aboutsummaryrefslogtreecommitdiff
path: root/net/core/neighbour.c
diff options
context:
space:
mode:
Diffstat (limited to 'net/core/neighbour.c')
-rw-r--r--net/core/neighbour.c2362
1 files changed, 2362 insertions, 0 deletions
diff --git a/net/core/neighbour.c b/net/core/neighbour.c
new file mode 100644
index 00000000000..0a2f67bbef2
--- /dev/null
+++ b/net/core/neighbour.c
@@ -0,0 +1,2362 @@
+/*
+ * Generic address resolution entity
+ *
+ * Authors:
+ * Pedro Roque <roque@di.fc.ul.pt>
+ * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ *
+ * Fixes:
+ * Vitaly E. Lavrov releasing NULL neighbor in neigh_add.
+ * Harald Welte Add neighbour cache statistics like rtstat
+ */
+
+#include <linux/config.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/socket.h>
+#include <linux/sched.h>
+#include <linux/netdevice.h>
+#include <linux/proc_fs.h>
+#ifdef CONFIG_SYSCTL
+#include <linux/sysctl.h>
+#endif
+#include <linux/times.h>
+#include <net/neighbour.h>
+#include <net/dst.h>
+#include <net/sock.h>
+#include <linux/rtnetlink.h>
+#include <linux/random.h>
+
+#define NEIGH_DEBUG 1
+
+#define NEIGH_PRINTK(x...) printk(x)
+#define NEIGH_NOPRINTK(x...) do { ; } while(0)
+#define NEIGH_PRINTK0 NEIGH_PRINTK
+#define NEIGH_PRINTK1 NEIGH_NOPRINTK
+#define NEIGH_PRINTK2 NEIGH_NOPRINTK
+
+#if NEIGH_DEBUG >= 1
+#undef NEIGH_PRINTK1
+#define NEIGH_PRINTK1 NEIGH_PRINTK
+#endif
+#if NEIGH_DEBUG >= 2
+#undef NEIGH_PRINTK2
+#define NEIGH_PRINTK2 NEIGH_PRINTK
+#endif
+
+#define PNEIGH_HASHMASK 0xF
+
+static void neigh_timer_handler(unsigned long arg);
+#ifdef CONFIG_ARPD
+static void neigh_app_notify(struct neighbour *n);
+#endif
+static int pneigh_ifdown(struct neigh_table *tbl, struct net_device *dev);
+void neigh_changeaddr(struct neigh_table *tbl, struct net_device *dev);
+
+static struct neigh_table *neigh_tables;
+static struct file_operations neigh_stat_seq_fops;
+
+/*
+ Neighbour hash table buckets are protected with rwlock tbl->lock.
+
+ - All the scans/updates to hash buckets MUST be made under this lock.
+ - NOTHING clever should be made under this lock: no callbacks
+ to protocol backends, no attempts to send something to network.
+ It will result in deadlocks, if backend/driver wants to use neighbour
+ cache.
+ - If the entry requires some non-trivial actions, increase
+ its reference count and release table lock.
+
+ Neighbour entries are protected:
+ - with reference count.
+ - with rwlock neigh->lock
+
+ Reference count prevents destruction.
+
+ neigh->lock mainly serializes ll address data and its validity state.
+ However, the same lock is used to protect another entry fields:
+ - timer
+ - resolution queue
+
+ Again, nothing clever shall be made under neigh->lock,
+ the most complicated procedure, which we allow is dev->hard_header.
+ It is supposed, that dev->hard_header is simplistic and does
+ not make callbacks to neighbour tables.
+
+ The last lock is neigh_tbl_lock. It is pure SMP lock, protecting
+ list of neighbour tables. This list is used only in process context,
+ */
+
+static DEFINE_RWLOCK(neigh_tbl_lock);
+
+static int neigh_blackhole(struct sk_buff *skb)
+{
+ kfree_skb(skb);
+ return -ENETDOWN;
+}
+
+/*
+ * It is random distribution in the interval (1/2)*base...(3/2)*base.
+ * It corresponds to default IPv6 settings and is not overridable,
+ * because it is really reasonable choice.
+ */
+
+unsigned long neigh_rand_reach_time(unsigned long base)
+{
+ return (base ? (net_random() % base) + (base >> 1) : 0);
+}
+
+
+static int neigh_forced_gc(struct neigh_table *tbl)
+{
+ int shrunk = 0;
+ int i;
+
+ NEIGH_CACHE_STAT_INC(tbl, forced_gc_runs);
+
+ write_lock_bh(&tbl->lock);
+ for (i = 0; i <= tbl->hash_mask; i++) {
+ struct neighbour *n, **np;
+
+ np = &tbl->hash_buckets[i];
+ while ((n = *np) != NULL) {
+ /* Neighbour record may be discarded if:
+ * - nobody refers to it.
+ * - it is not permanent
+ */
+ write_lock(&n->lock);
+ if (atomic_read(&n->refcnt) == 1 &&
+ !(n->nud_state & NUD_PERMANENT)) {
+ *np = n->next;
+ n->dead = 1;
+ shrunk = 1;
+ write_unlock(&n->lock);
+ neigh_release(n);
+ continue;
+ }
+ write_unlock(&n->lock);
+ np = &n->next;
+ }
+ }
+
+ tbl->last_flush = jiffies;
+
+ write_unlock_bh(&tbl->lock);
+
+ return shrunk;
+}
+
+static int neigh_del_timer(struct neighbour *n)
+{
+ if ((n->nud_state & NUD_IN_TIMER) &&
+ del_timer(&n->timer)) {
+ neigh_release(n);
+ return 1;
+ }
+ return 0;
+}
+
+static void pneigh_queue_purge(struct sk_buff_head *list)
+{
+ struct sk_buff *skb;
+
+ while ((skb = skb_dequeue(list)) != NULL) {
+ dev_put(skb->dev);
+ kfree_skb(skb);
+ }
+}
+
+void neigh_changeaddr(struct neigh_table *tbl, struct net_device *dev)
+{
+ int i;
+
+ write_lock_bh(&tbl->lock);
+
+ for (i=0; i <= tbl->hash_mask; i++) {
+ struct neighbour *n, **np;
+
+ np = &tbl->hash_buckets[i];
+ while ((n = *np) != NULL) {
+ if (dev && n->dev != dev) {
+ np = &n->next;
+ continue;
+ }
+ *np = n->next;
+ write_lock_bh(&n->lock);
+ n->dead = 1;
+ neigh_del_timer(n);
+ write_unlock_bh(&n->lock);
+ neigh_release(n);
+ }
+ }
+
+ write_unlock_bh(&tbl->lock);
+}
+
+int neigh_ifdown(struct neigh_table *tbl, struct net_device *dev)
+{
+ int i;
+
+ write_lock_bh(&tbl->lock);
+
+ for (i = 0; i <= tbl->hash_mask; i++) {
+ struct neighbour *n, **np = &tbl->hash_buckets[i];
+
+ while ((n = *np) != NULL) {
+ if (dev && n->dev != dev) {
+ np = &n->next;
+ continue;
+ }
+ *np = n->next;
+ write_lock(&n->lock);
+ neigh_del_timer(n);
+ n->dead = 1;
+
+ if (atomic_read(&n->refcnt) != 1) {
+ /* The most unpleasant situation.
+ We must destroy neighbour entry,
+ but someone still uses it.
+
+ The destroy will be delayed until
+ the last user releases us, but
+ we must kill timers etc. and move
+ it to safe state.
+ */
+ skb_queue_purge(&n->arp_queue);
+ n->output = neigh_blackhole;
+ if (n->nud_state & NUD_VALID)
+ n->nud_state = NUD_NOARP;
+ else
+ n->nud_state = NUD_NONE;
+ NEIGH_PRINTK2("neigh %p is stray.\n", n);
+ }
+ write_unlock(&n->lock);
+ neigh_release(n);
+ }
+ }
+
+ pneigh_ifdown(tbl, dev);
+ write_unlock_bh(&tbl->lock);
+
+ del_timer_sync(&tbl->proxy_timer);
+ pneigh_queue_purge(&tbl->proxy_queue);
+ return 0;
+}
+
+static struct neighbour *neigh_alloc(struct neigh_table *tbl)
+{
+ struct neighbour *n = NULL;
+ unsigned long now = jiffies;
+ int entries;
+
+ entries = atomic_inc_return(&tbl->entries) - 1;
+ if (entries >= tbl->gc_thresh3 ||
+ (entries >= tbl->gc_thresh2 &&
+ time_after(now, tbl->last_flush + 5 * HZ))) {
+ if (!neigh_forced_gc(tbl) &&
+ entries >= tbl->gc_thresh3)
+ goto out_entries;
+ }
+
+ n = kmem_cache_alloc(tbl->kmem_cachep, SLAB_ATOMIC);
+ if (!n)
+ goto out_entries;
+
+ memset(n, 0, tbl->entry_size);
+
+ skb_queue_head_init(&n->arp_queue);
+ rwlock_init(&n->lock);
+ n->updated = n->used = now;
+ n->nud_state = NUD_NONE;
+ n->output = neigh_blackhole;
+ n->parms = neigh_parms_clone(&tbl->parms);
+ init_timer(&n->timer);
+ n->timer.function = neigh_timer_handler;
+ n->timer.data = (unsigned long)n;
+
+ NEIGH_CACHE_STAT_INC(tbl, allocs);
+ n->tbl = tbl;
+ atomic_set(&n->refcnt, 1);
+ n->dead = 1;
+out:
+ return n;
+
+out_entries:
+ atomic_dec(&tbl->entries);
+ goto out;
+}
+
+static struct neighbour **neigh_hash_alloc(unsigned int entries)
+{
+ unsigned long size = entries * sizeof(struct neighbour *);
+ struct neighbour **ret;
+
+ if (size <= PAGE_SIZE) {
+ ret = kmalloc(size, GFP_ATOMIC);
+ } else {
+ ret = (struct neighbour **)
+ __get_free_pages(GFP_ATOMIC, get_order(size));
+ }
+ if (ret)
+ memset(ret, 0, size);
+
+ return ret;
+}
+
+static void neigh_hash_free(struct neighbour **hash, unsigned int entries)
+{
+ unsigned long size = entries * sizeof(struct neighbour *);
+
+ if (size <= PAGE_SIZE)
+ kfree(hash);
+ else
+ free_pages((unsigned long)hash, get_order(size));
+}
+
+static void neigh_hash_grow(struct neigh_table *tbl, unsigned long new_entries)
+{
+ struct neighbour **new_hash, **old_hash;
+ unsigned int i, new_hash_mask, old_entries;
+
+ NEIGH_CACHE_STAT_INC(tbl, hash_grows);
+
+ BUG_ON(new_entries & (new_entries - 1));
+ new_hash = neigh_hash_alloc(new_entries);
+ if (!new_hash)
+ return;
+
+ old_entries = tbl->hash_mask + 1;
+ new_hash_mask = new_entries - 1;
+ old_hash = tbl->hash_buckets;
+
+ get_random_bytes(&tbl->hash_rnd, sizeof(tbl->hash_rnd));
+ for (i = 0; i < old_entries; i++) {
+ struct neighbour *n, *next;
+
+ for (n = old_hash[i]; n; n = next) {
+ unsigned int hash_val = tbl->hash(n->primary_key, n->dev);
+
+ hash_val &= new_hash_mask;
+ next = n->next;
+
+ n->next = new_hash[hash_val];
+ new_hash[hash_val] = n;
+ }
+ }
+ tbl->hash_buckets = new_hash;
+ tbl->hash_mask = new_hash_mask;
+
+ neigh_hash_free(old_hash, old_entries);
+}
+
+struct neighbour *neigh_lookup(struct neigh_table *tbl, const void *pkey,
+ struct net_device *dev)
+{
+ struct neighbour *n;
+ int key_len = tbl->key_len;
+ u32 hash_val = tbl->hash(pkey, dev) & tbl->hash_mask;
+
+ NEIGH_CACHE_STAT_INC(tbl, lookups);
+
+ read_lock_bh(&tbl->lock);
+ for (n = tbl->hash_buckets[hash_val]; n; n = n->next) {
+ if (dev == n->dev && !memcmp(n->primary_key, pkey, key_len)) {
+ neigh_hold(n);
+ NEIGH_CACHE_STAT_INC(tbl, hits);
+ break;
+ }
+ }
+ read_unlock_bh(&tbl->lock);
+ return n;
+}
+
+struct neighbour *neigh_lookup_nodev(struct neigh_table *tbl, const void *pkey)
+{
+ struct neighbour *n;
+ int key_len = tbl->key_len;
+ u32 hash_val = tbl->hash(pkey, NULL) & tbl->hash_mask;
+
+ NEIGH_CACHE_STAT_INC(tbl, lookups);
+
+ read_lock_bh(&tbl->lock);
+ for (n = tbl->hash_buckets[hash_val]; n; n = n->next) {
+ if (!memcmp(n->primary_key, pkey, key_len)) {
+ neigh_hold(n);
+ NEIGH_CACHE_STAT_INC(tbl, hits);
+ break;
+ }
+ }
+ read_unlock_bh(&tbl->lock);
+ return n;
+}
+
+struct neighbour *neigh_create(struct neigh_table *tbl, const void *pkey,
+ struct net_device *dev)
+{
+ u32 hash_val;
+ int key_len = tbl->key_len;
+ int error;
+ struct neighbour *n1, *rc, *n = neigh_alloc(tbl);
+
+ if (!n) {
+ rc = ERR_PTR(-ENOBUFS);
+ goto out;
+ }
+
+ memcpy(n->primary_key, pkey, key_len);
+ n->dev = dev;
+ dev_hold(dev);
+
+ /* Protocol specific setup. */
+ if (tbl->constructor && (error = tbl->constructor(n)) < 0) {
+ rc = ERR_PTR(error);
+ goto out_neigh_release;
+ }
+
+ /* Device specific setup. */
+ if (n->parms->neigh_setup &&
+ (error = n->parms->neigh_setup(n)) < 0) {
+ rc = ERR_PTR(error);
+ goto out_neigh_release;
+ }
+
+ n->confirmed = jiffies - (n->parms->base_reachable_time << 1);
+
+ write_lock_bh(&tbl->lock);
+
+ if (atomic_read(&tbl->entries) > (tbl->hash_mask + 1))
+ neigh_hash_grow(tbl, (tbl->hash_mask + 1) << 1);
+
+ hash_val = tbl->hash(pkey, dev) & tbl->hash_mask;
+
+ if (n->parms->dead) {
+ rc = ERR_PTR(-EINVAL);
+ goto out_tbl_unlock;
+ }
+
+ for (n1 = tbl->hash_buckets[hash_val]; n1; n1 = n1->next) {
+ if (dev == n1->dev && !memcmp(n1->primary_key, pkey, key_len)) {
+ neigh_hold(n1);
+ rc = n1;
+ goto out_tbl_unlock;
+ }
+ }
+
+ n->next = tbl->hash_buckets[hash_val];
+ tbl->hash_buckets[hash_val] = n;
+ n->dead = 0;
+ neigh_hold(n);
+ write_unlock_bh(&tbl->lock);
+ NEIGH_PRINTK2("neigh %p is created.\n", n);
+ rc = n;
+out:
+ return rc;
+out_tbl_unlock:
+ write_unlock_bh(&tbl->lock);
+out_neigh_release:
+ neigh_release(n);
+ goto out;
+}
+
+struct pneigh_entry * pneigh_lookup(struct neigh_table *tbl, const void *pkey,
+ struct net_device *dev, int creat)
+{
+ struct pneigh_entry *n;
+ int key_len = tbl->key_len;
+ u32 hash_val = *(u32 *)(pkey + key_len - 4);
+
+ hash_val ^= (hash_val >> 16);
+ hash_val ^= hash_val >> 8;
+ hash_val ^= hash_val >> 4;
+ hash_val &= PNEIGH_HASHMASK;
+
+ read_lock_bh(&tbl->lock);
+
+ for (n = tbl->phash_buckets[hash_val]; n; n = n->next) {
+ if (!memcmp(n->key, pkey, key_len) &&
+ (n->dev == dev || !n->dev)) {
+ read_unlock_bh(&tbl->lock);
+ goto out;
+ }
+ }
+ read_unlock_bh(&tbl->lock);
+ n = NULL;
+ if (!creat)
+ goto out;
+
+ n = kmalloc(sizeof(*n) + key_len, GFP_KERNEL);
+ if (!n)
+ goto out;
+
+ memcpy(n->key, pkey, key_len);
+ n->dev = dev;
+ if (dev)
+ dev_hold(dev);
+
+ if (tbl->pconstructor && tbl->pconstructor(n)) {
+ if (dev)
+ dev_put(dev);
+ kfree(n);
+ n = NULL;
+ goto out;
+ }
+
+ write_lock_bh(&tbl->lock);
+ n->next = tbl->phash_buckets[hash_val];
+ tbl->phash_buckets[hash_val] = n;
+ write_unlock_bh(&tbl->lock);
+out:
+ return n;
+}
+
+
+int pneigh_delete(struct neigh_table *tbl, const void *pkey,
+ struct net_device *dev)
+{
+ struct pneigh_entry *n, **np;
+ int key_len = tbl->key_len;
+ u32 hash_val = *(u32 *)(pkey + key_len - 4);
+
+ hash_val ^= (hash_val >> 16);
+ hash_val ^= hash_val >> 8;
+ hash_val ^= hash_val >> 4;
+ hash_val &= PNEIGH_HASHMASK;
+
+ write_lock_bh(&tbl->lock);
+ for (np = &tbl->phash_buckets[hash_val]; (n = *np) != NULL;
+ np = &n->next) {
+ if (!memcmp(n->key, pkey, key_len) && n->dev == dev) {
+ *np = n->next;
+ write_unlock_bh(&tbl->lock);
+ if (tbl->pdestructor)
+ tbl->pdestructor(n);
+ if (n->dev)
+ dev_put(n->dev);
+ kfree(n);
+ return 0;
+ }
+ }
+ write_unlock_bh(&tbl->lock);
+ return -ENOENT;
+}
+
+static int pneigh_ifdown(struct neigh_table *tbl, struct net_device *dev)
+{
+ struct pneigh_entry *n, **np;
+ u32 h;
+
+ for (h = 0; h <= PNEIGH_HASHMASK; h++) {
+ np = &tbl->phash_buckets[h];
+ while ((n = *np) != NULL) {
+ if (!dev || n->dev == dev) {
+ *np = n->next;
+ if (tbl->pdestructor)
+ tbl->pdestructor(n);
+ if (n->dev)
+ dev_put(n->dev);
+ kfree(n);
+ continue;
+ }
+ np = &n->next;
+ }
+ }
+ return -ENOENT;
+}
+
+
+/*
+ * neighbour must already be out of the table;
+ *
+ */
+void neigh_destroy(struct neighbour *neigh)
+{
+ struct hh_cache *hh;
+
+ NEIGH_CACHE_STAT_INC(neigh->tbl, destroys);
+
+ if (!neigh->dead) {
+ printk(KERN_WARNING
+ "Destroying alive neighbour %p\n", neigh);
+ dump_stack();
+ return;
+ }
+
+ if (neigh_del_timer(neigh))
+ printk(KERN_WARNING "Impossible event.\n");
+
+ while ((hh = neigh->hh) != NULL) {
+ neigh->hh = hh->hh_next;
+ hh->hh_next = NULL;
+ write_lock_bh(&hh->hh_lock);
+ hh->hh_output = neigh_blackhole;
+ write_unlock_bh(&hh->hh_lock);
+ if (atomic_dec_and_test(&hh->hh_refcnt))
+ kfree(hh);
+ }
+
+ if (neigh->ops && neigh->ops->destructor)
+ (neigh->ops->destructor)(neigh);
+
+ skb_queue_purge(&neigh->arp_queue);
+
+ dev_put(neigh->dev);
+ neigh_parms_put(neigh->parms);
+
+ NEIGH_PRINTK2("neigh %p is destroyed.\n", neigh);
+
+ atomic_dec(&neigh->tbl->entries);
+ kmem_cache_free(neigh->tbl->kmem_cachep, neigh);
+}
+
+/* Neighbour state is suspicious;
+ disable fast path.
+
+ Called with write_locked neigh.
+ */
+static void neigh_suspect(struct neighbour *neigh)
+{
+ struct hh_cache *hh;
+
+ NEIGH_PRINTK2("neigh %p is suspected.\n", neigh);
+
+ neigh->output = neigh->ops->output;
+
+ for (hh = neigh->hh; hh; hh = hh->hh_next)
+ hh->hh_output = neigh->ops->output;
+}
+
+/* Neighbour state is OK;
+ enable fast path.
+
+ Called with write_locked neigh.
+ */
+static void neigh_connect(struct neighbour *neigh)
+{
+ struct hh_cache *hh;
+
+ NEIGH_PRINTK2("neigh %p is connected.\n", neigh);
+
+ neigh->output = neigh->ops->connected_output;
+
+ for (hh = neigh->hh; hh; hh = hh->hh_next)
+ hh->hh_output = neigh->ops->hh_output;
+}
+
+static void neigh_periodic_timer(unsigned long arg)
+{
+ struct neigh_table *tbl = (struct neigh_table *)arg;
+ struct neighbour *n, **np;
+ unsigned long expire, now = jiffies;
+
+ NEIGH_CACHE_STAT_INC(tbl, periodic_gc_runs);
+
+ write_lock(&tbl->lock);
+
+ /*
+ * periodically recompute ReachableTime from random function
+ */
+
+ if (time_after(now, tbl->last_rand + 300 * HZ)) {
+ struct neigh_parms *p;
+ tbl->last_rand = now;
+ for (p = &tbl->parms; p; p = p->next)
+ p->reachable_time =
+ neigh_rand_reach_time(p->base_reachable_time);
+ }
+
+ np = &tbl->hash_buckets[tbl->hash_chain_gc];
+ tbl->hash_chain_gc = ((tbl->hash_chain_gc + 1) & tbl->hash_mask);
+
+ while ((n = *np) != NULL) {
+ unsigned int state;
+
+ write_lock(&n->lock);
+
+ state = n->nud_state;
+ if (state & (NUD_PERMANENT | NUD_IN_TIMER)) {
+ write_unlock(&n->lock);
+ goto next_elt;
+ }
+
+ if (time_before(n->used, n->confirmed))
+ n->used = n->confirmed;
+
+ if (atomic_read(&n->refcnt) == 1 &&
+ (state == NUD_FAILED ||
+ time_after(now, n->used + n->parms->gc_staletime))) {
+ *np = n->next;
+ n->dead = 1;
+ write_unlock(&n->lock);
+ neigh_release(n);
+ continue;
+ }
+ write_unlock(&n->lock);
+
+next_elt:
+ np = &n->next;
+ }
+
+ /* Cycle through all hash buckets every base_reachable_time/2 ticks.
+ * ARP entry timeouts range from 1/2 base_reachable_time to 3/2
+ * base_reachable_time.
+ */
+ expire = tbl->parms.base_reachable_time >> 1;
+ expire /= (tbl->hash_mask + 1);
+ if (!expire)
+ expire = 1;
+
+ mod_timer(&tbl->gc_timer, now + expire);
+
+ write_unlock(&tbl->lock);
+}
+
+static __inline__ int neigh_max_probes(struct neighbour *n)
+{
+ struct neigh_parms *p = n->parms;
+ return (n->nud_state & NUD_PROBE ?
+ p->ucast_probes :
+ p->ucast_probes + p->app_probes + p->mcast_probes);
+}
+
+
+/* Called when a timer expires for a neighbour entry. */
+
+static void neigh_timer_handler(unsigned long arg)
+{
+ unsigned long now, next;
+ struct neighbour *neigh = (struct neighbour *)arg;
+ unsigned state;
+ int notify = 0;
+
+ write_lock(&neigh->lock);
+
+ state = neigh->nud_state;
+ now = jiffies;
+ next = now + HZ;
+
+ if (!(state & NUD_IN_TIMER)) {
+#ifndef CONFIG_SMP
+ printk(KERN_WARNING "neigh: timer & !nud_in_timer\n");
+#endif
+ goto out;
+ }
+
+ if (state & NUD_REACHABLE) {
+ if (time_before_eq(now,
+ neigh->confirmed + neigh->parms->reachable_time)) {
+ NEIGH_PRINTK2("neigh %p is still alive.\n", neigh);
+ next = neigh->confirmed + neigh->parms->reachable_time;
+ } else if (time_before_eq(now,
+ neigh->used + neigh->parms->delay_probe_time)) {
+ NEIGH_PRINTK2("neigh %p is delayed.\n", neigh);
+ neigh->nud_state = NUD_DELAY;
+ neigh_suspect(neigh);
+ next = now + neigh->parms->delay_probe_time;
+ } else {
+ NEIGH_PRINTK2("neigh %p is suspected.\n", neigh);
+ neigh->nud_state = NUD_STALE;
+ neigh_suspect(neigh);
+ }
+ } else if (state & NUD_DELAY) {
+ if (time_before_eq(now,
+ neigh->confirmed + neigh->parms->delay_probe_time)) {
+ NEIGH_PRINTK2("neigh %p is now reachable.\n", neigh);
+ neigh->nud_state = NUD_REACHABLE;
+ neigh_connect(neigh);
+ next = neigh->confirmed + neigh->parms->reachable_time;
+ } else {
+ NEIGH_PRINTK2("neigh %p is probed.\n", neigh);
+ neigh->nud_state = NUD_PROBE;
+ atomic_set(&neigh->probes, 0);
+ next = now + neigh->parms->retrans_time;
+ }
+ } else {
+ /* NUD_PROBE|NUD_INCOMPLETE */
+ next = now + neigh->parms->retrans_time;
+ }
+
+ if ((neigh->nud_state & (NUD_INCOMPLETE | NUD_PROBE)) &&
+ atomic_read(&neigh->probes) >= neigh_max_probes(neigh)) {
+ struct sk_buff *skb;
+
+ neigh->nud_state = NUD_FAILED;
+ notify = 1;
+ NEIGH_CACHE_STAT_INC(neigh->tbl, res_failed);
+ NEIGH_PRINTK2("neigh %p is failed.\n", neigh);
+
+ /* It is very thin place. report_unreachable is very complicated
+ routine. Particularly, it can hit the same neighbour entry!
+
+ So that, we try to be accurate and avoid dead loop. --ANK
+ */
+ while (neigh->nud_state == NUD_FAILED &&
+ (skb = __skb_dequeue(&neigh->arp_queue)) != NULL) {
+ write_unlock(&neigh->lock);
+ neigh->ops->error_report(neigh, skb);
+ write_lock(&neigh->lock);
+ }
+ skb_queue_purge(&neigh->arp_queue);
+ }
+
+ if (neigh->nud_state & NUD_IN_TIMER) {
+ neigh_hold(neigh);
+ if (time_before(next, jiffies + HZ/2))
+ next = jiffies + HZ/2;
+ neigh->timer.expires = next;
+ add_timer(&neigh->timer);
+ }
+ if (neigh->nud_state & (NUD_INCOMPLETE | NUD_PROBE)) {
+ struct sk_buff *skb = skb_peek(&neigh->arp_queue);
+ /* keep skb alive even if arp_queue overflows */
+ if (skb)
+ skb_get(skb);
+ write_unlock(&neigh->lock);
+ neigh->ops->solicit(neigh, skb);
+ atomic_inc(&neigh->probes);
+ if (skb)
+ kfree_skb(skb);
+ } else {
+out:
+ write_unlock(&neigh->lock);
+ }
+
+#ifdef CONFIG_ARPD
+ if (notify && neigh->parms->app_probes)
+ neigh_app_notify(neigh);
+#endif
+ neigh_release(neigh);
+}
+
+int __neigh_event_send(struct neighbour *neigh, struct sk_buff *skb)
+{
+ int rc;
+ unsigned long now;
+
+ write_lock_bh(&neigh->lock);
+
+ rc = 0;
+ if (neigh->nud_state & (NUD_CONNECTED | NUD_DELAY | NUD_PROBE))
+ goto out_unlock_bh;
+
+ now = jiffies;
+
+ if (!(neigh->nud_state & (NUD_STALE | NUD_INCOMPLETE))) {
+ if (neigh->parms->mcast_probes + neigh->parms->app_probes) {
+ atomic_set(&neigh->probes, neigh->parms->ucast_probes);
+ neigh->nud_state = NUD_INCOMPLETE;
+ neigh_hold(neigh);
+ neigh->timer.expires = now + 1;
+ add_timer(&neigh->timer);
+ } else {
+ neigh->nud_state = NUD_FAILED;
+ write_unlock_bh(&neigh->lock);
+
+ if (skb)
+ kfree_skb(skb);
+ return 1;
+ }
+ } else if (neigh->nud_state & NUD_STALE) {
+ NEIGH_PRINTK2("neigh %p is delayed.\n", neigh);
+ neigh_hold(neigh);
+ neigh->nud_state = NUD_DELAY;
+ neigh->timer.expires = jiffies + neigh->parms->delay_probe_time;
+ add_timer(&neigh->timer);
+ }
+
+ if (neigh->nud_state == NUD_INCOMPLETE) {
+ if (skb) {
+ if (skb_queue_len(&neigh->arp_queue) >=
+ neigh->parms->queue_len) {
+ struct sk_buff *buff;
+ buff = neigh->arp_queue.next;
+ __skb_unlink(buff, &neigh->arp_queue);
+ kfree_skb(buff);
+ }
+ __skb_queue_tail(&neigh->arp_queue, skb);
+ }
+ rc = 1;
+ }
+out_unlock_bh:
+ write_unlock_bh(&neigh->lock);
+ return rc;
+}
+
+static __inline__ void neigh_update_hhs(struct neighbour *neigh)
+{
+ struct hh_cache *hh;
+ void (*update)(struct hh_cache*, struct net_device*, unsigned char *) =
+ neigh->dev->header_cache_update;
+
+ if (update) {
+ for (hh = neigh->hh; hh; hh = hh->hh_next) {
+ write_lock_bh(&hh->hh_lock);
+ update(hh, neigh->dev, neigh->ha);
+ write_unlock_bh(&hh->hh_lock);
+ }
+ }
+}
+
+
+
+/* Generic update routine.
+ -- lladdr is new lladdr or NULL, if it is not supplied.
+ -- new is new state.
+ -- flags
+ NEIGH_UPDATE_F_OVERRIDE allows to override existing lladdr,
+ if it is different.
+ NEIGH_UPDATE_F_WEAK_OVERRIDE will suspect existing "connected"
+ lladdr instead of overriding it
+ if it is different.
+ It also allows to retain current state
+ if lladdr is unchanged.
+ NEIGH_UPDATE_F_ADMIN means that the change is administrative.
+
+ NEIGH_UPDATE_F_OVERRIDE_ISROUTER allows to override existing
+ NTF_ROUTER flag.
+ NEIGH_UPDATE_F_ISROUTER indicates if the neighbour is known as
+ a router.
+
+ Caller MUST hold reference count on the entry.
+ */
+
+int neigh_update(struct neighbour *neigh, const u8 *lladdr, u8 new,
+ u32 flags)
+{
+ u8 old;
+ int err;
+#ifdef CONFIG_ARPD
+ int notify = 0;
+#endif
+ struct net_device *dev;
+ int update_isrouter = 0;
+
+ write_lock_bh(&neigh->lock);
+
+ dev = neigh->dev;
+ old = neigh->nud_state;
+ err = -EPERM;
+
+ if (!(flags & NEIGH_UPDATE_F_ADMIN) &&
+ (old & (NUD_NOARP | NUD_PERMANENT)))
+ goto out;
+
+ if (!(new & NUD_VALID)) {
+ neigh_del_timer(neigh);
+ if (old & NUD_CONNECTED)
+ neigh_suspect(neigh);
+ neigh->nud_state = new;
+ err = 0;
+#ifdef CONFIG_ARPD
+ notify = old & NUD_VALID;
+#endif
+ goto out;
+ }
+
+ /* Compare new lladdr with cached one */
+ if (!dev->addr_len) {
+ /* First case: device needs no address. */
+ lladdr = neigh->ha;
+ } else if (lladdr) {
+ /* The second case: if something is already cached
+ and a new address is proposed:
+ - compare new & old
+ - if they are different, check override flag
+ */
+ if ((old & NUD_VALID) &&
+ !memcmp(lladdr, neigh->ha, dev->addr_len))
+ lladdr = neigh->ha;
+ } else {
+ /* No address is supplied; if we know something,
+ use it, otherwise discard the request.
+ */
+ err = -EINVAL;
+ if (!(old & NUD_VALID))
+ goto out;
+ lladdr = neigh->ha;
+ }
+
+ if (new & NUD_CONNECTED)
+ neigh->confirmed = jiffies;
+ neigh->updated = jiffies;
+
+ /* If entry was valid and address is not changed,
+ do not change entry state, if new one is STALE.
+ */
+ err = 0;
+ update_isrouter = flags & NEIGH_UPDATE_F_OVERRIDE_ISROUTER;
+ if (old & NUD_VALID) {
+ if (lladdr != neigh->ha && !(flags & NEIGH_UPDATE_F_OVERRIDE)) {
+ update_isrouter = 0;
+ if ((flags & NEIGH_UPDATE_F_WEAK_OVERRIDE) &&
+ (old & NUD_CONNECTED)) {
+ lladdr = neigh->ha;
+ new = NUD_STALE;
+ } else
+ goto out;
+ } else {
+ if (lladdr == neigh->ha && new == NUD_STALE &&
+ ((flags & NEIGH_UPDATE_F_WEAK_OVERRIDE) ||
+ (old & NUD_CONNECTED))
+ )
+ new = old;
+ }
+ }
+
+ if (new != old) {
+ neigh_del_timer(neigh);
+ if (new & NUD_IN_TIMER) {
+ neigh_hold(neigh);
+ neigh->timer.expires = jiffies +
+ ((new & NUD_REACHABLE) ?
+ neigh->parms->reachable_time : 0);
+ add_timer(&neigh->timer);
+ }
+ neigh->nud_state = new;
+ }
+
+ if (lladdr != neigh->ha) {
+ memcpy(&neigh->ha, lladdr, dev->addr_len);
+ neigh_update_hhs(neigh);
+ if (!(new & NUD_CONNECTED))
+ neigh->confirmed = jiffies -
+ (neigh->parms->base_reachable_time << 1);
+#ifdef CONFIG_ARPD
+ notify = 1;
+#endif
+ }
+ if (new == old)
+ goto out;
+ if (new & NUD_CONNECTED)
+ neigh_connect(neigh);
+ else
+ neigh_suspect(neigh);
+ if (!(old & NUD_VALID)) {
+ struct sk_buff *skb;
+
+ /* Again: avoid dead loop if something went wrong */
+
+ while (neigh->nud_state & NUD_VALID &&
+ (skb = __skb_dequeue(&neigh->arp_queue)) != NULL) {
+ struct neighbour *n1 = neigh;
+ write_unlock_bh(&neigh->lock);
+ /* On shaper/eql skb->dst->neighbour != neigh :( */
+ if (skb->dst && skb->dst->neighbour)
+ n1 = skb->dst->neighbour;
+ n1->output(skb);
+ write_lock_bh(&neigh->lock);
+ }
+ skb_queue_purge(&neigh->arp_queue);
+ }
+out:
+ if (update_isrouter) {
+ neigh->flags = (flags & NEIGH_UPDATE_F_ISROUTER) ?
+ (neigh->flags | NTF_ROUTER) :
+ (neigh->flags & ~NTF_ROUTER);
+ }
+ write_unlock_bh(&neigh->lock);
+#ifdef CONFIG_ARPD
+ if (notify && neigh->parms->app_probes)
+ neigh_app_notify(neigh);
+#endif
+ return err;
+}
+
+struct neighbour *neigh_event_ns(struct neigh_table *tbl,
+ u8 *lladdr, void *saddr,
+ struct net_device *dev)
+{
+ struct neighbour *neigh = __neigh_lookup(tbl, saddr, dev,
+ lladdr || !dev->addr_len);
+ if (neigh)
+ neigh_update(neigh, lladdr, NUD_STALE,
+ NEIGH_UPDATE_F_OVERRIDE);
+ return neigh;
+}
+
+static void neigh_hh_init(struct neighbour *n, struct dst_entry *dst,
+ u16 protocol)
+{
+ struct hh_cache *hh;
+ struct net_device *dev = dst->dev;
+
+ for (hh = n->hh; hh; hh = hh->hh_next)
+ if (hh->hh_type == protocol)
+ break;
+
+ if (!hh && (hh = kmalloc(sizeof(*hh), GFP_ATOMIC)) != NULL) {
+ memset(hh, 0, sizeof(struct hh_cache));
+ rwlock_init(&hh->hh_lock);
+ hh->hh_type = protocol;
+ atomic_set(&hh->hh_refcnt, 0);
+ hh->hh_next = NULL;
+ if (dev->hard_header_cache(n, hh)) {
+ kfree(hh);
+ hh = NULL;
+ } else {
+ atomic_inc(&hh->hh_refcnt);
+ hh->hh_next = n->hh;
+ n->hh = hh;
+ if (n->nud_state & NUD_CONNECTED)
+ hh->hh_output = n->ops->hh_output;
+ else
+ hh->hh_output = n->ops->output;
+ }
+ }
+ if (hh) {
+ atomic_inc(&hh->hh_refcnt);
+ dst->hh = hh;
+ }
+}
+
+/* This function can be used in contexts, where only old dev_queue_xmit
+ worked, f.e. if you want to override normal output path (eql, shaper),
+ but resolution is not made yet.
+ */
+
+int neigh_compat_output(struct sk_buff *skb)
+{
+ struct net_device *dev = skb->dev;
+
+ __skb_pull(skb, skb->nh.raw - skb->data);
+
+ if (dev->hard_header &&
+ dev->hard_header(skb, dev, ntohs(skb->protocol), NULL, NULL,
+ skb->len) < 0 &&
+ dev->rebuild_header(skb))
+ return 0;
+
+ return dev_queue_xmit(skb);
+}
+
+/* Slow and careful. */
+
+int neigh_resolve_output(struct sk_buff *skb)
+{
+ struct dst_entry *dst = skb->dst;
+ struct neighbour *neigh;
+ int rc = 0;
+
+ if (!dst || !(neigh = dst->neighbour))
+ goto discard;
+
+ __skb_pull(skb, skb->nh.raw - skb->data);
+
+ if (!neigh_event_send(neigh, skb)) {
+ int err;
+ struct net_device *dev = neigh->dev;
+ if (dev->hard_header_cache && !dst->hh) {
+ write_lock_bh(&neigh->lock);
+ if (!dst->hh)
+ neigh_hh_init(neigh, dst, dst->ops->protocol);
+ err = dev->hard_header(skb, dev, ntohs(skb->protocol),
+ neigh->ha, NULL, skb->len);
+ write_unlock_bh(&neigh->lock);
+ } else {
+ read_lock_bh(&neigh->lock);
+ err = dev->hard_header(skb, dev, ntohs(skb->protocol),
+ neigh->ha, NULL, skb->len);
+ read_unlock_bh(&neigh->lock);
+ }
+ if (err >= 0)
+ rc = neigh->ops->queue_xmit(skb);
+ else
+ goto out_kfree_skb;
+ }
+out:
+ return rc;
+discard:
+ NEIGH_PRINTK1("neigh_resolve_output: dst=%p neigh=%p\n",
+ dst, dst ? dst->neighbour : NULL);
+out_kfree_skb:
+ rc = -EINVAL;
+ kfree_skb(skb);
+ goto out;
+}
+
+/* As fast as possible without hh cache */
+
+int neigh_connected_output(struct sk_buff *skb)
+{
+ int err;
+ struct dst_entry *dst = skb->dst;
+ struct neighbour *neigh = dst->neighbour;
+ struct net_device *dev = neigh->dev;
+
+ __skb_pull(skb, skb->nh.raw - skb->data);
+
+ read_lock_bh(&neigh->lock);
+ err = dev->hard_header(skb, dev, ntohs(skb->protocol),
+ neigh->ha, NULL, skb->len);
+ read_unlock_bh(&neigh->lock);
+ if (err >= 0)
+ err = neigh->ops->queue_xmit(skb);
+ else {
+ err = -EINVAL;
+ kfree_skb(skb);
+ }
+ return err;
+}
+
+static void neigh_proxy_process(unsigned long arg)
+{
+ struct neigh_table *tbl = (struct neigh_table *)arg;
+ long sched_next = 0;
+ unsigned long now = jiffies;
+ struct sk_buff *skb;
+
+ spin_lock(&tbl->proxy_queue.lock);
+
+ skb = tbl->proxy_queue.next;
+
+ while (skb != (struct sk_buff *)&tbl->proxy_queue) {
+ struct sk_buff *back = skb;
+ long tdif = back->stamp.tv_usec - now;
+
+ skb = skb->next;
+ if (tdif <= 0) {
+ struct net_device *dev = back->dev;
+ __skb_unlink(back, &tbl->proxy_queue);
+ if (tbl->proxy_redo && netif_running(dev))
+ tbl->proxy_redo(back);
+ else
+ kfree_skb(back);
+
+ dev_put(dev);
+ } else if (!sched_next || tdif < sched_next)
+ sched_next = tdif;
+ }
+ del_timer(&tbl->proxy_timer);
+ if (sched_next)
+ mod_timer(&tbl->proxy_timer, jiffies + sched_next);
+ spin_unlock(&tbl->proxy_queue.lock);
+}
+
+void pneigh_enqueue(struct neigh_table *tbl, struct neigh_parms *p,
+ struct sk_buff *skb)
+{
+ unsigned long now = jiffies;
+ unsigned long sched_next = now + (net_random() % p->proxy_delay);
+
+ if (tbl->proxy_queue.qlen > p->proxy_qlen) {
+ kfree_skb(skb);
+ return;
+ }
+ skb->stamp.tv_sec = LOCALLY_ENQUEUED;
+ skb->stamp.tv_usec = sched_next;
+
+ spin_lock(&tbl->proxy_queue.lock);
+ if (del_timer(&tbl->proxy_timer)) {
+ if (time_before(tbl->proxy_timer.expires, sched_next))
+ sched_next = tbl->proxy_timer.expires;
+ }
+ dst_release(skb->dst);
+ skb->dst = NULL;
+ dev_hold(skb->dev);
+ __skb_queue_tail(&tbl->proxy_queue, skb);
+ mod_timer(&tbl->proxy_timer, sched_next);
+ spin_unlock(&tbl->proxy_queue.lock);
+}
+
+
+struct neigh_parms *neigh_parms_alloc(struct net_device *dev,
+ struct neigh_table *tbl)
+{
+ struct neigh_parms *p = kmalloc(sizeof(*p), GFP_KERNEL);
+
+ if (p) {
+ memcpy(p, &tbl->parms, sizeof(*p));
+ p->tbl = tbl;
+ atomic_set(&p->refcnt, 1);
+ INIT_RCU_HEAD(&p->rcu_head);
+ p->reachable_time =
+ neigh_rand_reach_time(p->base_reachable_time);
+ if (dev && dev->neigh_setup && dev->neigh_setup(dev, p)) {
+ kfree(p);
+ return NULL;
+ }
+ p->sysctl_table = NULL;
+ write_lock_bh(&tbl->lock);
+ p->next = tbl->parms.next;
+ tbl->parms.next = p;
+ write_unlock_bh(&tbl->lock);
+ }
+ return p;
+}
+
+static void neigh_rcu_free_parms(struct rcu_head *head)
+{
+ struct neigh_parms *parms =
+ container_of(head, struct neigh_parms, rcu_head);
+
+ neigh_parms_put(parms);
+}
+
+void neigh_parms_release(struct neigh_table *tbl, struct neigh_parms *parms)
+{
+ struct neigh_parms **p;
+
+ if (!parms || parms == &tbl->parms)
+ return;
+ write_lock_bh(&tbl->lock);
+ for (p = &tbl->parms.next; *p; p = &(*p)->next) {
+ if (*p == parms) {
+ *p = parms->next;
+ parms->dead = 1;
+ write_unlock_bh(&tbl->lock);
+ call_rcu(&parms->rcu_head, neigh_rcu_free_parms);
+ return;
+ }
+ }
+ write_unlock_bh(&tbl->lock);
+ NEIGH_PRINTK1("neigh_parms_release: not found\n");
+}
+
+void neigh_parms_destroy(struct neigh_parms *parms)
+{
+ kfree(parms);
+}
+
+
+void neigh_table_init(struct neigh_table *tbl)
+{
+ unsigned long now = jiffies;
+ unsigned long phsize;
+
+ atomic_set(&tbl->parms.refcnt, 1);
+ INIT_RCU_HEAD(&tbl->parms.rcu_head);
+ tbl->parms.reachable_time =
+ neigh_rand_reach_time(tbl->parms.base_reachable_time);
+
+ if (!tbl->kmem_cachep)
+ tbl->kmem_cachep = kmem_cache_create(tbl->id,
+ tbl->entry_size,
+ 0, SLAB_HWCACHE_ALIGN,
+ NULL, NULL);
+
+ if (!tbl->kmem_cachep)
+ panic("cannot create neighbour cache");
+
+ tbl->stats = alloc_percpu(struct neigh_statistics);
+ if (!tbl->stats)
+ panic("cannot create neighbour cache statistics");
+
+#ifdef CONFIG_PROC_FS
+ tbl->pde = create_proc_entry(tbl->id, 0, proc_net_stat);
+ if (!tbl->pde)
+ panic("cannot create neighbour proc dir entry");
+ tbl->pde->proc_fops = &neigh_stat_seq_fops;
+ tbl->pde->data = tbl;
+#endif
+
+ tbl->hash_mask = 1;
+ tbl->hash_buckets = neigh_hash_alloc(tbl->hash_mask + 1);
+
+ phsize = (PNEIGH_HASHMASK + 1) * sizeof(struct pneigh_entry *);
+ tbl->phash_buckets = kmalloc(phsize, GFP_KERNEL);
+
+ if (!tbl->hash_buckets || !tbl->phash_buckets)
+ panic("cannot allocate neighbour cache hashes");
+
+ memset(tbl->phash_buckets, 0, phsize);
+
+ get_random_bytes(&tbl->hash_rnd, sizeof(tbl->hash_rnd));
+
+ rwlock_init(&tbl->lock);
+ init_timer(&tbl->gc_timer);
+ tbl->gc_timer.data = (unsigned long)tbl;
+ tbl->gc_timer.function = neigh_periodic_timer;
+ tbl->gc_timer.expires = now + 1;
+ add_timer(&tbl->gc_timer);
+
+ init_timer(&tbl->proxy_timer);
+ tbl->proxy_timer.data = (unsigned long)tbl;
+ tbl->proxy_timer.function = neigh_proxy_process;
+ skb_queue_head_init(&tbl->proxy_queue);
+
+ tbl->last_flush = now;
+ tbl->last_rand = now + tbl->parms.reachable_time * 20;
+ write_lock(&neigh_tbl_lock);
+ tbl->next = neigh_tables;
+ neigh_tables = tbl;
+ write_unlock(&neigh_tbl_lock);
+}
+
+int neigh_table_clear(struct neigh_table *tbl)
+{
+ struct neigh_table **tp;
+
+ /* It is not clean... Fix it to unload IPv6 module safely */
+ del_timer_sync(&tbl->gc_timer);
+ del_timer_sync(&tbl->proxy_timer);
+ pneigh_queue_purge(&tbl->proxy_queue);
+ neigh_ifdown(tbl, NULL);
+ if (atomic_read(&tbl->entries))
+ printk(KERN_CRIT "neighbour leakage\n");
+ write_lock(&neigh_tbl_lock);
+ for (tp = &neigh_tables; *tp; tp = &(*tp)->next) {
+ if (*tp == tbl) {
+ *tp = tbl->next;
+ break;
+ }
+ }
+ write_unlock(&neigh_tbl_lock);
+
+ neigh_hash_free(tbl->hash_buckets, tbl->hash_mask + 1);
+ tbl->hash_buckets = NULL;
+
+ kfree(tbl->phash_buckets);
+ tbl->phash_buckets = NULL;
+
+ return 0;
+}
+
+int neigh_delete(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
+{
+ struct ndmsg *ndm = NLMSG_DATA(nlh);
+ struct rtattr **nda = arg;
+ struct neigh_table *tbl;
+ struct net_device *dev = NULL;
+ int err = -ENODEV;
+
+ if (ndm->ndm_ifindex &&
+ (dev = dev_get_by_index(ndm->ndm_ifindex)) == NULL)
+ goto out;
+
+ read_lock(&neigh_tbl_lock);
+ for (tbl = neigh_tables; tbl; tbl = tbl->next) {
+ struct rtattr *dst_attr = nda[NDA_DST - 1];
+ struct neighbour *n;
+
+ if (tbl->family != ndm->ndm_family)
+ continue;
+ read_unlock(&neigh_tbl_lock);
+
+ err = -EINVAL;
+ if (!dst_attr || RTA_PAYLOAD(dst_attr) < tbl->key_len)
+ goto out_dev_put;
+
+ if (ndm->ndm_flags & NTF_PROXY) {
+ err = pneigh_delete(tbl, RTA_DATA(dst_attr), dev);
+ goto out_dev_put;
+ }
+
+ if (!dev)
+ goto out;
+
+ n = neigh_lookup(tbl, RTA_DATA(dst_attr), dev);
+ if (n) {
+ err = neigh_update(n, NULL, NUD_FAILED,
+ NEIGH_UPDATE_F_OVERRIDE|
+ NEIGH_UPDATE_F_ADMIN);
+ neigh_release(n);
+ }
+ goto out_dev_put;
+ }
+ read_unlock(&neigh_tbl_lock);
+ err = -EADDRNOTAVAIL;
+out_dev_put:
+ if (dev)
+ dev_put(dev);
+out:
+ return err;
+}
+
+int neigh_add(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
+{
+ struct ndmsg *ndm = NLMSG_DATA(nlh);
+ struct rtattr **nda = arg;
+ struct neigh_table *tbl;
+ struct net_device *dev = NULL;
+ int err = -ENODEV;
+
+ if (ndm->ndm_ifindex &&
+ (dev = dev_get_by_index(ndm->ndm_ifindex)) == NULL)
+ goto out;
+
+ read_lock(&neigh_tbl_lock);
+ for (tbl = neigh_tables; tbl; tbl = tbl->next) {
+ struct rtattr *lladdr_attr = nda[NDA_LLADDR - 1];
+ struct rtattr *dst_attr = nda[NDA_DST - 1];
+ int override = 1;
+ struct neighbour *n;
+
+ if (tbl->family != ndm->ndm_family)
+ continue;
+ read_unlock(&neigh_tbl_lock);
+
+ err = -EINVAL;
+ if (!dst_attr || RTA_PAYLOAD(dst_attr) < tbl->key_len)
+ goto out_dev_put;
+
+ if (ndm->ndm_flags & NTF_PROXY) {
+ err = -ENOBUFS;
+ if (pneigh_lookup(tbl, RTA_DATA(dst_attr), dev, 1))
+ err = 0;
+ goto out_dev_put;
+ }
+
+ err = -EINVAL;
+ if (!dev)
+ goto out;
+ if (lladdr_attr && RTA_PAYLOAD(lladdr_attr) < dev->addr_len)
+ goto out_dev_put;
+
+ n = neigh_lookup(tbl, RTA_DATA(dst_attr), dev);
+ if (n) {
+ if (nlh->nlmsg_flags & NLM_F_EXCL) {
+ err = -EEXIST;
+ neigh_release(n);
+ goto out_dev_put;
+ }
+
+ override = nlh->nlmsg_flags & NLM_F_REPLACE;
+ } else if (!(nlh->nlmsg_flags & NLM_F_CREATE)) {
+ err = -ENOENT;
+ goto out_dev_put;
+ } else {
+ n = __neigh_lookup_errno(tbl, RTA_DATA(dst_attr), dev);
+ if (IS_ERR(n)) {
+ err = PTR_ERR(n);
+ goto out_dev_put;
+ }
+ }
+
+ err = neigh_update(n,
+ lladdr_attr ? RTA_DATA(lladdr_attr) : NULL,
+ ndm->ndm_state,
+ (override ? NEIGH_UPDATE_F_OVERRIDE : 0) |
+ NEIGH_UPDATE_F_ADMIN);
+
+ neigh_release(n);
+ goto out_dev_put;
+ }
+
+ read_unlock(&neigh_tbl_lock);
+ err = -EADDRNOTAVAIL;
+out_dev_put:
+ if (dev)
+ dev_put(dev);
+out:
+ return err;
+}
+
+
+static int neigh_fill_info(struct sk_buff *skb, struct neighbour *n,
+ u32 pid, u32 seq, int event)
+{
+ unsigned long now = jiffies;
+ unsigned char *b = skb->tail;
+ struct nda_cacheinfo ci;
+ int locked = 0;
+ u32 probes;
+ struct nlmsghdr *nlh = NLMSG_PUT(skb, pid, seq, event,
+ sizeof(struct ndmsg));
+ struct ndmsg *ndm = NLMSG_DATA(nlh);
+
+ nlh->nlmsg_flags = pid ? NLM_F_MULTI : 0;
+ ndm->ndm_family = n->ops->family;
+ ndm->ndm_flags = n->flags;
+ ndm->ndm_type = n->type;
+ ndm->ndm_ifindex = n->dev->ifindex;
+ RTA_PUT(skb, NDA_DST, n->tbl->key_len, n->primary_key);
+ read_lock_bh(&n->lock);
+ locked = 1;
+ ndm->ndm_state = n->nud_state;
+ if (n->nud_state & NUD_VALID)
+ RTA_PUT(skb, NDA_LLADDR, n->dev->addr_len, n->ha);
+ ci.ndm_used = now - n->used;
+ ci.ndm_confirmed = now - n->confirmed;
+ ci.ndm_updated = now - n->updated;
+ ci.ndm_refcnt = atomic_read(&n->refcnt) - 1;
+ probes = atomic_read(&n->probes);
+ read_unlock_bh(&n->lock);
+ locked = 0;
+ RTA_PUT(skb, NDA_CACHEINFO, sizeof(ci), &ci);
+ RTA_PUT(skb, NDA_PROBES, sizeof(probes), &probes);
+ nlh->nlmsg_len = skb->tail - b;
+ return skb->len;
+
+nlmsg_failure:
+rtattr_failure:
+ if (locked)
+ read_unlock_bh(&n->lock);
+ skb_trim(skb, b - skb->data);
+ return -1;
+}
+
+
+static int neigh_dump_table(struct neigh_table *tbl, struct sk_buff *skb,
+ struct netlink_callback *cb)
+{
+ struct neighbour *n;
+ int rc, h, s_h = cb->args[1];
+ int idx, s_idx = idx = cb->args[2];
+
+ for (h = 0; h <= tbl->hash_mask; h++) {
+ if (h < s_h)
+ continue;
+ if (h > s_h)
+ s_idx = 0;
+ read_lock_bh(&tbl->lock);
+ for (n = tbl->hash_buckets[h], idx = 0; n; n = n->next, idx++) {
+ if (idx < s_idx)
+ continue;
+ if (neigh_fill_info(skb, n, NETLINK_CB(cb->skb).pid,
+ cb->nlh->nlmsg_seq,
+ RTM_NEWNEIGH) <= 0) {
+ read_unlock_bh(&tbl->lock);
+ rc = -1;
+ goto out;
+ }
+ }
+ read_unlock_bh(&tbl->lock);
+ }
+ rc = skb->len;
+out:
+ cb->args[1] = h;
+ cb->args[2] = idx;
+ return rc;
+}
+
+int neigh_dump_info(struct sk_buff *skb, struct netlink_callback *cb)
+{
+ struct neigh_table *tbl;
+ int t, family, s_t;
+
+ read_lock(&neigh_tbl_lock);
+ family = ((struct rtgenmsg *)NLMSG_DATA(cb->nlh))->rtgen_family;
+ s_t = cb->args[0];
+
+ for (tbl = neigh_tables, t = 0; tbl; tbl = tbl->next, t++) {
+ if (t < s_t || (family && tbl->family != family))
+ continue;
+ if (t > s_t)
+ memset(&cb->args[1], 0, sizeof(cb->args) -
+ sizeof(cb->args[0]));
+ if (neigh_dump_table(tbl, skb, cb) < 0)
+ break;
+ }
+ read_unlock(&neigh_tbl_lock);
+
+ cb->args[0] = t;
+ return skb->len;
+}
+
+void neigh_for_each(struct neigh_table *tbl, void (*cb)(struct neighbour *, void *), void *cookie)
+{
+ int chain;
+
+ read_lock_bh(&tbl->lock);
+ for (chain = 0; chain <= tbl->hash_mask; chain++) {
+ struct neighbour *n;
+
+ for (n = tbl->hash_buckets[chain]; n; n = n->next)
+ cb(n, cookie);
+ }
+ read_unlock_bh(&tbl->lock);
+}
+EXPORT_SYMBOL(neigh_for_each);
+
+/* The tbl->lock must be held as a writer and BH disabled. */
+void __neigh_for_each_release(struct neigh_table *tbl,
+ int (*cb)(struct neighbour *))
+{
+ int chain;
+
+ for (chain = 0; chain <= tbl->hash_mask; chain++) {
+ struct neighbour *n, **np;
+
+ np = &tbl->hash_buckets[chain];
+ while ((n = *np) != NULL) {
+ int release;
+
+ write_lock(&n->lock);
+ release = cb(n);
+ if (release) {
+ *np = n->next;
+ n->dead = 1;
+ } else
+ np = &n->next;
+ write_unlock(&n->lock);
+ if (release)
+ neigh_release(n);
+ }
+ }
+}
+EXPORT_SYMBOL(__neigh_for_each_release);
+
+#ifdef CONFIG_PROC_FS
+
+static struct neighbour *neigh_get_first(struct seq_file *seq)
+{
+ struct neigh_seq_state *state = seq->private;
+ struct neigh_table *tbl = state->tbl;
+ struct neighbour *n = NULL;
+ int bucket = state->bucket;
+
+ state->flags &= ~NEIGH_SEQ_IS_PNEIGH;
+ for (bucket = 0; bucket <= tbl->hash_mask; bucket++) {
+ n = tbl->hash_buckets[bucket];
+
+ while (n) {
+ if (state->neigh_sub_iter) {
+ loff_t fakep = 0;
+ void *v;
+
+ v = state->neigh_sub_iter(state, n, &fakep);
+ if (!v)
+ goto next;
+ }
+ if (!(state->flags & NEIGH_SEQ_SKIP_NOARP))
+ break;
+ if (n->nud_state & ~NUD_NOARP)
+ break;
+ next:
+ n = n->next;
+ }
+
+ if (n)
+ break;
+ }
+ state->bucket = bucket;
+
+ return n;
+}
+
+static struct neighbour *neigh_get_next(struct seq_file *seq,
+ struct neighbour *n,
+ loff_t *pos)
+{
+ struct neigh_seq_state *state = seq->private;
+ struct neigh_table *tbl = state->tbl;
+
+ if (state->neigh_sub_iter) {
+ void *v = state->neigh_sub_iter(state, n, pos);
+ if (v)
+ return n;
+ }
+ n = n->next;
+
+ while (1) {
+ while (n) {
+ if (state->neigh_sub_iter) {
+ void *v = state->neigh_sub_iter(state, n, pos);
+ if (v)
+ return n;
+ goto next;
+ }
+ if (!(state->flags & NEIGH_SEQ_SKIP_NOARP))
+ break;
+
+ if (n->nud_state & ~NUD_NOARP)
+ break;
+ next:
+ n = n->next;
+ }
+
+ if (n)
+ break;
+
+ if (++state->bucket > tbl->hash_mask)
+ break;
+
+ n = tbl->hash_buckets[state->bucket];
+ }
+
+ if (n && pos)
+ --(*pos);
+ return n;
+}
+
+static struct neighbour *neigh_get_idx(struct seq_file *seq, loff_t *pos)
+{
+ struct neighbour *n = neigh_get_first(seq);
+
+ if (n) {
+ while (*pos) {
+ n = neigh_get_next(seq, n, pos);
+ if (!n)
+ break;
+ }
+ }
+ return *pos ? NULL : n;
+}
+
+static struct pneigh_entry *pneigh_get_first(struct seq_file *seq)
+{
+ struct neigh_seq_state *state = seq->private;
+ struct neigh_table *tbl = state->tbl;
+ struct pneigh_entry *pn = NULL;
+ int bucket = state->bucket;
+
+ state->flags |= NEIGH_SEQ_IS_PNEIGH;
+ for (bucket = 0; bucket <= PNEIGH_HASHMASK; bucket++) {
+ pn = tbl->phash_buckets[bucket];
+ if (pn)
+ break;
+ }
+ state->bucket = bucket;
+
+ return pn;
+}
+
+static struct pneigh_entry *pneigh_get_next(struct seq_file *seq,
+ struct pneigh_entry *pn,
+ loff_t *pos)
+{
+ struct neigh_seq_state *state = seq->private;
+ struct neigh_table *tbl = state->tbl;
+
+ pn = pn->next;
+ while (!pn) {
+ if (++state->bucket > PNEIGH_HASHMASK)
+ break;
+ pn = tbl->phash_buckets[state->bucket];
+ if (pn)
+ break;
+ }
+
+ if (pn && pos)
+ --(*pos);
+
+ return pn;
+}
+
+static struct pneigh_entry *pneigh_get_idx(struct seq_file *seq, loff_t *pos)
+{
+ struct pneigh_entry *pn = pneigh_get_first(seq);
+
+ if (pn) {
+ while (*pos) {
+ pn = pneigh_get_next(seq, pn, pos);
+ if (!pn)
+ break;
+ }
+ }
+ return *pos ? NULL : pn;
+}
+
+static void *neigh_get_idx_any(struct seq_file *seq, loff_t *pos)
+{
+ struct neigh_seq_state *state = seq->private;
+ void *rc;
+
+ rc = neigh_get_idx(seq, pos);
+ if (!rc && !(state->flags & NEIGH_SEQ_NEIGH_ONLY))
+ rc = pneigh_get_idx(seq, pos);
+
+ return rc;
+}
+
+void *neigh_seq_start(struct seq_file *seq, loff_t *pos, struct neigh_table *tbl, unsigned int neigh_seq_flags)
+{
+ struct neigh_seq_state *state = seq->private;
+ loff_t pos_minus_one;
+
+ state->tbl = tbl;
+ state->bucket = 0;
+ state->flags = (neigh_seq_flags & ~NEIGH_SEQ_IS_PNEIGH);
+
+ read_lock_bh(&tbl->lock);
+
+ pos_minus_one = *pos - 1;
+ return *pos ? neigh_get_idx_any(seq, &pos_minus_one) : SEQ_START_TOKEN;
+}
+EXPORT_SYMBOL(neigh_seq_start);
+
+void *neigh_seq_next(struct seq_file *seq, void *v, loff_t *pos)
+{
+ struct neigh_seq_state *state;
+ void *rc;
+
+ if (v == SEQ_START_TOKEN) {
+ rc = neigh_get_idx(seq, pos);
+ goto out;
+ }
+
+ state = seq->private;
+ if (!(state->flags & NEIGH_SEQ_IS_PNEIGH)) {
+ rc = neigh_get_next(seq, v, NULL);
+ if (rc)
+ goto out;
+ if (!(state->flags & NEIGH_SEQ_NEIGH_ONLY))
+ rc = pneigh_get_first(seq);
+ } else {
+ BUG_ON(state->flags & NEIGH_SEQ_NEIGH_ONLY);
+ rc = pneigh_get_next(seq, v, NULL);
+ }
+out:
+ ++(*pos);
+ return rc;
+}
+EXPORT_SYMBOL(neigh_seq_next);
+
+void neigh_seq_stop(struct seq_file *seq, void *v)
+{
+ struct neigh_seq_state *state = seq->private;
+ struct neigh_table *tbl = state->tbl;
+
+ read_unlock_bh(&tbl->lock);
+}
+EXPORT_SYMBOL(neigh_seq_stop);
+
+/* statistics via seq_file */
+
+static void *neigh_stat_seq_start(struct seq_file *seq, loff_t *pos)
+{
+ struct proc_dir_entry *pde = seq->private;
+ struct neigh_table *tbl = pde->data;
+ int cpu;
+
+ if (*pos == 0)
+ return SEQ_START_TOKEN;
+
+ for (cpu = *pos-1; cpu < NR_CPUS; ++cpu) {
+ if (!cpu_possible(cpu))
+ continue;
+ *pos = cpu+1;
+ return per_cpu_ptr(tbl->stats, cpu);
+ }
+ return NULL;
+}
+
+static void *neigh_stat_seq_next(struct seq_file *seq, void *v, loff_t *pos)
+{
+ struct proc_dir_entry *pde = seq->private;
+ struct neigh_table *tbl = pde->data;
+ int cpu;
+
+ for (cpu = *pos; cpu < NR_CPUS; ++cpu) {
+ if (!cpu_possible(cpu))
+ continue;
+ *pos = cpu+1;
+ return per_cpu_ptr(tbl->stats, cpu);
+ }
+ return NULL;
+}
+
+static void neigh_stat_seq_stop(struct seq_file *seq, void *v)
+{
+
+}
+
+static int neigh_stat_seq_show(struct seq_file *seq, void *v)
+{
+ struct proc_dir_entry *pde = seq->private;
+ struct neigh_table *tbl = pde->data;
+ struct neigh_statistics *st = v;
+
+ if (v == SEQ_START_TOKEN) {
+ seq_printf(seq, "entries allocs destroys hash_grows lookups hits res_failed rcv_probes_mcast rcv_probes_ucast periodic_gc_runs forced_gc_runs forced_gc_goal_miss\n");
+ return 0;
+ }
+
+ seq_printf(seq, "%08x %08lx %08lx %08lx %08lx %08lx %08lx "
+ "%08lx %08lx %08lx %08lx\n",
+ atomic_read(&tbl->entries),
+
+ st->allocs,
+ st->destroys,
+ st->hash_grows,
+
+ st->lookups,
+ st->hits,
+
+ st->res_failed,
+
+ st->rcv_probes_mcast,
+ st->rcv_probes_ucast,
+
+ st->periodic_gc_runs,
+ st->forced_gc_runs
+ );
+
+ return 0;
+}
+
+static struct seq_operations neigh_stat_seq_ops = {
+ .start = neigh_stat_seq_start,
+ .next = neigh_stat_seq_next,
+ .stop = neigh_stat_seq_stop,
+ .show = neigh_stat_seq_show,
+};
+
+static int neigh_stat_seq_open(struct inode *inode, struct file *file)
+{
+ int ret = seq_open(file, &neigh_stat_seq_ops);
+
+ if (!ret) {
+ struct seq_file *sf = file->private_data;
+ sf->private = PDE(inode);
+ }
+ return ret;
+};
+
+static struct file_operations neigh_stat_seq_fops = {
+ .owner = THIS_MODULE,
+ .open = neigh_stat_seq_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = seq_release,
+};
+
+#endif /* CONFIG_PROC_FS */
+
+#ifdef CONFIG_ARPD
+void neigh_app_ns(struct neighbour *n)
+{
+ struct nlmsghdr *nlh;
+ int size = NLMSG_SPACE(sizeof(struct ndmsg) + 256);
+ struct sk_buff *skb = alloc_skb(size, GFP_ATOMIC);
+
+ if (!skb)
+ return;
+
+ if (neigh_fill_info(skb, n, 0, 0, RTM_GETNEIGH) < 0) {
+ kfree_skb(skb);
+ return;
+ }
+ nlh = (struct nlmsghdr *)skb->data;
+ nlh->nlmsg_flags = NLM_F_REQUEST;
+ NETLINK_CB(skb).dst_groups = RTMGRP_NEIGH;
+ netlink_broadcast(rtnl, skb, 0, RTMGRP_NEIGH, GFP_ATOMIC);
+}
+
+static void neigh_app_notify(struct neighbour *n)
+{
+ struct nlmsghdr *nlh;
+ int size = NLMSG_SPACE(sizeof(struct ndmsg) + 256);
+ struct sk_buff *skb = alloc_skb(size, GFP_ATOMIC);
+
+ if (!skb)
+ return;
+
+ if (neigh_fill_info(skb, n, 0, 0, RTM_NEWNEIGH) < 0) {
+ kfree_skb(skb);
+ return;
+ }
+ nlh = (struct nlmsghdr *)skb->data;
+ NETLINK_CB(skb).dst_groups = RTMGRP_NEIGH;
+ netlink_broadcast(rtnl, skb, 0, RTMGRP_NEIGH, GFP_ATOMIC);
+}
+
+#endif /* CONFIG_ARPD */
+
+#ifdef CONFIG_SYSCTL
+
+static struct neigh_sysctl_table {
+ struct ctl_table_header *sysctl_header;
+ ctl_table neigh_vars[__NET_NEIGH_MAX];
+ ctl_table neigh_dev[2];
+ ctl_table neigh_neigh_dir[2];
+ ctl_table neigh_proto_dir[2];
+ ctl_table neigh_root_dir[2];
+} neigh_sysctl_template = {
+ .neigh_vars = {
+ {
+ .ctl_name = NET_NEIGH_MCAST_SOLICIT,
+ .procname = "mcast_solicit",
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec,
+ },
+ {
+ .ctl_name = NET_NEIGH_UCAST_SOLICIT,
+ .procname = "ucast_solicit",
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec,
+ },
+ {
+ .ctl_name = NET_NEIGH_APP_SOLICIT,
+ .procname = "app_solicit",
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec,
+ },
+ {
+ .ctl_name = NET_NEIGH_RETRANS_TIME,
+ .procname = "retrans_time",
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec_userhz_jiffies,
+ },
+ {
+ .ctl_name = NET_NEIGH_REACHABLE_TIME,
+ .procname = "base_reachable_time",
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec_jiffies,
+ .strategy = &sysctl_jiffies,
+ },
+ {
+ .ctl_name = NET_NEIGH_DELAY_PROBE_TIME,
+ .procname = "delay_first_probe_time",
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec_jiffies,
+ .strategy = &sysctl_jiffies,
+ },
+ {
+ .ctl_name = NET_NEIGH_GC_STALE_TIME,
+ .procname = "gc_stale_time",
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec_jiffies,
+ .strategy = &sysctl_jiffies,
+ },
+ {
+ .ctl_name = NET_NEIGH_UNRES_QLEN,
+ .procname = "unres_qlen",
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec,
+ },
+ {
+ .ctl_name = NET_NEIGH_PROXY_QLEN,
+ .procname = "proxy_qlen",
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec,
+ },
+ {
+ .ctl_name = NET_NEIGH_ANYCAST_DELAY,
+ .procname = "anycast_delay",
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec_userhz_jiffies,
+ },
+ {
+ .ctl_name = NET_NEIGH_PROXY_DELAY,
+ .procname = "proxy_delay",
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec_userhz_jiffies,
+ },
+ {
+ .ctl_name = NET_NEIGH_LOCKTIME,
+ .procname = "locktime",
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec_userhz_jiffies,
+ },
+ {
+ .ctl_name = NET_NEIGH_GC_INTERVAL,
+ .procname = "gc_interval",
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec_jiffies,
+ .strategy = &sysctl_jiffies,
+ },
+ {
+ .ctl_name = NET_NEIGH_GC_THRESH1,
+ .procname = "gc_thresh1",
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec,
+ },
+ {
+ .ctl_name = NET_NEIGH_GC_THRESH2,
+ .procname = "gc_thresh2",
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec,
+ },
+ {
+ .ctl_name = NET_NEIGH_GC_THRESH3,
+ .procname = "gc_thresh3",
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec,
+ },
+ {
+ .ctl_name = NET_NEIGH_RETRANS_TIME_MS,
+ .procname = "retrans_time_ms",
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec_ms_jiffies,
+ .strategy = &sysctl_ms_jiffies,
+ },
+ {
+ .ctl_name = NET_NEIGH_REACHABLE_TIME_MS,
+ .procname = "base_reachable_time_ms",
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec_ms_jiffies,
+ .strategy = &sysctl_ms_jiffies,
+ },
+ },
+ .neigh_dev = {
+ {
+ .ctl_name = NET_PROTO_CONF_DEFAULT,
+ .procname = "default",
+ .mode = 0555,
+ },
+ },
+ .neigh_neigh_dir = {
+ {
+ .procname = "neigh",
+ .mode = 0555,
+ },
+ },
+ .neigh_proto_dir = {
+ {
+ .mode = 0555,
+ },
+ },
+ .neigh_root_dir = {
+ {
+ .ctl_name = CTL_NET,
+ .procname = "net",
+ .mode = 0555,
+ },
+ },
+};
+
+int neigh_sysctl_register(struct net_device *dev, struct neigh_parms *p,
+ int p_id, int pdev_id, char *p_name,
+ proc_handler *handler, ctl_handler *strategy)
+{
+ struct neigh_sysctl_table *t = kmalloc(sizeof(*t), GFP_KERNEL);
+ const char *dev_name_source = NULL;
+ char *dev_name = NULL;
+ int err = 0;
+
+ if (!t)
+ return -ENOBUFS;
+ memcpy(t, &neigh_sysctl_template, sizeof(*t));
+ t->neigh_vars[0].data = &p->mcast_probes;
+ t->neigh_vars[1].data = &p->ucast_probes;
+ t->neigh_vars[2].data = &p->app_probes;
+ t->neigh_vars[3].data = &p->retrans_time;
+ t->neigh_vars[4].data = &p->base_reachable_time;
+ t->neigh_vars[5].data = &p->delay_probe_time;
+ t->neigh_vars[6].data = &p->gc_staletime;
+ t->neigh_vars[7].data = &p->queue_len;
+ t->neigh_vars[8].data = &p->proxy_qlen;
+ t->neigh_vars[9].data = &p->anycast_delay;
+ t->neigh_vars[10].data = &p->proxy_delay;
+ t->neigh_vars[11].data = &p->locktime;
+
+ if (dev) {
+ dev_name_source = dev->name;
+ t->neigh_dev[0].ctl_name = dev->ifindex;
+ t->neigh_vars[12].procname = NULL;
+ t->neigh_vars[13].procname = NULL;
+ t->neigh_vars[14].procname = NULL;
+ t->neigh_vars[15].procname = NULL;
+ } else {
+ dev_name_source = t->neigh_dev[0].procname;
+ t->neigh_vars[12].data = (int *)(p + 1);
+ t->neigh_vars[13].data = (int *)(p + 1) + 1;
+ t->neigh_vars[14].data = (int *)(p + 1) + 2;
+ t->neigh_vars[15].data = (int *)(p + 1) + 3;
+ }
+
+ t->neigh_vars[16].data = &p->retrans_time;
+ t->neigh_vars[17].data = &p->base_reachable_time;
+
+ if (handler || strategy) {
+ /* RetransTime */
+ t->neigh_vars[3].proc_handler = handler;
+ t->neigh_vars[3].strategy = strategy;
+ t->neigh_vars[3].extra1 = dev;
+ /* ReachableTime */
+ t->neigh_vars[4].proc_handler = handler;
+ t->neigh_vars[4].strategy = strategy;
+ t->neigh_vars[4].extra1 = dev;
+ /* RetransTime (in milliseconds)*/
+ t->neigh_vars[16].proc_handler = handler;
+ t->neigh_vars[16].strategy = strategy;
+ t->neigh_vars[16].extra1 = dev;
+ /* ReachableTime (in milliseconds) */
+ t->neigh_vars[17].proc_handler = handler;
+ t->neigh_vars[17].strategy = strategy;
+ t->neigh_vars[17].extra1 = dev;
+ }
+
+ dev_name = net_sysctl_strdup(dev_name_source);
+ if (!dev_name) {
+ err = -ENOBUFS;
+ goto free;
+ }
+
+ t->neigh_dev[0].procname = dev_name;
+
+ t->neigh_neigh_dir[0].ctl_name = pdev_id;
+
+ t->neigh_proto_dir[0].procname = p_name;
+ t->neigh_proto_dir[0].ctl_name = p_id;
+
+ t->neigh_dev[0].child = t->neigh_vars;
+ t->neigh_neigh_dir[0].child = t->neigh_dev;
+ t->neigh_proto_dir[0].child = t->neigh_neigh_dir;
+ t->neigh_root_dir[0].child = t->neigh_proto_dir;
+
+ t->sysctl_header = register_sysctl_table(t->neigh_root_dir, 0);
+ if (!t->sysctl_header) {
+ err = -ENOBUFS;
+ goto free_procname;
+ }
+ p->sysctl_table = t;
+ return 0;
+
+ /* error path */
+ free_procname:
+ kfree(dev_name);
+ free:
+ kfree(t);
+
+ return err;
+}
+
+void neigh_sysctl_unregister(struct neigh_parms *p)
+{
+ if (p->sysctl_table) {
+ struct neigh_sysctl_table *t = p->sysctl_table;
+ p->sysctl_table = NULL;
+ unregister_sysctl_table(t->sysctl_header);
+ kfree(t->neigh_dev[0].procname);
+ kfree(t);
+ }
+}
+
+#endif /* CONFIG_SYSCTL */
+
+EXPORT_SYMBOL(__neigh_event_send);
+EXPORT_SYMBOL(neigh_add);
+EXPORT_SYMBOL(neigh_changeaddr);
+EXPORT_SYMBOL(neigh_compat_output);
+EXPORT_SYMBOL(neigh_connected_output);
+EXPORT_SYMBOL(neigh_create);
+EXPORT_SYMBOL(neigh_delete);
+EXPORT_SYMBOL(neigh_destroy);
+EXPORT_SYMBOL(neigh_dump_info);
+EXPORT_SYMBOL(neigh_event_ns);
+EXPORT_SYMBOL(neigh_ifdown);
+EXPORT_SYMBOL(neigh_lookup);
+EXPORT_SYMBOL(neigh_lookup_nodev);
+EXPORT_SYMBOL(neigh_parms_alloc);
+EXPORT_SYMBOL(neigh_parms_release);
+EXPORT_SYMBOL(neigh_rand_reach_time);
+EXPORT_SYMBOL(neigh_resolve_output);
+EXPORT_SYMBOL(neigh_table_clear);
+EXPORT_SYMBOL(neigh_table_init);
+EXPORT_SYMBOL(neigh_update);
+EXPORT_SYMBOL(neigh_update_hhs);
+EXPORT_SYMBOL(pneigh_enqueue);
+EXPORT_SYMBOL(pneigh_lookup);
+
+#ifdef CONFIG_ARPD
+EXPORT_SYMBOL(neigh_app_ns);
+#endif
+#ifdef CONFIG_SYSCTL
+EXPORT_SYMBOL(neigh_sysctl_register);
+EXPORT_SYMBOL(neigh_sysctl_unregister);
+#endif
generated by cgit v1.2.3 (git 2.25.1) at 2024-04-19 15:41:09 +0000