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