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