct neighbour *neigh) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 911 | { |
| 912 | struct hh_cache *hh; |
Stephen Hemminger | 3b04ddd | 2007-10-09 01:40:57 -0700 | [diff] [blame] | 913 | void (*update)(struct hh_cache*, const struct net_device*, const unsigned char *) |
| 914 | = neigh->dev->header_ops->cache_update; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 915 | |
| 916 | if (update) { |
| 917 | for (hh = neigh->hh; hh; hh = hh->hh_next) { |
Stephen Hemminger | 3644f0c | 2006-12-07 15:08:17 -0800 | [diff] [blame] | 918 | write_seqlock_bh(&hh->hh_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 919 | update(hh, neigh->dev, neigh->ha); |
Stephen Hemminger | 3644f0c | 2006-12-07 15:08:17 -0800 | [diff] [blame] | 920 | write_sequnlock_bh(&hh->hh_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 921 | } |
| 922 | } |
| 923 | } |
| 924 | |
| 925 | |
| 926 | |
| 927 | /* Generic update routine. |
| 928 | -- lladdr is new lladdr or NULL, if it is not supplied. |
| 929 | -- new is new state. |
| 930 | -- flags |
| 931 | NEIGH_UPDATE_F_OVERRIDE allows to override existing lladdr, |
| 932 | if it is different. |
| 933 | NEIGH_UPDATE_F_WEAK_OVERRIDE will suspect existing "connected" |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 934 | lladdr instead of overriding it |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 935 | if it is different. |
| 936 | It also allows to retain current state |
| 937 | if lladdr is unchanged. |
| 938 | NEIGH_UPDATE_F_ADMIN means that the change is administrative. |
| 939 | |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 940 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER allows to override existing |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 941 | NTF_ROUTER flag. |
| 942 | NEIGH_UPDATE_F_ISROUTER indicates if the neighbour is known as |
| 943 | a router. |
| 944 | |
| 945 | Caller MUST hold reference count on the entry. |
| 946 | */ |
| 947 | |
| 948 | int neigh_update(struct neighbour *neigh, const u8 *lladdr, u8 new, |
| 949 | u32 flags) |
| 950 | { |
| 951 | u8 old; |
| 952 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 953 | int notify = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 954 | struct net_device *dev; |
| 955 | int update_isrouter = 0; |
| 956 | |
| 957 | write_lock_bh(&neigh->lock); |
| 958 | |
| 959 | dev = neigh->dev; |
| 960 | old = neigh->nud_state; |
| 961 | err = -EPERM; |
| 962 | |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 963 | if (!(flags & NEIGH_UPDATE_F_ADMIN) && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 964 | (old & (NUD_NOARP | NUD_PERMANENT))) |
| 965 | goto out; |
| 966 | |
| 967 | if (!(new & NUD_VALID)) { |
| 968 | neigh_del_timer(neigh); |
| 969 | if (old & NUD_CONNECTED) |
| 970 | neigh_suspect(neigh); |
| 971 | neigh->nud_state = new; |
| 972 | err = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 973 | notify = old & NUD_VALID; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 974 | goto out; |
| 975 | } |
| 976 | |
| 977 | /* Compare new lladdr with cached one */ |
| 978 | if (!dev->addr_len) { |
| 979 | /* First case: device needs no address. */ |
| 980 | lladdr = neigh->ha; |
| 981 | } else if (lladdr) { |
| 982 | /* The second case: if something is already cached |
| 983 | and a new address is proposed: |
| 984 | - compare new & old |
| 985 | - if they are different, check override flag |
| 986 | */ |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 987 | if ((old & NUD_VALID) && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 988 | !memcmp(lladdr, neigh->ha, dev->addr_len)) |
| 989 | lladdr = neigh->ha; |
| 990 | } else { |
| 991 | /* No address is supplied; if we know something, |
| 992 | use it, otherwise discard the request. |
| 993 | */ |
| 994 | err = -EINVAL; |
| 995 | if (!(old & NUD_VALID)) |
| 996 | goto out; |
| 997 | lladdr = neigh->ha; |
| 998 | } |
| 999 | |
| 1000 | if (new & NUD_CONNECTED) |
| 1001 | neigh->confirmed = jiffies; |
| 1002 | neigh->updated = jiffies; |
| 1003 | |
| 1004 | /* If entry was valid and address is not changed, |
| 1005 | do not change entry state, if new one is STALE. |
| 1006 | */ |
| 1007 | err = 0; |
| 1008 | update_isrouter = flags & NEIGH_UPDATE_F_OVERRIDE_ISROUTER; |
| 1009 | if (old & NUD_VALID) { |
| 1010 | if (lladdr != neigh->ha && !(flags & NEIGH_UPDATE_F_OVERRIDE)) { |
| 1011 | update_isrouter = 0; |
| 1012 | if ((flags & NEIGH_UPDATE_F_WEAK_OVERRIDE) && |
| 1013 | (old & NUD_CONNECTED)) { |
| 1014 | lladdr = neigh->ha; |
| 1015 | new = NUD_STALE; |
| 1016 | } else |
| 1017 | goto out; |
| 1018 | } else { |
| 1019 | if (lladdr == neigh->ha && new == NUD_STALE && |
| 1020 | ((flags & NEIGH_UPDATE_F_WEAK_OVERRIDE) || |
| 1021 | (old & NUD_CONNECTED)) |
| 1022 | ) |
| 1023 | new = old; |
| 1024 | } |
| 1025 | } |
| 1026 | |
| 1027 | if (new != old) { |
| 1028 | neigh_del_timer(neigh); |
Pavel Emelyanov | a43d899 | 2007-12-20 15:49:05 -0800 | [diff] [blame] | 1029 | if (new & NUD_IN_TIMER) |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1030 | neigh_add_timer(neigh, (jiffies + |
| 1031 | ((new & NUD_REACHABLE) ? |
David S. Miller | 667347f | 2005-09-27 12:07:44 -0700 | [diff] [blame] | 1032 | neigh->parms->reachable_time : |
| 1033 | 0))); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1034 | neigh->nud_state = new; |
| 1035 | } |
| 1036 | |
| 1037 | if (lladdr != neigh->ha) { |
| 1038 | memcpy(&neigh->ha, lladdr, dev->addr_len); |
| 1039 | neigh_update_hhs(neigh); |
| 1040 | if (!(new & NUD_CONNECTED)) |
| 1041 | neigh->confirmed = jiffies - |
| 1042 | (neigh->parms->base_reachable_time << 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1043 | notify = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1044 | } |
| 1045 | if (new == old) |
| 1046 | goto out; |
| 1047 | if (new & NUD_CONNECTED) |
| 1048 | neigh_connect(neigh); |
| 1049 | else |
| 1050 | neigh_suspect(neigh); |
| 1051 | if (!(old & NUD_VALID)) { |
| 1052 | struct sk_buff *skb; |
| 1053 | |
| 1054 | /* Again: avoid dead loop if something went wrong */ |
| 1055 | |
| 1056 | while (neigh->nud_state & NUD_VALID && |
| 1057 | (skb = __skb_dequeue(&neigh->arp_queue)) != NULL) { |
| 1058 | struct neighbour *n1 = neigh; |
| 1059 | write_unlock_bh(&neigh->lock); |
| 1060 | /* On shaper/eql skb->dst->neighbour != neigh :( */ |
| 1061 | if (skb->dst && skb->dst->neighbour) |
| 1062 | n1 = skb->dst->neighbour; |
| 1063 | n1->output(skb); |
| 1064 | write_lock_bh(&neigh->lock); |
| 1065 | } |
| 1066 | skb_queue_purge(&neigh->arp_queue); |
| 1067 | } |
| 1068 | out: |
| 1069 | if (update_isrouter) { |
| 1070 | neigh->flags = (flags & NEIGH_UPDATE_F_ISROUTER) ? |
| 1071 | (neigh->flags | NTF_ROUTER) : |
| 1072 | (neigh->flags & ~NTF_ROUTER); |
| 1073 | } |
| 1074 | write_unlock_bh(&neigh->lock); |
Tom Tucker | 8d71740 | 2006-07-30 20:43:36 -0700 | [diff] [blame] | 1075 | |
| 1076 | if (notify) |
Thomas Graf | d961db3 | 2007-08-08 23:12:56 -0700 | [diff] [blame] | 1077 | neigh_update_notify(neigh); |
| 1078 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1079 | return err; |
| 1080 | } |
| 1081 | |
| 1082 | struct neighbour *neigh_event_ns(struct neigh_table *tbl, |
| 1083 | u8 *lladdr, void *saddr, |
| 1084 | struct net_device *dev) |
| 1085 | { |
| 1086 | struct neighbour *neigh = __neigh_lookup(tbl, saddr, dev, |
| 1087 | lladdr || !dev->addr_len); |
| 1088 | if (neigh) |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1089 | neigh_update(neigh, lladdr, NUD_STALE, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1090 | NEIGH_UPDATE_F_OVERRIDE); |
| 1091 | return neigh; |
| 1092 | } |
| 1093 | |
| 1094 | static void neigh_hh_init(struct neighbour *n, struct dst_entry *dst, |
Al Viro | d77072e | 2006-09-28 14:20:34 -0700 | [diff] [blame] | 1095 | __be16 protocol) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1096 | { |
| 1097 | struct hh_cache *hh; |
| 1098 | struct net_device *dev = dst->dev; |
| 1099 | |
| 1100 | for (hh = n->hh; hh; hh = hh->hh_next) |
| 1101 | if (hh->hh_type == protocol) |
| 1102 | break; |
| 1103 | |
Andrew Morton | 77d04bd | 2006-04-07 14:52:59 -0700 | [diff] [blame] | 1104 | if (!hh && (hh = kzalloc(sizeof(*hh), GFP_ATOMIC)) != NULL) { |
Stephen Hemminger | 3644f0c | 2006-12-07 15:08:17 -0800 | [diff] [blame] | 1105 | seqlock_init(&hh->hh_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1106 | hh->hh_type = protocol; |
| 1107 | atomic_set(&hh->hh_refcnt, 0); |
| 1108 | hh->hh_next = NULL; |
Stephen Hemminger | 3b04ddd | 2007-10-09 01:40:57 -0700 | [diff] [blame] | 1109 | |
| 1110 | if (dev->header_ops->cache(n, hh)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1111 | kfree(hh); |
| 1112 | hh = NULL; |
| 1113 | } else { |
| 1114 | atomic_inc(&hh->hh_refcnt); |
| 1115 | hh->hh_next = n->hh; |
| 1116 | n->hh = hh; |
| 1117 | if (n->nud_state & NUD_CONNECTED) |
| 1118 | hh->hh_output = n->ops->hh_output; |
| 1119 | else |
| 1120 | hh->hh_output = n->ops->output; |
| 1121 | } |
| 1122 | } |
| 1123 | if (hh) { |
| 1124 | atomic_inc(&hh->hh_refcnt); |
| 1125 | dst->hh = hh; |
| 1126 | } |
| 1127 | } |
| 1128 | |
| 1129 | /* This function can be used in contexts, where only old dev_queue_xmit |
| 1130 | worked, f.e. if you want to override normal output path (eql, shaper), |
| 1131 | but resolution is not made yet. |
| 1132 | */ |
| 1133 | |
| 1134 | int neigh_compat_output(struct sk_buff *skb) |
| 1135 | { |
| 1136 | struct net_device *dev = skb->dev; |
| 1137 | |
Arnaldo Carvalho de Melo | bbe735e | 2007-03-10 22:16:10 -0300 | [diff] [blame] | 1138 | __skb_pull(skb, skb_network_offset(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1139 | |
Stephen Hemminger | 0c4e858 | 2007-10-09 01:36:32 -0700 | [diff] [blame] | 1140 | if (dev_hard_header(skb, dev, ntohs(skb->protocol), NULL, NULL, |
| 1141 | skb->len) < 0 && |
Stephen Hemminger | 3b04ddd | 2007-10-09 01:40:57 -0700 | [diff] [blame] | 1142 | dev->header_ops->rebuild(skb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1143 | return 0; |
| 1144 | |
| 1145 | return dev_queue_xmit(skb); |
| 1146 | } |
| 1147 | |
| 1148 | /* Slow and careful. */ |
| 1149 | |
| 1150 | int neigh_resolve_output(struct sk_buff *skb) |
| 1151 | { |
| 1152 | struct dst_entry *dst = skb->dst; |
| 1153 | struct neighbour *neigh; |
| 1154 | int rc = 0; |
| 1155 | |
| 1156 | if (!dst || !(neigh = dst->neighbour)) |
| 1157 | goto discard; |
| 1158 | |
Arnaldo Carvalho de Melo | bbe735e | 2007-03-10 22:16:10 -0300 | [diff] [blame] | 1159 | __skb_pull(skb, skb_network_offset(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1160 | |
| 1161 | if (!neigh_event_send(neigh, skb)) { |
| 1162 | int err; |
| 1163 | struct net_device *dev = neigh->dev; |
Stephen Hemminger | 3b04ddd | 2007-10-09 01:40:57 -0700 | [diff] [blame] | 1164 | if (dev->header_ops->cache && !dst->hh) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1165 | write_lock_bh(&neigh->lock); |
| 1166 | if (!dst->hh) |
| 1167 | neigh_hh_init(neigh, dst, dst->ops->protocol); |
Stephen Hemminger | 0c4e858 | 2007-10-09 01:36:32 -0700 | [diff] [blame] | 1168 | err = dev_hard_header(skb, dev, ntohs(skb->protocol), |
| 1169 | neigh->ha, NULL, skb->len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1170 | write_unlock_bh(&neigh->lock); |
| 1171 | } else { |
| 1172 | read_lock_bh(&neigh->lock); |
Stephen Hemminger | 0c4e858 | 2007-10-09 01:36:32 -0700 | [diff] [blame] | 1173 | err = dev_hard_header(skb, dev, ntohs(skb->protocol), |
| 1174 | neigh->ha, NULL, skb->len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1175 | read_unlock_bh(&neigh->lock); |
| 1176 | } |
| 1177 | if (err >= 0) |
| 1178 | rc = neigh->ops->queue_xmit(skb); |
| 1179 | else |
| 1180 | goto out_kfree_skb; |
| 1181 | } |
| 1182 | out: |
| 1183 | return rc; |
| 1184 | discard: |
| 1185 | NEIGH_PRINTK1("neigh_resolve_output: dst=%p neigh=%p\n", |
| 1186 | dst, dst ? dst->neighbour : NULL); |
| 1187 | out_kfree_skb: |
| 1188 | rc = -EINVAL; |
| 1189 | kfree_skb(skb); |
| 1190 | goto out; |
| 1191 | } |
| 1192 | |
| 1193 | /* As fast as possible without hh cache */ |
| 1194 | |
| 1195 | int neigh_connected_output(struct sk_buff *skb) |
| 1196 | { |
| 1197 | int err; |
| 1198 | struct dst_entry *dst = skb->dst; |
| 1199 | struct neighbour *neigh = dst->neighbour; |
| 1200 | struct net_device *dev = neigh->dev; |
| 1201 | |
Arnaldo Carvalho de Melo | bbe735e | 2007-03-10 22:16:10 -0300 | [diff] [blame] | 1202 | __skb_pull(skb, skb_network_offset(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1203 | |
| 1204 | read_lock_bh(&neigh->lock); |
Stephen Hemminger | 0c4e858 | 2007-10-09 01:36:32 -0700 | [diff] [blame] | 1205 | err = dev_hard_header(skb, dev, ntohs(skb->protocol), |
| 1206 | neigh->ha, NULL, skb->len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1207 | read_unlock_bh(&neigh->lock); |
| 1208 | if (err >= 0) |
| 1209 | err = neigh->ops->queue_xmit(skb); |
| 1210 | else { |
| 1211 | err = -EINVAL; |
| 1212 | kfree_skb(skb); |
| 1213 | } |
| 1214 | return err; |
| 1215 | } |
| 1216 | |
| 1217 | static void neigh_proxy_process(unsigned long arg) |
| 1218 | { |
| 1219 | struct neigh_table *tbl = (struct neigh_table *)arg; |
| 1220 | long sched_next = 0; |
| 1221 | unsigned long now = jiffies; |
| 1222 | struct sk_buff *skb; |
| 1223 | |
| 1224 | spin_lock(&tbl->proxy_queue.lock); |
| 1225 | |
| 1226 | skb = tbl->proxy_queue.next; |
| 1227 | |
| 1228 | while (skb != (struct sk_buff *)&tbl->proxy_queue) { |
| 1229 | struct sk_buff *back = skb; |
Patrick McHardy | a61bbcf | 2005-08-14 17:24:31 -0700 | [diff] [blame] | 1230 | long tdif = NEIGH_CB(back)->sched_next - now; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1231 | |
| 1232 | skb = skb->next; |
| 1233 | if (tdif <= 0) { |
| 1234 | struct net_device *dev = back->dev; |
| 1235 | __skb_unlink(back, &tbl->proxy_queue); |
| 1236 | if (tbl->proxy_redo && netif_running(dev)) |
| 1237 | tbl->proxy_redo(back); |
| 1238 | else |
| 1239 | kfree_skb(back); |
| 1240 | |
| 1241 | dev_put(dev); |
| 1242 | } else if (!sched_next || tdif < sched_next) |
| 1243 | sched_next = tdif; |
| 1244 | } |
| 1245 | del_timer(&tbl->proxy_timer); |
| 1246 | if (sched_next) |
| 1247 | mod_timer(&tbl->proxy_timer, jiffies + sched_next); |
| 1248 | spin_unlock(&tbl->proxy_queue.lock); |
| 1249 | } |
| 1250 | |
| 1251 | void pneigh_enqueue(struct neigh_table *tbl, struct neigh_parms *p, |
| 1252 | struct sk_buff *skb) |
| 1253 | { |
| 1254 | unsigned long now = jiffies; |
| 1255 | unsigned long sched_next = now + (net_random() % p->proxy_delay); |
| 1256 | |
| 1257 | if (tbl->proxy_queue.qlen > p->proxy_qlen) { |
| 1258 | kfree_skb(skb); |
| 1259 | return; |
| 1260 | } |
Patrick McHardy | a61bbcf | 2005-08-14 17:24:31 -0700 | [diff] [blame] | 1261 | |
| 1262 | NEIGH_CB(skb)->sched_next = sched_next; |
| 1263 | NEIGH_CB(skb)->flags |= LOCALLY_ENQUEUED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1264 | |
| 1265 | spin_lock(&tbl->proxy_queue.lock); |
| 1266 | if (del_timer(&tbl->proxy_timer)) { |
| 1267 | if (time_before(tbl->proxy_timer.expires, sched_next)) |
| 1268 | sched_next = tbl->proxy_timer.expires; |
| 1269 | } |
| 1270 | dst_release(skb->dst); |
| 1271 | skb->dst = NULL; |
| 1272 | dev_hold(skb->dev); |
| 1273 | __skb_queue_tail(&tbl->proxy_queue, skb); |
| 1274 | mod_timer(&tbl->proxy_timer, sched_next); |
| 1275 | spin_unlock(&tbl->proxy_queue.lock); |
| 1276 | } |
| 1277 | |
Eric W. Biederman | 426b530 | 2008-01-24 00:13:18 -0800 | [diff] [blame] | 1278 | static inline struct neigh_parms *lookup_neigh_params(struct neigh_table *tbl, |
| 1279 | struct net *net, int ifindex) |
| 1280 | { |
| 1281 | struct neigh_parms *p; |
| 1282 | |
| 1283 | for (p = &tbl->parms; p; p = p->next) { |
| 1284 | if (p->net != net) |
| 1285 | continue; |
| 1286 | if ((p->dev && p->dev->ifindex == ifindex) || |
| 1287 | (!p->dev && !ifindex)) |
| 1288 | return p; |
| 1289 | } |
| 1290 | |
| 1291 | return NULL; |
| 1292 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1293 | |
| 1294 | struct neigh_parms *neigh_parms_alloc(struct net_device *dev, |
| 1295 | struct neigh_table *tbl) |
| 1296 | { |
Eric W. Biederman | 426b530 | 2008-01-24 00:13:18 -0800 | [diff] [blame] | 1297 | struct neigh_parms *p, *ref; |
| 1298 | struct net *net; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1299 | |
Denis V. Lunev | 486b51d | 2008-01-14 22:59:59 -0800 | [diff] [blame] | 1300 | net = dev->nd_net; |
Eric W. Biederman | 426b530 | 2008-01-24 00:13:18 -0800 | [diff] [blame] | 1301 | ref = lookup_neigh_params(tbl, net, 0); |
| 1302 | if (!ref) |
| 1303 | return NULL; |
| 1304 | |
| 1305 | p = kmemdup(ref, sizeof(*p), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1306 | if (p) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1307 | p->tbl = tbl; |
| 1308 | atomic_set(&p->refcnt, 1); |
| 1309 | INIT_RCU_HEAD(&p->rcu_head); |
| 1310 | p->reachable_time = |
| 1311 | neigh_rand_reach_time(p->base_reachable_time); |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1312 | |
Denis V. Lunev | 486b51d | 2008-01-14 22:59:59 -0800 | [diff] [blame] | 1313 | if (dev->neigh_setup && dev->neigh_setup(dev, p)) { |
| 1314 | kfree(p); |
| 1315 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1316 | } |
Denis V. Lunev | 486b51d | 2008-01-14 22:59:59 -0800 | [diff] [blame] | 1317 | |
| 1318 | dev_hold(dev); |
| 1319 | p->dev = dev; |
Eric W. Biederman | 426b530 | 2008-01-24 00:13:18 -0800 | [diff] [blame] | 1320 | p->net = hold_net(net); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1321 | p->sysctl_table = NULL; |
| 1322 | write_lock_bh(&tbl->lock); |
| 1323 | p->next = tbl->parms.next; |
| 1324 | tbl->parms.next = p; |
| 1325 | write_unlock_bh(&tbl->lock); |
| 1326 | } |
| 1327 | return p; |
| 1328 | } |
| 1329 | |
| 1330 | static void neigh_rcu_free_parms(struct rcu_head *head) |
| 1331 | { |
| 1332 | struct neigh_parms *parms = |
| 1333 | container_of(head, struct neigh_parms, rcu_head); |
| 1334 | |
| 1335 | neigh_parms_put(parms); |
| 1336 | } |
| 1337 | |
| 1338 | void neigh_parms_release(struct neigh_table *tbl, struct neigh_parms *parms) |
| 1339 | { |
| 1340 | struct neigh_parms **p; |
| 1341 | |
| 1342 | if (!parms || parms == &tbl->parms) |
| 1343 | return; |
| 1344 | write_lock_bh(&tbl->lock); |
| 1345 | for (p = &tbl->parms.next; *p; p = &(*p)->next) { |
| 1346 | if (*p == parms) { |
| 1347 | *p = parms->next; |
| 1348 | parms->dead = 1; |
| 1349 | write_unlock_bh(&tbl->lock); |
David S. Miller | cecbb63 | 2008-01-20 16:39:03 -0800 | [diff] [blame] | 1350 | if (parms->dev) |
| 1351 | dev_put(parms->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1352 | call_rcu(&parms->rcu_head, neigh_rcu_free_parms); |
| 1353 | return; |
| 1354 | } |
| 1355 | } |
| 1356 | write_unlock_bh(&tbl->lock); |
| 1357 | NEIGH_PRINTK1("neigh_parms_release: not found\n"); |
| 1358 | } |
| 1359 | |
Denis V. Lunev | 06f0511 | 2008-01-24 00:30:58 -0800 | [diff] [blame] | 1360 | static void neigh_parms_destroy(struct neigh_parms *parms) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1361 | { |
Eric W. Biederman | 426b530 | 2008-01-24 00:13:18 -0800 | [diff] [blame] | 1362 | release_net(parms->net); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1363 | kfree(parms); |
| 1364 | } |
| 1365 | |
Pavel Emelianov | c2ecba7 | 2007-04-17 12:45:31 -0700 | [diff] [blame] | 1366 | static struct lock_class_key neigh_table_proxy_queue_class; |
| 1367 | |
Simon Kelley | bd89efc | 2006-05-12 14:56:08 -0700 | [diff] [blame] | 1368 | void neigh_table_init_no_netlink(struct neigh_table *tbl) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1369 | { |
| 1370 | unsigned long now = jiffies; |
| 1371 | unsigned long phsize; |
| 1372 | |
Eric W. Biederman | 426b530 | 2008-01-24 00:13:18 -0800 | [diff] [blame] | 1373 | tbl->parms.net = &init_net; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1374 | atomic_set(&tbl->parms.refcnt, 1); |
| 1375 | INIT_RCU_HEAD(&tbl->parms.rcu_head); |
| 1376 | tbl->parms.reachable_time = |
| 1377 | neigh_rand_reach_time(tbl->parms.base_reachable_time); |
| 1378 | |
| 1379 | if (!tbl->kmem_cachep) |
Alexey Dobriyan | e5d679f33 | 2006-08-26 19:25:52 -0700 | [diff] [blame] | 1380 | tbl->kmem_cachep = |
| 1381 | kmem_cache_create(tbl->id, tbl->entry_size, 0, |
| 1382 | SLAB_HWCACHE_ALIGN|SLAB_PANIC, |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 1383 | NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1384 | tbl->stats = alloc_percpu(struct neigh_statistics); |
| 1385 | if (!tbl->stats) |
| 1386 | panic("cannot create neighbour cache statistics"); |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1387 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1388 | #ifdef CONFIG_PROC_FS |
Eric W. Biederman | 457c4cb | 2007-09-12 12:01:34 +0200 | [diff] [blame] | 1389 | tbl->pde = create_proc_entry(tbl->id, 0, init_net.proc_net_stat); |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1390 | if (!tbl->pde) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1391 | panic("cannot create neighbour proc dir entry"); |
| 1392 | tbl->pde->proc_fops = &neigh_stat_seq_fops; |
| 1393 | tbl->pde->data = tbl; |
| 1394 | #endif |
| 1395 | |
| 1396 | tbl->hash_mask = 1; |
| 1397 | tbl->hash_buckets = neigh_hash_alloc(tbl->hash_mask + 1); |
| 1398 | |
| 1399 | phsize = (PNEIGH_HASHMASK + 1) * sizeof(struct pneigh_entry *); |
Andrew Morton | 77d04bd | 2006-04-07 14:52:59 -0700 | [diff] [blame] | 1400 | tbl->phash_buckets = kzalloc(phsize, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1401 | |
| 1402 | if (!tbl->hash_buckets || !tbl->phash_buckets) |
| 1403 | panic("cannot allocate neighbour cache hashes"); |
| 1404 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1405 | get_random_bytes(&tbl->hash_rnd, sizeof(tbl->hash_rnd)); |
| 1406 | |
| 1407 | rwlock_init(&tbl->lock); |
Pavel Emelyanov | b24b8a2 | 2008-01-23 21:20:07 -0800 | [diff] [blame] | 1408 | setup_timer(&tbl->gc_timer, neigh_periodic_timer, (unsigned long)tbl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1409 | tbl->gc_timer.expires = now + 1; |
| 1410 | add_timer(&tbl->gc_timer); |
| 1411 | |
Pavel Emelyanov | b24b8a2 | 2008-01-23 21:20:07 -0800 | [diff] [blame] | 1412 | setup_timer(&tbl->proxy_timer, neigh_proxy_process, (unsigned long)tbl); |
Pavel Emelianov | c2ecba7 | 2007-04-17 12:45:31 -0700 | [diff] [blame] | 1413 | skb_queue_head_init_class(&tbl->proxy_queue, |
| 1414 | &neigh_table_proxy_queue_class); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1415 | |
| 1416 | tbl->last_flush = now; |
| 1417 | tbl->last_rand = now + tbl->parms.reachable_time * 20; |
Simon Kelley | bd89efc | 2006-05-12 14:56:08 -0700 | [diff] [blame] | 1418 | } |
| 1419 | |
| 1420 | void neigh_table_init(struct neigh_table *tbl) |
| 1421 | { |
| 1422 | struct neigh_table *tmp; |
| 1423 | |
| 1424 | neigh_table_init_no_netlink(tbl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1425 | write_lock(&neigh_tbl_lock); |
Simon Kelley | bd89efc | 2006-05-12 14:56:08 -0700 | [diff] [blame] | 1426 | for (tmp = neigh_tables; tmp; tmp = tmp->next) { |
| 1427 | if (tmp->family == tbl->family) |
| 1428 | break; |
| 1429 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1430 | tbl->next = neigh_tables; |
| 1431 | neigh_tables = tbl; |
| 1432 | write_unlock(&neigh_tbl_lock); |
Simon Kelley | bd89efc | 2006-05-12 14:56:08 -0700 | [diff] [blame] | 1433 | |
| 1434 | if (unlikely(tmp)) { |
| 1435 | printk(KERN_ERR "NEIGH: Registering multiple tables for " |
| 1436 | "family %d\n", tbl->family); |
| 1437 | dump_stack(); |
| 1438 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1439 | } |
| 1440 | |
| 1441 | int neigh_table_clear(struct neigh_table *tbl) |
| 1442 | { |
| 1443 | struct neigh_table **tp; |
| 1444 | |
| 1445 | /* It is not clean... Fix it to unload IPv6 module safely */ |
| 1446 | del_timer_sync(&tbl->gc_timer); |
| 1447 | del_timer_sync(&tbl->proxy_timer); |
| 1448 | pneigh_queue_purge(&tbl->proxy_queue); |
| 1449 | neigh_ifdown(tbl, NULL); |
| 1450 | if (atomic_read(&tbl->entries)) |
| 1451 | printk(KERN_CRIT "neighbour leakage\n"); |
| 1452 | write_lock(&neigh_tbl_lock); |
| 1453 | for (tp = &neigh_tables; *tp; tp = &(*tp)->next) { |
| 1454 | if (*tp == tbl) { |
| 1455 | *tp = tbl->next; |
| 1456 | break; |
| 1457 | } |
| 1458 | } |
| 1459 | write_unlock(&neigh_tbl_lock); |
| 1460 | |
| 1461 | neigh_hash_free(tbl->hash_buckets, tbl->hash_mask + 1); |
| 1462 | tbl->hash_buckets = NULL; |
| 1463 | |
| 1464 | kfree(tbl->phash_buckets); |
| 1465 | tbl->phash_buckets = NULL; |
| 1466 | |
Alexey Dobriyan | 3f192b5 | 2007-11-05 21:28:13 -0800 | [diff] [blame] | 1467 | remove_proc_entry(tbl->id, init_net.proc_net_stat); |
| 1468 | |
Kirill Korotaev | 3fcde74 | 2006-09-01 01:34:10 -0700 | [diff] [blame] | 1469 | free_percpu(tbl->stats); |
| 1470 | tbl->stats = NULL; |
| 1471 | |
Randy Dunlap | bfb85c9 | 2007-10-21 16:24:27 -0700 | [diff] [blame] | 1472 | kmem_cache_destroy(tbl->kmem_cachep); |
| 1473 | tbl->kmem_cachep = NULL; |
| 1474 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1475 | return 0; |
| 1476 | } |
| 1477 | |
Thomas Graf | c8822a4 | 2007-03-22 11:50:06 -0700 | [diff] [blame] | 1478 | static int neigh_delete(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1479 | { |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 1480 | struct net *net = skb->sk->sk_net; |
Thomas Graf | a14a49d | 2006-08-07 17:53:08 -0700 | [diff] [blame] | 1481 | struct ndmsg *ndm; |
| 1482 | struct nlattr *dst_attr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1483 | struct neigh_table *tbl; |
| 1484 | struct net_device *dev = NULL; |
Thomas Graf | a14a49d | 2006-08-07 17:53:08 -0700 | [diff] [blame] | 1485 | int err = -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1486 | |
Thomas Graf | a14a49d | 2006-08-07 17:53:08 -0700 | [diff] [blame] | 1487 | if (nlmsg_len(nlh) < sizeof(*ndm)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1488 | goto out; |
| 1489 | |
Thomas Graf | a14a49d | 2006-08-07 17:53:08 -0700 | [diff] [blame] | 1490 | dst_attr = nlmsg_find_attr(nlh, sizeof(*ndm), NDA_DST); |
| 1491 | if (dst_attr == NULL) |
| 1492 | goto out; |
| 1493 | |
| 1494 | ndm = nlmsg_data(nlh); |
| 1495 | if (ndm->ndm_ifindex) { |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 1496 | dev = dev_get_by_index(net, ndm->ndm_ifindex); |
Thomas Graf | a14a49d | 2006-08-07 17:53:08 -0700 | [diff] [blame] | 1497 | if (dev == NULL) { |
| 1498 | err = -ENODEV; |
| 1499 | goto out; |
| 1500 | } |
| 1501 | } |
| 1502 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1503 | read_lock(&neigh_tbl_lock); |
| 1504 | for (tbl = neigh_tables; tbl; tbl = tbl->next) { |
Thomas Graf | a14a49d | 2006-08-07 17:53:08 -0700 | [diff] [blame] | 1505 | struct neighbour *neigh; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1506 | |
| 1507 | if (tbl->family != ndm->ndm_family) |
| 1508 | continue; |
| 1509 | read_unlock(&neigh_tbl_lock); |
| 1510 | |
Thomas Graf | a14a49d | 2006-08-07 17:53:08 -0700 | [diff] [blame] | 1511 | if (nla_len(dst_attr) < tbl->key_len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1512 | goto out_dev_put; |
| 1513 | |
| 1514 | if (ndm->ndm_flags & NTF_PROXY) { |
Eric W. Biederman | 426b530 | 2008-01-24 00:13:18 -0800 | [diff] [blame] | 1515 | err = pneigh_delete(tbl, net, nla_data(dst_attr), dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1516 | goto out_dev_put; |
| 1517 | } |
| 1518 | |
Thomas Graf | a14a49d | 2006-08-07 17:53:08 -0700 | [diff] [blame] | 1519 | if (dev == NULL) |
| 1520 | goto out_dev_put; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1521 | |
Thomas Graf | a14a49d | 2006-08-07 17:53:08 -0700 | [diff] [blame] | 1522 | neigh = neigh_lookup(tbl, nla_data(dst_attr), dev); |
| 1523 | if (neigh == NULL) { |
| 1524 | err = -ENOENT; |
| 1525 | goto out_dev_put; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1526 | } |
Thomas Graf | a14a49d | 2006-08-07 17:53:08 -0700 | [diff] [blame] | 1527 | |
| 1528 | err = neigh_update(neigh, NULL, NUD_FAILED, |
| 1529 | NEIGH_UPDATE_F_OVERRIDE | |
| 1530 | NEIGH_UPDATE_F_ADMIN); |
| 1531 | neigh_release(neigh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1532 | goto out_dev_put; |
| 1533 | } |
| 1534 | read_unlock(&neigh_tbl_lock); |
Thomas Graf | a14a49d | 2006-08-07 17:53:08 -0700 | [diff] [blame] | 1535 | err = -EAFNOSUPPORT; |
| 1536 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1537 | out_dev_put: |
| 1538 | if (dev) |
| 1539 | dev_put(dev); |
| 1540 | out: |
| 1541 | return err; |
| 1542 | } |
| 1543 | |
Thomas Graf | c8822a4 | 2007-03-22 11:50:06 -0700 | [diff] [blame] | 1544 | static int neigh_add(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1545 | { |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 1546 | struct net *net = skb->sk->sk_net; |
Thomas Graf | 5208deb | 2006-08-07 17:55:40 -0700 | [diff] [blame] | 1547 | struct ndmsg *ndm; |
| 1548 | struct nlattr *tb[NDA_MAX+1]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1549 | struct neigh_table *tbl; |
| 1550 | struct net_device *dev = NULL; |
Thomas Graf | 5208deb | 2006-08-07 17:55:40 -0700 | [diff] [blame] | 1551 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1552 | |
Thomas Graf | 5208deb | 2006-08-07 17:55:40 -0700 | [diff] [blame] | 1553 | err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL); |
| 1554 | if (err < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1555 | goto out; |
| 1556 | |
Thomas Graf | 5208deb | 2006-08-07 17:55:40 -0700 | [diff] [blame] | 1557 | err = -EINVAL; |
| 1558 | if (tb[NDA_DST] == NULL) |
| 1559 | goto out; |
| 1560 | |
| 1561 | ndm = nlmsg_data(nlh); |
| 1562 | if (ndm->ndm_ifindex) { |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 1563 | dev = dev_get_by_index(net, ndm->ndm_ifindex); |
Thomas Graf | 5208deb | 2006-08-07 17:55:40 -0700 | [diff] [blame] | 1564 | if (dev == NULL) { |
| 1565 | err = -ENODEV; |
| 1566 | goto out; |
| 1567 | } |
| 1568 | |
| 1569 | if (tb[NDA_LLADDR] && nla_len(tb[NDA_LLADDR]) < dev->addr_len) |
| 1570 | goto out_dev_put; |
| 1571 | } |
| 1572 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1573 | read_lock(&neigh_tbl_lock); |
| 1574 | for (tbl = neigh_tables; tbl; tbl = tbl->next) { |
Thomas Graf | 5208deb | 2006-08-07 17:55:40 -0700 | [diff] [blame] | 1575 | int flags = NEIGH_UPDATE_F_ADMIN | NEIGH_UPDATE_F_OVERRIDE; |
| 1576 | struct neighbour *neigh; |
| 1577 | void *dst, *lladdr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1578 | |
| 1579 | if (tbl->family != ndm->ndm_family) |
| 1580 | continue; |
| 1581 | read_unlock(&neigh_tbl_lock); |
| 1582 | |
Thomas Graf | 5208deb | 2006-08-07 17:55:40 -0700 | [diff] [blame] | 1583 | if (nla_len(tb[NDA_DST]) < tbl->key_len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1584 | goto out_dev_put; |
Thomas Graf | 5208deb | 2006-08-07 17:55:40 -0700 | [diff] [blame] | 1585 | dst = nla_data(tb[NDA_DST]); |
| 1586 | lladdr = tb[NDA_LLADDR] ? nla_data(tb[NDA_LLADDR]) : NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1587 | |
| 1588 | if (ndm->ndm_flags & NTF_PROXY) { |
Ville Nuorvala | 62dd931 | 2006-09-22 14:43:19 -0700 | [diff] [blame] | 1589 | struct pneigh_entry *pn; |
| 1590 | |
| 1591 | err = -ENOBUFS; |
Eric W. Biederman | 426b530 | 2008-01-24 00:13:18 -0800 | [diff] [blame] | 1592 | pn = pneigh_lookup(tbl, net, dst, dev, 1); |
Ville Nuorvala | 62dd931 | 2006-09-22 14:43:19 -0700 | [diff] [blame] | 1593 | if (pn) { |
| 1594 | pn->flags = ndm->ndm_flags; |
| 1595 | err = 0; |
| 1596 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1597 | goto out_dev_put; |
| 1598 | } |
| 1599 | |
Thomas Graf | 5208deb | 2006-08-07 17:55:40 -0700 | [diff] [blame] | 1600 | if (dev == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1601 | goto out_dev_put; |
Thomas Graf | 5208deb | 2006-08-07 17:55:40 -0700 | [diff] [blame] | 1602 | |
| 1603 | neigh = neigh_lookup(tbl, dst, dev); |
| 1604 | if (neigh == NULL) { |
| 1605 | if (!(nlh->nlmsg_flags & NLM_F_CREATE)) { |
| 1606 | err = -ENOENT; |
| 1607 | goto out_dev_put; |
| 1608 | } |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1609 | |
Thomas Graf | 5208deb | 2006-08-07 17:55:40 -0700 | [diff] [blame] | 1610 | neigh = __neigh_lookup_errno(tbl, dst, dev); |
| 1611 | if (IS_ERR(neigh)) { |
| 1612 | err = PTR_ERR(neigh); |
| 1613 | goto out_dev_put; |
| 1614 | } |
| 1615 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1616 | if (nlh->nlmsg_flags & NLM_F_EXCL) { |
| 1617 | err = -EEXIST; |
Thomas Graf | 5208deb | 2006-08-07 17:55:40 -0700 | [diff] [blame] | 1618 | neigh_release(neigh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1619 | goto out_dev_put; |
| 1620 | } |
Thomas Graf | 5208deb | 2006-08-07 17:55:40 -0700 | [diff] [blame] | 1621 | |
| 1622 | if (!(nlh->nlmsg_flags & NLM_F_REPLACE)) |
| 1623 | flags &= ~NEIGH_UPDATE_F_OVERRIDE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1624 | } |
| 1625 | |
Thomas Graf | 5208deb | 2006-08-07 17:55:40 -0700 | [diff] [blame] | 1626 | err = neigh_update(neigh, lladdr, ndm->ndm_state, flags); |
| 1627 | neigh_release(neigh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1628 | goto out_dev_put; |
| 1629 | } |
| 1630 | |
| 1631 | read_unlock(&neigh_tbl_lock); |
Thomas Graf | 5208deb | 2006-08-07 17:55:40 -0700 | [diff] [blame] | 1632 | err = -EAFNOSUPPORT; |
| 1633 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1634 | out_dev_put: |
| 1635 | if (dev) |
| 1636 | dev_put(dev); |
| 1637 | out: |
| 1638 | return err; |
| 1639 | } |
| 1640 | |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1641 | static int neightbl_fill_parms(struct sk_buff *skb, struct neigh_parms *parms) |
| 1642 | { |
Thomas Graf | ca860fb | 2006-08-07 18:00:18 -0700 | [diff] [blame] | 1643 | struct nlattr *nest; |
| 1644 | |
| 1645 | nest = nla_nest_start(skb, NDTA_PARMS); |
| 1646 | if (nest == NULL) |
| 1647 | return -ENOBUFS; |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1648 | |
| 1649 | if (parms->dev) |
Thomas Graf | ca860fb | 2006-08-07 18:00:18 -0700 | [diff] [blame] | 1650 | NLA_PUT_U32(skb, NDTPA_IFINDEX, parms->dev->ifindex); |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1651 | |
Thomas Graf | ca860fb | 2006-08-07 18:00:18 -0700 | [diff] [blame] | 1652 | NLA_PUT_U32(skb, NDTPA_REFCNT, atomic_read(&parms->refcnt)); |
| 1653 | NLA_PUT_U32(skb, NDTPA_QUEUE_LEN, parms->queue_len); |
| 1654 | NLA_PUT_U32(skb, NDTPA_PROXY_QLEN, parms->proxy_qlen); |
| 1655 | NLA_PUT_U32(skb, NDTPA_APP_PROBES, parms->app_probes); |
| 1656 | NLA_PUT_U32(skb, NDTPA_UCAST_PROBES, parms->ucast_probes); |
| 1657 | NLA_PUT_U32(skb, NDTPA_MCAST_PROBES, parms->mcast_probes); |
| 1658 | NLA_PUT_MSECS(skb, NDTPA_REACHABLE_TIME, parms->reachable_time); |
| 1659 | NLA_PUT_MSECS(skb, NDTPA_BASE_REACHABLE_TIME, |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1660 | parms->base_reachable_time); |
Thomas Graf | ca860fb | 2006-08-07 18:00:18 -0700 | [diff] [blame] | 1661 | NLA_PUT_MSECS(skb, NDTPA_GC_STALETIME, parms->gc_staletime); |
| 1662 | NLA_PUT_MSECS(skb, NDTPA_DELAY_PROBE_TIME, parms->delay_probe_time); |
| 1663 | NLA_PUT_MSECS(skb, NDTPA_RETRANS_TIME, parms->retrans_time); |
| 1664 | NLA_PUT_MSECS(skb, NDTPA_ANYCAST_DELAY, parms->anycast_delay); |
| 1665 | NLA_PUT_MSECS(skb, NDTPA_PROXY_DELAY, parms->proxy_delay); |
| 1666 | NLA_PUT_MSECS(skb, NDTPA_LOCKTIME, parms->locktime); |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1667 | |
Thomas Graf | ca860fb | 2006-08-07 18:00:18 -0700 | [diff] [blame] | 1668 | return nla_nest_end(skb, nest); |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1669 | |
Thomas Graf | ca860fb | 2006-08-07 18:00:18 -0700 | [diff] [blame] | 1670 | nla_put_failure: |
| 1671 | return nla_nest_cancel(skb, nest); |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1672 | } |
| 1673 | |
Thomas Graf | ca860fb | 2006-08-07 18:00:18 -0700 | [diff] [blame] | 1674 | static int neightbl_fill_info(struct sk_buff *skb, struct neigh_table *tbl, |
| 1675 | u32 pid, u32 seq, int type, int flags) |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1676 | { |
| 1677 | struct nlmsghdr *nlh; |
| 1678 | struct ndtmsg *ndtmsg; |
| 1679 | |
Thomas Graf | ca860fb | 2006-08-07 18:00:18 -0700 | [diff] [blame] | 1680 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndtmsg), flags); |
| 1681 | if (nlh == NULL) |
Patrick McHardy | 2693256 | 2007-01-31 23:16:40 -0800 | [diff] [blame] | 1682 | return -EMSGSIZE; |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1683 | |
Thomas Graf | ca860fb | 2006-08-07 18:00:18 -0700 | [diff] [blame] | 1684 | ndtmsg = nlmsg_data(nlh); |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1685 | |
| 1686 | read_lock_bh(&tbl->lock); |
| 1687 | ndtmsg->ndtm_family = tbl->family; |
Patrick McHardy | 9ef1d4c | 2005-06-28 12:55:30 -0700 | [diff] [blame] | 1688 | ndtmsg->ndtm_pad1 = 0; |
| 1689 | ndtmsg->ndtm_pad2 = 0; |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1690 | |
Thomas Graf | ca860fb | 2006-08-07 18:00:18 -0700 | [diff] [blame] | 1691 | NLA_PUT_STRING(skb, NDTA_NAME, tbl->id); |
| 1692 | NLA_PUT_MSECS(skb, NDTA_GC_INTERVAL, tbl->gc_interval); |
| 1693 | NLA_PUT_U32(skb, NDTA_THRESH1, tbl->gc_thresh1); |
| 1694 | NLA_PUT_U32(skb, NDTA_THRESH2, tbl->gc_thresh2); |
| 1695 | NLA_PUT_U32(skb, NDTA_THRESH3, tbl->gc_thresh3); |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1696 | |
| 1697 | { |
| 1698 | unsigned long now = jiffies; |
| 1699 | unsigned int flush_delta = now - tbl->last_flush; |
| 1700 | unsigned int rand_delta = now - tbl->last_rand; |
| 1701 | |
| 1702 | struct ndt_config ndc = { |
| 1703 | .ndtc_key_len = tbl->key_len, |
| 1704 | .ndtc_entry_size = tbl->entry_size, |
| 1705 | .ndtc_entries = atomic_read(&tbl->entries), |
| 1706 | .ndtc_last_flush = jiffies_to_msecs(flush_delta), |
| 1707 | .ndtc_last_rand = jiffies_to_msecs(rand_delta), |
| 1708 | .ndtc_hash_rnd = tbl->hash_rnd, |
| 1709 | .ndtc_hash_mask = tbl->hash_mask, |
| 1710 | .ndtc_hash_chain_gc = tbl->hash_chain_gc, |
| 1711 | .ndtc_proxy_qlen = tbl->proxy_queue.qlen, |
| 1712 | }; |
| 1713 | |
Thomas Graf | ca860fb | 2006-08-07 18:00:18 -0700 | [diff] [blame] | 1714 | NLA_PUT(skb, NDTA_CONFIG, sizeof(ndc), &ndc); |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1715 | } |
| 1716 | |
| 1717 | { |
| 1718 | int cpu; |
| 1719 | struct ndt_stats ndst; |
| 1720 | |
| 1721 | memset(&ndst, 0, sizeof(ndst)); |
| 1722 | |
KAMEZAWA Hiroyuki | 6f91204 | 2006-04-10 22:52:50 -0700 | [diff] [blame] | 1723 | for_each_possible_cpu(cpu) { |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1724 | struct neigh_statistics *st; |
| 1725 | |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1726 | st = per_cpu_ptr(tbl->stats, cpu); |
| 1727 | ndst.ndts_allocs += st->allocs; |
| 1728 | ndst.ndts_destroys += st->destroys; |
| 1729 | ndst.ndts_hash_grows += st->hash_grows; |
| 1730 | ndst.ndts_res_failed += st->res_failed; |
| 1731 | ndst.ndts_lookups += st->lookups; |
| 1732 | ndst.ndts_hits += st->hits; |
| 1733 | ndst.ndts_rcv_probes_mcast += st->rcv_probes_mcast; |
| 1734 | ndst.ndts_rcv_probes_ucast += st->rcv_probes_ucast; |
| 1735 | ndst.ndts_periodic_gc_runs += st->periodic_gc_runs; |
| 1736 | ndst.ndts_forced_gc_runs += st->forced_gc_runs; |
| 1737 | } |
| 1738 | |
Thomas Graf | ca860fb | 2006-08-07 18:00:18 -0700 | [diff] [blame] | 1739 | NLA_PUT(skb, NDTA_STATS, sizeof(ndst), &ndst); |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1740 | } |
| 1741 | |
| 1742 | BUG_ON(tbl->parms.dev); |
| 1743 | if (neightbl_fill_parms(skb, &tbl->parms) < 0) |
Thomas Graf | ca860fb | 2006-08-07 18:00:18 -0700 | [diff] [blame] | 1744 | goto nla_put_failure; |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1745 | |
| 1746 | read_unlock_bh(&tbl->lock); |
Thomas Graf | ca860fb | 2006-08-07 18:00:18 -0700 | [diff] [blame] | 1747 | return nlmsg_end(skb, nlh); |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1748 | |
Thomas Graf | ca860fb | 2006-08-07 18:00:18 -0700 | [diff] [blame] | 1749 | nla_put_failure: |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1750 | read_unlock_bh(&tbl->lock); |
Patrick McHardy | 2693256 | 2007-01-31 23:16:40 -0800 | [diff] [blame] | 1751 | nlmsg_cancel(skb, nlh); |
| 1752 | return -EMSGSIZE; |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1753 | } |
| 1754 | |
Thomas Graf | ca860fb | 2006-08-07 18:00:18 -0700 | [diff] [blame] | 1755 | static int neightbl_fill_param_info(struct sk_buff *skb, |
| 1756 | struct neigh_table *tbl, |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1757 | struct neigh_parms *parms, |
Thomas Graf | ca860fb | 2006-08-07 18:00:18 -0700 | [diff] [blame] | 1758 | u32 pid, u32 seq, int type, |
| 1759 | unsigned int flags) |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1760 | { |
| 1761 | struct ndtmsg *ndtmsg; |
| 1762 | struct nlmsghdr *nlh; |
| 1763 | |
Thomas Graf | ca860fb | 2006-08-07 18:00:18 -0700 | [diff] [blame] | 1764 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndtmsg), flags); |
| 1765 | if (nlh == NULL) |
Patrick McHardy | 2693256 | 2007-01-31 23:16:40 -0800 | [diff] [blame] | 1766 | return -EMSGSIZE; |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1767 | |
Thomas Graf | ca860fb | 2006-08-07 18:00:18 -0700 | [diff] [blame] | 1768 | ndtmsg = nlmsg_data(nlh); |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1769 | |
| 1770 | read_lock_bh(&tbl->lock); |
| 1771 | ndtmsg->ndtm_family = tbl->family; |
Patrick McHardy | 9ef1d4c | 2005-06-28 12:55:30 -0700 | [diff] [blame] | 1772 | ndtmsg->ndtm_pad1 = 0; |
| 1773 | ndtmsg->ndtm_pad2 = 0; |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1774 | |
Thomas Graf | ca860fb | 2006-08-07 18:00:18 -0700 | [diff] [blame] | 1775 | if (nla_put_string(skb, NDTA_NAME, tbl->id) < 0 || |
| 1776 | neightbl_fill_parms(skb, parms) < 0) |
| 1777 | goto errout; |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1778 | |
| 1779 | read_unlock_bh(&tbl->lock); |
Thomas Graf | ca860fb | 2006-08-07 18:00:18 -0700 | [diff] [blame] | 1780 | return nlmsg_end(skb, nlh); |
| 1781 | errout: |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1782 | read_unlock_bh(&tbl->lock); |
Patrick McHardy | 2693256 | 2007-01-31 23:16:40 -0800 | [diff] [blame] | 1783 | nlmsg_cancel(skb, nlh); |
| 1784 | return -EMSGSIZE; |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1785 | } |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1786 | |
Patrick McHardy | ef7c79e | 2007-06-05 12:38:30 -0700 | [diff] [blame] | 1787 | static const struct nla_policy nl_neightbl_policy[NDTA_MAX+1] = { |
Thomas Graf | 6b3f867 | 2006-08-07 17:58:53 -0700 | [diff] [blame] | 1788 | [NDTA_NAME] = { .type = NLA_STRING }, |
| 1789 | [NDTA_THRESH1] = { .type = NLA_U32 }, |
| 1790 | [NDTA_THRESH2] = { .type = NLA_U32 }, |
| 1791 | [NDTA_THRESH3] = { .type = NLA_U32 }, |
| 1792 | [NDTA_GC_INTERVAL] = { .type = NLA_U64 }, |
| 1793 | [NDTA_PARMS] = { .type = NLA_NESTED }, |
| 1794 | }; |
| 1795 | |
Patrick McHardy | ef7c79e | 2007-06-05 12:38:30 -0700 | [diff] [blame] | 1796 | static const struct nla_policy nl_ntbl_parm_policy[NDTPA_MAX+1] = { |
Thomas Graf | 6b3f867 | 2006-08-07 17:58:53 -0700 | [diff] [blame] | 1797 | [NDTPA_IFINDEX] = { .type = NLA_U32 }, |
| 1798 | [NDTPA_QUEUE_LEN] = { .type = NLA_U32 }, |
| 1799 | [NDTPA_PROXY_QLEN] = { .type = NLA_U32 }, |
| 1800 | [NDTPA_APP_PROBES] = { .type = NLA_U32 }, |
| 1801 | [NDTPA_UCAST_PROBES] = { .type = NLA_U32 }, |
| 1802 | [NDTPA_MCAST_PROBES] = { .type = NLA_U32 }, |
| 1803 | [NDTPA_BASE_REACHABLE_TIME] = { .type = NLA_U64 }, |
| 1804 | [NDTPA_GC_STALETIME] = { .type = NLA_U64 }, |
| 1805 | [NDTPA_DELAY_PROBE_TIME] = { .type = NLA_U64 }, |
| 1806 | [NDTPA_RETRANS_TIME] = { .type = NLA_U64 }, |
| 1807 | [NDTPA_ANYCAST_DELAY] = { .type = NLA_U64 }, |
| 1808 | [NDTPA_PROXY_DELAY] = { .type = NLA_U64 }, |
| 1809 | [NDTPA_LOCKTIME] = { .type = NLA_U64 }, |
| 1810 | }; |
| 1811 | |
Thomas Graf | c8822a4 | 2007-03-22 11:50:06 -0700 | [diff] [blame] | 1812 | static int neightbl_set(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1813 | { |
Denis V. Lunev | b854272 | 2007-12-01 00:21:31 +1100 | [diff] [blame] | 1814 | struct net *net = skb->sk->sk_net; |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1815 | struct neigh_table *tbl; |
Thomas Graf | 6b3f867 | 2006-08-07 17:58:53 -0700 | [diff] [blame] | 1816 | struct ndtmsg *ndtmsg; |
| 1817 | struct nlattr *tb[NDTA_MAX+1]; |
| 1818 | int err; |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1819 | |
Thomas Graf | 6b3f867 | 2006-08-07 17:58:53 -0700 | [diff] [blame] | 1820 | err = nlmsg_parse(nlh, sizeof(*ndtmsg), tb, NDTA_MAX, |
| 1821 | nl_neightbl_policy); |
| 1822 | if (err < 0) |
| 1823 | goto errout; |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1824 | |
Thomas Graf | 6b3f867 | 2006-08-07 17:58:53 -0700 | [diff] [blame] | 1825 | if (tb[NDTA_NAME] == NULL) { |
| 1826 | err = -EINVAL; |
| 1827 | goto errout; |
| 1828 | } |
| 1829 | |
| 1830 | ndtmsg = nlmsg_data(nlh); |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1831 | read_lock(&neigh_tbl_lock); |
| 1832 | for (tbl = neigh_tables; tbl; tbl = tbl->next) { |
| 1833 | if (ndtmsg->ndtm_family && tbl->family != ndtmsg->ndtm_family) |
| 1834 | continue; |
| 1835 | |
Thomas Graf | 6b3f867 | 2006-08-07 17:58:53 -0700 | [diff] [blame] | 1836 | if (nla_strcmp(tb[NDTA_NAME], tbl->id) == 0) |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1837 | break; |
| 1838 | } |
| 1839 | |
| 1840 | if (tbl == NULL) { |
| 1841 | err = -ENOENT; |
Thomas Graf | 6b3f867 | 2006-08-07 17:58:53 -0700 | [diff] [blame] | 1842 | goto errout_locked; |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1843 | } |
| 1844 | |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1845 | /* |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1846 | * We acquire tbl->lock to be nice to the periodic timers and |
| 1847 | * make sure they always see a consistent set of values. |
| 1848 | */ |
| 1849 | write_lock_bh(&tbl->lock); |
| 1850 | |
Thomas Graf | 6b3f867 | 2006-08-07 17:58:53 -0700 | [diff] [blame] | 1851 | if (tb[NDTA_PARMS]) { |
| 1852 | struct nlattr *tbp[NDTPA_MAX+1]; |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1853 | struct neigh_parms *p; |
Thomas Graf | 6b3f867 | 2006-08-07 17:58:53 -0700 | [diff] [blame] | 1854 | int i, ifindex = 0; |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1855 | |
Thomas Graf | 6b3f867 | 2006-08-07 17:58:53 -0700 | [diff] [blame] | 1856 | err = nla_parse_nested(tbp, NDTPA_MAX, tb[NDTA_PARMS], |
| 1857 | nl_ntbl_parm_policy); |
| 1858 | if (err < 0) |
| 1859 | goto errout_tbl_lock; |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1860 | |
Thomas Graf | 6b3f867 | 2006-08-07 17:58:53 -0700 | [diff] [blame] | 1861 | if (tbp[NDTPA_IFINDEX]) |
| 1862 | ifindex = nla_get_u32(tbp[NDTPA_IFINDEX]); |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1863 | |
Eric W. Biederman | 426b530 | 2008-01-24 00:13:18 -0800 | [diff] [blame] | 1864 | p = lookup_neigh_params(tbl, net, ifindex); |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1865 | if (p == NULL) { |
| 1866 | err = -ENOENT; |
Thomas Graf | 6b3f867 | 2006-08-07 17:58:53 -0700 | [diff] [blame] | 1867 | goto errout_tbl_lock; |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1868 | } |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1869 | |
Thomas Graf | 6b3f867 | 2006-08-07 17:58:53 -0700 | [diff] [blame] | 1870 | for (i = 1; i <= NDTPA_MAX; i++) { |
| 1871 | if (tbp[i] == NULL) |
| 1872 | continue; |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1873 | |
Thomas Graf | 6b3f867 | 2006-08-07 17:58:53 -0700 | [diff] [blame] | 1874 | switch (i) { |
| 1875 | case NDTPA_QUEUE_LEN: |
| 1876 | p->queue_len = nla_get_u32(tbp[i]); |
| 1877 | break; |
| 1878 | case NDTPA_PROXY_QLEN: |
| 1879 | p->proxy_qlen = nla_get_u32(tbp[i]); |
| 1880 | break; |
| 1881 | case NDTPA_APP_PROBES: |
| 1882 | p->app_probes = nla_get_u32(tbp[i]); |
| 1883 | break; |
| 1884 | case NDTPA_UCAST_PROBES: |
| 1885 | p->ucast_probes = nla_get_u32(tbp[i]); |
| 1886 | break; |
| 1887 | case NDTPA_MCAST_PROBES: |
| 1888 | p->mcast_probes = nla_get_u32(tbp[i]); |
| 1889 | break; |
| 1890 | case NDTPA_BASE_REACHABLE_TIME: |
| 1891 | p->base_reachable_time = nla_get_msecs(tbp[i]); |
| 1892 | break; |
| 1893 | case NDTPA_GC_STALETIME: |
| 1894 | p->gc_staletime = nla_get_msecs(tbp[i]); |
| 1895 | break; |
| 1896 | case NDTPA_DELAY_PROBE_TIME: |
| 1897 | p->delay_probe_time = nla_get_msecs(tbp[i]); |
| 1898 | break; |
| 1899 | case NDTPA_RETRANS_TIME: |
| 1900 | p->retrans_time = nla_get_msecs(tbp[i]); |
| 1901 | break; |
| 1902 | case NDTPA_ANYCAST_DELAY: |
| 1903 | p->anycast_delay = nla_get_msecs(tbp[i]); |
| 1904 | break; |
| 1905 | case NDTPA_PROXY_DELAY: |
| 1906 | p->proxy_delay = nla_get_msecs(tbp[i]); |
| 1907 | break; |
| 1908 | case NDTPA_LOCKTIME: |
| 1909 | p->locktime = nla_get_msecs(tbp[i]); |
| 1910 | break; |
| 1911 | } |
| 1912 | } |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1913 | } |
| 1914 | |
Thomas Graf | 6b3f867 | 2006-08-07 17:58:53 -0700 | [diff] [blame] | 1915 | if (tb[NDTA_THRESH1]) |
| 1916 | tbl->gc_thresh1 = nla_get_u32(tb[NDTA_THRESH1]); |
| 1917 | |
| 1918 | if (tb[NDTA_THRESH2]) |
| 1919 | tbl->gc_thresh2 = nla_get_u32(tb[NDTA_THRESH2]); |
| 1920 | |
| 1921 | if (tb[NDTA_THRESH3]) |
| 1922 | tbl->gc_thresh3 = nla_get_u32(tb[NDTA_THRESH3]); |
| 1923 | |
| 1924 | if (tb[NDTA_GC_INTERVAL]) |
| 1925 | tbl->gc_interval = nla_get_msecs(tb[NDTA_GC_INTERVAL]); |
| 1926 | |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1927 | err = 0; |
| 1928 | |
Thomas Graf | 6b3f867 | 2006-08-07 17:58:53 -0700 | [diff] [blame] | 1929 | errout_tbl_lock: |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1930 | write_unlock_bh(&tbl->lock); |
Thomas Graf | 6b3f867 | 2006-08-07 17:58:53 -0700 | [diff] [blame] | 1931 | errout_locked: |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1932 | read_unlock(&neigh_tbl_lock); |
Thomas Graf | 6b3f867 | 2006-08-07 17:58:53 -0700 | [diff] [blame] | 1933 | errout: |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1934 | return err; |
| 1935 | } |
| 1936 | |
Thomas Graf | c8822a4 | 2007-03-22 11:50:06 -0700 | [diff] [blame] | 1937 | static int neightbl_dump_info(struct sk_buff *skb, struct netlink_callback *cb) |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1938 | { |
Denis V. Lunev | b854272 | 2007-12-01 00:21:31 +1100 | [diff] [blame] | 1939 | struct net *net = skb->sk->sk_net; |
Thomas Graf | ca860fb | 2006-08-07 18:00:18 -0700 | [diff] [blame] | 1940 | int family, tidx, nidx = 0; |
| 1941 | int tbl_skip = cb->args[0]; |
| 1942 | int neigh_skip = cb->args[1]; |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1943 | struct neigh_table *tbl; |
| 1944 | |
Thomas Graf | ca860fb | 2006-08-07 18:00:18 -0700 | [diff] [blame] | 1945 | family = ((struct rtgenmsg *) nlmsg_data(cb->nlh))->rtgen_family; |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1946 | |
| 1947 | read_lock(&neigh_tbl_lock); |
Thomas Graf | ca860fb | 2006-08-07 18:00:18 -0700 | [diff] [blame] | 1948 | for (tbl = neigh_tables, tidx = 0; tbl; tbl = tbl->next, tidx++) { |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1949 | struct neigh_parms *p; |
| 1950 | |
Thomas Graf | ca860fb | 2006-08-07 18:00:18 -0700 | [diff] [blame] | 1951 | if (tidx < tbl_skip || (family && tbl->family != family)) |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1952 | continue; |
| 1953 | |
Thomas Graf | ca860fb | 2006-08-07 18:00:18 -0700 | [diff] [blame] | 1954 | if (neightbl_fill_info(skb, tbl, NETLINK_CB(cb->skb).pid, |
| 1955 | cb->nlh->nlmsg_seq, RTM_NEWNEIGHTBL, |
| 1956 | NLM_F_MULTI) <= 0) |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1957 | break; |
| 1958 | |
Eric W. Biederman | 426b530 | 2008-01-24 00:13:18 -0800 | [diff] [blame] | 1959 | for (nidx = 0, p = tbl->parms.next; p; p = p->next) { |
| 1960 | if (net != p->net) |
| 1961 | continue; |
| 1962 | |
| 1963 | if (nidx++ < neigh_skip) |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1964 | continue; |
| 1965 | |
Thomas Graf | ca860fb | 2006-08-07 18:00:18 -0700 | [diff] [blame] | 1966 | if (neightbl_fill_param_info(skb, tbl, p, |
| 1967 | NETLINK_CB(cb->skb).pid, |
| 1968 | cb->nlh->nlmsg_seq, |
| 1969 | RTM_NEWNEIGHTBL, |
| 1970 | NLM_F_MULTI) <= 0) |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1971 | goto out; |
| 1972 | } |
| 1973 | |
Thomas Graf | ca860fb | 2006-08-07 18:00:18 -0700 | [diff] [blame] | 1974 | neigh_skip = 0; |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1975 | } |
| 1976 | out: |
| 1977 | read_unlock(&neigh_tbl_lock); |
Thomas Graf | ca860fb | 2006-08-07 18:00:18 -0700 | [diff] [blame] | 1978 | cb->args[0] = tidx; |
| 1979 | cb->args[1] = nidx; |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1980 | |
| 1981 | return skb->len; |
| 1982 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1983 | |
Thomas Graf | 8b8aec5 | 2006-08-07 17:56:37 -0700 | [diff] [blame] | 1984 | static int neigh_fill_info(struct sk_buff *skb, struct neighbour *neigh, |
| 1985 | u32 pid, u32 seq, int type, unsigned int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1986 | { |
| 1987 | unsigned long now = jiffies; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1988 | struct nda_cacheinfo ci; |
Thomas Graf | 8b8aec5 | 2006-08-07 17:56:37 -0700 | [diff] [blame] | 1989 | struct nlmsghdr *nlh; |
| 1990 | struct ndmsg *ndm; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1991 | |
Thomas Graf | 8b8aec5 | 2006-08-07 17:56:37 -0700 | [diff] [blame] | 1992 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), flags); |
| 1993 | if (nlh == NULL) |
Patrick McHardy | 2693256 | 2007-01-31 23:16:40 -0800 | [diff] [blame] | 1994 | return -EMSGSIZE; |
Thomas Graf | 8b8aec5 | 2006-08-07 17:56:37 -0700 | [diff] [blame] | 1995 | |
| 1996 | ndm = nlmsg_data(nlh); |
| 1997 | ndm->ndm_family = neigh->ops->family; |
Patrick McHardy | 9ef1d4c | 2005-06-28 12:55:30 -0700 | [diff] [blame] | 1998 | ndm->ndm_pad1 = 0; |
| 1999 | ndm->ndm_pad2 = 0; |
Thomas Graf | 8b8aec5 | 2006-08-07 17:56:37 -0700 | [diff] [blame] | 2000 | ndm->ndm_flags = neigh->flags; |
| 2001 | ndm->ndm_type = neigh->type; |
| 2002 | ndm->ndm_ifindex = neigh->dev->ifindex; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2003 | |
Thomas Graf | 8b8aec5 | 2006-08-07 17:56:37 -0700 | [diff] [blame] | 2004 | NLA_PUT(skb, NDA_DST, neigh->tbl->key_len, neigh->primary_key); |
| 2005 | |
| 2006 | read_lock_bh(&neigh->lock); |
| 2007 | ndm->ndm_state = neigh->nud_state; |
| 2008 | if ((neigh->nud_state & NUD_VALID) && |
| 2009 | nla_put(skb, NDA_LLADDR, neigh->dev->addr_len, neigh->ha) < 0) { |
| 2010 | read_unlock_bh(&neigh->lock); |
| 2011 | goto nla_put_failure; |
| 2012 | } |
| 2013 | |
| 2014 | ci.ndm_used = now - neigh->used; |
| 2015 | ci.ndm_confirmed = now - neigh->confirmed; |
| 2016 | ci.ndm_updated = now - neigh->updated; |
| 2017 | ci.ndm_refcnt = atomic_read(&neigh->refcnt) - 1; |
| 2018 | read_unlock_bh(&neigh->lock); |
| 2019 | |
| 2020 | NLA_PUT_U32(skb, NDA_PROBES, atomic_read(&neigh->probes)); |
| 2021 | NLA_PUT(skb, NDA_CACHEINFO, sizeof(ci), &ci); |
| 2022 | |
| 2023 | return nlmsg_end(skb, nlh); |
| 2024 | |
| 2025 | nla_put_failure: |
Patrick McHardy | 2693256 | 2007-01-31 23:16:40 -0800 | [diff] [blame] | 2026 | nlmsg_cancel(skb, nlh); |
| 2027 | return -EMSGSIZE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2028 | } |
| 2029 | |
Thomas Graf | d961db3 | 2007-08-08 23:12:56 -0700 | [diff] [blame] | 2030 | static void neigh_update_notify(struct neighbour *neigh) |
| 2031 | { |
| 2032 | call_netevent_notifiers(NETEVENT_NEIGH_UPDATE, neigh); |
| 2033 | __neigh_notify(neigh, RTM_NEWNEIGH, 0); |
| 2034 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2035 | |
| 2036 | static int neigh_dump_table(struct neigh_table *tbl, struct sk_buff *skb, |
| 2037 | struct netlink_callback *cb) |
| 2038 | { |
Eric W. Biederman | 426b530 | 2008-01-24 00:13:18 -0800 | [diff] [blame] | 2039 | struct net * net = skb->sk->sk_net; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2040 | struct neighbour *n; |
| 2041 | int rc, h, s_h = cb->args[1]; |
| 2042 | int idx, s_idx = idx = cb->args[2]; |
| 2043 | |
Julian Anastasov | c5e2946 | 2006-10-03 15:49:46 -0700 | [diff] [blame] | 2044 | read_lock_bh(&tbl->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2045 | for (h = 0; h <= tbl->hash_mask; h++) { |
| 2046 | if (h < s_h) |
| 2047 | continue; |
| 2048 | if (h > s_h) |
| 2049 | s_idx = 0; |
Eric W. Biederman | 426b530 | 2008-01-24 00:13:18 -0800 | [diff] [blame] | 2050 | for (n = tbl->hash_buckets[h], idx = 0; n; n = n->next) { |
| 2051 | int lidx; |
| 2052 | if (n->dev->nd_net != net) |
| 2053 | continue; |
| 2054 | lidx = idx++; |
| 2055 | if (lidx < s_idx) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2056 | continue; |
| 2057 | if (neigh_fill_info(skb, n, NETLINK_CB(cb->skb).pid, |
| 2058 | cb->nlh->nlmsg_seq, |
Jamal Hadi Salim | b6544c0 | 2005-06-18 22:54:12 -0700 | [diff] [blame] | 2059 | RTM_NEWNEIGH, |
| 2060 | NLM_F_MULTI) <= 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2061 | read_unlock_bh(&tbl->lock); |
| 2062 | rc = -1; |
| 2063 | goto out; |
| 2064 | } |
| 2065 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2066 | } |
Julian Anastasov | c5e2946 | 2006-10-03 15:49:46 -0700 | [diff] [blame] | 2067 | read_unlock_bh(&tbl->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2068 | rc = skb->len; |
| 2069 | out: |
| 2070 | cb->args[1] = h; |
| 2071 | cb->args[2] = idx; |
| 2072 | return rc; |
| 2073 | } |
| 2074 | |
Thomas Graf | c8822a4 | 2007-03-22 11:50:06 -0700 | [diff] [blame] | 2075 | static int neigh_dump_info(struct sk_buff *skb, struct netlink_callback *cb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2076 | { |
| 2077 | struct neigh_table *tbl; |
| 2078 | int t, family, s_t; |
| 2079 | |
| 2080 | read_lock(&neigh_tbl_lock); |
Thomas Graf | 8b8aec5 | 2006-08-07 17:56:37 -0700 | [diff] [blame] | 2081 | family = ((struct rtgenmsg *) nlmsg_data(cb->nlh))->rtgen_family; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2082 | s_t = cb->args[0]; |
| 2083 | |
| 2084 | for (tbl = neigh_tables, t = 0; tbl; tbl = tbl->next, t++) { |
| 2085 | if (t < s_t || (family && tbl->family != family)) |
| 2086 | continue; |
| 2087 | if (t > s_t) |
| 2088 | memset(&cb->args[1], 0, sizeof(cb->args) - |
| 2089 | sizeof(cb->args[0])); |
| 2090 | if (neigh_dump_table(tbl, skb, cb) < 0) |
| 2091 | break; |
| 2092 | } |
| 2093 | read_unlock(&neigh_tbl_lock); |
| 2094 | |
| 2095 | cb->args[0] = t; |
| 2096 | return skb->len; |
| 2097 | } |
| 2098 | |
| 2099 | void neigh_for_each(struct neigh_table *tbl, void (*cb)(struct neighbour *, void *), void *cookie) |
| 2100 | { |
| 2101 | int chain; |
| 2102 | |
| 2103 | read_lock_bh(&tbl->lock); |
| 2104 | for (chain = 0; chain <= tbl->hash_mask; chain++) { |
| 2105 | struct neighbour *n; |
| 2106 | |
| 2107 | for (n = tbl->hash_buckets[chain]; n; n = n->next) |
| 2108 | cb(n, cookie); |
| 2109 | } |
| 2110 | read_unlock_bh(&tbl->lock); |
| 2111 | } |
| 2112 | EXPORT_SYMBOL(neigh_for_each); |
| 2113 | |
| 2114 | /* The tbl->lock must be held as a writer and BH disabled. */ |
| 2115 | void __neigh_for_each_release(struct neigh_table *tbl, |
| 2116 | int (*cb)(struct neighbour *)) |
| 2117 | { |
| 2118 | int chain; |
| 2119 | |
| 2120 | for (chain = 0; chain <= tbl->hash_mask; chain++) { |
| 2121 | struct neighbour *n, **np; |
| 2122 | |
| 2123 | np = &tbl->hash_buckets[chain]; |
| 2124 | while ((n = *np) != NULL) { |
| 2125 | int release; |
| 2126 | |
| 2127 | write_lock(&n->lock); |
| 2128 | release = cb(n); |
| 2129 | if (release) { |
| 2130 | *np = n->next; |
| 2131 | n->dead = 1; |
| 2132 | } else |
| 2133 | np = &n->next; |
| 2134 | write_unlock(&n->lock); |
Thomas Graf | 4f49455 | 2007-08-08 23:12:36 -0700 | [diff] [blame] | 2135 | if (release) |
| 2136 | neigh_cleanup_and_release(n); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2137 | } |
| 2138 | } |
| 2139 | } |
| 2140 | EXPORT_SYMBOL(__neigh_for_each_release); |
| 2141 | |
| 2142 | #ifdef CONFIG_PROC_FS |
| 2143 | |
| 2144 | static struct neighbour *neigh_get_first(struct seq_file *seq) |
| 2145 | { |
| 2146 | struct neigh_seq_state *state = seq->private; |
Denis V. Lunev | 4250846 | 2008-01-10 03:53:12 -0800 | [diff] [blame] | 2147 | struct net *net = state->p.net; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2148 | struct neigh_table *tbl = state->tbl; |
| 2149 | struct neighbour *n = NULL; |
| 2150 | int bucket = state->bucket; |
| 2151 | |
| 2152 | state->flags &= ~NEIGH_SEQ_IS_PNEIGH; |
| 2153 | for (bucket = 0; bucket <= tbl->hash_mask; bucket++) { |
| 2154 | n = tbl->hash_buckets[bucket]; |
| 2155 | |
| 2156 | while (n) { |
Eric W. Biederman | 426b530 | 2008-01-24 00:13:18 -0800 | [diff] [blame] | 2157 | if (n->dev->nd_net != net) |
| 2158 | goto next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2159 | if (state->neigh_sub_iter) { |
| 2160 | loff_t fakep = 0; |
| 2161 | void *v; |
| 2162 | |
| 2163 | v = state->neigh_sub_iter(state, n, &fakep); |
| 2164 | if (!v) |
| 2165 | goto next; |
| 2166 | } |
| 2167 | if (!(state->flags & NEIGH_SEQ_SKIP_NOARP)) |
| 2168 | break; |
| 2169 | if (n->nud_state & ~NUD_NOARP) |
| 2170 | break; |
| 2171 | next: |
| 2172 | n = n->next; |
| 2173 | } |
| 2174 | |
| 2175 | if (n) |
| 2176 | break; |
| 2177 | } |
| 2178 | state->bucket = bucket; |
| 2179 | |
| 2180 | return n; |
| 2181 | } |
| 2182 | |
| 2183 | static struct neighbour *neigh_get_next(struct seq_file *seq, |
| 2184 | struct neighbour *n, |
| 2185 | loff_t *pos) |
| 2186 | { |
| 2187 | struct neigh_seq_state *state = seq->private; |
Denis V. Lunev | 4250846 | 2008-01-10 03:53:12 -0800 | [diff] [blame] | 2188 | struct net *net = state->p.net; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2189 | struct neigh_table *tbl = state->tbl; |
| 2190 | |
| 2191 | if (state->neigh_sub_iter) { |
| 2192 | void *v = state->neigh_sub_iter(state, n, pos); |
| 2193 | if (v) |
| 2194 | return n; |
| 2195 | } |
| 2196 | n = n->next; |
| 2197 | |
| 2198 | while (1) { |
| 2199 | while (n) { |
Eric W. Biederman | 426b530 | 2008-01-24 00:13:18 -0800 | [diff] [blame] | 2200 | if (n->dev->nd_net != net) |
| 2201 | goto next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2202 | if (state->neigh_sub_iter) { |
| 2203 | void *v = state->neigh_sub_iter(state, n, pos); |
| 2204 | if (v) |
| 2205 | return n; |
| 2206 | goto next; |
| 2207 | } |
| 2208 | if (!(state->flags & NEIGH_SEQ_SKIP_NOARP)) |
| 2209 | break; |
| 2210 | |
| 2211 | if (n->nud_state & ~NUD_NOARP) |
| 2212 | break; |
| 2213 | next: |
| 2214 | n = n->next; |
| 2215 | } |
| 2216 | |
| 2217 | if (n) |
| 2218 | break; |
| 2219 | |
| 2220 | if (++state->bucket > tbl->hash_mask) |
| 2221 | break; |
| 2222 | |
| 2223 | n = tbl->hash_buckets[state->bucket]; |
| 2224 | } |
| 2225 | |
| 2226 | if (n && pos) |
| 2227 | --(*pos); |
| 2228 | return n; |
| 2229 | } |
| 2230 | |
| 2231 | static struct neighbour *neigh_get_idx(struct seq_file *seq, loff_t *pos) |
| 2232 | { |
| 2233 | struct neighbour *n = neigh_get_first(seq); |
| 2234 | |
| 2235 | if (n) { |
| 2236 | while (*pos) { |
| 2237 | n = neigh_get_next(seq, n, pos); |
| 2238 | if (!n) |
| 2239 | break; |
| 2240 | } |
| 2241 | } |
| 2242 | return *pos ? NULL : n; |
| 2243 | } |
| 2244 | |
| 2245 | static struct pneigh_entry *pneigh_get_first(struct seq_file *seq) |
| 2246 | { |
| 2247 | struct neigh_seq_state *state = seq->private; |
Denis V. Lunev | 4250846 | 2008-01-10 03:53:12 -0800 | [diff] [blame] | 2248 | struct net * net = state->p.net; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2249 | struct neigh_table *tbl = state->tbl; |
| 2250 | struct pneigh_entry *pn = NULL; |
| 2251 | int bucket = state->bucket; |
| 2252 | |
| 2253 | state->flags |= NEIGH_SEQ_IS_PNEIGH; |
| 2254 | for (bucket = 0; bucket <= PNEIGH_HASHMASK; bucket++) { |
| 2255 | pn = tbl->phash_buckets[bucket]; |
Eric W. Biederman | 426b530 | 2008-01-24 00:13:18 -0800 | [diff] [blame] | 2256 | while (pn && (pn->net != net)) |
| 2257 | pn = pn->next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2258 | if (pn) |
| 2259 | break; |
| 2260 | } |
| 2261 | state->bucket = bucket; |
| 2262 | |
| 2263 | return pn; |
| 2264 | } |
| 2265 | |
| 2266 | static struct pneigh_entry *pneigh_get_next(struct seq_file *seq, |
| 2267 | struct pneigh_entry *pn, |
| 2268 | loff_t *pos) |
| 2269 | { |
| 2270 | struct neigh_seq_state *state = seq->private; |
Denis V. Lunev | 4250846 | 2008-01-10 03:53:12 -0800 | [diff] [blame] | 2271 | struct net * net = state->p.net; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2272 | struct neigh_table *tbl = state->tbl; |
| 2273 | |
| 2274 | pn = pn->next; |
| 2275 | while (!pn) { |
| 2276 | if (++state->bucket > PNEIGH_HASHMASK) |
| 2277 | break; |
| 2278 | pn = tbl->phash_buckets[state->bucket]; |
Eric W. Biederman | 426b530 | 2008-01-24 00:13:18 -0800 | [diff] [blame] | 2279 | while (pn && (pn->net != net)) |
| 2280 | pn = pn->next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2281 | if (pn) |
| 2282 | break; |
| 2283 | } |
| 2284 | |
| 2285 | if (pn && pos) |
| 2286 | --(*pos); |
| 2287 | |
| 2288 | return pn; |
| 2289 | } |
| 2290 | |
| 2291 | static struct pneigh_entry *pneigh_get_idx(struct seq_file *seq, loff_t *pos) |
| 2292 | { |
| 2293 | struct pneigh_entry *pn = pneigh_get_first(seq); |
| 2294 | |
| 2295 | if (pn) { |
| 2296 | while (*pos) { |
| 2297 | pn = pneigh_get_next(seq, pn, pos); |
| 2298 | if (!pn) |
| 2299 | break; |
| 2300 | } |
| 2301 | } |
| 2302 | return *pos ? NULL : pn; |
| 2303 | } |
| 2304 | |
| 2305 | static void *neigh_get_idx_any(struct seq_file *seq, loff_t *pos) |
| 2306 | { |
| 2307 | struct neigh_seq_state *state = seq->private; |
| 2308 | void *rc; |
| 2309 | |
| 2310 | rc = neigh_get_idx(seq, pos); |
| 2311 | if (!rc && !(state->flags & NEIGH_SEQ_NEIGH_ONLY)) |
| 2312 | rc = pneigh_get_idx(seq, pos); |
| 2313 | |
| 2314 | return rc; |
| 2315 | } |
| 2316 | |
| 2317 | void *neigh_seq_start(struct seq_file *seq, loff_t *pos, struct neigh_table *tbl, unsigned int neigh_seq_flags) |
Eric Dumazet | 9a429c4 | 2008-01-01 21:58:02 -0800 | [diff] [blame] | 2318 | __acquires(tbl->lock) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2319 | { |
| 2320 | struct neigh_seq_state *state = seq->private; |
| 2321 | loff_t pos_minus_one; |
| 2322 | |
| 2323 | state->tbl = tbl; |
| 2324 | state->bucket = 0; |
| 2325 | state->flags = (neigh_seq_flags & ~NEIGH_SEQ_IS_PNEIGH); |
| 2326 | |
| 2327 | read_lock_bh(&tbl->lock); |
| 2328 | |
| 2329 | pos_minus_one = *pos - 1; |
| 2330 | return *pos ? neigh_get_idx_any(seq, &pos_minus_one) : SEQ_START_TOKEN; |
| 2331 | } |
| 2332 | EXPORT_SYMBOL(neigh_seq_start); |
| 2333 | |
| 2334 | void *neigh_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| 2335 | { |
| 2336 | struct neigh_seq_state *state; |
| 2337 | void *rc; |
| 2338 | |
| 2339 | if (v == SEQ_START_TOKEN) { |
| 2340 | rc = neigh_get_idx(seq, pos); |
| 2341 | goto out; |
| 2342 | } |
| 2343 | |
| 2344 | state = seq->private; |
| 2345 | if (!(state->flags & NEIGH_SEQ_IS_PNEIGH)) { |
| 2346 | rc = neigh_get_next(seq, v, NULL); |
| 2347 | if (rc) |
| 2348 | goto out; |
| 2349 | if (!(state->flags & NEIGH_SEQ_NEIGH_ONLY)) |
| 2350 | rc = pneigh_get_first(seq); |
| 2351 | } else { |
| 2352 | BUG_ON(state->flags & NEIGH_SEQ_NEIGH_ONLY); |
| 2353 | rc = pneigh_get_next(seq, v, NULL); |
| 2354 | } |
| 2355 | out: |
| 2356 | ++(*pos); |
| 2357 | return rc; |
| 2358 | } |
| 2359 | EXPORT_SYMBOL(neigh_seq_next); |
| 2360 | |
| 2361 | void neigh_seq_stop(struct seq_file *seq, void *v) |
Eric Dumazet | 9a429c4 | 2008-01-01 21:58:02 -0800 | [diff] [blame] | 2362 | __releases(tbl->lock) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2363 | { |
| 2364 | struct neigh_seq_state *state = seq->private; |
| 2365 | struct neigh_table *tbl = state->tbl; |
| 2366 | |
| 2367 | read_unlock_bh(&tbl->lock); |
| 2368 | } |
| 2369 | EXPORT_SYMBOL(neigh_seq_stop); |
| 2370 | |
| 2371 | /* statistics via seq_file */ |
| 2372 | |
| 2373 | static void *neigh_stat_seq_start(struct seq_file *seq, loff_t *pos) |
| 2374 | { |
| 2375 | struct proc_dir_entry *pde = seq->private; |
| 2376 | struct neigh_table *tbl = pde->data; |
| 2377 | int cpu; |
| 2378 | |
| 2379 | if (*pos == 0) |
| 2380 | return SEQ_START_TOKEN; |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 2381 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2382 | for (cpu = *pos-1; cpu < NR_CPUS; ++cpu) { |
| 2383 | if (!cpu_possible(cpu)) |
| 2384 | continue; |
| 2385 | *pos = cpu+1; |
| 2386 | return per_cpu_ptr(tbl->stats, cpu); |
| 2387 | } |
| 2388 | return NULL; |
| 2389 | } |
| 2390 | |
| 2391 | static void *neigh_stat_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| 2392 | { |
| 2393 | struct proc_dir_entry *pde = seq->private; |
| 2394 | struct neigh_table *tbl = pde->data; |
| 2395 | int cpu; |
| 2396 | |
| 2397 | for (cpu = *pos; cpu < NR_CPUS; ++cpu) { |
| 2398 | if (!cpu_possible(cpu)) |
| 2399 | continue; |
| 2400 | *pos = cpu+1; |
| 2401 | return per_cpu_ptr(tbl->stats, cpu); |
| 2402 | } |
| 2403 | return NULL; |
| 2404 | } |
| 2405 | |
| 2406 | static void neigh_stat_seq_stop(struct seq_file *seq, void *v) |
| 2407 | { |
| 2408 | |
| 2409 | } |
| 2410 | |
| 2411 | static int neigh_stat_seq_show(struct seq_file *seq, void *v) |
| 2412 | { |
| 2413 | struct proc_dir_entry *pde = seq->private; |
| 2414 | struct neigh_table *tbl = pde->data; |
| 2415 | struct neigh_statistics *st = v; |
| 2416 | |
| 2417 | if (v == SEQ_START_TOKEN) { |
Olaf Rempel | 5bec003 | 2005-04-28 12:16:08 -0700 | [diff] [blame] | 2418 | seq_printf(seq, "entries allocs destroys hash_grows lookups hits res_failed rcv_probes_mcast rcv_probes_ucast periodic_gc_runs forced_gc_runs\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2419 | return 0; |
| 2420 | } |
| 2421 | |
| 2422 | seq_printf(seq, "%08x %08lx %08lx %08lx %08lx %08lx %08lx " |
| 2423 | "%08lx %08lx %08lx %08lx\n", |
| 2424 | atomic_read(&tbl->entries), |
| 2425 | |
| 2426 | st->allocs, |
| 2427 | st->destroys, |
| 2428 | st->hash_grows, |
| 2429 | |
| 2430 | st->lookups, |
| 2431 | st->hits, |
| 2432 | |
| 2433 | st->res_failed, |
| 2434 | |
| 2435 | st->rcv_probes_mcast, |
| 2436 | st->rcv_probes_ucast, |
| 2437 | |
| 2438 | st->periodic_gc_runs, |
| 2439 | st->forced_gc_runs |
| 2440 | ); |
| 2441 | |
| 2442 | return 0; |
| 2443 | } |
| 2444 | |
Stephen Hemminger | f690808 | 2007-03-12 14:34:29 -0700 | [diff] [blame] | 2445 | static const struct seq_operations neigh_stat_seq_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2446 | .start = neigh_stat_seq_start, |
| 2447 | .next = neigh_stat_seq_next, |
| 2448 | .stop = neigh_stat_seq_stop, |
| 2449 | .show = neigh_stat_seq_show, |
| 2450 | }; |
| 2451 | |
| 2452 | static int neigh_stat_seq_open(struct inode *inode, struct file *file) |
| 2453 | { |
| 2454 | int ret = seq_open(file, &neigh_stat_seq_ops); |
| 2455 | |
| 2456 | if (!ret) { |
| 2457 | struct seq_file *sf = file->private_data; |
| 2458 | sf->private = PDE(inode); |
| 2459 | } |
| 2460 | return ret; |
| 2461 | }; |
| 2462 | |
Arjan van de Ven | 9a32144 | 2007-02-12 00:55:35 -0800 | [diff] [blame] | 2463 | static const struct file_operations neigh_stat_seq_fops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2464 | .owner = THIS_MODULE, |
| 2465 | .open = neigh_stat_seq_open, |
| 2466 | .read = seq_read, |
| 2467 | .llseek = seq_lseek, |
| 2468 | .release = seq_release, |
| 2469 | }; |
| 2470 | |
| 2471 | #endif /* CONFIG_PROC_FS */ |
| 2472 | |
Thomas Graf | 339bf98 | 2006-11-10 14:10:15 -0800 | [diff] [blame] | 2473 | static inline size_t neigh_nlmsg_size(void) |
| 2474 | { |
| 2475 | return NLMSG_ALIGN(sizeof(struct ndmsg)) |
| 2476 | + nla_total_size(MAX_ADDR_LEN) /* NDA_DST */ |
| 2477 | + nla_total_size(MAX_ADDR_LEN) /* NDA_LLADDR */ |
| 2478 | + nla_total_size(sizeof(struct nda_cacheinfo)) |
| 2479 | + nla_total_size(4); /* NDA_PROBES */ |
| 2480 | } |
| 2481 | |
Thomas Graf | b867331 | 2006-08-15 00:33:14 -0700 | [diff] [blame] | 2482 | static void __neigh_notify(struct neighbour *n, int type, int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2483 | { |
Eric W. Biederman | 426b530 | 2008-01-24 00:13:18 -0800 | [diff] [blame] | 2484 | struct net *net = n->dev->nd_net; |
Thomas Graf | 8b8aec5 | 2006-08-07 17:56:37 -0700 | [diff] [blame] | 2485 | struct sk_buff *skb; |
Thomas Graf | b867331 | 2006-08-15 00:33:14 -0700 | [diff] [blame] | 2486 | int err = -ENOBUFS; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2487 | |
Thomas Graf | 339bf98 | 2006-11-10 14:10:15 -0800 | [diff] [blame] | 2488 | skb = nlmsg_new(neigh_nlmsg_size(), GFP_ATOMIC); |
Thomas Graf | 8b8aec5 | 2006-08-07 17:56:37 -0700 | [diff] [blame] | 2489 | if (skb == NULL) |
Thomas Graf | b867331 | 2006-08-15 00:33:14 -0700 | [diff] [blame] | 2490 | goto errout; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2491 | |
Thomas Graf | b867331 | 2006-08-15 00:33:14 -0700 | [diff] [blame] | 2492 | err = neigh_fill_info(skb, n, 0, 0, type, flags); |
Patrick McHardy | 2693256 | 2007-01-31 23:16:40 -0800 | [diff] [blame] | 2493 | if (err < 0) { |
| 2494 | /* -EMSGSIZE implies BUG in neigh_nlmsg_size() */ |
| 2495 | WARN_ON(err == -EMSGSIZE); |
| 2496 | kfree_skb(skb); |
| 2497 | goto errout; |
| 2498 | } |
Eric W. Biederman | 426b530 | 2008-01-24 00:13:18 -0800 | [diff] [blame] | 2499 | err = rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC); |
Thomas Graf | b867331 | 2006-08-15 00:33:14 -0700 | [diff] [blame] | 2500 | errout: |
| 2501 | if (err < 0) |
Eric W. Biederman | 426b530 | 2008-01-24 00:13:18 -0800 | [diff] [blame] | 2502 | rtnl_set_sk_err(net, RTNLGRP_NEIGH, err); |
Thomas Graf | b867331 | 2006-08-15 00:33:14 -0700 | [diff] [blame] | 2503 | } |
| 2504 | |
Thomas Graf | d961db3 | 2007-08-08 23:12:56 -0700 | [diff] [blame] | 2505 | #ifdef CONFIG_ARPD |
Thomas Graf | b867331 | 2006-08-15 00:33:14 -0700 | [diff] [blame] | 2506 | void neigh_app_ns(struct neighbour *n) |
| 2507 | { |
| 2508 | __neigh_notify(n, RTM_GETNEIGH, NLM_F_REQUEST); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2509 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2510 | #endif /* CONFIG_ARPD */ |
| 2511 | |
| 2512 | #ifdef CONFIG_SYSCTL |
| 2513 | |
| 2514 | static struct neigh_sysctl_table { |
| 2515 | struct ctl_table_header *sysctl_header; |
Pavel Emelyanov | c3bac5a | 2007-12-02 00:08:16 +1100 | [diff] [blame] | 2516 | struct ctl_table neigh_vars[__NET_NEIGH_MAX]; |
| 2517 | char *dev_name; |
Brian Haley | ab32ea5 | 2006-09-22 14:15:41 -0700 | [diff] [blame] | 2518 | } neigh_sysctl_template __read_mostly = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2519 | .neigh_vars = { |
| 2520 | { |
| 2521 | .ctl_name = NET_NEIGH_MCAST_SOLICIT, |
| 2522 | .procname = "mcast_solicit", |
| 2523 | .maxlen = sizeof(int), |
| 2524 | .mode = 0644, |
| 2525 | .proc_handler = &proc_dointvec, |
| 2526 | }, |
| 2527 | { |
| 2528 | .ctl_name = NET_NEIGH_UCAST_SOLICIT, |
| 2529 | .procname = "ucast_solicit", |
| 2530 | .maxlen = sizeof(int), |
| 2531 | .mode = 0644, |
| 2532 | .proc_handler = &proc_dointvec, |
| 2533 | }, |
| 2534 | { |
| 2535 | .ctl_name = NET_NEIGH_APP_SOLICIT, |
| 2536 | .procname = "app_solicit", |
| 2537 | .maxlen = sizeof(int), |
| 2538 | .mode = 0644, |
| 2539 | .proc_handler = &proc_dointvec, |
| 2540 | }, |
| 2541 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2542 | .procname = "retrans_time", |
| 2543 | .maxlen = sizeof(int), |
| 2544 | .mode = 0644, |
| 2545 | .proc_handler = &proc_dointvec_userhz_jiffies, |
| 2546 | }, |
| 2547 | { |
| 2548 | .ctl_name = NET_NEIGH_REACHABLE_TIME, |
| 2549 | .procname = "base_reachable_time", |
| 2550 | .maxlen = sizeof(int), |
| 2551 | .mode = 0644, |
| 2552 | .proc_handler = &proc_dointvec_jiffies, |
| 2553 | .strategy = &sysctl_jiffies, |
| 2554 | }, |
| 2555 | { |
| 2556 | .ctl_name = NET_NEIGH_DELAY_PROBE_TIME, |
| 2557 | .procname = "delay_first_probe_time", |
| 2558 | .maxlen = sizeof(int), |
| 2559 | .mode = 0644, |
| 2560 | .proc_handler = &proc_dointvec_jiffies, |
| 2561 | .strategy = &sysctl_jiffies, |
| 2562 | }, |
| 2563 | { |
| 2564 | .ctl_name = NET_NEIGH_GC_STALE_TIME, |
| 2565 | .procname = "gc_stale_time", |
| 2566 | .maxlen = sizeof(int), |
| 2567 | .mode = 0644, |
| 2568 | .proc_handler = &proc_dointvec_jiffies, |
| 2569 | .strategy = &sysctl_jiffies, |
| 2570 | }, |
| 2571 | { |
| 2572 | .ctl_name = NET_NEIGH_UNRES_QLEN, |
| 2573 | .procname = "unres_qlen", |
| 2574 | .maxlen = sizeof(int), |
| 2575 | .mode = 0644, |
| 2576 | .proc_handler = &proc_dointvec, |
| 2577 | }, |
| 2578 | { |
| 2579 | .ctl_name = NET_NEIGH_PROXY_QLEN, |
| 2580 | .procname = "proxy_qlen", |
| 2581 | .maxlen = sizeof(int), |
| 2582 | .mode = 0644, |
| 2583 | .proc_handler = &proc_dointvec, |
| 2584 | }, |
| 2585 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2586 | .procname = "anycast_delay", |
| 2587 | .maxlen = sizeof(int), |
| 2588 | .mode = 0644, |
| 2589 | .proc_handler = &proc_dointvec_userhz_jiffies, |
| 2590 | }, |
| 2591 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2592 | .procname = "proxy_delay", |
| 2593 | .maxlen = sizeof(int), |
| 2594 | .mode = 0644, |
| 2595 | .proc_handler = &proc_dointvec_userhz_jiffies, |
| 2596 | }, |
| 2597 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2598 | .procname = "locktime", |
| 2599 | .maxlen = sizeof(int), |
| 2600 | .mode = 0644, |
| 2601 | .proc_handler = &proc_dointvec_userhz_jiffies, |
| 2602 | }, |
| 2603 | { |
Eric W. Biederman | d12af67 | 2007-10-18 03:05:25 -0700 | [diff] [blame] | 2604 | .ctl_name = NET_NEIGH_RETRANS_TIME_MS, |
| 2605 | .procname = "retrans_time_ms", |
| 2606 | .maxlen = sizeof(int), |
| 2607 | .mode = 0644, |
| 2608 | .proc_handler = &proc_dointvec_ms_jiffies, |
| 2609 | .strategy = &sysctl_ms_jiffies, |
| 2610 | }, |
| 2611 | { |
| 2612 | .ctl_name = NET_NEIGH_REACHABLE_TIME_MS, |
| 2613 | .procname = "base_reachable_time_ms", |
| 2614 | .maxlen = sizeof(int), |
| 2615 | .mode = 0644, |
| 2616 | .proc_handler = &proc_dointvec_ms_jiffies, |
| 2617 | .strategy = &sysctl_ms_jiffies, |
| 2618 | }, |
| 2619 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2620 | .ctl_name = NET_NEIGH_GC_INTERVAL, |
| 2621 | .procname = "gc_interval", |
| 2622 | .maxlen = sizeof(int), |
| 2623 | .mode = 0644, |
| 2624 | .proc_handler = &proc_dointvec_jiffies, |
| 2625 | .strategy = &sysctl_jiffies, |
| 2626 | }, |
| 2627 | { |
| 2628 | .ctl_name = NET_NEIGH_GC_THRESH1, |
| 2629 | .procname = "gc_thresh1", |
| 2630 | .maxlen = sizeof(int), |
| 2631 | .mode = 0644, |
| 2632 | .proc_handler = &proc_dointvec, |
| 2633 | }, |
| 2634 | { |
| 2635 | .ctl_name = NET_NEIGH_GC_THRESH2, |
| 2636 | .procname = "gc_thresh2", |
| 2637 | .maxlen = sizeof(int), |
| 2638 | .mode = 0644, |
| 2639 | .proc_handler = &proc_dointvec, |
| 2640 | }, |
| 2641 | { |
| 2642 | .ctl_name = NET_NEIGH_GC_THRESH3, |
| 2643 | .procname = "gc_thresh3", |
| 2644 | .maxlen = sizeof(int), |
| 2645 | .mode = 0644, |
| 2646 | .proc_handler = &proc_dointvec, |
| 2647 | }, |
Pavel Emelyanov | c3bac5a | 2007-12-02 00:08:16 +1100 | [diff] [blame] | 2648 | {}, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2649 | }, |
| 2650 | }; |
| 2651 | |
| 2652 | int neigh_sysctl_register(struct net_device *dev, struct neigh_parms *p, |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 2653 | int p_id, int pdev_id, char *p_name, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2654 | proc_handler *handler, ctl_handler *strategy) |
| 2655 | { |
Pavel Emelyanov | 3c607bb | 2007-12-02 00:06:34 +1100 | [diff] [blame] | 2656 | struct neigh_sysctl_table *t; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2657 | const char *dev_name_source = NULL; |
Pavel Emelyanov | c3bac5a | 2007-12-02 00:08:16 +1100 | [diff] [blame] | 2658 | |
| 2659 | #define NEIGH_CTL_PATH_ROOT 0 |
| 2660 | #define NEIGH_CTL_PATH_PROTO 1 |
| 2661 | #define NEIGH_CTL_PATH_NEIGH 2 |
| 2662 | #define NEIGH_CTL_PATH_DEV 3 |
| 2663 | |
| 2664 | struct ctl_path neigh_path[] = { |
| 2665 | { .procname = "net", .ctl_name = CTL_NET, }, |
| 2666 | { .procname = "proto", .ctl_name = 0, }, |
| 2667 | { .procname = "neigh", .ctl_name = 0, }, |
| 2668 | { .procname = "default", .ctl_name = NET_PROTO_CONF_DEFAULT, }, |
| 2669 | { }, |
| 2670 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2671 | |
Pavel Emelyanov | 3c607bb | 2007-12-02 00:06:34 +1100 | [diff] [blame] | 2672 | t = kmemdup(&neigh_sysctl_template, sizeof(*t), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2673 | if (!t) |
Pavel Emelyanov | 3c607bb | 2007-12-02 00:06:34 +1100 | [diff] [blame] | 2674 | goto err; |
| 2675 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2676 | t->neigh_vars[0].data = &p->mcast_probes; |
| 2677 | t->neigh_vars[1].data = &p->ucast_probes; |
| 2678 | t->neigh_vars[2].data = &p->app_probes; |
| 2679 | t->neigh_vars[3].data = &p->retrans_time; |
| 2680 | t->neigh_vars[4].data = &p->base_reachable_time; |
| 2681 | t->neigh_vars[5].data = &p->delay_probe_time; |
| 2682 | t->neigh_vars[6].data = &p->gc_staletime; |
| 2683 | t->neigh_vars[7].data = &p->queue_len; |
| 2684 | t->neigh_vars[8].data = &p->proxy_qlen; |
| 2685 | t->neigh_vars[9].data = &p->anycast_delay; |
| 2686 | t->neigh_vars[10].data = &p->proxy_delay; |
| 2687 | t->neigh_vars[11].data = &p->locktime; |
Eric W. Biederman | d12af67 | 2007-10-18 03:05:25 -0700 | [diff] [blame] | 2688 | t->neigh_vars[12].data = &p->retrans_time; |
| 2689 | t->neigh_vars[13].data = &p->base_reachable_time; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2690 | |
| 2691 | if (dev) { |
| 2692 | dev_name_source = dev->name; |
Pavel Emelyanov | c3bac5a | 2007-12-02 00:08:16 +1100 | [diff] [blame] | 2693 | neigh_path[NEIGH_CTL_PATH_DEV].ctl_name = dev->ifindex; |
Eric W. Biederman | d12af67 | 2007-10-18 03:05:25 -0700 | [diff] [blame] | 2694 | /* Terminate the table early */ |
| 2695 | memset(&t->neigh_vars[14], 0, sizeof(t->neigh_vars[14])); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2696 | } else { |
Pavel Emelyanov | c3bac5a | 2007-12-02 00:08:16 +1100 | [diff] [blame] | 2697 | dev_name_source = neigh_path[NEIGH_CTL_PATH_DEV].procname; |
Eric W. Biederman | d12af67 | 2007-10-18 03:05:25 -0700 | [diff] [blame] | 2698 | t->neigh_vars[14].data = (int *)(p + 1); |
| 2699 | t->neigh_vars[15].data = (int *)(p + 1) + 1; |
| 2700 | t->neigh_vars[16].data = (int *)(p + 1) + 2; |
| 2701 | t->neigh_vars[17].data = (int *)(p + 1) + 3; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2702 | } |
| 2703 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2704 | |
| 2705 | if (handler || strategy) { |
| 2706 | /* RetransTime */ |
| 2707 | t->neigh_vars[3].proc_handler = handler; |
| 2708 | t->neigh_vars[3].strategy = strategy; |
| 2709 | t->neigh_vars[3].extra1 = dev; |
Eric W. Biederman | d12af67 | 2007-10-18 03:05:25 -0700 | [diff] [blame] | 2710 | if (!strategy) |
| 2711 | t->neigh_vars[3].ctl_name = CTL_UNNUMBERED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2712 | /* ReachableTime */ |
| 2713 | t->neigh_vars[4].proc_handler = handler; |
| 2714 | t->neigh_vars[4].strategy = strategy; |
| 2715 | t->neigh_vars[4].extra1 = dev; |
Eric W. Biederman | d12af67 | 2007-10-18 03:05:25 -0700 | [diff] [blame] | 2716 | if (!strategy) |
| 2717 | t->neigh_vars[4].ctl_name = CTL_UNNUMBERED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2718 | /* RetransTime (in milliseconds)*/ |
Eric W. Biederman | d12af67 | 2007-10-18 03:05:25 -0700 | [diff] [blame] | 2719 | t->neigh_vars[12].proc_handler = handler; |
| 2720 | t->neigh_vars[12].strategy = strategy; |
| 2721 | t->neigh_vars[12].extra1 = dev; |
| 2722 | if (!strategy) |
| 2723 | t->neigh_vars[12].ctl_name = CTL_UNNUMBERED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2724 | /* ReachableTime (in milliseconds) */ |
Eric W. Biederman | d12af67 | 2007-10-18 03:05:25 -0700 | [diff] [blame] | 2725 | t->neigh_vars[13].proc_handler = handler; |
| 2726 | t->neigh_vars[13].strategy = strategy; |
| 2727 | t->neigh_vars[13].extra1 = dev; |
| 2728 | if (!strategy) |
| 2729 | t->neigh_vars[13].ctl_name = CTL_UNNUMBERED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2730 | } |
| 2731 | |
Pavel Emelyanov | c3bac5a | 2007-12-02 00:08:16 +1100 | [diff] [blame] | 2732 | t->dev_name = kstrdup(dev_name_source, GFP_KERNEL); |
| 2733 | if (!t->dev_name) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2734 | goto free; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2735 | |
Pavel Emelyanov | c3bac5a | 2007-12-02 00:08:16 +1100 | [diff] [blame] | 2736 | neigh_path[NEIGH_CTL_PATH_DEV].procname = t->dev_name; |
| 2737 | neigh_path[NEIGH_CTL_PATH_NEIGH].ctl_name = pdev_id; |
| 2738 | neigh_path[NEIGH_CTL_PATH_PROTO].procname = p_name; |
| 2739 | neigh_path[NEIGH_CTL_PATH_PROTO].ctl_name = p_id; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2740 | |
Pavel Emelyanov | c3bac5a | 2007-12-02 00:08:16 +1100 | [diff] [blame] | 2741 | t->sysctl_header = register_sysctl_paths(neigh_path, t->neigh_vars); |
Pavel Emelyanov | 3c607bb | 2007-12-02 00:06:34 +1100 | [diff] [blame] | 2742 | if (!t->sysctl_header) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2743 | goto free_procname; |
Pavel Emelyanov | 3c607bb | 2007-12-02 00:06:34 +1100 | [diff] [blame] | 2744 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2745 | p->sysctl_table = t; |
| 2746 | return 0; |
| 2747 | |
Pavel Emelyanov | 3c607bb | 2007-12-02 00:06:34 +1100 | [diff] [blame] | 2748 | free_procname: |
Pavel Emelyanov | c3bac5a | 2007-12-02 00:08:16 +1100 | [diff] [blame] | 2749 | kfree(t->dev_name); |
Pavel Emelyanov | 3c607bb | 2007-12-02 00:06:34 +1100 | [diff] [blame] | 2750 | free: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2751 | kfree(t); |
Pavel Emelyanov | 3c607bb | 2007-12-02 00:06:34 +1100 | [diff] [blame] | 2752 | err: |
| 2753 | return -ENOBUFS; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2754 | } |
| 2755 | |
| 2756 | void neigh_sysctl_unregister(struct neigh_parms *p) |
| 2757 | { |
| 2758 | if (p->sysctl_table) { |
| 2759 | struct neigh_sysctl_table *t = p->sysctl_table; |
| 2760 | p->sysctl_table = NULL; |
| 2761 | unregister_sysctl_table(t->sysctl_header); |
Pavel Emelyanov | c3bac5a | 2007-12-02 00:08:16 +1100 | [diff] [blame] | 2762 | kfree(t->dev_name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2763 | kfree(t); |
| 2764 | } |
| 2765 | } |
| 2766 | |
| 2767 | #endif /* CONFIG_SYSCTL */ |
| 2768 | |
Thomas Graf | c8822a4 | 2007-03-22 11:50:06 -0700 | [diff] [blame] | 2769 | static int __init neigh_init(void) |
| 2770 | { |
| 2771 | rtnl_register(PF_UNSPEC, RTM_NEWNEIGH, neigh_add, NULL); |
| 2772 | rtnl_register(PF_UNSPEC, RTM_DELNEIGH, neigh_delete, NULL); |
| 2773 | rtnl_register(PF_UNSPEC, RTM_GETNEIGH, NULL, neigh_dump_info); |
| 2774 | |
| 2775 | rtnl_register(PF_UNSPEC, RTM_GETNEIGHTBL, NULL, neightbl_dump_info); |
| 2776 | rtnl_register(PF_UNSPEC, RTM_SETNEIGHTBL, neightbl_set, NULL); |
| 2777 | |
| 2778 | return 0; |
| 2779 | } |
| 2780 | |
| 2781 | subsys_initcall(neigh_init); |
| 2782 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2783 | EXPORT_SYMBOL(__neigh_event_send); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2784 | EXPORT_SYMBOL(neigh_changeaddr); |
| 2785 | EXPORT_SYMBOL(neigh_compat_output); |
| 2786 | EXPORT_SYMBOL(neigh_connected_output); |
| 2787 | EXPORT_SYMBOL(neigh_create); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2788 | EXPORT_SYMBOL(neigh_destroy); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2789 | EXPORT_SYMBOL(neigh_event_ns); |
| 2790 | EXPORT_SYMBOL(neigh_ifdown); |
| 2791 | EXPORT_SYMBOL(neigh_lookup); |
| 2792 | EXPORT_SYMBOL(neigh_lookup_nodev); |
| 2793 | EXPORT_SYMBOL(neigh_parms_alloc); |
| 2794 | EXPORT_SYMBOL(neigh_parms_release); |
| 2795 | EXPORT_SYMBOL(neigh_rand_reach_time); |
| 2796 | EXPORT_SYMBOL(neigh_resolve_output); |
| 2797 | EXPORT_SYMBOL(neigh_table_clear); |
| 2798 | EXPORT_SYMBOL(neigh_table_init); |
Simon Kelley | bd89efc | 2006-05-12 14:56:08 -0700 | [diff] [blame] | 2799 | EXPORT_SYMBOL(neigh_table_init_no_netlink); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2800 | EXPORT_SYMBOL(neigh_update); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2801 | EXPORT_SYMBOL(pneigh_enqueue); |
| 2802 | EXPORT_SYMBOL(pneigh_lookup); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2803 | |
| 2804 | #ifdef CONFIG_ARPD |
| 2805 | EXPORT_SYMBOL(neigh_app_ns); |
| 2806 | #endif |
| 2807 | #ifdef CONFIG_SYSCTL |
| 2808 | EXPORT_SYMBOL(neigh_sysctl_register); |
| 2809 | EXPORT_SYMBOL(neigh_sysctl_unregister); |
| 2810 | #endif |