include/net/ip.h - kernel/msm-4.9 - Gitiles

 /*
  * 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 net *net, 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);

 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_unicast_reply(struct net *net, struct sk_buff *skb, __be32 daddr,
 			   __be32 saddr, 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==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;

 /* From inetpeer.c */
 extern int inet_peer_threshold;
 extern int inet_peer_minttl;
 extern int inet_peer_maxttl;

 /* From ip_input.c */
 extern int sysctl_ip_early_demux;

 /* 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 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;
 }

 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 IS_ENABLED(CONFIG_IPV6)
 #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 IS_ENABLED(CONFIG_IPV6)
 	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 IS_ENABLED(CONFIG_IPV6)
 	case AF_INET6:
 		return inet6_sk(sk)->mc_loop;
 #endif
 	}
 	WARN_ON(1);
 	return 1;
 }

 extern bool 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_INET
 struct sk_buff *ip_check_defrag(struct sk_buff *skb, u32 user);
 #else
 static inline struct sk_buff *ip_check_defrag(struct sk_buff *skb, u32 user)
 {
 	return skb;
 }
 #endif
 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_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 void	ipv4_pktinfo_prepare(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 */
	/*
	* 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 net net, 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);

	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_unicast_reply(struct net net, struct sk_buff skb, __be32 daddr,
	__be32 saddr, 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==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;

	/* From inetpeer.c */
	extern int inet_peer_threshold;
	extern int inet_peer_minttl;
	extern int inet_peer_maxttl;

	/* From ip_input.c */
	extern int sysctl_ip_early_demux;

	/* 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 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;
	}

	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 IS_ENABLED(CONFIG_IPV6)
	#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 IS_ENABLED(CONFIG_IPV6)
	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 IS_ENABLED(CONFIG_IPV6)
	case AF_INET6:
	return inet6_sk(sk)->mc_loop;
	#endif
	}
	WARN_ON(1);
	return 1;
	}

	extern bool 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_INET
	struct sk_buff ip_check_defrag(struct sk_buff skb, u32 user);
	#else
	static inline struct sk_buff ip_check_defrag(struct sk_buff skb, u32 user)
	{
	return skb;
	}
	#endif
	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_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 void ipv4_pktinfo_prepare(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 */