include/net/ip_vs.h

   1 /*
   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 /* old ipvsadm versions still include this file directly */
  12 #ifdef __KERNEL__
  13
  14 #include <asm/types.h>                  /* for __uXX types */
  15
  16 #include <linux/sysctl.h>               /* for ctl_path */
  17 #include <linux/list.h>                 /* for struct list_head */
  18 #include <linux/spinlock.h>             /* for struct rwlock_t */
  19 #include <asm/atomic.h>                 /* for struct atomic_t */
  20 #include <linux/compiler.h>
  21 #include <linux/timer.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>                   /* for ipv6_addr_copy */
  28 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
  29 #include <net/netfilter/nf_conntrack.h>
  30 #endif
  31 #include <net/net_namespace.h>          /* Netw namespace */
  32
  33 /*
  34  * Generic access of ipvs struct
  35  */
  36 static inline struct netns_ipvs *net_ipvs(struct net* net)
  37 {
  38         return net->ipvs;
  39 }
  40 /*
  41  * Get net ptr from skb in traffic cases
  42  * use skb_sknet when call is from userland (ioctl or netlink)
  43  */
  44 static inline struct net *skb_net(struct sk_buff *skb)
  45 {
  46 #ifdef CONFIG_NET_NS
  47 #ifdef CONFIG_IP_VS_DEBUG
  48         /*
  49          * This is used for debug only.
  50          * Start with the most likely hit
  51          * End with BUG
  52          */
  53         if (likely(skb->dev && skb->dev->nd_net))
  54                 return dev_net(skb->dev);
  55         if (skb_dst(skb)->dev)
  56                 return dev_net(skb_dst(skb)->dev);
  57         WARN(skb->sk, "Maybe skb_sknet should be used in %s() at line:%d\n",
  58                       __func__, __LINE__);
  59         if (likely(skb->sk && skb->sk->sk_net))
  60                 return sock_net(skb->sk);
  61         pr_err("There is no net ptr to find in the skb in %s() line:%d\n",
  62                 __func__, __LINE__);
  63         BUG();
  64 #else
  65         return dev_net(skb->dev ? : skb_dst(skb)->dev);
  66 #endif
  67 #else
  68         return &init_net;
  69 #endif
  70 }
  71
  72 static inline struct net *skb_sknet(struct sk_buff *skb)
  73 {
  74 #ifdef CONFIG_NET_NS
  75 #ifdef CONFIG_IP_VS_DEBUG
  76         /* Start with the most likely hit */
  77         if (likely(skb->sk && skb->sk->sk_net))
  78                 return sock_net(skb->sk);
  79         WARN(skb->dev, "Maybe skb_net should be used instead in %s() line:%d\n",
  80                        __func__, __LINE__);
  81         if (likely(skb->dev && skb->dev->nd_net))
  82                 return dev_net(skb->dev);
  83         pr_err("There is no net ptr to find in the skb in %s() line:%d\n",
  84                 __func__, __LINE__);
  85         BUG();
  86 #else
  87         return sock_net(skb->sk);
  88 #endif
  89 #else
  90         return &init_net;
  91 #endif
  92 }
  93
  94 /* Connections' size value needed by ip_vs_ctl.c */
  95 extern int ip_vs_conn_tab_size;
  96
  97
  98 struct ip_vs_iphdr {
  99         int len;
 100         __u8 protocol;
 101         union nf_inet_addr saddr;
 102         union nf_inet_addr daddr;
 103 };
 104
 105 static inline void
 106 ip_vs_fill_iphdr(int af, const void *nh, struct ip_vs_iphdr *iphdr)
 107 {
 108 #ifdef CONFIG_IP_VS_IPV6
 109         if (af == AF_INET6) {
 110                 const struct ipv6hdr *iph = nh;
 111                 iphdr->len = sizeof(struct ipv6hdr);
 112                 iphdr->protocol = iph->nexthdr;
 113                 ipv6_addr_copy(&iphdr->saddr.in6, &iph->saddr);
 114                 ipv6_addr_copy(&iphdr->daddr.in6, &iph->daddr);
 115         } else
 116 #endif
 117         {
 118                 const struct iphdr *iph = nh;
 119                 iphdr->len = iph->ihl * 4;
 120                 iphdr->protocol = iph->protocol;
 121                 iphdr->saddr.ip = iph->saddr;
 122                 iphdr->daddr.ip = iph->daddr;
 123         }
 124 }
 125
 126 static inline void ip_vs_addr_copy(int af, union nf_inet_addr *dst,
 127                                    const union nf_inet_addr *src)
 128 {
 129 #ifdef CONFIG_IP_VS_IPV6
 130         if (af == AF_INET6)
 131                 ipv6_addr_copy(&dst->in6, &src->in6);
 132         else
 133 #endif
 134         dst->ip = src->ip;
 135 }
 136
 137 static inline int ip_vs_addr_equal(int af, const union nf_inet_addr *a,
 138                                    const union nf_inet_addr *b)
 139 {
 140 #ifdef CONFIG_IP_VS_IPV6
 141         if (af == AF_INET6)
 142                 return ipv6_addr_equal(&a->in6, &b->in6);
 143 #endif
 144         return a->ip == b->ip;
 145 }
 146
 147 #ifdef CONFIG_IP_VS_DEBUG
 148 #include <linux/net.h>
 149
 150 extern int ip_vs_get_debug_level(void);
 151
 152 static inline const char *ip_vs_dbg_addr(int af, char *buf, size_t buf_len,
 153                                          const union nf_inet_addr *addr,
 154                                          int *idx)
 155 {
 156         int len;
 157 #ifdef CONFIG_IP_VS_IPV6
 158         if (af == AF_INET6)
 159                 len = snprintf(&buf[*idx], buf_len - *idx, "[%pI6]",
 160                                &addr->in6) + 1;
 161         else
 162 #endif
 163                 len = snprintf(&buf[*idx], buf_len - *idx, "%pI4",
 164                                &addr->ip) + 1;
 165
 166         *idx += len;
 167         BUG_ON(*idx > buf_len + 1);
 168         return &buf[*idx - len];
 169 }
 170
 171 #define IP_VS_DBG_BUF(level, msg, ...)                                  \
 172         do {                                                            \
 173                 char ip_vs_dbg_buf[160];                                \
 174                 int ip_vs_dbg_idx = 0;                                  \
 175                 if (level <= ip_vs_get_debug_level())                   \
 176                         printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__);  \
 177         } while (0)
 178 #define IP_VS_ERR_BUF(msg...)                                           \
 179         do {                                                            \
 180                 char ip_vs_dbg_buf[160];                                \
 181                 int ip_vs_dbg_idx = 0;                                  \
 182                 pr_err(msg);                                            \
 183         } while (0)
 184
 185 /* Only use from within IP_VS_DBG_BUF() or IP_VS_ERR_BUF macros */
 186 #define IP_VS_DBG_ADDR(af, addr)                                        \
 187         ip_vs_dbg_addr(af, ip_vs_dbg_buf,                               \
 188                        sizeof(ip_vs_dbg_buf), addr,                     \
 189                        &ip_vs_dbg_idx)
 190
 191 #define IP_VS_DBG(level, msg, ...)                                      \
 192         do {                                                            \
 193                 if (level <= ip_vs_get_debug_level())                   \
 194                         printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__);  \
 195         } while (0)
 196 #define IP_VS_DBG_RL(msg, ...)                                          \
 197         do {                                                            \
 198                 if (net_ratelimit())                                    \
 199                         printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__);  \
 200         } while (0)
 201 #define IP_VS_DBG_PKT(level, af, pp, skb, ofs, msg)                     \
 202         do {                                                            \
 203                 if (level <= ip_vs_get_debug_level())                   \
 204                         pp->debug_packet(af, pp, skb, ofs, msg);        \
 205         } while (0)
 206 #define IP_VS_DBG_RL_PKT(level, af, pp, skb, ofs, msg)                  \
 207         do {                                                            \
 208                 if (level <= ip_vs_get_debug_level() &&                 \
 209                     net_ratelimit())                                    \
 210                         pp->debug_packet(af, pp, skb, ofs, msg);        \
 211         } while (0)
 212 #else   /* NO DEBUGGING at ALL */
 213 #define IP_VS_DBG_BUF(level, msg...)  do {} while (0)
 214 #define IP_VS_ERR_BUF(msg...)  do {} while (0)
 215 #define IP_VS_DBG(level, msg...)  do {} while (0)
 216 #define IP_VS_DBG_RL(msg...)  do {} while (0)
 217 #define IP_VS_DBG_PKT(level, af, pp, skb, ofs, msg)     do {} while (0)
 218 #define IP_VS_DBG_RL_PKT(level, af, pp, skb, ofs, msg)  do {} while (0)
 219 #endif
 220
 221 #define IP_VS_BUG() BUG()
 222 #define IP_VS_ERR_RL(msg, ...)                                          \
 223         do {                                                            \
 224                 if (net_ratelimit())                                    \
 225                         pr_err(msg, ##__VA_ARGS__);                     \
 226         } while (0)
 227
 228 #ifdef CONFIG_IP_VS_DEBUG
 229 #define EnterFunction(level)                                            \
 230         do {                                                            \
 231                 if (level <= ip_vs_get_debug_level())                   \
 232                         printk(KERN_DEBUG                               \
 233                                pr_fmt("Enter: %s, %s line %i\n"),       \
 234                                __func__, __FILE__, __LINE__);           \
 235         } while (0)
 236 #define LeaveFunction(level)                                            \
 237         do {                                                            \
 238                 if (level <= ip_vs_get_debug_level())                   \
 239                         printk(KERN_DEBUG                               \
 240                                pr_fmt("Leave: %s, %s line %i\n"),       \
 241                                __func__, __FILE__, __LINE__);           \
 242         } while (0)
 243 #else
 244 #define EnterFunction(level)   do {} while (0)
 245 #define LeaveFunction(level)   do {} while (0)
 246 #endif
 247
 248 #define IP_VS_WAIT_WHILE(expr)  while (expr) { cpu_relax(); }
 249
 250
 251 /*
 252  *      The port number of FTP service (in network order).
 253  */
 254 #define FTPPORT  cpu_to_be16(21)
 255 #define FTPDATA  cpu_to_be16(20)
 256
 257 /*
 258  *      TCP State Values
 259  */
 260 enum {
 261         IP_VS_TCP_S_NONE = 0,
 262         IP_VS_TCP_S_ESTABLISHED,
 263         IP_VS_TCP_S_SYN_SENT,
 264         IP_VS_TCP_S_SYN_RECV,
 265         IP_VS_TCP_S_FIN_WAIT,
 266         IP_VS_TCP_S_TIME_WAIT,
 267         IP_VS_TCP_S_CLOSE,
 268         IP_VS_TCP_S_CLOSE_WAIT,
 269         IP_VS_TCP_S_LAST_ACK,
 270         IP_VS_TCP_S_LISTEN,
 271         IP_VS_TCP_S_SYNACK,
 272         IP_VS_TCP_S_LAST
 273 };
 274
 275 /*
 276  *      UDP State Values
 277  */
 278 enum {
 279         IP_VS_UDP_S_NORMAL,
 280         IP_VS_UDP_S_LAST,
 281 };
 282
 283 /*
 284  *      ICMP State Values
 285  */
 286 enum {
 287         IP_VS_ICMP_S_NORMAL,
 288         IP_VS_ICMP_S_LAST,
 289 };
 290
 291 /*
 292  *      SCTP State Values
 293  */
 294 enum ip_vs_sctp_states {
 295         IP_VS_SCTP_S_NONE,
 296         IP_VS_SCTP_S_INIT_CLI,
 297         IP_VS_SCTP_S_INIT_SER,
 298         IP_VS_SCTP_S_INIT_ACK_CLI,
 299         IP_VS_SCTP_S_INIT_ACK_SER,
 300         IP_VS_SCTP_S_ECHO_CLI,
 301         IP_VS_SCTP_S_ECHO_SER,
 302         IP_VS_SCTP_S_ESTABLISHED,
 303         IP_VS_SCTP_S_SHUT_CLI,
 304         IP_VS_SCTP_S_SHUT_SER,
 305         IP_VS_SCTP_S_SHUT_ACK_CLI,
 306         IP_VS_SCTP_S_SHUT_ACK_SER,
 307         IP_VS_SCTP_S_CLOSED,
 308         IP_VS_SCTP_S_LAST
 309 };
 310
 311 /*
 312  *      Delta sequence info structure
 313  *      Each ip_vs_conn has 2 (output AND input seq. changes).
 314  *      Only used in the VS/NAT.
 315  */
 316 struct ip_vs_seq {
 317         __u32                   init_seq;       /* Add delta from this seq */
 318         __u32                   delta;          /* Delta in sequence numbers */
 319         __u32                   previous_delta; /* Delta in sequence numbers
 320                                                    before last resized pkt */
 321 };
 322
 323
 324 /*
 325  *      IPVS statistics objects
 326  */
 327 struct ip_vs_estimator {
 328         struct list_head        list;
 329
 330         u64                     last_inbytes;
 331         u64                     last_outbytes;
 332         u32                     last_conns;
 333         u32                     last_inpkts;
 334         u32                     last_outpkts;
 335
 336         u32                     cps;
 337         u32                     inpps;
 338         u32                     outpps;
 339         u32                     inbps;
 340         u32                     outbps;
 341 };
 342
 343 struct ip_vs_stats {
 344         struct ip_vs_stats_user ustats;         /* statistics */
 345         struct ip_vs_estimator  est;            /* estimator */
 346
 347         spinlock_t              lock;           /* spin lock */
 348 };
 349
 350 struct dst_entry;
 351 struct iphdr;
 352 struct ip_vs_conn;
 353 struct ip_vs_app;
 354 struct sk_buff;
 355 struct ip_vs_proto_data;
 356
 357 struct ip_vs_protocol {
 358         struct ip_vs_protocol   *next;
 359         char                    *name;
 360         u16                     protocol;
 361         u16                     num_states;
 362         int                     dont_defrag;
 363         atomic_t                appcnt;         /* counter of proto app incs */
 364         int                     *timeout_table; /* protocol timeout table */
 365
 366         void (*init)(struct ip_vs_protocol *pp);
 367
 368         void (*exit)(struct ip_vs_protocol *pp);
 369
 370         void (*init_netns)(struct net *net, struct ip_vs_proto_data *pd);
 371
 372         void (*exit_netns)(struct net *net, struct ip_vs_proto_data *pd);
 373
 374         int (*conn_schedule)(int af, struct sk_buff *skb,
 375                              struct ip_vs_proto_data *pd,
 376                              int *verdict, struct ip_vs_conn **cpp);
 377
 378         struct ip_vs_conn *
 379         (*conn_in_get)(int af,
 380                        const struct sk_buff *skb,
 381                        const struct ip_vs_iphdr *iph,
 382                        unsigned int proto_off,
 383                        int inverse);
 384
 385         struct ip_vs_conn *
 386         (*conn_out_get)(int af,
 387                         const struct sk_buff *skb,
 388                         const struct ip_vs_iphdr *iph,
 389                         unsigned int proto_off,
 390                         int inverse);
 391
 392         int (*snat_handler)(struct sk_buff *skb,
 393                             struct ip_vs_protocol *pp, struct ip_vs_conn *cp);
 394
 395         int (*dnat_handler)(struct sk_buff *skb,
 396                             struct ip_vs_protocol *pp, struct ip_vs_conn *cp);
 397
 398         int (*csum_check)(int af, struct sk_buff *skb,
 399                           struct ip_vs_protocol *pp);
 400
 401         const char *(*state_name)(int state);
 402
 403         int (*state_transition)(struct ip_vs_conn *cp, int direction,
 404                                 const struct sk_buff *skb,
 405                                 struct ip_vs_proto_data *pd);
 406
 407         int (*register_app)(struct ip_vs_app *inc);
 408
 409         void (*unregister_app)(struct ip_vs_app *inc);
 410
 411         int (*app_conn_bind)(struct ip_vs_conn *cp);
 412
 413         void (*debug_packet)(int af, struct ip_vs_protocol *pp,
 414                              const struct sk_buff *skb,
 415                              int offset,
 416                              const char *msg);
 417
 418         void (*timeout_change)(struct ip_vs_proto_data *pd, int flags);
 419 };
 420
 421 /*
 422  * protocol data per netns
 423  */
 424 struct ip_vs_proto_data {
 425         struct ip_vs_proto_data *next;
 426         struct ip_vs_protocol   *pp;
 427         int                     *timeout_table; /* protocol timeout table */
 428         atomic_t                appcnt;         /* counter of proto app incs. */
 429         struct tcp_states_t     *tcp_state_table;
 430 };
 431
 432 extern struct ip_vs_protocol   *ip_vs_proto_get(unsigned short proto);
 433 extern struct ip_vs_proto_data *ip_vs_proto_data_get(struct net *net,
 434                                                      unsigned short proto);
 435
 436 struct ip_vs_conn_param {
 437         const union nf_inet_addr        *caddr;
 438         const union nf_inet_addr        *vaddr;
 439         __be16                          cport;
 440         __be16                          vport;
 441         __u16                           protocol;
 442         u16                             af;
 443
 444         const struct ip_vs_pe           *pe;
 445         char                            *pe_data;
 446         __u8                            pe_data_len;
 447 };
 448
 449 /*
 450  *      IP_VS structure allocated for each dynamically scheduled connection
 451  */
 452 struct ip_vs_conn {
 453         struct list_head        c_list;         /* hashed list heads */
 454
 455         /* Protocol, addresses and port numbers */
 456         u16                      af;            /* address family */
 457         union nf_inet_addr       caddr;          /* client address */
 458         union nf_inet_addr       vaddr;          /* virtual address */
 459         union nf_inet_addr       daddr;          /* destination address */
 460         volatile __u32           flags;          /* status flags */
 461         __u32                    fwmark;         /* Fire wall mark from skb */
 462         __be16                   cport;
 463         __be16                   vport;
 464         __be16                   dport;
 465         __u16                   protocol;       /* Which protocol (TCP/UDP) */
 466
 467         /* counter and timer */
 468         atomic_t                refcnt;         /* reference count */
 469         struct timer_list       timer;          /* Expiration timer */
 470         volatile unsigned long  timeout;        /* timeout */
 471
 472         /* Flags and state transition */
 473         spinlock_t              lock;           /* lock for state transition */
 474         volatile __u16          state;          /* state info */
 475         volatile __u16          old_state;      /* old state, to be used for
 476                                                  * state transition triggerd
 477                                                  * synchronization
 478                                                  */
 479
 480         /* Control members */
 481         struct ip_vs_conn       *control;       /* Master control connection */
 482         atomic_t                n_control;      /* Number of controlled ones */
 483         struct ip_vs_dest       *dest;          /* real server */
 484         atomic_t                in_pkts;        /* incoming packet counter */
 485
 486         /* packet transmitter for different forwarding methods.  If it
 487            mangles the packet, it must return NF_DROP or better NF_STOLEN,
 488            otherwise this must be changed to a sk_buff **.
 489            NF_ACCEPT can be returned when destination is local.
 490          */
 491         int (*packet_xmit)(struct sk_buff *skb, struct ip_vs_conn *cp,
 492                            struct ip_vs_protocol *pp);
 493
 494         /* Note: we can group the following members into a structure,
 495            in order to save more space, and the following members are
 496            only used in VS/NAT anyway */
 497         struct ip_vs_app        *app;           /* bound ip_vs_app object */
 498         void                    *app_data;      /* Application private data */
 499         struct ip_vs_seq        in_seq;         /* incoming seq. struct */
 500         struct ip_vs_seq        out_seq;        /* outgoing seq. struct */
 501
 502         const struct ip_vs_pe   *pe;
 503         char                    *pe_data;
 504         __u8                    pe_data_len;
 505 };
 506
 507
 508 /*
 509  *      Extended internal versions of struct ip_vs_service_user and
 510  *      ip_vs_dest_user for IPv6 support.
 511  *
 512  *      We need these to conveniently pass around service and destination
 513  *      options, but unfortunately, we also need to keep the old definitions to
 514  *      maintain userspace backwards compatibility for the setsockopt interface.
 515  */
 516 struct ip_vs_service_user_kern {
 517         /* virtual service addresses */
 518         u16                     af;
 519         u16                     protocol;
 520         union nf_inet_addr      addr;           /* virtual ip address */
 521         u16                     port;
 522         u32                     fwmark;         /* firwall mark of service */
 523
 524         /* virtual service options */
 525         char                    *sched_name;
 526         char                    *pe_name;
 527         unsigned                flags;          /* virtual service flags */
 528         unsigned                timeout;        /* persistent timeout in sec */
 529         u32                     netmask;        /* persistent netmask */
 530 };
 531
 532
 533 struct ip_vs_dest_user_kern {
 534         /* destination server address */
 535         union nf_inet_addr      addr;
 536         u16                     port;
 537
 538         /* real server options */
 539         unsigned                conn_flags;     /* connection flags */
 540         int                     weight;         /* destination weight */
 541
 542         /* thresholds for active connections */
 543         u32                     u_threshold;    /* upper threshold */
 544         u32                     l_threshold;    /* lower threshold */
 545 };
 546
 547
 548 /*
 549  *      The information about the virtual service offered to the net
 550  *      and the forwarding entries
 551  */
 552 struct ip_vs_service {
 553         struct list_head        s_list;   /* for normal service table */
 554         struct list_head        f_list;   /* for fwmark-based service table */
 555         atomic_t                refcnt;   /* reference counter */
 556         atomic_t                usecnt;   /* use counter */
 557
 558         u16                     af;       /* address family */
 559         __u16                   protocol; /* which protocol (TCP/UDP) */
 560         union nf_inet_addr      addr;     /* IP address for virtual service */
 561         __be16                  port;     /* port number for the service */
 562         __u32                   fwmark;   /* firewall mark of the service */
 563         unsigned                flags;    /* service status flags */
 564         unsigned                timeout;  /* persistent timeout in ticks */
 565         __be32                  netmask;  /* grouping granularity */
 566         struct net              *net;
 567
 568         struct list_head        destinations;  /* real server d-linked list */
 569         __u32                   num_dests;     /* number of servers */
 570         struct ip_vs_stats      stats;         /* statistics for the service */
 571         struct ip_vs_app        *inc;     /* bind conns to this app inc */
 572
 573         /* for scheduling */
 574         struct ip_vs_scheduler  *scheduler;    /* bound scheduler object */
 575         rwlock_t                sched_lock;    /* lock sched_data */
 576         void                    *sched_data;   /* scheduler application data */
 577
 578         /* alternate persistence engine */
 579         struct ip_vs_pe         *pe;
 580 };
 581
 582
 583 /*
 584  *      The real server destination forwarding entry
 585  *      with ip address, port number, and so on.
 586  */
 587 struct ip_vs_dest {
 588         struct list_head        n_list;   /* for the dests in the service */
 589         struct list_head        d_list;   /* for table with all the dests */
 590
 591         u16                     af;             /* address family */
 592         union nf_inet_addr      addr;           /* IP address of the server */
 593         __be16                  port;           /* port number of the server */
 594         volatile unsigned       flags;          /* dest status flags */
 595         atomic_t                conn_flags;     /* flags to copy to conn */
 596         atomic_t                weight;         /* server weight */
 597
 598         atomic_t                refcnt;         /* reference counter */
 599         struct ip_vs_stats      stats;          /* statistics */
 600
 601         /* connection counters and thresholds */
 602         atomic_t                activeconns;    /* active connections */
 603         atomic_t                inactconns;     /* inactive connections */
 604         atomic_t                persistconns;   /* persistent connections */
 605         __u32                   u_threshold;    /* upper threshold */
 606         __u32                   l_threshold;    /* lower threshold */
 607
 608         /* for destination cache */
 609         spinlock_t              dst_lock;       /* lock of dst_cache */
 610         struct dst_entry        *dst_cache;     /* destination cache entry */
 611         u32                     dst_rtos;       /* RT_TOS(tos) for dst */
 612         u32                     dst_cookie;
 613 #ifdef CONFIG_IP_VS_IPV6
 614         struct in6_addr         dst_saddr;
 615 #endif
 616
 617         /* for virtual service */
 618         struct ip_vs_service    *svc;           /* service it belongs to */
 619         __u16                   protocol;       /* which protocol (TCP/UDP) */
 620         union nf_inet_addr      vaddr;          /* virtual IP address */
 621         __be16                  vport;          /* virtual port number */
 622         __u32                   vfwmark;        /* firewall mark of service */
 623 };
 624
 625
 626 /*
 627  *      The scheduler object
 628  */
 629 struct ip_vs_scheduler {
 630         struct list_head        n_list;         /* d-linked list head */
 631         char                    *name;          /* scheduler name */
 632         atomic_t                refcnt;         /* reference counter */
 633         struct module           *module;        /* THIS_MODULE/NULL */
 634
 635         /* scheduler initializing service */
 636         int (*init_service)(struct ip_vs_service *svc);
 637         /* scheduling service finish */
 638         int (*done_service)(struct ip_vs_service *svc);
 639         /* scheduler updating service */
 640         int (*update_service)(struct ip_vs_service *svc);
 641
 642         /* selecting a server from the given service */
 643         struct ip_vs_dest* (*schedule)(struct ip_vs_service *svc,
 644                                        const struct sk_buff *skb);
 645 };
 646
 647 /* The persistence engine object */
 648 struct ip_vs_pe {
 649         struct list_head        n_list;         /* d-linked list head */
 650         char                    *name;          /* scheduler name */
 651         atomic_t                refcnt;         /* reference counter */
 652         struct module           *module;        /* THIS_MODULE/NULL */
 653
 654         /* get the connection template, if any */
 655         int (*fill_param)(struct ip_vs_conn_param *p, struct sk_buff *skb);
 656         bool (*ct_match)(const struct ip_vs_conn_param *p,
 657                          struct ip_vs_conn *ct);
 658         u32 (*hashkey_raw)(const struct ip_vs_conn_param *p, u32 initval,
 659                            bool inverse);
 660         int (*show_pe_data)(const struct ip_vs_conn *cp, char *buf);
 661 };
 662
 663 /*
 664  *      The application module object (a.k.a. app incarnation)
 665  */
 666 struct ip_vs_app {
 667         struct list_head        a_list;         /* member in app list */
 668         int                     type;           /* IP_VS_APP_TYPE_xxx */
 669         char                    *name;          /* application module name */
 670         __u16                   protocol;
 671         struct module           *module;        /* THIS_MODULE/NULL */
 672         struct list_head        incs_list;      /* list of incarnations */
 673
 674         /* members for application incarnations */
 675         struct list_head        p_list;         /* member in proto app list */
 676         struct ip_vs_app        *app;           /* its real application */
 677         __be16                  port;           /* port number in net order */
 678         atomic_t                usecnt;         /* usage counter */
 679
 680         /*
 681          * output hook: Process packet in inout direction, diff set for TCP.
 682          * Return: 0=Error, 1=Payload Not Mangled/Mangled but checksum is ok,
 683          *         2=Mangled but checksum was not updated
 684          */
 685         int (*pkt_out)(struct ip_vs_app *, struct ip_vs_conn *,
 686                        struct sk_buff *, int *diff);
 687
 688         /*
 689          * input hook: Process packet in outin direction, diff set for TCP.
 690          * Return: 0=Error, 1=Payload Not Mangled/Mangled but checksum is ok,
 691          *         2=Mangled but checksum was not updated
 692          */
 693         int (*pkt_in)(struct ip_vs_app *, struct ip_vs_conn *,
 694                       struct sk_buff *, int *diff);
 695
 696         /* ip_vs_app initializer */
 697         int (*init_conn)(struct ip_vs_app *, struct ip_vs_conn *);
 698
 699         /* ip_vs_app finish */
 700         int (*done_conn)(struct ip_vs_app *, struct ip_vs_conn *);
 701
 702
 703         /* not used now */
 704         int (*bind_conn)(struct ip_vs_app *, struct ip_vs_conn *,
 705                          struct ip_vs_protocol *);
 706
 707         void (*unbind_conn)(struct ip_vs_app *, struct ip_vs_conn *);
 708
 709         int *                   timeout_table;
 710         int *                   timeouts;
 711         int                     timeouts_size;
 712
 713         int (*conn_schedule)(struct sk_buff *skb, struct ip_vs_app *app,
 714                              int *verdict, struct ip_vs_conn **cpp);
 715
 716         struct ip_vs_conn *
 717         (*conn_in_get)(const struct sk_buff *skb, struct ip_vs_app *app,
 718                        const struct iphdr *iph, unsigned int proto_off,
 719                        int inverse);
 720
 721         struct ip_vs_conn *
 722         (*conn_out_get)(const struct sk_buff *skb, struct ip_vs_app *app,
 723                         const struct iphdr *iph, unsigned int proto_off,
 724                         int inverse);
 725
 726         int (*state_transition)(struct ip_vs_conn *cp, int direction,
 727                                 const struct sk_buff *skb,
 728                                 struct ip_vs_app *app);
 729
 730         void (*timeout_change)(struct ip_vs_app *app, int flags);
 731 };
 732
 733
 734 /*
 735  *      IPVS core functions
 736  *      (from ip_vs_core.c)
 737  */
 738 extern const char *ip_vs_proto_name(unsigned proto);
 739 extern void ip_vs_init_hash_table(struct list_head *table, int rows);
 740 #define IP_VS_INIT_HASH_TABLE(t) ip_vs_init_hash_table((t), ARRAY_SIZE((t)))
 741
 742 #define IP_VS_APP_TYPE_FTP      1
 743
 744 /*
 745  *     ip_vs_conn handling functions
 746  *     (from ip_vs_conn.c)
 747  */
 748
 749 enum {
 750         IP_VS_DIR_INPUT = 0,
 751         IP_VS_DIR_OUTPUT,
 752         IP_VS_DIR_INPUT_ONLY,
 753         IP_VS_DIR_LAST,
 754 };
 755
 756 static inline void ip_vs_conn_fill_param(int af, int protocol,
 757                                          const union nf_inet_addr *caddr,
 758                                          __be16 cport,
 759                                          const union nf_inet_addr *vaddr,
 760                                          __be16 vport,
 761                                          struct ip_vs_conn_param *p)
 762 {
 763         p->af = af;
 764         p->protocol = protocol;
 765         p->caddr = caddr;
 766         p->cport = cport;
 767         p->vaddr = vaddr;
 768         p->vport = vport;
 769         p->pe = NULL;
 770         p->pe_data = NULL;
 771 }
 772
 773 struct ip_vs_conn *ip_vs_conn_in_get(const struct ip_vs_conn_param *p);
 774 struct ip_vs_conn *ip_vs_ct_in_get(const struct ip_vs_conn_param *p);
 775
 776 struct ip_vs_conn * ip_vs_conn_in_get_proto(int af, const struct sk_buff *skb,
 777                                             const struct ip_vs_iphdr *iph,
 778                                             unsigned int proto_off,
 779                                             int inverse);
 780
 781 struct ip_vs_conn *ip_vs_conn_out_get(const struct ip_vs_conn_param *p);
 782
 783 struct ip_vs_conn * ip_vs_conn_out_get_proto(int af, const struct sk_buff *skb,
 784                                              const struct ip_vs_iphdr *iph,
 785                                              unsigned int proto_off,
 786                                              int inverse);
 787
 788 /* put back the conn without restarting its timer */
 789 static inline void __ip_vs_conn_put(struct ip_vs_conn *cp)
 790 {
 791         atomic_dec(&cp->refcnt);
 792 }
 793 extern void ip_vs_conn_put(struct ip_vs_conn *cp);
 794 extern void ip_vs_conn_fill_cport(struct ip_vs_conn *cp, __be16 cport);
 795
 796 struct ip_vs_conn *ip_vs_conn_new(const struct ip_vs_conn_param *p,
 797                                   const union nf_inet_addr *daddr,
 798                                   __be16 dport, unsigned flags,
 799                                   struct ip_vs_dest *dest, __u32 fwmark);
 800 extern void ip_vs_conn_expire_now(struct ip_vs_conn *cp);
 801
 802 extern const char * ip_vs_state_name(__u16 proto, int state);
 803
 804 extern void ip_vs_tcp_conn_listen(struct net *net, struct ip_vs_conn *cp);
 805 extern int ip_vs_check_template(struct ip_vs_conn *ct);
 806 extern void ip_vs_random_dropentry(void);
 807 extern int ip_vs_conn_init(void);
 808 extern void ip_vs_conn_cleanup(void);
 809
 810 static inline void ip_vs_control_del(struct ip_vs_conn *cp)
 811 {
 812         struct ip_vs_conn *ctl_cp = cp->control;
 813         if (!ctl_cp) {
 814                 IP_VS_ERR_BUF("request control DEL for uncontrolled: "
 815                               "%s:%d to %s:%d\n",
 816                               IP_VS_DBG_ADDR(cp->af, &cp->caddr),
 817                               ntohs(cp->cport),
 818                               IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
 819                               ntohs(cp->vport));
 820
 821                 return;
 822         }
 823
 824         IP_VS_DBG_BUF(7, "DELeting control for: "
 825                       "cp.dst=%s:%d ctl_cp.dst=%s:%d\n",
 826                       IP_VS_DBG_ADDR(cp->af, &cp->caddr),
 827                       ntohs(cp->cport),
 828                       IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr),
 829                       ntohs(ctl_cp->cport));
 830
 831         cp->control = NULL;
 832         if (atomic_read(&ctl_cp->n_control) == 0) {
 833                 IP_VS_ERR_BUF("BUG control DEL with n=0 : "
 834                               "%s:%d to %s:%d\n",
 835                               IP_VS_DBG_ADDR(cp->af, &cp->caddr),
 836                               ntohs(cp->cport),
 837                               IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
 838                               ntohs(cp->vport));
 839
 840                 return;
 841         }
 842         atomic_dec(&ctl_cp->n_control);
 843 }
 844
 845 static inline void
 846 ip_vs_control_add(struct ip_vs_conn *cp, struct ip_vs_conn *ctl_cp)
 847 {
 848         if (cp->control) {
 849                 IP_VS_ERR_BUF("request control ADD for already controlled: "
 850                               "%s:%d to %s:%d\n",
 851                               IP_VS_DBG_ADDR(cp->af, &cp->caddr),
 852                               ntohs(cp->cport),
 853                               IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
 854                               ntohs(cp->vport));
 855
 856                 ip_vs_control_del(cp);
 857         }
 858
 859         IP_VS_DBG_BUF(7, "ADDing control for: "
 860                       "cp.dst=%s:%d ctl_cp.dst=%s:%d\n",
 861                       IP_VS_DBG_ADDR(cp->af, &cp->caddr),
 862                       ntohs(cp->cport),
 863                       IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr),
 864                       ntohs(ctl_cp->cport));
 865
 866         cp->control = ctl_cp;
 867         atomic_inc(&ctl_cp->n_control);
 868 }
 869
 870
 871 /*
 872  *      IPVS application functions
 873  *      (from ip_vs_app.c)
 874  */
 875 #define IP_VS_APP_MAX_PORTS  8
 876 extern int register_ip_vs_app(struct ip_vs_app *app);
 877 extern void unregister_ip_vs_app(struct ip_vs_app *app);
 878 extern int ip_vs_bind_app(struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
 879 extern void ip_vs_unbind_app(struct ip_vs_conn *cp);
 880 extern int
 881 register_ip_vs_app_inc(struct ip_vs_app *app, __u16 proto, __u16 port);
 882 extern int ip_vs_app_inc_get(struct ip_vs_app *inc);
 883 extern void ip_vs_app_inc_put(struct ip_vs_app *inc);
 884
 885 extern int ip_vs_app_pkt_out(struct ip_vs_conn *, struct sk_buff *skb);
 886 extern int ip_vs_app_pkt_in(struct ip_vs_conn *, struct sk_buff *skb);
 887 extern int ip_vs_app_init(void);
 888 extern void ip_vs_app_cleanup(void);
 889
 890 void ip_vs_bind_pe(struct ip_vs_service *svc, struct ip_vs_pe *pe);
 891 void ip_vs_unbind_pe(struct ip_vs_service *svc);
 892 int register_ip_vs_pe(struct ip_vs_pe *pe);
 893 int unregister_ip_vs_pe(struct ip_vs_pe *pe);
 894 struct ip_vs_pe *ip_vs_pe_getbyname(const char *name);
 895 struct ip_vs_pe *__ip_vs_pe_getbyname(const char *pe_name);
 896
 897 static inline void ip_vs_pe_get(const struct ip_vs_pe *pe)
 898 {
 899         if (pe && pe->module)
 900                 __module_get(pe->module);
 901 }
 902
 903 static inline void ip_vs_pe_put(const struct ip_vs_pe *pe)
 904 {
 905         if (pe && pe->module)
 906                 module_put(pe->module);
 907 }
 908
 909 /*
 910  *      IPVS protocol functions (from ip_vs_proto.c)
 911  */
 912 extern int ip_vs_protocol_init(void);
 913 extern void ip_vs_protocol_cleanup(void);
 914 extern void ip_vs_protocol_timeout_change(struct netns_ipvs *ipvs, int flags);
 915 extern int *ip_vs_create_timeout_table(int *table, int size);
 916 extern int
 917 ip_vs_set_state_timeout(int *table, int num, const char *const *names,
 918                         const char *name, int to);
 919 extern void
 920 ip_vs_tcpudp_debug_packet(int af, struct ip_vs_protocol *pp,
 921                           const struct sk_buff *skb,
 922                           int offset, const char *msg);
 923
 924 extern struct ip_vs_protocol ip_vs_protocol_tcp;
 925 extern struct ip_vs_protocol ip_vs_protocol_udp;
 926 extern struct ip_vs_protocol ip_vs_protocol_icmp;
 927 extern struct ip_vs_protocol ip_vs_protocol_esp;
 928 extern struct ip_vs_protocol ip_vs_protocol_ah;
 929 extern struct ip_vs_protocol ip_vs_protocol_sctp;
 930
 931 /*
 932  *      Registering/unregistering scheduler functions
 933  *      (from ip_vs_sched.c)
 934  */
 935 extern int register_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
 936 extern int unregister_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
 937 extern int ip_vs_bind_scheduler(struct ip_vs_service *svc,
 938                                 struct ip_vs_scheduler *scheduler);
 939 extern int ip_vs_unbind_scheduler(struct ip_vs_service *svc);
 940 extern struct ip_vs_scheduler *ip_vs_scheduler_get(const char *sched_name);
 941 extern void ip_vs_scheduler_put(struct ip_vs_scheduler *scheduler);
 942 extern struct ip_vs_conn *
 943 ip_vs_schedule(struct ip_vs_service *svc, struct sk_buff *skb,
 944                struct ip_vs_proto_data *pd, int *ignored);
 945 extern int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb,
 946                         struct ip_vs_proto_data *pd);
 947
 948
 949 /*
 950  *      IPVS control data and functions (from ip_vs_ctl.c)
 951  */
 952 extern int sysctl_ip_vs_cache_bypass;
 953 extern int sysctl_ip_vs_expire_nodest_conn;
 954 extern int sysctl_ip_vs_expire_quiescent_template;
 955 extern int sysctl_ip_vs_sync_threshold[2];
 956 extern int sysctl_ip_vs_nat_icmp_send;
 957 extern int sysctl_ip_vs_conntrack;
 958 extern int sysctl_ip_vs_snat_reroute;
 959 extern struct ip_vs_stats ip_vs_stats;
 960 extern const struct ctl_path net_vs_ctl_path[];
 961 extern int sysctl_ip_vs_sync_ver;
 962
 963 extern void ip_vs_sync_switch_mode(int mode);
 964 extern struct ip_vs_service *
 965 ip_vs_service_get(struct net *net, int af, __u32 fwmark, __u16 protocol,
 966                   const union nf_inet_addr *vaddr, __be16 vport);
 967
 968 static inline void ip_vs_service_put(struct ip_vs_service *svc)
 969 {
 970         atomic_dec(&svc->usecnt);
 971 }
 972
 973 extern struct ip_vs_dest *
 974 ip_vs_lookup_real_service(struct net *net, int af, __u16 protocol,
 975                           const union nf_inet_addr *daddr, __be16 dport);
 976
 977 extern int ip_vs_use_count_inc(void);
 978 extern void ip_vs_use_count_dec(void);
 979 extern int ip_vs_control_init(void);
 980 extern void ip_vs_control_cleanup(void);
 981 extern struct ip_vs_dest *
 982 ip_vs_find_dest(struct net *net, int af, const union nf_inet_addr *daddr,
 983                 __be16 dport, const union nf_inet_addr *vaddr, __be16 vport,
 984                 __u16 protocol, __u32 fwmark);
 985 extern struct ip_vs_dest *ip_vs_try_bind_dest(struct ip_vs_conn *cp);
 986
 987
 988 /*
 989  *      IPVS sync daemon data and function prototypes
 990  *      (from ip_vs_sync.c)
 991  */
 992 extern volatile int ip_vs_sync_state;
 993 extern volatile int ip_vs_master_syncid;
 994 extern volatile int ip_vs_backup_syncid;
 995 extern char ip_vs_master_mcast_ifn[IP_VS_IFNAME_MAXLEN];
 996 extern char ip_vs_backup_mcast_ifn[IP_VS_IFNAME_MAXLEN];
 997 extern int start_sync_thread(int state, char *mcast_ifn, __u8 syncid);
 998 extern int stop_sync_thread(int state);
 999 extern void ip_vs_sync_conn(struct ip_vs_conn *cp);
1000 extern int ip_vs_sync_init(void);
1001 extern void ip_vs_sync_cleanup(void);
1002
1003
1004 /*
1005  *      IPVS rate estimator prototypes (from ip_vs_est.c)
1006  */
1007 extern int ip_vs_estimator_init(void);
1008 extern void ip_vs_estimator_cleanup(void);
1009 extern void ip_vs_new_estimator(struct ip_vs_stats *stats);
1010 extern void ip_vs_kill_estimator(struct ip_vs_stats *stats);
1011 extern void ip_vs_zero_estimator(struct ip_vs_stats *stats);
1012
1013 /*
1014  *      Various IPVS packet transmitters (from ip_vs_xmit.c)
1015  */
1016 extern int ip_vs_null_xmit
1017 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1018 extern int ip_vs_bypass_xmit
1019 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1020 extern int ip_vs_nat_xmit
1021 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1022 extern int ip_vs_tunnel_xmit
1023 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1024 extern int ip_vs_dr_xmit
1025 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1026 extern int ip_vs_icmp_xmit
1027 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp, int offset);
1028 extern void ip_vs_dst_reset(struct ip_vs_dest *dest);
1029
1030 #ifdef CONFIG_IP_VS_IPV6
1031 extern int ip_vs_bypass_xmit_v6
1032 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1033 extern int ip_vs_nat_xmit_v6
1034 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1035 extern int ip_vs_tunnel_xmit_v6
1036 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1037 extern int ip_vs_dr_xmit_v6
1038 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1039 extern int ip_vs_icmp_xmit_v6
1040 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp,
1041  int offset);
1042 #endif
1043
1044 /*
1045  *      This is a simple mechanism to ignore packets when
1046  *      we are loaded. Just set ip_vs_drop_rate to 'n' and
1047  *      we start to drop 1/rate of the packets
1048  */
1049 extern int ip_vs_drop_rate;
1050 extern int ip_vs_drop_counter;
1051
1052 static __inline__ int ip_vs_todrop(void)
1053 {
1054         if (!ip_vs_drop_rate) return 0;
1055         if (--ip_vs_drop_counter > 0) return 0;
1056         ip_vs_drop_counter = ip_vs_drop_rate;
1057         return 1;
1058 }
1059
1060 /*
1061  *      ip_vs_fwd_tag returns the forwarding tag of the connection
1062  */
1063 #define IP_VS_FWD_METHOD(cp)  (cp->flags & IP_VS_CONN_F_FWD_MASK)
1064
1065 static inline char ip_vs_fwd_tag(struct ip_vs_conn *cp)
1066 {
1067         char fwd;
1068
1069         switch (IP_VS_FWD_METHOD(cp)) {
1070         case IP_VS_CONN_F_MASQ:
1071                 fwd = 'M'; break;
1072         case IP_VS_CONN_F_LOCALNODE:
1073                 fwd = 'L'; break;
1074         case IP_VS_CONN_F_TUNNEL:
1075                 fwd = 'T'; break;
1076         case IP_VS_CONN_F_DROUTE:
1077                 fwd = 'R'; break;
1078         case IP_VS_CONN_F_BYPASS:
1079                 fwd = 'B'; break;
1080         default:
1081                 fwd = '?'; break;
1082         }
1083         return fwd;
1084 }
1085
1086 extern void ip_vs_nat_icmp(struct sk_buff *skb, struct ip_vs_protocol *pp,
1087                            struct ip_vs_conn *cp, int dir);
1088
1089 #ifdef CONFIG_IP_VS_IPV6
1090 extern void ip_vs_nat_icmp_v6(struct sk_buff *skb, struct ip_vs_protocol *pp,
1091                               struct ip_vs_conn *cp, int dir);
1092 #endif
1093
1094 extern __sum16 ip_vs_checksum_complete(struct sk_buff *skb, int offset);
1095
1096 static inline __wsum ip_vs_check_diff4(__be32 old, __be32 new, __wsum oldsum)
1097 {
1098         __be32 diff[2] = { ~old, new };
1099
1100         return csum_partial(diff, sizeof(diff), oldsum);
1101 }
1102
1103 #ifdef CONFIG_IP_VS_IPV6
1104 static inline __wsum ip_vs_check_diff16(const __be32 *old, const __be32 *new,
1105                                         __wsum oldsum)
1106 {
1107         __be32 diff[8] = { ~old[3], ~old[2], ~old[1], ~old[0],
1108                             new[3],  new[2],  new[1],  new[0] };
1109
1110         return csum_partial(diff, sizeof(diff), oldsum);
1111 }
1112 #endif
1113
1114 static inline __wsum ip_vs_check_diff2(__be16 old, __be16 new, __wsum oldsum)
1115 {
1116         __be16 diff[2] = { ~old, new };
1117
1118         return csum_partial(diff, sizeof(diff), oldsum);
1119 }
1120
1121 /*
1122  * Forget current conntrack (unconfirmed) and attach notrack entry
1123  */
1124 static inline void ip_vs_notrack(struct sk_buff *skb)
1125 {
1126 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
1127         enum ip_conntrack_info ctinfo;
1128         struct nf_conn *ct = ct = nf_ct_get(skb, &ctinfo);
1129
1130         if (!ct || !nf_ct_is_untracked(ct)) {
1131                 nf_reset(skb);
1132                 skb->nfct = &nf_ct_untracked_get()->ct_general;
1133                 skb->nfctinfo = IP_CT_NEW;
1134                 nf_conntrack_get(skb->nfct);
1135         }
1136 #endif
1137 }
1138
1139 #ifdef CONFIG_IP_VS_NFCT
1140 /*
1141  *      Netfilter connection tracking
1142  *      (from ip_vs_nfct.c)
1143  */
1144 static inline int ip_vs_conntrack_enabled(void)
1145 {
1146         return sysctl_ip_vs_conntrack;
1147 }
1148
1149 extern void ip_vs_update_conntrack(struct sk_buff *skb, struct ip_vs_conn *cp,
1150                                    int outin);
1151 extern int ip_vs_confirm_conntrack(struct sk_buff *skb, struct ip_vs_conn *cp);
1152 extern void ip_vs_nfct_expect_related(struct sk_buff *skb, struct nf_conn *ct,
1153                                       struct ip_vs_conn *cp, u_int8_t proto,
1154                                       const __be16 port, int from_rs);
1155 extern void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp);
1156
1157 #else
1158
1159 static inline int ip_vs_conntrack_enabled(void)
1160 {
1161         return 0;
1162 }
1163
1164 static inline void ip_vs_update_conntrack(struct sk_buff *skb,
1165                                           struct ip_vs_conn *cp, int outin)
1166 {
1167 }
1168
1169 static inline int ip_vs_confirm_conntrack(struct sk_buff *skb,
1170                                           struct ip_vs_conn *cp)
1171 {
1172         return NF_ACCEPT;
1173 }
1174
1175 static inline void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp)
1176 {
1177 }
1178 /* CONFIG_IP_VS_NFCT */
1179 #endif
1180
1181 #endif /* __KERNEL__ */
1182
1183 #endif  /* _NET_IP_VS_H */