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> |
Jiri Pirko | 1d4c8c2 | 2013-12-07 19:26:56 +0100 | [diff] [blame] | 41 | #include <linux/inetdevice.h> |
Jiri Pirko | bba2489 | 2013-12-07 19:26:57 +0100 | [diff] [blame] | 42 | #include <net/addrconf.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | |
Joe Perches | d5d427c | 2013-04-15 15:17:19 +0000 | [diff] [blame] | 44 | #define DEBUG |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | #define NEIGH_DEBUG 1 |
Joe Perches | d5d427c | 2013-04-15 15:17:19 +0000 | [diff] [blame] | 46 | #define neigh_dbg(level, fmt, ...) \ |
| 47 | do { \ |
| 48 | if (level <= NEIGH_DEBUG) \ |
| 49 | pr_debug(fmt, ##__VA_ARGS__); \ |
| 50 | } while (0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | |
| 52 | #define PNEIGH_HASHMASK 0xF |
| 53 | |
| 54 | static void neigh_timer_handler(unsigned long arg); |
Thomas Graf | d961db3 | 2007-08-08 23:12:56 -0700 | [diff] [blame] | 55 | static void __neigh_notify(struct neighbour *n, int type, int flags); |
| 56 | static void neigh_update_notify(struct neighbour *neigh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | static int pneigh_ifdown(struct neigh_table *tbl, struct net_device *dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | |
| 59 | static struct neigh_table *neigh_tables; |
Amos Waterland | 45fc3b1 | 2005-09-24 16:53:16 -0700 | [diff] [blame] | 60 | #ifdef CONFIG_PROC_FS |
Arjan van de Ven | 9a32144 | 2007-02-12 00:55:35 -0800 | [diff] [blame] | 61 | static const struct file_operations neigh_stat_seq_fops; |
Amos Waterland | 45fc3b1 | 2005-09-24 16:53:16 -0700 | [diff] [blame] | 62 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 63 | |
| 64 | /* |
| 65 | Neighbour hash table buckets are protected with rwlock tbl->lock. |
| 66 | |
| 67 | - All the scans/updates to hash buckets MUST be made under this lock. |
| 68 | - NOTHING clever should be made under this lock: no callbacks |
| 69 | to protocol backends, no attempts to send something to network. |
| 70 | It will result in deadlocks, if backend/driver wants to use neighbour |
| 71 | cache. |
| 72 | - If the entry requires some non-trivial actions, increase |
| 73 | its reference count and release table lock. |
| 74 | |
| 75 | Neighbour entries are protected: |
| 76 | - with reference count. |
| 77 | - with rwlock neigh->lock |
| 78 | |
| 79 | Reference count prevents destruction. |
| 80 | |
| 81 | neigh->lock mainly serializes ll address data and its validity state. |
| 82 | However, the same lock is used to protect another entry fields: |
| 83 | - timer |
| 84 | - resolution queue |
| 85 | |
| 86 | Again, nothing clever shall be made under neigh->lock, |
| 87 | the most complicated procedure, which we allow is dev->hard_header. |
| 88 | It is supposed, that dev->hard_header is simplistic and does |
| 89 | not make callbacks to neighbour tables. |
| 90 | |
| 91 | The last lock is neigh_tbl_lock. It is pure SMP lock, protecting |
| 92 | list of neighbour tables. This list is used only in process context, |
| 93 | */ |
| 94 | |
| 95 | static DEFINE_RWLOCK(neigh_tbl_lock); |
| 96 | |
David S. Miller | 8f40b16 | 2011-07-17 13:34:11 -0700 | [diff] [blame] | 97 | static int neigh_blackhole(struct neighbour *neigh, struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | { |
| 99 | kfree_skb(skb); |
| 100 | return -ENETDOWN; |
| 101 | } |
| 102 | |
Thomas Graf | 4f49455 | 2007-08-08 23:12:36 -0700 | [diff] [blame] | 103 | static void neigh_cleanup_and_release(struct neighbour *neigh) |
| 104 | { |
| 105 | if (neigh->parms->neigh_cleanup) |
| 106 | neigh->parms->neigh_cleanup(neigh); |
| 107 | |
Thomas Graf | d961db3 | 2007-08-08 23:12:56 -0700 | [diff] [blame] | 108 | __neigh_notify(neigh, RTM_DELNEIGH, 0); |
Thomas Graf | 4f49455 | 2007-08-08 23:12:36 -0700 | [diff] [blame] | 109 | neigh_release(neigh); |
| 110 | } |
| 111 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | /* |
| 113 | * It is random distribution in the interval (1/2)*base...(3/2)*base. |
| 114 | * It corresponds to default IPv6 settings and is not overridable, |
| 115 | * because it is really reasonable choice. |
| 116 | */ |
| 117 | |
| 118 | unsigned long neigh_rand_reach_time(unsigned long base) |
| 119 | { |
Aruna-Hewapathirane | 63862b5 | 2014-01-11 07:15:59 -0500 | [diff] [blame] | 120 | return base ? (prandom_u32() % base) + (base >> 1) : 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 121 | } |
YOSHIFUJI Hideaki | 0a20450 | 2008-03-24 18:39:10 +0900 | [diff] [blame] | 122 | EXPORT_SYMBOL(neigh_rand_reach_time); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 123 | |
| 124 | |
| 125 | static int neigh_forced_gc(struct neigh_table *tbl) |
| 126 | { |
| 127 | int shrunk = 0; |
| 128 | int i; |
Eric Dumazet | d6bf781 | 2010-10-04 06:15:44 +0000 | [diff] [blame] | 129 | struct neigh_hash_table *nht; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 130 | |
| 131 | NEIGH_CACHE_STAT_INC(tbl, forced_gc_runs); |
| 132 | |
| 133 | write_lock_bh(&tbl->lock); |
Eric Dumazet | d6bf781 | 2010-10-04 06:15:44 +0000 | [diff] [blame] | 134 | nht = rcu_dereference_protected(tbl->nht, |
| 135 | lockdep_is_held(&tbl->lock)); |
David S. Miller | cd08933 | 2011-07-11 01:28:12 -0700 | [diff] [blame] | 136 | for (i = 0; i < (1 << nht->hash_shift); i++) { |
Eric Dumazet | 767e97e | 2010-10-06 17:49:21 -0700 | [diff] [blame] | 137 | struct neighbour *n; |
| 138 | struct neighbour __rcu **np; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 139 | |
Eric Dumazet | d6bf781 | 2010-10-04 06:15:44 +0000 | [diff] [blame] | 140 | np = &nht->hash_buckets[i]; |
Eric Dumazet | 767e97e | 2010-10-06 17:49:21 -0700 | [diff] [blame] | 141 | while ((n = rcu_dereference_protected(*np, |
| 142 | lockdep_is_held(&tbl->lock))) != NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 143 | /* Neighbour record may be discarded if: |
| 144 | * - nobody refers to it. |
| 145 | * - it is not permanent |
| 146 | */ |
| 147 | write_lock(&n->lock); |
| 148 | if (atomic_read(&n->refcnt) == 1 && |
| 149 | !(n->nud_state & NUD_PERMANENT)) { |
Eric Dumazet | 767e97e | 2010-10-06 17:49:21 -0700 | [diff] [blame] | 150 | rcu_assign_pointer(*np, |
| 151 | rcu_dereference_protected(n->next, |
| 152 | lockdep_is_held(&tbl->lock))); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 153 | n->dead = 1; |
| 154 | shrunk = 1; |
| 155 | write_unlock(&n->lock); |
Thomas Graf | 4f49455 | 2007-08-08 23:12:36 -0700 | [diff] [blame] | 156 | neigh_cleanup_and_release(n); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 157 | continue; |
| 158 | } |
| 159 | write_unlock(&n->lock); |
| 160 | np = &n->next; |
| 161 | } |
| 162 | } |
| 163 | |
| 164 | tbl->last_flush = jiffies; |
| 165 | |
| 166 | write_unlock_bh(&tbl->lock); |
| 167 | |
| 168 | return shrunk; |
| 169 | } |
| 170 | |
Pavel Emelyanov | a43d899 | 2007-12-20 15:49:05 -0800 | [diff] [blame] | 171 | static void neigh_add_timer(struct neighbour *n, unsigned long when) |
| 172 | { |
| 173 | neigh_hold(n); |
| 174 | if (unlikely(mod_timer(&n->timer, when))) { |
| 175 | printk("NEIGH: BUG, double timer add, state is %x\n", |
| 176 | n->nud_state); |
| 177 | dump_stack(); |
| 178 | } |
| 179 | } |
| 180 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 181 | static int neigh_del_timer(struct neighbour *n) |
| 182 | { |
| 183 | if ((n->nud_state & NUD_IN_TIMER) && |
| 184 | del_timer(&n->timer)) { |
| 185 | neigh_release(n); |
| 186 | return 1; |
| 187 | } |
| 188 | return 0; |
| 189 | } |
| 190 | |
| 191 | static void pneigh_queue_purge(struct sk_buff_head *list) |
| 192 | { |
| 193 | struct sk_buff *skb; |
| 194 | |
| 195 | while ((skb = skb_dequeue(list)) != NULL) { |
| 196 | dev_put(skb->dev); |
| 197 | kfree_skb(skb); |
| 198 | } |
| 199 | } |
| 200 | |
Herbert Xu | 49636bb | 2005-10-23 17:18:00 +1000 | [diff] [blame] | 201 | 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] | 202 | { |
| 203 | int i; |
Eric Dumazet | d6bf781 | 2010-10-04 06:15:44 +0000 | [diff] [blame] | 204 | struct neigh_hash_table *nht; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 205 | |
Eric Dumazet | d6bf781 | 2010-10-04 06:15:44 +0000 | [diff] [blame] | 206 | nht = rcu_dereference_protected(tbl->nht, |
| 207 | lockdep_is_held(&tbl->lock)); |
| 208 | |
David S. Miller | cd08933 | 2011-07-11 01:28:12 -0700 | [diff] [blame] | 209 | for (i = 0; i < (1 << nht->hash_shift); i++) { |
Eric Dumazet | 767e97e | 2010-10-06 17:49:21 -0700 | [diff] [blame] | 210 | struct neighbour *n; |
| 211 | struct neighbour __rcu **np = &nht->hash_buckets[i]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 212 | |
Eric Dumazet | 767e97e | 2010-10-06 17:49:21 -0700 | [diff] [blame] | 213 | while ((n = rcu_dereference_protected(*np, |
| 214 | lockdep_is_held(&tbl->lock))) != NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 215 | if (dev && n->dev != dev) { |
| 216 | np = &n->next; |
| 217 | continue; |
| 218 | } |
Eric Dumazet | 767e97e | 2010-10-06 17:49:21 -0700 | [diff] [blame] | 219 | rcu_assign_pointer(*np, |
| 220 | rcu_dereference_protected(n->next, |
| 221 | lockdep_is_held(&tbl->lock))); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 222 | write_lock(&n->lock); |
| 223 | neigh_del_timer(n); |
| 224 | n->dead = 1; |
| 225 | |
| 226 | if (atomic_read(&n->refcnt) != 1) { |
| 227 | /* The most unpleasant situation. |
| 228 | We must destroy neighbour entry, |
| 229 | but someone still uses it. |
| 230 | |
| 231 | The destroy will be delayed until |
| 232 | the last user releases us, but |
| 233 | we must kill timers etc. and move |
| 234 | it to safe state. |
| 235 | */ |
Eric Dumazet | c9ab4d8 | 2013-06-28 02:37:42 -0700 | [diff] [blame] | 236 | __skb_queue_purge(&n->arp_queue); |
Eric Dumazet | 8b5c171 | 2011-11-09 12:07:14 +0000 | [diff] [blame] | 237 | n->arp_queue_len_bytes = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 238 | n->output = neigh_blackhole; |
| 239 | if (n->nud_state & NUD_VALID) |
| 240 | n->nud_state = NUD_NOARP; |
| 241 | else |
| 242 | n->nud_state = NUD_NONE; |
Joe Perches | d5d427c | 2013-04-15 15:17:19 +0000 | [diff] [blame] | 243 | neigh_dbg(2, "neigh %p is stray\n", n); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 244 | } |
| 245 | write_unlock(&n->lock); |
Thomas Graf | 4f49455 | 2007-08-08 23:12:36 -0700 | [diff] [blame] | 246 | neigh_cleanup_and_release(n); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 247 | } |
| 248 | } |
Herbert Xu | 49636bb | 2005-10-23 17:18:00 +1000 | [diff] [blame] | 249 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 250 | |
Herbert Xu | 49636bb | 2005-10-23 17:18:00 +1000 | [diff] [blame] | 251 | void neigh_changeaddr(struct neigh_table *tbl, struct net_device *dev) |
| 252 | { |
| 253 | write_lock_bh(&tbl->lock); |
| 254 | neigh_flush_dev(tbl, dev); |
| 255 | write_unlock_bh(&tbl->lock); |
| 256 | } |
YOSHIFUJI Hideaki | 0a20450 | 2008-03-24 18:39:10 +0900 | [diff] [blame] | 257 | EXPORT_SYMBOL(neigh_changeaddr); |
Herbert Xu | 49636bb | 2005-10-23 17:18:00 +1000 | [diff] [blame] | 258 | |
| 259 | int neigh_ifdown(struct neigh_table *tbl, struct net_device *dev) |
| 260 | { |
| 261 | write_lock_bh(&tbl->lock); |
| 262 | neigh_flush_dev(tbl, dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 263 | pneigh_ifdown(tbl, dev); |
| 264 | write_unlock_bh(&tbl->lock); |
| 265 | |
| 266 | del_timer_sync(&tbl->proxy_timer); |
| 267 | pneigh_queue_purge(&tbl->proxy_queue); |
| 268 | return 0; |
| 269 | } |
YOSHIFUJI Hideaki | 0a20450 | 2008-03-24 18:39:10 +0900 | [diff] [blame] | 270 | EXPORT_SYMBOL(neigh_ifdown); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 271 | |
David Miller | 596b9b6 | 2011-07-25 00:01:25 +0000 | [diff] [blame] | 272 | 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] | 273 | { |
| 274 | struct neighbour *n = NULL; |
| 275 | unsigned long now = jiffies; |
| 276 | int entries; |
| 277 | |
| 278 | entries = atomic_inc_return(&tbl->entries) - 1; |
| 279 | if (entries >= tbl->gc_thresh3 || |
| 280 | (entries >= tbl->gc_thresh2 && |
| 281 | time_after(now, tbl->last_flush + 5 * HZ))) { |
| 282 | if (!neigh_forced_gc(tbl) && |
| 283 | entries >= tbl->gc_thresh3) |
| 284 | goto out_entries; |
| 285 | } |
| 286 | |
YOSHIFUJI Hideaki / 吉藤英明 | 08433ef | 2013-01-24 00:44:23 +0000 | [diff] [blame] | 287 | n = kzalloc(tbl->entry_size + dev->neigh_priv_len, GFP_ATOMIC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 288 | if (!n) |
| 289 | goto out_entries; |
| 290 | |
Eric Dumazet | c9ab4d8 | 2013-06-28 02:37:42 -0700 | [diff] [blame] | 291 | __skb_queue_head_init(&n->arp_queue); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 292 | rwlock_init(&n->lock); |
Eric Dumazet | 0ed8ddf | 2010-10-07 10:44:07 +0000 | [diff] [blame] | 293 | seqlock_init(&n->ha_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 294 | n->updated = n->used = now; |
| 295 | n->nud_state = NUD_NONE; |
| 296 | n->output = neigh_blackhole; |
David S. Miller | f6b72b6 | 2011-07-14 07:53:20 -0700 | [diff] [blame] | 297 | seqlock_init(&n->hh.hh_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 298 | n->parms = neigh_parms_clone(&tbl->parms); |
Pavel Emelyanov | b24b8a2 | 2008-01-23 21:20:07 -0800 | [diff] [blame] | 299 | setup_timer(&n->timer, neigh_timer_handler, (unsigned long)n); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 300 | |
| 301 | NEIGH_CACHE_STAT_INC(tbl, allocs); |
| 302 | n->tbl = tbl; |
| 303 | atomic_set(&n->refcnt, 1); |
| 304 | n->dead = 1; |
| 305 | out: |
| 306 | return n; |
| 307 | |
| 308 | out_entries: |
| 309 | atomic_dec(&tbl->entries); |
| 310 | goto out; |
| 311 | } |
| 312 | |
David S. Miller | 2c2aba6 | 2011-12-28 15:06:58 -0500 | [diff] [blame] | 313 | static void neigh_get_hash_rnd(u32 *x) |
| 314 | { |
| 315 | get_random_bytes(x, sizeof(*x)); |
| 316 | *x |= 1; |
| 317 | } |
| 318 | |
David S. Miller | cd08933 | 2011-07-11 01:28:12 -0700 | [diff] [blame] | 319 | static struct neigh_hash_table *neigh_hash_alloc(unsigned int shift) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 320 | { |
David S. Miller | cd08933 | 2011-07-11 01:28:12 -0700 | [diff] [blame] | 321 | size_t size = (1 << shift) * sizeof(struct neighbour *); |
Eric Dumazet | d6bf781 | 2010-10-04 06:15:44 +0000 | [diff] [blame] | 322 | struct neigh_hash_table *ret; |
Eric Dumazet | 6193d2b | 2011-01-19 22:02:47 +0000 | [diff] [blame] | 323 | struct neighbour __rcu **buckets; |
David S. Miller | 2c2aba6 | 2011-12-28 15:06:58 -0500 | [diff] [blame] | 324 | int i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 325 | |
Eric Dumazet | d6bf781 | 2010-10-04 06:15:44 +0000 | [diff] [blame] | 326 | ret = kmalloc(sizeof(*ret), GFP_ATOMIC); |
| 327 | if (!ret) |
| 328 | return NULL; |
| 329 | if (size <= PAGE_SIZE) |
| 330 | buckets = kzalloc(size, GFP_ATOMIC); |
| 331 | else |
Eric Dumazet | 6193d2b | 2011-01-19 22:02:47 +0000 | [diff] [blame] | 332 | buckets = (struct neighbour __rcu **) |
Eric Dumazet | d6bf781 | 2010-10-04 06:15:44 +0000 | [diff] [blame] | 333 | __get_free_pages(GFP_ATOMIC | __GFP_ZERO, |
| 334 | get_order(size)); |
| 335 | if (!buckets) { |
| 336 | kfree(ret); |
| 337 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 338 | } |
Eric Dumazet | 6193d2b | 2011-01-19 22:02:47 +0000 | [diff] [blame] | 339 | ret->hash_buckets = buckets; |
David S. Miller | cd08933 | 2011-07-11 01:28:12 -0700 | [diff] [blame] | 340 | ret->hash_shift = shift; |
David S. Miller | 2c2aba6 | 2011-12-28 15:06:58 -0500 | [diff] [blame] | 341 | for (i = 0; i < NEIGH_NUM_HASH_RND; i++) |
| 342 | neigh_get_hash_rnd(&ret->hash_rnd[i]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 343 | return ret; |
| 344 | } |
| 345 | |
Eric Dumazet | d6bf781 | 2010-10-04 06:15:44 +0000 | [diff] [blame] | 346 | static void neigh_hash_free_rcu(struct rcu_head *head) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 347 | { |
Eric Dumazet | d6bf781 | 2010-10-04 06:15:44 +0000 | [diff] [blame] | 348 | struct neigh_hash_table *nht = container_of(head, |
| 349 | struct neigh_hash_table, |
| 350 | rcu); |
David S. Miller | cd08933 | 2011-07-11 01:28:12 -0700 | [diff] [blame] | 351 | size_t size = (1 << nht->hash_shift) * sizeof(struct neighbour *); |
Eric Dumazet | 6193d2b | 2011-01-19 22:02:47 +0000 | [diff] [blame] | 352 | struct neighbour __rcu **buckets = nht->hash_buckets; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 353 | |
| 354 | if (size <= PAGE_SIZE) |
Eric Dumazet | d6bf781 | 2010-10-04 06:15:44 +0000 | [diff] [blame] | 355 | kfree(buckets); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 356 | else |
Eric Dumazet | d6bf781 | 2010-10-04 06:15:44 +0000 | [diff] [blame] | 357 | free_pages((unsigned long)buckets, get_order(size)); |
| 358 | kfree(nht); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 359 | } |
| 360 | |
Eric Dumazet | d6bf781 | 2010-10-04 06:15:44 +0000 | [diff] [blame] | 361 | 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] | 362 | unsigned long new_shift) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 363 | { |
Eric Dumazet | d6bf781 | 2010-10-04 06:15:44 +0000 | [diff] [blame] | 364 | unsigned int i, hash; |
| 365 | struct neigh_hash_table *new_nht, *old_nht; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 366 | |
| 367 | NEIGH_CACHE_STAT_INC(tbl, hash_grows); |
| 368 | |
Eric Dumazet | d6bf781 | 2010-10-04 06:15:44 +0000 | [diff] [blame] | 369 | old_nht = rcu_dereference_protected(tbl->nht, |
| 370 | lockdep_is_held(&tbl->lock)); |
David S. Miller | cd08933 | 2011-07-11 01:28:12 -0700 | [diff] [blame] | 371 | new_nht = neigh_hash_alloc(new_shift); |
Eric Dumazet | d6bf781 | 2010-10-04 06:15:44 +0000 | [diff] [blame] | 372 | if (!new_nht) |
| 373 | return old_nht; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 374 | |
David S. Miller | cd08933 | 2011-07-11 01:28:12 -0700 | [diff] [blame] | 375 | for (i = 0; i < (1 << old_nht->hash_shift); i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 376 | struct neighbour *n, *next; |
| 377 | |
Eric Dumazet | 767e97e | 2010-10-06 17:49:21 -0700 | [diff] [blame] | 378 | for (n = rcu_dereference_protected(old_nht->hash_buckets[i], |
| 379 | lockdep_is_held(&tbl->lock)); |
Eric Dumazet | d6bf781 | 2010-10-04 06:15:44 +0000 | [diff] [blame] | 380 | n != NULL; |
| 381 | n = next) { |
| 382 | hash = tbl->hash(n->primary_key, n->dev, |
| 383 | new_nht->hash_rnd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 384 | |
David S. Miller | cd08933 | 2011-07-11 01:28:12 -0700 | [diff] [blame] | 385 | hash >>= (32 - new_nht->hash_shift); |
Eric Dumazet | 767e97e | 2010-10-06 17:49:21 -0700 | [diff] [blame] | 386 | next = rcu_dereference_protected(n->next, |
| 387 | lockdep_is_held(&tbl->lock)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 388 | |
Eric Dumazet | 767e97e | 2010-10-06 17:49:21 -0700 | [diff] [blame] | 389 | rcu_assign_pointer(n->next, |
| 390 | rcu_dereference_protected( |
| 391 | new_nht->hash_buckets[hash], |
| 392 | lockdep_is_held(&tbl->lock))); |
| 393 | rcu_assign_pointer(new_nht->hash_buckets[hash], n); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 394 | } |
| 395 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 396 | |
Eric Dumazet | d6bf781 | 2010-10-04 06:15:44 +0000 | [diff] [blame] | 397 | rcu_assign_pointer(tbl->nht, new_nht); |
| 398 | call_rcu(&old_nht->rcu, neigh_hash_free_rcu); |
| 399 | return new_nht; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 400 | } |
| 401 | |
| 402 | struct neighbour *neigh_lookup(struct neigh_table *tbl, const void *pkey, |
| 403 | struct net_device *dev) |
| 404 | { |
| 405 | struct neighbour *n; |
| 406 | int key_len = tbl->key_len; |
Pavel Emelyanov | bc4bf5f | 2008-02-23 19:57:02 -0800 | [diff] [blame] | 407 | u32 hash_val; |
Eric Dumazet | d6bf781 | 2010-10-04 06:15:44 +0000 | [diff] [blame] | 408 | struct neigh_hash_table *nht; |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 409 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 410 | NEIGH_CACHE_STAT_INC(tbl, lookups); |
| 411 | |
Eric Dumazet | d6bf781 | 2010-10-04 06:15:44 +0000 | [diff] [blame] | 412 | rcu_read_lock_bh(); |
| 413 | nht = rcu_dereference_bh(tbl->nht); |
David S. Miller | cd08933 | 2011-07-11 01:28:12 -0700 | [diff] [blame] | 414 | 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] | 415 | |
| 416 | for (n = rcu_dereference_bh(nht->hash_buckets[hash_val]); |
| 417 | n != NULL; |
| 418 | n = rcu_dereference_bh(n->next)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 419 | if (dev == n->dev && !memcmp(n->primary_key, pkey, key_len)) { |
Eric Dumazet | 767e97e | 2010-10-06 17:49:21 -0700 | [diff] [blame] | 420 | if (!atomic_inc_not_zero(&n->refcnt)) |
| 421 | n = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 422 | NEIGH_CACHE_STAT_INC(tbl, hits); |
| 423 | break; |
| 424 | } |
| 425 | } |
Eric Dumazet | 767e97e | 2010-10-06 17:49:21 -0700 | [diff] [blame] | 426 | |
Eric Dumazet | d6bf781 | 2010-10-04 06:15:44 +0000 | [diff] [blame] | 427 | rcu_read_unlock_bh(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 428 | return n; |
| 429 | } |
YOSHIFUJI Hideaki | 0a20450 | 2008-03-24 18:39:10 +0900 | [diff] [blame] | 430 | EXPORT_SYMBOL(neigh_lookup); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 431 | |
Eric W. Biederman | 426b530 | 2008-01-24 00:13:18 -0800 | [diff] [blame] | 432 | struct neighbour *neigh_lookup_nodev(struct neigh_table *tbl, struct net *net, |
| 433 | const void *pkey) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 434 | { |
| 435 | struct neighbour *n; |
| 436 | int key_len = tbl->key_len; |
Pavel Emelyanov | bc4bf5f | 2008-02-23 19:57:02 -0800 | [diff] [blame] | 437 | u32 hash_val; |
Eric Dumazet | d6bf781 | 2010-10-04 06:15:44 +0000 | [diff] [blame] | 438 | struct neigh_hash_table *nht; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 439 | |
| 440 | NEIGH_CACHE_STAT_INC(tbl, lookups); |
| 441 | |
Eric Dumazet | d6bf781 | 2010-10-04 06:15:44 +0000 | [diff] [blame] | 442 | rcu_read_lock_bh(); |
| 443 | nht = rcu_dereference_bh(tbl->nht); |
David S. Miller | cd08933 | 2011-07-11 01:28:12 -0700 | [diff] [blame] | 444 | 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] | 445 | |
| 446 | for (n = rcu_dereference_bh(nht->hash_buckets[hash_val]); |
| 447 | n != NULL; |
| 448 | n = rcu_dereference_bh(n->next)) { |
Eric W. Biederman | 426b530 | 2008-01-24 00:13:18 -0800 | [diff] [blame] | 449 | if (!memcmp(n->primary_key, pkey, key_len) && |
YOSHIFUJI Hideaki | 878628f | 2008-03-26 03:57:35 +0900 | [diff] [blame] | 450 | net_eq(dev_net(n->dev), net)) { |
Eric Dumazet | 767e97e | 2010-10-06 17:49:21 -0700 | [diff] [blame] | 451 | if (!atomic_inc_not_zero(&n->refcnt)) |
| 452 | n = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 453 | NEIGH_CACHE_STAT_INC(tbl, hits); |
| 454 | break; |
| 455 | } |
| 456 | } |
Eric Dumazet | 767e97e | 2010-10-06 17:49:21 -0700 | [diff] [blame] | 457 | |
Eric Dumazet | d6bf781 | 2010-10-04 06:15:44 +0000 | [diff] [blame] | 458 | rcu_read_unlock_bh(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 459 | return n; |
| 460 | } |
YOSHIFUJI Hideaki | 0a20450 | 2008-03-24 18:39:10 +0900 | [diff] [blame] | 461 | EXPORT_SYMBOL(neigh_lookup_nodev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 462 | |
David S. Miller | a263b30 | 2012-07-02 02:02:15 -0700 | [diff] [blame] | 463 | struct neighbour *__neigh_create(struct neigh_table *tbl, const void *pkey, |
| 464 | struct net_device *dev, bool want_ref) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 465 | { |
| 466 | u32 hash_val; |
| 467 | int key_len = tbl->key_len; |
| 468 | int error; |
David Miller | 596b9b6 | 2011-07-25 00:01:25 +0000 | [diff] [blame] | 469 | struct neighbour *n1, *rc, *n = neigh_alloc(tbl, dev); |
Eric Dumazet | d6bf781 | 2010-10-04 06:15:44 +0000 | [diff] [blame] | 470 | struct neigh_hash_table *nht; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 471 | |
| 472 | if (!n) { |
| 473 | rc = ERR_PTR(-ENOBUFS); |
| 474 | goto out; |
| 475 | } |
| 476 | |
| 477 | memcpy(n->primary_key, pkey, key_len); |
| 478 | n->dev = dev; |
| 479 | dev_hold(dev); |
| 480 | |
| 481 | /* Protocol specific setup. */ |
| 482 | if (tbl->constructor && (error = tbl->constructor(n)) < 0) { |
| 483 | rc = ERR_PTR(error); |
| 484 | goto out_neigh_release; |
| 485 | } |
| 486 | |
David Miller | da6a8fa | 2011-07-25 00:01:38 +0000 | [diff] [blame] | 487 | if (dev->netdev_ops->ndo_neigh_construct) { |
| 488 | error = dev->netdev_ops->ndo_neigh_construct(n); |
| 489 | if (error < 0) { |
| 490 | rc = ERR_PTR(error); |
| 491 | goto out_neigh_release; |
| 492 | } |
| 493 | } |
| 494 | |
David S. Miller | 447f219 | 2011-12-19 15:04:41 -0500 | [diff] [blame] | 495 | /* Device specific setup. */ |
| 496 | if (n->parms->neigh_setup && |
| 497 | (error = n->parms->neigh_setup(n)) < 0) { |
| 498 | rc = ERR_PTR(error); |
| 499 | goto out_neigh_release; |
| 500 | } |
| 501 | |
Jiri Pirko | 1f9248e5 | 2013-12-07 19:26:53 +0100 | [diff] [blame] | 502 | n->confirmed = jiffies - (NEIGH_VAR(n->parms, BASE_REACHABLE_TIME) << 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 503 | |
| 504 | write_lock_bh(&tbl->lock); |
Eric Dumazet | d6bf781 | 2010-10-04 06:15:44 +0000 | [diff] [blame] | 505 | nht = rcu_dereference_protected(tbl->nht, |
| 506 | lockdep_is_held(&tbl->lock)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 507 | |
David S. Miller | cd08933 | 2011-07-11 01:28:12 -0700 | [diff] [blame] | 508 | if (atomic_read(&tbl->entries) > (1 << nht->hash_shift)) |
| 509 | nht = neigh_hash_grow(tbl, nht->hash_shift + 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 510 | |
David S. Miller | cd08933 | 2011-07-11 01:28:12 -0700 | [diff] [blame] | 511 | 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] | 512 | |
| 513 | if (n->parms->dead) { |
| 514 | rc = ERR_PTR(-EINVAL); |
| 515 | goto out_tbl_unlock; |
| 516 | } |
| 517 | |
Eric Dumazet | 767e97e | 2010-10-06 17:49:21 -0700 | [diff] [blame] | 518 | for (n1 = rcu_dereference_protected(nht->hash_buckets[hash_val], |
| 519 | lockdep_is_held(&tbl->lock)); |
| 520 | n1 != NULL; |
| 521 | n1 = rcu_dereference_protected(n1->next, |
| 522 | lockdep_is_held(&tbl->lock))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 523 | if (dev == n1->dev && !memcmp(n1->primary_key, pkey, key_len)) { |
David S. Miller | a263b30 | 2012-07-02 02:02:15 -0700 | [diff] [blame] | 524 | if (want_ref) |
| 525 | neigh_hold(n1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 526 | rc = n1; |
| 527 | goto out_tbl_unlock; |
| 528 | } |
| 529 | } |
| 530 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 531 | n->dead = 0; |
David S. Miller | a263b30 | 2012-07-02 02:02:15 -0700 | [diff] [blame] | 532 | if (want_ref) |
| 533 | neigh_hold(n); |
Eric Dumazet | 767e97e | 2010-10-06 17:49:21 -0700 | [diff] [blame] | 534 | rcu_assign_pointer(n->next, |
| 535 | rcu_dereference_protected(nht->hash_buckets[hash_val], |
| 536 | lockdep_is_held(&tbl->lock))); |
| 537 | rcu_assign_pointer(nht->hash_buckets[hash_val], n); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 538 | write_unlock_bh(&tbl->lock); |
Joe Perches | d5d427c | 2013-04-15 15:17:19 +0000 | [diff] [blame] | 539 | neigh_dbg(2, "neigh %p is created\n", n); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 540 | rc = n; |
| 541 | out: |
| 542 | return rc; |
| 543 | out_tbl_unlock: |
| 544 | write_unlock_bh(&tbl->lock); |
| 545 | out_neigh_release: |
| 546 | neigh_release(n); |
| 547 | goto out; |
| 548 | } |
David S. Miller | a263b30 | 2012-07-02 02:02:15 -0700 | [diff] [blame] | 549 | EXPORT_SYMBOL(__neigh_create); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 550 | |
YOSHIFUJI Hideaki | be01d65 | 2008-03-28 12:46:53 +0900 | [diff] [blame] | 551 | static u32 pneigh_hash(const void *pkey, int key_len) |
Pavel Emelyanov | fa86d32 | 2008-03-24 14:48:59 -0700 | [diff] [blame] | 552 | { |
Pavel Emelyanov | fa86d32 | 2008-03-24 14:48:59 -0700 | [diff] [blame] | 553 | u32 hash_val = *(u32 *)(pkey + key_len - 4); |
Pavel Emelyanov | fa86d32 | 2008-03-24 14:48:59 -0700 | [diff] [blame] | 554 | hash_val ^= (hash_val >> 16); |
| 555 | hash_val ^= hash_val >> 8; |
| 556 | hash_val ^= hash_val >> 4; |
| 557 | hash_val &= PNEIGH_HASHMASK; |
YOSHIFUJI Hideaki | be01d65 | 2008-03-28 12:46:53 +0900 | [diff] [blame] | 558 | return hash_val; |
| 559 | } |
Pavel Emelyanov | fa86d32 | 2008-03-24 14:48:59 -0700 | [diff] [blame] | 560 | |
YOSHIFUJI Hideaki | be01d65 | 2008-03-28 12:46:53 +0900 | [diff] [blame] | 561 | static struct pneigh_entry *__pneigh_lookup_1(struct pneigh_entry *n, |
| 562 | struct net *net, |
| 563 | const void *pkey, |
| 564 | int key_len, |
| 565 | struct net_device *dev) |
| 566 | { |
| 567 | while (n) { |
Pavel Emelyanov | fa86d32 | 2008-03-24 14:48:59 -0700 | [diff] [blame] | 568 | if (!memcmp(n->key, pkey, key_len) && |
YOSHIFUJI Hideaki | be01d65 | 2008-03-28 12:46:53 +0900 | [diff] [blame] | 569 | net_eq(pneigh_net(n), net) && |
Pavel Emelyanov | fa86d32 | 2008-03-24 14:48:59 -0700 | [diff] [blame] | 570 | (n->dev == dev || !n->dev)) |
YOSHIFUJI Hideaki | be01d65 | 2008-03-28 12:46:53 +0900 | [diff] [blame] | 571 | return n; |
| 572 | n = n->next; |
Pavel Emelyanov | fa86d32 | 2008-03-24 14:48:59 -0700 | [diff] [blame] | 573 | } |
YOSHIFUJI Hideaki | be01d65 | 2008-03-28 12:46:53 +0900 | [diff] [blame] | 574 | return NULL; |
| 575 | } |
Pavel Emelyanov | fa86d32 | 2008-03-24 14:48:59 -0700 | [diff] [blame] | 576 | |
YOSHIFUJI Hideaki | be01d65 | 2008-03-28 12:46:53 +0900 | [diff] [blame] | 577 | struct pneigh_entry *__pneigh_lookup(struct neigh_table *tbl, |
| 578 | struct net *net, const void *pkey, struct net_device *dev) |
| 579 | { |
| 580 | int key_len = tbl->key_len; |
| 581 | u32 hash_val = pneigh_hash(pkey, key_len); |
| 582 | |
| 583 | return __pneigh_lookup_1(tbl->phash_buckets[hash_val], |
| 584 | net, pkey, key_len, dev); |
Pavel Emelyanov | fa86d32 | 2008-03-24 14:48:59 -0700 | [diff] [blame] | 585 | } |
YOSHIFUJI Hideaki | 0a20450 | 2008-03-24 18:39:10 +0900 | [diff] [blame] | 586 | EXPORT_SYMBOL_GPL(__pneigh_lookup); |
Pavel Emelyanov | fa86d32 | 2008-03-24 14:48:59 -0700 | [diff] [blame] | 587 | |
Eric W. Biederman | 426b530 | 2008-01-24 00:13:18 -0800 | [diff] [blame] | 588 | struct pneigh_entry * pneigh_lookup(struct neigh_table *tbl, |
| 589 | struct net *net, const void *pkey, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 590 | struct net_device *dev, int creat) |
| 591 | { |
| 592 | struct pneigh_entry *n; |
| 593 | int key_len = tbl->key_len; |
YOSHIFUJI Hideaki | be01d65 | 2008-03-28 12:46:53 +0900 | [diff] [blame] | 594 | u32 hash_val = pneigh_hash(pkey, key_len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 595 | |
| 596 | read_lock_bh(&tbl->lock); |
YOSHIFUJI Hideaki | be01d65 | 2008-03-28 12:46:53 +0900 | [diff] [blame] | 597 | n = __pneigh_lookup_1(tbl->phash_buckets[hash_val], |
| 598 | net, pkey, key_len, dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 599 | read_unlock_bh(&tbl->lock); |
YOSHIFUJI Hideaki | be01d65 | 2008-03-28 12:46:53 +0900 | [diff] [blame] | 600 | |
| 601 | if (n || !creat) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 602 | goto out; |
| 603 | |
Pavel Emelyanov | 4ae2894 | 2007-10-15 12:54:15 -0700 | [diff] [blame] | 604 | ASSERT_RTNL(); |
| 605 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 606 | n = kmalloc(sizeof(*n) + key_len, GFP_KERNEL); |
| 607 | if (!n) |
| 608 | goto out; |
| 609 | |
Eric Dumazet | e42ea98 | 2008-11-12 00:54:54 -0800 | [diff] [blame] | 610 | write_pnet(&n->net, hold_net(net)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 611 | memcpy(n->key, pkey, key_len); |
| 612 | n->dev = dev; |
| 613 | if (dev) |
| 614 | dev_hold(dev); |
| 615 | |
| 616 | if (tbl->pconstructor && tbl->pconstructor(n)) { |
| 617 | if (dev) |
| 618 | dev_put(dev); |
Denis V. Lunev | da12f73 | 2008-02-20 00:26:16 -0800 | [diff] [blame] | 619 | release_net(net); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 620 | kfree(n); |
| 621 | n = NULL; |
| 622 | goto out; |
| 623 | } |
| 624 | |
| 625 | write_lock_bh(&tbl->lock); |
| 626 | n->next = tbl->phash_buckets[hash_val]; |
| 627 | tbl->phash_buckets[hash_val] = n; |
| 628 | write_unlock_bh(&tbl->lock); |
| 629 | out: |
| 630 | return n; |
| 631 | } |
YOSHIFUJI Hideaki | 0a20450 | 2008-03-24 18:39:10 +0900 | [diff] [blame] | 632 | EXPORT_SYMBOL(pneigh_lookup); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 633 | |
| 634 | |
Eric W. Biederman | 426b530 | 2008-01-24 00:13:18 -0800 | [diff] [blame] | 635 | 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] | 636 | struct net_device *dev) |
| 637 | { |
| 638 | struct pneigh_entry *n, **np; |
| 639 | int key_len = tbl->key_len; |
YOSHIFUJI Hideaki | be01d65 | 2008-03-28 12:46:53 +0900 | [diff] [blame] | 640 | u32 hash_val = pneigh_hash(pkey, key_len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 641 | |
| 642 | write_lock_bh(&tbl->lock); |
| 643 | for (np = &tbl->phash_buckets[hash_val]; (n = *np) != NULL; |
| 644 | np = &n->next) { |
Eric W. Biederman | 426b530 | 2008-01-24 00:13:18 -0800 | [diff] [blame] | 645 | if (!memcmp(n->key, pkey, key_len) && n->dev == dev && |
YOSHIFUJI Hideaki | 878628f | 2008-03-26 03:57:35 +0900 | [diff] [blame] | 646 | net_eq(pneigh_net(n), net)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 647 | *np = n->next; |
| 648 | write_unlock_bh(&tbl->lock); |
| 649 | if (tbl->pdestructor) |
| 650 | tbl->pdestructor(n); |
| 651 | if (n->dev) |
| 652 | dev_put(n->dev); |
YOSHIFUJI Hideaki | 57da52c | 2008-03-26 03:49:59 +0900 | [diff] [blame] | 653 | release_net(pneigh_net(n)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 654 | kfree(n); |
| 655 | return 0; |
| 656 | } |
| 657 | } |
| 658 | write_unlock_bh(&tbl->lock); |
| 659 | return -ENOENT; |
| 660 | } |
| 661 | |
| 662 | static int pneigh_ifdown(struct neigh_table *tbl, struct net_device *dev) |
| 663 | { |
| 664 | struct pneigh_entry *n, **np; |
| 665 | u32 h; |
| 666 | |
| 667 | for (h = 0; h <= PNEIGH_HASHMASK; h++) { |
| 668 | np = &tbl->phash_buckets[h]; |
| 669 | while ((n = *np) != NULL) { |
| 670 | if (!dev || n->dev == dev) { |
| 671 | *np = n->next; |
| 672 | if (tbl->pdestructor) |
| 673 | tbl->pdestructor(n); |
| 674 | if (n->dev) |
| 675 | dev_put(n->dev); |
YOSHIFUJI Hideaki | 57da52c | 2008-03-26 03:49:59 +0900 | [diff] [blame] | 676 | release_net(pneigh_net(n)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 677 | kfree(n); |
| 678 | continue; |
| 679 | } |
| 680 | np = &n->next; |
| 681 | } |
| 682 | } |
| 683 | return -ENOENT; |
| 684 | } |
| 685 | |
Denis V. Lunev | 06f0511 | 2008-01-24 00:30:58 -0800 | [diff] [blame] | 686 | static void neigh_parms_destroy(struct neigh_parms *parms); |
| 687 | |
| 688 | static inline void neigh_parms_put(struct neigh_parms *parms) |
| 689 | { |
| 690 | if (atomic_dec_and_test(&parms->refcnt)) |
| 691 | neigh_parms_destroy(parms); |
| 692 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 693 | |
| 694 | /* |
| 695 | * neighbour must already be out of the table; |
| 696 | * |
| 697 | */ |
| 698 | void neigh_destroy(struct neighbour *neigh) |
| 699 | { |
David Miller | da6a8fa | 2011-07-25 00:01:38 +0000 | [diff] [blame] | 700 | struct net_device *dev = neigh->dev; |
| 701 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 702 | NEIGH_CACHE_STAT_INC(neigh->tbl, destroys); |
| 703 | |
| 704 | if (!neigh->dead) { |
Joe Perches | e005d19 | 2012-05-16 19:58:40 +0000 | [diff] [blame] | 705 | pr_warn("Destroying alive neighbour %p\n", neigh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 706 | dump_stack(); |
| 707 | return; |
| 708 | } |
| 709 | |
| 710 | if (neigh_del_timer(neigh)) |
Joe Perches | e005d19 | 2012-05-16 19:58:40 +0000 | [diff] [blame] | 711 | pr_warn("Impossible event\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 712 | |
Eric Dumazet | c9ab4d8 | 2013-06-28 02:37:42 -0700 | [diff] [blame] | 713 | write_lock_bh(&neigh->lock); |
| 714 | __skb_queue_purge(&neigh->arp_queue); |
| 715 | write_unlock_bh(&neigh->lock); |
Eric Dumazet | 8b5c171 | 2011-11-09 12:07:14 +0000 | [diff] [blame] | 716 | neigh->arp_queue_len_bytes = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 717 | |
David S. Miller | 447f219 | 2011-12-19 15:04:41 -0500 | [diff] [blame] | 718 | if (dev->netdev_ops->ndo_neigh_destroy) |
| 719 | dev->netdev_ops->ndo_neigh_destroy(neigh); |
| 720 | |
David Miller | da6a8fa | 2011-07-25 00:01:38 +0000 | [diff] [blame] | 721 | dev_put(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 722 | neigh_parms_put(neigh->parms); |
| 723 | |
Joe Perches | d5d427c | 2013-04-15 15:17:19 +0000 | [diff] [blame] | 724 | neigh_dbg(2, "neigh %p is destroyed\n", neigh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 725 | |
| 726 | atomic_dec(&neigh->tbl->entries); |
David Miller | 5b8b006 | 2011-07-25 00:01:22 +0000 | [diff] [blame] | 727 | kfree_rcu(neigh, rcu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 728 | } |
YOSHIFUJI Hideaki | 0a20450 | 2008-03-24 18:39:10 +0900 | [diff] [blame] | 729 | EXPORT_SYMBOL(neigh_destroy); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 730 | |
| 731 | /* Neighbour state is suspicious; |
| 732 | disable fast path. |
| 733 | |
| 734 | Called with write_locked neigh. |
| 735 | */ |
| 736 | static void neigh_suspect(struct neighbour *neigh) |
| 737 | { |
Joe Perches | d5d427c | 2013-04-15 15:17:19 +0000 | [diff] [blame] | 738 | neigh_dbg(2, "neigh %p is suspected\n", neigh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 739 | |
| 740 | neigh->output = neigh->ops->output; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 741 | } |
| 742 | |
| 743 | /* Neighbour state is OK; |
| 744 | enable fast path. |
| 745 | |
| 746 | Called with write_locked neigh. |
| 747 | */ |
| 748 | static void neigh_connect(struct neighbour *neigh) |
| 749 | { |
Joe Perches | d5d427c | 2013-04-15 15:17:19 +0000 | [diff] [blame] | 750 | neigh_dbg(2, "neigh %p is connected\n", neigh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 751 | |
| 752 | neigh->output = neigh->ops->connected_output; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 753 | } |
| 754 | |
Eric Dumazet | e4c4e44 | 2009-07-30 03:15:07 +0000 | [diff] [blame] | 755 | static void neigh_periodic_work(struct work_struct *work) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 756 | { |
Eric Dumazet | e4c4e44 | 2009-07-30 03:15:07 +0000 | [diff] [blame] | 757 | 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] | 758 | struct neighbour *n; |
| 759 | struct neighbour __rcu **np; |
Eric Dumazet | e4c4e44 | 2009-07-30 03:15:07 +0000 | [diff] [blame] | 760 | unsigned int i; |
Eric Dumazet | d6bf781 | 2010-10-04 06:15:44 +0000 | [diff] [blame] | 761 | struct neigh_hash_table *nht; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 762 | |
| 763 | NEIGH_CACHE_STAT_INC(tbl, periodic_gc_runs); |
| 764 | |
Eric Dumazet | e4c4e44 | 2009-07-30 03:15:07 +0000 | [diff] [blame] | 765 | write_lock_bh(&tbl->lock); |
Eric Dumazet | d6bf781 | 2010-10-04 06:15:44 +0000 | [diff] [blame] | 766 | nht = rcu_dereference_protected(tbl->nht, |
| 767 | lockdep_is_held(&tbl->lock)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 768 | |
YOSHIFUJI Hideaki / 吉藤英明 | 2724680 | 2013-01-22 05:20:05 +0000 | [diff] [blame] | 769 | if (atomic_read(&tbl->entries) < tbl->gc_thresh1) |
| 770 | goto out; |
| 771 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 772 | /* |
| 773 | * periodically recompute ReachableTime from random function |
| 774 | */ |
| 775 | |
Eric Dumazet | e4c4e44 | 2009-07-30 03:15:07 +0000 | [diff] [blame] | 776 | if (time_after(jiffies, tbl->last_rand + 300 * HZ)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 777 | struct neigh_parms *p; |
Eric Dumazet | e4c4e44 | 2009-07-30 03:15:07 +0000 | [diff] [blame] | 778 | tbl->last_rand = jiffies; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 779 | for (p = &tbl->parms; p; p = p->next) |
| 780 | p->reachable_time = |
Jiri Pirko | 1f9248e5 | 2013-12-07 19:26:53 +0100 | [diff] [blame] | 781 | neigh_rand_reach_time(NEIGH_VAR(p, BASE_REACHABLE_TIME)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 782 | } |
| 783 | |
David S. Miller | cd08933 | 2011-07-11 01:28:12 -0700 | [diff] [blame] | 784 | for (i = 0 ; i < (1 << nht->hash_shift); i++) { |
Eric Dumazet | d6bf781 | 2010-10-04 06:15:44 +0000 | [diff] [blame] | 785 | np = &nht->hash_buckets[i]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 786 | |
Eric Dumazet | 767e97e | 2010-10-06 17:49:21 -0700 | [diff] [blame] | 787 | while ((n = rcu_dereference_protected(*np, |
| 788 | lockdep_is_held(&tbl->lock))) != NULL) { |
Eric Dumazet | e4c4e44 | 2009-07-30 03:15:07 +0000 | [diff] [blame] | 789 | unsigned int state; |
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 | write_lock(&n->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 792 | |
Eric Dumazet | e4c4e44 | 2009-07-30 03:15:07 +0000 | [diff] [blame] | 793 | state = n->nud_state; |
| 794 | if (state & (NUD_PERMANENT | NUD_IN_TIMER)) { |
| 795 | write_unlock(&n->lock); |
| 796 | goto next_elt; |
| 797 | } |
| 798 | |
| 799 | if (time_before(n->used, n->confirmed)) |
| 800 | n->used = n->confirmed; |
| 801 | |
| 802 | if (atomic_read(&n->refcnt) == 1 && |
| 803 | (state == NUD_FAILED || |
Jiri Pirko | 1f9248e5 | 2013-12-07 19:26:53 +0100 | [diff] [blame] | 804 | time_after(jiffies, n->used + NEIGH_VAR(n->parms, GC_STALETIME)))) { |
Eric Dumazet | e4c4e44 | 2009-07-30 03:15:07 +0000 | [diff] [blame] | 805 | *np = n->next; |
| 806 | n->dead = 1; |
| 807 | write_unlock(&n->lock); |
| 808 | neigh_cleanup_and_release(n); |
| 809 | continue; |
| 810 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 811 | write_unlock(&n->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 812 | |
| 813 | next_elt: |
Eric Dumazet | e4c4e44 | 2009-07-30 03:15:07 +0000 | [diff] [blame] | 814 | np = &n->next; |
| 815 | } |
| 816 | /* |
| 817 | * It's fine to release lock here, even if hash table |
| 818 | * grows while we are preempted. |
| 819 | */ |
| 820 | write_unlock_bh(&tbl->lock); |
| 821 | cond_resched(); |
| 822 | write_lock_bh(&tbl->lock); |
Michel Machado | 84338a6 | 2012-02-21 16:04:13 -0500 | [diff] [blame] | 823 | nht = rcu_dereference_protected(tbl->nht, |
| 824 | lockdep_is_held(&tbl->lock)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 825 | } |
YOSHIFUJI Hideaki / 吉藤英明 | 2724680 | 2013-01-22 05:20:05 +0000 | [diff] [blame] | 826 | out: |
Jiri Pirko | 1f9248e5 | 2013-12-07 19:26:53 +0100 | [diff] [blame] | 827 | /* Cycle through all hash buckets every BASE_REACHABLE_TIME/2 ticks. |
| 828 | * ARP entry timeouts range from 1/2 BASE_REACHABLE_TIME to 3/2 |
| 829 | * BASE_REACHABLE_TIME. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 830 | */ |
viresh kumar | f618002 | 2014-01-22 12:23:33 +0530 | [diff] [blame] | 831 | queue_delayed_work(system_power_efficient_wq, &tbl->gc_work, |
Jiri Pirko | 1f9248e5 | 2013-12-07 19:26:53 +0100 | [diff] [blame] | 832 | NEIGH_VAR(&tbl->parms, BASE_REACHABLE_TIME) >> 1); |
Eric Dumazet | e4c4e44 | 2009-07-30 03:15:07 +0000 | [diff] [blame] | 833 | write_unlock_bh(&tbl->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 834 | } |
| 835 | |
| 836 | static __inline__ int neigh_max_probes(struct neighbour *n) |
| 837 | { |
| 838 | struct neigh_parms *p = n->parms; |
Timo Teräs | a960ff8 | 2014-02-26 11:43:04 +0200 | [diff] [blame^] | 839 | int max_probes = NEIGH_VAR(p, UCAST_PROBES) + NEIGH_VAR(p, APP_PROBES); |
| 840 | if (!(n->nud_state & NUD_PROBE)) |
| 841 | max_probes += NEIGH_VAR(p, MCAST_PROBES); |
| 842 | return max_probes; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 843 | } |
| 844 | |
Timo Teras | 5ef12d9 | 2009-06-11 04:16:28 -0700 | [diff] [blame] | 845 | static void neigh_invalidate(struct neighbour *neigh) |
Eric Dumazet | 0a14150 | 2010-03-09 19:40:54 +0000 | [diff] [blame] | 846 | __releases(neigh->lock) |
| 847 | __acquires(neigh->lock) |
Timo Teras | 5ef12d9 | 2009-06-11 04:16:28 -0700 | [diff] [blame] | 848 | { |
| 849 | struct sk_buff *skb; |
| 850 | |
| 851 | NEIGH_CACHE_STAT_INC(neigh->tbl, res_failed); |
Joe Perches | d5d427c | 2013-04-15 15:17:19 +0000 | [diff] [blame] | 852 | neigh_dbg(2, "neigh %p is failed\n", neigh); |
Timo Teras | 5ef12d9 | 2009-06-11 04:16:28 -0700 | [diff] [blame] | 853 | neigh->updated = jiffies; |
| 854 | |
| 855 | /* It is very thin place. report_unreachable is very complicated |
| 856 | routine. Particularly, it can hit the same neighbour entry! |
| 857 | |
| 858 | So that, we try to be accurate and avoid dead loop. --ANK |
| 859 | */ |
| 860 | while (neigh->nud_state == NUD_FAILED && |
| 861 | (skb = __skb_dequeue(&neigh->arp_queue)) != NULL) { |
| 862 | write_unlock(&neigh->lock); |
| 863 | neigh->ops->error_report(neigh, skb); |
| 864 | write_lock(&neigh->lock); |
| 865 | } |
Eric Dumazet | c9ab4d8 | 2013-06-28 02:37:42 -0700 | [diff] [blame] | 866 | __skb_queue_purge(&neigh->arp_queue); |
Eric Dumazet | 8b5c171 | 2011-11-09 12:07:14 +0000 | [diff] [blame] | 867 | neigh->arp_queue_len_bytes = 0; |
Timo Teras | 5ef12d9 | 2009-06-11 04:16:28 -0700 | [diff] [blame] | 868 | } |
| 869 | |
Eric Dumazet | cd28ca0 | 2011-08-09 08:15:58 +0000 | [diff] [blame] | 870 | static void neigh_probe(struct neighbour *neigh) |
| 871 | __releases(neigh->lock) |
| 872 | { |
Hannes Frederic Sowa | 4ed377e | 2013-09-21 06:32:34 +0200 | [diff] [blame] | 873 | struct sk_buff *skb = skb_peek_tail(&neigh->arp_queue); |
Eric Dumazet | cd28ca0 | 2011-08-09 08:15:58 +0000 | [diff] [blame] | 874 | /* keep skb alive even if arp_queue overflows */ |
| 875 | if (skb) |
| 876 | skb = skb_copy(skb, GFP_ATOMIC); |
| 877 | write_unlock(&neigh->lock); |
| 878 | neigh->ops->solicit(neigh, skb); |
| 879 | atomic_inc(&neigh->probes); |
| 880 | kfree_skb(skb); |
| 881 | } |
| 882 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 883 | /* Called when a timer expires for a neighbour entry. */ |
| 884 | |
| 885 | static void neigh_timer_handler(unsigned long arg) |
| 886 | { |
| 887 | unsigned long now, next; |
| 888 | struct neighbour *neigh = (struct neighbour *)arg; |
Eric Dumazet | 95c9617 | 2012-04-15 05:58:06 +0000 | [diff] [blame] | 889 | unsigned int state; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 890 | int notify = 0; |
| 891 | |
| 892 | write_lock(&neigh->lock); |
| 893 | |
| 894 | state = neigh->nud_state; |
| 895 | now = jiffies; |
| 896 | next = now + HZ; |
| 897 | |
David S. Miller | 045f7b3 | 2011-11-01 17:45:55 -0400 | [diff] [blame] | 898 | if (!(state & NUD_IN_TIMER)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 899 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 900 | |
| 901 | if (state & NUD_REACHABLE) { |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 902 | if (time_before_eq(now, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 903 | neigh->confirmed + neigh->parms->reachable_time)) { |
Joe Perches | d5d427c | 2013-04-15 15:17:19 +0000 | [diff] [blame] | 904 | neigh_dbg(2, "neigh %p is still alive\n", neigh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 905 | next = neigh->confirmed + neigh->parms->reachable_time; |
| 906 | } else if (time_before_eq(now, |
Jiri Pirko | 1f9248e5 | 2013-12-07 19:26:53 +0100 | [diff] [blame] | 907 | neigh->used + |
| 908 | NEIGH_VAR(neigh->parms, DELAY_PROBE_TIME))) { |
Joe Perches | d5d427c | 2013-04-15 15:17:19 +0000 | [diff] [blame] | 909 | neigh_dbg(2, "neigh %p is delayed\n", neigh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 910 | neigh->nud_state = NUD_DELAY; |
YOSHIFUJI Hideaki | 955aaa2 | 2006-03-20 16:52:52 -0800 | [diff] [blame] | 911 | neigh->updated = jiffies; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 912 | neigh_suspect(neigh); |
Jiri Pirko | 1f9248e5 | 2013-12-07 19:26:53 +0100 | [diff] [blame] | 913 | next = now + NEIGH_VAR(neigh->parms, DELAY_PROBE_TIME); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 914 | } else { |
Joe Perches | d5d427c | 2013-04-15 15:17:19 +0000 | [diff] [blame] | 915 | neigh_dbg(2, "neigh %p is suspected\n", neigh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 916 | neigh->nud_state = NUD_STALE; |
YOSHIFUJI Hideaki | 955aaa2 | 2006-03-20 16:52:52 -0800 | [diff] [blame] | 917 | neigh->updated = jiffies; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 918 | neigh_suspect(neigh); |
Tom Tucker | 8d71740 | 2006-07-30 20:43:36 -0700 | [diff] [blame] | 919 | notify = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 920 | } |
| 921 | } else if (state & NUD_DELAY) { |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 922 | if (time_before_eq(now, |
Jiri Pirko | 1f9248e5 | 2013-12-07 19:26:53 +0100 | [diff] [blame] | 923 | neigh->confirmed + |
| 924 | NEIGH_VAR(neigh->parms, DELAY_PROBE_TIME))) { |
Joe Perches | d5d427c | 2013-04-15 15:17:19 +0000 | [diff] [blame] | 925 | neigh_dbg(2, "neigh %p is now reachable\n", neigh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 926 | neigh->nud_state = NUD_REACHABLE; |
YOSHIFUJI Hideaki | 955aaa2 | 2006-03-20 16:52:52 -0800 | [diff] [blame] | 927 | neigh->updated = jiffies; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 928 | neigh_connect(neigh); |
Tom Tucker | 8d71740 | 2006-07-30 20:43:36 -0700 | [diff] [blame] | 929 | notify = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 930 | next = neigh->confirmed + neigh->parms->reachable_time; |
| 931 | } else { |
Joe Perches | d5d427c | 2013-04-15 15:17:19 +0000 | [diff] [blame] | 932 | neigh_dbg(2, "neigh %p is probed\n", neigh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 933 | neigh->nud_state = NUD_PROBE; |
YOSHIFUJI Hideaki | 955aaa2 | 2006-03-20 16:52:52 -0800 | [diff] [blame] | 934 | neigh->updated = jiffies; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 935 | atomic_set(&neigh->probes, 0); |
Jiri Pirko | 1f9248e5 | 2013-12-07 19:26:53 +0100 | [diff] [blame] | 936 | next = now + NEIGH_VAR(neigh->parms, RETRANS_TIME); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 937 | } |
| 938 | } else { |
| 939 | /* NUD_PROBE|NUD_INCOMPLETE */ |
Jiri Pirko | 1f9248e5 | 2013-12-07 19:26:53 +0100 | [diff] [blame] | 940 | next = now + NEIGH_VAR(neigh->parms, RETRANS_TIME); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 941 | } |
| 942 | |
| 943 | if ((neigh->nud_state & (NUD_INCOMPLETE | NUD_PROBE)) && |
| 944 | atomic_read(&neigh->probes) >= neigh_max_probes(neigh)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 945 | neigh->nud_state = NUD_FAILED; |
| 946 | notify = 1; |
Timo Teras | 5ef12d9 | 2009-06-11 04:16:28 -0700 | [diff] [blame] | 947 | neigh_invalidate(neigh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 948 | } |
| 949 | |
| 950 | if (neigh->nud_state & NUD_IN_TIMER) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 951 | if (time_before(next, jiffies + HZ/2)) |
| 952 | next = jiffies + HZ/2; |
Herbert Xu | 6fb9974 | 2005-10-23 16:37:48 +1000 | [diff] [blame] | 953 | if (!mod_timer(&neigh->timer, next)) |
| 954 | neigh_hold(neigh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 955 | } |
| 956 | if (neigh->nud_state & (NUD_INCOMPLETE | NUD_PROBE)) { |
Eric Dumazet | cd28ca0 | 2011-08-09 08:15:58 +0000 | [diff] [blame] | 957 | neigh_probe(neigh); |
David S. Miller | 9ff5660 | 2008-02-17 18:39:54 -0800 | [diff] [blame] | 958 | } else { |
David S. Miller | 69cc64d | 2008-02-11 21:45:44 -0800 | [diff] [blame] | 959 | out: |
David S. Miller | 9ff5660 | 2008-02-17 18:39:54 -0800 | [diff] [blame] | 960 | write_unlock(&neigh->lock); |
| 961 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 962 | |
Thomas Graf | d961db3 | 2007-08-08 23:12:56 -0700 | [diff] [blame] | 963 | if (notify) |
| 964 | neigh_update_notify(neigh); |
| 965 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 966 | neigh_release(neigh); |
| 967 | } |
| 968 | |
| 969 | int __neigh_event_send(struct neighbour *neigh, struct sk_buff *skb) |
| 970 | { |
| 971 | int rc; |
Eric Dumazet | cd28ca0 | 2011-08-09 08:15:58 +0000 | [diff] [blame] | 972 | bool immediate_probe = false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 973 | |
| 974 | write_lock_bh(&neigh->lock); |
| 975 | |
| 976 | rc = 0; |
| 977 | if (neigh->nud_state & (NUD_CONNECTED | NUD_DELAY | NUD_PROBE)) |
| 978 | goto out_unlock_bh; |
| 979 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 980 | if (!(neigh->nud_state & (NUD_STALE | NUD_INCOMPLETE))) { |
Jiri Pirko | 1f9248e5 | 2013-12-07 19:26:53 +0100 | [diff] [blame] | 981 | if (NEIGH_VAR(neigh->parms, MCAST_PROBES) + |
| 982 | NEIGH_VAR(neigh->parms, APP_PROBES)) { |
Eric Dumazet | cd28ca0 | 2011-08-09 08:15:58 +0000 | [diff] [blame] | 983 | unsigned long next, now = jiffies; |
| 984 | |
Jiri Pirko | 1f9248e5 | 2013-12-07 19:26:53 +0100 | [diff] [blame] | 985 | atomic_set(&neigh->probes, |
| 986 | NEIGH_VAR(neigh->parms, UCAST_PROBES)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 987 | neigh->nud_state = NUD_INCOMPLETE; |
Eric Dumazet | cd28ca0 | 2011-08-09 08:15:58 +0000 | [diff] [blame] | 988 | neigh->updated = now; |
Jiri Pirko | 1f9248e5 | 2013-12-07 19:26:53 +0100 | [diff] [blame] | 989 | next = now + max(NEIGH_VAR(neigh->parms, RETRANS_TIME), |
| 990 | HZ/2); |
Eric Dumazet | cd28ca0 | 2011-08-09 08:15:58 +0000 | [diff] [blame] | 991 | neigh_add_timer(neigh, next); |
| 992 | immediate_probe = true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 993 | } else { |
| 994 | neigh->nud_state = NUD_FAILED; |
YOSHIFUJI Hideaki | 955aaa2 | 2006-03-20 16:52:52 -0800 | [diff] [blame] | 995 | neigh->updated = jiffies; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 996 | write_unlock_bh(&neigh->lock); |
| 997 | |
Wei Yongjun | f3fbbe0 | 2009-02-25 00:37:32 +0000 | [diff] [blame] | 998 | kfree_skb(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 999 | return 1; |
| 1000 | } |
| 1001 | } else if (neigh->nud_state & NUD_STALE) { |
Joe Perches | d5d427c | 2013-04-15 15:17:19 +0000 | [diff] [blame] | 1002 | neigh_dbg(2, "neigh %p is delayed\n", neigh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1003 | neigh->nud_state = NUD_DELAY; |
YOSHIFUJI Hideaki | 955aaa2 | 2006-03-20 16:52:52 -0800 | [diff] [blame] | 1004 | neigh->updated = jiffies; |
Jiri Pirko | 1f9248e5 | 2013-12-07 19:26:53 +0100 | [diff] [blame] | 1005 | neigh_add_timer(neigh, jiffies + |
| 1006 | NEIGH_VAR(neigh->parms, DELAY_PROBE_TIME)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1007 | } |
| 1008 | |
| 1009 | if (neigh->nud_state == NUD_INCOMPLETE) { |
| 1010 | if (skb) { |
Eric Dumazet | 8b5c171 | 2011-11-09 12:07:14 +0000 | [diff] [blame] | 1011 | while (neigh->arp_queue_len_bytes + skb->truesize > |
Jiri Pirko | 1f9248e5 | 2013-12-07 19:26:53 +0100 | [diff] [blame] | 1012 | NEIGH_VAR(neigh->parms, QUEUE_LEN_BYTES)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1013 | struct sk_buff *buff; |
Eric Dumazet | 8b5c171 | 2011-11-09 12:07:14 +0000 | [diff] [blame] | 1014 | |
David S. Miller | f72051b | 2008-09-23 01:11:18 -0700 | [diff] [blame] | 1015 | buff = __skb_dequeue(&neigh->arp_queue); |
Eric Dumazet | 8b5c171 | 2011-11-09 12:07:14 +0000 | [diff] [blame] | 1016 | if (!buff) |
| 1017 | break; |
| 1018 | neigh->arp_queue_len_bytes -= buff->truesize; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1019 | kfree_skb(buff); |
Neil Horman | 9a6d276 | 2008-07-16 20:50:49 -0700 | [diff] [blame] | 1020 | NEIGH_CACHE_STAT_INC(neigh->tbl, unres_discards); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1021 | } |
Eric Dumazet | a473113 | 2010-05-27 16:09:39 -0700 | [diff] [blame] | 1022 | skb_dst_force(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1023 | __skb_queue_tail(&neigh->arp_queue, skb); |
Eric Dumazet | 8b5c171 | 2011-11-09 12:07:14 +0000 | [diff] [blame] | 1024 | neigh->arp_queue_len_bytes += skb->truesize; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1025 | } |
| 1026 | rc = 1; |
| 1027 | } |
| 1028 | out_unlock_bh: |
Eric Dumazet | cd28ca0 | 2011-08-09 08:15:58 +0000 | [diff] [blame] | 1029 | if (immediate_probe) |
| 1030 | neigh_probe(neigh); |
| 1031 | else |
| 1032 | write_unlock(&neigh->lock); |
| 1033 | local_bh_enable(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1034 | return rc; |
| 1035 | } |
YOSHIFUJI Hideaki | 0a20450 | 2008-03-24 18:39:10 +0900 | [diff] [blame] | 1036 | EXPORT_SYMBOL(__neigh_event_send); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1037 | |
David S. Miller | f6b72b6 | 2011-07-14 07:53:20 -0700 | [diff] [blame] | 1038 | static void neigh_update_hhs(struct neighbour *neigh) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1039 | { |
| 1040 | struct hh_cache *hh; |
Stephen Hemminger | 3b04ddd | 2007-10-09 01:40:57 -0700 | [diff] [blame] | 1041 | void (*update)(struct hh_cache*, const struct net_device*, const unsigned char *) |
Doug Kehn | 91a72a7 | 2010-07-14 18:02:16 -0700 | [diff] [blame] | 1042 | = NULL; |
| 1043 | |
| 1044 | if (neigh->dev->header_ops) |
| 1045 | update = neigh->dev->header_ops->cache_update; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1046 | |
| 1047 | if (update) { |
David S. Miller | f6b72b6 | 2011-07-14 07:53:20 -0700 | [diff] [blame] | 1048 | hh = &neigh->hh; |
| 1049 | if (hh->hh_len) { |
Stephen Hemminger | 3644f0c | 2006-12-07 15:08:17 -0800 | [diff] [blame] | 1050 | write_seqlock_bh(&hh->hh_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1051 | update(hh, neigh->dev, neigh->ha); |
Stephen Hemminger | 3644f0c | 2006-12-07 15:08:17 -0800 | [diff] [blame] | 1052 | write_sequnlock_bh(&hh->hh_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1053 | } |
| 1054 | } |
| 1055 | } |
| 1056 | |
| 1057 | |
| 1058 | |
| 1059 | /* Generic update routine. |
| 1060 | -- lladdr is new lladdr or NULL, if it is not supplied. |
| 1061 | -- new is new state. |
| 1062 | -- flags |
| 1063 | NEIGH_UPDATE_F_OVERRIDE allows to override existing lladdr, |
| 1064 | if it is different. |
| 1065 | NEIGH_UPDATE_F_WEAK_OVERRIDE will suspect existing "connected" |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1066 | lladdr instead of overriding it |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1067 | if it is different. |
| 1068 | It also allows to retain current state |
| 1069 | if lladdr is unchanged. |
| 1070 | NEIGH_UPDATE_F_ADMIN means that the change is administrative. |
| 1071 | |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1072 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER allows to override existing |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1073 | NTF_ROUTER flag. |
| 1074 | NEIGH_UPDATE_F_ISROUTER indicates if the neighbour is known as |
| 1075 | a router. |
| 1076 | |
| 1077 | Caller MUST hold reference count on the entry. |
| 1078 | */ |
| 1079 | |
| 1080 | int neigh_update(struct neighbour *neigh, const u8 *lladdr, u8 new, |
| 1081 | u32 flags) |
| 1082 | { |
| 1083 | u8 old; |
| 1084 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1085 | int notify = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1086 | struct net_device *dev; |
| 1087 | int update_isrouter = 0; |
| 1088 | |
| 1089 | write_lock_bh(&neigh->lock); |
| 1090 | |
| 1091 | dev = neigh->dev; |
| 1092 | old = neigh->nud_state; |
| 1093 | err = -EPERM; |
| 1094 | |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1095 | if (!(flags & NEIGH_UPDATE_F_ADMIN) && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1096 | (old & (NUD_NOARP | NUD_PERMANENT))) |
| 1097 | goto out; |
| 1098 | |
| 1099 | if (!(new & NUD_VALID)) { |
| 1100 | neigh_del_timer(neigh); |
| 1101 | if (old & NUD_CONNECTED) |
| 1102 | neigh_suspect(neigh); |
| 1103 | neigh->nud_state = new; |
| 1104 | err = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1105 | notify = old & NUD_VALID; |
Timo Teras | 5ef12d9 | 2009-06-11 04:16:28 -0700 | [diff] [blame] | 1106 | if ((old & (NUD_INCOMPLETE | NUD_PROBE)) && |
| 1107 | (new & NUD_FAILED)) { |
| 1108 | neigh_invalidate(neigh); |
| 1109 | notify = 1; |
| 1110 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1111 | goto out; |
| 1112 | } |
| 1113 | |
| 1114 | /* Compare new lladdr with cached one */ |
| 1115 | if (!dev->addr_len) { |
| 1116 | /* First case: device needs no address. */ |
| 1117 | lladdr = neigh->ha; |
| 1118 | } else if (lladdr) { |
| 1119 | /* The second case: if something is already cached |
| 1120 | and a new address is proposed: |
| 1121 | - compare new & old |
| 1122 | - if they are different, check override flag |
| 1123 | */ |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1124 | if ((old & NUD_VALID) && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1125 | !memcmp(lladdr, neigh->ha, dev->addr_len)) |
| 1126 | lladdr = neigh->ha; |
| 1127 | } else { |
| 1128 | /* No address is supplied; if we know something, |
| 1129 | use it, otherwise discard the request. |
| 1130 | */ |
| 1131 | err = -EINVAL; |
| 1132 | if (!(old & NUD_VALID)) |
| 1133 | goto out; |
| 1134 | lladdr = neigh->ha; |
| 1135 | } |
| 1136 | |
| 1137 | if (new & NUD_CONNECTED) |
| 1138 | neigh->confirmed = jiffies; |
| 1139 | neigh->updated = jiffies; |
| 1140 | |
| 1141 | /* If entry was valid and address is not changed, |
| 1142 | do not change entry state, if new one is STALE. |
| 1143 | */ |
| 1144 | err = 0; |
| 1145 | update_isrouter = flags & NEIGH_UPDATE_F_OVERRIDE_ISROUTER; |
| 1146 | if (old & NUD_VALID) { |
| 1147 | if (lladdr != neigh->ha && !(flags & NEIGH_UPDATE_F_OVERRIDE)) { |
| 1148 | update_isrouter = 0; |
| 1149 | if ((flags & NEIGH_UPDATE_F_WEAK_OVERRIDE) && |
| 1150 | (old & NUD_CONNECTED)) { |
| 1151 | lladdr = neigh->ha; |
| 1152 | new = NUD_STALE; |
| 1153 | } else |
| 1154 | goto out; |
| 1155 | } else { |
| 1156 | if (lladdr == neigh->ha && new == NUD_STALE && |
| 1157 | ((flags & NEIGH_UPDATE_F_WEAK_OVERRIDE) || |
| 1158 | (old & NUD_CONNECTED)) |
| 1159 | ) |
| 1160 | new = old; |
| 1161 | } |
| 1162 | } |
| 1163 | |
| 1164 | if (new != old) { |
| 1165 | neigh_del_timer(neigh); |
Pavel Emelyanov | a43d899 | 2007-12-20 15:49:05 -0800 | [diff] [blame] | 1166 | if (new & NUD_IN_TIMER) |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1167 | neigh_add_timer(neigh, (jiffies + |
| 1168 | ((new & NUD_REACHABLE) ? |
David S. Miller | 667347f | 2005-09-27 12:07:44 -0700 | [diff] [blame] | 1169 | neigh->parms->reachable_time : |
| 1170 | 0))); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1171 | neigh->nud_state = new; |
Bob Gilligan | 53385d2 | 2013-12-15 13:39:56 -0800 | [diff] [blame] | 1172 | notify = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1173 | } |
| 1174 | |
| 1175 | if (lladdr != neigh->ha) { |
Eric Dumazet | 0ed8ddf | 2010-10-07 10:44:07 +0000 | [diff] [blame] | 1176 | write_seqlock(&neigh->ha_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1177 | memcpy(&neigh->ha, lladdr, dev->addr_len); |
Eric Dumazet | 0ed8ddf | 2010-10-07 10:44:07 +0000 | [diff] [blame] | 1178 | write_sequnlock(&neigh->ha_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1179 | neigh_update_hhs(neigh); |
| 1180 | if (!(new & NUD_CONNECTED)) |
| 1181 | neigh->confirmed = jiffies - |
Jiri Pirko | 1f9248e5 | 2013-12-07 19:26:53 +0100 | [diff] [blame] | 1182 | (NEIGH_VAR(neigh->parms, BASE_REACHABLE_TIME) << 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1183 | notify = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1184 | } |
| 1185 | if (new == old) |
| 1186 | goto out; |
| 1187 | if (new & NUD_CONNECTED) |
| 1188 | neigh_connect(neigh); |
| 1189 | else |
| 1190 | neigh_suspect(neigh); |
| 1191 | if (!(old & NUD_VALID)) { |
| 1192 | struct sk_buff *skb; |
| 1193 | |
| 1194 | /* Again: avoid dead loop if something went wrong */ |
| 1195 | |
| 1196 | while (neigh->nud_state & NUD_VALID && |
| 1197 | (skb = __skb_dequeue(&neigh->arp_queue)) != NULL) { |
David S. Miller | 69cce1d | 2011-07-17 23:09:49 -0700 | [diff] [blame] | 1198 | struct dst_entry *dst = skb_dst(skb); |
| 1199 | struct neighbour *n2, *n1 = neigh; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1200 | write_unlock_bh(&neigh->lock); |
roy.qing.li@gmail.com | e049f28 | 2011-10-17 22:32:42 +0000 | [diff] [blame] | 1201 | |
| 1202 | rcu_read_lock(); |
David S. Miller | 13a43d9 | 2012-07-02 22:15:37 -0700 | [diff] [blame] | 1203 | |
| 1204 | /* Why not just use 'neigh' as-is? The problem is that |
| 1205 | * things such as shaper, eql, and sch_teql can end up |
| 1206 | * using alternative, different, neigh objects to output |
| 1207 | * the packet in the output path. So what we need to do |
| 1208 | * here is re-lookup the top-level neigh in the path so |
| 1209 | * we can reinject the packet there. |
| 1210 | */ |
| 1211 | n2 = NULL; |
| 1212 | if (dst) { |
| 1213 | n2 = dst_neigh_lookup_skb(dst, skb); |
| 1214 | if (n2) |
| 1215 | n1 = n2; |
| 1216 | } |
David S. Miller | 8f40b16 | 2011-07-17 13:34:11 -0700 | [diff] [blame] | 1217 | n1->output(n1, skb); |
David S. Miller | 13a43d9 | 2012-07-02 22:15:37 -0700 | [diff] [blame] | 1218 | if (n2) |
| 1219 | neigh_release(n2); |
roy.qing.li@gmail.com | e049f28 | 2011-10-17 22:32:42 +0000 | [diff] [blame] | 1220 | rcu_read_unlock(); |
| 1221 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1222 | write_lock_bh(&neigh->lock); |
| 1223 | } |
Eric Dumazet | c9ab4d8 | 2013-06-28 02:37:42 -0700 | [diff] [blame] | 1224 | __skb_queue_purge(&neigh->arp_queue); |
Eric Dumazet | 8b5c171 | 2011-11-09 12:07:14 +0000 | [diff] [blame] | 1225 | neigh->arp_queue_len_bytes = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1226 | } |
| 1227 | out: |
| 1228 | if (update_isrouter) { |
| 1229 | neigh->flags = (flags & NEIGH_UPDATE_F_ISROUTER) ? |
| 1230 | (neigh->flags | NTF_ROUTER) : |
| 1231 | (neigh->flags & ~NTF_ROUTER); |
| 1232 | } |
| 1233 | write_unlock_bh(&neigh->lock); |
Tom Tucker | 8d71740 | 2006-07-30 20:43:36 -0700 | [diff] [blame] | 1234 | |
| 1235 | if (notify) |
Thomas Graf | d961db3 | 2007-08-08 23:12:56 -0700 | [diff] [blame] | 1236 | neigh_update_notify(neigh); |
| 1237 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1238 | return err; |
| 1239 | } |
YOSHIFUJI Hideaki | 0a20450 | 2008-03-24 18:39:10 +0900 | [diff] [blame] | 1240 | EXPORT_SYMBOL(neigh_update); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1241 | |
Jiri Benc | 7e98056 | 2013-12-11 13:48:20 +0100 | [diff] [blame] | 1242 | /* Update the neigh to listen temporarily for probe responses, even if it is |
| 1243 | * in a NUD_FAILED state. The caller has to hold neigh->lock for writing. |
| 1244 | */ |
| 1245 | void __neigh_set_probe_once(struct neighbour *neigh) |
| 1246 | { |
| 1247 | neigh->updated = jiffies; |
| 1248 | if (!(neigh->nud_state & NUD_FAILED)) |
| 1249 | return; |
| 1250 | neigh->nud_state = NUD_PROBE; |
| 1251 | atomic_set(&neigh->probes, NEIGH_VAR(neigh->parms, UCAST_PROBES)); |
| 1252 | neigh_add_timer(neigh, |
| 1253 | jiffies + NEIGH_VAR(neigh->parms, RETRANS_TIME)); |
| 1254 | } |
| 1255 | EXPORT_SYMBOL(__neigh_set_probe_once); |
| 1256 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1257 | struct neighbour *neigh_event_ns(struct neigh_table *tbl, |
| 1258 | u8 *lladdr, void *saddr, |
| 1259 | struct net_device *dev) |
| 1260 | { |
| 1261 | struct neighbour *neigh = __neigh_lookup(tbl, saddr, dev, |
| 1262 | lladdr || !dev->addr_len); |
| 1263 | if (neigh) |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1264 | neigh_update(neigh, lladdr, NUD_STALE, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1265 | NEIGH_UPDATE_F_OVERRIDE); |
| 1266 | return neigh; |
| 1267 | } |
YOSHIFUJI Hideaki | 0a20450 | 2008-03-24 18:39:10 +0900 | [diff] [blame] | 1268 | EXPORT_SYMBOL(neigh_event_ns); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1269 | |
Eric Dumazet | 34d101d | 2010-10-11 09:16:57 -0700 | [diff] [blame] | 1270 | /* called with read_lock_bh(&n->lock); */ |
David S. Miller | f6b72b6 | 2011-07-14 07:53:20 -0700 | [diff] [blame] | 1271 | static void neigh_hh_init(struct neighbour *n, struct dst_entry *dst) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1272 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1273 | struct net_device *dev = dst->dev; |
David S. Miller | f6b72b6 | 2011-07-14 07:53:20 -0700 | [diff] [blame] | 1274 | __be16 prot = dst->ops->protocol; |
| 1275 | struct hh_cache *hh = &n->hh; |
Eric Dumazet | 0ed8ddf | 2010-10-07 10:44:07 +0000 | [diff] [blame] | 1276 | |
| 1277 | write_lock_bh(&n->lock); |
Eric Dumazet | 34d101d | 2010-10-11 09:16:57 -0700 | [diff] [blame] | 1278 | |
David S. Miller | f6b72b6 | 2011-07-14 07:53:20 -0700 | [diff] [blame] | 1279 | /* Only one thread can come in here and initialize the |
| 1280 | * hh_cache entry. |
| 1281 | */ |
David S. Miller | b23b545 | 2011-07-16 17:45:02 -0700 | [diff] [blame] | 1282 | if (!hh->hh_len) |
| 1283 | dev->header_ops->cache(n, hh, prot); |
David S. Miller | f6b72b6 | 2011-07-14 07:53:20 -0700 | [diff] [blame] | 1284 | |
Eric Dumazet | 0ed8ddf | 2010-10-07 10:44:07 +0000 | [diff] [blame] | 1285 | write_unlock_bh(&n->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1286 | } |
| 1287 | |
| 1288 | /* 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] | 1289 | * worked, f.e. if you want to override normal output path (eql, shaper), |
| 1290 | * but resolution is not made yet. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1291 | */ |
| 1292 | |
David S. Miller | 8f40b16 | 2011-07-17 13:34:11 -0700 | [diff] [blame] | 1293 | int neigh_compat_output(struct neighbour *neigh, struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1294 | { |
| 1295 | struct net_device *dev = skb->dev; |
| 1296 | |
Arnaldo Carvalho de Melo | bbe735e | 2007-03-10 22:16:10 -0300 | [diff] [blame] | 1297 | __skb_pull(skb, skb_network_offset(skb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1298 | |
Stephen Hemminger | 0c4e858 | 2007-10-09 01:36:32 -0700 | [diff] [blame] | 1299 | if (dev_hard_header(skb, dev, ntohs(skb->protocol), NULL, NULL, |
| 1300 | skb->len) < 0 && |
David S. Miller | 2205369 | 2013-12-31 16:23:35 -0500 | [diff] [blame] | 1301 | dev_rebuild_header(skb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1302 | return 0; |
| 1303 | |
| 1304 | return dev_queue_xmit(skb); |
| 1305 | } |
YOSHIFUJI Hideaki | 0a20450 | 2008-03-24 18:39:10 +0900 | [diff] [blame] | 1306 | EXPORT_SYMBOL(neigh_compat_output); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1307 | |
| 1308 | /* Slow and careful. */ |
| 1309 | |
David S. Miller | 8f40b16 | 2011-07-17 13:34:11 -0700 | [diff] [blame] | 1310 | int neigh_resolve_output(struct neighbour *neigh, struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1311 | { |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 1312 | struct dst_entry *dst = skb_dst(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1313 | int rc = 0; |
| 1314 | |
David S. Miller | 8f40b16 | 2011-07-17 13:34:11 -0700 | [diff] [blame] | 1315 | if (!dst) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1316 | goto discard; |
| 1317 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1318 | if (!neigh_event_send(neigh, skb)) { |
| 1319 | int err; |
| 1320 | struct net_device *dev = neigh->dev; |
Eric Dumazet | 0ed8ddf | 2010-10-07 10:44:07 +0000 | [diff] [blame] | 1321 | unsigned int seq; |
Eric Dumazet | 34d101d | 2010-10-11 09:16:57 -0700 | [diff] [blame] | 1322 | |
David S. Miller | f6b72b6 | 2011-07-14 07:53:20 -0700 | [diff] [blame] | 1323 | if (dev->header_ops->cache && !neigh->hh.hh_len) |
| 1324 | neigh_hh_init(neigh, dst); |
Eric Dumazet | 34d101d | 2010-10-11 09:16:57 -0700 | [diff] [blame] | 1325 | |
Eric Dumazet | 0ed8ddf | 2010-10-07 10:44:07 +0000 | [diff] [blame] | 1326 | do { |
ramesh.nagappa@gmail.com | e1f1650 | 2012-10-05 19:10:15 +0000 | [diff] [blame] | 1327 | __skb_pull(skb, skb_network_offset(skb)); |
Eric Dumazet | 0ed8ddf | 2010-10-07 10:44:07 +0000 | [diff] [blame] | 1328 | seq = read_seqbegin(&neigh->ha_lock); |
| 1329 | err = dev_hard_header(skb, dev, ntohs(skb->protocol), |
| 1330 | neigh->ha, NULL, skb->len); |
| 1331 | } while (read_seqretry(&neigh->ha_lock, seq)); |
Eric Dumazet | 34d101d | 2010-10-11 09:16:57 -0700 | [diff] [blame] | 1332 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1333 | if (err >= 0) |
David S. Miller | 542d4d6 | 2011-07-16 18:06:24 -0700 | [diff] [blame] | 1334 | rc = dev_queue_xmit(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1335 | else |
| 1336 | goto out_kfree_skb; |
| 1337 | } |
| 1338 | out: |
| 1339 | return rc; |
| 1340 | discard: |
Joe Perches | d5d427c | 2013-04-15 15:17:19 +0000 | [diff] [blame] | 1341 | neigh_dbg(1, "%s: dst=%p neigh=%p\n", __func__, dst, neigh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1342 | out_kfree_skb: |
| 1343 | rc = -EINVAL; |
| 1344 | kfree_skb(skb); |
| 1345 | goto out; |
| 1346 | } |
YOSHIFUJI Hideaki | 0a20450 | 2008-03-24 18:39:10 +0900 | [diff] [blame] | 1347 | EXPORT_SYMBOL(neigh_resolve_output); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1348 | |
| 1349 | /* As fast as possible without hh cache */ |
| 1350 | |
David S. Miller | 8f40b16 | 2011-07-17 13:34:11 -0700 | [diff] [blame] | 1351 | int neigh_connected_output(struct neighbour *neigh, struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1352 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1353 | struct net_device *dev = neigh->dev; |
Eric Dumazet | 0ed8ddf | 2010-10-07 10:44:07 +0000 | [diff] [blame] | 1354 | unsigned int seq; |
David S. Miller | 8f40b16 | 2011-07-17 13:34:11 -0700 | [diff] [blame] | 1355 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1356 | |
Eric Dumazet | 0ed8ddf | 2010-10-07 10:44:07 +0000 | [diff] [blame] | 1357 | do { |
ramesh.nagappa@gmail.com | e1f1650 | 2012-10-05 19:10:15 +0000 | [diff] [blame] | 1358 | __skb_pull(skb, skb_network_offset(skb)); |
Eric Dumazet | 0ed8ddf | 2010-10-07 10:44:07 +0000 | [diff] [blame] | 1359 | seq = read_seqbegin(&neigh->ha_lock); |
| 1360 | err = dev_hard_header(skb, dev, ntohs(skb->protocol), |
| 1361 | neigh->ha, NULL, skb->len); |
| 1362 | } while (read_seqretry(&neigh->ha_lock, seq)); |
| 1363 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1364 | if (err >= 0) |
David S. Miller | 542d4d6 | 2011-07-16 18:06:24 -0700 | [diff] [blame] | 1365 | err = dev_queue_xmit(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1366 | else { |
| 1367 | err = -EINVAL; |
| 1368 | kfree_skb(skb); |
| 1369 | } |
| 1370 | return err; |
| 1371 | } |
YOSHIFUJI Hideaki | 0a20450 | 2008-03-24 18:39:10 +0900 | [diff] [blame] | 1372 | EXPORT_SYMBOL(neigh_connected_output); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1373 | |
David S. Miller | 8f40b16 | 2011-07-17 13:34:11 -0700 | [diff] [blame] | 1374 | int neigh_direct_output(struct neighbour *neigh, struct sk_buff *skb) |
| 1375 | { |
| 1376 | return dev_queue_xmit(skb); |
| 1377 | } |
| 1378 | EXPORT_SYMBOL(neigh_direct_output); |
| 1379 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1380 | static void neigh_proxy_process(unsigned long arg) |
| 1381 | { |
| 1382 | struct neigh_table *tbl = (struct neigh_table *)arg; |
| 1383 | long sched_next = 0; |
| 1384 | unsigned long now = jiffies; |
David S. Miller | f72051b | 2008-09-23 01:11:18 -0700 | [diff] [blame] | 1385 | struct sk_buff *skb, *n; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1386 | |
| 1387 | spin_lock(&tbl->proxy_queue.lock); |
| 1388 | |
David S. Miller | f72051b | 2008-09-23 01:11:18 -0700 | [diff] [blame] | 1389 | skb_queue_walk_safe(&tbl->proxy_queue, skb, n) { |
| 1390 | long tdif = NEIGH_CB(skb)->sched_next - now; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1391 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1392 | if (tdif <= 0) { |
David S. Miller | f72051b | 2008-09-23 01:11:18 -0700 | [diff] [blame] | 1393 | struct net_device *dev = skb->dev; |
Eric Dumazet | 20e6074 | 2011-08-22 19:32:42 +0000 | [diff] [blame] | 1394 | |
David S. Miller | f72051b | 2008-09-23 01:11:18 -0700 | [diff] [blame] | 1395 | __skb_unlink(skb, &tbl->proxy_queue); |
Eric Dumazet | 20e6074 | 2011-08-22 19:32:42 +0000 | [diff] [blame] | 1396 | if (tbl->proxy_redo && netif_running(dev)) { |
| 1397 | rcu_read_lock(); |
David S. Miller | f72051b | 2008-09-23 01:11:18 -0700 | [diff] [blame] | 1398 | tbl->proxy_redo(skb); |
Eric Dumazet | 20e6074 | 2011-08-22 19:32:42 +0000 | [diff] [blame] | 1399 | rcu_read_unlock(); |
| 1400 | } else { |
David S. Miller | f72051b | 2008-09-23 01:11:18 -0700 | [diff] [blame] | 1401 | kfree_skb(skb); |
Eric Dumazet | 20e6074 | 2011-08-22 19:32:42 +0000 | [diff] [blame] | 1402 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1403 | |
| 1404 | dev_put(dev); |
| 1405 | } else if (!sched_next || tdif < sched_next) |
| 1406 | sched_next = tdif; |
| 1407 | } |
| 1408 | del_timer(&tbl->proxy_timer); |
| 1409 | if (sched_next) |
| 1410 | mod_timer(&tbl->proxy_timer, jiffies + sched_next); |
| 1411 | spin_unlock(&tbl->proxy_queue.lock); |
| 1412 | } |
| 1413 | |
| 1414 | void pneigh_enqueue(struct neigh_table *tbl, struct neigh_parms *p, |
| 1415 | struct sk_buff *skb) |
| 1416 | { |
| 1417 | unsigned long now = jiffies; |
Aruna-Hewapathirane | 63862b5 | 2014-01-11 07:15:59 -0500 | [diff] [blame] | 1418 | |
| 1419 | unsigned long sched_next = now + (prandom_u32() % |
Jiri Pirko | 1f9248e5 | 2013-12-07 19:26:53 +0100 | [diff] [blame] | 1420 | NEIGH_VAR(p, PROXY_DELAY)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1421 | |
Jiri Pirko | 1f9248e5 | 2013-12-07 19:26:53 +0100 | [diff] [blame] | 1422 | if (tbl->proxy_queue.qlen > NEIGH_VAR(p, PROXY_QLEN)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1423 | kfree_skb(skb); |
| 1424 | return; |
| 1425 | } |
Patrick McHardy | a61bbcf | 2005-08-14 17:24:31 -0700 | [diff] [blame] | 1426 | |
| 1427 | NEIGH_CB(skb)->sched_next = sched_next; |
| 1428 | NEIGH_CB(skb)->flags |= LOCALLY_ENQUEUED; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1429 | |
| 1430 | spin_lock(&tbl->proxy_queue.lock); |
| 1431 | if (del_timer(&tbl->proxy_timer)) { |
| 1432 | if (time_before(tbl->proxy_timer.expires, sched_next)) |
| 1433 | sched_next = tbl->proxy_timer.expires; |
| 1434 | } |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 1435 | skb_dst_drop(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1436 | dev_hold(skb->dev); |
| 1437 | __skb_queue_tail(&tbl->proxy_queue, skb); |
| 1438 | mod_timer(&tbl->proxy_timer, sched_next); |
| 1439 | spin_unlock(&tbl->proxy_queue.lock); |
| 1440 | } |
YOSHIFUJI Hideaki | 0a20450 | 2008-03-24 18:39:10 +0900 | [diff] [blame] | 1441 | EXPORT_SYMBOL(pneigh_enqueue); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1442 | |
Tobias Klauser | 97fd5bc | 2009-07-13 11:17:49 -0700 | [diff] [blame] | 1443 | 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] | 1444 | struct net *net, int ifindex) |
| 1445 | { |
| 1446 | struct neigh_parms *p; |
| 1447 | |
| 1448 | for (p = &tbl->parms; p; p = p->next) { |
YOSHIFUJI Hideaki | 878628f | 2008-03-26 03:57:35 +0900 | [diff] [blame] | 1449 | 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] | 1450 | (!p->dev && !ifindex && net_eq(net, &init_net))) |
Eric W. Biederman | 426b530 | 2008-01-24 00:13:18 -0800 | [diff] [blame] | 1451 | return p; |
| 1452 | } |
| 1453 | |
| 1454 | return NULL; |
| 1455 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1456 | |
| 1457 | struct neigh_parms *neigh_parms_alloc(struct net_device *dev, |
| 1458 | struct neigh_table *tbl) |
| 1459 | { |
Gao feng | cf89d6b | 2013-06-20 10:01:32 +0800 | [diff] [blame] | 1460 | struct neigh_parms *p; |
Stephen Hemminger | 0082982 | 2008-11-20 20:14:53 -0800 | [diff] [blame] | 1461 | struct net *net = dev_net(dev); |
| 1462 | const struct net_device_ops *ops = dev->netdev_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1463 | |
Gao feng | cf89d6b | 2013-06-20 10:01:32 +0800 | [diff] [blame] | 1464 | p = kmemdup(&tbl->parms, sizeof(*p), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1465 | if (p) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1466 | p->tbl = tbl; |
| 1467 | atomic_set(&p->refcnt, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1468 | p->reachable_time = |
Jiri Pirko | 1f9248e5 | 2013-12-07 19:26:53 +0100 | [diff] [blame] | 1469 | neigh_rand_reach_time(NEIGH_VAR(p, BASE_REACHABLE_TIME)); |
Denis V. Lunev | 486b51d | 2008-01-14 22:59:59 -0800 | [diff] [blame] | 1470 | dev_hold(dev); |
| 1471 | p->dev = dev; |
Eric Dumazet | e42ea98 | 2008-11-12 00:54:54 -0800 | [diff] [blame] | 1472 | write_pnet(&p->net, hold_net(net)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1473 | p->sysctl_table = NULL; |
Veaceslav Falico | 6313480 | 2013-08-02 19:07:38 +0200 | [diff] [blame] | 1474 | |
| 1475 | if (ops->ndo_neigh_setup && ops->ndo_neigh_setup(dev, p)) { |
| 1476 | release_net(net); |
| 1477 | dev_put(dev); |
| 1478 | kfree(p); |
| 1479 | return NULL; |
| 1480 | } |
| 1481 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1482 | write_lock_bh(&tbl->lock); |
| 1483 | p->next = tbl->parms.next; |
| 1484 | tbl->parms.next = p; |
| 1485 | write_unlock_bh(&tbl->lock); |
Jiri Pirko | 1d4c8c2 | 2013-12-07 19:26:56 +0100 | [diff] [blame] | 1486 | |
| 1487 | neigh_parms_data_state_cleanall(p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1488 | } |
| 1489 | return p; |
| 1490 | } |
YOSHIFUJI Hideaki | 0a20450 | 2008-03-24 18:39:10 +0900 | [diff] [blame] | 1491 | EXPORT_SYMBOL(neigh_parms_alloc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1492 | |
| 1493 | static void neigh_rcu_free_parms(struct rcu_head *head) |
| 1494 | { |
| 1495 | struct neigh_parms *parms = |
| 1496 | container_of(head, struct neigh_parms, rcu_head); |
| 1497 | |
| 1498 | neigh_parms_put(parms); |
| 1499 | } |
| 1500 | |
| 1501 | void neigh_parms_release(struct neigh_table *tbl, struct neigh_parms *parms) |
| 1502 | { |
| 1503 | struct neigh_parms **p; |
| 1504 | |
| 1505 | if (!parms || parms == &tbl->parms) |
| 1506 | return; |
| 1507 | write_lock_bh(&tbl->lock); |
| 1508 | for (p = &tbl->parms.next; *p; p = &(*p)->next) { |
| 1509 | if (*p == parms) { |
| 1510 | *p = parms->next; |
| 1511 | parms->dead = 1; |
| 1512 | write_unlock_bh(&tbl->lock); |
David S. Miller | cecbb63 | 2008-01-20 16:39:03 -0800 | [diff] [blame] | 1513 | if (parms->dev) |
| 1514 | dev_put(parms->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1515 | call_rcu(&parms->rcu_head, neigh_rcu_free_parms); |
| 1516 | return; |
| 1517 | } |
| 1518 | } |
| 1519 | write_unlock_bh(&tbl->lock); |
Joe Perches | d5d427c | 2013-04-15 15:17:19 +0000 | [diff] [blame] | 1520 | neigh_dbg(1, "%s: not found\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1521 | } |
YOSHIFUJI Hideaki | 0a20450 | 2008-03-24 18:39:10 +0900 | [diff] [blame] | 1522 | EXPORT_SYMBOL(neigh_parms_release); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1523 | |
Denis V. Lunev | 06f0511 | 2008-01-24 00:30:58 -0800 | [diff] [blame] | 1524 | static void neigh_parms_destroy(struct neigh_parms *parms) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1525 | { |
YOSHIFUJI Hideaki | 57da52c | 2008-03-26 03:49:59 +0900 | [diff] [blame] | 1526 | release_net(neigh_parms_net(parms)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1527 | kfree(parms); |
| 1528 | } |
| 1529 | |
Pavel Emelianov | c2ecba7 | 2007-04-17 12:45:31 -0700 | [diff] [blame] | 1530 | static struct lock_class_key neigh_table_proxy_queue_class; |
| 1531 | |
Hiroaki SHIMODA | dcd2ba9 | 2012-04-13 07:34:44 +0000 | [diff] [blame] | 1532 | static void neigh_table_init_no_netlink(struct neigh_table *tbl) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1533 | { |
| 1534 | unsigned long now = jiffies; |
| 1535 | unsigned long phsize; |
| 1536 | |
Eric Dumazet | e42ea98 | 2008-11-12 00:54:54 -0800 | [diff] [blame] | 1537 | write_pnet(&tbl->parms.net, &init_net); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1538 | atomic_set(&tbl->parms.refcnt, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1539 | tbl->parms.reachable_time = |
Jiri Pirko | 1f9248e5 | 2013-12-07 19:26:53 +0100 | [diff] [blame] | 1540 | neigh_rand_reach_time(NEIGH_VAR(&tbl->parms, BASE_REACHABLE_TIME)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1541 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1542 | tbl->stats = alloc_percpu(struct neigh_statistics); |
| 1543 | if (!tbl->stats) |
| 1544 | panic("cannot create neighbour cache statistics"); |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1545 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1546 | #ifdef CONFIG_PROC_FS |
Alexey Dobriyan | 9b739ba | 2008-11-11 16:47:44 -0800 | [diff] [blame] | 1547 | if (!proc_create_data(tbl->id, 0, init_net.proc_net_stat, |
| 1548 | &neigh_stat_seq_fops, tbl)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1549 | panic("cannot create neighbour proc dir entry"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1550 | #endif |
| 1551 | |
David S. Miller | cd08933 | 2011-07-11 01:28:12 -0700 | [diff] [blame] | 1552 | RCU_INIT_POINTER(tbl->nht, neigh_hash_alloc(3)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1553 | |
| 1554 | phsize = (PNEIGH_HASHMASK + 1) * sizeof(struct pneigh_entry *); |
Andrew Morton | 77d04bd | 2006-04-07 14:52:59 -0700 | [diff] [blame] | 1555 | tbl->phash_buckets = kzalloc(phsize, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1556 | |
Eric Dumazet | d6bf781 | 2010-10-04 06:15:44 +0000 | [diff] [blame] | 1557 | if (!tbl->nht || !tbl->phash_buckets) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1558 | panic("cannot allocate neighbour cache hashes"); |
| 1559 | |
YOSHIFUJI Hideaki / 吉藤英明 | 08433ef | 2013-01-24 00:44:23 +0000 | [diff] [blame] | 1560 | if (!tbl->entry_size) |
| 1561 | tbl->entry_size = ALIGN(offsetof(struct neighbour, primary_key) + |
| 1562 | tbl->key_len, NEIGH_PRIV_ALIGN); |
| 1563 | else |
| 1564 | WARN_ON(tbl->entry_size % NEIGH_PRIV_ALIGN); |
| 1565 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1566 | rwlock_init(&tbl->lock); |
Tejun Heo | 203b42f | 2012-08-21 13:18:23 -0700 | [diff] [blame] | 1567 | INIT_DEFERRABLE_WORK(&tbl->gc_work, neigh_periodic_work); |
viresh kumar | f618002 | 2014-01-22 12:23:33 +0530 | [diff] [blame] | 1568 | queue_delayed_work(system_power_efficient_wq, &tbl->gc_work, |
| 1569 | tbl->parms.reachable_time); |
Pavel Emelyanov | b24b8a2 | 2008-01-23 21:20:07 -0800 | [diff] [blame] | 1570 | setup_timer(&tbl->proxy_timer, neigh_proxy_process, (unsigned long)tbl); |
Pavel Emelianov | c2ecba7 | 2007-04-17 12:45:31 -0700 | [diff] [blame] | 1571 | skb_queue_head_init_class(&tbl->proxy_queue, |
| 1572 | &neigh_table_proxy_queue_class); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1573 | |
| 1574 | tbl->last_flush = now; |
| 1575 | tbl->last_rand = now + tbl->parms.reachable_time * 20; |
Simon Kelley | bd89efc | 2006-05-12 14:56:08 -0700 | [diff] [blame] | 1576 | } |
| 1577 | |
| 1578 | void neigh_table_init(struct neigh_table *tbl) |
| 1579 | { |
| 1580 | struct neigh_table *tmp; |
| 1581 | |
| 1582 | neigh_table_init_no_netlink(tbl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1583 | write_lock(&neigh_tbl_lock); |
Simon Kelley | bd89efc | 2006-05-12 14:56:08 -0700 | [diff] [blame] | 1584 | for (tmp = neigh_tables; tmp; tmp = tmp->next) { |
| 1585 | if (tmp->family == tbl->family) |
| 1586 | break; |
| 1587 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1588 | tbl->next = neigh_tables; |
| 1589 | neigh_tables = tbl; |
| 1590 | write_unlock(&neigh_tbl_lock); |
Simon Kelley | bd89efc | 2006-05-12 14:56:08 -0700 | [diff] [blame] | 1591 | |
| 1592 | if (unlikely(tmp)) { |
Joe Perches | e005d19 | 2012-05-16 19:58:40 +0000 | [diff] [blame] | 1593 | pr_err("Registering multiple tables for family %d\n", |
| 1594 | tbl->family); |
Simon Kelley | bd89efc | 2006-05-12 14:56:08 -0700 | [diff] [blame] | 1595 | dump_stack(); |
| 1596 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1597 | } |
YOSHIFUJI Hideaki | 0a20450 | 2008-03-24 18:39:10 +0900 | [diff] [blame] | 1598 | EXPORT_SYMBOL(neigh_table_init); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1599 | |
| 1600 | int neigh_table_clear(struct neigh_table *tbl) |
| 1601 | { |
| 1602 | struct neigh_table **tp; |
| 1603 | |
| 1604 | /* It is not clean... Fix it to unload IPv6 module safely */ |
Tejun Heo | a5c30b3 | 2010-10-19 06:04:42 +0000 | [diff] [blame] | 1605 | cancel_delayed_work_sync(&tbl->gc_work); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1606 | del_timer_sync(&tbl->proxy_timer); |
| 1607 | pneigh_queue_purge(&tbl->proxy_queue); |
| 1608 | neigh_ifdown(tbl, NULL); |
| 1609 | if (atomic_read(&tbl->entries)) |
Joe Perches | e005d19 | 2012-05-16 19:58:40 +0000 | [diff] [blame] | 1610 | pr_crit("neighbour leakage\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1611 | write_lock(&neigh_tbl_lock); |
| 1612 | for (tp = &neigh_tables; *tp; tp = &(*tp)->next) { |
| 1613 | if (*tp == tbl) { |
| 1614 | *tp = tbl->next; |
| 1615 | break; |
| 1616 | } |
| 1617 | } |
| 1618 | write_unlock(&neigh_tbl_lock); |
| 1619 | |
Eric Dumazet | 6193d2b | 2011-01-19 22:02:47 +0000 | [diff] [blame] | 1620 | call_rcu(&rcu_dereference_protected(tbl->nht, 1)->rcu, |
| 1621 | neigh_hash_free_rcu); |
Eric Dumazet | d6bf781 | 2010-10-04 06:15:44 +0000 | [diff] [blame] | 1622 | tbl->nht = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1623 | |
| 1624 | kfree(tbl->phash_buckets); |
| 1625 | tbl->phash_buckets = NULL; |
| 1626 | |
Alexey Dobriyan | 3f192b5 | 2007-11-05 21:28:13 -0800 | [diff] [blame] | 1627 | remove_proc_entry(tbl->id, init_net.proc_net_stat); |
| 1628 | |
Kirill Korotaev | 3fcde74 | 2006-09-01 01:34:10 -0700 | [diff] [blame] | 1629 | free_percpu(tbl->stats); |
| 1630 | tbl->stats = NULL; |
| 1631 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1632 | return 0; |
| 1633 | } |
YOSHIFUJI Hideaki | 0a20450 | 2008-03-24 18:39:10 +0900 | [diff] [blame] | 1634 | EXPORT_SYMBOL(neigh_table_clear); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1635 | |
Thomas Graf | 661d296 | 2013-03-21 07:45:29 +0000 | [diff] [blame] | 1636 | static int neigh_delete(struct sk_buff *skb, struct nlmsghdr *nlh) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1637 | { |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1638 | struct net *net = sock_net(skb->sk); |
Thomas Graf | a14a49d | 2006-08-07 17:53:08 -0700 | [diff] [blame] | 1639 | struct ndmsg *ndm; |
| 1640 | struct nlattr *dst_attr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1641 | struct neigh_table *tbl; |
| 1642 | struct net_device *dev = NULL; |
Thomas Graf | a14a49d | 2006-08-07 17:53:08 -0700 | [diff] [blame] | 1643 | int err = -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1644 | |
Eric Dumazet | 110b249 | 2010-10-04 04:27:36 +0000 | [diff] [blame] | 1645 | ASSERT_RTNL(); |
Thomas Graf | a14a49d | 2006-08-07 17:53:08 -0700 | [diff] [blame] | 1646 | if (nlmsg_len(nlh) < sizeof(*ndm)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1647 | goto out; |
| 1648 | |
Thomas Graf | a14a49d | 2006-08-07 17:53:08 -0700 | [diff] [blame] | 1649 | dst_attr = nlmsg_find_attr(nlh, sizeof(*ndm), NDA_DST); |
| 1650 | if (dst_attr == NULL) |
| 1651 | goto out; |
| 1652 | |
| 1653 | ndm = nlmsg_data(nlh); |
| 1654 | if (ndm->ndm_ifindex) { |
Eric Dumazet | 110b249 | 2010-10-04 04:27:36 +0000 | [diff] [blame] | 1655 | dev = __dev_get_by_index(net, ndm->ndm_ifindex); |
Thomas Graf | a14a49d | 2006-08-07 17:53:08 -0700 | [diff] [blame] | 1656 | if (dev == NULL) { |
| 1657 | err = -ENODEV; |
| 1658 | goto out; |
| 1659 | } |
| 1660 | } |
| 1661 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1662 | read_lock(&neigh_tbl_lock); |
| 1663 | for (tbl = neigh_tables; tbl; tbl = tbl->next) { |
Thomas Graf | a14a49d | 2006-08-07 17:53:08 -0700 | [diff] [blame] | 1664 | struct neighbour *neigh; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1665 | |
| 1666 | if (tbl->family != ndm->ndm_family) |
| 1667 | continue; |
| 1668 | read_unlock(&neigh_tbl_lock); |
| 1669 | |
Thomas Graf | a14a49d | 2006-08-07 17:53:08 -0700 | [diff] [blame] | 1670 | if (nla_len(dst_attr) < tbl->key_len) |
Eric Dumazet | 110b249 | 2010-10-04 04:27:36 +0000 | [diff] [blame] | 1671 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1672 | |
| 1673 | if (ndm->ndm_flags & NTF_PROXY) { |
Eric W. Biederman | 426b530 | 2008-01-24 00:13:18 -0800 | [diff] [blame] | 1674 | err = pneigh_delete(tbl, net, nla_data(dst_attr), dev); |
Eric Dumazet | 110b249 | 2010-10-04 04:27:36 +0000 | [diff] [blame] | 1675 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1676 | } |
| 1677 | |
Thomas Graf | a14a49d | 2006-08-07 17:53:08 -0700 | [diff] [blame] | 1678 | if (dev == NULL) |
Eric Dumazet | 110b249 | 2010-10-04 04:27:36 +0000 | [diff] [blame] | 1679 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1680 | |
Thomas Graf | a14a49d | 2006-08-07 17:53:08 -0700 | [diff] [blame] | 1681 | neigh = neigh_lookup(tbl, nla_data(dst_attr), dev); |
| 1682 | if (neigh == NULL) { |
| 1683 | err = -ENOENT; |
Eric Dumazet | 110b249 | 2010-10-04 04:27:36 +0000 | [diff] [blame] | 1684 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1685 | } |
Thomas Graf | a14a49d | 2006-08-07 17:53:08 -0700 | [diff] [blame] | 1686 | |
| 1687 | err = neigh_update(neigh, NULL, NUD_FAILED, |
| 1688 | NEIGH_UPDATE_F_OVERRIDE | |
| 1689 | NEIGH_UPDATE_F_ADMIN); |
| 1690 | neigh_release(neigh); |
Eric Dumazet | 110b249 | 2010-10-04 04:27:36 +0000 | [diff] [blame] | 1691 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1692 | } |
| 1693 | read_unlock(&neigh_tbl_lock); |
Thomas Graf | a14a49d | 2006-08-07 17:53:08 -0700 | [diff] [blame] | 1694 | err = -EAFNOSUPPORT; |
| 1695 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1696 | out: |
| 1697 | return err; |
| 1698 | } |
| 1699 | |
Thomas Graf | 661d296 | 2013-03-21 07:45:29 +0000 | [diff] [blame] | 1700 | static int neigh_add(struct sk_buff *skb, struct nlmsghdr *nlh) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1701 | { |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1702 | struct net *net = sock_net(skb->sk); |
Thomas Graf | 5208deb | 2006-08-07 17:55:40 -0700 | [diff] [blame] | 1703 | struct ndmsg *ndm; |
| 1704 | struct nlattr *tb[NDA_MAX+1]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1705 | struct neigh_table *tbl; |
| 1706 | struct net_device *dev = NULL; |
Thomas Graf | 5208deb | 2006-08-07 17:55:40 -0700 | [diff] [blame] | 1707 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1708 | |
Eric Dumazet | 110b249 | 2010-10-04 04:27:36 +0000 | [diff] [blame] | 1709 | ASSERT_RTNL(); |
Thomas Graf | 5208deb | 2006-08-07 17:55:40 -0700 | [diff] [blame] | 1710 | err = nlmsg_parse(nlh, sizeof(*ndm), tb, NDA_MAX, NULL); |
| 1711 | if (err < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1712 | goto out; |
| 1713 | |
Thomas Graf | 5208deb | 2006-08-07 17:55:40 -0700 | [diff] [blame] | 1714 | err = -EINVAL; |
| 1715 | if (tb[NDA_DST] == NULL) |
| 1716 | goto out; |
| 1717 | |
| 1718 | ndm = nlmsg_data(nlh); |
| 1719 | if (ndm->ndm_ifindex) { |
Eric Dumazet | 110b249 | 2010-10-04 04:27:36 +0000 | [diff] [blame] | 1720 | dev = __dev_get_by_index(net, ndm->ndm_ifindex); |
Thomas Graf | 5208deb | 2006-08-07 17:55:40 -0700 | [diff] [blame] | 1721 | if (dev == NULL) { |
| 1722 | err = -ENODEV; |
| 1723 | goto out; |
| 1724 | } |
| 1725 | |
| 1726 | if (tb[NDA_LLADDR] && nla_len(tb[NDA_LLADDR]) < dev->addr_len) |
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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1730 | read_lock(&neigh_tbl_lock); |
| 1731 | for (tbl = neigh_tables; tbl; tbl = tbl->next) { |
Thomas Graf | 5208deb | 2006-08-07 17:55:40 -0700 | [diff] [blame] | 1732 | int flags = NEIGH_UPDATE_F_ADMIN | NEIGH_UPDATE_F_OVERRIDE; |
| 1733 | struct neighbour *neigh; |
| 1734 | void *dst, *lladdr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1735 | |
| 1736 | if (tbl->family != ndm->ndm_family) |
| 1737 | continue; |
| 1738 | read_unlock(&neigh_tbl_lock); |
| 1739 | |
Thomas Graf | 5208deb | 2006-08-07 17:55:40 -0700 | [diff] [blame] | 1740 | if (nla_len(tb[NDA_DST]) < tbl->key_len) |
Eric Dumazet | 110b249 | 2010-10-04 04:27:36 +0000 | [diff] [blame] | 1741 | goto out; |
Thomas Graf | 5208deb | 2006-08-07 17:55:40 -0700 | [diff] [blame] | 1742 | dst = nla_data(tb[NDA_DST]); |
| 1743 | lladdr = tb[NDA_LLADDR] ? nla_data(tb[NDA_LLADDR]) : NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1744 | |
| 1745 | if (ndm->ndm_flags & NTF_PROXY) { |
Ville Nuorvala | 62dd931 | 2006-09-22 14:43:19 -0700 | [diff] [blame] | 1746 | struct pneigh_entry *pn; |
| 1747 | |
| 1748 | err = -ENOBUFS; |
Eric W. Biederman | 426b530 | 2008-01-24 00:13:18 -0800 | [diff] [blame] | 1749 | pn = pneigh_lookup(tbl, net, dst, dev, 1); |
Ville Nuorvala | 62dd931 | 2006-09-22 14:43:19 -0700 | [diff] [blame] | 1750 | if (pn) { |
| 1751 | pn->flags = ndm->ndm_flags; |
| 1752 | err = 0; |
| 1753 | } |
Eric Dumazet | 110b249 | 2010-10-04 04:27:36 +0000 | [diff] [blame] | 1754 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1755 | } |
| 1756 | |
Thomas Graf | 5208deb | 2006-08-07 17:55:40 -0700 | [diff] [blame] | 1757 | if (dev == NULL) |
Eric Dumazet | 110b249 | 2010-10-04 04:27:36 +0000 | [diff] [blame] | 1758 | goto out; |
Thomas Graf | 5208deb | 2006-08-07 17:55:40 -0700 | [diff] [blame] | 1759 | |
| 1760 | neigh = neigh_lookup(tbl, dst, dev); |
| 1761 | if (neigh == NULL) { |
| 1762 | if (!(nlh->nlmsg_flags & NLM_F_CREATE)) { |
| 1763 | err = -ENOENT; |
Eric Dumazet | 110b249 | 2010-10-04 04:27:36 +0000 | [diff] [blame] | 1764 | goto out; |
Thomas Graf | 5208deb | 2006-08-07 17:55:40 -0700 | [diff] [blame] | 1765 | } |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1766 | |
Thomas Graf | 5208deb | 2006-08-07 17:55:40 -0700 | [diff] [blame] | 1767 | neigh = __neigh_lookup_errno(tbl, dst, dev); |
| 1768 | if (IS_ERR(neigh)) { |
| 1769 | err = PTR_ERR(neigh); |
Eric Dumazet | 110b249 | 2010-10-04 04:27:36 +0000 | [diff] [blame] | 1770 | goto out; |
Thomas Graf | 5208deb | 2006-08-07 17:55:40 -0700 | [diff] [blame] | 1771 | } |
| 1772 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1773 | if (nlh->nlmsg_flags & NLM_F_EXCL) { |
| 1774 | err = -EEXIST; |
Thomas Graf | 5208deb | 2006-08-07 17:55:40 -0700 | [diff] [blame] | 1775 | neigh_release(neigh); |
Eric Dumazet | 110b249 | 2010-10-04 04:27:36 +0000 | [diff] [blame] | 1776 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1777 | } |
Thomas Graf | 5208deb | 2006-08-07 17:55:40 -0700 | [diff] [blame] | 1778 | |
| 1779 | if (!(nlh->nlmsg_flags & NLM_F_REPLACE)) |
| 1780 | flags &= ~NEIGH_UPDATE_F_OVERRIDE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1781 | } |
| 1782 | |
Eric Biederman | 0c5c2d3 | 2009-03-04 00:03:08 -0800 | [diff] [blame] | 1783 | if (ndm->ndm_flags & NTF_USE) { |
| 1784 | neigh_event_send(neigh, NULL); |
| 1785 | err = 0; |
| 1786 | } else |
| 1787 | err = neigh_update(neigh, lladdr, ndm->ndm_state, flags); |
Thomas Graf | 5208deb | 2006-08-07 17:55:40 -0700 | [diff] [blame] | 1788 | neigh_release(neigh); |
Eric Dumazet | 110b249 | 2010-10-04 04:27:36 +0000 | [diff] [blame] | 1789 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1790 | } |
| 1791 | |
| 1792 | read_unlock(&neigh_tbl_lock); |
Thomas Graf | 5208deb | 2006-08-07 17:55:40 -0700 | [diff] [blame] | 1793 | err = -EAFNOSUPPORT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1794 | out: |
| 1795 | return err; |
| 1796 | } |
| 1797 | |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1798 | static int neightbl_fill_parms(struct sk_buff *skb, struct neigh_parms *parms) |
| 1799 | { |
Thomas Graf | ca860fb | 2006-08-07 18:00:18 -0700 | [diff] [blame] | 1800 | struct nlattr *nest; |
| 1801 | |
| 1802 | nest = nla_nest_start(skb, NDTA_PARMS); |
| 1803 | if (nest == NULL) |
| 1804 | return -ENOBUFS; |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1805 | |
David S. Miller | 9a6308d | 2012-04-01 20:06:28 -0400 | [diff] [blame] | 1806 | if ((parms->dev && |
| 1807 | nla_put_u32(skb, NDTPA_IFINDEX, parms->dev->ifindex)) || |
| 1808 | nla_put_u32(skb, NDTPA_REFCNT, atomic_read(&parms->refcnt)) || |
Jiri Pirko | 1f9248e5 | 2013-12-07 19:26:53 +0100 | [diff] [blame] | 1809 | nla_put_u32(skb, NDTPA_QUEUE_LENBYTES, |
| 1810 | NEIGH_VAR(parms, QUEUE_LEN_BYTES)) || |
David S. Miller | 9a6308d | 2012-04-01 20:06:28 -0400 | [diff] [blame] | 1811 | /* approximative value for deprecated QUEUE_LEN (in packets) */ |
| 1812 | nla_put_u32(skb, NDTPA_QUEUE_LEN, |
Jiri Pirko | 1f9248e5 | 2013-12-07 19:26:53 +0100 | [diff] [blame] | 1813 | NEIGH_VAR(parms, QUEUE_LEN_BYTES) / SKB_TRUESIZE(ETH_FRAME_LEN)) || |
| 1814 | nla_put_u32(skb, NDTPA_PROXY_QLEN, NEIGH_VAR(parms, PROXY_QLEN)) || |
| 1815 | nla_put_u32(skb, NDTPA_APP_PROBES, NEIGH_VAR(parms, APP_PROBES)) || |
| 1816 | nla_put_u32(skb, NDTPA_UCAST_PROBES, |
| 1817 | NEIGH_VAR(parms, UCAST_PROBES)) || |
| 1818 | nla_put_u32(skb, NDTPA_MCAST_PROBES, |
| 1819 | NEIGH_VAR(parms, MCAST_PROBES)) || |
David S. Miller | 9a6308d | 2012-04-01 20:06:28 -0400 | [diff] [blame] | 1820 | nla_put_msecs(skb, NDTPA_REACHABLE_TIME, parms->reachable_time) || |
| 1821 | nla_put_msecs(skb, NDTPA_BASE_REACHABLE_TIME, |
Jiri Pirko | 1f9248e5 | 2013-12-07 19:26:53 +0100 | [diff] [blame] | 1822 | NEIGH_VAR(parms, BASE_REACHABLE_TIME)) || |
| 1823 | nla_put_msecs(skb, NDTPA_GC_STALETIME, |
| 1824 | NEIGH_VAR(parms, GC_STALETIME)) || |
David S. Miller | 9a6308d | 2012-04-01 20:06:28 -0400 | [diff] [blame] | 1825 | nla_put_msecs(skb, NDTPA_DELAY_PROBE_TIME, |
Jiri Pirko | 1f9248e5 | 2013-12-07 19:26:53 +0100 | [diff] [blame] | 1826 | NEIGH_VAR(parms, DELAY_PROBE_TIME)) || |
| 1827 | nla_put_msecs(skb, NDTPA_RETRANS_TIME, |
| 1828 | NEIGH_VAR(parms, RETRANS_TIME)) || |
| 1829 | nla_put_msecs(skb, NDTPA_ANYCAST_DELAY, |
| 1830 | NEIGH_VAR(parms, ANYCAST_DELAY)) || |
| 1831 | nla_put_msecs(skb, NDTPA_PROXY_DELAY, |
| 1832 | NEIGH_VAR(parms, PROXY_DELAY)) || |
| 1833 | nla_put_msecs(skb, NDTPA_LOCKTIME, |
| 1834 | NEIGH_VAR(parms, LOCKTIME))) |
David S. Miller | 9a6308d | 2012-04-01 20:06:28 -0400 | [diff] [blame] | 1835 | goto nla_put_failure; |
Thomas Graf | ca860fb | 2006-08-07 18:00:18 -0700 | [diff] [blame] | 1836 | return nla_nest_end(skb, nest); |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1837 | |
Thomas Graf | ca860fb | 2006-08-07 18:00:18 -0700 | [diff] [blame] | 1838 | nla_put_failure: |
Thomas Graf | bc3ed28 | 2008-06-03 16:36:54 -0700 | [diff] [blame] | 1839 | nla_nest_cancel(skb, nest); |
| 1840 | return -EMSGSIZE; |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1841 | } |
| 1842 | |
Thomas Graf | ca860fb | 2006-08-07 18:00:18 -0700 | [diff] [blame] | 1843 | static int neightbl_fill_info(struct sk_buff *skb, struct neigh_table *tbl, |
| 1844 | u32 pid, u32 seq, int type, int flags) |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1845 | { |
| 1846 | struct nlmsghdr *nlh; |
| 1847 | struct ndtmsg *ndtmsg; |
| 1848 | |
Thomas Graf | ca860fb | 2006-08-07 18:00:18 -0700 | [diff] [blame] | 1849 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndtmsg), flags); |
| 1850 | if (nlh == NULL) |
Patrick McHardy | 2693256 | 2007-01-31 23:16:40 -0800 | [diff] [blame] | 1851 | return -EMSGSIZE; |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1852 | |
Thomas Graf | ca860fb | 2006-08-07 18:00:18 -0700 | [diff] [blame] | 1853 | ndtmsg = nlmsg_data(nlh); |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1854 | |
| 1855 | read_lock_bh(&tbl->lock); |
| 1856 | ndtmsg->ndtm_family = tbl->family; |
Patrick McHardy | 9ef1d4c | 2005-06-28 12:55:30 -0700 | [diff] [blame] | 1857 | ndtmsg->ndtm_pad1 = 0; |
| 1858 | ndtmsg->ndtm_pad2 = 0; |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1859 | |
David S. Miller | 9a6308d | 2012-04-01 20:06:28 -0400 | [diff] [blame] | 1860 | if (nla_put_string(skb, NDTA_NAME, tbl->id) || |
| 1861 | nla_put_msecs(skb, NDTA_GC_INTERVAL, tbl->gc_interval) || |
| 1862 | nla_put_u32(skb, NDTA_THRESH1, tbl->gc_thresh1) || |
| 1863 | nla_put_u32(skb, NDTA_THRESH2, tbl->gc_thresh2) || |
| 1864 | nla_put_u32(skb, NDTA_THRESH3, tbl->gc_thresh3)) |
| 1865 | goto nla_put_failure; |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1866 | { |
| 1867 | unsigned long now = jiffies; |
| 1868 | unsigned int flush_delta = now - tbl->last_flush; |
| 1869 | unsigned int rand_delta = now - tbl->last_rand; |
Eric Dumazet | d6bf781 | 2010-10-04 06:15:44 +0000 | [diff] [blame] | 1870 | struct neigh_hash_table *nht; |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1871 | struct ndt_config ndc = { |
| 1872 | .ndtc_key_len = tbl->key_len, |
| 1873 | .ndtc_entry_size = tbl->entry_size, |
| 1874 | .ndtc_entries = atomic_read(&tbl->entries), |
| 1875 | .ndtc_last_flush = jiffies_to_msecs(flush_delta), |
| 1876 | .ndtc_last_rand = jiffies_to_msecs(rand_delta), |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1877 | .ndtc_proxy_qlen = tbl->proxy_queue.qlen, |
| 1878 | }; |
| 1879 | |
Eric Dumazet | d6bf781 | 2010-10-04 06:15:44 +0000 | [diff] [blame] | 1880 | rcu_read_lock_bh(); |
| 1881 | nht = rcu_dereference_bh(tbl->nht); |
David S. Miller | 2c2aba6 | 2011-12-28 15:06:58 -0500 | [diff] [blame] | 1882 | ndc.ndtc_hash_rnd = nht->hash_rnd[0]; |
David S. Miller | cd08933 | 2011-07-11 01:28:12 -0700 | [diff] [blame] | 1883 | ndc.ndtc_hash_mask = ((1 << nht->hash_shift) - 1); |
Eric Dumazet | d6bf781 | 2010-10-04 06:15:44 +0000 | [diff] [blame] | 1884 | rcu_read_unlock_bh(); |
| 1885 | |
David S. Miller | 9a6308d | 2012-04-01 20:06:28 -0400 | [diff] [blame] | 1886 | if (nla_put(skb, NDTA_CONFIG, sizeof(ndc), &ndc)) |
| 1887 | goto nla_put_failure; |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1888 | } |
| 1889 | |
| 1890 | { |
| 1891 | int cpu; |
| 1892 | struct ndt_stats ndst; |
| 1893 | |
| 1894 | memset(&ndst, 0, sizeof(ndst)); |
| 1895 | |
KAMEZAWA Hiroyuki | 6f91204 | 2006-04-10 22:52:50 -0700 | [diff] [blame] | 1896 | for_each_possible_cpu(cpu) { |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1897 | struct neigh_statistics *st; |
| 1898 | |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1899 | st = per_cpu_ptr(tbl->stats, cpu); |
| 1900 | ndst.ndts_allocs += st->allocs; |
| 1901 | ndst.ndts_destroys += st->destroys; |
| 1902 | ndst.ndts_hash_grows += st->hash_grows; |
| 1903 | ndst.ndts_res_failed += st->res_failed; |
| 1904 | ndst.ndts_lookups += st->lookups; |
| 1905 | ndst.ndts_hits += st->hits; |
| 1906 | ndst.ndts_rcv_probes_mcast += st->rcv_probes_mcast; |
| 1907 | ndst.ndts_rcv_probes_ucast += st->rcv_probes_ucast; |
| 1908 | ndst.ndts_periodic_gc_runs += st->periodic_gc_runs; |
| 1909 | ndst.ndts_forced_gc_runs += st->forced_gc_runs; |
| 1910 | } |
| 1911 | |
David S. Miller | 9a6308d | 2012-04-01 20:06:28 -0400 | [diff] [blame] | 1912 | if (nla_put(skb, NDTA_STATS, sizeof(ndst), &ndst)) |
| 1913 | goto nla_put_failure; |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1914 | } |
| 1915 | |
| 1916 | BUG_ON(tbl->parms.dev); |
| 1917 | if (neightbl_fill_parms(skb, &tbl->parms) < 0) |
Thomas Graf | ca860fb | 2006-08-07 18:00:18 -0700 | [diff] [blame] | 1918 | goto nla_put_failure; |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1919 | |
| 1920 | read_unlock_bh(&tbl->lock); |
Thomas Graf | ca860fb | 2006-08-07 18:00:18 -0700 | [diff] [blame] | 1921 | return nlmsg_end(skb, nlh); |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1922 | |
Thomas Graf | ca860fb | 2006-08-07 18:00:18 -0700 | [diff] [blame] | 1923 | nla_put_failure: |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1924 | read_unlock_bh(&tbl->lock); |
Patrick McHardy | 2693256 | 2007-01-31 23:16:40 -0800 | [diff] [blame] | 1925 | nlmsg_cancel(skb, nlh); |
| 1926 | return -EMSGSIZE; |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1927 | } |
| 1928 | |
Thomas Graf | ca860fb | 2006-08-07 18:00:18 -0700 | [diff] [blame] | 1929 | static int neightbl_fill_param_info(struct sk_buff *skb, |
| 1930 | struct neigh_table *tbl, |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1931 | struct neigh_parms *parms, |
Thomas Graf | ca860fb | 2006-08-07 18:00:18 -0700 | [diff] [blame] | 1932 | u32 pid, u32 seq, int type, |
| 1933 | unsigned int flags) |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1934 | { |
| 1935 | struct ndtmsg *ndtmsg; |
| 1936 | struct nlmsghdr *nlh; |
| 1937 | |
Thomas Graf | ca860fb | 2006-08-07 18:00:18 -0700 | [diff] [blame] | 1938 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndtmsg), flags); |
| 1939 | if (nlh == NULL) |
Patrick McHardy | 2693256 | 2007-01-31 23:16:40 -0800 | [diff] [blame] | 1940 | return -EMSGSIZE; |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1941 | |
Thomas Graf | ca860fb | 2006-08-07 18:00:18 -0700 | [diff] [blame] | 1942 | ndtmsg = nlmsg_data(nlh); |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1943 | |
| 1944 | read_lock_bh(&tbl->lock); |
| 1945 | ndtmsg->ndtm_family = tbl->family; |
Patrick McHardy | 9ef1d4c | 2005-06-28 12:55:30 -0700 | [diff] [blame] | 1946 | ndtmsg->ndtm_pad1 = 0; |
| 1947 | ndtmsg->ndtm_pad2 = 0; |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1948 | |
Thomas Graf | ca860fb | 2006-08-07 18:00:18 -0700 | [diff] [blame] | 1949 | if (nla_put_string(skb, NDTA_NAME, tbl->id) < 0 || |
| 1950 | neightbl_fill_parms(skb, parms) < 0) |
| 1951 | goto errout; |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1952 | |
| 1953 | read_unlock_bh(&tbl->lock); |
Thomas Graf | ca860fb | 2006-08-07 18:00:18 -0700 | [diff] [blame] | 1954 | return nlmsg_end(skb, nlh); |
| 1955 | errout: |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1956 | read_unlock_bh(&tbl->lock); |
Patrick McHardy | 2693256 | 2007-01-31 23:16:40 -0800 | [diff] [blame] | 1957 | nlmsg_cancel(skb, nlh); |
| 1958 | return -EMSGSIZE; |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1959 | } |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 1960 | |
Patrick McHardy | ef7c79e | 2007-06-05 12:38:30 -0700 | [diff] [blame] | 1961 | static const struct nla_policy nl_neightbl_policy[NDTA_MAX+1] = { |
Thomas Graf | 6b3f867 | 2006-08-07 17:58:53 -0700 | [diff] [blame] | 1962 | [NDTA_NAME] = { .type = NLA_STRING }, |
| 1963 | [NDTA_THRESH1] = { .type = NLA_U32 }, |
| 1964 | [NDTA_THRESH2] = { .type = NLA_U32 }, |
| 1965 | [NDTA_THRESH3] = { .type = NLA_U32 }, |
| 1966 | [NDTA_GC_INTERVAL] = { .type = NLA_U64 }, |
| 1967 | [NDTA_PARMS] = { .type = NLA_NESTED }, |
| 1968 | }; |
| 1969 | |
Patrick McHardy | ef7c79e | 2007-06-05 12:38:30 -0700 | [diff] [blame] | 1970 | static const struct nla_policy nl_ntbl_parm_policy[NDTPA_MAX+1] = { |
Thomas Graf | 6b3f867 | 2006-08-07 17:58:53 -0700 | [diff] [blame] | 1971 | [NDTPA_IFINDEX] = { .type = NLA_U32 }, |
| 1972 | [NDTPA_QUEUE_LEN] = { .type = NLA_U32 }, |
| 1973 | [NDTPA_PROXY_QLEN] = { .type = NLA_U32 }, |
| 1974 | [NDTPA_APP_PROBES] = { .type = NLA_U32 }, |
| 1975 | [NDTPA_UCAST_PROBES] = { .type = NLA_U32 }, |
| 1976 | [NDTPA_MCAST_PROBES] = { .type = NLA_U32 }, |
| 1977 | [NDTPA_BASE_REACHABLE_TIME] = { .type = NLA_U64 }, |
| 1978 | [NDTPA_GC_STALETIME] = { .type = NLA_U64 }, |
| 1979 | [NDTPA_DELAY_PROBE_TIME] = { .type = NLA_U64 }, |
| 1980 | [NDTPA_RETRANS_TIME] = { .type = NLA_U64 }, |
| 1981 | [NDTPA_ANYCAST_DELAY] = { .type = NLA_U64 }, |
| 1982 | [NDTPA_PROXY_DELAY] = { .type = NLA_U64 }, |
| 1983 | [NDTPA_LOCKTIME] = { .type = NLA_U64 }, |
| 1984 | }; |
| 1985 | |
Thomas Graf | 661d296 | 2013-03-21 07:45:29 +0000 | [diff] [blame] | 1986 | static int neightbl_set(struct sk_buff *skb, struct nlmsghdr *nlh) |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1987 | { |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1988 | struct net *net = sock_net(skb->sk); |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1989 | struct neigh_table *tbl; |
Thomas Graf | 6b3f867 | 2006-08-07 17:58:53 -0700 | [diff] [blame] | 1990 | struct ndtmsg *ndtmsg; |
| 1991 | struct nlattr *tb[NDTA_MAX+1]; |
| 1992 | int err; |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1993 | |
Thomas Graf | 6b3f867 | 2006-08-07 17:58:53 -0700 | [diff] [blame] | 1994 | err = nlmsg_parse(nlh, sizeof(*ndtmsg), tb, NDTA_MAX, |
| 1995 | nl_neightbl_policy); |
| 1996 | if (err < 0) |
| 1997 | goto errout; |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 1998 | |
Thomas Graf | 6b3f867 | 2006-08-07 17:58:53 -0700 | [diff] [blame] | 1999 | if (tb[NDTA_NAME] == NULL) { |
| 2000 | err = -EINVAL; |
| 2001 | goto errout; |
| 2002 | } |
| 2003 | |
| 2004 | ndtmsg = nlmsg_data(nlh); |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 2005 | read_lock(&neigh_tbl_lock); |
| 2006 | for (tbl = neigh_tables; tbl; tbl = tbl->next) { |
| 2007 | if (ndtmsg->ndtm_family && tbl->family != ndtmsg->ndtm_family) |
| 2008 | continue; |
| 2009 | |
Thomas Graf | 6b3f867 | 2006-08-07 17:58:53 -0700 | [diff] [blame] | 2010 | if (nla_strcmp(tb[NDTA_NAME], tbl->id) == 0) |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 2011 | break; |
| 2012 | } |
| 2013 | |
| 2014 | if (tbl == NULL) { |
| 2015 | err = -ENOENT; |
Thomas Graf | 6b3f867 | 2006-08-07 17:58:53 -0700 | [diff] [blame] | 2016 | goto errout_locked; |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 2017 | } |
| 2018 | |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 2019 | /* |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 2020 | * We acquire tbl->lock to be nice to the periodic timers and |
| 2021 | * make sure they always see a consistent set of values. |
| 2022 | */ |
| 2023 | write_lock_bh(&tbl->lock); |
| 2024 | |
Thomas Graf | 6b3f867 | 2006-08-07 17:58:53 -0700 | [diff] [blame] | 2025 | if (tb[NDTA_PARMS]) { |
| 2026 | struct nlattr *tbp[NDTPA_MAX+1]; |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 2027 | struct neigh_parms *p; |
Thomas Graf | 6b3f867 | 2006-08-07 17:58:53 -0700 | [diff] [blame] | 2028 | int i, ifindex = 0; |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 2029 | |
Thomas Graf | 6b3f867 | 2006-08-07 17:58:53 -0700 | [diff] [blame] | 2030 | err = nla_parse_nested(tbp, NDTPA_MAX, tb[NDTA_PARMS], |
| 2031 | nl_ntbl_parm_policy); |
| 2032 | if (err < 0) |
| 2033 | goto errout_tbl_lock; |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 2034 | |
Thomas Graf | 6b3f867 | 2006-08-07 17:58:53 -0700 | [diff] [blame] | 2035 | if (tbp[NDTPA_IFINDEX]) |
| 2036 | ifindex = nla_get_u32(tbp[NDTPA_IFINDEX]); |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 2037 | |
Tobias Klauser | 97fd5bc | 2009-07-13 11:17:49 -0700 | [diff] [blame] | 2038 | p = lookup_neigh_parms(tbl, net, ifindex); |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 2039 | if (p == NULL) { |
| 2040 | err = -ENOENT; |
Thomas Graf | 6b3f867 | 2006-08-07 17:58:53 -0700 | [diff] [blame] | 2041 | goto errout_tbl_lock; |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 2042 | } |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 2043 | |
Thomas Graf | 6b3f867 | 2006-08-07 17:58:53 -0700 | [diff] [blame] | 2044 | for (i = 1; i <= NDTPA_MAX; i++) { |
| 2045 | if (tbp[i] == NULL) |
| 2046 | continue; |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 2047 | |
Thomas Graf | 6b3f867 | 2006-08-07 17:58:53 -0700 | [diff] [blame] | 2048 | switch (i) { |
| 2049 | case NDTPA_QUEUE_LEN: |
Jiri Pirko | 1f9248e5 | 2013-12-07 19:26:53 +0100 | [diff] [blame] | 2050 | NEIGH_VAR_SET(p, QUEUE_LEN_BYTES, |
| 2051 | nla_get_u32(tbp[i]) * |
| 2052 | SKB_TRUESIZE(ETH_FRAME_LEN)); |
Eric Dumazet | 8b5c171 | 2011-11-09 12:07:14 +0000 | [diff] [blame] | 2053 | break; |
| 2054 | case NDTPA_QUEUE_LENBYTES: |
Jiri Pirko | 1f9248e5 | 2013-12-07 19:26:53 +0100 | [diff] [blame] | 2055 | NEIGH_VAR_SET(p, QUEUE_LEN_BYTES, |
| 2056 | nla_get_u32(tbp[i])); |
Thomas Graf | 6b3f867 | 2006-08-07 17:58:53 -0700 | [diff] [blame] | 2057 | break; |
| 2058 | case NDTPA_PROXY_QLEN: |
Jiri Pirko | 1f9248e5 | 2013-12-07 19:26:53 +0100 | [diff] [blame] | 2059 | NEIGH_VAR_SET(p, PROXY_QLEN, |
| 2060 | nla_get_u32(tbp[i])); |
Thomas Graf | 6b3f867 | 2006-08-07 17:58:53 -0700 | [diff] [blame] | 2061 | break; |
| 2062 | case NDTPA_APP_PROBES: |
Jiri Pirko | 1f9248e5 | 2013-12-07 19:26:53 +0100 | [diff] [blame] | 2063 | NEIGH_VAR_SET(p, APP_PROBES, |
| 2064 | nla_get_u32(tbp[i])); |
Thomas Graf | 6b3f867 | 2006-08-07 17:58:53 -0700 | [diff] [blame] | 2065 | break; |
| 2066 | case NDTPA_UCAST_PROBES: |
Jiri Pirko | 1f9248e5 | 2013-12-07 19:26:53 +0100 | [diff] [blame] | 2067 | NEIGH_VAR_SET(p, UCAST_PROBES, |
| 2068 | nla_get_u32(tbp[i])); |
Thomas Graf | 6b3f867 | 2006-08-07 17:58:53 -0700 | [diff] [blame] | 2069 | break; |
| 2070 | case NDTPA_MCAST_PROBES: |
Jiri Pirko | 1f9248e5 | 2013-12-07 19:26:53 +0100 | [diff] [blame] | 2071 | NEIGH_VAR_SET(p, MCAST_PROBES, |
| 2072 | nla_get_u32(tbp[i])); |
Thomas Graf | 6b3f867 | 2006-08-07 17:58:53 -0700 | [diff] [blame] | 2073 | break; |
| 2074 | case NDTPA_BASE_REACHABLE_TIME: |
Jiri Pirko | 1f9248e5 | 2013-12-07 19:26:53 +0100 | [diff] [blame] | 2075 | NEIGH_VAR_SET(p, BASE_REACHABLE_TIME, |
| 2076 | nla_get_msecs(tbp[i])); |
Thomas Graf | 6b3f867 | 2006-08-07 17:58:53 -0700 | [diff] [blame] | 2077 | break; |
| 2078 | case NDTPA_GC_STALETIME: |
Jiri Pirko | 1f9248e5 | 2013-12-07 19:26:53 +0100 | [diff] [blame] | 2079 | NEIGH_VAR_SET(p, GC_STALETIME, |
| 2080 | nla_get_msecs(tbp[i])); |
Thomas Graf | 6b3f867 | 2006-08-07 17:58:53 -0700 | [diff] [blame] | 2081 | break; |
| 2082 | case NDTPA_DELAY_PROBE_TIME: |
Jiri Pirko | 1f9248e5 | 2013-12-07 19:26:53 +0100 | [diff] [blame] | 2083 | NEIGH_VAR_SET(p, DELAY_PROBE_TIME, |
| 2084 | nla_get_msecs(tbp[i])); |
Thomas Graf | 6b3f867 | 2006-08-07 17:58:53 -0700 | [diff] [blame] | 2085 | break; |
| 2086 | case NDTPA_RETRANS_TIME: |
Jiri Pirko | 1f9248e5 | 2013-12-07 19:26:53 +0100 | [diff] [blame] | 2087 | NEIGH_VAR_SET(p, RETRANS_TIME, |
| 2088 | nla_get_msecs(tbp[i])); |
Thomas Graf | 6b3f867 | 2006-08-07 17:58:53 -0700 | [diff] [blame] | 2089 | break; |
| 2090 | case NDTPA_ANYCAST_DELAY: |
Jiri Pirko | 3977458 | 2014-01-14 15:46:07 +0100 | [diff] [blame] | 2091 | NEIGH_VAR_SET(p, ANYCAST_DELAY, |
| 2092 | nla_get_msecs(tbp[i])); |
Thomas Graf | 6b3f867 | 2006-08-07 17:58:53 -0700 | [diff] [blame] | 2093 | break; |
| 2094 | case NDTPA_PROXY_DELAY: |
Jiri Pirko | 3977458 | 2014-01-14 15:46:07 +0100 | [diff] [blame] | 2095 | NEIGH_VAR_SET(p, PROXY_DELAY, |
| 2096 | nla_get_msecs(tbp[i])); |
Thomas Graf | 6b3f867 | 2006-08-07 17:58:53 -0700 | [diff] [blame] | 2097 | break; |
| 2098 | case NDTPA_LOCKTIME: |
Jiri Pirko | 3977458 | 2014-01-14 15:46:07 +0100 | [diff] [blame] | 2099 | NEIGH_VAR_SET(p, LOCKTIME, |
| 2100 | nla_get_msecs(tbp[i])); |
Thomas Graf | 6b3f867 | 2006-08-07 17:58:53 -0700 | [diff] [blame] | 2101 | break; |
| 2102 | } |
| 2103 | } |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 2104 | } |
| 2105 | |
Gao feng | dc25c67 | 2013-06-20 10:01:34 +0800 | [diff] [blame] | 2106 | err = -ENOENT; |
| 2107 | if ((tb[NDTA_THRESH1] || tb[NDTA_THRESH2] || |
| 2108 | tb[NDTA_THRESH3] || tb[NDTA_GC_INTERVAL]) && |
| 2109 | !net_eq(net, &init_net)) |
| 2110 | goto errout_tbl_lock; |
| 2111 | |
Thomas Graf | 6b3f867 | 2006-08-07 17:58:53 -0700 | [diff] [blame] | 2112 | if (tb[NDTA_THRESH1]) |
| 2113 | tbl->gc_thresh1 = nla_get_u32(tb[NDTA_THRESH1]); |
| 2114 | |
| 2115 | if (tb[NDTA_THRESH2]) |
| 2116 | tbl->gc_thresh2 = nla_get_u32(tb[NDTA_THRESH2]); |
| 2117 | |
| 2118 | if (tb[NDTA_THRESH3]) |
| 2119 | tbl->gc_thresh3 = nla_get_u32(tb[NDTA_THRESH3]); |
| 2120 | |
| 2121 | if (tb[NDTA_GC_INTERVAL]) |
| 2122 | tbl->gc_interval = nla_get_msecs(tb[NDTA_GC_INTERVAL]); |
| 2123 | |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 2124 | err = 0; |
| 2125 | |
Thomas Graf | 6b3f867 | 2006-08-07 17:58:53 -0700 | [diff] [blame] | 2126 | errout_tbl_lock: |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 2127 | write_unlock_bh(&tbl->lock); |
Thomas Graf | 6b3f867 | 2006-08-07 17:58:53 -0700 | [diff] [blame] | 2128 | errout_locked: |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 2129 | read_unlock(&neigh_tbl_lock); |
Thomas Graf | 6b3f867 | 2006-08-07 17:58:53 -0700 | [diff] [blame] | 2130 | errout: |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 2131 | return err; |
| 2132 | } |
| 2133 | |
Thomas Graf | c8822a4 | 2007-03-22 11:50:06 -0700 | [diff] [blame] | 2134 | 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] | 2135 | { |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 2136 | struct net *net = sock_net(skb->sk); |
Thomas Graf | ca860fb | 2006-08-07 18:00:18 -0700 | [diff] [blame] | 2137 | int family, tidx, nidx = 0; |
| 2138 | int tbl_skip = cb->args[0]; |
| 2139 | int neigh_skip = cb->args[1]; |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 2140 | struct neigh_table *tbl; |
| 2141 | |
Thomas Graf | ca860fb | 2006-08-07 18:00:18 -0700 | [diff] [blame] | 2142 | family = ((struct rtgenmsg *) nlmsg_data(cb->nlh))->rtgen_family; |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 2143 | |
| 2144 | read_lock(&neigh_tbl_lock); |
Thomas Graf | ca860fb | 2006-08-07 18:00:18 -0700 | [diff] [blame] | 2145 | for (tbl = neigh_tables, tidx = 0; tbl; tbl = tbl->next, tidx++) { |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 2146 | struct neigh_parms *p; |
| 2147 | |
Thomas Graf | ca860fb | 2006-08-07 18:00:18 -0700 | [diff] [blame] | 2148 | if (tidx < tbl_skip || (family && tbl->family != family)) |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 2149 | continue; |
| 2150 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2151 | if (neightbl_fill_info(skb, tbl, NETLINK_CB(cb->skb).portid, |
Thomas Graf | ca860fb | 2006-08-07 18:00:18 -0700 | [diff] [blame] | 2152 | cb->nlh->nlmsg_seq, RTM_NEWNEIGHTBL, |
| 2153 | NLM_F_MULTI) <= 0) |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 2154 | break; |
| 2155 | |
Eric W. Biederman | 426b530 | 2008-01-24 00:13:18 -0800 | [diff] [blame] | 2156 | for (nidx = 0, p = tbl->parms.next; p; p = p->next) { |
YOSHIFUJI Hideaki | 878628f | 2008-03-26 03:57:35 +0900 | [diff] [blame] | 2157 | if (!net_eq(neigh_parms_net(p), net)) |
Eric W. Biederman | 426b530 | 2008-01-24 00:13:18 -0800 | [diff] [blame] | 2158 | continue; |
| 2159 | |
Gautam Kachroo | efc683f | 2009-02-06 00:52:04 -0800 | [diff] [blame] | 2160 | if (nidx < neigh_skip) |
| 2161 | goto next; |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 2162 | |
Thomas Graf | ca860fb | 2006-08-07 18:00:18 -0700 | [diff] [blame] | 2163 | if (neightbl_fill_param_info(skb, tbl, p, |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2164 | NETLINK_CB(cb->skb).portid, |
Thomas Graf | ca860fb | 2006-08-07 18:00:18 -0700 | [diff] [blame] | 2165 | cb->nlh->nlmsg_seq, |
| 2166 | RTM_NEWNEIGHTBL, |
| 2167 | NLM_F_MULTI) <= 0) |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 2168 | goto out; |
Gautam Kachroo | efc683f | 2009-02-06 00:52:04 -0800 | [diff] [blame] | 2169 | next: |
| 2170 | nidx++; |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 2171 | } |
| 2172 | |
Thomas Graf | ca860fb | 2006-08-07 18:00:18 -0700 | [diff] [blame] | 2173 | neigh_skip = 0; |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 2174 | } |
| 2175 | out: |
| 2176 | read_unlock(&neigh_tbl_lock); |
Thomas Graf | ca860fb | 2006-08-07 18:00:18 -0700 | [diff] [blame] | 2177 | cb->args[0] = tidx; |
| 2178 | cb->args[1] = nidx; |
Thomas Graf | c7fb64d | 2005-06-18 22:50:55 -0700 | [diff] [blame] | 2179 | |
| 2180 | return skb->len; |
| 2181 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2182 | |
Thomas Graf | 8b8aec5 | 2006-08-07 17:56:37 -0700 | [diff] [blame] | 2183 | static int neigh_fill_info(struct sk_buff *skb, struct neighbour *neigh, |
| 2184 | u32 pid, u32 seq, int type, unsigned int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2185 | { |
| 2186 | unsigned long now = jiffies; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2187 | struct nda_cacheinfo ci; |
Thomas Graf | 8b8aec5 | 2006-08-07 17:56:37 -0700 | [diff] [blame] | 2188 | struct nlmsghdr *nlh; |
| 2189 | struct ndmsg *ndm; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2190 | |
Thomas Graf | 8b8aec5 | 2006-08-07 17:56:37 -0700 | [diff] [blame] | 2191 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), flags); |
| 2192 | if (nlh == NULL) |
Patrick McHardy | 2693256 | 2007-01-31 23:16:40 -0800 | [diff] [blame] | 2193 | return -EMSGSIZE; |
Thomas Graf | 8b8aec5 | 2006-08-07 17:56:37 -0700 | [diff] [blame] | 2194 | |
| 2195 | ndm = nlmsg_data(nlh); |
| 2196 | ndm->ndm_family = neigh->ops->family; |
Patrick McHardy | 9ef1d4c | 2005-06-28 12:55:30 -0700 | [diff] [blame] | 2197 | ndm->ndm_pad1 = 0; |
| 2198 | ndm->ndm_pad2 = 0; |
Thomas Graf | 8b8aec5 | 2006-08-07 17:56:37 -0700 | [diff] [blame] | 2199 | ndm->ndm_flags = neigh->flags; |
| 2200 | ndm->ndm_type = neigh->type; |
| 2201 | ndm->ndm_ifindex = neigh->dev->ifindex; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2202 | |
David S. Miller | 9a6308d | 2012-04-01 20:06:28 -0400 | [diff] [blame] | 2203 | if (nla_put(skb, NDA_DST, neigh->tbl->key_len, neigh->primary_key)) |
| 2204 | goto nla_put_failure; |
Thomas Graf | 8b8aec5 | 2006-08-07 17:56:37 -0700 | [diff] [blame] | 2205 | |
| 2206 | read_lock_bh(&neigh->lock); |
| 2207 | ndm->ndm_state = neigh->nud_state; |
Eric Dumazet | 0ed8ddf | 2010-10-07 10:44:07 +0000 | [diff] [blame] | 2208 | if (neigh->nud_state & NUD_VALID) { |
| 2209 | char haddr[MAX_ADDR_LEN]; |
| 2210 | |
| 2211 | neigh_ha_snapshot(haddr, neigh, neigh->dev); |
| 2212 | if (nla_put(skb, NDA_LLADDR, neigh->dev->addr_len, haddr) < 0) { |
| 2213 | read_unlock_bh(&neigh->lock); |
| 2214 | goto nla_put_failure; |
| 2215 | } |
Thomas Graf | 8b8aec5 | 2006-08-07 17:56:37 -0700 | [diff] [blame] | 2216 | } |
| 2217 | |
Stephen Hemminger | b9f5f52 | 2008-06-03 16:03:15 -0700 | [diff] [blame] | 2218 | ci.ndm_used = jiffies_to_clock_t(now - neigh->used); |
| 2219 | ci.ndm_confirmed = jiffies_to_clock_t(now - neigh->confirmed); |
| 2220 | ci.ndm_updated = jiffies_to_clock_t(now - neigh->updated); |
Thomas Graf | 8b8aec5 | 2006-08-07 17:56:37 -0700 | [diff] [blame] | 2221 | ci.ndm_refcnt = atomic_read(&neigh->refcnt) - 1; |
| 2222 | read_unlock_bh(&neigh->lock); |
| 2223 | |
David S. Miller | 9a6308d | 2012-04-01 20:06:28 -0400 | [diff] [blame] | 2224 | if (nla_put_u32(skb, NDA_PROBES, atomic_read(&neigh->probes)) || |
| 2225 | nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci)) |
| 2226 | goto nla_put_failure; |
Thomas Graf | 8b8aec5 | 2006-08-07 17:56:37 -0700 | [diff] [blame] | 2227 | |
| 2228 | return nlmsg_end(skb, nlh); |
| 2229 | |
| 2230 | nla_put_failure: |
Patrick McHardy | 2693256 | 2007-01-31 23:16:40 -0800 | [diff] [blame] | 2231 | nlmsg_cancel(skb, nlh); |
| 2232 | return -EMSGSIZE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2233 | } |
| 2234 | |
Tony Zelenoff | 84920c1 | 2012-01-26 22:28:58 +0000 | [diff] [blame] | 2235 | static int pneigh_fill_info(struct sk_buff *skb, struct pneigh_entry *pn, |
| 2236 | u32 pid, u32 seq, int type, unsigned int flags, |
| 2237 | struct neigh_table *tbl) |
| 2238 | { |
| 2239 | struct nlmsghdr *nlh; |
| 2240 | struct ndmsg *ndm; |
| 2241 | |
| 2242 | nlh = nlmsg_put(skb, pid, seq, type, sizeof(*ndm), flags); |
| 2243 | if (nlh == NULL) |
| 2244 | return -EMSGSIZE; |
| 2245 | |
| 2246 | ndm = nlmsg_data(nlh); |
| 2247 | ndm->ndm_family = tbl->family; |
| 2248 | ndm->ndm_pad1 = 0; |
| 2249 | ndm->ndm_pad2 = 0; |
| 2250 | ndm->ndm_flags = pn->flags | NTF_PROXY; |
| 2251 | ndm->ndm_type = NDA_DST; |
| 2252 | ndm->ndm_ifindex = pn->dev->ifindex; |
| 2253 | ndm->ndm_state = NUD_NONE; |
| 2254 | |
David S. Miller | 9a6308d | 2012-04-01 20:06:28 -0400 | [diff] [blame] | 2255 | if (nla_put(skb, NDA_DST, tbl->key_len, pn->key)) |
| 2256 | goto nla_put_failure; |
Tony Zelenoff | 84920c1 | 2012-01-26 22:28:58 +0000 | [diff] [blame] | 2257 | |
| 2258 | return nlmsg_end(skb, nlh); |
| 2259 | |
| 2260 | nla_put_failure: |
| 2261 | nlmsg_cancel(skb, nlh); |
| 2262 | return -EMSGSIZE; |
| 2263 | } |
| 2264 | |
Thomas Graf | d961db3 | 2007-08-08 23:12:56 -0700 | [diff] [blame] | 2265 | static void neigh_update_notify(struct neighbour *neigh) |
| 2266 | { |
| 2267 | call_netevent_notifiers(NETEVENT_NEIGH_UPDATE, neigh); |
| 2268 | __neigh_notify(neigh, RTM_NEWNEIGH, 0); |
| 2269 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2270 | |
| 2271 | static int neigh_dump_table(struct neigh_table *tbl, struct sk_buff *skb, |
| 2272 | struct netlink_callback *cb) |
| 2273 | { |
Eric Dumazet | 767e97e | 2010-10-06 17:49:21 -0700 | [diff] [blame] | 2274 | struct net *net = sock_net(skb->sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2275 | struct neighbour *n; |
| 2276 | int rc, h, s_h = cb->args[1]; |
| 2277 | int idx, s_idx = idx = cb->args[2]; |
Eric Dumazet | d6bf781 | 2010-10-04 06:15:44 +0000 | [diff] [blame] | 2278 | struct neigh_hash_table *nht; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2279 | |
Eric Dumazet | d6bf781 | 2010-10-04 06:15:44 +0000 | [diff] [blame] | 2280 | rcu_read_lock_bh(); |
| 2281 | nht = rcu_dereference_bh(tbl->nht); |
| 2282 | |
Eric Dumazet | 4bd6683 | 2012-06-07 04:58:35 +0000 | [diff] [blame] | 2283 | for (h = s_h; h < (1 << nht->hash_shift); h++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2284 | if (h > s_h) |
| 2285 | s_idx = 0; |
Eric Dumazet | 767e97e | 2010-10-06 17:49:21 -0700 | [diff] [blame] | 2286 | for (n = rcu_dereference_bh(nht->hash_buckets[h]), idx = 0; |
| 2287 | n != NULL; |
| 2288 | n = rcu_dereference_bh(n->next)) { |
Octavian Purdila | 09ad9bc | 2009-11-25 15:14:13 -0800 | [diff] [blame] | 2289 | if (!net_eq(dev_net(n->dev), net)) |
Eric W. Biederman | 426b530 | 2008-01-24 00:13:18 -0800 | [diff] [blame] | 2290 | continue; |
Gautam Kachroo | efc683f | 2009-02-06 00:52:04 -0800 | [diff] [blame] | 2291 | if (idx < s_idx) |
| 2292 | goto next; |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2293 | if (neigh_fill_info(skb, n, NETLINK_CB(cb->skb).portid, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2294 | cb->nlh->nlmsg_seq, |
Jamal Hadi Salim | b6544c0 | 2005-06-18 22:54:12 -0700 | [diff] [blame] | 2295 | RTM_NEWNEIGH, |
| 2296 | NLM_F_MULTI) <= 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2297 | rc = -1; |
| 2298 | goto out; |
| 2299 | } |
Eric Dumazet | 767e97e | 2010-10-06 17:49:21 -0700 | [diff] [blame] | 2300 | next: |
Gautam Kachroo | efc683f | 2009-02-06 00:52:04 -0800 | [diff] [blame] | 2301 | idx++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2302 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2303 | } |
| 2304 | rc = skb->len; |
| 2305 | out: |
Eric Dumazet | d6bf781 | 2010-10-04 06:15:44 +0000 | [diff] [blame] | 2306 | rcu_read_unlock_bh(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2307 | cb->args[1] = h; |
| 2308 | cb->args[2] = idx; |
| 2309 | return rc; |
| 2310 | } |
| 2311 | |
Tony Zelenoff | 84920c1 | 2012-01-26 22:28:58 +0000 | [diff] [blame] | 2312 | static int pneigh_dump_table(struct neigh_table *tbl, struct sk_buff *skb, |
| 2313 | struct netlink_callback *cb) |
| 2314 | { |
| 2315 | struct pneigh_entry *n; |
| 2316 | struct net *net = sock_net(skb->sk); |
| 2317 | int rc, h, s_h = cb->args[3]; |
| 2318 | int idx, s_idx = idx = cb->args[4]; |
| 2319 | |
| 2320 | read_lock_bh(&tbl->lock); |
| 2321 | |
Eric Dumazet | 4bd6683 | 2012-06-07 04:58:35 +0000 | [diff] [blame] | 2322 | for (h = s_h; h <= PNEIGH_HASHMASK; h++) { |
Tony Zelenoff | 84920c1 | 2012-01-26 22:28:58 +0000 | [diff] [blame] | 2323 | if (h > s_h) |
| 2324 | s_idx = 0; |
| 2325 | for (n = tbl->phash_buckets[h], idx = 0; n; n = n->next) { |
| 2326 | if (dev_net(n->dev) != net) |
| 2327 | continue; |
| 2328 | if (idx < s_idx) |
| 2329 | goto next; |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2330 | if (pneigh_fill_info(skb, n, NETLINK_CB(cb->skb).portid, |
Tony Zelenoff | 84920c1 | 2012-01-26 22:28:58 +0000 | [diff] [blame] | 2331 | cb->nlh->nlmsg_seq, |
| 2332 | RTM_NEWNEIGH, |
| 2333 | NLM_F_MULTI, tbl) <= 0) { |
| 2334 | read_unlock_bh(&tbl->lock); |
| 2335 | rc = -1; |
| 2336 | goto out; |
| 2337 | } |
| 2338 | next: |
| 2339 | idx++; |
| 2340 | } |
| 2341 | } |
| 2342 | |
| 2343 | read_unlock_bh(&tbl->lock); |
| 2344 | rc = skb->len; |
| 2345 | out: |
| 2346 | cb->args[3] = h; |
| 2347 | cb->args[4] = idx; |
| 2348 | return rc; |
| 2349 | |
| 2350 | } |
| 2351 | |
Thomas Graf | c8822a4 | 2007-03-22 11:50:06 -0700 | [diff] [blame] | 2352 | 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] | 2353 | { |
| 2354 | struct neigh_table *tbl; |
| 2355 | int t, family, s_t; |
Tony Zelenoff | 84920c1 | 2012-01-26 22:28:58 +0000 | [diff] [blame] | 2356 | int proxy = 0; |
Eric Dumazet | 4bd6683 | 2012-06-07 04:58:35 +0000 | [diff] [blame] | 2357 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2358 | |
| 2359 | read_lock(&neigh_tbl_lock); |
Thomas Graf | 8b8aec5 | 2006-08-07 17:56:37 -0700 | [diff] [blame] | 2360 | family = ((struct rtgenmsg *) nlmsg_data(cb->nlh))->rtgen_family; |
Tony Zelenoff | 84920c1 | 2012-01-26 22:28:58 +0000 | [diff] [blame] | 2361 | |
| 2362 | /* check for full ndmsg structure presence, family member is |
| 2363 | * the same for both structures |
| 2364 | */ |
| 2365 | if (nlmsg_len(cb->nlh) >= sizeof(struct ndmsg) && |
| 2366 | ((struct ndmsg *) nlmsg_data(cb->nlh))->ndm_flags == NTF_PROXY) |
| 2367 | proxy = 1; |
| 2368 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2369 | s_t = cb->args[0]; |
| 2370 | |
Eric Dumazet | 4bd6683 | 2012-06-07 04:58:35 +0000 | [diff] [blame] | 2371 | for (tbl = neigh_tables, t = 0; tbl; |
Tony Zelenoff | 84920c1 | 2012-01-26 22:28:58 +0000 | [diff] [blame] | 2372 | tbl = tbl->next, t++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2373 | if (t < s_t || (family && tbl->family != family)) |
| 2374 | continue; |
| 2375 | if (t > s_t) |
| 2376 | memset(&cb->args[1], 0, sizeof(cb->args) - |
| 2377 | sizeof(cb->args[0])); |
Tony Zelenoff | 84920c1 | 2012-01-26 22:28:58 +0000 | [diff] [blame] | 2378 | if (proxy) |
| 2379 | err = pneigh_dump_table(tbl, skb, cb); |
| 2380 | else |
| 2381 | err = neigh_dump_table(tbl, skb, cb); |
Eric Dumazet | 4bd6683 | 2012-06-07 04:58:35 +0000 | [diff] [blame] | 2382 | if (err < 0) |
| 2383 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2384 | } |
| 2385 | read_unlock(&neigh_tbl_lock); |
| 2386 | |
| 2387 | cb->args[0] = t; |
| 2388 | return skb->len; |
| 2389 | } |
| 2390 | |
| 2391 | void neigh_for_each(struct neigh_table *tbl, void (*cb)(struct neighbour *, void *), void *cookie) |
| 2392 | { |
| 2393 | int chain; |
Eric Dumazet | d6bf781 | 2010-10-04 06:15:44 +0000 | [diff] [blame] | 2394 | struct neigh_hash_table *nht; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2395 | |
Eric Dumazet | d6bf781 | 2010-10-04 06:15:44 +0000 | [diff] [blame] | 2396 | rcu_read_lock_bh(); |
| 2397 | nht = rcu_dereference_bh(tbl->nht); |
| 2398 | |
Eric Dumazet | 767e97e | 2010-10-06 17:49:21 -0700 | [diff] [blame] | 2399 | read_lock(&tbl->lock); /* avoid resizes */ |
David S. Miller | cd08933 | 2011-07-11 01:28:12 -0700 | [diff] [blame] | 2400 | for (chain = 0; chain < (1 << nht->hash_shift); chain++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2401 | struct neighbour *n; |
| 2402 | |
Eric Dumazet | 767e97e | 2010-10-06 17:49:21 -0700 | [diff] [blame] | 2403 | for (n = rcu_dereference_bh(nht->hash_buckets[chain]); |
| 2404 | n != NULL; |
| 2405 | n = rcu_dereference_bh(n->next)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2406 | cb(n, cookie); |
| 2407 | } |
Eric Dumazet | d6bf781 | 2010-10-04 06:15:44 +0000 | [diff] [blame] | 2408 | read_unlock(&tbl->lock); |
| 2409 | rcu_read_unlock_bh(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2410 | } |
| 2411 | EXPORT_SYMBOL(neigh_for_each); |
| 2412 | |
| 2413 | /* The tbl->lock must be held as a writer and BH disabled. */ |
| 2414 | void __neigh_for_each_release(struct neigh_table *tbl, |
| 2415 | int (*cb)(struct neighbour *)) |
| 2416 | { |
| 2417 | int chain; |
Eric Dumazet | d6bf781 | 2010-10-04 06:15:44 +0000 | [diff] [blame] | 2418 | struct neigh_hash_table *nht; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2419 | |
Eric Dumazet | d6bf781 | 2010-10-04 06:15:44 +0000 | [diff] [blame] | 2420 | nht = rcu_dereference_protected(tbl->nht, |
| 2421 | lockdep_is_held(&tbl->lock)); |
David S. Miller | cd08933 | 2011-07-11 01:28:12 -0700 | [diff] [blame] | 2422 | for (chain = 0; chain < (1 << nht->hash_shift); chain++) { |
Eric Dumazet | 767e97e | 2010-10-06 17:49:21 -0700 | [diff] [blame] | 2423 | struct neighbour *n; |
| 2424 | struct neighbour __rcu **np; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2425 | |
Eric Dumazet | d6bf781 | 2010-10-04 06:15:44 +0000 | [diff] [blame] | 2426 | np = &nht->hash_buckets[chain]; |
Eric Dumazet | 767e97e | 2010-10-06 17:49:21 -0700 | [diff] [blame] | 2427 | while ((n = rcu_dereference_protected(*np, |
| 2428 | lockdep_is_held(&tbl->lock))) != NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2429 | int release; |
| 2430 | |
| 2431 | write_lock(&n->lock); |
| 2432 | release = cb(n); |
| 2433 | if (release) { |
Eric Dumazet | 767e97e | 2010-10-06 17:49:21 -0700 | [diff] [blame] | 2434 | rcu_assign_pointer(*np, |
| 2435 | rcu_dereference_protected(n->next, |
| 2436 | lockdep_is_held(&tbl->lock))); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2437 | n->dead = 1; |
| 2438 | } else |
| 2439 | np = &n->next; |
| 2440 | write_unlock(&n->lock); |
Thomas Graf | 4f49455 | 2007-08-08 23:12:36 -0700 | [diff] [blame] | 2441 | if (release) |
| 2442 | neigh_cleanup_and_release(n); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2443 | } |
| 2444 | } |
| 2445 | } |
| 2446 | EXPORT_SYMBOL(__neigh_for_each_release); |
| 2447 | |
| 2448 | #ifdef CONFIG_PROC_FS |
| 2449 | |
| 2450 | static struct neighbour *neigh_get_first(struct seq_file *seq) |
| 2451 | { |
| 2452 | struct neigh_seq_state *state = seq->private; |
YOSHIFUJI Hideaki | 1218854 | 2008-03-26 02:36:06 +0900 | [diff] [blame] | 2453 | struct net *net = seq_file_net(seq); |
Eric Dumazet | d6bf781 | 2010-10-04 06:15:44 +0000 | [diff] [blame] | 2454 | struct neigh_hash_table *nht = state->nht; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2455 | struct neighbour *n = NULL; |
| 2456 | int bucket = state->bucket; |
| 2457 | |
| 2458 | state->flags &= ~NEIGH_SEQ_IS_PNEIGH; |
David S. Miller | cd08933 | 2011-07-11 01:28:12 -0700 | [diff] [blame] | 2459 | for (bucket = 0; bucket < (1 << nht->hash_shift); bucket++) { |
Eric Dumazet | 767e97e | 2010-10-06 17:49:21 -0700 | [diff] [blame] | 2460 | n = rcu_dereference_bh(nht->hash_buckets[bucket]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2461 | |
| 2462 | while (n) { |
YOSHIFUJI Hideaki | 878628f | 2008-03-26 03:57:35 +0900 | [diff] [blame] | 2463 | if (!net_eq(dev_net(n->dev), net)) |
Eric W. Biederman | 426b530 | 2008-01-24 00:13:18 -0800 | [diff] [blame] | 2464 | goto next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2465 | if (state->neigh_sub_iter) { |
| 2466 | loff_t fakep = 0; |
| 2467 | void *v; |
| 2468 | |
| 2469 | v = state->neigh_sub_iter(state, n, &fakep); |
| 2470 | if (!v) |
| 2471 | goto next; |
| 2472 | } |
| 2473 | if (!(state->flags & NEIGH_SEQ_SKIP_NOARP)) |
| 2474 | break; |
| 2475 | if (n->nud_state & ~NUD_NOARP) |
| 2476 | break; |
Eric Dumazet | 767e97e | 2010-10-06 17:49:21 -0700 | [diff] [blame] | 2477 | next: |
| 2478 | n = rcu_dereference_bh(n->next); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2479 | } |
| 2480 | |
| 2481 | if (n) |
| 2482 | break; |
| 2483 | } |
| 2484 | state->bucket = bucket; |
| 2485 | |
| 2486 | return n; |
| 2487 | } |
| 2488 | |
| 2489 | static struct neighbour *neigh_get_next(struct seq_file *seq, |
| 2490 | struct neighbour *n, |
| 2491 | loff_t *pos) |
| 2492 | { |
| 2493 | struct neigh_seq_state *state = seq->private; |
YOSHIFUJI Hideaki | 1218854 | 2008-03-26 02:36:06 +0900 | [diff] [blame] | 2494 | struct net *net = seq_file_net(seq); |
Eric Dumazet | d6bf781 | 2010-10-04 06:15:44 +0000 | [diff] [blame] | 2495 | struct neigh_hash_table *nht = state->nht; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2496 | |
| 2497 | if (state->neigh_sub_iter) { |
| 2498 | void *v = state->neigh_sub_iter(state, n, pos); |
| 2499 | if (v) |
| 2500 | return n; |
| 2501 | } |
Eric Dumazet | 767e97e | 2010-10-06 17:49:21 -0700 | [diff] [blame] | 2502 | n = rcu_dereference_bh(n->next); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2503 | |
| 2504 | while (1) { |
| 2505 | while (n) { |
YOSHIFUJI Hideaki | 878628f | 2008-03-26 03:57:35 +0900 | [diff] [blame] | 2506 | if (!net_eq(dev_net(n->dev), net)) |
Eric W. Biederman | 426b530 | 2008-01-24 00:13:18 -0800 | [diff] [blame] | 2507 | goto next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2508 | if (state->neigh_sub_iter) { |
| 2509 | void *v = state->neigh_sub_iter(state, n, pos); |
| 2510 | if (v) |
| 2511 | return n; |
| 2512 | goto next; |
| 2513 | } |
| 2514 | if (!(state->flags & NEIGH_SEQ_SKIP_NOARP)) |
| 2515 | break; |
| 2516 | |
| 2517 | if (n->nud_state & ~NUD_NOARP) |
| 2518 | break; |
Eric Dumazet | 767e97e | 2010-10-06 17:49:21 -0700 | [diff] [blame] | 2519 | next: |
| 2520 | n = rcu_dereference_bh(n->next); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2521 | } |
| 2522 | |
| 2523 | if (n) |
| 2524 | break; |
| 2525 | |
David S. Miller | cd08933 | 2011-07-11 01:28:12 -0700 | [diff] [blame] | 2526 | if (++state->bucket >= (1 << nht->hash_shift)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2527 | break; |
| 2528 | |
Eric Dumazet | 767e97e | 2010-10-06 17:49:21 -0700 | [diff] [blame] | 2529 | n = rcu_dereference_bh(nht->hash_buckets[state->bucket]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2530 | } |
| 2531 | |
| 2532 | if (n && pos) |
| 2533 | --(*pos); |
| 2534 | return n; |
| 2535 | } |
| 2536 | |
| 2537 | static struct neighbour *neigh_get_idx(struct seq_file *seq, loff_t *pos) |
| 2538 | { |
| 2539 | struct neighbour *n = neigh_get_first(seq); |
| 2540 | |
| 2541 | if (n) { |
Chris Larson | 745e203 | 2008-08-03 01:10:55 -0700 | [diff] [blame] | 2542 | --(*pos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2543 | while (*pos) { |
| 2544 | n = neigh_get_next(seq, n, pos); |
| 2545 | if (!n) |
| 2546 | break; |
| 2547 | } |
| 2548 | } |
| 2549 | return *pos ? NULL : n; |
| 2550 | } |
| 2551 | |
| 2552 | static struct pneigh_entry *pneigh_get_first(struct seq_file *seq) |
| 2553 | { |
| 2554 | struct neigh_seq_state *state = seq->private; |
YOSHIFUJI Hideaki | 1218854 | 2008-03-26 02:36:06 +0900 | [diff] [blame] | 2555 | struct net *net = seq_file_net(seq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2556 | struct neigh_table *tbl = state->tbl; |
| 2557 | struct pneigh_entry *pn = NULL; |
| 2558 | int bucket = state->bucket; |
| 2559 | |
| 2560 | state->flags |= NEIGH_SEQ_IS_PNEIGH; |
| 2561 | for (bucket = 0; bucket <= PNEIGH_HASHMASK; bucket++) { |
| 2562 | pn = tbl->phash_buckets[bucket]; |
YOSHIFUJI Hideaki | 878628f | 2008-03-26 03:57:35 +0900 | [diff] [blame] | 2563 | while (pn && !net_eq(pneigh_net(pn), net)) |
Eric W. Biederman | 426b530 | 2008-01-24 00:13:18 -0800 | [diff] [blame] | 2564 | pn = pn->next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2565 | if (pn) |
| 2566 | break; |
| 2567 | } |
| 2568 | state->bucket = bucket; |
| 2569 | |
| 2570 | return pn; |
| 2571 | } |
| 2572 | |
| 2573 | static struct pneigh_entry *pneigh_get_next(struct seq_file *seq, |
| 2574 | struct pneigh_entry *pn, |
| 2575 | loff_t *pos) |
| 2576 | { |
| 2577 | struct neigh_seq_state *state = seq->private; |
YOSHIFUJI Hideaki | 1218854 | 2008-03-26 02:36:06 +0900 | [diff] [blame] | 2578 | struct net *net = seq_file_net(seq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2579 | struct neigh_table *tbl = state->tbl; |
| 2580 | |
Jorge Boncompte [DTI2] | df07a94 | 2011-11-25 13:24:49 -0500 | [diff] [blame] | 2581 | do { |
| 2582 | pn = pn->next; |
| 2583 | } while (pn && !net_eq(pneigh_net(pn), net)); |
| 2584 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2585 | while (!pn) { |
| 2586 | if (++state->bucket > PNEIGH_HASHMASK) |
| 2587 | break; |
| 2588 | pn = tbl->phash_buckets[state->bucket]; |
YOSHIFUJI Hideaki | 878628f | 2008-03-26 03:57:35 +0900 | [diff] [blame] | 2589 | while (pn && !net_eq(pneigh_net(pn), net)) |
Eric W. Biederman | 426b530 | 2008-01-24 00:13:18 -0800 | [diff] [blame] | 2590 | pn = pn->next; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2591 | if (pn) |
| 2592 | break; |
| 2593 | } |
| 2594 | |
| 2595 | if (pn && pos) |
| 2596 | --(*pos); |
| 2597 | |
| 2598 | return pn; |
| 2599 | } |
| 2600 | |
| 2601 | static struct pneigh_entry *pneigh_get_idx(struct seq_file *seq, loff_t *pos) |
| 2602 | { |
| 2603 | struct pneigh_entry *pn = pneigh_get_first(seq); |
| 2604 | |
| 2605 | if (pn) { |
Chris Larson | 745e203 | 2008-08-03 01:10:55 -0700 | [diff] [blame] | 2606 | --(*pos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2607 | while (*pos) { |
| 2608 | pn = pneigh_get_next(seq, pn, pos); |
| 2609 | if (!pn) |
| 2610 | break; |
| 2611 | } |
| 2612 | } |
| 2613 | return *pos ? NULL : pn; |
| 2614 | } |
| 2615 | |
| 2616 | static void *neigh_get_idx_any(struct seq_file *seq, loff_t *pos) |
| 2617 | { |
| 2618 | struct neigh_seq_state *state = seq->private; |
| 2619 | void *rc; |
Chris Larson | 745e203 | 2008-08-03 01:10:55 -0700 | [diff] [blame] | 2620 | loff_t idxpos = *pos; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2621 | |
Chris Larson | 745e203 | 2008-08-03 01:10:55 -0700 | [diff] [blame] | 2622 | rc = neigh_get_idx(seq, &idxpos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2623 | if (!rc && !(state->flags & NEIGH_SEQ_NEIGH_ONLY)) |
Chris Larson | 745e203 | 2008-08-03 01:10:55 -0700 | [diff] [blame] | 2624 | rc = pneigh_get_idx(seq, &idxpos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2625 | |
| 2626 | return rc; |
| 2627 | } |
| 2628 | |
| 2629 | 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] | 2630 | __acquires(rcu_bh) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2631 | { |
| 2632 | struct neigh_seq_state *state = seq->private; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2633 | |
| 2634 | state->tbl = tbl; |
| 2635 | state->bucket = 0; |
| 2636 | state->flags = (neigh_seq_flags & ~NEIGH_SEQ_IS_PNEIGH); |
| 2637 | |
Eric Dumazet | d6bf781 | 2010-10-04 06:15:44 +0000 | [diff] [blame] | 2638 | rcu_read_lock_bh(); |
| 2639 | state->nht = rcu_dereference_bh(tbl->nht); |
Eric Dumazet | 767e97e | 2010-10-06 17:49:21 -0700 | [diff] [blame] | 2640 | |
Chris Larson | 745e203 | 2008-08-03 01:10:55 -0700 | [diff] [blame] | 2641 | return *pos ? neigh_get_idx_any(seq, pos) : SEQ_START_TOKEN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2642 | } |
| 2643 | EXPORT_SYMBOL(neigh_seq_start); |
| 2644 | |
| 2645 | void *neigh_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| 2646 | { |
| 2647 | struct neigh_seq_state *state; |
| 2648 | void *rc; |
| 2649 | |
| 2650 | if (v == SEQ_START_TOKEN) { |
Chris Larson | bff6973 | 2008-08-03 01:02:41 -0700 | [diff] [blame] | 2651 | rc = neigh_get_first(seq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2652 | goto out; |
| 2653 | } |
| 2654 | |
| 2655 | state = seq->private; |
| 2656 | if (!(state->flags & NEIGH_SEQ_IS_PNEIGH)) { |
| 2657 | rc = neigh_get_next(seq, v, NULL); |
| 2658 | if (rc) |
| 2659 | goto out; |
| 2660 | if (!(state->flags & NEIGH_SEQ_NEIGH_ONLY)) |
| 2661 | rc = pneigh_get_first(seq); |
| 2662 | } else { |
| 2663 | BUG_ON(state->flags & NEIGH_SEQ_NEIGH_ONLY); |
| 2664 | rc = pneigh_get_next(seq, v, NULL); |
| 2665 | } |
| 2666 | out: |
| 2667 | ++(*pos); |
| 2668 | return rc; |
| 2669 | } |
| 2670 | EXPORT_SYMBOL(neigh_seq_next); |
| 2671 | |
| 2672 | void neigh_seq_stop(struct seq_file *seq, void *v) |
Eric Dumazet | d6bf781 | 2010-10-04 06:15:44 +0000 | [diff] [blame] | 2673 | __releases(rcu_bh) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2674 | { |
Eric Dumazet | d6bf781 | 2010-10-04 06:15:44 +0000 | [diff] [blame] | 2675 | rcu_read_unlock_bh(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2676 | } |
| 2677 | EXPORT_SYMBOL(neigh_seq_stop); |
| 2678 | |
| 2679 | /* statistics via seq_file */ |
| 2680 | |
| 2681 | static void *neigh_stat_seq_start(struct seq_file *seq, loff_t *pos) |
| 2682 | { |
Alexey Dobriyan | 81c1ebf | 2010-01-22 10:16:05 +0000 | [diff] [blame] | 2683 | struct neigh_table *tbl = seq->private; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2684 | int cpu; |
| 2685 | |
| 2686 | if (*pos == 0) |
| 2687 | return SEQ_START_TOKEN; |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 2688 | |
Rusty Russell | 0f23174a | 2008-12-29 12:23:42 +0000 | [diff] [blame] | 2689 | for (cpu = *pos-1; cpu < nr_cpu_ids; ++cpu) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2690 | if (!cpu_possible(cpu)) |
| 2691 | continue; |
| 2692 | *pos = cpu+1; |
| 2693 | return per_cpu_ptr(tbl->stats, cpu); |
| 2694 | } |
| 2695 | return NULL; |
| 2696 | } |
| 2697 | |
| 2698 | static void *neigh_stat_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| 2699 | { |
Alexey Dobriyan | 81c1ebf | 2010-01-22 10:16:05 +0000 | [diff] [blame] | 2700 | struct neigh_table *tbl = seq->private; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2701 | int cpu; |
| 2702 | |
Rusty Russell | 0f23174a | 2008-12-29 12:23:42 +0000 | [diff] [blame] | 2703 | for (cpu = *pos; cpu < nr_cpu_ids; ++cpu) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2704 | if (!cpu_possible(cpu)) |
| 2705 | continue; |
| 2706 | *pos = cpu+1; |
| 2707 | return per_cpu_ptr(tbl->stats, cpu); |
| 2708 | } |
| 2709 | return NULL; |
| 2710 | } |
| 2711 | |
| 2712 | static void neigh_stat_seq_stop(struct seq_file *seq, void *v) |
| 2713 | { |
| 2714 | |
| 2715 | } |
| 2716 | |
| 2717 | static int neigh_stat_seq_show(struct seq_file *seq, void *v) |
| 2718 | { |
Alexey Dobriyan | 81c1ebf | 2010-01-22 10:16:05 +0000 | [diff] [blame] | 2719 | struct neigh_table *tbl = seq->private; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2720 | struct neigh_statistics *st = v; |
| 2721 | |
| 2722 | if (v == SEQ_START_TOKEN) { |
Neil Horman | 9a6d276 | 2008-07-16 20:50:49 -0700 | [diff] [blame] | 2723 | 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] | 2724 | return 0; |
| 2725 | } |
| 2726 | |
| 2727 | seq_printf(seq, "%08x %08lx %08lx %08lx %08lx %08lx %08lx " |
Neil Horman | 9a6d276 | 2008-07-16 20:50:49 -0700 | [diff] [blame] | 2728 | "%08lx %08lx %08lx %08lx %08lx\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2729 | atomic_read(&tbl->entries), |
| 2730 | |
| 2731 | st->allocs, |
| 2732 | st->destroys, |
| 2733 | st->hash_grows, |
| 2734 | |
| 2735 | st->lookups, |
| 2736 | st->hits, |
| 2737 | |
| 2738 | st->res_failed, |
| 2739 | |
| 2740 | st->rcv_probes_mcast, |
| 2741 | st->rcv_probes_ucast, |
| 2742 | |
| 2743 | st->periodic_gc_runs, |
Neil Horman | 9a6d276 | 2008-07-16 20:50:49 -0700 | [diff] [blame] | 2744 | st->forced_gc_runs, |
| 2745 | st->unres_discards |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2746 | ); |
| 2747 | |
| 2748 | return 0; |
| 2749 | } |
| 2750 | |
Stephen Hemminger | f690808 | 2007-03-12 14:34:29 -0700 | [diff] [blame] | 2751 | static const struct seq_operations neigh_stat_seq_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2752 | .start = neigh_stat_seq_start, |
| 2753 | .next = neigh_stat_seq_next, |
| 2754 | .stop = neigh_stat_seq_stop, |
| 2755 | .show = neigh_stat_seq_show, |
| 2756 | }; |
| 2757 | |
| 2758 | static int neigh_stat_seq_open(struct inode *inode, struct file *file) |
| 2759 | { |
| 2760 | int ret = seq_open(file, &neigh_stat_seq_ops); |
| 2761 | |
| 2762 | if (!ret) { |
| 2763 | struct seq_file *sf = file->private_data; |
Al Viro | d9dda78 | 2013-03-31 18:16:14 -0400 | [diff] [blame] | 2764 | sf->private = PDE_DATA(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2765 | } |
| 2766 | return ret; |
| 2767 | }; |
| 2768 | |
Arjan van de Ven | 9a32144 | 2007-02-12 00:55:35 -0800 | [diff] [blame] | 2769 | static const struct file_operations neigh_stat_seq_fops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2770 | .owner = THIS_MODULE, |
| 2771 | .open = neigh_stat_seq_open, |
| 2772 | .read = seq_read, |
| 2773 | .llseek = seq_lseek, |
| 2774 | .release = seq_release, |
| 2775 | }; |
| 2776 | |
| 2777 | #endif /* CONFIG_PROC_FS */ |
| 2778 | |
Thomas Graf | 339bf98 | 2006-11-10 14:10:15 -0800 | [diff] [blame] | 2779 | static inline size_t neigh_nlmsg_size(void) |
| 2780 | { |
| 2781 | return NLMSG_ALIGN(sizeof(struct ndmsg)) |
| 2782 | + nla_total_size(MAX_ADDR_LEN) /* NDA_DST */ |
| 2783 | + nla_total_size(MAX_ADDR_LEN) /* NDA_LLADDR */ |
| 2784 | + nla_total_size(sizeof(struct nda_cacheinfo)) |
| 2785 | + nla_total_size(4); /* NDA_PROBES */ |
| 2786 | } |
| 2787 | |
Thomas Graf | b867331 | 2006-08-15 00:33:14 -0700 | [diff] [blame] | 2788 | static void __neigh_notify(struct neighbour *n, int type, int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2789 | { |
YOSHIFUJI Hideaki | c346dca | 2008-03-25 21:47:49 +0900 | [diff] [blame] | 2790 | struct net *net = dev_net(n->dev); |
Thomas Graf | 8b8aec5 | 2006-08-07 17:56:37 -0700 | [diff] [blame] | 2791 | struct sk_buff *skb; |
Thomas Graf | b867331 | 2006-08-15 00:33:14 -0700 | [diff] [blame] | 2792 | int err = -ENOBUFS; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2793 | |
Thomas Graf | 339bf98 | 2006-11-10 14:10:15 -0800 | [diff] [blame] | 2794 | skb = nlmsg_new(neigh_nlmsg_size(), GFP_ATOMIC); |
Thomas Graf | 8b8aec5 | 2006-08-07 17:56:37 -0700 | [diff] [blame] | 2795 | if (skb == NULL) |
Thomas Graf | b867331 | 2006-08-15 00:33:14 -0700 | [diff] [blame] | 2796 | goto errout; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2797 | |
Thomas Graf | b867331 | 2006-08-15 00:33:14 -0700 | [diff] [blame] | 2798 | err = neigh_fill_info(skb, n, 0, 0, type, flags); |
Patrick McHardy | 2693256 | 2007-01-31 23:16:40 -0800 | [diff] [blame] | 2799 | if (err < 0) { |
| 2800 | /* -EMSGSIZE implies BUG in neigh_nlmsg_size() */ |
| 2801 | WARN_ON(err == -EMSGSIZE); |
| 2802 | kfree_skb(skb); |
| 2803 | goto errout; |
| 2804 | } |
Pablo Neira Ayuso | 1ce85fe | 2009-02-24 23:18:28 -0800 | [diff] [blame] | 2805 | rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC); |
| 2806 | return; |
Thomas Graf | b867331 | 2006-08-15 00:33:14 -0700 | [diff] [blame] | 2807 | errout: |
| 2808 | if (err < 0) |
Eric W. Biederman | 426b530 | 2008-01-24 00:13:18 -0800 | [diff] [blame] | 2809 | rtnl_set_sk_err(net, RTNLGRP_NEIGH, err); |
Thomas Graf | b867331 | 2006-08-15 00:33:14 -0700 | [diff] [blame] | 2810 | } |
| 2811 | |
| 2812 | void neigh_app_ns(struct neighbour *n) |
| 2813 | { |
| 2814 | __neigh_notify(n, RTM_GETNEIGH, NLM_F_REQUEST); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2815 | } |
YOSHIFUJI Hideaki | 0a20450 | 2008-03-24 18:39:10 +0900 | [diff] [blame] | 2816 | EXPORT_SYMBOL(neigh_app_ns); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2817 | |
| 2818 | #ifdef CONFIG_SYSCTL |
Cong Wang | b93196d | 2012-12-06 10:04:04 +0800 | [diff] [blame] | 2819 | static int zero; |
Francesco Fusco | 555445c | 2013-07-24 10:39:06 +0200 | [diff] [blame] | 2820 | static int int_max = INT_MAX; |
Cong Wang | b93196d | 2012-12-06 10:04:04 +0800 | [diff] [blame] | 2821 | static int unres_qlen_max = INT_MAX / SKB_TRUESIZE(ETH_FRAME_LEN); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2822 | |
Joe Perches | fe2c633 | 2013-06-11 23:04:25 -0700 | [diff] [blame] | 2823 | static int proc_unres_qlen(struct ctl_table *ctl, int write, |
| 2824 | void __user *buffer, size_t *lenp, loff_t *ppos) |
Eric Dumazet | 8b5c171 | 2011-11-09 12:07:14 +0000 | [diff] [blame] | 2825 | { |
| 2826 | int size, ret; |
Joe Perches | fe2c633 | 2013-06-11 23:04:25 -0700 | [diff] [blame] | 2827 | struct ctl_table tmp = *ctl; |
Eric Dumazet | 8b5c171 | 2011-11-09 12:07:14 +0000 | [diff] [blame] | 2828 | |
Shan Wei | ce46cc6 | 2012-12-04 18:49:15 +0000 | [diff] [blame] | 2829 | tmp.extra1 = &zero; |
| 2830 | tmp.extra2 = &unres_qlen_max; |
Eric Dumazet | 8b5c171 | 2011-11-09 12:07:14 +0000 | [diff] [blame] | 2831 | tmp.data = &size; |
Shan Wei | ce46cc6 | 2012-12-04 18:49:15 +0000 | [diff] [blame] | 2832 | |
| 2833 | size = *(int *)ctl->data / SKB_TRUESIZE(ETH_FRAME_LEN); |
| 2834 | ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos); |
| 2835 | |
Eric Dumazet | 8b5c171 | 2011-11-09 12:07:14 +0000 | [diff] [blame] | 2836 | if (write && !ret) |
| 2837 | *(int *)ctl->data = size * SKB_TRUESIZE(ETH_FRAME_LEN); |
| 2838 | return ret; |
| 2839 | } |
| 2840 | |
Jiri Pirko | 1d4c8c2 | 2013-12-07 19:26:56 +0100 | [diff] [blame] | 2841 | static struct neigh_parms *neigh_get_dev_parms_rcu(struct net_device *dev, |
| 2842 | int family) |
| 2843 | { |
Jiri Pirko | bba2489 | 2013-12-07 19:26:57 +0100 | [diff] [blame] | 2844 | switch (family) { |
| 2845 | case AF_INET: |
Jiri Pirko | 1d4c8c2 | 2013-12-07 19:26:56 +0100 | [diff] [blame] | 2846 | return __in_dev_arp_parms_get_rcu(dev); |
Jiri Pirko | bba2489 | 2013-12-07 19:26:57 +0100 | [diff] [blame] | 2847 | case AF_INET6: |
| 2848 | return __in6_dev_nd_parms_get_rcu(dev); |
| 2849 | } |
Jiri Pirko | 1d4c8c2 | 2013-12-07 19:26:56 +0100 | [diff] [blame] | 2850 | return NULL; |
| 2851 | } |
| 2852 | |
| 2853 | static void neigh_copy_dflt_parms(struct net *net, struct neigh_parms *p, |
| 2854 | int index) |
| 2855 | { |
| 2856 | struct net_device *dev; |
| 2857 | int family = neigh_parms_family(p); |
| 2858 | |
| 2859 | rcu_read_lock(); |
| 2860 | for_each_netdev_rcu(net, dev) { |
| 2861 | struct neigh_parms *dst_p = |
| 2862 | neigh_get_dev_parms_rcu(dev, family); |
| 2863 | |
| 2864 | if (dst_p && !test_bit(index, dst_p->data_state)) |
| 2865 | dst_p->data[index] = p->data[index]; |
| 2866 | } |
| 2867 | rcu_read_unlock(); |
| 2868 | } |
| 2869 | |
| 2870 | static void neigh_proc_update(struct ctl_table *ctl, int write) |
| 2871 | { |
| 2872 | struct net_device *dev = ctl->extra1; |
| 2873 | struct neigh_parms *p = ctl->extra2; |
Jiri Pirko | 77d47af | 2013-12-10 23:55:07 +0100 | [diff] [blame] | 2874 | struct net *net = neigh_parms_net(p); |
Jiri Pirko | 1d4c8c2 | 2013-12-07 19:26:56 +0100 | [diff] [blame] | 2875 | int index = (int *) ctl->data - p->data; |
| 2876 | |
| 2877 | if (!write) |
| 2878 | return; |
| 2879 | |
| 2880 | set_bit(index, p->data_state); |
| 2881 | if (!dev) /* NULL dev means this is default value */ |
| 2882 | neigh_copy_dflt_parms(net, p, index); |
| 2883 | } |
| 2884 | |
Jiri Pirko | 1f9248e5 | 2013-12-07 19:26:53 +0100 | [diff] [blame] | 2885 | static int neigh_proc_dointvec_zero_intmax(struct ctl_table *ctl, int write, |
| 2886 | void __user *buffer, |
| 2887 | size_t *lenp, loff_t *ppos) |
| 2888 | { |
| 2889 | struct ctl_table tmp = *ctl; |
Jiri Pirko | 1d4c8c2 | 2013-12-07 19:26:56 +0100 | [diff] [blame] | 2890 | int ret; |
Jiri Pirko | 1f9248e5 | 2013-12-07 19:26:53 +0100 | [diff] [blame] | 2891 | |
| 2892 | tmp.extra1 = &zero; |
| 2893 | tmp.extra2 = &int_max; |
| 2894 | |
Jiri Pirko | 1d4c8c2 | 2013-12-07 19:26:56 +0100 | [diff] [blame] | 2895 | ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos); |
| 2896 | neigh_proc_update(ctl, write); |
| 2897 | return ret; |
Jiri Pirko | 1f9248e5 | 2013-12-07 19:26:53 +0100 | [diff] [blame] | 2898 | } |
| 2899 | |
Jiri Pirko | cb5b09c | 2013-12-07 19:26:54 +0100 | [diff] [blame] | 2900 | int neigh_proc_dointvec(struct ctl_table *ctl, int write, |
| 2901 | void __user *buffer, size_t *lenp, loff_t *ppos) |
| 2902 | { |
Jiri Pirko | 1d4c8c2 | 2013-12-07 19:26:56 +0100 | [diff] [blame] | 2903 | int ret = proc_dointvec(ctl, write, buffer, lenp, ppos); |
| 2904 | |
| 2905 | neigh_proc_update(ctl, write); |
| 2906 | return ret; |
Jiri Pirko | cb5b09c | 2013-12-07 19:26:54 +0100 | [diff] [blame] | 2907 | } |
| 2908 | EXPORT_SYMBOL(neigh_proc_dointvec); |
| 2909 | |
| 2910 | int neigh_proc_dointvec_jiffies(struct ctl_table *ctl, int write, |
| 2911 | void __user *buffer, |
| 2912 | size_t *lenp, loff_t *ppos) |
| 2913 | { |
Jiri Pirko | 1d4c8c2 | 2013-12-07 19:26:56 +0100 | [diff] [blame] | 2914 | int ret = proc_dointvec_jiffies(ctl, write, buffer, lenp, ppos); |
| 2915 | |
| 2916 | neigh_proc_update(ctl, write); |
| 2917 | return ret; |
Jiri Pirko | cb5b09c | 2013-12-07 19:26:54 +0100 | [diff] [blame] | 2918 | } |
| 2919 | EXPORT_SYMBOL(neigh_proc_dointvec_jiffies); |
| 2920 | |
| 2921 | static int neigh_proc_dointvec_userhz_jiffies(struct ctl_table *ctl, int write, |
| 2922 | void __user *buffer, |
| 2923 | size_t *lenp, loff_t *ppos) |
| 2924 | { |
Jiri Pirko | 1d4c8c2 | 2013-12-07 19:26:56 +0100 | [diff] [blame] | 2925 | int ret = proc_dointvec_userhz_jiffies(ctl, write, buffer, lenp, ppos); |
| 2926 | |
| 2927 | neigh_proc_update(ctl, write); |
| 2928 | return ret; |
Jiri Pirko | cb5b09c | 2013-12-07 19:26:54 +0100 | [diff] [blame] | 2929 | } |
| 2930 | |
| 2931 | int neigh_proc_dointvec_ms_jiffies(struct ctl_table *ctl, int write, |
| 2932 | void __user *buffer, |
| 2933 | size_t *lenp, loff_t *ppos) |
| 2934 | { |
Jiri Pirko | 1d4c8c2 | 2013-12-07 19:26:56 +0100 | [diff] [blame] | 2935 | int ret = proc_dointvec_ms_jiffies(ctl, write, buffer, lenp, ppos); |
| 2936 | |
| 2937 | neigh_proc_update(ctl, write); |
| 2938 | return ret; |
Jiri Pirko | cb5b09c | 2013-12-07 19:26:54 +0100 | [diff] [blame] | 2939 | } |
| 2940 | EXPORT_SYMBOL(neigh_proc_dointvec_ms_jiffies); |
| 2941 | |
| 2942 | static int neigh_proc_dointvec_unres_qlen(struct ctl_table *ctl, int write, |
| 2943 | void __user *buffer, |
| 2944 | size_t *lenp, loff_t *ppos) |
| 2945 | { |
Jiri Pirko | 1d4c8c2 | 2013-12-07 19:26:56 +0100 | [diff] [blame] | 2946 | int ret = proc_unres_qlen(ctl, write, buffer, lenp, ppos); |
| 2947 | |
| 2948 | neigh_proc_update(ctl, write); |
| 2949 | return ret; |
Jiri Pirko | cb5b09c | 2013-12-07 19:26:54 +0100 | [diff] [blame] | 2950 | } |
| 2951 | |
Jiri Pirko | 1f9248e5 | 2013-12-07 19:26:53 +0100 | [diff] [blame] | 2952 | #define NEIGH_PARMS_DATA_OFFSET(index) \ |
| 2953 | (&((struct neigh_parms *) 0)->data[index]) |
| 2954 | |
| 2955 | #define NEIGH_SYSCTL_ENTRY(attr, data_attr, name, mval, proc) \ |
| 2956 | [NEIGH_VAR_ ## attr] = { \ |
| 2957 | .procname = name, \ |
| 2958 | .data = NEIGH_PARMS_DATA_OFFSET(NEIGH_VAR_ ## data_attr), \ |
| 2959 | .maxlen = sizeof(int), \ |
| 2960 | .mode = mval, \ |
| 2961 | .proc_handler = proc, \ |
| 2962 | } |
| 2963 | |
| 2964 | #define NEIGH_SYSCTL_ZERO_INTMAX_ENTRY(attr, name) \ |
| 2965 | NEIGH_SYSCTL_ENTRY(attr, attr, name, 0644, neigh_proc_dointvec_zero_intmax) |
| 2966 | |
| 2967 | #define NEIGH_SYSCTL_JIFFIES_ENTRY(attr, name) \ |
Jiri Pirko | cb5b09c | 2013-12-07 19:26:54 +0100 | [diff] [blame] | 2968 | NEIGH_SYSCTL_ENTRY(attr, attr, name, 0644, neigh_proc_dointvec_jiffies) |
Jiri Pirko | 1f9248e5 | 2013-12-07 19:26:53 +0100 | [diff] [blame] | 2969 | |
| 2970 | #define NEIGH_SYSCTL_USERHZ_JIFFIES_ENTRY(attr, name) \ |
Jiri Pirko | cb5b09c | 2013-12-07 19:26:54 +0100 | [diff] [blame] | 2971 | NEIGH_SYSCTL_ENTRY(attr, attr, name, 0644, neigh_proc_dointvec_userhz_jiffies) |
Jiri Pirko | 1f9248e5 | 2013-12-07 19:26:53 +0100 | [diff] [blame] | 2972 | |
| 2973 | #define NEIGH_SYSCTL_MS_JIFFIES_ENTRY(attr, name) \ |
Jiri Pirko | cb5b09c | 2013-12-07 19:26:54 +0100 | [diff] [blame] | 2974 | NEIGH_SYSCTL_ENTRY(attr, attr, name, 0644, neigh_proc_dointvec_ms_jiffies) |
Jiri Pirko | 1f9248e5 | 2013-12-07 19:26:53 +0100 | [diff] [blame] | 2975 | |
| 2976 | #define NEIGH_SYSCTL_MS_JIFFIES_REUSED_ENTRY(attr, data_attr, name) \ |
Jiri Pirko | cb5b09c | 2013-12-07 19:26:54 +0100 | [diff] [blame] | 2977 | NEIGH_SYSCTL_ENTRY(attr, data_attr, name, 0644, neigh_proc_dointvec_ms_jiffies) |
Jiri Pirko | 1f9248e5 | 2013-12-07 19:26:53 +0100 | [diff] [blame] | 2978 | |
| 2979 | #define NEIGH_SYSCTL_UNRES_QLEN_REUSED_ENTRY(attr, data_attr, name) \ |
Jiri Pirko | cb5b09c | 2013-12-07 19:26:54 +0100 | [diff] [blame] | 2980 | NEIGH_SYSCTL_ENTRY(attr, data_attr, name, 0644, neigh_proc_dointvec_unres_qlen) |
Eric W. Biederman | 54716e3 | 2010-02-14 03:27:03 +0000 | [diff] [blame] | 2981 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2982 | static struct neigh_sysctl_table { |
| 2983 | struct ctl_table_header *sysctl_header; |
Eric Dumazet | 8b5c171 | 2011-11-09 12:07:14 +0000 | [diff] [blame] | 2984 | struct ctl_table neigh_vars[NEIGH_VAR_MAX + 1]; |
Brian Haley | ab32ea5 | 2006-09-22 14:15:41 -0700 | [diff] [blame] | 2985 | } neigh_sysctl_template __read_mostly = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2986 | .neigh_vars = { |
Jiri Pirko | 1f9248e5 | 2013-12-07 19:26:53 +0100 | [diff] [blame] | 2987 | NEIGH_SYSCTL_ZERO_INTMAX_ENTRY(MCAST_PROBES, "mcast_solicit"), |
| 2988 | NEIGH_SYSCTL_ZERO_INTMAX_ENTRY(UCAST_PROBES, "ucast_solicit"), |
| 2989 | NEIGH_SYSCTL_ZERO_INTMAX_ENTRY(APP_PROBES, "app_solicit"), |
| 2990 | NEIGH_SYSCTL_USERHZ_JIFFIES_ENTRY(RETRANS_TIME, "retrans_time"), |
| 2991 | NEIGH_SYSCTL_JIFFIES_ENTRY(BASE_REACHABLE_TIME, "base_reachable_time"), |
| 2992 | NEIGH_SYSCTL_JIFFIES_ENTRY(DELAY_PROBE_TIME, "delay_first_probe_time"), |
| 2993 | NEIGH_SYSCTL_JIFFIES_ENTRY(GC_STALETIME, "gc_stale_time"), |
| 2994 | NEIGH_SYSCTL_ZERO_INTMAX_ENTRY(QUEUE_LEN_BYTES, "unres_qlen_bytes"), |
| 2995 | NEIGH_SYSCTL_ZERO_INTMAX_ENTRY(PROXY_QLEN, "proxy_qlen"), |
| 2996 | NEIGH_SYSCTL_USERHZ_JIFFIES_ENTRY(ANYCAST_DELAY, "anycast_delay"), |
| 2997 | NEIGH_SYSCTL_USERHZ_JIFFIES_ENTRY(PROXY_DELAY, "proxy_delay"), |
| 2998 | NEIGH_SYSCTL_USERHZ_JIFFIES_ENTRY(LOCKTIME, "locktime"), |
| 2999 | NEIGH_SYSCTL_UNRES_QLEN_REUSED_ENTRY(QUEUE_LEN, QUEUE_LEN_BYTES, "unres_qlen"), |
| 3000 | NEIGH_SYSCTL_MS_JIFFIES_REUSED_ENTRY(RETRANS_TIME_MS, RETRANS_TIME, "retrans_time_ms"), |
| 3001 | NEIGH_SYSCTL_MS_JIFFIES_REUSED_ENTRY(BASE_REACHABLE_TIME_MS, BASE_REACHABLE_TIME, "base_reachable_time_ms"), |
Eric Dumazet | 8b5c171 | 2011-11-09 12:07:14 +0000 | [diff] [blame] | 3002 | [NEIGH_VAR_GC_INTERVAL] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3003 | .procname = "gc_interval", |
| 3004 | .maxlen = sizeof(int), |
| 3005 | .mode = 0644, |
Alexey Dobriyan | 6d9f239 | 2008-11-03 18:21:05 -0800 | [diff] [blame] | 3006 | .proc_handler = proc_dointvec_jiffies, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3007 | }, |
Eric Dumazet | 8b5c171 | 2011-11-09 12:07:14 +0000 | [diff] [blame] | 3008 | [NEIGH_VAR_GC_THRESH1] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3009 | .procname = "gc_thresh1", |
| 3010 | .maxlen = sizeof(int), |
| 3011 | .mode = 0644, |
Francesco Fusco | 555445c | 2013-07-24 10:39:06 +0200 | [diff] [blame] | 3012 | .extra1 = &zero, |
| 3013 | .extra2 = &int_max, |
| 3014 | .proc_handler = proc_dointvec_minmax, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3015 | }, |
Eric Dumazet | 8b5c171 | 2011-11-09 12:07:14 +0000 | [diff] [blame] | 3016 | [NEIGH_VAR_GC_THRESH2] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3017 | .procname = "gc_thresh2", |
| 3018 | .maxlen = sizeof(int), |
| 3019 | .mode = 0644, |
Francesco Fusco | 555445c | 2013-07-24 10:39:06 +0200 | [diff] [blame] | 3020 | .extra1 = &zero, |
| 3021 | .extra2 = &int_max, |
| 3022 | .proc_handler = proc_dointvec_minmax, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3023 | }, |
Eric Dumazet | 8b5c171 | 2011-11-09 12:07:14 +0000 | [diff] [blame] | 3024 | [NEIGH_VAR_GC_THRESH3] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3025 | .procname = "gc_thresh3", |
| 3026 | .maxlen = sizeof(int), |
| 3027 | .mode = 0644, |
Francesco Fusco | 555445c | 2013-07-24 10:39:06 +0200 | [diff] [blame] | 3028 | .extra1 = &zero, |
| 3029 | .extra2 = &int_max, |
| 3030 | .proc_handler = proc_dointvec_minmax, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3031 | }, |
Pavel Emelyanov | c3bac5a | 2007-12-02 00:08:16 +1100 | [diff] [blame] | 3032 | {}, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3033 | }, |
| 3034 | }; |
| 3035 | |
| 3036 | int neigh_sysctl_register(struct net_device *dev, struct neigh_parms *p, |
Jiri Pirko | 73af614 | 2013-12-07 19:26:55 +0100 | [diff] [blame] | 3037 | proc_handler *handler) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3038 | { |
Jiri Pirko | 1f9248e5 | 2013-12-07 19:26:53 +0100 | [diff] [blame] | 3039 | int i; |
Pavel Emelyanov | 3c607bb | 2007-12-02 00:06:34 +1100 | [diff] [blame] | 3040 | struct neigh_sysctl_table *t; |
Jiri Pirko | 1f9248e5 | 2013-12-07 19:26:53 +0100 | [diff] [blame] | 3041 | const char *dev_name_source; |
Eric W. Biederman | 8f40a1f | 2012-04-19 13:38:03 +0000 | [diff] [blame] | 3042 | char neigh_path[ sizeof("net//neigh/") + IFNAMSIZ + IFNAMSIZ ]; |
Jiri Pirko | 73af614 | 2013-12-07 19:26:55 +0100 | [diff] [blame] | 3043 | char *p_name; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3044 | |
Pavel Emelyanov | 3c607bb | 2007-12-02 00:06:34 +1100 | [diff] [blame] | 3045 | t = kmemdup(&neigh_sysctl_template, sizeof(*t), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3046 | if (!t) |
Pavel Emelyanov | 3c607bb | 2007-12-02 00:06:34 +1100 | [diff] [blame] | 3047 | goto err; |
| 3048 | |
Jiri Pirko | cb5b09c | 2013-12-07 19:26:54 +0100 | [diff] [blame] | 3049 | for (i = 0; i < ARRAY_SIZE(t->neigh_vars); i++) { |
Jiri Pirko | 1f9248e5 | 2013-12-07 19:26:53 +0100 | [diff] [blame] | 3050 | t->neigh_vars[i].data += (long) p; |
Jiri Pirko | cb5b09c | 2013-12-07 19:26:54 +0100 | [diff] [blame] | 3051 | t->neigh_vars[i].extra1 = dev; |
Jiri Pirko | 1d4c8c2 | 2013-12-07 19:26:56 +0100 | [diff] [blame] | 3052 | t->neigh_vars[i].extra2 = p; |
Jiri Pirko | cb5b09c | 2013-12-07 19:26:54 +0100 | [diff] [blame] | 3053 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3054 | |
| 3055 | if (dev) { |
| 3056 | dev_name_source = dev->name; |
Eric W. Biederman | d12af67 | 2007-10-18 03:05:25 -0700 | [diff] [blame] | 3057 | /* Terminate the table early */ |
Eric Dumazet | 8b5c171 | 2011-11-09 12:07:14 +0000 | [diff] [blame] | 3058 | memset(&t->neigh_vars[NEIGH_VAR_GC_INTERVAL], 0, |
| 3059 | sizeof(t->neigh_vars[NEIGH_VAR_GC_INTERVAL])); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3060 | } else { |
Eric W. Biederman | 8f40a1f | 2012-04-19 13:38:03 +0000 | [diff] [blame] | 3061 | dev_name_source = "default"; |
Eric Dumazet | 8b5c171 | 2011-11-09 12:07:14 +0000 | [diff] [blame] | 3062 | t->neigh_vars[NEIGH_VAR_GC_INTERVAL].data = (int *)(p + 1); |
| 3063 | t->neigh_vars[NEIGH_VAR_GC_THRESH1].data = (int *)(p + 1) + 1; |
| 3064 | t->neigh_vars[NEIGH_VAR_GC_THRESH2].data = (int *)(p + 1) + 2; |
| 3065 | t->neigh_vars[NEIGH_VAR_GC_THRESH3].data = (int *)(p + 1) + 3; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3066 | } |
| 3067 | |
Eric W. Biederman | f8572d8 | 2009-11-05 13:32:03 -0800 | [diff] [blame] | 3068 | if (handler) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3069 | /* RetransTime */ |
Eric Dumazet | 8b5c171 | 2011-11-09 12:07:14 +0000 | [diff] [blame] | 3070 | t->neigh_vars[NEIGH_VAR_RETRANS_TIME].proc_handler = handler; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3071 | /* ReachableTime */ |
Eric Dumazet | 8b5c171 | 2011-11-09 12:07:14 +0000 | [diff] [blame] | 3072 | t->neigh_vars[NEIGH_VAR_BASE_REACHABLE_TIME].proc_handler = handler; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3073 | /* RetransTime (in milliseconds)*/ |
Eric Dumazet | 8b5c171 | 2011-11-09 12:07:14 +0000 | [diff] [blame] | 3074 | t->neigh_vars[NEIGH_VAR_RETRANS_TIME_MS].proc_handler = handler; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3075 | /* ReachableTime (in milliseconds) */ |
Eric Dumazet | 8b5c171 | 2011-11-09 12:07:14 +0000 | [diff] [blame] | 3076 | t->neigh_vars[NEIGH_VAR_BASE_REACHABLE_TIME_MS].proc_handler = handler; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3077 | } |
| 3078 | |
Eric W. Biederman | 464dc80 | 2012-11-16 03:02:59 +0000 | [diff] [blame] | 3079 | /* Don't export sysctls to unprivileged users */ |
| 3080 | if (neigh_parms_net(p)->user_ns != &init_user_ns) |
| 3081 | t->neigh_vars[0].procname = NULL; |
| 3082 | |
Jiri Pirko | 73af614 | 2013-12-07 19:26:55 +0100 | [diff] [blame] | 3083 | switch (neigh_parms_family(p)) { |
| 3084 | case AF_INET: |
| 3085 | p_name = "ipv4"; |
| 3086 | break; |
| 3087 | case AF_INET6: |
| 3088 | p_name = "ipv6"; |
| 3089 | break; |
| 3090 | default: |
| 3091 | BUG(); |
| 3092 | } |
| 3093 | |
Eric W. Biederman | 8f40a1f | 2012-04-19 13:38:03 +0000 | [diff] [blame] | 3094 | snprintf(neigh_path, sizeof(neigh_path), "net/%s/neigh/%s", |
| 3095 | p_name, dev_name_source); |
Denis V. Lunev | 4ab438f | 2008-02-28 20:48:01 -0800 | [diff] [blame] | 3096 | t->sysctl_header = |
Eric W. Biederman | 8f40a1f | 2012-04-19 13:38:03 +0000 | [diff] [blame] | 3097 | register_net_sysctl(neigh_parms_net(p), neigh_path, t->neigh_vars); |
Pavel Emelyanov | 3c607bb | 2007-12-02 00:06:34 +1100 | [diff] [blame] | 3098 | if (!t->sysctl_header) |
Eric W. Biederman | 8f40a1f | 2012-04-19 13:38:03 +0000 | [diff] [blame] | 3099 | goto free; |
Pavel Emelyanov | 3c607bb | 2007-12-02 00:06:34 +1100 | [diff] [blame] | 3100 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3101 | p->sysctl_table = t; |
| 3102 | return 0; |
| 3103 | |
Pavel Emelyanov | 3c607bb | 2007-12-02 00:06:34 +1100 | [diff] [blame] | 3104 | free: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3105 | kfree(t); |
Pavel Emelyanov | 3c607bb | 2007-12-02 00:06:34 +1100 | [diff] [blame] | 3106 | err: |
| 3107 | return -ENOBUFS; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3108 | } |
YOSHIFUJI Hideaki | 0a20450 | 2008-03-24 18:39:10 +0900 | [diff] [blame] | 3109 | EXPORT_SYMBOL(neigh_sysctl_register); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3110 | |
| 3111 | void neigh_sysctl_unregister(struct neigh_parms *p) |
| 3112 | { |
| 3113 | if (p->sysctl_table) { |
| 3114 | struct neigh_sysctl_table *t = p->sysctl_table; |
| 3115 | p->sysctl_table = NULL; |
Eric W. Biederman | 5dd3df1 | 2012-04-19 13:24:33 +0000 | [diff] [blame] | 3116 | unregister_net_sysctl_table(t->sysctl_header); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3117 | kfree(t); |
| 3118 | } |
| 3119 | } |
YOSHIFUJI Hideaki | 0a20450 | 2008-03-24 18:39:10 +0900 | [diff] [blame] | 3120 | EXPORT_SYMBOL(neigh_sysctl_unregister); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3121 | |
| 3122 | #endif /* CONFIG_SYSCTL */ |
| 3123 | |
Thomas Graf | c8822a4 | 2007-03-22 11:50:06 -0700 | [diff] [blame] | 3124 | static int __init neigh_init(void) |
| 3125 | { |
Greg Rose | c7ac867 | 2011-06-10 01:27:09 +0000 | [diff] [blame] | 3126 | rtnl_register(PF_UNSPEC, RTM_NEWNEIGH, neigh_add, NULL, NULL); |
| 3127 | rtnl_register(PF_UNSPEC, RTM_DELNEIGH, neigh_delete, NULL, NULL); |
| 3128 | rtnl_register(PF_UNSPEC, RTM_GETNEIGH, NULL, neigh_dump_info, NULL); |
Thomas Graf | c8822a4 | 2007-03-22 11:50:06 -0700 | [diff] [blame] | 3129 | |
Greg Rose | c7ac867 | 2011-06-10 01:27:09 +0000 | [diff] [blame] | 3130 | rtnl_register(PF_UNSPEC, RTM_GETNEIGHTBL, NULL, neightbl_dump_info, |
| 3131 | NULL); |
| 3132 | rtnl_register(PF_UNSPEC, RTM_SETNEIGHTBL, neightbl_set, NULL, NULL); |
Thomas Graf | c8822a4 | 2007-03-22 11:50:06 -0700 | [diff] [blame] | 3133 | |
| 3134 | return 0; |
| 3135 | } |
| 3136 | |
| 3137 | subsys_initcall(neigh_init); |
| 3138 | |