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 88 /* Move it to better place one day, for now keep it unique */ 89 #define NFC_IPVS_PROPERTY 0x10000 90 91 #define IP_VS_SCHEDNAME_MAXLEN 16 92 #define IP_VS_IFNAME_MAXLEN 16 93 94 95 /* 96 * The struct ip_vs_service_user and struct ip_vs_dest_user are 97 * used to set IPVS rules through setsockopt. 98 */ 99 struct ip_vs_service_user { 100 /* virtual service addresses */ 101 u_int16_t protocol; 102 u_int32_t addr; /* virtual ip address */ 103 u_int16_t port; 104 u_int32_t fwmark; /* firwall mark of service */ 105 106 /* virtual service options */ 107 char sched_name[IP_VS_SCHEDNAME_MAXLEN]; 108 unsigned flags; /* virtual service flags */ 109 unsigned timeout; /* persistent timeout in sec */ 110 u_int32_t netmask; /* persistent netmask */ 111 }; 112 113 114 struct ip_vs_dest_user { 115 /* destination server address */ 116 u_int32_t addr; 117 u_int16_t port; 118 119 /* real server options */ 120 unsigned conn_flags; /* connection flags */ 121 int weight; /* destination weight */ 122 123 /* thresholds for active connections */ 124 u_int32_t u_threshold; /* upper threshold */ 125 u_int32_t l_threshold; /* lower threshold */ 126 }; 127 128 129 /* 130 * IPVS statistics object (for user space) 131 */ 132 struct ip_vs_stats_user 133 { 134 __u32 conns; /* connections scheduled */ 135 __u32 inpkts; /* incoming packets */ 136 __u32 outpkts; /* outgoing packets */ 137 __u64 inbytes; /* incoming bytes */ 138 __u64 outbytes; /* outgoing bytes */ 139 140 __u32 cps; /* current connection rate */ 141 __u32 inpps; /* current in packet rate */ 142 __u32 outpps; /* current out packet rate */ 143 __u32 inbps; /* current in byte rate */ 144 __u32 outbps; /* current out byte rate */ 145 }; 146 147 148 /* The argument to IP_VS_SO_GET_INFO */ 149 struct ip_vs_getinfo { 150 /* version number */ 151 unsigned int version; 152 153 /* size of connection hash table */ 154 unsigned int size; 155 156 /* number of virtual services */ 157 unsigned int num_services; 158 }; 159 160 161 /* The argument to IP_VS_SO_GET_SERVICE */ 162 struct ip_vs_service_entry { 163 /* which service: user fills in these */ 164 u_int16_t protocol; 165 u_int32_t addr; /* virtual address */ 166 u_int16_t port; 167 u_int32_t fwmark; /* firwall mark of service */ 168 169 /* service options */ 170 char sched_name[IP_VS_SCHEDNAME_MAXLEN]; 171 unsigned flags; /* virtual service flags */ 172 unsigned timeout; /* persistent timeout */ 173 u_int32_t netmask; /* persistent netmask */ 174 175 /* number of real servers */ 176 unsigned int num_dests; 177 178 /* statistics */ 179 struct ip_vs_stats_user stats; 180 }; 181 182 183 struct ip_vs_dest_entry { 184 u_int32_t addr; /* destination address */ 185 u_int16_t port; 186 unsigned conn_flags; /* connection flags */ 187 int weight; /* destination weight */ 188 189 u_int32_t u_threshold; /* upper threshold */ 190 u_int32_t l_threshold; /* lower threshold */ 191 192 u_int32_t activeconns; /* active connections */ 193 u_int32_t inactconns; /* inactive connections */ 194 u_int32_t persistconns; /* persistent connections */ 195 196 /* statistics */ 197 struct ip_vs_stats_user stats; 198 }; 199 200 201 /* The argument to IP_VS_SO_GET_DESTS */ 202 struct ip_vs_get_dests { 203 /* which service: user fills in these */ 204 u_int16_t protocol; 205 u_int32_t addr; /* virtual address */ 206 u_int16_t port; 207 u_int32_t fwmark; /* firwall mark of service */ 208 209 /* number of real servers */ 210 unsigned int num_dests; 211 212 /* the real servers */ 213 struct ip_vs_dest_entry entrytable[0]; 214 }; 215 216 217 /* The argument to IP_VS_SO_GET_SERVICES */ 218 struct ip_vs_get_services { 219 /* number of virtual services */ 220 unsigned int num_services; 221 222 /* service table */ 223 struct ip_vs_service_entry entrytable[0]; 224 }; 225 226 227 /* The argument to IP_VS_SO_GET_TIMEOUT */ 228 struct ip_vs_timeout_user { 229 int tcp_timeout; 230 int tcp_fin_timeout; 231 int udp_timeout; 232 }; 233 234 235 /* The argument to IP_VS_SO_GET_DAEMON */ 236 struct ip_vs_daemon_user { 237 /* sync daemon state (master/backup) */ 238 int state; 239 240 /* multicast interface name */ 241 char mcast_ifn[IP_VS_IFNAME_MAXLEN]; 242 243 /* SyncID we belong to */ 244 int syncid; 245 }; 246 247 248 #ifdef __KERNEL__ 249 250 #include <linux/config.h> 251 #include <linux/list.h> /* for struct list_head */ 252 #include <linux/spinlock.h> /* for struct rwlock_t */ 253 #include <linux/skbuff.h> /* for struct sk_buff */ 254 #include <linux/ip.h> /* for struct iphdr */ 255 #include <asm/atomic.h> /* for struct atomic_t */ 256 #include <linux/netdevice.h> /* for struct neighbour */ 257 #include <net/dst.h> /* for struct dst_entry */ 258 #include <net/tcp.h> 259 #include <net/udp.h> 260 #include <linux/compiler.h> 261 262 263 #ifdef CONFIG_IP_VS_DEBUG 264 extern int ip_vs_get_debug_level(void); 265 #define IP_VS_DBG(level, msg...) \ 266 do { \ 267 if (level <= ip_vs_get_debug_level()) \ 268 printk(KERN_DEBUG "IPVS: " msg); \ 269 } while (0) 270 #define IP_VS_DBG_RL(msg...) \ 271 do { \ 272 if (net_ratelimit()) \ 273 printk(KERN_DEBUG "IPVS: " msg); \ 274 } while (0) 275 #define IP_VS_DBG_PKT(level, pp, skb, ofs, msg) \ 276 do { \ 277 if (level <= ip_vs_get_debug_level()) \ 278 pp->debug_packet(pp, skb, ofs, msg); \ 279 } while (0) 280 #define IP_VS_DBG_RL_PKT(level, pp, skb, ofs, msg) \ 281 do { \ 282 if (level <= ip_vs_get_debug_level() && \ 283 net_ratelimit()) \ 284 pp->debug_packet(pp, skb, ofs, msg); \ 285 } while (0) 286 #else /* NO DEBUGGING at ALL */ 287 #define IP_VS_DBG(level, msg...) do {} while (0) 288 #define IP_VS_DBG_RL(msg...) do {} while (0) 289 #define IP_VS_DBG_PKT(level, pp, skb, ofs, msg) do {} while (0) 290 #define IP_VS_DBG_RL_PKT(level, pp, skb, ofs, msg) do {} while (0) 291 #endif 292 293 #define IP_VS_BUG() BUG() 294 #define IP_VS_ERR(msg...) printk(KERN_ERR "IPVS: " msg) 295 #define IP_VS_INFO(msg...) printk(KERN_INFO "IPVS: " msg) 296 #define IP_VS_WARNING(msg...) \ 297 printk(KERN_WARNING "IPVS: " msg) 298 #define IP_VS_ERR_RL(msg...) \ 299 do { \ 300 if (net_ratelimit()) \ 301 printk(KERN_ERR "IPVS: " msg); \ 302 } while (0) 303 304 #ifdef CONFIG_IP_VS_DEBUG 305 #define EnterFunction(level) \ 306 do { \ 307 if (level <= ip_vs_get_debug_level()) \ 308 printk(KERN_DEBUG "Enter: %s, %s line %i\n", \ 309 __FUNCTION__, __FILE__, __LINE__); \ 310 } while (0) 311 #define LeaveFunction(level) \ 312 do { \ 313 if (level <= ip_vs_get_debug_level()) \ 314 printk(KERN_DEBUG "Leave: %s, %s line %i\n", \ 315 __FUNCTION__, __FILE__, __LINE__); \ 316 } while (0) 317 #else 318 #define EnterFunction(level) do {} while (0) 319 #define LeaveFunction(level) do {} while (0) 320 #endif 321 322 #define IP_VS_WAIT_WHILE(expr) while (expr) { cpu_relax(); } 323 324 325 /* 326 * The port number of FTP service (in network order). 327 */ 328 #define FTPPORT __constant_htons(21) 329 #define FTPDATA __constant_htons(20) 330 331 /* 332 * IPVS sysctl variables under the /proc/sys/net/ipv4/vs/ 333 */ 334 #define NET_IPV4_VS 21 335 336 enum { 337 NET_IPV4_VS_DEBUG_LEVEL=1, 338 NET_IPV4_VS_AMEMTHRESH=2, 339 NET_IPV4_VS_AMDROPRATE=3, 340 NET_IPV4_VS_DROP_ENTRY=4, 341 NET_IPV4_VS_DROP_PACKET=5, 342 NET_IPV4_VS_SECURE_TCP=6, 343 NET_IPV4_VS_TO_ES=7, 344 NET_IPV4_VS_TO_SS=8, 345 NET_IPV4_VS_TO_SR=9, 346 NET_IPV4_VS_TO_FW=10, 347 NET_IPV4_VS_TO_TW=11, 348 NET_IPV4_VS_TO_CL=12, 349 NET_IPV4_VS_TO_CW=13, 350 NET_IPV4_VS_TO_LA=14, 351 NET_IPV4_VS_TO_LI=15, 352 NET_IPV4_VS_TO_SA=16, 353 NET_IPV4_VS_TO_UDP=17, 354 NET_IPV4_VS_TO_ICMP=18, 355 NET_IPV4_VS_LBLC_EXPIRE=19, 356 NET_IPV4_VS_LBLCR_EXPIRE=20, 357 NET_IPV4_VS_CACHE_BYPASS=22, 358 NET_IPV4_VS_EXPIRE_NODEST_CONN=23, 359 NET_IPV4_VS_SYNC_THRESHOLD=24, 360 NET_IPV4_VS_NAT_ICMP_SEND=25, 361 NET_IPV4_VS_EXPIRE_QUIESCENT_TEMPLATE=26, 362 NET_IPV4_VS_LAST 363 }; 364 365 /* 366 * TCP State Values 367 */ 368 enum { 369 IP_VS_TCP_S_NONE = 0, 370 IP_VS_TCP_S_ESTABLISHED, 371 IP_VS_TCP_S_SYN_SENT, 372 IP_VS_TCP_S_SYN_RECV, 373 IP_VS_TCP_S_FIN_WAIT, 374 IP_VS_TCP_S_TIME_WAIT, 375 IP_VS_TCP_S_CLOSE, 376 IP_VS_TCP_S_CLOSE_WAIT, 377 IP_VS_TCP_S_LAST_ACK, 378 IP_VS_TCP_S_LISTEN, 379 IP_VS_TCP_S_SYNACK, 380 IP_VS_TCP_S_LAST 381 }; 382 383 /* 384 * UDP State Values 385 */ 386 enum { 387 IP_VS_UDP_S_NORMAL, 388 IP_VS_UDP_S_LAST, 389 }; 390 391 /* 392 * ICMP State Values 393 */ 394 enum { 395 IP_VS_ICMP_S_NORMAL, 396 IP_VS_ICMP_S_LAST, 397 }; 398 399 /* 400 * Delta sequence info structure 401 * Each ip_vs_conn has 2 (output AND input seq. changes). 402 * Only used in the VS/NAT. 403 */ 404 struct ip_vs_seq { 405 __u32 init_seq; /* Add delta from this seq */ 406 __u32 delta; /* Delta in sequence numbers */ 407 __u32 previous_delta; /* Delta in sequence numbers 408 before last resized pkt */ 409 }; 410 411 412 /* 413 * IPVS statistics object 414 */ 415 struct ip_vs_stats 416 { 417 __u32 conns; /* connections scheduled */ 418 __u32 inpkts; /* incoming packets */ 419 __u32 outpkts; /* outgoing packets */ 420 __u64 inbytes; /* incoming bytes */ 421 __u64 outbytes; /* outgoing bytes */ 422 423 __u32 cps; /* current connection rate */ 424 __u32 inpps; /* current in packet rate */ 425 __u32 outpps; /* current out packet rate */ 426 __u32 inbps; /* current in byte rate */ 427 __u32 outbps; /* current out byte rate */ 428 429 spinlock_t lock; /* spin lock */ 430 }; 431 432 struct ip_vs_conn; 433 struct ip_vs_app; 434 435 struct ip_vs_protocol { 436 struct ip_vs_protocol *next; 437 char *name; 438 __u16 protocol; 439 int dont_defrag; 440 atomic_t appcnt; /* counter of proto app incs */ 441 int *timeout_table; /* protocol timeout table */ 442 443 void (*init)(struct ip_vs_protocol *pp); 444 445 void (*exit)(struct ip_vs_protocol *pp); 446 447 int (*conn_schedule)(struct sk_buff *skb, 448 struct ip_vs_protocol *pp, 449 int *verdict, struct ip_vs_conn **cpp); 450 451 struct ip_vs_conn * 452 (*conn_in_get)(const struct sk_buff *skb, 453 struct ip_vs_protocol *pp, 454 const struct iphdr *iph, 455 unsigned int proto_off, 456 int inverse); 457 458 struct ip_vs_conn * 459 (*conn_out_get)(const struct sk_buff *skb, 460 struct ip_vs_protocol *pp, 461 const struct iphdr *iph, 462 unsigned int proto_off, 463 int inverse); 464 465 int (*snat_handler)(struct sk_buff **pskb, 466 struct ip_vs_protocol *pp, struct ip_vs_conn *cp); 467 468 int (*dnat_handler)(struct sk_buff **pskb, 469 struct ip_vs_protocol *pp, struct ip_vs_conn *cp); 470 471 int (*csum_check)(struct sk_buff *skb, struct ip_vs_protocol *pp); 472 473 const char *(*state_name)(int state); 474 475 int (*state_transition)(struct ip_vs_conn *cp, int direction, 476 const struct sk_buff *skb, 477 struct ip_vs_protocol *pp); 478 479 int (*register_app)(struct ip_vs_app *inc); 480 481 void (*unregister_app)(struct ip_vs_app *inc); 482 483 int (*app_conn_bind)(struct ip_vs_conn *cp); 484 485 void (*debug_packet)(struct ip_vs_protocol *pp, 486 const struct sk_buff *skb, 487 int offset, 488 const char *msg); 489 490 void (*timeout_change)(struct ip_vs_protocol *pp, int flags); 491 492 int (*set_state_timeout)(struct ip_vs_protocol *pp, char *sname, int to); 493 }; 494 495 extern struct ip_vs_protocol * ip_vs_proto_get(unsigned short proto); 496 497 /* 498 * IP_VS structure allocated for each dynamically scheduled connection 499 */ 500 struct ip_vs_conn { 501 struct list_head c_list; /* hashed list heads */ 502 503 /* Protocol, addresses and port numbers */ 504 __u32 caddr; /* client address */ 505 __u32 vaddr; /* virtual address */ 506 __u32 daddr; /* destination address */ 507 __u16 cport; 508 __u16 vport; 509 __u16 dport; 510 __u16 protocol; /* Which protocol (TCP/UDP) */ 511 512 /* counter and timer */ 513 atomic_t refcnt; /* reference count */ 514 struct timer_list timer; /* Expiration timer */ 515 volatile unsigned long timeout; /* timeout */ 516 517 /* Flags and state transition */ 518 spinlock_t lock; /* lock for state transition */ 519 volatile __u16 flags; /* status flags */ 520 volatile __u16 state; /* state info */ 521 522 /* Control members */ 523 struct ip_vs_conn *control; /* Master control connection */ 524 atomic_t n_control; /* Number of controlled ones */ 525 struct ip_vs_dest *dest; /* real server */ 526 atomic_t in_pkts; /* incoming packet counter */ 527 528 /* packet transmitter for different forwarding methods. If it 529 mangles the packet, it must return NF_DROP or better NF_STOLEN, 530 otherwise this must be changed to a sk_buff **. 531 */ 532 int (*packet_xmit)(struct sk_buff *skb, struct ip_vs_conn *cp, 533 struct ip_vs_protocol *pp); 534 535 /* Note: we can group the following members into a structure, 536 in order to save more space, and the following members are 537 only used in VS/NAT anyway */ 538 struct ip_vs_app *app; /* bound ip_vs_app object */ 539 void *app_data; /* Application private data */ 540 struct ip_vs_seq in_seq; /* incoming seq. struct */ 541 struct ip_vs_seq out_seq; /* outgoing seq. struct */ 542 }; 543 544 545 /* 546 * The information about the virtual service offered to the net 547 * and the forwarding entries 548 */ 549 struct ip_vs_service { 550 struct list_head s_list; /* for normal service table */ 551 struct list_head f_list; /* for fwmark-based service table */ 552 atomic_t refcnt; /* reference counter */ 553 atomic_t usecnt; /* use counter */ 554 555 __u16 protocol; /* which protocol (TCP/UDP) */ 556 __u32 addr; /* IP address for virtual service */ 557 __u16 port; /* port number for the service */ 558 __u32 fwmark; /* firewall mark of the service */ 559 unsigned flags; /* service status flags */ 560 unsigned timeout; /* persistent timeout in ticks */ 561 __u32 netmask; /* grouping granularity */ 562 563 struct list_head destinations; /* real server d-linked list */ 564 __u32 num_dests; /* number of servers */ 565 struct ip_vs_stats stats; /* statistics for the service */ 566 struct ip_vs_app *inc; /* bind conns to this app inc */ 567 568 /* for scheduling */ 569 struct ip_vs_scheduler *scheduler; /* bound scheduler object */ 570 rwlock_t sched_lock; /* lock sched_data */ 571 void *sched_data; /* scheduler application data */ 572 }; 573 574 575 /* 576 * The real server destination forwarding entry 577 * with ip address, port number, and so on. 578 */ 579 struct ip_vs_dest { 580 struct list_head n_list; /* for the dests in the service */ 581 struct list_head d_list; /* for table with all the dests */ 582 583 __u32 addr; /* IP address of the server */ 584 __u16 port; /* port number of the server */ 585 volatile unsigned flags; /* dest status flags */ 586 atomic_t conn_flags; /* flags to copy to conn */ 587 atomic_t weight; /* server weight */ 588 589 atomic_t refcnt; /* reference counter */ 590 struct ip_vs_stats stats; /* statistics */ 591 592 /* connection counters and thresholds */ 593 atomic_t activeconns; /* active connections */ 594 atomic_t inactconns; /* inactive connections */ 595 atomic_t persistconns; /* persistent connections */ 596 __u32 u_threshold; /* upper threshold */ 597 __u32 l_threshold; /* lower threshold */ 598 599 /* for destination cache */ 600 spinlock_t dst_lock; /* lock of dst_cache */ 601 struct dst_entry *dst_cache; /* destination cache entry */ 602 u32 dst_rtos; /* RT_TOS(tos) for dst */ 603 604 /* for virtual service */ 605 struct ip_vs_service *svc; /* service it belongs to */ 606 __u16 protocol; /* which protocol (TCP/UDP) */ 607 __u32 vaddr; /* virtual IP address */ 608 __u16 vport; /* virtual port number */ 609 __u32 vfwmark; /* firewall mark of service */ 610 }; 611 612 613 /* 614 * The scheduler object 615 */ 616 struct ip_vs_scheduler { 617 struct list_head n_list; /* d-linked list head */ 618 char *name; /* scheduler name */ 619 atomic_t refcnt; /* reference counter */ 620 struct module *module; /* THIS_MODULE/NULL */ 621 622 /* scheduler initializing service */ 623 int (*init_service)(struct ip_vs_service *svc); 624 /* scheduling service finish */ 625 int (*done_service)(struct ip_vs_service *svc); 626 /* scheduler updating service */ 627 int (*update_service)(struct ip_vs_service *svc); 628 629 /* selecting a server from the given service */ 630 struct ip_vs_dest* (*schedule)(struct ip_vs_service *svc, 631 const struct sk_buff *skb); 632 }; 633 634 635 /* 636 * The application module object (a.k.a. app incarnation) 637 */ 638 struct ip_vs_app 639 { 640 struct list_head a_list; /* member in app list */ 641 int type; /* IP_VS_APP_TYPE_xxx */ 642 char *name; /* application module name */ 643 __u16 protocol; 644 struct module *module; /* THIS_MODULE/NULL */ 645 struct list_head incs_list; /* list of incarnations */ 646 647 /* members for application incarnations */ 648 struct list_head p_list; /* member in proto app list */ 649 struct ip_vs_app *app; /* its real application */ 650 __u16 port; /* port number in net order */ 651 atomic_t usecnt; /* usage counter */ 652 653 /* output hook: return false if can't linearize. diff set for TCP. */ 654 int (*pkt_out)(struct ip_vs_app *, struct ip_vs_conn *, 655 struct sk_buff **, int *diff); 656 657 /* input hook: return false if can't linearize. diff set for TCP. */ 658 int (*pkt_in)(struct ip_vs_app *, struct ip_vs_conn *, 659 struct sk_buff **, int *diff); 660 661 /* ip_vs_app initializer */ 662 int (*init_conn)(struct ip_vs_app *, struct ip_vs_conn *); 663 664 /* ip_vs_app finish */ 665 int (*done_conn)(struct ip_vs_app *, struct ip_vs_conn *); 666 667 668 /* not used now */ 669 int (*bind_conn)(struct ip_vs_app *, struct ip_vs_conn *, 670 struct ip_vs_protocol *); 671 672 void (*unbind_conn)(struct ip_vs_app *, struct ip_vs_conn *); 673 674 int * timeout_table; 675 int * timeouts; 676 int timeouts_size; 677 678 int (*conn_schedule)(struct sk_buff *skb, struct ip_vs_app *app, 679 int *verdict, struct ip_vs_conn **cpp); 680 681 struct ip_vs_conn * 682 (*conn_in_get)(const struct sk_buff *skb, struct ip_vs_app *app, 683 const struct iphdr *iph, unsigned int proto_off, 684 int inverse); 685 686 struct ip_vs_conn * 687 (*conn_out_get)(const struct sk_buff *skb, struct ip_vs_app *app, 688 const struct iphdr *iph, unsigned int proto_off, 689 int inverse); 690 691 int (*state_transition)(struct ip_vs_conn *cp, int direction, 692 const struct sk_buff *skb, 693 struct ip_vs_app *app); 694 695 void (*timeout_change)(struct ip_vs_app *app, int flags); 696 }; 697 698 699 /* 700 * IPVS core functions 701 * (from ip_vs_core.c) 702 */ 703 extern const char *ip_vs_proto_name(unsigned proto); 704 extern void ip_vs_init_hash_table(struct list_head *table, int rows); 705 #define IP_VS_INIT_HASH_TABLE(t) ip_vs_init_hash_table(t, sizeof(t)/sizeof(t[0])) 706 707 #define IP_VS_APP_TYPE_UNSPEC 0 708 #define IP_VS_APP_TYPE_FTP 1 709 710 /* 711 * ip_vs_conn handling functions 712 * (from ip_vs_conn.c) 713 */ 714 715 /* 716 * IPVS connection entry hash table 717 */ 718 #ifndef CONFIG_IP_VS_TAB_BITS 719 #define CONFIG_IP_VS_TAB_BITS 12 720 #endif 721 /* make sure that IP_VS_CONN_TAB_BITS is located in [8, 20] */ 722 #if CONFIG_IP_VS_TAB_BITS < 8 723 #define IP_VS_CONN_TAB_BITS 8 724 #endif 725 #if CONFIG_IP_VS_TAB_BITS > 20 726 #define IP_VS_CONN_TAB_BITS 20 727 #endif 728 #if 8 <= CONFIG_IP_VS_TAB_BITS && CONFIG_IP_VS_TAB_BITS <= 20 729 #define IP_VS_CONN_TAB_BITS CONFIG_IP_VS_TAB_BITS 730 #endif 731 #define IP_VS_CONN_TAB_SIZE (1 << IP_VS_CONN_TAB_BITS) 732 #define IP_VS_CONN_TAB_MASK (IP_VS_CONN_TAB_SIZE - 1) 733 734 enum { 735 IP_VS_DIR_INPUT = 0, 736 IP_VS_DIR_OUTPUT, 737 IP_VS_DIR_INPUT_ONLY, 738 IP_VS_DIR_LAST, 739 }; 740 741 extern struct ip_vs_conn *ip_vs_conn_in_get 742 (int protocol, __u32 s_addr, __u16 s_port, __u32 d_addr, __u16 d_port); 743 extern struct ip_vs_conn *ip_vs_conn_out_get 744 (int protocol, __u32 s_addr, __u16 s_port, __u32 d_addr, __u16 d_port); 745 746 /* put back the conn without restarting its timer */ 747 static inline void __ip_vs_conn_put(struct ip_vs_conn *cp) 748 { 749 atomic_dec(&cp->refcnt); 750 } 751 extern void ip_vs_conn_put(struct ip_vs_conn *cp); 752 extern void ip_vs_conn_fill_cport(struct ip_vs_conn *cp, __u16 cport); 753 754 extern struct ip_vs_conn * 755 ip_vs_conn_new(int proto, __u32 caddr, __u16 cport, __u32 vaddr, __u16 vport, 756 __u32 daddr, __u16 dport, unsigned flags, 757 struct ip_vs_dest *dest); 758 extern void ip_vs_conn_expire_now(struct ip_vs_conn *cp); 759 760 extern const char * ip_vs_state_name(__u16 proto, int state); 761 762 extern void ip_vs_tcp_conn_listen(struct ip_vs_conn *cp); 763 extern int ip_vs_check_template(struct ip_vs_conn *ct); 764 extern void ip_vs_secure_tcp_set(int on); 765 extern void ip_vs_random_dropentry(void); 766 extern int ip_vs_conn_init(void); 767 extern void ip_vs_conn_cleanup(void); 768 769 static inline void ip_vs_control_del(struct ip_vs_conn *cp) 770 { 771 struct ip_vs_conn *ctl_cp = cp->control; 772 if (!ctl_cp) { 773 IP_VS_ERR("request control DEL for uncontrolled: " 774 "%d.%d.%d.%d:%d to %d.%d.%d.%d:%d\n", 775 NIPQUAD(cp->caddr),ntohs(cp->cport), 776 NIPQUAD(cp->vaddr),ntohs(cp->vport)); 777 return; 778 } 779 780 IP_VS_DBG(7, "DELeting control for: " 781 "cp.dst=%d.%d.%d.%d:%d ctl_cp.dst=%d.%d.%d.%d:%d\n", 782 NIPQUAD(cp->caddr),ntohs(cp->cport), 783 NIPQUAD(ctl_cp->caddr),ntohs(ctl_cp->cport)); 784 785 cp->control = NULL; 786 if (atomic_read(&ctl_cp->n_control) == 0) { 787 IP_VS_ERR("BUG control DEL with n=0 : " 788 "%d.%d.%d.%d:%d to %d.%d.%d.%d:%d\n", 789 NIPQUAD(cp->caddr),ntohs(cp->cport), 790 NIPQUAD(cp->vaddr),ntohs(cp->vport)); 791 return; 792 } 793 atomic_dec(&ctl_cp->n_control); 794 } 795 796 static inline void 797 ip_vs_control_add(struct ip_vs_conn *cp, struct ip_vs_conn *ctl_cp) 798 { 799 if (cp->control) { 800 IP_VS_ERR("request control ADD for already controlled: " 801 "%d.%d.%d.%d:%d to %d.%d.%d.%d:%d\n", 802 NIPQUAD(cp->caddr),ntohs(cp->cport), 803 NIPQUAD(cp->vaddr),ntohs(cp->vport)); 804 ip_vs_control_del(cp); 805 } 806 807 IP_VS_DBG(7, "ADDing control for: " 808 "cp.dst=%d.%d.%d.%d:%d ctl_cp.dst=%d.%d.%d.%d:%d\n", 809 NIPQUAD(cp->caddr),ntohs(cp->cport), 810 NIPQUAD(ctl_cp->caddr),ntohs(ctl_cp->cport)); 811 812 cp->control = ctl_cp; 813 atomic_inc(&ctl_cp->n_control); 814 } 815 816 817 /* 818 * IPVS application functions 819 * (from ip_vs_app.c) 820 */ 821 #define IP_VS_APP_MAX_PORTS 8 822 extern int register_ip_vs_app(struct ip_vs_app *app); 823 extern void unregister_ip_vs_app(struct ip_vs_app *app); 824 extern int ip_vs_bind_app(struct ip_vs_conn *cp, struct ip_vs_protocol *pp); 825 extern void ip_vs_unbind_app(struct ip_vs_conn *cp); 826 extern int 827 register_ip_vs_app_inc(struct ip_vs_app *app, __u16 proto, __u16 port); 828 extern int ip_vs_app_inc_get(struct ip_vs_app *inc); 829 extern void ip_vs_app_inc_put(struct ip_vs_app *inc); 830 831 extern int ip_vs_app_pkt_out(struct ip_vs_conn *, struct sk_buff **pskb); 832 extern int ip_vs_app_pkt_in(struct ip_vs_conn *, struct sk_buff **pskb); 833 extern int ip_vs_skb_replace(struct sk_buff *skb, int pri, 834 char *o_buf, int o_len, char *n_buf, int n_len); 835 extern int ip_vs_app_init(void); 836 extern void ip_vs_app_cleanup(void); 837 838 839 /* 840 * IPVS protocol functions (from ip_vs_proto.c) 841 */ 842 extern int ip_vs_protocol_init(void); 843 extern void ip_vs_protocol_cleanup(void); 844 extern void ip_vs_protocol_timeout_change(int flags); 845 extern int *ip_vs_create_timeout_table(int *table, int size); 846 extern int 847 ip_vs_set_state_timeout(int *table, int num, char **names, char *name, int to); 848 extern void 849 ip_vs_tcpudp_debug_packet(struct ip_vs_protocol *pp, const struct sk_buff *skb, 850 int offset, const char *msg); 851 852 extern struct ip_vs_protocol ip_vs_protocol_tcp; 853 extern struct ip_vs_protocol ip_vs_protocol_udp; 854 extern struct ip_vs_protocol ip_vs_protocol_icmp; 855 extern struct ip_vs_protocol ip_vs_protocol_esp; 856 extern struct ip_vs_protocol ip_vs_protocol_ah; 857 858 859 /* 860 * Registering/unregistering scheduler functions 861 * (from ip_vs_sched.c) 862 */ 863 extern int register_ip_vs_scheduler(struct ip_vs_scheduler *scheduler); 864 extern int unregister_ip_vs_scheduler(struct ip_vs_scheduler *scheduler); 865 extern int ip_vs_bind_scheduler(struct ip_vs_service *svc, 866 struct ip_vs_scheduler *scheduler); 867 extern int ip_vs_unbind_scheduler(struct ip_vs_service *svc); 868 extern struct ip_vs_scheduler *ip_vs_scheduler_get(const char *sched_name); 869 extern void ip_vs_scheduler_put(struct ip_vs_scheduler *scheduler); 870 extern struct ip_vs_conn * 871 ip_vs_schedule(struct ip_vs_service *svc, const struct sk_buff *skb); 872 extern int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb, 873 struct ip_vs_protocol *pp); 874 875 876 /* 877 * IPVS control data and functions (from ip_vs_ctl.c) 878 */ 879 extern int sysctl_ip_vs_cache_bypass; 880 extern int sysctl_ip_vs_expire_nodest_conn; 881 extern int sysctl_ip_vs_expire_quiescent_template; 882 extern int sysctl_ip_vs_sync_threshold[2]; 883 extern int sysctl_ip_vs_nat_icmp_send; 884 extern struct ip_vs_stats ip_vs_stats; 885 886 extern struct ip_vs_service * 887 ip_vs_service_get(__u32 fwmark, __u16 protocol, __u32 vaddr, __u16 vport); 888 889 static inline void ip_vs_service_put(struct ip_vs_service *svc) 890 { 891 atomic_dec(&svc->usecnt); 892 } 893 894 extern struct ip_vs_dest * 895 ip_vs_lookup_real_service(__u16 protocol, __u32 daddr, __u16 dport); 896 extern int ip_vs_use_count_inc(void); 897 extern void ip_vs_use_count_dec(void); 898 extern int ip_vs_control_init(void); 899 extern void ip_vs_control_cleanup(void); 900 901 902 /* 903 * IPVS sync daemon data and function prototypes 904 * (from ip_vs_sync.c) 905 */ 906 extern volatile int ip_vs_sync_state; 907 extern volatile int ip_vs_master_syncid; 908 extern volatile int ip_vs_backup_syncid; 909 extern char ip_vs_master_mcast_ifn[IP_VS_IFNAME_MAXLEN]; 910 extern char ip_vs_backup_mcast_ifn[IP_VS_IFNAME_MAXLEN]; 911 extern int start_sync_thread(int state, char *mcast_ifn, __u8 syncid); 912 extern int stop_sync_thread(int state); 913 extern void ip_vs_sync_conn(struct ip_vs_conn *cp); 914 915 916 /* 917 * IPVS rate estimator prototypes (from ip_vs_est.c) 918 */ 919 extern int ip_vs_new_estimator(struct ip_vs_stats *stats); 920 extern void ip_vs_kill_estimator(struct ip_vs_stats *stats); 921 extern void ip_vs_zero_estimator(struct ip_vs_stats *stats); 922 923 /* 924 * Various IPVS packet transmitters (from ip_vs_xmit.c) 925 */ 926 extern int ip_vs_null_xmit 927 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp); 928 extern int ip_vs_bypass_xmit 929 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp); 930 extern int ip_vs_nat_xmit 931 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp); 932 extern int ip_vs_tunnel_xmit 933 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp); 934 extern int ip_vs_dr_xmit 935 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp); 936 extern int ip_vs_icmp_xmit 937 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp, int offset); 938 extern void ip_vs_dst_reset(struct ip_vs_dest *dest); 939 940 941 /* 942 * This is a simple mechanism to ignore packets when 943 * we are loaded. Just set ip_vs_drop_rate to 'n' and 944 * we start to drop 1/rate of the packets 945 */ 946 extern int ip_vs_drop_rate; 947 extern int ip_vs_drop_counter; 948 949 static __inline__ int ip_vs_todrop(void) 950 { 951 if (!ip_vs_drop_rate) return 0; 952 if (--ip_vs_drop_counter > 0) return 0; 953 ip_vs_drop_counter = ip_vs_drop_rate; 954 return 1; 955 } 956 957 /* 958 * ip_vs_fwd_tag returns the forwarding tag of the connection 959 */ 960 #define IP_VS_FWD_METHOD(cp) (cp->flags & IP_VS_CONN_F_FWD_MASK) 961 962 extern __inline__ char ip_vs_fwd_tag(struct ip_vs_conn *cp) 963 { 964 char fwd; 965 966 switch (IP_VS_FWD_METHOD(cp)) { 967 case IP_VS_CONN_F_MASQ: 968 fwd = 'M'; break; 969 case IP_VS_CONN_F_LOCALNODE: 970 fwd = 'L'; break; 971 case IP_VS_CONN_F_TUNNEL: 972 fwd = 'T'; break; 973 case IP_VS_CONN_F_DROUTE: 974 fwd = 'R'; break; 975 case IP_VS_CONN_F_BYPASS: 976 fwd = 'B'; break; 977 default: 978 fwd = '?'; break; 979 } 980 return fwd; 981 } 982 983 extern int ip_vs_make_skb_writable(struct sk_buff **pskb, int len); 984 extern void ip_vs_nat_icmp(struct sk_buff *skb, struct ip_vs_protocol *pp, 985 struct ip_vs_conn *cp, int dir); 986 987 extern u16 ip_vs_checksum_complete(struct sk_buff *skb, int offset); 988 989 static inline u16 ip_vs_check_diff(u32 old, u32 new, u16 oldsum) 990 { 991 u32 diff[2] = { old, new }; 992 993 return csum_fold(csum_partial((char *) diff, sizeof(diff), 994 oldsum ^ 0xFFFF)); 995 } 996 997 #endif /* __KERNEL__ */ 998 999 #endif /* _IP_VS_H */ 1000