1 files changed, 40 insertions, 0 deletions

diff --git a/include/net/inet_hashtables.h b/include/net/inet_hashtables.h
new file mode 100644
index 000000000000..c4c9e39f4505
--- /dev/null
+++ b/include/net/inet_hashtables.h
@@ -0,0 +1,40 @@
+/*
+ * INET         An implementation of the TCP/IP protocol suite for the LINUX
+ *              operating system.  INET is implemented using the BSD Socket
+ *              interface as the means of communication with the user level.
+ *
+ * Authors:     Lotsa people, from code originally in tcp
+ *
+ *      This program is free software; you can redistribute it and/or
+ *      modify it under the terms of the GNU General Public License
+ *      as published by the Free Software Foundation; either version
+ *      2 of the License, or (at your option) any later version.
+ */
+
+#ifndef _INET_HASHTABLES_H
+#define _INET_HASHTABLES_H
+
+#include <linux/types.h>
+
+static inline int inet_ehashfn(const __u32 laddr, const __u16 lport,
+                               const __u32 faddr, const __u16 fport,
+                               const int ehash_size)
+{
+        int h = (laddr ^ lport) ^ (faddr ^ fport);
+        h ^= h >> 16;
+        h ^= h >> 8;
+        return h & (ehash_size - 1);
+}
+
+static inline int inet_sk_ehashfn(const struct sock *sk, const int ehash_size)
+{
+        const struct inet_sock *inet = inet_sk(sk);
+        const __u32 laddr = inet->rcv_saddr;
+        const __u16 lport = inet->num;
+        const __u32 faddr = inet->daddr;
+        const __u16 fport = inet->dport;
+
+        return inet_ehashfn(laddr, lport, faddr, fport, ehash_size);
+}
+
+#endif /* _INET_HASHTABLES_H */