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* 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.
* Definitions for inet_sock
* Authors: Many, reorganised here by
* Arnaldo Carvalho de Melo <>
* 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_SOCK_H
#define _INET_SOCK_H
#include <linux/string.h>
#include <linux/types.h>
#include <linux/jhash.h>
#include <net/flow.h>
#include <net/sock.h>
#include <net/request_sock.h>
#include <net/route.h>
/** struct ip_options - IP Options
* @faddr - Saved first hop address
* @is_data - Options in __data, rather than skb
* @is_strictroute - Strict source route
* @srr_is_hit - Packet destination addr was our one
* @is_changed - IP checksum more not valid
* @rr_needaddr - Need to record addr of outgoing dev
* @ts_needtime - Need to record timestamp
* @ts_needaddr - Need to record addr of outgoing dev
struct ip_options {
__be32 faddr;
unsigned char optlen;
unsigned char srr;
unsigned char rr;
unsigned char ts;
unsigned char is_data:1,
unsigned char router_alert;
unsigned char cipso;
unsigned char __pad2;
unsigned char __data[0];
#define optlength(opt) (sizeof(struct ip_options) + opt->optlen)
struct inet_request_sock {
struct request_sock req;
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
u16 inet6_rsk_offset;
/* 2 bytes hole, try to pack */
__be32 loc_addr;
__be32 rmt_addr;
__be16 rmt_port;
u16 snd_wscale : 4,
rcv_wscale : 4,
tstamp_ok : 1,
sack_ok : 1,
wscale_ok : 1,
ecn_ok : 1,
acked : 1;
struct ip_options *opt;
static inline struct inet_request_sock *inet_rsk(const struct request_sock *sk)
return (struct inet_request_sock *)sk;
struct ip_mc_socklist;
struct ipv6_pinfo;
struct rtable;
/** struct inet_sock - representation of INET sockets
* @sk - ancestor class
* @pinet6 - pointer to IPv6 control block
* @daddr - Foreign IPv4 addr
* @rcv_saddr - Bound local IPv4 addr
* @dport - Destination port
* @num - Local port
* @saddr - Sending source
* @uc_ttl - Unicast TTL
* @sport - Source port
* @id - ID counter for DF pkts
* @tos - TOS
* @mc_ttl - Multicasting TTL
* @is_icsk - is this an inet_connection_sock?
* @mc_index - Multicast device index
* @mc_list - Group array
* @cork - info to build ip hdr on each ip frag while socket is corked
struct inet_sock {
/* sk and pinet6 has to be the first two members of inet_sock */
struct sock sk;
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
struct ipv6_pinfo *pinet6;
/* Socket demultiplex comparisons on incoming packets. */
__be32 daddr;
__be32 rcv_saddr;
__be16 dport;
__u16 num;
__be32 saddr;
__s16 uc_ttl;
__u16 cmsg_flags;
struct ip_options *opt;
__be16 sport;
__u16 id;
__u8 tos;
__u8 mc_ttl;
__u8 pmtudisc;
__u8 recverr:1,
int mc_index;
__be32 mc_addr;
struct ip_mc_socklist *mc_list;
struct {
unsigned int flags;
unsigned int fragsize;
struct ip_options *opt;
struct rtable *rt;
int length; /* Total length of all frames */
__be32 addr;
struct flowi fl;
} cork;
#define IPCORK_OPT 1 /* ip-options has been held in ipcork.opt */
#define IPCORK_ALLFRAG 2 /* always fragment (for ipv6 for now) */
static inline struct inet_sock *inet_sk(const struct sock *sk)
return (struct inet_sock *)sk;
static inline void __inet_sk_copy_descendant(struct sock *sk_to,
const struct sock *sk_from,
const int ancestor_size)
memcpy(inet_sk(sk_to) + 1, inet_sk(sk_from) + 1,
sk_from->sk_prot->obj_size - ancestor_size);
#if !(defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE))
static inline void inet_sk_copy_descendant(struct sock *sk_to,
const struct sock *sk_from)
__inet_sk_copy_descendant(sk_to, sk_from, sizeof(struct inet_sock));
extern int inet_sk_rebuild_header(struct sock *sk);
extern u32 inet_ehash_secret;
extern void build_ehash_secret(void);
static inline unsigned int inet_ehashfn(const __be32 laddr, const __u16 lport,
const __be32 faddr, const __be16 fport)
return jhash_3words((__force __u32) laddr,
(__force __u32) faddr,
((__u32) lport) << 16 | (__force __u32)fport,
static inline int inet_sk_ehashfn(const struct sock *sk)
const struct inet_sock *inet = inet_sk(sk);
const __be32 laddr = inet->rcv_saddr;
const __u16 lport = inet->num;
const __be32 faddr = inet->daddr;
const __be16 fport = inet->dport;
return inet_ehashfn(laddr, lport, faddr, fport);
static inline int inet_iif(const struct sk_buff *skb)
return ((struct rtable *)skb->dst)->rt_iif;
#endif /* _INET_SOCK_H */