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phoenix |
/*
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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 module.
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*
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* Version: @(#)ip.h 1.0.2 05/07/93
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*
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* Authors: Ross Biro, <bir7@leland.Stanford.Edu>
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* Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
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* Alan Cox, <gw4pts@gw4pts.ampr.org>
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*
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* Changes:
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* Mike McLagan : Routing by source
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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 _IP_H
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#define _IP_H
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#include <linux/config.h>
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#include <linux/types.h>
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#include <linux/socket.h>
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#include <linux/ip.h>
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#include <linux/netdevice.h>
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#include <linux/inetdevice.h>
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#include <linux/in_route.h>
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#include <net/route.h>
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#include <net/arp.h>
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#ifndef _SNMP_H
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#include <net/snmp.h>
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#endif
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#include <net/sock.h> /* struct sock */
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struct inet_skb_parm
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{
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struct ip_options opt; /* Compiled IP options */
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unsigned char flags;
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#define IPSKB_MASQUERADED 1
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#define IPSKB_TRANSLATED 2
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#define IPSKB_FORWARDED 4
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};
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struct ipcm_cookie
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{
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u32 addr;
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int oif;
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struct ip_options *opt;
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};
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#define IPCB(skb) ((struct inet_skb_parm*)((skb)->cb))
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struct ip_ra_chain
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{
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struct ip_ra_chain *next;
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struct sock *sk;
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void (*destructor)(struct sock *);
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};
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extern struct ip_ra_chain *ip_ra_chain;
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extern rwlock_t ip_ra_lock;
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/* IP flags. */
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#define IP_CE 0x8000 /* Flag: "Congestion" */
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#define IP_DF 0x4000 /* Flag: "Don't Fragment" */
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#define IP_MF 0x2000 /* Flag: "More Fragments" */
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#define IP_OFFSET 0x1FFF /* "Fragment Offset" part */
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#define IP_FRAG_TIME (30 * HZ) /* fragment lifetime */
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extern void ip_mc_dropsocket(struct sock *);
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extern void ip_mc_dropdevice(struct net_device *dev);
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extern int ip_mc_procinfo(char *, char **, off_t, int);
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extern int ip_mcf_procinfo(char *, char **, off_t, int);
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/*
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* Functions provided by ip.c
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*/
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extern int ip_build_and_send_pkt(struct sk_buff *skb, struct sock *sk,
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u32 saddr, u32 daddr,
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struct ip_options *opt);
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extern int ip_rcv(struct sk_buff *skb, struct net_device *dev,
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struct packet_type *pt);
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extern int ip_local_deliver(struct sk_buff *skb);
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extern int ip_mr_input(struct sk_buff *skb);
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extern int ip_output(struct sk_buff *skb);
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extern int ip_mc_output(struct sk_buff *skb);
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extern int ip_fragment(struct sk_buff *skb, int (*out)(struct sk_buff*));
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extern int ip_do_nat(struct sk_buff *skb);
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extern void ip_send_check(struct iphdr *ip);
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extern int ip_queue_xmit(struct sk_buff *skb, int ipfragok);
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extern void ip_init(void);
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extern int ip_build_xmit(struct sock *sk,
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int getfrag (const void *,
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char *,
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unsigned int,
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unsigned int),
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const void *frag,
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unsigned length,
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struct ipcm_cookie *ipc,
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struct rtable *rt,
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int flags);
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/*
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* Map a multicast IP onto multicast MAC for type Token Ring.
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* This conforms to RFC1469 Option 2 Multicasting i.e.
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* using a functional address to transmit / receive
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* multicast packets.
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*/
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static inline void ip_tr_mc_map(u32 addr, char *buf)
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{
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buf[0]=0xC0;
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buf[1]=0x00;
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buf[2]=0x00;
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buf[3]=0x04;
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buf[4]=0x00;
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buf[5]=0x00;
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}
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struct ip_reply_arg {
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struct iovec iov[2];
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int n_iov; /* redundant */
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u32 csum;
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int csumoffset; /* u16 offset of csum in iov[0].iov_base */
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/* -1 if not needed */
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};
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void ip_send_reply(struct sock *sk, struct sk_buff *skb, struct ip_reply_arg *arg,
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unsigned int len);
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extern __inline__ int ip_finish_output(struct sk_buff *skb);
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struct ipv4_config
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{
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int log_martians;
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int autoconfig;
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int no_pmtu_disc;
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};
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extern struct ipv4_config ipv4_config;
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extern struct ip_mib ip_statistics[NR_CPUS*2];
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#define IP_INC_STATS(field) SNMP_INC_STATS(ip_statistics, field)
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#define IP_INC_STATS_BH(field) SNMP_INC_STATS_BH(ip_statistics, field)
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#define IP_INC_STATS_USER(field) SNMP_INC_STATS_USER(ip_statistics, field)
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extern struct linux_mib net_statistics[NR_CPUS*2];
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#define NET_INC_STATS(field) SNMP_INC_STATS(net_statistics, field)
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#define NET_INC_STATS_BH(field) SNMP_INC_STATS_BH(net_statistics, field)
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#define NET_INC_STATS_USER(field) SNMP_INC_STATS_USER(net_statistics, field)
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extern int sysctl_local_port_range[2];
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extern int sysctl_ip_default_ttl;
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#ifdef CONFIG_INET
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static inline int ip_send(struct sk_buff *skb)
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{
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if (skb->len > skb->dst->pmtu)
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return ip_fragment(skb, ip_finish_output);
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else
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return ip_finish_output(skb);
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}
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/* The function in 2.2 was invalid, producing wrong result for
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* check=0xFEFF. It was noticed by Arthur Skawina _year_ ago. --ANK(000625) */
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static inline
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int ip_decrease_ttl(struct iphdr *iph)
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{
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u32 check = iph->check;
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check += __constant_htons(0x0100);
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iph->check = check + (check>=0xFFFF);
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return --iph->ttl;
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}
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static inline
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int ip_dont_fragment(struct sock *sk, struct dst_entry *dst)
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{
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return (sk->protinfo.af_inet.pmtudisc == IP_PMTUDISC_DO ||
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(sk->protinfo.af_inet.pmtudisc == IP_PMTUDISC_WANT &&
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!(dst->mxlock&(1<<RTAX_MTU))));
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}
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extern void __ip_select_ident(struct iphdr *iph, struct dst_entry *dst);
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static inline void ip_select_ident(struct iphdr *iph, struct dst_entry *dst, struct sock *sk)
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{
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if (iph->frag_off&__constant_htons(IP_DF)) {
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/* This is only to work around buggy Windows95/2000
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* VJ compression implementations. If the ID field
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* does not change, they drop every other packet in
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* a TCP stream using header compression.
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*/
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iph->id = ((sk && sk->daddr) ? htons(sk->protinfo.af_inet.id++) : 0);
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} else
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__ip_select_ident(iph, dst);
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}
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/*
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* Map a multicast IP onto multicast MAC for type ethernet.
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*/
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static inline void ip_eth_mc_map(u32 addr, char *buf)
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{
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addr=ntohl(addr);
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buf[0]=0x01;
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buf[1]=0x00;
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buf[2]=0x5e;
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buf[5]=addr&0xFF;
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addr>>=8;
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buf[4]=addr&0xFF;
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addr>>=8;
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buf[3]=addr&0x7F;
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}
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#endif
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extern int ip_call_ra_chain(struct sk_buff *skb);
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/*
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* Functions provided by ip_fragment.o
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*/
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struct sk_buff *ip_defrag(struct sk_buff *skb);
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extern int ip_frag_nqueues;
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extern atomic_t ip_frag_mem;
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/*
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* Functions provided by ip_forward.c
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*/
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extern int ip_forward(struct sk_buff *skb);
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extern int ip_net_unreachable(struct sk_buff *skb);
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/*
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* Functions provided by ip_options.c
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*/
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extern void ip_options_build(struct sk_buff *skb, struct ip_options *opt, u32 daddr, struct rtable *rt, int is_frag);
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extern int ip_options_echo(struct ip_options *dopt, struct sk_buff *skb);
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extern void ip_options_fragment(struct sk_buff *skb);
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extern int ip_options_compile(struct ip_options *opt, struct sk_buff *skb);
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extern int ip_options_get(struct ip_options **optp, unsigned char *data, int optlen, int user);
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extern void ip_options_undo(struct ip_options * opt);
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extern void ip_forward_options(struct sk_buff *skb);
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extern int ip_options_rcv_srr(struct sk_buff *skb);
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/*
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* Functions provided by ip_sockglue.c
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*/
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extern void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb);
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extern int ip_cmsg_send(struct msghdr *msg, struct ipcm_cookie *ipc);
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extern int ip_setsockopt(struct sock *sk, int level, int optname, char *optval, int optlen);
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extern int ip_getsockopt(struct sock *sk, int level, int optname, char *optval, int *optlen);
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extern int ip_ra_control(struct sock *sk, unsigned char on, void (*destructor)(struct sock *));
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extern int ip_recv_error(struct sock *sk, struct msghdr *msg, int len);
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extern void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
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u16 port, u32 info, u8 *payload);
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extern void ip_local_error(struct sock *sk, int err, u32 daddr, u16 dport,
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u32 info);
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#endif /* _IP_H */
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