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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>
Pavel Emelyanov0b441912008-06-16 17:14:11 -070027#include <net/netns/hash.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;
Denis V. Lunevef722492008-03-22 16:35:29 -070046 unsigned char is_strictroute:1,
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020047 srr_is_hit:1,
48 is_changed:1,
49 rr_needaddr:1,
50 ts_needtime:1,
51 ts_needaddr:1;
52 unsigned char router_alert;
Paul Moore11a03f72006-08-03 16:46:20 -070053 unsigned char cipso;
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020054 unsigned char __pad2;
55 unsigned char __data[0];
56};
57
58#define optlength(opt) (sizeof(struct ip_options) + opt->optlen)
59
60struct inet_request_sock {
61 struct request_sock req;
62#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
63 u16 inet6_rsk_offset;
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020064#endif
KOVACS Krisztiana3116ac52008-10-01 07:46:49 -070065 __be16 loc_port;
Al Viroadaf3452006-09-27 18:27:13 -070066 __be32 loc_addr;
67 __be32 rmt_addr;
Al Viroe11be942006-09-27 18:35:29 -070068 __be16 rmt_port;
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020069 u16 snd_wscale : 4,
70 rcv_wscale : 4,
71 tstamp_ok : 1,
72 sack_ok : 1,
73 wscale_ok : 1,
74 ecn_ok : 1,
KOVACS Krisztian88ef4a52008-10-01 07:41:00 -070075 acked : 1,
76 no_srccheck: 1;
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020077 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,
KOVACS Krisztianf5715ae2008-10-01 07:30:02 -0700132 mc_loop:1,
133 transparent:1;
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -0200134 int mc_index;
Al Viro011a9262006-09-26 21:27:35 -0700135 __be32 mc_addr;
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -0200136 struct ip_mc_socklist *mc_list;
137 struct {
138 unsigned int flags;
139 unsigned int fragsize;
140 struct ip_options *opt;
YOSHIFUJI Hideakic8cdaf92008-03-10 04:30:37 -0400141 struct dst_entry *dst;
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -0200142 int length; /* Total length of all frames */
Al Viro011a9262006-09-26 21:27:35 -0700143 __be32 addr;
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -0200144 struct flowi fl;
145 } cork;
146};
147
148#define IPCORK_OPT 1 /* ip-options has been held in ipcork.opt */
149#define IPCORK_ALLFRAG 2 /* always fragment (for ipv6 for now) */
150
151static inline struct inet_sock *inet_sk(const struct sock *sk)
152{
153 return (struct inet_sock *)sk;
154}
155
156static inline void __inet_sk_copy_descendant(struct sock *sk_to,
157 const struct sock *sk_from,
158 const int ancestor_size)
159{
160 memcpy(inet_sk(sk_to) + 1, inet_sk(sk_from) + 1,
161 sk_from->sk_prot->obj_size - ancestor_size);
162}
163#if !(defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE))
164static inline void inet_sk_copy_descendant(struct sock *sk_to,
165 const struct sock *sk_from)
166{
167 __inet_sk_copy_descendant(sk_to, sk_from, sizeof(struct inet_sock));
168}
169#endif
170
171extern int inet_sk_rebuild_header(struct sock *sk);
172
David S. Millerb3da2cf2007-03-23 11:40:27 -0700173extern u32 inet_ehash_secret;
174extern void build_ehash_secret(void);
175
Pavel Emelyanov9f26b3a2008-06-16 17:13:27 -0700176static inline unsigned int inet_ehashfn(struct net *net,
177 const __be32 laddr, const __u16 lport,
Al Virofb99c842006-09-27 18:43:33 -0700178 const __be32 faddr, const __be16 fport)
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -0200179{
David S. Miller7adc3832008-03-04 14:28:41 -0800180 return jhash_3words((__force __u32) laddr,
181 (__force __u32) faddr,
David S. Millerb3da2cf2007-03-23 11:40:27 -0700182 ((__u32) lport) << 16 | (__force __u32)fport,
Pavel Emelyanov0b441912008-06-16 17:14:11 -0700183 inet_ehash_secret + net_hash_mix(net));
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -0200184}
185
186static inline int inet_sk_ehashfn(const struct sock *sk)
187{
188 const struct inet_sock *inet = inet_sk(sk);
Al Virofb99c842006-09-27 18:43:33 -0700189 const __be32 laddr = inet->rcv_saddr;
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -0200190 const __u16 lport = inet->num;
Al Virofb99c842006-09-27 18:43:33 -0700191 const __be32 faddr = inet->daddr;
192 const __be16 fport = inet->dport;
Pavel Emelyanov9f26b3a2008-06-16 17:13:27 -0700193 struct net *net = sock_net(sk);
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -0200194
Pavel Emelyanov9f26b3a2008-06-16 17:13:27 -0700195 return inet_ehashfn(net, laddr, lport, faddr, fport);
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -0200196}
197
Arnaldo Carvalho de Meloce4a7d02008-06-10 12:39:35 -0700198static inline struct request_sock *inet_reqsk_alloc(struct request_sock_ops *ops)
199{
200 struct request_sock *req = reqsk_alloc(ops);
201
202 if (req != NULL)
203 inet_rsk(req)->opt = NULL;
204
205 return req;
206}
207
KOVACS Krisztian88ef4a52008-10-01 07:41:00 -0700208static inline __u8 inet_sk_flowi_flags(const struct sock *sk)
209{
210 return inet_sk(sk)->transparent ? FLOWI_FLAG_ANYSRC : 0;
211}
212
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -0200213#endif /* _INET_SOCK_H */