X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=net%2Fipv4%2Fxfrm4_tunnel.c;h=0999f9e956bb7dc246cb0aa6c9cb6760bd2e2480;hb=5d0dd51ddb446e7c058023420f5b7d4404501980;hp=0d1a0b0c7901265a7b76823365435aed1b6bd286;hpb=a91482bdcc2e0f6035702e46f1b99043a0893346;p=linux-2.6.git

diff --git a/net/ipv4/xfrm4_tunnel.c b/net/ipv4/xfrm4_tunnel.c
index 0d1a0b0c7..0999f9e95 100644
--- a/net/ipv4/xfrm4_tunnel.c
+++ b/net/ipv4/xfrm4_tunnel.c
@@ -6,7 +6,32 @@
 #include <linux/skbuff.h>
 #include <net/xfrm.h>
 #include <net/ip.h>
-#include <net/protocol.h>
+#include <net/icmp.h>
+#include <net/inet_ecn.h>
+
+int xfrm4_tunnel_check_size(struct sk_buff *skb)
+{
+	int mtu, ret = 0;
+	struct dst_entry *dst;
+	struct iphdr *iph = skb->nh.iph;
+
+	if (IPCB(skb)->flags & IPSKB_XFRM_TUNNEL_SIZE)
+		goto out;
+
+	IPCB(skb)->flags |= IPSKB_XFRM_TUNNEL_SIZE;
+	
+	if (!(iph->frag_off & htons(IP_DF)))
+		goto out;
+
+	dst = skb->dst;
+	mtu = dst_pmtu(dst) - dst->header_len - dst->trailer_len;
+	if (skb->len > mtu) {
+		icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu));
+		ret = -EMSGSIZE;
+	}
+out:
+	return ret;
+}
 
 static int ipip_output(struct sk_buff **pskb)
 {