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 | |
Joe Perches | e005d19 | 2012-05-16 19:58:40 +0000 | [diff] [blame] | 18 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| 19 | |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 20 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | #include <linux/types.h> |
| 22 | #include <linux/kernel.h> |
| 23 | #include <linux/module.h> |
| 24 | #include <linux/socket.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | #include <linux/netdevice.h> |
| 26 | #include <linux/proc_fs.h> |
| 27 | #ifdef CONFIG_SYSCTL |
| 28 | #include <linux/sysctl.h> |
| 29 | #endif |
| 30 | #include <linux/times.h> |
Eric W. Biederman | 457c4cb | 2007-09-12 12:01:34 +0200 | [diff] [blame] | 31 | #include <net/net_namespace.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | #include <net/neighbour.h> |
| 33 | #include <net/dst.h> |
| 34 | #include <net/sock.h> |
Tom Tucker | 8d71740 | 2006-07-30 20:43:36 -0700 | [diff] [blame] | 35 | #include <net/netevent.h> |
Thomas Graf | a14a49d | 2006-08-07 17:53:08 -0700 | [diff] [blame] | 36 | #include <net/netlink.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | #include <linux/rtnetlink.h> |
| 38 | #include <linux/random.h> |
Paulo Marques | 543537b | 2005-06-23 00:09:02 -0700 | [diff] [blame] | 39 | #include <linux/string.h> |
vignesh babu | c3609d5 | 2007-08-24 22:27:55 -0700 | [diff] [blame] | 40 | #include <linux/log2.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | |
Joe Perches | d5d427c | 2013-04-15 15:17:19 +0000 | [diff] [blame] | 42 | #define DEBUG |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | #define NEIGH_DEBUG 1 |
Joe Perches | d5d427c | 2013-04-15 15:17:19 +0000 | [diff] [blame] | 44 | #define neigh_dbg(level, fmt, ...) \ |
| 45 | do { \ |
| 46 | if (level <= NEIGH_DEBUG) \ |
| 47 | pr_debug(fmt, ##__VA_ARGS__); \ |
| 48 | } while (0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | |
| 50 | #define PNEIGH_HASHMASK 0xF |
| 51 | |
| 52 | static void neigh_timer_handler(unsigned long arg); |
Thomas Graf | d961db3 | 2007-08-08 23:12:56 -0700 | [diff] [blame] | 53 | static void __neigh_notify(struct neighbour *n, int type, int flags); |
| 54 | static void neigh_update_notify(struct neighbour *neigh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 55 | static int pneigh_ifdown(struct neigh_table *tbl, struct net_device *dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | |
| 57 | static struct neigh_table *neigh_tables; |
Amos Waterland | 45fc3b1 | 2005-09-24 16:53:16 -0700 | [diff] [blame] | 58 | #ifdef CONFIG_PROC_FS |
Arjan van de Ven | 9a32144 | 2007-02-12 00:55:35 -0800 | [diff] [blame] | 59 | static const struct file_operations neigh_stat_seq_fops; |
Amos Waterland | 45fc3b1 | 2005-09-24 16:53:16 -0700 | [diff] [blame] | 60 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | |
| 62 | /* |
| 63 | Neighbour hash table buckets are protected with rwlock tbl->lock. |
| 64 | |
| 65 | - All the scans/updates to hash buckets MUST be made under this lock. |
| 66 | - NOTHING clever should be made under this lock: no callbacks |
| 67 | to protocol backends, no attempts to send something to network. |
| 68 | It will result in deadlocks, if backend/driver wants to use neighbour |
| 69 | cache. |
| 70 | - If the entry requires some non-trivial actions, increase |
| 71 | its reference count and release table lock. |
| 72 | |
| 73 | Neighbour entries are protected: |
| 74 | - with reference count. |
| 75 | - with rwlock neigh->lock |
| 76 | |
| 77 | Reference count prevents destruction. |
| 78 | |
| 79 | neigh->lock mainly serializes ll address data and its validity state. |
| 80 | However, the same lock is used to protect another entry fields: |
| 81 | - timer |
| 82 | - resolution queue |
| 83 | |
| 84 | Again, nothing clever shall be made under neigh->lock, |
| 85 | the most complicated procedure, which we allow is dev->hard_header. |
| 86 | It is supposed, that dev->hard_header is simplistic and does |
| 87 | not make callbacks to neighbour tables. |
| 88 | |
| 89 | The last lock is neigh_tbl_lock. It is pure SMP lock, protecting |
| 90 | list of neighbour tables. This list is used only in process context, |
| 91 | */ |
| 92 | |
| 93 | static DEFINE_RWLOCK(neigh_tbl_lock); |
| 94 | |
David S. Miller | 8f40b16 | 2011-07-17 13:34:11 -0700 | [diff] [blame] | 95 | static int neigh_blackhole(struct neighbour *neigh, struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 96 | { |
| 97 | kfree_skb(skb); |
| 98 | return -ENETDOWN; |
| 99 | } |
| 100 | |
Thomas Graf | 4f49455 | 2007-08-08 23:12:36 -0700 | [diff] [blame] | 101 | static void neigh_cleanup_and_release(struct neighbour *neigh) |
| 102 | { |
| 103 | if (neigh->parms->neigh_cleanup) |
| 104 | neigh->parms->neigh_cleanup(neigh); |
| 105 | |
Thomas Graf | d961db3 | 2007-08-08 23:12:56 -0700 | [diff] [blame] | 106 | __neigh_notify(neigh, RTM_DELNEIGH, 0); |
Thomas Graf | 4f49455 | 2007-08-08 23:12:36 -0700 | [diff] [blame] | 107 | neigh_release(neigh); |
| 108 | } |
| 109 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | /* |
| 111 | * It is random distribution in the interval (1/2)*base...(3/2)*base. |
| 112 | * It corresponds to default IPv6 settings and is not overridable, |
| 113 | * because it is really reasonable choice. |
| 114 | */ |
| 115 | |
| 116 | unsigned long neigh_rand_reach_time(unsigned long base) |
| 117 | { |
Eric Dumazet | a02cec2 | 2010-09-22 20:43:57 +0000 | [diff] [blame] | 118 | return base ? (net_random() % base) + (base >> 1) : 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 119 | } |
YOSHIFUJI Hideaki | 0a20450 | 2008-03-24 18:39:10 +0900 | [diff] [blame] | 120 | EXPORT_SYMBOL(neigh_rand_reach_time); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 121 | |
| 122 | |
| 123 | static int neigh_forced_gc(struct neigh_table *tbl) |
| 124 | { |
| 125 | int shrunk = 0; |
| 126 | int i; |
Eric Dumazet | d6bf781 | 2010-10-04 06:15:44 +0000 | [diff] [blame] | 127 | struct neigh_hash_table *nht; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 128 | |
| 129 | NEIGH_CACHE_STAT_INC(tbl, forced_gc_runs); |
| 130 | |
| 131 | write_lock_bh(&tbl->lock); |
Eric Dumazet | d6bf781 | 2010-10-04 06:15:44 +0000 | [diff] [blame] | 132 | nht = rcu_dereference_protected(tbl->nht, |
| 133 | lockdep_is_held(&tbl->lock)); |
David S. Miller | cd08933 | 2011-07-11 01:28:12 -0700 | [diff] [blame] | 134 | for (i = 0; i < (1 << nht->hash_shift); i++) { |
Eric Dumazet | 767e97e | 2010-10-06 17:49:21 -0700 | [diff] [blame] | 135 | struct neighbour *n; |
| 136 | struct neighbour __rcu **np; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 137 | |
Eric Dumazet | d6bf781 | 2010-10-04 06:15:44 +0000 | [diff] [blame] | 138 | np = &nht->hash_buckets[i]; |
Eric Dumazet | 767e97e | 2010-10-06 17:49:21 -0700 | [diff] [blame] | 139 | while ((n = rcu_dereference_protected(*np, |
| 140 | lockdep_is_held(&tbl->lock))) != NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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)) { |
Eric Dumazet | 767e97e | 2010-10-06 17:49:21 -0700 | [diff] [blame] | 148 | rcu_assign_pointer(*np, |
| 149 | rcu_dereference_protected(n->next, |
| 150 | lockdep_is_held(&tbl->lock))); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 151 | n->dead = 1; |
| 152 | shrunk = 1; |
| 153 | write_unlock(&n->lock); |
Thomas Graf | 4f49455 | 2007-08-08 23:12:36 -0700 | [diff] [blame] | 154 | neigh_cleanup_and_release(n); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 155 | continue; |
| 156 | } |
| 157 | write_unlock(&n->lock); |
| 158 | np = &n->next; |
| 159 | } |
| 160 | } |
| 161 | |
| 162 | tbl->last_flush = jiffies; |
| 163 | |
| 164 | write_unlock_bh(&tbl->lock); |
| 165 | |
| 166 | return shrunk; |
| 167 | } |
| 168 | |
Pavel Emelyanov | a43d899 | 2007-12-20 15:49:05 -0800 | [diff] [blame] | 169 | static void neigh_add_timer(struct neighbour *n, unsigned long when) |
| 170 | { |
| 171 | neigh_hold(n); |
| 172 | if (unlikely(mod_timer(&n->timer, when))) { |
| 173 | printk("NEIGH: BUG, double timer add, state is %x\n", |
| 174 | n->nud_state); |
| 175 | dump_stack(); |
| 176 | } |
| 177 | } |
| 178 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 179 | static int neigh_del_timer(struct neighbour *n) |
| 180 | { |
| 181 | if ((n->nud_state & NUD_IN_TIMER) && |
| 182 | del_timer(&n->timer)) { |
| 183 | neigh_release(n); |
| 184 | return 1; |
| 185 | } |
| 186 | return 0; |
| 187 | } |
| 188 | |
| 189 | static void pneigh_queue_purge(struct sk_buff_head *list) |
| 190 | { |
| 191 | struct sk_buff *skb; |
| 192 | |
| 193 | while ((skb = skb_dequeue(list)) != NULL) { |
| 194 | dev_put(skb->dev); |
| 195 | kfree_skb(skb); |
| 196 | } |
| 197 | } |
| 198 | |
Herbert Xu | 49636bb | 2005-10-23 17:18:00 +1000 | [diff] [blame] | 199 | 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] | 200 | { |
| 201 | int i; |
Eric Dumazet | d6bf781 | 2010-10-04 06:15:44 +0000 | [diff] [blame] | 202 | struct neigh_hash_table *nht; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 203 | |
Eric Dumazet | d6bf781 | 2010-10-04 06:15:44 +0000 | [diff] [blame] | 204 | nht = rcu_dereference_protected(tbl->nht, |
| 205 | lockdep_is_held(&tbl->lock)); |
| 206 | |
David S. Miller | cd08933 | 2011-07-11 01:28:12 -0700 | [diff] [blame] | 207 | for (i = 0; i < (1 << nht->hash_shift); i++) { |
Eric Dumazet | 767e97e | 2010-10-06 17:49:21 -0700 | [diff] [blame] | 208 | struct neighbour *n; |
| 209 | struct neighbour __rcu **np = &nht->hash_buckets[i]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 210 | |
Eric Dumazet | 767e97e | 2010-10-06 17:49:21 -0700 | [diff] [blame] | 211 | while ((n = rcu_dereference_protected(*np, |
| 212 | lockdep_is_held(&tbl->lock))) != NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 213 | if (dev && n->dev != dev) { |
| 214 | np = &n->next; |
| 215 | continue; |
| 216 | } |
Eric Dumazet | 767e97e | 2010-10-06 17:49:21 -0700 | [diff] [blame] | 217 | rcu_assign_pointer(*np, |
| 218 | rcu_dereference_protected(n->next, |
| 219 | lockdep_is_held(&tbl->lock))); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 220 | write_lock(&n->lock); |
| 221 | neigh_del_timer(n); |
| 222 | n->dead = 1; |
| 223 | |
| 224 | if (atomic_read(&n->refcnt) != 1) { |
| 225 | /* The most unpleasant situation. |
| 226 | We must destroy neighbour entry, |
| 227 | but someone still uses it. |
| 228 | |
| 229 | The destroy will be delayed until |
| 230 | the last user releases us, but |
| 231 | we must kill timers etc. and move |
| 232 | it to safe state. |
| 233 | */ |
Eric Dumazet | c9ab4d8 | 2013-06-28 02:37:42 -0700 | [diff] [blame] | 234 | __skb_queue_purge(&n->arp_queue); |
Eric Dumazet | 8b5c171 | 2011-11-09 12:07:14 +0000 | [diff] [blame] | 235 | n->arp_queue_len_bytes = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 236 | n->output = neigh_blackhole; |
| 237 | if (n->nud_state & NUD_VALID) |
| 238 | n->nud_state = NUD_NOARP; |
| 239 | else |
| 240 | n->nud_state = NUD_NONE; |
Joe Perches | d5d427c | 2013-04-15 15:17:19 +0000 | [diff] [blame] | 241 | neigh_dbg(2, "neigh %p is stray\n", n); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 242 | } |
| 243 | write_unlock(&n->lock); |
Thomas Graf | 4f49455 | 2007-08-08 23:12:36 -0700 | [diff] [blame] | 244 | neigh_cleanup_and_release(n); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 245 | } |
| 246 | } |
Herbert Xu | 49636bb | 2005-10-23 17:18:00 +1000 | [diff] [blame] | 247 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 248 | |
Herbert Xu | 49636bb | 2005-10-23 17:18:00 +1000 | [diff] [blame] | 249 | void neigh_changeaddr(struct neigh_table *tbl, struct net_device *dev) |
| 250 | { |
| 251 | write_lock_bh(&tbl->lock); |
| 252 | neigh_flush_dev(tbl, dev); |
| 253 | write_unlock_bh(&tbl->lock); |
| 254 | } |
YOSHIFUJI Hideaki | 0a20450 | 2008-03-24 18:39:10 +0900 | [diff] [blame] | 255 | EXPORT_SYMBOL(neigh_changeaddr); |
Herbert Xu | 49636bb | 2005-10-23 17:18:00 +1000 | [diff] [blame] | 256 | |
| 257 | int neigh_ifdown(struct neigh_table *tbl, struct net_device *dev) |
| 258 | { |
| 259 | write_lock_bh(&tbl->lock); |
| 260 | neigh_flush_dev(tbl, dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 261 | pneigh_ifdown(tbl, dev); |
| 262 | write_unlock_bh(&tbl->lock); |
| 263 | |
| 264 | del_timer_sync(&tbl->proxy_timer); |
| 265 | pneigh_queue_purge(&tbl->proxy_queue); |
| 266 | return 0; |
| 267 | } |
YOSHIFUJI Hideaki | 0a20450 | 2008-03-24 18:39:10 +0900 | [diff] [blame] | 268 | EXPORT_SYMBOL(neigh_ifdown); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 269 | |
David Miller | 596b9b6 | 2011-07-25 00:01:25 +0000 | [diff] [blame] | 270 | static struct neighbour *neigh_alloc(struct neigh_table *tbl, struct net_device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 271 | { |
| 272 | struct neighbour *n = NULL; |
| 273 | unsigned long now = jiffies; |
| 274 | int entries; |
| 275 | |
| 276 | entries = atomic_inc_return(&tbl->entries) - 1; |
| 277 | if (entries >= tbl->gc_thresh3 || |
| 278 | (entries >= tbl->gc_thresh2 && |
| 279 | time_after(now, tbl->last_flush + 5 * HZ))) { |
| 280 | if (!neigh_forced_gc(tbl) && |
| 281 | entries >= tbl->gc_thresh3) |
| 282 | goto out_entries; |
| 283 | } |
| 284 | |
YOSHIFUJI Hideaki / 吉藤英明 | 08433ef | 2013-01-24 00:44:23 +0000 | [diff] [blame] | 285 | n = kzalloc(tbl->entry_size + dev->neigh_priv_len, GFP_ATOMIC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 286 | if (!n) |
| 287 | goto out_entries; |
| 288 | |
Eric Dumazet | c9ab4d8 | 2013-06-28 02:37:42 -0700 | [diff] [blame] | 289 | __skb_queue_head_init(&n->arp_queue); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 290 | rwlock_init(&n->lock); |
Eric Dumazet | 0ed8ddf | 2010-10-07 10:44:07 +0000 | [diff] [blame] | 291 | seqlock_init(&n->ha_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 292 | n->updated = n->used = now; |
| 293 | n->nud_state = NUD_NONE; |
| 294 | n->output = neigh_blackhole; |
David S. Miller | f6b72b6 | 2011-07-14 07:53:20 -0700 | [diff] [blame] | 295 | seqlock_init(&n->hh.hh_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 296 | n->parms = neigh_parms_clone(&tbl->parms); |
Pavel Emelyanov | b24b8a2 | 2008-01-23 21:20:07 -0800 | [diff] [blame] | 297 | setup_timer(&n->timer, neigh_timer_handler, (unsigned long)n); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 298 | |
| 299 | NEIGH_CACHE_STAT_INC(tbl, allocs); |
| 300 | n->tbl = tbl; |
| 301 | atomic_set(&n->refcnt, 1); |
| 302 | n->dead = 1; |
| 303 | out: |
| 304 | return n; |
| 305 | |
| 306 | out_entries: |
| 307 | atomic_dec(&tbl->entries); |
| 308 | goto out; |
| 309 | } |
| 310 | |
David S. Miller | 2c2aba6 | 2011-12-28 15:06:58 -0500 | [diff] [blame] | 311 | static void neigh_get_hash_rnd(u32 *x) |
| 312 | { |
| 313 | get_random_bytes(x, sizeof(*x)); |
| 314 | *x |= 1; |
| 315 | } |
| 316 | |
David S. Miller | cd08933 | 2011-07-11 01:28:12 -0700 | [diff] [blame] | 317 | static struct neigh_hash_table *neigh_hash_alloc(unsigned int shift) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 318 | { |
David S. Miller | cd08933 | 2011-07-11 01:28:12 -0700 | [diff] [blame] | 319 | size_t size = (1 << shift) * sizeof(struct neighbour *); |
Eric Dumazet | d6bf781 | 2010-10-04 06:15:44 +0000 | [diff] [blame] | 320 | struct neigh_hash_table *ret; |
Eric Dumazet | 6193d2b | 2011-01-19 22:02:47 +0000 | [diff] [blame] | 321 | struct neighbour __rcu **buckets; |
David S. Miller | 2c2aba6 | 2011-12-28 15:06:58 -0500 | [diff] [blame] | 322 | int i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 323 | |
Eric Dumazet | d6bf781 | 2010-10-04 06:15:44 +0000 | [diff] [blame] | 324 | ret = kmalloc(sizeof(*ret), GFP_ATOMIC); |
| 325 | if (!ret) |
| 326 | return NULL; |
| 327 | if (size <= PAGE_SIZE) |
| 328 | buckets = kzalloc(size, GFP_ATOMIC); |
| 329 | else |
Eric Dumazet | 6193d2b | 2011-01-19 22:02:47 +0000 | [diff] [blame] | 330 | buckets = (struct neighbour __rcu **) |
Eric Dumazet | d6bf781 | 2010-10-04 06:15:44 +0000 | [diff] [blame] | 331 | __get_free_pages(GFP_ATOMIC | __GFP_ZERO, |
| 332 | get_order(size)); |
| 333 | if (!buckets) { |
| 334 | kfree(ret); |
| 335 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 336 | } |
Eric Dumazet | 6193d2b | 2011-01-19 22:02:47 +0000 | [diff] [blame] | 337 | ret->hash_buckets = buckets; |
David S. Miller | cd08933 | 2011-07-11 01:28:12 -0700 | [diff] [blame] | 338 | ret->hash_shift = shift; |
David S. Miller | 2c2aba6 | 2011-12-28 15:06:58 -0500 | [diff] [blame] | 339 | for (i = 0; i < NEIGH_NUM_HASH_RND; i++) |
| 340 | neigh_get_hash_rnd(&ret->hash_rnd[i]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 341 | return ret; |
| 342 | } |
| 343 | |
Eric Dumazet | d6bf781 | 2010-10-04 06:15:44 +0000 | [diff] [blame] | 344 | static void neigh_hash_free_rcu(struct rcu_head *head) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 345 | { |
Eric Dumazet | d6bf781 | 2010-10-04 06:15:44 +0000 | [diff] [blame] | 346 | struct neigh_hash_table *nht = container_of(head, |
| 347 | struct neigh_hash_table, |
| 348 | rcu); |
David S. Miller | cd08933 | 2011-07-11 01:28:12 -0700 | [diff] [blame] | 349 | size_t size = (1 << nht->hash_shift) * sizeof(struct neighbour *); |
Eric Dumazet | 6193d2b | 2011-01-19 22:02:47 +0000 | [diff] [blame] | 350 | struct neighbour __rcu **buckets = nht->hash_buckets; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 351 | |
| 352 | if (size <= PAGE_SIZE) |
Eric Dumazet | d6bf781 | 2010-10-04 06:15:44 +0000 | [diff] [blame] | 353 | kfree(buckets); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 354 | else |
Eric Dumazet | d6bf781 | 2010-10-04 06:15:44 +0000 | [diff] [blame] | 355 | free_pages((unsigned long)buckets, get_order(size)); |
| 356 | kfree(nht); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 357 | } |
| 358 | |
Eric Dumazet | d6bf781 | 2010-10-04 06:15:44 +0000 | [diff] [blame] | 359 | static struct neigh_hash_table *neigh_hash_grow(struct neigh_table *tbl, |
David S. Miller | cd08933 | 2011-07-11 01:28:12 -0700 | [diff] [blame] | 360 | unsigned long new_shift) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 361 | { |
Eric Dumazet | d6bf781 | 2010-10-04 06:15:44 +0000 | [diff] [blame] | 362 | unsigned int i, hash; |
| 363 | struct neigh_hash_table *new_nht, *old_nht; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 364 | |
| 365 | NEIGH_CACHE_STAT_INC(tbl, hash_grows); |
| 366 | |
Eric Dumazet | d6bf781 | 2010-10-04 06:15:44 +0000 | [diff] [blame] | 367 | old_nht = rcu_dereference_protected(tbl->nht, |
| 368 | lockdep_is_held(&tbl->lock)); |
David S. Miller | cd08933 | 2011-07-11 01:28:12 -0700 | [diff] [blame] | 369 | new_nht = neigh_hash_alloc(new_shift); |
Eric Dumazet | d6bf781 | 2010-10-04 06:15:44 +0000 | [diff] [blame] | 370 | if (!new_nht) |
| 371 | return old_nht; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 372 | |
David S. Miller | cd08933 | 2011-07-11 01:28:12 -0700 | [diff] [blame] | 373 | for (i = 0; i < (1 << old_nht->hash_shift); i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 374 | struct neighbour *n, *next; |
| 375 | |
Eric Dumazet | 767e97e | 2010-10-06 17:49:21 -0700 | [diff] [blame] | 376 | for (n = rcu_dereference_protected(old_nht->hash_buckets[i], |
| 377 | lockdep_is_held(&tbl->lock)); |
Eric Dumazet | d6bf781 | 2010-10-04 06:15:44 +0000 | [diff] [blame] | 378 | n != NULL; |
| 379 | n = next) { |
| 380 | hash = tbl->hash(n->primary_key, n->dev, |
| 381 | new_nht->hash_rnd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 382 | |
David S. Miller | cd08933 | 2011-07-11 01:28:12 -0700 | [diff] [blame] | 383 | hash >>= (32 - new_nht->hash_shift); |
Eric Dumazet | 767e97e | 2010-10-06 17:49:21 -0700 | [diff] [blame] | 384 | next = rcu_dereference_protected(n->next, |
| 385 | lockdep_is_held(&tbl->lock)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 386 | |
Eric Dumazet | 767e97e | 2010-10-06 17:49:21 -0700 | [diff] [blame] | 387 | rcu_assign_pointer(n->next, |
| 388 | rcu_dereference_protected( |
| 389 | new_nht->hash_buckets[hash], |
| 390 | lockdep_is_held(&tbl->lock))); |
| 391 | rcu_assign_pointer(new_nht->hash_buckets[hash], n); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 392 | } |
| 393 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 394 | |
Eric Dumazet | d6bf781 | 2010-10-04 06:15:44 +0000 | [diff] [blame] | 395 | rcu_assign_pointer(tbl->nht, new_nht); |
| 396 | call_rcu(&old_nht->rcu, neigh_hash_free_rcu); |
| 397 | return new_nht; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 398 | } |
| 399 | |
| 400 | struct neighbour *neigh_lookup(struct neigh_table *tbl, const void *pkey, |
| 401 | struct net_device *dev) |
| 402 | { |
| 403 | struct neighbour *n; |
| 404 | int key_len = tbl->key_len; |
Pavel Emelyanov | bc4bf5f | 2008-02-23 19:57:02 -0800 | [diff] [blame] | 405 | u32 hash_val; |
Eric Dumazet | d6bf781 | 2010-10-04 06:15:44 +0000 | [diff] [blame] | 406 | struct neigh_hash_table *nht; |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 407 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 408 | NEIGH_CACHE_STAT_INC(tbl, lookups); |
| 409 | |
Eric Dumazet | d6bf781 | 2010-10-04 06:15:44 +0000 | [diff] [blame] | 410 | rcu_read_lock_bh(); |
| 411 | nht = rcu_dereference_bh(tbl->nht); |
David S. Miller | cd08933 | 2011-07-11 01:28:12 -0700 | [diff] [blame] | 412 | hash_val = tbl->hash(pkey, dev, nht->hash_rnd) >> (32 - nht->hash_shift); |
Eric Dumazet | 767e97e | 2010-10-06 17:49:21 -0700 | [diff] [blame] | 413 | |
| 414 | for (n = rcu_dereference_bh(nht->hash_buckets[hash_val]); |
| 415 | n != NULL; |
| 416 | n = rcu_dereference_bh(n->next)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 417 | if (dev == n->dev && !memcmp(n->primary_key, pkey, key_len)) { |
Eric Dumazet | 767e97e | 2010-10-06 17:49:21 -0700 | [diff] [blame] | 418 | if (!atomic_inc_not_zero(&n->refcnt)) |
| 419 | n = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 420 | NEIGH_CACHE_STAT_INC(tbl, hits); |
| 421 | break; |
| 422 | } |
| 423 | } |
Eric Dumazet | 767e97e | 2010-10-06 17:49:21 -0700 | [diff] [blame] | 424 | |
Eric Dumazet | d6bf781 | 2010-10-04 06:15:44 +0000 | [diff] [blame] | 425 | rcu_read_unlock_bh(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 426 | return n; |
| 427 | } |
YOSHIFUJI Hideaki | 0a20450 | 2008-03-24 18:39:10 +0900 | [diff] [blame] | 428 | EXPORT_SYMBOL(neigh_lookup); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 429 | |
Eric W. Biederman | 426b530 | 2008-01-24 00:13:18 -0800 | [diff] [blame] | 430 | struct neighbour *neigh_lookup_nodev(struct neigh_table *tbl, struct net *net, |
| 431 | const void *pkey) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 432 | { |
| 433 | struct neighbour *n; |
| 434 | int key_len = tbl->key_len; |
Pavel Emelyanov | bc4bf5f | 2008-02-23 19:57:02 -0800 | [diff] [blame] | 435 | u32 hash_val; |
Eric Dumazet | d6bf781 | 2010-10-04 06:15:44 +0000 | [diff] [blame] | 436 | struct neigh_hash_table *nht; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 437 | |
| 438 | NEIGH_CACHE_STAT_INC(tbl, lookups); |
| 439 | |
Eric Dumazet | d6bf781 | 2010-10-04 06:15:44 +0000 | [diff] [blame] | 440 | rcu_read_lock_bh(); |
| 441 | nht = rcu_dereference_bh(tbl->nht); |
David S. Miller | cd08933 | 2011-07-11 01:28:12 -0700 | [diff] [blame] | 442 | hash_val = tbl->hash(pkey, NULL, nht->hash_rnd) >> (32 - nht->hash_shift); |
Eric Dumazet | 767e97e | 2010-10-06 17:49:21 -0700 | [diff] [blame] | 443 | |
| 444 | for (n = rcu_dereference_bh(nht->hash_buckets[hash_val]); |
| 445 | n != NULL; |
| 446 | n = rcu_dereference_bh(n->next)) { |
Eric W. Biederman | 426b530 | 2008-01-24 00:13:18 -0800 | [diff] [blame] | 447 | if (!memcmp(n->primary_key, pkey, key_len) && |
YOSHIFUJI Hideaki | 878628f | 2008-03-26 03:57:35 +0900 | [diff] [blame] | 448 | net_eq(dev_net(n->dev), net)) { |
Eric Dumazet | 767e97e | 2010-10-06 17:49:21 -0700 | [diff] [blame] | 449 | if (!atomic_inc_not_zero(&n->refcnt)) |
| 450 | n = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 451 | NEIGH_CACHE_STAT_INC(tbl, hits); |
| 452 | break; |
| 453 | } |
| 454 | } |
Eric Dumazet | 767e97e | 2010-10-06 17:49:21 -0700 | [diff] [blame] | 455 | |
Eric Dumazet | d6bf781 | 2010-10-04 06:15:44 +0000 | [diff] [blame] | 456 | rcu_read_unlock_bh(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 457 | return n; |
| 458 | } |
YOSHIFUJI Hideaki | 0a20450 | 2008-03-24 18:39:10 +0900 | [diff] [blame] | 459 | EXPORT_SYMBOL(neigh_lookup_nodev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 460 | |
David S. Miller | a263b30 | 2012-07-02 02:02:15 -0700 | [diff] [blame] | 461 | struct neighbour *__neigh_create(struct neigh_table *tbl, const void *pkey, |
| 462 | struct net_device *dev, bool want_ref) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 463 | { |
| 464 | u32 hash_val; |
| 465 | int key_len = tbl->key_len; |
| 466 | int error; |
David Miller | 596b9b6 | 2011-07-25 00:01:25 +0000 | [diff] [blame] | 467 | struct neighbour *n1, *rc, *n = neigh_alloc(tbl, dev); |
Eric Dumazet | d6bf781 | 2010-10-04 06:15:44 +0000 | [diff] [blame] | 468 | struct neigh_hash_table *nht; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 469 | |
| 470 | if (!n) { |
| 471 | rc = ERR_PTR(-ENOBUFS); |
| 472 | goto out; |
| 473 | } |
| 474 | |
| 475 | memcpy(n->primary_key, pkey, key_len); |
| 476 | n->dev = dev; |
| 477 | dev_hold(dev); |
| 478 | |
| 479 | /* Protocol specific setup. */ |
| 480 | if (tbl->constructor && (error = tbl->constructor(n)) < 0) { |
| 481 | rc = ERR_PTR(error); |
| 482 | goto out_neigh_release; |
| 483 | } |
| 484 | |
David Miller | da6a8fa | 2011-07-25 00:01:38 +0000 | [diff] [blame] | 485 | if (dev->netdev_ops->ndo_neigh_construct) { |
| 486 | error = dev->netdev_ops->ndo_neigh_construct(n); |
| 487 | if (error < 0) { |
| 488 | rc = ERR_PTR(error); |
| 489 | goto out_neigh_release; |
| 490 | } |
| 491 | } |
| 492 | |
David S. Miller | 447f219 | 2011-12-19 15:04:41 -0500 | [diff] [blame] | 493 | /* Device specific setup. */ |
| 494 | if (n->parms->neigh_setup && |
| 495 | (error = n->parms->neigh_setup(n)) < 0) { |
| 496 | rc = ERR_PTR(error); |
| 497 | goto out_neigh_release; |
| 498 | } |
| 499 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 500 | n->confirmed = jiffies - (n->parms->base_reachable_time << 1); |
| 501 | |
| 502 | write_lock_bh(&tbl->lock); |
Eric Dumazet | d6bf781 | 2010-10-04 06:15:44 +0000 | [diff] [blame] | 503 | nht = rcu_dereference_protected(tbl->nht, |
| 504 | lockdep_is_held(&tbl->lock)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 505 | |
David S. Miller | cd08933 | 2011-07-11 01:28:12 -0700 | [diff] [blame] | 506 | if (atomic_read(&tbl->entries) > (1 << nht->hash_shift)) |
| 507 | nht = neigh_hash_grow(tbl, nht->hash_shift + 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 508 | |
David S. Miller | cd08933 | 2011-07-11 01:28:12 -0700 | [diff] [blame] | 509 | hash_val = tbl->hash(pkey, dev, nht->hash_rnd) >> (32 - nht->hash_shift); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 510 | |
| 511 | if (n->parms->dead) { |
| 512 | rc = ERR_PTR(-EINVAL); |
| 513 | goto out_tbl_unlock; |
| 514 | } |
| 515 | |
Eric Dumazet | 767e97e | 2010-10-06 17:49:21 -0700 | [diff] [blame] | 516 | for (n1 = rcu_dereference_protected(nht->hash_buckets[hash_val], |
| 517 | lockdep_is_held(&tbl->lock)); |
| 518 | n1 != NULL; |
| 519 | n1 = rcu_dereference_protected(n1->next, |
| 520 | lockdep_is_held(&tbl->lock))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 521 | if (dev == n1->dev && !memcmp(n1->primary_key, pkey, key_len)) { |
David S. Miller | a263b30 | 2012-07-02 02:02:15 -0700 | [diff] [blame] | 522 | if (want_ref) |
| 523 | neigh_hold(n1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 524 | rc = n1; |
| 525 | goto out_tbl_unlock; |
| 526 | } |
| 527 | } |
| 528 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 529 | n->dead = 0; |
David S. Miller | a263b30 | 2012-07-02 02:02:15 -0700 | [diff] [blame] | 530 | if (want_ref) |
| 531 | neigh_hold(n); |
Eric Dumazet | 767e97e | 2010-10-06 17:49:21 -0700 | [diff] [blame] | 532 | rcu_assign_pointer(n->next, |
| 533 | rcu_dereference_protected(nht->hash_buckets[hash_val], |
| 534 | lockdep_is_held(&tbl->lock))); |
| 535 | rcu_assign_pointer(nht->hash_buckets[hash_val], n); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 536 | write_unlock_bh(&tbl->lock); |
Joe Perches | d5d427c | 2013-04-15 15:17:19 +0000 | [diff] [blame] | 537 | neigh_dbg(2, "neigh %p is created\n", n); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 538 | rc = n; |
| 539 | out: |
| 540 | return rc; |
| 541 | out_tbl_unlock: |
| 542 | write_unlock_bh(&tbl->lock); |
| 543 | out_neigh_release: |
| 544 | neigh_release(n); |
| 545 | goto out; |
| 546 | } |
David S. Miller | a263b30 | 2012-07-02 02:02:15 -0700 | [diff] [blame] | 547 | EXPORT_SYMBOL(__neigh_create); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 548 | |
YOSHIFUJI Hideaki | be01d65 | 2008-03-28 12:46:53 +0900 | [diff] [blame] | 549 | static u32 pneigh_hash(const void *pkey, int key_len) |
Pavel Emelyanov | fa86d32 | 2008-03-24 14:48:59 -0700 | [diff] [blame] | 550 | { |
Pavel Emelyanov | fa86d32 | 2008-03-24 14:48:59 -0700 | [diff] [blame] | 551 | u32 hash_val = *(u32 *)(pkey + key_len - 4); |
Pavel Emelyanov | fa86d32 | 2008-03-24 14:48:59 -0700 | [diff] [blame] | 552 | hash_val ^= (hash_val >> 16); |
| 553 | hash_val ^= hash_val >> 8; |
| 554 | hash_val ^= hash_val >> 4; |
| 555 | hash_val &= PNEIGH_HASHMASK; |
YOSHIFUJI Hideaki | be01d65 | 2008-03-28 12:46:53 +0900 | [diff] [blame] | 556 | return hash_val; |
| 557 | } |
Pavel Emelyanov | fa86d32 | 2008-03-24 14:48:59 -0700 | [diff] [blame] | 558 | |
YOSHIFUJI Hideaki | be01d65 | 2008-03-28 12:46:53 +0900 | [diff] [blame] | 559 | static struct pneigh_entry *__pneigh_lookup_1(struct pneigh_entry *n, |
| 560 | struct net *net, |
| 561 | const void *pkey, |
| 562 | int key_len, |
| 563 | struct net_device *dev) |
| 564 | { |
| 565 | while (n) { |
Pavel Emelyanov | fa86d32 | 2008-03-24 14:48:59 -0700 | [diff] [blame] | 566 | if (!memcmp(n->key, pkey, key_len) && |
YOSHIFUJI Hideaki | be01d65 | 2008-03-28 12:46:53 +0900 | [diff] [blame] | 567 | net_eq(pneigh_net(n), net) && |
Pavel Emelyanov | fa86d32 | 2008-03-24 14:48:59 -0700 | [diff] [blame] | 568 | (n->dev == dev || !n->dev)) |
YOSHIFUJI Hideaki | be01d65 | 2008-03-28 12:46:53 +0900 | [diff] [blame] | 569 | return n; |
| 570 | n = n->next; |
Pavel Emelyanov | fa86d32 | 2008-03-24 14:48:59 -0700 | [diff] [blame] | 571 | } |
YOSHIFUJI Hideaki | be01d65 | 2008-03-28 12:46:53 +0900 | [diff] [blame] | 572 | return NULL; |
| 573 | } |
Pavel Emelyanov | fa86d32 | 2008-03-24 14:48:59 -0700 | [diff] [blame] | 574 | |
YOSHIFUJI Hideaki | be01d65 | 2008-03-28 12:46:53 +0900 | [diff] [blame] | 575 | struct pneigh_entry *__pneigh_lookup(struct neigh_table *tbl, |
| 576 | struct net *net, const void *pkey, struct net_device *dev) |
| 577 | { |
| 578 | int key_len = tbl->key_len; |
| 579 | u32 hash_val = pneigh_hash(pkey, key_len); |
| 580 | |
| 581 | return __pneigh_lookup_1(tbl->phash_buckets[hash_val], |
| 582 | net, pkey, key_len, dev); |
Pavel Emelyanov | fa86d32 | 2008-03-24 14:48:59 -0700 | [diff] [blame] | 583 | } |
YOSHIFUJI Hideaki | 0a20450 | 2008-03-24 18:39:10 +0900 | [diff] [blame] | 584 | EXPORT_SYMBOL_GPL(__pneigh_lookup); |
Pavel Emelyanov | fa86d32 | 2008-03-24 14:48:59 -0700 | [diff] [blame] | 585 | |
Eric W. Biederman | 426b530 | 2008-01-24 00:13:18 -0800 | [diff] [blame] | 586 | struct pneigh_entry * pneigh_lookup(struct neigh_table *tbl, |
| 587 | struct net *net, const void *pkey, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 588 | struct net_device *dev, int creat) |
| 589 | { |
| 590 | struct pneigh_entry *n; |
| 591 | int key_len = tbl->key_len; |
YOSHIFUJI Hideaki | be01d65 | 2008-03-28 12:46:53 +0900 | [diff] [blame] | 592 | u32 hash_val = pneigh_hash(pkey, key_len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 593 | |
| 594 | read_lock_bh(&tbl->lock); |
YOSHIFUJI Hideaki | be01d65 | 2008-03-28 12:46:53 +0900 | [diff] [blame] | 595 | n = __pneigh_lookup_1(tbl->phash_buckets[hash_val], |
| 596 | net, pkey, key_len, dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 597 | read_unlock_bh(&tbl->lock); |
YOSHIFUJI Hideaki | be01d65 | 2008-03-28 12:46:53 +0900 | [diff] [blame] | 598 | |
| 599 | if (n || !creat) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 600 | goto out; |
| 601 | |
Pavel Emelyanov | 4ae2894 | 2007-10-15 12:54:15 -0700 | [diff] [blame] | 602 | ASSERT_RTNL(); |
| 603 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 604 | n = kmalloc(sizeof(*n) + key_len, GFP_KERNEL); |
| 605 | if (!n) |
| 606 | goto out; |
| 607 | |
Eric Dumazet | e42ea98 | 2008-11-12 00:54:54 -0800 | [diff] [blame] | 608 | write_pnet(&n->net, hold_net(net)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 609 | memcpy(n->key, pkey, key_len); |
| 610 | n->dev = dev; |
| 611 | if (dev) |
| 612 | dev_hold(dev); |
| 613 | |
| 614 | if (tbl->pconstructor && tbl->pconstructor(n)) { |
| 615 | if (dev) |
| 616 | dev_put(dev); |
Denis V. Lunev | da12f73 | 2008-02-20 00:26:16 -0800 | [diff] [blame] | 617 | release_net(net); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 618 | kfree(n); |
| 619 | n = NULL; |
| 620 | goto out; |
| 621 | } |
| 622 | |
| 623 | write_lock_bh(&tbl->lock); |
| 624 | n->next = tbl->phash_buckets[hash_val]; |
| 625 | tbl->phash_buckets[hash_val] = n; |
| 626 | write_unlock_bh(&tbl->lock); |
| 627 | out: |
| 628 | return n; |
| 629 | } |
YOSHIFUJI Hideaki | 0a20450 | 2008-03-24 18:39:10 +0900 | [diff] [blame] | 630 | EXPORT_SYMBOL(pneigh_lookup); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 631 | |
| 632 | |
Eric W. Biederman | 426b530 | 2008-01-24 00:13:18 -0800 | [diff] [blame] | 633 | 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] | 634 | struct net_device *dev) |
| 635 | { |
| 636 | struct pneigh_entry *n, **np; |
| 637 | int key_len = tbl->key_len; |
YOSHIFUJI Hideaki | be01d65 | 2008-03-28 12:46:53 +0900 | [diff] [blame] | 638 | u32 hash_val = pneigh_hash(pkey, key_len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 639 | |
| 640 | write_lock_bh(&tbl->lock); |
| 641 | for (np = &tbl->phash_buckets[hash_val]; (n = *np) != NULL; |
| 642 | np = &n->next) { |
Eric W. Biederman | 426b530 | 2008-01-24 00:13:18 -0800 | [diff] [blame] | 643 | if (!memcmp(n->key, pkey, key_len) && n->dev == dev && |
YOSHIFUJI Hideaki | 878628f | 2008-03-26 03:57:35 +0900 | [diff] [blame] | 644 | net_eq(pneigh_net(n), net)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 645 | *np = n->next; |
| 646 | write_unlock_bh(&tbl->lock); |
| 647 | if (tbl->pdestructor) |
| 648 | tbl->pdestructor(n); |
| 649 | if (n->dev) |
| 650 | dev_put(n->dev); |
YOSHIFUJI Hideaki | 57da52c | 2008-03-26 03:49:59 +0900 | [diff] [blame] | 651 | release_net(pneigh_net(n)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 652 | kfree(n); |
| 653 | return 0; |
| 654 | } |
| 655 | } |
| 656 | write_unlock_bh(&tbl->lock); |
| 657 | return -ENOENT; |
| 658 | } |
| 659 | |
| 660 | static int pneigh_ifdown(struct neigh_table *tbl, struct net_device *dev) |
| 661 | { |
| 662 | struct pneigh_entry *n, **np; |
| 663 | u32 h; |
| 664 | |
| 665 | for (h = 0; h <= PNEIGH_HASHMASK; h++) { |
| 666 | np = &tbl->phash_buckets[h]; |
| 667 | while ((n = *np) != NULL) { |
| 668 | if (!dev || n->dev == dev) { |
| 669 | *np = n->next; |
| 670 | if (tbl->pdestructor) |
| 671 | tbl->pdestructor(n); |
| 672 | if (n->dev) |
| 673 | dev_put(n->dev); |
YOSHIFUJI Hideaki | 57da52c | 2008-03-26 03:49:59 +0900 | [diff] [blame] | 674 | release_net(pneigh_net(n)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 675 | kfree(n); |
| 676 | continue; |
| 677 | } |
| 678 | np = &n->next; |
| 679 | } |
| 680 | } |
| 681 | return -ENOENT; |
| 682 | } |
| 683 | |
Denis V. Lunev | 06f0511 | 2008-01-24 00:30:58 -0800 | [diff] [blame] | 684 | static void neigh_parms_destroy(struct neigh_parms *parms); |
| 685 | |
| 686 | static inline void neigh_parms_put(struct neigh_parms *parms) |
| 687 | { |
| 688 | if (atomic_dec_and_test(&parms->refcnt)) |
| 689 | neigh_parms_destroy(parms); |
| 690 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 691 | |
| 692 | /* |
| 693 | * neighbour must already be out of the table; |
| 694 | * |
| 695 | */ |
| 696 | void neigh_destroy(struct neighbour *neigh) |
| 697 | { |
David Miller | da6a8fa | 2011-07-25 00:01:38 +0000 | [diff] [blame] | 698 | struct net_device *dev = neigh->dev; |
| 699 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 700 | NEIGH_CACHE_STAT_INC(neigh->tbl, destroys); |
| 701 | |
| 702 | if (!neigh->dead) { |
Joe Perches | e005d19 | 2012-05-16 19:58:40 +0000 | [diff] [blame] | 703 | pr_warn("Destroying alive neighbour %p\n", neigh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 704 | dump_stack(); |
| 705 | return; |
| 706 | } |
| 707 | |
| 708 | if (neigh_del_timer(neigh)) |
Joe Perches | e005d19 | 2012-05-16 19:58:40 +0000 | [diff] [blame] | 709 | pr_warn("Impossible event\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 710 | |
Eric Dumazet | c9ab4d8 | 2013-06-28 02:37:42 -0700 | [diff] [blame] | 711 | write_lock_bh(&neigh->lock); |
| 712 | __skb_queue_purge(&neigh->arp_queue); |
| 713 | write_unlock_bh(&neigh->lock); |
Eric Dumazet | 8b5c171 | 2011-11-09 12:07:14 +0000 | [diff] [blame] | 714 | neigh->arp_queue_len_bytes = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 715 | |
David S. Miller | 447f219 | 2011-12-19 15:04:41 -0500 | [diff] [blame] | 716 | if (dev->netdev_ops->ndo_neigh_destroy) |
| 717 | dev->netdev_ops->ndo_neigh_destroy(neigh); |
| 718 | |
David Miller | da6a8fa | 2011-07-25 00:01:38 +0000 | [diff] [blame] | 719 | dev_put(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 720 | neigh_parms_put(neigh->parms); |
| 721 | |
Joe Perches | d5d427c | 2013-04-15 15:17:19 +0000 | [diff] [blame] | 722 | neigh_dbg(2, "neigh %p is destroyed\n", neigh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 723 | |
| 724 | atomic_dec(&neigh->tbl->entries); |
David Miller | 5b8b006 | 2011-07-25 00:01:22 +0000 | [diff] [blame] | 725 | kfree_rcu(neigh, rcu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 726 | } |
YOSHIFUJI Hideaki | 0a20450 | 2008-03-24 18:39:10 +0900 | [diff] [blame] | 727 | EXPORT_SYMBOL(neigh_destroy); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 728 | |
| 729 | /* Neighbour state is suspicious; |
| 730 | disable fast path. |
| 731 | |
| 732 | Called with write_locked neigh. |
| 733 | */ |
| 734 | static void neigh_suspect(struct neighbour *neigh) |
| 735 | { |
Joe Perches | d5d427c | 2013-04-15 15:17:19 +0000 | [diff] [blame] | 736 | neigh_dbg(2, "neigh %p is suspected\n", neigh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 737 | |
| 738 | neigh->output = neigh->ops->output; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 739 | } |
| 740 | |
| 741 | /* Neighbour state is OK; |
| 742 | enable fast path. |
| 743 | |
| 744 | Called with write_locked neigh. |
| 745 | */ |
| 746 | static void neigh_connect(struct neighbour *neigh) |
| 747 | { |
Joe Perches | d5d427c | 2013-04-15 15:17:19 +0000 | [diff] [blame] | 748 | neigh_dbg(2, "neigh %p is connected\n", neigh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 749 | |
| 750 | neigh->output = neigh->ops->connected_output; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 751 | } |
| 752 | |
Eric Dumazet | e4c4e44 | 2009-07-30 03:15:07 +0000 | [diff] [blame] | 753 | static void neigh_periodic_work(struct work_struct *work) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 754 | { |
Eric Dumazet | e4c4e44 | 2009-07-30 03:15:07 +0000 | [diff] [blame] | 755 | struct neigh_table *tbl = container_of(work, struct neigh_table, gc_work.work); |
Eric Dumazet | 767e97e | 2010-10-06 17:49:21 -0700 | [diff] [blame] | 756 | struct neighbour *n; |
| 757 | struct neighbour __rcu **np; |
Eric Dumazet | e4c4e44 | 2009-07-30 03:15:07 +0000 | [diff] [blame] | 758 | unsigned int i; |
Eric Dumazet | d6bf781 | 2010-10-04 06:15:44 +0000 | [diff] [blame] | 759 | struct neigh_hash_table *nht; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 760 | |
| 761 | NEIGH_CACHE_STAT_INC(tbl, periodic_gc_runs); |
| 762 | |
Eric Dumazet | e4c4e44 | 2009-07-30 03:15:07 +0000 | [diff] [blame] | 763 | write_lock_bh(&tbl->lock); |
Eric Dumazet | d6bf781 | 2010-10-04 06:15:44 +0000 | [diff] [blame] | 764 | nht = rcu_dereference_protected(tbl->nht, |
| 765 | lockdep_is_held(&tbl->lock)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 766 | |
YOSHIFUJI Hideaki / 吉藤英明 | 2724680 | 2013-01-22 05:20:05 +0000 | [diff] [blame] | 767 | if (atomic_read(&tbl->entries) < tbl->gc_thresh1) |
| 768 | goto out; |
| 769 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 770 | /* |
| 771 | * periodically recompute ReachableTime from random function |
| 772 | */ |
| 773 | |
Eric Dumazet | e4c4e44 | 2009-07-30 03:15:07 +0000 | [diff] [blame] | 774 | if (time_after(jiffies, tbl->last_rand + 300 * HZ)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 775 | struct neigh_parms *p; |
Eric Dumazet | e4c4e44 | 2009-07-30 03:15:07 +0000 | [diff] [blame] | 776 | tbl->last_rand = jiffies; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 777 | for (p = &tbl->parms; p; p = p->next) |
| 778 | p->reachable_time = |
| 779 | neigh_rand_reach_time(p->base_reachable_time); |
| 780 | } |
| 781 | |
David S. Miller | cd08933 | 2011-07-11 01:28:12 -0700 | [diff] [blame] | 782 | for (i = 0 ; i < (1 << nht->hash_shift); i++) { |
Eric Dumazet | d6bf781 | 2010-10-04 06:15:44 +0000 | [diff] [blame] | 783 | np = &nht->hash_buckets[i]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 784 | |
Eric Dumazet | 767e97e | 2010-10-06 17:49:21 -0700 | [diff] [blame] | 785 | while ((n = rcu_dereference_protected(*np, |
| 786 | lockdep_is_held(&tbl->lock))) != NULL) { |
Eric Dumazet | e4c4e44 | 2009-07-30 03:15:07 +0000 | [diff] [blame] | 787 | unsigned int state; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 788 | |
Eric Dumazet | e4c4e44 | 2009-07-30 03:15:07 +0000 | [diff] [blame] | 789 | write_lock(&n->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 790 | |
Eric Dumazet | e4c4e44 | 2009-07-30 03:15:07 +0000 | [diff] [blame] | 791 | state = n->nud_state; |
| 792 | if (state & (NUD_PERMANENT | NUD_IN_TIMER)) { |
| 793 | write_unlock(&n->lock); |
| 794 | goto next_elt; |
| 795 | } |
| 796 | |
| 797 | if (time_before(n->used, n->confirmed)) |
| 798 | n->used = n->confirmed; |
| 799 | |
| 800 | if (atomic_read(&n->refcnt) == 1 && |
| 801 | (state == NUD_FAILED || |
| 802 | time_after(jiffies, n->used + n->parms->gc_staletime))) { |
| 803 | *np = n->next; |
| 804 | n->dead = 1; |
| 805 | write_unlock(&n->lock); |
| 806 | neigh_cleanup_and_release(n); |
| 807 | continue; |
| 808 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 809 | write_unlock(&n->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 810 | |
| 811 | next_elt: |
Eric Dumazet | e4c4e44 | 2009-07-30 03:15:07 +0000 | [diff] [blame] | 812 | np = &n->next; |
| 813 | } |
| 814 | /* |
| 815 | * It's fine to release lock here, even if hash table |
| 816 | * grows while we are preempted. |
| 817 | */ |
| 818 | write_unlock_bh(&tbl->lock); |
| 819 | cond_resched(); |
| 820 | write_lock_bh(&tbl->lock); |
Michel Machado | 84338a6 | 2012-02-21 16:04:13 -0500 | [diff] [blame] | 821 | nht = rcu_dereference_protected(tbl->nht, |
| 822 | lockdep_is_held(&tbl->lock)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 823 | } |
YOSHIFUJI Hideaki / 吉藤英明 | 2724680 | 2013-01-22 05:20:05 +0000 | [diff] [blame] | 824 | out: |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 825 | /* Cycle through all hash buckets every base_reachable_time/2 ticks. |
| 826 | * ARP entry timeouts range from 1/2 base_reachable_time to 3/2 |
| 827 | * base_reachable_time. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 828 | */ |
Eric Dumazet | e4c4e44 | 2009-07-30 03:15:07 +0000 | [diff] [blame] | 829 | schedule_delayed_work(&tbl->gc_work, |
| 830 | tbl->parms.base_reachable_time >> 1); |
| 831 | write_unlock_bh(&tbl->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 832 | } |
| 833 | |
| 834 | static __inline__ int neigh_max_probes(struct neighbour *n) |
| 835 | { |
| 836 | struct neigh_parms *p = n->parms; |
Eric Dumazet | a02cec2 | 2010-09-22 20:43:57 +0000 | [diff] [blame] | 837 | return (n->nud_state & NUD_PROBE) ? |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 838 | p->ucast_probes : |
Eric Dumazet | a02cec2 | 2010-09-22 20:43:57 +0000 | [diff] [blame] | 839 | p->ucast_probes + p->app_probes + p->mcast_probes; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 840 | } |
| 841 | |
Timo Teras | 5ef12d9 | 2009-06-11 04:16:28 -0700 | [diff] [blame] | 842 | static void neigh_invalidate(struct neighbour *neigh) |
Eric Dumazet | 0a14150 | 2010-03-09 19:40:54 +0000 | [diff] [blame] | 843 | __releases(neigh->lock) |
| 844 | __acquires(neigh->lock) |
Timo Teras | 5ef12d9 | 2009-06-11 04:16:28 -0700 | [diff] [blame] | 845 | { |
| 846 | struct sk_buff *skb; |
| 847 | |
| 848 | NEIGH_CACHE_STAT_INC(neigh->tbl, res_failed); |
Joe Perches | d5d427c | 2013-04-15 15:17:19 +0000 | [diff] [blame] | 849 | neigh_dbg(2, "neigh %p is failed\n", neigh); |
Timo Teras | 5ef12d9 | 2009-06-11 04:16:28 -0700 | [diff] [blame] | 850 | neigh->updated = jiffies; |
| 851 | |
| 852 | /* It is very thin place. report_unreachable is very complicated |
| 853 | routine. Particularly, it can hit the same neighbour entry! |
| 854 | |
| 855 | So that, we try to be accurate and avoid dead loop. --ANK |
| 856 | */ |
| 857 | while (neigh->nud_state == NUD_FAILED && |
| 858 | (skb = __skb_dequeue(&neigh->arp_queue)) != NULL) { |
| 859 | write_unlock(&neigh->lock); |
| 860 | neigh->ops->error_report(neigh, skb); |
| 861 | write_lock(&neigh->lock); |
| 862 | } |
Eric Dumazet | c9ab4d8 | 2013-06-28 02:37:42 -0700 | [diff] [blame] | 863 | __skb_queue_purge(&neigh->arp_queue); |
Eric Dumazet | 8b5c171 | 2011-11-09 12:07:14 +0000 | [diff] [blame] | 864 | neigh->arp_queue_len_bytes = 0; |
Timo Teras | 5ef12d9 | 2009-06-11 04:16:28 -0700 | [diff] [blame] | 865 | } |
| 866 | |
Eric Dumazet | cd28ca0 | 2011-08-09 08:15:58 +0000 | [diff] [blame] | 867 | static void neigh_probe(struct neighbour *neigh) |
| 868 | __releases(neigh->lock) |
| 869 | { |
| 870 | struct sk_buff *skb = skb_peek(&neigh->arp_queue); |
| 871 | /* keep skb alive even if arp_queue overflows */ |
| 872 | if (skb) |
| 873 | skb = skb_copy(skb, GFP_ATOMIC); |
| 874 | write_unlock(&neigh->lock); |
| 875 | neigh->ops->solicit(neigh, skb); |
| 876 | atomic_inc(&neigh->probes); |
| 877 | kfree_skb(skb); |
| 878 | } |
| 879 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 880 | /* Called when a timer expires for a neighbour entry. */ |
| 881 | |
| 882 | static void neigh_timer_handler(unsigned long arg) |
| 883 | { |
| 884 | unsigned long now, next; |
| 885 | struct neighbour *neigh = (struct neighbour *)arg; |
Eric Dumazet | 95c9617 | 2012-04-15 05:58:06 +0000 | [diff] [blame] | 886 | unsigned int state; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 887 | int notify = 0; |
| 888 | |
| 889 | write_lock(&neigh->lock); |
| 890 | |
| 891 | state = neigh->nud_state; |
| 892 | now = jiffies; |
| 893 | next = now + HZ; |
| 894 | |
David S. Miller | 045f7b3 | 2011-11-01 17:45:55 -0400 | [diff] [blame] | 895 | if (!(state & NUD_IN_TIMER)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 896 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 897 | |
| 898 | if (state & NUD_REACHABLE) { |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 899 | if (time_before_eq(now, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 900 | neigh->confirmed + neigh->parms->reachable_time)) { |
Joe Perches | d5d427c | 2013-04-15 15:17:19 +0000 | [diff] [blame] | 901 | neigh_dbg(2, "neigh %p is still alive\n", neigh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 902 | next = neigh->confirmed + neigh->parms->reachable_time; |
| 903 | } else if (time_before_eq(now, |
| 904 | neigh->used + neigh->parms->delay_probe_time)) { |
Joe Perches | d5d427c | 2013-04-15 15:17:19 +0000 | [diff] [blame] | 905 | neigh_dbg(2, "neigh %p is delayed\n", neigh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 906 | neigh->nud_state = NUD_DELAY; |
YOSHIFUJI Hideaki | 955aaa2 | 2006-03-20 16:52:52 -0800 | [diff] [blame] | 907 | neigh->updated = jiffies; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 908 | neigh_suspect(neigh); |
| 909 | next = now + neigh->parms->delay_probe_time; |
| 910 | } else { |
Joe Perches | d5d427c | 2013-04-15 15:17:19 +0000 | [diff] [blame] | 911 | neigh_dbg(2, "neigh %p is suspected\n", neigh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 912 | neigh->nud_state = NUD_STALE; |
YOSHIFUJI Hideaki | 955aaa2 | 2006-03-20 16:52:52 -0800 | [diff] [blame] | 913 | neigh->updated = jiffies; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 914 | neigh_suspect(neigh); |
Tom Tucker | 8d71740 | 2006-07-30 20:43:36 -0700 | [diff] [blame] | 915 | notify = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 916 | } |
| 917 | } else if (state & NUD_DELAY) { |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 918 | if (time_before_eq(now, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 919 | neigh->confirmed + neigh->parms->delay_probe_time)) { |
Joe Perches | d5d427c | 2013-04-15 15:17:19 +0000 | [diff] [blame] | 920 | neigh_dbg(2, "neigh %p is now reachable\n", neigh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 921 | neigh->nud_state = NUD_REACHABLE; |
YOSHIFUJI Hideaki | 955aaa2 | 2006-03-20 16:52:52 -0800 | [diff] [blame] | 922 | neigh->updated = jiffies; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 923 | neigh_connect(neigh); |
Tom Tucker | 8d71740 | 2006-07-30 20:43:36 -0700 | [diff] [blame] | 924 | notify = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 925 | next = neigh->confirmed + neigh->parms->reachable_time; |
| 926 | } else { |
Joe Perches | d5d427c | 2013-04-15 15:17:19 +0000 | [diff] [blame] | 927 | neigh_dbg(2, "neigh %p is probed\n", neigh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 928 | neigh->nud_state = NUD_PROBE; |
YOSHIFUJI Hideaki | 955aaa2 | 2006-03-20 16:52:52 -0800 | [diff] [blame] | 929 | neigh->updated = jiffies; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 930 | atomic_set(&neigh->probes, 0); |
| 931 | next = now + neigh->parms->retrans_time; |
| 932 | } |
| 933 | } else { |
| 934 | /* NUD_PROBE|NUD_INCOMPLETE */ |
| 935 | next = now + neigh->parms->retrans_time; |
| 936 | } |
| 937 | |
| 938 | if ((neigh->nud_state & (NUD_INCOMPLETE | NUD_PROBE)) && |
| 939 | atomic_read(&neigh->probes) >= neigh_max_probes(neigh)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 940 | neigh->nud_state = NUD_FAILED; |
| 941 | notify = 1; |
Timo Teras | 5ef12d9 | 2009-06-11 04:16:28 -0700 | [diff] [blame] | 942 | neigh_invalidate(neigh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 943 | } |
| 944 | |
| 945 | if (neigh->nud_state & NUD_IN_TIMER) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 946 | if (time_before(next, jiffies + HZ/2)) |
| 947 | next = jiffies + HZ/2; |
Herbert Xu | 6fb9974 | 2005-10-23 16:37:48 +1000 | [diff] [blame] | 948 | if (!mod_timer(&neigh->timer, next)) |
| 949 | neigh_hold(neigh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 950 | } |
| 951 | if (neigh->nud_state & (NUD_INCOMPLETE | NUD_PROBE)) { |
Eric Dumazet | cd28ca0 | 2011-08-09 08:15:58 +0000 | [diff] [blame] | 952 | neigh_probe(neigh); |
David S. Miller | 9ff5660 | 2008-02-17 18:39:54 -0800 | [diff] [blame] | 953 | } else { |
David S. Miller | 69cc64d | 2008-02-11 21:45:44 -0800 | [diff] [blame] | 954 | out: |
David S. Miller | 9ff5660 | 2008-02-17 18:39:54 -0800 | [diff] [blame] | 955 | write_unlock(&neigh->lock); |
| 956 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 957 | |
Thomas Graf | d961db3 | 2007-08-08 23:12:56 -0700 | [diff] [blame] | 958 | if (notify) |
| 959 | neigh_update_notify(neigh); |
| 960 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 961 | neigh_release(neigh); |
| 962 | } |
| 963 | |
| 964 | int __neigh_event_send(struct neighbour *neigh, struct sk_buff *skb) |
| 965 | { |
| 966 | int rc; |
Eric Dumazet | cd28ca0 | 2011-08-09 08:15:58 +0000 | [diff] [blame] | 967 | bool immediate_probe = false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 968 | |
| 969 | write_lock_bh(&neigh->lock); |
| 970 | |
| 971 | rc = 0; |
| 972 | if (neigh->nud_state & (NUD_CONNECTED | NUD_DELAY | NUD_PROBE)) |
| 973 | goto out_unlock_bh; |
| 974 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 975 | if (!(neigh->nud_state & (NUD_STALE | NUD_INCOMPLETE))) { |
| 976 | if (neigh->parms->mcast_probes + neigh->parms->app_probes) { |
Eric Dumazet | cd28ca0 | 2011-08-09 08:15:58 +0000 | [diff] [blame] | 977 | unsigned long next, now = jiffies; |
| 978 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 979 | atomic_set(&neigh->probes, neigh->parms->ucast_probes); |
| 980 | neigh->nud_state = NUD_INCOMPLETE; |
Eric Dumazet | cd28ca0 | 2011-08-09 08:15:58 +0000 | [diff] [blame] | 981 | neigh->updated = now; |
| 982 | next = now + max(neigh->parms->retrans_time, HZ/2); |
| 983 | neigh_add_timer(neigh, next); |
| 984 | immediate_probe = true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 985 | } else { |
| 986 | neigh->nud_state = NUD_FAILED; |
YOSHIFUJI Hideaki | 955aaa2 | 2006-03-20 16:52:52 -0800 | [diff] [blame] | 987 | neigh->updated = jiffies; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 988 | write_unlock_bh(&neigh->lock); |
| 989 | |
Wei Yongjun | f3fbbe0 | 2009-02-25 00:37:32 +0000 | [diff] [blame] | 990 | kfree_skb(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 991 | return 1; |
| 992 | } |
| 993 | } else if (neigh->nud_state & NUD_STALE) { |
Joe Perches | d5d427c | 2013-04-15 15:17:19 +0000 | [diff] [blame] | 994 | neigh_dbg(2, "neigh %p is delayed\n", neigh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 995 | neigh->nud_state = NUD_DELAY; |
YOSHIFUJI Hideaki | 955aaa2 | 2006-03-20 16:52:52 -0800 | [diff] [blame] | 996 | neigh->updated = jiffies; |
David S. Miller | 667347f | 2005-09-27 12:07:44 -0700 | [diff] [blame] | 997 | neigh_add_timer(neigh, |
| 998 | jiffies + neigh->parms->delay_probe_time); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 999 | } |
| 1000 | |
| 1001 | if (neigh->nud_state == NUD_INCOMPLETE) { |
| 1002 | if (skb) { |
Eric Dumazet | 8b5c171 | 2011-11-09 12:07:14 +0000 | [diff] [blame] | 1003 | while (neigh->arp_queue_len_bytes + skb->truesize > |
| 1004 | neigh->parms->queue_len_bytes) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1005 | struct sk_buff *buff; |
Eric Dumazet | 8b5c171 | 2011-11-09 12:07:14 +0000 | [diff] [blame] | 1006 | |
David S. Miller | f72051b | 2008-09-23 01:11:18 -0700 | [diff] [blame] | 1007 | buff = __skb_dequeue(&neigh->arp_queue); |
Eric Dumazet | 8b5c171 | 2011-11-09 12:07:14 +0000 | [diff] [blame] | 1008 | if (!buff) |
| 1009 | break; |
| 1010 | neigh->arp_queue_len_bytes -= buff->truesize; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1011 | kfree_skb(buff); |
Neil Horman | 9a6d276 | 2008-07-16 20:50:49 -0700 | [diff] [blame] | 1012 | NEIGH_CACHE_STAT_INC(neigh->tbl, unres_discards); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1013 | } |
Eric Dumazet | a473113 | 2010-05-27 16:09:39 -0700 | [diff] [blame] | 1014 | skb_dst_force(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1015 | __skb_queue_tail(&neigh->arp_queue, skb); |
Eric Dumazet | 8b5c171 | 2011-11-09 12:07:14 +0000 | [diff] [blame] | 1016 | neigh->arp_queue_len_bytes += skb->truesize; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1017 | } |
| 1018 | rc = 1; |
| 1019 | } |
| 1020 | out_unlock_bh: |
Eric Dumazet | cd28ca0 | 2011-08-09 08:15:58 +0000 | [diff] [blame] | 1021 | if (immediate_probe) |
| 1022 | neigh_probe(neigh); |
| 1023 | else |
| 1024 | write_unlock(&neigh->lock); |
| 1025 | local_bh_enable(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1026 | return rc; |
| 1027 | } |
YOSHIFUJI Hideaki | 0a20450 | 2008-03-24 18:39:10 +0900 | [diff] [blame] | 1028 | EXPORT_SYMBOL(__neigh_event_send); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1029 | |
David S. Miller | f6b72b6 | 2011-07-14 07:53:20 -0700 | [diff] [blame] | 1030 | static void neigh_update_hhs(struct neighbour *neigh) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1031 | { |
| 1032 | struct hh_cache *hh; |
Stephen Hemminger | 3b04ddd | 2007-10-09 01:40:57 -0700 | [diff] [blame] | 1033 | void (*update)(struct hh_cache*, const struct net_device*, const unsigned char *) |
Doug Kehn | 91a72a7 | 2010-07-14 18:02:16 -0700 | [diff] [blame] | 1034 | = NULL; |
| 1035 | |
| 1036 | if (neigh->dev->header_ops) |
| 1037 | update = neigh->dev->header_ops->cache_update; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1038 | |
| 1039 | if (update) { |
David S. Miller | f6b72b6 | 2011-07-14 07:53:20 -0700 | [diff] [blame] | 1040 | hh = &neigh->hh; |
| 1041 | if (hh->hh_len) { |
Stephen Hemminger | 3644f0c | 2006-12-07 15:08:17 -0800 | [diff] [blame] | 1042 | write_seqlock_bh(&hh->hh_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1043 | update(hh, neigh->dev, neigh->ha); |
Stephen Hemminger | 3644f0c | 2006-12-07 15:08:17 -0800 | [diff] [blame] | 1044 | write_sequnlock_bh(&hh->hh_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1045 | } |
| 1046 | } |
| 1047 | } |
| 1048 | |
| 1049 | |
| 1050 | |
| 1051 | /* Generic update routine. |
| 1052 | -- lladdr is new lladdr or NULL, if it is not supplied. |
| 1053 | -- new is new state. |
| 1054 | -- flags |
| 1055 | NEIGH_UPDATE_F_OVERRIDE allows to override existing lladdr, |
| 1056 | if it is different. |
| 1057 | NEIGH_UPDATE_F_WEAK_OVERRIDE will suspect existing "connected" |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1058 | lladdr instead of overriding it |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1059 | if it is different. |
| 1060 | It also allows to retain current state |
| 1061 | if lladdr is unchanged. |
| 1062 | NEIGH_UPDATE_F_ADMIN means that the change is administrative. |
| 1063 | |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1064 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER allows to override existing |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1065 | NTF_ROUTER flag. |
| 1066 | NEIGH_UPDATE_F_ISROUTER indicates if the neighbour is known as |
| 1067 | a router. |
| 1068 | |
| 1069 | Caller MUST hold reference count on the entry. |
| 1070 | */ |
| 1071 | |
| 1072 | int neigh_update(struct neighbour *neigh, const u8 *lladdr, u8 new, |
| 1073 | u32 flags) |
| 1074 | { |
| 1075 | u8 old; |
| 1076 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1077 | int notify = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1078 | struct net_device *dev; |
| 1079 | int update_isrouter = 0; |
| 1080 | |
| 1081 | write_lock_bh(&neigh->lock); |
| 1082 | |
| 1083 | dev = neigh->dev; |
| 1084 | old = neigh->nud_state; |
| 1085 | err = -EPERM; |
| 1086 | |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1087 | if (!(flags & NEIGH_UPDATE_F_ADMIN) && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1088 | (old & (NUD_NOARP | NUD_PERMANENT))) |
| 1089 | goto out; |
| 1090 | |
| 1091 | if (!(new & NUD_VALID)) { |
| 1092 | neigh_del_timer(neigh); |
| 1093 | if (old & NUD_CONNECTED) |
| 1094 | neigh_suspect(neigh); |
| 1095 | neigh->nud_state = new; |
| 1096 | err = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1097 | notify = old & NUD_VALID; |
Timo Teras | 5ef12d9 | 2009-06-11 04:16:28 -0700 | [diff] [blame] | 1098 | if ((old & (NUD_INCOMPLETE | NUD_PROBE)) && |
| 1099 | (new & NUD_FAILED)) { |
| 1100 | neigh_invalidate(neigh); |
| 1101 | notify = 1; |
| 1102 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1103 | goto out; |
| 1104 | } |
| 1105 | |
| 1106 | /* Compare new lladdr with cached one */ |
| 1107 | if (!dev->addr_len) { |
| 1108 | /* First case: device needs no address. */ |
| 1109 | lladdr = neigh->ha; |
| 1110 | } else if (lladdr) { |
| 1111 | /* The second case: if something is already cached |
| 1112 | and a new address is proposed: |
| 1113 | - compare new & old |
| 1114 | - if they are different, check override flag |
| 1115 | */ |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1116 | if ((old & NUD_VALID) && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1117 | !memcmp(lladdr, neigh->ha, dev->addr_len)) |
| 1118 | lladdr = neigh->ha; |
| 1119 | } else { |
| 1120 | /* No address is supplied; if we know something, |
| 1121 | use it, otherwise discard the request. |
| 1122 | */ |
| 1123 | err = -EINVAL; |
| 1124 | if (!(old & NUD_VALID)) |
| 1125 | goto out; |
| 1126 | lladdr = neigh->ha; |
| 1127 | } |
| 1128 | |
| 1129 | if (new & NUD_CONNECTED) |
| 1130 | neigh->confirmed = jiffies; |
| 1131 | neigh->updated = jiffies; |
| 1132 | |
| 1133 | /* If entry was valid and address is not changed, |
| 1134 | do not change entry state, if new one is STALE. |
| 1135 | */ |
| 1136 | err = 0; |
| 1137 | update_isrouter = flags & NEIGH_UPDATE_F_OVERRIDE_ISROUTER; |
| 1138 | if (old & NUD_VALID) { |
| 1139 | if (lladdr != neigh->ha && !(flags & NEIGH_UPDATE_F_OVERRIDE)) { |
| 1140 | update_isrouter = 0; |
| 1141 | if ((flags & NEIGH_UPDATE_F_WEAK_OVERRIDE) && |
| 1142 | (old & NUD_CONNECTED)) { |
| 1143 | lladdr = neigh->ha; |
| 1144 | new = NUD_STALE; |
| 1145 | } else |
| 1146 | goto out; |
| 1147 | } else { |
| 1148 | if (lladdr == neigh->ha && new == NUD_STALE && |
| 1149 | ((flags & NEIGH_UPDATE_F_WEAK_OVERRIDE) || |
| 1150 | (old & NUD_CONNECTED)) |
| 1151 | ) |
| 1152 | new = old; |
| 1153 | } |
| 1154 | } |
| 1155 | |
| 1156 | if (new != old) { |
| 1157 | neigh_del_timer(neigh); |
Pavel Emelyanov | a43d899 | 2007-12-20 15:49:05 -0800 | [diff] [blame] | 1158 | if (new & NUD_IN_TIMER) |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1159 | neigh_add_timer(neigh, (jiffies + |
| 1160 | ((new & NUD_REACHABLE) ? |
David S. Miller | 667347f | 2005-09-27 12:07:44 -0700 | [diff] [blame] | 1161 | neigh->parms->reachable_time : |
| 1162 | 0))); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1163 | neigh->nud_state = new; |
| 1164 | } |
| 1165 | |
| 1166 | if (lladdr != neigh->ha) { |
Eric Dumazet | 0ed8ddf | 2010-10-07 10:44:07 +0000 | [diff] [blame] | 1167 | write_seqlock(&neigh->ha_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1168 | memcpy(&neigh->ha, lladdr, dev->addr_len); |
Eric Dumazet | 0ed8ddf | 2010-10-07 10:44:07 +0000 | [diff] [blame] | 1169 | write_sequnlock(&neigh->ha_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1170 | neigh_update_hhs(neigh); |
| 1171 | if (!(new & NUD_CONNECTED)) |
| 1172 | neigh->confirmed = jiffies - |
| 1173 | (neigh->parms->base_reachable_time << 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1174 | notify = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1175 | } |
| 1176 | if (new == old) |
| 1177 | goto out; |
| 1178 | if (new & NUD_CONNECTED) |
| 1179 | neigh_connect(neigh); |
| 1180 | else |
| 1181 | neigh_suspect(neigh); |
| 1182 | if (!(old & NUD_VALID)) { |
| 1183 | struct sk_buff *skb; |
| 1184 | |
| 1185 | /* Again: avoid dead loop if something went wrong */ |
| 1186 | |
| 1187 | while (neigh->nud_state & NUD_VALID && |
| 1188 | (skb = __skb_dequeue(&neigh->arp_queue)) != NULL) { |
David S. Miller | 69cce1d | 2011-07-17 23:09:49 -0700 | [diff] [blame] | 1189 | struct dst_entry *dst = skb_dst(skb); |
| 1190 | struct neighbour *n2, *n1 = neigh; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1191 | write_unlock_bh(&neigh->lock); |
roy.qing.li@gmail.com | e049f28 | 2011-10-17 22:32:42 +0000 | [diff] [blame] | 1192 | |
| 1193 | rcu_read_lock(); |
David S. Miller | 13a43d9 | 2012-07-02 22:15:37 -0700 | [diff] [blame] | 1194 | |
| 1195 | /* Why not just use 'neigh' as-is? The problem is that |
| 1196 | * things such as shaper, eql, and sch_teql can end up |
| 1197 | * using alternative, different, neigh objects to output |
| 1198 | * the packet in the output path. So what we need to do |
| 1199 | * here is re-lookup the top-level neigh in the path so |
| 1200 | * we can reinject the packet there. |
| 1201 | */ |
| 1202 | n2 = NULL; |
| 1203 | if (dst) { |
| 1204 | n2 = dst_neigh_lookup_skb(dst, skb); |
| 1205 | if (n2) |
| 1206 | n1 = n2; |
| 1207 | } |
David S. Miller | 8f40b16 | 2011-07-17 13:34:11 -0700 | [diff] [blame] | 1208 | n1->output(n1, skb); |
David S. Miller | 13a43d9 | 2012-07-02 22:15:37 -0700 | [diff] [blame] | 1209 | if (n2) |
| 1210 | neigh_release(n2); |
roy.qing.li@gmail.com | e049f28 | 2011-10-17 22:32:42 +0000 | [diff] [blame] | 1211 | rcu_read_unlock(); |
| 1212 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1213 | write_lock_bh(&neigh->lock); |
| 1214 | } |
Eric Dumazet | c9ab4d8 | 2013-06-28 02:37:42 -0700 | [diff] [blame] | 1215 | __skb_queue_purge(&neigh->arp_queue); |
Eric Dumazet | 8b5c171 | 2011-11-09 12:07:14 +0000 | [diff] [blame] | 1216 | neigh->arp_queue_len_bytes = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1217 | } |
| 1218 | out: |
| 1219 | if (update_isrouter) { |
| 1220 | neigh->flags = (flags & NEIGH_UPDATE_F_ISROUTER) ? |
| 1221 | (neigh->flags | NTF_ROUTER) : |
| 1222 | (neigh->flags & ~NTF_ROUTER); |
| 1223 | } |
| 1224 | write_unlock_bh(&neigh->lock); |
Tom Tucker | 8d71740 | 2006-07-30 20:43:36 -0700 | [diff] [blame] | 1225 | |
| 1226 | if (notify) |
Thomas Graf | d961db3 | 2007-08-08 23:12:56 -0700 | [diff] [blame] | 1227 | neigh_update_notify(neigh); |
| 1228 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1229 | return err; |
| 1230 | } |
YOSHIFUJI Hideaki | 0a20450 | 2008-03-24 18:39:10 +0900 | [diff] [blame] | 1231 | EXPORT_SYMBOL(neigh_update); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1232 | |
| 1233 | struct neighbour *neigh_event_ns(struct neigh_table *tbl, |
| 1234 | u8 *lladdr, void *saddr, |
| 1235 | struct net_device *dev) |
| 1236 | { |
| 1237 | struct neighbour *neigh = __neigh_lookup(tbl, saddr, dev, |
| 1238 | lladdr || !dev->addr_len); |
| 1239 | if (neigh) |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1240 | neigh_update(neigh, lladdr, NUD_STALE, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1241 | NEIGH_UPDATE_F_OVERRIDE); |
| 1242 | return neigh; |
| 1243 | } |
YOSHIFUJI Hideaki | 0a20450 | 2008-03-24 18:39:10 +0900 | [diff] [blame] | 1244 | EXPORT_SYMBOL(neigh_event_ns); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1245 | |
Eric Dumazet | 34d101d | 2010-10-11 09:16:57 -0700 | [diff] [blame] | 1246 | /* called with read_lock_bh(&n->lock); */ |
David S. Miller | f6b72b6 | 2011-07-14 07:53:20 -0700 | [diff] [blame] | 1247 | static void neigh_hh_init(struct neighbour *n, struct dst_entry *dst) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1248 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1249 | struct net_device *dev = dst->dev; |
David S. Miller | f6b72b6 | 2011-07-14 07:53:20 -0700 | [diff] [blame] | 1250 | __be16 prot = dst->ops->protocol; |
| 1251 | struct hh_cache *hh = &n->hh; |
Eric Dumazet | 0ed8ddf | 2010-10-07 10:44:07 +0000 | [diff] [blame] | 1252 | |
| 1253 | write_lock_bh(&n->lock); |
Eric Dumazet | 34d101d | 2010-10-11 09:16:57 -0700 | [diff] [blame] | 1254 | |
David S. Miller | f6b72b6 | 2011-07-14 07:53:20 -0700 | [diff] [blame] | 1255 | /* Only one thread can come in here and initialize the |
| 1256 | * hh_cache entry. |
| 1257 | */ |
David S. Miller | b23b545 | 2011-07-16 17:45:02 -0700 | [diff] [blame] | 1258 | if (!hh->hh_len) |
| 1259 | dev->header_ops->cache(n, hh, prot); |
David S. Miller | f6b72b6 | 2011-07-14 07:53:20 -0700 | [diff] [blame] | 1260 | |
Eric Dumazet | 0ed8ddf | 2010-10-07 10:44:07 +0000 | [diff] [blame] | 1261 | write_unlock_bh(&n->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1262 | } |
| 1263 | |
| 1264 | /* This function can be used in contexts, where only old dev_queue_xmit |
Eric Dumazet | 767e97e | 2010-10-06 17:49:21 -0700 | [diff] [blame] | 1265 | * worked, f.e. if you want to override normal output path (eql, shaper), |
| 1266 | * but resolution is not made yet. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1267 | */ |
| 1268 | |
David S. Miller | 8f40b16 | 2011-07-17 13:34:11 -0700 | [diff] [blame] | 1269 | int neigh_compat_output(struct neighbour *neigh, struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1270 | { |
| 1271 | struct net_device *dev = skb->dev; |
| 1272 | |
Arnaldo Carvalho de Melo | bbe735e | 2007-03-10 22:16:10 -0300 | [diff] [blame] | 1273 | __skb_pull(skb, skb_network_offset(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1274 | |
Stephen Hemminger | 0c4e858 | 2007-10-09 01:36:32 -0700 | [diff] [blame] | 1275 | if (dev_hard_header(skb, dev, ntohs(skb->protocol), NULL, NULL, |
| 1276 | skb->len) < 0 && |
Stephen Hemminger | 3b04ddd | 2007-10-09 01:40:57 -0700 | [diff] [blame] | 1277 | dev->header_ops->rebuild(skb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1278 | return 0; |
| 1279 | |
| 1280 | return dev_queue_xmit(skb); |
| 1281 | } |
YOSHIFUJI Hideaki | 0a20450 | 2008-03-24 18:39:10 +0900 | [diff] [blame] | 1282 | EXPORT_SYMBOL(neigh_compat_output); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1283 | |
| 1284 | /* Slow and careful. */ |
| 1285 | |
David S. Miller | 8f40b16 | 2011-07-17 13:34:11 -0700 | [diff] [blame] | 1286 | int neigh_resolve_output(struct neighbour *neigh, struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1287 | { |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 1288 | struct dst_entry *dst = skb_dst(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1289 | int rc = 0; |
| 1290 | |
David S. Miller | 8f40b16 | 2011-07-17 13:34:11 -0700 | [diff] [blame] | 1291 | if (!dst) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1292 | goto discard; |
| 1293 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1294 | if (!neigh_event_send(neigh, skb)) { |
| 1295 | int err; |
| 1296 | struct net_device *dev = neigh->dev; |
Eric Dumazet | 0ed8ddf | 2010-10-07 10:44:07 +0000 | [diff] [blame] | 1297 | unsigned int seq; |
Eric Dumazet | 34d101d | 2010-10-11 09:16:57 -0700 | [diff] [blame] | 1298 | |
David S. Miller | f6b72b6 | 2011-07-14 07:53:20 -0700 | [diff] [blame] | 1299 | if (dev->header_ops->cache && !neigh->hh.hh_len) |
| 1300 | neigh_hh_init(neigh, dst); |
Eric Dumazet | 34d101d | 2010-10-11 09:16:57 -0700 | [diff] [blame] | 1301 | |
Eric Dumazet | 0ed8ddf | 2010-10-07 10:44:07 +0000 | [diff] [blame] | 1302 | do { |
ramesh.nagappa@gmail.com | e1f1650 | 2012-10-05 19:10:15 +0000 | [diff] [blame] | 1303 | __skb_pull(skb, skb_network_offset(skb)); |
Eric Dumazet | 0ed8ddf | 2010-10-07 10:44:07 +0000 | [diff] [blame] | 1304 | seq = read_seqbegin(&neigh->ha_lock); |
| 1305 | err = dev_hard_header(skb, dev, ntohs(skb->protocol), |
| 1306 | neigh->ha, NULL, skb->len); |
| 1307 | } while (read_seqretry(&neigh->ha_lock, seq)); |
Eric Dumazet | 34d101d | 2010-10-11 09:16:57 -0700 | [diff] [blame] | 1308 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1309 | if (err >= 0) |
David S. Miller | 542d4d6 | 2011-07-16 18:06:24 -0700 | [diff] [blame] | 1310 | rc = dev_queue_xmit(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1311 | else |
| 1312 | goto out_kfree_skb; |
| 1313 | } |
| 1314 | out: |
| 1315 | return rc; |
| 1316 | discard: |
Joe Perches | d5d427c | 2013-04-15 15:17:19 +0000 | [diff] [blame] | 1317 | neigh_dbg(1, "%s: dst=%p neigh=%p\n", __func__, dst, neigh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1318 | out_kfree_skb: |
| 1319 | rc = -EINVAL; |
| 1320 | kfree_skb(skb); |
| 1321 | goto out; |
| 1322 | } |
YOSHIFUJI Hideaki | 0a20450 | 2008-03-24 18:39:10 +0900 | [diff] [blame] | 1323 | EXPORT_SYMBOL(neigh_resolve_output); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1324 | |
| 1325 | /* As fast as possible without hh cache */ |
| 1326 | |
David S. Miller | 8f40b16 | 2011-07-17 13:34:11 -0700 | [diff] [blame] | 1327 | int neigh_connected_output(struct neighbour *neigh, struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1328 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1329 | struct net_device *dev = neigh->dev; |
Eric Dumazet | 0ed8ddf | 2010-10-07 10:44:07 +0000 | [diff] [blame] | 1330 | unsigned int seq; |
David S. Miller | 8f40b16 | 2011-07-17 13:34:11 -0700 | [diff] [blame] | 1331 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1332 | |
Eric Dumazet | 0ed8ddf | 2010-10-07 10:44:07 +0000 | [diff] [blame] | 1333 | do { |
ramesh.nagappa@gmail.com | e1f1650 | 2012-10-05 19:10:15 +0000 | [diff] [blame] | 1334 | __skb_pull(skb, skb_network_offset(skb)); |
Eric Dumazet | 0ed8ddf | 2010-10-07 10:44:07 +0000 | [diff] [blame] | 1335 | seq = read_seqbegin(&neigh->ha_lock); |
| 1336 | err = dev_hard_header(skb, dev, ntohs(skb->protocol), |
| 1337 | neigh->ha, NULL, skb->len); |
| 1338 | } while (read_seqretry(&neigh->ha_lock, seq)); |
| 1339 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1340 | if (err >= 0) |
David S. Miller | 542d4d6 | 2011-07-16 18:06:24 -0700 | [diff] [blame] | 1341 | err = dev_queue_xmit(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1342 | else { |
| 1343 | err = -EINVAL; |
| 1344 | kfree_skb(skb); |
| 1345 | } |
| 1346 | return err; |
| 1347 | } |
YOSHIFUJI Hideaki | 0a20450 | 2008-03-24 18:39:10 +0900 | [diff] [blame] | 1348 | EXPORT_SYMBOL(neigh_connected_output); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1349 | |
David S. Miller | 8f40b16 | 2011-07-17 13:34:11 -0700 | [diff] [blame] | 1350 | int neigh_direct_output(struct neighbour *neigh, struct sk_buff *skb) |
| 1351 | { |
| 1352 | return dev_queue_xmit(skb); |
| 1353 | } |
| 1354 | EXPORT_SYMBOL(neigh_direct_output); |
| 1355 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1356 | static void neigh_proxy_process(unsigned long arg) |
| 1357 | { |
| 1358 | struct neigh_table *tbl = (struct neigh_table *)arg; |
| 1359 | long sched_next = 0; |
| 1360 | unsigned long now = jiffies; |
David S. Miller | f72051b | 2008-09-23 01:11:18 -0700 | [diff] [blame] | 1361 | struct sk_buff *skb, *n; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1362 | |
| 1363 | spin_lock(&tbl->proxy_queue.lock); |
| 1364 | |
David S. Miller | f72051b | 2008-09-23 01:11:18 -0700 | [diff] [blame] | 1365 | skb_queue_walk_safe(&tbl->proxy_queue, skb, n) { |
| 1366 | long tdif = NEIGH_CB(skb)->sched_next - now; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1367 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1368 | if (tdif <= 0) { |
David S. Miller | f72051b | 2008-09-23 01:11:18 -0700 | [diff] [blame] | 1369 | struct net_device *dev = skb->dev; |
Eric Dumazet | 20e6074 | 2011-08-22 19:32:42 +0000 | [diff] [blame] | 1370 | |
David S. Miller | f72051b | 2008-09-23 01:11:18 -0700 | [diff] [blame] | 1371 | __skb_unlink(skb, &tbl->proxy_queue); |
Eric Dumazet | 20e6074 | 2011-08-22 19:32:42 +0000 | [diff] [blame] | 1372 | if (tbl->proxy_redo && netif_running(dev)) { |
| 1373 | rcu_read_lock(); |
David S. Miller | f72051b | 2008-09-23 01:11:18 -0700 | [diff] [blame] | 1374 | tbl->proxy_redo(skb); |
Eric Dumazet | 20e6074 | 2011-08-22 19:32:42 +0000 | [diff] [blame] | 1375 | rcu_read_unlock(); |
| 1376 | } else { |
David S. Miller | f72051b | 2008-09-23 01:11:18 -0700 | [diff] [blame] | 1377 | kfree_skb(skb); |
Eric Dumazet | 20e6074 | 2011-08-22 19:32:42 +0000 | [diff] [blame] | 1378 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1379 | |
| 1380 | dev_put(dev); |
| 1381 | } else if (!sched_next || tdif < sched_next) |
| 1382 | sched_next = tdif; |
| 1383 | } |
| 1384 | del_timer(&tbl->proxy_timer); |
| 1385 | if (sched_next) |
| 1386 | mod_timer(&tbl->proxy_timer, jiffies + sched_next); |
| 1387 | spin_unlock(&tbl->proxy_queue.lock); |
| 1388 | } |
| 1389 | |
| 1390 | void pneigh_enqueue(struct neigh_table *tbl, struct neigh_parms *p, |
| 1391 | struct sk_buff *skb) |
| 1392 | { |
| 1393 | unsigned long now = jiffies; |
| 1394 | unsigned long sched_next = now + (net_random() % p->proxy_delay); |
| 1395 | |
| 1396 | if (tbl->proxy_queue.qlen > p->proxy_qlen) { |
| 1397 | kfree_skb(skb); |
| 1398 | return; |
| 1399 | } |
Patrick McHardy | a61bbcf | 2005-08-14 17:24:31 -0700 | [diff] [blame] | 1400 | |
| 1401 | NEIGH_CB(skb)->sched_next = sched_next; |
| 1402 | NEIGH_CB(skb)->flags |= LOCALLY_ENQUEUED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1403 | |
| 1404 | spin_lock(&tbl->proxy_queue.lock); |
| 1405 | if (del_timer(&tbl->proxy_timer)) { |
| 1406 | if (time_before(tbl->proxy_timer.expires, sched_next)) |
| 1407 | sched_next = tbl->proxy_timer.expires; |
| 1408 | } |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 1409 | skb_dst_drop(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1410 | dev_hold(skb->dev); |
| 1411 | __skb_queue_tail(&tbl->proxy_queue, skb); |
| 1412 | mod_timer(&tbl->proxy_timer, sched_next); |
| 1413 | spin_unlock(&tbl->proxy_queue.lock); |
| 1414 | } |
YOSHIFUJI Hideaki | 0a20450 | 2008-03-24 18:39:10 +0900 | [diff] [blame] | 1415 | EXPORT_SYMBOL(pneigh_enqueue); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1416 | |
Tobias Klauser | 97fd5bc | 2009-07-13 11:17:49 -0700 | [diff] [blame] | 1417 | static inline struct neigh_parms *lookup_neigh_parms(struct neigh_table *tbl, |
Eric W. Biederman | 426b530 | 2008-01-24 00:13:18 -0800 | [diff] [blame] | 1418 | struct net *net, int ifindex) |
| 1419 | { |
| 1420 | struct neigh_parms *p; |
| 1421 | |
| 1422 | for (p = &tbl->parms; p; p = p->next) { |
YOSHIFUJI Hideaki | 878628f | 2008-03-26 03:57:35 +0900 | [diff] [blame] | 1423 | if ((p->dev && p->dev->ifindex == ifindex && net_eq(neigh_parms_net(p), net)) || |
Gao feng | 170d6f9 | 2013-06-20 10:01:33 +0800 | [diff] [blame] | 1424 | (!p->dev && !ifindex && net_eq(net, &init_net))) |
Eric W. Biederman | 426b530 | 2008-01-24 00:13:18 -0800 | [diff] [blame] | 1425 | return p; |
| 1426 | } |
| 1427 | |
| 1428 | return NULL; |
| 1429 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1430 | |
| 1431 | struct neigh_parms *neigh_parms_alloc(struct net_device *dev, |
| 1432 | struct neigh_table *tbl) |
| 1433 | { |
Gao feng | cf89d6b | 2013-06-20 10:01:32 +0800 | [diff] [blame] | 1434 | struct neigh_parms *p; |
Stephen Hemminger | 0082982 | 2008-11-20 20:14:53 -0800 | [diff] [blame] | 1435 | struct net *net = dev_net(dev); |
| 1436 | const struct net_device_ops *ops = dev->netdev_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1437 | |
Gao feng | cf89d6b | 2013-06-20 10:01:32 +0800 | [diff] [blame] | 1438 | p = kmemdup(&tbl->parms, sizeof(*p), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1439 | if (p) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1440 | p->tbl = tbl; |
| 1441 | atomic_set(&p->refcnt, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1442 | p->reachable_time = |
| 1443 | neigh_rand_reach_time(p->base_reachable_time); |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1444 | |
Stephen Hemminger | 0082982 | 2008-11-20 20:14:53 -0800 | [diff] [blame] | 1445 | if (ops->ndo_neigh_setup && ops->ndo_neigh_setup(dev, p)) { |
Denis V. Lunev | 486b51d | 2008-01-14 22:59:59 -0800 | [diff] [blame] | 1446 | kfree(p); |
| 1447 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1448 | } |
Denis V. Lunev | 486b51d | 2008-01-14 22:59:59 -0800 | [diff] [blame] | 1449 | |
| 1450 | dev_hold(dev); |
| 1451 | p->dev = dev; |
Eric Dumazet | e42ea98 | 2008-11-12 00:54:54 -0800 | [diff] [blame] | 1452 | write_pnet(&p->net, hold_net(net)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1453 | p->sysctl_table = NULL; |
| 1454 | write_lock_bh(&tbl->lock); |
| 1455 | p->next = tbl->parms.next; |
| 1456 | tbl->parms.next = p; |
| 1457 | write_unlock_bh(&tbl->lock); |
| 1458 | } |
| 1459 | return p; |
| 1460 | } |
YOSHIFUJI Hideaki | 0a20450 | 2008-03-24 18:39:10 +0900 | [diff] [blame] | 1461 | EXPORT_SYMBOL(neigh_parms_alloc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1462 | |
| 1463 | static void neigh_rcu_free_parms(struct rcu_head *head) |
| 1464 | { |
| 1465 | struct neigh_parms *parms = |
| 1466 | container_of(head, struct neigh_parms, rcu_head); |
| 1467 | |
| 1468 | neigh_parms_put(parms); |
| 1469 | } |
| 1470 | |
| 1471 | void neigh_parms_release(struct neigh_table *tbl, struct neigh_parms *parms) |
| 1472 | { |
| 1473 | struct neigh_parms **p; |
| 1474 | |
| 1475 | if (!parms || parms == &tbl->parms) |
| 1476 | return; |
| 1477 | write_lock_bh(&tbl->lock); |
| 1478 | for (p = &tbl->parms.next; *p; p = &(*p)->next) { |
| 1479 | if (*p == parms) { |
| 1480 | *p = parms->next; |
| 1481 | parms->dead = 1; |
| 1482 | write_unlock_bh(&tbl->lock); |
David S. Miller | cecbb63 | 2008-01-20 16:39:03 -0800 | [diff] [blame] | 1483 | if (parms->dev) |
| 1484 | dev_put(parms->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1485 | call_rcu(&parms->rcu_head, neigh_rcu_free_parms); |
| 1486 | return; |
| 1487 | } |
| 1488 | } |
| 1489 | write_unlock_bh(&tbl->lock); |
Joe Perches | d5d427c | 2013-04-15 15:17:19 +0000 | [diff] [blame] | 1490 | neigh_dbg(1, "%s: not found\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1491 | } |
YOSHIFUJI Hideaki | 0a20450 | 2008-03-24 18:39:10 +0900 | [diff] [blame] | 1492 | EXPORT_SYMBOL(neigh_parms_release); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1493 | |
Denis V. Lunev | 06f0511 | 2008-01-24 00:30:58 -0800 | [diff] [blame] | 1494 | static void neigh_parms_destroy(struct neigh_parms *parms) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1495 | { |
YOSHIFUJI Hideaki | 57da52c | 2008-03-26 03:49:59 +0900 | [diff] [blame] | 1496 | release_net(neigh_parms_net(parms)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1497 | kfree(parms); |
| 1498 | } |
| 1499 | |
Pavel Emelianov | c2ecba7 | 2007-04-17 12:45:31 -0700 | [diff] [blame] | 1500 | static struct lock_class_key neigh_table_proxy_queue_class; |
| 1501 | |
Hiroaki SHIMODA | dcd2ba9 | 2012-04-13 07:34:44 +0000 | [diff] [blame] | 1502 | static void neigh_table_init_no_netlink(struct neigh_table *tbl) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1503 | { |
| 1504 | unsigned long now = jiffies; |
| 1505 | unsigned long phsize; |
| 1506 | |
Eric Dumazet | e42ea98 | 2008-11-12 00:54:54 -0800 | [diff] [blame] | 1507 | write_pnet(&tbl->parms.net, &init_net); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1508 | atomic_set(&tbl->parms.refcnt, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1509 | tbl->parms.reachable_time = |
| 1510 | neigh_rand_reach_time(tbl->parms.base_reachable_time); |
| 1511 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1512 | tbl->stats = alloc_percpu(struct neigh_statistics); |
| 1513 | if (!tbl->stats) |
| 1514 | panic("cannot create neighbour cache statistics"); |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1515 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1516 | #ifdef CONFIG_PROC_FS |
Alexey Dobriyan | 9b739ba | 2008-11-11 16:47:44 -0800 | [diff] [blame] | 1517 | if (!proc_create_data(tbl->id, 0, init_net.proc_net_stat, |
| 1518 | &neigh_stat_seq_fops, tbl)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1519 | panic("cannot create neighbour proc dir entry"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1520 | #endif |
| 1521 | |
David S. Miller | cd08933 | 2011-07-11 01:28:12 -0700 | [diff] [blame] | 1522 | RCU_INIT_POINTER(tbl->nht, neigh_hash_alloc(3)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1523 | |
| 1524 | phsize = (PNEIGH_HASHMASK + 1) * sizeof(struct pneigh_entry *); |
Andrew Morton | 77d04bd | 2006-04-07 14:52:59 -0700 | [diff] [blame] | 1525 | tbl->phash_buckets = kzalloc(phsize, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1526 | |
Eric Dumazet | d6bf781 | 2010-10-04 06:15:44 +0000 | [diff] [blame] | 1527 | if (!tbl->nht || !tbl->phash_buckets) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1528 | panic("cannot allocate neighbour cache hashes"); |
| 1529 | |
YOSHIFUJI Hideaki / 吉藤英明 | 08433ef | 2013-01-24 00:44:23 +0000 | [diff] [blame] | 1530 | if (!tbl->entry_size) |
| 1531 | tbl->entry_size = ALIGN(offsetof(struct neighbour, primary_key) + |
| 1532 | tbl->key_len, NEIGH_PRIV_ALIGN); |
| 1533 | else |
| 1534 | WARN_ON(tbl->entry_size % NEIGH_PRIV_ALIGN); |
| 1535 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1536 | rwlock_init(&tbl->lock); |
Tejun Heo | 203b42f | 2012-08-21 13:18:23 -0700 | [diff] [blame] | 1537 | INIT_DEFERRABLE_WORK(&tbl->gc_work, neigh_periodic_work); |
Eric Dumazet | e4c4e44 | 2009-07-30 03:15:07 +0000 | [diff] [blame] | 1538 | schedule_delayed_work(&tbl->gc_work, tbl->parms.reachable_time); |
Pavel Emelyanov | b24b8a2 | 2008-01-23 21:20:07 -0800 | [diff] [blame] | 1539 | setup_timer(&tbl->proxy_timer, neigh_proxy_process, (unsigned long)tbl); |
Pavel Emelianov | c2ecba7 | 2007-04-17 12:45:31 -0700 | [diff] [blame] | 1540 | skb_queue_head_init_class(&tbl->proxy_queue, |
| 1541 | &neigh_table_proxy_queue_class); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1542 | |
| 1543 | tbl->last_flush = now; |
| 1544 | tbl->last_rand = now + tbl->parms.reachable_time * 20; |
Simon Kelley | bd89efc | 2006-05-12 14:56:08 -0700 | [diff] [blame] | 1545 | } |
| 1546 | |
| 1547 | void neigh_table_init(struct neigh_table *tbl) |
| 1548 | { |
| 1549 | struct neigh_table *tmp; |
| 1550 | |
| 1551 | neigh_table_init_no_netlink(tbl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1552 | write_lock(&neigh_tbl_lock); |
Simon Kelley | bd89efc | 2006-05-12 14:56:08 -0700 | [diff] [blame] | 1553 | for (tmp = neigh_tables; tmp; tmp = tmp->next) { |
| 1554 | if (tmp->family == tbl->family) |
| 1555 | break; |
| 1556 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1557 | tbl->next = neigh_tables; |
| 1558 | neigh_tables = tbl; |
| 1559 | write_unlock(&neigh_tbl_lock); |
Simon Kelley | bd89efc | 2006-05-12 14:56:08 -0700 | [diff] [blame] | 1560 | |
| 1561 | if (unlikely(tmp)) { |
Joe Perches | e005d19 | 2012-05-16 19:58:40 +0000 | [diff] [blame] | 1562 | pr_err("Registering multiple tables for family %d\n", |
| 1563 | tbl->family); |
Simon Kelley | bd89efc | 2006-05-12 14:56:08 -0700 | [diff] [blame] | 1564 | dump_stack(); |
| 1565 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1566 | } |
YOSHIFUJI Hideaki | 0a20450 | 2008-03-24 18:39:10 +0900 | [diff] [blame] | 1567 | EXPORT_SYMBOL(neigh_table_init); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1568 | |
| 1569 | int neigh_table_clear(struct neigh_table *tbl) |
| 1570 | { |
| 1571 | struct neigh_table **tp; |
| 1572 | |
| 1573 | /* It is not clean... Fix it to unload IPv6 module safely */ |
Tejun Heo | a5c30b3 | 2010-10-19 06:04:42 +0000 | [diff] [blame] | 1574 | cancel_delayed_work_sync(&tbl->gc_work); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1575 | del_timer_sync(&tbl->proxy_timer); |
| 1576 | pneigh_queue_purge(&tbl->proxy_queue); |
| 1577 | neigh_ifdown(tbl, NULL); |
| 1578 | if (atomic_read(&tbl->entries)) |
Joe Perches | e005d19 | 2012-05-16 19:58:40 +0000 | [diff] [blame] | 1579 | pr_crit("neighbour leakage\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1580 | write_lock(&neigh_tbl_lock); |
| 1581 | for (tp = &neigh_tables; *tp; tp = &(*tp)->next) { |
| 1582 | if (*tp == tbl) { |
| 1583 | *tp = tbl->next; |
| 1584 | break; |
| 1585 | } |
| 1586 | } |
| 1587 | write_unlock(&neigh_tbl_lock); |
| 1588 | |
Eric Dumazet | 6193d2b | 2011-01-19 22:02:47 +0000 | [diff] [blame] | 1589 | call_rcu(&rcu_dereference_protected(tbl->nht, 1)->rcu, |
| 1590 | neigh_hash_free_rcu); |
Eric Dumazet | d6bf781 | 2010-10-04 06:15:44 +0000 | [diff] [blame] | 1591 | tbl->nht = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1592 | |
| 1593 | kfree(tbl->phash_buckets); |
| 1594 | tbl->phash_buckets = NULL; |
| 1595 | |
Alexey Dobriyan | 3f192b5 | 2007-11-05 21:28:13 -0800 | [diff] [blame] | 1596 | remove_proc_entry(tbl->id, init_net.proc_net_stat); |
| 1597 | |
Kirill Korotaev | 3fcde74 | 2006-09-01 01:34:10 -0700 | [diff] [blame] | 1598 | free_percpu(tbl->stats); |
| 1599 | tbl->stats = NULL; |
| 1600 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1601 | return 0; |
| 1602 | } |
YOSHIFUJI Hideaki | 0a20450 | 2008-03-24 18:39:10 +0900 | [diff] [blame] | 1603 | EXPORT_SYMBOL(neigh_table_clear); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1604 | |
Thomas Graf | 661d296 | 2013-03-21 07:45:29 +0000 | [diff] [blame] | 1605 | static int neigh_delete(struct sk_buff *skb, struct nlmsghdr *nlh) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1606 | { |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1607 | struct net *net = sock_net(skb->sk); |
Thomas Graf | a14a49d | 2006-08-07 17:53:08 -0700 | [diff] [blame] | 1608 | struct ndmsg *ndm; |
| 1609 | struct nlattr *dst_attr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1610 | struct neigh_table *tbl; |
| 1611 | struct net_device *dev = NULL; |
Thomas Graf | a14a49d | 2006-08-07 17:53:08 -0700 | [diff] [blame] | 1612 | int err = -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1613 | |
Eric Dumazet | 110b249 | 2010-10-04 04:27:36 +0000 | [diff] [blame] | 1614 | ASSERT_RTNL(); |
Thomas Graf | a14a49d | 2006-08-07 17:53:08 -0700 | [diff] [blame] | 1615 | if (nlmsg_len(nlh) < sizeof(*ndm)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1616 | goto out; |
| 1617 | |
Thomas Graf | a14a49d | 2006-08-07 17:53:08 -0700 | [diff] [blame] | 1618 | dst_attr = nlmsg_find_attr(nlh, sizeof(*ndm), NDA_DST); |
| 1619 | if (dst_attr == NULL) |
| 1620 | goto out; |
| 1621 | |
| 1622 | ndm = nlmsg_data(nlh); |
| 1623 | if (ndm->ndm_ifindex) { |
Eric Dumazet | 110b249 | 2010-10-04 04:27:36 +0000 | [diff] [blame] | 1624 | dev = __dev_get_by_index(net, ndm->ndm_ifindex); |
Thomas Graf | a14a49d | 2006-08-07 17:53:08 -0700 | [diff] [blame] | 1625 | if (dev == NULL) { |
| 1626 | err = -ENODEV; |
| 1627 | goto out; |
| 1628 | } |
| 1629 | } |
| 1630 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1631 | read_lock(&neigh_tbl_lock); |
| 1632 | for (tbl = neigh_tables; tbl; tbl = tbl->next) { |
Thomas Graf | a14a49d | 2006-08-07 17:53:08 -0700 | [diff] [blame] | 1633 | struct neighbour *neigh; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1634 | |
| 1635 | if (tbl->family != ndm->ndm_family) |
| 1636 | continue; |
| 1637 | read_unlock(&neigh_tbl_lock); |
| 1638 | |
Thomas Graf | a14a49d | 2006-08-07 17:53:08 -0700 | [diff] [blame] | 1639 | if (nla_len(dst_attr) < tbl->key_len) |
Eric Dumazet | 110b249 | 2010-10-04 04:27:36 +0000 | [diff] [blame] | 1640 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1641 | |
| 1642 | if (ndm->ndm_flags & NTF_PROXY) { |
Eric W. Biederman | 426b530 | 2008-01-24 00:13:18 -0800 | [diff] [blame] | 1643 | err = pneigh_delete(tbl, net, nla_data(dst_attr), dev); |
Eric Dumazet | 110b249 | 2010-10-04 04:27:36 +0000 | [diff] [blame] | 1644 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1645 | } |
| 1646 | |
Thomas Graf | a14a49d | 2006-08-07 17:53:08 -0700 | [diff] [blame] | 1647 | if (dev == NULL) |
Eric Dumazet | 110b249 | 2010-10-04 04:27:36 +0000 | [diff] [blame] | 1648 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1649 | |
Thomas Graf | a14a49d | 2006-08-07 17:53:08 -0700 | [diff] [blame] | 1650 | neigh = neigh_lookup(tbl, nla_data(dst_attr), dev); |
| 1651 | if (neigh == NULL) { |
| 1652 | err = -ENOENT; |
Eric Dumazet | 110b249 | 2010-10-04 04:27:36 +0000 | [diff] [blame] | 1653 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1654 | } |
Thomas Graf | a14a49d | 2006-08-07 17:53:08 -0700 | [diff] [blame] | 1655 | |
| 1656 | err = neigh_update(neigh, NULL, NUD_FAILED, |
| 1657 | NEIGH_UPDATE_F_OVERRIDE | |
| 1658 | NEIGH_UPDATE_F_ADMIN); |
| 1659 | neigh_release(neigh); |
Eric Dumazet | 110b249 | 2010-10-04 04:27:36 +0000 | [diff] [blame] | 1660 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1661 | } |
| 1662 | read_unlock(&neigh_tbl_lock); |
Thomas Graf | a14a49d | 2006-08-07 17:53:08 -0700 | [diff] [blame] | 1663 | err = -EAFNOSUPPORT; |
| 1664 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1665 | out: |
| 1666 | return err; |
| 1667 | } |
| 1668 | |
Thomas Graf | 661d296 | 2013-03-21 07:45:29 +0000 | [diff] [blame] | 1669 | static int neigh_add(struct sk_buff *skb, struct nlmsghdr *nlh) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1670 | { |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1671 | struct net *net = sock_net(skb->sk); |
Thomas Graf | 5208deb | 2006-08-07 17:55:40 -0700 | [diff] [blame] | 1672 | struct ndmsg *ndm; |
| 1673 | struct nlattr *tb[NDA_MAX+1]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1674 | struct neigh_table *tbl; |
| 1675 | struct net_device *dev = NULL; |
Thomas Graf | 5208deb | 2006-08-07 17:55:40 -0700 | [diff] [blame] | 1676 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1677 | |
Eric Dumazet | 110b249 | 2010-10-04 04:27:36 +0000 | [diff] [blame] | 1678 | ASSERT_RTNL(); |
Thomas Graf | 5208deb | 2006-08-07 17:55:40 -0700 | [diff] [blame] | 1679 | err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL); |
| 1680 | if (err < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1681 | goto out; |
| 1682 | |
Thomas Graf | 5208deb | 2006-08-07 17:55:40 -0700 | [diff] [blame] | 1683 | err = -EINVAL; |
| 1684 | if (tb[NDA_DST] == NULL) |
| 1685 | goto out; |
| 1686 | |
| 1687 | ndm = nlmsg_data(nlh); |
| 1688 | if (ndm->ndm_ifindex) { |
Eric Dumazet | 110b249 | 2010-10-04 04:27:36 +0000 | [diff] [blame] | 1689 | dev = __dev_get_by_index(net, ndm->ndm_ifindex); |
Thomas Graf | 5208deb | 2006-08-07 17:55:40 -0700 | [diff] [blame] | 1690 | if (dev == NULL) { |
| 1691 | err = -ENODEV; |
| 1692 | goto out; |
| 1693 | } |
| 1694 | |
| 1695 | if (tb[NDA_LLADDR] && nla_len(tb[NDA_LLADDR]) < dev->addr_len) |
Eric Dumazet | 110b249 | 2010-10-04 04:27:36 +0000 | [diff] [blame] | 1696 | goto out; |
Thomas Graf | 5208deb | 2006-08-07 17:55:40 -0700 | [diff] [blame] | 1697 | } |
| 1698 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1699 | read_lock(&neigh_tbl_lock); |
| 1700 | for (tbl = neigh_tables; tbl; tbl = tbl->next) { |
Thomas Graf | 5208deb | 2006-08-07 17:55:40 -0700 | [diff] [blame] | 1701 | int flags = NEIGH_UPDATE_F_ADMIN | NEIGH_UPDATE_F_OVERRIDE; |
| 1702 | struct neighbour *neigh; |
| 1703 | void *dst, *lladdr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1704 | |
| 1705 | if (tbl->family != ndm->ndm_family) |
| 1706 | continue; |
| 1707 | read_unlock(&neigh_tbl_lock); |
| 1708 | |
Thomas Graf | 5208deb | 2006-08-07 17:55:40 -0700 | [diff] [blame] | 1709 | if (nla_len(tb[NDA_DST]) < tbl->key_len) |
Eric Dumazet | 110b249 | 2010-10-04 04:27:36 +0000 | [diff] [blame] | 1710 | goto out; |
Thomas Graf | 5208deb | 2006-08-07 17:55:40 -0700 | [diff] [blame] | 1711 | dst = nla_data(tb[NDA_DST]); |
| 1712 | lladdr = tb[NDA_LLADDR] ? nla_data(tb[NDA_LLADDR]) : NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1713 | |
| 1714 | if (ndm->ndm_flags & NTF_PROXY) { |
Ville Nuorvala | 62dd931 | 2006-09-22 14:43:19 -0700 | [diff] [blame] | 1715 | struct pneigh_entry *pn; |
| 1716 | |
| 1717 | err = -ENOBUFS; |
Eric W. Biederman | 426b530 | 2008-01-24 00:13:18 -0800 | [diff] [blame] | 1718 | pn = pneigh_lookup(tbl, net, dst, dev, 1); |
Ville Nuorvala | 62dd931 | 2006-09-22 14:43:19 -0700 | [diff] [blame] | 1719 | if (pn) { |
| 1720 | pn->flags = ndm->ndm_flags; |
| 1721 | err = 0; |
| 1722 | } |
Eric Dumazet | 110b249 | 2010-10-04 04:27:36 +0000 | [diff] [blame] | 1723 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1724 | } |
| 1725 | |
Thomas Graf | 5208deb | 2006-08-07 17:55:40 -0700 | [diff] [blame] | 1726 | if (dev == NULL) |
Eric Dumazet | 110b249 | 2010-10-04 04:27:36 +0000 | [diff] [blame] | 1727 | goto out; |
Thomas Graf | 5208deb | 2006-08-07 17:55:40 -0700 | [diff] [blame] | 1728 | |
| 1729 | neigh = neigh_lookup(tbl, dst, dev); |
| 1730 | if (neigh == NULL) { |
| 1731 | if (!(nlh->nlmsg_flags & NLM_F_CREATE)) { |
| 1732 | err = -ENOENT; |
Eric Dumazet | 110b249 | 2010-10-04 04:27:36 +0000 | [diff] [blame] | 1733 | goto out; |
Thomas Graf | 5208deb | 2006-08-07 17:55:40 -0700 | [diff] [blame] | 1734 | } |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1735 | |
Thomas Graf | 5208deb | 2006-08-07 17:55:40 -0700 | [diff] [blame] | 1736 | neigh = __neigh_lookup_errno(tbl, dst, dev); |
| 1737 | if (IS_ERR(neigh)) { |
| 1738 | err = PTR_ERR(neigh); |
Eric Dumazet | 110b249 | 2010-10-04 04:27:36 +0000 | [diff] [blame] | 1739 | goto out; |
Thomas Graf | 5208deb | 2006-08-07 17:55:40 -0700 | [diff] [blame] | 1740 | } |
| 1741 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1742 | if (nlh->nlmsg_flags & NLM_F_EXCL) { |
| 1743 | err = -EEXIST; |
Thomas Graf | 5208deb | 2006-08-07 17:55:40 -0700 | [diff] [blame] | 1744 | neigh_release(neigh); |
Eric Dumazet | 110b249 | 2010-10-04 04:27:36 +0000 | [diff] [blame] | 1745 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1746 | } |
Thomas Graf | 5208deb | 2006-08-07 17:55:40 -0700 | [diff] [blame] | 1747 | |
| 1748 | if (!(nlh->nlmsg_flags & NLM_F_REPLACE)) |
| 1749 | flags &= ~NEIGH_UPDATE_F_OVERRIDE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1750 | } |
| 1751 | |
Eric Biederman | 0c5c2d3 | 2009-03-04 00:03:08 -0800 | [diff] [blame] | 1752 | if (ndm->ndm_flags & NTF_USE) { |
| 1753 | neigh_event_send(neigh, NULL); |
| 1754 | err = 0; |
| 1755 | } else |
| 1756 | err = neigh_update(neigh, lladdr, ndm->ndm_state, flags); |
Thomas Graf | 5208deb | 2006-08-07 17:55:40 -0700 | [diff] [blame] | 1757 | neigh_release(neigh); |
Eric Dumazet | 110b249 | 2010-10-04 04:27:36 +0000 | [diff] [blame] | 1758 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1759 | } |
| 1760 | |
| 1761 | read_unlock(&neigh_tbl_lock); |
Thomas Graf | 5208deb | 2006-08-07 17:55:40 -0700 | [diff] [blame] | 1762 | err = -EAFNOSUPPORT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1763 | out: |
| 1764 | return err; |
| 1765 | } |
| 1766 | |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1767 | static int neightbl_fill_parms(struct sk_buff *skb, struct neigh_parms *parms) |
| 1768 | { |
Thomas Graf | ca860fb | 2006-08-07 18:00:18 -0700 | [diff] [blame] | 1769 | struct nlattr *nest; |
| 1770 | |
| 1771 | nest = nla_nest_start(skb, NDTA_PARMS); |
| 1772 | if (nest == NULL) |
| 1773 | return -ENOBUFS; |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1774 | |
David S. Miller | 9a6308d | 2012-04-01 20:06:28 -0400 | [diff] [blame] | 1775 | if ((parms->dev && |
| 1776 | nla_put_u32(skb, NDTPA_IFINDEX, parms->dev->ifindex)) || |
| 1777 | nla_put_u32(skb, NDTPA_REFCNT, atomic_read(&parms->refcnt)) || |
| 1778 | nla_put_u32(skb, NDTPA_QUEUE_LENBYTES, parms->queue_len_bytes) || |
| 1779 | /* approximative value for deprecated QUEUE_LEN (in packets) */ |
| 1780 | nla_put_u32(skb, NDTPA_QUEUE_LEN, |
Shan Wei | ce46cc6 | 2012-12-04 18:49:15 +0000 | [diff] [blame] | 1781 | parms->queue_len_bytes / SKB_TRUESIZE(ETH_FRAME_LEN)) || |
David S. Miller | 9a6308d | 2012-04-01 20:06:28 -0400 | [diff] [blame] | 1782 | nla_put_u32(skb, NDTPA_PROXY_QLEN, parms->proxy_qlen) || |
| 1783 | nla_put_u32(skb, NDTPA_APP_PROBES, parms->app_probes) || |
| 1784 | nla_put_u32(skb, NDTPA_UCAST_PROBES, parms->ucast_probes) || |
| 1785 | nla_put_u32(skb, NDTPA_MCAST_PROBES, parms->mcast_probes) || |
| 1786 | nla_put_msecs(skb, NDTPA_REACHABLE_TIME, parms->reachable_time) || |
| 1787 | nla_put_msecs(skb, NDTPA_BASE_REACHABLE_TIME, |
| 1788 | parms->base_reachable_time) || |
| 1789 | nla_put_msecs(skb, NDTPA_GC_STALETIME, parms->gc_staletime) || |
| 1790 | nla_put_msecs(skb, NDTPA_DELAY_PROBE_TIME, |
| 1791 | parms->delay_probe_time) || |
| 1792 | nla_put_msecs(skb, NDTPA_RETRANS_TIME, parms->retrans_time) || |
| 1793 | nla_put_msecs(skb, NDTPA_ANYCAST_DELAY, parms->anycast_delay) || |
| 1794 | nla_put_msecs(skb, NDTPA_PROXY_DELAY, parms->proxy_delay) || |
| 1795 | nla_put_msecs(skb, NDTPA_LOCKTIME, parms->locktime)) |
| 1796 | goto nla_put_failure; |
Thomas Graf | ca860fb | 2006-08-07 18:00:18 -0700 | [diff] [blame] | 1797 | return nla_nest_end(skb, nest); |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1798 | |
Thomas Graf | ca860fb | 2006-08-07 18:00:18 -0700 | [diff] [blame] | 1799 | nla_put_failure: |
Thomas Graf | bc3ed28 | 2008-06-03 16:36:54 -0700 | [diff] [blame] | 1800 | nla_nest_cancel(skb, nest); |
| 1801 | return -EMSGSIZE; |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1802 | } |
| 1803 | |
Thomas Graf | ca860fb | 2006-08-07 18:00:18 -0700 | [diff] [blame] | 1804 | static int neightbl_fill_info(struct sk_buff *skb, struct neigh_table *tbl, |
| 1805 | u32 pid, u32 seq, int type, int flags) |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1806 | { |
| 1807 | struct nlmsghdr *nlh; |
| 1808 | struct ndtmsg *ndtmsg; |
| 1809 | |
Thomas Graf | ca860fb | 2006-08-07 18:00:18 -0700 | [diff] [blame] | 1810 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndtmsg), flags); |
| 1811 | if (nlh == NULL) |
Patrick McHardy | 2693256 | 2007-01-31 23:16:40 -0800 | [diff] [blame] | 1812 | return -EMSGSIZE; |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1813 | |
Thomas Graf | ca860fb | 2006-08-07 18:00:18 -0700 | [diff] [blame] | 1814 | ndtmsg = nlmsg_data(nlh); |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1815 | |
| 1816 | read_lock_bh(&tbl->lock); |
| 1817 | ndtmsg->ndtm_family = tbl->family; |
Patrick McHardy | 9ef1d4c | 2005-06-28 12:55:30 -0700 | [diff] [blame] | 1818 | ndtmsg->ndtm_pad1 = 0; |
| 1819 | ndtmsg->ndtm_pad2 = 0; |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1820 | |
David S. Miller | 9a6308d | 2012-04-01 20:06:28 -0400 | [diff] [blame] | 1821 | if (nla_put_string(skb, NDTA_NAME, tbl->id) || |
| 1822 | nla_put_msecs(skb, NDTA_GC_INTERVAL, tbl->gc_interval) || |
| 1823 | nla_put_u32(skb, NDTA_THRESH1, tbl->gc_thresh1) || |
| 1824 | nla_put_u32(skb, NDTA_THRESH2, tbl->gc_thresh2) || |
| 1825 | nla_put_u32(skb, NDTA_THRESH3, tbl->gc_thresh3)) |
| 1826 | goto nla_put_failure; |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1827 | { |
| 1828 | unsigned long now = jiffies; |
| 1829 | unsigned int flush_delta = now - tbl->last_flush; |
| 1830 | unsigned int rand_delta = now - tbl->last_rand; |
Eric Dumazet | d6bf781 | 2010-10-04 06:15:44 +0000 | [diff] [blame] | 1831 | struct neigh_hash_table *nht; |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1832 | struct ndt_config ndc = { |
| 1833 | .ndtc_key_len = tbl->key_len, |
| 1834 | .ndtc_entry_size = tbl->entry_size, |
| 1835 | .ndtc_entries = atomic_read(&tbl->entries), |
| 1836 | .ndtc_last_flush = jiffies_to_msecs(flush_delta), |
| 1837 | .ndtc_last_rand = jiffies_to_msecs(rand_delta), |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1838 | .ndtc_proxy_qlen = tbl->proxy_queue.qlen, |
| 1839 | }; |
| 1840 | |
Eric Dumazet | d6bf781 | 2010-10-04 06:15:44 +0000 | [diff] [blame] | 1841 | rcu_read_lock_bh(); |
| 1842 | nht = rcu_dereference_bh(tbl->nht); |
David S. Miller | 2c2aba6 | 2011-12-28 15:06:58 -0500 | [diff] [blame] | 1843 | ndc.ndtc_hash_rnd = nht->hash_rnd[0]; |
David S. Miller | cd08933 | 2011-07-11 01:28:12 -0700 | [diff] [blame] | 1844 | ndc.ndtc_hash_mask = ((1 << nht->hash_shift) - 1); |
Eric Dumazet | d6bf781 | 2010-10-04 06:15:44 +0000 | [diff] [blame] | 1845 | rcu_read_unlock_bh(); |
| 1846 | |
David S. Miller | 9a6308d | 2012-04-01 20:06:28 -0400 | [diff] [blame] | 1847 | if (nla_put(skb, NDTA_CONFIG, sizeof(ndc), &ndc)) |
| 1848 | goto nla_put_failure; |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1849 | } |
| 1850 | |
| 1851 | { |
| 1852 | int cpu; |
| 1853 | struct ndt_stats ndst; |
| 1854 | |
| 1855 | memset(&ndst, 0, sizeof(ndst)); |
| 1856 | |
KAMEZAWA Hiroyuki | 6f91204 | 2006-04-10 22:52:50 -0700 | [diff] [blame] | 1857 | for_each_possible_cpu(cpu) { |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1858 | struct neigh_statistics *st; |
| 1859 | |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1860 | st = per_cpu_ptr(tbl->stats, cpu); |
| 1861 | ndst.ndts_allocs += st->allocs; |
| 1862 | ndst.ndts_destroys += st->destroys; |
| 1863 | ndst.ndts_hash_grows += st->hash_grows; |
| 1864 | ndst.ndts_res_failed += st->res_failed; |
| 1865 | ndst.ndts_lookups += st->lookups; |
| 1866 | ndst.ndts_hits += st->hits; |
| 1867 | ndst.ndts_rcv_probes_mcast += st->rcv_probes_mcast; |
| 1868 | ndst.ndts_rcv_probes_ucast += st->rcv_probes_ucast; |
| 1869 | ndst.ndts_periodic_gc_runs += st->periodic_gc_runs; |
| 1870 | ndst.ndts_forced_gc_runs += st->forced_gc_runs; |
| 1871 | } |
| 1872 | |
David S. Miller | 9a6308d | 2012-04-01 20:06:28 -0400 | [diff] [blame] | 1873 | if (nla_put(skb, NDTA_STATS, sizeof(ndst), &ndst)) |
| 1874 | goto nla_put_failure; |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1875 | } |
| 1876 | |
| 1877 | BUG_ON(tbl->parms.dev); |
| 1878 | if (neightbl_fill_parms(skb, &tbl->parms) < 0) |
Thomas Graf | ca860fb | 2006-08-07 18:00:18 -0700 | [diff] [blame] | 1879 | goto nla_put_failure; |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1880 | |
| 1881 | read_unlock_bh(&tbl->lock); |
Thomas Graf | ca860fb | 2006-08-07 18:00:18 -0700 | [diff] [blame] | 1882 | return nlmsg_end(skb, nlh); |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1883 | |
Thomas Graf | ca860fb | 2006-08-07 18:00:18 -0700 | [diff] [blame] | 1884 | nla_put_failure: |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1885 | read_unlock_bh(&tbl->lock); |
Patrick McHardy | 2693256 | 2007-01-31 23:16:40 -0800 | [diff] [blame] | 1886 | nlmsg_cancel(skb, nlh); |
| 1887 | return -EMSGSIZE; |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1888 | } |
| 1889 | |
Thomas Graf | ca860fb | 2006-08-07 18:00:18 -0700 | [diff] [blame] | 1890 | static int neightbl_fill_param_info(struct sk_buff *skb, |
| 1891 | struct neigh_table *tbl, |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1892 | struct neigh_parms *parms, |
Thomas Graf | ca860fb | 2006-08-07 18:00:18 -0700 | [diff] [blame] | 1893 | u32 pid, u32 seq, int type, |
| 1894 | unsigned int flags) |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1895 | { |
| 1896 | struct ndtmsg *ndtmsg; |
| 1897 | struct nlmsghdr *nlh; |
| 1898 | |
Thomas Graf | ca860fb | 2006-08-07 18:00:18 -0700 | [diff] [blame] | 1899 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndtmsg), flags); |
| 1900 | if (nlh == NULL) |
Patrick McHardy | 2693256 | 2007-01-31 23:16:40 -0800 | [diff] [blame] | 1901 | return -EMSGSIZE; |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1902 | |
Thomas Graf | ca860fb | 2006-08-07 18:00:18 -0700 | [diff] [blame] | 1903 | ndtmsg = nlmsg_data(nlh); |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1904 | |
| 1905 | read_lock_bh(&tbl->lock); |
| 1906 | ndtmsg->ndtm_family = tbl->family; |
Patrick McHardy | 9ef1d4c | 2005-06-28 12:55:30 -0700 | [diff] [blame] | 1907 | ndtmsg->ndtm_pad1 = 0; |
| 1908 | ndtmsg->ndtm_pad2 = 0; |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1909 | |
Thomas Graf | ca860fb | 2006-08-07 18:00:18 -0700 | [diff] [blame] | 1910 | if (nla_put_string(skb, NDTA_NAME, tbl->id) < 0 || |
| 1911 | neightbl_fill_parms(skb, parms) < 0) |
| 1912 | goto errout; |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1913 | |
| 1914 | read_unlock_bh(&tbl->lock); |
Thomas Graf | ca860fb | 2006-08-07 18:00:18 -0700 | [diff] [blame] | 1915 | return nlmsg_end(skb, nlh); |
| 1916 | errout: |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1917 | read_unlock_bh(&tbl->lock); |
Patrick McHardy | 2693256 | 2007-01-31 23:16:40 -0800 | [diff] [blame] | 1918 | nlmsg_cancel(skb, nlh); |
| 1919 | return -EMSGSIZE; |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1920 | } |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1921 | |
Patrick McHardy | ef7c79e | 2007-06-05 12:38:30 -0700 | [diff] [blame] | 1922 | static const struct nla_policy nl_neightbl_policy[NDTA_MAX+1] = { |
Thomas Graf | 6b3f867 | 2006-08-07 17:58:53 -0700 | [diff] [blame] | 1923 | [NDTA_NAME] = { .type = NLA_STRING }, |
| 1924 | [NDTA_THRESH1] = { .type = NLA_U32 }, |
| 1925 | [NDTA_THRESH2] = { .type = NLA_U32 }, |
| 1926 | [NDTA_THRESH3] = { .type = NLA_U32 }, |
| 1927 | [NDTA_GC_INTERVAL] = { .type = NLA_U64 }, |
| 1928 | [NDTA_PARMS] = { .type = NLA_NESTED }, |
| 1929 | }; |
| 1930 | |
Patrick McHardy | ef7c79e | 2007-06-05 12:38:30 -0700 | [diff] [blame] | 1931 | static const struct nla_policy nl_ntbl_parm_policy[NDTPA_MAX+1] = { |
Thomas Graf | 6b3f867 | 2006-08-07 17:58:53 -0700 | [diff] [blame] | 1932 | [NDTPA_IFINDEX] = { .type = NLA_U32 }, |
| 1933 | [NDTPA_QUEUE_LEN] = { .type = NLA_U32 }, |
| 1934 | [NDTPA_PROXY_QLEN] = { .type = NLA_U32 }, |
| 1935 | [NDTPA_APP_PROBES] = { .type = NLA_U32 }, |
| 1936 | [NDTPA_UCAST_PROBES] = { .type = NLA_U32 }, |
| 1937 | [NDTPA_MCAST_PROBES] = { .type = NLA_U32 }, |
| 1938 | [NDTPA_BASE_REACHABLE_TIME] = { .type = NLA_U64 }, |
| 1939 | [NDTPA_GC_STALETIME] = { .type = NLA_U64 }, |
| 1940 | [NDTPA_DELAY_PROBE_TIME] = { .type = NLA_U64 }, |
| 1941 | [NDTPA_RETRANS_TIME] = { .type = NLA_U64 }, |
| 1942 | [NDTPA_ANYCAST_DELAY] = { .type = NLA_U64 }, |
| 1943 | [NDTPA_PROXY_DELAY] = { .type = NLA_U64 }, |
| 1944 | [NDTPA_LOCKTIME] = { .type = NLA_U64 }, |
| 1945 | }; |
| 1946 | |
Thomas Graf | 661d296 | 2013-03-21 07:45:29 +0000 | [diff] [blame] | 1947 | static int neightbl_set(struct sk_buff *skb, struct nlmsghdr *nlh) |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1948 | { |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1949 | struct net *net = sock_net(skb->sk); |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1950 | struct neigh_table *tbl; |
Thomas Graf | 6b3f867 | 2006-08-07 17:58:53 -0700 | [diff] [blame] | 1951 | struct ndtmsg *ndtmsg; |
| 1952 | struct nlattr *tb[NDTA_MAX+1]; |
| 1953 | int err; |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1954 | |
Thomas Graf | 6b3f867 | 2006-08-07 17:58:53 -0700 | [diff] [blame] | 1955 | err = nlmsg_parse(nlh, sizeof(*ndtmsg), tb, NDTA_MAX, |
| 1956 | nl_neightbl_policy); |
| 1957 | if (err < 0) |
| 1958 | goto errout; |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1959 | |
Thomas Graf | 6b3f867 | 2006-08-07 17:58:53 -0700 | [diff] [blame] | 1960 | if (tb[NDTA_NAME] == NULL) { |
| 1961 | err = -EINVAL; |
| 1962 | goto errout; |
| 1963 | } |
| 1964 | |
| 1965 | ndtmsg = nlmsg_data(nlh); |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1966 | read_lock(&neigh_tbl_lock); |
| 1967 | for (tbl = neigh_tables; tbl; tbl = tbl->next) { |
| 1968 | if (ndtmsg->ndtm_family && tbl->family != ndtmsg->ndtm_family) |
| 1969 | continue; |
| 1970 | |
Thomas Graf | 6b3f867 | 2006-08-07 17:58:53 -0700 | [diff] [blame] | 1971 | if (nla_strcmp(tb[NDTA_NAME], tbl->id) == 0) |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1972 | break; |
| 1973 | } |
| 1974 | |
| 1975 | if (tbl == NULL) { |
| 1976 | err = -ENOENT; |
Thomas Graf | 6b3f867 | 2006-08-07 17:58:53 -0700 | [diff] [blame] | 1977 | goto errout_locked; |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1978 | } |
| 1979 | |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1980 | /* |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1981 | * We acquire tbl->lock to be nice to the periodic timers and |
| 1982 | * make sure they always see a consistent set of values. |
| 1983 | */ |
| 1984 | write_lock_bh(&tbl->lock); |
| 1985 | |
Thomas Graf | 6b3f867 | 2006-08-07 17:58:53 -0700 | [diff] [blame] | 1986 | if (tb[NDTA_PARMS]) { |
| 1987 | struct nlattr *tbp[NDTPA_MAX+1]; |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1988 | struct neigh_parms *p; |
Thomas Graf | 6b3f867 | 2006-08-07 17:58:53 -0700 | [diff] [blame] | 1989 | int i, ifindex = 0; |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1990 | |
Thomas Graf | 6b3f867 | 2006-08-07 17:58:53 -0700 | [diff] [blame] | 1991 | err = nla_parse_nested(tbp, NDTPA_MAX, tb[NDTA_PARMS], |
| 1992 | nl_ntbl_parm_policy); |
| 1993 | if (err < 0) |
| 1994 | goto errout_tbl_lock; |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1995 | |
Thomas Graf | 6b3f867 | 2006-08-07 17:58:53 -0700 | [diff] [blame] | 1996 | if (tbp[NDTPA_IFINDEX]) |
| 1997 | ifindex = nla_get_u32(tbp[NDTPA_IFINDEX]); |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1998 | |
Tobias Klauser | 97fd5bc | 2009-07-13 11:17:49 -0700 | [diff] [blame] | 1999 | p = lookup_neigh_parms(tbl, net, ifindex); |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 2000 | if (p == NULL) { |
| 2001 | err = -ENOENT; |
Thomas Graf | 6b3f867 | 2006-08-07 17:58:53 -0700 | [diff] [blame] | 2002 | goto errout_tbl_lock; |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 2003 | } |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 2004 | |
Thomas Graf | 6b3f867 | 2006-08-07 17:58:53 -0700 | [diff] [blame] | 2005 | for (i = 1; i <= NDTPA_MAX; i++) { |
| 2006 | if (tbp[i] == NULL) |
| 2007 | continue; |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 2008 | |
Thomas Graf | 6b3f867 | 2006-08-07 17:58:53 -0700 | [diff] [blame] | 2009 | switch (i) { |
| 2010 | case NDTPA_QUEUE_LEN: |
Eric Dumazet | 8b5c171 | 2011-11-09 12:07:14 +0000 | [diff] [blame] | 2011 | p->queue_len_bytes = nla_get_u32(tbp[i]) * |
| 2012 | SKB_TRUESIZE(ETH_FRAME_LEN); |
| 2013 | break; |
| 2014 | case NDTPA_QUEUE_LENBYTES: |
| 2015 | p->queue_len_bytes = nla_get_u32(tbp[i]); |
Thomas Graf | 6b3f867 | 2006-08-07 17:58:53 -0700 | [diff] [blame] | 2016 | break; |
| 2017 | case NDTPA_PROXY_QLEN: |
| 2018 | p->proxy_qlen = nla_get_u32(tbp[i]); |
| 2019 | break; |
| 2020 | case NDTPA_APP_PROBES: |
| 2021 | p->app_probes = nla_get_u32(tbp[i]); |
| 2022 | break; |
| 2023 | case NDTPA_UCAST_PROBES: |
| 2024 | p->ucast_probes = nla_get_u32(tbp[i]); |
| 2025 | break; |
| 2026 | case NDTPA_MCAST_PROBES: |
| 2027 | p->mcast_probes = nla_get_u32(tbp[i]); |
| 2028 | break; |
| 2029 | case NDTPA_BASE_REACHABLE_TIME: |
| 2030 | p->base_reachable_time = nla_get_msecs(tbp[i]); |
| 2031 | break; |
| 2032 | case NDTPA_GC_STALETIME: |
| 2033 | p->gc_staletime = nla_get_msecs(tbp[i]); |
| 2034 | break; |
| 2035 | case NDTPA_DELAY_PROBE_TIME: |
| 2036 | p->delay_probe_time = nla_get_msecs(tbp[i]); |
| 2037 | break; |
| 2038 | case NDTPA_RETRANS_TIME: |
| 2039 | p->retrans_time = nla_get_msecs(tbp[i]); |
| 2040 | break; |
| 2041 | case NDTPA_ANYCAST_DELAY: |
| 2042 | p->anycast_delay = nla_get_msecs(tbp[i]); |
| 2043 | break; |
| 2044 | case NDTPA_PROXY_DELAY: |
| 2045 | p->proxy_delay = nla_get_msecs(tbp[i]); |
| 2046 | break; |
| 2047 | case NDTPA_LOCKTIME: |
| 2048 | p->locktime = nla_get_msecs(tbp[i]); |
| 2049 | break; |
| 2050 | } |
| 2051 | } |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 2052 | } |
| 2053 | |
Gao feng | dc25c67 | 2013-06-20 10:01:34 +0800 | [diff] [blame] | 2054 | err = -ENOENT; |
| 2055 | if ((tb[NDTA_THRESH1] || tb[NDTA_THRESH2] || |
| 2056 | tb[NDTA_THRESH3] || tb[NDTA_GC_INTERVAL]) && |
| 2057 | !net_eq(net, &init_net)) |
| 2058 | goto errout_tbl_lock; |
| 2059 | |
Thomas Graf | 6b3f867 | 2006-08-07 17:58:53 -0700 | [diff] [blame] | 2060 | if (tb[NDTA_THRESH1]) |
| 2061 | tbl->gc_thresh1 = nla_get_u32(tb[NDTA_THRESH1]); |
| 2062 | |
| 2063 | if (tb[NDTA_THRESH2]) |
| 2064 | tbl->gc_thresh2 = nla_get_u32(tb[NDTA_THRESH2]); |
| 2065 | |
| 2066 | if (tb[NDTA_THRESH3]) |
| 2067 | tbl->gc_thresh3 = nla_get_u32(tb[NDTA_THRESH3]); |
| 2068 | |
| 2069 | if (tb[NDTA_GC_INTERVAL]) |
| 2070 | tbl->gc_interval = nla_get_msecs(tb[NDTA_GC_INTERVAL]); |
| 2071 | |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 2072 | err = 0; |
| 2073 | |
Thomas Graf | 6b3f867 | 2006-08-07 17:58:53 -0700 | [diff] [blame] | 2074 | errout_tbl_lock: |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 2075 | write_unlock_bh(&tbl->lock); |
Thomas Graf | 6b3f867 | 2006-08-07 17:58:53 -0700 | [diff] [blame] | 2076 | errout_locked: |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 2077 | read_unlock(&neigh_tbl_lock); |
Thomas Graf | 6b3f867 | 2006-08-07 17:58:53 -0700 | [diff] [blame] | 2078 | errout: |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 2079 | return err; |
| 2080 | } |
| 2081 | |
Thomas Graf | c8822a4 | 2007-03-22 11:50:06 -0700 | [diff] [blame] | 2082 | 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] | 2083 | { |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 2084 | struct net *net = sock_net(skb->sk); |
Thomas Graf | ca860fb | 2006-08-07 18:00:18 -0700 | [diff] [blame] | 2085 | int family, tidx, nidx = 0; |
| 2086 | int tbl_skip = cb->args[0]; |
| 2087 | int neigh_skip = cb->args[1]; |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 2088 | struct neigh_table *tbl; |
| 2089 | |
Thomas Graf | ca860fb | 2006-08-07 18:00:18 -0700 | [diff] [blame] | 2090 | family = ((struct rtgenmsg *) nlmsg_data(cb->nlh))->rtgen_family; |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 2091 | |
| 2092 | read_lock(&neigh_tbl_lock); |
Thomas Graf | ca860fb | 2006-08-07 18:00:18 -0700 | [diff] [blame] | 2093 | for (tbl = neigh_tables, tidx = 0; tbl; tbl = tbl->next, tidx++) { |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 2094 | struct neigh_parms *p; |
| 2095 | |
Thomas Graf | ca860fb | 2006-08-07 18:00:18 -0700 | [diff] [blame] | 2096 | if (tidx < tbl_skip || (family && tbl->family != family)) |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 2097 | continue; |
| 2098 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2099 | if (neightbl_fill_info(skb, tbl, NETLINK_CB(cb->skb).portid, |
Thomas Graf | ca860fb | 2006-08-07 18:00:18 -0700 | [diff] [blame] | 2100 | cb->nlh->nlmsg_seq, RTM_NEWNEIGHTBL, |
| 2101 | NLM_F_MULTI) <= 0) |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 2102 | break; |
| 2103 | |
Eric W. Biederman | 426b530 | 2008-01-24 00:13:18 -0800 | [diff] [blame] | 2104 | for (nidx = 0, p = tbl->parms.next; p; p = p->next) { |
YOSHIFUJI Hideaki | 878628f | 2008-03-26 03:57:35 +0900 | [diff] [blame] | 2105 | if (!net_eq(neigh_parms_net(p), net)) |
Eric W. Biederman | 426b530 | 2008-01-24 00:13:18 -0800 | [diff] [blame] | 2106 | continue; |
| 2107 | |
Gautam Kachroo | efc683f | 2009-02-06 00:52:04 -0800 | [diff] [blame] | 2108 | if (nidx < neigh_skip) |
| 2109 | goto next; |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 2110 | |
Thomas Graf | ca860fb | 2006-08-07 18:00:18 -0700 | [diff] [blame] | 2111 | if (neightbl_fill_param_info(skb, tbl, p, |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2112 | NETLINK_CB(cb->skb).portid, |
Thomas Graf | ca860fb | 2006-08-07 18:00:18 -0700 | [diff] [blame] | 2113 | cb->nlh->nlmsg_seq, |
| 2114 | RTM_NEWNEIGHTBL, |
| 2115 | NLM_F_MULTI) <= 0) |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 2116 | goto out; |
Gautam Kachroo | efc683f | 2009-02-06 00:52:04 -0800 | [diff] [blame] | 2117 | next: |
| 2118 | nidx++; |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 2119 | } |
| 2120 | |
Thomas Graf | ca860fb | 2006-08-07 18:00:18 -0700 | [diff] [blame] | 2121 | neigh_skip = 0; |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 2122 | } |
| 2123 | out: |
| 2124 | read_unlock(&neigh_tbl_lock); |
Thomas Graf | ca860fb | 2006-08-07 18:00:18 -0700 | [diff] [blame] | 2125 | cb->args[0] = tidx; |
| 2126 | cb->args[1] = nidx; |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 2127 | |
| 2128 | return skb->len; |
| 2129 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2130 | |
Thomas Graf | 8b8aec5 | 2006-08-07 17:56:37 -0700 | [diff] [blame] | 2131 | static int neigh_fill_info(struct sk_buff *skb, struct neighbour *neigh, |
| 2132 | u32 pid, u32 seq, int type, unsigned int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2133 | { |
| 2134 | unsigned long now = jiffies; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2135 | struct nda_cacheinfo ci; |
Thomas Graf | 8b8aec5 | 2006-08-07 17:56:37 -0700 | [diff] [blame] | 2136 | struct nlmsghdr *nlh; |
| 2137 | struct ndmsg *ndm; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2138 | |
Thomas Graf | 8b8aec5 | 2006-08-07 17:56:37 -0700 | [diff] [blame] | 2139 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), flags); |
| 2140 | if (nlh == NULL) |
Patrick McHardy | 2693256 | 2007-01-31 23:16:40 -0800 | [diff] [blame] | 2141 | return -EMSGSIZE; |
Thomas Graf | 8b8aec5 | 2006-08-07 17:56:37 -0700 | [diff] [blame] | 2142 | |
| 2143 | ndm = nlmsg_data(nlh); |
| 2144 | ndm->ndm_family = neigh->ops->family; |
Patrick McHardy | 9ef1d4c | 2005-06-28 12:55:30 -0700 | [diff] [blame] | 2145 | ndm->ndm_pad1 = 0; |
| 2146 | ndm->ndm_pad2 = 0; |
Thomas Graf | 8b8aec5 | 2006-08-07 17:56:37 -0700 | [diff] [blame] | 2147 | ndm->ndm_flags = neigh->flags; |
| 2148 | ndm->ndm_type = neigh->type; |
| 2149 | ndm->ndm_ifindex = neigh->dev->ifindex; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2150 | |
David S. Miller | 9a6308d | 2012-04-01 20:06:28 -0400 | [diff] [blame] | 2151 | if (nla_put(skb, NDA_DST, neigh->tbl->key_len, neigh->primary_key)) |
| 2152 | goto nla_put_failure; |
Thomas Graf | 8b8aec5 | 2006-08-07 17:56:37 -0700 | [diff] [blame] | 2153 | |
| 2154 | read_lock_bh(&neigh->lock); |
| 2155 | ndm->ndm_state = neigh->nud_state; |
Eric Dumazet | 0ed8ddf | 2010-10-07 10:44:07 +0000 | [diff] [blame] | 2156 | if (neigh->nud_state & NUD_VALID) { |
| 2157 | char haddr[MAX_ADDR_LEN]; |
| 2158 | |
| 2159 | neigh_ha_snapshot(haddr, neigh, neigh->dev); |
| 2160 | if (nla_put(skb, NDA_LLADDR, neigh->dev->addr_len, haddr) < 0) { |
| 2161 | read_unlock_bh(&neigh->lock); |
| 2162 | goto nla_put_failure; |
| 2163 | } |
Thomas Graf | 8b8aec5 | 2006-08-07 17:56:37 -0700 | [diff] [blame] | 2164 | } |
| 2165 | |
Stephen Hemminger | b9f5f52 | 2008-06-03 16:03:15 -0700 | [diff] [blame] | 2166 | ci.ndm_used = jiffies_to_clock_t(now - neigh->used); |
| 2167 | ci.ndm_confirmed = jiffies_to_clock_t(now - neigh->confirmed); |
| 2168 | ci.ndm_updated = jiffies_to_clock_t(now - neigh->updated); |
Thomas Graf | 8b8aec5 | 2006-08-07 17:56:37 -0700 | [diff] [blame] | 2169 | ci.ndm_refcnt = atomic_read(&neigh->refcnt) - 1; |
| 2170 | read_unlock_bh(&neigh->lock); |
| 2171 | |
David S. Miller | 9a6308d | 2012-04-01 20:06:28 -0400 | [diff] [blame] | 2172 | if (nla_put_u32(skb, NDA_PROBES, atomic_read(&neigh->probes)) || |
| 2173 | nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci)) |
| 2174 | goto nla_put_failure; |
Thomas Graf | 8b8aec5 | 2006-08-07 17:56:37 -0700 | [diff] [blame] | 2175 | |
| 2176 | return nlmsg_end(skb, nlh); |
| 2177 | |
| 2178 | nla_put_failure: |
Patrick McHardy | 2693256 | 2007-01-31 23:16:40 -0800 | [diff] [blame] | 2179 | nlmsg_cancel(skb, nlh); |
| 2180 | return -EMSGSIZE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2181 | } |
| 2182 | |
Tony Zelenoff | 84920c1 | 2012-01-26 22:28:58 +0000 | [diff] [blame] | 2183 | static int pneigh_fill_info(struct sk_buff *skb, struct pneigh_entry *pn, |
| 2184 | u32 pid, u32 seq, int type, unsigned int flags, |
| 2185 | struct neigh_table *tbl) |
| 2186 | { |
| 2187 | struct nlmsghdr *nlh; |
| 2188 | struct ndmsg *ndm; |
| 2189 | |
| 2190 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), flags); |
| 2191 | if (nlh == NULL) |
| 2192 | return -EMSGSIZE; |
| 2193 | |
| 2194 | ndm = nlmsg_data(nlh); |
| 2195 | ndm->ndm_family = tbl->family; |
| 2196 | ndm->ndm_pad1 = 0; |
| 2197 | ndm->ndm_pad2 = 0; |
| 2198 | ndm->ndm_flags = pn->flags | NTF_PROXY; |
| 2199 | ndm->ndm_type = NDA_DST; |
| 2200 | ndm->ndm_ifindex = pn->dev->ifindex; |
| 2201 | ndm->ndm_state = NUD_NONE; |
| 2202 | |
David S. Miller | 9a6308d | 2012-04-01 20:06:28 -0400 | [diff] [blame] | 2203 | if (nla_put(skb, NDA_DST, tbl->key_len, pn->key)) |
| 2204 | goto nla_put_failure; |
Tony Zelenoff | 84920c1 | 2012-01-26 22:28:58 +0000 | [diff] [blame] | 2205 | |
| 2206 | return nlmsg_end(skb, nlh); |
| 2207 | |
| 2208 | nla_put_failure: |
| 2209 | nlmsg_cancel(skb, nlh); |
| 2210 | return -EMSGSIZE; |
| 2211 | } |
| 2212 | |
Thomas Graf | d961db3 | 2007-08-08 23:12:56 -0700 | [diff] [blame] | 2213 | static void neigh_update_notify(struct neighbour *neigh) |
| 2214 | { |
| 2215 | call_netevent_notifiers(NETEVENT_NEIGH_UPDATE, neigh); |
| 2216 | __neigh_notify(neigh, RTM_NEWNEIGH, 0); |
| 2217 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2218 | |
| 2219 | static int neigh_dump_table(struct neigh_table *tbl, struct sk_buff *skb, |
| 2220 | struct netlink_callback *cb) |
| 2221 | { |
Eric Dumazet | 767e97e | 2010-10-06 17:49:21 -0700 | [diff] [blame] | 2222 | struct net *net = sock_net(skb->sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2223 | struct neighbour *n; |
| 2224 | int rc, h, s_h = cb->args[1]; |
| 2225 | int idx, s_idx = idx = cb->args[2]; |
Eric Dumazet | d6bf781 | 2010-10-04 06:15:44 +0000 | [diff] [blame] | 2226 | struct neigh_hash_table *nht; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2227 | |
Eric Dumazet | d6bf781 | 2010-10-04 06:15:44 +0000 | [diff] [blame] | 2228 | rcu_read_lock_bh(); |
| 2229 | nht = rcu_dereference_bh(tbl->nht); |
| 2230 | |
Eric Dumazet | 4bd6683 | 2012-06-07 04:58:35 +0000 | [diff] [blame] | 2231 | for (h = s_h; h < (1 << nht->hash_shift); h++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2232 | if (h > s_h) |
| 2233 | s_idx = 0; |
Eric Dumazet | 767e97e | 2010-10-06 17:49:21 -0700 | [diff] [blame] | 2234 | for (n = rcu_dereference_bh(nht->hash_buckets[h]), idx = 0; |
| 2235 | n != NULL; |
| 2236 | n = rcu_dereference_bh(n->next)) { |
Octavian Purdila | 09ad9bc | 2009-11-25 15:14:13 -0800 | [diff] [blame] | 2237 | if (!net_eq(dev_net(n->dev), net)) |
Eric W. Biederman | 426b530 | 2008-01-24 00:13:18 -0800 | [diff] [blame] | 2238 | continue; |
Gautam Kachroo | efc683f | 2009-02-06 00:52:04 -0800 | [diff] [blame] | 2239 | if (idx < s_idx) |
| 2240 | goto next; |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2241 | if (neigh_fill_info(skb, n, NETLINK_CB(cb->skb).portid, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2242 | cb->nlh->nlmsg_seq, |
Jamal Hadi Salim | b6544c0 | 2005-06-18 22:54:12 -0700 | [diff] [blame] | 2243 | RTM_NEWNEIGH, |
| 2244 | NLM_F_MULTI) <= 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2245 | rc = -1; |
| 2246 | goto out; |
| 2247 | } |
Eric Dumazet | 767e97e | 2010-10-06 17:49:21 -0700 | [diff] [blame] | 2248 | next: |
Gautam Kachroo | efc683f | 2009-02-06 00:52:04 -0800 | [diff] [blame] | 2249 | idx++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2250 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2251 | } |
| 2252 | rc = skb->len; |
| 2253 | out: |
Eric Dumazet | d6bf781 | 2010-10-04 06:15:44 +0000 | [diff] [blame] | 2254 | rcu_read_unlock_bh(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2255 | cb->args[1] = h; |
| 2256 | cb->args[2] = idx; |
| 2257 | return rc; |
| 2258 | } |
| 2259 | |
Tony Zelenoff | 84920c1 | 2012-01-26 22:28:58 +0000 | [diff] [blame] | 2260 | static int pneigh_dump_table(struct neigh_table *tbl, struct sk_buff *skb, |
| 2261 | struct netlink_callback *cb) |
| 2262 | { |
| 2263 | struct pneigh_entry *n; |
| 2264 | struct net *net = sock_net(skb->sk); |
| 2265 | int rc, h, s_h = cb->args[3]; |
| 2266 | int idx, s_idx = idx = cb->args[4]; |
| 2267 | |
| 2268 | read_lock_bh(&tbl->lock); |
| 2269 | |
Eric Dumazet | 4bd6683 | 2012-06-07 04:58:35 +0000 | [diff] [blame] | 2270 | for (h = s_h; h <= PNEIGH_HASHMASK; h++) { |
Tony Zelenoff | 84920c1 | 2012-01-26 22:28:58 +0000 | [diff] [blame] | 2271 | if (h > s_h) |
| 2272 | s_idx = 0; |
| 2273 | for (n = tbl->phash_buckets[h], idx = 0; n; n = n->next) { |
| 2274 | if (dev_net(n->dev) != net) |
| 2275 | continue; |
| 2276 | if (idx < s_idx) |
| 2277 | goto next; |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2278 | if (pneigh_fill_info(skb, n, NETLINK_CB(cb->skb).portid, |
Tony Zelenoff | 84920c1 | 2012-01-26 22:28:58 +0000 | [diff] [blame] | 2279 | cb->nlh->nlmsg_seq, |
| 2280 | RTM_NEWNEIGH, |
| 2281 | NLM_F_MULTI, tbl) <= 0) { |
| 2282 | read_unlock_bh(&tbl->lock); |
| 2283 | rc = -1; |
| 2284 | goto out; |
| 2285 | } |
| 2286 | next: |
| 2287 | idx++; |
| 2288 | } |
| 2289 | } |
| 2290 | |
| 2291 | read_unlock_bh(&tbl->lock); |
| 2292 | rc = skb->len; |
| 2293 | out: |
| 2294 | cb->args[3] = h; |
| 2295 | cb->args[4] = idx; |
| 2296 | return rc; |
| 2297 | |
| 2298 | } |
| 2299 | |
Thomas Graf | c8822a4 | 2007-03-22 11:50:06 -0700 | [diff] [blame] | 2300 | 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] | 2301 | { |
| 2302 | struct neigh_table *tbl; |
| 2303 | int t, family, s_t; |
Tony Zelenoff | 84920c1 | 2012-01-26 22:28:58 +0000 | [diff] [blame] | 2304 | int proxy = 0; |
Eric Dumazet | 4bd6683 | 2012-06-07 04:58:35 +0000 | [diff] [blame] | 2305 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2306 | |
| 2307 | read_lock(&neigh_tbl_lock); |
Thomas Graf | 8b8aec5 | 2006-08-07 17:56:37 -0700 | [diff] [blame] | 2308 | family = ((struct rtgenmsg *) nlmsg_data(cb->nlh))->rtgen_family; |
Tony Zelenoff | 84920c1 | 2012-01-26 22:28:58 +0000 | [diff] [blame] | 2309 | |
| 2310 | /* check for full ndmsg structure presence, family member is |
| 2311 | * the same for both structures |
| 2312 | */ |
| 2313 | if (nlmsg_len(cb->nlh) >= sizeof(struct ndmsg) && |
| 2314 | ((struct ndmsg *) nlmsg_data(cb->nlh))->ndm_flags == NTF_PROXY) |
| 2315 | proxy = 1; |
| 2316 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2317 | s_t = cb->args[0]; |
| 2318 | |
Eric Dumazet | 4bd6683 | 2012-06-07 04:58:35 +0000 | [diff] [blame] | 2319 | for (tbl = neigh_tables, t = 0; tbl; |
Tony Zelenoff | 84920c1 | 2012-01-26 22:28:58 +0000 | [diff] [blame] | 2320 | tbl = tbl->next, t++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2321 | if (t < s_t || (family && tbl->family != family)) |
| 2322 | continue; |
| 2323 | if (t > s_t) |
| 2324 | memset(&cb->args[1], 0, sizeof(cb->args) - |
| 2325 | sizeof(cb->args[0])); |
Tony Zelenoff | 84920c1 | 2012-01-26 22:28:58 +0000 | [diff] [blame] | 2326 | if (proxy) |
| 2327 | err = pneigh_dump_table(tbl, skb, cb); |
| 2328 | else |
| 2329 | err = neigh_dump_table(tbl, skb, cb); |
Eric Dumazet | 4bd6683 | 2012-06-07 04:58:35 +0000 | [diff] [blame] | 2330 | if (err < 0) |
| 2331 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2332 | } |
| 2333 | read_unlock(&neigh_tbl_lock); |
| 2334 | |
| 2335 | cb->args[0] = t; |
| 2336 | return skb->len; |
| 2337 | } |
| 2338 | |
| 2339 | void neigh_for_each(struct neigh_table *tbl, void (*cb)(struct neighbour *, void *), void *cookie) |
| 2340 | { |
| 2341 | int chain; |
Eric Dumazet | d6bf781 | 2010-10-04 06:15:44 +0000 | [diff] [blame] | 2342 | struct neigh_hash_table *nht; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2343 | |
Eric Dumazet | d6bf781 | 2010-10-04 06:15:44 +0000 | [diff] [blame] | 2344 | rcu_read_lock_bh(); |
| 2345 | nht = rcu_dereference_bh(tbl->nht); |
| 2346 | |
Eric Dumazet | 767e97e | 2010-10-06 17:49:21 -0700 | [diff] [blame] | 2347 | read_lock(&tbl->lock); /* avoid resizes */ |
David S. Miller | cd08933 | 2011-07-11 01:28:12 -0700 | [diff] [blame] | 2348 | for (chain = 0; chain < (1 << nht->hash_shift); chain++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2349 | struct neighbour *n; |
| 2350 | |
Eric Dumazet | 767e97e | 2010-10-06 17:49:21 -0700 | [diff] [blame] | 2351 | for (n = rcu_dereference_bh(nht->hash_buckets[chain]); |
| 2352 | n != NULL; |
| 2353 | n = rcu_dereference_bh(n->next)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2354 | cb(n, cookie); |
| 2355 | } |
Eric Dumazet | d6bf781 | 2010-10-04 06:15:44 +0000 | [diff] [blame] | 2356 | read_unlock(&tbl->lock); |
| 2357 | rcu_read_unlock_bh(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2358 | } |
| 2359 | EXPORT_SYMBOL(neigh_for_each); |
| 2360 | |
| 2361 | /* The tbl->lock must be held as a writer and BH disabled. */ |
| 2362 | void __neigh_for_each_release(struct neigh_table *tbl, |
| 2363 | int (*cb)(struct neighbour *)) |
| 2364 | { |
| 2365 | int chain; |
Eric Dumazet | d6bf781 | 2010-10-04 06:15:44 +0000 | [diff] [blame] | 2366 | struct neigh_hash_table *nht; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2367 | |
Eric Dumazet | d6bf781 | 2010-10-04 06:15:44 +0000 | [diff] [blame] | 2368 | nht = rcu_dereference_protected(tbl->nht, |
| 2369 | lockdep_is_held(&tbl->lock)); |
David S. Miller | cd08933 | 2011-07-11 01:28:12 -0700 | [diff] [blame] | 2370 | for (chain = 0; chain < (1 << nht->hash_shift); chain++) { |
Eric Dumazet | 767e97e | 2010-10-06 17:49:21 -0700 | [diff] [blame] | 2371 | struct neighbour *n; |
| 2372 | struct neighbour __rcu **np; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2373 | |
Eric Dumazet | d6bf781 | 2010-10-04 06:15:44 +0000 | [diff] [blame] | 2374 | np = &nht->hash_buckets[chain]; |
Eric Dumazet | 767e97e | 2010-10-06 17:49:21 -0700 | [diff] [blame] | 2375 | while ((n = rcu_dereference_protected(*np, |
| 2376 | lockdep_is_held(&tbl->lock))) != NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2377 | int release; |
| 2378 | |
| 2379 | write_lock(&n->lock); |
| 2380 | release = cb(n); |
| 2381 | if (release) { |
Eric Dumazet | 767e97e | 2010-10-06 17:49:21 -0700 | [diff] [blame] | 2382 | rcu_assign_pointer(*np, |
| 2383 | rcu_dereference_protected(n->next, |
| 2384 | lockdep_is_held(&tbl->lock))); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2385 | n->dead = 1; |
| 2386 | } else |
| 2387 | np = &n->next; |
| 2388 | write_unlock(&n->lock); |
Thomas Graf | 4f49455 | 2007-08-08 23:12:36 -0700 | [diff] [blame] | 2389 | if (release) |
| 2390 | neigh_cleanup_and_release(n); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2391 | } |
| 2392 | } |
| 2393 | } |
| 2394 | EXPORT_SYMBOL(__neigh_for_each_release); |
| 2395 | |
| 2396 | #ifdef CONFIG_PROC_FS |
| 2397 | |
| 2398 | static struct neighbour *neigh_get_first(struct seq_file *seq) |
| 2399 | { |
| 2400 | struct neigh_seq_state *state = seq->private; |
YOSHIFUJI Hideaki | 1218854 | 2008-03-26 02:36:06 +0900 | [diff] [blame] | 2401 | struct net *net = seq_file_net(seq); |
Eric Dumazet | d6bf781 | 2010-10-04 06:15:44 +0000 | [diff] [blame] | 2402 | struct neigh_hash_table *nht = state->nht; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2403 | struct neighbour *n = NULL; |
| 2404 | int bucket = state->bucket; |
| 2405 | |
| 2406 | state->flags &= ~NEIGH_SEQ_IS_PNEIGH; |
David S. Miller | cd08933 | 2011-07-11 01:28:12 -0700 | [diff] [blame] | 2407 | for (bucket = 0; bucket < (1 << nht->hash_shift); bucket++) { |
Eric Dumazet | 767e97e | 2010-10-06 17:49:21 -0700 | [diff] [blame] | 2408 | n = rcu_dereference_bh(nht->hash_buckets[bucket]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2409 | |
| 2410 | while (n) { |
YOSHIFUJI Hideaki | 878628f | 2008-03-26 03:57:35 +0900 | [diff] [blame] | 2411 | if (!net_eq(dev_net(n->dev), net)) |
Eric W. Biederman | 426b530 | 2008-01-24 00:13:18 -0800 | [diff] [blame] | 2412 | goto next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2413 | if (state->neigh_sub_iter) { |
| 2414 | loff_t fakep = 0; |
| 2415 | void *v; |
| 2416 | |
| 2417 | v = state->neigh_sub_iter(state, n, &fakep); |
| 2418 | if (!v) |
| 2419 | goto next; |
| 2420 | } |
| 2421 | if (!(state->flags & NEIGH_SEQ_SKIP_NOARP)) |
| 2422 | break; |
| 2423 | if (n->nud_state & ~NUD_NOARP) |
| 2424 | break; |
Eric Dumazet | 767e97e | 2010-10-06 17:49:21 -0700 | [diff] [blame] | 2425 | next: |
| 2426 | n = rcu_dereference_bh(n->next); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2427 | } |
| 2428 | |
| 2429 | if (n) |
| 2430 | break; |
| 2431 | } |
| 2432 | state->bucket = bucket; |
| 2433 | |
| 2434 | return n; |
| 2435 | } |
| 2436 | |
| 2437 | static struct neighbour *neigh_get_next(struct seq_file *seq, |
| 2438 | struct neighbour *n, |
| 2439 | loff_t *pos) |
| 2440 | { |
| 2441 | struct neigh_seq_state *state = seq->private; |
YOSHIFUJI Hideaki | 1218854 | 2008-03-26 02:36:06 +0900 | [diff] [blame] | 2442 | struct net *net = seq_file_net(seq); |
Eric Dumazet | d6bf781 | 2010-10-04 06:15:44 +0000 | [diff] [blame] | 2443 | struct neigh_hash_table *nht = state->nht; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2444 | |
| 2445 | if (state->neigh_sub_iter) { |
| 2446 | void *v = state->neigh_sub_iter(state, n, pos); |
| 2447 | if (v) |
| 2448 | return n; |
| 2449 | } |
Eric Dumazet | 767e97e | 2010-10-06 17:49:21 -0700 | [diff] [blame] | 2450 | n = rcu_dereference_bh(n->next); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2451 | |
| 2452 | while (1) { |
| 2453 | while (n) { |
YOSHIFUJI Hideaki | 878628f | 2008-03-26 03:57:35 +0900 | [diff] [blame] | 2454 | if (!net_eq(dev_net(n->dev), net)) |
Eric W. Biederman | 426b530 | 2008-01-24 00:13:18 -0800 | [diff] [blame] | 2455 | goto next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2456 | if (state->neigh_sub_iter) { |
| 2457 | void *v = state->neigh_sub_iter(state, n, pos); |
| 2458 | if (v) |
| 2459 | return n; |
| 2460 | goto next; |
| 2461 | } |
| 2462 | if (!(state->flags & NEIGH_SEQ_SKIP_NOARP)) |
| 2463 | break; |
| 2464 | |
| 2465 | if (n->nud_state & ~NUD_NOARP) |
| 2466 | break; |
Eric Dumazet | 767e97e | 2010-10-06 17:49:21 -0700 | [diff] [blame] | 2467 | next: |
| 2468 | n = rcu_dereference_bh(n->next); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2469 | } |
| 2470 | |
| 2471 | if (n) |
| 2472 | break; |
| 2473 | |
David S. Miller | cd08933 | 2011-07-11 01:28:12 -0700 | [diff] [blame] | 2474 | if (++state->bucket >= (1 << nht->hash_shift)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2475 | break; |
| 2476 | |
Eric Dumazet | 767e97e | 2010-10-06 17:49:21 -0700 | [diff] [blame] | 2477 | n = rcu_dereference_bh(nht->hash_buckets[state->bucket]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2478 | } |
| 2479 | |
| 2480 | if (n && pos) |
| 2481 | --(*pos); |
| 2482 | return n; |
| 2483 | } |
| 2484 | |
| 2485 | static struct neighbour *neigh_get_idx(struct seq_file *seq, loff_t *pos) |
| 2486 | { |
| 2487 | struct neighbour *n = neigh_get_first(seq); |
| 2488 | |
| 2489 | if (n) { |
Chris Larson | 745e203 | 2008-08-03 01:10:55 -0700 | [diff] [blame] | 2490 | --(*pos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2491 | while (*pos) { |
| 2492 | n = neigh_get_next(seq, n, pos); |
| 2493 | if (!n) |
| 2494 | break; |
| 2495 | } |
| 2496 | } |
| 2497 | return *pos ? NULL : n; |
| 2498 | } |
| 2499 | |
| 2500 | static struct pneigh_entry *pneigh_get_first(struct seq_file *seq) |
| 2501 | { |
| 2502 | struct neigh_seq_state *state = seq->private; |
YOSHIFUJI Hideaki | 1218854 | 2008-03-26 02:36:06 +0900 | [diff] [blame] | 2503 | struct net *net = seq_file_net(seq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2504 | struct neigh_table *tbl = state->tbl; |
| 2505 | struct pneigh_entry *pn = NULL; |
| 2506 | int bucket = state->bucket; |
| 2507 | |
| 2508 | state->flags |= NEIGH_SEQ_IS_PNEIGH; |
| 2509 | for (bucket = 0; bucket <= PNEIGH_HASHMASK; bucket++) { |
| 2510 | pn = tbl->phash_buckets[bucket]; |
YOSHIFUJI Hideaki | 878628f | 2008-03-26 03:57:35 +0900 | [diff] [blame] | 2511 | while (pn && !net_eq(pneigh_net(pn), net)) |
Eric W. Biederman | 426b530 | 2008-01-24 00:13:18 -0800 | [diff] [blame] | 2512 | pn = pn->next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2513 | if (pn) |
| 2514 | break; |
| 2515 | } |
| 2516 | state->bucket = bucket; |
| 2517 | |
| 2518 | return pn; |
| 2519 | } |
| 2520 | |
| 2521 | static struct pneigh_entry *pneigh_get_next(struct seq_file *seq, |
| 2522 | struct pneigh_entry *pn, |
| 2523 | loff_t *pos) |
| 2524 | { |
| 2525 | struct neigh_seq_state *state = seq->private; |
YOSHIFUJI Hideaki | 1218854 | 2008-03-26 02:36:06 +0900 | [diff] [blame] | 2526 | struct net *net = seq_file_net(seq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2527 | struct neigh_table *tbl = state->tbl; |
| 2528 | |
Jorge Boncompte [DTI2] | df07a94 | 2011-11-25 13:24:49 -0500 | [diff] [blame] | 2529 | do { |
| 2530 | pn = pn->next; |
| 2531 | } while (pn && !net_eq(pneigh_net(pn), net)); |
| 2532 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2533 | while (!pn) { |
| 2534 | if (++state->bucket > PNEIGH_HASHMASK) |
| 2535 | break; |
| 2536 | pn = tbl->phash_buckets[state->bucket]; |
YOSHIFUJI Hideaki | 878628f | 2008-03-26 03:57:35 +0900 | [diff] [blame] | 2537 | while (pn && !net_eq(pneigh_net(pn), net)) |
Eric W. Biederman | 426b530 | 2008-01-24 00:13:18 -0800 | [diff] [blame] | 2538 | pn = pn->next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2539 | if (pn) |
| 2540 | break; |
| 2541 | } |
| 2542 | |
| 2543 | if (pn && pos) |
| 2544 | --(*pos); |
| 2545 | |
| 2546 | return pn; |
| 2547 | } |
| 2548 | |
| 2549 | static struct pneigh_entry *pneigh_get_idx(struct seq_file *seq, loff_t *pos) |
| 2550 | { |
| 2551 | struct pneigh_entry *pn = pneigh_get_first(seq); |
| 2552 | |
| 2553 | if (pn) { |
Chris Larson | 745e203 | 2008-08-03 01:10:55 -0700 | [diff] [blame] | 2554 | --(*pos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2555 | while (*pos) { |
| 2556 | pn = pneigh_get_next(seq, pn, pos); |
| 2557 | if (!pn) |
| 2558 | break; |
| 2559 | } |
| 2560 | } |
| 2561 | return *pos ? NULL : pn; |
| 2562 | } |
| 2563 | |
| 2564 | static void *neigh_get_idx_any(struct seq_file *seq, loff_t *pos) |
| 2565 | { |
| 2566 | struct neigh_seq_state *state = seq->private; |
| 2567 | void *rc; |
Chris Larson | 745e203 | 2008-08-03 01:10:55 -0700 | [diff] [blame] | 2568 | loff_t idxpos = *pos; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2569 | |
Chris Larson | 745e203 | 2008-08-03 01:10:55 -0700 | [diff] [blame] | 2570 | rc = neigh_get_idx(seq, &idxpos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2571 | if (!rc && !(state->flags & NEIGH_SEQ_NEIGH_ONLY)) |
Chris Larson | 745e203 | 2008-08-03 01:10:55 -0700 | [diff] [blame] | 2572 | rc = pneigh_get_idx(seq, &idxpos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2573 | |
| 2574 | return rc; |
| 2575 | } |
| 2576 | |
| 2577 | void *neigh_seq_start(struct seq_file *seq, loff_t *pos, struct neigh_table *tbl, unsigned int neigh_seq_flags) |
Eric Dumazet | d6bf781 | 2010-10-04 06:15:44 +0000 | [diff] [blame] | 2578 | __acquires(rcu_bh) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2579 | { |
| 2580 | struct neigh_seq_state *state = seq->private; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2581 | |
| 2582 | state->tbl = tbl; |
| 2583 | state->bucket = 0; |
| 2584 | state->flags = (neigh_seq_flags & ~NEIGH_SEQ_IS_PNEIGH); |
| 2585 | |
Eric Dumazet | d6bf781 | 2010-10-04 06:15:44 +0000 | [diff] [blame] | 2586 | rcu_read_lock_bh(); |
| 2587 | state->nht = rcu_dereference_bh(tbl->nht); |
Eric Dumazet | 767e97e | 2010-10-06 17:49:21 -0700 | [diff] [blame] | 2588 | |
Chris Larson | 745e203 | 2008-08-03 01:10:55 -0700 | [diff] [blame] | 2589 | return *pos ? neigh_get_idx_any(seq, pos) : SEQ_START_TOKEN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2590 | } |
| 2591 | EXPORT_SYMBOL(neigh_seq_start); |
| 2592 | |
| 2593 | void *neigh_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| 2594 | { |
| 2595 | struct neigh_seq_state *state; |
| 2596 | void *rc; |
| 2597 | |
| 2598 | if (v == SEQ_START_TOKEN) { |
Chris Larson | bff6973 | 2008-08-03 01:02:41 -0700 | [diff] [blame] | 2599 | rc = neigh_get_first(seq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2600 | goto out; |
| 2601 | } |
| 2602 | |
| 2603 | state = seq->private; |
| 2604 | if (!(state->flags & NEIGH_SEQ_IS_PNEIGH)) { |
| 2605 | rc = neigh_get_next(seq, v, NULL); |
| 2606 | if (rc) |
| 2607 | goto out; |
| 2608 | if (!(state->flags & NEIGH_SEQ_NEIGH_ONLY)) |
| 2609 | rc = pneigh_get_first(seq); |
| 2610 | } else { |
| 2611 | BUG_ON(state->flags & NEIGH_SEQ_NEIGH_ONLY); |
| 2612 | rc = pneigh_get_next(seq, v, NULL); |
| 2613 | } |
| 2614 | out: |
| 2615 | ++(*pos); |
| 2616 | return rc; |
| 2617 | } |
| 2618 | EXPORT_SYMBOL(neigh_seq_next); |
| 2619 | |
| 2620 | void neigh_seq_stop(struct seq_file *seq, void *v) |
Eric Dumazet | d6bf781 | 2010-10-04 06:15:44 +0000 | [diff] [blame] | 2621 | __releases(rcu_bh) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2622 | { |
Eric Dumazet | d6bf781 | 2010-10-04 06:15:44 +0000 | [diff] [blame] | 2623 | rcu_read_unlock_bh(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2624 | } |
| 2625 | EXPORT_SYMBOL(neigh_seq_stop); |
| 2626 | |
| 2627 | /* statistics via seq_file */ |
| 2628 | |
| 2629 | static void *neigh_stat_seq_start(struct seq_file *seq, loff_t *pos) |
| 2630 | { |
Alexey Dobriyan | 81c1ebf | 2010-01-22 10:16:05 +0000 | [diff] [blame] | 2631 | struct neigh_table *tbl = seq->private; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2632 | int cpu; |
| 2633 | |
| 2634 | if (*pos == 0) |
| 2635 | return SEQ_START_TOKEN; |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 2636 | |
Rusty Russell | 0f23174a | 2008-12-29 12:23:42 +0000 | [diff] [blame] | 2637 | for (cpu = *pos-1; cpu < nr_cpu_ids; ++cpu) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2638 | if (!cpu_possible(cpu)) |
| 2639 | continue; |
| 2640 | *pos = cpu+1; |
| 2641 | return per_cpu_ptr(tbl->stats, cpu); |
| 2642 | } |
| 2643 | return NULL; |
| 2644 | } |
| 2645 | |
| 2646 | static void *neigh_stat_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| 2647 | { |
Alexey Dobriyan | 81c1ebf | 2010-01-22 10:16:05 +0000 | [diff] [blame] | 2648 | struct neigh_table *tbl = seq->private; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2649 | int cpu; |
| 2650 | |
Rusty Russell | 0f23174a | 2008-12-29 12:23:42 +0000 | [diff] [blame] | 2651 | for (cpu = *pos; cpu < nr_cpu_ids; ++cpu) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2652 | if (!cpu_possible(cpu)) |
| 2653 | continue; |
| 2654 | *pos = cpu+1; |
| 2655 | return per_cpu_ptr(tbl->stats, cpu); |
| 2656 | } |
| 2657 | return NULL; |
| 2658 | } |
| 2659 | |
| 2660 | static void neigh_stat_seq_stop(struct seq_file *seq, void *v) |
| 2661 | { |
| 2662 | |
| 2663 | } |
| 2664 | |
| 2665 | static int neigh_stat_seq_show(struct seq_file *seq, void *v) |
| 2666 | { |
Alexey Dobriyan | 81c1ebf | 2010-01-22 10:16:05 +0000 | [diff] [blame] | 2667 | struct neigh_table *tbl = seq->private; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2668 | struct neigh_statistics *st = v; |
| 2669 | |
| 2670 | if (v == SEQ_START_TOKEN) { |
Neil Horman | 9a6d276 | 2008-07-16 20:50:49 -0700 | [diff] [blame] | 2671 | seq_printf(seq, "entries allocs destroys hash_grows lookups hits res_failed rcv_probes_mcast rcv_probes_ucast periodic_gc_runs forced_gc_runs unresolved_discards\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2672 | return 0; |
| 2673 | } |
| 2674 | |
| 2675 | seq_printf(seq, "%08x %08lx %08lx %08lx %08lx %08lx %08lx " |
Neil Horman | 9a6d276 | 2008-07-16 20:50:49 -0700 | [diff] [blame] | 2676 | "%08lx %08lx %08lx %08lx %08lx\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2677 | atomic_read(&tbl->entries), |
| 2678 | |
| 2679 | st->allocs, |
| 2680 | st->destroys, |
| 2681 | st->hash_grows, |
| 2682 | |
| 2683 | st->lookups, |
| 2684 | st->hits, |
| 2685 | |
| 2686 | st->res_failed, |
| 2687 | |
| 2688 | st->rcv_probes_mcast, |
| 2689 | st->rcv_probes_ucast, |
| 2690 | |
| 2691 | st->periodic_gc_runs, |
Neil Horman | 9a6d276 | 2008-07-16 20:50:49 -0700 | [diff] [blame] | 2692 | st->forced_gc_runs, |
| 2693 | st->unres_discards |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2694 | ); |
| 2695 | |
| 2696 | return 0; |
| 2697 | } |
| 2698 | |
Stephen Hemminger | f690808 | 2007-03-12 14:34:29 -0700 | [diff] [blame] | 2699 | static const struct seq_operations neigh_stat_seq_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2700 | .start = neigh_stat_seq_start, |
| 2701 | .next = neigh_stat_seq_next, |
| 2702 | .stop = neigh_stat_seq_stop, |
| 2703 | .show = neigh_stat_seq_show, |
| 2704 | }; |
| 2705 | |
| 2706 | static int neigh_stat_seq_open(struct inode *inode, struct file *file) |
| 2707 | { |
| 2708 | int ret = seq_open(file, &neigh_stat_seq_ops); |
| 2709 | |
| 2710 | if (!ret) { |
| 2711 | struct seq_file *sf = file->private_data; |
Al Viro | d9dda78 | 2013-03-31 18:16:14 -0400 | [diff] [blame] | 2712 | sf->private = PDE_DATA(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2713 | } |
| 2714 | return ret; |
| 2715 | }; |
| 2716 | |
Arjan van de Ven | 9a32144 | 2007-02-12 00:55:35 -0800 | [diff] [blame] | 2717 | static const struct file_operations neigh_stat_seq_fops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2718 | .owner = THIS_MODULE, |
| 2719 | .open = neigh_stat_seq_open, |
| 2720 | .read = seq_read, |
| 2721 | .llseek = seq_lseek, |
| 2722 | .release = seq_release, |
| 2723 | }; |
| 2724 | |
| 2725 | #endif /* CONFIG_PROC_FS */ |
| 2726 | |
Thomas Graf | 339bf98 | 2006-11-10 14:10:15 -0800 | [diff] [blame] | 2727 | static inline size_t neigh_nlmsg_size(void) |
| 2728 | { |
| 2729 | return NLMSG_ALIGN(sizeof(struct ndmsg)) |
| 2730 | + nla_total_size(MAX_ADDR_LEN) /* NDA_DST */ |
| 2731 | + nla_total_size(MAX_ADDR_LEN) /* NDA_LLADDR */ |
| 2732 | + nla_total_size(sizeof(struct nda_cacheinfo)) |
| 2733 | + nla_total_size(4); /* NDA_PROBES */ |
| 2734 | } |
| 2735 | |
Thomas Graf | b867331 | 2006-08-15 00:33:14 -0700 | [diff] [blame] | 2736 | static void __neigh_notify(struct neighbour *n, int type, int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2737 | { |
YOSHIFUJI Hideaki | c346dca | 2008-03-25 21:47:49 +0900 | [diff] [blame] | 2738 | struct net *net = dev_net(n->dev); |
Thomas Graf | 8b8aec5 | 2006-08-07 17:56:37 -0700 | [diff] [blame] | 2739 | struct sk_buff *skb; |
Thomas Graf | b867331 | 2006-08-15 00:33:14 -0700 | [diff] [blame] | 2740 | int err = -ENOBUFS; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2741 | |
Thomas Graf | 339bf98 | 2006-11-10 14:10:15 -0800 | [diff] [blame] | 2742 | skb = nlmsg_new(neigh_nlmsg_size(), GFP_ATOMIC); |
Thomas Graf | 8b8aec5 | 2006-08-07 17:56:37 -0700 | [diff] [blame] | 2743 | if (skb == NULL) |
Thomas Graf | b867331 | 2006-08-15 00:33:14 -0700 | [diff] [blame] | 2744 | goto errout; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2745 | |
Thomas Graf | b867331 | 2006-08-15 00:33:14 -0700 | [diff] [blame] | 2746 | err = neigh_fill_info(skb, n, 0, 0, type, flags); |
Patrick McHardy | 2693256 | 2007-01-31 23:16:40 -0800 | [diff] [blame] | 2747 | if (err < 0) { |
| 2748 | /* -EMSGSIZE implies BUG in neigh_nlmsg_size() */ |
| 2749 | WARN_ON(err == -EMSGSIZE); |
| 2750 | kfree_skb(skb); |
| 2751 | goto errout; |
| 2752 | } |
Pablo Neira Ayuso | 1ce85fe | 2009-02-24 23:18:28 -0800 | [diff] [blame] | 2753 | rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC); |
| 2754 | return; |
Thomas Graf | b867331 | 2006-08-15 00:33:14 -0700 | [diff] [blame] | 2755 | errout: |
| 2756 | if (err < 0) |
Eric W. Biederman | 426b530 | 2008-01-24 00:13:18 -0800 | [diff] [blame] | 2757 | rtnl_set_sk_err(net, RTNLGRP_NEIGH, err); |
Thomas Graf | b867331 | 2006-08-15 00:33:14 -0700 | [diff] [blame] | 2758 | } |
| 2759 | |
Thomas Graf | d961db3 | 2007-08-08 23:12:56 -0700 | [diff] [blame] | 2760 | #ifdef CONFIG_ARPD |
Thomas Graf | b867331 | 2006-08-15 00:33:14 -0700 | [diff] [blame] | 2761 | void neigh_app_ns(struct neighbour *n) |
| 2762 | { |
| 2763 | __neigh_notify(n, RTM_GETNEIGH, NLM_F_REQUEST); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2764 | } |
YOSHIFUJI Hideaki | 0a20450 | 2008-03-24 18:39:10 +0900 | [diff] [blame] | 2765 | EXPORT_SYMBOL(neigh_app_ns); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2766 | #endif /* CONFIG_ARPD */ |
| 2767 | |
| 2768 | #ifdef CONFIG_SYSCTL |
Cong Wang | b93196d | 2012-12-06 10:04:04 +0800 | [diff] [blame] | 2769 | static int zero; |
Francesco Fusco | 555445c | 2013-07-24 10:39:06 +0200 | [diff] [blame] | 2770 | static int int_max = INT_MAX; |
Cong Wang | b93196d | 2012-12-06 10:04:04 +0800 | [diff] [blame] | 2771 | static int unres_qlen_max = INT_MAX / SKB_TRUESIZE(ETH_FRAME_LEN); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2772 | |
Joe Perches | fe2c633 | 2013-06-11 23:04:25 -0700 | [diff] [blame] | 2773 | static int proc_unres_qlen(struct ctl_table *ctl, int write, |
| 2774 | void __user *buffer, size_t *lenp, loff_t *ppos) |
Eric Dumazet | 8b5c171 | 2011-11-09 12:07:14 +0000 | [diff] [blame] | 2775 | { |
| 2776 | int size, ret; |
Joe Perches | fe2c633 | 2013-06-11 23:04:25 -0700 | [diff] [blame] | 2777 | struct ctl_table tmp = *ctl; |
Eric Dumazet | 8b5c171 | 2011-11-09 12:07:14 +0000 | [diff] [blame] | 2778 | |
Shan Wei | ce46cc6 | 2012-12-04 18:49:15 +0000 | [diff] [blame] | 2779 | tmp.extra1 = &zero; |
| 2780 | tmp.extra2 = &unres_qlen_max; |
Eric Dumazet | 8b5c171 | 2011-11-09 12:07:14 +0000 | [diff] [blame] | 2781 | tmp.data = &size; |
Shan Wei | ce46cc6 | 2012-12-04 18:49:15 +0000 | [diff] [blame] | 2782 | |
| 2783 | size = *(int *)ctl->data / SKB_TRUESIZE(ETH_FRAME_LEN); |
| 2784 | ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos); |
| 2785 | |
Eric Dumazet | 8b5c171 | 2011-11-09 12:07:14 +0000 | [diff] [blame] | 2786 | if (write && !ret) |
| 2787 | *(int *)ctl->data = size * SKB_TRUESIZE(ETH_FRAME_LEN); |
| 2788 | return ret; |
| 2789 | } |
| 2790 | |
| 2791 | enum { |
| 2792 | NEIGH_VAR_MCAST_PROBE, |
| 2793 | NEIGH_VAR_UCAST_PROBE, |
| 2794 | NEIGH_VAR_APP_PROBE, |
| 2795 | NEIGH_VAR_RETRANS_TIME, |
| 2796 | NEIGH_VAR_BASE_REACHABLE_TIME, |
| 2797 | NEIGH_VAR_DELAY_PROBE_TIME, |
| 2798 | NEIGH_VAR_GC_STALETIME, |
| 2799 | NEIGH_VAR_QUEUE_LEN, |
| 2800 | NEIGH_VAR_QUEUE_LEN_BYTES, |
| 2801 | NEIGH_VAR_PROXY_QLEN, |
| 2802 | NEIGH_VAR_ANYCAST_DELAY, |
| 2803 | NEIGH_VAR_PROXY_DELAY, |
| 2804 | NEIGH_VAR_LOCKTIME, |
| 2805 | NEIGH_VAR_RETRANS_TIME_MS, |
| 2806 | NEIGH_VAR_BASE_REACHABLE_TIME_MS, |
| 2807 | NEIGH_VAR_GC_INTERVAL, |
| 2808 | NEIGH_VAR_GC_THRESH1, |
| 2809 | NEIGH_VAR_GC_THRESH2, |
| 2810 | NEIGH_VAR_GC_THRESH3, |
| 2811 | NEIGH_VAR_MAX |
| 2812 | }; |
Eric W. Biederman | 54716e3 | 2010-02-14 03:27:03 +0000 | [diff] [blame] | 2813 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2814 | static struct neigh_sysctl_table { |
| 2815 | struct ctl_table_header *sysctl_header; |
Eric Dumazet | 8b5c171 | 2011-11-09 12:07:14 +0000 | [diff] [blame] | 2816 | struct ctl_table neigh_vars[NEIGH_VAR_MAX + 1]; |
Brian Haley | ab32ea5 | 2006-09-22 14:15:41 -0700 | [diff] [blame] | 2817 | } neigh_sysctl_template __read_mostly = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2818 | .neigh_vars = { |
Eric Dumazet | 8b5c171 | 2011-11-09 12:07:14 +0000 | [diff] [blame] | 2819 | [NEIGH_VAR_MCAST_PROBE] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2820 | .procname = "mcast_solicit", |
| 2821 | .maxlen = sizeof(int), |
| 2822 | .mode = 0644, |
Francesco Fusco | 555445c | 2013-07-24 10:39:06 +0200 | [diff] [blame] | 2823 | .extra1 = &zero, |
| 2824 | .extra2 = &int_max, |
| 2825 | .proc_handler = proc_dointvec_minmax, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2826 | }, |
Eric Dumazet | 8b5c171 | 2011-11-09 12:07:14 +0000 | [diff] [blame] | 2827 | [NEIGH_VAR_UCAST_PROBE] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2828 | .procname = "ucast_solicit", |
| 2829 | .maxlen = sizeof(int), |
| 2830 | .mode = 0644, |
Francesco Fusco | 555445c | 2013-07-24 10:39:06 +0200 | [diff] [blame] | 2831 | .extra1 = &zero, |
| 2832 | .extra2 = &int_max, |
| 2833 | .proc_handler = proc_dointvec_minmax, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2834 | }, |
Eric Dumazet | 8b5c171 | 2011-11-09 12:07:14 +0000 | [diff] [blame] | 2835 | [NEIGH_VAR_APP_PROBE] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2836 | .procname = "app_solicit", |
| 2837 | .maxlen = sizeof(int), |
| 2838 | .mode = 0644, |
Francesco Fusco | 555445c | 2013-07-24 10:39:06 +0200 | [diff] [blame] | 2839 | .extra1 = &zero, |
| 2840 | .extra2 = &int_max, |
| 2841 | .proc_handler = proc_dointvec_minmax, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2842 | }, |
Eric Dumazet | 8b5c171 | 2011-11-09 12:07:14 +0000 | [diff] [blame] | 2843 | [NEIGH_VAR_RETRANS_TIME] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2844 | .procname = "retrans_time", |
| 2845 | .maxlen = sizeof(int), |
| 2846 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 2847 | .proc_handler = proc_dointvec_userhz_jiffies, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2848 | }, |
Eric Dumazet | 8b5c171 | 2011-11-09 12:07:14 +0000 | [diff] [blame] | 2849 | [NEIGH_VAR_BASE_REACHABLE_TIME] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2850 | .procname = "base_reachable_time", |
| 2851 | .maxlen = sizeof(int), |
| 2852 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 2853 | .proc_handler = proc_dointvec_jiffies, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2854 | }, |
Eric Dumazet | 8b5c171 | 2011-11-09 12:07:14 +0000 | [diff] [blame] | 2855 | [NEIGH_VAR_DELAY_PROBE_TIME] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2856 | .procname = "delay_first_probe_time", |
| 2857 | .maxlen = sizeof(int), |
| 2858 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 2859 | .proc_handler = proc_dointvec_jiffies, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2860 | }, |
Eric Dumazet | 8b5c171 | 2011-11-09 12:07:14 +0000 | [diff] [blame] | 2861 | [NEIGH_VAR_GC_STALETIME] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2862 | .procname = "gc_stale_time", |
| 2863 | .maxlen = sizeof(int), |
| 2864 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 2865 | .proc_handler = proc_dointvec_jiffies, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2866 | }, |
Eric Dumazet | 8b5c171 | 2011-11-09 12:07:14 +0000 | [diff] [blame] | 2867 | [NEIGH_VAR_QUEUE_LEN] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2868 | .procname = "unres_qlen", |
| 2869 | .maxlen = sizeof(int), |
| 2870 | .mode = 0644, |
Eric Dumazet | 8b5c171 | 2011-11-09 12:07:14 +0000 | [diff] [blame] | 2871 | .proc_handler = proc_unres_qlen, |
| 2872 | }, |
| 2873 | [NEIGH_VAR_QUEUE_LEN_BYTES] = { |
| 2874 | .procname = "unres_qlen_bytes", |
| 2875 | .maxlen = sizeof(int), |
| 2876 | .mode = 0644, |
Shan Wei | ce46cc6 | 2012-12-04 18:49:15 +0000 | [diff] [blame] | 2877 | .extra1 = &zero, |
| 2878 | .proc_handler = proc_dointvec_minmax, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2879 | }, |
Eric Dumazet | 8b5c171 | 2011-11-09 12:07:14 +0000 | [diff] [blame] | 2880 | [NEIGH_VAR_PROXY_QLEN] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2881 | .procname = "proxy_qlen", |
| 2882 | .maxlen = sizeof(int), |
| 2883 | .mode = 0644, |
Francesco Fusco | 555445c | 2013-07-24 10:39:06 +0200 | [diff] [blame] | 2884 | .extra1 = &zero, |
| 2885 | .extra2 = &int_max, |
| 2886 | .proc_handler = proc_dointvec_minmax, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2887 | }, |
Eric Dumazet | 8b5c171 | 2011-11-09 12:07:14 +0000 | [diff] [blame] | 2888 | [NEIGH_VAR_ANYCAST_DELAY] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2889 | .procname = "anycast_delay", |
| 2890 | .maxlen = sizeof(int), |
| 2891 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 2892 | .proc_handler = proc_dointvec_userhz_jiffies, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2893 | }, |
Eric Dumazet | 8b5c171 | 2011-11-09 12:07:14 +0000 | [diff] [blame] | 2894 | [NEIGH_VAR_PROXY_DELAY] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2895 | .procname = "proxy_delay", |
| 2896 | .maxlen = sizeof(int), |
| 2897 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 2898 | .proc_handler = proc_dointvec_userhz_jiffies, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2899 | }, |
Eric Dumazet | 8b5c171 | 2011-11-09 12:07:14 +0000 | [diff] [blame] | 2900 | [NEIGH_VAR_LOCKTIME] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2901 | .procname = "locktime", |
| 2902 | .maxlen = sizeof(int), |
| 2903 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 2904 | .proc_handler = proc_dointvec_userhz_jiffies, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2905 | }, |
Eric Dumazet | 8b5c171 | 2011-11-09 12:07:14 +0000 | [diff] [blame] | 2906 | [NEIGH_VAR_RETRANS_TIME_MS] = { |
Eric W. Biederman | d12af67 | 2007-10-18 03:05:25 -0700 | [diff] [blame] | 2907 | .procname = "retrans_time_ms", |
| 2908 | .maxlen = sizeof(int), |
| 2909 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 2910 | .proc_handler = proc_dointvec_ms_jiffies, |
Eric W. Biederman | d12af67 | 2007-10-18 03:05:25 -0700 | [diff] [blame] | 2911 | }, |
Eric Dumazet | 8b5c171 | 2011-11-09 12:07:14 +0000 | [diff] [blame] | 2912 | [NEIGH_VAR_BASE_REACHABLE_TIME_MS] = { |
Eric W. Biederman | d12af67 | 2007-10-18 03:05:25 -0700 | [diff] [blame] | 2913 | .procname = "base_reachable_time_ms", |
| 2914 | .maxlen = sizeof(int), |
| 2915 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 2916 | .proc_handler = proc_dointvec_ms_jiffies, |
Eric W. Biederman | d12af67 | 2007-10-18 03:05:25 -0700 | [diff] [blame] | 2917 | }, |
Eric Dumazet | 8b5c171 | 2011-11-09 12:07:14 +0000 | [diff] [blame] | 2918 | [NEIGH_VAR_GC_INTERVAL] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2919 | .procname = "gc_interval", |
| 2920 | .maxlen = sizeof(int), |
| 2921 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 2922 | .proc_handler = proc_dointvec_jiffies, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2923 | }, |
Eric Dumazet | 8b5c171 | 2011-11-09 12:07:14 +0000 | [diff] [blame] | 2924 | [NEIGH_VAR_GC_THRESH1] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2925 | .procname = "gc_thresh1", |
| 2926 | .maxlen = sizeof(int), |
| 2927 | .mode = 0644, |
Francesco Fusco | 555445c | 2013-07-24 10:39:06 +0200 | [diff] [blame] | 2928 | .extra1 = &zero, |
| 2929 | .extra2 = &int_max, |
| 2930 | .proc_handler = proc_dointvec_minmax, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2931 | }, |
Eric Dumazet | 8b5c171 | 2011-11-09 12:07:14 +0000 | [diff] [blame] | 2932 | [NEIGH_VAR_GC_THRESH2] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2933 | .procname = "gc_thresh2", |
| 2934 | .maxlen = sizeof(int), |
| 2935 | .mode = 0644, |
Francesco Fusco | 555445c | 2013-07-24 10:39:06 +0200 | [diff] [blame] | 2936 | .extra1 = &zero, |
| 2937 | .extra2 = &int_max, |
| 2938 | .proc_handler = proc_dointvec_minmax, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2939 | }, |
Eric Dumazet | 8b5c171 | 2011-11-09 12:07:14 +0000 | [diff] [blame] | 2940 | [NEIGH_VAR_GC_THRESH3] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2941 | .procname = "gc_thresh3", |
| 2942 | .maxlen = sizeof(int), |
| 2943 | .mode = 0644, |
Francesco Fusco | 555445c | 2013-07-24 10:39:06 +0200 | [diff] [blame] | 2944 | .extra1 = &zero, |
| 2945 | .extra2 = &int_max, |
| 2946 | .proc_handler = proc_dointvec_minmax, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2947 | }, |
Pavel Emelyanov | c3bac5a | 2007-12-02 00:08:16 +1100 | [diff] [blame] | 2948 | {}, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2949 | }, |
| 2950 | }; |
| 2951 | |
| 2952 | int neigh_sysctl_register(struct net_device *dev, struct neigh_parms *p, |
Eric W. Biederman | 54716e3 | 2010-02-14 03:27:03 +0000 | [diff] [blame] | 2953 | char *p_name, proc_handler *handler) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2954 | { |
Pavel Emelyanov | 3c607bb | 2007-12-02 00:06:34 +1100 | [diff] [blame] | 2955 | struct neigh_sysctl_table *t; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2956 | const char *dev_name_source = NULL; |
Eric W. Biederman | 8f40a1f | 2012-04-19 13:38:03 +0000 | [diff] [blame] | 2957 | char neigh_path[ sizeof("net//neigh/") + IFNAMSIZ + IFNAMSIZ ]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2958 | |
Pavel Emelyanov | 3c607bb | 2007-12-02 00:06:34 +1100 | [diff] [blame] | 2959 | t = kmemdup(&neigh_sysctl_template, sizeof(*t), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2960 | if (!t) |
Pavel Emelyanov | 3c607bb | 2007-12-02 00:06:34 +1100 | [diff] [blame] | 2961 | goto err; |
| 2962 | |
Eric Dumazet | 8b5c171 | 2011-11-09 12:07:14 +0000 | [diff] [blame] | 2963 | t->neigh_vars[NEIGH_VAR_MCAST_PROBE].data = &p->mcast_probes; |
| 2964 | t->neigh_vars[NEIGH_VAR_UCAST_PROBE].data = &p->ucast_probes; |
| 2965 | t->neigh_vars[NEIGH_VAR_APP_PROBE].data = &p->app_probes; |
| 2966 | t->neigh_vars[NEIGH_VAR_RETRANS_TIME].data = &p->retrans_time; |
| 2967 | t->neigh_vars[NEIGH_VAR_BASE_REACHABLE_TIME].data = &p->base_reachable_time; |
| 2968 | t->neigh_vars[NEIGH_VAR_DELAY_PROBE_TIME].data = &p->delay_probe_time; |
| 2969 | t->neigh_vars[NEIGH_VAR_GC_STALETIME].data = &p->gc_staletime; |
| 2970 | t->neigh_vars[NEIGH_VAR_QUEUE_LEN].data = &p->queue_len_bytes; |
| 2971 | t->neigh_vars[NEIGH_VAR_QUEUE_LEN_BYTES].data = &p->queue_len_bytes; |
| 2972 | t->neigh_vars[NEIGH_VAR_PROXY_QLEN].data = &p->proxy_qlen; |
| 2973 | t->neigh_vars[NEIGH_VAR_ANYCAST_DELAY].data = &p->anycast_delay; |
| 2974 | t->neigh_vars[NEIGH_VAR_PROXY_DELAY].data = &p->proxy_delay; |
| 2975 | t->neigh_vars[NEIGH_VAR_LOCKTIME].data = &p->locktime; |
| 2976 | t->neigh_vars[NEIGH_VAR_RETRANS_TIME_MS].data = &p->retrans_time; |
| 2977 | t->neigh_vars[NEIGH_VAR_BASE_REACHABLE_TIME_MS].data = &p->base_reachable_time; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2978 | |
| 2979 | if (dev) { |
| 2980 | dev_name_source = dev->name; |
Eric W. Biederman | d12af67 | 2007-10-18 03:05:25 -0700 | [diff] [blame] | 2981 | /* Terminate the table early */ |
Eric Dumazet | 8b5c171 | 2011-11-09 12:07:14 +0000 | [diff] [blame] | 2982 | memset(&t->neigh_vars[NEIGH_VAR_GC_INTERVAL], 0, |
| 2983 | sizeof(t->neigh_vars[NEIGH_VAR_GC_INTERVAL])); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2984 | } else { |
Eric W. Biederman | 8f40a1f | 2012-04-19 13:38:03 +0000 | [diff] [blame] | 2985 | dev_name_source = "default"; |
Eric Dumazet | 8b5c171 | 2011-11-09 12:07:14 +0000 | [diff] [blame] | 2986 | t->neigh_vars[NEIGH_VAR_GC_INTERVAL].data = (int *)(p + 1); |
| 2987 | t->neigh_vars[NEIGH_VAR_GC_THRESH1].data = (int *)(p + 1) + 1; |
| 2988 | t->neigh_vars[NEIGH_VAR_GC_THRESH2].data = (int *)(p + 1) + 2; |
| 2989 | t->neigh_vars[NEIGH_VAR_GC_THRESH3].data = (int *)(p + 1) + 3; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2990 | } |
| 2991 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2992 | |
Eric W. Biederman | f8572d8 | 2009-11-05 13:32:03 -0800 | [diff] [blame] | 2993 | if (handler) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2994 | /* RetransTime */ |
Eric Dumazet | 8b5c171 | 2011-11-09 12:07:14 +0000 | [diff] [blame] | 2995 | t->neigh_vars[NEIGH_VAR_RETRANS_TIME].proc_handler = handler; |
| 2996 | t->neigh_vars[NEIGH_VAR_RETRANS_TIME].extra1 = dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2997 | /* ReachableTime */ |
Eric Dumazet | 8b5c171 | 2011-11-09 12:07:14 +0000 | [diff] [blame] | 2998 | t->neigh_vars[NEIGH_VAR_BASE_REACHABLE_TIME].proc_handler = handler; |
| 2999 | t->neigh_vars[NEIGH_VAR_BASE_REACHABLE_TIME].extra1 = dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3000 | /* RetransTime (in milliseconds)*/ |
Eric Dumazet | 8b5c171 | 2011-11-09 12:07:14 +0000 | [diff] [blame] | 3001 | t->neigh_vars[NEIGH_VAR_RETRANS_TIME_MS].proc_handler = handler; |
| 3002 | t->neigh_vars[NEIGH_VAR_RETRANS_TIME_MS].extra1 = dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3003 | /* ReachableTime (in milliseconds) */ |
Eric Dumazet | 8b5c171 | 2011-11-09 12:07:14 +0000 | [diff] [blame] | 3004 | t->neigh_vars[NEIGH_VAR_BASE_REACHABLE_TIME_MS].proc_handler = handler; |
| 3005 | t->neigh_vars[NEIGH_VAR_BASE_REACHABLE_TIME_MS].extra1 = dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3006 | } |
| 3007 | |
Eric W. Biederman | 464dc80 | 2012-11-16 03:02:59 +0000 | [diff] [blame] | 3008 | /* Don't export sysctls to unprivileged users */ |
| 3009 | if (neigh_parms_net(p)->user_ns != &init_user_ns) |
| 3010 | t->neigh_vars[0].procname = NULL; |
| 3011 | |
Eric W. Biederman | 8f40a1f | 2012-04-19 13:38:03 +0000 | [diff] [blame] | 3012 | snprintf(neigh_path, sizeof(neigh_path), "net/%s/neigh/%s", |
| 3013 | p_name, dev_name_source); |
Denis V. Lunev | 4ab438f | 2008-02-28 20:48:01 -0800 | [diff] [blame] | 3014 | t->sysctl_header = |
Eric W. Biederman | 8f40a1f | 2012-04-19 13:38:03 +0000 | [diff] [blame] | 3015 | register_net_sysctl(neigh_parms_net(p), neigh_path, t->neigh_vars); |
Pavel Emelyanov | 3c607bb | 2007-12-02 00:06:34 +1100 | [diff] [blame] | 3016 | if (!t->sysctl_header) |
Eric W. Biederman | 8f40a1f | 2012-04-19 13:38:03 +0000 | [diff] [blame] | 3017 | goto free; |
Pavel Emelyanov | 3c607bb | 2007-12-02 00:06:34 +1100 | [diff] [blame] | 3018 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3019 | p->sysctl_table = t; |
| 3020 | return 0; |
| 3021 | |
Pavel Emelyanov | 3c607bb | 2007-12-02 00:06:34 +1100 | [diff] [blame] | 3022 | free: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3023 | kfree(t); |
Pavel Emelyanov | 3c607bb | 2007-12-02 00:06:34 +1100 | [diff] [blame] | 3024 | err: |
| 3025 | return -ENOBUFS; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3026 | } |
YOSHIFUJI Hideaki | 0a20450 | 2008-03-24 18:39:10 +0900 | [diff] [blame] | 3027 | EXPORT_SYMBOL(neigh_sysctl_register); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3028 | |
| 3029 | void neigh_sysctl_unregister(struct neigh_parms *p) |
| 3030 | { |
| 3031 | if (p->sysctl_table) { |
| 3032 | struct neigh_sysctl_table *t = p->sysctl_table; |
| 3033 | p->sysctl_table = NULL; |
Eric W. Biederman | 5dd3df1 | 2012-04-19 13:24:33 +0000 | [diff] [blame] | 3034 | unregister_net_sysctl_table(t->sysctl_header); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3035 | kfree(t); |
| 3036 | } |
| 3037 | } |
YOSHIFUJI Hideaki | 0a20450 | 2008-03-24 18:39:10 +0900 | [diff] [blame] | 3038 | EXPORT_SYMBOL(neigh_sysctl_unregister); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3039 | |
| 3040 | #endif /* CONFIG_SYSCTL */ |
| 3041 | |
Thomas Graf | c8822a4 | 2007-03-22 11:50:06 -0700 | [diff] [blame] | 3042 | static int __init neigh_init(void) |
| 3043 | { |
Greg Rose | c7ac867 | 2011-06-10 01:27:09 +0000 | [diff] [blame] | 3044 | rtnl_register(PF_UNSPEC, RTM_NEWNEIGH, neigh_add, NULL, NULL); |
| 3045 | rtnl_register(PF_UNSPEC, RTM_DELNEIGH, neigh_delete, NULL, NULL); |
| 3046 | rtnl_register(PF_UNSPEC, RTM_GETNEIGH, NULL, neigh_dump_info, NULL); |
Thomas Graf | c8822a4 | 2007-03-22 11:50:06 -0700 | [diff] [blame] | 3047 | |
Greg Rose | c7ac867 | 2011-06-10 01:27:09 +0000 | [diff] [blame] | 3048 | rtnl_register(PF_UNSPEC, RTM_GETNEIGHTBL, NULL, neightbl_dump_info, |
| 3049 | NULL); |
| 3050 | rtnl_register(PF_UNSPEC, RTM_SETNEIGHTBL, neightbl_set, NULL, NULL); |
Thomas Graf | c8822a4 | 2007-03-22 11:50:06 -0700 | [diff] [blame] | 3051 | |
| 3052 | return 0; |
| 3053 | } |
| 3054 | |
| 3055 | subsys_initcall(neigh_init); |
| 3056 | |