bpf, net: add skb_mac_header_len helper
Add a small skb_mac_header_len() helper similarly as the
skb_network_header_len() we have and replace open coded
places in BPF's bpf_skb_change_proto() helper. Will also
be used in upcoming work.
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index d0b9f38..3d3ceaa 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -2206,6 +2206,11 @@ static inline int skb_mac_offset(const struct sk_buff *skb)
return skb_mac_header(skb) - skb->data;
}
+static inline u32 skb_mac_header_len(const struct sk_buff *skb)
+{
+ return skb->network_header - skb->mac_header;
+}
+
static inline int skb_mac_header_was_set(const struct sk_buff *skb)
{
return skb->mac_header != (typeof(skb->mac_header))~0U;