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.
6 * Definitions for the IP protocol.
8 * Version: @(#)ip.h 1.0.2 04/28/93
10 * Authors: Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
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.
19 #include <asm/byteorder.h>
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
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
41 #define IPOPT_COPY 0x80
42 #define IPOPT_CLASS_MASK 0x60
43 #define IPOPT_NUMBER_MASK 0x1f
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)
49 #define IPOPT_CONTROL 0x00
50 #define IPOPT_RESERVED1 0x20
51 #define IPOPT_MEASUREMENT 0x40
52 #define IPOPT_RESERVED2 0x60
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)
68 #define IPOPT_OPTVAL 0
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
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 */
82 #include <linux/config.h>
83 #include <linux/types.h>
84 #include <net/request_sock.h>
86 #include <linux/igmp.h>
90 __u32 faddr; /* Saved first hop address */
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];
109 #define optlength(opt) (sizeof(struct ip_options) + opt->optlen)
111 struct inet_request_sock {
112 struct request_sock req;
123 struct ip_options *opt;
126 static inline struct inet_request_sock *inet_rsk(const struct request_sock *sk)
128 return (struct inet_request_sock *)sk;
134 /* sk and pinet6 has to be the first two members of inet_sock */
136 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
137 struct ipv6_pinfo *pinet6;
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 */
147 struct ip_options *opt;
148 __u16 sport; /* Source port */
149 __u16 id; /* ID counter for DF pkts */
151 __u8 mc_ttl; /* Multicasting TTL */
153 unsigned recverr : 1,
157 int mc_index; /* Multicast device index */
159 struct ip_mc_socklist *mc_list; /* Group array */
161 * Following members are used to retain the infomation to build
162 * an ip header on each ip fragmentation while the socket is corked.
166 unsigned int fragsize;
167 struct ip_options *opt;
169 int length; /* Total length of all frames */
175 #define IPCORK_OPT 1 /* ip-options has been held in ipcork.opt */
176 #define IPCORK_ALLFRAG 2 /* always fragment (for ipv6 for now) */
178 static inline struct inet_sock *inet_sk(const struct sock *sk)
180 return (struct inet_sock *)sk;
183 static inline void __inet_sk_copy_descendant(struct sock *sk_to,
184 const struct sock *sk_from,
185 const int ancestor_size)
187 memcpy(inet_sk(sk_to) + 1, inet_sk(sk_from) + 1,
188 sk_from->sk_prot->obj_size - ancestor_size);
190 #if !(defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE))
191 static inline void inet_sk_copy_descendant(struct sock *sk_to,
192 const struct sock *sk_from)
194 __inet_sk_copy_descendant(sk_to, sk_from, sizeof(struct inet_sock));
199 extern int inet_sk_rebuild_header(struct sock *sk);
202 #if defined(__LITTLE_ENDIAN_BITFIELD)
205 #elif defined (__BIG_ENDIAN_BITFIELD)
209 #error "Please fix <asm/byteorder.h>"
220 /*The options start here. */
225 __u8 hdrlen; /* This one is measured in 32 bit units! */
228 __u32 seq_no; /* Sequence number */
229 __u8 auth_data[0]; /* Variable len but >=4. Mind the 64 bit alignment! */
234 __u32 seq_no; /* Sequence number */
235 __u8 enc_data[0]; /* Variable len but >=8. Mind the 64 bit alignment! */
244 #endif /* _LINUX_IP_H */