1 /* SPDX-License-Identifier: GPL-2.0 */ 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/refcount.h> /* for struct refcount_t */ 17 18 #include <linux/compiler.h> 19 #include <linux/timer.h> 20 #include <linux/bug.h> 21 22 #include <net/checksum.h> 23 #include <linux/netfilter.h> /* for union nf_inet_addr */ 24 #include <linux/ip.h> 25 #include <linux/ipv6.h> /* for struct ipv6hdr */ 26 #include <net/ipv6.h> 27 #if IS_ENABLED(CONFIG_IP_VS_IPV6) 28 #include <linux/netfilter_ipv6/ip6_tables.h> 29 #endif 30 #if IS_ENABLED(CONFIG_NF_CONNTRACK) 31 #include <net/netfilter/nf_conntrack.h> 32 #endif 33 #include <net/net_namespace.h> /* Netw namespace */ 34 35 #define IP_VS_HDR_INVERSE 1 36 #define IP_VS_HDR_ICMP 2 37 38 /* Generic access of ipvs struct */ 39 static inline struct netns_ipvs *net_ipvs(struct net* net) 40 { 41 return net->ipvs; 42 } 43 44 /* Connections' size value needed by ip_vs_ctl.c */ 45 extern int ip_vs_conn_tab_size; 46 47 struct ip_vs_iphdr { 48 int hdr_flags; /* ipvs flags */ 49 __u32 off; /* Where IP or IPv4 header starts */ 50 __u32 len; /* IPv4 simply where L4 starts 51 * IPv6 where L4 Transport Header starts */ 52 __u16 fragoffs; /* IPv6 fragment offset, 0 if first frag (or not frag)*/ 53 __s16 protocol; 54 __s32 flags; 55 union nf_inet_addr saddr; 56 union nf_inet_addr daddr; 57 }; 58 59 static inline void *frag_safe_skb_hp(const struct sk_buff *skb, int offset, 60 int len, void *buffer) 61 { 62 return skb_header_pointer(skb, offset, len, buffer); 63 } 64 65 /* This function handles filling *ip_vs_iphdr, both for IPv4 and IPv6. 66 * IPv6 requires some extra work, as finding proper header position, 67 * depend on the IPv6 extension headers. 68 */ 69 static inline int 70 ip_vs_fill_iph_skb_off(int af, const struct sk_buff *skb, int offset, 71 int hdr_flags, struct ip_vs_iphdr *iphdr) 72 { 73 iphdr->hdr_flags = hdr_flags; 74 iphdr->off = offset; 75 76 #ifdef CONFIG_IP_VS_IPV6 77 if (af == AF_INET6) { 78 struct ipv6hdr _iph; 79 const struct ipv6hdr *iph = skb_header_pointer( 80 skb, offset, sizeof(_iph), &_iph); 81 if (!iph) 82 return 0; 83 84 iphdr->saddr.in6 = iph->saddr; 85 iphdr->daddr.in6 = iph->daddr; 86 /* ipv6_find_hdr() updates len, flags */ 87 iphdr->len = offset; 88 iphdr->flags = 0; 89 iphdr->protocol = ipv6_find_hdr(skb, &iphdr->len, -1, 90 &iphdr->fragoffs, 91 &iphdr->flags); 92 if (iphdr->protocol < 0) 93 return 0; 94 } else 95 #endif 96 { 97 struct iphdr _iph; 98 const struct iphdr *iph = skb_header_pointer( 99 skb, offset, sizeof(_iph), &_iph); 100 if (!iph) 101 return 0; 102 103 iphdr->len = offset + iph->ihl * 4; 104 iphdr->fragoffs = 0; 105 iphdr->protocol = iph->protocol; 106 iphdr->saddr.ip = iph->saddr; 107 iphdr->daddr.ip = iph->daddr; 108 } 109 110 return 1; 111 } 112 113 static inline int 114 ip_vs_fill_iph_skb_icmp(int af, const struct sk_buff *skb, int offset, 115 bool inverse, struct ip_vs_iphdr *iphdr) 116 { 117 int hdr_flags = IP_VS_HDR_ICMP; 118 119 if (inverse) 120 hdr_flags |= IP_VS_HDR_INVERSE; 121 122 return ip_vs_fill_iph_skb_off(af, skb, offset, hdr_flags, iphdr); 123 } 124 125 static inline int 126 ip_vs_fill_iph_skb(int af, const struct sk_buff *skb, bool inverse, 127 struct ip_vs_iphdr *iphdr) 128 { 129 int hdr_flags = 0; 130 131 if (inverse) 132 hdr_flags |= IP_VS_HDR_INVERSE; 133 134 return ip_vs_fill_iph_skb_off(af, skb, skb_network_offset(skb), 135 hdr_flags, iphdr); 136 } 137 138 static inline bool 139 ip_vs_iph_inverse(const struct ip_vs_iphdr *iph) 140 { 141 return !!(iph->hdr_flags & IP_VS_HDR_INVERSE); 142 } 143 144 static inline bool 145 ip_vs_iph_icmp(const struct ip_vs_iphdr *iph) 146 { 147 return !!(iph->hdr_flags & IP_VS_HDR_ICMP); 148 } 149 150 static inline void ip_vs_addr_copy(int af, union nf_inet_addr *dst, 151 const union nf_inet_addr *src) 152 { 153 #ifdef CONFIG_IP_VS_IPV6 154 if (af == AF_INET6) 155 dst->in6 = src->in6; 156 else 157 #endif 158 dst->ip = src->ip; 159 } 160 161 static inline void ip_vs_addr_set(int af, union nf_inet_addr *dst, 162 const union nf_inet_addr *src) 163 { 164 #ifdef CONFIG_IP_VS_IPV6 165 if (af == AF_INET6) { 166 dst->in6 = src->in6; 167 return; 168 } 169 #endif 170 dst->ip = src->ip; 171 dst->all[1] = 0; 172 dst->all[2] = 0; 173 dst->all[3] = 0; 174 } 175 176 static inline int ip_vs_addr_equal(int af, const union nf_inet_addr *a, 177 const union nf_inet_addr *b) 178 { 179 #ifdef CONFIG_IP_VS_IPV6 180 if (af == AF_INET6) 181 return ipv6_addr_equal(&a->in6, &b->in6); 182 #endif 183 return a->ip == b->ip; 184 } 185 186 #ifdef CONFIG_IP_VS_DEBUG 187 #include <linux/net.h> 188 189 int ip_vs_get_debug_level(void); 190 191 static inline const char *ip_vs_dbg_addr(int af, char *buf, size_t buf_len, 192 const union nf_inet_addr *addr, 193 int *idx) 194 { 195 int len; 196 #ifdef CONFIG_IP_VS_IPV6 197 if (af == AF_INET6) 198 len = snprintf(&buf[*idx], buf_len - *idx, "[%pI6c]", 199 &addr->in6) + 1; 200 else 201 #endif 202 len = snprintf(&buf[*idx], buf_len - *idx, "%pI4", 203 &addr->ip) + 1; 204 205 *idx += len; 206 BUG_ON(*idx > buf_len + 1); 207 return &buf[*idx - len]; 208 } 209 210 #define IP_VS_DBG_BUF(level, msg, ...) \ 211 do { \ 212 char ip_vs_dbg_buf[160]; \ 213 int ip_vs_dbg_idx = 0; \ 214 if (level <= ip_vs_get_debug_level()) \ 215 printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \ 216 } while (0) 217 #define IP_VS_ERR_BUF(msg...) \ 218 do { \ 219 char ip_vs_dbg_buf[160]; \ 220 int ip_vs_dbg_idx = 0; \ 221 pr_err(msg); \ 222 } while (0) 223 224 /* Only use from within IP_VS_DBG_BUF() or IP_VS_ERR_BUF macros */ 225 #define IP_VS_DBG_ADDR(af, addr) \ 226 ip_vs_dbg_addr(af, ip_vs_dbg_buf, \ 227 sizeof(ip_vs_dbg_buf), addr, \ 228 &ip_vs_dbg_idx) 229 230 #define IP_VS_DBG(level, msg, ...) \ 231 do { \ 232 if (level <= ip_vs_get_debug_level()) \ 233 printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \ 234 } while (0) 235 #define IP_VS_DBG_RL(msg, ...) \ 236 do { \ 237 if (net_ratelimit()) \ 238 printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \ 239 } while (0) 240 #define IP_VS_DBG_PKT(level, af, pp, skb, ofs, msg) \ 241 do { \ 242 if (level <= ip_vs_get_debug_level()) \ 243 pp->debug_packet(af, pp, skb, ofs, msg); \ 244 } while (0) 245 #define IP_VS_DBG_RL_PKT(level, af, pp, skb, ofs, msg) \ 246 do { \ 247 if (level <= ip_vs_get_debug_level() && \ 248 net_ratelimit()) \ 249 pp->debug_packet(af, pp, skb, ofs, msg); \ 250 } while (0) 251 #else /* NO DEBUGGING at ALL */ 252 #define IP_VS_DBG_BUF(level, msg...) do {} while (0) 253 #define IP_VS_ERR_BUF(msg...) do {} while (0) 254 #define IP_VS_DBG(level, msg...) do {} while (0) 255 #define IP_VS_DBG_RL(msg...) do {} while (0) 256 #define IP_VS_DBG_PKT(level, af, pp, skb, ofs, msg) do {} while (0) 257 #define IP_VS_DBG_RL_PKT(level, af, pp, skb, ofs, msg) do {} while (0) 258 #endif 259 260 #define IP_VS_BUG() BUG() 261 #define IP_VS_ERR_RL(msg, ...) \ 262 do { \ 263 if (net_ratelimit()) \ 264 pr_err(msg, ##__VA_ARGS__); \ 265 } while (0) 266 267 #ifdef CONFIG_IP_VS_DEBUG 268 #define EnterFunction(level) \ 269 do { \ 270 if (level <= ip_vs_get_debug_level()) \ 271 printk(KERN_DEBUG \ 272 pr_fmt("Enter: %s, %s line %i\n"), \ 273 __func__, __FILE__, __LINE__); \ 274 } while (0) 275 #define LeaveFunction(level) \ 276 do { \ 277 if (level <= ip_vs_get_debug_level()) \ 278 printk(KERN_DEBUG \ 279 pr_fmt("Leave: %s, %s line %i\n"), \ 280 __func__, __FILE__, __LINE__); \ 281 } while (0) 282 #else 283 #define EnterFunction(level) do {} while (0) 284 #define LeaveFunction(level) do {} while (0) 285 #endif 286 287 /* The port number of FTP service (in network order). */ 288 #define FTPPORT cpu_to_be16(21) 289 #define FTPDATA cpu_to_be16(20) 290 291 /* TCP State Values */ 292 enum { 293 IP_VS_TCP_S_NONE = 0, 294 IP_VS_TCP_S_ESTABLISHED, 295 IP_VS_TCP_S_SYN_SENT, 296 IP_VS_TCP_S_SYN_RECV, 297 IP_VS_TCP_S_FIN_WAIT, 298 IP_VS_TCP_S_TIME_WAIT, 299 IP_VS_TCP_S_CLOSE, 300 IP_VS_TCP_S_CLOSE_WAIT, 301 IP_VS_TCP_S_LAST_ACK, 302 IP_VS_TCP_S_LISTEN, 303 IP_VS_TCP_S_SYNACK, 304 IP_VS_TCP_S_LAST 305 }; 306 307 /* UDP State Values */ 308 enum { 309 IP_VS_UDP_S_NORMAL, 310 IP_VS_UDP_S_LAST, 311 }; 312 313 /* ICMP State Values */ 314 enum { 315 IP_VS_ICMP_S_NORMAL, 316 IP_VS_ICMP_S_LAST, 317 }; 318 319 /* SCTP State Values */ 320 enum ip_vs_sctp_states { 321 IP_VS_SCTP_S_NONE, 322 IP_VS_SCTP_S_INIT1, 323 IP_VS_SCTP_S_INIT, 324 IP_VS_SCTP_S_COOKIE_SENT, 325 IP_VS_SCTP_S_COOKIE_REPLIED, 326 IP_VS_SCTP_S_COOKIE_WAIT, 327 IP_VS_SCTP_S_COOKIE, 328 IP_VS_SCTP_S_COOKIE_ECHOED, 329 IP_VS_SCTP_S_ESTABLISHED, 330 IP_VS_SCTP_S_SHUTDOWN_SENT, 331 IP_VS_SCTP_S_SHUTDOWN_RECEIVED, 332 IP_VS_SCTP_S_SHUTDOWN_ACK_SENT, 333 IP_VS_SCTP_S_REJECTED, 334 IP_VS_SCTP_S_CLOSED, 335 IP_VS_SCTP_S_LAST 336 }; 337 338 /* Connection templates use bits from state */ 339 #define IP_VS_CTPL_S_NONE 0x0000 340 #define IP_VS_CTPL_S_ASSURED 0x0001 341 #define IP_VS_CTPL_S_LAST 0x0002 342 343 /* Delta sequence info structure 344 * Each ip_vs_conn has 2 (output AND input seq. changes). 345 * Only used in the VS/NAT. 346 */ 347 struct ip_vs_seq { 348 __u32 init_seq; /* Add delta from this seq */ 349 __u32 delta; /* Delta in sequence numbers */ 350 __u32 previous_delta; /* Delta in sequence numbers 351 * before last resized pkt */ 352 }; 353 354 /* counters per cpu */ 355 struct ip_vs_counters { 356 __u64 conns; /* connections scheduled */ 357 __u64 inpkts; /* incoming packets */ 358 __u64 outpkts; /* outgoing packets */ 359 __u64 inbytes; /* incoming bytes */ 360 __u64 outbytes; /* outgoing bytes */ 361 }; 362 /* Stats per cpu */ 363 struct ip_vs_cpu_stats { 364 struct ip_vs_counters cnt; 365 struct u64_stats_sync syncp; 366 }; 367 368 /* IPVS statistics objects */ 369 struct ip_vs_estimator { 370 struct list_head list; 371 372 u64 last_inbytes; 373 u64 last_outbytes; 374 u64 last_conns; 375 u64 last_inpkts; 376 u64 last_outpkts; 377 378 u64 cps; 379 u64 inpps; 380 u64 outpps; 381 u64 inbps; 382 u64 outbps; 383 }; 384 385 /* 386 * IPVS statistics object, 64-bit kernel version of struct ip_vs_stats_user 387 */ 388 struct ip_vs_kstats { 389 u64 conns; /* connections scheduled */ 390 u64 inpkts; /* incoming packets */ 391 u64 outpkts; /* outgoing packets */ 392 u64 inbytes; /* incoming bytes */ 393 u64 outbytes; /* outgoing bytes */ 394 395 u64 cps; /* current connection rate */ 396 u64 inpps; /* current in packet rate */ 397 u64 outpps; /* current out packet rate */ 398 u64 inbps; /* current in byte rate */ 399 u64 outbps; /* current out byte rate */ 400 }; 401 402 struct ip_vs_stats { 403 struct ip_vs_kstats kstats; /* kernel statistics */ 404 struct ip_vs_estimator est; /* estimator */ 405 struct ip_vs_cpu_stats __percpu *cpustats; /* per cpu counters */ 406 spinlock_t lock; /* spin lock */ 407 struct ip_vs_kstats kstats0; /* reset values */ 408 }; 409 410 struct dst_entry; 411 struct iphdr; 412 struct ip_vs_conn; 413 struct ip_vs_app; 414 struct sk_buff; 415 struct ip_vs_proto_data; 416 417 struct ip_vs_protocol { 418 struct ip_vs_protocol *next; 419 char *name; 420 u16 protocol; 421 u16 num_states; 422 int dont_defrag; 423 424 void (*init)(struct ip_vs_protocol *pp); 425 426 void (*exit)(struct ip_vs_protocol *pp); 427 428 int (*init_netns)(struct netns_ipvs *ipvs, struct ip_vs_proto_data *pd); 429 430 void (*exit_netns)(struct netns_ipvs *ipvs, struct ip_vs_proto_data *pd); 431 432 int (*conn_schedule)(struct netns_ipvs *ipvs, 433 int af, struct sk_buff *skb, 434 struct ip_vs_proto_data *pd, 435 int *verdict, struct ip_vs_conn **cpp, 436 struct ip_vs_iphdr *iph); 437 438 struct ip_vs_conn * 439 (*conn_in_get)(struct netns_ipvs *ipvs, 440 int af, 441 const struct sk_buff *skb, 442 const struct ip_vs_iphdr *iph); 443 444 struct ip_vs_conn * 445 (*conn_out_get)(struct netns_ipvs *ipvs, 446 int af, 447 const struct sk_buff *skb, 448 const struct ip_vs_iphdr *iph); 449 450 int (*snat_handler)(struct sk_buff *skb, struct ip_vs_protocol *pp, 451 struct ip_vs_conn *cp, struct ip_vs_iphdr *iph); 452 453 int (*dnat_handler)(struct sk_buff *skb, struct ip_vs_protocol *pp, 454 struct ip_vs_conn *cp, struct ip_vs_iphdr *iph); 455 456 const char *(*state_name)(int state); 457 458 void (*state_transition)(struct ip_vs_conn *cp, int direction, 459 const struct sk_buff *skb, 460 struct ip_vs_proto_data *pd); 461 462 int (*register_app)(struct netns_ipvs *ipvs, struct ip_vs_app *inc); 463 464 void (*unregister_app)(struct netns_ipvs *ipvs, struct ip_vs_app *inc); 465 466 int (*app_conn_bind)(struct ip_vs_conn *cp); 467 468 void (*debug_packet)(int af, struct ip_vs_protocol *pp, 469 const struct sk_buff *skb, 470 int offset, 471 const char *msg); 472 473 void (*timeout_change)(struct ip_vs_proto_data *pd, int flags); 474 }; 475 476 /* protocol data per netns */ 477 struct ip_vs_proto_data { 478 struct ip_vs_proto_data *next; 479 struct ip_vs_protocol *pp; 480 int *timeout_table; /* protocol timeout table */ 481 atomic_t appcnt; /* counter of proto app incs. */ 482 struct tcp_states_t *tcp_state_table; 483 }; 484 485 struct ip_vs_protocol *ip_vs_proto_get(unsigned short proto); 486 struct ip_vs_proto_data *ip_vs_proto_data_get(struct netns_ipvs *ipvs, 487 unsigned short proto); 488 489 struct ip_vs_conn_param { 490 struct netns_ipvs *ipvs; 491 const union nf_inet_addr *caddr; 492 const union nf_inet_addr *vaddr; 493 __be16 cport; 494 __be16 vport; 495 __u16 protocol; 496 u16 af; 497 498 const struct ip_vs_pe *pe; 499 char *pe_data; 500 __u8 pe_data_len; 501 }; 502 503 /* IP_VS structure allocated for each dynamically scheduled connection */ 504 struct ip_vs_conn { 505 struct hlist_node c_list; /* hashed list heads */ 506 /* Protocol, addresses and port numbers */ 507 __be16 cport; 508 __be16 dport; 509 __be16 vport; 510 u16 af; /* address family */ 511 union nf_inet_addr caddr; /* client address */ 512 union nf_inet_addr vaddr; /* virtual address */ 513 union nf_inet_addr daddr; /* destination address */ 514 volatile __u32 flags; /* status flags */ 515 __u16 protocol; /* Which protocol (TCP/UDP) */ 516 __u16 daf; /* Address family of the dest */ 517 struct netns_ipvs *ipvs; 518 519 /* counter and timer */ 520 refcount_t refcnt; /* reference count */ 521 struct timer_list timer; /* Expiration timer */ 522 volatile unsigned long timeout; /* timeout */ 523 524 /* Flags and state transition */ 525 spinlock_t lock; /* lock for state transition */ 526 volatile __u16 state; /* state info */ 527 volatile __u16 old_state; /* old state, to be used for 528 * state transition triggerd 529 * synchronization 530 */ 531 __u32 fwmark; /* Fire wall mark from skb */ 532 unsigned long sync_endtime; /* jiffies + sent_retries */ 533 534 /* Control members */ 535 struct ip_vs_conn *control; /* Master control connection */ 536 atomic_t n_control; /* Number of controlled ones */ 537 struct ip_vs_dest *dest; /* real server */ 538 atomic_t in_pkts; /* incoming packet counter */ 539 540 /* Packet transmitter for different forwarding methods. If it 541 * mangles the packet, it must return NF_DROP or better NF_STOLEN, 542 * otherwise this must be changed to a sk_buff **. 543 * NF_ACCEPT can be returned when destination is local. 544 */ 545 int (*packet_xmit)(struct sk_buff *skb, struct ip_vs_conn *cp, 546 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph); 547 548 /* Note: we can group the following members into a structure, 549 * in order to save more space, and the following members are 550 * only used in VS/NAT anyway 551 */ 552 struct ip_vs_app *app; /* bound ip_vs_app object */ 553 void *app_data; /* Application private data */ 554 struct ip_vs_seq in_seq; /* incoming seq. struct */ 555 struct ip_vs_seq out_seq; /* outgoing seq. struct */ 556 557 const struct ip_vs_pe *pe; 558 char *pe_data; 559 __u8 pe_data_len; 560 561 struct rcu_head rcu_head; 562 }; 563 564 /* Extended internal versions of struct ip_vs_service_user and ip_vs_dest_user 565 * for IPv6 support. 566 * 567 * We need these to conveniently pass around service and destination 568 * options, but unfortunately, we also need to keep the old definitions to 569 * maintain userspace backwards compatibility for the setsockopt interface. 570 */ 571 struct ip_vs_service_user_kern { 572 /* virtual service addresses */ 573 u16 af; 574 u16 protocol; 575 union nf_inet_addr addr; /* virtual ip address */ 576 __be16 port; 577 u32 fwmark; /* firwall mark of service */ 578 579 /* virtual service options */ 580 char *sched_name; 581 char *pe_name; 582 unsigned int flags; /* virtual service flags */ 583 unsigned int timeout; /* persistent timeout in sec */ 584 __be32 netmask; /* persistent netmask or plen */ 585 }; 586 587 588 struct ip_vs_dest_user_kern { 589 /* destination server address */ 590 union nf_inet_addr addr; 591 __be16 port; 592 593 /* real server options */ 594 unsigned int conn_flags; /* connection flags */ 595 int weight; /* destination weight */ 596 597 /* thresholds for active connections */ 598 u32 u_threshold; /* upper threshold */ 599 u32 l_threshold; /* lower threshold */ 600 601 /* Address family of addr */ 602 u16 af; 603 604 u16 tun_type; /* tunnel type */ 605 __be16 tun_port; /* tunnel port */ 606 }; 607 608 609 /* 610 * The information about the virtual service offered to the net and the 611 * forwarding entries. 612 */ 613 struct ip_vs_service { 614 struct hlist_node s_list; /* for normal service table */ 615 struct hlist_node f_list; /* for fwmark-based service table */ 616 atomic_t refcnt; /* reference counter */ 617 618 u16 af; /* address family */ 619 __u16 protocol; /* which protocol (TCP/UDP) */ 620 union nf_inet_addr addr; /* IP address for virtual service */ 621 __be16 port; /* port number for the service */ 622 __u32 fwmark; /* firewall mark of the service */ 623 unsigned int flags; /* service status flags */ 624 unsigned int timeout; /* persistent timeout in ticks */ 625 __be32 netmask; /* grouping granularity, mask/plen */ 626 struct netns_ipvs *ipvs; 627 628 struct list_head destinations; /* real server d-linked list */ 629 __u32 num_dests; /* number of servers */ 630 struct ip_vs_stats stats; /* statistics for the service */ 631 632 /* for scheduling */ 633 struct ip_vs_scheduler __rcu *scheduler; /* bound scheduler object */ 634 spinlock_t sched_lock; /* lock sched_data */ 635 void *sched_data; /* scheduler application data */ 636 637 /* alternate persistence engine */ 638 struct ip_vs_pe __rcu *pe; 639 int conntrack_afmask; 640 641 struct rcu_head rcu_head; 642 }; 643 644 /* Information for cached dst */ 645 struct ip_vs_dest_dst { 646 struct dst_entry *dst_cache; /* destination cache entry */ 647 u32 dst_cookie; 648 union nf_inet_addr dst_saddr; 649 struct rcu_head rcu_head; 650 }; 651 652 /* The real server destination forwarding entry with ip address, port number, 653 * and so on. 654 */ 655 struct ip_vs_dest { 656 struct list_head n_list; /* for the dests in the service */ 657 struct hlist_node d_list; /* for table with all the dests */ 658 659 u16 af; /* address family */ 660 __be16 port; /* port number of the server */ 661 union nf_inet_addr addr; /* IP address of the server */ 662 volatile unsigned int flags; /* dest status flags */ 663 atomic_t conn_flags; /* flags to copy to conn */ 664 atomic_t weight; /* server weight */ 665 atomic_t last_weight; /* server latest weight */ 666 __u16 tun_type; /* tunnel type */ 667 __be16 tun_port; /* tunnel port */ 668 669 refcount_t refcnt; /* reference counter */ 670 struct ip_vs_stats stats; /* statistics */ 671 unsigned long idle_start; /* start time, jiffies */ 672 673 /* connection counters and thresholds */ 674 atomic_t activeconns; /* active connections */ 675 atomic_t inactconns; /* inactive connections */ 676 atomic_t persistconns; /* persistent connections */ 677 __u32 u_threshold; /* upper threshold */ 678 __u32 l_threshold; /* lower threshold */ 679 680 /* for destination cache */ 681 spinlock_t dst_lock; /* lock of dst_cache */ 682 struct ip_vs_dest_dst __rcu *dest_dst; /* cached dst info */ 683 684 /* for virtual service */ 685 struct ip_vs_service __rcu *svc; /* service it belongs to */ 686 __u16 protocol; /* which protocol (TCP/UDP) */ 687 __be16 vport; /* virtual port number */ 688 union nf_inet_addr vaddr; /* virtual IP address */ 689 __u32 vfwmark; /* firewall mark of service */ 690 691 struct list_head t_list; /* in dest_trash */ 692 unsigned int in_rs_table:1; /* we are in rs_table */ 693 }; 694 695 /* The scheduler object */ 696 struct ip_vs_scheduler { 697 struct list_head n_list; /* d-linked list head */ 698 char *name; /* scheduler name */ 699 atomic_t refcnt; /* reference counter */ 700 struct module *module; /* THIS_MODULE/NULL */ 701 702 /* scheduler initializing service */ 703 int (*init_service)(struct ip_vs_service *svc); 704 /* scheduling service finish */ 705 void (*done_service)(struct ip_vs_service *svc); 706 /* dest is linked */ 707 int (*add_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest); 708 /* dest is unlinked */ 709 int (*del_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest); 710 /* dest is updated */ 711 int (*upd_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest); 712 713 /* selecting a server from the given service */ 714 struct ip_vs_dest* (*schedule)(struct ip_vs_service *svc, 715 const struct sk_buff *skb, 716 struct ip_vs_iphdr *iph); 717 }; 718 719 /* The persistence engine object */ 720 struct ip_vs_pe { 721 struct list_head n_list; /* d-linked list head */ 722 char *name; /* scheduler name */ 723 atomic_t refcnt; /* reference counter */ 724 struct module *module; /* THIS_MODULE/NULL */ 725 726 /* get the connection template, if any */ 727 int (*fill_param)(struct ip_vs_conn_param *p, struct sk_buff *skb); 728 bool (*ct_match)(const struct ip_vs_conn_param *p, 729 struct ip_vs_conn *ct); 730 u32 (*hashkey_raw)(const struct ip_vs_conn_param *p, u32 initval, 731 bool inverse); 732 int (*show_pe_data)(const struct ip_vs_conn *cp, char *buf); 733 /* create connections for real-server outgoing packets */ 734 struct ip_vs_conn* (*conn_out)(struct ip_vs_service *svc, 735 struct ip_vs_dest *dest, 736 struct sk_buff *skb, 737 const struct ip_vs_iphdr *iph, 738 __be16 dport, __be16 cport); 739 }; 740 741 /* The application module object (a.k.a. app incarnation) */ 742 struct ip_vs_app { 743 struct list_head a_list; /* member in app list */ 744 int type; /* IP_VS_APP_TYPE_xxx */ 745 char *name; /* application module name */ 746 __u16 protocol; 747 struct module *module; /* THIS_MODULE/NULL */ 748 struct list_head incs_list; /* list of incarnations */ 749 750 /* members for application incarnations */ 751 struct list_head p_list; /* member in proto app list */ 752 struct ip_vs_app *app; /* its real application */ 753 __be16 port; /* port number in net order */ 754 atomic_t usecnt; /* usage counter */ 755 struct rcu_head rcu_head; 756 757 /* output hook: Process packet in inout direction, diff set for TCP. 758 * Return: 0=Error, 1=Payload Not Mangled/Mangled but checksum is ok, 759 * 2=Mangled but checksum was not updated 760 */ 761 int (*pkt_out)(struct ip_vs_app *, struct ip_vs_conn *, 762 struct sk_buff *, int *diff, struct ip_vs_iphdr *ipvsh); 763 764 /* input hook: Process packet in outin direction, diff set for TCP. 765 * Return: 0=Error, 1=Payload Not Mangled/Mangled but checksum is ok, 766 * 2=Mangled but checksum was not updated 767 */ 768 int (*pkt_in)(struct ip_vs_app *, struct ip_vs_conn *, 769 struct sk_buff *, int *diff, struct ip_vs_iphdr *ipvsh); 770 771 /* ip_vs_app initializer */ 772 int (*init_conn)(struct ip_vs_app *, struct ip_vs_conn *); 773 774 /* ip_vs_app finish */ 775 int (*done_conn)(struct ip_vs_app *, struct ip_vs_conn *); 776 777 778 /* not used now */ 779 int (*bind_conn)(struct ip_vs_app *, struct ip_vs_conn *, 780 struct ip_vs_protocol *); 781 782 void (*unbind_conn)(struct ip_vs_app *, struct ip_vs_conn *); 783 784 int * timeout_table; 785 int * timeouts; 786 int timeouts_size; 787 788 int (*conn_schedule)(struct sk_buff *skb, struct ip_vs_app *app, 789 int *verdict, struct ip_vs_conn **cpp); 790 791 struct ip_vs_conn * 792 (*conn_in_get)(const struct sk_buff *skb, struct ip_vs_app *app, 793 const struct iphdr *iph, int inverse); 794 795 struct ip_vs_conn * 796 (*conn_out_get)(const struct sk_buff *skb, struct ip_vs_app *app, 797 const struct iphdr *iph, int inverse); 798 799 int (*state_transition)(struct ip_vs_conn *cp, int direction, 800 const struct sk_buff *skb, 801 struct ip_vs_app *app); 802 803 void (*timeout_change)(struct ip_vs_app *app, int flags); 804 }; 805 806 struct ipvs_master_sync_state { 807 struct list_head sync_queue; 808 struct ip_vs_sync_buff *sync_buff; 809 unsigned long sync_queue_len; 810 unsigned int sync_queue_delay; 811 struct task_struct *master_thread; 812 struct delayed_work master_wakeup_work; 813 struct netns_ipvs *ipvs; 814 }; 815 816 /* How much time to keep dests in trash */ 817 #define IP_VS_DEST_TRASH_PERIOD (120 * HZ) 818 819 struct ipvs_sync_daemon_cfg { 820 union nf_inet_addr mcast_group; 821 int syncid; 822 u16 sync_maxlen; 823 u16 mcast_port; 824 u8 mcast_af; 825 u8 mcast_ttl; 826 /* multicast interface name */ 827 char mcast_ifn[IP_VS_IFNAME_MAXLEN]; 828 }; 829 830 /* IPVS in network namespace */ 831 struct netns_ipvs { 832 int gen; /* Generation */ 833 int enable; /* enable like nf_hooks do */ 834 /* Hash table: for real service lookups */ 835 #define IP_VS_RTAB_BITS 4 836 #define IP_VS_RTAB_SIZE (1 << IP_VS_RTAB_BITS) 837 #define IP_VS_RTAB_MASK (IP_VS_RTAB_SIZE - 1) 838 839 struct hlist_head rs_table[IP_VS_RTAB_SIZE]; 840 /* ip_vs_app */ 841 struct list_head app_list; 842 /* ip_vs_proto */ 843 #define IP_VS_PROTO_TAB_SIZE 32 /* must be power of 2 */ 844 struct ip_vs_proto_data *proto_data_table[IP_VS_PROTO_TAB_SIZE]; 845 /* ip_vs_proto_tcp */ 846 #ifdef CONFIG_IP_VS_PROTO_TCP 847 #define TCP_APP_TAB_BITS 4 848 #define TCP_APP_TAB_SIZE (1 << TCP_APP_TAB_BITS) 849 #define TCP_APP_TAB_MASK (TCP_APP_TAB_SIZE - 1) 850 struct list_head tcp_apps[TCP_APP_TAB_SIZE]; 851 #endif 852 /* ip_vs_proto_udp */ 853 #ifdef CONFIG_IP_VS_PROTO_UDP 854 #define UDP_APP_TAB_BITS 4 855 #define UDP_APP_TAB_SIZE (1 << UDP_APP_TAB_BITS) 856 #define UDP_APP_TAB_MASK (UDP_APP_TAB_SIZE - 1) 857 struct list_head udp_apps[UDP_APP_TAB_SIZE]; 858 #endif 859 /* ip_vs_proto_sctp */ 860 #ifdef CONFIG_IP_VS_PROTO_SCTP 861 #define SCTP_APP_TAB_BITS 4 862 #define SCTP_APP_TAB_SIZE (1 << SCTP_APP_TAB_BITS) 863 #define SCTP_APP_TAB_MASK (SCTP_APP_TAB_SIZE - 1) 864 /* Hash table for SCTP application incarnations */ 865 struct list_head sctp_apps[SCTP_APP_TAB_SIZE]; 866 #endif 867 /* ip_vs_conn */ 868 atomic_t conn_count; /* connection counter */ 869 870 /* ip_vs_ctl */ 871 struct ip_vs_stats tot_stats; /* Statistics & est. */ 872 873 int num_services; /* no of virtual services */ 874 875 /* Trash for destinations */ 876 struct list_head dest_trash; 877 spinlock_t dest_trash_lock; 878 struct timer_list dest_trash_timer; /* expiration timer */ 879 /* Service counters */ 880 atomic_t ftpsvc_counter; 881 atomic_t nullsvc_counter; 882 atomic_t conn_out_counter; 883 884 #ifdef CONFIG_SYSCTL 885 /* 1/rate drop and drop-entry variables */ 886 struct delayed_work defense_work; /* Work handler */ 887 int drop_rate; 888 int drop_counter; 889 atomic_t dropentry; 890 /* locks in ctl.c */ 891 spinlock_t dropentry_lock; /* drop entry handling */ 892 spinlock_t droppacket_lock; /* drop packet handling */ 893 spinlock_t securetcp_lock; /* state and timeout tables */ 894 895 /* sys-ctl struct */ 896 struct ctl_table_header *sysctl_hdr; 897 struct ctl_table *sysctl_tbl; 898 #endif 899 900 /* sysctl variables */ 901 int sysctl_amemthresh; 902 int sysctl_am_droprate; 903 int sysctl_drop_entry; 904 int sysctl_drop_packet; 905 int sysctl_secure_tcp; 906 #ifdef CONFIG_IP_VS_NFCT 907 int sysctl_conntrack; 908 #endif 909 int sysctl_snat_reroute; 910 int sysctl_sync_ver; 911 int sysctl_sync_ports; 912 int sysctl_sync_persist_mode; 913 unsigned long sysctl_sync_qlen_max; 914 int sysctl_sync_sock_size; 915 int sysctl_cache_bypass; 916 int sysctl_expire_nodest_conn; 917 int sysctl_sloppy_tcp; 918 int sysctl_sloppy_sctp; 919 int sysctl_expire_quiescent_template; 920 int sysctl_sync_threshold[2]; 921 unsigned int sysctl_sync_refresh_period; 922 int sysctl_sync_retries; 923 int sysctl_nat_icmp_send; 924 int sysctl_pmtu_disc; 925 int sysctl_backup_only; 926 int sysctl_conn_reuse_mode; 927 int sysctl_schedule_icmp; 928 int sysctl_ignore_tunneled; 929 930 /* ip_vs_lblc */ 931 int sysctl_lblc_expiration; 932 struct ctl_table_header *lblc_ctl_header; 933 struct ctl_table *lblc_ctl_table; 934 /* ip_vs_lblcr */ 935 int sysctl_lblcr_expiration; 936 struct ctl_table_header *lblcr_ctl_header; 937 struct ctl_table *lblcr_ctl_table; 938 /* ip_vs_est */ 939 struct list_head est_list; /* estimator list */ 940 spinlock_t est_lock; 941 struct timer_list est_timer; /* Estimation timer */ 942 /* ip_vs_sync */ 943 spinlock_t sync_lock; 944 struct ipvs_master_sync_state *ms; 945 spinlock_t sync_buff_lock; 946 struct task_struct **backup_threads; 947 int threads_mask; 948 volatile int sync_state; 949 struct mutex sync_mutex; 950 struct ipvs_sync_daemon_cfg mcfg; /* Master Configuration */ 951 struct ipvs_sync_daemon_cfg bcfg; /* Backup Configuration */ 952 /* net name space ptr */ 953 struct net *net; /* Needed by timer routines */ 954 /* Number of heterogeneous destinations, needed becaus heterogeneous 955 * are not supported when synchronization is enabled. 956 */ 957 unsigned int mixed_address_family_dests; 958 }; 959 960 #define DEFAULT_SYNC_THRESHOLD 3 961 #define DEFAULT_SYNC_PERIOD 50 962 #define DEFAULT_SYNC_VER 1 963 #define DEFAULT_SLOPPY_TCP 0 964 #define DEFAULT_SLOPPY_SCTP 0 965 #define DEFAULT_SYNC_REFRESH_PERIOD (0U * HZ) 966 #define DEFAULT_SYNC_RETRIES 0 967 #define IPVS_SYNC_WAKEUP_RATE 8 968 #define IPVS_SYNC_QLEN_MAX (IPVS_SYNC_WAKEUP_RATE * 4) 969 #define IPVS_SYNC_SEND_DELAY (HZ / 50) 970 #define IPVS_SYNC_CHECK_PERIOD HZ 971 #define IPVS_SYNC_FLUSH_TIME (HZ * 2) 972 #define IPVS_SYNC_PORTS_MAX (1 << 6) 973 974 #ifdef CONFIG_SYSCTL 975 976 static inline int sysctl_sync_threshold(struct netns_ipvs *ipvs) 977 { 978 return ipvs->sysctl_sync_threshold[0]; 979 } 980 981 static inline int sysctl_sync_period(struct netns_ipvs *ipvs) 982 { 983 return READ_ONCE(ipvs->sysctl_sync_threshold[1]); 984 } 985 986 static inline unsigned int sysctl_sync_refresh_period(struct netns_ipvs *ipvs) 987 { 988 return READ_ONCE(ipvs->sysctl_sync_refresh_period); 989 } 990 991 static inline int sysctl_sync_retries(struct netns_ipvs *ipvs) 992 { 993 return ipvs->sysctl_sync_retries; 994 } 995 996 static inline int sysctl_sync_ver(struct netns_ipvs *ipvs) 997 { 998 return ipvs->sysctl_sync_ver; 999 } 1000 1001 static inline int sysctl_sloppy_tcp(struct netns_ipvs *ipvs) 1002 { 1003 return ipvs->sysctl_sloppy_tcp; 1004 } 1005 1006 static inline int sysctl_sloppy_sctp(struct netns_ipvs *ipvs) 1007 { 1008 return ipvs->sysctl_sloppy_sctp; 1009 } 1010 1011 static inline int sysctl_sync_ports(struct netns_ipvs *ipvs) 1012 { 1013 return READ_ONCE(ipvs->sysctl_sync_ports); 1014 } 1015 1016 static inline int sysctl_sync_persist_mode(struct netns_ipvs *ipvs) 1017 { 1018 return ipvs->sysctl_sync_persist_mode; 1019 } 1020 1021 static inline unsigned long sysctl_sync_qlen_max(struct netns_ipvs *ipvs) 1022 { 1023 return ipvs->sysctl_sync_qlen_max; 1024 } 1025 1026 static inline int sysctl_sync_sock_size(struct netns_ipvs *ipvs) 1027 { 1028 return ipvs->sysctl_sync_sock_size; 1029 } 1030 1031 static inline int sysctl_pmtu_disc(struct netns_ipvs *ipvs) 1032 { 1033 return ipvs->sysctl_pmtu_disc; 1034 } 1035 1036 static inline int sysctl_backup_only(struct netns_ipvs *ipvs) 1037 { 1038 return ipvs->sync_state & IP_VS_STATE_BACKUP && 1039 ipvs->sysctl_backup_only; 1040 } 1041 1042 static inline int sysctl_conn_reuse_mode(struct netns_ipvs *ipvs) 1043 { 1044 return ipvs->sysctl_conn_reuse_mode; 1045 } 1046 1047 static inline int sysctl_schedule_icmp(struct netns_ipvs *ipvs) 1048 { 1049 return ipvs->sysctl_schedule_icmp; 1050 } 1051 1052 static inline int sysctl_ignore_tunneled(struct netns_ipvs *ipvs) 1053 { 1054 return ipvs->sysctl_ignore_tunneled; 1055 } 1056 1057 static inline int sysctl_cache_bypass(struct netns_ipvs *ipvs) 1058 { 1059 return ipvs->sysctl_cache_bypass; 1060 } 1061 1062 #else 1063 1064 static inline int sysctl_sync_threshold(struct netns_ipvs *ipvs) 1065 { 1066 return DEFAULT_SYNC_THRESHOLD; 1067 } 1068 1069 static inline int sysctl_sync_period(struct netns_ipvs *ipvs) 1070 { 1071 return DEFAULT_SYNC_PERIOD; 1072 } 1073 1074 static inline unsigned int sysctl_sync_refresh_period(struct netns_ipvs *ipvs) 1075 { 1076 return DEFAULT_SYNC_REFRESH_PERIOD; 1077 } 1078 1079 static inline int sysctl_sync_retries(struct netns_ipvs *ipvs) 1080 { 1081 return DEFAULT_SYNC_RETRIES & 3; 1082 } 1083 1084 static inline int sysctl_sync_ver(struct netns_ipvs *ipvs) 1085 { 1086 return DEFAULT_SYNC_VER; 1087 } 1088 1089 static inline int sysctl_sloppy_tcp(struct netns_ipvs *ipvs) 1090 { 1091 return DEFAULT_SLOPPY_TCP; 1092 } 1093 1094 static inline int sysctl_sloppy_sctp(struct netns_ipvs *ipvs) 1095 { 1096 return DEFAULT_SLOPPY_SCTP; 1097 } 1098 1099 static inline int sysctl_sync_ports(struct netns_ipvs *ipvs) 1100 { 1101 return 1; 1102 } 1103 1104 static inline int sysctl_sync_persist_mode(struct netns_ipvs *ipvs) 1105 { 1106 return 0; 1107 } 1108 1109 static inline unsigned long 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 static inline int sysctl_conn_reuse_mode(struct netns_ipvs *ipvs) 1130 { 1131 return 1; 1132 } 1133 1134 static inline int sysctl_schedule_icmp(struct netns_ipvs *ipvs) 1135 { 1136 return 0; 1137 } 1138 1139 static inline int sysctl_ignore_tunneled(struct netns_ipvs *ipvs) 1140 { 1141 return 0; 1142 } 1143 1144 static inline int sysctl_cache_bypass(struct netns_ipvs *ipvs) 1145 { 1146 return 0; 1147 } 1148 1149 #endif 1150 1151 /* IPVS core functions 1152 * (from ip_vs_core.c) 1153 */ 1154 const char *ip_vs_proto_name(unsigned int proto); 1155 void ip_vs_init_hash_table(struct list_head *table, int rows); 1156 struct ip_vs_conn *ip_vs_new_conn_out(struct ip_vs_service *svc, 1157 struct ip_vs_dest *dest, 1158 struct sk_buff *skb, 1159 const struct ip_vs_iphdr *iph, 1160 __be16 dport, 1161 __be16 cport); 1162 #define IP_VS_INIT_HASH_TABLE(t) ip_vs_init_hash_table((t), ARRAY_SIZE((t))) 1163 1164 #define IP_VS_APP_TYPE_FTP 1 1165 1166 /* ip_vs_conn handling functions 1167 * (from ip_vs_conn.c) 1168 */ 1169 enum { 1170 IP_VS_DIR_INPUT = 0, 1171 IP_VS_DIR_OUTPUT, 1172 IP_VS_DIR_INPUT_ONLY, 1173 IP_VS_DIR_LAST, 1174 }; 1175 1176 static inline void ip_vs_conn_fill_param(struct netns_ipvs *ipvs, int af, int protocol, 1177 const union nf_inet_addr *caddr, 1178 __be16 cport, 1179 const union nf_inet_addr *vaddr, 1180 __be16 vport, 1181 struct ip_vs_conn_param *p) 1182 { 1183 p->ipvs = ipvs; 1184 p->af = af; 1185 p->protocol = protocol; 1186 p->caddr = caddr; 1187 p->cport = cport; 1188 p->vaddr = vaddr; 1189 p->vport = vport; 1190 p->pe = NULL; 1191 p->pe_data = NULL; 1192 } 1193 1194 struct ip_vs_conn *ip_vs_conn_in_get(const struct ip_vs_conn_param *p); 1195 struct ip_vs_conn *ip_vs_ct_in_get(const struct ip_vs_conn_param *p); 1196 1197 struct ip_vs_conn * ip_vs_conn_in_get_proto(struct netns_ipvs *ipvs, int af, 1198 const struct sk_buff *skb, 1199 const struct ip_vs_iphdr *iph); 1200 1201 struct ip_vs_conn *ip_vs_conn_out_get(const struct ip_vs_conn_param *p); 1202 1203 struct ip_vs_conn * ip_vs_conn_out_get_proto(struct netns_ipvs *ipvs, int af, 1204 const struct sk_buff *skb, 1205 const struct ip_vs_iphdr *iph); 1206 1207 /* Get reference to gain full access to conn. 1208 * By default, RCU read-side critical sections have access only to 1209 * conn fields and its PE data, see ip_vs_conn_rcu_free() for reference. 1210 */ 1211 static inline bool __ip_vs_conn_get(struct ip_vs_conn *cp) 1212 { 1213 return refcount_inc_not_zero(&cp->refcnt); 1214 } 1215 1216 /* put back the conn without restarting its timer */ 1217 static inline void __ip_vs_conn_put(struct ip_vs_conn *cp) 1218 { 1219 smp_mb__before_atomic(); 1220 refcount_dec(&cp->refcnt); 1221 } 1222 void ip_vs_conn_put(struct ip_vs_conn *cp); 1223 void ip_vs_conn_fill_cport(struct ip_vs_conn *cp, __be16 cport); 1224 1225 struct ip_vs_conn *ip_vs_conn_new(const struct ip_vs_conn_param *p, int dest_af, 1226 const union nf_inet_addr *daddr, 1227 __be16 dport, unsigned int flags, 1228 struct ip_vs_dest *dest, __u32 fwmark); 1229 void ip_vs_conn_expire_now(struct ip_vs_conn *cp); 1230 1231 const char *ip_vs_state_name(const struct ip_vs_conn *cp); 1232 1233 void ip_vs_tcp_conn_listen(struct ip_vs_conn *cp); 1234 int ip_vs_check_template(struct ip_vs_conn *ct, struct ip_vs_dest *cdest); 1235 void ip_vs_random_dropentry(struct netns_ipvs *ipvs); 1236 int ip_vs_conn_init(void); 1237 void ip_vs_conn_cleanup(void); 1238 1239 static inline void ip_vs_control_del(struct ip_vs_conn *cp) 1240 { 1241 struct ip_vs_conn *ctl_cp = cp->control; 1242 if (!ctl_cp) { 1243 IP_VS_ERR_BUF("request control DEL for uncontrolled: " 1244 "%s:%d to %s:%d\n", 1245 IP_VS_DBG_ADDR(cp->af, &cp->caddr), 1246 ntohs(cp->cport), 1247 IP_VS_DBG_ADDR(cp->af, &cp->vaddr), 1248 ntohs(cp->vport)); 1249 1250 return; 1251 } 1252 1253 IP_VS_DBG_BUF(7, "DELeting control for: " 1254 "cp.dst=%s:%d ctl_cp.dst=%s:%d\n", 1255 IP_VS_DBG_ADDR(cp->af, &cp->caddr), 1256 ntohs(cp->cport), 1257 IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr), 1258 ntohs(ctl_cp->cport)); 1259 1260 cp->control = NULL; 1261 if (atomic_read(&ctl_cp->n_control) == 0) { 1262 IP_VS_ERR_BUF("BUG control DEL with n=0 : " 1263 "%s:%d to %s:%d\n", 1264 IP_VS_DBG_ADDR(cp->af, &cp->caddr), 1265 ntohs(cp->cport), 1266 IP_VS_DBG_ADDR(cp->af, &cp->vaddr), 1267 ntohs(cp->vport)); 1268 1269 return; 1270 } 1271 atomic_dec(&ctl_cp->n_control); 1272 } 1273 1274 static inline void 1275 ip_vs_control_add(struct ip_vs_conn *cp, struct ip_vs_conn *ctl_cp) 1276 { 1277 if (cp->control) { 1278 IP_VS_ERR_BUF("request control ADD for already controlled: " 1279 "%s:%d to %s:%d\n", 1280 IP_VS_DBG_ADDR(cp->af, &cp->caddr), 1281 ntohs(cp->cport), 1282 IP_VS_DBG_ADDR(cp->af, &cp->vaddr), 1283 ntohs(cp->vport)); 1284 1285 ip_vs_control_del(cp); 1286 } 1287 1288 IP_VS_DBG_BUF(7, "ADDing control for: " 1289 "cp.dst=%s:%d ctl_cp.dst=%s:%d\n", 1290 IP_VS_DBG_ADDR(cp->af, &cp->caddr), 1291 ntohs(cp->cport), 1292 IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr), 1293 ntohs(ctl_cp->cport)); 1294 1295 cp->control = ctl_cp; 1296 atomic_inc(&ctl_cp->n_control); 1297 } 1298 1299 /* Mark our template as assured */ 1300 static inline void 1301 ip_vs_control_assure_ct(struct ip_vs_conn *cp) 1302 { 1303 struct ip_vs_conn *ct = cp->control; 1304 1305 if (ct && !(ct->state & IP_VS_CTPL_S_ASSURED) && 1306 (ct->flags & IP_VS_CONN_F_TEMPLATE)) 1307 ct->state |= IP_VS_CTPL_S_ASSURED; 1308 } 1309 1310 /* IPVS netns init & cleanup functions */ 1311 int ip_vs_estimator_net_init(struct netns_ipvs *ipvs); 1312 int ip_vs_control_net_init(struct netns_ipvs *ipvs); 1313 int ip_vs_protocol_net_init(struct netns_ipvs *ipvs); 1314 int ip_vs_app_net_init(struct netns_ipvs *ipvs); 1315 int ip_vs_conn_net_init(struct netns_ipvs *ipvs); 1316 int ip_vs_sync_net_init(struct netns_ipvs *ipvs); 1317 void ip_vs_conn_net_cleanup(struct netns_ipvs *ipvs); 1318 void ip_vs_app_net_cleanup(struct netns_ipvs *ipvs); 1319 void ip_vs_protocol_net_cleanup(struct netns_ipvs *ipvs); 1320 void ip_vs_control_net_cleanup(struct netns_ipvs *ipvs); 1321 void ip_vs_estimator_net_cleanup(struct netns_ipvs *ipvs); 1322 void ip_vs_sync_net_cleanup(struct netns_ipvs *ipvs); 1323 void ip_vs_service_net_cleanup(struct netns_ipvs *ipvs); 1324 1325 /* IPVS application functions 1326 * (from ip_vs_app.c) 1327 */ 1328 #define IP_VS_APP_MAX_PORTS 8 1329 struct ip_vs_app *register_ip_vs_app(struct netns_ipvs *ipvs, struct ip_vs_app *app); 1330 void unregister_ip_vs_app(struct netns_ipvs *ipvs, struct ip_vs_app *app); 1331 int ip_vs_bind_app(struct ip_vs_conn *cp, struct ip_vs_protocol *pp); 1332 void ip_vs_unbind_app(struct ip_vs_conn *cp); 1333 int register_ip_vs_app_inc(struct netns_ipvs *ipvs, struct ip_vs_app *app, __u16 proto, 1334 __u16 port); 1335 int ip_vs_app_inc_get(struct ip_vs_app *inc); 1336 void ip_vs_app_inc_put(struct ip_vs_app *inc); 1337 1338 int ip_vs_app_pkt_out(struct ip_vs_conn *, struct sk_buff *skb, 1339 struct ip_vs_iphdr *ipvsh); 1340 int ip_vs_app_pkt_in(struct ip_vs_conn *, struct sk_buff *skb, 1341 struct ip_vs_iphdr *ipvsh); 1342 1343 int register_ip_vs_pe(struct ip_vs_pe *pe); 1344 int unregister_ip_vs_pe(struct ip_vs_pe *pe); 1345 struct ip_vs_pe *ip_vs_pe_getbyname(const char *name); 1346 struct ip_vs_pe *__ip_vs_pe_getbyname(const char *pe_name); 1347 1348 /* Use a #define to avoid all of module.h just for these trivial ops */ 1349 #define ip_vs_pe_get(pe) \ 1350 if (pe && pe->module) \ 1351 __module_get(pe->module); 1352 1353 #define ip_vs_pe_put(pe) \ 1354 if (pe && pe->module) \ 1355 module_put(pe->module); 1356 1357 /* IPVS protocol functions (from ip_vs_proto.c) */ 1358 int ip_vs_protocol_init(void); 1359 void ip_vs_protocol_cleanup(void); 1360 void ip_vs_protocol_timeout_change(struct netns_ipvs *ipvs, int flags); 1361 int *ip_vs_create_timeout_table(int *table, int size); 1362 void ip_vs_tcpudp_debug_packet(int af, struct ip_vs_protocol *pp, 1363 const struct sk_buff *skb, int offset, 1364 const char *msg); 1365 1366 extern struct ip_vs_protocol ip_vs_protocol_tcp; 1367 extern struct ip_vs_protocol ip_vs_protocol_udp; 1368 extern struct ip_vs_protocol ip_vs_protocol_icmp; 1369 extern struct ip_vs_protocol ip_vs_protocol_esp; 1370 extern struct ip_vs_protocol ip_vs_protocol_ah; 1371 extern struct ip_vs_protocol ip_vs_protocol_sctp; 1372 1373 /* Registering/unregistering scheduler functions 1374 * (from ip_vs_sched.c) 1375 */ 1376 int register_ip_vs_scheduler(struct ip_vs_scheduler *scheduler); 1377 int unregister_ip_vs_scheduler(struct ip_vs_scheduler *scheduler); 1378 int ip_vs_bind_scheduler(struct ip_vs_service *svc, 1379 struct ip_vs_scheduler *scheduler); 1380 void ip_vs_unbind_scheduler(struct ip_vs_service *svc, 1381 struct ip_vs_scheduler *sched); 1382 struct ip_vs_scheduler *ip_vs_scheduler_get(const char *sched_name); 1383 void ip_vs_scheduler_put(struct ip_vs_scheduler *scheduler); 1384 struct ip_vs_conn * 1385 ip_vs_schedule(struct ip_vs_service *svc, struct sk_buff *skb, 1386 struct ip_vs_proto_data *pd, int *ignored, 1387 struct ip_vs_iphdr *iph); 1388 int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb, 1389 struct ip_vs_proto_data *pd, struct ip_vs_iphdr *iph); 1390 1391 void ip_vs_scheduler_err(struct ip_vs_service *svc, const char *msg); 1392 1393 /* IPVS control data and functions (from ip_vs_ctl.c) */ 1394 extern struct ip_vs_stats ip_vs_stats; 1395 extern int sysctl_ip_vs_sync_ver; 1396 1397 struct ip_vs_service * 1398 ip_vs_service_find(struct netns_ipvs *ipvs, int af, __u32 fwmark, __u16 protocol, 1399 const union nf_inet_addr *vaddr, __be16 vport); 1400 1401 bool ip_vs_has_real_service(struct netns_ipvs *ipvs, int af, __u16 protocol, 1402 const union nf_inet_addr *daddr, __be16 dport); 1403 1404 struct ip_vs_dest * 1405 ip_vs_find_real_service(struct netns_ipvs *ipvs, int af, __u16 protocol, 1406 const union nf_inet_addr *daddr, __be16 dport); 1407 1408 int ip_vs_use_count_inc(void); 1409 void ip_vs_use_count_dec(void); 1410 int ip_vs_register_nl_ioctl(void); 1411 void ip_vs_unregister_nl_ioctl(void); 1412 int ip_vs_control_init(void); 1413 void ip_vs_control_cleanup(void); 1414 struct ip_vs_dest * 1415 ip_vs_find_dest(struct netns_ipvs *ipvs, int svc_af, int dest_af, 1416 const union nf_inet_addr *daddr, __be16 dport, 1417 const union nf_inet_addr *vaddr, __be16 vport, 1418 __u16 protocol, __u32 fwmark, __u32 flags); 1419 void ip_vs_try_bind_dest(struct ip_vs_conn *cp); 1420 1421 static inline void ip_vs_dest_hold(struct ip_vs_dest *dest) 1422 { 1423 refcount_inc(&dest->refcnt); 1424 } 1425 1426 static inline void ip_vs_dest_put(struct ip_vs_dest *dest) 1427 { 1428 smp_mb__before_atomic(); 1429 refcount_dec(&dest->refcnt); 1430 } 1431 1432 static inline void ip_vs_dest_put_and_free(struct ip_vs_dest *dest) 1433 { 1434 if (refcount_dec_and_test(&dest->refcnt)) 1435 kfree(dest); 1436 } 1437 1438 /* IPVS sync daemon data and function prototypes 1439 * (from ip_vs_sync.c) 1440 */ 1441 int start_sync_thread(struct netns_ipvs *ipvs, struct ipvs_sync_daemon_cfg *cfg, 1442 int state); 1443 int stop_sync_thread(struct netns_ipvs *ipvs, int state); 1444 void ip_vs_sync_conn(struct netns_ipvs *ipvs, struct ip_vs_conn *cp, int pkts); 1445 1446 /* IPVS rate estimator prototypes (from ip_vs_est.c) */ 1447 void ip_vs_start_estimator(struct netns_ipvs *ipvs, struct ip_vs_stats *stats); 1448 void ip_vs_stop_estimator(struct netns_ipvs *ipvs, struct ip_vs_stats *stats); 1449 void ip_vs_zero_estimator(struct ip_vs_stats *stats); 1450 void ip_vs_read_estimator(struct ip_vs_kstats *dst, struct ip_vs_stats *stats); 1451 1452 /* Various IPVS packet transmitters (from ip_vs_xmit.c) */ 1453 int ip_vs_null_xmit(struct sk_buff *skb, struct ip_vs_conn *cp, 1454 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph); 1455 int ip_vs_bypass_xmit(struct sk_buff *skb, struct ip_vs_conn *cp, 1456 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph); 1457 int ip_vs_nat_xmit(struct sk_buff *skb, struct ip_vs_conn *cp, 1458 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph); 1459 int ip_vs_tunnel_xmit(struct sk_buff *skb, struct ip_vs_conn *cp, 1460 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph); 1461 int ip_vs_dr_xmit(struct sk_buff *skb, struct ip_vs_conn *cp, 1462 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph); 1463 int ip_vs_icmp_xmit(struct sk_buff *skb, struct ip_vs_conn *cp, 1464 struct ip_vs_protocol *pp, int offset, 1465 unsigned int hooknum, struct ip_vs_iphdr *iph); 1466 void ip_vs_dest_dst_rcu_free(struct rcu_head *head); 1467 1468 #ifdef CONFIG_IP_VS_IPV6 1469 int ip_vs_bypass_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp, 1470 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph); 1471 int ip_vs_nat_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp, 1472 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph); 1473 int ip_vs_tunnel_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp, 1474 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph); 1475 int ip_vs_dr_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp, 1476 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph); 1477 int ip_vs_icmp_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp, 1478 struct ip_vs_protocol *pp, int offset, 1479 unsigned int hooknum, struct ip_vs_iphdr *iph); 1480 #endif 1481 1482 #ifdef CONFIG_SYSCTL 1483 /* This is a simple mechanism to ignore packets when 1484 * we are loaded. Just set ip_vs_drop_rate to 'n' and 1485 * we start to drop 1/rate of the packets 1486 */ 1487 static inline int ip_vs_todrop(struct netns_ipvs *ipvs) 1488 { 1489 if (!ipvs->drop_rate) 1490 return 0; 1491 if (--ipvs->drop_counter > 0) 1492 return 0; 1493 ipvs->drop_counter = ipvs->drop_rate; 1494 return 1; 1495 } 1496 #else 1497 static inline int ip_vs_todrop(struct netns_ipvs *ipvs) { return 0; } 1498 #endif 1499 1500 /* ip_vs_fwd_tag returns the forwarding tag of the connection */ 1501 #define IP_VS_FWD_METHOD(cp) (cp->flags & IP_VS_CONN_F_FWD_MASK) 1502 1503 static inline char ip_vs_fwd_tag(struct ip_vs_conn *cp) 1504 { 1505 char fwd; 1506 1507 switch (IP_VS_FWD_METHOD(cp)) { 1508 case IP_VS_CONN_F_MASQ: 1509 fwd = 'M'; break; 1510 case IP_VS_CONN_F_LOCALNODE: 1511 fwd = 'L'; break; 1512 case IP_VS_CONN_F_TUNNEL: 1513 fwd = 'T'; break; 1514 case IP_VS_CONN_F_DROUTE: 1515 fwd = 'R'; break; 1516 case IP_VS_CONN_F_BYPASS: 1517 fwd = 'B'; break; 1518 default: 1519 fwd = '?'; break; 1520 } 1521 return fwd; 1522 } 1523 1524 void ip_vs_nat_icmp(struct sk_buff *skb, struct ip_vs_protocol *pp, 1525 struct ip_vs_conn *cp, int dir); 1526 1527 #ifdef CONFIG_IP_VS_IPV6 1528 void ip_vs_nat_icmp_v6(struct sk_buff *skb, struct ip_vs_protocol *pp, 1529 struct ip_vs_conn *cp, int dir); 1530 #endif 1531 1532 __sum16 ip_vs_checksum_complete(struct sk_buff *skb, int offset); 1533 1534 static inline __wsum ip_vs_check_diff4(__be32 old, __be32 new, __wsum oldsum) 1535 { 1536 __be32 diff[2] = { ~old, new }; 1537 1538 return csum_partial(diff, sizeof(diff), oldsum); 1539 } 1540 1541 #ifdef CONFIG_IP_VS_IPV6 1542 static inline __wsum ip_vs_check_diff16(const __be32 *old, const __be32 *new, 1543 __wsum oldsum) 1544 { 1545 __be32 diff[8] = { ~old[3], ~old[2], ~old[1], ~old[0], 1546 new[3], new[2], new[1], new[0] }; 1547 1548 return csum_partial(diff, sizeof(diff), oldsum); 1549 } 1550 #endif 1551 1552 static inline __wsum ip_vs_check_diff2(__be16 old, __be16 new, __wsum oldsum) 1553 { 1554 __be16 diff[2] = { ~old, new }; 1555 1556 return csum_partial(diff, sizeof(diff), oldsum); 1557 } 1558 1559 /* Forget current conntrack (unconfirmed) and attach notrack entry */ 1560 static inline void ip_vs_notrack(struct sk_buff *skb) 1561 { 1562 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) 1563 enum ip_conntrack_info ctinfo; 1564 struct nf_conn *ct = nf_ct_get(skb, &ctinfo); 1565 1566 if (ct) { 1567 nf_conntrack_put(&ct->ct_general); 1568 nf_ct_set(skb, NULL, IP_CT_UNTRACKED); 1569 } 1570 #endif 1571 } 1572 1573 #ifdef CONFIG_IP_VS_NFCT 1574 /* Netfilter connection tracking 1575 * (from ip_vs_nfct.c) 1576 */ 1577 static inline int ip_vs_conntrack_enabled(struct netns_ipvs *ipvs) 1578 { 1579 #ifdef CONFIG_SYSCTL 1580 return ipvs->sysctl_conntrack; 1581 #else 1582 return 0; 1583 #endif 1584 } 1585 1586 void ip_vs_update_conntrack(struct sk_buff *skb, struct ip_vs_conn *cp, 1587 int outin); 1588 int ip_vs_confirm_conntrack(struct sk_buff *skb); 1589 void ip_vs_nfct_expect_related(struct sk_buff *skb, struct nf_conn *ct, 1590 struct ip_vs_conn *cp, u_int8_t proto, 1591 const __be16 port, int from_rs); 1592 void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp); 1593 1594 #else 1595 1596 static inline int ip_vs_conntrack_enabled(struct netns_ipvs *ipvs) 1597 { 1598 return 0; 1599 } 1600 1601 static inline void ip_vs_update_conntrack(struct sk_buff *skb, 1602 struct ip_vs_conn *cp, int outin) 1603 { 1604 } 1605 1606 static inline int ip_vs_confirm_conntrack(struct sk_buff *skb) 1607 { 1608 return NF_ACCEPT; 1609 } 1610 1611 static inline void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp) 1612 { 1613 } 1614 #endif /* CONFIG_IP_VS_NFCT */ 1615 1616 /* Really using conntrack? */ 1617 static inline bool ip_vs_conn_uses_conntrack(struct ip_vs_conn *cp, 1618 struct sk_buff *skb) 1619 { 1620 #ifdef CONFIG_IP_VS_NFCT 1621 enum ip_conntrack_info ctinfo; 1622 struct nf_conn *ct; 1623 1624 if (!(cp->flags & IP_VS_CONN_F_NFCT)) 1625 return false; 1626 ct = nf_ct_get(skb, &ctinfo); 1627 if (ct) 1628 return true; 1629 #endif 1630 return false; 1631 } 1632 1633 static inline int ip_vs_register_conntrack(struct ip_vs_service *svc) 1634 { 1635 #if IS_ENABLED(CONFIG_NF_CONNTRACK) 1636 int afmask = (svc->af == AF_INET6) ? 2 : 1; 1637 int ret = 0; 1638 1639 if (!(svc->conntrack_afmask & afmask)) { 1640 ret = nf_ct_netns_get(svc->ipvs->net, svc->af); 1641 if (ret >= 0) 1642 svc->conntrack_afmask |= afmask; 1643 } 1644 return ret; 1645 #else 1646 return 0; 1647 #endif 1648 } 1649 1650 static inline void ip_vs_unregister_conntrack(struct ip_vs_service *svc) 1651 { 1652 #if IS_ENABLED(CONFIG_NF_CONNTRACK) 1653 int afmask = (svc->af == AF_INET6) ? 2 : 1; 1654 1655 if (svc->conntrack_afmask & afmask) { 1656 nf_ct_netns_put(svc->ipvs->net, svc->af); 1657 svc->conntrack_afmask &= ~afmask; 1658 } 1659 #endif 1660 } 1661 1662 static inline int 1663 ip_vs_dest_conn_overhead(struct ip_vs_dest *dest) 1664 { 1665 /* We think the overhead of processing active connections is 256 1666 * times higher than that of inactive connections in average. (This 1667 * 256 times might not be accurate, we will change it later) We 1668 * use the following formula to estimate the overhead now: 1669 * dest->activeconns*256 + dest->inactconns 1670 */ 1671 return (atomic_read(&dest->activeconns) << 8) + 1672 atomic_read(&dest->inactconns); 1673 } 1674 1675 #endif /* _NET_IP_VS_H */ 1676