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 /* SOL_IP socket options */
23 #define IPTOS_TOS_MASK 0x1E
24 #define IPTOS_TOS(tos) ((tos)&IPTOS_TOS_MASK)
25 #define IPTOS_LOWDELAY 0x10
26 #define IPTOS_THROUGHPUT 0x08
27 #define IPTOS_RELIABILITY 0x04
28 #define IPTOS_MINCOST 0x02
30 #define IPTOS_PREC_MASK 0xE0
31 #define IPTOS_PREC(tos) ((tos)&IPTOS_PREC_MASK)
32 #define IPTOS_PREC_NETCONTROL 0xe0
33 #define IPTOS_PREC_INTERNETCONTROL 0xc0
34 #define IPTOS_PREC_CRITIC_ECP 0xa0
35 #define IPTOS_PREC_FLASHOVERRIDE 0x80
36 #define IPTOS_PREC_FLASH 0x60
37 #define IPTOS_PREC_IMMEDIATE 0x40
38 #define IPTOS_PREC_PRIORITY 0x20
39 #define IPTOS_PREC_ROUTINE 0x00
43 #define IPOPT_COPY 0x80
44 #define IPOPT_CLASS_MASK 0x60
45 #define IPOPT_NUMBER_MASK 0x1f
47 #define IPOPT_COPIED(o) ((o)&IPOPT_COPY)
48 #define IPOPT_CLASS(o) ((o)&IPOPT_CLASS_MASK)
49 #define IPOPT_NUMBER(o) ((o)&IPOPT_NUMBER_MASK)
51 #define IPOPT_CONTROL 0x00
52 #define IPOPT_RESERVED1 0x20
53 #define IPOPT_MEASUREMENT 0x40
54 #define IPOPT_RESERVED2 0x60
56 #define IPOPT_END (0 |IPOPT_CONTROL)
57 #define IPOPT_NOOP (1 |IPOPT_CONTROL)
58 #define IPOPT_SEC (2 |IPOPT_CONTROL|IPOPT_COPY)
59 #define IPOPT_LSRR (3 |IPOPT_CONTROL|IPOPT_COPY)
60 #define IPOPT_TIMESTAMP (4 |IPOPT_MEASUREMENT)
61 #define IPOPT_RR (7 |IPOPT_CONTROL)
62 #define IPOPT_SID (8 |IPOPT_CONTROL|IPOPT_COPY)
63 #define IPOPT_SSRR (9 |IPOPT_CONTROL|IPOPT_COPY)
64 #define IPOPT_RA (20|IPOPT_CONTROL|IPOPT_COPY)
70 /* struct timestamp, struct route and MAX_ROUTES are removed.
72 REASONS: it is clear that nobody used them because:
73 - MAX_ROUTES value was wrong.
74 - "struct route" was wrong.
75 - "struct timestamp" had fatally misaligned bitfields and was completely unusable.
78 #define IPOPT_OPTVAL 0
80 #define IPOPT_OFFSET 2
81 #define IPOPT_MINOFF 4
82 #define MAX_IPOPTLEN 40
83 #define IPOPT_NOP IPOPT_NOOP
84 #define IPOPT_EOL IPOPT_END
85 #define IPOPT_TS IPOPT_TIMESTAMP
87 #define IPOPT_TS_TSONLY 0 /* timestamps only */
88 #define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */
89 #define IPOPT_TS_PRESPEC 3 /* specified modules only */
94 __u32 faddr
; /* Saved first hop address */
99 unsigned char is_setbyuser
:1, /* Set by setsockopt? */
100 is_data
:1, /* Options in __data, rather than skb */
101 is_strictroute
:1, /* Strict source route */
102 srr_is_hit
:1, /* Packet destination addr was our one */
103 is_changed
:1, /* IP checksum more not valid */
104 rr_needaddr
:1, /* Need to record addr of outgoing dev */
105 ts_needtime
:1, /* Need to record timestamp */
106 ts_needaddr
:1; /* Need to record addr of outgoing dev */
107 unsigned char router_alert
;
108 unsigned char __pad1
;
109 unsigned char __pad2
;
110 unsigned char __data
[0];
113 #define optlength(opt) (sizeof(struct ip_options) + opt->optlen)
117 #if defined(__LITTLE_ENDIAN_BITFIELD)
120 #elif defined (__BIG_ENDIAN_BITFIELD)
124 #error "Please fix <asm/byteorder.h>"
135 /*The options start here. */
138 #endif /* _LINUX_IP_H */