--- qemu/slirp/tcpip.h	2018/04/24 16:37:52	1.1.1.1
+++ qemu/slirp/tcpip.h	2018/04/24 16:54:43	1.1.1.2
@@ -10,11 +10,7 @@
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- *    must display the following acknowledgement:
- *	This product includes software developed by the University of
- *	California, Berkeley and its contributors.
- * 4. Neither the name of the University nor the names of its contributors
+ * 3. Neither the name of the University nor the names of its contributors
  *    may be used to endorse or promote products derived from this software
  *    without specific prior written permission.
  *
@@ -44,8 +40,7 @@ struct tcpiphdr {
 	struct 	ipovly ti_i;		/* overlaid ip structure */
 	struct	tcphdr ti_t;		/* tcp header */
 };
-#define	ti_next		ti_i.ih_next
-#define	ti_prev		ti_i.ih_prev
+#define	ti_mbuf		ti_i.ih_mbuf.mptr
 #define	ti_x1		ti_i.ih_x1
 #define	ti_pr		ti_i.ih_pr
 #define	ti_len		ti_i.ih_len
@@ -62,6 +57,14 @@ struct tcpiphdr {
 #define	ti_sum		ti_t.th_sum
 #define	ti_urp		ti_t.th_urp
 
+#define tcpiphdr2qlink(T) ((struct qlink*)(((char*)(T)) - sizeof(struct qlink)))
+#define qlink2tcpiphdr(Q) ((struct tcpiphdr*)(((char*)(Q)) + sizeof(struct qlink)))
+#define tcpiphdr_next(T) qlink2tcpiphdr(tcpiphdr2qlink(T)->next)
+#define tcpiphdr_prev(T) qlink2tcpiphdr(tcpiphdr2qlink(T)->prev)
+#define tcpfrag_list_first(T) qlink2tcpiphdr((T)->seg_next)
+#define tcpfrag_list_end(F, T) (tcpiphdr2qlink(F) == (struct qlink*)(T))
+#define tcpfrag_list_empty(T) ((T)->seg_next == (struct tcpiphdr*)(T))
+
 /*
  * Just a clean way to get to the first byte
  * of the packet