kvm tools: Add helper to allocate and get TCP initial sequence number

Guest's initial sequence number can be found in the SYN package that
guest send to us to intialize a TCP session.

Remote server's initial sequence number is faked. RFC 793 specifies
that the ISN should be viewed as a 32-bit counter that increments
by one every 4 microseconds. For simplicity's sake, current
implementation in uip just returns a constant.

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 558568062dcb2e9858c77af5b91f0f8ebee50fd4..46cec2096d1a2d6d90cbd05d67c80a263dee8a51 100644 (file)
--- a/tools/kvm/include/kvm/uip.h
+++ b/tools/kvm/include/kvm/uip.h
@@ -244,6 +244,19 @@ static inline bool uip_tcp_is_fin(struct uip_tcp *tcp)
        return (tcp->flg & UIP_TCP_FLAG_FIN) != 0;
 }
 
+static inline u32 uip_tcp_isn(struct uip_tcp *tcp)
+{
+       return ntohl(tcp->seq);
+}
+
+static inline u32 uip_tcp_isn_alloc(void)
+{
+       /*
+        * FIXME: should increase every 4ms
+        */
+       return 10000000;
+}
+
 static inline u16 uip_eth_hdrlen(struct uip_eth *eth)
 {
        return sizeof(*eth);