include/net/ip

/* [<][>][^][v][top][bottom][index][help] */
This source file includes following definitions.
net_ipvs
frag_safe_skb_hp
ip_vs_fill_iph_skb_off
ip_vs_fill_iph_skb_icmp
ip_vs_fill_iph_skb
ip_vs_iph_inverse
ip_vs_iph_icmp
ip_vs_addr_copy
ip_vs_addr_set
ip_vs_addr_equal
ip_vs_dbg_addr
sysctl_sync_threshold
sysctl_sync_period
sysctl_sync_refresh_period
sysctl_sync_retries
sysctl_sync_ver
sysctl_sloppy_tcp
sysctl_sloppy_sctp
sysctl_sync_ports
sysctl_sync_persist_mode
sysctl_sync_qlen_max
sysctl_sync_sock_size
sysctl_pmtu_disc
sysctl_backup_only
sysctl_conn_reuse_mode
sysctl_schedule_icmp
sysctl_ignore_tunneled
sysctl_cache_bypass
sysctl_sync_threshold
sysctl_sync_period
sysctl_sync_refresh_period
sysctl_sync_retries
sysctl_sync_ver
sysctl_sloppy_tcp
sysctl_sloppy_sctp
sysctl_sync_ports
sysctl_sync_persist_mode
sysctl_sync_qlen_max
sysctl_sync_sock_size
sysctl_pmtu_disc
sysctl_backup_only
sysctl_conn_reuse_mode
sysctl_schedule_icmp
sysctl_ignore_tunneled
sysctl_cache_bypass
ip_vs_conn_fill_param
__ip_vs_conn_get
__ip_vs_conn_put
ip_vs_control_del
ip_vs_control_add
ip_vs_control_assure_ct
ip_vs_dest_hold
ip_vs_dest_put
ip_vs_dest_put_and_free
ip_vs_todrop
ip_vs_todrop
ip_vs_fwd_tag
ip_vs_check_diff4
ip_vs_check_diff16
ip_vs_check_diff2
ip_vs_notrack
ip_vs_conntrack_enabled
ip_vs_conntrack_enabled
ip_vs_update_conntrack
ip_vs_confirm_conntrack
ip_vs_conn_drop_conntrack
ip_vs_conn_uses_conntrack
ip_vs_register_conntrack
ip_vs_unregister_conntrack
ip_vs_dest_conn_overhead
   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 /* Connections' size value needed by ip_vs_ctl.c */
  45 extern int ip_vs_conn_tab_size;
  46 
  47 struct ip_vs_iphdr {
  48         int hdr_flags;  /* ipvs flags */
  49         __u32 off;      /* Where IP or IPv4 header starts */
  50         __u32 len;      /* IPv4 simply where L4 starts
  51                          * IPv6 where L4 Transport Header starts */
  52         __u16 fragoffs; /* IPv6 fragment offset, 0 if first frag (or not frag)*/
  53         __s16 protocol;
  54         __s32 flags;
  55         union nf_inet_addr saddr;
  56         union nf_inet_addr daddr;
  57 };
  58 
  59 static inline void *frag_safe_skb_hp(const struct sk_buff *skb, int offset,
  60                                       int len, void *buffer)
  61 {
  62         return skb_header_pointer(skb, offset, len, buffer);
  63 }
  64 
  65 /* This function handles filling *ip_vs_iphdr, both for IPv4 and IPv6.
  66  * IPv6 requires some extra work, as finding proper header position,
  67  * depend on the IPv6 extension headers.
  68  */
  69 static inline int
  70 ip_vs_fill_iph_skb_off(int af, const struct sk_buff *skb, int offset,
  71                        int hdr_flags, struct ip_vs_iphdr *iphdr)
  72 {
  73         iphdr->hdr_flags = hdr_flags;
  74         iphdr->off = offset;
  75 
  76 #ifdef CONFIG_IP_VS_IPV6
  77         if (af == AF_INET6) {
  78                 struct ipv6hdr _iph;
  79                 const struct ipv6hdr *iph = skb_header_pointer(
  80                         skb, offset, sizeof(_iph), &_iph);
  81                 if (!iph)
  82                         return 0;
  83 
  84                 iphdr->saddr.in6 = iph->saddr;
  85                 iphdr->daddr.in6 = iph->daddr;
  86                 /* ipv6_find_hdr() updates len, flags */
  87                 iphdr->len       = offset;
  88                 iphdr->flags     = 0;
  89                 iphdr->protocol  = ipv6_find_hdr(skb, &iphdr->len, -1,
  90                                                  &iphdr->fragoffs,
  91                                                  &iphdr->flags);
  92                 if (iphdr->protocol < 0)
  93                         return 0;
  94         } else
  95 #endif
  96         {
  97                 struct iphdr _iph;
  98                 const struct iphdr *iph = skb_header_pointer(
  99                         skb, offset, sizeof(_iph), &_iph);
 100                 if (!iph)
 101                         return 0;
 102 
 103                 iphdr->len      = offset + iph->ihl * 4;
 104                 iphdr->fragoffs = 0;
 105                 iphdr->protocol = iph->protocol;
 106                 iphdr->saddr.ip = iph->saddr;
 107                 iphdr->daddr.ip = iph->daddr;
 108         }
 109 
 110         return 1;
 111 }
 112 
 113 static inline int
 114 ip_vs_fill_iph_skb_icmp(int af, const struct sk_buff *skb, int offset,
 115                         bool inverse, struct ip_vs_iphdr *iphdr)
 116 {
 117         int hdr_flags = IP_VS_HDR_ICMP;
 118 
 119         if (inverse)
 120                 hdr_flags |= IP_VS_HDR_INVERSE;
 121 
 122         return ip_vs_fill_iph_skb_off(af, skb, offset, hdr_flags, iphdr);
 123 }
 124 
 125 static inline int
 126 ip_vs_fill_iph_skb(int af, const struct sk_buff *skb, bool inverse,
 127                    struct ip_vs_iphdr *iphdr)
 128 {
 129         int hdr_flags = 0;
 130 
 131         if (inverse)
 132                 hdr_flags |= IP_VS_HDR_INVERSE;
 133 
 134         return ip_vs_fill_iph_skb_off(af, skb, skb_network_offset(skb),
 135                                       hdr_flags, iphdr);
 136 }
 137 
 138 static inline bool
 139 ip_vs_iph_inverse(const struct ip_vs_iphdr *iph)
 140 {
 141         return !!(iph->hdr_flags & IP_VS_HDR_INVERSE);
 142 }
 143 
 144 static inline bool
 145 ip_vs_iph_icmp(const struct ip_vs_iphdr *iph)
 146 {
 147         return !!(iph->hdr_flags & IP_VS_HDR_ICMP);
 148 }
 149 
 150 static inline void ip_vs_addr_copy(int af, union nf_inet_addr *dst,
 151                                    const union nf_inet_addr *src)
 152 {
 153 #ifdef CONFIG_IP_VS_IPV6
 154         if (af == AF_INET6)
 155                 dst->in6 = src->in6;
 156         else
 157 #endif
 158         dst->ip = src->ip;
 159 }
 160 
 161 static inline void ip_vs_addr_set(int af, union nf_inet_addr *dst,
 162                                   const union nf_inet_addr *src)
 163 {
 164 #ifdef CONFIG_IP_VS_IPV6
 165         if (af == AF_INET6) {
 166                 dst->in6 = src->in6;
 167                 return;
 168         }
 169 #endif
 170         dst->ip = src->ip;
 171         dst->all[1] = 0;
 172         dst->all[2] = 0;
 173         dst->all[3] = 0;
 174 }
 175 
 176 static inline int ip_vs_addr_equal(int af, const union nf_inet_addr *a,
 177                                    const union nf_inet_addr *b)
 178 {
 179 #ifdef CONFIG_IP_VS_IPV6
 180         if (af == AF_INET6)
 181                 return ipv6_addr_equal(&a->in6, &b->in6);
 182 #endif
 183         return a->ip == b->ip;
 184 }
 185 
 186 #ifdef CONFIG_IP_VS_DEBUG
 187 #include <linux/net.h>
 188 
 189 int ip_vs_get_debug_level(void);
 190 
 191 static inline const char *ip_vs_dbg_addr(int af, char *buf, size_t buf_len,
 192                                          const union nf_inet_addr *addr,
 193                                          int *idx)
 194 {
 195         int len;
 196 #ifdef CONFIG_IP_VS_IPV6
 197         if (af == AF_INET6)
 198                 len = snprintf(&buf[*idx], buf_len - *idx, "[%pI6c]",
 199                                &addr->in6) + 1;
 200         else
 201 #endif
 202                 len = snprintf(&buf[*idx], buf_len - *idx, "%pI4",
 203                                &addr->ip) + 1;
 204 
 205         *idx += len;
 206         BUG_ON(*idx > buf_len + 1);
 207         return &buf[*idx - len];
 208 }
 209 
 210 #define IP_VS_DBG_BUF(level, msg, ...)                                  \
 211         do {                                                            \
 212                 char ip_vs_dbg_buf[160];                                \
 213                 int ip_vs_dbg_idx = 0;                                  \
 214                 if (level <= ip_vs_get_debug_level())                   \
 215                         printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__);  \
 216         } while (0)
 217 #define IP_VS_ERR_BUF(msg...)                                           \
 218         do {                                                            \
 219                 char ip_vs_dbg_buf[160];                                \
 220                 int ip_vs_dbg_idx = 0;                                  \
 221                 pr_err(msg);                                            \
 222         } while (0)
 223 
 224 /* Only use from within IP_VS_DBG_BUF() or IP_VS_ERR_BUF macros */
 225 #define IP_VS_DBG_ADDR(af, addr)                                        \
 226         ip_vs_dbg_addr(af, ip_vs_dbg_buf,                               \
 227                        sizeof(ip_vs_dbg_buf), addr,                     \
 228                        &ip_vs_dbg_idx)
 229 
 230 #define IP_VS_DBG(level, msg, ...)                                      \
 231         do {                                                            \
 232                 if (level <= ip_vs_get_debug_level())                   \
 233                         printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__);  \
 234         } while (0)
 235 #define IP_VS_DBG_RL(msg, ...)                                          \
 236         do {                                                            \
 237                 if (net_ratelimit())                                    \
 238                         printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__);  \
 239         } while (0)
 240 #define IP_VS_DBG_PKT(level, af, pp, skb, ofs, msg)                     \
 241         do {                                                            \
 242                 if (level <= ip_vs_get_debug_level())                   \
 243                         pp->debug_packet(af, pp, skb, ofs, msg);        \
 244         } while (0)
 245 #define IP_VS_DBG_RL_PKT(level, af, pp, skb, ofs, msg)                  \
 246         do {                                                            \
 247                 if (level <= ip_vs_get_debug_level() &&                 \
 248                     net_ratelimit())                                    \
 249                         pp->debug_packet(af, pp, skb, ofs, msg);        \
 250         } while (0)
 251 #else   /* NO DEBUGGING at ALL */
 252 #define IP_VS_DBG_BUF(level, msg...)  do {} while (0)
 253 #define IP_VS_ERR_BUF(msg...)  do {} while (0)
 254 #define IP_VS_DBG(level, msg...)  do {} while (0)
 255 #define IP_VS_DBG_RL(msg...)  do {} while (0)
 256 #define IP_VS_DBG_PKT(level, af, pp, skb, ofs, msg)     do {} while (0)
 257 #define IP_VS_DBG_RL_PKT(level, af, pp, skb, ofs, msg)  do {} while (0)
 258 #endif
 259 
 260 #define IP_VS_BUG() BUG()
 261 #define IP_VS_ERR_RL(msg, ...)                                          \
 262         do {                                                            \
 263                 if (net_ratelimit())                                    \
 264                         pr_err(msg, ##__VA_ARGS__);                     \
 265         } while (0)
 266 
 267 #ifdef CONFIG_IP_VS_DEBUG
 268 #define EnterFunction(level)                                            \
 269         do {                                                            \
 270                 if (level <= ip_vs_get_debug_level())                   \
 271                         printk(KERN_DEBUG                               \
 272                                pr_fmt("Enter: %s, %s line %i\n"),       \
 273                                __func__, __FILE__, __LINE__);           \
 274         } while (0)
 275 #define LeaveFunction(level)                                            \
 276         do {                                                            \
 277                 if (level <= ip_vs_get_debug_level())                   \
 278                         printk(KERN_DEBUG                               \
 279                                pr_fmt("Leave: %s, %s line %i\n"),       \
 280                                __func__, __FILE__, __LINE__);           \
 281         } while (0)
 282 #else
 283 #define EnterFunction(level)   do {} while (0)
 284 #define LeaveFunction(level)   do {} while (0)
 285 #endif
 286 
 287 /* The port number of FTP service (in network order). */
 288 #define FTPPORT  cpu_to_be16(21)
 289 #define FTPDATA  cpu_to_be16(20)
 290 
 291 /* TCP State Values */
 292 enum {
 293         IP_VS_TCP_S_NONE = 0,
 294         IP_VS_TCP_S_ESTABLISHED,
 295         IP_VS_TCP_S_SYN_SENT,
 296         IP_VS_TCP_S_SYN_RECV,
 297         IP_VS_TCP_S_FIN_WAIT,
 298         IP_VS_TCP_S_TIME_WAIT,
 299         IP_VS_TCP_S_CLOSE,
 300         IP_VS_TCP_S_CLOSE_WAIT,
 301         IP_VS_TCP_S_LAST_ACK,
 302         IP_VS_TCP_S_LISTEN,
 303         IP_VS_TCP_S_SYNACK,
 304         IP_VS_TCP_S_LAST
 305 };
 306 
 307 /* UDP State Values */
 308 enum {
 309         IP_VS_UDP_S_NORMAL,
 310         IP_VS_UDP_S_LAST,
 311 };
 312 
 313 /* ICMP State Values */
 314 enum {
 315         IP_VS_ICMP_S_NORMAL,
 316         IP_VS_ICMP_S_LAST,
 317 };
 318 
 319 /* SCTP State Values */
 320 enum ip_vs_sctp_states {
 321         IP_VS_SCTP_S_NONE,
 322         IP_VS_SCTP_S_INIT1,
 323         IP_VS_SCTP_S_INIT,
 324         IP_VS_SCTP_S_COOKIE_SENT,
 325         IP_VS_SCTP_S_COOKIE_REPLIED,
 326         IP_VS_SCTP_S_COOKIE_WAIT,
 327         IP_VS_SCTP_S_COOKIE,
 328         IP_VS_SCTP_S_COOKIE_ECHOED,
 329         IP_VS_SCTP_S_ESTABLISHED,
 330         IP_VS_SCTP_S_SHUTDOWN_SENT,
 331         IP_VS_SCTP_S_SHUTDOWN_RECEIVED,
 332         IP_VS_SCTP_S_SHUTDOWN_ACK_SENT,
 333         IP_VS_SCTP_S_REJECTED,
 334         IP_VS_SCTP_S_CLOSED,
 335         IP_VS_SCTP_S_LAST
 336 };
 337 
 338 /* Connection templates use bits from state */
 339 #define IP_VS_CTPL_S_NONE               0x0000
 340 #define IP_VS_CTPL_S_ASSURED            0x0001
 341 #define IP_VS_CTPL_S_LAST               0x0002
 342 
 343 /* Delta sequence info structure
 344  * Each ip_vs_conn has 2 (output AND input seq. changes).
 345  * Only used in the VS/NAT.
 346  */
 347 struct ip_vs_seq {
 348         __u32                   init_seq;       /* Add delta from this seq */
 349         __u32                   delta;          /* Delta in sequence numbers */
 350         __u32                   previous_delta; /* Delta in sequence numbers
 351                                                  * before last resized pkt */
 352 };
 353 
 354 /* counters per cpu */
 355 struct ip_vs_counters {
 356         __u64           conns;          /* connections scheduled */
 357         __u64           inpkts;         /* incoming packets */
 358         __u64           outpkts;        /* outgoing packets */
 359         __u64           inbytes;        /* incoming bytes */
 360         __u64           outbytes;       /* outgoing bytes */
 361 };
 362 /* Stats per cpu */
 363 struct ip_vs_cpu_stats {
 364         struct ip_vs_counters   cnt;
 365         struct u64_stats_sync   syncp;
 366 };
 367 
 368 /* IPVS statistics objects */
 369 struct ip_vs_estimator {
 370         struct list_head        list;
 371 
 372         u64                     last_inbytes;
 373         u64                     last_outbytes;
 374         u64                     last_conns;
 375         u64                     last_inpkts;
 376         u64                     last_outpkts;
 377 
 378         u64                     cps;
 379         u64                     inpps;
 380         u64                     outpps;
 381         u64                     inbps;
 382         u64                     outbps;
 383 };
 384 
 385 /*
 386  * IPVS statistics object, 64-bit kernel version of struct ip_vs_stats_user
 387  */
 388 struct ip_vs_kstats {
 389         u64                     conns;          /* connections scheduled */
 390         u64                     inpkts;         /* incoming packets */
 391         u64                     outpkts;        /* outgoing packets */
 392         u64                     inbytes;        /* incoming bytes */
 393         u64                     outbytes;       /* outgoing bytes */
 394 
 395         u64                     cps;            /* current connection rate */
 396         u64                     inpps;          /* current in packet rate */
 397         u64                     outpps;         /* current out packet rate */
 398         u64                     inbps;          /* current in byte rate */
 399         u64                     outbps;         /* current out byte rate */
 400 };
 401 
 402 struct ip_vs_stats {
 403         struct ip_vs_kstats     kstats;         /* kernel statistics */
 404         struct ip_vs_estimator  est;            /* estimator */
 405         struct ip_vs_cpu_stats __percpu *cpustats;      /* per cpu counters */
 406         spinlock_t              lock;           /* spin lock */
 407         struct ip_vs_kstats     kstats0;        /* reset values */
 408 };
 409 
 410 struct dst_entry;
 411 struct iphdr;
 412 struct ip_vs_conn;
 413 struct ip_vs_app;
 414 struct sk_buff;
 415 struct ip_vs_proto_data;
 416 
 417 struct ip_vs_protocol {
 418         struct ip_vs_protocol   *next;
 419         char                    *name;
 420         u16                     protocol;
 421         u16                     num_states;
 422         int                     dont_defrag;
 423 
 424         void (*init)(struct ip_vs_protocol *pp);
 425 
 426         void (*exit)(struct ip_vs_protocol *pp);
 427 
 428         int (*init_netns)(struct netns_ipvs *ipvs, struct ip_vs_proto_data *pd);
 429 
 430         void (*exit_netns)(struct netns_ipvs *ipvs, struct ip_vs_proto_data *pd);
 431 
 432         int (*conn_schedule)(struct netns_ipvs *ipvs,
 433                              int af, struct sk_buff *skb,
 434                              struct ip_vs_proto_data *pd,
 435                              int *verdict, struct ip_vs_conn **cpp,
 436                              struct ip_vs_iphdr *iph);
 437 
 438         struct ip_vs_conn *
 439         (*conn_in_get)(struct netns_ipvs *ipvs,
 440                        int af,
 441                        const struct sk_buff *skb,
 442                        const struct ip_vs_iphdr *iph);
 443 
 444         struct ip_vs_conn *
 445         (*conn_out_get)(struct netns_ipvs *ipvs,
 446                         int af,
 447                         const struct sk_buff *skb,
 448                         const struct ip_vs_iphdr *iph);
 449 
 450         int (*snat_handler)(struct sk_buff *skb, struct ip_vs_protocol *pp,
 451                             struct ip_vs_conn *cp, struct ip_vs_iphdr *iph);
 452 
 453         int (*dnat_handler)(struct sk_buff *skb, struct ip_vs_protocol *pp,
 454                             struct ip_vs_conn *cp, struct ip_vs_iphdr *iph);
 455 
 456         const char *(*state_name)(int state);
 457 
 458         void (*state_transition)(struct ip_vs_conn *cp, int direction,
 459                                  const struct sk_buff *skb,
 460                                  struct ip_vs_proto_data *pd);
 461 
 462         int (*register_app)(struct netns_ipvs *ipvs, struct ip_vs_app *inc);
 463 
 464         void (*unregister_app)(struct netns_ipvs *ipvs, struct ip_vs_app *inc);
 465 
 466         int (*app_conn_bind)(struct ip_vs_conn *cp);
 467 
 468         void (*debug_packet)(int af, struct ip_vs_protocol *pp,
 469                              const struct sk_buff *skb,
 470                              int offset,
 471                              const char *msg);
 472 
 473         void (*timeout_change)(struct ip_vs_proto_data *pd, int flags);
 474 };
 475 
 476 /* protocol data per netns */
 477 struct ip_vs_proto_data {
 478         struct ip_vs_proto_data *next;
 479         struct ip_vs_protocol   *pp;
 480         int                     *timeout_table; /* protocol timeout table */
 481         atomic_t                appcnt;         /* counter of proto app incs. */
 482         struct tcp_states_t     *tcp_state_table;
 483 };
 484 
 485 struct ip_vs_protocol   *ip_vs_proto_get(unsigned short proto);
 486 struct ip_vs_proto_data *ip_vs_proto_data_get(struct netns_ipvs *ipvs,
 487                                               unsigned short proto);
 488 
 489 struct ip_vs_conn_param {
 490         struct netns_ipvs               *ipvs;
 491         const union nf_inet_addr        *caddr;
 492         const union nf_inet_addr        *vaddr;
 493         __be16                          cport;
 494         __be16                          vport;
 495         __u16                           protocol;
 496         u16                             af;
 497 
 498         const struct ip_vs_pe           *pe;
 499         char                            *pe_data;
 500         __u8                            pe_data_len;
 501 };
 502 
 503 /* IP_VS structure allocated for each dynamically scheduled connection */
 504 struct ip_vs_conn {
 505         struct hlist_node       c_list;         /* hashed list heads */
 506         /* Protocol, addresses and port numbers */
 507         __be16                  cport;
 508         __be16                  dport;
 509         __be16                  vport;
 510         u16                     af;             /* address family */
 511         union nf_inet_addr      caddr;          /* client address */
 512         union nf_inet_addr      vaddr;          /* virtual address */
 513         union nf_inet_addr      daddr;          /* destination address */
 514         volatile __u32          flags;          /* status flags */
 515         __u16                   protocol;       /* Which protocol (TCP/UDP) */
 516         __u16                   daf;            /* Address family of the dest */
 517         struct netns_ipvs       *ipvs;
 518 
 519         /* counter and timer */
 520         refcount_t              refcnt;         /* reference count */
 521         struct timer_list       timer;          /* Expiration timer */
 522         volatile unsigned long  timeout;        /* timeout */
 523 
 524         /* Flags and state transition */
 525         spinlock_t              lock;           /* lock for state transition */
 526         volatile __u16          state;          /* state info */
 527         volatile __u16          old_state;      /* old state, to be used for
 528                                                  * state transition triggerd
 529                                                  * synchronization
 530                                                  */
 531         __u32                   fwmark;         /* Fire wall mark from skb */
 532         unsigned long           sync_endtime;   /* jiffies + sent_retries */
 533 
 534         /* Control members */
 535         struct ip_vs_conn       *control;       /* Master control connection */
 536         atomic_t                n_control;      /* Number of controlled ones */
 537         struct ip_vs_dest       *dest;          /* real server */
 538         atomic_t                in_pkts;        /* incoming packet counter */
 539 
 540         /* Packet transmitter for different forwarding methods.  If it
 541          * mangles the packet, it must return NF_DROP or better NF_STOLEN,
 542          * otherwise this must be changed to a sk_buff **.
 543          * NF_ACCEPT can be returned when destination is local.
 544          */
 545         int (*packet_xmit)(struct sk_buff *skb, struct ip_vs_conn *cp,
 546                            struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
 547 
 548         /* Note: we can group the following members into a structure,
 549          * in order to save more space, and the following members are
 550          * only used in VS/NAT anyway
 551          */
 552         struct ip_vs_app        *app;           /* bound ip_vs_app object */
 553         void                    *app_data;      /* Application private data */
 554         struct ip_vs_seq        in_seq;         /* incoming seq. struct */
 555         struct ip_vs_seq        out_seq;        /* outgoing seq. struct */
 556 
 557         const struct ip_vs_pe   *pe;
 558         char                    *pe_data;
 559         __u8                    pe_data_len;
 560 
 561         struct rcu_head         rcu_head;
 562 };
 563 
 564 /* Extended internal versions of struct ip_vs_service_user and ip_vs_dest_user
 565  * for IPv6 support.
 566  *
 567  * We need these to conveniently pass around service and destination
 568  * options, but unfortunately, we also need to keep the old definitions to
 569  * maintain userspace backwards compatibility for the setsockopt interface.
 570  */
 571 struct ip_vs_service_user_kern {
 572         /* virtual service addresses */
 573         u16                     af;
 574         u16                     protocol;
 575         union nf_inet_addr      addr;           /* virtual ip address */
 576         __be16                  port;
 577         u32                     fwmark;         /* firwall mark of service */
 578 
 579         /* virtual service options */
 580         char                    *sched_name;
 581         char                    *pe_name;
 582         unsigned int            flags;          /* virtual service flags */
 583         unsigned int            timeout;        /* persistent timeout in sec */
 584         __be32                  netmask;        /* persistent netmask or plen */
 585 };
 586 
 587 
 588 struct ip_vs_dest_user_kern {
 589         /* destination server address */
 590         union nf_inet_addr      addr;
 591         __be16                  port;
 592 
 593         /* real server options */
 594         unsigned int            conn_flags;     /* connection flags */
 595         int                     weight;         /* destination weight */
 596 
 597         /* thresholds for active connections */
 598         u32                     u_threshold;    /* upper threshold */
 599         u32                     l_threshold;    /* lower threshold */
 600 
 601         /* Address family of addr */
 602         u16                     af;
 603 
 604         u16                     tun_type;       /* tunnel type */
 605         __be16                  tun_port;       /* tunnel port */
 606         u16                     tun_flags;      /* tunnel flags */
 607 };
 608 
 609 
 610 /*
 611  * The information about the virtual service offered to the net and the
 612  * forwarding entries.
 613  */
 614 struct ip_vs_service {
 615         struct hlist_node       s_list;   /* for normal service table */
 616         struct hlist_node       f_list;   /* for fwmark-based service table */
 617         atomic_t                refcnt;   /* reference counter */
 618 
 619         u16                     af;       /* address family */
 620         __u16                   protocol; /* which protocol (TCP/UDP) */
 621         union nf_inet_addr      addr;     /* IP address for virtual service */
 622         __be16                  port;     /* port number for the service */
 623         __u32                   fwmark;   /* firewall mark of the service */
 624         unsigned int            flags;    /* service status flags */
 625         unsigned int            timeout;  /* persistent timeout in ticks */
 626         __be32                  netmask;  /* grouping granularity, mask/plen */
 627         struct netns_ipvs       *ipvs;
 628 
 629         struct list_head        destinations;  /* real server d-linked list */
 630         __u32                   num_dests;     /* number of servers */
 631         struct ip_vs_stats      stats;         /* statistics for the service */
 632 
 633         /* for scheduling */
 634         struct ip_vs_scheduler __rcu *scheduler; /* bound scheduler object */
 635         spinlock_t              sched_lock;    /* lock sched_data */
 636         void                    *sched_data;   /* scheduler application data */
 637 
 638         /* alternate persistence engine */
 639         struct ip_vs_pe __rcu   *pe;
 640         int                     conntrack_afmask;
 641 
 642         struct rcu_head         rcu_head;
 643 };
 644 
 645 /* Information for cached dst */
 646 struct ip_vs_dest_dst {
 647         struct dst_entry        *dst_cache;     /* destination cache entry */
 648         u32                     dst_cookie;
 649         union nf_inet_addr      dst_saddr;
 650         struct rcu_head         rcu_head;
 651 };
 652 
 653 /* The real server destination forwarding entry with ip address, port number,
 654  * and so on.
 655  */
 656 struct ip_vs_dest {
 657         struct list_head        n_list;   /* for the dests in the service */
 658         struct hlist_node       d_list;   /* for table with all the dests */
 659 
 660         u16                     af;             /* address family */
 661         __be16                  port;           /* port number of the server */
 662         union nf_inet_addr      addr;           /* IP address of the server */
 663         volatile unsigned int   flags;          /* dest status flags */
 664         atomic_t                conn_flags;     /* flags to copy to conn */
 665         atomic_t                weight;         /* server weight */
 666         atomic_t                last_weight;    /* server latest weight */
 667         __u16                   tun_type;       /* tunnel type */
 668         __be16                  tun_port;       /* tunnel port */
 669         __u16                   tun_flags;      /* tunnel flags */
 670 
 671         refcount_t              refcnt;         /* reference counter */
 672         struct ip_vs_stats      stats;          /* statistics */
 673         unsigned long           idle_start;     /* start time, jiffies */
 674 
 675         /* connection counters and thresholds */
 676         atomic_t                activeconns;    /* active connections */
 677         atomic_t                inactconns;     /* inactive connections */
 678         atomic_t                persistconns;   /* persistent connections */
 679         __u32                   u_threshold;    /* upper threshold */
 680         __u32                   l_threshold;    /* lower threshold */
 681 
 682         /* for destination cache */
 683         spinlock_t              dst_lock;       /* lock of dst_cache */
 684         struct ip_vs_dest_dst __rcu *dest_dst;  /* cached dst info */
 685 
 686         /* for virtual service */
 687         struct ip_vs_service __rcu *svc;        /* service it belongs to */
 688         __u16                   protocol;       /* which protocol (TCP/UDP) */
 689         __be16                  vport;          /* virtual port number */
 690         union nf_inet_addr      vaddr;          /* virtual IP address */
 691         __u32                   vfwmark;        /* firewall mark of service */
 692 
 693         struct list_head        t_list;         /* in dest_trash */
 694         unsigned int            in_rs_table:1;  /* we are in rs_table */
 695 };
 696 
 697 /* The scheduler object */
 698 struct ip_vs_scheduler {
 699         struct list_head        n_list;         /* d-linked list head */
 700         char                    *name;          /* scheduler name */
 701         atomic_t                refcnt;         /* reference counter */
 702         struct module           *module;        /* THIS_MODULE/NULL */
 703 
 704         /* scheduler initializing service */
 705         int (*init_service)(struct ip_vs_service *svc);
 706         /* scheduling service finish */
 707         void (*done_service)(struct ip_vs_service *svc);
 708         /* dest is linked */
 709         int (*add_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest);
 710         /* dest is unlinked */
 711         int (*del_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest);
 712         /* dest is updated */
 713         int (*upd_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest);
 714 
 715         /* selecting a server from the given service */
 716         struct ip_vs_dest* (*schedule)(struct ip_vs_service *svc,
 717                                        const struct sk_buff *skb,
 718                                        struct ip_vs_iphdr *iph);
 719 };
 720 
 721 /* The persistence engine object */
 722 struct ip_vs_pe {
 723         struct list_head        n_list;         /* d-linked list head */
 724         char                    *name;          /* scheduler name */
 725         atomic_t                refcnt;         /* reference counter */
 726         struct module           *module;        /* THIS_MODULE/NULL */
 727 
 728         /* get the connection template, if any */
 729         int (*fill_param)(struct ip_vs_conn_param *p, struct sk_buff *skb);
 730         bool (*ct_match)(const struct ip_vs_conn_param *p,
 731                          struct ip_vs_conn *ct);
 732         u32 (*hashkey_raw)(const struct ip_vs_conn_param *p, u32 initval,
 733                            bool inverse);
 734         int (*show_pe_data)(const struct ip_vs_conn *cp, char *buf);
 735         /* create connections for real-server outgoing packets */
 736         struct ip_vs_conn* (*conn_out)(struct ip_vs_service *svc,
 737                                        struct ip_vs_dest *dest,
 738                                        struct sk_buff *skb,
 739                                        const struct ip_vs_iphdr *iph,
 740                                        __be16 dport, __be16 cport);
 741 };
 742 
 743 /* The application module object (a.k.a. app incarnation) */
 744 struct ip_vs_app {
 745         struct list_head        a_list;         /* member in app list */
 746         int                     type;           /* IP_VS_APP_TYPE_xxx */
 747         char                    *name;          /* application module name */
 748         __u16                   protocol;
 749         struct module           *module;        /* THIS_MODULE/NULL */
 750         struct list_head        incs_list;      /* list of incarnations */
 751 
 752         /* members for application incarnations */
 753         struct list_head        p_list;         /* member in proto app list */
 754         struct ip_vs_app        *app;           /* its real application */
 755         __be16                  port;           /* port number in net order */
 756         atomic_t                usecnt;         /* usage counter */
 757         struct rcu_head         rcu_head;
 758 
 759         /* output hook: Process packet in inout direction, diff set for TCP.
 760          * Return: 0=Error, 1=Payload Not Mangled/Mangled but checksum is ok,
 761          *         2=Mangled but checksum was not updated
 762          */
 763         int (*pkt_out)(struct ip_vs_app *, struct ip_vs_conn *,
 764                        struct sk_buff *, int *diff, struct ip_vs_iphdr *ipvsh);
 765 
 766         /* input hook: Process packet in outin direction, diff set for TCP.
 767          * Return: 0=Error, 1=Payload Not Mangled/Mangled but checksum is ok,
 768          *         2=Mangled but checksum was not updated
 769          */
 770         int (*pkt_in)(struct ip_vs_app *, struct ip_vs_conn *,
 771                       struct sk_buff *, int *diff, struct ip_vs_iphdr *ipvsh);
 772 
 773         /* ip_vs_app initializer */
 774         int (*init_conn)(struct ip_vs_app *, struct ip_vs_conn *);
 775 
 776         /* ip_vs_app finish */
 777         int (*done_conn)(struct ip_vs_app *, struct ip_vs_conn *);
 778 
 779 
 780         /* not used now */
 781         int (*bind_conn)(struct ip_vs_app *, struct ip_vs_conn *,
 782                          struct ip_vs_protocol *);
 783 
 784         void (*unbind_conn)(struct ip_vs_app *, struct ip_vs_conn *);
 785 
 786         int *                   timeout_table;
 787         int *                   timeouts;
 788         int                     timeouts_size;
 789 
 790         int (*conn_schedule)(struct sk_buff *skb, struct ip_vs_app *app,
 791                              int *verdict, struct ip_vs_conn **cpp);
 792 
 793         struct ip_vs_conn *
 794         (*conn_in_get)(const struct sk_buff *skb, struct ip_vs_app *app,
 795                        const struct iphdr *iph, int inverse);
 796 
 797         struct ip_vs_conn *
 798         (*conn_out_get)(const struct sk_buff *skb, struct ip_vs_app *app,
 799                         const struct iphdr *iph, int inverse);
 800 
 801         int (*state_transition)(struct ip_vs_conn *cp, int direction,
 802                                 const struct sk_buff *skb,
 803                                 struct ip_vs_app *app);
 804 
 805         void (*timeout_change)(struct ip_vs_app *app, int flags);
 806 };
 807 
 808 struct ipvs_master_sync_state {
 809         struct list_head        sync_queue;
 810         struct ip_vs_sync_buff  *sync_buff;
 811         unsigned long           sync_queue_len;
 812         unsigned int            sync_queue_delay;
 813         struct delayed_work     master_wakeup_work;
 814         struct netns_ipvs       *ipvs;
 815 };
 816 
 817 struct ip_vs_sync_thread_data;
 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         int                     old_secure_tcp;
 893         atomic_t                dropentry;
 894         /* locks in ctl.c */
 895         spinlock_t              dropentry_lock;  /* drop entry handling */
 896         spinlock_t              droppacket_lock; /* drop packet handling */
 897         spinlock_t              securetcp_lock;  /* state and timeout tables */
 898 
 899         /* sys-ctl struct */
 900         struct ctl_table_header *sysctl_hdr;
 901         struct ctl_table        *sysctl_tbl;
 902 #endif
 903 
 904         /* sysctl variables */
 905         int                     sysctl_amemthresh;
 906         int                     sysctl_am_droprate;
 907         int                     sysctl_drop_entry;
 908         int                     sysctl_drop_packet;
 909         int                     sysctl_secure_tcp;
 910 #ifdef CONFIG_IP_VS_NFCT
 911         int                     sysctl_conntrack;
 912 #endif
 913         int                     sysctl_snat_reroute;
 914         int                     sysctl_sync_ver;
 915         int                     sysctl_sync_ports;
 916         int                     sysctl_sync_persist_mode;
 917         unsigned long           sysctl_sync_qlen_max;
 918         int                     sysctl_sync_sock_size;
 919         int                     sysctl_cache_bypass;
 920         int                     sysctl_expire_nodest_conn;
 921         int                     sysctl_sloppy_tcp;
 922         int                     sysctl_sloppy_sctp;
 923         int                     sysctl_expire_quiescent_template;
 924         int                     sysctl_sync_threshold[2];
 925         unsigned int            sysctl_sync_refresh_period;
 926         int                     sysctl_sync_retries;
 927         int                     sysctl_nat_icmp_send;
 928         int                     sysctl_pmtu_disc;
 929         int                     sysctl_backup_only;
 930         int                     sysctl_conn_reuse_mode;
 931         int                     sysctl_schedule_icmp;
 932         int                     sysctl_ignore_tunneled;
 933 
 934         /* ip_vs_lblc */
 935         int                     sysctl_lblc_expiration;
 936         struct ctl_table_header *lblc_ctl_header;
 937         struct ctl_table        *lblc_ctl_table;
 938         /* ip_vs_lblcr */
 939         int                     sysctl_lblcr_expiration;
 940         struct ctl_table_header *lblcr_ctl_header;
 941         struct ctl_table        *lblcr_ctl_table;
 942         /* ip_vs_est */
 943         struct list_head        est_list;       /* estimator list */
 944         spinlock_t              est_lock;
 945         struct timer_list       est_timer;      /* Estimation timer */
 946         /* ip_vs_sync */
 947         spinlock_t              sync_lock;
 948         struct ipvs_master_sync_state *ms;
 949         spinlock_t              sync_buff_lock;
 950         struct ip_vs_sync_thread_data *master_tinfo;
 951         struct ip_vs_sync_thread_data *backup_tinfo;
 952         int                     threads_mask;
 953         volatile int            sync_state;
 954         struct mutex            sync_mutex;
 955         struct ipvs_sync_daemon_cfg     mcfg;   /* Master Configuration */
 956         struct ipvs_sync_daemon_cfg     bcfg;   /* Backup Configuration */
 957         /* net name space ptr */
 958         struct net              *net;            /* Needed by timer routines */
 959         /* Number of heterogeneous destinations, needed becaus heterogeneous
 960          * are not supported when synchronization is enabled.
 961          */
 962         unsigned int            mixed_address_family_dests;
 963 };
 964 
 965 #define DEFAULT_SYNC_THRESHOLD  3
 966 #define DEFAULT_SYNC_PERIOD     50
 967 #define DEFAULT_SYNC_VER        1
 968 #define DEFAULT_SLOPPY_TCP      0
 969 #define DEFAULT_SLOPPY_SCTP     0
 970 #define DEFAULT_SYNC_REFRESH_PERIOD     (0U * HZ)
 971 #define DEFAULT_SYNC_RETRIES            0
 972 #define IPVS_SYNC_WAKEUP_RATE   8
 973 #define IPVS_SYNC_QLEN_MAX      (IPVS_SYNC_WAKEUP_RATE * 4)
 974 #define IPVS_SYNC_SEND_DELAY    (HZ / 50)
 975 #define IPVS_SYNC_CHECK_PERIOD  HZ
 976 #define IPVS_SYNC_FLUSH_TIME    (HZ * 2)
 977 #define IPVS_SYNC_PORTS_MAX     (1 << 6)
 978 
 979 #ifdef CONFIG_SYSCTL
 980 
 981 static inline int sysctl_sync_threshold(struct netns_ipvs *ipvs)
 982 {
 983         return ipvs->sysctl_sync_threshold[0];
 984 }
 985 
 986 static inline int sysctl_sync_period(struct netns_ipvs *ipvs)
 987 {
 988         return READ_ONCE(ipvs->sysctl_sync_threshold[1]);
 989 }
 990 
 991 static inline unsigned int sysctl_sync_refresh_period(struct netns_ipvs *ipvs)
 992 {
 993         return READ_ONCE(ipvs->sysctl_sync_refresh_period);
 994 }
 995 
 996 static inline int sysctl_sync_retries(struct netns_ipvs *ipvs)
 997 {
 998         return ipvs->sysctl_sync_retries;
 999 }
1000 
1001 static inline int sysctl_sync_ver(struct netns_ipvs *ipvs)
1002 {
1003         return ipvs->sysctl_sync_ver;
1004 }
1005 
1006 static inline int sysctl_sloppy_tcp(struct netns_ipvs *ipvs)
1007 {
1008         return ipvs->sysctl_sloppy_tcp;
1009 }
1010 
1011 static inline int sysctl_sloppy_sctp(struct netns_ipvs *ipvs)
1012 {
1013         return ipvs->sysctl_sloppy_sctp;
1014 }
1015 
1016 static inline int sysctl_sync_ports(struct netns_ipvs *ipvs)
1017 {
1018         return READ_ONCE(ipvs->sysctl_sync_ports);
1019 }
1020 
1021 static inline int sysctl_sync_persist_mode(struct netns_ipvs *ipvs)
1022 {
1023         return ipvs->sysctl_sync_persist_mode;
1024 }
1025 
1026 static inline unsigned long sysctl_sync_qlen_max(struct netns_ipvs *ipvs)
1027 {
1028         return ipvs->sysctl_sync_qlen_max;
1029 }
1030 
1031 static inline int sysctl_sync_sock_size(struct netns_ipvs *ipvs)
1032 {
1033         return ipvs->sysctl_sync_sock_size;
1034 }
1035 
1036 static inline int sysctl_pmtu_disc(struct netns_ipvs *ipvs)
1037 {
1038         return ipvs->sysctl_pmtu_disc;
1039 }
1040 
1041 static inline int sysctl_backup_only(struct netns_ipvs *ipvs)
1042 {
1043         return ipvs->sync_state & IP_VS_STATE_BACKUP &&
1044                ipvs->sysctl_backup_only;
1045 }
1046 
1047 static inline int sysctl_conn_reuse_mode(struct netns_ipvs *ipvs)
1048 {
1049         return ipvs->sysctl_conn_reuse_mode;
1050 }
1051 
1052 static inline int sysctl_schedule_icmp(struct netns_ipvs *ipvs)
1053 {
1054         return ipvs->sysctl_schedule_icmp;
1055 }
1056 
1057 static inline int sysctl_ignore_tunneled(struct netns_ipvs *ipvs)
1058 {
1059         return ipvs->sysctl_ignore_tunneled;
1060 }
1061 
1062 static inline int sysctl_cache_bypass(struct netns_ipvs *ipvs)
1063 {
1064         return ipvs->sysctl_cache_bypass;
1065 }
1066 
1067 #else
1068 
1069 static inline int sysctl_sync_threshold(struct netns_ipvs *ipvs)
1070 {
1071         return DEFAULT_SYNC_THRESHOLD;
1072 }
1073 
1074 static inline int sysctl_sync_period(struct netns_ipvs *ipvs)
1075 {
1076         return DEFAULT_SYNC_PERIOD;
1077 }
1078 
1079 static inline unsigned int sysctl_sync_refresh_period(struct netns_ipvs *ipvs)
1080 {
1081         return DEFAULT_SYNC_REFRESH_PERIOD;
1082 }
1083 
1084 static inline int sysctl_sync_retries(struct netns_ipvs *ipvs)
1085 {
1086         return DEFAULT_SYNC_RETRIES & 3;
1087 }
1088 
1089 static inline int sysctl_sync_ver(struct netns_ipvs *ipvs)
1090 {
1091         return DEFAULT_SYNC_VER;
1092 }
1093 
1094 static inline int sysctl_sloppy_tcp(struct netns_ipvs *ipvs)
1095 {
1096         return DEFAULT_SLOPPY_TCP;
1097 }
1098 
1099 static inline int sysctl_sloppy_sctp(struct netns_ipvs *ipvs)
1100 {
1101         return DEFAULT_SLOPPY_SCTP;
1102 }
1103 
1104 static inline int sysctl_sync_ports(struct netns_ipvs *ipvs)
1105 {
1106         return 1;
1107 }
1108 
1109 static inline int sysctl_sync_persist_mode(struct netns_ipvs *ipvs)
1110 {
1111         return 0;
1112 }
1113 
1114 static inline unsigned long sysctl_sync_qlen_max(struct netns_ipvs *ipvs)
1115 {
1116         return IPVS_SYNC_QLEN_MAX;
1117 }
1118 
1119 static inline int sysctl_sync_sock_size(struct netns_ipvs *ipvs)
1120 {
1121         return 0;
1122 }
1123 
1124 static inline int sysctl_pmtu_disc(struct netns_ipvs *ipvs)
1125 {
1126         return 1;
1127 }
1128 
1129 static inline int sysctl_backup_only(struct netns_ipvs *ipvs)
1130 {
1131         return 0;
1132 }
1133 
1134 static inline int sysctl_conn_reuse_mode(struct netns_ipvs *ipvs)
1135 {
1136         return 1;
1137 }
1138 
1139 static inline int sysctl_schedule_icmp(struct netns_ipvs *ipvs)
1140 {
1141         return 0;
1142 }
1143 
1144 static inline int sysctl_ignore_tunneled(struct netns_ipvs *ipvs)
1145 {
1146         return 0;
1147 }
1148 
1149 static inline int sysctl_cache_bypass(struct netns_ipvs *ipvs)
1150 {
1151         return 0;
1152 }
1153 
1154 #endif
1155 
1156 /* IPVS core functions
1157  * (from ip_vs_core.c)
1158  */
1159 const char *ip_vs_proto_name(unsigned int proto);
1160 void ip_vs_init_hash_table(struct list_head *table, int rows);
1161 struct ip_vs_conn *ip_vs_new_conn_out(struct ip_vs_service *svc,
1162                                       struct ip_vs_dest *dest,
1163                                       struct sk_buff *skb,
1164                                       const struct ip_vs_iphdr *iph,
1165                                       __be16 dport,
1166                                       __be16 cport);
1167 #define IP_VS_INIT_HASH_TABLE(t) ip_vs_init_hash_table((t), ARRAY_SIZE((t)))
1168 
1169 #define IP_VS_APP_TYPE_FTP      1
1170 
1171 /* ip_vs_conn handling functions
1172  * (from ip_vs_conn.c)
1173  */
1174 enum {
1175         IP_VS_DIR_INPUT = 0,
1176         IP_VS_DIR_OUTPUT,
1177         IP_VS_DIR_INPUT_ONLY,
1178         IP_VS_DIR_LAST,
1179 };
1180 
1181 static inline void ip_vs_conn_fill_param(struct netns_ipvs *ipvs, int af, int protocol,
1182                                          const union nf_inet_addr *caddr,
1183                                          __be16 cport,
1184                                          const union nf_inet_addr *vaddr,
1185                                          __be16 vport,
1186                                          struct ip_vs_conn_param *p)
1187 {
1188         p->ipvs = ipvs;
1189         p->af = af;
1190         p->protocol = protocol;
1191         p->caddr = caddr;
1192         p->cport = cport;
1193         p->vaddr = vaddr;
1194         p->vport = vport;
1195         p->pe = NULL;
1196         p->pe_data = NULL;
1197 }
1198 
1199 struct ip_vs_conn *ip_vs_conn_in_get(const struct ip_vs_conn_param *p);
1200 struct ip_vs_conn *ip_vs_ct_in_get(const struct ip_vs_conn_param *p);
1201 
1202 struct ip_vs_conn * ip_vs_conn_in_get_proto(struct netns_ipvs *ipvs, int af,
1203                                             const struct sk_buff *skb,
1204                                             const struct ip_vs_iphdr *iph);
1205 
1206 struct ip_vs_conn *ip_vs_conn_out_get(const struct ip_vs_conn_param *p);
1207 
1208 struct ip_vs_conn * ip_vs_conn_out_get_proto(struct netns_ipvs *ipvs, int af,
1209                                              const struct sk_buff *skb,
1210                                              const struct ip_vs_iphdr *iph);
1211 
1212 /* Get reference to gain full access to conn.
1213  * By default, RCU read-side critical sections have access only to
1214  * conn fields and its PE data, see ip_vs_conn_rcu_free() for reference.
1215  */
1216 static inline bool __ip_vs_conn_get(struct ip_vs_conn *cp)
1217 {
1218         return refcount_inc_not_zero(&cp->refcnt);
1219 }
1220 
1221 /* put back the conn without restarting its timer */
1222 static inline void __ip_vs_conn_put(struct ip_vs_conn *cp)
1223 {
1224         smp_mb__before_atomic();
1225         refcount_dec(&cp->refcnt);
1226 }
1227 void ip_vs_conn_put(struct ip_vs_conn *cp);
1228 void ip_vs_conn_fill_cport(struct ip_vs_conn *cp, __be16 cport);
1229 
1230 struct ip_vs_conn *ip_vs_conn_new(const struct ip_vs_conn_param *p, int dest_af,
1231                                   const union nf_inet_addr *daddr,
1232                                   __be16 dport, unsigned int flags,
1233                                   struct ip_vs_dest *dest, __u32 fwmark);
1234 void ip_vs_conn_expire_now(struct ip_vs_conn *cp);
1235 
1236 const char *ip_vs_state_name(const struct ip_vs_conn *cp);
1237 
1238 void ip_vs_tcp_conn_listen(struct ip_vs_conn *cp);
1239 int ip_vs_check_template(struct ip_vs_conn *ct, struct ip_vs_dest *cdest);
1240 void ip_vs_random_dropentry(struct netns_ipvs *ipvs);
1241 int ip_vs_conn_init(void);
1242 void ip_vs_conn_cleanup(void);
1243 
1244 static inline void ip_vs_control_del(struct ip_vs_conn *cp)
1245 {
1246         struct ip_vs_conn *ctl_cp = cp->control;
1247         if (!ctl_cp) {
1248                 IP_VS_ERR_BUF("request control DEL for uncontrolled: "
1249                               "%s:%d to %s:%d\n",
1250                               IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1251                               ntohs(cp->cport),
1252                               IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1253                               ntohs(cp->vport));
1254 
1255                 return;
1256         }
1257 
1258         IP_VS_DBG_BUF(7, "DELeting control for: "
1259                       "cp.dst=%s:%d ctl_cp.dst=%s:%d\n",
1260                       IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1261                       ntohs(cp->cport),
1262                       IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr),
1263                       ntohs(ctl_cp->cport));
1264 
1265         cp->control = NULL;
1266         if (atomic_read(&ctl_cp->n_control) == 0) {
1267                 IP_VS_ERR_BUF("BUG control DEL with n=0 : "
1268                               "%s:%d to %s:%d\n",
1269                               IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1270                               ntohs(cp->cport),
1271                               IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1272                               ntohs(cp->vport));
1273 
1274                 return;
1275         }
1276         atomic_dec(&ctl_cp->n_control);
1277 }
1278 
1279 static inline void
1280 ip_vs_control_add(struct ip_vs_conn *cp, struct ip_vs_conn *ctl_cp)
1281 {
1282         if (cp->control) {
1283                 IP_VS_ERR_BUF("request control ADD for already controlled: "
1284                               "%s:%d to %s:%d\n",
1285                               IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1286                               ntohs(cp->cport),
1287                               IP_VS_DBG_ADDR(cp->af, &cp->vaddr),
1288                               ntohs(cp->vport));
1289 
1290                 ip_vs_control_del(cp);
1291         }
1292 
1293         IP_VS_DBG_BUF(7, "ADDing control for: "
1294                       "cp.dst=%s:%d ctl_cp.dst=%s:%d\n",
1295                       IP_VS_DBG_ADDR(cp->af, &cp->caddr),
1296                       ntohs(cp->cport),
1297                       IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr),
1298                       ntohs(ctl_cp->cport));
1299 
1300         cp->control = ctl_cp;
1301         atomic_inc(&ctl_cp->n_control);
1302 }
1303 
1304 /* Mark our template as assured */
1305 static inline void
1306 ip_vs_control_assure_ct(struct ip_vs_conn *cp)
1307 {
1308         struct ip_vs_conn *ct = cp->control;
1309 
1310         if (ct && !(ct->state & IP_VS_CTPL_S_ASSURED) &&
1311             (ct->flags & IP_VS_CONN_F_TEMPLATE))
1312                 ct->state |= IP_VS_CTPL_S_ASSURED;
1313 }
1314 
1315 /* IPVS netns init & cleanup functions */
1316 int ip_vs_estimator_net_init(struct netns_ipvs *ipvs);
1317 int ip_vs_control_net_init(struct netns_ipvs *ipvs);
1318 int ip_vs_protocol_net_init(struct netns_ipvs *ipvs);
1319 int ip_vs_app_net_init(struct netns_ipvs *ipvs);
1320 int ip_vs_conn_net_init(struct netns_ipvs *ipvs);
1321 int ip_vs_sync_net_init(struct netns_ipvs *ipvs);
1322 void ip_vs_conn_net_cleanup(struct netns_ipvs *ipvs);
1323 void ip_vs_app_net_cleanup(struct netns_ipvs *ipvs);
1324 void ip_vs_protocol_net_cleanup(struct netns_ipvs *ipvs);
1325 void ip_vs_control_net_cleanup(struct netns_ipvs *ipvs);
1326 void ip_vs_estimator_net_cleanup(struct netns_ipvs *ipvs);
1327 void ip_vs_sync_net_cleanup(struct netns_ipvs *ipvs);
1328 void ip_vs_service_net_cleanup(struct netns_ipvs *ipvs);
1329 
1330 /* IPVS application functions
1331  * (from ip_vs_app.c)
1332  */
1333 #define IP_VS_APP_MAX_PORTS  8
1334 struct ip_vs_app *register_ip_vs_app(struct netns_ipvs *ipvs, struct ip_vs_app *app);
1335 void unregister_ip_vs_app(struct netns_ipvs *ipvs, struct ip_vs_app *app);
1336 int ip_vs_bind_app(struct ip_vs_conn *cp, struct ip_vs_protocol *pp);
1337 void ip_vs_unbind_app(struct ip_vs_conn *cp);
1338 int register_ip_vs_app_inc(struct netns_ipvs *ipvs, struct ip_vs_app *app, __u16 proto,
1339                            __u16 port);
1340 int ip_vs_app_inc_get(struct ip_vs_app *inc);
1341 void ip_vs_app_inc_put(struct ip_vs_app *inc);
1342 
1343 int ip_vs_app_pkt_out(struct ip_vs_conn *, struct sk_buff *skb,
1344                       struct ip_vs_iphdr *ipvsh);
1345 int ip_vs_app_pkt_in(struct ip_vs_conn *, struct sk_buff *skb,
1346                      struct ip_vs_iphdr *ipvsh);
1347 
1348 int register_ip_vs_pe(struct ip_vs_pe *pe);
1349 int unregister_ip_vs_pe(struct ip_vs_pe *pe);
1350 struct ip_vs_pe *ip_vs_pe_getbyname(const char *name);
1351 struct ip_vs_pe *__ip_vs_pe_getbyname(const char *pe_name);
1352 
1353 /* Use a #define to avoid all of module.h just for these trivial ops */
1354 #define ip_vs_pe_get(pe)                        \
1355         if (pe && pe->module)                   \
1356                 __module_get(pe->module);
1357 
1358 #define ip_vs_pe_put(pe)                        \
1359         if (pe && pe->module)                   \
1360                 module_put(pe->module);
1361 
1362 /* IPVS protocol functions (from ip_vs_proto.c) */
1363 int ip_vs_protocol_init(void);
1364 void ip_vs_protocol_cleanup(void);
1365 void ip_vs_protocol_timeout_change(struct netns_ipvs *ipvs, int flags);
1366 int *ip_vs_create_timeout_table(int *table, int size);
1367 void ip_vs_tcpudp_debug_packet(int af, struct ip_vs_protocol *pp,
1368                                const struct sk_buff *skb, int offset,
1369                                const char *msg);
1370 
1371 extern struct ip_vs_protocol ip_vs_protocol_tcp;
1372 extern struct ip_vs_protocol ip_vs_protocol_udp;
1373 extern struct ip_vs_protocol ip_vs_protocol_icmp;
1374 extern struct ip_vs_protocol ip_vs_protocol_esp;
1375 extern struct ip_vs_protocol ip_vs_protocol_ah;
1376 extern struct ip_vs_protocol ip_vs_protocol_sctp;
1377 
1378 /* Registering/unregistering scheduler functions
1379  * (from ip_vs_sched.c)
1380  */
1381 int register_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
1382 int unregister_ip_vs_scheduler(struct ip_vs_scheduler *scheduler);
1383 int ip_vs_bind_scheduler(struct ip_vs_service *svc,
1384                          struct ip_vs_scheduler *scheduler);
1385 void ip_vs_unbind_scheduler(struct ip_vs_service *svc,
1386                             struct ip_vs_scheduler *sched);
1387 struct ip_vs_scheduler *ip_vs_scheduler_get(const char *sched_name);
1388 void ip_vs_scheduler_put(struct ip_vs_scheduler *scheduler);
1389 struct ip_vs_conn *
1390 ip_vs_schedule(struct ip_vs_service *svc, struct sk_buff *skb,
1391                struct ip_vs_proto_data *pd, int *ignored,
1392                struct ip_vs_iphdr *iph);
1393 int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb,
1394                 struct ip_vs_proto_data *pd, struct ip_vs_iphdr *iph);
1395 
1396 void ip_vs_scheduler_err(struct ip_vs_service *svc, const char *msg);
1397 
1398 /* IPVS control data and functions (from ip_vs_ctl.c) */
1399 extern struct ip_vs_stats ip_vs_stats;
1400 extern int sysctl_ip_vs_sync_ver;
1401 
1402 struct ip_vs_service *
1403 ip_vs_service_find(struct netns_ipvs *ipvs, int af, __u32 fwmark, __u16 protocol,
1404                   const union nf_inet_addr *vaddr, __be16 vport);
1405 
1406 bool ip_vs_has_real_service(struct netns_ipvs *ipvs, int af, __u16 protocol,
1407                             const union nf_inet_addr *daddr, __be16 dport);
1408 
1409 struct ip_vs_dest *
1410 ip_vs_find_real_service(struct netns_ipvs *ipvs, int af, __u16 protocol,
1411                         const union nf_inet_addr *daddr, __be16 dport);
1412 struct ip_vs_dest *ip_vs_find_tunnel(struct netns_ipvs *ipvs, int af,
1413                                      const union nf_inet_addr *daddr,
1414                                      __be16 tun_port);
1415 
1416 int ip_vs_use_count_inc(void);
1417 void ip_vs_use_count_dec(void);
1418 int ip_vs_register_nl_ioctl(void);
1419 void ip_vs_unregister_nl_ioctl(void);
1420 int ip_vs_control_init(void);
1421 void ip_vs_control_cleanup(void);
1422 struct ip_vs_dest *
1423 ip_vs_find_dest(struct netns_ipvs *ipvs, int svc_af, int dest_af,
1424                 const union nf_inet_addr *daddr, __be16 dport,
1425                 const union nf_inet_addr *vaddr, __be16 vport,
1426                 __u16 protocol, __u32 fwmark, __u32 flags);
1427 void ip_vs_try_bind_dest(struct ip_vs_conn *cp);
1428 
1429 static inline void ip_vs_dest_hold(struct ip_vs_dest *dest)
1430 {
1431         refcount_inc(&dest->refcnt);
1432 }
1433 
1434 static inline void ip_vs_dest_put(struct ip_vs_dest *dest)
1435 {
1436         smp_mb__before_atomic();
1437         refcount_dec(&dest->refcnt);
1438 }
1439 
1440 static inline void ip_vs_dest_put_and_free(struct ip_vs_dest *dest)
1441 {
1442         if (refcount_dec_and_test(&dest->refcnt))
1443                 kfree(dest);
1444 }
1445 
1446 /* IPVS sync daemon data and function prototypes
1447  * (from ip_vs_sync.c)
1448  */
1449 int start_sync_thread(struct netns_ipvs *ipvs, struct ipvs_sync_daemon_cfg *cfg,
1450                       int state);
1451 int stop_sync_thread(struct netns_ipvs *ipvs, int state);
1452 void ip_vs_sync_conn(struct netns_ipvs *ipvs, struct ip_vs_conn *cp, int pkts);
1453 
1454 /* IPVS rate estimator prototypes (from ip_vs_est.c) */
1455 void ip_vs_start_estimator(struct netns_ipvs *ipvs, struct ip_vs_stats *stats);
1456 void ip_vs_stop_estimator(struct netns_ipvs *ipvs, struct ip_vs_stats *stats);
1457 void ip_vs_zero_estimator(struct ip_vs_stats *stats);
1458 void ip_vs_read_estimator(struct ip_vs_kstats *dst, struct ip_vs_stats *stats);
1459 
1460 /* Various IPVS packet transmitters (from ip_vs_xmit.c) */
1461 int ip_vs_null_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1462                     struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1463 int ip_vs_bypass_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1464                       struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1465 int ip_vs_nat_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1466                    struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1467 int ip_vs_tunnel_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1468                       struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1469 int ip_vs_dr_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1470                   struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1471 int ip_vs_icmp_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
1472                     struct ip_vs_protocol *pp, int offset,
1473                     unsigned int hooknum, struct ip_vs_iphdr *iph);
1474 void ip_vs_dest_dst_rcu_free(struct rcu_head *head);
1475 
1476 #ifdef CONFIG_IP_VS_IPV6
1477 int ip_vs_bypass_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1478                          struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1479 int ip_vs_nat_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1480                       struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1481 int ip_vs_tunnel_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1482                          struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1483 int ip_vs_dr_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1484                      struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph);
1485 int ip_vs_icmp_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
1486                        struct ip_vs_protocol *pp, int offset,
1487                        unsigned int hooknum, struct ip_vs_iphdr *iph);
1488 #endif
1489 
1490 #ifdef CONFIG_SYSCTL
1491 /* This is a simple mechanism to ignore packets when
1492  * we are loaded. Just set ip_vs_drop_rate to 'n' and
1493  * we start to drop 1/rate of the packets
1494  */
1495 static inline int ip_vs_todrop(struct netns_ipvs *ipvs)
1496 {
1497         if (!ipvs->drop_rate)
1498                 return 0;
1499         if (--ipvs->drop_counter > 0)
1500                 return 0;
1501         ipvs->drop_counter = ipvs->drop_rate;
1502         return 1;
1503 }
1504 #else
1505 static inline int ip_vs_todrop(struct netns_ipvs *ipvs) { return 0; }
1506 #endif
1507 
1508 #define IP_VS_DFWD_METHOD(dest) (atomic_read(&(dest)->conn_flags) & \
1509                                  IP_VS_CONN_F_FWD_MASK)
1510 
1511 /* ip_vs_fwd_tag returns the forwarding tag of the connection */
1512 #define IP_VS_FWD_METHOD(cp)  (cp->flags & IP_VS_CONN_F_FWD_MASK)
1513 
1514 static inline char ip_vs_fwd_tag(struct ip_vs_conn *cp)
1515 {
1516         char fwd;
1517 
1518         switch (IP_VS_FWD_METHOD(cp)) {
1519         case IP_VS_CONN_F_MASQ:
1520                 fwd = 'M'; break;
1521         case IP_VS_CONN_F_LOCALNODE:
1522                 fwd = 'L'; break;
1523         case IP_VS_CONN_F_TUNNEL:
1524                 fwd = 'T'; break;
1525         case IP_VS_CONN_F_DROUTE:
1526                 fwd = 'R'; break;
1527         case IP_VS_CONN_F_BYPASS:
1528                 fwd = 'B'; break;
1529         default:
1530                 fwd = '?'; break;
1531         }
1532         return fwd;
1533 }
1534 
1535 void ip_vs_nat_icmp(struct sk_buff *skb, struct ip_vs_protocol *pp,
1536                     struct ip_vs_conn *cp, int dir);
1537 
1538 #ifdef CONFIG_IP_VS_IPV6
1539 void ip_vs_nat_icmp_v6(struct sk_buff *skb, struct ip_vs_protocol *pp,
1540                        struct ip_vs_conn *cp, int dir);
1541 #endif
1542 
1543 __sum16 ip_vs_checksum_complete(struct sk_buff *skb, int offset);
1544 
1545 static inline __wsum ip_vs_check_diff4(__be32 old, __be32 new, __wsum oldsum)
1546 {
1547         __be32 diff[2] = { ~old, new };
1548 
1549         return csum_partial(diff, sizeof(diff), oldsum);
1550 }
1551 
1552 #ifdef CONFIG_IP_VS_IPV6
1553 static inline __wsum ip_vs_check_diff16(const __be32 *old, const __be32 *new,
1554                                         __wsum oldsum)
1555 {
1556         __be32 diff[8] = { ~old[3], ~old[2], ~old[1], ~old[0],
1557                             new[3],  new[2],  new[1],  new[0] };
1558 
1559         return csum_partial(diff, sizeof(diff), oldsum);
1560 }
1561 #endif
1562 
1563 static inline __wsum ip_vs_check_diff2(__be16 old, __be16 new, __wsum oldsum)
1564 {
1565         __be16 diff[2] = { ~old, new };
1566 
1567         return csum_partial(diff, sizeof(diff), oldsum);
1568 }
1569 
1570 /* Forget current conntrack (unconfirmed) and attach notrack entry */
1571 static inline void ip_vs_notrack(struct sk_buff *skb)
1572 {
1573 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
1574         enum ip_conntrack_info ctinfo;
1575         struct nf_conn *ct = nf_ct_get(skb, &ctinfo);
1576 
1577         if (ct) {
1578                 nf_conntrack_put(&ct->ct_general);
1579                 nf_ct_set(skb, NULL, IP_CT_UNTRACKED);
1580         }
1581 #endif
1582 }
1583 
1584 #ifdef CONFIG_IP_VS_NFCT
1585 /* Netfilter connection tracking
1586  * (from ip_vs_nfct.c)
1587  */
1588 static inline int ip_vs_conntrack_enabled(struct netns_ipvs *ipvs)
1589 {
1590 #ifdef CONFIG_SYSCTL
1591         return ipvs->sysctl_conntrack;
1592 #else
1593         return 0;
1594 #endif
1595 }
1596 
1597 void ip_vs_update_conntrack(struct sk_buff *skb, struct ip_vs_conn *cp,
1598                             int outin);
1599 int ip_vs_confirm_conntrack(struct sk_buff *skb);
1600 void ip_vs_nfct_expect_related(struct sk_buff *skb, struct nf_conn *ct,
1601                                struct ip_vs_conn *cp, u_int8_t proto,
1602                                const __be16 port, int from_rs);
1603 void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp);
1604 
1605 #else
1606 
1607 static inline int ip_vs_conntrack_enabled(struct netns_ipvs *ipvs)
1608 {
1609         return 0;
1610 }
1611 
1612 static inline void ip_vs_update_conntrack(struct sk_buff *skb,
1613                                           struct ip_vs_conn *cp, int outin)
1614 {
1615 }
1616 
1617 static inline int ip_vs_confirm_conntrack(struct sk_buff *skb)
1618 {
1619         return NF_ACCEPT;
1620 }
1621 
1622 static inline void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp)
1623 {
1624 }
1625 #endif /* CONFIG_IP_VS_NFCT */
1626 
1627 /* Really using conntrack? */
1628 static inline bool ip_vs_conn_uses_conntrack(struct ip_vs_conn *cp,
1629                                              struct sk_buff *skb)
1630 {
1631 #ifdef CONFIG_IP_VS_NFCT
1632         enum ip_conntrack_info ctinfo;
1633         struct nf_conn *ct;
1634 
1635         if (!(cp->flags & IP_VS_CONN_F_NFCT))
1636                 return false;
1637         ct = nf_ct_get(skb, &ctinfo);
1638         if (ct)
1639                 return true;
1640 #endif
1641         return false;
1642 }
1643 
1644 static inline int ip_vs_register_conntrack(struct ip_vs_service *svc)
1645 {
1646 #if IS_ENABLED(CONFIG_NF_CONNTRACK)
1647         int afmask = (svc->af == AF_INET6) ? 2 : 1;
1648         int ret = 0;
1649 
1650         if (!(svc->conntrack_afmask & afmask)) {
1651                 ret = nf_ct_netns_get(svc->ipvs->net, svc->af);
1652                 if (ret >= 0)
1653                         svc->conntrack_afmask |= afmask;
1654         }
1655         return ret;
1656 #else
1657         return 0;
1658 #endif
1659 }
1660 
1661 static inline void ip_vs_unregister_conntrack(struct ip_vs_service *svc)
1662 {
1663 #if IS_ENABLED(CONFIG_NF_CONNTRACK)
1664         int afmask = (svc->af == AF_INET6) ? 2 : 1;
1665 
1666         if (svc->conntrack_afmask & afmask) {
1667                 nf_ct_netns_put(svc->ipvs->net, svc->af);
1668                 svc->conntrack_afmask &= ~afmask;
1669         }
1670 #endif
1671 }
1672 
1673 static inline int
1674 ip_vs_dest_conn_overhead(struct ip_vs_dest *dest)
1675 {
1676         /* We think the overhead of processing active connections is 256
1677          * times higher than that of inactive connections in average. (This
1678          * 256 times might not be accurate, we will change it later) We
1679          * use the following formula to estimate the overhead now:
1680          *                dest->activeconns*256 + dest->inactconns
1681          */
1682         return (atomic_read(&dest->activeconns) << 8) +
1683                 atomic_read(&dest->inactconns);
1684 }
1685 
1686 #endif  /* _NET_IP_VS_H */
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root/include/net/ip_vs.h

INCLUDED FROM

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