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