/* IP Virtual Server
   * data structure and functionality definitions

   */

  #ifndef _NET_IP_VS_H
  #define _NET_IP_VS_H

  #include <linux/ip_vs.h>                /* definitions shared with userland */

  #include <asm/types.h>                  /* for __uXX types */

  #include <linux/list.h>                 /* for struct list_head */
  #include <linux/spinlock.h>             /* for struct rwlock_t */

  #include <linux/atomic.h>               /* for struct atomic_t */

  #include <linux/compiler.h>

  #include <linux/timer.h>

  #include <linux/bug.h>

  #include <net/checksum.h>

  #include <linux/netfilter.h>		/* for union nf_inet_addr */

  #include <linux/ip.h>

  #include <linux/ipv6.h>			/* for struct ipv6hdr */

  #include <net/ipv6.h>

  #if IS_ENABLED(CONFIG_IP_VS_IPV6)

  #include <linux/netfilter_ipv6/ip6_tables.h>
  #endif

  #if IS_ENABLED(CONFIG_NF_CONNTRACK)

  #include <net/netfilter/nf_conntrack.h>
  #endif

  #include <net/net_namespace.h>		/* Netw namespace */

  #define IP_VS_HDR_INVERSE	1
  #define IP_VS_HDR_ICMP		2

  /* Generic access of ipvs struct */

  static inline struct netns_ipvs *net_ipvs(struct net* net)
  {
  	return net->ipvs;
  }

  /* This one needed for single_open_net since net is stored directly in

   * private not as a struct i.e. seq_file_net can't be used.

   */
  static inline struct net *seq_file_single_net(struct seq_file *seq)
  {
  #ifdef CONFIG_NET_NS
  	return (struct net *)seq->private;
  #else
  	return &init_net;
  #endif
  }

  
  /* Connections' size value needed by ip_vs_ctl.c */
  extern int ip_vs_conn_tab_size;

  struct ip_vs_iphdr {

  	int hdr_flags;	/* ipvs flags */

  	__u32 off;	/* Where IP or IPv4 header starts */

  	__u32 len;	/* IPv4 simply where L4 starts

  			 * IPv6 where L4 Transport Header starts */

  	__u16 fragoffs; /* IPv6 fragment offset, 0 if first frag (or not frag)*/
  	__s16 protocol;
  	__s32 flags;

  	union nf_inet_addr saddr;
  	union nf_inet_addr daddr;
  };

  static inline void *frag_safe_skb_hp(const struct sk_buff *skb, int offset,
  				      int len, void *buffer,
  				      const struct ip_vs_iphdr *ipvsh)
  {
  	return skb_header_pointer(skb, offset, len, buffer);
  }

  /* This function handles filling *ip_vs_iphdr, both for IPv4 and IPv6.
   * IPv6 requires some extra work, as finding proper header position,
   * depend on the IPv6 extension headers.
   */

  static inline int
  ip_vs_fill_iph_skb_off(int af, const struct sk_buff *skb, int offset,

  		       int hdr_flags, struct ip_vs_iphdr *iphdr)

  {

  	iphdr->hdr_flags = hdr_flags;

  	iphdr->off = offset;

  #ifdef CONFIG_IP_VS_IPV6
  	if (af == AF_INET6) {

  		struct ipv6hdr _iph;
  		const struct ipv6hdr *iph = skb_header_pointer(
  			skb, offset, sizeof(_iph), &_iph);
  		if (!iph)
  			return 0;

  		iphdr->saddr.in6 = iph->saddr;
  		iphdr->daddr.in6 = iph->daddr;

  		/* ipv6_find_hdr() updates len, flags */

  		iphdr->len	 = offset;

  		iphdr->flags	 = 0;
  		iphdr->protocol  = ipv6_find_hdr(skb, &iphdr->len, -1,
  						 &iphdr->fragoffs,
  						 &iphdr->flags);

  		if (iphdr->protocol < 0)
  			return 0;

  	} else
  #endif
  	{

  		struct iphdr _iph;
  		const struct iphdr *iph = skb_header_pointer(
  			skb, offset, sizeof(_iph), &_iph);
  		if (!iph)
  			return 0;
  
  		iphdr->len	= offset + iph->ihl * 4;

  		iphdr->fragoffs	= 0;
  		iphdr->protocol	= iph->protocol;
  		iphdr->saddr.ip	= iph->saddr;
  		iphdr->daddr.ip	= iph->daddr;
  	}

  
  	return 1;
  }
  
  static inline int

  ip_vs_fill_iph_skb_icmp(int af, const struct sk_buff *skb, int offset,
  			bool inverse, struct ip_vs_iphdr *iphdr)
  {
  	int hdr_flags = IP_VS_HDR_ICMP;
  
  	if (inverse)
  		hdr_flags |= IP_VS_HDR_INVERSE;
  
  	return ip_vs_fill_iph_skb_off(af, skb, offset, hdr_flags, iphdr);
  }
  
  static inline int
  ip_vs_fill_iph_skb(int af, const struct sk_buff *skb, bool inverse,
  		   struct ip_vs_iphdr *iphdr)
  {
  	int hdr_flags = 0;
  
  	if (inverse)
  		hdr_flags |= IP_VS_HDR_INVERSE;
  
  	return ip_vs_fill_iph_skb_off(af, skb, skb_network_offset(skb),
  				      hdr_flags, iphdr);
  }
  
  static inline bool
  ip_vs_iph_inverse(const struct ip_vs_iphdr *iph)
  {
  	return !!(iph->hdr_flags & IP_VS_HDR_INVERSE);
  }
  
  static inline bool
  ip_vs_iph_icmp(const struct ip_vs_iphdr *iph)

  {

  	return !!(iph->hdr_flags & IP_VS_HDR_ICMP);

  }

  static inline void ip_vs_addr_copy(int af, union nf_inet_addr *dst,
  				   const union nf_inet_addr *src)
  {
  #ifdef CONFIG_IP_VS_IPV6
  	if (af == AF_INET6)

  		dst->in6 = src->in6;

  	else
  #endif
  	dst->ip = src->ip;
  }

  static inline void ip_vs_addr_set(int af, union nf_inet_addr *dst,
  				  const union nf_inet_addr *src)
  {
  #ifdef CONFIG_IP_VS_IPV6
  	if (af == AF_INET6) {
  		dst->in6 = src->in6;
  		return;
  	}
  #endif
  	dst->ip = src->ip;
  	dst->all[1] = 0;
  	dst->all[2] = 0;
  	dst->all[3] = 0;
  }

  static inline int ip_vs_addr_equal(int af, const union nf_inet_addr *a,
  				   const union nf_inet_addr *b)
  {
  #ifdef CONFIG_IP_VS_IPV6
  	if (af == AF_INET6)
  		return ipv6_addr_equal(&a->in6, &b->in6);
  #endif
  	return a->ip == b->ip;
  }

  #ifdef CONFIG_IP_VS_DEBUG

  #include <linux/net.h>

  int ip_vs_get_debug_level(void);

  
  static inline const char *ip_vs_dbg_addr(int af, char *buf, size_t buf_len,
  					 const union nf_inet_addr *addr,
  					 int *idx)
  {
  	int len;
  #ifdef CONFIG_IP_VS_IPV6
  	if (af == AF_INET6)

  		len = snprintf(&buf[*idx], buf_len - *idx, "[%pI6c]",

  			       &addr->in6) + 1;

  	else
  #endif

  		len = snprintf(&buf[*idx], buf_len - *idx, "%pI4",
  			       &addr->ip) + 1;

  
  	*idx += len;
  	BUG_ON(*idx > buf_len + 1);
  	return &buf[*idx - len];
  }

  #define IP_VS_DBG_BUF(level, msg, ...)					\
  	do {								\
  		char ip_vs_dbg_buf[160];				\
  		int ip_vs_dbg_idx = 0;					\
  		if (level <= ip_vs_get_debug_level())			\
  			printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__);	\
  	} while (0)
  #define IP_VS_ERR_BUF(msg...)						\
  	do {								\
  		char ip_vs_dbg_buf[160];				\
  		int ip_vs_dbg_idx = 0;					\
  		pr_err(msg);						\
  	} while (0)

  
  /* Only use from within IP_VS_DBG_BUF() or IP_VS_ERR_BUF macros */

  #define IP_VS_DBG_ADDR(af, addr)					\
  	ip_vs_dbg_addr(af, ip_vs_dbg_buf,				\
  		       sizeof(ip_vs_dbg_buf), addr,			\
  		       &ip_vs_dbg_idx)
  
  #define IP_VS_DBG(level, msg, ...)					\
  	do {								\
  		if (level <= ip_vs_get_debug_level())			\
  			printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__);	\
  	} while (0)
  #define IP_VS_DBG_RL(msg, ...)						\
  	do {								\
  		if (net_ratelimit())					\
  			printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__);	\
  	} while (0)

  #define IP_VS_DBG_PKT(level, af, pp, skb, ofs, msg)			\

  	do {								\
  		if (level <= ip_vs_get_debug_level())			\

  			pp->debug_packet(af, pp, skb, ofs, msg);	\

  	} while (0)

  #define IP_VS_DBG_RL_PKT(level, af, pp, skb, ofs, msg)			\

  	do {								\
  		if (level <= ip_vs_get_debug_level() &&			\
  		    net_ratelimit())					\

  			pp->debug_packet(af, pp, skb, ofs, msg);	\

  	} while (0)

  #else	/* NO DEBUGGING at ALL */

  #define IP_VS_DBG_BUF(level, msg...)  do {} while (0)
  #define IP_VS_ERR_BUF(msg...)  do {} while (0)

  #define IP_VS_DBG(level, msg...)  do {} while (0)
  #define IP_VS_DBG_RL(msg...)  do {} while (0)

  #define IP_VS_DBG_PKT(level, af, pp, skb, ofs, msg)	do {} while (0)
  #define IP_VS_DBG_RL_PKT(level, af, pp, skb, ofs, msg)	do {} while (0)

  #endif
  
  #define IP_VS_BUG() BUG()

  #define IP_VS_ERR_RL(msg, ...)						\

  	do {								\
  		if (net_ratelimit())					\

  			pr_err(msg, ##__VA_ARGS__);			\

  	} while (0)

  
  #ifdef CONFIG_IP_VS_DEBUG
  #define EnterFunction(level)						\

  	do {								\
  		if (level <= ip_vs_get_debug_level())			\
  			printk(KERN_DEBUG				\
  			       pr_fmt("Enter: %s, %s line %i
  "),	\
  			       __func__, __FILE__, __LINE__);		\
  	} while (0)
  #define LeaveFunction(level)						\
  	do {								\
  		if (level <= ip_vs_get_debug_level())			\
  			printk(KERN_DEBUG				\
  			       pr_fmt("Leave: %s, %s line %i
  "),	\
  			       __func__, __FILE__, __LINE__);		\
  	} while (0)

  #else
  #define EnterFunction(level)   do {} while (0)
  #define LeaveFunction(level)   do {} while (0)
  #endif

  /* The port number of FTP service (in network order). */

  #define FTPPORT  cpu_to_be16(21)
  #define FTPDATA  cpu_to_be16(20)

  /* TCP State Values */

  enum {
  	IP_VS_TCP_S_NONE = 0,
  	IP_VS_TCP_S_ESTABLISHED,
  	IP_VS_TCP_S_SYN_SENT,
  	IP_VS_TCP_S_SYN_RECV,
  	IP_VS_TCP_S_FIN_WAIT,
  	IP_VS_TCP_S_TIME_WAIT,
  	IP_VS_TCP_S_CLOSE,
  	IP_VS_TCP_S_CLOSE_WAIT,
  	IP_VS_TCP_S_LAST_ACK,
  	IP_VS_TCP_S_LISTEN,
  	IP_VS_TCP_S_SYNACK,
  	IP_VS_TCP_S_LAST
  };

  /* UDP State Values */

  enum {
  	IP_VS_UDP_S_NORMAL,
  	IP_VS_UDP_S_LAST,
  };

  /* ICMP State Values */

  enum {
  	IP_VS_ICMP_S_NORMAL,
  	IP_VS_ICMP_S_LAST,
  };

  /* SCTP State Values */

  enum ip_vs_sctp_states {
  	IP_VS_SCTP_S_NONE,

  	IP_VS_SCTP_S_INIT1,
  	IP_VS_SCTP_S_INIT,
  	IP_VS_SCTP_S_COOKIE_SENT,
  	IP_VS_SCTP_S_COOKIE_REPLIED,
  	IP_VS_SCTP_S_COOKIE_WAIT,
  	IP_VS_SCTP_S_COOKIE,
  	IP_VS_SCTP_S_COOKIE_ECHOED,

  	IP_VS_SCTP_S_ESTABLISHED,

  	IP_VS_SCTP_S_SHUTDOWN_SENT,
  	IP_VS_SCTP_S_SHUTDOWN_RECEIVED,
  	IP_VS_SCTP_S_SHUTDOWN_ACK_SENT,
  	IP_VS_SCTP_S_REJECTED,

  	IP_VS_SCTP_S_CLOSED,
  	IP_VS_SCTP_S_LAST
  };

  /* Delta sequence info structure
   * Each ip_vs_conn has 2 (output AND input seq. changes).
   * Only used in the VS/NAT.

   */
  struct ip_vs_seq {
  	__u32			init_seq;	/* Add delta from this seq */
  	__u32			delta;		/* Delta in sequence numbers */
  	__u32			previous_delta;	/* Delta in sequence numbers

  						 * before last resized pkt */

  };

  /* counters per cpu */

  struct ip_vs_counters {

  	__u64		conns;		/* connections scheduled */
  	__u64		inpkts;		/* incoming packets */
  	__u64		outpkts;	/* outgoing packets */

  	__u64		inbytes;	/* incoming bytes */
  	__u64		outbytes;	/* outgoing bytes */
  };

  /* Stats per cpu */

  struct ip_vs_cpu_stats {

  	struct ip_vs_counters   cnt;

  	struct u64_stats_sync   syncp;
  };

  /* IPVS statistics objects */

  struct ip_vs_estimator {
  	struct list_head	list;
  
  	u64			last_inbytes;
  	u64			last_outbytes;

  	u64			last_conns;
  	u64			last_inpkts;
  	u64			last_outpkts;
  
  	u64			cps;
  	u64			inpps;
  	u64			outpps;
  	u64			inbps;
  	u64			outbps;
  };
  
  /*
   * IPVS statistics object, 64-bit kernel version of struct ip_vs_stats_user
   */
  struct ip_vs_kstats {
  	u64			conns;		/* connections scheduled */
  	u64			inpkts;		/* incoming packets */
  	u64			outpkts;	/* outgoing packets */
  	u64			inbytes;	/* incoming bytes */
  	u64			outbytes;	/* outgoing bytes */
  
  	u64			cps;		/* current connection rate */
  	u64			inpps;		/* current in packet rate */
  	u64			outpps;		/* current out packet rate */
  	u64			inbps;		/* current in byte rate */
  	u64			outbps;		/* current out byte rate */

  };

  struct ip_vs_stats {

  	struct ip_vs_kstats	kstats;		/* kernel statistics */

  	struct ip_vs_estimator	est;		/* estimator */

  	struct ip_vs_cpu_stats __percpu	*cpustats;	/* per cpu counters */

  	spinlock_t		lock;		/* spin lock */

  	struct ip_vs_kstats	kstats0;	/* reset values */

  };

  struct dst_entry;
  struct iphdr;

  struct ip_vs_conn;
  struct ip_vs_app;

  struct sk_buff;

  struct ip_vs_proto_data;

  
  struct ip_vs_protocol {
  	struct ip_vs_protocol	*next;
  	char			*name;

  	u16			protocol;
  	u16			num_states;

  	int			dont_defrag;

  
  	void (*init)(struct ip_vs_protocol *pp);
  
  	void (*exit)(struct ip_vs_protocol *pp);

  	int (*init_netns)(struct netns_ipvs *ipvs, struct ip_vs_proto_data *pd);

  	void (*exit_netns)(struct netns_ipvs *ipvs, struct ip_vs_proto_data *pd);

  	int (*conn_schedule)(struct netns_ipvs *ipvs,
  			     int af, struct sk_buff *skb,

  			     struct ip_vs_proto_data *pd,

  			     int *verdict, struct ip_vs_conn **cpp,
  			     struct ip_vs_iphdr *iph);

  
  	struct ip_vs_conn *

  	(*conn_in_get)(struct netns_ipvs *ipvs,
  		       int af,

  		       const struct sk_buff *skb,

  		       const struct ip_vs_iphdr *iph);

  
  	struct ip_vs_conn *

  	(*conn_out_get)(struct netns_ipvs *ipvs,
  			int af,

  			const struct sk_buff *skb,

  			const struct ip_vs_iphdr *iph);

  	int (*snat_handler)(struct sk_buff *skb, struct ip_vs_protocol *pp,
  			    struct ip_vs_conn *cp, struct ip_vs_iphdr *iph);

  	int (*dnat_handler)(struct sk_buff *skb, struct ip_vs_protocol *pp,
  			    struct ip_vs_conn *cp, struct ip_vs_iphdr *iph);

  	int (*csum_check)(int af, struct sk_buff *skb,
  			  struct ip_vs_protocol *pp);

  
  	const char *(*state_name)(int state);

  	void (*state_transition)(struct ip_vs_conn *cp, int direction,
  				 const struct sk_buff *skb,
  				 struct ip_vs_proto_data *pd);

  	int (*register_app)(struct netns_ipvs *ipvs, struct ip_vs_app *inc);

  	void (*unregister_app)(struct netns_ipvs *ipvs, struct ip_vs_app *inc);

  
  	int (*app_conn_bind)(struct ip_vs_conn *cp);

  	void (*debug_packet)(int af, struct ip_vs_protocol *pp,

  			     const struct sk_buff *skb,
  			     int offset,
  			     const char *msg);

  	void (*timeout_change)(struct ip_vs_proto_data *pd, int flags);

  };

  /* protocol data per netns */

  struct ip_vs_proto_data {
  	struct ip_vs_proto_data	*next;
  	struct ip_vs_protocol	*pp;
  	int			*timeout_table;	/* protocol timeout table */
  	atomic_t		appcnt;		/* counter of proto app incs. */
  	struct tcp_states_t	*tcp_state_table;
  };

  struct ip_vs_protocol   *ip_vs_proto_get(unsigned short proto);

  struct ip_vs_proto_data *ip_vs_proto_data_get(struct netns_ipvs *ipvs,

  					      unsigned short proto);

  struct ip_vs_conn_param {

  	struct netns_ipvs		*ipvs;

  	const union nf_inet_addr	*caddr;
  	const union nf_inet_addr	*vaddr;
  	__be16				cport;
  	__be16				vport;
  	__u16				protocol;
  	u16				af;

  
  	const struct ip_vs_pe		*pe;
  	char				*pe_data;
  	__u8				pe_data_len;

  };

  /* IP_VS structure allocated for each dynamically scheduled connection */

  struct ip_vs_conn {

  	struct hlist_node	c_list;         /* hashed list heads */

  	/* Protocol, addresses and port numbers */

  	__be16                  cport;

  	__be16                  dport;

  	__be16                  vport;
  	u16			af;		/* address family */

  	union nf_inet_addr      caddr;          /* client address */
  	union nf_inet_addr      vaddr;          /* virtual address */
  	union nf_inet_addr      daddr;          /* destination address */
  	volatile __u32          flags;          /* status flags */

  	__u16                   protocol;       /* Which protocol (TCP/UDP) */

  	__u16			daf;		/* Address family of the dest */

  	struct netns_ipvs	*ipvs;

  
  	/* counter and timer */
  	atomic_t		refcnt;		/* reference count */
  	struct timer_list	timer;		/* Expiration timer */
  	volatile unsigned long	timeout;	/* timeout */
  
  	/* Flags and state transition */
  	spinlock_t              lock;           /* lock for state transition */

  	volatile __u16          state;          /* state info */

  	volatile __u16          old_state;      /* old state, to be used for
  						 * state transition triggerd
  						 * synchronization
  						 */

  	__u32			fwmark;		/* Fire wall mark from skb */

  	unsigned long		sync_endtime;	/* jiffies + sent_retries */

  
  	/* Control members */
  	struct ip_vs_conn       *control;       /* Master control connection */
  	atomic_t                n_control;      /* Number of controlled ones */
  	struct ip_vs_dest       *dest;          /* real server */
  	atomic_t                in_pkts;        /* incoming packet counter */

  	/* Packet transmitter for different forwarding methods.  If it
  	 * mangles the packet, it must return NF_DROP or better NF_STOLEN,
  	 * otherwise this must be changed to a sk_buff **.
  	 * NF_ACCEPT can be returned when destination is local.

  	 */
  	int (*packet_xmit)(struct sk_buff *skb, struct ip_vs_conn *cp,

  			   struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);

  
  	/* Note: we can group the following members into a structure,

  	 * in order to save more space, and the following members are
  	 * only used in VS/NAT anyway
  	 */

  	struct ip_vs_app        *app;           /* bound ip_vs_app object */
  	void                    *app_data;      /* Application private data */
  	struct ip_vs_seq        in_seq;         /* incoming seq. struct */
  	struct ip_vs_seq        out_seq;        /* outgoing seq. struct */

  	const struct ip_vs_pe	*pe;

  	char			*pe_data;
  	__u8			pe_data_len;

  
  	struct rcu_head		rcu_head;

  };

  /* Extended internal versions of struct ip_vs_service_user and ip_vs_dest_user
   * for IPv6 support.

   *

   * We need these to conveniently pass around service and destination
   * options, but unfortunately, we also need to keep the old definitions to
   * maintain userspace backwards compatibility for the setsockopt interface.

   */
  struct ip_vs_service_user_kern {
  	/* virtual service addresses */
  	u16			af;
  	u16			protocol;
  	union nf_inet_addr	addr;		/* virtual ip address */

  	__be16			port;

  	u32			fwmark;		/* firwall mark of service */
  
  	/* virtual service options */
  	char			*sched_name;

  	char			*pe_name;

  	unsigned int		flags;		/* virtual service flags */
  	unsigned int		timeout;	/* persistent timeout in sec */

  	__be32			netmask;	/* persistent netmask or plen */

  };
  
  
  struct ip_vs_dest_user_kern {
  	/* destination server address */
  	union nf_inet_addr	addr;

  	__be16			port;

  
  	/* real server options */

  	unsigned int		conn_flags;	/* connection flags */

  	int			weight;		/* destination weight */
  
  	/* thresholds for active connections */
  	u32			u_threshold;	/* upper threshold */
  	u32			l_threshold;	/* lower threshold */

  
  	/* Address family of addr */
  	u16			af;

  };
  
  
  /*

   * The information about the virtual service offered to the net and the
   * forwarding entries.

   */
  struct ip_vs_service {

  	struct hlist_node	s_list;   /* for normal service table */
  	struct hlist_node	f_list;   /* for fwmark-based service table */

  	atomic_t		refcnt;   /* reference counter */

  	u16			af;       /* address family */

  	__u16			protocol; /* which protocol (TCP/UDP) */

  	union nf_inet_addr	addr;	  /* IP address for virtual service */

  	__be16			port;	  /* port number for the service */

  	__u32                   fwmark;   /* firewall mark of the service */

  	unsigned int		flags;	  /* service status flags */
  	unsigned int		timeout;  /* persistent timeout in ticks */

  	__be32			netmask;  /* grouping granularity, mask/plen */

  	struct netns_ipvs	*ipvs;

  
  	struct list_head	destinations;  /* real server d-linked list */
  	__u32			num_dests;     /* number of servers */
  	struct ip_vs_stats      stats;         /* statistics for the service */

  
  	/* for scheduling */

  	struct ip_vs_scheduler __rcu *scheduler; /* bound scheduler object */

  	spinlock_t		sched_lock;    /* lock sched_data */

  	void			*sched_data;   /* scheduler application data */

  
  	/* alternate persistence engine */

  	struct ip_vs_pe __rcu	*pe;
  
  	struct rcu_head		rcu_head;

  };

  /* Information for cached dst */
  struct ip_vs_dest_dst {
  	struct dst_entry	*dst_cache;	/* destination cache entry */
  	u32			dst_cookie;
  	union nf_inet_addr	dst_saddr;
  	struct rcu_head		rcu_head;
  };

  /* The real server destination forwarding entry with ip address, port number,
   * and so on.

   */
  struct ip_vs_dest {
  	struct list_head	n_list;   /* for the dests in the service */

  	struct hlist_node	d_list;   /* for table with all the dests */

  	u16			af;		/* address family */

  	__be16			port;		/* port number of the server */

  	union nf_inet_addr	addr;		/* IP address of the server */

  	volatile unsigned int	flags;		/* dest status flags */

  	atomic_t		conn_flags;	/* flags to copy to conn */
  	atomic_t		weight;		/* server weight */
  
  	atomic_t		refcnt;		/* reference counter */
  	struct ip_vs_stats      stats;          /* statistics */

  	unsigned long		idle_start;	/* start time, jiffies */

  
  	/* connection counters and thresholds */
  	atomic_t		activeconns;	/* active connections */
  	atomic_t		inactconns;	/* inactive connections */
  	atomic_t		persistconns;	/* persistent connections */
  	__u32			u_threshold;	/* upper threshold */
  	__u32			l_threshold;	/* lower threshold */
  
  	/* for destination cache */
  	spinlock_t		dst_lock;	/* lock of dst_cache */

  	struct ip_vs_dest_dst __rcu *dest_dst;	/* cached dst info */

  
  	/* for virtual service */

  	struct ip_vs_service __rcu *svc;	/* service it belongs to */

  	__u16			protocol;	/* which protocol (TCP/UDP) */

  	__be16			vport;		/* virtual port number */

  	union nf_inet_addr	vaddr;		/* virtual IP address */

  	__u32			vfwmark;	/* firewall mark of service */

  	struct list_head	t_list;		/* in dest_trash */

  	unsigned int		in_rs_table:1;	/* we are in rs_table */

  };

  /* The scheduler object */

  struct ip_vs_scheduler {
  	struct list_head	n_list;		/* d-linked list head */
  	char			*name;		/* scheduler name */
  	atomic_t		refcnt;		/* reference counter */
  	struct module		*module;	/* THIS_MODULE/NULL */
  
  	/* scheduler initializing service */
  	int (*init_service)(struct ip_vs_service *svc);
  	/* scheduling service finish */

  	void (*done_service)(struct ip_vs_service *svc);

  	/* dest is linked */
  	int (*add_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest);
  	/* dest is unlinked */
  	int (*del_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest);
  	/* dest is updated */
  	int (*upd_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest);

  
  	/* selecting a server from the given service */
  	struct ip_vs_dest* (*schedule)(struct ip_vs_service *svc,

  				       const struct sk_buff *skb,
  				       struct ip_vs_iphdr *iph);

  };

  /* The persistence engine object */
  struct ip_vs_pe {
  	struct list_head	n_list;		/* d-linked list head */
  	char			*name;		/* scheduler name */
  	atomic_t		refcnt;		/* reference counter */
  	struct module		*module;	/* THIS_MODULE/NULL */
  
  	/* get the connection template, if any */
  	int (*fill_param)(struct ip_vs_conn_param *p, struct sk_buff *skb);
  	bool (*ct_match)(const struct ip_vs_conn_param *p,
  			 struct ip_vs_conn *ct);
  	u32 (*hashkey_raw)(const struct ip_vs_conn_param *p, u32 initval,
  			   bool inverse);

  	int (*show_pe_data)(const struct ip_vs_conn *cp, char *buf);

  	/* create connections for real-server outgoing packets */
  	struct ip_vs_conn* (*conn_out)(struct ip_vs_service *svc,
  				       struct ip_vs_dest *dest,
  				       struct sk_buff *skb,
  				       const struct ip_vs_iphdr *iph,
  				       __be16 dport, __be16 cport);

  };

  /* The application module object (a.k.a. app incarnation) */

  struct ip_vs_app {

  	struct list_head	a_list;		/* member in app list */
  	int			type;		/* IP_VS_APP_TYPE_xxx */
  	char			*name;		/* application module name */
  	__u16			protocol;
  	struct module		*module;	/* THIS_MODULE/NULL */
  	struct list_head	incs_list;	/* list of incarnations */
  
  	/* members for application incarnations */
  	struct list_head	p_list;		/* member in proto app list */
  	struct ip_vs_app	*app;		/* its real application */

  	__be16			port;		/* port number in net order */

  	atomic_t		usecnt;		/* usage counter */

  	struct rcu_head		rcu_head;

  	/* output hook: Process packet in inout direction, diff set for TCP.

  	 * Return: 0=Error, 1=Payload Not Mangled/Mangled but checksum is ok,
  	 *	   2=Mangled but checksum was not updated
  	 */

  	int (*pkt_out)(struct ip_vs_app *, struct ip_vs_conn *,

  		       struct sk_buff *, int *diff);

  	/* input hook: Process packet in outin direction, diff set for TCP.

  	 * Return: 0=Error, 1=Payload Not Mangled/Mangled but checksum is ok,
  	 *	   2=Mangled but checksum was not updated
  	 */

  	int (*pkt_in)(struct ip_vs_app *, struct ip_vs_conn *,

  		      struct sk_buff *, int *diff);

  
  	/* ip_vs_app initializer */
  	int (*init_conn)(struct ip_vs_app *, struct ip_vs_conn *);
  
  	/* ip_vs_app finish */
  	int (*done_conn)(struct ip_vs_app *, struct ip_vs_conn *);
  
  
  	/* not used now */
  	int (*bind_conn)(struct ip_vs_app *, struct ip_vs_conn *,
  			 struct ip_vs_protocol *);
  
  	void (*unbind_conn)(struct ip_vs_app *, struct ip_vs_conn *);
  
  	int *			timeout_table;
  	int *			timeouts;
  	int			timeouts_size;
  
  	int (*conn_schedule)(struct sk_buff *skb, struct ip_vs_app *app,
  			     int *verdict, struct ip_vs_conn **cpp);
  
  	struct ip_vs_conn *
  	(*conn_in_get)(const struct sk_buff *skb, struct ip_vs_app *app,

  		       const struct iphdr *iph, int inverse);

  
  	struct ip_vs_conn *
  	(*conn_out_get)(const struct sk_buff *skb, struct ip_vs_app *app,

  			const struct iphdr *iph, int inverse);

  
  	int (*state_transition)(struct ip_vs_conn *cp, int direction,
  				const struct sk_buff *skb,
  				struct ip_vs_app *app);
  
  	void (*timeout_change)(struct ip_vs_app *app, int flags);
  };

  struct ipvs_master_sync_state {
  	struct list_head	sync_queue;
  	struct ip_vs_sync_buff	*sync_buff;

  	unsigned long		sync_queue_len;

  	unsigned int		sync_queue_delay;
  	struct task_struct	*master_thread;
  	struct delayed_work	master_wakeup_work;
  	struct netns_ipvs	*ipvs;
  };

  /* How much time to keep dests in trash */
  #define IP_VS_DEST_TRASH_PERIOD		(120 * HZ)

  struct ipvs_sync_daemon_cfg {

  	union nf_inet_addr	mcast_group;

  	int			syncid;
  	u16			sync_maxlen;

  	u16			mcast_port;
  	u8			mcast_af;
  	u8			mcast_ttl;

  	/* multicast interface name */
  	char			mcast_ifn[IP_VS_IFNAME_MAXLEN];
  };

  /* IPVS in network namespace */
  struct netns_ipvs {
  	int			gen;		/* Generation */

  	int			enable;		/* enable like nf_hooks do */

  	/* Hash table: for real service lookups */

  	#define IP_VS_RTAB_BITS 4
  	#define IP_VS_RTAB_SIZE (1 << IP_VS_RTAB_BITS)
  	#define IP_VS_RTAB_MASK (IP_VS_RTAB_SIZE - 1)

  	struct hlist_head	rs_table[IP_VS_RTAB_SIZE];

  	/* ip_vs_app */
  	struct list_head	app_list;

  	/* ip_vs_proto */
  	#define IP_VS_PROTO_TAB_SIZE	32	/* must be power of 2 */
  	struct ip_vs_proto_data *proto_data_table[IP_VS_PROTO_TAB_SIZE];
  	/* ip_vs_proto_tcp */
  #ifdef CONFIG_IP_VS_PROTO_TCP
  	#define	TCP_APP_TAB_BITS	4
  	#define	TCP_APP_TAB_SIZE	(1 << TCP_APP_TAB_BITS)
  	#define	TCP_APP_TAB_MASK	(TCP_APP_TAB_SIZE - 1)
  	struct list_head	tcp_apps[TCP_APP_TAB_SIZE];

  #endif
  	/* ip_vs_proto_udp */
  #ifdef CONFIG_IP_VS_PROTO_UDP
  	#define	UDP_APP_TAB_BITS	4
  	#define	UDP_APP_TAB_SIZE	(1 << UDP_APP_TAB_BITS)
  	#define	UDP_APP_TAB_MASK	(UDP_APP_TAB_SIZE - 1)
  	struct list_head	udp_apps[UDP_APP_TAB_SIZE];

  #endif
  	/* ip_vs_proto_sctp */
  #ifdef CONFIG_IP_VS_PROTO_SCTP
  	#define SCTP_APP_TAB_BITS	4
  	#define SCTP_APP_TAB_SIZE	(1 << SCTP_APP_TAB_BITS)
  	#define SCTP_APP_TAB_MASK	(SCTP_APP_TAB_SIZE - 1)
  	/* Hash table for SCTP application incarnations	 */
  	struct list_head	sctp_apps[SCTP_APP_TAB_SIZE];

  #endif
  	/* ip_vs_conn */

  	atomic_t		conn_count;      /* connection counter */

  
  	/* ip_vs_ctl */

  	struct ip_vs_stats		tot_stats;  /* Statistics & est. */

  
  	int			num_services;    /* no of virtual services */

  	/* Trash for destinations */
  	struct list_head	dest_trash;

  	spinlock_t		dest_trash_lock;
  	struct timer_list	dest_trash_timer; /* expiration timer */

  	/* Service counters */
  	atomic_t		ftpsvc_counter;
  	atomic_t		nullsvc_counter;

  	atomic_t		conn_out_counter;

  
  #ifdef CONFIG_SYSCTL

  	/* 1/rate drop and drop-entry variables */
  	struct delayed_work	defense_work;   /* Work handler */
  	int			drop_rate;
  	int			drop_counter;
  	atomic_t		dropentry;
  	/* locks in ctl.c */
  	spinlock_t		dropentry_lock;  /* drop entry handling */
  	spinlock_t		droppacket_lock; /* drop packet handling */
  	spinlock_t		securetcp_lock;  /* state and timeout tables */

  
  	/* sys-ctl struct */
  	struct ctl_table_header	*sysctl_hdr;
  	struct ctl_table	*sysctl_tbl;

  #endif

  	/* sysctl variables */
  	int			sysctl_amemthresh;
  	int			sysctl_am_droprate;
  	int			sysctl_drop_entry;
  	int			sysctl_drop_packet;
  	int			sysctl_secure_tcp;
  #ifdef CONFIG_IP_VS_NFCT
  	int			sysctl_conntrack;
  #endif
  	int			sysctl_snat_reroute;
  	int			sysctl_sync_ver;

  	int			sysctl_sync_ports;

  	int			sysctl_sync_persist_mode;

  	unsigned long		sysctl_sync_qlen_max;

  	int			sysctl_sync_sock_size;

  	int			sysctl_cache_bypass;
  	int			sysctl_expire_nodest_conn;

  	int			sysctl_sloppy_tcp;
  	int			sysctl_sloppy_sctp;

  	int			sysctl_expire_quiescent_template;
  	int			sysctl_sync_threshold[2];

  	unsigned int		sysctl_sync_refresh_period;
  	int			sysctl_sync_retries;

  	int			sysctl_nat_icmp_send;

  	int			sysctl_pmtu_disc;

  	int			sysctl_backup_only;

  	int			sysctl_conn_reuse_mode;

  	int			sysctl_schedule_icmp;

  	int			sysctl_ignore_tunneled;

  
  	/* ip_vs_lblc */
  	int			sysctl_lblc_expiration;
  	struct ctl_table_header	*lblc_ctl_header;
  	struct ctl_table	*lblc_ctl_table;
  	/* ip_vs_lblcr */
  	int			sysctl_lblcr_expiration;
  	struct ctl_table_header	*lblcr_ctl_header;
  	struct ctl_table	*lblcr_ctl_table;
  	/* ip_vs_est */
  	struct list_head	est_list;	/* estimator list */
  	spinlock_t		est_lock;
  	struct timer_list	est_timer;	/* Estimation timer */
  	/* ip_vs_sync */

  	spinlock_t		sync_lock;

  	struct ipvs_master_sync_state *ms;

  	spinlock_t		sync_buff_lock;

  	struct task_struct	**backup_threads;
  	int			threads_mask;

  	volatile int		sync_state;

  	struct mutex		sync_mutex;

  	struct ipvs_sync_daemon_cfg	mcfg;	/* Master Configuration */
  	struct ipvs_sync_daemon_cfg	bcfg;	/* Backup Configuration */

  	/* net name space ptr */
  	struct net		*net;            /* Needed by timer routines */

  	/* Number of heterogeneous destinations, needed becaus heterogeneous
  	 * are not supported when synchronization is enabled.
  	 */

  	unsigned int		mixed_address_family_dests;

  };

  #define DEFAULT_SYNC_THRESHOLD	3
  #define DEFAULT_SYNC_PERIOD	50

  #define DEFAULT_SYNC_VER	1

  #define DEFAULT_SLOPPY_TCP	0
  #define DEFAULT_SLOPPY_SCTP	0

  #define DEFAULT_SYNC_REFRESH_PERIOD	(0U * HZ)
  #define DEFAULT_SYNC_RETRIES		0

  #define IPVS_SYNC_WAKEUP_RATE	8
  #define IPVS_SYNC_QLEN_MAX	(IPVS_SYNC_WAKEUP_RATE * 4)
  #define IPVS_SYNC_SEND_DELAY	(HZ / 50)
  #define IPVS_SYNC_CHECK_PERIOD	HZ

  #define IPVS_SYNC_FLUSH_TIME	(HZ * 2)

  #define IPVS_SYNC_PORTS_MAX	(1 << 6)

  
  #ifdef CONFIG_SYSCTL
  
  static inline int sysctl_sync_threshold(struct netns_ipvs *ipvs)
  {
  	return ipvs->sysctl_sync_threshold[0];
  }
  
  static inline int sysctl_sync_period(struct netns_ipvs *ipvs)
  {

  	return ACCESS_ONCE(ipvs->sysctl_sync_threshold[1]);
  }
  
  static inline unsigned int sysctl_sync_refresh_period(struct netns_ipvs *ipvs)
  {
  	return ACCESS_ONCE(ipvs->sysctl_sync_refresh_period);
  }
  
  static inline int sysctl_sync_retries(struct netns_ipvs *ipvs)
  {
  	return ipvs->sysctl_sync_retries;

  }

  static inline int sysctl_sync_ver(struct netns_ipvs *ipvs)
  {
  	return ipvs->sysctl_sync_ver;
  }

  static inline int sysctl_sloppy_tcp(struct netns_ipvs *ipvs)
  {
  	return ipvs->sysctl_sloppy_tcp;
  }
  
  static inline int sysctl_sloppy_sctp(struct netns_ipvs *ipvs)
  {
  	return ipvs->sysctl_sloppy_sctp;
  }

  static inline int sysctl_sync_ports(struct netns_ipvs *ipvs)
  {
  	return ACCESS_ONCE(ipvs->sysctl_sync_ports);
  }

  static inline int sysctl_sync_persist_mode(struct netns_ipvs *ipvs)
  {
  	return ipvs->sysctl_sync_persist_mode;
  }

  static inline unsigned long sysctl_sync_qlen_max(struct netns_ipvs *ipvs)

  {
  	return ipvs->sysctl_sync_qlen_max;
  }
  
  static inline int sysctl_sync_sock_size(struct netns_ipvs *ipvs)
  {
  	return ipvs->sysctl_sync_sock_size;
  }

  static inline int sysctl_pmtu_disc(struct netns_ipvs *ipvs)
  {
  	return ipvs->sysctl_pmtu_disc;
  }

  static inline int sysctl_backup_only(struct netns_ipvs *ipvs)
  {
  	return ipvs->sync_state & IP_VS_STATE_BACKUP &&
  	       ipvs->sysctl_backup_only;
  }

  static inline int sysctl_conn_reuse_mode(struct netns_ipvs *ipvs)
  {
  	return ipvs->sysctl_conn_reuse_mode;
  }

  static inline int sysctl_schedule_icmp(struct netns_ipvs *ipvs)
  {
  	return ipvs->sysctl_schedule_icmp;
  }

  static inline int sysctl_ignore_tunneled(struct netns_ipvs *ipvs)
  {
  	return ipvs->sysctl_ignore_tunneled;
  }

  static inline int sysctl_cache_bypass(struct netns_ipvs *ipvs)
  {
  	return ipvs->sysctl_cache_bypass;
  }

  #else
  
  static inline int sysctl_sync_threshold(struct netns_ipvs *ipvs)
  {
  	return DEFAULT_SYNC_THRESHOLD;
  }
  
  static inline int sysctl_sync_period(struct netns_ipvs *ipvs)
  {
  	return DEFAULT_SYNC_PERIOD;
  }

  static inline unsigned int sysctl_sync_refresh_period(struct netns_ipvs *ipvs)
  {
  	return DEFAULT_SYNC_REFRESH_PERIOD;
  }
  
  static inline int sysctl_sync_retries(struct netns_ipvs *ipvs)
  {
  	return DEFAULT_SYNC_RETRIES & 3;
  }

  static inline int sysctl_sync_ver(struct netns_ipvs *ipvs)
  {
  	return DEFAULT_SYNC_VER;
  }

  static inline int sysctl_sloppy_tcp(struct netns_ipvs *ipvs)
  {
  	return DEFAULT_SLOPPY_TCP;
  }
  
  static inline int sysctl_sloppy_sctp(struct netns_ipvs *ipvs)
  {
  	return DEFAULT_SLOPPY_SCTP;
  }

  static inline int sysctl_sync_ports(struct netns_ipvs *ipvs)
  {
  	return 1;
  }

  static inline int sysctl_sync_persist_mode(struct netns_ipvs *ipvs)
  {
  	return 0;
  }

  static inline unsigned long sysctl_sync_qlen_max(struct netns_ipvs *ipvs)

  {
  	return IPVS_SYNC_QLEN_MAX;
  }
  
  static inline int sysctl_sync_sock_size(struct netns_ipvs *ipvs)
  {
  	return 0;
  }

  static inline int sysctl_pmtu_disc(struct netns_ipvs *ipvs)
  {
  	return 1;
  }

  static inline int sysctl_backup_only(struct netns_ipvs *ipvs)
  {
  	return 0;
  }

  static inline int sysctl_conn_reuse_mode(struct netns_ipvs *ipvs)
  {
  	return 1;
  }

  static inline int sysctl_schedule_icmp(struct netns_ipvs *ipvs)
  {
  	return 0;
  }

  static inline int sysctl_ignore_tunneled(struct netns_ipvs *ipvs)
  {
  	return 0;
  }

  static inline int sysctl_cache_bypass(struct netns_ipvs *ipvs)
  {
  	return 0;
  }

  #endif

  /* IPVS core functions
   * (from ip_vs_core.c)

   */

  const char *ip_vs_proto_name(unsigned int proto);
  void ip_vs_init_hash_table(struct list_head *table, int rows);

  struct ip_vs_conn *ip_vs_new_conn_out(struct ip_vs_service *svc,
  				      struct ip_vs_dest *dest,
  				      struct sk_buff *skb,
  				      const struct ip_vs_iphdr *iph,
  				      __be16 dport,
  				      __be16 cport);

  #define IP_VS_INIT_HASH_TABLE(t) ip_vs_init_hash_table((t), ARRAY_SIZE((t)))

  #define IP_VS_APP_TYPE_FTP	1

  /* ip_vs_conn handling functions
   * (from ip_vs_conn.c)

   */

  enum {
  	IP_VS_DIR_INPUT = 0,
  	IP_VS_DIR_OUTPUT,
  	IP_VS_DIR_INPUT_ONLY,
  	IP_VS_DIR_LAST,
  };

  static inline void ip_vs_conn_fill_param(struct netns_ipvs *ipvs, int af, int protocol,

  					 const union nf_inet_addr *caddr,
  					 __be16 cport,
  					 const union nf_inet_addr *vaddr,
  					 __be16 vport,
  					 struct ip_vs_conn_param *p)
  {

  	p->ipvs = ipvs;

  	p->af = af;
  	p->protocol = protocol;
  	p->caddr = caddr;
  	p->cport = cport;
  	p->vaddr = vaddr;
  	p->vport = vport;

  	p->pe = NULL;
  	p->pe_data = NULL;

  }

  struct ip_vs_conn *ip_vs_conn_in_get(const struct ip_vs_conn_param *p);
  struct ip_vs_conn *ip_vs_ct_in_get(const struct ip_vs_conn_param *p);

  struct ip_vs_conn * ip_vs_conn_in_get_proto(struct netns_ipvs *ipvs, int af,
  					    const struct sk_buff *skb,

  					    const struct ip_vs_iphdr *iph);

  struct ip_vs_conn *ip_vs_conn_out_get(const struct ip_vs_conn_param *p);

  struct ip_vs_conn * ip_vs_conn_out_get_proto(struct netns_ipvs *ipvs, int af,
  					     const struct sk_buff *skb,

  					     const struct ip_vs_iphdr *iph);

  /* Get reference to gain full access to conn.
   * By default, RCU read-side critical sections have access only to
   * conn fields and its PE data, see ip_vs_conn_rcu_free() for reference.
   */
  static inline bool __ip_vs_conn_get(struct ip_vs_conn *cp)
  {
  	return atomic_inc_not_zero(&cp->refcnt);
  }

  /* put back the conn without restarting its timer */
  static inline void __ip_vs_conn_put(struct ip_vs_conn *cp)
  {

  	smp_mb__before_atomic();

  	atomic_dec(&cp->refcnt);
  }

  void ip_vs_conn_put(struct ip_vs_conn *cp);
  void ip_vs_conn_fill_cport(struct ip_vs_conn *cp, __be16 cport);

  struct ip_vs_conn *ip_vs_conn_new(const struct ip_vs_conn_param *p, int dest_af,

  				  const union nf_inet_addr *daddr,

  				  __be16 dport, unsigned int flags,

  				  struct ip_vs_dest *dest, __u32 fwmark);

  void ip_vs_conn_expire_now(struct ip_vs_conn *cp);

  const char *ip_vs_state_name(__u16 proto, int state);

  void ip_vs_tcp_conn_listen(struct ip_vs_conn *cp);

  int ip_vs_check_template(struct ip_vs_conn *ct, struct ip_vs_dest *cdest);

  void ip_vs_random_dropentry(struct netns_ipvs *ipvs);

  int ip_vs_conn_init(void);
  void ip_vs_conn_cleanup(void);

  
  static inline void ip_vs_control_del(struct ip_vs_conn *cp)
  {
  	struct ip_vs_conn *ctl_cp = cp->control;
  	if (!ctl_cp) {

  		IP_VS_ERR_BUF("request control DEL for uncontrolled: "
  			      "%s:%d to %s:%d
  ",
  			      IP_VS_DBG_ADDR(cp->af, &cp->caddr),
  			      ntohs(cp->cport),
  			      IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
  			      ntohs(cp->vport));

  		return;
  	}

  	IP_VS_DBG_BUF(7, "DELeting control for: "
  		      "cp.dst=%s:%d ctl_cp.dst=%s:%d
  ",
  		      IP_VS_DBG_ADDR(cp->af, &cp->caddr),
  		      ntohs(cp->cport),
  		      IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr),
  		      ntohs(ctl_cp->cport));

  
  	cp->control = NULL;
  	if (atomic_read(&ctl_cp->n_control) == 0) {

  		IP_VS_ERR_BUF("BUG control DEL with n=0 : "
  			      "%s:%d to %s:%d
  ",
  			      IP_VS_DBG_ADDR(cp->af, &cp->caddr),
  			      ntohs(cp->cport),
  			      IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
  			      ntohs(cp->vport));

  		return;
  	}
  	atomic_dec(&ctl_cp->n_control);
  }
  
  static inline void
  ip_vs_control_add(struct ip_vs_conn *cp, struct ip_vs_conn *ctl_cp)
  {
  	if (cp->control) {

  		IP_VS_ERR_BUF("request control ADD for already controlled: "
  			      "%s:%d to %s:%d
  ",
  			      IP_VS_DBG_ADDR(cp->af, &cp->caddr),
  			      ntohs(cp->cport),
  			      IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
  			      ntohs(cp->vport));

  		ip_vs_control_del(cp);
  	}

  	IP_VS_DBG_BUF(7, "ADDing control for: "
  		      "cp.dst=%s:%d ctl_cp.dst=%s:%d
  ",
  		      IP_VS_DBG_ADDR(cp->af, &cp->caddr),
  		      ntohs(cp->cport),
  		      IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr),
  		      ntohs(ctl_cp->cport));

  
  	cp->control = ctl_cp;
  	atomic_inc(&ctl_cp->n_control);
  }

  /* IPVS netns init & cleanup functions */

  int ip_vs_estimator_net_init(struct netns_ipvs *ipvs);

  int ip_vs_control_net_init(struct netns_ipvs *ipvs);

  int ip_vs_protocol_net_init(struct netns_ipvs *ipvs);

  int ip_vs_app_net_init(struct netns_ipvs *ipvs);

  int ip_vs_conn_net_init(struct netns_ipvs *ipvs);

  int ip_vs_sync_net_init(struct netns_ipvs *ipvs);

  void ip_vs_conn_net_cleanup(struct netns_ipvs *ipvs);

  void ip_vs_app_net_cleanup(struct netns_ipvs *ipvs);

  void ip_vs_protocol_net_cleanup(struct netns_ipvs *ipvs);

  void ip_vs_control_net_cleanup(struct netns_ipvs *ipvs);

  void ip_vs_estimator_net_cleanup(struct netns_ipvs *ipvs);

  void ip_vs_sync_net_cleanup(struct netns_ipvs *ipvs);

  void ip_vs_service_net_cleanup(struct netns_ipvs *ipvs);

  /* IPVS application functions
   * (from ip_vs_app.c)

   */
  #define IP_VS_APP_MAX_PORTS  8

  struct ip_vs_app *register_ip_vs_app(struct netns_ipvs *ipvs, struct ip_vs_app *app);
  void unregister_ip_vs_app(struct netns_ipvs *ipvs, struct ip_vs_app *app);

  int ip_vs_bind_app(struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
  void ip_vs_unbind_app(struct ip_vs_conn *cp);

  int register_ip_vs_app_inc(struct netns_ipvs *ipvs, struct ip_vs_app *app, __u16 proto,

  			   __u16 port);
  int ip_vs_app_inc_get(struct ip_vs_app *inc);
  void ip_vs_app_inc_put(struct ip_vs_app *inc);
  
  int ip_vs_app_pkt_out(struct ip_vs_conn *, struct sk_buff *skb);
  int ip_vs_app_pkt_in(struct ip_vs_conn *, struct sk_buff *skb);

  int register_ip_vs_pe(struct ip_vs_pe *pe);
  int unregister_ip_vs_pe(struct ip_vs_pe *pe);

  struct ip_vs_pe *ip_vs_pe_getbyname(const char *name);

  struct ip_vs_pe *__ip_vs_pe_getbyname(const char *pe_name);

  /* Use a #define to avoid all of module.h just for these trivial ops */

  #define ip_vs_pe_get(pe)			\
  	if (pe && pe->module)			\

  		__module_get(pe->module);

  #define ip_vs_pe_put(pe)			\
  	if (pe && pe->module)			\

  		module_put(pe->module);

  /* IPVS protocol functions (from ip_vs_proto.c) */

  int ip_vs_protocol_init(void);
  void ip_vs_protocol_cleanup(void);
  void ip_vs_protocol_timeout_change(struct netns_ipvs *ipvs, int flags);
  int *ip_vs_create_timeout_table(int *table, int size);
  int ip_vs_set_state_timeout(int *table, int num, const char *const *names,
  			    const char *name, int to);
  void ip_vs_tcpudp_debug_packet(int af, struct ip_vs_protocol *pp,
  			       const struct sk_buff *skb, int offset,
  			       const char *msg);

  
  extern struct ip_vs_protocol ip_vs_protocol_tcp;
  extern struct ip_vs_protocol ip_vs_protocol_udp;
  extern struct ip_vs_protocol ip_vs_protocol_icmp;
  extern struct ip_vs_protocol ip_vs_protocol_esp;
  extern struct ip_vs_protocol ip_vs_protocol_ah;

  extern struct ip_vs_protocol ip_vs_protocol_sctp;

  /* Registering/unregistering scheduler functions
   * (from ip_vs_sched.c)

   */

  int register_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
  int unregister_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
  int ip_vs_bind_scheduler(struct ip_vs_service *svc,
  			 struct ip_vs_scheduler *scheduler);
  void ip_vs_unbind_scheduler(struct ip_vs_service *svc,
  			    struct ip_vs_scheduler *sched);
  struct ip_vs_scheduler *ip_vs_scheduler_get(const char *sched_name);
  void ip_vs_scheduler_put(struct ip_vs_scheduler *scheduler);
  struct ip_vs_conn *

  ip_vs_schedule(struct ip_vs_service *svc, struct sk_buff *skb,

  	       struct ip_vs_proto_data *pd, int *ignored,
  	       struct ip_vs_iphdr *iph);

  int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb,
  		struct ip_vs_proto_data *pd, struct ip_vs_iphdr *iph);

  void ip_vs_scheduler_err(struct ip_vs_service *svc, const char *msg);

  /* IPVS control data and functions (from ip_vs_ctl.c) */

  extern struct ip_vs_stats ip_vs_stats;

  extern int sysctl_ip_vs_sync_ver;

  struct ip_vs_service *

  ip_vs_service_find(struct netns_ipvs *ipvs, int af, __u32 fwmark, __u16 protocol,

  		  const union nf_inet_addr *vaddr, __be16 vport);

  bool ip_vs_has_real_service(struct netns_ipvs *ipvs, int af, __u16 protocol,

  			    const union nf_inet_addr *daddr, __be16 dport);

  struct ip_vs_dest *
  ip_vs_find_real_service(struct netns_ipvs *ipvs, int af, __u16 protocol,
  			const union nf_inet_addr *daddr, __be16 dport);

  int ip_vs_use_count_inc(void);
  void ip_vs_use_count_dec(void);
  int ip_vs_register_nl_ioctl(void);
  void ip_vs_unregister_nl_ioctl(void);
  int ip_vs_control_init(void);
  void ip_vs_control_cleanup(void);
  struct ip_vs_dest *

  ip_vs_find_dest(struct netns_ipvs *ipvs, int svc_af, int dest_af,

  		const union nf_inet_addr *daddr, __be16 dport,
  		const union nf_inet_addr *vaddr, __be16 vport,

  		__u16 protocol, __u32 fwmark, __u32 flags);

  void ip_vs_try_bind_dest(struct ip_vs_conn *cp);

  static inline void ip_vs_dest_hold(struct ip_vs_dest *dest)
  {
  	atomic_inc(&dest->refcnt);
  }
  
  static inline void ip_vs_dest_put(struct ip_vs_dest *dest)
  {

  	smp_mb__before_atomic();

  	atomic_dec(&dest->refcnt);
  }

  static inline void ip_vs_dest_put_and_free(struct ip_vs_dest *dest)
  {
  	if (atomic_dec_return(&dest->refcnt) < 0)
  		kfree(dest);
  }

  /* IPVS sync daemon data and function prototypes
   * (from ip_vs_sync.c)

   */

  int start_sync_thread(struct netns_ipvs *ipvs, struct ipvs_sync_daemon_cfg *cfg,

  		      int state);

  int stop_sync_thread(struct netns_ipvs *ipvs, int state);

  void ip_vs_sync_conn(struct netns_ipvs *ipvs, struct ip_vs_conn *cp, int pkts);

  /* IPVS rate estimator prototypes (from ip_vs_est.c) */

  void ip_vs_start_estimator(struct netns_ipvs *ipvs, struct ip_vs_stats *stats);
  void ip_vs_stop_estimator(struct netns_ipvs *ipvs, struct ip_vs_stats *stats);

  void ip_vs_zero_estimator(struct ip_vs_stats *stats);

  void ip_vs_read_estimator(struct ip_vs_kstats *dst, struct ip_vs_stats *stats);

  /* Various IPVS packet transmitters (from ip_vs_xmit.c) */

  int ip_vs_null_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
  		    struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
  int ip_vs_bypass_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
  		      struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
  int ip_vs_nat_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
  		   struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
  int ip_vs_tunnel_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
  		      struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
  int ip_vs_dr_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
  		  struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
  int ip_vs_icmp_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
  		    struct ip_vs_protocol *pp, int offset,
  		    unsigned int hooknum, struct ip_vs_iphdr *iph);
  void ip_vs_dest_dst_rcu_free(struct rcu_head *head);

  #ifdef CONFIG_IP_VS_IPV6

  int ip_vs_bypass_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
  			 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
  int ip_vs_nat_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
  		      struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
  int ip_vs_tunnel_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
  			 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
  int ip_vs_dr_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
  		     struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
  int ip_vs_icmp_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
  		       struct ip_vs_protocol *pp, int offset,
  		       unsigned int hooknum, struct ip_vs_iphdr *iph);

  #endif

  #ifdef CONFIG_SYSCTL

  /* This is a simple mechanism to ignore packets when
   * we are loaded. Just set ip_vs_drop_rate to 'n' and
   * we start to drop 1/rate of the packets

   */

  static inline int ip_vs_todrop(struct netns_ipvs *ipvs)

  {

  	if (!ipvs->drop_rate)
  		return 0;
  	if (--ipvs->drop_counter > 0)
  		return 0;
  	ipvs->drop_counter = ipvs->drop_rate;

  	return 1;
  }

  #else
  static inline int ip_vs_todrop(struct netns_ipvs *ipvs) { return 0; }
  #endif

  /* ip_vs_fwd_tag returns the forwarding tag of the connection */

  #define IP_VS_FWD_METHOD(cp)  (cp->flags & IP_VS_CONN_F_FWD_MASK)

  static inline char ip_vs_fwd_tag(struct ip_vs_conn *cp)

  {
  	char fwd;
  
  	switch (IP_VS_FWD_METHOD(cp)) {
  	case IP_VS_CONN_F_MASQ:
  		fwd = 'M'; break;
  	case IP_VS_CONN_F_LOCALNODE:
  		fwd = 'L'; break;
  	case IP_VS_CONN_F_TUNNEL:
  		fwd = 'T'; break;
  	case IP_VS_CONN_F_DROUTE:
  		fwd = 'R'; break;
  	case IP_VS_CONN_F_BYPASS:
  		fwd = 'B'; break;
  	default:
  		fwd = '?'; break;
  	}
  	return fwd;
  }

  void ip_vs_nat_icmp(struct sk_buff *skb, struct ip_vs_protocol *pp,
  		    struct ip_vs_conn *cp, int dir);

  
  #ifdef CONFIG_IP_VS_IPV6

  void ip_vs_nat_icmp_v6(struct sk_buff *skb, struct ip_vs_protocol *pp,
  		       struct ip_vs_conn *cp, int dir);

  #endif

  __sum16 ip_vs_checksum_complete(struct sk_buff *skb, int offset);

  static inline __wsum ip_vs_check_diff4(__be32 old, __be32 new, __wsum oldsum)

  {

  	__be32 diff[2] = { ~old, new };

  	return csum_partial(diff, sizeof(diff), oldsum);

  }

  #ifdef CONFIG_IP_VS_IPV6
  static inline __wsum ip_vs_check_diff16(const __be32 *old, const __be32 *new,
  					__wsum oldsum)
  {
  	__be32 diff[8] = { ~old[3], ~old[2], ~old[1], ~old[0],
  			    new[3],  new[2],  new[1],  new[0] };

  	return csum_partial(diff, sizeof(diff), oldsum);

  }
  #endif

  static inline __wsum ip_vs_check_diff2(__be16 old, __be16 new, __wsum oldsum)
  {
  	__be16 diff[2] = { ~old, new };

  	return csum_partial(diff, sizeof(diff), oldsum);

  }

  /* Forget current conntrack (unconfirmed) and attach notrack entry */

  static inline void ip_vs_notrack(struct sk_buff *skb)
  {
  #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
  	enum ip_conntrack_info ctinfo;

  	struct nf_conn *ct = nf_ct_get(skb, &ctinfo);

  
  	if (!ct || !nf_ct_is_untracked(ct)) {

  		nf_conntrack_put(skb->nfct);

  		skb->nfct = &nf_ct_untracked_get()->ct_general;
  		skb->nfctinfo = IP_CT_NEW;
  		nf_conntrack_get(skb->nfct);
  	}
  #endif
  }

  #ifdef CONFIG_IP_VS_NFCT

  /* Netfilter connection tracking
   * (from ip_vs_nfct.c)

   */

  static inline int ip_vs_conntrack_enabled(struct netns_ipvs *ipvs)

  {

  #ifdef CONFIG_SYSCTL

  	return ipvs->sysctl_conntrack;

  #else
  	return 0;
  #endif

  }

  void ip_vs_update_conntrack(struct sk_buff *skb, struct ip_vs_conn *cp,
  			    int outin);
  int ip_vs_confirm_conntrack(struct sk_buff *skb);
  void ip_vs_nfct_expect_related(struct sk_buff *skb, struct nf_conn *ct,
  			       struct ip_vs_conn *cp, u_int8_t proto,
  			       const __be16 port, int from_rs);
  void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp);

  
  #else

  static inline int ip_vs_conntrack_enabled(struct netns_ipvs *ipvs)

  {
  	return 0;
  }
  
  static inline void ip_vs_update_conntrack(struct sk_buff *skb,
  					  struct ip_vs_conn *cp, int outin)
  {
  }

  static inline int ip_vs_confirm_conntrack(struct sk_buff *skb)

  {
  	return NF_ACCEPT;
  }
  
  static inline void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp)
  {
  }

  #endif /* CONFIG_IP_VS_NFCT */

  /* Really using conntrack? */
  static inline bool ip_vs_conn_uses_conntrack(struct ip_vs_conn *cp,
  					     struct sk_buff *skb)
  {
  #ifdef CONFIG_IP_VS_NFCT
  	enum ip_conntrack_info ctinfo;
  	struct nf_conn *ct;
  
  	if (!(cp->flags & IP_VS_CONN_F_NFCT))
  		return false;
  	ct = nf_ct_get(skb, &ctinfo);
  	if (ct && !nf_ct_is_untracked(ct))
  		return true;
  #endif
  	return false;
  }

  static inline int

  ip_vs_dest_conn_overhead(struct ip_vs_dest *dest)
  {

  	/* We think the overhead of processing active connections is 256

  	 * times higher than that of inactive connections in average. (This
  	 * 256 times might not be accurate, we will change it later) We
  	 * use the following formula to estimate the overhead now:
  	 *		  dest->activeconns*256 + dest->inactconns
  	 */
  	return (atomic_read(&dest->activeconns) << 8) +
  		atomic_read(&dest->inactconns);
  }

  #endif	/* _NET_IP_VS_H */