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Date: Tue, 30 Nov 2010 13:22:04 -0800 (PST)
From: David Miller <davem@...emloft.net>
To: netdev@...r.kernel.org
Subject: [PATCH 4/8] inetpeer: Abstract address comparisons.
Now v4 and v6 addresses will both work properly.
Signed-off-by: David S. Miller <davem@...emloft.net>
---
net/ipv4/inetpeer.c | 35 +++++++++++++++++++++++++++--------
1 files changed, 27 insertions(+), 8 deletions(-)
diff --git a/net/ipv4/inetpeer.c b/net/ipv4/inetpeer.c
index 9aa76b8..c96dc51 100644
--- a/net/ipv4/inetpeer.c
+++ b/net/ipv4/inetpeer.c
@@ -152,6 +152,22 @@ static void unlink_from_unused(struct inet_peer *p)
}
}
+static int addr_compare(const inet_peer_address_t *a,
+ const inet_peer_address_t *b)
+{
+ int i, n = (a->family == AF_INET ? 1 : 4);
+
+ for (i = 0; i < n; i++) {
+ if (a->a6[i] == b->a6[i])
+ continue;
+ if (a->a6[i] < b->a6[i])
+ return -1;
+ return 1;
+ }
+
+ return 0;
+}
+
/*
* Called with local BH disabled and the pool lock held.
*/
@@ -165,9 +181,10 @@ 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->daddr.a4) \
+ int cmp = addr_compare(_daddr, &u->daddr); \
+ if (cmp == 0) \
break; \
- if ((__force __u32)_daddr < (__force __u32)u->daddr.a4) \
+ if (cmp == -1) \
v = &u->avl_left; \
else \
v = &u->avl_right; \
@@ -185,13 +202,15 @@ static void unlink_from_unused(struct inet_peer *p)
* But every pointer we follow is guaranteed to be valid thanks to RCU.
* We exit from this function if number of links exceeds PEER_MAXDEPTH
*/
-static struct inet_peer *lookup_rcu_bh(__be32 daddr, struct inet_peer_base *base)
+static struct inet_peer *lookup_rcu_bh(const inet_peer_address_t *daddr,
+ struct inet_peer_base *base)
{
struct inet_peer *u = rcu_dereference_bh(base->root);
int count = 0;
while (u != peer_avl_empty) {
- if (daddr == u->daddr.a4) {
+ int cmp = addr_compare(daddr, &u->daddr);
+ if (cmp == 0) {
/* 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 +220,7 @@ 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->daddr.a4)
+ if (cmp == -1)
u = rcu_dereference_bh(u->avl_left);
else
u = rcu_dereference_bh(u->avl_right);
@@ -354,7 +373,7 @@ 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->daddr.a4, stack, base) != p)
+ if (lookup(&p->daddr, stack, base) != p)
BUG();
delp = stackptr - 1; /* *delp[0] == p */
if (p->avl_left == peer_avl_empty_rcu) {
@@ -454,7 +473,7 @@ struct inet_peer *inet_getpeer(inet_peer_address_t *daddr, int create)
* Because of a concurrent writer, we might not find an existing entry.
*/
rcu_read_lock_bh();
- p = lookup_rcu_bh(daddr->a4, base);
+ p = lookup_rcu_bh(daddr, base);
rcu_read_unlock_bh();
if (p) {
@@ -469,7 +488,7 @@ struct inet_peer *inet_getpeer(inet_peer_address_t *daddr, int create)
* At least, nodes should be hot in our cache.
*/
spin_lock_bh(&base->lock);
- p = lookup(daddr->a4, stack, base);
+ p = lookup(daddr, stack, base);
if (p != peer_avl_empty) {
atomic_inc(&p->refcnt);
spin_unlock_bh(&base->lock);
--
1.7.3.2
--
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