ip.h
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上传日期:2013-02-24
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- /*
- * INET An implementation of the TCP/IP protocol suite for the LINUX
- * operating system. INET is implemented using the BSD Socket
- * interface as the means of communication with the user level.
- *
- * Definitions for the IP protocol.
- *
- * Version: @(#)ip.h 1.0.2 04/28/93
- *
- * Authors: Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
- */
- #ifndef _LINUX_IP_H
- #define _LINUX_IP_H
- #include <asm/byteorder.h>
- /* SOL_IP socket options */
- #define IPTOS_TOS_MASK 0x1E
- #define IPTOS_TOS(tos) ((tos)&IPTOS_TOS_MASK)
- #define IPTOS_LOWDELAY 0x10
- #define IPTOS_THROUGHPUT 0x08
- #define IPTOS_RELIABILITY 0x04
- #define IPTOS_MINCOST 0x02
- #define IPTOS_PREC_MASK 0xE0
- #define IPTOS_PREC(tos) ((tos)&IPTOS_PREC_MASK)
- #define IPTOS_PREC_NETCONTROL 0xe0
- #define IPTOS_PREC_INTERNETCONTROL 0xc0
- #define IPTOS_PREC_CRITIC_ECP 0xa0
- #define IPTOS_PREC_FLASHOVERRIDE 0x80
- #define IPTOS_PREC_FLASH 0x60
- #define IPTOS_PREC_IMMEDIATE 0x40
- #define IPTOS_PREC_PRIORITY 0x20
- #define IPTOS_PREC_ROUTINE 0x00
- /* IP options */
- #define IPOPT_COPY 0x80
- #define IPOPT_CLASS_MASK 0x60
- #define IPOPT_NUMBER_MASK 0x1f
- #define IPOPT_COPIED(o) ((o)&IPOPT_COPY)
- #define IPOPT_CLASS(o) ((o)&IPOPT_CLASS_MASK)
- #define IPOPT_NUMBER(o) ((o)&IPOPT_NUMBER_MASK)
- #define IPOPT_CONTROL 0x00
- #define IPOPT_RESERVED1 0x20
- #define IPOPT_MEASUREMENT 0x40
- #define IPOPT_RESERVED2 0x60
- #define IPOPT_END (0 |IPOPT_CONTROL)
- #define IPOPT_NOOP (1 |IPOPT_CONTROL)
- #define IPOPT_SEC (2 |IPOPT_CONTROL|IPOPT_COPY)
- #define IPOPT_LSRR (3 |IPOPT_CONTROL|IPOPT_COPY)
- #define IPOPT_TIMESTAMP (4 |IPOPT_MEASUREMENT)
- #define IPOPT_RR (7 |IPOPT_CONTROL)
- #define IPOPT_SID (8 |IPOPT_CONTROL|IPOPT_COPY)
- #define IPOPT_SSRR (9 |IPOPT_CONTROL|IPOPT_COPY)
- #define IPOPT_RA (20|IPOPT_CONTROL|IPOPT_COPY)
- #define IPVERSION 4
- #define MAXTTL 255
- #define IPDEFTTL 64
- /* struct timestamp, struct route and MAX_ROUTES are removed.
- REASONS: it is clear that nobody used them because:
- - MAX_ROUTES value was wrong.
- - "struct route" was wrong.
- - "struct timestamp" had fatally misaligned bitfields and was completely unusable.
- */
- #define IPOPT_OPTVAL 0
- #define IPOPT_OLEN 1
- #define IPOPT_OFFSET 2
- #define IPOPT_MINOFF 4
- #define MAX_IPOPTLEN 40
- #define IPOPT_NOP IPOPT_NOOP
- #define IPOPT_EOL IPOPT_END
- #define IPOPT_TS IPOPT_TIMESTAMP
- #define IPOPT_TS_TSONLY 0 /* timestamps only */
- #define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */
- #define IPOPT_TS_PRESPEC 3 /* specified modules only */
- #ifdef __KERNEL__
- struct ip_options {
- __u32 faddr; /* Saved first hop address */
- unsigned char optlen;
- unsigned char srr;
- unsigned char rr;
- unsigned char ts;
- unsigned char is_setbyuser:1, /* Set by setsockopt? */
- is_data:1, /* Options in __data, rather than skb */
- is_strictroute:1, /* Strict source route */
- srr_is_hit:1, /* Packet destination addr was our one */
- is_changed:1, /* IP checksum more not valid */
- rr_needaddr:1, /* Need to record addr of outgoing dev */
- ts_needtime:1, /* Need to record timestamp */
- ts_needaddr:1; /* Need to record addr of outgoing dev */
- unsigned char router_alert;
- unsigned char __pad1;
- unsigned char __pad2;
- unsigned char __data[0];
- };
- #define optlength(opt) (sizeof(struct ip_options) + opt->optlen)
- #endif
- struct iphdr {
- #if defined(__LITTLE_ENDIAN_BITFIELD)
- __u8 ihl:4,
- version:4;
- #elif defined (__BIG_ENDIAN_BITFIELD)
- __u8 version:4,
- ihl:4;
- #else
- #error "Please fix <asm/byteorder.h>"
- #endif
- __u8 tos;
- __u16 tot_len;
- __u16 id;
- __u16 frag_off;
- __u8 ttl;
- __u8 protocol;
- __u16 check;
- __u32 saddr;
- __u32 daddr;
- /*The options start here. */
- };
- #endif /* _LINUX_IP_H */