1/* SPDX-License-Identifier: GPL-2.0 */
   2/* IP Virtual Server
   3 * data structure and functionality definitions
   4 */
   5
   6#ifndef _NET_IP_VS_H
   7#define _NET_IP_VS_H
   8
   9#include <linux/ip_vs.h>                /* definitions shared with userland */
  10
  11#include <asm/types.h>                  /* for __uXX types */
  12
  13#include <linux/list.h>                 /* for struct list_head */
  14#include <linux/spinlock.h>             /* for struct rwlock_t */
  15#include <linux/atomic.h>               /* for struct atomic_t */
  16#include <linux/refcount.h>             /* for struct refcount_t */
  17#include <linux/workqueue.h>
  18
  19#include <linux/compiler.h>
  20#include <linux/timer.h>
  21#include <linux/bug.h>
  22
  23#include <net/checksum.h>
  24#include <linux/netfilter.h>		/* for union nf_inet_addr */
  25#include <linux/ip.h>
  26#include <linux/ipv6.h>			/* for struct ipv6hdr */
  27#include <net/ipv6.h>
 
 
 
  28#if IS_ENABLED(CONFIG_NF_CONNTRACK)
  29#include <net/netfilter/nf_conntrack.h>
  30#endif
  31#include <net/net_namespace.h>		/* Netw namespace */
  32
  33#define IP_VS_HDR_INVERSE	1
  34#define IP_VS_HDR_ICMP		2
  35
  36/* Generic access of ipvs struct */
  37static inline struct netns_ipvs *net_ipvs(struct net* net)
  38{
  39	return net->ipvs;
  40}
  41
  42/* Connections' size value needed by ip_vs_ctl.c */
  43extern int ip_vs_conn_tab_size;
  44
  45struct ip_vs_iphdr {
  46	int hdr_flags;	/* ipvs flags */
  47	__u32 off;	/* Where IP or IPv4 header starts */
  48	__u32 len;	/* IPv4 simply where L4 starts
  49			 * IPv6 where L4 Transport Header starts */
  50	__u16 fragoffs; /* IPv6 fragment offset, 0 if first frag (or not frag)*/
  51	__s16 protocol;
  52	__s32 flags;
  53	union nf_inet_addr saddr;
  54	union nf_inet_addr daddr;
  55};
  56
  57static inline void *frag_safe_skb_hp(const struct sk_buff *skb, int offset,
  58				      int len, void *buffer)
  59{
  60	return skb_header_pointer(skb, offset, len, buffer);
  61}
  62
  63/* This function handles filling *ip_vs_iphdr, both for IPv4 and IPv6.
  64 * IPv6 requires some extra work, as finding proper header position,
  65 * depend on the IPv6 extension headers.
  66 */
  67static inline int
  68ip_vs_fill_iph_skb_off(int af, const struct sk_buff *skb, int offset,
  69		       int hdr_flags, struct ip_vs_iphdr *iphdr)
  70{
  71	iphdr->hdr_flags = hdr_flags;
  72	iphdr->off = offset;
  73
  74#ifdef CONFIG_IP_VS_IPV6
  75	if (af == AF_INET6) {
  76		struct ipv6hdr _iph;
  77		const struct ipv6hdr *iph = skb_header_pointer(
  78			skb, offset, sizeof(_iph), &_iph);
  79		if (!iph)
  80			return 0;
  81
  82		iphdr->saddr.in6 = iph->saddr;
  83		iphdr->daddr.in6 = iph->daddr;
  84		/* ipv6_find_hdr() updates len, flags */
  85		iphdr->len	 = offset;
  86		iphdr->flags	 = 0;
  87		iphdr->protocol  = ipv6_find_hdr(skb, &iphdr->len, -1,
  88						 &iphdr->fragoffs,
  89						 &iphdr->flags);
  90		if (iphdr->protocol < 0)
  91			return 0;
  92	} else
  93#endif
  94	{
  95		struct iphdr _iph;
  96		const struct iphdr *iph = skb_header_pointer(
  97			skb, offset, sizeof(_iph), &_iph);
  98		if (!iph)
  99			return 0;
 100
 101		iphdr->len	= offset + iph->ihl * 4;
 102		iphdr->fragoffs	= 0;
 103		iphdr->protocol	= iph->protocol;
 104		iphdr->saddr.ip	= iph->saddr;
 105		iphdr->daddr.ip	= iph->daddr;
 106	}
 107
 108	return 1;
 109}
 110
 111static inline int
 112ip_vs_fill_iph_skb_icmp(int af, const struct sk_buff *skb, int offset,
 113			bool inverse, struct ip_vs_iphdr *iphdr)
 114{
 115	int hdr_flags = IP_VS_HDR_ICMP;
 116
 117	if (inverse)
 118		hdr_flags |= IP_VS_HDR_INVERSE;
 119
 120	return ip_vs_fill_iph_skb_off(af, skb, offset, hdr_flags, iphdr);
 121}
 122
 123static inline int
 124ip_vs_fill_iph_skb(int af, const struct sk_buff *skb, bool inverse,
 125		   struct ip_vs_iphdr *iphdr)
 126{
 127	int hdr_flags = 0;
 128
 129	if (inverse)
 130		hdr_flags |= IP_VS_HDR_INVERSE;
 131
 132	return ip_vs_fill_iph_skb_off(af, skb, skb_network_offset(skb),
 133				      hdr_flags, iphdr);
 134}
 135
 136static inline bool
 137ip_vs_iph_inverse(const struct ip_vs_iphdr *iph)
 138{
 139	return !!(iph->hdr_flags & IP_VS_HDR_INVERSE);
 140}
 141
 142static inline bool
 143ip_vs_iph_icmp(const struct ip_vs_iphdr *iph)
 144{
 145	return !!(iph->hdr_flags & IP_VS_HDR_ICMP);
 146}
 147
 148static inline void ip_vs_addr_copy(int af, union nf_inet_addr *dst,
 149				   const union nf_inet_addr *src)
 150{
 151#ifdef CONFIG_IP_VS_IPV6
 152	if (af == AF_INET6)
 153		dst->in6 = src->in6;
 154	else
 155#endif
 156	dst->ip = src->ip;
 157}
 158
 159static inline void ip_vs_addr_set(int af, union nf_inet_addr *dst,
 160				  const union nf_inet_addr *src)
 161{
 162#ifdef CONFIG_IP_VS_IPV6
 163	if (af == AF_INET6) {
 164		dst->in6 = src->in6;
 165		return;
 166	}
 167#endif
 168	dst->ip = src->ip;
 169	dst->all[1] = 0;
 170	dst->all[2] = 0;
 171	dst->all[3] = 0;
 172}
 173
 174static inline int ip_vs_addr_equal(int af, const union nf_inet_addr *a,
 175				   const union nf_inet_addr *b)
 176{
 177#ifdef CONFIG_IP_VS_IPV6
 178	if (af == AF_INET6)
 179		return ipv6_addr_equal(&a->in6, &b->in6);
 180#endif
 181	return a->ip == b->ip;
 182}
 183
 184#ifdef CONFIG_IP_VS_DEBUG
 185#include <linux/net.h>
 186
 187int ip_vs_get_debug_level(void);
 188
 189static inline const char *ip_vs_dbg_addr(int af, char *buf, size_t buf_len,
 190					 const union nf_inet_addr *addr,
 191					 int *idx)
 192{
 193	int len;
 194#ifdef CONFIG_IP_VS_IPV6
 195	if (af == AF_INET6)
 196		len = snprintf(&buf[*idx], buf_len - *idx, "[%pI6c]",
 197			       &addr->in6) + 1;
 198	else
 199#endif
 200		len = snprintf(&buf[*idx], buf_len - *idx, "%pI4",
 201			       &addr->ip) + 1;
 202
 203	*idx += len;
 204	BUG_ON(*idx > buf_len + 1);
 205	return &buf[*idx - len];
 206}
 207
 208#define IP_VS_DBG_BUF(level, msg, ...)					\
 209	do {								\
 210		char ip_vs_dbg_buf[160];				\
 211		int ip_vs_dbg_idx = 0;					\
 212		if (level <= ip_vs_get_debug_level())			\
 213			printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__);	\
 214	} while (0)
 215#define IP_VS_ERR_BUF(msg...)						\
 216	do {								\
 217		char ip_vs_dbg_buf[160];				\
 218		int ip_vs_dbg_idx = 0;					\
 219		pr_err(msg);						\
 220	} while (0)
 221
 222/* Only use from within IP_VS_DBG_BUF() or IP_VS_ERR_BUF macros */
 223#define IP_VS_DBG_ADDR(af, addr)					\
 224	ip_vs_dbg_addr(af, ip_vs_dbg_buf,				\
 225		       sizeof(ip_vs_dbg_buf), addr,			\
 226		       &ip_vs_dbg_idx)
 227
 228#define IP_VS_DBG(level, msg, ...)					\
 229	do {								\
 230		if (level <= ip_vs_get_debug_level())			\
 231			printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__);	\
 232	} while (0)
 233#define IP_VS_DBG_RL(msg, ...)						\
 234	do {								\
 235		if (net_ratelimit())					\
 236			printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__);	\
 237	} while (0)
 238#define IP_VS_DBG_PKT(level, af, pp, skb, ofs, msg)			\
 239	do {								\
 240		if (level <= ip_vs_get_debug_level())			\
 241			pp->debug_packet(af, pp, skb, ofs, msg);	\
 242	} while (0)
 243#define IP_VS_DBG_RL_PKT(level, af, pp, skb, ofs, msg)			\
 244	do {								\
 245		if (level <= ip_vs_get_debug_level() &&			\
 246		    net_ratelimit())					\
 247			pp->debug_packet(af, pp, skb, ofs, msg);	\
 248	} while (0)
 249#else	/* NO DEBUGGING at ALL */
 250#define IP_VS_DBG_BUF(level, msg...)  do {} while (0)
 251#define IP_VS_ERR_BUF(msg...)  do {} while (0)
 252#define IP_VS_DBG(level, msg...)  do {} while (0)
 253#define IP_VS_DBG_RL(msg...)  do {} while (0)
 254#define IP_VS_DBG_PKT(level, af, pp, skb, ofs, msg)	do {} while (0)
 255#define IP_VS_DBG_RL_PKT(level, af, pp, skb, ofs, msg)	do {} while (0)
 256#endif
 257
 258#define IP_VS_BUG() BUG()
 259#define IP_VS_ERR_RL(msg, ...)						\
 260	do {								\
 261		if (net_ratelimit())					\
 262			pr_err(msg, ##__VA_ARGS__);			\
 263	} while (0)
 264
 265#ifdef CONFIG_IP_VS_DEBUG
 266#define EnterFunction(level)						\
 267	do {								\
 268		if (level <= ip_vs_get_debug_level())			\
 269			printk(KERN_DEBUG				\
 270			       pr_fmt("Enter: %s, %s line %i\n"),	\
 271			       __func__, __FILE__, __LINE__);		\
 272	} while (0)
 273#define LeaveFunction(level)						\
 274	do {								\
 275		if (level <= ip_vs_get_debug_level())			\
 276			printk(KERN_DEBUG				\
 277			       pr_fmt("Leave: %s, %s line %i\n"),	\
 278			       __func__, __FILE__, __LINE__);		\
 279	} while (0)
 280#else
 281#define EnterFunction(level)   do {} while (0)
 282#define LeaveFunction(level)   do {} while (0)
 283#endif
 284
 285/* The port number of FTP service (in network order). */
 286#define FTPPORT  cpu_to_be16(21)
 287#define FTPDATA  cpu_to_be16(20)
 288
 289/* TCP State Values */
 290enum {
 291	IP_VS_TCP_S_NONE = 0,
 292	IP_VS_TCP_S_ESTABLISHED,
 293	IP_VS_TCP_S_SYN_SENT,
 294	IP_VS_TCP_S_SYN_RECV,
 295	IP_VS_TCP_S_FIN_WAIT,
 296	IP_VS_TCP_S_TIME_WAIT,
 297	IP_VS_TCP_S_CLOSE,
 298	IP_VS_TCP_S_CLOSE_WAIT,
 299	IP_VS_TCP_S_LAST_ACK,
 300	IP_VS_TCP_S_LISTEN,
 301	IP_VS_TCP_S_SYNACK,
 302	IP_VS_TCP_S_LAST
 303};
 304
 305/* UDP State Values */
 306enum {
 307	IP_VS_UDP_S_NORMAL,
 308	IP_VS_UDP_S_LAST,
 309};
 310
 311/* ICMP State Values */
 312enum {
 313	IP_VS_ICMP_S_NORMAL,
 314	IP_VS_ICMP_S_LAST,
 315};
 316
 317/* SCTP State Values */
 318enum ip_vs_sctp_states {
 319	IP_VS_SCTP_S_NONE,
 320	IP_VS_SCTP_S_INIT1,
 321	IP_VS_SCTP_S_INIT,
 322	IP_VS_SCTP_S_COOKIE_SENT,
 323	IP_VS_SCTP_S_COOKIE_REPLIED,
 324	IP_VS_SCTP_S_COOKIE_WAIT,
 325	IP_VS_SCTP_S_COOKIE,
 326	IP_VS_SCTP_S_COOKIE_ECHOED,
 327	IP_VS_SCTP_S_ESTABLISHED,
 328	IP_VS_SCTP_S_SHUTDOWN_SENT,
 329	IP_VS_SCTP_S_SHUTDOWN_RECEIVED,
 330	IP_VS_SCTP_S_SHUTDOWN_ACK_SENT,
 331	IP_VS_SCTP_S_REJECTED,
 332	IP_VS_SCTP_S_CLOSED,
 333	IP_VS_SCTP_S_LAST
 334};
 335
 336/* Connection templates use bits from state */
 337#define IP_VS_CTPL_S_NONE		0x0000
 338#define IP_VS_CTPL_S_ASSURED		0x0001
 339#define IP_VS_CTPL_S_LAST		0x0002
 340
 341/* Delta sequence info structure
 342 * Each ip_vs_conn has 2 (output AND input seq. changes).
 343 * Only used in the VS/NAT.
 344 */
 345struct ip_vs_seq {
 346	__u32			init_seq;	/* Add delta from this seq */
 347	__u32			delta;		/* Delta in sequence numbers */
 348	__u32			previous_delta;	/* Delta in sequence numbers
 349						 * before last resized pkt */
 350};
 351
 352/* counters per cpu */
 353struct ip_vs_counters {
 354	__u64		conns;		/* connections scheduled */
 355	__u64		inpkts;		/* incoming packets */
 356	__u64		outpkts;	/* outgoing packets */
 357	__u64		inbytes;	/* incoming bytes */
 358	__u64		outbytes;	/* outgoing bytes */
 359};
 360/* Stats per cpu */
 361struct ip_vs_cpu_stats {
 362	struct ip_vs_counters   cnt;
 363	struct u64_stats_sync   syncp;
 364};
 365
 366/* IPVS statistics objects */
 367struct ip_vs_estimator {
 368	struct list_head	list;
 369
 370	u64			last_inbytes;
 371	u64			last_outbytes;
 372	u64			last_conns;
 373	u64			last_inpkts;
 374	u64			last_outpkts;
 375
 376	u64			cps;
 377	u64			inpps;
 378	u64			outpps;
 379	u64			inbps;
 380	u64			outbps;
 381};
 382
 383/*
 384 * IPVS statistics object, 64-bit kernel version of struct ip_vs_stats_user
 385 */
 386struct ip_vs_kstats {
 387	u64			conns;		/* connections scheduled */
 388	u64			inpkts;		/* incoming packets */
 389	u64			outpkts;	/* outgoing packets */
 390	u64			inbytes;	/* incoming bytes */
 391	u64			outbytes;	/* outgoing bytes */
 392
 393	u64			cps;		/* current connection rate */
 394	u64			inpps;		/* current in packet rate */
 395	u64			outpps;		/* current out packet rate */
 396	u64			inbps;		/* current in byte rate */
 397	u64			outbps;		/* current out byte rate */
 398};
 399
 400struct ip_vs_stats {
 401	struct ip_vs_kstats	kstats;		/* kernel statistics */
 402	struct ip_vs_estimator	est;		/* estimator */
 403	struct ip_vs_cpu_stats __percpu	*cpustats;	/* per cpu counters */
 404	spinlock_t		lock;		/* spin lock */
 405	struct ip_vs_kstats	kstats0;	/* reset values */
 406};
 407
 408struct dst_entry;
 409struct iphdr;
 410struct ip_vs_conn;
 411struct ip_vs_app;
 412struct sk_buff;
 413struct ip_vs_proto_data;
 414
 415struct ip_vs_protocol {
 416	struct ip_vs_protocol	*next;
 417	char			*name;
 418	u16			protocol;
 419	u16			num_states;
 420	int			dont_defrag;
 421
 422	void (*init)(struct ip_vs_protocol *pp);
 423
 424	void (*exit)(struct ip_vs_protocol *pp);
 425
 426	int (*init_netns)(struct netns_ipvs *ipvs, struct ip_vs_proto_data *pd);
 427
 428	void (*exit_netns)(struct netns_ipvs *ipvs, struct ip_vs_proto_data *pd);
 429
 430	int (*conn_schedule)(struct netns_ipvs *ipvs,
 431			     int af, struct sk_buff *skb,
 432			     struct ip_vs_proto_data *pd,
 433			     int *verdict, struct ip_vs_conn **cpp,
 434			     struct ip_vs_iphdr *iph);
 435
 436	struct ip_vs_conn *
 437	(*conn_in_get)(struct netns_ipvs *ipvs,
 438		       int af,
 439		       const struct sk_buff *skb,
 440		       const struct ip_vs_iphdr *iph);
 441
 442	struct ip_vs_conn *
 443	(*conn_out_get)(struct netns_ipvs *ipvs,
 444			int af,
 445			const struct sk_buff *skb,
 446			const struct ip_vs_iphdr *iph);
 447
 448	int (*snat_handler)(struct sk_buff *skb, struct ip_vs_protocol *pp,
 449			    struct ip_vs_conn *cp, struct ip_vs_iphdr *iph);
 450
 451	int (*dnat_handler)(struct sk_buff *skb, struct ip_vs_protocol *pp,
 452			    struct ip_vs_conn *cp, struct ip_vs_iphdr *iph);
 453
 454	const char *(*state_name)(int state);
 455
 456	void (*state_transition)(struct ip_vs_conn *cp, int direction,
 457				 const struct sk_buff *skb,
 458				 struct ip_vs_proto_data *pd);
 459
 460	int (*register_app)(struct netns_ipvs *ipvs, struct ip_vs_app *inc);
 461
 462	void (*unregister_app)(struct netns_ipvs *ipvs, struct ip_vs_app *inc);
 463
 464	int (*app_conn_bind)(struct ip_vs_conn *cp);
 465
 466	void (*debug_packet)(int af, struct ip_vs_protocol *pp,
 467			     const struct sk_buff *skb,
 468			     int offset,
 469			     const char *msg);
 470
 471	void (*timeout_change)(struct ip_vs_proto_data *pd, int flags);
 472};
 473
 474/* protocol data per netns */
 475struct ip_vs_proto_data {
 476	struct ip_vs_proto_data	*next;
 477	struct ip_vs_protocol	*pp;
 478	int			*timeout_table;	/* protocol timeout table */
 479	atomic_t		appcnt;		/* counter of proto app incs. */
 480	struct tcp_states_t	*tcp_state_table;
 481};
 482
 483struct ip_vs_protocol   *ip_vs_proto_get(unsigned short proto);
 484struct ip_vs_proto_data *ip_vs_proto_data_get(struct netns_ipvs *ipvs,
 485					      unsigned short proto);
 486
 487struct ip_vs_conn_param {
 488	struct netns_ipvs		*ipvs;
 489	const union nf_inet_addr	*caddr;
 490	const union nf_inet_addr	*vaddr;
 491	__be16				cport;
 492	__be16				vport;
 493	__u16				protocol;
 494	u16				af;
 495
 496	const struct ip_vs_pe		*pe;
 497	char				*pe_data;
 498	__u8				pe_data_len;
 499};
 500
 501/* IP_VS structure allocated for each dynamically scheduled connection */
 502struct ip_vs_conn {
 503	struct hlist_node	c_list;         /* hashed list heads */
 504	/* Protocol, addresses and port numbers */
 505	__be16                  cport;
 506	__be16                  dport;
 507	__be16                  vport;
 508	u16			af;		/* address family */
 509	union nf_inet_addr      caddr;          /* client address */
 510	union nf_inet_addr      vaddr;          /* virtual address */
 511	union nf_inet_addr      daddr;          /* destination address */
 512	volatile __u32          flags;          /* status flags */
 513	__u16                   protocol;       /* Which protocol (TCP/UDP) */
 514	__u16			daf;		/* Address family of the dest */
 515	struct netns_ipvs	*ipvs;
 516
 517	/* counter and timer */
 518	refcount_t		refcnt;		/* reference count */
 519	struct timer_list	timer;		/* Expiration timer */
 520	volatile unsigned long	timeout;	/* timeout */
 521
 522	/* Flags and state transition */
 523	spinlock_t              lock;           /* lock for state transition */
 524	volatile __u16          state;          /* state info */
 525	volatile __u16          old_state;      /* old state, to be used for
 526						 * state transition triggerd
 527						 * synchronization
 528						 */
 529	__u32			fwmark;		/* Fire wall mark from skb */
 530	unsigned long		sync_endtime;	/* jiffies + sent_retries */
 531
 532	/* Control members */
 533	struct ip_vs_conn       *control;       /* Master control connection */
 534	atomic_t                n_control;      /* Number of controlled ones */
 535	struct ip_vs_dest       *dest;          /* real server */
 536	atomic_t                in_pkts;        /* incoming packet counter */
 537
 538	/* Packet transmitter for different forwarding methods.  If it
 539	 * mangles the packet, it must return NF_DROP or better NF_STOLEN,
 540	 * otherwise this must be changed to a sk_buff **.
 541	 * NF_ACCEPT can be returned when destination is local.
 542	 */
 543	int (*packet_xmit)(struct sk_buff *skb, struct ip_vs_conn *cp,
 544			   struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
 545
 546	/* Note: we can group the following members into a structure,
 547	 * in order to save more space, and the following members are
 548	 * only used in VS/NAT anyway
 549	 */
 550	struct ip_vs_app        *app;           /* bound ip_vs_app object */
 551	void                    *app_data;      /* Application private data */
 552	struct ip_vs_seq        in_seq;         /* incoming seq. struct */
 553	struct ip_vs_seq        out_seq;        /* outgoing seq. struct */
 554
 555	const struct ip_vs_pe	*pe;
 556	char			*pe_data;
 557	__u8			pe_data_len;
 558
 559	struct rcu_head		rcu_head;
 560};
 561
 562/* Extended internal versions of struct ip_vs_service_user and ip_vs_dest_user
 563 * for IPv6 support.
 564 *
 565 * We need these to conveniently pass around service and destination
 566 * options, but unfortunately, we also need to keep the old definitions to
 567 * maintain userspace backwards compatibility for the setsockopt interface.
 568 */
 569struct ip_vs_service_user_kern {
 570	/* virtual service addresses */
 571	u16			af;
 572	u16			protocol;
 573	union nf_inet_addr	addr;		/* virtual ip address */
 574	__be16			port;
 575	u32			fwmark;		/* firwall mark of service */
 576
 577	/* virtual service options */
 578	char			*sched_name;
 579	char			*pe_name;
 580	unsigned int		flags;		/* virtual service flags */
 581	unsigned int		timeout;	/* persistent timeout in sec */
 582	__be32			netmask;	/* persistent netmask or plen */
 583};
 584
 585
 586struct ip_vs_dest_user_kern {
 587	/* destination server address */
 588	union nf_inet_addr	addr;
 589	__be16			port;
 590
 591	/* real server options */
 592	unsigned int		conn_flags;	/* connection flags */
 593	int			weight;		/* destination weight */
 594
 595	/* thresholds for active connections */
 596	u32			u_threshold;	/* upper threshold */
 597	u32			l_threshold;	/* lower threshold */
 598
 599	/* Address family of addr */
 600	u16			af;
 601
 602	u16			tun_type;	/* tunnel type */
 603	__be16			tun_port;	/* tunnel port */
 604	u16			tun_flags;	/* tunnel flags */
 605};
 606
 607
 608/*
 609 * The information about the virtual service offered to the net and the
 610 * forwarding entries.
 611 */
 612struct ip_vs_service {
 613	struct hlist_node	s_list;   /* for normal service table */
 614	struct hlist_node	f_list;   /* for fwmark-based service table */
 615	atomic_t		refcnt;   /* reference counter */
 616
 617	u16			af;       /* address family */
 618	__u16			protocol; /* which protocol (TCP/UDP) */
 619	union nf_inet_addr	addr;	  /* IP address for virtual service */
 620	__be16			port;	  /* port number for the service */
 621	__u32                   fwmark;   /* firewall mark of the service */
 622	unsigned int		flags;	  /* service status flags */
 623	unsigned int		timeout;  /* persistent timeout in ticks */
 624	__be32			netmask;  /* grouping granularity, mask/plen */
 625	struct netns_ipvs	*ipvs;
 626
 627	struct list_head	destinations;  /* real server d-linked list */
 628	__u32			num_dests;     /* number of servers */
 629	struct ip_vs_stats      stats;         /* statistics for the service */
 630
 631	/* for scheduling */
 632	struct ip_vs_scheduler __rcu *scheduler; /* bound scheduler object */
 633	spinlock_t		sched_lock;    /* lock sched_data */
 634	void			*sched_data;   /* scheduler application data */
 635
 636	/* alternate persistence engine */
 637	struct ip_vs_pe __rcu	*pe;
 638	int			conntrack_afmask;
 639
 640	struct rcu_head		rcu_head;
 641};
 642
 643/* Information for cached dst */
 644struct ip_vs_dest_dst {
 645	struct dst_entry	*dst_cache;	/* destination cache entry */
 646	u32			dst_cookie;
 647	union nf_inet_addr	dst_saddr;
 648	struct rcu_head		rcu_head;
 649};
 650
 651/* The real server destination forwarding entry with ip address, port number,
 652 * and so on.
 653 */
 654struct ip_vs_dest {
 655	struct list_head	n_list;   /* for the dests in the service */
 656	struct hlist_node	d_list;   /* for table with all the dests */
 657
 658	u16			af;		/* address family */
 659	__be16			port;		/* port number of the server */
 660	union nf_inet_addr	addr;		/* IP address of the server */
 661	volatile unsigned int	flags;		/* dest status flags */
 662	atomic_t		conn_flags;	/* flags to copy to conn */
 663	atomic_t		weight;		/* server weight */
 664	atomic_t		last_weight;	/* server latest weight */
 665	__u16			tun_type;	/* tunnel type */
 666	__be16			tun_port;	/* tunnel port */
 667	__u16			tun_flags;	/* tunnel flags */
 668
 669	refcount_t		refcnt;		/* reference counter */
 670	struct ip_vs_stats      stats;          /* statistics */
 671	unsigned long		idle_start;	/* start time, jiffies */
 672
 673	/* connection counters and thresholds */
 674	atomic_t		activeconns;	/* active connections */
 675	atomic_t		inactconns;	/* inactive connections */
 676	atomic_t		persistconns;	/* persistent connections */
 677	__u32			u_threshold;	/* upper threshold */
 678	__u32			l_threshold;	/* lower threshold */
 679
 680	/* for destination cache */
 681	spinlock_t		dst_lock;	/* lock of dst_cache */
 682	struct ip_vs_dest_dst __rcu *dest_dst;	/* cached dst info */
 683
 684	/* for virtual service */
 685	struct ip_vs_service __rcu *svc;	/* service it belongs to */
 686	__u16			protocol;	/* which protocol (TCP/UDP) */
 687	__be16			vport;		/* virtual port number */
 688	union nf_inet_addr	vaddr;		/* virtual IP address */
 689	__u32			vfwmark;	/* firewall mark of service */
 690
 691	struct list_head	t_list;		/* in dest_trash */
 692	unsigned int		in_rs_table:1;	/* we are in rs_table */
 693};
 694
 695/* The scheduler object */
 696struct ip_vs_scheduler {
 697	struct list_head	n_list;		/* d-linked list head */
 698	char			*name;		/* scheduler name */
 699	atomic_t		refcnt;		/* reference counter */
 700	struct module		*module;	/* THIS_MODULE/NULL */
 701
 702	/* scheduler initializing service */
 703	int (*init_service)(struct ip_vs_service *svc);
 704	/* scheduling service finish */
 705	void (*done_service)(struct ip_vs_service *svc);
 706	/* dest is linked */
 707	int (*add_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest);
 708	/* dest is unlinked */
 709	int (*del_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest);
 710	/* dest is updated */
 711	int (*upd_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest);
 712
 713	/* selecting a server from the given service */
 714	struct ip_vs_dest* (*schedule)(struct ip_vs_service *svc,
 715				       const struct sk_buff *skb,
 716				       struct ip_vs_iphdr *iph);
 717};
 718
 719/* The persistence engine object */
 720struct ip_vs_pe {
 721	struct list_head	n_list;		/* d-linked list head */
 722	char			*name;		/* scheduler name */
 723	atomic_t		refcnt;		/* reference counter */
 724	struct module		*module;	/* THIS_MODULE/NULL */
 725
 726	/* get the connection template, if any */
 727	int (*fill_param)(struct ip_vs_conn_param *p, struct sk_buff *skb);
 728	bool (*ct_match)(const struct ip_vs_conn_param *p,
 729			 struct ip_vs_conn *ct);
 730	u32 (*hashkey_raw)(const struct ip_vs_conn_param *p, u32 initval,
 731			   bool inverse);
 732	int (*show_pe_data)(const struct ip_vs_conn *cp, char *buf);
 733	/* create connections for real-server outgoing packets */
 734	struct ip_vs_conn* (*conn_out)(struct ip_vs_service *svc,
 735				       struct ip_vs_dest *dest,
 736				       struct sk_buff *skb,
 737				       const struct ip_vs_iphdr *iph,
 738				       __be16 dport, __be16 cport);
 739};
 740
 741/* The application module object (a.k.a. app incarnation) */
 742struct ip_vs_app {
 743	struct list_head	a_list;		/* member in app list */
 744	int			type;		/* IP_VS_APP_TYPE_xxx */
 745	char			*name;		/* application module name */
 746	__u16			protocol;
 747	struct module		*module;	/* THIS_MODULE/NULL */
 748	struct list_head	incs_list;	/* list of incarnations */
 749
 750	/* members for application incarnations */
 751	struct list_head	p_list;		/* member in proto app list */
 752	struct ip_vs_app	*app;		/* its real application */
 753	__be16			port;		/* port number in net order */
 754	atomic_t		usecnt;		/* usage counter */
 755	struct rcu_head		rcu_head;
 756
 757	/* output hook: Process packet in inout direction, diff set for TCP.
 758	 * Return: 0=Error, 1=Payload Not Mangled/Mangled but checksum is ok,
 759	 *	   2=Mangled but checksum was not updated
 760	 */
 761	int (*pkt_out)(struct ip_vs_app *, struct ip_vs_conn *,
 762		       struct sk_buff *, int *diff, struct ip_vs_iphdr *ipvsh);
 763
 764	/* input hook: Process packet in outin direction, diff set for TCP.
 765	 * Return: 0=Error, 1=Payload Not Mangled/Mangled but checksum is ok,
 766	 *	   2=Mangled but checksum was not updated
 767	 */
 768	int (*pkt_in)(struct ip_vs_app *, struct ip_vs_conn *,
 769		      struct sk_buff *, int *diff, struct ip_vs_iphdr *ipvsh);
 770
 771	/* ip_vs_app initializer */
 772	int (*init_conn)(struct ip_vs_app *, struct ip_vs_conn *);
 773
 774	/* ip_vs_app finish */
 775	int (*done_conn)(struct ip_vs_app *, struct ip_vs_conn *);
 776
 777
 778	/* not used now */
 779	int (*bind_conn)(struct ip_vs_app *, struct ip_vs_conn *,
 780			 struct ip_vs_protocol *);
 781
 782	void (*unbind_conn)(struct ip_vs_app *, struct ip_vs_conn *);
 783
 784	int *			timeout_table;
 785	int *			timeouts;
 786	int			timeouts_size;
 787
 788	int (*conn_schedule)(struct sk_buff *skb, struct ip_vs_app *app,
 789			     int *verdict, struct ip_vs_conn **cpp);
 790
 791	struct ip_vs_conn *
 792	(*conn_in_get)(const struct sk_buff *skb, struct ip_vs_app *app,
 793		       const struct iphdr *iph, int inverse);
 794
 795	struct ip_vs_conn *
 796	(*conn_out_get)(const struct sk_buff *skb, struct ip_vs_app *app,
 797			const struct iphdr *iph, int inverse);
 798
 799	int (*state_transition)(struct ip_vs_conn *cp, int direction,
 800				const struct sk_buff *skb,
 801				struct ip_vs_app *app);
 802
 803	void (*timeout_change)(struct ip_vs_app *app, int flags);
 804};
 805
 806struct ipvs_master_sync_state {
 807	struct list_head	sync_queue;
 808	struct ip_vs_sync_buff	*sync_buff;
 809	unsigned long		sync_queue_len;
 810	unsigned int		sync_queue_delay;
 811	struct delayed_work	master_wakeup_work;
 812	struct netns_ipvs	*ipvs;
 813};
 814
 815struct ip_vs_sync_thread_data;
 816
 817/* How much time to keep dests in trash */
 818#define IP_VS_DEST_TRASH_PERIOD		(120 * HZ)
 819
 820struct ipvs_sync_daemon_cfg {
 821	union nf_inet_addr	mcast_group;
 822	int			syncid;
 823	u16			sync_maxlen;
 824	u16			mcast_port;
 825	u8			mcast_af;
 826	u8			mcast_ttl;
 827	/* multicast interface name */
 828	char			mcast_ifn[IP_VS_IFNAME_MAXLEN];
 829};
 830
 831/* IPVS in network namespace */
 832struct netns_ipvs {
 833	int			gen;		/* Generation */
 834	int			enable;		/* enable like nf_hooks do */
 835	/* Hash table: for real service lookups */
 836	#define IP_VS_RTAB_BITS 4
 837	#define IP_VS_RTAB_SIZE (1 << IP_VS_RTAB_BITS)
 838	#define IP_VS_RTAB_MASK (IP_VS_RTAB_SIZE - 1)
 839
 840	struct hlist_head	rs_table[IP_VS_RTAB_SIZE];
 841	/* ip_vs_app */
 842	struct list_head	app_list;
 843	/* ip_vs_proto */
 844	#define IP_VS_PROTO_TAB_SIZE	32	/* must be power of 2 */
 845	struct ip_vs_proto_data *proto_data_table[IP_VS_PROTO_TAB_SIZE];
 846	/* ip_vs_proto_tcp */
 847#ifdef CONFIG_IP_VS_PROTO_TCP
 848	#define	TCP_APP_TAB_BITS	4
 849	#define	TCP_APP_TAB_SIZE	(1 << TCP_APP_TAB_BITS)
 850	#define	TCP_APP_TAB_MASK	(TCP_APP_TAB_SIZE - 1)
 851	struct list_head	tcp_apps[TCP_APP_TAB_SIZE];
 852#endif
 853	/* ip_vs_proto_udp */
 854#ifdef CONFIG_IP_VS_PROTO_UDP
 855	#define	UDP_APP_TAB_BITS	4
 856	#define	UDP_APP_TAB_SIZE	(1 << UDP_APP_TAB_BITS)
 857	#define	UDP_APP_TAB_MASK	(UDP_APP_TAB_SIZE - 1)
 858	struct list_head	udp_apps[UDP_APP_TAB_SIZE];
 859#endif
 860	/* ip_vs_proto_sctp */
 861#ifdef CONFIG_IP_VS_PROTO_SCTP
 862	#define SCTP_APP_TAB_BITS	4
 863	#define SCTP_APP_TAB_SIZE	(1 << SCTP_APP_TAB_BITS)
 864	#define SCTP_APP_TAB_MASK	(SCTP_APP_TAB_SIZE - 1)
 865	/* Hash table for SCTP application incarnations	 */
 866	struct list_head	sctp_apps[SCTP_APP_TAB_SIZE];
 867#endif
 868	/* ip_vs_conn */
 869	atomic_t		conn_count;      /* connection counter */
 870
 871	/* ip_vs_ctl */
 872	struct ip_vs_stats		tot_stats;  /* Statistics & est. */
 873
 874	int			num_services;    /* no of virtual services */
 875	int			num_services6;   /* IPv6 virtual services */
 876
 877	/* Trash for destinations */
 878	struct list_head	dest_trash;
 879	spinlock_t		dest_trash_lock;
 880	struct timer_list	dest_trash_timer; /* expiration timer */
 881	/* Service counters */
 882	atomic_t		ftpsvc_counter;
 883	atomic_t		nullsvc_counter;
 884	atomic_t		conn_out_counter;
 885
 886#ifdef CONFIG_SYSCTL
 887	/* delayed work for expiring no dest connections */
 888	struct delayed_work	expire_nodest_conn_work;
 889	/* 1/rate drop and drop-entry variables */
 890	struct delayed_work	defense_work;   /* Work handler */
 891	int			drop_rate;
 892	int			drop_counter;
 893	int			old_secure_tcp;
 894	atomic_t		dropentry;
 895	/* locks in ctl.c */
 896	spinlock_t		dropentry_lock;  /* drop entry handling */
 897	spinlock_t		droppacket_lock; /* drop packet handling */
 898	spinlock_t		securetcp_lock;  /* state and timeout tables */
 899
 900	/* sys-ctl struct */
 901	struct ctl_table_header	*sysctl_hdr;
 902	struct ctl_table	*sysctl_tbl;
 903#endif
 904
 905	/* sysctl variables */
 906	int			sysctl_amemthresh;
 907	int			sysctl_am_droprate;
 908	int			sysctl_drop_entry;
 909	int			sysctl_drop_packet;
 910	int			sysctl_secure_tcp;
 911#ifdef CONFIG_IP_VS_NFCT
 912	int			sysctl_conntrack;
 913#endif
 914	int			sysctl_snat_reroute;
 915	int			sysctl_sync_ver;
 916	int			sysctl_sync_ports;
 917	int			sysctl_sync_persist_mode;
 918	unsigned long		sysctl_sync_qlen_max;
 919	int			sysctl_sync_sock_size;
 920	int			sysctl_cache_bypass;
 921	int			sysctl_expire_nodest_conn;
 922	int			sysctl_sloppy_tcp;
 923	int			sysctl_sloppy_sctp;
 924	int			sysctl_expire_quiescent_template;
 925	int			sysctl_sync_threshold[2];
 926	unsigned int		sysctl_sync_refresh_period;
 927	int			sysctl_sync_retries;
 928	int			sysctl_nat_icmp_send;
 929	int			sysctl_pmtu_disc;
 930	int			sysctl_backup_only;
 931	int			sysctl_conn_reuse_mode;
 932	int			sysctl_schedule_icmp;
 933	int			sysctl_ignore_tunneled;
 934
 935	/* ip_vs_lblc */
 936	int			sysctl_lblc_expiration;
 937	struct ctl_table_header	*lblc_ctl_header;
 938	struct ctl_table	*lblc_ctl_table;
 939	/* ip_vs_lblcr */
 940	int			sysctl_lblcr_expiration;
 941	struct ctl_table_header	*lblcr_ctl_header;
 942	struct ctl_table	*lblcr_ctl_table;
 943	/* ip_vs_est */
 944	struct list_head	est_list;	/* estimator list */
 945	spinlock_t		est_lock;
 946	struct timer_list	est_timer;	/* Estimation timer */
 947	/* ip_vs_sync */
 948	spinlock_t		sync_lock;
 949	struct ipvs_master_sync_state *ms;
 950	spinlock_t		sync_buff_lock;
 951	struct ip_vs_sync_thread_data *master_tinfo;
 952	struct ip_vs_sync_thread_data *backup_tinfo;
 953	int			threads_mask;
 954	volatile int		sync_state;
 955	struct mutex		sync_mutex;
 956	struct ipvs_sync_daemon_cfg	mcfg;	/* Master Configuration */
 957	struct ipvs_sync_daemon_cfg	bcfg;	/* Backup Configuration */
 958	/* net name space ptr */
 959	struct net		*net;            /* Needed by timer routines */
 960	/* Number of heterogeneous destinations, needed becaus heterogeneous
 961	 * are not supported when synchronization is enabled.
 962	 */
 963	unsigned int		mixed_address_family_dests;
 964	unsigned int		hooks_afmask;	/* &1=AF_INET, &2=AF_INET6 */
 965};
 966
 967#define DEFAULT_SYNC_THRESHOLD	3
 968#define DEFAULT_SYNC_PERIOD	50
 969#define DEFAULT_SYNC_VER	1
 970#define DEFAULT_SLOPPY_TCP	0
 971#define DEFAULT_SLOPPY_SCTP	0
 972#define DEFAULT_SYNC_REFRESH_PERIOD	(0U * HZ)
 973#define DEFAULT_SYNC_RETRIES		0
 974#define IPVS_SYNC_WAKEUP_RATE	8
 975#define IPVS_SYNC_QLEN_MAX	(IPVS_SYNC_WAKEUP_RATE * 4)
 976#define IPVS_SYNC_SEND_DELAY	(HZ / 50)
 977#define IPVS_SYNC_CHECK_PERIOD	HZ
 978#define IPVS_SYNC_FLUSH_TIME	(HZ * 2)
 979#define IPVS_SYNC_PORTS_MAX	(1 << 6)
 980
 981#ifdef CONFIG_SYSCTL
 982
 983static inline int sysctl_sync_threshold(struct netns_ipvs *ipvs)
 984{
 985	return ipvs->sysctl_sync_threshold[0];
 986}
 987
 988static inline int sysctl_sync_period(struct netns_ipvs *ipvs)
 989{
 990	return READ_ONCE(ipvs->sysctl_sync_threshold[1]);
 991}
 992
 993static inline unsigned int sysctl_sync_refresh_period(struct netns_ipvs *ipvs)
 994{
 995	return READ_ONCE(ipvs->sysctl_sync_refresh_period);
 996}
 997
 998static inline int sysctl_sync_retries(struct netns_ipvs *ipvs)
 999{
1000	return ipvs->sysctl_sync_retries;
1001}
1002
1003static inline int sysctl_sync_ver(struct netns_ipvs *ipvs)
1004{
1005	return ipvs->sysctl_sync_ver;
1006}
1007
1008static inline int sysctl_sloppy_tcp(struct netns_ipvs *ipvs)
1009{
1010	return ipvs->sysctl_sloppy_tcp;
1011}
1012
1013static inline int sysctl_sloppy_sctp(struct netns_ipvs *ipvs)
1014{
1015	return ipvs->sysctl_sloppy_sctp;
1016}
1017
1018static inline int sysctl_sync_ports(struct netns_ipvs *ipvs)
1019{
1020	return READ_ONCE(ipvs->sysctl_sync_ports);
1021}
1022
1023static inline int sysctl_sync_persist_mode(struct netns_ipvs *ipvs)
1024{
1025	return ipvs->sysctl_sync_persist_mode;
1026}
1027
1028static inline unsigned long sysctl_sync_qlen_max(struct netns_ipvs *ipvs)
1029{
1030	return ipvs->sysctl_sync_qlen_max;
1031}
1032
1033static inline int sysctl_sync_sock_size(struct netns_ipvs *ipvs)
1034{
1035	return ipvs->sysctl_sync_sock_size;
1036}
1037
1038static inline int sysctl_pmtu_disc(struct netns_ipvs *ipvs)
1039{
1040	return ipvs->sysctl_pmtu_disc;
1041}
1042
1043static inline int sysctl_backup_only(struct netns_ipvs *ipvs)
1044{
1045	return ipvs->sync_state & IP_VS_STATE_BACKUP &&
1046	       ipvs->sysctl_backup_only;
1047}
1048
1049static inline int sysctl_conn_reuse_mode(struct netns_ipvs *ipvs)
1050{
1051	return ipvs->sysctl_conn_reuse_mode;
1052}
1053
1054static inline int sysctl_expire_nodest_conn(struct netns_ipvs *ipvs)
1055{
1056	return ipvs->sysctl_expire_nodest_conn;
1057}
1058
1059static inline int sysctl_schedule_icmp(struct netns_ipvs *ipvs)
1060{
1061	return ipvs->sysctl_schedule_icmp;
1062}
1063
1064static inline int sysctl_ignore_tunneled(struct netns_ipvs *ipvs)
1065{
1066	return ipvs->sysctl_ignore_tunneled;
1067}
1068
1069static inline int sysctl_cache_bypass(struct netns_ipvs *ipvs)
1070{
1071	return ipvs->sysctl_cache_bypass;
1072}
1073
1074#else
1075
1076static inline int sysctl_sync_threshold(struct netns_ipvs *ipvs)
1077{
1078	return DEFAULT_SYNC_THRESHOLD;
1079}
1080
1081static inline int sysctl_sync_period(struct netns_ipvs *ipvs)
1082{
1083	return DEFAULT_SYNC_PERIOD;
1084}
1085
1086static inline unsigned int sysctl_sync_refresh_period(struct netns_ipvs *ipvs)
1087{
1088	return DEFAULT_SYNC_REFRESH_PERIOD;
1089}
1090
1091static inline int sysctl_sync_retries(struct netns_ipvs *ipvs)
1092{
1093	return DEFAULT_SYNC_RETRIES & 3;
1094}
1095
1096static inline int sysctl_sync_ver(struct netns_ipvs *ipvs)
1097{
1098	return DEFAULT_SYNC_VER;
1099}
1100
1101static inline int sysctl_sloppy_tcp(struct netns_ipvs *ipvs)
1102{
1103	return DEFAULT_SLOPPY_TCP;
1104}
1105
1106static inline int sysctl_sloppy_sctp(struct netns_ipvs *ipvs)
1107{
1108	return DEFAULT_SLOPPY_SCTP;
1109}
1110
1111static inline int sysctl_sync_ports(struct netns_ipvs *ipvs)
1112{
1113	return 1;
1114}
1115
1116static inline int sysctl_sync_persist_mode(struct netns_ipvs *ipvs)
1117{
1118	return 0;
1119}
1120
1121static inline unsigned long sysctl_sync_qlen_max(struct netns_ipvs *ipvs)
1122{
1123	return IPVS_SYNC_QLEN_MAX;
1124}
1125
1126static inline int sysctl_sync_sock_size(struct netns_ipvs *ipvs)
1127{
1128	return 0;
1129}
1130
1131static inline int sysctl_pmtu_disc(struct netns_ipvs *ipvs)
1132{
1133	return 1;
1134}
1135
1136static inline int sysctl_backup_only(struct netns_ipvs *ipvs)
1137{
1138	return 0;
1139}
1140
1141static inline int sysctl_conn_reuse_mode(struct netns_ipvs *ipvs)
1142{
1143	return 1;
1144}
1145
1146static inline int sysctl_expire_nodest_conn(struct netns_ipvs *ipvs)
1147{
1148	return 0;
1149}
1150
1151static inline int sysctl_schedule_icmp(struct netns_ipvs *ipvs)
1152{
1153	return 0;
1154}
1155
1156static inline int sysctl_ignore_tunneled(struct netns_ipvs *ipvs)
1157{
1158	return 0;
1159}
1160
1161static inline int sysctl_cache_bypass(struct netns_ipvs *ipvs)
1162{
1163	return 0;
1164}
1165
1166#endif
1167
1168/* IPVS core functions
1169 * (from ip_vs_core.c)
1170 */
1171const char *ip_vs_proto_name(unsigned int proto);
1172void ip_vs_init_hash_table(struct list_head *table, int rows);
1173struct ip_vs_conn *ip_vs_new_conn_out(struct ip_vs_service *svc,
1174				      struct ip_vs_dest *dest,
1175				      struct sk_buff *skb,
1176				      const struct ip_vs_iphdr *iph,
1177				      __be16 dport,
1178				      __be16 cport);
1179#define IP_VS_INIT_HASH_TABLE(t) ip_vs_init_hash_table((t), ARRAY_SIZE((t)))
1180
1181#define IP_VS_APP_TYPE_FTP	1
1182
1183/* ip_vs_conn handling functions
1184 * (from ip_vs_conn.c)
1185 */
1186enum {
1187	IP_VS_DIR_INPUT = 0,
1188	IP_VS_DIR_OUTPUT,
1189	IP_VS_DIR_INPUT_ONLY,
1190	IP_VS_DIR_LAST,
1191};
1192
1193static inline void ip_vs_conn_fill_param(struct netns_ipvs *ipvs, int af, int protocol,
1194					 const union nf_inet_addr *caddr,
1195					 __be16 cport,
1196					 const union nf_inet_addr *vaddr,
1197					 __be16 vport,
1198					 struct ip_vs_conn_param *p)
1199{
1200	p->ipvs = ipvs;
1201	p->af = af;
1202	p->protocol = protocol;
1203	p->caddr = caddr;
1204	p->cport = cport;
1205	p->vaddr = vaddr;
1206	p->vport = vport;
1207	p->pe = NULL;
1208	p->pe_data = NULL;
1209}
1210
1211struct ip_vs_conn *ip_vs_conn_in_get(const struct ip_vs_conn_param *p);
1212struct ip_vs_conn *ip_vs_ct_in_get(const struct ip_vs_conn_param *p);
1213
1214struct ip_vs_conn * ip_vs_conn_in_get_proto(struct netns_ipvs *ipvs, int af,
1215					    const struct sk_buff *skb,
1216					    const struct ip_vs_iphdr *iph);
1217
1218struct ip_vs_conn *ip_vs_conn_out_get(const struct ip_vs_conn_param *p);
1219
1220struct ip_vs_conn * ip_vs_conn_out_get_proto(struct netns_ipvs *ipvs, int af,
1221					     const struct sk_buff *skb,
1222					     const struct ip_vs_iphdr *iph);
1223
1224/* Get reference to gain full access to conn.
1225 * By default, RCU read-side critical sections have access only to
1226 * conn fields and its PE data, see ip_vs_conn_rcu_free() for reference.
1227 */
1228static inline bool __ip_vs_conn_get(struct ip_vs_conn *cp)
1229{
1230	return refcount_inc_not_zero(&cp->refcnt);
1231}
1232
1233/* put back the conn without restarting its timer */
1234static inline void __ip_vs_conn_put(struct ip_vs_conn *cp)
1235{
1236	smp_mb__before_atomic();
1237	refcount_dec(&cp->refcnt);
1238}
1239void ip_vs_conn_put(struct ip_vs_conn *cp);
1240void ip_vs_conn_fill_cport(struct ip_vs_conn *cp, __be16 cport);
1241
1242struct ip_vs_conn *ip_vs_conn_new(const struct ip_vs_conn_param *p, int dest_af,
1243				  const union nf_inet_addr *daddr,
1244				  __be16 dport, unsigned int flags,
1245				  struct ip_vs_dest *dest, __u32 fwmark);
1246void ip_vs_conn_expire_now(struct ip_vs_conn *cp);
1247
1248const char *ip_vs_state_name(const struct ip_vs_conn *cp);
1249
1250void ip_vs_tcp_conn_listen(struct ip_vs_conn *cp);
1251int ip_vs_check_template(struct ip_vs_conn *ct, struct ip_vs_dest *cdest);
1252void ip_vs_random_dropentry(struct netns_ipvs *ipvs);
1253int ip_vs_conn_init(void);
1254void ip_vs_conn_cleanup(void);
1255
1256static inline void ip_vs_control_del(struct ip_vs_conn *cp)
1257{
1258	struct ip_vs_conn *ctl_cp = cp->control;
1259	if (!ctl_cp) {
1260		IP_VS_ERR_BUF("request control DEL for uncontrolled: "
1261			      "%s:%d to %s:%d\n",
1262			      IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1263			      ntohs(cp->cport),
1264			      IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1265			      ntohs(cp->vport));
1266
1267		return;
1268	}
1269
1270	IP_VS_DBG_BUF(7, "DELeting control for: "
1271		      "cp.dst=%s:%d ctl_cp.dst=%s:%d\n",
1272		      IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1273		      ntohs(cp->cport),
1274		      IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr),
1275		      ntohs(ctl_cp->cport));
1276
1277	cp->control = NULL;
1278	if (atomic_read(&ctl_cp->n_control) == 0) {
1279		IP_VS_ERR_BUF("BUG control DEL with n=0 : "
1280			      "%s:%d to %s:%d\n",
1281			      IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1282			      ntohs(cp->cport),
1283			      IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1284			      ntohs(cp->vport));
1285
1286		return;
1287	}
1288	atomic_dec(&ctl_cp->n_control);
1289}
1290
1291static inline void
1292ip_vs_control_add(struct ip_vs_conn *cp, struct ip_vs_conn *ctl_cp)
1293{
1294	if (cp->control) {
1295		IP_VS_ERR_BUF("request control ADD for already controlled: "
1296			      "%s:%d to %s:%d\n",
1297			      IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1298			      ntohs(cp->cport),
1299			      IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1300			      ntohs(cp->vport));
1301
1302		ip_vs_control_del(cp);
1303	}
1304
1305	IP_VS_DBG_BUF(7, "ADDing control for: "
1306		      "cp.dst=%s:%d ctl_cp.dst=%s:%d\n",
1307		      IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1308		      ntohs(cp->cport),
1309		      IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr),
1310		      ntohs(ctl_cp->cport));
1311
1312	cp->control = ctl_cp;
1313	atomic_inc(&ctl_cp->n_control);
1314}
1315
1316/* Mark our template as assured */
1317static inline void
1318ip_vs_control_assure_ct(struct ip_vs_conn *cp)
1319{
1320	struct ip_vs_conn *ct = cp->control;
1321
1322	if (ct && !(ct->state & IP_VS_CTPL_S_ASSURED) &&
1323	    (ct->flags & IP_VS_CONN_F_TEMPLATE))
1324		ct->state |= IP_VS_CTPL_S_ASSURED;
1325}
1326
1327/* IPVS netns init & cleanup functions */
1328int ip_vs_estimator_net_init(struct netns_ipvs *ipvs);
1329int ip_vs_control_net_init(struct netns_ipvs *ipvs);
1330int ip_vs_protocol_net_init(struct netns_ipvs *ipvs);
1331int ip_vs_app_net_init(struct netns_ipvs *ipvs);
1332int ip_vs_conn_net_init(struct netns_ipvs *ipvs);
1333int ip_vs_sync_net_init(struct netns_ipvs *ipvs);
1334void ip_vs_conn_net_cleanup(struct netns_ipvs *ipvs);
1335void ip_vs_app_net_cleanup(struct netns_ipvs *ipvs);
1336void ip_vs_protocol_net_cleanup(struct netns_ipvs *ipvs);
1337void ip_vs_control_net_cleanup(struct netns_ipvs *ipvs);
1338void ip_vs_estimator_net_cleanup(struct netns_ipvs *ipvs);
1339void ip_vs_sync_net_cleanup(struct netns_ipvs *ipvs);
1340void ip_vs_service_nets_cleanup(struct list_head *net_list);
1341
1342/* IPVS application functions
1343 * (from ip_vs_app.c)
1344 */
1345#define IP_VS_APP_MAX_PORTS  8
1346struct ip_vs_app *register_ip_vs_app(struct netns_ipvs *ipvs, struct ip_vs_app *app);
1347void unregister_ip_vs_app(struct netns_ipvs *ipvs, struct ip_vs_app *app);
1348int ip_vs_bind_app(struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1349void ip_vs_unbind_app(struct ip_vs_conn *cp);
1350int register_ip_vs_app_inc(struct netns_ipvs *ipvs, struct ip_vs_app *app, __u16 proto,
1351			   __u16 port);
1352int ip_vs_app_inc_get(struct ip_vs_app *inc);
1353void ip_vs_app_inc_put(struct ip_vs_app *inc);
1354
1355int ip_vs_app_pkt_out(struct ip_vs_conn *, struct sk_buff *skb,
1356		      struct ip_vs_iphdr *ipvsh);
1357int ip_vs_app_pkt_in(struct ip_vs_conn *, struct sk_buff *skb,
1358		     struct ip_vs_iphdr *ipvsh);
1359
1360int register_ip_vs_pe(struct ip_vs_pe *pe);
1361int unregister_ip_vs_pe(struct ip_vs_pe *pe);
1362struct ip_vs_pe *ip_vs_pe_getbyname(const char *name);
1363struct ip_vs_pe *__ip_vs_pe_getbyname(const char *pe_name);
1364
1365/* Use a #define to avoid all of module.h just for these trivial ops */
1366#define ip_vs_pe_get(pe)			\
1367	if (pe && pe->module)			\
1368		__module_get(pe->module);
1369
1370#define ip_vs_pe_put(pe)			\
1371	if (pe && pe->module)			\
1372		module_put(pe->module);
1373
1374/* IPVS protocol functions (from ip_vs_proto.c) */
1375int ip_vs_protocol_init(void);
1376void ip_vs_protocol_cleanup(void);
1377void ip_vs_protocol_timeout_change(struct netns_ipvs *ipvs, int flags);
1378int *ip_vs_create_timeout_table(int *table, int size);
1379void ip_vs_tcpudp_debug_packet(int af, struct ip_vs_protocol *pp,
1380			       const struct sk_buff *skb, int offset,
1381			       const char *msg);
1382
1383extern struct ip_vs_protocol ip_vs_protocol_tcp;
1384extern struct ip_vs_protocol ip_vs_protocol_udp;
1385extern struct ip_vs_protocol ip_vs_protocol_icmp;
1386extern struct ip_vs_protocol ip_vs_protocol_esp;
1387extern struct ip_vs_protocol ip_vs_protocol_ah;
1388extern struct ip_vs_protocol ip_vs_protocol_sctp;
1389
1390/* Registering/unregistering scheduler functions
1391 * (from ip_vs_sched.c)
1392 */
1393int register_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
1394int unregister_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
1395int ip_vs_bind_scheduler(struct ip_vs_service *svc,
1396			 struct ip_vs_scheduler *scheduler);
1397void ip_vs_unbind_scheduler(struct ip_vs_service *svc,
1398			    struct ip_vs_scheduler *sched);
1399struct ip_vs_scheduler *ip_vs_scheduler_get(const char *sched_name);
1400void ip_vs_scheduler_put(struct ip_vs_scheduler *scheduler);
1401struct ip_vs_conn *
1402ip_vs_schedule(struct ip_vs_service *svc, struct sk_buff *skb,
1403	       struct ip_vs_proto_data *pd, int *ignored,
1404	       struct ip_vs_iphdr *iph);
1405int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb,
1406		struct ip_vs_proto_data *pd, struct ip_vs_iphdr *iph);
1407
1408void ip_vs_scheduler_err(struct ip_vs_service *svc, const char *msg);
1409
1410/* IPVS control data and functions (from ip_vs_ctl.c) */
1411extern struct ip_vs_stats ip_vs_stats;
1412extern int sysctl_ip_vs_sync_ver;
1413
1414struct ip_vs_service *
1415ip_vs_service_find(struct netns_ipvs *ipvs, int af, __u32 fwmark, __u16 protocol,
1416		  const union nf_inet_addr *vaddr, __be16 vport);
1417
1418bool ip_vs_has_real_service(struct netns_ipvs *ipvs, int af, __u16 protocol,
1419			    const union nf_inet_addr *daddr, __be16 dport);
1420
1421struct ip_vs_dest *
1422ip_vs_find_real_service(struct netns_ipvs *ipvs, int af, __u16 protocol,
1423			const union nf_inet_addr *daddr, __be16 dport);
1424struct ip_vs_dest *ip_vs_find_tunnel(struct netns_ipvs *ipvs, int af,
1425				     const union nf_inet_addr *daddr,
1426				     __be16 tun_port);
1427
1428int ip_vs_use_count_inc(void);
1429void ip_vs_use_count_dec(void);
1430int ip_vs_register_nl_ioctl(void);
1431void ip_vs_unregister_nl_ioctl(void);
1432int ip_vs_control_init(void);
1433void ip_vs_control_cleanup(void);
1434struct ip_vs_dest *
1435ip_vs_find_dest(struct netns_ipvs *ipvs, int svc_af, int dest_af,
1436		const union nf_inet_addr *daddr, __be16 dport,
1437		const union nf_inet_addr *vaddr, __be16 vport,
1438		__u16 protocol, __u32 fwmark, __u32 flags);
1439void ip_vs_try_bind_dest(struct ip_vs_conn *cp);
1440
1441static inline void ip_vs_dest_hold(struct ip_vs_dest *dest)
1442{
1443	refcount_inc(&dest->refcnt);
1444}
1445
1446static inline void ip_vs_dest_put(struct ip_vs_dest *dest)
1447{
1448	smp_mb__before_atomic();
1449	refcount_dec(&dest->refcnt);
1450}
1451
1452static inline void ip_vs_dest_put_and_free(struct ip_vs_dest *dest)
1453{
1454	if (refcount_dec_and_test(&dest->refcnt))
1455		kfree(dest);
1456}
1457
1458/* IPVS sync daemon data and function prototypes
1459 * (from ip_vs_sync.c)
1460 */
1461int start_sync_thread(struct netns_ipvs *ipvs, struct ipvs_sync_daemon_cfg *cfg,
1462		      int state);
1463int stop_sync_thread(struct netns_ipvs *ipvs, int state);
1464void ip_vs_sync_conn(struct netns_ipvs *ipvs, struct ip_vs_conn *cp, int pkts);
1465
1466/* IPVS rate estimator prototypes (from ip_vs_est.c) */
1467void ip_vs_start_estimator(struct netns_ipvs *ipvs, struct ip_vs_stats *stats);
1468void ip_vs_stop_estimator(struct netns_ipvs *ipvs, struct ip_vs_stats *stats);
1469void ip_vs_zero_estimator(struct ip_vs_stats *stats);
1470void ip_vs_read_estimator(struct ip_vs_kstats *dst, struct ip_vs_stats *stats);
1471
1472/* Various IPVS packet transmitters (from ip_vs_xmit.c) */
1473int ip_vs_null_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1474		    struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1475int ip_vs_bypass_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1476		      struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1477int ip_vs_nat_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1478		   struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1479int ip_vs_tunnel_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1480		      struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1481int ip_vs_dr_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1482		  struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1483int ip_vs_icmp_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1484		    struct ip_vs_protocol *pp, int offset,
1485		    unsigned int hooknum, struct ip_vs_iphdr *iph);
1486void ip_vs_dest_dst_rcu_free(struct rcu_head *head);
1487
1488#ifdef CONFIG_IP_VS_IPV6
1489int ip_vs_bypass_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1490			 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1491int ip_vs_nat_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1492		      struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1493int ip_vs_tunnel_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1494			 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1495int ip_vs_dr_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1496		     struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1497int ip_vs_icmp_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1498		       struct ip_vs_protocol *pp, int offset,
1499		       unsigned int hooknum, struct ip_vs_iphdr *iph);
1500#endif
1501
1502#ifdef CONFIG_SYSCTL
1503/* This is a simple mechanism to ignore packets when
1504 * we are loaded. Just set ip_vs_drop_rate to 'n' and
1505 * we start to drop 1/rate of the packets
1506 */
1507static inline int ip_vs_todrop(struct netns_ipvs *ipvs)
1508{
1509	if (!ipvs->drop_rate)
1510		return 0;
1511	if (--ipvs->drop_counter > 0)
1512		return 0;
1513	ipvs->drop_counter = ipvs->drop_rate;
1514	return 1;
1515}
1516#else
1517static inline int ip_vs_todrop(struct netns_ipvs *ipvs) { return 0; }
1518#endif
1519
1520#ifdef CONFIG_SYSCTL
1521/* Enqueue delayed work for expiring no dest connections
1522 * Only run when sysctl_expire_nodest=1
1523 */
1524static inline void ip_vs_enqueue_expire_nodest_conns(struct netns_ipvs *ipvs)
1525{
1526	if (sysctl_expire_nodest_conn(ipvs))
1527		queue_delayed_work(system_long_wq,
1528				   &ipvs->expire_nodest_conn_work, 1);
1529}
1530
1531void ip_vs_expire_nodest_conn_flush(struct netns_ipvs *ipvs);
1532#else
1533static inline void ip_vs_enqueue_expire_nodest_conns(struct netns_ipvs *ipvs) {}
1534#endif
1535
1536#define IP_VS_DFWD_METHOD(dest) (atomic_read(&(dest)->conn_flags) & \
1537				 IP_VS_CONN_F_FWD_MASK)
1538
1539/* ip_vs_fwd_tag returns the forwarding tag of the connection */
1540#define IP_VS_FWD_METHOD(cp)  (cp->flags & IP_VS_CONN_F_FWD_MASK)
1541
1542static inline char ip_vs_fwd_tag(struct ip_vs_conn *cp)
1543{
1544	char fwd;
1545
1546	switch (IP_VS_FWD_METHOD(cp)) {
1547	case IP_VS_CONN_F_MASQ:
1548		fwd = 'M'; break;
1549	case IP_VS_CONN_F_LOCALNODE:
1550		fwd = 'L'; break;
1551	case IP_VS_CONN_F_TUNNEL:
1552		fwd = 'T'; break;
1553	case IP_VS_CONN_F_DROUTE:
1554		fwd = 'R'; break;
1555	case IP_VS_CONN_F_BYPASS:
1556		fwd = 'B'; break;
1557	default:
1558		fwd = '?'; break;
1559	}
1560	return fwd;
1561}
1562
1563void ip_vs_nat_icmp(struct sk_buff *skb, struct ip_vs_protocol *pp,
1564		    struct ip_vs_conn *cp, int dir);
1565
1566#ifdef CONFIG_IP_VS_IPV6
1567void ip_vs_nat_icmp_v6(struct sk_buff *skb, struct ip_vs_protocol *pp,
1568		       struct ip_vs_conn *cp, int dir);
1569#endif
1570
1571__sum16 ip_vs_checksum_complete(struct sk_buff *skb, int offset);
1572
1573static inline __wsum ip_vs_check_diff4(__be32 old, __be32 new, __wsum oldsum)
1574{
1575	__be32 diff[2] = { ~old, new };
1576
1577	return csum_partial(diff, sizeof(diff), oldsum);
1578}
1579
1580#ifdef CONFIG_IP_VS_IPV6
1581static inline __wsum ip_vs_check_diff16(const __be32 *old, const __be32 *new,
1582					__wsum oldsum)
1583{
1584	__be32 diff[8] = { ~old[3], ~old[2], ~old[1], ~old[0],
1585			    new[3],  new[2],  new[1],  new[0] };
1586
1587	return csum_partial(diff, sizeof(diff), oldsum);
1588}
1589#endif
1590
1591static inline __wsum ip_vs_check_diff2(__be16 old, __be16 new, __wsum oldsum)
1592{
1593	__be16 diff[2] = { ~old, new };
1594
1595	return csum_partial(diff, sizeof(diff), oldsum);
1596}
1597
1598/* Forget current conntrack (unconfirmed) and attach notrack entry */
1599static inline void ip_vs_notrack(struct sk_buff *skb)
1600{
1601#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
1602	enum ip_conntrack_info ctinfo;
1603	struct nf_conn *ct = nf_ct_get(skb, &ctinfo);
1604
1605	if (ct) {
1606		nf_conntrack_put(&ct->ct_general);
1607		nf_ct_set(skb, NULL, IP_CT_UNTRACKED);
1608	}
1609#endif
1610}
1611
1612#ifdef CONFIG_IP_VS_NFCT
1613/* Netfilter connection tracking
1614 * (from ip_vs_nfct.c)
1615 */
1616static inline int ip_vs_conntrack_enabled(struct netns_ipvs *ipvs)
1617{
1618#ifdef CONFIG_SYSCTL
1619	return ipvs->sysctl_conntrack;
1620#else
1621	return 0;
1622#endif
1623}
1624
1625void ip_vs_update_conntrack(struct sk_buff *skb, struct ip_vs_conn *cp,
1626			    int outin);
1627int ip_vs_confirm_conntrack(struct sk_buff *skb);
1628void ip_vs_nfct_expect_related(struct sk_buff *skb, struct nf_conn *ct,
1629			       struct ip_vs_conn *cp, u_int8_t proto,
1630			       const __be16 port, int from_rs);
1631void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp);
1632
1633#else
1634
1635static inline int ip_vs_conntrack_enabled(struct netns_ipvs *ipvs)
1636{
1637	return 0;
1638}
1639
1640static inline void ip_vs_update_conntrack(struct sk_buff *skb,
1641					  struct ip_vs_conn *cp, int outin)
1642{
1643}
1644
1645static inline int ip_vs_confirm_conntrack(struct sk_buff *skb)
1646{
1647	return NF_ACCEPT;
1648}
1649
1650static inline void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp)
1651{
1652}
1653#endif /* CONFIG_IP_VS_NFCT */
1654
1655/* Using old conntrack that can not be redirected to another real server? */
1656static inline bool ip_vs_conn_uses_old_conntrack(struct ip_vs_conn *cp,
1657						 struct sk_buff *skb)
1658{
1659#ifdef CONFIG_IP_VS_NFCT
1660	enum ip_conntrack_info ctinfo;
1661	struct nf_conn *ct;
1662
 
 
1663	ct = nf_ct_get(skb, &ctinfo);
1664	if (ct && nf_ct_is_confirmed(ct))
1665		return true;
1666#endif
1667	return false;
1668}
1669
1670static inline int ip_vs_register_conntrack(struct ip_vs_service *svc)
1671{
1672#if IS_ENABLED(CONFIG_NF_CONNTRACK)
1673	int afmask = (svc->af == AF_INET6) ? 2 : 1;
1674	int ret = 0;
1675
1676	if (!(svc->conntrack_afmask & afmask)) {
1677		ret = nf_ct_netns_get(svc->ipvs->net, svc->af);
1678		if (ret >= 0)
1679			svc->conntrack_afmask |= afmask;
1680	}
1681	return ret;
1682#else
1683	return 0;
1684#endif
1685}
1686
1687static inline void ip_vs_unregister_conntrack(struct ip_vs_service *svc)
1688{
1689#if IS_ENABLED(CONFIG_NF_CONNTRACK)
1690	int afmask = (svc->af == AF_INET6) ? 2 : 1;
1691
1692	if (svc->conntrack_afmask & afmask) {
1693		nf_ct_netns_put(svc->ipvs->net, svc->af);
1694		svc->conntrack_afmask &= ~afmask;
1695	}
1696#endif
1697}
1698
1699int ip_vs_register_hooks(struct netns_ipvs *ipvs, unsigned int af);
1700void ip_vs_unregister_hooks(struct netns_ipvs *ipvs, unsigned int af);
1701
1702static inline int
1703ip_vs_dest_conn_overhead(struct ip_vs_dest *dest)
1704{
1705	/* We think the overhead of processing active connections is 256
1706	 * times higher than that of inactive connections in average. (This
1707	 * 256 times might not be accurate, we will change it later) We
1708	 * use the following formula to estimate the overhead now:
1709	 *		  dest->activeconns*256 + dest->inactconns
1710	 */
1711	return (atomic_read(&dest->activeconns) << 8) +
1712		atomic_read(&dest->inactconns);
1713}
1714
1715#ifdef CONFIG_IP_VS_PROTO_TCP
1716INDIRECT_CALLABLE_DECLARE(int
1717	tcp_snat_handler(struct sk_buff *skb, struct ip_vs_protocol *pp,
1718			 struct ip_vs_conn *cp, struct ip_vs_iphdr *iph));
1719#endif
1720
1721#ifdef CONFIG_IP_VS_PROTO_UDP
1722INDIRECT_CALLABLE_DECLARE(int
1723	udp_snat_handler(struct sk_buff *skb, struct ip_vs_protocol *pp,
1724			 struct ip_vs_conn *cp, struct ip_vs_iphdr *iph));
1725#endif
1726#endif	/* _NET_IP_VS_H */