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ipvs: try also real server with port 0 in backup server
[linux-2.6/btrfs-unstable.git] / net / netfilter / ipvs / ip_vs_conn.c
blob29fa5badde757d6de0ac2fc0359cc27ba37ff83b
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/net.h>
31 #include <linux/kernel.h>
32 #include <linux/module.h>
33 #include <linux/vmalloc.h>
34 #include <linux/proc_fs.h> /* for proc_net_* */
35 #include <linux/slab.h>
36 #include <linux/seq_file.h>
37 #include <linux/jhash.h>
38 #include <linux/random.h>
39
40 #include <net/net_namespace.h>
41 #include <net/ip_vs.h>
42
43
44 #ifndef CONFIG_IP_VS_TAB_BITS
45 #define CONFIG_IP_VS_TAB_BITS 12
46 #endif
47
48 /*
49 * Connection hash size. Default is what was selected at compile time.
50 */
51 static int ip_vs_conn_tab_bits = CONFIG_IP_VS_TAB_BITS;
52 module_param_named(conn_tab_bits, ip_vs_conn_tab_bits, int, 0444);
53 MODULE_PARM_DESC(conn_tab_bits, "Set connections' hash size");
54
55 /* size and mask values */
56 int ip_vs_conn_tab_size __read_mostly;
57 static int ip_vs_conn_tab_mask __read_mostly;
58
59 /*
60 * Connection hash table: for input and output packets lookups of IPVS
61 */
62 static struct hlist_head *ip_vs_conn_tab __read_mostly;
63
64 /* SLAB cache for IPVS connections */
65 static struct kmem_cache *ip_vs_conn_cachep __read_mostly;
66
67 /* counter for no client port connections */
68 static atomic_t ip_vs_conn_no_cport_cnt = ATOMIC_INIT(0);
69
70 /* random value for IPVS connection hash */
71 static unsigned int ip_vs_conn_rnd __read_mostly;
72
73 /*
74 * Fine locking granularity for big connection hash table
75 */
76 #define CT_LOCKARRAY_BITS 5
77 #define CT_LOCKARRAY_SIZE (1<<CT_LOCKARRAY_BITS)
78 #define CT_LOCKARRAY_MASK (CT_LOCKARRAY_SIZE-1)
79
80 struct ip_vs_aligned_lock
81 {
82 rwlock_t l;
83 } __attribute__((__aligned__(SMP_CACHE_BYTES)));
84
85 /* lock array for conn table */
86 static struct ip_vs_aligned_lock
87 __ip_vs_conntbl_lock_array[CT_LOCKARRAY_SIZE] __cacheline_aligned;
88
89 static inline void ct_read_lock(unsigned key)
90 {
91 read_lock(&__ip_vs_conntbl_lock_array[key&CT_LOCKARRAY_MASK].l);
92 }
93
94 static inline void ct_read_unlock(unsigned key)
95 {
96 read_unlock(&__ip_vs_conntbl_lock_array[key&CT_LOCKARRAY_MASK].l);
97 }
98
99 static inline void ct_write_lock(unsigned key)
100 {
101 write_lock(&__ip_vs_conntbl_lock_array[key&CT_LOCKARRAY_MASK].l);
102 }
103
104 static inline void ct_write_unlock(unsigned key)
105 {
106 write_unlock(&__ip_vs_conntbl_lock_array[key&CT_LOCKARRAY_MASK].l);
107 }
108
109 static inline void ct_read_lock_bh(unsigned key)
110 {
111 read_lock_bh(&__ip_vs_conntbl_lock_array[key&CT_LOCKARRAY_MASK].l);
112 }
113
114 static inline void ct_read_unlock_bh(unsigned key)
115 {
116 read_unlock_bh(&__ip_vs_conntbl_lock_array[key&CT_LOCKARRAY_MASK].l);
117 }
118
119 static inline void ct_write_lock_bh(unsigned key)
120 {
121 write_lock_bh(&__ip_vs_conntbl_lock_array[key&CT_LOCKARRAY_MASK].l);
122 }
123
124 static inline void ct_write_unlock_bh(unsigned key)
125 {
126 write_unlock_bh(&__ip_vs_conntbl_lock_array[key&CT_LOCKARRAY_MASK].l);
127 }
128
129
130 /*
131 * Returns hash value for IPVS connection entry
132 */
133 static unsigned int ip_vs_conn_hashkey(struct net *net, int af, unsigned proto,
134 const union nf_inet_addr *addr,
135 __be16 port)
136 {
137 #ifdef CONFIG_IP_VS_IPV6
138 if (af == AF_INET6)
139 return (jhash_3words(jhash(addr, 16, ip_vs_conn_rnd),
140 (__force u32)port, proto, ip_vs_conn_rnd) ^
141 ((size_t)net>>8)) & ip_vs_conn_tab_mask;
142 #endif
143 return (jhash_3words((__force u32)addr->ip, (__force u32)port, proto,
144 ip_vs_conn_rnd) ^
145 ((size_t)net>>8)) & ip_vs_conn_tab_mask;
146 }
147
148 static unsigned int ip_vs_conn_hashkey_param(const struct ip_vs_conn_param *p,
149 bool inverse)
150 {
151 const union nf_inet_addr *addr;
152 __be16 port;
153
154 if (p->pe_data && p->pe->hashkey_raw)
155 return p->pe->hashkey_raw(p, ip_vs_conn_rnd, inverse) &
156 ip_vs_conn_tab_mask;
157
158 if (likely(!inverse)) {
159 addr = p->caddr;
160 port = p->cport;
161 } else {
162 addr = p->vaddr;
163 port = p->vport;
164 }
165
166 return ip_vs_conn_hashkey(p->net, p->af, p->protocol, addr, port);
167 }
168
169 static unsigned int ip_vs_conn_hashkey_conn(const struct ip_vs_conn *cp)
170 {
171 struct ip_vs_conn_param p;
172
173 ip_vs_conn_fill_param(ip_vs_conn_net(cp), cp->af, cp->protocol,
174 &cp->caddr, cp->cport, NULL, 0, &p);
175
176 if (cp->pe) {
177 p.pe = cp->pe;
178 p.pe_data = cp->pe_data;
179 p.pe_data_len = cp->pe_data_len;
180 }
181
182 return ip_vs_conn_hashkey_param(&p, false);
183 }
184
185 /*
186 * Hashes ip_vs_conn in ip_vs_conn_tab by netns,proto,addr,port.
187 * returns bool success.
188 */
189 static inline int ip_vs_conn_hash(struct ip_vs_conn *cp)
190 {
191 unsigned hash;
192 int ret;
193
194 if (cp->flags & IP_VS_CONN_F_ONE_PACKET)
195 return 0;
196
197 /* Hash by protocol, client address and port */
198 hash = ip_vs_conn_hashkey_conn(cp);
199
200 ct_write_lock(hash);
201 spin_lock(&cp->lock);
202
203 if (!(cp->flags & IP_VS_CONN_F_HASHED)) {
204 hlist_add_head(&cp->c_list, &ip_vs_conn_tab[hash]);
205 cp->flags |= IP_VS_CONN_F_HASHED;
206 atomic_inc(&cp->refcnt);
207 ret = 1;
208 } else {
209 pr_err("%s(): request for already hashed, called from %pF\n",
210 __func__, __builtin_return_address(0));
211 ret = 0;
212 }
213
214 spin_unlock(&cp->lock);
215 ct_write_unlock(hash);
216
217 return ret;
218 }
219
220
221 /*
222 * UNhashes ip_vs_conn from ip_vs_conn_tab.
223 * returns bool success.
224 */
225 static inline int ip_vs_conn_unhash(struct ip_vs_conn *cp)
226 {
227 unsigned hash;
228 int ret;
229
230 /* unhash it and decrease its reference counter */
231 hash = ip_vs_conn_hashkey_conn(cp);
232
233 ct_write_lock(hash);
234 spin_lock(&cp->lock);
235
236 if (cp->flags & IP_VS_CONN_F_HASHED) {
237 hlist_del(&cp->c_list);
238 cp->flags &= ~IP_VS_CONN_F_HASHED;
239 atomic_dec(&cp->refcnt);
240 ret = 1;
241 } else
242 ret = 0;
243
244 spin_unlock(&cp->lock);
245 ct_write_unlock(hash);
246
247 return ret;
248 }
249
250
251 /*
252 * Gets ip_vs_conn associated with supplied parameters in the ip_vs_conn_tab.
253 * Called for pkts coming from OUTside-to-INside.
254 * p->caddr, p->cport: pkt source address (foreign host)
255 * p->vaddr, p->vport: pkt dest address (load balancer)
256 */
257 static inline struct ip_vs_conn *
258 __ip_vs_conn_in_get(const struct ip_vs_conn_param *p)
259 {
260 unsigned hash;
261 struct ip_vs_conn *cp;
262 struct hlist_node *n;
263
264 hash = ip_vs_conn_hashkey_param(p, false);
265
266 ct_read_lock(hash);
267
268 hlist_for_each_entry(cp, n, &ip_vs_conn_tab[hash], c_list) {
269 if (cp->af == p->af &&
270 p->cport == cp->cport && p->vport == cp->vport &&
271 ip_vs_addr_equal(p->af, p->caddr, &cp->caddr) &&
272 ip_vs_addr_equal(p->af, p->vaddr, &cp->vaddr) &&
273 ((!p->cport) ^ (!(cp->flags & IP_VS_CONN_F_NO_CPORT))) &&
274 p->protocol == cp->protocol &&
275 ip_vs_conn_net_eq(cp, p->net)) {
276 /* HIT */
277 atomic_inc(&cp->refcnt);
278 ct_read_unlock(hash);
279 return cp;
280 }
281 }
282
283 ct_read_unlock(hash);
284
285 return NULL;
286 }
287
288 struct ip_vs_conn *ip_vs_conn_in_get(const struct ip_vs_conn_param *p)
289 {
290 struct ip_vs_conn *cp;
291
292 cp = __ip_vs_conn_in_get(p);
293 if (!cp && atomic_read(&ip_vs_conn_no_cport_cnt)) {
294 struct ip_vs_conn_param cport_zero_p = *p;
295 cport_zero_p.cport = 0;
296 cp = __ip_vs_conn_in_get(&cport_zero_p);
297 }
298
299 IP_VS_DBG_BUF(9, "lookup/in %s %s:%d->%s:%d %s\n",
300 ip_vs_proto_name(p->protocol),
301 IP_VS_DBG_ADDR(p->af, p->caddr), ntohs(p->cport),
302 IP_VS_DBG_ADDR(p->af, p->vaddr), ntohs(p->vport),
303 cp ? "hit" : "not hit");
304
305 return cp;
306 }
307
308 static int
309 ip_vs_conn_fill_param_proto(int af, const struct sk_buff *skb,
310 const struct ip_vs_iphdr *iph,
311 unsigned int proto_off, int inverse,
312 struct ip_vs_conn_param *p)
313 {
314 __be16 _ports[2], *pptr;
315 struct net *net = skb_net(skb);
316
317 pptr = skb_header_pointer(skb, proto_off, sizeof(_ports), _ports);
318 if (pptr == NULL)
319 return 1;
320
321 if (likely(!inverse))
322 ip_vs_conn_fill_param(net, af, iph->protocol, &iph->saddr,
323 pptr[0], &iph->daddr, pptr[1], p);
324 else
325 ip_vs_conn_fill_param(net, af, iph->protocol, &iph->daddr,
326 pptr[1], &iph->saddr, pptr[0], p);
327 return 0;
328 }
329
330 struct ip_vs_conn *
331 ip_vs_conn_in_get_proto(int af, const struct sk_buff *skb,
332 const struct ip_vs_iphdr *iph,
333 unsigned int proto_off, int inverse)
334 {
335 struct ip_vs_conn_param p;
336
337 if (ip_vs_conn_fill_param_proto(af, skb, iph, proto_off, inverse, &p))
338 return NULL;
339
340 return ip_vs_conn_in_get(&p);
341 }
342 EXPORT_SYMBOL_GPL(ip_vs_conn_in_get_proto);
343
344 /* Get reference to connection template */
345 struct ip_vs_conn *ip_vs_ct_in_get(const struct ip_vs_conn_param *p)
346 {
347 unsigned hash;
348 struct ip_vs_conn *cp;
349 struct hlist_node *n;
350
351 hash = ip_vs_conn_hashkey_param(p, false);
352
353 ct_read_lock(hash);
354
355 hlist_for_each_entry(cp, n, &ip_vs_conn_tab[hash], c_list) {
356 if (!ip_vs_conn_net_eq(cp, p->net))
357 continue;
358 if (p->pe_data && p->pe->ct_match) {
359 if (p->pe == cp->pe && p->pe->ct_match(p, cp))
360 goto out;
361 continue;
362 }
363
364 if (cp->af == p->af &&
365 ip_vs_addr_equal(p->af, p->caddr, &cp->caddr) &&
366 /* protocol should only be IPPROTO_IP if
367 * p->vaddr is a fwmark */
368 ip_vs_addr_equal(p->protocol == IPPROTO_IP ? AF_UNSPEC :
369 p->af, p->vaddr, &cp->vaddr) &&
370 p->cport == cp->cport && p->vport == cp->vport &&
371 cp->flags & IP_VS_CONN_F_TEMPLATE &&
372 p->protocol == cp->protocol)
373 goto out;
374 }
375 cp = NULL;
376
377 out:
378 if (cp)
379 atomic_inc(&cp->refcnt);
380 ct_read_unlock(hash);
381
382 IP_VS_DBG_BUF(9, "template lookup/in %s %s:%d->%s:%d %s\n",
383 ip_vs_proto_name(p->protocol),
384 IP_VS_DBG_ADDR(p->af, p->caddr), ntohs(p->cport),
385 IP_VS_DBG_ADDR(p->af, p->vaddr), ntohs(p->vport),
386 cp ? "hit" : "not hit");
387
388 return cp;
389 }
390
391 /* Gets ip_vs_conn associated with supplied parameters in the ip_vs_conn_tab.
392 * Called for pkts coming from inside-to-OUTside.
393 * p->caddr, p->cport: pkt source address (inside host)
394 * p->vaddr, p->vport: pkt dest address (foreign host) */
395 struct ip_vs_conn *ip_vs_conn_out_get(const struct ip_vs_conn_param *p)
396 {
397 unsigned hash;
398 struct ip_vs_conn *cp, *ret=NULL;
399 struct hlist_node *n;
400
401 /*
402 * Check for "full" addressed entries
403 */
404 hash = ip_vs_conn_hashkey_param(p, true);
405
406 ct_read_lock(hash);
407
408 hlist_for_each_entry(cp, n, &ip_vs_conn_tab[hash], c_list) {
409 if (cp->af == p->af &&
410 p->vport == cp->cport && p->cport == cp->dport &&
411 ip_vs_addr_equal(p->af, p->vaddr, &cp->caddr) &&
412 ip_vs_addr_equal(p->af, p->caddr, &cp->daddr) &&
413 p->protocol == cp->protocol &&
414 ip_vs_conn_net_eq(cp, p->net)) {
415 /* HIT */
416 atomic_inc(&cp->refcnt);
417 ret = cp;
418 break;
419 }
420 }
421
422 ct_read_unlock(hash);
423
424 IP_VS_DBG_BUF(9, "lookup/out %s %s:%d->%s:%d %s\n",
425 ip_vs_proto_name(p->protocol),
426 IP_VS_DBG_ADDR(p->af, p->caddr), ntohs(p->cport),
427 IP_VS_DBG_ADDR(p->af, p->vaddr), ntohs(p->vport),
428 ret ? "hit" : "not hit");
429
430 return ret;
431 }
432
433 struct ip_vs_conn *
434 ip_vs_conn_out_get_proto(int af, const struct sk_buff *skb,
435 const struct ip_vs_iphdr *iph,
436 unsigned int proto_off, int inverse)
437 {
438 struct ip_vs_conn_param p;
439
440 if (ip_vs_conn_fill_param_proto(af, skb, iph, proto_off, inverse, &p))
441 return NULL;
442
443 return ip_vs_conn_out_get(&p);
444 }
445 EXPORT_SYMBOL_GPL(ip_vs_conn_out_get_proto);
446
447 /*
448 * Put back the conn and restart its timer with its timeout
449 */
450 void ip_vs_conn_put(struct ip_vs_conn *cp)
451 {
452 unsigned long t = (cp->flags & IP_VS_CONN_F_ONE_PACKET) ?
453 0 : cp->timeout;
454 mod_timer(&cp->timer, jiffies+t);
455
456 __ip_vs_conn_put(cp);
457 }
458
459
460 /*
461 * Fill a no_client_port connection with a client port number
462 */
463 void ip_vs_conn_fill_cport(struct ip_vs_conn *cp, __be16 cport)
464 {
465 if (ip_vs_conn_unhash(cp)) {
466 spin_lock(&cp->lock);
467 if (cp->flags & IP_VS_CONN_F_NO_CPORT) {
468 atomic_dec(&ip_vs_conn_no_cport_cnt);
469 cp->flags &= ~IP_VS_CONN_F_NO_CPORT;
470 cp->cport = cport;
471 }
472 spin_unlock(&cp->lock);
473
474 /* hash on new dport */
475 ip_vs_conn_hash(cp);
476 }
477 }
478
479
480 /*
481 * Bind a connection entry with the corresponding packet_xmit.
482 * Called by ip_vs_conn_new.
483 */
484 static inline void ip_vs_bind_xmit(struct ip_vs_conn *cp)
485 {
486 switch (IP_VS_FWD_METHOD(cp)) {
487 case IP_VS_CONN_F_MASQ:
488 cp->packet_xmit = ip_vs_nat_xmit;
489 break;
490
491 case IP_VS_CONN_F_TUNNEL:
492 cp->packet_xmit = ip_vs_tunnel_xmit;
493 break;
494
495 case IP_VS_CONN_F_DROUTE:
496 cp->packet_xmit = ip_vs_dr_xmit;
497 break;
498
499 case IP_VS_CONN_F_LOCALNODE:
500 cp->packet_xmit = ip_vs_null_xmit;
501 break;
502
503 case IP_VS_CONN_F_BYPASS:
504 cp->packet_xmit = ip_vs_bypass_xmit;
505 break;
506 }
507 }
508
509 #ifdef CONFIG_IP_VS_IPV6
510 static inline void ip_vs_bind_xmit_v6(struct ip_vs_conn *cp)
511 {
512 switch (IP_VS_FWD_METHOD(cp)) {
513 case IP_VS_CONN_F_MASQ:
514 cp->packet_xmit = ip_vs_nat_xmit_v6;
515 break;
516
517 case IP_VS_CONN_F_TUNNEL:
518 cp->packet_xmit = ip_vs_tunnel_xmit_v6;
519 break;
520
521 case IP_VS_CONN_F_DROUTE:
522 cp->packet_xmit = ip_vs_dr_xmit_v6;
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_v6;
531 break;
532 }
533 }
534 #endif
535
536
537 static inline int ip_vs_dest_totalconns(struct ip_vs_dest *dest)
538 {
539 return atomic_read(&dest->activeconns)
540 + atomic_read(&dest->inactconns);
541 }
542
543 /*
544 * Bind a connection entry with a virtual service destination
545 * Called just after a new connection entry is created.
546 */
547 static inline void
548 ip_vs_bind_dest(struct ip_vs_conn *cp, struct ip_vs_dest *dest)
549 {
550 unsigned int conn_flags;
551
552 /* if dest is NULL, then return directly */
553 if (!dest)
554 return;
555
556 /* Increase the refcnt counter of the dest */
557 atomic_inc(&dest->refcnt);
558
559 conn_flags = atomic_read(&dest->conn_flags);
560 if (cp->protocol != IPPROTO_UDP)
561 conn_flags &= ~IP_VS_CONN_F_ONE_PACKET;
562 /* Bind with the destination and its corresponding transmitter */
563 if (cp->flags & IP_VS_CONN_F_SYNC) {
564 /* if the connection is not template and is created
565 * by sync, preserve the activity flag.
566 */
567 if (!(cp->flags & IP_VS_CONN_F_TEMPLATE))
568 conn_flags &= ~IP_VS_CONN_F_INACTIVE;
569 /* connections inherit forwarding method from dest */
570 cp->flags &= ~IP_VS_CONN_F_FWD_MASK;
571 }
572 cp->flags |= conn_flags;
573 cp->dest = dest;
574
575 IP_VS_DBG_BUF(7, "Bind-dest %s c:%s:%d v:%s:%d "
576 "d:%s:%d fwd:%c s:%u conn->flags:%X conn->refcnt:%d "
577 "dest->refcnt:%d\n",
578 ip_vs_proto_name(cp->protocol),
579 IP_VS_DBG_ADDR(cp->af, &cp->caddr), ntohs(cp->cport),
580 IP_VS_DBG_ADDR(cp->af, &cp->vaddr), ntohs(cp->vport),
581 IP_VS_DBG_ADDR(cp->af, &cp->daddr), ntohs(cp->dport),
582 ip_vs_fwd_tag(cp), cp->state,
583 cp->flags, atomic_read(&cp->refcnt),
584 atomic_read(&dest->refcnt));
585
586 /* Update the connection counters */
587 if (!(cp->flags & IP_VS_CONN_F_TEMPLATE)) {
588 /* It is a normal connection, so increase the inactive
589 connection counter because it is in TCP SYNRECV
590 state (inactive) or other protocol inacive state */
591 if ((cp->flags & IP_VS_CONN_F_SYNC) &&
592 (!(cp->flags & IP_VS_CONN_F_INACTIVE)))
593 atomic_inc(&dest->activeconns);
594 else
595 atomic_inc(&dest->inactconns);
596 } else {
597 /* It is a persistent connection/template, so increase
598 the persistent connection counter */
599 atomic_inc(&dest->persistconns);
600 }
601
602 if (dest->u_threshold != 0 &&
603 ip_vs_dest_totalconns(dest) >= dest->u_threshold)
604 dest->flags |= IP_VS_DEST_F_OVERLOAD;
605 }
606
607
608 /*
609 * Check if there is a destination for the connection, if so
610 * bind the connection to the destination.
611 */
612 struct ip_vs_dest *ip_vs_try_bind_dest(struct ip_vs_conn *cp)
613 {
614 struct ip_vs_dest *dest;
615
616 if ((cp) && (!cp->dest)) {
617 dest = ip_vs_find_dest(ip_vs_conn_net(cp), cp->af, &cp->daddr,
618 cp->dport, &cp->vaddr, cp->vport,
619 cp->protocol, cp->fwmark, cp->flags);
620 ip_vs_bind_dest(cp, dest);
621 return dest;
622 } else
623 return NULL;
624 }
625
626
627 /*
628 * Unbind a connection entry with its VS destination
629 * Called by the ip_vs_conn_expire function.
630 */
631 static inline void ip_vs_unbind_dest(struct ip_vs_conn *cp)
632 {
633 struct ip_vs_dest *dest = cp->dest;
634
635 if (!dest)
636 return;
637
638 IP_VS_DBG_BUF(7, "Unbind-dest %s c:%s:%d v:%s:%d "
639 "d:%s:%d fwd:%c s:%u conn->flags:%X conn->refcnt:%d "
640 "dest->refcnt:%d\n",
641 ip_vs_proto_name(cp->protocol),
642 IP_VS_DBG_ADDR(cp->af, &cp->caddr), ntohs(cp->cport),
643 IP_VS_DBG_ADDR(cp->af, &cp->vaddr), ntohs(cp->vport),
644 IP_VS_DBG_ADDR(cp->af, &cp->daddr), ntohs(cp->dport),
645 ip_vs_fwd_tag(cp), cp->state,
646 cp->flags, atomic_read(&cp->refcnt),
647 atomic_read(&dest->refcnt));
648
649 /* Update the connection counters */
650 if (!(cp->flags & IP_VS_CONN_F_TEMPLATE)) {
651 /* It is a normal connection, so decrease the inactconns
652 or activeconns counter */
653 if (cp->flags & IP_VS_CONN_F_INACTIVE) {
654 atomic_dec(&dest->inactconns);
655 } else {
656 atomic_dec(&dest->activeconns);
657 }
658 } else {
659 /* It is a persistent connection/template, so decrease
660 the persistent connection counter */
661 atomic_dec(&dest->persistconns);
662 }
663
664 if (dest->l_threshold != 0) {
665 if (ip_vs_dest_totalconns(dest) < dest->l_threshold)
666 dest->flags &= ~IP_VS_DEST_F_OVERLOAD;
667 } else if (dest->u_threshold != 0) {
668 if (ip_vs_dest_totalconns(dest) * 4 < dest->u_threshold * 3)
669 dest->flags &= ~IP_VS_DEST_F_OVERLOAD;
670 } else {
671 if (dest->flags & IP_VS_DEST_F_OVERLOAD)
672 dest->flags &= ~IP_VS_DEST_F_OVERLOAD;
673 }
674
675 /*
676 * Simply decrease the refcnt of the dest, because the
677 * dest will be either in service's destination list
678 * or in the trash.
679 */
680 atomic_dec(&dest->refcnt);
681 }
682
683 static int expire_quiescent_template(struct netns_ipvs *ipvs,
684 struct ip_vs_dest *dest)
685 {
686 #ifdef CONFIG_SYSCTL
687 return ipvs->sysctl_expire_quiescent_template &&
688 (atomic_read(&dest->weight) == 0);
689 #else
690 return 0;
691 #endif
692 }
693
694 /*
695 * Checking if the destination of a connection template is available.
696 * If available, return 1, otherwise invalidate this connection
697 * template and return 0.
698 */
699 int ip_vs_check_template(struct ip_vs_conn *ct)
700 {
701 struct ip_vs_dest *dest = ct->dest;
702 struct netns_ipvs *ipvs = net_ipvs(ip_vs_conn_net(ct));
703
704 /*
705 * Checking the dest server status.
706 */
707 if ((dest == NULL) ||
708 !(dest->flags & IP_VS_DEST_F_AVAILABLE) ||
709 expire_quiescent_template(ipvs, dest)) {
710 IP_VS_DBG_BUF(9, "check_template: dest not available for "
711 "protocol %s s:%s:%d v:%s:%d "
712 "-> d:%s:%d\n",
713 ip_vs_proto_name(ct->protocol),
714 IP_VS_DBG_ADDR(ct->af, &ct->caddr),
715 ntohs(ct->cport),
716 IP_VS_DBG_ADDR(ct->af, &ct->vaddr),
717 ntohs(ct->vport),
718 IP_VS_DBG_ADDR(ct->af, &ct->daddr),
719 ntohs(ct->dport));
720
721 /*
722 * Invalidate the connection template
723 */
724 if (ct->vport != htons(0xffff)) {
725 if (ip_vs_conn_unhash(ct)) {
726 ct->dport = htons(0xffff);
727 ct->vport = htons(0xffff);
728 ct->cport = 0;
729 ip_vs_conn_hash(ct);
730 }
731 }
732
733 /*
734 * Simply decrease the refcnt of the template,
735 * don't restart its timer.
736 */
737 atomic_dec(&ct->refcnt);
738 return 0;
739 }
740 return 1;
741 }
742
743 static void ip_vs_conn_expire(unsigned long data)
744 {
745 struct ip_vs_conn *cp = (struct ip_vs_conn *)data;
746 struct netns_ipvs *ipvs = net_ipvs(ip_vs_conn_net(cp));
747
748 cp->timeout = 60*HZ;
749
750 /*
751 * hey, I'm using it
752 */
753 atomic_inc(&cp->refcnt);
754
755 /*
756 * do I control anybody?
757 */
758 if (atomic_read(&cp->n_control))
759 goto expire_later;
760
761 /*
762 * unhash it if it is hashed in the conn table
763 */
764 if (!ip_vs_conn_unhash(cp) && !(cp->flags & IP_VS_CONN_F_ONE_PACKET))
765 goto expire_later;
766
767 /*
768 * refcnt==1 implies I'm the only one referrer
769 */
770 if (likely(atomic_read(&cp->refcnt) == 1)) {
771 /* delete the timer if it is activated by other users */
772 if (timer_pending(&cp->timer))
773 del_timer(&cp->timer);
774
775 /* does anybody control me? */
776 if (cp->control)
777 ip_vs_control_del(cp);
778
779 if (cp->flags & IP_VS_CONN_F_NFCT) {
780 ip_vs_conn_drop_conntrack(cp);
781 /* Do not access conntracks during subsys cleanup
782 * because nf_conntrack_find_get can not be used after
783 * conntrack cleanup for the net.
784 */
785 smp_rmb();
786 if (ipvs->enable)
787 ip_vs_conn_drop_conntrack(cp);
788 }
789
790 ip_vs_pe_put(cp->pe);
791 kfree(cp->pe_data);
792 if (unlikely(cp->app != NULL))
793 ip_vs_unbind_app(cp);
794 ip_vs_unbind_dest(cp);
795 if (cp->flags & IP_VS_CONN_F_NO_CPORT)
796 atomic_dec(&ip_vs_conn_no_cport_cnt);
797 atomic_dec(&ipvs->conn_count);
798
799 kmem_cache_free(ip_vs_conn_cachep, cp);
800 return;
801 }
802
803 /* hash it back to the table */
804 ip_vs_conn_hash(cp);
805
806 expire_later:
807 IP_VS_DBG(7, "delayed: conn->refcnt-1=%d conn->n_control=%d\n",
808 atomic_read(&cp->refcnt)-1,
809 atomic_read(&cp->n_control));
810
811 ip_vs_conn_put(cp);
812 }
813
814
815 void ip_vs_conn_expire_now(struct ip_vs_conn *cp)
816 {
817 if (del_timer(&cp->timer))
818 mod_timer(&cp->timer, jiffies);
819 }
820
821
822 /*
823 * Create a new connection entry and hash it into the ip_vs_conn_tab
824 */
825 struct ip_vs_conn *
826 ip_vs_conn_new(const struct ip_vs_conn_param *p,
827 const union nf_inet_addr *daddr, __be16 dport, unsigned flags,
828 struct ip_vs_dest *dest, __u32 fwmark)
829 {
830 struct ip_vs_conn *cp;
831 struct netns_ipvs *ipvs = net_ipvs(p->net);
832 struct ip_vs_proto_data *pd = ip_vs_proto_data_get(p->net,
833 p->protocol);
834
835 cp = kmem_cache_zalloc(ip_vs_conn_cachep, GFP_ATOMIC);
836 if (cp == NULL) {
837 IP_VS_ERR_RL("%s(): no memory\n", __func__);
838 return NULL;
839 }
840
841 INIT_HLIST_NODE(&cp->c_list);
842 setup_timer(&cp->timer, ip_vs_conn_expire, (unsigned long)cp);
843 ip_vs_conn_net_set(cp, p->net);
844 cp->af = p->af;
845 cp->protocol = p->protocol;
846 ip_vs_addr_copy(p->af, &cp->caddr, p->caddr);
847 cp->cport = p->cport;
848 ip_vs_addr_copy(p->af, &cp->vaddr, p->vaddr);
849 cp->vport = p->vport;
850 /* proto should only be IPPROTO_IP if d_addr is a fwmark */
851 ip_vs_addr_copy(p->protocol == IPPROTO_IP ? AF_UNSPEC : p->af,
852 &cp->daddr, daddr);
853 cp->dport = dport;
854 cp->flags = flags;
855 cp->fwmark = fwmark;
856 if (flags & IP_VS_CONN_F_TEMPLATE && p->pe) {
857 ip_vs_pe_get(p->pe);
858 cp->pe = p->pe;
859 cp->pe_data = p->pe_data;
860 cp->pe_data_len = p->pe_data_len;
861 }
862 spin_lock_init(&cp->lock);
863
864 /*
865 * Set the entry is referenced by the current thread before hashing
866 * it in the table, so that other thread run ip_vs_random_dropentry
867 * but cannot drop this entry.
868 */
869 atomic_set(&cp->refcnt, 1);
870
871 atomic_set(&cp->n_control, 0);
872 atomic_set(&cp->in_pkts, 0);
873
874 atomic_inc(&ipvs->conn_count);
875 if (flags & IP_VS_CONN_F_NO_CPORT)
876 atomic_inc(&ip_vs_conn_no_cport_cnt);
877
878 /* Bind the connection with a destination server */
879 ip_vs_bind_dest(cp, dest);
880
881 /* Set its state and timeout */
882 cp->state = 0;
883 cp->timeout = 3*HZ;
884
885 /* Bind its packet transmitter */
886 #ifdef CONFIG_IP_VS_IPV6
887 if (p->af == AF_INET6)
888 ip_vs_bind_xmit_v6(cp);
889 else
890 #endif
891 ip_vs_bind_xmit(cp);
892
893 if (unlikely(pd && atomic_read(&pd->appcnt)))
894 ip_vs_bind_app(cp, pd->pp);
895
896 /*
897 * Allow conntrack to be preserved. By default, conntrack
898 * is created and destroyed for every packet.
899 * Sometimes keeping conntrack can be useful for
900 * IP_VS_CONN_F_ONE_PACKET too.
901 */
902
903 if (ip_vs_conntrack_enabled(ipvs))
904 cp->flags |= IP_VS_CONN_F_NFCT;
905
906 /* Hash it in the ip_vs_conn_tab finally */
907 ip_vs_conn_hash(cp);
908
909 return cp;
910 }
911
912 /*
913 * /proc/net/ip_vs_conn entries
914 */
915 #ifdef CONFIG_PROC_FS
916 struct ip_vs_iter_state {
917 struct seq_net_private p;
918 struct hlist_head *l;
919 };
920
921 static void *ip_vs_conn_array(struct seq_file *seq, loff_t pos)
922 {
923 int idx;
924 struct ip_vs_conn *cp;
925 struct ip_vs_iter_state *iter = seq->private;
926 struct hlist_node *n;
927
928 for (idx = 0; idx < ip_vs_conn_tab_size; idx++) {
929 ct_read_lock_bh(idx);
930 hlist_for_each_entry(cp, n, &ip_vs_conn_tab[idx], c_list) {
931 if (pos-- == 0) {
932 iter->l = &ip_vs_conn_tab[idx];
933 return cp;
934 }
935 }
936 ct_read_unlock_bh(idx);
937 }
938
939 return NULL;
940 }
941
942 static void *ip_vs_conn_seq_start(struct seq_file *seq, loff_t *pos)
943 {
944 struct ip_vs_iter_state *iter = seq->private;
945
946 iter->l = NULL;
947 return *pos ? ip_vs_conn_array(seq, *pos - 1) :SEQ_START_TOKEN;
948 }
949
950 static void *ip_vs_conn_seq_next(struct seq_file *seq, void *v, loff_t *pos)
951 {
952 struct ip_vs_conn *cp = v;
953 struct ip_vs_iter_state *iter = seq->private;
954 struct hlist_node *e;
955 struct hlist_head *l = iter->l;
956 int idx;
957
958 ++*pos;
959 if (v == SEQ_START_TOKEN)
960 return ip_vs_conn_array(seq, 0);
961
962 /* more on same hash chain? */
963 if ((e = cp->c_list.next))
964 return hlist_entry(e, struct ip_vs_conn, c_list);
965
966 idx = l - ip_vs_conn_tab;
967 ct_read_unlock_bh(idx);
968
969 while (++idx < ip_vs_conn_tab_size) {
970 ct_read_lock_bh(idx);
971 hlist_for_each_entry(cp, e, &ip_vs_conn_tab[idx], c_list) {
972 iter->l = &ip_vs_conn_tab[idx];
973 return cp;
974 }
975 ct_read_unlock_bh(idx);
976 }
977 iter->l = NULL;
978 return NULL;
979 }
980
981 static void ip_vs_conn_seq_stop(struct seq_file *seq, void *v)
982 {
983 struct ip_vs_iter_state *iter = seq->private;
984 struct hlist_head *l = iter->l;
985
986 if (l)
987 ct_read_unlock_bh(l - ip_vs_conn_tab);
988 }
989
990 static int ip_vs_conn_seq_show(struct seq_file *seq, void *v)
991 {
992
993 if (v == SEQ_START_TOKEN)
994 seq_puts(seq,
995 "Pro FromIP FPrt ToIP TPrt DestIP DPrt State Expires PEName PEData\n");
996 else {
997 const struct ip_vs_conn *cp = v;
998 struct net *net = seq_file_net(seq);
999 char pe_data[IP_VS_PENAME_MAXLEN + IP_VS_PEDATA_MAXLEN + 3];
1000 size_t len = 0;
1001
1002 if (!ip_vs_conn_net_eq(cp, net))
1003 return 0;
1004 if (cp->pe_data) {
1005 pe_data[0] = ' ';
1006 len = strlen(cp->pe->name);
1007 memcpy(pe_data + 1, cp->pe->name, len);
1008 pe_data[len + 1] = ' ';
1009 len += 2;
1010 len += cp->pe->show_pe_data(cp, pe_data + len);
1011 }
1012 pe_data[len] = '\0';
1013
1014 #ifdef CONFIG_IP_VS_IPV6
1015 if (cp->af == AF_INET6)
1016 seq_printf(seq, "%-3s %pI6 %04X %pI6 %04X "
1017 "%pI6 %04X %-11s %7lu%s\n",
1018 ip_vs_proto_name(cp->protocol),
1019 &cp->caddr.in6, ntohs(cp->cport),
1020 &cp->vaddr.in6, ntohs(cp->vport),
1021 &cp->daddr.in6, ntohs(cp->dport),
1022 ip_vs_state_name(cp->protocol, cp->state),
1023 (cp->timer.expires-jiffies)/HZ, pe_data);
1024 else
1025 #endif
1026 seq_printf(seq,
1027 "%-3s %08X %04X %08X %04X"
1028 " %08X %04X %-11s %7lu%s\n",
1029 ip_vs_proto_name(cp->protocol),
1030 ntohl(cp->caddr.ip), ntohs(cp->cport),
1031 ntohl(cp->vaddr.ip), ntohs(cp->vport),
1032 ntohl(cp->daddr.ip), ntohs(cp->dport),
1033 ip_vs_state_name(cp->protocol, cp->state),
1034 (cp->timer.expires-jiffies)/HZ, pe_data);
1035 }
1036 return 0;
1037 }
1038
1039 static const struct seq_operations ip_vs_conn_seq_ops = {
1040 .start = ip_vs_conn_seq_start,
1041 .next = ip_vs_conn_seq_next,
1042 .stop = ip_vs_conn_seq_stop,
1043 .show = ip_vs_conn_seq_show,
1044 };
1045
1046 static int ip_vs_conn_open(struct inode *inode, struct file *file)
1047 {
1048 return seq_open_net(inode, file, &ip_vs_conn_seq_ops,
1049 sizeof(struct ip_vs_iter_state));
1050 }
1051
1052 static const struct file_operations ip_vs_conn_fops = {
1053 .owner = THIS_MODULE,
1054 .open = ip_vs_conn_open,
1055 .read = seq_read,
1056 .llseek = seq_lseek,
1057 .release = seq_release_net,
1058 };
1059
1060 static const char *ip_vs_origin_name(unsigned flags)
1061 {
1062 if (flags & IP_VS_CONN_F_SYNC)
1063 return "SYNC";
1064 else
1065 return "LOCAL";
1066 }
1067
1068 static int ip_vs_conn_sync_seq_show(struct seq_file *seq, void *v)
1069 {
1070
1071 if (v == SEQ_START_TOKEN)
1072 seq_puts(seq,
1073 "Pro FromIP FPrt ToIP TPrt DestIP DPrt State Origin Expires\n");
1074 else {
1075 const struct ip_vs_conn *cp = v;
1076 struct net *net = seq_file_net(seq);
1077
1078 if (!ip_vs_conn_net_eq(cp, net))
1079 return 0;
1080
1081 #ifdef CONFIG_IP_VS_IPV6
1082 if (cp->af == AF_INET6)
1083 seq_printf(seq, "%-3s %pI6 %04X %pI6 %04X %pI6 %04X %-11s %-6s %7lu\n",
1084 ip_vs_proto_name(cp->protocol),
1085 &cp->caddr.in6, ntohs(cp->cport),
1086 &cp->vaddr.in6, ntohs(cp->vport),
1087 &cp->daddr.in6, ntohs(cp->dport),
1088 ip_vs_state_name(cp->protocol, cp->state),
1089 ip_vs_origin_name(cp->flags),
1090 (cp->timer.expires-jiffies)/HZ);
1091 else
1092 #endif
1093 seq_printf(seq,
1094 "%-3s %08X %04X %08X %04X "
1095 "%08X %04X %-11s %-6s %7lu\n",
1096 ip_vs_proto_name(cp->protocol),
1097 ntohl(cp->caddr.ip), ntohs(cp->cport),
1098 ntohl(cp->vaddr.ip), ntohs(cp->vport),
1099 ntohl(cp->daddr.ip), ntohs(cp->dport),
1100 ip_vs_state_name(cp->protocol, cp->state),
1101 ip_vs_origin_name(cp->flags),
1102 (cp->timer.expires-jiffies)/HZ);
1103 }
1104 return 0;
1105 }
1106
1107 static const struct seq_operations ip_vs_conn_sync_seq_ops = {
1108 .start = ip_vs_conn_seq_start,
1109 .next = ip_vs_conn_seq_next,
1110 .stop = ip_vs_conn_seq_stop,
1111 .show = ip_vs_conn_sync_seq_show,
1112 };
1113
1114 static int ip_vs_conn_sync_open(struct inode *inode, struct file *file)
1115 {
1116 return seq_open_net(inode, file, &ip_vs_conn_sync_seq_ops,
1117 sizeof(struct ip_vs_iter_state));
1118 }
1119
1120 static const struct file_operations ip_vs_conn_sync_fops = {
1121 .owner = THIS_MODULE,
1122 .open = ip_vs_conn_sync_open,
1123 .read = seq_read,
1124 .llseek = seq_lseek,
1125 .release = seq_release_net,
1126 };
1127
1128 #endif
1129
1130
1131 /*
1132 * Randomly drop connection entries before running out of memory
1133 */
1134 static inline int todrop_entry(struct ip_vs_conn *cp)
1135 {
1136 /*
1137 * The drop rate array needs tuning for real environments.
1138 * Called from timer bh only => no locking
1139 */
1140 static const char todrop_rate[9] = {0, 1, 2, 3, 4, 5, 6, 7, 8};
1141 static char todrop_counter[9] = {0};
1142 int i;
1143
1144 /* if the conn entry hasn't lasted for 60 seconds, don't drop it.
1145 This will leave enough time for normal connection to get
1146 through. */
1147 if (time_before(cp->timeout + jiffies, cp->timer.expires + 60*HZ))
1148 return 0;
1149
1150 /* Don't drop the entry if its number of incoming packets is not
1151 located in [0, 8] */
1152 i = atomic_read(&cp->in_pkts);
1153 if (i > 8 || i < 0) return 0;
1154
1155 if (!todrop_rate[i]) return 0;
1156 if (--todrop_counter[i] > 0) return 0;
1157
1158 todrop_counter[i] = todrop_rate[i];
1159 return 1;
1160 }
1161
1162 /* Called from keventd and must protect itself from softirqs */
1163 void ip_vs_random_dropentry(struct net *net)
1164 {
1165 int idx;
1166 struct ip_vs_conn *cp;
1167
1168 /*
1169 * Randomly scan 1/32 of the whole table every second
1170 */
1171 for (idx = 0; idx < (ip_vs_conn_tab_size>>5); idx++) {
1172 unsigned hash = net_random() & ip_vs_conn_tab_mask;
1173 struct hlist_node *n;
1174
1175 /*
1176 * Lock is actually needed in this loop.
1177 */
1178 ct_write_lock_bh(hash);
1179
1180 hlist_for_each_entry(cp, n, &ip_vs_conn_tab[hash], c_list) {
1181 if (cp->flags & IP_VS_CONN_F_TEMPLATE)
1182 /* connection template */
1183 continue;
1184 if (!ip_vs_conn_net_eq(cp, net))
1185 continue;
1186 if (cp->protocol == IPPROTO_TCP) {
1187 switch(cp->state) {
1188 case IP_VS_TCP_S_SYN_RECV:
1189 case IP_VS_TCP_S_SYNACK:
1190 break;
1191
1192 case IP_VS_TCP_S_ESTABLISHED:
1193 if (todrop_entry(cp))
1194 break;
1195 continue;
1196
1197 default:
1198 continue;
1199 }
1200 } else {
1201 if (!todrop_entry(cp))
1202 continue;
1203 }
1204
1205 IP_VS_DBG(4, "del connection\n");
1206 ip_vs_conn_expire_now(cp);
1207 if (cp->control) {
1208 IP_VS_DBG(4, "del conn template\n");
1209 ip_vs_conn_expire_now(cp->control);
1210 }
1211 }
1212 ct_write_unlock_bh(hash);
1213 }
1214 }
1215
1216
1217 /*
1218 * Flush all the connection entries in the ip_vs_conn_tab
1219 */
1220 static void ip_vs_conn_flush(struct net *net)
1221 {
1222 int idx;
1223 struct ip_vs_conn *cp;
1224 struct netns_ipvs *ipvs = net_ipvs(net);
1225
1226 flush_again:
1227 for (idx = 0; idx < ip_vs_conn_tab_size; idx++) {
1228 struct hlist_node *n;
1229
1230 /*
1231 * Lock is actually needed in this loop.
1232 */
1233 ct_write_lock_bh(idx);
1234
1235 hlist_for_each_entry(cp, n, &ip_vs_conn_tab[idx], c_list) {
1236 if (!ip_vs_conn_net_eq(cp, net))
1237 continue;
1238 IP_VS_DBG(4, "del connection\n");
1239 ip_vs_conn_expire_now(cp);
1240 if (cp->control) {
1241 IP_VS_DBG(4, "del conn template\n");
1242 ip_vs_conn_expire_now(cp->control);
1243 }
1244 }
1245 ct_write_unlock_bh(idx);
1246 }
1247
1248 /* the counter may be not NULL, because maybe some conn entries
1249 are run by slow timer handler or unhashed but still referred */
1250 if (atomic_read(&ipvs->conn_count) != 0) {
1251 schedule();
1252 goto flush_again;
1253 }
1254 }
1255 /*
1256 * per netns init and exit
1257 */
1258 int __net_init ip_vs_conn_net_init(struct net *net)
1259 {
1260 struct netns_ipvs *ipvs = net_ipvs(net);
1261
1262 atomic_set(&ipvs->conn_count, 0);
1263
1264 proc_net_fops_create(net, "ip_vs_conn", 0, &ip_vs_conn_fops);
1265 proc_net_fops_create(net, "ip_vs_conn_sync", 0, &ip_vs_conn_sync_fops);
1266 return 0;
1267 }
1268
1269 void __net_exit ip_vs_conn_net_cleanup(struct net *net)
1270 {
1271 /* flush all the connection entries first */
1272 ip_vs_conn_flush(net);
1273 proc_net_remove(net, "ip_vs_conn");
1274 proc_net_remove(net, "ip_vs_conn_sync");
1275 }
1276
1277 int __init ip_vs_conn_init(void)
1278 {
1279 int idx;
1280
1281 /* Compute size and mask */
1282 ip_vs_conn_tab_size = 1 << ip_vs_conn_tab_bits;
1283 ip_vs_conn_tab_mask = ip_vs_conn_tab_size - 1;
1284
1285 /*
1286 * Allocate the connection hash table and initialize its list heads
1287 */
1288 ip_vs_conn_tab = vmalloc(ip_vs_conn_tab_size * sizeof(*ip_vs_conn_tab));
1289 if (!ip_vs_conn_tab)
1290 return -ENOMEM;
1291
1292 /* Allocate ip_vs_conn slab cache */
1293 ip_vs_conn_cachep = kmem_cache_create("ip_vs_conn",
1294 sizeof(struct ip_vs_conn), 0,
1295 SLAB_HWCACHE_ALIGN, NULL);
1296 if (!ip_vs_conn_cachep) {
1297 vfree(ip_vs_conn_tab);
1298 return -ENOMEM;
1299 }
1300
1301 pr_info("Connection hash table configured "
1302 "(size=%d, memory=%ldKbytes)\n",
1303 ip_vs_conn_tab_size,
1304 (long)(ip_vs_conn_tab_size*sizeof(struct list_head))/1024);
1305 IP_VS_DBG(0, "Each connection entry needs %Zd bytes at least\n",
1306 sizeof(struct ip_vs_conn));
1307
1308 for (idx = 0; idx < ip_vs_conn_tab_size; idx++)
1309 INIT_HLIST_HEAD(&ip_vs_conn_tab[idx]);
1310
1311 for (idx = 0; idx < CT_LOCKARRAY_SIZE; idx++) {
1312 rwlock_init(&__ip_vs_conntbl_lock_array[idx].l);
1313 }
1314
1315 /* calculate the random value for connection hash */
1316 get_random_bytes(&ip_vs_conn_rnd, sizeof(ip_vs_conn_rnd));
1317
1318 return 0;
1319 }
1320
1321 void ip_vs_conn_cleanup(void)
1322 {
1323 /* Release the empty cache */
1324 kmem_cache_destroy(ip_vs_conn_cachep);
1325 vfree(ip_vs_conn_tab);
1326 }
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