| Arnaldo Carvalho de Melo | 304a161 | 2005-08-09 19:59:20 -0700 | [diff] [blame] | 1 | /* |
| 2 | * INET An implementation of the TCP/IP protocol suite for the LINUX |
| 3 | * operating system. INET is implemented using the BSD Socket |
| 4 | * interface as the means of communication with the user level. |
| 5 | * |
| 6 | * Authors: Lotsa people, from code originally in tcp |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or |
| 9 | * modify it under the terms of the GNU General Public License |
| 10 | * as published by the Free Software Foundation; either version |
| 11 | * 2 of the License, or (at your option) any later version. |
| 12 | */ |
| 13 | |
| 14 | #ifndef _INET_HASHTABLES_H |
| 15 | #define _INET_HASHTABLES_H |
| 16 | |
| 17 | #include <linux/types.h> |
| 18 | |
| 19 | static inline int inet_ehashfn(const __u32 laddr, const __u16 lport, |
| 20 | const __u32 faddr, const __u16 fport, |
| 21 | const int ehash_size) |
| 22 | { |
| 23 | int h = (laddr ^ lport) ^ (faddr ^ fport); |
| 24 | h ^= h >> 16; |
| 25 | h ^= h >> 8; |
| 26 | return h & (ehash_size - 1); |
| 27 | } |
| 28 | |
| 29 | static inline int inet_sk_ehashfn(const struct sock *sk, const int ehash_size) |
| 30 | { |
| 31 | const struct inet_sock *inet = inet_sk(sk); |
| 32 | const __u32 laddr = inet->rcv_saddr; |
| 33 | const __u16 lport = inet->num; |
| 34 | const __u32 faddr = inet->daddr; |
| 35 | const __u16 fport = inet->dport; |
| 36 | |
| 37 | return inet_ehashfn(laddr, lport, faddr, fport, ehash_size); |
| 38 | } |
| 39 | |
| 40 | #endif /* _INET_HASHTABLES_H */ |