245 lines
6.7 KiB
C
245 lines
6.7 KiB
C
/*
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* INET An implementation of the TCP/IP protocol suite for the LINUX
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* operating system. INET is implemented using the BSD Socket
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* interface as the means of communication with the user level.
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*
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* Definitions for the IP protocol.
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*
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* Version: @(#)ip.h 1.0.2 04/28/93
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*
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* Authors: Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#ifndef _LINUX_IP_H
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#define _LINUX_IP_H
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#include <asm/byteorder.h>
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#define IPTOS_TOS_MASK 0x1E
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#define IPTOS_TOS(tos) ((tos)&IPTOS_TOS_MASK)
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#define IPTOS_LOWDELAY 0x10
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#define IPTOS_THROUGHPUT 0x08
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#define IPTOS_RELIABILITY 0x04
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#define IPTOS_MINCOST 0x02
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#define IPTOS_PREC_MASK 0xE0
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#define IPTOS_PREC(tos) ((tos)&IPTOS_PREC_MASK)
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#define IPTOS_PREC_NETCONTROL 0xe0
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#define IPTOS_PREC_INTERNETCONTROL 0xc0
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#define IPTOS_PREC_CRITIC_ECP 0xa0
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#define IPTOS_PREC_FLASHOVERRIDE 0x80
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#define IPTOS_PREC_FLASH 0x60
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#define IPTOS_PREC_IMMEDIATE 0x40
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#define IPTOS_PREC_PRIORITY 0x20
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#define IPTOS_PREC_ROUTINE 0x00
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/* IP options */
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#define IPOPT_COPY 0x80
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#define IPOPT_CLASS_MASK 0x60
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#define IPOPT_NUMBER_MASK 0x1f
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#define IPOPT_COPIED(o) ((o)&IPOPT_COPY)
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#define IPOPT_CLASS(o) ((o)&IPOPT_CLASS_MASK)
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#define IPOPT_NUMBER(o) ((o)&IPOPT_NUMBER_MASK)
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#define IPOPT_CONTROL 0x00
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#define IPOPT_RESERVED1 0x20
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#define IPOPT_MEASUREMENT 0x40
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#define IPOPT_RESERVED2 0x60
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#define IPOPT_END (0 |IPOPT_CONTROL)
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#define IPOPT_NOOP (1 |IPOPT_CONTROL)
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#define IPOPT_SEC (2 |IPOPT_CONTROL|IPOPT_COPY)
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#define IPOPT_LSRR (3 |IPOPT_CONTROL|IPOPT_COPY)
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#define IPOPT_TIMESTAMP (4 |IPOPT_MEASUREMENT)
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#define IPOPT_RR (7 |IPOPT_CONTROL)
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#define IPOPT_SID (8 |IPOPT_CONTROL|IPOPT_COPY)
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#define IPOPT_SSRR (9 |IPOPT_CONTROL|IPOPT_COPY)
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#define IPOPT_RA (20|IPOPT_CONTROL|IPOPT_COPY)
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#define IPVERSION 4
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#define MAXTTL 255
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#define IPDEFTTL 64
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#define IPOPT_OPTVAL 0
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#define IPOPT_OLEN 1
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#define IPOPT_OFFSET 2
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#define IPOPT_MINOFF 4
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#define MAX_IPOPTLEN 40
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#define IPOPT_NOP IPOPT_NOOP
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#define IPOPT_EOL IPOPT_END
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#define IPOPT_TS IPOPT_TIMESTAMP
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#define IPOPT_TS_TSONLY 0 /* timestamps only */
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#define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */
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#define IPOPT_TS_PRESPEC 3 /* specified modules only */
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#ifdef __KERNEL__
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#include <linux/config.h>
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#include <linux/types.h>
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#include <net/request_sock.h>
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#include <net/sock.h>
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#include <linux/igmp.h>
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#include <net/flow.h>
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struct ip_options {
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__u32 faddr; /* Saved first hop address */
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unsigned char optlen;
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unsigned char srr;
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unsigned char rr;
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unsigned char ts;
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unsigned char is_setbyuser:1, /* Set by setsockopt? */
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is_data:1, /* Options in __data, rather than skb */
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is_strictroute:1, /* Strict source route */
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srr_is_hit:1, /* Packet destination addr was our one */
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is_changed:1, /* IP checksum more not valid */
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rr_needaddr:1, /* Need to record addr of outgoing dev */
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ts_needtime:1, /* Need to record timestamp */
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ts_needaddr:1; /* Need to record addr of outgoing dev */
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unsigned char router_alert;
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unsigned char __pad1;
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unsigned char __pad2;
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unsigned char __data[0];
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};
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#define optlength(opt) (sizeof(struct ip_options) + opt->optlen)
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struct inet_request_sock {
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struct request_sock req;
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u32 loc_addr;
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u32 rmt_addr;
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u16 rmt_port;
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u16 snd_wscale : 4,
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rcv_wscale : 4,
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tstamp_ok : 1,
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sack_ok : 1,
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wscale_ok : 1,
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ecn_ok : 1,
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acked : 1;
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struct ip_options *opt;
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};
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static inline struct inet_request_sock *inet_rsk(const struct request_sock *sk)
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{
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return (struct inet_request_sock *)sk;
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}
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struct ipv6_pinfo;
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struct inet_sock {
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/* sk and pinet6 has to be the first two members of inet_sock */
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struct sock sk;
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#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
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struct ipv6_pinfo *pinet6;
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#endif
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/* Socket demultiplex comparisons on incoming packets. */
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__u32 daddr; /* Foreign IPv4 addr */
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__u32 rcv_saddr; /* Bound local IPv4 addr */
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__u16 dport; /* Destination port */
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__u16 num; /* Local port */
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__u32 saddr; /* Sending source */
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__s16 uc_ttl; /* Unicast TTL */
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__u16 cmsg_flags;
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struct ip_options *opt;
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__u16 sport; /* Source port */
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__u16 id; /* ID counter for DF pkts */
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__u8 tos; /* TOS */
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__u8 mc_ttl; /* Multicasting TTL */
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__u8 pmtudisc;
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unsigned recverr : 1,
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freebind : 1,
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hdrincl : 1,
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mc_loop : 1;
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int mc_index; /* Multicast device index */
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__u32 mc_addr;
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struct ip_mc_socklist *mc_list; /* Group array */
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/*
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* Following members are used to retain the infomation to build
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* an ip header on each ip fragmentation while the socket is corked.
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*/
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struct {
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unsigned int flags;
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unsigned int fragsize;
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struct ip_options *opt;
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struct rtable *rt;
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int length; /* Total length of all frames */
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u32 addr;
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struct flowi fl;
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} cork;
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};
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#define IPCORK_OPT 1 /* ip-options has been held in ipcork.opt */
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#define IPCORK_ALLFRAG 2 /* always fragment (for ipv6 for now) */
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static inline struct inet_sock *inet_sk(const struct sock *sk)
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{
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return (struct inet_sock *)sk;
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}
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static inline void __inet_sk_copy_descendant(struct sock *sk_to,
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const struct sock *sk_from,
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const int ancestor_size)
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{
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memcpy(inet_sk(sk_to) + 1, inet_sk(sk_from) + 1,
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sk_from->sk_prot->obj_size - ancestor_size);
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}
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#if !(defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE))
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static inline void inet_sk_copy_descendant(struct sock *sk_to,
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const struct sock *sk_from)
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{
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__inet_sk_copy_descendant(sk_to, sk_from, sizeof(struct inet_sock));
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}
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#endif
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#endif
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extern int inet_sk_rebuild_header(struct sock *sk);
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struct iphdr {
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#if defined(__LITTLE_ENDIAN_BITFIELD)
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__u8 ihl:4,
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version:4;
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#elif defined (__BIG_ENDIAN_BITFIELD)
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__u8 version:4,
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ihl:4;
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#else
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#error "Please fix <asm/byteorder.h>"
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#endif
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__u8 tos;
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__u16 tot_len;
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__u16 id;
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__u16 frag_off;
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__u8 ttl;
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__u8 protocol;
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__u16 check;
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__u32 saddr;
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__u32 daddr;
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/*The options start here. */
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};
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struct ip_auth_hdr {
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__u8 nexthdr;
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__u8 hdrlen; /* This one is measured in 32 bit units! */
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__u16 reserved;
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__u32 spi;
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__u32 seq_no; /* Sequence number */
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__u8 auth_data[0]; /* Variable len but >=4. Mind the 64 bit alignment! */
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};
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struct ip_esp_hdr {
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__u32 spi;
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__u32 seq_no; /* Sequence number */
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__u8 enc_data[0]; /* Variable len but >=8. Mind the 64 bit alignment! */
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};
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struct ip_comp_hdr {
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__u8 nexthdr;
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__u8 flags;
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__u16 cpi;
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};
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#endif /* _LINUX_IP_H */
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