kvm tools: Add helpers to return TCP {header, total, payload} length

This patch adds three helpers uip_tcp_hdrlen(), uip_tcp_len(),
uip_tcp_payloadlen() to return TCP header length, TCP totoal
length, and tcp payload length.

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 a772fdfa00aa38362fb250134aabe0a957e21ebb..2ac48d7eb6f347f6f4150bdc07cf909089a13c28 100644 (file)
--- a/tools/kvm/include/kvm/uip.h
+++ b/tools/kvm/include/kvm/uip.h
@@ -203,6 +203,25 @@ static inline u16 uip_udp_len(struct uip_udp *udp)
        return ntohs(udp->len);
 }
 
+static inline u16 uip_tcp_hdrlen(struct uip_tcp *tcp)
+{
+       return (tcp->off >> 4) * 4;
+}
+
+static inline u16 uip_tcp_len(struct uip_tcp *tcp)
+{
+       struct uip_ip *ip;
+
+       ip = &tcp->ip;
+
+       return uip_ip_len(ip) - uip_ip_hdrlen(ip);
+}
+
+static inline u16 uip_tcp_payloadlen(struct uip_tcp *tcp)
+{
+       return uip_tcp_len(tcp) - uip_tcp_hdrlen(tcp);
+}
+
 static inline u16 uip_eth_hdrlen(struct uip_eth *eth)
 {
        return sizeof(*eth);