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