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Committer: Michael Beasley <mike@snafu.setup>
[mikesnafu-overlay.git] / net / ipv4 / ipvs / ip_vs_ctl.c
blob94c5767c8e0192545c75e071893bae08af0fe4c9
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 * Version: $Id: ip_vs_ctl.c,v 1.36 2003/06/08 09:31:19 wensong Exp $
9 *
10 * Authors: Wensong Zhang <wensong@linuxvirtualserver.org>
11 * Peter Kese <peter.kese@ijs.si>
12 * Julian Anastasov <ja@ssi.bg>
13 *
14 * This program is free software; you can redistribute it and/or
15 * modify it under the terms of the GNU General Public License
16 * as published by the Free Software Foundation; either version
17 * 2 of the License, or (at your option) any later version.
18 *
19 * Changes:
20 *
21 */
22
23 #include <linux/module.h>
24 #include <linux/init.h>
25 #include <linux/types.h>
26 #include <linux/capability.h>
27 #include <linux/fs.h>
28 #include <linux/sysctl.h>
29 #include <linux/proc_fs.h>
30 #include <linux/workqueue.h>
31 #include <linux/swap.h>
32 #include <linux/seq_file.h>
33
34 #include <linux/netfilter.h>
35 #include <linux/netfilter_ipv4.h>
36 #include <linux/mutex.h>
37
38 #include <net/net_namespace.h>
39 #include <net/ip.h>
40 #include <net/route.h>
41 #include <net/sock.h>
42
43 #include <asm/uaccess.h>
44
45 #include <net/ip_vs.h>
46
47 /* semaphore for IPVS sockopts. And, [gs]etsockopt may sleep. */
48 static DEFINE_MUTEX(__ip_vs_mutex);
49
50 /* lock for service table */
51 static DEFINE_RWLOCK(__ip_vs_svc_lock);
52
53 /* lock for table with the real services */
54 static DEFINE_RWLOCK(__ip_vs_rs_lock);
55
56 /* lock for state and timeout tables */
57 static DEFINE_RWLOCK(__ip_vs_securetcp_lock);
58
59 /* lock for drop entry handling */
60 static DEFINE_SPINLOCK(__ip_vs_dropentry_lock);
61
62 /* lock for drop packet handling */
63 static DEFINE_SPINLOCK(__ip_vs_droppacket_lock);
64
65 /* 1/rate drop and drop-entry variables */
66 int ip_vs_drop_rate = 0;
67 int ip_vs_drop_counter = 0;
68 static atomic_t ip_vs_dropentry = ATOMIC_INIT(0);
69
70 /* number of virtual services */
71 static int ip_vs_num_services = 0;
72
73 /* sysctl variables */
74 static int sysctl_ip_vs_drop_entry = 0;
75 static int sysctl_ip_vs_drop_packet = 0;
76 static int sysctl_ip_vs_secure_tcp = 0;
77 static int sysctl_ip_vs_amemthresh = 1024;
78 static int sysctl_ip_vs_am_droprate = 10;
79 int sysctl_ip_vs_cache_bypass = 0;
80 int sysctl_ip_vs_expire_nodest_conn = 0;
81 int sysctl_ip_vs_expire_quiescent_template = 0;
82 int sysctl_ip_vs_sync_threshold[2] = { 3, 50 };
83 int sysctl_ip_vs_nat_icmp_send = 0;
84
85
86 #ifdef CONFIG_IP_VS_DEBUG
87 static int sysctl_ip_vs_debug_level = 0;
88
89 int ip_vs_get_debug_level(void)
90 {
91 return sysctl_ip_vs_debug_level;
92 }
93 #endif
94
95 /*
96 * update_defense_level is called from keventd and from sysctl,
97 * so it needs to protect itself from softirqs
98 */
99 static void update_defense_level(void)
100 {
101 struct sysinfo i;
102 static int old_secure_tcp = 0;
103 int availmem;
104 int nomem;
105 int to_change = -1;
106
107 /* we only count free and buffered memory (in pages) */
108 si_meminfo(&i);
109 availmem = i.freeram + i.bufferram;
110 /* however in linux 2.5 the i.bufferram is total page cache size,
111 we need adjust it */
112 /* si_swapinfo(&i); */
113 /* availmem = availmem - (i.totalswap - i.freeswap); */
114
115 nomem = (availmem < sysctl_ip_vs_amemthresh);
116
117 local_bh_disable();
118
119 /* drop_entry */
120 spin_lock(&__ip_vs_dropentry_lock);
121 switch (sysctl_ip_vs_drop_entry) {
122 case 0:
123 atomic_set(&ip_vs_dropentry, 0);
124 break;
125 case 1:
126 if (nomem) {
127 atomic_set(&ip_vs_dropentry, 1);
128 sysctl_ip_vs_drop_entry = 2;
129 } else {
130 atomic_set(&ip_vs_dropentry, 0);
131 }
132 break;
133 case 2:
134 if (nomem) {
135 atomic_set(&ip_vs_dropentry, 1);
136 } else {
137 atomic_set(&ip_vs_dropentry, 0);
138 sysctl_ip_vs_drop_entry = 1;
139 };
140 break;
141 case 3:
142 atomic_set(&ip_vs_dropentry, 1);
143 break;
144 }
145 spin_unlock(&__ip_vs_dropentry_lock);
146
147 /* drop_packet */
148 spin_lock(&__ip_vs_droppacket_lock);
149 switch (sysctl_ip_vs_drop_packet) {
150 case 0:
151 ip_vs_drop_rate = 0;
152 break;
153 case 1:
154 if (nomem) {
155 ip_vs_drop_rate = ip_vs_drop_counter
156 = sysctl_ip_vs_amemthresh /
157 (sysctl_ip_vs_amemthresh-availmem);
158 sysctl_ip_vs_drop_packet = 2;
159 } else {
160 ip_vs_drop_rate = 0;
161 }
162 break;
163 case 2:
164 if (nomem) {
165 ip_vs_drop_rate = ip_vs_drop_counter
166 = sysctl_ip_vs_amemthresh /
167 (sysctl_ip_vs_amemthresh-availmem);
168 } else {
169 ip_vs_drop_rate = 0;
170 sysctl_ip_vs_drop_packet = 1;
171 }
172 break;
173 case 3:
174 ip_vs_drop_rate = sysctl_ip_vs_am_droprate;
175 break;
176 }
177 spin_unlock(&__ip_vs_droppacket_lock);
178
179 /* secure_tcp */
180 write_lock(&__ip_vs_securetcp_lock);
181 switch (sysctl_ip_vs_secure_tcp) {
182 case 0:
183 if (old_secure_tcp >= 2)
184 to_change = 0;
185 break;
186 case 1:
187 if (nomem) {
188 if (old_secure_tcp < 2)
189 to_change = 1;
190 sysctl_ip_vs_secure_tcp = 2;
191 } else {
192 if (old_secure_tcp >= 2)
193 to_change = 0;
194 }
195 break;
196 case 2:
197 if (nomem) {
198 if (old_secure_tcp < 2)
199 to_change = 1;
200 } else {
201 if (old_secure_tcp >= 2)
202 to_change = 0;
203 sysctl_ip_vs_secure_tcp = 1;
204 }
205 break;
206 case 3:
207 if (old_secure_tcp < 2)
208 to_change = 1;
209 break;
210 }
211 old_secure_tcp = sysctl_ip_vs_secure_tcp;
212 if (to_change >= 0)
213 ip_vs_protocol_timeout_change(sysctl_ip_vs_secure_tcp>1);
214 write_unlock(&__ip_vs_securetcp_lock);
215
216 local_bh_enable();
217 }
218
219
220 /*
221 * Timer for checking the defense
222 */
223 #define DEFENSE_TIMER_PERIOD 1*HZ
224 static void defense_work_handler(struct work_struct *work);
225 static DECLARE_DELAYED_WORK(defense_work, defense_work_handler);
226
227 static void defense_work_handler(struct work_struct *work)
228 {
229 update_defense_level();
230 if (atomic_read(&ip_vs_dropentry))
231 ip_vs_random_dropentry();
232
233 schedule_delayed_work(&defense_work, DEFENSE_TIMER_PERIOD);
234 }
235
236 int
237 ip_vs_use_count_inc(void)
238 {
239 return try_module_get(THIS_MODULE);
240 }
241
242 void
243 ip_vs_use_count_dec(void)
244 {
245 module_put(THIS_MODULE);
246 }
247
248
249 /*
250 * Hash table: for virtual service lookups
251 */
252 #define IP_VS_SVC_TAB_BITS 8
253 #define IP_VS_SVC_TAB_SIZE (1 << IP_VS_SVC_TAB_BITS)
254 #define IP_VS_SVC_TAB_MASK (IP_VS_SVC_TAB_SIZE - 1)
255
256 /* the service table hashed by <protocol, addr, port> */
257 static struct list_head ip_vs_svc_table[IP_VS_SVC_TAB_SIZE];
258 /* the service table hashed by fwmark */
259 static struct list_head ip_vs_svc_fwm_table[IP_VS_SVC_TAB_SIZE];
260
261 /*
262 * Hash table: for real service lookups
263 */
264 #define IP_VS_RTAB_BITS 4
265 #define IP_VS_RTAB_SIZE (1 << IP_VS_RTAB_BITS)
266 #define IP_VS_RTAB_MASK (IP_VS_RTAB_SIZE - 1)
267
268 static struct list_head ip_vs_rtable[IP_VS_RTAB_SIZE];
269
270 /*
271 * Trash for destinations
272 */
273 static LIST_HEAD(ip_vs_dest_trash);
274
275 /*
276 * FTP & NULL virtual service counters
277 */
278 static atomic_t ip_vs_ftpsvc_counter = ATOMIC_INIT(0);
279 static atomic_t ip_vs_nullsvc_counter = ATOMIC_INIT(0);
280
281
282 /*
283 * Returns hash value for virtual service
284 */
285 static __inline__ unsigned
286 ip_vs_svc_hashkey(unsigned proto, __be32 addr, __be16 port)
287 {
288 register unsigned porth = ntohs(port);
289
290 return (proto^ntohl(addr)^(porth>>IP_VS_SVC_TAB_BITS)^porth)
291 & IP_VS_SVC_TAB_MASK;
292 }
293
294 /*
295 * Returns hash value of fwmark for virtual service lookup
296 */
297 static __inline__ unsigned ip_vs_svc_fwm_hashkey(__u32 fwmark)
298 {
299 return fwmark & IP_VS_SVC_TAB_MASK;
300 }
301
302 /*
303 * Hashes a service in the ip_vs_svc_table by <proto,addr,port>
304 * or in the ip_vs_svc_fwm_table by fwmark.
305 * Should be called with locked tables.
306 */
307 static int ip_vs_svc_hash(struct ip_vs_service *svc)
308 {
309 unsigned hash;
310
311 if (svc->flags & IP_VS_SVC_F_HASHED) {
312 IP_VS_ERR("ip_vs_svc_hash(): request for already hashed, "
313 "called from %p\n", __builtin_return_address(0));
314 return 0;
315 }
316
317 if (svc->fwmark == 0) {
318 /*
319 * Hash it by <protocol,addr,port> in ip_vs_svc_table
320 */
321 hash = ip_vs_svc_hashkey(svc->protocol, svc->addr, svc->port);
322 list_add(&svc->s_list, &ip_vs_svc_table[hash]);
323 } else {
324 /*
325 * Hash it by fwmark in ip_vs_svc_fwm_table
326 */
327 hash = ip_vs_svc_fwm_hashkey(svc->fwmark);
328 list_add(&svc->f_list, &ip_vs_svc_fwm_table[hash]);
329 }
330
331 svc->flags |= IP_VS_SVC_F_HASHED;
332 /* increase its refcnt because it is referenced by the svc table */
333 atomic_inc(&svc->refcnt);
334 return 1;
335 }
336
337
338 /*
339 * Unhashes a service from ip_vs_svc_table/ip_vs_svc_fwm_table.
340 * Should be called with locked tables.
341 */
342 static int ip_vs_svc_unhash(struct ip_vs_service *svc)
343 {
344 if (!(svc->flags & IP_VS_SVC_F_HASHED)) {
345 IP_VS_ERR("ip_vs_svc_unhash(): request for unhash flagged, "
346 "called from %p\n", __builtin_return_address(0));
347 return 0;
348 }
349
350 if (svc->fwmark == 0) {
351 /* Remove it from the ip_vs_svc_table table */
352 list_del(&svc->s_list);
353 } else {
354 /* Remove it from the ip_vs_svc_fwm_table table */
355 list_del(&svc->f_list);
356 }
357
358 svc->flags &= ~IP_VS_SVC_F_HASHED;
359 atomic_dec(&svc->refcnt);
360 return 1;
361 }
362
363
364 /*
365 * Get service by {proto,addr,port} in the service table.
366 */
367 static __inline__ struct ip_vs_service *
368 __ip_vs_service_get(__u16 protocol, __be32 vaddr, __be16 vport)
369 {
370 unsigned hash;
371 struct ip_vs_service *svc;
372
373 /* Check for "full" addressed entries */
374 hash = ip_vs_svc_hashkey(protocol, vaddr, vport);
375
376 list_for_each_entry(svc, &ip_vs_svc_table[hash], s_list){
377 if ((svc->addr == vaddr)
378 && (svc->port == vport)
379 && (svc->protocol == protocol)) {
380 /* HIT */
381 atomic_inc(&svc->usecnt);
382 return svc;
383 }
384 }
385
386 return NULL;
387 }
388
389
390 /*
391 * Get service by {fwmark} in the service table.
392 */
393 static __inline__ struct ip_vs_service *__ip_vs_svc_fwm_get(__u32 fwmark)
394 {
395 unsigned hash;
396 struct ip_vs_service *svc;
397
398 /* Check for fwmark addressed entries */
399 hash = ip_vs_svc_fwm_hashkey(fwmark);
400
401 list_for_each_entry(svc, &ip_vs_svc_fwm_table[hash], f_list) {
402 if (svc->fwmark == fwmark) {
403 /* HIT */
404 atomic_inc(&svc->usecnt);
405 return svc;
406 }
407 }
408
409 return NULL;
410 }
411
412 struct ip_vs_service *
413 ip_vs_service_get(__u32 fwmark, __u16 protocol, __be32 vaddr, __be16 vport)
414 {
415 struct ip_vs_service *svc;
416
417 read_lock(&__ip_vs_svc_lock);
418
419 /*
420 * Check the table hashed by fwmark first
421 */
422 if (fwmark && (svc = __ip_vs_svc_fwm_get(fwmark)))
423 goto out;
424
425 /*
426 * Check the table hashed by <protocol,addr,port>
427 * for "full" addressed entries
428 */
429 svc = __ip_vs_service_get(protocol, vaddr, vport);
430
431 if (svc == NULL
432 && protocol == IPPROTO_TCP
433 && atomic_read(&ip_vs_ftpsvc_counter)
434 && (vport == FTPDATA || ntohs(vport) >= PROT_SOCK)) {
435 /*
436 * Check if ftp service entry exists, the packet
437 * might belong to FTP data connections.
438 */
439 svc = __ip_vs_service_get(protocol, vaddr, FTPPORT);
440 }
441
442 if (svc == NULL
443 && atomic_read(&ip_vs_nullsvc_counter)) {
444 /*
445 * Check if the catch-all port (port zero) exists
446 */
447 svc = __ip_vs_service_get(protocol, vaddr, 0);
448 }
449
450 out:
451 read_unlock(&__ip_vs_svc_lock);
452
453 IP_VS_DBG(9, "lookup service: fwm %u %s %u.%u.%u.%u:%u %s\n",
454 fwmark, ip_vs_proto_name(protocol),
455 NIPQUAD(vaddr), ntohs(vport),
456 svc?"hit":"not hit");
457
458 return svc;
459 }
460
461
462 static inline void
463 __ip_vs_bind_svc(struct ip_vs_dest *dest, struct ip_vs_service *svc)
464 {
465 atomic_inc(&svc->refcnt);
466 dest->svc = svc;
467 }
468
469 static inline void
470 __ip_vs_unbind_svc(struct ip_vs_dest *dest)
471 {
472 struct ip_vs_service *svc = dest->svc;
473
474 dest->svc = NULL;
475 if (atomic_dec_and_test(&svc->refcnt))
476 kfree(svc);
477 }
478
479
480 /*
481 * Returns hash value for real service
482 */
483 static __inline__ unsigned ip_vs_rs_hashkey(__be32 addr, __be16 port)
484 {
485 register unsigned porth = ntohs(port);
486
487 return (ntohl(addr)^(porth>>IP_VS_RTAB_BITS)^porth)
488 & IP_VS_RTAB_MASK;
489 }
490
491 /*
492 * Hashes ip_vs_dest in ip_vs_rtable by <proto,addr,port>.
493 * should be called with locked tables.
494 */
495 static int ip_vs_rs_hash(struct ip_vs_dest *dest)
496 {
497 unsigned hash;
498
499 if (!list_empty(&dest->d_list)) {
500 return 0;
501 }
502
503 /*
504 * Hash by proto,addr,port,
505 * which are the parameters of the real service.
506 */
507 hash = ip_vs_rs_hashkey(dest->addr, dest->port);
508 list_add(&dest->d_list, &ip_vs_rtable[hash]);
509
510 return 1;
511 }
512
513 /*
514 * UNhashes ip_vs_dest from ip_vs_rtable.
515 * should be called with locked tables.
516 */
517 static int ip_vs_rs_unhash(struct ip_vs_dest *dest)
518 {
519 /*
520 * Remove it from the ip_vs_rtable table.
521 */
522 if (!list_empty(&dest->d_list)) {
523 list_del(&dest->d_list);
524 INIT_LIST_HEAD(&dest->d_list);
525 }
526
527 return 1;
528 }
529
530 /*
531 * Lookup real service by <proto,addr,port> in the real service table.
532 */
533 struct ip_vs_dest *
534 ip_vs_lookup_real_service(__u16 protocol, __be32 daddr, __be16 dport)
535 {
536 unsigned hash;
537 struct ip_vs_dest *dest;
538
539 /*
540 * Check for "full" addressed entries
541 * Return the first found entry
542 */
543 hash = ip_vs_rs_hashkey(daddr, dport);
544
545 read_lock(&__ip_vs_rs_lock);
546 list_for_each_entry(dest, &ip_vs_rtable[hash], d_list) {
547 if ((dest->addr == daddr)
548 && (dest->port == dport)
549 && ((dest->protocol == protocol) ||
550 dest->vfwmark)) {
551 /* HIT */
552 read_unlock(&__ip_vs_rs_lock);
553 return dest;
554 }
555 }
556 read_unlock(&__ip_vs_rs_lock);
557
558 return NULL;
559 }
560
561 /*
562 * Lookup destination by {addr,port} in the given service
563 */
564 static struct ip_vs_dest *
565 ip_vs_lookup_dest(struct ip_vs_service *svc, __be32 daddr, __be16 dport)
566 {
567 struct ip_vs_dest *dest;
568
569 /*
570 * Find the destination for the given service
571 */
572 list_for_each_entry(dest, &svc->destinations, n_list) {
573 if ((dest->addr == daddr) && (dest->port == dport)) {
574 /* HIT */
575 return dest;
576 }
577 }
578
579 return NULL;
580 }
581
582 /*
583 * Find destination by {daddr,dport,vaddr,protocol}
584 * Cretaed to be used in ip_vs_process_message() in
585 * the backup synchronization daemon. It finds the
586 * destination to be bound to the received connection
587 * on the backup.
588 *
589 * ip_vs_lookup_real_service() looked promissing, but
590 * seems not working as expected.
591 */
592 struct ip_vs_dest *ip_vs_find_dest(__be32 daddr, __be16 dport,
593 __be32 vaddr, __be16 vport, __u16 protocol)
594 {
595 struct ip_vs_dest *dest;
596 struct ip_vs_service *svc;
597
598 svc = ip_vs_service_get(0, protocol, vaddr, vport);
599 if (!svc)
600 return NULL;
601 dest = ip_vs_lookup_dest(svc, daddr, dport);
602 if (dest)
603 atomic_inc(&dest->refcnt);
604 ip_vs_service_put(svc);
605 return dest;
606 }
607
608 /*
609 * Lookup dest by {svc,addr,port} in the destination trash.
610 * The destination trash is used to hold the destinations that are removed
611 * from the service table but are still referenced by some conn entries.
612 * The reason to add the destination trash is when the dest is temporary
613 * down (either by administrator or by monitor program), the dest can be
614 * picked back from the trash, the remaining connections to the dest can
615 * continue, and the counting information of the dest is also useful for
616 * scheduling.
617 */
618 static struct ip_vs_dest *
619 ip_vs_trash_get_dest(struct ip_vs_service *svc, __be32 daddr, __be16 dport)
620 {
621 struct ip_vs_dest *dest, *nxt;
622
623 /*
624 * Find the destination in trash
625 */
626 list_for_each_entry_safe(dest, nxt, &ip_vs_dest_trash, n_list) {
627 IP_VS_DBG(3, "Destination %u/%u.%u.%u.%u:%u still in trash, "
628 "dest->refcnt=%d\n",
629 dest->vfwmark,
630 NIPQUAD(dest->addr), ntohs(dest->port),
631 atomic_read(&dest->refcnt));
632 if (dest->addr == daddr &&
633 dest->port == dport &&
634 dest->vfwmark == svc->fwmark &&
635 dest->protocol == svc->protocol &&
636 (svc->fwmark ||
637 (dest->vaddr == svc->addr &&
638 dest->vport == svc->port))) {
639 /* HIT */
640 return dest;
641 }
642
643 /*
644 * Try to purge the destination from trash if not referenced
645 */
646 if (atomic_read(&dest->refcnt) == 1) {
647 IP_VS_DBG(3, "Removing destination %u/%u.%u.%u.%u:%u "
648 "from trash\n",
649 dest->vfwmark,
650 NIPQUAD(dest->addr), ntohs(dest->port));
651 list_del(&dest->n_list);
652 ip_vs_dst_reset(dest);
653 __ip_vs_unbind_svc(dest);
654 kfree(dest);
655 }
656 }
657
658 return NULL;
659 }
660
661
662 /*
663 * Clean up all the destinations in the trash
664 * Called by the ip_vs_control_cleanup()
665 *
666 * When the ip_vs_control_clearup is activated by ipvs module exit,
667 * the service tables must have been flushed and all the connections
668 * are expired, and the refcnt of each destination in the trash must
669 * be 1, so we simply release them here.
670 */
671 static void ip_vs_trash_cleanup(void)
672 {
673 struct ip_vs_dest *dest, *nxt;
674
675 list_for_each_entry_safe(dest, nxt, &ip_vs_dest_trash, n_list) {
676 list_del(&dest->n_list);
677 ip_vs_dst_reset(dest);
678 __ip_vs_unbind_svc(dest);
679 kfree(dest);
680 }
681 }
682
683
684 static void
685 ip_vs_zero_stats(struct ip_vs_stats *stats)
686 {
687 spin_lock_bh(&stats->lock);
688 memset(stats, 0, (char *)&stats->lock - (char *)stats);
689 spin_unlock_bh(&stats->lock);
690 ip_vs_zero_estimator(stats);
691 }
692
693 /*
694 * Update a destination in the given service
695 */
696 static void
697 __ip_vs_update_dest(struct ip_vs_service *svc,
698 struct ip_vs_dest *dest, struct ip_vs_dest_user *udest)
699 {
700 int conn_flags;
701
702 /* set the weight and the flags */
703 atomic_set(&dest->weight, udest->weight);
704 conn_flags = udest->conn_flags | IP_VS_CONN_F_INACTIVE;
705
706 /* check if local node and update the flags */
707 if (inet_addr_type(&init_net, udest->addr) == RTN_LOCAL) {
708 conn_flags = (conn_flags & ~IP_VS_CONN_F_FWD_MASK)
709 | IP_VS_CONN_F_LOCALNODE;
710 }
711
712 /* set the IP_VS_CONN_F_NOOUTPUT flag if not masquerading/NAT */
713 if ((conn_flags & IP_VS_CONN_F_FWD_MASK) != 0) {
714 conn_flags |= IP_VS_CONN_F_NOOUTPUT;
715 } else {
716 /*
717 * Put the real service in ip_vs_rtable if not present.
718 * For now only for NAT!
719 */
720 write_lock_bh(&__ip_vs_rs_lock);
721 ip_vs_rs_hash(dest);
722 write_unlock_bh(&__ip_vs_rs_lock);
723 }
724 atomic_set(&dest->conn_flags, conn_flags);
725
726 /* bind the service */
727 if (!dest->svc) {
728 __ip_vs_bind_svc(dest, svc);
729 } else {
730 if (dest->svc != svc) {
731 __ip_vs_unbind_svc(dest);
732 ip_vs_zero_stats(&dest->stats);
733 __ip_vs_bind_svc(dest, svc);
734 }
735 }
736
737 /* set the dest status flags */
738 dest->flags |= IP_VS_DEST_F_AVAILABLE;
739
740 if (udest->u_threshold == 0 || udest->u_threshold > dest->u_threshold)
741 dest->flags &= ~IP_VS_DEST_F_OVERLOAD;
742 dest->u_threshold = udest->u_threshold;
743 dest->l_threshold = udest->l_threshold;
744 }
745
746
747 /*
748 * Create a destination for the given service
749 */
750 static int
751 ip_vs_new_dest(struct ip_vs_service *svc, struct ip_vs_dest_user *udest,
752 struct ip_vs_dest **dest_p)
753 {
754 struct ip_vs_dest *dest;
755 unsigned atype;
756
757 EnterFunction(2);
758
759 atype = inet_addr_type(&init_net, udest->addr);
760 if (atype != RTN_LOCAL && atype != RTN_UNICAST)
761 return -EINVAL;
762
763 dest = kzalloc(sizeof(struct ip_vs_dest), GFP_ATOMIC);
764 if (dest == NULL) {
765 IP_VS_ERR("ip_vs_new_dest: kmalloc failed.\n");
766 return -ENOMEM;
767 }
768
769 dest->protocol = svc->protocol;
770 dest->vaddr = svc->addr;
771 dest->vport = svc->port;
772 dest->vfwmark = svc->fwmark;
773 dest->addr = udest->addr;
774 dest->port = udest->port;
775
776 atomic_set(&dest->activeconns, 0);
777 atomic_set(&dest->inactconns, 0);
778 atomic_set(&dest->persistconns, 0);
779 atomic_set(&dest->refcnt, 0);
780
781 INIT_LIST_HEAD(&dest->d_list);
782 spin_lock_init(&dest->dst_lock);
783 spin_lock_init(&dest->stats.lock);
784 __ip_vs_update_dest(svc, dest, udest);
785 ip_vs_new_estimator(&dest->stats);
786
787 *dest_p = dest;
788
789 LeaveFunction(2);
790 return 0;
791 }
792
793
794 /*
795 * Add a destination into an existing service
796 */
797 static int
798 ip_vs_add_dest(struct ip_vs_service *svc, struct ip_vs_dest_user *udest)
799 {
800 struct ip_vs_dest *dest;
801 __be32 daddr = udest->addr;
802 __be16 dport = udest->port;
803 int ret;
804
805 EnterFunction(2);
806
807 if (udest->weight < 0) {
808 IP_VS_ERR("ip_vs_add_dest(): server weight less than zero\n");
809 return -ERANGE;
810 }
811
812 if (udest->l_threshold > udest->u_threshold) {
813 IP_VS_ERR("ip_vs_add_dest(): lower threshold is higher than "
814 "upper threshold\n");
815 return -ERANGE;
816 }
817
818 /*
819 * Check if the dest already exists in the list
820 */
821 dest = ip_vs_lookup_dest(svc, daddr, dport);
822 if (dest != NULL) {
823 IP_VS_DBG(1, "ip_vs_add_dest(): dest already exists\n");
824 return -EEXIST;
825 }
826
827 /*
828 * Check if the dest already exists in the trash and
829 * is from the same service
830 */
831 dest = ip_vs_trash_get_dest(svc, daddr, dport);
832 if (dest != NULL) {
833 IP_VS_DBG(3, "Get destination %u.%u.%u.%u:%u from trash, "
834 "dest->refcnt=%d, service %u/%u.%u.%u.%u:%u\n",
835 NIPQUAD(daddr), ntohs(dport),
836 atomic_read(&dest->refcnt),
837 dest->vfwmark,
838 NIPQUAD(dest->vaddr),
839 ntohs(dest->vport));
840 __ip_vs_update_dest(svc, dest, udest);
841
842 /*
843 * Get the destination from the trash
844 */
845 list_del(&dest->n_list);
846
847 ip_vs_new_estimator(&dest->stats);
848
849 write_lock_bh(&__ip_vs_svc_lock);
850
851 /*
852 * Wait until all other svc users go away.
853 */
854 IP_VS_WAIT_WHILE(atomic_read(&svc->usecnt) > 1);
855
856 list_add(&dest->n_list, &svc->destinations);
857 svc->num_dests++;
858
859 /* call the update_service function of its scheduler */
860 svc->scheduler->update_service(svc);
861
862 write_unlock_bh(&__ip_vs_svc_lock);
863 return 0;
864 }
865
866 /*
867 * Allocate and initialize the dest structure
868 */
869 ret = ip_vs_new_dest(svc, udest, &dest);
870 if (ret) {
871 return ret;
872 }
873
874 /*
875 * Add the dest entry into the list
876 */
877 atomic_inc(&dest->refcnt);
878
879 write_lock_bh(&__ip_vs_svc_lock);
880
881 /*
882 * Wait until all other svc users go away.
883 */
884 IP_VS_WAIT_WHILE(atomic_read(&svc->usecnt) > 1);
885
886 list_add(&dest->n_list, &svc->destinations);
887 svc->num_dests++;
888
889 /* call the update_service function of its scheduler */
890 svc->scheduler->update_service(svc);
891
892 write_unlock_bh(&__ip_vs_svc_lock);
893
894 LeaveFunction(2);
895
896 return 0;
897 }
898
899
900 /*
901 * Edit a destination in the given service
902 */
903 static int
904 ip_vs_edit_dest(struct ip_vs_service *svc, struct ip_vs_dest_user *udest)
905 {
906 struct ip_vs_dest *dest;
907 __be32 daddr = udest->addr;
908 __be16 dport = udest->port;
909
910 EnterFunction(2);
911
912 if (udest->weight < 0) {
913 IP_VS_ERR("ip_vs_edit_dest(): server weight less than zero\n");
914 return -ERANGE;
915 }
916
917 if (udest->l_threshold > udest->u_threshold) {
918 IP_VS_ERR("ip_vs_edit_dest(): lower threshold is higher than "
919 "upper threshold\n");
920 return -ERANGE;
921 }
922
923 /*
924 * Lookup the destination list
925 */
926 dest = ip_vs_lookup_dest(svc, daddr, dport);
927 if (dest == NULL) {
928 IP_VS_DBG(1, "ip_vs_edit_dest(): dest doesn't exist\n");
929 return -ENOENT;
930 }
931
932 __ip_vs_update_dest(svc, dest, udest);
933
934 write_lock_bh(&__ip_vs_svc_lock);
935
936 /* Wait until all other svc users go away */
937 IP_VS_WAIT_WHILE(atomic_read(&svc->usecnt) > 1);
938
939 /* call the update_service, because server weight may be changed */
940 svc->scheduler->update_service(svc);
941
942 write_unlock_bh(&__ip_vs_svc_lock);
943
944 LeaveFunction(2);
945
946 return 0;
947 }
948
949
950 /*
951 * Delete a destination (must be already unlinked from the service)
952 */
953 static void __ip_vs_del_dest(struct ip_vs_dest *dest)
954 {
955 ip_vs_kill_estimator(&dest->stats);
956
957 /*
958 * Remove it from the d-linked list with the real services.
959 */
960 write_lock_bh(&__ip_vs_rs_lock);
961 ip_vs_rs_unhash(dest);
962 write_unlock_bh(&__ip_vs_rs_lock);
963
964 /*
965 * Decrease the refcnt of the dest, and free the dest
966 * if nobody refers to it (refcnt=0). Otherwise, throw
967 * the destination into the trash.
968 */
969 if (atomic_dec_and_test(&dest->refcnt)) {
970 ip_vs_dst_reset(dest);
971 /* simply decrease svc->refcnt here, let the caller check
972 and release the service if nobody refers to it.
973 Only user context can release destination and service,
974 and only one user context can update virtual service at a
975 time, so the operation here is OK */
976 atomic_dec(&dest->svc->refcnt);
977 kfree(dest);
978 } else {
979 IP_VS_DBG(3, "Moving dest %u.%u.%u.%u:%u into trash, "
980 "dest->refcnt=%d\n",
981 NIPQUAD(dest->addr), ntohs(dest->port),
982 atomic_read(&dest->refcnt));
983 list_add(&dest->n_list, &ip_vs_dest_trash);
984 atomic_inc(&dest->refcnt);
985 }
986 }
987
988
989 /*
990 * Unlink a destination from the given service
991 */
992 static void __ip_vs_unlink_dest(struct ip_vs_service *svc,
993 struct ip_vs_dest *dest,
994 int svcupd)
995 {
996 dest->flags &= ~IP_VS_DEST_F_AVAILABLE;
997
998 /*
999 * Remove it from the d-linked destination list.
1000 */
1001 list_del(&dest->n_list);
1002 svc->num_dests--;
1003 if (svcupd) {
1004 /*
1005 * Call the update_service function of its scheduler
1006 */
1007 svc->scheduler->update_service(svc);
1008 }
1009 }
1010
1011
1012 /*
1013 * Delete a destination server in the given service
1014 */
1015 static int
1016 ip_vs_del_dest(struct ip_vs_service *svc,struct ip_vs_dest_user *udest)
1017 {
1018 struct ip_vs_dest *dest;
1019 __be32 daddr = udest->addr;
1020 __be16 dport = udest->port;
1021
1022 EnterFunction(2);
1023
1024 dest = ip_vs_lookup_dest(svc, daddr, dport);
1025 if (dest == NULL) {
1026 IP_VS_DBG(1, "ip_vs_del_dest(): destination not found!\n");
1027 return -ENOENT;
1028 }
1029
1030 write_lock_bh(&__ip_vs_svc_lock);
1031
1032 /*
1033 * Wait until all other svc users go away.
1034 */
1035 IP_VS_WAIT_WHILE(atomic_read(&svc->usecnt) > 1);
1036
1037 /*
1038 * Unlink dest from the service
1039 */
1040 __ip_vs_unlink_dest(svc, dest, 1);
1041
1042 write_unlock_bh(&__ip_vs_svc_lock);
1043
1044 /*
1045 * Delete the destination
1046 */
1047 __ip_vs_del_dest(dest);
1048
1049 LeaveFunction(2);
1050
1051 return 0;
1052 }
1053
1054
1055 /*
1056 * Add a service into the service hash table
1057 */
1058 static int
1059 ip_vs_add_service(struct ip_vs_service_user *u, struct ip_vs_service **svc_p)
1060 {
1061 int ret = 0;
1062 struct ip_vs_scheduler *sched = NULL;
1063 struct ip_vs_service *svc = NULL;
1064
1065 /* increase the module use count */
1066 ip_vs_use_count_inc();
1067
1068 /* Lookup the scheduler by 'u->sched_name' */
1069 sched = ip_vs_scheduler_get(u->sched_name);
1070 if (sched == NULL) {
1071 IP_VS_INFO("Scheduler module ip_vs_%s not found\n",
1072 u->sched_name);
1073 ret = -ENOENT;
1074 goto out_mod_dec;
1075 }
1076
1077 svc = kzalloc(sizeof(struct ip_vs_service), GFP_ATOMIC);
1078 if (svc == NULL) {
1079 IP_VS_DBG(1, "ip_vs_add_service: kmalloc failed.\n");
1080 ret = -ENOMEM;
1081 goto out_err;
1082 }
1083
1084 /* I'm the first user of the service */
1085 atomic_set(&svc->usecnt, 1);
1086 atomic_set(&svc->refcnt, 0);
1087
1088 svc->protocol = u->protocol;
1089 svc->addr = u->addr;
1090 svc->port = u->port;
1091 svc->fwmark = u->fwmark;
1092 svc->flags = u->flags;
1093 svc->timeout = u->timeout * HZ;
1094 svc->netmask = u->netmask;
1095
1096 INIT_LIST_HEAD(&svc->destinations);
1097 rwlock_init(&svc->sched_lock);
1098 spin_lock_init(&svc->stats.lock);
1099
1100 /* Bind the scheduler */
1101 ret = ip_vs_bind_scheduler(svc, sched);
1102 if (ret)
1103 goto out_err;
1104 sched = NULL;
1105
1106 /* Update the virtual service counters */
1107 if (svc->port == FTPPORT)
1108 atomic_inc(&ip_vs_ftpsvc_counter);
1109 else if (svc->port == 0)
1110 atomic_inc(&ip_vs_nullsvc_counter);
1111
1112 ip_vs_new_estimator(&svc->stats);
1113 ip_vs_num_services++;
1114
1115 /* Hash the service into the service table */
1116 write_lock_bh(&__ip_vs_svc_lock);
1117 ip_vs_svc_hash(svc);
1118 write_unlock_bh(&__ip_vs_svc_lock);
1119
1120 *svc_p = svc;
1121 return 0;
1122
1123 out_err:
1124 if (svc != NULL) {
1125 if (svc->scheduler)
1126 ip_vs_unbind_scheduler(svc);
1127 if (svc->inc) {
1128 local_bh_disable();
1129 ip_vs_app_inc_put(svc->inc);
1130 local_bh_enable();
1131 }
1132 kfree(svc);
1133 }
1134 ip_vs_scheduler_put(sched);
1135
1136 out_mod_dec:
1137 /* decrease the module use count */
1138 ip_vs_use_count_dec();
1139
1140 return ret;
1141 }
1142
1143
1144 /*
1145 * Edit a service and bind it with a new scheduler
1146 */
1147 static int
1148 ip_vs_edit_service(struct ip_vs_service *svc, struct ip_vs_service_user *u)
1149 {
1150 struct ip_vs_scheduler *sched, *old_sched;
1151 int ret = 0;
1152
1153 /*
1154 * Lookup the scheduler, by 'u->sched_name'
1155 */
1156 sched = ip_vs_scheduler_get(u->sched_name);
1157 if (sched == NULL) {
1158 IP_VS_INFO("Scheduler module ip_vs_%s not found\n",
1159 u->sched_name);
1160 return -ENOENT;
1161 }
1162 old_sched = sched;
1163
1164 write_lock_bh(&__ip_vs_svc_lock);
1165
1166 /*
1167 * Wait until all other svc users go away.
1168 */
1169 IP_VS_WAIT_WHILE(atomic_read(&svc->usecnt) > 1);
1170
1171 /*
1172 * Set the flags and timeout value
1173 */
1174 svc->flags = u->flags | IP_VS_SVC_F_HASHED;
1175 svc->timeout = u->timeout * HZ;
1176 svc->netmask = u->netmask;
1177
1178 old_sched = svc->scheduler;
1179 if (sched != old_sched) {
1180 /*
1181 * Unbind the old scheduler
1182 */
1183 if ((ret = ip_vs_unbind_scheduler(svc))) {
1184 old_sched = sched;
1185 goto out;
1186 }
1187
1188 /*
1189 * Bind the new scheduler
1190 */
1191 if ((ret = ip_vs_bind_scheduler(svc, sched))) {
1192 /*
1193 * If ip_vs_bind_scheduler fails, restore the old
1194 * scheduler.
1195 * The main reason of failure is out of memory.
1196 *
1197 * The question is if the old scheduler can be
1198 * restored all the time. TODO: if it cannot be
1199 * restored some time, we must delete the service,
1200 * otherwise the system may crash.
1201 */
1202 ip_vs_bind_scheduler(svc, old_sched);
1203 old_sched = sched;
1204 goto out;
1205 }
1206 }
1207
1208 out:
1209 write_unlock_bh(&__ip_vs_svc_lock);
1210
1211 if (old_sched)
1212 ip_vs_scheduler_put(old_sched);
1213
1214 return ret;
1215 }
1216
1217
1218 /*
1219 * Delete a service from the service list
1220 * - The service must be unlinked, unlocked and not referenced!
1221 * - We are called under _bh lock
1222 */
1223 static void __ip_vs_del_service(struct ip_vs_service *svc)
1224 {
1225 struct ip_vs_dest *dest, *nxt;
1226 struct ip_vs_scheduler *old_sched;
1227
1228 ip_vs_num_services--;
1229 ip_vs_kill_estimator(&svc->stats);
1230
1231 /* Unbind scheduler */
1232 old_sched = svc->scheduler;
1233 ip_vs_unbind_scheduler(svc);
1234 if (old_sched)
1235 ip_vs_scheduler_put(old_sched);
1236
1237 /* Unbind app inc */
1238 if (svc->inc) {
1239 ip_vs_app_inc_put(svc->inc);
1240 svc->inc = NULL;
1241 }
1242
1243 /*
1244 * Unlink the whole destination list
1245 */
1246 list_for_each_entry_safe(dest, nxt, &svc->destinations, n_list) {
1247 __ip_vs_unlink_dest(svc, dest, 0);
1248 __ip_vs_del_dest(dest);
1249 }
1250
1251 /*
1252 * Update the virtual service counters
1253 */
1254 if (svc->port == FTPPORT)
1255 atomic_dec(&ip_vs_ftpsvc_counter);
1256 else if (svc->port == 0)
1257 atomic_dec(&ip_vs_nullsvc_counter);
1258
1259 /*
1260 * Free the service if nobody refers to it
1261 */
1262 if (atomic_read(&svc->refcnt) == 0)
1263 kfree(svc);
1264
1265 /* decrease the module use count */
1266 ip_vs_use_count_dec();
1267 }
1268
1269 /*
1270 * Delete a service from the service list
1271 */
1272 static int ip_vs_del_service(struct ip_vs_service *svc)
1273 {
1274 if (svc == NULL)
1275 return -EEXIST;
1276
1277 /*
1278 * Unhash it from the service table
1279 */
1280 write_lock_bh(&__ip_vs_svc_lock);
1281
1282 ip_vs_svc_unhash(svc);
1283
1284 /*
1285 * Wait until all the svc users go away.
1286 */
1287 IP_VS_WAIT_WHILE(atomic_read(&svc->usecnt) > 1);
1288
1289 __ip_vs_del_service(svc);
1290
1291 write_unlock_bh(&__ip_vs_svc_lock);
1292
1293 return 0;
1294 }
1295
1296
1297 /*
1298 * Flush all the virtual services
1299 */
1300 static int ip_vs_flush(void)
1301 {
1302 int idx;
1303 struct ip_vs_service *svc, *nxt;
1304
1305 /*
1306 * Flush the service table hashed by <protocol,addr,port>
1307 */
1308 for(idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
1309 list_for_each_entry_safe(svc, nxt, &ip_vs_svc_table[idx], s_list) {
1310 write_lock_bh(&__ip_vs_svc_lock);
1311 ip_vs_svc_unhash(svc);
1312 /*
1313 * Wait until all the svc users go away.
1314 */
1315 IP_VS_WAIT_WHILE(atomic_read(&svc->usecnt) > 0);
1316 __ip_vs_del_service(svc);
1317 write_unlock_bh(&__ip_vs_svc_lock);
1318 }
1319 }
1320
1321 /*
1322 * Flush the service table hashed by fwmark
1323 */
1324 for(idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
1325 list_for_each_entry_safe(svc, nxt,
1326 &ip_vs_svc_fwm_table[idx], f_list) {
1327 write_lock_bh(&__ip_vs_svc_lock);
1328 ip_vs_svc_unhash(svc);
1329 /*
1330 * Wait until all the svc users go away.
1331 */
1332 IP_VS_WAIT_WHILE(atomic_read(&svc->usecnt) > 0);
1333 __ip_vs_del_service(svc);
1334 write_unlock_bh(&__ip_vs_svc_lock);
1335 }
1336 }
1337
1338 return 0;
1339 }
1340
1341
1342 /*
1343 * Zero counters in a service or all services
1344 */
1345 static int ip_vs_zero_service(struct ip_vs_service *svc)
1346 {
1347 struct ip_vs_dest *dest;
1348
1349 write_lock_bh(&__ip_vs_svc_lock);
1350 list_for_each_entry(dest, &svc->destinations, n_list) {
1351 ip_vs_zero_stats(&dest->stats);
1352 }
1353 ip_vs_zero_stats(&svc->stats);
1354 write_unlock_bh(&__ip_vs_svc_lock);
1355 return 0;
1356 }
1357
1358 static int ip_vs_zero_all(void)
1359 {
1360 int idx;
1361 struct ip_vs_service *svc;
1362
1363 for(idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
1364 list_for_each_entry(svc, &ip_vs_svc_table[idx], s_list) {
1365 ip_vs_zero_service(svc);
1366 }
1367 }
1368
1369 for(idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
1370 list_for_each_entry(svc, &ip_vs_svc_fwm_table[idx], f_list) {
1371 ip_vs_zero_service(svc);
1372 }
1373 }
1374
1375 ip_vs_zero_stats(&ip_vs_stats);
1376 return 0;
1377 }
1378
1379
1380 static int
1381 proc_do_defense_mode(ctl_table *table, int write, struct file * filp,
1382 void __user *buffer, size_t *lenp, loff_t *ppos)
1383 {
1384 int *valp = table->data;
1385 int val = *valp;
1386 int rc;
1387
1388 rc = proc_dointvec(table, write, filp, buffer, lenp, ppos);
1389 if (write && (*valp != val)) {
1390 if ((*valp < 0) || (*valp > 3)) {
1391 /* Restore the correct value */
1392 *valp = val;
1393 } else {
1394 update_defense_level();
1395 }
1396 }
1397 return rc;
1398 }
1399
1400
1401 static int
1402 proc_do_sync_threshold(ctl_table *table, int write, struct file *filp,
1403 void __user *buffer, size_t *lenp, loff_t *ppos)
1404 {
1405 int *valp = table->data;
1406 int val[2];
1407 int rc;
1408
1409 /* backup the value first */
1410 memcpy(val, valp, sizeof(val));
1411
1412 rc = proc_dointvec(table, write, filp, buffer, lenp, ppos);
1413 if (write && (valp[0] < 0 || valp[1] < 0 || valp[0] >= valp[1])) {
1414 /* Restore the correct value */
1415 memcpy(valp, val, sizeof(val));
1416 }
1417 return rc;
1418 }
1419
1420
1421 /*
1422 * IPVS sysctl table (under the /proc/sys/net/ipv4/vs/)
1423 */
1424
1425 static struct ctl_table vs_vars[] = {
1426 {
1427 .procname = "amemthresh",
1428 .data = &sysctl_ip_vs_amemthresh,
1429 .maxlen = sizeof(int),
1430 .mode = 0644,
1431 .proc_handler = &proc_dointvec,
1432 },
1433 #ifdef CONFIG_IP_VS_DEBUG
1434 {
1435 .procname = "debug_level",
1436 .data = &sysctl_ip_vs_debug_level,
1437 .maxlen = sizeof(int),
1438 .mode = 0644,
1439 .proc_handler = &proc_dointvec,
1440 },
1441 #endif
1442 {
1443 .procname = "am_droprate",
1444 .data = &sysctl_ip_vs_am_droprate,
1445 .maxlen = sizeof(int),
1446 .mode = 0644,
1447 .proc_handler = &proc_dointvec,
1448 },
1449 {
1450 .procname = "drop_entry",
1451 .data = &sysctl_ip_vs_drop_entry,
1452 .maxlen = sizeof(int),
1453 .mode = 0644,
1454 .proc_handler = &proc_do_defense_mode,
1455 },
1456 {
1457 .procname = "drop_packet",
1458 .data = &sysctl_ip_vs_drop_packet,
1459 .maxlen = sizeof(int),
1460 .mode = 0644,
1461 .proc_handler = &proc_do_defense_mode,
1462 },
1463 {
1464 .procname = "secure_tcp",
1465 .data = &sysctl_ip_vs_secure_tcp,
1466 .maxlen = sizeof(int),
1467 .mode = 0644,
1468 .proc_handler = &proc_do_defense_mode,
1469 },
1470 #if 0
1471 {
1472 .procname = "timeout_established",
1473 .data = &vs_timeout_table_dos.timeout[IP_VS_S_ESTABLISHED],
1474 .maxlen = sizeof(int),
1475 .mode = 0644,
1476 .proc_handler = &proc_dointvec_jiffies,
1477 },
1478 {
1479 .procname = "timeout_synsent",
1480 .data = &vs_timeout_table_dos.timeout[IP_VS_S_SYN_SENT],
1481 .maxlen = sizeof(int),
1482 .mode = 0644,
1483 .proc_handler = &proc_dointvec_jiffies,
1484 },
1485 {
1486 .procname = "timeout_synrecv",
1487 .data = &vs_timeout_table_dos.timeout[IP_VS_S_SYN_RECV],
1488 .maxlen = sizeof(int),
1489 .mode = 0644,
1490 .proc_handler = &proc_dointvec_jiffies,
1491 },
1492 {
1493 .procname = "timeout_finwait",
1494 .data = &vs_timeout_table_dos.timeout[IP_VS_S_FIN_WAIT],
1495 .maxlen = sizeof(int),
1496 .mode = 0644,
1497 .proc_handler = &proc_dointvec_jiffies,
1498 },
1499 {
1500 .procname = "timeout_timewait",
1501 .data = &vs_timeout_table_dos.timeout[IP_VS_S_TIME_WAIT],
1502 .maxlen = sizeof(int),
1503 .mode = 0644,
1504 .proc_handler = &proc_dointvec_jiffies,
1505 },
1506 {
1507 .procname = "timeout_close",
1508 .data = &vs_timeout_table_dos.timeout[IP_VS_S_CLOSE],
1509 .maxlen = sizeof(int),
1510 .mode = 0644,
1511 .proc_handler = &proc_dointvec_jiffies,
1512 },
1513 {
1514 .procname = "timeout_closewait",
1515 .data = &vs_timeout_table_dos.timeout[IP_VS_S_CLOSE_WAIT],
1516 .maxlen = sizeof(int),
1517 .mode = 0644,
1518 .proc_handler = &proc_dointvec_jiffies,
1519 },
1520 {
1521 .procname = "timeout_lastack",
1522 .data = &vs_timeout_table_dos.timeout[IP_VS_S_LAST_ACK],
1523 .maxlen = sizeof(int),
1524 .mode = 0644,
1525 .proc_handler = &proc_dointvec_jiffies,
1526 },
1527 {
1528 .procname = "timeout_listen",
1529 .data = &vs_timeout_table_dos.timeout[IP_VS_S_LISTEN],
1530 .maxlen = sizeof(int),
1531 .mode = 0644,
1532 .proc_handler = &proc_dointvec_jiffies,
1533 },
1534 {
1535 .procname = "timeout_synack",
1536 .data = &vs_timeout_table_dos.timeout[IP_VS_S_SYNACK],
1537 .maxlen = sizeof(int),
1538 .mode = 0644,
1539 .proc_handler = &proc_dointvec_jiffies,
1540 },
1541 {
1542 .procname = "timeout_udp",
1543 .data = &vs_timeout_table_dos.timeout[IP_VS_S_UDP],
1544 .maxlen = sizeof(int),
1545 .mode = 0644,
1546 .proc_handler = &proc_dointvec_jiffies,
1547 },
1548 {
1549 .procname = "timeout_icmp",
1550 .data = &vs_timeout_table_dos.timeout[IP_VS_S_ICMP],
1551 .maxlen = sizeof(int),
1552 .mode = 0644,
1553 .proc_handler = &proc_dointvec_jiffies,
1554 },
1555 #endif
1556 {
1557 .procname = "cache_bypass",
1558 .data = &sysctl_ip_vs_cache_bypass,
1559 .maxlen = sizeof(int),
1560 .mode = 0644,
1561 .proc_handler = &proc_dointvec,
1562 },
1563 {
1564 .procname = "expire_nodest_conn",
1565 .data = &sysctl_ip_vs_expire_nodest_conn,
1566 .maxlen = sizeof(int),
1567 .mode = 0644,
1568 .proc_handler = &proc_dointvec,
1569 },
1570 {
1571 .procname = "expire_quiescent_template",
1572 .data = &sysctl_ip_vs_expire_quiescent_template,
1573 .maxlen = sizeof(int),
1574 .mode = 0644,
1575 .proc_handler = &proc_dointvec,
1576 },
1577 {
1578 .procname = "sync_threshold",
1579 .data = &sysctl_ip_vs_sync_threshold,
1580 .maxlen = sizeof(sysctl_ip_vs_sync_threshold),
1581 .mode = 0644,
1582 .proc_handler = &proc_do_sync_threshold,
1583 },
1584 {
1585 .procname = "nat_icmp_send",
1586 .data = &sysctl_ip_vs_nat_icmp_send,
1587 .maxlen = sizeof(int),
1588 .mode = 0644,
1589 .proc_handler = &proc_dointvec,
1590 },
1591 { .ctl_name = 0 }
1592 };
1593
1594 struct ctl_path net_vs_ctl_path[] = {
1595 { .procname = "net", .ctl_name = CTL_NET, },
1596 { .procname = "ipv4", .ctl_name = NET_IPV4, },
1597 { .procname = "vs", },
1598 { }
1599 };
1600 EXPORT_SYMBOL_GPL(net_vs_ctl_path);
1601
1602 static struct ctl_table_header * sysctl_header;
1603
1604 #ifdef CONFIG_PROC_FS
1605
1606 struct ip_vs_iter {
1607 struct list_head *table;
1608 int bucket;
1609 };
1610
1611 /*
1612 * Write the contents of the VS rule table to a PROCfs file.
1613 * (It is kept just for backward compatibility)
1614 */
1615 static inline const char *ip_vs_fwd_name(unsigned flags)
1616 {
1617 switch (flags & IP_VS_CONN_F_FWD_MASK) {
1618 case IP_VS_CONN_F_LOCALNODE:
1619 return "Local";
1620 case IP_VS_CONN_F_TUNNEL:
1621 return "Tunnel";
1622 case IP_VS_CONN_F_DROUTE:
1623 return "Route";
1624 default:
1625 return "Masq";
1626 }
1627 }
1628
1629
1630 /* Get the Nth entry in the two lists */
1631 static struct ip_vs_service *ip_vs_info_array(struct seq_file *seq, loff_t pos)
1632 {
1633 struct ip_vs_iter *iter = seq->private;
1634 int idx;
1635 struct ip_vs_service *svc;
1636
1637 /* look in hash by protocol */
1638 for (idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
1639 list_for_each_entry(svc, &ip_vs_svc_table[idx], s_list) {
1640 if (pos-- == 0){
1641 iter->table = ip_vs_svc_table;
1642 iter->bucket = idx;
1643 return svc;
1644 }
1645 }
1646 }
1647
1648 /* keep looking in fwmark */
1649 for (idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
1650 list_for_each_entry(svc, &ip_vs_svc_fwm_table[idx], f_list) {
1651 if (pos-- == 0) {
1652 iter->table = ip_vs_svc_fwm_table;
1653 iter->bucket = idx;
1654 return svc;
1655 }
1656 }
1657 }
1658
1659 return NULL;
1660 }
1661
1662 static void *ip_vs_info_seq_start(struct seq_file *seq, loff_t *pos)
1663 {
1664
1665 read_lock_bh(&__ip_vs_svc_lock);
1666 return *pos ? ip_vs_info_array(seq, *pos - 1) : SEQ_START_TOKEN;
1667 }
1668
1669
1670 static void *ip_vs_info_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1671 {
1672 struct list_head *e;
1673 struct ip_vs_iter *iter;
1674 struct ip_vs_service *svc;
1675
1676 ++*pos;
1677 if (v == SEQ_START_TOKEN)
1678 return ip_vs_info_array(seq,0);
1679
1680 svc = v;
1681 iter = seq->private;
1682
1683 if (iter->table == ip_vs_svc_table) {
1684 /* next service in table hashed by protocol */
1685 if ((e = svc->s_list.next) != &ip_vs_svc_table[iter->bucket])
1686 return list_entry(e, struct ip_vs_service, s_list);
1687
1688
1689 while (++iter->bucket < IP_VS_SVC_TAB_SIZE) {
1690 list_for_each_entry(svc,&ip_vs_svc_table[iter->bucket],
1691 s_list) {
1692 return svc;
1693 }
1694 }
1695
1696 iter->table = ip_vs_svc_fwm_table;
1697 iter->bucket = -1;
1698 goto scan_fwmark;
1699 }
1700
1701 /* next service in hashed by fwmark */
1702 if ((e = svc->f_list.next) != &ip_vs_svc_fwm_table[iter->bucket])
1703 return list_entry(e, struct ip_vs_service, f_list);
1704
1705 scan_fwmark:
1706 while (++iter->bucket < IP_VS_SVC_TAB_SIZE) {
1707 list_for_each_entry(svc, &ip_vs_svc_fwm_table[iter->bucket],
1708 f_list)
1709 return svc;
1710 }
1711
1712 return NULL;
1713 }
1714
1715 static void ip_vs_info_seq_stop(struct seq_file *seq, void *v)
1716 {
1717 read_unlock_bh(&__ip_vs_svc_lock);
1718 }
1719
1720
1721 static int ip_vs_info_seq_show(struct seq_file *seq, void *v)
1722 {
1723 if (v == SEQ_START_TOKEN) {
1724 seq_printf(seq,
1725 "IP Virtual Server version %d.%d.%d (size=%d)\n",
1726 NVERSION(IP_VS_VERSION_CODE), IP_VS_CONN_TAB_SIZE);
1727 seq_puts(seq,
1728 "Prot LocalAddress:Port Scheduler Flags\n");
1729 seq_puts(seq,
1730 " -> RemoteAddress:Port Forward Weight ActiveConn InActConn\n");
1731 } else {
1732 const struct ip_vs_service *svc = v;
1733 const struct ip_vs_iter *iter = seq->private;
1734 const struct ip_vs_dest *dest;
1735
1736 if (iter->table == ip_vs_svc_table)
1737 seq_printf(seq, "%s %08X:%04X %s ",
1738 ip_vs_proto_name(svc->protocol),
1739 ntohl(svc->addr),
1740 ntohs(svc->port),
1741 svc->scheduler->name);
1742 else
1743 seq_printf(seq, "FWM %08X %s ",
1744 svc->fwmark, svc->scheduler->name);
1745
1746 if (svc->flags & IP_VS_SVC_F_PERSISTENT)
1747 seq_printf(seq, "persistent %d %08X\n",
1748 svc->timeout,
1749 ntohl(svc->netmask));
1750 else
1751 seq_putc(seq, '\n');
1752
1753 list_for_each_entry(dest, &svc->destinations, n_list) {
1754 seq_printf(seq,
1755 " -> %08X:%04X %-7s %-6d %-10d %-10d\n",
1756 ntohl(dest->addr), ntohs(dest->port),
1757 ip_vs_fwd_name(atomic_read(&dest->conn_flags)),
1758 atomic_read(&dest->weight),
1759 atomic_read(&dest->activeconns),
1760 atomic_read(&dest->inactconns));
1761 }
1762 }
1763 return 0;
1764 }
1765
1766 static const struct seq_operations ip_vs_info_seq_ops = {
1767 .start = ip_vs_info_seq_start,
1768 .next = ip_vs_info_seq_next,
1769 .stop = ip_vs_info_seq_stop,
1770 .show = ip_vs_info_seq_show,
1771 };
1772
1773 static int ip_vs_info_open(struct inode *inode, struct file *file)
1774 {
1775 return seq_open_private(file, &ip_vs_info_seq_ops,
1776 sizeof(struct ip_vs_iter));
1777 }
1778
1779 static const struct file_operations ip_vs_info_fops = {
1780 .owner = THIS_MODULE,
1781 .open = ip_vs_info_open,
1782 .read = seq_read,
1783 .llseek = seq_lseek,
1784 .release = seq_release_private,
1785 };
1786
1787 #endif
1788
1789 struct ip_vs_stats ip_vs_stats;
1790
1791 #ifdef CONFIG_PROC_FS
1792 static int ip_vs_stats_show(struct seq_file *seq, void *v)
1793 {
1794
1795 /* 01234567 01234567 01234567 0123456701234567 0123456701234567 */
1796 seq_puts(seq,
1797 " Total Incoming Outgoing Incoming Outgoing\n");
1798 seq_printf(seq,
1799 " Conns Packets Packets Bytes Bytes\n");
1800
1801 spin_lock_bh(&ip_vs_stats.lock);
1802 seq_printf(seq, "%8X %8X %8X %16LX %16LX\n\n", ip_vs_stats.conns,
1803 ip_vs_stats.inpkts, ip_vs_stats.outpkts,
1804 (unsigned long long) ip_vs_stats.inbytes,
1805 (unsigned long long) ip_vs_stats.outbytes);
1806
1807 /* 01234567 01234567 01234567 0123456701234567 0123456701234567 */
1808 seq_puts(seq,
1809 " Conns/s Pkts/s Pkts/s Bytes/s Bytes/s\n");
1810 seq_printf(seq,"%8X %8X %8X %16X %16X\n",
1811 ip_vs_stats.cps,
1812 ip_vs_stats.inpps,
1813 ip_vs_stats.outpps,
1814 ip_vs_stats.inbps,
1815 ip_vs_stats.outbps);
1816 spin_unlock_bh(&ip_vs_stats.lock);
1817
1818 return 0;
1819 }
1820
1821 static int ip_vs_stats_seq_open(struct inode *inode, struct file *file)
1822 {
1823 return single_open(file, ip_vs_stats_show, NULL);
1824 }
1825
1826 static const struct file_operations ip_vs_stats_fops = {
1827 .owner = THIS_MODULE,
1828 .open = ip_vs_stats_seq_open,
1829 .read = seq_read,
1830 .llseek = seq_lseek,
1831 .release = single_release,
1832 };
1833
1834 #endif
1835
1836 /*
1837 * Set timeout values for tcp tcpfin udp in the timeout_table.
1838 */
1839 static int ip_vs_set_timeout(struct ip_vs_timeout_user *u)
1840 {
1841 IP_VS_DBG(2, "Setting timeout tcp:%d tcpfin:%d udp:%d\n",
1842 u->tcp_timeout,
1843 u->tcp_fin_timeout,
1844 u->udp_timeout);
1845
1846 #ifdef CONFIG_IP_VS_PROTO_TCP
1847 if (u->tcp_timeout) {
1848 ip_vs_protocol_tcp.timeout_table[IP_VS_TCP_S_ESTABLISHED]
1849 = u->tcp_timeout * HZ;
1850 }
1851
1852 if (u->tcp_fin_timeout) {
1853 ip_vs_protocol_tcp.timeout_table[IP_VS_TCP_S_FIN_WAIT]
1854 = u->tcp_fin_timeout * HZ;
1855 }
1856 #endif
1857
1858 #ifdef CONFIG_IP_VS_PROTO_UDP
1859 if (u->udp_timeout) {
1860 ip_vs_protocol_udp.timeout_table[IP_VS_UDP_S_NORMAL]
1861 = u->udp_timeout * HZ;
1862 }
1863 #endif
1864 return 0;
1865 }
1866
1867
1868 #define SET_CMDID(cmd) (cmd - IP_VS_BASE_CTL)
1869 #define SERVICE_ARG_LEN (sizeof(struct ip_vs_service_user))
1870 #define SVCDEST_ARG_LEN (sizeof(struct ip_vs_service_user) + \
1871 sizeof(struct ip_vs_dest_user))
1872 #define TIMEOUT_ARG_LEN (sizeof(struct ip_vs_timeout_user))
1873 #define DAEMON_ARG_LEN (sizeof(struct ip_vs_daemon_user))
1874 #define MAX_ARG_LEN SVCDEST_ARG_LEN
1875
1876 static const unsigned char set_arglen[SET_CMDID(IP_VS_SO_SET_MAX)+1] = {
1877 [SET_CMDID(IP_VS_SO_SET_ADD)] = SERVICE_ARG_LEN,
1878 [SET_CMDID(IP_VS_SO_SET_EDIT)] = SERVICE_ARG_LEN,
1879 [SET_CMDID(IP_VS_SO_SET_DEL)] = SERVICE_ARG_LEN,
1880 [SET_CMDID(IP_VS_SO_SET_FLUSH)] = 0,
1881 [SET_CMDID(IP_VS_SO_SET_ADDDEST)] = SVCDEST_ARG_LEN,
1882 [SET_CMDID(IP_VS_SO_SET_DELDEST)] = SVCDEST_ARG_LEN,
1883 [SET_CMDID(IP_VS_SO_SET_EDITDEST)] = SVCDEST_ARG_LEN,
1884 [SET_CMDID(IP_VS_SO_SET_TIMEOUT)] = TIMEOUT_ARG_LEN,
1885 [SET_CMDID(IP_VS_SO_SET_STARTDAEMON)] = DAEMON_ARG_LEN,
1886 [SET_CMDID(IP_VS_SO_SET_STOPDAEMON)] = DAEMON_ARG_LEN,
1887 [SET_CMDID(IP_VS_SO_SET_ZERO)] = SERVICE_ARG_LEN,
1888 };
1889
1890 static int
1891 do_ip_vs_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len)
1892 {
1893 int ret;
1894 unsigned char arg[MAX_ARG_LEN];
1895 struct ip_vs_service_user *usvc;
1896 struct ip_vs_service *svc;
1897 struct ip_vs_dest_user *udest;
1898
1899 if (!capable(CAP_NET_ADMIN))
1900 return -EPERM;
1901
1902 if (len != set_arglen[SET_CMDID(cmd)]) {
1903 IP_VS_ERR("set_ctl: len %u != %u\n",
1904 len, set_arglen[SET_CMDID(cmd)]);
1905 return -EINVAL;
1906 }
1907
1908 if (copy_from_user(arg, user, len) != 0)
1909 return -EFAULT;
1910
1911 /* increase the module use count */
1912 ip_vs_use_count_inc();
1913
1914 if (mutex_lock_interruptible(&__ip_vs_mutex)) {
1915 ret = -ERESTARTSYS;
1916 goto out_dec;
1917 }
1918
1919 if (cmd == IP_VS_SO_SET_FLUSH) {
1920 /* Flush the virtual service */
1921 ret = ip_vs_flush();
1922 goto out_unlock;
1923 } else if (cmd == IP_VS_SO_SET_TIMEOUT) {
1924 /* Set timeout values for (tcp tcpfin udp) */
1925 ret = ip_vs_set_timeout((struct ip_vs_timeout_user *)arg);
1926 goto out_unlock;
1927 } else if (cmd == IP_VS_SO_SET_STARTDAEMON) {
1928 struct ip_vs_daemon_user *dm = (struct ip_vs_daemon_user *)arg;
1929 ret = start_sync_thread(dm->state, dm->mcast_ifn, dm->syncid);
1930 goto out_unlock;
1931 } else if (cmd == IP_VS_SO_SET_STOPDAEMON) {
1932 struct ip_vs_daemon_user *dm = (struct ip_vs_daemon_user *)arg;
1933 ret = stop_sync_thread(dm->state);
1934 goto out_unlock;
1935 }
1936
1937 usvc = (struct ip_vs_service_user *)arg;
1938 udest = (struct ip_vs_dest_user *)(usvc + 1);
1939
1940 if (cmd == IP_VS_SO_SET_ZERO) {
1941 /* if no service address is set, zero counters in all */
1942 if (!usvc->fwmark && !usvc->addr && !usvc->port) {
1943 ret = ip_vs_zero_all();
1944 goto out_unlock;
1945 }
1946 }
1947
1948 /* Check for valid protocol: TCP or UDP, even for fwmark!=0 */
1949 if (usvc->protocol!=IPPROTO_TCP && usvc->protocol!=IPPROTO_UDP) {
1950 IP_VS_ERR("set_ctl: invalid protocol: %d %d.%d.%d.%d:%d %s\n",
1951 usvc->protocol, NIPQUAD(usvc->addr),
1952 ntohs(usvc->port), usvc->sched_name);
1953 ret = -EFAULT;
1954 goto out_unlock;
1955 }
1956
1957 /* Lookup the exact service by <protocol, addr, port> or fwmark */
1958 if (usvc->fwmark == 0)
1959 svc = __ip_vs_service_get(usvc->protocol,
1960 usvc->addr, usvc->port);
1961 else
1962 svc = __ip_vs_svc_fwm_get(usvc->fwmark);
1963
1964 if (cmd != IP_VS_SO_SET_ADD
1965 && (svc == NULL || svc->protocol != usvc->protocol)) {
1966 ret = -ESRCH;
1967 goto out_unlock;
1968 }
1969
1970 switch (cmd) {
1971 case IP_VS_SO_SET_ADD:
1972 if (svc != NULL)
1973 ret = -EEXIST;
1974 else
1975 ret = ip_vs_add_service(usvc, &svc);
1976 break;
1977 case IP_VS_SO_SET_EDIT:
1978 ret = ip_vs_edit_service(svc, usvc);
1979 break;
1980 case IP_VS_SO_SET_DEL:
1981 ret = ip_vs_del_service(svc);
1982 if (!ret)
1983 goto out_unlock;
1984 break;
1985 case IP_VS_SO_SET_ZERO:
1986 ret = ip_vs_zero_service(svc);
1987 break;
1988 case IP_VS_SO_SET_ADDDEST:
1989 ret = ip_vs_add_dest(svc, udest);
1990 break;
1991 case IP_VS_SO_SET_EDITDEST:
1992 ret = ip_vs_edit_dest(svc, udest);
1993 break;
1994 case IP_VS_SO_SET_DELDEST:
1995 ret = ip_vs_del_dest(svc, udest);
1996 break;
1997 default:
1998 ret = -EINVAL;
1999 }
2000
2001 if (svc)
2002 ip_vs_service_put(svc);
2003
2004 out_unlock:
2005 mutex_unlock(&__ip_vs_mutex);
2006 out_dec:
2007 /* decrease the module use count */
2008 ip_vs_use_count_dec();
2009
2010 return ret;
2011 }
2012
2013
2014 static void
2015 ip_vs_copy_stats(struct ip_vs_stats_user *dst, struct ip_vs_stats *src)
2016 {
2017 spin_lock_bh(&src->lock);
2018 memcpy(dst, src, (char*)&src->lock - (char*)src);
2019 spin_unlock_bh(&src->lock);
2020 }
2021
2022 static void
2023 ip_vs_copy_service(struct ip_vs_service_entry *dst, struct ip_vs_service *src)
2024 {
2025 dst->protocol = src->protocol;
2026 dst->addr = src->addr;
2027 dst->port = src->port;
2028 dst->fwmark = src->fwmark;
2029 strlcpy(dst->sched_name, src->scheduler->name, sizeof(dst->sched_name));
2030 dst->flags = src->flags;
2031 dst->timeout = src->timeout / HZ;
2032 dst->netmask = src->netmask;
2033 dst->num_dests = src->num_dests;
2034 ip_vs_copy_stats(&dst->stats, &src->stats);
2035 }
2036
2037 static inline int
2038 __ip_vs_get_service_entries(const struct ip_vs_get_services *get,
2039 struct ip_vs_get_services __user *uptr)
2040 {
2041 int idx, count=0;
2042 struct ip_vs_service *svc;
2043 struct ip_vs_service_entry entry;
2044 int ret = 0;
2045
2046 for (idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
2047 list_for_each_entry(svc, &ip_vs_svc_table[idx], s_list) {
2048 if (count >= get->num_services)
2049 goto out;
2050 memset(&entry, 0, sizeof(entry));
2051 ip_vs_copy_service(&entry, svc);
2052 if (copy_to_user(&uptr->entrytable[count],
2053 &entry, sizeof(entry))) {
2054 ret = -EFAULT;
2055 goto out;
2056 }
2057 count++;
2058 }
2059 }
2060
2061 for (idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
2062 list_for_each_entry(svc, &ip_vs_svc_fwm_table[idx], f_list) {
2063 if (count >= get->num_services)
2064 goto out;
2065 memset(&entry, 0, sizeof(entry));
2066 ip_vs_copy_service(&entry, svc);
2067 if (copy_to_user(&uptr->entrytable[count],
2068 &entry, sizeof(entry))) {
2069 ret = -EFAULT;
2070 goto out;
2071 }
2072 count++;
2073 }
2074 }
2075 out:
2076 return ret;
2077 }
2078
2079 static inline int
2080 __ip_vs_get_dest_entries(const struct ip_vs_get_dests *get,
2081 struct ip_vs_get_dests __user *uptr)
2082 {
2083 struct ip_vs_service *svc;
2084 int ret = 0;
2085
2086 if (get->fwmark)
2087 svc = __ip_vs_svc_fwm_get(get->fwmark);
2088 else
2089 svc = __ip_vs_service_get(get->protocol,
2090 get->addr, get->port);
2091 if (svc) {
2092 int count = 0;
2093 struct ip_vs_dest *dest;
2094 struct ip_vs_dest_entry entry;
2095
2096 list_for_each_entry(dest, &svc->destinations, n_list) {
2097 if (count >= get->num_dests)
2098 break;
2099
2100 entry.addr = dest->addr;
2101 entry.port = dest->port;
2102 entry.conn_flags = atomic_read(&dest->conn_flags);
2103 entry.weight = atomic_read(&dest->weight);
2104 entry.u_threshold = dest->u_threshold;
2105 entry.l_threshold = dest->l_threshold;
2106 entry.activeconns = atomic_read(&dest->activeconns);
2107 entry.inactconns = atomic_read(&dest->inactconns);
2108 entry.persistconns = atomic_read(&dest->persistconns);
2109 ip_vs_copy_stats(&entry.stats, &dest->stats);
2110 if (copy_to_user(&uptr->entrytable[count],
2111 &entry, sizeof(entry))) {
2112 ret = -EFAULT;
2113 break;
2114 }
2115 count++;
2116 }
2117 ip_vs_service_put(svc);
2118 } else
2119 ret = -ESRCH;
2120 return ret;
2121 }
2122
2123 static inline void
2124 __ip_vs_get_timeouts(struct ip_vs_timeout_user *u)
2125 {
2126 #ifdef CONFIG_IP_VS_PROTO_TCP
2127 u->tcp_timeout =
2128 ip_vs_protocol_tcp.timeout_table[IP_VS_TCP_S_ESTABLISHED] / HZ;
2129 u->tcp_fin_timeout =
2130 ip_vs_protocol_tcp.timeout_table[IP_VS_TCP_S_FIN_WAIT] / HZ;
2131 #endif
2132 #ifdef CONFIG_IP_VS_PROTO_UDP
2133 u->udp_timeout =
2134 ip_vs_protocol_udp.timeout_table[IP_VS_UDP_S_NORMAL] / HZ;
2135 #endif
2136 }
2137
2138
2139 #define GET_CMDID(cmd) (cmd - IP_VS_BASE_CTL)
2140 #define GET_INFO_ARG_LEN (sizeof(struct ip_vs_getinfo))
2141 #define GET_SERVICES_ARG_LEN (sizeof(struct ip_vs_get_services))
2142 #define GET_SERVICE_ARG_LEN (sizeof(struct ip_vs_service_entry))
2143 #define GET_DESTS_ARG_LEN (sizeof(struct ip_vs_get_dests))
2144 #define GET_TIMEOUT_ARG_LEN (sizeof(struct ip_vs_timeout_user))
2145 #define GET_DAEMON_ARG_LEN (sizeof(struct ip_vs_daemon_user) * 2)
2146
2147 static const unsigned char get_arglen[GET_CMDID(IP_VS_SO_GET_MAX)+1] = {
2148 [GET_CMDID(IP_VS_SO_GET_VERSION)] = 64,
2149 [GET_CMDID(IP_VS_SO_GET_INFO)] = GET_INFO_ARG_LEN,
2150 [GET_CMDID(IP_VS_SO_GET_SERVICES)] = GET_SERVICES_ARG_LEN,
2151 [GET_CMDID(IP_VS_SO_GET_SERVICE)] = GET_SERVICE_ARG_LEN,
2152 [GET_CMDID(IP_VS_SO_GET_DESTS)] = GET_DESTS_ARG_LEN,
2153 [GET_CMDID(IP_VS_SO_GET_TIMEOUT)] = GET_TIMEOUT_ARG_LEN,
2154 [GET_CMDID(IP_VS_SO_GET_DAEMON)] = GET_DAEMON_ARG_LEN,
2155 };
2156
2157 static int
2158 do_ip_vs_get_ctl(struct sock *sk, int cmd, void __user *user, int *len)
2159 {
2160 unsigned char arg[128];
2161 int ret = 0;
2162
2163 if (!capable(CAP_NET_ADMIN))
2164 return -EPERM;
2165
2166 if (*len < get_arglen[GET_CMDID(cmd)]) {
2167 IP_VS_ERR("get_ctl: len %u < %u\n",
2168 *len, get_arglen[GET_CMDID(cmd)]);
2169 return -EINVAL;
2170 }
2171
2172 if (copy_from_user(arg, user, get_arglen[GET_CMDID(cmd)]) != 0)
2173 return -EFAULT;
2174
2175 if (mutex_lock_interruptible(&__ip_vs_mutex))
2176 return -ERESTARTSYS;
2177
2178 switch (cmd) {
2179 case IP_VS_SO_GET_VERSION:
2180 {
2181 char buf[64];
2182
2183 sprintf(buf, "IP Virtual Server version %d.%d.%d (size=%d)",
2184 NVERSION(IP_VS_VERSION_CODE), IP_VS_CONN_TAB_SIZE);
2185 if (copy_to_user(user, buf, strlen(buf)+1) != 0) {
2186 ret = -EFAULT;
2187 goto out;
2188 }
2189 *len = strlen(buf)+1;
2190 }
2191 break;
2192
2193 case IP_VS_SO_GET_INFO:
2194 {
2195 struct ip_vs_getinfo info;
2196 info.version = IP_VS_VERSION_CODE;
2197 info.size = IP_VS_CONN_TAB_SIZE;
2198 info.num_services = ip_vs_num_services;
2199 if (copy_to_user(user, &info, sizeof(info)) != 0)
2200 ret = -EFAULT;
2201 }
2202 break;
2203
2204 case IP_VS_SO_GET_SERVICES:
2205 {
2206 struct ip_vs_get_services *get;
2207 int size;
2208
2209 get = (struct ip_vs_get_services *)arg;
2210 size = sizeof(*get) +
2211 sizeof(struct ip_vs_service_entry) * get->num_services;
2212 if (*len != size) {
2213 IP_VS_ERR("length: %u != %u\n", *len, size);
2214 ret = -EINVAL;
2215 goto out;
2216 }
2217 ret = __ip_vs_get_service_entries(get, user);
2218 }
2219 break;
2220
2221 case IP_VS_SO_GET_SERVICE:
2222 {
2223 struct ip_vs_service_entry *entry;
2224 struct ip_vs_service *svc;
2225
2226 entry = (struct ip_vs_service_entry *)arg;
2227 if (entry->fwmark)
2228 svc = __ip_vs_svc_fwm_get(entry->fwmark);
2229 else
2230 svc = __ip_vs_service_get(entry->protocol,
2231 entry->addr, entry->port);
2232 if (svc) {
2233 ip_vs_copy_service(entry, svc);
2234 if (copy_to_user(user, entry, sizeof(*entry)) != 0)
2235 ret = -EFAULT;
2236 ip_vs_service_put(svc);
2237 } else
2238 ret = -ESRCH;
2239 }
2240 break;
2241
2242 case IP_VS_SO_GET_DESTS:
2243 {
2244 struct ip_vs_get_dests *get;
2245 int size;
2246
2247 get = (struct ip_vs_get_dests *)arg;
2248 size = sizeof(*get) +
2249 sizeof(struct ip_vs_dest_entry) * get->num_dests;
2250 if (*len != size) {
2251 IP_VS_ERR("length: %u != %u\n", *len, size);
2252 ret = -EINVAL;
2253 goto out;
2254 }
2255 ret = __ip_vs_get_dest_entries(get, user);
2256 }
2257 break;
2258
2259 case IP_VS_SO_GET_TIMEOUT:
2260 {
2261 struct ip_vs_timeout_user t;
2262
2263 __ip_vs_get_timeouts(&t);
2264 if (copy_to_user(user, &t, sizeof(t)) != 0)
2265 ret = -EFAULT;
2266 }
2267 break;
2268
2269 case IP_VS_SO_GET_DAEMON:
2270 {
2271 struct ip_vs_daemon_user d[2];
2272
2273 memset(&d, 0, sizeof(d));
2274 if (ip_vs_sync_state & IP_VS_STATE_MASTER) {
2275 d[0].state = IP_VS_STATE_MASTER;
2276 strlcpy(d[0].mcast_ifn, ip_vs_master_mcast_ifn, sizeof(d[0].mcast_ifn));
2277 d[0].syncid = ip_vs_master_syncid;
2278 }
2279 if (ip_vs_sync_state & IP_VS_STATE_BACKUP) {
2280 d[1].state = IP_VS_STATE_BACKUP;
2281 strlcpy(d[1].mcast_ifn, ip_vs_backup_mcast_ifn, sizeof(d[1].mcast_ifn));
2282 d[1].syncid = ip_vs_backup_syncid;
2283 }
2284 if (copy_to_user(user, &d, sizeof(d)) != 0)
2285 ret = -EFAULT;
2286 }
2287 break;
2288
2289 default:
2290 ret = -EINVAL;
2291 }
2292
2293 out:
2294 mutex_unlock(&__ip_vs_mutex);
2295 return ret;
2296 }
2297
2298
2299 static struct nf_sockopt_ops ip_vs_sockopts = {
2300 .pf = PF_INET,
2301 .set_optmin = IP_VS_BASE_CTL,
2302 .set_optmax = IP_VS_SO_SET_MAX+1,
2303 .set = do_ip_vs_set_ctl,
2304 .get_optmin = IP_VS_BASE_CTL,
2305 .get_optmax = IP_VS_SO_GET_MAX+1,
2306 .get = do_ip_vs_get_ctl,
2307 .owner = THIS_MODULE,
2308 };
2309
2310
2311 int ip_vs_control_init(void)
2312 {
2313 int ret;
2314 int idx;
2315
2316 EnterFunction(2);
2317
2318 ret = nf_register_sockopt(&ip_vs_sockopts);
2319 if (ret) {
2320 IP_VS_ERR("cannot register sockopt.\n");
2321 return ret;
2322 }
2323
2324 proc_net_fops_create(&init_net, "ip_vs", 0, &ip_vs_info_fops);
2325 proc_net_fops_create(&init_net, "ip_vs_stats",0, &ip_vs_stats_fops);
2326
2327 sysctl_header = register_sysctl_paths(net_vs_ctl_path, vs_vars);
2328
2329 /* Initialize ip_vs_svc_table, ip_vs_svc_fwm_table, ip_vs_rtable */
2330 for(idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
2331 INIT_LIST_HEAD(&ip_vs_svc_table[idx]);
2332 INIT_LIST_HEAD(&ip_vs_svc_fwm_table[idx]);
2333 }
2334 for(idx = 0; idx < IP_VS_RTAB_SIZE; idx++) {
2335 INIT_LIST_HEAD(&ip_vs_rtable[idx]);
2336 }
2337
2338 memset(&ip_vs_stats, 0, sizeof(ip_vs_stats));
2339 spin_lock_init(&ip_vs_stats.lock);
2340 ip_vs_new_estimator(&ip_vs_stats);
2341
2342 /* Hook the defense timer */
2343 schedule_delayed_work(&defense_work, DEFENSE_TIMER_PERIOD);
2344
2345 LeaveFunction(2);
2346 return 0;
2347 }
2348
2349
2350 void ip_vs_control_cleanup(void)
2351 {
2352 EnterFunction(2);
2353 ip_vs_trash_cleanup();
2354 cancel_rearming_delayed_work(&defense_work);
2355 cancel_work_sync(&defense_work.work);
2356 ip_vs_kill_estimator(&ip_vs_stats);
2357 unregister_sysctl_table(sysctl_header);
2358 proc_net_remove(&init_net, "ip_vs_stats");
2359 proc_net_remove(&init_net, "ip_vs");
2360 nf_unregister_sockopt(&ip_vs_sockopts);
2361 LeaveFunction(2);
2362 }
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