IPVS: Allow null argument to ip_vs_scheduler_put()
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / net / netfilter / ipvs / ip_vs_ctl.c
1 /*
2 * IPVS An implementation of the IP virtual server support for the
3 * LINUX operating system. IPVS is now implemented as a module
4 * over the NetFilter framework. IPVS can be used to build a
5 * high-performance and highly available server based on a
6 * cluster of servers.
7 *
8 * Authors: Wensong Zhang <wensong@linuxvirtualserver.org>
9 * Peter Kese <peter.kese@ijs.si>
10 * Julian Anastasov <ja@ssi.bg>
11 *
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * as published by the Free Software Foundation; either version
15 * 2 of the License, or (at your option) any later version.
16 *
17 * Changes:
18 *
19 */
20
21 #define KMSG_COMPONENT "IPVS"
22 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
23
24 #include <linux/module.h>
25 #include <linux/init.h>
26 #include <linux/types.h>
27 #include <linux/capability.h>
28 #include <linux/fs.h>
29 #include <linux/sysctl.h>
30 #include <linux/proc_fs.h>
31 #include <linux/workqueue.h>
32 #include <linux/swap.h>
33 #include <linux/seq_file.h>
34 #include <linux/slab.h>
35
36 #include <linux/netfilter.h>
37 #include <linux/netfilter_ipv4.h>
38 #include <linux/mutex.h>
39
40 #include <net/net_namespace.h>
41 #include <net/ip.h>
42 #ifdef CONFIG_IP_VS_IPV6
43 #include <net/ipv6.h>
44 #include <net/ip6_route.h>
45 #endif
46 #include <net/route.h>
47 #include <net/sock.h>
48 #include <net/genetlink.h>
49
50 #include <asm/uaccess.h>
51
52 #include <net/ip_vs.h>
53
54 /* semaphore for IPVS sockopts. And, [gs]etsockopt may sleep. */
55 static DEFINE_MUTEX(__ip_vs_mutex);
56
57 /* lock for service table */
58 static DEFINE_RWLOCK(__ip_vs_svc_lock);
59
60 /* lock for table with the real services */
61 static DEFINE_RWLOCK(__ip_vs_rs_lock);
62
63 /* lock for state and timeout tables */
64 static DEFINE_SPINLOCK(ip_vs_securetcp_lock);
65
66 /* lock for drop entry handling */
67 static DEFINE_SPINLOCK(__ip_vs_dropentry_lock);
68
69 /* lock for drop packet handling */
70 static DEFINE_SPINLOCK(__ip_vs_droppacket_lock);
71
72 /* 1/rate drop and drop-entry variables */
73 int ip_vs_drop_rate = 0;
74 int ip_vs_drop_counter = 0;
75 static atomic_t ip_vs_dropentry = ATOMIC_INIT(0);
76
77 /* number of virtual services */
78 static int ip_vs_num_services = 0;
79
80 /* sysctl variables */
81 static int sysctl_ip_vs_drop_entry = 0;
82 static int sysctl_ip_vs_drop_packet = 0;
83 static int sysctl_ip_vs_secure_tcp = 0;
84 static int sysctl_ip_vs_amemthresh = 1024;
85 static int sysctl_ip_vs_am_droprate = 10;
86 int sysctl_ip_vs_cache_bypass = 0;
87 int sysctl_ip_vs_expire_nodest_conn = 0;
88 int sysctl_ip_vs_expire_quiescent_template = 0;
89 int sysctl_ip_vs_sync_threshold[2] = { 3, 50 };
90 int sysctl_ip_vs_nat_icmp_send = 0;
91 #ifdef CONFIG_IP_VS_NFCT
92 int sysctl_ip_vs_conntrack;
93 #endif
94 int sysctl_ip_vs_snat_reroute = 1;
95
96
97 #ifdef CONFIG_IP_VS_DEBUG
98 static int sysctl_ip_vs_debug_level = 0;
99
100 int ip_vs_get_debug_level(void)
101 {
102 return sysctl_ip_vs_debug_level;
103 }
104 #endif
105
106 #ifdef CONFIG_IP_VS_IPV6
107 /* Taken from rt6_fill_node() in net/ipv6/route.c, is there a better way? */
108 static int __ip_vs_addr_is_local_v6(const struct in6_addr *addr)
109 {
110 struct rt6_info *rt;
111 struct flowi fl = {
112 .oif = 0,
113 .nl_u = {
114 .ip6_u = {
115 .daddr = *addr,
116 .saddr = { .s6_addr32 = {0, 0, 0, 0} }, } },
117 };
118
119 rt = (struct rt6_info *)ip6_route_output(&init_net, NULL, &fl);
120 if (rt && rt->rt6i_dev && (rt->rt6i_dev->flags & IFF_LOOPBACK))
121 return 1;
122
123 return 0;
124 }
125 #endif
126 /*
127 * update_defense_level is called from keventd and from sysctl,
128 * so it needs to protect itself from softirqs
129 */
130 static void update_defense_level(void)
131 {
132 struct sysinfo i;
133 static int old_secure_tcp = 0;
134 int availmem;
135 int nomem;
136 int to_change = -1;
137
138 /* we only count free and buffered memory (in pages) */
139 si_meminfo(&i);
140 availmem = i.freeram + i.bufferram;
141 /* however in linux 2.5 the i.bufferram is total page cache size,
142 we need adjust it */
143 /* si_swapinfo(&i); */
144 /* availmem = availmem - (i.totalswap - i.freeswap); */
145
146 nomem = (availmem < sysctl_ip_vs_amemthresh);
147
148 local_bh_disable();
149
150 /* drop_entry */
151 spin_lock(&__ip_vs_dropentry_lock);
152 switch (sysctl_ip_vs_drop_entry) {
153 case 0:
154 atomic_set(&ip_vs_dropentry, 0);
155 break;
156 case 1:
157 if (nomem) {
158 atomic_set(&ip_vs_dropentry, 1);
159 sysctl_ip_vs_drop_entry = 2;
160 } else {
161 atomic_set(&ip_vs_dropentry, 0);
162 }
163 break;
164 case 2:
165 if (nomem) {
166 atomic_set(&ip_vs_dropentry, 1);
167 } else {
168 atomic_set(&ip_vs_dropentry, 0);
169 sysctl_ip_vs_drop_entry = 1;
170 };
171 break;
172 case 3:
173 atomic_set(&ip_vs_dropentry, 1);
174 break;
175 }
176 spin_unlock(&__ip_vs_dropentry_lock);
177
178 /* drop_packet */
179 spin_lock(&__ip_vs_droppacket_lock);
180 switch (sysctl_ip_vs_drop_packet) {
181 case 0:
182 ip_vs_drop_rate = 0;
183 break;
184 case 1:
185 if (nomem) {
186 ip_vs_drop_rate = ip_vs_drop_counter
187 = sysctl_ip_vs_amemthresh /
188 (sysctl_ip_vs_amemthresh-availmem);
189 sysctl_ip_vs_drop_packet = 2;
190 } else {
191 ip_vs_drop_rate = 0;
192 }
193 break;
194 case 2:
195 if (nomem) {
196 ip_vs_drop_rate = ip_vs_drop_counter
197 = sysctl_ip_vs_amemthresh /
198 (sysctl_ip_vs_amemthresh-availmem);
199 } else {
200 ip_vs_drop_rate = 0;
201 sysctl_ip_vs_drop_packet = 1;
202 }
203 break;
204 case 3:
205 ip_vs_drop_rate = sysctl_ip_vs_am_droprate;
206 break;
207 }
208 spin_unlock(&__ip_vs_droppacket_lock);
209
210 /* secure_tcp */
211 spin_lock(&ip_vs_securetcp_lock);
212 switch (sysctl_ip_vs_secure_tcp) {
213 case 0:
214 if (old_secure_tcp >= 2)
215 to_change = 0;
216 break;
217 case 1:
218 if (nomem) {
219 if (old_secure_tcp < 2)
220 to_change = 1;
221 sysctl_ip_vs_secure_tcp = 2;
222 } else {
223 if (old_secure_tcp >= 2)
224 to_change = 0;
225 }
226 break;
227 case 2:
228 if (nomem) {
229 if (old_secure_tcp < 2)
230 to_change = 1;
231 } else {
232 if (old_secure_tcp >= 2)
233 to_change = 0;
234 sysctl_ip_vs_secure_tcp = 1;
235 }
236 break;
237 case 3:
238 if (old_secure_tcp < 2)
239 to_change = 1;
240 break;
241 }
242 old_secure_tcp = sysctl_ip_vs_secure_tcp;
243 if (to_change >= 0)
244 ip_vs_protocol_timeout_change(sysctl_ip_vs_secure_tcp>1);
245 spin_unlock(&ip_vs_securetcp_lock);
246
247 local_bh_enable();
248 }
249
250
251 /*
252 * Timer for checking the defense
253 */
254 #define DEFENSE_TIMER_PERIOD 1*HZ
255 static void defense_work_handler(struct work_struct *work);
256 static DECLARE_DELAYED_WORK(defense_work, defense_work_handler);
257
258 static void defense_work_handler(struct work_struct *work)
259 {
260 update_defense_level();
261 if (atomic_read(&ip_vs_dropentry))
262 ip_vs_random_dropentry();
263
264 schedule_delayed_work(&defense_work, DEFENSE_TIMER_PERIOD);
265 }
266
267 int
268 ip_vs_use_count_inc(void)
269 {
270 return try_module_get(THIS_MODULE);
271 }
272
273 void
274 ip_vs_use_count_dec(void)
275 {
276 module_put(THIS_MODULE);
277 }
278
279
280 /*
281 * Hash table: for virtual service lookups
282 */
283 #define IP_VS_SVC_TAB_BITS 8
284 #define IP_VS_SVC_TAB_SIZE (1 << IP_VS_SVC_TAB_BITS)
285 #define IP_VS_SVC_TAB_MASK (IP_VS_SVC_TAB_SIZE - 1)
286
287 /* the service table hashed by <protocol, addr, port> */
288 static struct list_head ip_vs_svc_table[IP_VS_SVC_TAB_SIZE];
289 /* the service table hashed by fwmark */
290 static struct list_head ip_vs_svc_fwm_table[IP_VS_SVC_TAB_SIZE];
291
292 /*
293 * Hash table: for real service lookups
294 */
295 #define IP_VS_RTAB_BITS 4
296 #define IP_VS_RTAB_SIZE (1 << IP_VS_RTAB_BITS)
297 #define IP_VS_RTAB_MASK (IP_VS_RTAB_SIZE - 1)
298
299 static struct list_head ip_vs_rtable[IP_VS_RTAB_SIZE];
300
301 /*
302 * Trash for destinations
303 */
304 static LIST_HEAD(ip_vs_dest_trash);
305
306 /*
307 * FTP & NULL virtual service counters
308 */
309 static atomic_t ip_vs_ftpsvc_counter = ATOMIC_INIT(0);
310 static atomic_t ip_vs_nullsvc_counter = ATOMIC_INIT(0);
311
312
313 /*
314 * Returns hash value for virtual service
315 */
316 static __inline__ unsigned
317 ip_vs_svc_hashkey(int af, unsigned proto, const union nf_inet_addr *addr,
318 __be16 port)
319 {
320 register unsigned porth = ntohs(port);
321 __be32 addr_fold = addr->ip;
322
323 #ifdef CONFIG_IP_VS_IPV6
324 if (af == AF_INET6)
325 addr_fold = addr->ip6[0]^addr->ip6[1]^
326 addr->ip6[2]^addr->ip6[3];
327 #endif
328
329 return (proto^ntohl(addr_fold)^(porth>>IP_VS_SVC_TAB_BITS)^porth)
330 & IP_VS_SVC_TAB_MASK;
331 }
332
333 /*
334 * Returns hash value of fwmark for virtual service lookup
335 */
336 static __inline__ unsigned ip_vs_svc_fwm_hashkey(__u32 fwmark)
337 {
338 return fwmark & IP_VS_SVC_TAB_MASK;
339 }
340
341 /*
342 * Hashes a service in the ip_vs_svc_table by <proto,addr,port>
343 * or in the ip_vs_svc_fwm_table by fwmark.
344 * Should be called with locked tables.
345 */
346 static int ip_vs_svc_hash(struct ip_vs_service *svc)
347 {
348 unsigned hash;
349
350 if (svc->flags & IP_VS_SVC_F_HASHED) {
351 pr_err("%s(): request for already hashed, called from %pF\n",
352 __func__, __builtin_return_address(0));
353 return 0;
354 }
355
356 if (svc->fwmark == 0) {
357 /*
358 * Hash it by <protocol,addr,port> in ip_vs_svc_table
359 */
360 hash = ip_vs_svc_hashkey(svc->af, svc->protocol, &svc->addr,
361 svc->port);
362 list_add(&svc->s_list, &ip_vs_svc_table[hash]);
363 } else {
364 /*
365 * Hash it by fwmark in ip_vs_svc_fwm_table
366 */
367 hash = ip_vs_svc_fwm_hashkey(svc->fwmark);
368 list_add(&svc->f_list, &ip_vs_svc_fwm_table[hash]);
369 }
370
371 svc->flags |= IP_VS_SVC_F_HASHED;
372 /* increase its refcnt because it is referenced by the svc table */
373 atomic_inc(&svc->refcnt);
374 return 1;
375 }
376
377
378 /*
379 * Unhashes a service from ip_vs_svc_table/ip_vs_svc_fwm_table.
380 * Should be called with locked tables.
381 */
382 static int ip_vs_svc_unhash(struct ip_vs_service *svc)
383 {
384 if (!(svc->flags & IP_VS_SVC_F_HASHED)) {
385 pr_err("%s(): request for unhash flagged, called from %pF\n",
386 __func__, __builtin_return_address(0));
387 return 0;
388 }
389
390 if (svc->fwmark == 0) {
391 /* Remove it from the ip_vs_svc_table table */
392 list_del(&svc->s_list);
393 } else {
394 /* Remove it from the ip_vs_svc_fwm_table table */
395 list_del(&svc->f_list);
396 }
397
398 svc->flags &= ~IP_VS_SVC_F_HASHED;
399 atomic_dec(&svc->refcnt);
400 return 1;
401 }
402
403
404 /*
405 * Get service by {proto,addr,port} in the service table.
406 */
407 static inline struct ip_vs_service *
408 __ip_vs_service_find(int af, __u16 protocol, const union nf_inet_addr *vaddr,
409 __be16 vport)
410 {
411 unsigned hash;
412 struct ip_vs_service *svc;
413
414 /* Check for "full" addressed entries */
415 hash = ip_vs_svc_hashkey(af, protocol, vaddr, vport);
416
417 list_for_each_entry(svc, &ip_vs_svc_table[hash], s_list){
418 if ((svc->af == af)
419 && ip_vs_addr_equal(af, &svc->addr, vaddr)
420 && (svc->port == vport)
421 && (svc->protocol == protocol)) {
422 /* HIT */
423 return svc;
424 }
425 }
426
427 return NULL;
428 }
429
430
431 /*
432 * Get service by {fwmark} in the service table.
433 */
434 static inline struct ip_vs_service *
435 __ip_vs_svc_fwm_find(int af, __u32 fwmark)
436 {
437 unsigned hash;
438 struct ip_vs_service *svc;
439
440 /* Check for fwmark addressed entries */
441 hash = ip_vs_svc_fwm_hashkey(fwmark);
442
443 list_for_each_entry(svc, &ip_vs_svc_fwm_table[hash], f_list) {
444 if (svc->fwmark == fwmark && svc->af == af) {
445 /* HIT */
446 return svc;
447 }
448 }
449
450 return NULL;
451 }
452
453 struct ip_vs_service *
454 ip_vs_service_get(int af, __u32 fwmark, __u16 protocol,
455 const union nf_inet_addr *vaddr, __be16 vport)
456 {
457 struct ip_vs_service *svc;
458
459 read_lock(&__ip_vs_svc_lock);
460
461 /*
462 * Check the table hashed by fwmark first
463 */
464 if (fwmark && (svc = __ip_vs_svc_fwm_find(af, fwmark)))
465 goto out;
466
467 /*
468 * Check the table hashed by <protocol,addr,port>
469 * for "full" addressed entries
470 */
471 svc = __ip_vs_service_find(af, protocol, vaddr, vport);
472
473 if (svc == NULL
474 && protocol == IPPROTO_TCP
475 && atomic_read(&ip_vs_ftpsvc_counter)
476 && (vport == FTPDATA || ntohs(vport) >= PROT_SOCK)) {
477 /*
478 * Check if ftp service entry exists, the packet
479 * might belong to FTP data connections.
480 */
481 svc = __ip_vs_service_find(af, protocol, vaddr, FTPPORT);
482 }
483
484 if (svc == NULL
485 && atomic_read(&ip_vs_nullsvc_counter)) {
486 /*
487 * Check if the catch-all port (port zero) exists
488 */
489 svc = __ip_vs_service_find(af, protocol, vaddr, 0);
490 }
491
492 out:
493 if (svc)
494 atomic_inc(&svc->usecnt);
495 read_unlock(&__ip_vs_svc_lock);
496
497 IP_VS_DBG_BUF(9, "lookup service: fwm %u %s %s:%u %s\n",
498 fwmark, ip_vs_proto_name(protocol),
499 IP_VS_DBG_ADDR(af, vaddr), ntohs(vport),
500 svc ? "hit" : "not hit");
501
502 return svc;
503 }
504
505
506 static inline void
507 __ip_vs_bind_svc(struct ip_vs_dest *dest, struct ip_vs_service *svc)
508 {
509 atomic_inc(&svc->refcnt);
510 dest->svc = svc;
511 }
512
513 static void
514 __ip_vs_unbind_svc(struct ip_vs_dest *dest)
515 {
516 struct ip_vs_service *svc = dest->svc;
517
518 dest->svc = NULL;
519 if (atomic_dec_and_test(&svc->refcnt)) {
520 IP_VS_DBG_BUF(3, "Removing service %u/%s:%u usecnt=%d\n",
521 svc->fwmark,
522 IP_VS_DBG_ADDR(svc->af, &svc->addr),
523 ntohs(svc->port), atomic_read(&svc->usecnt));
524 kfree(svc);
525 }
526 }
527
528
529 /*
530 * Returns hash value for real service
531 */
532 static inline unsigned ip_vs_rs_hashkey(int af,
533 const union nf_inet_addr *addr,
534 __be16 port)
535 {
536 register unsigned porth = ntohs(port);
537 __be32 addr_fold = addr->ip;
538
539 #ifdef CONFIG_IP_VS_IPV6
540 if (af == AF_INET6)
541 addr_fold = addr->ip6[0]^addr->ip6[1]^
542 addr->ip6[2]^addr->ip6[3];
543 #endif
544
545 return (ntohl(addr_fold)^(porth>>IP_VS_RTAB_BITS)^porth)
546 & IP_VS_RTAB_MASK;
547 }
548
549 /*
550 * Hashes ip_vs_dest in ip_vs_rtable by <proto,addr,port>.
551 * should be called with locked tables.
552 */
553 static int ip_vs_rs_hash(struct ip_vs_dest *dest)
554 {
555 unsigned hash;
556
557 if (!list_empty(&dest->d_list)) {
558 return 0;
559 }
560
561 /*
562 * Hash by proto,addr,port,
563 * which are the parameters of the real service.
564 */
565 hash = ip_vs_rs_hashkey(dest->af, &dest->addr, dest->port);
566
567 list_add(&dest->d_list, &ip_vs_rtable[hash]);
568
569 return 1;
570 }
571
572 /*
573 * UNhashes ip_vs_dest from ip_vs_rtable.
574 * should be called with locked tables.
575 */
576 static int ip_vs_rs_unhash(struct ip_vs_dest *dest)
577 {
578 /*
579 * Remove it from the ip_vs_rtable table.
580 */
581 if (!list_empty(&dest->d_list)) {
582 list_del(&dest->d_list);
583 INIT_LIST_HEAD(&dest->d_list);
584 }
585
586 return 1;
587 }
588
589 /*
590 * Lookup real service by <proto,addr,port> in the real service table.
591 */
592 struct ip_vs_dest *
593 ip_vs_lookup_real_service(int af, __u16 protocol,
594 const union nf_inet_addr *daddr,
595 __be16 dport)
596 {
597 unsigned hash;
598 struct ip_vs_dest *dest;
599
600 /*
601 * Check for "full" addressed entries
602 * Return the first found entry
603 */
604 hash = ip_vs_rs_hashkey(af, daddr, dport);
605
606 read_lock(&__ip_vs_rs_lock);
607 list_for_each_entry(dest, &ip_vs_rtable[hash], d_list) {
608 if ((dest->af == af)
609 && ip_vs_addr_equal(af, &dest->addr, daddr)
610 && (dest->port == dport)
611 && ((dest->protocol == protocol) ||
612 dest->vfwmark)) {
613 /* HIT */
614 read_unlock(&__ip_vs_rs_lock);
615 return dest;
616 }
617 }
618 read_unlock(&__ip_vs_rs_lock);
619
620 return NULL;
621 }
622
623 /*
624 * Lookup destination by {addr,port} in the given service
625 */
626 static struct ip_vs_dest *
627 ip_vs_lookup_dest(struct ip_vs_service *svc, const union nf_inet_addr *daddr,
628 __be16 dport)
629 {
630 struct ip_vs_dest *dest;
631
632 /*
633 * Find the destination for the given service
634 */
635 list_for_each_entry(dest, &svc->destinations, n_list) {
636 if ((dest->af == svc->af)
637 && ip_vs_addr_equal(svc->af, &dest->addr, daddr)
638 && (dest->port == dport)) {
639 /* HIT */
640 return dest;
641 }
642 }
643
644 return NULL;
645 }
646
647 /*
648 * Find destination by {daddr,dport,vaddr,protocol}
649 * Cretaed to be used in ip_vs_process_message() in
650 * the backup synchronization daemon. It finds the
651 * destination to be bound to the received connection
652 * on the backup.
653 *
654 * ip_vs_lookup_real_service() looked promissing, but
655 * seems not working as expected.
656 */
657 struct ip_vs_dest *ip_vs_find_dest(int af, const union nf_inet_addr *daddr,
658 __be16 dport,
659 const union nf_inet_addr *vaddr,
660 __be16 vport, __u16 protocol)
661 {
662 struct ip_vs_dest *dest;
663 struct ip_vs_service *svc;
664
665 svc = ip_vs_service_get(af, 0, protocol, vaddr, vport);
666 if (!svc)
667 return NULL;
668 dest = ip_vs_lookup_dest(svc, daddr, dport);
669 if (dest)
670 atomic_inc(&dest->refcnt);
671 ip_vs_service_put(svc);
672 return dest;
673 }
674
675 /*
676 * Lookup dest by {svc,addr,port} in the destination trash.
677 * The destination trash is used to hold the destinations that are removed
678 * from the service table but are still referenced by some conn entries.
679 * The reason to add the destination trash is when the dest is temporary
680 * down (either by administrator or by monitor program), the dest can be
681 * picked back from the trash, the remaining connections to the dest can
682 * continue, and the counting information of the dest is also useful for
683 * scheduling.
684 */
685 static struct ip_vs_dest *
686 ip_vs_trash_get_dest(struct ip_vs_service *svc, const union nf_inet_addr *daddr,
687 __be16 dport)
688 {
689 struct ip_vs_dest *dest, *nxt;
690
691 /*
692 * Find the destination in trash
693 */
694 list_for_each_entry_safe(dest, nxt, &ip_vs_dest_trash, n_list) {
695 IP_VS_DBG_BUF(3, "Destination %u/%s:%u still in trash, "
696 "dest->refcnt=%d\n",
697 dest->vfwmark,
698 IP_VS_DBG_ADDR(svc->af, &dest->addr),
699 ntohs(dest->port),
700 atomic_read(&dest->refcnt));
701 if (dest->af == svc->af &&
702 ip_vs_addr_equal(svc->af, &dest->addr, daddr) &&
703 dest->port == dport &&
704 dest->vfwmark == svc->fwmark &&
705 dest->protocol == svc->protocol &&
706 (svc->fwmark ||
707 (ip_vs_addr_equal(svc->af, &dest->vaddr, &svc->addr) &&
708 dest->vport == svc->port))) {
709 /* HIT */
710 return dest;
711 }
712
713 /*
714 * Try to purge the destination from trash if not referenced
715 */
716 if (atomic_read(&dest->refcnt) == 1) {
717 IP_VS_DBG_BUF(3, "Removing destination %u/%s:%u "
718 "from trash\n",
719 dest->vfwmark,
720 IP_VS_DBG_ADDR(svc->af, &dest->addr),
721 ntohs(dest->port));
722 list_del(&dest->n_list);
723 ip_vs_dst_reset(dest);
724 __ip_vs_unbind_svc(dest);
725 kfree(dest);
726 }
727 }
728
729 return NULL;
730 }
731
732
733 /*
734 * Clean up all the destinations in the trash
735 * Called by the ip_vs_control_cleanup()
736 *
737 * When the ip_vs_control_clearup is activated by ipvs module exit,
738 * the service tables must have been flushed and all the connections
739 * are expired, and the refcnt of each destination in the trash must
740 * be 1, so we simply release them here.
741 */
742 static void ip_vs_trash_cleanup(void)
743 {
744 struct ip_vs_dest *dest, *nxt;
745
746 list_for_each_entry_safe(dest, nxt, &ip_vs_dest_trash, n_list) {
747 list_del(&dest->n_list);
748 ip_vs_dst_reset(dest);
749 __ip_vs_unbind_svc(dest);
750 kfree(dest);
751 }
752 }
753
754
755 static void
756 ip_vs_zero_stats(struct ip_vs_stats *stats)
757 {
758 spin_lock_bh(&stats->lock);
759
760 memset(&stats->ustats, 0, sizeof(stats->ustats));
761 ip_vs_zero_estimator(stats);
762
763 spin_unlock_bh(&stats->lock);
764 }
765
766 /*
767 * Update a destination in the given service
768 */
769 static void
770 __ip_vs_update_dest(struct ip_vs_service *svc, struct ip_vs_dest *dest,
771 struct ip_vs_dest_user_kern *udest, int add)
772 {
773 int conn_flags;
774
775 /* set the weight and the flags */
776 atomic_set(&dest->weight, udest->weight);
777 conn_flags = udest->conn_flags & IP_VS_CONN_F_DEST_MASK;
778 conn_flags |= IP_VS_CONN_F_INACTIVE;
779
780 /* check if local node and update the flags */
781 #ifdef CONFIG_IP_VS_IPV6
782 if (svc->af == AF_INET6) {
783 if (__ip_vs_addr_is_local_v6(&udest->addr.in6)) {
784 conn_flags = (conn_flags & ~IP_VS_CONN_F_FWD_MASK)
785 | IP_VS_CONN_F_LOCALNODE;
786 }
787 } else
788 #endif
789 if (inet_addr_type(&init_net, udest->addr.ip) == RTN_LOCAL) {
790 conn_flags = (conn_flags & ~IP_VS_CONN_F_FWD_MASK)
791 | IP_VS_CONN_F_LOCALNODE;
792 }
793
794 /* set the IP_VS_CONN_F_NOOUTPUT flag if not masquerading/NAT */
795 if ((conn_flags & IP_VS_CONN_F_FWD_MASK) != IP_VS_CONN_F_MASQ) {
796 conn_flags |= IP_VS_CONN_F_NOOUTPUT;
797 } else {
798 /*
799 * Put the real service in ip_vs_rtable if not present.
800 * For now only for NAT!
801 */
802 write_lock_bh(&__ip_vs_rs_lock);
803 ip_vs_rs_hash(dest);
804 write_unlock_bh(&__ip_vs_rs_lock);
805 }
806 atomic_set(&dest->conn_flags, conn_flags);
807
808 /* bind the service */
809 if (!dest->svc) {
810 __ip_vs_bind_svc(dest, svc);
811 } else {
812 if (dest->svc != svc) {
813 __ip_vs_unbind_svc(dest);
814 ip_vs_zero_stats(&dest->stats);
815 __ip_vs_bind_svc(dest, svc);
816 }
817 }
818
819 /* set the dest status flags */
820 dest->flags |= IP_VS_DEST_F_AVAILABLE;
821
822 if (udest->u_threshold == 0 || udest->u_threshold > dest->u_threshold)
823 dest->flags &= ~IP_VS_DEST_F_OVERLOAD;
824 dest->u_threshold = udest->u_threshold;
825 dest->l_threshold = udest->l_threshold;
826
827 if (add)
828 ip_vs_new_estimator(&dest->stats);
829
830 write_lock_bh(&__ip_vs_svc_lock);
831
832 /* Wait until all other svc users go away */
833 IP_VS_WAIT_WHILE(atomic_read(&svc->usecnt) > 0);
834
835 if (add) {
836 list_add(&dest->n_list, &svc->destinations);
837 svc->num_dests++;
838 }
839
840 /* call the update_service, because server weight may be changed */
841 if (svc->scheduler->update_service)
842 svc->scheduler->update_service(svc);
843
844 write_unlock_bh(&__ip_vs_svc_lock);
845 }
846
847
848 /*
849 * Create a destination for the given service
850 */
851 static int
852 ip_vs_new_dest(struct ip_vs_service *svc, struct ip_vs_dest_user_kern *udest,
853 struct ip_vs_dest **dest_p)
854 {
855 struct ip_vs_dest *dest;
856 unsigned atype;
857
858 EnterFunction(2);
859
860 #ifdef CONFIG_IP_VS_IPV6
861 if (svc->af == AF_INET6) {
862 atype = ipv6_addr_type(&udest->addr.in6);
863 if ((!(atype & IPV6_ADDR_UNICAST) ||
864 atype & IPV6_ADDR_LINKLOCAL) &&
865 !__ip_vs_addr_is_local_v6(&udest->addr.in6))
866 return -EINVAL;
867 } else
868 #endif
869 {
870 atype = inet_addr_type(&init_net, udest->addr.ip);
871 if (atype != RTN_LOCAL && atype != RTN_UNICAST)
872 return -EINVAL;
873 }
874
875 dest = kzalloc(sizeof(struct ip_vs_dest), GFP_KERNEL);
876 if (dest == NULL) {
877 pr_err("%s(): no memory.\n", __func__);
878 return -ENOMEM;
879 }
880
881 dest->af = svc->af;
882 dest->protocol = svc->protocol;
883 dest->vaddr = svc->addr;
884 dest->vport = svc->port;
885 dest->vfwmark = svc->fwmark;
886 ip_vs_addr_copy(svc->af, &dest->addr, &udest->addr);
887 dest->port = udest->port;
888
889 atomic_set(&dest->activeconns, 0);
890 atomic_set(&dest->inactconns, 0);
891 atomic_set(&dest->persistconns, 0);
892 atomic_set(&dest->refcnt, 1);
893
894 INIT_LIST_HEAD(&dest->d_list);
895 spin_lock_init(&dest->dst_lock);
896 spin_lock_init(&dest->stats.lock);
897 __ip_vs_update_dest(svc, dest, udest, 1);
898
899 *dest_p = dest;
900
901 LeaveFunction(2);
902 return 0;
903 }
904
905
906 /*
907 * Add a destination into an existing service
908 */
909 static int
910 ip_vs_add_dest(struct ip_vs_service *svc, struct ip_vs_dest_user_kern *udest)
911 {
912 struct ip_vs_dest *dest;
913 union nf_inet_addr daddr;
914 __be16 dport = udest->port;
915 int ret;
916
917 EnterFunction(2);
918
919 if (udest->weight < 0) {
920 pr_err("%s(): server weight less than zero\n", __func__);
921 return -ERANGE;
922 }
923
924 if (udest->l_threshold > udest->u_threshold) {
925 pr_err("%s(): lower threshold is higher than upper threshold\n",
926 __func__);
927 return -ERANGE;
928 }
929
930 ip_vs_addr_copy(svc->af, &daddr, &udest->addr);
931
932 /*
933 * Check if the dest already exists in the list
934 */
935 dest = ip_vs_lookup_dest(svc, &daddr, dport);
936
937 if (dest != NULL) {
938 IP_VS_DBG(1, "%s(): dest already exists\n", __func__);
939 return -EEXIST;
940 }
941
942 /*
943 * Check if the dest already exists in the trash and
944 * is from the same service
945 */
946 dest = ip_vs_trash_get_dest(svc, &daddr, dport);
947
948 if (dest != NULL) {
949 IP_VS_DBG_BUF(3, "Get destination %s:%u from trash, "
950 "dest->refcnt=%d, service %u/%s:%u\n",
951 IP_VS_DBG_ADDR(svc->af, &daddr), ntohs(dport),
952 atomic_read(&dest->refcnt),
953 dest->vfwmark,
954 IP_VS_DBG_ADDR(svc->af, &dest->vaddr),
955 ntohs(dest->vport));
956
957 /*
958 * Get the destination from the trash
959 */
960 list_del(&dest->n_list);
961
962 __ip_vs_update_dest(svc, dest, udest, 1);
963 ret = 0;
964 } else {
965 /*
966 * Allocate and initialize the dest structure
967 */
968 ret = ip_vs_new_dest(svc, udest, &dest);
969 }
970 LeaveFunction(2);
971
972 return ret;
973 }
974
975
976 /*
977 * Edit a destination in the given service
978 */
979 static int
980 ip_vs_edit_dest(struct ip_vs_service *svc, struct ip_vs_dest_user_kern *udest)
981 {
982 struct ip_vs_dest *dest;
983 union nf_inet_addr daddr;
984 __be16 dport = udest->port;
985
986 EnterFunction(2);
987
988 if (udest->weight < 0) {
989 pr_err("%s(): server weight less than zero\n", __func__);
990 return -ERANGE;
991 }
992
993 if (udest->l_threshold > udest->u_threshold) {
994 pr_err("%s(): lower threshold is higher than upper threshold\n",
995 __func__);
996 return -ERANGE;
997 }
998
999 ip_vs_addr_copy(svc->af, &daddr, &udest->addr);
1000
1001 /*
1002 * Lookup the destination list
1003 */
1004 dest = ip_vs_lookup_dest(svc, &daddr, dport);
1005
1006 if (dest == NULL) {
1007 IP_VS_DBG(1, "%s(): dest doesn't exist\n", __func__);
1008 return -ENOENT;
1009 }
1010
1011 __ip_vs_update_dest(svc, dest, udest, 0);
1012 LeaveFunction(2);
1013
1014 return 0;
1015 }
1016
1017
1018 /*
1019 * Delete a destination (must be already unlinked from the service)
1020 */
1021 static void __ip_vs_del_dest(struct ip_vs_dest *dest)
1022 {
1023 ip_vs_kill_estimator(&dest->stats);
1024
1025 /*
1026 * Remove it from the d-linked list with the real services.
1027 */
1028 write_lock_bh(&__ip_vs_rs_lock);
1029 ip_vs_rs_unhash(dest);
1030 write_unlock_bh(&__ip_vs_rs_lock);
1031
1032 /*
1033 * Decrease the refcnt of the dest, and free the dest
1034 * if nobody refers to it (refcnt=0). Otherwise, throw
1035 * the destination into the trash.
1036 */
1037 if (atomic_dec_and_test(&dest->refcnt)) {
1038 IP_VS_DBG_BUF(3, "Removing destination %u/%s:%u\n",
1039 dest->vfwmark,
1040 IP_VS_DBG_ADDR(dest->af, &dest->addr),
1041 ntohs(dest->port));
1042 ip_vs_dst_reset(dest);
1043 /* simply decrease svc->refcnt here, let the caller check
1044 and release the service if nobody refers to it.
1045 Only user context can release destination and service,
1046 and only one user context can update virtual service at a
1047 time, so the operation here is OK */
1048 atomic_dec(&dest->svc->refcnt);
1049 kfree(dest);
1050 } else {
1051 IP_VS_DBG_BUF(3, "Moving dest %s:%u into trash, "
1052 "dest->refcnt=%d\n",
1053 IP_VS_DBG_ADDR(dest->af, &dest->addr),
1054 ntohs(dest->port),
1055 atomic_read(&dest->refcnt));
1056 list_add(&dest->n_list, &ip_vs_dest_trash);
1057 atomic_inc(&dest->refcnt);
1058 }
1059 }
1060
1061
1062 /*
1063 * Unlink a destination from the given service
1064 */
1065 static void __ip_vs_unlink_dest(struct ip_vs_service *svc,
1066 struct ip_vs_dest *dest,
1067 int svcupd)
1068 {
1069 dest->flags &= ~IP_VS_DEST_F_AVAILABLE;
1070
1071 /*
1072 * Remove it from the d-linked destination list.
1073 */
1074 list_del(&dest->n_list);
1075 svc->num_dests--;
1076
1077 /*
1078 * Call the update_service function of its scheduler
1079 */
1080 if (svcupd && svc->scheduler->update_service)
1081 svc->scheduler->update_service(svc);
1082 }
1083
1084
1085 /*
1086 * Delete a destination server in the given service
1087 */
1088 static int
1089 ip_vs_del_dest(struct ip_vs_service *svc, struct ip_vs_dest_user_kern *udest)
1090 {
1091 struct ip_vs_dest *dest;
1092 __be16 dport = udest->port;
1093
1094 EnterFunction(2);
1095
1096 dest = ip_vs_lookup_dest(svc, &udest->addr, dport);
1097
1098 if (dest == NULL) {
1099 IP_VS_DBG(1, "%s(): destination not found!\n", __func__);
1100 return -ENOENT;
1101 }
1102
1103 write_lock_bh(&__ip_vs_svc_lock);
1104
1105 /*
1106 * Wait until all other svc users go away.
1107 */
1108 IP_VS_WAIT_WHILE(atomic_read(&svc->usecnt) > 0);
1109
1110 /*
1111 * Unlink dest from the service
1112 */
1113 __ip_vs_unlink_dest(svc, dest, 1);
1114
1115 write_unlock_bh(&__ip_vs_svc_lock);
1116
1117 /*
1118 * Delete the destination
1119 */
1120 __ip_vs_del_dest(dest);
1121
1122 LeaveFunction(2);
1123
1124 return 0;
1125 }
1126
1127
1128 /*
1129 * Add a service into the service hash table
1130 */
1131 static int
1132 ip_vs_add_service(struct ip_vs_service_user_kern *u,
1133 struct ip_vs_service **svc_p)
1134 {
1135 int ret = 0;
1136 struct ip_vs_scheduler *sched = NULL;
1137 struct ip_vs_service *svc = NULL;
1138
1139 /* increase the module use count */
1140 ip_vs_use_count_inc();
1141
1142 /* Lookup the scheduler by 'u->sched_name' */
1143 sched = ip_vs_scheduler_get(u->sched_name);
1144 if (sched == NULL) {
1145 pr_info("Scheduler module ip_vs_%s not found\n", u->sched_name);
1146 ret = -ENOENT;
1147 goto out_err;
1148 }
1149
1150 #ifdef CONFIG_IP_VS_IPV6
1151 if (u->af == AF_INET6 && (u->netmask < 1 || u->netmask > 128)) {
1152 ret = -EINVAL;
1153 goto out_err;
1154 }
1155 #endif
1156
1157 svc = kzalloc(sizeof(struct ip_vs_service), GFP_KERNEL);
1158 if (svc == NULL) {
1159 IP_VS_DBG(1, "%s(): no memory\n", __func__);
1160 ret = -ENOMEM;
1161 goto out_err;
1162 }
1163
1164 /* I'm the first user of the service */
1165 atomic_set(&svc->usecnt, 0);
1166 atomic_set(&svc->refcnt, 0);
1167
1168 svc->af = u->af;
1169 svc->protocol = u->protocol;
1170 ip_vs_addr_copy(svc->af, &svc->addr, &u->addr);
1171 svc->port = u->port;
1172 svc->fwmark = u->fwmark;
1173 svc->flags = u->flags;
1174 svc->timeout = u->timeout * HZ;
1175 svc->netmask = u->netmask;
1176
1177 INIT_LIST_HEAD(&svc->destinations);
1178 rwlock_init(&svc->sched_lock);
1179 spin_lock_init(&svc->stats.lock);
1180
1181 /* Bind the scheduler */
1182 ret = ip_vs_bind_scheduler(svc, sched);
1183 if (ret)
1184 goto out_err;
1185 sched = NULL;
1186
1187 /* Update the virtual service counters */
1188 if (svc->port == FTPPORT)
1189 atomic_inc(&ip_vs_ftpsvc_counter);
1190 else if (svc->port == 0)
1191 atomic_inc(&ip_vs_nullsvc_counter);
1192
1193 ip_vs_new_estimator(&svc->stats);
1194
1195 /* Count only IPv4 services for old get/setsockopt interface */
1196 if (svc->af == AF_INET)
1197 ip_vs_num_services++;
1198
1199 /* Hash the service into the service table */
1200 write_lock_bh(&__ip_vs_svc_lock);
1201 ip_vs_svc_hash(svc);
1202 write_unlock_bh(&__ip_vs_svc_lock);
1203
1204 *svc_p = svc;
1205 return 0;
1206
1207 out_err:
1208 if (svc != NULL) {
1209 if (svc->scheduler)
1210 ip_vs_unbind_scheduler(svc);
1211 if (svc->inc) {
1212 local_bh_disable();
1213 ip_vs_app_inc_put(svc->inc);
1214 local_bh_enable();
1215 }
1216 kfree(svc);
1217 }
1218 ip_vs_scheduler_put(sched);
1219
1220 /* decrease the module use count */
1221 ip_vs_use_count_dec();
1222
1223 return ret;
1224 }
1225
1226
1227 /*
1228 * Edit a service and bind it with a new scheduler
1229 */
1230 static int
1231 ip_vs_edit_service(struct ip_vs_service *svc, struct ip_vs_service_user_kern *u)
1232 {
1233 struct ip_vs_scheduler *sched, *old_sched;
1234 int ret = 0;
1235
1236 /*
1237 * Lookup the scheduler, by 'u->sched_name'
1238 */
1239 sched = ip_vs_scheduler_get(u->sched_name);
1240 if (sched == NULL) {
1241 pr_info("Scheduler module ip_vs_%s not found\n", u->sched_name);
1242 return -ENOENT;
1243 }
1244 old_sched = sched;
1245
1246 #ifdef CONFIG_IP_VS_IPV6
1247 if (u->af == AF_INET6 && (u->netmask < 1 || u->netmask > 128)) {
1248 ret = -EINVAL;
1249 goto out;
1250 }
1251 #endif
1252
1253 write_lock_bh(&__ip_vs_svc_lock);
1254
1255 /*
1256 * Wait until all other svc users go away.
1257 */
1258 IP_VS_WAIT_WHILE(atomic_read(&svc->usecnt) > 0);
1259
1260 /*
1261 * Set the flags and timeout value
1262 */
1263 svc->flags = u->flags | IP_VS_SVC_F_HASHED;
1264 svc->timeout = u->timeout * HZ;
1265 svc->netmask = u->netmask;
1266
1267 old_sched = svc->scheduler;
1268 if (sched != old_sched) {
1269 /*
1270 * Unbind the old scheduler
1271 */
1272 if ((ret = ip_vs_unbind_scheduler(svc))) {
1273 old_sched = sched;
1274 goto out_unlock;
1275 }
1276
1277 /*
1278 * Bind the new scheduler
1279 */
1280 if ((ret = ip_vs_bind_scheduler(svc, sched))) {
1281 /*
1282 * If ip_vs_bind_scheduler fails, restore the old
1283 * scheduler.
1284 * The main reason of failure is out of memory.
1285 *
1286 * The question is if the old scheduler can be
1287 * restored all the time. TODO: if it cannot be
1288 * restored some time, we must delete the service,
1289 * otherwise the system may crash.
1290 */
1291 ip_vs_bind_scheduler(svc, old_sched);
1292 old_sched = sched;
1293 goto out_unlock;
1294 }
1295 }
1296
1297 out_unlock:
1298 write_unlock_bh(&__ip_vs_svc_lock);
1299 #ifdef CONFIG_IP_VS_IPV6
1300 out:
1301 #endif
1302 ip_vs_scheduler_put(old_sched);
1303 return ret;
1304 }
1305
1306
1307 /*
1308 * Delete a service from the service list
1309 * - The service must be unlinked, unlocked and not referenced!
1310 * - We are called under _bh lock
1311 */
1312 static void __ip_vs_del_service(struct ip_vs_service *svc)
1313 {
1314 struct ip_vs_dest *dest, *nxt;
1315 struct ip_vs_scheduler *old_sched;
1316
1317 /* Count only IPv4 services for old get/setsockopt interface */
1318 if (svc->af == AF_INET)
1319 ip_vs_num_services--;
1320
1321 ip_vs_kill_estimator(&svc->stats);
1322
1323 /* Unbind scheduler */
1324 old_sched = svc->scheduler;
1325 ip_vs_unbind_scheduler(svc);
1326 ip_vs_scheduler_put(old_sched);
1327
1328 /* Unbind app inc */
1329 if (svc->inc) {
1330 ip_vs_app_inc_put(svc->inc);
1331 svc->inc = NULL;
1332 }
1333
1334 /*
1335 * Unlink the whole destination list
1336 */
1337 list_for_each_entry_safe(dest, nxt, &svc->destinations, n_list) {
1338 __ip_vs_unlink_dest(svc, dest, 0);
1339 __ip_vs_del_dest(dest);
1340 }
1341
1342 /*
1343 * Update the virtual service counters
1344 */
1345 if (svc->port == FTPPORT)
1346 atomic_dec(&ip_vs_ftpsvc_counter);
1347 else if (svc->port == 0)
1348 atomic_dec(&ip_vs_nullsvc_counter);
1349
1350 /*
1351 * Free the service if nobody refers to it
1352 */
1353 if (atomic_read(&svc->refcnt) == 0) {
1354 IP_VS_DBG_BUF(3, "Removing service %u/%s:%u usecnt=%d\n",
1355 svc->fwmark,
1356 IP_VS_DBG_ADDR(svc->af, &svc->addr),
1357 ntohs(svc->port), atomic_read(&svc->usecnt));
1358 kfree(svc);
1359 }
1360
1361 /* decrease the module use count */
1362 ip_vs_use_count_dec();
1363 }
1364
1365 /*
1366 * Unlink a service from list and try to delete it if its refcnt reached 0
1367 */
1368 static void ip_vs_unlink_service(struct ip_vs_service *svc)
1369 {
1370 /*
1371 * Unhash it from the service table
1372 */
1373 write_lock_bh(&__ip_vs_svc_lock);
1374
1375 ip_vs_svc_unhash(svc);
1376
1377 /*
1378 * Wait until all the svc users go away.
1379 */
1380 IP_VS_WAIT_WHILE(atomic_read(&svc->usecnt) > 0);
1381
1382 __ip_vs_del_service(svc);
1383
1384 write_unlock_bh(&__ip_vs_svc_lock);
1385 }
1386
1387 /*
1388 * Delete a service from the service list
1389 */
1390 static int ip_vs_del_service(struct ip_vs_service *svc)
1391 {
1392 if (svc == NULL)
1393 return -EEXIST;
1394 ip_vs_unlink_service(svc);
1395
1396 return 0;
1397 }
1398
1399
1400 /*
1401 * Flush all the virtual services
1402 */
1403 static int ip_vs_flush(void)
1404 {
1405 int idx;
1406 struct ip_vs_service *svc, *nxt;
1407
1408 /*
1409 * Flush the service table hashed by <protocol,addr,port>
1410 */
1411 for(idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
1412 list_for_each_entry_safe(svc, nxt, &ip_vs_svc_table[idx], s_list) {
1413 ip_vs_unlink_service(svc);
1414 }
1415 }
1416
1417 /*
1418 * Flush the service table hashed by fwmark
1419 */
1420 for(idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
1421 list_for_each_entry_safe(svc, nxt,
1422 &ip_vs_svc_fwm_table[idx], f_list) {
1423 ip_vs_unlink_service(svc);
1424 }
1425 }
1426
1427 return 0;
1428 }
1429
1430
1431 /*
1432 * Zero counters in a service or all services
1433 */
1434 static int ip_vs_zero_service(struct ip_vs_service *svc)
1435 {
1436 struct ip_vs_dest *dest;
1437
1438 write_lock_bh(&__ip_vs_svc_lock);
1439 list_for_each_entry(dest, &svc->destinations, n_list) {
1440 ip_vs_zero_stats(&dest->stats);
1441 }
1442 ip_vs_zero_stats(&svc->stats);
1443 write_unlock_bh(&__ip_vs_svc_lock);
1444 return 0;
1445 }
1446
1447 static int ip_vs_zero_all(void)
1448 {
1449 int idx;
1450 struct ip_vs_service *svc;
1451
1452 for(idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
1453 list_for_each_entry(svc, &ip_vs_svc_table[idx], s_list) {
1454 ip_vs_zero_service(svc);
1455 }
1456 }
1457
1458 for(idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
1459 list_for_each_entry(svc, &ip_vs_svc_fwm_table[idx], f_list) {
1460 ip_vs_zero_service(svc);
1461 }
1462 }
1463
1464 ip_vs_zero_stats(&ip_vs_stats);
1465 return 0;
1466 }
1467
1468
1469 static int
1470 proc_do_defense_mode(ctl_table *table, int write,
1471 void __user *buffer, size_t *lenp, loff_t *ppos)
1472 {
1473 int *valp = table->data;
1474 int val = *valp;
1475 int rc;
1476
1477 rc = proc_dointvec(table, write, buffer, lenp, ppos);
1478 if (write && (*valp != val)) {
1479 if ((*valp < 0) || (*valp > 3)) {
1480 /* Restore the correct value */
1481 *valp = val;
1482 } else {
1483 update_defense_level();
1484 }
1485 }
1486 return rc;
1487 }
1488
1489
1490 static int
1491 proc_do_sync_threshold(ctl_table *table, int write,
1492 void __user *buffer, size_t *lenp, loff_t *ppos)
1493 {
1494 int *valp = table->data;
1495 int val[2];
1496 int rc;
1497
1498 /* backup the value first */
1499 memcpy(val, valp, sizeof(val));
1500
1501 rc = proc_dointvec(table, write, buffer, lenp, ppos);
1502 if (write && (valp[0] < 0 || valp[1] < 0 || valp[0] >= valp[1])) {
1503 /* Restore the correct value */
1504 memcpy(valp, val, sizeof(val));
1505 }
1506 return rc;
1507 }
1508
1509
1510 /*
1511 * IPVS sysctl table (under the /proc/sys/net/ipv4/vs/)
1512 */
1513
1514 static struct ctl_table vs_vars[] = {
1515 {
1516 .procname = "amemthresh",
1517 .data = &sysctl_ip_vs_amemthresh,
1518 .maxlen = sizeof(int),
1519 .mode = 0644,
1520 .proc_handler = proc_dointvec,
1521 },
1522 #ifdef CONFIG_IP_VS_DEBUG
1523 {
1524 .procname = "debug_level",
1525 .data = &sysctl_ip_vs_debug_level,
1526 .maxlen = sizeof(int),
1527 .mode = 0644,
1528 .proc_handler = proc_dointvec,
1529 },
1530 #endif
1531 {
1532 .procname = "am_droprate",
1533 .data = &sysctl_ip_vs_am_droprate,
1534 .maxlen = sizeof(int),
1535 .mode = 0644,
1536 .proc_handler = proc_dointvec,
1537 },
1538 {
1539 .procname = "drop_entry",
1540 .data = &sysctl_ip_vs_drop_entry,
1541 .maxlen = sizeof(int),
1542 .mode = 0644,
1543 .proc_handler = proc_do_defense_mode,
1544 },
1545 {
1546 .procname = "drop_packet",
1547 .data = &sysctl_ip_vs_drop_packet,
1548 .maxlen = sizeof(int),
1549 .mode = 0644,
1550 .proc_handler = proc_do_defense_mode,
1551 },
1552 #ifdef CONFIG_IP_VS_NFCT
1553 {
1554 .procname = "conntrack",
1555 .data = &sysctl_ip_vs_conntrack,
1556 .maxlen = sizeof(int),
1557 .mode = 0644,
1558 .proc_handler = &proc_dointvec,
1559 },
1560 #endif
1561 {
1562 .procname = "secure_tcp",
1563 .data = &sysctl_ip_vs_secure_tcp,
1564 .maxlen = sizeof(int),
1565 .mode = 0644,
1566 .proc_handler = proc_do_defense_mode,
1567 },
1568 {
1569 .procname = "snat_reroute",
1570 .data = &sysctl_ip_vs_snat_reroute,
1571 .maxlen = sizeof(int),
1572 .mode = 0644,
1573 .proc_handler = &proc_dointvec,
1574 },
1575 #if 0
1576 {
1577 .procname = "timeout_established",
1578 .data = &vs_timeout_table_dos.timeout[IP_VS_S_ESTABLISHED],
1579 .maxlen = sizeof(int),
1580 .mode = 0644,
1581 .proc_handler = proc_dointvec_jiffies,
1582 },
1583 {
1584 .procname = "timeout_synsent",
1585 .data = &vs_timeout_table_dos.timeout[IP_VS_S_SYN_SENT],
1586 .maxlen = sizeof(int),
1587 .mode = 0644,
1588 .proc_handler = proc_dointvec_jiffies,
1589 },
1590 {
1591 .procname = "timeout_synrecv",
1592 .data = &vs_timeout_table_dos.timeout[IP_VS_S_SYN_RECV],
1593 .maxlen = sizeof(int),
1594 .mode = 0644,
1595 .proc_handler = proc_dointvec_jiffies,
1596 },
1597 {
1598 .procname = "timeout_finwait",
1599 .data = &vs_timeout_table_dos.timeout[IP_VS_S_FIN_WAIT],
1600 .maxlen = sizeof(int),
1601 .mode = 0644,
1602 .proc_handler = proc_dointvec_jiffies,
1603 },
1604 {
1605 .procname = "timeout_timewait",
1606 .data = &vs_timeout_table_dos.timeout[IP_VS_S_TIME_WAIT],
1607 .maxlen = sizeof(int),
1608 .mode = 0644,
1609 .proc_handler = proc_dointvec_jiffies,
1610 },
1611 {
1612 .procname = "timeout_close",
1613 .data = &vs_timeout_table_dos.timeout[IP_VS_S_CLOSE],
1614 .maxlen = sizeof(int),
1615 .mode = 0644,
1616 .proc_handler = proc_dointvec_jiffies,
1617 },
1618 {
1619 .procname = "timeout_closewait",
1620 .data = &vs_timeout_table_dos.timeout[IP_VS_S_CLOSE_WAIT],
1621 .maxlen = sizeof(int),
1622 .mode = 0644,
1623 .proc_handler = proc_dointvec_jiffies,
1624 },
1625 {
1626 .procname = "timeout_lastack",
1627 .data = &vs_timeout_table_dos.timeout[IP_VS_S_LAST_ACK],
1628 .maxlen = sizeof(int),
1629 .mode = 0644,
1630 .proc_handler = proc_dointvec_jiffies,
1631 },
1632 {
1633 .procname = "timeout_listen",
1634 .data = &vs_timeout_table_dos.timeout[IP_VS_S_LISTEN],
1635 .maxlen = sizeof(int),
1636 .mode = 0644,
1637 .proc_handler = proc_dointvec_jiffies,
1638 },
1639 {
1640 .procname = "timeout_synack",
1641 .data = &vs_timeout_table_dos.timeout[IP_VS_S_SYNACK],
1642 .maxlen = sizeof(int),
1643 .mode = 0644,
1644 .proc_handler = proc_dointvec_jiffies,
1645 },
1646 {
1647 .procname = "timeout_udp",
1648 .data = &vs_timeout_table_dos.timeout[IP_VS_S_UDP],
1649 .maxlen = sizeof(int),
1650 .mode = 0644,
1651 .proc_handler = proc_dointvec_jiffies,
1652 },
1653 {
1654 .procname = "timeout_icmp",
1655 .data = &vs_timeout_table_dos.timeout[IP_VS_S_ICMP],
1656 .maxlen = sizeof(int),
1657 .mode = 0644,
1658 .proc_handler = proc_dointvec_jiffies,
1659 },
1660 #endif
1661 {
1662 .procname = "cache_bypass",
1663 .data = &sysctl_ip_vs_cache_bypass,
1664 .maxlen = sizeof(int),
1665 .mode = 0644,
1666 .proc_handler = proc_dointvec,
1667 },
1668 {
1669 .procname = "expire_nodest_conn",
1670 .data = &sysctl_ip_vs_expire_nodest_conn,
1671 .maxlen = sizeof(int),
1672 .mode = 0644,
1673 .proc_handler = proc_dointvec,
1674 },
1675 {
1676 .procname = "expire_quiescent_template",
1677 .data = &sysctl_ip_vs_expire_quiescent_template,
1678 .maxlen = sizeof(int),
1679 .mode = 0644,
1680 .proc_handler = proc_dointvec,
1681 },
1682 {
1683 .procname = "sync_threshold",
1684 .data = &sysctl_ip_vs_sync_threshold,
1685 .maxlen = sizeof(sysctl_ip_vs_sync_threshold),
1686 .mode = 0644,
1687 .proc_handler = proc_do_sync_threshold,
1688 },
1689 {
1690 .procname = "nat_icmp_send",
1691 .data = &sysctl_ip_vs_nat_icmp_send,
1692 .maxlen = sizeof(int),
1693 .mode = 0644,
1694 .proc_handler = proc_dointvec,
1695 },
1696 { }
1697 };
1698
1699 const struct ctl_path net_vs_ctl_path[] = {
1700 { .procname = "net", },
1701 { .procname = "ipv4", },
1702 { .procname = "vs", },
1703 { }
1704 };
1705 EXPORT_SYMBOL_GPL(net_vs_ctl_path);
1706
1707 static struct ctl_table_header * sysctl_header;
1708
1709 #ifdef CONFIG_PROC_FS
1710
1711 struct ip_vs_iter {
1712 struct list_head *table;
1713 int bucket;
1714 };
1715
1716 /*
1717 * Write the contents of the VS rule table to a PROCfs file.
1718 * (It is kept just for backward compatibility)
1719 */
1720 static inline const char *ip_vs_fwd_name(unsigned flags)
1721 {
1722 switch (flags & IP_VS_CONN_F_FWD_MASK) {
1723 case IP_VS_CONN_F_LOCALNODE:
1724 return "Local";
1725 case IP_VS_CONN_F_TUNNEL:
1726 return "Tunnel";
1727 case IP_VS_CONN_F_DROUTE:
1728 return "Route";
1729 default:
1730 return "Masq";
1731 }
1732 }
1733
1734
1735 /* Get the Nth entry in the two lists */
1736 static struct ip_vs_service *ip_vs_info_array(struct seq_file *seq, loff_t pos)
1737 {
1738 struct ip_vs_iter *iter = seq->private;
1739 int idx;
1740 struct ip_vs_service *svc;
1741
1742 /* look in hash by protocol */
1743 for (idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
1744 list_for_each_entry(svc, &ip_vs_svc_table[idx], s_list) {
1745 if (pos-- == 0){
1746 iter->table = ip_vs_svc_table;
1747 iter->bucket = idx;
1748 return svc;
1749 }
1750 }
1751 }
1752
1753 /* keep looking in fwmark */
1754 for (idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
1755 list_for_each_entry(svc, &ip_vs_svc_fwm_table[idx], f_list) {
1756 if (pos-- == 0) {
1757 iter->table = ip_vs_svc_fwm_table;
1758 iter->bucket = idx;
1759 return svc;
1760 }
1761 }
1762 }
1763
1764 return NULL;
1765 }
1766
1767 static void *ip_vs_info_seq_start(struct seq_file *seq, loff_t *pos)
1768 __acquires(__ip_vs_svc_lock)
1769 {
1770
1771 read_lock_bh(&__ip_vs_svc_lock);
1772 return *pos ? ip_vs_info_array(seq, *pos - 1) : SEQ_START_TOKEN;
1773 }
1774
1775
1776 static void *ip_vs_info_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1777 {
1778 struct list_head *e;
1779 struct ip_vs_iter *iter;
1780 struct ip_vs_service *svc;
1781
1782 ++*pos;
1783 if (v == SEQ_START_TOKEN)
1784 return ip_vs_info_array(seq,0);
1785
1786 svc = v;
1787 iter = seq->private;
1788
1789 if (iter->table == ip_vs_svc_table) {
1790 /* next service in table hashed by protocol */
1791 if ((e = svc->s_list.next) != &ip_vs_svc_table[iter->bucket])
1792 return list_entry(e, struct ip_vs_service, s_list);
1793
1794
1795 while (++iter->bucket < IP_VS_SVC_TAB_SIZE) {
1796 list_for_each_entry(svc,&ip_vs_svc_table[iter->bucket],
1797 s_list) {
1798 return svc;
1799 }
1800 }
1801
1802 iter->table = ip_vs_svc_fwm_table;
1803 iter->bucket = -1;
1804 goto scan_fwmark;
1805 }
1806
1807 /* next service in hashed by fwmark */
1808 if ((e = svc->f_list.next) != &ip_vs_svc_fwm_table[iter->bucket])
1809 return list_entry(e, struct ip_vs_service, f_list);
1810
1811 scan_fwmark:
1812 while (++iter->bucket < IP_VS_SVC_TAB_SIZE) {
1813 list_for_each_entry(svc, &ip_vs_svc_fwm_table[iter->bucket],
1814 f_list)
1815 return svc;
1816 }
1817
1818 return NULL;
1819 }
1820
1821 static void ip_vs_info_seq_stop(struct seq_file *seq, void *v)
1822 __releases(__ip_vs_svc_lock)
1823 {
1824 read_unlock_bh(&__ip_vs_svc_lock);
1825 }
1826
1827
1828 static int ip_vs_info_seq_show(struct seq_file *seq, void *v)
1829 {
1830 if (v == SEQ_START_TOKEN) {
1831 seq_printf(seq,
1832 "IP Virtual Server version %d.%d.%d (size=%d)\n",
1833 NVERSION(IP_VS_VERSION_CODE), ip_vs_conn_tab_size);
1834 seq_puts(seq,
1835 "Prot LocalAddress:Port Scheduler Flags\n");
1836 seq_puts(seq,
1837 " -> RemoteAddress:Port Forward Weight ActiveConn InActConn\n");
1838 } else {
1839 const struct ip_vs_service *svc = v;
1840 const struct ip_vs_iter *iter = seq->private;
1841 const struct ip_vs_dest *dest;
1842
1843 if (iter->table == ip_vs_svc_table) {
1844 #ifdef CONFIG_IP_VS_IPV6
1845 if (svc->af == AF_INET6)
1846 seq_printf(seq, "%s [%pI6]:%04X %s ",
1847 ip_vs_proto_name(svc->protocol),
1848 &svc->addr.in6,
1849 ntohs(svc->port),
1850 svc->scheduler->name);
1851 else
1852 #endif
1853 seq_printf(seq, "%s %08X:%04X %s %s ",
1854 ip_vs_proto_name(svc->protocol),
1855 ntohl(svc->addr.ip),
1856 ntohs(svc->port),
1857 svc->scheduler->name,
1858 (svc->flags & IP_VS_SVC_F_ONEPACKET)?"ops ":"");
1859 } else {
1860 seq_printf(seq, "FWM %08X %s %s",
1861 svc->fwmark, svc->scheduler->name,
1862 (svc->flags & IP_VS_SVC_F_ONEPACKET)?"ops ":"");
1863 }
1864
1865 if (svc->flags & IP_VS_SVC_F_PERSISTENT)
1866 seq_printf(seq, "persistent %d %08X\n",
1867 svc->timeout,
1868 ntohl(svc->netmask));
1869 else
1870 seq_putc(seq, '\n');
1871
1872 list_for_each_entry(dest, &svc->destinations, n_list) {
1873 #ifdef CONFIG_IP_VS_IPV6
1874 if (dest->af == AF_INET6)
1875 seq_printf(seq,
1876 " -> [%pI6]:%04X"
1877 " %-7s %-6d %-10d %-10d\n",
1878 &dest->addr.in6,
1879 ntohs(dest->port),
1880 ip_vs_fwd_name(atomic_read(&dest->conn_flags)),
1881 atomic_read(&dest->weight),
1882 atomic_read(&dest->activeconns),
1883 atomic_read(&dest->inactconns));
1884 else
1885 #endif
1886 seq_printf(seq,
1887 " -> %08X:%04X "
1888 "%-7s %-6d %-10d %-10d\n",
1889 ntohl(dest->addr.ip),
1890 ntohs(dest->port),
1891 ip_vs_fwd_name(atomic_read(&dest->conn_flags)),
1892 atomic_read(&dest->weight),
1893 atomic_read(&dest->activeconns),
1894 atomic_read(&dest->inactconns));
1895
1896 }
1897 }
1898 return 0;
1899 }
1900
1901 static const struct seq_operations ip_vs_info_seq_ops = {
1902 .start = ip_vs_info_seq_start,
1903 .next = ip_vs_info_seq_next,
1904 .stop = ip_vs_info_seq_stop,
1905 .show = ip_vs_info_seq_show,
1906 };
1907
1908 static int ip_vs_info_open(struct inode *inode, struct file *file)
1909 {
1910 return seq_open_private(file, &ip_vs_info_seq_ops,
1911 sizeof(struct ip_vs_iter));
1912 }
1913
1914 static const struct file_operations ip_vs_info_fops = {
1915 .owner = THIS_MODULE,
1916 .open = ip_vs_info_open,
1917 .read = seq_read,
1918 .llseek = seq_lseek,
1919 .release = seq_release_private,
1920 };
1921
1922 #endif
1923
1924 struct ip_vs_stats ip_vs_stats = {
1925 .lock = __SPIN_LOCK_UNLOCKED(ip_vs_stats.lock),
1926 };
1927
1928 #ifdef CONFIG_PROC_FS
1929 static int ip_vs_stats_show(struct seq_file *seq, void *v)
1930 {
1931
1932 /* 01234567 01234567 01234567 0123456701234567 0123456701234567 */
1933 seq_puts(seq,
1934 " Total Incoming Outgoing Incoming Outgoing\n");
1935 seq_printf(seq,
1936 " Conns Packets Packets Bytes Bytes\n");
1937
1938 spin_lock_bh(&ip_vs_stats.lock);
1939 seq_printf(seq, "%8X %8X %8X %16LX %16LX\n\n", ip_vs_stats.ustats.conns,
1940 ip_vs_stats.ustats.inpkts, ip_vs_stats.ustats.outpkts,
1941 (unsigned long long) ip_vs_stats.ustats.inbytes,
1942 (unsigned long long) ip_vs_stats.ustats.outbytes);
1943
1944 /* 01234567 01234567 01234567 0123456701234567 0123456701234567 */
1945 seq_puts(seq,
1946 " Conns/s Pkts/s Pkts/s Bytes/s Bytes/s\n");
1947 seq_printf(seq,"%8X %8X %8X %16X %16X\n",
1948 ip_vs_stats.ustats.cps,
1949 ip_vs_stats.ustats.inpps,
1950 ip_vs_stats.ustats.outpps,
1951 ip_vs_stats.ustats.inbps,
1952 ip_vs_stats.ustats.outbps);
1953 spin_unlock_bh(&ip_vs_stats.lock);
1954
1955 return 0;
1956 }
1957
1958 static int ip_vs_stats_seq_open(struct inode *inode, struct file *file)
1959 {
1960 return single_open(file, ip_vs_stats_show, NULL);
1961 }
1962
1963 static const struct file_operations ip_vs_stats_fops = {
1964 .owner = THIS_MODULE,
1965 .open = ip_vs_stats_seq_open,
1966 .read = seq_read,
1967 .llseek = seq_lseek,
1968 .release = single_release,
1969 };
1970
1971 #endif
1972
1973 /*
1974 * Set timeout values for tcp tcpfin udp in the timeout_table.
1975 */
1976 static int ip_vs_set_timeout(struct ip_vs_timeout_user *u)
1977 {
1978 IP_VS_DBG(2, "Setting timeout tcp:%d tcpfin:%d udp:%d\n",
1979 u->tcp_timeout,
1980 u->tcp_fin_timeout,
1981 u->udp_timeout);
1982
1983 #ifdef CONFIG_IP_VS_PROTO_TCP
1984 if (u->tcp_timeout) {
1985 ip_vs_protocol_tcp.timeout_table[IP_VS_TCP_S_ESTABLISHED]
1986 = u->tcp_timeout * HZ;
1987 }
1988
1989 if (u->tcp_fin_timeout) {
1990 ip_vs_protocol_tcp.timeout_table[IP_VS_TCP_S_FIN_WAIT]
1991 = u->tcp_fin_timeout * HZ;
1992 }
1993 #endif
1994
1995 #ifdef CONFIG_IP_VS_PROTO_UDP
1996 if (u->udp_timeout) {
1997 ip_vs_protocol_udp.timeout_table[IP_VS_UDP_S_NORMAL]
1998 = u->udp_timeout * HZ;
1999 }
2000 #endif
2001 return 0;
2002 }
2003
2004
2005 #define SET_CMDID(cmd) (cmd - IP_VS_BASE_CTL)
2006 #define SERVICE_ARG_LEN (sizeof(struct ip_vs_service_user))
2007 #define SVCDEST_ARG_LEN (sizeof(struct ip_vs_service_user) + \
2008 sizeof(struct ip_vs_dest_user))
2009 #define TIMEOUT_ARG_LEN (sizeof(struct ip_vs_timeout_user))
2010 #define DAEMON_ARG_LEN (sizeof(struct ip_vs_daemon_user))
2011 #define MAX_ARG_LEN SVCDEST_ARG_LEN
2012
2013 static const unsigned char set_arglen[SET_CMDID(IP_VS_SO_SET_MAX)+1] = {
2014 [SET_CMDID(IP_VS_SO_SET_ADD)] = SERVICE_ARG_LEN,
2015 [SET_CMDID(IP_VS_SO_SET_EDIT)] = SERVICE_ARG_LEN,
2016 [SET_CMDID(IP_VS_SO_SET_DEL)] = SERVICE_ARG_LEN,
2017 [SET_CMDID(IP_VS_SO_SET_FLUSH)] = 0,
2018 [SET_CMDID(IP_VS_SO_SET_ADDDEST)] = SVCDEST_ARG_LEN,
2019 [SET_CMDID(IP_VS_SO_SET_DELDEST)] = SVCDEST_ARG_LEN,
2020 [SET_CMDID(IP_VS_SO_SET_EDITDEST)] = SVCDEST_ARG_LEN,
2021 [SET_CMDID(IP_VS_SO_SET_TIMEOUT)] = TIMEOUT_ARG_LEN,
2022 [SET_CMDID(IP_VS_SO_SET_STARTDAEMON)] = DAEMON_ARG_LEN,
2023 [SET_CMDID(IP_VS_SO_SET_STOPDAEMON)] = DAEMON_ARG_LEN,
2024 [SET_CMDID(IP_VS_SO_SET_ZERO)] = SERVICE_ARG_LEN,
2025 };
2026
2027 static void ip_vs_copy_usvc_compat(struct ip_vs_service_user_kern *usvc,
2028 struct ip_vs_service_user *usvc_compat)
2029 {
2030 usvc->af = AF_INET;
2031 usvc->protocol = usvc_compat->protocol;
2032 usvc->addr.ip = usvc_compat->addr;
2033 usvc->port = usvc_compat->port;
2034 usvc->fwmark = usvc_compat->fwmark;
2035
2036 /* Deep copy of sched_name is not needed here */
2037 usvc->sched_name = usvc_compat->sched_name;
2038
2039 usvc->flags = usvc_compat->flags;
2040 usvc->timeout = usvc_compat->timeout;
2041 usvc->netmask = usvc_compat->netmask;
2042 }
2043
2044 static void ip_vs_copy_udest_compat(struct ip_vs_dest_user_kern *udest,
2045 struct ip_vs_dest_user *udest_compat)
2046 {
2047 udest->addr.ip = udest_compat->addr;
2048 udest->port = udest_compat->port;
2049 udest->conn_flags = udest_compat->conn_flags;
2050 udest->weight = udest_compat->weight;
2051 udest->u_threshold = udest_compat->u_threshold;
2052 udest->l_threshold = udest_compat->l_threshold;
2053 }
2054
2055 static int
2056 do_ip_vs_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len)
2057 {
2058 int ret;
2059 unsigned char arg[MAX_ARG_LEN];
2060 struct ip_vs_service_user *usvc_compat;
2061 struct ip_vs_service_user_kern usvc;
2062 struct ip_vs_service *svc;
2063 struct ip_vs_dest_user *udest_compat;
2064 struct ip_vs_dest_user_kern udest;
2065
2066 if (!capable(CAP_NET_ADMIN))
2067 return -EPERM;
2068
2069 if (cmd < IP_VS_BASE_CTL || cmd > IP_VS_SO_SET_MAX)
2070 return -EINVAL;
2071 if (len < 0 || len > MAX_ARG_LEN)
2072 return -EINVAL;
2073 if (len != set_arglen[SET_CMDID(cmd)]) {
2074 pr_err("set_ctl: len %u != %u\n",
2075 len, set_arglen[SET_CMDID(cmd)]);
2076 return -EINVAL;
2077 }
2078
2079 if (copy_from_user(arg, user, len) != 0)
2080 return -EFAULT;
2081
2082 /* increase the module use count */
2083 ip_vs_use_count_inc();
2084
2085 if (mutex_lock_interruptible(&__ip_vs_mutex)) {
2086 ret = -ERESTARTSYS;
2087 goto out_dec;
2088 }
2089
2090 if (cmd == IP_VS_SO_SET_FLUSH) {
2091 /* Flush the virtual service */
2092 ret = ip_vs_flush();
2093 goto out_unlock;
2094 } else if (cmd == IP_VS_SO_SET_TIMEOUT) {
2095 /* Set timeout values for (tcp tcpfin udp) */
2096 ret = ip_vs_set_timeout((struct ip_vs_timeout_user *)arg);
2097 goto out_unlock;
2098 } else if (cmd == IP_VS_SO_SET_STARTDAEMON) {
2099 struct ip_vs_daemon_user *dm = (struct ip_vs_daemon_user *)arg;
2100 ret = start_sync_thread(dm->state, dm->mcast_ifn, dm->syncid);
2101 goto out_unlock;
2102 } else if (cmd == IP_VS_SO_SET_STOPDAEMON) {
2103 struct ip_vs_daemon_user *dm = (struct ip_vs_daemon_user *)arg;
2104 ret = stop_sync_thread(dm->state);
2105 goto out_unlock;
2106 }
2107
2108 usvc_compat = (struct ip_vs_service_user *)arg;
2109 udest_compat = (struct ip_vs_dest_user *)(usvc_compat + 1);
2110
2111 /* We only use the new structs internally, so copy userspace compat
2112 * structs to extended internal versions */
2113 ip_vs_copy_usvc_compat(&usvc, usvc_compat);
2114 ip_vs_copy_udest_compat(&udest, udest_compat);
2115
2116 if (cmd == IP_VS_SO_SET_ZERO) {
2117 /* if no service address is set, zero counters in all */
2118 if (!usvc.fwmark && !usvc.addr.ip && !usvc.port) {
2119 ret = ip_vs_zero_all();
2120 goto out_unlock;
2121 }
2122 }
2123
2124 /* Check for valid protocol: TCP or UDP or SCTP, even for fwmark!=0 */
2125 if (usvc.protocol != IPPROTO_TCP && usvc.protocol != IPPROTO_UDP &&
2126 usvc.protocol != IPPROTO_SCTP) {
2127 pr_err("set_ctl: invalid protocol: %d %pI4:%d %s\n",
2128 usvc.protocol, &usvc.addr.ip,
2129 ntohs(usvc.port), usvc.sched_name);
2130 ret = -EFAULT;
2131 goto out_unlock;
2132 }
2133
2134 /* Lookup the exact service by <protocol, addr, port> or fwmark */
2135 if (usvc.fwmark == 0)
2136 svc = __ip_vs_service_find(usvc.af, usvc.protocol,
2137 &usvc.addr, usvc.port);
2138 else
2139 svc = __ip_vs_svc_fwm_find(usvc.af, usvc.fwmark);
2140
2141 if (cmd != IP_VS_SO_SET_ADD
2142 && (svc == NULL || svc->protocol != usvc.protocol)) {
2143 ret = -ESRCH;
2144 goto out_unlock;
2145 }
2146
2147 switch (cmd) {
2148 case IP_VS_SO_SET_ADD:
2149 if (svc != NULL)
2150 ret = -EEXIST;
2151 else
2152 ret = ip_vs_add_service(&usvc, &svc);
2153 break;
2154 case IP_VS_SO_SET_EDIT:
2155 ret = ip_vs_edit_service(svc, &usvc);
2156 break;
2157 case IP_VS_SO_SET_DEL:
2158 ret = ip_vs_del_service(svc);
2159 if (!ret)
2160 goto out_unlock;
2161 break;
2162 case IP_VS_SO_SET_ZERO:
2163 ret = ip_vs_zero_service(svc);
2164 break;
2165 case IP_VS_SO_SET_ADDDEST:
2166 ret = ip_vs_add_dest(svc, &udest);
2167 break;
2168 case IP_VS_SO_SET_EDITDEST:
2169 ret = ip_vs_edit_dest(svc, &udest);
2170 break;
2171 case IP_VS_SO_SET_DELDEST:
2172 ret = ip_vs_del_dest(svc, &udest);
2173 break;
2174 default:
2175 ret = -EINVAL;
2176 }
2177
2178 out_unlock:
2179 mutex_unlock(&__ip_vs_mutex);
2180 out_dec:
2181 /* decrease the module use count */
2182 ip_vs_use_count_dec();
2183
2184 return ret;
2185 }
2186
2187
2188 static void
2189 ip_vs_copy_stats(struct ip_vs_stats_user *dst, struct ip_vs_stats *src)
2190 {
2191 spin_lock_bh(&src->lock);
2192 memcpy(dst, &src->ustats, sizeof(*dst));
2193 spin_unlock_bh(&src->lock);
2194 }
2195
2196 static void
2197 ip_vs_copy_service(struct ip_vs_service_entry *dst, struct ip_vs_service *src)
2198 {
2199 dst->protocol = src->protocol;
2200 dst->addr = src->addr.ip;
2201 dst->port = src->port;
2202 dst->fwmark = src->fwmark;
2203 strlcpy(dst->sched_name, src->scheduler->name, sizeof(dst->sched_name));
2204 dst->flags = src->flags;
2205 dst->timeout = src->timeout / HZ;
2206 dst->netmask = src->netmask;
2207 dst->num_dests = src->num_dests;
2208 ip_vs_copy_stats(&dst->stats, &src->stats);
2209 }
2210
2211 static inline int
2212 __ip_vs_get_service_entries(const struct ip_vs_get_services *get,
2213 struct ip_vs_get_services __user *uptr)
2214 {
2215 int idx, count=0;
2216 struct ip_vs_service *svc;
2217 struct ip_vs_service_entry entry;
2218 int ret = 0;
2219
2220 for (idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
2221 list_for_each_entry(svc, &ip_vs_svc_table[idx], s_list) {
2222 /* Only expose IPv4 entries to old interface */
2223 if (svc->af != AF_INET)
2224 continue;
2225
2226 if (count >= get->num_services)
2227 goto out;
2228 memset(&entry, 0, sizeof(entry));
2229 ip_vs_copy_service(&entry, svc);
2230 if (copy_to_user(&uptr->entrytable[count],
2231 &entry, sizeof(entry))) {
2232 ret = -EFAULT;
2233 goto out;
2234 }
2235 count++;
2236 }
2237 }
2238
2239 for (idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
2240 list_for_each_entry(svc, &ip_vs_svc_fwm_table[idx], f_list) {
2241 /* Only expose IPv4 entries to old interface */
2242 if (svc->af != AF_INET)
2243 continue;
2244
2245 if (count >= get->num_services)
2246 goto out;
2247 memset(&entry, 0, sizeof(entry));
2248 ip_vs_copy_service(&entry, svc);
2249 if (copy_to_user(&uptr->entrytable[count],
2250 &entry, sizeof(entry))) {
2251 ret = -EFAULT;
2252 goto out;
2253 }
2254 count++;
2255 }
2256 }
2257 out:
2258 return ret;
2259 }
2260
2261 static inline int
2262 __ip_vs_get_dest_entries(const struct ip_vs_get_dests *get,
2263 struct ip_vs_get_dests __user *uptr)
2264 {
2265 struct ip_vs_service *svc;
2266 union nf_inet_addr addr = { .ip = get->addr };
2267 int ret = 0;
2268
2269 if (get->fwmark)
2270 svc = __ip_vs_svc_fwm_find(AF_INET, get->fwmark);
2271 else
2272 svc = __ip_vs_service_find(AF_INET, get->protocol, &addr,
2273 get->port);
2274
2275 if (svc) {
2276 int count = 0;
2277 struct ip_vs_dest *dest;
2278 struct ip_vs_dest_entry entry;
2279
2280 list_for_each_entry(dest, &svc->destinations, n_list) {
2281 if (count >= get->num_dests)
2282 break;
2283
2284 entry.addr = dest->addr.ip;
2285 entry.port = dest->port;
2286 entry.conn_flags = atomic_read(&dest->conn_flags);
2287 entry.weight = atomic_read(&dest->weight);
2288 entry.u_threshold = dest->u_threshold;
2289 entry.l_threshold = dest->l_threshold;
2290 entry.activeconns = atomic_read(&dest->activeconns);
2291 entry.inactconns = atomic_read(&dest->inactconns);
2292 entry.persistconns = atomic_read(&dest->persistconns);
2293 ip_vs_copy_stats(&entry.stats, &dest->stats);
2294 if (copy_to_user(&uptr->entrytable[count],
2295 &entry, sizeof(entry))) {
2296 ret = -EFAULT;
2297 break;
2298 }
2299 count++;
2300 }
2301 } else
2302 ret = -ESRCH;
2303 return ret;
2304 }
2305
2306 static inline void
2307 __ip_vs_get_timeouts(struct ip_vs_timeout_user *u)
2308 {
2309 #ifdef CONFIG_IP_VS_PROTO_TCP
2310 u->tcp_timeout =
2311 ip_vs_protocol_tcp.timeout_table[IP_VS_TCP_S_ESTABLISHED] / HZ;
2312 u->tcp_fin_timeout =
2313 ip_vs_protocol_tcp.timeout_table[IP_VS_TCP_S_FIN_WAIT] / HZ;
2314 #endif
2315 #ifdef CONFIG_IP_VS_PROTO_UDP
2316 u->udp_timeout =
2317 ip_vs_protocol_udp.timeout_table[IP_VS_UDP_S_NORMAL] / HZ;
2318 #endif
2319 }
2320
2321
2322 #define GET_CMDID(cmd) (cmd - IP_VS_BASE_CTL)
2323 #define GET_INFO_ARG_LEN (sizeof(struct ip_vs_getinfo))
2324 #define GET_SERVICES_ARG_LEN (sizeof(struct ip_vs_get_services))
2325 #define GET_SERVICE_ARG_LEN (sizeof(struct ip_vs_service_entry))
2326 #define GET_DESTS_ARG_LEN (sizeof(struct ip_vs_get_dests))
2327 #define GET_TIMEOUT_ARG_LEN (sizeof(struct ip_vs_timeout_user))
2328 #define GET_DAEMON_ARG_LEN (sizeof(struct ip_vs_daemon_user) * 2)
2329
2330 static const unsigned char get_arglen[GET_CMDID(IP_VS_SO_GET_MAX)+1] = {
2331 [GET_CMDID(IP_VS_SO_GET_VERSION)] = 64,
2332 [GET_CMDID(IP_VS_SO_GET_INFO)] = GET_INFO_ARG_LEN,
2333 [GET_CMDID(IP_VS_SO_GET_SERVICES)] = GET_SERVICES_ARG_LEN,
2334 [GET_CMDID(IP_VS_SO_GET_SERVICE)] = GET_SERVICE_ARG_LEN,
2335 [GET_CMDID(IP_VS_SO_GET_DESTS)] = GET_DESTS_ARG_LEN,
2336 [GET_CMDID(IP_VS_SO_GET_TIMEOUT)] = GET_TIMEOUT_ARG_LEN,
2337 [GET_CMDID(IP_VS_SO_GET_DAEMON)] = GET_DAEMON_ARG_LEN,
2338 };
2339
2340 static int
2341 do_ip_vs_get_ctl(struct sock *sk, int cmd, void __user *user, int *len)
2342 {
2343 unsigned char arg[128];
2344 int ret = 0;
2345 unsigned int copylen;
2346
2347 if (!capable(CAP_NET_ADMIN))
2348 return -EPERM;
2349
2350 if (cmd < IP_VS_BASE_CTL || cmd > IP_VS_SO_GET_MAX)
2351 return -EINVAL;
2352
2353 if (*len < get_arglen[GET_CMDID(cmd)]) {
2354 pr_err("get_ctl: len %u < %u\n",
2355 *len, get_arglen[GET_CMDID(cmd)]);
2356 return -EINVAL;
2357 }
2358
2359 copylen = get_arglen[GET_CMDID(cmd)];
2360 if (copylen > 128)
2361 return -EINVAL;
2362
2363 if (copy_from_user(arg, user, copylen) != 0)
2364 return -EFAULT;
2365
2366 if (mutex_lock_interruptible(&__ip_vs_mutex))
2367 return -ERESTARTSYS;
2368
2369 switch (cmd) {
2370 case IP_VS_SO_GET_VERSION:
2371 {
2372 char buf[64];
2373
2374 sprintf(buf, "IP Virtual Server version %d.%d.%d (size=%d)",
2375 NVERSION(IP_VS_VERSION_CODE), ip_vs_conn_tab_size);
2376 if (copy_to_user(user, buf, strlen(buf)+1) != 0) {
2377 ret = -EFAULT;
2378 goto out;
2379 }
2380 *len = strlen(buf)+1;
2381 }
2382 break;
2383
2384 case IP_VS_SO_GET_INFO:
2385 {
2386 struct ip_vs_getinfo info;
2387 info.version = IP_VS_VERSION_CODE;
2388 info.size = ip_vs_conn_tab_size;
2389 info.num_services = ip_vs_num_services;
2390 if (copy_to_user(user, &info, sizeof(info)) != 0)
2391 ret = -EFAULT;
2392 }
2393 break;
2394
2395 case IP_VS_SO_GET_SERVICES:
2396 {
2397 struct ip_vs_get_services *get;
2398 int size;
2399
2400 get = (struct ip_vs_get_services *)arg;
2401 size = sizeof(*get) +
2402 sizeof(struct ip_vs_service_entry) * get->num_services;
2403 if (*len != size) {
2404 pr_err("length: %u != %u\n", *len, size);
2405 ret = -EINVAL;
2406 goto out;
2407 }
2408 ret = __ip_vs_get_service_entries(get, user);
2409 }
2410 break;
2411
2412 case IP_VS_SO_GET_SERVICE:
2413 {
2414 struct ip_vs_service_entry *entry;
2415 struct ip_vs_service *svc;
2416 union nf_inet_addr addr;
2417
2418 entry = (struct ip_vs_service_entry *)arg;
2419 addr.ip = entry->addr;
2420 if (entry->fwmark)
2421 svc = __ip_vs_svc_fwm_find(AF_INET, entry->fwmark);
2422 else
2423 svc = __ip_vs_service_find(AF_INET, entry->protocol,
2424 &addr, entry->port);
2425 if (svc) {
2426 ip_vs_copy_service(entry, svc);
2427 if (copy_to_user(user, entry, sizeof(*entry)) != 0)
2428 ret = -EFAULT;
2429 } else
2430 ret = -ESRCH;
2431 }
2432 break;
2433
2434 case IP_VS_SO_GET_DESTS:
2435 {
2436 struct ip_vs_get_dests *get;
2437 int size;
2438
2439 get = (struct ip_vs_get_dests *)arg;
2440 size = sizeof(*get) +
2441 sizeof(struct ip_vs_dest_entry) * get->num_dests;
2442 if (*len != size) {
2443 pr_err("length: %u != %u\n", *len, size);
2444 ret = -EINVAL;
2445 goto out;
2446 }
2447 ret = __ip_vs_get_dest_entries(get, user);
2448 }
2449 break;
2450
2451 case IP_VS_SO_GET_TIMEOUT:
2452 {
2453 struct ip_vs_timeout_user t;
2454
2455 __ip_vs_get_timeouts(&t);
2456 if (copy_to_user(user, &t, sizeof(t)) != 0)
2457 ret = -EFAULT;
2458 }
2459 break;
2460
2461 case IP_VS_SO_GET_DAEMON:
2462 {
2463 struct ip_vs_daemon_user d[2];
2464
2465 memset(&d, 0, sizeof(d));
2466 if (ip_vs_sync_state & IP_VS_STATE_MASTER) {
2467 d[0].state = IP_VS_STATE_MASTER;
2468 strlcpy(d[0].mcast_ifn, ip_vs_master_mcast_ifn, sizeof(d[0].mcast_ifn));
2469 d[0].syncid = ip_vs_master_syncid;
2470 }
2471 if (ip_vs_sync_state & IP_VS_STATE_BACKUP) {
2472 d[1].state = IP_VS_STATE_BACKUP;
2473 strlcpy(d[1].mcast_ifn, ip_vs_backup_mcast_ifn, sizeof(d[1].mcast_ifn));
2474 d[1].syncid = ip_vs_backup_syncid;
2475 }
2476 if (copy_to_user(user, &d, sizeof(d)) != 0)
2477 ret = -EFAULT;
2478 }
2479 break;
2480
2481 default:
2482 ret = -EINVAL;
2483 }
2484
2485 out:
2486 mutex_unlock(&__ip_vs_mutex);
2487 return ret;
2488 }
2489
2490
2491 static struct nf_sockopt_ops ip_vs_sockopts = {
2492 .pf = PF_INET,
2493 .set_optmin = IP_VS_BASE_CTL,
2494 .set_optmax = IP_VS_SO_SET_MAX+1,
2495 .set = do_ip_vs_set_ctl,
2496 .get_optmin = IP_VS_BASE_CTL,
2497 .get_optmax = IP_VS_SO_GET_MAX+1,
2498 .get = do_ip_vs_get_ctl,
2499 .owner = THIS_MODULE,
2500 };
2501
2502 /*
2503 * Generic Netlink interface
2504 */
2505
2506 /* IPVS genetlink family */
2507 static struct genl_family ip_vs_genl_family = {
2508 .id = GENL_ID_GENERATE,
2509 .hdrsize = 0,
2510 .name = IPVS_GENL_NAME,
2511 .version = IPVS_GENL_VERSION,
2512 .maxattr = IPVS_CMD_MAX,
2513 };
2514
2515 /* Policy used for first-level command attributes */
2516 static const struct nla_policy ip_vs_cmd_policy[IPVS_CMD_ATTR_MAX + 1] = {
2517 [IPVS_CMD_ATTR_SERVICE] = { .type = NLA_NESTED },
2518 [IPVS_CMD_ATTR_DEST] = { .type = NLA_NESTED },
2519 [IPVS_CMD_ATTR_DAEMON] = { .type = NLA_NESTED },
2520 [IPVS_CMD_ATTR_TIMEOUT_TCP] = { .type = NLA_U32 },
2521 [IPVS_CMD_ATTR_TIMEOUT_TCP_FIN] = { .type = NLA_U32 },
2522 [IPVS_CMD_ATTR_TIMEOUT_UDP] = { .type = NLA_U32 },
2523 };
2524
2525 /* Policy used for attributes in nested attribute IPVS_CMD_ATTR_DAEMON */
2526 static const struct nla_policy ip_vs_daemon_policy[IPVS_DAEMON_ATTR_MAX + 1] = {
2527 [IPVS_DAEMON_ATTR_STATE] = { .type = NLA_U32 },
2528 [IPVS_DAEMON_ATTR_MCAST_IFN] = { .type = NLA_NUL_STRING,
2529 .len = IP_VS_IFNAME_MAXLEN },
2530 [IPVS_DAEMON_ATTR_SYNC_ID] = { .type = NLA_U32 },
2531 };
2532
2533 /* Policy used for attributes in nested attribute IPVS_CMD_ATTR_SERVICE */
2534 static const struct nla_policy ip_vs_svc_policy[IPVS_SVC_ATTR_MAX + 1] = {
2535 [IPVS_SVC_ATTR_AF] = { .type = NLA_U16 },
2536 [IPVS_SVC_ATTR_PROTOCOL] = { .type = NLA_U16 },
2537 [IPVS_SVC_ATTR_ADDR] = { .type = NLA_BINARY,
2538 .len = sizeof(union nf_inet_addr) },
2539 [IPVS_SVC_ATTR_PORT] = { .type = NLA_U16 },
2540 [IPVS_SVC_ATTR_FWMARK] = { .type = NLA_U32 },
2541 [IPVS_SVC_ATTR_SCHED_NAME] = { .type = NLA_NUL_STRING,
2542 .len = IP_VS_SCHEDNAME_MAXLEN },
2543 [IPVS_SVC_ATTR_FLAGS] = { .type = NLA_BINARY,
2544 .len = sizeof(struct ip_vs_flags) },
2545 [IPVS_SVC_ATTR_TIMEOUT] = { .type = NLA_U32 },
2546 [IPVS_SVC_ATTR_NETMASK] = { .type = NLA_U32 },
2547 [IPVS_SVC_ATTR_STATS] = { .type = NLA_NESTED },
2548 };
2549
2550 /* Policy used for attributes in nested attribute IPVS_CMD_ATTR_DEST */
2551 static const struct nla_policy ip_vs_dest_policy[IPVS_DEST_ATTR_MAX + 1] = {
2552 [IPVS_DEST_ATTR_ADDR] = { .type = NLA_BINARY,
2553 .len = sizeof(union nf_inet_addr) },
2554 [IPVS_DEST_ATTR_PORT] = { .type = NLA_U16 },
2555 [IPVS_DEST_ATTR_FWD_METHOD] = { .type = NLA_U32 },
2556 [IPVS_DEST_ATTR_WEIGHT] = { .type = NLA_U32 },
2557 [IPVS_DEST_ATTR_U_THRESH] = { .type = NLA_U32 },
2558 [IPVS_DEST_ATTR_L_THRESH] = { .type = NLA_U32 },
2559 [IPVS_DEST_ATTR_ACTIVE_CONNS] = { .type = NLA_U32 },
2560 [IPVS_DEST_ATTR_INACT_CONNS] = { .type = NLA_U32 },
2561 [IPVS_DEST_ATTR_PERSIST_CONNS] = { .type = NLA_U32 },
2562 [IPVS_DEST_ATTR_STATS] = { .type = NLA_NESTED },
2563 };
2564
2565 static int ip_vs_genl_fill_stats(struct sk_buff *skb, int container_type,
2566 struct ip_vs_stats *stats)
2567 {
2568 struct nlattr *nl_stats = nla_nest_start(skb, container_type);
2569 if (!nl_stats)
2570 return -EMSGSIZE;
2571
2572 spin_lock_bh(&stats->lock);
2573
2574 NLA_PUT_U32(skb, IPVS_STATS_ATTR_CONNS, stats->ustats.conns);
2575 NLA_PUT_U32(skb, IPVS_STATS_ATTR_INPKTS, stats->ustats.inpkts);
2576 NLA_PUT_U32(skb, IPVS_STATS_ATTR_OUTPKTS, stats->ustats.outpkts);
2577 NLA_PUT_U64(skb, IPVS_STATS_ATTR_INBYTES, stats->ustats.inbytes);
2578 NLA_PUT_U64(skb, IPVS_STATS_ATTR_OUTBYTES, stats->ustats.outbytes);
2579 NLA_PUT_U32(skb, IPVS_STATS_ATTR_CPS, stats->ustats.cps);
2580 NLA_PUT_U32(skb, IPVS_STATS_ATTR_INPPS, stats->ustats.inpps);
2581 NLA_PUT_U32(skb, IPVS_STATS_ATTR_OUTPPS, stats->ustats.outpps);
2582 NLA_PUT_U32(skb, IPVS_STATS_ATTR_INBPS, stats->ustats.inbps);
2583 NLA_PUT_U32(skb, IPVS_STATS_ATTR_OUTBPS, stats->ustats.outbps);
2584
2585 spin_unlock_bh(&stats->lock);
2586
2587 nla_nest_end(skb, nl_stats);
2588
2589 return 0;
2590
2591 nla_put_failure:
2592 spin_unlock_bh(&stats->lock);
2593 nla_nest_cancel(skb, nl_stats);
2594 return -EMSGSIZE;
2595 }
2596
2597 static int ip_vs_genl_fill_service(struct sk_buff *skb,
2598 struct ip_vs_service *svc)
2599 {
2600 struct nlattr *nl_service;
2601 struct ip_vs_flags flags = { .flags = svc->flags,
2602 .mask = ~0 };
2603
2604 nl_service = nla_nest_start(skb, IPVS_CMD_ATTR_SERVICE);
2605 if (!nl_service)
2606 return -EMSGSIZE;
2607
2608 NLA_PUT_U16(skb, IPVS_SVC_ATTR_AF, svc->af);
2609
2610 if (svc->fwmark) {
2611 NLA_PUT_U32(skb, IPVS_SVC_ATTR_FWMARK, svc->fwmark);
2612 } else {
2613 NLA_PUT_U16(skb, IPVS_SVC_ATTR_PROTOCOL, svc->protocol);
2614 NLA_PUT(skb, IPVS_SVC_ATTR_ADDR, sizeof(svc->addr), &svc->addr);
2615 NLA_PUT_U16(skb, IPVS_SVC_ATTR_PORT, svc->port);
2616 }
2617
2618 NLA_PUT_STRING(skb, IPVS_SVC_ATTR_SCHED_NAME, svc->scheduler->name);
2619 NLA_PUT(skb, IPVS_SVC_ATTR_FLAGS, sizeof(flags), &flags);
2620 NLA_PUT_U32(skb, IPVS_SVC_ATTR_TIMEOUT, svc->timeout / HZ);
2621 NLA_PUT_U32(skb, IPVS_SVC_ATTR_NETMASK, svc->netmask);
2622
2623 if (ip_vs_genl_fill_stats(skb, IPVS_SVC_ATTR_STATS, &svc->stats))
2624 goto nla_put_failure;
2625
2626 nla_nest_end(skb, nl_service);
2627
2628 return 0;
2629
2630 nla_put_failure:
2631 nla_nest_cancel(skb, nl_service);
2632 return -EMSGSIZE;
2633 }
2634
2635 static int ip_vs_genl_dump_service(struct sk_buff *skb,
2636 struct ip_vs_service *svc,
2637 struct netlink_callback *cb)
2638 {
2639 void *hdr;
2640
2641 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).pid, cb->nlh->nlmsg_seq,
2642 &ip_vs_genl_family, NLM_F_MULTI,
2643 IPVS_CMD_NEW_SERVICE);
2644 if (!hdr)
2645 return -EMSGSIZE;
2646
2647 if (ip_vs_genl_fill_service(skb, svc) < 0)
2648 goto nla_put_failure;
2649
2650 return genlmsg_end(skb, hdr);
2651
2652 nla_put_failure:
2653 genlmsg_cancel(skb, hdr);
2654 return -EMSGSIZE;
2655 }
2656
2657 static int ip_vs_genl_dump_services(struct sk_buff *skb,
2658 struct netlink_callback *cb)
2659 {
2660 int idx = 0, i;
2661 int start = cb->args[0];
2662 struct ip_vs_service *svc;
2663
2664 mutex_lock(&__ip_vs_mutex);
2665 for (i = 0; i < IP_VS_SVC_TAB_SIZE; i++) {
2666 list_for_each_entry(svc, &ip_vs_svc_table[i], s_list) {
2667 if (++idx <= start)
2668 continue;
2669 if (ip_vs_genl_dump_service(skb, svc, cb) < 0) {
2670 idx--;
2671 goto nla_put_failure;
2672 }
2673 }
2674 }
2675
2676 for (i = 0; i < IP_VS_SVC_TAB_SIZE; i++) {
2677 list_for_each_entry(svc, &ip_vs_svc_fwm_table[i], f_list) {
2678 if (++idx <= start)
2679 continue;
2680 if (ip_vs_genl_dump_service(skb, svc, cb) < 0) {
2681 idx--;
2682 goto nla_put_failure;
2683 }
2684 }
2685 }
2686
2687 nla_put_failure:
2688 mutex_unlock(&__ip_vs_mutex);
2689 cb->args[0] = idx;
2690
2691 return skb->len;
2692 }
2693
2694 static int ip_vs_genl_parse_service(struct ip_vs_service_user_kern *usvc,
2695 struct nlattr *nla, int full_entry,
2696 struct ip_vs_service **ret_svc)
2697 {
2698 struct nlattr *attrs[IPVS_SVC_ATTR_MAX + 1];
2699 struct nlattr *nla_af, *nla_port, *nla_fwmark, *nla_protocol, *nla_addr;
2700 struct ip_vs_service *svc;
2701
2702 /* Parse mandatory identifying service fields first */
2703 if (nla == NULL ||
2704 nla_parse_nested(attrs, IPVS_SVC_ATTR_MAX, nla, ip_vs_svc_policy))
2705 return -EINVAL;
2706
2707 nla_af = attrs[IPVS_SVC_ATTR_AF];
2708 nla_protocol = attrs[IPVS_SVC_ATTR_PROTOCOL];
2709 nla_addr = attrs[IPVS_SVC_ATTR_ADDR];
2710 nla_port = attrs[IPVS_SVC_ATTR_PORT];
2711 nla_fwmark = attrs[IPVS_SVC_ATTR_FWMARK];
2712
2713 if (!(nla_af && (nla_fwmark || (nla_port && nla_protocol && nla_addr))))
2714 return -EINVAL;
2715
2716 memset(usvc, 0, sizeof(*usvc));
2717
2718 usvc->af = nla_get_u16(nla_af);
2719 #ifdef CONFIG_IP_VS_IPV6
2720 if (usvc->af != AF_INET && usvc->af != AF_INET6)
2721 #else
2722 if (usvc->af != AF_INET)
2723 #endif
2724 return -EAFNOSUPPORT;
2725
2726 if (nla_fwmark) {
2727 usvc->protocol = IPPROTO_TCP;
2728 usvc->fwmark = nla_get_u32(nla_fwmark);
2729 } else {
2730 usvc->protocol = nla_get_u16(nla_protocol);
2731 nla_memcpy(&usvc->addr, nla_addr, sizeof(usvc->addr));
2732 usvc->port = nla_get_u16(nla_port);
2733 usvc->fwmark = 0;
2734 }
2735
2736 if (usvc->fwmark)
2737 svc = __ip_vs_svc_fwm_find(usvc->af, usvc->fwmark);
2738 else
2739 svc = __ip_vs_service_find(usvc->af, usvc->protocol,
2740 &usvc->addr, usvc->port);
2741 *ret_svc = svc;
2742
2743 /* If a full entry was requested, check for the additional fields */
2744 if (full_entry) {
2745 struct nlattr *nla_sched, *nla_flags, *nla_timeout,
2746 *nla_netmask;
2747 struct ip_vs_flags flags;
2748
2749 nla_sched = attrs[IPVS_SVC_ATTR_SCHED_NAME];
2750 nla_flags = attrs[IPVS_SVC_ATTR_FLAGS];
2751 nla_timeout = attrs[IPVS_SVC_ATTR_TIMEOUT];
2752 nla_netmask = attrs[IPVS_SVC_ATTR_NETMASK];
2753
2754 if (!(nla_sched && nla_flags && nla_timeout && nla_netmask))
2755 return -EINVAL;
2756
2757 nla_memcpy(&flags, nla_flags, sizeof(flags));
2758
2759 /* prefill flags from service if it already exists */
2760 if (svc)
2761 usvc->flags = svc->flags;
2762
2763 /* set new flags from userland */
2764 usvc->flags = (usvc->flags & ~flags.mask) |
2765 (flags.flags & flags.mask);
2766 usvc->sched_name = nla_data(nla_sched);
2767 usvc->timeout = nla_get_u32(nla_timeout);
2768 usvc->netmask = nla_get_u32(nla_netmask);
2769 }
2770
2771 return 0;
2772 }
2773
2774 static struct ip_vs_service *ip_vs_genl_find_service(struct nlattr *nla)
2775 {
2776 struct ip_vs_service_user_kern usvc;
2777 struct ip_vs_service *svc;
2778 int ret;
2779
2780 ret = ip_vs_genl_parse_service(&usvc, nla, 0, &svc);
2781 return ret ? ERR_PTR(ret) : svc;
2782 }
2783
2784 static int ip_vs_genl_fill_dest(struct sk_buff *skb, struct ip_vs_dest *dest)
2785 {
2786 struct nlattr *nl_dest;
2787
2788 nl_dest = nla_nest_start(skb, IPVS_CMD_ATTR_DEST);
2789 if (!nl_dest)
2790 return -EMSGSIZE;
2791
2792 NLA_PUT(skb, IPVS_DEST_ATTR_ADDR, sizeof(dest->addr), &dest->addr);
2793 NLA_PUT_U16(skb, IPVS_DEST_ATTR_PORT, dest->port);
2794
2795 NLA_PUT_U32(skb, IPVS_DEST_ATTR_FWD_METHOD,
2796 atomic_read(&dest->conn_flags) & IP_VS_CONN_F_FWD_MASK);
2797 NLA_PUT_U32(skb, IPVS_DEST_ATTR_WEIGHT, atomic_read(&dest->weight));
2798 NLA_PUT_U32(skb, IPVS_DEST_ATTR_U_THRESH, dest->u_threshold);
2799 NLA_PUT_U32(skb, IPVS_DEST_ATTR_L_THRESH, dest->l_threshold);
2800 NLA_PUT_U32(skb, IPVS_DEST_ATTR_ACTIVE_CONNS,
2801 atomic_read(&dest->activeconns));
2802 NLA_PUT_U32(skb, IPVS_DEST_ATTR_INACT_CONNS,
2803 atomic_read(&dest->inactconns));
2804 NLA_PUT_U32(skb, IPVS_DEST_ATTR_PERSIST_CONNS,
2805 atomic_read(&dest->persistconns));
2806
2807 if (ip_vs_genl_fill_stats(skb, IPVS_DEST_ATTR_STATS, &dest->stats))
2808 goto nla_put_failure;
2809
2810 nla_nest_end(skb, nl_dest);
2811
2812 return 0;
2813
2814 nla_put_failure:
2815 nla_nest_cancel(skb, nl_dest);
2816 return -EMSGSIZE;
2817 }
2818
2819 static int ip_vs_genl_dump_dest(struct sk_buff *skb, struct ip_vs_dest *dest,
2820 struct netlink_callback *cb)
2821 {
2822 void *hdr;
2823
2824 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).pid, cb->nlh->nlmsg_seq,
2825 &ip_vs_genl_family, NLM_F_MULTI,
2826 IPVS_CMD_NEW_DEST);
2827 if (!hdr)
2828 return -EMSGSIZE;
2829
2830 if (ip_vs_genl_fill_dest(skb, dest) < 0)
2831 goto nla_put_failure;
2832
2833 return genlmsg_end(skb, hdr);
2834
2835 nla_put_failure:
2836 genlmsg_cancel(skb, hdr);
2837 return -EMSGSIZE;
2838 }
2839
2840 static int ip_vs_genl_dump_dests(struct sk_buff *skb,
2841 struct netlink_callback *cb)
2842 {
2843 int idx = 0;
2844 int start = cb->args[0];
2845 struct ip_vs_service *svc;
2846 struct ip_vs_dest *dest;
2847 struct nlattr *attrs[IPVS_CMD_ATTR_MAX + 1];
2848
2849 mutex_lock(&__ip_vs_mutex);
2850
2851 /* Try to find the service for which to dump destinations */
2852 if (nlmsg_parse(cb->nlh, GENL_HDRLEN, attrs,
2853 IPVS_CMD_ATTR_MAX, ip_vs_cmd_policy))
2854 goto out_err;
2855
2856 svc = ip_vs_genl_find_service(attrs[IPVS_CMD_ATTR_SERVICE]);
2857 if (IS_ERR(svc) || svc == NULL)
2858 goto out_err;
2859
2860 /* Dump the destinations */
2861 list_for_each_entry(dest, &svc->destinations, n_list) {
2862 if (++idx <= start)
2863 continue;
2864 if (ip_vs_genl_dump_dest(skb, dest, cb) < 0) {
2865 idx--;
2866 goto nla_put_failure;
2867 }
2868 }
2869
2870 nla_put_failure:
2871 cb->args[0] = idx;
2872
2873 out_err:
2874 mutex_unlock(&__ip_vs_mutex);
2875
2876 return skb->len;
2877 }
2878
2879 static int ip_vs_genl_parse_dest(struct ip_vs_dest_user_kern *udest,
2880 struct nlattr *nla, int full_entry)
2881 {
2882 struct nlattr *attrs[IPVS_DEST_ATTR_MAX + 1];
2883 struct nlattr *nla_addr, *nla_port;
2884
2885 /* Parse mandatory identifying destination fields first */
2886 if (nla == NULL ||
2887 nla_parse_nested(attrs, IPVS_DEST_ATTR_MAX, nla, ip_vs_dest_policy))
2888 return -EINVAL;
2889
2890 nla_addr = attrs[IPVS_DEST_ATTR_ADDR];
2891 nla_port = attrs[IPVS_DEST_ATTR_PORT];
2892
2893 if (!(nla_addr && nla_port))
2894 return -EINVAL;
2895
2896 memset(udest, 0, sizeof(*udest));
2897
2898 nla_memcpy(&udest->addr, nla_addr, sizeof(udest->addr));
2899 udest->port = nla_get_u16(nla_port);
2900
2901 /* If a full entry was requested, check for the additional fields */
2902 if (full_entry) {
2903 struct nlattr *nla_fwd, *nla_weight, *nla_u_thresh,
2904 *nla_l_thresh;
2905
2906 nla_fwd = attrs[IPVS_DEST_ATTR_FWD_METHOD];
2907 nla_weight = attrs[IPVS_DEST_ATTR_WEIGHT];
2908 nla_u_thresh = attrs[IPVS_DEST_ATTR_U_THRESH];
2909 nla_l_thresh = attrs[IPVS_DEST_ATTR_L_THRESH];
2910
2911 if (!(nla_fwd && nla_weight && nla_u_thresh && nla_l_thresh))
2912 return -EINVAL;
2913
2914 udest->conn_flags = nla_get_u32(nla_fwd)
2915 & IP_VS_CONN_F_FWD_MASK;
2916 udest->weight = nla_get_u32(nla_weight);
2917 udest->u_threshold = nla_get_u32(nla_u_thresh);
2918 udest->l_threshold = nla_get_u32(nla_l_thresh);
2919 }
2920
2921 return 0;
2922 }
2923
2924 static int ip_vs_genl_fill_daemon(struct sk_buff *skb, __be32 state,
2925 const char *mcast_ifn, __be32 syncid)
2926 {
2927 struct nlattr *nl_daemon;
2928
2929 nl_daemon = nla_nest_start(skb, IPVS_CMD_ATTR_DAEMON);
2930 if (!nl_daemon)
2931 return -EMSGSIZE;
2932
2933 NLA_PUT_U32(skb, IPVS_DAEMON_ATTR_STATE, state);
2934 NLA_PUT_STRING(skb, IPVS_DAEMON_ATTR_MCAST_IFN, mcast_ifn);
2935 NLA_PUT_U32(skb, IPVS_DAEMON_ATTR_SYNC_ID, syncid);
2936
2937 nla_nest_end(skb, nl_daemon);
2938
2939 return 0;
2940
2941 nla_put_failure:
2942 nla_nest_cancel(skb, nl_daemon);
2943 return -EMSGSIZE;
2944 }
2945
2946 static int ip_vs_genl_dump_daemon(struct sk_buff *skb, __be32 state,
2947 const char *mcast_ifn, __be32 syncid,
2948 struct netlink_callback *cb)
2949 {
2950 void *hdr;
2951 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).pid, cb->nlh->nlmsg_seq,
2952 &ip_vs_genl_family, NLM_F_MULTI,
2953 IPVS_CMD_NEW_DAEMON);
2954 if (!hdr)
2955 return -EMSGSIZE;
2956
2957 if (ip_vs_genl_fill_daemon(skb, state, mcast_ifn, syncid))
2958 goto nla_put_failure;
2959
2960 return genlmsg_end(skb, hdr);
2961
2962 nla_put_failure:
2963 genlmsg_cancel(skb, hdr);
2964 return -EMSGSIZE;
2965 }
2966
2967 static int ip_vs_genl_dump_daemons(struct sk_buff *skb,
2968 struct netlink_callback *cb)
2969 {
2970 mutex_lock(&__ip_vs_mutex);
2971 if ((ip_vs_sync_state & IP_VS_STATE_MASTER) && !cb->args[0]) {
2972 if (ip_vs_genl_dump_daemon(skb, IP_VS_STATE_MASTER,
2973 ip_vs_master_mcast_ifn,
2974 ip_vs_master_syncid, cb) < 0)
2975 goto nla_put_failure;
2976
2977 cb->args[0] = 1;
2978 }
2979
2980 if ((ip_vs_sync_state & IP_VS_STATE_BACKUP) && !cb->args[1]) {
2981 if (ip_vs_genl_dump_daemon(skb, IP_VS_STATE_BACKUP,
2982 ip_vs_backup_mcast_ifn,
2983 ip_vs_backup_syncid, cb) < 0)
2984 goto nla_put_failure;
2985
2986 cb->args[1] = 1;
2987 }
2988
2989 nla_put_failure:
2990 mutex_unlock(&__ip_vs_mutex);
2991
2992 return skb->len;
2993 }
2994
2995 static int ip_vs_genl_new_daemon(struct nlattr **attrs)
2996 {
2997 if (!(attrs[IPVS_DAEMON_ATTR_STATE] &&
2998 attrs[IPVS_DAEMON_ATTR_MCAST_IFN] &&
2999 attrs[IPVS_DAEMON_ATTR_SYNC_ID]))
3000 return -EINVAL;
3001
3002 return start_sync_thread(nla_get_u32(attrs[IPVS_DAEMON_ATTR_STATE]),
3003 nla_data(attrs[IPVS_DAEMON_ATTR_MCAST_IFN]),
3004 nla_get_u32(attrs[IPVS_DAEMON_ATTR_SYNC_ID]));
3005 }
3006
3007 static int ip_vs_genl_del_daemon(struct nlattr **attrs)
3008 {
3009 if (!attrs[IPVS_DAEMON_ATTR_STATE])
3010 return -EINVAL;
3011
3012 return stop_sync_thread(nla_get_u32(attrs[IPVS_DAEMON_ATTR_STATE]));
3013 }
3014
3015 static int ip_vs_genl_set_config(struct nlattr **attrs)
3016 {
3017 struct ip_vs_timeout_user t;
3018
3019 __ip_vs_get_timeouts(&t);
3020
3021 if (attrs[IPVS_CMD_ATTR_TIMEOUT_TCP])
3022 t.tcp_timeout = nla_get_u32(attrs[IPVS_CMD_ATTR_TIMEOUT_TCP]);
3023
3024 if (attrs[IPVS_CMD_ATTR_TIMEOUT_TCP_FIN])
3025 t.tcp_fin_timeout =
3026 nla_get_u32(attrs[IPVS_CMD_ATTR_TIMEOUT_TCP_FIN]);
3027
3028 if (attrs[IPVS_CMD_ATTR_TIMEOUT_UDP])
3029 t.udp_timeout = nla_get_u32(attrs[IPVS_CMD_ATTR_TIMEOUT_UDP]);
3030
3031 return ip_vs_set_timeout(&t);
3032 }
3033
3034 static int ip_vs_genl_set_cmd(struct sk_buff *skb, struct genl_info *info)
3035 {
3036 struct ip_vs_service *svc = NULL;
3037 struct ip_vs_service_user_kern usvc;
3038 struct ip_vs_dest_user_kern udest;
3039 int ret = 0, cmd;
3040 int need_full_svc = 0, need_full_dest = 0;
3041
3042 cmd = info->genlhdr->cmd;
3043
3044 mutex_lock(&__ip_vs_mutex);
3045
3046 if (cmd == IPVS_CMD_FLUSH) {
3047 ret = ip_vs_flush();
3048 goto out;
3049 } else if (cmd == IPVS_CMD_SET_CONFIG) {
3050 ret = ip_vs_genl_set_config(info->attrs);
3051 goto out;
3052 } else if (cmd == IPVS_CMD_NEW_DAEMON ||
3053 cmd == IPVS_CMD_DEL_DAEMON) {
3054
3055 struct nlattr *daemon_attrs[IPVS_DAEMON_ATTR_MAX + 1];
3056
3057 if (!info->attrs[IPVS_CMD_ATTR_DAEMON] ||
3058 nla_parse_nested(daemon_attrs, IPVS_DAEMON_ATTR_MAX,
3059 info->attrs[IPVS_CMD_ATTR_DAEMON],
3060 ip_vs_daemon_policy)) {
3061 ret = -EINVAL;
3062 goto out;
3063 }
3064
3065 if (cmd == IPVS_CMD_NEW_DAEMON)
3066 ret = ip_vs_genl_new_daemon(daemon_attrs);
3067 else
3068 ret = ip_vs_genl_del_daemon(daemon_attrs);
3069 goto out;
3070 } else if (cmd == IPVS_CMD_ZERO &&
3071 !info->attrs[IPVS_CMD_ATTR_SERVICE]) {
3072 ret = ip_vs_zero_all();
3073 goto out;
3074 }
3075
3076 /* All following commands require a service argument, so check if we
3077 * received a valid one. We need a full service specification when
3078 * adding / editing a service. Only identifying members otherwise. */
3079 if (cmd == IPVS_CMD_NEW_SERVICE || cmd == IPVS_CMD_SET_SERVICE)
3080 need_full_svc = 1;
3081
3082 ret = ip_vs_genl_parse_service(&usvc,
3083 info->attrs[IPVS_CMD_ATTR_SERVICE],
3084 need_full_svc, &svc);
3085 if (ret)
3086 goto out;
3087
3088 /* Unless we're adding a new service, the service must already exist */
3089 if ((cmd != IPVS_CMD_NEW_SERVICE) && (svc == NULL)) {
3090 ret = -ESRCH;
3091 goto out;
3092 }
3093
3094 /* Destination commands require a valid destination argument. For
3095 * adding / editing a destination, we need a full destination
3096 * specification. */
3097 if (cmd == IPVS_CMD_NEW_DEST || cmd == IPVS_CMD_SET_DEST ||
3098 cmd == IPVS_CMD_DEL_DEST) {
3099 if (cmd != IPVS_CMD_DEL_DEST)
3100 need_full_dest = 1;
3101
3102 ret = ip_vs_genl_parse_dest(&udest,
3103 info->attrs[IPVS_CMD_ATTR_DEST],
3104 need_full_dest);
3105 if (ret)
3106 goto out;
3107 }
3108
3109 switch (cmd) {
3110 case IPVS_CMD_NEW_SERVICE:
3111 if (svc == NULL)
3112 ret = ip_vs_add_service(&usvc, &svc);
3113 else
3114 ret = -EEXIST;
3115 break;
3116 case IPVS_CMD_SET_SERVICE:
3117 ret = ip_vs_edit_service(svc, &usvc);
3118 break;
3119 case IPVS_CMD_DEL_SERVICE:
3120 ret = ip_vs_del_service(svc);
3121 /* do not use svc, it can be freed */
3122 break;
3123 case IPVS_CMD_NEW_DEST:
3124 ret = ip_vs_add_dest(svc, &udest);
3125 break;
3126 case IPVS_CMD_SET_DEST:
3127 ret = ip_vs_edit_dest(svc, &udest);
3128 break;
3129 case IPVS_CMD_DEL_DEST:
3130 ret = ip_vs_del_dest(svc, &udest);
3131 break;
3132 case IPVS_CMD_ZERO:
3133 ret = ip_vs_zero_service(svc);
3134 break;
3135 default:
3136 ret = -EINVAL;
3137 }
3138
3139 out:
3140 mutex_unlock(&__ip_vs_mutex);
3141
3142 return ret;
3143 }
3144
3145 static int ip_vs_genl_get_cmd(struct sk_buff *skb, struct genl_info *info)
3146 {
3147 struct sk_buff *msg;
3148 void *reply;
3149 int ret, cmd, reply_cmd;
3150
3151 cmd = info->genlhdr->cmd;
3152
3153 if (cmd == IPVS_CMD_GET_SERVICE)
3154 reply_cmd = IPVS_CMD_NEW_SERVICE;
3155 else if (cmd == IPVS_CMD_GET_INFO)
3156 reply_cmd = IPVS_CMD_SET_INFO;
3157 else if (cmd == IPVS_CMD_GET_CONFIG)
3158 reply_cmd = IPVS_CMD_SET_CONFIG;
3159 else {
3160 pr_err("unknown Generic Netlink command\n");
3161 return -EINVAL;
3162 }
3163
3164 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
3165 if (!msg)
3166 return -ENOMEM;
3167
3168 mutex_lock(&__ip_vs_mutex);
3169
3170 reply = genlmsg_put_reply(msg, info, &ip_vs_genl_family, 0, reply_cmd);
3171 if (reply == NULL)
3172 goto nla_put_failure;
3173
3174 switch (cmd) {
3175 case IPVS_CMD_GET_SERVICE:
3176 {
3177 struct ip_vs_service *svc;
3178
3179 svc = ip_vs_genl_find_service(info->attrs[IPVS_CMD_ATTR_SERVICE]);
3180 if (IS_ERR(svc)) {
3181 ret = PTR_ERR(svc);
3182 goto out_err;
3183 } else if (svc) {
3184 ret = ip_vs_genl_fill_service(msg, svc);
3185 if (ret)
3186 goto nla_put_failure;
3187 } else {
3188 ret = -ESRCH;
3189 goto out_err;
3190 }
3191
3192 break;
3193 }
3194
3195 case IPVS_CMD_GET_CONFIG:
3196 {
3197 struct ip_vs_timeout_user t;
3198
3199 __ip_vs_get_timeouts(&t);
3200 #ifdef CONFIG_IP_VS_PROTO_TCP
3201 NLA_PUT_U32(msg, IPVS_CMD_ATTR_TIMEOUT_TCP, t.tcp_timeout);
3202 NLA_PUT_U32(msg, IPVS_CMD_ATTR_TIMEOUT_TCP_FIN,
3203 t.tcp_fin_timeout);
3204 #endif
3205 #ifdef CONFIG_IP_VS_PROTO_UDP
3206 NLA_PUT_U32(msg, IPVS_CMD_ATTR_TIMEOUT_UDP, t.udp_timeout);
3207 #endif
3208
3209 break;
3210 }
3211
3212 case IPVS_CMD_GET_INFO:
3213 NLA_PUT_U32(msg, IPVS_INFO_ATTR_VERSION, IP_VS_VERSION_CODE);
3214 NLA_PUT_U32(msg, IPVS_INFO_ATTR_CONN_TAB_SIZE,
3215 ip_vs_conn_tab_size);
3216 break;
3217 }
3218
3219 genlmsg_end(msg, reply);
3220 ret = genlmsg_reply(msg, info);
3221 goto out;
3222
3223 nla_put_failure:
3224 pr_err("not enough space in Netlink message\n");
3225 ret = -EMSGSIZE;
3226
3227 out_err:
3228 nlmsg_free(msg);
3229 out:
3230 mutex_unlock(&__ip_vs_mutex);
3231
3232 return ret;
3233 }
3234
3235
3236 static struct genl_ops ip_vs_genl_ops[] __read_mostly = {
3237 {
3238 .cmd = IPVS_CMD_NEW_SERVICE,
3239 .flags = GENL_ADMIN_PERM,
3240 .policy = ip_vs_cmd_policy,
3241 .doit = ip_vs_genl_set_cmd,
3242 },
3243 {
3244 .cmd = IPVS_CMD_SET_SERVICE,
3245 .flags = GENL_ADMIN_PERM,
3246 .policy = ip_vs_cmd_policy,
3247 .doit = ip_vs_genl_set_cmd,
3248 },
3249 {
3250 .cmd = IPVS_CMD_DEL_SERVICE,
3251 .flags = GENL_ADMIN_PERM,
3252 .policy = ip_vs_cmd_policy,
3253 .doit = ip_vs_genl_set_cmd,
3254 },
3255 {
3256 .cmd = IPVS_CMD_GET_SERVICE,
3257 .flags = GENL_ADMIN_PERM,
3258 .doit = ip_vs_genl_get_cmd,
3259 .dumpit = ip_vs_genl_dump_services,
3260 .policy = ip_vs_cmd_policy,
3261 },
3262 {
3263 .cmd = IPVS_CMD_NEW_DEST,
3264 .flags = GENL_ADMIN_PERM,
3265 .policy = ip_vs_cmd_policy,
3266 .doit = ip_vs_genl_set_cmd,
3267 },
3268 {
3269 .cmd = IPVS_CMD_SET_DEST,
3270 .flags = GENL_ADMIN_PERM,
3271 .policy = ip_vs_cmd_policy,
3272 .doit = ip_vs_genl_set_cmd,
3273 },
3274 {
3275 .cmd = IPVS_CMD_DEL_DEST,
3276 .flags = GENL_ADMIN_PERM,
3277 .policy = ip_vs_cmd_policy,
3278 .doit = ip_vs_genl_set_cmd,
3279 },
3280 {
3281 .cmd = IPVS_CMD_GET_DEST,
3282 .flags = GENL_ADMIN_PERM,
3283 .policy = ip_vs_cmd_policy,
3284 .dumpit = ip_vs_genl_dump_dests,
3285 },
3286 {
3287 .cmd = IPVS_CMD_NEW_DAEMON,
3288 .flags = GENL_ADMIN_PERM,
3289 .policy = ip_vs_cmd_policy,
3290 .doit = ip_vs_genl_set_cmd,
3291 },
3292 {
3293 .cmd = IPVS_CMD_DEL_DAEMON,
3294 .flags = GENL_ADMIN_PERM,
3295 .policy = ip_vs_cmd_policy,
3296 .doit = ip_vs_genl_set_cmd,
3297 },
3298 {
3299 .cmd = IPVS_CMD_GET_DAEMON,
3300 .flags = GENL_ADMIN_PERM,
3301 .dumpit = ip_vs_genl_dump_daemons,
3302 },
3303 {
3304 .cmd = IPVS_CMD_SET_CONFIG,
3305 .flags = GENL_ADMIN_PERM,
3306 .policy = ip_vs_cmd_policy,
3307 .doit = ip_vs_genl_set_cmd,
3308 },
3309 {
3310 .cmd = IPVS_CMD_GET_CONFIG,
3311 .flags = GENL_ADMIN_PERM,
3312 .doit = ip_vs_genl_get_cmd,
3313 },
3314 {
3315 .cmd = IPVS_CMD_GET_INFO,
3316 .flags = GENL_ADMIN_PERM,
3317 .doit = ip_vs_genl_get_cmd,
3318 },
3319 {
3320 .cmd = IPVS_CMD_ZERO,
3321 .flags = GENL_ADMIN_PERM,
3322 .policy = ip_vs_cmd_policy,
3323 .doit = ip_vs_genl_set_cmd,
3324 },
3325 {
3326 .cmd = IPVS_CMD_FLUSH,
3327 .flags = GENL_ADMIN_PERM,
3328 .doit = ip_vs_genl_set_cmd,
3329 },
3330 };
3331
3332 static int __init ip_vs_genl_register(void)
3333 {
3334 return genl_register_family_with_ops(&ip_vs_genl_family,
3335 ip_vs_genl_ops, ARRAY_SIZE(ip_vs_genl_ops));
3336 }
3337
3338 static void ip_vs_genl_unregister(void)
3339 {
3340 genl_unregister_family(&ip_vs_genl_family);
3341 }
3342
3343 /* End of Generic Netlink interface definitions */
3344
3345
3346 int __init ip_vs_control_init(void)
3347 {
3348 int ret;
3349 int idx;
3350
3351 EnterFunction(2);
3352
3353 ret = nf_register_sockopt(&ip_vs_sockopts);
3354 if (ret) {
3355 pr_err("cannot register sockopt.\n");
3356 return ret;
3357 }
3358
3359 ret = ip_vs_genl_register();
3360 if (ret) {
3361 pr_err("cannot register Generic Netlink interface.\n");
3362 nf_unregister_sockopt(&ip_vs_sockopts);
3363 return ret;
3364 }
3365
3366 proc_net_fops_create(&init_net, "ip_vs", 0, &ip_vs_info_fops);
3367 proc_net_fops_create(&init_net, "ip_vs_stats",0, &ip_vs_stats_fops);
3368
3369 sysctl_header = register_sysctl_paths(net_vs_ctl_path, vs_vars);
3370
3371 /* Initialize ip_vs_svc_table, ip_vs_svc_fwm_table, ip_vs_rtable */
3372 for(idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
3373 INIT_LIST_HEAD(&ip_vs_svc_table[idx]);
3374 INIT_LIST_HEAD(&ip_vs_svc_fwm_table[idx]);
3375 }
3376 for(idx = 0; idx < IP_VS_RTAB_SIZE; idx++) {
3377 INIT_LIST_HEAD(&ip_vs_rtable[idx]);
3378 }
3379
3380 ip_vs_new_estimator(&ip_vs_stats);
3381
3382 /* Hook the defense timer */
3383 schedule_delayed_work(&defense_work, DEFENSE_TIMER_PERIOD);
3384
3385 LeaveFunction(2);
3386 return 0;
3387 }
3388
3389
3390 void ip_vs_control_cleanup(void)
3391 {
3392 EnterFunction(2);
3393 ip_vs_trash_cleanup();
3394 cancel_rearming_delayed_work(&defense_work);
3395 cancel_work_sync(&defense_work.work);
3396 ip_vs_kill_estimator(&ip_vs_stats);
3397 unregister_sysctl_table(sysctl_header);
3398 proc_net_remove(&init_net, "ip_vs_stats");
3399 proc_net_remove(&init_net, "ip_vs");
3400 ip_vs_genl_unregister();
3401 nf_unregister_sockopt(&ip_vs_sockopts);
3402 LeaveFunction(2);
3403 }