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 #include <asm/types.h>                  /* for __uXX types */
  12
  13 #include <linux/list.h>                 /* for struct list_head */
  14 #include <linux/spinlock.h>             /* for struct rwlock_t */
  15 #include <linux/atomic.h>                 /* for struct atomic_t */
  16 #include <linux/compiler.h>
  17 #include <linux/timer.h>
  18 #include <linux/bug.h>
  19
  20 #include <net/checksum.h>
  21 #include <linux/netfilter.h>            /* for union nf_inet_addr */
  22 #include <linux/ip.h>
  23 #include <linux/ipv6.h>                 /* for struct ipv6hdr */
  24 #include <net/ipv6.h>
  25 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
  26 #include <net/netfilter/nf_conntrack.h>
  27 #endif
  28 #include <net/net_namespace.h>          /* Netw namespace */
  29
  30 /*
  31  * Generic access of ipvs struct
  32  */
  33 static inline struct netns_ipvs *net_ipvs(struct net* net)
  34 {
  35         return net->ipvs;
  36 }
  37 /*
  38  * Get net ptr from skb in traffic cases
  39  * use skb_sknet when call is from userland (ioctl or netlink)
  40  */
  41 static inline struct net *skb_net(const struct sk_buff *skb)
  42 {
  43 #ifdef CONFIG_NET_NS
  44 #ifdef CONFIG_IP_VS_DEBUG
  45         /*
  46          * This is used for debug only.
  47          * Start with the most likely hit
  48          * End with BUG
  49          */
  50         if (likely(skb->dev && skb->dev->nd_net))
  51                 return dev_net(skb->dev);
  52         if (skb_dst(skb) && skb_dst(skb)->dev)
  53                 return dev_net(skb_dst(skb)->dev);
  54         WARN(skb->sk, "Maybe skb_sknet should be used in %s() at line:%d\n",
  55                       __func__, __LINE__);
  56         if (likely(skb->sk && skb->sk->sk_net))
  57                 return sock_net(skb->sk);
  58         pr_err("There is no net ptr to find in the skb in %s() line:%d\n",
  59                 __func__, __LINE__);
  60         BUG();
  61 #else
  62         return dev_net(skb->dev ? : skb_dst(skb)->dev);
  63 #endif
  64 #else
  65         return &init_net;
  66 #endif
  67 }
  68
  69 static inline struct net *skb_sknet(const struct sk_buff *skb)
  70 {
  71 #ifdef CONFIG_NET_NS
  72 #ifdef CONFIG_IP_VS_DEBUG
  73         /* Start with the most likely hit */
  74         if (likely(skb->sk && skb->sk->sk_net))
  75                 return sock_net(skb->sk);
  76         WARN(skb->dev, "Maybe skb_net should be used instead in %s() line:%d\n",
  77                        __func__, __LINE__);
  78         if (likely(skb->dev && skb->dev->nd_net))
  79                 return dev_net(skb->dev);
  80         pr_err("There is no net ptr to find in the skb in %s() line:%d\n",
  81                 __func__, __LINE__);
  82         BUG();
  83 #else
  84         return sock_net(skb->sk);
  85 #endif
  86 #else
  87         return &init_net;
  88 #endif
  89 }
  90 /*
  91  * This one needed for single_open_net since net is stored directly in
  92  * private not as a struct i.e. seq_file_net can't be used.
  93  */
  94 static inline struct net *seq_file_single_net(struct seq_file *seq)
  95 {
  96 #ifdef CONFIG_NET_NS
  97         return (struct net *)seq->private;
  98 #else
  99         return &init_net;
 100 #endif
 101 }
 102
 103 /* Connections' size value needed by ip_vs_ctl.c */
 104 extern int ip_vs_conn_tab_size;
 105
 106
 107 struct ip_vs_iphdr {
 108         int len;
 109         __u8 protocol;
 110         union nf_inet_addr saddr;
 111         union nf_inet_addr daddr;
 112 };
 113
 114 static inline void
 115 ip_vs_fill_iphdr(int af, const void *nh, struct ip_vs_iphdr *iphdr)
 116 {
 117 #ifdef CONFIG_IP_VS_IPV6
 118         if (af == AF_INET6) {
 119                 const struct ipv6hdr *iph = nh;
 120                 iphdr->len = sizeof(struct ipv6hdr);
 121                 iphdr->protocol = iph->nexthdr;
 122                 iphdr->saddr.in6 = iph->saddr;
 123                 iphdr->daddr.in6 = iph->daddr;
 124         } else
 125 #endif
 126         {
 127                 const struct iphdr *iph = nh;
 128                 iphdr->len = iph->ihl * 4;
 129                 iphdr->protocol = iph->protocol;
 130                 iphdr->saddr.ip = iph->saddr;
 131                 iphdr->daddr.ip = iph->daddr;
 132         }
 133 }
 134
 135 static inline void ip_vs_addr_copy(int af, union nf_inet_addr *dst,
 136                                    const union nf_inet_addr *src)
 137 {
 138 #ifdef CONFIG_IP_VS_IPV6
 139         if (af == AF_INET6)
 140                 dst->in6 = src->in6;
 141         else
 142 #endif
 143         dst->ip = src->ip;
 144 }
 145
 146 static inline int ip_vs_addr_equal(int af, const union nf_inet_addr *a,
 147                                    const union nf_inet_addr *b)
 148 {
 149 #ifdef CONFIG_IP_VS_IPV6
 150         if (af == AF_INET6)
 151                 return ipv6_addr_equal(&a->in6, &b->in6);
 152 #endif
 153         return a->ip == b->ip;
 154 }
 155
 156 #ifdef CONFIG_IP_VS_DEBUG
 157 #include <linux/net.h>
 158
 159 extern int ip_vs_get_debug_level(void);
 160
 161 static inline const char *ip_vs_dbg_addr(int af, char *buf, size_t buf_len,
 162                                          const union nf_inet_addr *addr,
 163                                          int *idx)
 164 {
 165         int len;
 166 #ifdef CONFIG_IP_VS_IPV6
 167         if (af == AF_INET6)
 168                 len = snprintf(&buf[*idx], buf_len - *idx, "[%pI6]",
 169                                &addr->in6) + 1;
 170         else
 171 #endif
 172                 len = snprintf(&buf[*idx], buf_len - *idx, "%pI4",
 173                                &addr->ip) + 1;
 174
 175         *idx += len;
 176         BUG_ON(*idx > buf_len + 1);
 177         return &buf[*idx - len];
 178 }
 179
 180 #define IP_VS_DBG_BUF(level, msg, ...)                                  \
 181         do {                                                            \
 182                 char ip_vs_dbg_buf[160];                                \
 183                 int ip_vs_dbg_idx = 0;                                  \
 184                 if (level <= ip_vs_get_debug_level())                   \
 185                         printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__);  \
 186         } while (0)
 187 #define IP_VS_ERR_BUF(msg...)                                           \
 188         do {                                                            \
 189                 char ip_vs_dbg_buf[160];                                \
 190                 int ip_vs_dbg_idx = 0;                                  \
 191                 pr_err(msg);                                            \
 192         } while (0)
 193
 194 /* Only use from within IP_VS_DBG_BUF() or IP_VS_ERR_BUF macros */
 195 #define IP_VS_DBG_ADDR(af, addr)                                        \
 196         ip_vs_dbg_addr(af, ip_vs_dbg_buf,                               \
 197                        sizeof(ip_vs_dbg_buf), addr,                     \
 198                        &ip_vs_dbg_idx)
 199
 200 #define IP_VS_DBG(level, msg, ...)                                      \
 201         do {                                                            \
 202                 if (level <= ip_vs_get_debug_level())                   \
 203                         printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__);  \
 204         } while (0)
 205 #define IP_VS_DBG_RL(msg, ...)                                          \
 206         do {                                                            \
 207                 if (net_ratelimit())                                    \
 208                         printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__);  \
 209         } while (0)
 210 #define IP_VS_DBG_PKT(level, af, pp, skb, ofs, msg)                     \
 211         do {                                                            \
 212                 if (level <= ip_vs_get_debug_level())                   \
 213                         pp->debug_packet(af, pp, skb, ofs, msg);        \
 214         } while (0)
 215 #define IP_VS_DBG_RL_PKT(level, af, pp, skb, ofs, msg)                  \
 216         do {                                                            \
 217                 if (level <= ip_vs_get_debug_level() &&                 \
 218                     net_ratelimit())                                    \
 219                         pp->debug_packet(af, pp, skb, ofs, msg);        \
 220         } while (0)
 221 #else   /* NO DEBUGGING at ALL */
 222 #define IP_VS_DBG_BUF(level, msg...)  do {} while (0)
 223 #define IP_VS_ERR_BUF(msg...)  do {} while (0)
 224 #define IP_VS_DBG(level, msg...)  do {} while (0)
 225 #define IP_VS_DBG_RL(msg...)  do {} while (0)
 226 #define IP_VS_DBG_PKT(level, af, pp, skb, ofs, msg)     do {} while (0)
 227 #define IP_VS_DBG_RL_PKT(level, af, pp, skb, ofs, msg)  do {} while (0)
 228 #endif
 229
 230 #define IP_VS_BUG() BUG()
 231 #define IP_VS_ERR_RL(msg, ...)                                          \
 232         do {                                                            \
 233                 if (net_ratelimit())                                    \
 234                         pr_err(msg, ##__VA_ARGS__);                     \
 235         } while (0)
 236
 237 #ifdef CONFIG_IP_VS_DEBUG
 238 #define EnterFunction(level)                                            \
 239         do {                                                            \
 240                 if (level <= ip_vs_get_debug_level())                   \
 241                         printk(KERN_DEBUG                               \
 242                                pr_fmt("Enter: %s, %s line %i\n"),       \
 243                                __func__, __FILE__, __LINE__);           \
 244         } while (0)
 245 #define LeaveFunction(level)                                            \
 246         do {                                                            \
 247                 if (level <= ip_vs_get_debug_level())                   \
 248                         printk(KERN_DEBUG                               \
 249                                pr_fmt("Leave: %s, %s line %i\n"),       \
 250                                __func__, __FILE__, __LINE__);           \
 251         } while (0)
 252 #else
 253 #define EnterFunction(level)   do {} while (0)
 254 #define LeaveFunction(level)   do {} while (0)
 255 #endif
 256
 257 #define IP_VS_WAIT_WHILE(expr)  while (expr) { cpu_relax(); }
 258
 259
 260 /*
 261  *      The port number of FTP service (in network order).
 262  */
 263 #define FTPPORT  cpu_to_be16(21)
 264 #define FTPDATA  cpu_to_be16(20)
 265
 266 /*
 267  *      TCP State Values
 268  */
 269 enum {
 270         IP_VS_TCP_S_NONE = 0,
 271         IP_VS_TCP_S_ESTABLISHED,
 272         IP_VS_TCP_S_SYN_SENT,
 273         IP_VS_TCP_S_SYN_RECV,
 274         IP_VS_TCP_S_FIN_WAIT,
 275         IP_VS_TCP_S_TIME_WAIT,
 276         IP_VS_TCP_S_CLOSE,
 277         IP_VS_TCP_S_CLOSE_WAIT,
 278         IP_VS_TCP_S_LAST_ACK,
 279         IP_VS_TCP_S_LISTEN,
 280         IP_VS_TCP_S_SYNACK,
 281         IP_VS_TCP_S_LAST
 282 };
 283
 284 /*
 285  *      UDP State Values
 286  */
 287 enum {
 288         IP_VS_UDP_S_NORMAL,
 289         IP_VS_UDP_S_LAST,
 290 };
 291
 292 /*
 293  *      ICMP State Values
 294  */
 295 enum {
 296         IP_VS_ICMP_S_NORMAL,
 297         IP_VS_ICMP_S_LAST,
 298 };
 299
 300 /*
 301  *      SCTP State Values
 302  */
 303 enum ip_vs_sctp_states {
 304         IP_VS_SCTP_S_NONE,
 305         IP_VS_SCTP_S_INIT_CLI,
 306         IP_VS_SCTP_S_INIT_SER,
 307         IP_VS_SCTP_S_INIT_ACK_CLI,
 308         IP_VS_SCTP_S_INIT_ACK_SER,
 309         IP_VS_SCTP_S_ECHO_CLI,
 310         IP_VS_SCTP_S_ECHO_SER,
 311         IP_VS_SCTP_S_ESTABLISHED,
 312         IP_VS_SCTP_S_SHUT_CLI,
 313         IP_VS_SCTP_S_SHUT_SER,
 314         IP_VS_SCTP_S_SHUT_ACK_CLI,
 315         IP_VS_SCTP_S_SHUT_ACK_SER,
 316         IP_VS_SCTP_S_CLOSED,
 317         IP_VS_SCTP_S_LAST
 318 };
 319
 320 /*
 321  *      Delta sequence info structure
 322  *      Each ip_vs_conn has 2 (output AND input seq. changes).
 323  *      Only used in the VS/NAT.
 324  */
 325 struct ip_vs_seq {
 326         __u32                   init_seq;       /* Add delta from this seq */
 327         __u32                   delta;          /* Delta in sequence numbers */
 328         __u32                   previous_delta; /* Delta in sequence numbers
 329                                                    before last resized pkt */
 330 };
 331
 332 /*
 333  * counters per cpu
 334  */
 335 struct ip_vs_counters {
 336         __u32           conns;          /* connections scheduled */
 337         __u32           inpkts;         /* incoming packets */
 338         __u32           outpkts;        /* outgoing packets */
 339         __u64           inbytes;        /* incoming bytes */
 340         __u64           outbytes;       /* outgoing bytes */
 341 };
 342 /*
 343  * Stats per cpu
 344  */
 345 struct ip_vs_cpu_stats {
 346         struct ip_vs_counters   ustats;
 347         struct u64_stats_sync   syncp;
 348 };
 349
 350 /*
 351  *      IPVS statistics objects
 352  */
 353 struct ip_vs_estimator {
 354         struct list_head        list;
 355
 356         u64                     last_inbytes;
 357         u64                     last_outbytes;
 358         u32                     last_conns;
 359         u32                     last_inpkts;
 360         u32                     last_outpkts;
 361
 362         u32                     cps;
 363         u32                     inpps;
 364         u32                     outpps;
 365         u32                     inbps;
 366         u32                     outbps;
 367 };
 368
 369 struct ip_vs_stats {
 370         struct ip_vs_stats_user ustats;         /* statistics */
 371         struct ip_vs_estimator  est;            /* estimator */
 372         struct ip_vs_cpu_stats  *cpustats;      /* per cpu counters */
 373         spinlock_t              lock;           /* spin lock */
 374         struct ip_vs_stats_user ustats0;        /* reset values */
 375 };
 376
 377 struct dst_entry;
 378 struct iphdr;
 379 struct ip_vs_conn;
 380 struct ip_vs_app;
 381 struct sk_buff;
 382 struct ip_vs_proto_data;
 383
 384 struct ip_vs_protocol {
 385         struct ip_vs_protocol   *next;
 386         char                    *name;
 387         u16                     protocol;
 388         u16                     num_states;
 389         int                     dont_defrag;
 390
 391         void (*init)(struct ip_vs_protocol *pp);
 392
 393         void (*exit)(struct ip_vs_protocol *pp);
 394
 395         int (*init_netns)(struct net *net, struct ip_vs_proto_data *pd);
 396
 397         void (*exit_netns)(struct net *net, struct ip_vs_proto_data *pd);
 398
 399         int (*conn_schedule)(int af, struct sk_buff *skb,
 400                              struct ip_vs_proto_data *pd,
 401                              int *verdict, struct ip_vs_conn **cpp);
 402
 403         struct ip_vs_conn *
 404         (*conn_in_get)(int af,
 405                        const struct sk_buff *skb,
 406                        const struct ip_vs_iphdr *iph,
 407                        unsigned int proto_off,
 408                        int inverse);
 409
 410         struct ip_vs_conn *
 411         (*conn_out_get)(int af,
 412                         const struct sk_buff *skb,
 413                         const struct ip_vs_iphdr *iph,
 414                         unsigned int proto_off,
 415                         int inverse);
 416
 417         int (*snat_handler)(struct sk_buff *skb,
 418                             struct ip_vs_protocol *pp, struct ip_vs_conn *cp);
 419
 420         int (*dnat_handler)(struct sk_buff *skb,
 421                             struct ip_vs_protocol *pp, struct ip_vs_conn *cp);
 422
 423         int (*csum_check)(int af, struct sk_buff *skb,
 424                           struct ip_vs_protocol *pp);
 425
 426         const char *(*state_name)(int state);
 427
 428         void (*state_transition)(struct ip_vs_conn *cp, int direction,
 429                                  const struct sk_buff *skb,
 430                                  struct ip_vs_proto_data *pd);
 431
 432         int (*register_app)(struct net *net, struct ip_vs_app *inc);
 433
 434         void (*unregister_app)(struct net *net, struct ip_vs_app *inc);
 435
 436         int (*app_conn_bind)(struct ip_vs_conn *cp);
 437
 438         void (*debug_packet)(int af, struct ip_vs_protocol *pp,
 439                              const struct sk_buff *skb,
 440                              int offset,
 441                              const char *msg);
 442
 443         void (*timeout_change)(struct ip_vs_proto_data *pd, int flags);
 444 };
 445
 446 /*
 447  * protocol data per netns
 448  */
 449 struct ip_vs_proto_data {
 450         struct ip_vs_proto_data *next;
 451         struct ip_vs_protocol   *pp;
 452         int                     *timeout_table; /* protocol timeout table */
 453         atomic_t                appcnt;         /* counter of proto app incs. */
 454         struct tcp_states_t     *tcp_state_table;
 455 };
 456
 457 extern struct ip_vs_protocol   *ip_vs_proto_get(unsigned short proto);
 458 extern struct ip_vs_proto_data *ip_vs_proto_data_get(struct net *net,
 459                                                      unsigned short proto);
 460
 461 struct ip_vs_conn_param {
 462         struct net                      *net;
 463         const union nf_inet_addr        *caddr;
 464         const union nf_inet_addr        *vaddr;
 465         __be16                          cport;
 466         __be16                          vport;
 467         __u16                           protocol;
 468         u16                             af;
 469
 470         const struct ip_vs_pe           *pe;
 471         char                            *pe_data;
 472         __u8                            pe_data_len;
 473 };
 474
 475 /*
 476  *      IP_VS structure allocated for each dynamically scheduled connection
 477  */
 478 struct ip_vs_conn {
 479         struct hlist_node       c_list;         /* hashed list heads */
 480 #ifdef CONFIG_NET_NS
 481         struct net              *net;           /* Name space */
 482 #endif
 483         /* Protocol, addresses and port numbers */
 484         u16                     af;             /* address family */
 485         __be16                  cport;
 486         __be16                  vport;
 487         __be16                  dport;
 488         __u32                   fwmark;         /* Fire wall mark from skb */
 489         union nf_inet_addr      caddr;          /* client address */
 490         union nf_inet_addr      vaddr;          /* virtual address */
 491         union nf_inet_addr      daddr;          /* destination address */
 492         volatile __u32          flags;          /* status flags */
 493         __u16                   protocol;       /* Which protocol (TCP/UDP) */
 494
 495         /* counter and timer */
 496         atomic_t                refcnt;         /* reference count */
 497         struct timer_list       timer;          /* Expiration timer */
 498         volatile unsigned long  timeout;        /* timeout */
 499
 500         /* Flags and state transition */
 501         spinlock_t              lock;           /* lock for state transition */
 502         volatile __u16          state;          /* state info */
 503         volatile __u16          old_state;      /* old state, to be used for
 504                                                  * state transition triggerd
 505                                                  * synchronization
 506                                                  */
 507         unsigned long           sync_endtime;   /* jiffies + sent_retries */
 508
 509         /* Control members */
 510         struct ip_vs_conn       *control;       /* Master control connection */
 511         atomic_t                n_control;      /* Number of controlled ones */
 512         struct ip_vs_dest       *dest;          /* real server */
 513         atomic_t                in_pkts;        /* incoming packet counter */
 514
 515         /* packet transmitter for different forwarding methods.  If it
 516            mangles the packet, it must return NF_DROP or better NF_STOLEN,
 517            otherwise this must be changed to a sk_buff **.
 518            NF_ACCEPT can be returned when destination is local.
 519          */
 520         int (*packet_xmit)(struct sk_buff *skb, struct ip_vs_conn *cp,
 521                            struct ip_vs_protocol *pp);
 522
 523         /* Note: we can group the following members into a structure,
 524            in order to save more space, and the following members are
 525            only used in VS/NAT anyway */
 526         struct ip_vs_app        *app;           /* bound ip_vs_app object */
 527         void                    *app_data;      /* Application private data */
 528         struct ip_vs_seq        in_seq;         /* incoming seq. struct */
 529         struct ip_vs_seq        out_seq;        /* outgoing seq. struct */
 530
 531         const struct ip_vs_pe   *pe;
 532         char                    *pe_data;
 533         __u8                    pe_data_len;
 534 };
 535
 536 /*
 537  *  To save some memory in conn table when name space is disabled.
 538  */
 539 static inline struct net *ip_vs_conn_net(const struct ip_vs_conn *cp)
 540 {
 541 #ifdef CONFIG_NET_NS
 542         return cp->net;
 543 #else
 544         return &init_net;
 545 #endif
 546 }
 547 static inline void ip_vs_conn_net_set(struct ip_vs_conn *cp, struct net *net)
 548 {
 549 #ifdef CONFIG_NET_NS
 550         cp->net = net;
 551 #endif
 552 }
 553
 554 static inline int ip_vs_conn_net_eq(const struct ip_vs_conn *cp,
 555                                     struct net *net)
 556 {
 557 #ifdef CONFIG_NET_NS
 558         return cp->net == net;
 559 #else
 560         return 1;
 561 #endif
 562 }
 563
 564 /*
 565  *      Extended internal versions of struct ip_vs_service_user and
 566  *      ip_vs_dest_user for IPv6 support.
 567  *
 568  *      We need these to conveniently pass around service and destination
 569  *      options, but unfortunately, we also need to keep the old definitions to
 570  *      maintain userspace backwards compatibility for the setsockopt interface.
 571  */
 572 struct ip_vs_service_user_kern {
 573         /* virtual service addresses */
 574         u16                     af;
 575         u16                     protocol;
 576         union nf_inet_addr      addr;           /* virtual ip address */
 577         u16                     port;
 578         u32                     fwmark;         /* firwall mark of service */
 579
 580         /* virtual service options */
 581         char                    *sched_name;
 582         char                    *pe_name;
 583         unsigned int            flags;          /* virtual service flags */
 584         unsigned int            timeout;        /* persistent timeout in sec */
 585         u32                     netmask;        /* persistent netmask */
 586 };
 587
 588
 589 struct ip_vs_dest_user_kern {
 590         /* destination server address */
 591         union nf_inet_addr      addr;
 592         u16                     port;
 593
 594         /* real server options */
 595         unsigned int            conn_flags;     /* connection flags */
 596         int                     weight;         /* destination weight */
 597
 598         /* thresholds for active connections */
 599         u32                     u_threshold;    /* upper threshold */
 600         u32                     l_threshold;    /* lower threshold */
 601 };
 602
 603
 604 /*
 605  *      The information about the virtual service offered to the net
 606  *      and the forwarding entries
 607  */
 608 struct ip_vs_service {
 609         struct list_head        s_list;   /* for normal service table */
 610         struct list_head        f_list;   /* for fwmark-based service table */
 611         atomic_t                refcnt;   /* reference counter */
 612         atomic_t                usecnt;   /* use counter */
 613
 614         u16                     af;       /* address family */
 615         __u16                   protocol; /* which protocol (TCP/UDP) */
 616         union nf_inet_addr      addr;     /* IP address for virtual service */
 617         __be16                  port;     /* port number for the service */
 618         __u32                   fwmark;   /* firewall mark of the service */
 619         unsigned int            flags;    /* service status flags */
 620         unsigned int            timeout;  /* persistent timeout in ticks */
 621         __be32                  netmask;  /* grouping granularity */
 622         struct net              *net;
 623
 624         struct list_head        destinations;  /* real server d-linked list */
 625         __u32                   num_dests;     /* number of servers */
 626         struct ip_vs_stats      stats;         /* statistics for the service */
 627         struct ip_vs_app        *inc;     /* bind conns to this app inc */
 628
 629         /* for scheduling */
 630         struct ip_vs_scheduler  *scheduler;    /* bound scheduler object */
 631         rwlock_t                sched_lock;    /* lock sched_data */
 632         void                    *sched_data;   /* scheduler application data */
 633
 634         /* alternate persistence engine */
 635         struct ip_vs_pe         *pe;
 636 };
 637
 638
 639 /*
 640  *      The real server destination forwarding entry
 641  *      with ip address, port number, and so on.
 642  */
 643 struct ip_vs_dest {
 644         struct list_head        n_list;   /* for the dests in the service */
 645         struct list_head        d_list;   /* for table with all the dests */
 646
 647         u16                     af;             /* address family */
 648         __be16                  port;           /* port number of the server */
 649         union nf_inet_addr      addr;           /* IP address of the server */
 650         volatile unsigned int   flags;          /* dest status flags */
 651         atomic_t                conn_flags;     /* flags to copy to conn */
 652         atomic_t                weight;         /* server weight */
 653
 654         atomic_t                refcnt;         /* reference counter */
 655         struct ip_vs_stats      stats;          /* statistics */
 656
 657         /* connection counters and thresholds */
 658         atomic_t                activeconns;    /* active connections */
 659         atomic_t                inactconns;     /* inactive connections */
 660         atomic_t                persistconns;   /* persistent connections */
 661         __u32                   u_threshold;    /* upper threshold */
 662         __u32                   l_threshold;    /* lower threshold */
 663
 664         /* for destination cache */
 665         spinlock_t              dst_lock;       /* lock of dst_cache */
 666         struct dst_entry        *dst_cache;     /* destination cache entry */
 667         u32                     dst_rtos;       /* RT_TOS(tos) for dst */
 668         u32                     dst_cookie;
 669         union nf_inet_addr      dst_saddr;
 670
 671         /* for virtual service */
 672         struct ip_vs_service    *svc;           /* service it belongs to */
 673         __u16                   protocol;       /* which protocol (TCP/UDP) */
 674         __be16                  vport;          /* virtual port number */
 675         union nf_inet_addr      vaddr;          /* virtual IP address */
 676         __u32                   vfwmark;        /* firewall mark of service */
 677 };
 678
 679
 680 /*
 681  *      The scheduler object
 682  */
 683 struct ip_vs_scheduler {
 684         struct list_head        n_list;         /* d-linked list head */
 685         char                    *name;          /* scheduler name */
 686         atomic_t                refcnt;         /* reference counter */
 687         struct module           *module;        /* THIS_MODULE/NULL */
 688
 689         /* scheduler initializing service */
 690         int (*init_service)(struct ip_vs_service *svc);
 691         /* scheduling service finish */
 692         int (*done_service)(struct ip_vs_service *svc);
 693         /* scheduler updating service */
 694         int (*update_service)(struct ip_vs_service *svc);
 695
 696         /* selecting a server from the given service */
 697         struct ip_vs_dest* (*schedule)(struct ip_vs_service *svc,
 698                                        const struct sk_buff *skb);
 699 };
 700
 701 /* The persistence engine object */
 702 struct ip_vs_pe {
 703         struct list_head        n_list;         /* d-linked list head */
 704         char                    *name;          /* scheduler name */
 705         atomic_t                refcnt;         /* reference counter */
 706         struct module           *module;        /* THIS_MODULE/NULL */
 707
 708         /* get the connection template, if any */
 709         int (*fill_param)(struct ip_vs_conn_param *p, struct sk_buff *skb);
 710         bool (*ct_match)(const struct ip_vs_conn_param *p,
 711                          struct ip_vs_conn *ct);
 712         u32 (*hashkey_raw)(const struct ip_vs_conn_param *p, u32 initval,
 713                            bool inverse);
 714         int (*show_pe_data)(const struct ip_vs_conn *cp, char *buf);
 715 };
 716
 717 /*
 718  *      The application module object (a.k.a. app incarnation)
 719  */
 720 struct ip_vs_app {
 721         struct list_head        a_list;         /* member in app list */
 722         int                     type;           /* IP_VS_APP_TYPE_xxx */
 723         char                    *name;          /* application module name */
 724         __u16                   protocol;
 725         struct module           *module;        /* THIS_MODULE/NULL */
 726         struct list_head        incs_list;      /* list of incarnations */
 727
 728         /* members for application incarnations */
 729         struct list_head        p_list;         /* member in proto app list */
 730         struct ip_vs_app        *app;           /* its real application */
 731         __be16                  port;           /* port number in net order */
 732         atomic_t                usecnt;         /* usage counter */
 733
 734         /*
 735          * output hook: Process packet in inout direction, diff set for TCP.
 736          * Return: 0=Error, 1=Payload Not Mangled/Mangled but checksum is ok,
 737          *         2=Mangled but checksum was not updated
 738          */
 739         int (*pkt_out)(struct ip_vs_app *, struct ip_vs_conn *,
 740                        struct sk_buff *, int *diff);
 741
 742         /*
 743          * input hook: Process packet in outin direction, diff set for TCP.
 744          * Return: 0=Error, 1=Payload Not Mangled/Mangled but checksum is ok,
 745          *         2=Mangled but checksum was not updated
 746          */
 747         int (*pkt_in)(struct ip_vs_app *, struct ip_vs_conn *,
 748                       struct sk_buff *, int *diff);
 749
 750         /* ip_vs_app initializer */
 751         int (*init_conn)(struct ip_vs_app *, struct ip_vs_conn *);
 752
 753         /* ip_vs_app finish */
 754         int (*done_conn)(struct ip_vs_app *, struct ip_vs_conn *);
 755
 756
 757         /* not used now */
 758         int (*bind_conn)(struct ip_vs_app *, struct ip_vs_conn *,
 759                          struct ip_vs_protocol *);
 760
 761         void (*unbind_conn)(struct ip_vs_app *, struct ip_vs_conn *);
 762
 763         int *                   timeout_table;
 764         int *                   timeouts;
 765         int                     timeouts_size;
 766
 767         int (*conn_schedule)(struct sk_buff *skb, struct ip_vs_app *app,
 768                              int *verdict, struct ip_vs_conn **cpp);
 769
 770         struct ip_vs_conn *
 771         (*conn_in_get)(const struct sk_buff *skb, struct ip_vs_app *app,
 772                        const struct iphdr *iph, unsigned int proto_off,
 773                        int inverse);
 774
 775         struct ip_vs_conn *
 776         (*conn_out_get)(const struct sk_buff *skb, struct ip_vs_app *app,
 777                         const struct iphdr *iph, unsigned int proto_off,
 778                         int inverse);
 779
 780         int (*state_transition)(struct ip_vs_conn *cp, int direction,
 781                                 const struct sk_buff *skb,
 782                                 struct ip_vs_app *app);
 783
 784         void (*timeout_change)(struct ip_vs_app *app, int flags);
 785 };
 786
 787 struct ipvs_master_sync_state {
 788         struct list_head        sync_queue;
 789         struct ip_vs_sync_buff  *sync_buff;
 790         int                     sync_queue_len;
 791         unsigned int            sync_queue_delay;
 792         struct task_struct      *master_thread;
 793         struct delayed_work     master_wakeup_work;
 794         struct netns_ipvs       *ipvs;
 795 };
 796
 797 /* IPVS in network namespace */
 798 struct netns_ipvs {
 799         int                     gen;            /* Generation */
 800         int                     enable;         /* enable like nf_hooks do */
 801         /*
 802          *      Hash table: for real service lookups
 803          */
 804         #define IP_VS_RTAB_BITS 4
 805         #define IP_VS_RTAB_SIZE (1 << IP_VS_RTAB_BITS)
 806         #define IP_VS_RTAB_MASK (IP_VS_RTAB_SIZE - 1)
 807
 808         struct list_head        rs_table[IP_VS_RTAB_SIZE];
 809         /* ip_vs_app */
 810         struct list_head        app_list;
 811         /* ip_vs_ftp */
 812         struct ip_vs_app        *ftp_app;
 813         /* ip_vs_proto */
 814         #define IP_VS_PROTO_TAB_SIZE    32      /* must be power of 2 */
 815         struct ip_vs_proto_data *proto_data_table[IP_VS_PROTO_TAB_SIZE];
 816         /* ip_vs_proto_tcp */
 817 #ifdef CONFIG_IP_VS_PROTO_TCP
 818         #define TCP_APP_TAB_BITS        4
 819         #define TCP_APP_TAB_SIZE        (1 << TCP_APP_TAB_BITS)
 820         #define TCP_APP_TAB_MASK        (TCP_APP_TAB_SIZE - 1)
 821         struct list_head        tcp_apps[TCP_APP_TAB_SIZE];
 822         spinlock_t              tcp_app_lock;
 823 #endif
 824         /* ip_vs_proto_udp */
 825 #ifdef CONFIG_IP_VS_PROTO_UDP
 826         #define UDP_APP_TAB_BITS        4
 827         #define UDP_APP_TAB_SIZE        (1 << UDP_APP_TAB_BITS)
 828         #define UDP_APP_TAB_MASK        (UDP_APP_TAB_SIZE - 1)
 829         struct list_head        udp_apps[UDP_APP_TAB_SIZE];
 830         spinlock_t              udp_app_lock;
 831 #endif
 832         /* ip_vs_proto_sctp */
 833 #ifdef CONFIG_IP_VS_PROTO_SCTP
 834         #define SCTP_APP_TAB_BITS       4
 835         #define SCTP_APP_TAB_SIZE       (1 << SCTP_APP_TAB_BITS)
 836         #define SCTP_APP_TAB_MASK       (SCTP_APP_TAB_SIZE - 1)
 837         /* Hash table for SCTP application incarnations  */
 838         struct list_head        sctp_apps[SCTP_APP_TAB_SIZE];
 839         spinlock_t              sctp_app_lock;
 840 #endif
 841         /* ip_vs_conn */
 842         atomic_t                conn_count;      /*  connection counter */
 843
 844         /* ip_vs_ctl */
 845         struct ip_vs_stats              tot_stats;  /* Statistics & est. */
 846
 847         int                     num_services;    /* no of virtual services */
 848
 849         rwlock_t                rs_lock;         /* real services table */
 850         /* Trash for destinations */
 851         struct list_head        dest_trash;
 852         /* Service counters */
 853         atomic_t                ftpsvc_counter;
 854         atomic_t                nullsvc_counter;
 855
 856 #ifdef CONFIG_SYSCTL
 857         /* 1/rate drop and drop-entry variables */
 858         struct delayed_work     defense_work;   /* Work handler */
 859         int                     drop_rate;
 860         int                     drop_counter;
 861         atomic_t                dropentry;
 862         /* locks in ctl.c */
 863         spinlock_t              dropentry_lock;  /* drop entry handling */
 864         spinlock_t              droppacket_lock; /* drop packet handling */
 865         spinlock_t              securetcp_lock;  /* state and timeout tables */
 866
 867         /* sys-ctl struct */
 868         struct ctl_table_header *sysctl_hdr;
 869         struct ctl_table        *sysctl_tbl;
 870 #endif
 871
 872         /* sysctl variables */
 873         int                     sysctl_amemthresh;
 874         int                     sysctl_am_droprate;
 875         int                     sysctl_drop_entry;
 876         int                     sysctl_drop_packet;
 877         int                     sysctl_secure_tcp;
 878 #ifdef CONFIG_IP_VS_NFCT
 879         int                     sysctl_conntrack;
 880 #endif
 881         int                     sysctl_snat_reroute;
 882         int                     sysctl_sync_ver;
 883         int                     sysctl_sync_ports;
 884         int                     sysctl_sync_qlen_max;
 885         int                     sysctl_sync_sock_size;
 886         int                     sysctl_cache_bypass;
 887         int                     sysctl_expire_nodest_conn;
 888         int                     sysctl_expire_quiescent_template;
 889         int                     sysctl_sync_threshold[2];
 890         unsigned int            sysctl_sync_refresh_period;
 891         int                     sysctl_sync_retries;
 892         int                     sysctl_nat_icmp_send;
 893
 894         /* ip_vs_lblc */
 895         int                     sysctl_lblc_expiration;
 896         struct ctl_table_header *lblc_ctl_header;
 897         struct ctl_table        *lblc_ctl_table;
 898         /* ip_vs_lblcr */
 899         int                     sysctl_lblcr_expiration;
 900         struct ctl_table_header *lblcr_ctl_header;
 901         struct ctl_table        *lblcr_ctl_table;
 902         /* ip_vs_est */
 903         struct list_head        est_list;       /* estimator list */
 904         spinlock_t              est_lock;
 905         struct timer_list       est_timer;      /* Estimation timer */
 906         /* ip_vs_sync */
 907         spinlock_t              sync_lock;
 908         struct ipvs_master_sync_state *ms;
 909         spinlock_t              sync_buff_lock;
 910         struct task_struct      **backup_threads;
 911         int                     threads_mask;
 912         int                     send_mesg_maxlen;
 913         int                     recv_mesg_maxlen;
 914         volatile int            sync_state;
 915         volatile int            master_syncid;
 916         volatile int            backup_syncid;
 917         struct mutex            sync_mutex;
 918         /* multicast interface name */
 919         char                    master_mcast_ifn[IP_VS_IFNAME_MAXLEN];
 920         char                    backup_mcast_ifn[IP_VS_IFNAME_MAXLEN];
 921         /* net name space ptr */
 922         struct net              *net;            /* Needed by timer routines */
 923 };
 924
 925 #define DEFAULT_SYNC_THRESHOLD  3
 926 #define DEFAULT_SYNC_PERIOD     50
 927 #define DEFAULT_SYNC_VER        1
 928 #define DEFAULT_SYNC_REFRESH_PERIOD     (0U * HZ)
 929 #define DEFAULT_SYNC_RETRIES            0
 930 #define IPVS_SYNC_WAKEUP_RATE   8
 931 #define IPVS_SYNC_QLEN_MAX      (IPVS_SYNC_WAKEUP_RATE * 4)
 932 #define IPVS_SYNC_SEND_DELAY    (HZ / 50)
 933 #define IPVS_SYNC_CHECK_PERIOD  HZ
 934 #define IPVS_SYNC_FLUSH_TIME    (HZ * 2)
 935 #define IPVS_SYNC_PORTS_MAX     (1 << 6)
 936
 937 #ifdef CONFIG_SYSCTL
 938
 939 static inline int sysctl_sync_threshold(struct netns_ipvs *ipvs)
 940 {
 941         return ipvs->sysctl_sync_threshold[0];
 942 }
 943
 944 static inline int sysctl_sync_period(struct netns_ipvs *ipvs)
 945 {
 946         return ACCESS_ONCE(ipvs->sysctl_sync_threshold[1]);
 947 }
 948
 949 static inline unsigned int sysctl_sync_refresh_period(struct netns_ipvs *ipvs)
 950 {
 951         return ACCESS_ONCE(ipvs->sysctl_sync_refresh_period);
 952 }
 953
 954 static inline int sysctl_sync_retries(struct netns_ipvs *ipvs)
 955 {
 956         return ipvs->sysctl_sync_retries;
 957 }
 958
 959 static inline int sysctl_sync_ver(struct netns_ipvs *ipvs)
 960 {
 961         return ipvs->sysctl_sync_ver;
 962 }
 963
 964 static inline int sysctl_sync_ports(struct netns_ipvs *ipvs)
 965 {
 966         return ACCESS_ONCE(ipvs->sysctl_sync_ports);
 967 }
 968
 969 static inline int sysctl_sync_qlen_max(struct netns_ipvs *ipvs)
 970 {
 971         return ipvs->sysctl_sync_qlen_max;
 972 }
 973
 974 static inline int sysctl_sync_sock_size(struct netns_ipvs *ipvs)
 975 {
 976         return ipvs->sysctl_sync_sock_size;
 977 }
 978
 979 #else
 980
 981 static inline int sysctl_sync_threshold(struct netns_ipvs *ipvs)
 982 {
 983         return DEFAULT_SYNC_THRESHOLD;
 984 }
 985
 986 static inline int sysctl_sync_period(struct netns_ipvs *ipvs)
 987 {
 988         return DEFAULT_SYNC_PERIOD;
 989 }
 990
 991 static inline unsigned int sysctl_sync_refresh_period(struct netns_ipvs *ipvs)
 992 {
 993         return DEFAULT_SYNC_REFRESH_PERIOD;
 994 }
 995
 996 static inline int sysctl_sync_retries(struct netns_ipvs *ipvs)
 997 {
 998         return DEFAULT_SYNC_RETRIES & 3;
 999 }
1000
1001 static inline int sysctl_sync_ver(struct netns_ipvs *ipvs)
1002 {
1003         return DEFAULT_SYNC_VER;
1004 }
1005
1006 static inline int sysctl_sync_ports(struct netns_ipvs *ipvs)
1007 {
1008         return 1;
1009 }
1010
1011 static inline int sysctl_sync_qlen_max(struct netns_ipvs *ipvs)
1012 {
1013         return IPVS_SYNC_QLEN_MAX;
1014 }
1015
1016 static inline int sysctl_sync_sock_size(struct netns_ipvs *ipvs)
1017 {
1018         return 0;
1019 }
1020
1021 #endif
1022
1023 /*
1024  *      IPVS core functions
1025  *      (from ip_vs_core.c)
1026  */
1027 extern const char *ip_vs_proto_name(unsigned int proto);
1028 extern void ip_vs_init_hash_table(struct list_head *table, int rows);
1029 #define IP_VS_INIT_HASH_TABLE(t) ip_vs_init_hash_table((t), ARRAY_SIZE((t)))
1030
1031 #define IP_VS_APP_TYPE_FTP      1
1032
1033 /*
1034  *     ip_vs_conn handling functions
1035  *     (from ip_vs_conn.c)
1036  */
1037
1038 enum {
1039         IP_VS_DIR_INPUT = 0,
1040         IP_VS_DIR_OUTPUT,
1041         IP_VS_DIR_INPUT_ONLY,
1042         IP_VS_DIR_LAST,
1043 };
1044
1045 static inline void ip_vs_conn_fill_param(struct net *net, int af, int protocol,
1046                                          const union nf_inet_addr *caddr,
1047                                          __be16 cport,
1048                                          const union nf_inet_addr *vaddr,
1049                                          __be16 vport,
1050                                          struct ip_vs_conn_param *p)
1051 {
1052         p->net = net;
1053         p->af = af;
1054         p->protocol = protocol;
1055         p->caddr = caddr;
1056         p->cport = cport;
1057         p->vaddr = vaddr;
1058         p->vport = vport;
1059         p->pe = NULL;
1060         p->pe_data = NULL;
1061 }
1062
1063 struct ip_vs_conn *ip_vs_conn_in_get(const struct ip_vs_conn_param *p);
1064 struct ip_vs_conn *ip_vs_ct_in_get(const struct ip_vs_conn_param *p);
1065
1066 struct ip_vs_conn * ip_vs_conn_in_get_proto(int af, const struct sk_buff *skb,
1067                                             const struct ip_vs_iphdr *iph,
1068                                             unsigned int proto_off,
1069                                             int inverse);
1070
1071 struct ip_vs_conn *ip_vs_conn_out_get(const struct ip_vs_conn_param *p);
1072
1073 struct ip_vs_conn * ip_vs_conn_out_get_proto(int af, const struct sk_buff *skb,
1074                                              const struct ip_vs_iphdr *iph,
1075                                              unsigned int proto_off,
1076                                              int inverse);
1077
1078 /* put back the conn without restarting its timer */
1079 static inline void __ip_vs_conn_put(struct ip_vs_conn *cp)
1080 {
1081         atomic_dec(&cp->refcnt);
1082 }
1083 extern void ip_vs_conn_put(struct ip_vs_conn *cp);
1084 extern void ip_vs_conn_fill_cport(struct ip_vs_conn *cp, __be16 cport);
1085
1086 struct ip_vs_conn *ip_vs_conn_new(const struct ip_vs_conn_param *p,
1087                                   const union nf_inet_addr *daddr,
1088                                   __be16 dport, unsigned int flags,
1089                                   struct ip_vs_dest *dest, __u32 fwmark);
1090 extern void ip_vs_conn_expire_now(struct ip_vs_conn *cp);
1091
1092 extern const char * ip_vs_state_name(__u16 proto, int state);
1093
1094 extern void ip_vs_tcp_conn_listen(struct net *net, struct ip_vs_conn *cp);
1095 extern int ip_vs_check_template(struct ip_vs_conn *ct);
1096 extern void ip_vs_random_dropentry(struct net *net);
1097 extern int ip_vs_conn_init(void);
1098 extern void ip_vs_conn_cleanup(void);
1099
1100 static inline void ip_vs_control_del(struct ip_vs_conn *cp)
1101 {
1102         struct ip_vs_conn *ctl_cp = cp->control;
1103         if (!ctl_cp) {
1104                 IP_VS_ERR_BUF("request control DEL for uncontrolled: "
1105                               "%s:%d to %s:%d\n",
1106                               IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1107                               ntohs(cp->cport),
1108                               IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1109                               ntohs(cp->vport));
1110
1111                 return;
1112         }
1113
1114         IP_VS_DBG_BUF(7, "DELeting control for: "
1115                       "cp.dst=%s:%d ctl_cp.dst=%s:%d\n",
1116                       IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1117                       ntohs(cp->cport),
1118                       IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr),
1119                       ntohs(ctl_cp->cport));
1120
1121         cp->control = NULL;
1122         if (atomic_read(&ctl_cp->n_control) == 0) {
1123                 IP_VS_ERR_BUF("BUG control DEL with n=0 : "
1124                               "%s:%d to %s:%d\n",
1125                               IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1126                               ntohs(cp->cport),
1127                               IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1128                               ntohs(cp->vport));
1129
1130                 return;
1131         }
1132         atomic_dec(&ctl_cp->n_control);
1133 }
1134
1135 static inline void
1136 ip_vs_control_add(struct ip_vs_conn *cp, struct ip_vs_conn *ctl_cp)
1137 {
1138         if (cp->control) {
1139                 IP_VS_ERR_BUF("request control ADD for already controlled: "
1140                               "%s:%d to %s:%d\n",
1141                               IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1142                               ntohs(cp->cport),
1143                               IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1144                               ntohs(cp->vport));
1145
1146                 ip_vs_control_del(cp);
1147         }
1148
1149         IP_VS_DBG_BUF(7, "ADDing control for: "
1150                       "cp.dst=%s:%d ctl_cp.dst=%s:%d\n",
1151                       IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1152                       ntohs(cp->cport),
1153                       IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr),
1154                       ntohs(ctl_cp->cport));
1155
1156         cp->control = ctl_cp;
1157         atomic_inc(&ctl_cp->n_control);
1158 }
1159
1160 /*
1161  * IPVS netns init & cleanup functions
1162  */
1163 extern int ip_vs_estimator_net_init(struct net *net);
1164 extern int ip_vs_control_net_init(struct net *net);
1165 extern int ip_vs_protocol_net_init(struct net *net);
1166 extern int ip_vs_app_net_init(struct net *net);
1167 extern int ip_vs_conn_net_init(struct net *net);
1168 extern int ip_vs_sync_net_init(struct net *net);
1169 extern void ip_vs_conn_net_cleanup(struct net *net);
1170 extern void ip_vs_app_net_cleanup(struct net *net);
1171 extern void ip_vs_protocol_net_cleanup(struct net *net);
1172 extern void ip_vs_control_net_cleanup(struct net *net);
1173 extern void ip_vs_estimator_net_cleanup(struct net *net);
1174 extern void ip_vs_sync_net_cleanup(struct net *net);
1175 extern void ip_vs_service_net_cleanup(struct net *net);
1176
1177 /*
1178  *      IPVS application functions
1179  *      (from ip_vs_app.c)
1180  */
1181 #define IP_VS_APP_MAX_PORTS  8
1182 extern int register_ip_vs_app(struct net *net, struct ip_vs_app *app);
1183 extern void unregister_ip_vs_app(struct net *net, struct ip_vs_app *app);
1184 extern int ip_vs_bind_app(struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1185 extern void ip_vs_unbind_app(struct ip_vs_conn *cp);
1186 extern int register_ip_vs_app_inc(struct net *net, struct ip_vs_app *app,
1187                                   __u16 proto, __u16 port);
1188 extern int ip_vs_app_inc_get(struct ip_vs_app *inc);
1189 extern void ip_vs_app_inc_put(struct ip_vs_app *inc);
1190
1191 extern int ip_vs_app_pkt_out(struct ip_vs_conn *, struct sk_buff *skb);
1192 extern int ip_vs_app_pkt_in(struct ip_vs_conn *, struct sk_buff *skb);
1193
1194 void ip_vs_bind_pe(struct ip_vs_service *svc, struct ip_vs_pe *pe);
1195 void ip_vs_unbind_pe(struct ip_vs_service *svc);
1196 int register_ip_vs_pe(struct ip_vs_pe *pe);
1197 int unregister_ip_vs_pe(struct ip_vs_pe *pe);
1198 struct ip_vs_pe *ip_vs_pe_getbyname(const char *name);
1199 struct ip_vs_pe *__ip_vs_pe_getbyname(const char *pe_name);
1200
1201 /*
1202  * Use a #define to avoid all of module.h just for these trivial ops
1203  */
1204 #define ip_vs_pe_get(pe)                        \
1205         if (pe && pe->module)                   \
1206                 __module_get(pe->module);
1207
1208 #define ip_vs_pe_put(pe)                        \
1209         if (pe && pe->module)                   \
1210                 module_put(pe->module);
1211
1212 /*
1213  *      IPVS protocol functions (from ip_vs_proto.c)
1214  */
1215 extern int ip_vs_protocol_init(void);
1216 extern void ip_vs_protocol_cleanup(void);
1217 extern void ip_vs_protocol_timeout_change(struct netns_ipvs *ipvs, int flags);
1218 extern int *ip_vs_create_timeout_table(int *table, int size);
1219 extern int
1220 ip_vs_set_state_timeout(int *table, int num, const char *const *names,
1221                         const char *name, int to);
1222 extern void
1223 ip_vs_tcpudp_debug_packet(int af, struct ip_vs_protocol *pp,
1224                           const struct sk_buff *skb,
1225                           int offset, const char *msg);
1226
1227 extern struct ip_vs_protocol ip_vs_protocol_tcp;
1228 extern struct ip_vs_protocol ip_vs_protocol_udp;
1229 extern struct ip_vs_protocol ip_vs_protocol_icmp;
1230 extern struct ip_vs_protocol ip_vs_protocol_esp;
1231 extern struct ip_vs_protocol ip_vs_protocol_ah;
1232 extern struct ip_vs_protocol ip_vs_protocol_sctp;
1233
1234 /*
1235  *      Registering/unregistering scheduler functions
1236  *      (from ip_vs_sched.c)
1237  */
1238 extern int register_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
1239 extern int unregister_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
1240 extern int ip_vs_bind_scheduler(struct ip_vs_service *svc,
1241                                 struct ip_vs_scheduler *scheduler);
1242 extern int ip_vs_unbind_scheduler(struct ip_vs_service *svc);
1243 extern struct ip_vs_scheduler *ip_vs_scheduler_get(const char *sched_name);
1244 extern void ip_vs_scheduler_put(struct ip_vs_scheduler *scheduler);
1245 extern struct ip_vs_conn *
1246 ip_vs_schedule(struct ip_vs_service *svc, struct sk_buff *skb,
1247                struct ip_vs_proto_data *pd, int *ignored);
1248 extern int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb,
1249                         struct ip_vs_proto_data *pd);
1250
1251 extern void ip_vs_scheduler_err(struct ip_vs_service *svc, const char *msg);
1252
1253
1254 /*
1255  *      IPVS control data and functions (from ip_vs_ctl.c)
1256  */
1257 extern struct ip_vs_stats ip_vs_stats;
1258 extern int sysctl_ip_vs_sync_ver;
1259
1260 extern struct ip_vs_service *
1261 ip_vs_service_get(struct net *net, int af, __u32 fwmark, __u16 protocol,
1262                   const union nf_inet_addr *vaddr, __be16 vport);
1263
1264 static inline void ip_vs_service_put(struct ip_vs_service *svc)
1265 {
1266         atomic_dec(&svc->usecnt);
1267 }
1268
1269 extern struct ip_vs_dest *
1270 ip_vs_lookup_real_service(struct net *net, int af, __u16 protocol,
1271                           const union nf_inet_addr *daddr, __be16 dport);
1272
1273 extern int ip_vs_use_count_inc(void);
1274 extern void ip_vs_use_count_dec(void);
1275 extern int ip_vs_register_nl_ioctl(void);
1276 extern void ip_vs_unregister_nl_ioctl(void);
1277 extern int ip_vs_control_init(void);
1278 extern void ip_vs_control_cleanup(void);
1279 extern struct ip_vs_dest *
1280 ip_vs_find_dest(struct net *net, int af, const union nf_inet_addr *daddr,
1281                 __be16 dport, const union nf_inet_addr *vaddr, __be16 vport,
1282                 __u16 protocol, __u32 fwmark, __u32 flags);
1283 extern struct ip_vs_dest *ip_vs_try_bind_dest(struct ip_vs_conn *cp);
1284
1285
1286 /*
1287  *      IPVS sync daemon data and function prototypes
1288  *      (from ip_vs_sync.c)
1289  */
1290 extern int start_sync_thread(struct net *net, int state, char *mcast_ifn,
1291                              __u8 syncid);
1292 extern int stop_sync_thread(struct net *net, int state);
1293 extern void ip_vs_sync_conn(struct net *net, struct ip_vs_conn *cp, int pkts);
1294
1295
1296 /*
1297  *      IPVS rate estimator prototypes (from ip_vs_est.c)
1298  */
1299 extern void ip_vs_start_estimator(struct net *net, struct ip_vs_stats *stats);
1300 extern void ip_vs_stop_estimator(struct net *net, struct ip_vs_stats *stats);
1301 extern void ip_vs_zero_estimator(struct ip_vs_stats *stats);
1302 extern void ip_vs_read_estimator(struct ip_vs_stats_user *dst,
1303                                  struct ip_vs_stats *stats);
1304
1305 /*
1306  *      Various IPVS packet transmitters (from ip_vs_xmit.c)
1307  */
1308 extern int ip_vs_null_xmit
1309 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1310 extern int ip_vs_bypass_xmit
1311 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1312 extern int ip_vs_nat_xmit
1313 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1314 extern int ip_vs_tunnel_xmit
1315 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1316 extern int ip_vs_dr_xmit
1317 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1318 extern int ip_vs_icmp_xmit
1319 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp,
1320  int offset, unsigned int hooknum);
1321 extern void ip_vs_dst_reset(struct ip_vs_dest *dest);
1322
1323 #ifdef CONFIG_IP_VS_IPV6
1324 extern int ip_vs_bypass_xmit_v6
1325 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1326 extern int ip_vs_nat_xmit_v6
1327 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1328 extern int ip_vs_tunnel_xmit_v6
1329 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1330 extern int ip_vs_dr_xmit_v6
1331 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1332 extern int ip_vs_icmp_xmit_v6
1333 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp,
1334  int offset, unsigned int hooknum);
1335 #endif
1336
1337 #ifdef CONFIG_SYSCTL
1338 /*
1339  *      This is a simple mechanism to ignore packets when
1340  *      we are loaded. Just set ip_vs_drop_rate to 'n' and
1341  *      we start to drop 1/rate of the packets
1342  */
1343
1344 static inline int ip_vs_todrop(struct netns_ipvs *ipvs)
1345 {
1346         if (!ipvs->drop_rate)
1347                 return 0;
1348         if (--ipvs->drop_counter > 0)
1349                 return 0;
1350         ipvs->drop_counter = ipvs->drop_rate;
1351         return 1;
1352 }
1353 #else
1354 static inline int ip_vs_todrop(struct netns_ipvs *ipvs) { return 0; }
1355 #endif
1356
1357 /*
1358  *      ip_vs_fwd_tag returns the forwarding tag of the connection
1359  */
1360 #define IP_VS_FWD_METHOD(cp)  (cp->flags & IP_VS_CONN_F_FWD_MASK)
1361
1362 static inline char ip_vs_fwd_tag(struct ip_vs_conn *cp)
1363 {
1364         char fwd;
1365
1366         switch (IP_VS_FWD_METHOD(cp)) {
1367         case IP_VS_CONN_F_MASQ:
1368                 fwd = 'M'; break;
1369         case IP_VS_CONN_F_LOCALNODE:
1370                 fwd = 'L'; break;
1371         case IP_VS_CONN_F_TUNNEL:
1372                 fwd = 'T'; break;
1373         case IP_VS_CONN_F_DROUTE:
1374                 fwd = 'R'; break;
1375         case IP_VS_CONN_F_BYPASS:
1376                 fwd = 'B'; break;
1377         default:
1378                 fwd = '?'; break;
1379         }
1380         return fwd;
1381 }
1382
1383 extern void ip_vs_nat_icmp(struct sk_buff *skb, struct ip_vs_protocol *pp,
1384                            struct ip_vs_conn *cp, int dir);
1385
1386 #ifdef CONFIG_IP_VS_IPV6
1387 extern void ip_vs_nat_icmp_v6(struct sk_buff *skb, struct ip_vs_protocol *pp,
1388                               struct ip_vs_conn *cp, int dir);
1389 #endif
1390
1391 extern __sum16 ip_vs_checksum_complete(struct sk_buff *skb, int offset);
1392
1393 static inline __wsum ip_vs_check_diff4(__be32 old, __be32 new, __wsum oldsum)
1394 {
1395         __be32 diff[2] = { ~old, new };
1396
1397         return csum_partial(diff, sizeof(diff), oldsum);
1398 }
1399
1400 #ifdef CONFIG_IP_VS_IPV6
1401 static inline __wsum ip_vs_check_diff16(const __be32 *old, const __be32 *new,
1402                                         __wsum oldsum)
1403 {
1404         __be32 diff[8] = { ~old[3], ~old[2], ~old[1], ~old[0],
1405                             new[3],  new[2],  new[1],  new[0] };
1406
1407         return csum_partial(diff, sizeof(diff), oldsum);
1408 }
1409 #endif
1410
1411 static inline __wsum ip_vs_check_diff2(__be16 old, __be16 new, __wsum oldsum)
1412 {
1413         __be16 diff[2] = { ~old, new };
1414
1415         return csum_partial(diff, sizeof(diff), oldsum);
1416 }
1417
1418 /*
1419  * Forget current conntrack (unconfirmed) and attach notrack entry
1420  */
1421 static inline void ip_vs_notrack(struct sk_buff *skb)
1422 {
1423 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
1424         enum ip_conntrack_info ctinfo;
1425         struct nf_conn *ct = nf_ct_get(skb, &ctinfo);
1426
1427         if (!ct || !nf_ct_is_untracked(ct)) {
1428                 nf_conntrack_put(skb->nfct);
1429                 skb->nfct = &nf_ct_untracked_get()->ct_general;
1430                 skb->nfctinfo = IP_CT_NEW;
1431                 nf_conntrack_get(skb->nfct);
1432         }
1433 #endif
1434 }
1435
1436 #ifdef CONFIG_IP_VS_NFCT
1437 /*
1438  *      Netfilter connection tracking
1439  *      (from ip_vs_nfct.c)
1440  */
1441 static inline int ip_vs_conntrack_enabled(struct netns_ipvs *ipvs)
1442 {
1443 #ifdef CONFIG_SYSCTL
1444         return ipvs->sysctl_conntrack;
1445 #else
1446         return 0;
1447 #endif
1448 }
1449
1450 extern void ip_vs_update_conntrack(struct sk_buff *skb, struct ip_vs_conn *cp,
1451                                    int outin);
1452 extern int ip_vs_confirm_conntrack(struct sk_buff *skb);
1453 extern void ip_vs_nfct_expect_related(struct sk_buff *skb, struct nf_conn *ct,
1454                                       struct ip_vs_conn *cp, u_int8_t proto,
1455                                       const __be16 port, int from_rs);
1456 extern void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp);
1457
1458 #else
1459
1460 static inline int ip_vs_conntrack_enabled(struct netns_ipvs *ipvs)
1461 {
1462         return 0;
1463 }
1464
1465 static inline void ip_vs_update_conntrack(struct sk_buff *skb,
1466                                           struct ip_vs_conn *cp, int outin)
1467 {
1468 }
1469
1470 static inline int ip_vs_confirm_conntrack(struct sk_buff *skb)
1471 {
1472         return NF_ACCEPT;
1473 }
1474
1475 static inline void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp)
1476 {
1477 }
1478 /* CONFIG_IP_VS_NFCT */
1479 #endif
1480
1481 static inline unsigned int
1482 ip_vs_dest_conn_overhead(struct ip_vs_dest *dest)
1483 {
1484         /*
1485          * We think the overhead of processing active connections is 256
1486          * times higher than that of inactive connections in average. (This
1487          * 256 times might not be accurate, we will change it later) We
1488          * use the following formula to estimate the overhead now:
1489          *                dest->activeconns*256 + dest->inactconns
1490          */
1491         return (atomic_read(&dest->activeconns) << 8) +
1492                 atomic_read(&dest->inactconns);
1493 }
1494
1495 #endif  /* _NET_IP_VS_H */