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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
Vegard Nossum45e3ff82008-09-09 06:43:12 +020020#include <linux/kmemcheck.h>
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020021#include <linux/string.h>
22#include <linux/types.h>
David S. Millerb3da2cf2007-03-23 11:40:27 -070023#include <linux/jhash.h>
Tom Herbertfec5e652010-04-16 16:01:27 -070024#include <linux/netdevice.h>
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020025
26#include <net/flow.h>
27#include <net/sock.h>
28#include <net/request_sock.h>
Pavel Emelyanov0b441912008-06-16 17:14:11 -070029#include <net/netns/hash.h>
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020030
31/** struct ip_options - IP Options
32 *
33 * @faddr - Saved first hop address
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020034 * @is_data - Options in __data, rather than skb
35 * @is_strictroute - Strict source route
36 * @srr_is_hit - Packet destination addr was our one
37 * @is_changed - IP checksum more not valid
38 * @rr_needaddr - Need to record addr of outgoing dev
39 * @ts_needtime - Need to record timestamp
40 * @ts_needaddr - Need to record addr of outgoing dev
41 */
42struct ip_options {
Al Viro3ca3c682006-09-27 18:28:07 -070043 __be32 faddr;
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020044 unsigned char optlen;
45 unsigned char srr;
46 unsigned char rr;
47 unsigned char ts;
Denis V. Lunevef722492008-03-22 16:35:29 -070048 unsigned char is_strictroute:1,
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020049 srr_is_hit:1,
50 is_changed:1,
51 rr_needaddr:1,
52 ts_needtime:1,
53 ts_needaddr:1;
54 unsigned char router_alert;
Paul Moore11a03f72006-08-03 16:46:20 -070055 unsigned char cipso;
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020056 unsigned char __pad2;
57 unsigned char __data[0];
58};
59
60#define optlength(opt) (sizeof(struct ip_options) + opt->optlen)
61
62struct inet_request_sock {
63 struct request_sock req;
64#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
65 u16 inet6_rsk_offset;
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020066#endif
KOVACS Krisztiana3116ac2008-10-01 07:46:49 -070067 __be16 loc_port;
Al Viroadaf3452006-09-27 18:27:13 -070068 __be32 loc_addr;
69 __be32 rmt_addr;
Al Viroe11be942006-09-27 18:35:29 -070070 __be16 rmt_port;
Vegard Nossum45e3ff82008-09-09 06:43:12 +020071 kmemcheck_bitfield_begin(flags);
72 u16 snd_wscale : 4,
73 rcv_wscale : 4,
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020074 tstamp_ok : 1,
75 sack_ok : 1,
76 wscale_ok : 1,
77 ecn_ok : 1,
KOVACS Krisztian88ef4a52008-10-01 07:41:00 -070078 acked : 1,
79 no_srccheck: 1;
Vegard Nossum45e3ff82008-09-09 06:43:12 +020080 kmemcheck_bitfield_end(flags);
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020081 struct ip_options *opt;
82};
83
84static inline struct inet_request_sock *inet_rsk(const struct request_sock *sk)
85{
86 return (struct inet_request_sock *)sk;
87}
88
89struct ip_mc_socklist;
90struct ipv6_pinfo;
91struct rtable;
92
93/** struct inet_sock - representation of INET sockets
94 *
95 * @sk - ancestor class
96 * @pinet6 - pointer to IPv6 control block
Eric Dumazetc720c7e2009-10-15 06:30:45 +000097 * @inet_daddr - Foreign IPv4 addr
98 * @inet_rcv_saddr - Bound local IPv4 addr
99 * @inet_dport - Destination port
100 * @inet_num - Local port
101 * @inet_saddr - Sending source
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -0200102 * @uc_ttl - Unicast TTL
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000103 * @inet_sport - Source port
104 * @inet_id - ID counter for DF pkts
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -0200105 * @tos - TOS
106 * @mc_ttl - Multicasting TTL
107 * @is_icsk - is this an inet_connection_sock?
108 * @mc_index - Multicast device index
109 * @mc_list - Group array
110 * @cork - info to build ip hdr on each ip frag while socket is corked
111 */
112struct inet_sock {
113 /* sk and pinet6 has to be the first two members of inet_sock */
114 struct sock sk;
115#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
116 struct ipv6_pinfo *pinet6;
117#endif
118 /* Socket demultiplex comparisons on incoming packets. */
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000119 __be32 inet_daddr;
120 __be32 inet_rcv_saddr;
121 __be16 inet_dport;
122 __u16 inet_num;
123 __be32 inet_saddr;
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -0200124 __s16 uc_ttl;
125 __u16 cmsg_flags;
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000126 __be16 inet_sport;
127 __u16 inet_id;
Stephen Hemmingerd218d112010-01-11 16:28:01 -0800128
129 struct ip_options *opt;
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -0200130 __u8 tos;
Stephen Hemmingerd218d112010-01-11 16:28:01 -0800131 __u8 min_ttl;
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -0200132 __u8 mc_ttl;
133 __u8 pmtudisc;
134 __u8 recverr:1,
135 is_icsk:1,
136 freebind:1,
137 hdrincl:1,
KOVACS Krisztianf5715ae2008-10-01 07:30:02 -0700138 mc_loop:1,
Nivedita Singhvif771bef2009-05-28 07:00:46 +0000139 transparent:1,
Jiri Olsa7b2ff182010-06-15 01:07:31 +0000140 mc_all:1,
141 nodefrag:1;
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -0200142 int mc_index;
Al Viro011a9262006-09-26 21:27:35 -0700143 __be32 mc_addr;
Eric Dumazet1d7138d2010-11-12 05:46:50 +0000144 struct ip_mc_socklist __rcu *mc_list;
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -0200145 struct {
146 unsigned int flags;
147 unsigned int fragsize;
148 struct ip_options *opt;
YOSHIFUJI Hideakic8cdaf92008-03-10 04:30:37 -0400149 struct dst_entry *dst;
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -0200150 int length; /* Total length of all frames */
Al Viro011a9262006-09-26 21:27:35 -0700151 __be32 addr;
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -0200152 struct flowi fl;
153 } cork;
154};
155
156#define IPCORK_OPT 1 /* ip-options has been held in ipcork.opt */
157#define IPCORK_ALLFRAG 2 /* always fragment (for ipv6 for now) */
158
159static inline struct inet_sock *inet_sk(const struct sock *sk)
160{
161 return (struct inet_sock *)sk;
162}
163
164static inline void __inet_sk_copy_descendant(struct sock *sk_to,
165 const struct sock *sk_from,
166 const int ancestor_size)
167{
168 memcpy(inet_sk(sk_to) + 1, inet_sk(sk_from) + 1,
169 sk_from->sk_prot->obj_size - ancestor_size);
170}
171#if !(defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE))
172static inline void inet_sk_copy_descendant(struct sock *sk_to,
173 const struct sock *sk_from)
174{
175 __inet_sk_copy_descendant(sk_to, sk_from, sizeof(struct inet_sock));
176}
177#endif
178
179extern int inet_sk_rebuild_header(struct sock *sk);
180
David S. Millerb3da2cf2007-03-23 11:40:27 -0700181extern u32 inet_ehash_secret;
182extern void build_ehash_secret(void);
183
Pavel Emelyanov9f26b3a2008-06-16 17:13:27 -0700184static inline unsigned int inet_ehashfn(struct net *net,
185 const __be32 laddr, const __u16 lport,
Al Virofb99c842006-09-27 18:43:33 -0700186 const __be32 faddr, const __be16 fport)
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -0200187{
David S. Miller7adc3832008-03-04 14:28:41 -0800188 return jhash_3words((__force __u32) laddr,
189 (__force __u32) faddr,
David S. Millerb3da2cf2007-03-23 11:40:27 -0700190 ((__u32) lport) << 16 | (__force __u32)fport,
Pavel Emelyanov0b441912008-06-16 17:14:11 -0700191 inet_ehash_secret + net_hash_mix(net));
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -0200192}
193
194static inline int inet_sk_ehashfn(const struct sock *sk)
195{
196 const struct inet_sock *inet = inet_sk(sk);
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000197 const __be32 laddr = inet->inet_rcv_saddr;
198 const __u16 lport = inet->inet_num;
199 const __be32 faddr = inet->inet_daddr;
200 const __be16 fport = inet->inet_dport;
Pavel Emelyanov9f26b3a2008-06-16 17:13:27 -0700201 struct net *net = sock_net(sk);
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -0200202
Pavel Emelyanov9f26b3a2008-06-16 17:13:27 -0700203 return inet_ehashfn(net, laddr, lport, faddr, fport);
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -0200204}
205
Arnaldo Carvalho de Meloce4a7d02008-06-10 12:39:35 -0700206static inline struct request_sock *inet_reqsk_alloc(struct request_sock_ops *ops)
207{
208 struct request_sock *req = reqsk_alloc(ops);
Vegard Nossum45e3ff82008-09-09 06:43:12 +0200209 struct inet_request_sock *ireq = inet_rsk(req);
Arnaldo Carvalho de Meloce4a7d02008-06-10 12:39:35 -0700210
Vegard Nossum45e3ff82008-09-09 06:43:12 +0200211 if (req != NULL) {
212 kmemcheck_annotate_bitfield(ireq, flags);
213 ireq->opt = NULL;
214 }
Arnaldo Carvalho de Meloce4a7d02008-06-10 12:39:35 -0700215
216 return req;
217}
218
KOVACS Krisztian88ef4a52008-10-01 07:41:00 -0700219static inline __u8 inet_sk_flowi_flags(const struct sock *sk)
220{
221 return inet_sk(sk)->transparent ? FLOWI_FLAG_ANYSRC : 0;
222}
223
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -0200224#endif /* _INET_SOCK_H */