include/net/ip_vs.h

   1 /*
   2  *      IP Virtual Server
   3  *      data structure and functionality definitions
   4  */
   5
   6 #ifndef _NET_IP_VS_H
   7 #define _NET_IP_VS_H
   8
   9 #include <linux/ip_vs.h>                /* definitions shared with userland */
  10
  11 /* old ipvsadm versions still include this file directly */
  12 #ifdef __KERNEL__
  13
  14 #include <asm/types.h>                  /* for __uXX types */
  15
  16 #include <linux/sysctl.h>               /* for ctl_path */
  17 #include <linux/list.h>                 /* for struct list_head */
  18 #include <linux/spinlock.h>             /* for struct rwlock_t */
  19 #include <asm/atomic.h>                 /* for struct atomic_t */
  20 #include <linux/compiler.h>
  21 #include <linux/timer.h>
  22
  23 #include <net/checksum.h>
  24 #include <linux/netfilter.h>            /* for union nf_inet_addr */
  25 #include <linux/ip.h>
  26 #include <linux/ipv6.h>                 /* for struct ipv6hdr */
  27 #include <net/ipv6.h>                   /* for ipv6_addr_copy */
  28
  29 struct ip_vs_iphdr {
  30         int len;
  31         __u8 protocol;
  32         union nf_inet_addr saddr;
  33         union nf_inet_addr daddr;
  34 };
  35
  36 static inline void
  37 ip_vs_fill_iphdr(int af, const void *nh, struct ip_vs_iphdr *iphdr)
  38 {
  39 #ifdef CONFIG_IP_VS_IPV6
  40         if (af == AF_INET6) {
  41                 const struct ipv6hdr *iph = nh;
  42                 iphdr->len = sizeof(struct ipv6hdr);
  43                 iphdr->protocol = iph->nexthdr;
  44                 ipv6_addr_copy(&iphdr->saddr.in6, &iph->saddr);
  45                 ipv6_addr_copy(&iphdr->daddr.in6, &iph->daddr);
  46         } else
  47 #endif
  48         {
  49                 const struct iphdr *iph = nh;
  50                 iphdr->len = iph->ihl * 4;
  51                 iphdr->protocol = iph->protocol;
  52                 iphdr->saddr.ip = iph->saddr;
  53                 iphdr->daddr.ip = iph->daddr;
  54         }
  55 }
  56
  57 static inline void ip_vs_addr_copy(int af, union nf_inet_addr *dst,
  58                                    const union nf_inet_addr *src)
  59 {
  60 #ifdef CONFIG_IP_VS_IPV6
  61         if (af == AF_INET6)
  62                 ipv6_addr_copy(&dst->in6, &src->in6);
  63         else
  64 #endif
  65         dst->ip = src->ip;
  66 }
  67
  68 static inline int ip_vs_addr_equal(int af, const union nf_inet_addr *a,
  69                                    const union nf_inet_addr *b)
  70 {
  71 #ifdef CONFIG_IP_VS_IPV6
  72         if (af == AF_INET6)
  73                 return ipv6_addr_equal(&a->in6, &b->in6);
  74 #endif
  75         return a->ip == b->ip;
  76 }
  77
  78 #ifdef CONFIG_IP_VS_DEBUG
  79 #include <linux/net.h>
  80
  81 extern int ip_vs_get_debug_level(void);
  82
  83 static inline const char *ip_vs_dbg_addr(int af, char *buf, size_t buf_len,
  84                                          const union nf_inet_addr *addr,
  85                                          int *idx)
  86 {
  87         int len;
  88 #ifdef CONFIG_IP_VS_IPV6
  89         if (af == AF_INET6)
  90                 len = snprintf(&buf[*idx], buf_len - *idx, "[%pI6]",
  91                                &addr->in6) + 1;
  92         else
  93 #endif
  94                 len = snprintf(&buf[*idx], buf_len - *idx, "%pI4",
  95                                &addr->ip) + 1;
  96
  97         *idx += len;
  98         BUG_ON(*idx > buf_len + 1);
  99         return &buf[*idx - len];
 100 }
 101
 102 #define IP_VS_DBG_BUF(level, msg, ...)                                  \
 103         do {                                                            \
 104                 char ip_vs_dbg_buf[160];                                \
 105                 int ip_vs_dbg_idx = 0;                                  \
 106                 if (level <= ip_vs_get_debug_level())                   \
 107                         printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__);  \
 108         } while (0)
 109 #define IP_VS_ERR_BUF(msg...)                                           \
 110         do {                                                            \
 111                 char ip_vs_dbg_buf[160];                                \
 112                 int ip_vs_dbg_idx = 0;                                  \
 113                 pr_err(msg);                                            \
 114         } while (0)
 115
 116 /* Only use from within IP_VS_DBG_BUF() or IP_VS_ERR_BUF macros */
 117 #define IP_VS_DBG_ADDR(af, addr)                                        \
 118         ip_vs_dbg_addr(af, ip_vs_dbg_buf,                               \
 119                        sizeof(ip_vs_dbg_buf), addr,                     \
 120                        &ip_vs_dbg_idx)
 121
 122 #define IP_VS_DBG(level, msg, ...)                                      \
 123         do {                                                            \
 124                 if (level <= ip_vs_get_debug_level())                   \
 125                         printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__);  \
 126         } while (0)
 127 #define IP_VS_DBG_RL(msg, ...)                                          \
 128         do {                                                            \
 129                 if (net_ratelimit())                                    \
 130                         printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__);  \
 131         } while (0)
 132 #define IP_VS_DBG_PKT(level, pp, skb, ofs, msg)                         \
 133         do {                                                            \
 134                 if (level <= ip_vs_get_debug_level())                   \
 135                         pp->debug_packet(pp, skb, ofs, msg);            \
 136         } while (0)
 137 #define IP_VS_DBG_RL_PKT(level, pp, skb, ofs, msg)                      \
 138         do {                                                            \
 139                 if (level <= ip_vs_get_debug_level() &&                 \
 140                     net_ratelimit())                                    \
 141                         pp->debug_packet(pp, skb, ofs, msg);            \
 142         } while (0)
 143 #else   /* NO DEBUGGING at ALL */
 144 #define IP_VS_DBG_BUF(level, msg...)  do {} while (0)
 145 #define IP_VS_ERR_BUF(msg...)  do {} while (0)
 146 #define IP_VS_DBG(level, msg...)  do {} while (0)
 147 #define IP_VS_DBG_RL(msg...)  do {} while (0)
 148 #define IP_VS_DBG_PKT(level, pp, skb, ofs, msg)         do {} while (0)
 149 #define IP_VS_DBG_RL_PKT(level, pp, skb, ofs, msg)      do {} while (0)
 150 #endif
 151
 152 #define IP_VS_BUG() BUG()
 153 #define IP_VS_ERR(msg...) pr_err(msg)
 154 #define IP_VS_INFO(msg...) pr_info(msg)
 155 #define IP_VS_WARNING(msg...) pr_warning(msg)
 156 #define IP_VS_ERR_RL(msg...)                                            \
 157         do {                                                            \
 158                 if (net_ratelimit())                                    \
 159                         pr_err(msg);                                    \
 160         } while (0)
 161
 162 #ifdef CONFIG_IP_VS_DEBUG
 163 #define EnterFunction(level)                                            \
 164         do {                                                            \
 165                 if (level <= ip_vs_get_debug_level())                   \
 166                         printk(KERN_DEBUG                               \
 167                                pr_fmt("Enter: %s, %s line %i\n"),       \
 168                                __func__, __FILE__, __LINE__);           \
 169         } while (0)
 170 #define LeaveFunction(level)                                            \
 171         do {                                                            \
 172                 if (level <= ip_vs_get_debug_level())                   \
 173                         printk(KERN_DEBUG                               \
 174                                pr_fmt("Leave: %s, %s line %i\n"),       \
 175                                __func__, __FILE__, __LINE__);           \
 176         } while (0)
 177 #else
 178 #define EnterFunction(level)   do {} while (0)
 179 #define LeaveFunction(level)   do {} while (0)
 180 #endif
 181
 182 #define IP_VS_WAIT_WHILE(expr)  while (expr) { cpu_relax(); }
 183
 184
 185 /*
 186  *      The port number of FTP service (in network order).
 187  */
 188 #define FTPPORT  cpu_to_be16(21)
 189 #define FTPDATA  cpu_to_be16(20)
 190
 191 /*
 192  *      TCP State Values
 193  */
 194 enum {
 195         IP_VS_TCP_S_NONE = 0,
 196         IP_VS_TCP_S_ESTABLISHED,
 197         IP_VS_TCP_S_SYN_SENT,
 198         IP_VS_TCP_S_SYN_RECV,
 199         IP_VS_TCP_S_FIN_WAIT,
 200         IP_VS_TCP_S_TIME_WAIT,
 201         IP_VS_TCP_S_CLOSE,
 202         IP_VS_TCP_S_CLOSE_WAIT,
 203         IP_VS_TCP_S_LAST_ACK,
 204         IP_VS_TCP_S_LISTEN,
 205         IP_VS_TCP_S_SYNACK,
 206         IP_VS_TCP_S_LAST
 207 };
 208
 209 /*
 210  *      UDP State Values
 211  */
 212 enum {
 213         IP_VS_UDP_S_NORMAL,
 214         IP_VS_UDP_S_LAST,
 215 };
 216
 217 /*
 218  *      ICMP State Values
 219  */
 220 enum {
 221         IP_VS_ICMP_S_NORMAL,
 222         IP_VS_ICMP_S_LAST,
 223 };
 224
 225 /*
 226  *      Delta sequence info structure
 227  *      Each ip_vs_conn has 2 (output AND input seq. changes).
 228  *      Only used in the VS/NAT.
 229  */
 230 struct ip_vs_seq {
 231         __u32                   init_seq;       /* Add delta from this seq */
 232         __u32                   delta;          /* Delta in sequence numbers */
 233         __u32                   previous_delta; /* Delta in sequence numbers
 234                                                    before last resized pkt */
 235 };
 236
 237
 238 /*
 239  *      IPVS statistics objects
 240  */
 241 struct ip_vs_estimator {
 242         struct list_head        list;
 243
 244         u64                     last_inbytes;
 245         u64                     last_outbytes;
 246         u32                     last_conns;
 247         u32                     last_inpkts;
 248         u32                     last_outpkts;
 249
 250         u32                     cps;
 251         u32                     inpps;
 252         u32                     outpps;
 253         u32                     inbps;
 254         u32                     outbps;
 255 };
 256
 257 struct ip_vs_stats
 258 {
 259         struct ip_vs_stats_user ustats;         /* statistics */
 260         struct ip_vs_estimator  est;            /* estimator */
 261
 262         spinlock_t              lock;           /* spin lock */
 263 };
 264
 265 struct dst_entry;
 266 struct iphdr;
 267 struct ip_vs_conn;
 268 struct ip_vs_app;
 269 struct sk_buff;
 270
 271 struct ip_vs_protocol {
 272         struct ip_vs_protocol   *next;
 273         char                    *name;
 274         u16                     protocol;
 275         u16                     num_states;
 276         int                     dont_defrag;
 277         atomic_t                appcnt;         /* counter of proto app incs */
 278         int                     *timeout_table; /* protocol timeout table */
 279
 280         void (*init)(struct ip_vs_protocol *pp);
 281
 282         void (*exit)(struct ip_vs_protocol *pp);
 283
 284         int (*conn_schedule)(int af, struct sk_buff *skb,
 285                              struct ip_vs_protocol *pp,
 286                              int *verdict, struct ip_vs_conn **cpp);
 287
 288         struct ip_vs_conn *
 289         (*conn_in_get)(int af,
 290                        const struct sk_buff *skb,
 291                        struct ip_vs_protocol *pp,
 292                        const struct ip_vs_iphdr *iph,
 293                        unsigned int proto_off,
 294                        int inverse);
 295
 296         struct ip_vs_conn *
 297         (*conn_out_get)(int af,
 298                         const struct sk_buff *skb,
 299                         struct ip_vs_protocol *pp,
 300                         const struct ip_vs_iphdr *iph,
 301                         unsigned int proto_off,
 302                         int inverse);
 303
 304         int (*snat_handler)(struct sk_buff *skb,
 305                             struct ip_vs_protocol *pp, struct ip_vs_conn *cp);
 306
 307         int (*dnat_handler)(struct sk_buff *skb,
 308                             struct ip_vs_protocol *pp, struct ip_vs_conn *cp);
 309
 310         int (*csum_check)(int af, struct sk_buff *skb,
 311                           struct ip_vs_protocol *pp);
 312
 313         const char *(*state_name)(int state);
 314
 315         int (*state_transition)(struct ip_vs_conn *cp, int direction,
 316                                 const struct sk_buff *skb,
 317                                 struct ip_vs_protocol *pp);
 318
 319         int (*register_app)(struct ip_vs_app *inc);
 320
 321         void (*unregister_app)(struct ip_vs_app *inc);
 322
 323         int (*app_conn_bind)(struct ip_vs_conn *cp);
 324
 325         void (*debug_packet)(struct ip_vs_protocol *pp,
 326                              const struct sk_buff *skb,
 327                              int offset,
 328                              const char *msg);
 329
 330         void (*timeout_change)(struct ip_vs_protocol *pp, int flags);
 331
 332         int (*set_state_timeout)(struct ip_vs_protocol *pp, char *sname, int to);
 333 };
 334
 335 extern struct ip_vs_protocol * ip_vs_proto_get(unsigned short proto);
 336
 337 /*
 338  *      IP_VS structure allocated for each dynamically scheduled connection
 339  */
 340 struct ip_vs_conn {
 341         struct list_head        c_list;         /* hashed list heads */
 342
 343         /* Protocol, addresses and port numbers */
 344         u16                      af;            /* address family */
 345         union nf_inet_addr       caddr;          /* client address */
 346         union nf_inet_addr       vaddr;          /* virtual address */
 347         union nf_inet_addr       daddr;          /* destination address */
 348         __be16                   cport;
 349         __be16                   vport;
 350         __be16                   dport;
 351         __u16                   protocol;       /* Which protocol (TCP/UDP) */
 352
 353         /* counter and timer */
 354         atomic_t                refcnt;         /* reference count */
 355         struct timer_list       timer;          /* Expiration timer */
 356         volatile unsigned long  timeout;        /* timeout */
 357
 358         /* Flags and state transition */
 359         spinlock_t              lock;           /* lock for state transition */
 360         volatile __u16          flags;          /* status flags */
 361         volatile __u16          state;          /* state info */
 362         volatile __u16          old_state;      /* old state, to be used for
 363                                                  * state transition triggerd
 364                                                  * synchronization
 365                                                  */
 366
 367         /* Control members */
 368         struct ip_vs_conn       *control;       /* Master control connection */
 369         atomic_t                n_control;      /* Number of controlled ones */
 370         struct ip_vs_dest       *dest;          /* real server */
 371         atomic_t                in_pkts;        /* incoming packet counter */
 372
 373         /* packet transmitter for different forwarding methods.  If it
 374            mangles the packet, it must return NF_DROP or better NF_STOLEN,
 375            otherwise this must be changed to a sk_buff **.
 376          */
 377         int (*packet_xmit)(struct sk_buff *skb, struct ip_vs_conn *cp,
 378                            struct ip_vs_protocol *pp);
 379
 380         /* Note: we can group the following members into a structure,
 381            in order to save more space, and the following members are
 382            only used in VS/NAT anyway */
 383         struct ip_vs_app        *app;           /* bound ip_vs_app object */
 384         void                    *app_data;      /* Application private data */
 385         struct ip_vs_seq        in_seq;         /* incoming seq. struct */
 386         struct ip_vs_seq        out_seq;        /* outgoing seq. struct */
 387 };
 388
 389
 390 /*
 391  *      Extended internal versions of struct ip_vs_service_user and
 392  *      ip_vs_dest_user for IPv6 support.
 393  *
 394  *      We need these to conveniently pass around service and destination
 395  *      options, but unfortunately, we also need to keep the old definitions to
 396  *      maintain userspace backwards compatibility for the setsockopt interface.
 397  */
 398 struct ip_vs_service_user_kern {
 399         /* virtual service addresses */
 400         u16                     af;
 401         u16                     protocol;
 402         union nf_inet_addr      addr;           /* virtual ip address */
 403         u16                     port;
 404         u32                     fwmark;         /* firwall mark of service */
 405
 406         /* virtual service options */
 407         char                    *sched_name;
 408         unsigned                flags;          /* virtual service flags */
 409         unsigned                timeout;        /* persistent timeout in sec */
 410         u32                     netmask;        /* persistent netmask */
 411 };
 412
 413
 414 struct ip_vs_dest_user_kern {
 415         /* destination server address */
 416         union nf_inet_addr      addr;
 417         u16                     port;
 418
 419         /* real server options */
 420         unsigned                conn_flags;     /* connection flags */
 421         int                     weight;         /* destination weight */
 422
 423         /* thresholds for active connections */
 424         u32                     u_threshold;    /* upper threshold */
 425         u32                     l_threshold;    /* lower threshold */
 426 };
 427
 428
 429 /*
 430  *      The information about the virtual service offered to the net
 431  *      and the forwarding entries
 432  */
 433 struct ip_vs_service {
 434         struct list_head        s_list;   /* for normal service table */
 435         struct list_head        f_list;   /* for fwmark-based service table */
 436         atomic_t                refcnt;   /* reference counter */
 437         atomic_t                usecnt;   /* use counter */
 438
 439         u16                     af;       /* address family */
 440         __u16                   protocol; /* which protocol (TCP/UDP) */
 441         union nf_inet_addr      addr;     /* IP address for virtual service */
 442         __be16                  port;     /* port number for the service */
 443         __u32                   fwmark;   /* firewall mark of the service */
 444         unsigned                flags;    /* service status flags */
 445         unsigned                timeout;  /* persistent timeout in ticks */
 446         __be32                  netmask;  /* grouping granularity */
 447
 448         struct list_head        destinations;  /* real server d-linked list */
 449         __u32                   num_dests;     /* number of servers */
 450         struct ip_vs_stats      stats;         /* statistics for the service */
 451         struct ip_vs_app        *inc;     /* bind conns to this app inc */
 452
 453         /* for scheduling */
 454         struct ip_vs_scheduler  *scheduler;    /* bound scheduler object */
 455         rwlock_t                sched_lock;    /* lock sched_data */
 456         void                    *sched_data;   /* scheduler application data */
 457 };
 458
 459
 460 /*
 461  *      The real server destination forwarding entry
 462  *      with ip address, port number, and so on.
 463  */
 464 struct ip_vs_dest {
 465         struct list_head        n_list;   /* for the dests in the service */
 466         struct list_head        d_list;   /* for table with all the dests */
 467
 468         u16                     af;             /* address family */
 469         union nf_inet_addr      addr;           /* IP address of the server */
 470         __be16                  port;           /* port number of the server */
 471         volatile unsigned       flags;          /* dest status flags */
 472         atomic_t                conn_flags;     /* flags to copy to conn */
 473         atomic_t                weight;         /* server weight */
 474
 475         atomic_t                refcnt;         /* reference counter */
 476         struct ip_vs_stats      stats;          /* statistics */
 477
 478         /* connection counters and thresholds */
 479         atomic_t                activeconns;    /* active connections */
 480         atomic_t                inactconns;     /* inactive connections */
 481         atomic_t                persistconns;   /* persistent connections */
 482         __u32                   u_threshold;    /* upper threshold */
 483         __u32                   l_threshold;    /* lower threshold */
 484
 485         /* for destination cache */
 486         spinlock_t              dst_lock;       /* lock of dst_cache */
 487         struct dst_entry        *dst_cache;     /* destination cache entry */
 488         u32                     dst_rtos;       /* RT_TOS(tos) for dst */
 489
 490         /* for virtual service */
 491         struct ip_vs_service    *svc;           /* service it belongs to */
 492         __u16                   protocol;       /* which protocol (TCP/UDP) */
 493         union nf_inet_addr      vaddr;          /* virtual IP address */
 494         __be16                  vport;          /* virtual port number */
 495         __u32                   vfwmark;        /* firewall mark of service */
 496 };
 497
 498
 499 /*
 500  *      The scheduler object
 501  */
 502 struct ip_vs_scheduler {
 503         struct list_head        n_list;         /* d-linked list head */
 504         char                    *name;          /* scheduler name */
 505         atomic_t                refcnt;         /* reference counter */
 506         struct module           *module;        /* THIS_MODULE/NULL */
 507
 508         /* scheduler initializing service */
 509         int (*init_service)(struct ip_vs_service *svc);
 510         /* scheduling service finish */
 511         int (*done_service)(struct ip_vs_service *svc);
 512         /* scheduler updating service */
 513         int (*update_service)(struct ip_vs_service *svc);
 514
 515         /* selecting a server from the given service */
 516         struct ip_vs_dest* (*schedule)(struct ip_vs_service *svc,
 517                                        const struct sk_buff *skb);
 518 };
 519
 520
 521 /*
 522  *      The application module object (a.k.a. app incarnation)
 523  */
 524 struct ip_vs_app
 525 {
 526         struct list_head        a_list;         /* member in app list */
 527         int                     type;           /* IP_VS_APP_TYPE_xxx */
 528         char                    *name;          /* application module name */
 529         __u16                   protocol;
 530         struct module           *module;        /* THIS_MODULE/NULL */
 531         struct list_head        incs_list;      /* list of incarnations */
 532
 533         /* members for application incarnations */
 534         struct list_head        p_list;         /* member in proto app list */
 535         struct ip_vs_app        *app;           /* its real application */
 536         __be16                  port;           /* port number in net order */
 537         atomic_t                usecnt;         /* usage counter */
 538
 539         /* output hook: return false if can't linearize. diff set for TCP.  */
 540         int (*pkt_out)(struct ip_vs_app *, struct ip_vs_conn *,
 541                        struct sk_buff *, int *diff);
 542
 543         /* input hook: return false if can't linearize. diff set for TCP. */
 544         int (*pkt_in)(struct ip_vs_app *, struct ip_vs_conn *,
 545                       struct sk_buff *, int *diff);
 546
 547         /* ip_vs_app initializer */
 548         int (*init_conn)(struct ip_vs_app *, struct ip_vs_conn *);
 549
 550         /* ip_vs_app finish */
 551         int (*done_conn)(struct ip_vs_app *, struct ip_vs_conn *);
 552
 553
 554         /* not used now */
 555         int (*bind_conn)(struct ip_vs_app *, struct ip_vs_conn *,
 556                          struct ip_vs_protocol *);
 557
 558         void (*unbind_conn)(struct ip_vs_app *, struct ip_vs_conn *);
 559
 560         int *                   timeout_table;
 561         int *                   timeouts;
 562         int                     timeouts_size;
 563
 564         int (*conn_schedule)(struct sk_buff *skb, struct ip_vs_app *app,
 565                              int *verdict, struct ip_vs_conn **cpp);
 566
 567         struct ip_vs_conn *
 568         (*conn_in_get)(const struct sk_buff *skb, struct ip_vs_app *app,
 569                        const struct iphdr *iph, unsigned int proto_off,
 570                        int inverse);
 571
 572         struct ip_vs_conn *
 573         (*conn_out_get)(const struct sk_buff *skb, struct ip_vs_app *app,
 574                         const struct iphdr *iph, unsigned int proto_off,
 575                         int inverse);
 576
 577         int (*state_transition)(struct ip_vs_conn *cp, int direction,
 578                                 const struct sk_buff *skb,
 579                                 struct ip_vs_app *app);
 580
 581         void (*timeout_change)(struct ip_vs_app *app, int flags);
 582 };
 583
 584
 585 /*
 586  *      IPVS core functions
 587  *      (from ip_vs_core.c)
 588  */
 589 extern const char *ip_vs_proto_name(unsigned proto);
 590 extern void ip_vs_init_hash_table(struct list_head *table, int rows);
 591 #define IP_VS_INIT_HASH_TABLE(t) ip_vs_init_hash_table((t), ARRAY_SIZE((t)))
 592
 593 #define IP_VS_APP_TYPE_FTP      1
 594
 595 /*
 596  *     ip_vs_conn handling functions
 597  *     (from ip_vs_conn.c)
 598  */
 599
 600 /*
 601  *     IPVS connection entry hash table
 602  */
 603 #ifndef CONFIG_IP_VS_TAB_BITS
 604 #define CONFIG_IP_VS_TAB_BITS   12
 605 #endif
 606
 607 #define IP_VS_CONN_TAB_BITS     CONFIG_IP_VS_TAB_BITS
 608 #define IP_VS_CONN_TAB_SIZE     (1 << IP_VS_CONN_TAB_BITS)
 609 #define IP_VS_CONN_TAB_MASK     (IP_VS_CONN_TAB_SIZE - 1)
 610
 611 enum {
 612         IP_VS_DIR_INPUT = 0,
 613         IP_VS_DIR_OUTPUT,
 614         IP_VS_DIR_INPUT_ONLY,
 615         IP_VS_DIR_LAST,
 616 };
 617
 618 extern struct ip_vs_conn *ip_vs_conn_in_get
 619 (int af, int protocol, const union nf_inet_addr *s_addr, __be16 s_port,
 620  const union nf_inet_addr *d_addr, __be16 d_port);
 621
 622 extern struct ip_vs_conn *ip_vs_ct_in_get
 623 (int af, int protocol, const union nf_inet_addr *s_addr, __be16 s_port,
 624  const union nf_inet_addr *d_addr, __be16 d_port);
 625
 626 extern struct ip_vs_conn *ip_vs_conn_out_get
 627 (int af, int protocol, const union nf_inet_addr *s_addr, __be16 s_port,
 628  const union nf_inet_addr *d_addr, __be16 d_port);
 629
 630 /* put back the conn without restarting its timer */
 631 static inline void __ip_vs_conn_put(struct ip_vs_conn *cp)
 632 {
 633         atomic_dec(&cp->refcnt);
 634 }
 635 extern void ip_vs_conn_put(struct ip_vs_conn *cp);
 636 extern void ip_vs_conn_fill_cport(struct ip_vs_conn *cp, __be16 cport);
 637
 638 extern struct ip_vs_conn *
 639 ip_vs_conn_new(int af, int proto, const union nf_inet_addr *caddr, __be16 cport,
 640                const union nf_inet_addr *vaddr, __be16 vport,
 641                const union nf_inet_addr *daddr, __be16 dport, unsigned flags,
 642                struct ip_vs_dest *dest);
 643 extern void ip_vs_conn_expire_now(struct ip_vs_conn *cp);
 644
 645 extern const char * ip_vs_state_name(__u16 proto, int state);
 646
 647 extern void ip_vs_tcp_conn_listen(struct ip_vs_conn *cp);
 648 extern int ip_vs_check_template(struct ip_vs_conn *ct);
 649 extern void ip_vs_random_dropentry(void);
 650 extern int ip_vs_conn_init(void);
 651 extern void ip_vs_conn_cleanup(void);
 652
 653 static inline void ip_vs_control_del(struct ip_vs_conn *cp)
 654 {
 655         struct ip_vs_conn *ctl_cp = cp->control;
 656         if (!ctl_cp) {
 657                 IP_VS_ERR_BUF("request control DEL for uncontrolled: "
 658                               "%s:%d to %s:%d\n",
 659                               IP_VS_DBG_ADDR(cp->af, &cp->caddr),
 660                               ntohs(cp->cport),
 661                               IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
 662                               ntohs(cp->vport));
 663
 664                 return;
 665         }
 666
 667         IP_VS_DBG_BUF(7, "DELeting control for: "
 668                       "cp.dst=%s:%d ctl_cp.dst=%s:%d\n",
 669                       IP_VS_DBG_ADDR(cp->af, &cp->caddr),
 670                       ntohs(cp->cport),
 671                       IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr),
 672                       ntohs(ctl_cp->cport));
 673
 674         cp->control = NULL;
 675         if (atomic_read(&ctl_cp->n_control) == 0) {
 676                 IP_VS_ERR_BUF("BUG control DEL with n=0 : "
 677                               "%s:%d to %s:%d\n",
 678                               IP_VS_DBG_ADDR(cp->af, &cp->caddr),
 679                               ntohs(cp->cport),
 680                               IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
 681                               ntohs(cp->vport));
 682
 683                 return;
 684         }
 685         atomic_dec(&ctl_cp->n_control);
 686 }
 687
 688 static inline void
 689 ip_vs_control_add(struct ip_vs_conn *cp, struct ip_vs_conn *ctl_cp)
 690 {
 691         if (cp->control) {
 692                 IP_VS_ERR_BUF("request control ADD for already controlled: "
 693                               "%s:%d to %s:%d\n",
 694                               IP_VS_DBG_ADDR(cp->af, &cp->caddr),
 695                               ntohs(cp->cport),
 696                               IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
 697                               ntohs(cp->vport));
 698
 699                 ip_vs_control_del(cp);
 700         }
 701
 702         IP_VS_DBG_BUF(7, "ADDing control for: "
 703                       "cp.dst=%s:%d ctl_cp.dst=%s:%d\n",
 704                       IP_VS_DBG_ADDR(cp->af, &cp->caddr),
 705                       ntohs(cp->cport),
 706                       IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr),
 707                       ntohs(ctl_cp->cport));
 708
 709         cp->control = ctl_cp;
 710         atomic_inc(&ctl_cp->n_control);
 711 }
 712
 713
 714 /*
 715  *      IPVS application functions
 716  *      (from ip_vs_app.c)
 717  */
 718 #define IP_VS_APP_MAX_PORTS  8
 719 extern int register_ip_vs_app(struct ip_vs_app *app);
 720 extern void unregister_ip_vs_app(struct ip_vs_app *app);
 721 extern int ip_vs_bind_app(struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
 722 extern void ip_vs_unbind_app(struct ip_vs_conn *cp);
 723 extern int
 724 register_ip_vs_app_inc(struct ip_vs_app *app, __u16 proto, __u16 port);
 725 extern int ip_vs_app_inc_get(struct ip_vs_app *inc);
 726 extern void ip_vs_app_inc_put(struct ip_vs_app *inc);
 727
 728 extern int ip_vs_app_pkt_out(struct ip_vs_conn *, struct sk_buff *skb);
 729 extern int ip_vs_app_pkt_in(struct ip_vs_conn *, struct sk_buff *skb);
 730 extern int ip_vs_skb_replace(struct sk_buff *skb, gfp_t pri,
 731                              char *o_buf, int o_len, char *n_buf, int n_len);
 732 extern int ip_vs_app_init(void);
 733 extern void ip_vs_app_cleanup(void);
 734
 735
 736 /*
 737  *      IPVS protocol functions (from ip_vs_proto.c)
 738  */
 739 extern int ip_vs_protocol_init(void);
 740 extern void ip_vs_protocol_cleanup(void);
 741 extern void ip_vs_protocol_timeout_change(int flags);
 742 extern int *ip_vs_create_timeout_table(int *table, int size);
 743 extern int
 744 ip_vs_set_state_timeout(int *table, int num, char **names, char *name, int to);
 745 extern void
 746 ip_vs_tcpudp_debug_packet(struct ip_vs_protocol *pp, const struct sk_buff *skb,
 747                           int offset, const char *msg);
 748
 749 extern struct ip_vs_protocol ip_vs_protocol_tcp;
 750 extern struct ip_vs_protocol ip_vs_protocol_udp;
 751 extern struct ip_vs_protocol ip_vs_protocol_icmp;
 752 extern struct ip_vs_protocol ip_vs_protocol_esp;
 753 extern struct ip_vs_protocol ip_vs_protocol_ah;
 754
 755
 756 /*
 757  *      Registering/unregistering scheduler functions
 758  *      (from ip_vs_sched.c)
 759  */
 760 extern int register_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
 761 extern int unregister_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
 762 extern int ip_vs_bind_scheduler(struct ip_vs_service *svc,
 763                                 struct ip_vs_scheduler *scheduler);
 764 extern int ip_vs_unbind_scheduler(struct ip_vs_service *svc);
 765 extern struct ip_vs_scheduler *ip_vs_scheduler_get(const char *sched_name);
 766 extern void ip_vs_scheduler_put(struct ip_vs_scheduler *scheduler);
 767 extern struct ip_vs_conn *
 768 ip_vs_schedule(struct ip_vs_service *svc, const struct sk_buff *skb);
 769 extern int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb,
 770                         struct ip_vs_protocol *pp);
 771
 772
 773 /*
 774  *      IPVS control data and functions (from ip_vs_ctl.c)
 775  */
 776 extern int sysctl_ip_vs_cache_bypass;
 777 extern int sysctl_ip_vs_expire_nodest_conn;
 778 extern int sysctl_ip_vs_expire_quiescent_template;
 779 extern int sysctl_ip_vs_sync_threshold[2];
 780 extern int sysctl_ip_vs_nat_icmp_send;
 781 extern struct ip_vs_stats ip_vs_stats;
 782 extern const struct ctl_path net_vs_ctl_path[];
 783
 784 extern struct ip_vs_service *
 785 ip_vs_service_get(int af, __u32 fwmark, __u16 protocol,
 786                   const union nf_inet_addr *vaddr, __be16 vport);
 787
 788 static inline void ip_vs_service_put(struct ip_vs_service *svc)
 789 {
 790         atomic_dec(&svc->usecnt);
 791 }
 792
 793 extern struct ip_vs_dest *
 794 ip_vs_lookup_real_service(int af, __u16 protocol,
 795                           const union nf_inet_addr *daddr, __be16 dport);
 796
 797 extern int ip_vs_use_count_inc(void);
 798 extern void ip_vs_use_count_dec(void);
 799 extern int ip_vs_control_init(void);
 800 extern void ip_vs_control_cleanup(void);
 801 extern struct ip_vs_dest *
 802 ip_vs_find_dest(int af, const union nf_inet_addr *daddr, __be16 dport,
 803                 const union nf_inet_addr *vaddr, __be16 vport, __u16 protocol);
 804 extern struct ip_vs_dest *ip_vs_try_bind_dest(struct ip_vs_conn *cp);
 805
 806
 807 /*
 808  *      IPVS sync daemon data and function prototypes
 809  *      (from ip_vs_sync.c)
 810  */
 811 extern volatile int ip_vs_sync_state;
 812 extern volatile int ip_vs_master_syncid;
 813 extern volatile int ip_vs_backup_syncid;
 814 extern char ip_vs_master_mcast_ifn[IP_VS_IFNAME_MAXLEN];
 815 extern char ip_vs_backup_mcast_ifn[IP_VS_IFNAME_MAXLEN];
 816 extern int start_sync_thread(int state, char *mcast_ifn, __u8 syncid);
 817 extern int stop_sync_thread(int state);
 818 extern void ip_vs_sync_conn(struct ip_vs_conn *cp);
 819
 820
 821 /*
 822  *      IPVS rate estimator prototypes (from ip_vs_est.c)
 823  */
 824 extern int ip_vs_estimator_init(void);
 825 extern void ip_vs_estimator_cleanup(void);
 826 extern void ip_vs_new_estimator(struct ip_vs_stats *stats);
 827 extern void ip_vs_kill_estimator(struct ip_vs_stats *stats);
 828 extern void ip_vs_zero_estimator(struct ip_vs_stats *stats);
 829
 830 /*
 831  *      Various IPVS packet transmitters (from ip_vs_xmit.c)
 832  */
 833 extern int ip_vs_null_xmit
 834 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
 835 extern int ip_vs_bypass_xmit
 836 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
 837 extern int ip_vs_nat_xmit
 838 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
 839 extern int ip_vs_tunnel_xmit
 840 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
 841 extern int ip_vs_dr_xmit
 842 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
 843 extern int ip_vs_icmp_xmit
 844 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp, int offset);
 845 extern void ip_vs_dst_reset(struct ip_vs_dest *dest);
 846
 847 #ifdef CONFIG_IP_VS_IPV6
 848 extern int ip_vs_bypass_xmit_v6
 849 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
 850 extern int ip_vs_nat_xmit_v6
 851 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
 852 extern int ip_vs_tunnel_xmit_v6
 853 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
 854 extern int ip_vs_dr_xmit_v6
 855 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
 856 extern int ip_vs_icmp_xmit_v6
 857 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp,
 858  int offset);
 859 #endif
 860
 861 /*
 862  *      This is a simple mechanism to ignore packets when
 863  *      we are loaded. Just set ip_vs_drop_rate to 'n' and
 864  *      we start to drop 1/rate of the packets
 865  */
 866 extern int ip_vs_drop_rate;
 867 extern int ip_vs_drop_counter;
 868
 869 static __inline__ int ip_vs_todrop(void)
 870 {
 871         if (!ip_vs_drop_rate) return 0;
 872         if (--ip_vs_drop_counter > 0) return 0;
 873         ip_vs_drop_counter = ip_vs_drop_rate;
 874         return 1;
 875 }
 876
 877 /*
 878  *      ip_vs_fwd_tag returns the forwarding tag of the connection
 879  */
 880 #define IP_VS_FWD_METHOD(cp)  (cp->flags & IP_VS_CONN_F_FWD_MASK)
 881
 882 static inline char ip_vs_fwd_tag(struct ip_vs_conn *cp)
 883 {
 884         char fwd;
 885
 886         switch (IP_VS_FWD_METHOD(cp)) {
 887         case IP_VS_CONN_F_MASQ:
 888                 fwd = 'M'; break;
 889         case IP_VS_CONN_F_LOCALNODE:
 890                 fwd = 'L'; break;
 891         case IP_VS_CONN_F_TUNNEL:
 892                 fwd = 'T'; break;
 893         case IP_VS_CONN_F_DROUTE:
 894                 fwd = 'R'; break;
 895         case IP_VS_CONN_F_BYPASS:
 896                 fwd = 'B'; break;
 897         default:
 898                 fwd = '?'; break;
 899         }
 900         return fwd;
 901 }
 902
 903 extern void ip_vs_nat_icmp(struct sk_buff *skb, struct ip_vs_protocol *pp,
 904                            struct ip_vs_conn *cp, int dir);
 905
 906 #ifdef CONFIG_IP_VS_IPV6
 907 extern void ip_vs_nat_icmp_v6(struct sk_buff *skb, struct ip_vs_protocol *pp,
 908                               struct ip_vs_conn *cp, int dir);
 909 #endif
 910
 911 extern __sum16 ip_vs_checksum_complete(struct sk_buff *skb, int offset);
 912
 913 static inline __wsum ip_vs_check_diff4(__be32 old, __be32 new, __wsum oldsum)
 914 {
 915         __be32 diff[2] = { ~old, new };
 916
 917         return csum_partial(diff, sizeof(diff), oldsum);
 918 }
 919
 920 #ifdef CONFIG_IP_VS_IPV6
 921 static inline __wsum ip_vs_check_diff16(const __be32 *old, const __be32 *new,
 922                                         __wsum oldsum)
 923 {
 924         __be32 diff[8] = { ~old[3], ~old[2], ~old[1], ~old[0],
 925                             new[3],  new[2],  new[1],  new[0] };
 926
 927         return csum_partial(diff, sizeof(diff), oldsum);
 928 }
 929 #endif
 930
 931 static inline __wsum ip_vs_check_diff2(__be16 old, __be16 new, __wsum oldsum)
 932 {
 933         __be16 diff[2] = { ~old, new };
 934
 935         return csum_partial(diff, sizeof(diff), oldsum);
 936 }
 937
 938 #endif /* __KERNEL__ */
 939
 940 #endif  /* _NET_IP_VS_H */