d4cada4ae1
Union sk_hash with two u16 hashes for udp (no extra memory taken) One 16 bits hash on (local port) value (the previous udp 'hash') One 16 bits hash on (local address, local port) values, initialized but not yet used. This second hash is using jenkin hash for better distribution. Because the 'port' is xored later, a partial hash is performed on local address + net_hash_mix(net) Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
95 lines
2.7 KiB
C
95 lines
2.7 KiB
C
/*
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* INET An implementation of the TCP/IP protocol suite for the LINUX
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* operating system. INET is implemented using the BSD Socket
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* interface as the means of communication with the user level.
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*
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* Definitions for the UDP protocol.
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*
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* Version: @(#)udp.h 1.0.2 04/28/93
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*
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* Author: Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#ifndef _LINUX_UDP_H
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#define _LINUX_UDP_H
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#include <linux/types.h>
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struct udphdr {
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__be16 source;
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__be16 dest;
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__be16 len;
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__sum16 check;
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};
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/* UDP socket options */
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#define UDP_CORK 1 /* Never send partially complete segments */
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#define UDP_ENCAP 100 /* Set the socket to accept encapsulated packets */
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/* UDP encapsulation types */
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#define UDP_ENCAP_ESPINUDP_NON_IKE 1 /* draft-ietf-ipsec-nat-t-ike-00/01 */
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#define UDP_ENCAP_ESPINUDP 2 /* draft-ietf-ipsec-udp-encaps-06 */
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#define UDP_ENCAP_L2TPINUDP 3 /* rfc2661 */
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#ifdef __KERNEL__
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#include <net/inet_sock.h>
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#include <linux/skbuff.h>
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#include <net/netns/hash.h>
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static inline struct udphdr *udp_hdr(const struct sk_buff *skb)
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{
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return (struct udphdr *)skb_transport_header(skb);
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}
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#define UDP_HTABLE_SIZE_MIN (CONFIG_BASE_SMALL ? 128 : 256)
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static inline int udp_hashfn(struct net *net, unsigned num, unsigned mask)
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{
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return (num + net_hash_mix(net)) & mask;
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}
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struct udp_sock {
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/* inet_sock has to be the first member */
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struct inet_sock inet;
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#define udp_port_hash inet.sk.__sk_common.skc_u16hashes[0]
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#define udp_portaddr_hash inet.sk.__sk_common.skc_u16hashes[1]
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int pending; /* Any pending frames ? */
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unsigned int corkflag; /* Cork is required */
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__u16 encap_type; /* Is this an Encapsulation socket? */
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/*
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* Following member retains the information to create a UDP header
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* when the socket is uncorked.
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*/
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__u16 len; /* total length of pending frames */
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/*
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* Fields specific to UDP-Lite.
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*/
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__u16 pcslen;
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__u16 pcrlen;
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/* indicator bits used by pcflag: */
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#define UDPLITE_BIT 0x1 /* set by udplite proto init function */
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#define UDPLITE_SEND_CC 0x2 /* set via udplite setsockopt */
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#define UDPLITE_RECV_CC 0x4 /* set via udplite setsocktopt */
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__u8 pcflag; /* marks socket as UDP-Lite if > 0 */
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__u8 unused[3];
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/*
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* For encapsulation sockets.
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*/
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int (*encap_rcv)(struct sock *sk, struct sk_buff *skb);
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};
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static inline struct udp_sock *udp_sk(const struct sock *sk)
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{
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return (struct udp_sock *)sk;
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}
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#define IS_UDPLITE(__sk) (udp_sk(__sk)->pcflag)
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#endif
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#endif /* _LINUX_UDP_H */
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