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linux
1/*
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 the IP protocol.
7 *
8 * Version: @(#)ip.h 1.0.2 04/28/93
9 *
10 * Authors: Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
11 *
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * as published by the Free Software Foundation; either version
15 * 2 of the License, or (at your option) any later version.
16 */
17#ifndef _LINUX_IP_H
18#define _LINUX_IP_H
19#include <asm/byteorder.h>
20
21#define IPTOS_TOS_MASK 0x1E
22#define IPTOS_TOS(tos) ((tos)&IPTOS_TOS_MASK)
23#define IPTOS_LOWDELAY 0x10
24#define IPTOS_THROUGHPUT 0x08
25#define IPTOS_RELIABILITY 0x04
26#define IPTOS_MINCOST 0x02
27
28#define IPTOS_PREC_MASK 0xE0
29#define IPTOS_PREC(tos) ((tos)&IPTOS_PREC_MASK)
30#define IPTOS_PREC_NETCONTROL 0xe0
31#define IPTOS_PREC_INTERNETCONTROL 0xc0
32#define IPTOS_PREC_CRITIC_ECP 0xa0
33#define IPTOS_PREC_FLASHOVERRIDE 0x80
34#define IPTOS_PREC_FLASH 0x60
35#define IPTOS_PREC_IMMEDIATE 0x40
36#define IPTOS_PREC_PRIORITY 0x20
37#define IPTOS_PREC_ROUTINE 0x00
38
39
40/* IP options */
41#define IPOPT_COPY 0x80
42#define IPOPT_CLASS_MASK 0x60
43#define IPOPT_NUMBER_MASK 0x1f
44
45#define IPOPT_COPIED(o) ((o)&IPOPT_COPY)
46#define IPOPT_CLASS(o) ((o)&IPOPT_CLASS_MASK)
47#define IPOPT_NUMBER(o) ((o)&IPOPT_NUMBER_MASK)
48
49#define IPOPT_CONTROL 0x00
50#define IPOPT_RESERVED1 0x20
51#define IPOPT_MEASUREMENT 0x40
52#define IPOPT_RESERVED2 0x60
53
54#define IPOPT_END (0 |IPOPT_CONTROL)
55#define IPOPT_NOOP (1 |IPOPT_CONTROL)
56#define IPOPT_SEC (2 |IPOPT_CONTROL|IPOPT_COPY)
57#define IPOPT_LSRR (3 |IPOPT_CONTROL|IPOPT_COPY)
58#define IPOPT_TIMESTAMP (4 |IPOPT_MEASUREMENT)
59#define IPOPT_RR (7 |IPOPT_CONTROL)
60#define IPOPT_SID (8 |IPOPT_CONTROL|IPOPT_COPY)
61#define IPOPT_SSRR (9 |IPOPT_CONTROL|IPOPT_COPY)
62#define IPOPT_RA (20|IPOPT_CONTROL|IPOPT_COPY)
63
64#define IPVERSION 4
65#define MAXTTL 255
66#define IPDEFTTL 64
67
68#define IPOPT_OPTVAL 0
69#define IPOPT_OLEN 1
70#define IPOPT_OFFSET 2
71#define IPOPT_MINOFF 4
72#define MAX_IPOPTLEN 40
73#define IPOPT_NOP IPOPT_NOOP
74#define IPOPT_EOL IPOPT_END
75#define IPOPT_TS IPOPT_TIMESTAMP
76
77#define IPOPT_TS_TSONLY 0 /* timestamps only */
78#define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */
79#define IPOPT_TS_PRESPEC 3 /* specified modules only */
80
81#ifdef __KERNEL__
82#include <linux/config.h>
83#include <linux/types.h>
84#include <net/request_sock.h>
85#include <net/sock.h>
86#include <linux/igmp.h>
87#include <net/flow.h>
88
89struct ip_options {
90 __u32 faddr; /* Saved first hop address */
91 unsigned char optlen;
92 unsigned char srr;
93 unsigned char rr;
94 unsigned char ts;
95 unsigned char is_setbyuser:1, /* Set by setsockopt? */
96 is_data:1, /* Options in __data, rather than skb */
97 is_strictroute:1, /* Strict source route */
98 srr_is_hit:1, /* Packet destination addr was our one */
99 is_changed:1, /* IP checksum more not valid */
100 rr_needaddr:1, /* Need to record addr of outgoing dev */
101 ts_needtime:1, /* Need to record timestamp */
102 ts_needaddr:1; /* Need to record addr of outgoing dev */
103 unsigned char router_alert;
104 unsigned char __pad1;
105 unsigned char __pad2;
106 unsigned char __data[0];
107};
108
109#define optlength(opt) (sizeof(struct ip_options) + opt->optlen)
110
111struct inet_request_sock {
112 struct request_sock req;
113 u32 loc_addr;
114 u32 rmt_addr;
115 u16 rmt_port;
116 u16 snd_wscale : 4,
117 rcv_wscale : 4,
118 tstamp_ok : 1,
119 sack_ok : 1,
120 wscale_ok : 1,
121 ecn_ok : 1,
122 acked : 1;
123 struct ip_options *opt;
124};
125
126static inline struct inet_request_sock *inet_rsk(const struct request_sock *sk)
127{
128 return (struct inet_request_sock *)sk;
129}
130
131struct ipv6_pinfo;
132
133struct inet_sock {
134 /* sk and pinet6 has to be the first two members of inet_sock */
135 struct sock sk;
136#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
137 struct ipv6_pinfo *pinet6;
138#endif
139 /* Socket demultiplex comparisons on incoming packets. */
140 __u32 daddr; /* Foreign IPv4 addr */
141 __u32 rcv_saddr; /* Bound local IPv4 addr */
142 __u16 dport; /* Destination port */
143 __u16 num; /* Local port */
144 __u32 saddr; /* Sending source */
145 __s16 uc_ttl; /* Unicast TTL */
146 __u16 cmsg_flags;
147 struct ip_options *opt;
148 __u16 sport; /* Source port */
149 __u16 id; /* ID counter for DF pkts */
150 __u8 tos; /* TOS */
151 __u8 mc_ttl; /* Multicasting TTL */
152 __u8 pmtudisc;
153 unsigned recverr : 1,
154 freebind : 1,
155 hdrincl : 1,
156 mc_loop : 1;
157 int mc_index; /* Multicast device index */
158 __u32 mc_addr;
159 struct ip_mc_socklist *mc_list; /* Group array */
160 /*
161 * Following members are used to retain the infomation to build
162 * an ip header on each ip fragmentation while the socket is corked.
163 */
164 struct {
165 unsigned int flags;
166 unsigned int fragsize;
167 struct ip_options *opt;
168 struct rtable *rt;
169 int length; /* Total length of all frames */
170 u32 addr;
171 struct flowi fl;
172 } cork;
173};
174
175#define IPCORK_OPT 1 /* ip-options has been held in ipcork.opt */
176#define IPCORK_ALLFRAG 2 /* always fragment (for ipv6 for now) */
177
178static inline struct inet_sock *inet_sk(const struct sock *sk)
179{
180 return (struct inet_sock *)sk;
181}
182
183static inline void __inet_sk_copy_descendant(struct sock *sk_to,
184 const struct sock *sk_from,
185 const int ancestor_size)
186{
187 memcpy(inet_sk(sk_to) + 1, inet_sk(sk_from) + 1,
188 sk_from->sk_prot->obj_size - ancestor_size);
189}
190#if !(defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE))
191static inline void inet_sk_copy_descendant(struct sock *sk_to,
192 const struct sock *sk_from)
193{
194 __inet_sk_copy_descendant(sk_to, sk_from, sizeof(struct inet_sock));
195}
196#endif
197#endif
198
199struct iphdr {
200#if defined(__LITTLE_ENDIAN_BITFIELD)
201 __u8 ihl:4,
202 version:4;
203#elif defined (__BIG_ENDIAN_BITFIELD)
204 __u8 version:4,
205 ihl:4;
206#else
207#error "Please fix <asm/byteorder.h>"
208#endif
209 __u8 tos;
210 __u16 tot_len;
211 __u16 id;
212 __u16 frag_off;
213 __u8 ttl;
214 __u8 protocol;
215 __u16 check;
216 __u32 saddr;
217 __u32 daddr;
218 /*The options start here. */
219};
220
221struct ip_auth_hdr {
222 __u8 nexthdr;
223 __u8 hdrlen; /* This one is measured in 32 bit units! */
224 __u16 reserved;
225 __u32 spi;
226 __u32 seq_no; /* Sequence number */
227 __u8 auth_data[0]; /* Variable len but >=4. Mind the 64 bit alignment! */
228};
229
230struct ip_esp_hdr {
231 __u32 spi;
232 __u32 seq_no; /* Sequence number */
233 __u8 enc_data[0]; /* Variable len but >=8. Mind the 64 bit alignment! */
234};
235
236struct ip_comp_hdr {
237 __u8 nexthdr;
238 __u8 flags;
239 __u16 cpi;
240};
241
242#endif /* _LINUX_IP_H */