1 /* 2 * IP Virtual Server 3 * data structure and functionality definitions 4 */ 5 6 #ifndef _NET_IP_VS_H 7 #define _NET_IP_VS_H 8 9 #include <linux/ip_vs.h> /* definitions shared with userland */ 10 11 /* old ipvsadm versions still include this file directly */ 12 #ifdef __KERNEL__ 13 14 #include <asm/types.h> /* for __uXX types */ 15 16 #include <linux/sysctl.h> /* for ctl_path */ 17 #include <linux/list.h> /* for struct list_head */ 18 #include <linux/spinlock.h> /* for struct rwlock_t */ 19 #include <asm/atomic.h> /* for struct atomic_t */ 20 #include <linux/compiler.h> 21 #include <linux/timer.h> 22 23 #include <net/checksum.h> 24 #include <linux/netfilter.h> /* for union nf_inet_addr */ 25 #include <linux/ip.h> 26 #include <linux/ipv6.h> /* for struct ipv6hdr */ 27 #include <net/ipv6.h> /* for ipv6_addr_copy */ 28 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) 29 #include <net/netfilter/nf_conntrack.h> 30 #endif 31 #include <net/net_namespace.h> /* Netw namespace */ 32 33 /* 34 * Generic access of ipvs struct 35 */ 36 static inline struct netns_ipvs *net_ipvs(struct net* net) 37 { 38 return net->ipvs; 39 } 40 /* 41 * Get net ptr from skb in traffic cases 42 * use skb_sknet when call is from userland (ioctl or netlink) 43 */ 44 static inline struct net *skb_net(const struct sk_buff *skb) 45 { 46 #ifdef CONFIG_NET_NS 47 #ifdef CONFIG_IP_VS_DEBUG 48 /* 49 * This is used for debug only. 50 * Start with the most likely hit 51 * End with BUG 52 */ 53 if (likely(skb->dev && skb->dev->nd_net)) 54 return dev_net(skb->dev); 55 if (skb_dst(skb) && skb_dst(skb)->dev) 56 return dev_net(skb_dst(skb)->dev); 57 WARN(skb->sk, "Maybe skb_sknet should be used in %s() at line:%d\n", 58 __func__, __LINE__); 59 if (likely(skb->sk && skb->sk->sk_net)) 60 return sock_net(skb->sk); 61 pr_err("There is no net ptr to find in the skb in %s() line:%d\n", 62 __func__, __LINE__); 63 BUG(); 64 #else 65 return dev_net(skb->dev ? : skb_dst(skb)->dev); 66 #endif 67 #else 68 return &init_net; 69 #endif 70 } 71 72 static inline struct net *skb_sknet(const struct sk_buff *skb) 73 { 74 #ifdef CONFIG_NET_NS 75 #ifdef CONFIG_IP_VS_DEBUG 76 /* Start with the most likely hit */ 77 if (likely(skb->sk && skb->sk->sk_net)) 78 return sock_net(skb->sk); 79 WARN(skb->dev, "Maybe skb_net should be used instead in %s() line:%d\n", 80 __func__, __LINE__); 81 if (likely(skb->dev && skb->dev->nd_net)) 82 return dev_net(skb->dev); 83 pr_err("There is no net ptr to find in the skb in %s() line:%d\n", 84 __func__, __LINE__); 85 BUG(); 86 #else 87 return sock_net(skb->sk); 88 #endif 89 #else 90 return &init_net; 91 #endif 92 } 93 /* 94 * This one needed for single_open_net since net is stored directly in 95 * private not as a struct i.e. seq_file_net can't be used. 96 */ 97 static inline struct net *seq_file_single_net(struct seq_file *seq) 98 { 99 #ifdef CONFIG_NET_NS 100 return (struct net *)seq->private; 101 #else 102 return &init_net; 103 #endif 104 } 105 106 /* Connections' size value needed by ip_vs_ctl.c */ 107 extern int ip_vs_conn_tab_size; 108 109 110 struct ip_vs_iphdr { 111 int len; 112 __u8 protocol; 113 union nf_inet_addr saddr; 114 union nf_inet_addr daddr; 115 }; 116 117 static inline void 118 ip_vs_fill_iphdr(int af, const void *nh, struct ip_vs_iphdr *iphdr) 119 { 120 #ifdef CONFIG_IP_VS_IPV6 121 if (af == AF_INET6) { 122 const struct ipv6hdr *iph = nh; 123 iphdr->len = sizeof(struct ipv6hdr); 124 iphdr->protocol = iph->nexthdr; 125 ipv6_addr_copy(&iphdr->saddr.in6, &iph->saddr); 126 ipv6_addr_copy(&iphdr->daddr.in6, &iph->daddr); 127 } else 128 #endif 129 { 130 const struct iphdr *iph = nh; 131 iphdr->len = iph->ihl * 4; 132 iphdr->protocol = iph->protocol; 133 iphdr->saddr.ip = iph->saddr; 134 iphdr->daddr.ip = iph->daddr; 135 } 136 } 137 138 static inline void ip_vs_addr_copy(int af, union nf_inet_addr *dst, 139 const union nf_inet_addr *src) 140 { 141 #ifdef CONFIG_IP_VS_IPV6 142 if (af == AF_INET6) 143 ipv6_addr_copy(&dst->in6, &src->in6); 144 else 145 #endif 146 dst->ip = src->ip; 147 } 148 149 static inline int ip_vs_addr_equal(int af, const union nf_inet_addr *a, 150 const union nf_inet_addr *b) 151 { 152 #ifdef CONFIG_IP_VS_IPV6 153 if (af == AF_INET6) 154 return ipv6_addr_equal(&a->in6, &b->in6); 155 #endif 156 return a->ip == b->ip; 157 } 158 159 #ifdef CONFIG_IP_VS_DEBUG 160 #include <linux/net.h> 161 162 extern int ip_vs_get_debug_level(void); 163 164 static inline const char *ip_vs_dbg_addr(int af, char *buf, size_t buf_len, 165 const union nf_inet_addr *addr, 166 int *idx) 167 { 168 int len; 169 #ifdef CONFIG_IP_VS_IPV6 170 if (af == AF_INET6) 171 len = snprintf(&buf[*idx], buf_len - *idx, "[%pI6]", 172 &addr->in6) + 1; 173 else 174 #endif 175 len = snprintf(&buf[*idx], buf_len - *idx, "%pI4", 176 &addr->ip) + 1; 177 178 *idx += len; 179 BUG_ON(*idx > buf_len + 1); 180 return &buf[*idx - len]; 181 } 182 183 #define IP_VS_DBG_BUF(level, msg, ...) \ 184 do { \ 185 char ip_vs_dbg_buf[160]; \ 186 int ip_vs_dbg_idx = 0; \ 187 if (level <= ip_vs_get_debug_level()) \ 188 printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \ 189 } while (0) 190 #define IP_VS_ERR_BUF(msg...) \ 191 do { \ 192 char ip_vs_dbg_buf[160]; \ 193 int ip_vs_dbg_idx = 0; \ 194 pr_err(msg); \ 195 } while (0) 196 197 /* Only use from within IP_VS_DBG_BUF() or IP_VS_ERR_BUF macros */ 198 #define IP_VS_DBG_ADDR(af, addr) \ 199 ip_vs_dbg_addr(af, ip_vs_dbg_buf, \ 200 sizeof(ip_vs_dbg_buf), addr, \ 201 &ip_vs_dbg_idx) 202 203 #define IP_VS_DBG(level, msg, ...) \ 204 do { \ 205 if (level <= ip_vs_get_debug_level()) \ 206 printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \ 207 } while (0) 208 #define IP_VS_DBG_RL(msg, ...) \ 209 do { \ 210 if (net_ratelimit()) \ 211 printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \ 212 } while (0) 213 #define IP_VS_DBG_PKT(level, af, pp, skb, ofs, msg) \ 214 do { \ 215 if (level <= ip_vs_get_debug_level()) \ 216 pp->debug_packet(af, pp, skb, ofs, msg); \ 217 } while (0) 218 #define IP_VS_DBG_RL_PKT(level, af, pp, skb, ofs, msg) \ 219 do { \ 220 if (level <= ip_vs_get_debug_level() && \ 221 net_ratelimit()) \ 222 pp->debug_packet(af, pp, skb, ofs, msg); \ 223 } while (0) 224 #else /* NO DEBUGGING at ALL */ 225 #define IP_VS_DBG_BUF(level, msg...) do {} while (0) 226 #define IP_VS_ERR_BUF(msg...) do {} while (0) 227 #define IP_VS_DBG(level, msg...) do {} while (0) 228 #define IP_VS_DBG_RL(msg...) do {} while (0) 229 #define IP_VS_DBG_PKT(level, af, pp, skb, ofs, msg) do {} while (0) 230 #define IP_VS_DBG_RL_PKT(level, af, pp, skb, ofs, msg) do {} while (0) 231 #endif 232 233 #define IP_VS_BUG() BUG() 234 #define IP_VS_ERR_RL(msg, ...) \ 235 do { \ 236 if (net_ratelimit()) \ 237 pr_err(msg, ##__VA_ARGS__); \ 238 } while (0) 239 240 #ifdef CONFIG_IP_VS_DEBUG 241 #define EnterFunction(level) \ 242 do { \ 243 if (level <= ip_vs_get_debug_level()) \ 244 printk(KERN_DEBUG \ 245 pr_fmt("Enter: %s, %s line %i\n"), \ 246 __func__, __FILE__, __LINE__); \ 247 } while (0) 248 #define LeaveFunction(level) \ 249 do { \ 250 if (level <= ip_vs_get_debug_level()) \ 251 printk(KERN_DEBUG \ 252 pr_fmt("Leave: %s, %s line %i\n"), \ 253 __func__, __FILE__, __LINE__); \ 254 } while (0) 255 #else 256 #define EnterFunction(level) do {} while (0) 257 #define LeaveFunction(level) do {} while (0) 258 #endif 259 260 #define IP_VS_WAIT_WHILE(expr) while (expr) { cpu_relax(); } 261 262 263 /* 264 * The port number of FTP service (in network order). 265 */ 266 #define FTPPORT cpu_to_be16(21) 267 #define FTPDATA cpu_to_be16(20) 268 269 /* 270 * TCP State Values 271 */ 272 enum { 273 IP_VS_TCP_S_NONE = 0, 274 IP_VS_TCP_S_ESTABLISHED, 275 IP_VS_TCP_S_SYN_SENT, 276 IP_VS_TCP_S_SYN_RECV, 277 IP_VS_TCP_S_FIN_WAIT, 278 IP_VS_TCP_S_TIME_WAIT, 279 IP_VS_TCP_S_CLOSE, 280 IP_VS_TCP_S_CLOSE_WAIT, 281 IP_VS_TCP_S_LAST_ACK, 282 IP_VS_TCP_S_LISTEN, 283 IP_VS_TCP_S_SYNACK, 284 IP_VS_TCP_S_LAST 285 }; 286 287 /* 288 * UDP State Values 289 */ 290 enum { 291 IP_VS_UDP_S_NORMAL, 292 IP_VS_UDP_S_LAST, 293 }; 294 295 /* 296 * ICMP State Values 297 */ 298 enum { 299 IP_VS_ICMP_S_NORMAL, 300 IP_VS_ICMP_S_LAST, 301 }; 302 303 /* 304 * SCTP State Values 305 */ 306 enum ip_vs_sctp_states { 307 IP_VS_SCTP_S_NONE, 308 IP_VS_SCTP_S_INIT_CLI, 309 IP_VS_SCTP_S_INIT_SER, 310 IP_VS_SCTP_S_INIT_ACK_CLI, 311 IP_VS_SCTP_S_INIT_ACK_SER, 312 IP_VS_SCTP_S_ECHO_CLI, 313 IP_VS_SCTP_S_ECHO_SER, 314 IP_VS_SCTP_S_ESTABLISHED, 315 IP_VS_SCTP_S_SHUT_CLI, 316 IP_VS_SCTP_S_SHUT_SER, 317 IP_VS_SCTP_S_SHUT_ACK_CLI, 318 IP_VS_SCTP_S_SHUT_ACK_SER, 319 IP_VS_SCTP_S_CLOSED, 320 IP_VS_SCTP_S_LAST 321 }; 322 323 /* 324 * Delta sequence info structure 325 * Each ip_vs_conn has 2 (output AND input seq. changes). 326 * Only used in the VS/NAT. 327 */ 328 struct ip_vs_seq { 329 __u32 init_seq; /* Add delta from this seq */ 330 __u32 delta; /* Delta in sequence numbers */ 331 __u32 previous_delta; /* Delta in sequence numbers 332 before last resized pkt */ 333 }; 334 335 /* 336 * counters per cpu 337 */ 338 struct ip_vs_counters { 339 __u32 conns; /* connections scheduled */ 340 __u32 inpkts; /* incoming packets */ 341 __u32 outpkts; /* outgoing packets */ 342 __u64 inbytes; /* incoming bytes */ 343 __u64 outbytes; /* outgoing bytes */ 344 }; 345 /* 346 * Stats per cpu 347 */ 348 struct ip_vs_cpu_stats { 349 struct ip_vs_counters ustats; 350 struct u64_stats_sync syncp; 351 }; 352 353 /* 354 * IPVS statistics objects 355 */ 356 struct ip_vs_estimator { 357 struct list_head list; 358 359 u64 last_inbytes; 360 u64 last_outbytes; 361 u32 last_conns; 362 u32 last_inpkts; 363 u32 last_outpkts; 364 365 u32 cps; 366 u32 inpps; 367 u32 outpps; 368 u32 inbps; 369 u32 outbps; 370 }; 371 372 struct ip_vs_stats { 373 struct ip_vs_stats_user ustats; /* statistics */ 374 struct ip_vs_estimator est; /* estimator */ 375 struct ip_vs_cpu_stats *cpustats; /* per cpu counters */ 376 spinlock_t lock; /* spin lock */ 377 struct ip_vs_stats_user ustats0; /* reset values */ 378 }; 379 380 struct dst_entry; 381 struct iphdr; 382 struct ip_vs_conn; 383 struct ip_vs_app; 384 struct sk_buff; 385 struct ip_vs_proto_data; 386 387 struct ip_vs_protocol { 388 struct ip_vs_protocol *next; 389 char *name; 390 u16 protocol; 391 u16 num_states; 392 int dont_defrag; 393 394 void (*init)(struct ip_vs_protocol *pp); 395 396 void (*exit)(struct ip_vs_protocol *pp); 397 398 void (*init_netns)(struct net *net, struct ip_vs_proto_data *pd); 399 400 void (*exit_netns)(struct net *net, struct ip_vs_proto_data *pd); 401 402 int (*conn_schedule)(int af, struct sk_buff *skb, 403 struct ip_vs_proto_data *pd, 404 int *verdict, struct ip_vs_conn **cpp); 405 406 struct ip_vs_conn * 407 (*conn_in_get)(int af, 408 const struct sk_buff *skb, 409 const struct ip_vs_iphdr *iph, 410 unsigned int proto_off, 411 int inverse); 412 413 struct ip_vs_conn * 414 (*conn_out_get)(int af, 415 const struct sk_buff *skb, 416 const struct ip_vs_iphdr *iph, 417 unsigned int proto_off, 418 int inverse); 419 420 int (*snat_handler)(struct sk_buff *skb, 421 struct ip_vs_protocol *pp, struct ip_vs_conn *cp); 422 423 int (*dnat_handler)(struct sk_buff *skb, 424 struct ip_vs_protocol *pp, struct ip_vs_conn *cp); 425 426 int (*csum_check)(int af, struct sk_buff *skb, 427 struct ip_vs_protocol *pp); 428 429 const char *(*state_name)(int state); 430 431 int (*state_transition)(struct ip_vs_conn *cp, int direction, 432 const struct sk_buff *skb, 433 struct ip_vs_proto_data *pd); 434 435 int (*register_app)(struct net *net, struct ip_vs_app *inc); 436 437 void (*unregister_app)(struct net *net, struct ip_vs_app *inc); 438 439 int (*app_conn_bind)(struct ip_vs_conn *cp); 440 441 void (*debug_packet)(int af, struct ip_vs_protocol *pp, 442 const struct sk_buff *skb, 443 int offset, 444 const char *msg); 445 446 void (*timeout_change)(struct ip_vs_proto_data *pd, int flags); 447 }; 448 449 /* 450 * protocol data per netns 451 */ 452 struct ip_vs_proto_data { 453 struct ip_vs_proto_data *next; 454 struct ip_vs_protocol *pp; 455 int *timeout_table; /* protocol timeout table */ 456 atomic_t appcnt; /* counter of proto app incs. */ 457 struct tcp_states_t *tcp_state_table; 458 }; 459 460 extern struct ip_vs_protocol *ip_vs_proto_get(unsigned short proto); 461 extern struct ip_vs_proto_data *ip_vs_proto_data_get(struct net *net, 462 unsigned short proto); 463 464 struct ip_vs_conn_param { 465 struct net *net; 466 const union nf_inet_addr *caddr; 467 const union nf_inet_addr *vaddr; 468 __be16 cport; 469 __be16 vport; 470 __u16 protocol; 471 u16 af; 472 473 const struct ip_vs_pe *pe; 474 char *pe_data; 475 __u8 pe_data_len; 476 }; 477 478 /* 479 * IP_VS structure allocated for each dynamically scheduled connection 480 */ 481 struct ip_vs_conn { 482 struct hlist_node c_list; /* hashed list heads */ 483 #ifdef CONFIG_NET_NS 484 struct net *net; /* Name space */ 485 #endif 486 /* Protocol, addresses and port numbers */ 487 u16 af; /* address family */ 488 __be16 cport; 489 __be16 vport; 490 __be16 dport; 491 __u32 fwmark; /* Fire wall mark from skb */ 492 union nf_inet_addr caddr; /* client address */ 493 union nf_inet_addr vaddr; /* virtual address */ 494 union nf_inet_addr daddr; /* destination address */ 495 volatile __u32 flags; /* status flags */ 496 __u16 protocol; /* Which protocol (TCP/UDP) */ 497 498 /* counter and timer */ 499 atomic_t refcnt; /* reference count */ 500 struct timer_list timer; /* Expiration timer */ 501 volatile unsigned long timeout; /* timeout */ 502 503 /* Flags and state transition */ 504 spinlock_t lock; /* lock for state transition */ 505 volatile __u16 state; /* state info */ 506 volatile __u16 old_state; /* old state, to be used for 507 * state transition triggerd 508 * synchronization 509 */ 510 511 /* Control members */ 512 struct ip_vs_conn *control; /* Master control connection */ 513 atomic_t n_control; /* Number of controlled ones */ 514 struct ip_vs_dest *dest; /* real server */ 515 atomic_t in_pkts; /* incoming packet counter */ 516 517 /* packet transmitter for different forwarding methods. If it 518 mangles the packet, it must return NF_DROP or better NF_STOLEN, 519 otherwise this must be changed to a sk_buff **. 520 NF_ACCEPT can be returned when destination is local. 521 */ 522 int (*packet_xmit)(struct sk_buff *skb, struct ip_vs_conn *cp, 523 struct ip_vs_protocol *pp); 524 525 /* Note: we can group the following members into a structure, 526 in order to save more space, and the following members are 527 only used in VS/NAT anyway */ 528 struct ip_vs_app *app; /* bound ip_vs_app object */ 529 void *app_data; /* Application private data */ 530 struct ip_vs_seq in_seq; /* incoming seq. struct */ 531 struct ip_vs_seq out_seq; /* outgoing seq. struct */ 532 533 const struct ip_vs_pe *pe; 534 char *pe_data; 535 __u8 pe_data_len; 536 }; 537 538 /* 539 * To save some memory in conn table when name space is disabled. 540 */ 541 static inline struct net *ip_vs_conn_net(const struct ip_vs_conn *cp) 542 { 543 #ifdef CONFIG_NET_NS 544 return cp->net; 545 #else 546 return &init_net; 547 #endif 548 } 549 static inline void ip_vs_conn_net_set(struct ip_vs_conn *cp, struct net *net) 550 { 551 #ifdef CONFIG_NET_NS 552 cp->net = net; 553 #endif 554 } 555 556 static inline int ip_vs_conn_net_eq(const struct ip_vs_conn *cp, 557 struct net *net) 558 { 559 #ifdef CONFIG_NET_NS 560 return cp->net == net; 561 #else 562 return 1; 563 #endif 564 } 565 566 /* 567 * Extended internal versions of struct ip_vs_service_user and 568 * ip_vs_dest_user for IPv6 support. 569 * 570 * We need these to conveniently pass around service and destination 571 * options, but unfortunately, we also need to keep the old definitions to 572 * maintain userspace backwards compatibility for the setsockopt interface. 573 */ 574 struct ip_vs_service_user_kern { 575 /* virtual service addresses */ 576 u16 af; 577 u16 protocol; 578 union nf_inet_addr addr; /* virtual ip address */ 579 u16 port; 580 u32 fwmark; /* firwall mark of service */ 581 582 /* virtual service options */ 583 char *sched_name; 584 char *pe_name; 585 unsigned flags; /* virtual service flags */ 586 unsigned timeout; /* persistent timeout in sec */ 587 u32 netmask; /* persistent netmask */ 588 }; 589 590 591 struct ip_vs_dest_user_kern { 592 /* destination server address */ 593 union nf_inet_addr addr; 594 u16 port; 595 596 /* real server options */ 597 unsigned conn_flags; /* connection flags */ 598 int weight; /* destination weight */ 599 600 /* thresholds for active connections */ 601 u32 u_threshold; /* upper threshold */ 602 u32 l_threshold; /* lower threshold */ 603 }; 604 605 606 /* 607 * The information about the virtual service offered to the net 608 * and the forwarding entries 609 */ 610 struct ip_vs_service { 611 struct list_head s_list; /* for normal service table */ 612 struct list_head f_list; /* for fwmark-based service table */ 613 atomic_t refcnt; /* reference counter */ 614 atomic_t usecnt; /* use counter */ 615 616 u16 af; /* address family */ 617 __u16 protocol; /* which protocol (TCP/UDP) */ 618 union nf_inet_addr addr; /* IP address for virtual service */ 619 __be16 port; /* port number for the service */ 620 __u32 fwmark; /* firewall mark of the service */ 621 unsigned flags; /* service status flags */ 622 unsigned timeout; /* persistent timeout in ticks */ 623 __be32 netmask; /* grouping granularity */ 624 struct net *net; 625 626 struct list_head destinations; /* real server d-linked list */ 627 __u32 num_dests; /* number of servers */ 628 struct ip_vs_stats stats; /* statistics for the service */ 629 struct ip_vs_app *inc; /* bind conns to this app inc */ 630 631 /* for scheduling */ 632 struct ip_vs_scheduler *scheduler; /* bound scheduler object */ 633 rwlock_t sched_lock; /* lock sched_data */ 634 void *sched_data; /* scheduler application data */ 635 636 /* alternate persistence engine */ 637 struct ip_vs_pe *pe; 638 }; 639 640 641 /* 642 * The real server destination forwarding entry 643 * with ip address, port number, and so on. 644 */ 645 struct ip_vs_dest { 646 struct list_head n_list; /* for the dests in the service */ 647 struct list_head d_list; /* for table with all the dests */ 648 649 u16 af; /* address family */ 650 __be16 port; /* port number of the server */ 651 union nf_inet_addr addr; /* IP address of the server */ 652 volatile unsigned flags; /* dest status flags */ 653 atomic_t conn_flags; /* flags to copy to conn */ 654 atomic_t weight; /* server weight */ 655 656 atomic_t refcnt; /* reference counter */ 657 struct ip_vs_stats stats; /* statistics */ 658 659 /* connection counters and thresholds */ 660 atomic_t activeconns; /* active connections */ 661 atomic_t inactconns; /* inactive connections */ 662 atomic_t persistconns; /* persistent connections */ 663 __u32 u_threshold; /* upper threshold */ 664 __u32 l_threshold; /* lower threshold */ 665 666 /* for destination cache */ 667 spinlock_t dst_lock; /* lock of dst_cache */ 668 struct dst_entry *dst_cache; /* destination cache entry */ 669 u32 dst_rtos; /* RT_TOS(tos) for dst */ 670 u32 dst_cookie; 671 #ifdef CONFIG_IP_VS_IPV6 672 struct in6_addr dst_saddr; 673 #endif 674 675 /* for virtual service */ 676 struct ip_vs_service *svc; /* service it belongs to */ 677 __u16 protocol; /* which protocol (TCP/UDP) */ 678 __be16 vport; /* virtual port number */ 679 union nf_inet_addr vaddr; /* virtual IP address */ 680 __u32 vfwmark; /* firewall mark of service */ 681 }; 682 683 684 /* 685 * The scheduler object 686 */ 687 struct ip_vs_scheduler { 688 struct list_head n_list; /* d-linked list head */ 689 char *name; /* scheduler name */ 690 atomic_t refcnt; /* reference counter */ 691 struct module *module; /* THIS_MODULE/NULL */ 692 693 /* scheduler initializing service */ 694 int (*init_service)(struct ip_vs_service *svc); 695 /* scheduling service finish */ 696 int (*done_service)(struct ip_vs_service *svc); 697 /* scheduler updating service */ 698 int (*update_service)(struct ip_vs_service *svc); 699 700 /* selecting a server from the given service */ 701 struct ip_vs_dest* (*schedule)(struct ip_vs_service *svc, 702 const struct sk_buff *skb); 703 }; 704 705 /* The persistence engine object */ 706 struct ip_vs_pe { 707 struct list_head n_list; /* d-linked list head */ 708 char *name; /* scheduler name */ 709 atomic_t refcnt; /* reference counter */ 710 struct module *module; /* THIS_MODULE/NULL */ 711 712 /* get the connection template, if any */ 713 int (*fill_param)(struct ip_vs_conn_param *p, struct sk_buff *skb); 714 bool (*ct_match)(const struct ip_vs_conn_param *p, 715 struct ip_vs_conn *ct); 716 u32 (*hashkey_raw)(const struct ip_vs_conn_param *p, u32 initval, 717 bool inverse); 718 int (*show_pe_data)(const struct ip_vs_conn *cp, char *buf); 719 }; 720 721 /* 722 * The application module object (a.k.a. app incarnation) 723 */ 724 struct ip_vs_app { 725 struct list_head a_list; /* member in app list */ 726 int type; /* IP_VS_APP_TYPE_xxx */ 727 char *name; /* application module name */ 728 __u16 protocol; 729 struct module *module; /* THIS_MODULE/NULL */ 730 struct list_head incs_list; /* list of incarnations */ 731 732 /* members for application incarnations */ 733 struct list_head p_list; /* member in proto app list */ 734 struct ip_vs_app *app; /* its real application */ 735 __be16 port; /* port number in net order */ 736 atomic_t usecnt; /* usage counter */ 737 738 /* 739 * output hook: Process packet in inout direction, diff set for TCP. 740 * Return: 0=Error, 1=Payload Not Mangled/Mangled but checksum is ok, 741 * 2=Mangled but checksum was not updated 742 */ 743 int (*pkt_out)(struct ip_vs_app *, struct ip_vs_conn *, 744 struct sk_buff *, int *diff); 745 746 /* 747 * input hook: Process packet in outin direction, diff set for TCP. 748 * Return: 0=Error, 1=Payload Not Mangled/Mangled but checksum is ok, 749 * 2=Mangled but checksum was not updated 750 */ 751 int (*pkt_in)(struct ip_vs_app *, struct ip_vs_conn *, 752 struct sk_buff *, int *diff); 753 754 /* ip_vs_app initializer */ 755 int (*init_conn)(struct ip_vs_app *, struct ip_vs_conn *); 756 757 /* ip_vs_app finish */ 758 int (*done_conn)(struct ip_vs_app *, struct ip_vs_conn *); 759 760 761 /* not used now */ 762 int (*bind_conn)(struct ip_vs_app *, struct ip_vs_conn *, 763 struct ip_vs_protocol *); 764 765 void (*unbind_conn)(struct ip_vs_app *, struct ip_vs_conn *); 766 767 int * timeout_table; 768 int * timeouts; 769 int timeouts_size; 770 771 int (*conn_schedule)(struct sk_buff *skb, struct ip_vs_app *app, 772 int *verdict, struct ip_vs_conn **cpp); 773 774 struct ip_vs_conn * 775 (*conn_in_get)(const struct sk_buff *skb, struct ip_vs_app *app, 776 const struct iphdr *iph, unsigned int proto_off, 777 int inverse); 778 779 struct ip_vs_conn * 780 (*conn_out_get)(const struct sk_buff *skb, struct ip_vs_app *app, 781 const struct iphdr *iph, unsigned int proto_off, 782 int inverse); 783 784 int (*state_transition)(struct ip_vs_conn *cp, int direction, 785 const struct sk_buff *skb, 786 struct ip_vs_app *app); 787 788 void (*timeout_change)(struct ip_vs_app *app, int flags); 789 }; 790 791 /* IPVS in network namespace */ 792 struct netns_ipvs { 793 int gen; /* Generation */ 794 int enable; /* enable like nf_hooks do */ 795 /* 796 * Hash table: for real service lookups 797 */ 798 #define IP_VS_RTAB_BITS 4 799 #define IP_VS_RTAB_SIZE (1 << IP_VS_RTAB_BITS) 800 #define IP_VS_RTAB_MASK (IP_VS_RTAB_SIZE - 1) 801 802 struct list_head rs_table[IP_VS_RTAB_SIZE]; 803 /* ip_vs_app */ 804 struct list_head app_list; 805 806 /* ip_vs_proto */ 807 #define IP_VS_PROTO_TAB_SIZE 32 /* must be power of 2 */ 808 struct ip_vs_proto_data *proto_data_table[IP_VS_PROTO_TAB_SIZE]; 809 /* ip_vs_proto_tcp */ 810 #ifdef CONFIG_IP_VS_PROTO_TCP 811 #define TCP_APP_TAB_BITS 4 812 #define TCP_APP_TAB_SIZE (1 << TCP_APP_TAB_BITS) 813 #define TCP_APP_TAB_MASK (TCP_APP_TAB_SIZE - 1) 814 struct list_head tcp_apps[TCP_APP_TAB_SIZE]; 815 spinlock_t tcp_app_lock; 816 #endif 817 /* ip_vs_proto_udp */ 818 #ifdef CONFIG_IP_VS_PROTO_UDP 819 #define UDP_APP_TAB_BITS 4 820 #define UDP_APP_TAB_SIZE (1 << UDP_APP_TAB_BITS) 821 #define UDP_APP_TAB_MASK (UDP_APP_TAB_SIZE - 1) 822 struct list_head udp_apps[UDP_APP_TAB_SIZE]; 823 spinlock_t udp_app_lock; 824 #endif 825 /* ip_vs_proto_sctp */ 826 #ifdef CONFIG_IP_VS_PROTO_SCTP 827 #define SCTP_APP_TAB_BITS 4 828 #define SCTP_APP_TAB_SIZE (1 << SCTP_APP_TAB_BITS) 829 #define SCTP_APP_TAB_MASK (SCTP_APP_TAB_SIZE - 1) 830 /* Hash table for SCTP application incarnations */ 831 struct list_head sctp_apps[SCTP_APP_TAB_SIZE]; 832 spinlock_t sctp_app_lock; 833 #endif 834 /* ip_vs_conn */ 835 atomic_t conn_count; /* connection counter */ 836 837 /* ip_vs_ctl */ 838 struct ip_vs_stats tot_stats; /* Statistics & est. */ 839 840 int num_services; /* no of virtual services */ 841 842 rwlock_t rs_lock; /* real services table */ 843 /* semaphore for IPVS sockopts. And, [gs]etsockopt may sleep. */ 844 struct lock_class_key ctl_key; /* ctl_mutex debuging */ 845 /* Trash for destinations */ 846 struct list_head dest_trash; 847 /* Service counters */ 848 atomic_t ftpsvc_counter; 849 atomic_t nullsvc_counter; 850 851 #ifdef CONFIG_SYSCTL 852 /* 1/rate drop and drop-entry variables */ 853 struct delayed_work defense_work; /* Work handler */ 854 int drop_rate; 855 int drop_counter; 856 atomic_t dropentry; 857 /* locks in ctl.c */ 858 spinlock_t dropentry_lock; /* drop entry handling */ 859 spinlock_t droppacket_lock; /* drop packet handling */ 860 spinlock_t securetcp_lock; /* state and timeout tables */ 861 862 /* sys-ctl struct */ 863 struct ctl_table_header *sysctl_hdr; 864 struct ctl_table *sysctl_tbl; 865 #endif 866 867 /* sysctl variables */ 868 int sysctl_amemthresh; 869 int sysctl_am_droprate; 870 int sysctl_drop_entry; 871 int sysctl_drop_packet; 872 int sysctl_secure_tcp; 873 #ifdef CONFIG_IP_VS_NFCT 874 int sysctl_conntrack; 875 #endif 876 int sysctl_snat_reroute; 877 int sysctl_sync_ver; 878 int sysctl_cache_bypass; 879 int sysctl_expire_nodest_conn; 880 int sysctl_expire_quiescent_template; 881 int sysctl_sync_threshold[2]; 882 int sysctl_nat_icmp_send; 883 884 /* ip_vs_lblc */ 885 int sysctl_lblc_expiration; 886 struct ctl_table_header *lblc_ctl_header; 887 struct ctl_table *lblc_ctl_table; 888 /* ip_vs_lblcr */ 889 int sysctl_lblcr_expiration; 890 struct ctl_table_header *lblcr_ctl_header; 891 struct ctl_table *lblcr_ctl_table; 892 /* ip_vs_est */ 893 struct list_head est_list; /* estimator list */ 894 spinlock_t est_lock; 895 struct timer_list est_timer; /* Estimation timer */ 896 /* ip_vs_sync */ 897 struct list_head sync_queue; 898 spinlock_t sync_lock; 899 struct ip_vs_sync_buff *sync_buff; 900 spinlock_t sync_buff_lock; 901 struct sockaddr_in sync_mcast_addr; 902 struct task_struct *master_thread; 903 struct task_struct *backup_thread; 904 int send_mesg_maxlen; 905 int recv_mesg_maxlen; 906 volatile int sync_state; 907 volatile int master_syncid; 908 volatile int backup_syncid; 909 /* multicast interface name */ 910 char master_mcast_ifn[IP_VS_IFNAME_MAXLEN]; 911 char backup_mcast_ifn[IP_VS_IFNAME_MAXLEN]; 912 /* net name space ptr */ 913 struct net *net; /* Needed by timer routines */ 914 }; 915 916 #define DEFAULT_SYNC_THRESHOLD 3 917 #define DEFAULT_SYNC_PERIOD 50 918 #define DEFAULT_SYNC_VER 1 919 920 #ifdef CONFIG_SYSCTL 921 922 static inline int sysctl_sync_threshold(struct netns_ipvs *ipvs) 923 { 924 return ipvs->sysctl_sync_threshold[0]; 925 } 926 927 static inline int sysctl_sync_period(struct netns_ipvs *ipvs) 928 { 929 return ipvs->sysctl_sync_threshold[1]; 930 } 931 932 static inline int sysctl_sync_ver(struct netns_ipvs *ipvs) 933 { 934 return ipvs->sysctl_sync_ver; 935 } 936 937 #else 938 939 static inline int sysctl_sync_threshold(struct netns_ipvs *ipvs) 940 { 941 return DEFAULT_SYNC_THRESHOLD; 942 } 943 944 static inline int sysctl_sync_period(struct netns_ipvs *ipvs) 945 { 946 return DEFAULT_SYNC_PERIOD; 947 } 948 949 static inline int sysctl_sync_ver(struct netns_ipvs *ipvs) 950 { 951 return DEFAULT_SYNC_VER; 952 } 953 954 #endif 955 956 /* 957 * IPVS core functions 958 * (from ip_vs_core.c) 959 */ 960 extern const char *ip_vs_proto_name(unsigned proto); 961 extern void ip_vs_init_hash_table(struct list_head *table, int rows); 962 #define IP_VS_INIT_HASH_TABLE(t) ip_vs_init_hash_table((t), ARRAY_SIZE((t))) 963 964 #define IP_VS_APP_TYPE_FTP 1 965 966 /* 967 * ip_vs_conn handling functions 968 * (from ip_vs_conn.c) 969 */ 970 971 enum { 972 IP_VS_DIR_INPUT = 0, 973 IP_VS_DIR_OUTPUT, 974 IP_VS_DIR_INPUT_ONLY, 975 IP_VS_DIR_LAST, 976 }; 977 978 static inline void ip_vs_conn_fill_param(struct net *net, int af, int protocol, 979 const union nf_inet_addr *caddr, 980 __be16 cport, 981 const union nf_inet_addr *vaddr, 982 __be16 vport, 983 struct ip_vs_conn_param *p) 984 { 985 p->net = net; 986 p->af = af; 987 p->protocol = protocol; 988 p->caddr = caddr; 989 p->cport = cport; 990 p->vaddr = vaddr; 991 p->vport = vport; 992 p->pe = NULL; 993 p->pe_data = NULL; 994 } 995 996 struct ip_vs_conn *ip_vs_conn_in_get(const struct ip_vs_conn_param *p); 997 struct ip_vs_conn *ip_vs_ct_in_get(const struct ip_vs_conn_param *p); 998 999 struct ip_vs_conn * ip_vs_conn_in_get_proto(int af, const struct sk_buff *skb, 1000 const struct ip_vs_iphdr *iph, 1001 unsigned int proto_off, 1002 int inverse); 1003 1004 struct ip_vs_conn *ip_vs_conn_out_get(const struct ip_vs_conn_param *p); 1005 1006 struct ip_vs_conn * ip_vs_conn_out_get_proto(int af, const struct sk_buff *skb, 1007 const struct ip_vs_iphdr *iph, 1008 unsigned int proto_off, 1009 int inverse); 1010 1011 /* put back the conn without restarting its timer */ 1012 static inline void __ip_vs_conn_put(struct ip_vs_conn *cp) 1013 { 1014 atomic_dec(&cp->refcnt); 1015 } 1016 extern void ip_vs_conn_put(struct ip_vs_conn *cp); 1017 extern void ip_vs_conn_fill_cport(struct ip_vs_conn *cp, __be16 cport); 1018 1019 struct ip_vs_conn *ip_vs_conn_new(const struct ip_vs_conn_param *p, 1020 const union nf_inet_addr *daddr, 1021 __be16 dport, unsigned flags, 1022 struct ip_vs_dest *dest, __u32 fwmark); 1023 extern void ip_vs_conn_expire_now(struct ip_vs_conn *cp); 1024 1025 extern const char * ip_vs_state_name(__u16 proto, int state); 1026 1027 extern void ip_vs_tcp_conn_listen(struct net *net, struct ip_vs_conn *cp); 1028 extern int ip_vs_check_template(struct ip_vs_conn *ct); 1029 extern void ip_vs_random_dropentry(struct net *net); 1030 extern int ip_vs_conn_init(void); 1031 extern void ip_vs_conn_cleanup(void); 1032 1033 static inline void ip_vs_control_del(struct ip_vs_conn *cp) 1034 { 1035 struct ip_vs_conn *ctl_cp = cp->control; 1036 if (!ctl_cp) { 1037 IP_VS_ERR_BUF("request control DEL for uncontrolled: " 1038 "%s:%d to %s:%d\n", 1039 IP_VS_DBG_ADDR(cp->af, &cp->caddr), 1040 ntohs(cp->cport), 1041 IP_VS_DBG_ADDR(cp->af, &cp->vaddr), 1042 ntohs(cp->vport)); 1043 1044 return; 1045 } 1046 1047 IP_VS_DBG_BUF(7, "DELeting control for: " 1048 "cp.dst=%s:%d ctl_cp.dst=%s:%d\n", 1049 IP_VS_DBG_ADDR(cp->af, &cp->caddr), 1050 ntohs(cp->cport), 1051 IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr), 1052 ntohs(ctl_cp->cport)); 1053 1054 cp->control = NULL; 1055 if (atomic_read(&ctl_cp->n_control) == 0) { 1056 IP_VS_ERR_BUF("BUG control DEL with n=0 : " 1057 "%s:%d to %s:%d\n", 1058 IP_VS_DBG_ADDR(cp->af, &cp->caddr), 1059 ntohs(cp->cport), 1060 IP_VS_DBG_ADDR(cp->af, &cp->vaddr), 1061 ntohs(cp->vport)); 1062 1063 return; 1064 } 1065 atomic_dec(&ctl_cp->n_control); 1066 } 1067 1068 static inline void 1069 ip_vs_control_add(struct ip_vs_conn *cp, struct ip_vs_conn *ctl_cp) 1070 { 1071 if (cp->control) { 1072 IP_VS_ERR_BUF("request control ADD for already controlled: " 1073 "%s:%d to %s:%d\n", 1074 IP_VS_DBG_ADDR(cp->af, &cp->caddr), 1075 ntohs(cp->cport), 1076 IP_VS_DBG_ADDR(cp->af, &cp->vaddr), 1077 ntohs(cp->vport)); 1078 1079 ip_vs_control_del(cp); 1080 } 1081 1082 IP_VS_DBG_BUF(7, "ADDing control for: " 1083 "cp.dst=%s:%d ctl_cp.dst=%s:%d\n", 1084 IP_VS_DBG_ADDR(cp->af, &cp->caddr), 1085 ntohs(cp->cport), 1086 IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr), 1087 ntohs(ctl_cp->cport)); 1088 1089 cp->control = ctl_cp; 1090 atomic_inc(&ctl_cp->n_control); 1091 } 1092 1093 /* 1094 * IPVS netns init & cleanup functions 1095 */ 1096 extern int __ip_vs_estimator_init(struct net *net); 1097 extern int __ip_vs_control_init(struct net *net); 1098 extern int __ip_vs_protocol_init(struct net *net); 1099 extern int __ip_vs_app_init(struct net *net); 1100 extern int __ip_vs_conn_init(struct net *net); 1101 extern int __ip_vs_sync_init(struct net *net); 1102 extern void __ip_vs_conn_cleanup(struct net *net); 1103 extern void __ip_vs_app_cleanup(struct net *net); 1104 extern void __ip_vs_protocol_cleanup(struct net *net); 1105 extern void __ip_vs_control_cleanup(struct net *net); 1106 extern void __ip_vs_estimator_cleanup(struct net *net); 1107 extern void __ip_vs_sync_cleanup(struct net *net); 1108 extern void __ip_vs_service_cleanup(struct net *net); 1109 1110 /* 1111 * IPVS application functions 1112 * (from ip_vs_app.c) 1113 */ 1114 #define IP_VS_APP_MAX_PORTS 8 1115 extern int register_ip_vs_app(struct net *net, struct ip_vs_app *app); 1116 extern void unregister_ip_vs_app(struct net *net, struct ip_vs_app *app); 1117 extern int ip_vs_bind_app(struct ip_vs_conn *cp, struct ip_vs_protocol *pp); 1118 extern void ip_vs_unbind_app(struct ip_vs_conn *cp); 1119 extern int register_ip_vs_app_inc(struct net *net, struct ip_vs_app *app, 1120 __u16 proto, __u16 port); 1121 extern int ip_vs_app_inc_get(struct ip_vs_app *inc); 1122 extern void ip_vs_app_inc_put(struct ip_vs_app *inc); 1123 1124 extern int ip_vs_app_pkt_out(struct ip_vs_conn *, struct sk_buff *skb); 1125 extern int ip_vs_app_pkt_in(struct ip_vs_conn *, struct sk_buff *skb); 1126 extern int ip_vs_app_init(void); 1127 extern void ip_vs_app_cleanup(void); 1128 1129 void ip_vs_bind_pe(struct ip_vs_service *svc, struct ip_vs_pe *pe); 1130 void ip_vs_unbind_pe(struct ip_vs_service *svc); 1131 int register_ip_vs_pe(struct ip_vs_pe *pe); 1132 int unregister_ip_vs_pe(struct ip_vs_pe *pe); 1133 struct ip_vs_pe *ip_vs_pe_getbyname(const char *name); 1134 struct ip_vs_pe *__ip_vs_pe_getbyname(const char *pe_name); 1135 1136 static inline void ip_vs_pe_get(const struct ip_vs_pe *pe) 1137 { 1138 if (pe && pe->module) 1139 __module_get(pe->module); 1140 } 1141 1142 static inline void ip_vs_pe_put(const struct ip_vs_pe *pe) 1143 { 1144 if (pe && pe->module) 1145 module_put(pe->module); 1146 } 1147 1148 /* 1149 * IPVS protocol functions (from ip_vs_proto.c) 1150 */ 1151 extern int ip_vs_protocol_init(void); 1152 extern void ip_vs_protocol_cleanup(void); 1153 extern void ip_vs_protocol_timeout_change(struct netns_ipvs *ipvs, int flags); 1154 extern int *ip_vs_create_timeout_table(int *table, int size); 1155 extern int 1156 ip_vs_set_state_timeout(int *table, int num, const char *const *names, 1157 const char *name, int to); 1158 extern void 1159 ip_vs_tcpudp_debug_packet(int af, struct ip_vs_protocol *pp, 1160 const struct sk_buff *skb, 1161 int offset, const char *msg); 1162 1163 extern struct ip_vs_protocol ip_vs_protocol_tcp; 1164 extern struct ip_vs_protocol ip_vs_protocol_udp; 1165 extern struct ip_vs_protocol ip_vs_protocol_icmp; 1166 extern struct ip_vs_protocol ip_vs_protocol_esp; 1167 extern struct ip_vs_protocol ip_vs_protocol_ah; 1168 extern struct ip_vs_protocol ip_vs_protocol_sctp; 1169 1170 /* 1171 * Registering/unregistering scheduler functions 1172 * (from ip_vs_sched.c) 1173 */ 1174 extern int register_ip_vs_scheduler(struct ip_vs_scheduler *scheduler); 1175 extern int unregister_ip_vs_scheduler(struct ip_vs_scheduler *scheduler); 1176 extern int ip_vs_bind_scheduler(struct ip_vs_service *svc, 1177 struct ip_vs_scheduler *scheduler); 1178 extern int ip_vs_unbind_scheduler(struct ip_vs_service *svc); 1179 extern struct ip_vs_scheduler *ip_vs_scheduler_get(const char *sched_name); 1180 extern void ip_vs_scheduler_put(struct ip_vs_scheduler *scheduler); 1181 extern struct ip_vs_conn * 1182 ip_vs_schedule(struct ip_vs_service *svc, struct sk_buff *skb, 1183 struct ip_vs_proto_data *pd, int *ignored); 1184 extern int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb, 1185 struct ip_vs_proto_data *pd); 1186 1187 extern void ip_vs_scheduler_err(struct ip_vs_service *svc, const char *msg); 1188 1189 1190 /* 1191 * IPVS control data and functions (from ip_vs_ctl.c) 1192 */ 1193 extern struct ip_vs_stats ip_vs_stats; 1194 extern const struct ctl_path net_vs_ctl_path[]; 1195 extern int sysctl_ip_vs_sync_ver; 1196 1197 extern void ip_vs_sync_switch_mode(struct net *net, int mode); 1198 extern struct ip_vs_service * 1199 ip_vs_service_get(struct net *net, int af, __u32 fwmark, __u16 protocol, 1200 const union nf_inet_addr *vaddr, __be16 vport); 1201 1202 static inline void ip_vs_service_put(struct ip_vs_service *svc) 1203 { 1204 atomic_dec(&svc->usecnt); 1205 } 1206 1207 extern struct ip_vs_dest * 1208 ip_vs_lookup_real_service(struct net *net, int af, __u16 protocol, 1209 const union nf_inet_addr *daddr, __be16 dport); 1210 1211 extern int ip_vs_use_count_inc(void); 1212 extern void ip_vs_use_count_dec(void); 1213 extern int ip_vs_control_init(void); 1214 extern void ip_vs_control_cleanup(void); 1215 extern struct ip_vs_dest * 1216 ip_vs_find_dest(struct net *net, int af, const union nf_inet_addr *daddr, 1217 __be16 dport, const union nf_inet_addr *vaddr, __be16 vport, 1218 __u16 protocol, __u32 fwmark); 1219 extern struct ip_vs_dest *ip_vs_try_bind_dest(struct ip_vs_conn *cp); 1220 1221 1222 /* 1223 * IPVS sync daemon data and function prototypes 1224 * (from ip_vs_sync.c) 1225 */ 1226 extern int start_sync_thread(struct net *net, int state, char *mcast_ifn, 1227 __u8 syncid); 1228 extern int stop_sync_thread(struct net *net, int state); 1229 extern void ip_vs_sync_conn(struct net *net, struct ip_vs_conn *cp); 1230 extern int ip_vs_sync_init(void); 1231 extern void ip_vs_sync_cleanup(void); 1232 1233 1234 /* 1235 * IPVS rate estimator prototypes (from ip_vs_est.c) 1236 */ 1237 extern int ip_vs_estimator_init(void); 1238 extern void ip_vs_estimator_cleanup(void); 1239 extern void ip_vs_start_estimator(struct net *net, struct ip_vs_stats *stats); 1240 extern void ip_vs_stop_estimator(struct net *net, struct ip_vs_stats *stats); 1241 extern void ip_vs_zero_estimator(struct ip_vs_stats *stats); 1242 extern void ip_vs_read_estimator(struct ip_vs_stats_user *dst, 1243 struct ip_vs_stats *stats); 1244 1245 /* 1246 * Various IPVS packet transmitters (from ip_vs_xmit.c) 1247 */ 1248 extern int ip_vs_null_xmit 1249 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp); 1250 extern int ip_vs_bypass_xmit 1251 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp); 1252 extern int ip_vs_nat_xmit 1253 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp); 1254 extern int ip_vs_tunnel_xmit 1255 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp); 1256 extern int ip_vs_dr_xmit 1257 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp); 1258 extern int ip_vs_icmp_xmit 1259 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp, int offset); 1260 extern void ip_vs_dst_reset(struct ip_vs_dest *dest); 1261 1262 #ifdef CONFIG_IP_VS_IPV6 1263 extern int ip_vs_bypass_xmit_v6 1264 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp); 1265 extern int ip_vs_nat_xmit_v6 1266 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp); 1267 extern int ip_vs_tunnel_xmit_v6 1268 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp); 1269 extern int ip_vs_dr_xmit_v6 1270 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp); 1271 extern int ip_vs_icmp_xmit_v6 1272 (struct sk_buff *skb, struct ip_vs_conn *cp, struct ip_vs_protocol *pp, 1273 int offset); 1274 #endif 1275 1276 #ifdef CONFIG_SYSCTL 1277 /* 1278 * This is a simple mechanism to ignore packets when 1279 * we are loaded. Just set ip_vs_drop_rate to 'n' and 1280 * we start to drop 1/rate of the packets 1281 */ 1282 1283 static inline int ip_vs_todrop(struct netns_ipvs *ipvs) 1284 { 1285 if (!ipvs->drop_rate) 1286 return 0; 1287 if (--ipvs->drop_counter > 0) 1288 return 0; 1289 ipvs->drop_counter = ipvs->drop_rate; 1290 return 1; 1291 } 1292 #else 1293 static inline int ip_vs_todrop(struct netns_ipvs *ipvs) { return 0; } 1294 #endif 1295 1296 /* 1297 * ip_vs_fwd_tag returns the forwarding tag of the connection 1298 */ 1299 #define IP_VS_FWD_METHOD(cp) (cp->flags & IP_VS_CONN_F_FWD_MASK) 1300 1301 static inline char ip_vs_fwd_tag(struct ip_vs_conn *cp) 1302 { 1303 char fwd; 1304 1305 switch (IP_VS_FWD_METHOD(cp)) { 1306 case IP_VS_CONN_F_MASQ: 1307 fwd = 'M'; break; 1308 case IP_VS_CONN_F_LOCALNODE: 1309 fwd = 'L'; break; 1310 case IP_VS_CONN_F_TUNNEL: 1311 fwd = 'T'; break; 1312 case IP_VS_CONN_F_DROUTE: 1313 fwd = 'R'; break; 1314 case IP_VS_CONN_F_BYPASS: 1315 fwd = 'B'; break; 1316 default: 1317 fwd = '?'; break; 1318 } 1319 return fwd; 1320 } 1321 1322 extern void ip_vs_nat_icmp(struct sk_buff *skb, struct ip_vs_protocol *pp, 1323 struct ip_vs_conn *cp, int dir); 1324 1325 #ifdef CONFIG_IP_VS_IPV6 1326 extern void ip_vs_nat_icmp_v6(struct sk_buff *skb, struct ip_vs_protocol *pp, 1327 struct ip_vs_conn *cp, int dir); 1328 #endif 1329 1330 extern __sum16 ip_vs_checksum_complete(struct sk_buff *skb, int offset); 1331 1332 static inline __wsum ip_vs_check_diff4(__be32 old, __be32 new, __wsum oldsum) 1333 { 1334 __be32 diff[2] = { ~old, new }; 1335 1336 return csum_partial(diff, sizeof(diff), oldsum); 1337 } 1338 1339 #ifdef CONFIG_IP_VS_IPV6 1340 static inline __wsum ip_vs_check_diff16(const __be32 *old, const __be32 *new, 1341 __wsum oldsum) 1342 { 1343 __be32 diff[8] = { ~old[3], ~old[2], ~old[1], ~old[0], 1344 new[3], new[2], new[1], new[0] }; 1345 1346 return csum_partial(diff, sizeof(diff), oldsum); 1347 } 1348 #endif 1349 1350 static inline __wsum ip_vs_check_diff2(__be16 old, __be16 new, __wsum oldsum) 1351 { 1352 __be16 diff[2] = { ~old, new }; 1353 1354 return csum_partial(diff, sizeof(diff), oldsum); 1355 } 1356 1357 /* 1358 * Forget current conntrack (unconfirmed) and attach notrack entry 1359 */ 1360 static inline void ip_vs_notrack(struct sk_buff *skb) 1361 { 1362 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) 1363 enum ip_conntrack_info ctinfo; 1364 struct nf_conn *ct = nf_ct_get(skb, &ctinfo); 1365 1366 if (!ct || !nf_ct_is_untracked(ct)) { 1367 nf_reset(skb); 1368 skb->nfct = &nf_ct_untracked_get()->ct_general; 1369 skb->nfctinfo = IP_CT_NEW; 1370 nf_conntrack_get(skb->nfct); 1371 } 1372 #endif 1373 } 1374 1375 #ifdef CONFIG_IP_VS_NFCT 1376 /* 1377 * Netfilter connection tracking 1378 * (from ip_vs_nfct.c) 1379 */ 1380 static inline int ip_vs_conntrack_enabled(struct netns_ipvs *ipvs) 1381 { 1382 #ifdef CONFIG_SYSCTL 1383 return ipvs->sysctl_conntrack; 1384 #else 1385 return 0; 1386 #endif 1387 } 1388 1389 extern void ip_vs_update_conntrack(struct sk_buff *skb, struct ip_vs_conn *cp, 1390 int outin); 1391 extern int ip_vs_confirm_conntrack(struct sk_buff *skb, struct ip_vs_conn *cp); 1392 extern void ip_vs_nfct_expect_related(struct sk_buff *skb, struct nf_conn *ct, 1393 struct ip_vs_conn *cp, u_int8_t proto, 1394 const __be16 port, int from_rs); 1395 extern void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp); 1396 1397 #else 1398 1399 static inline int ip_vs_conntrack_enabled(struct netns_ipvs *ipvs) 1400 { 1401 return 0; 1402 } 1403 1404 static inline void ip_vs_update_conntrack(struct sk_buff *skb, 1405 struct ip_vs_conn *cp, int outin) 1406 { 1407 } 1408 1409 static inline int ip_vs_confirm_conntrack(struct sk_buff *skb, 1410 struct ip_vs_conn *cp) 1411 { 1412 return NF_ACCEPT; 1413 } 1414 1415 static inline void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp) 1416 { 1417 } 1418 /* CONFIG_IP_VS_NFCT */ 1419 #endif 1420 1421 static inline unsigned int 1422 ip_vs_dest_conn_overhead(struct ip_vs_dest *dest) 1423 { 1424 /* 1425 * We think the overhead of processing active connections is 256 1426 * times higher than that of inactive connections in average. (This 1427 * 256 times might not be accurate, we will change it later) We 1428 * use the following formula to estimate the overhead now: 1429 * dest->activeconns*256 + dest->inactconns 1430 */ 1431 return (atomic_read(&dest->activeconns) << 8) + 1432 atomic_read(&dest->inactconns); 1433 } 1434 1435 #endif /* __KERNEL__ */ 1436 1437 #endif /* _NET_IP_VS_H */ 1438