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/udp.h> 259 #include <linux/compiler.h> 260 261 262 #ifdef CONFIG_IP_VS_DEBUG 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 ip_vs_conn; 432 struct ip_vs_app; 433 434 struct ip_vs_protocol { 435 struct ip_vs_protocol *next; 436 char *name; 437 __u16 protocol; 438 int dont_defrag; 439 atomic_t appcnt; /* counter of proto app incs */ 440 int *timeout_table; /* protocol timeout table */ 441 442 void (*init)(struct ip_vs_protocol *pp); 443 444 void (*exit)(struct ip_vs_protocol *pp); 445 446 int (*conn_schedule)(struct sk_buff *skb, 447 struct ip_vs_protocol *pp, 448 int *verdict, struct ip_vs_conn **cpp); 449 450 struct ip_vs_conn * 451 (*conn_in_get)(const struct sk_buff *skb, 452 struct ip_vs_protocol *pp, 453 const struct iphdr *iph, 454 unsigned int proto_off, 455 int inverse); 456 457 struct ip_vs_conn * 458 (*conn_out_get)(const struct sk_buff *skb, 459 struct ip_vs_protocol *pp, 460 const struct iphdr *iph, 461 unsigned int proto_off, 462 int inverse); 463 464 int (*snat_handler)(struct sk_buff **pskb, 465 struct ip_vs_protocol *pp, struct ip_vs_conn *cp); 466 467 int (*dnat_handler)(struct sk_buff **pskb, 468 struct ip_vs_protocol *pp, struct ip_vs_conn *cp); 469 470 int (*csum_check)(struct sk_buff *skb, struct ip_vs_protocol *pp); 471 472 const char *(*state_name)(int state); 473 474 int (*state_transition)(struct ip_vs_conn *cp, int direction, 475 const struct sk_buff *skb, 476 struct ip_vs_protocol *pp); 477 478 int (*register_app)(struct ip_vs_app *inc); 479 480 void (*unregister_app)(struct ip_vs_app *inc); 481 482 int (*app_conn_bind)(struct ip_vs_conn *cp); 483 484 void (*debug_packet)(struct ip_vs_protocol *pp, 485 const struct sk_buff *skb, 486 int offset, 487 const char *msg); 488 489 void (*timeout_change)(struct ip_vs_protocol *pp, int flags); 490 491 int (*set_state_timeout)(struct ip_vs_protocol *pp, char *sname, int to); 492 }; 493 494 extern struct ip_vs_protocol * ip_vs_proto_get(unsigned short proto); 495 496 /* 497 * IP_VS structure allocated for each dynamically scheduled connection 498 */ 499 struct ip_vs_conn { 500 struct list_head c_list; /* hashed list heads */ 501 502 /* Protocol, addresses and port numbers */ 503 __u32 caddr; /* client address */ 504 __u32 vaddr; /* virtual address */ 505 __u32 daddr; /* destination address */ 506 __u16 cport; 507 __u16 vport; 508 __u16 dport; 509 __u16 protocol; /* Which protocol (TCP/UDP) */ 510 511 /* counter and timer */ 512 atomic_t refcnt; /* reference count */ 513 struct timer_list timer; /* Expiration timer */ 514 volatile unsigned long timeout; /* timeout */ 515 516 /* Flags and state transition */ 517 spinlock_t lock; /* lock for state transition */ 518 volatile __u16 flags; /* status flags */ 519 volatile __u16 state; /* state info */ 520 521 /* Control members */ 522 struct ip_vs_conn *control; /* Master control connection */ 523 atomic_t n_control; /* Number of controlled ones */ 524 struct ip_vs_dest *dest; /* real server */ 525 atomic_t in_pkts; /* incoming packet counter */ 526 527 /* packet transmitter for different forwarding methods. If it 528 mangles the packet, it must return NF_DROP or better NF_STOLEN, 529 otherwise this must be changed to a sk_buff **. 530 */ 531 int (*packet_xmit)(struct sk_buff *skb, struct ip_vs_conn *cp, 532 struct ip_vs_protocol *pp); 533 534 /* Note: we can group the following members into a structure, 535 in order to save more space, and the following members are 536 only used in VS/NAT anyway */ 537 struct ip_vs_app *app; /* bound ip_vs_app object */ 538 void *app_data; /* Application private data */ 539 struct ip_vs_seq in_seq; /* incoming seq. struct */ 540 struct ip_vs_seq out_seq; /* outgoing seq. struct */ 541 }; 542 543 544 /* 545 * The information about the virtual service offered to the net 546 * and the forwarding entries 547 */ 548 struct ip_vs_service { 549 struct list_head s_list; /* for normal service table */ 550 struct list_head f_list; /* for fwmark-based service table */ 551 atomic_t refcnt; /* reference counter */ 552 atomic_t usecnt; /* use counter */ 553 554 __u16 protocol; /* which protocol (TCP/UDP) */ 555 __u32 addr; /* IP address for virtual service */ 556 __u16 port; /* port number for the service */ 557 __u32 fwmark; /* firewall mark of the service */ 558 unsigned flags; /* service status flags */ 559 unsigned timeout; /* persistent timeout in ticks */ 560 __u32 netmask; /* grouping granularity */ 561 562 struct list_head destinations; /* real server d-linked list */ 563 __u32 num_dests; /* number of servers */ 564 struct ip_vs_stats stats; /* statistics for the service */ 565 struct ip_vs_app *inc; /* bind conns to this app inc */ 566 567 /* for scheduling */ 568 struct ip_vs_scheduler *scheduler; /* bound scheduler object */ 569 rwlock_t sched_lock; /* lock sched_data */ 570 void *sched_data; /* scheduler application data */ 571 }; 572 573 574 /* 575 * The real server destination forwarding entry 576 * with ip address, port number, and so on. 577 */ 578 struct ip_vs_dest { 579 struct list_head n_list; /* for the dests in the service */ 580 struct list_head d_list; /* for table with all the dests */ 581 582 __u32 addr; /* IP address of the server */ 583 __u16 port; /* port number of the server */ 584 volatile unsigned flags; /* dest status flags */ 585 atomic_t conn_flags; /* flags to copy to conn */ 586 atomic_t weight; /* server weight */ 587 588 atomic_t refcnt; /* reference counter */ 589 struct ip_vs_stats stats; /* statistics */ 590 591 /* connection counters and thresholds */ 592 atomic_t activeconns; /* active connections */ 593 atomic_t inactconns; /* inactive connections */ 594 atomic_t persistconns; /* persistent connections */ 595 __u32 u_threshold; /* upper threshold */ 596 __u32 l_threshold; /* lower threshold */ 597 598 /* for destination cache */ 599 spinlock_t dst_lock; /* lock of dst_cache */ 600 struct dst_entry *dst_cache; /* destination cache entry */ 601 u32 dst_rtos; /* RT_TOS(tos) for dst */ 602 603 /* for virtual service */ 604 struct ip_vs_service *svc; /* service it belongs to */ 605 __u16 protocol; /* which protocol (TCP/UDP) */ 606 __u32 vaddr; /* virtual IP address */ 607 __u16 vport; /* virtual port number */ 608 __u32 vfwmark; /* firewall mark of service */ 609 }; 610 611 612 /* 613 * The scheduler object 614 */ 615 struct ip_vs_scheduler { 616 struct list_head n_list; /* d-linked list head */ 617 char *name; /* scheduler name */ 618 atomic_t refcnt; /* reference counter */ 619 struct module *module; /* THIS_MODULE/NULL */ 620 621 /* scheduler initializing service */ 622 int (*init_service)(struct ip_vs_service *svc); 623 /* scheduling service finish */ 624 int (*done_service)(struct ip_vs_service *svc); 625 /* scheduler updating service */ 626 int (*update_service)(struct ip_vs_service *svc); 627 628 /* selecting a server from the given service */ 629 struct ip_vs_dest* (*schedule)(struct ip_vs_service *svc, 630 const struct sk_buff *skb); 631 }; 632 633 634 /* 635 * The application module object (a.k.a. app incarnation) 636 */ 637 struct ip_vs_app 638 { 639 struct list_head a_list; /* member in app list */ 640 int type; /* IP_VS_APP_TYPE_xxx */ 641 char *name; /* application module name */ 642 __u16 protocol; 643 struct module *module; /* THIS_MODULE/NULL */ 644 struct list_head incs_list; /* list of incarnations */ 645 646 /* members for application incarnations */ 647 struct list_head p_list; /* member in proto app list */ 648 struct ip_vs_app *app; /* its real application */ 649 __u16 port; /* port number in net order */ 650 atomic_t usecnt; /* usage counter */ 651 652 /* output hook: return false if can't linearize. diff set for TCP. */ 653 int (*pkt_out)(struct ip_vs_app *, struct ip_vs_conn *, 654 struct sk_buff **, int *diff); 655 656 /* input hook: return false if can't linearize. diff set for TCP. */ 657 int (*pkt_in)(struct ip_vs_app *, struct ip_vs_conn *, 658 struct sk_buff **, int *diff); 659 660 /* ip_vs_app initializer */ 661 int (*init_conn)(struct ip_vs_app *, struct ip_vs_conn *); 662 663 /* ip_vs_app finish */ 664 int (*done_conn)(struct ip_vs_app *, struct ip_vs_conn *); 665 666 667 /* not used now */ 668 int (*bind_conn)(struct ip_vs_app *, struct ip_vs_conn *, 669 struct ip_vs_protocol *); 670 671 void (*unbind_conn)(struct ip_vs_app *, struct ip_vs_conn *); 672 673 int * timeout_table; 674 int * timeouts; 675 int timeouts_size; 676 677 int (*conn_schedule)(struct sk_buff *skb, struct ip_vs_app *app, 678 int *verdict, struct ip_vs_conn **cpp); 679 680 struct ip_vs_conn * 681 (*conn_in_get)(const struct sk_buff *skb, struct ip_vs_app *app, 682 const struct iphdr *iph, unsigned int proto_off, 683 int inverse); 684 685 struct ip_vs_conn * 686 (*conn_out_get)(const struct sk_buff *skb, struct ip_vs_app *app, 687 const struct iphdr *iph, unsigned int proto_off, 688 int inverse); 689 690 int (*state_transition)(struct ip_vs_conn *cp, int direction, 691 const struct sk_buff *skb, 692 struct ip_vs_app *app); 693 694 void (*timeout_change)(struct ip_vs_app *app, int flags); 695 }; 696 697 698 /* 699 * IPVS core functions 700 * (from ip_vs_core.c) 701 */ 702 extern const char *ip_vs_proto_name(unsigned proto); 703 extern void ip_vs_init_hash_table(struct list_head *table, int rows); 704 #define IP_VS_INIT_HASH_TABLE(t) ip_vs_init_hash_table(t, sizeof(t)/sizeof(t[0])) 705 706 #define IP_VS_APP_TYPE_UNSPEC 0 707 #define IP_VS_APP_TYPE_FTP 1 708 709 /* 710 * ip_vs_conn handling functions 711 * (from ip_vs_conn.c) 712 */ 713 714 /* 715 * IPVS connection entry hash table 716 */ 717 #ifndef CONFIG_IP_VS_TAB_BITS 718 #define CONFIG_IP_VS_TAB_BITS 12 719 #endif 720 /* make sure that IP_VS_CONN_TAB_BITS is located in [8, 20] */ 721 #if CONFIG_IP_VS_TAB_BITS < 8 722 #define IP_VS_CONN_TAB_BITS 8 723 #endif 724 #if CONFIG_IP_VS_TAB_BITS > 20 725 #define IP_VS_CONN_TAB_BITS 20 726 #endif 727 #if 8 <= CONFIG_IP_VS_TAB_BITS && CONFIG_IP_VS_TAB_BITS <= 20 728 #define IP_VS_CONN_TAB_BITS CONFIG_IP_VS_TAB_BITS 729 #endif 730 #define IP_VS_CONN_TAB_SIZE (1 << IP_VS_CONN_TAB_BITS) 731 #define IP_VS_CONN_TAB_MASK (IP_VS_CONN_TAB_SIZE - 1) 732 733 enum { 734 IP_VS_DIR_INPUT = 0, 735 IP_VS_DIR_OUTPUT, 736 IP_VS_DIR_INPUT_ONLY, 737 IP_VS_DIR_LAST, 738 }; 739 740 extern struct ip_vs_conn *ip_vs_conn_in_get 741 (int protocol, __u32 s_addr, __u16 s_port, __u32 d_addr, __u16 d_port); 742 extern struct ip_vs_conn *ip_vs_conn_out_get 743 (int protocol, __u32 s_addr, __u16 s_port, __u32 d_addr, __u16 d_port); 744 745 /* put back the conn without restarting its timer */ 746 static inline void __ip_vs_conn_put(struct ip_vs_conn *cp) 747 { 748 atomic_dec(&cp->refcnt); 749 } 750 extern void ip_vs_conn_put(struct ip_vs_conn *cp); 751 extern void ip_vs_conn_fill_cport(struct ip_vs_conn *cp, __u16 cport); 752 753 extern struct ip_vs_conn * 754 ip_vs_conn_new(int proto, __u32 caddr, __u16 cport, __u32 vaddr, __u16 vport, 755 __u32 daddr, __u16 dport, unsigned flags, 756 struct ip_vs_dest *dest); 757 extern void ip_vs_conn_expire_now(struct ip_vs_conn *cp); 758 759 extern const char * ip_vs_state_name(__u16 proto, int state); 760 761 extern void ip_vs_tcp_conn_listen(struct ip_vs_conn *cp); 762 extern int ip_vs_check_template(struct ip_vs_conn *ct); 763 extern void ip_vs_secure_tcp_set(int on); 764 extern void ip_vs_random_dropentry(void); 765 extern int ip_vs_conn_init(void); 766 extern void ip_vs_conn_cleanup(void); 767 768 static inline void ip_vs_control_del(struct ip_vs_conn *cp) 769 { 770 struct ip_vs_conn *ctl_cp = cp->control; 771 if (!ctl_cp) { 772 IP_VS_ERR("request control DEL for uncontrolled: " 773 "%d.%d.%d.%d:%d to %d.%d.%d.%d:%d\n", 774 NIPQUAD(cp->caddr),ntohs(cp->cport), 775 NIPQUAD(cp->vaddr),ntohs(cp->vport)); 776 return; 777 } 778 779 IP_VS_DBG(7, "DELeting control for: " 780 "cp.dst=%d.%d.%d.%d:%d ctl_cp.dst=%d.%d.%d.%d:%d\n", 781 NIPQUAD(cp->caddr),ntohs(cp->cport), 782 NIPQUAD(ctl_cp->caddr),ntohs(ctl_cp->cport)); 783 784 cp->control = NULL; 785 if (atomic_read(&ctl_cp->n_control) == 0) { 786 IP_VS_ERR("BUG control DEL with n=0 : " 787 "%d.%d.%d.%d:%d to %d.%d.%d.%d:%d\n", 788 NIPQUAD(cp->caddr),ntohs(cp->cport), 789 NIPQUAD(cp->vaddr),ntohs(cp->vport)); 790 return; 791 } 792 atomic_dec(&ctl_cp->n_control); 793 } 794 795 static inline void 796 ip_vs_control_add(struct ip_vs_conn *cp, struct ip_vs_conn *ctl_cp) 797 { 798 if (cp->control) { 799 IP_VS_ERR("request control ADD for already controlled: " 800 "%d.%d.%d.%d:%d to %d.%d.%d.%d:%d\n", 801 NIPQUAD(cp->caddr),ntohs(cp->cport), 802 NIPQUAD(cp->vaddr),ntohs(cp->vport)); 803 ip_vs_control_del(cp); 804 } 805 806 IP_VS_DBG(7, "ADDing control for: " 807 "cp.dst=%d.%d.%d.%d:%d ctl_cp.dst=%d.%d.%d.%d:%d\n", 808 NIPQUAD(cp->caddr),ntohs(cp->cport), 809 NIPQUAD(ctl_cp->caddr),ntohs(ctl_cp->cport)); 810 811 cp->control = ctl_cp; 812 atomic_inc(&ctl_cp->n_control); 813 } 814 815 816 /* 817 * IPVS application functions 818 * (from ip_vs_app.c) 819 */ 820 #define IP_VS_APP_MAX_PORTS 8 821 extern int register_ip_vs_app(struct ip_vs_app *app); 822 extern void unregister_ip_vs_app(struct ip_vs_app *app); 823 extern int ip_vs_bind_app(struct ip_vs_conn *cp, struct ip_vs_protocol *pp); 824 extern void ip_vs_unbind_app(struct ip_vs_conn *cp); 825 extern int 826 register_ip_vs_app_inc(struct ip_vs_app *app, __u16 proto, __u16 port); 827 extern int ip_vs_app_inc_get(struct ip_vs_app *inc); 828 extern void ip_vs_app_inc_put(struct ip_vs_app *inc); 829 830 extern int ip_vs_app_pkt_out(struct ip_vs_conn *, struct sk_buff **pskb); 831 extern int ip_vs_app_pkt_in(struct ip_vs_conn *, struct sk_buff **pskb); 832 extern int ip_vs_skb_replace(struct sk_buff *skb, int pri, 833 char *o_buf, int o_len, char *n_buf, int n_len); 834 extern int ip_vs_app_init(void); 835 extern void ip_vs_app_cleanup(void); 836 837 838 /* 839 * IPVS protocol functions (from ip_vs_proto.c) 840 */ 841 extern int ip_vs_protocol_init(void); 842 extern void ip_vs_protocol_cleanup(void); 843 extern void ip_vs_protocol_timeout_change(int flags); 844 extern int *ip_vs_create_timeout_table(int *table, int size); 845 extern int 846 ip_vs_set_state_timeout(int *table, int num, char **names, char *name, int to); 847 extern void 848 ip_vs_tcpudp_debug_packet(struct ip_vs_protocol *pp, const struct sk_buff *skb, 849 int offset, const char *msg); 850 851 extern struct ip_vs_protocol ip_vs_protocol_tcp; 852 extern struct ip_vs_protocol ip_vs_protocol_udp; 853 extern struct ip_vs_protocol ip_vs_protocol_icmp; 854 extern struct ip_vs_protocol ip_vs_protocol_esp; 855 extern struct ip_vs_protocol ip_vs_protocol_ah; 856 857 858 /* 859 * Registering/unregistering scheduler functions 860 * (from ip_vs_sched.c) 861 */ 862 extern int register_ip_vs_scheduler(struct ip_vs_scheduler *scheduler); 863 extern int unregister_ip_vs_scheduler(struct ip_vs_scheduler *scheduler); 864 extern int ip_vs_bind_scheduler(struct ip_vs_service *svc, 865 struct ip_vs_scheduler *scheduler); 866 extern int ip_vs_unbind_scheduler(struct ip_vs_service *svc); 867 extern struct ip_vs_scheduler *ip_vs_scheduler_get(const char *sched_name); 868 extern void ip_vs_scheduler_put(struct ip_vs_scheduler *scheduler); 869 extern struct ip_vs_conn * 870 ip_vs_schedule(struct ip_vs_service *svc, const struct sk_buff *skb); 871 extern int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb, 872 struct ip_vs_protocol *pp); 873 874 875 /* 876 * IPVS control data and functions (from ip_vs_ctl.c) 877 */ 878 extern int sysctl_ip_vs_cache_bypass; 879 extern int sysctl_ip_vs_expire_nodest_conn; 880 extern int sysctl_ip_vs_expire_quiescent_template; 881 extern int sysctl_ip_vs_sync_threshold[2]; 882 extern int sysctl_ip_vs_nat_icmp_send; 883 extern struct ip_vs_stats ip_vs_stats; 884 885 extern struct ip_vs_service * 886 ip_vs_service_get(__u32 fwmark, __u16 protocol, __u32 vaddr, __u16 vport); 887 888 static inline void ip_vs_service_put(struct ip_vs_service *svc) 889 { 890 atomic_dec(&svc->usecnt); 891 } 892 893 extern struct ip_vs_dest * 894 ip_vs_lookup_real_service(__u16 protocol, __u32 daddr, __u16 dport); 895 extern int ip_vs_use_count_inc(void); 896 extern void ip_vs_use_count_dec(void); 897 extern int ip_vs_control_init(void); 898 extern void ip_vs_control_cleanup(void); 899 900 901 /* 902 * IPVS sync daemon data and function prototypes 903 * (from ip_vs_sync.c) 904 */ 905 extern volatile int ip_vs_sync_state; 906 extern volatile int ip_vs_master_syncid; 907 extern volatile int ip_vs_backup_syncid; 908 extern char ip_vs_master_mcast_ifn[IP_VS_IFNAME_MAXLEN]; 909 extern char ip_vs_backup_mcast_ifn[IP_VS_IFNAME_MAXLEN]; 910 extern int start_sync_thread(int state, char *mcast_ifn, __u8 syncid); 911 extern int stop_sync_thread(int state); 912 extern void ip_vs_sync_conn(struct ip_vs_conn *cp); 913 914 915 /* 916 * IPVS rate estimator prototypes (from ip_vs_est.c) 917 */ 918 extern int ip_vs_new_estimator(struct ip_vs_stats *stats); 919 extern void ip_vs_kill_estimator(struct ip_vs_stats *stats); 920 extern void ip_vs_zero_estimator(struct ip_vs_stats *stats); 921 922 /* 923 * Various IPVS packet transmitters (from ip_vs_xmit.c) 924 */ 925 extern int ip_vs_null_xmit 926 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp); 927 extern int ip_vs_bypass_xmit 928 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp); 929 extern int ip_vs_nat_xmit 930 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp); 931 extern int ip_vs_tunnel_xmit 932 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp); 933 extern int ip_vs_dr_xmit 934 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp); 935 extern int ip_vs_icmp_xmit 936 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp, int offset); 937 extern void ip_vs_dst_reset(struct ip_vs_dest *dest); 938 939 940 /* 941 * This is a simple mechanism to ignore packets when 942 * we are loaded. Just set ip_vs_drop_rate to 'n' and 943 * we start to drop 1/rate of the packets 944 */ 945 extern int ip_vs_drop_rate; 946 extern int ip_vs_drop_counter; 947 948 static __inline__ int ip_vs_todrop(void) 949 { 950 if (!ip_vs_drop_rate) return 0; 951 if (--ip_vs_drop_counter > 0) return 0; 952 ip_vs_drop_counter = ip_vs_drop_rate; 953 return 1; 954 } 955 956 /* 957 * ip_vs_fwd_tag returns the forwarding tag of the connection 958 */ 959 #define IP_VS_FWD_METHOD(cp) (cp->flags & IP_VS_CONN_F_FWD_MASK) 960 961 extern __inline__ char ip_vs_fwd_tag(struct ip_vs_conn *cp) 962 { 963 char fwd; 964 965 switch (IP_VS_FWD_METHOD(cp)) { 966 case IP_VS_CONN_F_MASQ: 967 fwd = 'M'; break; 968 case IP_VS_CONN_F_LOCALNODE: 969 fwd = 'L'; break; 970 case IP_VS_CONN_F_TUNNEL: 971 fwd = 'T'; break; 972 case IP_VS_CONN_F_DROUTE: 973 fwd = 'R'; break; 974 case IP_VS_CONN_F_BYPASS: 975 fwd = 'B'; break; 976 default: 977 fwd = '?'; break; 978 } 979 return fwd; 980 } 981 982 extern int ip_vs_make_skb_writable(struct sk_buff **pskb, int len); 983 extern void ip_vs_nat_icmp(struct sk_buff *skb, struct ip_vs_protocol *pp, 984 struct ip_vs_conn *cp, int dir); 985 986 extern u16 ip_vs_checksum_complete(struct sk_buff *skb, int offset); 987 988 static inline u16 ip_vs_check_diff(u32 old, u32 new, u16 oldsum) 989 { 990 u32 diff[2] = { old, new }; 991 992 return csum_fold(csum_partial((char *) diff, sizeof(diff), 993 oldsum ^ 0xFFFF)); 994 } 995 996 #endif /* __KERNEL__ */ 997 998 #endif /* _IP_VS_H */ 999