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#include <linux/sched/isolation.h>
  33
  34#define IP_VS_HDR_INVERSE	1
  35#define IP_VS_HDR_ICMP		2
  36
  37/* Generic access of ipvs struct */
  38static inline struct netns_ipvs *net_ipvs(struct net* net)
  39{
  40	return net->ipvs;
  41}
  42
  43/* Connections' size value needed by ip_vs_ctl.c */
  44extern int ip_vs_conn_tab_size;
  45
  46extern struct mutex __ip_vs_mutex;
  47
  48struct ip_vs_iphdr {
  49	int hdr_flags;	/* ipvs flags */
  50	__u32 off;	/* Where IP or IPv4 header starts */
  51	__u32 len;	/* IPv4 simply where L4 starts
  52			 * IPv6 where L4 Transport Header starts */
  53	__u16 fragoffs; /* IPv6 fragment offset, 0 if first frag (or not frag)*/
  54	__s16 protocol;
  55	__s32 flags;
  56	union nf_inet_addr saddr;
  57	union nf_inet_addr daddr;
  58};
  59
  60static inline void *frag_safe_skb_hp(const struct sk_buff *skb, int offset,
  61				      int len, void *buffer)
  62{
  63	return skb_header_pointer(skb, offset, len, buffer);
  64}
  65
  66/* This function handles filling *ip_vs_iphdr, both for IPv4 and IPv6.
  67 * IPv6 requires some extra work, as finding proper header position,
  68 * depend on the IPv6 extension headers.
  69 */
  70static inline int
  71ip_vs_fill_iph_skb_off(int af, const struct sk_buff *skb, int offset,
  72		       int hdr_flags, struct ip_vs_iphdr *iphdr)
  73{
  74	iphdr->hdr_flags = hdr_flags;
  75	iphdr->off = offset;
  76
  77#ifdef CONFIG_IP_VS_IPV6
  78	if (af == AF_INET6) {
  79		struct ipv6hdr _iph;
  80		const struct ipv6hdr *iph = skb_header_pointer(
  81			skb, offset, sizeof(_iph), &_iph);
  82		if (!iph)
  83			return 0;
  84
  85		iphdr->saddr.in6 = iph->saddr;
  86		iphdr->daddr.in6 = iph->daddr;
  87		/* ipv6_find_hdr() updates len, flags */
  88		iphdr->len	 = offset;
  89		iphdr->flags	 = 0;
  90		iphdr->protocol  = ipv6_find_hdr(skb, &iphdr->len, -1,
  91						 &iphdr->fragoffs,
  92						 &iphdr->flags);
  93		if (iphdr->protocol < 0)
  94			return 0;
  95	} else
  96#endif
  97	{
  98		struct iphdr _iph;
  99		const struct iphdr *iph = skb_header_pointer(
 100			skb, offset, sizeof(_iph), &_iph);
 101		if (!iph)
 102			return 0;
 103
 104		iphdr->len	= offset + iph->ihl * 4;
 105		iphdr->fragoffs	= 0;
 106		iphdr->protocol	= iph->protocol;
 107		iphdr->saddr.ip	= iph->saddr;
 108		iphdr->daddr.ip	= iph->daddr;
 109	}
 110
 111	return 1;
 112}
 113
 114static inline int
 115ip_vs_fill_iph_skb_icmp(int af, const struct sk_buff *skb, int offset,
 116			bool inverse, struct ip_vs_iphdr *iphdr)
 117{
 118	int hdr_flags = IP_VS_HDR_ICMP;
 119
 120	if (inverse)
 121		hdr_flags |= IP_VS_HDR_INVERSE;
 122
 123	return ip_vs_fill_iph_skb_off(af, skb, offset, hdr_flags, iphdr);
 124}
 125
 126static inline int
 127ip_vs_fill_iph_skb(int af, const struct sk_buff *skb, bool inverse,
 128		   struct ip_vs_iphdr *iphdr)
 129{
 130	int hdr_flags = 0;
 131
 132	if (inverse)
 133		hdr_flags |= IP_VS_HDR_INVERSE;
 134
 135	return ip_vs_fill_iph_skb_off(af, skb, skb_network_offset(skb),
 136				      hdr_flags, iphdr);
 137}
 138
 139static inline bool
 140ip_vs_iph_inverse(const struct ip_vs_iphdr *iph)
 141{
 142	return !!(iph->hdr_flags & IP_VS_HDR_INVERSE);
 143}
 144
 145static inline bool
 146ip_vs_iph_icmp(const struct ip_vs_iphdr *iph)
 147{
 148	return !!(iph->hdr_flags & IP_VS_HDR_ICMP);
 149}
 150
 151static inline void ip_vs_addr_copy(int af, union nf_inet_addr *dst,
 152				   const union nf_inet_addr *src)
 153{
 154#ifdef CONFIG_IP_VS_IPV6
 155	if (af == AF_INET6)
 156		dst->in6 = src->in6;
 157	else
 158#endif
 159	dst->ip = src->ip;
 160}
 161
 162static inline void ip_vs_addr_set(int af, union nf_inet_addr *dst,
 163				  const union nf_inet_addr *src)
 164{
 165#ifdef CONFIG_IP_VS_IPV6
 166	if (af == AF_INET6) {
 167		dst->in6 = src->in6;
 168		return;
 169	}
 170#endif
 171	dst->ip = src->ip;
 172	dst->all[1] = 0;
 173	dst->all[2] = 0;
 174	dst->all[3] = 0;
 175}
 176
 177static inline int ip_vs_addr_equal(int af, const union nf_inet_addr *a,
 178				   const union nf_inet_addr *b)
 179{
 180#ifdef CONFIG_IP_VS_IPV6
 181	if (af == AF_INET6)
 182		return ipv6_addr_equal(&a->in6, &b->in6);
 183#endif
 184	return a->ip == b->ip;
 185}
 186
 187#ifdef CONFIG_IP_VS_DEBUG
 188#include <linux/net.h>
 189
 190int ip_vs_get_debug_level(void);
 191
 192static inline const char *ip_vs_dbg_addr(int af, char *buf, size_t buf_len,
 193					 const union nf_inet_addr *addr,
 194					 int *idx)
 195{
 196	int len;
 197#ifdef CONFIG_IP_VS_IPV6
 198	if (af == AF_INET6)
 199		len = snprintf(&buf[*idx], buf_len - *idx, "[%pI6c]",
 200			       &addr->in6) + 1;
 201	else
 202#endif
 203		len = snprintf(&buf[*idx], buf_len - *idx, "%pI4",
 204			       &addr->ip) + 1;
 205
 206	*idx += len;
 207	BUG_ON(*idx > buf_len + 1);
 208	return &buf[*idx - len];
 209}
 210
 211#define IP_VS_DBG_BUF(level, msg, ...)					\
 212	do {								\
 213		char ip_vs_dbg_buf[160];				\
 214		int ip_vs_dbg_idx = 0;					\
 215		if (level <= ip_vs_get_debug_level())			\
 216			printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__);	\
 217	} while (0)
 218#define IP_VS_ERR_BUF(msg...)						\
 219	do {								\
 220		char ip_vs_dbg_buf[160];				\
 221		int ip_vs_dbg_idx = 0;					\
 222		pr_err(msg);						\
 223	} while (0)
 224
 225/* Only use from within IP_VS_DBG_BUF() or IP_VS_ERR_BUF macros */
 226#define IP_VS_DBG_ADDR(af, addr)					\
 227	ip_vs_dbg_addr(af, ip_vs_dbg_buf,				\
 228		       sizeof(ip_vs_dbg_buf), addr,			\
 229		       &ip_vs_dbg_idx)
 230
 231#define IP_VS_DBG(level, msg, ...)					\
 232	do {								\
 233		if (level <= ip_vs_get_debug_level())			\
 234			printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__);	\
 235	} while (0)
 236#define IP_VS_DBG_RL(msg, ...)						\
 237	do {								\
 238		if (net_ratelimit())					\
 239			printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__);	\
 240	} while (0)
 241#define IP_VS_DBG_PKT(level, af, pp, skb, ofs, msg)			\
 242	do {								\
 243		if (level <= ip_vs_get_debug_level())			\
 244			pp->debug_packet(af, pp, skb, ofs, msg);	\
 245	} while (0)
 246#define IP_VS_DBG_RL_PKT(level, af, pp, skb, ofs, msg)			\
 247	do {								\
 248		if (level <= ip_vs_get_debug_level() &&			\
 249		    net_ratelimit())					\
 250			pp->debug_packet(af, pp, skb, ofs, msg);	\
 251	} while (0)
 252#else	/* NO DEBUGGING at ALL */
 253#define IP_VS_DBG_BUF(level, msg...)  do {} while (0)
 254#define IP_VS_ERR_BUF(msg...)  do {} while (0)
 255#define IP_VS_DBG(level, msg...)  do {} while (0)
 256#define IP_VS_DBG_RL(msg...)  do {} while (0)
 257#define IP_VS_DBG_PKT(level, af, pp, skb, ofs, msg)	do {} while (0)
 258#define IP_VS_DBG_RL_PKT(level, af, pp, skb, ofs, msg)	do {} while (0)
 259#endif
 260
 261#define IP_VS_BUG() BUG()
 262#define IP_VS_ERR_RL(msg, ...)						\
 263	do {								\
 264		if (net_ratelimit())					\
 265			pr_err(msg, ##__VA_ARGS__);			\
 266	} while (0)
 267
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 268/* The port number of FTP service (in network order). */
 269#define FTPPORT  cpu_to_be16(21)
 270#define FTPDATA  cpu_to_be16(20)
 271
 272/* TCP State Values */
 273enum {
 274	IP_VS_TCP_S_NONE = 0,
 275	IP_VS_TCP_S_ESTABLISHED,
 276	IP_VS_TCP_S_SYN_SENT,
 277	IP_VS_TCP_S_SYN_RECV,
 278	IP_VS_TCP_S_FIN_WAIT,
 279	IP_VS_TCP_S_TIME_WAIT,
 280	IP_VS_TCP_S_CLOSE,
 281	IP_VS_TCP_S_CLOSE_WAIT,
 282	IP_VS_TCP_S_LAST_ACK,
 283	IP_VS_TCP_S_LISTEN,
 284	IP_VS_TCP_S_SYNACK,
 285	IP_VS_TCP_S_LAST
 286};
 287
 288/* UDP State Values */
 289enum {
 290	IP_VS_UDP_S_NORMAL,
 291	IP_VS_UDP_S_LAST,
 292};
 293
 294/* ICMP State Values */
 295enum {
 296	IP_VS_ICMP_S_NORMAL,
 297	IP_VS_ICMP_S_LAST,
 298};
 299
 300/* SCTP State Values */
 301enum ip_vs_sctp_states {
 302	IP_VS_SCTP_S_NONE,
 303	IP_VS_SCTP_S_INIT1,
 304	IP_VS_SCTP_S_INIT,
 305	IP_VS_SCTP_S_COOKIE_SENT,
 306	IP_VS_SCTP_S_COOKIE_REPLIED,
 307	IP_VS_SCTP_S_COOKIE_WAIT,
 308	IP_VS_SCTP_S_COOKIE,
 309	IP_VS_SCTP_S_COOKIE_ECHOED,
 310	IP_VS_SCTP_S_ESTABLISHED,
 311	IP_VS_SCTP_S_SHUTDOWN_SENT,
 312	IP_VS_SCTP_S_SHUTDOWN_RECEIVED,
 313	IP_VS_SCTP_S_SHUTDOWN_ACK_SENT,
 314	IP_VS_SCTP_S_REJECTED,
 315	IP_VS_SCTP_S_CLOSED,
 316	IP_VS_SCTP_S_LAST
 317};
 318
 319/* Connection templates use bits from state */
 320#define IP_VS_CTPL_S_NONE		0x0000
 321#define IP_VS_CTPL_S_ASSURED		0x0001
 322#define IP_VS_CTPL_S_LAST		0x0002
 323
 324/* Delta sequence info structure
 325 * Each ip_vs_conn has 2 (output AND input seq. changes).
 326 * Only used in the VS/NAT.
 327 */
 328struct ip_vs_seq {
 329	__u32			init_seq;	/* Add delta from this seq */
 330	__u32			delta;		/* Delta in sequence numbers */
 331	__u32			previous_delta;	/* Delta in sequence numbers
 332						 * before last resized pkt */
 333};
 334
 335/* counters per cpu */
 336struct ip_vs_counters {
 337	u64_stats_t	conns;		/* connections scheduled */
 338	u64_stats_t	inpkts;		/* incoming packets */
 339	u64_stats_t	outpkts;	/* outgoing packets */
 340	u64_stats_t	inbytes;	/* incoming bytes */
 341	u64_stats_t	outbytes;	/* outgoing bytes */
 342};
 343/* Stats per cpu */
 344struct ip_vs_cpu_stats {
 345	struct ip_vs_counters   cnt;
 346	struct u64_stats_sync   syncp;
 347};
 348
 349/* Default nice for estimator kthreads */
 350#define IPVS_EST_NICE		0
 351
 352/* IPVS statistics objects */
 353struct ip_vs_estimator {
 354	struct hlist_node	list;
 355
 356	u64			last_inbytes;
 357	u64			last_outbytes;
 358	u64			last_conns;
 359	u64			last_inpkts;
 360	u64			last_outpkts;
 361
 362	u64			cps;
 363	u64			inpps;
 364	u64			outpps;
 365	u64			inbps;
 366	u64			outbps;
 367
 368	s32			ktid:16,	/* kthread ID, -1=temp list */
 369				ktrow:8,	/* row/tick ID for kthread */
 370				ktcid:8;	/* chain ID for kthread tick */
 371};
 372
 373/*
 374 * IPVS statistics object, 64-bit kernel version of struct ip_vs_stats_user
 375 */
 376struct ip_vs_kstats {
 377	u64			conns;		/* connections scheduled */
 378	u64			inpkts;		/* incoming packets */
 379	u64			outpkts;	/* outgoing packets */
 380	u64			inbytes;	/* incoming bytes */
 381	u64			outbytes;	/* outgoing bytes */
 382
 383	u64			cps;		/* current connection rate */
 384	u64			inpps;		/* current in packet rate */
 385	u64			outpps;		/* current out packet rate */
 386	u64			inbps;		/* current in byte rate */
 387	u64			outbps;		/* current out byte rate */
 388};
 389
 390struct ip_vs_stats {
 391	struct ip_vs_kstats	kstats;		/* kernel statistics */
 392	struct ip_vs_estimator	est;		/* estimator */
 393	struct ip_vs_cpu_stats __percpu	*cpustats;	/* per cpu counters */
 394	spinlock_t		lock;		/* spin lock */
 395	struct ip_vs_kstats	kstats0;	/* reset values */
 396};
 397
 398struct ip_vs_stats_rcu {
 399	struct ip_vs_stats	s;
 400	struct rcu_head		rcu_head;
 401};
 402
 403int ip_vs_stats_init_alloc(struct ip_vs_stats *s);
 404struct ip_vs_stats *ip_vs_stats_alloc(void);
 405void ip_vs_stats_release(struct ip_vs_stats *stats);
 406void ip_vs_stats_free(struct ip_vs_stats *stats);
 407
 408/* Process estimators in multiple timer ticks (20/50/100, see ktrow) */
 409#define IPVS_EST_NTICKS		50
 410/* Estimation uses a 2-second period containing ticks (in jiffies) */
 411#define IPVS_EST_TICK		((2 * HZ) / IPVS_EST_NTICKS)
 412
 413/* Limit of CPU load per kthread (8 for 12.5%), ratio of CPU capacity (1/C).
 414 * Value of 4 and above ensures kthreads will take work without exceeding
 415 * the CPU capacity under different circumstances.
 416 */
 417#define IPVS_EST_LOAD_DIVISOR	8
 418
 419/* Kthreads should not have work that exceeds the CPU load above 50% */
 420#define IPVS_EST_CPU_KTHREADS	(IPVS_EST_LOAD_DIVISOR / 2)
 421
 422/* Desired number of chains per timer tick (chain load factor in 100us units),
 423 * 48=4.8ms of 40ms tick (12% CPU usage):
 424 * 2 sec * 1000 ms in sec * 10 (100us in ms) / 8 (12.5%) / 50
 425 */
 426#define IPVS_EST_CHAIN_FACTOR	\
 427	ALIGN_DOWN(2 * 1000 * 10 / IPVS_EST_LOAD_DIVISOR / IPVS_EST_NTICKS, 8)
 428
 429/* Compiled number of chains per tick
 430 * The defines should match cond_resched_rcu
 431 */
 432#if defined(CONFIG_DEBUG_ATOMIC_SLEEP) || !defined(CONFIG_PREEMPT_RCU)
 433#define IPVS_EST_TICK_CHAINS	IPVS_EST_CHAIN_FACTOR
 434#else
 435#define IPVS_EST_TICK_CHAINS	1
 436#endif
 437
 438#if IPVS_EST_NTICKS > 127
 439#error Too many timer ticks for ktrow
 440#endif
 441
 442/* Multiple chains processed in same tick */
 443struct ip_vs_est_tick_data {
 444	struct rcu_head		rcu_head;
 445	struct hlist_head	chains[IPVS_EST_TICK_CHAINS];
 446	DECLARE_BITMAP(present, IPVS_EST_TICK_CHAINS);
 447	DECLARE_BITMAP(full, IPVS_EST_TICK_CHAINS);
 448	int			chain_len[IPVS_EST_TICK_CHAINS];
 449};
 450
 451/* Context for estimation kthread */
 452struct ip_vs_est_kt_data {
 453	struct netns_ipvs	*ipvs;
 454	struct task_struct	*task;		/* task if running */
 455	struct ip_vs_est_tick_data __rcu *ticks[IPVS_EST_NTICKS];
 456	DECLARE_BITMAP(avail, IPVS_EST_NTICKS);	/* tick has space for ests */
 457	unsigned long		est_timer;	/* estimation timer (jiffies) */
 458	struct ip_vs_stats	*calc_stats;	/* Used for calculation */
 459	int			tick_len[IPVS_EST_NTICKS];	/* est count */
 460	int			id;		/* ktid per netns */
 461	int			chain_max;	/* max ests per tick chain */
 462	int			tick_max;	/* max ests per tick */
 463	int			est_count;	/* attached ests to kthread */
 464	int			est_max_count;	/* max ests per kthread */
 465	int			add_row;	/* row for new ests */
 466	int			est_row;	/* estimated row */
 467};
 468
 469struct dst_entry;
 470struct iphdr;
 471struct ip_vs_conn;
 472struct ip_vs_app;
 473struct sk_buff;
 474struct ip_vs_proto_data;
 475
 476struct ip_vs_protocol {
 477	struct ip_vs_protocol	*next;
 478	char			*name;
 479	u16			protocol;
 480	u16			num_states;
 481	int			dont_defrag;
 482
 483	void (*init)(struct ip_vs_protocol *pp);
 484
 485	void (*exit)(struct ip_vs_protocol *pp);
 486
 487	int (*init_netns)(struct netns_ipvs *ipvs, struct ip_vs_proto_data *pd);
 488
 489	void (*exit_netns)(struct netns_ipvs *ipvs, struct ip_vs_proto_data *pd);
 490
 491	int (*conn_schedule)(struct netns_ipvs *ipvs,
 492			     int af, struct sk_buff *skb,
 493			     struct ip_vs_proto_data *pd,
 494			     int *verdict, struct ip_vs_conn **cpp,
 495			     struct ip_vs_iphdr *iph);
 496
 497	struct ip_vs_conn *
 498	(*conn_in_get)(struct netns_ipvs *ipvs,
 499		       int af,
 500		       const struct sk_buff *skb,
 501		       const struct ip_vs_iphdr *iph);
 502
 503	struct ip_vs_conn *
 504	(*conn_out_get)(struct netns_ipvs *ipvs,
 505			int af,
 506			const struct sk_buff *skb,
 507			const struct ip_vs_iphdr *iph);
 508
 509	int (*snat_handler)(struct sk_buff *skb, struct ip_vs_protocol *pp,
 510			    struct ip_vs_conn *cp, struct ip_vs_iphdr *iph);
 511
 512	int (*dnat_handler)(struct sk_buff *skb, struct ip_vs_protocol *pp,
 513			    struct ip_vs_conn *cp, struct ip_vs_iphdr *iph);
 514
 515	const char *(*state_name)(int state);
 516
 517	void (*state_transition)(struct ip_vs_conn *cp, int direction,
 518				 const struct sk_buff *skb,
 519				 struct ip_vs_proto_data *pd);
 520
 521	int (*register_app)(struct netns_ipvs *ipvs, struct ip_vs_app *inc);
 522
 523	void (*unregister_app)(struct netns_ipvs *ipvs, struct ip_vs_app *inc);
 524
 525	int (*app_conn_bind)(struct ip_vs_conn *cp);
 526
 527	void (*debug_packet)(int af, struct ip_vs_protocol *pp,
 528			     const struct sk_buff *skb,
 529			     int offset,
 530			     const char *msg);
 531
 532	void (*timeout_change)(struct ip_vs_proto_data *pd, int flags);
 533};
 534
 535/* protocol data per netns */
 536struct ip_vs_proto_data {
 537	struct ip_vs_proto_data	*next;
 538	struct ip_vs_protocol	*pp;
 539	int			*timeout_table;	/* protocol timeout table */
 540	atomic_t		appcnt;		/* counter of proto app incs. */
 541	struct tcp_states_t	*tcp_state_table;
 542};
 543
 544struct ip_vs_protocol   *ip_vs_proto_get(unsigned short proto);
 545struct ip_vs_proto_data *ip_vs_proto_data_get(struct netns_ipvs *ipvs,
 546					      unsigned short proto);
 547
 548struct ip_vs_conn_param {
 549	struct netns_ipvs		*ipvs;
 550	const union nf_inet_addr	*caddr;
 551	const union nf_inet_addr	*vaddr;
 552	__be16				cport;
 553	__be16				vport;
 554	__u16				protocol;
 555	u16				af;
 556
 557	const struct ip_vs_pe		*pe;
 558	char				*pe_data;
 559	__u8				pe_data_len;
 560};
 561
 562/* IP_VS structure allocated for each dynamically scheduled connection */
 563struct ip_vs_conn {
 564	struct hlist_node	c_list;         /* hashed list heads */
 565	/* Protocol, addresses and port numbers */
 566	__be16                  cport;
 567	__be16                  dport;
 568	__be16                  vport;
 569	u16			af;		/* address family */
 570	union nf_inet_addr      caddr;          /* client address */
 571	union nf_inet_addr      vaddr;          /* virtual address */
 572	union nf_inet_addr      daddr;          /* destination address */
 573	volatile __u32          flags;          /* status flags */
 574	__u16                   protocol;       /* Which protocol (TCP/UDP) */
 575	__u16			daf;		/* Address family of the dest */
 576	struct netns_ipvs	*ipvs;
 577
 578	/* counter and timer */
 579	refcount_t		refcnt;		/* reference count */
 580	struct timer_list	timer;		/* Expiration timer */
 581	volatile unsigned long	timeout;	/* timeout */
 582
 583	/* Flags and state transition */
 584	spinlock_t              lock;           /* lock for state transition */
 585	volatile __u16          state;          /* state info */
 586	volatile __u16          old_state;      /* old state, to be used for
 587						 * state transition triggered
 588						 * synchronization
 589						 */
 590	__u32			fwmark;		/* Fire wall mark from skb */
 591	unsigned long		sync_endtime;	/* jiffies + sent_retries */
 592
 593	/* Control members */
 594	struct ip_vs_conn       *control;       /* Master control connection */
 595	atomic_t                n_control;      /* Number of controlled ones */
 596	struct ip_vs_dest       *dest;          /* real server */
 597	atomic_t                in_pkts;        /* incoming packet counter */
 598
 599	/* Packet transmitter for different forwarding methods.  If it
 600	 * mangles the packet, it must return NF_DROP or better NF_STOLEN,
 601	 * otherwise this must be changed to a sk_buff **.
 602	 * NF_ACCEPT can be returned when destination is local.
 603	 */
 604	int (*packet_xmit)(struct sk_buff *skb, struct ip_vs_conn *cp,
 605			   struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
 606
 607	/* Note: we can group the following members into a structure,
 608	 * in order to save more space, and the following members are
 609	 * only used in VS/NAT anyway
 610	 */
 611	struct ip_vs_app        *app;           /* bound ip_vs_app object */
 612	void                    *app_data;      /* Application private data */
 613	struct_group(sync_conn_opt,
 614		struct ip_vs_seq  in_seq;       /* incoming seq. struct */
 615		struct ip_vs_seq  out_seq;      /* outgoing seq. struct */
 616	);
 617
 618	const struct ip_vs_pe	*pe;
 619	char			*pe_data;
 620	__u8			pe_data_len;
 621
 622	struct rcu_head		rcu_head;
 623};
 624
 625/* Extended internal versions of struct ip_vs_service_user and ip_vs_dest_user
 626 * for IPv6 support.
 627 *
 628 * We need these to conveniently pass around service and destination
 629 * options, but unfortunately, we also need to keep the old definitions to
 630 * maintain userspace backwards compatibility for the setsockopt interface.
 631 */
 632struct ip_vs_service_user_kern {
 633	/* virtual service addresses */
 634	u16			af;
 635	u16			protocol;
 636	union nf_inet_addr	addr;		/* virtual ip address */
 637	__be16			port;
 638	u32			fwmark;		/* firewall mark of service */
 639
 640	/* virtual service options */
 641	char			*sched_name;
 642	char			*pe_name;
 643	unsigned int		flags;		/* virtual service flags */
 644	unsigned int		timeout;	/* persistent timeout in sec */
 645	__be32			netmask;	/* persistent netmask or plen */
 646};
 647
 648
 649struct ip_vs_dest_user_kern {
 650	/* destination server address */
 651	union nf_inet_addr	addr;
 652	__be16			port;
 653
 654	/* real server options */
 655	unsigned int		conn_flags;	/* connection flags */
 656	int			weight;		/* destination weight */
 657
 658	/* thresholds for active connections */
 659	u32			u_threshold;	/* upper threshold */
 660	u32			l_threshold;	/* lower threshold */
 661
 662	/* Address family of addr */
 663	u16			af;
 664
 665	u16			tun_type;	/* tunnel type */
 666	__be16			tun_port;	/* tunnel port */
 667	u16			tun_flags;	/* tunnel flags */
 668};
 669
 670
 671/*
 672 * The information about the virtual service offered to the net and the
 673 * forwarding entries.
 674 */
 675struct ip_vs_service {
 676	struct hlist_node	s_list;   /* for normal service table */
 677	struct hlist_node	f_list;   /* for fwmark-based service table */
 678	atomic_t		refcnt;   /* reference counter */
 679
 680	u16			af;       /* address family */
 681	__u16			protocol; /* which protocol (TCP/UDP) */
 682	union nf_inet_addr	addr;	  /* IP address for virtual service */
 683	__be16			port;	  /* port number for the service */
 684	__u32                   fwmark;   /* firewall mark of the service */
 685	unsigned int		flags;	  /* service status flags */
 686	unsigned int		timeout;  /* persistent timeout in ticks */
 687	__be32			netmask;  /* grouping granularity, mask/plen */
 688	struct netns_ipvs	*ipvs;
 689
 690	struct list_head	destinations;  /* real server d-linked list */
 691	__u32			num_dests;     /* number of servers */
 692	struct ip_vs_stats      stats;         /* statistics for the service */
 693
 694	/* for scheduling */
 695	struct ip_vs_scheduler __rcu *scheduler; /* bound scheduler object */
 696	spinlock_t		sched_lock;    /* lock sched_data */
 697	void			*sched_data;   /* scheduler application data */
 698
 699	/* alternate persistence engine */
 700	struct ip_vs_pe __rcu	*pe;
 701	int			conntrack_afmask;
 702
 703	struct rcu_head		rcu_head;
 704};
 705
 706/* Information for cached dst */
 707struct ip_vs_dest_dst {
 708	struct dst_entry	*dst_cache;	/* destination cache entry */
 709	u32			dst_cookie;
 710	union nf_inet_addr	dst_saddr;
 711	struct rcu_head		rcu_head;
 712};
 713
 714/* The real server destination forwarding entry with ip address, port number,
 715 * and so on.
 716 */
 717struct ip_vs_dest {
 718	struct list_head	n_list;   /* for the dests in the service */
 719	struct hlist_node	d_list;   /* for table with all the dests */
 720
 721	u16			af;		/* address family */
 722	__be16			port;		/* port number of the server */
 723	union nf_inet_addr	addr;		/* IP address of the server */
 724	volatile unsigned int	flags;		/* dest status flags */
 725	atomic_t		conn_flags;	/* flags to copy to conn */
 726	atomic_t		weight;		/* server weight */
 727	atomic_t		last_weight;	/* server latest weight */
 728	__u16			tun_type;	/* tunnel type */
 729	__be16			tun_port;	/* tunnel port */
 730	__u16			tun_flags;	/* tunnel flags */
 731
 732	refcount_t		refcnt;		/* reference counter */
 733	struct ip_vs_stats      stats;          /* statistics */
 734	unsigned long		idle_start;	/* start time, jiffies */
 735
 736	/* connection counters and thresholds */
 737	atomic_t		activeconns;	/* active connections */
 738	atomic_t		inactconns;	/* inactive connections */
 739	atomic_t		persistconns;	/* persistent connections */
 740	__u32			u_threshold;	/* upper threshold */
 741	__u32			l_threshold;	/* lower threshold */
 742
 743	/* for destination cache */
 744	spinlock_t		dst_lock;	/* lock of dst_cache */
 745	struct ip_vs_dest_dst __rcu *dest_dst;	/* cached dst info */
 746
 747	/* for virtual service */
 748	struct ip_vs_service __rcu *svc;	/* service it belongs to */
 749	__u16			protocol;	/* which protocol (TCP/UDP) */
 750	__be16			vport;		/* virtual port number */
 751	union nf_inet_addr	vaddr;		/* virtual IP address */
 752	__u32			vfwmark;	/* firewall mark of service */
 753
 754	struct rcu_head		rcu_head;
 755	struct list_head	t_list;		/* in dest_trash */
 756	unsigned int		in_rs_table:1;	/* we are in rs_table */
 757};
 758
 759/* The scheduler object */
 760struct ip_vs_scheduler {
 761	struct list_head	n_list;		/* d-linked list head */
 762	char			*name;		/* scheduler name */
 763	atomic_t		refcnt;		/* reference counter */
 764	struct module		*module;	/* THIS_MODULE/NULL */
 765
 766	/* scheduler initializing service */
 767	int (*init_service)(struct ip_vs_service *svc);
 768	/* scheduling service finish */
 769	void (*done_service)(struct ip_vs_service *svc);
 770	/* dest is linked */
 771	int (*add_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest);
 772	/* dest is unlinked */
 773	int (*del_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest);
 774	/* dest is updated */
 775	int (*upd_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest);
 776
 777	/* selecting a server from the given service */
 778	struct ip_vs_dest* (*schedule)(struct ip_vs_service *svc,
 779				       const struct sk_buff *skb,
 780				       struct ip_vs_iphdr *iph);
 781};
 782
 783/* The persistence engine object */
 784struct ip_vs_pe {
 785	struct list_head	n_list;		/* d-linked list head */
 786	char			*name;		/* scheduler name */
 787	atomic_t		refcnt;		/* reference counter */
 788	struct module		*module;	/* THIS_MODULE/NULL */
 789
 790	/* get the connection template, if any */
 791	int (*fill_param)(struct ip_vs_conn_param *p, struct sk_buff *skb);
 792	bool (*ct_match)(const struct ip_vs_conn_param *p,
 793			 struct ip_vs_conn *ct);
 794	u32 (*hashkey_raw)(const struct ip_vs_conn_param *p, u32 initval,
 795			   bool inverse);
 796	int (*show_pe_data)(const struct ip_vs_conn *cp, char *buf);
 797	/* create connections for real-server outgoing packets */
 798	struct ip_vs_conn* (*conn_out)(struct ip_vs_service *svc,
 799				       struct ip_vs_dest *dest,
 800				       struct sk_buff *skb,
 801				       const struct ip_vs_iphdr *iph,
 802				       __be16 dport, __be16 cport);
 803};
 804
 805/* The application module object (a.k.a. app incarnation) */
 806struct ip_vs_app {
 807	struct list_head	a_list;		/* member in app list */
 808	int			type;		/* IP_VS_APP_TYPE_xxx */
 809	char			*name;		/* application module name */
 810	__u16			protocol;
 811	struct module		*module;	/* THIS_MODULE/NULL */
 812	struct list_head	incs_list;	/* list of incarnations */
 813
 814	/* members for application incarnations */
 815	struct list_head	p_list;		/* member in proto app list */
 816	struct ip_vs_app	*app;		/* its real application */
 817	__be16			port;		/* port number in net order */
 818	atomic_t		usecnt;		/* usage counter */
 819	struct rcu_head		rcu_head;
 820
 821	/* output hook: Process packet in inout direction, diff set for TCP.
 822	 * Return: 0=Error, 1=Payload Not Mangled/Mangled but checksum is ok,
 823	 *	   2=Mangled but checksum was not updated
 824	 */
 825	int (*pkt_out)(struct ip_vs_app *, struct ip_vs_conn *,
 826		       struct sk_buff *, int *diff, struct ip_vs_iphdr *ipvsh);
 827
 828	/* input hook: Process packet in outin direction, diff set for TCP.
 829	 * Return: 0=Error, 1=Payload Not Mangled/Mangled but checksum is ok,
 830	 *	   2=Mangled but checksum was not updated
 831	 */
 832	int (*pkt_in)(struct ip_vs_app *, struct ip_vs_conn *,
 833		      struct sk_buff *, int *diff, struct ip_vs_iphdr *ipvsh);
 834
 835	/* ip_vs_app initializer */
 836	int (*init_conn)(struct ip_vs_app *, struct ip_vs_conn *);
 837
 838	/* ip_vs_app finish */
 839	int (*done_conn)(struct ip_vs_app *, struct ip_vs_conn *);
 840
 841
 842	/* not used now */
 843	int (*bind_conn)(struct ip_vs_app *, struct ip_vs_conn *,
 844			 struct ip_vs_protocol *);
 845
 846	void (*unbind_conn)(struct ip_vs_app *, struct ip_vs_conn *);
 847
 848	int *			timeout_table;
 849	int *			timeouts;
 850	int			timeouts_size;
 851
 852	int (*conn_schedule)(struct sk_buff *skb, struct ip_vs_app *app,
 853			     int *verdict, struct ip_vs_conn **cpp);
 854
 855	struct ip_vs_conn *
 856	(*conn_in_get)(const struct sk_buff *skb, struct ip_vs_app *app,
 857		       const struct iphdr *iph, int inverse);
 858
 859	struct ip_vs_conn *
 860	(*conn_out_get)(const struct sk_buff *skb, struct ip_vs_app *app,
 861			const struct iphdr *iph, int inverse);
 862
 863	int (*state_transition)(struct ip_vs_conn *cp, int direction,
 864				const struct sk_buff *skb,
 865				struct ip_vs_app *app);
 866
 867	void (*timeout_change)(struct ip_vs_app *app, int flags);
 868};
 869
 870struct ipvs_master_sync_state {
 871	struct list_head	sync_queue;
 872	struct ip_vs_sync_buff	*sync_buff;
 873	unsigned long		sync_queue_len;
 874	unsigned int		sync_queue_delay;
 875	struct delayed_work	master_wakeup_work;
 876	struct netns_ipvs	*ipvs;
 877};
 878
 879struct ip_vs_sync_thread_data;
 880
 881/* How much time to keep dests in trash */
 882#define IP_VS_DEST_TRASH_PERIOD		(120 * HZ)
 883
 884struct ipvs_sync_daemon_cfg {
 885	union nf_inet_addr	mcast_group;
 886	int			syncid;
 887	u16			sync_maxlen;
 888	u16			mcast_port;
 889	u8			mcast_af;
 890	u8			mcast_ttl;
 891	/* multicast interface name */
 892	char			mcast_ifn[IP_VS_IFNAME_MAXLEN];
 893};
 894
 895/* IPVS in network namespace */
 896struct netns_ipvs {
 897	int			gen;		/* Generation */
 898	int			enable;		/* enable like nf_hooks do */
 899	/* Hash table: for real service lookups */
 900	#define IP_VS_RTAB_BITS 4
 901	#define IP_VS_RTAB_SIZE (1 << IP_VS_RTAB_BITS)
 902	#define IP_VS_RTAB_MASK (IP_VS_RTAB_SIZE - 1)
 903
 904	struct hlist_head	rs_table[IP_VS_RTAB_SIZE];
 905	/* ip_vs_app */
 906	struct list_head	app_list;
 907	/* ip_vs_proto */
 908	#define IP_VS_PROTO_TAB_SIZE	32	/* must be power of 2 */
 909	struct ip_vs_proto_data *proto_data_table[IP_VS_PROTO_TAB_SIZE];
 910	/* ip_vs_proto_tcp */
 911#ifdef CONFIG_IP_VS_PROTO_TCP
 912	#define	TCP_APP_TAB_BITS	4
 913	#define	TCP_APP_TAB_SIZE	(1 << TCP_APP_TAB_BITS)
 914	#define	TCP_APP_TAB_MASK	(TCP_APP_TAB_SIZE - 1)
 915	struct list_head	tcp_apps[TCP_APP_TAB_SIZE];
 916#endif
 917	/* ip_vs_proto_udp */
 918#ifdef CONFIG_IP_VS_PROTO_UDP
 919	#define	UDP_APP_TAB_BITS	4
 920	#define	UDP_APP_TAB_SIZE	(1 << UDP_APP_TAB_BITS)
 921	#define	UDP_APP_TAB_MASK	(UDP_APP_TAB_SIZE - 1)
 922	struct list_head	udp_apps[UDP_APP_TAB_SIZE];
 923#endif
 924	/* ip_vs_proto_sctp */
 925#ifdef CONFIG_IP_VS_PROTO_SCTP
 926	#define SCTP_APP_TAB_BITS	4
 927	#define SCTP_APP_TAB_SIZE	(1 << SCTP_APP_TAB_BITS)
 928	#define SCTP_APP_TAB_MASK	(SCTP_APP_TAB_SIZE - 1)
 929	/* Hash table for SCTP application incarnations	 */
 930	struct list_head	sctp_apps[SCTP_APP_TAB_SIZE];
 931#endif
 932	/* ip_vs_conn */
 933	atomic_t		conn_count;      /* connection counter */
 934
 935	/* ip_vs_ctl */
 936	struct ip_vs_stats_rcu	*tot_stats;      /* Statistics & est. */
 937
 938	int			num_services;    /* no of virtual services */
 939	int			num_services6;   /* IPv6 virtual services */
 940
 941	/* Trash for destinations */
 942	struct list_head	dest_trash;
 943	spinlock_t		dest_trash_lock;
 944	struct timer_list	dest_trash_timer; /* expiration timer */
 945	/* Service counters */
 946	atomic_t		ftpsvc_counter;
 947	atomic_t		nullsvc_counter;
 948	atomic_t		conn_out_counter;
 949
 950#ifdef CONFIG_SYSCTL
 951	/* delayed work for expiring no dest connections */
 952	struct delayed_work	expire_nodest_conn_work;
 953	/* 1/rate drop and drop-entry variables */
 954	struct delayed_work	defense_work;   /* Work handler */
 955	int			drop_rate;
 956	int			drop_counter;
 957	int			old_secure_tcp;
 958	atomic_t		dropentry;
 959	/* locks in ctl.c */
 960	spinlock_t		dropentry_lock;  /* drop entry handling */
 961	spinlock_t		droppacket_lock; /* drop packet handling */
 962	spinlock_t		securetcp_lock;  /* state and timeout tables */
 963
 964	/* sys-ctl struct */
 965	struct ctl_table_header	*sysctl_hdr;
 966	struct ctl_table	*sysctl_tbl;
 967#endif
 968
 969	/* sysctl variables */
 970	int			sysctl_amemthresh;
 971	int			sysctl_am_droprate;
 972	int			sysctl_drop_entry;
 973	int			sysctl_drop_packet;
 974	int			sysctl_secure_tcp;
 975#ifdef CONFIG_IP_VS_NFCT
 976	int			sysctl_conntrack;
 977#endif
 978	int			sysctl_snat_reroute;
 979	int			sysctl_sync_ver;
 980	int			sysctl_sync_ports;
 981	int			sysctl_sync_persist_mode;
 982	unsigned long		sysctl_sync_qlen_max;
 983	int			sysctl_sync_sock_size;
 984	int			sysctl_cache_bypass;
 985	int			sysctl_expire_nodest_conn;
 986	int			sysctl_sloppy_tcp;
 987	int			sysctl_sloppy_sctp;
 988	int			sysctl_expire_quiescent_template;
 989	int			sysctl_sync_threshold[2];
 990	unsigned int		sysctl_sync_refresh_period;
 991	int			sysctl_sync_retries;
 992	int			sysctl_nat_icmp_send;
 993	int			sysctl_pmtu_disc;
 994	int			sysctl_backup_only;
 995	int			sysctl_conn_reuse_mode;
 996	int			sysctl_schedule_icmp;
 997	int			sysctl_ignore_tunneled;
 998	int			sysctl_run_estimation;
 999#ifdef CONFIG_SYSCTL
1000	cpumask_var_t		sysctl_est_cpulist;	/* kthread cpumask */
1001	int			est_cpulist_valid;	/* cpulist set */
1002	int			sysctl_est_nice;	/* kthread nice */
1003	int			est_stopped;		/* stop tasks */
1004#endif
1005
1006	/* ip_vs_lblc */
1007	int			sysctl_lblc_expiration;
1008	struct ctl_table_header	*lblc_ctl_header;
1009	struct ctl_table	*lblc_ctl_table;
1010	/* ip_vs_lblcr */
1011	int			sysctl_lblcr_expiration;
1012	struct ctl_table_header	*lblcr_ctl_header;
1013	struct ctl_table	*lblcr_ctl_table;
1014	/* ip_vs_est */
1015	struct delayed_work	est_reload_work;/* Reload kthread tasks */
1016	struct mutex		est_mutex;	/* protect kthread tasks */
1017	struct hlist_head	est_temp_list;	/* Ests during calc phase */
1018	struct ip_vs_est_kt_data **est_kt_arr;	/* Array of kthread data ptrs */
1019	unsigned long		est_max_threads;/* Hard limit of kthreads */
1020	int			est_calc_phase;	/* Calculation phase */
1021	int			est_chain_max;	/* Calculated chain_max */
1022	int			est_kt_count;	/* Allocated ptrs */
1023	int			est_add_ktid;	/* ktid where to add ests */
1024	atomic_t		est_genid;	/* kthreads reload genid */
1025	atomic_t		est_genid_done;	/* applied genid */
1026	/* ip_vs_sync */
1027	spinlock_t		sync_lock;
1028	struct ipvs_master_sync_state *ms;
1029	spinlock_t		sync_buff_lock;
1030	struct ip_vs_sync_thread_data *master_tinfo;
1031	struct ip_vs_sync_thread_data *backup_tinfo;
1032	int			threads_mask;
1033	volatile int		sync_state;
1034	struct mutex		sync_mutex;
1035	struct ipvs_sync_daemon_cfg	mcfg;	/* Master Configuration */
1036	struct ipvs_sync_daemon_cfg	bcfg;	/* Backup Configuration */
1037	/* net name space ptr */
1038	struct net		*net;            /* Needed by timer routines */
1039	/* Number of heterogeneous destinations, needed because heterogeneous
1040	 * are not supported when synchronization is enabled.
1041	 */
1042	unsigned int		mixed_address_family_dests;
1043	unsigned int		hooks_afmask;	/* &1=AF_INET, &2=AF_INET6 */
1044};
1045
1046#define DEFAULT_SYNC_THRESHOLD	3
1047#define DEFAULT_SYNC_PERIOD	50
1048#define DEFAULT_SYNC_VER	1
1049#define DEFAULT_SLOPPY_TCP	0
1050#define DEFAULT_SLOPPY_SCTP	0
1051#define DEFAULT_SYNC_REFRESH_PERIOD	(0U * HZ)
1052#define DEFAULT_SYNC_RETRIES		0
1053#define IPVS_SYNC_WAKEUP_RATE	8
1054#define IPVS_SYNC_QLEN_MAX	(IPVS_SYNC_WAKEUP_RATE * 4)
1055#define IPVS_SYNC_SEND_DELAY	(HZ / 50)
1056#define IPVS_SYNC_CHECK_PERIOD	HZ
1057#define IPVS_SYNC_FLUSH_TIME	(HZ * 2)
1058#define IPVS_SYNC_PORTS_MAX	(1 << 6)
1059
1060#ifdef CONFIG_SYSCTL
1061
1062static inline int sysctl_sync_threshold(struct netns_ipvs *ipvs)
1063{
1064	return ipvs->sysctl_sync_threshold[0];
1065}
1066
1067static inline int sysctl_sync_period(struct netns_ipvs *ipvs)
1068{
1069	return READ_ONCE(ipvs->sysctl_sync_threshold[1]);
1070}
1071
1072static inline unsigned int sysctl_sync_refresh_period(struct netns_ipvs *ipvs)
1073{
1074	return READ_ONCE(ipvs->sysctl_sync_refresh_period);
1075}
1076
1077static inline int sysctl_sync_retries(struct netns_ipvs *ipvs)
1078{
1079	return ipvs->sysctl_sync_retries;
1080}
1081
1082static inline int sysctl_sync_ver(struct netns_ipvs *ipvs)
1083{
1084	return ipvs->sysctl_sync_ver;
1085}
1086
1087static inline int sysctl_sloppy_tcp(struct netns_ipvs *ipvs)
1088{
1089	return ipvs->sysctl_sloppy_tcp;
1090}
1091
1092static inline int sysctl_sloppy_sctp(struct netns_ipvs *ipvs)
1093{
1094	return ipvs->sysctl_sloppy_sctp;
1095}
1096
1097static inline int sysctl_sync_ports(struct netns_ipvs *ipvs)
1098{
1099	return READ_ONCE(ipvs->sysctl_sync_ports);
1100}
1101
1102static inline int sysctl_sync_persist_mode(struct netns_ipvs *ipvs)
1103{
1104	return ipvs->sysctl_sync_persist_mode;
1105}
1106
1107static inline unsigned long sysctl_sync_qlen_max(struct netns_ipvs *ipvs)
1108{
1109	return ipvs->sysctl_sync_qlen_max;
1110}
1111
1112static inline int sysctl_sync_sock_size(struct netns_ipvs *ipvs)
1113{
1114	return ipvs->sysctl_sync_sock_size;
1115}
1116
1117static inline int sysctl_pmtu_disc(struct netns_ipvs *ipvs)
1118{
1119	return ipvs->sysctl_pmtu_disc;
1120}
1121
1122static inline int sysctl_backup_only(struct netns_ipvs *ipvs)
1123{
1124	return ipvs->sync_state & IP_VS_STATE_BACKUP &&
1125	       ipvs->sysctl_backup_only;
1126}
1127
1128static inline int sysctl_conn_reuse_mode(struct netns_ipvs *ipvs)
1129{
1130	return ipvs->sysctl_conn_reuse_mode;
1131}
1132
1133static inline int sysctl_expire_nodest_conn(struct netns_ipvs *ipvs)
1134{
1135	return ipvs->sysctl_expire_nodest_conn;
1136}
1137
1138static inline int sysctl_schedule_icmp(struct netns_ipvs *ipvs)
1139{
1140	return ipvs->sysctl_schedule_icmp;
1141}
1142
1143static inline int sysctl_ignore_tunneled(struct netns_ipvs *ipvs)
1144{
1145	return ipvs->sysctl_ignore_tunneled;
1146}
1147
1148static inline int sysctl_cache_bypass(struct netns_ipvs *ipvs)
1149{
1150	return ipvs->sysctl_cache_bypass;
1151}
1152
1153static inline int sysctl_run_estimation(struct netns_ipvs *ipvs)
1154{
1155	return ipvs->sysctl_run_estimation;
1156}
1157
1158static inline const struct cpumask *sysctl_est_cpulist(struct netns_ipvs *ipvs)
1159{
1160	if (ipvs->est_cpulist_valid)
1161		return ipvs->sysctl_est_cpulist;
1162	else
1163		return housekeeping_cpumask(HK_TYPE_KTHREAD);
1164}
1165
1166static inline int sysctl_est_nice(struct netns_ipvs *ipvs)
1167{
1168	return ipvs->sysctl_est_nice;
1169}
1170
1171#else
1172
1173static inline int sysctl_sync_threshold(struct netns_ipvs *ipvs)
1174{
1175	return DEFAULT_SYNC_THRESHOLD;
1176}
1177
1178static inline int sysctl_sync_period(struct netns_ipvs *ipvs)
1179{
1180	return DEFAULT_SYNC_PERIOD;
1181}
1182
1183static inline unsigned int sysctl_sync_refresh_period(struct netns_ipvs *ipvs)
1184{
1185	return DEFAULT_SYNC_REFRESH_PERIOD;
1186}
1187
1188static inline int sysctl_sync_retries(struct netns_ipvs *ipvs)
1189{
1190	return DEFAULT_SYNC_RETRIES & 3;
1191}
1192
1193static inline int sysctl_sync_ver(struct netns_ipvs *ipvs)
1194{
1195	return DEFAULT_SYNC_VER;
1196}
1197
1198static inline int sysctl_sloppy_tcp(struct netns_ipvs *ipvs)
1199{
1200	return DEFAULT_SLOPPY_TCP;
1201}
1202
1203static inline int sysctl_sloppy_sctp(struct netns_ipvs *ipvs)
1204{
1205	return DEFAULT_SLOPPY_SCTP;
1206}
1207
1208static inline int sysctl_sync_ports(struct netns_ipvs *ipvs)
1209{
1210	return 1;
1211}
1212
1213static inline int sysctl_sync_persist_mode(struct netns_ipvs *ipvs)
1214{
1215	return 0;
1216}
1217
1218static inline unsigned long sysctl_sync_qlen_max(struct netns_ipvs *ipvs)
1219{
1220	return IPVS_SYNC_QLEN_MAX;
1221}
1222
1223static inline int sysctl_sync_sock_size(struct netns_ipvs *ipvs)
1224{
1225	return 0;
1226}
1227
1228static inline int sysctl_pmtu_disc(struct netns_ipvs *ipvs)
1229{
1230	return 1;
1231}
1232
1233static inline int sysctl_backup_only(struct netns_ipvs *ipvs)
1234{
1235	return 0;
1236}
1237
1238static inline int sysctl_conn_reuse_mode(struct netns_ipvs *ipvs)
1239{
1240	return 1;
1241}
1242
1243static inline int sysctl_expire_nodest_conn(struct netns_ipvs *ipvs)
1244{
1245	return 0;
1246}
1247
1248static inline int sysctl_schedule_icmp(struct netns_ipvs *ipvs)
1249{
1250	return 0;
1251}
1252
1253static inline int sysctl_ignore_tunneled(struct netns_ipvs *ipvs)
1254{
1255	return 0;
1256}
1257
1258static inline int sysctl_cache_bypass(struct netns_ipvs *ipvs)
1259{
1260	return 0;
1261}
1262
1263static inline int sysctl_run_estimation(struct netns_ipvs *ipvs)
1264{
1265	return 1;
1266}
1267
1268static inline const struct cpumask *sysctl_est_cpulist(struct netns_ipvs *ipvs)
1269{
1270	return housekeeping_cpumask(HK_TYPE_KTHREAD);
1271}
1272
1273static inline int sysctl_est_nice(struct netns_ipvs *ipvs)
1274{
1275	return IPVS_EST_NICE;
1276}
1277
1278#endif
1279
1280/* IPVS core functions
1281 * (from ip_vs_core.c)
1282 */
1283const char *ip_vs_proto_name(unsigned int proto);
1284void ip_vs_init_hash_table(struct list_head *table, int rows);
1285struct ip_vs_conn *ip_vs_new_conn_out(struct ip_vs_service *svc,
1286				      struct ip_vs_dest *dest,
1287				      struct sk_buff *skb,
1288				      const struct ip_vs_iphdr *iph,
1289				      __be16 dport,
1290				      __be16 cport);
1291#define IP_VS_INIT_HASH_TABLE(t) ip_vs_init_hash_table((t), ARRAY_SIZE((t)))
1292
1293#define IP_VS_APP_TYPE_FTP	1
1294
1295/* ip_vs_conn handling functions
1296 * (from ip_vs_conn.c)
1297 */
1298enum {
1299	IP_VS_DIR_INPUT = 0,
1300	IP_VS_DIR_OUTPUT,
1301	IP_VS_DIR_INPUT_ONLY,
1302	IP_VS_DIR_LAST,
1303};
1304
1305static inline void ip_vs_conn_fill_param(struct netns_ipvs *ipvs, int af, int protocol,
1306					 const union nf_inet_addr *caddr,
1307					 __be16 cport,
1308					 const union nf_inet_addr *vaddr,
1309					 __be16 vport,
1310					 struct ip_vs_conn_param *p)
1311{
1312	p->ipvs = ipvs;
1313	p->af = af;
1314	p->protocol = protocol;
1315	p->caddr = caddr;
1316	p->cport = cport;
1317	p->vaddr = vaddr;
1318	p->vport = vport;
1319	p->pe = NULL;
1320	p->pe_data = NULL;
1321}
1322
1323struct ip_vs_conn *ip_vs_conn_in_get(const struct ip_vs_conn_param *p);
1324struct ip_vs_conn *ip_vs_ct_in_get(const struct ip_vs_conn_param *p);
1325
1326struct ip_vs_conn * ip_vs_conn_in_get_proto(struct netns_ipvs *ipvs, int af,
1327					    const struct sk_buff *skb,
1328					    const struct ip_vs_iphdr *iph);
1329
1330struct ip_vs_conn *ip_vs_conn_out_get(const struct ip_vs_conn_param *p);
1331
1332struct ip_vs_conn * ip_vs_conn_out_get_proto(struct netns_ipvs *ipvs, int af,
1333					     const struct sk_buff *skb,
1334					     const struct ip_vs_iphdr *iph);
1335
1336/* Get reference to gain full access to conn.
1337 * By default, RCU read-side critical sections have access only to
1338 * conn fields and its PE data, see ip_vs_conn_rcu_free() for reference.
1339 */
1340static inline bool __ip_vs_conn_get(struct ip_vs_conn *cp)
1341{
1342	return refcount_inc_not_zero(&cp->refcnt);
1343}
1344
1345/* put back the conn without restarting its timer */
1346static inline void __ip_vs_conn_put(struct ip_vs_conn *cp)
1347{
1348	smp_mb__before_atomic();
1349	refcount_dec(&cp->refcnt);
1350}
1351void ip_vs_conn_put(struct ip_vs_conn *cp);
1352void ip_vs_conn_fill_cport(struct ip_vs_conn *cp, __be16 cport);
1353
1354struct ip_vs_conn *ip_vs_conn_new(const struct ip_vs_conn_param *p, int dest_af,
1355				  const union nf_inet_addr *daddr,
1356				  __be16 dport, unsigned int flags,
1357				  struct ip_vs_dest *dest, __u32 fwmark);
1358void ip_vs_conn_expire_now(struct ip_vs_conn *cp);
1359
1360const char *ip_vs_state_name(const struct ip_vs_conn *cp);
1361
1362void ip_vs_tcp_conn_listen(struct ip_vs_conn *cp);
1363int ip_vs_check_template(struct ip_vs_conn *ct, struct ip_vs_dest *cdest);
1364void ip_vs_random_dropentry(struct netns_ipvs *ipvs);
1365int ip_vs_conn_init(void);
1366void ip_vs_conn_cleanup(void);
1367
1368static inline void ip_vs_control_del(struct ip_vs_conn *cp)
1369{
1370	struct ip_vs_conn *ctl_cp = cp->control;
1371	if (!ctl_cp) {
1372		IP_VS_ERR_BUF("request control DEL for uncontrolled: "
1373			      "%s:%d to %s:%d\n",
1374			      IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1375			      ntohs(cp->cport),
1376			      IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1377			      ntohs(cp->vport));
1378
1379		return;
1380	}
1381
1382	IP_VS_DBG_BUF(7, "DELeting control for: "
1383		      "cp.dst=%s:%d ctl_cp.dst=%s:%d\n",
1384		      IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1385		      ntohs(cp->cport),
1386		      IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr),
1387		      ntohs(ctl_cp->cport));
1388
1389	cp->control = NULL;
1390	if (atomic_read(&ctl_cp->n_control) == 0) {
1391		IP_VS_ERR_BUF("BUG control DEL with n=0 : "
1392			      "%s:%d to %s:%d\n",
1393			      IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1394			      ntohs(cp->cport),
1395			      IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1396			      ntohs(cp->vport));
1397
1398		return;
1399	}
1400	atomic_dec(&ctl_cp->n_control);
1401}
1402
1403static inline void
1404ip_vs_control_add(struct ip_vs_conn *cp, struct ip_vs_conn *ctl_cp)
1405{
1406	if (cp->control) {
1407		IP_VS_ERR_BUF("request control ADD for already controlled: "
1408			      "%s:%d to %s:%d\n",
1409			      IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1410			      ntohs(cp->cport),
1411			      IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1412			      ntohs(cp->vport));
1413
1414		ip_vs_control_del(cp);
1415	}
1416
1417	IP_VS_DBG_BUF(7, "ADDing control for: "
1418		      "cp.dst=%s:%d ctl_cp.dst=%s:%d\n",
1419		      IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1420		      ntohs(cp->cport),
1421		      IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr),
1422		      ntohs(ctl_cp->cport));
1423
1424	cp->control = ctl_cp;
1425	atomic_inc(&ctl_cp->n_control);
1426}
1427
1428/* Mark our template as assured */
1429static inline void
1430ip_vs_control_assure_ct(struct ip_vs_conn *cp)
1431{
1432	struct ip_vs_conn *ct = cp->control;
1433
1434	if (ct && !(ct->state & IP_VS_CTPL_S_ASSURED) &&
1435	    (ct->flags & IP_VS_CONN_F_TEMPLATE))
1436		ct->state |= IP_VS_CTPL_S_ASSURED;
1437}
1438
1439/* IPVS netns init & cleanup functions */
1440int ip_vs_estimator_net_init(struct netns_ipvs *ipvs);
1441int ip_vs_control_net_init(struct netns_ipvs *ipvs);
1442int ip_vs_protocol_net_init(struct netns_ipvs *ipvs);
1443int ip_vs_app_net_init(struct netns_ipvs *ipvs);
1444int ip_vs_conn_net_init(struct netns_ipvs *ipvs);
1445int ip_vs_sync_net_init(struct netns_ipvs *ipvs);
1446void ip_vs_conn_net_cleanup(struct netns_ipvs *ipvs);
1447void ip_vs_app_net_cleanup(struct netns_ipvs *ipvs);
1448void ip_vs_protocol_net_cleanup(struct netns_ipvs *ipvs);
1449void ip_vs_control_net_cleanup(struct netns_ipvs *ipvs);
1450void ip_vs_estimator_net_cleanup(struct netns_ipvs *ipvs);
1451void ip_vs_sync_net_cleanup(struct netns_ipvs *ipvs);
1452void ip_vs_service_nets_cleanup(struct list_head *net_list);
1453
1454/* IPVS application functions
1455 * (from ip_vs_app.c)
1456 */
1457#define IP_VS_APP_MAX_PORTS  8
1458struct ip_vs_app *register_ip_vs_app(struct netns_ipvs *ipvs, struct ip_vs_app *app);
1459void unregister_ip_vs_app(struct netns_ipvs *ipvs, struct ip_vs_app *app);
1460int ip_vs_bind_app(struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1461void ip_vs_unbind_app(struct ip_vs_conn *cp);
1462int register_ip_vs_app_inc(struct netns_ipvs *ipvs, struct ip_vs_app *app, __u16 proto,
1463			   __u16 port);
1464int ip_vs_app_inc_get(struct ip_vs_app *inc);
1465void ip_vs_app_inc_put(struct ip_vs_app *inc);
1466
1467int ip_vs_app_pkt_out(struct ip_vs_conn *, struct sk_buff *skb,
1468		      struct ip_vs_iphdr *ipvsh);
1469int ip_vs_app_pkt_in(struct ip_vs_conn *, struct sk_buff *skb,
1470		     struct ip_vs_iphdr *ipvsh);
1471
1472int register_ip_vs_pe(struct ip_vs_pe *pe);
1473int unregister_ip_vs_pe(struct ip_vs_pe *pe);
1474struct ip_vs_pe *ip_vs_pe_getbyname(const char *name);
1475struct ip_vs_pe *__ip_vs_pe_getbyname(const char *pe_name);
1476
1477/* Use a #define to avoid all of module.h just for these trivial ops */
1478#define ip_vs_pe_get(pe)			\
1479	if (pe && pe->module)			\
1480		__module_get(pe->module);
1481
1482#define ip_vs_pe_put(pe)			\
1483	if (pe && pe->module)			\
1484		module_put(pe->module);
1485
1486/* IPVS protocol functions (from ip_vs_proto.c) */
1487int ip_vs_protocol_init(void);
1488void ip_vs_protocol_cleanup(void);
1489void ip_vs_protocol_timeout_change(struct netns_ipvs *ipvs, int flags);
1490int *ip_vs_create_timeout_table(int *table, int size);
1491void ip_vs_tcpudp_debug_packet(int af, struct ip_vs_protocol *pp,
1492			       const struct sk_buff *skb, int offset,
1493			       const char *msg);
1494
1495extern struct ip_vs_protocol ip_vs_protocol_tcp;
1496extern struct ip_vs_protocol ip_vs_protocol_udp;
1497extern struct ip_vs_protocol ip_vs_protocol_icmp;
1498extern struct ip_vs_protocol ip_vs_protocol_esp;
1499extern struct ip_vs_protocol ip_vs_protocol_ah;
1500extern struct ip_vs_protocol ip_vs_protocol_sctp;
1501
1502/* Registering/unregistering scheduler functions
1503 * (from ip_vs_sched.c)
1504 */
1505int register_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
1506int unregister_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
1507int ip_vs_bind_scheduler(struct ip_vs_service *svc,
1508			 struct ip_vs_scheduler *scheduler);
1509void ip_vs_unbind_scheduler(struct ip_vs_service *svc,
1510			    struct ip_vs_scheduler *sched);
1511struct ip_vs_scheduler *ip_vs_scheduler_get(const char *sched_name);
1512void ip_vs_scheduler_put(struct ip_vs_scheduler *scheduler);
1513struct ip_vs_conn *
1514ip_vs_schedule(struct ip_vs_service *svc, struct sk_buff *skb,
1515	       struct ip_vs_proto_data *pd, int *ignored,
1516	       struct ip_vs_iphdr *iph);
1517int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb,
1518		struct ip_vs_proto_data *pd, struct ip_vs_iphdr *iph);
1519
1520void ip_vs_scheduler_err(struct ip_vs_service *svc, const char *msg);
1521
1522/* IPVS control data and functions (from ip_vs_ctl.c) */
1523extern struct ip_vs_stats ip_vs_stats;
1524extern int sysctl_ip_vs_sync_ver;
1525
1526struct ip_vs_service *
1527ip_vs_service_find(struct netns_ipvs *ipvs, int af, __u32 fwmark, __u16 protocol,
1528		  const union nf_inet_addr *vaddr, __be16 vport);
1529
1530bool ip_vs_has_real_service(struct netns_ipvs *ipvs, int af, __u16 protocol,
1531			    const union nf_inet_addr *daddr, __be16 dport);
1532
1533struct ip_vs_dest *
1534ip_vs_find_real_service(struct netns_ipvs *ipvs, int af, __u16 protocol,
1535			const union nf_inet_addr *daddr, __be16 dport);
1536struct ip_vs_dest *ip_vs_find_tunnel(struct netns_ipvs *ipvs, int af,
1537				     const union nf_inet_addr *daddr,
1538				     __be16 tun_port);
1539
1540int ip_vs_use_count_inc(void);
1541void ip_vs_use_count_dec(void);
1542int ip_vs_register_nl_ioctl(void);
1543void ip_vs_unregister_nl_ioctl(void);
1544int ip_vs_control_init(void);
1545void ip_vs_control_cleanup(void);
1546struct ip_vs_dest *
1547ip_vs_find_dest(struct netns_ipvs *ipvs, int svc_af, int dest_af,
1548		const union nf_inet_addr *daddr, __be16 dport,
1549		const union nf_inet_addr *vaddr, __be16 vport,
1550		__u16 protocol, __u32 fwmark, __u32 flags);
1551void ip_vs_try_bind_dest(struct ip_vs_conn *cp);
1552
1553static inline void ip_vs_dest_hold(struct ip_vs_dest *dest)
1554{
1555	refcount_inc(&dest->refcnt);
1556}
1557
1558static inline void ip_vs_dest_put(struct ip_vs_dest *dest)
1559{
1560	smp_mb__before_atomic();
1561	refcount_dec(&dest->refcnt);
1562}
1563
1564static inline void ip_vs_dest_put_and_free(struct ip_vs_dest *dest)
1565{
1566	if (refcount_dec_and_test(&dest->refcnt))
1567		kfree(dest);
1568}
1569
1570/* IPVS sync daemon data and function prototypes
1571 * (from ip_vs_sync.c)
1572 */
1573int start_sync_thread(struct netns_ipvs *ipvs, struct ipvs_sync_daemon_cfg *cfg,
1574		      int state);
1575int stop_sync_thread(struct netns_ipvs *ipvs, int state);
1576void ip_vs_sync_conn(struct netns_ipvs *ipvs, struct ip_vs_conn *cp, int pkts);
1577
1578/* IPVS rate estimator prototypes (from ip_vs_est.c) */
1579int ip_vs_start_estimator(struct netns_ipvs *ipvs, struct ip_vs_stats *stats);
1580void ip_vs_stop_estimator(struct netns_ipvs *ipvs, struct ip_vs_stats *stats);
1581void ip_vs_zero_estimator(struct ip_vs_stats *stats);
1582void ip_vs_read_estimator(struct ip_vs_kstats *dst, struct ip_vs_stats *stats);
1583void ip_vs_est_reload_start(struct netns_ipvs *ipvs);
1584int ip_vs_est_kthread_start(struct netns_ipvs *ipvs,
1585			    struct ip_vs_est_kt_data *kd);
1586void ip_vs_est_kthread_stop(struct ip_vs_est_kt_data *kd);
1587
1588static inline void ip_vs_est_stopped_recalc(struct netns_ipvs *ipvs)
1589{
1590#ifdef CONFIG_SYSCTL
1591	/* Stop tasks while cpulist is empty or if disabled with flag */
1592	ipvs->est_stopped = !sysctl_run_estimation(ipvs) ||
1593			    (ipvs->est_cpulist_valid &&
1594			     cpumask_empty(sysctl_est_cpulist(ipvs)));
1595#endif
1596}
1597
1598static inline bool ip_vs_est_stopped(struct netns_ipvs *ipvs)
1599{
1600#ifdef CONFIG_SYSCTL
1601	return ipvs->est_stopped;
1602#else
1603	return false;
1604#endif
1605}
1606
1607static inline int ip_vs_est_max_threads(struct netns_ipvs *ipvs)
1608{
1609	unsigned int limit = IPVS_EST_CPU_KTHREADS *
1610			     cpumask_weight(sysctl_est_cpulist(ipvs));
1611
1612	return max(1U, limit);
1613}
1614
1615/* Various IPVS packet transmitters (from ip_vs_xmit.c) */
1616int ip_vs_null_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1617		    struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1618int ip_vs_bypass_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1619		      struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1620int ip_vs_nat_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1621		   struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1622int ip_vs_tunnel_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1623		      struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1624int ip_vs_dr_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1625		  struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1626int ip_vs_icmp_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1627		    struct ip_vs_protocol *pp, int offset,
1628		    unsigned int hooknum, struct ip_vs_iphdr *iph);
1629void ip_vs_dest_dst_rcu_free(struct rcu_head *head);
1630
1631#ifdef CONFIG_IP_VS_IPV6
1632int ip_vs_bypass_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1633			 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1634int ip_vs_nat_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1635		      struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1636int ip_vs_tunnel_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1637			 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1638int ip_vs_dr_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1639		     struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1640int ip_vs_icmp_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1641		       struct ip_vs_protocol *pp, int offset,
1642		       unsigned int hooknum, struct ip_vs_iphdr *iph);
1643#endif
1644
1645#ifdef CONFIG_SYSCTL
1646/* This is a simple mechanism to ignore packets when
1647 * we are loaded. Just set ip_vs_drop_rate to 'n' and
1648 * we start to drop 1/rate of the packets
1649 */
1650static inline int ip_vs_todrop(struct netns_ipvs *ipvs)
1651{
1652	if (!ipvs->drop_rate)
1653		return 0;
1654	if (--ipvs->drop_counter > 0)
1655		return 0;
1656	ipvs->drop_counter = ipvs->drop_rate;
1657	return 1;
1658}
1659#else
1660static inline int ip_vs_todrop(struct netns_ipvs *ipvs) { return 0; }
1661#endif
1662
1663#ifdef CONFIG_SYSCTL
1664/* Enqueue delayed work for expiring no dest connections
1665 * Only run when sysctl_expire_nodest=1
1666 */
1667static inline void ip_vs_enqueue_expire_nodest_conns(struct netns_ipvs *ipvs)
1668{
1669	if (sysctl_expire_nodest_conn(ipvs))
1670		queue_delayed_work(system_long_wq,
1671				   &ipvs->expire_nodest_conn_work, 1);
1672}
1673
1674void ip_vs_expire_nodest_conn_flush(struct netns_ipvs *ipvs);
1675#else
1676static inline void ip_vs_enqueue_expire_nodest_conns(struct netns_ipvs *ipvs) {}
1677#endif
1678
1679#define IP_VS_DFWD_METHOD(dest) (atomic_read(&(dest)->conn_flags) & \
1680				 IP_VS_CONN_F_FWD_MASK)
1681
1682/* ip_vs_fwd_tag returns the forwarding tag of the connection */
1683#define IP_VS_FWD_METHOD(cp)  (cp->flags & IP_VS_CONN_F_FWD_MASK)
1684
1685static inline char ip_vs_fwd_tag(struct ip_vs_conn *cp)
1686{
1687	char fwd;
1688
1689	switch (IP_VS_FWD_METHOD(cp)) {
1690	case IP_VS_CONN_F_MASQ:
1691		fwd = 'M'; break;
1692	case IP_VS_CONN_F_LOCALNODE:
1693		fwd = 'L'; break;
1694	case IP_VS_CONN_F_TUNNEL:
1695		fwd = 'T'; break;
1696	case IP_VS_CONN_F_DROUTE:
1697		fwd = 'R'; break;
1698	case IP_VS_CONN_F_BYPASS:
1699		fwd = 'B'; break;
1700	default:
1701		fwd = '?'; break;
1702	}
1703	return fwd;
1704}
1705
1706void ip_vs_nat_icmp(struct sk_buff *skb, struct ip_vs_protocol *pp,
1707		    struct ip_vs_conn *cp, int dir);
1708
1709#ifdef CONFIG_IP_VS_IPV6
1710void ip_vs_nat_icmp_v6(struct sk_buff *skb, struct ip_vs_protocol *pp,
1711		       struct ip_vs_conn *cp, int dir);
1712#endif
1713
1714__sum16 ip_vs_checksum_complete(struct sk_buff *skb, int offset);
1715
1716static inline __wsum ip_vs_check_diff4(__be32 old, __be32 new, __wsum oldsum)
1717{
1718	__be32 diff[2] = { ~old, new };
1719
1720	return csum_partial(diff, sizeof(diff), oldsum);
1721}
1722
1723#ifdef CONFIG_IP_VS_IPV6
1724static inline __wsum ip_vs_check_diff16(const __be32 *old, const __be32 *new,
1725					__wsum oldsum)
1726{
1727	__be32 diff[8] = { ~old[3], ~old[2], ~old[1], ~old[0],
1728			    new[3],  new[2],  new[1],  new[0] };
1729
1730	return csum_partial(diff, sizeof(diff), oldsum);
1731}
1732#endif
1733
1734static inline __wsum ip_vs_check_diff2(__be16 old, __be16 new, __wsum oldsum)
1735{
1736	__be16 diff[2] = { ~old, new };
1737
1738	return csum_partial(diff, sizeof(diff), oldsum);
1739}
1740
1741/* Forget current conntrack (unconfirmed) and attach notrack entry */
1742static inline void ip_vs_notrack(struct sk_buff *skb)
1743{
1744#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
1745	enum ip_conntrack_info ctinfo;
1746	struct nf_conn *ct = nf_ct_get(skb, &ctinfo);
1747
1748	if (ct) {
1749		nf_conntrack_put(&ct->ct_general);
1750		nf_ct_set(skb, NULL, IP_CT_UNTRACKED);
1751	}
1752#endif
1753}
1754
1755#ifdef CONFIG_IP_VS_NFCT
1756/* Netfilter connection tracking
1757 * (from ip_vs_nfct.c)
1758 */
1759static inline int ip_vs_conntrack_enabled(struct netns_ipvs *ipvs)
1760{
1761#ifdef CONFIG_SYSCTL
1762	return ipvs->sysctl_conntrack;
1763#else
1764	return 0;
1765#endif
1766}
1767
1768void ip_vs_update_conntrack(struct sk_buff *skb, struct ip_vs_conn *cp,
1769			    int outin);
1770int ip_vs_confirm_conntrack(struct sk_buff *skb);
1771void ip_vs_nfct_expect_related(struct sk_buff *skb, struct nf_conn *ct,
1772			       struct ip_vs_conn *cp, u_int8_t proto,
1773			       const __be16 port, int from_rs);
1774void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp);
1775
1776#else
1777
1778static inline int ip_vs_conntrack_enabled(struct netns_ipvs *ipvs)
1779{
1780	return 0;
1781}
1782
1783static inline void ip_vs_update_conntrack(struct sk_buff *skb,
1784					  struct ip_vs_conn *cp, int outin)
1785{
1786}
1787
1788static inline int ip_vs_confirm_conntrack(struct sk_buff *skb)
1789{
1790	return NF_ACCEPT;
1791}
1792
1793static inline void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp)
1794{
1795}
1796#endif /* CONFIG_IP_VS_NFCT */
1797
1798/* Using old conntrack that can not be redirected to another real server? */
1799static inline bool ip_vs_conn_uses_old_conntrack(struct ip_vs_conn *cp,
1800						 struct sk_buff *skb)
1801{
1802#ifdef CONFIG_IP_VS_NFCT
1803	enum ip_conntrack_info ctinfo;
1804	struct nf_conn *ct;
1805
 
 
1806	ct = nf_ct_get(skb, &ctinfo);
1807	if (ct && nf_ct_is_confirmed(ct))
1808		return true;
1809#endif
1810	return false;
1811}
1812
1813static inline int ip_vs_register_conntrack(struct ip_vs_service *svc)
1814{
1815#if IS_ENABLED(CONFIG_NF_CONNTRACK)
1816	int afmask = (svc->af == AF_INET6) ? 2 : 1;
1817	int ret = 0;
1818
1819	if (!(svc->conntrack_afmask & afmask)) {
1820		ret = nf_ct_netns_get(svc->ipvs->net, svc->af);
1821		if (ret >= 0)
1822			svc->conntrack_afmask |= afmask;
1823	}
1824	return ret;
1825#else
1826	return 0;
1827#endif
1828}
1829
1830static inline void ip_vs_unregister_conntrack(struct ip_vs_service *svc)
1831{
1832#if IS_ENABLED(CONFIG_NF_CONNTRACK)
1833	int afmask = (svc->af == AF_INET6) ? 2 : 1;
1834
1835	if (svc->conntrack_afmask & afmask) {
1836		nf_ct_netns_put(svc->ipvs->net, svc->af);
1837		svc->conntrack_afmask &= ~afmask;
1838	}
1839#endif
1840}
1841
1842int ip_vs_register_hooks(struct netns_ipvs *ipvs, unsigned int af);
1843void ip_vs_unregister_hooks(struct netns_ipvs *ipvs, unsigned int af);
1844
1845static inline int
1846ip_vs_dest_conn_overhead(struct ip_vs_dest *dest)
1847{
1848	/* We think the overhead of processing active connections is 256
1849	 * times higher than that of inactive connections in average. (This
1850	 * 256 times might not be accurate, we will change it later) We
1851	 * use the following formula to estimate the overhead now:
1852	 *		  dest->activeconns*256 + dest->inactconns
1853	 */
1854	return (atomic_read(&dest->activeconns) << 8) +
1855		atomic_read(&dest->inactconns);
1856}
1857
1858#ifdef CONFIG_IP_VS_PROTO_TCP
1859INDIRECT_CALLABLE_DECLARE(int
1860	tcp_snat_handler(struct sk_buff *skb, struct ip_vs_protocol *pp,
1861			 struct ip_vs_conn *cp, struct ip_vs_iphdr *iph));
1862#endif
1863
1864#ifdef CONFIG_IP_VS_PROTO_UDP
1865INDIRECT_CALLABLE_DECLARE(int
1866	udp_snat_handler(struct sk_buff *skb, struct ip_vs_protocol *pp,
1867			 struct ip_vs_conn *cp, struct ip_vs_iphdr *iph));
1868#endif
1869#endif	/* _NET_IP_VS_H */