linux/include/net/ip_vs.h
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   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 */
1727