/* * 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 *		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/in.h>#include <linux/netdevice.h>#include <linux/inetdevice.h>#include <linux/in_route.h>#include <net/route.h>#include <net/arp.h>#include <net/snmp.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#define IPSKB_XFRM_TUNNEL_SIZE	8}; 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		igmp_mc_proc_init(void); /* *	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, int ipfragok);extern void		ip_init(void);extern int		ip_append_data(struct sock *sk,				       int getfrag(void *from, char *to, int offset, int len,						   int odd, struct sk_buff *skb),				void *from, int len, int protolen,				struct ipcm_cookie *ipc,				struct rtable *rt,				unsigned int flags);extern int		ip_generic_getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb);extern ssize_t		ip_append_page(struct sock *sk, struct page *page,				int offset, size_t size, int flags);extern int		ip_push_pending_frames(struct sock *sk);extern void		ip_flush_pending_frames(struct sock *sk); /* datagram.c */extern int		ip4_datagram_connect(struct sock *sk, 					     struct sockaddr *uaddr, int addr_len); /* *	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 kvec iov[1];   	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 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;DECLARE_SNMP_STAT(struct ipstats_mib, ip_statistics);#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)DECLARE_SNMP_STAT(struct linux_mib, net_statistics);#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)#define NET_ADD_STATS_BH(field, adnd)	SNMP_ADD_STATS_BH(net_statistics, field, adnd)#define NET_ADD_STATS_USER(field, adnd)	SNMP_ADD_STATS_USER(net_statistics, field, adnd) extern int sysctl_local_port_range[2];extern int sysctl_ip_default_ttl;extern int sysctl_ip_nonlocal_bind; #ifdef CONFIG_INET/* The function in 2.2 was invalid, producing wrong result for * check=0xFEFF. It was noticed by Arthur Skawina _year_ ago. --ANK(000625) */static inlineint ip_decrease_ttl(struct iphdr *iph){	u32 check = iph->check;	check += htons(0x0100);	iph->check = check + (check>=0xFFFF);	return --iph->ttl;} static inlineint ip_dont_fragment(struct sock *sk, struct dst_entry *dst){	return (inet_sk(sk)->pmtudisc == IP_PMTUDISC_DO ||		(inet_sk(sk)->pmtudisc == IP_PMTUDISC_WANT &&		 !(dst_metric(dst, RTAX_LOCK)&(1<<RTAX_MTU))));} extern void __ip_select_ident(struct iphdr *iph, struct dst_entry *dst, int more); static inline void ip_select_ident(struct iphdr *iph, struct dst_entry *dst, struct sock *sk){	if (iph->frag_off & 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 && inet_sk(sk)->daddr) ?					htons(inet_sk(sk)->id++) : 0;	} else		__ip_select_ident(iph, dst, 0);} static inline void ip_select_ident_more(struct iphdr *iph, struct dst_entry *dst, struct sock *sk, int more){	if (iph->frag_off & htons(IP_DF)) {		if (sk && inet_sk(sk)->daddr) {			iph->id = htons(inet_sk(sk)->id);			inet_sk(sk)->id += 1 + more;		} else			iph->id = 0;	} else		__ip_select_ident(iph, dst, more);} /* *	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;} /* *	Map a multicast IP onto multicast MAC for type IP-over-InfiniBand. *	Leave P_Key as 0 to be filled in by driver. */ static inline void ip_ib_mc_map(u32 addr, char *buf){	buf[0]  = 0;		/* Reserved */	buf[1]  = 0xff;		/* Multicast QPN */	buf[2]  = 0xff;	buf[3]  = 0xff;	addr    = ntohl(addr);	buf[4]  = 0xff;	buf[5]  = 0x12;		/* link local scope */	buf[6]  = 0x40;		/* IPv4 signature */	buf[7]  = 0x1b;	buf[8]  = 0;		/* P_Key */	buf[9]  = 0;	buf[10] = 0;	buf[11] = 0;	buf[12] = 0;	buf[13] = 0;	buf[14] = 0;	buf[15] = 0;	buf[19] = addr & 0xff;	addr  >>= 8;	buf[18] = addr & 0xff;	addr  >>= 8;	buf[17] = addr & 0xff;	addr  >>= 8;	buf[16] = addr & 0x0f;} #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)#include <linux/ipv6.h>#endif static __inline__ void inet_reset_saddr(struct sock *sk){	inet_sk(sk)->rcv_saddr = inet_sk(sk)->saddr = 0;#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)	if (sk->sk_family == PF_INET6) {		struct ipv6_pinfo *np = inet6_sk(sk); 		memset(&np->saddr, 0, sizeof(np->saddr));		memset(&np->rcv_saddr, 0, sizeof(np->rcv_saddr));	}#endif} #endif extern int	ip_call_ra_chain(struct sk_buff *skb); /* *	Functions provided by ip_fragment.o */ enum ip_defrag_users{	IP_DEFRAG_LOCAL_DELIVER,	IP_DEFRAG_CALL_RA_CHAIN,	IP_DEFRAG_CONNTRACK_IN,	IP_DEFRAG_CONNTRACK_OUT,	IP_DEFRAG_NAT_OUT,	IP_DEFRAG_VS_IN,	IP_DEFRAG_VS_OUT,	IP_DEFRAG_VS_FWD}; struct sk_buff *ip_defrag(struct sk_buff *skb, u32 user);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 __user *optval, int optlen);extern int	ip_getsockopt(struct sock *sk, int level, int optname, char __user *optval, int __user *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); /* sysctl helpers - any sysctl which holds a value that ends up being * fed into the routing cache should use these handlers. */int ipv4_doint_and_flush(ctl_table *ctl, int write,			 struct file* filp, void __user *buffer,			 size_t *lenp, loff_t *ppos);int ipv4_doint_and_flush_strategy(ctl_table *table, int __user *name, int nlen,				  void __user *oldval, size_t __user *oldlenp,				  void __user *newval, size_t newlen, 				  void **context); #endif	/* _IP_H */