include/net/ip_vs.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   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/refcount.h>             /* for struct refcount_t */
  17
  18 #include <linux/compiler.h>
  19 #include <linux/timer.h>
  20 #include <linux/bug.h>
  21
  22 #include <net/checksum.h>
  23 #include <linux/netfilter.h>            /* for union nf_inet_addr */
  24 #include <linux/ip.h>
  25 #include <linux/ipv6.h>                 /* for struct ipv6hdr */
  26 #include <net/ipv6.h>
  27 #if IS_ENABLED(CONFIG_IP_VS_IPV6)
  28 #include <linux/netfilter_ipv6/ip6_tables.h>
  29 #endif
  30 #if IS_ENABLED(CONFIG_NF_CONNTRACK)
  31 #include <net/netfilter/nf_conntrack.h>
  32 #endif
  33 #include <net/net_namespace.h>          /* Netw namespace */
  34
  35 #define IP_VS_HDR_INVERSE       1
  36 #define IP_VS_HDR_ICMP          2
  37
  38 /* Generic access of ipvs struct */
  39 static inline struct netns_ipvs *net_ipvs(struct net* net)
  40 {
  41         return net->ipvs;
  42 }
  43
  44 /* This one needed for single_open_net since net is stored directly in
  45  * private not as a struct i.e. seq_file_net can't be used.
  46  */
  47 static inline struct net *seq_file_single_net(struct seq_file *seq)
  48 {
  49 #ifdef CONFIG_NET_NS
  50         return (struct net *)seq->private;
  51 #else
  52         return &init_net;
  53 #endif
  54 }
  55
  56 /* Connections' size value needed by ip_vs_ctl.c */
  57 extern int ip_vs_conn_tab_size;
  58
  59 struct ip_vs_iphdr {
  60         int hdr_flags;  /* ipvs flags */
  61         __u32 off;      /* Where IP or IPv4 header starts */
  62         __u32 len;      /* IPv4 simply where L4 starts
  63                          * IPv6 where L4 Transport Header starts */
  64         __u16 fragoffs; /* IPv6 fragment offset, 0 if first frag (or not frag)*/
  65         __s16 protocol;
  66         __s32 flags;
  67         union nf_inet_addr saddr;
  68         union nf_inet_addr daddr;
  69 };
  70
  71 static inline void *frag_safe_skb_hp(const struct sk_buff *skb, int offset,
  72                                       int len, void *buffer)
  73 {
  74         return skb_header_pointer(skb, offset, len, buffer);
  75 }
  76
  77 /* This function handles filling *ip_vs_iphdr, both for IPv4 and IPv6.
  78  * IPv6 requires some extra work, as finding proper header position,
  79  * depend on the IPv6 extension headers.
  80  */
  81 static inline int
  82 ip_vs_fill_iph_skb_off(int af, const struct sk_buff *skb, int offset,
  83                        int hdr_flags, struct ip_vs_iphdr *iphdr)
  84 {
  85         iphdr->hdr_flags = hdr_flags;
  86         iphdr->off = offset;
  87
  88 #ifdef CONFIG_IP_VS_IPV6
  89         if (af == AF_INET6) {
  90                 struct ipv6hdr _iph;
  91                 const struct ipv6hdr *iph = skb_header_pointer(
  92                         skb, offset, sizeof(_iph), &_iph);
  93                 if (!iph)
  94                         return 0;
  95
  96                 iphdr->saddr.in6 = iph->saddr;
  97                 iphdr->daddr.in6 = iph->daddr;
  98                 /* ipv6_find_hdr() updates len, flags */
  99                 iphdr->len       = offset;
 100                 iphdr->flags     = 0;
 101                 iphdr->protocol  = ipv6_find_hdr(skb, &iphdr->len, -1,
 102                                                  &iphdr->fragoffs,
 103                                                  &iphdr->flags);
 104                 if (iphdr->protocol < 0)
 105                         return 0;
 106         } else
 107 #endif
 108         {
 109                 struct iphdr _iph;
 110                 const struct iphdr *iph = skb_header_pointer(
 111                         skb, offset, sizeof(_iph), &_iph);
 112                 if (!iph)
 113                         return 0;
 114
 115                 iphdr->len      = offset + iph->ihl * 4;
 116                 iphdr->fragoffs = 0;
 117                 iphdr->protocol = iph->protocol;
 118                 iphdr->saddr.ip = iph->saddr;
 119                 iphdr->daddr.ip = iph->daddr;
 120         }
 121
 122         return 1;
 123 }
 124
 125 static inline int
 126 ip_vs_fill_iph_skb_icmp(int af, const struct sk_buff *skb, int offset,
 127                         bool inverse, struct ip_vs_iphdr *iphdr)
 128 {
 129         int hdr_flags = IP_VS_HDR_ICMP;
 130
 131         if (inverse)
 132                 hdr_flags |= IP_VS_HDR_INVERSE;
 133
 134         return ip_vs_fill_iph_skb_off(af, skb, offset, hdr_flags, iphdr);
 135 }
 136
 137 static inline int
 138 ip_vs_fill_iph_skb(int af, const struct sk_buff *skb, bool inverse,
 139                    struct ip_vs_iphdr *iphdr)
 140 {
 141         int hdr_flags = 0;
 142
 143         if (inverse)
 144                 hdr_flags |= IP_VS_HDR_INVERSE;
 145
 146         return ip_vs_fill_iph_skb_off(af, skb, skb_network_offset(skb),
 147                                       hdr_flags, iphdr);
 148 }
 149
 150 static inline bool
 151 ip_vs_iph_inverse(const struct ip_vs_iphdr *iph)
 152 {
 153         return !!(iph->hdr_flags & IP_VS_HDR_INVERSE);
 154 }
 155
 156 static inline bool
 157 ip_vs_iph_icmp(const struct ip_vs_iphdr *iph)
 158 {
 159         return !!(iph->hdr_flags & IP_VS_HDR_ICMP);
 160 }
 161
 162 static inline void ip_vs_addr_copy(int af, union nf_inet_addr *dst,
 163                                    const union nf_inet_addr *src)
 164 {
 165 #ifdef CONFIG_IP_VS_IPV6
 166         if (af == AF_INET6)
 167                 dst->in6 = src->in6;
 168         else
 169 #endif
 170         dst->ip = src->ip;
 171 }
 172
 173 static inline void ip_vs_addr_set(int af, union nf_inet_addr *dst,
 174                                   const union nf_inet_addr *src)
 175 {
 176 #ifdef CONFIG_IP_VS_IPV6
 177         if (af == AF_INET6) {
 178                 dst->in6 = src->in6;
 179                 return;
 180         }
 181 #endif
 182         dst->ip = src->ip;
 183         dst->all[1] = 0;
 184         dst->all[2] = 0;
 185         dst->all[3] = 0;
 186 }
 187
 188 static inline int ip_vs_addr_equal(int af, const union nf_inet_addr *a,
 189                                    const union nf_inet_addr *b)
 190 {
 191 #ifdef CONFIG_IP_VS_IPV6
 192         if (af == AF_INET6)
 193                 return ipv6_addr_equal(&a->in6, &b->in6);
 194 #endif
 195         return a->ip == b->ip;
 196 }
 197
 198 #ifdef CONFIG_IP_VS_DEBUG
 199 #include <linux/net.h>
 200
 201 int ip_vs_get_debug_level(void);
 202
 203 static inline const char *ip_vs_dbg_addr(int af, char *buf, size_t buf_len,
 204                                          const union nf_inet_addr *addr,
 205                                          int *idx)
 206 {
 207         int len;
 208 #ifdef CONFIG_IP_VS_IPV6
 209         if (af == AF_INET6)
 210                 len = snprintf(&buf[*idx], buf_len - *idx, "[%pI6c]",
 211                                &addr->in6) + 1;
 212         else
 213 #endif
 214                 len = snprintf(&buf[*idx], buf_len - *idx, "%pI4",
 215                                &addr->ip) + 1;
 216
 217         *idx += len;
 218         BUG_ON(*idx > buf_len + 1);
 219         return &buf[*idx - len];
 220 }
 221
 222 #define IP_VS_DBG_BUF(level, msg, ...)                                  \
 223         do {                                                            \
 224                 char ip_vs_dbg_buf[160];                                \
 225                 int ip_vs_dbg_idx = 0;                                  \
 226                 if (level <= ip_vs_get_debug_level())                   \
 227                         printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__);  \
 228         } while (0)
 229 #define IP_VS_ERR_BUF(msg...)                                           \
 230         do {                                                            \
 231                 char ip_vs_dbg_buf[160];                                \
 232                 int ip_vs_dbg_idx = 0;                                  \
 233                 pr_err(msg);                                            \
 234         } while (0)
 235
 236 /* Only use from within IP_VS_DBG_BUF() or IP_VS_ERR_BUF macros */
 237 #define IP_VS_DBG_ADDR(af, addr)                                        \
 238         ip_vs_dbg_addr(af, ip_vs_dbg_buf,                               \
 239                        sizeof(ip_vs_dbg_buf), addr,                     \
 240                        &ip_vs_dbg_idx)
 241
 242 #define IP_VS_DBG(level, msg, ...)                                      \
 243         do {                                                            \
 244                 if (level <= ip_vs_get_debug_level())                   \
 245                         printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__);  \
 246         } while (0)
 247 #define IP_VS_DBG_RL(msg, ...)                                          \
 248         do {                                                            \
 249                 if (net_ratelimit())                                    \
 250                         printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__);  \
 251         } while (0)
 252 #define IP_VS_DBG_PKT(level, af, pp, skb, ofs, msg)                     \
 253         do {                                                            \
 254                 if (level <= ip_vs_get_debug_level())                   \
 255                         pp->debug_packet(af, pp, skb, ofs, msg);        \
 256         } while (0)
 257 #define IP_VS_DBG_RL_PKT(level, af, pp, skb, ofs, msg)                  \
 258         do {                                                            \
 259                 if (level <= ip_vs_get_debug_level() &&                 \
 260                     net_ratelimit())                                    \
 261                         pp->debug_packet(af, pp, skb, ofs, msg);        \
 262         } while (0)
 263 #else   /* NO DEBUGGING at ALL */
 264 #define IP_VS_DBG_BUF(level, msg...)  do {} while (0)
 265 #define IP_VS_ERR_BUF(msg...)  do {} while (0)
 266 #define IP_VS_DBG(level, msg...)  do {} while (0)
 267 #define IP_VS_DBG_RL(msg...)  do {} while (0)
 268 #define IP_VS_DBG_PKT(level, af, pp, skb, ofs, msg)     do {} while (0)
 269 #define IP_VS_DBG_RL_PKT(level, af, pp, skb, ofs, msg)  do {} while (0)
 270 #endif
 271
 272 #define IP_VS_BUG() BUG()
 273 #define IP_VS_ERR_RL(msg, ...)                                          \
 274         do {                                                            \
 275                 if (net_ratelimit())                                    \
 276                         pr_err(msg, ##__VA_ARGS__);                     \
 277         } while (0)
 278
 279 #ifdef CONFIG_IP_VS_DEBUG
 280 #define EnterFunction(level)                                            \
 281         do {                                                            \
 282                 if (level <= ip_vs_get_debug_level())                   \
 283                         printk(KERN_DEBUG                               \
 284                                pr_fmt("Enter: %s, %s line %i\n"),       \
 285                                __func__, __FILE__, __LINE__);           \
 286         } while (0)
 287 #define LeaveFunction(level)                                            \
 288         do {                                                            \
 289                 if (level <= ip_vs_get_debug_level())                   \
 290                         printk(KERN_DEBUG                               \
 291                                pr_fmt("Leave: %s, %s line %i\n"),       \
 292                                __func__, __FILE__, __LINE__);           \
 293         } while (0)
 294 #else
 295 #define EnterFunction(level)   do {} while (0)
 296 #define LeaveFunction(level)   do {} while (0)
 297 #endif
 298
 299 /* The port number of FTP service (in network order). */
 300 #define FTPPORT  cpu_to_be16(21)
 301 #define FTPDATA  cpu_to_be16(20)
 302
 303 /* TCP State Values */
 304 enum {
 305         IP_VS_TCP_S_NONE = 0,
 306         IP_VS_TCP_S_ESTABLISHED,
 307         IP_VS_TCP_S_SYN_SENT,
 308         IP_VS_TCP_S_SYN_RECV,
 309         IP_VS_TCP_S_FIN_WAIT,
 310         IP_VS_TCP_S_TIME_WAIT,
 311         IP_VS_TCP_S_CLOSE,
 312         IP_VS_TCP_S_CLOSE_WAIT,
 313         IP_VS_TCP_S_LAST_ACK,
 314         IP_VS_TCP_S_LISTEN,
 315         IP_VS_TCP_S_SYNACK,
 316         IP_VS_TCP_S_LAST
 317 };
 318
 319 /* UDP State Values */
 320 enum {
 321         IP_VS_UDP_S_NORMAL,
 322         IP_VS_UDP_S_LAST,
 323 };
 324
 325 /* ICMP State Values */
 326 enum {
 327         IP_VS_ICMP_S_NORMAL,
 328         IP_VS_ICMP_S_LAST,
 329 };
 330
 331 /* SCTP State Values */
 332 enum ip_vs_sctp_states {
 333         IP_VS_SCTP_S_NONE,
 334         IP_VS_SCTP_S_INIT1,
 335         IP_VS_SCTP_S_INIT,
 336         IP_VS_SCTP_S_COOKIE_SENT,
 337         IP_VS_SCTP_S_COOKIE_REPLIED,
 338         IP_VS_SCTP_S_COOKIE_WAIT,
 339         IP_VS_SCTP_S_COOKIE,
 340         IP_VS_SCTP_S_COOKIE_ECHOED,
 341         IP_VS_SCTP_S_ESTABLISHED,
 342         IP_VS_SCTP_S_SHUTDOWN_SENT,
 343         IP_VS_SCTP_S_SHUTDOWN_RECEIVED,
 344         IP_VS_SCTP_S_SHUTDOWN_ACK_SENT,
 345         IP_VS_SCTP_S_REJECTED,
 346         IP_VS_SCTP_S_CLOSED,
 347         IP_VS_SCTP_S_LAST
 348 };
 349
 350 /* Delta sequence info structure
 351  * Each ip_vs_conn has 2 (output AND input seq. changes).
 352  * Only used in the VS/NAT.
 353  */
 354 struct ip_vs_seq {
 355         __u32                   init_seq;       /* Add delta from this seq */
 356         __u32                   delta;          /* Delta in sequence numbers */
 357         __u32                   previous_delta; /* Delta in sequence numbers
 358                                                  * before last resized pkt */
 359 };
 360
 361 /* counters per cpu */
 362 struct ip_vs_counters {
 363         __u64           conns;          /* connections scheduled */
 364         __u64           inpkts;         /* incoming packets */
 365         __u64           outpkts;        /* outgoing packets */
 366         __u64           inbytes;        /* incoming bytes */
 367         __u64           outbytes;       /* outgoing bytes */
 368 };
 369 /* Stats per cpu */
 370 struct ip_vs_cpu_stats {
 371         struct ip_vs_counters   cnt;
 372         struct u64_stats_sync   syncp;
 373 };
 374
 375 /* IPVS statistics objects */
 376 struct ip_vs_estimator {
 377         struct list_head        list;
 378
 379         u64                     last_inbytes;
 380         u64                     last_outbytes;
 381         u64                     last_conns;
 382         u64                     last_inpkts;
 383         u64                     last_outpkts;
 384
 385         u64                     cps;
 386         u64                     inpps;
 387         u64                     outpps;
 388         u64                     inbps;
 389         u64                     outbps;
 390 };
 391
 392 /*
 393  * IPVS statistics object, 64-bit kernel version of struct ip_vs_stats_user
 394  */
 395 struct ip_vs_kstats {
 396         u64                     conns;          /* connections scheduled */
 397         u64                     inpkts;         /* incoming packets */
 398         u64                     outpkts;        /* outgoing packets */
 399         u64                     inbytes;        /* incoming bytes */
 400         u64                     outbytes;       /* outgoing bytes */
 401
 402         u64                     cps;            /* current connection rate */
 403         u64                     inpps;          /* current in packet rate */
 404         u64                     outpps;         /* current out packet rate */
 405         u64                     inbps;          /* current in byte rate */
 406         u64                     outbps;         /* current out byte rate */
 407 };
 408
 409 struct ip_vs_stats {
 410         struct ip_vs_kstats     kstats;         /* kernel statistics */
 411         struct ip_vs_estimator  est;            /* estimator */
 412         struct ip_vs_cpu_stats __percpu *cpustats;      /* per cpu counters */
 413         spinlock_t              lock;           /* spin lock */
 414         struct ip_vs_kstats     kstats0;        /* reset values */
 415 };
 416
 417 struct dst_entry;
 418 struct iphdr;
 419 struct ip_vs_conn;
 420 struct ip_vs_app;
 421 struct sk_buff;
 422 struct ip_vs_proto_data;
 423
 424 struct ip_vs_protocol {
 425         struct ip_vs_protocol   *next;
 426         char                    *name;
 427         u16                     protocol;
 428         u16                     num_states;
 429         int                     dont_defrag;
 430
 431         void (*init)(struct ip_vs_protocol *pp);
 432
 433         void (*exit)(struct ip_vs_protocol *pp);
 434
 435         int (*init_netns)(struct netns_ipvs *ipvs, struct ip_vs_proto_data *pd);
 436
 437         void (*exit_netns)(struct netns_ipvs *ipvs, struct ip_vs_proto_data *pd);
 438
 439         int (*conn_schedule)(struct netns_ipvs *ipvs,
 440                              int af, struct sk_buff *skb,
 441                              struct ip_vs_proto_data *pd,
 442                              int *verdict, struct ip_vs_conn **cpp,
 443                              struct ip_vs_iphdr *iph);
 444
 445         struct ip_vs_conn *
 446         (*conn_in_get)(struct netns_ipvs *ipvs,
 447                        int af,
 448                        const struct sk_buff *skb,
 449                        const struct ip_vs_iphdr *iph);
 450
 451         struct ip_vs_conn *
 452         (*conn_out_get)(struct netns_ipvs *ipvs,
 453                         int af,
 454                         const struct sk_buff *skb,
 455                         const struct ip_vs_iphdr *iph);
 456
 457         int (*snat_handler)(struct sk_buff *skb, struct ip_vs_protocol *pp,
 458                             struct ip_vs_conn *cp, struct ip_vs_iphdr *iph);
 459
 460         int (*dnat_handler)(struct sk_buff *skb, struct ip_vs_protocol *pp,
 461                             struct ip_vs_conn *cp, struct ip_vs_iphdr *iph);
 462
 463         int (*csum_check)(int af, struct sk_buff *skb,
 464                           struct ip_vs_protocol *pp);
 465
 466         const char *(*state_name)(int state);
 467
 468         void (*state_transition)(struct ip_vs_conn *cp, int direction,
 469                                  const struct sk_buff *skb,
 470                                  struct ip_vs_proto_data *pd);
 471
 472         int (*register_app)(struct netns_ipvs *ipvs, struct ip_vs_app *inc);
 473
 474         void (*unregister_app)(struct netns_ipvs *ipvs, struct ip_vs_app *inc);
 475
 476         int (*app_conn_bind)(struct ip_vs_conn *cp);
 477
 478         void (*debug_packet)(int af, struct ip_vs_protocol *pp,
 479                              const struct sk_buff *skb,
 480                              int offset,
 481                              const char *msg);
 482
 483         void (*timeout_change)(struct ip_vs_proto_data *pd, int flags);
 484 };
 485
 486 /* protocol data per netns */
 487 struct ip_vs_proto_data {
 488         struct ip_vs_proto_data *next;
 489         struct ip_vs_protocol   *pp;
 490         int                     *timeout_table; /* protocol timeout table */
 491         atomic_t                appcnt;         /* counter of proto app incs. */
 492         struct tcp_states_t     *tcp_state_table;
 493 };
 494
 495 struct ip_vs_protocol   *ip_vs_proto_get(unsigned short proto);
 496 struct ip_vs_proto_data *ip_vs_proto_data_get(struct netns_ipvs *ipvs,
 497                                               unsigned short proto);
 498
 499 struct ip_vs_conn_param {
 500         struct netns_ipvs               *ipvs;
 501         const union nf_inet_addr        *caddr;
 502         const union nf_inet_addr        *vaddr;
 503         __be16                          cport;
 504         __be16                          vport;
 505         __u16                           protocol;
 506         u16                             af;
 507
 508         const struct ip_vs_pe           *pe;
 509         char                            *pe_data;
 510         __u8                            pe_data_len;
 511 };
 512
 513 /* IP_VS structure allocated for each dynamically scheduled connection */
 514 struct ip_vs_conn {
 515         struct hlist_node       c_list;         /* hashed list heads */
 516         /* Protocol, addresses and port numbers */
 517         __be16                  cport;
 518         __be16                  dport;
 519         __be16                  vport;
 520         u16                     af;             /* address family */
 521         union nf_inet_addr      caddr;          /* client address */
 522         union nf_inet_addr      vaddr;          /* virtual address */
 523         union nf_inet_addr      daddr;          /* destination address */
 524         volatile __u32          flags;          /* status flags */
 525         __u16                   protocol;       /* Which protocol (TCP/UDP) */
 526         __u16                   daf;            /* Address family of the dest */
 527         struct netns_ipvs       *ipvs;
 528
 529         /* counter and timer */
 530         refcount_t              refcnt;         /* reference count */
 531         struct timer_list       timer;          /* Expiration timer */
 532         volatile unsigned long  timeout;        /* timeout */
 533
 534         /* Flags and state transition */
 535         spinlock_t              lock;           /* lock for state transition */
 536         volatile __u16          state;          /* state info */
 537         volatile __u16          old_state;      /* old state, to be used for
 538                                                  * state transition triggerd
 539                                                  * synchronization
 540                                                  */
 541         __u32                   fwmark;         /* Fire wall mark from skb */
 542         unsigned long           sync_endtime;   /* jiffies + sent_retries */
 543
 544         /* Control members */
 545         struct ip_vs_conn       *control;       /* Master control connection */
 546         atomic_t                n_control;      /* Number of controlled ones */
 547         struct ip_vs_dest       *dest;          /* real server */
 548         atomic_t                in_pkts;        /* incoming packet counter */
 549
 550         /* Packet transmitter for different forwarding methods.  If it
 551          * mangles the packet, it must return NF_DROP or better NF_STOLEN,
 552          * otherwise this must be changed to a sk_buff **.
 553          * NF_ACCEPT can be returned when destination is local.
 554          */
 555         int (*packet_xmit)(struct sk_buff *skb, struct ip_vs_conn *cp,
 556                            struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
 557
 558         /* Note: we can group the following members into a structure,
 559          * in order to save more space, and the following members are
 560          * only used in VS/NAT anyway
 561          */
 562         struct ip_vs_app        *app;           /* bound ip_vs_app object */
 563         void                    *app_data;      /* Application private data */
 564         struct ip_vs_seq        in_seq;         /* incoming seq. struct */
 565         struct ip_vs_seq        out_seq;        /* outgoing seq. struct */
 566
 567         const struct ip_vs_pe   *pe;
 568         char                    *pe_data;
 569         __u8                    pe_data_len;
 570
 571         struct rcu_head         rcu_head;
 572 };
 573
 574 /* Extended internal versions of struct ip_vs_service_user and ip_vs_dest_user
 575  * for IPv6 support.
 576  *
 577  * We need these to conveniently pass around service and destination
 578  * options, but unfortunately, we also need to keep the old definitions to
 579  * maintain userspace backwards compatibility for the setsockopt interface.
 580  */
 581 struct ip_vs_service_user_kern {
 582         /* virtual service addresses */
 583         u16                     af;
 584         u16                     protocol;
 585         union nf_inet_addr      addr;           /* virtual ip address */
 586         __be16                  port;
 587         u32                     fwmark;         /* firwall mark of service */
 588
 589         /* virtual service options */
 590         char                    *sched_name;
 591         char                    *pe_name;
 592         unsigned int            flags;          /* virtual service flags */
 593         unsigned int            timeout;        /* persistent timeout in sec */
 594         __be32                  netmask;        /* persistent netmask or plen */
 595 };
 596
 597
 598 struct ip_vs_dest_user_kern {
 599         /* destination server address */
 600         union nf_inet_addr      addr;
 601         __be16                  port;
 602
 603         /* real server options */
 604         unsigned int            conn_flags;     /* connection flags */
 605         int                     weight;         /* destination weight */
 606
 607         /* thresholds for active connections */
 608         u32                     u_threshold;    /* upper threshold */
 609         u32                     l_threshold;    /* lower threshold */
 610
 611         /* Address family of addr */
 612         u16                     af;
 613 };
 614
 615
 616 /*
 617  * The information about the virtual service offered to the net and the
 618  * forwarding entries.
 619  */
 620 struct ip_vs_service {
 621         struct hlist_node       s_list;   /* for normal service table */
 622         struct hlist_node       f_list;   /* for fwmark-based service table */
 623         atomic_t                refcnt;   /* reference counter */
 624
 625         u16                     af;       /* address family */
 626         __u16                   protocol; /* which protocol (TCP/UDP) */
 627         union nf_inet_addr      addr;     /* IP address for virtual service */
 628         __be16                  port;     /* port number for the service */
 629         __u32                   fwmark;   /* firewall mark of the service */
 630         unsigned int            flags;    /* service status flags */
 631         unsigned int            timeout;  /* persistent timeout in ticks */
 632         __be32                  netmask;  /* grouping granularity, mask/plen */
 633         struct netns_ipvs       *ipvs;
 634
 635         struct list_head        destinations;  /* real server d-linked list */
 636         __u32                   num_dests;     /* number of servers */
 637         struct ip_vs_stats      stats;         /* statistics for the service */
 638
 639         /* for scheduling */
 640         struct ip_vs_scheduler __rcu *scheduler; /* bound scheduler object */
 641         spinlock_t              sched_lock;    /* lock sched_data */
 642         void                    *sched_data;   /* scheduler application data */
 643
 644         /* alternate persistence engine */
 645         struct ip_vs_pe __rcu   *pe;
 646
 647         struct rcu_head         rcu_head;
 648 };
 649
 650 /* Information for cached dst */
 651 struct ip_vs_dest_dst {
 652         struct dst_entry        *dst_cache;     /* destination cache entry */
 653         u32                     dst_cookie;
 654         union nf_inet_addr      dst_saddr;
 655         struct rcu_head         rcu_head;
 656 };
 657
 658 /* The real server destination forwarding entry with ip address, port number,
 659  * and so on.
 660  */
 661 struct ip_vs_dest {
 662         struct list_head        n_list;   /* for the dests in the service */
 663         struct hlist_node       d_list;   /* for table with all the dests */
 664
 665         u16                     af;             /* address family */
 666         __be16                  port;           /* port number of the server */
 667         union nf_inet_addr      addr;           /* IP address of the server */
 668         volatile unsigned int   flags;          /* dest status flags */
 669         atomic_t                conn_flags;     /* flags to copy to conn */
 670         atomic_t                weight;         /* server weight */
 671
 672         refcount_t              refcnt;         /* reference counter */
 673         struct ip_vs_stats      stats;          /* statistics */
 674         unsigned long           idle_start;     /* start time, jiffies */
 675
 676         /* connection counters and thresholds */
 677         atomic_t                activeconns;    /* active connections */
 678         atomic_t                inactconns;     /* inactive connections */
 679         atomic_t                persistconns;   /* persistent connections */
 680         __u32                   u_threshold;    /* upper threshold */
 681         __u32                   l_threshold;    /* lower threshold */
 682
 683         /* for destination cache */
 684         spinlock_t              dst_lock;       /* lock of dst_cache */
 685         struct ip_vs_dest_dst __rcu *dest_dst;  /* cached dst info */
 686
 687         /* for virtual service */
 688         struct ip_vs_service __rcu *svc;        /* service it belongs to */
 689         __u16                   protocol;       /* which protocol (TCP/UDP) */
 690         __be16                  vport;          /* virtual port number */
 691         union nf_inet_addr      vaddr;          /* virtual IP address */
 692         __u32                   vfwmark;        /* firewall mark of service */
 693
 694         struct list_head        t_list;         /* in dest_trash */
 695         unsigned int            in_rs_table:1;  /* we are in rs_table */
 696 };
 697
 698 /* The scheduler object */
 699 struct ip_vs_scheduler {
 700         struct list_head        n_list;         /* d-linked list head */
 701         char                    *name;          /* scheduler name */
 702         atomic_t                refcnt;         /* reference counter */
 703         struct module           *module;        /* THIS_MODULE/NULL */
 704
 705         /* scheduler initializing service */
 706         int (*init_service)(struct ip_vs_service *svc);
 707         /* scheduling service finish */
 708         void (*done_service)(struct ip_vs_service *svc);
 709         /* dest is linked */
 710         int (*add_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest);
 711         /* dest is unlinked */
 712         int (*del_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest);
 713         /* dest is updated */
 714         int (*upd_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest);
 715
 716         /* selecting a server from the given service */
 717         struct ip_vs_dest* (*schedule)(struct ip_vs_service *svc,
 718                                        const struct sk_buff *skb,
 719                                        struct ip_vs_iphdr *iph);
 720 };
 721
 722 /* The persistence engine object */
 723 struct ip_vs_pe {
 724         struct list_head        n_list;         /* d-linked list head */
 725         char                    *name;          /* scheduler name */
 726         atomic_t                refcnt;         /* reference counter */
 727         struct module           *module;        /* THIS_MODULE/NULL */
 728
 729         /* get the connection template, if any */
 730         int (*fill_param)(struct ip_vs_conn_param *p, struct sk_buff *skb);
 731         bool (*ct_match)(const struct ip_vs_conn_param *p,
 732                          struct ip_vs_conn *ct);
 733         u32 (*hashkey_raw)(const struct ip_vs_conn_param *p, u32 initval,
 734                            bool inverse);
 735         int (*show_pe_data)(const struct ip_vs_conn *cp, char *buf);
 736         /* create connections for real-server outgoing packets */
 737         struct ip_vs_conn* (*conn_out)(struct ip_vs_service *svc,
 738                                        struct ip_vs_dest *dest,
 739                                        struct sk_buff *skb,
 740                                        const struct ip_vs_iphdr *iph,
 741                                        __be16 dport, __be16 cport);
 742 };
 743
 744 /* The application module object (a.k.a. app incarnation) */
 745 struct ip_vs_app {
 746         struct list_head        a_list;         /* member in app list */
 747         int                     type;           /* IP_VS_APP_TYPE_xxx */
 748         char                    *name;          /* application module name */
 749         __u16                   protocol;
 750         struct module           *module;        /* THIS_MODULE/NULL */
 751         struct list_head        incs_list;      /* list of incarnations */
 752
 753         /* members for application incarnations */
 754         struct list_head        p_list;         /* member in proto app list */
 755         struct ip_vs_app        *app;           /* its real application */
 756         __be16                  port;           /* port number in net order */
 757         atomic_t                usecnt;         /* usage counter */
 758         struct rcu_head         rcu_head;
 759
 760         /* output hook: Process packet in inout direction, diff set for TCP.
 761          * Return: 0=Error, 1=Payload Not Mangled/Mangled but checksum is ok,
 762          *         2=Mangled but checksum was not updated
 763          */
 764         int (*pkt_out)(struct ip_vs_app *, struct ip_vs_conn *,
 765                        struct sk_buff *, int *diff);
 766
 767         /* input hook: Process packet in outin direction, diff set for TCP.
 768          * Return: 0=Error, 1=Payload Not Mangled/Mangled but checksum is ok,
 769          *         2=Mangled but checksum was not updated
 770          */
 771         int (*pkt_in)(struct ip_vs_app *, struct ip_vs_conn *,
 772                       struct sk_buff *, int *diff);
 773
 774         /* ip_vs_app initializer */
 775         int (*init_conn)(struct ip_vs_app *, struct ip_vs_conn *);
 776
 777         /* ip_vs_app finish */
 778         int (*done_conn)(struct ip_vs_app *, struct ip_vs_conn *);
 779
 780
 781         /* not used now */
 782         int (*bind_conn)(struct ip_vs_app *, struct ip_vs_conn *,
 783                          struct ip_vs_protocol *);
 784
 785         void (*unbind_conn)(struct ip_vs_app *, struct ip_vs_conn *);
 786
 787         int *                   timeout_table;
 788         int *                   timeouts;
 789         int                     timeouts_size;
 790
 791         int (*conn_schedule)(struct sk_buff *skb, struct ip_vs_app *app,
 792                              int *verdict, struct ip_vs_conn **cpp);
 793
 794         struct ip_vs_conn *
 795         (*conn_in_get)(const struct sk_buff *skb, struct ip_vs_app *app,
 796                        const struct iphdr *iph, int inverse);
 797
 798         struct ip_vs_conn *
 799         (*conn_out_get)(const struct sk_buff *skb, struct ip_vs_app *app,
 800                         const struct iphdr *iph, int inverse);
 801
 802         int (*state_transition)(struct ip_vs_conn *cp, int direction,
 803                                 const struct sk_buff *skb,
 804                                 struct ip_vs_app *app);
 805
 806         void (*timeout_change)(struct ip_vs_app *app, int flags);
 807 };
 808
 809 struct ipvs_master_sync_state {
 810         struct list_head        sync_queue;
 811         struct ip_vs_sync_buff  *sync_buff;
 812         unsigned long           sync_queue_len;
 813         unsigned int            sync_queue_delay;
 814         struct task_struct      *master_thread;
 815         struct delayed_work     master_wakeup_work;
 816         struct netns_ipvs       *ipvs;
 817 };
 818
 819 /* How much time to keep dests in trash */
 820 #define IP_VS_DEST_TRASH_PERIOD         (120 * HZ)
 821
 822 struct ipvs_sync_daemon_cfg {
 823         union nf_inet_addr      mcast_group;
 824         int                     syncid;
 825         u16                     sync_maxlen;
 826         u16                     mcast_port;
 827         u8                      mcast_af;
 828         u8                      mcast_ttl;
 829         /* multicast interface name */
 830         char                    mcast_ifn[IP_VS_IFNAME_MAXLEN];
 831 };
 832
 833 /* IPVS in network namespace */
 834 struct netns_ipvs {
 835         int                     gen;            /* Generation */
 836         int                     enable;         /* enable like nf_hooks do */
 837         /* Hash table: for real service lookups */
 838         #define IP_VS_RTAB_BITS 4
 839         #define IP_VS_RTAB_SIZE (1 << IP_VS_RTAB_BITS)
 840         #define IP_VS_RTAB_MASK (IP_VS_RTAB_SIZE - 1)
 841
 842         struct hlist_head       rs_table[IP_VS_RTAB_SIZE];
 843         /* ip_vs_app */
 844         struct list_head        app_list;
 845         /* ip_vs_proto */
 846         #define IP_VS_PROTO_TAB_SIZE    32      /* must be power of 2 */
 847         struct ip_vs_proto_data *proto_data_table[IP_VS_PROTO_TAB_SIZE];
 848         /* ip_vs_proto_tcp */
 849 #ifdef CONFIG_IP_VS_PROTO_TCP
 850         #define TCP_APP_TAB_BITS        4
 851         #define TCP_APP_TAB_SIZE        (1 << TCP_APP_TAB_BITS)
 852         #define TCP_APP_TAB_MASK        (TCP_APP_TAB_SIZE - 1)
 853         struct list_head        tcp_apps[TCP_APP_TAB_SIZE];
 854 #endif
 855         /* ip_vs_proto_udp */
 856 #ifdef CONFIG_IP_VS_PROTO_UDP
 857         #define UDP_APP_TAB_BITS        4
 858         #define UDP_APP_TAB_SIZE        (1 << UDP_APP_TAB_BITS)
 859         #define UDP_APP_TAB_MASK        (UDP_APP_TAB_SIZE - 1)
 860         struct list_head        udp_apps[UDP_APP_TAB_SIZE];
 861 #endif
 862         /* ip_vs_proto_sctp */
 863 #ifdef CONFIG_IP_VS_PROTO_SCTP
 864         #define SCTP_APP_TAB_BITS       4
 865         #define SCTP_APP_TAB_SIZE       (1 << SCTP_APP_TAB_BITS)
 866         #define SCTP_APP_TAB_MASK       (SCTP_APP_TAB_SIZE - 1)
 867         /* Hash table for SCTP application incarnations  */
 868         struct list_head        sctp_apps[SCTP_APP_TAB_SIZE];
 869 #endif
 870         /* ip_vs_conn */
 871         atomic_t                conn_count;      /* connection counter */
 872
 873         /* ip_vs_ctl */
 874         struct ip_vs_stats              tot_stats;  /* Statistics & est. */
 875
 876         int                     num_services;    /* no of virtual services */
 877
 878         /* Trash for destinations */
 879         struct list_head        dest_trash;
 880         spinlock_t              dest_trash_lock;
 881         struct timer_list       dest_trash_timer; /* expiration timer */
 882         /* Service counters */
 883         atomic_t                ftpsvc_counter;
 884         atomic_t                nullsvc_counter;
 885         atomic_t                conn_out_counter;
 886
 887 #ifdef CONFIG_SYSCTL
 888         /* 1/rate drop and drop-entry variables */
 889         struct delayed_work     defense_work;   /* Work handler */
 890         int                     drop_rate;
 891         int                     drop_counter;
 892         atomic_t                dropentry;
 893         /* locks in ctl.c */
 894         spinlock_t              dropentry_lock;  /* drop entry handling */
 895         spinlock_t              droppacket_lock; /* drop packet handling */
 896         spinlock_t              securetcp_lock;  /* state and timeout tables */
 897
 898         /* sys-ctl struct */
 899         struct ctl_table_header *sysctl_hdr;
 900         struct ctl_table        *sysctl_tbl;
 901 #endif
 902
 903         /* sysctl variables */
 904         int                     sysctl_amemthresh;
 905         int                     sysctl_am_droprate;
 906         int                     sysctl_drop_entry;
 907         int                     sysctl_drop_packet;
 908         int                     sysctl_secure_tcp;
 909 #ifdef CONFIG_IP_VS_NFCT
 910         int                     sysctl_conntrack;
 911 #endif
 912         int                     sysctl_snat_reroute;
 913         int                     sysctl_sync_ver;
 914         int                     sysctl_sync_ports;
 915         int                     sysctl_sync_persist_mode;
 916         unsigned long           sysctl_sync_qlen_max;
 917         int                     sysctl_sync_sock_size;
 918         int                     sysctl_cache_bypass;
 919         int                     sysctl_expire_nodest_conn;
 920         int                     sysctl_sloppy_tcp;
 921         int                     sysctl_sloppy_sctp;
 922         int                     sysctl_expire_quiescent_template;
 923         int                     sysctl_sync_threshold[2];
 924         unsigned int            sysctl_sync_refresh_period;
 925         int                     sysctl_sync_retries;
 926         int                     sysctl_nat_icmp_send;
 927         int                     sysctl_pmtu_disc;
 928         int                     sysctl_backup_only;
 929         int                     sysctl_conn_reuse_mode;
 930         int                     sysctl_schedule_icmp;
 931         int                     sysctl_ignore_tunneled;
 932
 933         /* ip_vs_lblc */
 934         int                     sysctl_lblc_expiration;
 935         struct ctl_table_header *lblc_ctl_header;
 936         struct ctl_table        *lblc_ctl_table;
 937         /* ip_vs_lblcr */
 938         int                     sysctl_lblcr_expiration;
 939         struct ctl_table_header *lblcr_ctl_header;
 940         struct ctl_table        *lblcr_ctl_table;
 941         /* ip_vs_est */
 942         struct list_head        est_list;       /* estimator list */
 943         spinlock_t              est_lock;
 944         struct timer_list       est_timer;      /* Estimation timer */
 945         /* ip_vs_sync */
 946         spinlock_t              sync_lock;
 947         struct ipvs_master_sync_state *ms;
 948         spinlock_t              sync_buff_lock;
 949         struct task_struct      **backup_threads;
 950         int                     threads_mask;
 951         volatile int            sync_state;
 952         struct mutex            sync_mutex;
 953         struct ipvs_sync_daemon_cfg     mcfg;   /* Master Configuration */
 954         struct ipvs_sync_daemon_cfg     bcfg;   /* Backup Configuration */
 955         /* net name space ptr */
 956         struct net              *net;            /* Needed by timer routines */
 957         /* Number of heterogeneous destinations, needed becaus heterogeneous
 958          * are not supported when synchronization is enabled.
 959          */
 960         unsigned int            mixed_address_family_dests;
 961 };
 962
 963 #define DEFAULT_SYNC_THRESHOLD  3
 964 #define DEFAULT_SYNC_PERIOD     50
 965 #define DEFAULT_SYNC_VER        1
 966 #define DEFAULT_SLOPPY_TCP      0
 967 #define DEFAULT_SLOPPY_SCTP     0
 968 #define DEFAULT_SYNC_REFRESH_PERIOD     (0U * HZ)
 969 #define DEFAULT_SYNC_RETRIES            0
 970 #define IPVS_SYNC_WAKEUP_RATE   8
 971 #define IPVS_SYNC_QLEN_MAX      (IPVS_SYNC_WAKEUP_RATE * 4)
 972 #define IPVS_SYNC_SEND_DELAY    (HZ / 50)
 973 #define IPVS_SYNC_CHECK_PERIOD  HZ
 974 #define IPVS_SYNC_FLUSH_TIME    (HZ * 2)
 975 #define IPVS_SYNC_PORTS_MAX     (1 << 6)
 976
 977 #ifdef CONFIG_SYSCTL
 978
 979 static inline int sysctl_sync_threshold(struct netns_ipvs *ipvs)
 980 {
 981         return ipvs->sysctl_sync_threshold[0];
 982 }
 983
 984 static inline int sysctl_sync_period(struct netns_ipvs *ipvs)
 985 {
 986         return READ_ONCE(ipvs->sysctl_sync_threshold[1]);
 987 }
 988
 989 static inline unsigned int sysctl_sync_refresh_period(struct netns_ipvs *ipvs)
 990 {
 991         return READ_ONCE(ipvs->sysctl_sync_refresh_period);
 992 }
 993
 994 static inline int sysctl_sync_retries(struct netns_ipvs *ipvs)
 995 {
 996         return ipvs->sysctl_sync_retries;
 997 }
 998
 999 static inline int sysctl_sync_ver(struct netns_ipvs *ipvs)
1000 {
1001         return ipvs->sysctl_sync_ver;
1002 }
1003
1004 static inline int sysctl_sloppy_tcp(struct netns_ipvs *ipvs)
1005 {
1006         return ipvs->sysctl_sloppy_tcp;
1007 }
1008
1009 static inline int sysctl_sloppy_sctp(struct netns_ipvs *ipvs)
1010 {
1011         return ipvs->sysctl_sloppy_sctp;
1012 }
1013
1014 static inline int sysctl_sync_ports(struct netns_ipvs *ipvs)
1015 {
1016         return READ_ONCE(ipvs->sysctl_sync_ports);
1017 }
1018
1019 static inline int sysctl_sync_persist_mode(struct netns_ipvs *ipvs)
1020 {
1021         return ipvs->sysctl_sync_persist_mode;
1022 }
1023
1024 static inline unsigned long sysctl_sync_qlen_max(struct netns_ipvs *ipvs)
1025 {
1026         return ipvs->sysctl_sync_qlen_max;
1027 }
1028
1029 static inline int sysctl_sync_sock_size(struct netns_ipvs *ipvs)
1030 {
1031         return ipvs->sysctl_sync_sock_size;
1032 }
1033
1034 static inline int sysctl_pmtu_disc(struct netns_ipvs *ipvs)
1035 {
1036         return ipvs->sysctl_pmtu_disc;
1037 }
1038
1039 static inline int sysctl_backup_only(struct netns_ipvs *ipvs)
1040 {
1041         return ipvs->sync_state & IP_VS_STATE_BACKUP &&
1042                ipvs->sysctl_backup_only;
1043 }
1044
1045 static inline int sysctl_conn_reuse_mode(struct netns_ipvs *ipvs)
1046 {
1047         return ipvs->sysctl_conn_reuse_mode;
1048 }
1049
1050 static inline int sysctl_schedule_icmp(struct netns_ipvs *ipvs)
1051 {
1052         return ipvs->sysctl_schedule_icmp;
1053 }
1054
1055 static inline int sysctl_ignore_tunneled(struct netns_ipvs *ipvs)
1056 {
1057         return ipvs->sysctl_ignore_tunneled;
1058 }
1059
1060 static inline int sysctl_cache_bypass(struct netns_ipvs *ipvs)
1061 {
1062         return ipvs->sysctl_cache_bypass;
1063 }
1064
1065 #else
1066
1067 static inline int sysctl_sync_threshold(struct netns_ipvs *ipvs)
1068 {
1069         return DEFAULT_SYNC_THRESHOLD;
1070 }
1071
1072 static inline int sysctl_sync_period(struct netns_ipvs *ipvs)
1073 {
1074         return DEFAULT_SYNC_PERIOD;
1075 }
1076
1077 static inline unsigned int sysctl_sync_refresh_period(struct netns_ipvs *ipvs)
1078 {
1079         return DEFAULT_SYNC_REFRESH_PERIOD;
1080 }
1081
1082 static inline int sysctl_sync_retries(struct netns_ipvs *ipvs)
1083 {
1084         return DEFAULT_SYNC_RETRIES & 3;
1085 }
1086
1087 static inline int sysctl_sync_ver(struct netns_ipvs *ipvs)
1088 {
1089         return DEFAULT_SYNC_VER;
1090 }
1091
1092 static inline int sysctl_sloppy_tcp(struct netns_ipvs *ipvs)
1093 {
1094         return DEFAULT_SLOPPY_TCP;
1095 }
1096
1097 static inline int sysctl_sloppy_sctp(struct netns_ipvs *ipvs)
1098 {
1099         return DEFAULT_SLOPPY_SCTP;
1100 }
1101
1102 static inline int sysctl_sync_ports(struct netns_ipvs *ipvs)
1103 {
1104         return 1;
1105 }
1106
1107 static inline int sysctl_sync_persist_mode(struct netns_ipvs *ipvs)
1108 {
1109         return 0;
1110 }
1111
1112 static inline unsigned long sysctl_sync_qlen_max(struct netns_ipvs *ipvs)
1113 {
1114         return IPVS_SYNC_QLEN_MAX;
1115 }
1116
1117 static inline int sysctl_sync_sock_size(struct netns_ipvs *ipvs)
1118 {
1119         return 0;
1120 }
1121
1122 static inline int sysctl_pmtu_disc(struct netns_ipvs *ipvs)
1123 {
1124         return 1;
1125 }
1126
1127 static inline int sysctl_backup_only(struct netns_ipvs *ipvs)
1128 {
1129         return 0;
1130 }
1131
1132 static inline int sysctl_conn_reuse_mode(struct netns_ipvs *ipvs)
1133 {
1134         return 1;
1135 }
1136
1137 static inline int sysctl_schedule_icmp(struct netns_ipvs *ipvs)
1138 {
1139         return 0;
1140 }
1141
1142 static inline int sysctl_ignore_tunneled(struct netns_ipvs *ipvs)
1143 {
1144         return 0;
1145 }
1146
1147 static inline int sysctl_cache_bypass(struct netns_ipvs *ipvs)
1148 {
1149         return 0;
1150 }
1151
1152 #endif
1153
1154 /* IPVS core functions
1155  * (from ip_vs_core.c)
1156  */
1157 const char *ip_vs_proto_name(unsigned int proto);
1158 void ip_vs_init_hash_table(struct list_head *table, int rows);
1159 struct ip_vs_conn *ip_vs_new_conn_out(struct ip_vs_service *svc,
1160                                       struct ip_vs_dest *dest,
1161                                       struct sk_buff *skb,
1162                                       const struct ip_vs_iphdr *iph,
1163                                       __be16 dport,
1164                                       __be16 cport);
1165 #define IP_VS_INIT_HASH_TABLE(t) ip_vs_init_hash_table((t), ARRAY_SIZE((t)))
1166
1167 #define IP_VS_APP_TYPE_FTP      1
1168
1169 /* ip_vs_conn handling functions
1170  * (from ip_vs_conn.c)
1171  */
1172 enum {
1173         IP_VS_DIR_INPUT = 0,
1174         IP_VS_DIR_OUTPUT,
1175         IP_VS_DIR_INPUT_ONLY,
1176         IP_VS_DIR_LAST,
1177 };
1178
1179 static inline void ip_vs_conn_fill_param(struct netns_ipvs *ipvs, int af, int protocol,
1180                                          const union nf_inet_addr *caddr,
1181                                          __be16 cport,
1182                                          const union nf_inet_addr *vaddr,
1183                                          __be16 vport,
1184                                          struct ip_vs_conn_param *p)
1185 {
1186         p->ipvs = ipvs;
1187         p->af = af;
1188         p->protocol = protocol;
1189         p->caddr = caddr;
1190         p->cport = cport;
1191         p->vaddr = vaddr;
1192         p->vport = vport;
1193         p->pe = NULL;
1194         p->pe_data = NULL;
1195 }
1196
1197 struct ip_vs_conn *ip_vs_conn_in_get(const struct ip_vs_conn_param *p);
1198 struct ip_vs_conn *ip_vs_ct_in_get(const struct ip_vs_conn_param *p);
1199
1200 struct ip_vs_conn * ip_vs_conn_in_get_proto(struct netns_ipvs *ipvs, int af,
1201                                             const struct sk_buff *skb,
1202                                             const struct ip_vs_iphdr *iph);
1203
1204 struct ip_vs_conn *ip_vs_conn_out_get(const struct ip_vs_conn_param *p);
1205
1206 struct ip_vs_conn * ip_vs_conn_out_get_proto(struct netns_ipvs *ipvs, int af,
1207                                              const struct sk_buff *skb,
1208                                              const struct ip_vs_iphdr *iph);
1209
1210 /* Get reference to gain full access to conn.
1211  * By default, RCU read-side critical sections have access only to
1212  * conn fields and its PE data, see ip_vs_conn_rcu_free() for reference.
1213  */
1214 static inline bool __ip_vs_conn_get(struct ip_vs_conn *cp)
1215 {
1216         return refcount_inc_not_zero(&cp->refcnt);
1217 }
1218
1219 /* put back the conn without restarting its timer */
1220 static inline void __ip_vs_conn_put(struct ip_vs_conn *cp)
1221 {
1222         smp_mb__before_atomic();
1223         refcount_dec(&cp->refcnt);
1224 }
1225 void ip_vs_conn_put(struct ip_vs_conn *cp);
1226 void ip_vs_conn_fill_cport(struct ip_vs_conn *cp, __be16 cport);
1227
1228 struct ip_vs_conn *ip_vs_conn_new(const struct ip_vs_conn_param *p, int dest_af,
1229                                   const union nf_inet_addr *daddr,
1230                                   __be16 dport, unsigned int flags,
1231                                   struct ip_vs_dest *dest, __u32 fwmark);
1232 void ip_vs_conn_expire_now(struct ip_vs_conn *cp);
1233
1234 const char *ip_vs_state_name(__u16 proto, int state);
1235
1236 void ip_vs_tcp_conn_listen(struct ip_vs_conn *cp);
1237 int ip_vs_check_template(struct ip_vs_conn *ct, struct ip_vs_dest *cdest);
1238 void ip_vs_random_dropentry(struct netns_ipvs *ipvs);
1239 int ip_vs_conn_init(void);
1240 void ip_vs_conn_cleanup(void);
1241
1242 static inline void ip_vs_control_del(struct ip_vs_conn *cp)
1243 {
1244         struct ip_vs_conn *ctl_cp = cp->control;
1245         if (!ctl_cp) {
1246                 IP_VS_ERR_BUF("request control DEL for uncontrolled: "
1247                               "%s:%d to %s:%d\n",
1248                               IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1249                               ntohs(cp->cport),
1250                               IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1251                               ntohs(cp->vport));
1252
1253                 return;
1254         }
1255
1256         IP_VS_DBG_BUF(7, "DELeting control for: "
1257                       "cp.dst=%s:%d ctl_cp.dst=%s:%d\n",
1258                       IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1259                       ntohs(cp->cport),
1260                       IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr),
1261                       ntohs(ctl_cp->cport));
1262
1263         cp->control = NULL;
1264         if (atomic_read(&ctl_cp->n_control) == 0) {
1265                 IP_VS_ERR_BUF("BUG control DEL with n=0 : "
1266                               "%s:%d to %s:%d\n",
1267                               IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1268                               ntohs(cp->cport),
1269                               IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1270                               ntohs(cp->vport));
1271
1272                 return;
1273         }
1274         atomic_dec(&ctl_cp->n_control);
1275 }
1276
1277 static inline void
1278 ip_vs_control_add(struct ip_vs_conn *cp, struct ip_vs_conn *ctl_cp)
1279 {
1280         if (cp->control) {
1281                 IP_VS_ERR_BUF("request control ADD for already controlled: "
1282                               "%s:%d to %s:%d\n",
1283                               IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1284                               ntohs(cp->cport),
1285                               IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1286                               ntohs(cp->vport));
1287
1288                 ip_vs_control_del(cp);
1289         }
1290
1291         IP_VS_DBG_BUF(7, "ADDing control for: "
1292                       "cp.dst=%s:%d ctl_cp.dst=%s:%d\n",
1293                       IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1294                       ntohs(cp->cport),
1295                       IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr),
1296                       ntohs(ctl_cp->cport));
1297
1298         cp->control = ctl_cp;
1299         atomic_inc(&ctl_cp->n_control);
1300 }
1301
1302 /* IPVS netns init & cleanup functions */
1303 int ip_vs_estimator_net_init(struct netns_ipvs *ipvs);
1304 int ip_vs_control_net_init(struct netns_ipvs *ipvs);
1305 int ip_vs_protocol_net_init(struct netns_ipvs *ipvs);
1306 int ip_vs_app_net_init(struct netns_ipvs *ipvs);
1307 int ip_vs_conn_net_init(struct netns_ipvs *ipvs);
1308 int ip_vs_sync_net_init(struct netns_ipvs *ipvs);
1309 void ip_vs_conn_net_cleanup(struct netns_ipvs *ipvs);
1310 void ip_vs_app_net_cleanup(struct netns_ipvs *ipvs);
1311 void ip_vs_protocol_net_cleanup(struct netns_ipvs *ipvs);
1312 void ip_vs_control_net_cleanup(struct netns_ipvs *ipvs);
1313 void ip_vs_estimator_net_cleanup(struct netns_ipvs *ipvs);
1314 void ip_vs_sync_net_cleanup(struct netns_ipvs *ipvs);
1315 void ip_vs_service_net_cleanup(struct netns_ipvs *ipvs);
1316
1317 /* IPVS application functions
1318  * (from ip_vs_app.c)
1319  */
1320 #define IP_VS_APP_MAX_PORTS  8
1321 struct ip_vs_app *register_ip_vs_app(struct netns_ipvs *ipvs, struct ip_vs_app *app);
1322 void unregister_ip_vs_app(struct netns_ipvs *ipvs, struct ip_vs_app *app);
1323 int ip_vs_bind_app(struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1324 void ip_vs_unbind_app(struct ip_vs_conn *cp);
1325 int register_ip_vs_app_inc(struct netns_ipvs *ipvs, struct ip_vs_app *app, __u16 proto,
1326                            __u16 port);
1327 int ip_vs_app_inc_get(struct ip_vs_app *inc);
1328 void ip_vs_app_inc_put(struct ip_vs_app *inc);
1329
1330 int ip_vs_app_pkt_out(struct ip_vs_conn *, struct sk_buff *skb);
1331 int ip_vs_app_pkt_in(struct ip_vs_conn *, struct sk_buff *skb);
1332
1333 int register_ip_vs_pe(struct ip_vs_pe *pe);
1334 int unregister_ip_vs_pe(struct ip_vs_pe *pe);
1335 struct ip_vs_pe *ip_vs_pe_getbyname(const char *name);
1336 struct ip_vs_pe *__ip_vs_pe_getbyname(const char *pe_name);
1337
1338 /* Use a #define to avoid all of module.h just for these trivial ops */
1339 #define ip_vs_pe_get(pe)                        \
1340         if (pe && pe->module)                   \
1341                 __module_get(pe->module);
1342
1343 #define ip_vs_pe_put(pe)                        \
1344         if (pe && pe->module)                   \
1345                 module_put(pe->module);
1346
1347 /* IPVS protocol functions (from ip_vs_proto.c) */
1348 int ip_vs_protocol_init(void);
1349 void ip_vs_protocol_cleanup(void);
1350 void ip_vs_protocol_timeout_change(struct netns_ipvs *ipvs, int flags);
1351 int *ip_vs_create_timeout_table(int *table, int size);
1352 void ip_vs_tcpudp_debug_packet(int af, struct ip_vs_protocol *pp,
1353                                const struct sk_buff *skb, int offset,
1354                                const char *msg);
1355
1356 extern struct ip_vs_protocol ip_vs_protocol_tcp;
1357 extern struct ip_vs_protocol ip_vs_protocol_udp;
1358 extern struct ip_vs_protocol ip_vs_protocol_icmp;
1359 extern struct ip_vs_protocol ip_vs_protocol_esp;
1360 extern struct ip_vs_protocol ip_vs_protocol_ah;
1361 extern struct ip_vs_protocol ip_vs_protocol_sctp;
1362
1363 /* Registering/unregistering scheduler functions
1364  * (from ip_vs_sched.c)
1365  */
1366 int register_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
1367 int unregister_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
1368 int ip_vs_bind_scheduler(struct ip_vs_service *svc,
1369                          struct ip_vs_scheduler *scheduler);
1370 void ip_vs_unbind_scheduler(struct ip_vs_service *svc,
1371                             struct ip_vs_scheduler *sched);
1372 struct ip_vs_scheduler *ip_vs_scheduler_get(const char *sched_name);
1373 void ip_vs_scheduler_put(struct ip_vs_scheduler *scheduler);
1374 struct ip_vs_conn *
1375 ip_vs_schedule(struct ip_vs_service *svc, struct sk_buff *skb,
1376                struct ip_vs_proto_data *pd, int *ignored,
1377                struct ip_vs_iphdr *iph);
1378 int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb,
1379                 struct ip_vs_proto_data *pd, struct ip_vs_iphdr *iph);
1380
1381 void ip_vs_scheduler_err(struct ip_vs_service *svc, const char *msg);
1382
1383 /* IPVS control data and functions (from ip_vs_ctl.c) */
1384 extern struct ip_vs_stats ip_vs_stats;
1385 extern int sysctl_ip_vs_sync_ver;
1386
1387 struct ip_vs_service *
1388 ip_vs_service_find(struct netns_ipvs *ipvs, int af, __u32 fwmark, __u16 protocol,
1389                   const union nf_inet_addr *vaddr, __be16 vport);
1390
1391 bool ip_vs_has_real_service(struct netns_ipvs *ipvs, int af, __u16 protocol,
1392                             const union nf_inet_addr *daddr, __be16 dport);
1393
1394 struct ip_vs_dest *
1395 ip_vs_find_real_service(struct netns_ipvs *ipvs, int af, __u16 protocol,
1396                         const union nf_inet_addr *daddr, __be16 dport);
1397
1398 int ip_vs_use_count_inc(void);
1399 void ip_vs_use_count_dec(void);
1400 int ip_vs_register_nl_ioctl(void);
1401 void ip_vs_unregister_nl_ioctl(void);
1402 int ip_vs_control_init(void);
1403 void ip_vs_control_cleanup(void);
1404 struct ip_vs_dest *
1405 ip_vs_find_dest(struct netns_ipvs *ipvs, int svc_af, int dest_af,
1406                 const union nf_inet_addr *daddr, __be16 dport,
1407                 const union nf_inet_addr *vaddr, __be16 vport,
1408                 __u16 protocol, __u32 fwmark, __u32 flags);
1409 void ip_vs_try_bind_dest(struct ip_vs_conn *cp);
1410
1411 static inline void ip_vs_dest_hold(struct ip_vs_dest *dest)
1412 {
1413         refcount_inc(&dest->refcnt);
1414 }
1415
1416 static inline void ip_vs_dest_put(struct ip_vs_dest *dest)
1417 {
1418         smp_mb__before_atomic();
1419         refcount_dec(&dest->refcnt);
1420 }
1421
1422 static inline void ip_vs_dest_put_and_free(struct ip_vs_dest *dest)
1423 {
1424         if (refcount_dec_and_test(&dest->refcnt))
1425                 kfree(dest);
1426 }
1427
1428 /* IPVS sync daemon data and function prototypes
1429  * (from ip_vs_sync.c)
1430  */
1431 int start_sync_thread(struct netns_ipvs *ipvs, struct ipvs_sync_daemon_cfg *cfg,
1432                       int state);
1433 int stop_sync_thread(struct netns_ipvs *ipvs, int state);
1434 void ip_vs_sync_conn(struct netns_ipvs *ipvs, struct ip_vs_conn *cp, int pkts);
1435
1436 /* IPVS rate estimator prototypes (from ip_vs_est.c) */
1437 void ip_vs_start_estimator(struct netns_ipvs *ipvs, struct ip_vs_stats *stats);
1438 void ip_vs_stop_estimator(struct netns_ipvs *ipvs, struct ip_vs_stats *stats);
1439 void ip_vs_zero_estimator(struct ip_vs_stats *stats);
1440 void ip_vs_read_estimator(struct ip_vs_kstats *dst, struct ip_vs_stats *stats);
1441
1442 /* Various IPVS packet transmitters (from ip_vs_xmit.c) */
1443 int ip_vs_null_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1444                     struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1445 int ip_vs_bypass_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1446                       struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1447 int ip_vs_nat_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1448                    struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1449 int ip_vs_tunnel_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1450                       struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1451 int ip_vs_dr_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1452                   struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1453 int ip_vs_icmp_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1454                     struct ip_vs_protocol *pp, int offset,
1455                     unsigned int hooknum, struct ip_vs_iphdr *iph);
1456 void ip_vs_dest_dst_rcu_free(struct rcu_head *head);
1457
1458 #ifdef CONFIG_IP_VS_IPV6
1459 int ip_vs_bypass_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1460                          struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1461 int ip_vs_nat_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1462                       struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1463 int ip_vs_tunnel_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1464                          struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1465 int ip_vs_dr_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1466                      struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1467 int ip_vs_icmp_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1468                        struct ip_vs_protocol *pp, int offset,
1469                        unsigned int hooknum, struct ip_vs_iphdr *iph);
1470 #endif
1471
1472 #ifdef CONFIG_SYSCTL
1473 /* This is a simple mechanism to ignore packets when
1474  * we are loaded. Just set ip_vs_drop_rate to 'n' and
1475  * we start to drop 1/rate of the packets
1476  */
1477 static inline int ip_vs_todrop(struct netns_ipvs *ipvs)
1478 {
1479         if (!ipvs->drop_rate)
1480                 return 0;
1481         if (--ipvs->drop_counter > 0)
1482                 return 0;
1483         ipvs->drop_counter = ipvs->drop_rate;
1484         return 1;
1485 }
1486 #else
1487 static inline int ip_vs_todrop(struct netns_ipvs *ipvs) { return 0; }
1488 #endif
1489
1490 /* ip_vs_fwd_tag returns the forwarding tag of the connection */
1491 #define IP_VS_FWD_METHOD(cp)  (cp->flags & IP_VS_CONN_F_FWD_MASK)
1492
1493 static inline char ip_vs_fwd_tag(struct ip_vs_conn *cp)
1494 {
1495         char fwd;
1496
1497         switch (IP_VS_FWD_METHOD(cp)) {
1498         case IP_VS_CONN_F_MASQ:
1499                 fwd = 'M'; break;
1500         case IP_VS_CONN_F_LOCALNODE:
1501                 fwd = 'L'; break;
1502         case IP_VS_CONN_F_TUNNEL:
1503                 fwd = 'T'; break;
1504         case IP_VS_CONN_F_DROUTE:
1505                 fwd = 'R'; break;
1506         case IP_VS_CONN_F_BYPASS:
1507                 fwd = 'B'; break;
1508         default:
1509                 fwd = '?'; break;
1510         }
1511         return fwd;
1512 }
1513
1514 void ip_vs_nat_icmp(struct sk_buff *skb, struct ip_vs_protocol *pp,
1515                     struct ip_vs_conn *cp, int dir);
1516
1517 #ifdef CONFIG_IP_VS_IPV6
1518 void ip_vs_nat_icmp_v6(struct sk_buff *skb, struct ip_vs_protocol *pp,
1519                        struct ip_vs_conn *cp, int dir);
1520 #endif
1521
1522 __sum16 ip_vs_checksum_complete(struct sk_buff *skb, int offset);
1523
1524 static inline __wsum ip_vs_check_diff4(__be32 old, __be32 new, __wsum oldsum)
1525 {
1526         __be32 diff[2] = { ~old, new };
1527
1528         return csum_partial(diff, sizeof(diff), oldsum);
1529 }
1530
1531 #ifdef CONFIG_IP_VS_IPV6
1532 static inline __wsum ip_vs_check_diff16(const __be32 *old, const __be32 *new,
1533                                         __wsum oldsum)
1534 {
1535         __be32 diff[8] = { ~old[3], ~old[2], ~old[1], ~old[0],
1536                             new[3],  new[2],  new[1],  new[0] };
1537
1538         return csum_partial(diff, sizeof(diff), oldsum);
1539 }
1540 #endif
1541
1542 static inline __wsum ip_vs_check_diff2(__be16 old, __be16 new, __wsum oldsum)
1543 {
1544         __be16 diff[2] = { ~old, new };
1545
1546         return csum_partial(diff, sizeof(diff), oldsum);
1547 }
1548
1549 /* Forget current conntrack (unconfirmed) and attach notrack entry */
1550 static inline void ip_vs_notrack(struct sk_buff *skb)
1551 {
1552 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
1553         enum ip_conntrack_info ctinfo;
1554         struct nf_conn *ct = nf_ct_get(skb, &ctinfo);
1555
1556         if (ct) {
1557                 nf_conntrack_put(&ct->ct_general);
1558                 nf_ct_set(skb, NULL, IP_CT_UNTRACKED);
1559         }
1560 #endif
1561 }
1562
1563 #ifdef CONFIG_IP_VS_NFCT
1564 /* Netfilter connection tracking
1565  * (from ip_vs_nfct.c)
1566  */
1567 static inline int ip_vs_conntrack_enabled(struct netns_ipvs *ipvs)
1568 {
1569 #ifdef CONFIG_SYSCTL
1570         return ipvs->sysctl_conntrack;
1571 #else
1572         return 0;
1573 #endif
1574 }
1575
1576 void ip_vs_update_conntrack(struct sk_buff *skb, struct ip_vs_conn *cp,
1577                             int outin);
1578 int ip_vs_confirm_conntrack(struct sk_buff *skb);
1579 void ip_vs_nfct_expect_related(struct sk_buff *skb, struct nf_conn *ct,
1580                                struct ip_vs_conn *cp, u_int8_t proto,
1581                                const __be16 port, int from_rs);
1582 void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp);
1583
1584 #else
1585
1586 static inline int ip_vs_conntrack_enabled(struct netns_ipvs *ipvs)
1587 {
1588         return 0;
1589 }
1590
1591 static inline void ip_vs_update_conntrack(struct sk_buff *skb,
1592                                           struct ip_vs_conn *cp, int outin)
1593 {
1594 }
1595
1596 static inline int ip_vs_confirm_conntrack(struct sk_buff *skb)
1597 {
1598         return NF_ACCEPT;
1599 }
1600
1601 static inline void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp)
1602 {
1603 }
1604 #endif /* CONFIG_IP_VS_NFCT */
1605
1606 /* Really using conntrack? */
1607 static inline bool ip_vs_conn_uses_conntrack(struct ip_vs_conn *cp,
1608                                              struct sk_buff *skb)
1609 {
1610 #ifdef CONFIG_IP_VS_NFCT
1611         enum ip_conntrack_info ctinfo;
1612         struct nf_conn *ct;
1613
1614         if (!(cp->flags & IP_VS_CONN_F_NFCT))
1615                 return false;
1616         ct = nf_ct_get(skb, &ctinfo);
1617         if (ct)
1618                 return true;
1619 #endif
1620         return false;
1621 }
1622
1623 static inline int
1624 ip_vs_dest_conn_overhead(struct ip_vs_dest *dest)
1625 {
1626         /* We think the overhead of processing active connections is 256
1627          * times higher than that of inactive connections in average. (This
1628          * 256 times might not be accurate, we will change it later) We
1629          * use the following formula to estimate the overhead now:
1630          *                dest->activeconns*256 + dest->inactconns
1631          */
1632         return (atomic_read(&dest->activeconns) << 8) +
1633                 atomic_read(&dest->inactconns);
1634 }
1635
1636 #endif  /* _NET_IP_VS_H */