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authorJulius Volz <juliusv@google.com>2008-09-19 06:32:57 -0400
committerSimon Horman <horms@verge.net.au>2008-10-06 17:38:24 -0400
commitcb7f6a7b716e801097b564dec3ccb58d330aef56 (patch)
tree92fa8fa5381e04576c43eab88874ab54ea670767 /net/ipv4/ipvs/ip_vs_conn.c
parent8d5803bf6fbe5264000afc8c34bff08e8ecc023b (diff)
IPVS: Move IPVS to net/netfilter/ipvs
Since IPVS now has partial IPv6 support, this patch moves IPVS from net/ipv4/ipvs to net/netfilter/ipvs. It's a result of: $ git mv net/ipv4/ipvs net/netfilter and adapting the relevant Kconfigs/Makefiles to the new path. Signed-off-by: Julius Volz <juliusv@google.com> Signed-off-by: Simon Horman <horms@verge.net.au>
Diffstat (limited to 'net/ipv4/ipvs/ip_vs_conn.c')
-rw-r--r--net/ipv4/ipvs/ip_vs_conn.c1110
1 files changed, 0 insertions, 1110 deletions
diff --git a/net/ipv4/ipvs/ip_vs_conn.c b/net/ipv4/ipvs/ip_vs_conn.c
deleted file mode 100644
index 9a24332fbed8..000000000000
--- a/net/ipv4/ipvs/ip_vs_conn.c
+++ /dev/null
@@ -1,1110 +0,0 @@
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#include <linux/interrupt.h>
26#include <linux/in.h>
27#include <linux/net.h>
28#include <linux/kernel.h>
29#include <linux/module.h>
30#include <linux/vmalloc.h>
31#include <linux/proc_fs.h> /* for proc_net_* */
32#include <linux/seq_file.h>
33#include <linux/jhash.h>
34#include <linux/random.h>
35
36#include <net/net_namespace.h>
37#include <net/ip_vs.h>
38
39
40/*
41 * Connection hash table: for input and output packets lookups of IPVS
42 */
43static struct list_head *ip_vs_conn_tab;
44
45/* SLAB cache for IPVS connections */
46static struct kmem_cache *ip_vs_conn_cachep __read_mostly;
47
48/* counter for current IPVS connections */
49static atomic_t ip_vs_conn_count = ATOMIC_INIT(0);
50
51/* counter for no client port connections */
52static atomic_t ip_vs_conn_no_cport_cnt = ATOMIC_INIT(0);
53
54/* random value for IPVS connection hash */
55static unsigned int ip_vs_conn_rnd;
56
57/*
58 * Fine locking granularity for big connection hash table
59 */
60#define CT_LOCKARRAY_BITS 4
61#define CT_LOCKARRAY_SIZE (1<<CT_LOCKARRAY_BITS)
62#define CT_LOCKARRAY_MASK (CT_LOCKARRAY_SIZE-1)
63
64struct ip_vs_aligned_lock
65{
66 rwlock_t l;
67} __attribute__((__aligned__(SMP_CACHE_BYTES)));
68
69/* lock array for conn table */
70static struct ip_vs_aligned_lock
71__ip_vs_conntbl_lock_array[CT_LOCKARRAY_SIZE] __cacheline_aligned;
72
73static inline void ct_read_lock(unsigned key)
74{
75 read_lock(&__ip_vs_conntbl_lock_array[key&CT_LOCKARRAY_MASK].l);
76}
77
78static inline void ct_read_unlock(unsigned key)
79{
80 read_unlock(&__ip_vs_conntbl_lock_array[key&CT_LOCKARRAY_MASK].l);
81}
82
83static inline void ct_write_lock(unsigned key)
84{
85 write_lock(&__ip_vs_conntbl_lock_array[key&CT_LOCKARRAY_MASK].l);
86}
87
88static inline void ct_write_unlock(unsigned key)
89{
90 write_unlock(&__ip_vs_conntbl_lock_array[key&CT_LOCKARRAY_MASK].l);
91}
92
93static inline void ct_read_lock_bh(unsigned key)
94{
95 read_lock_bh(&__ip_vs_conntbl_lock_array[key&CT_LOCKARRAY_MASK].l);
96}
97
98static inline void ct_read_unlock_bh(unsigned key)
99{
100 read_unlock_bh(&__ip_vs_conntbl_lock_array[key&CT_LOCKARRAY_MASK].l);
101}
102
103static inline void ct_write_lock_bh(unsigned key)
104{
105 write_lock_bh(&__ip_vs_conntbl_lock_array[key&CT_LOCKARRAY_MASK].l);
106}
107
108static inline void ct_write_unlock_bh(unsigned key)
109{
110 write_unlock_bh(&__ip_vs_conntbl_lock_array[key&CT_LOCKARRAY_MASK].l);
111}
112
113
114/*
115 * Returns hash value for IPVS connection entry
116 */
117static unsigned int ip_vs_conn_hashkey(int af, unsigned proto,
118 const union nf_inet_addr *addr,
119 __be16 port)
120{
121#ifdef CONFIG_IP_VS_IPV6
122 if (af == AF_INET6)
123 return jhash_3words(jhash(addr, 16, ip_vs_conn_rnd),
124 (__force u32)port, proto, ip_vs_conn_rnd)
125 & IP_VS_CONN_TAB_MASK;
126#endif
127 return jhash_3words((__force u32)addr->ip, (__force u32)port, proto,
128 ip_vs_conn_rnd)
129 & IP_VS_CONN_TAB_MASK;
130}
131
132
133/*
134 * Hashes ip_vs_conn in ip_vs_conn_tab by proto,addr,port.
135 * returns bool success.
136 */
137static inline int ip_vs_conn_hash(struct ip_vs_conn *cp)
138{
139 unsigned hash;
140 int ret;
141
142 /* Hash by protocol, client address and port */
143 hash = ip_vs_conn_hashkey(cp->af, cp->protocol, &cp->caddr, cp->cport);
144
145 ct_write_lock(hash);
146
147 if (!(cp->flags & IP_VS_CONN_F_HASHED)) {
148 list_add(&cp->c_list, &ip_vs_conn_tab[hash]);
149 cp->flags |= IP_VS_CONN_F_HASHED;
150 atomic_inc(&cp->refcnt);
151 ret = 1;
152 } else {
153 IP_VS_ERR("ip_vs_conn_hash(): request for already hashed, "
154 "called from %p\n", __builtin_return_address(0));
155 ret = 0;
156 }
157
158 ct_write_unlock(hash);
159
160 return ret;
161}
162
163
164/*
165 * UNhashes ip_vs_conn from ip_vs_conn_tab.
166 * returns bool success.
167 */
168static inline int ip_vs_conn_unhash(struct ip_vs_conn *cp)
169{
170 unsigned hash;
171 int ret;
172
173 /* unhash it and decrease its reference counter */
174 hash = ip_vs_conn_hashkey(cp->af, cp->protocol, &cp->caddr, cp->cport);
175
176 ct_write_lock(hash);
177
178 if (cp->flags & IP_VS_CONN_F_HASHED) {
179 list_del(&cp->c_list);
180 cp->flags &= ~IP_VS_CONN_F_HASHED;
181 atomic_dec(&cp->refcnt);
182 ret = 1;
183 } else
184 ret = 0;
185
186 ct_write_unlock(hash);
187
188 return ret;
189}
190
191
192/*
193 * Gets ip_vs_conn associated with supplied parameters in the ip_vs_conn_tab.
194 * Called for pkts coming from OUTside-to-INside.
195 * s_addr, s_port: pkt source address (foreign host)
196 * d_addr, d_port: pkt dest address (load balancer)
197 */
198static inline struct ip_vs_conn *__ip_vs_conn_in_get
199(int af, int protocol, const union nf_inet_addr *s_addr, __be16 s_port,
200 const union nf_inet_addr *d_addr, __be16 d_port)
201{
202 unsigned hash;
203 struct ip_vs_conn *cp;
204
205 hash = ip_vs_conn_hashkey(af, protocol, s_addr, s_port);
206
207 ct_read_lock(hash);
208
209 list_for_each_entry(cp, &ip_vs_conn_tab[hash], c_list) {
210 if (cp->af == af &&
211 ip_vs_addr_equal(af, s_addr, &cp->caddr) &&
212 ip_vs_addr_equal(af, d_addr, &cp->vaddr) &&
213 s_port == cp->cport && d_port == cp->vport &&
214 ((!s_port) ^ (!(cp->flags & IP_VS_CONN_F_NO_CPORT))) &&
215 protocol == cp->protocol) {
216 /* HIT */
217 atomic_inc(&cp->refcnt);
218 ct_read_unlock(hash);
219 return cp;
220 }
221 }
222
223 ct_read_unlock(hash);
224
225 return NULL;
226}
227
228struct ip_vs_conn *ip_vs_conn_in_get
229(int af, int protocol, const union nf_inet_addr *s_addr, __be16 s_port,
230 const union nf_inet_addr *d_addr, __be16 d_port)
231{
232 struct ip_vs_conn *cp;
233
234 cp = __ip_vs_conn_in_get(af, protocol, s_addr, s_port, d_addr, d_port);
235 if (!cp && atomic_read(&ip_vs_conn_no_cport_cnt))
236 cp = __ip_vs_conn_in_get(af, protocol, s_addr, 0, d_addr,
237 d_port);
238
239 IP_VS_DBG_BUF(9, "lookup/in %s %s:%d->%s:%d %s\n",
240 ip_vs_proto_name(protocol),
241 IP_VS_DBG_ADDR(af, s_addr), ntohs(s_port),
242 IP_VS_DBG_ADDR(af, d_addr), ntohs(d_port),
243 cp ? "hit" : "not hit");
244
245 return cp;
246}
247
248/* Get reference to connection template */
249struct ip_vs_conn *ip_vs_ct_in_get
250(int af, int protocol, const union nf_inet_addr *s_addr, __be16 s_port,
251 const union nf_inet_addr *d_addr, __be16 d_port)
252{
253 unsigned hash;
254 struct ip_vs_conn *cp;
255
256 hash = ip_vs_conn_hashkey(af, protocol, s_addr, s_port);
257
258 ct_read_lock(hash);
259
260 list_for_each_entry(cp, &ip_vs_conn_tab[hash], c_list) {
261 if (cp->af == af &&
262 ip_vs_addr_equal(af, s_addr, &cp->caddr) &&
263 ip_vs_addr_equal(af, d_addr, &cp->vaddr) &&
264 s_port == cp->cport && d_port == cp->vport &&
265 cp->flags & IP_VS_CONN_F_TEMPLATE &&
266 protocol == cp->protocol) {
267 /* HIT */
268 atomic_inc(&cp->refcnt);
269 goto out;
270 }
271 }
272 cp = NULL;
273
274 out:
275 ct_read_unlock(hash);
276
277 IP_VS_DBG_BUF(9, "template lookup/in %s %s:%d->%s:%d %s\n",
278 ip_vs_proto_name(protocol),
279 IP_VS_DBG_ADDR(af, s_addr), ntohs(s_port),
280 IP_VS_DBG_ADDR(af, d_addr), ntohs(d_port),
281 cp ? "hit" : "not hit");
282
283 return cp;
284}
285
286/*
287 * Gets ip_vs_conn associated with supplied parameters in the ip_vs_conn_tab.
288 * Called for pkts coming from inside-to-OUTside.
289 * s_addr, s_port: pkt source address (inside host)
290 * d_addr, d_port: pkt dest address (foreign host)
291 */
292struct ip_vs_conn *ip_vs_conn_out_get
293(int af, int protocol, const union nf_inet_addr *s_addr, __be16 s_port,
294 const union nf_inet_addr *d_addr, __be16 d_port)
295{
296 unsigned hash;
297 struct ip_vs_conn *cp, *ret=NULL;
298
299 /*
300 * Check for "full" addressed entries
301 */
302 hash = ip_vs_conn_hashkey(af, protocol, d_addr, d_port);
303
304 ct_read_lock(hash);
305
306 list_for_each_entry(cp, &ip_vs_conn_tab[hash], c_list) {
307 if (cp->af == af &&
308 ip_vs_addr_equal(af, d_addr, &cp->caddr) &&
309 ip_vs_addr_equal(af, s_addr, &cp->daddr) &&
310 d_port == cp->cport && s_port == cp->dport &&
311 protocol == cp->protocol) {
312 /* HIT */
313 atomic_inc(&cp->refcnt);
314 ret = cp;
315 break;
316 }
317 }
318
319 ct_read_unlock(hash);
320
321 IP_VS_DBG_BUF(9, "lookup/out %s %s:%d->%s:%d %s\n",
322 ip_vs_proto_name(protocol),
323 IP_VS_DBG_ADDR(af, s_addr), ntohs(s_port),
324 IP_VS_DBG_ADDR(af, d_addr), ntohs(d_port),
325 ret ? "hit" : "not hit");
326
327 return ret;
328}
329
330
331/*
332 * Put back the conn and restart its timer with its timeout
333 */
334void ip_vs_conn_put(struct ip_vs_conn *cp)
335{
336 /* reset it expire in its timeout */
337 mod_timer(&cp->timer, jiffies+cp->timeout);
338
339 __ip_vs_conn_put(cp);
340}
341
342
343/*
344 * Fill a no_client_port connection with a client port number
345 */
346void ip_vs_conn_fill_cport(struct ip_vs_conn *cp, __be16 cport)
347{
348 if (ip_vs_conn_unhash(cp)) {
349 spin_lock(&cp->lock);
350 if (cp->flags & IP_VS_CONN_F_NO_CPORT) {
351 atomic_dec(&ip_vs_conn_no_cport_cnt);
352 cp->flags &= ~IP_VS_CONN_F_NO_CPORT;
353 cp->cport = cport;
354 }
355 spin_unlock(&cp->lock);
356
357 /* hash on new dport */
358 ip_vs_conn_hash(cp);
359 }
360}
361
362
363/*
364 * Bind a connection entry with the corresponding packet_xmit.
365 * Called by ip_vs_conn_new.
366 */
367static inline void ip_vs_bind_xmit(struct ip_vs_conn *cp)
368{
369 switch (IP_VS_FWD_METHOD(cp)) {
370 case IP_VS_CONN_F_MASQ:
371 cp->packet_xmit = ip_vs_nat_xmit;
372 break;
373
374 case IP_VS_CONN_F_TUNNEL:
375 cp->packet_xmit = ip_vs_tunnel_xmit;
376 break;
377
378 case IP_VS_CONN_F_DROUTE:
379 cp->packet_xmit = ip_vs_dr_xmit;
380 break;
381
382 case IP_VS_CONN_F_LOCALNODE:
383 cp->packet_xmit = ip_vs_null_xmit;
384 break;
385
386 case IP_VS_CONN_F_BYPASS:
387 cp->packet_xmit = ip_vs_bypass_xmit;
388 break;
389 }
390}
391
392#ifdef CONFIG_IP_VS_IPV6
393static inline void ip_vs_bind_xmit_v6(struct ip_vs_conn *cp)
394{
395 switch (IP_VS_FWD_METHOD(cp)) {
396 case IP_VS_CONN_F_MASQ:
397 cp->packet_xmit = ip_vs_nat_xmit_v6;
398 break;
399
400 case IP_VS_CONN_F_TUNNEL:
401 cp->packet_xmit = ip_vs_tunnel_xmit_v6;
402 break;
403
404 case IP_VS_CONN_F_DROUTE:
405 cp->packet_xmit = ip_vs_dr_xmit_v6;
406 break;
407
408 case IP_VS_CONN_F_LOCALNODE:
409 cp->packet_xmit = ip_vs_null_xmit;
410 break;
411
412 case IP_VS_CONN_F_BYPASS:
413 cp->packet_xmit = ip_vs_bypass_xmit_v6;
414 break;
415 }
416}
417#endif
418
419
420static inline int ip_vs_dest_totalconns(struct ip_vs_dest *dest)
421{
422 return atomic_read(&dest->activeconns)
423 + atomic_read(&dest->inactconns);
424}
425
426/*
427 * Bind a connection entry with a virtual service destination
428 * Called just after a new connection entry is created.
429 */
430static inline void
431ip_vs_bind_dest(struct ip_vs_conn *cp, struct ip_vs_dest *dest)
432{
433 /* if dest is NULL, then return directly */
434 if (!dest)
435 return;
436
437 /* Increase the refcnt counter of the dest */
438 atomic_inc(&dest->refcnt);
439
440 /* Bind with the destination and its corresponding transmitter */
441 if ((cp->flags & IP_VS_CONN_F_SYNC) &&
442 (!(cp->flags & IP_VS_CONN_F_TEMPLATE)))
443 /* if the connection is not template and is created
444 * by sync, preserve the activity flag.
445 */
446 cp->flags |= atomic_read(&dest->conn_flags) &
447 (~IP_VS_CONN_F_INACTIVE);
448 else
449 cp->flags |= atomic_read(&dest->conn_flags);
450 cp->dest = dest;
451
452 IP_VS_DBG_BUF(7, "Bind-dest %s c:%s:%d v:%s:%d "
453 "d:%s:%d fwd:%c s:%u conn->flags:%X conn->refcnt:%d "
454 "dest->refcnt:%d\n",
455 ip_vs_proto_name(cp->protocol),
456 IP_VS_DBG_ADDR(cp->af, &cp->caddr), ntohs(cp->cport),
457 IP_VS_DBG_ADDR(cp->af, &cp->vaddr), ntohs(cp->vport),
458 IP_VS_DBG_ADDR(cp->af, &cp->daddr), ntohs(cp->dport),
459 ip_vs_fwd_tag(cp), cp->state,
460 cp->flags, atomic_read(&cp->refcnt),
461 atomic_read(&dest->refcnt));
462
463 /* Update the connection counters */
464 if (!(cp->flags & IP_VS_CONN_F_TEMPLATE)) {
465 /* It is a normal connection, so increase the inactive
466 connection counter because it is in TCP SYNRECV
467 state (inactive) or other protocol inacive state */
468 if ((cp->flags & IP_VS_CONN_F_SYNC) &&
469 (!(cp->flags & IP_VS_CONN_F_INACTIVE)))
470 atomic_inc(&dest->activeconns);
471 else
472 atomic_inc(&dest->inactconns);
473 } else {
474 /* It is a persistent connection/template, so increase
475 the peristent connection counter */
476 atomic_inc(&dest->persistconns);
477 }
478
479 if (dest->u_threshold != 0 &&
480 ip_vs_dest_totalconns(dest) >= dest->u_threshold)
481 dest->flags |= IP_VS_DEST_F_OVERLOAD;
482}
483
484
485/*
486 * Check if there is a destination for the connection, if so
487 * bind the connection to the destination.
488 */
489struct ip_vs_dest *ip_vs_try_bind_dest(struct ip_vs_conn *cp)
490{
491 struct ip_vs_dest *dest;
492
493 if ((cp) && (!cp->dest)) {
494 dest = ip_vs_find_dest(cp->af, &cp->daddr, cp->dport,
495 &cp->vaddr, cp->vport,
496 cp->protocol);
497 ip_vs_bind_dest(cp, dest);
498 return dest;
499 } else
500 return NULL;
501}
502
503
504/*
505 * Unbind a connection entry with its VS destination
506 * Called by the ip_vs_conn_expire function.
507 */
508static inline void ip_vs_unbind_dest(struct ip_vs_conn *cp)
509{
510 struct ip_vs_dest *dest = cp->dest;
511
512 if (!dest)
513 return;
514
515 IP_VS_DBG_BUF(7, "Unbind-dest %s c:%s:%d v:%s:%d "
516 "d:%s:%d fwd:%c s:%u conn->flags:%X conn->refcnt:%d "
517 "dest->refcnt:%d\n",
518 ip_vs_proto_name(cp->protocol),
519 IP_VS_DBG_ADDR(cp->af, &cp->caddr), ntohs(cp->cport),
520 IP_VS_DBG_ADDR(cp->af, &cp->vaddr), ntohs(cp->vport),
521 IP_VS_DBG_ADDR(cp->af, &cp->daddr), ntohs(cp->dport),
522 ip_vs_fwd_tag(cp), cp->state,
523 cp->flags, atomic_read(&cp->refcnt),
524 atomic_read(&dest->refcnt));
525
526 /* Update the connection counters */
527 if (!(cp->flags & IP_VS_CONN_F_TEMPLATE)) {
528 /* It is a normal connection, so decrease the inactconns
529 or activeconns counter */
530 if (cp->flags & IP_VS_CONN_F_INACTIVE) {
531 atomic_dec(&dest->inactconns);
532 } else {
533 atomic_dec(&dest->activeconns);
534 }
535 } else {
536 /* It is a persistent connection/template, so decrease
537 the peristent connection counter */
538 atomic_dec(&dest->persistconns);
539 }
540
541 if (dest->l_threshold != 0) {
542 if (ip_vs_dest_totalconns(dest) < dest->l_threshold)
543 dest->flags &= ~IP_VS_DEST_F_OVERLOAD;
544 } else if (dest->u_threshold != 0) {
545 if (ip_vs_dest_totalconns(dest) * 4 < dest->u_threshold * 3)
546 dest->flags &= ~IP_VS_DEST_F_OVERLOAD;
547 } else {
548 if (dest->flags & IP_VS_DEST_F_OVERLOAD)
549 dest->flags &= ~IP_VS_DEST_F_OVERLOAD;
550 }
551
552 /*
553 * Simply decrease the refcnt of the dest, because the
554 * dest will be either in service's destination list
555 * or in the trash.
556 */
557 atomic_dec(&dest->refcnt);
558}
559
560
561/*
562 * Checking if the destination of a connection template is available.
563 * If available, return 1, otherwise invalidate this connection
564 * template and return 0.
565 */
566int ip_vs_check_template(struct ip_vs_conn *ct)
567{
568 struct ip_vs_dest *dest = ct->dest;
569
570 /*
571 * Checking the dest server status.
572 */
573 if ((dest == NULL) ||
574 !(dest->flags & IP_VS_DEST_F_AVAILABLE) ||
575 (sysctl_ip_vs_expire_quiescent_template &&
576 (atomic_read(&dest->weight) == 0))) {
577 IP_VS_DBG_BUF(9, "check_template: dest not available for "
578 "protocol %s s:%s:%d v:%s:%d "
579 "-> d:%s:%d\n",
580 ip_vs_proto_name(ct->protocol),
581 IP_VS_DBG_ADDR(ct->af, &ct->caddr),
582 ntohs(ct->cport),
583 IP_VS_DBG_ADDR(ct->af, &ct->vaddr),
584 ntohs(ct->vport),
585 IP_VS_DBG_ADDR(ct->af, &ct->daddr),
586 ntohs(ct->dport));
587
588 /*
589 * Invalidate the connection template
590 */
591 if (ct->vport != htons(0xffff)) {
592 if (ip_vs_conn_unhash(ct)) {
593 ct->dport = htons(0xffff);
594 ct->vport = htons(0xffff);
595 ct->cport = 0;
596 ip_vs_conn_hash(ct);
597 }
598 }
599
600 /*
601 * Simply decrease the refcnt of the template,
602 * don't restart its timer.
603 */
604 atomic_dec(&ct->refcnt);
605 return 0;
606 }
607 return 1;
608}
609
610static void ip_vs_conn_expire(unsigned long data)
611{
612 struct ip_vs_conn *cp = (struct ip_vs_conn *)data;
613
614 cp->timeout = 60*HZ;
615
616 /*
617 * hey, I'm using it
618 */
619 atomic_inc(&cp->refcnt);
620
621 /*
622 * do I control anybody?
623 */
624 if (atomic_read(&cp->n_control))
625 goto expire_later;
626
627 /*
628 * unhash it if it is hashed in the conn table
629 */
630 if (!ip_vs_conn_unhash(cp))
631 goto expire_later;
632
633 /*
634 * refcnt==1 implies I'm the only one referrer
635 */
636 if (likely(atomic_read(&cp->refcnt) == 1)) {
637 /* delete the timer if it is activated by other users */
638 if (timer_pending(&cp->timer))
639 del_timer(&cp->timer);
640
641 /* does anybody control me? */
642 if (cp->control)
643 ip_vs_control_del(cp);
644
645 if (unlikely(cp->app != NULL))
646 ip_vs_unbind_app(cp);
647 ip_vs_unbind_dest(cp);
648 if (cp->flags & IP_VS_CONN_F_NO_CPORT)
649 atomic_dec(&ip_vs_conn_no_cport_cnt);
650 atomic_dec(&ip_vs_conn_count);
651
652 kmem_cache_free(ip_vs_conn_cachep, cp);
653 return;
654 }
655
656 /* hash it back to the table */
657 ip_vs_conn_hash(cp);
658
659 expire_later:
660 IP_VS_DBG(7, "delayed: conn->refcnt-1=%d conn->n_control=%d\n",
661 atomic_read(&cp->refcnt)-1,
662 atomic_read(&cp->n_control));
663
664 ip_vs_conn_put(cp);
665}
666
667
668void ip_vs_conn_expire_now(struct ip_vs_conn *cp)
669{
670 if (del_timer(&cp->timer))
671 mod_timer(&cp->timer, jiffies);
672}
673
674
675/*
676 * Create a new connection entry and hash it into the ip_vs_conn_tab
677 */
678struct ip_vs_conn *
679ip_vs_conn_new(int af, int proto, const union nf_inet_addr *caddr, __be16 cport,
680 const union nf_inet_addr *vaddr, __be16 vport,
681 const union nf_inet_addr *daddr, __be16 dport, unsigned flags,
682 struct ip_vs_dest *dest)
683{
684 struct ip_vs_conn *cp;
685 struct ip_vs_protocol *pp = ip_vs_proto_get(proto);
686
687 cp = kmem_cache_zalloc(ip_vs_conn_cachep, GFP_ATOMIC);
688 if (cp == NULL) {
689 IP_VS_ERR_RL("ip_vs_conn_new: no memory available.\n");
690 return NULL;
691 }
692
693 INIT_LIST_HEAD(&cp->c_list);
694 setup_timer(&cp->timer, ip_vs_conn_expire, (unsigned long)cp);
695 cp->af = af;
696 cp->protocol = proto;
697 ip_vs_addr_copy(af, &cp->caddr, caddr);
698 cp->cport = cport;
699 ip_vs_addr_copy(af, &cp->vaddr, vaddr);
700 cp->vport = vport;
701 ip_vs_addr_copy(af, &cp->daddr, daddr);
702 cp->dport = dport;
703 cp->flags = flags;
704 spin_lock_init(&cp->lock);
705
706 /*
707 * Set the entry is referenced by the current thread before hashing
708 * it in the table, so that other thread run ip_vs_random_dropentry
709 * but cannot drop this entry.
710 */
711 atomic_set(&cp->refcnt, 1);
712
713 atomic_set(&cp->n_control, 0);
714 atomic_set(&cp->in_pkts, 0);
715
716 atomic_inc(&ip_vs_conn_count);
717 if (flags & IP_VS_CONN_F_NO_CPORT)
718 atomic_inc(&ip_vs_conn_no_cport_cnt);
719
720 /* Bind the connection with a destination server */
721 ip_vs_bind_dest(cp, dest);
722
723 /* Set its state and timeout */
724 cp->state = 0;
725 cp->timeout = 3*HZ;
726
727 /* Bind its packet transmitter */
728#ifdef CONFIG_IP_VS_IPV6
729 if (af == AF_INET6)
730 ip_vs_bind_xmit_v6(cp);
731 else
732#endif
733 ip_vs_bind_xmit(cp);
734
735 if (unlikely(pp && atomic_read(&pp->appcnt)))
736 ip_vs_bind_app(cp, pp);
737
738 /* Hash it in the ip_vs_conn_tab finally */
739 ip_vs_conn_hash(cp);
740
741 return cp;
742}
743
744
745/*
746 * /proc/net/ip_vs_conn entries
747 */
748#ifdef CONFIG_PROC_FS
749
750static void *ip_vs_conn_array(struct seq_file *seq, loff_t pos)
751{
752 int idx;
753 struct ip_vs_conn *cp;
754
755 for(idx = 0; idx < IP_VS_CONN_TAB_SIZE; idx++) {
756 ct_read_lock_bh(idx);
757 list_for_each_entry(cp, &ip_vs_conn_tab[idx], c_list) {
758 if (pos-- == 0) {
759 seq->private = &ip_vs_conn_tab[idx];
760 return cp;
761 }
762 }
763 ct_read_unlock_bh(idx);
764 }
765
766 return NULL;
767}
768
769static void *ip_vs_conn_seq_start(struct seq_file *seq, loff_t *pos)
770{
771 seq->private = NULL;
772 return *pos ? ip_vs_conn_array(seq, *pos - 1) :SEQ_START_TOKEN;
773}
774
775static void *ip_vs_conn_seq_next(struct seq_file *seq, void *v, loff_t *pos)
776{
777 struct ip_vs_conn *cp = v;
778 struct list_head *e, *l = seq->private;
779 int idx;
780
781 ++*pos;
782 if (v == SEQ_START_TOKEN)
783 return ip_vs_conn_array(seq, 0);
784
785 /* more on same hash chain? */
786 if ((e = cp->c_list.next) != l)
787 return list_entry(e, struct ip_vs_conn, c_list);
788
789 idx = l - ip_vs_conn_tab;
790 ct_read_unlock_bh(idx);
791
792 while (++idx < IP_VS_CONN_TAB_SIZE) {
793 ct_read_lock_bh(idx);
794 list_for_each_entry(cp, &ip_vs_conn_tab[idx], c_list) {
795 seq->private = &ip_vs_conn_tab[idx];
796 return cp;
797 }
798 ct_read_unlock_bh(idx);
799 }
800 seq->private = NULL;
801 return NULL;
802}
803
804static void ip_vs_conn_seq_stop(struct seq_file *seq, void *v)
805{
806 struct list_head *l = seq->private;
807
808 if (l)
809 ct_read_unlock_bh(l - ip_vs_conn_tab);
810}
811
812static int ip_vs_conn_seq_show(struct seq_file *seq, void *v)
813{
814
815 if (v == SEQ_START_TOKEN)
816 seq_puts(seq,
817 "Pro FromIP FPrt ToIP TPrt DestIP DPrt State Expires\n");
818 else {
819 const struct ip_vs_conn *cp = v;
820
821#ifdef CONFIG_IP_VS_IPV6
822 if (cp->af == AF_INET6)
823 seq_printf(seq,
824 "%-3s " NIP6_FMT " %04X " NIP6_FMT
825 " %04X " NIP6_FMT " %04X %-11s %7lu\n",
826 ip_vs_proto_name(cp->protocol),
827 NIP6(cp->caddr.in6), ntohs(cp->cport),
828 NIP6(cp->vaddr.in6), ntohs(cp->vport),
829 NIP6(cp->daddr.in6), ntohs(cp->dport),
830 ip_vs_state_name(cp->protocol, cp->state),
831 (cp->timer.expires-jiffies)/HZ);
832 else
833#endif
834 seq_printf(seq,
835 "%-3s %08X %04X %08X %04X"
836 " %08X %04X %-11s %7lu\n",
837 ip_vs_proto_name(cp->protocol),
838 ntohl(cp->caddr.ip), ntohs(cp->cport),
839 ntohl(cp->vaddr.ip), ntohs(cp->vport),
840 ntohl(cp->daddr.ip), ntohs(cp->dport),
841 ip_vs_state_name(cp->protocol, cp->state),
842 (cp->timer.expires-jiffies)/HZ);
843 }
844 return 0;
845}
846
847static const struct seq_operations ip_vs_conn_seq_ops = {
848 .start = ip_vs_conn_seq_start,
849 .next = ip_vs_conn_seq_next,
850 .stop = ip_vs_conn_seq_stop,
851 .show = ip_vs_conn_seq_show,
852};
853
854static int ip_vs_conn_open(struct inode *inode, struct file *file)
855{
856 return seq_open(file, &ip_vs_conn_seq_ops);
857}
858
859static const struct file_operations ip_vs_conn_fops = {
860 .owner = THIS_MODULE,
861 .open = ip_vs_conn_open,
862 .read = seq_read,
863 .llseek = seq_lseek,
864 .release = seq_release,
865};
866
867static const char *ip_vs_origin_name(unsigned flags)
868{
869 if (flags & IP_VS_CONN_F_SYNC)
870 return "SYNC";
871 else
872 return "LOCAL";
873}
874
875static int ip_vs_conn_sync_seq_show(struct seq_file *seq, void *v)
876{
877
878 if (v == SEQ_START_TOKEN)
879 seq_puts(seq,
880 "Pro FromIP FPrt ToIP TPrt DestIP DPrt State Origin Expires\n");
881 else {
882 const struct ip_vs_conn *cp = v;
883
884#ifdef CONFIG_IP_VS_IPV6
885 if (cp->af == AF_INET6)
886 seq_printf(seq,
887 "%-3s " NIP6_FMT " %04X " NIP6_FMT
888 " %04X " NIP6_FMT " %04X %-11s %-6s %7lu\n",
889 ip_vs_proto_name(cp->protocol),
890 NIP6(cp->caddr.in6), ntohs(cp->cport),
891 NIP6(cp->vaddr.in6), ntohs(cp->vport),
892 NIP6(cp->daddr.in6), ntohs(cp->dport),
893 ip_vs_state_name(cp->protocol, cp->state),
894 ip_vs_origin_name(cp->flags),
895 (cp->timer.expires-jiffies)/HZ);
896 else
897#endif
898 seq_printf(seq,
899 "%-3s %08X %04X %08X %04X "
900 "%08X %04X %-11s %-6s %7lu\n",
901 ip_vs_proto_name(cp->protocol),
902 ntohl(cp->caddr.ip), ntohs(cp->cport),
903 ntohl(cp->vaddr.ip), ntohs(cp->vport),
904 ntohl(cp->daddr.ip), ntohs(cp->dport),
905 ip_vs_state_name(cp->protocol, cp->state),
906 ip_vs_origin_name(cp->flags),
907 (cp->timer.expires-jiffies)/HZ);
908 }
909 return 0;
910}
911
912static const struct seq_operations ip_vs_conn_sync_seq_ops = {
913 .start = ip_vs_conn_seq_start,
914 .next = ip_vs_conn_seq_next,
915 .stop = ip_vs_conn_seq_stop,
916 .show = ip_vs_conn_sync_seq_show,
917};
918
919static int ip_vs_conn_sync_open(struct inode *inode, struct file *file)
920{
921 return seq_open(file, &ip_vs_conn_sync_seq_ops);
922}
923
924static const struct file_operations ip_vs_conn_sync_fops = {
925 .owner = THIS_MODULE,
926 .open = ip_vs_conn_sync_open,
927 .read = seq_read,
928 .llseek = seq_lseek,
929 .release = seq_release,
930};
931
932#endif
933
934
935/*
936 * Randomly drop connection entries before running out of memory
937 */
938static inline int todrop_entry(struct ip_vs_conn *cp)
939{
940 /*
941 * The drop rate array needs tuning for real environments.
942 * Called from timer bh only => no locking
943 */
944 static const char todrop_rate[9] = {0, 1, 2, 3, 4, 5, 6, 7, 8};
945 static char todrop_counter[9] = {0};
946 int i;
947
948 /* if the conn entry hasn't lasted for 60 seconds, don't drop it.
949 This will leave enough time for normal connection to get
950 through. */
951 if (time_before(cp->timeout + jiffies, cp->timer.expires + 60*HZ))
952 return 0;
953
954 /* Don't drop the entry if its number of incoming packets is not
955 located in [0, 8] */
956 i = atomic_read(&cp->in_pkts);
957 if (i > 8 || i < 0) return 0;
958
959 if (!todrop_rate[i]) return 0;
960 if (--todrop_counter[i] > 0) return 0;
961
962 todrop_counter[i] = todrop_rate[i];
963 return 1;
964}
965
966/* Called from keventd and must protect itself from softirqs */
967void ip_vs_random_dropentry(void)
968{
969 int idx;
970 struct ip_vs_conn *cp;
971
972 /*
973 * Randomly scan 1/32 of the whole table every second
974 */
975 for (idx = 0; idx < (IP_VS_CONN_TAB_SIZE>>5); idx++) {
976 unsigned hash = net_random() & IP_VS_CONN_TAB_MASK;
977
978 /*
979 * Lock is actually needed in this loop.
980 */
981 ct_write_lock_bh(hash);
982
983 list_for_each_entry(cp, &ip_vs_conn_tab[hash], c_list) {
984 if (cp->flags & IP_VS_CONN_F_TEMPLATE)
985 /* connection template */
986 continue;
987
988 if (cp->protocol == IPPROTO_TCP) {
989 switch(cp->state) {
990 case IP_VS_TCP_S_SYN_RECV:
991 case IP_VS_TCP_S_SYNACK:
992 break;
993
994 case IP_VS_TCP_S_ESTABLISHED:
995 if (todrop_entry(cp))
996 break;
997 continue;
998
999 default:
1000 continue;
1001 }
1002 } else {
1003 if (!todrop_entry(cp))
1004 continue;
1005 }
1006
1007 IP_VS_DBG(4, "del connection\n");
1008 ip_vs_conn_expire_now(cp);
1009 if (cp->control) {
1010 IP_VS_DBG(4, "del conn template\n");
1011 ip_vs_conn_expire_now(cp->control);
1012 }
1013 }
1014 ct_write_unlock_bh(hash);
1015 }
1016}
1017
1018
1019/*
1020 * Flush all the connection entries in the ip_vs_conn_tab
1021 */
1022static void ip_vs_conn_flush(void)
1023{
1024 int idx;
1025 struct ip_vs_conn *cp;
1026
1027 flush_again:
1028 for (idx=0; idx<IP_VS_CONN_TAB_SIZE; idx++) {
1029 /*
1030 * Lock is actually needed in this loop.
1031 */
1032 ct_write_lock_bh(idx);
1033
1034 list_for_each_entry(cp, &ip_vs_conn_tab[idx], c_list) {
1035
1036 IP_VS_DBG(4, "del connection\n");
1037 ip_vs_conn_expire_now(cp);
1038 if (cp->control) {
1039 IP_VS_DBG(4, "del conn template\n");
1040 ip_vs_conn_expire_now(cp->control);
1041 }
1042 }
1043 ct_write_unlock_bh(idx);
1044 }
1045
1046 /* the counter may be not NULL, because maybe some conn entries
1047 are run by slow timer handler or unhashed but still referred */
1048 if (atomic_read(&ip_vs_conn_count) != 0) {
1049 schedule();
1050 goto flush_again;
1051 }
1052}
1053
1054
1055int __init ip_vs_conn_init(void)
1056{
1057 int idx;
1058
1059 /*
1060 * Allocate the connection hash table and initialize its list heads
1061 */
1062 ip_vs_conn_tab = vmalloc(IP_VS_CONN_TAB_SIZE*sizeof(struct list_head));
1063 if (!ip_vs_conn_tab)
1064 return -ENOMEM;
1065
1066 /* Allocate ip_vs_conn slab cache */
1067 ip_vs_conn_cachep = kmem_cache_create("ip_vs_conn",
1068 sizeof(struct ip_vs_conn), 0,
1069 SLAB_HWCACHE_ALIGN, NULL);
1070 if (!ip_vs_conn_cachep) {
1071 vfree(ip_vs_conn_tab);
1072 return -ENOMEM;
1073 }
1074
1075 IP_VS_INFO("Connection hash table configured "
1076 "(size=%d, memory=%ldKbytes)\n",
1077 IP_VS_CONN_TAB_SIZE,
1078 (long)(IP_VS_CONN_TAB_SIZE*sizeof(struct list_head))/1024);
1079 IP_VS_DBG(0, "Each connection entry needs %Zd bytes at least\n",
1080 sizeof(struct ip_vs_conn));
1081
1082 for (idx = 0; idx < IP_VS_CONN_TAB_SIZE; idx++) {
1083 INIT_LIST_HEAD(&ip_vs_conn_tab[idx]);
1084 }
1085
1086 for (idx = 0; idx < CT_LOCKARRAY_SIZE; idx++) {
1087 rwlock_init(&__ip_vs_conntbl_lock_array[idx].l);
1088 }
1089
1090 proc_net_fops_create(&init_net, "ip_vs_conn", 0, &ip_vs_conn_fops);
1091 proc_net_fops_create(&init_net, "ip_vs_conn_sync", 0, &ip_vs_conn_sync_fops);
1092
1093 /* calculate the random value for connection hash */
1094 get_random_bytes(&ip_vs_conn_rnd, sizeof(ip_vs_conn_rnd));
1095
1096 return 0;
1097}
1098
1099
1100void ip_vs_conn_cleanup(void)
1101{
1102 /* flush all the connection entries first */
1103 ip_vs_conn_flush();
1104
1105 /* Release the empty cache */
1106 kmem_cache_destroy(ip_vs_conn_cachep);
1107 proc_net_remove(&init_net, "ip_vs_conn");
1108 proc_net_remove(&init_net, "ip_vs_conn_sync");
1109 vfree(ip_vs_conn_tab);
1110}
generated by cgit v1.2.2 (git 2.25.0) at 2025-01-11 18:37:41 -0500