[IPSEC]: Move xfrm[46]_tunnel_check_size into xfrm[46]_output.c

This patch moves xfrm[46]_tunnel_check_size() into xfrm[46]_output.c
where it can be made static since it's only used there.

While moving the icmp.h inclusions over I also discovered that the
tunnel files are missing an inclusion of net/protocol.h.  So I've
added them as well.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@redhat.com>

include/net/xfrm.h

@@ -821,11 +821,9 @@ extern int xfrm4_rcv(struct sk_buff *skb);
 extern int xfrm4_output(struct sk_buff **pskb);
 extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler);
 extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler);
-extern int xfrm4_tunnel_check_size(struct sk_buff *skb);
 extern int xfrm6_rcv(struct sk_buff **pskb, unsigned int *nhoffp);
 extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler);
 extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler);
-extern int xfrm6_tunnel_check_size(struct sk_buff *skb);
 extern u32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr);
 extern void xfrm6_tunnel_free_spi(xfrm_address_t *saddr);
 extern u32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr);

net/ipv4/xfrm4_output.c

@@ -13,6 +13,7 @@
 #include <net/inet_ecn.h>
 #include <net/ip.h>
 #include <net/xfrm.h>
+#include <net/icmp.h>
 
 /* Add encapsulation header.
  *
@@ -67,6 +68,30 @@ static void xfrm4_encap(struct sk_buff *skb)
 	memset(&(IPCB(skb)->opt), 0, sizeof(struct ip_options));
 }
 
+static 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;
+}
+
 int xfrm4_output(struct sk_buff **pskb)
 {
 	struct sk_buff *skb = *pskb;

net/ipv4/xfrm4_tunnel.c

@@ -6,31 +6,7 @@
 #include <linux/skbuff.h>
 #include <net/xfrm.h>
 #include <net/ip.h>
-#include <net/icmp.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;
-}
+#include <net/protocol.h>
 
 static int ipip_output(struct sk_buff **pskb)
 {

net/ipv6/xfrm6_output.c

@@ -11,6 +11,7 @@
 
 #include <linux/skbuff.h>
 #include <linux/spinlock.h>
+#include <linux/icmpv6.h>
 #include <net/inet_ecn.h>
 #include <net/ipv6.h>
 #include <net/xfrm.h>
@@ -68,6 +69,23 @@ static void xfrm6_encap(struct sk_buff *skb)
 	ipv6_addr_copy(&top_iph->daddr, (struct in6_addr *)&x->id.daddr);
 }
 
+static int xfrm6_tunnel_check_size(struct sk_buff *skb)
+{
+	int mtu, ret = 0;
+	struct dst_entry *dst = skb->dst;
+
+	mtu = dst_pmtu(dst) - sizeof(struct ipv6hdr);
+	if (mtu < IPV6_MIN_MTU)
+		mtu = IPV6_MIN_MTU;
+
+	if (skb->len > mtu) {
+		icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, skb->dev);
+		ret = -EMSGSIZE;
+	}
+
+	return ret;
+}
+
 int xfrm6_output(struct sk_buff **pskb)
 {
 	struct sk_buff *skb = *pskb;

net/ipv6/xfrm6_tunnel.c

@@ -27,8 +27,8 @@
 #include <linux/list.h>
 #include <net/ip.h>
 #include <net/xfrm.h>
-#include <net/icmp.h>
 #include <net/ipv6.h>
+#include <net/protocol.h>
 #include <linux/ipv6.h>
 #include <linux/icmpv6.h>
 
@@ -343,25 +343,6 @@ void xfrm6_tunnel_free_spi(xfrm_address_t *saddr)
 
 EXPORT_SYMBOL(xfrm6_tunnel_free_spi);
 
-int xfrm6_tunnel_check_size(struct sk_buff *skb)
-{
-	int mtu, ret = 0;
-	struct dst_entry *dst = skb->dst;
-
-	mtu = dst_pmtu(dst) - sizeof(struct ipv6hdr);
-	if (mtu < IPV6_MIN_MTU)
-		mtu = IPV6_MIN_MTU;
-
-	if (skb->len > mtu) {
-		icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, skb->dev);
-		ret = -EMSGSIZE;
-	}
-
-	return ret;
-}
-
-EXPORT_SYMBOL(xfrm6_tunnel_check_size);
-
 static int xfrm6_tunnel_output(struct sk_buff **pskb)
 {
 	struct sk_buff *skb = *pskb;

net/xfrm/xfrm_export.c

@@ -35,7 +35,6 @@ EXPORT_SYMBOL(xfrm_parse_spi);
 EXPORT_SYMBOL(xfrm4_rcv);
 EXPORT_SYMBOL(xfrm4_tunnel_register);
 EXPORT_SYMBOL(xfrm4_tunnel_deregister);
-EXPORT_SYMBOL(xfrm4_tunnel_check_size);
 EXPORT_SYMBOL(xfrm_register_type);
 EXPORT_SYMBOL(xfrm_unregister_type);
 EXPORT_SYMBOL(xfrm_get_type);