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 11 #define IP_VS_VERSION_CODE 0x010201 12 #define NVERSION(version) \ 13 (version >> 16) & 0xFF, \ 14 (version >> 8) & 0xFF, \ 15 version & 0xFF 16 17 /* 18 * Virtual Service Flags 19 */ 20 #define IP_VS_SVC_F_PERSISTENT 0x0001 /* persistent port */ 21 #define IP_VS_SVC_F_HASHED 0x0002 /* hashed entry */ 22 23 /* 24 * Destination Server Flags 25 */ 26 #define IP_VS_DEST_F_AVAILABLE 0x0001 /* server is available */ 27 #define IP_VS_DEST_F_OVERLOAD 0x0002 /* server is overloaded */ 28 29 /* 30 * IPVS sync daemon states 31 */ 32 #define IP_VS_STATE_NONE 0x0000 /* daemon is stopped */ 33 #define IP_VS_STATE_MASTER 0x0001 /* started as master */ 34 #define IP_VS_STATE_BACKUP 0x0002 /* started as backup */ 35 36 /* 37 * IPVS socket options 38 */ 39 #define IP_VS_BASE_CTL (64+1024+64) /* base */ 40 41 #define IP_VS_SO_SET_NONE IP_VS_BASE_CTL /* just peek */ 42 #define IP_VS_SO_SET_INSERT (IP_VS_BASE_CTL+1) 43 #define IP_VS_SO_SET_ADD (IP_VS_BASE_CTL+2) 44 #define IP_VS_SO_SET_EDIT (IP_VS_BASE_CTL+3) 45 #define IP_VS_SO_SET_DEL (IP_VS_BASE_CTL+4) 46 #define IP_VS_SO_SET_FLUSH (IP_VS_BASE_CTL+5) 47 #define IP_VS_SO_SET_LIST (IP_VS_BASE_CTL+6) 48 #define IP_VS_SO_SET_ADDDEST (IP_VS_BASE_CTL+7) 49 #define IP_VS_SO_SET_DELDEST (IP_VS_BASE_CTL+8) 50 #define IP_VS_SO_SET_EDITDEST (IP_VS_BASE_CTL+9) 51 #define IP_VS_SO_SET_TIMEOUT (IP_VS_BASE_CTL+10) 52 #define IP_VS_SO_SET_STARTDAEMON (IP_VS_BASE_CTL+11) 53 #define IP_VS_SO_SET_STOPDAEMON (IP_VS_BASE_CTL+12) 54 #define IP_VS_SO_SET_RESTORE (IP_VS_BASE_CTL+13) 55 #define IP_VS_SO_SET_SAVE (IP_VS_BASE_CTL+14) 56 #define IP_VS_SO_SET_ZERO (IP_VS_BASE_CTL+15) 57 #define IP_VS_SO_SET_MAX IP_VS_SO_SET_ZERO 58 59 #define IP_VS_SO_GET_VERSION IP_VS_BASE_CTL 60 #define IP_VS_SO_GET_INFO (IP_VS_BASE_CTL+1) 61 #define IP_VS_SO_GET_SERVICES (IP_VS_BASE_CTL+2) 62 #define IP_VS_SO_GET_SERVICE (IP_VS_BASE_CTL+3) 63 #define IP_VS_SO_GET_DESTS (IP_VS_BASE_CTL+4) 64 #define IP_VS_SO_GET_DEST (IP_VS_BASE_CTL+5) /* not used now */ 65 #define IP_VS_SO_GET_TIMEOUT (IP_VS_BASE_CTL+6) 66 #define IP_VS_SO_GET_DAEMON (IP_VS_BASE_CTL+7) 67 #define IP_VS_SO_GET_MAX IP_VS_SO_GET_DAEMON 68 69 70 /* 71 * IPVS Connection Flags 72 */ 73 #define IP_VS_CONN_F_FWD_MASK 0x0007 /* mask for the fwd methods */ 74 #define IP_VS_CONN_F_MASQ 0x0000 /* masquerading/NAT */ 75 #define IP_VS_CONN_F_LOCALNODE 0x0001 /* local node */ 76 #define IP_VS_CONN_F_TUNNEL 0x0002 /* tunneling */ 77 #define IP_VS_CONN_F_DROUTE 0x0003 /* direct routing */ 78 #define IP_VS_CONN_F_BYPASS 0x0004 /* cache bypass */ 79 #define IP_VS_CONN_F_SYNC 0x0020 /* entry created by sync */ 80 #define IP_VS_CONN_F_HASHED 0x0040 /* hashed entry */ 81 #define IP_VS_CONN_F_NOOUTPUT 0x0080 /* no output packets */ 82 #define IP_VS_CONN_F_INACTIVE 0x0100 /* not established */ 83 #define IP_VS_CONN_F_OUT_SEQ 0x0200 /* must do output seq adjust */ 84 #define IP_VS_CONN_F_IN_SEQ 0x0400 /* must do input seq adjust */ 85 #define IP_VS_CONN_F_SEQ_MASK 0x0600 /* in/out sequence mask */ 86 #define IP_VS_CONN_F_NO_CPORT 0x0800 /* no client port set yet */ 87 #define IP_VS_CONN_F_TEMPLATE 0x1000 /* template, not connection */ 88 89 /* Move it to better place one day, for now keep it unique */ 90 #define NFC_IPVS_PROPERTY 0x10000 91 92 #define IP_VS_SCHEDNAME_MAXLEN 16 93 #define IP_VS_IFNAME_MAXLEN 16 94 95 96 /* 97 * The struct ip_vs_service_user and struct ip_vs_dest_user are 98 * used to set IPVS rules through setsockopt. 99 */ 100 struct ip_vs_service_user { 101 /* virtual service addresses */ 102 u_int16_t protocol; 103 u_int32_t addr; /* virtual ip address */ 104 u_int16_t port; 105 u_int32_t fwmark; /* firwall mark of service */ 106 107 /* virtual service options */ 108 char sched_name[IP_VS_SCHEDNAME_MAXLEN]; 109 unsigned flags; /* virtual service flags */ 110 unsigned timeout; /* persistent timeout in sec */ 111 u_int32_t netmask; /* persistent netmask */ 112 }; 113 114 115 struct ip_vs_dest_user { 116 /* destination server address */ 117 u_int32_t addr; 118 u_int16_t port; 119 120 /* real server options */ 121 unsigned conn_flags; /* connection flags */ 122 int weight; /* destination weight */ 123 124 /* thresholds for active connections */ 125 u_int32_t u_threshold; /* upper threshold */ 126 u_int32_t l_threshold; /* lower threshold */ 127 }; 128 129 130 /* 131 * IPVS statistics object (for user space) 132 */ 133 struct ip_vs_stats_user 134 { 135 __u32 conns; /* connections scheduled */ 136 __u32 inpkts; /* incoming packets */ 137 __u32 outpkts; /* outgoing packets */ 138 __u64 inbytes; /* incoming bytes */ 139 __u64 outbytes; /* outgoing bytes */ 140 141 __u32 cps; /* current connection rate */ 142 __u32 inpps; /* current in packet rate */ 143 __u32 outpps; /* current out packet rate */ 144 __u32 inbps; /* current in byte rate */ 145 __u32 outbps; /* current out byte rate */ 146 }; 147 148 149 /* The argument to IP_VS_SO_GET_INFO */ 150 struct ip_vs_getinfo { 151 /* version number */ 152 unsigned int version; 153 154 /* size of connection hash table */ 155 unsigned int size; 156 157 /* number of virtual services */ 158 unsigned int num_services; 159 }; 160 161 162 /* The argument to IP_VS_SO_GET_SERVICE */ 163 struct ip_vs_service_entry { 164 /* which service: user fills in these */ 165 u_int16_t protocol; 166 u_int32_t addr; /* virtual address */ 167 u_int16_t port; 168 u_int32_t fwmark; /* firwall mark of service */ 169 170 /* service options */ 171 char sched_name[IP_VS_SCHEDNAME_MAXLEN]; 172 unsigned flags; /* virtual service flags */ 173 unsigned timeout; /* persistent timeout */ 174 u_int32_t netmask; /* persistent netmask */ 175 176 /* number of real servers */ 177 unsigned int num_dests; 178 179 /* statistics */ 180 struct ip_vs_stats_user stats; 181 }; 182 183 184 struct ip_vs_dest_entry { 185 u_int32_t addr; /* destination address */ 186 u_int16_t port; 187 unsigned conn_flags; /* connection flags */ 188 int weight; /* destination weight */ 189 190 u_int32_t u_threshold; /* upper threshold */ 191 u_int32_t l_threshold; /* lower threshold */ 192 193 u_int32_t activeconns; /* active connections */ 194 u_int32_t inactconns; /* inactive connections */ 195 u_int32_t persistconns; /* persistent connections */ 196 197 /* statistics */ 198 struct ip_vs_stats_user stats; 199 }; 200 201 202 /* The argument to IP_VS_SO_GET_DESTS */ 203 struct ip_vs_get_dests { 204 /* which service: user fills in these */ 205 u_int16_t protocol; 206 u_int32_t addr; /* virtual address */ 207 u_int16_t port; 208 u_int32_t fwmark; /* firwall mark of service */ 209 210 /* number of real servers */ 211 unsigned int num_dests; 212 213 /* the real servers */ 214 struct ip_vs_dest_entry entrytable[0]; 215 }; 216 217 218 /* The argument to IP_VS_SO_GET_SERVICES */ 219 struct ip_vs_get_services { 220 /* number of virtual services */ 221 unsigned int num_services; 222 223 /* service table */ 224 struct ip_vs_service_entry entrytable[0]; 225 }; 226 227 228 /* The argument to IP_VS_SO_GET_TIMEOUT */ 229 struct ip_vs_timeout_user { 230 int tcp_timeout; 231 int tcp_fin_timeout; 232 int udp_timeout; 233 }; 234 235 236 /* The argument to IP_VS_SO_GET_DAEMON */ 237 struct ip_vs_daemon_user { 238 /* sync daemon state (master/backup) */ 239 int state; 240 241 /* multicast interface name */ 242 char mcast_ifn[IP_VS_IFNAME_MAXLEN]; 243 244 /* SyncID we belong to */ 245 int syncid; 246 }; 247 248 249 #ifdef __KERNEL__ 250 251 #include <linux/config.h> 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 * IPVS sysctl variables under the /proc/sys/net/ipv4/vs/ 332 */ 333 #define NET_IPV4_VS 21 334 335 enum { 336 NET_IPV4_VS_DEBUG_LEVEL=1, 337 NET_IPV4_VS_AMEMTHRESH=2, 338 NET_IPV4_VS_AMDROPRATE=3, 339 NET_IPV4_VS_DROP_ENTRY=4, 340 NET_IPV4_VS_DROP_PACKET=5, 341 NET_IPV4_VS_SECURE_TCP=6, 342 NET_IPV4_VS_TO_ES=7, 343 NET_IPV4_VS_TO_SS=8, 344 NET_IPV4_VS_TO_SR=9, 345 NET_IPV4_VS_TO_FW=10, 346 NET_IPV4_VS_TO_TW=11, 347 NET_IPV4_VS_TO_CL=12, 348 NET_IPV4_VS_TO_CW=13, 349 NET_IPV4_VS_TO_LA=14, 350 NET_IPV4_VS_TO_LI=15, 351 NET_IPV4_VS_TO_SA=16, 352 NET_IPV4_VS_TO_UDP=17, 353 NET_IPV4_VS_TO_ICMP=18, 354 NET_IPV4_VS_LBLC_EXPIRE=19, 355 NET_IPV4_VS_LBLCR_EXPIRE=20, 356 NET_IPV4_VS_CACHE_BYPASS=22, 357 NET_IPV4_VS_EXPIRE_NODEST_CONN=23, 358 NET_IPV4_VS_SYNC_THRESHOLD=24, 359 NET_IPV4_VS_NAT_ICMP_SEND=25, 360 NET_IPV4_VS_EXPIRE_QUIESCENT_TEMPLATE=26, 361 NET_IPV4_VS_LAST 362 }; 363 364 /* 365 * TCP State Values 366 */ 367 enum { 368 IP_VS_TCP_S_NONE = 0, 369 IP_VS_TCP_S_ESTABLISHED, 370 IP_VS_TCP_S_SYN_SENT, 371 IP_VS_TCP_S_SYN_RECV, 372 IP_VS_TCP_S_FIN_WAIT, 373 IP_VS_TCP_S_TIME_WAIT, 374 IP_VS_TCP_S_CLOSE, 375 IP_VS_TCP_S_CLOSE_WAIT, 376 IP_VS_TCP_S_LAST_ACK, 377 IP_VS_TCP_S_LISTEN, 378 IP_VS_TCP_S_SYNACK, 379 IP_VS_TCP_S_LAST 380 }; 381 382 /* 383 * UDP State Values 384 */ 385 enum { 386 IP_VS_UDP_S_NORMAL, 387 IP_VS_UDP_S_LAST, 388 }; 389 390 /* 391 * ICMP State Values 392 */ 393 enum { 394 IP_VS_ICMP_S_NORMAL, 395 IP_VS_ICMP_S_LAST, 396 }; 397 398 /* 399 * Delta sequence info structure 400 * Each ip_vs_conn has 2 (output AND input seq. changes). 401 * Only used in the VS/NAT. 402 */ 403 struct ip_vs_seq { 404 __u32 init_seq; /* Add delta from this seq */ 405 __u32 delta; /* Delta in sequence numbers */ 406 __u32 previous_delta; /* Delta in sequence numbers 407 before last resized pkt */ 408 }; 409 410 411 /* 412 * IPVS statistics object 413 */ 414 struct ip_vs_stats 415 { 416 __u32 conns; /* connections scheduled */ 417 __u32 inpkts; /* incoming packets */ 418 __u32 outpkts; /* outgoing packets */ 419 __u64 inbytes; /* incoming bytes */ 420 __u64 outbytes; /* outgoing bytes */ 421 422 __u32 cps; /* current connection rate */ 423 __u32 inpps; /* current in packet rate */ 424 __u32 outpps; /* current out packet rate */ 425 __u32 inbps; /* current in byte rate */ 426 __u32 outbps; /* current out byte rate */ 427 428 spinlock_t lock; /* spin lock */ 429 }; 430 431 struct dst_entry; 432 struct iphdr; 433 struct ip_vs_conn; 434 struct ip_vs_app; 435 struct sk_buff; 436 437 struct ip_vs_protocol { 438 struct ip_vs_protocol *next; 439 char *name; 440 __u16 protocol; 441 int dont_defrag; 442 atomic_t appcnt; /* counter of proto app incs */ 443 int *timeout_table; /* protocol timeout table */ 444 445 void (*init)(struct ip_vs_protocol *pp); 446 447 void (*exit)(struct ip_vs_protocol *pp); 448 449 int (*conn_schedule)(struct sk_buff *skb, 450 struct ip_vs_protocol *pp, 451 int *verdict, struct ip_vs_conn **cpp); 452 453 struct ip_vs_conn * 454 (*conn_in_get)(const struct sk_buff *skb, 455 struct ip_vs_protocol *pp, 456 const struct iphdr *iph, 457 unsigned int proto_off, 458 int inverse); 459 460 struct ip_vs_conn * 461 (*conn_out_get)(const struct sk_buff *skb, 462 struct ip_vs_protocol *pp, 463 const struct iphdr *iph, 464 unsigned int proto_off, 465 int inverse); 466 467 int (*snat_handler)(struct sk_buff **pskb, 468 struct ip_vs_protocol *pp, struct ip_vs_conn *cp); 469 470 int (*dnat_handler)(struct sk_buff **pskb, 471 struct ip_vs_protocol *pp, struct ip_vs_conn *cp); 472 473 int (*csum_check)(struct sk_buff *skb, struct ip_vs_protocol *pp); 474 475 const char *(*state_name)(int state); 476 477 int (*state_transition)(struct ip_vs_conn *cp, int direction, 478 const struct sk_buff *skb, 479 struct ip_vs_protocol *pp); 480 481 int (*register_app)(struct ip_vs_app *inc); 482 483 void (*unregister_app)(struct ip_vs_app *inc); 484 485 int (*app_conn_bind)(struct ip_vs_conn *cp); 486 487 void (*debug_packet)(struct ip_vs_protocol *pp, 488 const struct sk_buff *skb, 489 int offset, 490 const char *msg); 491 492 void (*timeout_change)(struct ip_vs_protocol *pp, int flags); 493 494 int (*set_state_timeout)(struct ip_vs_protocol *pp, char *sname, int to); 495 }; 496 497 extern struct ip_vs_protocol * ip_vs_proto_get(unsigned short proto); 498 499 /* 500 * IP_VS structure allocated for each dynamically scheduled connection 501 */ 502 struct ip_vs_conn { 503 struct list_head c_list; /* hashed list heads */ 504 505 /* Protocol, addresses and port numbers */ 506 __u32 caddr; /* client address */ 507 __u32 vaddr; /* virtual address */ 508 __u32 daddr; /* destination address */ 509 __u16 cport; 510 __u16 vport; 511 __u16 dport; 512 __u16 protocol; /* Which protocol (TCP/UDP) */ 513 514 /* counter and timer */ 515 atomic_t refcnt; /* reference count */ 516 struct timer_list timer; /* Expiration timer */ 517 volatile unsigned long timeout; /* timeout */ 518 519 /* Flags and state transition */ 520 spinlock_t lock; /* lock for state transition */ 521 volatile __u16 flags; /* status flags */ 522 volatile __u16 state; /* state info */ 523 524 /* Control members */ 525 struct ip_vs_conn *control; /* Master control connection */ 526 atomic_t n_control; /* Number of controlled ones */ 527 struct ip_vs_dest *dest; /* real server */ 528 atomic_t in_pkts; /* incoming packet counter */ 529 530 /* packet transmitter for different forwarding methods. If it 531 mangles the packet, it must return NF_DROP or better NF_STOLEN, 532 otherwise this must be changed to a sk_buff **. 533 */ 534 int (*packet_xmit)(struct sk_buff *skb, struct ip_vs_conn *cp, 535 struct ip_vs_protocol *pp); 536 537 /* Note: we can group the following members into a structure, 538 in order to save more space, and the following members are 539 only used in VS/NAT anyway */ 540 struct ip_vs_app *app; /* bound ip_vs_app object */ 541 void *app_data; /* Application private data */ 542 struct ip_vs_seq in_seq; /* incoming seq. struct */ 543 struct ip_vs_seq out_seq; /* outgoing seq. struct */ 544 }; 545 546 547 /* 548 * The information about the virtual service offered to the net 549 * and the forwarding entries 550 */ 551 struct ip_vs_service { 552 struct list_head s_list; /* for normal service table */ 553 struct list_head f_list; /* for fwmark-based service table */ 554 atomic_t refcnt; /* reference counter */ 555 atomic_t usecnt; /* use counter */ 556 557 __u16 protocol; /* which protocol (TCP/UDP) */ 558 __u32 addr; /* IP address for virtual service */ 559 __u16 port; /* port number for the service */ 560 __u32 fwmark; /* firewall mark of the service */ 561 unsigned flags; /* service status flags */ 562 unsigned timeout; /* persistent timeout in ticks */ 563 __u32 netmask; /* grouping granularity */ 564 565 struct list_head destinations; /* real server d-linked list */ 566 __u32 num_dests; /* number of servers */ 567 struct ip_vs_stats stats; /* statistics for the service */ 568 struct ip_vs_app *inc; /* bind conns to this app inc */ 569 570 /* for scheduling */ 571 struct ip_vs_scheduler *scheduler; /* bound scheduler object */ 572 rwlock_t sched_lock; /* lock sched_data */ 573 void *sched_data; /* scheduler application data */ 574 }; 575 576 577 /* 578 * The real server destination forwarding entry 579 * with ip address, port number, and so on. 580 */ 581 struct ip_vs_dest { 582 struct list_head n_list; /* for the dests in the service */ 583 struct list_head d_list; /* for table with all the dests */ 584 585 __u32 addr; /* IP address of the server */ 586 __u16 port; /* port number of the server */ 587 volatile unsigned flags; /* dest status flags */ 588 atomic_t conn_flags; /* flags to copy to conn */ 589 atomic_t weight; /* server weight */ 590 591 atomic_t refcnt; /* reference counter */ 592 struct ip_vs_stats stats; /* statistics */ 593 594 /* connection counters and thresholds */ 595 atomic_t activeconns; /* active connections */ 596 atomic_t inactconns; /* inactive connections */ 597 atomic_t persistconns; /* persistent connections */ 598 __u32 u_threshold; /* upper threshold */ 599 __u32 l_threshold; /* lower threshold */ 600 601 /* for destination cache */ 602 spinlock_t dst_lock; /* lock of dst_cache */ 603 struct dst_entry *dst_cache; /* destination cache entry */ 604 u32 dst_rtos; /* RT_TOS(tos) for dst */ 605 606 /* for virtual service */ 607 struct ip_vs_service *svc; /* service it belongs to */ 608 __u16 protocol; /* which protocol (TCP/UDP) */ 609 __u32 vaddr; /* virtual IP address */ 610 __u16 vport; /* virtual port number */ 611 __u32 vfwmark; /* firewall mark of service */ 612 }; 613 614 615 /* 616 * The scheduler object 617 */ 618 struct ip_vs_scheduler { 619 struct list_head n_list; /* d-linked list head */ 620 char *name; /* scheduler name */ 621 atomic_t refcnt; /* reference counter */ 622 struct module *module; /* THIS_MODULE/NULL */ 623 624 /* scheduler initializing service */ 625 int (*init_service)(struct ip_vs_service *svc); 626 /* scheduling service finish */ 627 int (*done_service)(struct ip_vs_service *svc); 628 /* scheduler updating service */ 629 int (*update_service)(struct ip_vs_service *svc); 630 631 /* selecting a server from the given service */ 632 struct ip_vs_dest* (*schedule)(struct ip_vs_service *svc, 633 const struct sk_buff *skb); 634 }; 635 636 637 /* 638 * The application module object (a.k.a. app incarnation) 639 */ 640 struct ip_vs_app 641 { 642 struct list_head a_list; /* member in app list */ 643 int type; /* IP_VS_APP_TYPE_xxx */ 644 char *name; /* application module name */ 645 __u16 protocol; 646 struct module *module; /* THIS_MODULE/NULL */ 647 struct list_head incs_list; /* list of incarnations */ 648 649 /* members for application incarnations */ 650 struct list_head p_list; /* member in proto app list */ 651 struct ip_vs_app *app; /* its real application */ 652 __u16 port; /* port number in net order */ 653 atomic_t usecnt; /* usage counter */ 654 655 /* output hook: return false if can't linearize. diff set for TCP. */ 656 int (*pkt_out)(struct ip_vs_app *, struct ip_vs_conn *, 657 struct sk_buff **, int *diff); 658 659 /* input hook: return false if can't linearize. diff set for TCP. */ 660 int (*pkt_in)(struct ip_vs_app *, struct ip_vs_conn *, 661 struct sk_buff **, int *diff); 662 663 /* ip_vs_app initializer */ 664 int (*init_conn)(struct ip_vs_app *, struct ip_vs_conn *); 665 666 /* ip_vs_app finish */ 667 int (*done_conn)(struct ip_vs_app *, struct ip_vs_conn *); 668 669 670 /* not used now */ 671 int (*bind_conn)(struct ip_vs_app *, struct ip_vs_conn *, 672 struct ip_vs_protocol *); 673 674 void (*unbind_conn)(struct ip_vs_app *, struct ip_vs_conn *); 675 676 int * timeout_table; 677 int * timeouts; 678 int timeouts_size; 679 680 int (*conn_schedule)(struct sk_buff *skb, struct ip_vs_app *app, 681 int *verdict, struct ip_vs_conn **cpp); 682 683 struct ip_vs_conn * 684 (*conn_in_get)(const struct sk_buff *skb, struct ip_vs_app *app, 685 const struct iphdr *iph, unsigned int proto_off, 686 int inverse); 687 688 struct ip_vs_conn * 689 (*conn_out_get)(const struct sk_buff *skb, struct ip_vs_app *app, 690 const struct iphdr *iph, unsigned int proto_off, 691 int inverse); 692 693 int (*state_transition)(struct ip_vs_conn *cp, int direction, 694 const struct sk_buff *skb, 695 struct ip_vs_app *app); 696 697 void (*timeout_change)(struct ip_vs_app *app, int flags); 698 }; 699 700 701 /* 702 * IPVS core functions 703 * (from ip_vs_core.c) 704 */ 705 extern const char *ip_vs_proto_name(unsigned proto); 706 extern void ip_vs_init_hash_table(struct list_head *table, int rows); 707 #define IP_VS_INIT_HASH_TABLE(t) ip_vs_init_hash_table(t, sizeof(t)/sizeof(t[0])) 708 709 #define IP_VS_APP_TYPE_UNSPEC 0 710 #define IP_VS_APP_TYPE_FTP 1 711 712 /* 713 * ip_vs_conn handling functions 714 * (from ip_vs_conn.c) 715 */ 716 717 /* 718 * IPVS connection entry hash table 719 */ 720 #ifndef CONFIG_IP_VS_TAB_BITS 721 #define CONFIG_IP_VS_TAB_BITS 12 722 #endif 723 /* make sure that IP_VS_CONN_TAB_BITS is located in [8, 20] */ 724 #if CONFIG_IP_VS_TAB_BITS < 8 725 #define IP_VS_CONN_TAB_BITS 8 726 #endif 727 #if CONFIG_IP_VS_TAB_BITS > 20 728 #define IP_VS_CONN_TAB_BITS 20 729 #endif 730 #if 8 <= CONFIG_IP_VS_TAB_BITS && CONFIG_IP_VS_TAB_BITS <= 20 731 #define IP_VS_CONN_TAB_BITS CONFIG_IP_VS_TAB_BITS 732 #endif 733 #define IP_VS_CONN_TAB_SIZE (1 << IP_VS_CONN_TAB_BITS) 734 #define IP_VS_CONN_TAB_MASK (IP_VS_CONN_TAB_SIZE - 1) 735 736 enum { 737 IP_VS_DIR_INPUT = 0, 738 IP_VS_DIR_OUTPUT, 739 IP_VS_DIR_INPUT_ONLY, 740 IP_VS_DIR_LAST, 741 }; 742 743 extern struct ip_vs_conn *ip_vs_conn_in_get 744 (int protocol, __u32 s_addr, __u16 s_port, __u32 d_addr, __u16 d_port); 745 extern struct ip_vs_conn *ip_vs_ct_in_get 746 (int protocol, __u32 s_addr, __u16 s_port, __u32 d_addr, __u16 d_port); 747 extern struct ip_vs_conn *ip_vs_conn_out_get 748 (int protocol, __u32 s_addr, __u16 s_port, __u32 d_addr, __u16 d_port); 749 750 /* put back the conn without restarting its timer */ 751 static inline void __ip_vs_conn_put(struct ip_vs_conn *cp) 752 { 753 atomic_dec(&cp->refcnt); 754 } 755 extern void ip_vs_conn_put(struct ip_vs_conn *cp); 756 extern void ip_vs_conn_fill_cport(struct ip_vs_conn *cp, __u16 cport); 757 758 extern struct ip_vs_conn * 759 ip_vs_conn_new(int proto, __u32 caddr, __u16 cport, __u32 vaddr, __u16 vport, 760 __u32 daddr, __u16 dport, unsigned flags, 761 struct ip_vs_dest *dest); 762 extern void ip_vs_conn_expire_now(struct ip_vs_conn *cp); 763 764 extern const char * ip_vs_state_name(__u16 proto, int state); 765 766 extern void ip_vs_tcp_conn_listen(struct ip_vs_conn *cp); 767 extern int ip_vs_check_template(struct ip_vs_conn *ct); 768 extern void ip_vs_secure_tcp_set(int on); 769 extern void ip_vs_random_dropentry(void); 770 extern int ip_vs_conn_init(void); 771 extern void ip_vs_conn_cleanup(void); 772 773 static inline void ip_vs_control_del(struct ip_vs_conn *cp) 774 { 775 struct ip_vs_conn *ctl_cp = cp->control; 776 if (!ctl_cp) { 777 IP_VS_ERR("request control DEL for uncontrolled: " 778 "%d.%d.%d.%d:%d to %d.%d.%d.%d:%d\n", 779 NIPQUAD(cp->caddr),ntohs(cp->cport), 780 NIPQUAD(cp->vaddr),ntohs(cp->vport)); 781 return; 782 } 783 784 IP_VS_DBG(7, "DELeting control for: " 785 "cp.dst=%d.%d.%d.%d:%d ctl_cp.dst=%d.%d.%d.%d:%d\n", 786 NIPQUAD(cp->caddr),ntohs(cp->cport), 787 NIPQUAD(ctl_cp->caddr),ntohs(ctl_cp->cport)); 788 789 cp->control = NULL; 790 if (atomic_read(&ctl_cp->n_control) == 0) { 791 IP_VS_ERR("BUG control DEL with n=0 : " 792 "%d.%d.%d.%d:%d to %d.%d.%d.%d:%d\n", 793 NIPQUAD(cp->caddr),ntohs(cp->cport), 794 NIPQUAD(cp->vaddr),ntohs(cp->vport)); 795 return; 796 } 797 atomic_dec(&ctl_cp->n_control); 798 } 799 800 static inline void 801 ip_vs_control_add(struct ip_vs_conn *cp, struct ip_vs_conn *ctl_cp) 802 { 803 if (cp->control) { 804 IP_VS_ERR("request control ADD for already controlled: " 805 "%d.%d.%d.%d:%d to %d.%d.%d.%d:%d\n", 806 NIPQUAD(cp->caddr),ntohs(cp->cport), 807 NIPQUAD(cp->vaddr),ntohs(cp->vport)); 808 ip_vs_control_del(cp); 809 } 810 811 IP_VS_DBG(7, "ADDing control for: " 812 "cp.dst=%d.%d.%d.%d:%d ctl_cp.dst=%d.%d.%d.%d:%d\n", 813 NIPQUAD(cp->caddr),ntohs(cp->cport), 814 NIPQUAD(ctl_cp->caddr),ntohs(ctl_cp->cport)); 815 816 cp->control = ctl_cp; 817 atomic_inc(&ctl_cp->n_control); 818 } 819 820 821 /* 822 * IPVS application functions 823 * (from ip_vs_app.c) 824 */ 825 #define IP_VS_APP_MAX_PORTS 8 826 extern int register_ip_vs_app(struct ip_vs_app *app); 827 extern void unregister_ip_vs_app(struct ip_vs_app *app); 828 extern int ip_vs_bind_app(struct ip_vs_conn *cp, struct ip_vs_protocol *pp); 829 extern void ip_vs_unbind_app(struct ip_vs_conn *cp); 830 extern int 831 register_ip_vs_app_inc(struct ip_vs_app *app, __u16 proto, __u16 port); 832 extern int ip_vs_app_inc_get(struct ip_vs_app *inc); 833 extern void ip_vs_app_inc_put(struct ip_vs_app *inc); 834 835 extern int ip_vs_app_pkt_out(struct ip_vs_conn *, struct sk_buff **pskb); 836 extern int ip_vs_app_pkt_in(struct ip_vs_conn *, struct sk_buff **pskb); 837 extern int ip_vs_skb_replace(struct sk_buff *skb, gfp_t pri, 838 char *o_buf, int o_len, char *n_buf, int n_len); 839 extern int ip_vs_app_init(void); 840 extern void ip_vs_app_cleanup(void); 841 842 843 /* 844 * IPVS protocol functions (from ip_vs_proto.c) 845 */ 846 extern int ip_vs_protocol_init(void); 847 extern void ip_vs_protocol_cleanup(void); 848 extern void ip_vs_protocol_timeout_change(int flags); 849 extern int *ip_vs_create_timeout_table(int *table, int size); 850 extern int 851 ip_vs_set_state_timeout(int *table, int num, char **names, char *name, int to); 852 extern void 853 ip_vs_tcpudp_debug_packet(struct ip_vs_protocol *pp, const struct sk_buff *skb, 854 int offset, const char *msg); 855 856 extern struct ip_vs_protocol ip_vs_protocol_tcp; 857 extern struct ip_vs_protocol ip_vs_protocol_udp; 858 extern struct ip_vs_protocol ip_vs_protocol_icmp; 859 extern struct ip_vs_protocol ip_vs_protocol_esp; 860 extern struct ip_vs_protocol ip_vs_protocol_ah; 861 862 863 /* 864 * Registering/unregistering scheduler functions 865 * (from ip_vs_sched.c) 866 */ 867 extern int register_ip_vs_scheduler(struct ip_vs_scheduler *scheduler); 868 extern int unregister_ip_vs_scheduler(struct ip_vs_scheduler *scheduler); 869 extern int ip_vs_bind_scheduler(struct ip_vs_service *svc, 870 struct ip_vs_scheduler *scheduler); 871 extern int ip_vs_unbind_scheduler(struct ip_vs_service *svc); 872 extern struct ip_vs_scheduler *ip_vs_scheduler_get(const char *sched_name); 873 extern void ip_vs_scheduler_put(struct ip_vs_scheduler *scheduler); 874 extern struct ip_vs_conn * 875 ip_vs_schedule(struct ip_vs_service *svc, const struct sk_buff *skb); 876 extern int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb, 877 struct ip_vs_protocol *pp); 878 879 880 /* 881 * IPVS control data and functions (from ip_vs_ctl.c) 882 */ 883 extern int sysctl_ip_vs_cache_bypass; 884 extern int sysctl_ip_vs_expire_nodest_conn; 885 extern int sysctl_ip_vs_expire_quiescent_template; 886 extern int sysctl_ip_vs_sync_threshold[2]; 887 extern int sysctl_ip_vs_nat_icmp_send; 888 extern struct ip_vs_stats ip_vs_stats; 889 890 extern struct ip_vs_service * 891 ip_vs_service_get(__u32 fwmark, __u16 protocol, __u32 vaddr, __u16 vport); 892 893 static inline void ip_vs_service_put(struct ip_vs_service *svc) 894 { 895 atomic_dec(&svc->usecnt); 896 } 897 898 extern struct ip_vs_dest * 899 ip_vs_lookup_real_service(__u16 protocol, __u32 daddr, __u16 dport); 900 extern int ip_vs_use_count_inc(void); 901 extern void ip_vs_use_count_dec(void); 902 extern int ip_vs_control_init(void); 903 extern void ip_vs_control_cleanup(void); 904 905 906 /* 907 * IPVS sync daemon data and function prototypes 908 * (from ip_vs_sync.c) 909 */ 910 extern volatile int ip_vs_sync_state; 911 extern volatile int ip_vs_master_syncid; 912 extern volatile int ip_vs_backup_syncid; 913 extern char ip_vs_master_mcast_ifn[IP_VS_IFNAME_MAXLEN]; 914 extern char ip_vs_backup_mcast_ifn[IP_VS_IFNAME_MAXLEN]; 915 extern int start_sync_thread(int state, char *mcast_ifn, __u8 syncid); 916 extern int stop_sync_thread(int state); 917 extern void ip_vs_sync_conn(struct ip_vs_conn *cp); 918 919 920 /* 921 * IPVS rate estimator prototypes (from ip_vs_est.c) 922 */ 923 extern int ip_vs_new_estimator(struct ip_vs_stats *stats); 924 extern void ip_vs_kill_estimator(struct ip_vs_stats *stats); 925 extern void ip_vs_zero_estimator(struct ip_vs_stats *stats); 926 927 /* 928 * Various IPVS packet transmitters (from ip_vs_xmit.c) 929 */ 930 extern int ip_vs_null_xmit 931 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp); 932 extern int ip_vs_bypass_xmit 933 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp); 934 extern int ip_vs_nat_xmit 935 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp); 936 extern int ip_vs_tunnel_xmit 937 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp); 938 extern int ip_vs_dr_xmit 939 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp); 940 extern int ip_vs_icmp_xmit 941 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp, int offset); 942 extern void ip_vs_dst_reset(struct ip_vs_dest *dest); 943 944 945 /* 946 * This is a simple mechanism to ignore packets when 947 * we are loaded. Just set ip_vs_drop_rate to 'n' and 948 * we start to drop 1/rate of the packets 949 */ 950 extern int ip_vs_drop_rate; 951 extern int ip_vs_drop_counter; 952 953 static __inline__ int ip_vs_todrop(void) 954 { 955 if (!ip_vs_drop_rate) return 0; 956 if (--ip_vs_drop_counter > 0) return 0; 957 ip_vs_drop_counter = ip_vs_drop_rate; 958 return 1; 959 } 960 961 /* 962 * ip_vs_fwd_tag returns the forwarding tag of the connection 963 */ 964 #define IP_VS_FWD_METHOD(cp) (cp->flags & IP_VS_CONN_F_FWD_MASK) 965 966 static inline char ip_vs_fwd_tag(struct ip_vs_conn *cp) 967 { 968 char fwd; 969 970 switch (IP_VS_FWD_METHOD(cp)) { 971 case IP_VS_CONN_F_MASQ: 972 fwd = 'M'; break; 973 case IP_VS_CONN_F_LOCALNODE: 974 fwd = 'L'; break; 975 case IP_VS_CONN_F_TUNNEL: 976 fwd = 'T'; break; 977 case IP_VS_CONN_F_DROUTE: 978 fwd = 'R'; break; 979 case IP_VS_CONN_F_BYPASS: 980 fwd = 'B'; break; 981 default: 982 fwd = '?'; break; 983 } 984 return fwd; 985 } 986 987 extern int ip_vs_make_skb_writable(struct sk_buff **pskb, int len); 988 extern void ip_vs_nat_icmp(struct sk_buff *skb, struct ip_vs_protocol *pp, 989 struct ip_vs_conn *cp, int dir); 990 991 extern u16 ip_vs_checksum_complete(struct sk_buff *skb, int offset); 992 993 static inline u16 ip_vs_check_diff(u32 old, u32 new, u16 oldsum) 994 { 995 u32 diff[2] = { old, new }; 996 997 return csum_fold(csum_partial((char *) diff, sizeof(diff), 998 oldsum ^ 0xFFFF)); 999 } 1000 1001 #endif /* __KERNEL__ */ 1002 1003 #endif /* _IP_VS_H */ 1004