[SK_BUFF]: Introduce skb_set_network_header

For the cases where the network header is being set to a offset from skb->data.
Signed-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

include/linux/skbuff.h

@@ -970,6 +970,11 @@ static inline void skb_reset_network_header(struct sk_buff *skb)
 	skb->nh.raw = skb->data;
 }
 
+static inline void skb_set_network_header(struct sk_buff *skb, const int offset)
+{
+	skb->nh.raw = skb->data + offset;
+}
+
 static inline int skb_network_offset(const struct sk_buff *skb)
 {
 	return skb->nh.raw - skb->data;

net/ax25/ax25_out.c

@@ -148,7 +148,8 @@ void ax25_output(ax25_cb *ax25, int paclen, struct sk_buff *skb)
 
 			if (ka9qfrag == 1) {
 				skb_reserve(skbn, frontlen + 2);
-				skbn->nh.raw = skbn->data + skb_network_offset(skb);
+				skb_set_network_header(skbn,
+						      skb_network_offset(skb));
 				memcpy(skb_put(skbn, len), skb->data, len);
 				p = skb_push(skbn, 2);
 
@@ -161,7 +162,8 @@ void ax25_output(ax25_cb *ax25, int paclen, struct sk_buff *skb)
 				}
 			} else {
 				skb_reserve(skbn, frontlen + 1);
-				skbn->nh.raw = skbn->data + skb_network_offset(skb);
+				skb_set_network_header(skbn,
+						      skb_network_offset(skb));
 				memcpy(skb_put(skbn, len), skb->data, len);
 				p = skb_push(skbn, 1);
 				*p = AX25_P_TEXT;

net/ipv4/ip_output.c

@@ -928,9 +928,9 @@ int ip_append_data(struct sock *sk,
 			 *	Find where to start putting bytes.
 			 */
 			data = skb_put(skb, fraglen);
-			skb->nh.raw = data + exthdrlen;
+			skb_set_network_header(skb, exthdrlen);
+			skb->h.raw = skb->nh.raw + fragheaderlen;
 			data += fragheaderlen;
-			skb->h.raw = data + exthdrlen;
 
 			if (fraggap) {
 				skb->csum = skb_copy_and_csum_bits(

net/ipv4/tcp_input.c

@@ -3634,7 +3634,8 @@ tcp_collapse(struct sock *sk, struct sk_buff_head *list,
 			return;
 
 		skb_set_mac_header(nskb, skb_mac_header(skb) - skb->head);
-		nskb->nh.raw = nskb->data + (skb_network_header(skb) - skb->head);
+		skb_set_network_header(nskb,
+				       skb_network_header(skb) - skb->head);
 		nskb->h.raw = nskb->data + (skb->h.raw - skb->head);
 
 		skb_reserve(nskb, header);

net/ipv6/ip6_output.c

@@ -1206,9 +1206,9 @@ int ip6_append_data(struct sock *sk, int getfrag(void *from, char *to,
 			 *	Find where to start putting bytes
 			 */
 			data = skb_put(skb, fraglen);
-			skb->nh.raw = data + exthdrlen;
+			skb_set_network_header(skb, exthdrlen);
 			data += fragheaderlen;
-			skb->h.raw = data + exthdrlen;
+			skb->h.raw = skb->nh.raw + fragheaderlen;
 
 			if (fraggap) {
 				skb->csum = skb_copy_and_csum_bits(