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 #include <asm/types.h>                  /* for __uXX types */
  12
  13 #include <linux/sysctl.h>               /* for ctl_path */
  14 #include <linux/list.h>                 /* for struct list_head */
  15 #include <linux/spinlock.h>             /* for struct rwlock_t */
  16 #include <linux/atomic.h>                 /* for struct atomic_t */
  17 #include <linux/compiler.h>
  18 #include <linux/timer.h>
  19
  20 #include <net/checksum.h>
  21 #include <linux/netfilter.h>            /* for union nf_inet_addr */
  22 #include <linux/ip.h>
  23 #include <linux/ipv6.h>                 /* for struct ipv6hdr */
  24 #include <net/ipv6.h>                   /* for ipv6_addr_copy */
  25 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
  26 #include <net/netfilter/nf_conntrack.h>
  27 #endif
  28 #include <net/net_namespace.h>          /* Netw namespace */
  29
  30 /*
  31  * Generic access of ipvs struct
  32  */
  33 static inline struct netns_ipvs *net_ipvs(struct net* net)
  34 {
  35         return net->ipvs;
  36 }
  37 /*
  38  * Get net ptr from skb in traffic cases
  39  * use skb_sknet when call is from userland (ioctl or netlink)
  40  */
  41 static inline struct net *skb_net(const struct sk_buff *skb)
  42 {
  43 #ifdef CONFIG_NET_NS
  44 #ifdef CONFIG_IP_VS_DEBUG
  45         /*
  46          * This is used for debug only.
  47          * Start with the most likely hit
  48          * End with BUG
  49          */
  50         if (likely(skb->dev && skb->dev->nd_net))
  51                 return dev_net(skb->dev);
  52         if (skb_dst(skb) && skb_dst(skb)->dev)
  53                 return dev_net(skb_dst(skb)->dev);
  54         WARN(skb->sk, "Maybe skb_sknet should be used in %s() at line:%d\n",
  55                       __func__, __LINE__);
  56         if (likely(skb->sk && skb->sk->sk_net))
  57                 return sock_net(skb->sk);
  58         pr_err("There is no net ptr to find in the skb in %s() line:%d\n",
  59                 __func__, __LINE__);
  60         BUG();
  61 #else
  62         return dev_net(skb->dev ? : skb_dst(skb)->dev);
  63 #endif
  64 #else
  65         return &init_net;
  66 #endif
  67 }
  68
  69 static inline struct net *skb_sknet(const struct sk_buff *skb)
  70 {
  71 #ifdef CONFIG_NET_NS
  72 #ifdef CONFIG_IP_VS_DEBUG
  73         /* Start with the most likely hit */
  74         if (likely(skb->sk && skb->sk->sk_net))
  75                 return sock_net(skb->sk);
  76         WARN(skb->dev, "Maybe skb_net should be used instead in %s() line:%d\n",
  77                        __func__, __LINE__);
  78         if (likely(skb->dev && skb->dev->nd_net))
  79                 return dev_net(skb->dev);
  80         pr_err("There is no net ptr to find in the skb in %s() line:%d\n",
  81                 __func__, __LINE__);
  82         BUG();
  83 #else
  84         return sock_net(skb->sk);
  85 #endif
  86 #else
  87         return &init_net;
  88 #endif
  89 }
  90 /*
  91  * This one needed for single_open_net since net is stored directly in
  92  * private not as a struct i.e. seq_file_net can't be used.
  93  */
  94 static inline struct net *seq_file_single_net(struct seq_file *seq)
  95 {
  96 #ifdef CONFIG_NET_NS
  97         return (struct net *)seq->private;
  98 #else
  99         return &init_net;
 100 #endif
 101 }
 102
 103 /* Connections' size value needed by ip_vs_ctl.c */
 104 extern int ip_vs_conn_tab_size;
 105
 106
 107 struct ip_vs_iphdr {
 108         int len;
 109         __u8 protocol;
 110         union nf_inet_addr saddr;
 111         union nf_inet_addr daddr;
 112 };
 113
 114 static inline void
 115 ip_vs_fill_iphdr(int af, const void *nh, struct ip_vs_iphdr *iphdr)
 116 {
 117 #ifdef CONFIG_IP_VS_IPV6
 118         if (af == AF_INET6) {
 119                 const struct ipv6hdr *iph = nh;
 120                 iphdr->len = sizeof(struct ipv6hdr);
 121                 iphdr->protocol = iph->nexthdr;
 122                 ipv6_addr_copy(&iphdr->saddr.in6, &iph->saddr);
 123                 ipv6_addr_copy(&iphdr->daddr.in6, &iph->daddr);
 124         } else
 125 #endif
 126         {
 127                 const struct iphdr *iph = nh;
 128                 iphdr->len = iph->ihl * 4;
 129                 iphdr->protocol = iph->protocol;
 130                 iphdr->saddr.ip = iph->saddr;
 131                 iphdr->daddr.ip = iph->daddr;
 132         }
 133 }
 134
 135 static inline void ip_vs_addr_copy(int af, union nf_inet_addr *dst,
 136                                    const union nf_inet_addr *src)
 137 {
 138 #ifdef CONFIG_IP_VS_IPV6
 139         if (af == AF_INET6)
 140                 ipv6_addr_copy(&dst->in6, &src->in6);
 141         else
 142 #endif
 143         dst->ip = src->ip;
 144 }
 145
 146 static inline int ip_vs_addr_equal(int af, const union nf_inet_addr *a,
 147                                    const union nf_inet_addr *b)
 148 {
 149 #ifdef CONFIG_IP_VS_IPV6
 150         if (af == AF_INET6)
 151                 return ipv6_addr_equal(&a->in6, &b->in6);
 152 #endif
 153         return a->ip == b->ip;
 154 }
 155
 156 #ifdef CONFIG_IP_VS_DEBUG
 157 #include <linux/net.h>
 158
 159 extern int ip_vs_get_debug_level(void);
 160
 161 static inline const char *ip_vs_dbg_addr(int af, char *buf, size_t buf_len,
 162                                          const union nf_inet_addr *addr,
 163                                          int *idx)
 164 {
 165         int len;
 166 #ifdef CONFIG_IP_VS_IPV6
 167         if (af == AF_INET6)
 168                 len = snprintf(&buf[*idx], buf_len - *idx, "[%pI6]",
 169                                &addr->in6) + 1;
 170         else
 171 #endif
 172                 len = snprintf(&buf[*idx], buf_len - *idx, "%pI4",
 173                                &addr->ip) + 1;
 174
 175         *idx += len;
 176         BUG_ON(*idx > buf_len + 1);
 177         return &buf[*idx - len];
 178 }
 179
 180 #define IP_VS_DBG_BUF(level, msg, ...)                                  \
 181         do {                                                            \
 182                 char ip_vs_dbg_buf[160];                                \
 183                 int ip_vs_dbg_idx = 0;                                  \
 184                 if (level <= ip_vs_get_debug_level())                   \
 185                         printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__);  \
 186         } while (0)
 187 #define IP_VS_ERR_BUF(msg...)                                           \
 188         do {                                                            \
 189                 char ip_vs_dbg_buf[160];                                \
 190                 int ip_vs_dbg_idx = 0;                                  \
 191                 pr_err(msg);                                            \
 192         } while (0)
 193
 194 /* Only use from within IP_VS_DBG_BUF() or IP_VS_ERR_BUF macros */
 195 #define IP_VS_DBG_ADDR(af, addr)                                        \
 196         ip_vs_dbg_addr(af, ip_vs_dbg_buf,                               \
 197                        sizeof(ip_vs_dbg_buf), addr,                     \
 198                        &ip_vs_dbg_idx)
 199
 200 #define IP_VS_DBG(level, msg, ...)                                      \
 201         do {                                                            \
 202                 if (level <= ip_vs_get_debug_level())                   \
 203                         printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__);  \
 204         } while (0)
 205 #define IP_VS_DBG_RL(msg, ...)                                          \
 206         do {                                                            \
 207                 if (net_ratelimit())                                    \
 208                         printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__);  \
 209         } while (0)
 210 #define IP_VS_DBG_PKT(level, af, pp, skb, ofs, msg)                     \
 211         do {                                                            \
 212                 if (level <= ip_vs_get_debug_level())                   \
 213                         pp->debug_packet(af, pp, skb, ofs, msg);        \
 214         } while (0)
 215 #define IP_VS_DBG_RL_PKT(level, af, pp, skb, ofs, msg)                  \
 216         do {                                                            \
 217                 if (level <= ip_vs_get_debug_level() &&                 \
 218                     net_ratelimit())                                    \
 219                         pp->debug_packet(af, pp, skb, ofs, msg);        \
 220         } while (0)
 221 #else   /* NO DEBUGGING at ALL */
 222 #define IP_VS_DBG_BUF(level, msg...)  do {} while (0)
 223 #define IP_VS_ERR_BUF(msg...)  do {} while (0)
 224 #define IP_VS_DBG(level, msg...)  do {} while (0)
 225 #define IP_VS_DBG_RL(msg...)  do {} while (0)
 226 #define IP_VS_DBG_PKT(level, af, pp, skb, ofs, msg)     do {} while (0)
 227 #define IP_VS_DBG_RL_PKT(level, af, pp, skb, ofs, msg)  do {} while (0)
 228 #endif
 229
 230 #define IP_VS_BUG() BUG()
 231 #define IP_VS_ERR_RL(msg, ...)                                          \
 232         do {                                                            \
 233                 if (net_ratelimit())                                    \
 234                         pr_err(msg, ##__VA_ARGS__);                     \
 235         } while (0)
 236
 237 #ifdef CONFIG_IP_VS_DEBUG
 238 #define EnterFunction(level)                                            \
 239         do {                                                            \
 240                 if (level <= ip_vs_get_debug_level())                   \
 241                         printk(KERN_DEBUG                               \
 242                                pr_fmt("Enter: %s, %s line %i\n"),       \
 243                                __func__, __FILE__, __LINE__);           \
 244         } while (0)
 245 #define LeaveFunction(level)                                            \
 246         do {                                                            \
 247                 if (level <= ip_vs_get_debug_level())                   \
 248                         printk(KERN_DEBUG                               \
 249                                pr_fmt("Leave: %s, %s line %i\n"),       \
 250                                __func__, __FILE__, __LINE__);           \
 251         } while (0)
 252 #else
 253 #define EnterFunction(level)   do {} while (0)
 254 #define LeaveFunction(level)   do {} while (0)
 255 #endif
 256
 257 #define IP_VS_WAIT_WHILE(expr)  while (expr) { cpu_relax(); }
 258
 259
 260 /*
 261  *      The port number of FTP service (in network order).
 262  */
 263 #define FTPPORT  cpu_to_be16(21)
 264 #define FTPDATA  cpu_to_be16(20)
 265
 266 /*
 267  *      TCP State Values
 268  */
 269 enum {
 270         IP_VS_TCP_S_NONE = 0,
 271         IP_VS_TCP_S_ESTABLISHED,
 272         IP_VS_TCP_S_SYN_SENT,
 273         IP_VS_TCP_S_SYN_RECV,
 274         IP_VS_TCP_S_FIN_WAIT,
 275         IP_VS_TCP_S_TIME_WAIT,
 276         IP_VS_TCP_S_CLOSE,
 277         IP_VS_TCP_S_CLOSE_WAIT,
 278         IP_VS_TCP_S_LAST_ACK,
 279         IP_VS_TCP_S_LISTEN,
 280         IP_VS_TCP_S_SYNACK,
 281         IP_VS_TCP_S_LAST
 282 };
 283
 284 /*
 285  *      UDP State Values
 286  */
 287 enum {
 288         IP_VS_UDP_S_NORMAL,
 289         IP_VS_UDP_S_LAST,
 290 };
 291
 292 /*
 293  *      ICMP State Values
 294  */
 295 enum {
 296         IP_VS_ICMP_S_NORMAL,
 297         IP_VS_ICMP_S_LAST,
 298 };
 299
 300 /*
 301  *      SCTP State Values
 302  */
 303 enum ip_vs_sctp_states {
 304         IP_VS_SCTP_S_NONE,
 305         IP_VS_SCTP_S_INIT_CLI,
 306         IP_VS_SCTP_S_INIT_SER,
 307         IP_VS_SCTP_S_INIT_ACK_CLI,
 308         IP_VS_SCTP_S_INIT_ACK_SER,
 309         IP_VS_SCTP_S_ECHO_CLI,
 310         IP_VS_SCTP_S_ECHO_SER,
 311         IP_VS_SCTP_S_ESTABLISHED,
 312         IP_VS_SCTP_S_SHUT_CLI,
 313         IP_VS_SCTP_S_SHUT_SER,
 314         IP_VS_SCTP_S_SHUT_ACK_CLI,
 315         IP_VS_SCTP_S_SHUT_ACK_SER,
 316         IP_VS_SCTP_S_CLOSED,
 317         IP_VS_SCTP_S_LAST
 318 };
 319
 320 /*
 321  *      Delta sequence info structure
 322  *      Each ip_vs_conn has 2 (output AND input seq. changes).
 323  *      Only used in the VS/NAT.
 324  */
 325 struct ip_vs_seq {
 326         __u32                   init_seq;       /* Add delta from this seq */
 327         __u32                   delta;          /* Delta in sequence numbers */
 328         __u32                   previous_delta; /* Delta in sequence numbers
 329                                                    before last resized pkt */
 330 };
 331
 332 /*
 333  * counters per cpu
 334  */
 335 struct ip_vs_counters {
 336         __u32           conns;          /* connections scheduled */
 337         __u32           inpkts;         /* incoming packets */
 338         __u32           outpkts;        /* outgoing packets */
 339         __u64           inbytes;        /* incoming bytes */
 340         __u64           outbytes;       /* outgoing bytes */
 341 };
 342 /*
 343  * Stats per cpu
 344  */
 345 struct ip_vs_cpu_stats {
 346         struct ip_vs_counters   ustats;
 347         struct u64_stats_sync   syncp;
 348 };
 349
 350 /*
 351  *      IPVS statistics objects
 352  */
 353 struct ip_vs_estimator {
 354         struct list_head        list;
 355
 356         u64                     last_inbytes;
 357         u64                     last_outbytes;
 358         u32                     last_conns;
 359         u32                     last_inpkts;
 360         u32                     last_outpkts;
 361
 362         u32                     cps;
 363         u32                     inpps;
 364         u32                     outpps;
 365         u32                     inbps;
 366         u32                     outbps;
 367 };
 368
 369 struct ip_vs_stats {
 370         struct ip_vs_stats_user ustats;         /* statistics */
 371         struct ip_vs_estimator  est;            /* estimator */
 372         struct ip_vs_cpu_stats  *cpustats;      /* per cpu counters */
 373         spinlock_t              lock;           /* spin lock */
 374         struct ip_vs_stats_user ustats0;        /* reset values */
 375 };
 376
 377 struct dst_entry;
 378 struct iphdr;
 379 struct ip_vs_conn;
 380 struct ip_vs_app;
 381 struct sk_buff;
 382 struct ip_vs_proto_data;
 383
 384 struct ip_vs_protocol {
 385         struct ip_vs_protocol   *next;
 386         char                    *name;
 387         u16                     protocol;
 388         u16                     num_states;
 389         int                     dont_defrag;
 390
 391         void (*init)(struct ip_vs_protocol *pp);
 392
 393         void (*exit)(struct ip_vs_protocol *pp);
 394
 395         void (*init_netns)(struct net *net, struct ip_vs_proto_data *pd);
 396
 397         void (*exit_netns)(struct net *net, struct ip_vs_proto_data *pd);
 398
 399         int (*conn_schedule)(int af, struct sk_buff *skb,
 400                              struct ip_vs_proto_data *pd,
 401                              int *verdict, struct ip_vs_conn **cpp);
 402
 403         struct ip_vs_conn *
 404         (*conn_in_get)(int af,
 405                        const struct sk_buff *skb,
 406                        const struct ip_vs_iphdr *iph,
 407                        unsigned int proto_off,
 408                        int inverse);
 409
 410         struct ip_vs_conn *
 411         (*conn_out_get)(int af,
 412                         const struct sk_buff *skb,
 413                         const struct ip_vs_iphdr *iph,
 414                         unsigned int proto_off,
 415                         int inverse);
 416
 417         int (*snat_handler)(struct sk_buff *skb,
 418                             struct ip_vs_protocol *pp, struct ip_vs_conn *cp);
 419
 420         int (*dnat_handler)(struct sk_buff *skb,
 421                             struct ip_vs_protocol *pp, struct ip_vs_conn *cp);
 422
 423         int (*csum_check)(int af, struct sk_buff *skb,
 424                           struct ip_vs_protocol *pp);
 425
 426         const char *(*state_name)(int state);
 427
 428         void (*state_transition)(struct ip_vs_conn *cp, int direction,
 429                                  const struct sk_buff *skb,
 430                                  struct ip_vs_proto_data *pd);
 431
 432         int (*register_app)(struct net *net, struct ip_vs_app *inc);
 433
 434         void (*unregister_app)(struct net *net, struct ip_vs_app *inc);
 435
 436         int (*app_conn_bind)(struct ip_vs_conn *cp);
 437
 438         void (*debug_packet)(int af, struct ip_vs_protocol *pp,
 439                              const struct sk_buff *skb,
 440                              int offset,
 441                              const char *msg);
 442
 443         void (*timeout_change)(struct ip_vs_proto_data *pd, int flags);
 444 };
 445
 446 /*
 447  * protocol data per netns
 448  */
 449 struct ip_vs_proto_data {
 450         struct ip_vs_proto_data *next;
 451         struct ip_vs_protocol   *pp;
 452         int                     *timeout_table; /* protocol timeout table */
 453         atomic_t                appcnt;         /* counter of proto app incs. */
 454         struct tcp_states_t     *tcp_state_table;
 455 };
 456
 457 extern struct ip_vs_protocol   *ip_vs_proto_get(unsigned short proto);
 458 extern struct ip_vs_proto_data *ip_vs_proto_data_get(struct net *net,
 459                                                      unsigned short proto);
 460
 461 struct ip_vs_conn_param {
 462         struct net                      *net;
 463         const union nf_inet_addr        *caddr;
 464         const union nf_inet_addr        *vaddr;
 465         __be16                          cport;
 466         __be16                          vport;
 467         __u16                           protocol;
 468         u16                             af;
 469
 470         const struct ip_vs_pe           *pe;
 471         char                            *pe_data;
 472         __u8                            pe_data_len;
 473 };
 474
 475 /*
 476  *      IP_VS structure allocated for each dynamically scheduled connection
 477  */
 478 struct ip_vs_conn {
 479         struct hlist_node       c_list;         /* hashed list heads */
 480 #ifdef CONFIG_NET_NS
 481         struct net              *net;           /* Name space */
 482 #endif
 483         /* Protocol, addresses and port numbers */
 484         u16                     af;             /* address family */
 485         __be16                  cport;
 486         __be16                  vport;
 487         __be16                  dport;
 488         __u32                   fwmark;         /* Fire wall mark from skb */
 489         union nf_inet_addr      caddr;          /* client address */
 490         union nf_inet_addr      vaddr;          /* virtual address */
 491         union nf_inet_addr      daddr;          /* destination address */
 492         volatile __u32          flags;          /* status flags */
 493         __u16                   protocol;       /* Which protocol (TCP/UDP) */
 494
 495         /* counter and timer */
 496         atomic_t                refcnt;         /* reference count */
 497         struct timer_list       timer;          /* Expiration timer */
 498         volatile unsigned long  timeout;        /* timeout */
 499
 500         /* Flags and state transition */
 501         spinlock_t              lock;           /* lock for state transition */
 502         volatile __u16          state;          /* state info */
 503         volatile __u16          old_state;      /* old state, to be used for
 504                                                  * state transition triggerd
 505                                                  * synchronization
 506                                                  */
 507
 508         /* Control members */
 509         struct ip_vs_conn       *control;       /* Master control connection */
 510         atomic_t                n_control;      /* Number of controlled ones */
 511         struct ip_vs_dest       *dest;          /* real server */
 512         atomic_t                in_pkts;        /* incoming packet counter */
 513
 514         /* packet transmitter for different forwarding methods.  If it
 515            mangles the packet, it must return NF_DROP or better NF_STOLEN,
 516            otherwise this must be changed to a sk_buff **.
 517            NF_ACCEPT can be returned when destination is local.
 518          */
 519         int (*packet_xmit)(struct sk_buff *skb, struct ip_vs_conn *cp,
 520                            struct ip_vs_protocol *pp);
 521
 522         /* Note: we can group the following members into a structure,
 523            in order to save more space, and the following members are
 524            only used in VS/NAT anyway */
 525         struct ip_vs_app        *app;           /* bound ip_vs_app object */
 526         void                    *app_data;      /* Application private data */
 527         struct ip_vs_seq        in_seq;         /* incoming seq. struct */
 528         struct ip_vs_seq        out_seq;        /* outgoing seq. struct */
 529
 530         const struct ip_vs_pe   *pe;
 531         char                    *pe_data;
 532         __u8                    pe_data_len;
 533 };
 534
 535 /*
 536  *  To save some memory in conn table when name space is disabled.
 537  */
 538 static inline struct net *ip_vs_conn_net(const struct ip_vs_conn *cp)
 539 {
 540 #ifdef CONFIG_NET_NS
 541         return cp->net;
 542 #else
 543         return &init_net;
 544 #endif
 545 }
 546 static inline void ip_vs_conn_net_set(struct ip_vs_conn *cp, struct net *net)
 547 {
 548 #ifdef CONFIG_NET_NS
 549         cp->net = net;
 550 #endif
 551 }
 552
 553 static inline int ip_vs_conn_net_eq(const struct ip_vs_conn *cp,
 554                                     struct net *net)
 555 {
 556 #ifdef CONFIG_NET_NS
 557         return cp->net == net;
 558 #else
 559         return 1;
 560 #endif
 561 }
 562
 563 /*
 564  *      Extended internal versions of struct ip_vs_service_user and
 565  *      ip_vs_dest_user for IPv6 support.
 566  *
 567  *      We need these to conveniently pass around service and destination
 568  *      options, but unfortunately, we also need to keep the old definitions to
 569  *      maintain userspace backwards compatibility for the setsockopt interface.
 570  */
 571 struct ip_vs_service_user_kern {
 572         /* virtual service addresses */
 573         u16                     af;
 574         u16                     protocol;
 575         union nf_inet_addr      addr;           /* virtual ip address */
 576         u16                     port;
 577         u32                     fwmark;         /* firwall mark of service */
 578
 579         /* virtual service options */
 580         char                    *sched_name;
 581         char                    *pe_name;
 582         unsigned                flags;          /* virtual service flags */
 583         unsigned                timeout;        /* persistent timeout in sec */
 584         u32                     netmask;        /* persistent netmask */
 585 };
 586
 587
 588 struct ip_vs_dest_user_kern {
 589         /* destination server address */
 590         union nf_inet_addr      addr;
 591         u16                     port;
 592
 593         /* real server options */
 594         unsigned                conn_flags;     /* connection flags */
 595         int                     weight;         /* destination weight */
 596
 597         /* thresholds for active connections */
 598         u32                     u_threshold;    /* upper threshold */
 599         u32                     l_threshold;    /* lower threshold */
 600 };
 601
 602
 603 /*
 604  *      The information about the virtual service offered to the net
 605  *      and the forwarding entries
 606  */
 607 struct ip_vs_service {
 608         struct list_head        s_list;   /* for normal service table */
 609         struct list_head        f_list;   /* for fwmark-based service table */
 610         atomic_t                refcnt;   /* reference counter */
 611         atomic_t                usecnt;   /* use counter */
 612
 613         u16                     af;       /* address family */
 614         __u16                   protocol; /* which protocol (TCP/UDP) */
 615         union nf_inet_addr      addr;     /* IP address for virtual service */
 616         __be16                  port;     /* port number for the service */
 617         __u32                   fwmark;   /* firewall mark of the service */
 618         unsigned                flags;    /* service status flags */
 619         unsigned                timeout;  /* persistent timeout in ticks */
 620         __be32                  netmask;  /* grouping granularity */
 621         struct net              *net;
 622
 623         struct list_head        destinations;  /* real server d-linked list */
 624         __u32                   num_dests;     /* number of servers */
 625         struct ip_vs_stats      stats;         /* statistics for the service */
 626         struct ip_vs_app        *inc;     /* bind conns to this app inc */
 627
 628         /* for scheduling */
 629         struct ip_vs_scheduler  *scheduler;    /* bound scheduler object */
 630         rwlock_t                sched_lock;    /* lock sched_data */
 631         void                    *sched_data;   /* scheduler application data */
 632
 633         /* alternate persistence engine */
 634         struct ip_vs_pe         *pe;
 635 };
 636
 637
 638 /*
 639  *      The real server destination forwarding entry
 640  *      with ip address, port number, and so on.
 641  */
 642 struct ip_vs_dest {
 643         struct list_head        n_list;   /* for the dests in the service */
 644         struct list_head        d_list;   /* for table with all the dests */
 645
 646         u16                     af;             /* address family */
 647         __be16                  port;           /* port number of the server */
 648         union nf_inet_addr      addr;           /* IP address of the server */
 649         volatile unsigned       flags;          /* dest status flags */
 650         atomic_t                conn_flags;     /* flags to copy to conn */
 651         atomic_t                weight;         /* server weight */
 652
 653         atomic_t                refcnt;         /* reference counter */
 654         struct ip_vs_stats      stats;          /* statistics */
 655
 656         /* connection counters and thresholds */
 657         atomic_t                activeconns;    /* active connections */
 658         atomic_t                inactconns;     /* inactive connections */
 659         atomic_t                persistconns;   /* persistent connections */
 660         __u32                   u_threshold;    /* upper threshold */
 661         __u32                   l_threshold;    /* lower threshold */
 662
 663         /* for destination cache */
 664         spinlock_t              dst_lock;       /* lock of dst_cache */
 665         struct dst_entry        *dst_cache;     /* destination cache entry */
 666         u32                     dst_rtos;       /* RT_TOS(tos) for dst */
 667         u32                     dst_cookie;
 668         union nf_inet_addr      dst_saddr;
 669
 670         /* for virtual service */
 671         struct ip_vs_service    *svc;           /* service it belongs to */
 672         __u16                   protocol;       /* which protocol (TCP/UDP) */
 673         __be16                  vport;          /* virtual port number */
 674         union nf_inet_addr      vaddr;          /* virtual IP address */
 675         __u32                   vfwmark;        /* firewall mark of service */
 676 };
 677
 678
 679 /*
 680  *      The scheduler object
 681  */
 682 struct ip_vs_scheduler {
 683         struct list_head        n_list;         /* d-linked list head */
 684         char                    *name;          /* scheduler name */
 685         atomic_t                refcnt;         /* reference counter */
 686         struct module           *module;        /* THIS_MODULE/NULL */
 687
 688         /* scheduler initializing service */
 689         int (*init_service)(struct ip_vs_service *svc);
 690         /* scheduling service finish */
 691         int (*done_service)(struct ip_vs_service *svc);
 692         /* scheduler updating service */
 693         int (*update_service)(struct ip_vs_service *svc);
 694
 695         /* selecting a server from the given service */
 696         struct ip_vs_dest* (*schedule)(struct ip_vs_service *svc,
 697                                        const struct sk_buff *skb);
 698 };
 699
 700 /* The persistence engine object */
 701 struct ip_vs_pe {
 702         struct list_head        n_list;         /* d-linked list head */
 703         char                    *name;          /* scheduler name */
 704         atomic_t                refcnt;         /* reference counter */
 705         struct module           *module;        /* THIS_MODULE/NULL */
 706
 707         /* get the connection template, if any */
 708         int (*fill_param)(struct ip_vs_conn_param *p, struct sk_buff *skb);
 709         bool (*ct_match)(const struct ip_vs_conn_param *p,
 710                          struct ip_vs_conn *ct);
 711         u32 (*hashkey_raw)(const struct ip_vs_conn_param *p, u32 initval,
 712                            bool inverse);
 713         int (*show_pe_data)(const struct ip_vs_conn *cp, char *buf);
 714 };
 715
 716 /*
 717  *      The application module object (a.k.a. app incarnation)
 718  */
 719 struct ip_vs_app {
 720         struct list_head        a_list;         /* member in app list */
 721         int                     type;           /* IP_VS_APP_TYPE_xxx */
 722         char                    *name;          /* application module name */
 723         __u16                   protocol;
 724         struct module           *module;        /* THIS_MODULE/NULL */
 725         struct list_head        incs_list;      /* list of incarnations */
 726
 727         /* members for application incarnations */
 728         struct list_head        p_list;         /* member in proto app list */
 729         struct ip_vs_app        *app;           /* its real application */
 730         __be16                  port;           /* port number in net order */
 731         atomic_t                usecnt;         /* usage counter */
 732
 733         /*
 734          * output hook: Process packet in inout direction, diff set for TCP.
 735          * Return: 0=Error, 1=Payload Not Mangled/Mangled but checksum is ok,
 736          *         2=Mangled but checksum was not updated
 737          */
 738         int (*pkt_out)(struct ip_vs_app *, struct ip_vs_conn *,
 739                        struct sk_buff *, int *diff);
 740
 741         /*
 742          * input hook: Process packet in outin direction, diff set for TCP.
 743          * Return: 0=Error, 1=Payload Not Mangled/Mangled but checksum is ok,
 744          *         2=Mangled but checksum was not updated
 745          */
 746         int (*pkt_in)(struct ip_vs_app *, struct ip_vs_conn *,
 747                       struct sk_buff *, int *diff);
 748
 749         /* ip_vs_app initializer */
 750         int (*init_conn)(struct ip_vs_app *, struct ip_vs_conn *);
 751
 752         /* ip_vs_app finish */
 753         int (*done_conn)(struct ip_vs_app *, struct ip_vs_conn *);
 754
 755
 756         /* not used now */
 757         int (*bind_conn)(struct ip_vs_app *, struct ip_vs_conn *,
 758                          struct ip_vs_protocol *);
 759
 760         void (*unbind_conn)(struct ip_vs_app *, struct ip_vs_conn *);
 761
 762         int *                   timeout_table;
 763         int *                   timeouts;
 764         int                     timeouts_size;
 765
 766         int (*conn_schedule)(struct sk_buff *skb, struct ip_vs_app *app,
 767                              int *verdict, struct ip_vs_conn **cpp);
 768
 769         struct ip_vs_conn *
 770         (*conn_in_get)(const struct sk_buff *skb, struct ip_vs_app *app,
 771                        const struct iphdr *iph, unsigned int proto_off,
 772                        int inverse);
 773
 774         struct ip_vs_conn *
 775         (*conn_out_get)(const struct sk_buff *skb, struct ip_vs_app *app,
 776                         const struct iphdr *iph, unsigned int proto_off,
 777                         int inverse);
 778
 779         int (*state_transition)(struct ip_vs_conn *cp, int direction,
 780                                 const struct sk_buff *skb,
 781                                 struct ip_vs_app *app);
 782
 783         void (*timeout_change)(struct ip_vs_app *app, int flags);
 784 };
 785
 786 /* IPVS in network namespace */
 787 struct netns_ipvs {
 788         int                     gen;            /* Generation */
 789         int                     enable;         /* enable like nf_hooks do */
 790         /*
 791          *      Hash table: for real service lookups
 792          */
 793         #define IP_VS_RTAB_BITS 4
 794         #define IP_VS_RTAB_SIZE (1 << IP_VS_RTAB_BITS)
 795         #define IP_VS_RTAB_MASK (IP_VS_RTAB_SIZE - 1)
 796
 797         struct list_head        rs_table[IP_VS_RTAB_SIZE];
 798         /* ip_vs_app */
 799         struct list_head        app_list;
 800         /* ip_vs_ftp */
 801         struct ip_vs_app        *ftp_app;
 802         /* ip_vs_proto */
 803         #define IP_VS_PROTO_TAB_SIZE    32      /* must be power of 2 */
 804         struct ip_vs_proto_data *proto_data_table[IP_VS_PROTO_TAB_SIZE];
 805         /* ip_vs_proto_tcp */
 806 #ifdef CONFIG_IP_VS_PROTO_TCP
 807         #define TCP_APP_TAB_BITS        4
 808         #define TCP_APP_TAB_SIZE        (1 << TCP_APP_TAB_BITS)
 809         #define TCP_APP_TAB_MASK        (TCP_APP_TAB_SIZE - 1)
 810         struct list_head        tcp_apps[TCP_APP_TAB_SIZE];
 811         spinlock_t              tcp_app_lock;
 812 #endif
 813         /* ip_vs_proto_udp */
 814 #ifdef CONFIG_IP_VS_PROTO_UDP
 815         #define UDP_APP_TAB_BITS        4
 816         #define UDP_APP_TAB_SIZE        (1 << UDP_APP_TAB_BITS)
 817         #define UDP_APP_TAB_MASK        (UDP_APP_TAB_SIZE - 1)
 818         struct list_head        udp_apps[UDP_APP_TAB_SIZE];
 819         spinlock_t              udp_app_lock;
 820 #endif
 821         /* ip_vs_proto_sctp */
 822 #ifdef CONFIG_IP_VS_PROTO_SCTP
 823         #define SCTP_APP_TAB_BITS       4
 824         #define SCTP_APP_TAB_SIZE       (1 << SCTP_APP_TAB_BITS)
 825         #define SCTP_APP_TAB_MASK       (SCTP_APP_TAB_SIZE - 1)
 826         /* Hash table for SCTP application incarnations  */
 827         struct list_head        sctp_apps[SCTP_APP_TAB_SIZE];
 828         spinlock_t              sctp_app_lock;
 829 #endif
 830         /* ip_vs_conn */
 831         atomic_t                conn_count;      /*  connection counter */
 832
 833         /* ip_vs_ctl */
 834         struct ip_vs_stats              tot_stats;  /* Statistics & est. */
 835
 836         int                     num_services;    /* no of virtual services */
 837
 838         rwlock_t                rs_lock;         /* real services table */
 839         /* Trash for destinations */
 840         struct list_head        dest_trash;
 841         /* Service counters */
 842         atomic_t                ftpsvc_counter;
 843         atomic_t                nullsvc_counter;
 844
 845 #ifdef CONFIG_SYSCTL
 846         /* 1/rate drop and drop-entry variables */
 847         struct delayed_work     defense_work;   /* Work handler */
 848         int                     drop_rate;
 849         int                     drop_counter;
 850         atomic_t                dropentry;
 851         /* locks in ctl.c */
 852         spinlock_t              dropentry_lock;  /* drop entry handling */
 853         spinlock_t              droppacket_lock; /* drop packet handling */
 854         spinlock_t              securetcp_lock;  /* state and timeout tables */
 855
 856         /* sys-ctl struct */
 857         struct ctl_table_header *sysctl_hdr;
 858         struct ctl_table        *sysctl_tbl;
 859 #endif
 860
 861         /* sysctl variables */
 862         int                     sysctl_amemthresh;
 863         int                     sysctl_am_droprate;
 864         int                     sysctl_drop_entry;
 865         int                     sysctl_drop_packet;
 866         int                     sysctl_secure_tcp;
 867 #ifdef CONFIG_IP_VS_NFCT
 868         int                     sysctl_conntrack;
 869 #endif
 870         int                     sysctl_snat_reroute;
 871         int                     sysctl_sync_ver;
 872         int                     sysctl_cache_bypass;
 873         int                     sysctl_expire_nodest_conn;
 874         int                     sysctl_expire_quiescent_template;
 875         int                     sysctl_sync_threshold[2];
 876         int                     sysctl_nat_icmp_send;
 877
 878         /* ip_vs_lblc */
 879         int                     sysctl_lblc_expiration;
 880         struct ctl_table_header *lblc_ctl_header;
 881         struct ctl_table        *lblc_ctl_table;
 882         /* ip_vs_lblcr */
 883         int                     sysctl_lblcr_expiration;
 884         struct ctl_table_header *lblcr_ctl_header;
 885         struct ctl_table        *lblcr_ctl_table;
 886         /* ip_vs_est */
 887         struct list_head        est_list;       /* estimator list */
 888         spinlock_t              est_lock;
 889         struct timer_list       est_timer;      /* Estimation timer */
 890         /* ip_vs_sync */
 891         struct list_head        sync_queue;
 892         spinlock_t              sync_lock;
 893         struct ip_vs_sync_buff  *sync_buff;
 894         spinlock_t              sync_buff_lock;
 895         struct sockaddr_in      sync_mcast_addr;
 896         struct task_struct      *master_thread;
 897         struct task_struct      *backup_thread;
 898         int                     send_mesg_maxlen;
 899         int                     recv_mesg_maxlen;
 900         volatile int            sync_state;
 901         volatile int            master_syncid;
 902         volatile int            backup_syncid;
 903         struct mutex            sync_mutex;
 904         /* multicast interface name */
 905         char                    master_mcast_ifn[IP_VS_IFNAME_MAXLEN];
 906         char                    backup_mcast_ifn[IP_VS_IFNAME_MAXLEN];
 907         /* net name space ptr */
 908         struct net              *net;            /* Needed by timer routines */
 909 };
 910
 911 #define DEFAULT_SYNC_THRESHOLD  3
 912 #define DEFAULT_SYNC_PERIOD     50
 913 #define DEFAULT_SYNC_VER        1
 914
 915 #ifdef CONFIG_SYSCTL
 916
 917 static inline int sysctl_sync_threshold(struct netns_ipvs *ipvs)
 918 {
 919         return ipvs->sysctl_sync_threshold[0];
 920 }
 921
 922 static inline int sysctl_sync_period(struct netns_ipvs *ipvs)
 923 {
 924         return ipvs->sysctl_sync_threshold[1];
 925 }
 926
 927 static inline int sysctl_sync_ver(struct netns_ipvs *ipvs)
 928 {
 929         return ipvs->sysctl_sync_ver;
 930 }
 931
 932 #else
 933
 934 static inline int sysctl_sync_threshold(struct netns_ipvs *ipvs)
 935 {
 936         return DEFAULT_SYNC_THRESHOLD;
 937 }
 938
 939 static inline int sysctl_sync_period(struct netns_ipvs *ipvs)
 940 {
 941         return DEFAULT_SYNC_PERIOD;
 942 }
 943
 944 static inline int sysctl_sync_ver(struct netns_ipvs *ipvs)
 945 {
 946         return DEFAULT_SYNC_VER;
 947 }
 948
 949 #endif
 950
 951 /*
 952  *      IPVS core functions
 953  *      (from ip_vs_core.c)
 954  */
 955 extern const char *ip_vs_proto_name(unsigned proto);
 956 extern void ip_vs_init_hash_table(struct list_head *table, int rows);
 957 #define IP_VS_INIT_HASH_TABLE(t) ip_vs_init_hash_table((t), ARRAY_SIZE((t)))
 958
 959 #define IP_VS_APP_TYPE_FTP      1
 960
 961 /*
 962  *     ip_vs_conn handling functions
 963  *     (from ip_vs_conn.c)
 964  */
 965
 966 enum {
 967         IP_VS_DIR_INPUT = 0,
 968         IP_VS_DIR_OUTPUT,
 969         IP_VS_DIR_INPUT_ONLY,
 970         IP_VS_DIR_LAST,
 971 };
 972
 973 static inline void ip_vs_conn_fill_param(struct net *net, int af, int protocol,
 974                                          const union nf_inet_addr *caddr,
 975                                          __be16 cport,
 976                                          const union nf_inet_addr *vaddr,
 977                                          __be16 vport,
 978                                          struct ip_vs_conn_param *p)
 979 {
 980         p->net = net;
 981         p->af = af;
 982         p->protocol = protocol;
 983         p->caddr = caddr;
 984         p->cport = cport;
 985         p->vaddr = vaddr;
 986         p->vport = vport;
 987         p->pe = NULL;
 988         p->pe_data = NULL;
 989 }
 990
 991 struct ip_vs_conn *ip_vs_conn_in_get(const struct ip_vs_conn_param *p);
 992 struct ip_vs_conn *ip_vs_ct_in_get(const struct ip_vs_conn_param *p);
 993
 994 struct ip_vs_conn * ip_vs_conn_in_get_proto(int af, const struct sk_buff *skb,
 995                                             const struct ip_vs_iphdr *iph,
 996                                             unsigned int proto_off,
 997                                             int inverse);
 998
 999 struct ip_vs_conn *ip_vs_conn_out_get(const struct ip_vs_conn_param *p);
1000
1001 struct ip_vs_conn * ip_vs_conn_out_get_proto(int af, const struct sk_buff *skb,
1002                                              const struct ip_vs_iphdr *iph,
1003                                              unsigned int proto_off,
1004                                              int inverse);
1005
1006 /* put back the conn without restarting its timer */
1007 static inline void __ip_vs_conn_put(struct ip_vs_conn *cp)
1008 {
1009         atomic_dec(&cp->refcnt);
1010 }
1011 extern void ip_vs_conn_put(struct ip_vs_conn *cp);
1012 extern void ip_vs_conn_fill_cport(struct ip_vs_conn *cp, __be16 cport);
1013
1014 struct ip_vs_conn *ip_vs_conn_new(const struct ip_vs_conn_param *p,
1015                                   const union nf_inet_addr *daddr,
1016                                   __be16 dport, unsigned flags,
1017                                   struct ip_vs_dest *dest, __u32 fwmark);
1018 extern void ip_vs_conn_expire_now(struct ip_vs_conn *cp);
1019
1020 extern const char * ip_vs_state_name(__u16 proto, int state);
1021
1022 extern void ip_vs_tcp_conn_listen(struct net *net, struct ip_vs_conn *cp);
1023 extern int ip_vs_check_template(struct ip_vs_conn *ct);
1024 extern void ip_vs_random_dropentry(struct net *net);
1025 extern int ip_vs_conn_init(void);
1026 extern void ip_vs_conn_cleanup(void);
1027
1028 static inline void ip_vs_control_del(struct ip_vs_conn *cp)
1029 {
1030         struct ip_vs_conn *ctl_cp = cp->control;
1031         if (!ctl_cp) {
1032                 IP_VS_ERR_BUF("request control DEL for uncontrolled: "
1033                               "%s:%d to %s:%d\n",
1034                               IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1035                               ntohs(cp->cport),
1036                               IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1037                               ntohs(cp->vport));
1038
1039                 return;
1040         }
1041
1042         IP_VS_DBG_BUF(7, "DELeting control for: "
1043                       "cp.dst=%s:%d ctl_cp.dst=%s:%d\n",
1044                       IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1045                       ntohs(cp->cport),
1046                       IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr),
1047                       ntohs(ctl_cp->cport));
1048
1049         cp->control = NULL;
1050         if (atomic_read(&ctl_cp->n_control) == 0) {
1051                 IP_VS_ERR_BUF("BUG control DEL with n=0 : "
1052                               "%s:%d to %s:%d\n",
1053                               IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1054                               ntohs(cp->cport),
1055                               IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1056                               ntohs(cp->vport));
1057
1058                 return;
1059         }
1060         atomic_dec(&ctl_cp->n_control);
1061 }
1062
1063 static inline void
1064 ip_vs_control_add(struct ip_vs_conn *cp, struct ip_vs_conn *ctl_cp)
1065 {
1066         if (cp->control) {
1067                 IP_VS_ERR_BUF("request control ADD for already controlled: "
1068                               "%s:%d to %s:%d\n",
1069                               IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1070                               ntohs(cp->cport),
1071                               IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1072                               ntohs(cp->vport));
1073
1074                 ip_vs_control_del(cp);
1075         }
1076
1077         IP_VS_DBG_BUF(7, "ADDing control for: "
1078                       "cp.dst=%s:%d ctl_cp.dst=%s:%d\n",
1079                       IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1080                       ntohs(cp->cport),
1081                       IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr),
1082                       ntohs(ctl_cp->cport));
1083
1084         cp->control = ctl_cp;
1085         atomic_inc(&ctl_cp->n_control);
1086 }
1087
1088 /*
1089  * IPVS netns init & cleanup functions
1090  */
1091 extern int ip_vs_estimator_net_init(struct net *net);
1092 extern int ip_vs_control_net_init(struct net *net);
1093 extern int ip_vs_protocol_net_init(struct net *net);
1094 extern int ip_vs_app_net_init(struct net *net);
1095 extern int ip_vs_conn_net_init(struct net *net);
1096 extern int ip_vs_sync_net_init(struct net *net);
1097 extern void ip_vs_conn_net_cleanup(struct net *net);
1098 extern void ip_vs_app_net_cleanup(struct net *net);
1099 extern void ip_vs_protocol_net_cleanup(struct net *net);
1100 extern void ip_vs_control_net_cleanup(struct net *net);
1101 extern void ip_vs_estimator_net_cleanup(struct net *net);
1102 extern void ip_vs_sync_net_cleanup(struct net *net);
1103 extern void ip_vs_service_net_cleanup(struct net *net);
1104
1105 /*
1106  *      IPVS application functions
1107  *      (from ip_vs_app.c)
1108  */
1109 #define IP_VS_APP_MAX_PORTS  8
1110 extern int register_ip_vs_app(struct net *net, struct ip_vs_app *app);
1111 extern void unregister_ip_vs_app(struct net *net, struct ip_vs_app *app);
1112 extern int ip_vs_bind_app(struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1113 extern void ip_vs_unbind_app(struct ip_vs_conn *cp);
1114 extern int register_ip_vs_app_inc(struct net *net, struct ip_vs_app *app,
1115                                   __u16 proto, __u16 port);
1116 extern int ip_vs_app_inc_get(struct ip_vs_app *inc);
1117 extern void ip_vs_app_inc_put(struct ip_vs_app *inc);
1118
1119 extern int ip_vs_app_pkt_out(struct ip_vs_conn *, struct sk_buff *skb);
1120 extern int ip_vs_app_pkt_in(struct ip_vs_conn *, struct sk_buff *skb);
1121
1122 void ip_vs_bind_pe(struct ip_vs_service *svc, struct ip_vs_pe *pe);
1123 void ip_vs_unbind_pe(struct ip_vs_service *svc);
1124 int register_ip_vs_pe(struct ip_vs_pe *pe);
1125 int unregister_ip_vs_pe(struct ip_vs_pe *pe);
1126 struct ip_vs_pe *ip_vs_pe_getbyname(const char *name);
1127 struct ip_vs_pe *__ip_vs_pe_getbyname(const char *pe_name);
1128
1129 /*
1130  * Use a #define to avoid all of module.h just for these trivial ops
1131  */
1132 #define ip_vs_pe_get(pe)                        \
1133         if (pe && pe->module)                   \
1134                 __module_get(pe->module);
1135
1136 #define ip_vs_pe_put(pe)                        \
1137         if (pe && pe->module)                   \
1138                 module_put(pe->module);
1139
1140 /*
1141  *      IPVS protocol functions (from ip_vs_proto.c)
1142  */
1143 extern int ip_vs_protocol_init(void);
1144 extern void ip_vs_protocol_cleanup(void);
1145 extern void ip_vs_protocol_timeout_change(struct netns_ipvs *ipvs, int flags);
1146 extern int *ip_vs_create_timeout_table(int *table, int size);
1147 extern int
1148 ip_vs_set_state_timeout(int *table, int num, const char *const *names,
1149                         const char *name, int to);
1150 extern void
1151 ip_vs_tcpudp_debug_packet(int af, struct ip_vs_protocol *pp,
1152                           const struct sk_buff *skb,
1153                           int offset, const char *msg);
1154
1155 extern struct ip_vs_protocol ip_vs_protocol_tcp;
1156 extern struct ip_vs_protocol ip_vs_protocol_udp;
1157 extern struct ip_vs_protocol ip_vs_protocol_icmp;
1158 extern struct ip_vs_protocol ip_vs_protocol_esp;
1159 extern struct ip_vs_protocol ip_vs_protocol_ah;
1160 extern struct ip_vs_protocol ip_vs_protocol_sctp;
1161
1162 /*
1163  *      Registering/unregistering scheduler functions
1164  *      (from ip_vs_sched.c)
1165  */
1166 extern int register_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
1167 extern int unregister_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
1168 extern int ip_vs_bind_scheduler(struct ip_vs_service *svc,
1169                                 struct ip_vs_scheduler *scheduler);
1170 extern int ip_vs_unbind_scheduler(struct ip_vs_service *svc);
1171 extern struct ip_vs_scheduler *ip_vs_scheduler_get(const char *sched_name);
1172 extern void ip_vs_scheduler_put(struct ip_vs_scheduler *scheduler);
1173 extern struct ip_vs_conn *
1174 ip_vs_schedule(struct ip_vs_service *svc, struct sk_buff *skb,
1175                struct ip_vs_proto_data *pd, int *ignored);
1176 extern int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb,
1177                         struct ip_vs_proto_data *pd);
1178
1179 extern void ip_vs_scheduler_err(struct ip_vs_service *svc, const char *msg);
1180
1181
1182 /*
1183  *      IPVS control data and functions (from ip_vs_ctl.c)
1184  */
1185 extern struct ip_vs_stats ip_vs_stats;
1186 extern const struct ctl_path net_vs_ctl_path[];
1187 extern int sysctl_ip_vs_sync_ver;
1188
1189 extern void ip_vs_sync_switch_mode(struct net *net, int mode);
1190 extern struct ip_vs_service *
1191 ip_vs_service_get(struct net *net, int af, __u32 fwmark, __u16 protocol,
1192                   const union nf_inet_addr *vaddr, __be16 vport);
1193
1194 static inline void ip_vs_service_put(struct ip_vs_service *svc)
1195 {
1196         atomic_dec(&svc->usecnt);
1197 }
1198
1199 extern struct ip_vs_dest *
1200 ip_vs_lookup_real_service(struct net *net, int af, __u16 protocol,
1201                           const union nf_inet_addr *daddr, __be16 dport);
1202
1203 extern int ip_vs_use_count_inc(void);
1204 extern void ip_vs_use_count_dec(void);
1205 extern int ip_vs_control_init(void);
1206 extern void ip_vs_control_cleanup(void);
1207 extern struct ip_vs_dest *
1208 ip_vs_find_dest(struct net *net, int af, const union nf_inet_addr *daddr,
1209                 __be16 dport, const union nf_inet_addr *vaddr, __be16 vport,
1210                 __u16 protocol, __u32 fwmark);
1211 extern struct ip_vs_dest *ip_vs_try_bind_dest(struct ip_vs_conn *cp);
1212
1213
1214 /*
1215  *      IPVS sync daemon data and function prototypes
1216  *      (from ip_vs_sync.c)
1217  */
1218 extern int start_sync_thread(struct net *net, int state, char *mcast_ifn,
1219                              __u8 syncid);
1220 extern int stop_sync_thread(struct net *net, int state);
1221 extern void ip_vs_sync_conn(struct net *net, struct ip_vs_conn *cp);
1222
1223
1224 /*
1225  *      IPVS rate estimator prototypes (from ip_vs_est.c)
1226  */
1227 extern void ip_vs_start_estimator(struct net *net, struct ip_vs_stats *stats);
1228 extern void ip_vs_stop_estimator(struct net *net, struct ip_vs_stats *stats);
1229 extern void ip_vs_zero_estimator(struct ip_vs_stats *stats);
1230 extern void ip_vs_read_estimator(struct ip_vs_stats_user *dst,
1231                                  struct ip_vs_stats *stats);
1232
1233 /*
1234  *      Various IPVS packet transmitters (from ip_vs_xmit.c)
1235  */
1236 extern int ip_vs_null_xmit
1237 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1238 extern int ip_vs_bypass_xmit
1239 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1240 extern int ip_vs_nat_xmit
1241 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1242 extern int ip_vs_tunnel_xmit
1243 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1244 extern int ip_vs_dr_xmit
1245 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1246 extern int ip_vs_icmp_xmit
1247 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp,
1248  int offset, unsigned int hooknum);
1249 extern void ip_vs_dst_reset(struct ip_vs_dest *dest);
1250
1251 #ifdef CONFIG_IP_VS_IPV6
1252 extern int ip_vs_bypass_xmit_v6
1253 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1254 extern int ip_vs_nat_xmit_v6
1255 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1256 extern int ip_vs_tunnel_xmit_v6
1257 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1258 extern int ip_vs_dr_xmit_v6
1259 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1260 extern int ip_vs_icmp_xmit_v6
1261 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp,
1262  int offset, unsigned int hooknum);
1263 #endif
1264
1265 #ifdef CONFIG_SYSCTL
1266 /*
1267  *      This is a simple mechanism to ignore packets when
1268  *      we are loaded. Just set ip_vs_drop_rate to 'n' and
1269  *      we start to drop 1/rate of the packets
1270  */
1271
1272 static inline int ip_vs_todrop(struct netns_ipvs *ipvs)
1273 {
1274         if (!ipvs->drop_rate)
1275                 return 0;
1276         if (--ipvs->drop_counter > 0)
1277                 return 0;
1278         ipvs->drop_counter = ipvs->drop_rate;
1279         return 1;
1280 }
1281 #else
1282 static inline int ip_vs_todrop(struct netns_ipvs *ipvs) { return 0; }
1283 #endif
1284
1285 /*
1286  *      ip_vs_fwd_tag returns the forwarding tag of the connection
1287  */
1288 #define IP_VS_FWD_METHOD(cp)  (cp->flags & IP_VS_CONN_F_FWD_MASK)
1289
1290 static inline char ip_vs_fwd_tag(struct ip_vs_conn *cp)
1291 {
1292         char fwd;
1293
1294         switch (IP_VS_FWD_METHOD(cp)) {
1295         case IP_VS_CONN_F_MASQ:
1296                 fwd = 'M'; break;
1297         case IP_VS_CONN_F_LOCALNODE:
1298                 fwd = 'L'; break;
1299         case IP_VS_CONN_F_TUNNEL:
1300                 fwd = 'T'; break;
1301         case IP_VS_CONN_F_DROUTE:
1302                 fwd = 'R'; break;
1303         case IP_VS_CONN_F_BYPASS:
1304                 fwd = 'B'; break;
1305         default:
1306                 fwd = '?'; break;
1307         }
1308         return fwd;
1309 }
1310
1311 extern void ip_vs_nat_icmp(struct sk_buff *skb, struct ip_vs_protocol *pp,
1312                            struct ip_vs_conn *cp, int dir);
1313
1314 #ifdef CONFIG_IP_VS_IPV6
1315 extern void ip_vs_nat_icmp_v6(struct sk_buff *skb, struct ip_vs_protocol *pp,
1316                               struct ip_vs_conn *cp, int dir);
1317 #endif
1318
1319 extern __sum16 ip_vs_checksum_complete(struct sk_buff *skb, int offset);
1320
1321 static inline __wsum ip_vs_check_diff4(__be32 old, __be32 new, __wsum oldsum)
1322 {
1323         __be32 diff[2] = { ~old, new };
1324
1325         return csum_partial(diff, sizeof(diff), oldsum);
1326 }
1327
1328 #ifdef CONFIG_IP_VS_IPV6
1329 static inline __wsum ip_vs_check_diff16(const __be32 *old, const __be32 *new,
1330                                         __wsum oldsum)
1331 {
1332         __be32 diff[8] = { ~old[3], ~old[2], ~old[1], ~old[0],
1333                             new[3],  new[2],  new[1],  new[0] };
1334
1335         return csum_partial(diff, sizeof(diff), oldsum);
1336 }
1337 #endif
1338
1339 static inline __wsum ip_vs_check_diff2(__be16 old, __be16 new, __wsum oldsum)
1340 {
1341         __be16 diff[2] = { ~old, new };
1342
1343         return csum_partial(diff, sizeof(diff), oldsum);
1344 }
1345
1346 /*
1347  * Forget current conntrack (unconfirmed) and attach notrack entry
1348  */
1349 static inline void ip_vs_notrack(struct sk_buff *skb)
1350 {
1351 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
1352         enum ip_conntrack_info ctinfo;
1353         struct nf_conn *ct = nf_ct_get(skb, &ctinfo);
1354
1355         if (!ct || !nf_ct_is_untracked(ct)) {
1356                 nf_reset(skb);
1357                 skb->nfct = &nf_ct_untracked_get()->ct_general;
1358                 skb->nfctinfo = IP_CT_NEW;
1359                 nf_conntrack_get(skb->nfct);
1360         }
1361 #endif
1362 }
1363
1364 #ifdef CONFIG_IP_VS_NFCT
1365 /*
1366  *      Netfilter connection tracking
1367  *      (from ip_vs_nfct.c)
1368  */
1369 static inline int ip_vs_conntrack_enabled(struct netns_ipvs *ipvs)
1370 {
1371 #ifdef CONFIG_SYSCTL
1372         return ipvs->sysctl_conntrack;
1373 #else
1374         return 0;
1375 #endif
1376 }
1377
1378 extern void ip_vs_update_conntrack(struct sk_buff *skb, struct ip_vs_conn *cp,
1379                                    int outin);
1380 extern int ip_vs_confirm_conntrack(struct sk_buff *skb);
1381 extern void ip_vs_nfct_expect_related(struct sk_buff *skb, struct nf_conn *ct,
1382                                       struct ip_vs_conn *cp, u_int8_t proto,
1383                                       const __be16 port, int from_rs);
1384 extern void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp);
1385
1386 #else
1387
1388 static inline int ip_vs_conntrack_enabled(struct netns_ipvs *ipvs)
1389 {
1390         return 0;
1391 }
1392
1393 static inline void ip_vs_update_conntrack(struct sk_buff *skb,
1394                                           struct ip_vs_conn *cp, int outin)
1395 {
1396 }
1397
1398 static inline int ip_vs_confirm_conntrack(struct sk_buff *skb)
1399 {
1400         return NF_ACCEPT;
1401 }
1402
1403 static inline void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp)
1404 {
1405 }
1406 /* CONFIG_IP_VS_NFCT */
1407 #endif
1408
1409 static inline unsigned int
1410 ip_vs_dest_conn_overhead(struct ip_vs_dest *dest)
1411 {
1412         /*
1413          * We think the overhead of processing active connections is 256
1414          * times higher than that of inactive connections in average. (This
1415          * 256 times might not be accurate, we will change it later) We
1416          * use the following formula to estimate the overhead now:
1417          *                dest->activeconns*256 + dest->inactconns
1418          */
1419         return (atomic_read(&dest->activeconns) << 8) +
1420                 atomic_read(&dest->inactconns);
1421 }
1422
1423 #endif  /* _NET_IP_VS_H */