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 #include <asm/types.h> /* for __uXX types */ 12 13 #include <linux/list.h> /* for struct list_head */ 14 #include <linux/spinlock.h> /* for struct rwlock_t */ 15 #include <linux/atomic.h> /* for struct atomic_t */ 16 #include <linux/compiler.h> 17 #include <linux/timer.h> 18 #include <linux/bug.h> 19 20 #include <net/checksum.h> 21 #include <linux/netfilter.h> /* for union nf_inet_addr */ 22 #include <linux/ip.h> 23 #include <linux/ipv6.h> /* for struct ipv6hdr */ 24 #include <net/ipv6.h> 25 #if IS_ENABLED(CONFIG_IP_VS_IPV6) 26 #include <linux/netfilter_ipv6/ip6_tables.h> 27 #endif 28 #if IS_ENABLED(CONFIG_NF_CONNTRACK) 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 struct ip_vs_iphdr { 110 __u32 len; /* IPv4 simply where L4 starts 111 IPv6 where L4 Transport Header starts */ 112 __u32 thoff_reasm; /* Transport Header Offset in nfct_reasm skb */ 113 __u16 fragoffs; /* IPv6 fragment offset, 0 if first frag (or not frag)*/ 114 __s16 protocol; 115 __s32 flags; 116 union nf_inet_addr saddr; 117 union nf_inet_addr daddr; 118 }; 119 120 /* Dependency to module: nf_defrag_ipv6 */ 121 #if defined(CONFIG_NF_DEFRAG_IPV6) || defined(CONFIG_NF_DEFRAG_IPV6_MODULE) 122 static inline struct sk_buff *skb_nfct_reasm(const struct sk_buff *skb) 123 { 124 return skb->nfct_reasm; 125 } 126 static inline void *frag_safe_skb_hp(const struct sk_buff *skb, int offset, 127 int len, void *buffer, 128 const struct ip_vs_iphdr *ipvsh) 129 { 130 if (unlikely(ipvsh->fragoffs && skb_nfct_reasm(skb))) 131 return skb_header_pointer(skb_nfct_reasm(skb), 132 ipvsh->thoff_reasm, len, buffer); 133 134 return skb_header_pointer(skb, offset, len, buffer); 135 } 136 #else 137 static inline struct sk_buff *skb_nfct_reasm(const struct sk_buff *skb) 138 { 139 return NULL; 140 } 141 static inline void *frag_safe_skb_hp(const struct sk_buff *skb, int offset, 142 int len, void *buffer, 143 const struct ip_vs_iphdr *ipvsh) 144 { 145 return skb_header_pointer(skb, offset, len, buffer); 146 } 147 #endif 148 149 static inline void 150 ip_vs_fill_ip4hdr(const void *nh, struct ip_vs_iphdr *iphdr) 151 { 152 const struct iphdr *iph = nh; 153 154 iphdr->len = iph->ihl * 4; 155 iphdr->fragoffs = 0; 156 iphdr->protocol = iph->protocol; 157 iphdr->saddr.ip = iph->saddr; 158 iphdr->daddr.ip = iph->daddr; 159 } 160 161 /* This function handles filling *ip_vs_iphdr, both for IPv4 and IPv6. 162 * IPv6 requires some extra work, as finding proper header position, 163 * depend on the IPv6 extension headers. 164 */ 165 static inline void 166 ip_vs_fill_iph_skb(int af, const struct sk_buff *skb, struct ip_vs_iphdr *iphdr) 167 { 168 #ifdef CONFIG_IP_VS_IPV6 169 if (af == AF_INET6) { 170 const struct ipv6hdr *iph = 171 (struct ipv6hdr *)skb_network_header(skb); 172 iphdr->saddr.in6 = iph->saddr; 173 iphdr->daddr.in6 = iph->daddr; 174 /* ipv6_find_hdr() updates len, flags, thoff_reasm */ 175 iphdr->thoff_reasm = 0; 176 iphdr->len = 0; 177 iphdr->flags = 0; 178 iphdr->protocol = ipv6_find_hdr(skb, &iphdr->len, -1, 179 &iphdr->fragoffs, 180 &iphdr->flags); 181 /* get proto from re-assembled packet and it's offset */ 182 if (skb_nfct_reasm(skb)) 183 iphdr->protocol = ipv6_find_hdr(skb_nfct_reasm(skb), 184 &iphdr->thoff_reasm, 185 -1, NULL, NULL); 186 187 } else 188 #endif 189 { 190 const struct iphdr *iph = 191 (struct iphdr *)skb_network_header(skb); 192 iphdr->len = iph->ihl * 4; 193 iphdr->fragoffs = 0; 194 iphdr->protocol = iph->protocol; 195 iphdr->saddr.ip = iph->saddr; 196 iphdr->daddr.ip = iph->daddr; 197 } 198 } 199 200 /* This function is a faster version of ip_vs_fill_iph_skb(). 201 * Where we only populate {s,d}addr (and avoid calling ipv6_find_hdr()). 202 * This is used by the some of the ip_vs_*_schedule() functions. 203 * (Mostly done to avoid ABI breakage of external schedulers) 204 */ 205 static inline void 206 ip_vs_fill_iph_addr_only(int af, const struct sk_buff *skb, 207 struct ip_vs_iphdr *iphdr) 208 { 209 #ifdef CONFIG_IP_VS_IPV6 210 if (af == AF_INET6) { 211 const struct ipv6hdr *iph = 212 (struct ipv6hdr *)skb_network_header(skb); 213 iphdr->saddr.in6 = iph->saddr; 214 iphdr->daddr.in6 = iph->daddr; 215 } else 216 #endif 217 { 218 const struct iphdr *iph = 219 (struct iphdr *)skb_network_header(skb); 220 iphdr->saddr.ip = iph->saddr; 221 iphdr->daddr.ip = iph->daddr; 222 } 223 } 224 225 static inline void ip_vs_addr_copy(int af, union nf_inet_addr *dst, 226 const union nf_inet_addr *src) 227 { 228 #ifdef CONFIG_IP_VS_IPV6 229 if (af == AF_INET6) 230 dst->in6 = src->in6; 231 else 232 #endif 233 dst->ip = src->ip; 234 } 235 236 static inline int ip_vs_addr_equal(int af, const union nf_inet_addr *a, 237 const union nf_inet_addr *b) 238 { 239 #ifdef CONFIG_IP_VS_IPV6 240 if (af == AF_INET6) 241 return ipv6_addr_equal(&a->in6, &b->in6); 242 #endif 243 return a->ip == b->ip; 244 } 245 246 #ifdef CONFIG_IP_VS_DEBUG 247 #include <linux/net.h> 248 249 extern int ip_vs_get_debug_level(void); 250 251 static inline const char *ip_vs_dbg_addr(int af, char *buf, size_t buf_len, 252 const union nf_inet_addr *addr, 253 int *idx) 254 { 255 int len; 256 #ifdef CONFIG_IP_VS_IPV6 257 if (af == AF_INET6) 258 len = snprintf(&buf[*idx], buf_len - *idx, "[%pI6c]", 259 &addr->in6) + 1; 260 else 261 #endif 262 len = snprintf(&buf[*idx], buf_len - *idx, "%pI4", 263 &addr->ip) + 1; 264 265 *idx += len; 266 BUG_ON(*idx > buf_len + 1); 267 return &buf[*idx - len]; 268 } 269 270 #define IP_VS_DBG_BUF(level, msg, ...) \ 271 do { \ 272 char ip_vs_dbg_buf[160]; \ 273 int ip_vs_dbg_idx = 0; \ 274 if (level <= ip_vs_get_debug_level()) \ 275 printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \ 276 } while (0) 277 #define IP_VS_ERR_BUF(msg...) \ 278 do { \ 279 char ip_vs_dbg_buf[160]; \ 280 int ip_vs_dbg_idx = 0; \ 281 pr_err(msg); \ 282 } while (0) 283 284 /* Only use from within IP_VS_DBG_BUF() or IP_VS_ERR_BUF macros */ 285 #define IP_VS_DBG_ADDR(af, addr) \ 286 ip_vs_dbg_addr(af, ip_vs_dbg_buf, \ 287 sizeof(ip_vs_dbg_buf), addr, \ 288 &ip_vs_dbg_idx) 289 290 #define IP_VS_DBG(level, msg, ...) \ 291 do { \ 292 if (level <= ip_vs_get_debug_level()) \ 293 printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \ 294 } while (0) 295 #define IP_VS_DBG_RL(msg, ...) \ 296 do { \ 297 if (net_ratelimit()) \ 298 printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \ 299 } while (0) 300 #define IP_VS_DBG_PKT(level, af, pp, skb, ofs, msg) \ 301 do { \ 302 if (level <= ip_vs_get_debug_level()) \ 303 pp->debug_packet(af, pp, skb, ofs, msg); \ 304 } while (0) 305 #define IP_VS_DBG_RL_PKT(level, af, pp, skb, ofs, msg) \ 306 do { \ 307 if (level <= ip_vs_get_debug_level() && \ 308 net_ratelimit()) \ 309 pp->debug_packet(af, pp, skb, ofs, msg); \ 310 } while (0) 311 #else /* NO DEBUGGING at ALL */ 312 #define IP_VS_DBG_BUF(level, msg...) do {} while (0) 313 #define IP_VS_ERR_BUF(msg...) do {} while (0) 314 #define IP_VS_DBG(level, msg...) do {} while (0) 315 #define IP_VS_DBG_RL(msg...) do {} while (0) 316 #define IP_VS_DBG_PKT(level, af, pp, skb, ofs, msg) do {} while (0) 317 #define IP_VS_DBG_RL_PKT(level, af, pp, skb, ofs, msg) do {} while (0) 318 #endif 319 320 #define IP_VS_BUG() BUG() 321 #define IP_VS_ERR_RL(msg, ...) \ 322 do { \ 323 if (net_ratelimit()) \ 324 pr_err(msg, ##__VA_ARGS__); \ 325 } while (0) 326 327 #ifdef CONFIG_IP_VS_DEBUG 328 #define EnterFunction(level) \ 329 do { \ 330 if (level <= ip_vs_get_debug_level()) \ 331 printk(KERN_DEBUG \ 332 pr_fmt("Enter: %s, %s line %i\n"), \ 333 __func__, __FILE__, __LINE__); \ 334 } while (0) 335 #define LeaveFunction(level) \ 336 do { \ 337 if (level <= ip_vs_get_debug_level()) \ 338 printk(KERN_DEBUG \ 339 pr_fmt("Leave: %s, %s line %i\n"), \ 340 __func__, __FILE__, __LINE__); \ 341 } while (0) 342 #else 343 #define EnterFunction(level) do {} while (0) 344 #define LeaveFunction(level) do {} while (0) 345 #endif 346 347 #define IP_VS_WAIT_WHILE(expr) while (expr) { cpu_relax(); } 348 349 350 /* 351 * The port number of FTP service (in network order). 352 */ 353 #define FTPPORT cpu_to_be16(21) 354 #define FTPDATA cpu_to_be16(20) 355 356 /* 357 * TCP State Values 358 */ 359 enum { 360 IP_VS_TCP_S_NONE = 0, 361 IP_VS_TCP_S_ESTABLISHED, 362 IP_VS_TCP_S_SYN_SENT, 363 IP_VS_TCP_S_SYN_RECV, 364 IP_VS_TCP_S_FIN_WAIT, 365 IP_VS_TCP_S_TIME_WAIT, 366 IP_VS_TCP_S_CLOSE, 367 IP_VS_TCP_S_CLOSE_WAIT, 368 IP_VS_TCP_S_LAST_ACK, 369 IP_VS_TCP_S_LISTEN, 370 IP_VS_TCP_S_SYNACK, 371 IP_VS_TCP_S_LAST 372 }; 373 374 /* 375 * UDP State Values 376 */ 377 enum { 378 IP_VS_UDP_S_NORMAL, 379 IP_VS_UDP_S_LAST, 380 }; 381 382 /* 383 * ICMP State Values 384 */ 385 enum { 386 IP_VS_ICMP_S_NORMAL, 387 IP_VS_ICMP_S_LAST, 388 }; 389 390 /* 391 * SCTP State Values 392 */ 393 enum ip_vs_sctp_states { 394 IP_VS_SCTP_S_NONE, 395 IP_VS_SCTP_S_INIT_CLI, 396 IP_VS_SCTP_S_INIT_SER, 397 IP_VS_SCTP_S_INIT_ACK_CLI, 398 IP_VS_SCTP_S_INIT_ACK_SER, 399 IP_VS_SCTP_S_ECHO_CLI, 400 IP_VS_SCTP_S_ECHO_SER, 401 IP_VS_SCTP_S_ESTABLISHED, 402 IP_VS_SCTP_S_SHUT_CLI, 403 IP_VS_SCTP_S_SHUT_SER, 404 IP_VS_SCTP_S_SHUT_ACK_CLI, 405 IP_VS_SCTP_S_SHUT_ACK_SER, 406 IP_VS_SCTP_S_CLOSED, 407 IP_VS_SCTP_S_LAST 408 }; 409 410 /* 411 * Delta sequence info structure 412 * Each ip_vs_conn has 2 (output AND input seq. changes). 413 * Only used in the VS/NAT. 414 */ 415 struct ip_vs_seq { 416 __u32 init_seq; /* Add delta from this seq */ 417 __u32 delta; /* Delta in sequence numbers */ 418 __u32 previous_delta; /* Delta in sequence numbers 419 before last resized pkt */ 420 }; 421 422 /* 423 * counters per cpu 424 */ 425 struct ip_vs_counters { 426 __u32 conns; /* connections scheduled */ 427 __u32 inpkts; /* incoming packets */ 428 __u32 outpkts; /* outgoing packets */ 429 __u64 inbytes; /* incoming bytes */ 430 __u64 outbytes; /* outgoing bytes */ 431 }; 432 /* 433 * Stats per cpu 434 */ 435 struct ip_vs_cpu_stats { 436 struct ip_vs_counters ustats; 437 struct u64_stats_sync syncp; 438 }; 439 440 /* 441 * IPVS statistics objects 442 */ 443 struct ip_vs_estimator { 444 struct list_head list; 445 446 u64 last_inbytes; 447 u64 last_outbytes; 448 u32 last_conns; 449 u32 last_inpkts; 450 u32 last_outpkts; 451 452 u32 cps; 453 u32 inpps; 454 u32 outpps; 455 u32 inbps; 456 u32 outbps; 457 }; 458 459 struct ip_vs_stats { 460 struct ip_vs_stats_user ustats; /* statistics */ 461 struct ip_vs_estimator est; /* estimator */ 462 struct ip_vs_cpu_stats *cpustats; /* per cpu counters */ 463 spinlock_t lock; /* spin lock */ 464 struct ip_vs_stats_user ustats0; /* reset values */ 465 }; 466 467 struct dst_entry; 468 struct iphdr; 469 struct ip_vs_conn; 470 struct ip_vs_app; 471 struct sk_buff; 472 struct ip_vs_proto_data; 473 474 struct ip_vs_protocol { 475 struct ip_vs_protocol *next; 476 char *name; 477 u16 protocol; 478 u16 num_states; 479 int dont_defrag; 480 481 void (*init)(struct ip_vs_protocol *pp); 482 483 void (*exit)(struct ip_vs_protocol *pp); 484 485 int (*init_netns)(struct net *net, struct ip_vs_proto_data *pd); 486 487 void (*exit_netns)(struct net *net, struct ip_vs_proto_data *pd); 488 489 int (*conn_schedule)(int af, struct sk_buff *skb, 490 struct ip_vs_proto_data *pd, 491 int *verdict, struct ip_vs_conn **cpp, 492 struct ip_vs_iphdr *iph); 493 494 struct ip_vs_conn * 495 (*conn_in_get)(int af, 496 const struct sk_buff *skb, 497 const struct ip_vs_iphdr *iph, 498 int inverse); 499 500 struct ip_vs_conn * 501 (*conn_out_get)(int af, 502 const struct sk_buff *skb, 503 const struct ip_vs_iphdr *iph, 504 int inverse); 505 506 int (*snat_handler)(struct sk_buff *skb, struct ip_vs_protocol *pp, 507 struct ip_vs_conn *cp, struct ip_vs_iphdr *iph); 508 509 int (*dnat_handler)(struct sk_buff *skb, struct ip_vs_protocol *pp, 510 struct ip_vs_conn *cp, struct ip_vs_iphdr *iph); 511 512 int (*csum_check)(int af, struct sk_buff *skb, 513 struct ip_vs_protocol *pp); 514 515 const char *(*state_name)(int state); 516 517 void (*state_transition)(struct ip_vs_conn *cp, int direction, 518 const struct sk_buff *skb, 519 struct ip_vs_proto_data *pd); 520 521 int (*register_app)(struct net *net, struct ip_vs_app *inc); 522 523 void (*unregister_app)(struct net *net, struct ip_vs_app *inc); 524 525 int (*app_conn_bind)(struct ip_vs_conn *cp); 526 527 void (*debug_packet)(int af, struct ip_vs_protocol *pp, 528 const struct sk_buff *skb, 529 int offset, 530 const char *msg); 531 532 void (*timeout_change)(struct ip_vs_proto_data *pd, int flags); 533 }; 534 535 /* 536 * protocol data per netns 537 */ 538 struct ip_vs_proto_data { 539 struct ip_vs_proto_data *next; 540 struct ip_vs_protocol *pp; 541 int *timeout_table; /* protocol timeout table */ 542 atomic_t appcnt; /* counter of proto app incs. */ 543 struct tcp_states_t *tcp_state_table; 544 }; 545 546 extern struct ip_vs_protocol *ip_vs_proto_get(unsigned short proto); 547 extern struct ip_vs_proto_data *ip_vs_proto_data_get(struct net *net, 548 unsigned short proto); 549 550 struct ip_vs_conn_param { 551 struct net *net; 552 const union nf_inet_addr *caddr; 553 const union nf_inet_addr *vaddr; 554 __be16 cport; 555 __be16 vport; 556 __u16 protocol; 557 u16 af; 558 559 const struct ip_vs_pe *pe; 560 char *pe_data; 561 __u8 pe_data_len; 562 }; 563 564 /* 565 * IP_VS structure allocated for each dynamically scheduled connection 566 */ 567 struct ip_vs_conn { 568 struct hlist_node c_list; /* hashed list heads */ 569 #ifdef CONFIG_NET_NS 570 struct net *net; /* Name space */ 571 #endif 572 /* Protocol, addresses and port numbers */ 573 u16 af; /* address family */ 574 __be16 cport; 575 __be16 vport; 576 __be16 dport; 577 __u32 fwmark; /* Fire wall mark from skb */ 578 union nf_inet_addr caddr; /* client address */ 579 union nf_inet_addr vaddr; /* virtual address */ 580 union nf_inet_addr daddr; /* destination address */ 581 volatile __u32 flags; /* status flags */ 582 __u16 protocol; /* Which protocol (TCP/UDP) */ 583 584 /* counter and timer */ 585 atomic_t refcnt; /* reference count */ 586 struct timer_list timer; /* Expiration timer */ 587 volatile unsigned long timeout; /* timeout */ 588 589 /* Flags and state transition */ 590 spinlock_t lock; /* lock for state transition */ 591 volatile __u16 state; /* state info */ 592 volatile __u16 old_state; /* old state, to be used for 593 * state transition triggerd 594 * synchronization 595 */ 596 unsigned long sync_endtime; /* jiffies + sent_retries */ 597 598 /* Control members */ 599 struct ip_vs_conn *control; /* Master control connection */ 600 atomic_t n_control; /* Number of controlled ones */ 601 struct ip_vs_dest *dest; /* real server */ 602 atomic_t in_pkts; /* incoming packet counter */ 603 604 /* packet transmitter for different forwarding methods. If it 605 mangles the packet, it must return NF_DROP or better NF_STOLEN, 606 otherwise this must be changed to a sk_buff **. 607 NF_ACCEPT can be returned when destination is local. 608 */ 609 int (*packet_xmit)(struct sk_buff *skb, struct ip_vs_conn *cp, 610 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph); 611 612 /* Note: we can group the following members into a structure, 613 in order to save more space, and the following members are 614 only used in VS/NAT anyway */ 615 struct ip_vs_app *app; /* bound ip_vs_app object */ 616 void *app_data; /* Application private data */ 617 struct ip_vs_seq in_seq; /* incoming seq. struct */ 618 struct ip_vs_seq out_seq; /* outgoing seq. struct */ 619 620 const struct ip_vs_pe *pe; 621 char *pe_data; 622 __u8 pe_data_len; 623 }; 624 625 /* 626 * To save some memory in conn table when name space is disabled. 627 */ 628 static inline struct net *ip_vs_conn_net(const struct ip_vs_conn *cp) 629 { 630 #ifdef CONFIG_NET_NS 631 return cp->net; 632 #else 633 return &init_net; 634 #endif 635 } 636 static inline void ip_vs_conn_net_set(struct ip_vs_conn *cp, struct net *net) 637 { 638 #ifdef CONFIG_NET_NS 639 cp->net = net; 640 #endif 641 } 642 643 static inline int ip_vs_conn_net_eq(const struct ip_vs_conn *cp, 644 struct net *net) 645 { 646 #ifdef CONFIG_NET_NS 647 return cp->net == net; 648 #else 649 return 1; 650 #endif 651 } 652 653 /* 654 * Extended internal versions of struct ip_vs_service_user and 655 * ip_vs_dest_user for IPv6 support. 656 * 657 * We need these to conveniently pass around service and destination 658 * options, but unfortunately, we also need to keep the old definitions to 659 * maintain userspace backwards compatibility for the setsockopt interface. 660 */ 661 struct ip_vs_service_user_kern { 662 /* virtual service addresses */ 663 u16 af; 664 u16 protocol; 665 union nf_inet_addr addr; /* virtual ip address */ 666 u16 port; 667 u32 fwmark; /* firwall mark of service */ 668 669 /* virtual service options */ 670 char *sched_name; 671 char *pe_name; 672 unsigned int flags; /* virtual service flags */ 673 unsigned int timeout; /* persistent timeout in sec */ 674 u32 netmask; /* persistent netmask */ 675 }; 676 677 678 struct ip_vs_dest_user_kern { 679 /* destination server address */ 680 union nf_inet_addr addr; 681 u16 port; 682 683 /* real server options */ 684 unsigned int conn_flags; /* connection flags */ 685 int weight; /* destination weight */ 686 687 /* thresholds for active connections */ 688 u32 u_threshold; /* upper threshold */ 689 u32 l_threshold; /* lower threshold */ 690 }; 691 692 693 /* 694 * The information about the virtual service offered to the net 695 * and the forwarding entries 696 */ 697 struct ip_vs_service { 698 struct list_head s_list; /* for normal service table */ 699 struct list_head f_list; /* for fwmark-based service table */ 700 atomic_t refcnt; /* reference counter */ 701 atomic_t usecnt; /* use counter */ 702 703 u16 af; /* address family */ 704 __u16 protocol; /* which protocol (TCP/UDP) */ 705 union nf_inet_addr addr; /* IP address for virtual service */ 706 __be16 port; /* port number for the service */ 707 __u32 fwmark; /* firewall mark of the service */ 708 unsigned int flags; /* service status flags */ 709 unsigned int timeout; /* persistent timeout in ticks */ 710 __be32 netmask; /* grouping granularity */ 711 struct net *net; 712 713 struct list_head destinations; /* real server d-linked list */ 714 __u32 num_dests; /* number of servers */ 715 struct ip_vs_stats stats; /* statistics for the service */ 716 struct ip_vs_app *inc; /* bind conns to this app inc */ 717 718 /* for scheduling */ 719 struct ip_vs_scheduler *scheduler; /* bound scheduler object */ 720 rwlock_t sched_lock; /* lock sched_data */ 721 void *sched_data; /* scheduler application data */ 722 723 /* alternate persistence engine */ 724 struct ip_vs_pe *pe; 725 }; 726 727 728 /* 729 * The real server destination forwarding entry 730 * with ip address, port number, and so on. 731 */ 732 struct ip_vs_dest { 733 struct list_head n_list; /* for the dests in the service */ 734 struct list_head d_list; /* for table with all the dests */ 735 736 u16 af; /* address family */ 737 __be16 port; /* port number of the server */ 738 union nf_inet_addr addr; /* IP address of the server */ 739 volatile unsigned int flags; /* dest status flags */ 740 atomic_t conn_flags; /* flags to copy to conn */ 741 atomic_t weight; /* server weight */ 742 743 atomic_t refcnt; /* reference counter */ 744 struct ip_vs_stats stats; /* statistics */ 745 746 /* connection counters and thresholds */ 747 atomic_t activeconns; /* active connections */ 748 atomic_t inactconns; /* inactive connections */ 749 atomic_t persistconns; /* persistent connections */ 750 __u32 u_threshold; /* upper threshold */ 751 __u32 l_threshold; /* lower threshold */ 752 753 /* for destination cache */ 754 spinlock_t dst_lock; /* lock of dst_cache */ 755 struct dst_entry *dst_cache; /* destination cache entry */ 756 u32 dst_rtos; /* RT_TOS(tos) for dst */ 757 u32 dst_cookie; 758 union nf_inet_addr dst_saddr; 759 760 /* for virtual service */ 761 struct ip_vs_service *svc; /* service it belongs to */ 762 __u16 protocol; /* which protocol (TCP/UDP) */ 763 __be16 vport; /* virtual port number */ 764 union nf_inet_addr vaddr; /* virtual IP address */ 765 __u32 vfwmark; /* firewall mark of service */ 766 }; 767 768 769 /* 770 * The scheduler object 771 */ 772 struct ip_vs_scheduler { 773 struct list_head n_list; /* d-linked list head */ 774 char *name; /* scheduler name */ 775 atomic_t refcnt; /* reference counter */ 776 struct module *module; /* THIS_MODULE/NULL */ 777 778 /* scheduler initializing service */ 779 int (*init_service)(struct ip_vs_service *svc); 780 /* scheduling service finish */ 781 int (*done_service)(struct ip_vs_service *svc); 782 /* scheduler updating service */ 783 int (*update_service)(struct ip_vs_service *svc); 784 785 /* selecting a server from the given service */ 786 struct ip_vs_dest* (*schedule)(struct ip_vs_service *svc, 787 const struct sk_buff *skb); 788 }; 789 790 /* The persistence engine object */ 791 struct ip_vs_pe { 792 struct list_head n_list; /* d-linked list head */ 793 char *name; /* scheduler name */ 794 atomic_t refcnt; /* reference counter */ 795 struct module *module; /* THIS_MODULE/NULL */ 796 797 /* get the connection template, if any */ 798 int (*fill_param)(struct ip_vs_conn_param *p, struct sk_buff *skb); 799 bool (*ct_match)(const struct ip_vs_conn_param *p, 800 struct ip_vs_conn *ct); 801 u32 (*hashkey_raw)(const struct ip_vs_conn_param *p, u32 initval, 802 bool inverse); 803 int (*show_pe_data)(const struct ip_vs_conn *cp, char *buf); 804 }; 805 806 /* 807 * The application module object (a.k.a. app incarnation) 808 */ 809 struct ip_vs_app { 810 struct list_head a_list; /* member in app list */ 811 int type; /* IP_VS_APP_TYPE_xxx */ 812 char *name; /* application module name */ 813 __u16 protocol; 814 struct module *module; /* THIS_MODULE/NULL */ 815 struct list_head incs_list; /* list of incarnations */ 816 817 /* members for application incarnations */ 818 struct list_head p_list; /* member in proto app list */ 819 struct ip_vs_app *app; /* its real application */ 820 __be16 port; /* port number in net order */ 821 atomic_t usecnt; /* usage counter */ 822 823 /* 824 * output hook: Process packet in inout direction, diff set for TCP. 825 * Return: 0=Error, 1=Payload Not Mangled/Mangled but checksum is ok, 826 * 2=Mangled but checksum was not updated 827 */ 828 int (*pkt_out)(struct ip_vs_app *, struct ip_vs_conn *, 829 struct sk_buff *, int *diff); 830 831 /* 832 * input hook: Process packet in outin direction, diff set for TCP. 833 * Return: 0=Error, 1=Payload Not Mangled/Mangled but checksum is ok, 834 * 2=Mangled but checksum was not updated 835 */ 836 int (*pkt_in)(struct ip_vs_app *, struct ip_vs_conn *, 837 struct sk_buff *, int *diff); 838 839 /* ip_vs_app initializer */ 840 int (*init_conn)(struct ip_vs_app *, struct ip_vs_conn *); 841 842 /* ip_vs_app finish */ 843 int (*done_conn)(struct ip_vs_app *, struct ip_vs_conn *); 844 845 846 /* not used now */ 847 int (*bind_conn)(struct ip_vs_app *, struct ip_vs_conn *, 848 struct ip_vs_protocol *); 849 850 void (*unbind_conn)(struct ip_vs_app *, struct ip_vs_conn *); 851 852 int * timeout_table; 853 int * timeouts; 854 int timeouts_size; 855 856 int (*conn_schedule)(struct sk_buff *skb, struct ip_vs_app *app, 857 int *verdict, struct ip_vs_conn **cpp); 858 859 struct ip_vs_conn * 860 (*conn_in_get)(const struct sk_buff *skb, struct ip_vs_app *app, 861 const struct iphdr *iph, int inverse); 862 863 struct ip_vs_conn * 864 (*conn_out_get)(const struct sk_buff *skb, struct ip_vs_app *app, 865 const struct iphdr *iph, int inverse); 866 867 int (*state_transition)(struct ip_vs_conn *cp, int direction, 868 const struct sk_buff *skb, 869 struct ip_vs_app *app); 870 871 void (*timeout_change)(struct ip_vs_app *app, int flags); 872 }; 873 874 struct ipvs_master_sync_state { 875 struct list_head sync_queue; 876 struct ip_vs_sync_buff *sync_buff; 877 int sync_queue_len; 878 unsigned int sync_queue_delay; 879 struct task_struct *master_thread; 880 struct delayed_work master_wakeup_work; 881 struct netns_ipvs *ipvs; 882 }; 883 884 /* IPVS in network namespace */ 885 struct netns_ipvs { 886 int gen; /* Generation */ 887 int enable; /* enable like nf_hooks do */ 888 /* 889 * Hash table: for real service lookups 890 */ 891 #define IP_VS_RTAB_BITS 4 892 #define IP_VS_RTAB_SIZE (1 << IP_VS_RTAB_BITS) 893 #define IP_VS_RTAB_MASK (IP_VS_RTAB_SIZE - 1) 894 895 struct list_head rs_table[IP_VS_RTAB_SIZE]; 896 /* ip_vs_app */ 897 struct list_head app_list; 898 /* ip_vs_proto */ 899 #define IP_VS_PROTO_TAB_SIZE 32 /* must be power of 2 */ 900 struct ip_vs_proto_data *proto_data_table[IP_VS_PROTO_TAB_SIZE]; 901 /* ip_vs_proto_tcp */ 902 #ifdef CONFIG_IP_VS_PROTO_TCP 903 #define TCP_APP_TAB_BITS 4 904 #define TCP_APP_TAB_SIZE (1 << TCP_APP_TAB_BITS) 905 #define TCP_APP_TAB_MASK (TCP_APP_TAB_SIZE - 1) 906 struct list_head tcp_apps[TCP_APP_TAB_SIZE]; 907 spinlock_t tcp_app_lock; 908 #endif 909 /* ip_vs_proto_udp */ 910 #ifdef CONFIG_IP_VS_PROTO_UDP 911 #define UDP_APP_TAB_BITS 4 912 #define UDP_APP_TAB_SIZE (1 << UDP_APP_TAB_BITS) 913 #define UDP_APP_TAB_MASK (UDP_APP_TAB_SIZE - 1) 914 struct list_head udp_apps[UDP_APP_TAB_SIZE]; 915 spinlock_t udp_app_lock; 916 #endif 917 /* ip_vs_proto_sctp */ 918 #ifdef CONFIG_IP_VS_PROTO_SCTP 919 #define SCTP_APP_TAB_BITS 4 920 #define SCTP_APP_TAB_SIZE (1 << SCTP_APP_TAB_BITS) 921 #define SCTP_APP_TAB_MASK (SCTP_APP_TAB_SIZE - 1) 922 /* Hash table for SCTP application incarnations */ 923 struct list_head sctp_apps[SCTP_APP_TAB_SIZE]; 924 spinlock_t sctp_app_lock; 925 #endif 926 /* ip_vs_conn */ 927 atomic_t conn_count; /* connection counter */ 928 929 /* ip_vs_ctl */ 930 struct ip_vs_stats tot_stats; /* Statistics & est. */ 931 932 int num_services; /* no of virtual services */ 933 934 rwlock_t rs_lock; /* real services table */ 935 /* Trash for destinations */ 936 struct list_head dest_trash; 937 /* Service counters */ 938 atomic_t ftpsvc_counter; 939 atomic_t nullsvc_counter; 940 941 #ifdef CONFIG_SYSCTL 942 /* 1/rate drop and drop-entry variables */ 943 struct delayed_work defense_work; /* Work handler */ 944 int drop_rate; 945 int drop_counter; 946 atomic_t dropentry; 947 /* locks in ctl.c */ 948 spinlock_t dropentry_lock; /* drop entry handling */ 949 spinlock_t droppacket_lock; /* drop packet handling */ 950 spinlock_t securetcp_lock; /* state and timeout tables */ 951 952 /* sys-ctl struct */ 953 struct ctl_table_header *sysctl_hdr; 954 struct ctl_table *sysctl_tbl; 955 #endif 956 957 /* sysctl variables */ 958 int sysctl_amemthresh; 959 int sysctl_am_droprate; 960 int sysctl_drop_entry; 961 int sysctl_drop_packet; 962 int sysctl_secure_tcp; 963 #ifdef CONFIG_IP_VS_NFCT 964 int sysctl_conntrack; 965 #endif 966 int sysctl_snat_reroute; 967 int sysctl_sync_ver; 968 int sysctl_sync_ports; 969 int sysctl_sync_qlen_max; 970 int sysctl_sync_sock_size; 971 int sysctl_cache_bypass; 972 int sysctl_expire_nodest_conn; 973 int sysctl_expire_quiescent_template; 974 int sysctl_sync_threshold[2]; 975 unsigned int sysctl_sync_refresh_period; 976 int sysctl_sync_retries; 977 int sysctl_nat_icmp_send; 978 int sysctl_pmtu_disc; 979 980 /* ip_vs_lblc */ 981 int sysctl_lblc_expiration; 982 struct ctl_table_header *lblc_ctl_header; 983 struct ctl_table *lblc_ctl_table; 984 /* ip_vs_lblcr */ 985 int sysctl_lblcr_expiration; 986 struct ctl_table_header *lblcr_ctl_header; 987 struct ctl_table *lblcr_ctl_table; 988 /* ip_vs_est */ 989 struct list_head est_list; /* estimator list */ 990 spinlock_t est_lock; 991 struct timer_list est_timer; /* Estimation timer */ 992 /* ip_vs_sync */ 993 spinlock_t sync_lock; 994 struct ipvs_master_sync_state *ms; 995 spinlock_t sync_buff_lock; 996 struct task_struct **backup_threads; 997 int threads_mask; 998 int send_mesg_maxlen; 999 int recv_mesg_maxlen; 1000 volatile int sync_state; 1001 volatile int master_syncid; 1002 volatile int backup_syncid; 1003 struct mutex sync_mutex; 1004 /* multicast interface name */ 1005 char master_mcast_ifn[IP_VS_IFNAME_MAXLEN]; 1006 char backup_mcast_ifn[IP_VS_IFNAME_MAXLEN]; 1007 /* net name space ptr */ 1008 struct net *net; /* Needed by timer routines */ 1009 }; 1010 1011 #define DEFAULT_SYNC_THRESHOLD 3 1012 #define DEFAULT_SYNC_PERIOD 50 1013 #define DEFAULT_SYNC_VER 1 1014 #define DEFAULT_SYNC_REFRESH_PERIOD (0U * HZ) 1015 #define DEFAULT_SYNC_RETRIES 0 1016 #define IPVS_SYNC_WAKEUP_RATE 8 1017 #define IPVS_SYNC_QLEN_MAX (IPVS_SYNC_WAKEUP_RATE * 4) 1018 #define IPVS_SYNC_SEND_DELAY (HZ / 50) 1019 #define IPVS_SYNC_CHECK_PERIOD HZ 1020 #define IPVS_SYNC_FLUSH_TIME (HZ * 2) 1021 #define IPVS_SYNC_PORTS_MAX (1 << 6) 1022 1023 #ifdef CONFIG_SYSCTL 1024 1025 static inline int sysctl_sync_threshold(struct netns_ipvs *ipvs) 1026 { 1027 return ipvs->sysctl_sync_threshold[0]; 1028 } 1029 1030 static inline int sysctl_sync_period(struct netns_ipvs *ipvs) 1031 { 1032 return ACCESS_ONCE(ipvs->sysctl_sync_threshold[1]); 1033 } 1034 1035 static inline unsigned int sysctl_sync_refresh_period(struct netns_ipvs *ipvs) 1036 { 1037 return ACCESS_ONCE(ipvs->sysctl_sync_refresh_period); 1038 } 1039 1040 static inline int sysctl_sync_retries(struct netns_ipvs *ipvs) 1041 { 1042 return ipvs->sysctl_sync_retries; 1043 } 1044 1045 static inline int sysctl_sync_ver(struct netns_ipvs *ipvs) 1046 { 1047 return ipvs->sysctl_sync_ver; 1048 } 1049 1050 static inline int sysctl_sync_ports(struct netns_ipvs *ipvs) 1051 { 1052 return ACCESS_ONCE(ipvs->sysctl_sync_ports); 1053 } 1054 1055 static inline int sysctl_sync_qlen_max(struct netns_ipvs *ipvs) 1056 { 1057 return ipvs->sysctl_sync_qlen_max; 1058 } 1059 1060 static inline int sysctl_sync_sock_size(struct netns_ipvs *ipvs) 1061 { 1062 return ipvs->sysctl_sync_sock_size; 1063 } 1064 1065 static inline int sysctl_pmtu_disc(struct netns_ipvs *ipvs) 1066 { 1067 return ipvs->sysctl_pmtu_disc; 1068 } 1069 1070 #else 1071 1072 static inline int sysctl_sync_threshold(struct netns_ipvs *ipvs) 1073 { 1074 return DEFAULT_SYNC_THRESHOLD; 1075 } 1076 1077 static inline int sysctl_sync_period(struct netns_ipvs *ipvs) 1078 { 1079 return DEFAULT_SYNC_PERIOD; 1080 } 1081 1082 static inline unsigned int sysctl_sync_refresh_period(struct netns_ipvs *ipvs) 1083 { 1084 return DEFAULT_SYNC_REFRESH_PERIOD; 1085 } 1086 1087 static inline int sysctl_sync_retries(struct netns_ipvs *ipvs) 1088 { 1089 return DEFAULT_SYNC_RETRIES & 3; 1090 } 1091 1092 static inline int sysctl_sync_ver(struct netns_ipvs *ipvs) 1093 { 1094 return DEFAULT_SYNC_VER; 1095 } 1096 1097 static inline int sysctl_sync_ports(struct netns_ipvs *ipvs) 1098 { 1099 return 1; 1100 } 1101 1102 static inline int sysctl_sync_qlen_max(struct netns_ipvs *ipvs) 1103 { 1104 return IPVS_SYNC_QLEN_MAX; 1105 } 1106 1107 static inline int sysctl_sync_sock_size(struct netns_ipvs *ipvs) 1108 { 1109 return 0; 1110 } 1111 1112 static inline int sysctl_pmtu_disc(struct netns_ipvs *ipvs) 1113 { 1114 return 1; 1115 } 1116 1117 #endif 1118 1119 /* 1120 * IPVS core functions 1121 * (from ip_vs_core.c) 1122 */ 1123 extern const char *ip_vs_proto_name(unsigned int proto); 1124 extern void ip_vs_init_hash_table(struct list_head *table, int rows); 1125 #define IP_VS_INIT_HASH_TABLE(t) ip_vs_init_hash_table((t), ARRAY_SIZE((t))) 1126 1127 #define IP_VS_APP_TYPE_FTP 1 1128 1129 /* 1130 * ip_vs_conn handling functions 1131 * (from ip_vs_conn.c) 1132 */ 1133 1134 enum { 1135 IP_VS_DIR_INPUT = 0, 1136 IP_VS_DIR_OUTPUT, 1137 IP_VS_DIR_INPUT_ONLY, 1138 IP_VS_DIR_LAST, 1139 }; 1140 1141 static inline void ip_vs_conn_fill_param(struct net *net, int af, int protocol, 1142 const union nf_inet_addr *caddr, 1143 __be16 cport, 1144 const union nf_inet_addr *vaddr, 1145 __be16 vport, 1146 struct ip_vs_conn_param *p) 1147 { 1148 p->net = net; 1149 p->af = af; 1150 p->protocol = protocol; 1151 p->caddr = caddr; 1152 p->cport = cport; 1153 p->vaddr = vaddr; 1154 p->vport = vport; 1155 p->pe = NULL; 1156 p->pe_data = NULL; 1157 } 1158 1159 struct ip_vs_conn *ip_vs_conn_in_get(const struct ip_vs_conn_param *p); 1160 struct ip_vs_conn *ip_vs_ct_in_get(const struct ip_vs_conn_param *p); 1161 1162 struct ip_vs_conn * ip_vs_conn_in_get_proto(int af, const struct sk_buff *skb, 1163 const struct ip_vs_iphdr *iph, 1164 int inverse); 1165 1166 struct ip_vs_conn *ip_vs_conn_out_get(const struct ip_vs_conn_param *p); 1167 1168 struct ip_vs_conn * ip_vs_conn_out_get_proto(int af, const struct sk_buff *skb, 1169 const struct ip_vs_iphdr *iph, 1170 int inverse); 1171 1172 /* put back the conn without restarting its timer */ 1173 static inline void __ip_vs_conn_put(struct ip_vs_conn *cp) 1174 { 1175 atomic_dec(&cp->refcnt); 1176 } 1177 extern void ip_vs_conn_put(struct ip_vs_conn *cp); 1178 extern void ip_vs_conn_fill_cport(struct ip_vs_conn *cp, __be16 cport); 1179 1180 struct ip_vs_conn *ip_vs_conn_new(const struct ip_vs_conn_param *p, 1181 const union nf_inet_addr *daddr, 1182 __be16 dport, unsigned int flags, 1183 struct ip_vs_dest *dest, __u32 fwmark); 1184 extern void ip_vs_conn_expire_now(struct ip_vs_conn *cp); 1185 1186 extern const char * ip_vs_state_name(__u16 proto, int state); 1187 1188 extern void ip_vs_tcp_conn_listen(struct net *net, struct ip_vs_conn *cp); 1189 extern int ip_vs_check_template(struct ip_vs_conn *ct); 1190 extern void ip_vs_random_dropentry(struct net *net); 1191 extern int ip_vs_conn_init(void); 1192 extern void ip_vs_conn_cleanup(void); 1193 1194 static inline void ip_vs_control_del(struct ip_vs_conn *cp) 1195 { 1196 struct ip_vs_conn *ctl_cp = cp->control; 1197 if (!ctl_cp) { 1198 IP_VS_ERR_BUF("request control DEL for uncontrolled: " 1199 "%s:%d to %s:%d\n", 1200 IP_VS_DBG_ADDR(cp->af, &cp->caddr), 1201 ntohs(cp->cport), 1202 IP_VS_DBG_ADDR(cp->af, &cp->vaddr), 1203 ntohs(cp->vport)); 1204 1205 return; 1206 } 1207 1208 IP_VS_DBG_BUF(7, "DELeting control for: " 1209 "cp.dst=%s:%d ctl_cp.dst=%s:%d\n", 1210 IP_VS_DBG_ADDR(cp->af, &cp->caddr), 1211 ntohs(cp->cport), 1212 IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr), 1213 ntohs(ctl_cp->cport)); 1214 1215 cp->control = NULL; 1216 if (atomic_read(&ctl_cp->n_control) == 0) { 1217 IP_VS_ERR_BUF("BUG control DEL with n=0 : " 1218 "%s:%d to %s:%d\n", 1219 IP_VS_DBG_ADDR(cp->af, &cp->caddr), 1220 ntohs(cp->cport), 1221 IP_VS_DBG_ADDR(cp->af, &cp->vaddr), 1222 ntohs(cp->vport)); 1223 1224 return; 1225 } 1226 atomic_dec(&ctl_cp->n_control); 1227 } 1228 1229 static inline void 1230 ip_vs_control_add(struct ip_vs_conn *cp, struct ip_vs_conn *ctl_cp) 1231 { 1232 if (cp->control) { 1233 IP_VS_ERR_BUF("request control ADD for already controlled: " 1234 "%s:%d to %s:%d\n", 1235 IP_VS_DBG_ADDR(cp->af, &cp->caddr), 1236 ntohs(cp->cport), 1237 IP_VS_DBG_ADDR(cp->af, &cp->vaddr), 1238 ntohs(cp->vport)); 1239 1240 ip_vs_control_del(cp); 1241 } 1242 1243 IP_VS_DBG_BUF(7, "ADDing control for: " 1244 "cp.dst=%s:%d ctl_cp.dst=%s:%d\n", 1245 IP_VS_DBG_ADDR(cp->af, &cp->caddr), 1246 ntohs(cp->cport), 1247 IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr), 1248 ntohs(ctl_cp->cport)); 1249 1250 cp->control = ctl_cp; 1251 atomic_inc(&ctl_cp->n_control); 1252 } 1253 1254 /* 1255 * IPVS netns init & cleanup functions 1256 */ 1257 extern int ip_vs_estimator_net_init(struct net *net); 1258 extern int ip_vs_control_net_init(struct net *net); 1259 extern int ip_vs_protocol_net_init(struct net *net); 1260 extern int ip_vs_app_net_init(struct net *net); 1261 extern int ip_vs_conn_net_init(struct net *net); 1262 extern int ip_vs_sync_net_init(struct net *net); 1263 extern void ip_vs_conn_net_cleanup(struct net *net); 1264 extern void ip_vs_app_net_cleanup(struct net *net); 1265 extern void ip_vs_protocol_net_cleanup(struct net *net); 1266 extern void ip_vs_control_net_cleanup(struct net *net); 1267 extern void ip_vs_estimator_net_cleanup(struct net *net); 1268 extern void ip_vs_sync_net_cleanup(struct net *net); 1269 extern void ip_vs_service_net_cleanup(struct net *net); 1270 1271 /* 1272 * IPVS application functions 1273 * (from ip_vs_app.c) 1274 */ 1275 #define IP_VS_APP_MAX_PORTS 8 1276 extern struct ip_vs_app *register_ip_vs_app(struct net *net, 1277 struct ip_vs_app *app); 1278 extern void unregister_ip_vs_app(struct net *net, struct ip_vs_app *app); 1279 extern int ip_vs_bind_app(struct ip_vs_conn *cp, struct ip_vs_protocol *pp); 1280 extern void ip_vs_unbind_app(struct ip_vs_conn *cp); 1281 extern int register_ip_vs_app_inc(struct net *net, struct ip_vs_app *app, 1282 __u16 proto, __u16 port); 1283 extern int ip_vs_app_inc_get(struct ip_vs_app *inc); 1284 extern void ip_vs_app_inc_put(struct ip_vs_app *inc); 1285 1286 extern int ip_vs_app_pkt_out(struct ip_vs_conn *, struct sk_buff *skb); 1287 extern int ip_vs_app_pkt_in(struct ip_vs_conn *, struct sk_buff *skb); 1288 1289 void ip_vs_bind_pe(struct ip_vs_service *svc, struct ip_vs_pe *pe); 1290 void ip_vs_unbind_pe(struct ip_vs_service *svc); 1291 int register_ip_vs_pe(struct ip_vs_pe *pe); 1292 int unregister_ip_vs_pe(struct ip_vs_pe *pe); 1293 struct ip_vs_pe *ip_vs_pe_getbyname(const char *name); 1294 struct ip_vs_pe *__ip_vs_pe_getbyname(const char *pe_name); 1295 1296 /* 1297 * Use a #define to avoid all of module.h just for these trivial ops 1298 */ 1299 #define ip_vs_pe_get(pe) \ 1300 if (pe && pe->module) \ 1301 __module_get(pe->module); 1302 1303 #define ip_vs_pe_put(pe) \ 1304 if (pe && pe->module) \ 1305 module_put(pe->module); 1306 1307 /* 1308 * IPVS protocol functions (from ip_vs_proto.c) 1309 */ 1310 extern int ip_vs_protocol_init(void); 1311 extern void ip_vs_protocol_cleanup(void); 1312 extern void ip_vs_protocol_timeout_change(struct netns_ipvs *ipvs, int flags); 1313 extern int *ip_vs_create_timeout_table(int *table, int size); 1314 extern int 1315 ip_vs_set_state_timeout(int *table, int num, const char *const *names, 1316 const char *name, int to); 1317 extern void 1318 ip_vs_tcpudp_debug_packet(int af, struct ip_vs_protocol *pp, 1319 const struct sk_buff *skb, 1320 int offset, const char *msg); 1321 1322 extern struct ip_vs_protocol ip_vs_protocol_tcp; 1323 extern struct ip_vs_protocol ip_vs_protocol_udp; 1324 extern struct ip_vs_protocol ip_vs_protocol_icmp; 1325 extern struct ip_vs_protocol ip_vs_protocol_esp; 1326 extern struct ip_vs_protocol ip_vs_protocol_ah; 1327 extern struct ip_vs_protocol ip_vs_protocol_sctp; 1328 1329 /* 1330 * Registering/unregistering scheduler functions 1331 * (from ip_vs_sched.c) 1332 */ 1333 extern int register_ip_vs_scheduler(struct ip_vs_scheduler *scheduler); 1334 extern int unregister_ip_vs_scheduler(struct ip_vs_scheduler *scheduler); 1335 extern int ip_vs_bind_scheduler(struct ip_vs_service *svc, 1336 struct ip_vs_scheduler *scheduler); 1337 extern int ip_vs_unbind_scheduler(struct ip_vs_service *svc); 1338 extern struct ip_vs_scheduler *ip_vs_scheduler_get(const char *sched_name); 1339 extern void ip_vs_scheduler_put(struct ip_vs_scheduler *scheduler); 1340 extern struct ip_vs_conn * 1341 ip_vs_schedule(struct ip_vs_service *svc, struct sk_buff *skb, 1342 struct ip_vs_proto_data *pd, int *ignored, 1343 struct ip_vs_iphdr *iph); 1344 extern int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb, 1345 struct ip_vs_proto_data *pd, struct ip_vs_iphdr *iph); 1346 1347 extern void ip_vs_scheduler_err(struct ip_vs_service *svc, const char *msg); 1348 1349 1350 /* 1351 * IPVS control data and functions (from ip_vs_ctl.c) 1352 */ 1353 extern struct ip_vs_stats ip_vs_stats; 1354 extern int sysctl_ip_vs_sync_ver; 1355 1356 extern struct ip_vs_service * 1357 ip_vs_service_get(struct net *net, int af, __u32 fwmark, __u16 protocol, 1358 const union nf_inet_addr *vaddr, __be16 vport); 1359 1360 static inline void ip_vs_service_put(struct ip_vs_service *svc) 1361 { 1362 atomic_dec(&svc->usecnt); 1363 } 1364 1365 extern struct ip_vs_dest * 1366 ip_vs_lookup_real_service(struct net *net, int af, __u16 protocol, 1367 const union nf_inet_addr *daddr, __be16 dport); 1368 1369 extern int ip_vs_use_count_inc(void); 1370 extern void ip_vs_use_count_dec(void); 1371 extern int ip_vs_register_nl_ioctl(void); 1372 extern void ip_vs_unregister_nl_ioctl(void); 1373 extern int ip_vs_control_init(void); 1374 extern void ip_vs_control_cleanup(void); 1375 extern struct ip_vs_dest * 1376 ip_vs_find_dest(struct net *net, int af, const union nf_inet_addr *daddr, 1377 __be16 dport, const union nf_inet_addr *vaddr, __be16 vport, 1378 __u16 protocol, __u32 fwmark, __u32 flags); 1379 extern struct ip_vs_dest *ip_vs_try_bind_dest(struct ip_vs_conn *cp); 1380 1381 1382 /* 1383 * IPVS sync daemon data and function prototypes 1384 * (from ip_vs_sync.c) 1385 */ 1386 extern int start_sync_thread(struct net *net, int state, char *mcast_ifn, 1387 __u8 syncid); 1388 extern int stop_sync_thread(struct net *net, int state); 1389 extern void ip_vs_sync_conn(struct net *net, struct ip_vs_conn *cp, int pkts); 1390 1391 1392 /* 1393 * IPVS rate estimator prototypes (from ip_vs_est.c) 1394 */ 1395 extern void ip_vs_start_estimator(struct net *net, struct ip_vs_stats *stats); 1396 extern void ip_vs_stop_estimator(struct net *net, struct ip_vs_stats *stats); 1397 extern void ip_vs_zero_estimator(struct ip_vs_stats *stats); 1398 extern void ip_vs_read_estimator(struct ip_vs_stats_user *dst, 1399 struct ip_vs_stats *stats); 1400 1401 /* 1402 * Various IPVS packet transmitters (from ip_vs_xmit.c) 1403 */ 1404 extern int ip_vs_null_xmit(struct sk_buff *skb, struct ip_vs_conn *cp, 1405 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph); 1406 extern int ip_vs_bypass_xmit(struct sk_buff *skb, struct ip_vs_conn *cp, 1407 struct ip_vs_protocol *pp, 1408 struct ip_vs_iphdr *iph); 1409 extern int ip_vs_nat_xmit(struct sk_buff *skb, struct ip_vs_conn *cp, 1410 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph); 1411 extern int ip_vs_tunnel_xmit(struct sk_buff *skb, struct ip_vs_conn *cp, 1412 struct ip_vs_protocol *pp, 1413 struct ip_vs_iphdr *iph); 1414 extern int ip_vs_dr_xmit(struct sk_buff *skb, struct ip_vs_conn *cp, 1415 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph); 1416 extern int ip_vs_icmp_xmit(struct sk_buff *skb, struct ip_vs_conn *cp, 1417 struct ip_vs_protocol *pp, int offset, 1418 unsigned int hooknum, struct ip_vs_iphdr *iph); 1419 extern void ip_vs_dst_reset(struct ip_vs_dest *dest); 1420 1421 #ifdef CONFIG_IP_VS_IPV6 1422 extern int ip_vs_bypass_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp, 1423 struct ip_vs_protocol *pp, 1424 struct ip_vs_iphdr *iph); 1425 extern int ip_vs_nat_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp, 1426 struct ip_vs_protocol *pp, 1427 struct ip_vs_iphdr *iph); 1428 extern int ip_vs_tunnel_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp, 1429 struct ip_vs_protocol *pp, 1430 struct ip_vs_iphdr *iph); 1431 extern int ip_vs_dr_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp, 1432 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph); 1433 extern int ip_vs_icmp_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp, 1434 struct ip_vs_protocol *pp, int offset, 1435 unsigned int hooknum, struct ip_vs_iphdr *iph); 1436 #endif 1437 1438 #ifdef CONFIG_SYSCTL 1439 /* 1440 * This is a simple mechanism to ignore packets when 1441 * we are loaded. Just set ip_vs_drop_rate to 'n' and 1442 * we start to drop 1/rate of the packets 1443 */ 1444 1445 static inline int ip_vs_todrop(struct netns_ipvs *ipvs) 1446 { 1447 if (!ipvs->drop_rate) 1448 return 0; 1449 if (--ipvs->drop_counter > 0) 1450 return 0; 1451 ipvs->drop_counter = ipvs->drop_rate; 1452 return 1; 1453 } 1454 #else 1455 static inline int ip_vs_todrop(struct netns_ipvs *ipvs) { return 0; } 1456 #endif 1457 1458 /* 1459 * ip_vs_fwd_tag returns the forwarding tag of the connection 1460 */ 1461 #define IP_VS_FWD_METHOD(cp) (cp->flags & IP_VS_CONN_F_FWD_MASK) 1462 1463 static inline char ip_vs_fwd_tag(struct ip_vs_conn *cp) 1464 { 1465 char fwd; 1466 1467 switch (IP_VS_FWD_METHOD(cp)) { 1468 case IP_VS_CONN_F_MASQ: 1469 fwd = 'M'; break; 1470 case IP_VS_CONN_F_LOCALNODE: 1471 fwd = 'L'; break; 1472 case IP_VS_CONN_F_TUNNEL: 1473 fwd = 'T'; break; 1474 case IP_VS_CONN_F_DROUTE: 1475 fwd = 'R'; break; 1476 case IP_VS_CONN_F_BYPASS: 1477 fwd = 'B'; break; 1478 default: 1479 fwd = '?'; break; 1480 } 1481 return fwd; 1482 } 1483 1484 extern void ip_vs_nat_icmp(struct sk_buff *skb, struct ip_vs_protocol *pp, 1485 struct ip_vs_conn *cp, int dir); 1486 1487 #ifdef CONFIG_IP_VS_IPV6 1488 extern void ip_vs_nat_icmp_v6(struct sk_buff *skb, struct ip_vs_protocol *pp, 1489 struct ip_vs_conn *cp, int dir); 1490 #endif 1491 1492 extern __sum16 ip_vs_checksum_complete(struct sk_buff *skb, int offset); 1493 1494 static inline __wsum ip_vs_check_diff4(__be32 old, __be32 new, __wsum oldsum) 1495 { 1496 __be32 diff[2] = { ~old, new }; 1497 1498 return csum_partial(diff, sizeof(diff), oldsum); 1499 } 1500 1501 #ifdef CONFIG_IP_VS_IPV6 1502 static inline __wsum ip_vs_check_diff16(const __be32 *old, const __be32 *new, 1503 __wsum oldsum) 1504 { 1505 __be32 diff[8] = { ~old[3], ~old[2], ~old[1], ~old[0], 1506 new[3], new[2], new[1], new[0] }; 1507 1508 return csum_partial(diff, sizeof(diff), oldsum); 1509 } 1510 #endif 1511 1512 static inline __wsum ip_vs_check_diff2(__be16 old, __be16 new, __wsum oldsum) 1513 { 1514 __be16 diff[2] = { ~old, new }; 1515 1516 return csum_partial(diff, sizeof(diff), oldsum); 1517 } 1518 1519 /* 1520 * Forget current conntrack (unconfirmed) and attach notrack entry 1521 */ 1522 static inline void ip_vs_notrack(struct sk_buff *skb) 1523 { 1524 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) 1525 enum ip_conntrack_info ctinfo; 1526 struct nf_conn *ct = nf_ct_get(skb, &ctinfo); 1527 1528 if (!ct || !nf_ct_is_untracked(ct)) { 1529 nf_conntrack_put(skb->nfct); 1530 skb->nfct = &nf_ct_untracked_get()->ct_general; 1531 skb->nfctinfo = IP_CT_NEW; 1532 nf_conntrack_get(skb->nfct); 1533 } 1534 #endif 1535 } 1536 1537 #ifdef CONFIG_IP_VS_NFCT 1538 /* 1539 * Netfilter connection tracking 1540 * (from ip_vs_nfct.c) 1541 */ 1542 static inline int ip_vs_conntrack_enabled(struct netns_ipvs *ipvs) 1543 { 1544 #ifdef CONFIG_SYSCTL 1545 return ipvs->sysctl_conntrack; 1546 #else 1547 return 0; 1548 #endif 1549 } 1550 1551 extern void ip_vs_update_conntrack(struct sk_buff *skb, struct ip_vs_conn *cp, 1552 int outin); 1553 extern int ip_vs_confirm_conntrack(struct sk_buff *skb); 1554 extern void ip_vs_nfct_expect_related(struct sk_buff *skb, struct nf_conn *ct, 1555 struct ip_vs_conn *cp, u_int8_t proto, 1556 const __be16 port, int from_rs); 1557 extern void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp); 1558 1559 #else 1560 1561 static inline int ip_vs_conntrack_enabled(struct netns_ipvs *ipvs) 1562 { 1563 return 0; 1564 } 1565 1566 static inline void ip_vs_update_conntrack(struct sk_buff *skb, 1567 struct ip_vs_conn *cp, int outin) 1568 { 1569 } 1570 1571 static inline int ip_vs_confirm_conntrack(struct sk_buff *skb) 1572 { 1573 return NF_ACCEPT; 1574 } 1575 1576 static inline void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp) 1577 { 1578 } 1579 /* CONFIG_IP_VS_NFCT */ 1580 #endif 1581 1582 static inline unsigned int 1583 ip_vs_dest_conn_overhead(struct ip_vs_dest *dest) 1584 { 1585 /* 1586 * We think the overhead of processing active connections is 256 1587 * times higher than that of inactive connections in average. (This 1588 * 256 times might not be accurate, we will change it later) We 1589 * use the following formula to estimate the overhead now: 1590 * dest->activeconns*256 + dest->inactconns 1591 */ 1592 return (atomic_read(&dest->activeconns) << 8) + 1593 atomic_read(&dest->inactconns); 1594 } 1595 1596 #endif /* _NET_IP_VS_H */ 1597