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
  25 #ifdef CONFIG_IP_VS_DEBUG
  26 #include <linux/net.h>
  27
  28 extern int ip_vs_get_debug_level(void);
  29 #define IP_VS_DBG(level, msg...)                        \
  30     do {                                                \
  31             if (level <= ip_vs_get_debug_level())       \
  32                     printk(KERN_DEBUG "IPVS: " msg);    \
  33     } while (0)
  34 #define IP_VS_DBG_RL(msg...)                            \
  35     do {                                                \
  36             if (net_ratelimit())                        \
  37                     printk(KERN_DEBUG "IPVS: " msg);    \
  38     } while (0)
  39 #define IP_VS_DBG_PKT(level, pp, skb, ofs, msg)         \
  40     do {                                                \
  41             if (level <= ip_vs_get_debug_level())       \
  42                 pp->debug_packet(pp, skb, ofs, msg);    \
  43     } while (0)
  44 #define IP_VS_DBG_RL_PKT(level, pp, skb, ofs, msg)      \
  45     do {                                                \
  46             if (level <= ip_vs_get_debug_level() &&     \
  47                 net_ratelimit())                        \
  48                 pp->debug_packet(pp, skb, ofs, msg);    \
  49     } while (0)
  50 #else   /* NO DEBUGGING at ALL */
  51 #define IP_VS_DBG(level, msg...)  do {} while (0)
  52 #define IP_VS_DBG_RL(msg...)  do {} while (0)
  53 #define IP_VS_DBG_PKT(level, pp, skb, ofs, msg)         do {} while (0)
  54 #define IP_VS_DBG_RL_PKT(level, pp, skb, ofs, msg)      do {} while (0)
  55 #endif
  56
  57 #define IP_VS_BUG() BUG()
  58 #define IP_VS_ERR(msg...) printk(KERN_ERR "IPVS: " msg)
  59 #define IP_VS_INFO(msg...) printk(KERN_INFO "IPVS: " msg)
  60 #define IP_VS_WARNING(msg...) \
  61         printk(KERN_WARNING "IPVS: " msg)
  62 #define IP_VS_ERR_RL(msg...)                            \
  63     do {                                                \
  64             if (net_ratelimit())                        \
  65                     printk(KERN_ERR "IPVS: " msg);      \
  66     } while (0)
  67
  68 #ifdef CONFIG_IP_VS_DEBUG
  69 #define EnterFunction(level)                                            \
  70     do {                                                                \
  71             if (level <= ip_vs_get_debug_level())                       \
  72                     printk(KERN_DEBUG "Enter: %s, %s line %i\n",        \
  73                            __FUNCTION__, __FILE__, __LINE__);           \
  74     } while (0)
  75 #define LeaveFunction(level)                                            \
  76     do {                                                                \
  77             if (level <= ip_vs_get_debug_level())                       \
  78                         printk(KERN_DEBUG "Leave: %s, %s line %i\n",    \
  79                                __FUNCTION__, __FILE__, __LINE__);       \
  80     } while (0)
  81 #else
  82 #define EnterFunction(level)   do {} while (0)
  83 #define LeaveFunction(level)   do {} while (0)
  84 #endif
  85
  86 #define IP_VS_WAIT_WHILE(expr)  while (expr) { cpu_relax(); }
  87
  88
  89 /*
  90  *      The port number of FTP service (in network order).
  91  */
  92 #define FTPPORT  __constant_htons(21)
  93 #define FTPDATA  __constant_htons(20)
  94
  95 /*
  96  *      TCP State Values
  97  */
  98 enum {
  99         IP_VS_TCP_S_NONE = 0,
 100         IP_VS_TCP_S_ESTABLISHED,
 101         IP_VS_TCP_S_SYN_SENT,
 102         IP_VS_TCP_S_SYN_RECV,
 103         IP_VS_TCP_S_FIN_WAIT,
 104         IP_VS_TCP_S_TIME_WAIT,
 105         IP_VS_TCP_S_CLOSE,
 106         IP_VS_TCP_S_CLOSE_WAIT,
 107         IP_VS_TCP_S_LAST_ACK,
 108         IP_VS_TCP_S_LISTEN,
 109         IP_VS_TCP_S_SYNACK,
 110         IP_VS_TCP_S_LAST
 111 };
 112
 113 /*
 114  *      UDP State Values
 115  */
 116 enum {
 117         IP_VS_UDP_S_NORMAL,
 118         IP_VS_UDP_S_LAST,
 119 };
 120
 121 /*
 122  *      ICMP State Values
 123  */
 124 enum {
 125         IP_VS_ICMP_S_NORMAL,
 126         IP_VS_ICMP_S_LAST,
 127 };
 128
 129 /*
 130  *      Delta sequence info structure
 131  *      Each ip_vs_conn has 2 (output AND input seq. changes).
 132  *      Only used in the VS/NAT.
 133  */
 134 struct ip_vs_seq {
 135         __u32                   init_seq;       /* Add delta from this seq */
 136         __u32                   delta;          /* Delta in sequence numbers */
 137         __u32                   previous_delta; /* Delta in sequence numbers
 138                                                    before last resized pkt */
 139 };
 140
 141
 142 /*
 143  *      IPVS statistics objects
 144  */
 145 struct ip_vs_estimator {
 146         struct list_head        list;
 147
 148         u64                     last_inbytes;
 149         u64                     last_outbytes;
 150         u32                     last_conns;
 151         u32                     last_inpkts;
 152         u32                     last_outpkts;
 153
 154         u32                     cps;
 155         u32                     inpps;
 156         u32                     outpps;
 157         u32                     inbps;
 158         u32                     outbps;
 159 };
 160
 161 struct ip_vs_stats
 162 {
 163         __u32                   conns;          /* connections scheduled */
 164         __u32                   inpkts;         /* incoming packets */
 165         __u32                   outpkts;        /* outgoing packets */
 166         __u64                   inbytes;        /* incoming bytes */
 167         __u64                   outbytes;       /* outgoing bytes */
 168
 169         __u32                   cps;            /* current connection rate */
 170         __u32                   inpps;          /* current in packet rate */
 171         __u32                   outpps;         /* current out packet rate */
 172         __u32                   inbps;          /* current in byte rate */
 173         __u32                   outbps;         /* current out byte rate */
 174
 175         /*
 176          * Don't add anything before the lock, because we use memcpy() to copy
 177          * the members before the lock to struct ip_vs_stats_user in
 178          * ip_vs_ctl.c.
 179          */
 180
 181         spinlock_t              lock;           /* spin lock */
 182
 183         struct ip_vs_estimator  est;            /* estimator */
 184 };
 185
 186 struct dst_entry;
 187 struct iphdr;
 188 struct ip_vs_conn;
 189 struct ip_vs_app;
 190 struct sk_buff;
 191
 192 struct ip_vs_protocol {
 193         struct ip_vs_protocol   *next;
 194         char                    *name;
 195         u16                     protocol;
 196         u16                     num_states;
 197         int                     dont_defrag;
 198         atomic_t                appcnt;         /* counter of proto app incs */
 199         int                     *timeout_table; /* protocol timeout table */
 200
 201         void (*init)(struct ip_vs_protocol *pp);
 202
 203         void (*exit)(struct ip_vs_protocol *pp);
 204
 205         int (*conn_schedule)(struct sk_buff *skb,
 206                              struct ip_vs_protocol *pp,
 207                              int *verdict, struct ip_vs_conn **cpp);
 208
 209         struct ip_vs_conn *
 210         (*conn_in_get)(const struct sk_buff *skb,
 211                        struct ip_vs_protocol *pp,
 212                        const struct iphdr *iph,
 213                        unsigned int proto_off,
 214                        int inverse);
 215
 216         struct ip_vs_conn *
 217         (*conn_out_get)(const struct sk_buff *skb,
 218                         struct ip_vs_protocol *pp,
 219                         const struct iphdr *iph,
 220                         unsigned int proto_off,
 221                         int inverse);
 222
 223         int (*snat_handler)(struct sk_buff *skb,
 224                             struct ip_vs_protocol *pp, struct ip_vs_conn *cp);
 225
 226         int (*dnat_handler)(struct sk_buff *skb,
 227                             struct ip_vs_protocol *pp, struct ip_vs_conn *cp);
 228
 229         int (*csum_check)(struct sk_buff *skb, struct ip_vs_protocol *pp);
 230
 231         const char *(*state_name)(int state);
 232
 233         int (*state_transition)(struct ip_vs_conn *cp, int direction,
 234                                 const struct sk_buff *skb,
 235                                 struct ip_vs_protocol *pp);
 236
 237         int (*register_app)(struct ip_vs_app *inc);
 238
 239         void (*unregister_app)(struct ip_vs_app *inc);
 240
 241         int (*app_conn_bind)(struct ip_vs_conn *cp);
 242
 243         void (*debug_packet)(struct ip_vs_protocol *pp,
 244                              const struct sk_buff *skb,
 245                              int offset,
 246                              const char *msg);
 247
 248         void (*timeout_change)(struct ip_vs_protocol *pp, int flags);
 249
 250         int (*set_state_timeout)(struct ip_vs_protocol *pp, char *sname, int to);
 251 };
 252
 253 extern struct ip_vs_protocol * ip_vs_proto_get(unsigned short proto);
 254
 255 /*
 256  *      IP_VS structure allocated for each dynamically scheduled connection
 257  */
 258 struct ip_vs_conn {
 259         struct list_head        c_list;         /* hashed list heads */
 260
 261         /* Protocol, addresses and port numbers */
 262         __be32                   caddr;          /* client address */
 263         __be32                   vaddr;          /* virtual address */
 264         __be32                   daddr;          /* destination address */
 265         __be16                   cport;
 266         __be16                   vport;
 267         __be16                   dport;
 268         __u16                   protocol;       /* Which protocol (TCP/UDP) */
 269
 270         /* counter and timer */
 271         atomic_t                refcnt;         /* reference count */
 272         struct timer_list       timer;          /* Expiration timer */
 273         volatile unsigned long  timeout;        /* timeout */
 274
 275         /* Flags and state transition */
 276         spinlock_t              lock;           /* lock for state transition */
 277         volatile __u16          flags;          /* status flags */
 278         volatile __u16          state;          /* state info */
 279         volatile __u16          old_state;      /* old state, to be used for
 280                                                  * state transition triggerd
 281                                                  * synchronization
 282                                                  */
 283
 284         /* Control members */
 285         struct ip_vs_conn       *control;       /* Master control connection */
 286         atomic_t                n_control;      /* Number of controlled ones */
 287         struct ip_vs_dest       *dest;          /* real server */
 288         atomic_t                in_pkts;        /* incoming packet counter */
 289
 290         /* packet transmitter for different forwarding methods.  If it
 291            mangles the packet, it must return NF_DROP or better NF_STOLEN,
 292            otherwise this must be changed to a sk_buff **.
 293          */
 294         int (*packet_xmit)(struct sk_buff *skb, struct ip_vs_conn *cp,
 295                            struct ip_vs_protocol *pp);
 296
 297         /* Note: we can group the following members into a structure,
 298            in order to save more space, and the following members are
 299            only used in VS/NAT anyway */
 300         struct ip_vs_app        *app;           /* bound ip_vs_app object */
 301         void                    *app_data;      /* Application private data */
 302         struct ip_vs_seq        in_seq;         /* incoming seq. struct */
 303         struct ip_vs_seq        out_seq;        /* outgoing seq. struct */
 304 };
 305
 306
 307 /*
 308  *      The information about the virtual service offered to the net
 309  *      and the forwarding entries
 310  */
 311 struct ip_vs_service {
 312         struct list_head        s_list;   /* for normal service table */
 313         struct list_head        f_list;   /* for fwmark-based service table */
 314         atomic_t                refcnt;   /* reference counter */
 315         atomic_t                usecnt;   /* use counter */
 316
 317         __u16                   protocol; /* which protocol (TCP/UDP) */
 318         __be32                  addr;     /* IP address for virtual service */
 319         __be16                  port;     /* port number for the service */
 320         __u32                   fwmark;   /* firewall mark of the service */
 321         unsigned                flags;    /* service status flags */
 322         unsigned                timeout;  /* persistent timeout in ticks */
 323         __be32                  netmask;  /* grouping granularity */
 324
 325         struct list_head        destinations;  /* real server d-linked list */
 326         __u32                   num_dests;     /* number of servers */
 327         struct ip_vs_stats      stats;         /* statistics for the service */
 328         struct ip_vs_app        *inc;     /* bind conns to this app inc */
 329
 330         /* for scheduling */
 331         struct ip_vs_scheduler  *scheduler;    /* bound scheduler object */
 332         rwlock_t                sched_lock;    /* lock sched_data */
 333         void                    *sched_data;   /* scheduler application data */
 334 };
 335
 336
 337 /*
 338  *      The real server destination forwarding entry
 339  *      with ip address, port number, and so on.
 340  */
 341 struct ip_vs_dest {
 342         struct list_head        n_list;   /* for the dests in the service */
 343         struct list_head        d_list;   /* for table with all the dests */
 344
 345         __be32                  addr;           /* IP address of the server */
 346         __be16                  port;           /* port number of the server */
 347         volatile unsigned       flags;          /* dest status flags */
 348         atomic_t                conn_flags;     /* flags to copy to conn */
 349         atomic_t                weight;         /* server weight */
 350
 351         atomic_t                refcnt;         /* reference counter */
 352         struct ip_vs_stats      stats;          /* statistics */
 353
 354         /* connection counters and thresholds */
 355         atomic_t                activeconns;    /* active connections */
 356         atomic_t                inactconns;     /* inactive connections */
 357         atomic_t                persistconns;   /* persistent connections */
 358         __u32                   u_threshold;    /* upper threshold */
 359         __u32                   l_threshold;    /* lower threshold */
 360
 361         /* for destination cache */
 362         spinlock_t              dst_lock;       /* lock of dst_cache */
 363         struct dst_entry        *dst_cache;     /* destination cache entry */
 364         u32                     dst_rtos;       /* RT_TOS(tos) for dst */
 365
 366         /* for virtual service */
 367         struct ip_vs_service    *svc;           /* service it belongs to */
 368         __u16                   protocol;       /* which protocol (TCP/UDP) */
 369         __be32                  vaddr;          /* virtual IP address */
 370         __be16                  vport;          /* virtual port number */
 371         __u32                   vfwmark;        /* firewall mark of service */
 372 };
 373
 374
 375 /*
 376  *      The scheduler object
 377  */
 378 struct ip_vs_scheduler {
 379         struct list_head        n_list;         /* d-linked list head */
 380         char                    *name;          /* scheduler name */
 381         atomic_t                refcnt;         /* reference counter */
 382         struct module           *module;        /* THIS_MODULE/NULL */
 383
 384         /* scheduler initializing service */
 385         int (*init_service)(struct ip_vs_service *svc);
 386         /* scheduling service finish */
 387         int (*done_service)(struct ip_vs_service *svc);
 388         /* scheduler updating service */
 389         int (*update_service)(struct ip_vs_service *svc);
 390
 391         /* selecting a server from the given service */
 392         struct ip_vs_dest* (*schedule)(struct ip_vs_service *svc,
 393                                        const struct sk_buff *skb);
 394 };
 395
 396
 397 /*
 398  *      The application module object (a.k.a. app incarnation)
 399  */
 400 struct ip_vs_app
 401 {
 402         struct list_head        a_list;         /* member in app list */
 403         int                     type;           /* IP_VS_APP_TYPE_xxx */
 404         char                    *name;          /* application module name */
 405         __u16                   protocol;
 406         struct module           *module;        /* THIS_MODULE/NULL */
 407         struct list_head        incs_list;      /* list of incarnations */
 408
 409         /* members for application incarnations */
 410         struct list_head        p_list;         /* member in proto app list */
 411         struct ip_vs_app        *app;           /* its real application */
 412         __be16                  port;           /* port number in net order */
 413         atomic_t                usecnt;         /* usage counter */
 414
 415         /* output hook: return false if can't linearize. diff set for TCP.  */
 416         int (*pkt_out)(struct ip_vs_app *, struct ip_vs_conn *,
 417                        struct sk_buff *, int *diff);
 418
 419         /* input hook: return false if can't linearize. diff set for TCP. */
 420         int (*pkt_in)(struct ip_vs_app *, struct ip_vs_conn *,
 421                       struct sk_buff *, int *diff);
 422
 423         /* ip_vs_app initializer */
 424         int (*init_conn)(struct ip_vs_app *, struct ip_vs_conn *);
 425
 426         /* ip_vs_app finish */
 427         int (*done_conn)(struct ip_vs_app *, struct ip_vs_conn *);
 428
 429
 430         /* not used now */
 431         int (*bind_conn)(struct ip_vs_app *, struct ip_vs_conn *,
 432                          struct ip_vs_protocol *);
 433
 434         void (*unbind_conn)(struct ip_vs_app *, struct ip_vs_conn *);
 435
 436         int *                   timeout_table;
 437         int *                   timeouts;
 438         int                     timeouts_size;
 439
 440         int (*conn_schedule)(struct sk_buff *skb, struct ip_vs_app *app,
 441                              int *verdict, struct ip_vs_conn **cpp);
 442
 443         struct ip_vs_conn *
 444         (*conn_in_get)(const struct sk_buff *skb, struct ip_vs_app *app,
 445                        const struct iphdr *iph, unsigned int proto_off,
 446                        int inverse);
 447
 448         struct ip_vs_conn *
 449         (*conn_out_get)(const struct sk_buff *skb, struct ip_vs_app *app,
 450                         const struct iphdr *iph, unsigned int proto_off,
 451                         int inverse);
 452
 453         int (*state_transition)(struct ip_vs_conn *cp, int direction,
 454                                 const struct sk_buff *skb,
 455                                 struct ip_vs_app *app);
 456
 457         void (*timeout_change)(struct ip_vs_app *app, int flags);
 458 };
 459
 460
 461 /*
 462  *      IPVS core functions
 463  *      (from ip_vs_core.c)
 464  */
 465 extern const char *ip_vs_proto_name(unsigned proto);
 466 extern void ip_vs_init_hash_table(struct list_head *table, int rows);
 467 #define IP_VS_INIT_HASH_TABLE(t) ip_vs_init_hash_table((t), ARRAY_SIZE((t)))
 468
 469 #define IP_VS_APP_TYPE_FTP      1
 470
 471 /*
 472  *     ip_vs_conn handling functions
 473  *     (from ip_vs_conn.c)
 474  */
 475
 476 /*
 477  *     IPVS connection entry hash table
 478  */
 479 #ifndef CONFIG_IP_VS_TAB_BITS
 480 #define CONFIG_IP_VS_TAB_BITS   12
 481 #endif
 482 /* make sure that IP_VS_CONN_TAB_BITS is located in [8, 20] */
 483 #if CONFIG_IP_VS_TAB_BITS < 8
 484 #define IP_VS_CONN_TAB_BITS     8
 485 #endif
 486 #if CONFIG_IP_VS_TAB_BITS > 20
 487 #define IP_VS_CONN_TAB_BITS     20
 488 #endif
 489 #if 8 <= CONFIG_IP_VS_TAB_BITS && CONFIG_IP_VS_TAB_BITS <= 20
 490 #define IP_VS_CONN_TAB_BITS     CONFIG_IP_VS_TAB_BITS
 491 #endif
 492 #define IP_VS_CONN_TAB_SIZE     (1 << IP_VS_CONN_TAB_BITS)
 493 #define IP_VS_CONN_TAB_MASK     (IP_VS_CONN_TAB_SIZE - 1)
 494
 495 enum {
 496         IP_VS_DIR_INPUT = 0,
 497         IP_VS_DIR_OUTPUT,
 498         IP_VS_DIR_INPUT_ONLY,
 499         IP_VS_DIR_LAST,
 500 };
 501
 502 extern struct ip_vs_conn *ip_vs_conn_in_get
 503 (int protocol, __be32 s_addr, __be16 s_port, __be32 d_addr, __be16 d_port);
 504 extern struct ip_vs_conn *ip_vs_ct_in_get
 505 (int protocol, __be32 s_addr, __be16 s_port, __be32 d_addr, __be16 d_port);
 506 extern struct ip_vs_conn *ip_vs_conn_out_get
 507 (int protocol, __be32 s_addr, __be16 s_port, __be32 d_addr, __be16 d_port);
 508
 509 /* put back the conn without restarting its timer */
 510 static inline void __ip_vs_conn_put(struct ip_vs_conn *cp)
 511 {
 512         atomic_dec(&cp->refcnt);
 513 }
 514 extern void ip_vs_conn_put(struct ip_vs_conn *cp);
 515 extern void ip_vs_conn_fill_cport(struct ip_vs_conn *cp, __be16 cport);
 516
 517 extern struct ip_vs_conn *
 518 ip_vs_conn_new(int proto, __be32 caddr, __be16 cport, __be32 vaddr, __be16 vport,
 519                __be32 daddr, __be16 dport, unsigned flags,
 520                struct ip_vs_dest *dest);
 521 extern void ip_vs_conn_expire_now(struct ip_vs_conn *cp);
 522
 523 extern const char * ip_vs_state_name(__u16 proto, int state);
 524
 525 extern void ip_vs_tcp_conn_listen(struct ip_vs_conn *cp);
 526 extern int ip_vs_check_template(struct ip_vs_conn *ct);
 527 extern void ip_vs_random_dropentry(void);
 528 extern int ip_vs_conn_init(void);
 529 extern void ip_vs_conn_cleanup(void);
 530
 531 static inline void ip_vs_control_del(struct ip_vs_conn *cp)
 532 {
 533         struct ip_vs_conn *ctl_cp = cp->control;
 534         if (!ctl_cp) {
 535                 IP_VS_ERR("request control DEL for uncontrolled: "
 536                           "%d.%d.%d.%d:%d to %d.%d.%d.%d:%d\n",
 537                           NIPQUAD(cp->caddr),ntohs(cp->cport),
 538                           NIPQUAD(cp->vaddr),ntohs(cp->vport));
 539                 return;
 540         }
 541
 542         IP_VS_DBG(7, "DELeting control for: "
 543                   "cp.dst=%d.%d.%d.%d:%d ctl_cp.dst=%d.%d.%d.%d:%d\n",
 544                   NIPQUAD(cp->caddr),ntohs(cp->cport),
 545                   NIPQUAD(ctl_cp->caddr),ntohs(ctl_cp->cport));
 546
 547         cp->control = NULL;
 548         if (atomic_read(&ctl_cp->n_control) == 0) {
 549                 IP_VS_ERR("BUG control DEL with n=0 : "
 550                           "%d.%d.%d.%d:%d to %d.%d.%d.%d:%d\n",
 551                           NIPQUAD(cp->caddr),ntohs(cp->cport),
 552                           NIPQUAD(cp->vaddr),ntohs(cp->vport));
 553                 return;
 554         }
 555         atomic_dec(&ctl_cp->n_control);
 556 }
 557
 558 static inline void
 559 ip_vs_control_add(struct ip_vs_conn *cp, struct ip_vs_conn *ctl_cp)
 560 {
 561         if (cp->control) {
 562                 IP_VS_ERR("request control ADD for already controlled: "
 563                           "%d.%d.%d.%d:%d to %d.%d.%d.%d:%d\n",
 564                           NIPQUAD(cp->caddr),ntohs(cp->cport),
 565                           NIPQUAD(cp->vaddr),ntohs(cp->vport));
 566                 ip_vs_control_del(cp);
 567         }
 568
 569         IP_VS_DBG(7, "ADDing control for: "
 570                   "cp.dst=%d.%d.%d.%d:%d ctl_cp.dst=%d.%d.%d.%d:%d\n",
 571                   NIPQUAD(cp->caddr),ntohs(cp->cport),
 572                   NIPQUAD(ctl_cp->caddr),ntohs(ctl_cp->cport));
 573
 574         cp->control = ctl_cp;
 575         atomic_inc(&ctl_cp->n_control);
 576 }
 577
 578
 579 /*
 580  *      IPVS application functions
 581  *      (from ip_vs_app.c)
 582  */
 583 #define IP_VS_APP_MAX_PORTS  8
 584 extern int register_ip_vs_app(struct ip_vs_app *app);
 585 extern void unregister_ip_vs_app(struct ip_vs_app *app);
 586 extern int ip_vs_bind_app(struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
 587 extern void ip_vs_unbind_app(struct ip_vs_conn *cp);
 588 extern int
 589 register_ip_vs_app_inc(struct ip_vs_app *app, __u16 proto, __u16 port);
 590 extern int ip_vs_app_inc_get(struct ip_vs_app *inc);
 591 extern void ip_vs_app_inc_put(struct ip_vs_app *inc);
 592
 593 extern int ip_vs_app_pkt_out(struct ip_vs_conn *, struct sk_buff *skb);
 594 extern int ip_vs_app_pkt_in(struct ip_vs_conn *, struct sk_buff *skb);
 595 extern int ip_vs_skb_replace(struct sk_buff *skb, gfp_t pri,
 596                              char *o_buf, int o_len, char *n_buf, int n_len);
 597 extern int ip_vs_app_init(void);
 598 extern void ip_vs_app_cleanup(void);
 599
 600
 601 /*
 602  *      IPVS protocol functions (from ip_vs_proto.c)
 603  */
 604 extern int ip_vs_protocol_init(void);
 605 extern void ip_vs_protocol_cleanup(void);
 606 extern void ip_vs_protocol_timeout_change(int flags);
 607 extern int *ip_vs_create_timeout_table(int *table, int size);
 608 extern int
 609 ip_vs_set_state_timeout(int *table, int num, char **names, char *name, int to);
 610 extern void
 611 ip_vs_tcpudp_debug_packet(struct ip_vs_protocol *pp, const struct sk_buff *skb,
 612                           int offset, const char *msg);
 613
 614 extern struct ip_vs_protocol ip_vs_protocol_tcp;
 615 extern struct ip_vs_protocol ip_vs_protocol_udp;
 616 extern struct ip_vs_protocol ip_vs_protocol_icmp;
 617 extern struct ip_vs_protocol ip_vs_protocol_esp;
 618 extern struct ip_vs_protocol ip_vs_protocol_ah;
 619
 620
 621 /*
 622  *      Registering/unregistering scheduler functions
 623  *      (from ip_vs_sched.c)
 624  */
 625 extern int register_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
 626 extern int unregister_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
 627 extern int ip_vs_bind_scheduler(struct ip_vs_service *svc,
 628                                 struct ip_vs_scheduler *scheduler);
 629 extern int ip_vs_unbind_scheduler(struct ip_vs_service *svc);
 630 extern struct ip_vs_scheduler *ip_vs_scheduler_get(const char *sched_name);
 631 extern void ip_vs_scheduler_put(struct ip_vs_scheduler *scheduler);
 632 extern struct ip_vs_conn *
 633 ip_vs_schedule(struct ip_vs_service *svc, const struct sk_buff *skb);
 634 extern int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb,
 635                         struct ip_vs_protocol *pp);
 636
 637
 638 /*
 639  *      IPVS control data and functions (from ip_vs_ctl.c)
 640  */
 641 extern int sysctl_ip_vs_cache_bypass;
 642 extern int sysctl_ip_vs_expire_nodest_conn;
 643 extern int sysctl_ip_vs_expire_quiescent_template;
 644 extern int sysctl_ip_vs_sync_threshold[2];
 645 extern int sysctl_ip_vs_nat_icmp_send;
 646 extern struct ip_vs_stats ip_vs_stats;
 647 extern const struct ctl_path net_vs_ctl_path[];
 648
 649 extern struct ip_vs_service *
 650 ip_vs_service_get(__u32 fwmark, __u16 protocol, __be32 vaddr, __be16 vport);
 651
 652 static inline void ip_vs_service_put(struct ip_vs_service *svc)
 653 {
 654         atomic_dec(&svc->usecnt);
 655 }
 656
 657 extern struct ip_vs_dest *
 658 ip_vs_lookup_real_service(__u16 protocol, __be32 daddr, __be16 dport);
 659 extern int ip_vs_use_count_inc(void);
 660 extern void ip_vs_use_count_dec(void);
 661 extern int ip_vs_control_init(void);
 662 extern void ip_vs_control_cleanup(void);
 663 extern struct ip_vs_dest *
 664 ip_vs_find_dest(__be32 daddr, __be16 dport,
 665                  __be32 vaddr, __be16 vport, __u16 protocol);
 666 extern struct ip_vs_dest *ip_vs_try_bind_dest(struct ip_vs_conn *cp);
 667
 668
 669 /*
 670  *      IPVS sync daemon data and function prototypes
 671  *      (from ip_vs_sync.c)
 672  */
 673 extern volatile int ip_vs_sync_state;
 674 extern volatile int ip_vs_master_syncid;
 675 extern volatile int ip_vs_backup_syncid;
 676 extern char ip_vs_master_mcast_ifn[IP_VS_IFNAME_MAXLEN];
 677 extern char ip_vs_backup_mcast_ifn[IP_VS_IFNAME_MAXLEN];
 678 extern int start_sync_thread(int state, char *mcast_ifn, __u8 syncid);
 679 extern int stop_sync_thread(int state);
 680 extern void ip_vs_sync_conn(struct ip_vs_conn *cp);
 681
 682
 683 /*
 684  *      IPVS rate estimator prototypes (from ip_vs_est.c)
 685  */
 686 extern void ip_vs_new_estimator(struct ip_vs_stats *stats);
 687 extern void ip_vs_kill_estimator(struct ip_vs_stats *stats);
 688 extern void ip_vs_zero_estimator(struct ip_vs_stats *stats);
 689
 690 /*
 691  *      Various IPVS packet transmitters (from ip_vs_xmit.c)
 692  */
 693 extern int ip_vs_null_xmit
 694 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
 695 extern int ip_vs_bypass_xmit
 696 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
 697 extern int ip_vs_nat_xmit
 698 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
 699 extern int ip_vs_tunnel_xmit
 700 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
 701 extern int ip_vs_dr_xmit
 702 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
 703 extern int ip_vs_icmp_xmit
 704 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp, int offset);
 705 extern void ip_vs_dst_reset(struct ip_vs_dest *dest);
 706
 707
 708 /*
 709  *      This is a simple mechanism to ignore packets when
 710  *      we are loaded. Just set ip_vs_drop_rate to 'n' and
 711  *      we start to drop 1/rate of the packets
 712  */
 713 extern int ip_vs_drop_rate;
 714 extern int ip_vs_drop_counter;
 715
 716 static __inline__ int ip_vs_todrop(void)
 717 {
 718         if (!ip_vs_drop_rate) return 0;
 719         if (--ip_vs_drop_counter > 0) return 0;
 720         ip_vs_drop_counter = ip_vs_drop_rate;
 721         return 1;
 722 }
 723
 724 /*
 725  *      ip_vs_fwd_tag returns the forwarding tag of the connection
 726  */
 727 #define IP_VS_FWD_METHOD(cp)  (cp->flags & IP_VS_CONN_F_FWD_MASK)
 728
 729 static inline char ip_vs_fwd_tag(struct ip_vs_conn *cp)
 730 {
 731         char fwd;
 732
 733         switch (IP_VS_FWD_METHOD(cp)) {
 734         case IP_VS_CONN_F_MASQ:
 735                 fwd = 'M'; break;
 736         case IP_VS_CONN_F_LOCALNODE:
 737                 fwd = 'L'; break;
 738         case IP_VS_CONN_F_TUNNEL:
 739                 fwd = 'T'; break;
 740         case IP_VS_CONN_F_DROUTE:
 741                 fwd = 'R'; break;
 742         case IP_VS_CONN_F_BYPASS:
 743                 fwd = 'B'; break;
 744         default:
 745                 fwd = '?'; break;
 746         }
 747         return fwd;
 748 }
 749
 750 extern void ip_vs_nat_icmp(struct sk_buff *skb, struct ip_vs_protocol *pp,
 751                 struct ip_vs_conn *cp, int dir);
 752
 753 extern __sum16 ip_vs_checksum_complete(struct sk_buff *skb, int offset);
 754
 755 static inline __wsum ip_vs_check_diff4(__be32 old, __be32 new, __wsum oldsum)
 756 {
 757         __be32 diff[2] = { ~old, new };
 758
 759         return csum_partial((char *) diff, sizeof(diff), oldsum);
 760 }
 761
 762 static inline __wsum ip_vs_check_diff2(__be16 old, __be16 new, __wsum oldsum)
 763 {
 764         __be16 diff[2] = { ~old, new };
 765
 766         return csum_partial((char *) diff, sizeof(diff), oldsum);
 767 }
 768
 769 #endif /* __KERNEL__ */
 770
 771 #endif  /* _NET_IP_VS_H */