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 int sysctl_backup_only; 980 981 /* ip_vs_lblc */ 982 int sysctl_lblc_expiration; 983 struct ctl_table_header *lblc_ctl_header; 984 struct ctl_table *lblc_ctl_table; 985 /* ip_vs_lblcr */ 986 int sysctl_lblcr_expiration; 987 struct ctl_table_header *lblcr_ctl_header; 988 struct ctl_table *lblcr_ctl_table; 989 /* ip_vs_est */ 990 struct list_head est_list; /* estimator list */ 991 spinlock_t est_lock; 992 struct timer_list est_timer; /* Estimation timer */ 993 /* ip_vs_sync */ 994 spinlock_t sync_lock; 995 struct ipvs_master_sync_state *ms; 996 spinlock_t sync_buff_lock; 997 struct task_struct **backup_threads; 998 int threads_mask; 999 int send_mesg_maxlen; 1000 int recv_mesg_maxlen; 1001 volatile int sync_state; 1002 volatile int master_syncid; 1003 volatile int backup_syncid; 1004 struct mutex sync_mutex; 1005 /* multicast interface name */ 1006 char master_mcast_ifn[IP_VS_IFNAME_MAXLEN]; 1007 char backup_mcast_ifn[IP_VS_IFNAME_MAXLEN]; 1008 /* net name space ptr */ 1009 struct net *net; /* Needed by timer routines */ 1010 }; 1011 1012 #define DEFAULT_SYNC_THRESHOLD 3 1013 #define DEFAULT_SYNC_PERIOD 50 1014 #define DEFAULT_SYNC_VER 1 1015 #define DEFAULT_SYNC_REFRESH_PERIOD (0U * HZ) 1016 #define DEFAULT_SYNC_RETRIES 0 1017 #define IPVS_SYNC_WAKEUP_RATE 8 1018 #define IPVS_SYNC_QLEN_MAX (IPVS_SYNC_WAKEUP_RATE * 4) 1019 #define IPVS_SYNC_SEND_DELAY (HZ / 50) 1020 #define IPVS_SYNC_CHECK_PERIOD HZ 1021 #define IPVS_SYNC_FLUSH_TIME (HZ * 2) 1022 #define IPVS_SYNC_PORTS_MAX (1 << 6) 1023 1024 #ifdef CONFIG_SYSCTL 1025 1026 static inline int sysctl_sync_threshold(struct netns_ipvs *ipvs) 1027 { 1028 return ipvs->sysctl_sync_threshold[0]; 1029 } 1030 1031 static inline int sysctl_sync_period(struct netns_ipvs *ipvs) 1032 { 1033 return ACCESS_ONCE(ipvs->sysctl_sync_threshold[1]); 1034 } 1035 1036 static inline unsigned int sysctl_sync_refresh_period(struct netns_ipvs *ipvs) 1037 { 1038 return ACCESS_ONCE(ipvs->sysctl_sync_refresh_period); 1039 } 1040 1041 static inline int sysctl_sync_retries(struct netns_ipvs *ipvs) 1042 { 1043 return ipvs->sysctl_sync_retries; 1044 } 1045 1046 static inline int sysctl_sync_ver(struct netns_ipvs *ipvs) 1047 { 1048 return ipvs->sysctl_sync_ver; 1049 } 1050 1051 static inline int sysctl_sync_ports(struct netns_ipvs *ipvs) 1052 { 1053 return ACCESS_ONCE(ipvs->sysctl_sync_ports); 1054 } 1055 1056 static inline int sysctl_sync_qlen_max(struct netns_ipvs *ipvs) 1057 { 1058 return ipvs->sysctl_sync_qlen_max; 1059 } 1060 1061 static inline int sysctl_sync_sock_size(struct netns_ipvs *ipvs) 1062 { 1063 return ipvs->sysctl_sync_sock_size; 1064 } 1065 1066 static inline int sysctl_pmtu_disc(struct netns_ipvs *ipvs) 1067 { 1068 return ipvs->sysctl_pmtu_disc; 1069 } 1070 1071 static inline int sysctl_backup_only(struct netns_ipvs *ipvs) 1072 { 1073 return ipvs->sync_state & IP_VS_STATE_BACKUP && 1074 ipvs->sysctl_backup_only; 1075 } 1076 1077 #else 1078 1079 static inline int sysctl_sync_threshold(struct netns_ipvs *ipvs) 1080 { 1081 return DEFAULT_SYNC_THRESHOLD; 1082 } 1083 1084 static inline int sysctl_sync_period(struct netns_ipvs *ipvs) 1085 { 1086 return DEFAULT_SYNC_PERIOD; 1087 } 1088 1089 static inline unsigned int sysctl_sync_refresh_period(struct netns_ipvs *ipvs) 1090 { 1091 return DEFAULT_SYNC_REFRESH_PERIOD; 1092 } 1093 1094 static inline int sysctl_sync_retries(struct netns_ipvs *ipvs) 1095 { 1096 return DEFAULT_SYNC_RETRIES & 3; 1097 } 1098 1099 static inline int sysctl_sync_ver(struct netns_ipvs *ipvs) 1100 { 1101 return DEFAULT_SYNC_VER; 1102 } 1103 1104 static inline int sysctl_sync_ports(struct netns_ipvs *ipvs) 1105 { 1106 return 1; 1107 } 1108 1109 static inline int sysctl_sync_qlen_max(struct netns_ipvs *ipvs) 1110 { 1111 return IPVS_SYNC_QLEN_MAX; 1112 } 1113 1114 static inline int sysctl_sync_sock_size(struct netns_ipvs *ipvs) 1115 { 1116 return 0; 1117 } 1118 1119 static inline int sysctl_pmtu_disc(struct netns_ipvs *ipvs) 1120 { 1121 return 1; 1122 } 1123 1124 static inline int sysctl_backup_only(struct netns_ipvs *ipvs) 1125 { 1126 return 0; 1127 } 1128 1129 #endif 1130 1131 /* 1132 * IPVS core functions 1133 * (from ip_vs_core.c) 1134 */ 1135 extern const char *ip_vs_proto_name(unsigned int proto); 1136 extern void ip_vs_init_hash_table(struct list_head *table, int rows); 1137 #define IP_VS_INIT_HASH_TABLE(t) ip_vs_init_hash_table((t), ARRAY_SIZE((t))) 1138 1139 #define IP_VS_APP_TYPE_FTP 1 1140 1141 /* 1142 * ip_vs_conn handling functions 1143 * (from ip_vs_conn.c) 1144 */ 1145 1146 enum { 1147 IP_VS_DIR_INPUT = 0, 1148 IP_VS_DIR_OUTPUT, 1149 IP_VS_DIR_INPUT_ONLY, 1150 IP_VS_DIR_LAST, 1151 }; 1152 1153 static inline void ip_vs_conn_fill_param(struct net *net, int af, int protocol, 1154 const union nf_inet_addr *caddr, 1155 __be16 cport, 1156 const union nf_inet_addr *vaddr, 1157 __be16 vport, 1158 struct ip_vs_conn_param *p) 1159 { 1160 p->net = net; 1161 p->af = af; 1162 p->protocol = protocol; 1163 p->caddr = caddr; 1164 p->cport = cport; 1165 p->vaddr = vaddr; 1166 p->vport = vport; 1167 p->pe = NULL; 1168 p->pe_data = NULL; 1169 } 1170 1171 struct ip_vs_conn *ip_vs_conn_in_get(const struct ip_vs_conn_param *p); 1172 struct ip_vs_conn *ip_vs_ct_in_get(const struct ip_vs_conn_param *p); 1173 1174 struct ip_vs_conn * ip_vs_conn_in_get_proto(int af, const struct sk_buff *skb, 1175 const struct ip_vs_iphdr *iph, 1176 int inverse); 1177 1178 struct ip_vs_conn *ip_vs_conn_out_get(const struct ip_vs_conn_param *p); 1179 1180 struct ip_vs_conn * ip_vs_conn_out_get_proto(int af, const struct sk_buff *skb, 1181 const struct ip_vs_iphdr *iph, 1182 int inverse); 1183 1184 /* put back the conn without restarting its timer */ 1185 static inline void __ip_vs_conn_put(struct ip_vs_conn *cp) 1186 { 1187 atomic_dec(&cp->refcnt); 1188 } 1189 extern void ip_vs_conn_put(struct ip_vs_conn *cp); 1190 extern void ip_vs_conn_fill_cport(struct ip_vs_conn *cp, __be16 cport); 1191 1192 struct ip_vs_conn *ip_vs_conn_new(const struct ip_vs_conn_param *p, 1193 const union nf_inet_addr *daddr, 1194 __be16 dport, unsigned int flags, 1195 struct ip_vs_dest *dest, __u32 fwmark); 1196 extern void ip_vs_conn_expire_now(struct ip_vs_conn *cp); 1197 1198 extern const char * ip_vs_state_name(__u16 proto, int state); 1199 1200 extern void ip_vs_tcp_conn_listen(struct net *net, struct ip_vs_conn *cp); 1201 extern int ip_vs_check_template(struct ip_vs_conn *ct); 1202 extern void ip_vs_random_dropentry(struct net *net); 1203 extern int ip_vs_conn_init(void); 1204 extern void ip_vs_conn_cleanup(void); 1205 1206 static inline void ip_vs_control_del(struct ip_vs_conn *cp) 1207 { 1208 struct ip_vs_conn *ctl_cp = cp->control; 1209 if (!ctl_cp) { 1210 IP_VS_ERR_BUF("request control DEL for uncontrolled: " 1211 "%s:%d to %s:%d\n", 1212 IP_VS_DBG_ADDR(cp->af, &cp->caddr), 1213 ntohs(cp->cport), 1214 IP_VS_DBG_ADDR(cp->af, &cp->vaddr), 1215 ntohs(cp->vport)); 1216 1217 return; 1218 } 1219 1220 IP_VS_DBG_BUF(7, "DELeting control for: " 1221 "cp.dst=%s:%d ctl_cp.dst=%s:%d\n", 1222 IP_VS_DBG_ADDR(cp->af, &cp->caddr), 1223 ntohs(cp->cport), 1224 IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr), 1225 ntohs(ctl_cp->cport)); 1226 1227 cp->control = NULL; 1228 if (atomic_read(&ctl_cp->n_control) == 0) { 1229 IP_VS_ERR_BUF("BUG control DEL with n=0 : " 1230 "%s:%d to %s:%d\n", 1231 IP_VS_DBG_ADDR(cp->af, &cp->caddr), 1232 ntohs(cp->cport), 1233 IP_VS_DBG_ADDR(cp->af, &cp->vaddr), 1234 ntohs(cp->vport)); 1235 1236 return; 1237 } 1238 atomic_dec(&ctl_cp->n_control); 1239 } 1240 1241 static inline void 1242 ip_vs_control_add(struct ip_vs_conn *cp, struct ip_vs_conn *ctl_cp) 1243 { 1244 if (cp->control) { 1245 IP_VS_ERR_BUF("request control ADD for already controlled: " 1246 "%s:%d to %s:%d\n", 1247 IP_VS_DBG_ADDR(cp->af, &cp->caddr), 1248 ntohs(cp->cport), 1249 IP_VS_DBG_ADDR(cp->af, &cp->vaddr), 1250 ntohs(cp->vport)); 1251 1252 ip_vs_control_del(cp); 1253 } 1254 1255 IP_VS_DBG_BUF(7, "ADDing control for: " 1256 "cp.dst=%s:%d ctl_cp.dst=%s:%d\n", 1257 IP_VS_DBG_ADDR(cp->af, &cp->caddr), 1258 ntohs(cp->cport), 1259 IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr), 1260 ntohs(ctl_cp->cport)); 1261 1262 cp->control = ctl_cp; 1263 atomic_inc(&ctl_cp->n_control); 1264 } 1265 1266 /* 1267 * IPVS netns init & cleanup functions 1268 */ 1269 extern int ip_vs_estimator_net_init(struct net *net); 1270 extern int ip_vs_control_net_init(struct net *net); 1271 extern int ip_vs_protocol_net_init(struct net *net); 1272 extern int ip_vs_app_net_init(struct net *net); 1273 extern int ip_vs_conn_net_init(struct net *net); 1274 extern int ip_vs_sync_net_init(struct net *net); 1275 extern void ip_vs_conn_net_cleanup(struct net *net); 1276 extern void ip_vs_app_net_cleanup(struct net *net); 1277 extern void ip_vs_protocol_net_cleanup(struct net *net); 1278 extern void ip_vs_control_net_cleanup(struct net *net); 1279 extern void ip_vs_estimator_net_cleanup(struct net *net); 1280 extern void ip_vs_sync_net_cleanup(struct net *net); 1281 extern void ip_vs_service_net_cleanup(struct net *net); 1282 1283 /* 1284 * IPVS application functions 1285 * (from ip_vs_app.c) 1286 */ 1287 #define IP_VS_APP_MAX_PORTS 8 1288 extern struct ip_vs_app *register_ip_vs_app(struct net *net, 1289 struct ip_vs_app *app); 1290 extern void unregister_ip_vs_app(struct net *net, struct ip_vs_app *app); 1291 extern int ip_vs_bind_app(struct ip_vs_conn *cp, struct ip_vs_protocol *pp); 1292 extern void ip_vs_unbind_app(struct ip_vs_conn *cp); 1293 extern int register_ip_vs_app_inc(struct net *net, struct ip_vs_app *app, 1294 __u16 proto, __u16 port); 1295 extern int ip_vs_app_inc_get(struct ip_vs_app *inc); 1296 extern void ip_vs_app_inc_put(struct ip_vs_app *inc); 1297 1298 extern int ip_vs_app_pkt_out(struct ip_vs_conn *, struct sk_buff *skb); 1299 extern int ip_vs_app_pkt_in(struct ip_vs_conn *, struct sk_buff *skb); 1300 1301 void ip_vs_bind_pe(struct ip_vs_service *svc, struct ip_vs_pe *pe); 1302 void ip_vs_unbind_pe(struct ip_vs_service *svc); 1303 int register_ip_vs_pe(struct ip_vs_pe *pe); 1304 int unregister_ip_vs_pe(struct ip_vs_pe *pe); 1305 struct ip_vs_pe *ip_vs_pe_getbyname(const char *name); 1306 struct ip_vs_pe *__ip_vs_pe_getbyname(const char *pe_name); 1307 1308 /* 1309 * Use a #define to avoid all of module.h just for these trivial ops 1310 */ 1311 #define ip_vs_pe_get(pe) \ 1312 if (pe && pe->module) \ 1313 __module_get(pe->module); 1314 1315 #define ip_vs_pe_put(pe) \ 1316 if (pe && pe->module) \ 1317 module_put(pe->module); 1318 1319 /* 1320 * IPVS protocol functions (from ip_vs_proto.c) 1321 */ 1322 extern int ip_vs_protocol_init(void); 1323 extern void ip_vs_protocol_cleanup(void); 1324 extern void ip_vs_protocol_timeout_change(struct netns_ipvs *ipvs, int flags); 1325 extern int *ip_vs_create_timeout_table(int *table, int size); 1326 extern int 1327 ip_vs_set_state_timeout(int *table, int num, const char *const *names, 1328 const char *name, int to); 1329 extern void 1330 ip_vs_tcpudp_debug_packet(int af, struct ip_vs_protocol *pp, 1331 const struct sk_buff *skb, 1332 int offset, const char *msg); 1333 1334 extern struct ip_vs_protocol ip_vs_protocol_tcp; 1335 extern struct ip_vs_protocol ip_vs_protocol_udp; 1336 extern struct ip_vs_protocol ip_vs_protocol_icmp; 1337 extern struct ip_vs_protocol ip_vs_protocol_esp; 1338 extern struct ip_vs_protocol ip_vs_protocol_ah; 1339 extern struct ip_vs_protocol ip_vs_protocol_sctp; 1340 1341 /* 1342 * Registering/unregistering scheduler functions 1343 * (from ip_vs_sched.c) 1344 */ 1345 extern int register_ip_vs_scheduler(struct ip_vs_scheduler *scheduler); 1346 extern int unregister_ip_vs_scheduler(struct ip_vs_scheduler *scheduler); 1347 extern int ip_vs_bind_scheduler(struct ip_vs_service *svc, 1348 struct ip_vs_scheduler *scheduler); 1349 extern int ip_vs_unbind_scheduler(struct ip_vs_service *svc); 1350 extern struct ip_vs_scheduler *ip_vs_scheduler_get(const char *sched_name); 1351 extern void ip_vs_scheduler_put(struct ip_vs_scheduler *scheduler); 1352 extern struct ip_vs_conn * 1353 ip_vs_schedule(struct ip_vs_service *svc, struct sk_buff *skb, 1354 struct ip_vs_proto_data *pd, int *ignored, 1355 struct ip_vs_iphdr *iph); 1356 extern int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb, 1357 struct ip_vs_proto_data *pd, struct ip_vs_iphdr *iph); 1358 1359 extern void ip_vs_scheduler_err(struct ip_vs_service *svc, const char *msg); 1360 1361 1362 /* 1363 * IPVS control data and functions (from ip_vs_ctl.c) 1364 */ 1365 extern struct ip_vs_stats ip_vs_stats; 1366 extern int sysctl_ip_vs_sync_ver; 1367 1368 extern struct ip_vs_service * 1369 ip_vs_service_get(struct net *net, int af, __u32 fwmark, __u16 protocol, 1370 const union nf_inet_addr *vaddr, __be16 vport); 1371 1372 static inline void ip_vs_service_put(struct ip_vs_service *svc) 1373 { 1374 atomic_dec(&svc->usecnt); 1375 } 1376 1377 extern struct ip_vs_dest * 1378 ip_vs_lookup_real_service(struct net *net, int af, __u16 protocol, 1379 const union nf_inet_addr *daddr, __be16 dport); 1380 1381 extern int ip_vs_use_count_inc(void); 1382 extern void ip_vs_use_count_dec(void); 1383 extern int ip_vs_register_nl_ioctl(void); 1384 extern void ip_vs_unregister_nl_ioctl(void); 1385 extern int ip_vs_control_init(void); 1386 extern void ip_vs_control_cleanup(void); 1387 extern struct ip_vs_dest * 1388 ip_vs_find_dest(struct net *net, int af, const union nf_inet_addr *daddr, 1389 __be16 dport, const union nf_inet_addr *vaddr, __be16 vport, 1390 __u16 protocol, __u32 fwmark, __u32 flags); 1391 extern struct ip_vs_dest *ip_vs_try_bind_dest(struct ip_vs_conn *cp); 1392 1393 1394 /* 1395 * IPVS sync daemon data and function prototypes 1396 * (from ip_vs_sync.c) 1397 */ 1398 extern int start_sync_thread(struct net *net, int state, char *mcast_ifn, 1399 __u8 syncid); 1400 extern int stop_sync_thread(struct net *net, int state); 1401 extern void ip_vs_sync_conn(struct net *net, struct ip_vs_conn *cp, int pkts); 1402 1403 1404 /* 1405 * IPVS rate estimator prototypes (from ip_vs_est.c) 1406 */ 1407 extern void ip_vs_start_estimator(struct net *net, struct ip_vs_stats *stats); 1408 extern void ip_vs_stop_estimator(struct net *net, struct ip_vs_stats *stats); 1409 extern void ip_vs_zero_estimator(struct ip_vs_stats *stats); 1410 extern void ip_vs_read_estimator(struct ip_vs_stats_user *dst, 1411 struct ip_vs_stats *stats); 1412 1413 /* 1414 * Various IPVS packet transmitters (from ip_vs_xmit.c) 1415 */ 1416 extern int ip_vs_null_xmit(struct sk_buff *skb, struct ip_vs_conn *cp, 1417 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph); 1418 extern int ip_vs_bypass_xmit(struct sk_buff *skb, struct ip_vs_conn *cp, 1419 struct ip_vs_protocol *pp, 1420 struct ip_vs_iphdr *iph); 1421 extern int ip_vs_nat_xmit(struct sk_buff *skb, struct ip_vs_conn *cp, 1422 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph); 1423 extern int ip_vs_tunnel_xmit(struct sk_buff *skb, struct ip_vs_conn *cp, 1424 struct ip_vs_protocol *pp, 1425 struct ip_vs_iphdr *iph); 1426 extern int ip_vs_dr_xmit(struct sk_buff *skb, struct ip_vs_conn *cp, 1427 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph); 1428 extern int ip_vs_icmp_xmit(struct sk_buff *skb, struct ip_vs_conn *cp, 1429 struct ip_vs_protocol *pp, int offset, 1430 unsigned int hooknum, struct ip_vs_iphdr *iph); 1431 extern void ip_vs_dst_reset(struct ip_vs_dest *dest); 1432 1433 #ifdef CONFIG_IP_VS_IPV6 1434 extern int ip_vs_bypass_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp, 1435 struct ip_vs_protocol *pp, 1436 struct ip_vs_iphdr *iph); 1437 extern int ip_vs_nat_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp, 1438 struct ip_vs_protocol *pp, 1439 struct ip_vs_iphdr *iph); 1440 extern int ip_vs_tunnel_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp, 1441 struct ip_vs_protocol *pp, 1442 struct ip_vs_iphdr *iph); 1443 extern int ip_vs_dr_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp, 1444 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph); 1445 extern int ip_vs_icmp_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp, 1446 struct ip_vs_protocol *pp, int offset, 1447 unsigned int hooknum, struct ip_vs_iphdr *iph); 1448 #endif 1449 1450 #ifdef CONFIG_SYSCTL 1451 /* 1452 * This is a simple mechanism to ignore packets when 1453 * we are loaded. Just set ip_vs_drop_rate to 'n' and 1454 * we start to drop 1/rate of the packets 1455 */ 1456 1457 static inline int ip_vs_todrop(struct netns_ipvs *ipvs) 1458 { 1459 if (!ipvs->drop_rate) 1460 return 0; 1461 if (--ipvs->drop_counter > 0) 1462 return 0; 1463 ipvs->drop_counter = ipvs->drop_rate; 1464 return 1; 1465 } 1466 #else 1467 static inline int ip_vs_todrop(struct netns_ipvs *ipvs) { return 0; } 1468 #endif 1469 1470 /* 1471 * ip_vs_fwd_tag returns the forwarding tag of the connection 1472 */ 1473 #define IP_VS_FWD_METHOD(cp) (cp->flags & IP_VS_CONN_F_FWD_MASK) 1474 1475 static inline char ip_vs_fwd_tag(struct ip_vs_conn *cp) 1476 { 1477 char fwd; 1478 1479 switch (IP_VS_FWD_METHOD(cp)) { 1480 case IP_VS_CONN_F_MASQ: 1481 fwd = 'M'; break; 1482 case IP_VS_CONN_F_LOCALNODE: 1483 fwd = 'L'; break; 1484 case IP_VS_CONN_F_TUNNEL: 1485 fwd = 'T'; break; 1486 case IP_VS_CONN_F_DROUTE: 1487 fwd = 'R'; break; 1488 case IP_VS_CONN_F_BYPASS: 1489 fwd = 'B'; break; 1490 default: 1491 fwd = '?'; break; 1492 } 1493 return fwd; 1494 } 1495 1496 extern void ip_vs_nat_icmp(struct sk_buff *skb, struct ip_vs_protocol *pp, 1497 struct ip_vs_conn *cp, int dir); 1498 1499 #ifdef CONFIG_IP_VS_IPV6 1500 extern void ip_vs_nat_icmp_v6(struct sk_buff *skb, struct ip_vs_protocol *pp, 1501 struct ip_vs_conn *cp, int dir); 1502 #endif 1503 1504 extern __sum16 ip_vs_checksum_complete(struct sk_buff *skb, int offset); 1505 1506 static inline __wsum ip_vs_check_diff4(__be32 old, __be32 new, __wsum oldsum) 1507 { 1508 __be32 diff[2] = { ~old, new }; 1509 1510 return csum_partial(diff, sizeof(diff), oldsum); 1511 } 1512 1513 #ifdef CONFIG_IP_VS_IPV6 1514 static inline __wsum ip_vs_check_diff16(const __be32 *old, const __be32 *new, 1515 __wsum oldsum) 1516 { 1517 __be32 diff[8] = { ~old[3], ~old[2], ~old[1], ~old[0], 1518 new[3], new[2], new[1], new[0] }; 1519 1520 return csum_partial(diff, sizeof(diff), oldsum); 1521 } 1522 #endif 1523 1524 static inline __wsum ip_vs_check_diff2(__be16 old, __be16 new, __wsum oldsum) 1525 { 1526 __be16 diff[2] = { ~old, new }; 1527 1528 return csum_partial(diff, sizeof(diff), oldsum); 1529 } 1530 1531 /* 1532 * Forget current conntrack (unconfirmed) and attach notrack entry 1533 */ 1534 static inline void ip_vs_notrack(struct sk_buff *skb) 1535 { 1536 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) 1537 enum ip_conntrack_info ctinfo; 1538 struct nf_conn *ct = nf_ct_get(skb, &ctinfo); 1539 1540 if (!ct || !nf_ct_is_untracked(ct)) { 1541 nf_conntrack_put(skb->nfct); 1542 skb->nfct = &nf_ct_untracked_get()->ct_general; 1543 skb->nfctinfo = IP_CT_NEW; 1544 nf_conntrack_get(skb->nfct); 1545 } 1546 #endif 1547 } 1548 1549 #ifdef CONFIG_IP_VS_NFCT 1550 /* 1551 * Netfilter connection tracking 1552 * (from ip_vs_nfct.c) 1553 */ 1554 static inline int ip_vs_conntrack_enabled(struct netns_ipvs *ipvs) 1555 { 1556 #ifdef CONFIG_SYSCTL 1557 return ipvs->sysctl_conntrack; 1558 #else 1559 return 0; 1560 #endif 1561 } 1562 1563 extern void ip_vs_update_conntrack(struct sk_buff *skb, struct ip_vs_conn *cp, 1564 int outin); 1565 extern int ip_vs_confirm_conntrack(struct sk_buff *skb); 1566 extern void ip_vs_nfct_expect_related(struct sk_buff *skb, struct nf_conn *ct, 1567 struct ip_vs_conn *cp, u_int8_t proto, 1568 const __be16 port, int from_rs); 1569 extern void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp); 1570 1571 #else 1572 1573 static inline int ip_vs_conntrack_enabled(struct netns_ipvs *ipvs) 1574 { 1575 return 0; 1576 } 1577 1578 static inline void ip_vs_update_conntrack(struct sk_buff *skb, 1579 struct ip_vs_conn *cp, int outin) 1580 { 1581 } 1582 1583 static inline int ip_vs_confirm_conntrack(struct sk_buff *skb) 1584 { 1585 return NF_ACCEPT; 1586 } 1587 1588 static inline void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp) 1589 { 1590 } 1591 /* CONFIG_IP_VS_NFCT */ 1592 #endif 1593 1594 static inline unsigned int 1595 ip_vs_dest_conn_overhead(struct ip_vs_dest *dest) 1596 { 1597 /* 1598 * We think the overhead of processing active connections is 256 1599 * times higher than that of inactive connections in average. (This 1600 * 256 times might not be accurate, we will change it later) We 1601 * use the following formula to estimate the overhead now: 1602 * dest->activeconns*256 + dest->inactconns 1603 */ 1604 return (atomic_read(&dest->activeconns) << 8) + 1605 atomic_read(&dest->inactconns); 1606 } 1607 1608 #endif /* _NET_IP_VS_H */ 1609