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