netns xfrm: AH/ESP in netns!

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ipv4/ah4.c b/net/ipv4/ah4.c
index 750426b..e878e49 100644
--- a/net/ipv4/ah4.c
+++ b/net/ipv4/ah4.c
@@ -201,6 +201,7 @@
 
 static void ah4_err(struct sk_buff *skb, u32 info)
 {
+	struct net *net = dev_net(skb->dev);
 	struct iphdr *iph = (struct iphdr *)skb->data;
 	struct ip_auth_hdr *ah = (struct ip_auth_hdr *)(skb->data+(iph->ihl<<2));
 	struct xfrm_state *x;
@@ -209,7 +210,7 @@
 	    icmp_hdr(skb)->code != ICMP_FRAG_NEEDED)
 		return;
 
-	x = xfrm_state_lookup(&init_net, (xfrm_address_t *)&iph->daddr, ah->spi, IPPROTO_AH, AF_INET);
+	x = xfrm_state_lookup(net, (xfrm_address_t *)&iph->daddr, ah->spi, IPPROTO_AH, AF_INET);
 	if (!x)
 		return;
 	printk(KERN_DEBUG "pmtu discovery on SA AH/%08x/%08x\n",
@@ -314,6 +315,7 @@
 	.handler	=	xfrm4_rcv,
 	.err_handler	=	ah4_err,
 	.no_policy	=	1,
+	.netns_ok	=	1,
 };
 
 static int __init ah4_init(void)