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Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -02001/*
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 * Definitions for inet_sock
7 *
8 * Authors: Many, reorganised here by
9 * Arnaldo Carvalho de Melo <acme@mandriva.com>
10 *
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License
13 * as published by the Free Software Foundation; either version
14 * 2 of the License, or (at your option) any later version.
15 */
16#ifndef _INET_SOCK_H
17#define _INET_SOCK_H
18
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020019
20#include <linux/string.h>
21#include <linux/types.h>
David S. Millerb3da2cf2007-03-23 11:40:27 -070022#include <linux/jhash.h>
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020023
24#include <net/flow.h>
25#include <net/sock.h>
26#include <net/request_sock.h>
Vlad Yasevichfee9dee2007-10-25 18:54:46 -070027#include <net/route.h>
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020028
29/** struct ip_options - IP Options
30 *
31 * @faddr - Saved first hop address
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020032 * @is_data - Options in __data, rather than skb
33 * @is_strictroute - Strict source route
34 * @srr_is_hit - Packet destination addr was our one
35 * @is_changed - IP checksum more not valid
36 * @rr_needaddr - Need to record addr of outgoing dev
37 * @ts_needtime - Need to record timestamp
38 * @ts_needaddr - Need to record addr of outgoing dev
39 */
40struct ip_options {
Al Viro3ca3c682006-09-27 18:28:07 -070041 __be32 faddr;
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020042 unsigned char optlen;
43 unsigned char srr;
44 unsigned char rr;
45 unsigned char ts;
Louis Nyffenegger1a019122006-08-08 00:56:11 -070046 unsigned char is_data:1,
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020047 is_strictroute:1,
48 srr_is_hit:1,
49 is_changed:1,
50 rr_needaddr:1,
51 ts_needtime:1,
52 ts_needaddr:1;
53 unsigned char router_alert;
Paul Moore11a03f72006-08-03 16:46:20 -070054 unsigned char cipso;
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020055 unsigned char __pad2;
56 unsigned char __data[0];
57};
58
59#define optlength(opt) (sizeof(struct ip_options) + opt->optlen)
60
61struct inet_request_sock {
62 struct request_sock req;
63#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
64 u16 inet6_rsk_offset;
65 /* 2 bytes hole, try to pack */
66#endif
Al Viroadaf3452006-09-27 18:27:13 -070067 __be32 loc_addr;
68 __be32 rmt_addr;
Al Viroe11be942006-09-27 18:35:29 -070069 __be16 rmt_port;
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020070 u16 snd_wscale : 4,
71 rcv_wscale : 4,
72 tstamp_ok : 1,
73 sack_ok : 1,
74 wscale_ok : 1,
75 ecn_ok : 1,
76 acked : 1;
77 struct ip_options *opt;
78};
79
80static inline struct inet_request_sock *inet_rsk(const struct request_sock *sk)
81{
82 return (struct inet_request_sock *)sk;
83}
84
85struct ip_mc_socklist;
86struct ipv6_pinfo;
87struct rtable;
88
89/** struct inet_sock - representation of INET sockets
90 *
91 * @sk - ancestor class
92 * @pinet6 - pointer to IPv6 control block
93 * @daddr - Foreign IPv4 addr
94 * @rcv_saddr - Bound local IPv4 addr
95 * @dport - Destination port
96 * @num - Local port
97 * @saddr - Sending source
98 * @uc_ttl - Unicast TTL
99 * @sport - Source port
100 * @id - ID counter for DF pkts
101 * @tos - TOS
102 * @mc_ttl - Multicasting TTL
103 * @is_icsk - is this an inet_connection_sock?
104 * @mc_index - Multicast device index
105 * @mc_list - Group array
106 * @cork - info to build ip hdr on each ip frag while socket is corked
107 */
108struct inet_sock {
109 /* sk and pinet6 has to be the first two members of inet_sock */
110 struct sock sk;
111#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
112 struct ipv6_pinfo *pinet6;
113#endif
114 /* Socket demultiplex comparisons on incoming packets. */
Al Viro011a9262006-09-26 21:27:35 -0700115 __be32 daddr;
116 __be32 rcv_saddr;
Al Viro2816e122006-09-27 18:33:05 -0700117 __be16 dport;
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -0200118 __u16 num;
Al Viro011a9262006-09-26 21:27:35 -0700119 __be32 saddr;
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -0200120 __s16 uc_ttl;
121 __u16 cmsg_flags;
122 struct ip_options *opt;
Al Viro2816e122006-09-27 18:33:05 -0700123 __be16 sport;
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -0200124 __u16 id;
125 __u8 tos;
126 __u8 mc_ttl;
127 __u8 pmtudisc;
128 __u8 recverr:1,
129 is_icsk:1,
130 freebind:1,
131 hdrincl:1,
132 mc_loop:1;
133 int mc_index;
Al Viro011a9262006-09-26 21:27:35 -0700134 __be32 mc_addr;
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -0200135 struct ip_mc_socklist *mc_list;
136 struct {
137 unsigned int flags;
138 unsigned int fragsize;
139 struct ip_options *opt;
140 struct rtable *rt;
141 int length; /* Total length of all frames */
Al Viro011a9262006-09-26 21:27:35 -0700142 __be32 addr;
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -0200143 struct flowi fl;
144 } cork;
145};
146
147#define IPCORK_OPT 1 /* ip-options has been held in ipcork.opt */
148#define IPCORK_ALLFRAG 2 /* always fragment (for ipv6 for now) */
149
150static inline struct inet_sock *inet_sk(const struct sock *sk)
151{
152 return (struct inet_sock *)sk;
153}
154
155static inline void __inet_sk_copy_descendant(struct sock *sk_to,
156 const struct sock *sk_from,
157 const int ancestor_size)
158{
159 memcpy(inet_sk(sk_to) + 1, inet_sk(sk_from) + 1,
160 sk_from->sk_prot->obj_size - ancestor_size);
161}
162#if !(defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE))
163static inline void inet_sk_copy_descendant(struct sock *sk_to,
164 const struct sock *sk_from)
165{
166 __inet_sk_copy_descendant(sk_to, sk_from, sizeof(struct inet_sock));
167}
168#endif
169
170extern int inet_sk_rebuild_header(struct sock *sk);
171
David S. Millerb3da2cf2007-03-23 11:40:27 -0700172extern u32 inet_ehash_secret;
173extern void build_ehash_secret(void);
174
Al Virofb99c842006-09-27 18:43:33 -0700175static inline unsigned int inet_ehashfn(const __be32 laddr, const __u16 lport,
176 const __be32 faddr, const __be16 fport)
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -0200177{
David S. Millerb3da2cf2007-03-23 11:40:27 -0700178 return jhash_2words((__force __u32) laddr ^ (__force __u32) faddr,
179 ((__u32) lport) << 16 | (__force __u32)fport,
180 inet_ehash_secret);
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -0200181}
182
183static inline int inet_sk_ehashfn(const struct sock *sk)
184{
185 const struct inet_sock *inet = inet_sk(sk);
Al Virofb99c842006-09-27 18:43:33 -0700186 const __be32 laddr = inet->rcv_saddr;
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -0200187 const __u16 lport = inet->num;
Al Virofb99c842006-09-27 18:43:33 -0700188 const __be32 faddr = inet->daddr;
189 const __be16 fport = inet->dport;
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -0200190
191 return inet_ehashfn(laddr, lport, faddr, fport);
192}
193
Vlad Yasevichfee9dee2007-10-25 18:54:46 -0700194
195static inline int inet_iif(const struct sk_buff *skb)
196{
197 return ((struct rtable *)skb->dst)->rt_iif;
198}
199
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -0200200#endif /* _INET_SOCK_H */