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Diffstat (limited to 'net/ipv4/tunnel4.c')
-rw-r--r--net/ipv4/tunnel4.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/net/ipv4/tunnel4.c b/net/ipv4/tunnel4.c
index 0d7d386..8d30c48 100644
--- a/net/ipv4/tunnel4.c
+++ b/net/ipv4/tunnel4.c
@@ -8,6 +8,8 @@
#include <linux/mutex.h>
#include <linux/netdevice.h>
#include <linux/skbuff.h>
+#include <net/icmp.h>
+#include <net/ip.h>
#include <net/protocol.h>
#include <net/xfrm.h>
@@ -70,10 +72,16 @@ static int tunnel4_rcv(struct sk_buff *skb)
{
struct xfrm_tunnel *handler;
+ if (!pskb_may_pull(skb, sizeof(struct iphdr)))
+ goto drop;
+
for (handler = tunnel4_handlers; handler; handler = handler->next)
if (!handler->handler(skb))
return 0;
+ icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0);
+
+drop:
kfree_skb(skb);
return 0;
}
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