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inetpeer: Introduce inet_peer_address_t.

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Currently only the v4 aspect is used, but this will change.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2010-11-30 11:53:55 -08:00
parent 98158f5a85
commit 582a72da9a
3 changed files with 18 additions and 10 deletions
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10
include/net/inetpeer.h
View File

@ -13,10 +13,18 @@
#include <linux/spinlock.h>
#include <asm/atomic.h>
typedef struct {
union {
__be32 a4;
__be32 a6[4];
};
__u16 family;
} inet_peer_address_t;
struct inet_peer {
/* group together avl_left,avl_right,v4daddr to speedup lookups */
struct inet_peer __rcu *avl_left, *avl_right;
__be32 v4daddr; /* peer's address */
inet_peer_address_t daddr;
__u32 avl_height;
struct list_head unused;
__u32 dtime; /* the time of last use of not

16
net/ipv4/inetpeer.c
View File

@ -63,7 +63,7 @@
* refcnt: atomically against modifications on other CPU;
* usually under some other lock to prevent node disappearing
* dtime: unused node list lock
* v4daddr: unchangeable
* daddr: unchangeable
* ip_id_count: atomic value (no lock needed)
*/
@ -165,9 +165,9 @@ static void unlink_from_unused(struct inet_peer *p)
for (u = rcu_dereference_protected(_base->root, \
lockdep_is_held(&_base->lock)); \
u != peer_avl_empty; ) { \
if (_daddr == u->v4daddr) \
if (_daddr == u->daddr.a4) \
break; \
if ((__force __u32)_daddr < (__force __u32)u->v4daddr) \
if ((__force __u32)_daddr < (__force __u32)u->daddr.a4) \
v = &u->avl_left; \
else \
v = &u->avl_right; \
@ -191,7 +191,7 @@ static struct inet_peer *lookup_rcu_bh(__be32 daddr, struct inet_peer_base *base
int count = 0;
while (u != peer_avl_empty) {
if (daddr == u->v4daddr) {
if (daddr == u->daddr.a4) {
/* Before taking a reference, check if this entry was
* deleted, unlink_from_pool() sets refcnt=-1 to make
* distinction between an unused entry (refcnt=0) and
@ -201,7 +201,7 @@ static struct inet_peer *lookup_rcu_bh(__be32 daddr, struct inet_peer_base *base
u = NULL;
return u;
}
if ((__force __u32)daddr < (__force __u32)u->v4daddr)
if ((__force __u32)daddr < (__force __u32)u->daddr.a4)
u = rcu_dereference_bh(u->avl_left);
else
u = rcu_dereference_bh(u->avl_right);
@ -354,7 +354,7 @@ static void unlink_from_pool(struct inet_peer *p, struct inet_peer_base *base)
if (atomic_cmpxchg(&p->refcnt, 1, -1) == 1) {
struct inet_peer __rcu **stack[PEER_MAXDEPTH];
struct inet_peer __rcu ***stackptr, ***delp;
if (lookup(p->v4daddr, stack, base) != p)
if (lookup(p->daddr.a4, stack, base) != p)
BUG();
delp = stackptr - 1; /* *delp[0] == p */
if (p->avl_left == peer_avl_empty_rcu) {
@ -367,7 +367,7 @@ static void unlink_from_pool(struct inet_peer *p, struct inet_peer_base *base)
BUG_ON(rcu_dereference_protected(*stackptr[-1],
lockdep_is_held(&base->lock)) != t);
**--stackptr = t->avl_left;
/* t is removed, t->v4daddr > x->v4daddr for any
/* t is removed, t->daddr > x->daddr for any
* x in p->avl_left subtree.
* Put t in the old place of p. */
RCU_INIT_POINTER(*delp[0], t);
@ -479,7 +479,7 @@ struct inet_peer *inet_getpeer(__be32 daddr, int create)
}
p = create ? kmem_cache_alloc(peer_cachep, GFP_ATOMIC) : NULL;
if (p) {
p->v4daddr = daddr;
p->daddr.a4 = daddr;
atomic_set(&p->refcnt, 1);
atomic_set(&p->rid, 0);
atomic_set(&p->ip_id_count, secure_ip_id(daddr));

2
net/ipv4/tcp_ipv4.c
View File

@ -1347,7 +1347,7 @@ int tcp_v4_conn_request(struct sock *sk, struct sk_buff *skb)
tcp_death_row.sysctl_tw_recycle &&
(dst = inet_csk_route_req(sk, req)) != NULL &&
(peer = rt_get_peer((struct rtable *)dst)) != NULL &&
peer->v4daddr == saddr) {
peer->daddr.a4 == saddr) {
inet_peer_refcheck(peer);
if ((u32)get_seconds() - peer->tcp_ts_stamp < TCP_PAWS_MSL &&
(s32)(peer->tcp_ts - req->ts_recent) >