patch-2.1.50 linux/include/net/tcp.h

• Lines: 23
• Date: Thu Aug 14 14:49:15 1997
• Orig file: v2.1.49/linux/include/net/tcp.h
• Orig date: Mon Aug 11 14:47:05 1997

diff -u --recursive --new-file v2.1.49/linux/include/net/tcp.h linux/include/net/tcp.h
@@ -60,6 +60,22 @@
 	return (lport ^ (lport >> 7)) & (TCP_BHTABLE_SIZE - 1);
 }
 
+/* Find the next port that hashes h that is larger than lport.
+ * If you change the hash, change this function to match, or you will
+ * break TCP port selection. This function must also NOT wrap around
+ * when the next number exceeds the largest possible port (2^16-1).
+ */
+static __inline__ int tcp_bhashnext(__u16 short lport, __u16 h)
+{
+        __u32 s;	/* don't change this to a smaller type! */
+
+        s = (lport ^ (h ^ tcp_bhashfn(lport)));
+        if (s > lport)
+                return s;
+        s = lport + TCP_BHTABLE_SIZE;
+        return (s ^ (h ^ tcp_bhashfn(s)));
+}
+
 static __inline__ int tcp_sk_bhashfn(struct sock *sk)
 {
 	__u16 lport = sk->num;