dirty fix to merging

1 files changed, 1426 insertions, 0 deletions

diff --git a/include/net/ip_vs.h b/include/net/ip_vs.h
new file mode 100644
index 00000000..72522f08
--- /dev/null
+++ b/include/net/ip_vs.h
@@ -0,0 +1,1426 @@
+/*
+ *      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/sysctl.h>               /* for ctl_path */
+#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 defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
+#include <net/netfilter/nf_conntrack.h>
+#endif
+#include <net/net_namespace.h>		/* Netw namespace */
+
+/*
+ * Generic access of ipvs struct
+ */
+static inline struct netns_ipvs *net_ipvs(struct net* net)
+{
+	return net->ipvs;
+}
+/*
+ * Get net ptr from skb in traffic cases
+ * use skb_sknet when call is from userland (ioctl or netlink)
+ */
+static inline struct net *skb_net(const struct sk_buff *skb)
+{
+#ifdef CONFIG_NET_NS
+#ifdef CONFIG_IP_VS_DEBUG
+	/*
+	 * This is used for debug only.
+	 * Start with the most likely hit
+	 * End with BUG
+	 */
+	if (likely(skb->dev && skb->dev->nd_net))
+		return dev_net(skb->dev);
+	if (skb_dst(skb) && skb_dst(skb)->dev)
+		return dev_net(skb_dst(skb)->dev);
+	WARN(skb->sk, "Maybe skb_sknet should be used in %s() at line:%d\n",
+		      __func__, __LINE__);
+	if (likely(skb->sk && skb->sk->sk_net))
+		return sock_net(skb->sk);
+	pr_err("There is no net ptr to find in the skb in %s() line:%d\n",
+		__func__, __LINE__);
+	BUG();
+#else
+	return dev_net(skb->dev ? : skb_dst(skb)->dev);
+#endif
+#else
+	return &init_net;
+#endif
+}
+
+static inline struct net *skb_sknet(const struct sk_buff *skb)
+{
+#ifdef CONFIG_NET_NS
+#ifdef CONFIG_IP_VS_DEBUG
+	/* Start with the most likely hit */
+	if (likely(skb->sk && skb->sk->sk_net))
+		return sock_net(skb->sk);
+	WARN(skb->dev, "Maybe skb_net should be used instead in %s() line:%d\n",
+		       __func__, __LINE__);
+	if (likely(skb->dev && skb->dev->nd_net))
+		return dev_net(skb->dev);
+	pr_err("There is no net ptr to find in the skb in %s() line:%d\n",
+		__func__, __LINE__);
+	BUG();
+#else
+	return sock_net(skb->sk);
+#endif
+#else
+	return &init_net;
+#endif
+}
+/*
+ * 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 len;
+	__u8 protocol;
+	union nf_inet_addr saddr;
+	union nf_inet_addr daddr;
+};
+
+static inline void
+ip_vs_fill_iphdr(int af, const void *nh, struct ip_vs_iphdr *iphdr)
+{
+#ifdef CONFIG_IP_VS_IPV6
+	if (af == AF_INET6) {
+		const struct ipv6hdr *iph = nh;
+		iphdr->len = sizeof(struct ipv6hdr);
+		iphdr->protocol = iph->nexthdr;
+		iphdr->saddr.in6 = iph->saddr;
+		iphdr->daddr.in6 = iph->daddr;
+	} else
+#endif
+	{
+		const struct iphdr *iph = nh;
+		iphdr->len = iph->ihl * 4;
+		iphdr->protocol = iph->protocol;
+		iphdr->saddr.ip = iph->saddr;
+		iphdr->daddr.ip = iph->daddr;
+	}
+}
+
+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 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>
+
+extern 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, "[%pI6]",
+			       &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\n"),	\
+			       __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\n"),	\
+			       __func__, __FILE__, __LINE__);		\
+	} while (0)
+#else
+#define EnterFunction(level)   do {} while (0)
+#define LeaveFunction(level)   do {} while (0)
+#endif
+
+#define	IP_VS_WAIT_WHILE(expr)	while (expr) { cpu_relax(); }
+
+
+/*
+ *      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_INIT_CLI,
+	IP_VS_SCTP_S_INIT_SER,
+	IP_VS_SCTP_S_INIT_ACK_CLI,
+	IP_VS_SCTP_S_INIT_ACK_SER,
+	IP_VS_SCTP_S_ECHO_CLI,
+	IP_VS_SCTP_S_ECHO_SER,
+	IP_VS_SCTP_S_ESTABLISHED,
+	IP_VS_SCTP_S_SHUT_CLI,
+	IP_VS_SCTP_S_SHUT_SER,
+	IP_VS_SCTP_S_SHUT_ACK_CLI,
+	IP_VS_SCTP_S_SHUT_ACK_SER,
+	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 {
+	__u32		conns;		/* connections scheduled */
+	__u32		inpkts;		/* incoming packets */
+	__u32		outpkts;	/* outgoing packets */
+	__u64		inbytes;	/* incoming bytes */
+	__u64		outbytes;	/* outgoing bytes */
+};
+/*
+ * Stats per cpu
+ */
+struct ip_vs_cpu_stats {
+	struct ip_vs_counters   ustats;
+	struct u64_stats_sync   syncp;
+};
+
+/*
+ *	IPVS statistics objects
+ */
+struct ip_vs_estimator {
+	struct list_head	list;
+
+	u64			last_inbytes;
+	u64			last_outbytes;
+	u32			last_conns;
+	u32			last_inpkts;
+	u32			last_outpkts;
+
+	u32			cps;
+	u32			inpps;
+	u32			outpps;
+	u32			inbps;
+	u32			outbps;
+};
+
+struct ip_vs_stats {
+	struct ip_vs_stats_user	ustats;		/* statistics */
+	struct ip_vs_estimator	est;		/* estimator */
+	struct ip_vs_cpu_stats	*cpustats;	/* per cpu counters */
+	spinlock_t		lock;		/* spin lock */
+	struct ip_vs_stats_user	ustats0;	/* 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 net *net, struct ip_vs_proto_data *pd);
+
+	void (*exit_netns)(struct net *net, struct ip_vs_proto_data *pd);
+
+	int (*conn_schedule)(int af, struct sk_buff *skb,
+			     struct ip_vs_proto_data *pd,
+			     int *verdict, struct ip_vs_conn **cpp);
+
+	struct ip_vs_conn *
+	(*conn_in_get)(int af,
+		       const struct sk_buff *skb,
+		       const struct ip_vs_iphdr *iph,
+		       unsigned int proto_off,
+		       int inverse);
+
+	struct ip_vs_conn *
+	(*conn_out_get)(int af,
+			const struct sk_buff *skb,
+			const struct ip_vs_iphdr *iph,
+			unsigned int proto_off,
+			int inverse);
+
+	int (*snat_handler)(struct sk_buff *skb,
+			    struct ip_vs_protocol *pp, struct ip_vs_conn *cp);
+
+	int (*dnat_handler)(struct sk_buff *skb,
+			    struct ip_vs_protocol *pp, struct ip_vs_conn *cp);
+
+	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 net *net, struct ip_vs_app *inc);
+
+	void (*unregister_app)(struct net *net, 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;
+};
+
+extern struct ip_vs_protocol   *ip_vs_proto_get(unsigned short proto);
+extern struct ip_vs_proto_data *ip_vs_proto_data_get(struct net *net,
+						     unsigned short proto);
+
+struct ip_vs_conn_param {
+	struct net			*net;
+	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 */
+#ifdef CONFIG_NET_NS
+	struct net              *net;           /* Name space */
+#endif
+	/* Protocol, addresses and port numbers */
+	u16                     af;             /* address family */
+	__be16                  cport;
+	__be16                  vport;
+	__be16                  dport;
+	__u32                   fwmark;         /* Fire wall mark from skb */
+	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) */
+
+	/* 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
+						 */
+
+	/* 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);
+
+	/* 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;
+};
+
+/*
+ *  To save some memory in conn table when name space is disabled.
+ */
+static inline struct net *ip_vs_conn_net(const struct ip_vs_conn *cp)
+{
+#ifdef CONFIG_NET_NS
+	return cp->net;
+#else
+	return &init_net;
+#endif
+}
+static inline void ip_vs_conn_net_set(struct ip_vs_conn *cp, struct net *net)
+{
+#ifdef CONFIG_NET_NS
+	cp->net = net;
+#endif
+}
+
+static inline int ip_vs_conn_net_eq(const struct ip_vs_conn *cp,
+				    struct net *net)
+{
+#ifdef CONFIG_NET_NS
+	return cp->net == net;
+#else
+	return 1;
+#endif
+}
+
+/*
+ *	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 */
+	u16			port;
+	u32			fwmark;		/* firwall mark of service */
+
+	/* virtual service options */
+	char			*sched_name;
+	char			*pe_name;
+	unsigned		flags;		/* virtual service flags */
+	unsigned		timeout;	/* persistent timeout in sec */
+	u32			netmask;	/* persistent netmask */
+};
+
+
+struct ip_vs_dest_user_kern {
+	/* destination server address */
+	union nf_inet_addr	addr;
+	u16			port;
+
+	/* real server options */
+	unsigned		conn_flags;	/* connection flags */
+	int			weight;		/* destination weight */
+
+	/* thresholds for active connections */
+	u32			u_threshold;	/* upper threshold */
+	u32			l_threshold;	/* lower threshold */
+};
+
+
+/*
+ *	The information about the virtual service offered to the net
+ *	and the forwarding entries
+ */
+struct ip_vs_service {
+	struct list_head	s_list;   /* for normal service table */
+	struct list_head	f_list;   /* for fwmark-based service table */
+	atomic_t		refcnt;   /* reference counter */
+	atomic_t		usecnt;   /* use 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		flags;	  /* service status flags */
+	unsigned		timeout;  /* persistent timeout in ticks */
+	__be32			netmask;  /* grouping granularity */
+	struct net		*net;
+
+	struct list_head	destinations;  /* real server d-linked list */
+	__u32			num_dests;     /* number of servers */
+	struct ip_vs_stats      stats;         /* statistics for the service */
+	struct ip_vs_app	*inc;	  /* bind conns to this app inc */
+
+	/* for scheduling */
+	struct ip_vs_scheduler	*scheduler;    /* bound scheduler object */
+	rwlock_t		sched_lock;    /* lock sched_data */
+	void			*sched_data;   /* scheduler application data */
+
+	/* alternate persistence engine */
+	struct ip_vs_pe		*pe;
+};
+
+
+/*
+ *	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 list_head	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	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 */
+
+	/* 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 dst_entry	*dst_cache;	/* destination cache entry */
+	u32			dst_rtos;	/* RT_TOS(tos) for dst */
+	u32			dst_cookie;
+	union nf_inet_addr	dst_saddr;
+
+	/* for virtual service */
+	struct ip_vs_service	*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 */
+};
+
+
+/*
+ *	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 */
+	int (*done_service)(struct ip_vs_service *svc);
+	/* scheduler updating service */
+	int (*update_service)(struct ip_vs_service *svc);
+
+	/* selecting a server from the given service */
+	struct ip_vs_dest* (*schedule)(struct ip_vs_service *svc,
+				       const struct sk_buff *skb);
+};
+
+/* 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);
+};
+
+/*
+ *	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 */
+
+	/*
+	 * 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, unsigned int proto_off,
+		       int inverse);
+
+	struct ip_vs_conn *
+	(*conn_out_get)(const struct sk_buff *skb, struct ip_vs_app *app,
+			const struct iphdr *iph, unsigned int proto_off,
+			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);
+};
+
+/* 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 list_head	rs_table[IP_VS_RTAB_SIZE];
+	/* ip_vs_app */
+	struct list_head	app_list;
+	/* ip_vs_ftp */
+	struct ip_vs_app	*ftp_app;
+	/* 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];
+	spinlock_t		tcp_app_lock;
+#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];
+	spinlock_t		udp_app_lock;
+#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];
+	spinlock_t		sctp_app_lock;
+#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 */
+
+	rwlock_t		rs_lock;         /* real services table */
+	/* Trash for destinations */
+	struct list_head	dest_trash;
+	/* Service counters */
+	atomic_t		ftpsvc_counter;
+	atomic_t		nullsvc_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_cache_bypass;
+	int			sysctl_expire_nodest_conn;
+	int			sysctl_expire_quiescent_template;
+	int			sysctl_sync_threshold[2];
+	int			sysctl_nat_icmp_send;
+
+	/* 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 */
+	struct list_head	sync_queue;
+	spinlock_t		sync_lock;
+	struct ip_vs_sync_buff  *sync_buff;
+	spinlock_t		sync_buff_lock;
+	struct sockaddr_in	sync_mcast_addr;
+	struct task_struct	*master_thread;
+	struct task_struct	*backup_thread;
+	int			send_mesg_maxlen;
+	int			recv_mesg_maxlen;
+	volatile int		sync_state;
+	volatile int		master_syncid;
+	volatile int		backup_syncid;
+	struct mutex		sync_mutex;
+	/* multicast interface name */
+	char			master_mcast_ifn[IP_VS_IFNAME_MAXLEN];
+	char			backup_mcast_ifn[IP_VS_IFNAME_MAXLEN];
+	/* net name space ptr */
+	struct net		*net;            /* Needed by timer routines */
+};
+
+#define DEFAULT_SYNC_THRESHOLD	3
+#define DEFAULT_SYNC_PERIOD	50
+#define DEFAULT_SYNC_VER	1
+
+#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 ipvs->sysctl_sync_threshold[1];
+}
+
+static inline int sysctl_sync_ver(struct netns_ipvs *ipvs)
+{
+	return ipvs->sysctl_sync_ver;
+}
+
+#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 int sysctl_sync_ver(struct netns_ipvs *ipvs)
+{
+	return DEFAULT_SYNC_VER;
+}
+
+#endif
+
+/*
+ *      IPVS core functions
+ *      (from ip_vs_core.c)
+ */
+extern const char *ip_vs_proto_name(unsigned proto);
+extern void ip_vs_init_hash_table(struct list_head *table, int rows);
+#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 net *net, 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->net = net;
+	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(int af, const struct sk_buff *skb,
+					    const struct ip_vs_iphdr *iph,
+					    unsigned int proto_off,
+					    int inverse);
+
+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(int af, const struct sk_buff *skb,
+					     const struct ip_vs_iphdr *iph,
+					     unsigned int proto_off,
+					     int inverse);
+
+/* put back the conn without restarting its timer */
+static inline void __ip_vs_conn_put(struct ip_vs_conn *cp)
+{
+	atomic_dec(&cp->refcnt);
+}
+extern void ip_vs_conn_put(struct ip_vs_conn *cp);
+extern 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,
+				  const union nf_inet_addr *daddr,
+				  __be16 dport, unsigned flags,
+				  struct ip_vs_dest *dest, __u32 fwmark);
+extern void ip_vs_conn_expire_now(struct ip_vs_conn *cp);
+
+extern const char * ip_vs_state_name(__u16 proto, int state);
+
+extern void ip_vs_tcp_conn_listen(struct net *net, struct ip_vs_conn *cp);
+extern int ip_vs_check_template(struct ip_vs_conn *ct);
+extern void ip_vs_random_dropentry(struct net *net);
+extern int ip_vs_conn_init(void);
+extern 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\n",
+			      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\n",
+		      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\n",
+			      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\n",
+			      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\n",
+		      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
+ */
+extern int ip_vs_estimator_net_init(struct net *net);
+extern int ip_vs_control_net_init(struct net *net);
+extern int ip_vs_protocol_net_init(struct net *net);
+extern int ip_vs_app_net_init(struct net *net);
+extern int ip_vs_conn_net_init(struct net *net);
+extern int ip_vs_sync_net_init(struct net *net);
+extern void ip_vs_conn_net_cleanup(struct net *net);
+extern void ip_vs_app_net_cleanup(struct net *net);
+extern void ip_vs_protocol_net_cleanup(struct net *net);
+extern void ip_vs_control_net_cleanup(struct net *net);
+extern void ip_vs_estimator_net_cleanup(struct net *net);
+extern void ip_vs_sync_net_cleanup(struct net *net);
+extern void ip_vs_service_net_cleanup(struct net *net);
+
+/*
+ *      IPVS application functions
+ *      (from ip_vs_app.c)
+ */
+#define IP_VS_APP_MAX_PORTS  8
+extern int register_ip_vs_app(struct net *net, struct ip_vs_app *app);
+extern void unregister_ip_vs_app(struct net *net, struct ip_vs_app *app);
+extern int ip_vs_bind_app(struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
+extern void ip_vs_unbind_app(struct ip_vs_conn *cp);
+extern int register_ip_vs_app_inc(struct net *net, struct ip_vs_app *app,
+				  __u16 proto, __u16 port);
+extern int ip_vs_app_inc_get(struct ip_vs_app *inc);
+extern void ip_vs_app_inc_put(struct ip_vs_app *inc);
+
+extern int ip_vs_app_pkt_out(struct ip_vs_conn *, struct sk_buff *skb);
+extern int ip_vs_app_pkt_in(struct ip_vs_conn *, struct sk_buff *skb);
+
+void ip_vs_bind_pe(struct ip_vs_service *svc, struct ip_vs_pe *pe);
+void ip_vs_unbind_pe(struct ip_vs_service *svc);
+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)
+ */
+extern int ip_vs_protocol_init(void);
+extern void ip_vs_protocol_cleanup(void);
+extern void ip_vs_protocol_timeout_change(struct netns_ipvs *ipvs, int flags);
+extern int *ip_vs_create_timeout_table(int *table, int size);
+extern int
+ip_vs_set_state_timeout(int *table, int num, const char *const *names,
+			const char *name, int to);
+extern 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)
+ */
+extern int register_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
+extern int unregister_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
+extern int ip_vs_bind_scheduler(struct ip_vs_service *svc,
+				struct ip_vs_scheduler *scheduler);
+extern int ip_vs_unbind_scheduler(struct ip_vs_service *svc);
+extern struct ip_vs_scheduler *ip_vs_scheduler_get(const char *sched_name);
+extern void ip_vs_scheduler_put(struct ip_vs_scheduler *scheduler);
+extern struct ip_vs_conn *
+ip_vs_schedule(struct ip_vs_service *svc, struct sk_buff *skb,
+	       struct ip_vs_proto_data *pd, int *ignored);
+extern int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb,
+			struct ip_vs_proto_data *pd);
+
+extern 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 const struct ctl_path net_vs_ctl_path[];
+extern int sysctl_ip_vs_sync_ver;
+
+extern void ip_vs_sync_switch_mode(struct net *net, int mode);
+extern struct ip_vs_service *
+ip_vs_service_get(struct net *net, int af, __u32 fwmark, __u16 protocol,
+		  const union nf_inet_addr *vaddr, __be16 vport);
+
+static inline void ip_vs_service_put(struct ip_vs_service *svc)
+{
+	atomic_dec(&svc->usecnt);
+}
+
+extern struct ip_vs_dest *
+ip_vs_lookup_real_service(struct net *net, int af, __u16 protocol,
+			  const union nf_inet_addr *daddr, __be16 dport);
+
+extern int ip_vs_use_count_inc(void);
+extern void ip_vs_use_count_dec(void);
+extern int ip_vs_register_nl_ioctl(void);
+extern void ip_vs_unregister_nl_ioctl(void);
+extern int ip_vs_control_init(void);
+extern void ip_vs_control_cleanup(void);
+extern struct ip_vs_dest *
+ip_vs_find_dest(struct net *net, int af, const union nf_inet_addr *daddr,
+		__be16 dport, const union nf_inet_addr *vaddr, __be16 vport,
+		__u16 protocol, __u32 fwmark, __u32 flags);
+extern struct ip_vs_dest *ip_vs_try_bind_dest(struct ip_vs_conn *cp);
+
+
+/*
+ *      IPVS sync daemon data and function prototypes
+ *      (from ip_vs_sync.c)
+ */
+extern int start_sync_thread(struct net *net, int state, char *mcast_ifn,
+			     __u8 syncid);
+extern int stop_sync_thread(struct net *net, int state);
+extern void ip_vs_sync_conn(struct net *net, struct ip_vs_conn *cp);
+
+
+/*
+ *      IPVS rate estimator prototypes (from ip_vs_est.c)
+ */
+extern void ip_vs_start_estimator(struct net *net, struct ip_vs_stats *stats);
+extern void ip_vs_stop_estimator(struct net *net, struct ip_vs_stats *stats);
+extern void ip_vs_zero_estimator(struct ip_vs_stats *stats);
+extern void ip_vs_read_estimator(struct ip_vs_stats_user *dst,
+				 struct ip_vs_stats *stats);
+
+/*
+ *	Various IPVS packet transmitters (from ip_vs_xmit.c)
+ */
+extern int ip_vs_null_xmit
+(struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
+extern int ip_vs_bypass_xmit
+(struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
+extern int ip_vs_nat_xmit
+(struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
+extern int ip_vs_tunnel_xmit
+(struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
+extern int ip_vs_dr_xmit
+(struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
+extern int ip_vs_icmp_xmit
+(struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp,
+ int offset, unsigned int hooknum);
+extern void ip_vs_dst_reset(struct ip_vs_dest *dest);
+
+#ifdef CONFIG_IP_VS_IPV6
+extern int ip_vs_bypass_xmit_v6
+(struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
+extern int ip_vs_nat_xmit_v6
+(struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
+extern int ip_vs_tunnel_xmit_v6
+(struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
+extern int ip_vs_dr_xmit_v6
+(struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
+extern 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);
+#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;
+}
+
+extern 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
+extern void ip_vs_nat_icmp_v6(struct sk_buff *skb, struct ip_vs_protocol *pp,
+			      struct ip_vs_conn *cp, int dir);
+#endif
+
+extern __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_reset(skb);
+		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
+}
+
+extern void ip_vs_update_conntrack(struct sk_buff *skb, struct ip_vs_conn *cp,
+				   int outin);
+extern int ip_vs_confirm_conntrack(struct sk_buff *skb);
+extern 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);
+extern 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)
+{
+}
+/* CONFIG_IP_VS_NFCT */
+#endif
+
+static inline unsigned 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 */