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-rw-r--r--include/net/neighbour.h47
1 files changed, 35 insertions, 12 deletions
diff --git a/include/net/neighbour.h b/include/net/neighbour.h
index 242879b..55590ab 100644
--- a/include/net/neighbour.h
+++ b/include/net/neighbour.h
@@ -91,26 +91,28 @@ struct neigh_statistics {
#define NEIGH_CACHE_STAT_INC(tbl, field) this_cpu_inc((tbl)->stats->field)
struct neighbour {
- struct neighbour *next;
+ struct neighbour __rcu *next;
struct neigh_table *tbl;
struct neigh_parms *parms;
- struct net_device *dev;
- unsigned long used;
unsigned long confirmed;
unsigned long updated;
__u8 flags;
__u8 nud_state;
__u8 type;
__u8 dead;
+ atomic_t refcnt;
+ struct sk_buff_head arp_queue;
+ struct timer_list timer;
+ unsigned long used;
atomic_t probes;
rwlock_t lock;
+ seqlock_t ha_lock;
unsigned char ha[ALIGN(MAX_ADDR_LEN, sizeof(unsigned long))];
struct hh_cache *hh;
- atomic_t refcnt;
int (*output)(struct sk_buff *skb);
- struct sk_buff_head arp_queue;
- struct timer_list timer;
const struct neigh_ops *ops;
+ struct rcu_head rcu;
+ struct net_device *dev;
u8 primary_key[0];
};
@@ -138,13 +140,22 @@ struct pneigh_entry {
* neighbour table manipulation
*/
+struct neigh_hash_table {
+ struct neighbour __rcu **hash_buckets;
+ unsigned int hash_mask;
+ __u32 hash_rnd;
+ struct rcu_head rcu;
+};
+
struct neigh_table {
struct neigh_table *next;
int family;
int entry_size;
int key_len;
- __u32 (*hash)(const void *pkey, const struct net_device *);
+ __u32 (*hash)(const void *pkey,
+ const struct net_device *dev,
+ __u32 hash_rnd);
int (*constructor)(struct neighbour *);
int (*pconstructor)(struct pneigh_entry *);
void (*pdestructor)(struct pneigh_entry *);
@@ -163,11 +174,9 @@ struct neigh_table {
atomic_t entries;
rwlock_t lock;
unsigned long last_rand;
- struct kmem_cache *kmem_cachep;
+ struct kmem_cache *kmem_cachep;
struct neigh_statistics __percpu *stats;
- struct neighbour **hash_buckets;
- unsigned int hash_mask;
- __u32 hash_rnd;
+ struct neigh_hash_table __rcu *nht;
struct pneigh_entry **phash_buckets;
};
@@ -237,6 +246,7 @@ extern void pneigh_for_each(struct neigh_table *tbl, void (*cb)(struct pneigh_en
struct neigh_seq_state {
struct seq_net_private p;
struct neigh_table *tbl;
+ struct neigh_hash_table *nht;
void *(*neigh_sub_iter)(struct neigh_seq_state *state,
struct neighbour *n, loff_t *pos);
unsigned int bucket;
@@ -293,7 +303,10 @@ static inline void neigh_confirm(struct neighbour *neigh)
static inline int neigh_event_send(struct neighbour *neigh, struct sk_buff *skb)
{
- neigh->used = jiffies;
+ unsigned long now = ACCESS_ONCE(jiffies);
+
+ if (neigh->used != now)
+ neigh->used = now;
if (!(neigh->nud_state&(NUD_CONNECTED|NUD_DELAY|NUD_PROBE)))
return __neigh_event_send(neigh, skb);
return 0;
@@ -364,4 +377,14 @@ struct neighbour_cb {
#define NEIGH_CB(skb) ((struct neighbour_cb *)(skb)->cb)
+static inline void neigh_ha_snapshot(char *dst, const struct neighbour *n,
+ const struct net_device *dev)
+{
+ unsigned int seq;
+
+ do {
+ seq = read_seqbegin(&n->ha_lock);
+ memcpy(dst, n->ha, dev->addr_len);
+ } while (read_seqretry(&n->ha_lock, seq));
+}
#endif