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Merge tag 'gpio-v3.13-3' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw...
[linux-2.6.git] / net / netfilter / ipvs / ip_vs_conn.c
blob4c8e5c0aa1aba96b03fae69ce153056a10bb7b95
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 spinlock_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_write_lock_bh(unsigned int key)
90 {
91 spin_lock_bh(&__ip_vs_conntbl_lock_array[key&CT_LOCKARRAY_MASK].l);
92 }
93
94 static inline void ct_write_unlock_bh(unsigned int key)
95 {
96 spin_unlock_bh(&__ip_vs_conntbl_lock_array[key&CT_LOCKARRAY_MASK].l);
97 }
98
99
100 /*
101 * Returns hash value for IPVS connection entry
102 */
103 static unsigned int ip_vs_conn_hashkey(struct net *net, int af, unsigned int proto,
104 const union nf_inet_addr *addr,
105 __be16 port)
106 {
107 #ifdef CONFIG_IP_VS_IPV6
108 if (af == AF_INET6)
109 return (jhash_3words(jhash(addr, 16, ip_vs_conn_rnd),
110 (__force u32)port, proto, ip_vs_conn_rnd) ^
111 ((size_t)net>>8)) & ip_vs_conn_tab_mask;
112 #endif
113 return (jhash_3words((__force u32)addr->ip, (__force u32)port, proto,
114 ip_vs_conn_rnd) ^
115 ((size_t)net>>8)) & ip_vs_conn_tab_mask;
116 }
117
118 static unsigned int ip_vs_conn_hashkey_param(const struct ip_vs_conn_param *p,
119 bool inverse)
120 {
121 const union nf_inet_addr *addr;
122 __be16 port;
123
124 if (p->pe_data && p->pe->hashkey_raw)
125 return p->pe->hashkey_raw(p, ip_vs_conn_rnd, inverse) &
126 ip_vs_conn_tab_mask;
127
128 if (likely(!inverse)) {
129 addr = p->caddr;
130 port = p->cport;
131 } else {
132 addr = p->vaddr;
133 port = p->vport;
134 }
135
136 return ip_vs_conn_hashkey(p->net, p->af, p->protocol, addr, port);
137 }
138
139 static unsigned int ip_vs_conn_hashkey_conn(const struct ip_vs_conn *cp)
140 {
141 struct ip_vs_conn_param p;
142
143 ip_vs_conn_fill_param(ip_vs_conn_net(cp), cp->af, cp->protocol,
144 &cp->caddr, cp->cport, NULL, 0, &p);
145
146 if (cp->pe) {
147 p.pe = cp->pe;
148 p.pe_data = cp->pe_data;
149 p.pe_data_len = cp->pe_data_len;
150 }
151
152 return ip_vs_conn_hashkey_param(&p, false);
153 }
154
155 /*
156 * Hashes ip_vs_conn in ip_vs_conn_tab by netns,proto,addr,port.
157 * returns bool success.
158 */
159 static inline int ip_vs_conn_hash(struct ip_vs_conn *cp)
160 {
161 unsigned int hash;
162 int ret;
163
164 if (cp->flags & IP_VS_CONN_F_ONE_PACKET)
165 return 0;
166
167 /* Hash by protocol, client address and port */
168 hash = ip_vs_conn_hashkey_conn(cp);
169
170 ct_write_lock_bh(hash);
171 spin_lock(&cp->lock);
172
173 if (!(cp->flags & IP_VS_CONN_F_HASHED)) {
174 cp->flags |= IP_VS_CONN_F_HASHED;
175 atomic_inc(&cp->refcnt);
176 hlist_add_head_rcu(&cp->c_list, &ip_vs_conn_tab[hash]);
177 ret = 1;
178 } else {
179 pr_err("%s(): request for already hashed, called from %pF\n",
180 __func__, __builtin_return_address(0));
181 ret = 0;
182 }
183
184 spin_unlock(&cp->lock);
185 ct_write_unlock_bh(hash);
186
187 return ret;
188 }
189
190
191 /*
192 * UNhashes ip_vs_conn from ip_vs_conn_tab.
193 * returns bool success. Caller should hold conn reference.
194 */
195 static inline int ip_vs_conn_unhash(struct ip_vs_conn *cp)
196 {
197 unsigned int hash;
198 int ret;
199
200 /* unhash it and decrease its reference counter */
201 hash = ip_vs_conn_hashkey_conn(cp);
202
203 ct_write_lock_bh(hash);
204 spin_lock(&cp->lock);
205
206 if (cp->flags & IP_VS_CONN_F_HASHED) {
207 hlist_del_rcu(&cp->c_list);
208 cp->flags &= ~IP_VS_CONN_F_HASHED;
209 atomic_dec(&cp->refcnt);
210 ret = 1;
211 } else
212 ret = 0;
213
214 spin_unlock(&cp->lock);
215 ct_write_unlock_bh(hash);
216
217 return ret;
218 }
219
220 /* Try to unlink ip_vs_conn from ip_vs_conn_tab.
221 * returns bool success.
222 */
223 static inline bool ip_vs_conn_unlink(struct ip_vs_conn *cp)
224 {
225 unsigned int hash;
226 bool ret;
227
228 hash = ip_vs_conn_hashkey_conn(cp);
229
230 ct_write_lock_bh(hash);
231 spin_lock(&cp->lock);
232
233 if (cp->flags & IP_VS_CONN_F_HASHED) {
234 ret = false;
235 /* Decrease refcnt and unlink conn only if we are last user */
236 if (atomic_cmpxchg(&cp->refcnt, 1, 0) == 1) {
237 hlist_del_rcu(&cp->c_list);
238 cp->flags &= ~IP_VS_CONN_F_HASHED;
239 ret = true;
240 }
241 } else
242 ret = atomic_read(&cp->refcnt) ? false : true;
243
244 spin_unlock(&cp->lock);
245 ct_write_unlock_bh(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 int hash;
261 struct ip_vs_conn *cp;
262
263 hash = ip_vs_conn_hashkey_param(p, false);
264
265 rcu_read_lock();
266
267 hlist_for_each_entry_rcu(cp, &ip_vs_conn_tab[hash], c_list) {
268 if (p->cport == cp->cport && p->vport == cp->vport &&
269 cp->af == p->af &&
270 ip_vs_addr_equal(p->af, p->caddr, &cp->caddr) &&
271 ip_vs_addr_equal(p->af, p->vaddr, &cp->vaddr) &&
272 ((!p->cport) ^ (!(cp->flags & IP_VS_CONN_F_NO_CPORT))) &&
273 p->protocol == cp->protocol &&
274 ip_vs_conn_net_eq(cp, p->net)) {
275 if (!__ip_vs_conn_get(cp))
276 continue;
277 /* HIT */
278 rcu_read_unlock();
279 return cp;
280 }
281 }
282
283 rcu_read_unlock();
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 int inverse, struct ip_vs_conn_param *p)
312 {
313 __be16 _ports[2], *pptr;
314 struct net *net = skb_net(skb);
315
316 pptr = frag_safe_skb_hp(skb, iph->len, sizeof(_ports), _ports, iph);
317 if (pptr == NULL)
318 return 1;
319
320 if (likely(!inverse))
321 ip_vs_conn_fill_param(net, af, iph->protocol, &iph->saddr,
322 pptr[0], &iph->daddr, pptr[1], p);
323 else
324 ip_vs_conn_fill_param(net, af, iph->protocol, &iph->daddr,
325 pptr[1], &iph->saddr, pptr[0], p);
326 return 0;
327 }
328
329 struct ip_vs_conn *
330 ip_vs_conn_in_get_proto(int af, const struct sk_buff *skb,
331 const struct ip_vs_iphdr *iph, int inverse)
332 {
333 struct ip_vs_conn_param p;
334
335 if (ip_vs_conn_fill_param_proto(af, skb, iph, inverse, &p))
336 return NULL;
337
338 return ip_vs_conn_in_get(&p);
339 }
340 EXPORT_SYMBOL_GPL(ip_vs_conn_in_get_proto);
341
342 /* Get reference to connection template */
343 struct ip_vs_conn *ip_vs_ct_in_get(const struct ip_vs_conn_param *p)
344 {
345 unsigned int hash;
346 struct ip_vs_conn *cp;
347
348 hash = ip_vs_conn_hashkey_param(p, false);
349
350 rcu_read_lock();
351
352 hlist_for_each_entry_rcu(cp, &ip_vs_conn_tab[hash], c_list) {
353 if (unlikely(p->pe_data && p->pe->ct_match)) {
354 if (!ip_vs_conn_net_eq(cp, p->net))
355 continue;
356 if (p->pe == cp->pe && p->pe->ct_match(p, cp)) {
357 if (__ip_vs_conn_get(cp))
358 goto out;
359 }
360 continue;
361 }
362
363 if (cp->af == p->af &&
364 ip_vs_addr_equal(p->af, p->caddr, &cp->caddr) &&
365 /* protocol should only be IPPROTO_IP if
366 * p->vaddr is a fwmark */
367 ip_vs_addr_equal(p->protocol == IPPROTO_IP ? AF_UNSPEC :
368 p->af, p->vaddr, &cp->vaddr) &&
369 p->vport == cp->vport && p->cport == cp->cport &&
370 cp->flags & IP_VS_CONN_F_TEMPLATE &&
371 p->protocol == cp->protocol &&
372 ip_vs_conn_net_eq(cp, p->net)) {
373 if (__ip_vs_conn_get(cp))
374 goto out;
375 }
376 }
377 cp = NULL;
378
379 out:
380 rcu_read_unlock();
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 int hash;
398 struct ip_vs_conn *cp, *ret=NULL;
399
400 /*
401 * Check for "full" addressed entries
402 */
403 hash = ip_vs_conn_hashkey_param(p, true);
404
405 rcu_read_lock();
406
407 hlist_for_each_entry_rcu(cp, &ip_vs_conn_tab[hash], c_list) {
408 if (p->vport == cp->cport && p->cport == cp->dport &&
409 cp->af == p->af &&
410 ip_vs_addr_equal(p->af, p->vaddr, &cp->caddr) &&
411 ip_vs_addr_equal(p->af, p->caddr, &cp->daddr) &&
412 p->protocol == cp->protocol &&
413 ip_vs_conn_net_eq(cp, p->net)) {
414 if (!__ip_vs_conn_get(cp))
415 continue;
416 /* HIT */
417 ret = cp;
418 break;
419 }
420 }
421
422 rcu_read_unlock();
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, int inverse)
436 {
437 struct ip_vs_conn_param p;
438
439 if (ip_vs_conn_fill_param_proto(af, skb, iph, inverse, &p))
440 return NULL;
441
442 return ip_vs_conn_out_get(&p);
443 }
444 EXPORT_SYMBOL_GPL(ip_vs_conn_out_get_proto);
445
446 /*
447 * Put back the conn and restart its timer with its timeout
448 */
449 void ip_vs_conn_put(struct ip_vs_conn *cp)
450 {
451 unsigned long t = (cp->flags & IP_VS_CONN_F_ONE_PACKET) ?
452 0 : cp->timeout;
453 mod_timer(&cp->timer, jiffies+t);
454
455 __ip_vs_conn_put(cp);
456 }
457
458
459 /*
460 * Fill a no_client_port connection with a client port number
461 */
462 void ip_vs_conn_fill_cport(struct ip_vs_conn *cp, __be16 cport)
463 {
464 if (ip_vs_conn_unhash(cp)) {
465 spin_lock_bh(&cp->lock);
466 if (cp->flags & IP_VS_CONN_F_NO_CPORT) {
467 atomic_dec(&ip_vs_conn_no_cport_cnt);
468 cp->flags &= ~IP_VS_CONN_F_NO_CPORT;
469 cp->cport = cport;
470 }
471 spin_unlock_bh(&cp->lock);
472
473 /* hash on new dport */
474 ip_vs_conn_hash(cp);
475 }
476 }
477
478
479 /*
480 * Bind a connection entry with the corresponding packet_xmit.
481 * Called by ip_vs_conn_new.
482 */
483 static inline void ip_vs_bind_xmit(struct ip_vs_conn *cp)
484 {
485 switch (IP_VS_FWD_METHOD(cp)) {
486 case IP_VS_CONN_F_MASQ:
487 cp->packet_xmit = ip_vs_nat_xmit;
488 break;
489
490 case IP_VS_CONN_F_TUNNEL:
491 cp->packet_xmit = ip_vs_tunnel_xmit;
492 break;
493
494 case IP_VS_CONN_F_DROUTE:
495 cp->packet_xmit = ip_vs_dr_xmit;
496 break;
497
498 case IP_VS_CONN_F_LOCALNODE:
499 cp->packet_xmit = ip_vs_null_xmit;
500 break;
501
502 case IP_VS_CONN_F_BYPASS:
503 cp->packet_xmit = ip_vs_bypass_xmit;
504 break;
505 }
506 }
507
508 #ifdef CONFIG_IP_VS_IPV6
509 static inline void ip_vs_bind_xmit_v6(struct ip_vs_conn *cp)
510 {
511 switch (IP_VS_FWD_METHOD(cp)) {
512 case IP_VS_CONN_F_MASQ:
513 cp->packet_xmit = ip_vs_nat_xmit_v6;
514 break;
515
516 case IP_VS_CONN_F_TUNNEL:
517 cp->packet_xmit = ip_vs_tunnel_xmit_v6;
518 break;
519
520 case IP_VS_CONN_F_DROUTE:
521 cp->packet_xmit = ip_vs_dr_xmit_v6;
522 break;
523
524 case IP_VS_CONN_F_LOCALNODE:
525 cp->packet_xmit = ip_vs_null_xmit;
526 break;
527
528 case IP_VS_CONN_F_BYPASS:
529 cp->packet_xmit = ip_vs_bypass_xmit_v6;
530 break;
531 }
532 }
533 #endif
534
535
536 static inline int ip_vs_dest_totalconns(struct ip_vs_dest *dest)
537 {
538 return atomic_read(&dest->activeconns)
539 + atomic_read(&dest->inactconns);
540 }
541
542 /*
543 * Bind a connection entry with a virtual service destination
544 * Called just after a new connection entry is created.
545 */
546 static inline void
547 ip_vs_bind_dest(struct ip_vs_conn *cp, struct ip_vs_dest *dest)
548 {
549 unsigned int conn_flags;
550 __u32 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 ip_vs_dest_hold(dest);
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 flags = cp->flags;
563 /* Bind with the destination and its corresponding transmitter */
564 if (flags & IP_VS_CONN_F_SYNC) {
565 /* if the connection is not template and is created
566 * by sync, preserve the activity flag.
567 */
568 if (!(flags & IP_VS_CONN_F_TEMPLATE))
569 conn_flags &= ~IP_VS_CONN_F_INACTIVE;
570 /* connections inherit forwarding method from dest */
571 flags &= ~(IP_VS_CONN_F_FWD_MASK | IP_VS_CONN_F_NOOUTPUT);
572 }
573 flags |= conn_flags;
574 cp->flags = flags;
575 cp->dest = dest;
576
577 IP_VS_DBG_BUF(7, "Bind-dest %s c:%s:%d v:%s:%d "
578 "d:%s:%d fwd:%c s:%u conn->flags:%X conn->refcnt:%d "
579 "dest->refcnt:%d\n",
580 ip_vs_proto_name(cp->protocol),
581 IP_VS_DBG_ADDR(cp->af, &cp->caddr), ntohs(cp->cport),
582 IP_VS_DBG_ADDR(cp->af, &cp->vaddr), ntohs(cp->vport),
583 IP_VS_DBG_ADDR(cp->af, &cp->daddr), ntohs(cp->dport),
584 ip_vs_fwd_tag(cp), cp->state,
585 cp->flags, atomic_read(&cp->refcnt),
586 atomic_read(&dest->refcnt));
587
588 /* Update the connection counters */
589 if (!(flags & IP_VS_CONN_F_TEMPLATE)) {
590 /* It is a normal connection, so modify the counters
591 * according to the flags, later the protocol can
592 * update them on state change
593 */
594 if (!(flags & IP_VS_CONN_F_INACTIVE))
595 atomic_inc(&dest->activeconns);
596 else
597 atomic_inc(&dest->inactconns);
598 } else {
599 /* It is a persistent connection/template, so increase
600 the persistent connection counter */
601 atomic_inc(&dest->persistconns);
602 }
603
604 if (dest->u_threshold != 0 &&
605 ip_vs_dest_totalconns(dest) >= dest->u_threshold)
606 dest->flags |= IP_VS_DEST_F_OVERLOAD;
607 }
608
609
610 /*
611 * Check if there is a destination for the connection, if so
612 * bind the connection to the destination.
613 */
614 void ip_vs_try_bind_dest(struct ip_vs_conn *cp)
615 {
616 struct ip_vs_dest *dest;
617
618 rcu_read_lock();
619 dest = ip_vs_find_dest(ip_vs_conn_net(cp), cp->af, &cp->daddr,
620 cp->dport, &cp->vaddr, cp->vport,
621 cp->protocol, cp->fwmark, cp->flags);
622 if (dest) {
623 struct ip_vs_proto_data *pd;
624
625 spin_lock_bh(&cp->lock);
626 if (cp->dest) {
627 spin_unlock_bh(&cp->lock);
628 rcu_read_unlock();
629 return;
630 }
631
632 /* Applications work depending on the forwarding method
633 * but better to reassign them always when binding dest */
634 if (cp->app)
635 ip_vs_unbind_app(cp);
636
637 ip_vs_bind_dest(cp, dest);
638 spin_unlock_bh(&cp->lock);
639
640 /* Update its packet transmitter */
641 cp->packet_xmit = NULL;
642 #ifdef CONFIG_IP_VS_IPV6
643 if (cp->af == AF_INET6)
644 ip_vs_bind_xmit_v6(cp);
645 else
646 #endif
647 ip_vs_bind_xmit(cp);
648
649 pd = ip_vs_proto_data_get(ip_vs_conn_net(cp), cp->protocol);
650 if (pd && atomic_read(&pd->appcnt))
651 ip_vs_bind_app(cp, pd->pp);
652 }
653 rcu_read_unlock();
654 }
655
656
657 /*
658 * Unbind a connection entry with its VS destination
659 * Called by the ip_vs_conn_expire function.
660 */
661 static inline void ip_vs_unbind_dest(struct ip_vs_conn *cp)
662 {
663 struct ip_vs_dest *dest = cp->dest;
664
665 if (!dest)
666 return;
667
668 IP_VS_DBG_BUF(7, "Unbind-dest %s c:%s:%d v:%s:%d "
669 "d:%s:%d fwd:%c s:%u conn->flags:%X conn->refcnt:%d "
670 "dest->refcnt:%d\n",
671 ip_vs_proto_name(cp->protocol),
672 IP_VS_DBG_ADDR(cp->af, &cp->caddr), ntohs(cp->cport),
673 IP_VS_DBG_ADDR(cp->af, &cp->vaddr), ntohs(cp->vport),
674 IP_VS_DBG_ADDR(cp->af, &cp->daddr), ntohs(cp->dport),
675 ip_vs_fwd_tag(cp), cp->state,
676 cp->flags, atomic_read(&cp->refcnt),
677 atomic_read(&dest->refcnt));
678
679 /* Update the connection counters */
680 if (!(cp->flags & IP_VS_CONN_F_TEMPLATE)) {
681 /* It is a normal connection, so decrease the inactconns
682 or activeconns counter */
683 if (cp->flags & IP_VS_CONN_F_INACTIVE) {
684 atomic_dec(&dest->inactconns);
685 } else {
686 atomic_dec(&dest->activeconns);
687 }
688 } else {
689 /* It is a persistent connection/template, so decrease
690 the persistent connection counter */
691 atomic_dec(&dest->persistconns);
692 }
693
694 if (dest->l_threshold != 0) {
695 if (ip_vs_dest_totalconns(dest) < dest->l_threshold)
696 dest->flags &= ~IP_VS_DEST_F_OVERLOAD;
697 } else if (dest->u_threshold != 0) {
698 if (ip_vs_dest_totalconns(dest) * 4 < dest->u_threshold * 3)
699 dest->flags &= ~IP_VS_DEST_F_OVERLOAD;
700 } else {
701 if (dest->flags & IP_VS_DEST_F_OVERLOAD)
702 dest->flags &= ~IP_VS_DEST_F_OVERLOAD;
703 }
704
705 ip_vs_dest_put(dest);
706 }
707
708 static int expire_quiescent_template(struct netns_ipvs *ipvs,
709 struct ip_vs_dest *dest)
710 {
711 #ifdef CONFIG_SYSCTL
712 return ipvs->sysctl_expire_quiescent_template &&
713 (atomic_read(&dest->weight) == 0);
714 #else
715 return 0;
716 #endif
717 }
718
719 /*
720 * Checking if the destination of a connection template is available.
721 * If available, return 1, otherwise invalidate this connection
722 * template and return 0.
723 */
724 int ip_vs_check_template(struct ip_vs_conn *ct)
725 {
726 struct ip_vs_dest *dest = ct->dest;
727 struct netns_ipvs *ipvs = net_ipvs(ip_vs_conn_net(ct));
728
729 /*
730 * Checking the dest server status.
731 */
732 if ((dest == NULL) ||
733 !(dest->flags & IP_VS_DEST_F_AVAILABLE) ||
734 expire_quiescent_template(ipvs, dest)) {
735 IP_VS_DBG_BUF(9, "check_template: dest not available for "
736 "protocol %s s:%s:%d v:%s:%d "
737 "-> d:%s:%d\n",
738 ip_vs_proto_name(ct->protocol),
739 IP_VS_DBG_ADDR(ct->af, &ct->caddr),
740 ntohs(ct->cport),
741 IP_VS_DBG_ADDR(ct->af, &ct->vaddr),
742 ntohs(ct->vport),
743 IP_VS_DBG_ADDR(ct->af, &ct->daddr),
744 ntohs(ct->dport));
745
746 /*
747 * Invalidate the connection template
748 */
749 if (ct->vport != htons(0xffff)) {
750 if (ip_vs_conn_unhash(ct)) {
751 ct->dport = htons(0xffff);
752 ct->vport = htons(0xffff);
753 ct->cport = 0;
754 ip_vs_conn_hash(ct);
755 }
756 }
757
758 /*
759 * Simply decrease the refcnt of the template,
760 * don't restart its timer.
761 */
762 __ip_vs_conn_put(ct);
763 return 0;
764 }
765 return 1;
766 }
767
768 static void ip_vs_conn_rcu_free(struct rcu_head *head)
769 {
770 struct ip_vs_conn *cp = container_of(head, struct ip_vs_conn,
771 rcu_head);
772
773 ip_vs_pe_put(cp->pe);
774 kfree(cp->pe_data);
775 kmem_cache_free(ip_vs_conn_cachep, cp);
776 }
777
778 static void ip_vs_conn_expire(unsigned long data)
779 {
780 struct ip_vs_conn *cp = (struct ip_vs_conn *)data;
781 struct net *net = ip_vs_conn_net(cp);
782 struct netns_ipvs *ipvs = net_ipvs(net);
783
784 /*
785 * do I control anybody?
786 */
787 if (atomic_read(&cp->n_control))
788 goto expire_later;
789
790 /* Unlink conn if not referenced anymore */
791 if (likely(ip_vs_conn_unlink(cp))) {
792 /* delete the timer if it is activated by other users */
793 del_timer(&cp->timer);
794
795 /* does anybody control me? */
796 if (cp->control)
797 ip_vs_control_del(cp);
798
799 if (cp->flags & IP_VS_CONN_F_NFCT) {
800 ip_vs_conn_drop_conntrack(cp);
801 /* Do not access conntracks during subsys cleanup
802 * because nf_conntrack_find_get can not be used after
803 * conntrack cleanup for the net.
804 */
805 smp_rmb();
806 if (ipvs->enable)
807 ip_vs_conn_drop_conntrack(cp);
808 }
809
810 if (unlikely(cp->app != NULL))
811 ip_vs_unbind_app(cp);
812 ip_vs_unbind_dest(cp);
813 if (cp->flags & IP_VS_CONN_F_NO_CPORT)
814 atomic_dec(&ip_vs_conn_no_cport_cnt);
815 call_rcu(&cp->rcu_head, ip_vs_conn_rcu_free);
816 atomic_dec(&ipvs->conn_count);
817 return;
818 }
819
820 expire_later:
821 IP_VS_DBG(7, "delayed: conn->refcnt=%d conn->n_control=%d\n",
822 atomic_read(&cp->refcnt),
823 atomic_read(&cp->n_control));
824
825 atomic_inc(&cp->refcnt);
826 cp->timeout = 60*HZ;
827
828 if (ipvs->sync_state & IP_VS_STATE_MASTER)
829 ip_vs_sync_conn(net, cp, sysctl_sync_threshold(ipvs));
830
831 ip_vs_conn_put(cp);
832 }
833
834 /* Modify timer, so that it expires as soon as possible.
835 * Can be called without reference only if under RCU lock.
836 */
837 void ip_vs_conn_expire_now(struct ip_vs_conn *cp)
838 {
839 /* Using mod_timer_pending will ensure the timer is not
840 * modified after the final del_timer in ip_vs_conn_expire.
841 */
842 if (timer_pending(&cp->timer) &&
843 time_after(cp->timer.expires, jiffies))
844 mod_timer_pending(&cp->timer, jiffies);
845 }
846
847
848 /*
849 * Create a new connection entry and hash it into the ip_vs_conn_tab
850 */
851 struct ip_vs_conn *
852 ip_vs_conn_new(const struct ip_vs_conn_param *p,
853 const union nf_inet_addr *daddr, __be16 dport, unsigned int flags,
854 struct ip_vs_dest *dest, __u32 fwmark)
855 {
856 struct ip_vs_conn *cp;
857 struct netns_ipvs *ipvs = net_ipvs(p->net);
858 struct ip_vs_proto_data *pd = ip_vs_proto_data_get(p->net,
859 p->protocol);
860
861 cp = kmem_cache_alloc(ip_vs_conn_cachep, GFP_ATOMIC);
862 if (cp == NULL) {
863 IP_VS_ERR_RL("%s(): no memory\n", __func__);
864 return NULL;
865 }
866
867 INIT_HLIST_NODE(&cp->c_list);
868 setup_timer(&cp->timer, ip_vs_conn_expire, (unsigned long)cp);
869 ip_vs_conn_net_set(cp, p->net);
870 cp->af = p->af;
871 cp->protocol = p->protocol;
872 ip_vs_addr_set(p->af, &cp->caddr, p->caddr);
873 cp->cport = p->cport;
874 ip_vs_addr_set(p->af, &cp->vaddr, p->vaddr);
875 cp->vport = p->vport;
876 /* proto should only be IPPROTO_IP if d_addr is a fwmark */
877 ip_vs_addr_set(p->protocol == IPPROTO_IP ? AF_UNSPEC : p->af,
878 &cp->daddr, daddr);
879 cp->dport = dport;
880 cp->flags = flags;
881 cp->fwmark = fwmark;
882 if (flags & IP_VS_CONN_F_TEMPLATE && p->pe) {
883 ip_vs_pe_get(p->pe);
884 cp->pe = p->pe;
885 cp->pe_data = p->pe_data;
886 cp->pe_data_len = p->pe_data_len;
887 } else {
888 cp->pe = NULL;
889 cp->pe_data = NULL;
890 cp->pe_data_len = 0;
891 }
892 spin_lock_init(&cp->lock);
893
894 /*
895 * Set the entry is referenced by the current thread before hashing
896 * it in the table, so that other thread run ip_vs_random_dropentry
897 * but cannot drop this entry.
898 */
899 atomic_set(&cp->refcnt, 1);
900
901 cp->control = NULL;
902 atomic_set(&cp->n_control, 0);
903 atomic_set(&cp->in_pkts, 0);
904
905 cp->packet_xmit = NULL;
906 cp->app = NULL;
907 cp->app_data = NULL;
908 /* reset struct ip_vs_seq */
909 cp->in_seq.delta = 0;
910 cp->out_seq.delta = 0;
911
912 atomic_inc(&ipvs->conn_count);
913 if (flags & IP_VS_CONN_F_NO_CPORT)
914 atomic_inc(&ip_vs_conn_no_cport_cnt);
915
916 /* Bind the connection with a destination server */
917 cp->dest = NULL;
918 ip_vs_bind_dest(cp, dest);
919
920 /* Set its state and timeout */
921 cp->state = 0;
922 cp->old_state = 0;
923 cp->timeout = 3*HZ;
924 cp->sync_endtime = jiffies & ~3UL;
925
926 /* Bind its packet transmitter */
927 #ifdef CONFIG_IP_VS_IPV6
928 if (p->af == AF_INET6)
929 ip_vs_bind_xmit_v6(cp);
930 else
931 #endif
932 ip_vs_bind_xmit(cp);
933
934 if (unlikely(pd && atomic_read(&pd->appcnt)))
935 ip_vs_bind_app(cp, pd->pp);
936
937 /*
938 * Allow conntrack to be preserved. By default, conntrack
939 * is created and destroyed for every packet.
940 * Sometimes keeping conntrack can be useful for
941 * IP_VS_CONN_F_ONE_PACKET too.
942 */
943
944 if (ip_vs_conntrack_enabled(ipvs))
945 cp->flags |= IP_VS_CONN_F_NFCT;
946
947 /* Hash it in the ip_vs_conn_tab finally */
948 ip_vs_conn_hash(cp);
949
950 return cp;
951 }
952
953 /*
954 * /proc/net/ip_vs_conn entries
955 */
956 #ifdef CONFIG_PROC_FS
957 struct ip_vs_iter_state {
958 struct seq_net_private p;
959 struct hlist_head *l;
960 };
961
962 static void *ip_vs_conn_array(struct seq_file *seq, loff_t pos)
963 {
964 int idx;
965 struct ip_vs_conn *cp;
966 struct ip_vs_iter_state *iter = seq->private;
967
968 for (idx = 0; idx < ip_vs_conn_tab_size; idx++) {
969 hlist_for_each_entry_rcu(cp, &ip_vs_conn_tab[idx], c_list) {
970 /* __ip_vs_conn_get() is not needed by
971 * ip_vs_conn_seq_show and ip_vs_conn_sync_seq_show
972 */
973 if (pos-- == 0) {
974 iter->l = &ip_vs_conn_tab[idx];
975 return cp;
976 }
977 }
978 cond_resched_rcu();
979 }
980
981 return NULL;
982 }
983
984 static void *ip_vs_conn_seq_start(struct seq_file *seq, loff_t *pos)
985 __acquires(RCU)
986 {
987 struct ip_vs_iter_state *iter = seq->private;
988
989 iter->l = NULL;
990 rcu_read_lock();
991 return *pos ? ip_vs_conn_array(seq, *pos - 1) :SEQ_START_TOKEN;
992 }
993
994 static void *ip_vs_conn_seq_next(struct seq_file *seq, void *v, loff_t *pos)
995 {
996 struct ip_vs_conn *cp = v;
997 struct ip_vs_iter_state *iter = seq->private;
998 struct hlist_node *e;
999 struct hlist_head *l = iter->l;
1000 int idx;
1001
1002 ++*pos;
1003 if (v == SEQ_START_TOKEN)
1004 return ip_vs_conn_array(seq, 0);
1005
1006 /* more on same hash chain? */
1007 e = rcu_dereference(hlist_next_rcu(&cp->c_list));
1008 if (e)
1009 return hlist_entry(e, struct ip_vs_conn, c_list);
1010
1011 idx = l - ip_vs_conn_tab;
1012 while (++idx < ip_vs_conn_tab_size) {
1013 hlist_for_each_entry_rcu(cp, &ip_vs_conn_tab[idx], c_list) {
1014 iter->l = &ip_vs_conn_tab[idx];
1015 return cp;
1016 }
1017 cond_resched_rcu();
1018 }
1019 iter->l = NULL;
1020 return NULL;
1021 }
1022
1023 static void ip_vs_conn_seq_stop(struct seq_file *seq, void *v)
1024 __releases(RCU)
1025 {
1026 rcu_read_unlock();
1027 }
1028
1029 static int ip_vs_conn_seq_show(struct seq_file *seq, void *v)
1030 {
1031
1032 if (v == SEQ_START_TOKEN)
1033 seq_puts(seq,
1034 "Pro FromIP FPrt ToIP TPrt DestIP DPrt State Expires PEName PEData\n");
1035 else {
1036 const struct ip_vs_conn *cp = v;
1037 struct net *net = seq_file_net(seq);
1038 char pe_data[IP_VS_PENAME_MAXLEN + IP_VS_PEDATA_MAXLEN + 3];
1039 size_t len = 0;
1040
1041 if (!ip_vs_conn_net_eq(cp, net))
1042 return 0;
1043 if (cp->pe_data) {
1044 pe_data[0] = ' ';
1045 len = strlen(cp->pe->name);
1046 memcpy(pe_data + 1, cp->pe->name, len);
1047 pe_data[len + 1] = ' ';
1048 len += 2;
1049 len += cp->pe->show_pe_data(cp, pe_data + len);
1050 }
1051 pe_data[len] = '\0';
1052
1053 #ifdef CONFIG_IP_VS_IPV6
1054 if (cp->af == AF_INET6)
1055 seq_printf(seq, "%-3s %pI6 %04X %pI6 %04X "
1056 "%pI6 %04X %-11s %7lu%s\n",
1057 ip_vs_proto_name(cp->protocol),
1058 &cp->caddr.in6, ntohs(cp->cport),
1059 &cp->vaddr.in6, ntohs(cp->vport),
1060 &cp->daddr.in6, ntohs(cp->dport),
1061 ip_vs_state_name(cp->protocol, cp->state),
1062 (cp->timer.expires-jiffies)/HZ, pe_data);
1063 else
1064 #endif
1065 seq_printf(seq,
1066 "%-3s %08X %04X %08X %04X"
1067 " %08X %04X %-11s %7lu%s\n",
1068 ip_vs_proto_name(cp->protocol),
1069 ntohl(cp->caddr.ip), ntohs(cp->cport),
1070 ntohl(cp->vaddr.ip), ntohs(cp->vport),
1071 ntohl(cp->daddr.ip), ntohs(cp->dport),
1072 ip_vs_state_name(cp->protocol, cp->state),
1073 (cp->timer.expires-jiffies)/HZ, pe_data);
1074 }
1075 return 0;
1076 }
1077
1078 static const struct seq_operations ip_vs_conn_seq_ops = {
1079 .start = ip_vs_conn_seq_start,
1080 .next = ip_vs_conn_seq_next,
1081 .stop = ip_vs_conn_seq_stop,
1082 .show = ip_vs_conn_seq_show,
1083 };
1084
1085 static int ip_vs_conn_open(struct inode *inode, struct file *file)
1086 {
1087 return seq_open_net(inode, file, &ip_vs_conn_seq_ops,
1088 sizeof(struct ip_vs_iter_state));
1089 }
1090
1091 static const struct file_operations ip_vs_conn_fops = {
1092 .owner = THIS_MODULE,
1093 .open = ip_vs_conn_open,
1094 .read = seq_read,
1095 .llseek = seq_lseek,
1096 .release = seq_release_net,
1097 };
1098
1099 static const char *ip_vs_origin_name(unsigned int flags)
1100 {
1101 if (flags & IP_VS_CONN_F_SYNC)
1102 return "SYNC";
1103 else
1104 return "LOCAL";
1105 }
1106
1107 static int ip_vs_conn_sync_seq_show(struct seq_file *seq, void *v)
1108 {
1109
1110 if (v == SEQ_START_TOKEN)
1111 seq_puts(seq,
1112 "Pro FromIP FPrt ToIP TPrt DestIP DPrt State Origin Expires\n");
1113 else {
1114 const struct ip_vs_conn *cp = v;
1115 struct net *net = seq_file_net(seq);
1116
1117 if (!ip_vs_conn_net_eq(cp, net))
1118 return 0;
1119
1120 #ifdef CONFIG_IP_VS_IPV6
1121 if (cp->af == AF_INET6)
1122 seq_printf(seq, "%-3s %pI6 %04X %pI6 %04X %pI6 %04X %-11s %-6s %7lu\n",
1123 ip_vs_proto_name(cp->protocol),
1124 &cp->caddr.in6, ntohs(cp->cport),
1125 &cp->vaddr.in6, ntohs(cp->vport),
1126 &cp->daddr.in6, ntohs(cp->dport),
1127 ip_vs_state_name(cp->protocol, cp->state),
1128 ip_vs_origin_name(cp->flags),
1129 (cp->timer.expires-jiffies)/HZ);
1130 else
1131 #endif
1132 seq_printf(seq,
1133 "%-3s %08X %04X %08X %04X "
1134 "%08X %04X %-11s %-6s %7lu\n",
1135 ip_vs_proto_name(cp->protocol),
1136 ntohl(cp->caddr.ip), ntohs(cp->cport),
1137 ntohl(cp->vaddr.ip), ntohs(cp->vport),
1138 ntohl(cp->daddr.ip), ntohs(cp->dport),
1139 ip_vs_state_name(cp->protocol, cp->state),
1140 ip_vs_origin_name(cp->flags),
1141 (cp->timer.expires-jiffies)/HZ);
1142 }
1143 return 0;
1144 }
1145
1146 static const struct seq_operations ip_vs_conn_sync_seq_ops = {
1147 .start = ip_vs_conn_seq_start,
1148 .next = ip_vs_conn_seq_next,
1149 .stop = ip_vs_conn_seq_stop,
1150 .show = ip_vs_conn_sync_seq_show,
1151 };
1152
1153 static int ip_vs_conn_sync_open(struct inode *inode, struct file *file)
1154 {
1155 return seq_open_net(inode, file, &ip_vs_conn_sync_seq_ops,
1156 sizeof(struct ip_vs_iter_state));
1157 }
1158
1159 static const struct file_operations ip_vs_conn_sync_fops = {
1160 .owner = THIS_MODULE,
1161 .open = ip_vs_conn_sync_open,
1162 .read = seq_read,
1163 .llseek = seq_lseek,
1164 .release = seq_release_net,
1165 };
1166
1167 #endif
1168
1169
1170 /*
1171 * Randomly drop connection entries before running out of memory
1172 */
1173 static inline int todrop_entry(struct ip_vs_conn *cp)
1174 {
1175 /*
1176 * The drop rate array needs tuning for real environments.
1177 * Called from timer bh only => no locking
1178 */
1179 static const char todrop_rate[9] = {0, 1, 2, 3, 4, 5, 6, 7, 8};
1180 static char todrop_counter[9] = {0};
1181 int i;
1182
1183 /* if the conn entry hasn't lasted for 60 seconds, don't drop it.
1184 This will leave enough time for normal connection to get
1185 through. */
1186 if (time_before(cp->timeout + jiffies, cp->timer.expires + 60*HZ))
1187 return 0;
1188
1189 /* Don't drop the entry if its number of incoming packets is not
1190 located in [0, 8] */
1191 i = atomic_read(&cp->in_pkts);
1192 if (i > 8 || i < 0) return 0;
1193
1194 if (!todrop_rate[i]) return 0;
1195 if (--todrop_counter[i] > 0) return 0;
1196
1197 todrop_counter[i] = todrop_rate[i];
1198 return 1;
1199 }
1200
1201 /* Called from keventd and must protect itself from softirqs */
1202 void ip_vs_random_dropentry(struct net *net)
1203 {
1204 int idx;
1205 struct ip_vs_conn *cp, *cp_c;
1206
1207 rcu_read_lock();
1208 /*
1209 * Randomly scan 1/32 of the whole table every second
1210 */
1211 for (idx = 0; idx < (ip_vs_conn_tab_size>>5); idx++) {
1212 unsigned int hash = net_random() & ip_vs_conn_tab_mask;
1213
1214 hlist_for_each_entry_rcu(cp, &ip_vs_conn_tab[hash], c_list) {
1215 if (cp->flags & IP_VS_CONN_F_TEMPLATE)
1216 /* connection template */
1217 continue;
1218 if (!ip_vs_conn_net_eq(cp, net))
1219 continue;
1220 if (cp->protocol == IPPROTO_TCP) {
1221 switch(cp->state) {
1222 case IP_VS_TCP_S_SYN_RECV:
1223 case IP_VS_TCP_S_SYNACK:
1224 break;
1225
1226 case IP_VS_TCP_S_ESTABLISHED:
1227 if (todrop_entry(cp))
1228 break;
1229 continue;
1230
1231 default:
1232 continue;
1233 }
1234 } else if (cp->protocol == IPPROTO_SCTP) {
1235 switch (cp->state) {
1236 case IP_VS_SCTP_S_INIT1:
1237 case IP_VS_SCTP_S_INIT:
1238 break;
1239 case IP_VS_SCTP_S_ESTABLISHED:
1240 if (todrop_entry(cp))
1241 break;
1242 continue;
1243 default:
1244 continue;
1245 }
1246 } else {
1247 if (!todrop_entry(cp))
1248 continue;
1249 }
1250
1251 IP_VS_DBG(4, "del connection\n");
1252 ip_vs_conn_expire_now(cp);
1253 cp_c = cp->control;
1254 /* cp->control is valid only with reference to cp */
1255 if (cp_c && __ip_vs_conn_get(cp)) {
1256 IP_VS_DBG(4, "del conn template\n");
1257 ip_vs_conn_expire_now(cp_c);
1258 __ip_vs_conn_put(cp);
1259 }
1260 }
1261 cond_resched_rcu();
1262 }
1263 rcu_read_unlock();
1264 }
1265
1266
1267 /*
1268 * Flush all the connection entries in the ip_vs_conn_tab
1269 */
1270 static void ip_vs_conn_flush(struct net *net)
1271 {
1272 int idx;
1273 struct ip_vs_conn *cp, *cp_c;
1274 struct netns_ipvs *ipvs = net_ipvs(net);
1275
1276 flush_again:
1277 rcu_read_lock();
1278 for (idx = 0; idx < ip_vs_conn_tab_size; idx++) {
1279
1280 hlist_for_each_entry_rcu(cp, &ip_vs_conn_tab[idx], c_list) {
1281 if (!ip_vs_conn_net_eq(cp, net))
1282 continue;
1283 IP_VS_DBG(4, "del connection\n");
1284 ip_vs_conn_expire_now(cp);
1285 cp_c = cp->control;
1286 /* cp->control is valid only with reference to cp */
1287 if (cp_c && __ip_vs_conn_get(cp)) {
1288 IP_VS_DBG(4, "del conn template\n");
1289 ip_vs_conn_expire_now(cp_c);
1290 __ip_vs_conn_put(cp);
1291 }
1292 }
1293 cond_resched_rcu();
1294 }
1295 rcu_read_unlock();
1296
1297 /* the counter may be not NULL, because maybe some conn entries
1298 are run by slow timer handler or unhashed but still referred */
1299 if (atomic_read(&ipvs->conn_count) != 0) {
1300 schedule();
1301 goto flush_again;
1302 }
1303 }
1304 /*
1305 * per netns init and exit
1306 */
1307 int __net_init ip_vs_conn_net_init(struct net *net)
1308 {
1309 struct netns_ipvs *ipvs = net_ipvs(net);
1310
1311 atomic_set(&ipvs->conn_count, 0);
1312
1313 proc_create("ip_vs_conn", 0, net->proc_net, &ip_vs_conn_fops);
1314 proc_create("ip_vs_conn_sync", 0, net->proc_net, &ip_vs_conn_sync_fops);
1315 return 0;
1316 }
1317
1318 void __net_exit ip_vs_conn_net_cleanup(struct net *net)
1319 {
1320 /* flush all the connection entries first */
1321 ip_vs_conn_flush(net);
1322 remove_proc_entry("ip_vs_conn", net->proc_net);
1323 remove_proc_entry("ip_vs_conn_sync", net->proc_net);
1324 }
1325
1326 int __init ip_vs_conn_init(void)
1327 {
1328 int idx;
1329
1330 /* Compute size and mask */
1331 ip_vs_conn_tab_size = 1 << ip_vs_conn_tab_bits;
1332 ip_vs_conn_tab_mask = ip_vs_conn_tab_size - 1;
1333
1334 /*
1335 * Allocate the connection hash table and initialize its list heads
1336 */
1337 ip_vs_conn_tab = vmalloc(ip_vs_conn_tab_size * sizeof(*ip_vs_conn_tab));
1338 if (!ip_vs_conn_tab)
1339 return -ENOMEM;
1340
1341 /* Allocate ip_vs_conn slab cache */
1342 ip_vs_conn_cachep = kmem_cache_create("ip_vs_conn",
1343 sizeof(struct ip_vs_conn), 0,
1344 SLAB_HWCACHE_ALIGN, NULL);
1345 if (!ip_vs_conn_cachep) {
1346 vfree(ip_vs_conn_tab);
1347 return -ENOMEM;
1348 }
1349
1350 pr_info("Connection hash table configured "
1351 "(size=%d, memory=%ldKbytes)\n",
1352 ip_vs_conn_tab_size,
1353 (long)(ip_vs_conn_tab_size*sizeof(struct list_head))/1024);
1354 IP_VS_DBG(0, "Each connection entry needs %Zd bytes at least\n",
1355 sizeof(struct ip_vs_conn));
1356
1357 for (idx = 0; idx < ip_vs_conn_tab_size; idx++)
1358 INIT_HLIST_HEAD(&ip_vs_conn_tab[idx]);
1359
1360 for (idx = 0; idx < CT_LOCKARRAY_SIZE; idx++) {
1361 spin_lock_init(&__ip_vs_conntbl_lock_array[idx].l);
1362 }
1363
1364 /* calculate the random value for connection hash */
1365 get_random_bytes(&ip_vs_conn_rnd, sizeof(ip_vs_conn_rnd));
1366
1367 return 0;
1368 }
1369
1370 void ip_vs_conn_cleanup(void)
1371 {
1372 /* Wait all ip_vs_conn_rcu_free() callbacks to complete */
1373 rcu_barrier();
1374 /* Release the empty cache */
1375 kmem_cache_destroy(ip_vs_conn_cachep);
1376 vfree(ip_vs_conn_tab);
1377 }
Linus' kernel tree