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