1 /* 2 * IP Virtual Server 3 * data structure and functionality definitions 4 */ 5 6 #ifndef _NET_IP_VS_H 7 #define _NET_IP_VS_H 8 9 #include <linux/ip_vs.h> /* definitions shared with userland */ 10 11 /* old ipvsadm versions still include this file directly */ 12 #ifdef __KERNEL__ 13 14 #include <asm/types.h> /* for __uXX types */ 15 16 #include <linux/sysctl.h> /* for ctl_path */ 17 #include <linux/list.h> /* for struct list_head */ 18 #include <linux/spinlock.h> /* for struct rwlock_t */ 19 #include <asm/atomic.h> /* for struct atomic_t */ 20 #include <linux/compiler.h> 21 #include <linux/timer.h> 22 23 #include <net/checksum.h> 24 #include <linux/netfilter.h> /* for union nf_inet_addr */ 25 #include <linux/ipv6.h> /* for struct ipv6hdr */ 26 #include <net/ipv6.h> /* for ipv6_addr_copy */ 27 28 struct ip_vs_iphdr { 29 int len; 30 __u8 protocol; 31 union nf_inet_addr saddr; 32 union nf_inet_addr daddr; 33 }; 34 35 static inline void 36 ip_vs_fill_iphdr(int af, const void *nh, struct ip_vs_iphdr *iphdr) 37 { 38 #ifdef CONFIG_IP_VS_IPV6 39 if (af == AF_INET6) { 40 const struct ipv6hdr *iph = nh; 41 iphdr->len = sizeof(struct ipv6hdr); 42 iphdr->protocol = iph->nexthdr; 43 ipv6_addr_copy(&iphdr->saddr.in6, &iph->saddr); 44 ipv6_addr_copy(&iphdr->daddr.in6, &iph->daddr); 45 } else 46 #endif 47 { 48 const struct iphdr *iph = nh; 49 iphdr->len = iph->ihl * 4; 50 iphdr->protocol = iph->protocol; 51 iphdr->saddr.ip = iph->saddr; 52 iphdr->daddr.ip = iph->daddr; 53 } 54 } 55 56 static inline void ip_vs_addr_copy(int af, union nf_inet_addr *dst, 57 const union nf_inet_addr *src) 58 { 59 #ifdef CONFIG_IP_VS_IPV6 60 if (af == AF_INET6) 61 ipv6_addr_copy(&dst->in6, &src->in6); 62 else 63 #endif 64 dst->ip = src->ip; 65 } 66 67 static inline int ip_vs_addr_equal(int af, const union nf_inet_addr *a, 68 const union nf_inet_addr *b) 69 { 70 #ifdef CONFIG_IP_VS_IPV6 71 if (af == AF_INET6) 72 return ipv6_addr_equal(&a->in6, &b->in6); 73 #endif 74 return a->ip == b->ip; 75 } 76 77 #ifdef CONFIG_IP_VS_DEBUG 78 #include <linux/net.h> 79 80 extern int ip_vs_get_debug_level(void); 81 #define IP_VS_DBG(level, msg...) \ 82 do { \ 83 if (level <= ip_vs_get_debug_level()) \ 84 printk(KERN_DEBUG "IPVS: " msg); \ 85 } while (0) 86 #define IP_VS_DBG_RL(msg...) \ 87 do { \ 88 if (net_ratelimit()) \ 89 printk(KERN_DEBUG "IPVS: " msg); \ 90 } while (0) 91 #define IP_VS_DBG_PKT(level, pp, skb, ofs, msg) \ 92 do { \ 93 if (level <= ip_vs_get_debug_level()) \ 94 pp->debug_packet(pp, skb, ofs, msg); \ 95 } while (0) 96 #define IP_VS_DBG_RL_PKT(level, pp, skb, ofs, msg) \ 97 do { \ 98 if (level <= ip_vs_get_debug_level() && \ 99 net_ratelimit()) \ 100 pp->debug_packet(pp, skb, ofs, msg); \ 101 } while (0) 102 #else /* NO DEBUGGING at ALL */ 103 #define IP_VS_DBG(level, msg...) do {} while (0) 104 #define IP_VS_DBG_RL(msg...) do {} while (0) 105 #define IP_VS_DBG_PKT(level, pp, skb, ofs, msg) do {} while (0) 106 #define IP_VS_DBG_RL_PKT(level, pp, skb, ofs, msg) do {} while (0) 107 #endif 108 109 #define IP_VS_BUG() BUG() 110 #define IP_VS_ERR(msg...) printk(KERN_ERR "IPVS: " msg) 111 #define IP_VS_INFO(msg...) printk(KERN_INFO "IPVS: " msg) 112 #define IP_VS_WARNING(msg...) \ 113 printk(KERN_WARNING "IPVS: " msg) 114 #define IP_VS_ERR_RL(msg...) \ 115 do { \ 116 if (net_ratelimit()) \ 117 printk(KERN_ERR "IPVS: " msg); \ 118 } while (0) 119 120 #ifdef CONFIG_IP_VS_DEBUG 121 #define EnterFunction(level) \ 122 do { \ 123 if (level <= ip_vs_get_debug_level()) \ 124 printk(KERN_DEBUG "Enter: %s, %s line %i\n", \ 125 __FUNCTION__, __FILE__, __LINE__); \ 126 } while (0) 127 #define LeaveFunction(level) \ 128 do { \ 129 if (level <= ip_vs_get_debug_level()) \ 130 printk(KERN_DEBUG "Leave: %s, %s line %i\n", \ 131 __FUNCTION__, __FILE__, __LINE__); \ 132 } while (0) 133 #else 134 #define EnterFunction(level) do {} while (0) 135 #define LeaveFunction(level) do {} while (0) 136 #endif 137 138 #define IP_VS_WAIT_WHILE(expr) while (expr) { cpu_relax(); } 139 140 141 /* 142 * The port number of FTP service (in network order). 143 */ 144 #define FTPPORT __constant_htons(21) 145 #define FTPDATA __constant_htons(20) 146 147 /* 148 * TCP State Values 149 */ 150 enum { 151 IP_VS_TCP_S_NONE = 0, 152 IP_VS_TCP_S_ESTABLISHED, 153 IP_VS_TCP_S_SYN_SENT, 154 IP_VS_TCP_S_SYN_RECV, 155 IP_VS_TCP_S_FIN_WAIT, 156 IP_VS_TCP_S_TIME_WAIT, 157 IP_VS_TCP_S_CLOSE, 158 IP_VS_TCP_S_CLOSE_WAIT, 159 IP_VS_TCP_S_LAST_ACK, 160 IP_VS_TCP_S_LISTEN, 161 IP_VS_TCP_S_SYNACK, 162 IP_VS_TCP_S_LAST 163 }; 164 165 /* 166 * UDP State Values 167 */ 168 enum { 169 IP_VS_UDP_S_NORMAL, 170 IP_VS_UDP_S_LAST, 171 }; 172 173 /* 174 * ICMP State Values 175 */ 176 enum { 177 IP_VS_ICMP_S_NORMAL, 178 IP_VS_ICMP_S_LAST, 179 }; 180 181 /* 182 * Delta sequence info structure 183 * Each ip_vs_conn has 2 (output AND input seq. changes). 184 * Only used in the VS/NAT. 185 */ 186 struct ip_vs_seq { 187 __u32 init_seq; /* Add delta from this seq */ 188 __u32 delta; /* Delta in sequence numbers */ 189 __u32 previous_delta; /* Delta in sequence numbers 190 before last resized pkt */ 191 }; 192 193 194 /* 195 * IPVS statistics objects 196 */ 197 struct ip_vs_estimator { 198 struct list_head list; 199 200 u64 last_inbytes; 201 u64 last_outbytes; 202 u32 last_conns; 203 u32 last_inpkts; 204 u32 last_outpkts; 205 206 u32 cps; 207 u32 inpps; 208 u32 outpps; 209 u32 inbps; 210 u32 outbps; 211 }; 212 213 struct ip_vs_stats 214 { 215 __u32 conns; /* connections scheduled */ 216 __u32 inpkts; /* incoming packets */ 217 __u32 outpkts; /* outgoing packets */ 218 __u64 inbytes; /* incoming bytes */ 219 __u64 outbytes; /* outgoing bytes */ 220 221 __u32 cps; /* current connection rate */ 222 __u32 inpps; /* current in packet rate */ 223 __u32 outpps; /* current out packet rate */ 224 __u32 inbps; /* current in byte rate */ 225 __u32 outbps; /* current out byte rate */ 226 227 /* 228 * Don't add anything before the lock, because we use memcpy() to copy 229 * the members before the lock to struct ip_vs_stats_user in 230 * ip_vs_ctl.c. 231 */ 232 233 spinlock_t lock; /* spin lock */ 234 235 struct ip_vs_estimator est; /* estimator */ 236 }; 237 238 struct dst_entry; 239 struct iphdr; 240 struct ip_vs_conn; 241 struct ip_vs_app; 242 struct sk_buff; 243 244 struct ip_vs_protocol { 245 struct ip_vs_protocol *next; 246 char *name; 247 u16 protocol; 248 u16 num_states; 249 int dont_defrag; 250 atomic_t appcnt; /* counter of proto app incs */ 251 int *timeout_table; /* protocol timeout table */ 252 253 void (*init)(struct ip_vs_protocol *pp); 254 255 void (*exit)(struct ip_vs_protocol *pp); 256 257 int (*conn_schedule)(struct sk_buff *skb, 258 struct ip_vs_protocol *pp, 259 int *verdict, struct ip_vs_conn **cpp); 260 261 struct ip_vs_conn * 262 (*conn_in_get)(const struct sk_buff *skb, 263 struct ip_vs_protocol *pp, 264 const struct iphdr *iph, 265 unsigned int proto_off, 266 int inverse); 267 268 struct ip_vs_conn * 269 (*conn_out_get)(const struct sk_buff *skb, 270 struct ip_vs_protocol *pp, 271 const struct iphdr *iph, 272 unsigned int proto_off, 273 int inverse); 274 275 int (*snat_handler)(struct sk_buff *skb, 276 struct ip_vs_protocol *pp, struct ip_vs_conn *cp); 277 278 int (*dnat_handler)(struct sk_buff *skb, 279 struct ip_vs_protocol *pp, struct ip_vs_conn *cp); 280 281 int (*csum_check)(struct sk_buff *skb, struct ip_vs_protocol *pp); 282 283 const char *(*state_name)(int state); 284 285 int (*state_transition)(struct ip_vs_conn *cp, int direction, 286 const struct sk_buff *skb, 287 struct ip_vs_protocol *pp); 288 289 int (*register_app)(struct ip_vs_app *inc); 290 291 void (*unregister_app)(struct ip_vs_app *inc); 292 293 int (*app_conn_bind)(struct ip_vs_conn *cp); 294 295 void (*debug_packet)(struct ip_vs_protocol *pp, 296 const struct sk_buff *skb, 297 int offset, 298 const char *msg); 299 300 void (*timeout_change)(struct ip_vs_protocol *pp, int flags); 301 302 int (*set_state_timeout)(struct ip_vs_protocol *pp, char *sname, int to); 303 }; 304 305 extern struct ip_vs_protocol * ip_vs_proto_get(unsigned short proto); 306 307 /* 308 * IP_VS structure allocated for each dynamically scheduled connection 309 */ 310 struct ip_vs_conn { 311 struct list_head c_list; /* hashed list heads */ 312 313 /* Protocol, addresses and port numbers */ 314 u16 af; /* address family */ 315 union nf_inet_addr caddr; /* client address */ 316 union nf_inet_addr vaddr; /* virtual address */ 317 union nf_inet_addr daddr; /* destination address */ 318 __be16 cport; 319 __be16 vport; 320 __be16 dport; 321 __u16 protocol; /* Which protocol (TCP/UDP) */ 322 323 /* counter and timer */ 324 atomic_t refcnt; /* reference count */ 325 struct timer_list timer; /* Expiration timer */ 326 volatile unsigned long timeout; /* timeout */ 327 328 /* Flags and state transition */ 329 spinlock_t lock; /* lock for state transition */ 330 volatile __u16 flags; /* status flags */ 331 volatile __u16 state; /* state info */ 332 volatile __u16 old_state; /* old state, to be used for 333 * state transition triggerd 334 * synchronization 335 */ 336 337 /* Control members */ 338 struct ip_vs_conn *control; /* Master control connection */ 339 atomic_t n_control; /* Number of controlled ones */ 340 struct ip_vs_dest *dest; /* real server */ 341 atomic_t in_pkts; /* incoming packet counter */ 342 343 /* packet transmitter for different forwarding methods. If it 344 mangles the packet, it must return NF_DROP or better NF_STOLEN, 345 otherwise this must be changed to a sk_buff **. 346 */ 347 int (*packet_xmit)(struct sk_buff *skb, struct ip_vs_conn *cp, 348 struct ip_vs_protocol *pp); 349 350 /* Note: we can group the following members into a structure, 351 in order to save more space, and the following members are 352 only used in VS/NAT anyway */ 353 struct ip_vs_app *app; /* bound ip_vs_app object */ 354 void *app_data; /* Application private data */ 355 struct ip_vs_seq in_seq; /* incoming seq. struct */ 356 struct ip_vs_seq out_seq; /* outgoing seq. struct */ 357 }; 358 359 360 /* 361 * The information about the virtual service offered to the net 362 * and the forwarding entries 363 */ 364 struct ip_vs_service { 365 struct list_head s_list; /* for normal service table */ 366 struct list_head f_list; /* for fwmark-based service table */ 367 atomic_t refcnt; /* reference counter */ 368 atomic_t usecnt; /* use counter */ 369 370 u16 af; /* address family */ 371 __u16 protocol; /* which protocol (TCP/UDP) */ 372 union nf_inet_addr addr; /* IP address for virtual service */ 373 __be16 port; /* port number for the service */ 374 __u32 fwmark; /* firewall mark of the service */ 375 unsigned flags; /* service status flags */ 376 unsigned timeout; /* persistent timeout in ticks */ 377 __be32 netmask; /* grouping granularity */ 378 379 struct list_head destinations; /* real server d-linked list */ 380 __u32 num_dests; /* number of servers */ 381 struct ip_vs_stats stats; /* statistics for the service */ 382 struct ip_vs_app *inc; /* bind conns to this app inc */ 383 384 /* for scheduling */ 385 struct ip_vs_scheduler *scheduler; /* bound scheduler object */ 386 rwlock_t sched_lock; /* lock sched_data */ 387 void *sched_data; /* scheduler application data */ 388 }; 389 390 391 /* 392 * The real server destination forwarding entry 393 * with ip address, port number, and so on. 394 */ 395 struct ip_vs_dest { 396 struct list_head n_list; /* for the dests in the service */ 397 struct list_head d_list; /* for table with all the dests */ 398 399 u16 af; /* address family */ 400 union nf_inet_addr addr; /* IP address of the server */ 401 __be16 port; /* port number of the server */ 402 volatile unsigned flags; /* dest status flags */ 403 atomic_t conn_flags; /* flags to copy to conn */ 404 atomic_t weight; /* server weight */ 405 406 atomic_t refcnt; /* reference counter */ 407 struct ip_vs_stats stats; /* statistics */ 408 409 /* connection counters and thresholds */ 410 atomic_t activeconns; /* active connections */ 411 atomic_t inactconns; /* inactive connections */ 412 atomic_t persistconns; /* persistent connections */ 413 __u32 u_threshold; /* upper threshold */ 414 __u32 l_threshold; /* lower threshold */ 415 416 /* for destination cache */ 417 spinlock_t dst_lock; /* lock of dst_cache */ 418 struct dst_entry *dst_cache; /* destination cache entry */ 419 u32 dst_rtos; /* RT_TOS(tos) for dst */ 420 421 /* for virtual service */ 422 struct ip_vs_service *svc; /* service it belongs to */ 423 __u16 protocol; /* which protocol (TCP/UDP) */ 424 union nf_inet_addr vaddr; /* virtual IP address */ 425 __be16 vport; /* virtual port number */ 426 __u32 vfwmark; /* firewall mark of service */ 427 }; 428 429 430 /* 431 * The scheduler object 432 */ 433 struct ip_vs_scheduler { 434 struct list_head n_list; /* d-linked list head */ 435 char *name; /* scheduler name */ 436 atomic_t refcnt; /* reference counter */ 437 struct module *module; /* THIS_MODULE/NULL */ 438 439 /* scheduler initializing service */ 440 int (*init_service)(struct ip_vs_service *svc); 441 /* scheduling service finish */ 442 int (*done_service)(struct ip_vs_service *svc); 443 /* scheduler updating service */ 444 int (*update_service)(struct ip_vs_service *svc); 445 446 /* selecting a server from the given service */ 447 struct ip_vs_dest* (*schedule)(struct ip_vs_service *svc, 448 const struct sk_buff *skb); 449 }; 450 451 452 /* 453 * The application module object (a.k.a. app incarnation) 454 */ 455 struct ip_vs_app 456 { 457 struct list_head a_list; /* member in app list */ 458 int type; /* IP_VS_APP_TYPE_xxx */ 459 char *name; /* application module name */ 460 __u16 protocol; 461 struct module *module; /* THIS_MODULE/NULL */ 462 struct list_head incs_list; /* list of incarnations */ 463 464 /* members for application incarnations */ 465 struct list_head p_list; /* member in proto app list */ 466 struct ip_vs_app *app; /* its real application */ 467 __be16 port; /* port number in net order */ 468 atomic_t usecnt; /* usage counter */ 469 470 /* output hook: return false if can't linearize. diff set for TCP. */ 471 int (*pkt_out)(struct ip_vs_app *, struct ip_vs_conn *, 472 struct sk_buff *, int *diff); 473 474 /* input hook: return false if can't linearize. diff set for TCP. */ 475 int (*pkt_in)(struct ip_vs_app *, struct ip_vs_conn *, 476 struct sk_buff *, int *diff); 477 478 /* ip_vs_app initializer */ 479 int (*init_conn)(struct ip_vs_app *, struct ip_vs_conn *); 480 481 /* ip_vs_app finish */ 482 int (*done_conn)(struct ip_vs_app *, struct ip_vs_conn *); 483 484 485 /* not used now */ 486 int (*bind_conn)(struct ip_vs_app *, struct ip_vs_conn *, 487 struct ip_vs_protocol *); 488 489 void (*unbind_conn)(struct ip_vs_app *, struct ip_vs_conn *); 490 491 int * timeout_table; 492 int * timeouts; 493 int timeouts_size; 494 495 int (*conn_schedule)(struct sk_buff *skb, struct ip_vs_app *app, 496 int *verdict, struct ip_vs_conn **cpp); 497 498 struct ip_vs_conn * 499 (*conn_in_get)(const struct sk_buff *skb, struct ip_vs_app *app, 500 const struct iphdr *iph, unsigned int proto_off, 501 int inverse); 502 503 struct ip_vs_conn * 504 (*conn_out_get)(const struct sk_buff *skb, struct ip_vs_app *app, 505 const struct iphdr *iph, unsigned int proto_off, 506 int inverse); 507 508 int (*state_transition)(struct ip_vs_conn *cp, int direction, 509 const struct sk_buff *skb, 510 struct ip_vs_app *app); 511 512 void (*timeout_change)(struct ip_vs_app *app, int flags); 513 }; 514 515 516 /* 517 * IPVS core functions 518 * (from ip_vs_core.c) 519 */ 520 extern const char *ip_vs_proto_name(unsigned proto); 521 extern void ip_vs_init_hash_table(struct list_head *table, int rows); 522 #define IP_VS_INIT_HASH_TABLE(t) ip_vs_init_hash_table((t), ARRAY_SIZE((t))) 523 524 #define IP_VS_APP_TYPE_FTP 1 525 526 /* 527 * ip_vs_conn handling functions 528 * (from ip_vs_conn.c) 529 */ 530 531 /* 532 * IPVS connection entry hash table 533 */ 534 #ifndef CONFIG_IP_VS_TAB_BITS 535 #define CONFIG_IP_VS_TAB_BITS 12 536 #endif 537 /* make sure that IP_VS_CONN_TAB_BITS is located in [8, 20] */ 538 #if CONFIG_IP_VS_TAB_BITS < 8 539 #define IP_VS_CONN_TAB_BITS 8 540 #endif 541 #if CONFIG_IP_VS_TAB_BITS > 20 542 #define IP_VS_CONN_TAB_BITS 20 543 #endif 544 #if 8 <= CONFIG_IP_VS_TAB_BITS && CONFIG_IP_VS_TAB_BITS <= 20 545 #define IP_VS_CONN_TAB_BITS CONFIG_IP_VS_TAB_BITS 546 #endif 547 #define IP_VS_CONN_TAB_SIZE (1 << IP_VS_CONN_TAB_BITS) 548 #define IP_VS_CONN_TAB_MASK (IP_VS_CONN_TAB_SIZE - 1) 549 550 enum { 551 IP_VS_DIR_INPUT = 0, 552 IP_VS_DIR_OUTPUT, 553 IP_VS_DIR_INPUT_ONLY, 554 IP_VS_DIR_LAST, 555 }; 556 557 extern struct ip_vs_conn *ip_vs_conn_in_get 558 (int protocol, __be32 s_addr, __be16 s_port, __be32 d_addr, __be16 d_port); 559 extern struct ip_vs_conn *ip_vs_ct_in_get 560 (int protocol, __be32 s_addr, __be16 s_port, __be32 d_addr, __be16 d_port); 561 extern struct ip_vs_conn *ip_vs_conn_out_get 562 (int protocol, __be32 s_addr, __be16 s_port, __be32 d_addr, __be16 d_port); 563 564 /* put back the conn without restarting its timer */ 565 static inline void __ip_vs_conn_put(struct ip_vs_conn *cp) 566 { 567 atomic_dec(&cp->refcnt); 568 } 569 extern void ip_vs_conn_put(struct ip_vs_conn *cp); 570 extern void ip_vs_conn_fill_cport(struct ip_vs_conn *cp, __be16 cport); 571 572 extern struct ip_vs_conn * 573 ip_vs_conn_new(int proto, __be32 caddr, __be16 cport, __be32 vaddr, __be16 vport, 574 __be32 daddr, __be16 dport, unsigned flags, 575 struct ip_vs_dest *dest); 576 extern void ip_vs_conn_expire_now(struct ip_vs_conn *cp); 577 578 extern const char * ip_vs_state_name(__u16 proto, int state); 579 580 extern void ip_vs_tcp_conn_listen(struct ip_vs_conn *cp); 581 extern int ip_vs_check_template(struct ip_vs_conn *ct); 582 extern void ip_vs_random_dropentry(void); 583 extern int ip_vs_conn_init(void); 584 extern void ip_vs_conn_cleanup(void); 585 586 static inline void ip_vs_control_del(struct ip_vs_conn *cp) 587 { 588 struct ip_vs_conn *ctl_cp = cp->control; 589 if (!ctl_cp) { 590 IP_VS_ERR("request control DEL for uncontrolled: " 591 "%d.%d.%d.%d:%d to %d.%d.%d.%d:%d\n", 592 NIPQUAD(cp->caddr),ntohs(cp->cport), 593 NIPQUAD(cp->vaddr),ntohs(cp->vport)); 594 return; 595 } 596 597 IP_VS_DBG(7, "DELeting control for: " 598 "cp.dst=%d.%d.%d.%d:%d ctl_cp.dst=%d.%d.%d.%d:%d\n", 599 NIPQUAD(cp->caddr),ntohs(cp->cport), 600 NIPQUAD(ctl_cp->caddr),ntohs(ctl_cp->cport)); 601 602 cp->control = NULL; 603 if (atomic_read(&ctl_cp->n_control) == 0) { 604 IP_VS_ERR("BUG control DEL with n=0 : " 605 "%d.%d.%d.%d:%d to %d.%d.%d.%d:%d\n", 606 NIPQUAD(cp->caddr),ntohs(cp->cport), 607 NIPQUAD(cp->vaddr),ntohs(cp->vport)); 608 return; 609 } 610 atomic_dec(&ctl_cp->n_control); 611 } 612 613 static inline void 614 ip_vs_control_add(struct ip_vs_conn *cp, struct ip_vs_conn *ctl_cp) 615 { 616 if (cp->control) { 617 IP_VS_ERR("request control ADD for already controlled: " 618 "%d.%d.%d.%d:%d to %d.%d.%d.%d:%d\n", 619 NIPQUAD(cp->caddr),ntohs(cp->cport), 620 NIPQUAD(cp->vaddr),ntohs(cp->vport)); 621 ip_vs_control_del(cp); 622 } 623 624 IP_VS_DBG(7, "ADDing control for: " 625 "cp.dst=%d.%d.%d.%d:%d ctl_cp.dst=%d.%d.%d.%d:%d\n", 626 NIPQUAD(cp->caddr),ntohs(cp->cport), 627 NIPQUAD(ctl_cp->caddr),ntohs(ctl_cp->cport)); 628 629 cp->control = ctl_cp; 630 atomic_inc(&ctl_cp->n_control); 631 } 632 633 634 /* 635 * IPVS application functions 636 * (from ip_vs_app.c) 637 */ 638 #define IP_VS_APP_MAX_PORTS 8 639 extern int register_ip_vs_app(struct ip_vs_app *app); 640 extern void unregister_ip_vs_app(struct ip_vs_app *app); 641 extern int ip_vs_bind_app(struct ip_vs_conn *cp, struct ip_vs_protocol *pp); 642 extern void ip_vs_unbind_app(struct ip_vs_conn *cp); 643 extern int 644 register_ip_vs_app_inc(struct ip_vs_app *app, __u16 proto, __u16 port); 645 extern int ip_vs_app_inc_get(struct ip_vs_app *inc); 646 extern void ip_vs_app_inc_put(struct ip_vs_app *inc); 647 648 extern int ip_vs_app_pkt_out(struct ip_vs_conn *, struct sk_buff *skb); 649 extern int ip_vs_app_pkt_in(struct ip_vs_conn *, struct sk_buff *skb); 650 extern int ip_vs_skb_replace(struct sk_buff *skb, gfp_t pri, 651 char *o_buf, int o_len, char *n_buf, int n_len); 652 extern int ip_vs_app_init(void); 653 extern void ip_vs_app_cleanup(void); 654 655 656 /* 657 * IPVS protocol functions (from ip_vs_proto.c) 658 */ 659 extern int ip_vs_protocol_init(void); 660 extern void ip_vs_protocol_cleanup(void); 661 extern void ip_vs_protocol_timeout_change(int flags); 662 extern int *ip_vs_create_timeout_table(int *table, int size); 663 extern int 664 ip_vs_set_state_timeout(int *table, int num, char **names, char *name, int to); 665 extern void 666 ip_vs_tcpudp_debug_packet(struct ip_vs_protocol *pp, const struct sk_buff *skb, 667 int offset, const char *msg); 668 669 extern struct ip_vs_protocol ip_vs_protocol_tcp; 670 extern struct ip_vs_protocol ip_vs_protocol_udp; 671 extern struct ip_vs_protocol ip_vs_protocol_icmp; 672 extern struct ip_vs_protocol ip_vs_protocol_esp; 673 extern struct ip_vs_protocol ip_vs_protocol_ah; 674 675 676 /* 677 * Registering/unregistering scheduler functions 678 * (from ip_vs_sched.c) 679 */ 680 extern int register_ip_vs_scheduler(struct ip_vs_scheduler *scheduler); 681 extern int unregister_ip_vs_scheduler(struct ip_vs_scheduler *scheduler); 682 extern int ip_vs_bind_scheduler(struct ip_vs_service *svc, 683 struct ip_vs_scheduler *scheduler); 684 extern int ip_vs_unbind_scheduler(struct ip_vs_service *svc); 685 extern struct ip_vs_scheduler *ip_vs_scheduler_get(const char *sched_name); 686 extern void ip_vs_scheduler_put(struct ip_vs_scheduler *scheduler); 687 extern struct ip_vs_conn * 688 ip_vs_schedule(struct ip_vs_service *svc, const struct sk_buff *skb); 689 extern int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb, 690 struct ip_vs_protocol *pp); 691 692 693 /* 694 * IPVS control data and functions (from ip_vs_ctl.c) 695 */ 696 extern int sysctl_ip_vs_cache_bypass; 697 extern int sysctl_ip_vs_expire_nodest_conn; 698 extern int sysctl_ip_vs_expire_quiescent_template; 699 extern int sysctl_ip_vs_sync_threshold[2]; 700 extern int sysctl_ip_vs_nat_icmp_send; 701 extern struct ip_vs_stats ip_vs_stats; 702 extern const struct ctl_path net_vs_ctl_path[]; 703 704 extern struct ip_vs_service * 705 ip_vs_service_get(__u32 fwmark, __u16 protocol, __be32 vaddr, __be16 vport); 706 707 static inline void ip_vs_service_put(struct ip_vs_service *svc) 708 { 709 atomic_dec(&svc->usecnt); 710 } 711 712 extern struct ip_vs_dest * 713 ip_vs_lookup_real_service(__u16 protocol, __be32 daddr, __be16 dport); 714 extern int ip_vs_use_count_inc(void); 715 extern void ip_vs_use_count_dec(void); 716 extern int ip_vs_control_init(void); 717 extern void ip_vs_control_cleanup(void); 718 extern struct ip_vs_dest * 719 ip_vs_find_dest(__be32 daddr, __be16 dport, 720 __be32 vaddr, __be16 vport, __u16 protocol); 721 extern struct ip_vs_dest *ip_vs_try_bind_dest(struct ip_vs_conn *cp); 722 723 724 /* 725 * IPVS sync daemon data and function prototypes 726 * (from ip_vs_sync.c) 727 */ 728 extern volatile int ip_vs_sync_state; 729 extern volatile int ip_vs_master_syncid; 730 extern volatile int ip_vs_backup_syncid; 731 extern char ip_vs_master_mcast_ifn[IP_VS_IFNAME_MAXLEN]; 732 extern char ip_vs_backup_mcast_ifn[IP_VS_IFNAME_MAXLEN]; 733 extern int start_sync_thread(int state, char *mcast_ifn, __u8 syncid); 734 extern int stop_sync_thread(int state); 735 extern void ip_vs_sync_conn(struct ip_vs_conn *cp); 736 737 738 /* 739 * IPVS rate estimator prototypes (from ip_vs_est.c) 740 */ 741 extern int ip_vs_estimator_init(void); 742 extern void ip_vs_estimator_cleanup(void); 743 extern void ip_vs_new_estimator(struct ip_vs_stats *stats); 744 extern void ip_vs_kill_estimator(struct ip_vs_stats *stats); 745 extern void ip_vs_zero_estimator(struct ip_vs_stats *stats); 746 747 /* 748 * Various IPVS packet transmitters (from ip_vs_xmit.c) 749 */ 750 extern int ip_vs_null_xmit 751 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp); 752 extern int ip_vs_bypass_xmit 753 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp); 754 extern int ip_vs_nat_xmit 755 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp); 756 extern int ip_vs_tunnel_xmit 757 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp); 758 extern int ip_vs_dr_xmit 759 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp); 760 extern int ip_vs_icmp_xmit 761 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp, int offset); 762 extern void ip_vs_dst_reset(struct ip_vs_dest *dest); 763 764 765 /* 766 * This is a simple mechanism to ignore packets when 767 * we are loaded. Just set ip_vs_drop_rate to 'n' and 768 * we start to drop 1/rate of the packets 769 */ 770 extern int ip_vs_drop_rate; 771 extern int ip_vs_drop_counter; 772 773 static __inline__ int ip_vs_todrop(void) 774 { 775 if (!ip_vs_drop_rate) return 0; 776 if (--ip_vs_drop_counter > 0) return 0; 777 ip_vs_drop_counter = ip_vs_drop_rate; 778 return 1; 779 } 780 781 /* 782 * ip_vs_fwd_tag returns the forwarding tag of the connection 783 */ 784 #define IP_VS_FWD_METHOD(cp) (cp->flags & IP_VS_CONN_F_FWD_MASK) 785 786 static inline char ip_vs_fwd_tag(struct ip_vs_conn *cp) 787 { 788 char fwd; 789 790 switch (IP_VS_FWD_METHOD(cp)) { 791 case IP_VS_CONN_F_MASQ: 792 fwd = 'M'; break; 793 case IP_VS_CONN_F_LOCALNODE: 794 fwd = 'L'; break; 795 case IP_VS_CONN_F_TUNNEL: 796 fwd = 'T'; break; 797 case IP_VS_CONN_F_DROUTE: 798 fwd = 'R'; break; 799 case IP_VS_CONN_F_BYPASS: 800 fwd = 'B'; break; 801 default: 802 fwd = '?'; break; 803 } 804 return fwd; 805 } 806 807 extern void ip_vs_nat_icmp(struct sk_buff *skb, struct ip_vs_protocol *pp, 808 struct ip_vs_conn *cp, int dir); 809 810 extern __sum16 ip_vs_checksum_complete(struct sk_buff *skb, int offset); 811 812 static inline __wsum ip_vs_check_diff4(__be32 old, __be32 new, __wsum oldsum) 813 { 814 __be32 diff[2] = { ~old, new }; 815 816 return csum_partial((char *) diff, sizeof(diff), oldsum); 817 } 818 819 static inline __wsum ip_vs_check_diff2(__be16 old, __be16 new, __wsum oldsum) 820 { 821 __be16 diff[2] = { ~old, new }; 822 823 return csum_partial((char *) diff, sizeof(diff), oldsum); 824 } 825 826 #endif /* __KERNEL__ */ 827 828 #endif /* _NET_IP_VS_H */ 829