[mirror_ubuntu-bionic-kernel.git] / include / net / ip.h

/*
 * 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	*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 *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);
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 struct sk_buff  *__ip_make_skb(struct sock *sk,
				      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);
extern void		ip_flush_pending_frames(struct sock *sk);
extern struct sk_buff  *ip_make_skb(struct sock *sk,
				    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)
{
	return __ip_make_skb(sk, &sk->sk_write_queue, &inet_sk(sk)->cork);
}

/* 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;
}; 

#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, 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==32
extern u64 snmp_fold_field64(void __percpu *mib[], int offt, size_t sync_off);
#else
static inline u64 snmp_fold_field64(void __percpu *mib[], int offt, size_t syncp_off)
{
	return snmp_fold_field(mib, offt);
}
#endif
extern 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;
extern int inet_peer_gc_mintime;
extern int inet_peer_gc_maxtime;

/* From ip_output.c */
extern int sysctl_ip_dynaddr;

extern void ipfrag_init(void);

extern void ip_static_sysctl_init(void);

#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 inline
int 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 inline
int 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;
}

#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
};

int ip_defrag(struct sk_buff *skb, u32 user);
int 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 **optp,
			  unsigned char *data, int optlen);
extern int ip_options_get_from_user(struct net *net, struct ip_options **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_FS
extern int ip_misc_proc_init(void);
#endif

#endif	/* _IP_H */
Commit	Line	Data
1da177e4 LT	1	/*
	2	* INET An implementation of the TCP/IP protocol suite for the LINUX
	3	* operating system. INET is implemented using the BSD Socket
	4	* interface as the means of communication with the user level.
	5	*
	6	* Definitions for the IP module.
	7	*
	8	* Version: @(#)ip.h 1.0.2 05/07/93
	9	*
02c30a84	10	* Authors: Ross Biro
1da177e4 LT	11	* Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
	12	* Alan Cox, <gw4pts@gw4pts.ampr.org>
	13	*
	14	* Changes:
	15	* Mike McLagan : Routing by source
	16	*
	17	* This program is free software; you can redistribute it and/or
	18	* modify it under the terms of the GNU General Public License
	19	* as published by the Free Software Foundation; either version
	20	* 2 of the License, or (at your option) any later version.
	21	*/
	22	#ifndef _IP_H
	23	#define _IP_H
	24
1da177e4	25	#include <linux/types.h>
1da177e4 LT	26	#include <linux/ip.h>
1da177e4 LT	27	#include <linux/in.h>
c9bdd4b5	28	#include <linux/skbuff.h>
14c85021 ACM	29
14c85021 ACM	30	#include <net/inet_sock.h>
1da177e4	31	#include <net/snmp.h>
86b08d86	32	#include <net/flow.h>
1da177e4 LT	33
	34	struct sock;
	35
fd2c3ef7	36	struct inet_skb_parm {
1da177e4 LT	37	struct ip_options opt; /* Compiled IP options */
	38	unsigned char flags;
	39
8cdfab8a PM	40	#define IPSKB_FORWARDED 1
8cdfab8a PM	41	#define IPSKB_XFRM_TUNNEL_SIZE 2
3e3850e9 PM	42	#define IPSKB_XFRM_TRANSFORMED 4
3e3850e9 PM	43	#define IPSKB_FRAG_COMPLETE 8
48d5cad8	44	#define IPSKB_REROUTED 16
1da177e4 LT	45	};
1da177e4 LT	46
c9bdd4b5 ACM	47	static inline unsigned int ip_hdrlen(const struct sk_buff *skb)
c9bdd4b5 ACM	48	{
eddc9ec5	49	return ip_hdr(skb)->ihl * 4;
c9bdd4b5 ACM	50	}
c9bdd4b5 ACM	51
fd2c3ef7	52	struct ipcm_cookie {
c1d18f9f	53	__be32 addr;
1da177e4 LT	54	int oif;
1da177e4 LT	55	struct ip_options *opt;
2244d07b	56	__u8 tx_flags;
1da177e4 LT	57	};
	58
	59	#define IPCB(skb) ((struct inet_skb_parm*)((skb)->cb))
	60
fd2c3ef7	61	struct ip_ra_chain {
43a951e9	62	struct ip_ra_chain __rcu *next;
1da177e4	63	struct sock *sk;
592fcb9d ED	64	union {
	65	void (destructor)(struct sock );
	66	struct sock *saved_sk;
	67	};
66018506	68	struct rcu_head rcu;
1da177e4 LT	69	};
1da177e4 LT	70
43a951e9	71	extern struct ip_ra_chain __rcu *ip_ra_chain;
1da177e4 LT	72
	73	/* IP flags. */
	74	#define IP_CE 0x8000 /* Flag: "Congestion" */
	75	#define IP_DF 0x4000 /* Flag: "Don't Fragment" */
	76	#define IP_MF 0x2000 /* Flag: "More Fragments" */
	77	#define IP_OFFSET 0x1FFF /* "Fragment Offset" part */
	78
	79	#define IP_FRAG_TIME (30 * HZ) /* fragment lifetime */
	80
14c85021 ACM	81	struct msghdr;
	82	struct net_device;
	83	struct packet_type;
	84	struct rtable;
14c85021 ACM	85	struct sockaddr;
14c85021 ACM	86
1da177e4 LT	87	extern int igmp_mc_proc_init(void);
	88
	89	/*
	90	* Functions provided by ip.c
	91	*/
	92
	93	extern int ip_build_and_send_pkt(struct sk_buff skb, struct sock sk,
13d8eaa0	94	__be32 saddr, __be32 daddr,
1da177e4 LT	95	struct ip_options *opt);
1da177e4 LT	96	extern int ip_rcv(struct sk_buff skb, struct net_device dev,
f2ccd8fa	97	struct packet_type pt, struct net_device orig_dev);
1da177e4 LT	98	extern int ip_local_deliver(struct sk_buff *skb);
	99	extern int ip_mr_input(struct sk_buff *skb);
	100	extern int ip_output(struct sk_buff *skb);
	101	extern int ip_mc_output(struct sk_buff *skb);
2e2f7aef	102	extern int ip_fragment(struct sk_buff skb, int (output)(struct sk_buff *));
1da177e4 LT	103	extern int ip_do_nat(struct sk_buff *skb);
1da177e4 LT	104	extern void ip_send_check(struct iphdr *ip);
c439cb2e HX	105	extern int __ip_local_out(struct sk_buff *skb);
c439cb2e HX	106	extern int ip_local_out(struct sk_buff *skb);
4e15ed4d	107	extern int ip_queue_xmit(struct sk_buff *skb);
1da177e4 LT	108	extern void ip_init(void);
	109	extern int ip_append_data(struct sock *sk,
	110	int getfrag(void from, char to, int offset, int len,
	111	int odd, struct sk_buff *skb),
	112	void *from, int len, int protolen,
	113	struct ipcm_cookie *ipc,
2e77d89b	114	struct rtable **rt,
1da177e4 LT	115	unsigned int flags);
	116	extern int ip_generic_getfrag(void from, char to, int offset, int len, int odd, struct sk_buff *skb);
	117	extern ssize_t ip_append_page(struct sock sk, struct page page,
	118	int offset, size_t size, int flags);
1c32c5ad HX	119	extern struct sk_buff __ip_make_skb(struct sock sk,
	120	struct sk_buff_head *queue,
	121	struct inet_cork *cork);
	122	extern int ip_send_skb(struct sk_buff *skb);
1da177e4 LT	123	extern int ip_push_pending_frames(struct sock *sk);
1da177e4 LT	124	extern void ip_flush_pending_frames(struct sock *sk);
1c32c5ad HX	125	extern struct sk_buff ip_make_skb(struct sock sk,
	126	int getfrag(void from, char to, int offset, int len,
	127	int odd, struct sk_buff *skb),
	128	void *from, int length, int transhdrlen,
	129	struct ipcm_cookie *ipc,
	130	struct rtable **rtp,
	131	unsigned int flags);
	132
	133	static inline struct sk_buff ip_finish_skb(struct sock sk)
	134	{
	135	return __ip_make_skb(sk, &sk->sk_write_queue, &inet_sk(sk)->cork);
	136	}
1da177e4 LT	137
	138	/* datagram.c */
	139	extern int ip4_datagram_connect(struct sock *sk,
	140	struct sockaddr *uaddr, int addr_len);
	141
	142	/*
	143	* Map a multicast IP onto multicast MAC for type Token Ring.
	144	* This conforms to RFC1469 Option 2 Multicasting i.e.
	145	* using a functional address to transmit / receive
	146	* multicast packets.
	147	*/
	148
714e85be	149	static inline void ip_tr_mc_map(__be32 addr, char *buf)
1da177e4 LT	150	{
	151	buf[0]=0xC0;
	152	buf[1]=0x00;
	153	buf[2]=0x00;
	154	buf[3]=0x04;
	155	buf[4]=0x00;
	156	buf[5]=0x00;
	157	}
	158
	159	struct ip_reply_arg {
	160	struct kvec iov[1];
88ef4a5a	161	int flags;
d6f5493c	162	__wsum csum;
1da177e4 LT	163	int csumoffset; /* u16 offset of csum in iov[0].iov_base */
1da177e4 LT	164	/* -1 if not needed */
f0e48dbf	165	int bound_dev_if;
1da177e4 LT	166	};
1da177e4 LT	167
88ef4a5a KK	168	#define IP_REPLY_ARG_NOSRCCHECK 1
88ef4a5a KK	169
86b08d86 KK	170	static inline __u8 ip_reply_arg_flowi_flags(const struct ip_reply_arg *arg)
	171	{
	172	return (arg->flags & IP_REPLY_ARG_NOSRCCHECK) ? FLOWI_FLAG_ANYSRC : 0;
	173	}
	174
1da177e4 LT	175	void ip_send_reply(struct sock sk, struct sk_buff skb, struct ip_reply_arg *arg,
	176	unsigned int len);
	177
fd2c3ef7	178	struct ipv4_config {
1da177e4	179	int log_martians;
1da177e4 LT	180	int no_pmtu_disc;
	181	};
	182
	183	extern struct ipv4_config ipv4_config;
4ce3c183 ED	184	#define IP_INC_STATS(net, field) SNMP_INC_STATS64((net)->mib.ip_statistics, field)
	185	#define IP_INC_STATS_BH(net, field) SNMP_INC_STATS64_BH((net)->mib.ip_statistics, field)
	186	#define IP_ADD_STATS(net, field, val) SNMP_ADD_STATS64((net)->mib.ip_statistics, field, val)
	187	#define IP_ADD_STATS_BH(net, field, val) SNMP_ADD_STATS64_BH((net)->mib.ip_statistics, field, val)
	188	#define IP_UPD_PO_STATS(net, field, val) SNMP_UPD_PO_STATS64((net)->mib.ip_statistics, field, val)
	189	#define IP_UPD_PO_STATS_BH(net, field, val) SNMP_UPD_PO_STATS64_BH((net)->mib.ip_statistics, field, val)
61a7e260 PE	190	#define NET_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.net_statistics, field)
	191	#define NET_INC_STATS_BH(net, field) SNMP_INC_STATS_BH((net)->mib.net_statistics, field)
	192	#define NET_INC_STATS_USER(net, field) SNMP_INC_STATS_USER((net)->mib.net_statistics, field)
	193	#define NET_ADD_STATS_BH(net, field, adnd) SNMP_ADD_STATS_BH((net)->mib.net_statistics, field, adnd)
	194	#define NET_ADD_STATS_USER(net, field, adnd) SNMP_ADD_STATS_USER((net)->mib.net_statistics, field, adnd)
1da177e4	195
7d720c3e	196	extern unsigned long snmp_fold_field(void __percpu *mib[], int offt);
4ce3c183 ED	197	#if BITS_PER_LONG==32
	198	extern u64 snmp_fold_field64(void __percpu *mib[], int offt, size_t sync_off);
	199	#else
	200	static inline u64 snmp_fold_field64(void __percpu *mib[], int offt, size_t syncp_off)
	201	{
	202	return snmp_fold_field(mib, offt);
	203	}
	204	#endif
1823e4c8	205	extern int snmp_mib_init(void __percpu *ptr[2], size_t mibsize, size_t align);
7d720c3e	206	extern void snmp_mib_free(void __percpu *ptr[2]);
33490170	207
3c689b73 ED	208	extern struct local_ports {
	209	seqlock_t lock;
	210	int range[2];
	211	} sysctl_local_ports;
227b60f5 SH	212	extern void inet_get_local_port_range(int low, int high);
227b60f5 SH	213
e3826f1e AW	214	extern unsigned long *sysctl_local_reserved_ports;
	215	static inline int inet_is_reserved_local_port(int port)
	216	{
	217	return test_bit(port, sysctl_local_reserved_ports);
	218	}
	219
cdac4e07	220	extern int sysctl_ip_nonlocal_bind;
1da177e4	221
b27aeadb	222	extern struct ctl_path net_core_path[];
3d7cc2ba PE	223	extern struct ctl_path net_ipv4_ctl_path[];
3d7cc2ba PE	224
20380731 ACM	225	/* From inetpeer.c */
	226	extern int inet_peer_threshold;
	227	extern int inet_peer_minttl;
	228	extern int inet_peer_maxttl;
	229	extern int inet_peer_gc_mintime;
	230	extern int inet_peer_gc_maxtime;
	231
	232	/* From ip_output.c */
	233	extern int sysctl_ip_dynaddr;
	234
	235	extern void ipfrag_init(void);
	236
bd7b1533 AV	237	extern void ip_static_sysctl_init(void);
bd7b1533 AV	238
1da177e4	239	#ifdef CONFIG_INET
14c85021 ACM	240	#include <net/dst.h>
14c85021 ACM	241
1da177e4 LT	242	/* The function in 2.2 was invalid, producing wrong result for
	243	* check=0xFEFF. It was noticed by Arthur Skawina _year_ ago. --ANK(000625) */
	244	static inline
	245	int ip_decrease_ttl(struct iphdr *iph)
	246	{
5c78f275 AV	247	u32 check = (__force u32)iph->check;
	248	check += (__force u32)htons(0x0100);
	249	iph->check = (__force __sum16)(check + (check>=0xFFFF));
1da177e4 LT	250	return --iph->ttl;
	251	}
	252
	253	static inline
	254	int ip_dont_fragment(struct sock sk, struct dst_entry dst)
	255	{
a02cec21	256	return inet_sk(sk)->pmtudisc == IP_PMTUDISC_DO \|\|
1da177e4	257	(inet_sk(sk)->pmtudisc == IP_PMTUDISC_WANT &&
a02cec21	258	!(dst_metric_locked(dst, RTAX_MTU)));
1da177e4 LT	259	}
	260
	261	extern void __ip_select_ident(struct iphdr iph, struct dst_entry dst, int more);
	262
	263	static inline void ip_select_ident(struct iphdr iph, struct dst_entry dst, struct sock *sk)
	264	{
	265	if (iph->frag_off & htons(IP_DF)) {
	266	/* This is only to work around buggy Windows95/2000
	267	* VJ compression implementations. If the ID field
	268	* does not change, they drop every other packet in
	269	* a TCP stream using header compression.
	270	*/
c720c7e8 ED	271	iph->id = (sk && inet_sk(sk)->inet_daddr) ?
c720c7e8 ED	272	htons(inet_sk(sk)->inet_id++) : 0;
1da177e4 LT	273	} else
	274	__ip_select_ident(iph, dst, 0);
	275	}
	276
	277	static inline void ip_select_ident_more(struct iphdr iph, struct dst_entry dst, struct sock *sk, int more)
	278	{
	279	if (iph->frag_off & htons(IP_DF)) {
c720c7e8 ED	280	if (sk && inet_sk(sk)->inet_daddr) {
	281	iph->id = htons(inet_sk(sk)->inet_id);
	282	inet_sk(sk)->inet_id += 1 + more;
1da177e4 LT	283	} else
	284	iph->id = 0;
	285	} else
	286	__ip_select_ident(iph, dst, more);
	287	}
	288
	289	/*
	290	* Map a multicast IP onto multicast MAC for type ethernet.
	291	*/
	292
714e85be	293	static inline void ip_eth_mc_map(__be32 naddr, char *buf)
1da177e4	294	{
714e85be	295	__u32 addr=ntohl(naddr);
1da177e4 LT	296	buf[0]=0x01;
	297	buf[1]=0x00;
	298	buf[2]=0x5e;
	299	buf[5]=addr&0xFF;
	300	addr>>=8;
	301	buf[4]=addr&0xFF;
	302	addr>>=8;
	303	buf[3]=addr&0x7F;
	304	}
	305
	306	/*
	307	* Map a multicast IP onto multicast MAC for type IP-over-InfiniBand.
	308	* Leave P_Key as 0 to be filled in by driver.
	309	*/
	310
a9e527e3	311	static inline void ip_ib_mc_map(__be32 naddr, const unsigned char broadcast, char buf)
1da177e4	312	{
714e85be	313	__u32 addr;
a9e527e3 RM	314	unsigned char scope = broadcast[5] & 0xF;
a9e527e3 RM	315
1da177e4 LT	316	buf[0] = 0; /* Reserved */
	317	buf[1] = 0xff; /* Multicast QPN */
	318	buf[2] = 0xff;
	319	buf[3] = 0xff;
714e85be	320	addr = ntohl(naddr);
1da177e4	321	buf[4] = 0xff;
a9e527e3	322	buf[5] = 0x10 \| scope; /* scope from broadcast address */
1da177e4 LT	323	buf[6] = 0x40; /* IPv4 signature */
1da177e4 LT	324	buf[7] = 0x1b;
a9e527e3 RM	325	buf[8] = broadcast[8]; /* P_Key */
a9e527e3 RM	326	buf[9] = broadcast[9];
1da177e4 LT	327	buf[10] = 0;
	328	buf[11] = 0;
	329	buf[12] = 0;
	330	buf[13] = 0;
	331	buf[14] = 0;
	332	buf[15] = 0;
	333	buf[19] = addr & 0xff;
	334	addr >>= 8;
	335	buf[18] = addr & 0xff;
	336	addr >>= 8;
	337	buf[17] = addr & 0xff;
	338	addr >>= 8;
	339	buf[16] = addr & 0x0f;
	340	}
	341
	342	#if defined(CONFIG_IPV6) \|\| defined(CONFIG_IPV6_MODULE)
	343	#include <linux/ipv6.h>
	344	#endif
	345
	346	static __inline__ void inet_reset_saddr(struct sock *sk)
	347	{
c720c7e8	348	inet_sk(sk)->inet_rcv_saddr = inet_sk(sk)->inet_saddr = 0;
1da177e4 LT	349	#if defined(CONFIG_IPV6) \|\| defined(CONFIG_IPV6_MODULE)
	350	if (sk->sk_family == PF_INET6) {
	351	struct ipv6_pinfo *np = inet6_sk(sk);
	352
	353	memset(&np->saddr, 0, sizeof(np->saddr));
	354	memset(&np->rcv_saddr, 0, sizeof(np->rcv_saddr));
	355	}
	356	#endif
	357	}
	358
	359	#endif
	360
7ad6848c OP	361	static inline int sk_mc_loop(struct sock *sk)
	362	{
	363	if (!sk)
	364	return 1;
	365	switch (sk->sk_family) {
	366	case AF_INET:
	367	return inet_sk(sk)->mc_loop;
	368	#if defined(CONFIG_IPV6) \|\| defined(CONFIG_IPV6_MODULE)
	369	case AF_INET6:
	370	return inet6_sk(sk)->mc_loop;
	371	#endif
	372	}
cd65c3c7	373	WARN_ON(1);
7ad6848c OP	374	return 1;
	375	}
	376
1da177e4 LT	377	extern int ip_call_ra_chain(struct sk_buff *skb);
	378
	379	/*
b798232f	380	* Functions provided by ip_fragment.c
1da177e4 LT	381	*/
1da177e4 LT	382
fd2c3ef7	383	enum ip_defrag_users {
1da177e4 LT	384	IP_DEFRAG_LOCAL_DELIVER,
	385	IP_DEFRAG_CALL_RA_CHAIN,
	386	IP_DEFRAG_CONNTRACK_IN,
4be929be	387	__IP_DEFRAG_CONNTRACK_IN_END = IP_DEFRAG_CONNTRACK_IN + USHRT_MAX,
1da177e4	388	IP_DEFRAG_CONNTRACK_OUT,
4be929be	389	__IP_DEFRAG_CONNTRACK_OUT_END = IP_DEFRAG_CONNTRACK_OUT + USHRT_MAX,
8fa9ff68	390	IP_DEFRAG_CONNTRACK_BRIDGE_IN,
4be929be	391	__IP_DEFRAG_CONNTRACK_BRIDGE_IN = IP_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX,
1da177e4 LT	392	IP_DEFRAG_VS_IN,
	393	IP_DEFRAG_VS_OUT,
	394	IP_DEFRAG_VS_FWD
	395	};
	396
776c729e	397	int ip_defrag(struct sk_buff *skb, u32 user);
6ddc0822	398	int ip_frag_mem(struct net *net);
e5a2bb84	399	int ip_frag_nqueues(struct net *net);
1da177e4 LT	400
	401	/*
	402	* Functions provided by ip_forward.c
	403	*/
	404
	405	extern int ip_forward(struct sk_buff *skb);
1da177e4 LT	406
	407	/*
	408	* Functions provided by ip_options.c
	409	*/
	410
8712f774	411	extern void ip_options_build(struct sk_buff skb, struct ip_options opt, __be32 daddr, struct rtable *rt, int is_frag);
1da177e4 LT	412	extern int ip_options_echo(struct ip_options dopt, struct sk_buff skb);
1da177e4 LT	413	extern void ip_options_fragment(struct sk_buff *skb);
0e6bd4a1 DL	414	extern int ip_options_compile(struct net *net,
0e6bd4a1 DL	415	struct ip_options opt, struct sk_buff skb);
f2c4802b	416	extern int ip_options_get(struct net net, struct ip_options *optp,
4c6ea29d	417	unsigned char *data, int optlen);
f2c4802b	418	extern int ip_options_get_from_user(struct net net, struct ip_options *optp,
4c6ea29d	419	unsigned char __user *data, int optlen);
1da177e4 LT	420	extern void ip_options_undo(struct ip_options * opt);
	421	extern void ip_forward_options(struct sk_buff *skb);
	422	extern int ip_options_rcv_srr(struct sk_buff *skb);
	423
	424	/*
	425	* Functions provided by ip_sockglue.c
	426	*/
	427
f84af32c	428	extern int ip_queue_rcv_skb(struct sock sk, struct sk_buff skb);
1da177e4	429	extern void ip_cmsg_recv(struct msghdr msg, struct sk_buff skb);
7a6adb92 DL	430	extern int ip_cmsg_send(struct net *net,
7a6adb92 DL	431	struct msghdr msg, struct ipcm_cookie ipc);
b7058842	432	extern int ip_setsockopt(struct sock sk, int level, int optname, char __user optval, unsigned int optlen);
1da177e4	433	extern int ip_getsockopt(struct sock sk, int level, int optname, char __user optval, int __user *optlen);
3fdadf7d	434	extern int compat_ip_setsockopt(struct sock *sk, int level,
b7058842	435	int optname, char __user *optval, unsigned int optlen);
3fdadf7d DM	436	extern int compat_ip_getsockopt(struct sock *sk, int level,
3fdadf7d DM	437	int optname, char __user optval, int __user optlen);
1da177e4 LT	438	extern int ip_ra_control(struct sock sk, unsigned char on, void (destructor)(struct sock *));
	439
	440	extern int ip_recv_error(struct sock sk, struct msghdr msg, int len);
	441	extern void ip_icmp_error(struct sock sk, struct sk_buff skb, int err,
35986b32	442	__be16 port, u32 info, u8 *payload);
0579016e	443	extern void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 dport,
1da177e4 LT	444	u32 info);
1da177e4 LT	445
20380731 ACM	446	#ifdef CONFIG_PROC_FS
	447	extern int ip_misc_proc_init(void);
	448	#endif
	449
1da177e4	450	#endif /* _IP_H */