[ 03/79] ipv6: only apply anti-spoofing checks to not-pointopoint tunnels

[Greg Kroah-Hartman]

3.10-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Hannes Frederic Sowa <hannes@xxxxxxxxxxxxxxxxxxx>

[ Upstream commit 5c29fb12e8fb8a8105ea048cb160fd79a85a52bb ]

Because of commit 218774dc341f219bfcf940304a081b121a0e8099 ("ipv6: add
anti-spoofing checks for 6to4 and 6rd") the sit driver dropped packets
for 2002::/16 destinations and sources even when configured to work as a
tunnel with fixed endpoint. We may only apply the 6rd/6to4 anti-spoofing
checks if the device is not in pointopoint mode.

This was an oversight from me in the above commit, sorry.  Thanks to
Roman Mamedov for reporting this!

Reported-by: Roman Mamedov <rm@xxxxxxxxxx>
Cc: David Miller <davem@xxxxxxxxxxxxx>
Cc: YOSHIFUJI Hideaki <yoshfuji@xxxxxxxxxxxxxx>
Signed-off-by: Hannes Frederic Sowa <hannes@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 net/ipv6/sit.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/net/ipv6/sit.c
+++ b/net/ipv6/sit.c
@@ -589,7 +589,7 @@ static int ipip6_rcv(struct sk_buff *skb
 				tunnel->dev->stats.rx_errors++;
 				goto out;
 			}
-		} else {
+		} else if (!(tunnel->dev->flags&IFF_POINTOPOINT)) {
 			if (is_spoofed_6rd(tunnel, iph->saddr,
 					   &ipv6_hdr(skb)->saddr) ||
 			    is_spoofed_6rd(tunnel, iph->daddr,


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