1 /* 2 * IP Virtual Server 3 * data structure and functionality definitions 4 */ 5 6 #ifndef _IP_VS_H 7 #define _IP_VS_H 8 9 #include <asm/types.h> /* For __uXX types */ 10 #include <linux/types.h> /* For __beXX types in userland */ 11 12 #define IP_VS_VERSION_CODE 0x010201 13 #define NVERSION(version) \ 14 (version >> 16) & 0xFF, \ 15 (version >> 8) & 0xFF, \ 16 version & 0xFF 17 18 /* 19 * Virtual Service Flags 20 */ 21 #define IP_VS_SVC_F_PERSISTENT 0x0001 /* persistent port */ 22 #define IP_VS_SVC_F_HASHED 0x0002 /* hashed entry */ 23 24 /* 25 * Destination Server Flags 26 */ 27 #define IP_VS_DEST_F_AVAILABLE 0x0001 /* server is available */ 28 #define IP_VS_DEST_F_OVERLOAD 0x0002 /* server is overloaded */ 29 30 /* 31 * IPVS sync daemon states 32 */ 33 #define IP_VS_STATE_NONE 0x0000 /* daemon is stopped */ 34 #define IP_VS_STATE_MASTER 0x0001 /* started as master */ 35 #define IP_VS_STATE_BACKUP 0x0002 /* started as backup */ 36 37 /* 38 * IPVS socket options 39 */ 40 #define IP_VS_BASE_CTL (64+1024+64) /* base */ 41 42 #define IP_VS_SO_SET_NONE IP_VS_BASE_CTL /* just peek */ 43 #define IP_VS_SO_SET_INSERT (IP_VS_BASE_CTL+1) 44 #define IP_VS_SO_SET_ADD (IP_VS_BASE_CTL+2) 45 #define IP_VS_SO_SET_EDIT (IP_VS_BASE_CTL+3) 46 #define IP_VS_SO_SET_DEL (IP_VS_BASE_CTL+4) 47 #define IP_VS_SO_SET_FLUSH (IP_VS_BASE_CTL+5) 48 #define IP_VS_SO_SET_LIST (IP_VS_BASE_CTL+6) 49 #define IP_VS_SO_SET_ADDDEST (IP_VS_BASE_CTL+7) 50 #define IP_VS_SO_SET_DELDEST (IP_VS_BASE_CTL+8) 51 #define IP_VS_SO_SET_EDITDEST (IP_VS_BASE_CTL+9) 52 #define IP_VS_SO_SET_TIMEOUT (IP_VS_BASE_CTL+10) 53 #define IP_VS_SO_SET_STARTDAEMON (IP_VS_BASE_CTL+11) 54 #define IP_VS_SO_SET_STOPDAEMON (IP_VS_BASE_CTL+12) 55 #define IP_VS_SO_SET_RESTORE (IP_VS_BASE_CTL+13) 56 #define IP_VS_SO_SET_SAVE (IP_VS_BASE_CTL+14) 57 #define IP_VS_SO_SET_ZERO (IP_VS_BASE_CTL+15) 58 #define IP_VS_SO_SET_MAX IP_VS_SO_SET_ZERO 59 60 #define IP_VS_SO_GET_VERSION IP_VS_BASE_CTL 61 #define IP_VS_SO_GET_INFO (IP_VS_BASE_CTL+1) 62 #define IP_VS_SO_GET_SERVICES (IP_VS_BASE_CTL+2) 63 #define IP_VS_SO_GET_SERVICE (IP_VS_BASE_CTL+3) 64 #define IP_VS_SO_GET_DESTS (IP_VS_BASE_CTL+4) 65 #define IP_VS_SO_GET_DEST (IP_VS_BASE_CTL+5) /* not used now */ 66 #define IP_VS_SO_GET_TIMEOUT (IP_VS_BASE_CTL+6) 67 #define IP_VS_SO_GET_DAEMON (IP_VS_BASE_CTL+7) 68 #define IP_VS_SO_GET_MAX IP_VS_SO_GET_DAEMON 69 70 71 /* 72 * IPVS Connection Flags 73 */ 74 #define IP_VS_CONN_F_FWD_MASK 0x0007 /* mask for the fwd methods */ 75 #define IP_VS_CONN_F_MASQ 0x0000 /* masquerading/NAT */ 76 #define IP_VS_CONN_F_LOCALNODE 0x0001 /* local node */ 77 #define IP_VS_CONN_F_TUNNEL 0x0002 /* tunneling */ 78 #define IP_VS_CONN_F_DROUTE 0x0003 /* direct routing */ 79 #define IP_VS_CONN_F_BYPASS 0x0004 /* cache bypass */ 80 #define IP_VS_CONN_F_SYNC 0x0020 /* entry created by sync */ 81 #define IP_VS_CONN_F_HASHED 0x0040 /* hashed entry */ 82 #define IP_VS_CONN_F_NOOUTPUT 0x0080 /* no output packets */ 83 #define IP_VS_CONN_F_INACTIVE 0x0100 /* not established */ 84 #define IP_VS_CONN_F_OUT_SEQ 0x0200 /* must do output seq adjust */ 85 #define IP_VS_CONN_F_IN_SEQ 0x0400 /* must do input seq adjust */ 86 #define IP_VS_CONN_F_SEQ_MASK 0x0600 /* in/out sequence mask */ 87 #define IP_VS_CONN_F_NO_CPORT 0x0800 /* no client port set yet */ 88 #define IP_VS_CONN_F_TEMPLATE 0x1000 /* template, not connection */ 89 90 /* Move it to better place one day, for now keep it unique */ 91 #define NFC_IPVS_PROPERTY 0x10000 92 93 #define IP_VS_SCHEDNAME_MAXLEN 16 94 #define IP_VS_IFNAME_MAXLEN 16 95 96 97 /* 98 * The struct ip_vs_service_user and struct ip_vs_dest_user are 99 * used to set IPVS rules through setsockopt. 100 */ 101 struct ip_vs_service_user { 102 /* virtual service addresses */ 103 u_int16_t protocol; 104 __be32 addr; /* virtual ip address */ 105 __be16 port; 106 u_int32_t fwmark; /* firwall mark of service */ 107 108 /* virtual service options */ 109 char sched_name[IP_VS_SCHEDNAME_MAXLEN]; 110 unsigned flags; /* virtual service flags */ 111 unsigned timeout; /* persistent timeout in sec */ 112 __be32 netmask; /* persistent netmask */ 113 }; 114 115 116 struct ip_vs_dest_user { 117 /* destination server address */ 118 __be32 addr; 119 __be16 port; 120 121 /* real server options */ 122 unsigned conn_flags; /* connection flags */ 123 int weight; /* destination weight */ 124 125 /* thresholds for active connections */ 126 u_int32_t u_threshold; /* upper threshold */ 127 u_int32_t l_threshold; /* lower threshold */ 128 }; 129 130 131 /* 132 * IPVS statistics object (for user space) 133 */ 134 struct ip_vs_stats_user 135 { 136 __u32 conns; /* connections scheduled */ 137 __u32 inpkts; /* incoming packets */ 138 __u32 outpkts; /* outgoing packets */ 139 __u64 inbytes; /* incoming bytes */ 140 __u64 outbytes; /* outgoing bytes */ 141 142 __u32 cps; /* current connection rate */ 143 __u32 inpps; /* current in packet rate */ 144 __u32 outpps; /* current out packet rate */ 145 __u32 inbps; /* current in byte rate */ 146 __u32 outbps; /* current out byte rate */ 147 }; 148 149 150 /* The argument to IP_VS_SO_GET_INFO */ 151 struct ip_vs_getinfo { 152 /* version number */ 153 unsigned int version; 154 155 /* size of connection hash table */ 156 unsigned int size; 157 158 /* number of virtual services */ 159 unsigned int num_services; 160 }; 161 162 163 /* The argument to IP_VS_SO_GET_SERVICE */ 164 struct ip_vs_service_entry { 165 /* which service: user fills in these */ 166 u_int16_t protocol; 167 __be32 addr; /* virtual address */ 168 __be16 port; 169 u_int32_t fwmark; /* firwall mark of service */ 170 171 /* service options */ 172 char sched_name[IP_VS_SCHEDNAME_MAXLEN]; 173 unsigned flags; /* virtual service flags */ 174 unsigned timeout; /* persistent timeout */ 175 __be32 netmask; /* persistent netmask */ 176 177 /* number of real servers */ 178 unsigned int num_dests; 179 180 /* statistics */ 181 struct ip_vs_stats_user stats; 182 }; 183 184 185 struct ip_vs_dest_entry { 186 __be32 addr; /* destination address */ 187 __be16 port; 188 unsigned conn_flags; /* connection flags */ 189 int weight; /* destination weight */ 190 191 u_int32_t u_threshold; /* upper threshold */ 192 u_int32_t l_threshold; /* lower threshold */ 193 194 u_int32_t activeconns; /* active connections */ 195 u_int32_t inactconns; /* inactive connections */ 196 u_int32_t persistconns; /* persistent connections */ 197 198 /* statistics */ 199 struct ip_vs_stats_user stats; 200 }; 201 202 203 /* The argument to IP_VS_SO_GET_DESTS */ 204 struct ip_vs_get_dests { 205 /* which service: user fills in these */ 206 u_int16_t protocol; 207 __be32 addr; /* virtual address */ 208 __be16 port; 209 u_int32_t fwmark; /* firwall mark of service */ 210 211 /* number of real servers */ 212 unsigned int num_dests; 213 214 /* the real servers */ 215 struct ip_vs_dest_entry entrytable[0]; 216 }; 217 218 219 /* The argument to IP_VS_SO_GET_SERVICES */ 220 struct ip_vs_get_services { 221 /* number of virtual services */ 222 unsigned int num_services; 223 224 /* service table */ 225 struct ip_vs_service_entry entrytable[0]; 226 }; 227 228 229 /* The argument to IP_VS_SO_GET_TIMEOUT */ 230 struct ip_vs_timeout_user { 231 int tcp_timeout; 232 int tcp_fin_timeout; 233 int udp_timeout; 234 }; 235 236 237 /* The argument to IP_VS_SO_GET_DAEMON */ 238 struct ip_vs_daemon_user { 239 /* sync daemon state (master/backup) */ 240 int state; 241 242 /* multicast interface name */ 243 char mcast_ifn[IP_VS_IFNAME_MAXLEN]; 244 245 /* SyncID we belong to */ 246 int syncid; 247 }; 248 249 250 #ifdef __KERNEL__ 251 252 #include <linux/list.h> /* for struct list_head */ 253 #include <linux/spinlock.h> /* for struct rwlock_t */ 254 #include <asm/atomic.h> /* for struct atomic_t */ 255 #include <linux/compiler.h> 256 #include <linux/timer.h> 257 258 #include <net/checksum.h> 259 260 #ifdef CONFIG_IP_VS_DEBUG 261 #include <linux/net.h> 262 263 extern int ip_vs_get_debug_level(void); 264 #define IP_VS_DBG(level, msg...) \ 265 do { \ 266 if (level <= ip_vs_get_debug_level()) \ 267 printk(KERN_DEBUG "IPVS: " msg); \ 268 } while (0) 269 #define IP_VS_DBG_RL(msg...) \ 270 do { \ 271 if (net_ratelimit()) \ 272 printk(KERN_DEBUG "IPVS: " msg); \ 273 } while (0) 274 #define IP_VS_DBG_PKT(level, pp, skb, ofs, msg) \ 275 do { \ 276 if (level <= ip_vs_get_debug_level()) \ 277 pp->debug_packet(pp, skb, ofs, msg); \ 278 } while (0) 279 #define IP_VS_DBG_RL_PKT(level, pp, skb, ofs, msg) \ 280 do { \ 281 if (level <= ip_vs_get_debug_level() && \ 282 net_ratelimit()) \ 283 pp->debug_packet(pp, skb, ofs, msg); \ 284 } while (0) 285 #else /* NO DEBUGGING at ALL */ 286 #define IP_VS_DBG(level, msg...) do {} while (0) 287 #define IP_VS_DBG_RL(msg...) do {} while (0) 288 #define IP_VS_DBG_PKT(level, pp, skb, ofs, msg) do {} while (0) 289 #define IP_VS_DBG_RL_PKT(level, pp, skb, ofs, msg) do {} while (0) 290 #endif 291 292 #define IP_VS_BUG() BUG() 293 #define IP_VS_ERR(msg...) printk(KERN_ERR "IPVS: " msg) 294 #define IP_VS_INFO(msg...) printk(KERN_INFO "IPVS: " msg) 295 #define IP_VS_WARNING(msg...) \ 296 printk(KERN_WARNING "IPVS: " msg) 297 #define IP_VS_ERR_RL(msg...) \ 298 do { \ 299 if (net_ratelimit()) \ 300 printk(KERN_ERR "IPVS: " msg); \ 301 } while (0) 302 303 #ifdef CONFIG_IP_VS_DEBUG 304 #define EnterFunction(level) \ 305 do { \ 306 if (level <= ip_vs_get_debug_level()) \ 307 printk(KERN_DEBUG "Enter: %s, %s line %i\n", \ 308 __FUNCTION__, __FILE__, __LINE__); \ 309 } while (0) 310 #define LeaveFunction(level) \ 311 do { \ 312 if (level <= ip_vs_get_debug_level()) \ 313 printk(KERN_DEBUG "Leave: %s, %s line %i\n", \ 314 __FUNCTION__, __FILE__, __LINE__); \ 315 } while (0) 316 #else 317 #define EnterFunction(level) do {} while (0) 318 #define LeaveFunction(level) do {} while (0) 319 #endif 320 321 #define IP_VS_WAIT_WHILE(expr) while (expr) { cpu_relax(); } 322 323 324 /* 325 * The port number of FTP service (in network order). 326 */ 327 #define FTPPORT __constant_htons(21) 328 #define FTPDATA __constant_htons(20) 329 330 /* 331 * TCP State Values 332 */ 333 enum { 334 IP_VS_TCP_S_NONE = 0, 335 IP_VS_TCP_S_ESTABLISHED, 336 IP_VS_TCP_S_SYN_SENT, 337 IP_VS_TCP_S_SYN_RECV, 338 IP_VS_TCP_S_FIN_WAIT, 339 IP_VS_TCP_S_TIME_WAIT, 340 IP_VS_TCP_S_CLOSE, 341 IP_VS_TCP_S_CLOSE_WAIT, 342 IP_VS_TCP_S_LAST_ACK, 343 IP_VS_TCP_S_LISTEN, 344 IP_VS_TCP_S_SYNACK, 345 IP_VS_TCP_S_LAST 346 }; 347 348 /* 349 * UDP State Values 350 */ 351 enum { 352 IP_VS_UDP_S_NORMAL, 353 IP_VS_UDP_S_LAST, 354 }; 355 356 /* 357 * ICMP State Values 358 */ 359 enum { 360 IP_VS_ICMP_S_NORMAL, 361 IP_VS_ICMP_S_LAST, 362 }; 363 364 /* 365 * Delta sequence info structure 366 * Each ip_vs_conn has 2 (output AND input seq. changes). 367 * Only used in the VS/NAT. 368 */ 369 struct ip_vs_seq { 370 __u32 init_seq; /* Add delta from this seq */ 371 __u32 delta; /* Delta in sequence numbers */ 372 __u32 previous_delta; /* Delta in sequence numbers 373 before last resized pkt */ 374 }; 375 376 377 /* 378 * IPVS statistics object 379 */ 380 struct ip_vs_stats 381 { 382 __u32 conns; /* connections scheduled */ 383 __u32 inpkts; /* incoming packets */ 384 __u32 outpkts; /* outgoing packets */ 385 __u64 inbytes; /* incoming bytes */ 386 __u64 outbytes; /* outgoing bytes */ 387 388 __u32 cps; /* current connection rate */ 389 __u32 inpps; /* current in packet rate */ 390 __u32 outpps; /* current out packet rate */ 391 __u32 inbps; /* current in byte rate */ 392 __u32 outbps; /* current out byte rate */ 393 394 spinlock_t lock; /* spin lock */ 395 }; 396 397 struct dst_entry; 398 struct iphdr; 399 struct ip_vs_conn; 400 struct ip_vs_app; 401 struct sk_buff; 402 403 struct ip_vs_protocol { 404 struct ip_vs_protocol *next; 405 char *name; 406 __u16 protocol; 407 int dont_defrag; 408 atomic_t appcnt; /* counter of proto app incs */ 409 int *timeout_table; /* protocol timeout table */ 410 411 void (*init)(struct ip_vs_protocol *pp); 412 413 void (*exit)(struct ip_vs_protocol *pp); 414 415 int (*conn_schedule)(struct sk_buff *skb, 416 struct ip_vs_protocol *pp, 417 int *verdict, struct ip_vs_conn **cpp); 418 419 struct ip_vs_conn * 420 (*conn_in_get)(const struct sk_buff *skb, 421 struct ip_vs_protocol *pp, 422 const struct iphdr *iph, 423 unsigned int proto_off, 424 int inverse); 425 426 struct ip_vs_conn * 427 (*conn_out_get)(const struct sk_buff *skb, 428 struct ip_vs_protocol *pp, 429 const struct iphdr *iph, 430 unsigned int proto_off, 431 int inverse); 432 433 int (*snat_handler)(struct sk_buff *skb, 434 struct ip_vs_protocol *pp, struct ip_vs_conn *cp); 435 436 int (*dnat_handler)(struct sk_buff *skb, 437 struct ip_vs_protocol *pp, struct ip_vs_conn *cp); 438 439 int (*csum_check)(struct sk_buff *skb, struct ip_vs_protocol *pp); 440 441 const char *(*state_name)(int state); 442 443 int (*state_transition)(struct ip_vs_conn *cp, int direction, 444 const struct sk_buff *skb, 445 struct ip_vs_protocol *pp); 446 447 int (*register_app)(struct ip_vs_app *inc); 448 449 void (*unregister_app)(struct ip_vs_app *inc); 450 451 int (*app_conn_bind)(struct ip_vs_conn *cp); 452 453 void (*debug_packet)(struct ip_vs_protocol *pp, 454 const struct sk_buff *skb, 455 int offset, 456 const char *msg); 457 458 void (*timeout_change)(struct ip_vs_protocol *pp, int flags); 459 460 int (*set_state_timeout)(struct ip_vs_protocol *pp, char *sname, int to); 461 }; 462 463 extern struct ip_vs_protocol * ip_vs_proto_get(unsigned short proto); 464 465 /* 466 * IP_VS structure allocated for each dynamically scheduled connection 467 */ 468 struct ip_vs_conn { 469 struct list_head c_list; /* hashed list heads */ 470 471 /* Protocol, addresses and port numbers */ 472 __be32 caddr; /* client address */ 473 __be32 vaddr; /* virtual address */ 474 __be32 daddr; /* destination address */ 475 __be16 cport; 476 __be16 vport; 477 __be16 dport; 478 __u16 protocol; /* Which protocol (TCP/UDP) */ 479 480 /* counter and timer */ 481 atomic_t refcnt; /* reference count */ 482 struct timer_list timer; /* Expiration timer */ 483 volatile unsigned long timeout; /* timeout */ 484 485 /* Flags and state transition */ 486 spinlock_t lock; /* lock for state transition */ 487 volatile __u16 flags; /* status flags */ 488 volatile __u16 state; /* state info */ 489 volatile __u16 old_state; /* old state, to be used for 490 * state transition triggerd 491 * synchronization 492 */ 493 494 /* Control members */ 495 struct ip_vs_conn *control; /* Master control connection */ 496 atomic_t n_control; /* Number of controlled ones */ 497 struct ip_vs_dest *dest; /* real server */ 498 atomic_t in_pkts; /* incoming packet counter */ 499 500 /* packet transmitter for different forwarding methods. If it 501 mangles the packet, it must return NF_DROP or better NF_STOLEN, 502 otherwise this must be changed to a sk_buff **. 503 */ 504 int (*packet_xmit)(struct sk_buff *skb, struct ip_vs_conn *cp, 505 struct ip_vs_protocol *pp); 506 507 /* Note: we can group the following members into a structure, 508 in order to save more space, and the following members are 509 only used in VS/NAT anyway */ 510 struct ip_vs_app *app; /* bound ip_vs_app object */ 511 void *app_data; /* Application private data */ 512 struct ip_vs_seq in_seq; /* incoming seq. struct */ 513 struct ip_vs_seq out_seq; /* outgoing seq. struct */ 514 }; 515 516 517 /* 518 * The information about the virtual service offered to the net 519 * and the forwarding entries 520 */ 521 struct ip_vs_service { 522 struct list_head s_list; /* for normal service table */ 523 struct list_head f_list; /* for fwmark-based service table */ 524 atomic_t refcnt; /* reference counter */ 525 atomic_t usecnt; /* use counter */ 526 527 __u16 protocol; /* which protocol (TCP/UDP) */ 528 __be32 addr; /* IP address for virtual service */ 529 __be16 port; /* port number for the service */ 530 __u32 fwmark; /* firewall mark of the service */ 531 unsigned flags; /* service status flags */ 532 unsigned timeout; /* persistent timeout in ticks */ 533 __be32 netmask; /* grouping granularity */ 534 535 struct list_head destinations; /* real server d-linked list */ 536 __u32 num_dests; /* number of servers */ 537 struct ip_vs_stats stats; /* statistics for the service */ 538 struct ip_vs_app *inc; /* bind conns to this app inc */ 539 540 /* for scheduling */ 541 struct ip_vs_scheduler *scheduler; /* bound scheduler object */ 542 rwlock_t sched_lock; /* lock sched_data */ 543 void *sched_data; /* scheduler application data */ 544 }; 545 546 547 /* 548 * The real server destination forwarding entry 549 * with ip address, port number, and so on. 550 */ 551 struct ip_vs_dest { 552 struct list_head n_list; /* for the dests in the service */ 553 struct list_head d_list; /* for table with all the dests */ 554 555 __be32 addr; /* IP address of the server */ 556 __be16 port; /* port number of the server */ 557 volatile unsigned flags; /* dest status flags */ 558 atomic_t conn_flags; /* flags to copy to conn */ 559 atomic_t weight; /* server weight */ 560 561 atomic_t refcnt; /* reference counter */ 562 struct ip_vs_stats stats; /* statistics */ 563 564 /* connection counters and thresholds */ 565 atomic_t activeconns; /* active connections */ 566 atomic_t inactconns; /* inactive connections */ 567 atomic_t persistconns; /* persistent connections */ 568 __u32 u_threshold; /* upper threshold */ 569 __u32 l_threshold; /* lower threshold */ 570 571 /* for destination cache */ 572 spinlock_t dst_lock; /* lock of dst_cache */ 573 struct dst_entry *dst_cache; /* destination cache entry */ 574 u32 dst_rtos; /* RT_TOS(tos) for dst */ 575 576 /* for virtual service */ 577 struct ip_vs_service *svc; /* service it belongs to */ 578 __u16 protocol; /* which protocol (TCP/UDP) */ 579 __be32 vaddr; /* virtual IP address */ 580 __be16 vport; /* virtual port number */ 581 __u32 vfwmark; /* firewall mark of service */ 582 }; 583 584 585 /* 586 * The scheduler object 587 */ 588 struct ip_vs_scheduler { 589 struct list_head n_list; /* d-linked list head */ 590 char *name; /* scheduler name */ 591 atomic_t refcnt; /* reference counter */ 592 struct module *module; /* THIS_MODULE/NULL */ 593 594 /* scheduler initializing service */ 595 int (*init_service)(struct ip_vs_service *svc); 596 /* scheduling service finish */ 597 int (*done_service)(struct ip_vs_service *svc); 598 /* scheduler updating service */ 599 int (*update_service)(struct ip_vs_service *svc); 600 601 /* selecting a server from the given service */ 602 struct ip_vs_dest* (*schedule)(struct ip_vs_service *svc, 603 const struct sk_buff *skb); 604 }; 605 606 607 /* 608 * The application module object (a.k.a. app incarnation) 609 */ 610 struct ip_vs_app 611 { 612 struct list_head a_list; /* member in app list */ 613 int type; /* IP_VS_APP_TYPE_xxx */ 614 char *name; /* application module name */ 615 __u16 protocol; 616 struct module *module; /* THIS_MODULE/NULL */ 617 struct list_head incs_list; /* list of incarnations */ 618 619 /* members for application incarnations */ 620 struct list_head p_list; /* member in proto app list */ 621 struct ip_vs_app *app; /* its real application */ 622 __be16 port; /* port number in net order */ 623 atomic_t usecnt; /* usage counter */ 624 625 /* output hook: return false if can't linearize. diff set for TCP. */ 626 int (*pkt_out)(struct ip_vs_app *, struct ip_vs_conn *, 627 struct sk_buff *, int *diff); 628 629 /* input hook: return false if can't linearize. diff set for TCP. */ 630 int (*pkt_in)(struct ip_vs_app *, struct ip_vs_conn *, 631 struct sk_buff *, int *diff); 632 633 /* ip_vs_app initializer */ 634 int (*init_conn)(struct ip_vs_app *, struct ip_vs_conn *); 635 636 /* ip_vs_app finish */ 637 int (*done_conn)(struct ip_vs_app *, struct ip_vs_conn *); 638 639 640 /* not used now */ 641 int (*bind_conn)(struct ip_vs_app *, struct ip_vs_conn *, 642 struct ip_vs_protocol *); 643 644 void (*unbind_conn)(struct ip_vs_app *, struct ip_vs_conn *); 645 646 int * timeout_table; 647 int * timeouts; 648 int timeouts_size; 649 650 int (*conn_schedule)(struct sk_buff *skb, struct ip_vs_app *app, 651 int *verdict, struct ip_vs_conn **cpp); 652 653 struct ip_vs_conn * 654 (*conn_in_get)(const struct sk_buff *skb, struct ip_vs_app *app, 655 const struct iphdr *iph, unsigned int proto_off, 656 int inverse); 657 658 struct ip_vs_conn * 659 (*conn_out_get)(const struct sk_buff *skb, struct ip_vs_app *app, 660 const struct iphdr *iph, unsigned int proto_off, 661 int inverse); 662 663 int (*state_transition)(struct ip_vs_conn *cp, int direction, 664 const struct sk_buff *skb, 665 struct ip_vs_app *app); 666 667 void (*timeout_change)(struct ip_vs_app *app, int flags); 668 }; 669 670 671 /* 672 * IPVS core functions 673 * (from ip_vs_core.c) 674 */ 675 extern const char *ip_vs_proto_name(unsigned proto); 676 extern void ip_vs_init_hash_table(struct list_head *table, int rows); 677 #define IP_VS_INIT_HASH_TABLE(t) ip_vs_init_hash_table(t, sizeof(t)/sizeof(t[0])) 678 679 #define IP_VS_APP_TYPE_UNSPEC 0 680 #define IP_VS_APP_TYPE_FTP 1 681 682 /* 683 * ip_vs_conn handling functions 684 * (from ip_vs_conn.c) 685 */ 686 687 /* 688 * IPVS connection entry hash table 689 */ 690 #ifndef CONFIG_IP_VS_TAB_BITS 691 #define CONFIG_IP_VS_TAB_BITS 12 692 #endif 693 /* make sure that IP_VS_CONN_TAB_BITS is located in [8, 20] */ 694 #if CONFIG_IP_VS_TAB_BITS < 8 695 #define IP_VS_CONN_TAB_BITS 8 696 #endif 697 #if CONFIG_IP_VS_TAB_BITS > 20 698 #define IP_VS_CONN_TAB_BITS 20 699 #endif 700 #if 8 <= CONFIG_IP_VS_TAB_BITS && CONFIG_IP_VS_TAB_BITS <= 20 701 #define IP_VS_CONN_TAB_BITS CONFIG_IP_VS_TAB_BITS 702 #endif 703 #define IP_VS_CONN_TAB_SIZE (1 << IP_VS_CONN_TAB_BITS) 704 #define IP_VS_CONN_TAB_MASK (IP_VS_CONN_TAB_SIZE - 1) 705 706 enum { 707 IP_VS_DIR_INPUT = 0, 708 IP_VS_DIR_OUTPUT, 709 IP_VS_DIR_INPUT_ONLY, 710 IP_VS_DIR_LAST, 711 }; 712 713 extern struct ip_vs_conn *ip_vs_conn_in_get 714 (int protocol, __be32 s_addr, __be16 s_port, __be32 d_addr, __be16 d_port); 715 extern struct ip_vs_conn *ip_vs_ct_in_get 716 (int protocol, __be32 s_addr, __be16 s_port, __be32 d_addr, __be16 d_port); 717 extern struct ip_vs_conn *ip_vs_conn_out_get 718 (int protocol, __be32 s_addr, __be16 s_port, __be32 d_addr, __be16 d_port); 719 720 /* put back the conn without restarting its timer */ 721 static inline void __ip_vs_conn_put(struct ip_vs_conn *cp) 722 { 723 atomic_dec(&cp->refcnt); 724 } 725 extern void ip_vs_conn_put(struct ip_vs_conn *cp); 726 extern void ip_vs_conn_fill_cport(struct ip_vs_conn *cp, __be16 cport); 727 728 extern struct ip_vs_conn * 729 ip_vs_conn_new(int proto, __be32 caddr, __be16 cport, __be32 vaddr, __be16 vport, 730 __be32 daddr, __be16 dport, unsigned flags, 731 struct ip_vs_dest *dest); 732 extern void ip_vs_conn_expire_now(struct ip_vs_conn *cp); 733 734 extern const char * ip_vs_state_name(__u16 proto, int state); 735 736 extern void ip_vs_tcp_conn_listen(struct ip_vs_conn *cp); 737 extern int ip_vs_check_template(struct ip_vs_conn *ct); 738 extern void ip_vs_secure_tcp_set(int on); 739 extern void ip_vs_random_dropentry(void); 740 extern int ip_vs_conn_init(void); 741 extern void ip_vs_conn_cleanup(void); 742 743 static inline void ip_vs_control_del(struct ip_vs_conn *cp) 744 { 745 struct ip_vs_conn *ctl_cp = cp->control; 746 if (!ctl_cp) { 747 IP_VS_ERR("request control DEL for uncontrolled: " 748 "%d.%d.%d.%d:%d to %d.%d.%d.%d:%d\n", 749 NIPQUAD(cp->caddr),ntohs(cp->cport), 750 NIPQUAD(cp->vaddr),ntohs(cp->vport)); 751 return; 752 } 753 754 IP_VS_DBG(7, "DELeting control for: " 755 "cp.dst=%d.%d.%d.%d:%d ctl_cp.dst=%d.%d.%d.%d:%d\n", 756 NIPQUAD(cp->caddr),ntohs(cp->cport), 757 NIPQUAD(ctl_cp->caddr),ntohs(ctl_cp->cport)); 758 759 cp->control = NULL; 760 if (atomic_read(&ctl_cp->n_control) == 0) { 761 IP_VS_ERR("BUG control DEL with n=0 : " 762 "%d.%d.%d.%d:%d to %d.%d.%d.%d:%d\n", 763 NIPQUAD(cp->caddr),ntohs(cp->cport), 764 NIPQUAD(cp->vaddr),ntohs(cp->vport)); 765 return; 766 } 767 atomic_dec(&ctl_cp->n_control); 768 } 769 770 static inline void 771 ip_vs_control_add(struct ip_vs_conn *cp, struct ip_vs_conn *ctl_cp) 772 { 773 if (cp->control) { 774 IP_VS_ERR("request control ADD for already controlled: " 775 "%d.%d.%d.%d:%d to %d.%d.%d.%d:%d\n", 776 NIPQUAD(cp->caddr),ntohs(cp->cport), 777 NIPQUAD(cp->vaddr),ntohs(cp->vport)); 778 ip_vs_control_del(cp); 779 } 780 781 IP_VS_DBG(7, "ADDing control for: " 782 "cp.dst=%d.%d.%d.%d:%d ctl_cp.dst=%d.%d.%d.%d:%d\n", 783 NIPQUAD(cp->caddr),ntohs(cp->cport), 784 NIPQUAD(ctl_cp->caddr),ntohs(ctl_cp->cport)); 785 786 cp->control = ctl_cp; 787 atomic_inc(&ctl_cp->n_control); 788 } 789 790 791 /* 792 * IPVS application functions 793 * (from ip_vs_app.c) 794 */ 795 #define IP_VS_APP_MAX_PORTS 8 796 extern int register_ip_vs_app(struct ip_vs_app *app); 797 extern void unregister_ip_vs_app(struct ip_vs_app *app); 798 extern int ip_vs_bind_app(struct ip_vs_conn *cp, struct ip_vs_protocol *pp); 799 extern void ip_vs_unbind_app(struct ip_vs_conn *cp); 800 extern int 801 register_ip_vs_app_inc(struct ip_vs_app *app, __u16 proto, __u16 port); 802 extern int ip_vs_app_inc_get(struct ip_vs_app *inc); 803 extern void ip_vs_app_inc_put(struct ip_vs_app *inc); 804 805 extern int ip_vs_app_pkt_out(struct ip_vs_conn *, struct sk_buff *skb); 806 extern int ip_vs_app_pkt_in(struct ip_vs_conn *, struct sk_buff *skb); 807 extern int ip_vs_skb_replace(struct sk_buff *skb, gfp_t pri, 808 char *o_buf, int o_len, char *n_buf, int n_len); 809 extern int ip_vs_app_init(void); 810 extern void ip_vs_app_cleanup(void); 811 812 813 /* 814 * IPVS protocol functions (from ip_vs_proto.c) 815 */ 816 extern int ip_vs_protocol_init(void); 817 extern void ip_vs_protocol_cleanup(void); 818 extern void ip_vs_protocol_timeout_change(int flags); 819 extern int *ip_vs_create_timeout_table(int *table, int size); 820 extern int 821 ip_vs_set_state_timeout(int *table, int num, char **names, char *name, int to); 822 extern void 823 ip_vs_tcpudp_debug_packet(struct ip_vs_protocol *pp, const struct sk_buff *skb, 824 int offset, const char *msg); 825 826 extern struct ip_vs_protocol ip_vs_protocol_tcp; 827 extern struct ip_vs_protocol ip_vs_protocol_udp; 828 extern struct ip_vs_protocol ip_vs_protocol_icmp; 829 extern struct ip_vs_protocol ip_vs_protocol_esp; 830 extern struct ip_vs_protocol ip_vs_protocol_ah; 831 832 833 /* 834 * Registering/unregistering scheduler functions 835 * (from ip_vs_sched.c) 836 */ 837 extern int register_ip_vs_scheduler(struct ip_vs_scheduler *scheduler); 838 extern int unregister_ip_vs_scheduler(struct ip_vs_scheduler *scheduler); 839 extern int ip_vs_bind_scheduler(struct ip_vs_service *svc, 840 struct ip_vs_scheduler *scheduler); 841 extern int ip_vs_unbind_scheduler(struct ip_vs_service *svc); 842 extern struct ip_vs_scheduler *ip_vs_scheduler_get(const char *sched_name); 843 extern void ip_vs_scheduler_put(struct ip_vs_scheduler *scheduler); 844 extern struct ip_vs_conn * 845 ip_vs_schedule(struct ip_vs_service *svc, const struct sk_buff *skb); 846 extern int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb, 847 struct ip_vs_protocol *pp); 848 849 850 /* 851 * IPVS control data and functions (from ip_vs_ctl.c) 852 */ 853 extern int sysctl_ip_vs_cache_bypass; 854 extern int sysctl_ip_vs_expire_nodest_conn; 855 extern int sysctl_ip_vs_expire_quiescent_template; 856 extern int sysctl_ip_vs_sync_threshold[2]; 857 extern int sysctl_ip_vs_nat_icmp_send; 858 extern struct ip_vs_stats ip_vs_stats; 859 860 extern struct ip_vs_service * 861 ip_vs_service_get(__u32 fwmark, __u16 protocol, __be32 vaddr, __be16 vport); 862 863 static inline void ip_vs_service_put(struct ip_vs_service *svc) 864 { 865 atomic_dec(&svc->usecnt); 866 } 867 868 extern struct ip_vs_dest * 869 ip_vs_lookup_real_service(__u16 protocol, __be32 daddr, __be16 dport); 870 extern int ip_vs_use_count_inc(void); 871 extern void ip_vs_use_count_dec(void); 872 extern int ip_vs_control_init(void); 873 extern void ip_vs_control_cleanup(void); 874 extern struct ip_vs_dest * 875 ip_vs_find_dest(__be32 daddr, __be16 dport, 876 __be32 vaddr, __be16 vport, __u16 protocol); 877 extern struct ip_vs_dest *ip_vs_try_bind_dest(struct ip_vs_conn *cp); 878 879 880 /* 881 * IPVS sync daemon data and function prototypes 882 * (from ip_vs_sync.c) 883 */ 884 extern volatile int ip_vs_sync_state; 885 extern volatile int ip_vs_master_syncid; 886 extern volatile int ip_vs_backup_syncid; 887 extern char ip_vs_master_mcast_ifn[IP_VS_IFNAME_MAXLEN]; 888 extern char ip_vs_backup_mcast_ifn[IP_VS_IFNAME_MAXLEN]; 889 extern int start_sync_thread(int state, char *mcast_ifn, __u8 syncid); 890 extern int stop_sync_thread(int state); 891 extern void ip_vs_sync_conn(struct ip_vs_conn *cp); 892 893 894 /* 895 * IPVS rate estimator prototypes (from ip_vs_est.c) 896 */ 897 extern int ip_vs_new_estimator(struct ip_vs_stats *stats); 898 extern void ip_vs_kill_estimator(struct ip_vs_stats *stats); 899 extern void ip_vs_zero_estimator(struct ip_vs_stats *stats); 900 901 /* 902 * Various IPVS packet transmitters (from ip_vs_xmit.c) 903 */ 904 extern int ip_vs_null_xmit 905 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp); 906 extern int ip_vs_bypass_xmit 907 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp); 908 extern int ip_vs_nat_xmit 909 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp); 910 extern int ip_vs_tunnel_xmit 911 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp); 912 extern int ip_vs_dr_xmit 913 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp); 914 extern int ip_vs_icmp_xmit 915 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp, int offset); 916 extern void ip_vs_dst_reset(struct ip_vs_dest *dest); 917 918 919 /* 920 * This is a simple mechanism to ignore packets when 921 * we are loaded. Just set ip_vs_drop_rate to 'n' and 922 * we start to drop 1/rate of the packets 923 */ 924 extern int ip_vs_drop_rate; 925 extern int ip_vs_drop_counter; 926 927 static __inline__ int ip_vs_todrop(void) 928 { 929 if (!ip_vs_drop_rate) return 0; 930 if (--ip_vs_drop_counter > 0) return 0; 931 ip_vs_drop_counter = ip_vs_drop_rate; 932 return 1; 933 } 934 935 /* 936 * ip_vs_fwd_tag returns the forwarding tag of the connection 937 */ 938 #define IP_VS_FWD_METHOD(cp) (cp->flags & IP_VS_CONN_F_FWD_MASK) 939 940 static inline char ip_vs_fwd_tag(struct ip_vs_conn *cp) 941 { 942 char fwd; 943 944 switch (IP_VS_FWD_METHOD(cp)) { 945 case IP_VS_CONN_F_MASQ: 946 fwd = 'M'; break; 947 case IP_VS_CONN_F_LOCALNODE: 948 fwd = 'L'; break; 949 case IP_VS_CONN_F_TUNNEL: 950 fwd = 'T'; break; 951 case IP_VS_CONN_F_DROUTE: 952 fwd = 'R'; break; 953 case IP_VS_CONN_F_BYPASS: 954 fwd = 'B'; break; 955 default: 956 fwd = '?'; break; 957 } 958 return fwd; 959 } 960 961 extern void ip_vs_nat_icmp(struct sk_buff *skb, struct ip_vs_protocol *pp, 962 struct ip_vs_conn *cp, int dir); 963 964 extern __sum16 ip_vs_checksum_complete(struct sk_buff *skb, int offset); 965 966 static inline __wsum ip_vs_check_diff4(__be32 old, __be32 new, __wsum oldsum) 967 { 968 __be32 diff[2] = { ~old, new }; 969 970 return csum_partial((char *) diff, sizeof(diff), oldsum); 971 } 972 973 static inline __wsum ip_vs_check_diff2(__be16 old, __be16 new, __wsum oldsum) 974 { 975 __be16 diff[2] = { ~old, new }; 976 977 return csum_partial((char *) diff, sizeof(diff), oldsum); 978 } 979 980 #endif /* __KERNEL__ */ 981 982 #endif /* _IP_VS_H */ 983