kvm tools: Add helper to return start address of TCP payload

uip_tcp_payload() returns start address of TCP payload in a TCP package.

Signed-off-by: Asias He <asias.hejun@gmail.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>

diff --git a/tools/kvm/include/kvm/uip.h b/tools/kvm/include/kvm/uip.h
index 2ac48d7eb6f347f6f4150bdc07cf909089a13c28..a3fd1b071a876d9bac08aab345089bd66930a45d 100644 (file)
--- a/tools/kvm/include/kvm/uip.h
+++ b/tools/kvm/include/kvm/uip.h
@@ -222,6 +222,11 @@ static inline u16 uip_tcp_payloadlen(struct uip_tcp *tcp)
        return uip_tcp_len(tcp) - uip_tcp_hdrlen(tcp);
 }
 
+static inline u8 *uip_tcp_payload(struct uip_tcp *tcp)
+{
+       return (u8 *)&tcp->sport + uip_tcp_hdrlen(tcp);
+}
+
 static inline u16 uip_eth_hdrlen(struct uip_eth *eth)
 {
        return sizeof(*eth);