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dmaengine: at_hdmac: pause: no need to wait for FIFO empty
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / netfilter / ipvs / ip_vs_conn.c
blobf289306cbf12aa22970ba62646ed501d38ca93b1
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 peristent 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);
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 peristent 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
782 ip_vs_pe_put(cp->pe);
783 kfree(cp->pe_data);
784 if (unlikely(cp->app != NULL))
785 ip_vs_unbind_app(cp);
786 ip_vs_unbind_dest(cp);
787 if (cp->flags & IP_VS_CONN_F_NO_CPORT)
788 atomic_dec(&ip_vs_conn_no_cport_cnt);
789 atomic_dec(&ipvs->conn_count);
790
791 kmem_cache_free(ip_vs_conn_cachep, cp);
792 return;
793 }
794
795 /* hash it back to the table */
796 ip_vs_conn_hash(cp);
797
798 expire_later:
799 IP_VS_DBG(7, "delayed: conn->refcnt-1=%d conn->n_control=%d\n",
800 atomic_read(&cp->refcnt)-1,
801 atomic_read(&cp->n_control));
802
803 ip_vs_conn_put(cp);
804 }
805
806
807 void ip_vs_conn_expire_now(struct ip_vs_conn *cp)
808 {
809 if (del_timer(&cp->timer))
810 mod_timer(&cp->timer, jiffies);
811 }
812
813
814 /*
815 * Create a new connection entry and hash it into the ip_vs_conn_tab
816 */
817 struct ip_vs_conn *
818 ip_vs_conn_new(const struct ip_vs_conn_param *p,
819 const union nf_inet_addr *daddr, __be16 dport, unsigned flags,
820 struct ip_vs_dest *dest, __u32 fwmark)
821 {
822 struct ip_vs_conn *cp;
823 struct netns_ipvs *ipvs = net_ipvs(p->net);
824 struct ip_vs_proto_data *pd = ip_vs_proto_data_get(p->net,
825 p->protocol);
826
827 cp = kmem_cache_zalloc(ip_vs_conn_cachep, GFP_ATOMIC);
828 if (cp == NULL) {
829 IP_VS_ERR_RL("%s(): no memory\n", __func__);
830 return NULL;
831 }
832
833 INIT_HLIST_NODE(&cp->c_list);
834 setup_timer(&cp->timer, ip_vs_conn_expire, (unsigned long)cp);
835 ip_vs_conn_net_set(cp, p->net);
836 cp->af = p->af;
837 cp->protocol = p->protocol;
838 ip_vs_addr_copy(p->af, &cp->caddr, p->caddr);
839 cp->cport = p->cport;
840 ip_vs_addr_copy(p->af, &cp->vaddr, p->vaddr);
841 cp->vport = p->vport;
842 /* proto should only be IPPROTO_IP if d_addr is a fwmark */
843 ip_vs_addr_copy(p->protocol == IPPROTO_IP ? AF_UNSPEC : p->af,
844 &cp->daddr, daddr);
845 cp->dport = dport;
846 cp->flags = flags;
847 cp->fwmark = fwmark;
848 if (flags & IP_VS_CONN_F_TEMPLATE && p->pe) {
849 ip_vs_pe_get(p->pe);
850 cp->pe = p->pe;
851 cp->pe_data = p->pe_data;
852 cp->pe_data_len = p->pe_data_len;
853 }
854 spin_lock_init(&cp->lock);
855
856 /*
857 * Set the entry is referenced by the current thread before hashing
858 * it in the table, so that other thread run ip_vs_random_dropentry
859 * but cannot drop this entry.
860 */
861 atomic_set(&cp->refcnt, 1);
862
863 atomic_set(&cp->n_control, 0);
864 atomic_set(&cp->in_pkts, 0);
865
866 atomic_inc(&ipvs->conn_count);
867 if (flags & IP_VS_CONN_F_NO_CPORT)
868 atomic_inc(&ip_vs_conn_no_cport_cnt);
869
870 /* Bind the connection with a destination server */
871 ip_vs_bind_dest(cp, dest);
872
873 /* Set its state and timeout */
874 cp->state = 0;
875 cp->timeout = 3*HZ;
876
877 /* Bind its packet transmitter */
878 #ifdef CONFIG_IP_VS_IPV6
879 if (p->af == AF_INET6)
880 ip_vs_bind_xmit_v6(cp);
881 else
882 #endif
883 ip_vs_bind_xmit(cp);
884
885 if (unlikely(pd && atomic_read(&pd->appcnt)))
886 ip_vs_bind_app(cp, pd->pp);
887
888 /*
889 * Allow conntrack to be preserved. By default, conntrack
890 * is created and destroyed for every packet.
891 * Sometimes keeping conntrack can be useful for
892 * IP_VS_CONN_F_ONE_PACKET too.
893 */
894
895 if (ip_vs_conntrack_enabled(ipvs))
896 cp->flags |= IP_VS_CONN_F_NFCT;
897
898 /* Hash it in the ip_vs_conn_tab finally */
899 ip_vs_conn_hash(cp);
900
901 return cp;
902 }
903
904 /*
905 * /proc/net/ip_vs_conn entries
906 */
907 #ifdef CONFIG_PROC_FS
908 struct ip_vs_iter_state {
909 struct seq_net_private p;
910 struct hlist_head *l;
911 };
912
913 static void *ip_vs_conn_array(struct seq_file *seq, loff_t pos)
914 {
915 int idx;
916 struct ip_vs_conn *cp;
917 struct ip_vs_iter_state *iter = seq->private;
918 struct hlist_node *n;
919
920 for (idx = 0; idx < ip_vs_conn_tab_size; idx++) {
921 ct_read_lock_bh(idx);
922 hlist_for_each_entry(cp, n, &ip_vs_conn_tab[idx], c_list) {
923 if (pos-- == 0) {
924 iter->l = &ip_vs_conn_tab[idx];
925 return cp;
926 }
927 }
928 ct_read_unlock_bh(idx);
929 }
930
931 return NULL;
932 }
933
934 static void *ip_vs_conn_seq_start(struct seq_file *seq, loff_t *pos)
935 {
936 struct ip_vs_iter_state *iter = seq->private;
937
938 iter->l = NULL;
939 return *pos ? ip_vs_conn_array(seq, *pos - 1) :SEQ_START_TOKEN;
940 }
941
942 static void *ip_vs_conn_seq_next(struct seq_file *seq, void *v, loff_t *pos)
943 {
944 struct ip_vs_conn *cp = v;
945 struct ip_vs_iter_state *iter = seq->private;
946 struct hlist_node *e;
947 struct hlist_head *l = iter->l;
948 int idx;
949
950 ++*pos;
951 if (v == SEQ_START_TOKEN)
952 return ip_vs_conn_array(seq, 0);
953
954 /* more on same hash chain? */
955 if ((e = cp->c_list.next))
956 return hlist_entry(e, struct ip_vs_conn, c_list);
957
958 idx = l - ip_vs_conn_tab;
959 ct_read_unlock_bh(idx);
960
961 while (++idx < ip_vs_conn_tab_size) {
962 ct_read_lock_bh(idx);
963 hlist_for_each_entry(cp, e, &ip_vs_conn_tab[idx], c_list) {
964 iter->l = &ip_vs_conn_tab[idx];
965 return cp;
966 }
967 ct_read_unlock_bh(idx);
968 }
969 iter->l = NULL;
970 return NULL;
971 }
972
973 static void ip_vs_conn_seq_stop(struct seq_file *seq, void *v)
974 {
975 struct ip_vs_iter_state *iter = seq->private;
976 struct hlist_head *l = iter->l;
977
978 if (l)
979 ct_read_unlock_bh(l - ip_vs_conn_tab);
980 }
981
982 static int ip_vs_conn_seq_show(struct seq_file *seq, void *v)
983 {
984
985 if (v == SEQ_START_TOKEN)
986 seq_puts(seq,
987 "Pro FromIP FPrt ToIP TPrt DestIP DPrt State Expires PEName PEData\n");
988 else {
989 const struct ip_vs_conn *cp = v;
990 struct net *net = seq_file_net(seq);
991 char pe_data[IP_VS_PENAME_MAXLEN + IP_VS_PEDATA_MAXLEN + 3];
992 size_t len = 0;
993
994 if (!ip_vs_conn_net_eq(cp, net))
995 return 0;
996 if (cp->pe_data) {
997 pe_data[0] = ' ';
998 len = strlen(cp->pe->name);
999 memcpy(pe_data + 1, cp->pe->name, len);
1000 pe_data[len + 1] = ' ';
1001 len += 2;
1002 len += cp->pe->show_pe_data(cp, pe_data + len);
1003 }
1004 pe_data[len] = '\0';
1005
1006 #ifdef CONFIG_IP_VS_IPV6
1007 if (cp->af == AF_INET6)
1008 seq_printf(seq, "%-3s %pI6 %04X %pI6 %04X "
1009 "%pI6 %04X %-11s %7lu%s\n",
1010 ip_vs_proto_name(cp->protocol),
1011 &cp->caddr.in6, ntohs(cp->cport),
1012 &cp->vaddr.in6, ntohs(cp->vport),
1013 &cp->daddr.in6, ntohs(cp->dport),
1014 ip_vs_state_name(cp->protocol, cp->state),
1015 (cp->timer.expires-jiffies)/HZ, pe_data);
1016 else
1017 #endif
1018 seq_printf(seq,
1019 "%-3s %08X %04X %08X %04X"
1020 " %08X %04X %-11s %7lu%s\n",
1021 ip_vs_proto_name(cp->protocol),
1022 ntohl(cp->caddr.ip), ntohs(cp->cport),
1023 ntohl(cp->vaddr.ip), ntohs(cp->vport),
1024 ntohl(cp->daddr.ip), ntohs(cp->dport),
1025 ip_vs_state_name(cp->protocol, cp->state),
1026 (cp->timer.expires-jiffies)/HZ, pe_data);
1027 }
1028 return 0;
1029 }
1030
1031 static const struct seq_operations ip_vs_conn_seq_ops = {
1032 .start = ip_vs_conn_seq_start,
1033 .next = ip_vs_conn_seq_next,
1034 .stop = ip_vs_conn_seq_stop,
1035 .show = ip_vs_conn_seq_show,
1036 };
1037
1038 static int ip_vs_conn_open(struct inode *inode, struct file *file)
1039 {
1040 return seq_open_net(inode, file, &ip_vs_conn_seq_ops,
1041 sizeof(struct ip_vs_iter_state));
1042 }
1043
1044 static const struct file_operations ip_vs_conn_fops = {
1045 .owner = THIS_MODULE,
1046 .open = ip_vs_conn_open,
1047 .read = seq_read,
1048 .llseek = seq_lseek,
1049 .release = seq_release,
1050 };
1051
1052 static const char *ip_vs_origin_name(unsigned flags)
1053 {
1054 if (flags & IP_VS_CONN_F_SYNC)
1055 return "SYNC";
1056 else
1057 return "LOCAL";
1058 }
1059
1060 static int ip_vs_conn_sync_seq_show(struct seq_file *seq, void *v)
1061 {
1062
1063 if (v == SEQ_START_TOKEN)
1064 seq_puts(seq,
1065 "Pro FromIP FPrt ToIP TPrt DestIP DPrt State Origin Expires\n");
1066 else {
1067 const struct ip_vs_conn *cp = v;
1068 struct net *net = seq_file_net(seq);
1069
1070 if (!ip_vs_conn_net_eq(cp, net))
1071 return 0;
1072
1073 #ifdef CONFIG_IP_VS_IPV6
1074 if (cp->af == AF_INET6)
1075 seq_printf(seq, "%-3s %pI6 %04X %pI6 %04X %pI6 %04X %-11s %-6s %7lu\n",
1076 ip_vs_proto_name(cp->protocol),
1077 &cp->caddr.in6, ntohs(cp->cport),
1078 &cp->vaddr.in6, ntohs(cp->vport),
1079 &cp->daddr.in6, ntohs(cp->dport),
1080 ip_vs_state_name(cp->protocol, cp->state),
1081 ip_vs_origin_name(cp->flags),
1082 (cp->timer.expires-jiffies)/HZ);
1083 else
1084 #endif
1085 seq_printf(seq,
1086 "%-3s %08X %04X %08X %04X "
1087 "%08X %04X %-11s %-6s %7lu\n",
1088 ip_vs_proto_name(cp->protocol),
1089 ntohl(cp->caddr.ip), ntohs(cp->cport),
1090 ntohl(cp->vaddr.ip), ntohs(cp->vport),
1091 ntohl(cp->daddr.ip), ntohs(cp->dport),
1092 ip_vs_state_name(cp->protocol, cp->state),
1093 ip_vs_origin_name(cp->flags),
1094 (cp->timer.expires-jiffies)/HZ);
1095 }
1096 return 0;
1097 }
1098
1099 static const struct seq_operations ip_vs_conn_sync_seq_ops = {
1100 .start = ip_vs_conn_seq_start,
1101 .next = ip_vs_conn_seq_next,
1102 .stop = ip_vs_conn_seq_stop,
1103 .show = ip_vs_conn_sync_seq_show,
1104 };
1105
1106 static int ip_vs_conn_sync_open(struct inode *inode, struct file *file)
1107 {
1108 return seq_open_net(inode, file, &ip_vs_conn_sync_seq_ops,
1109 sizeof(struct ip_vs_iter_state));
1110 }
1111
1112 static const struct file_operations ip_vs_conn_sync_fops = {
1113 .owner = THIS_MODULE,
1114 .open = ip_vs_conn_sync_open,
1115 .read = seq_read,
1116 .llseek = seq_lseek,
1117 .release = seq_release,
1118 };
1119
1120 #endif
1121
1122
1123 /*
1124 * Randomly drop connection entries before running out of memory
1125 */
1126 static inline int todrop_entry(struct ip_vs_conn *cp)
1127 {
1128 /*
1129 * The drop rate array needs tuning for real environments.
1130 * Called from timer bh only => no locking
1131 */
1132 static const char todrop_rate[9] = {0, 1, 2, 3, 4, 5, 6, 7, 8};
1133 static char todrop_counter[9] = {0};
1134 int i;
1135
1136 /* if the conn entry hasn't lasted for 60 seconds, don't drop it.
1137 This will leave enough time for normal connection to get
1138 through. */
1139 if (time_before(cp->timeout + jiffies, cp->timer.expires + 60*HZ))
1140 return 0;
1141
1142 /* Don't drop the entry if its number of incoming packets is not
1143 located in [0, 8] */
1144 i = atomic_read(&cp->in_pkts);
1145 if (i > 8 || i < 0) return 0;
1146
1147 if (!todrop_rate[i]) return 0;
1148 if (--todrop_counter[i] > 0) return 0;
1149
1150 todrop_counter[i] = todrop_rate[i];
1151 return 1;
1152 }
1153
1154 /* Called from keventd and must protect itself from softirqs */
1155 void ip_vs_random_dropentry(struct net *net)
1156 {
1157 int idx;
1158 struct ip_vs_conn *cp;
1159
1160 /*
1161 * Randomly scan 1/32 of the whole table every second
1162 */
1163 for (idx = 0; idx < (ip_vs_conn_tab_size>>5); idx++) {
1164 unsigned hash = net_random() & ip_vs_conn_tab_mask;
1165 struct hlist_node *n;
1166
1167 /*
1168 * Lock is actually needed in this loop.
1169 */
1170 ct_write_lock_bh(hash);
1171
1172 hlist_for_each_entry(cp, n, &ip_vs_conn_tab[hash], c_list) {
1173 if (cp->flags & IP_VS_CONN_F_TEMPLATE)
1174 /* connection template */
1175 continue;
1176 if (!ip_vs_conn_net_eq(cp, net))
1177 continue;
1178 if (cp->protocol == IPPROTO_TCP) {
1179 switch(cp->state) {
1180 case IP_VS_TCP_S_SYN_RECV:
1181 case IP_VS_TCP_S_SYNACK:
1182 break;
1183
1184 case IP_VS_TCP_S_ESTABLISHED:
1185 if (todrop_entry(cp))
1186 break;
1187 continue;
1188
1189 default:
1190 continue;
1191 }
1192 } else {
1193 if (!todrop_entry(cp))
1194 continue;
1195 }
1196
1197 IP_VS_DBG(4, "del connection\n");
1198 ip_vs_conn_expire_now(cp);
1199 if (cp->control) {
1200 IP_VS_DBG(4, "del conn template\n");
1201 ip_vs_conn_expire_now(cp->control);
1202 }
1203 }
1204 ct_write_unlock_bh(hash);
1205 }
1206 }
1207
1208
1209 /*
1210 * Flush all the connection entries in the ip_vs_conn_tab
1211 */
1212 static void ip_vs_conn_flush(struct net *net)
1213 {
1214 int idx;
1215 struct ip_vs_conn *cp;
1216 struct netns_ipvs *ipvs = net_ipvs(net);
1217
1218 flush_again:
1219 for (idx = 0; idx < ip_vs_conn_tab_size; idx++) {
1220 struct hlist_node *n;
1221
1222 /*
1223 * Lock is actually needed in this loop.
1224 */
1225 ct_write_lock_bh(idx);
1226
1227 hlist_for_each_entry(cp, n, &ip_vs_conn_tab[idx], c_list) {
1228 if (!ip_vs_conn_net_eq(cp, net))
1229 continue;
1230 IP_VS_DBG(4, "del connection\n");
1231 ip_vs_conn_expire_now(cp);
1232 if (cp->control) {
1233 IP_VS_DBG(4, "del conn template\n");
1234 ip_vs_conn_expire_now(cp->control);
1235 }
1236 }
1237 ct_write_unlock_bh(idx);
1238 }
1239
1240 /* the counter may be not NULL, because maybe some conn entries
1241 are run by slow timer handler or unhashed but still referred */
1242 if (atomic_read(&ipvs->conn_count) != 0) {
1243 schedule();
1244 goto flush_again;
1245 }
1246 }
1247 /*
1248 * per netns init and exit
1249 */
1250 int __net_init __ip_vs_conn_init(struct net *net)
1251 {
1252 struct netns_ipvs *ipvs = net_ipvs(net);
1253
1254 atomic_set(&ipvs->conn_count, 0);
1255
1256 proc_net_fops_create(net, "ip_vs_conn", 0, &ip_vs_conn_fops);
1257 proc_net_fops_create(net, "ip_vs_conn_sync", 0, &ip_vs_conn_sync_fops);
1258 return 0;
1259 }
1260
1261 static void __net_exit __ip_vs_conn_cleanup(struct net *net)
1262 {
1263 /* flush all the connection entries first */
1264 ip_vs_conn_flush(net);
1265 proc_net_remove(net, "ip_vs_conn");
1266 proc_net_remove(net, "ip_vs_conn_sync");
1267 }
1268 static struct pernet_operations ipvs_conn_ops = {
1269 .init = __ip_vs_conn_init,
1270 .exit = __ip_vs_conn_cleanup,
1271 };
1272
1273 int __init ip_vs_conn_init(void)
1274 {
1275 int idx;
1276 int retc;
1277
1278 /* Compute size and mask */
1279 ip_vs_conn_tab_size = 1 << ip_vs_conn_tab_bits;
1280 ip_vs_conn_tab_mask = ip_vs_conn_tab_size - 1;
1281
1282 /*
1283 * Allocate the connection hash table and initialize its list heads
1284 */
1285 ip_vs_conn_tab = vmalloc(ip_vs_conn_tab_size * sizeof(*ip_vs_conn_tab));
1286 if (!ip_vs_conn_tab)
1287 return -ENOMEM;
1288
1289 /* Allocate ip_vs_conn slab cache */
1290 ip_vs_conn_cachep = kmem_cache_create("ip_vs_conn",
1291 sizeof(struct ip_vs_conn), 0,
1292 SLAB_HWCACHE_ALIGN, NULL);
1293 if (!ip_vs_conn_cachep) {
1294 vfree(ip_vs_conn_tab);
1295 return -ENOMEM;
1296 }
1297
1298 pr_info("Connection hash table configured "
1299 "(size=%d, memory=%ldKbytes)\n",
1300 ip_vs_conn_tab_size,
1301 (long)(ip_vs_conn_tab_size*sizeof(struct list_head))/1024);
1302 IP_VS_DBG(0, "Each connection entry needs %Zd bytes at least\n",
1303 sizeof(struct ip_vs_conn));
1304
1305 for (idx = 0; idx < ip_vs_conn_tab_size; idx++)
1306 INIT_HLIST_HEAD(&ip_vs_conn_tab[idx]);
1307
1308 for (idx = 0; idx < CT_LOCKARRAY_SIZE; idx++) {
1309 rwlock_init(&__ip_vs_conntbl_lock_array[idx].l);
1310 }
1311
1312 retc = register_pernet_subsys(&ipvs_conn_ops);
1313
1314 /* calculate the random value for connection hash */
1315 get_random_bytes(&ip_vs_conn_rnd, sizeof(ip_vs_conn_rnd));
1316
1317 return retc;
1318 }
1319
1320 void ip_vs_conn_cleanup(void)
1321 {
1322 unregister_pernet_subsys(&ipvs_conn_ops);
1323 /* Release the empty cache */
1324 kmem_cache_destroy(ip_vs_conn_cachep);
1325 vfree(ip_vs_conn_tab);
1326 }
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree