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/rculist_bl.h> /* for struct hlist_bl_head */ 15 #include <linux/spinlock.h> /* for struct rwlock_t */ 16 #include <linux/atomic.h> /* for struct atomic_t */ 17 #include <linux/refcount.h> /* for struct refcount_t */ 18 #include <linux/workqueue.h> 19 20 #include <linux/compiler.h> 21 #include <linux/timer.h> 22 #include <linux/bug.h> 23 24 #include <net/checksum.h> 25 #include <linux/netfilter.h> /* for union nf_inet_addr */ 26 #include <linux/ip.h> 27 #include <linux/ipv6.h> /* for struct ipv6hdr */ 28 #include <net/ipv6.h> 29 #if IS_ENABLED(CONFIG_NF_CONNTRACK) 30 #include <net/netfilter/nf_conntrack.h> 31 #endif 32 #include <net/net_namespace.h> /* Netw namespace */ 33 #include <linux/sched/isolation.h> 34 #include <linux/siphash.h> 35 36 #define IP_VS_HDR_INVERSE 1 37 #define IP_VS_HDR_ICMP 2 38 39 /* conn_tab limits (as per Kconfig) */ 40 #define IP_VS_CONN_TAB_MIN_BITS 8 41 #if BITS_PER_LONG > 32 42 #define IP_VS_CONN_TAB_MAX_BITS 27 43 #else 44 #define IP_VS_CONN_TAB_MAX_BITS 20 45 #endif 46 47 /* svc_table limits */ 48 #define IP_VS_SVC_TAB_MIN_BITS 4 49 #define IP_VS_SVC_TAB_MAX_BITS 20 50 51 /* Generic access of ipvs struct */ 52 static inline struct netns_ipvs *net_ipvs(struct net* net) 53 { 54 return net->ipvs; 55 } 56 57 /* Connections' size value needed by ip_vs_ctl.c */ 58 extern int ip_vs_conn_tab_size; 59 60 struct ip_vs_iphdr { 61 int hdr_flags; /* ipvs flags */ 62 __u32 off; /* Where IP or IPv4 header starts */ 63 __u32 len; /* IPv4 simply where L4 starts 64 * IPv6 where L4 Transport Header starts */ 65 __u16 fragoffs; /* IPv6 fragment offset, 0 if first frag (or not frag)*/ 66 __s16 protocol; 67 __s32 flags; 68 union nf_inet_addr saddr; 69 union nf_inet_addr daddr; 70 }; 71 72 static inline void *frag_safe_skb_hp(const struct sk_buff *skb, int offset, 73 int len, void *buffer) 74 { 75 return skb_header_pointer(skb, offset, len, buffer); 76 } 77 78 /* This function handles filling *ip_vs_iphdr, both for IPv4 and IPv6. 79 * IPv6 requires some extra work, as finding proper header position, 80 * depend on the IPv6 extension headers. 81 */ 82 static inline int 83 ip_vs_fill_iph_skb_off(int af, const struct sk_buff *skb, int offset, 84 int hdr_flags, struct ip_vs_iphdr *iphdr) 85 { 86 iphdr->hdr_flags = hdr_flags; 87 iphdr->off = offset; 88 89 #ifdef CONFIG_IP_VS_IPV6 90 if (af == AF_INET6) { 91 struct ipv6hdr _iph; 92 const struct ipv6hdr *iph = skb_header_pointer( 93 skb, offset, sizeof(_iph), &_iph); 94 if (!iph) 95 return 0; 96 97 iphdr->saddr.in6 = iph->saddr; 98 iphdr->daddr.in6 = iph->daddr; 99 /* ipv6_find_hdr() updates len, flags */ 100 iphdr->len = offset; 101 iphdr->flags = 0; 102 iphdr->protocol = ipv6_find_hdr(skb, &iphdr->len, -1, 103 &iphdr->fragoffs, 104 &iphdr->flags); 105 if (iphdr->protocol < 0) 106 return 0; 107 } else 108 #endif 109 { 110 struct iphdr _iph; 111 const struct iphdr *iph = skb_header_pointer( 112 skb, offset, sizeof(_iph), &_iph); 113 if (!iph) 114 return 0; 115 116 iphdr->len = offset + iph->ihl * 4; 117 iphdr->fragoffs = 0; 118 iphdr->protocol = iph->protocol; 119 iphdr->saddr.ip = iph->saddr; 120 iphdr->daddr.ip = iph->daddr; 121 } 122 123 return 1; 124 } 125 126 static inline int 127 ip_vs_fill_iph_skb_icmp(int af, const struct sk_buff *skb, int offset, 128 bool inverse, struct ip_vs_iphdr *iphdr) 129 { 130 int hdr_flags = IP_VS_HDR_ICMP; 131 132 if (inverse) 133 hdr_flags |= IP_VS_HDR_INVERSE; 134 135 return ip_vs_fill_iph_skb_off(af, skb, offset, hdr_flags, iphdr); 136 } 137 138 static inline int 139 ip_vs_fill_iph_skb(int af, const struct sk_buff *skb, bool inverse, 140 struct ip_vs_iphdr *iphdr) 141 { 142 int hdr_flags = 0; 143 144 if (inverse) 145 hdr_flags |= IP_VS_HDR_INVERSE; 146 147 return ip_vs_fill_iph_skb_off(af, skb, skb_network_offset(skb), 148 hdr_flags, iphdr); 149 } 150 151 static inline bool 152 ip_vs_iph_inverse(const struct ip_vs_iphdr *iph) 153 { 154 return !!(iph->hdr_flags & IP_VS_HDR_INVERSE); 155 } 156 157 static inline bool 158 ip_vs_iph_icmp(const struct ip_vs_iphdr *iph) 159 { 160 return !!(iph->hdr_flags & IP_VS_HDR_ICMP); 161 } 162 163 static inline void ip_vs_addr_copy(int af, union nf_inet_addr *dst, 164 const union nf_inet_addr *src) 165 { 166 #ifdef CONFIG_IP_VS_IPV6 167 if (af == AF_INET6) 168 dst->in6 = src->in6; 169 else 170 #endif 171 dst->ip = src->ip; 172 } 173 174 static inline void ip_vs_addr_set(int af, union nf_inet_addr *dst, 175 const union nf_inet_addr *src) 176 { 177 #ifdef CONFIG_IP_VS_IPV6 178 if (af == AF_INET6) { 179 dst->in6 = src->in6; 180 return; 181 } 182 #endif 183 dst->ip = src->ip; 184 dst->all[1] = 0; 185 dst->all[2] = 0; 186 dst->all[3] = 0; 187 } 188 189 static inline int ip_vs_addr_equal(int af, const union nf_inet_addr *a, 190 const union nf_inet_addr *b) 191 { 192 #ifdef CONFIG_IP_VS_IPV6 193 if (af == AF_INET6) 194 return ipv6_addr_equal(&a->in6, &b->in6); 195 #endif 196 return a->ip == b->ip; 197 } 198 199 #ifdef CONFIG_IP_VS_DEBUG 200 #include <linux/net.h> 201 202 int ip_vs_get_debug_level(void); 203 204 static inline const char *ip_vs_dbg_addr(int af, char *buf, size_t buf_len, 205 const union nf_inet_addr *addr, 206 int *idx) 207 { 208 int len; 209 #ifdef CONFIG_IP_VS_IPV6 210 if (af == AF_INET6) 211 len = snprintf(&buf[*idx], buf_len - *idx, "[%pI6c]", 212 &addr->in6) + 1; 213 else 214 #endif 215 len = snprintf(&buf[*idx], buf_len - *idx, "%pI4", 216 &addr->ip) + 1; 217 218 *idx += len; 219 BUG_ON(*idx > buf_len + 1); 220 return &buf[*idx - len]; 221 } 222 223 #define IP_VS_DBG_BUF(level, msg, ...) \ 224 do { \ 225 char ip_vs_dbg_buf[160]; \ 226 int ip_vs_dbg_idx = 0; \ 227 if (level <= ip_vs_get_debug_level()) \ 228 printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \ 229 } while (0) 230 #define IP_VS_ERR_BUF(msg...) \ 231 do { \ 232 char ip_vs_dbg_buf[160]; \ 233 int ip_vs_dbg_idx = 0; \ 234 pr_err(msg); \ 235 } while (0) 236 237 /* Only use from within IP_VS_DBG_BUF() or IP_VS_ERR_BUF macros */ 238 #define IP_VS_DBG_ADDR(af, addr) \ 239 ip_vs_dbg_addr(af, ip_vs_dbg_buf, \ 240 sizeof(ip_vs_dbg_buf), addr, \ 241 &ip_vs_dbg_idx) 242 243 #define IP_VS_DBG(level, msg, ...) \ 244 do { \ 245 if (level <= ip_vs_get_debug_level()) \ 246 printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \ 247 } while (0) 248 #define IP_VS_DBG_RL(msg, ...) \ 249 do { \ 250 if (net_ratelimit()) \ 251 printk(KERN_DEBUG pr_fmt(msg), ##__VA_ARGS__); \ 252 } while (0) 253 #define IP_VS_DBG_PKT(level, af, pp, skb, ofs, msg) \ 254 do { \ 255 if (level <= ip_vs_get_debug_level()) \ 256 pp->debug_packet(af, pp, skb, ofs, msg); \ 257 } while (0) 258 #define IP_VS_DBG_RL_PKT(level, af, pp, skb, ofs, msg) \ 259 do { \ 260 if (level <= ip_vs_get_debug_level() && \ 261 net_ratelimit()) \ 262 pp->debug_packet(af, pp, skb, ofs, msg); \ 263 } while (0) 264 #else /* NO DEBUGGING at ALL */ 265 #define IP_VS_DBG_BUF(level, msg...) do {} while (0) 266 #define IP_VS_ERR_BUF(msg...) do {} while (0) 267 #define IP_VS_DBG(level, msg...) do {} while (0) 268 #define IP_VS_DBG_RL(msg...) do {} while (0) 269 #define IP_VS_DBG_PKT(level, af, pp, skb, ofs, msg) do {} while (0) 270 #define IP_VS_DBG_RL_PKT(level, af, pp, skb, ofs, msg) do {} while (0) 271 #endif 272 273 #define IP_VS_BUG() BUG() 274 #define IP_VS_ERR_RL(msg, ...) \ 275 do { \ 276 if (net_ratelimit()) \ 277 pr_err(msg, ##__VA_ARGS__); \ 278 } while (0) 279 280 struct ip_vs_aligned_lock { 281 spinlock_t l; /* Protect buckets */ 282 } ____cacheline_aligned_in_smp; 283 284 /* For arrays per family */ 285 enum { 286 IP_VS_AF_INET, 287 IP_VS_AF_INET6, 288 IP_VS_AF_MAX 289 }; 290 291 static inline int ip_vs_af_index(int af) 292 { 293 return af == AF_INET6 ? IP_VS_AF_INET6 : IP_VS_AF_INET; 294 } 295 296 /* work_flags */ 297 enum { 298 IP_VS_WORK_SVC_RESIZE, /* Schedule svc_resize_work */ 299 IP_VS_WORK_SVC_NORESIZE, /* Stopping svc_resize_work */ 300 IP_VS_WORK_CONN_RESIZE, /* Schedule conn_resize_work */ 301 }; 302 303 /* The port number of FTP service (in network order). */ 304 #define FTPPORT cpu_to_be16(21) 305 #define FTPDATA cpu_to_be16(20) 306 307 /* TCP State Values */ 308 enum { 309 IP_VS_TCP_S_NONE = 0, 310 IP_VS_TCP_S_ESTABLISHED, 311 IP_VS_TCP_S_SYN_SENT, 312 IP_VS_TCP_S_SYN_RECV, 313 IP_VS_TCP_S_FIN_WAIT, 314 IP_VS_TCP_S_TIME_WAIT, 315 IP_VS_TCP_S_CLOSE, 316 IP_VS_TCP_S_CLOSE_WAIT, 317 IP_VS_TCP_S_LAST_ACK, 318 IP_VS_TCP_S_LISTEN, 319 IP_VS_TCP_S_SYNACK, 320 IP_VS_TCP_S_LAST 321 }; 322 323 /* UDP State Values */ 324 enum { 325 IP_VS_UDP_S_NORMAL, 326 IP_VS_UDP_S_LAST, 327 }; 328 329 /* ICMP State Values */ 330 enum { 331 IP_VS_ICMP_S_NORMAL, 332 IP_VS_ICMP_S_LAST, 333 }; 334 335 /* SCTP State Values */ 336 enum ip_vs_sctp_states { 337 IP_VS_SCTP_S_NONE, 338 IP_VS_SCTP_S_INIT1, 339 IP_VS_SCTP_S_INIT, 340 IP_VS_SCTP_S_COOKIE_SENT, 341 IP_VS_SCTP_S_COOKIE_REPLIED, 342 IP_VS_SCTP_S_COOKIE_WAIT, 343 IP_VS_SCTP_S_COOKIE, 344 IP_VS_SCTP_S_COOKIE_ECHOED, 345 IP_VS_SCTP_S_ESTABLISHED, 346 IP_VS_SCTP_S_SHUTDOWN_SENT, 347 IP_VS_SCTP_S_SHUTDOWN_RECEIVED, 348 IP_VS_SCTP_S_SHUTDOWN_ACK_SENT, 349 IP_VS_SCTP_S_REJECTED, 350 IP_VS_SCTP_S_CLOSED, 351 IP_VS_SCTP_S_LAST 352 }; 353 354 /* Connection templates use bits from state */ 355 #define IP_VS_CTPL_S_NONE 0x0000 356 #define IP_VS_CTPL_S_ASSURED 0x0001 357 #define IP_VS_CTPL_S_LAST 0x0002 358 359 /* Delta sequence info structure 360 * Each ip_vs_conn has 2 (output AND input seq. changes). 361 * Only used in the VS/NAT. 362 */ 363 struct ip_vs_seq { 364 __u32 init_seq; /* Add delta from this seq */ 365 __u32 delta; /* Delta in sequence numbers */ 366 __u32 previous_delta; /* Delta in sequence numbers 367 * before last resized pkt */ 368 }; 369 370 /* counters per cpu */ 371 struct ip_vs_counters { 372 u64_stats_t conns; /* connections scheduled */ 373 u64_stats_t inpkts; /* incoming packets */ 374 u64_stats_t outpkts; /* outgoing packets */ 375 u64_stats_t inbytes; /* incoming bytes */ 376 u64_stats_t outbytes; /* outgoing bytes */ 377 }; 378 /* Stats per cpu */ 379 struct ip_vs_cpu_stats { 380 struct ip_vs_counters cnt; 381 struct u64_stats_sync syncp; 382 }; 383 384 /* Default nice for estimator kthreads */ 385 #define IPVS_EST_NICE 0 386 387 /* IPVS statistics objects */ 388 struct ip_vs_estimator { 389 struct hlist_node list; 390 391 u64 last_inbytes; 392 u64 last_outbytes; 393 u64 last_conns; 394 u64 last_inpkts; 395 u64 last_outpkts; 396 397 u64 cps; 398 u64 inpps; 399 u64 outpps; 400 u64 inbps; 401 u64 outbps; 402 403 s32 ktid:16, /* kthread ID, -1=temp list */ 404 ktrow:8, /* row/tick ID for kthread */ 405 ktcid:8; /* chain ID for kthread tick */ 406 }; 407 408 /* 409 * IPVS statistics object, 64-bit kernel version of struct ip_vs_stats_user 410 */ 411 struct ip_vs_kstats { 412 u64 conns; /* connections scheduled */ 413 u64 inpkts; /* incoming packets */ 414 u64 outpkts; /* outgoing packets */ 415 u64 inbytes; /* incoming bytes */ 416 u64 outbytes; /* outgoing bytes */ 417 418 u64 cps; /* current connection rate */ 419 u64 inpps; /* current in packet rate */ 420 u64 outpps; /* current out packet rate */ 421 u64 inbps; /* current in byte rate */ 422 u64 outbps; /* current out byte rate */ 423 }; 424 425 struct ip_vs_stats { 426 struct ip_vs_kstats kstats; /* kernel statistics */ 427 struct ip_vs_estimator est; /* estimator */ 428 struct ip_vs_cpu_stats __percpu *cpustats; /* per cpu counters */ 429 spinlock_t lock; /* spin lock */ 430 struct ip_vs_kstats kstats0; /* reset values */ 431 }; 432 433 struct ip_vs_stats_rcu { 434 struct ip_vs_stats s; 435 struct rcu_head rcu_head; 436 }; 437 438 int ip_vs_stats_init_alloc(struct ip_vs_stats *s); 439 struct ip_vs_stats *ip_vs_stats_alloc(void); 440 void ip_vs_stats_release(struct ip_vs_stats *stats); 441 void ip_vs_stats_free(struct ip_vs_stats *stats); 442 443 /* Process estimators in multiple timer ticks (20/50/100, see ktrow) */ 444 #define IPVS_EST_NTICKS 50 445 /* Estimation uses a 2-second period containing ticks (in jiffies) */ 446 #define IPVS_EST_TICK ((2 * HZ) / IPVS_EST_NTICKS) 447 448 /* Limit of CPU load per kthread (8 for 12.5%), ratio of CPU capacity (1/C). 449 * Value of 4 and above ensures kthreads will take work without exceeding 450 * the CPU capacity under different circumstances. 451 */ 452 #define IPVS_EST_LOAD_DIVISOR 8 453 454 /* Kthreads should not have work that exceeds the CPU load above 50% */ 455 #define IPVS_EST_CPU_KTHREADS (IPVS_EST_LOAD_DIVISOR / 2) 456 457 /* Desired number of chains per timer tick (chain load factor in 100us units), 458 * 48=4.8ms of 40ms tick (12% CPU usage): 459 * 2 sec * 1000 ms in sec * 10 (100us in ms) / 8 (12.5%) / 50 460 */ 461 #define IPVS_EST_CHAIN_FACTOR \ 462 ALIGN_DOWN(2 * 1000 * 10 / IPVS_EST_LOAD_DIVISOR / IPVS_EST_NTICKS, 8) 463 464 /* Compiled number of chains per tick 465 * The defines should match cond_resched_rcu 466 */ 467 #if defined(CONFIG_DEBUG_ATOMIC_SLEEP) || !defined(CONFIG_PREEMPT_RCU) 468 #define IPVS_EST_TICK_CHAINS IPVS_EST_CHAIN_FACTOR 469 #else 470 #define IPVS_EST_TICK_CHAINS 1 471 #endif 472 473 #if IPVS_EST_NTICKS > 127 474 #error Too many timer ticks for ktrow 475 #endif 476 477 /* Multiple chains processed in same tick */ 478 struct ip_vs_est_tick_data { 479 struct rcu_head rcu_head; 480 struct hlist_head chains[IPVS_EST_TICK_CHAINS]; 481 DECLARE_BITMAP(present, IPVS_EST_TICK_CHAINS); 482 DECLARE_BITMAP(full, IPVS_EST_TICK_CHAINS); 483 int chain_len[IPVS_EST_TICK_CHAINS]; 484 }; 485 486 /* Context for estimation kthread */ 487 struct ip_vs_est_kt_data { 488 struct netns_ipvs *ipvs; 489 struct task_struct *task; /* task if running */ 490 struct ip_vs_est_tick_data __rcu *ticks[IPVS_EST_NTICKS]; 491 DECLARE_BITMAP(avail, IPVS_EST_NTICKS); /* tick has space for ests */ 492 unsigned long est_timer; /* estimation timer (jiffies) */ 493 struct ip_vs_stats *calc_stats; /* Used for calculation */ 494 int needed; /* task is needed */ 495 int tick_len[IPVS_EST_NTICKS]; /* est count */ 496 int id; /* ktid per netns */ 497 int chain_max; /* max ests per tick chain */ 498 int tick_max; /* max ests per tick */ 499 int est_count; /* attached ests to kthread */ 500 int est_max_count; /* max ests per kthread */ 501 int add_row; /* row for new ests */ 502 int est_row; /* estimated row */ 503 }; 504 505 /* IPVS resizable hash tables */ 506 struct ip_vs_rht { 507 struct hlist_bl_head *buckets; 508 struct ip_vs_rht __rcu *new_tbl; /* New/Same table */ 509 seqcount_t *seqc; /* Protects moves */ 510 struct ip_vs_aligned_lock *lock; /* Protect seqc */ 511 int mask; /* Buckets mask */ 512 int size; /* Buckets */ 513 int seqc_mask; /* seqc mask */ 514 int lock_mask; /* lock mask */ 515 u32 table_id; 516 int u_thresh; /* upper threshold */ 517 int l_thresh; /* lower threshold */ 518 int lfactor; /* Load Factor (shift)*/ 519 int bits; /* size = 1 << bits */ 520 siphash_key_t hash_key; 521 struct rcu_head rcu_head; 522 }; 523 524 /** 525 * ip_vs_rht_for_each_table() - Walk the hash tables 526 * @table: struct ip_vs_rht __rcu *table 527 * @t: current table, used as cursor, struct ip_vs_rht *var 528 * @p: previous table, temp struct ip_vs_rht *var 529 * 530 * Walk tables assuming others can not change the installed tables 531 */ 532 #define ip_vs_rht_for_each_table(table, t, p) \ 533 for (p = NULL, t = rcu_dereference_protected(table, 1); \ 534 t != p; \ 535 p = t, t = rcu_dereference_protected(t->new_tbl, 1)) 536 537 /** 538 * ip_vs_rht_for_each_table_rcu() - Walk the hash tables under RCU reader lock 539 * @table: struct ip_vs_rht __rcu *table 540 * @t: current table, used as cursor, struct ip_vs_rht *var 541 * @p: previous table, temp struct ip_vs_rht *var 542 * 543 * We usually search in one table and also in second table on resizing 544 */ 545 #define ip_vs_rht_for_each_table_rcu(table, t, p) \ 546 for (p = NULL, t = rcu_dereference(table); \ 547 t != p; \ 548 p = t, t = rcu_dereference(t->new_tbl)) 549 550 /** 551 * ip_vs_rht_for_each_bucket() - Walk all table buckets 552 * @t: current table, used as cursor, struct ip_vs_rht *var 553 * @bucket: bucket index, used as cursor, u32 var 554 * @head: bucket address, used as cursor, struct hlist_bl_head *var 555 */ 556 #define ip_vs_rht_for_each_bucket(t, bucket, head) \ 557 for (bucket = 0, head = (t)->buckets; \ 558 bucket < t->size; bucket++, head++) 559 560 /** 561 * ip_vs_rht_for_bucket_retry() - Retry bucket if entries are moved 562 * @t: current table, used as cursor, struct ip_vs_rht *var 563 * @bucket: index of current bucket or hash key 564 * @sc: temp seqcount_t *var 565 * @seq: temp unsigned int var for sequence count 566 * @retry: temp int var 567 */ 568 #define ip_vs_rht_for_bucket_retry(t, bucket, sc, seq, retry) \ 569 for (retry = 1, sc = &(t)->seqc[(bucket) & (t)->seqc_mask]; \ 570 retry && ({ seq = read_seqcount_begin(sc); 1; }); \ 571 retry = read_seqcount_retry(sc, seq)) 572 573 /** 574 * DECLARE_IP_VS_RHT_WALK_BUCKETS_RCU() - Declare variables 575 * 576 * Variables for ip_vs_rht_walk_buckets_rcu 577 */ 578 #define DECLARE_IP_VS_RHT_WALK_BUCKETS_RCU() \ 579 struct ip_vs_rht *_t, *_p; \ 580 unsigned int _seq; \ 581 seqcount_t *_sc; \ 582 u32 _bucket; \ 583 int _retry 584 /** 585 * ip_vs_rht_walk_buckets_rcu() - Walk all buckets under RCU read lock 586 * @table: struct ip_vs_rht __rcu *table 587 * @head: bucket address, used as cursor, struct hlist_bl_head *var 588 * 589 * Can be used while others add/delete/move entries 590 * Not suitable if duplicates are not desired 591 * Possible cases for reader that uses cond_resched_rcu() in the loop: 592 * - new table can not be installed, no need to repeat 593 * - new table can be installed => check and repeat if new table is 594 * installed, needed for !PREEMPT_RCU 595 */ 596 #define ip_vs_rht_walk_buckets_rcu(table, head) \ 597 ip_vs_rht_for_each_table_rcu(table, _t, _p) \ 598 ip_vs_rht_for_each_bucket(_t, _bucket, head) \ 599 ip_vs_rht_for_bucket_retry(_t, _bucket, _sc, \ 600 _seq, _retry) 601 602 /** 603 * DECLARE_IP_VS_RHT_WALK_BUCKET_RCU() - Declare variables 604 * 605 * Variables for ip_vs_rht_walk_bucket_rcu 606 */ 607 #define DECLARE_IP_VS_RHT_WALK_BUCKET_RCU() \ 608 unsigned int _seq; \ 609 seqcount_t *_sc; \ 610 int _retry 611 /** 612 * ip_vs_rht_walk_bucket_rcu() - Walk bucket under RCU read lock 613 * @t: current table, struct ip_vs_rht *var 614 * @bucket: index of current bucket or hash key 615 * @head: bucket address, used as cursor, struct hlist_bl_head *var 616 * 617 * Can be used while others add/delete/move entries 618 * Not suitable if duplicates are not desired 619 * Possible cases for reader that uses cond_resched_rcu() in the loop: 620 * - new table can not be installed, no need to repeat 621 * - new table can be installed => check and repeat if new table is 622 * installed, needed for !PREEMPT_RCU 623 */ 624 #define ip_vs_rht_walk_bucket_rcu(t, bucket, head) \ 625 if (({ head = (t)->buckets + ((bucket) & (t)->mask); 0; })) \ 626 {} \ 627 else \ 628 ip_vs_rht_for_bucket_retry(t, (bucket), _sc, _seq, _retry) 629 630 /** 631 * DECLARE_IP_VS_RHT_WALK_BUCKETS_SAFE_RCU() - Declare variables 632 * 633 * Variables for ip_vs_rht_walk_buckets_safe_rcu 634 */ 635 #define DECLARE_IP_VS_RHT_WALK_BUCKETS_SAFE_RCU() \ 636 struct ip_vs_rht *_t, *_p; \ 637 u32 _bucket 638 /** 639 * ip_vs_rht_walk_buckets_safe_rcu() - Walk all buckets under RCU read lock 640 * @table: struct ip_vs_rht __rcu *table 641 * @head: bucket address, used as cursor, struct hlist_bl_head *var 642 * 643 * Can be used while others add/delete entries but moving is disabled 644 * Using cond_resched_rcu() should be safe if tables do not change 645 */ 646 #define ip_vs_rht_walk_buckets_safe_rcu(table, head) \ 647 ip_vs_rht_for_each_table_rcu(table, _t, _p) \ 648 ip_vs_rht_for_each_bucket(_t, _bucket, head) 649 650 /** 651 * DECLARE_IP_VS_RHT_WALK_BUCKETS() - Declare variables 652 * 653 * Variables for ip_vs_rht_walk_buckets 654 */ 655 #define DECLARE_IP_VS_RHT_WALK_BUCKETS() \ 656 struct ip_vs_rht *_t, *_p; \ 657 u32 _bucket 658 659 /** 660 * ip_vs_rht_walk_buckets() - Walk all buckets 661 * @table: struct ip_vs_rht __rcu *table 662 * @head: bucket address, used as cursor, struct hlist_bl_head *var 663 * 664 * Use if others can not add/delete/move entries 665 */ 666 #define ip_vs_rht_walk_buckets(table, head) \ 667 ip_vs_rht_for_each_table(table, _t, _p) \ 668 ip_vs_rht_for_each_bucket(_t, _bucket, head) 669 670 /* Entries can be in one of two tables, so we flip bit when new table is 671 * created and store it as highest bit in hash keys 672 */ 673 #define IP_VS_RHT_TABLE_ID_MASK BIT(31) 674 675 /* Check if hash key is from this table */ 676 static inline bool ip_vs_rht_same_table(struct ip_vs_rht *t, u32 hash_key) 677 { 678 return !((t->table_id ^ hash_key) & IP_VS_RHT_TABLE_ID_MASK); 679 } 680 681 /* Build per-table hash key from hash value */ 682 static inline u32 ip_vs_rht_build_hash_key(struct ip_vs_rht *t, u32 hash) 683 { 684 return t->table_id | (hash & ~IP_VS_RHT_TABLE_ID_MASK); 685 } 686 687 void ip_vs_rht_free(struct ip_vs_rht *t); 688 void ip_vs_rht_rcu_free(struct rcu_head *head); 689 struct ip_vs_rht *ip_vs_rht_alloc(int buckets, int scounts, int locks); 690 int ip_vs_rht_desired_size(struct netns_ipvs *ipvs, struct ip_vs_rht *t, int n, 691 int lfactor, int min_bits, int max_bits); 692 void ip_vs_rht_set_thresholds(struct ip_vs_rht *t, int size, int lfactor, 693 int min_bits, int max_bits); 694 u32 ip_vs_rht_hash_linfo(struct ip_vs_rht *t, int af, 695 const union nf_inet_addr *addr, u32 v1, u32 v2); 696 697 struct dst_entry; 698 struct iphdr; 699 struct ip_vs_conn; 700 struct ip_vs_app; 701 struct sk_buff; 702 struct ip_vs_proto_data; 703 704 struct ip_vs_protocol { 705 struct ip_vs_protocol *next; 706 char *name; 707 u16 protocol; 708 u16 num_states; 709 int dont_defrag; 710 711 void (*init)(struct ip_vs_protocol *pp); 712 713 void (*exit)(struct ip_vs_protocol *pp); 714 715 int (*init_netns)(struct netns_ipvs *ipvs, struct ip_vs_proto_data *pd); 716 717 void (*exit_netns)(struct netns_ipvs *ipvs, struct ip_vs_proto_data *pd); 718 719 int (*conn_schedule)(struct netns_ipvs *ipvs, 720 int af, struct sk_buff *skb, 721 struct ip_vs_proto_data *pd, 722 int *verdict, struct ip_vs_conn **cpp, 723 struct ip_vs_iphdr *iph); 724 725 struct ip_vs_conn * 726 (*conn_in_get)(struct netns_ipvs *ipvs, 727 int af, 728 const struct sk_buff *skb, 729 const struct ip_vs_iphdr *iph); 730 731 struct ip_vs_conn * 732 (*conn_out_get)(struct netns_ipvs *ipvs, 733 int af, 734 const struct sk_buff *skb, 735 const struct ip_vs_iphdr *iph); 736 737 int (*snat_handler)(struct sk_buff *skb, struct ip_vs_protocol *pp, 738 struct ip_vs_conn *cp, struct ip_vs_iphdr *iph); 739 740 int (*dnat_handler)(struct sk_buff *skb, struct ip_vs_protocol *pp, 741 struct ip_vs_conn *cp, struct ip_vs_iphdr *iph); 742 743 const char *(*state_name)(int state); 744 745 void (*state_transition)(struct ip_vs_conn *cp, int direction, 746 const struct sk_buff *skb, 747 struct ip_vs_proto_data *pd); 748 749 int (*register_app)(struct netns_ipvs *ipvs, struct ip_vs_app *inc); 750 751 void (*unregister_app)(struct netns_ipvs *ipvs, struct ip_vs_app *inc); 752 753 int (*app_conn_bind)(struct ip_vs_conn *cp); 754 755 void (*debug_packet)(int af, struct ip_vs_protocol *pp, 756 const struct sk_buff *skb, 757 int offset, 758 const char *msg); 759 760 void (*timeout_change)(struct ip_vs_proto_data *pd, int flags); 761 }; 762 763 /* protocol data per netns */ 764 struct ip_vs_proto_data { 765 struct ip_vs_proto_data *next; 766 struct ip_vs_protocol *pp; 767 int *timeout_table; /* protocol timeout table */ 768 atomic_t appcnt; /* counter of proto app incs. */ 769 struct tcp_states_t *tcp_state_table; 770 }; 771 772 struct ip_vs_protocol *ip_vs_proto_get(unsigned short proto); 773 struct ip_vs_proto_data *ip_vs_proto_data_get(struct netns_ipvs *ipvs, 774 unsigned short proto); 775 776 struct ip_vs_conn_param { 777 struct netns_ipvs *ipvs; 778 const union nf_inet_addr *caddr; 779 const union nf_inet_addr *vaddr; 780 __be16 cport; 781 __be16 vport; 782 __u16 protocol; 783 u16 af; 784 785 const struct ip_vs_pe *pe; 786 char *pe_data; 787 __u8 pe_data_len; 788 }; 789 790 /* Hash node in conn_tab */ 791 struct ip_vs_conn_hnode { 792 struct hlist_bl_node node; /* node in conn_tab */ 793 u32 hash_key; /* Key for the hash table */ 794 u8 dir; /* 0=out->in, 1=in->out */ 795 } __packed; 796 797 /* IP_VS structure allocated for each dynamically scheduled connection */ 798 struct ip_vs_conn { 799 /* Cacheline for hash table nodes - rarely modified */ 800 801 struct ip_vs_conn_hnode hn0; /* Original direction */ 802 u8 af; /* address family */ 803 __be16 cport; 804 struct ip_vs_conn_hnode hn1; /* Reply direction */ 805 u8 daf; /* Address family of the dest */ 806 __be16 dport; 807 struct ip_vs_dest *dest; /* real server */ 808 atomic_t n_control; /* Number of controlled ones */ 809 volatile __u32 flags; /* status flags */ 810 /* 44/64 */ 811 812 struct ip_vs_conn *control; /* Master control connection */ 813 const struct ip_vs_pe *pe; 814 char *pe_data; 815 __u8 pe_data_len; 816 volatile __u16 state; /* state info */ 817 volatile __u16 old_state; /* old state, to be used for 818 * state transition triggered 819 * synchronization 820 */ 821 /* 2-byte hole */ 822 /* 64/96 */ 823 824 union nf_inet_addr caddr; /* client address */ 825 union nf_inet_addr vaddr; /* virtual address */ 826 /* 96/128 */ 827 828 union nf_inet_addr daddr; /* destination address */ 829 __u32 fwmark; /* Fire wall mark from skb */ 830 __be16 vport; 831 __u16 protocol; /* Which protocol (TCP/UDP) */ 832 833 /* Note: we can group the following members into a structure, 834 * in order to save more space, and the following members are 835 * only used in VS/NAT anyway 836 */ 837 struct ip_vs_app *app; /* bound ip_vs_app object */ 838 void *app_data; /* Application private data */ 839 /* 128/168 */ 840 struct_group(sync_conn_opt, 841 struct ip_vs_seq in_seq; /* incoming seq. struct */ 842 struct ip_vs_seq out_seq; /* outgoing seq. struct */ 843 ); 844 /* 152/192 */ 845 846 struct timer_list timer; /* Expiration timer */ 847 volatile unsigned long timeout; /* timeout */ 848 spinlock_t lock; /* lock for state transition */ 849 refcount_t refcnt; /* reference count */ 850 atomic_t in_pkts; /* incoming packet counter */ 851 /* 64-bit: 4-byte gap */ 852 853 /* 188/256 */ 854 unsigned long sync_endtime; /* jiffies + sent_retries */ 855 struct netns_ipvs *ipvs; 856 857 /* Packet transmitter for different forwarding methods. If it 858 * mangles the packet, it must return NF_DROP or better NF_STOLEN, 859 * otherwise this must be changed to a sk_buff **. 860 * NF_ACCEPT can be returned when destination is local. 861 */ 862 int (*packet_xmit)(struct sk_buff *skb, struct ip_vs_conn *cp, 863 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph); 864 865 struct rcu_head rcu_head; 866 }; 867 868 /* Extended internal versions of struct ip_vs_service_user and ip_vs_dest_user 869 * for IPv6 support. 870 * 871 * We need these to conveniently pass around service and destination 872 * options, but unfortunately, we also need to keep the old definitions to 873 * maintain userspace backwards compatibility for the setsockopt interface. 874 */ 875 struct ip_vs_service_user_kern { 876 /* virtual service addresses */ 877 u16 af; 878 u16 protocol; 879 union nf_inet_addr addr; /* virtual ip address */ 880 __be16 port; 881 u32 fwmark; /* firewall mark of service */ 882 883 /* virtual service options */ 884 char *sched_name; 885 char *pe_name; 886 unsigned int flags; /* virtual service flags */ 887 unsigned int timeout; /* persistent timeout in sec */ 888 __be32 netmask; /* persistent netmask or plen */ 889 }; 890 891 892 struct ip_vs_dest_user_kern { 893 /* destination server address */ 894 union nf_inet_addr addr; 895 __be16 port; 896 897 /* real server options */ 898 unsigned int conn_flags; /* connection flags */ 899 int weight; /* destination weight */ 900 901 /* thresholds for active connections */ 902 u32 u_threshold; /* upper threshold */ 903 u32 l_threshold; /* lower threshold */ 904 905 /* Address family of addr */ 906 u16 af; 907 908 u16 tun_type; /* tunnel type */ 909 __be16 tun_port; /* tunnel port */ 910 u16 tun_flags; /* tunnel flags */ 911 }; 912 913 914 /* 915 * The information about the virtual service offered to the net and the 916 * forwarding entries. 917 */ 918 struct ip_vs_service { 919 struct hlist_bl_node s_list; /* node in service table */ 920 u32 hash_key; /* Key for the hash table */ 921 u16 af; /* address family */ 922 __u16 protocol; /* which protocol (TCP/UDP) */ 923 924 union nf_inet_addr addr; /* IP address for virtual service */ 925 __u32 fwmark; /* firewall mark of the service */ 926 atomic_t refcnt; /* reference counter */ 927 __be16 port; /* port number for the service */ 928 unsigned int flags; /* service status flags */ 929 unsigned int timeout; /* persistent timeout in ticks */ 930 __be32 netmask; /* grouping granularity, mask/plen */ 931 struct netns_ipvs *ipvs; 932 933 struct list_head destinations; /* real server d-linked list */ 934 __u32 num_dests; /* number of servers */ 935 struct ip_vs_stats stats; /* statistics for the service */ 936 937 /* for scheduling */ 938 struct ip_vs_scheduler __rcu *scheduler; /* bound scheduler object */ 939 spinlock_t sched_lock; /* lock sched_data */ 940 void *sched_data; /* scheduler application data */ 941 942 /* alternate persistence engine */ 943 struct ip_vs_pe __rcu *pe; 944 int conntrack_afmask; 945 946 struct rcu_head rcu_head; 947 }; 948 949 /* Information for cached dst */ 950 struct ip_vs_dest_dst { 951 struct dst_entry *dst_cache; /* destination cache entry */ 952 u32 dst_cookie; 953 union nf_inet_addr dst_saddr; 954 struct rcu_head rcu_head; 955 }; 956 957 /* The real server destination forwarding entry with ip address, port number, 958 * and so on. 959 */ 960 struct ip_vs_dest { 961 struct list_head n_list; /* for the dests in the service */ 962 struct hlist_node d_list; /* for table with all the dests */ 963 964 u16 af; /* address family */ 965 __be16 port; /* port number of the server */ 966 union nf_inet_addr addr; /* IP address of the server */ 967 volatile unsigned int flags; /* dest status flags */ 968 atomic_t conn_flags; /* flags to copy to conn */ 969 atomic_t weight; /* server weight */ 970 atomic_t last_weight; /* server latest weight */ 971 __u16 tun_type; /* tunnel type */ 972 __be16 tun_port; /* tunnel port */ 973 __u16 tun_flags; /* tunnel flags */ 974 975 refcount_t refcnt; /* reference counter */ 976 struct ip_vs_stats stats; /* statistics */ 977 unsigned long idle_start; /* start time, jiffies */ 978 979 /* connection counters and thresholds */ 980 atomic_t activeconns; /* active connections */ 981 atomic_t inactconns; /* inactive connections */ 982 atomic_t persistconns; /* persistent connections */ 983 __u32 u_threshold; /* upper threshold */ 984 __u32 l_threshold; /* lower threshold */ 985 986 /* for destination cache */ 987 spinlock_t dst_lock; /* lock of dst_cache */ 988 struct ip_vs_dest_dst __rcu *dest_dst; /* cached dst info */ 989 990 /* for virtual service */ 991 struct ip_vs_service __rcu *svc; /* service it belongs to */ 992 __u16 protocol; /* which protocol (TCP/UDP) */ 993 __be16 vport; /* virtual port number */ 994 union nf_inet_addr vaddr; /* virtual IP address */ 995 __u32 vfwmark; /* firewall mark of service */ 996 997 struct rcu_head rcu_head; 998 struct list_head t_list; /* in dest_trash */ 999 unsigned int in_rs_table:1; /* we are in rs_table */ 1000 }; 1001 1002 /* The scheduler object */ 1003 struct ip_vs_scheduler { 1004 struct list_head n_list; /* d-linked list head */ 1005 char *name; /* scheduler name */ 1006 atomic_t refcnt; /* reference counter */ 1007 struct module *module; /* THIS_MODULE/NULL */ 1008 1009 /* scheduler initializing service */ 1010 int (*init_service)(struct ip_vs_service *svc); 1011 /* scheduling service finish */ 1012 void (*done_service)(struct ip_vs_service *svc); 1013 /* dest is linked */ 1014 int (*add_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest); 1015 /* dest is unlinked */ 1016 int (*del_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest); 1017 /* dest is updated */ 1018 int (*upd_dest)(struct ip_vs_service *svc, struct ip_vs_dest *dest); 1019 1020 /* selecting a server from the given service */ 1021 struct ip_vs_dest* (*schedule)(struct ip_vs_service *svc, 1022 const struct sk_buff *skb, 1023 struct ip_vs_iphdr *iph); 1024 }; 1025 1026 /* The persistence engine object */ 1027 struct ip_vs_pe { 1028 struct list_head n_list; /* d-linked list head */ 1029 char *name; /* scheduler name */ 1030 atomic_t refcnt; /* reference counter */ 1031 struct module *module; /* THIS_MODULE/NULL */ 1032 1033 /* get the connection template, if any */ 1034 int (*fill_param)(struct ip_vs_conn_param *p, struct sk_buff *skb); 1035 bool (*ct_match)(const struct ip_vs_conn_param *p, 1036 struct ip_vs_conn *ct); 1037 u32 (*hashkey_raw)(const struct ip_vs_conn_param *p, 1038 struct ip_vs_rht *t, bool inverse); 1039 int (*show_pe_data)(const struct ip_vs_conn *cp, char *buf); 1040 /* create connections for real-server outgoing packets */ 1041 struct ip_vs_conn* (*conn_out)(struct ip_vs_service *svc, 1042 struct ip_vs_dest *dest, 1043 struct sk_buff *skb, 1044 const struct ip_vs_iphdr *iph, 1045 __be16 dport, __be16 cport); 1046 }; 1047 1048 /* The application module object (a.k.a. app incarnation) */ 1049 struct ip_vs_app { 1050 struct list_head a_list; /* member in app list */ 1051 int type; /* IP_VS_APP_TYPE_xxx */ 1052 char *name; /* application module name */ 1053 __u16 protocol; 1054 struct module *module; /* THIS_MODULE/NULL */ 1055 struct list_head incs_list; /* list of incarnations */ 1056 1057 /* members for application incarnations */ 1058 struct list_head p_list; /* member in proto app list */ 1059 struct ip_vs_app *app; /* its real application */ 1060 __be16 port; /* port number in net order */ 1061 atomic_t usecnt; /* usage counter */ 1062 struct rcu_head rcu_head; 1063 1064 /* output hook: Process packet in inout direction, diff set for TCP. 1065 * Return: 0=Error, 1=Payload Not Mangled/Mangled but checksum is ok, 1066 * 2=Mangled but checksum was not updated 1067 */ 1068 int (*pkt_out)(struct ip_vs_app *, struct ip_vs_conn *, 1069 struct sk_buff *, int *diff, struct ip_vs_iphdr *ipvsh); 1070 1071 /* input hook: Process packet in outin direction, diff set for TCP. 1072 * Return: 0=Error, 1=Payload Not Mangled/Mangled but checksum is ok, 1073 * 2=Mangled but checksum was not updated 1074 */ 1075 int (*pkt_in)(struct ip_vs_app *, struct ip_vs_conn *, 1076 struct sk_buff *, int *diff, struct ip_vs_iphdr *ipvsh); 1077 1078 /* ip_vs_app initializer */ 1079 int (*init_conn)(struct ip_vs_app *, struct ip_vs_conn *); 1080 1081 /* ip_vs_app finish */ 1082 int (*done_conn)(struct ip_vs_app *, struct ip_vs_conn *); 1083 1084 1085 /* not used now */ 1086 int (*bind_conn)(struct ip_vs_app *, struct ip_vs_conn *, 1087 struct ip_vs_protocol *); 1088 1089 void (*unbind_conn)(struct ip_vs_app *, struct ip_vs_conn *); 1090 1091 int * timeout_table; 1092 int * timeouts; 1093 int timeouts_size; 1094 1095 int (*conn_schedule)(struct sk_buff *skb, struct ip_vs_app *app, 1096 int *verdict, struct ip_vs_conn **cpp); 1097 1098 struct ip_vs_conn * 1099 (*conn_in_get)(const struct sk_buff *skb, struct ip_vs_app *app, 1100 const struct iphdr *iph, int inverse); 1101 1102 struct ip_vs_conn * 1103 (*conn_out_get)(const struct sk_buff *skb, struct ip_vs_app *app, 1104 const struct iphdr *iph, int inverse); 1105 1106 int (*state_transition)(struct ip_vs_conn *cp, int direction, 1107 const struct sk_buff *skb, 1108 struct ip_vs_app *app); 1109 1110 void (*timeout_change)(struct ip_vs_app *app, int flags); 1111 }; 1112 1113 struct ipvs_master_sync_state { 1114 struct list_head sync_queue; 1115 struct ip_vs_sync_buff *sync_buff; 1116 unsigned long sync_queue_len; 1117 unsigned int sync_queue_delay; 1118 struct delayed_work master_wakeup_work; 1119 struct netns_ipvs *ipvs; 1120 }; 1121 1122 struct ip_vs_sync_thread_data; 1123 1124 /* How much time to keep dests in trash */ 1125 #define IP_VS_DEST_TRASH_PERIOD (120 * HZ) 1126 1127 struct ipvs_sync_daemon_cfg { 1128 union nf_inet_addr mcast_group; 1129 int syncid; 1130 u16 sync_maxlen; 1131 u16 mcast_port; 1132 u8 mcast_af; 1133 u8 mcast_ttl; 1134 /* multicast interface name */ 1135 char mcast_ifn[IP_VS_IFNAME_MAXLEN]; 1136 }; 1137 1138 /* IPVS in network namespace */ 1139 struct netns_ipvs { 1140 int gen; /* Generation */ 1141 int enable; /* enable like nf_hooks do */ 1142 /* Hash table: for real service lookups */ 1143 #define IP_VS_RTAB_BITS 4 1144 #define IP_VS_RTAB_SIZE (1 << IP_VS_RTAB_BITS) 1145 #define IP_VS_RTAB_MASK (IP_VS_RTAB_SIZE - 1) 1146 1147 struct hlist_head rs_table[IP_VS_RTAB_SIZE]; 1148 /* ip_vs_app */ 1149 struct list_head app_list; 1150 /* ip_vs_proto */ 1151 #define IP_VS_PROTO_TAB_SIZE 32 /* must be power of 2 */ 1152 struct ip_vs_proto_data *proto_data_table[IP_VS_PROTO_TAB_SIZE]; 1153 /* ip_vs_proto_tcp */ 1154 #ifdef CONFIG_IP_VS_PROTO_TCP 1155 #define TCP_APP_TAB_BITS 4 1156 #define TCP_APP_TAB_SIZE (1 << TCP_APP_TAB_BITS) 1157 #define TCP_APP_TAB_MASK (TCP_APP_TAB_SIZE - 1) 1158 struct list_head tcp_apps[TCP_APP_TAB_SIZE]; 1159 #endif 1160 /* ip_vs_proto_udp */ 1161 #ifdef CONFIG_IP_VS_PROTO_UDP 1162 #define UDP_APP_TAB_BITS 4 1163 #define UDP_APP_TAB_SIZE (1 << UDP_APP_TAB_BITS) 1164 #define UDP_APP_TAB_MASK (UDP_APP_TAB_SIZE - 1) 1165 struct list_head udp_apps[UDP_APP_TAB_SIZE]; 1166 #endif 1167 /* ip_vs_proto_sctp */ 1168 #ifdef CONFIG_IP_VS_PROTO_SCTP 1169 #define SCTP_APP_TAB_BITS 4 1170 #define SCTP_APP_TAB_SIZE (1 << SCTP_APP_TAB_BITS) 1171 #define SCTP_APP_TAB_MASK (SCTP_APP_TAB_SIZE - 1) 1172 /* Hash table for SCTP application incarnations */ 1173 struct list_head sctp_apps[SCTP_APP_TAB_SIZE]; 1174 #endif 1175 /* ip_vs_conn */ 1176 atomic_t conn_count; /* connection counter */ 1177 atomic_t no_cport_conns[IP_VS_AF_MAX]; 1178 struct delayed_work conn_resize_work;/* resize conn_tab */ 1179 1180 /* ip_vs_ctl */ 1181 struct ip_vs_stats_rcu *tot_stats; /* Statistics & est. */ 1182 1183 /* Trash for destinations */ 1184 struct list_head dest_trash; 1185 spinlock_t dest_trash_lock; 1186 struct timer_list dest_trash_timer; /* expiration timer */ 1187 struct mutex service_mutex; /* service reconfig */ 1188 struct rw_semaphore svc_resize_sem; /* svc_table resizing */ 1189 struct delayed_work svc_resize_work; /* resize svc_table */ 1190 atomic_t svc_table_changes;/* ++ on new table */ 1191 /* Service counters */ 1192 atomic_t num_services[IP_VS_AF_MAX]; /* Services */ 1193 atomic_t fwm_services[IP_VS_AF_MAX]; /* Services */ 1194 atomic_t nonfwm_services[IP_VS_AF_MAX];/* Services */ 1195 atomic_t ftpsvc_counter[IP_VS_AF_MAX]; /* FTPPORT */ 1196 atomic_t nullsvc_counter[IP_VS_AF_MAX];/* Zero port */ 1197 atomic_t conn_out_counter[IP_VS_AF_MAX];/* out conn */ 1198 1199 #ifdef CONFIG_SYSCTL 1200 /* delayed work for expiring no dest connections */ 1201 struct delayed_work expire_nodest_conn_work; 1202 /* 1/rate drop and drop-entry variables */ 1203 struct delayed_work defense_work; /* Work handler */ 1204 int drop_rate; 1205 int drop_counter; 1206 int old_secure_tcp; 1207 atomic_t dropentry; 1208 s8 dropentry_counters[8]; 1209 /* locks in ctl.c */ 1210 spinlock_t dropentry_lock; /* drop entry handling */ 1211 spinlock_t droppacket_lock; /* drop packet handling */ 1212 spinlock_t securetcp_lock; /* state and timeout tables */ 1213 1214 /* sys-ctl struct */ 1215 struct ctl_table_header *sysctl_hdr; 1216 struct ctl_table *sysctl_tbl; 1217 #endif 1218 1219 /* sysctl variables */ 1220 int sysctl_amemthresh; 1221 int sysctl_am_droprate; 1222 int sysctl_drop_entry; 1223 int sysctl_drop_packet; 1224 int sysctl_secure_tcp; 1225 #ifdef CONFIG_IP_VS_NFCT 1226 int sysctl_conntrack; 1227 #endif 1228 int sysctl_snat_reroute; 1229 int sysctl_sync_ver; 1230 int sysctl_sync_ports; 1231 int sysctl_sync_persist_mode; 1232 unsigned long sysctl_sync_qlen_max; 1233 int sysctl_sync_sock_size; 1234 int sysctl_cache_bypass; 1235 int sysctl_expire_nodest_conn; 1236 int sysctl_sloppy_tcp; 1237 int sysctl_sloppy_sctp; 1238 int sysctl_expire_quiescent_template; 1239 int sysctl_sync_threshold[2]; 1240 unsigned int sysctl_sync_refresh_period; 1241 int sysctl_sync_retries; 1242 int sysctl_nat_icmp_send; 1243 int sysctl_pmtu_disc; 1244 int sysctl_backup_only; 1245 int sysctl_conn_reuse_mode; 1246 int sysctl_schedule_icmp; 1247 int sysctl_ignore_tunneled; 1248 int sysctl_run_estimation; 1249 #ifdef CONFIG_SYSCTL 1250 cpumask_var_t sysctl_est_cpulist; /* kthread cpumask */ 1251 int est_cpulist_valid; /* cpulist set */ 1252 int sysctl_est_nice; /* kthread nice */ 1253 int est_stopped; /* stop tasks */ 1254 #endif 1255 int sysctl_conn_lfactor; 1256 int sysctl_svc_lfactor; 1257 1258 /* ip_vs_lblc */ 1259 int sysctl_lblc_expiration; 1260 struct ctl_table_header *lblc_ctl_header; 1261 struct ctl_table *lblc_ctl_table; 1262 /* ip_vs_lblcr */ 1263 int sysctl_lblcr_expiration; 1264 struct ctl_table_header *lblcr_ctl_header; 1265 struct ctl_table *lblcr_ctl_table; 1266 unsigned long work_flags; /* IP_VS_WORK_* flags */ 1267 /* ip_vs_est */ 1268 struct delayed_work est_reload_work;/* Reload kthread tasks */ 1269 struct mutex est_mutex; /* protect kthread tasks */ 1270 struct hlist_head est_temp_list; /* Ests during calc phase */ 1271 struct ip_vs_est_kt_data **est_kt_arr; /* Array of kthread data ptrs */ 1272 unsigned long est_max_threads;/* Hard limit of kthreads */ 1273 int est_calc_phase; /* Calculation phase */ 1274 int est_chain_max; /* Calculated chain_max */ 1275 int est_kt_count; /* Allocated ptrs */ 1276 int est_add_ktid; /* ktid where to add ests */ 1277 atomic_t est_genid; /* kthreads reload genid */ 1278 atomic_t est_genid_done; /* applied genid */ 1279 /* ip_vs_sync */ 1280 spinlock_t sync_lock; 1281 struct ipvs_master_sync_state *ms; 1282 spinlock_t sync_buff_lock; 1283 struct ip_vs_sync_thread_data *master_tinfo; 1284 struct ip_vs_sync_thread_data *backup_tinfo; 1285 int threads_mask; 1286 volatile int sync_state; 1287 struct mutex sync_mutex; 1288 struct ipvs_sync_daemon_cfg mcfg; /* Master Configuration */ 1289 struct ipvs_sync_daemon_cfg bcfg; /* Backup Configuration */ 1290 /* net name space ptr */ 1291 struct net *net; /* Needed by timer routines */ 1292 /* Number of heterogeneous destinations, needed because heterogeneous 1293 * are not supported when synchronization is enabled. 1294 */ 1295 unsigned int mixed_address_family_dests; 1296 unsigned int hooks_afmask; /* &1=AF_INET, &2=AF_INET6 */ 1297 1298 struct ip_vs_rht __rcu *svc_table; /* Services */ 1299 struct ip_vs_rht __rcu *conn_tab; /* Connections */ 1300 atomic_t conn_tab_changes;/* ++ on new table */ 1301 }; 1302 1303 #define DEFAULT_SYNC_THRESHOLD 3 1304 #define DEFAULT_SYNC_PERIOD 50 1305 #define DEFAULT_SYNC_VER 1 1306 #define DEFAULT_SLOPPY_TCP 0 1307 #define DEFAULT_SLOPPY_SCTP 0 1308 #define DEFAULT_SYNC_REFRESH_PERIOD (0U * HZ) 1309 #define DEFAULT_SYNC_RETRIES 0 1310 #define IPVS_SYNC_WAKEUP_RATE 8 1311 #define IPVS_SYNC_QLEN_MAX (IPVS_SYNC_WAKEUP_RATE * 4) 1312 #define IPVS_SYNC_SEND_DELAY (HZ / 50) 1313 #define IPVS_SYNC_CHECK_PERIOD HZ 1314 #define IPVS_SYNC_FLUSH_TIME (HZ * 2) 1315 #define IPVS_SYNC_PORTS_MAX (1 << 6) 1316 1317 #ifdef CONFIG_SYSCTL 1318 1319 static inline int sysctl_sync_threshold(struct netns_ipvs *ipvs) 1320 { 1321 return ipvs->sysctl_sync_threshold[0]; 1322 } 1323 1324 static inline int sysctl_sync_period(struct netns_ipvs *ipvs) 1325 { 1326 return READ_ONCE(ipvs->sysctl_sync_threshold[1]); 1327 } 1328 1329 static inline unsigned int sysctl_sync_refresh_period(struct netns_ipvs *ipvs) 1330 { 1331 return READ_ONCE(ipvs->sysctl_sync_refresh_period); 1332 } 1333 1334 static inline int sysctl_sync_retries(struct netns_ipvs *ipvs) 1335 { 1336 return ipvs->sysctl_sync_retries; 1337 } 1338 1339 static inline int sysctl_sync_ver(struct netns_ipvs *ipvs) 1340 { 1341 return ipvs->sysctl_sync_ver; 1342 } 1343 1344 static inline int sysctl_sloppy_tcp(struct netns_ipvs *ipvs) 1345 { 1346 return ipvs->sysctl_sloppy_tcp; 1347 } 1348 1349 static inline int sysctl_sloppy_sctp(struct netns_ipvs *ipvs) 1350 { 1351 return ipvs->sysctl_sloppy_sctp; 1352 } 1353 1354 static inline int sysctl_sync_ports(struct netns_ipvs *ipvs) 1355 { 1356 return READ_ONCE(ipvs->sysctl_sync_ports); 1357 } 1358 1359 static inline int sysctl_sync_persist_mode(struct netns_ipvs *ipvs) 1360 { 1361 return ipvs->sysctl_sync_persist_mode; 1362 } 1363 1364 static inline unsigned long sysctl_sync_qlen_max(struct netns_ipvs *ipvs) 1365 { 1366 return ipvs->sysctl_sync_qlen_max; 1367 } 1368 1369 static inline int sysctl_sync_sock_size(struct netns_ipvs *ipvs) 1370 { 1371 return ipvs->sysctl_sync_sock_size; 1372 } 1373 1374 static inline int sysctl_pmtu_disc(struct netns_ipvs *ipvs) 1375 { 1376 return ipvs->sysctl_pmtu_disc; 1377 } 1378 1379 static inline int sysctl_backup_only(struct netns_ipvs *ipvs) 1380 { 1381 return ipvs->sync_state & IP_VS_STATE_BACKUP && 1382 ipvs->sysctl_backup_only; 1383 } 1384 1385 static inline int sysctl_conn_reuse_mode(struct netns_ipvs *ipvs) 1386 { 1387 return ipvs->sysctl_conn_reuse_mode; 1388 } 1389 1390 static inline int sysctl_expire_nodest_conn(struct netns_ipvs *ipvs) 1391 { 1392 return ipvs->sysctl_expire_nodest_conn; 1393 } 1394 1395 static inline int sysctl_schedule_icmp(struct netns_ipvs *ipvs) 1396 { 1397 return ipvs->sysctl_schedule_icmp; 1398 } 1399 1400 static inline int sysctl_ignore_tunneled(struct netns_ipvs *ipvs) 1401 { 1402 return ipvs->sysctl_ignore_tunneled; 1403 } 1404 1405 static inline int sysctl_cache_bypass(struct netns_ipvs *ipvs) 1406 { 1407 return ipvs->sysctl_cache_bypass; 1408 } 1409 1410 static inline int sysctl_run_estimation(struct netns_ipvs *ipvs) 1411 { 1412 return ipvs->sysctl_run_estimation; 1413 } 1414 1415 static inline const struct cpumask *__sysctl_est_cpulist(struct netns_ipvs *ipvs) 1416 { 1417 if (ipvs->est_cpulist_valid) 1418 return ipvs->sysctl_est_cpulist; 1419 else 1420 return housekeeping_cpumask(HK_TYPE_KTHREAD); 1421 } 1422 1423 static inline const struct cpumask *sysctl_est_preferred_cpulist(struct netns_ipvs *ipvs) 1424 { 1425 if (ipvs->est_cpulist_valid) 1426 return ipvs->sysctl_est_cpulist; 1427 else 1428 return NULL; 1429 } 1430 1431 static inline int sysctl_est_nice(struct netns_ipvs *ipvs) 1432 { 1433 return ipvs->sysctl_est_nice; 1434 } 1435 1436 #else 1437 1438 static inline int sysctl_sync_threshold(struct netns_ipvs *ipvs) 1439 { 1440 return DEFAULT_SYNC_THRESHOLD; 1441 } 1442 1443 static inline int sysctl_sync_period(struct netns_ipvs *ipvs) 1444 { 1445 return DEFAULT_SYNC_PERIOD; 1446 } 1447 1448 static inline unsigned int sysctl_sync_refresh_period(struct netns_ipvs *ipvs) 1449 { 1450 return DEFAULT_SYNC_REFRESH_PERIOD; 1451 } 1452 1453 static inline int sysctl_sync_retries(struct netns_ipvs *ipvs) 1454 { 1455 return DEFAULT_SYNC_RETRIES & 3; 1456 } 1457 1458 static inline int sysctl_sync_ver(struct netns_ipvs *ipvs) 1459 { 1460 return DEFAULT_SYNC_VER; 1461 } 1462 1463 static inline int sysctl_sloppy_tcp(struct netns_ipvs *ipvs) 1464 { 1465 return DEFAULT_SLOPPY_TCP; 1466 } 1467 1468 static inline int sysctl_sloppy_sctp(struct netns_ipvs *ipvs) 1469 { 1470 return DEFAULT_SLOPPY_SCTP; 1471 } 1472 1473 static inline int sysctl_sync_ports(struct netns_ipvs *ipvs) 1474 { 1475 return 1; 1476 } 1477 1478 static inline int sysctl_sync_persist_mode(struct netns_ipvs *ipvs) 1479 { 1480 return 0; 1481 } 1482 1483 static inline unsigned long sysctl_sync_qlen_max(struct netns_ipvs *ipvs) 1484 { 1485 return IPVS_SYNC_QLEN_MAX; 1486 } 1487 1488 static inline int sysctl_sync_sock_size(struct netns_ipvs *ipvs) 1489 { 1490 return 0; 1491 } 1492 1493 static inline int sysctl_pmtu_disc(struct netns_ipvs *ipvs) 1494 { 1495 return 1; 1496 } 1497 1498 static inline int sysctl_backup_only(struct netns_ipvs *ipvs) 1499 { 1500 return 0; 1501 } 1502 1503 static inline int sysctl_conn_reuse_mode(struct netns_ipvs *ipvs) 1504 { 1505 return 1; 1506 } 1507 1508 static inline int sysctl_expire_nodest_conn(struct netns_ipvs *ipvs) 1509 { 1510 return 0; 1511 } 1512 1513 static inline int sysctl_schedule_icmp(struct netns_ipvs *ipvs) 1514 { 1515 return 0; 1516 } 1517 1518 static inline int sysctl_ignore_tunneled(struct netns_ipvs *ipvs) 1519 { 1520 return 0; 1521 } 1522 1523 static inline int sysctl_cache_bypass(struct netns_ipvs *ipvs) 1524 { 1525 return 0; 1526 } 1527 1528 static inline int sysctl_run_estimation(struct netns_ipvs *ipvs) 1529 { 1530 return 1; 1531 } 1532 1533 static inline const struct cpumask *__sysctl_est_cpulist(struct netns_ipvs *ipvs) 1534 { 1535 return housekeeping_cpumask(HK_TYPE_KTHREAD); 1536 } 1537 1538 static inline const struct cpumask *sysctl_est_preferred_cpulist(struct netns_ipvs *ipvs) 1539 { 1540 return NULL; 1541 } 1542 1543 static inline int sysctl_est_nice(struct netns_ipvs *ipvs) 1544 { 1545 return IPVS_EST_NICE; 1546 } 1547 1548 #endif 1549 1550 /* Get load factor to map conn_count/u_thresh to t->size */ 1551 static inline int sysctl_conn_lfactor(struct netns_ipvs *ipvs) 1552 { 1553 return READ_ONCE(ipvs->sysctl_conn_lfactor); 1554 } 1555 1556 /* Get load factor to map num_services/u_thresh to t->size 1557 * Smaller value decreases u_thresh to reduce collisions but increases 1558 * the table size 1559 * Returns factor where: 1560 * - <0: u_thresh = size >> -factor, eg. lfactor -2 = 25% load 1561 * - >=0: u_thresh = size << factor, eg. lfactor 1 = 200% load 1562 */ 1563 static inline int sysctl_svc_lfactor(struct netns_ipvs *ipvs) 1564 { 1565 return READ_ONCE(ipvs->sysctl_svc_lfactor); 1566 } 1567 1568 static inline bool sysctl_est_cpulist_empty(struct netns_ipvs *ipvs) 1569 { 1570 guard(rcu)(); 1571 return cpumask_empty(__sysctl_est_cpulist(ipvs)); 1572 } 1573 1574 static inline unsigned int sysctl_est_cpulist_weight(struct netns_ipvs *ipvs) 1575 { 1576 guard(rcu)(); 1577 return cpumask_weight(__sysctl_est_cpulist(ipvs)); 1578 } 1579 1580 /* IPVS core functions 1581 * (from ip_vs_core.c) 1582 */ 1583 const char *ip_vs_proto_name(unsigned int proto); 1584 void ip_vs_init_hash_table(struct list_head *table, int rows); 1585 struct ip_vs_conn *ip_vs_new_conn_out(struct ip_vs_service *svc, 1586 struct ip_vs_dest *dest, 1587 struct sk_buff *skb, 1588 const struct ip_vs_iphdr *iph, 1589 __be16 dport, 1590 __be16 cport); 1591 #define IP_VS_INIT_HASH_TABLE(t) ip_vs_init_hash_table((t), ARRAY_SIZE((t))) 1592 1593 #define IP_VS_APP_TYPE_FTP 1 1594 1595 /* ip_vs_conn handling functions 1596 * (from ip_vs_conn.c) 1597 */ 1598 enum { 1599 IP_VS_DIR_INPUT = 0, 1600 IP_VS_DIR_OUTPUT, 1601 IP_VS_DIR_INPUT_ONLY, 1602 IP_VS_DIR_LAST, 1603 }; 1604 1605 static inline void ip_vs_conn_fill_param(struct netns_ipvs *ipvs, int af, int protocol, 1606 const union nf_inet_addr *caddr, 1607 __be16 cport, 1608 const union nf_inet_addr *vaddr, 1609 __be16 vport, 1610 struct ip_vs_conn_param *p) 1611 { 1612 p->ipvs = ipvs; 1613 p->af = af; 1614 p->protocol = protocol; 1615 p->caddr = caddr; 1616 p->cport = cport; 1617 p->vaddr = vaddr; 1618 p->vport = vport; 1619 p->pe = NULL; 1620 p->pe_data = NULL; 1621 } 1622 1623 struct ip_vs_conn *ip_vs_conn_in_get(const struct ip_vs_conn_param *p); 1624 struct ip_vs_conn *ip_vs_ct_in_get(const struct ip_vs_conn_param *p); 1625 1626 struct ip_vs_conn * ip_vs_conn_in_get_proto(struct netns_ipvs *ipvs, int af, 1627 const struct sk_buff *skb, 1628 const struct ip_vs_iphdr *iph); 1629 1630 struct ip_vs_conn *ip_vs_conn_out_get(const struct ip_vs_conn_param *p); 1631 1632 struct ip_vs_conn * ip_vs_conn_out_get_proto(struct netns_ipvs *ipvs, int af, 1633 const struct sk_buff *skb, 1634 const struct ip_vs_iphdr *iph); 1635 1636 /* Get reference to gain full access to conn. 1637 * By default, RCU read-side critical sections have access only to 1638 * conn fields and its PE data, see ip_vs_conn_rcu_free() for reference. 1639 */ 1640 static inline bool __ip_vs_conn_get(struct ip_vs_conn *cp) 1641 { 1642 return refcount_inc_not_zero(&cp->refcnt); 1643 } 1644 1645 /* put back the conn without restarting its timer */ 1646 static inline void __ip_vs_conn_put(struct ip_vs_conn *cp) 1647 { 1648 smp_mb__before_atomic(); 1649 refcount_dec(&cp->refcnt); 1650 } 1651 void ip_vs_conn_put(struct ip_vs_conn *cp); 1652 void ip_vs_conn_fill_cport(struct ip_vs_conn *cp, __be16 cport); 1653 int ip_vs_conn_desired_size(struct netns_ipvs *ipvs, struct ip_vs_rht *t, 1654 int lfactor); 1655 struct ip_vs_rht *ip_vs_conn_tab_alloc(struct netns_ipvs *ipvs, int buckets, 1656 int lfactor); 1657 1658 static inline struct ip_vs_conn * 1659 ip_vs_hn0_to_conn(struct ip_vs_conn_hnode *hn) 1660 { 1661 return container_of(hn, struct ip_vs_conn, hn0); 1662 } 1663 1664 static inline struct ip_vs_conn * 1665 ip_vs_hn_to_conn(struct ip_vs_conn_hnode *hn) 1666 { 1667 return hn->dir ? container_of(hn, struct ip_vs_conn, hn1) : 1668 container_of(hn, struct ip_vs_conn, hn0); 1669 } 1670 1671 struct ip_vs_conn *ip_vs_conn_new(const struct ip_vs_conn_param *p, int dest_af, 1672 const union nf_inet_addr *daddr, 1673 __be16 dport, unsigned int flags, 1674 struct ip_vs_dest *dest, __u32 fwmark); 1675 void ip_vs_conn_expire_now(struct ip_vs_conn *cp); 1676 1677 const char *ip_vs_state_name(const struct ip_vs_conn *cp); 1678 1679 void ip_vs_tcp_conn_listen(struct ip_vs_conn *cp); 1680 int ip_vs_check_template(struct ip_vs_conn *ct, struct ip_vs_dest *cdest); 1681 void ip_vs_random_dropentry(struct netns_ipvs *ipvs); 1682 int ip_vs_conn_init(void); 1683 void ip_vs_conn_cleanup(void); 1684 1685 static inline void ip_vs_control_del(struct ip_vs_conn *cp) 1686 { 1687 struct ip_vs_conn *ctl_cp = cp->control; 1688 if (!ctl_cp) { 1689 IP_VS_ERR_BUF("request control DEL for uncontrolled: " 1690 "%s:%d to %s:%d\n", 1691 IP_VS_DBG_ADDR(cp->af, &cp->caddr), 1692 ntohs(cp->cport), 1693 IP_VS_DBG_ADDR(cp->af, &cp->vaddr), 1694 ntohs(cp->vport)); 1695 1696 return; 1697 } 1698 1699 IP_VS_DBG_BUF(7, "DELeting control for: " 1700 "cp.dst=%s:%d ctl_cp.dst=%s:%d\n", 1701 IP_VS_DBG_ADDR(cp->af, &cp->caddr), 1702 ntohs(cp->cport), 1703 IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr), 1704 ntohs(ctl_cp->cport)); 1705 1706 cp->control = NULL; 1707 if (atomic_read(&ctl_cp->n_control) == 0) { 1708 IP_VS_ERR_BUF("BUG control DEL with n=0 : " 1709 "%s:%d to %s:%d\n", 1710 IP_VS_DBG_ADDR(cp->af, &cp->caddr), 1711 ntohs(cp->cport), 1712 IP_VS_DBG_ADDR(cp->af, &cp->vaddr), 1713 ntohs(cp->vport)); 1714 1715 return; 1716 } 1717 atomic_dec(&ctl_cp->n_control); 1718 } 1719 1720 static inline void 1721 ip_vs_control_add(struct ip_vs_conn *cp, struct ip_vs_conn *ctl_cp) 1722 { 1723 if (cp->control) { 1724 IP_VS_ERR_BUF("request control ADD for already controlled: " 1725 "%s:%d to %s:%d\n", 1726 IP_VS_DBG_ADDR(cp->af, &cp->caddr), 1727 ntohs(cp->cport), 1728 IP_VS_DBG_ADDR(cp->af, &cp->vaddr), 1729 ntohs(cp->vport)); 1730 1731 ip_vs_control_del(cp); 1732 } 1733 1734 IP_VS_DBG_BUF(7, "ADDing control for: " 1735 "cp.dst=%s:%d ctl_cp.dst=%s:%d\n", 1736 IP_VS_DBG_ADDR(cp->af, &cp->caddr), 1737 ntohs(cp->cport), 1738 IP_VS_DBG_ADDR(cp->af, &ctl_cp->caddr), 1739 ntohs(ctl_cp->cport)); 1740 1741 cp->control = ctl_cp; 1742 atomic_inc(&ctl_cp->n_control); 1743 } 1744 1745 /* Mark our template as assured */ 1746 static inline void 1747 ip_vs_control_assure_ct(struct ip_vs_conn *cp) 1748 { 1749 struct ip_vs_conn *ct = cp->control; 1750 1751 if (ct && !(ct->state & IP_VS_CTPL_S_ASSURED) && 1752 (ct->flags & IP_VS_CONN_F_TEMPLATE)) 1753 ct->state |= IP_VS_CTPL_S_ASSURED; 1754 } 1755 1756 /* IPVS netns init & cleanup functions */ 1757 int ip_vs_estimator_net_init(struct netns_ipvs *ipvs); 1758 int ip_vs_control_net_init(struct netns_ipvs *ipvs); 1759 int ip_vs_protocol_net_init(struct netns_ipvs *ipvs); 1760 int ip_vs_app_net_init(struct netns_ipvs *ipvs); 1761 int ip_vs_conn_net_init(struct netns_ipvs *ipvs); 1762 int ip_vs_sync_net_init(struct netns_ipvs *ipvs); 1763 void ip_vs_conn_net_cleanup(struct netns_ipvs *ipvs); 1764 void ip_vs_app_net_cleanup(struct netns_ipvs *ipvs); 1765 void ip_vs_protocol_net_cleanup(struct netns_ipvs *ipvs); 1766 void ip_vs_control_net_cleanup(struct netns_ipvs *ipvs); 1767 void ip_vs_estimator_net_cleanup(struct netns_ipvs *ipvs); 1768 void ip_vs_sync_net_cleanup(struct netns_ipvs *ipvs); 1769 void ip_vs_service_nets_cleanup(struct list_head *net_list); 1770 1771 /* IPVS application functions 1772 * (from ip_vs_app.c) 1773 */ 1774 #define IP_VS_APP_MAX_PORTS 8 1775 struct ip_vs_app *register_ip_vs_app(struct netns_ipvs *ipvs, struct ip_vs_app *app); 1776 void unregister_ip_vs_app(struct netns_ipvs *ipvs, struct ip_vs_app *app); 1777 int ip_vs_bind_app(struct ip_vs_conn *cp, struct ip_vs_protocol *pp); 1778 void ip_vs_unbind_app(struct ip_vs_conn *cp); 1779 int register_ip_vs_app_inc(struct netns_ipvs *ipvs, struct ip_vs_app *app, __u16 proto, 1780 __u16 port); 1781 int ip_vs_app_inc_get(struct ip_vs_app *inc); 1782 void ip_vs_app_inc_put(struct ip_vs_app *inc); 1783 1784 int ip_vs_app_pkt_out(struct ip_vs_conn *, struct sk_buff *skb, 1785 struct ip_vs_iphdr *ipvsh); 1786 int ip_vs_app_pkt_in(struct ip_vs_conn *, struct sk_buff *skb, 1787 struct ip_vs_iphdr *ipvsh); 1788 1789 int register_ip_vs_pe(struct ip_vs_pe *pe); 1790 int unregister_ip_vs_pe(struct ip_vs_pe *pe); 1791 struct ip_vs_pe *ip_vs_pe_getbyname(const char *name); 1792 struct ip_vs_pe *__ip_vs_pe_getbyname(const char *pe_name); 1793 1794 /* Use a #define to avoid all of module.h just for these trivial ops */ 1795 #define ip_vs_pe_get(pe) \ 1796 if (pe && pe->module) \ 1797 __module_get(pe->module); 1798 1799 #define ip_vs_pe_put(pe) \ 1800 if (pe && pe->module) \ 1801 module_put(pe->module); 1802 1803 /* IPVS protocol functions (from ip_vs_proto.c) */ 1804 int ip_vs_protocol_init(void); 1805 void ip_vs_protocol_cleanup(void); 1806 void ip_vs_protocol_timeout_change(struct netns_ipvs *ipvs, int flags); 1807 int *ip_vs_create_timeout_table(int *table, int size); 1808 void ip_vs_tcpudp_debug_packet(int af, struct ip_vs_protocol *pp, 1809 const struct sk_buff *skb, int offset, 1810 const char *msg); 1811 1812 extern struct ip_vs_protocol ip_vs_protocol_tcp; 1813 extern struct ip_vs_protocol ip_vs_protocol_udp; 1814 extern struct ip_vs_protocol ip_vs_protocol_icmp; 1815 extern struct ip_vs_protocol ip_vs_protocol_esp; 1816 extern struct ip_vs_protocol ip_vs_protocol_ah; 1817 extern struct ip_vs_protocol ip_vs_protocol_sctp; 1818 1819 /* Registering/unregistering scheduler functions 1820 * (from ip_vs_sched.c) 1821 */ 1822 int register_ip_vs_scheduler(struct ip_vs_scheduler *scheduler); 1823 int unregister_ip_vs_scheduler(struct ip_vs_scheduler *scheduler); 1824 int ip_vs_bind_scheduler(struct ip_vs_service *svc, 1825 struct ip_vs_scheduler *scheduler); 1826 void ip_vs_unbind_scheduler(struct ip_vs_service *svc, 1827 struct ip_vs_scheduler *sched); 1828 struct ip_vs_scheduler *ip_vs_scheduler_get(const char *sched_name); 1829 void ip_vs_scheduler_put(struct ip_vs_scheduler *scheduler); 1830 struct ip_vs_conn * 1831 ip_vs_schedule(struct ip_vs_service *svc, struct sk_buff *skb, 1832 struct ip_vs_proto_data *pd, int *ignored, 1833 struct ip_vs_iphdr *iph); 1834 int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb, 1835 struct ip_vs_proto_data *pd, struct ip_vs_iphdr *iph); 1836 1837 void ip_vs_scheduler_err(struct ip_vs_service *svc, const char *msg); 1838 1839 /* IPVS control data and functions (from ip_vs_ctl.c) */ 1840 extern struct ip_vs_stats ip_vs_stats; 1841 extern int sysctl_ip_vs_sync_ver; 1842 1843 struct ip_vs_service * 1844 ip_vs_service_find(struct netns_ipvs *ipvs, int af, __u32 fwmark, __u16 protocol, 1845 const union nf_inet_addr *vaddr, __be16 vport); 1846 1847 bool ip_vs_has_real_service(struct netns_ipvs *ipvs, int af, __u16 protocol, 1848 const union nf_inet_addr *daddr, __be16 dport); 1849 1850 struct ip_vs_dest * 1851 ip_vs_find_real_service(struct netns_ipvs *ipvs, int af, __u16 protocol, 1852 const union nf_inet_addr *daddr, __be16 dport); 1853 struct ip_vs_dest *ip_vs_find_tunnel(struct netns_ipvs *ipvs, int af, 1854 const union nf_inet_addr *daddr, 1855 __be16 tun_port); 1856 1857 int ip_vs_use_count_inc(void); 1858 void ip_vs_use_count_dec(void); 1859 int ip_vs_register_nl_ioctl(void); 1860 void ip_vs_unregister_nl_ioctl(void); 1861 int ip_vs_control_init(void); 1862 void ip_vs_control_cleanup(void); 1863 struct ip_vs_dest * 1864 ip_vs_find_dest(struct netns_ipvs *ipvs, int svc_af, int dest_af, 1865 const union nf_inet_addr *daddr, __be16 dport, 1866 const union nf_inet_addr *vaddr, __be16 vport, 1867 __u16 protocol, __u32 fwmark, __u32 flags); 1868 void ip_vs_try_bind_dest(struct ip_vs_conn *cp); 1869 1870 static inline void ip_vs_dest_hold(struct ip_vs_dest *dest) 1871 { 1872 refcount_inc(&dest->refcnt); 1873 } 1874 1875 static inline void ip_vs_dest_put(struct ip_vs_dest *dest) 1876 { 1877 smp_mb__before_atomic(); 1878 refcount_dec(&dest->refcnt); 1879 } 1880 1881 static inline void ip_vs_dest_put_and_free(struct ip_vs_dest *dest) 1882 { 1883 if (refcount_dec_and_test(&dest->refcnt)) 1884 kfree(dest); 1885 } 1886 1887 /* IPVS sync daemon data and function prototypes 1888 * (from ip_vs_sync.c) 1889 */ 1890 int start_sync_thread(struct netns_ipvs *ipvs, struct ipvs_sync_daemon_cfg *cfg, 1891 int state); 1892 int stop_sync_thread(struct netns_ipvs *ipvs, int state); 1893 void ip_vs_sync_conn(struct netns_ipvs *ipvs, struct ip_vs_conn *cp, int pkts); 1894 1895 /* IPVS rate estimator prototypes (from ip_vs_est.c) */ 1896 int ip_vs_start_estimator(struct netns_ipvs *ipvs, struct ip_vs_stats *stats); 1897 void ip_vs_stop_estimator(struct netns_ipvs *ipvs, struct ip_vs_stats *stats); 1898 void ip_vs_zero_estimator(struct ip_vs_stats *stats); 1899 void ip_vs_read_estimator(struct ip_vs_kstats *dst, struct ip_vs_stats *stats); 1900 void ip_vs_est_reload_start(struct netns_ipvs *ipvs, bool restart); 1901 int ip_vs_est_kthread_start(struct netns_ipvs *ipvs, 1902 struct ip_vs_est_kt_data *kd); 1903 void ip_vs_est_kthread_stop(struct ip_vs_est_kt_data *kd); 1904 1905 static inline void ip_vs_stop_estimator_tot_stats(struct netns_ipvs *ipvs) 1906 { 1907 #ifdef CONFIG_SYSCTL 1908 ip_vs_stop_estimator(ipvs, &ipvs->tot_stats->s); 1909 ipvs->tot_stats->s.est.ktid = -2; 1910 #endif 1911 } 1912 1913 static inline void ip_vs_est_stopped_recalc(struct netns_ipvs *ipvs) 1914 { 1915 #ifdef CONFIG_SYSCTL 1916 /* Stop tasks while cpulist is empty or if disabled with flag */ 1917 ipvs->est_stopped = !sysctl_run_estimation(ipvs) || 1918 (ipvs->est_cpulist_valid && 1919 sysctl_est_cpulist_empty(ipvs)); 1920 #endif 1921 } 1922 1923 static inline bool ip_vs_est_stopped(struct netns_ipvs *ipvs) 1924 { 1925 #ifdef CONFIG_SYSCTL 1926 return ipvs->est_stopped; 1927 #else 1928 return false; 1929 #endif 1930 } 1931 1932 static inline int ip_vs_est_max_threads(struct netns_ipvs *ipvs) 1933 { 1934 unsigned int limit = IPVS_EST_CPU_KTHREADS * 1935 sysctl_est_cpulist_weight(ipvs); 1936 1937 return max(1U, limit); 1938 } 1939 1940 /* Various IPVS packet transmitters (from ip_vs_xmit.c) */ 1941 int ip_vs_null_xmit(struct sk_buff *skb, struct ip_vs_conn *cp, 1942 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph); 1943 int ip_vs_bypass_xmit(struct sk_buff *skb, struct ip_vs_conn *cp, 1944 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph); 1945 int ip_vs_nat_xmit(struct sk_buff *skb, struct ip_vs_conn *cp, 1946 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph); 1947 int ip_vs_tunnel_xmit(struct sk_buff *skb, struct ip_vs_conn *cp, 1948 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph); 1949 int ip_vs_dr_xmit(struct sk_buff *skb, struct ip_vs_conn *cp, 1950 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph); 1951 int ip_vs_icmp_xmit(struct sk_buff *skb, struct ip_vs_conn *cp, 1952 struct ip_vs_protocol *pp, int offset, 1953 unsigned int hooknum, struct ip_vs_iphdr *iph); 1954 void ip_vs_dest_dst_rcu_free(struct rcu_head *head); 1955 1956 #ifdef CONFIG_IP_VS_IPV6 1957 int ip_vs_bypass_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp, 1958 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph); 1959 int ip_vs_nat_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp, 1960 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph); 1961 int ip_vs_tunnel_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp, 1962 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph); 1963 int ip_vs_dr_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp, 1964 struct ip_vs_protocol *pp, struct ip_vs_iphdr *iph); 1965 int ip_vs_icmp_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp, 1966 struct ip_vs_protocol *pp, int offset, 1967 unsigned int hooknum, struct ip_vs_iphdr *iph); 1968 #endif 1969 1970 #ifdef CONFIG_SYSCTL 1971 /* This is a simple mechanism to ignore packets when 1972 * we are loaded. Just set ip_vs_drop_rate to 'n' and 1973 * we start to drop 1/rate of the packets 1974 */ 1975 static inline int ip_vs_todrop(struct netns_ipvs *ipvs) 1976 { 1977 if (!ipvs->drop_rate) 1978 return 0; 1979 if (--ipvs->drop_counter > 0) 1980 return 0; 1981 ipvs->drop_counter = ipvs->drop_rate; 1982 return 1; 1983 } 1984 #else 1985 static inline int ip_vs_todrop(struct netns_ipvs *ipvs) { return 0; } 1986 #endif 1987 1988 #ifdef CONFIG_SYSCTL 1989 /* Enqueue delayed work for expiring no dest connections 1990 * Only run when sysctl_expire_nodest=1 1991 */ 1992 static inline void ip_vs_enqueue_expire_nodest_conns(struct netns_ipvs *ipvs) 1993 { 1994 if (sysctl_expire_nodest_conn(ipvs)) 1995 queue_delayed_work(system_long_wq, 1996 &ipvs->expire_nodest_conn_work, 1); 1997 } 1998 1999 void ip_vs_expire_nodest_conn_flush(struct netns_ipvs *ipvs); 2000 #else 2001 static inline void ip_vs_enqueue_expire_nodest_conns(struct netns_ipvs *ipvs) {} 2002 #endif 2003 2004 #define IP_VS_DFWD_METHOD(dest) (atomic_read(&(dest)->conn_flags) & \ 2005 IP_VS_CONN_F_FWD_MASK) 2006 2007 /* ip_vs_fwd_tag returns the forwarding tag of the connection */ 2008 #define IP_VS_FWD_METHOD(cp) (cp->flags & IP_VS_CONN_F_FWD_MASK) 2009 2010 static inline char ip_vs_fwd_tag(struct ip_vs_conn *cp) 2011 { 2012 char fwd; 2013 2014 switch (IP_VS_FWD_METHOD(cp)) { 2015 case IP_VS_CONN_F_MASQ: 2016 fwd = 'M'; break; 2017 case IP_VS_CONN_F_LOCALNODE: 2018 fwd = 'L'; break; 2019 case IP_VS_CONN_F_TUNNEL: 2020 fwd = 'T'; break; 2021 case IP_VS_CONN_F_DROUTE: 2022 fwd = 'R'; break; 2023 case IP_VS_CONN_F_BYPASS: 2024 fwd = 'B'; break; 2025 default: 2026 fwd = '?'; break; 2027 } 2028 return fwd; 2029 } 2030 2031 /* Check if connection uses double hashing */ 2032 static inline bool ip_vs_conn_use_hash2(struct ip_vs_conn *cp) 2033 { 2034 return IP_VS_FWD_METHOD(cp) == IP_VS_CONN_F_MASQ && 2035 !(cp->flags & IP_VS_CONN_F_TEMPLATE); 2036 } 2037 2038 void ip_vs_nat_icmp(struct sk_buff *skb, struct ip_vs_protocol *pp, 2039 struct ip_vs_conn *cp, int dir); 2040 2041 #ifdef CONFIG_IP_VS_IPV6 2042 void ip_vs_nat_icmp_v6(struct sk_buff *skb, struct ip_vs_protocol *pp, 2043 struct ip_vs_conn *cp, int dir); 2044 #endif 2045 2046 __sum16 ip_vs_checksum_complete(struct sk_buff *skb, int offset); 2047 2048 static inline __wsum ip_vs_check_diff4(__be32 old, __be32 new, __wsum oldsum) 2049 { 2050 __be32 diff[2] = { ~old, new }; 2051 2052 return csum_partial(diff, sizeof(diff), oldsum); 2053 } 2054 2055 #ifdef CONFIG_IP_VS_IPV6 2056 static inline __wsum ip_vs_check_diff16(const __be32 *old, const __be32 *new, 2057 __wsum oldsum) 2058 { 2059 __be32 diff[8] = { ~old[3], ~old[2], ~old[1], ~old[0], 2060 new[3], new[2], new[1], new[0] }; 2061 2062 return csum_partial(diff, sizeof(diff), oldsum); 2063 } 2064 #endif 2065 2066 static inline __wsum ip_vs_check_diff2(__be16 old, __be16 new, __wsum oldsum) 2067 { 2068 __be16 diff[2] = { ~old, new }; 2069 2070 return csum_partial(diff, sizeof(diff), oldsum); 2071 } 2072 2073 /* Forget current conntrack (unconfirmed) and attach notrack entry */ 2074 static inline void ip_vs_notrack(struct sk_buff *skb) 2075 { 2076 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) 2077 enum ip_conntrack_info ctinfo; 2078 struct nf_conn *ct = nf_ct_get(skb, &ctinfo); 2079 2080 if (ct) { 2081 nf_conntrack_put(&ct->ct_general); 2082 nf_ct_set(skb, NULL, IP_CT_UNTRACKED); 2083 } 2084 #endif 2085 } 2086 2087 #ifdef CONFIG_IP_VS_NFCT 2088 /* Netfilter connection tracking 2089 * (from ip_vs_nfct.c) 2090 */ 2091 static inline int ip_vs_conntrack_enabled(struct netns_ipvs *ipvs) 2092 { 2093 #ifdef CONFIG_SYSCTL 2094 return ipvs->sysctl_conntrack; 2095 #else 2096 return 0; 2097 #endif 2098 } 2099 2100 void ip_vs_update_conntrack(struct sk_buff *skb, struct ip_vs_conn *cp, 2101 int outin); 2102 int ip_vs_confirm_conntrack(struct sk_buff *skb); 2103 void ip_vs_nfct_expect_related(struct sk_buff *skb, struct nf_conn *ct, 2104 struct ip_vs_conn *cp, u_int8_t proto, 2105 const __be16 port, int from_rs); 2106 void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp); 2107 2108 #else 2109 2110 static inline int ip_vs_conntrack_enabled(struct netns_ipvs *ipvs) 2111 { 2112 return 0; 2113 } 2114 2115 static inline void ip_vs_update_conntrack(struct sk_buff *skb, 2116 struct ip_vs_conn *cp, int outin) 2117 { 2118 } 2119 2120 static inline int ip_vs_confirm_conntrack(struct sk_buff *skb) 2121 { 2122 return NF_ACCEPT; 2123 } 2124 2125 static inline void ip_vs_conn_drop_conntrack(struct ip_vs_conn *cp) 2126 { 2127 } 2128 #endif /* CONFIG_IP_VS_NFCT */ 2129 2130 /* Using old conntrack that can not be redirected to another real server? */ 2131 static inline bool ip_vs_conn_uses_old_conntrack(struct ip_vs_conn *cp, 2132 struct sk_buff *skb) 2133 { 2134 #ifdef CONFIG_IP_VS_NFCT 2135 enum ip_conntrack_info ctinfo; 2136 struct nf_conn *ct; 2137 2138 ct = nf_ct_get(skb, &ctinfo); 2139 if (ct && nf_ct_is_confirmed(ct)) 2140 return true; 2141 #endif 2142 return false; 2143 } 2144 2145 static inline int ip_vs_register_conntrack(struct ip_vs_service *svc) 2146 { 2147 #if IS_ENABLED(CONFIG_NF_CONNTRACK) 2148 int afmask = (svc->af == AF_INET6) ? 2 : 1; 2149 int ret = 0; 2150 2151 if (!(svc->conntrack_afmask & afmask)) { 2152 ret = nf_ct_netns_get(svc->ipvs->net, svc->af); 2153 if (ret >= 0) 2154 svc->conntrack_afmask |= afmask; 2155 } 2156 return ret; 2157 #else 2158 return 0; 2159 #endif 2160 } 2161 2162 static inline void ip_vs_unregister_conntrack(struct ip_vs_service *svc) 2163 { 2164 #if IS_ENABLED(CONFIG_NF_CONNTRACK) 2165 int afmask = (svc->af == AF_INET6) ? 2 : 1; 2166 2167 if (svc->conntrack_afmask & afmask) { 2168 nf_ct_netns_put(svc->ipvs->net, svc->af); 2169 svc->conntrack_afmask &= ~afmask; 2170 } 2171 #endif 2172 } 2173 2174 int ip_vs_register_hooks(struct netns_ipvs *ipvs, unsigned int af); 2175 void ip_vs_unregister_hooks(struct netns_ipvs *ipvs, unsigned int af); 2176 2177 static inline int 2178 ip_vs_dest_conn_overhead(struct ip_vs_dest *dest) 2179 { 2180 /* We think the overhead of processing active connections is 256 2181 * times higher than that of inactive connections in average. (This 2182 * 256 times might not be accurate, we will change it later) We 2183 * use the following formula to estimate the overhead now: 2184 * dest->activeconns*256 + dest->inactconns 2185 */ 2186 return (atomic_read(&dest->activeconns) << 8) + 2187 atomic_read(&dest->inactconns); 2188 } 2189 2190 #ifdef CONFIG_IP_VS_PROTO_TCP 2191 INDIRECT_CALLABLE_DECLARE(int 2192 tcp_snat_handler(struct sk_buff *skb, struct ip_vs_protocol *pp, 2193 struct ip_vs_conn *cp, struct ip_vs_iphdr *iph)); 2194 #endif 2195 2196 #ifdef CONFIG_IP_VS_PROTO_UDP 2197 INDIRECT_CALLABLE_DECLARE(int 2198 udp_snat_handler(struct sk_buff *skb, struct ip_vs_protocol *pp, 2199 struct ip_vs_conn *cp, struct ip_vs_iphdr *iph)); 2200 #endif 2201 #endif /* _NET_IP_VS_H */ 2202