net: move make_writable helper into common code
note that skb_make_writable already exists in net/netfilter/core.c
but does something slightly different.
Suggested-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: Jiri Pirko <jiri@resnulli.us>
Acked-by: Pravin B Shelar <pshelar@nicira.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 73c370e..e045516 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -2678,6 +2678,7 @@
unsigned int skb_gso_transport_seglen(const struct sk_buff *skb);
struct sk_buff *skb_segment(struct sk_buff *skb, netdev_features_t features);
struct sk_buff *skb_vlan_untag(struct sk_buff *skb);
+int skb_ensure_writable(struct sk_buff *skb, int write_len);
struct skb_checksum_ops {
__wsum (*update)(const void *mem, int len, __wsum wsum);