Re: [PATCH] IPSec: IPv6 UDP policy checking

["David S. Miller" <davem@xxxxxxxxxx>]

   From: Tom Lendacky <toml@xxxxxxxxxx>
   Date: 24 Mar 2003 16:31:29 -0600
   
   After getting racoon to be able to listen on an IPv6 address, it wasn't
   receiving any of the IKE messages being sent to it.  The following
   patch fixes the problem and is consistent with when and how the IPv4
   UDP code invokes xfrm_policy_check.
   
   Please review to be sure this is acceptable.
   
I have applied this patch.  Thanks for finding this bug Tom.

Yoshfuji, please note of this patch below from Tom which I have added
to my tree.
   
--- linux-2.5.65-orig/net/ipv6/udp.c    2003-03-17 15:44:41.000000000 -0600
+++ linux-2.5.65/net/ipv6/udp.c 2003-03-24 16:28:02.000000000 -0600
@@ -652,9 +652,6 @@
        if (!pskb_may_pull(skb, sizeof(struct udphdr)))
                goto short_packet;
 
-       if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
-                goto discard;
-
        saddr = &skb->nh.ipv6h->saddr;
        daddr = &skb->nh.ipv6h->daddr;
        uh = skb->h.uh;
@@ -712,6 +709,9 @@
        sk = udp_v6_lookup(saddr, uh->source, daddr, uh->dest, dev->ifindex);
 
        if (sk == NULL) {
+               if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
+                       goto discard;
+
                if (skb->ip_summed != CHECKSUM_UNNECESSARY &&
                    (unsigned short)csum_fold(skb_checksum(skb, 0, skb->len, 
skb->csum)))
                        goto discard;