net: Add skb_headers_offset_update helper function.

This function will be used in next VXLAN_GSO patch. This patch does
not change any functionality.

Signed-off-by: Pravin B Shelar <pshelar@nicira.com>
Acked-by: Stephen Hemminger <stephen@networkplumber.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 14 insertions, 20 deletions

diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index 0a48ae20c903..0278c7f787bf 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -867,6 +867,17 @@ struct sk_buff *skb_clone(struct sk_buff *skb, gfp_t gfp_mask)
 }
 EXPORT_SYMBOL(skb_clone);
 
+static void skb_headers_offset_update(struct sk_buff *skb, int off)
+{
+        /* {transport,network,mac}_header and tail are relative to skb->head */
+        skb->transport_header += off;
+        skb->network_header   += off;
+        if (skb_mac_header_was_set(skb))
+                skb->mac_header += off;
+        skb->inner_transport_header += off;
+        skb->inner_network_header += off;
+}
+
 static void copy_skb_header(struct sk_buff *new, const struct sk_buff *old)
 {
 #ifndef NET_SKBUFF_DATA_USES_OFFSET
@@ -879,13 +890,7 @@ static void copy_skb_header(struct sk_buff *new, const struct sk_buff *old)
         __copy_skb_header(new, old);
 
 #ifndef NET_SKBUFF_DATA_USES_OFFSET
-        /* {transport,network,mac}_header are relative to skb->head */
-        new->transport_header += offset;
-        new->network_header   += offset;
-        if (skb_mac_header_was_set(new))
-                new->mac_header       += offset;
-        new->inner_transport_header += offset;
-        new->inner_network_header   += offset;
+        skb_headers_offset_update(new, offset);
 #endif
         skb_shinfo(new)->gso_size = skb_shinfo(old)->gso_size;
         skb_shinfo(new)->gso_segs = skb_shinfo(old)->gso_segs;
@@ -1077,14 +1082,8 @@ int pskb_expand_head(struct sk_buff *skb, int nhead, int ntail,
 #else
         skb->end      = skb->head + size;
 #endif
-        /* {transport,network,mac}_header and tail are relative to skb->head */
         skb->tail             += off;
-        skb->transport_header += off;
-        skb->network_header   += off;
-        if (skb_mac_header_was_set(skb))
-                skb->mac_header += off;
-        skb->inner_transport_header += off;
-        skb->inner_network_header += off;
+        skb_headers_offset_update(skb, off);
         /* Only adjust this if it actually is csum_start rather than csum */
         if (skb->ip_summed == CHECKSUM_PARTIAL)
                 skb->csum_start += nhead;
@@ -1180,12 +1179,7 @@ struct sk_buff *skb_copy_expand(const struct sk_buff *skb,
         if (n->ip_summed == CHECKSUM_PARTIAL)
                 n->csum_start += off;
 #ifdef NET_SKBUFF_DATA_USES_OFFSET
-        n->transport_header += off;
-        n->network_header   += off;
-        if (skb_mac_header_was_set(skb))
-                n->mac_header += off;
-        n->inner_transport_header += off;
-        n->inner_network_header    += off;
+        skb_headers_offset_update(n, off);
 #endif
 
         return n;