include/net/ip_vs.h

   1 /*
   2  *      IP Virtual Server
   3  *      data structure and functionality definitions
   4  */
   5
   6 #ifndef _IP_VS_H
   7 #define _IP_VS_H
   8
   9 #include <asm/types.h>          /* For __uXX types */
  10 #include <linux/types.h>        /* For __beXX types in userland */
  11
  12 #define IP_VS_VERSION_CODE      0x010201
  13 #define NVERSION(version)                       \
  14         (version >> 16) & 0xFF,                 \
  15         (version >> 8) & 0xFF,                  \
  16         version & 0xFF
  17
  18 /*
  19  *      Virtual Service Flags
  20  */
  21 #define IP_VS_SVC_F_PERSISTENT  0x0001          /* persistent port */
  22 #define IP_VS_SVC_F_HASHED      0x0002          /* hashed entry */
  23
  24 /*
  25  *      Destination Server Flags
  26  */
  27 #define IP_VS_DEST_F_AVAILABLE  0x0001          /* server is available */
  28 #define IP_VS_DEST_F_OVERLOAD   0x0002          /* server is overloaded */
  29
  30 /*
  31  *      IPVS sync daemon states
  32  */
  33 #define IP_VS_STATE_NONE        0x0000          /* daemon is stopped */
  34 #define IP_VS_STATE_MASTER      0x0001          /* started as master */
  35 #define IP_VS_STATE_BACKUP      0x0002          /* started as backup */
  36
  37 /*
  38  *      IPVS socket options
  39  */
  40 #define IP_VS_BASE_CTL          (64+1024+64)            /* base */
  41
  42 #define IP_VS_SO_SET_NONE       IP_VS_BASE_CTL          /* just peek */
  43 #define IP_VS_SO_SET_INSERT     (IP_VS_BASE_CTL+1)
  44 #define IP_VS_SO_SET_ADD        (IP_VS_BASE_CTL+2)
  45 #define IP_VS_SO_SET_EDIT       (IP_VS_BASE_CTL+3)
  46 #define IP_VS_SO_SET_DEL        (IP_VS_BASE_CTL+4)
  47 #define IP_VS_SO_SET_FLUSH      (IP_VS_BASE_CTL+5)
  48 #define IP_VS_SO_SET_LIST       (IP_VS_BASE_CTL+6)
  49 #define IP_VS_SO_SET_ADDDEST    (IP_VS_BASE_CTL+7)
  50 #define IP_VS_SO_SET_DELDEST    (IP_VS_BASE_CTL+8)
  51 #define IP_VS_SO_SET_EDITDEST   (IP_VS_BASE_CTL+9)
  52 #define IP_VS_SO_SET_TIMEOUT    (IP_VS_BASE_CTL+10)
  53 #define IP_VS_SO_SET_STARTDAEMON (IP_VS_BASE_CTL+11)
  54 #define IP_VS_SO_SET_STOPDAEMON (IP_VS_BASE_CTL+12)
  55 #define IP_VS_SO_SET_RESTORE    (IP_VS_BASE_CTL+13)
  56 #define IP_VS_SO_SET_SAVE       (IP_VS_BASE_CTL+14)
  57 #define IP_VS_SO_SET_ZERO       (IP_VS_BASE_CTL+15)
  58 #define IP_VS_SO_SET_MAX        IP_VS_SO_SET_ZERO
  59
  60 #define IP_VS_SO_GET_VERSION    IP_VS_BASE_CTL
  61 #define IP_VS_SO_GET_INFO       (IP_VS_BASE_CTL+1)
  62 #define IP_VS_SO_GET_SERVICES   (IP_VS_BASE_CTL+2)
  63 #define IP_VS_SO_GET_SERVICE    (IP_VS_BASE_CTL+3)
  64 #define IP_VS_SO_GET_DESTS      (IP_VS_BASE_CTL+4)
  65 #define IP_VS_SO_GET_DEST       (IP_VS_BASE_CTL+5)      /* not used now */
  66 #define IP_VS_SO_GET_TIMEOUT    (IP_VS_BASE_CTL+6)
  67 #define IP_VS_SO_GET_DAEMON     (IP_VS_BASE_CTL+7)
  68 #define IP_VS_SO_GET_MAX        IP_VS_SO_GET_DAEMON
  69
  70
  71 /*
  72  *      IPVS Connection Flags
  73  */
  74 #define IP_VS_CONN_F_FWD_MASK   0x0007          /* mask for the fwd methods */
  75 #define IP_VS_CONN_F_MASQ       0x0000          /* masquerading/NAT */
  76 #define IP_VS_CONN_F_LOCALNODE  0x0001          /* local node */
  77 #define IP_VS_CONN_F_TUNNEL     0x0002          /* tunneling */
  78 #define IP_VS_CONN_F_DROUTE     0x0003          /* direct routing */
  79 #define IP_VS_CONN_F_BYPASS     0x0004          /* cache bypass */
  80 #define IP_VS_CONN_F_SYNC       0x0020          /* entry created by sync */
  81 #define IP_VS_CONN_F_HASHED     0x0040          /* hashed entry */
  82 #define IP_VS_CONN_F_NOOUTPUT   0x0080          /* no output packets */
  83 #define IP_VS_CONN_F_INACTIVE   0x0100          /* not established */
  84 #define IP_VS_CONN_F_OUT_SEQ    0x0200          /* must do output seq adjust */
  85 #define IP_VS_CONN_F_IN_SEQ     0x0400          /* must do input seq adjust */
  86 #define IP_VS_CONN_F_SEQ_MASK   0x0600          /* in/out sequence mask */
  87 #define IP_VS_CONN_F_NO_CPORT   0x0800          /* no client port set yet */
  88 #define IP_VS_CONN_F_TEMPLATE   0x1000          /* template, not connection */
  89
  90 /* Move it to better place one day, for now keep it unique */
  91 #define NFC_IPVS_PROPERTY       0x10000
  92
  93 #define IP_VS_SCHEDNAME_MAXLEN  16
  94 #define IP_VS_IFNAME_MAXLEN     16
  95
  96
  97 /*
  98  *      The struct ip_vs_service_user and struct ip_vs_dest_user are
  99  *      used to set IPVS rules through setsockopt.
 100  */
 101 struct ip_vs_service_user {
 102         /* virtual service addresses */
 103         u_int16_t               protocol;
 104         __be32                  addr;           /* virtual ip address */
 105         __be16                  port;
 106         u_int32_t               fwmark;         /* firwall mark of service */
 107
 108         /* virtual service options */
 109         char                    sched_name[IP_VS_SCHEDNAME_MAXLEN];
 110         unsigned                flags;          /* virtual service flags */
 111         unsigned                timeout;        /* persistent timeout in sec */
 112         __be32                  netmask;        /* persistent netmask */
 113 };
 114
 115
 116 struct ip_vs_dest_user {
 117         /* destination server address */
 118         __be32                  addr;
 119         __be16                  port;
 120
 121         /* real server options */
 122         unsigned                conn_flags;     /* connection flags */
 123         int                     weight;         /* destination weight */
 124
 125         /* thresholds for active connections */
 126         u_int32_t               u_threshold;    /* upper threshold */
 127         u_int32_t               l_threshold;    /* lower threshold */
 128 };
 129
 130
 131 /*
 132  *      IPVS statistics object (for user space)
 133  */
 134 struct ip_vs_stats_user
 135 {
 136         __u32                   conns;          /* connections scheduled */
 137         __u32                   inpkts;         /* incoming packets */
 138         __u32                   outpkts;        /* outgoing packets */
 139         __u64                   inbytes;        /* incoming bytes */
 140         __u64                   outbytes;       /* outgoing bytes */
 141
 142         __u32                   cps;            /* current connection rate */
 143         __u32                   inpps;          /* current in packet rate */
 144         __u32                   outpps;         /* current out packet rate */
 145         __u32                   inbps;          /* current in byte rate */
 146         __u32                   outbps;         /* current out byte rate */
 147 };
 148
 149
 150 /* The argument to IP_VS_SO_GET_INFO */
 151 struct ip_vs_getinfo {
 152         /* version number */
 153         unsigned int            version;
 154
 155         /* size of connection hash table */
 156         unsigned int            size;
 157
 158         /* number of virtual services */
 159         unsigned int            num_services;
 160 };
 161
 162
 163 /* The argument to IP_VS_SO_GET_SERVICE */
 164 struct ip_vs_service_entry {
 165         /* which service: user fills in these */
 166         u_int16_t               protocol;
 167         __be32                  addr;           /* virtual address */
 168         __be16                  port;
 169         u_int32_t               fwmark;         /* firwall mark of service */
 170
 171         /* service options */
 172         char                    sched_name[IP_VS_SCHEDNAME_MAXLEN];
 173         unsigned                flags;          /* virtual service flags */
 174         unsigned                timeout;        /* persistent timeout */
 175         __be32                  netmask;        /* persistent netmask */
 176
 177         /* number of real servers */
 178         unsigned int            num_dests;
 179
 180         /* statistics */
 181         struct ip_vs_stats_user stats;
 182 };
 183
 184
 185 struct ip_vs_dest_entry {
 186         __be32                  addr;           /* destination address */
 187         __be16                  port;
 188         unsigned                conn_flags;     /* connection flags */
 189         int                     weight;         /* destination weight */
 190
 191         u_int32_t               u_threshold;    /* upper threshold */
 192         u_int32_t               l_threshold;    /* lower threshold */
 193
 194         u_int32_t               activeconns;    /* active connections */
 195         u_int32_t               inactconns;     /* inactive connections */
 196         u_int32_t               persistconns;   /* persistent connections */
 197
 198         /* statistics */
 199         struct ip_vs_stats_user stats;
 200 };
 201
 202
 203 /* The argument to IP_VS_SO_GET_DESTS */
 204 struct ip_vs_get_dests {
 205         /* which service: user fills in these */
 206         u_int16_t               protocol;
 207         __be32                  addr;           /* virtual address */
 208         __be16                  port;
 209         u_int32_t               fwmark;         /* firwall mark of service */
 210
 211         /* number of real servers */
 212         unsigned int            num_dests;
 213
 214         /* the real servers */
 215         struct ip_vs_dest_entry entrytable[0];
 216 };
 217
 218
 219 /* The argument to IP_VS_SO_GET_SERVICES */
 220 struct ip_vs_get_services {
 221         /* number of virtual services */
 222         unsigned int            num_services;
 223
 224         /* service table */
 225         struct ip_vs_service_entry entrytable[0];
 226 };
 227
 228
 229 /* The argument to IP_VS_SO_GET_TIMEOUT */
 230 struct ip_vs_timeout_user {
 231         int                     tcp_timeout;
 232         int                     tcp_fin_timeout;
 233         int                     udp_timeout;
 234 };
 235
 236
 237 /* The argument to IP_VS_SO_GET_DAEMON */
 238 struct ip_vs_daemon_user {
 239         /* sync daemon state (master/backup) */
 240         int                     state;
 241
 242         /* multicast interface name */
 243         char                    mcast_ifn[IP_VS_IFNAME_MAXLEN];
 244
 245         /* SyncID we belong to */
 246         int                     syncid;
 247 };
 248
 249
 250 #ifdef __KERNEL__
 251
 252 #include <linux/list.h>                 /* for struct list_head */
 253 #include <linux/spinlock.h>             /* for struct rwlock_t */
 254 #include <asm/atomic.h>                 /* for struct atomic_t */
 255 #include <linux/compiler.h>
 256 #include <linux/timer.h>
 257
 258 #include <net/checksum.h>
 259
 260 #ifdef CONFIG_IP_VS_DEBUG
 261 #include <linux/net.h>
 262
 263 extern int ip_vs_get_debug_level(void);
 264 #define IP_VS_DBG(level, msg...)                        \
 265     do {                                                \
 266             if (level <= ip_vs_get_debug_level())       \
 267                     printk(KERN_DEBUG "IPVS: " msg);    \
 268     } while (0)
 269 #define IP_VS_DBG_RL(msg...)                            \
 270     do {                                                \
 271             if (net_ratelimit())                        \
 272                     printk(KERN_DEBUG "IPVS: " msg);    \
 273     } while (0)
 274 #define IP_VS_DBG_PKT(level, pp, skb, ofs, msg)         \
 275     do {                                                \
 276             if (level <= ip_vs_get_debug_level())       \
 277                 pp->debug_packet(pp, skb, ofs, msg);    \
 278     } while (0)
 279 #define IP_VS_DBG_RL_PKT(level, pp, skb, ofs, msg)      \
 280     do {                                                \
 281             if (level <= ip_vs_get_debug_level() &&     \
 282                 net_ratelimit())                        \
 283                 pp->debug_packet(pp, skb, ofs, msg);    \
 284     } while (0)
 285 #else   /* NO DEBUGGING at ALL */
 286 #define IP_VS_DBG(level, msg...)  do {} while (0)
 287 #define IP_VS_DBG_RL(msg...)  do {} while (0)
 288 #define IP_VS_DBG_PKT(level, pp, skb, ofs, msg)         do {} while (0)
 289 #define IP_VS_DBG_RL_PKT(level, pp, skb, ofs, msg)      do {} while (0)
 290 #endif
 291
 292 #define IP_VS_BUG() BUG()
 293 #define IP_VS_ERR(msg...) printk(KERN_ERR "IPVS: " msg)
 294 #define IP_VS_INFO(msg...) printk(KERN_INFO "IPVS: " msg)
 295 #define IP_VS_WARNING(msg...) \
 296         printk(KERN_WARNING "IPVS: " msg)
 297 #define IP_VS_ERR_RL(msg...)                            \
 298     do {                                                \
 299             if (net_ratelimit())                        \
 300                     printk(KERN_ERR "IPVS: " msg);      \
 301     } while (0)
 302
 303 #ifdef CONFIG_IP_VS_DEBUG
 304 #define EnterFunction(level)                                            \
 305     do {                                                                \
 306             if (level <= ip_vs_get_debug_level())                       \
 307                     printk(KERN_DEBUG "Enter: %s, %s line %i\n",        \
 308                            __FUNCTION__, __FILE__, __LINE__);           \
 309     } while (0)
 310 #define LeaveFunction(level)                                            \
 311     do {                                                                \
 312             if (level <= ip_vs_get_debug_level())                       \
 313                         printk(KERN_DEBUG "Leave: %s, %s line %i\n",    \
 314                                __FUNCTION__, __FILE__, __LINE__);       \
 315     } while (0)
 316 #else
 317 #define EnterFunction(level)   do {} while (0)
 318 #define LeaveFunction(level)   do {} while (0)
 319 #endif
 320
 321 #define IP_VS_WAIT_WHILE(expr)  while (expr) { cpu_relax(); }
 322
 323
 324 /*
 325  *      The port number of FTP service (in network order).
 326  */
 327 #define FTPPORT  __constant_htons(21)
 328 #define FTPDATA  __constant_htons(20)
 329
 330 /*
 331  *      TCP State Values
 332  */
 333 enum {
 334         IP_VS_TCP_S_NONE = 0,
 335         IP_VS_TCP_S_ESTABLISHED,
 336         IP_VS_TCP_S_SYN_SENT,
 337         IP_VS_TCP_S_SYN_RECV,
 338         IP_VS_TCP_S_FIN_WAIT,
 339         IP_VS_TCP_S_TIME_WAIT,
 340         IP_VS_TCP_S_CLOSE,
 341         IP_VS_TCP_S_CLOSE_WAIT,
 342         IP_VS_TCP_S_LAST_ACK,
 343         IP_VS_TCP_S_LISTEN,
 344         IP_VS_TCP_S_SYNACK,
 345         IP_VS_TCP_S_LAST
 346 };
 347
 348 /*
 349  *      UDP State Values
 350  */
 351 enum {
 352         IP_VS_UDP_S_NORMAL,
 353         IP_VS_UDP_S_LAST,
 354 };
 355
 356 /*
 357  *      ICMP State Values
 358  */
 359 enum {
 360         IP_VS_ICMP_S_NORMAL,
 361         IP_VS_ICMP_S_LAST,
 362 };
 363
 364 /*
 365  *      Delta sequence info structure
 366  *      Each ip_vs_conn has 2 (output AND input seq. changes).
 367  *      Only used in the VS/NAT.
 368  */
 369 struct ip_vs_seq {
 370         __u32                   init_seq;       /* Add delta from this seq */
 371         __u32                   delta;          /* Delta in sequence numbers */
 372         __u32                   previous_delta; /* Delta in sequence numbers
 373                                                    before last resized pkt */
 374 };
 375
 376
 377 /*
 378  *      IPVS statistics object
 379  */
 380 struct ip_vs_stats
 381 {
 382         __u32                   conns;          /* connections scheduled */
 383         __u32                   inpkts;         /* incoming packets */
 384         __u32                   outpkts;        /* outgoing packets */
 385         __u64                   inbytes;        /* incoming bytes */
 386         __u64                   outbytes;       /* outgoing bytes */
 387
 388         __u32                   cps;            /* current connection rate */
 389         __u32                   inpps;          /* current in packet rate */
 390         __u32                   outpps;         /* current out packet rate */
 391         __u32                   inbps;          /* current in byte rate */
 392         __u32                   outbps;         /* current out byte rate */
 393
 394         spinlock_t              lock;           /* spin lock */
 395 };
 396
 397 struct dst_entry;
 398 struct iphdr;
 399 struct ip_vs_conn;
 400 struct ip_vs_app;
 401 struct sk_buff;
 402
 403 struct ip_vs_protocol {
 404         struct ip_vs_protocol   *next;
 405         char                    *name;
 406         __u16                   protocol;
 407         int                     dont_defrag;
 408         atomic_t                appcnt;         /* counter of proto app incs */
 409         int                     *timeout_table; /* protocol timeout table */
 410
 411         void (*init)(struct ip_vs_protocol *pp);
 412
 413         void (*exit)(struct ip_vs_protocol *pp);
 414
 415         int (*conn_schedule)(struct sk_buff *skb,
 416                              struct ip_vs_protocol *pp,
 417                              int *verdict, struct ip_vs_conn **cpp);
 418
 419         struct ip_vs_conn *
 420         (*conn_in_get)(const struct sk_buff *skb,
 421                        struct ip_vs_protocol *pp,
 422                        const struct iphdr *iph,
 423                        unsigned int proto_off,
 424                        int inverse);
 425
 426         struct ip_vs_conn *
 427         (*conn_out_get)(const struct sk_buff *skb,
 428                         struct ip_vs_protocol *pp,
 429                         const struct iphdr *iph,
 430                         unsigned int proto_off,
 431                         int inverse);
 432
 433         int (*snat_handler)(struct sk_buff *skb,
 434                             struct ip_vs_protocol *pp, struct ip_vs_conn *cp);
 435
 436         int (*dnat_handler)(struct sk_buff *skb,
 437                             struct ip_vs_protocol *pp, struct ip_vs_conn *cp);
 438
 439         int (*csum_check)(struct sk_buff *skb, struct ip_vs_protocol *pp);
 440
 441         const char *(*state_name)(int state);
 442
 443         int (*state_transition)(struct ip_vs_conn *cp, int direction,
 444                                 const struct sk_buff *skb,
 445                                 struct ip_vs_protocol *pp);
 446
 447         int (*register_app)(struct ip_vs_app *inc);
 448
 449         void (*unregister_app)(struct ip_vs_app *inc);
 450
 451         int (*app_conn_bind)(struct ip_vs_conn *cp);
 452
 453         void (*debug_packet)(struct ip_vs_protocol *pp,
 454                              const struct sk_buff *skb,
 455                              int offset,
 456                              const char *msg);
 457
 458         void (*timeout_change)(struct ip_vs_protocol *pp, int flags);
 459
 460         int (*set_state_timeout)(struct ip_vs_protocol *pp, char *sname, int to);
 461 };
 462
 463 extern struct ip_vs_protocol * ip_vs_proto_get(unsigned short proto);
 464
 465 /*
 466  *      IP_VS structure allocated for each dynamically scheduled connection
 467  */
 468 struct ip_vs_conn {
 469         struct list_head        c_list;         /* hashed list heads */
 470
 471         /* Protocol, addresses and port numbers */
 472         __be32                   caddr;          /* client address */
 473         __be32                   vaddr;          /* virtual address */
 474         __be32                   daddr;          /* destination address */
 475         __be16                   cport;
 476         __be16                   vport;
 477         __be16                   dport;
 478         __u16                   protocol;       /* Which protocol (TCP/UDP) */
 479
 480         /* counter and timer */
 481         atomic_t                refcnt;         /* reference count */
 482         struct timer_list       timer;          /* Expiration timer */
 483         volatile unsigned long  timeout;        /* timeout */
 484
 485         /* Flags and state transition */
 486         spinlock_t              lock;           /* lock for state transition */
 487         volatile __u16          flags;          /* status flags */
 488         volatile __u16          state;          /* state info */
 489         volatile __u16          old_state;      /* old state, to be used for
 490                                                  * state transition triggerd
 491                                                  * synchronization
 492                                                  */
 493
 494         /* Control members */
 495         struct ip_vs_conn       *control;       /* Master control connection */
 496         atomic_t                n_control;      /* Number of controlled ones */
 497         struct ip_vs_dest       *dest;          /* real server */
 498         atomic_t                in_pkts;        /* incoming packet counter */
 499
 500         /* packet transmitter for different forwarding methods.  If it
 501            mangles the packet, it must return NF_DROP or better NF_STOLEN,
 502            otherwise this must be changed to a sk_buff **.
 503          */
 504         int (*packet_xmit)(struct sk_buff *skb, struct ip_vs_conn *cp,
 505                            struct ip_vs_protocol *pp);
 506
 507         /* Note: we can group the following members into a structure,
 508            in order to save more space, and the following members are
 509            only used in VS/NAT anyway */
 510         struct ip_vs_app        *app;           /* bound ip_vs_app object */
 511         void                    *app_data;      /* Application private data */
 512         struct ip_vs_seq        in_seq;         /* incoming seq. struct */
 513         struct ip_vs_seq        out_seq;        /* outgoing seq. struct */
 514 };
 515
 516
 517 /*
 518  *      The information about the virtual service offered to the net
 519  *      and the forwarding entries
 520  */
 521 struct ip_vs_service {
 522         struct list_head        s_list;   /* for normal service table */
 523         struct list_head        f_list;   /* for fwmark-based service table */
 524         atomic_t                refcnt;   /* reference counter */
 525         atomic_t                usecnt;   /* use counter */
 526
 527         __u16                   protocol; /* which protocol (TCP/UDP) */
 528         __be32                  addr;     /* IP address for virtual service */
 529         __be16                  port;     /* port number for the service */
 530         __u32                   fwmark;   /* firewall mark of the service */
 531         unsigned                flags;    /* service status flags */
 532         unsigned                timeout;  /* persistent timeout in ticks */
 533         __be32                  netmask;  /* grouping granularity */
 534
 535         struct list_head        destinations;  /* real server d-linked list */
 536         __u32                   num_dests;     /* number of servers */
 537         struct ip_vs_stats      stats;         /* statistics for the service */
 538         struct ip_vs_app        *inc;     /* bind conns to this app inc */
 539
 540         /* for scheduling */
 541         struct ip_vs_scheduler  *scheduler;    /* bound scheduler object */
 542         rwlock_t                sched_lock;    /* lock sched_data */
 543         void                    *sched_data;   /* scheduler application data */
 544 };
 545
 546
 547 /*
 548  *      The real server destination forwarding entry
 549  *      with ip address, port number, and so on.
 550  */
 551 struct ip_vs_dest {
 552         struct list_head        n_list;   /* for the dests in the service */
 553         struct list_head        d_list;   /* for table with all the dests */
 554
 555         __be32                  addr;           /* IP address of the server */
 556         __be16                  port;           /* port number of the server */
 557         volatile unsigned       flags;          /* dest status flags */
 558         atomic_t                conn_flags;     /* flags to copy to conn */
 559         atomic_t                weight;         /* server weight */
 560
 561         atomic_t                refcnt;         /* reference counter */
 562         struct ip_vs_stats      stats;          /* statistics */
 563
 564         /* connection counters and thresholds */
 565         atomic_t                activeconns;    /* active connections */
 566         atomic_t                inactconns;     /* inactive connections */
 567         atomic_t                persistconns;   /* persistent connections */
 568         __u32                   u_threshold;    /* upper threshold */
 569         __u32                   l_threshold;    /* lower threshold */
 570
 571         /* for destination cache */
 572         spinlock_t              dst_lock;       /* lock of dst_cache */
 573         struct dst_entry        *dst_cache;     /* destination cache entry */
 574         u32                     dst_rtos;       /* RT_TOS(tos) for dst */
 575
 576         /* for virtual service */
 577         struct ip_vs_service    *svc;           /* service it belongs to */
 578         __u16                   protocol;       /* which protocol (TCP/UDP) */
 579         __be32                  vaddr;          /* virtual IP address */
 580         __be16                  vport;          /* virtual port number */
 581         __u32                   vfwmark;        /* firewall mark of service */
 582 };
 583
 584
 585 /*
 586  *      The scheduler object
 587  */
 588 struct ip_vs_scheduler {
 589         struct list_head        n_list;         /* d-linked list head */
 590         char                    *name;          /* scheduler name */
 591         atomic_t                refcnt;         /* reference counter */
 592         struct module           *module;        /* THIS_MODULE/NULL */
 593
 594         /* scheduler initializing service */
 595         int (*init_service)(struct ip_vs_service *svc);
 596         /* scheduling service finish */
 597         int (*done_service)(struct ip_vs_service *svc);
 598         /* scheduler updating service */
 599         int (*update_service)(struct ip_vs_service *svc);
 600
 601         /* selecting a server from the given service */
 602         struct ip_vs_dest* (*schedule)(struct ip_vs_service *svc,
 603                                        const struct sk_buff *skb);
 604 };
 605
 606
 607 /*
 608  *      The application module object (a.k.a. app incarnation)
 609  */
 610 struct ip_vs_app
 611 {
 612         struct list_head        a_list;         /* member in app list */
 613         int                     type;           /* IP_VS_APP_TYPE_xxx */
 614         char                    *name;          /* application module name */
 615         __u16                   protocol;
 616         struct module           *module;        /* THIS_MODULE/NULL */
 617         struct list_head        incs_list;      /* list of incarnations */
 618
 619         /* members for application incarnations */
 620         struct list_head        p_list;         /* member in proto app list */
 621         struct ip_vs_app        *app;           /* its real application */
 622         __be16                  port;           /* port number in net order */
 623         atomic_t                usecnt;         /* usage counter */
 624
 625         /* output hook: return false if can't linearize. diff set for TCP.  */
 626         int (*pkt_out)(struct ip_vs_app *, struct ip_vs_conn *,
 627                        struct sk_buff *, int *diff);
 628
 629         /* input hook: return false if can't linearize. diff set for TCP. */
 630         int (*pkt_in)(struct ip_vs_app *, struct ip_vs_conn *,
 631                       struct sk_buff *, int *diff);
 632
 633         /* ip_vs_app initializer */
 634         int (*init_conn)(struct ip_vs_app *, struct ip_vs_conn *);
 635
 636         /* ip_vs_app finish */
 637         int (*done_conn)(struct ip_vs_app *, struct ip_vs_conn *);
 638
 639
 640         /* not used now */
 641         int (*bind_conn)(struct ip_vs_app *, struct ip_vs_conn *,
 642                          struct ip_vs_protocol *);
 643
 644         void (*unbind_conn)(struct ip_vs_app *, struct ip_vs_conn *);
 645
 646         int *                   timeout_table;
 647         int *                   timeouts;
 648         int                     timeouts_size;
 649
 650         int (*conn_schedule)(struct sk_buff *skb, struct ip_vs_app *app,
 651                              int *verdict, struct ip_vs_conn **cpp);
 652
 653         struct ip_vs_conn *
 654         (*conn_in_get)(const struct sk_buff *skb, struct ip_vs_app *app,
 655                        const struct iphdr *iph, unsigned int proto_off,
 656                        int inverse);
 657
 658         struct ip_vs_conn *
 659         (*conn_out_get)(const struct sk_buff *skb, struct ip_vs_app *app,
 660                         const struct iphdr *iph, unsigned int proto_off,
 661                         int inverse);
 662
 663         int (*state_transition)(struct ip_vs_conn *cp, int direction,
 664                                 const struct sk_buff *skb,
 665                                 struct ip_vs_app *app);
 666
 667         void (*timeout_change)(struct ip_vs_app *app, int flags);
 668 };
 669
 670
 671 /*
 672  *      IPVS core functions
 673  *      (from ip_vs_core.c)
 674  */
 675 extern const char *ip_vs_proto_name(unsigned proto);
 676 extern void ip_vs_init_hash_table(struct list_head *table, int rows);
 677 #define IP_VS_INIT_HASH_TABLE(t) ip_vs_init_hash_table(t, sizeof(t)/sizeof(t[0]))
 678
 679 #define IP_VS_APP_TYPE_UNSPEC   0
 680 #define IP_VS_APP_TYPE_FTP      1
 681
 682 /*
 683  *     ip_vs_conn handling functions
 684  *     (from ip_vs_conn.c)
 685  */
 686
 687 /*
 688  *     IPVS connection entry hash table
 689  */
 690 #ifndef CONFIG_IP_VS_TAB_BITS
 691 #define CONFIG_IP_VS_TAB_BITS   12
 692 #endif
 693 /* make sure that IP_VS_CONN_TAB_BITS is located in [8, 20] */
 694 #if CONFIG_IP_VS_TAB_BITS < 8
 695 #define IP_VS_CONN_TAB_BITS     8
 696 #endif
 697 #if CONFIG_IP_VS_TAB_BITS > 20
 698 #define IP_VS_CONN_TAB_BITS     20
 699 #endif
 700 #if 8 <= CONFIG_IP_VS_TAB_BITS && CONFIG_IP_VS_TAB_BITS <= 20
 701 #define IP_VS_CONN_TAB_BITS     CONFIG_IP_VS_TAB_BITS
 702 #endif
 703 #define IP_VS_CONN_TAB_SIZE     (1 << IP_VS_CONN_TAB_BITS)
 704 #define IP_VS_CONN_TAB_MASK     (IP_VS_CONN_TAB_SIZE - 1)
 705
 706 enum {
 707         IP_VS_DIR_INPUT = 0,
 708         IP_VS_DIR_OUTPUT,
 709         IP_VS_DIR_INPUT_ONLY,
 710         IP_VS_DIR_LAST,
 711 };
 712
 713 extern struct ip_vs_conn *ip_vs_conn_in_get
 714 (int protocol, __be32 s_addr, __be16 s_port, __be32 d_addr, __be16 d_port);
 715 extern struct ip_vs_conn *ip_vs_ct_in_get
 716 (int protocol, __be32 s_addr, __be16 s_port, __be32 d_addr, __be16 d_port);
 717 extern struct ip_vs_conn *ip_vs_conn_out_get
 718 (int protocol, __be32 s_addr, __be16 s_port, __be32 d_addr, __be16 d_port);
 719
 720 /* put back the conn without restarting its timer */
 721 static inline void __ip_vs_conn_put(struct ip_vs_conn *cp)
 722 {
 723         atomic_dec(&cp->refcnt);
 724 }
 725 extern void ip_vs_conn_put(struct ip_vs_conn *cp);
 726 extern void ip_vs_conn_fill_cport(struct ip_vs_conn *cp, __be16 cport);
 727
 728 extern struct ip_vs_conn *
 729 ip_vs_conn_new(int proto, __be32 caddr, __be16 cport, __be32 vaddr, __be16 vport,
 730                __be32 daddr, __be16 dport, unsigned flags,
 731                struct ip_vs_dest *dest);
 732 extern void ip_vs_conn_expire_now(struct ip_vs_conn *cp);
 733
 734 extern const char * ip_vs_state_name(__u16 proto, int state);
 735
 736 extern void ip_vs_tcp_conn_listen(struct ip_vs_conn *cp);
 737 extern int ip_vs_check_template(struct ip_vs_conn *ct);
 738 extern void ip_vs_secure_tcp_set(int on);
 739 extern void ip_vs_random_dropentry(void);
 740 extern int ip_vs_conn_init(void);
 741 extern void ip_vs_conn_cleanup(void);
 742
 743 static inline void ip_vs_control_del(struct ip_vs_conn *cp)
 744 {
 745         struct ip_vs_conn *ctl_cp = cp->control;
 746         if (!ctl_cp) {
 747                 IP_VS_ERR("request control DEL for uncontrolled: "
 748                           "%d.%d.%d.%d:%d to %d.%d.%d.%d:%d\n",
 749                           NIPQUAD(cp->caddr),ntohs(cp->cport),
 750                           NIPQUAD(cp->vaddr),ntohs(cp->vport));
 751                 return;
 752         }
 753
 754         IP_VS_DBG(7, "DELeting control for: "
 755                   "cp.dst=%d.%d.%d.%d:%d ctl_cp.dst=%d.%d.%d.%d:%d\n",
 756                   NIPQUAD(cp->caddr),ntohs(cp->cport),
 757                   NIPQUAD(ctl_cp->caddr),ntohs(ctl_cp->cport));
 758
 759         cp->control = NULL;
 760         if (atomic_read(&ctl_cp->n_control) == 0) {
 761                 IP_VS_ERR("BUG control DEL with n=0 : "
 762                           "%d.%d.%d.%d:%d to %d.%d.%d.%d:%d\n",
 763                           NIPQUAD(cp->caddr),ntohs(cp->cport),
 764                           NIPQUAD(cp->vaddr),ntohs(cp->vport));
 765                 return;
 766         }
 767         atomic_dec(&ctl_cp->n_control);
 768 }
 769
 770 static inline void
 771 ip_vs_control_add(struct ip_vs_conn *cp, struct ip_vs_conn *ctl_cp)
 772 {
 773         if (cp->control) {
 774                 IP_VS_ERR("request control ADD for already controlled: "
 775                           "%d.%d.%d.%d:%d to %d.%d.%d.%d:%d\n",
 776                           NIPQUAD(cp->caddr),ntohs(cp->cport),
 777                           NIPQUAD(cp->vaddr),ntohs(cp->vport));
 778                 ip_vs_control_del(cp);
 779         }
 780
 781         IP_VS_DBG(7, "ADDing control for: "
 782                   "cp.dst=%d.%d.%d.%d:%d ctl_cp.dst=%d.%d.%d.%d:%d\n",
 783                   NIPQUAD(cp->caddr),ntohs(cp->cport),
 784                   NIPQUAD(ctl_cp->caddr),ntohs(ctl_cp->cport));
 785
 786         cp->control = ctl_cp;
 787         atomic_inc(&ctl_cp->n_control);
 788 }
 789
 790
 791 /*
 792  *      IPVS application functions
 793  *      (from ip_vs_app.c)
 794  */
 795 #define IP_VS_APP_MAX_PORTS  8
 796 extern int register_ip_vs_app(struct ip_vs_app *app);
 797 extern void unregister_ip_vs_app(struct ip_vs_app *app);
 798 extern int ip_vs_bind_app(struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
 799 extern void ip_vs_unbind_app(struct ip_vs_conn *cp);
 800 extern int
 801 register_ip_vs_app_inc(struct ip_vs_app *app, __u16 proto, __u16 port);
 802 extern int ip_vs_app_inc_get(struct ip_vs_app *inc);
 803 extern void ip_vs_app_inc_put(struct ip_vs_app *inc);
 804
 805 extern int ip_vs_app_pkt_out(struct ip_vs_conn *, struct sk_buff *skb);
 806 extern int ip_vs_app_pkt_in(struct ip_vs_conn *, struct sk_buff *skb);
 807 extern int ip_vs_skb_replace(struct sk_buff *skb, gfp_t pri,
 808                              char *o_buf, int o_len, char *n_buf, int n_len);
 809 extern int ip_vs_app_init(void);
 810 extern void ip_vs_app_cleanup(void);
 811
 812
 813 /*
 814  *      IPVS protocol functions (from ip_vs_proto.c)
 815  */
 816 extern int ip_vs_protocol_init(void);
 817 extern void ip_vs_protocol_cleanup(void);
 818 extern void ip_vs_protocol_timeout_change(int flags);
 819 extern int *ip_vs_create_timeout_table(int *table, int size);
 820 extern int
 821 ip_vs_set_state_timeout(int *table, int num, char **names, char *name, int to);
 822 extern void
 823 ip_vs_tcpudp_debug_packet(struct ip_vs_protocol *pp, const struct sk_buff *skb,
 824                           int offset, const char *msg);
 825
 826 extern struct ip_vs_protocol ip_vs_protocol_tcp;
 827 extern struct ip_vs_protocol ip_vs_protocol_udp;
 828 extern struct ip_vs_protocol ip_vs_protocol_icmp;
 829 extern struct ip_vs_protocol ip_vs_protocol_esp;
 830 extern struct ip_vs_protocol ip_vs_protocol_ah;
 831
 832
 833 /*
 834  *      Registering/unregistering scheduler functions
 835  *      (from ip_vs_sched.c)
 836  */
 837 extern int register_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
 838 extern int unregister_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
 839 extern int ip_vs_bind_scheduler(struct ip_vs_service *svc,
 840                                 struct ip_vs_scheduler *scheduler);
 841 extern int ip_vs_unbind_scheduler(struct ip_vs_service *svc);
 842 extern struct ip_vs_scheduler *ip_vs_scheduler_get(const char *sched_name);
 843 extern void ip_vs_scheduler_put(struct ip_vs_scheduler *scheduler);
 844 extern struct ip_vs_conn *
 845 ip_vs_schedule(struct ip_vs_service *svc, const struct sk_buff *skb);
 846 extern int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb,
 847                         struct ip_vs_protocol *pp);
 848
 849
 850 /*
 851  *      IPVS control data and functions (from ip_vs_ctl.c)
 852  */
 853 extern int sysctl_ip_vs_cache_bypass;
 854 extern int sysctl_ip_vs_expire_nodest_conn;
 855 extern int sysctl_ip_vs_expire_quiescent_template;
 856 extern int sysctl_ip_vs_sync_threshold[2];
 857 extern int sysctl_ip_vs_nat_icmp_send;
 858 extern struct ip_vs_stats ip_vs_stats;
 859
 860 extern struct ip_vs_service *
 861 ip_vs_service_get(__u32 fwmark, __u16 protocol, __be32 vaddr, __be16 vport);
 862
 863 static inline void ip_vs_service_put(struct ip_vs_service *svc)
 864 {
 865         atomic_dec(&svc->usecnt);
 866 }
 867
 868 extern struct ip_vs_dest *
 869 ip_vs_lookup_real_service(__u16 protocol, __be32 daddr, __be16 dport);
 870 extern int ip_vs_use_count_inc(void);
 871 extern void ip_vs_use_count_dec(void);
 872 extern int ip_vs_control_init(void);
 873 extern void ip_vs_control_cleanup(void);
 874 extern struct ip_vs_dest *
 875 ip_vs_find_dest(__be32 daddr, __be16 dport,
 876                  __be32 vaddr, __be16 vport, __u16 protocol);
 877 extern struct ip_vs_dest *ip_vs_try_bind_dest(struct ip_vs_conn *cp);
 878
 879
 880 /*
 881  *      IPVS sync daemon data and function prototypes
 882  *      (from ip_vs_sync.c)
 883  */
 884 extern volatile int ip_vs_sync_state;
 885 extern volatile int ip_vs_master_syncid;
 886 extern volatile int ip_vs_backup_syncid;
 887 extern char ip_vs_master_mcast_ifn[IP_VS_IFNAME_MAXLEN];
 888 extern char ip_vs_backup_mcast_ifn[IP_VS_IFNAME_MAXLEN];
 889 extern int start_sync_thread(int state, char *mcast_ifn, __u8 syncid);
 890 extern int stop_sync_thread(int state);
 891 extern void ip_vs_sync_conn(struct ip_vs_conn *cp);
 892
 893
 894 /*
 895  *      IPVS rate estimator prototypes (from ip_vs_est.c)
 896  */
 897 extern int ip_vs_new_estimator(struct ip_vs_stats *stats);
 898 extern void ip_vs_kill_estimator(struct ip_vs_stats *stats);
 899 extern void ip_vs_zero_estimator(struct ip_vs_stats *stats);
 900
 901 /*
 902  *      Various IPVS packet transmitters (from ip_vs_xmit.c)
 903  */
 904 extern int ip_vs_null_xmit
 905 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
 906 extern int ip_vs_bypass_xmit
 907 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
 908 extern int ip_vs_nat_xmit
 909 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
 910 extern int ip_vs_tunnel_xmit
 911 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
 912 extern int ip_vs_dr_xmit
 913 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
 914 extern int ip_vs_icmp_xmit
 915 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp, int offset);
 916 extern void ip_vs_dst_reset(struct ip_vs_dest *dest);
 917
 918
 919 /*
 920  *      This is a simple mechanism to ignore packets when
 921  *      we are loaded. Just set ip_vs_drop_rate to 'n' and
 922  *      we start to drop 1/rate of the packets
 923  */
 924 extern int ip_vs_drop_rate;
 925 extern int ip_vs_drop_counter;
 926
 927 static __inline__ int ip_vs_todrop(void)
 928 {
 929         if (!ip_vs_drop_rate) return 0;
 930         if (--ip_vs_drop_counter > 0) return 0;
 931         ip_vs_drop_counter = ip_vs_drop_rate;
 932         return 1;
 933 }
 934
 935 /*
 936  *      ip_vs_fwd_tag returns the forwarding tag of the connection
 937  */
 938 #define IP_VS_FWD_METHOD(cp)  (cp->flags & IP_VS_CONN_F_FWD_MASK)
 939
 940 static inline char ip_vs_fwd_tag(struct ip_vs_conn *cp)
 941 {
 942         char fwd;
 943
 944         switch (IP_VS_FWD_METHOD(cp)) {
 945         case IP_VS_CONN_F_MASQ:
 946                 fwd = 'M'; break;
 947         case IP_VS_CONN_F_LOCALNODE:
 948                 fwd = 'L'; break;
 949         case IP_VS_CONN_F_TUNNEL:
 950                 fwd = 'T'; break;
 951         case IP_VS_CONN_F_DROUTE:
 952                 fwd = 'R'; break;
 953         case IP_VS_CONN_F_BYPASS:
 954                 fwd = 'B'; break;
 955         default:
 956                 fwd = '?'; break;
 957         }
 958         return fwd;
 959 }
 960
 961 extern void ip_vs_nat_icmp(struct sk_buff *skb, struct ip_vs_protocol *pp,
 962                 struct ip_vs_conn *cp, int dir);
 963
 964 extern __sum16 ip_vs_checksum_complete(struct sk_buff *skb, int offset);
 965
 966 static inline __wsum ip_vs_check_diff4(__be32 old, __be32 new, __wsum oldsum)
 967 {
 968         __be32 diff[2] = { ~old, new };
 969
 970         return csum_partial((char *) diff, sizeof(diff), oldsum);
 971 }
 972
 973 static inline __wsum ip_vs_check_diff2(__be16 old, __be16 new, __wsum oldsum)
 974 {
 975         __be16 diff[2] = { ~old, new };
 976
 977         return csum_partial((char *) diff, sizeof(diff), oldsum);
 978 }
 979
 980 #endif /* __KERNEL__ */
 981
 982 #endif  /* _IP_VS_H */