1 /* 2 * IPVS An implementation of the IP virtual server support for the 3 * LINUX operating system. IPVS is now implemented as a module 4 * over the Netfilter framework. IPVS can be used to build a 5 * high-performance and highly available server based on a 6 * cluster of servers. 7 * 8 * Authors: Wensong Zhang <wensong@linuxvirtualserver.org> 9 * Peter Kese <peter.kese@ijs.si> 10 * Julian Anastasov <ja@ssi.bg> 11 * 12 * This program is free software; you can redistribute it and/or 13 * modify it under the terms of the GNU General Public License 14 * as published by the Free Software Foundation; either version 15 * 2 of the License, or (at your option) any later version. 16 * 17 * The IPVS code for kernel 2.2 was done by Wensong Zhang and Peter Kese, 18 * with changes/fixes from Julian Anastasov, Lars Marowsky-Bree, Horms 19 * and others. Many code here is taken from IP MASQ code of kernel 2.2. 20 * 21 * Changes: 22 * 23 */ 24 25 #define KMSG_COMPONENT "IPVS" 26 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt 27 28 #include <linux/interrupt.h> 29 #include <linux/in.h> 30 #include <linux/inet.h> 31 #include <linux/net.h> 32 #include <linux/kernel.h> 33 #include <linux/module.h> 34 #include <linux/vmalloc.h> 35 #include <linux/proc_fs.h> /* for proc_net_* */ 36 #include <linux/slab.h> 37 #include <linux/seq_file.h> 38 #include <linux/jhash.h> 39 #include <linux/random.h> 40 41 #include <net/net_namespace.h> 42 #include <net/ip_vs.h> 43 44 45 #ifndef CONFIG_IP_VS_TAB_BITS 46 #define CONFIG_IP_VS_TAB_BITS 12 47 #endif 48 49 /* 50 * Connection hash size. Default is what was selected at compile time. 51 */ 52 static int ip_vs_conn_tab_bits = CONFIG_IP_VS_TAB_BITS; 53 module_param_named(conn_tab_bits, ip_vs_conn_tab_bits, int, 0444); 54 MODULE_PARM_DESC(conn_tab_bits, "Set connections' hash size"); 55 56 /* size and mask values */ 57 int ip_vs_conn_tab_size __read_mostly; 58 static int ip_vs_conn_tab_mask __read_mostly; 59 60 /* 61 * Connection hash table: for input and output packets lookups of IPVS 62 */ 63 static struct hlist_head *ip_vs_conn_tab __read_mostly; 64 65 /* SLAB cache for IPVS connections */ 66 static struct kmem_cache *ip_vs_conn_cachep __read_mostly; 67 68 /* counter for no client port connections */ 69 static atomic_t ip_vs_conn_no_cport_cnt = ATOMIC_INIT(0); 70 71 /* random value for IPVS connection hash */ 72 static unsigned int ip_vs_conn_rnd __read_mostly; 73 74 /* 75 * Fine locking granularity for big connection hash table 76 */ 77 #define CT_LOCKARRAY_BITS 5 78 #define CT_LOCKARRAY_SIZE (1<<CT_LOCKARRAY_BITS) 79 #define CT_LOCKARRAY_MASK (CT_LOCKARRAY_SIZE-1) 80 81 /* We need an addrstrlen that works with or without v6 */ 82 #ifdef CONFIG_IP_VS_IPV6 83 #define IP_VS_ADDRSTRLEN INET6_ADDRSTRLEN 84 #else 85 #define IP_VS_ADDRSTRLEN (8+1) 86 #endif 87 88 struct ip_vs_aligned_lock 89 { 90 spinlock_t l; 91 } __attribute__((__aligned__(SMP_CACHE_BYTES))); 92 93 /* lock array for conn table */ 94 static struct ip_vs_aligned_lock 95 __ip_vs_conntbl_lock_array[CT_LOCKARRAY_SIZE] __cacheline_aligned; 96 97 static inline void ct_write_lock_bh(unsigned int key) 98 { 99 spin_lock_bh(&__ip_vs_conntbl_lock_array[key&CT_LOCKARRAY_MASK].l); 100 } 101 102 static inline void ct_write_unlock_bh(unsigned int key) 103 { 104 spin_unlock_bh(&__ip_vs_conntbl_lock_array[key&CT_LOCKARRAY_MASK].l); 105 } 106 107 static void ip_vs_conn_expire(struct timer_list *t); 108 109 /* 110 * Returns hash value for IPVS connection entry 111 */ 112 static unsigned int ip_vs_conn_hashkey(struct netns_ipvs *ipvs, int af, unsigned int proto, 113 const union nf_inet_addr *addr, 114 __be16 port) 115 { 116 #ifdef CONFIG_IP_VS_IPV6 117 if (af == AF_INET6) 118 return (jhash_3words(jhash(addr, 16, ip_vs_conn_rnd), 119 (__force u32)port, proto, ip_vs_conn_rnd) ^ 120 ((size_t)ipvs>>8)) & ip_vs_conn_tab_mask; 121 #endif 122 return (jhash_3words((__force u32)addr->ip, (__force u32)port, proto, 123 ip_vs_conn_rnd) ^ 124 ((size_t)ipvs>>8)) & ip_vs_conn_tab_mask; 125 } 126 127 static unsigned int ip_vs_conn_hashkey_param(const struct ip_vs_conn_param *p, 128 bool inverse) 129 { 130 const union nf_inet_addr *addr; 131 __be16 port; 132 133 if (p->pe_data && p->pe->hashkey_raw) 134 return p->pe->hashkey_raw(p, ip_vs_conn_rnd, inverse) & 135 ip_vs_conn_tab_mask; 136 137 if (likely(!inverse)) { 138 addr = p->caddr; 139 port = p->cport; 140 } else { 141 addr = p->vaddr; 142 port = p->vport; 143 } 144 145 return ip_vs_conn_hashkey(p->ipvs, p->af, p->protocol, addr, port); 146 } 147 148 static unsigned int ip_vs_conn_hashkey_conn(const struct ip_vs_conn *cp) 149 { 150 struct ip_vs_conn_param p; 151 152 ip_vs_conn_fill_param(cp->ipvs, cp->af, cp->protocol, 153 &cp->caddr, cp->cport, NULL, 0, &p); 154 155 if (cp->pe) { 156 p.pe = cp->pe; 157 p.pe_data = cp->pe_data; 158 p.pe_data_len = cp->pe_data_len; 159 } 160 161 return ip_vs_conn_hashkey_param(&p, false); 162 } 163 164 /* 165 * Hashes ip_vs_conn in ip_vs_conn_tab by netns,proto,addr,port. 166 * returns bool success. 167 */ 168 static inline int ip_vs_conn_hash(struct ip_vs_conn *cp) 169 { 170 unsigned int hash; 171 int ret; 172 173 if (cp->flags & IP_VS_CONN_F_ONE_PACKET) 174 return 0; 175 176 /* Hash by protocol, client address and port */ 177 hash = ip_vs_conn_hashkey_conn(cp); 178 179 ct_write_lock_bh(hash); 180 spin_lock(&cp->lock); 181 182 if (!(cp->flags & IP_VS_CONN_F_HASHED)) { 183 cp->flags |= IP_VS_CONN_F_HASHED; 184 refcount_inc(&cp->refcnt); 185 hlist_add_head_rcu(&cp->c_list, &ip_vs_conn_tab[hash]); 186 ret = 1; 187 } else { 188 pr_err("%s(): request for already hashed, called from %pS\n", 189 __func__, __builtin_return_address(0)); 190 ret = 0; 191 } 192 193 spin_unlock(&cp->lock); 194 ct_write_unlock_bh(hash); 195 196 return ret; 197 } 198 199 200 /* 201 * UNhashes ip_vs_conn from ip_vs_conn_tab. 202 * returns bool success. Caller should hold conn reference. 203 */ 204 static inline int ip_vs_conn_unhash(struct ip_vs_conn *cp) 205 { 206 unsigned int hash; 207 int ret; 208 209 /* unhash it and decrease its reference counter */ 210 hash = ip_vs_conn_hashkey_conn(cp); 211 212 ct_write_lock_bh(hash); 213 spin_lock(&cp->lock); 214 215 if (cp->flags & IP_VS_CONN_F_HASHED) { 216 hlist_del_rcu(&cp->c_list); 217 cp->flags &= ~IP_VS_CONN_F_HASHED; 218 refcount_dec(&cp->refcnt); 219 ret = 1; 220 } else 221 ret = 0; 222 223 spin_unlock(&cp->lock); 224 ct_write_unlock_bh(hash); 225 226 return ret; 227 } 228 229 /* Try to unlink ip_vs_conn from ip_vs_conn_tab. 230 * returns bool success. 231 */ 232 static inline bool ip_vs_conn_unlink(struct ip_vs_conn *cp) 233 { 234 unsigned int hash; 235 bool ret = false; 236 237 if (cp->flags & IP_VS_CONN_F_ONE_PACKET) 238 return refcount_dec_if_one(&cp->refcnt); 239 240 hash = ip_vs_conn_hashkey_conn(cp); 241 242 ct_write_lock_bh(hash); 243 spin_lock(&cp->lock); 244 245 if (cp->flags & IP_VS_CONN_F_HASHED) { 246 /* Decrease refcnt and unlink conn only if we are last user */ 247 if (refcount_dec_if_one(&cp->refcnt)) { 248 hlist_del_rcu(&cp->c_list); 249 cp->flags &= ~IP_VS_CONN_F_HASHED; 250 ret = true; 251 } 252 } 253 254 spin_unlock(&cp->lock); 255 ct_write_unlock_bh(hash); 256 257 return ret; 258 } 259 260 261 /* 262 * Gets ip_vs_conn associated with supplied parameters in the ip_vs_conn_tab. 263 * Called for pkts coming from OUTside-to-INside. 264 * p->caddr, p->cport: pkt source address (foreign host) 265 * p->vaddr, p->vport: pkt dest address (load balancer) 266 */ 267 static inline struct ip_vs_conn * 268 __ip_vs_conn_in_get(const struct ip_vs_conn_param *p) 269 { 270 unsigned int hash; 271 struct ip_vs_conn *cp; 272 273 hash = ip_vs_conn_hashkey_param(p, false); 274 275 rcu_read_lock(); 276 277 hlist_for_each_entry_rcu(cp, &ip_vs_conn_tab[hash], c_list) { 278 if (p->cport == cp->cport && p->vport == cp->vport && 279 cp->af == p->af && 280 ip_vs_addr_equal(p->af, p->caddr, &cp->caddr) && 281 ip_vs_addr_equal(p->af, p->vaddr, &cp->vaddr) && 282 ((!p->cport) ^ (!(cp->flags & IP_VS_CONN_F_NO_CPORT))) && 283 p->protocol == cp->protocol && 284 cp->ipvs == p->ipvs) { 285 if (!__ip_vs_conn_get(cp)) 286 continue; 287 /* HIT */ 288 rcu_read_unlock(); 289 return cp; 290 } 291 } 292 293 rcu_read_unlock(); 294 295 return NULL; 296 } 297 298 struct ip_vs_conn *ip_vs_conn_in_get(const struct ip_vs_conn_param *p) 299 { 300 struct ip_vs_conn *cp; 301 302 cp = __ip_vs_conn_in_get(p); 303 if (!cp && atomic_read(&ip_vs_conn_no_cport_cnt)) { 304 struct ip_vs_conn_param cport_zero_p = *p; 305 cport_zero_p.cport = 0; 306 cp = __ip_vs_conn_in_get(&cport_zero_p); 307 } 308 309 IP_VS_DBG_BUF(9, "lookup/in %s %s:%d->%s:%d %s\n", 310 ip_vs_proto_name(p->protocol), 311 IP_VS_DBG_ADDR(p->af, p->caddr), ntohs(p->cport), 312 IP_VS_DBG_ADDR(p->af, p->vaddr), ntohs(p->vport), 313 cp ? "hit" : "not hit"); 314 315 return cp; 316 } 317 318 static int 319 ip_vs_conn_fill_param_proto(struct netns_ipvs *ipvs, 320 int af, const struct sk_buff *skb, 321 const struct ip_vs_iphdr *iph, 322 struct ip_vs_conn_param *p) 323 { 324 __be16 _ports[2], *pptr; 325 326 pptr = frag_safe_skb_hp(skb, iph->len, sizeof(_ports), _ports); 327 if (pptr == NULL) 328 return 1; 329 330 if (likely(!ip_vs_iph_inverse(iph))) 331 ip_vs_conn_fill_param(ipvs, af, iph->protocol, &iph->saddr, 332 pptr[0], &iph->daddr, pptr[1], p); 333 else 334 ip_vs_conn_fill_param(ipvs, af, iph->protocol, &iph->daddr, 335 pptr[1], &iph->saddr, pptr[0], p); 336 return 0; 337 } 338 339 struct ip_vs_conn * 340 ip_vs_conn_in_get_proto(struct netns_ipvs *ipvs, int af, 341 const struct sk_buff *skb, 342 const struct ip_vs_iphdr *iph) 343 { 344 struct ip_vs_conn_param p; 345 346 if (ip_vs_conn_fill_param_proto(ipvs, af, skb, iph, &p)) 347 return NULL; 348 349 return ip_vs_conn_in_get(&p); 350 } 351 EXPORT_SYMBOL_GPL(ip_vs_conn_in_get_proto); 352 353 /* Get reference to connection template */ 354 struct ip_vs_conn *ip_vs_ct_in_get(const struct ip_vs_conn_param *p) 355 { 356 unsigned int hash; 357 struct ip_vs_conn *cp; 358 359 hash = ip_vs_conn_hashkey_param(p, false); 360 361 rcu_read_lock(); 362 363 hlist_for_each_entry_rcu(cp, &ip_vs_conn_tab[hash], c_list) { 364 if (unlikely(p->pe_data && p->pe->ct_match)) { 365 if (cp->ipvs != p->ipvs) 366 continue; 367 if (p->pe == cp->pe && p->pe->ct_match(p, cp)) { 368 if (__ip_vs_conn_get(cp)) 369 goto out; 370 } 371 continue; 372 } 373 374 if (cp->af == p->af && 375 ip_vs_addr_equal(p->af, p->caddr, &cp->caddr) && 376 /* protocol should only be IPPROTO_IP if 377 * p->vaddr is a fwmark */ 378 ip_vs_addr_equal(p->protocol == IPPROTO_IP ? AF_UNSPEC : 379 p->af, p->vaddr, &cp->vaddr) && 380 p->vport == cp->vport && p->cport == cp->cport && 381 cp->flags & IP_VS_CONN_F_TEMPLATE && 382 p->protocol == cp->protocol && 383 cp->ipvs == p->ipvs) { 384 if (__ip_vs_conn_get(cp)) 385 goto out; 386 } 387 } 388 cp = NULL; 389 390 out: 391 rcu_read_unlock(); 392 393 IP_VS_DBG_BUF(9, "template lookup/in %s %s:%d->%s:%d %s\n", 394 ip_vs_proto_name(p->protocol), 395 IP_VS_DBG_ADDR(p->af, p->caddr), ntohs(p->cport), 396 IP_VS_DBG_ADDR(p->af, p->vaddr), ntohs(p->vport), 397 cp ? "hit" : "not hit"); 398 399 return cp; 400 } 401 402 /* Gets ip_vs_conn associated with supplied parameters in the ip_vs_conn_tab. 403 * Called for pkts coming from inside-to-OUTside. 404 * p->caddr, p->cport: pkt source address (inside host) 405 * p->vaddr, p->vport: pkt dest address (foreign host) */ 406 struct ip_vs_conn *ip_vs_conn_out_get(const struct ip_vs_conn_param *p) 407 { 408 unsigned int hash; 409 struct ip_vs_conn *cp, *ret=NULL; 410 411 /* 412 * Check for "full" addressed entries 413 */ 414 hash = ip_vs_conn_hashkey_param(p, true); 415 416 rcu_read_lock(); 417 418 hlist_for_each_entry_rcu(cp, &ip_vs_conn_tab[hash], c_list) { 419 if (p->vport == cp->cport && p->cport == cp->dport && 420 cp->af == p->af && 421 ip_vs_addr_equal(p->af, p->vaddr, &cp->caddr) && 422 ip_vs_addr_equal(p->af, p->caddr, &cp->daddr) && 423 p->protocol == cp->protocol && 424 cp->ipvs == p->ipvs) { 425 if (!__ip_vs_conn_get(cp)) 426 continue; 427 /* HIT */ 428 ret = cp; 429 break; 430 } 431 } 432 433 rcu_read_unlock(); 434 435 IP_VS_DBG_BUF(9, "lookup/out %s %s:%d->%s:%d %s\n", 436 ip_vs_proto_name(p->protocol), 437 IP_VS_DBG_ADDR(p->af, p->caddr), ntohs(p->cport), 438 IP_VS_DBG_ADDR(p->af, p->vaddr), ntohs(p->vport), 439 ret ? "hit" : "not hit"); 440 441 return ret; 442 } 443 444 struct ip_vs_conn * 445 ip_vs_conn_out_get_proto(struct netns_ipvs *ipvs, int af, 446 const struct sk_buff *skb, 447 const struct ip_vs_iphdr *iph) 448 { 449 struct ip_vs_conn_param p; 450 451 if (ip_vs_conn_fill_param_proto(ipvs, af, skb, iph, &p)) 452 return NULL; 453 454 return ip_vs_conn_out_get(&p); 455 } 456 EXPORT_SYMBOL_GPL(ip_vs_conn_out_get_proto); 457 458 /* 459 * Put back the conn and restart its timer with its timeout 460 */ 461 static void __ip_vs_conn_put_timer(struct ip_vs_conn *cp) 462 { 463 unsigned long t = (cp->flags & IP_VS_CONN_F_ONE_PACKET) ? 464 0 : cp->timeout; 465 mod_timer(&cp->timer, jiffies+t); 466 467 __ip_vs_conn_put(cp); 468 } 469 470 void ip_vs_conn_put(struct ip_vs_conn *cp) 471 { 472 if ((cp->flags & IP_VS_CONN_F_ONE_PACKET) && 473 (refcount_read(&cp->refcnt) == 1) && 474 !timer_pending(&cp->timer)) 475 /* expire connection immediately */ 476 ip_vs_conn_expire(&cp->timer); 477 else 478 __ip_vs_conn_put_timer(cp); 479 } 480 481 /* 482 * Fill a no_client_port connection with a client port number 483 */ 484 void ip_vs_conn_fill_cport(struct ip_vs_conn *cp, __be16 cport) 485 { 486 if (ip_vs_conn_unhash(cp)) { 487 spin_lock_bh(&cp->lock); 488 if (cp->flags & IP_VS_CONN_F_NO_CPORT) { 489 atomic_dec(&ip_vs_conn_no_cport_cnt); 490 cp->flags &= ~IP_VS_CONN_F_NO_CPORT; 491 cp->cport = cport; 492 } 493 spin_unlock_bh(&cp->lock); 494 495 /* hash on new dport */ 496 ip_vs_conn_hash(cp); 497 } 498 } 499 500 501 /* 502 * Bind a connection entry with the corresponding packet_xmit. 503 * Called by ip_vs_conn_new. 504 */ 505 static inline void ip_vs_bind_xmit(struct ip_vs_conn *cp) 506 { 507 switch (IP_VS_FWD_METHOD(cp)) { 508 case IP_VS_CONN_F_MASQ: 509 cp->packet_xmit = ip_vs_nat_xmit; 510 break; 511 512 case IP_VS_CONN_F_TUNNEL: 513 #ifdef CONFIG_IP_VS_IPV6 514 if (cp->daf == AF_INET6) 515 cp->packet_xmit = ip_vs_tunnel_xmit_v6; 516 else 517 #endif 518 cp->packet_xmit = ip_vs_tunnel_xmit; 519 break; 520 521 case IP_VS_CONN_F_DROUTE: 522 cp->packet_xmit = ip_vs_dr_xmit; 523 break; 524 525 case IP_VS_CONN_F_LOCALNODE: 526 cp->packet_xmit = ip_vs_null_xmit; 527 break; 528 529 case IP_VS_CONN_F_BYPASS: 530 cp->packet_xmit = ip_vs_bypass_xmit; 531 break; 532 } 533 } 534 535 #ifdef CONFIG_IP_VS_IPV6 536 static inline void ip_vs_bind_xmit_v6(struct ip_vs_conn *cp) 537 { 538 switch (IP_VS_FWD_METHOD(cp)) { 539 case IP_VS_CONN_F_MASQ: 540 cp->packet_xmit = ip_vs_nat_xmit_v6; 541 break; 542 543 case IP_VS_CONN_F_TUNNEL: 544 if (cp->daf == AF_INET6) 545 cp->packet_xmit = ip_vs_tunnel_xmit_v6; 546 else 547 cp->packet_xmit = ip_vs_tunnel_xmit; 548 break; 549 550 case IP_VS_CONN_F_DROUTE: 551 cp->packet_xmit = ip_vs_dr_xmit_v6; 552 break; 553 554 case IP_VS_CONN_F_LOCALNODE: 555 cp->packet_xmit = ip_vs_null_xmit; 556 break; 557 558 case IP_VS_CONN_F_BYPASS: 559 cp->packet_xmit = ip_vs_bypass_xmit_v6; 560 break; 561 } 562 } 563 #endif 564 565 566 static inline int ip_vs_dest_totalconns(struct ip_vs_dest *dest) 567 { 568 return atomic_read(&dest->activeconns) 569 + atomic_read(&dest->inactconns); 570 } 571 572 /* 573 * Bind a connection entry with a virtual service destination 574 * Called just after a new connection entry is created. 575 */ 576 static inline void 577 ip_vs_bind_dest(struct ip_vs_conn *cp, struct ip_vs_dest *dest) 578 { 579 unsigned int conn_flags; 580 __u32 flags; 581 582 /* if dest is NULL, then return directly */ 583 if (!dest) 584 return; 585 586 /* Increase the refcnt counter of the dest */ 587 ip_vs_dest_hold(dest); 588 589 conn_flags = atomic_read(&dest->conn_flags); 590 if (cp->protocol != IPPROTO_UDP) 591 conn_flags &= ~IP_VS_CONN_F_ONE_PACKET; 592 flags = cp->flags; 593 /* Bind with the destination and its corresponding transmitter */ 594 if (flags & IP_VS_CONN_F_SYNC) { 595 /* if the connection is not template and is created 596 * by sync, preserve the activity flag. 597 */ 598 if (!(flags & IP_VS_CONN_F_TEMPLATE)) 599 conn_flags &= ~IP_VS_CONN_F_INACTIVE; 600 /* connections inherit forwarding method from dest */ 601 flags &= ~(IP_VS_CONN_F_FWD_MASK | IP_VS_CONN_F_NOOUTPUT); 602 } 603 flags |= conn_flags; 604 cp->flags = flags; 605 cp->dest = dest; 606 607 IP_VS_DBG_BUF(7, "Bind-dest %s c:%s:%d v:%s:%d " 608 "d:%s:%d fwd:%c s:%u conn->flags:%X conn->refcnt:%d " 609 "dest->refcnt:%d\n", 610 ip_vs_proto_name(cp->protocol), 611 IP_VS_DBG_ADDR(cp->af, &cp->caddr), ntohs(cp->cport), 612 IP_VS_DBG_ADDR(cp->af, &cp->vaddr), ntohs(cp->vport), 613 IP_VS_DBG_ADDR(cp->daf, &cp->daddr), ntohs(cp->dport), 614 ip_vs_fwd_tag(cp), cp->state, 615 cp->flags, refcount_read(&cp->refcnt), 616 refcount_read(&dest->refcnt)); 617 618 /* Update the connection counters */ 619 if (!(flags & IP_VS_CONN_F_TEMPLATE)) { 620 /* It is a normal connection, so modify the counters 621 * according to the flags, later the protocol can 622 * update them on state change 623 */ 624 if (!(flags & IP_VS_CONN_F_INACTIVE)) 625 atomic_inc(&dest->activeconns); 626 else 627 atomic_inc(&dest->inactconns); 628 } else { 629 /* It is a persistent connection/template, so increase 630 the persistent connection counter */ 631 atomic_inc(&dest->persistconns); 632 } 633 634 if (dest->u_threshold != 0 && 635 ip_vs_dest_totalconns(dest) >= dest->u_threshold) 636 dest->flags |= IP_VS_DEST_F_OVERLOAD; 637 } 638 639 640 /* 641 * Check if there is a destination for the connection, if so 642 * bind the connection to the destination. 643 */ 644 void ip_vs_try_bind_dest(struct ip_vs_conn *cp) 645 { 646 struct ip_vs_dest *dest; 647 648 rcu_read_lock(); 649 650 /* This function is only invoked by the synchronization code. We do 651 * not currently support heterogeneous pools with synchronization, 652 * so we can make the assumption that the svc_af is the same as the 653 * dest_af 654 */ 655 dest = ip_vs_find_dest(cp->ipvs, cp->af, cp->af, &cp->daddr, 656 cp->dport, &cp->vaddr, cp->vport, 657 cp->protocol, cp->fwmark, cp->flags); 658 if (dest) { 659 struct ip_vs_proto_data *pd; 660 661 spin_lock_bh(&cp->lock); 662 if (cp->dest) { 663 spin_unlock_bh(&cp->lock); 664 rcu_read_unlock(); 665 return; 666 } 667 668 /* Applications work depending on the forwarding method 669 * but better to reassign them always when binding dest */ 670 if (cp->app) 671 ip_vs_unbind_app(cp); 672 673 ip_vs_bind_dest(cp, dest); 674 spin_unlock_bh(&cp->lock); 675 676 /* Update its packet transmitter */ 677 cp->packet_xmit = NULL; 678 #ifdef CONFIG_IP_VS_IPV6 679 if (cp->af == AF_INET6) 680 ip_vs_bind_xmit_v6(cp); 681 else 682 #endif 683 ip_vs_bind_xmit(cp); 684 685 pd = ip_vs_proto_data_get(cp->ipvs, cp->protocol); 686 if (pd && atomic_read(&pd->appcnt)) 687 ip_vs_bind_app(cp, pd->pp); 688 } 689 rcu_read_unlock(); 690 } 691 692 693 /* 694 * Unbind a connection entry with its VS destination 695 * Called by the ip_vs_conn_expire function. 696 */ 697 static inline void ip_vs_unbind_dest(struct ip_vs_conn *cp) 698 { 699 struct ip_vs_dest *dest = cp->dest; 700 701 if (!dest) 702 return; 703 704 IP_VS_DBG_BUF(7, "Unbind-dest %s c:%s:%d v:%s:%d " 705 "d:%s:%d fwd:%c s:%u conn->flags:%X conn->refcnt:%d " 706 "dest->refcnt:%d\n", 707 ip_vs_proto_name(cp->protocol), 708 IP_VS_DBG_ADDR(cp->af, &cp->caddr), ntohs(cp->cport), 709 IP_VS_DBG_ADDR(cp->af, &cp->vaddr), ntohs(cp->vport), 710 IP_VS_DBG_ADDR(cp->daf, &cp->daddr), ntohs(cp->dport), 711 ip_vs_fwd_tag(cp), cp->state, 712 cp->flags, refcount_read(&cp->refcnt), 713 refcount_read(&dest->refcnt)); 714 715 /* Update the connection counters */ 716 if (!(cp->flags & IP_VS_CONN_F_TEMPLATE)) { 717 /* It is a normal connection, so decrease the inactconns 718 or activeconns counter */ 719 if (cp->flags & IP_VS_CONN_F_INACTIVE) { 720 atomic_dec(&dest->inactconns); 721 } else { 722 atomic_dec(&dest->activeconns); 723 } 724 } else { 725 /* It is a persistent connection/template, so decrease 726 the persistent connection counter */ 727 atomic_dec(&dest->persistconns); 728 } 729 730 if (dest->l_threshold != 0) { 731 if (ip_vs_dest_totalconns(dest) < dest->l_threshold) 732 dest->flags &= ~IP_VS_DEST_F_OVERLOAD; 733 } else if (dest->u_threshold != 0) { 734 if (ip_vs_dest_totalconns(dest) * 4 < dest->u_threshold * 3) 735 dest->flags &= ~IP_VS_DEST_F_OVERLOAD; 736 } else { 737 if (dest->flags & IP_VS_DEST_F_OVERLOAD) 738 dest->flags &= ~IP_VS_DEST_F_OVERLOAD; 739 } 740 741 ip_vs_dest_put(dest); 742 } 743 744 static int expire_quiescent_template(struct netns_ipvs *ipvs, 745 struct ip_vs_dest *dest) 746 { 747 #ifdef CONFIG_SYSCTL 748 return ipvs->sysctl_expire_quiescent_template && 749 (atomic_read(&dest->weight) == 0); 750 #else 751 return 0; 752 #endif 753 } 754 755 /* 756 * Checking if the destination of a connection template is available. 757 * If available, return 1, otherwise invalidate this connection 758 * template and return 0. 759 */ 760 int ip_vs_check_template(struct ip_vs_conn *ct, struct ip_vs_dest *cdest) 761 { 762 struct ip_vs_dest *dest = ct->dest; 763 struct netns_ipvs *ipvs = ct->ipvs; 764 765 /* 766 * Checking the dest server status. 767 */ 768 if ((dest == NULL) || 769 !(dest->flags & IP_VS_DEST_F_AVAILABLE) || 770 expire_quiescent_template(ipvs, dest) || 771 (cdest && (dest != cdest))) { 772 IP_VS_DBG_BUF(9, "check_template: dest not available for " 773 "protocol %s s:%s:%d v:%s:%d " 774 "-> d:%s:%d\n", 775 ip_vs_proto_name(ct->protocol), 776 IP_VS_DBG_ADDR(ct->af, &ct->caddr), 777 ntohs(ct->cport), 778 IP_VS_DBG_ADDR(ct->af, &ct->vaddr), 779 ntohs(ct->vport), 780 IP_VS_DBG_ADDR(ct->daf, &ct->daddr), 781 ntohs(ct->dport)); 782 783 /* 784 * Invalidate the connection template 785 */ 786 if (ct->vport != htons(0xffff)) { 787 if (ip_vs_conn_unhash(ct)) { 788 ct->dport = htons(0xffff); 789 ct->vport = htons(0xffff); 790 ct->cport = 0; 791 ip_vs_conn_hash(ct); 792 } 793 } 794 795 /* 796 * Simply decrease the refcnt of the template, 797 * don't restart its timer. 798 */ 799 __ip_vs_conn_put(ct); 800 return 0; 801 } 802 return 1; 803 } 804 805 static void ip_vs_conn_rcu_free(struct rcu_head *head) 806 { 807 struct ip_vs_conn *cp = container_of(head, struct ip_vs_conn, 808 rcu_head); 809 810 ip_vs_pe_put(cp->pe); 811 kfree(cp->pe_data); 812 kmem_cache_free(ip_vs_conn_cachep, cp); 813 } 814 815 static void ip_vs_conn_expire(struct timer_list *t) 816 { 817 struct ip_vs_conn *cp = from_timer(cp, t, timer); 818 struct netns_ipvs *ipvs = cp->ipvs; 819 820 /* 821 * do I control anybody? 822 */ 823 if (atomic_read(&cp->n_control)) 824 goto expire_later; 825 826 /* Unlink conn if not referenced anymore */ 827 if (likely(ip_vs_conn_unlink(cp))) { 828 /* delete the timer if it is activated by other users */ 829 del_timer(&cp->timer); 830 831 /* does anybody control me? */ 832 if (cp->control) 833 ip_vs_control_del(cp); 834 835 if ((cp->flags & IP_VS_CONN_F_NFCT) && 836 !(cp->flags & IP_VS_CONN_F_ONE_PACKET)) { 837 /* Do not access conntracks during subsys cleanup 838 * because nf_conntrack_find_get can not be used after 839 * conntrack cleanup for the net. 840 */ 841 smp_rmb(); 842 if (ipvs->enable) 843 ip_vs_conn_drop_conntrack(cp); 844 } 845 846 if (unlikely(cp->app != NULL)) 847 ip_vs_unbind_app(cp); 848 ip_vs_unbind_dest(cp); 849 if (cp->flags & IP_VS_CONN_F_NO_CPORT) 850 atomic_dec(&ip_vs_conn_no_cport_cnt); 851 if (cp->flags & IP_VS_CONN_F_ONE_PACKET) 852 ip_vs_conn_rcu_free(&cp->rcu_head); 853 else 854 call_rcu(&cp->rcu_head, ip_vs_conn_rcu_free); 855 atomic_dec(&ipvs->conn_count); 856 return; 857 } 858 859 expire_later: 860 IP_VS_DBG(7, "delayed: conn->refcnt=%d conn->n_control=%d\n", 861 refcount_read(&cp->refcnt), 862 atomic_read(&cp->n_control)); 863 864 refcount_inc(&cp->refcnt); 865 cp->timeout = 60*HZ; 866 867 if (ipvs->sync_state & IP_VS_STATE_MASTER) 868 ip_vs_sync_conn(ipvs, cp, sysctl_sync_threshold(ipvs)); 869 870 __ip_vs_conn_put_timer(cp); 871 } 872 873 /* Modify timer, so that it expires as soon as possible. 874 * Can be called without reference only if under RCU lock. 875 */ 876 void ip_vs_conn_expire_now(struct ip_vs_conn *cp) 877 { 878 /* Using mod_timer_pending will ensure the timer is not 879 * modified after the final del_timer in ip_vs_conn_expire. 880 */ 881 if (timer_pending(&cp->timer) && 882 time_after(cp->timer.expires, jiffies)) 883 mod_timer_pending(&cp->timer, jiffies); 884 } 885 886 887 /* 888 * Create a new connection entry and hash it into the ip_vs_conn_tab 889 */ 890 struct ip_vs_conn * 891 ip_vs_conn_new(const struct ip_vs_conn_param *p, int dest_af, 892 const union nf_inet_addr *daddr, __be16 dport, unsigned int flags, 893 struct ip_vs_dest *dest, __u32 fwmark) 894 { 895 struct ip_vs_conn *cp; 896 struct netns_ipvs *ipvs = p->ipvs; 897 struct ip_vs_proto_data *pd = ip_vs_proto_data_get(p->ipvs, 898 p->protocol); 899 900 cp = kmem_cache_alloc(ip_vs_conn_cachep, GFP_ATOMIC); 901 if (cp == NULL) { 902 IP_VS_ERR_RL("%s(): no memory\n", __func__); 903 return NULL; 904 } 905 906 INIT_HLIST_NODE(&cp->c_list); 907 timer_setup(&cp->timer, ip_vs_conn_expire, 0); 908 cp->ipvs = ipvs; 909 cp->af = p->af; 910 cp->daf = dest_af; 911 cp->protocol = p->protocol; 912 ip_vs_addr_set(p->af, &cp->caddr, p->caddr); 913 cp->cport = p->cport; 914 /* proto should only be IPPROTO_IP if p->vaddr is a fwmark */ 915 ip_vs_addr_set(p->protocol == IPPROTO_IP ? AF_UNSPEC : p->af, 916 &cp->vaddr, p->vaddr); 917 cp->vport = p->vport; 918 ip_vs_addr_set(cp->daf, &cp->daddr, daddr); 919 cp->dport = dport; 920 cp->flags = flags; 921 cp->fwmark = fwmark; 922 if (flags & IP_VS_CONN_F_TEMPLATE && p->pe) { 923 ip_vs_pe_get(p->pe); 924 cp->pe = p->pe; 925 cp->pe_data = p->pe_data; 926 cp->pe_data_len = p->pe_data_len; 927 } else { 928 cp->pe = NULL; 929 cp->pe_data = NULL; 930 cp->pe_data_len = 0; 931 } 932 spin_lock_init(&cp->lock); 933 934 /* 935 * Set the entry is referenced by the current thread before hashing 936 * it in the table, so that other thread run ip_vs_random_dropentry 937 * but cannot drop this entry. 938 */ 939 refcount_set(&cp->refcnt, 1); 940 941 cp->control = NULL; 942 atomic_set(&cp->n_control, 0); 943 atomic_set(&cp->in_pkts, 0); 944 945 cp->packet_xmit = NULL; 946 cp->app = NULL; 947 cp->app_data = NULL; 948 /* reset struct ip_vs_seq */ 949 cp->in_seq.delta = 0; 950 cp->out_seq.delta = 0; 951 952 atomic_inc(&ipvs->conn_count); 953 if (flags & IP_VS_CONN_F_NO_CPORT) 954 atomic_inc(&ip_vs_conn_no_cport_cnt); 955 956 /* Bind the connection with a destination server */ 957 cp->dest = NULL; 958 ip_vs_bind_dest(cp, dest); 959 960 /* Set its state and timeout */ 961 cp->state = 0; 962 cp->old_state = 0; 963 cp->timeout = 3*HZ; 964 cp->sync_endtime = jiffies & ~3UL; 965 966 /* Bind its packet transmitter */ 967 #ifdef CONFIG_IP_VS_IPV6 968 if (p->af == AF_INET6) 969 ip_vs_bind_xmit_v6(cp); 970 else 971 #endif 972 ip_vs_bind_xmit(cp); 973 974 if (unlikely(pd && atomic_read(&pd->appcnt))) 975 ip_vs_bind_app(cp, pd->pp); 976 977 /* 978 * Allow conntrack to be preserved. By default, conntrack 979 * is created and destroyed for every packet. 980 * Sometimes keeping conntrack can be useful for 981 * IP_VS_CONN_F_ONE_PACKET too. 982 */ 983 984 if (ip_vs_conntrack_enabled(ipvs)) 985 cp->flags |= IP_VS_CONN_F_NFCT; 986 987 /* Hash it in the ip_vs_conn_tab finally */ 988 ip_vs_conn_hash(cp); 989 990 return cp; 991 } 992 993 /* 994 * /proc/net/ip_vs_conn entries 995 */ 996 #ifdef CONFIG_PROC_FS 997 struct ip_vs_iter_state { 998 struct seq_net_private p; 999 struct hlist_head *l; 1000 }; 1001 1002 static void *ip_vs_conn_array(struct seq_file *seq, loff_t pos) 1003 { 1004 int idx; 1005 struct ip_vs_conn *cp; 1006 struct ip_vs_iter_state *iter = seq->private; 1007 1008 for (idx = 0; idx < ip_vs_conn_tab_size; idx++) { 1009 hlist_for_each_entry_rcu(cp, &ip_vs_conn_tab[idx], c_list) { 1010 /* __ip_vs_conn_get() is not needed by 1011 * ip_vs_conn_seq_show and ip_vs_conn_sync_seq_show 1012 */ 1013 if (pos-- == 0) { 1014 iter->l = &ip_vs_conn_tab[idx]; 1015 return cp; 1016 } 1017 } 1018 cond_resched_rcu(); 1019 } 1020 1021 return NULL; 1022 } 1023 1024 static void *ip_vs_conn_seq_start(struct seq_file *seq, loff_t *pos) 1025 __acquires(RCU) 1026 { 1027 struct ip_vs_iter_state *iter = seq->private; 1028 1029 iter->l = NULL; 1030 rcu_read_lock(); 1031 return *pos ? ip_vs_conn_array(seq, *pos - 1) :SEQ_START_TOKEN; 1032 } 1033 1034 static void *ip_vs_conn_seq_next(struct seq_file *seq, void *v, loff_t *pos) 1035 { 1036 struct ip_vs_conn *cp = v; 1037 struct ip_vs_iter_state *iter = seq->private; 1038 struct hlist_node *e; 1039 struct hlist_head *l = iter->l; 1040 int idx; 1041 1042 ++*pos; 1043 if (v == SEQ_START_TOKEN) 1044 return ip_vs_conn_array(seq, 0); 1045 1046 /* more on same hash chain? */ 1047 e = rcu_dereference(hlist_next_rcu(&cp->c_list)); 1048 if (e) 1049 return hlist_entry(e, struct ip_vs_conn, c_list); 1050 1051 idx = l - ip_vs_conn_tab; 1052 while (++idx < ip_vs_conn_tab_size) { 1053 hlist_for_each_entry_rcu(cp, &ip_vs_conn_tab[idx], c_list) { 1054 iter->l = &ip_vs_conn_tab[idx]; 1055 return cp; 1056 } 1057 cond_resched_rcu(); 1058 } 1059 iter->l = NULL; 1060 return NULL; 1061 } 1062 1063 static void ip_vs_conn_seq_stop(struct seq_file *seq, void *v) 1064 __releases(RCU) 1065 { 1066 rcu_read_unlock(); 1067 } 1068 1069 static int ip_vs_conn_seq_show(struct seq_file *seq, void *v) 1070 { 1071 1072 if (v == SEQ_START_TOKEN) 1073 seq_puts(seq, 1074 "Pro FromIP FPrt ToIP TPrt DestIP DPrt State Expires PEName PEData\n"); 1075 else { 1076 const struct ip_vs_conn *cp = v; 1077 struct net *net = seq_file_net(seq); 1078 char pe_data[IP_VS_PENAME_MAXLEN + IP_VS_PEDATA_MAXLEN + 3]; 1079 size_t len = 0; 1080 char dbuf[IP_VS_ADDRSTRLEN]; 1081 1082 if (!net_eq(cp->ipvs->net, net)) 1083 return 0; 1084 if (cp->pe_data) { 1085 pe_data[0] = ' '; 1086 len = strlen(cp->pe->name); 1087 memcpy(pe_data + 1, cp->pe->name, len); 1088 pe_data[len + 1] = ' '; 1089 len += 2; 1090 len += cp->pe->show_pe_data(cp, pe_data + len); 1091 } 1092 pe_data[len] = '\0'; 1093 1094 #ifdef CONFIG_IP_VS_IPV6 1095 if (cp->daf == AF_INET6) 1096 snprintf(dbuf, sizeof(dbuf), "%pI6", &cp->daddr.in6); 1097 else 1098 #endif 1099 snprintf(dbuf, sizeof(dbuf), "%08X", 1100 ntohl(cp->daddr.ip)); 1101 1102 #ifdef CONFIG_IP_VS_IPV6 1103 if (cp->af == AF_INET6) 1104 seq_printf(seq, "%-3s %pI6 %04X %pI6 %04X " 1105 "%s %04X %-11s %7lu%s\n", 1106 ip_vs_proto_name(cp->protocol), 1107 &cp->caddr.in6, ntohs(cp->cport), 1108 &cp->vaddr.in6, ntohs(cp->vport), 1109 dbuf, ntohs(cp->dport), 1110 ip_vs_state_name(cp->protocol, cp->state), 1111 (cp->timer.expires-jiffies)/HZ, pe_data); 1112 else 1113 #endif 1114 seq_printf(seq, 1115 "%-3s %08X %04X %08X %04X" 1116 " %s %04X %-11s %7lu%s\n", 1117 ip_vs_proto_name(cp->protocol), 1118 ntohl(cp->caddr.ip), ntohs(cp->cport), 1119 ntohl(cp->vaddr.ip), ntohs(cp->vport), 1120 dbuf, ntohs(cp->dport), 1121 ip_vs_state_name(cp->protocol, cp->state), 1122 (cp->timer.expires-jiffies)/HZ, pe_data); 1123 } 1124 return 0; 1125 } 1126 1127 static const struct seq_operations ip_vs_conn_seq_ops = { 1128 .start = ip_vs_conn_seq_start, 1129 .next = ip_vs_conn_seq_next, 1130 .stop = ip_vs_conn_seq_stop, 1131 .show = ip_vs_conn_seq_show, 1132 }; 1133 1134 static const char *ip_vs_origin_name(unsigned int flags) 1135 { 1136 if (flags & IP_VS_CONN_F_SYNC) 1137 return "SYNC"; 1138 else 1139 return "LOCAL"; 1140 } 1141 1142 static int ip_vs_conn_sync_seq_show(struct seq_file *seq, void *v) 1143 { 1144 char dbuf[IP_VS_ADDRSTRLEN]; 1145 1146 if (v == SEQ_START_TOKEN) 1147 seq_puts(seq, 1148 "Pro FromIP FPrt ToIP TPrt DestIP DPrt State Origin Expires\n"); 1149 else { 1150 const struct ip_vs_conn *cp = v; 1151 struct net *net = seq_file_net(seq); 1152 1153 if (!net_eq(cp->ipvs->net, net)) 1154 return 0; 1155 1156 #ifdef CONFIG_IP_VS_IPV6 1157 if (cp->daf == AF_INET6) 1158 snprintf(dbuf, sizeof(dbuf), "%pI6", &cp->daddr.in6); 1159 else 1160 #endif 1161 snprintf(dbuf, sizeof(dbuf), "%08X", 1162 ntohl(cp->daddr.ip)); 1163 1164 #ifdef CONFIG_IP_VS_IPV6 1165 if (cp->af == AF_INET6) 1166 seq_printf(seq, "%-3s %pI6 %04X %pI6 %04X " 1167 "%s %04X %-11s %-6s %7lu\n", 1168 ip_vs_proto_name(cp->protocol), 1169 &cp->caddr.in6, ntohs(cp->cport), 1170 &cp->vaddr.in6, ntohs(cp->vport), 1171 dbuf, ntohs(cp->dport), 1172 ip_vs_state_name(cp->protocol, cp->state), 1173 ip_vs_origin_name(cp->flags), 1174 (cp->timer.expires-jiffies)/HZ); 1175 else 1176 #endif 1177 seq_printf(seq, 1178 "%-3s %08X %04X %08X %04X " 1179 "%s %04X %-11s %-6s %7lu\n", 1180 ip_vs_proto_name(cp->protocol), 1181 ntohl(cp->caddr.ip), ntohs(cp->cport), 1182 ntohl(cp->vaddr.ip), ntohs(cp->vport), 1183 dbuf, ntohs(cp->dport), 1184 ip_vs_state_name(cp->protocol, cp->state), 1185 ip_vs_origin_name(cp->flags), 1186 (cp->timer.expires-jiffies)/HZ); 1187 } 1188 return 0; 1189 } 1190 1191 static const struct seq_operations ip_vs_conn_sync_seq_ops = { 1192 .start = ip_vs_conn_seq_start, 1193 .next = ip_vs_conn_seq_next, 1194 .stop = ip_vs_conn_seq_stop, 1195 .show = ip_vs_conn_sync_seq_show, 1196 }; 1197 #endif 1198 1199 1200 /* 1201 * Randomly drop connection entries before running out of memory 1202 */ 1203 static inline int todrop_entry(struct ip_vs_conn *cp) 1204 { 1205 /* 1206 * The drop rate array needs tuning for real environments. 1207 * Called from timer bh only => no locking 1208 */ 1209 static const char todrop_rate[9] = {0, 1, 2, 3, 4, 5, 6, 7, 8}; 1210 static char todrop_counter[9] = {0}; 1211 int i; 1212 1213 /* if the conn entry hasn't lasted for 60 seconds, don't drop it. 1214 This will leave enough time for normal connection to get 1215 through. */ 1216 if (time_before(cp->timeout + jiffies, cp->timer.expires + 60*HZ)) 1217 return 0; 1218 1219 /* Don't drop the entry if its number of incoming packets is not 1220 located in [0, 8] */ 1221 i = atomic_read(&cp->in_pkts); 1222 if (i > 8 || i < 0) return 0; 1223 1224 if (!todrop_rate[i]) return 0; 1225 if (--todrop_counter[i] > 0) return 0; 1226 1227 todrop_counter[i] = todrop_rate[i]; 1228 return 1; 1229 } 1230 1231 static inline bool ip_vs_conn_ops_mode(struct ip_vs_conn *cp) 1232 { 1233 struct ip_vs_service *svc; 1234 1235 if (!cp->dest) 1236 return false; 1237 svc = rcu_dereference(cp->dest->svc); 1238 return svc && (svc->flags & IP_VS_SVC_F_ONEPACKET); 1239 } 1240 1241 /* Called from keventd and must protect itself from softirqs */ 1242 void ip_vs_random_dropentry(struct netns_ipvs *ipvs) 1243 { 1244 int idx; 1245 struct ip_vs_conn *cp, *cp_c; 1246 1247 rcu_read_lock(); 1248 /* 1249 * Randomly scan 1/32 of the whole table every second 1250 */ 1251 for (idx = 0; idx < (ip_vs_conn_tab_size>>5); idx++) { 1252 unsigned int hash = prandom_u32() & ip_vs_conn_tab_mask; 1253 1254 hlist_for_each_entry_rcu(cp, &ip_vs_conn_tab[hash], c_list) { 1255 if (cp->ipvs != ipvs) 1256 continue; 1257 if (cp->flags & IP_VS_CONN_F_TEMPLATE) { 1258 if (atomic_read(&cp->n_control) || 1259 !ip_vs_conn_ops_mode(cp)) 1260 continue; 1261 else 1262 /* connection template of OPS */ 1263 goto try_drop; 1264 } 1265 if (cp->protocol == IPPROTO_TCP) { 1266 switch(cp->state) { 1267 case IP_VS_TCP_S_SYN_RECV: 1268 case IP_VS_TCP_S_SYNACK: 1269 break; 1270 1271 case IP_VS_TCP_S_ESTABLISHED: 1272 if (todrop_entry(cp)) 1273 break; 1274 continue; 1275 1276 default: 1277 continue; 1278 } 1279 } else if (cp->protocol == IPPROTO_SCTP) { 1280 switch (cp->state) { 1281 case IP_VS_SCTP_S_INIT1: 1282 case IP_VS_SCTP_S_INIT: 1283 break; 1284 case IP_VS_SCTP_S_ESTABLISHED: 1285 if (todrop_entry(cp)) 1286 break; 1287 continue; 1288 default: 1289 continue; 1290 } 1291 } else { 1292 try_drop: 1293 if (!todrop_entry(cp)) 1294 continue; 1295 } 1296 1297 IP_VS_DBG(4, "del connection\n"); 1298 ip_vs_conn_expire_now(cp); 1299 cp_c = cp->control; 1300 /* cp->control is valid only with reference to cp */ 1301 if (cp_c && __ip_vs_conn_get(cp)) { 1302 IP_VS_DBG(4, "del conn template\n"); 1303 ip_vs_conn_expire_now(cp_c); 1304 __ip_vs_conn_put(cp); 1305 } 1306 } 1307 cond_resched_rcu(); 1308 } 1309 rcu_read_unlock(); 1310 } 1311 1312 1313 /* 1314 * Flush all the connection entries in the ip_vs_conn_tab 1315 */ 1316 static void ip_vs_conn_flush(struct netns_ipvs *ipvs) 1317 { 1318 int idx; 1319 struct ip_vs_conn *cp, *cp_c; 1320 1321 flush_again: 1322 rcu_read_lock(); 1323 for (idx = 0; idx < ip_vs_conn_tab_size; idx++) { 1324 1325 hlist_for_each_entry_rcu(cp, &ip_vs_conn_tab[idx], c_list) { 1326 if (cp->ipvs != ipvs) 1327 continue; 1328 IP_VS_DBG(4, "del connection\n"); 1329 ip_vs_conn_expire_now(cp); 1330 cp_c = cp->control; 1331 /* cp->control is valid only with reference to cp */ 1332 if (cp_c && __ip_vs_conn_get(cp)) { 1333 IP_VS_DBG(4, "del conn template\n"); 1334 ip_vs_conn_expire_now(cp_c); 1335 __ip_vs_conn_put(cp); 1336 } 1337 } 1338 cond_resched_rcu(); 1339 } 1340 rcu_read_unlock(); 1341 1342 /* the counter may be not NULL, because maybe some conn entries 1343 are run by slow timer handler or unhashed but still referred */ 1344 if (atomic_read(&ipvs->conn_count) != 0) { 1345 schedule(); 1346 goto flush_again; 1347 } 1348 } 1349 /* 1350 * per netns init and exit 1351 */ 1352 int __net_init ip_vs_conn_net_init(struct netns_ipvs *ipvs) 1353 { 1354 atomic_set(&ipvs->conn_count, 0); 1355 1356 proc_create_net("ip_vs_conn", 0, ipvs->net->proc_net, 1357 &ip_vs_conn_seq_ops, sizeof(struct ip_vs_iter_state)); 1358 proc_create_net("ip_vs_conn_sync", 0, ipvs->net->proc_net, 1359 &ip_vs_conn_sync_seq_ops, 1360 sizeof(struct ip_vs_iter_state)); 1361 return 0; 1362 } 1363 1364 void __net_exit ip_vs_conn_net_cleanup(struct netns_ipvs *ipvs) 1365 { 1366 /* flush all the connection entries first */ 1367 ip_vs_conn_flush(ipvs); 1368 remove_proc_entry("ip_vs_conn", ipvs->net->proc_net); 1369 remove_proc_entry("ip_vs_conn_sync", ipvs->net->proc_net); 1370 } 1371 1372 int __init ip_vs_conn_init(void) 1373 { 1374 int idx; 1375 1376 /* Compute size and mask */ 1377 ip_vs_conn_tab_size = 1 << ip_vs_conn_tab_bits; 1378 ip_vs_conn_tab_mask = ip_vs_conn_tab_size - 1; 1379 1380 /* 1381 * Allocate the connection hash table and initialize its list heads 1382 */ 1383 ip_vs_conn_tab = vmalloc(array_size(ip_vs_conn_tab_size, 1384 sizeof(*ip_vs_conn_tab))); 1385 if (!ip_vs_conn_tab) 1386 return -ENOMEM; 1387 1388 /* Allocate ip_vs_conn slab cache */ 1389 ip_vs_conn_cachep = kmem_cache_create("ip_vs_conn", 1390 sizeof(struct ip_vs_conn), 0, 1391 SLAB_HWCACHE_ALIGN, NULL); 1392 if (!ip_vs_conn_cachep) { 1393 vfree(ip_vs_conn_tab); 1394 return -ENOMEM; 1395 } 1396 1397 pr_info("Connection hash table configured " 1398 "(size=%d, memory=%ldKbytes)\n", 1399 ip_vs_conn_tab_size, 1400 (long)(ip_vs_conn_tab_size*sizeof(struct list_head))/1024); 1401 IP_VS_DBG(0, "Each connection entry needs %zd bytes at least\n", 1402 sizeof(struct ip_vs_conn)); 1403 1404 for (idx = 0; idx < ip_vs_conn_tab_size; idx++) 1405 INIT_HLIST_HEAD(&ip_vs_conn_tab[idx]); 1406 1407 for (idx = 0; idx < CT_LOCKARRAY_SIZE; idx++) { 1408 spin_lock_init(&__ip_vs_conntbl_lock_array[idx].l); 1409 } 1410 1411 /* calculate the random value for connection hash */ 1412 get_random_bytes(&ip_vs_conn_rnd, sizeof(ip_vs_conn_rnd)); 1413 1414 return 0; 1415 } 1416 1417 void ip_vs_conn_cleanup(void) 1418 { 1419 /* Wait all ip_vs_conn_rcu_free() callbacks to complete */ 1420 rcu_barrier(); 1421 /* Release the empty cache */ 1422 kmem_cache_destroy(ip_vs_conn_cachep); 1423 vfree(ip_vs_conn_tab); 1424 } 1425