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net: Store ipv4/ipv6 COW'd metrics in inetpeer cache.

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Please note that the IPSEC dst entry metrics keep using
the generic metrics COW'ing mechanism using kmalloc/kfree.

This gives the IPSEC routes an opportunity to use metrics
which are unique to their encapsulated paths.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller
2011-01-27 14:58:42 -08:00
parent 1397e171f1
commit 065825402c
2 changed files with 42 additions and 9 deletions
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18
net/ipv4/route.c
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@@ -154,25 +154,30 @@ static void ipv4_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
static u32 *ipv4_cow_metrics(struct dst_entry *dst, unsigned long old)
{
u32 *p = kmalloc(sizeof(u32) * RTAX_MAX, GFP_ATOMIC);
struct rtable *rt = (struct rtable *) dst;
struct inet_peer *peer;
u32 *p = NULL;
if (p) {
if (!rt->peer)
rt_bind_peer(rt, 1);
peer = rt->peer;
if (peer) {
u32 *old_p = __DST_METRICS_PTR(old);
unsigned long prev, new;
memcpy(p, old_p, sizeof(u32) * RTAX_MAX);
p = peer->metrics;
if (inet_metrics_new(peer))
memcpy(p, old_p, sizeof(u32) * RTAX_MAX);
new = (unsigned long) p;
prev = cmpxchg(&dst->_metrics, old, new);
if (prev != old) {
kfree(p);
p = __DST_METRICS_PTR(prev);
if (prev & DST_METRICS_READ_ONLY)
p = NULL;
} else {
struct rtable *rt = (struct rtable *) dst;
if (rt->fi) {
fib_info_put(rt->fi);
rt->fi = NULL;
@@ -1753,7 +1758,6 @@ static void ipv4_dst_destroy(struct dst_entry *dst)
struct rtable *rt = (struct rtable *) dst;
struct inet_peer *peer = rt->peer;
dst_destroy_metrics_generic(dst);
if (rt->fi) {
fib_info_put(rt->fi);
rt->fi = NULL;