Release 4.12 include/net/ip_vs.h

/* 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/refcount.h>             /* for struct refcount_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;
}

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/* 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
}

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/* 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);
}

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/* 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;
}

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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);
}

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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);
}

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static inline bool

ip_vs_iph_inverse(const struct ip_vs_iphdr *iph)
{
	return !!(iph->hdr_flags & IP_VS_HDR_INVERSE);
}

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static inline bool

ip_vs_iph_icmp(const struct ip_vs_iphdr *iph)
{
	return !!(iph->hdr_flags & IP_VS_HDR_ICMP);
}

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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;
}

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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;
}

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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;
}

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#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];
}

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#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

/* 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 */
	
refcount_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 */

	
refcount_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];
}

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

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

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

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

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

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

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

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

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static inline unsigned long sysctl_sync_qlen_max(struct netns_ipvs *ipvs)
{
	return ipvs->sysctl_sync_qlen_max;
}

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

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

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

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

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

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

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

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#else



static inline int sysctl_sync_threshold(struct netns_ipvs *ipvs)
{
	return DEFAULT_SYNC_THRESHOLD;
}

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static inline int sysctl_sync_period(struct netns_ipvs *ipvs)
{
	return DEFAULT_SYNC_PERIOD;
}

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

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

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

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

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

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

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

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static inline unsigned long sysctl_sync_qlen_max(struct netns_ipvs *ipvs)
{
	return IPVS_SYNC_QLEN_MAX;
}

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

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

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

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

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

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Alex Gartrell
15
100.00%
1
100.00%
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15
100.00%
1
100.00%



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

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

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Eric W. Biedermann
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15
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#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;
}

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Simon Horman
64
67.37%
2
22.22%
Julius Volz
11
11.58%
1
11.11%
Hans Schillstrom
7
7.37%
1
11.11%
Wensong Zhang
5
5.26%
1
11.11%
Eric W. Biedermann
4
4.21%
2
22.22%
Al Viro
2
2.11%
1
11.11%
Julian Anastasov
2
2.11%
1
11.11%
Total
95
100.00%
9
100.00%

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 refcount_inc_not_zero(&cp->refcnt);
}

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20
95.24%
1
50.00%
Elena Reshetova
1
4.76%
1
50.00%
Total
21
100.00%
2
100.00%

/* put back the conn without restarting its timer */


static inline void __ip_vs_conn_put(struct ip_vs_conn *cp)
{
	smp_mb__before_atomic();
	refcount_dec(&cp->refcnt);
}
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Wensong Zhang
19
82.61%
1
25.00%
Julian Anastasov
2
8.70%
1
25.00%
Elena Reshetova
1
4.35%
1
25.00%
Peter Zijlstra
1
4.35%
1
25.00%
Total
23
100.00%
4
100.00%

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\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);
}

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Wensong Zhang
150
78.12%
1
50.00%
Julius Volz
42
21.88%
1
50.00%
Total
192
100.00%
2
100.00%


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);
}

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Wensong Zhang
106
79.10%
1
50.00%
Julius Volz
28
20.90%
1
50.00%
Total
134
100.00%
2
100.00%

/* 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);
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)
{
	refcount_inc(&dest->refcnt);
}

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Julian Anastasov
19
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1
5.00%
1
50.00%
Total
20
100.00%
2
100.00%



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

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Julian Anastasov
21
91.30%
1
33.33%
Elena Reshetova
1
4.35%
1
33.33%
Peter Zijlstra
1
4.35%
1
33.33%
Total
23
100.00%
3
100.00%



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

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Julian Anastasov
26
96.30%
1
50.00%
Elena Reshetova
1
3.70%
1
50.00%
Total
27
100.00%
2
100.00%

/* 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;
}
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Wensong Zhang
28
62.22%
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Hans Schillstrom
17
37.78%
1
50.00%
Total
45
100.00%
2
100.00%

#else


static inline int ip_vs_todrop(struct netns_ipvs *ipvs) { return 0; }
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100.00%

#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;
}

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Wensong Zhang
71
97.26%
1
50.00%
Adrian Bunk
2
2.74%
1
50.00%
Total
73
100.00%
2
100.00%

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);
}

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Wensong Zhang
33
78.57%
1
50.00%
Al Viro
9
21.43%
1
50.00%
Total
42
100.00%
2
100.00%

#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);
}
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85
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1
100.00%

#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);
}

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Al Viro
39
92.86%
1
50.00%
Wensong Zhang
3
7.14%
1
50.00%
Total
42
100.00%
2
100.00%

/* 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_conntrack_put(&ct->ct_general);
		nf_ct_set(skb, NULL, IP_CT_UNTRACKED);
	}
#endif
}

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Julian Anastasov
51
78.46%
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20.00%
Florian Westphal
12
18.46%
3
60.00%
Lin Ming
2
3.08%
1
20.00%
Total
65
100.00%
5
100.00%

#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
}

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Julian Anastasov
10
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33.33%
Simon Horman
10
37.04%
1
33.33%
Hans Schillstrom
7
25.93%
1
33.33%
Total
27
100.00%
3
100.00%

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;
}

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4
26.67%
1
50.00%
Total
15
100.00%
2
100.00%



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

Contributors
Person
Tokens
Prop
Commits
CommitProp
Julian Anastasov
19
100.00%
1
100.00%
Total
19
100.00%
1
100.00%



static inline int ip_vs_confirm_conntrack(struct sk_buff *skb)
{
	return NF_ACCEPT;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Julian Anastasov
15
100.00%
1
100.00%
Total
15
100.00%
1
100.00%



static inline void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp)
{
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Julian Anastasov
11
100.00%
1
100.00%
Total
11
100.00%
1
100.00%

#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)
		return true;
#endif
	return false;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Julian Anastasov
65
100.00%
1
100.00%
Total
65
100.00%
1
100.00%


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);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Changli Gao
33
97.06%
1
50.00%
Simon Horman
1
2.94%
1
50.00%
Total
34
100.00%
2
100.00%

#endif	/* _NET_IP_VS_H */
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Wensong Zhang
2172
32.15%
1
0.56%
Julian Anastasov
1410
20.87%
43
24.16%
Julius Volz
800
11.84%
12
6.74%
Simon Horman
543
8.04%
15
8.43%
Hans Schillstrom
417
6.17%
21
11.80%
Alex Gartrell
344
5.09%
8
4.49%
Jesper Dangaard Brouer
244
3.61%
6
3.37%
Pablo Neira Ayuso
165
2.44%
2
1.12%
Eric W. Biedermann
127
1.88%
29
16.29%
Marco Angaroni
104
1.54%
2
1.12%
Alexander Frolkin
78
1.15%
1
0.56%
Al Viro
58
0.86%
3
1.69%
Sven Wegener
43
0.64%
3
1.69%
Marcelo Ricardo Leitner
35
0.52%
1
0.56%
Changli Gao
34
0.50%
2
1.12%
Rumen G. Bogdanovski
32
0.47%
2
1.12%
Venkata Mohan Reddy
27
0.40%
1
0.56%
Arnaldo Carvalho de Melo
15
0.22%
1
0.56%
Patrick Schaaf
14
0.21%
1
0.56%
Florian Westphal
12
0.18%
3
1.69%
Hannes Eder
12
0.18%
2
1.12%
Elena Reshetova
11
0.16%
1
0.56%
Paul Gortmaker
11
0.16%
2
1.12%
Eric Dumazet
8
0.12%
1
0.56%
Zhang Yanfei
8
0.12%
1
0.56%
Harvey Harrison
5
0.07%
3
1.69%
Catalin(ux aka Dino) M. Boie
5
0.07%
1
0.56%
Herbert Xu
4
0.06%
1
0.56%
KOVACS Krisztian
3
0.04%
1
0.56%
Alexey Dobriyan
3
0.04%
1
0.56%
Pavel Emelyanov
3
0.04%
1
0.56%
Peter Zijlstra
2
0.03%
1
0.56%
Adrian Bunk
2
0.03%
1
0.56%
Lin Ming
2
0.03%
1
0.56%
David S. Miller
1
0.01%
1
0.56%
Arun Sharma
1
0.01%
1
0.56%
Jiri Pirko
1
0.01%
1
0.56%
Krzysztof Wilczynski
0.00%
0
0.00%
Total
6756
100.00%
178
100.00%
Directory: include/net

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