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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>
22
23#include <net/flow.h>
24#include <net/sock.h>
25#include <net/request_sock.h>
26
27/** struct ip_options - IP Options
28 *
29 * @faddr - Saved first hop address
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020030 * @is_data - Options in __data, rather than skb
31 * @is_strictroute - Strict source route
32 * @srr_is_hit - Packet destination addr was our one
33 * @is_changed - IP checksum more not valid
34 * @rr_needaddr - Need to record addr of outgoing dev
35 * @ts_needtime - Need to record timestamp
36 * @ts_needaddr - Need to record addr of outgoing dev
37 */
38struct ip_options {
Al Viro3ca3c682006-09-27 18:28:07 -070039 __be32 faddr;
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020040 unsigned char optlen;
41 unsigned char srr;
42 unsigned char rr;
43 unsigned char ts;
Louis Nyffenegger1a019122006-08-08 00:56:11 -070044 unsigned char is_data:1,
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020045 is_strictroute:1,
46 srr_is_hit:1,
47 is_changed:1,
48 rr_needaddr:1,
49 ts_needtime:1,
50 ts_needaddr:1;
51 unsigned char router_alert;
Paul Moore11a03f72006-08-03 16:46:20 -070052 unsigned char cipso;
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020053 unsigned char __pad2;
54 unsigned char __data[0];
55};
56
57#define optlength(opt) (sizeof(struct ip_options) + opt->optlen)
58
59struct inet_request_sock {
60 struct request_sock req;
61#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
62 u16 inet6_rsk_offset;
63 /* 2 bytes hole, try to pack */
64#endif
Al Viroadaf3452006-09-27 18:27:13 -070065 __be32 loc_addr;
66 __be32 rmt_addr;
Al Viroe11be942006-09-27 18:35:29 -070067 __be16 rmt_port;
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020068 u16 snd_wscale : 4,
69 rcv_wscale : 4,
70 tstamp_ok : 1,
71 sack_ok : 1,
72 wscale_ok : 1,
73 ecn_ok : 1,
74 acked : 1;
75 struct ip_options *opt;
76};
77
78static inline struct inet_request_sock *inet_rsk(const struct request_sock *sk)
79{
80 return (struct inet_request_sock *)sk;
81}
82
83struct ip_mc_socklist;
84struct ipv6_pinfo;
85struct rtable;
86
87/** struct inet_sock - representation of INET sockets
88 *
89 * @sk - ancestor class
90 * @pinet6 - pointer to IPv6 control block
91 * @daddr - Foreign IPv4 addr
92 * @rcv_saddr - Bound local IPv4 addr
93 * @dport - Destination port
94 * @num - Local port
95 * @saddr - Sending source
96 * @uc_ttl - Unicast TTL
97 * @sport - Source port
98 * @id - ID counter for DF pkts
99 * @tos - TOS
100 * @mc_ttl - Multicasting TTL
101 * @is_icsk - is this an inet_connection_sock?
102 * @mc_index - Multicast device index
103 * @mc_list - Group array
104 * @cork - info to build ip hdr on each ip frag while socket is corked
105 */
106struct inet_sock {
107 /* sk and pinet6 has to be the first two members of inet_sock */
108 struct sock sk;
109#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
110 struct ipv6_pinfo *pinet6;
111#endif
112 /* Socket demultiplex comparisons on incoming packets. */
Al Viro011a9262006-09-26 21:27:35 -0700113 __be32 daddr;
114 __be32 rcv_saddr;
Al Viro2816e122006-09-27 18:33:05 -0700115 __be16 dport;
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -0200116 __u16 num;
Al Viro011a9262006-09-26 21:27:35 -0700117 __be32 saddr;
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -0200118 __s16 uc_ttl;
119 __u16 cmsg_flags;
120 struct ip_options *opt;
Al Viro2816e122006-09-27 18:33:05 -0700121 __be16 sport;
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -0200122 __u16 id;
123 __u8 tos;
124 __u8 mc_ttl;
125 __u8 pmtudisc;
126 __u8 recverr:1,
127 is_icsk:1,
128 freebind:1,
129 hdrincl:1,
130 mc_loop:1;
131 int mc_index;
Al Viro011a9262006-09-26 21:27:35 -0700132 __be32 mc_addr;
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -0200133 struct ip_mc_socklist *mc_list;
134 struct {
135 unsigned int flags;
136 unsigned int fragsize;
137 struct ip_options *opt;
138 struct rtable *rt;
139 int length; /* Total length of all frames */
Al Viro011a9262006-09-26 21:27:35 -0700140 __be32 addr;
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -0200141 struct flowi fl;
142 } cork;
143};
144
145#define IPCORK_OPT 1 /* ip-options has been held in ipcork.opt */
146#define IPCORK_ALLFRAG 2 /* always fragment (for ipv6 for now) */
147
148static inline struct inet_sock *inet_sk(const struct sock *sk)
149{
150 return (struct inet_sock *)sk;
151}
152
153static inline void __inet_sk_copy_descendant(struct sock *sk_to,
154 const struct sock *sk_from,
155 const int ancestor_size)
156{
157 memcpy(inet_sk(sk_to) + 1, inet_sk(sk_from) + 1,
158 sk_from->sk_prot->obj_size - ancestor_size);
159}
160#if !(defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE))
161static inline void inet_sk_copy_descendant(struct sock *sk_to,
162 const struct sock *sk_from)
163{
164 __inet_sk_copy_descendant(sk_to, sk_from, sizeof(struct inet_sock));
165}
166#endif
167
168extern int inet_sk_rebuild_header(struct sock *sk);
169
170static inline unsigned int inet_ehashfn(const __u32 laddr, const __u16 lport,
171 const __u32 faddr, const __u16 fport)
172{
173 unsigned int h = (laddr ^ lport) ^ (faddr ^ fport);
174 h ^= h >> 16;
175 h ^= h >> 8;
176 return h;
177}
178
179static inline int inet_sk_ehashfn(const struct sock *sk)
180{
181 const struct inet_sock *inet = inet_sk(sk);
182 const __u32 laddr = inet->rcv_saddr;
183 const __u16 lport = inet->num;
184 const __u32 faddr = inet->daddr;
185 const __u16 fport = inet->dport;
186
187 return inet_ehashfn(laddr, lport, faddr, fport);
188}
189
190#endif /* _INET_SOCK_H */