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 #include <linux/workqueue.h> 18 19 #include <linux/compiler.h> 20 #include <linux/timer.h> 21 #include <linux/bug.h> 22 23 #include <net/checksum.h> 24 #include <linux/netfilter.h> /* for union nf_inet_addr */ 25 #include <linux/ip.h> 26 #include <linux/ipv6.h> /* for struct ipv6hdr */ 27 #include <net/ipv6.h> 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 #include <linux/sched/isolation.h> 33 34 #define IP_VS_HDR_INVERSE 1 35 #define IP_VS_HDR_ICMP 2 36 37 /* Generic access of ipvs struct */ 38 static inline struct netns_ipvs *net_ipvs(struct net* net) 39 { 40 return net->ipvs; 41 } 42 43 /* Connections' size value needed by ip_vs_ctl.c */ 44 extern int ip_vs_conn_tab_size; 45 46 extern struct mutex __ip_vs_mutex; 47 48 struct ip_vs_iphdr { 49 int hdr_flags; /* ipvs flags */ 50 __u32 off; /* Where IP or IPv4 header starts */ 51 __u32 len; /* IPv4 simply where L4 starts 52 * IPv6 where L4 Transport Header starts */ 53 __u16 fragoffs; /* IPv6 fragment offset, 0 if first frag (or not frag)*/ 54 __s16 protocol; 55 __s32 flags; 56 union nf_inet_addr saddr; 57 union nf_inet_addr daddr; 58 }; 59 60 static inline void *frag_safe_skb_hp(const struct sk_buff *skb, int offset, 61 int len, void *buffer) 62 { 63 return skb_header_pointer(skb, offset, len, buffer); 64 } 65 66 /* This function handles filling *ip_vs_iphdr, both for IPv4 and IPv6. 67 * IPv6 requires some extra work, as finding proper header position, 68 * depend on the IPv6 extension headers. 69 */ 70 static inline int 71 ip_vs_fill_iph_skb_off(int af, const struct sk_buff *skb, int offset, 72 int hdr_flags, struct ip_vs_iphdr *iphdr) 73 { 74 iphdr->hdr_flags = hdr_flags; 75 iphdr->off = offset; 76 77 #ifdef CONFIG_IP_VS_IPV6 78 if (af == AF_INET6) { 79 struct ipv6hdr _iph; 80 const struct ipv6hdr *iph = skb_header_pointer( 81 skb, offset, sizeof(_iph), &_iph); 82 if (!iph) 83 return 0; 84 85 iphdr->saddr.in6 = iph->saddr; 86 iphdr->daddr.in6 = iph->daddr; 87 /* ipv6_find_hdr() updates len, flags */ 88 iphdr->len = offset; 89 iphdr->flags = 0; 90 iphdr->protocol = ipv6_find_hdr(skb, &iphdr->len, -1, 91 &iphdr->fragoffs, 92 &iphdr->flags); 93 if (iphdr->protocol < 0) 94 return 0; 95 } else 96 #endif 97 { 98 struct iphdr _iph; 99 const struct iphdr *iph = skb_header_pointer( 100 skb, offset, sizeof(_iph), &_iph); 101 if (!iph) 102 return 0; 103 104 iphdr->len = offset + iph->ihl * 4; 105 iphdr->fragoffs = 0; 106 iphdr->protocol = iph->protocol; 107 iphdr->saddr.ip = iph->saddr; 108 iphdr->daddr.ip = iph->daddr; 109 } 110 111 return 1; 112 } 113 114 static inline int 115 ip_vs_fill_iph_skb_icmp(int af, const struct sk_buff *skb, int offset, 116 bool inverse, struct ip_vs_iphdr *iphdr) 117 { 118 int hdr_flags = IP_VS_HDR_ICMP; 119 120 if (inverse) 121 hdr_flags |= IP_VS_HDR_INVERSE; 122 123 return ip_vs_fill_iph_skb_off(af, skb, offset, hdr_flags, iphdr); 124 } 125 126 static inline int 127 ip_vs_fill_iph_skb(int af, const struct sk_buff *skb, bool inverse, 128 struct ip_vs_iphdr *iphdr) 129 { 130 int hdr_flags = 0; 131 132 if (inverse) 133 hdr_flags |= IP_VS_HDR_INVERSE; 134 135 return ip_vs_fill_iph_skb_off(af, skb, skb_network_offset(skb), 136 hdr_flags, iphdr); 137 } 138 139 static inline bool 140 ip_vs_iph_inverse(const struct ip_vs_iphdr *iph) 141 { 142 return !!(iph->hdr_flags & IP_VS_HDR_INVERSE); 143 } 144 145 static inline bool 146 ip_vs_iph_icmp(const struct ip_vs_iphdr *iph) 147 { 148 return !!(iph->hdr_flags & IP_VS_HDR_ICMP); 149 } 150 151 static inline void ip_vs_addr_copy(int af, union nf_inet_addr *dst, 152 const union nf_inet_addr *src) 153 { 154 #ifdef CONFIG_IP_VS_IPV6 155 if (af == AF_INET6) 156 dst->in6 = src->in6; 157 else 158 #endif 159 dst->ip = src->ip; 160 } 161 162 static inline void ip_vs_addr_set(int af, union nf_inet_addr *dst, 163 const union nf_inet_addr *src) 164 { 165 #ifdef CONFIG_IP_VS_IPV6 166 if (af == AF_INET6) { 167 dst->in6 = src->in6; 168 return; 169 } 170 #endif 171 dst->ip = src->ip; 172 dst->all[1] = 0; 173 dst->all[2] = 0; 174 dst->all[3] = 0; 175 } 176 177 static inline int ip_vs_addr_equal(int af, const union nf_inet_addr *a, 178 const union nf_inet_addr *b) 179 { 180 #ifdef CONFIG_IP_VS_IPV6 181 if (af == AF_INET6) 182 return ipv6_addr_equal(&a->in6, &b->in6); 183 #endif 184 return a->ip == b->ip; 185 } 186 187 #ifdef CONFIG_IP_VS_DEBUG 188 #include <linux/net.h> 189 190 int ip_vs_get_debug_level(void); 191 192 static inline const char *ip_vs_dbg_addr(int af, char *buf, size_t buf_len, 193 const union nf_inet_addr *addr, 194 int *idx) 195 { 196 int len; 197 #ifdef CONFIG_IP_VS_IPV6 198 if (af == AF_INET6) 199 len = snprintf(&buf[*idx], buf_len - *idx, "[%pI6c]", 200 &addr->in6) + 1; 201 else 202 #endif 203 len = snprintf(&buf[*idx], buf_len - *idx, "%pI4", 204 &addr->ip) + 1; 205 206 *idx += len; 207 BUG_ON(*idx > buf_len + 1); 208 return &buf[*idx - len]; 209 } 210 211 #define IP_VS_DBG_BUF(level, msg, ...) \ 212 do { \ 213 char ip_vs_dbg_buf[160]; \ 214 int ip_vs_dbg_idx = 0; \ 215 if (level <= ip_vs_get_debug_level()) \ 216 printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \ 217 } while (0) 218 #define IP_VS_ERR_BUF(msg...) \ 219 do { \ 220 char ip_vs_dbg_buf[160]; \ 221 int ip_vs_dbg_idx = 0; \ 222 pr_err(msg); \ 223 } while (0) 224 225 /* Only use from within IP_VS_DBG_BUF() or IP_VS_ERR_BUF macros */ 226 #define IP_VS_DBG_ADDR(af, addr) \ 227 ip_vs_dbg_addr(af, ip_vs_dbg_buf, \ 228 sizeof(ip_vs_dbg_buf), addr, \ 229 &ip_vs_dbg_idx) 230 231 #define IP_VS_DBG(level, msg, ...) \ 232 do { \ 233 if (level <= ip_vs_get_debug_level()) \ 234 printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \ 235 } while (0) 236 #define IP_VS_DBG_RL(msg, ...) \ 237 do { \ 238 if (net_ratelimit()) \ 239 printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \ 240 } while (0) 241 #define IP_VS_DBG_PKT(level, af, pp, skb, ofs, msg) \ 242 do { \ 243 if (level <= ip_vs_get_debug_level()) \ 244 pp->debug_packet(af, pp, skb, ofs, msg); \ 245 } while (0) 246 #define IP_VS_DBG_RL_PKT(level, af, pp, skb, ofs, msg) \ 247 do { \ 248 if (level <= ip_vs_get_debug_level() && \ 249 net_ratelimit()) \ 250 pp->debug_packet(af, pp, skb, ofs, msg); \ 251 } while (0) 252 #else /* NO DEBUGGING at ALL */ 253 #define IP_VS_DBG_BUF(level, msg...) do {} while (0) 254 #define IP_VS_ERR_BUF(msg...) do {} while (0) 255 #define IP_VS_DBG(level, msg...) do {} while (0) 256 #define IP_VS_DBG_RL(msg...) do {} while (0) 257 #define IP_VS_DBG_PKT(level, af, pp, skb, ofs, msg) do {} while (0) 258 #define IP_VS_DBG_RL_PKT(level, af, pp, skb, ofs, msg) do {} while (0) 259 #endif 260 261 #define IP_VS_BUG() BUG() 262 #define IP_VS_ERR_RL(msg, ...) \ 263 do { \ 264 if (net_ratelimit()) \ 265 pr_err(msg, ##__VA_ARGS__); \ 266 } while (0) 267 268 /* The port number of FTP service (in network order). */ 269 #define FTPPORT cpu_to_be16(21) 270 #define FTPDATA cpu_to_be16(20) 271 272 /* TCP State Values */ 273 enum { 274 IP_VS_TCP_S_NONE = 0, 275 IP_VS_TCP_S_ESTABLISHED, 276 IP_VS_TCP_S_SYN_SENT, 277 IP_VS_TCP_S_SYN_RECV, 278 IP_VS_TCP_S_FIN_WAIT, 279 IP_VS_TCP_S_TIME_WAIT, 280 IP_VS_TCP_S_CLOSE, 281 IP_VS_TCP_S_CLOSE_WAIT, 282 IP_VS_TCP_S_LAST_ACK, 283 IP_VS_TCP_S_LISTEN, 284 IP_VS_TCP_S_SYNACK, 285 IP_VS_TCP_S_LAST 286 }; 287 288 /* UDP State Values */ 289 enum { 290 IP_VS_UDP_S_NORMAL, 291 IP_VS_UDP_S_LAST, 292 }; 293 294 /* ICMP State Values */ 295 enum { 296 IP_VS_ICMP_S_NORMAL, 297 IP_VS_ICMP_S_LAST, 298 }; 299 300 /* SCTP State Values */ 301 enum ip_vs_sctp_states { 302 IP_VS_SCTP_S_NONE, 303 IP_VS_SCTP_S_INIT1, 304 IP_VS_SCTP_S_INIT, 305 IP_VS_SCTP_S_COOKIE_SENT, 306 IP_VS_SCTP_S_COOKIE_REPLIED, 307 IP_VS_SCTP_S_COOKIE_WAIT, 308 IP_VS_SCTP_S_COOKIE, 309 IP_VS_SCTP_S_COOKIE_ECHOED, 310 IP_VS_SCTP_S_ESTABLISHED, 311 IP_VS_SCTP_S_SHUTDOWN_SENT, 312 IP_VS_SCTP_S_SHUTDOWN_RECEIVED, 313 IP_VS_SCTP_S_SHUTDOWN_ACK_SENT, 314 IP_VS_SCTP_S_REJECTED, 315 IP_VS_SCTP_S_CLOSED, 316 IP_VS_SCTP_S_LAST 317 }; 318 319 /* Connection templates use bits from state */ 320 #define IP_VS_CTPL_S_NONE 0x0000 321 #define IP_VS_CTPL_S_ASSURED 0x0001 322 #define IP_VS_CTPL_S_LAST 0x0002 323 324 /* Delta sequence info structure 325 * Each ip_vs_conn has 2 (output AND input seq. changes). 326 * Only used in the VS/NAT. 327 */ 328 struct ip_vs_seq { 329 __u32 init_seq; /* Add delta from this seq */ 330 __u32 delta; /* Delta in sequence numbers */ 331 __u32 previous_delta; /* Delta in sequence numbers 332 * before last resized pkt */ 333 }; 334 335 /* counters per cpu */ 336 struct ip_vs_counters { 337 u64_stats_t conns; /* connections scheduled */ 338 u64_stats_t inpkts; /* incoming packets */ 339 u64_stats_t outpkts; /* outgoing packets */ 340 u64_stats_t inbytes; /* incoming bytes */ 341 u64_stats_t outbytes; /* outgoing bytes */ 342 }; 343 /* Stats per cpu */ 344 struct ip_vs_cpu_stats { 345 struct ip_vs_counters cnt; 346 struct u64_stats_sync syncp; 347 }; 348 349 /* Default nice for estimator kthreads */ 350 #define IPVS_EST_NICE 0 351 352 /* IPVS statistics objects */ 353 struct ip_vs_estimator { 354 struct hlist_node list; 355 356 u64 last_inbytes; 357 u64 last_outbytes; 358 u64 last_conns; 359 u64 last_inpkts; 360 u64 last_outpkts; 361 362 u64 cps; 363 u64 inpps; 364 u64 outpps; 365 u64 inbps; 366 u64 outbps; 367 368 s32 ktid:16, /* kthread ID, -1=temp list */ 369 ktrow:8, /* row/tick ID for kthread */ 370 ktcid:8; /* chain ID for kthread tick */ 371 }; 372 373 /* 374 * IPVS statistics object, 64-bit kernel version of struct ip_vs_stats_user 375 */ 376 struct ip_vs_kstats { 377 u64 conns; /* connections scheduled */ 378 u64 inpkts; /* incoming packets */ 379 u64 outpkts; /* outgoing packets */ 380 u64 inbytes; /* incoming bytes */ 381 u64 outbytes; /* outgoing bytes */ 382 383 u64 cps; /* current connection rate */ 384 u64 inpps; /* current in packet rate */ 385 u64 outpps; /* current out packet rate */ 386 u64 inbps; /* current in byte rate */ 387 u64 outbps; /* current out byte rate */ 388 }; 389 390 struct ip_vs_stats { 391 struct ip_vs_kstats kstats; /* kernel statistics */ 392 struct ip_vs_estimator est; /* estimator */ 393 struct ip_vs_cpu_stats __percpu *cpustats; /* per cpu counters */ 394 spinlock_t lock; /* spin lock */ 395 struct ip_vs_kstats kstats0; /* reset values */ 396 }; 397 398 struct ip_vs_stats_rcu { 399 struct ip_vs_stats s; 400 struct rcu_head rcu_head; 401 }; 402 403 int ip_vs_stats_init_alloc(struct ip_vs_stats *s); 404 struct ip_vs_stats *ip_vs_stats_alloc(void); 405 void ip_vs_stats_release(struct ip_vs_stats *stats); 406 void ip_vs_stats_free(struct ip_vs_stats *stats); 407 408 /* Process estimators in multiple timer ticks (20/50/100, see ktrow) */ 409 #define IPVS_EST_NTICKS 50 410 /* Estimation uses a 2-second period containing ticks (in jiffies) */ 411 #define IPVS_EST_TICK ((2 * HZ) / IPVS_EST_NTICKS) 412 413 /* Limit of CPU load per kthread (8 for 12.5%), ratio of CPU capacity (1/C). 414 * Value of 4 and above ensures kthreads will take work without exceeding 415 * the CPU capacity under different circumstances. 416 */ 417 #define IPVS_EST_LOAD_DIVISOR 8 418 419 /* Kthreads should not have work that exceeds the CPU load above 50% */ 420 #define IPVS_EST_CPU_KTHREADS (IPVS_EST_LOAD_DIVISOR / 2) 421 422 /* Desired number of chains per timer tick (chain load factor in 100us units), 423 * 48=4.8ms of 40ms tick (12% CPU usage): 424 * 2 sec * 1000 ms in sec * 10 (100us in ms) / 8 (12.5%) / 50 425 */ 426 #define IPVS_EST_CHAIN_FACTOR \ 427 ALIGN_DOWN(2 * 1000 * 10 / IPVS_EST_LOAD_DIVISOR / IPVS_EST_NTICKS, 8) 428 429 /* Compiled number of chains per tick 430 * The defines should match cond_resched_rcu 431 */ 432 #if defined(CONFIG_DEBUG_ATOMIC_SLEEP) || !defined(CONFIG_PREEMPT_RCU) 433 #define IPVS_EST_TICK_CHAINS IPVS_EST_CHAIN_FACTOR 434 #else 435 #define IPVS_EST_TICK_CHAINS 1 436 #endif 437 438 #if IPVS_EST_NTICKS > 127 439 #error Too many timer ticks for ktrow 440 #endif 441 442 /* Multiple chains processed in same tick */ 443 struct ip_vs_est_tick_data { 444 struct rcu_head rcu_head; 445 struct hlist_head chains[IPVS_EST_TICK_CHAINS]; 446 DECLARE_BITMAP(present, IPVS_EST_TICK_CHAINS); 447 DECLARE_BITMAP(full, IPVS_EST_TICK_CHAINS); 448 int chain_len[IPVS_EST_TICK_CHAINS]; 449 }; 450 451 /* Context for estimation kthread */ 452 struct ip_vs_est_kt_data { 453 struct netns_ipvs *ipvs; 454 struct task_struct *task; /* task if running */ 455 struct ip_vs_est_tick_data __rcu *ticks[IPVS_EST_NTICKS]; 456 DECLARE_BITMAP(avail, IPVS_EST_NTICKS); /* tick has space for ests */ 457 unsigned long est_timer; /* estimation timer (jiffies) */ 458 struct ip_vs_stats *calc_stats; /* Used for calculation */ 459 int tick_len[IPVS_EST_NTICKS]; /* est count */ 460 int id; /* ktid per netns */ 461 int chain_max; /* max ests per tick chain */ 462 int tick_max; /* max ests per tick */ 463 int est_count; /* attached ests to kthread */ 464 int est_max_count; /* max ests per kthread */ 465 int add_row; /* row for new ests */ 466 int est_row; /* estimated row */ 467 }; 468 469 struct dst_entry; 470 struct iphdr; 471 struct ip_vs_conn; 472 struct ip_vs_app; 473 struct sk_buff; 474 struct ip_vs_proto_data; 475 476 struct ip_vs_protocol { 477 struct ip_vs_protocol *next; 478 char *name; 479 u16 protocol; 480 u16 num_states; 481 int dont_defrag; 482 483 void (*init)(struct ip_vs_protocol *pp); 484 485 void (*exit)(struct ip_vs_protocol *pp); 486 487 int (*init_netns)(struct netns_ipvs *ipvs, struct ip_vs_proto_data *pd); 488 489 void (*exit_netns)(struct netns_ipvs *ipvs, struct ip_vs_proto_data *pd); 490 491 int (*conn_schedule)(struct netns_ipvs *ipvs, 492 int af, struct sk_buff *skb, 493 struct ip_vs_proto_data *pd, 494 int *verdict, struct ip_vs_conn **cpp, 495 struct ip_vs_iphdr *iph); 496 497 struct ip_vs_conn * 498 (*conn_in_get)(struct netns_ipvs *ipvs, 499 int af, 500 const struct sk_buff *skb, 501 const struct ip_vs_iphdr *iph); 502 503 struct ip_vs_conn * 504 (*conn_out_get)(struct netns_ipvs *ipvs, 505 int af, 506 const struct sk_buff *skb, 507 const struct ip_vs_iphdr *iph); 508 509 int (*snat_handler)(struct sk_buff *skb, struct ip_vs_protocol *pp, 510 struct ip_vs_conn *cp, struct ip_vs_iphdr *iph); 511 512 int (*dnat_handler)(struct sk_buff *skb, struct ip_vs_protocol *pp, 513 struct ip_vs_conn *cp, struct ip_vs_iphdr *iph); 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 netns_ipvs *ipvs, struct ip_vs_app *inc); 522 523 void (*unregister_app)(struct netns_ipvs *ipvs, 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 /* protocol data per netns */ 536 struct ip_vs_proto_data { 537 struct ip_vs_proto_data *next; 538 struct ip_vs_protocol *pp; 539 int *timeout_table; /* protocol timeout table */ 540 atomic_t appcnt; /* counter of proto app incs. */ 541 struct tcp_states_t *tcp_state_table; 542 }; 543 544 struct ip_vs_protocol *ip_vs_proto_get(unsigned short proto); 545 struct ip_vs_proto_data *ip_vs_proto_data_get(struct netns_ipvs *ipvs, 546 unsigned short proto); 547 548 struct ip_vs_conn_param { 549 struct netns_ipvs *ipvs; 550 const union nf_inet_addr *caddr; 551 const union nf_inet_addr *vaddr; 552 __be16 cport; 553 __be16 vport; 554 __u16 protocol; 555 u16 af; 556 557 const struct ip_vs_pe *pe; 558 char *pe_data; 559 __u8 pe_data_len; 560 }; 561 562 /* IP_VS structure allocated for each dynamically scheduled connection */ 563 struct ip_vs_conn { 564 struct hlist_node c_list; /* hashed list heads */ 565 /* Protocol, addresses and port numbers */ 566 __be16 cport; 567 __be16 dport; 568 __be16 vport; 569 u16 af; /* address family */ 570 union nf_inet_addr caddr; /* client address */ 571 union nf_inet_addr vaddr; /* virtual address */ 572 union nf_inet_addr daddr; /* destination address */ 573 volatile __u32 flags; /* status flags */ 574 __u16 protocol; /* Which protocol (TCP/UDP) */ 575 __u16 daf; /* Address family of the dest */ 576 struct netns_ipvs *ipvs; 577 578 /* counter and timer */ 579 refcount_t refcnt; /* reference count */ 580 struct timer_list timer; /* Expiration timer */ 581 volatile unsigned long timeout; /* timeout */ 582 583 /* Flags and state transition */ 584 spinlock_t lock; /* lock for state transition */ 585 volatile __u16 state; /* state info */ 586 volatile __u16 old_state; /* old state, to be used for 587 * state transition triggered 588 * synchronization 589 */ 590 __u32 fwmark; /* Fire wall mark from skb */ 591 unsigned long sync_endtime; /* jiffies + sent_retries */ 592 593 /* Control members */ 594 struct ip_vs_conn *control; /* Master control connection */ 595 atomic_t n_control; /* Number of controlled ones */ 596 struct ip_vs_dest *dest; /* real server */ 597 atomic_t in_pkts; /* incoming packet counter */ 598 599 /* Packet transmitter for different forwarding methods. If it 600 * mangles the packet, it must return NF_DROP or better NF_STOLEN, 601 * otherwise this must be changed to a sk_buff **. 602 * NF_ACCEPT can be returned when destination is local. 603 */ 604 int (*packet_xmit)(struct sk_buff *skb, struct ip_vs_conn *cp, 605 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph); 606 607 /* Note: we can group the following members into a structure, 608 * in order to save more space, and the following members are 609 * only used in VS/NAT anyway 610 */ 611 struct ip_vs_app *app; /* bound ip_vs_app object */ 612 void *app_data; /* Application private data */ 613 struct_group(sync_conn_opt, 614 struct ip_vs_seq in_seq; /* incoming seq. struct */ 615 struct ip_vs_seq out_seq; /* outgoing seq. struct */ 616 ); 617 618 const struct ip_vs_pe *pe; 619 char *pe_data; 620 __u8 pe_data_len; 621 622 struct rcu_head rcu_head; 623 }; 624 625 /* Extended internal versions of struct ip_vs_service_user and ip_vs_dest_user 626 * for IPv6 support. 627 * 628 * We need these to conveniently pass around service and destination 629 * options, but unfortunately, we also need to keep the old definitions to 630 * maintain userspace backwards compatibility for the setsockopt interface. 631 */ 632 struct ip_vs_service_user_kern { 633 /* virtual service addresses */ 634 u16 af; 635 u16 protocol; 636 union nf_inet_addr addr; /* virtual ip address */ 637 __be16 port; 638 u32 fwmark; /* firewall mark of service */ 639 640 /* virtual service options */ 641 char *sched_name; 642 char *pe_name; 643 unsigned int flags; /* virtual service flags */ 644 unsigned int timeout; /* persistent timeout in sec */ 645 __be32 netmask; /* persistent netmask or plen */ 646 }; 647 648 649 struct ip_vs_dest_user_kern { 650 /* destination server address */ 651 union nf_inet_addr addr; 652 __be16 port; 653 654 /* real server options */ 655 unsigned int conn_flags; /* connection flags */ 656 int weight; /* destination weight */ 657 658 /* thresholds for active connections */ 659 u32 u_threshold; /* upper threshold */ 660 u32 l_threshold; /* lower threshold */ 661 662 /* Address family of addr */ 663 u16 af; 664 665 u16 tun_type; /* tunnel type */ 666 __be16 tun_port; /* tunnel port */ 667 u16 tun_flags; /* tunnel flags */ 668 }; 669 670 671 /* 672 * The information about the virtual service offered to the net and the 673 * forwarding entries. 674 */ 675 struct ip_vs_service { 676 struct hlist_node s_list; /* for normal service table */ 677 struct hlist_node f_list; /* for fwmark-based service table */ 678 atomic_t refcnt; /* reference counter */ 679 680 u16 af; /* address family */ 681 __u16 protocol; /* which protocol (TCP/UDP) */ 682 union nf_inet_addr addr; /* IP address for virtual service */ 683 __be16 port; /* port number for the service */ 684 __u32 fwmark; /* firewall mark of the service */ 685 unsigned int flags; /* service status flags */ 686 unsigned int timeout; /* persistent timeout in ticks */ 687 __be32 netmask; /* grouping granularity, mask/plen */ 688 struct netns_ipvs *ipvs; 689 690 struct list_head destinations; /* real server d-linked list */ 691 __u32 num_dests; /* number of servers */ 692 struct ip_vs_stats stats; /* statistics for the service */ 693 694 /* for scheduling */ 695 struct ip_vs_scheduler __rcu *scheduler; /* bound scheduler object */ 696 spinlock_t sched_lock; /* lock sched_data */ 697 void *sched_data; /* scheduler application data */ 698 699 /* alternate persistence engine */ 700 struct ip_vs_pe __rcu *pe; 701 int conntrack_afmask; 702 703 struct rcu_head rcu_head; 704 }; 705 706 /* Information for cached dst */ 707 struct ip_vs_dest_dst { 708 struct dst_entry *dst_cache; /* destination cache entry */ 709 u32 dst_cookie; 710 union nf_inet_addr dst_saddr; 711 struct rcu_head rcu_head; 712 }; 713 714 /* The real server destination forwarding entry with ip address, port number, 715 * and so on. 716 */ 717 struct ip_vs_dest { 718 struct list_head n_list; /* for the dests in the service */ 719 struct hlist_node d_list; /* for table with all the dests */ 720 721 u16 af; /* address family */ 722 __be16 port; /* port number of the server */ 723 union nf_inet_addr addr; /* IP address of the server */ 724 volatile unsigned int flags; /* dest status flags */ 725 atomic_t conn_flags; /* flags to copy to conn */ 726 atomic_t weight; /* server weight */ 727 atomic_t last_weight; /* server latest weight */ 728 __u16 tun_type; /* tunnel type */ 729 __be16 tun_port; /* tunnel port */ 730 __u16 tun_flags; /* tunnel flags */ 731 732 refcount_t refcnt; /* reference counter */ 733 struct ip_vs_stats stats; /* statistics */ 734 unsigned long idle_start; /* start time, jiffies */ 735 736 /* connection counters and thresholds */ 737 atomic_t activeconns; /* active connections */ 738 atomic_t inactconns; /* inactive connections */ 739 atomic_t persistconns; /* persistent connections */ 740 __u32 u_threshold; /* upper threshold */ 741 __u32 l_threshold; /* lower threshold */ 742 743 /* for destination cache */ 744 spinlock_t dst_lock; /* lock of dst_cache */ 745 struct ip_vs_dest_dst __rcu *dest_dst; /* cached dst info */ 746 747 /* for virtual service */ 748 struct ip_vs_service __rcu *svc; /* service it belongs to */ 749 __u16 protocol; /* which protocol (TCP/UDP) */ 750 __be16 vport; /* virtual port number */ 751 union nf_inet_addr vaddr; /* virtual IP address */ 752 __u32 vfwmark; /* firewall mark of service */ 753 754 struct rcu_head rcu_head; 755 struct list_head t_list; /* in dest_trash */ 756 unsigned int in_rs_table:1; /* we are in rs_table */ 757 }; 758 759 /* The scheduler object */ 760 struct ip_vs_scheduler { 761 struct list_head n_list; /* d-linked list head */ 762 char *name; /* scheduler name */ 763 atomic_t refcnt; /* reference counter */ 764 struct module *module; /* THIS_MODULE/NULL */ 765 766 /* scheduler initializing service */ 767 int (*init_service)(struct ip_vs_service *svc); 768 /* scheduling service finish */ 769 void (*done_service)(struct ip_vs_service *svc); 770 /* dest is linked */ 771 int (*add_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest); 772 /* dest is unlinked */ 773 int (*del_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest); 774 /* dest is updated */ 775 int (*upd_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest); 776 777 /* selecting a server from the given service */ 778 struct ip_vs_dest* (*schedule)(struct ip_vs_service *svc, 779 const struct sk_buff *skb, 780 struct ip_vs_iphdr *iph); 781 }; 782 783 /* The persistence engine object */ 784 struct ip_vs_pe { 785 struct list_head n_list; /* d-linked list head */ 786 char *name; /* scheduler name */ 787 atomic_t refcnt; /* reference counter */ 788 struct module *module; /* THIS_MODULE/NULL */ 789 790 /* get the connection template, if any */ 791 int (*fill_param)(struct ip_vs_conn_param *p, struct sk_buff *skb); 792 bool (*ct_match)(const struct ip_vs_conn_param *p, 793 struct ip_vs_conn *ct); 794 u32 (*hashkey_raw)(const struct ip_vs_conn_param *p, u32 initval, 795 bool inverse); 796 int (*show_pe_data)(const struct ip_vs_conn *cp, char *buf); 797 /* create connections for real-server outgoing packets */ 798 struct ip_vs_conn* (*conn_out)(struct ip_vs_service *svc, 799 struct ip_vs_dest *dest, 800 struct sk_buff *skb, 801 const struct ip_vs_iphdr *iph, 802 __be16 dport, __be16 cport); 803 }; 804 805 /* The application module object (a.k.a. app incarnation) */ 806 struct ip_vs_app { 807 struct list_head a_list; /* member in app list */ 808 int type; /* IP_VS_APP_TYPE_xxx */ 809 char *name; /* application module name */ 810 __u16 protocol; 811 struct module *module; /* THIS_MODULE/NULL */ 812 struct list_head incs_list; /* list of incarnations */ 813 814 /* members for application incarnations */ 815 struct list_head p_list; /* member in proto app list */ 816 struct ip_vs_app *app; /* its real application */ 817 __be16 port; /* port number in net order */ 818 atomic_t usecnt; /* usage counter */ 819 struct rcu_head rcu_head; 820 821 /* output hook: Process packet in inout direction, diff set for TCP. 822 * Return: 0=Error, 1=Payload Not Mangled/Mangled but checksum is ok, 823 * 2=Mangled but checksum was not updated 824 */ 825 int (*pkt_out)(struct ip_vs_app *, struct ip_vs_conn *, 826 struct sk_buff *, int *diff, struct ip_vs_iphdr *ipvsh); 827 828 /* input hook: Process packet in outin direction, diff set for TCP. 829 * Return: 0=Error, 1=Payload Not Mangled/Mangled but checksum is ok, 830 * 2=Mangled but checksum was not updated 831 */ 832 int (*pkt_in)(struct ip_vs_app *, struct ip_vs_conn *, 833 struct sk_buff *, int *diff, struct ip_vs_iphdr *ipvsh); 834 835 /* ip_vs_app initializer */ 836 int (*init_conn)(struct ip_vs_app *, struct ip_vs_conn *); 837 838 /* ip_vs_app finish */ 839 int (*done_conn)(struct ip_vs_app *, struct ip_vs_conn *); 840 841 842 /* not used now */ 843 int (*bind_conn)(struct ip_vs_app *, struct ip_vs_conn *, 844 struct ip_vs_protocol *); 845 846 void (*unbind_conn)(struct ip_vs_app *, struct ip_vs_conn *); 847 848 int * timeout_table; 849 int * timeouts; 850 int timeouts_size; 851 852 int (*conn_schedule)(struct sk_buff *skb, struct ip_vs_app *app, 853 int *verdict, struct ip_vs_conn **cpp); 854 855 struct ip_vs_conn * 856 (*conn_in_get)(const struct sk_buff *skb, struct ip_vs_app *app, 857 const struct iphdr *iph, int inverse); 858 859 struct ip_vs_conn * 860 (*conn_out_get)(const struct sk_buff *skb, struct ip_vs_app *app, 861 const struct iphdr *iph, int inverse); 862 863 int (*state_transition)(struct ip_vs_conn *cp, int direction, 864 const struct sk_buff *skb, 865 struct ip_vs_app *app); 866 867 void (*timeout_change)(struct ip_vs_app *app, int flags); 868 }; 869 870 struct ipvs_master_sync_state { 871 struct list_head sync_queue; 872 struct ip_vs_sync_buff *sync_buff; 873 unsigned long sync_queue_len; 874 unsigned int sync_queue_delay; 875 struct delayed_work master_wakeup_work; 876 struct netns_ipvs *ipvs; 877 }; 878 879 struct ip_vs_sync_thread_data; 880 881 /* How much time to keep dests in trash */ 882 #define IP_VS_DEST_TRASH_PERIOD (120 * HZ) 883 884 struct ipvs_sync_daemon_cfg { 885 union nf_inet_addr mcast_group; 886 int syncid; 887 u16 sync_maxlen; 888 u16 mcast_port; 889 u8 mcast_af; 890 u8 mcast_ttl; 891 /* multicast interface name */ 892 char mcast_ifn[IP_VS_IFNAME_MAXLEN]; 893 }; 894 895 /* IPVS in network namespace */ 896 struct netns_ipvs { 897 int gen; /* Generation */ 898 int enable; /* enable like nf_hooks do */ 899 /* Hash table: for real service lookups */ 900 #define IP_VS_RTAB_BITS 4 901 #define IP_VS_RTAB_SIZE (1 << IP_VS_RTAB_BITS) 902 #define IP_VS_RTAB_MASK (IP_VS_RTAB_SIZE - 1) 903 904 struct hlist_head rs_table[IP_VS_RTAB_SIZE]; 905 /* ip_vs_app */ 906 struct list_head app_list; 907 /* ip_vs_proto */ 908 #define IP_VS_PROTO_TAB_SIZE 32 /* must be power of 2 */ 909 struct ip_vs_proto_data *proto_data_table[IP_VS_PROTO_TAB_SIZE]; 910 /* ip_vs_proto_tcp */ 911 #ifdef CONFIG_IP_VS_PROTO_TCP 912 #define TCP_APP_TAB_BITS 4 913 #define TCP_APP_TAB_SIZE (1 << TCP_APP_TAB_BITS) 914 #define TCP_APP_TAB_MASK (TCP_APP_TAB_SIZE - 1) 915 struct list_head tcp_apps[TCP_APP_TAB_SIZE]; 916 #endif 917 /* ip_vs_proto_udp */ 918 #ifdef CONFIG_IP_VS_PROTO_UDP 919 #define UDP_APP_TAB_BITS 4 920 #define UDP_APP_TAB_SIZE (1 << UDP_APP_TAB_BITS) 921 #define UDP_APP_TAB_MASK (UDP_APP_TAB_SIZE - 1) 922 struct list_head udp_apps[UDP_APP_TAB_SIZE]; 923 #endif 924 /* ip_vs_proto_sctp */ 925 #ifdef CONFIG_IP_VS_PROTO_SCTP 926 #define SCTP_APP_TAB_BITS 4 927 #define SCTP_APP_TAB_SIZE (1 << SCTP_APP_TAB_BITS) 928 #define SCTP_APP_TAB_MASK (SCTP_APP_TAB_SIZE - 1) 929 /* Hash table for SCTP application incarnations */ 930 struct list_head sctp_apps[SCTP_APP_TAB_SIZE]; 931 #endif 932 /* ip_vs_conn */ 933 atomic_t conn_count; /* connection counter */ 934 935 /* ip_vs_ctl */ 936 struct ip_vs_stats_rcu *tot_stats; /* Statistics & est. */ 937 938 int num_services; /* no of virtual services */ 939 int num_services6; /* IPv6 virtual services */ 940 941 /* Trash for destinations */ 942 struct list_head dest_trash; 943 spinlock_t dest_trash_lock; 944 struct timer_list dest_trash_timer; /* expiration timer */ 945 /* Service counters */ 946 atomic_t ftpsvc_counter; 947 atomic_t nullsvc_counter; 948 atomic_t conn_out_counter; 949 950 #ifdef CONFIG_SYSCTL 951 /* delayed work for expiring no dest connections */ 952 struct delayed_work expire_nodest_conn_work; 953 /* 1/rate drop and drop-entry variables */ 954 struct delayed_work defense_work; /* Work handler */ 955 int drop_rate; 956 int drop_counter; 957 int old_secure_tcp; 958 atomic_t dropentry; 959 /* locks in ctl.c */ 960 spinlock_t dropentry_lock; /* drop entry handling */ 961 spinlock_t droppacket_lock; /* drop packet handling */ 962 spinlock_t securetcp_lock; /* state and timeout tables */ 963 964 /* sys-ctl struct */ 965 struct ctl_table_header *sysctl_hdr; 966 struct ctl_table *sysctl_tbl; 967 #endif 968 969 /* sysctl variables */ 970 int sysctl_amemthresh; 971 int sysctl_am_droprate; 972 int sysctl_drop_entry; 973 int sysctl_drop_packet; 974 int sysctl_secure_tcp; 975 #ifdef CONFIG_IP_VS_NFCT 976 int sysctl_conntrack; 977 #endif 978 int sysctl_snat_reroute; 979 int sysctl_sync_ver; 980 int sysctl_sync_ports; 981 int sysctl_sync_persist_mode; 982 unsigned long sysctl_sync_qlen_max; 983 int sysctl_sync_sock_size; 984 int sysctl_cache_bypass; 985 int sysctl_expire_nodest_conn; 986 int sysctl_sloppy_tcp; 987 int sysctl_sloppy_sctp; 988 int sysctl_expire_quiescent_template; 989 int sysctl_sync_threshold[2]; 990 unsigned int sysctl_sync_refresh_period; 991 int sysctl_sync_retries; 992 int sysctl_nat_icmp_send; 993 int sysctl_pmtu_disc; 994 int sysctl_backup_only; 995 int sysctl_conn_reuse_mode; 996 int sysctl_schedule_icmp; 997 int sysctl_ignore_tunneled; 998 int sysctl_run_estimation; 999 #ifdef CONFIG_SYSCTL 1000 cpumask_var_t sysctl_est_cpulist; /* kthread cpumask */ 1001 int est_cpulist_valid; /* cpulist set */ 1002 int sysctl_est_nice; /* kthread nice */ 1003 int est_stopped; /* stop tasks */ 1004 #endif 1005 1006 /* ip_vs_lblc */ 1007 int sysctl_lblc_expiration; 1008 struct ctl_table_header *lblc_ctl_header; 1009 struct ctl_table *lblc_ctl_table; 1010 /* ip_vs_lblcr */ 1011 int sysctl_lblcr_expiration; 1012 struct ctl_table_header *lblcr_ctl_header; 1013 struct ctl_table *lblcr_ctl_table; 1014 /* ip_vs_est */ 1015 struct delayed_work est_reload_work;/* Reload kthread tasks */ 1016 struct mutex est_mutex; /* protect kthread tasks */ 1017 struct hlist_head est_temp_list; /* Ests during calc phase */ 1018 struct ip_vs_est_kt_data **est_kt_arr; /* Array of kthread data ptrs */ 1019 unsigned long est_max_threads;/* Hard limit of kthreads */ 1020 int est_calc_phase; /* Calculation phase */ 1021 int est_chain_max; /* Calculated chain_max */ 1022 int est_kt_count; /* Allocated ptrs */ 1023 int est_add_ktid; /* ktid where to add ests */ 1024 atomic_t est_genid; /* kthreads reload genid */ 1025 atomic_t est_genid_done; /* applied genid */ 1026 /* ip_vs_sync */ 1027 spinlock_t sync_lock; 1028 struct ipvs_master_sync_state *ms; 1029 spinlock_t sync_buff_lock; 1030 struct ip_vs_sync_thread_data *master_tinfo; 1031 struct ip_vs_sync_thread_data *backup_tinfo; 1032 int threads_mask; 1033 volatile int sync_state; 1034 struct mutex sync_mutex; 1035 struct ipvs_sync_daemon_cfg mcfg; /* Master Configuration */ 1036 struct ipvs_sync_daemon_cfg bcfg; /* Backup Configuration */ 1037 /* net name space ptr */ 1038 struct net *net; /* Needed by timer routines */ 1039 /* Number of heterogeneous destinations, needed because heterogeneous 1040 * are not supported when synchronization is enabled. 1041 */ 1042 unsigned int mixed_address_family_dests; 1043 unsigned int hooks_afmask; /* &1=AF_INET, &2=AF_INET6 */ 1044 }; 1045 1046 #define DEFAULT_SYNC_THRESHOLD 3 1047 #define DEFAULT_SYNC_PERIOD 50 1048 #define DEFAULT_SYNC_VER 1 1049 #define DEFAULT_SLOPPY_TCP 0 1050 #define DEFAULT_SLOPPY_SCTP 0 1051 #define DEFAULT_SYNC_REFRESH_PERIOD (0U * HZ) 1052 #define DEFAULT_SYNC_RETRIES 0 1053 #define IPVS_SYNC_WAKEUP_RATE 8 1054 #define IPVS_SYNC_QLEN_MAX (IPVS_SYNC_WAKEUP_RATE * 4) 1055 #define IPVS_SYNC_SEND_DELAY (HZ / 50) 1056 #define IPVS_SYNC_CHECK_PERIOD HZ 1057 #define IPVS_SYNC_FLUSH_TIME (HZ * 2) 1058 #define IPVS_SYNC_PORTS_MAX (1 << 6) 1059 1060 #ifdef CONFIG_SYSCTL 1061 1062 static inline int sysctl_sync_threshold(struct netns_ipvs *ipvs) 1063 { 1064 return ipvs->sysctl_sync_threshold[0]; 1065 } 1066 1067 static inline int sysctl_sync_period(struct netns_ipvs *ipvs) 1068 { 1069 return READ_ONCE(ipvs->sysctl_sync_threshold[1]); 1070 } 1071 1072 static inline unsigned int sysctl_sync_refresh_period(struct netns_ipvs *ipvs) 1073 { 1074 return READ_ONCE(ipvs->sysctl_sync_refresh_period); 1075 } 1076 1077 static inline int sysctl_sync_retries(struct netns_ipvs *ipvs) 1078 { 1079 return ipvs->sysctl_sync_retries; 1080 } 1081 1082 static inline int sysctl_sync_ver(struct netns_ipvs *ipvs) 1083 { 1084 return ipvs->sysctl_sync_ver; 1085 } 1086 1087 static inline int sysctl_sloppy_tcp(struct netns_ipvs *ipvs) 1088 { 1089 return ipvs->sysctl_sloppy_tcp; 1090 } 1091 1092 static inline int sysctl_sloppy_sctp(struct netns_ipvs *ipvs) 1093 { 1094 return ipvs->sysctl_sloppy_sctp; 1095 } 1096 1097 static inline int sysctl_sync_ports(struct netns_ipvs *ipvs) 1098 { 1099 return READ_ONCE(ipvs->sysctl_sync_ports); 1100 } 1101 1102 static inline int sysctl_sync_persist_mode(struct netns_ipvs *ipvs) 1103 { 1104 return ipvs->sysctl_sync_persist_mode; 1105 } 1106 1107 static inline unsigned long sysctl_sync_qlen_max(struct netns_ipvs *ipvs) 1108 { 1109 return ipvs->sysctl_sync_qlen_max; 1110 } 1111 1112 static inline int sysctl_sync_sock_size(struct netns_ipvs *ipvs) 1113 { 1114 return ipvs->sysctl_sync_sock_size; 1115 } 1116 1117 static inline int sysctl_pmtu_disc(struct netns_ipvs *ipvs) 1118 { 1119 return ipvs->sysctl_pmtu_disc; 1120 } 1121 1122 static inline int sysctl_backup_only(struct netns_ipvs *ipvs) 1123 { 1124 return ipvs->sync_state & IP_VS_STATE_BACKUP && 1125 ipvs->sysctl_backup_only; 1126 } 1127 1128 static inline int sysctl_conn_reuse_mode(struct netns_ipvs *ipvs) 1129 { 1130 return ipvs->sysctl_conn_reuse_mode; 1131 } 1132 1133 static inline int sysctl_expire_nodest_conn(struct netns_ipvs *ipvs) 1134 { 1135 return ipvs->sysctl_expire_nodest_conn; 1136 } 1137 1138 static inline int sysctl_schedule_icmp(struct netns_ipvs *ipvs) 1139 { 1140 return ipvs->sysctl_schedule_icmp; 1141 } 1142 1143 static inline int sysctl_ignore_tunneled(struct netns_ipvs *ipvs) 1144 { 1145 return ipvs->sysctl_ignore_tunneled; 1146 } 1147 1148 static inline int sysctl_cache_bypass(struct netns_ipvs *ipvs) 1149 { 1150 return ipvs->sysctl_cache_bypass; 1151 } 1152 1153 static inline int sysctl_run_estimation(struct netns_ipvs *ipvs) 1154 { 1155 return ipvs->sysctl_run_estimation; 1156 } 1157 1158 static inline const struct cpumask *sysctl_est_cpulist(struct netns_ipvs *ipvs) 1159 { 1160 if (ipvs->est_cpulist_valid) 1161 return ipvs->sysctl_est_cpulist; 1162 else 1163 return housekeeping_cpumask(HK_TYPE_KTHREAD); 1164 } 1165 1166 static inline int sysctl_est_nice(struct netns_ipvs *ipvs) 1167 { 1168 return ipvs->sysctl_est_nice; 1169 } 1170 1171 #else 1172 1173 static inline int sysctl_sync_threshold(struct netns_ipvs *ipvs) 1174 { 1175 return DEFAULT_SYNC_THRESHOLD; 1176 } 1177 1178 static inline int sysctl_sync_period(struct netns_ipvs *ipvs) 1179 { 1180 return DEFAULT_SYNC_PERIOD; 1181 } 1182 1183 static inline unsigned int sysctl_sync_refresh_period(struct netns_ipvs *ipvs) 1184 { 1185 return DEFAULT_SYNC_REFRESH_PERIOD; 1186 } 1187 1188 static inline int sysctl_sync_retries(struct netns_ipvs *ipvs) 1189 { 1190 return DEFAULT_SYNC_RETRIES & 3; 1191 } 1192 1193 static inline int sysctl_sync_ver(struct netns_ipvs *ipvs) 1194 { 1195 return DEFAULT_SYNC_VER; 1196 } 1197 1198 static inline int sysctl_sloppy_tcp(struct netns_ipvs *ipvs) 1199 { 1200 return DEFAULT_SLOPPY_TCP; 1201 } 1202 1203 static inline int sysctl_sloppy_sctp(struct netns_ipvs *ipvs) 1204 { 1205 return DEFAULT_SLOPPY_SCTP; 1206 } 1207 1208 static inline int sysctl_sync_ports(struct netns_ipvs *ipvs) 1209 { 1210 return 1; 1211 } 1212 1213 static inline int sysctl_sync_persist_mode(struct netns_ipvs *ipvs) 1214 { 1215 return 0; 1216 } 1217 1218 static inline unsigned long sysctl_sync_qlen_max(struct netns_ipvs *ipvs) 1219 { 1220 return IPVS_SYNC_QLEN_MAX; 1221 } 1222 1223 static inline int sysctl_sync_sock_size(struct netns_ipvs *ipvs) 1224 { 1225 return 0; 1226 } 1227 1228 static inline int sysctl_pmtu_disc(struct netns_ipvs *ipvs) 1229 { 1230 return 1; 1231 } 1232 1233 static inline int sysctl_backup_only(struct netns_ipvs *ipvs) 1234 { 1235 return 0; 1236 } 1237 1238 static inline int sysctl_conn_reuse_mode(struct netns_ipvs *ipvs) 1239 { 1240 return 1; 1241 } 1242 1243 static inline int sysctl_expire_nodest_conn(struct netns_ipvs *ipvs) 1244 { 1245 return 0; 1246 } 1247 1248 static inline int sysctl_schedule_icmp(struct netns_ipvs *ipvs) 1249 { 1250 return 0; 1251 } 1252 1253 static inline int sysctl_ignore_tunneled(struct netns_ipvs *ipvs) 1254 { 1255 return 0; 1256 } 1257 1258 static inline int sysctl_cache_bypass(struct netns_ipvs *ipvs) 1259 { 1260 return 0; 1261 } 1262 1263 static inline int sysctl_run_estimation(struct netns_ipvs *ipvs) 1264 { 1265 return 1; 1266 } 1267 1268 static inline const struct cpumask *sysctl_est_cpulist(struct netns_ipvs *ipvs) 1269 { 1270 return housekeeping_cpumask(HK_TYPE_KTHREAD); 1271 } 1272 1273 static inline int sysctl_est_nice(struct netns_ipvs *ipvs) 1274 { 1275 return IPVS_EST_NICE; 1276 } 1277 1278 #endif 1279 1280 /* IPVS core functions 1281 * (from ip_vs_core.c) 1282 */ 1283 const char *ip_vs_proto_name(unsigned int proto); 1284 void ip_vs_init_hash_table(struct list_head *table, int rows); 1285 struct ip_vs_conn *ip_vs_new_conn_out(struct ip_vs_service *svc, 1286 struct ip_vs_dest *dest, 1287 struct sk_buff *skb, 1288 const struct ip_vs_iphdr *iph, 1289 __be16 dport, 1290 __be16 cport); 1291 #define IP_VS_INIT_HASH_TABLE(t) ip_vs_init_hash_table((t), ARRAY_SIZE((t))) 1292 1293 #define IP_VS_APP_TYPE_FTP 1 1294 1295 /* ip_vs_conn handling functions 1296 * (from ip_vs_conn.c) 1297 */ 1298 enum { 1299 IP_VS_DIR_INPUT = 0, 1300 IP_VS_DIR_OUTPUT, 1301 IP_VS_DIR_INPUT_ONLY, 1302 IP_VS_DIR_LAST, 1303 }; 1304 1305 static inline void ip_vs_conn_fill_param(struct netns_ipvs *ipvs, int af, int protocol, 1306 const union nf_inet_addr *caddr, 1307 __be16 cport, 1308 const union nf_inet_addr *vaddr, 1309 __be16 vport, 1310 struct ip_vs_conn_param *p) 1311 { 1312 p->ipvs = ipvs; 1313 p->af = af; 1314 p->protocol = protocol; 1315 p->caddr = caddr; 1316 p->cport = cport; 1317 p->vaddr = vaddr; 1318 p->vport = vport; 1319 p->pe = NULL; 1320 p->pe_data = NULL; 1321 } 1322 1323 struct ip_vs_conn *ip_vs_conn_in_get(const struct ip_vs_conn_param *p); 1324 struct ip_vs_conn *ip_vs_ct_in_get(const struct ip_vs_conn_param *p); 1325 1326 struct ip_vs_conn * ip_vs_conn_in_get_proto(struct netns_ipvs *ipvs, int af, 1327 const struct sk_buff *skb, 1328 const struct ip_vs_iphdr *iph); 1329 1330 struct ip_vs_conn *ip_vs_conn_out_get(const struct ip_vs_conn_param *p); 1331 1332 struct ip_vs_conn * ip_vs_conn_out_get_proto(struct netns_ipvs *ipvs, int af, 1333 const struct sk_buff *skb, 1334 const struct ip_vs_iphdr *iph); 1335 1336 /* Get reference to gain full access to conn. 1337 * By default, RCU read-side critical sections have access only to 1338 * conn fields and its PE data, see ip_vs_conn_rcu_free() for reference. 1339 */ 1340 static inline bool __ip_vs_conn_get(struct ip_vs_conn *cp) 1341 { 1342 return refcount_inc_not_zero(&cp->refcnt); 1343 } 1344 1345 /* put back the conn without restarting its timer */ 1346 static inline void __ip_vs_conn_put(struct ip_vs_conn *cp) 1347 { 1348 smp_mb__before_atomic(); 1349 refcount_dec(&cp->refcnt); 1350 } 1351 void ip_vs_conn_put(struct ip_vs_conn *cp); 1352 void ip_vs_conn_fill_cport(struct ip_vs_conn *cp, __be16 cport); 1353 1354 struct ip_vs_conn *ip_vs_conn_new(const struct ip_vs_conn_param *p, int dest_af, 1355 const union nf_inet_addr *daddr, 1356 __be16 dport, unsigned int flags, 1357 struct ip_vs_dest *dest, __u32 fwmark); 1358 void ip_vs_conn_expire_now(struct ip_vs_conn *cp); 1359 1360 const char *ip_vs_state_name(const struct ip_vs_conn *cp); 1361 1362 void ip_vs_tcp_conn_listen(struct ip_vs_conn *cp); 1363 int ip_vs_check_template(struct ip_vs_conn *ct, struct ip_vs_dest *cdest); 1364 void ip_vs_random_dropentry(struct netns_ipvs *ipvs); 1365 int ip_vs_conn_init(void); 1366 void ip_vs_conn_cleanup(void); 1367 1368 static inline void ip_vs_control_del(struct ip_vs_conn *cp) 1369 { 1370 struct ip_vs_conn *ctl_cp = cp->control; 1371 if (!ctl_cp) { 1372 IP_VS_ERR_BUF("request control DEL for uncontrolled: " 1373 "%s:%d to %s:%d\n", 1374 IP_VS_DBG_ADDR(cp->af, &cp->caddr), 1375 ntohs(cp->cport), 1376 IP_VS_DBG_ADDR(cp->af, &cp->vaddr), 1377 ntohs(cp->vport)); 1378 1379 return; 1380 } 1381 1382 IP_VS_DBG_BUF(7, "DELeting control for: " 1383 "cp.dst=%s:%d ctl_cp.dst=%s:%d\n", 1384 IP_VS_DBG_ADDR(cp->af, &cp->caddr), 1385 ntohs(cp->cport), 1386 IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr), 1387 ntohs(ctl_cp->cport)); 1388 1389 cp->control = NULL; 1390 if (atomic_read(&ctl_cp->n_control) == 0) { 1391 IP_VS_ERR_BUF("BUG control DEL with n=0 : " 1392 "%s:%d to %s:%d\n", 1393 IP_VS_DBG_ADDR(cp->af, &cp->caddr), 1394 ntohs(cp->cport), 1395 IP_VS_DBG_ADDR(cp->af, &cp->vaddr), 1396 ntohs(cp->vport)); 1397 1398 return; 1399 } 1400 atomic_dec(&ctl_cp->n_control); 1401 } 1402 1403 static inline void 1404 ip_vs_control_add(struct ip_vs_conn *cp, struct ip_vs_conn *ctl_cp) 1405 { 1406 if (cp->control) { 1407 IP_VS_ERR_BUF("request control ADD for already controlled: " 1408 "%s:%d to %s:%d\n", 1409 IP_VS_DBG_ADDR(cp->af, &cp->caddr), 1410 ntohs(cp->cport), 1411 IP_VS_DBG_ADDR(cp->af, &cp->vaddr), 1412 ntohs(cp->vport)); 1413 1414 ip_vs_control_del(cp); 1415 } 1416 1417 IP_VS_DBG_BUF(7, "ADDing control for: " 1418 "cp.dst=%s:%d ctl_cp.dst=%s:%d\n", 1419 IP_VS_DBG_ADDR(cp->af, &cp->caddr), 1420 ntohs(cp->cport), 1421 IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr), 1422 ntohs(ctl_cp->cport)); 1423 1424 cp->control = ctl_cp; 1425 atomic_inc(&ctl_cp->n_control); 1426 } 1427 1428 /* Mark our template as assured */ 1429 static inline void 1430 ip_vs_control_assure_ct(struct ip_vs_conn *cp) 1431 { 1432 struct ip_vs_conn *ct = cp->control; 1433 1434 if (ct && !(ct->state & IP_VS_CTPL_S_ASSURED) && 1435 (ct->flags & IP_VS_CONN_F_TEMPLATE)) 1436 ct->state |= IP_VS_CTPL_S_ASSURED; 1437 } 1438 1439 /* IPVS netns init & cleanup functions */ 1440 int ip_vs_estimator_net_init(struct netns_ipvs *ipvs); 1441 int ip_vs_control_net_init(struct netns_ipvs *ipvs); 1442 int ip_vs_protocol_net_init(struct netns_ipvs *ipvs); 1443 int ip_vs_app_net_init(struct netns_ipvs *ipvs); 1444 int ip_vs_conn_net_init(struct netns_ipvs *ipvs); 1445 int ip_vs_sync_net_init(struct netns_ipvs *ipvs); 1446 void ip_vs_conn_net_cleanup(struct netns_ipvs *ipvs); 1447 void ip_vs_app_net_cleanup(struct netns_ipvs *ipvs); 1448 void ip_vs_protocol_net_cleanup(struct netns_ipvs *ipvs); 1449 void ip_vs_control_net_cleanup(struct netns_ipvs *ipvs); 1450 void ip_vs_estimator_net_cleanup(struct netns_ipvs *ipvs); 1451 void ip_vs_sync_net_cleanup(struct netns_ipvs *ipvs); 1452 void ip_vs_service_nets_cleanup(struct list_head *net_list); 1453 1454 /* IPVS application functions 1455 * (from ip_vs_app.c) 1456 */ 1457 #define IP_VS_APP_MAX_PORTS 8 1458 struct ip_vs_app *register_ip_vs_app(struct netns_ipvs *ipvs, struct ip_vs_app *app); 1459 void unregister_ip_vs_app(struct netns_ipvs *ipvs, struct ip_vs_app *app); 1460 int ip_vs_bind_app(struct ip_vs_conn *cp, struct ip_vs_protocol *pp); 1461 void ip_vs_unbind_app(struct ip_vs_conn *cp); 1462 int register_ip_vs_app_inc(struct netns_ipvs *ipvs, struct ip_vs_app *app, __u16 proto, 1463 __u16 port); 1464 int ip_vs_app_inc_get(struct ip_vs_app *inc); 1465 void ip_vs_app_inc_put(struct ip_vs_app *inc); 1466 1467 int ip_vs_app_pkt_out(struct ip_vs_conn *, struct sk_buff *skb, 1468 struct ip_vs_iphdr *ipvsh); 1469 int ip_vs_app_pkt_in(struct ip_vs_conn *, struct sk_buff *skb, 1470 struct ip_vs_iphdr *ipvsh); 1471 1472 int register_ip_vs_pe(struct ip_vs_pe *pe); 1473 int unregister_ip_vs_pe(struct ip_vs_pe *pe); 1474 struct ip_vs_pe *ip_vs_pe_getbyname(const char *name); 1475 struct ip_vs_pe *__ip_vs_pe_getbyname(const char *pe_name); 1476 1477 /* Use a #define to avoid all of module.h just for these trivial ops */ 1478 #define ip_vs_pe_get(pe) \ 1479 if (pe && pe->module) \ 1480 __module_get(pe->module); 1481 1482 #define ip_vs_pe_put(pe) \ 1483 if (pe && pe->module) \ 1484 module_put(pe->module); 1485 1486 /* IPVS protocol functions (from ip_vs_proto.c) */ 1487 int ip_vs_protocol_init(void); 1488 void ip_vs_protocol_cleanup(void); 1489 void ip_vs_protocol_timeout_change(struct netns_ipvs *ipvs, int flags); 1490 int *ip_vs_create_timeout_table(int *table, int size); 1491 void ip_vs_tcpudp_debug_packet(int af, struct ip_vs_protocol *pp, 1492 const struct sk_buff *skb, int offset, 1493 const char *msg); 1494 1495 extern struct ip_vs_protocol ip_vs_protocol_tcp; 1496 extern struct ip_vs_protocol ip_vs_protocol_udp; 1497 extern struct ip_vs_protocol ip_vs_protocol_icmp; 1498 extern struct ip_vs_protocol ip_vs_protocol_esp; 1499 extern struct ip_vs_protocol ip_vs_protocol_ah; 1500 extern struct ip_vs_protocol ip_vs_protocol_sctp; 1501 1502 /* Registering/unregistering scheduler functions 1503 * (from ip_vs_sched.c) 1504 */ 1505 int register_ip_vs_scheduler(struct ip_vs_scheduler *scheduler); 1506 int unregister_ip_vs_scheduler(struct ip_vs_scheduler *scheduler); 1507 int ip_vs_bind_scheduler(struct ip_vs_service *svc, 1508 struct ip_vs_scheduler *scheduler); 1509 void ip_vs_unbind_scheduler(struct ip_vs_service *svc, 1510 struct ip_vs_scheduler *sched); 1511 struct ip_vs_scheduler *ip_vs_scheduler_get(const char *sched_name); 1512 void ip_vs_scheduler_put(struct ip_vs_scheduler *scheduler); 1513 struct ip_vs_conn * 1514 ip_vs_schedule(struct ip_vs_service *svc, struct sk_buff *skb, 1515 struct ip_vs_proto_data *pd, int *ignored, 1516 struct ip_vs_iphdr *iph); 1517 int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb, 1518 struct ip_vs_proto_data *pd, struct ip_vs_iphdr *iph); 1519 1520 void ip_vs_scheduler_err(struct ip_vs_service *svc, const char *msg); 1521 1522 /* IPVS control data and functions (from ip_vs_ctl.c) */ 1523 extern struct ip_vs_stats ip_vs_stats; 1524 extern int sysctl_ip_vs_sync_ver; 1525 1526 struct ip_vs_service * 1527 ip_vs_service_find(struct netns_ipvs *ipvs, int af, __u32 fwmark, __u16 protocol, 1528 const union nf_inet_addr *vaddr, __be16 vport); 1529 1530 bool ip_vs_has_real_service(struct netns_ipvs *ipvs, int af, __u16 protocol, 1531 const union nf_inet_addr *daddr, __be16 dport); 1532 1533 struct ip_vs_dest * 1534 ip_vs_find_real_service(struct netns_ipvs *ipvs, int af, __u16 protocol, 1535 const union nf_inet_addr *daddr, __be16 dport); 1536 struct ip_vs_dest *ip_vs_find_tunnel(struct netns_ipvs *ipvs, int af, 1537 const union nf_inet_addr *daddr, 1538 __be16 tun_port); 1539 1540 int ip_vs_use_count_inc(void); 1541 void ip_vs_use_count_dec(void); 1542 int ip_vs_register_nl_ioctl(void); 1543 void ip_vs_unregister_nl_ioctl(void); 1544 int ip_vs_control_init(void); 1545 void ip_vs_control_cleanup(void); 1546 struct ip_vs_dest * 1547 ip_vs_find_dest(struct netns_ipvs *ipvs, int svc_af, int dest_af, 1548 const union nf_inet_addr *daddr, __be16 dport, 1549 const union nf_inet_addr *vaddr, __be16 vport, 1550 __u16 protocol, __u32 fwmark, __u32 flags); 1551 void ip_vs_try_bind_dest(struct ip_vs_conn *cp); 1552 1553 static inline void ip_vs_dest_hold(struct ip_vs_dest *dest) 1554 { 1555 refcount_inc(&dest->refcnt); 1556 } 1557 1558 static inline void ip_vs_dest_put(struct ip_vs_dest *dest) 1559 { 1560 smp_mb__before_atomic(); 1561 refcount_dec(&dest->refcnt); 1562 } 1563 1564 static inline void ip_vs_dest_put_and_free(struct ip_vs_dest *dest) 1565 { 1566 if (refcount_dec_and_test(&dest->refcnt)) 1567 kfree(dest); 1568 } 1569 1570 /* IPVS sync daemon data and function prototypes 1571 * (from ip_vs_sync.c) 1572 */ 1573 int start_sync_thread(struct netns_ipvs *ipvs, struct ipvs_sync_daemon_cfg *cfg, 1574 int state); 1575 int stop_sync_thread(struct netns_ipvs *ipvs, int state); 1576 void ip_vs_sync_conn(struct netns_ipvs *ipvs, struct ip_vs_conn *cp, int pkts); 1577 1578 /* IPVS rate estimator prototypes (from ip_vs_est.c) */ 1579 int ip_vs_start_estimator(struct netns_ipvs *ipvs, struct ip_vs_stats *stats); 1580 void ip_vs_stop_estimator(struct netns_ipvs *ipvs, struct ip_vs_stats *stats); 1581 void ip_vs_zero_estimator(struct ip_vs_stats *stats); 1582 void ip_vs_read_estimator(struct ip_vs_kstats *dst, struct ip_vs_stats *stats); 1583 void ip_vs_est_reload_start(struct netns_ipvs *ipvs); 1584 int ip_vs_est_kthread_start(struct netns_ipvs *ipvs, 1585 struct ip_vs_est_kt_data *kd); 1586 void ip_vs_est_kthread_stop(struct ip_vs_est_kt_data *kd); 1587 1588 static inline void ip_vs_est_stopped_recalc(struct netns_ipvs *ipvs) 1589 { 1590 #ifdef CONFIG_SYSCTL 1591 /* Stop tasks while cpulist is empty or if disabled with flag */ 1592 ipvs->est_stopped = !sysctl_run_estimation(ipvs) || 1593 (ipvs->est_cpulist_valid && 1594 cpumask_empty(sysctl_est_cpulist(ipvs))); 1595 #endif 1596 } 1597 1598 static inline bool ip_vs_est_stopped(struct netns_ipvs *ipvs) 1599 { 1600 #ifdef CONFIG_SYSCTL 1601 return ipvs->est_stopped; 1602 #else 1603 return false; 1604 #endif 1605 } 1606 1607 static inline int ip_vs_est_max_threads(struct netns_ipvs *ipvs) 1608 { 1609 unsigned int limit = IPVS_EST_CPU_KTHREADS * 1610 cpumask_weight(sysctl_est_cpulist(ipvs)); 1611 1612 return max(1U, limit); 1613 } 1614 1615 /* Various IPVS packet transmitters (from ip_vs_xmit.c) */ 1616 int ip_vs_null_xmit(struct sk_buff *skb, struct ip_vs_conn *cp, 1617 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph); 1618 int ip_vs_bypass_xmit(struct sk_buff *skb, struct ip_vs_conn *cp, 1619 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph); 1620 int ip_vs_nat_xmit(struct sk_buff *skb, struct ip_vs_conn *cp, 1621 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph); 1622 int ip_vs_tunnel_xmit(struct sk_buff *skb, struct ip_vs_conn *cp, 1623 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph); 1624 int ip_vs_dr_xmit(struct sk_buff *skb, struct ip_vs_conn *cp, 1625 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph); 1626 int ip_vs_icmp_xmit(struct sk_buff *skb, struct ip_vs_conn *cp, 1627 struct ip_vs_protocol *pp, int offset, 1628 unsigned int hooknum, struct ip_vs_iphdr *iph); 1629 void ip_vs_dest_dst_rcu_free(struct rcu_head *head); 1630 1631 #ifdef CONFIG_IP_VS_IPV6 1632 int ip_vs_bypass_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp, 1633 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph); 1634 int ip_vs_nat_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp, 1635 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph); 1636 int ip_vs_tunnel_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp, 1637 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph); 1638 int ip_vs_dr_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp, 1639 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph); 1640 int ip_vs_icmp_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp, 1641 struct ip_vs_protocol *pp, int offset, 1642 unsigned int hooknum, struct ip_vs_iphdr *iph); 1643 #endif 1644 1645 #ifdef CONFIG_SYSCTL 1646 /* This is a simple mechanism to ignore packets when 1647 * we are loaded. Just set ip_vs_drop_rate to 'n' and 1648 * we start to drop 1/rate of the packets 1649 */ 1650 static inline int ip_vs_todrop(struct netns_ipvs *ipvs) 1651 { 1652 if (!ipvs->drop_rate) 1653 return 0; 1654 if (--ipvs->drop_counter > 0) 1655 return 0; 1656 ipvs->drop_counter = ipvs->drop_rate; 1657 return 1; 1658 } 1659 #else 1660 static inline int ip_vs_todrop(struct netns_ipvs *ipvs) { return 0; } 1661 #endif 1662 1663 #ifdef CONFIG_SYSCTL 1664 /* Enqueue delayed work for expiring no dest connections 1665 * Only run when sysctl_expire_nodest=1 1666 */ 1667 static inline void ip_vs_enqueue_expire_nodest_conns(struct netns_ipvs *ipvs) 1668 { 1669 if (sysctl_expire_nodest_conn(ipvs)) 1670 queue_delayed_work(system_long_wq, 1671 &ipvs->expire_nodest_conn_work, 1); 1672 } 1673 1674 void ip_vs_expire_nodest_conn_flush(struct netns_ipvs *ipvs); 1675 #else 1676 static inline void ip_vs_enqueue_expire_nodest_conns(struct netns_ipvs *ipvs) {} 1677 #endif 1678 1679 #define IP_VS_DFWD_METHOD(dest) (atomic_read(&(dest)->conn_flags) & \ 1680 IP_VS_CONN_F_FWD_MASK) 1681 1682 /* ip_vs_fwd_tag returns the forwarding tag of the connection */ 1683 #define IP_VS_FWD_METHOD(cp) (cp->flags & IP_VS_CONN_F_FWD_MASK) 1684 1685 static inline char ip_vs_fwd_tag(struct ip_vs_conn *cp) 1686 { 1687 char fwd; 1688 1689 switch (IP_VS_FWD_METHOD(cp)) { 1690 case IP_VS_CONN_F_MASQ: 1691 fwd = 'M'; break; 1692 case IP_VS_CONN_F_LOCALNODE: 1693 fwd = 'L'; break; 1694 case IP_VS_CONN_F_TUNNEL: 1695 fwd = 'T'; break; 1696 case IP_VS_CONN_F_DROUTE: 1697 fwd = 'R'; break; 1698 case IP_VS_CONN_F_BYPASS: 1699 fwd = 'B'; break; 1700 default: 1701 fwd = '?'; break; 1702 } 1703 return fwd; 1704 } 1705 1706 void ip_vs_nat_icmp(struct sk_buff *skb, struct ip_vs_protocol *pp, 1707 struct ip_vs_conn *cp, int dir); 1708 1709 #ifdef CONFIG_IP_VS_IPV6 1710 void ip_vs_nat_icmp_v6(struct sk_buff *skb, struct ip_vs_protocol *pp, 1711 struct ip_vs_conn *cp, int dir); 1712 #endif 1713 1714 __sum16 ip_vs_checksum_complete(struct sk_buff *skb, int offset); 1715 1716 static inline __wsum ip_vs_check_diff4(__be32 old, __be32 new, __wsum oldsum) 1717 { 1718 __be32 diff[2] = { ~old, new }; 1719 1720 return csum_partial(diff, sizeof(diff), oldsum); 1721 } 1722 1723 #ifdef CONFIG_IP_VS_IPV6 1724 static inline __wsum ip_vs_check_diff16(const __be32 *old, const __be32 *new, 1725 __wsum oldsum) 1726 { 1727 __be32 diff[8] = { ~old[3], ~old[2], ~old[1], ~old[0], 1728 new[3], new[2], new[1], new[0] }; 1729 1730 return csum_partial(diff, sizeof(diff), oldsum); 1731 } 1732 #endif 1733 1734 static inline __wsum ip_vs_check_diff2(__be16 old, __be16 new, __wsum oldsum) 1735 { 1736 __be16 diff[2] = { ~old, new }; 1737 1738 return csum_partial(diff, sizeof(diff), oldsum); 1739 } 1740 1741 /* Forget current conntrack (unconfirmed) and attach notrack entry */ 1742 static inline void ip_vs_notrack(struct sk_buff *skb) 1743 { 1744 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) 1745 enum ip_conntrack_info ctinfo; 1746 struct nf_conn *ct = nf_ct_get(skb, &ctinfo); 1747 1748 if (ct) { 1749 nf_conntrack_put(&ct->ct_general); 1750 nf_ct_set(skb, NULL, IP_CT_UNTRACKED); 1751 } 1752 #endif 1753 } 1754 1755 #ifdef CONFIG_IP_VS_NFCT 1756 /* Netfilter connection tracking 1757 * (from ip_vs_nfct.c) 1758 */ 1759 static inline int ip_vs_conntrack_enabled(struct netns_ipvs *ipvs) 1760 { 1761 #ifdef CONFIG_SYSCTL 1762 return ipvs->sysctl_conntrack; 1763 #else 1764 return 0; 1765 #endif 1766 } 1767 1768 void ip_vs_update_conntrack(struct sk_buff *skb, struct ip_vs_conn *cp, 1769 int outin); 1770 int ip_vs_confirm_conntrack(struct sk_buff *skb); 1771 void ip_vs_nfct_expect_related(struct sk_buff *skb, struct nf_conn *ct, 1772 struct ip_vs_conn *cp, u_int8_t proto, 1773 const __be16 port, int from_rs); 1774 void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp); 1775 1776 #else 1777 1778 static inline int ip_vs_conntrack_enabled(struct netns_ipvs *ipvs) 1779 { 1780 return 0; 1781 } 1782 1783 static inline void ip_vs_update_conntrack(struct sk_buff *skb, 1784 struct ip_vs_conn *cp, int outin) 1785 { 1786 } 1787 1788 static inline int ip_vs_confirm_conntrack(struct sk_buff *skb) 1789 { 1790 return NF_ACCEPT; 1791 } 1792 1793 static inline void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp) 1794 { 1795 } 1796 #endif /* CONFIG_IP_VS_NFCT */ 1797 1798 /* Using old conntrack that can not be redirected to another real server? */ 1799 static inline bool ip_vs_conn_uses_old_conntrack(struct ip_vs_conn *cp, 1800 struct sk_buff *skb) 1801 { 1802 #ifdef CONFIG_IP_VS_NFCT 1803 enum ip_conntrack_info ctinfo; 1804 struct nf_conn *ct; 1805 1806 ct = nf_ct_get(skb, &ctinfo); 1807 if (ct && nf_ct_is_confirmed(ct)) 1808 return true; 1809 #endif 1810 return false; 1811 } 1812 1813 static inline int ip_vs_register_conntrack(struct ip_vs_service *svc) 1814 { 1815 #if IS_ENABLED(CONFIG_NF_CONNTRACK) 1816 int afmask = (svc->af == AF_INET6) ? 2 : 1; 1817 int ret = 0; 1818 1819 if (!(svc->conntrack_afmask & afmask)) { 1820 ret = nf_ct_netns_get(svc->ipvs->net, svc->af); 1821 if (ret >= 0) 1822 svc->conntrack_afmask |= afmask; 1823 } 1824 return ret; 1825 #else 1826 return 0; 1827 #endif 1828 } 1829 1830 static inline void ip_vs_unregister_conntrack(struct ip_vs_service *svc) 1831 { 1832 #if IS_ENABLED(CONFIG_NF_CONNTRACK) 1833 int afmask = (svc->af == AF_INET6) ? 2 : 1; 1834 1835 if (svc->conntrack_afmask & afmask) { 1836 nf_ct_netns_put(svc->ipvs->net, svc->af); 1837 svc->conntrack_afmask &= ~afmask; 1838 } 1839 #endif 1840 } 1841 1842 int ip_vs_register_hooks(struct netns_ipvs *ipvs, unsigned int af); 1843 void ip_vs_unregister_hooks(struct netns_ipvs *ipvs, unsigned int af); 1844 1845 static inline int 1846 ip_vs_dest_conn_overhead(struct ip_vs_dest *dest) 1847 { 1848 /* We think the overhead of processing active connections is 256 1849 * times higher than that of inactive connections in average. (This 1850 * 256 times might not be accurate, we will change it later) We 1851 * use the following formula to estimate the overhead now: 1852 * dest->activeconns*256 + dest->inactconns 1853 */ 1854 return (atomic_read(&dest->activeconns) << 8) + 1855 atomic_read(&dest->inactconns); 1856 } 1857 1858 #ifdef CONFIG_IP_VS_PROTO_TCP 1859 INDIRECT_CALLABLE_DECLARE(int 1860 tcp_snat_handler(struct sk_buff *skb, struct ip_vs_protocol *pp, 1861 struct ip_vs_conn *cp, struct ip_vs_iphdr *iph)); 1862 #endif 1863 1864 #ifdef CONFIG_IP_VS_PROTO_UDP 1865 INDIRECT_CALLABLE_DECLARE(int 1866 udp_snat_handler(struct sk_buff *skb, struct ip_vs_protocol *pp, 1867 struct ip_vs_conn *cp, struct ip_vs_iphdr *iph)); 1868 #endif 1869 #endif /* _NET_IP_VS_H */ 1870