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 <linux/nsproxy.h>
42 #include <net/ip.h>
43 #ifdef CONFIG_IP_VS_IPV6
44 #include <net/ipv6.h>
45 #include <net/ip6_route.h>
46 #endif
47 #include <net/route.h>
48 #include <net/sock.h>
49 #include <net/genetlink.h>
50
51 #include <asm/uaccess.h>
52
53 #include <net/ip_vs.h>
54
55 /* semaphore for IPVS sockopts. And, [gs]etsockopt may sleep. */
56 static DEFINE_MUTEX(__ip_vs_mutex);
57
58 /* lock for service table */
59 static DEFINE_RWLOCK(__ip_vs_svc_lock);
60
61 /* sysctl variables */
62
63 #ifdef CONFIG_IP_VS_DEBUG
64 static int sysctl_ip_vs_debug_level = 0;
65
ip_vs_get_debug_level(void)66 int ip_vs_get_debug_level(void)
67 {
68 return sysctl_ip_vs_debug_level;
69 }
70 #endif
71
72
73 /* Protos */
74 static void __ip_vs_del_service(struct ip_vs_service *svc);
75
76
77 #ifdef CONFIG_IP_VS_IPV6
78 /* Taken from rt6_fill_node() in net/ipv6/route.c, is there a better way? */
__ip_vs_addr_is_local_v6(struct net * net,const struct in6_addr * addr)79 static int __ip_vs_addr_is_local_v6(struct net *net,
80 const struct in6_addr *addr)
81 {
82 struct rt6_info *rt;
83 struct flowi6 fl6 = {
84 .daddr = *addr,
85 };
86
87 rt = (struct rt6_info *)ip6_route_output(net, NULL, &fl6);
88 if (rt && rt->dst.dev && (rt->dst.dev->flags & IFF_LOOPBACK))
89 return 1;
90
91 return 0;
92 }
93 #endif
94
95 #ifdef CONFIG_SYSCTL
96 /*
97 * update_defense_level is called from keventd and from sysctl,
98 * so it needs to protect itself from softirqs
99 */
update_defense_level(struct netns_ipvs * ipvs)100 static void update_defense_level(struct netns_ipvs *ipvs)
101 {
102 struct sysinfo i;
103 static int old_secure_tcp = 0;
104 int availmem;
105 int nomem;
106 int to_change = -1;
107
108 /* we only count free and buffered memory (in pages) */
109 si_meminfo(&i);
110 availmem = i.freeram + i.bufferram;
111 /* however in linux 2.5 the i.bufferram is total page cache size,
112 we need adjust it */
113 /* si_swapinfo(&i); */
114 /* availmem = availmem - (i.totalswap - i.freeswap); */
115
116 nomem = (availmem < ipvs->sysctl_amemthresh);
117
118 local_bh_disable();
119
120 /* drop_entry */
121 spin_lock(&ipvs->dropentry_lock);
122 switch (ipvs->sysctl_drop_entry) {
123 case 0:
124 atomic_set(&ipvs->dropentry, 0);
125 break;
126 case 1:
127 if (nomem) {
128 atomic_set(&ipvs->dropentry, 1);
129 ipvs->sysctl_drop_entry = 2;
130 } else {
131 atomic_set(&ipvs->dropentry, 0);
132 }
133 break;
134 case 2:
135 if (nomem) {
136 atomic_set(&ipvs->dropentry, 1);
137 } else {
138 atomic_set(&ipvs->dropentry, 0);
139 ipvs->sysctl_drop_entry = 1;
140 };
141 break;
142 case 3:
143 atomic_set(&ipvs->dropentry, 1);
144 break;
145 }
146 spin_unlock(&ipvs->dropentry_lock);
147
148 /* drop_packet */
149 spin_lock(&ipvs->droppacket_lock);
150 switch (ipvs->sysctl_drop_packet) {
151 case 0:
152 ipvs->drop_rate = 0;
153 break;
154 case 1:
155 if (nomem) {
156 ipvs->drop_rate = ipvs->drop_counter
157 = ipvs->sysctl_amemthresh /
158 (ipvs->sysctl_amemthresh-availmem);
159 ipvs->sysctl_drop_packet = 2;
160 } else {
161 ipvs->drop_rate = 0;
162 }
163 break;
164 case 2:
165 if (nomem) {
166 ipvs->drop_rate = ipvs->drop_counter
167 = ipvs->sysctl_amemthresh /
168 (ipvs->sysctl_amemthresh-availmem);
169 } else {
170 ipvs->drop_rate = 0;
171 ipvs->sysctl_drop_packet = 1;
172 }
173 break;
174 case 3:
175 ipvs->drop_rate = ipvs->sysctl_am_droprate;
176 break;
177 }
178 spin_unlock(&ipvs->droppacket_lock);
179
180 /* secure_tcp */
181 spin_lock(&ipvs->securetcp_lock);
182 switch (ipvs->sysctl_secure_tcp) {
183 case 0:
184 if (old_secure_tcp >= 2)
185 to_change = 0;
186 break;
187 case 1:
188 if (nomem) {
189 if (old_secure_tcp < 2)
190 to_change = 1;
191 ipvs->sysctl_secure_tcp = 2;
192 } else {
193 if (old_secure_tcp >= 2)
194 to_change = 0;
195 }
196 break;
197 case 2:
198 if (nomem) {
199 if (old_secure_tcp < 2)
200 to_change = 1;
201 } else {
202 if (old_secure_tcp >= 2)
203 to_change = 0;
204 ipvs->sysctl_secure_tcp = 1;
205 }
206 break;
207 case 3:
208 if (old_secure_tcp < 2)
209 to_change = 1;
210 break;
211 }
212 old_secure_tcp = ipvs->sysctl_secure_tcp;
213 if (to_change >= 0)
214 ip_vs_protocol_timeout_change(ipvs,
215 ipvs->sysctl_secure_tcp > 1);
216 spin_unlock(&ipvs->securetcp_lock);
217
218 local_bh_enable();
219 }
220
221
222 /*
223 * Timer for checking the defense
224 */
225 #define DEFENSE_TIMER_PERIOD 1*HZ
226
defense_work_handler(struct work_struct * work)227 static void defense_work_handler(struct work_struct *work)
228 {
229 struct netns_ipvs *ipvs =
230 container_of(work, struct netns_ipvs, defense_work.work);
231
232 update_defense_level(ipvs);
233 if (atomic_read(&ipvs->dropentry))
234 ip_vs_random_dropentry(ipvs->net);
235 schedule_delayed_work(&ipvs->defense_work, DEFENSE_TIMER_PERIOD);
236 }
237 #endif
238
239 int
ip_vs_use_count_inc(void)240 ip_vs_use_count_inc(void)
241 {
242 return try_module_get(THIS_MODULE);
243 }
244
245 void
ip_vs_use_count_dec(void)246 ip_vs_use_count_dec(void)
247 {
248 module_put(THIS_MODULE);
249 }
250
251
252 /*
253 * Hash table: for virtual service lookups
254 */
255 #define IP_VS_SVC_TAB_BITS 8
256 #define IP_VS_SVC_TAB_SIZE (1 << IP_VS_SVC_TAB_BITS)
257 #define IP_VS_SVC_TAB_MASK (IP_VS_SVC_TAB_SIZE - 1)
258
259 /* the service table hashed by <protocol, addr, port> */
260 static struct list_head ip_vs_svc_table[IP_VS_SVC_TAB_SIZE];
261 /* the service table hashed by fwmark */
262 static struct list_head ip_vs_svc_fwm_table[IP_VS_SVC_TAB_SIZE];
263
264
265 /*
266 * Returns hash value for virtual service
267 */
268 static inline unsigned
ip_vs_svc_hashkey(struct net * net,int af,unsigned proto,const union nf_inet_addr * addr,__be16 port)269 ip_vs_svc_hashkey(struct net *net, int af, unsigned proto,
270 const union nf_inet_addr *addr, __be16 port)
271 {
272 register unsigned porth = ntohs(port);
273 __be32 addr_fold = addr->ip;
274
275 #ifdef CONFIG_IP_VS_IPV6
276 if (af == AF_INET6)
277 addr_fold = addr->ip6[0]^addr->ip6[1]^
278 addr->ip6[2]^addr->ip6[3];
279 #endif
280 addr_fold ^= ((size_t)net>>8);
281
282 return (proto^ntohl(addr_fold)^(porth>>IP_VS_SVC_TAB_BITS)^porth)
283 & IP_VS_SVC_TAB_MASK;
284 }
285
286 /*
287 * Returns hash value of fwmark for virtual service lookup
288 */
ip_vs_svc_fwm_hashkey(struct net * net,__u32 fwmark)289 static inline unsigned ip_vs_svc_fwm_hashkey(struct net *net, __u32 fwmark)
290 {
291 return (((size_t)net>>8) ^ fwmark) & IP_VS_SVC_TAB_MASK;
292 }
293
294 /*
295 * Hashes a service in the ip_vs_svc_table by <netns,proto,addr,port>
296 * or in the ip_vs_svc_fwm_table by fwmark.
297 * Should be called with locked tables.
298 */
ip_vs_svc_hash(struct ip_vs_service * svc)299 static int ip_vs_svc_hash(struct ip_vs_service *svc)
300 {
301 unsigned hash;
302
303 if (svc->flags & IP_VS_SVC_F_HASHED) {
304 pr_err("%s(): request for already hashed, called from %pF\n",
305 __func__, __builtin_return_address(0));
306 return 0;
307 }
308
309 if (svc->fwmark == 0) {
310 /*
311 * Hash it by <netns,protocol,addr,port> in ip_vs_svc_table
312 */
313 hash = ip_vs_svc_hashkey(svc->net, svc->af, svc->protocol,
314 &svc->addr, svc->port);
315 list_add(&svc->s_list, &ip_vs_svc_table[hash]);
316 } else {
317 /*
318 * Hash it by fwmark in svc_fwm_table
319 */
320 hash = ip_vs_svc_fwm_hashkey(svc->net, svc->fwmark);
321 list_add(&svc->f_list, &ip_vs_svc_fwm_table[hash]);
322 }
323
324 svc->flags |= IP_VS_SVC_F_HASHED;
325 /* increase its refcnt because it is referenced by the svc table */
326 atomic_inc(&svc->refcnt);
327 return 1;
328 }
329
330
331 /*
332 * Unhashes a service from svc_table / svc_fwm_table.
333 * Should be called with locked tables.
334 */
ip_vs_svc_unhash(struct ip_vs_service * svc)335 static int ip_vs_svc_unhash(struct ip_vs_service *svc)
336 {
337 if (!(svc->flags & IP_VS_SVC_F_HASHED)) {
338 pr_err("%s(): request for unhash flagged, called from %pF\n",
339 __func__, __builtin_return_address(0));
340 return 0;
341 }
342
343 if (svc->fwmark == 0) {
344 /* Remove it from the svc_table table */
345 list_del(&svc->s_list);
346 } else {
347 /* Remove it from the svc_fwm_table table */
348 list_del(&svc->f_list);
349 }
350
351 svc->flags &= ~IP_VS_SVC_F_HASHED;
352 atomic_dec(&svc->refcnt);
353 return 1;
354 }
355
356
357 /*
358 * Get service by {netns, proto,addr,port} in the service table.
359 */
360 static inline struct ip_vs_service *
__ip_vs_service_find(struct net * net,int af,__u16 protocol,const union nf_inet_addr * vaddr,__be16 vport)361 __ip_vs_service_find(struct net *net, int af, __u16 protocol,
362 const union nf_inet_addr *vaddr, __be16 vport)
363 {
364 unsigned hash;
365 struct ip_vs_service *svc;
366
367 /* Check for "full" addressed entries */
368 hash = ip_vs_svc_hashkey(net, af, protocol, vaddr, vport);
369
370 list_for_each_entry(svc, &ip_vs_svc_table[hash], s_list){
371 if ((svc->af == af)
372 && ip_vs_addr_equal(af, &svc->addr, vaddr)
373 && (svc->port == vport)
374 && (svc->protocol == protocol)
375 && net_eq(svc->net, net)) {
376 /* HIT */
377 return svc;
378 }
379 }
380
381 return NULL;
382 }
383
384
385 /*
386 * Get service by {fwmark} in the service table.
387 */
388 static inline struct ip_vs_service *
__ip_vs_svc_fwm_find(struct net * net,int af,__u32 fwmark)389 __ip_vs_svc_fwm_find(struct net *net, int af, __u32 fwmark)
390 {
391 unsigned hash;
392 struct ip_vs_service *svc;
393
394 /* Check for fwmark addressed entries */
395 hash = ip_vs_svc_fwm_hashkey(net, fwmark);
396
397 list_for_each_entry(svc, &ip_vs_svc_fwm_table[hash], f_list) {
398 if (svc->fwmark == fwmark && svc->af == af
399 && net_eq(svc->net, net)) {
400 /* HIT */
401 return svc;
402 }
403 }
404
405 return NULL;
406 }
407
408 struct ip_vs_service *
ip_vs_service_get(struct net * net,int af,__u32 fwmark,__u16 protocol,const union nf_inet_addr * vaddr,__be16 vport)409 ip_vs_service_get(struct net *net, int af, __u32 fwmark, __u16 protocol,
410 const union nf_inet_addr *vaddr, __be16 vport)
411 {
412 struct ip_vs_service *svc;
413 struct netns_ipvs *ipvs = net_ipvs(net);
414
415 read_lock(&__ip_vs_svc_lock);
416
417 /*
418 * Check the table hashed by fwmark first
419 */
420 if (fwmark) {
421 svc = __ip_vs_svc_fwm_find(net, af, fwmark);
422 if (svc)
423 goto out;
424 }
425
426 /*
427 * Check the table hashed by <protocol,addr,port>
428 * for "full" addressed entries
429 */
430 svc = __ip_vs_service_find(net, af, protocol, vaddr, vport);
431
432 if (svc == NULL
433 && protocol == IPPROTO_TCP
434 && atomic_read(&ipvs->ftpsvc_counter)
435 && (vport == FTPDATA || ntohs(vport) >= PROT_SOCK)) {
436 /*
437 * Check if ftp service entry exists, the packet
438 * might belong to FTP data connections.
439 */
440 svc = __ip_vs_service_find(net, af, protocol, vaddr, FTPPORT);
441 }
442
443 if (svc == NULL
444 && atomic_read(&ipvs->nullsvc_counter)) {
445 /*
446 * Check if the catch-all port (port zero) exists
447 */
448 svc = __ip_vs_service_find(net, af, protocol, vaddr, 0);
449 }
450
451 out:
452 if (svc)
453 atomic_inc(&svc->usecnt);
454 read_unlock(&__ip_vs_svc_lock);
455
456 IP_VS_DBG_BUF(9, "lookup service: fwm %u %s %s:%u %s\n",
457 fwmark, ip_vs_proto_name(protocol),
458 IP_VS_DBG_ADDR(af, vaddr), ntohs(vport),
459 svc ? "hit" : "not hit");
460
461 return svc;
462 }
463
464
465 static inline void
__ip_vs_bind_svc(struct ip_vs_dest * dest,struct ip_vs_service * svc)466 __ip_vs_bind_svc(struct ip_vs_dest *dest, struct ip_vs_service *svc)
467 {
468 atomic_inc(&svc->refcnt);
469 dest->svc = svc;
470 }
471
472 static void
__ip_vs_unbind_svc(struct ip_vs_dest * dest)473 __ip_vs_unbind_svc(struct ip_vs_dest *dest)
474 {
475 struct ip_vs_service *svc = dest->svc;
476
477 dest->svc = NULL;
478 if (atomic_dec_and_test(&svc->refcnt)) {
479 IP_VS_DBG_BUF(3, "Removing service %u/%s:%u usecnt=%d\n",
480 svc->fwmark,
481 IP_VS_DBG_ADDR(svc->af, &svc->addr),
482 ntohs(svc->port), atomic_read(&svc->usecnt));
483 free_percpu(svc->stats.cpustats);
484 kfree(svc);
485 }
486 }
487
488
489 /*
490 * Returns hash value for real service
491 */
ip_vs_rs_hashkey(int af,const union nf_inet_addr * addr,__be16 port)492 static inline unsigned ip_vs_rs_hashkey(int af,
493 const union nf_inet_addr *addr,
494 __be16 port)
495 {
496 register unsigned porth = ntohs(port);
497 __be32 addr_fold = addr->ip;
498
499 #ifdef CONFIG_IP_VS_IPV6
500 if (af == AF_INET6)
501 addr_fold = addr->ip6[0]^addr->ip6[1]^
502 addr->ip6[2]^addr->ip6[3];
503 #endif
504
505 return (ntohl(addr_fold)^(porth>>IP_VS_RTAB_BITS)^porth)
506 & IP_VS_RTAB_MASK;
507 }
508
509 /*
510 * Hashes ip_vs_dest in rs_table by <proto,addr,port>.
511 * should be called with locked tables.
512 */
ip_vs_rs_hash(struct netns_ipvs * ipvs,struct ip_vs_dest * dest)513 static int ip_vs_rs_hash(struct netns_ipvs *ipvs, struct ip_vs_dest *dest)
514 {
515 unsigned hash;
516
517 if (!list_empty(&dest->d_list)) {
518 return 0;
519 }
520
521 /*
522 * Hash by proto,addr,port,
523 * which are the parameters of the real service.
524 */
525 hash = ip_vs_rs_hashkey(dest->af, &dest->addr, dest->port);
526
527 list_add(&dest->d_list, &ipvs->rs_table[hash]);
528
529 return 1;
530 }
531
532 /*
533 * UNhashes ip_vs_dest from rs_table.
534 * should be called with locked tables.
535 */
ip_vs_rs_unhash(struct ip_vs_dest * dest)536 static int ip_vs_rs_unhash(struct ip_vs_dest *dest)
537 {
538 /*
539 * Remove it from the rs_table table.
540 */
541 if (!list_empty(&dest->d_list)) {
542 list_del(&dest->d_list);
543 INIT_LIST_HEAD(&dest->d_list);
544 }
545
546 return 1;
547 }
548
549 /*
550 * Lookup real service by <proto,addr,port> in the real service table.
551 */
552 struct ip_vs_dest *
ip_vs_lookup_real_service(struct net * net,int af,__u16 protocol,const union nf_inet_addr * daddr,__be16 dport)553 ip_vs_lookup_real_service(struct net *net, int af, __u16 protocol,
554 const union nf_inet_addr *daddr,
555 __be16 dport)
556 {
557 struct netns_ipvs *ipvs = net_ipvs(net);
558 unsigned hash;
559 struct ip_vs_dest *dest;
560
561 /*
562 * Check for "full" addressed entries
563 * Return the first found entry
564 */
565 hash = ip_vs_rs_hashkey(af, daddr, dport);
566
567 read_lock(&ipvs->rs_lock);
568 list_for_each_entry(dest, &ipvs->rs_table[hash], d_list) {
569 if ((dest->af == af)
570 && ip_vs_addr_equal(af, &dest->addr, daddr)
571 && (dest->port == dport)
572 && ((dest->protocol == protocol) ||
573 dest->vfwmark)) {
574 /* HIT */
575 read_unlock(&ipvs->rs_lock);
576 return dest;
577 }
578 }
579 read_unlock(&ipvs->rs_lock);
580
581 return NULL;
582 }
583
584 /*
585 * Lookup destination by {addr,port} in the given service
586 */
587 static struct ip_vs_dest *
ip_vs_lookup_dest(struct ip_vs_service * svc,const union nf_inet_addr * daddr,__be16 dport)588 ip_vs_lookup_dest(struct ip_vs_service *svc, const union nf_inet_addr *daddr,
589 __be16 dport)
590 {
591 struct ip_vs_dest *dest;
592
593 /*
594 * Find the destination for the given service
595 */
596 list_for_each_entry(dest, &svc->destinations, n_list) {
597 if ((dest->af == svc->af)
598 && ip_vs_addr_equal(svc->af, &dest->addr, daddr)
599 && (dest->port == dport)) {
600 /* HIT */
601 return dest;
602 }
603 }
604
605 return NULL;
606 }
607
608 /*
609 * Find destination by {daddr,dport,vaddr,protocol}
610 * Cretaed to be used in ip_vs_process_message() in
611 * the backup synchronization daemon. It finds the
612 * destination to be bound to the received connection
613 * on the backup.
614 *
615 * ip_vs_lookup_real_service() looked promissing, but
616 * seems not working as expected.
617 */
ip_vs_find_dest(struct net * net,int af,const union nf_inet_addr * daddr,__be16 dport,const union nf_inet_addr * vaddr,__be16 vport,__u16 protocol,__u32 fwmark,__u32 flags)618 struct ip_vs_dest *ip_vs_find_dest(struct net *net, int af,
619 const union nf_inet_addr *daddr,
620 __be16 dport,
621 const union nf_inet_addr *vaddr,
622 __be16 vport, __u16 protocol, __u32 fwmark,
623 __u32 flags)
624 {
625 struct ip_vs_dest *dest;
626 struct ip_vs_service *svc;
627 __be16 port = dport;
628
629 svc = ip_vs_service_get(net, af, fwmark, protocol, vaddr, vport);
630 if (!svc)
631 return NULL;
632 if (fwmark && (flags & IP_VS_CONN_F_FWD_MASK) != IP_VS_CONN_F_MASQ)
633 port = 0;
634 dest = ip_vs_lookup_dest(svc, daddr, port);
635 if (!dest)
636 dest = ip_vs_lookup_dest(svc, daddr, port ^ dport);
637 if (dest)
638 atomic_inc(&dest->refcnt);
639 ip_vs_service_put(svc);
640 return dest;
641 }
642
643 /*
644 * Lookup dest by {svc,addr,port} in the destination trash.
645 * The destination trash is used to hold the destinations that are removed
646 * from the service table but are still referenced by some conn entries.
647 * The reason to add the destination trash is when the dest is temporary
648 * down (either by administrator or by monitor program), the dest can be
649 * picked back from the trash, the remaining connections to the dest can
650 * continue, and the counting information of the dest is also useful for
651 * scheduling.
652 */
653 static struct ip_vs_dest *
ip_vs_trash_get_dest(struct ip_vs_service * svc,const union nf_inet_addr * daddr,__be16 dport)654 ip_vs_trash_get_dest(struct ip_vs_service *svc, const union nf_inet_addr *daddr,
655 __be16 dport)
656 {
657 struct ip_vs_dest *dest, *nxt;
658 struct netns_ipvs *ipvs = net_ipvs(svc->net);
659
660 /*
661 * Find the destination in trash
662 */
663 list_for_each_entry_safe(dest, nxt, &ipvs->dest_trash, n_list) {
664 IP_VS_DBG_BUF(3, "Destination %u/%s:%u still in trash, "
665 "dest->refcnt=%d\n",
666 dest->vfwmark,
667 IP_VS_DBG_ADDR(svc->af, &dest->addr),
668 ntohs(dest->port),
669 atomic_read(&dest->refcnt));
670 if (dest->af == svc->af &&
671 ip_vs_addr_equal(svc->af, &dest->addr, daddr) &&
672 dest->port == dport &&
673 dest->vfwmark == svc->fwmark &&
674 dest->protocol == svc->protocol &&
675 (svc->fwmark ||
676 (ip_vs_addr_equal(svc->af, &dest->vaddr, &svc->addr) &&
677 dest->vport == svc->port))) {
678 /* HIT */
679 return dest;
680 }
681
682 /*
683 * Try to purge the destination from trash if not referenced
684 */
685 if (atomic_read(&dest->refcnt) == 1) {
686 IP_VS_DBG_BUF(3, "Removing destination %u/%s:%u "
687 "from trash\n",
688 dest->vfwmark,
689 IP_VS_DBG_ADDR(svc->af, &dest->addr),
690 ntohs(dest->port));
691 list_del(&dest->n_list);
692 ip_vs_dst_reset(dest);
693 __ip_vs_unbind_svc(dest);
694 free_percpu(dest->stats.cpustats);
695 kfree(dest);
696 }
697 }
698
699 return NULL;
700 }
701
702
703 /*
704 * Clean up all the destinations in the trash
705 * Called by the ip_vs_control_cleanup()
706 *
707 * When the ip_vs_control_clearup is activated by ipvs module exit,
708 * the service tables must have been flushed and all the connections
709 * are expired, and the refcnt of each destination in the trash must
710 * be 1, so we simply release them here.
711 */
ip_vs_trash_cleanup(struct net * net)712 static void ip_vs_trash_cleanup(struct net *net)
713 {
714 struct ip_vs_dest *dest, *nxt;
715 struct netns_ipvs *ipvs = net_ipvs(net);
716
717 list_for_each_entry_safe(dest, nxt, &ipvs->dest_trash, n_list) {
718 list_del(&dest->n_list);
719 ip_vs_dst_reset(dest);
720 __ip_vs_unbind_svc(dest);
721 free_percpu(dest->stats.cpustats);
722 kfree(dest);
723 }
724 }
725
726 static void
ip_vs_copy_stats(struct ip_vs_stats_user * dst,struct ip_vs_stats * src)727 ip_vs_copy_stats(struct ip_vs_stats_user *dst, struct ip_vs_stats *src)
728 {
729 #define IP_VS_SHOW_STATS_COUNTER(c) dst->c = src->ustats.c - src->ustats0.c
730
731 spin_lock_bh(&src->lock);
732
733 IP_VS_SHOW_STATS_COUNTER(conns);
734 IP_VS_SHOW_STATS_COUNTER(inpkts);
735 IP_VS_SHOW_STATS_COUNTER(outpkts);
736 IP_VS_SHOW_STATS_COUNTER(inbytes);
737 IP_VS_SHOW_STATS_COUNTER(outbytes);
738
739 ip_vs_read_estimator(dst, src);
740
741 spin_unlock_bh(&src->lock);
742 }
743
744 static void
ip_vs_zero_stats(struct ip_vs_stats * stats)745 ip_vs_zero_stats(struct ip_vs_stats *stats)
746 {
747 spin_lock_bh(&stats->lock);
748
749 /* get current counters as zero point, rates are zeroed */
750
751 #define IP_VS_ZERO_STATS_COUNTER(c) stats->ustats0.c = stats->ustats.c
752
753 IP_VS_ZERO_STATS_COUNTER(conns);
754 IP_VS_ZERO_STATS_COUNTER(inpkts);
755 IP_VS_ZERO_STATS_COUNTER(outpkts);
756 IP_VS_ZERO_STATS_COUNTER(inbytes);
757 IP_VS_ZERO_STATS_COUNTER(outbytes);
758
759 ip_vs_zero_estimator(stats);
760
761 spin_unlock_bh(&stats->lock);
762 }
763
764 /*
765 * Update a destination in the given service
766 */
767 static void
__ip_vs_update_dest(struct ip_vs_service * svc,struct ip_vs_dest * dest,struct ip_vs_dest_user_kern * udest,int add)768 __ip_vs_update_dest(struct ip_vs_service *svc, struct ip_vs_dest *dest,
769 struct ip_vs_dest_user_kern *udest, int add)
770 {
771 struct netns_ipvs *ipvs = net_ipvs(svc->net);
772 int conn_flags;
773
774 /* set the weight and the flags */
775 atomic_set(&dest->weight, udest->weight);
776 conn_flags = udest->conn_flags & IP_VS_CONN_F_DEST_MASK;
777 conn_flags |= IP_VS_CONN_F_INACTIVE;
778
779 /* set the IP_VS_CONN_F_NOOUTPUT flag if not masquerading/NAT */
780 if ((conn_flags & IP_VS_CONN_F_FWD_MASK) != IP_VS_CONN_F_MASQ) {
781 conn_flags |= IP_VS_CONN_F_NOOUTPUT;
782 } else {
783 /*
784 * Put the real service in rs_table if not present.
785 * For now only for NAT!
786 */
787 write_lock_bh(&ipvs->rs_lock);
788 ip_vs_rs_hash(ipvs, dest);
789 write_unlock_bh(&ipvs->rs_lock);
790 }
791 atomic_set(&dest->conn_flags, conn_flags);
792
793 /* bind the service */
794 if (!dest->svc) {
795 __ip_vs_bind_svc(dest, svc);
796 } else {
797 if (dest->svc != svc) {
798 __ip_vs_unbind_svc(dest);
799 ip_vs_zero_stats(&dest->stats);
800 __ip_vs_bind_svc(dest, svc);
801 }
802 }
803
804 /* set the dest status flags */
805 dest->flags |= IP_VS_DEST_F_AVAILABLE;
806
807 if (udest->u_threshold == 0 || udest->u_threshold > dest->u_threshold)
808 dest->flags &= ~IP_VS_DEST_F_OVERLOAD;
809 dest->u_threshold = udest->u_threshold;
810 dest->l_threshold = udest->l_threshold;
811
812 spin_lock_bh(&dest->dst_lock);
813 ip_vs_dst_reset(dest);
814 spin_unlock_bh(&dest->dst_lock);
815
816 if (add)
817 ip_vs_start_estimator(svc->net, &dest->stats);
818
819 write_lock_bh(&__ip_vs_svc_lock);
820
821 /* Wait until all other svc users go away */
822 IP_VS_WAIT_WHILE(atomic_read(&svc->usecnt) > 0);
823
824 if (add) {
825 list_add(&dest->n_list, &svc->destinations);
826 svc->num_dests++;
827 }
828
829 /* call the update_service, because server weight may be changed */
830 if (svc->scheduler->update_service)
831 svc->scheduler->update_service(svc);
832
833 write_unlock_bh(&__ip_vs_svc_lock);
834 }
835
836
837 /*
838 * Create a destination for the given service
839 */
840 static int
ip_vs_new_dest(struct ip_vs_service * svc,struct ip_vs_dest_user_kern * udest,struct ip_vs_dest ** dest_p)841 ip_vs_new_dest(struct ip_vs_service *svc, struct ip_vs_dest_user_kern *udest,
842 struct ip_vs_dest **dest_p)
843 {
844 struct ip_vs_dest *dest;
845 unsigned atype;
846
847 EnterFunction(2);
848
849 #ifdef CONFIG_IP_VS_IPV6
850 if (svc->af == AF_INET6) {
851 atype = ipv6_addr_type(&udest->addr.in6);
852 if ((!(atype & IPV6_ADDR_UNICAST) ||
853 atype & IPV6_ADDR_LINKLOCAL) &&
854 !__ip_vs_addr_is_local_v6(svc->net, &udest->addr.in6))
855 return -EINVAL;
856 } else
857 #endif
858 {
859 atype = inet_addr_type(svc->net, udest->addr.ip);
860 if (atype != RTN_LOCAL && atype != RTN_UNICAST)
861 return -EINVAL;
862 }
863
864 dest = kzalloc(sizeof(struct ip_vs_dest), GFP_KERNEL);
865 if (dest == NULL)
866 return -ENOMEM;
867
868 dest->stats.cpustats = alloc_percpu(struct ip_vs_cpu_stats);
869 if (!dest->stats.cpustats)
870 goto err_alloc;
871
872 dest->af = svc->af;
873 dest->protocol = svc->protocol;
874 dest->vaddr = svc->addr;
875 dest->vport = svc->port;
876 dest->vfwmark = svc->fwmark;
877 ip_vs_addr_copy(svc->af, &dest->addr, &udest->addr);
878 dest->port = udest->port;
879
880 atomic_set(&dest->activeconns, 0);
881 atomic_set(&dest->inactconns, 0);
882 atomic_set(&dest->persistconns, 0);
883 atomic_set(&dest->refcnt, 1);
884
885 INIT_LIST_HEAD(&dest->d_list);
886 spin_lock_init(&dest->dst_lock);
887 spin_lock_init(&dest->stats.lock);
888 __ip_vs_update_dest(svc, dest, udest, 1);
889
890 *dest_p = dest;
891
892 LeaveFunction(2);
893 return 0;
894
895 err_alloc:
896 kfree(dest);
897 return -ENOMEM;
898 }
899
900
901 /*
902 * Add a destination into an existing service
903 */
904 static int
ip_vs_add_dest(struct ip_vs_service * svc,struct ip_vs_dest_user_kern * udest)905 ip_vs_add_dest(struct ip_vs_service *svc, struct ip_vs_dest_user_kern *udest)
906 {
907 struct ip_vs_dest *dest;
908 union nf_inet_addr daddr;
909 __be16 dport = udest->port;
910 int ret;
911
912 EnterFunction(2);
913
914 if (udest->weight < 0) {
915 pr_err("%s(): server weight less than zero\n", __func__);
916 return -ERANGE;
917 }
918
919 if (udest->l_threshold > udest->u_threshold) {
920 pr_err("%s(): lower threshold is higher than upper threshold\n",
921 __func__);
922 return -ERANGE;
923 }
924
925 ip_vs_addr_copy(svc->af, &daddr, &udest->addr);
926
927 /*
928 * Check if the dest already exists in the list
929 */
930 dest = ip_vs_lookup_dest(svc, &daddr, dport);
931
932 if (dest != NULL) {
933 IP_VS_DBG(1, "%s(): dest already exists\n", __func__);
934 return -EEXIST;
935 }
936
937 /*
938 * Check if the dest already exists in the trash and
939 * is from the same service
940 */
941 dest = ip_vs_trash_get_dest(svc, &daddr, dport);
942
943 if (dest != NULL) {
944 IP_VS_DBG_BUF(3, "Get destination %s:%u from trash, "
945 "dest->refcnt=%d, service %u/%s:%u\n",
946 IP_VS_DBG_ADDR(svc->af, &daddr), ntohs(dport),
947 atomic_read(&dest->refcnt),
948 dest->vfwmark,
949 IP_VS_DBG_ADDR(svc->af, &dest->vaddr),
950 ntohs(dest->vport));
951
952 /*
953 * Get the destination from the trash
954 */
955 list_del(&dest->n_list);
956
957 __ip_vs_update_dest(svc, dest, udest, 1);
958 ret = 0;
959 } else {
960 /*
961 * Allocate and initialize the dest structure
962 */
963 ret = ip_vs_new_dest(svc, udest, &dest);
964 }
965 LeaveFunction(2);
966
967 return ret;
968 }
969
970
971 /*
972 * Edit a destination in the given service
973 */
974 static int
ip_vs_edit_dest(struct ip_vs_service * svc,struct ip_vs_dest_user_kern * udest)975 ip_vs_edit_dest(struct ip_vs_service *svc, struct ip_vs_dest_user_kern *udest)
976 {
977 struct ip_vs_dest *dest;
978 union nf_inet_addr daddr;
979 __be16 dport = udest->port;
980
981 EnterFunction(2);
982
983 if (udest->weight < 0) {
984 pr_err("%s(): server weight less than zero\n", __func__);
985 return -ERANGE;
986 }
987
988 if (udest->l_threshold > udest->u_threshold) {
989 pr_err("%s(): lower threshold is higher than upper threshold\n",
990 __func__);
991 return -ERANGE;
992 }
993
994 ip_vs_addr_copy(svc->af, &daddr, &udest->addr);
995
996 /*
997 * Lookup the destination list
998 */
999 dest = ip_vs_lookup_dest(svc, &daddr, dport);
1000
1001 if (dest == NULL) {
1002 IP_VS_DBG(1, "%s(): dest doesn't exist\n", __func__);
1003 return -ENOENT;
1004 }
1005
1006 __ip_vs_update_dest(svc, dest, udest, 0);
1007 LeaveFunction(2);
1008
1009 return 0;
1010 }
1011
1012
1013 /*
1014 * Delete a destination (must be already unlinked from the service)
1015 */
__ip_vs_del_dest(struct net * net,struct ip_vs_dest * dest)1016 static void __ip_vs_del_dest(struct net *net, struct ip_vs_dest *dest)
1017 {
1018 struct netns_ipvs *ipvs = net_ipvs(net);
1019
1020 ip_vs_stop_estimator(net, &dest->stats);
1021
1022 /*
1023 * Remove it from the d-linked list with the real services.
1024 */
1025 write_lock_bh(&ipvs->rs_lock);
1026 ip_vs_rs_unhash(dest);
1027 write_unlock_bh(&ipvs->rs_lock);
1028
1029 /*
1030 * Decrease the refcnt of the dest, and free the dest
1031 * if nobody refers to it (refcnt=0). Otherwise, throw
1032 * the destination into the trash.
1033 */
1034 if (atomic_dec_and_test(&dest->refcnt)) {
1035 IP_VS_DBG_BUF(3, "Removing destination %u/%s:%u\n",
1036 dest->vfwmark,
1037 IP_VS_DBG_ADDR(dest->af, &dest->addr),
1038 ntohs(dest->port));
1039 ip_vs_dst_reset(dest);
1040 /* simply decrease svc->refcnt here, let the caller check
1041 and release the service if nobody refers to it.
1042 Only user context can release destination and service,
1043 and only one user context can update virtual service at a
1044 time, so the operation here is OK */
1045 atomic_dec(&dest->svc->refcnt);
1046 free_percpu(dest->stats.cpustats);
1047 kfree(dest);
1048 } else {
1049 IP_VS_DBG_BUF(3, "Moving dest %s:%u into trash, "
1050 "dest->refcnt=%d\n",
1051 IP_VS_DBG_ADDR(dest->af, &dest->addr),
1052 ntohs(dest->port),
1053 atomic_read(&dest->refcnt));
1054 list_add(&dest->n_list, &ipvs->dest_trash);
1055 atomic_inc(&dest->refcnt);
1056 }
1057 }
1058
1059
1060 /*
1061 * Unlink a destination from the given service
1062 */
__ip_vs_unlink_dest(struct ip_vs_service * svc,struct ip_vs_dest * dest,int svcupd)1063 static void __ip_vs_unlink_dest(struct ip_vs_service *svc,
1064 struct ip_vs_dest *dest,
1065 int svcupd)
1066 {
1067 dest->flags &= ~IP_VS_DEST_F_AVAILABLE;
1068
1069 /*
1070 * Remove it from the d-linked destination list.
1071 */
1072 list_del(&dest->n_list);
1073 svc->num_dests--;
1074
1075 /*
1076 * Call the update_service function of its scheduler
1077 */
1078 if (svcupd && svc->scheduler->update_service)
1079 svc->scheduler->update_service(svc);
1080 }
1081
1082
1083 /*
1084 * Delete a destination server in the given service
1085 */
1086 static int
ip_vs_del_dest(struct ip_vs_service * svc,struct ip_vs_dest_user_kern * udest)1087 ip_vs_del_dest(struct ip_vs_service *svc, struct ip_vs_dest_user_kern *udest)
1088 {
1089 struct ip_vs_dest *dest;
1090 __be16 dport = udest->port;
1091
1092 EnterFunction(2);
1093
1094 dest = ip_vs_lookup_dest(svc, &udest->addr, dport);
1095
1096 if (dest == NULL) {
1097 IP_VS_DBG(1, "%s(): destination not found!\n", __func__);
1098 return -ENOENT;
1099 }
1100
1101 write_lock_bh(&__ip_vs_svc_lock);
1102
1103 /*
1104 * Wait until all other svc users go away.
1105 */
1106 IP_VS_WAIT_WHILE(atomic_read(&svc->usecnt) > 0);
1107
1108 /*
1109 * Unlink dest from the service
1110 */
1111 __ip_vs_unlink_dest(svc, dest, 1);
1112
1113 write_unlock_bh(&__ip_vs_svc_lock);
1114
1115 /*
1116 * Delete the destination
1117 */
1118 __ip_vs_del_dest(svc->net, dest);
1119
1120 LeaveFunction(2);
1121
1122 return 0;
1123 }
1124
1125
1126 /*
1127 * Add a service into the service hash table
1128 */
1129 static int
ip_vs_add_service(struct net * net,struct ip_vs_service_user_kern * u,struct ip_vs_service ** svc_p)1130 ip_vs_add_service(struct net *net, struct ip_vs_service_user_kern *u,
1131 struct ip_vs_service **svc_p)
1132 {
1133 int ret = 0;
1134 struct ip_vs_scheduler *sched = NULL;
1135 struct ip_vs_pe *pe = NULL;
1136 struct ip_vs_service *svc = NULL;
1137 struct netns_ipvs *ipvs = net_ipvs(net);
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 if (u->pe_name && *u->pe_name) {
1151 pe = ip_vs_pe_getbyname(u->pe_name);
1152 if (pe == NULL) {
1153 pr_info("persistence engine module ip_vs_pe_%s "
1154 "not found\n", u->pe_name);
1155 ret = -ENOENT;
1156 goto out_err;
1157 }
1158 }
1159
1160 #ifdef CONFIG_IP_VS_IPV6
1161 if (u->af == AF_INET6 && (u->netmask < 1 || u->netmask > 128)) {
1162 ret = -EINVAL;
1163 goto out_err;
1164 }
1165 #endif
1166
1167 svc = kzalloc(sizeof(struct ip_vs_service), GFP_KERNEL);
1168 if (svc == NULL) {
1169 IP_VS_DBG(1, "%s(): no memory\n", __func__);
1170 ret = -ENOMEM;
1171 goto out_err;
1172 }
1173 svc->stats.cpustats = alloc_percpu(struct ip_vs_cpu_stats);
1174 if (!svc->stats.cpustats)
1175 goto out_err;
1176
1177 /* I'm the first user of the service */
1178 atomic_set(&svc->usecnt, 0);
1179 atomic_set(&svc->refcnt, 0);
1180
1181 svc->af = u->af;
1182 svc->protocol = u->protocol;
1183 ip_vs_addr_copy(svc->af, &svc->addr, &u->addr);
1184 svc->port = u->port;
1185 svc->fwmark = u->fwmark;
1186 svc->flags = u->flags;
1187 svc->timeout = u->timeout * HZ;
1188 svc->netmask = u->netmask;
1189 svc->net = net;
1190
1191 INIT_LIST_HEAD(&svc->destinations);
1192 rwlock_init(&svc->sched_lock);
1193 spin_lock_init(&svc->stats.lock);
1194
1195 /* Bind the scheduler */
1196 ret = ip_vs_bind_scheduler(svc, sched);
1197 if (ret)
1198 goto out_err;
1199 sched = NULL;
1200
1201 /* Bind the ct retriever */
1202 ip_vs_bind_pe(svc, pe);
1203 pe = NULL;
1204
1205 /* Update the virtual service counters */
1206 if (svc->port == FTPPORT)
1207 atomic_inc(&ipvs->ftpsvc_counter);
1208 else if (svc->port == 0)
1209 atomic_inc(&ipvs->nullsvc_counter);
1210
1211 ip_vs_start_estimator(net, &svc->stats);
1212
1213 /* Count only IPv4 services for old get/setsockopt interface */
1214 if (svc->af == AF_INET)
1215 ipvs->num_services++;
1216
1217 /* Hash the service into the service table */
1218 write_lock_bh(&__ip_vs_svc_lock);
1219 ip_vs_svc_hash(svc);
1220 write_unlock_bh(&__ip_vs_svc_lock);
1221
1222 *svc_p = svc;
1223 /* Now there is a service - full throttle */
1224 ipvs->enable = 1;
1225 return 0;
1226
1227
1228 out_err:
1229 if (svc != NULL) {
1230 ip_vs_unbind_scheduler(svc);
1231 if (svc->inc) {
1232 local_bh_disable();
1233 ip_vs_app_inc_put(svc->inc);
1234 local_bh_enable();
1235 }
1236 if (svc->stats.cpustats)
1237 free_percpu(svc->stats.cpustats);
1238 kfree(svc);
1239 }
1240 ip_vs_scheduler_put(sched);
1241 ip_vs_pe_put(pe);
1242
1243 /* decrease the module use count */
1244 ip_vs_use_count_dec();
1245
1246 return ret;
1247 }
1248
1249
1250 /*
1251 * Edit a service and bind it with a new scheduler
1252 */
1253 static int
ip_vs_edit_service(struct ip_vs_service * svc,struct ip_vs_service_user_kern * u)1254 ip_vs_edit_service(struct ip_vs_service *svc, struct ip_vs_service_user_kern *u)
1255 {
1256 struct ip_vs_scheduler *sched, *old_sched;
1257 struct ip_vs_pe *pe = NULL, *old_pe = NULL;
1258 int ret = 0;
1259
1260 /*
1261 * Lookup the scheduler, by 'u->sched_name'
1262 */
1263 sched = ip_vs_scheduler_get(u->sched_name);
1264 if (sched == NULL) {
1265 pr_info("Scheduler module ip_vs_%s not found\n", u->sched_name);
1266 return -ENOENT;
1267 }
1268 old_sched = sched;
1269
1270 if (u->pe_name && *u->pe_name) {
1271 pe = ip_vs_pe_getbyname(u->pe_name);
1272 if (pe == NULL) {
1273 pr_info("persistence engine module ip_vs_pe_%s "
1274 "not found\n", u->pe_name);
1275 ret = -ENOENT;
1276 goto out;
1277 }
1278 old_pe = pe;
1279 }
1280
1281 #ifdef CONFIG_IP_VS_IPV6
1282 if (u->af == AF_INET6 && (u->netmask < 1 || u->netmask > 128)) {
1283 ret = -EINVAL;
1284 goto out;
1285 }
1286 #endif
1287
1288 write_lock_bh(&__ip_vs_svc_lock);
1289
1290 /*
1291 * Wait until all other svc users go away.
1292 */
1293 IP_VS_WAIT_WHILE(atomic_read(&svc->usecnt) > 0);
1294
1295 /*
1296 * Set the flags and timeout value
1297 */
1298 svc->flags = u->flags | IP_VS_SVC_F_HASHED;
1299 svc->timeout = u->timeout * HZ;
1300 svc->netmask = u->netmask;
1301
1302 old_sched = svc->scheduler;
1303 if (sched != old_sched) {
1304 /*
1305 * Unbind the old scheduler
1306 */
1307 if ((ret = ip_vs_unbind_scheduler(svc))) {
1308 old_sched = sched;
1309 goto out_unlock;
1310 }
1311
1312 /*
1313 * Bind the new scheduler
1314 */
1315 if ((ret = ip_vs_bind_scheduler(svc, sched))) {
1316 /*
1317 * If ip_vs_bind_scheduler fails, restore the old
1318 * scheduler.
1319 * The main reason of failure is out of memory.
1320 *
1321 * The question is if the old scheduler can be
1322 * restored all the time. TODO: if it cannot be
1323 * restored some time, we must delete the service,
1324 * otherwise the system may crash.
1325 */
1326 ip_vs_bind_scheduler(svc, old_sched);
1327 old_sched = sched;
1328 goto out_unlock;
1329 }
1330 }
1331
1332 old_pe = svc->pe;
1333 if (pe != old_pe) {
1334 ip_vs_unbind_pe(svc);
1335 ip_vs_bind_pe(svc, pe);
1336 }
1337
1338 out_unlock:
1339 write_unlock_bh(&__ip_vs_svc_lock);
1340 out:
1341 ip_vs_scheduler_put(old_sched);
1342 ip_vs_pe_put(old_pe);
1343 return ret;
1344 }
1345
1346
1347 /*
1348 * Delete a service from the service list
1349 * - The service must be unlinked, unlocked and not referenced!
1350 * - We are called under _bh lock
1351 */
__ip_vs_del_service(struct ip_vs_service * svc)1352 static void __ip_vs_del_service(struct ip_vs_service *svc)
1353 {
1354 struct ip_vs_dest *dest, *nxt;
1355 struct ip_vs_scheduler *old_sched;
1356 struct ip_vs_pe *old_pe;
1357 struct netns_ipvs *ipvs = net_ipvs(svc->net);
1358
1359 pr_info("%s: enter\n", __func__);
1360
1361 /* Count only IPv4 services for old get/setsockopt interface */
1362 if (svc->af == AF_INET)
1363 ipvs->num_services--;
1364
1365 ip_vs_stop_estimator(svc->net, &svc->stats);
1366
1367 /* Unbind scheduler */
1368 old_sched = svc->scheduler;
1369 ip_vs_unbind_scheduler(svc);
1370 ip_vs_scheduler_put(old_sched);
1371
1372 /* Unbind persistence engine */
1373 old_pe = svc->pe;
1374 ip_vs_unbind_pe(svc);
1375 ip_vs_pe_put(old_pe);
1376
1377 /* Unbind app inc */
1378 if (svc->inc) {
1379 ip_vs_app_inc_put(svc->inc);
1380 svc->inc = NULL;
1381 }
1382
1383 /*
1384 * Unlink the whole destination list
1385 */
1386 list_for_each_entry_safe(dest, nxt, &svc->destinations, n_list) {
1387 __ip_vs_unlink_dest(svc, dest, 0);
1388 __ip_vs_del_dest(svc->net, dest);
1389 }
1390
1391 /*
1392 * Update the virtual service counters
1393 */
1394 if (svc->port == FTPPORT)
1395 atomic_dec(&ipvs->ftpsvc_counter);
1396 else if (svc->port == 0)
1397 atomic_dec(&ipvs->nullsvc_counter);
1398
1399 /*
1400 * Free the service if nobody refers to it
1401 */
1402 if (atomic_read(&svc->refcnt) == 0) {
1403 IP_VS_DBG_BUF(3, "Removing service %u/%s:%u usecnt=%d\n",
1404 svc->fwmark,
1405 IP_VS_DBG_ADDR(svc->af, &svc->addr),
1406 ntohs(svc->port), atomic_read(&svc->usecnt));
1407 free_percpu(svc->stats.cpustats);
1408 kfree(svc);
1409 }
1410
1411 /* decrease the module use count */
1412 ip_vs_use_count_dec();
1413 }
1414
1415 /*
1416 * Unlink a service from list and try to delete it if its refcnt reached 0
1417 */
ip_vs_unlink_service(struct ip_vs_service * svc)1418 static void ip_vs_unlink_service(struct ip_vs_service *svc)
1419 {
1420 /*
1421 * Unhash it from the service table
1422 */
1423 write_lock_bh(&__ip_vs_svc_lock);
1424
1425 ip_vs_svc_unhash(svc);
1426
1427 /*
1428 * Wait until all the svc users go away.
1429 */
1430 IP_VS_WAIT_WHILE(atomic_read(&svc->usecnt) > 0);
1431
1432 __ip_vs_del_service(svc);
1433
1434 write_unlock_bh(&__ip_vs_svc_lock);
1435 }
1436
1437 /*
1438 * Delete a service from the service list
1439 */
ip_vs_del_service(struct ip_vs_service * svc)1440 static int ip_vs_del_service(struct ip_vs_service *svc)
1441 {
1442 if (svc == NULL)
1443 return -EEXIST;
1444 ip_vs_unlink_service(svc);
1445
1446 return 0;
1447 }
1448
1449
1450 /*
1451 * Flush all the virtual services
1452 */
ip_vs_flush(struct net * net)1453 static int ip_vs_flush(struct net *net)
1454 {
1455 int idx;
1456 struct ip_vs_service *svc, *nxt;
1457
1458 /*
1459 * Flush the service table hashed by <netns,protocol,addr,port>
1460 */
1461 for(idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
1462 list_for_each_entry_safe(svc, nxt, &ip_vs_svc_table[idx],
1463 s_list) {
1464 if (net_eq(svc->net, net))
1465 ip_vs_unlink_service(svc);
1466 }
1467 }
1468
1469 /*
1470 * Flush the service table hashed by fwmark
1471 */
1472 for(idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
1473 list_for_each_entry_safe(svc, nxt,
1474 &ip_vs_svc_fwm_table[idx], f_list) {
1475 if (net_eq(svc->net, net))
1476 ip_vs_unlink_service(svc);
1477 }
1478 }
1479
1480 return 0;
1481 }
1482
1483 /*
1484 * Delete service by {netns} in the service table.
1485 * Called by __ip_vs_cleanup()
1486 */
ip_vs_service_net_cleanup(struct net * net)1487 void ip_vs_service_net_cleanup(struct net *net)
1488 {
1489 EnterFunction(2);
1490 /* Check for "full" addressed entries */
1491 mutex_lock(&__ip_vs_mutex);
1492 ip_vs_flush(net);
1493 mutex_unlock(&__ip_vs_mutex);
1494 LeaveFunction(2);
1495 }
1496 /*
1497 * Release dst hold by dst_cache
1498 */
1499 static inline void
__ip_vs_dev_reset(struct ip_vs_dest * dest,struct net_device * dev)1500 __ip_vs_dev_reset(struct ip_vs_dest *dest, struct net_device *dev)
1501 {
1502 spin_lock_bh(&dest->dst_lock);
1503 if (dest->dst_cache && dest->dst_cache->dev == dev) {
1504 IP_VS_DBG_BUF(3, "Reset dev:%s dest %s:%u ,dest->refcnt=%d\n",
1505 dev->name,
1506 IP_VS_DBG_ADDR(dest->af, &dest->addr),
1507 ntohs(dest->port),
1508 atomic_read(&dest->refcnt));
1509 ip_vs_dst_reset(dest);
1510 }
1511 spin_unlock_bh(&dest->dst_lock);
1512
1513 }
1514 /*
1515 * Netdev event receiver
1516 * Currently only NETDEV_UNREGISTER is handled, i.e. if we hold a reference to
1517 * a device that is "unregister" it must be released.
1518 */
ip_vs_dst_event(struct notifier_block * this,unsigned long event,void * ptr)1519 static int ip_vs_dst_event(struct notifier_block *this, unsigned long event,
1520 void *ptr)
1521 {
1522 struct net_device *dev = ptr;
1523 struct net *net = dev_net(dev);
1524 struct ip_vs_service *svc;
1525 struct ip_vs_dest *dest;
1526 unsigned int idx;
1527
1528 if (event != NETDEV_UNREGISTER)
1529 return NOTIFY_DONE;
1530 IP_VS_DBG(3, "%s() dev=%s\n", __func__, dev->name);
1531 EnterFunction(2);
1532 mutex_lock(&__ip_vs_mutex);
1533 for (idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
1534 list_for_each_entry(svc, &ip_vs_svc_table[idx], s_list) {
1535 if (net_eq(svc->net, net)) {
1536 list_for_each_entry(dest, &svc->destinations,
1537 n_list) {
1538 __ip_vs_dev_reset(dest, dev);
1539 }
1540 }
1541 }
1542
1543 list_for_each_entry(svc, &ip_vs_svc_fwm_table[idx], f_list) {
1544 if (net_eq(svc->net, net)) {
1545 list_for_each_entry(dest, &svc->destinations,
1546 n_list) {
1547 __ip_vs_dev_reset(dest, dev);
1548 }
1549 }
1550
1551 }
1552 }
1553
1554 list_for_each_entry(dest, &net_ipvs(net)->dest_trash, n_list) {
1555 __ip_vs_dev_reset(dest, dev);
1556 }
1557 mutex_unlock(&__ip_vs_mutex);
1558 LeaveFunction(2);
1559 return NOTIFY_DONE;
1560 }
1561
1562 /*
1563 * Zero counters in a service or all services
1564 */
ip_vs_zero_service(struct ip_vs_service * svc)1565 static int ip_vs_zero_service(struct ip_vs_service *svc)
1566 {
1567 struct ip_vs_dest *dest;
1568
1569 write_lock_bh(&__ip_vs_svc_lock);
1570 list_for_each_entry(dest, &svc->destinations, n_list) {
1571 ip_vs_zero_stats(&dest->stats);
1572 }
1573 ip_vs_zero_stats(&svc->stats);
1574 write_unlock_bh(&__ip_vs_svc_lock);
1575 return 0;
1576 }
1577
ip_vs_zero_all(struct net * net)1578 static int ip_vs_zero_all(struct net *net)
1579 {
1580 int idx;
1581 struct ip_vs_service *svc;
1582
1583 for(idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
1584 list_for_each_entry(svc, &ip_vs_svc_table[idx], s_list) {
1585 if (net_eq(svc->net, net))
1586 ip_vs_zero_service(svc);
1587 }
1588 }
1589
1590 for(idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
1591 list_for_each_entry(svc, &ip_vs_svc_fwm_table[idx], f_list) {
1592 if (net_eq(svc->net, net))
1593 ip_vs_zero_service(svc);
1594 }
1595 }
1596
1597 ip_vs_zero_stats(&net_ipvs(net)->tot_stats);
1598 return 0;
1599 }
1600
1601 #ifdef CONFIG_SYSCTL
1602 static int
proc_do_defense_mode(ctl_table * table,int write,void __user * buffer,size_t * lenp,loff_t * ppos)1603 proc_do_defense_mode(ctl_table *table, int write,
1604 void __user *buffer, size_t *lenp, loff_t *ppos)
1605 {
1606 struct net *net = current->nsproxy->net_ns;
1607 int *valp = table->data;
1608 int val = *valp;
1609 int rc;
1610
1611 rc = proc_dointvec(table, write, buffer, lenp, ppos);
1612 if (write && (*valp != val)) {
1613 if ((*valp < 0) || (*valp > 3)) {
1614 /* Restore the correct value */
1615 *valp = val;
1616 } else {
1617 update_defense_level(net_ipvs(net));
1618 }
1619 }
1620 return rc;
1621 }
1622
1623 static int
proc_do_sync_threshold(ctl_table * table,int write,void __user * buffer,size_t * lenp,loff_t * ppos)1624 proc_do_sync_threshold(ctl_table *table, int write,
1625 void __user *buffer, size_t *lenp, loff_t *ppos)
1626 {
1627 int *valp = table->data;
1628 int val[2];
1629 int rc;
1630
1631 /* backup the value first */
1632 memcpy(val, valp, sizeof(val));
1633
1634 rc = proc_dointvec(table, write, buffer, lenp, ppos);
1635 if (write && (valp[0] < 0 || valp[1] < 0 || valp[0] >= valp[1])) {
1636 /* Restore the correct value */
1637 memcpy(valp, val, sizeof(val));
1638 }
1639 return rc;
1640 }
1641
1642 static int
proc_do_sync_mode(ctl_table * table,int write,void __user * buffer,size_t * lenp,loff_t * ppos)1643 proc_do_sync_mode(ctl_table *table, int write,
1644 void __user *buffer, size_t *lenp, loff_t *ppos)
1645 {
1646 int *valp = table->data;
1647 int val = *valp;
1648 int rc;
1649
1650 rc = proc_dointvec(table, write, buffer, lenp, ppos);
1651 if (write && (*valp != val)) {
1652 if ((*valp < 0) || (*valp > 1)) {
1653 /* Restore the correct value */
1654 *valp = val;
1655 } else {
1656 struct net *net = current->nsproxy->net_ns;
1657 ip_vs_sync_switch_mode(net, val);
1658 }
1659 }
1660 return rc;
1661 }
1662
1663 /*
1664 * IPVS sysctl table (under the /proc/sys/net/ipv4/vs/)
1665 * Do not change order or insert new entries without
1666 * align with netns init in ip_vs_control_net_init()
1667 */
1668
1669 static struct ctl_table vs_vars[] = {
1670 {
1671 .procname = "amemthresh",
1672 .maxlen = sizeof(int),
1673 .mode = 0644,
1674 .proc_handler = proc_dointvec,
1675 },
1676 {
1677 .procname = "am_droprate",
1678 .maxlen = sizeof(int),
1679 .mode = 0644,
1680 .proc_handler = proc_dointvec,
1681 },
1682 {
1683 .procname = "drop_entry",
1684 .maxlen = sizeof(int),
1685 .mode = 0644,
1686 .proc_handler = proc_do_defense_mode,
1687 },
1688 {
1689 .procname = "drop_packet",
1690 .maxlen = sizeof(int),
1691 .mode = 0644,
1692 .proc_handler = proc_do_defense_mode,
1693 },
1694 #ifdef CONFIG_IP_VS_NFCT
1695 {
1696 .procname = "conntrack",
1697 .maxlen = sizeof(int),
1698 .mode = 0644,
1699 .proc_handler = &proc_dointvec,
1700 },
1701 #endif
1702 {
1703 .procname = "secure_tcp",
1704 .maxlen = sizeof(int),
1705 .mode = 0644,
1706 .proc_handler = proc_do_defense_mode,
1707 },
1708 {
1709 .procname = "snat_reroute",
1710 .maxlen = sizeof(int),
1711 .mode = 0644,
1712 .proc_handler = &proc_dointvec,
1713 },
1714 {
1715 .procname = "sync_version",
1716 .maxlen = sizeof(int),
1717 .mode = 0644,
1718 .proc_handler = &proc_do_sync_mode,
1719 },
1720 {
1721 .procname = "cache_bypass",
1722 .maxlen = sizeof(int),
1723 .mode = 0644,
1724 .proc_handler = proc_dointvec,
1725 },
1726 {
1727 .procname = "expire_nodest_conn",
1728 .maxlen = sizeof(int),
1729 .mode = 0644,
1730 .proc_handler = proc_dointvec,
1731 },
1732 {
1733 .procname = "expire_quiescent_template",
1734 .maxlen = sizeof(int),
1735 .mode = 0644,
1736 .proc_handler = proc_dointvec,
1737 },
1738 {
1739 .procname = "sync_threshold",
1740 .maxlen =
1741 sizeof(((struct netns_ipvs *)0)->sysctl_sync_threshold),
1742 .mode = 0644,
1743 .proc_handler = proc_do_sync_threshold,
1744 },
1745 {
1746 .procname = "nat_icmp_send",
1747 .maxlen = sizeof(int),
1748 .mode = 0644,
1749 .proc_handler = proc_dointvec,
1750 },
1751 #ifdef CONFIG_IP_VS_DEBUG
1752 {
1753 .procname = "debug_level",
1754 .data = &sysctl_ip_vs_debug_level,
1755 .maxlen = sizeof(int),
1756 .mode = 0644,
1757 .proc_handler = proc_dointvec,
1758 },
1759 #endif
1760 #if 0
1761 {
1762 .procname = "timeout_established",
1763 .data = &vs_timeout_table_dos.timeout[IP_VS_S_ESTABLISHED],
1764 .maxlen = sizeof(int),
1765 .mode = 0644,
1766 .proc_handler = proc_dointvec_jiffies,
1767 },
1768 {
1769 .procname = "timeout_synsent",
1770 .data = &vs_timeout_table_dos.timeout[IP_VS_S_SYN_SENT],
1771 .maxlen = sizeof(int),
1772 .mode = 0644,
1773 .proc_handler = proc_dointvec_jiffies,
1774 },
1775 {
1776 .procname = "timeout_synrecv",
1777 .data = &vs_timeout_table_dos.timeout[IP_VS_S_SYN_RECV],
1778 .maxlen = sizeof(int),
1779 .mode = 0644,
1780 .proc_handler = proc_dointvec_jiffies,
1781 },
1782 {
1783 .procname = "timeout_finwait",
1784 .data = &vs_timeout_table_dos.timeout[IP_VS_S_FIN_WAIT],
1785 .maxlen = sizeof(int),
1786 .mode = 0644,
1787 .proc_handler = proc_dointvec_jiffies,
1788 },
1789 {
1790 .procname = "timeout_timewait",
1791 .data = &vs_timeout_table_dos.timeout[IP_VS_S_TIME_WAIT],
1792 .maxlen = sizeof(int),
1793 .mode = 0644,
1794 .proc_handler = proc_dointvec_jiffies,
1795 },
1796 {
1797 .procname = "timeout_close",
1798 .data = &vs_timeout_table_dos.timeout[IP_VS_S_CLOSE],
1799 .maxlen = sizeof(int),
1800 .mode = 0644,
1801 .proc_handler = proc_dointvec_jiffies,
1802 },
1803 {
1804 .procname = "timeout_closewait",
1805 .data = &vs_timeout_table_dos.timeout[IP_VS_S_CLOSE_WAIT],
1806 .maxlen = sizeof(int),
1807 .mode = 0644,
1808 .proc_handler = proc_dointvec_jiffies,
1809 },
1810 {
1811 .procname = "timeout_lastack",
1812 .data = &vs_timeout_table_dos.timeout[IP_VS_S_LAST_ACK],
1813 .maxlen = sizeof(int),
1814 .mode = 0644,
1815 .proc_handler = proc_dointvec_jiffies,
1816 },
1817 {
1818 .procname = "timeout_listen",
1819 .data = &vs_timeout_table_dos.timeout[IP_VS_S_LISTEN],
1820 .maxlen = sizeof(int),
1821 .mode = 0644,
1822 .proc_handler = proc_dointvec_jiffies,
1823 },
1824 {
1825 .procname = "timeout_synack",
1826 .data = &vs_timeout_table_dos.timeout[IP_VS_S_SYNACK],
1827 .maxlen = sizeof(int),
1828 .mode = 0644,
1829 .proc_handler = proc_dointvec_jiffies,
1830 },
1831 {
1832 .procname = "timeout_udp",
1833 .data = &vs_timeout_table_dos.timeout[IP_VS_S_UDP],
1834 .maxlen = sizeof(int),
1835 .mode = 0644,
1836 .proc_handler = proc_dointvec_jiffies,
1837 },
1838 {
1839 .procname = "timeout_icmp",
1840 .data = &vs_timeout_table_dos.timeout[IP_VS_S_ICMP],
1841 .maxlen = sizeof(int),
1842 .mode = 0644,
1843 .proc_handler = proc_dointvec_jiffies,
1844 },
1845 #endif
1846 { }
1847 };
1848
1849 const struct ctl_path net_vs_ctl_path[] = {
1850 { .procname = "net", },
1851 { .procname = "ipv4", },
1852 { .procname = "vs", },
1853 { }
1854 };
1855 EXPORT_SYMBOL_GPL(net_vs_ctl_path);
1856 #endif
1857
1858 #ifdef CONFIG_PROC_FS
1859
1860 struct ip_vs_iter {
1861 struct seq_net_private p; /* Do not move this, netns depends upon it*/
1862 struct list_head *table;
1863 int bucket;
1864 };
1865
1866 /*
1867 * Write the contents of the VS rule table to a PROCfs file.
1868 * (It is kept just for backward compatibility)
1869 */
ip_vs_fwd_name(unsigned flags)1870 static inline const char *ip_vs_fwd_name(unsigned flags)
1871 {
1872 switch (flags & IP_VS_CONN_F_FWD_MASK) {
1873 case IP_VS_CONN_F_LOCALNODE:
1874 return "Local";
1875 case IP_VS_CONN_F_TUNNEL:
1876 return "Tunnel";
1877 case IP_VS_CONN_F_DROUTE:
1878 return "Route";
1879 default:
1880 return "Masq";
1881 }
1882 }
1883
1884
1885 /* Get the Nth entry in the two lists */
ip_vs_info_array(struct seq_file * seq,loff_t pos)1886 static struct ip_vs_service *ip_vs_info_array(struct seq_file *seq, loff_t pos)
1887 {
1888 struct net *net = seq_file_net(seq);
1889 struct ip_vs_iter *iter = seq->private;
1890 int idx;
1891 struct ip_vs_service *svc;
1892
1893 /* look in hash by protocol */
1894 for (idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
1895 list_for_each_entry(svc, &ip_vs_svc_table[idx], s_list) {
1896 if (net_eq(svc->net, net) && pos-- == 0) {
1897 iter->table = ip_vs_svc_table;
1898 iter->bucket = idx;
1899 return svc;
1900 }
1901 }
1902 }
1903
1904 /* keep looking in fwmark */
1905 for (idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
1906 list_for_each_entry(svc, &ip_vs_svc_fwm_table[idx], f_list) {
1907 if (net_eq(svc->net, net) && pos-- == 0) {
1908 iter->table = ip_vs_svc_fwm_table;
1909 iter->bucket = idx;
1910 return svc;
1911 }
1912 }
1913 }
1914
1915 return NULL;
1916 }
1917
ip_vs_info_seq_start(struct seq_file * seq,loff_t * pos)1918 static void *ip_vs_info_seq_start(struct seq_file *seq, loff_t *pos)
1919 __acquires(__ip_vs_svc_lock)
1920 {
1921
1922 read_lock_bh(&__ip_vs_svc_lock);
1923 return *pos ? ip_vs_info_array(seq, *pos - 1) : SEQ_START_TOKEN;
1924 }
1925
1926
ip_vs_info_seq_next(struct seq_file * seq,void * v,loff_t * pos)1927 static void *ip_vs_info_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1928 {
1929 struct list_head *e;
1930 struct ip_vs_iter *iter;
1931 struct ip_vs_service *svc;
1932
1933 ++*pos;
1934 if (v == SEQ_START_TOKEN)
1935 return ip_vs_info_array(seq,0);
1936
1937 svc = v;
1938 iter = seq->private;
1939
1940 if (iter->table == ip_vs_svc_table) {
1941 /* next service in table hashed by protocol */
1942 if ((e = svc->s_list.next) != &ip_vs_svc_table[iter->bucket])
1943 return list_entry(e, struct ip_vs_service, s_list);
1944
1945
1946 while (++iter->bucket < IP_VS_SVC_TAB_SIZE) {
1947 list_for_each_entry(svc,&ip_vs_svc_table[iter->bucket],
1948 s_list) {
1949 return svc;
1950 }
1951 }
1952
1953 iter->table = ip_vs_svc_fwm_table;
1954 iter->bucket = -1;
1955 goto scan_fwmark;
1956 }
1957
1958 /* next service in hashed by fwmark */
1959 if ((e = svc->f_list.next) != &ip_vs_svc_fwm_table[iter->bucket])
1960 return list_entry(e, struct ip_vs_service, f_list);
1961
1962 scan_fwmark:
1963 while (++iter->bucket < IP_VS_SVC_TAB_SIZE) {
1964 list_for_each_entry(svc, &ip_vs_svc_fwm_table[iter->bucket],
1965 f_list)
1966 return svc;
1967 }
1968
1969 return NULL;
1970 }
1971
ip_vs_info_seq_stop(struct seq_file * seq,void * v)1972 static void ip_vs_info_seq_stop(struct seq_file *seq, void *v)
1973 __releases(__ip_vs_svc_lock)
1974 {
1975 read_unlock_bh(&__ip_vs_svc_lock);
1976 }
1977
1978
ip_vs_info_seq_show(struct seq_file * seq,void * v)1979 static int ip_vs_info_seq_show(struct seq_file *seq, void *v)
1980 {
1981 if (v == SEQ_START_TOKEN) {
1982 seq_printf(seq,
1983 "IP Virtual Server version %d.%d.%d (size=%d)\n",
1984 NVERSION(IP_VS_VERSION_CODE), ip_vs_conn_tab_size);
1985 seq_puts(seq,
1986 "Prot LocalAddress:Port Scheduler Flags\n");
1987 seq_puts(seq,
1988 " -> RemoteAddress:Port Forward Weight ActiveConn InActConn\n");
1989 } else {
1990 const struct ip_vs_service *svc = v;
1991 const struct ip_vs_iter *iter = seq->private;
1992 const struct ip_vs_dest *dest;
1993
1994 if (iter->table == ip_vs_svc_table) {
1995 #ifdef CONFIG_IP_VS_IPV6
1996 if (svc->af == AF_INET6)
1997 seq_printf(seq, "%s [%pI6]:%04X %s ",
1998 ip_vs_proto_name(svc->protocol),
1999 &svc->addr.in6,
2000 ntohs(svc->port),
2001 svc->scheduler->name);
2002 else
2003 #endif
2004 seq_printf(seq, "%s %08X:%04X %s %s ",
2005 ip_vs_proto_name(svc->protocol),
2006 ntohl(svc->addr.ip),
2007 ntohs(svc->port),
2008 svc->scheduler->name,
2009 (svc->flags & IP_VS_SVC_F_ONEPACKET)?"ops ":"");
2010 } else {
2011 seq_printf(seq, "FWM %08X %s %s",
2012 svc->fwmark, svc->scheduler->name,
2013 (svc->flags & IP_VS_SVC_F_ONEPACKET)?"ops ":"");
2014 }
2015
2016 if (svc->flags & IP_VS_SVC_F_PERSISTENT)
2017 seq_printf(seq, "persistent %d %08X\n",
2018 svc->timeout,
2019 ntohl(svc->netmask));
2020 else
2021 seq_putc(seq, '\n');
2022
2023 list_for_each_entry(dest, &svc->destinations, n_list) {
2024 #ifdef CONFIG_IP_VS_IPV6
2025 if (dest->af == AF_INET6)
2026 seq_printf(seq,
2027 " -> [%pI6]:%04X"
2028 " %-7s %-6d %-10d %-10d\n",
2029 &dest->addr.in6,
2030 ntohs(dest->port),
2031 ip_vs_fwd_name(atomic_read(&dest->conn_flags)),
2032 atomic_read(&dest->weight),
2033 atomic_read(&dest->activeconns),
2034 atomic_read(&dest->inactconns));
2035 else
2036 #endif
2037 seq_printf(seq,
2038 " -> %08X:%04X "
2039 "%-7s %-6d %-10d %-10d\n",
2040 ntohl(dest->addr.ip),
2041 ntohs(dest->port),
2042 ip_vs_fwd_name(atomic_read(&dest->conn_flags)),
2043 atomic_read(&dest->weight),
2044 atomic_read(&dest->activeconns),
2045 atomic_read(&dest->inactconns));
2046
2047 }
2048 }
2049 return 0;
2050 }
2051
2052 static const struct seq_operations ip_vs_info_seq_ops = {
2053 .start = ip_vs_info_seq_start,
2054 .next = ip_vs_info_seq_next,
2055 .stop = ip_vs_info_seq_stop,
2056 .show = ip_vs_info_seq_show,
2057 };
2058
ip_vs_info_open(struct inode * inode,struct file * file)2059 static int ip_vs_info_open(struct inode *inode, struct file *file)
2060 {
2061 return seq_open_net(inode, file, &ip_vs_info_seq_ops,
2062 sizeof(struct ip_vs_iter));
2063 }
2064
2065 static const struct file_operations ip_vs_info_fops = {
2066 .owner = THIS_MODULE,
2067 .open = ip_vs_info_open,
2068 .read = seq_read,
2069 .llseek = seq_lseek,
2070 .release = seq_release_net,
2071 };
2072
ip_vs_stats_show(struct seq_file * seq,void * v)2073 static int ip_vs_stats_show(struct seq_file *seq, void *v)
2074 {
2075 struct net *net = seq_file_single_net(seq);
2076 struct ip_vs_stats_user show;
2077
2078 /* 01234567 01234567 01234567 0123456701234567 0123456701234567 */
2079 seq_puts(seq,
2080 " Total Incoming Outgoing Incoming Outgoing\n");
2081 seq_printf(seq,
2082 " Conns Packets Packets Bytes Bytes\n");
2083
2084 ip_vs_copy_stats(&show, &net_ipvs(net)->tot_stats);
2085 seq_printf(seq, "%8X %8X %8X %16LX %16LX\n\n", show.conns,
2086 show.inpkts, show.outpkts,
2087 (unsigned long long) show.inbytes,
2088 (unsigned long long) show.outbytes);
2089
2090 /* 01234567 01234567 01234567 0123456701234567 0123456701234567 */
2091 seq_puts(seq,
2092 " Conns/s Pkts/s Pkts/s Bytes/s Bytes/s\n");
2093 seq_printf(seq, "%8X %8X %8X %16X %16X\n",
2094 show.cps, show.inpps, show.outpps,
2095 show.inbps, show.outbps);
2096
2097 return 0;
2098 }
2099
ip_vs_stats_seq_open(struct inode * inode,struct file * file)2100 static int ip_vs_stats_seq_open(struct inode *inode, struct file *file)
2101 {
2102 return single_open_net(inode, file, ip_vs_stats_show);
2103 }
2104
2105 static const struct file_operations ip_vs_stats_fops = {
2106 .owner = THIS_MODULE,
2107 .open = ip_vs_stats_seq_open,
2108 .read = seq_read,
2109 .llseek = seq_lseek,
2110 .release = single_release_net,
2111 };
2112
ip_vs_stats_percpu_show(struct seq_file * seq,void * v)2113 static int ip_vs_stats_percpu_show(struct seq_file *seq, void *v)
2114 {
2115 struct net *net = seq_file_single_net(seq);
2116 struct ip_vs_stats *tot_stats = &net_ipvs(net)->tot_stats;
2117 struct ip_vs_cpu_stats *cpustats = tot_stats->cpustats;
2118 struct ip_vs_stats_user rates;
2119 int i;
2120
2121 /* 01234567 01234567 01234567 0123456701234567 0123456701234567 */
2122 seq_puts(seq,
2123 " Total Incoming Outgoing Incoming Outgoing\n");
2124 seq_printf(seq,
2125 "CPU Conns Packets Packets Bytes Bytes\n");
2126
2127 for_each_possible_cpu(i) {
2128 struct ip_vs_cpu_stats *u = per_cpu_ptr(cpustats, i);
2129 unsigned int start;
2130 __u64 inbytes, outbytes;
2131
2132 do {
2133 start = u64_stats_fetch_begin_bh(&u->syncp);
2134 inbytes = u->ustats.inbytes;
2135 outbytes = u->ustats.outbytes;
2136 } while (u64_stats_fetch_retry_bh(&u->syncp, start));
2137
2138 seq_printf(seq, "%3X %8X %8X %8X %16LX %16LX\n",
2139 i, u->ustats.conns, u->ustats.inpkts,
2140 u->ustats.outpkts, (__u64)inbytes,
2141 (__u64)outbytes);
2142 }
2143
2144 spin_lock_bh(&tot_stats->lock);
2145
2146 seq_printf(seq, " ~ %8X %8X %8X %16LX %16LX\n\n",
2147 tot_stats->ustats.conns, tot_stats->ustats.inpkts,
2148 tot_stats->ustats.outpkts,
2149 (unsigned long long) tot_stats->ustats.inbytes,
2150 (unsigned long long) tot_stats->ustats.outbytes);
2151
2152 ip_vs_read_estimator(&rates, tot_stats);
2153
2154 spin_unlock_bh(&tot_stats->lock);
2155
2156 /* 01234567 01234567 01234567 0123456701234567 0123456701234567 */
2157 seq_puts(seq,
2158 " Conns/s Pkts/s Pkts/s Bytes/s Bytes/s\n");
2159 seq_printf(seq, " %8X %8X %8X %16X %16X\n",
2160 rates.cps,
2161 rates.inpps,
2162 rates.outpps,
2163 rates.inbps,
2164 rates.outbps);
2165
2166 return 0;
2167 }
2168
ip_vs_stats_percpu_seq_open(struct inode * inode,struct file * file)2169 static int ip_vs_stats_percpu_seq_open(struct inode *inode, struct file *file)
2170 {
2171 return single_open_net(inode, file, ip_vs_stats_percpu_show);
2172 }
2173
2174 static const struct file_operations ip_vs_stats_percpu_fops = {
2175 .owner = THIS_MODULE,
2176 .open = ip_vs_stats_percpu_seq_open,
2177 .read = seq_read,
2178 .llseek = seq_lseek,
2179 .release = single_release_net,
2180 };
2181 #endif
2182
2183 /*
2184 * Set timeout values for tcp tcpfin udp in the timeout_table.
2185 */
ip_vs_set_timeout(struct net * net,struct ip_vs_timeout_user * u)2186 static int ip_vs_set_timeout(struct net *net, struct ip_vs_timeout_user *u)
2187 {
2188 #if defined(CONFIG_IP_VS_PROTO_TCP) || defined(CONFIG_IP_VS_PROTO_UDP)
2189 struct ip_vs_proto_data *pd;
2190 #endif
2191
2192 IP_VS_DBG(2, "Setting timeout tcp:%d tcpfin:%d udp:%d\n",
2193 u->tcp_timeout,
2194 u->tcp_fin_timeout,
2195 u->udp_timeout);
2196
2197 #ifdef CONFIG_IP_VS_PROTO_TCP
2198 if (u->tcp_timeout) {
2199 pd = ip_vs_proto_data_get(net, IPPROTO_TCP);
2200 pd->timeout_table[IP_VS_TCP_S_ESTABLISHED]
2201 = u->tcp_timeout * HZ;
2202 }
2203
2204 if (u->tcp_fin_timeout) {
2205 pd = ip_vs_proto_data_get(net, IPPROTO_TCP);
2206 pd->timeout_table[IP_VS_TCP_S_FIN_WAIT]
2207 = u->tcp_fin_timeout * HZ;
2208 }
2209 #endif
2210
2211 #ifdef CONFIG_IP_VS_PROTO_UDP
2212 if (u->udp_timeout) {
2213 pd = ip_vs_proto_data_get(net, IPPROTO_UDP);
2214 pd->timeout_table[IP_VS_UDP_S_NORMAL]
2215 = u->udp_timeout * HZ;
2216 }
2217 #endif
2218 return 0;
2219 }
2220
2221
2222 #define SET_CMDID(cmd) (cmd - IP_VS_BASE_CTL)
2223 #define SERVICE_ARG_LEN (sizeof(struct ip_vs_service_user))
2224 #define SVCDEST_ARG_LEN (sizeof(struct ip_vs_service_user) + \
2225 sizeof(struct ip_vs_dest_user))
2226 #define TIMEOUT_ARG_LEN (sizeof(struct ip_vs_timeout_user))
2227 #define DAEMON_ARG_LEN (sizeof(struct ip_vs_daemon_user))
2228 #define MAX_ARG_LEN SVCDEST_ARG_LEN
2229
2230 static const unsigned char set_arglen[SET_CMDID(IP_VS_SO_SET_MAX)+1] = {
2231 [SET_CMDID(IP_VS_SO_SET_ADD)] = SERVICE_ARG_LEN,
2232 [SET_CMDID(IP_VS_SO_SET_EDIT)] = SERVICE_ARG_LEN,
2233 [SET_CMDID(IP_VS_SO_SET_DEL)] = SERVICE_ARG_LEN,
2234 [SET_CMDID(IP_VS_SO_SET_FLUSH)] = 0,
2235 [SET_CMDID(IP_VS_SO_SET_ADDDEST)] = SVCDEST_ARG_LEN,
2236 [SET_CMDID(IP_VS_SO_SET_DELDEST)] = SVCDEST_ARG_LEN,
2237 [SET_CMDID(IP_VS_SO_SET_EDITDEST)] = SVCDEST_ARG_LEN,
2238 [SET_CMDID(IP_VS_SO_SET_TIMEOUT)] = TIMEOUT_ARG_LEN,
2239 [SET_CMDID(IP_VS_SO_SET_STARTDAEMON)] = DAEMON_ARG_LEN,
2240 [SET_CMDID(IP_VS_SO_SET_STOPDAEMON)] = DAEMON_ARG_LEN,
2241 [SET_CMDID(IP_VS_SO_SET_ZERO)] = SERVICE_ARG_LEN,
2242 };
2243
ip_vs_copy_usvc_compat(struct ip_vs_service_user_kern * usvc,struct ip_vs_service_user * usvc_compat)2244 static void ip_vs_copy_usvc_compat(struct ip_vs_service_user_kern *usvc,
2245 struct ip_vs_service_user *usvc_compat)
2246 {
2247 memset(usvc, 0, sizeof(*usvc));
2248
2249 usvc->af = AF_INET;
2250 usvc->protocol = usvc_compat->protocol;
2251 usvc->addr.ip = usvc_compat->addr;
2252 usvc->port = usvc_compat->port;
2253 usvc->fwmark = usvc_compat->fwmark;
2254
2255 /* Deep copy of sched_name is not needed here */
2256 usvc->sched_name = usvc_compat->sched_name;
2257
2258 usvc->flags = usvc_compat->flags;
2259 usvc->timeout = usvc_compat->timeout;
2260 usvc->netmask = usvc_compat->netmask;
2261 }
2262
ip_vs_copy_udest_compat(struct ip_vs_dest_user_kern * udest,struct ip_vs_dest_user * udest_compat)2263 static void ip_vs_copy_udest_compat(struct ip_vs_dest_user_kern *udest,
2264 struct ip_vs_dest_user *udest_compat)
2265 {
2266 memset(udest, 0, sizeof(*udest));
2267
2268 udest->addr.ip = udest_compat->addr;
2269 udest->port = udest_compat->port;
2270 udest->conn_flags = udest_compat->conn_flags;
2271 udest->weight = udest_compat->weight;
2272 udest->u_threshold = udest_compat->u_threshold;
2273 udest->l_threshold = udest_compat->l_threshold;
2274 }
2275
2276 static int
do_ip_vs_set_ctl(struct sock * sk,int cmd,void __user * user,unsigned int len)2277 do_ip_vs_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len)
2278 {
2279 struct net *net = sock_net(sk);
2280 int ret;
2281 unsigned char arg[MAX_ARG_LEN];
2282 struct ip_vs_service_user *usvc_compat;
2283 struct ip_vs_service_user_kern usvc;
2284 struct ip_vs_service *svc;
2285 struct ip_vs_dest_user *udest_compat;
2286 struct ip_vs_dest_user_kern udest;
2287 struct netns_ipvs *ipvs = net_ipvs(net);
2288
2289 if (!capable(CAP_NET_ADMIN))
2290 return -EPERM;
2291
2292 if (cmd < IP_VS_BASE_CTL || cmd > IP_VS_SO_SET_MAX)
2293 return -EINVAL;
2294 if (len < 0 || len > MAX_ARG_LEN)
2295 return -EINVAL;
2296 if (len != set_arglen[SET_CMDID(cmd)]) {
2297 pr_err("set_ctl: len %u != %u\n",
2298 len, set_arglen[SET_CMDID(cmd)]);
2299 return -EINVAL;
2300 }
2301
2302 if (copy_from_user(arg, user, len) != 0)
2303 return -EFAULT;
2304
2305 /* increase the module use count */
2306 ip_vs_use_count_inc();
2307
2308 /* Handle daemons since they have another lock */
2309 if (cmd == IP_VS_SO_SET_STARTDAEMON ||
2310 cmd == IP_VS_SO_SET_STOPDAEMON) {
2311 struct ip_vs_daemon_user *dm = (struct ip_vs_daemon_user *)arg;
2312
2313 if (mutex_lock_interruptible(&ipvs->sync_mutex)) {
2314 ret = -ERESTARTSYS;
2315 goto out_dec;
2316 }
2317 if (cmd == IP_VS_SO_SET_STARTDAEMON)
2318 ret = start_sync_thread(net, dm->state, dm->mcast_ifn,
2319 dm->syncid);
2320 else
2321 ret = stop_sync_thread(net, dm->state);
2322 mutex_unlock(&ipvs->sync_mutex);
2323 goto out_dec;
2324 }
2325
2326 if (mutex_lock_interruptible(&__ip_vs_mutex)) {
2327 ret = -ERESTARTSYS;
2328 goto out_dec;
2329 }
2330
2331 if (cmd == IP_VS_SO_SET_FLUSH) {
2332 /* Flush the virtual service */
2333 ret = ip_vs_flush(net);
2334 goto out_unlock;
2335 } else if (cmd == IP_VS_SO_SET_TIMEOUT) {
2336 /* Set timeout values for (tcp tcpfin udp) */
2337 ret = ip_vs_set_timeout(net, (struct ip_vs_timeout_user *)arg);
2338 goto out_unlock;
2339 }
2340
2341 usvc_compat = (struct ip_vs_service_user *)arg;
2342 udest_compat = (struct ip_vs_dest_user *)(usvc_compat + 1);
2343
2344 /* We only use the new structs internally, so copy userspace compat
2345 * structs to extended internal versions */
2346 ip_vs_copy_usvc_compat(&usvc, usvc_compat);
2347 ip_vs_copy_udest_compat(&udest, udest_compat);
2348
2349 if (cmd == IP_VS_SO_SET_ZERO) {
2350 /* if no service address is set, zero counters in all */
2351 if (!usvc.fwmark && !usvc.addr.ip && !usvc.port) {
2352 ret = ip_vs_zero_all(net);
2353 goto out_unlock;
2354 }
2355 }
2356
2357 /* Check for valid protocol: TCP or UDP or SCTP, even for fwmark!=0 */
2358 if (usvc.protocol != IPPROTO_TCP && usvc.protocol != IPPROTO_UDP &&
2359 usvc.protocol != IPPROTO_SCTP) {
2360 pr_err("set_ctl: invalid protocol: %d %pI4:%d %s\n",
2361 usvc.protocol, &usvc.addr.ip,
2362 ntohs(usvc.port), usvc.sched_name);
2363 ret = -EFAULT;
2364 goto out_unlock;
2365 }
2366
2367 /* Lookup the exact service by <protocol, addr, port> or fwmark */
2368 if (usvc.fwmark == 0)
2369 svc = __ip_vs_service_find(net, usvc.af, usvc.protocol,
2370 &usvc.addr, usvc.port);
2371 else
2372 svc = __ip_vs_svc_fwm_find(net, usvc.af, usvc.fwmark);
2373
2374 if (cmd != IP_VS_SO_SET_ADD
2375 && (svc == NULL || svc->protocol != usvc.protocol)) {
2376 ret = -ESRCH;
2377 goto out_unlock;
2378 }
2379
2380 switch (cmd) {
2381 case IP_VS_SO_SET_ADD:
2382 if (svc != NULL)
2383 ret = -EEXIST;
2384 else
2385 ret = ip_vs_add_service(net, &usvc, &svc);
2386 break;
2387 case IP_VS_SO_SET_EDIT:
2388 ret = ip_vs_edit_service(svc, &usvc);
2389 break;
2390 case IP_VS_SO_SET_DEL:
2391 ret = ip_vs_del_service(svc);
2392 if (!ret)
2393 goto out_unlock;
2394 break;
2395 case IP_VS_SO_SET_ZERO:
2396 ret = ip_vs_zero_service(svc);
2397 break;
2398 case IP_VS_SO_SET_ADDDEST:
2399 ret = ip_vs_add_dest(svc, &udest);
2400 break;
2401 case IP_VS_SO_SET_EDITDEST:
2402 ret = ip_vs_edit_dest(svc, &udest);
2403 break;
2404 case IP_VS_SO_SET_DELDEST:
2405 ret = ip_vs_del_dest(svc, &udest);
2406 break;
2407 default:
2408 ret = -EINVAL;
2409 }
2410
2411 out_unlock:
2412 mutex_unlock(&__ip_vs_mutex);
2413 out_dec:
2414 /* decrease the module use count */
2415 ip_vs_use_count_dec();
2416
2417 return ret;
2418 }
2419
2420
2421 static void
ip_vs_copy_service(struct ip_vs_service_entry * dst,struct ip_vs_service * src)2422 ip_vs_copy_service(struct ip_vs_service_entry *dst, struct ip_vs_service *src)
2423 {
2424 dst->protocol = src->protocol;
2425 dst->addr = src->addr.ip;
2426 dst->port = src->port;
2427 dst->fwmark = src->fwmark;
2428 strlcpy(dst->sched_name, src->scheduler->name, sizeof(dst->sched_name));
2429 dst->flags = src->flags;
2430 dst->timeout = src->timeout / HZ;
2431 dst->netmask = src->netmask;
2432 dst->num_dests = src->num_dests;
2433 ip_vs_copy_stats(&dst->stats, &src->stats);
2434 }
2435
2436 static inline int
__ip_vs_get_service_entries(struct net * net,const struct ip_vs_get_services * get,struct ip_vs_get_services __user * uptr)2437 __ip_vs_get_service_entries(struct net *net,
2438 const struct ip_vs_get_services *get,
2439 struct ip_vs_get_services __user *uptr)
2440 {
2441 int idx, count=0;
2442 struct ip_vs_service *svc;
2443 struct ip_vs_service_entry entry;
2444 int ret = 0;
2445
2446 for (idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
2447 list_for_each_entry(svc, &ip_vs_svc_table[idx], s_list) {
2448 /* Only expose IPv4 entries to old interface */
2449 if (svc->af != AF_INET || !net_eq(svc->net, net))
2450 continue;
2451
2452 if (count >= get->num_services)
2453 goto out;
2454 memset(&entry, 0, sizeof(entry));
2455 ip_vs_copy_service(&entry, svc);
2456 if (copy_to_user(&uptr->entrytable[count],
2457 &entry, sizeof(entry))) {
2458 ret = -EFAULT;
2459 goto out;
2460 }
2461 count++;
2462 }
2463 }
2464
2465 for (idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
2466 list_for_each_entry(svc, &ip_vs_svc_fwm_table[idx], f_list) {
2467 /* Only expose IPv4 entries to old interface */
2468 if (svc->af != AF_INET || !net_eq(svc->net, net))
2469 continue;
2470
2471 if (count >= get->num_services)
2472 goto out;
2473 memset(&entry, 0, sizeof(entry));
2474 ip_vs_copy_service(&entry, svc);
2475 if (copy_to_user(&uptr->entrytable[count],
2476 &entry, sizeof(entry))) {
2477 ret = -EFAULT;
2478 goto out;
2479 }
2480 count++;
2481 }
2482 }
2483 out:
2484 return ret;
2485 }
2486
2487 static inline int
__ip_vs_get_dest_entries(struct net * net,const struct ip_vs_get_dests * get,struct ip_vs_get_dests __user * uptr)2488 __ip_vs_get_dest_entries(struct net *net, const struct ip_vs_get_dests *get,
2489 struct ip_vs_get_dests __user *uptr)
2490 {
2491 struct ip_vs_service *svc;
2492 union nf_inet_addr addr = { .ip = get->addr };
2493 int ret = 0;
2494
2495 if (get->fwmark)
2496 svc = __ip_vs_svc_fwm_find(net, AF_INET, get->fwmark);
2497 else
2498 svc = __ip_vs_service_find(net, AF_INET, get->protocol, &addr,
2499 get->port);
2500
2501 if (svc) {
2502 int count = 0;
2503 struct ip_vs_dest *dest;
2504 struct ip_vs_dest_entry entry;
2505
2506 list_for_each_entry(dest, &svc->destinations, n_list) {
2507 if (count >= get->num_dests)
2508 break;
2509
2510 entry.addr = dest->addr.ip;
2511 entry.port = dest->port;
2512 entry.conn_flags = atomic_read(&dest->conn_flags);
2513 entry.weight = atomic_read(&dest->weight);
2514 entry.u_threshold = dest->u_threshold;
2515 entry.l_threshold = dest->l_threshold;
2516 entry.activeconns = atomic_read(&dest->activeconns);
2517 entry.inactconns = atomic_read(&dest->inactconns);
2518 entry.persistconns = atomic_read(&dest->persistconns);
2519 ip_vs_copy_stats(&entry.stats, &dest->stats);
2520 if (copy_to_user(&uptr->entrytable[count],
2521 &entry, sizeof(entry))) {
2522 ret = -EFAULT;
2523 break;
2524 }
2525 count++;
2526 }
2527 } else
2528 ret = -ESRCH;
2529 return ret;
2530 }
2531
2532 static inline void
__ip_vs_get_timeouts(struct net * net,struct ip_vs_timeout_user * u)2533 __ip_vs_get_timeouts(struct net *net, struct ip_vs_timeout_user *u)
2534 {
2535 #if defined(CONFIG_IP_VS_PROTO_TCP) || defined(CONFIG_IP_VS_PROTO_UDP)
2536 struct ip_vs_proto_data *pd;
2537 #endif
2538
2539 #ifdef CONFIG_IP_VS_PROTO_TCP
2540 pd = ip_vs_proto_data_get(net, IPPROTO_TCP);
2541 u->tcp_timeout = pd->timeout_table[IP_VS_TCP_S_ESTABLISHED] / HZ;
2542 u->tcp_fin_timeout = pd->timeout_table[IP_VS_TCP_S_FIN_WAIT] / HZ;
2543 #endif
2544 #ifdef CONFIG_IP_VS_PROTO_UDP
2545 pd = ip_vs_proto_data_get(net, IPPROTO_UDP);
2546 u->udp_timeout =
2547 pd->timeout_table[IP_VS_UDP_S_NORMAL] / HZ;
2548 #endif
2549 }
2550
2551
2552 #define GET_CMDID(cmd) (cmd - IP_VS_BASE_CTL)
2553 #define GET_INFO_ARG_LEN (sizeof(struct ip_vs_getinfo))
2554 #define GET_SERVICES_ARG_LEN (sizeof(struct ip_vs_get_services))
2555 #define GET_SERVICE_ARG_LEN (sizeof(struct ip_vs_service_entry))
2556 #define GET_DESTS_ARG_LEN (sizeof(struct ip_vs_get_dests))
2557 #define GET_TIMEOUT_ARG_LEN (sizeof(struct ip_vs_timeout_user))
2558 #define GET_DAEMON_ARG_LEN (sizeof(struct ip_vs_daemon_user) * 2)
2559
2560 static const unsigned char get_arglen[GET_CMDID(IP_VS_SO_GET_MAX)+1] = {
2561 [GET_CMDID(IP_VS_SO_GET_VERSION)] = 64,
2562 [GET_CMDID(IP_VS_SO_GET_INFO)] = GET_INFO_ARG_LEN,
2563 [GET_CMDID(IP_VS_SO_GET_SERVICES)] = GET_SERVICES_ARG_LEN,
2564 [GET_CMDID(IP_VS_SO_GET_SERVICE)] = GET_SERVICE_ARG_LEN,
2565 [GET_CMDID(IP_VS_SO_GET_DESTS)] = GET_DESTS_ARG_LEN,
2566 [GET_CMDID(IP_VS_SO_GET_TIMEOUT)] = GET_TIMEOUT_ARG_LEN,
2567 [GET_CMDID(IP_VS_SO_GET_DAEMON)] = GET_DAEMON_ARG_LEN,
2568 };
2569
2570 static int
do_ip_vs_get_ctl(struct sock * sk,int cmd,void __user * user,int * len)2571 do_ip_vs_get_ctl(struct sock *sk, int cmd, void __user *user, int *len)
2572 {
2573 unsigned char arg[128];
2574 int ret = 0;
2575 unsigned int copylen;
2576 struct net *net = sock_net(sk);
2577 struct netns_ipvs *ipvs = net_ipvs(net);
2578
2579 BUG_ON(!net);
2580 if (!capable(CAP_NET_ADMIN))
2581 return -EPERM;
2582
2583 if (cmd < IP_VS_BASE_CTL || cmd > IP_VS_SO_GET_MAX)
2584 return -EINVAL;
2585
2586 if (*len < get_arglen[GET_CMDID(cmd)]) {
2587 pr_err("get_ctl: len %u < %u\n",
2588 *len, get_arglen[GET_CMDID(cmd)]);
2589 return -EINVAL;
2590 }
2591
2592 copylen = get_arglen[GET_CMDID(cmd)];
2593 if (copylen > 128)
2594 return -EINVAL;
2595
2596 if (copy_from_user(arg, user, copylen) != 0)
2597 return -EFAULT;
2598 /*
2599 * Handle daemons first since it has its own locking
2600 */
2601 if (cmd == IP_VS_SO_GET_DAEMON) {
2602 struct ip_vs_daemon_user d[2];
2603
2604 memset(&d, 0, sizeof(d));
2605 if (mutex_lock_interruptible(&ipvs->sync_mutex))
2606 return -ERESTARTSYS;
2607
2608 if (ipvs->sync_state & IP_VS_STATE_MASTER) {
2609 d[0].state = IP_VS_STATE_MASTER;
2610 strlcpy(d[0].mcast_ifn, ipvs->master_mcast_ifn,
2611 sizeof(d[0].mcast_ifn));
2612 d[0].syncid = ipvs->master_syncid;
2613 }
2614 if (ipvs->sync_state & IP_VS_STATE_BACKUP) {
2615 d[1].state = IP_VS_STATE_BACKUP;
2616 strlcpy(d[1].mcast_ifn, ipvs->backup_mcast_ifn,
2617 sizeof(d[1].mcast_ifn));
2618 d[1].syncid = ipvs->backup_syncid;
2619 }
2620 if (copy_to_user(user, &d, sizeof(d)) != 0)
2621 ret = -EFAULT;
2622 mutex_unlock(&ipvs->sync_mutex);
2623 return ret;
2624 }
2625
2626 if (mutex_lock_interruptible(&__ip_vs_mutex))
2627 return -ERESTARTSYS;
2628
2629 switch (cmd) {
2630 case IP_VS_SO_GET_VERSION:
2631 {
2632 char buf[64];
2633
2634 sprintf(buf, "IP Virtual Server version %d.%d.%d (size=%d)",
2635 NVERSION(IP_VS_VERSION_CODE), ip_vs_conn_tab_size);
2636 if (copy_to_user(user, buf, strlen(buf)+1) != 0) {
2637 ret = -EFAULT;
2638 goto out;
2639 }
2640 *len = strlen(buf)+1;
2641 }
2642 break;
2643
2644 case IP_VS_SO_GET_INFO:
2645 {
2646 struct ip_vs_getinfo info;
2647 info.version = IP_VS_VERSION_CODE;
2648 info.size = ip_vs_conn_tab_size;
2649 info.num_services = ipvs->num_services;
2650 if (copy_to_user(user, &info, sizeof(info)) != 0)
2651 ret = -EFAULT;
2652 }
2653 break;
2654
2655 case IP_VS_SO_GET_SERVICES:
2656 {
2657 struct ip_vs_get_services *get;
2658 int size;
2659
2660 get = (struct ip_vs_get_services *)arg;
2661 size = sizeof(*get) +
2662 sizeof(struct ip_vs_service_entry) * get->num_services;
2663 if (*len != size) {
2664 pr_err("length: %u != %u\n", *len, size);
2665 ret = -EINVAL;
2666 goto out;
2667 }
2668 ret = __ip_vs_get_service_entries(net, get, user);
2669 }
2670 break;
2671
2672 case IP_VS_SO_GET_SERVICE:
2673 {
2674 struct ip_vs_service_entry *entry;
2675 struct ip_vs_service *svc;
2676 union nf_inet_addr addr;
2677
2678 entry = (struct ip_vs_service_entry *)arg;
2679 addr.ip = entry->addr;
2680 if (entry->fwmark)
2681 svc = __ip_vs_svc_fwm_find(net, AF_INET, entry->fwmark);
2682 else
2683 svc = __ip_vs_service_find(net, AF_INET,
2684 entry->protocol, &addr,
2685 entry->port);
2686 if (svc) {
2687 ip_vs_copy_service(entry, svc);
2688 if (copy_to_user(user, entry, sizeof(*entry)) != 0)
2689 ret = -EFAULT;
2690 } else
2691 ret = -ESRCH;
2692 }
2693 break;
2694
2695 case IP_VS_SO_GET_DESTS:
2696 {
2697 struct ip_vs_get_dests *get;
2698 int size;
2699
2700 get = (struct ip_vs_get_dests *)arg;
2701 size = sizeof(*get) +
2702 sizeof(struct ip_vs_dest_entry) * get->num_dests;
2703 if (*len != size) {
2704 pr_err("length: %u != %u\n", *len, size);
2705 ret = -EINVAL;
2706 goto out;
2707 }
2708 ret = __ip_vs_get_dest_entries(net, get, user);
2709 }
2710 break;
2711
2712 case IP_VS_SO_GET_TIMEOUT:
2713 {
2714 struct ip_vs_timeout_user t;
2715
2716 __ip_vs_get_timeouts(net, &t);
2717 if (copy_to_user(user, &t, sizeof(t)) != 0)
2718 ret = -EFAULT;
2719 }
2720 break;
2721
2722 default:
2723 ret = -EINVAL;
2724 }
2725
2726 out:
2727 mutex_unlock(&__ip_vs_mutex);
2728 return ret;
2729 }
2730
2731
2732 static struct nf_sockopt_ops ip_vs_sockopts = {
2733 .pf = PF_INET,
2734 .set_optmin = IP_VS_BASE_CTL,
2735 .set_optmax = IP_VS_SO_SET_MAX+1,
2736 .set = do_ip_vs_set_ctl,
2737 .get_optmin = IP_VS_BASE_CTL,
2738 .get_optmax = IP_VS_SO_GET_MAX+1,
2739 .get = do_ip_vs_get_ctl,
2740 .owner = THIS_MODULE,
2741 };
2742
2743 /*
2744 * Generic Netlink interface
2745 */
2746
2747 /* IPVS genetlink family */
2748 static struct genl_family ip_vs_genl_family = {
2749 .id = GENL_ID_GENERATE,
2750 .hdrsize = 0,
2751 .name = IPVS_GENL_NAME,
2752 .version = IPVS_GENL_VERSION,
2753 .maxattr = IPVS_CMD_MAX,
2754 .netnsok = true, /* Make ipvsadm to work on netns */
2755 };
2756
2757 /* Policy used for first-level command attributes */
2758 static const struct nla_policy ip_vs_cmd_policy[IPVS_CMD_ATTR_MAX + 1] = {
2759 [IPVS_CMD_ATTR_SERVICE] = { .type = NLA_NESTED },
2760 [IPVS_CMD_ATTR_DEST] = { .type = NLA_NESTED },
2761 [IPVS_CMD_ATTR_DAEMON] = { .type = NLA_NESTED },
2762 [IPVS_CMD_ATTR_TIMEOUT_TCP] = { .type = NLA_U32 },
2763 [IPVS_CMD_ATTR_TIMEOUT_TCP_FIN] = { .type = NLA_U32 },
2764 [IPVS_CMD_ATTR_TIMEOUT_UDP] = { .type = NLA_U32 },
2765 };
2766
2767 /* Policy used for attributes in nested attribute IPVS_CMD_ATTR_DAEMON */
2768 static const struct nla_policy ip_vs_daemon_policy[IPVS_DAEMON_ATTR_MAX + 1] = {
2769 [IPVS_DAEMON_ATTR_STATE] = { .type = NLA_U32 },
2770 [IPVS_DAEMON_ATTR_MCAST_IFN] = { .type = NLA_NUL_STRING,
2771 .len = IP_VS_IFNAME_MAXLEN },
2772 [IPVS_DAEMON_ATTR_SYNC_ID] = { .type = NLA_U32 },
2773 };
2774
2775 /* Policy used for attributes in nested attribute IPVS_CMD_ATTR_SERVICE */
2776 static const struct nla_policy ip_vs_svc_policy[IPVS_SVC_ATTR_MAX + 1] = {
2777 [IPVS_SVC_ATTR_AF] = { .type = NLA_U16 },
2778 [IPVS_SVC_ATTR_PROTOCOL] = { .type = NLA_U16 },
2779 [IPVS_SVC_ATTR_ADDR] = { .type = NLA_BINARY,
2780 .len = sizeof(union nf_inet_addr) },
2781 [IPVS_SVC_ATTR_PORT] = { .type = NLA_U16 },
2782 [IPVS_SVC_ATTR_FWMARK] = { .type = NLA_U32 },
2783 [IPVS_SVC_ATTR_SCHED_NAME] = { .type = NLA_NUL_STRING,
2784 .len = IP_VS_SCHEDNAME_MAXLEN },
2785 [IPVS_SVC_ATTR_PE_NAME] = { .type = NLA_NUL_STRING,
2786 .len = IP_VS_PENAME_MAXLEN },
2787 [IPVS_SVC_ATTR_FLAGS] = { .type = NLA_BINARY,
2788 .len = sizeof(struct ip_vs_flags) },
2789 [IPVS_SVC_ATTR_TIMEOUT] = { .type = NLA_U32 },
2790 [IPVS_SVC_ATTR_NETMASK] = { .type = NLA_U32 },
2791 [IPVS_SVC_ATTR_STATS] = { .type = NLA_NESTED },
2792 };
2793
2794 /* Policy used for attributes in nested attribute IPVS_CMD_ATTR_DEST */
2795 static const struct nla_policy ip_vs_dest_policy[IPVS_DEST_ATTR_MAX + 1] = {
2796 [IPVS_DEST_ATTR_ADDR] = { .type = NLA_BINARY,
2797 .len = sizeof(union nf_inet_addr) },
2798 [IPVS_DEST_ATTR_PORT] = { .type = NLA_U16 },
2799 [IPVS_DEST_ATTR_FWD_METHOD] = { .type = NLA_U32 },
2800 [IPVS_DEST_ATTR_WEIGHT] = { .type = NLA_U32 },
2801 [IPVS_DEST_ATTR_U_THRESH] = { .type = NLA_U32 },
2802 [IPVS_DEST_ATTR_L_THRESH] = { .type = NLA_U32 },
2803 [IPVS_DEST_ATTR_ACTIVE_CONNS] = { .type = NLA_U32 },
2804 [IPVS_DEST_ATTR_INACT_CONNS] = { .type = NLA_U32 },
2805 [IPVS_DEST_ATTR_PERSIST_CONNS] = { .type = NLA_U32 },
2806 [IPVS_DEST_ATTR_STATS] = { .type = NLA_NESTED },
2807 };
2808
ip_vs_genl_fill_stats(struct sk_buff * skb,int container_type,struct ip_vs_stats * stats)2809 static int ip_vs_genl_fill_stats(struct sk_buff *skb, int container_type,
2810 struct ip_vs_stats *stats)
2811 {
2812 struct ip_vs_stats_user ustats;
2813 struct nlattr *nl_stats = nla_nest_start(skb, container_type);
2814 if (!nl_stats)
2815 return -EMSGSIZE;
2816
2817 ip_vs_copy_stats(&ustats, stats);
2818
2819 NLA_PUT_U32(skb, IPVS_STATS_ATTR_CONNS, ustats.conns);
2820 NLA_PUT_U32(skb, IPVS_STATS_ATTR_INPKTS, ustats.inpkts);
2821 NLA_PUT_U32(skb, IPVS_STATS_ATTR_OUTPKTS, ustats.outpkts);
2822 NLA_PUT_U64(skb, IPVS_STATS_ATTR_INBYTES, ustats.inbytes);
2823 NLA_PUT_U64(skb, IPVS_STATS_ATTR_OUTBYTES, ustats.outbytes);
2824 NLA_PUT_U32(skb, IPVS_STATS_ATTR_CPS, ustats.cps);
2825 NLA_PUT_U32(skb, IPVS_STATS_ATTR_INPPS, ustats.inpps);
2826 NLA_PUT_U32(skb, IPVS_STATS_ATTR_OUTPPS, ustats.outpps);
2827 NLA_PUT_U32(skb, IPVS_STATS_ATTR_INBPS, ustats.inbps);
2828 NLA_PUT_U32(skb, IPVS_STATS_ATTR_OUTBPS, ustats.outbps);
2829
2830 nla_nest_end(skb, nl_stats);
2831
2832 return 0;
2833
2834 nla_put_failure:
2835 nla_nest_cancel(skb, nl_stats);
2836 return -EMSGSIZE;
2837 }
2838
ip_vs_genl_fill_service(struct sk_buff * skb,struct ip_vs_service * svc)2839 static int ip_vs_genl_fill_service(struct sk_buff *skb,
2840 struct ip_vs_service *svc)
2841 {
2842 struct nlattr *nl_service;
2843 struct ip_vs_flags flags = { .flags = svc->flags,
2844 .mask = ~0 };
2845
2846 nl_service = nla_nest_start(skb, IPVS_CMD_ATTR_SERVICE);
2847 if (!nl_service)
2848 return -EMSGSIZE;
2849
2850 NLA_PUT_U16(skb, IPVS_SVC_ATTR_AF, svc->af);
2851
2852 if (svc->fwmark) {
2853 NLA_PUT_U32(skb, IPVS_SVC_ATTR_FWMARK, svc->fwmark);
2854 } else {
2855 NLA_PUT_U16(skb, IPVS_SVC_ATTR_PROTOCOL, svc->protocol);
2856 NLA_PUT(skb, IPVS_SVC_ATTR_ADDR, sizeof(svc->addr), &svc->addr);
2857 NLA_PUT_U16(skb, IPVS_SVC_ATTR_PORT, svc->port);
2858 }
2859
2860 NLA_PUT_STRING(skb, IPVS_SVC_ATTR_SCHED_NAME, svc->scheduler->name);
2861 if (svc->pe)
2862 NLA_PUT_STRING(skb, IPVS_SVC_ATTR_PE_NAME, svc->pe->name);
2863 NLA_PUT(skb, IPVS_SVC_ATTR_FLAGS, sizeof(flags), &flags);
2864 NLA_PUT_U32(skb, IPVS_SVC_ATTR_TIMEOUT, svc->timeout / HZ);
2865 NLA_PUT_U32(skb, IPVS_SVC_ATTR_NETMASK, svc->netmask);
2866
2867 if (ip_vs_genl_fill_stats(skb, IPVS_SVC_ATTR_STATS, &svc->stats))
2868 goto nla_put_failure;
2869
2870 nla_nest_end(skb, nl_service);
2871
2872 return 0;
2873
2874 nla_put_failure:
2875 nla_nest_cancel(skb, nl_service);
2876 return -EMSGSIZE;
2877 }
2878
ip_vs_genl_dump_service(struct sk_buff * skb,struct ip_vs_service * svc,struct netlink_callback * cb)2879 static int ip_vs_genl_dump_service(struct sk_buff *skb,
2880 struct ip_vs_service *svc,
2881 struct netlink_callback *cb)
2882 {
2883 void *hdr;
2884
2885 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).pid, cb->nlh->nlmsg_seq,
2886 &ip_vs_genl_family, NLM_F_MULTI,
2887 IPVS_CMD_NEW_SERVICE);
2888 if (!hdr)
2889 return -EMSGSIZE;
2890
2891 if (ip_vs_genl_fill_service(skb, svc) < 0)
2892 goto nla_put_failure;
2893
2894 return genlmsg_end(skb, hdr);
2895
2896 nla_put_failure:
2897 genlmsg_cancel(skb, hdr);
2898 return -EMSGSIZE;
2899 }
2900
ip_vs_genl_dump_services(struct sk_buff * skb,struct netlink_callback * cb)2901 static int ip_vs_genl_dump_services(struct sk_buff *skb,
2902 struct netlink_callback *cb)
2903 {
2904 int idx = 0, i;
2905 int start = cb->args[0];
2906 struct ip_vs_service *svc;
2907 struct net *net = skb_sknet(skb);
2908
2909 mutex_lock(&__ip_vs_mutex);
2910 for (i = 0; i < IP_VS_SVC_TAB_SIZE; i++) {
2911 list_for_each_entry(svc, &ip_vs_svc_table[i], s_list) {
2912 if (++idx <= start || !net_eq(svc->net, net))
2913 continue;
2914 if (ip_vs_genl_dump_service(skb, svc, cb) < 0) {
2915 idx--;
2916 goto nla_put_failure;
2917 }
2918 }
2919 }
2920
2921 for (i = 0; i < IP_VS_SVC_TAB_SIZE; i++) {
2922 list_for_each_entry(svc, &ip_vs_svc_fwm_table[i], f_list) {
2923 if (++idx <= start || !net_eq(svc->net, net))
2924 continue;
2925 if (ip_vs_genl_dump_service(skb, svc, cb) < 0) {
2926 idx--;
2927 goto nla_put_failure;
2928 }
2929 }
2930 }
2931
2932 nla_put_failure:
2933 mutex_unlock(&__ip_vs_mutex);
2934 cb->args[0] = idx;
2935
2936 return skb->len;
2937 }
2938
ip_vs_genl_parse_service(struct net * net,struct ip_vs_service_user_kern * usvc,struct nlattr * nla,int full_entry,struct ip_vs_service ** ret_svc)2939 static int ip_vs_genl_parse_service(struct net *net,
2940 struct ip_vs_service_user_kern *usvc,
2941 struct nlattr *nla, int full_entry,
2942 struct ip_vs_service **ret_svc)
2943 {
2944 struct nlattr *attrs[IPVS_SVC_ATTR_MAX + 1];
2945 struct nlattr *nla_af, *nla_port, *nla_fwmark, *nla_protocol, *nla_addr;
2946 struct ip_vs_service *svc;
2947
2948 /* Parse mandatory identifying service fields first */
2949 if (nla == NULL ||
2950 nla_parse_nested(attrs, IPVS_SVC_ATTR_MAX, nla, ip_vs_svc_policy))
2951 return -EINVAL;
2952
2953 nla_af = attrs[IPVS_SVC_ATTR_AF];
2954 nla_protocol = attrs[IPVS_SVC_ATTR_PROTOCOL];
2955 nla_addr = attrs[IPVS_SVC_ATTR_ADDR];
2956 nla_port = attrs[IPVS_SVC_ATTR_PORT];
2957 nla_fwmark = attrs[IPVS_SVC_ATTR_FWMARK];
2958
2959 if (!(nla_af && (nla_fwmark || (nla_port && nla_protocol && nla_addr))))
2960 return -EINVAL;
2961
2962 memset(usvc, 0, sizeof(*usvc));
2963
2964 usvc->af = nla_get_u16(nla_af);
2965 #ifdef CONFIG_IP_VS_IPV6
2966 if (usvc->af != AF_INET && usvc->af != AF_INET6)
2967 #else
2968 if (usvc->af != AF_INET)
2969 #endif
2970 return -EAFNOSUPPORT;
2971
2972 if (nla_fwmark) {
2973 usvc->protocol = IPPROTO_TCP;
2974 usvc->fwmark = nla_get_u32(nla_fwmark);
2975 } else {
2976 usvc->protocol = nla_get_u16(nla_protocol);
2977 nla_memcpy(&usvc->addr, nla_addr, sizeof(usvc->addr));
2978 usvc->port = nla_get_u16(nla_port);
2979 usvc->fwmark = 0;
2980 }
2981
2982 if (usvc->fwmark)
2983 svc = __ip_vs_svc_fwm_find(net, usvc->af, usvc->fwmark);
2984 else
2985 svc = __ip_vs_service_find(net, usvc->af, usvc->protocol,
2986 &usvc->addr, usvc->port);
2987 *ret_svc = svc;
2988
2989 /* If a full entry was requested, check for the additional fields */
2990 if (full_entry) {
2991 struct nlattr *nla_sched, *nla_flags, *nla_pe, *nla_timeout,
2992 *nla_netmask;
2993 struct ip_vs_flags flags;
2994
2995 nla_sched = attrs[IPVS_SVC_ATTR_SCHED_NAME];
2996 nla_pe = attrs[IPVS_SVC_ATTR_PE_NAME];
2997 nla_flags = attrs[IPVS_SVC_ATTR_FLAGS];
2998 nla_timeout = attrs[IPVS_SVC_ATTR_TIMEOUT];
2999 nla_netmask = attrs[IPVS_SVC_ATTR_NETMASK];
3000
3001 if (!(nla_sched && nla_flags && nla_timeout && nla_netmask))
3002 return -EINVAL;
3003
3004 nla_memcpy(&flags, nla_flags, sizeof(flags));
3005
3006 /* prefill flags from service if it already exists */
3007 if (svc)
3008 usvc->flags = svc->flags;
3009
3010 /* set new flags from userland */
3011 usvc->flags = (usvc->flags & ~flags.mask) |
3012 (flags.flags & flags.mask);
3013 usvc->sched_name = nla_data(nla_sched);
3014 usvc->pe_name = nla_pe ? nla_data(nla_pe) : NULL;
3015 usvc->timeout = nla_get_u32(nla_timeout);
3016 usvc->netmask = nla_get_u32(nla_netmask);
3017 }
3018
3019 return 0;
3020 }
3021
ip_vs_genl_find_service(struct net * net,struct nlattr * nla)3022 static struct ip_vs_service *ip_vs_genl_find_service(struct net *net,
3023 struct nlattr *nla)
3024 {
3025 struct ip_vs_service_user_kern usvc;
3026 struct ip_vs_service *svc;
3027 int ret;
3028
3029 ret = ip_vs_genl_parse_service(net, &usvc, nla, 0, &svc);
3030 return ret ? ERR_PTR(ret) : svc;
3031 }
3032
ip_vs_genl_fill_dest(struct sk_buff * skb,struct ip_vs_dest * dest)3033 static int ip_vs_genl_fill_dest(struct sk_buff *skb, struct ip_vs_dest *dest)
3034 {
3035 struct nlattr *nl_dest;
3036
3037 nl_dest = nla_nest_start(skb, IPVS_CMD_ATTR_DEST);
3038 if (!nl_dest)
3039 return -EMSGSIZE;
3040
3041 NLA_PUT(skb, IPVS_DEST_ATTR_ADDR, sizeof(dest->addr), &dest->addr);
3042 NLA_PUT_U16(skb, IPVS_DEST_ATTR_PORT, dest->port);
3043
3044 NLA_PUT_U32(skb, IPVS_DEST_ATTR_FWD_METHOD,
3045 atomic_read(&dest->conn_flags) & IP_VS_CONN_F_FWD_MASK);
3046 NLA_PUT_U32(skb, IPVS_DEST_ATTR_WEIGHT, atomic_read(&dest->weight));
3047 NLA_PUT_U32(skb, IPVS_DEST_ATTR_U_THRESH, dest->u_threshold);
3048 NLA_PUT_U32(skb, IPVS_DEST_ATTR_L_THRESH, dest->l_threshold);
3049 NLA_PUT_U32(skb, IPVS_DEST_ATTR_ACTIVE_CONNS,
3050 atomic_read(&dest->activeconns));
3051 NLA_PUT_U32(skb, IPVS_DEST_ATTR_INACT_CONNS,
3052 atomic_read(&dest->inactconns));
3053 NLA_PUT_U32(skb, IPVS_DEST_ATTR_PERSIST_CONNS,
3054 atomic_read(&dest->persistconns));
3055
3056 if (ip_vs_genl_fill_stats(skb, IPVS_DEST_ATTR_STATS, &dest->stats))
3057 goto nla_put_failure;
3058
3059 nla_nest_end(skb, nl_dest);
3060
3061 return 0;
3062
3063 nla_put_failure:
3064 nla_nest_cancel(skb, nl_dest);
3065 return -EMSGSIZE;
3066 }
3067
ip_vs_genl_dump_dest(struct sk_buff * skb,struct ip_vs_dest * dest,struct netlink_callback * cb)3068 static int ip_vs_genl_dump_dest(struct sk_buff *skb, struct ip_vs_dest *dest,
3069 struct netlink_callback *cb)
3070 {
3071 void *hdr;
3072
3073 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).pid, cb->nlh->nlmsg_seq,
3074 &ip_vs_genl_family, NLM_F_MULTI,
3075 IPVS_CMD_NEW_DEST);
3076 if (!hdr)
3077 return -EMSGSIZE;
3078
3079 if (ip_vs_genl_fill_dest(skb, dest) < 0)
3080 goto nla_put_failure;
3081
3082 return genlmsg_end(skb, hdr);
3083
3084 nla_put_failure:
3085 genlmsg_cancel(skb, hdr);
3086 return -EMSGSIZE;
3087 }
3088
ip_vs_genl_dump_dests(struct sk_buff * skb,struct netlink_callback * cb)3089 static int ip_vs_genl_dump_dests(struct sk_buff *skb,
3090 struct netlink_callback *cb)
3091 {
3092 int idx = 0;
3093 int start = cb->args[0];
3094 struct ip_vs_service *svc;
3095 struct ip_vs_dest *dest;
3096 struct nlattr *attrs[IPVS_CMD_ATTR_MAX + 1];
3097 struct net *net = skb_sknet(skb);
3098
3099 mutex_lock(&__ip_vs_mutex);
3100
3101 /* Try to find the service for which to dump destinations */
3102 if (nlmsg_parse(cb->nlh, GENL_HDRLEN, attrs,
3103 IPVS_CMD_ATTR_MAX, ip_vs_cmd_policy))
3104 goto out_err;
3105
3106
3107 svc = ip_vs_genl_find_service(net, attrs[IPVS_CMD_ATTR_SERVICE]);
3108 if (IS_ERR(svc) || svc == NULL)
3109 goto out_err;
3110
3111 /* Dump the destinations */
3112 list_for_each_entry(dest, &svc->destinations, n_list) {
3113 if (++idx <= start)
3114 continue;
3115 if (ip_vs_genl_dump_dest(skb, dest, cb) < 0) {
3116 idx--;
3117 goto nla_put_failure;
3118 }
3119 }
3120
3121 nla_put_failure:
3122 cb->args[0] = idx;
3123
3124 out_err:
3125 mutex_unlock(&__ip_vs_mutex);
3126
3127 return skb->len;
3128 }
3129
ip_vs_genl_parse_dest(struct ip_vs_dest_user_kern * udest,struct nlattr * nla,int full_entry)3130 static int ip_vs_genl_parse_dest(struct ip_vs_dest_user_kern *udest,
3131 struct nlattr *nla, int full_entry)
3132 {
3133 struct nlattr *attrs[IPVS_DEST_ATTR_MAX + 1];
3134 struct nlattr *nla_addr, *nla_port;
3135
3136 /* Parse mandatory identifying destination fields first */
3137 if (nla == NULL ||
3138 nla_parse_nested(attrs, IPVS_DEST_ATTR_MAX, nla, ip_vs_dest_policy))
3139 return -EINVAL;
3140
3141 nla_addr = attrs[IPVS_DEST_ATTR_ADDR];
3142 nla_port = attrs[IPVS_DEST_ATTR_PORT];
3143
3144 if (!(nla_addr && nla_port))
3145 return -EINVAL;
3146
3147 memset(udest, 0, sizeof(*udest));
3148
3149 nla_memcpy(&udest->addr, nla_addr, sizeof(udest->addr));
3150 udest->port = nla_get_u16(nla_port);
3151
3152 /* If a full entry was requested, check for the additional fields */
3153 if (full_entry) {
3154 struct nlattr *nla_fwd, *nla_weight, *nla_u_thresh,
3155 *nla_l_thresh;
3156
3157 nla_fwd = attrs[IPVS_DEST_ATTR_FWD_METHOD];
3158 nla_weight = attrs[IPVS_DEST_ATTR_WEIGHT];
3159 nla_u_thresh = attrs[IPVS_DEST_ATTR_U_THRESH];
3160 nla_l_thresh = attrs[IPVS_DEST_ATTR_L_THRESH];
3161
3162 if (!(nla_fwd && nla_weight && nla_u_thresh && nla_l_thresh))
3163 return -EINVAL;
3164
3165 udest->conn_flags = nla_get_u32(nla_fwd)
3166 & IP_VS_CONN_F_FWD_MASK;
3167 udest->weight = nla_get_u32(nla_weight);
3168 udest->u_threshold = nla_get_u32(nla_u_thresh);
3169 udest->l_threshold = nla_get_u32(nla_l_thresh);
3170 }
3171
3172 return 0;
3173 }
3174
ip_vs_genl_fill_daemon(struct sk_buff * skb,__be32 state,const char * mcast_ifn,__be32 syncid)3175 static int ip_vs_genl_fill_daemon(struct sk_buff *skb, __be32 state,
3176 const char *mcast_ifn, __be32 syncid)
3177 {
3178 struct nlattr *nl_daemon;
3179
3180 nl_daemon = nla_nest_start(skb, IPVS_CMD_ATTR_DAEMON);
3181 if (!nl_daemon)
3182 return -EMSGSIZE;
3183
3184 NLA_PUT_U32(skb, IPVS_DAEMON_ATTR_STATE, state);
3185 NLA_PUT_STRING(skb, IPVS_DAEMON_ATTR_MCAST_IFN, mcast_ifn);
3186 NLA_PUT_U32(skb, IPVS_DAEMON_ATTR_SYNC_ID, syncid);
3187
3188 nla_nest_end(skb, nl_daemon);
3189
3190 return 0;
3191
3192 nla_put_failure:
3193 nla_nest_cancel(skb, nl_daemon);
3194 return -EMSGSIZE;
3195 }
3196
ip_vs_genl_dump_daemon(struct sk_buff * skb,__be32 state,const char * mcast_ifn,__be32 syncid,struct netlink_callback * cb)3197 static int ip_vs_genl_dump_daemon(struct sk_buff *skb, __be32 state,
3198 const char *mcast_ifn, __be32 syncid,
3199 struct netlink_callback *cb)
3200 {
3201 void *hdr;
3202 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).pid, cb->nlh->nlmsg_seq,
3203 &ip_vs_genl_family, NLM_F_MULTI,
3204 IPVS_CMD_NEW_DAEMON);
3205 if (!hdr)
3206 return -EMSGSIZE;
3207
3208 if (ip_vs_genl_fill_daemon(skb, state, mcast_ifn, syncid))
3209 goto nla_put_failure;
3210
3211 return genlmsg_end(skb, hdr);
3212
3213 nla_put_failure:
3214 genlmsg_cancel(skb, hdr);
3215 return -EMSGSIZE;
3216 }
3217
ip_vs_genl_dump_daemons(struct sk_buff * skb,struct netlink_callback * cb)3218 static int ip_vs_genl_dump_daemons(struct sk_buff *skb,
3219 struct netlink_callback *cb)
3220 {
3221 struct net *net = skb_sknet(skb);
3222 struct netns_ipvs *ipvs = net_ipvs(net);
3223
3224 mutex_lock(&ipvs->sync_mutex);
3225 if ((ipvs->sync_state & IP_VS_STATE_MASTER) && !cb->args[0]) {
3226 if (ip_vs_genl_dump_daemon(skb, IP_VS_STATE_MASTER,
3227 ipvs->master_mcast_ifn,
3228 ipvs->master_syncid, cb) < 0)
3229 goto nla_put_failure;
3230
3231 cb->args[0] = 1;
3232 }
3233
3234 if ((ipvs->sync_state & IP_VS_STATE_BACKUP) && !cb->args[1]) {
3235 if (ip_vs_genl_dump_daemon(skb, IP_VS_STATE_BACKUP,
3236 ipvs->backup_mcast_ifn,
3237 ipvs->backup_syncid, cb) < 0)
3238 goto nla_put_failure;
3239
3240 cb->args[1] = 1;
3241 }
3242
3243 nla_put_failure:
3244 mutex_unlock(&ipvs->sync_mutex);
3245
3246 return skb->len;
3247 }
3248
ip_vs_genl_new_daemon(struct net * net,struct nlattr ** attrs)3249 static int ip_vs_genl_new_daemon(struct net *net, struct nlattr **attrs)
3250 {
3251 if (!(attrs[IPVS_DAEMON_ATTR_STATE] &&
3252 attrs[IPVS_DAEMON_ATTR_MCAST_IFN] &&
3253 attrs[IPVS_DAEMON_ATTR_SYNC_ID]))
3254 return -EINVAL;
3255
3256 return start_sync_thread(net,
3257 nla_get_u32(attrs[IPVS_DAEMON_ATTR_STATE]),
3258 nla_data(attrs[IPVS_DAEMON_ATTR_MCAST_IFN]),
3259 nla_get_u32(attrs[IPVS_DAEMON_ATTR_SYNC_ID]));
3260 }
3261
ip_vs_genl_del_daemon(struct net * net,struct nlattr ** attrs)3262 static int ip_vs_genl_del_daemon(struct net *net, struct nlattr **attrs)
3263 {
3264 if (!attrs[IPVS_DAEMON_ATTR_STATE])
3265 return -EINVAL;
3266
3267 return stop_sync_thread(net,
3268 nla_get_u32(attrs[IPVS_DAEMON_ATTR_STATE]));
3269 }
3270
ip_vs_genl_set_config(struct net * net,struct nlattr ** attrs)3271 static int ip_vs_genl_set_config(struct net *net, struct nlattr **attrs)
3272 {
3273 struct ip_vs_timeout_user t;
3274
3275 __ip_vs_get_timeouts(net, &t);
3276
3277 if (attrs[IPVS_CMD_ATTR_TIMEOUT_TCP])
3278 t.tcp_timeout = nla_get_u32(attrs[IPVS_CMD_ATTR_TIMEOUT_TCP]);
3279
3280 if (attrs[IPVS_CMD_ATTR_TIMEOUT_TCP_FIN])
3281 t.tcp_fin_timeout =
3282 nla_get_u32(attrs[IPVS_CMD_ATTR_TIMEOUT_TCP_FIN]);
3283
3284 if (attrs[IPVS_CMD_ATTR_TIMEOUT_UDP])
3285 t.udp_timeout = nla_get_u32(attrs[IPVS_CMD_ATTR_TIMEOUT_UDP]);
3286
3287 return ip_vs_set_timeout(net, &t);
3288 }
3289
ip_vs_genl_set_daemon(struct sk_buff * skb,struct genl_info * info)3290 static int ip_vs_genl_set_daemon(struct sk_buff *skb, struct genl_info *info)
3291 {
3292 int ret = 0, cmd;
3293 struct net *net;
3294 struct netns_ipvs *ipvs;
3295
3296 net = skb_sknet(skb);
3297 ipvs = net_ipvs(net);
3298 cmd = info->genlhdr->cmd;
3299
3300 if (cmd == IPVS_CMD_NEW_DAEMON || cmd == IPVS_CMD_DEL_DAEMON) {
3301 struct nlattr *daemon_attrs[IPVS_DAEMON_ATTR_MAX + 1];
3302
3303 mutex_lock(&ipvs->sync_mutex);
3304 if (!info->attrs[IPVS_CMD_ATTR_DAEMON] ||
3305 nla_parse_nested(daemon_attrs, IPVS_DAEMON_ATTR_MAX,
3306 info->attrs[IPVS_CMD_ATTR_DAEMON],
3307 ip_vs_daemon_policy)) {
3308 ret = -EINVAL;
3309 goto out;
3310 }
3311
3312 if (cmd == IPVS_CMD_NEW_DAEMON)
3313 ret = ip_vs_genl_new_daemon(net, daemon_attrs);
3314 else
3315 ret = ip_vs_genl_del_daemon(net, daemon_attrs);
3316 out:
3317 mutex_unlock(&ipvs->sync_mutex);
3318 }
3319 return ret;
3320 }
3321
ip_vs_genl_set_cmd(struct sk_buff * skb,struct genl_info * info)3322 static int ip_vs_genl_set_cmd(struct sk_buff *skb, struct genl_info *info)
3323 {
3324 struct ip_vs_service *svc = NULL;
3325 struct ip_vs_service_user_kern usvc;
3326 struct ip_vs_dest_user_kern udest;
3327 int ret = 0, cmd;
3328 int need_full_svc = 0, need_full_dest = 0;
3329 struct net *net;
3330
3331 net = skb_sknet(skb);
3332 cmd = info->genlhdr->cmd;
3333
3334 mutex_lock(&__ip_vs_mutex);
3335
3336 if (cmd == IPVS_CMD_FLUSH) {
3337 ret = ip_vs_flush(net);
3338 goto out;
3339 } else if (cmd == IPVS_CMD_SET_CONFIG) {
3340 ret = ip_vs_genl_set_config(net, info->attrs);
3341 goto out;
3342 } else if (cmd == IPVS_CMD_ZERO &&
3343 !info->attrs[IPVS_CMD_ATTR_SERVICE]) {
3344 ret = ip_vs_zero_all(net);
3345 goto out;
3346 }
3347
3348 /* All following commands require a service argument, so check if we
3349 * received a valid one. We need a full service specification when
3350 * adding / editing a service. Only identifying members otherwise. */
3351 if (cmd == IPVS_CMD_NEW_SERVICE || cmd == IPVS_CMD_SET_SERVICE)
3352 need_full_svc = 1;
3353
3354 ret = ip_vs_genl_parse_service(net, &usvc,
3355 info->attrs[IPVS_CMD_ATTR_SERVICE],
3356 need_full_svc, &svc);
3357 if (ret)
3358 goto out;
3359
3360 /* Unless we're adding a new service, the service must already exist */
3361 if ((cmd != IPVS_CMD_NEW_SERVICE) && (svc == NULL)) {
3362 ret = -ESRCH;
3363 goto out;
3364 }
3365
3366 /* Destination commands require a valid destination argument. For
3367 * adding / editing a destination, we need a full destination
3368 * specification. */
3369 if (cmd == IPVS_CMD_NEW_DEST || cmd == IPVS_CMD_SET_DEST ||
3370 cmd == IPVS_CMD_DEL_DEST) {
3371 if (cmd != IPVS_CMD_DEL_DEST)
3372 need_full_dest = 1;
3373
3374 ret = ip_vs_genl_parse_dest(&udest,
3375 info->attrs[IPVS_CMD_ATTR_DEST],
3376 need_full_dest);
3377 if (ret)
3378 goto out;
3379 }
3380
3381 switch (cmd) {
3382 case IPVS_CMD_NEW_SERVICE:
3383 if (svc == NULL)
3384 ret = ip_vs_add_service(net, &usvc, &svc);
3385 else
3386 ret = -EEXIST;
3387 break;
3388 case IPVS_CMD_SET_SERVICE:
3389 ret = ip_vs_edit_service(svc, &usvc);
3390 break;
3391 case IPVS_CMD_DEL_SERVICE:
3392 ret = ip_vs_del_service(svc);
3393 /* do not use svc, it can be freed */
3394 break;
3395 case IPVS_CMD_NEW_DEST:
3396 ret = ip_vs_add_dest(svc, &udest);
3397 break;
3398 case IPVS_CMD_SET_DEST:
3399 ret = ip_vs_edit_dest(svc, &udest);
3400 break;
3401 case IPVS_CMD_DEL_DEST:
3402 ret = ip_vs_del_dest(svc, &udest);
3403 break;
3404 case IPVS_CMD_ZERO:
3405 ret = ip_vs_zero_service(svc);
3406 break;
3407 default:
3408 ret = -EINVAL;
3409 }
3410
3411 out:
3412 mutex_unlock(&__ip_vs_mutex);
3413
3414 return ret;
3415 }
3416
ip_vs_genl_get_cmd(struct sk_buff * skb,struct genl_info * info)3417 static int ip_vs_genl_get_cmd(struct sk_buff *skb, struct genl_info *info)
3418 {
3419 struct sk_buff *msg;
3420 void *reply;
3421 int ret, cmd, reply_cmd;
3422 struct net *net;
3423
3424 net = skb_sknet(skb);
3425 cmd = info->genlhdr->cmd;
3426
3427 if (cmd == IPVS_CMD_GET_SERVICE)
3428 reply_cmd = IPVS_CMD_NEW_SERVICE;
3429 else if (cmd == IPVS_CMD_GET_INFO)
3430 reply_cmd = IPVS_CMD_SET_INFO;
3431 else if (cmd == IPVS_CMD_GET_CONFIG)
3432 reply_cmd = IPVS_CMD_SET_CONFIG;
3433 else {
3434 pr_err("unknown Generic Netlink command\n");
3435 return -EINVAL;
3436 }
3437
3438 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
3439 if (!msg)
3440 return -ENOMEM;
3441
3442 mutex_lock(&__ip_vs_mutex);
3443
3444 reply = genlmsg_put_reply(msg, info, &ip_vs_genl_family, 0, reply_cmd);
3445 if (reply == NULL)
3446 goto nla_put_failure;
3447
3448 switch (cmd) {
3449 case IPVS_CMD_GET_SERVICE:
3450 {
3451 struct ip_vs_service *svc;
3452
3453 svc = ip_vs_genl_find_service(net,
3454 info->attrs[IPVS_CMD_ATTR_SERVICE]);
3455 if (IS_ERR(svc)) {
3456 ret = PTR_ERR(svc);
3457 goto out_err;
3458 } else if (svc) {
3459 ret = ip_vs_genl_fill_service(msg, svc);
3460 if (ret)
3461 goto nla_put_failure;
3462 } else {
3463 ret = -ESRCH;
3464 goto out_err;
3465 }
3466
3467 break;
3468 }
3469
3470 case IPVS_CMD_GET_CONFIG:
3471 {
3472 struct ip_vs_timeout_user t;
3473
3474 __ip_vs_get_timeouts(net, &t);
3475 #ifdef CONFIG_IP_VS_PROTO_TCP
3476 NLA_PUT_U32(msg, IPVS_CMD_ATTR_TIMEOUT_TCP, t.tcp_timeout);
3477 NLA_PUT_U32(msg, IPVS_CMD_ATTR_TIMEOUT_TCP_FIN,
3478 t.tcp_fin_timeout);
3479 #endif
3480 #ifdef CONFIG_IP_VS_PROTO_UDP
3481 NLA_PUT_U32(msg, IPVS_CMD_ATTR_TIMEOUT_UDP, t.udp_timeout);
3482 #endif
3483
3484 break;
3485 }
3486
3487 case IPVS_CMD_GET_INFO:
3488 NLA_PUT_U32(msg, IPVS_INFO_ATTR_VERSION, IP_VS_VERSION_CODE);
3489 NLA_PUT_U32(msg, IPVS_INFO_ATTR_CONN_TAB_SIZE,
3490 ip_vs_conn_tab_size);
3491 break;
3492 }
3493
3494 genlmsg_end(msg, reply);
3495 ret = genlmsg_reply(msg, info);
3496 goto out;
3497
3498 nla_put_failure:
3499 pr_err("not enough space in Netlink message\n");
3500 ret = -EMSGSIZE;
3501
3502 out_err:
3503 nlmsg_free(msg);
3504 out:
3505 mutex_unlock(&__ip_vs_mutex);
3506
3507 return ret;
3508 }
3509
3510
3511 static struct genl_ops ip_vs_genl_ops[] __read_mostly = {
3512 {
3513 .cmd = IPVS_CMD_NEW_SERVICE,
3514 .flags = GENL_ADMIN_PERM,
3515 .policy = ip_vs_cmd_policy,
3516 .doit = ip_vs_genl_set_cmd,
3517 },
3518 {
3519 .cmd = IPVS_CMD_SET_SERVICE,
3520 .flags = GENL_ADMIN_PERM,
3521 .policy = ip_vs_cmd_policy,
3522 .doit = ip_vs_genl_set_cmd,
3523 },
3524 {
3525 .cmd = IPVS_CMD_DEL_SERVICE,
3526 .flags = GENL_ADMIN_PERM,
3527 .policy = ip_vs_cmd_policy,
3528 .doit = ip_vs_genl_set_cmd,
3529 },
3530 {
3531 .cmd = IPVS_CMD_GET_SERVICE,
3532 .flags = GENL_ADMIN_PERM,
3533 .doit = ip_vs_genl_get_cmd,
3534 .dumpit = ip_vs_genl_dump_services,
3535 .policy = ip_vs_cmd_policy,
3536 },
3537 {
3538 .cmd = IPVS_CMD_NEW_DEST,
3539 .flags = GENL_ADMIN_PERM,
3540 .policy = ip_vs_cmd_policy,
3541 .doit = ip_vs_genl_set_cmd,
3542 },
3543 {
3544 .cmd = IPVS_CMD_SET_DEST,
3545 .flags = GENL_ADMIN_PERM,
3546 .policy = ip_vs_cmd_policy,
3547 .doit = ip_vs_genl_set_cmd,
3548 },
3549 {
3550 .cmd = IPVS_CMD_DEL_DEST,
3551 .flags = GENL_ADMIN_PERM,
3552 .policy = ip_vs_cmd_policy,
3553 .doit = ip_vs_genl_set_cmd,
3554 },
3555 {
3556 .cmd = IPVS_CMD_GET_DEST,
3557 .flags = GENL_ADMIN_PERM,
3558 .policy = ip_vs_cmd_policy,
3559 .dumpit = ip_vs_genl_dump_dests,
3560 },
3561 {
3562 .cmd = IPVS_CMD_NEW_DAEMON,
3563 .flags = GENL_ADMIN_PERM,
3564 .policy = ip_vs_cmd_policy,
3565 .doit = ip_vs_genl_set_daemon,
3566 },
3567 {
3568 .cmd = IPVS_CMD_DEL_DAEMON,
3569 .flags = GENL_ADMIN_PERM,
3570 .policy = ip_vs_cmd_policy,
3571 .doit = ip_vs_genl_set_daemon,
3572 },
3573 {
3574 .cmd = IPVS_CMD_GET_DAEMON,
3575 .flags = GENL_ADMIN_PERM,
3576 .dumpit = ip_vs_genl_dump_daemons,
3577 },
3578 {
3579 .cmd = IPVS_CMD_SET_CONFIG,
3580 .flags = GENL_ADMIN_PERM,
3581 .policy = ip_vs_cmd_policy,
3582 .doit = ip_vs_genl_set_cmd,
3583 },
3584 {
3585 .cmd = IPVS_CMD_GET_CONFIG,
3586 .flags = GENL_ADMIN_PERM,
3587 .doit = ip_vs_genl_get_cmd,
3588 },
3589 {
3590 .cmd = IPVS_CMD_GET_INFO,
3591 .flags = GENL_ADMIN_PERM,
3592 .doit = ip_vs_genl_get_cmd,
3593 },
3594 {
3595 .cmd = IPVS_CMD_ZERO,
3596 .flags = GENL_ADMIN_PERM,
3597 .policy = ip_vs_cmd_policy,
3598 .doit = ip_vs_genl_set_cmd,
3599 },
3600 {
3601 .cmd = IPVS_CMD_FLUSH,
3602 .flags = GENL_ADMIN_PERM,
3603 .doit = ip_vs_genl_set_cmd,
3604 },
3605 };
3606
ip_vs_genl_register(void)3607 static int __init ip_vs_genl_register(void)
3608 {
3609 return genl_register_family_with_ops(&ip_vs_genl_family,
3610 ip_vs_genl_ops, ARRAY_SIZE(ip_vs_genl_ops));
3611 }
3612
ip_vs_genl_unregister(void)3613 static void ip_vs_genl_unregister(void)
3614 {
3615 genl_unregister_family(&ip_vs_genl_family);
3616 }
3617
3618 /* End of Generic Netlink interface definitions */
3619
3620 /*
3621 * per netns intit/exit func.
3622 */
3623 #ifdef CONFIG_SYSCTL
ip_vs_control_net_init_sysctl(struct net * net)3624 int __net_init ip_vs_control_net_init_sysctl(struct net *net)
3625 {
3626 int idx;
3627 struct netns_ipvs *ipvs = net_ipvs(net);
3628 struct ctl_table *tbl;
3629
3630 atomic_set(&ipvs->dropentry, 0);
3631 spin_lock_init(&ipvs->dropentry_lock);
3632 spin_lock_init(&ipvs->droppacket_lock);
3633 spin_lock_init(&ipvs->securetcp_lock);
3634
3635 if (!net_eq(net, &init_net)) {
3636 tbl = kmemdup(vs_vars, sizeof(vs_vars), GFP_KERNEL);
3637 if (tbl == NULL)
3638 return -ENOMEM;
3639 } else
3640 tbl = vs_vars;
3641 /* Initialize sysctl defaults */
3642 idx = 0;
3643 ipvs->sysctl_amemthresh = 1024;
3644 tbl[idx++].data = &ipvs->sysctl_amemthresh;
3645 ipvs->sysctl_am_droprate = 10;
3646 tbl[idx++].data = &ipvs->sysctl_am_droprate;
3647 tbl[idx++].data = &ipvs->sysctl_drop_entry;
3648 tbl[idx++].data = &ipvs->sysctl_drop_packet;
3649 #ifdef CONFIG_IP_VS_NFCT
3650 tbl[idx++].data = &ipvs->sysctl_conntrack;
3651 #endif
3652 tbl[idx++].data = &ipvs->sysctl_secure_tcp;
3653 ipvs->sysctl_snat_reroute = 1;
3654 tbl[idx++].data = &ipvs->sysctl_snat_reroute;
3655 ipvs->sysctl_sync_ver = 1;
3656 tbl[idx++].data = &ipvs->sysctl_sync_ver;
3657 tbl[idx++].data = &ipvs->sysctl_cache_bypass;
3658 tbl[idx++].data = &ipvs->sysctl_expire_nodest_conn;
3659 tbl[idx++].data = &ipvs->sysctl_expire_quiescent_template;
3660 ipvs->sysctl_sync_threshold[0] = DEFAULT_SYNC_THRESHOLD;
3661 ipvs->sysctl_sync_threshold[1] = DEFAULT_SYNC_PERIOD;
3662 tbl[idx].data = &ipvs->sysctl_sync_threshold;
3663 tbl[idx++].maxlen = sizeof(ipvs->sysctl_sync_threshold);
3664 tbl[idx++].data = &ipvs->sysctl_nat_icmp_send;
3665
3666
3667 ipvs->sysctl_hdr = register_net_sysctl_table(net, net_vs_ctl_path,
3668 tbl);
3669 if (ipvs->sysctl_hdr == NULL) {
3670 if (!net_eq(net, &init_net))
3671 kfree(tbl);
3672 return -ENOMEM;
3673 }
3674 ip_vs_start_estimator(net, &ipvs->tot_stats);
3675 ipvs->sysctl_tbl = tbl;
3676 /* Schedule defense work */
3677 INIT_DELAYED_WORK(&ipvs->defense_work, defense_work_handler);
3678 schedule_delayed_work(&ipvs->defense_work, DEFENSE_TIMER_PERIOD);
3679
3680 return 0;
3681 }
3682
ip_vs_control_net_cleanup_sysctl(struct net * net)3683 void __net_init ip_vs_control_net_cleanup_sysctl(struct net *net)
3684 {
3685 struct netns_ipvs *ipvs = net_ipvs(net);
3686
3687 cancel_delayed_work_sync(&ipvs->defense_work);
3688 cancel_work_sync(&ipvs->defense_work.work);
3689 unregister_net_sysctl_table(ipvs->sysctl_hdr);
3690 }
3691
3692 #else
3693
ip_vs_control_net_init_sysctl(struct net * net)3694 int __net_init ip_vs_control_net_init_sysctl(struct net *net) { return 0; }
ip_vs_control_net_cleanup_sysctl(struct net * net)3695 void __net_init ip_vs_control_net_cleanup_sysctl(struct net *net) { }
3696
3697 #endif
3698
3699 static struct notifier_block ip_vs_dst_notifier = {
3700 .notifier_call = ip_vs_dst_event,
3701 };
3702
ip_vs_control_net_init(struct net * net)3703 int __net_init ip_vs_control_net_init(struct net *net)
3704 {
3705 int idx;
3706 struct netns_ipvs *ipvs = net_ipvs(net);
3707
3708 rwlock_init(&ipvs->rs_lock);
3709
3710 /* Initialize rs_table */
3711 for (idx = 0; idx < IP_VS_RTAB_SIZE; idx++)
3712 INIT_LIST_HEAD(&ipvs->rs_table[idx]);
3713
3714 INIT_LIST_HEAD(&ipvs->dest_trash);
3715 atomic_set(&ipvs->ftpsvc_counter, 0);
3716 atomic_set(&ipvs->nullsvc_counter, 0);
3717
3718 /* procfs stats */
3719 ipvs->tot_stats.cpustats = alloc_percpu(struct ip_vs_cpu_stats);
3720 if (!ipvs->tot_stats.cpustats)
3721 return -ENOMEM;
3722
3723 spin_lock_init(&ipvs->tot_stats.lock);
3724
3725 proc_net_fops_create(net, "ip_vs", 0, &ip_vs_info_fops);
3726 proc_net_fops_create(net, "ip_vs_stats", 0, &ip_vs_stats_fops);
3727 proc_net_fops_create(net, "ip_vs_stats_percpu", 0,
3728 &ip_vs_stats_percpu_fops);
3729
3730 if (ip_vs_control_net_init_sysctl(net))
3731 goto err;
3732
3733 return 0;
3734
3735 err:
3736 free_percpu(ipvs->tot_stats.cpustats);
3737 return -ENOMEM;
3738 }
3739
ip_vs_control_net_cleanup(struct net * net)3740 void __net_exit ip_vs_control_net_cleanup(struct net *net)
3741 {
3742 struct netns_ipvs *ipvs = net_ipvs(net);
3743
3744 ip_vs_trash_cleanup(net);
3745 ip_vs_stop_estimator(net, &ipvs->tot_stats);
3746 ip_vs_control_net_cleanup_sysctl(net);
3747 proc_net_remove(net, "ip_vs_stats_percpu");
3748 proc_net_remove(net, "ip_vs_stats");
3749 proc_net_remove(net, "ip_vs");
3750 free_percpu(ipvs->tot_stats.cpustats);
3751 }
3752
ip_vs_control_init(void)3753 int __init ip_vs_control_init(void)
3754 {
3755 int idx;
3756 int ret;
3757
3758 EnterFunction(2);
3759
3760 /* Initialize svc_table, ip_vs_svc_fwm_table, rs_table */
3761 for(idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
3762 INIT_LIST_HEAD(&ip_vs_svc_table[idx]);
3763 INIT_LIST_HEAD(&ip_vs_svc_fwm_table[idx]);
3764 }
3765
3766 smp_wmb(); /* Do we really need it now ? */
3767
3768 ret = nf_register_sockopt(&ip_vs_sockopts);
3769 if (ret) {
3770 pr_err("cannot register sockopt.\n");
3771 goto err_sock;
3772 }
3773
3774 ret = ip_vs_genl_register();
3775 if (ret) {
3776 pr_err("cannot register Generic Netlink interface.\n");
3777 goto err_genl;
3778 }
3779
3780 ret = register_netdevice_notifier(&ip_vs_dst_notifier);
3781 if (ret < 0)
3782 goto err_notf;
3783
3784 LeaveFunction(2);
3785 return 0;
3786
3787 err_notf:
3788 ip_vs_genl_unregister();
3789 err_genl:
3790 nf_unregister_sockopt(&ip_vs_sockopts);
3791 err_sock:
3792 return ret;
3793 }
3794
3795
ip_vs_control_cleanup(void)3796 void ip_vs_control_cleanup(void)
3797 {
3798 EnterFunction(2);
3799 unregister_netdevice_notifier(&ip_vs_dst_notifier);
3800 ip_vs_genl_unregister();
3801 nf_unregister_sockopt(&ip_vs_sockopts);
3802 LeaveFunction(2);
3803 }
3804