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   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
  29 struct ip_vs_iphdr {
  30         int len;
  31         __u8 protocol;
  32         union nf_inet_addr saddr;
  33         union nf_inet_addr daddr;
  34 };
  35
  36 static inline void
  37 ip_vs_fill_iphdr(int af, const void *nh, struct ip_vs_iphdr *iphdr)
  38 {
  39 #ifdef CONFIG_IP_VS_IPV6
  40         if (af == AF_INET6) {
  41                 const struct ipv6hdr *iph = nh;
  42                 iphdr->len = sizeof(struct ipv6hdr);
  43                 iphdr->protocol = iph->nexthdr;
  44                 ipv6_addr_copy(&iphdr->saddr.in6, &iph->saddr);
  45                 ipv6_addr_copy(&iphdr->daddr.in6, &iph->daddr);
  46         } else
  47 #endif
  48         {
  49                 const struct iphdr *iph = nh;
  50                 iphdr->len = iph->ihl * 4;
  51                 iphdr->protocol = iph->protocol;
  52                 iphdr->saddr.ip = iph->saddr;
  53                 iphdr->daddr.ip = iph->daddr;
  54         }
  55 }
  56
  57 static inline void ip_vs_addr_copy(int af, union nf_inet_addr *dst,
  58                                    const union nf_inet_addr *src)
  59 {
  60 #ifdef CONFIG_IP_VS_IPV6
  61         if (af == AF_INET6)
  62                 ipv6_addr_copy(&dst->in6, &src->in6);
  63         else
  64 #endif
  65         dst->ip = src->ip;
  66 }
  67
  68 static inline int ip_vs_addr_equal(int af, const union nf_inet_addr *a,
  69                                    const union nf_inet_addr *b)
  70 {
  71 #ifdef CONFIG_IP_VS_IPV6
  72         if (af == AF_INET6)
  73                 return ipv6_addr_equal(&a->in6, &b->in6);
  74 #endif
  75         return a->ip == b->ip;
  76 }
  77
  78 #ifdef CONFIG_IP_VS_DEBUG
  79 #include <linux/net.h>
  80
  81 extern int ip_vs_get_debug_level(void);
  82
  83 static inline const char *ip_vs_dbg_addr(int af, char *buf, size_t buf_len,
  84                                          const union nf_inet_addr *addr,
  85                                          int *idx)
  86 {
  87         int len;
  88 #ifdef CONFIG_IP_VS_IPV6
  89         if (af == AF_INET6)
  90                 len = snprintf(&buf[*idx], buf_len - *idx, "[%pI6]",
  91                                &addr->in6) + 1;
  92         else
  93 #endif
  94                 len = snprintf(&buf[*idx], buf_len - *idx, "%pI4",
  95                                &addr->ip) + 1;
  96
  97         *idx += len;
  98         BUG_ON(*idx > buf_len + 1);
  99         return &buf[*idx - len];
 100 }
 101
 102 #define IP_VS_DBG_BUF(level, msg, ...)                                  \
 103         do {                                                            \
 104                 char ip_vs_dbg_buf[160];                                \
 105                 int ip_vs_dbg_idx = 0;                                  \
 106                 if (level <= ip_vs_get_debug_level())                   \
 107                         printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__);  \
 108         } while (0)
 109 #define IP_VS_ERR_BUF(msg...)                                           \
 110         do {                                                            \
 111                 char ip_vs_dbg_buf[160];                                \
 112                 int ip_vs_dbg_idx = 0;                                  \
 113                 pr_err(msg);                                            \
 114         } while (0)
 115
 116 /* Only use from within IP_VS_DBG_BUF() or IP_VS_ERR_BUF macros */
 117 #define IP_VS_DBG_ADDR(af, addr)                                        \
 118         ip_vs_dbg_addr(af, ip_vs_dbg_buf,                               \
 119                        sizeof(ip_vs_dbg_buf), addr,                     \
 120                        &ip_vs_dbg_idx)
 121
 122 #define IP_VS_DBG(level, msg, ...)                                      \
 123         do {                                                            \
 124                 if (level <= ip_vs_get_debug_level())                   \
 125                         printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__);  \
 126         } while (0)
 127 #define IP_VS_DBG_RL(msg, ...)                                          \
 128         do {                                                            \
 129                 if (net_ratelimit())                                    \
 130                         printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__);  \
 131         } while (0)
 132 #define IP_VS_DBG_PKT(level, pp, skb, ofs, msg)                         \
 133         do {                                                            \
 134                 if (level <= ip_vs_get_debug_level())                   \
 135                         pp->debug_packet(pp, skb, ofs, msg);            \
 136         } while (0)
 137 #define IP_VS_DBG_RL_PKT(level, pp, skb, ofs, msg)                      \
 138         do {                                                            \
 139                 if (level <= ip_vs_get_debug_level() &&                 \
 140                     net_ratelimit())                                    \
 141                         pp->debug_packet(pp, skb, ofs, msg);            \
 142         } while (0)
 143 #else   /* NO DEBUGGING at ALL */
 144 #define IP_VS_DBG_BUF(level, msg...)  do {} while (0)
 145 #define IP_VS_ERR_BUF(msg...)  do {} while (0)
 146 #define IP_VS_DBG(level, msg...)  do {} while (0)
 147 #define IP_VS_DBG_RL(msg...)  do {} while (0)
 148 #define IP_VS_DBG_PKT(level, pp, skb, ofs, msg)         do {} while (0)
 149 #define IP_VS_DBG_RL_PKT(level, pp, skb, ofs, msg)      do {} while (0)
 150 #endif
 151
 152 #define IP_VS_BUG() BUG()
 153 #define IP_VS_ERR_RL(msg, ...)                                          \
 154         do {                                                            \
 155                 if (net_ratelimit())                                    \
 156                         pr_err(msg, ##__VA_ARGS__);                     \
 157         } while (0)
 158
 159 #ifdef CONFIG_IP_VS_DEBUG
 160 #define EnterFunction(level)                                            \
 161         do {                                                            \
 162                 if (level <= ip_vs_get_debug_level())                   \
 163                         printk(KERN_DEBUG                               \
 164                                pr_fmt("Enter: %s, %s line %i\n"),       \
 165                                __func__, __FILE__, __LINE__);           \
 166         } while (0)
 167 #define LeaveFunction(level)                                            \
 168         do {                                                            \
 169                 if (level <= ip_vs_get_debug_level())                   \
 170                         printk(KERN_DEBUG                               \
 171                                pr_fmt("Leave: %s, %s line %i\n"),       \
 172                                __func__, __FILE__, __LINE__);           \
 173         } while (0)
 174 #else
 175 #define EnterFunction(level)   do {} while (0)
 176 #define LeaveFunction(level)   do {} while (0)
 177 #endif
 178
 179 #define IP_VS_WAIT_WHILE(expr)  while (expr) { cpu_relax(); }
 180
 181
 182 /*
 183  *      The port number of FTP service (in network order).
 184  */
 185 #define FTPPORT  cpu_to_be16(21)
 186 #define FTPDATA  cpu_to_be16(20)
 187
 188 /*
 189  *      TCP State Values
 190  */
 191 enum {
 192         IP_VS_TCP_S_NONE = 0,
 193         IP_VS_TCP_S_ESTABLISHED,
 194         IP_VS_TCP_S_SYN_SENT,
 195         IP_VS_TCP_S_SYN_RECV,
 196         IP_VS_TCP_S_FIN_WAIT,
 197         IP_VS_TCP_S_TIME_WAIT,
 198         IP_VS_TCP_S_CLOSE,
 199         IP_VS_TCP_S_CLOSE_WAIT,
 200         IP_VS_TCP_S_LAST_ACK,
 201         IP_VS_TCP_S_LISTEN,
 202         IP_VS_TCP_S_SYNACK,
 203         IP_VS_TCP_S_LAST
 204 };
 205
 206 /*
 207  *      UDP State Values
 208  */
 209 enum {
 210         IP_VS_UDP_S_NORMAL,
 211         IP_VS_UDP_S_LAST,
 212 };
 213
 214 /*
 215  *      ICMP State Values
 216  */
 217 enum {
 218         IP_VS_ICMP_S_NORMAL,
 219         IP_VS_ICMP_S_LAST,
 220 };
 221
 222 /*
 223  *      Delta sequence info structure
 224  *      Each ip_vs_conn has 2 (output AND input seq. changes).
 225  *      Only used in the VS/NAT.
 226  */
 227 struct ip_vs_seq {
 228         __u32                   init_seq;       /* Add delta from this seq */
 229         __u32                   delta;          /* Delta in sequence numbers */
 230         __u32                   previous_delta; /* Delta in sequence numbers
 231                                                    before last resized pkt */
 232 };
 233
 234
 235 /*
 236  *      IPVS statistics objects
 237  */
 238 struct ip_vs_estimator {
 239         struct list_head        list;
 240
 241         u64                     last_inbytes;
 242         u64                     last_outbytes;
 243         u32                     last_conns;
 244         u32                     last_inpkts;
 245         u32                     last_outpkts;
 246
 247         u32                     cps;
 248         u32                     inpps;
 249         u32                     outpps;
 250         u32                     inbps;
 251         u32                     outbps;
 252 };
 253
 254 struct ip_vs_stats
 255 {
 256         struct ip_vs_stats_user ustats;         /* statistics */
 257         struct ip_vs_estimator  est;            /* estimator */
 258
 259         spinlock_t              lock;           /* spin lock */
 260 };
 261
 262 struct dst_entry;
 263 struct iphdr;
 264 struct ip_vs_conn;
 265 struct ip_vs_app;
 266 struct sk_buff;
 267
 268 struct ip_vs_protocol {
 269         struct ip_vs_protocol   *next;
 270         char                    *name;
 271         u16                     protocol;
 272         u16                     num_states;
 273         int                     dont_defrag;
 274         atomic_t                appcnt;         /* counter of proto app incs */
 275         int                     *timeout_table; /* protocol timeout table */
 276
 277         void (*init)(struct ip_vs_protocol *pp);
 278
 279         void (*exit)(struct ip_vs_protocol *pp);
 280
 281         int (*conn_schedule)(int af, struct sk_buff *skb,
 282                              struct ip_vs_protocol *pp,
 283                              int *verdict, struct ip_vs_conn **cpp);
 284
 285         struct ip_vs_conn *
 286         (*conn_in_get)(int af,
 287                        const struct sk_buff *skb,
 288                        struct ip_vs_protocol *pp,
 289                        const struct ip_vs_iphdr *iph,
 290                        unsigned int proto_off,
 291                        int inverse);
 292
 293         struct ip_vs_conn *
 294         (*conn_out_get)(int af,
 295                         const struct sk_buff *skb,
 296                         struct ip_vs_protocol *pp,
 297                         const struct ip_vs_iphdr *iph,
 298                         unsigned int proto_off,
 299                         int inverse);
 300
 301         int (*snat_handler)(struct sk_buff *skb,
 302                             struct ip_vs_protocol *pp, struct ip_vs_conn *cp);
 303
 304         int (*dnat_handler)(struct sk_buff *skb,
 305                             struct ip_vs_protocol *pp, struct ip_vs_conn *cp);
 306
 307         int (*csum_check)(int af, struct sk_buff *skb,
 308                           struct ip_vs_protocol *pp);
 309
 310         const char *(*state_name)(int state);
 311
 312         int (*state_transition)(struct ip_vs_conn *cp, int direction,
 313                                 const struct sk_buff *skb,
 314                                 struct ip_vs_protocol *pp);
 315
 316         int (*register_app)(struct ip_vs_app *inc);
 317
 318         void (*unregister_app)(struct ip_vs_app *inc);
 319
 320         int (*app_conn_bind)(struct ip_vs_conn *cp);
 321
 322         void (*debug_packet)(struct ip_vs_protocol *pp,
 323                              const struct sk_buff *skb,
 324                              int offset,
 325                              const char *msg);
 326
 327         void (*timeout_change)(struct ip_vs_protocol *pp, int flags);
 328
 329         int (*set_state_timeout)(struct ip_vs_protocol *pp, char *sname, int to);
 330 };
 331
 332 extern struct ip_vs_protocol * ip_vs_proto_get(unsigned short proto);
 333
 334 /*
 335  *      IP_VS structure allocated for each dynamically scheduled connection
 336  */
 337 struct ip_vs_conn {
 338         struct list_head        c_list;         /* hashed list heads */
 339
 340         /* Protocol, addresses and port numbers */
 341         u16                      af;            /* address family */
 342         union nf_inet_addr       caddr;          /* client address */
 343         union nf_inet_addr       vaddr;          /* virtual address */
 344         union nf_inet_addr       daddr;          /* destination address */
 345         __be16                   cport;
 346         __be16                   vport;
 347         __be16                   dport;
 348         __u16                   protocol;       /* Which protocol (TCP/UDP) */
 349
 350         /* counter and timer */
 351         atomic_t                refcnt;         /* reference count */
 352         struct timer_list       timer;          /* Expiration timer */
 353         volatile unsigned long  timeout;        /* timeout */
 354
 355         /* Flags and state transition */
 356         spinlock_t              lock;           /* lock for state transition */
 357         volatile __u16          flags;          /* status flags */
 358         volatile __u16          state;          /* state info */
 359         volatile __u16          old_state;      /* old state, to be used for
 360                                                  * state transition triggerd
 361                                                  * synchronization
 362                                                  */
 363
 364         /* Control members */
 365         struct ip_vs_conn       *control;       /* Master control connection */
 366         atomic_t                n_control;      /* Number of controlled ones */
 367         struct ip_vs_dest       *dest;          /* real server */
 368         atomic_t                in_pkts;        /* incoming packet counter */
 369
 370         /* packet transmitter for different forwarding methods.  If it
 371            mangles the packet, it must return NF_DROP or better NF_STOLEN,
 372            otherwise this must be changed to a sk_buff **.
 373          */
 374         int (*packet_xmit)(struct sk_buff *skb, struct ip_vs_conn *cp,
 375                            struct ip_vs_protocol *pp);
 376
 377         /* Note: we can group the following members into a structure,
 378            in order to save more space, and the following members are
 379            only used in VS/NAT anyway */
 380         struct ip_vs_app        *app;           /* bound ip_vs_app object */
 381         void                    *app_data;      /* Application private data */
 382         struct ip_vs_seq        in_seq;         /* incoming seq. struct */
 383         struct ip_vs_seq        out_seq;        /* outgoing seq. struct */
 384 };
 385
 386
 387 /*
 388  *      Extended internal versions of struct ip_vs_service_user and
 389  *      ip_vs_dest_user for IPv6 support.
 390  *
 391  *      We need these to conveniently pass around service and destination
 392  *      options, but unfortunately, we also need to keep the old definitions to
 393  *      maintain userspace backwards compatibility for the setsockopt interface.
 394  */
 395 struct ip_vs_service_user_kern {
 396         /* virtual service addresses */
 397         u16                     af;
 398         u16                     protocol;
 399         union nf_inet_addr      addr;           /* virtual ip address */
 400         u16                     port;
 401         u32                     fwmark;         /* firwall mark of service */
 402
 403         /* virtual service options */
 404         char                    *sched_name;
 405         unsigned                flags;          /* virtual service flags */
 406         unsigned                timeout;        /* persistent timeout in sec */
 407         u32                     netmask;        /* persistent netmask */
 408 };
 409
 410
 411 struct ip_vs_dest_user_kern {
 412         /* destination server address */
 413         union nf_inet_addr      addr;
 414         u16                     port;
 415
 416         /* real server options */
 417         unsigned                conn_flags;     /* connection flags */
 418         int                     weight;         /* destination weight */
 419
 420         /* thresholds for active connections */
 421         u32                     u_threshold;    /* upper threshold */
 422         u32                     l_threshold;    /* lower threshold */
 423 };
 424
 425
 426 /*
 427  *      The information about the virtual service offered to the net
 428  *      and the forwarding entries
 429  */
 430 struct ip_vs_service {
 431         struct list_head        s_list;   /* for normal service table */
 432         struct list_head        f_list;   /* for fwmark-based service table */
 433         atomic_t                refcnt;   /* reference counter */
 434         atomic_t                usecnt;   /* use counter */
 435
 436         u16                     af;       /* address family */
 437         __u16                   protocol; /* which protocol (TCP/UDP) */
 438         union nf_inet_addr      addr;     /* IP address for virtual service */
 439         __be16                  port;     /* port number for the service */
 440         __u32                   fwmark;   /* firewall mark of the service */
 441         unsigned                flags;    /* service status flags */
 442         unsigned                timeout;  /* persistent timeout in ticks */
 443         __be32                  netmask;  /* grouping granularity */
 444
 445         struct list_head        destinations;  /* real server d-linked list */
 446         __u32                   num_dests;     /* number of servers */
 447         struct ip_vs_stats      stats;         /* statistics for the service */
 448         struct ip_vs_app        *inc;     /* bind conns to this app inc */
 449
 450         /* for scheduling */
 451         struct ip_vs_scheduler  *scheduler;    /* bound scheduler object */
 452         rwlock_t                sched_lock;    /* lock sched_data */
 453         void                    *sched_data;   /* scheduler application data */
 454 };
 455
 456
 457 /*
 458  *      The real server destination forwarding entry
 459  *      with ip address, port number, and so on.
 460  */
 461 struct ip_vs_dest {
 462         struct list_head        n_list;   /* for the dests in the service */
 463         struct list_head        d_list;   /* for table with all the dests */
 464
 465         u16                     af;             /* address family */
 466         union nf_inet_addr      addr;           /* IP address of the server */
 467         __be16                  port;           /* port number of the server */
 468         volatile unsigned       flags;          /* dest status flags */
 469         atomic_t                conn_flags;     /* flags to copy to conn */
 470         atomic_t                weight;         /* server weight */
 471
 472         atomic_t                refcnt;         /* reference counter */
 473         struct ip_vs_stats      stats;          /* statistics */
 474
 475         /* connection counters and thresholds */
 476         atomic_t                activeconns;    /* active connections */
 477         atomic_t                inactconns;     /* inactive connections */
 478         atomic_t                persistconns;   /* persistent connections */
 479         __u32                   u_threshold;    /* upper threshold */
 480         __u32                   l_threshold;    /* lower threshold */
 481
 482         /* for destination cache */
 483         spinlock_t              dst_lock;       /* lock of dst_cache */
 484         struct dst_entry        *dst_cache;     /* destination cache entry */
 485         u32                     dst_rtos;       /* RT_TOS(tos) for dst */
 486
 487         /* for virtual service */
 488         struct ip_vs_service    *svc;           /* service it belongs to */
 489         __u16                   protocol;       /* which protocol (TCP/UDP) */
 490         union nf_inet_addr      vaddr;          /* virtual IP address */
 491         __be16                  vport;          /* virtual port number */
 492         __u32                   vfwmark;        /* firewall mark of service */
 493 };
 494
 495
 496 /*
 497  *      The scheduler object
 498  */
 499 struct ip_vs_scheduler {
 500         struct list_head        n_list;         /* d-linked list head */
 501         char                    *name;          /* scheduler name */
 502         atomic_t                refcnt;         /* reference counter */
 503         struct module           *module;        /* THIS_MODULE/NULL */
 504
 505         /* scheduler initializing service */
 506         int (*init_service)(struct ip_vs_service *svc);
 507         /* scheduling service finish */
 508         int (*done_service)(struct ip_vs_service *svc);
 509         /* scheduler updating service */
 510         int (*update_service)(struct ip_vs_service *svc);
 511
 512         /* selecting a server from the given service */
 513         struct ip_vs_dest* (*schedule)(struct ip_vs_service *svc,
 514                                        const struct sk_buff *skb);
 515 };
 516
 517
 518 /*
 519  *      The application module object (a.k.a. app incarnation)
 520  */
 521 struct ip_vs_app
 522 {
 523         struct list_head        a_list;         /* member in app list */
 524         int                     type;           /* IP_VS_APP_TYPE_xxx */
 525         char                    *name;          /* application module name */
 526         __u16                   protocol;
 527         struct module           *module;        /* THIS_MODULE/NULL */
 528         struct list_head        incs_list;      /* list of incarnations */
 529
 530         /* members for application incarnations */
 531         struct list_head        p_list;         /* member in proto app list */
 532         struct ip_vs_app        *app;           /* its real application */
 533         __be16                  port;           /* port number in net order */
 534         atomic_t                usecnt;         /* usage counter */
 535
 536         /* output hook: return false if can't linearize. diff set for TCP.  */
 537         int (*pkt_out)(struct ip_vs_app *, struct ip_vs_conn *,
 538                        struct sk_buff *, int *diff);
 539
 540         /* input hook: return false if can't linearize. diff set for TCP. */
 541         int (*pkt_in)(struct ip_vs_app *, struct ip_vs_conn *,
 542                       struct sk_buff *, int *diff);
 543
 544         /* ip_vs_app initializer */
 545         int (*init_conn)(struct ip_vs_app *, struct ip_vs_conn *);
 546
 547         /* ip_vs_app finish */
 548         int (*done_conn)(struct ip_vs_app *, struct ip_vs_conn *);
 549
 550
 551         /* not used now */
 552         int (*bind_conn)(struct ip_vs_app *, struct ip_vs_conn *,
 553                          struct ip_vs_protocol *);
 554
 555         void (*unbind_conn)(struct ip_vs_app *, struct ip_vs_conn *);
 556
 557         int *                   timeout_table;
 558         int *                   timeouts;
 559         int                     timeouts_size;
 560
 561         int (*conn_schedule)(struct sk_buff *skb, struct ip_vs_app *app,
 562                              int *verdict, struct ip_vs_conn **cpp);
 563
 564         struct ip_vs_conn *
 565         (*conn_in_get)(const struct sk_buff *skb, struct ip_vs_app *app,
 566                        const struct iphdr *iph, unsigned int proto_off,
 567                        int inverse);
 568
 569         struct ip_vs_conn *
 570         (*conn_out_get)(const struct sk_buff *skb, struct ip_vs_app *app,
 571                         const struct iphdr *iph, unsigned int proto_off,
 572                         int inverse);
 573
 574         int (*state_transition)(struct ip_vs_conn *cp, int direction,
 575                                 const struct sk_buff *skb,
 576                                 struct ip_vs_app *app);
 577
 578         void (*timeout_change)(struct ip_vs_app *app, int flags);
 579 };
 580
 581
 582 /*
 583  *      IPVS core functions
 584  *      (from ip_vs_core.c)
 585  */
 586 extern const char *ip_vs_proto_name(unsigned proto);
 587 extern void ip_vs_init_hash_table(struct list_head *table, int rows);
 588 #define IP_VS_INIT_HASH_TABLE(t) ip_vs_init_hash_table((t), ARRAY_SIZE((t)))
 589
 590 #define IP_VS_APP_TYPE_FTP      1
 591
 592 /*
 593  *     ip_vs_conn handling functions
 594  *     (from ip_vs_conn.c)
 595  */
 596
 597 /*
 598  *     IPVS connection entry hash table
 599  */
 600 #ifndef CONFIG_IP_VS_TAB_BITS
 601 #define CONFIG_IP_VS_TAB_BITS   12
 602 #endif
 603
 604 #define IP_VS_CONN_TAB_BITS     CONFIG_IP_VS_TAB_BITS
 605 #define IP_VS_CONN_TAB_SIZE     (1 << IP_VS_CONN_TAB_BITS)
 606 #define IP_VS_CONN_TAB_MASK     (IP_VS_CONN_TAB_SIZE - 1)
 607
 608 enum {
 609         IP_VS_DIR_INPUT = 0,
 610         IP_VS_DIR_OUTPUT,
 611         IP_VS_DIR_INPUT_ONLY,
 612         IP_VS_DIR_LAST,
 613 };
 614
 615 extern struct ip_vs_conn *ip_vs_conn_in_get
 616 (int af, int protocol, const union nf_inet_addr *s_addr, __be16 s_port,
 617  const union nf_inet_addr *d_addr, __be16 d_port);
 618
 619 extern struct ip_vs_conn *ip_vs_ct_in_get
 620 (int af, int protocol, const union nf_inet_addr *s_addr, __be16 s_port,
 621  const union nf_inet_addr *d_addr, __be16 d_port);
 622
 623 extern struct ip_vs_conn *ip_vs_conn_out_get
 624 (int af, int protocol, const union nf_inet_addr *s_addr, __be16 s_port,
 625  const union nf_inet_addr *d_addr, __be16 d_port);
 626
 627 /* put back the conn without restarting its timer */
 628 static inline void __ip_vs_conn_put(struct ip_vs_conn *cp)
 629 {
 630         atomic_dec(&cp->refcnt);
 631 }
 632 extern void ip_vs_conn_put(struct ip_vs_conn *cp);
 633 extern void ip_vs_conn_fill_cport(struct ip_vs_conn *cp, __be16 cport);
 634
 635 extern struct ip_vs_conn *
 636 ip_vs_conn_new(int af, int proto, const union nf_inet_addr *caddr, __be16 cport,
 637                const union nf_inet_addr *vaddr, __be16 vport,
 638                const union nf_inet_addr *daddr, __be16 dport, unsigned flags,
 639                struct ip_vs_dest *dest);
 640 extern void ip_vs_conn_expire_now(struct ip_vs_conn *cp);
 641
 642 extern const char * ip_vs_state_name(__u16 proto, int state);
 643
 644 extern void ip_vs_tcp_conn_listen(struct ip_vs_conn *cp);
 645 extern int ip_vs_check_template(struct ip_vs_conn *ct);
 646 extern void ip_vs_random_dropentry(void);
 647 extern int ip_vs_conn_init(void);
 648 extern void ip_vs_conn_cleanup(void);
 649
 650 static inline void ip_vs_control_del(struct ip_vs_conn *cp)
 651 {
 652         struct ip_vs_conn *ctl_cp = cp->control;
 653         if (!ctl_cp) {
 654                 IP_VS_ERR_BUF("request control DEL for uncontrolled: "
 655                               "%s:%d to %s:%d\n",
 656                               IP_VS_DBG_ADDR(cp->af, &cp->caddr),
 657                               ntohs(cp->cport),
 658                               IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
 659                               ntohs(cp->vport));
 660
 661                 return;
 662         }
 663
 664         IP_VS_DBG_BUF(7, "DELeting control for: "
 665                       "cp.dst=%s:%d ctl_cp.dst=%s:%d\n",
 666                       IP_VS_DBG_ADDR(cp->af, &cp->caddr),
 667                       ntohs(cp->cport),
 668                       IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr),
 669                       ntohs(ctl_cp->cport));
 670
 671         cp->control = NULL;
 672         if (atomic_read(&ctl_cp->n_control) == 0) {
 673                 IP_VS_ERR_BUF("BUG control DEL with n=0 : "
 674                               "%s:%d to %s:%d\n",
 675                               IP_VS_DBG_ADDR(cp->af, &cp->caddr),
 676                               ntohs(cp->cport),
 677                               IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
 678                               ntohs(cp->vport));
 679
 680                 return;
 681         }
 682         atomic_dec(&ctl_cp->n_control);
 683 }
 684
 685 static inline void
 686 ip_vs_control_add(struct ip_vs_conn *cp, struct ip_vs_conn *ctl_cp)
 687 {
 688         if (cp->control) {
 689                 IP_VS_ERR_BUF("request control ADD for already controlled: "
 690                               "%s:%d to %s:%d\n",
 691                               IP_VS_DBG_ADDR(cp->af, &cp->caddr),
 692                               ntohs(cp->cport),
 693                               IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
 694                               ntohs(cp->vport));
 695
 696                 ip_vs_control_del(cp);
 697         }
 698
 699         IP_VS_DBG_BUF(7, "ADDing control for: "
 700                       "cp.dst=%s:%d ctl_cp.dst=%s:%d\n",
 701                       IP_VS_DBG_ADDR(cp->af, &cp->caddr),
 702                       ntohs(cp->cport),
 703                       IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr),
 704                       ntohs(ctl_cp->cport));
 705
 706         cp->control = ctl_cp;
 707         atomic_inc(&ctl_cp->n_control);
 708 }
 709
 710
 711 /*
 712  *      IPVS application functions
 713  *      (from ip_vs_app.c)
 714  */
 715 #define IP_VS_APP_MAX_PORTS  8
 716 extern int register_ip_vs_app(struct ip_vs_app *app);
 717 extern void unregister_ip_vs_app(struct ip_vs_app *app);
 718 extern int ip_vs_bind_app(struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
 719 extern void ip_vs_unbind_app(struct ip_vs_conn *cp);
 720 extern int
 721 register_ip_vs_app_inc(struct ip_vs_app *app, __u16 proto, __u16 port);
 722 extern int ip_vs_app_inc_get(struct ip_vs_app *inc);
 723 extern void ip_vs_app_inc_put(struct ip_vs_app *inc);
 724
 725 extern int ip_vs_app_pkt_out(struct ip_vs_conn *, struct sk_buff *skb);
 726 extern int ip_vs_app_pkt_in(struct ip_vs_conn *, struct sk_buff *skb);
 727 extern int ip_vs_skb_replace(struct sk_buff *skb, gfp_t pri,
 728                              char *o_buf, int o_len, char *n_buf, int n_len);
 729 extern int ip_vs_app_init(void);
 730 extern void ip_vs_app_cleanup(void);
 731
 732
 733 /*
 734  *      IPVS protocol functions (from ip_vs_proto.c)
 735  */
 736 extern int ip_vs_protocol_init(void);
 737 extern void ip_vs_protocol_cleanup(void);
 738 extern void ip_vs_protocol_timeout_change(int flags);
 739 extern int *ip_vs_create_timeout_table(int *table, int size);
 740 extern int
 741 ip_vs_set_state_timeout(int *table, int num, const char *const *names,
 742                         const char *name, int to);
 743 extern void
 744 ip_vs_tcpudp_debug_packet(struct ip_vs_protocol *pp, const struct sk_buff *skb,
 745                           int offset, const char *msg);
 746
 747 extern struct ip_vs_protocol ip_vs_protocol_tcp;
 748 extern struct ip_vs_protocol ip_vs_protocol_udp;
 749 extern struct ip_vs_protocol ip_vs_protocol_icmp;
 750 extern struct ip_vs_protocol ip_vs_protocol_esp;
 751 extern struct ip_vs_protocol ip_vs_protocol_ah;
 752
 753
 754 /*
 755  *      Registering/unregistering scheduler functions
 756  *      (from ip_vs_sched.c)
 757  */
 758 extern int register_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
 759 extern int unregister_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
 760 extern int ip_vs_bind_scheduler(struct ip_vs_service *svc,
 761                                 struct ip_vs_scheduler *scheduler);
 762 extern int ip_vs_unbind_scheduler(struct ip_vs_service *svc);
 763 extern struct ip_vs_scheduler *ip_vs_scheduler_get(const char *sched_name);
 764 extern void ip_vs_scheduler_put(struct ip_vs_scheduler *scheduler);
 765 extern struct ip_vs_conn *
 766 ip_vs_schedule(struct ip_vs_service *svc, const struct sk_buff *skb);
 767 extern int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb,
 768                         struct ip_vs_protocol *pp);
 769
 770
 771 /*
 772  *      IPVS control data and functions (from ip_vs_ctl.c)
 773  */
 774 extern int sysctl_ip_vs_cache_bypass;
 775 extern int sysctl_ip_vs_expire_nodest_conn;
 776 extern int sysctl_ip_vs_expire_quiescent_template;
 777 extern int sysctl_ip_vs_sync_threshold[2];
 778 extern int sysctl_ip_vs_nat_icmp_send;
 779 extern struct ip_vs_stats ip_vs_stats;
 780 extern const struct ctl_path net_vs_ctl_path[];
 781
 782 extern struct ip_vs_service *
 783 ip_vs_service_get(int af, __u32 fwmark, __u16 protocol,
 784                   const union nf_inet_addr *vaddr, __be16 vport);
 785
 786 static inline void ip_vs_service_put(struct ip_vs_service *svc)
 787 {
 788         atomic_dec(&svc->usecnt);
 789 }
 790
 791 extern struct ip_vs_dest *
 792 ip_vs_lookup_real_service(int af, __u16 protocol,
 793                           const union nf_inet_addr *daddr, __be16 dport);
 794
 795 extern int ip_vs_use_count_inc(void);
 796 extern void ip_vs_use_count_dec(void);
 797 extern int ip_vs_control_init(void);
 798 extern void ip_vs_control_cleanup(void);
 799 extern struct ip_vs_dest *
 800 ip_vs_find_dest(int af, const union nf_inet_addr *daddr, __be16 dport,
 801                 const union nf_inet_addr *vaddr, __be16 vport, __u16 protocol);
 802 extern struct ip_vs_dest *ip_vs_try_bind_dest(struct ip_vs_conn *cp);
 803
 804
 805 /*
 806  *      IPVS sync daemon data and function prototypes
 807  *      (from ip_vs_sync.c)
 808  */
 809 extern volatile int ip_vs_sync_state;
 810 extern volatile int ip_vs_master_syncid;
 811 extern volatile int ip_vs_backup_syncid;
 812 extern char ip_vs_master_mcast_ifn[IP_VS_IFNAME_MAXLEN];
 813 extern char ip_vs_backup_mcast_ifn[IP_VS_IFNAME_MAXLEN];
 814 extern int start_sync_thread(int state, char *mcast_ifn, __u8 syncid);
 815 extern int stop_sync_thread(int state);
 816 extern void ip_vs_sync_conn(struct ip_vs_conn *cp);
 817
 818
 819 /*
 820  *      IPVS rate estimator prototypes (from ip_vs_est.c)
 821  */
 822 extern int ip_vs_estimator_init(void);
 823 extern void ip_vs_estimator_cleanup(void);
 824 extern void ip_vs_new_estimator(struct ip_vs_stats *stats);
 825 extern void ip_vs_kill_estimator(struct ip_vs_stats *stats);
 826 extern void ip_vs_zero_estimator(struct ip_vs_stats *stats);
 827
 828 /*
 829  *      Various IPVS packet transmitters (from ip_vs_xmit.c)
 830  */
 831 extern int ip_vs_null_xmit
 832 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
 833 extern int ip_vs_bypass_xmit
 834 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
 835 extern int ip_vs_nat_xmit
 836 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
 837 extern int ip_vs_tunnel_xmit
 838 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
 839 extern int ip_vs_dr_xmit
 840 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
 841 extern int ip_vs_icmp_xmit
 842 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp, int offset);
 843 extern void ip_vs_dst_reset(struct ip_vs_dest *dest);
 844
 845 #ifdef CONFIG_IP_VS_IPV6
 846 extern int ip_vs_bypass_xmit_v6
 847 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
 848 extern int ip_vs_nat_xmit_v6
 849 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
 850 extern int ip_vs_tunnel_xmit_v6
 851 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
 852 extern int ip_vs_dr_xmit_v6
 853 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
 854 extern int ip_vs_icmp_xmit_v6
 855 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp,
 856  int offset);
 857 #endif
 858
 859 /*
 860  *      This is a simple mechanism to ignore packets when
 861  *      we are loaded. Just set ip_vs_drop_rate to 'n' and
 862  *      we start to drop 1/rate of the packets
 863  */
 864 extern int ip_vs_drop_rate;
 865 extern int ip_vs_drop_counter;
 866
 867 static __inline__ int ip_vs_todrop(void)
 868 {
 869         if (!ip_vs_drop_rate) return 0;
 870         if (--ip_vs_drop_counter > 0) return 0;
 871         ip_vs_drop_counter = ip_vs_drop_rate;
 872         return 1;
 873 }
 874
 875 /*
 876  *      ip_vs_fwd_tag returns the forwarding tag of the connection
 877  */
 878 #define IP_VS_FWD_METHOD(cp)  (cp->flags & IP_VS_CONN_F_FWD_MASK)
 879
 880 static inline char ip_vs_fwd_tag(struct ip_vs_conn *cp)
 881 {
 882         char fwd;
 883
 884         switch (IP_VS_FWD_METHOD(cp)) {
 885         case IP_VS_CONN_F_MASQ:
 886                 fwd = 'M'; break;
 887         case IP_VS_CONN_F_LOCALNODE:
 888                 fwd = 'L'; break;
 889         case IP_VS_CONN_F_TUNNEL:
 890                 fwd = 'T'; break;
 891         case IP_VS_CONN_F_DROUTE:
 892                 fwd = 'R'; break;
 893         case IP_VS_CONN_F_BYPASS:
 894                 fwd = 'B'; break;
 895         default:
 896                 fwd = '?'; break;
 897         }
 898         return fwd;
 899 }
 900
 901 extern void ip_vs_nat_icmp(struct sk_buff *skb, struct ip_vs_protocol *pp,
 902                            struct ip_vs_conn *cp, int dir);
 903
 904 #ifdef CONFIG_IP_VS_IPV6
 905 extern void ip_vs_nat_icmp_v6(struct sk_buff *skb, struct ip_vs_protocol *pp,
 906                               struct ip_vs_conn *cp, int dir);
 907 #endif
 908
 909 extern __sum16 ip_vs_checksum_complete(struct sk_buff *skb, int offset);
 910
 911 static inline __wsum ip_vs_check_diff4(__be32 old, __be32 new, __wsum oldsum)
 912 {
 913         __be32 diff[2] = { ~old, new };
 914
 915         return csum_partial(diff, sizeof(diff), oldsum);
 916 }
 917
 918 #ifdef CONFIG_IP_VS_IPV6
 919 static inline __wsum ip_vs_check_diff16(const __be32 *old, const __be32 *new,
 920                                         __wsum oldsum)
 921 {
 922         __be32 diff[8] = { ~old[3], ~old[2], ~old[1], ~old[0],
 923                             new[3],  new[2],  new[1],  new[0] };
 924
 925         return csum_partial(diff, sizeof(diff), oldsum);
 926 }
 927 #endif
 928
 929 static inline __wsum ip_vs_check_diff2(__be16 old, __be16 new, __wsum oldsum)
 930 {
 931         __be16 diff[2] = { ~old, new };
 932
 933         return csum_partial(diff, sizeof(diff), oldsum);
 934 }
 935
 936 #endif /* __KERNEL__ */
 937
 938 #endif  /* _NET_IP_VS_H */