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