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Date: Thu, 27 Jan 2011 15:01:54 -0800 (PST)
From: David Miller <davem@...emloft.net>
To: netdev@...r.kernel.org
Subject: [PATCH 3/3] net: Store ipv4/ipv6 COW'd metrics in inetpeer cache.
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@...emloft.net>
---
net/ipv4/route.c | 18 +++++++++++-------
net/ipv6/route.c | 33 +++++++++++++++++++++++++++++++--
2 files changed, 42 insertions(+), 9 deletions(-)
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 980030d4..68cee35 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -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 (!rt->peer)
+ rt_bind_peer(rt, 1);
- if (p) {
+ 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;
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 691798c..72609f1 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -97,6 +97,36 @@ static struct rt6_info *rt6_get_route_info(struct net *net,
struct in6_addr *gwaddr, int ifindex);
#endif
+static u32 *ipv6_cow_metrics(struct dst_entry *dst, unsigned long old)
+{
+ struct rt6_info *rt = (struct rt6_info *) dst;
+ struct inet_peer *peer;
+ u32 *p = NULL;
+
+ if (!rt->rt6i_peer)
+ rt6_bind_peer(rt, 1);
+
+ peer = rt->rt6i_peer;
+ if (peer) {
+ u32 *old_p = __DST_METRICS_PTR(old);
+ unsigned long prev, new;
+
+ 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) {
+ p = __DST_METRICS_PTR(prev);
+ if (prev & DST_METRICS_READ_ONLY)
+ p = NULL;
+ }
+ }
+ return p;
+}
+
static struct dst_ops ip6_dst_ops_template = {
.family = AF_INET6,
.protocol = cpu_to_be16(ETH_P_IPV6),
@@ -105,7 +135,7 @@ static struct dst_ops ip6_dst_ops_template = {
.check = ip6_dst_check,
.default_advmss = ip6_default_advmss,
.default_mtu = ip6_default_mtu,
- .cow_metrics = dst_cow_metrics_generic,
+ .cow_metrics = ipv6_cow_metrics,
.destroy = ip6_dst_destroy,
.ifdown = ip6_dst_ifdown,
.negative_advice = ip6_negative_advice,
@@ -198,7 +228,6 @@ static void ip6_dst_destroy(struct dst_entry *dst)
rt->rt6i_idev = NULL;
in6_dev_put(idev);
}
- dst_destroy_metrics_generic(dst);
if (peer) {
rt->rt6i_peer = NULL;
inet_putpeer(peer);
--
1.7.3.4
--
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