1/* IP Virtual Server 2 * data structure and functionality definitions 3 */ 4 5#ifndef _NET_IP_VS_H 6#define _NET_IP_VS_H 7 8#include <linux/ip_vs.h> /* definitions shared with userland */ 9 10#include <asm/types.h> /* for __uXX types */ 11 12#include <linux/list.h> /* for struct list_head */ 13#include <linux/spinlock.h> /* for struct rwlock_t */ 14#include <linux/atomic.h> /* for struct atomic_t */ 15#include <linux/compiler.h> 16#include <linux/timer.h> 17#include <linux/bug.h> 18 19#include <net/checksum.h> 20#include <linux/netfilter.h> /* for union nf_inet_addr */ 21#include <linux/ip.h> 22#include <linux/ipv6.h> /* for struct ipv6hdr */ 23#include <net/ipv6.h> 24#if IS_ENABLED(CONFIG_IP_VS_IPV6) 25#include <linux/netfilter_ipv6/ip6_tables.h> 26#endif 27#if IS_ENABLED(CONFIG_NF_CONNTRACK) 28#include <net/netfilter/nf_conntrack.h> 29#endif 30#include <net/net_namespace.h> /* Netw namespace */ 31 32#define IP_VS_HDR_INVERSE 1 33#define IP_VS_HDR_ICMP 2 34 35/* Generic access of ipvs struct */ 36static inline struct netns_ipvs *net_ipvs(struct net* net) 37{ 38 return net->ipvs; 39} 40 41/* This one needed for single_open_net since net is stored directly in 42 * private not as a struct i.e. seq_file_net can't be used. 43 */ 44static inline struct net *seq_file_single_net(struct seq_file *seq) 45{ 46#ifdef CONFIG_NET_NS 47 return (struct net *)seq->private; 48#else 49 return &init_net; 50#endif 51} 52 53/* Connections' size value needed by ip_vs_ctl.c */ 54extern int ip_vs_conn_tab_size; 55 56struct ip_vs_iphdr { 57 int hdr_flags; /* ipvs flags */ 58 __u32 off; /* Where IP or IPv4 header starts */ 59 __u32 len; /* IPv4 simply where L4 starts 60 * IPv6 where L4 Transport Header starts */ 61 __u16 fragoffs; /* IPv6 fragment offset, 0 if first frag (or not frag)*/ 62 __s16 protocol; 63 __s32 flags; 64 union nf_inet_addr saddr; 65 union nf_inet_addr daddr; 66}; 67 68static inline void *frag_safe_skb_hp(const struct sk_buff *skb, int offset, 69 int len, void *buffer, 70 const struct ip_vs_iphdr *ipvsh) 71{ 72 return skb_header_pointer(skb, offset, len, buffer); 73} 74 75/* This function handles filling *ip_vs_iphdr, both for IPv4 and IPv6. 76 * IPv6 requires some extra work, as finding proper header position, 77 * depend on the IPv6 extension headers. 78 */ 79static inline int 80ip_vs_fill_iph_skb_off(int af, const struct sk_buff *skb, int offset, 81 int hdr_flags, struct ip_vs_iphdr *iphdr) 82{ 83 iphdr->hdr_flags = hdr_flags; 84 iphdr->off = offset; 85 86#ifdef CONFIG_IP_VS_IPV6 87 if (af == AF_INET6) { 88 struct ipv6hdr _iph; 89 const struct ipv6hdr *iph = skb_header_pointer( 90 skb, offset, sizeof(_iph), &_iph); 91 if (!iph) 92 return 0; 93 94 iphdr->saddr.in6 = iph->saddr; 95 iphdr->daddr.in6 = iph->daddr; 96 /* ipv6_find_hdr() updates len, flags */ 97 iphdr->len = offset; 98 iphdr->flags = 0; 99 iphdr->protocol = ipv6_find_hdr(skb, &iphdr->len, -1, 100 &iphdr->fragoffs, 101 &iphdr->flags); 102 if (iphdr->protocol < 0) 103 return 0; 104 } else 105#endif 106 { 107 struct iphdr _iph; 108 const struct iphdr *iph = skb_header_pointer( 109 skb, offset, sizeof(_iph), &_iph); 110 if (!iph) 111 return 0; 112 113 iphdr->len = offset + iph->ihl * 4; 114 iphdr->fragoffs = 0; 115 iphdr->protocol = iph->protocol; 116 iphdr->saddr.ip = iph->saddr; 117 iphdr->daddr.ip = iph->daddr; 118 } 119 120 return 1; 121} 122 123static inline int 124ip_vs_fill_iph_skb_icmp(int af, const struct sk_buff *skb, int offset, 125 bool inverse, struct ip_vs_iphdr *iphdr) 126{ 127 int hdr_flags = IP_VS_HDR_ICMP; 128 129 if (inverse) 130 hdr_flags |= IP_VS_HDR_INVERSE; 131 132 return ip_vs_fill_iph_skb_off(af, skb, offset, hdr_flags, iphdr); 133} 134 135static inline int 136ip_vs_fill_iph_skb(int af, const struct sk_buff *skb, bool inverse, 137 struct ip_vs_iphdr *iphdr) 138{ 139 int hdr_flags = 0; 140 141 if (inverse) 142 hdr_flags |= IP_VS_HDR_INVERSE; 143 144 return ip_vs_fill_iph_skb_off(af, skb, skb_network_offset(skb), 145 hdr_flags, iphdr); 146} 147 148static inline bool 149ip_vs_iph_inverse(const struct ip_vs_iphdr *iph) 150{ 151 return !!(iph->hdr_flags & IP_VS_HDR_INVERSE); 152} 153 154static inline bool 155ip_vs_iph_icmp(const struct ip_vs_iphdr *iph) 156{ 157 return !!(iph->hdr_flags & IP_VS_HDR_ICMP); 158} 159 160static inline void ip_vs_addr_copy(int af, union nf_inet_addr *dst, 161 const union nf_inet_addr *src) 162{ 163#ifdef CONFIG_IP_VS_IPV6 164 if (af == AF_INET6) 165 dst->in6 = src->in6; 166 else 167#endif 168 dst->ip = src->ip; 169} 170 171static inline void ip_vs_addr_set(int af, union nf_inet_addr *dst, 172 const union nf_inet_addr *src) 173{ 174#ifdef CONFIG_IP_VS_IPV6 175 if (af == AF_INET6) { 176 dst->in6 = src->in6; 177 return; 178 } 179#endif 180 dst->ip = src->ip; 181 dst->all[1] = 0; 182 dst->all[2] = 0; 183 dst->all[3] = 0; 184} 185 186static inline int ip_vs_addr_equal(int af, const union nf_inet_addr *a, 187 const union nf_inet_addr *b) 188{ 189#ifdef CONFIG_IP_VS_IPV6 190 if (af == AF_INET6) 191 return ipv6_addr_equal(&a->in6, &b->in6); 192#endif 193 return a->ip == b->ip; 194} 195 196#ifdef CONFIG_IP_VS_DEBUG 197#include <linux/net.h> 198 199int ip_vs_get_debug_level(void); 200 201static inline const char *ip_vs_dbg_addr(int af, char *buf, size_t buf_len, 202 const union nf_inet_addr *addr, 203 int *idx) 204{ 205 int len; 206#ifdef CONFIG_IP_VS_IPV6 207 if (af == AF_INET6) 208 len = snprintf(&buf[*idx], buf_len - *idx, "[%pI6c]", 209 &addr->in6) + 1; 210 else 211#endif 212 len = snprintf(&buf[*idx], buf_len - *idx, "%pI4", 213 &addr->ip) + 1; 214 215 *idx += len; 216 BUG_ON(*idx > buf_len + 1); 217 return &buf[*idx - len]; 218} 219 220#define IP_VS_DBG_BUF(level, msg, ...) \ 221 do { \ 222 char ip_vs_dbg_buf[160]; \ 223 int ip_vs_dbg_idx = 0; \ 224 if (level <= ip_vs_get_debug_level()) \ 225 printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \ 226 } while (0) 227#define IP_VS_ERR_BUF(msg...) \ 228 do { \ 229 char ip_vs_dbg_buf[160]; \ 230 int ip_vs_dbg_idx = 0; \ 231 pr_err(msg); \ 232 } while (0) 233 234/* Only use from within IP_VS_DBG_BUF() or IP_VS_ERR_BUF macros */ 235#define IP_VS_DBG_ADDR(af, addr) \ 236 ip_vs_dbg_addr(af, ip_vs_dbg_buf, \ 237 sizeof(ip_vs_dbg_buf), addr, \ 238 &ip_vs_dbg_idx) 239 240#define IP_VS_DBG(level, msg, ...) \ 241 do { \ 242 if (level <= ip_vs_get_debug_level()) \ 243 printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \ 244 } while (0) 245#define IP_VS_DBG_RL(msg, ...) \ 246 do { \ 247 if (net_ratelimit()) \ 248 printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \ 249 } while (0) 250#define IP_VS_DBG_PKT(level, af, pp, skb, ofs, msg) \ 251 do { \ 252 if (level <= ip_vs_get_debug_level()) \ 253 pp->debug_packet(af, pp, skb, ofs, msg); \ 254 } while (0) 255#define IP_VS_DBG_RL_PKT(level, af, pp, skb, ofs, msg) \ 256 do { \ 257 if (level <= ip_vs_get_debug_level() && \ 258 net_ratelimit()) \ 259 pp->debug_packet(af, pp, skb, ofs, msg); \ 260 } while (0) 261#else /* NO DEBUGGING at ALL */ 262#define IP_VS_DBG_BUF(level, msg...) do {} while (0) 263#define IP_VS_ERR_BUF(msg...) do {} while (0) 264#define IP_VS_DBG(level, msg...) do {} while (0) 265#define IP_VS_DBG_RL(msg...) do {} while (0) 266#define IP_VS_DBG_PKT(level, af, pp, skb, ofs, msg) do {} while (0) 267#define IP_VS_DBG_RL_PKT(level, af, pp, skb, ofs, msg) do {} while (0) 268#endif 269 270#define IP_VS_BUG() BUG() 271#define IP_VS_ERR_RL(msg, ...) \ 272 do { \ 273 if (net_ratelimit()) \ 274 pr_err(msg, ##__VA_ARGS__); \ 275 } while (0) 276 277#ifdef CONFIG_IP_VS_DEBUG 278#define EnterFunction(level) \ 279 do { \ 280 if (level <= ip_vs_get_debug_level()) \ 281 printk(KERN_DEBUG \ 282 pr_fmt("Enter: %s, %s line %i\n"), \ 283 __func__, __FILE__, __LINE__); \ 284 } while (0) 285#define LeaveFunction(level) \ 286 do { \ 287 if (level <= ip_vs_get_debug_level()) \ 288 printk(KERN_DEBUG \ 289 pr_fmt("Leave: %s, %s line %i\n"), \ 290 __func__, __FILE__, __LINE__); \ 291 } while (0) 292#else 293#define EnterFunction(level) do {} while (0) 294#define LeaveFunction(level) do {} while (0) 295#endif 296 297/* The port number of FTP service (in network order). */ 298#define FTPPORT cpu_to_be16(21) 299#define FTPDATA cpu_to_be16(20) 300 301/* TCP State Values */ 302enum { 303 IP_VS_TCP_S_NONE = 0, 304 IP_VS_TCP_S_ESTABLISHED, 305 IP_VS_TCP_S_SYN_SENT, 306 IP_VS_TCP_S_SYN_RECV, 307 IP_VS_TCP_S_FIN_WAIT, 308 IP_VS_TCP_S_TIME_WAIT, 309 IP_VS_TCP_S_CLOSE, 310 IP_VS_TCP_S_CLOSE_WAIT, 311 IP_VS_TCP_S_LAST_ACK, 312 IP_VS_TCP_S_LISTEN, 313 IP_VS_TCP_S_SYNACK, 314 IP_VS_TCP_S_LAST 315}; 316 317/* UDP State Values */ 318enum { 319 IP_VS_UDP_S_NORMAL, 320 IP_VS_UDP_S_LAST, 321}; 322 323/* ICMP State Values */ 324enum { 325 IP_VS_ICMP_S_NORMAL, 326 IP_VS_ICMP_S_LAST, 327}; 328 329/* SCTP State Values */ 330enum ip_vs_sctp_states { 331 IP_VS_SCTP_S_NONE, 332 IP_VS_SCTP_S_INIT1, 333 IP_VS_SCTP_S_INIT, 334 IP_VS_SCTP_S_COOKIE_SENT, 335 IP_VS_SCTP_S_COOKIE_REPLIED, 336 IP_VS_SCTP_S_COOKIE_WAIT, 337 IP_VS_SCTP_S_COOKIE, 338 IP_VS_SCTP_S_COOKIE_ECHOED, 339 IP_VS_SCTP_S_ESTABLISHED, 340 IP_VS_SCTP_S_SHUTDOWN_SENT, 341 IP_VS_SCTP_S_SHUTDOWN_RECEIVED, 342 IP_VS_SCTP_S_SHUTDOWN_ACK_SENT, 343 IP_VS_SCTP_S_REJECTED, 344 IP_VS_SCTP_S_CLOSED, 345 IP_VS_SCTP_S_LAST 346}; 347 348/* Delta sequence info structure 349 * Each ip_vs_conn has 2 (output AND input seq. changes). 350 * Only used in the VS/NAT. 351 */ 352struct ip_vs_seq { 353 __u32 init_seq; /* Add delta from this seq */ 354 __u32 delta; /* Delta in sequence numbers */ 355 __u32 previous_delta; /* Delta in sequence numbers 356 * before last resized pkt */ 357}; 358 359/* counters per cpu */ 360struct ip_vs_counters { 361 __u64 conns; /* connections scheduled */ 362 __u64 inpkts; /* incoming packets */ 363 __u64 outpkts; /* outgoing packets */ 364 __u64 inbytes; /* incoming bytes */ 365 __u64 outbytes; /* outgoing bytes */ 366}; 367/* Stats per cpu */ 368struct ip_vs_cpu_stats { 369 struct ip_vs_counters cnt; 370 struct u64_stats_sync syncp; 371}; 372 373/* IPVS statistics objects */ 374struct ip_vs_estimator { 375 struct list_head list; 376 377 u64 last_inbytes; 378 u64 last_outbytes; 379 u64 last_conns; 380 u64 last_inpkts; 381 u64 last_outpkts; 382 383 u64 cps; 384 u64 inpps; 385 u64 outpps; 386 u64 inbps; 387 u64 outbps; 388}; 389 390/* 391 * IPVS statistics object, 64-bit kernel version of struct ip_vs_stats_user 392 */ 393struct ip_vs_kstats { 394 u64 conns; /* connections scheduled */ 395 u64 inpkts; /* incoming packets */ 396 u64 outpkts; /* outgoing packets */ 397 u64 inbytes; /* incoming bytes */ 398 u64 outbytes; /* outgoing bytes */ 399 400 u64 cps; /* current connection rate */ 401 u64 inpps; /* current in packet rate */ 402 u64 outpps; /* current out packet rate */ 403 u64 inbps; /* current in byte rate */ 404 u64 outbps; /* current out byte rate */ 405}; 406 407struct ip_vs_stats { 408 struct ip_vs_kstats kstats; /* kernel statistics */ 409 struct ip_vs_estimator est; /* estimator */ 410 struct ip_vs_cpu_stats __percpu *cpustats; /* per cpu counters */ 411 spinlock_t lock; /* spin lock */ 412 struct ip_vs_kstats kstats0; /* reset values */ 413}; 414 415struct dst_entry; 416struct iphdr; 417struct ip_vs_conn; 418struct ip_vs_app; 419struct sk_buff; 420struct ip_vs_proto_data; 421 422struct ip_vs_protocol { 423 struct ip_vs_protocol *next; 424 char *name; 425 u16 protocol; 426 u16 num_states; 427 int dont_defrag; 428 429 void (*init)(struct ip_vs_protocol *pp); 430 431 void (*exit)(struct ip_vs_protocol *pp); 432 433 int (*init_netns)(struct netns_ipvs *ipvs, struct ip_vs_proto_data *pd); 434 435 void (*exit_netns)(struct netns_ipvs *ipvs, struct ip_vs_proto_data *pd); 436 437 int (*conn_schedule)(struct netns_ipvs *ipvs, 438 int af, struct sk_buff *skb, 439 struct ip_vs_proto_data *pd, 440 int *verdict, struct ip_vs_conn **cpp, 441 struct ip_vs_iphdr *iph); 442 443 struct ip_vs_conn * 444 (*conn_in_get)(struct netns_ipvs *ipvs, 445 int af, 446 const struct sk_buff *skb, 447 const struct ip_vs_iphdr *iph); 448 449 struct ip_vs_conn * 450 (*conn_out_get)(struct netns_ipvs *ipvs, 451 int af, 452 const struct sk_buff *skb, 453 const struct ip_vs_iphdr *iph); 454 455 int (*snat_handler)(struct sk_buff *skb, struct ip_vs_protocol *pp, 456 struct ip_vs_conn *cp, struct ip_vs_iphdr *iph); 457 458 int (*dnat_handler)(struct sk_buff *skb, struct ip_vs_protocol *pp, 459 struct ip_vs_conn *cp, struct ip_vs_iphdr *iph); 460 461 int (*csum_check)(int af, struct sk_buff *skb, 462 struct ip_vs_protocol *pp); 463 464 const char *(*state_name)(int state); 465 466 void (*state_transition)(struct ip_vs_conn *cp, int direction, 467 const struct sk_buff *skb, 468 struct ip_vs_proto_data *pd); 469 470 int (*register_app)(struct netns_ipvs *ipvs, struct ip_vs_app *inc); 471 472 void (*unregister_app)(struct netns_ipvs *ipvs, struct ip_vs_app *inc); 473 474 int (*app_conn_bind)(struct ip_vs_conn *cp); 475 476 void (*debug_packet)(int af, struct ip_vs_protocol *pp, 477 const struct sk_buff *skb, 478 int offset, 479 const char *msg); 480 481 void (*timeout_change)(struct ip_vs_proto_data *pd, int flags); 482}; 483 484/* protocol data per netns */ 485struct ip_vs_proto_data { 486 struct ip_vs_proto_data *next; 487 struct ip_vs_protocol *pp; 488 int *timeout_table; /* protocol timeout table */ 489 atomic_t appcnt; /* counter of proto app incs. */ 490 struct tcp_states_t *tcp_state_table; 491}; 492 493struct ip_vs_protocol *ip_vs_proto_get(unsigned short proto); 494struct ip_vs_proto_data *ip_vs_proto_data_get(struct netns_ipvs *ipvs, 495 unsigned short proto); 496 497struct ip_vs_conn_param { 498 struct netns_ipvs *ipvs; 499 const union nf_inet_addr *caddr; 500 const union nf_inet_addr *vaddr; 501 __be16 cport; 502 __be16 vport; 503 __u16 protocol; 504 u16 af; 505 506 const struct ip_vs_pe *pe; 507 char *pe_data; 508 __u8 pe_data_len; 509}; 510 511/* IP_VS structure allocated for each dynamically scheduled connection */ 512struct ip_vs_conn { 513 struct hlist_node c_list; /* hashed list heads */ 514 /* Protocol, addresses and port numbers */ 515 __be16 cport; 516 __be16 dport; 517 __be16 vport; 518 u16 af; /* address family */ 519 union nf_inet_addr caddr; /* client address */ 520 union nf_inet_addr vaddr; /* virtual address */ 521 union nf_inet_addr daddr; /* destination address */ 522 volatile __u32 flags; /* status flags */ 523 __u16 protocol; /* Which protocol (TCP/UDP) */ 524 __u16 daf; /* Address family of the dest */ 525 struct netns_ipvs *ipvs; 526 527 /* counter and timer */ 528 atomic_t refcnt; /* reference count */ 529 struct timer_list timer; /* Expiration timer */ 530 volatile unsigned long timeout; /* timeout */ 531 532 /* Flags and state transition */ 533 spinlock_t lock; /* lock for state transition */ 534 volatile __u16 state; /* state info */ 535 volatile __u16 old_state; /* old state, to be used for 536 * state transition triggerd 537 * synchronization 538 */ 539 __u32 fwmark; /* Fire wall mark from skb */ 540 unsigned long sync_endtime; /* jiffies + sent_retries */ 541 542 /* Control members */ 543 struct ip_vs_conn *control; /* Master control connection */ 544 atomic_t n_control; /* Number of controlled ones */ 545 struct ip_vs_dest *dest; /* real server */ 546 atomic_t in_pkts; /* incoming packet counter */ 547 548 /* Packet transmitter for different forwarding methods. If it 549 * mangles the packet, it must return NF_DROP or better NF_STOLEN, 550 * otherwise this must be changed to a sk_buff **. 551 * NF_ACCEPT can be returned when destination is local. 552 */ 553 int (*packet_xmit)(struct sk_buff *skb, struct ip_vs_conn *cp, 554 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph); 555 556 /* Note: we can group the following members into a structure, 557 * in order to save more space, and the following members are 558 * only used in VS/NAT anyway 559 */ 560 struct ip_vs_app *app; /* bound ip_vs_app object */ 561 void *app_data; /* Application private data */ 562 struct ip_vs_seq in_seq; /* incoming seq. struct */ 563 struct ip_vs_seq out_seq; /* outgoing seq. struct */ 564 565 const struct ip_vs_pe *pe; 566 char *pe_data; 567 __u8 pe_data_len; 568 569 struct rcu_head rcu_head; 570}; 571 572/* Extended internal versions of struct ip_vs_service_user and ip_vs_dest_user 573 * for IPv6 support. 574 * 575 * We need these to conveniently pass around service and destination 576 * options, but unfortunately, we also need to keep the old definitions to 577 * maintain userspace backwards compatibility for the setsockopt interface. 578 */ 579struct ip_vs_service_user_kern { 580 /* virtual service addresses */ 581 u16 af; 582 u16 protocol; 583 union nf_inet_addr addr; /* virtual ip address */ 584 __be16 port; 585 u32 fwmark; /* firwall mark of service */ 586 587 /* virtual service options */ 588 char *sched_name; 589 char *pe_name; 590 unsigned int flags; /* virtual service flags */ 591 unsigned int timeout; /* persistent timeout in sec */ 592 __be32 netmask; /* persistent netmask or plen */ 593}; 594 595 596struct ip_vs_dest_user_kern { 597 /* destination server address */ 598 union nf_inet_addr addr; 599 __be16 port; 600 601 /* real server options */ 602 unsigned int conn_flags; /* connection flags */ 603 int weight; /* destination weight */ 604 605 /* thresholds for active connections */ 606 u32 u_threshold; /* upper threshold */ 607 u32 l_threshold; /* lower threshold */ 608 609 /* Address family of addr */ 610 u16 af; 611}; 612 613 614/* 615 * The information about the virtual service offered to the net and the 616 * forwarding entries. 617 */ 618struct ip_vs_service { 619 struct hlist_node s_list; /* for normal service table */ 620 struct hlist_node f_list; /* for fwmark-based service table */ 621 atomic_t refcnt; /* reference counter */ 622 623 u16 af; /* address family */ 624 __u16 protocol; /* which protocol (TCP/UDP) */ 625 union nf_inet_addr addr; /* IP address for virtual service */ 626 __be16 port; /* port number for the service */ 627 __u32 fwmark; /* firewall mark of the service */ 628 unsigned int flags; /* service status flags */ 629 unsigned int timeout; /* persistent timeout in ticks */ 630 __be32 netmask; /* grouping granularity, mask/plen */ 631 struct netns_ipvs *ipvs; 632 633 struct list_head destinations; /* real server d-linked list */ 634 __u32 num_dests; /* number of servers */ 635 struct ip_vs_stats stats; /* statistics for the service */ 636 637 /* for scheduling */ 638 struct ip_vs_scheduler __rcu *scheduler; /* bound scheduler object */ 639 spinlock_t sched_lock; /* lock sched_data */ 640 void *sched_data; /* scheduler application data */ 641 642 /* alternate persistence engine */ 643 struct ip_vs_pe __rcu *pe; 644 645 struct rcu_head rcu_head; 646}; 647 648/* Information for cached dst */ 649struct ip_vs_dest_dst { 650 struct dst_entry *dst_cache; /* destination cache entry */ 651 u32 dst_cookie; 652 union nf_inet_addr dst_saddr; 653 struct rcu_head rcu_head; 654}; 655 656/* The real server destination forwarding entry with ip address, port number, 657 * and so on. 658 */ 659struct ip_vs_dest { 660 struct list_head n_list; /* for the dests in the service */ 661 struct hlist_node d_list; /* for table with all the dests */ 662 663 u16 af; /* address family */ 664 __be16 port; /* port number of the server */ 665 union nf_inet_addr addr; /* IP address of the server */ 666 volatile unsigned int flags; /* dest status flags */ 667 atomic_t conn_flags; /* flags to copy to conn */ 668 atomic_t weight; /* server weight */ 669 670 atomic_t refcnt; /* reference counter */ 671 struct ip_vs_stats stats; /* statistics */ 672 unsigned long idle_start; /* start time, jiffies */ 673 674 /* connection counters and thresholds */ 675 atomic_t activeconns; /* active connections */ 676 atomic_t inactconns; /* inactive connections */ 677 atomic_t persistconns; /* persistent connections */ 678 __u32 u_threshold; /* upper threshold */ 679 __u32 l_threshold; /* lower threshold */ 680 681 /* for destination cache */ 682 spinlock_t dst_lock; /* lock of dst_cache */ 683 struct ip_vs_dest_dst __rcu *dest_dst; /* cached dst info */ 684 685 /* for virtual service */ 686 struct ip_vs_service __rcu *svc; /* service it belongs to */ 687 __u16 protocol; /* which protocol (TCP/UDP) */ 688 __be16 vport; /* virtual port number */ 689 union nf_inet_addr vaddr; /* virtual IP address */ 690 __u32 vfwmark; /* firewall mark of service */ 691 692 struct list_head t_list; /* in dest_trash */ 693 unsigned int in_rs_table:1; /* we are in rs_table */ 694}; 695 696/* The scheduler object */ 697struct ip_vs_scheduler { 698 struct list_head n_list; /* d-linked list head */ 699 char *name; /* scheduler name */ 700 atomic_t refcnt; /* reference counter */ 701 struct module *module; /* THIS_MODULE/NULL */ 702 703 /* scheduler initializing service */ 704 int (*init_service)(struct ip_vs_service *svc); 705 /* scheduling service finish */ 706 void (*done_service)(struct ip_vs_service *svc); 707 /* dest is linked */ 708 int (*add_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest); 709 /* dest is unlinked */ 710 int (*del_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest); 711 /* dest is updated */ 712 int (*upd_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest); 713 714 /* selecting a server from the given service */ 715 struct ip_vs_dest* (*schedule)(struct ip_vs_service *svc, 716 const struct sk_buff *skb, 717 struct ip_vs_iphdr *iph); 718}; 719 720/* The persistence engine object */ 721struct ip_vs_pe { 722 struct list_head n_list; /* d-linked list head */ 723 char *name; /* scheduler name */ 724 atomic_t refcnt; /* reference counter */ 725 struct module *module; /* THIS_MODULE/NULL */ 726 727 /* get the connection template, if any */ 728 int (*fill_param)(struct ip_vs_conn_param *p, struct sk_buff *skb); 729 bool (*ct_match)(const struct ip_vs_conn_param *p, 730 struct ip_vs_conn *ct); 731 u32 (*hashkey_raw)(const struct ip_vs_conn_param *p, u32 initval, 732 bool inverse); 733 int (*show_pe_data)(const struct ip_vs_conn *cp, char *buf); 734}; 735 736/* The application module object (a.k.a. app incarnation) */ 737struct ip_vs_app { 738 struct list_head a_list; /* member in app list */ 739 int type; /* IP_VS_APP_TYPE_xxx */ 740 char *name; /* application module name */ 741 __u16 protocol; 742 struct module *module; /* THIS_MODULE/NULL */ 743 struct list_head incs_list; /* list of incarnations */ 744 745 /* members for application incarnations */ 746 struct list_head p_list; /* member in proto app list */ 747 struct ip_vs_app *app; /* its real application */ 748 __be16 port; /* port number in net order */ 749 atomic_t usecnt; /* usage counter */ 750 struct rcu_head rcu_head; 751 752 /* output hook: Process packet in inout direction, diff set for TCP. 753 * Return: 0=Error, 1=Payload Not Mangled/Mangled but checksum is ok, 754 * 2=Mangled but checksum was not updated 755 */ 756 int (*pkt_out)(struct ip_vs_app *, struct ip_vs_conn *, 757 struct sk_buff *, int *diff); 758 759 /* input hook: Process packet in outin direction, diff set for TCP. 760 * Return: 0=Error, 1=Payload Not Mangled/Mangled but checksum is ok, 761 * 2=Mangled but checksum was not updated 762 */ 763 int (*pkt_in)(struct ip_vs_app *, struct ip_vs_conn *, 764 struct sk_buff *, int *diff); 765 766 /* ip_vs_app initializer */ 767 int (*init_conn)(struct ip_vs_app *, struct ip_vs_conn *); 768 769 /* ip_vs_app finish */ 770 int (*done_conn)(struct ip_vs_app *, struct ip_vs_conn *); 771 772 773 /* not used now */ 774 int (*bind_conn)(struct ip_vs_app *, struct ip_vs_conn *, 775 struct ip_vs_protocol *); 776 777 void (*unbind_conn)(struct ip_vs_app *, struct ip_vs_conn *); 778 779 int * timeout_table; 780 int * timeouts; 781 int timeouts_size; 782 783 int (*conn_schedule)(struct sk_buff *skb, struct ip_vs_app *app, 784 int *verdict, struct ip_vs_conn **cpp); 785 786 struct ip_vs_conn * 787 (*conn_in_get)(const struct sk_buff *skb, struct ip_vs_app *app, 788 const struct iphdr *iph, int inverse); 789 790 struct ip_vs_conn * 791 (*conn_out_get)(const struct sk_buff *skb, struct ip_vs_app *app, 792 const struct iphdr *iph, int inverse); 793 794 int (*state_transition)(struct ip_vs_conn *cp, int direction, 795 const struct sk_buff *skb, 796 struct ip_vs_app *app); 797 798 void (*timeout_change)(struct ip_vs_app *app, int flags); 799}; 800 801struct ipvs_master_sync_state { 802 struct list_head sync_queue; 803 struct ip_vs_sync_buff *sync_buff; 804 unsigned long sync_queue_len; 805 unsigned int sync_queue_delay; 806 struct task_struct *master_thread; 807 struct delayed_work master_wakeup_work; 808 struct netns_ipvs *ipvs; 809}; 810 811/* How much time to keep dests in trash */ 812#define IP_VS_DEST_TRASH_PERIOD (120 * HZ) 813 814struct ipvs_sync_daemon_cfg { 815 union nf_inet_addr mcast_group; 816 int syncid; 817 u16 sync_maxlen; 818 u16 mcast_port; 819 u8 mcast_af; 820 u8 mcast_ttl; 821 /* multicast interface name */ 822 char mcast_ifn[IP_VS_IFNAME_MAXLEN]; 823}; 824 825/* IPVS in network namespace */ 826struct netns_ipvs { 827 int gen; /* Generation */ 828 int enable; /* enable like nf_hooks do */ 829 /* Hash table: for real service lookups */ 830 #define IP_VS_RTAB_BITS 4 831 #define IP_VS_RTAB_SIZE (1 << IP_VS_RTAB_BITS) 832 #define IP_VS_RTAB_MASK (IP_VS_RTAB_SIZE - 1) 833 834 struct hlist_head rs_table[IP_VS_RTAB_SIZE]; 835 /* ip_vs_app */ 836 struct list_head app_list; 837 /* ip_vs_proto */ 838 #define IP_VS_PROTO_TAB_SIZE 32 /* must be power of 2 */ 839 struct ip_vs_proto_data *proto_data_table[IP_VS_PROTO_TAB_SIZE]; 840 /* ip_vs_proto_tcp */ 841#ifdef CONFIG_IP_VS_PROTO_TCP 842 #define TCP_APP_TAB_BITS 4 843 #define TCP_APP_TAB_SIZE (1 << TCP_APP_TAB_BITS) 844 #define TCP_APP_TAB_MASK (TCP_APP_TAB_SIZE - 1) 845 struct list_head tcp_apps[TCP_APP_TAB_SIZE]; 846#endif 847 /* ip_vs_proto_udp */ 848#ifdef CONFIG_IP_VS_PROTO_UDP 849 #define UDP_APP_TAB_BITS 4 850 #define UDP_APP_TAB_SIZE (1 << UDP_APP_TAB_BITS) 851 #define UDP_APP_TAB_MASK (UDP_APP_TAB_SIZE - 1) 852 struct list_head udp_apps[UDP_APP_TAB_SIZE]; 853#endif 854 /* ip_vs_proto_sctp */ 855#ifdef CONFIG_IP_VS_PROTO_SCTP 856 #define SCTP_APP_TAB_BITS 4 857 #define SCTP_APP_TAB_SIZE (1 << SCTP_APP_TAB_BITS) 858 #define SCTP_APP_TAB_MASK (SCTP_APP_TAB_SIZE - 1) 859 /* Hash table for SCTP application incarnations */ 860 struct list_head sctp_apps[SCTP_APP_TAB_SIZE]; 861#endif 862 /* ip_vs_conn */ 863 atomic_t conn_count; /* connection counter */ 864 865 /* ip_vs_ctl */ 866 struct ip_vs_stats tot_stats; /* Statistics & est. */ 867 868 int num_services; /* no of virtual services */ 869 870 /* Trash for destinations */ 871 struct list_head dest_trash; 872 spinlock_t dest_trash_lock; 873 struct timer_list dest_trash_timer; /* expiration timer */ 874 /* Service counters */ 875 atomic_t ftpsvc_counter; 876 atomic_t nullsvc_counter; 877 878#ifdef CONFIG_SYSCTL 879 /* 1/rate drop and drop-entry variables */ 880 struct delayed_work defense_work; /* Work handler */ 881 int drop_rate; 882 int drop_counter; 883 atomic_t dropentry; 884 /* locks in ctl.c */ 885 spinlock_t dropentry_lock; /* drop entry handling */ 886 spinlock_t droppacket_lock; /* drop packet handling */ 887 spinlock_t securetcp_lock; /* state and timeout tables */ 888 889 /* sys-ctl struct */ 890 struct ctl_table_header *sysctl_hdr; 891 struct ctl_table *sysctl_tbl; 892#endif 893 894 /* sysctl variables */ 895 int sysctl_amemthresh; 896 int sysctl_am_droprate; 897 int sysctl_drop_entry; 898 int sysctl_drop_packet; 899 int sysctl_secure_tcp; 900#ifdef CONFIG_IP_VS_NFCT 901 int sysctl_conntrack; 902#endif 903 int sysctl_snat_reroute; 904 int sysctl_sync_ver; 905 int sysctl_sync_ports; 906 int sysctl_sync_persist_mode; 907 unsigned long sysctl_sync_qlen_max; 908 int sysctl_sync_sock_size; 909 int sysctl_cache_bypass; 910 int sysctl_expire_nodest_conn; 911 int sysctl_sloppy_tcp; 912 int sysctl_sloppy_sctp; 913 int sysctl_expire_quiescent_template; 914 int sysctl_sync_threshold[2]; 915 unsigned int sysctl_sync_refresh_period; 916 int sysctl_sync_retries; 917 int sysctl_nat_icmp_send; 918 int sysctl_pmtu_disc; 919 int sysctl_backup_only; 920 int sysctl_conn_reuse_mode; 921 int sysctl_schedule_icmp; 922 int sysctl_ignore_tunneled; 923 924 /* ip_vs_lblc */ 925 int sysctl_lblc_expiration; 926 struct ctl_table_header *lblc_ctl_header; 927 struct ctl_table *lblc_ctl_table; 928 /* ip_vs_lblcr */ 929 int sysctl_lblcr_expiration; 930 struct ctl_table_header *lblcr_ctl_header; 931 struct ctl_table *lblcr_ctl_table; 932 /* ip_vs_est */ 933 struct list_head est_list; /* estimator list */ 934 spinlock_t est_lock; 935 struct timer_list est_timer; /* Estimation timer */ 936 /* ip_vs_sync */ 937 spinlock_t sync_lock; 938 struct ipvs_master_sync_state *ms; 939 spinlock_t sync_buff_lock; 940 struct task_struct **backup_threads; 941 int threads_mask; 942 volatile int sync_state; 943 struct mutex sync_mutex; 944 struct ipvs_sync_daemon_cfg mcfg; /* Master Configuration */ 945 struct ipvs_sync_daemon_cfg bcfg; /* Backup Configuration */ 946 /* net name space ptr */ 947 struct net *net; /* Needed by timer routines */ 948 /* Number of heterogeneous destinations, needed becaus heterogeneous 949 * are not supported when synchronization is enabled. 950 */ 951 unsigned int mixed_address_family_dests; 952}; 953 954#define DEFAULT_SYNC_THRESHOLD 3 955#define DEFAULT_SYNC_PERIOD 50 956#define DEFAULT_SYNC_VER 1 957#define DEFAULT_SLOPPY_TCP 0 958#define DEFAULT_SLOPPY_SCTP 0 959#define DEFAULT_SYNC_REFRESH_PERIOD (0U * HZ) 960#define DEFAULT_SYNC_RETRIES 0 961#define IPVS_SYNC_WAKEUP_RATE 8 962#define IPVS_SYNC_QLEN_MAX (IPVS_SYNC_WAKEUP_RATE * 4) 963#define IPVS_SYNC_SEND_DELAY (HZ / 50) 964#define IPVS_SYNC_CHECK_PERIOD HZ 965#define IPVS_SYNC_FLUSH_TIME (HZ * 2) 966#define IPVS_SYNC_PORTS_MAX (1 << 6) 967 968#ifdef CONFIG_SYSCTL 969 970static inline int sysctl_sync_threshold(struct netns_ipvs *ipvs) 971{ 972 return ipvs->sysctl_sync_threshold[0]; 973} 974 975static inline int sysctl_sync_period(struct netns_ipvs *ipvs) 976{ 977 return ACCESS_ONCE(ipvs->sysctl_sync_threshold[1]); 978} 979 980static inline unsigned int sysctl_sync_refresh_period(struct netns_ipvs *ipvs) 981{ 982 return ACCESS_ONCE(ipvs->sysctl_sync_refresh_period); 983} 984 985static inline int sysctl_sync_retries(struct netns_ipvs *ipvs) 986{ 987 return ipvs->sysctl_sync_retries; 988} 989 990static inline int sysctl_sync_ver(struct netns_ipvs *ipvs) 991{ 992 return ipvs->sysctl_sync_ver; 993} 994 995static inline int sysctl_sloppy_tcp(struct netns_ipvs *ipvs) 996{ 997 return ipvs->sysctl_sloppy_tcp; 998} 999 1000static inline int sysctl_sloppy_sctp(struct netns_ipvs *ipvs) 1001{ 1002 return ipvs->sysctl_sloppy_sctp; 1003} 1004 1005static inline int sysctl_sync_ports(struct netns_ipvs *ipvs) 1006{ 1007 return ACCESS_ONCE(ipvs->sysctl_sync_ports); 1008} 1009 1010static inline int sysctl_sync_persist_mode(struct netns_ipvs *ipvs) 1011{ 1012 return ipvs->sysctl_sync_persist_mode; 1013} 1014 1015static inline unsigned long sysctl_sync_qlen_max(struct netns_ipvs *ipvs) 1016{ 1017 return ipvs->sysctl_sync_qlen_max; 1018} 1019 1020static inline int sysctl_sync_sock_size(struct netns_ipvs *ipvs) 1021{ 1022 return ipvs->sysctl_sync_sock_size; 1023} 1024 1025static inline int sysctl_pmtu_disc(struct netns_ipvs *ipvs) 1026{ 1027 return ipvs->sysctl_pmtu_disc; 1028} 1029 1030static inline int sysctl_backup_only(struct netns_ipvs *ipvs) 1031{ 1032 return ipvs->sync_state & IP_VS_STATE_BACKUP && 1033 ipvs->sysctl_backup_only; 1034} 1035 1036static inline int sysctl_conn_reuse_mode(struct netns_ipvs *ipvs) 1037{ 1038 return ipvs->sysctl_conn_reuse_mode; 1039} 1040 1041static inline int sysctl_schedule_icmp(struct netns_ipvs *ipvs) 1042{ 1043 return ipvs->sysctl_schedule_icmp; 1044} 1045 1046static inline int sysctl_ignore_tunneled(struct netns_ipvs *ipvs) 1047{ 1048 return ipvs->sysctl_ignore_tunneled; 1049} 1050 1051static inline int sysctl_cache_bypass(struct netns_ipvs *ipvs) 1052{ 1053 return ipvs->sysctl_cache_bypass; 1054} 1055 1056#else 1057 1058static inline int sysctl_sync_threshold(struct netns_ipvs *ipvs) 1059{ 1060 return DEFAULT_SYNC_THRESHOLD; 1061} 1062 1063static inline int sysctl_sync_period(struct netns_ipvs *ipvs) 1064{ 1065 return DEFAULT_SYNC_PERIOD; 1066} 1067 1068static inline unsigned int sysctl_sync_refresh_period(struct netns_ipvs *ipvs) 1069{ 1070 return DEFAULT_SYNC_REFRESH_PERIOD; 1071} 1072 1073static inline int sysctl_sync_retries(struct netns_ipvs *ipvs) 1074{ 1075 return DEFAULT_SYNC_RETRIES & 3; 1076} 1077 1078static inline int sysctl_sync_ver(struct netns_ipvs *ipvs) 1079{ 1080 return DEFAULT_SYNC_VER; 1081} 1082 1083static inline int sysctl_sloppy_tcp(struct netns_ipvs *ipvs) 1084{ 1085 return DEFAULT_SLOPPY_TCP; 1086} 1087 1088static inline int sysctl_sloppy_sctp(struct netns_ipvs *ipvs) 1089{ 1090 return DEFAULT_SLOPPY_SCTP; 1091} 1092 1093static inline int sysctl_sync_ports(struct netns_ipvs *ipvs) 1094{ 1095 return 1; 1096} 1097 1098static inline int sysctl_sync_persist_mode(struct netns_ipvs *ipvs) 1099{ 1100 return 0; 1101} 1102 1103static inline unsigned long sysctl_sync_qlen_max(struct netns_ipvs *ipvs) 1104{ 1105 return IPVS_SYNC_QLEN_MAX; 1106} 1107 1108static inline int sysctl_sync_sock_size(struct netns_ipvs *ipvs) 1109{ 1110 return 0; 1111} 1112 1113static inline int sysctl_pmtu_disc(struct netns_ipvs *ipvs) 1114{ 1115 return 1; 1116} 1117 1118static inline int sysctl_backup_only(struct netns_ipvs *ipvs) 1119{ 1120 return 0; 1121} 1122 1123static inline int sysctl_conn_reuse_mode(struct netns_ipvs *ipvs) 1124{ 1125 return 1; 1126} 1127 1128static inline int sysctl_schedule_icmp(struct netns_ipvs *ipvs) 1129{ 1130 return 0; 1131} 1132 1133static inline int sysctl_ignore_tunneled(struct netns_ipvs *ipvs) 1134{ 1135 return 0; 1136} 1137 1138static inline int sysctl_cache_bypass(struct netns_ipvs *ipvs) 1139{ 1140 return 0; 1141} 1142 1143#endif 1144 1145/* IPVS core functions 1146 * (from ip_vs_core.c) 1147 */ 1148const char *ip_vs_proto_name(unsigned int proto); 1149void ip_vs_init_hash_table(struct list_head *table, int rows); 1150#define IP_VS_INIT_HASH_TABLE(t) ip_vs_init_hash_table((t), ARRAY_SIZE((t))) 1151 1152#define IP_VS_APP_TYPE_FTP 1 1153 1154/* ip_vs_conn handling functions 1155 * (from ip_vs_conn.c) 1156 */ 1157enum { 1158 IP_VS_DIR_INPUT = 0, 1159 IP_VS_DIR_OUTPUT, 1160 IP_VS_DIR_INPUT_ONLY, 1161 IP_VS_DIR_LAST, 1162}; 1163 1164static inline void ip_vs_conn_fill_param(struct netns_ipvs *ipvs, int af, int protocol, 1165 const union nf_inet_addr *caddr, 1166 __be16 cport, 1167 const union nf_inet_addr *vaddr, 1168 __be16 vport, 1169 struct ip_vs_conn_param *p) 1170{ 1171 p->ipvs = ipvs; 1172 p->af = af; 1173 p->protocol = protocol; 1174 p->caddr = caddr; 1175 p->cport = cport; 1176 p->vaddr = vaddr; 1177 p->vport = vport; 1178 p->pe = NULL; 1179 p->pe_data = NULL; 1180} 1181 1182struct ip_vs_conn *ip_vs_conn_in_get(const struct ip_vs_conn_param *p); 1183struct ip_vs_conn *ip_vs_ct_in_get(const struct ip_vs_conn_param *p); 1184 1185struct ip_vs_conn * ip_vs_conn_in_get_proto(struct netns_ipvs *ipvs, int af, 1186 const struct sk_buff *skb, 1187 const struct ip_vs_iphdr *iph); 1188 1189struct ip_vs_conn *ip_vs_conn_out_get(const struct ip_vs_conn_param *p); 1190 1191struct ip_vs_conn * ip_vs_conn_out_get_proto(struct netns_ipvs *ipvs, int af, 1192 const struct sk_buff *skb, 1193 const struct ip_vs_iphdr *iph); 1194 1195/* Get reference to gain full access to conn. 1196 * By default, RCU read-side critical sections have access only to 1197 * conn fields and its PE data, see ip_vs_conn_rcu_free() for reference. 1198 */ 1199static inline bool __ip_vs_conn_get(struct ip_vs_conn *cp) 1200{ 1201 return atomic_inc_not_zero(&cp->refcnt); 1202} 1203 1204/* put back the conn without restarting its timer */ 1205static inline void __ip_vs_conn_put(struct ip_vs_conn *cp) 1206{ 1207 smp_mb__before_atomic(); 1208 atomic_dec(&cp->refcnt); 1209} 1210void ip_vs_conn_put(struct ip_vs_conn *cp); 1211void ip_vs_conn_fill_cport(struct ip_vs_conn *cp, __be16 cport); 1212 1213struct ip_vs_conn *ip_vs_conn_new(const struct ip_vs_conn_param *p, int dest_af, 1214 const union nf_inet_addr *daddr, 1215 __be16 dport, unsigned int flags, 1216 struct ip_vs_dest *dest, __u32 fwmark); 1217void ip_vs_conn_expire_now(struct ip_vs_conn *cp); 1218 1219const char *ip_vs_state_name(__u16 proto, int state); 1220 1221void ip_vs_tcp_conn_listen(struct ip_vs_conn *cp); 1222int ip_vs_check_template(struct ip_vs_conn *ct); 1223void ip_vs_random_dropentry(struct netns_ipvs *ipvs); 1224int ip_vs_conn_init(void); 1225void ip_vs_conn_cleanup(void); 1226 1227static inline void ip_vs_control_del(struct ip_vs_conn *cp) 1228{ 1229 struct ip_vs_conn *ctl_cp = cp->control; 1230 if (!ctl_cp) { 1231 IP_VS_ERR_BUF("request control DEL for uncontrolled: " 1232 "%s:%d to %s:%d\n", 1233 IP_VS_DBG_ADDR(cp->af, &cp->caddr), 1234 ntohs(cp->cport), 1235 IP_VS_DBG_ADDR(cp->af, &cp->vaddr), 1236 ntohs(cp->vport)); 1237 1238 return; 1239 } 1240 1241 IP_VS_DBG_BUF(7, "DELeting control for: " 1242 "cp.dst=%s:%d ctl_cp.dst=%s:%d\n", 1243 IP_VS_DBG_ADDR(cp->af, &cp->caddr), 1244 ntohs(cp->cport), 1245 IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr), 1246 ntohs(ctl_cp->cport)); 1247 1248 cp->control = NULL; 1249 if (atomic_read(&ctl_cp->n_control) == 0) { 1250 IP_VS_ERR_BUF("BUG control DEL with n=0 : " 1251 "%s:%d to %s:%d\n", 1252 IP_VS_DBG_ADDR(cp->af, &cp->caddr), 1253 ntohs(cp->cport), 1254 IP_VS_DBG_ADDR(cp->af, &cp->vaddr), 1255 ntohs(cp->vport)); 1256 1257 return; 1258 } 1259 atomic_dec(&ctl_cp->n_control); 1260} 1261 1262static inline void 1263ip_vs_control_add(struct ip_vs_conn *cp, struct ip_vs_conn *ctl_cp) 1264{ 1265 if (cp->control) { 1266 IP_VS_ERR_BUF("request control ADD for already controlled: " 1267 "%s:%d to %s:%d\n", 1268 IP_VS_DBG_ADDR(cp->af, &cp->caddr), 1269 ntohs(cp->cport), 1270 IP_VS_DBG_ADDR(cp->af, &cp->vaddr), 1271 ntohs(cp->vport)); 1272 1273 ip_vs_control_del(cp); 1274 } 1275 1276 IP_VS_DBG_BUF(7, "ADDing control for: " 1277 "cp.dst=%s:%d ctl_cp.dst=%s:%d\n", 1278 IP_VS_DBG_ADDR(cp->af, &cp->caddr), 1279 ntohs(cp->cport), 1280 IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr), 1281 ntohs(ctl_cp->cport)); 1282 1283 cp->control = ctl_cp; 1284 atomic_inc(&ctl_cp->n_control); 1285} 1286 1287/* IPVS netns init & cleanup functions */ 1288int ip_vs_estimator_net_init(struct netns_ipvs *ipvs); 1289int ip_vs_control_net_init(struct netns_ipvs *ipvs); 1290int ip_vs_protocol_net_init(struct netns_ipvs *ipvs); 1291int ip_vs_app_net_init(struct netns_ipvs *ipvs); 1292int ip_vs_conn_net_init(struct netns_ipvs *ipvs); 1293int ip_vs_sync_net_init(struct netns_ipvs *ipvs); 1294void ip_vs_conn_net_cleanup(struct netns_ipvs *ipvs); 1295void ip_vs_app_net_cleanup(struct netns_ipvs *ipvs); 1296void ip_vs_protocol_net_cleanup(struct netns_ipvs *ipvs); 1297void ip_vs_control_net_cleanup(struct netns_ipvs *ipvs); 1298void ip_vs_estimator_net_cleanup(struct netns_ipvs *ipvs); 1299void ip_vs_sync_net_cleanup(struct netns_ipvs *ipvs); 1300void ip_vs_service_net_cleanup(struct netns_ipvs *ipvs); 1301 1302/* IPVS application functions 1303 * (from ip_vs_app.c) 1304 */ 1305#define IP_VS_APP_MAX_PORTS 8 1306struct ip_vs_app *register_ip_vs_app(struct netns_ipvs *ipvs, struct ip_vs_app *app); 1307void unregister_ip_vs_app(struct netns_ipvs *ipvs, struct ip_vs_app *app); 1308int ip_vs_bind_app(struct ip_vs_conn *cp, struct ip_vs_protocol *pp); 1309void ip_vs_unbind_app(struct ip_vs_conn *cp); 1310int register_ip_vs_app_inc(struct netns_ipvs *ipvs, struct ip_vs_app *app, __u16 proto, 1311 __u16 port); 1312int ip_vs_app_inc_get(struct ip_vs_app *inc); 1313void ip_vs_app_inc_put(struct ip_vs_app *inc); 1314 1315int ip_vs_app_pkt_out(struct ip_vs_conn *, struct sk_buff *skb); 1316int ip_vs_app_pkt_in(struct ip_vs_conn *, struct sk_buff *skb); 1317 1318int register_ip_vs_pe(struct ip_vs_pe *pe); 1319int unregister_ip_vs_pe(struct ip_vs_pe *pe); 1320struct ip_vs_pe *ip_vs_pe_getbyname(const char *name); 1321struct ip_vs_pe *__ip_vs_pe_getbyname(const char *pe_name); 1322 1323/* Use a #define to avoid all of module.h just for these trivial ops */ 1324#define ip_vs_pe_get(pe) \ 1325 if (pe && pe->module) \ 1326 __module_get(pe->module); 1327 1328#define ip_vs_pe_put(pe) \ 1329 if (pe && pe->module) \ 1330 module_put(pe->module); 1331 1332/* IPVS protocol functions (from ip_vs_proto.c) */ 1333int ip_vs_protocol_init(void); 1334void ip_vs_protocol_cleanup(void); 1335void ip_vs_protocol_timeout_change(struct netns_ipvs *ipvs, int flags); 1336int *ip_vs_create_timeout_table(int *table, int size); 1337int ip_vs_set_state_timeout(int *table, int num, const char *const *names, 1338 const char *name, int to); 1339void ip_vs_tcpudp_debug_packet(int af, struct ip_vs_protocol *pp, 1340 const struct sk_buff *skb, int offset, 1341 const char *msg); 1342 1343extern struct ip_vs_protocol ip_vs_protocol_tcp; 1344extern struct ip_vs_protocol ip_vs_protocol_udp; 1345extern struct ip_vs_protocol ip_vs_protocol_icmp; 1346extern struct ip_vs_protocol ip_vs_protocol_esp; 1347extern struct ip_vs_protocol ip_vs_protocol_ah; 1348extern struct ip_vs_protocol ip_vs_protocol_sctp; 1349 1350/* Registering/unregistering scheduler functions 1351 * (from ip_vs_sched.c) 1352 */ 1353int register_ip_vs_scheduler(struct ip_vs_scheduler *scheduler); 1354int unregister_ip_vs_scheduler(struct ip_vs_scheduler *scheduler); 1355int ip_vs_bind_scheduler(struct ip_vs_service *svc, 1356 struct ip_vs_scheduler *scheduler); 1357void ip_vs_unbind_scheduler(struct ip_vs_service *svc, 1358 struct ip_vs_scheduler *sched); 1359struct ip_vs_scheduler *ip_vs_scheduler_get(const char *sched_name); 1360void ip_vs_scheduler_put(struct ip_vs_scheduler *scheduler); 1361struct ip_vs_conn * 1362ip_vs_schedule(struct ip_vs_service *svc, struct sk_buff *skb, 1363 struct ip_vs_proto_data *pd, int *ignored, 1364 struct ip_vs_iphdr *iph); 1365int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb, 1366 struct ip_vs_proto_data *pd, struct ip_vs_iphdr *iph); 1367 1368void ip_vs_scheduler_err(struct ip_vs_service *svc, const char *msg); 1369 1370/* IPVS control data and functions (from ip_vs_ctl.c) */ 1371extern struct ip_vs_stats ip_vs_stats; 1372extern int sysctl_ip_vs_sync_ver; 1373 1374struct ip_vs_service * 1375ip_vs_service_find(struct netns_ipvs *ipvs, int af, __u32 fwmark, __u16 protocol, 1376 const union nf_inet_addr *vaddr, __be16 vport); 1377 1378bool ip_vs_has_real_service(struct netns_ipvs *ipvs, int af, __u16 protocol, 1379 const union nf_inet_addr *daddr, __be16 dport); 1380 1381int ip_vs_use_count_inc(void); 1382void ip_vs_use_count_dec(void); 1383int ip_vs_register_nl_ioctl(void); 1384void ip_vs_unregister_nl_ioctl(void); 1385int ip_vs_control_init(void); 1386void ip_vs_control_cleanup(void); 1387struct ip_vs_dest * 1388ip_vs_find_dest(struct netns_ipvs *ipvs, int svc_af, int dest_af, 1389 const union nf_inet_addr *daddr, __be16 dport, 1390 const union nf_inet_addr *vaddr, __be16 vport, 1391 __u16 protocol, __u32 fwmark, __u32 flags); 1392void ip_vs_try_bind_dest(struct ip_vs_conn *cp); 1393 1394static inline void ip_vs_dest_hold(struct ip_vs_dest *dest) 1395{ 1396 atomic_inc(&dest->refcnt); 1397} 1398 1399static inline void ip_vs_dest_put(struct ip_vs_dest *dest) 1400{ 1401 smp_mb__before_atomic(); 1402 atomic_dec(&dest->refcnt); 1403} 1404 1405static inline void ip_vs_dest_put_and_free(struct ip_vs_dest *dest) 1406{ 1407 if (atomic_dec_return(&dest->refcnt) < 0) 1408 kfree(dest); 1409} 1410 1411/* IPVS sync daemon data and function prototypes 1412 * (from ip_vs_sync.c) 1413 */ 1414int start_sync_thread(struct netns_ipvs *ipvs, struct ipvs_sync_daemon_cfg *cfg, 1415 int state); 1416int stop_sync_thread(struct netns_ipvs *ipvs, int state); 1417void ip_vs_sync_conn(struct netns_ipvs *ipvs, struct ip_vs_conn *cp, int pkts); 1418 1419/* IPVS rate estimator prototypes (from ip_vs_est.c) */ 1420void ip_vs_start_estimator(struct netns_ipvs *ipvs, struct ip_vs_stats *stats); 1421void ip_vs_stop_estimator(struct netns_ipvs *ipvs, struct ip_vs_stats *stats); 1422void ip_vs_zero_estimator(struct ip_vs_stats *stats); 1423void ip_vs_read_estimator(struct ip_vs_kstats *dst, struct ip_vs_stats *stats); 1424 1425/* Various IPVS packet transmitters (from ip_vs_xmit.c) */ 1426int ip_vs_null_xmit(struct sk_buff *skb, struct ip_vs_conn *cp, 1427 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph); 1428int ip_vs_bypass_xmit(struct sk_buff *skb, struct ip_vs_conn *cp, 1429 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph); 1430int ip_vs_nat_xmit(struct sk_buff *skb, struct ip_vs_conn *cp, 1431 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph); 1432int ip_vs_tunnel_xmit(struct sk_buff *skb, struct ip_vs_conn *cp, 1433 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph); 1434int ip_vs_dr_xmit(struct sk_buff *skb, struct ip_vs_conn *cp, 1435 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph); 1436int ip_vs_icmp_xmit(struct sk_buff *skb, struct ip_vs_conn *cp, 1437 struct ip_vs_protocol *pp, int offset, 1438 unsigned int hooknum, struct ip_vs_iphdr *iph); 1439void ip_vs_dest_dst_rcu_free(struct rcu_head *head); 1440 1441#ifdef CONFIG_IP_VS_IPV6 1442int ip_vs_bypass_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp, 1443 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph); 1444int ip_vs_nat_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp, 1445 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph); 1446int ip_vs_tunnel_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp, 1447 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph); 1448int ip_vs_dr_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp, 1449 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph); 1450int ip_vs_icmp_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp, 1451 struct ip_vs_protocol *pp, int offset, 1452 unsigned int hooknum, struct ip_vs_iphdr *iph); 1453#endif 1454 1455#ifdef CONFIG_SYSCTL 1456/* This is a simple mechanism to ignore packets when 1457 * we are loaded. Just set ip_vs_drop_rate to 'n' and 1458 * we start to drop 1/rate of the packets 1459 */ 1460static inline int ip_vs_todrop(struct netns_ipvs *ipvs) 1461{ 1462 if (!ipvs->drop_rate) 1463 return 0; 1464 if (--ipvs->drop_counter > 0) 1465 return 0; 1466 ipvs->drop_counter = ipvs->drop_rate; 1467 return 1; 1468} 1469#else 1470static inline int ip_vs_todrop(struct netns_ipvs *ipvs) { return 0; } 1471#endif 1472 1473/* ip_vs_fwd_tag returns the forwarding tag of the connection */ 1474#define IP_VS_FWD_METHOD(cp) (cp->flags & IP_VS_CONN_F_FWD_MASK) 1475 1476static inline char ip_vs_fwd_tag(struct ip_vs_conn *cp) 1477{ 1478 char fwd; 1479 1480 switch (IP_VS_FWD_METHOD(cp)) { 1481 case IP_VS_CONN_F_MASQ: 1482 fwd = 'M'; break; 1483 case IP_VS_CONN_F_LOCALNODE: 1484 fwd = 'L'; break; 1485 case IP_VS_CONN_F_TUNNEL: 1486 fwd = 'T'; break; 1487 case IP_VS_CONN_F_DROUTE: 1488 fwd = 'R'; break; 1489 case IP_VS_CONN_F_BYPASS: 1490 fwd = 'B'; break; 1491 default: 1492 fwd = '?'; break; 1493 } 1494 return fwd; 1495} 1496 1497void ip_vs_nat_icmp(struct sk_buff *skb, struct ip_vs_protocol *pp, 1498 struct ip_vs_conn *cp, int dir); 1499 1500#ifdef CONFIG_IP_VS_IPV6 1501void ip_vs_nat_icmp_v6(struct sk_buff *skb, struct ip_vs_protocol *pp, 1502 struct ip_vs_conn *cp, int dir); 1503#endif 1504 1505__sum16 ip_vs_checksum_complete(struct sk_buff *skb, int offset); 1506 1507static inline __wsum ip_vs_check_diff4(__be32 old, __be32 new, __wsum oldsum) 1508{ 1509 __be32 diff[2] = { ~old, new }; 1510 1511 return csum_partial(diff, sizeof(diff), oldsum); 1512} 1513 1514#ifdef CONFIG_IP_VS_IPV6 1515static inline __wsum ip_vs_check_diff16(const __be32 *old, const __be32 *new, 1516 __wsum oldsum) 1517{ 1518 __be32 diff[8] = { ~old[3], ~old[2], ~old[1], ~old[0], 1519 new[3], new[2], new[1], new[0] }; 1520 1521 return csum_partial(diff, sizeof(diff), oldsum); 1522} 1523#endif 1524 1525static inline __wsum ip_vs_check_diff2(__be16 old, __be16 new, __wsum oldsum) 1526{ 1527 __be16 diff[2] = { ~old, new }; 1528 1529 return csum_partial(diff, sizeof(diff), oldsum); 1530} 1531 1532/* Forget current conntrack (unconfirmed) and attach notrack entry */ 1533static inline void ip_vs_notrack(struct sk_buff *skb) 1534{ 1535#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) 1536 enum ip_conntrack_info ctinfo; 1537 struct nf_conn *ct = nf_ct_get(skb, &ctinfo); 1538 1539 if (!ct || !nf_ct_is_untracked(ct)) { 1540 nf_conntrack_put(skb->nfct); 1541 skb->nfct = &nf_ct_untracked_get()->ct_general; 1542 skb->nfctinfo = IP_CT_NEW; 1543 nf_conntrack_get(skb->nfct); 1544 } 1545#endif 1546} 1547 1548#ifdef CONFIG_IP_VS_NFCT 1549/* Netfilter connection tracking 1550 * (from ip_vs_nfct.c) 1551 */ 1552static inline int ip_vs_conntrack_enabled(struct netns_ipvs *ipvs) 1553{ 1554#ifdef CONFIG_SYSCTL 1555 return ipvs->sysctl_conntrack; 1556#else 1557 return 0; 1558#endif 1559} 1560 1561void ip_vs_update_conntrack(struct sk_buff *skb, struct ip_vs_conn *cp, 1562 int outin); 1563int ip_vs_confirm_conntrack(struct sk_buff *skb); 1564void ip_vs_nfct_expect_related(struct sk_buff *skb, struct nf_conn *ct, 1565 struct ip_vs_conn *cp, u_int8_t proto, 1566 const __be16 port, int from_rs); 1567void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp); 1568 1569#else 1570 1571static inline int ip_vs_conntrack_enabled(struct netns_ipvs *ipvs) 1572{ 1573 return 0; 1574} 1575 1576static inline void ip_vs_update_conntrack(struct sk_buff *skb, 1577 struct ip_vs_conn *cp, int outin) 1578{ 1579} 1580 1581static inline int ip_vs_confirm_conntrack(struct sk_buff *skb) 1582{ 1583 return NF_ACCEPT; 1584} 1585 1586static inline void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp) 1587{ 1588} 1589#endif /* CONFIG_IP_VS_NFCT */ 1590 1591/* Really using conntrack? */ 1592static inline bool ip_vs_conn_uses_conntrack(struct ip_vs_conn *cp, 1593 struct sk_buff *skb) 1594{ 1595#ifdef CONFIG_IP_VS_NFCT 1596 enum ip_conntrack_info ctinfo; 1597 struct nf_conn *ct; 1598 1599 if (!(cp->flags & IP_VS_CONN_F_NFCT)) 1600 return false; 1601 ct = nf_ct_get(skb, &ctinfo); 1602 if (ct && !nf_ct_is_untracked(ct)) 1603 return true; 1604#endif 1605 return false; 1606} 1607 1608static inline int 1609ip_vs_dest_conn_overhead(struct ip_vs_dest *dest) 1610{ 1611 /* We think the overhead of processing active connections is 256 1612 * times higher than that of inactive connections in average. (This 1613 * 256 times might not be accurate, we will change it later) We 1614 * use the following formula to estimate the overhead now: 1615 * dest->activeconns*256 + dest->inactconns 1616 */ 1617 return (atomic_read(&dest->activeconns) << 8) + 1618 atomic_read(&dest->inactconns); 1619} 1620 1621#endif /* _NET_IP_VS_H */ 1622