projects / deliverable / linux.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
Merge branch 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[deliverable/linux.git] / net / netfilter / ipvs / ip_vs_conn.c
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 int 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 int 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 int 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 int 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 int 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 int 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 int 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 int 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 int 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 int 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 int 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 int 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 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 struct hlist_node *n;
348
349 hash = ip_vs_conn_hashkey_param(p, false);
350
351 ct_read_lock(hash);
352
353 hlist_for_each_entry(cp, n, &ip_vs_conn_tab[hash], c_list) {
354 if (!ip_vs_conn_net_eq(cp, p->net))
355 continue;
356 if (p->pe_data && p->pe->ct_match) {
357 if (p->pe == cp->pe && p->pe->ct_match(p, cp))
358 goto out;
359 continue;
360 }
361
362 if (cp->af == p->af &&
363 ip_vs_addr_equal(p->af, p->caddr, &cp->caddr) &&
364 /* protocol should only be IPPROTO_IP if
365 * p->vaddr is a fwmark */
366 ip_vs_addr_equal(p->protocol == IPPROTO_IP ? AF_UNSPEC :
367 p->af, p->vaddr, &cp->vaddr) &&
368 p->cport == cp->cport && p->vport == cp->vport &&
369 cp->flags & IP_VS_CONN_F_TEMPLATE &&
370 p->protocol == cp->protocol)
371 goto out;
372 }
373 cp = NULL;
374
375 out:
376 if (cp)
377 atomic_inc(&cp->refcnt);
378 ct_read_unlock(hash);
379
380 IP_VS_DBG_BUF(9, "template lookup/in %s %s:%d->%s:%d %s\n",
381 ip_vs_proto_name(p->protocol),
382 IP_VS_DBG_ADDR(p->af, p->caddr), ntohs(p->cport),
383 IP_VS_DBG_ADDR(p->af, p->vaddr), ntohs(p->vport),
384 cp ? "hit" : "not hit");
385
386 return cp;
387 }
388
389 /* Gets ip_vs_conn associated with supplied parameters in the ip_vs_conn_tab.
390 * Called for pkts coming from inside-to-OUTside.
391 * p->caddr, p->cport: pkt source address (inside host)
392 * p->vaddr, p->vport: pkt dest address (foreign host) */
393 struct ip_vs_conn *ip_vs_conn_out_get(const struct ip_vs_conn_param *p)
394 {
395 unsigned int hash;
396 struct ip_vs_conn *cp, *ret=NULL;
397 struct hlist_node *n;
398
399 /*
400 * Check for "full" addressed entries
401 */
402 hash = ip_vs_conn_hashkey_param(p, true);
403
404 ct_read_lock(hash);
405
406 hlist_for_each_entry(cp, n, &ip_vs_conn_tab[hash], c_list) {
407 if (cp->af == p->af &&
408 p->vport == cp->cport && p->cport == cp->dport &&
409 ip_vs_addr_equal(p->af, p->vaddr, &cp->caddr) &&
410 ip_vs_addr_equal(p->af, p->caddr, &cp->daddr) &&
411 p->protocol == cp->protocol &&
412 ip_vs_conn_net_eq(cp, p->net)) {
413 /* HIT */
414 atomic_inc(&cp->refcnt);
415 ret = cp;
416 break;
417 }
418 }
419
420 ct_read_unlock(hash);
421
422 IP_VS_DBG_BUF(9, "lookup/out %s %s:%d->%s:%d %s\n",
423 ip_vs_proto_name(p->protocol),
424 IP_VS_DBG_ADDR(p->af, p->caddr), ntohs(p->cport),
425 IP_VS_DBG_ADDR(p->af, p->vaddr), ntohs(p->vport),
426 ret ? "hit" : "not hit");
427
428 return ret;
429 }
430
431 struct ip_vs_conn *
432 ip_vs_conn_out_get_proto(int af, const struct sk_buff *skb,
433 const struct ip_vs_iphdr *iph, int inverse)
434 {
435 struct ip_vs_conn_param p;
436
437 if (ip_vs_conn_fill_param_proto(af, skb, iph, inverse, &p))
438 return NULL;
439
440 return ip_vs_conn_out_get(&p);
441 }
442 EXPORT_SYMBOL_GPL(ip_vs_conn_out_get_proto);
443
444 /*
445 * Put back the conn and restart its timer with its timeout
446 */
447 void ip_vs_conn_put(struct ip_vs_conn *cp)
448 {
449 unsigned long t = (cp->flags & IP_VS_CONN_F_ONE_PACKET) ?
450 0 : cp->timeout;
451 mod_timer(&cp->timer, jiffies+t);
452
453 __ip_vs_conn_put(cp);
454 }
455
456
457 /*
458 * Fill a no_client_port connection with a client port number
459 */
460 void ip_vs_conn_fill_cport(struct ip_vs_conn *cp, __be16 cport)
461 {
462 if (ip_vs_conn_unhash(cp)) {
463 spin_lock(&cp->lock);
464 if (cp->flags & IP_VS_CONN_F_NO_CPORT) {
465 atomic_dec(&ip_vs_conn_no_cport_cnt);
466 cp->flags &= ~IP_VS_CONN_F_NO_CPORT;
467 cp->cport = cport;
468 }
469 spin_unlock(&cp->lock);
470
471 /* hash on new dport */
472 ip_vs_conn_hash(cp);
473 }
474 }
475
476
477 /*
478 * Bind a connection entry with the corresponding packet_xmit.
479 * Called by ip_vs_conn_new.
480 */
481 static inline void ip_vs_bind_xmit(struct ip_vs_conn *cp)
482 {
483 switch (IP_VS_FWD_METHOD(cp)) {
484 case IP_VS_CONN_F_MASQ:
485 cp->packet_xmit = ip_vs_nat_xmit;
486 break;
487
488 case IP_VS_CONN_F_TUNNEL:
489 cp->packet_xmit = ip_vs_tunnel_xmit;
490 break;
491
492 case IP_VS_CONN_F_DROUTE:
493 cp->packet_xmit = ip_vs_dr_xmit;
494 break;
495
496 case IP_VS_CONN_F_LOCALNODE:
497 cp->packet_xmit = ip_vs_null_xmit;
498 break;
499
500 case IP_VS_CONN_F_BYPASS:
501 cp->packet_xmit = ip_vs_bypass_xmit;
502 break;
503 }
504 }
505
506 #ifdef CONFIG_IP_VS_IPV6
507 static inline void ip_vs_bind_xmit_v6(struct ip_vs_conn *cp)
508 {
509 switch (IP_VS_FWD_METHOD(cp)) {
510 case IP_VS_CONN_F_MASQ:
511 cp->packet_xmit = ip_vs_nat_xmit_v6;
512 break;
513
514 case IP_VS_CONN_F_TUNNEL:
515 cp->packet_xmit = ip_vs_tunnel_xmit_v6;
516 break;
517
518 case IP_VS_CONN_F_DROUTE:
519 cp->packet_xmit = ip_vs_dr_xmit_v6;
520 break;
521
522 case IP_VS_CONN_F_LOCALNODE:
523 cp->packet_xmit = ip_vs_null_xmit;
524 break;
525
526 case IP_VS_CONN_F_BYPASS:
527 cp->packet_xmit = ip_vs_bypass_xmit_v6;
528 break;
529 }
530 }
531 #endif
532
533
534 static inline int ip_vs_dest_totalconns(struct ip_vs_dest *dest)
535 {
536 return atomic_read(&dest->activeconns)
537 + atomic_read(&dest->inactconns);
538 }
539
540 /*
541 * Bind a connection entry with a virtual service destination
542 * Called just after a new connection entry is created.
543 */
544 static inline void
545 ip_vs_bind_dest(struct ip_vs_conn *cp, struct ip_vs_dest *dest)
546 {
547 unsigned int conn_flags;
548 __u32 flags;
549
550 /* if dest is NULL, then return directly */
551 if (!dest)
552 return;
553
554 /* Increase the refcnt counter of the dest */
555 atomic_inc(&dest->refcnt);
556
557 conn_flags = atomic_read(&dest->conn_flags);
558 if (cp->protocol != IPPROTO_UDP)
559 conn_flags &= ~IP_VS_CONN_F_ONE_PACKET;
560 flags = cp->flags;
561 /* Bind with the destination and its corresponding transmitter */
562 if (flags & IP_VS_CONN_F_SYNC) {
563 /* if the connection is not template and is created
564 * by sync, preserve the activity flag.
565 */
566 if (!(flags & IP_VS_CONN_F_TEMPLATE))
567 conn_flags &= ~IP_VS_CONN_F_INACTIVE;
568 /* connections inherit forwarding method from dest */
569 flags &= ~(IP_VS_CONN_F_FWD_MASK | IP_VS_CONN_F_NOOUTPUT);
570 }
571 flags |= conn_flags;
572 cp->flags = 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 (!(flags & IP_VS_CONN_F_TEMPLATE)) {
588 /* It is a normal connection, so modify the counters
589 * according to the flags, later the protocol can
590 * update them on state change
591 */
592 if (!(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 dest = ip_vs_find_dest(ip_vs_conn_net(cp), cp->af, &cp->daddr,
617 cp->dport, &cp->vaddr, cp->vport,
618 cp->protocol, cp->fwmark, cp->flags);
619 if (dest) {
620 struct ip_vs_proto_data *pd;
621
622 spin_lock(&cp->lock);
623 if (cp->dest) {
624 spin_unlock(&cp->lock);
625 return dest;
626 }
627
628 /* Applications work depending on the forwarding method
629 * but better to reassign them always when binding dest */
630 if (cp->app)
631 ip_vs_unbind_app(cp);
632
633 ip_vs_bind_dest(cp, dest);
634 spin_unlock(&cp->lock);
635
636 /* Update its packet transmitter */
637 cp->packet_xmit = NULL;
638 #ifdef CONFIG_IP_VS_IPV6
639 if (cp->af == AF_INET6)
640 ip_vs_bind_xmit_v6(cp);
641 else
642 #endif
643 ip_vs_bind_xmit(cp);
644
645 pd = ip_vs_proto_data_get(ip_vs_conn_net(cp), cp->protocol);
646 if (pd && atomic_read(&pd->appcnt))
647 ip_vs_bind_app(cp, pd->pp);
648 }
649 return dest;
650 }
651
652
653 /*
654 * Unbind a connection entry with its VS destination
655 * Called by the ip_vs_conn_expire function.
656 */
657 static inline void ip_vs_unbind_dest(struct ip_vs_conn *cp)
658 {
659 struct ip_vs_dest *dest = cp->dest;
660
661 if (!dest)
662 return;
663
664 IP_VS_DBG_BUF(7, "Unbind-dest %s c:%s:%d v:%s:%d "
665 "d:%s:%d fwd:%c s:%u conn->flags:%X conn->refcnt:%d "
666 "dest->refcnt:%d\n",
667 ip_vs_proto_name(cp->protocol),
668 IP_VS_DBG_ADDR(cp->af, &cp->caddr), ntohs(cp->cport),
669 IP_VS_DBG_ADDR(cp->af, &cp->vaddr), ntohs(cp->vport),
670 IP_VS_DBG_ADDR(cp->af, &cp->daddr), ntohs(cp->dport),
671 ip_vs_fwd_tag(cp), cp->state,
672 cp->flags, atomic_read(&cp->refcnt),
673 atomic_read(&dest->refcnt));
674
675 /* Update the connection counters */
676 if (!(cp->flags & IP_VS_CONN_F_TEMPLATE)) {
677 /* It is a normal connection, so decrease the inactconns
678 or activeconns counter */
679 if (cp->flags & IP_VS_CONN_F_INACTIVE) {
680 atomic_dec(&dest->inactconns);
681 } else {
682 atomic_dec(&dest->activeconns);
683 }
684 } else {
685 /* It is a persistent connection/template, so decrease
686 the persistent connection counter */
687 atomic_dec(&dest->persistconns);
688 }
689
690 if (dest->l_threshold != 0) {
691 if (ip_vs_dest_totalconns(dest) < dest->l_threshold)
692 dest->flags &= ~IP_VS_DEST_F_OVERLOAD;
693 } else if (dest->u_threshold != 0) {
694 if (ip_vs_dest_totalconns(dest) * 4 < dest->u_threshold * 3)
695 dest->flags &= ~IP_VS_DEST_F_OVERLOAD;
696 } else {
697 if (dest->flags & IP_VS_DEST_F_OVERLOAD)
698 dest->flags &= ~IP_VS_DEST_F_OVERLOAD;
699 }
700
701 /*
702 * Simply decrease the refcnt of the dest, because the
703 * dest will be either in service's destination list
704 * or in the trash.
705 */
706 atomic_dec(&dest->refcnt);
707 }
708
709 static int expire_quiescent_template(struct netns_ipvs *ipvs,
710 struct ip_vs_dest *dest)
711 {
712 #ifdef CONFIG_SYSCTL
713 return ipvs->sysctl_expire_quiescent_template &&
714 (atomic_read(&dest->weight) == 0);
715 #else
716 return 0;
717 #endif
718 }
719
720 /*
721 * Checking if the destination of a connection template is available.
722 * If available, return 1, otherwise invalidate this connection
723 * template and return 0.
724 */
725 int ip_vs_check_template(struct ip_vs_conn *ct)
726 {
727 struct ip_vs_dest *dest = ct->dest;
728 struct netns_ipvs *ipvs = net_ipvs(ip_vs_conn_net(ct));
729
730 /*
731 * Checking the dest server status.
732 */
733 if ((dest == NULL) ||
734 !(dest->flags & IP_VS_DEST_F_AVAILABLE) ||
735 expire_quiescent_template(ipvs, dest)) {
736 IP_VS_DBG_BUF(9, "check_template: dest not available for "
737 "protocol %s s:%s:%d v:%s:%d "
738 "-> d:%s:%d\n",
739 ip_vs_proto_name(ct->protocol),
740 IP_VS_DBG_ADDR(ct->af, &ct->caddr),
741 ntohs(ct->cport),
742 IP_VS_DBG_ADDR(ct->af, &ct->vaddr),
743 ntohs(ct->vport),
744 IP_VS_DBG_ADDR(ct->af, &ct->daddr),
745 ntohs(ct->dport));
746
747 /*
748 * Invalidate the connection template
749 */
750 if (ct->vport != htons(0xffff)) {
751 if (ip_vs_conn_unhash(ct)) {
752 ct->dport = htons(0xffff);
753 ct->vport = htons(0xffff);
754 ct->cport = 0;
755 ip_vs_conn_hash(ct);
756 }
757 }
758
759 /*
760 * Simply decrease the refcnt of the template,
761 * don't restart its timer.
762 */
763 atomic_dec(&ct->refcnt);
764 return 0;
765 }
766 return 1;
767 }
768
769 static void ip_vs_conn_expire(unsigned long data)
770 {
771 struct ip_vs_conn *cp = (struct ip_vs_conn *)data;
772 struct net *net = ip_vs_conn_net(cp);
773 struct netns_ipvs *ipvs = net_ipvs(net);
774
775 cp->timeout = 60*HZ;
776
777 /*
778 * hey, I'm using it
779 */
780 atomic_inc(&cp->refcnt);
781
782 /*
783 * do I control anybody?
784 */
785 if (atomic_read(&cp->n_control))
786 goto expire_later;
787
788 /*
789 * unhash it if it is hashed in the conn table
790 */
791 if (!ip_vs_conn_unhash(cp) && !(cp->flags & IP_VS_CONN_F_ONE_PACKET))
792 goto expire_later;
793
794 /*
795 * refcnt==1 implies I'm the only one referrer
796 */
797 if (likely(atomic_read(&cp->refcnt) == 1)) {
798 /* delete the timer if it is activated by other users */
799 del_timer(&cp->timer);
800
801 /* does anybody control me? */
802 if (cp->control)
803 ip_vs_control_del(cp);
804
805 if (cp->flags & IP_VS_CONN_F_NFCT) {
806 ip_vs_conn_drop_conntrack(cp);
807 /* Do not access conntracks during subsys cleanup
808 * because nf_conntrack_find_get can not be used after
809 * conntrack cleanup for the net.
810 */
811 smp_rmb();
812 if (ipvs->enable)
813 ip_vs_conn_drop_conntrack(cp);
814 }
815
816 ip_vs_pe_put(cp->pe);
817 kfree(cp->pe_data);
818 if (unlikely(cp->app != NULL))
819 ip_vs_unbind_app(cp);
820 ip_vs_unbind_dest(cp);
821 if (cp->flags & IP_VS_CONN_F_NO_CPORT)
822 atomic_dec(&ip_vs_conn_no_cport_cnt);
823 atomic_dec(&ipvs->conn_count);
824
825 kmem_cache_free(ip_vs_conn_cachep, cp);
826 return;
827 }
828
829 /* hash it back to the table */
830 ip_vs_conn_hash(cp);
831
832 expire_later:
833 IP_VS_DBG(7, "delayed: conn->refcnt-1=%d conn->n_control=%d\n",
834 atomic_read(&cp->refcnt)-1,
835 atomic_read(&cp->n_control));
836
837 if (ipvs->sync_state & IP_VS_STATE_MASTER)
838 ip_vs_sync_conn(net, cp, sysctl_sync_threshold(ipvs));
839
840 ip_vs_conn_put(cp);
841 }
842
843
844 void ip_vs_conn_expire_now(struct ip_vs_conn *cp)
845 {
846 if (del_timer(&cp->timer))
847 mod_timer(&cp->timer, jiffies);
848 }
849
850
851 /*
852 * Create a new connection entry and hash it into the ip_vs_conn_tab
853 */
854 struct ip_vs_conn *
855 ip_vs_conn_new(const struct ip_vs_conn_param *p,
856 const union nf_inet_addr *daddr, __be16 dport, unsigned int flags,
857 struct ip_vs_dest *dest, __u32 fwmark)
858 {
859 struct ip_vs_conn *cp;
860 struct netns_ipvs *ipvs = net_ipvs(p->net);
861 struct ip_vs_proto_data *pd = ip_vs_proto_data_get(p->net,
862 p->protocol);
863
864 cp = kmem_cache_zalloc(ip_vs_conn_cachep, GFP_ATOMIC);
865 if (cp == NULL) {
866 IP_VS_ERR_RL("%s(): no memory\n", __func__);
867 return NULL;
868 }
869
870 INIT_HLIST_NODE(&cp->c_list);
871 setup_timer(&cp->timer, ip_vs_conn_expire, (unsigned long)cp);
872 ip_vs_conn_net_set(cp, p->net);
873 cp->af = p->af;
874 cp->protocol = p->protocol;
875 ip_vs_addr_copy(p->af, &cp->caddr, p->caddr);
876 cp->cport = p->cport;
877 ip_vs_addr_copy(p->af, &cp->vaddr, p->vaddr);
878 cp->vport = p->vport;
879 /* proto should only be IPPROTO_IP if d_addr is a fwmark */
880 ip_vs_addr_copy(p->protocol == IPPROTO_IP ? AF_UNSPEC : p->af,
881 &cp->daddr, daddr);
882 cp->dport = dport;
883 cp->flags = flags;
884 cp->fwmark = fwmark;
885 if (flags & IP_VS_CONN_F_TEMPLATE && p->pe) {
886 ip_vs_pe_get(p->pe);
887 cp->pe = p->pe;
888 cp->pe_data = p->pe_data;
889 cp->pe_data_len = p->pe_data_len;
890 }
891 spin_lock_init(&cp->lock);
892
893 /*
894 * Set the entry is referenced by the current thread before hashing
895 * it in the table, so that other thread run ip_vs_random_dropentry
896 * but cannot drop this entry.
897 */
898 atomic_set(&cp->refcnt, 1);
899
900 atomic_set(&cp->n_control, 0);
901 atomic_set(&cp->in_pkts, 0);
902
903 atomic_inc(&ipvs->conn_count);
904 if (flags & IP_VS_CONN_F_NO_CPORT)
905 atomic_inc(&ip_vs_conn_no_cport_cnt);
906
907 /* Bind the connection with a destination server */
908 ip_vs_bind_dest(cp, dest);
909
910 /* Set its state and timeout */
911 cp->state = 0;
912 cp->timeout = 3*HZ;
913 cp->sync_endtime = jiffies & ~3UL;
914
915 /* Bind its packet transmitter */
916 #ifdef CONFIG_IP_VS_IPV6
917 if (p->af == AF_INET6)
918 ip_vs_bind_xmit_v6(cp);
919 else
920 #endif
921 ip_vs_bind_xmit(cp);
922
923 if (unlikely(pd && atomic_read(&pd->appcnt)))
924 ip_vs_bind_app(cp, pd->pp);
925
926 /*
927 * Allow conntrack to be preserved. By default, conntrack
928 * is created and destroyed for every packet.
929 * Sometimes keeping conntrack can be useful for
930 * IP_VS_CONN_F_ONE_PACKET too.
931 */
932
933 if (ip_vs_conntrack_enabled(ipvs))
934 cp->flags |= IP_VS_CONN_F_NFCT;
935
936 /* Hash it in the ip_vs_conn_tab finally */
937 ip_vs_conn_hash(cp);
938
939 return cp;
940 }
941
942 /*
943 * /proc/net/ip_vs_conn entries
944 */
945 #ifdef CONFIG_PROC_FS
946 struct ip_vs_iter_state {
947 struct seq_net_private p;
948 struct hlist_head *l;
949 };
950
951 static void *ip_vs_conn_array(struct seq_file *seq, loff_t pos)
952 {
953 int idx;
954 struct ip_vs_conn *cp;
955 struct ip_vs_iter_state *iter = seq->private;
956 struct hlist_node *n;
957
958 for (idx = 0; idx < ip_vs_conn_tab_size; idx++) {
959 ct_read_lock_bh(idx);
960 hlist_for_each_entry(cp, n, &ip_vs_conn_tab[idx], c_list) {
961 if (pos-- == 0) {
962 iter->l = &ip_vs_conn_tab[idx];
963 return cp;
964 }
965 }
966 ct_read_unlock_bh(idx);
967 }
968
969 return NULL;
970 }
971
972 static void *ip_vs_conn_seq_start(struct seq_file *seq, loff_t *pos)
973 {
974 struct ip_vs_iter_state *iter = seq->private;
975
976 iter->l = NULL;
977 return *pos ? ip_vs_conn_array(seq, *pos - 1) :SEQ_START_TOKEN;
978 }
979
980 static void *ip_vs_conn_seq_next(struct seq_file *seq, void *v, loff_t *pos)
981 {
982 struct ip_vs_conn *cp = v;
983 struct ip_vs_iter_state *iter = seq->private;
984 struct hlist_node *e;
985 struct hlist_head *l = iter->l;
986 int idx;
987
988 ++*pos;
989 if (v == SEQ_START_TOKEN)
990 return ip_vs_conn_array(seq, 0);
991
992 /* more on same hash chain? */
993 if ((e = cp->c_list.next))
994 return hlist_entry(e, struct ip_vs_conn, c_list);
995
996 idx = l - ip_vs_conn_tab;
997 ct_read_unlock_bh(idx);
998
999 while (++idx < ip_vs_conn_tab_size) {
1000 ct_read_lock_bh(idx);
1001 hlist_for_each_entry(cp, e, &ip_vs_conn_tab[idx], c_list) {
1002 iter->l = &ip_vs_conn_tab[idx];
1003 return cp;
1004 }
1005 ct_read_unlock_bh(idx);
1006 }
1007 iter->l = NULL;
1008 return NULL;
1009 }
1010
1011 static void ip_vs_conn_seq_stop(struct seq_file *seq, void *v)
1012 {
1013 struct ip_vs_iter_state *iter = seq->private;
1014 struct hlist_head *l = iter->l;
1015
1016 if (l)
1017 ct_read_unlock_bh(l - ip_vs_conn_tab);
1018 }
1019
1020 static int ip_vs_conn_seq_show(struct seq_file *seq, void *v)
1021 {
1022
1023 if (v == SEQ_START_TOKEN)
1024 seq_puts(seq,
1025 "Pro FromIP FPrt ToIP TPrt DestIP DPrt State Expires PEName PEData\n");
1026 else {
1027 const struct ip_vs_conn *cp = v;
1028 struct net *net = seq_file_net(seq);
1029 char pe_data[IP_VS_PENAME_MAXLEN + IP_VS_PEDATA_MAXLEN + 3];
1030 size_t len = 0;
1031
1032 if (!ip_vs_conn_net_eq(cp, net))
1033 return 0;
1034 if (cp->pe_data) {
1035 pe_data[0] = ' ';
1036 len = strlen(cp->pe->name);
1037 memcpy(pe_data + 1, cp->pe->name, len);
1038 pe_data[len + 1] = ' ';
1039 len += 2;
1040 len += cp->pe->show_pe_data(cp, pe_data + len);
1041 }
1042 pe_data[len] = '\0';
1043
1044 #ifdef CONFIG_IP_VS_IPV6
1045 if (cp->af == AF_INET6)
1046 seq_printf(seq, "%-3s %pI6 %04X %pI6 %04X "
1047 "%pI6 %04X %-11s %7lu%s\n",
1048 ip_vs_proto_name(cp->protocol),
1049 &cp->caddr.in6, ntohs(cp->cport),
1050 &cp->vaddr.in6, ntohs(cp->vport),
1051 &cp->daddr.in6, ntohs(cp->dport),
1052 ip_vs_state_name(cp->protocol, cp->state),
1053 (cp->timer.expires-jiffies)/HZ, pe_data);
1054 else
1055 #endif
1056 seq_printf(seq,
1057 "%-3s %08X %04X %08X %04X"
1058 " %08X %04X %-11s %7lu%s\n",
1059 ip_vs_proto_name(cp->protocol),
1060 ntohl(cp->caddr.ip), ntohs(cp->cport),
1061 ntohl(cp->vaddr.ip), ntohs(cp->vport),
1062 ntohl(cp->daddr.ip), ntohs(cp->dport),
1063 ip_vs_state_name(cp->protocol, cp->state),
1064 (cp->timer.expires-jiffies)/HZ, pe_data);
1065 }
1066 return 0;
1067 }
1068
1069 static const struct seq_operations ip_vs_conn_seq_ops = {
1070 .start = ip_vs_conn_seq_start,
1071 .next = ip_vs_conn_seq_next,
1072 .stop = ip_vs_conn_seq_stop,
1073 .show = ip_vs_conn_seq_show,
1074 };
1075
1076 static int ip_vs_conn_open(struct inode *inode, struct file *file)
1077 {
1078 return seq_open_net(inode, file, &ip_vs_conn_seq_ops,
1079 sizeof(struct ip_vs_iter_state));
1080 }
1081
1082 static const struct file_operations ip_vs_conn_fops = {
1083 .owner = THIS_MODULE,
1084 .open = ip_vs_conn_open,
1085 .read = seq_read,
1086 .llseek = seq_lseek,
1087 .release = seq_release_net,
1088 };
1089
1090 static const char *ip_vs_origin_name(unsigned int flags)
1091 {
1092 if (flags & IP_VS_CONN_F_SYNC)
1093 return "SYNC";
1094 else
1095 return "LOCAL";
1096 }
1097
1098 static int ip_vs_conn_sync_seq_show(struct seq_file *seq, void *v)
1099 {
1100
1101 if (v == SEQ_START_TOKEN)
1102 seq_puts(seq,
1103 "Pro FromIP FPrt ToIP TPrt DestIP DPrt State Origin Expires\n");
1104 else {
1105 const struct ip_vs_conn *cp = v;
1106 struct net *net = seq_file_net(seq);
1107
1108 if (!ip_vs_conn_net_eq(cp, net))
1109 return 0;
1110
1111 #ifdef CONFIG_IP_VS_IPV6
1112 if (cp->af == AF_INET6)
1113 seq_printf(seq, "%-3s %pI6 %04X %pI6 %04X %pI6 %04X %-11s %-6s %7lu\n",
1114 ip_vs_proto_name(cp->protocol),
1115 &cp->caddr.in6, ntohs(cp->cport),
1116 &cp->vaddr.in6, ntohs(cp->vport),
1117 &cp->daddr.in6, ntohs(cp->dport),
1118 ip_vs_state_name(cp->protocol, cp->state),
1119 ip_vs_origin_name(cp->flags),
1120 (cp->timer.expires-jiffies)/HZ);
1121 else
1122 #endif
1123 seq_printf(seq,
1124 "%-3s %08X %04X %08X %04X "
1125 "%08X %04X %-11s %-6s %7lu\n",
1126 ip_vs_proto_name(cp->protocol),
1127 ntohl(cp->caddr.ip), ntohs(cp->cport),
1128 ntohl(cp->vaddr.ip), ntohs(cp->vport),
1129 ntohl(cp->daddr.ip), ntohs(cp->dport),
1130 ip_vs_state_name(cp->protocol, cp->state),
1131 ip_vs_origin_name(cp->flags),
1132 (cp->timer.expires-jiffies)/HZ);
1133 }
1134 return 0;
1135 }
1136
1137 static const struct seq_operations ip_vs_conn_sync_seq_ops = {
1138 .start = ip_vs_conn_seq_start,
1139 .next = ip_vs_conn_seq_next,
1140 .stop = ip_vs_conn_seq_stop,
1141 .show = ip_vs_conn_sync_seq_show,
1142 };
1143
1144 static int ip_vs_conn_sync_open(struct inode *inode, struct file *file)
1145 {
1146 return seq_open_net(inode, file, &ip_vs_conn_sync_seq_ops,
1147 sizeof(struct ip_vs_iter_state));
1148 }
1149
1150 static const struct file_operations ip_vs_conn_sync_fops = {
1151 .owner = THIS_MODULE,
1152 .open = ip_vs_conn_sync_open,
1153 .read = seq_read,
1154 .llseek = seq_lseek,
1155 .release = seq_release_net,
1156 };
1157
1158 #endif
1159
1160
1161 /*
1162 * Randomly drop connection entries before running out of memory
1163 */
1164 static inline int todrop_entry(struct ip_vs_conn *cp)
1165 {
1166 /*
1167 * The drop rate array needs tuning for real environments.
1168 * Called from timer bh only => no locking
1169 */
1170 static const char todrop_rate[9] = {0, 1, 2, 3, 4, 5, 6, 7, 8};
1171 static char todrop_counter[9] = {0};
1172 int i;
1173
1174 /* if the conn entry hasn't lasted for 60 seconds, don't drop it.
1175 This will leave enough time for normal connection to get
1176 through. */
1177 if (time_before(cp->timeout + jiffies, cp->timer.expires + 60*HZ))
1178 return 0;
1179
1180 /* Don't drop the entry if its number of incoming packets is not
1181 located in [0, 8] */
1182 i = atomic_read(&cp->in_pkts);
1183 if (i > 8 || i < 0) return 0;
1184
1185 if (!todrop_rate[i]) return 0;
1186 if (--todrop_counter[i] > 0) return 0;
1187
1188 todrop_counter[i] = todrop_rate[i];
1189 return 1;
1190 }
1191
1192 /* Called from keventd and must protect itself from softirqs */
1193 void ip_vs_random_dropentry(struct net *net)
1194 {
1195 int idx;
1196 struct ip_vs_conn *cp;
1197
1198 /*
1199 * Randomly scan 1/32 of the whole table every second
1200 */
1201 for (idx = 0; idx < (ip_vs_conn_tab_size>>5); idx++) {
1202 unsigned int hash = net_random() & ip_vs_conn_tab_mask;
1203 struct hlist_node *n;
1204
1205 /*
1206 * Lock is actually needed in this loop.
1207 */
1208 ct_write_lock_bh(hash);
1209
1210 hlist_for_each_entry(cp, n, &ip_vs_conn_tab[hash], c_list) {
1211 if (cp->flags & IP_VS_CONN_F_TEMPLATE)
1212 /* connection template */
1213 continue;
1214 if (!ip_vs_conn_net_eq(cp, net))
1215 continue;
1216 if (cp->protocol == IPPROTO_TCP) {
1217 switch(cp->state) {
1218 case IP_VS_TCP_S_SYN_RECV:
1219 case IP_VS_TCP_S_SYNACK:
1220 break;
1221
1222 case IP_VS_TCP_S_ESTABLISHED:
1223 if (todrop_entry(cp))
1224 break;
1225 continue;
1226
1227 default:
1228 continue;
1229 }
1230 } else {
1231 if (!todrop_entry(cp))
1232 continue;
1233 }
1234
1235 IP_VS_DBG(4, "del connection\n");
1236 ip_vs_conn_expire_now(cp);
1237 if (cp->control) {
1238 IP_VS_DBG(4, "del conn template\n");
1239 ip_vs_conn_expire_now(cp->control);
1240 }
1241 }
1242 ct_write_unlock_bh(hash);
1243 }
1244 }
1245
1246
1247 /*
1248 * Flush all the connection entries in the ip_vs_conn_tab
1249 */
1250 static void ip_vs_conn_flush(struct net *net)
1251 {
1252 int idx;
1253 struct ip_vs_conn *cp;
1254 struct netns_ipvs *ipvs = net_ipvs(net);
1255
1256 flush_again:
1257 for (idx = 0; idx < ip_vs_conn_tab_size; idx++) {
1258 struct hlist_node *n;
1259
1260 /*
1261 * Lock is actually needed in this loop.
1262 */
1263 ct_write_lock_bh(idx);
1264
1265 hlist_for_each_entry(cp, n, &ip_vs_conn_tab[idx], c_list) {
1266 if (!ip_vs_conn_net_eq(cp, net))
1267 continue;
1268 IP_VS_DBG(4, "del connection\n");
1269 ip_vs_conn_expire_now(cp);
1270 if (cp->control) {
1271 IP_VS_DBG(4, "del conn template\n");
1272 ip_vs_conn_expire_now(cp->control);
1273 }
1274 }
1275 ct_write_unlock_bh(idx);
1276 }
1277
1278 /* the counter may be not NULL, because maybe some conn entries
1279 are run by slow timer handler or unhashed but still referred */
1280 if (atomic_read(&ipvs->conn_count) != 0) {
1281 schedule();
1282 goto flush_again;
1283 }
1284 }
1285 /*
1286 * per netns init and exit
1287 */
1288 int __net_init ip_vs_conn_net_init(struct net *net)
1289 {
1290 struct netns_ipvs *ipvs = net_ipvs(net);
1291
1292 atomic_set(&ipvs->conn_count, 0);
1293
1294 proc_create("ip_vs_conn", 0, net->proc_net, &ip_vs_conn_fops);
1295 proc_create("ip_vs_conn_sync", 0, net->proc_net, &ip_vs_conn_sync_fops);
1296 return 0;
1297 }
1298
1299 void __net_exit ip_vs_conn_net_cleanup(struct net *net)
1300 {
1301 /* flush all the connection entries first */
1302 ip_vs_conn_flush(net);
1303 remove_proc_entry("ip_vs_conn", net->proc_net);
1304 remove_proc_entry("ip_vs_conn_sync", net->proc_net);
1305 }
1306
1307 int __init ip_vs_conn_init(void)
1308 {
1309 int idx;
1310
1311 /* Compute size and mask */
1312 ip_vs_conn_tab_size = 1 << ip_vs_conn_tab_bits;
1313 ip_vs_conn_tab_mask = ip_vs_conn_tab_size - 1;
1314
1315 /*
1316 * Allocate the connection hash table and initialize its list heads
1317 */
1318 ip_vs_conn_tab = vmalloc(ip_vs_conn_tab_size * sizeof(*ip_vs_conn_tab));
1319 if (!ip_vs_conn_tab)
1320 return -ENOMEM;
1321
1322 /* Allocate ip_vs_conn slab cache */
1323 ip_vs_conn_cachep = kmem_cache_create("ip_vs_conn",
1324 sizeof(struct ip_vs_conn), 0,
1325 SLAB_HWCACHE_ALIGN, NULL);
1326 if (!ip_vs_conn_cachep) {
1327 vfree(ip_vs_conn_tab);
1328 return -ENOMEM;
1329 }
1330
1331 pr_info("Connection hash table configured "
1332 "(size=%d, memory=%ldKbytes)\n",
1333 ip_vs_conn_tab_size,
1334 (long)(ip_vs_conn_tab_size*sizeof(struct list_head))/1024);
1335 IP_VS_DBG(0, "Each connection entry needs %Zd bytes at least\n",
1336 sizeof(struct ip_vs_conn));
1337
1338 for (idx = 0; idx < ip_vs_conn_tab_size; idx++)
1339 INIT_HLIST_HEAD(&ip_vs_conn_tab[idx]);
1340
1341 for (idx = 0; idx < CT_LOCKARRAY_SIZE; idx++) {
1342 rwlock_init(&__ip_vs_conntbl_lock_array[idx].l);
1343 }
1344
1345 /* calculate the random value for connection hash */
1346 get_random_bytes(&ip_vs_conn_rnd, sizeof(ip_vs_conn_rnd));
1347
1348 return 0;
1349 }
1350
1351 void ip_vs_conn_cleanup(void)
1352 {
1353 /* Release the empty cache */
1354 kmem_cache_destroy(ip_vs_conn_cachep);
1355 vfree(ip_vs_conn_tab);
1356 }
Linux kernel - Deliverables
This page took 0.082873 seconds and 6 git commands to generate.