ip.h
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上传日期:2009-04-28
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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>
- #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
- #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__
- #include <linux/config.h>
- #include <linux/types.h>
- #include <net/request_sock.h>
- #include <net/sock.h>
- #include <linux/igmp.h>
- #include <net/flow.h>
- 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)
- struct inet_request_sock {
- struct request_sock req;
- u32 loc_addr;
- u32 rmt_addr;
- u16 rmt_port;
- u16 snd_wscale : 4,
- rcv_wscale : 4,
- tstamp_ok : 1,
- sack_ok : 1,
- wscale_ok : 1,
- ecn_ok : 1,
- acked : 1;
- struct ip_options *opt;
- };
- static inline struct inet_request_sock *inet_rsk(const struct request_sock *sk)
- {
- return (struct inet_request_sock *)sk;
- }
- struct ipv6_pinfo;
- struct inet_sock {
- /* sk and pinet6 has to be the first two members of inet_sock */
- struct sock sk;
- #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
- struct ipv6_pinfo *pinet6;
- #endif
- /* Socket demultiplex comparisons on incoming packets. */
- __u32 daddr; /* Foreign IPv4 addr */
- __u32 rcv_saddr; /* Bound local IPv4 addr */
- __u16 dport; /* Destination port */
- __u16 num; /* Local port */
- __u32 saddr; /* Sending source */
- __s16 uc_ttl; /* Unicast TTL */
- __u16 cmsg_flags;
- struct ip_options *opt;
- __u16 sport; /* Source port */
- __u16 id; /* ID counter for DF pkts */
- __u8 tos; /* TOS */
- __u8 mc_ttl; /* Multicasting TTL */
- __u8 pmtudisc;
- unsigned recverr : 1,
- freebind : 1,
- hdrincl : 1,
- mc_loop : 1;
- int mc_index; /* Multicast device index */
- __u32 mc_addr;
- struct ip_mc_socklist *mc_list; /* Group array */
- /*
- * Following members are used to retain the infomation to build
- * an ip header on each ip fragmentation while the socket is corked.
- */
- struct {
- unsigned int flags;
- unsigned int fragsize;
- struct ip_options *opt;
- struct rtable *rt;
- int length; /* Total length of all frames */
- u32 addr;
- struct flowi fl;
- } cork;
- };
- #define IPCORK_OPT 1 /* ip-options has been held in ipcork.opt */
- #define IPCORK_ALLFRAG 2 /* always fragment (for ipv6 for now) */
- static inline struct inet_sock *inet_sk(const struct sock *sk)
- {
- return (struct inet_sock *)sk;
- }
- static inline void __inet_sk_copy_descendant(struct sock *sk_to,
- const struct sock *sk_from,
- const int ancestor_size)
- {
- memcpy(inet_sk(sk_to) + 1, inet_sk(sk_from) + 1,
- sk_from->sk_prot->obj_size - ancestor_size);
- }
- #if !(defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE))
- static inline void inet_sk_copy_descendant(struct sock *sk_to,
- const struct sock *sk_from)
- {
- __inet_sk_copy_descendant(sk_to, sk_from, sizeof(struct inet_sock));
- }
- #endif
- #endif
- extern int inet_sk_rebuild_header(struct sock *sk);
- 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. */
- };
- struct ip_auth_hdr {
- __u8 nexthdr;
- __u8 hdrlen; /* This one is measured in 32 bit units! */
- __u16 reserved;
- __u32 spi;
- __u32 seq_no; /* Sequence number */
- __u8 auth_data[0]; /* Variable len but >=4. Mind the 64 bit alignment! */
- };
- struct ip_esp_hdr {
- __u32 spi;
- __u32 seq_no; /* Sequence number */
- __u8 enc_data[0]; /* Variable len but >=8. Mind the 64 bit alignment! */
- };
- struct ip_comp_hdr {
- __u8 nexthdr;
- __u8 flags;
- __u16 cpi;
- };
- #endif /* _LINUX_IP_H */