/* * 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/types.h>#include <linux/ip.h>#include <linux/in.h>#include <linux/skbuff.h> #include <net/inet_sock.h>#include <net/snmp.h>#include <net/flow.h> struct sock; struct inet_skb_parm {	struct ip_options	opt;		/* Compiled IP options		*/	unsigned char		flags; #define IPSKB_FORWARDED		1#define IPSKB_XFRM_TUNNEL_SIZE	2#define IPSKB_XFRM_TRANSFORMED	4#define IPSKB_FRAG_COMPLETE	8#define IPSKB_REROUTED		16}; static inline unsigned int ip_hdrlen(const struct sk_buff *skb){	return ip_hdr(skb)->ihl * 4;} struct ipcm_cookie {	__be32			addr;	int			oif;	struct ip_options_rcu	*opt;	__u8			tx_flags;}; #define IPCB(skb) ((struct inet_skb_parm*)((skb)->cb)) struct ip_ra_chain {	struct ip_ra_chain __rcu *next;	struct sock		*sk;	union {		void			(*destructor)(struct sock *);		struct sock		*saved_sk;	};	struct rcu_head		rcu;}; extern struct ip_ra_chain __rcu *ip_ra_chain; /* 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	*/ struct msghdr;struct net_device;struct packet_type;struct rtable;struct sockaddr; 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,					      __be32 saddr, __be32 daddr,					      struct ip_options_rcu *opt);extern int		ip_rcv(struct sk_buff *skb, struct net_device *dev,			       struct packet_type *pt, struct net_device *orig_dev);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 (*output)(struct sk_buff *));extern int		ip_do_nat(struct sk_buff *skb);extern void		ip_send_check(struct iphdr *ip);extern int		__ip_local_out(struct sk_buff *skb);extern int		ip_local_out(struct sk_buff *skb);extern int		ip_queue_xmit(struct sk_buff *skb, struct flowi *fl);extern void		ip_init(void);extern int		ip_append_data(struct sock *sk, struct flowi4 *fl4,				       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 flowi4 *fl4, struct page *page,				int offset, size_t size, int flags);extern struct sk_buff  *__ip_make_skb(struct sock *sk,				      struct flowi4 *fl4,				      struct sk_buff_head *queue,				      struct inet_cork *cork);extern int		ip_send_skb(struct sk_buff *skb);extern int		ip_push_pending_frames(struct sock *sk, struct flowi4 *fl4);extern void		ip_flush_pending_frames(struct sock *sk);extern struct sk_buff  *ip_make_skb(struct sock *sk,				    struct flowi4 *fl4,				    int getfrag(void *from, char *to, int offset, int len,						int odd, struct sk_buff *skb),				    void *from, int length, int transhdrlen,				    struct ipcm_cookie *ipc,				    struct rtable **rtp,				    unsigned int flags); static inline struct sk_buff *ip_finish_skb(struct sock *sk, struct flowi4 *fl4){	return __ip_make_skb(sk, fl4, &sk->sk_write_queue, &inet_sk(sk)->cork.base);} /* 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(__be32 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];   	int	    flags;	__wsum 	    csum;	int	    csumoffset; /* u16 offset of csum in iov[0].iov_base */				/* -1 if not needed */ 	int	    bound_dev_if;	u8  	    tos;};  #define IP_REPLY_ARG_NOSRCCHECK 1 static inline __u8 ip_reply_arg_flowi_flags(const struct ip_reply_arg *arg){	return (arg->flags & IP_REPLY_ARG_NOSRCCHECK) ? FLOWI_FLAG_ANYSRC : 0;} void ip_send_reply(struct sock *sk, struct sk_buff *skb, __be32 daddr,		   const struct ip_reply_arg *arg, unsigned int len); struct ipv4_config {	int	log_martians;	int	no_pmtu_disc;}; extern struct ipv4_config ipv4_config;#define IP_INC_STATS(net, field)	SNMP_INC_STATS64((net)->mib.ip_statistics, field)#define IP_INC_STATS_BH(net, field)	SNMP_INC_STATS64_BH((net)->mib.ip_statistics, field)#define IP_ADD_STATS(net, field, val)	SNMP_ADD_STATS64((net)->mib.ip_statistics, field, val)#define IP_ADD_STATS_BH(net, field, val) SNMP_ADD_STATS64_BH((net)->mib.ip_statistics, field, val)#define IP_UPD_PO_STATS(net, field, val) SNMP_UPD_PO_STATS64((net)->mib.ip_statistics, field, val)#define IP_UPD_PO_STATS_BH(net, field, val) SNMP_UPD_PO_STATS64_BH((net)->mib.ip_statistics, field, val)#define NET_INC_STATS(net, field)	SNMP_INC_STATS((net)->mib.net_statistics, field)#define NET_INC_STATS_BH(net, field)	SNMP_INC_STATS_BH((net)->mib.net_statistics, field)#define NET_INC_STATS_USER(net, field) 	SNMP_INC_STATS_USER((net)->mib.net_statistics, field)#define NET_ADD_STATS_BH(net, field, adnd) SNMP_ADD_STATS_BH((net)->mib.net_statistics, field, adnd)#define NET_ADD_STATS_USER(net, field, adnd) SNMP_ADD_STATS_USER((net)->mib.net_statistics, field, adnd) extern unsigned long snmp_fold_field(void __percpu *mib[], int offt);#if BITS_PER_LONG==32extern u64 snmp_fold_field64(void __percpu *mib[], int offt, size_t sync_off);#elsestatic inline u64 snmp_fold_field64(void __percpu *mib[], int offt, size_t syncp_off){	return snmp_fold_field(mib, offt);}#endifextern int snmp_mib_init(void __percpu *ptr[2], size_t mibsize, size_t align);extern void snmp_mib_free(void __percpu *ptr[2]); extern struct local_ports {	seqlock_t	lock;	int		range[2];} sysctl_local_ports;extern void inet_get_local_port_range(int *low, int *high); extern unsigned long *sysctl_local_reserved_ports;static inline int inet_is_reserved_local_port(int port){	return test_bit(port, sysctl_local_reserved_ports);} extern int sysctl_ip_nonlocal_bind; extern struct ctl_path net_core_path[];extern struct ctl_path net_ipv4_ctl_path[]; /* From inetpeer.c */extern int inet_peer_threshold;extern int inet_peer_minttl;extern int inet_peer_maxttl; /* From ip_output.c */extern int sysctl_ip_dynaddr; extern void ipfrag_init(void); extern void ip_static_sysctl_init(void); static inline bool ip_is_fragment(const struct iphdr *iph){	return (iph->frag_off & htons(IP_MF | IP_OFFSET)) != 0;} #ifdef CONFIG_INET#include <net/dst.h> /* 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 = (__force u32)iph->check;	check += (__force u32)htons(0x0100);	iph->check = (__force __sum16)(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_locked(dst, 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)->inet_daddr) ?					htons(inet_sk(sk)->inet_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)->inet_daddr) {			iph->id = htons(inet_sk(sk)->inet_id);			inet_sk(sk)->inet_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(__be32 naddr, char *buf){	__u32 addr=ntohl(naddr);	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(__be32 naddr, const unsigned char *broadcast, char *buf){	__u32 addr;	unsigned char scope = broadcast[5] & 0xF; 	buf[0]  = 0;		/* Reserved */	buf[1]  = 0xff;		/* Multicast QPN */	buf[2]  = 0xff;	buf[3]  = 0xff;	addr    = ntohl(naddr);	buf[4]  = 0xff;	buf[5]  = 0x10 | scope;	/* scope from broadcast address */	buf[6]  = 0x40;		/* IPv4 signature */	buf[7]  = 0x1b;	buf[8]  = broadcast[8];		/* P_Key */	buf[9]  = broadcast[9];	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;} static inline void ip_ipgre_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf){	if ((broadcast[0] | broadcast[1] | broadcast[2] | broadcast[3]) != 0)		memcpy(buf, broadcast, 4);	else		memcpy(buf, &naddr, sizeof(naddr));} #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)->inet_rcv_saddr = inet_sk(sk)->inet_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 static inline int sk_mc_loop(struct sock *sk){	if (!sk)		return 1;	switch (sk->sk_family) {	case AF_INET:		return inet_sk(sk)->mc_loop;#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)	case AF_INET6:		return inet6_sk(sk)->mc_loop;#endif	}	WARN_ON(1);	return 1;} extern int	ip_call_ra_chain(struct sk_buff *skb); /* *	Functions provided by ip_fragment.c */ enum ip_defrag_users {	IP_DEFRAG_LOCAL_DELIVER,	IP_DEFRAG_CALL_RA_CHAIN,	IP_DEFRAG_CONNTRACK_IN,	__IP_DEFRAG_CONNTRACK_IN_END	= IP_DEFRAG_CONNTRACK_IN + USHRT_MAX,	IP_DEFRAG_CONNTRACK_OUT,	__IP_DEFRAG_CONNTRACK_OUT_END	= IP_DEFRAG_CONNTRACK_OUT + USHRT_MAX,	IP_DEFRAG_CONNTRACK_BRIDGE_IN,	__IP_DEFRAG_CONNTRACK_BRIDGE_IN = IP_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX,	IP_DEFRAG_VS_IN,	IP_DEFRAG_VS_OUT,	IP_DEFRAG_VS_FWD,	IP_DEFRAG_AF_PACKET,	IP_DEFRAG_MACVLAN,}; int ip_defrag(struct sk_buff *skb, u32 user);#ifdef CONFIG_INETstruct sk_buff *ip_check_defrag(struct sk_buff *skb, u32 user);#elsestatic inline struct sk_buff *ip_check_defrag(struct sk_buff *skb, u32 user){	return skb;}#endifint ip_frag_mem(struct net *net);int ip_frag_nqueues(struct net *net); /* *	Functions provided by ip_forward.c */ extern int ip_forward(struct sk_buff *skb); /* *	Functions provided by ip_options.c */ extern void ip_options_build(struct sk_buff *skb, struct ip_options *opt,			     __be32 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 net *net,			      struct ip_options *opt, struct sk_buff *skb);extern int ip_options_get(struct net *net, struct ip_options_rcu **optp,			  unsigned char *data, int optlen);extern int ip_options_get_from_user(struct net *net, struct ip_options_rcu **optp,				    unsigned char __user *data, int optlen);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 int	ip_queue_rcv_skb(struct sock *sk, struct sk_buff *skb);extern void	ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb);extern int	ip_cmsg_send(struct net *net,			     struct msghdr *msg, struct ipcm_cookie *ipc);extern int	ip_setsockopt(struct sock *sk, int level, int optname, char __user *optval, unsigned int optlen);extern int	ip_getsockopt(struct sock *sk, int level, int optname, char __user *optval, int __user *optlen);extern int	compat_ip_setsockopt(struct sock *sk, int level,			int optname, char __user *optval, unsigned int optlen);extern int	compat_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, 			      __be16 port, u32 info, u8 *payload);extern void	ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 dport,			       u32 info); #ifdef CONFIG_PROC_FSextern int ip_misc_proc_init(void);#endif #endif	/* _IP_H */