1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * IPVS An implementation of the IP virtual server support for the
4 * LINUX operating system. IPVS is now implemented as a module
5 * over the NetFilter framework. IPVS can be used to build a
6 * high-performance and highly available server based on a
7 * cluster of servers.
8 *
9 * Authors: Wensong Zhang <wensong@linuxvirtualserver.org>
10 * Peter Kese <peter.kese@ijs.si>
11 * Julian Anastasov <ja@ssi.bg>
12 *
13 * Changes:
14 */
15
16 #define pr_fmt(fmt) "IPVS: " fmt
17
18 #include <linux/module.h>
19 #include <linux/init.h>
20 #include <linux/types.h>
21 #include <linux/capability.h>
22 #include <linux/fs.h>
23 #include <linux/sysctl.h>
24 #include <linux/proc_fs.h>
25 #include <linux/workqueue.h>
26 #include <linux/seq_file.h>
27 #include <linux/slab.h>
28
29 #include <linux/netfilter.h>
30 #include <linux/netfilter_ipv4.h>
31 #include <linux/mutex.h>
32
33 #include <net/net_namespace.h>
34 #include <linux/nsproxy.h>
35 #include <net/ip.h>
36 #ifdef CONFIG_IP_VS_IPV6
37 #include <net/ipv6.h>
38 #include <net/ip6_route.h>
39 #include <net/netfilter/ipv6/nf_defrag_ipv6.h>
40 #endif
41 #include <net/route.h>
42 #include <net/sock.h>
43 #include <net/genetlink.h>
44
45 #include <linux/uaccess.h>
46
47 #include <net/ip_vs.h>
48
49 MODULE_ALIAS_GENL_FAMILY(IPVS_GENL_NAME);
50
51 DEFINE_MUTEX(__ip_vs_mutex); /* Serialize configuration with sockopt/netlink */
52
53 /* sysctl variables */
54
55 #ifdef CONFIG_IP_VS_DEBUG
56 static int sysctl_ip_vs_debug_level = 0;
57
ip_vs_get_debug_level(void)58 int ip_vs_get_debug_level(void)
59 {
60 return sysctl_ip_vs_debug_level;
61 }
62 #endif
63
64
65 /* Protos */
66 static void __ip_vs_del_service(struct ip_vs_service *svc, bool cleanup);
67
68
69 #ifdef CONFIG_IP_VS_IPV6
70 /* 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)71 static bool __ip_vs_addr_is_local_v6(struct net *net,
72 const struct in6_addr *addr)
73 {
74 struct flowi6 fl6 = {
75 .daddr = *addr,
76 };
77 struct dst_entry *dst = ip6_route_output(net, NULL, &fl6);
78 bool is_local;
79
80 is_local = !dst->error && dst->dev && (dst->dev->flags & IFF_LOOPBACK);
81
82 dst_release(dst);
83 return is_local;
84 }
85 #endif
86
87 #ifdef CONFIG_SYSCTL
88 /*
89 * update_defense_level is called from keventd and from sysctl,
90 * so it needs to protect itself from softirqs
91 */
update_defense_level(struct netns_ipvs * ipvs)92 static void update_defense_level(struct netns_ipvs *ipvs)
93 {
94 struct sysinfo i;
95 int availmem;
96 int amemthresh;
97 int nomem;
98 int to_change = -1;
99
100 /* we only count free and buffered memory (in pages) */
101 si_meminfo(&i);
102 availmem = i.freeram + i.bufferram;
103 /* however in linux 2.5 the i.bufferram is total page cache size,
104 we need adjust it */
105 /* si_swapinfo(&i); */
106 /* availmem = availmem - (i.totalswap - i.freeswap); */
107
108 amemthresh = max(READ_ONCE(ipvs->sysctl_amemthresh), 0);
109 nomem = (availmem < amemthresh);
110
111 local_bh_disable();
112
113 /* drop_entry */
114 spin_lock(&ipvs->dropentry_lock);
115 switch (ipvs->sysctl_drop_entry) {
116 case 0:
117 atomic_set(&ipvs->dropentry, 0);
118 break;
119 case 1:
120 if (nomem) {
121 atomic_set(&ipvs->dropentry, 1);
122 ipvs->sysctl_drop_entry = 2;
123 } else {
124 atomic_set(&ipvs->dropentry, 0);
125 }
126 break;
127 case 2:
128 if (nomem) {
129 atomic_set(&ipvs->dropentry, 1);
130 } else {
131 atomic_set(&ipvs->dropentry, 0);
132 ipvs->sysctl_drop_entry = 1;
133 }
134 break;
135 case 3:
136 atomic_set(&ipvs->dropentry, 1);
137 break;
138 }
139 spin_unlock(&ipvs->dropentry_lock);
140
141 /* drop_packet */
142 spin_lock(&ipvs->droppacket_lock);
143 switch (ipvs->sysctl_drop_packet) {
144 case 0:
145 ipvs->drop_rate = 0;
146 break;
147 case 1:
148 if (nomem) {
149 ipvs->drop_counter = amemthresh / (amemthresh - availmem);
150 ipvs->drop_rate = ipvs->drop_counter;
151 ipvs->sysctl_drop_packet = 2;
152 } else {
153 ipvs->drop_rate = 0;
154 }
155 break;
156 case 2:
157 if (nomem) {
158 ipvs->drop_counter = amemthresh / (amemthresh - availmem);
159 ipvs->drop_rate = ipvs->drop_counter;
160 } else {
161 ipvs->drop_rate = 0;
162 ipvs->sysctl_drop_packet = 1;
163 }
164 break;
165 case 3:
166 ipvs->drop_rate = ipvs->sysctl_am_droprate;
167 break;
168 }
169 spin_unlock(&ipvs->droppacket_lock);
170
171 /* secure_tcp */
172 spin_lock(&ipvs->securetcp_lock);
173 switch (ipvs->sysctl_secure_tcp) {
174 case 0:
175 if (ipvs->old_secure_tcp >= 2)
176 to_change = 0;
177 break;
178 case 1:
179 if (nomem) {
180 if (ipvs->old_secure_tcp < 2)
181 to_change = 1;
182 ipvs->sysctl_secure_tcp = 2;
183 } else {
184 if (ipvs->old_secure_tcp >= 2)
185 to_change = 0;
186 }
187 break;
188 case 2:
189 if (nomem) {
190 if (ipvs->old_secure_tcp < 2)
191 to_change = 1;
192 } else {
193 if (ipvs->old_secure_tcp >= 2)
194 to_change = 0;
195 ipvs->sysctl_secure_tcp = 1;
196 }
197 break;
198 case 3:
199 if (ipvs->old_secure_tcp < 2)
200 to_change = 1;
201 break;
202 }
203 ipvs->old_secure_tcp = ipvs->sysctl_secure_tcp;
204 if (to_change >= 0)
205 ip_vs_protocol_timeout_change(ipvs,
206 ipvs->sysctl_secure_tcp > 1);
207 spin_unlock(&ipvs->securetcp_lock);
208
209 local_bh_enable();
210 }
211
212 /* Handler for delayed work for expiring no
213 * destination connections
214 */
expire_nodest_conn_handler(struct work_struct * work)215 static void expire_nodest_conn_handler(struct work_struct *work)
216 {
217 struct netns_ipvs *ipvs;
218
219 ipvs = container_of(work, struct netns_ipvs,
220 expire_nodest_conn_work.work);
221 ip_vs_expire_nodest_conn_flush(ipvs);
222 }
223
224 /*
225 * Timer for checking the defense
226 */
227 #define DEFENSE_TIMER_PERIOD 1*HZ
228
defense_work_handler(struct work_struct * work)229 static void defense_work_handler(struct work_struct *work)
230 {
231 struct netns_ipvs *ipvs =
232 container_of(work, struct netns_ipvs, defense_work.work);
233
234 update_defense_level(ipvs);
235 if (atomic_read(&ipvs->dropentry))
236 ip_vs_random_dropentry(ipvs);
237 queue_delayed_work(system_long_wq, &ipvs->defense_work,
238 DEFENSE_TIMER_PERIOD);
239 }
240 #endif
241
est_reload_work_handler(struct work_struct * work)242 static void est_reload_work_handler(struct work_struct *work)
243 {
244 struct netns_ipvs *ipvs =
245 container_of(work, struct netns_ipvs, est_reload_work.work);
246 int genid_done = atomic_read(&ipvs->est_genid_done);
247 unsigned long delay = HZ / 10; /* repeat startups after failure */
248 bool repeat = false;
249 int genid;
250 int id;
251
252 mutex_lock(&ipvs->est_mutex);
253 genid = atomic_read(&ipvs->est_genid);
254 for (id = 0; id < ipvs->est_kt_count; id++) {
255 struct ip_vs_est_kt_data *kd = ipvs->est_kt_arr[id];
256
257 /* netns clean up started, abort delayed work */
258 if (!READ_ONCE(ipvs->enable))
259 goto unlock;
260 if (!kd)
261 continue;
262 /* New config ? Stop kthread tasks */
263 if (genid != genid_done)
264 ip_vs_est_kthread_stop(kd);
265 if (!kd->task && !ip_vs_est_stopped(ipvs)) {
266 /* Do not start kthreads above 0 in calc phase */
267 if ((!id || !ipvs->est_calc_phase) &&
268 ip_vs_est_kthread_start(ipvs, kd) < 0)
269 repeat = true;
270 }
271 }
272
273 atomic_set(&ipvs->est_genid_done, genid);
274
275 if (repeat)
276 queue_delayed_work(system_long_wq, &ipvs->est_reload_work,
277 delay);
278
279 unlock:
280 mutex_unlock(&ipvs->est_mutex);
281 }
282
283 int
ip_vs_use_count_inc(void)284 ip_vs_use_count_inc(void)
285 {
286 return try_module_get(THIS_MODULE);
287 }
288
289 void
ip_vs_use_count_dec(void)290 ip_vs_use_count_dec(void)
291 {
292 module_put(THIS_MODULE);
293 }
294
295
296 /*
297 * Hash table: for virtual service lookups
298 */
299 #define IP_VS_SVC_TAB_BITS 8
300 #define IP_VS_SVC_TAB_SIZE (1 << IP_VS_SVC_TAB_BITS)
301 #define IP_VS_SVC_TAB_MASK (IP_VS_SVC_TAB_SIZE - 1)
302
303 /* the service table hashed by <protocol, addr, port> */
304 static struct hlist_head ip_vs_svc_table[IP_VS_SVC_TAB_SIZE];
305 /* the service table hashed by fwmark */
306 static struct hlist_head ip_vs_svc_fwm_table[IP_VS_SVC_TAB_SIZE];
307
308
309 /*
310 * Returns hash value for virtual service
311 */
312 static inline unsigned int
ip_vs_svc_hashkey(struct netns_ipvs * ipvs,int af,unsigned int proto,const union nf_inet_addr * addr,__be16 port)313 ip_vs_svc_hashkey(struct netns_ipvs *ipvs, int af, unsigned int proto,
314 const union nf_inet_addr *addr, __be16 port)
315 {
316 unsigned int porth = ntohs(port);
317 __be32 addr_fold = addr->ip;
318 __u32 ahash;
319
320 #ifdef CONFIG_IP_VS_IPV6
321 if (af == AF_INET6)
322 addr_fold = addr->ip6[0]^addr->ip6[1]^
323 addr->ip6[2]^addr->ip6[3];
324 #endif
325 ahash = ntohl(addr_fold);
326 ahash ^= ((size_t) ipvs >> 8);
327
328 return (proto ^ ahash ^ (porth >> IP_VS_SVC_TAB_BITS) ^ porth) &
329 IP_VS_SVC_TAB_MASK;
330 }
331
332 /*
333 * Returns hash value of fwmark for virtual service lookup
334 */
ip_vs_svc_fwm_hashkey(struct netns_ipvs * ipvs,__u32 fwmark)335 static inline unsigned int ip_vs_svc_fwm_hashkey(struct netns_ipvs *ipvs, __u32 fwmark)
336 {
337 return (((size_t)ipvs>>8) ^ fwmark) & IP_VS_SVC_TAB_MASK;
338 }
339
340 /*
341 * Hashes a service in the ip_vs_svc_table by <netns,proto,addr,port>
342 * or in the ip_vs_svc_fwm_table by fwmark.
343 * Should be called with locked tables.
344 */
ip_vs_svc_hash(struct ip_vs_service * svc)345 static int ip_vs_svc_hash(struct ip_vs_service *svc)
346 {
347 unsigned int hash;
348
349 if (svc->flags & IP_VS_SVC_F_HASHED) {
350 pr_err("%s(): request for already hashed, called from %pS\n",
351 __func__, __builtin_return_address(0));
352 return 0;
353 }
354
355 if (svc->fwmark == 0) {
356 /*
357 * Hash it by <netns,protocol,addr,port> in ip_vs_svc_table
358 */
359 hash = ip_vs_svc_hashkey(svc->ipvs, svc->af, svc->protocol,
360 &svc->addr, svc->port);
361 hlist_add_head_rcu(&svc->s_list, &ip_vs_svc_table[hash]);
362 } else {
363 /*
364 * Hash it by fwmark in svc_fwm_table
365 */
366 hash = ip_vs_svc_fwm_hashkey(svc->ipvs, svc->fwmark);
367 hlist_add_head_rcu(&svc->f_list, &ip_vs_svc_fwm_table[hash]);
368 }
369
370 svc->flags |= IP_VS_SVC_F_HASHED;
371 /* increase its refcnt because it is referenced by the svc table */
372 atomic_inc(&svc->refcnt);
373 return 1;
374 }
375
376
377 /*
378 * Unhashes a service from svc_table / svc_fwm_table.
379 * Should be called with locked tables.
380 */
ip_vs_svc_unhash(struct ip_vs_service * svc)381 static int ip_vs_svc_unhash(struct ip_vs_service *svc)
382 {
383 if (!(svc->flags & IP_VS_SVC_F_HASHED)) {
384 pr_err("%s(): request for unhash flagged, called from %pS\n",
385 __func__, __builtin_return_address(0));
386 return 0;
387 }
388
389 if (svc->fwmark == 0) {
390 /* Remove it from the svc_table table */
391 hlist_del_rcu(&svc->s_list);
392 } else {
393 /* Remove it from the svc_fwm_table table */
394 hlist_del_rcu(&svc->f_list);
395 }
396
397 svc->flags &= ~IP_VS_SVC_F_HASHED;
398 atomic_dec(&svc->refcnt);
399 return 1;
400 }
401
402
403 /*
404 * Get service by {netns, proto,addr,port} in the service table.
405 */
406 static inline struct ip_vs_service *
__ip_vs_service_find(struct netns_ipvs * ipvs,int af,__u16 protocol,const union nf_inet_addr * vaddr,__be16 vport)407 __ip_vs_service_find(struct netns_ipvs *ipvs, int af, __u16 protocol,
408 const union nf_inet_addr *vaddr, __be16 vport)
409 {
410 unsigned int hash;
411 struct ip_vs_service *svc;
412
413 /* Check for "full" addressed entries */
414 hash = ip_vs_svc_hashkey(ipvs, af, protocol, vaddr, vport);
415
416 hlist_for_each_entry_rcu(svc, &ip_vs_svc_table[hash], s_list) {
417 if ((svc->af == af)
418 && ip_vs_addr_equal(af, &svc->addr, vaddr)
419 && (svc->port == vport)
420 && (svc->protocol == protocol)
421 && (svc->ipvs == ipvs)) {
422 /* HIT */
423 return svc;
424 }
425 }
426
427 return NULL;
428 }
429
430
431 /*
432 * Get service by {fwmark} in the service table.
433 */
434 static inline struct ip_vs_service *
__ip_vs_svc_fwm_find(struct netns_ipvs * ipvs,int af,__u32 fwmark)435 __ip_vs_svc_fwm_find(struct netns_ipvs *ipvs, int af, __u32 fwmark)
436 {
437 unsigned int hash;
438 struct ip_vs_service *svc;
439
440 /* Check for fwmark addressed entries */
441 hash = ip_vs_svc_fwm_hashkey(ipvs, fwmark);
442
443 hlist_for_each_entry_rcu(svc, &ip_vs_svc_fwm_table[hash], f_list) {
444 if (svc->fwmark == fwmark && svc->af == af
445 && (svc->ipvs == ipvs)) {
446 /* HIT */
447 return svc;
448 }
449 }
450
451 return NULL;
452 }
453
454 /* Find service, called under RCU lock */
455 struct ip_vs_service *
ip_vs_service_find(struct netns_ipvs * ipvs,int af,__u32 fwmark,__u16 protocol,const union nf_inet_addr * vaddr,__be16 vport)456 ip_vs_service_find(struct netns_ipvs *ipvs, int af, __u32 fwmark, __u16 protocol,
457 const union nf_inet_addr *vaddr, __be16 vport)
458 {
459 struct ip_vs_service *svc;
460
461 /*
462 * Check the table hashed by fwmark first
463 */
464 if (fwmark) {
465 svc = __ip_vs_svc_fwm_find(ipvs, af, fwmark);
466 if (svc)
467 goto out;
468 }
469
470 /*
471 * Check the table hashed by <protocol,addr,port>
472 * for "full" addressed entries
473 */
474 svc = __ip_vs_service_find(ipvs, af, protocol, vaddr, vport);
475
476 if (!svc && protocol == IPPROTO_TCP &&
477 atomic_read(&ipvs->ftpsvc_counter) &&
478 (vport == FTPDATA || !inet_port_requires_bind_service(ipvs->net, ntohs(vport)))) {
479 /*
480 * Check if ftp service entry exists, the packet
481 * might belong to FTP data connections.
482 */
483 svc = __ip_vs_service_find(ipvs, af, protocol, vaddr, FTPPORT);
484 }
485
486 if (svc == NULL
487 && atomic_read(&ipvs->nullsvc_counter)) {
488 /*
489 * Check if the catch-all port (port zero) exists
490 */
491 svc = __ip_vs_service_find(ipvs, af, protocol, vaddr, 0);
492 }
493
494 out:
495 IP_VS_DBG_BUF(9, "lookup service: fwm %u %s %s:%u %s\n",
496 fwmark, ip_vs_proto_name(protocol),
497 IP_VS_DBG_ADDR(af, vaddr), ntohs(vport),
498 svc ? "hit" : "not hit");
499
500 return svc;
501 }
502
503
504 static inline void
__ip_vs_bind_svc(struct ip_vs_dest * dest,struct ip_vs_service * svc)505 __ip_vs_bind_svc(struct ip_vs_dest *dest, struct ip_vs_service *svc)
506 {
507 atomic_inc(&svc->refcnt);
508 rcu_assign_pointer(dest->svc, svc);
509 }
510
ip_vs_service_free(struct ip_vs_service * svc)511 static void ip_vs_service_free(struct ip_vs_service *svc)
512 {
513 ip_vs_stats_release(&svc->stats);
514 kfree(svc);
515 }
516
ip_vs_service_rcu_free(struct rcu_head * head)517 static void ip_vs_service_rcu_free(struct rcu_head *head)
518 {
519 struct ip_vs_service *svc;
520
521 svc = container_of(head, struct ip_vs_service, rcu_head);
522 ip_vs_service_free(svc);
523 }
524
__ip_vs_svc_put(struct ip_vs_service * svc)525 static void __ip_vs_svc_put(struct ip_vs_service *svc)
526 {
527 if (atomic_dec_and_test(&svc->refcnt)) {
528 IP_VS_DBG_BUF(3, "Removing service %u/%s:%u\n",
529 svc->fwmark,
530 IP_VS_DBG_ADDR(svc->af, &svc->addr),
531 ntohs(svc->port));
532 call_rcu(&svc->rcu_head, ip_vs_service_rcu_free);
533 }
534 }
535
536
537 /*
538 * Returns hash value for real service
539 */
ip_vs_rs_hashkey(int af,const union nf_inet_addr * addr,__be16 port)540 static inline unsigned int ip_vs_rs_hashkey(int af,
541 const union nf_inet_addr *addr,
542 __be16 port)
543 {
544 unsigned int porth = ntohs(port);
545 __be32 addr_fold = addr->ip;
546
547 #ifdef CONFIG_IP_VS_IPV6
548 if (af == AF_INET6)
549 addr_fold = addr->ip6[0]^addr->ip6[1]^
550 addr->ip6[2]^addr->ip6[3];
551 #endif
552
553 return (ntohl(addr_fold)^(porth>>IP_VS_RTAB_BITS)^porth)
554 & IP_VS_RTAB_MASK;
555 }
556
557 /* Hash ip_vs_dest in rs_table by <proto,addr,port>. */
ip_vs_rs_hash(struct netns_ipvs * ipvs,struct ip_vs_dest * dest)558 static void ip_vs_rs_hash(struct netns_ipvs *ipvs, struct ip_vs_dest *dest)
559 {
560 unsigned int hash;
561 __be16 port;
562
563 if (dest->in_rs_table)
564 return;
565
566 switch (IP_VS_DFWD_METHOD(dest)) {
567 case IP_VS_CONN_F_MASQ:
568 port = dest->port;
569 break;
570 case IP_VS_CONN_F_TUNNEL:
571 switch (dest->tun_type) {
572 case IP_VS_CONN_F_TUNNEL_TYPE_GUE:
573 port = dest->tun_port;
574 break;
575 case IP_VS_CONN_F_TUNNEL_TYPE_IPIP:
576 case IP_VS_CONN_F_TUNNEL_TYPE_GRE:
577 port = 0;
578 break;
579 default:
580 return;
581 }
582 break;
583 default:
584 return;
585 }
586
587 /*
588 * Hash by proto,addr,port,
589 * which are the parameters of the real service.
590 */
591 hash = ip_vs_rs_hashkey(dest->af, &dest->addr, port);
592
593 hlist_add_head_rcu(&dest->d_list, &ipvs->rs_table[hash]);
594 dest->in_rs_table = 1;
595 }
596
597 /* Unhash ip_vs_dest from rs_table. */
ip_vs_rs_unhash(struct ip_vs_dest * dest)598 static void ip_vs_rs_unhash(struct ip_vs_dest *dest)
599 {
600 /*
601 * Remove it from the rs_table table.
602 */
603 if (dest->in_rs_table) {
604 hlist_del_rcu(&dest->d_list);
605 dest->in_rs_table = 0;
606 }
607 }
608
609 /* Check if real service by <proto,addr,port> is present */
ip_vs_has_real_service(struct netns_ipvs * ipvs,int af,__u16 protocol,const union nf_inet_addr * daddr,__be16 dport)610 bool ip_vs_has_real_service(struct netns_ipvs *ipvs, int af, __u16 protocol,
611 const union nf_inet_addr *daddr, __be16 dport)
612 {
613 unsigned int hash;
614 struct ip_vs_dest *dest;
615
616 /* Check for "full" addressed entries */
617 hash = ip_vs_rs_hashkey(af, daddr, dport);
618
619 hlist_for_each_entry_rcu(dest, &ipvs->rs_table[hash], d_list) {
620 if (dest->port == dport &&
621 dest->af == af &&
622 ip_vs_addr_equal(af, &dest->addr, daddr) &&
623 (dest->protocol == protocol || dest->vfwmark) &&
624 IP_VS_DFWD_METHOD(dest) == IP_VS_CONN_F_MASQ) {
625 /* HIT */
626 return true;
627 }
628 }
629
630 return false;
631 }
632
633 /* Find real service record by <proto,addr,port>.
634 * In case of multiple records with the same <proto,addr,port>, only
635 * the first found record is returned.
636 *
637 * To be called under RCU lock.
638 */
ip_vs_find_real_service(struct netns_ipvs * ipvs,int af,__u16 protocol,const union nf_inet_addr * daddr,__be16 dport)639 struct ip_vs_dest *ip_vs_find_real_service(struct netns_ipvs *ipvs, int af,
640 __u16 protocol,
641 const union nf_inet_addr *daddr,
642 __be16 dport)
643 {
644 unsigned int hash;
645 struct ip_vs_dest *dest;
646
647 /* Check for "full" addressed entries */
648 hash = ip_vs_rs_hashkey(af, daddr, dport);
649
650 hlist_for_each_entry_rcu(dest, &ipvs->rs_table[hash], d_list) {
651 if (dest->port == dport &&
652 dest->af == af &&
653 ip_vs_addr_equal(af, &dest->addr, daddr) &&
654 (dest->protocol == protocol || dest->vfwmark) &&
655 IP_VS_DFWD_METHOD(dest) == IP_VS_CONN_F_MASQ) {
656 /* HIT */
657 return dest;
658 }
659 }
660
661 return NULL;
662 }
663
664 /* Find real service record by <af,addr,tun_port>.
665 * In case of multiple records with the same <af,addr,tun_port>, only
666 * the first found record is returned.
667 *
668 * To be called under RCU lock.
669 */
ip_vs_find_tunnel(struct netns_ipvs * ipvs,int af,const union nf_inet_addr * daddr,__be16 tun_port)670 struct ip_vs_dest *ip_vs_find_tunnel(struct netns_ipvs *ipvs, int af,
671 const union nf_inet_addr *daddr,
672 __be16 tun_port)
673 {
674 struct ip_vs_dest *dest;
675 unsigned int hash;
676
677 /* Check for "full" addressed entries */
678 hash = ip_vs_rs_hashkey(af, daddr, tun_port);
679
680 hlist_for_each_entry_rcu(dest, &ipvs->rs_table[hash], d_list) {
681 if (dest->tun_port == tun_port &&
682 dest->af == af &&
683 ip_vs_addr_equal(af, &dest->addr, daddr) &&
684 IP_VS_DFWD_METHOD(dest) == IP_VS_CONN_F_TUNNEL) {
685 /* HIT */
686 return dest;
687 }
688 }
689
690 return NULL;
691 }
692
693 /* Lookup destination by {addr,port} in the given service
694 * Called under RCU lock.
695 */
696 static struct ip_vs_dest *
ip_vs_lookup_dest(struct ip_vs_service * svc,int dest_af,const union nf_inet_addr * daddr,__be16 dport)697 ip_vs_lookup_dest(struct ip_vs_service *svc, int dest_af,
698 const union nf_inet_addr *daddr, __be16 dport)
699 {
700 struct ip_vs_dest *dest;
701
702 /*
703 * Find the destination for the given service
704 */
705 list_for_each_entry_rcu(dest, &svc->destinations, n_list) {
706 if ((dest->af == dest_af) &&
707 ip_vs_addr_equal(dest_af, &dest->addr, daddr) &&
708 (dest->port == dport)) {
709 /* HIT */
710 return dest;
711 }
712 }
713
714 return NULL;
715 }
716
717 /*
718 * Find destination by {daddr,dport,vaddr,protocol}
719 * Created to be used in ip_vs_process_message() in
720 * the backup synchronization daemon. It finds the
721 * destination to be bound to the received connection
722 * on the backup.
723 * Called under RCU lock, no refcnt is returned.
724 */
ip_vs_find_dest(struct netns_ipvs * ipvs,int svc_af,int dest_af,const union nf_inet_addr * daddr,__be16 dport,const union nf_inet_addr * vaddr,__be16 vport,__u16 protocol,__u32 fwmark,__u32 flags)725 struct ip_vs_dest *ip_vs_find_dest(struct netns_ipvs *ipvs, int svc_af, int dest_af,
726 const union nf_inet_addr *daddr,
727 __be16 dport,
728 const union nf_inet_addr *vaddr,
729 __be16 vport, __u16 protocol, __u32 fwmark,
730 __u32 flags)
731 {
732 struct ip_vs_dest *dest;
733 struct ip_vs_service *svc;
734 __be16 port = dport;
735
736 svc = ip_vs_service_find(ipvs, svc_af, fwmark, protocol, vaddr, vport);
737 if (!svc)
738 return NULL;
739 if (fwmark && (flags & IP_VS_CONN_F_FWD_MASK) != IP_VS_CONN_F_MASQ)
740 port = 0;
741 dest = ip_vs_lookup_dest(svc, dest_af, daddr, port);
742 if (!dest)
743 dest = ip_vs_lookup_dest(svc, dest_af, daddr, port ^ dport);
744 return dest;
745 }
746
ip_vs_dest_dst_rcu_free(struct rcu_head * head)747 void ip_vs_dest_dst_rcu_free(struct rcu_head *head)
748 {
749 struct ip_vs_dest_dst *dest_dst = container_of(head,
750 struct ip_vs_dest_dst,
751 rcu_head);
752
753 dst_release(dest_dst->dst_cache);
754 kfree(dest_dst);
755 }
756
757 /* Release dest_dst and dst_cache for dest in user context */
__ip_vs_dst_cache_reset(struct ip_vs_dest * dest)758 static void __ip_vs_dst_cache_reset(struct ip_vs_dest *dest)
759 {
760 struct ip_vs_dest_dst *old;
761
762 old = rcu_dereference_protected(dest->dest_dst, 1);
763 if (old) {
764 RCU_INIT_POINTER(dest->dest_dst, NULL);
765 call_rcu(&old->rcu_head, ip_vs_dest_dst_rcu_free);
766 }
767 }
768
769 /*
770 * Lookup dest by {svc,addr,port} in the destination trash.
771 * The destination trash is used to hold the destinations that are removed
772 * from the service table but are still referenced by some conn entries.
773 * The reason to add the destination trash is when the dest is temporary
774 * down (either by administrator or by monitor program), the dest can be
775 * picked back from the trash, the remaining connections to the dest can
776 * continue, and the counting information of the dest is also useful for
777 * scheduling.
778 */
779 static struct ip_vs_dest *
ip_vs_trash_get_dest(struct ip_vs_service * svc,int dest_af,const union nf_inet_addr * daddr,__be16 dport)780 ip_vs_trash_get_dest(struct ip_vs_service *svc, int dest_af,
781 const union nf_inet_addr *daddr, __be16 dport)
782 {
783 struct ip_vs_dest *dest;
784 struct netns_ipvs *ipvs = svc->ipvs;
785
786 /*
787 * Find the destination in trash
788 */
789 spin_lock_bh(&ipvs->dest_trash_lock);
790 list_for_each_entry(dest, &ipvs->dest_trash, t_list) {
791 IP_VS_DBG_BUF(3, "Destination %u/%s:%u still in trash, "
792 "dest->refcnt=%d\n",
793 dest->vfwmark,
794 IP_VS_DBG_ADDR(dest->af, &dest->addr),
795 ntohs(dest->port),
796 refcount_read(&dest->refcnt));
797 if (dest->af == dest_af &&
798 ip_vs_addr_equal(dest_af, &dest->addr, daddr) &&
799 dest->port == dport &&
800 dest->vfwmark == svc->fwmark &&
801 dest->protocol == svc->protocol &&
802 (svc->fwmark ||
803 (ip_vs_addr_equal(svc->af, &dest->vaddr, &svc->addr) &&
804 dest->vport == svc->port))) {
805 /* HIT */
806 list_del(&dest->t_list);
807 goto out;
808 }
809 }
810
811 dest = NULL;
812
813 out:
814 spin_unlock_bh(&ipvs->dest_trash_lock);
815
816 return dest;
817 }
818
ip_vs_dest_rcu_free(struct rcu_head * head)819 static void ip_vs_dest_rcu_free(struct rcu_head *head)
820 {
821 struct ip_vs_dest *dest;
822
823 dest = container_of(head, struct ip_vs_dest, rcu_head);
824 ip_vs_stats_release(&dest->stats);
825 ip_vs_dest_put_and_free(dest);
826 }
827
ip_vs_dest_free(struct ip_vs_dest * dest)828 static void ip_vs_dest_free(struct ip_vs_dest *dest)
829 {
830 struct ip_vs_service *svc = rcu_dereference_protected(dest->svc, 1);
831
832 __ip_vs_dst_cache_reset(dest);
833 __ip_vs_svc_put(svc);
834 call_rcu(&dest->rcu_head, ip_vs_dest_rcu_free);
835 }
836
837 /*
838 * Clean up all the destinations in the trash
839 * Called by the ip_vs_control_cleanup()
840 *
841 * When the ip_vs_control_clearup is activated by ipvs module exit,
842 * the service tables must have been flushed and all the connections
843 * are expired, and the refcnt of each destination in the trash must
844 * be 1, so we simply release them here.
845 */
ip_vs_trash_cleanup(struct netns_ipvs * ipvs)846 static void ip_vs_trash_cleanup(struct netns_ipvs *ipvs)
847 {
848 struct ip_vs_dest *dest, *nxt;
849
850 timer_delete_sync(&ipvs->dest_trash_timer);
851 /* No need to use dest_trash_lock */
852 list_for_each_entry_safe(dest, nxt, &ipvs->dest_trash, t_list) {
853 list_del(&dest->t_list);
854 ip_vs_dest_free(dest);
855 }
856 }
857
ip_vs_stats_rcu_free(struct rcu_head * head)858 static void ip_vs_stats_rcu_free(struct rcu_head *head)
859 {
860 struct ip_vs_stats_rcu *rs = container_of(head,
861 struct ip_vs_stats_rcu,
862 rcu_head);
863
864 ip_vs_stats_release(&rs->s);
865 kfree(rs);
866 }
867
868 static void
ip_vs_copy_stats(struct ip_vs_kstats * dst,struct ip_vs_stats * src)869 ip_vs_copy_stats(struct ip_vs_kstats *dst, struct ip_vs_stats *src)
870 {
871 #define IP_VS_SHOW_STATS_COUNTER(c) dst->c = src->kstats.c - src->kstats0.c
872
873 spin_lock(&src->lock);
874
875 IP_VS_SHOW_STATS_COUNTER(conns);
876 IP_VS_SHOW_STATS_COUNTER(inpkts);
877 IP_VS_SHOW_STATS_COUNTER(outpkts);
878 IP_VS_SHOW_STATS_COUNTER(inbytes);
879 IP_VS_SHOW_STATS_COUNTER(outbytes);
880
881 ip_vs_read_estimator(dst, src);
882
883 spin_unlock(&src->lock);
884 }
885
886 static void
ip_vs_export_stats_user(struct ip_vs_stats_user * dst,struct ip_vs_kstats * src)887 ip_vs_export_stats_user(struct ip_vs_stats_user *dst, struct ip_vs_kstats *src)
888 {
889 dst->conns = (u32)src->conns;
890 dst->inpkts = (u32)src->inpkts;
891 dst->outpkts = (u32)src->outpkts;
892 dst->inbytes = src->inbytes;
893 dst->outbytes = src->outbytes;
894 dst->cps = (u32)src->cps;
895 dst->inpps = (u32)src->inpps;
896 dst->outpps = (u32)src->outpps;
897 dst->inbps = (u32)src->inbps;
898 dst->outbps = (u32)src->outbps;
899 }
900
901 static void
ip_vs_zero_stats(struct ip_vs_stats * stats)902 ip_vs_zero_stats(struct ip_vs_stats *stats)
903 {
904 spin_lock(&stats->lock);
905
906 /* get current counters as zero point, rates are zeroed */
907
908 #define IP_VS_ZERO_STATS_COUNTER(c) stats->kstats0.c = stats->kstats.c
909
910 IP_VS_ZERO_STATS_COUNTER(conns);
911 IP_VS_ZERO_STATS_COUNTER(inpkts);
912 IP_VS_ZERO_STATS_COUNTER(outpkts);
913 IP_VS_ZERO_STATS_COUNTER(inbytes);
914 IP_VS_ZERO_STATS_COUNTER(outbytes);
915
916 ip_vs_zero_estimator(stats);
917
918 spin_unlock(&stats->lock);
919 }
920
921 /* Allocate fields after kzalloc */
ip_vs_stats_init_alloc(struct ip_vs_stats * s)922 int ip_vs_stats_init_alloc(struct ip_vs_stats *s)
923 {
924 int i;
925
926 spin_lock_init(&s->lock);
927 s->cpustats = alloc_percpu(struct ip_vs_cpu_stats);
928 if (!s->cpustats)
929 return -ENOMEM;
930
931 for_each_possible_cpu(i) {
932 struct ip_vs_cpu_stats *cs = per_cpu_ptr(s->cpustats, i);
933
934 u64_stats_init(&cs->syncp);
935 }
936 return 0;
937 }
938
ip_vs_stats_alloc(void)939 struct ip_vs_stats *ip_vs_stats_alloc(void)
940 {
941 struct ip_vs_stats *s = kzalloc_obj(*s);
942
943 if (s && ip_vs_stats_init_alloc(s) >= 0)
944 return s;
945 kfree(s);
946 return NULL;
947 }
948
ip_vs_stats_release(struct ip_vs_stats * stats)949 void ip_vs_stats_release(struct ip_vs_stats *stats)
950 {
951 free_percpu(stats->cpustats);
952 }
953
ip_vs_stats_free(struct ip_vs_stats * stats)954 void ip_vs_stats_free(struct ip_vs_stats *stats)
955 {
956 if (stats) {
957 ip_vs_stats_release(stats);
958 kfree(stats);
959 }
960 }
961
962 /*
963 * Update a destination in the given service
964 */
965 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)966 __ip_vs_update_dest(struct ip_vs_service *svc, struct ip_vs_dest *dest,
967 struct ip_vs_dest_user_kern *udest, int add)
968 {
969 struct netns_ipvs *ipvs = svc->ipvs;
970 struct ip_vs_service *old_svc;
971 struct ip_vs_scheduler *sched;
972 int conn_flags;
973
974 /* We cannot modify an address and change the address family */
975 BUG_ON(!add && udest->af != dest->af);
976
977 if (add && udest->af != svc->af)
978 ipvs->mixed_address_family_dests++;
979
980 /* keep the last_weight with latest non-0 weight */
981 if (add || udest->weight != 0)
982 atomic_set(&dest->last_weight, udest->weight);
983
984 /* set the weight and the flags */
985 atomic_set(&dest->weight, udest->weight);
986 conn_flags = udest->conn_flags & IP_VS_CONN_F_DEST_MASK;
987 conn_flags |= IP_VS_CONN_F_INACTIVE;
988
989 /* Need to rehash? */
990 if ((udest->conn_flags & IP_VS_CONN_F_FWD_MASK) !=
991 IP_VS_DFWD_METHOD(dest) ||
992 udest->tun_type != dest->tun_type ||
993 udest->tun_port != dest->tun_port)
994 ip_vs_rs_unhash(dest);
995
996 /* set the tunnel info */
997 dest->tun_type = udest->tun_type;
998 dest->tun_port = udest->tun_port;
999 dest->tun_flags = udest->tun_flags;
1000
1001 /* set the IP_VS_CONN_F_NOOUTPUT flag if not masquerading/NAT */
1002 if ((conn_flags & IP_VS_CONN_F_FWD_MASK) != IP_VS_CONN_F_MASQ) {
1003 conn_flags |= IP_VS_CONN_F_NOOUTPUT;
1004 } else {
1005 /* FTP-NAT requires conntrack for mangling */
1006 if (svc->port == FTPPORT)
1007 ip_vs_register_conntrack(svc);
1008 }
1009 atomic_set(&dest->conn_flags, conn_flags);
1010 /* Put the real service in rs_table if not present. */
1011 ip_vs_rs_hash(ipvs, dest);
1012
1013 /* bind the service */
1014 old_svc = rcu_dereference_protected(dest->svc, 1);
1015 if (!old_svc) {
1016 __ip_vs_bind_svc(dest, svc);
1017 } else {
1018 if (old_svc != svc) {
1019 ip_vs_zero_stats(&dest->stats);
1020 __ip_vs_bind_svc(dest, svc);
1021 __ip_vs_svc_put(old_svc);
1022 }
1023 }
1024
1025 /* set the dest status flags */
1026 dest->flags |= IP_VS_DEST_F_AVAILABLE;
1027
1028 if (udest->u_threshold == 0 || udest->u_threshold > dest->u_threshold)
1029 dest->flags &= ~IP_VS_DEST_F_OVERLOAD;
1030 dest->u_threshold = udest->u_threshold;
1031 dest->l_threshold = udest->l_threshold;
1032
1033 dest->af = udest->af;
1034
1035 spin_lock_bh(&dest->dst_lock);
1036 __ip_vs_dst_cache_reset(dest);
1037 spin_unlock_bh(&dest->dst_lock);
1038
1039 if (add) {
1040 list_add_rcu(&dest->n_list, &svc->destinations);
1041 svc->num_dests++;
1042 sched = rcu_dereference_protected(svc->scheduler, 1);
1043 if (sched && sched->add_dest)
1044 sched->add_dest(svc, dest);
1045 } else {
1046 sched = rcu_dereference_protected(svc->scheduler, 1);
1047 if (sched && sched->upd_dest)
1048 sched->upd_dest(svc, dest);
1049 }
1050 }
1051
1052
1053 /*
1054 * Create a destination for the given service
1055 */
1056 static int
ip_vs_new_dest(struct ip_vs_service * svc,struct ip_vs_dest_user_kern * udest)1057 ip_vs_new_dest(struct ip_vs_service *svc, struct ip_vs_dest_user_kern *udest)
1058 {
1059 struct ip_vs_dest *dest;
1060 unsigned int atype;
1061 int ret;
1062
1063 #ifdef CONFIG_IP_VS_IPV6
1064 if (udest->af == AF_INET6) {
1065 atype = ipv6_addr_type(&udest->addr.in6);
1066 if ((!(atype & IPV6_ADDR_UNICAST) ||
1067 atype & IPV6_ADDR_LINKLOCAL) &&
1068 !__ip_vs_addr_is_local_v6(svc->ipvs->net, &udest->addr.in6))
1069 return -EINVAL;
1070
1071 ret = nf_defrag_ipv6_enable(svc->ipvs->net);
1072 if (ret)
1073 return ret;
1074 } else
1075 #endif
1076 {
1077 atype = inet_addr_type(svc->ipvs->net, udest->addr.ip);
1078 if (atype != RTN_LOCAL && atype != RTN_UNICAST)
1079 return -EINVAL;
1080 }
1081
1082 dest = kzalloc_obj(struct ip_vs_dest);
1083 if (dest == NULL)
1084 return -ENOMEM;
1085
1086 ret = ip_vs_stats_init_alloc(&dest->stats);
1087 if (ret < 0)
1088 goto err_alloc;
1089
1090 ret = ip_vs_start_estimator(svc->ipvs, &dest->stats);
1091 if (ret < 0)
1092 goto err_stats;
1093
1094 dest->af = udest->af;
1095 dest->protocol = svc->protocol;
1096 dest->vaddr = svc->addr;
1097 dest->vport = svc->port;
1098 dest->vfwmark = svc->fwmark;
1099 ip_vs_addr_copy(udest->af, &dest->addr, &udest->addr);
1100 dest->port = udest->port;
1101
1102 atomic_set(&dest->activeconns, 0);
1103 atomic_set(&dest->inactconns, 0);
1104 atomic_set(&dest->persistconns, 0);
1105 refcount_set(&dest->refcnt, 1);
1106
1107 INIT_HLIST_NODE(&dest->d_list);
1108 spin_lock_init(&dest->dst_lock);
1109 __ip_vs_update_dest(svc, dest, udest, 1);
1110
1111 return 0;
1112
1113 err_stats:
1114 ip_vs_stats_release(&dest->stats);
1115
1116 err_alloc:
1117 kfree(dest);
1118 return ret;
1119 }
1120
1121
1122 /*
1123 * Add a destination into an existing service
1124 */
1125 static int
ip_vs_add_dest(struct ip_vs_service * svc,struct ip_vs_dest_user_kern * udest)1126 ip_vs_add_dest(struct ip_vs_service *svc, struct ip_vs_dest_user_kern *udest)
1127 {
1128 struct ip_vs_dest *dest;
1129 union nf_inet_addr daddr;
1130 __be16 dport = udest->port;
1131 int ret;
1132
1133 if (udest->weight < 0) {
1134 pr_err("%s(): server weight less than zero\n", __func__);
1135 return -ERANGE;
1136 }
1137
1138 if (udest->l_threshold > udest->u_threshold) {
1139 pr_err("%s(): lower threshold is higher than upper threshold\n",
1140 __func__);
1141 return -ERANGE;
1142 }
1143
1144 if (udest->tun_type == IP_VS_CONN_F_TUNNEL_TYPE_GUE) {
1145 if (udest->tun_port == 0) {
1146 pr_err("%s(): tunnel port is zero\n", __func__);
1147 return -EINVAL;
1148 }
1149 }
1150
1151 ip_vs_addr_copy(udest->af, &daddr, &udest->addr);
1152
1153 /* We use function that requires RCU lock */
1154 rcu_read_lock();
1155 dest = ip_vs_lookup_dest(svc, udest->af, &daddr, dport);
1156 rcu_read_unlock();
1157
1158 if (dest != NULL) {
1159 IP_VS_DBG(1, "%s(): dest already exists\n", __func__);
1160 return -EEXIST;
1161 }
1162
1163 /*
1164 * Check if the dest already exists in the trash and
1165 * is from the same service
1166 */
1167 dest = ip_vs_trash_get_dest(svc, udest->af, &daddr, dport);
1168
1169 if (dest != NULL) {
1170 IP_VS_DBG_BUF(3, "Get destination %s:%u from trash, "
1171 "dest->refcnt=%d, service %u/%s:%u\n",
1172 IP_VS_DBG_ADDR(udest->af, &daddr), ntohs(dport),
1173 refcount_read(&dest->refcnt),
1174 dest->vfwmark,
1175 IP_VS_DBG_ADDR(svc->af, &dest->vaddr),
1176 ntohs(dest->vport));
1177
1178 ret = ip_vs_start_estimator(svc->ipvs, &dest->stats);
1179 if (ret < 0)
1180 return ret;
1181 __ip_vs_update_dest(svc, dest, udest, 1);
1182 } else {
1183 /*
1184 * Allocate and initialize the dest structure
1185 */
1186 ret = ip_vs_new_dest(svc, udest);
1187 }
1188
1189 return ret;
1190 }
1191
1192
1193 /*
1194 * Edit a destination in the given service
1195 */
1196 static int
ip_vs_edit_dest(struct ip_vs_service * svc,struct ip_vs_dest_user_kern * udest)1197 ip_vs_edit_dest(struct ip_vs_service *svc, struct ip_vs_dest_user_kern *udest)
1198 {
1199 struct ip_vs_dest *dest;
1200 union nf_inet_addr daddr;
1201 __be16 dport = udest->port;
1202
1203 if (udest->weight < 0) {
1204 pr_err("%s(): server weight less than zero\n", __func__);
1205 return -ERANGE;
1206 }
1207
1208 if (udest->l_threshold > udest->u_threshold) {
1209 pr_err("%s(): lower threshold is higher than upper threshold\n",
1210 __func__);
1211 return -ERANGE;
1212 }
1213
1214 if (udest->tun_type == IP_VS_CONN_F_TUNNEL_TYPE_GUE) {
1215 if (udest->tun_port == 0) {
1216 pr_err("%s(): tunnel port is zero\n", __func__);
1217 return -EINVAL;
1218 }
1219 }
1220
1221 ip_vs_addr_copy(udest->af, &daddr, &udest->addr);
1222
1223 /* We use function that requires RCU lock */
1224 rcu_read_lock();
1225 dest = ip_vs_lookup_dest(svc, udest->af, &daddr, dport);
1226 rcu_read_unlock();
1227
1228 if (dest == NULL) {
1229 IP_VS_DBG(1, "%s(): dest doesn't exist\n", __func__);
1230 return -ENOENT;
1231 }
1232
1233 __ip_vs_update_dest(svc, dest, udest, 0);
1234
1235 return 0;
1236 }
1237
1238 /*
1239 * Delete a destination (must be already unlinked from the service)
1240 */
__ip_vs_del_dest(struct netns_ipvs * ipvs,struct ip_vs_dest * dest,bool cleanup)1241 static void __ip_vs_del_dest(struct netns_ipvs *ipvs, struct ip_vs_dest *dest,
1242 bool cleanup)
1243 {
1244 ip_vs_stop_estimator(ipvs, &dest->stats);
1245
1246 /*
1247 * Remove it from the d-linked list with the real services.
1248 */
1249 ip_vs_rs_unhash(dest);
1250
1251 spin_lock_bh(&ipvs->dest_trash_lock);
1252 IP_VS_DBG_BUF(3, "Moving dest %s:%u into trash, dest->refcnt=%d\n",
1253 IP_VS_DBG_ADDR(dest->af, &dest->addr), ntohs(dest->port),
1254 refcount_read(&dest->refcnt));
1255 if (list_empty(&ipvs->dest_trash) && !cleanup)
1256 mod_timer(&ipvs->dest_trash_timer,
1257 jiffies + (IP_VS_DEST_TRASH_PERIOD >> 1));
1258 /* dest lives in trash with reference */
1259 list_add(&dest->t_list, &ipvs->dest_trash);
1260 dest->idle_start = 0;
1261 spin_unlock_bh(&ipvs->dest_trash_lock);
1262
1263 /* Queue up delayed work to expire all no destination connections.
1264 * No-op when CONFIG_SYSCTL is disabled.
1265 */
1266 if (!cleanup)
1267 ip_vs_enqueue_expire_nodest_conns(ipvs);
1268 }
1269
1270
1271 /*
1272 * Unlink a destination from the given service
1273 */
__ip_vs_unlink_dest(struct ip_vs_service * svc,struct ip_vs_dest * dest,int svcupd)1274 static void __ip_vs_unlink_dest(struct ip_vs_service *svc,
1275 struct ip_vs_dest *dest,
1276 int svcupd)
1277 {
1278 dest->flags &= ~IP_VS_DEST_F_AVAILABLE;
1279
1280 /*
1281 * Remove it from the d-linked destination list.
1282 */
1283 list_del_rcu(&dest->n_list);
1284 svc->num_dests--;
1285
1286 if (dest->af != svc->af)
1287 svc->ipvs->mixed_address_family_dests--;
1288
1289 if (svcupd) {
1290 struct ip_vs_scheduler *sched;
1291
1292 sched = rcu_dereference_protected(svc->scheduler, 1);
1293 if (sched && sched->del_dest)
1294 sched->del_dest(svc, dest);
1295 }
1296 }
1297
1298
1299 /*
1300 * Delete a destination server in the given service
1301 */
1302 static int
ip_vs_del_dest(struct ip_vs_service * svc,struct ip_vs_dest_user_kern * udest)1303 ip_vs_del_dest(struct ip_vs_service *svc, struct ip_vs_dest_user_kern *udest)
1304 {
1305 struct ip_vs_dest *dest;
1306 __be16 dport = udest->port;
1307
1308 /* We use function that requires RCU lock */
1309 rcu_read_lock();
1310 dest = ip_vs_lookup_dest(svc, udest->af, &udest->addr, dport);
1311 rcu_read_unlock();
1312
1313 if (dest == NULL) {
1314 IP_VS_DBG(1, "%s(): destination not found!\n", __func__);
1315 return -ENOENT;
1316 }
1317
1318 /*
1319 * Unlink dest from the service
1320 */
1321 __ip_vs_unlink_dest(svc, dest, 1);
1322
1323 /*
1324 * Delete the destination
1325 */
1326 __ip_vs_del_dest(svc->ipvs, dest, false);
1327
1328 return 0;
1329 }
1330
ip_vs_dest_trash_expire(struct timer_list * t)1331 static void ip_vs_dest_trash_expire(struct timer_list *t)
1332 {
1333 struct netns_ipvs *ipvs = timer_container_of(ipvs, t,
1334 dest_trash_timer);
1335 struct ip_vs_dest *dest, *next;
1336 unsigned long now = jiffies;
1337
1338 spin_lock(&ipvs->dest_trash_lock);
1339 list_for_each_entry_safe(dest, next, &ipvs->dest_trash, t_list) {
1340 if (refcount_read(&dest->refcnt) > 1)
1341 continue;
1342 if (dest->idle_start) {
1343 if (time_before(now, dest->idle_start +
1344 IP_VS_DEST_TRASH_PERIOD))
1345 continue;
1346 } else {
1347 dest->idle_start = max(1UL, now);
1348 continue;
1349 }
1350 IP_VS_DBG_BUF(3, "Removing destination %u/%s:%u from trash\n",
1351 dest->vfwmark,
1352 IP_VS_DBG_ADDR(dest->af, &dest->addr),
1353 ntohs(dest->port));
1354 list_del(&dest->t_list);
1355 ip_vs_dest_free(dest);
1356 }
1357 if (!list_empty(&ipvs->dest_trash))
1358 mod_timer(&ipvs->dest_trash_timer,
1359 jiffies + (IP_VS_DEST_TRASH_PERIOD >> 1));
1360 spin_unlock(&ipvs->dest_trash_lock);
1361 }
1362
1363 /*
1364 * Add a service into the service hash table
1365 */
1366 static int
ip_vs_add_service(struct netns_ipvs * ipvs,struct ip_vs_service_user_kern * u,struct ip_vs_service ** svc_p)1367 ip_vs_add_service(struct netns_ipvs *ipvs, struct ip_vs_service_user_kern *u,
1368 struct ip_vs_service **svc_p)
1369 {
1370 int ret = 0;
1371 struct ip_vs_scheduler *sched = NULL;
1372 struct ip_vs_pe *pe = NULL;
1373 struct ip_vs_service *svc = NULL;
1374 int ret_hooks = -1;
1375
1376 /* increase the module use count */
1377 if (!ip_vs_use_count_inc())
1378 return -ENOPROTOOPT;
1379
1380 /* Lookup the scheduler by 'u->sched_name' */
1381 if (strcmp(u->sched_name, "none")) {
1382 sched = ip_vs_scheduler_get(u->sched_name);
1383 if (!sched) {
1384 pr_info("Scheduler module ip_vs_%s not found\n",
1385 u->sched_name);
1386 ret = -ENOENT;
1387 goto out_err;
1388 }
1389 }
1390
1391 if (u->pe_name && *u->pe_name) {
1392 pe = ip_vs_pe_getbyname(u->pe_name);
1393 if (pe == NULL) {
1394 pr_info("persistence engine module ip_vs_pe_%s "
1395 "not found\n", u->pe_name);
1396 ret = -ENOENT;
1397 goto out_err;
1398 }
1399 }
1400
1401 #ifdef CONFIG_IP_VS_IPV6
1402 if (u->af == AF_INET6) {
1403 __u32 plen = (__force __u32) u->netmask;
1404
1405 if (plen < 1 || plen > 128) {
1406 ret = -EINVAL;
1407 goto out_err;
1408 }
1409
1410 ret = nf_defrag_ipv6_enable(ipvs->net);
1411 if (ret)
1412 goto out_err;
1413 }
1414 #endif
1415
1416 if ((u->af == AF_INET && !ipvs->num_services) ||
1417 (u->af == AF_INET6 && !ipvs->num_services6)) {
1418 ret = ip_vs_register_hooks(ipvs, u->af);
1419 if (ret < 0)
1420 goto out_err;
1421 ret_hooks = ret;
1422 }
1423
1424 svc = kzalloc_obj(struct ip_vs_service);
1425 if (svc == NULL) {
1426 IP_VS_DBG(1, "%s(): no memory\n", __func__);
1427 ret = -ENOMEM;
1428 goto out_err;
1429 }
1430 ret = ip_vs_stats_init_alloc(&svc->stats);
1431 if (ret < 0)
1432 goto out_err;
1433
1434 /* I'm the first user of the service */
1435 atomic_set(&svc->refcnt, 0);
1436
1437 svc->af = u->af;
1438 svc->protocol = u->protocol;
1439 ip_vs_addr_copy(svc->af, &svc->addr, &u->addr);
1440 svc->port = u->port;
1441 svc->fwmark = u->fwmark;
1442 svc->flags = u->flags & ~IP_VS_SVC_F_HASHED;
1443 svc->timeout = u->timeout * HZ;
1444 svc->netmask = u->netmask;
1445 svc->ipvs = ipvs;
1446
1447 INIT_LIST_HEAD(&svc->destinations);
1448 spin_lock_init(&svc->sched_lock);
1449
1450 /* Bind the scheduler */
1451 if (sched) {
1452 ret = ip_vs_bind_scheduler(svc, sched);
1453 if (ret)
1454 goto out_err;
1455 }
1456
1457 ret = ip_vs_start_estimator(ipvs, &svc->stats);
1458 if (ret < 0)
1459 goto out_err;
1460
1461 /* Update the virtual service counters */
1462 if (svc->port == FTPPORT)
1463 atomic_inc(&ipvs->ftpsvc_counter);
1464 else if (svc->port == 0)
1465 atomic_inc(&ipvs->nullsvc_counter);
1466 if (pe && pe->conn_out)
1467 atomic_inc(&ipvs->conn_out_counter);
1468
1469 /* Bind the ct retriever */
1470 RCU_INIT_POINTER(svc->pe, pe);
1471 pe = NULL;
1472
1473 /* Count only IPv4 services for old get/setsockopt interface */
1474 if (svc->af == AF_INET)
1475 ipvs->num_services++;
1476 else if (svc->af == AF_INET6)
1477 ipvs->num_services6++;
1478
1479 /* Hash the service into the service table */
1480 ip_vs_svc_hash(svc);
1481
1482 *svc_p = svc;
1483
1484 if (!READ_ONCE(ipvs->enable)) {
1485 /* Now there is a service - full throttle */
1486 WRITE_ONCE(ipvs->enable, 1);
1487
1488 /* Start estimation for first time */
1489 ip_vs_est_reload_start(ipvs);
1490 }
1491
1492 return 0;
1493
1494
1495 out_err:
1496 if (ret_hooks >= 0)
1497 ip_vs_unregister_hooks(ipvs, u->af);
1498 if (svc != NULL) {
1499 ip_vs_unbind_scheduler(svc, sched);
1500 ip_vs_service_free(svc);
1501 }
1502 ip_vs_scheduler_put(sched);
1503 ip_vs_pe_put(pe);
1504
1505 /* decrease the module use count */
1506 ip_vs_use_count_dec();
1507
1508 return ret;
1509 }
1510
1511
1512 /*
1513 * Edit a service and bind it with a new scheduler
1514 */
1515 static int
ip_vs_edit_service(struct ip_vs_service * svc,struct ip_vs_service_user_kern * u)1516 ip_vs_edit_service(struct ip_vs_service *svc, struct ip_vs_service_user_kern *u)
1517 {
1518 struct ip_vs_scheduler *sched = NULL, *old_sched;
1519 struct ip_vs_pe *pe = NULL, *old_pe = NULL;
1520 int ret = 0;
1521 bool new_pe_conn_out, old_pe_conn_out;
1522
1523 /*
1524 * Lookup the scheduler, by 'u->sched_name'
1525 */
1526 if (strcmp(u->sched_name, "none")) {
1527 sched = ip_vs_scheduler_get(u->sched_name);
1528 if (!sched) {
1529 pr_info("Scheduler module ip_vs_%s not found\n",
1530 u->sched_name);
1531 return -ENOENT;
1532 }
1533 }
1534 old_sched = sched;
1535
1536 if (u->pe_name && *u->pe_name) {
1537 pe = ip_vs_pe_getbyname(u->pe_name);
1538 if (pe == NULL) {
1539 pr_info("persistence engine module ip_vs_pe_%s "
1540 "not found\n", u->pe_name);
1541 ret = -ENOENT;
1542 goto out;
1543 }
1544 old_pe = pe;
1545 }
1546
1547 #ifdef CONFIG_IP_VS_IPV6
1548 if (u->af == AF_INET6) {
1549 __u32 plen = (__force __u32) u->netmask;
1550
1551 if (plen < 1 || plen > 128) {
1552 ret = -EINVAL;
1553 goto out;
1554 }
1555 }
1556 #endif
1557
1558 old_sched = rcu_dereference_protected(svc->scheduler, 1);
1559 if (sched != old_sched) {
1560 if (old_sched) {
1561 ip_vs_unbind_scheduler(svc, old_sched);
1562 RCU_INIT_POINTER(svc->scheduler, NULL);
1563 /* Wait all svc->sched_data users */
1564 synchronize_rcu();
1565 }
1566 /* Bind the new scheduler */
1567 if (sched) {
1568 ret = ip_vs_bind_scheduler(svc, sched);
1569 if (ret) {
1570 ip_vs_scheduler_put(sched);
1571 goto out;
1572 }
1573 }
1574 }
1575
1576 /*
1577 * Set the flags and timeout value
1578 */
1579 svc->flags = u->flags | IP_VS_SVC_F_HASHED;
1580 svc->timeout = u->timeout * HZ;
1581 svc->netmask = u->netmask;
1582
1583 old_pe = rcu_dereference_protected(svc->pe, 1);
1584 if (pe != old_pe) {
1585 rcu_assign_pointer(svc->pe, pe);
1586 /* check for optional methods in new pe */
1587 new_pe_conn_out = (pe && pe->conn_out) ? true : false;
1588 old_pe_conn_out = (old_pe && old_pe->conn_out) ? true : false;
1589 if (new_pe_conn_out && !old_pe_conn_out)
1590 atomic_inc(&svc->ipvs->conn_out_counter);
1591 if (old_pe_conn_out && !new_pe_conn_out)
1592 atomic_dec(&svc->ipvs->conn_out_counter);
1593 }
1594
1595 out:
1596 ip_vs_scheduler_put(old_sched);
1597 ip_vs_pe_put(old_pe);
1598 return ret;
1599 }
1600
1601 /*
1602 * Delete a service from the service list
1603 * - The service must be unlinked, unlocked and not referenced!
1604 * - We are called under _bh lock
1605 */
__ip_vs_del_service(struct ip_vs_service * svc,bool cleanup)1606 static void __ip_vs_del_service(struct ip_vs_service *svc, bool cleanup)
1607 {
1608 struct ip_vs_dest *dest, *nxt;
1609 struct ip_vs_scheduler *old_sched;
1610 struct ip_vs_pe *old_pe;
1611 struct netns_ipvs *ipvs = svc->ipvs;
1612
1613 if (svc->af == AF_INET) {
1614 ipvs->num_services--;
1615 if (!ipvs->num_services)
1616 ip_vs_unregister_hooks(ipvs, svc->af);
1617 } else if (svc->af == AF_INET6) {
1618 ipvs->num_services6--;
1619 if (!ipvs->num_services6)
1620 ip_vs_unregister_hooks(ipvs, svc->af);
1621 }
1622
1623 ip_vs_stop_estimator(svc->ipvs, &svc->stats);
1624
1625 /* Unbind scheduler */
1626 old_sched = rcu_dereference_protected(svc->scheduler, 1);
1627 ip_vs_unbind_scheduler(svc, old_sched);
1628 ip_vs_scheduler_put(old_sched);
1629
1630 /* Unbind persistence engine, keep svc->pe */
1631 old_pe = rcu_dereference_protected(svc->pe, 1);
1632 if (old_pe && old_pe->conn_out)
1633 atomic_dec(&ipvs->conn_out_counter);
1634 ip_vs_pe_put(old_pe);
1635
1636 /*
1637 * Unlink the whole destination list
1638 */
1639 list_for_each_entry_safe(dest, nxt, &svc->destinations, n_list) {
1640 __ip_vs_unlink_dest(svc, dest, 0);
1641 __ip_vs_del_dest(svc->ipvs, dest, cleanup);
1642 }
1643
1644 /*
1645 * Update the virtual service counters
1646 */
1647 if (svc->port == FTPPORT)
1648 atomic_dec(&ipvs->ftpsvc_counter);
1649 else if (svc->port == 0)
1650 atomic_dec(&ipvs->nullsvc_counter);
1651
1652 /*
1653 * Free the service if nobody refers to it
1654 */
1655 __ip_vs_svc_put(svc);
1656
1657 /* decrease the module use count */
1658 ip_vs_use_count_dec();
1659 }
1660
1661 /*
1662 * Unlink a service from list and try to delete it if its refcnt reached 0
1663 */
ip_vs_unlink_service(struct ip_vs_service * svc,bool cleanup)1664 static void ip_vs_unlink_service(struct ip_vs_service *svc, bool cleanup)
1665 {
1666 ip_vs_unregister_conntrack(svc);
1667 /* Hold svc to avoid double release from dest_trash */
1668 atomic_inc(&svc->refcnt);
1669 /*
1670 * Unhash it from the service table
1671 */
1672 ip_vs_svc_unhash(svc);
1673
1674 __ip_vs_del_service(svc, cleanup);
1675 }
1676
1677 /*
1678 * Delete a service from the service list
1679 */
ip_vs_del_service(struct ip_vs_service * svc)1680 static int ip_vs_del_service(struct ip_vs_service *svc)
1681 {
1682 if (svc == NULL)
1683 return -EEXIST;
1684 ip_vs_unlink_service(svc, false);
1685
1686 return 0;
1687 }
1688
1689
1690 /*
1691 * Flush all the virtual services
1692 */
ip_vs_flush(struct netns_ipvs * ipvs,bool cleanup)1693 static int ip_vs_flush(struct netns_ipvs *ipvs, bool cleanup)
1694 {
1695 int idx;
1696 struct ip_vs_service *svc;
1697 struct hlist_node *n;
1698
1699 /*
1700 * Flush the service table hashed by <netns,protocol,addr,port>
1701 */
1702 for(idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
1703 hlist_for_each_entry_safe(svc, n, &ip_vs_svc_table[idx],
1704 s_list) {
1705 if (svc->ipvs == ipvs)
1706 ip_vs_unlink_service(svc, cleanup);
1707 }
1708 }
1709
1710 /*
1711 * Flush the service table hashed by fwmark
1712 */
1713 for(idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
1714 hlist_for_each_entry_safe(svc, n, &ip_vs_svc_fwm_table[idx],
1715 f_list) {
1716 if (svc->ipvs == ipvs)
1717 ip_vs_unlink_service(svc, cleanup);
1718 }
1719 }
1720
1721 return 0;
1722 }
1723
1724 /*
1725 * Delete service by {netns} in the service table.
1726 * Called by __ip_vs_batch_cleanup()
1727 */
ip_vs_service_nets_cleanup(struct list_head * net_list)1728 void ip_vs_service_nets_cleanup(struct list_head *net_list)
1729 {
1730 struct netns_ipvs *ipvs;
1731 struct net *net;
1732
1733 /* Check for "full" addressed entries */
1734 mutex_lock(&__ip_vs_mutex);
1735 list_for_each_entry(net, net_list, exit_list) {
1736 ipvs = net_ipvs(net);
1737 ip_vs_flush(ipvs, true);
1738 }
1739 mutex_unlock(&__ip_vs_mutex);
1740 }
1741
1742 /* Put all references for device (dst_cache) */
1743 static inline void
ip_vs_forget_dev(struct ip_vs_dest * dest,struct net_device * dev)1744 ip_vs_forget_dev(struct ip_vs_dest *dest, struct net_device *dev)
1745 {
1746 struct ip_vs_dest_dst *dest_dst;
1747
1748 spin_lock_bh(&dest->dst_lock);
1749 dest_dst = rcu_dereference_protected(dest->dest_dst, 1);
1750 if (dest_dst && dest_dst->dst_cache->dev == dev) {
1751 IP_VS_DBG_BUF(3, "Reset dev:%s dest %s:%u ,dest->refcnt=%d\n",
1752 dev->name,
1753 IP_VS_DBG_ADDR(dest->af, &dest->addr),
1754 ntohs(dest->port),
1755 refcount_read(&dest->refcnt));
1756 __ip_vs_dst_cache_reset(dest);
1757 }
1758 spin_unlock_bh(&dest->dst_lock);
1759
1760 }
1761 /* Netdev event receiver
1762 * Currently only NETDEV_DOWN is handled to release refs to cached dsts
1763 */
ip_vs_dst_event(struct notifier_block * this,unsigned long event,void * ptr)1764 static int ip_vs_dst_event(struct notifier_block *this, unsigned long event,
1765 void *ptr)
1766 {
1767 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1768 struct net *net = dev_net(dev);
1769 struct netns_ipvs *ipvs = net_ipvs(net);
1770 struct ip_vs_service *svc;
1771 struct ip_vs_dest *dest;
1772 unsigned int idx;
1773
1774 if (event != NETDEV_DOWN || !ipvs)
1775 return NOTIFY_DONE;
1776 IP_VS_DBG(3, "%s() dev=%s\n", __func__, dev->name);
1777 mutex_lock(&__ip_vs_mutex);
1778 for (idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
1779 hlist_for_each_entry(svc, &ip_vs_svc_table[idx], s_list) {
1780 if (svc->ipvs == ipvs) {
1781 list_for_each_entry(dest, &svc->destinations,
1782 n_list) {
1783 ip_vs_forget_dev(dest, dev);
1784 }
1785 }
1786 }
1787
1788 hlist_for_each_entry(svc, &ip_vs_svc_fwm_table[idx], f_list) {
1789 if (svc->ipvs == ipvs) {
1790 list_for_each_entry(dest, &svc->destinations,
1791 n_list) {
1792 ip_vs_forget_dev(dest, dev);
1793 }
1794 }
1795
1796 }
1797 }
1798
1799 spin_lock_bh(&ipvs->dest_trash_lock);
1800 list_for_each_entry(dest, &ipvs->dest_trash, t_list) {
1801 ip_vs_forget_dev(dest, dev);
1802 }
1803 spin_unlock_bh(&ipvs->dest_trash_lock);
1804 mutex_unlock(&__ip_vs_mutex);
1805 return NOTIFY_DONE;
1806 }
1807
1808 /*
1809 * Zero counters in a service or all services
1810 */
ip_vs_zero_service(struct ip_vs_service * svc)1811 static int ip_vs_zero_service(struct ip_vs_service *svc)
1812 {
1813 struct ip_vs_dest *dest;
1814
1815 list_for_each_entry(dest, &svc->destinations, n_list) {
1816 ip_vs_zero_stats(&dest->stats);
1817 }
1818 ip_vs_zero_stats(&svc->stats);
1819 return 0;
1820 }
1821
ip_vs_zero_all(struct netns_ipvs * ipvs)1822 static int ip_vs_zero_all(struct netns_ipvs *ipvs)
1823 {
1824 int idx;
1825 struct ip_vs_service *svc;
1826
1827 for(idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
1828 hlist_for_each_entry(svc, &ip_vs_svc_table[idx], s_list) {
1829 if (svc->ipvs == ipvs)
1830 ip_vs_zero_service(svc);
1831 }
1832 }
1833
1834 for(idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
1835 hlist_for_each_entry(svc, &ip_vs_svc_fwm_table[idx], f_list) {
1836 if (svc->ipvs == ipvs)
1837 ip_vs_zero_service(svc);
1838 }
1839 }
1840
1841 ip_vs_zero_stats(&ipvs->tot_stats->s);
1842 return 0;
1843 }
1844
1845 #ifdef CONFIG_SYSCTL
1846
1847 static int
proc_do_defense_mode(const struct ctl_table * table,int write,void * buffer,size_t * lenp,loff_t * ppos)1848 proc_do_defense_mode(const struct ctl_table *table, int write,
1849 void *buffer, size_t *lenp, loff_t *ppos)
1850 {
1851 struct netns_ipvs *ipvs = table->extra2;
1852 int *valp = table->data;
1853 int val = *valp;
1854 int rc;
1855
1856 struct ctl_table tmp = {
1857 .data = &val,
1858 .maxlen = sizeof(int),
1859 .mode = table->mode,
1860 };
1861
1862 rc = proc_dointvec(&tmp, write, buffer, lenp, ppos);
1863 if (write && (*valp != val)) {
1864 if (val < 0 || val > 3) {
1865 rc = -EINVAL;
1866 } else {
1867 *valp = val;
1868 update_defense_level(ipvs);
1869 }
1870 }
1871 return rc;
1872 }
1873
1874 static int
proc_do_sync_threshold(const struct ctl_table * table,int write,void * buffer,size_t * lenp,loff_t * ppos)1875 proc_do_sync_threshold(const struct ctl_table *table, int write,
1876 void *buffer, size_t *lenp, loff_t *ppos)
1877 {
1878 struct netns_ipvs *ipvs = table->extra2;
1879 int *valp = table->data;
1880 int val[2];
1881 int rc;
1882 struct ctl_table tmp = {
1883 .data = &val,
1884 .maxlen = table->maxlen,
1885 .mode = table->mode,
1886 };
1887
1888 mutex_lock(&ipvs->sync_mutex);
1889 memcpy(val, valp, sizeof(val));
1890 rc = proc_dointvec(&tmp, write, buffer, lenp, ppos);
1891 if (write) {
1892 if (val[0] < 0 || val[1] < 0 ||
1893 (val[0] >= val[1] && val[1]))
1894 rc = -EINVAL;
1895 else
1896 memcpy(valp, val, sizeof(val));
1897 }
1898 mutex_unlock(&ipvs->sync_mutex);
1899 return rc;
1900 }
1901
1902 static int
proc_do_sync_ports(const struct ctl_table * table,int write,void * buffer,size_t * lenp,loff_t * ppos)1903 proc_do_sync_ports(const struct ctl_table *table, int write,
1904 void *buffer, size_t *lenp, loff_t *ppos)
1905 {
1906 int *valp = table->data;
1907 int val = *valp;
1908 int rc;
1909
1910 struct ctl_table tmp = {
1911 .data = &val,
1912 .maxlen = sizeof(int),
1913 .mode = table->mode,
1914 };
1915
1916 rc = proc_dointvec(&tmp, write, buffer, lenp, ppos);
1917 if (write && (*valp != val)) {
1918 if (val < 1 || !is_power_of_2(val))
1919 rc = -EINVAL;
1920 else
1921 *valp = val;
1922 }
1923 return rc;
1924 }
1925
ipvs_proc_est_cpumask_set(const struct ctl_table * table,void * buffer)1926 static int ipvs_proc_est_cpumask_set(const struct ctl_table *table,
1927 void *buffer)
1928 {
1929 struct netns_ipvs *ipvs = table->extra2;
1930 cpumask_var_t *valp = table->data;
1931 cpumask_var_t newmask;
1932 int ret;
1933
1934 if (!zalloc_cpumask_var(&newmask, GFP_KERNEL))
1935 return -ENOMEM;
1936
1937 ret = cpulist_parse(buffer, newmask);
1938 if (ret)
1939 goto out;
1940
1941 mutex_lock(&ipvs->est_mutex);
1942
1943 if (!ipvs->est_cpulist_valid) {
1944 if (!zalloc_cpumask_var(valp, GFP_KERNEL)) {
1945 ret = -ENOMEM;
1946 goto unlock;
1947 }
1948 ipvs->est_cpulist_valid = 1;
1949 }
1950 cpumask_and(newmask, newmask, ¤t->cpus_mask);
1951 cpumask_copy(*valp, newmask);
1952 /* est_max_threads may depend on cpulist size */
1953 ipvs->est_max_threads = ip_vs_est_max_threads(ipvs);
1954 ipvs->est_calc_phase = 1;
1955 ip_vs_est_reload_start(ipvs);
1956
1957 unlock:
1958 mutex_unlock(&ipvs->est_mutex);
1959
1960 out:
1961 free_cpumask_var(newmask);
1962 return ret;
1963 }
1964
ipvs_proc_est_cpumask_get(const struct ctl_table * table,void * buffer,size_t size)1965 static int ipvs_proc_est_cpumask_get(const struct ctl_table *table,
1966 void *buffer, size_t size)
1967 {
1968 struct netns_ipvs *ipvs = table->extra2;
1969 cpumask_var_t *valp = table->data;
1970 struct cpumask *mask;
1971 int ret;
1972
1973 mutex_lock(&ipvs->est_mutex);
1974
1975 if (ipvs->est_cpulist_valid)
1976 mask = *valp;
1977 else
1978 mask = (struct cpumask *)housekeeping_cpumask(HK_TYPE_KTHREAD);
1979 ret = scnprintf(buffer, size, "%*pbl\n", cpumask_pr_args(mask));
1980
1981 mutex_unlock(&ipvs->est_mutex);
1982
1983 return ret;
1984 }
1985
ipvs_proc_est_cpulist(const struct ctl_table * table,int write,void * buffer,size_t * lenp,loff_t * ppos)1986 static int ipvs_proc_est_cpulist(const struct ctl_table *table, int write,
1987 void *buffer, size_t *lenp, loff_t *ppos)
1988 {
1989 int ret;
1990
1991 /* Ignore both read and write(append) if *ppos not 0 */
1992 if (*ppos || !*lenp) {
1993 *lenp = 0;
1994 return 0;
1995 }
1996 if (write) {
1997 /* proc_sys_call_handler() appends terminator */
1998 ret = ipvs_proc_est_cpumask_set(table, buffer);
1999 if (ret >= 0)
2000 *ppos += *lenp;
2001 } else {
2002 /* proc_sys_call_handler() allocates 1 byte for terminator */
2003 ret = ipvs_proc_est_cpumask_get(table, buffer, *lenp + 1);
2004 if (ret >= 0) {
2005 *lenp = ret;
2006 *ppos += *lenp;
2007 ret = 0;
2008 }
2009 }
2010 return ret;
2011 }
2012
ipvs_proc_est_nice(const struct ctl_table * table,int write,void * buffer,size_t * lenp,loff_t * ppos)2013 static int ipvs_proc_est_nice(const struct ctl_table *table, int write,
2014 void *buffer, size_t *lenp, loff_t *ppos)
2015 {
2016 struct netns_ipvs *ipvs = table->extra2;
2017 int *valp = table->data;
2018 int val = *valp;
2019 int ret;
2020
2021 struct ctl_table tmp_table = {
2022 .data = &val,
2023 .maxlen = sizeof(int),
2024 .mode = table->mode,
2025 };
2026
2027 ret = proc_dointvec(&tmp_table, write, buffer, lenp, ppos);
2028 if (write && ret >= 0) {
2029 if (val < MIN_NICE || val > MAX_NICE) {
2030 ret = -EINVAL;
2031 } else {
2032 mutex_lock(&ipvs->est_mutex);
2033 if (*valp != val) {
2034 *valp = val;
2035 ip_vs_est_reload_start(ipvs);
2036 }
2037 mutex_unlock(&ipvs->est_mutex);
2038 }
2039 }
2040 return ret;
2041 }
2042
ipvs_proc_run_estimation(const struct ctl_table * table,int write,void * buffer,size_t * lenp,loff_t * ppos)2043 static int ipvs_proc_run_estimation(const struct ctl_table *table, int write,
2044 void *buffer, size_t *lenp, loff_t *ppos)
2045 {
2046 struct netns_ipvs *ipvs = table->extra2;
2047 int *valp = table->data;
2048 int val = *valp;
2049 int ret;
2050
2051 struct ctl_table tmp_table = {
2052 .data = &val,
2053 .maxlen = sizeof(int),
2054 .mode = table->mode,
2055 };
2056
2057 ret = proc_dointvec(&tmp_table, write, buffer, lenp, ppos);
2058 if (write && ret >= 0) {
2059 mutex_lock(&ipvs->est_mutex);
2060 if (*valp != val) {
2061 *valp = val;
2062 ip_vs_est_reload_start(ipvs);
2063 }
2064 mutex_unlock(&ipvs->est_mutex);
2065 }
2066 return ret;
2067 }
2068
2069 /*
2070 * IPVS sysctl table (under the /proc/sys/net/ipv4/vs/)
2071 * Do not change order or insert new entries without
2072 * align with netns init in ip_vs_control_net_init()
2073 */
2074
2075 static struct ctl_table vs_vars[] = {
2076 {
2077 .procname = "amemthresh",
2078 .maxlen = sizeof(int),
2079 .mode = 0644,
2080 .proc_handler = proc_dointvec,
2081 },
2082 {
2083 .procname = "am_droprate",
2084 .maxlen = sizeof(int),
2085 .mode = 0644,
2086 .proc_handler = proc_dointvec,
2087 },
2088 {
2089 .procname = "drop_entry",
2090 .maxlen = sizeof(int),
2091 .mode = 0644,
2092 .proc_handler = proc_do_defense_mode,
2093 },
2094 {
2095 .procname = "drop_packet",
2096 .maxlen = sizeof(int),
2097 .mode = 0644,
2098 .proc_handler = proc_do_defense_mode,
2099 },
2100 #ifdef CONFIG_IP_VS_NFCT
2101 {
2102 .procname = "conntrack",
2103 .maxlen = sizeof(int),
2104 .mode = 0644,
2105 .proc_handler = &proc_dointvec,
2106 },
2107 #endif
2108 {
2109 .procname = "secure_tcp",
2110 .maxlen = sizeof(int),
2111 .mode = 0644,
2112 .proc_handler = proc_do_defense_mode,
2113 },
2114 {
2115 .procname = "snat_reroute",
2116 .maxlen = sizeof(int),
2117 .mode = 0644,
2118 .proc_handler = &proc_dointvec,
2119 },
2120 {
2121 .procname = "sync_version",
2122 .maxlen = sizeof(int),
2123 .mode = 0644,
2124 .proc_handler = proc_dointvec_minmax,
2125 .extra1 = SYSCTL_ZERO,
2126 .extra2 = SYSCTL_ONE,
2127 },
2128 {
2129 .procname = "sync_ports",
2130 .maxlen = sizeof(int),
2131 .mode = 0644,
2132 .proc_handler = proc_do_sync_ports,
2133 },
2134 {
2135 .procname = "sync_persist_mode",
2136 .maxlen = sizeof(int),
2137 .mode = 0644,
2138 .proc_handler = proc_dointvec,
2139 },
2140 {
2141 .procname = "sync_qlen_max",
2142 .maxlen = sizeof(unsigned long),
2143 .mode = 0644,
2144 .proc_handler = proc_doulongvec_minmax,
2145 },
2146 {
2147 .procname = "sync_sock_size",
2148 .maxlen = sizeof(int),
2149 .mode = 0644,
2150 .proc_handler = proc_dointvec,
2151 },
2152 {
2153 .procname = "cache_bypass",
2154 .maxlen = sizeof(int),
2155 .mode = 0644,
2156 .proc_handler = proc_dointvec,
2157 },
2158 {
2159 .procname = "expire_nodest_conn",
2160 .maxlen = sizeof(int),
2161 .mode = 0644,
2162 .proc_handler = proc_dointvec,
2163 },
2164 {
2165 .procname = "sloppy_tcp",
2166 .maxlen = sizeof(int),
2167 .mode = 0644,
2168 .proc_handler = proc_dointvec,
2169 },
2170 {
2171 .procname = "sloppy_sctp",
2172 .maxlen = sizeof(int),
2173 .mode = 0644,
2174 .proc_handler = proc_dointvec,
2175 },
2176 {
2177 .procname = "expire_quiescent_template",
2178 .maxlen = sizeof(int),
2179 .mode = 0644,
2180 .proc_handler = proc_dointvec,
2181 },
2182 {
2183 .procname = "sync_threshold",
2184 .maxlen =
2185 sizeof(((struct netns_ipvs *)0)->sysctl_sync_threshold),
2186 .mode = 0644,
2187 .proc_handler = proc_do_sync_threshold,
2188 },
2189 {
2190 .procname = "sync_refresh_period",
2191 .maxlen = sizeof(int),
2192 .mode = 0644,
2193 .proc_handler = proc_dointvec_jiffies,
2194 },
2195 {
2196 .procname = "sync_retries",
2197 .maxlen = sizeof(int),
2198 .mode = 0644,
2199 .proc_handler = proc_dointvec_minmax,
2200 .extra1 = SYSCTL_ZERO,
2201 .extra2 = SYSCTL_THREE,
2202 },
2203 {
2204 .procname = "nat_icmp_send",
2205 .maxlen = sizeof(int),
2206 .mode = 0644,
2207 .proc_handler = proc_dointvec,
2208 },
2209 {
2210 .procname = "pmtu_disc",
2211 .maxlen = sizeof(int),
2212 .mode = 0644,
2213 .proc_handler = proc_dointvec,
2214 },
2215 {
2216 .procname = "backup_only",
2217 .maxlen = sizeof(int),
2218 .mode = 0644,
2219 .proc_handler = proc_dointvec,
2220 },
2221 {
2222 .procname = "conn_reuse_mode",
2223 .maxlen = sizeof(int),
2224 .mode = 0644,
2225 .proc_handler = proc_dointvec,
2226 },
2227 {
2228 .procname = "schedule_icmp",
2229 .maxlen = sizeof(int),
2230 .mode = 0644,
2231 .proc_handler = proc_dointvec,
2232 },
2233 {
2234 .procname = "ignore_tunneled",
2235 .maxlen = sizeof(int),
2236 .mode = 0644,
2237 .proc_handler = proc_dointvec,
2238 },
2239 {
2240 .procname = "run_estimation",
2241 .maxlen = sizeof(int),
2242 .mode = 0644,
2243 .proc_handler = ipvs_proc_run_estimation,
2244 },
2245 {
2246 .procname = "est_cpulist",
2247 .maxlen = NR_CPUS, /* unused */
2248 .mode = 0644,
2249 .proc_handler = ipvs_proc_est_cpulist,
2250 },
2251 {
2252 .procname = "est_nice",
2253 .maxlen = sizeof(int),
2254 .mode = 0644,
2255 .proc_handler = ipvs_proc_est_nice,
2256 },
2257 #ifdef CONFIG_IP_VS_DEBUG
2258 {
2259 .procname = "debug_level",
2260 .data = &sysctl_ip_vs_debug_level,
2261 .maxlen = sizeof(int),
2262 .mode = 0644,
2263 .proc_handler = proc_dointvec,
2264 },
2265 #endif
2266 };
2267
2268 #endif
2269
2270 #ifdef CONFIG_PROC_FS
2271
2272 struct ip_vs_iter {
2273 struct seq_net_private p; /* Do not move this, netns depends upon it*/
2274 struct hlist_head *table;
2275 int bucket;
2276 };
2277
2278 /*
2279 * Write the contents of the VS rule table to a PROCfs file.
2280 * (It is kept just for backward compatibility)
2281 */
ip_vs_fwd_name(unsigned int flags)2282 static inline const char *ip_vs_fwd_name(unsigned int flags)
2283 {
2284 switch (flags & IP_VS_CONN_F_FWD_MASK) {
2285 case IP_VS_CONN_F_LOCALNODE:
2286 return "Local";
2287 case IP_VS_CONN_F_TUNNEL:
2288 return "Tunnel";
2289 case IP_VS_CONN_F_DROUTE:
2290 return "Route";
2291 default:
2292 return "Masq";
2293 }
2294 }
2295
2296
2297 /* Get the Nth entry in the two lists */
ip_vs_info_array(struct seq_file * seq,loff_t pos)2298 static struct ip_vs_service *ip_vs_info_array(struct seq_file *seq, loff_t pos)
2299 {
2300 struct net *net = seq_file_net(seq);
2301 struct netns_ipvs *ipvs = net_ipvs(net);
2302 struct ip_vs_iter *iter = seq->private;
2303 int idx;
2304 struct ip_vs_service *svc;
2305
2306 /* look in hash by protocol */
2307 for (idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
2308 hlist_for_each_entry_rcu(svc, &ip_vs_svc_table[idx], s_list) {
2309 if ((svc->ipvs == ipvs) && pos-- == 0) {
2310 iter->table = ip_vs_svc_table;
2311 iter->bucket = idx;
2312 return svc;
2313 }
2314 }
2315 }
2316
2317 /* keep looking in fwmark */
2318 for (idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
2319 hlist_for_each_entry_rcu(svc, &ip_vs_svc_fwm_table[idx],
2320 f_list) {
2321 if ((svc->ipvs == ipvs) && pos-- == 0) {
2322 iter->table = ip_vs_svc_fwm_table;
2323 iter->bucket = idx;
2324 return svc;
2325 }
2326 }
2327 }
2328
2329 return NULL;
2330 }
2331
ip_vs_info_seq_start(struct seq_file * seq,loff_t * pos)2332 static void *ip_vs_info_seq_start(struct seq_file *seq, loff_t *pos)
2333 __acquires(RCU)
2334 {
2335 rcu_read_lock();
2336 return *pos ? ip_vs_info_array(seq, *pos - 1) : SEQ_START_TOKEN;
2337 }
2338
2339
ip_vs_info_seq_next(struct seq_file * seq,void * v,loff_t * pos)2340 static void *ip_vs_info_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2341 {
2342 struct hlist_node *e;
2343 struct ip_vs_iter *iter;
2344 struct ip_vs_service *svc;
2345
2346 ++*pos;
2347 if (v == SEQ_START_TOKEN)
2348 return ip_vs_info_array(seq,0);
2349
2350 svc = v;
2351 iter = seq->private;
2352
2353 if (iter->table == ip_vs_svc_table) {
2354 /* next service in table hashed by protocol */
2355 e = rcu_dereference(hlist_next_rcu(&svc->s_list));
2356 if (e)
2357 return hlist_entry(e, struct ip_vs_service, s_list);
2358
2359 while (++iter->bucket < IP_VS_SVC_TAB_SIZE) {
2360 hlist_for_each_entry_rcu(svc,
2361 &ip_vs_svc_table[iter->bucket],
2362 s_list) {
2363 return svc;
2364 }
2365 }
2366
2367 iter->table = ip_vs_svc_fwm_table;
2368 iter->bucket = -1;
2369 goto scan_fwmark;
2370 }
2371
2372 /* next service in hashed by fwmark */
2373 e = rcu_dereference(hlist_next_rcu(&svc->f_list));
2374 if (e)
2375 return hlist_entry(e, struct ip_vs_service, f_list);
2376
2377 scan_fwmark:
2378 while (++iter->bucket < IP_VS_SVC_TAB_SIZE) {
2379 hlist_for_each_entry_rcu(svc,
2380 &ip_vs_svc_fwm_table[iter->bucket],
2381 f_list)
2382 return svc;
2383 }
2384
2385 return NULL;
2386 }
2387
ip_vs_info_seq_stop(struct seq_file * seq,void * v)2388 static void ip_vs_info_seq_stop(struct seq_file *seq, void *v)
2389 __releases(RCU)
2390 {
2391 rcu_read_unlock();
2392 }
2393
2394
ip_vs_info_seq_show(struct seq_file * seq,void * v)2395 static int ip_vs_info_seq_show(struct seq_file *seq, void *v)
2396 {
2397 if (v == SEQ_START_TOKEN) {
2398 seq_printf(seq,
2399 "IP Virtual Server version %d.%d.%d (size=%d)\n",
2400 NVERSION(IP_VS_VERSION_CODE), ip_vs_conn_tab_size);
2401 seq_puts(seq,
2402 "Prot LocalAddress:Port Scheduler Flags\n");
2403 seq_puts(seq,
2404 " -> RemoteAddress:Port Forward Weight ActiveConn InActConn\n");
2405 } else {
2406 struct net *net = seq_file_net(seq);
2407 struct netns_ipvs *ipvs = net_ipvs(net);
2408 const struct ip_vs_service *svc = v;
2409 const struct ip_vs_iter *iter = seq->private;
2410 const struct ip_vs_dest *dest;
2411 struct ip_vs_scheduler *sched = rcu_dereference(svc->scheduler);
2412 char *sched_name = sched ? sched->name : "none";
2413
2414 if (svc->ipvs != ipvs)
2415 return 0;
2416 if (iter->table == ip_vs_svc_table) {
2417 #ifdef CONFIG_IP_VS_IPV6
2418 if (svc->af == AF_INET6)
2419 seq_printf(seq, "%s [%pI6]:%04X %s ",
2420 ip_vs_proto_name(svc->protocol),
2421 &svc->addr.in6,
2422 ntohs(svc->port),
2423 sched_name);
2424 else
2425 #endif
2426 seq_printf(seq, "%s %08X:%04X %s %s ",
2427 ip_vs_proto_name(svc->protocol),
2428 ntohl(svc->addr.ip),
2429 ntohs(svc->port),
2430 sched_name,
2431 (svc->flags & IP_VS_SVC_F_ONEPACKET)?"ops ":"");
2432 } else {
2433 seq_printf(seq, "FWM %08X %s %s",
2434 svc->fwmark, sched_name,
2435 (svc->flags & IP_VS_SVC_F_ONEPACKET)?"ops ":"");
2436 }
2437
2438 if (svc->flags & IP_VS_SVC_F_PERSISTENT)
2439 seq_printf(seq, "persistent %d %08X\n",
2440 svc->timeout,
2441 ntohl(svc->netmask));
2442 else
2443 seq_putc(seq, '\n');
2444
2445 list_for_each_entry_rcu(dest, &svc->destinations, n_list) {
2446 #ifdef CONFIG_IP_VS_IPV6
2447 if (dest->af == AF_INET6)
2448 seq_printf(seq,
2449 " -> [%pI6]:%04X"
2450 " %-7s %-6d %-10d %-10d\n",
2451 &dest->addr.in6,
2452 ntohs(dest->port),
2453 ip_vs_fwd_name(atomic_read(&dest->conn_flags)),
2454 atomic_read(&dest->weight),
2455 atomic_read(&dest->activeconns),
2456 atomic_read(&dest->inactconns));
2457 else
2458 #endif
2459 seq_printf(seq,
2460 " -> %08X:%04X "
2461 "%-7s %-6d %-10d %-10d\n",
2462 ntohl(dest->addr.ip),
2463 ntohs(dest->port),
2464 ip_vs_fwd_name(atomic_read(&dest->conn_flags)),
2465 atomic_read(&dest->weight),
2466 atomic_read(&dest->activeconns),
2467 atomic_read(&dest->inactconns));
2468
2469 }
2470 }
2471 return 0;
2472 }
2473
2474 static const struct seq_operations ip_vs_info_seq_ops = {
2475 .start = ip_vs_info_seq_start,
2476 .next = ip_vs_info_seq_next,
2477 .stop = ip_vs_info_seq_stop,
2478 .show = ip_vs_info_seq_show,
2479 };
2480
ip_vs_stats_show(struct seq_file * seq,void * v)2481 static int ip_vs_stats_show(struct seq_file *seq, void *v)
2482 {
2483 struct net *net = seq_file_single_net(seq);
2484 struct ip_vs_kstats show;
2485
2486 /* 01234567 01234567 01234567 0123456701234567 0123456701234567 */
2487 seq_puts(seq,
2488 " Total Incoming Outgoing Incoming Outgoing\n");
2489 seq_puts(seq,
2490 " Conns Packets Packets Bytes Bytes\n");
2491
2492 ip_vs_copy_stats(&show, &net_ipvs(net)->tot_stats->s);
2493 seq_printf(seq, "%8LX %8LX %8LX %16LX %16LX\n\n",
2494 (unsigned long long)show.conns,
2495 (unsigned long long)show.inpkts,
2496 (unsigned long long)show.outpkts,
2497 (unsigned long long)show.inbytes,
2498 (unsigned long long)show.outbytes);
2499
2500 /* 01234567 01234567 01234567 0123456701234567 0123456701234567*/
2501 seq_puts(seq,
2502 " Conns/s Pkts/s Pkts/s Bytes/s Bytes/s\n");
2503 seq_printf(seq, "%8LX %8LX %8LX %16LX %16LX\n",
2504 (unsigned long long)show.cps,
2505 (unsigned long long)show.inpps,
2506 (unsigned long long)show.outpps,
2507 (unsigned long long)show.inbps,
2508 (unsigned long long)show.outbps);
2509
2510 return 0;
2511 }
2512
ip_vs_stats_percpu_show(struct seq_file * seq,void * v)2513 static int ip_vs_stats_percpu_show(struct seq_file *seq, void *v)
2514 {
2515 struct net *net = seq_file_single_net(seq);
2516 struct ip_vs_stats *tot_stats = &net_ipvs(net)->tot_stats->s;
2517 struct ip_vs_cpu_stats __percpu *cpustats = tot_stats->cpustats;
2518 struct ip_vs_kstats kstats;
2519 int i;
2520
2521 /* 01234567 01234567 01234567 0123456701234567 0123456701234567 */
2522 seq_puts(seq,
2523 " Total Incoming Outgoing Incoming Outgoing\n");
2524 seq_puts(seq,
2525 "CPU Conns Packets Packets Bytes Bytes\n");
2526
2527 for_each_possible_cpu(i) {
2528 struct ip_vs_cpu_stats *u = per_cpu_ptr(cpustats, i);
2529 unsigned int start;
2530 u64 conns, inpkts, outpkts, inbytes, outbytes;
2531
2532 do {
2533 start = u64_stats_fetch_begin(&u->syncp);
2534 conns = u64_stats_read(&u->cnt.conns);
2535 inpkts = u64_stats_read(&u->cnt.inpkts);
2536 outpkts = u64_stats_read(&u->cnt.outpkts);
2537 inbytes = u64_stats_read(&u->cnt.inbytes);
2538 outbytes = u64_stats_read(&u->cnt.outbytes);
2539 } while (u64_stats_fetch_retry(&u->syncp, start));
2540
2541 seq_printf(seq, "%3X %8LX %8LX %8LX %16LX %16LX\n",
2542 i, (u64)conns, (u64)inpkts,
2543 (u64)outpkts, (u64)inbytes,
2544 (u64)outbytes);
2545 }
2546
2547 ip_vs_copy_stats(&kstats, tot_stats);
2548
2549 seq_printf(seq, " ~ %8LX %8LX %8LX %16LX %16LX\n\n",
2550 (unsigned long long)kstats.conns,
2551 (unsigned long long)kstats.inpkts,
2552 (unsigned long long)kstats.outpkts,
2553 (unsigned long long)kstats.inbytes,
2554 (unsigned long long)kstats.outbytes);
2555
2556 /* ... 01234567 01234567 01234567 0123456701234567 0123456701234567 */
2557 seq_puts(seq,
2558 " Conns/s Pkts/s Pkts/s Bytes/s Bytes/s\n");
2559 seq_printf(seq, " %8LX %8LX %8LX %16LX %16LX\n",
2560 kstats.cps,
2561 kstats.inpps,
2562 kstats.outpps,
2563 kstats.inbps,
2564 kstats.outbps);
2565
2566 return 0;
2567 }
2568 #endif
2569
2570 /*
2571 * Set timeout values for tcp tcpfin udp in the timeout_table.
2572 */
ip_vs_set_timeout(struct netns_ipvs * ipvs,struct ip_vs_timeout_user * u)2573 static int ip_vs_set_timeout(struct netns_ipvs *ipvs, struct ip_vs_timeout_user *u)
2574 {
2575 #if defined(CONFIG_IP_VS_PROTO_TCP) || defined(CONFIG_IP_VS_PROTO_UDP)
2576 struct ip_vs_proto_data *pd;
2577 #endif
2578
2579 IP_VS_DBG(2, "Setting timeout tcp:%d tcpfin:%d udp:%d\n",
2580 u->tcp_timeout,
2581 u->tcp_fin_timeout,
2582 u->udp_timeout);
2583
2584 #ifdef CONFIG_IP_VS_PROTO_TCP
2585 if (u->tcp_timeout < 0 || u->tcp_timeout > (INT_MAX / HZ) ||
2586 u->tcp_fin_timeout < 0 || u->tcp_fin_timeout > (INT_MAX / HZ)) {
2587 return -EINVAL;
2588 }
2589 #endif
2590
2591 #ifdef CONFIG_IP_VS_PROTO_UDP
2592 if (u->udp_timeout < 0 || u->udp_timeout > (INT_MAX / HZ))
2593 return -EINVAL;
2594 #endif
2595
2596 #ifdef CONFIG_IP_VS_PROTO_TCP
2597 if (u->tcp_timeout) {
2598 pd = ip_vs_proto_data_get(ipvs, IPPROTO_TCP);
2599 pd->timeout_table[IP_VS_TCP_S_ESTABLISHED]
2600 = u->tcp_timeout * HZ;
2601 }
2602
2603 if (u->tcp_fin_timeout) {
2604 pd = ip_vs_proto_data_get(ipvs, IPPROTO_TCP);
2605 pd->timeout_table[IP_VS_TCP_S_FIN_WAIT]
2606 = u->tcp_fin_timeout * HZ;
2607 }
2608 #endif
2609
2610 #ifdef CONFIG_IP_VS_PROTO_UDP
2611 if (u->udp_timeout) {
2612 pd = ip_vs_proto_data_get(ipvs, IPPROTO_UDP);
2613 pd->timeout_table[IP_VS_UDP_S_NORMAL]
2614 = u->udp_timeout * HZ;
2615 }
2616 #endif
2617 return 0;
2618 }
2619
2620 #define CMDID(cmd) (cmd - IP_VS_BASE_CTL)
2621
2622 struct ip_vs_svcdest_user {
2623 struct ip_vs_service_user s;
2624 struct ip_vs_dest_user d;
2625 };
2626
2627 static const unsigned char set_arglen[CMDID(IP_VS_SO_SET_MAX) + 1] = {
2628 [CMDID(IP_VS_SO_SET_ADD)] = sizeof(struct ip_vs_service_user),
2629 [CMDID(IP_VS_SO_SET_EDIT)] = sizeof(struct ip_vs_service_user),
2630 [CMDID(IP_VS_SO_SET_DEL)] = sizeof(struct ip_vs_service_user),
2631 [CMDID(IP_VS_SO_SET_ADDDEST)] = sizeof(struct ip_vs_svcdest_user),
2632 [CMDID(IP_VS_SO_SET_DELDEST)] = sizeof(struct ip_vs_svcdest_user),
2633 [CMDID(IP_VS_SO_SET_EDITDEST)] = sizeof(struct ip_vs_svcdest_user),
2634 [CMDID(IP_VS_SO_SET_TIMEOUT)] = sizeof(struct ip_vs_timeout_user),
2635 [CMDID(IP_VS_SO_SET_STARTDAEMON)] = sizeof(struct ip_vs_daemon_user),
2636 [CMDID(IP_VS_SO_SET_STOPDAEMON)] = sizeof(struct ip_vs_daemon_user),
2637 [CMDID(IP_VS_SO_SET_ZERO)] = sizeof(struct ip_vs_service_user),
2638 };
2639
2640 union ip_vs_set_arglen {
2641 struct ip_vs_service_user field_IP_VS_SO_SET_ADD;
2642 struct ip_vs_service_user field_IP_VS_SO_SET_EDIT;
2643 struct ip_vs_service_user field_IP_VS_SO_SET_DEL;
2644 struct ip_vs_svcdest_user field_IP_VS_SO_SET_ADDDEST;
2645 struct ip_vs_svcdest_user field_IP_VS_SO_SET_DELDEST;
2646 struct ip_vs_svcdest_user field_IP_VS_SO_SET_EDITDEST;
2647 struct ip_vs_timeout_user field_IP_VS_SO_SET_TIMEOUT;
2648 struct ip_vs_daemon_user field_IP_VS_SO_SET_STARTDAEMON;
2649 struct ip_vs_daemon_user field_IP_VS_SO_SET_STOPDAEMON;
2650 struct ip_vs_service_user field_IP_VS_SO_SET_ZERO;
2651 };
2652
2653 #define MAX_SET_ARGLEN sizeof(union ip_vs_set_arglen)
2654
ip_vs_copy_usvc_compat(struct ip_vs_service_user_kern * usvc,struct ip_vs_service_user * usvc_compat)2655 static void ip_vs_copy_usvc_compat(struct ip_vs_service_user_kern *usvc,
2656 struct ip_vs_service_user *usvc_compat)
2657 {
2658 memset(usvc, 0, sizeof(*usvc));
2659
2660 usvc->af = AF_INET;
2661 usvc->protocol = usvc_compat->protocol;
2662 usvc->addr.ip = usvc_compat->addr;
2663 usvc->port = usvc_compat->port;
2664 usvc->fwmark = usvc_compat->fwmark;
2665
2666 /* Deep copy of sched_name is not needed here */
2667 usvc->sched_name = usvc_compat->sched_name;
2668
2669 usvc->flags = usvc_compat->flags;
2670 usvc->timeout = usvc_compat->timeout;
2671 usvc->netmask = usvc_compat->netmask;
2672 }
2673
ip_vs_copy_udest_compat(struct ip_vs_dest_user_kern * udest,struct ip_vs_dest_user * udest_compat)2674 static void ip_vs_copy_udest_compat(struct ip_vs_dest_user_kern *udest,
2675 struct ip_vs_dest_user *udest_compat)
2676 {
2677 memset(udest, 0, sizeof(*udest));
2678
2679 udest->addr.ip = udest_compat->addr;
2680 udest->port = udest_compat->port;
2681 udest->conn_flags = udest_compat->conn_flags;
2682 udest->weight = udest_compat->weight;
2683 udest->u_threshold = udest_compat->u_threshold;
2684 udest->l_threshold = udest_compat->l_threshold;
2685 udest->af = AF_INET;
2686 udest->tun_type = IP_VS_CONN_F_TUNNEL_TYPE_IPIP;
2687 }
2688
2689 static int
do_ip_vs_set_ctl(struct sock * sk,int cmd,sockptr_t ptr,unsigned int len)2690 do_ip_vs_set_ctl(struct sock *sk, int cmd, sockptr_t ptr, unsigned int len)
2691 {
2692 struct net *net = sock_net(sk);
2693 int ret;
2694 unsigned char arg[MAX_SET_ARGLEN];
2695 struct ip_vs_service_user *usvc_compat;
2696 struct ip_vs_service_user_kern usvc;
2697 struct ip_vs_service *svc;
2698 struct ip_vs_dest_user *udest_compat;
2699 struct ip_vs_dest_user_kern udest;
2700 struct netns_ipvs *ipvs = net_ipvs(net);
2701
2702 BUILD_BUG_ON(sizeof(arg) > 255);
2703 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
2704 return -EPERM;
2705
2706 if (cmd < IP_VS_BASE_CTL || cmd > IP_VS_SO_SET_MAX)
2707 return -EINVAL;
2708 if (len != set_arglen[CMDID(cmd)]) {
2709 IP_VS_DBG(1, "set_ctl: len %u != %u\n",
2710 len, set_arglen[CMDID(cmd)]);
2711 return -EINVAL;
2712 }
2713
2714 if (copy_from_sockptr(arg, ptr, len) != 0)
2715 return -EFAULT;
2716
2717 /* Handle daemons since they have another lock */
2718 if (cmd == IP_VS_SO_SET_STARTDAEMON ||
2719 cmd == IP_VS_SO_SET_STOPDAEMON) {
2720 struct ip_vs_daemon_user *dm = (struct ip_vs_daemon_user *)arg;
2721
2722 if (cmd == IP_VS_SO_SET_STARTDAEMON) {
2723 struct ipvs_sync_daemon_cfg cfg;
2724
2725 memset(&cfg, 0, sizeof(cfg));
2726 ret = -EINVAL;
2727 if (strscpy(cfg.mcast_ifn, dm->mcast_ifn,
2728 sizeof(cfg.mcast_ifn)) <= 0)
2729 return ret;
2730 cfg.syncid = dm->syncid;
2731 ret = start_sync_thread(ipvs, &cfg, dm->state);
2732 } else {
2733 ret = stop_sync_thread(ipvs, dm->state);
2734 }
2735 return ret;
2736 }
2737
2738 mutex_lock(&__ip_vs_mutex);
2739 if (cmd == IP_VS_SO_SET_FLUSH) {
2740 /* Flush the virtual service */
2741 ret = ip_vs_flush(ipvs, false);
2742 goto out_unlock;
2743 } else if (cmd == IP_VS_SO_SET_TIMEOUT) {
2744 /* Set timeout values for (tcp tcpfin udp) */
2745 ret = ip_vs_set_timeout(ipvs, (struct ip_vs_timeout_user *)arg);
2746 goto out_unlock;
2747 } else if (!len) {
2748 /* No more commands with len == 0 below */
2749 ret = -EINVAL;
2750 goto out_unlock;
2751 }
2752
2753 usvc_compat = (struct ip_vs_service_user *)arg;
2754 udest_compat = (struct ip_vs_dest_user *)(usvc_compat + 1);
2755
2756 /* We only use the new structs internally, so copy userspace compat
2757 * structs to extended internal versions */
2758 ip_vs_copy_usvc_compat(&usvc, usvc_compat);
2759 ip_vs_copy_udest_compat(&udest, udest_compat);
2760
2761 if (cmd == IP_VS_SO_SET_ZERO) {
2762 /* if no service address is set, zero counters in all */
2763 if (!usvc.fwmark && !usvc.addr.ip && !usvc.port) {
2764 ret = ip_vs_zero_all(ipvs);
2765 goto out_unlock;
2766 }
2767 }
2768
2769 if ((cmd == IP_VS_SO_SET_ADD || cmd == IP_VS_SO_SET_EDIT) &&
2770 strnlen(usvc.sched_name, IP_VS_SCHEDNAME_MAXLEN) ==
2771 IP_VS_SCHEDNAME_MAXLEN) {
2772 ret = -EINVAL;
2773 goto out_unlock;
2774 }
2775
2776 /* Check for valid protocol: TCP or UDP or SCTP, even for fwmark!=0 */
2777 if (usvc.protocol != IPPROTO_TCP && usvc.protocol != IPPROTO_UDP &&
2778 usvc.protocol != IPPROTO_SCTP) {
2779 pr_err("set_ctl: invalid protocol: %d %pI4:%d\n",
2780 usvc.protocol, &usvc.addr.ip,
2781 ntohs(usvc.port));
2782 ret = -EFAULT;
2783 goto out_unlock;
2784 }
2785
2786 /* Lookup the exact service by <protocol, addr, port> or fwmark */
2787 rcu_read_lock();
2788 if (usvc.fwmark == 0)
2789 svc = __ip_vs_service_find(ipvs, usvc.af, usvc.protocol,
2790 &usvc.addr, usvc.port);
2791 else
2792 svc = __ip_vs_svc_fwm_find(ipvs, usvc.af, usvc.fwmark);
2793 rcu_read_unlock();
2794
2795 if (cmd != IP_VS_SO_SET_ADD
2796 && (svc == NULL || svc->protocol != usvc.protocol)) {
2797 ret = -ESRCH;
2798 goto out_unlock;
2799 }
2800
2801 switch (cmd) {
2802 case IP_VS_SO_SET_ADD:
2803 if (svc != NULL)
2804 ret = -EEXIST;
2805 else
2806 ret = ip_vs_add_service(ipvs, &usvc, &svc);
2807 break;
2808 case IP_VS_SO_SET_EDIT:
2809 ret = ip_vs_edit_service(svc, &usvc);
2810 break;
2811 case IP_VS_SO_SET_DEL:
2812 ret = ip_vs_del_service(svc);
2813 if (!ret)
2814 goto out_unlock;
2815 break;
2816 case IP_VS_SO_SET_ZERO:
2817 ret = ip_vs_zero_service(svc);
2818 break;
2819 case IP_VS_SO_SET_ADDDEST:
2820 ret = ip_vs_add_dest(svc, &udest);
2821 break;
2822 case IP_VS_SO_SET_EDITDEST:
2823 ret = ip_vs_edit_dest(svc, &udest);
2824 break;
2825 case IP_VS_SO_SET_DELDEST:
2826 ret = ip_vs_del_dest(svc, &udest);
2827 break;
2828 default:
2829 WARN_ON_ONCE(1);
2830 ret = -EINVAL;
2831 break;
2832 }
2833
2834 out_unlock:
2835 mutex_unlock(&__ip_vs_mutex);
2836 return ret;
2837 }
2838
2839
2840 static void
ip_vs_copy_service(struct ip_vs_service_entry * dst,struct ip_vs_service * src)2841 ip_vs_copy_service(struct ip_vs_service_entry *dst, struct ip_vs_service *src)
2842 {
2843 struct ip_vs_scheduler *sched;
2844 struct ip_vs_kstats kstats;
2845 char *sched_name;
2846
2847 sched = rcu_dereference_protected(src->scheduler, 1);
2848 sched_name = sched ? sched->name : "none";
2849 dst->protocol = src->protocol;
2850 dst->addr = src->addr.ip;
2851 dst->port = src->port;
2852 dst->fwmark = src->fwmark;
2853 strscpy(dst->sched_name, sched_name, sizeof(dst->sched_name));
2854 dst->flags = src->flags;
2855 dst->timeout = src->timeout / HZ;
2856 dst->netmask = src->netmask;
2857 dst->num_dests = src->num_dests;
2858 ip_vs_copy_stats(&kstats, &src->stats);
2859 ip_vs_export_stats_user(&dst->stats, &kstats);
2860 }
2861
2862 static inline int
__ip_vs_get_service_entries(struct netns_ipvs * ipvs,const struct ip_vs_get_services * get,struct ip_vs_get_services __user * uptr)2863 __ip_vs_get_service_entries(struct netns_ipvs *ipvs,
2864 const struct ip_vs_get_services *get,
2865 struct ip_vs_get_services __user *uptr)
2866 {
2867 int idx, count=0;
2868 struct ip_vs_service *svc;
2869 struct ip_vs_service_entry entry;
2870 int ret = 0;
2871
2872 for (idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
2873 hlist_for_each_entry(svc, &ip_vs_svc_table[idx], s_list) {
2874 /* Only expose IPv4 entries to old interface */
2875 if (svc->af != AF_INET || (svc->ipvs != ipvs))
2876 continue;
2877
2878 if (count >= get->num_services)
2879 goto out;
2880 memset(&entry, 0, sizeof(entry));
2881 ip_vs_copy_service(&entry, svc);
2882 if (copy_to_user(&uptr->entrytable[count],
2883 &entry, sizeof(entry))) {
2884 ret = -EFAULT;
2885 goto out;
2886 }
2887 count++;
2888 }
2889 }
2890
2891 for (idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
2892 hlist_for_each_entry(svc, &ip_vs_svc_fwm_table[idx], f_list) {
2893 /* Only expose IPv4 entries to old interface */
2894 if (svc->af != AF_INET || (svc->ipvs != ipvs))
2895 continue;
2896
2897 if (count >= get->num_services)
2898 goto out;
2899 memset(&entry, 0, sizeof(entry));
2900 ip_vs_copy_service(&entry, svc);
2901 if (copy_to_user(&uptr->entrytable[count],
2902 &entry, sizeof(entry))) {
2903 ret = -EFAULT;
2904 goto out;
2905 }
2906 count++;
2907 }
2908 }
2909 out:
2910 return ret;
2911 }
2912
2913 static inline int
__ip_vs_get_dest_entries(struct netns_ipvs * ipvs,const struct ip_vs_get_dests * get,struct ip_vs_get_dests __user * uptr)2914 __ip_vs_get_dest_entries(struct netns_ipvs *ipvs, const struct ip_vs_get_dests *get,
2915 struct ip_vs_get_dests __user *uptr)
2916 {
2917 struct ip_vs_service *svc;
2918 union nf_inet_addr addr = { .ip = get->addr };
2919 int ret = 0;
2920
2921 rcu_read_lock();
2922 if (get->fwmark)
2923 svc = __ip_vs_svc_fwm_find(ipvs, AF_INET, get->fwmark);
2924 else
2925 svc = __ip_vs_service_find(ipvs, AF_INET, get->protocol, &addr,
2926 get->port);
2927 rcu_read_unlock();
2928
2929 if (svc) {
2930 int count = 0;
2931 struct ip_vs_dest *dest;
2932 struct ip_vs_dest_entry entry;
2933 struct ip_vs_kstats kstats;
2934
2935 memset(&entry, 0, sizeof(entry));
2936 list_for_each_entry(dest, &svc->destinations, n_list) {
2937 if (count >= get->num_dests)
2938 break;
2939
2940 /* Cannot expose heterogeneous members via sockopt
2941 * interface
2942 */
2943 if (dest->af != svc->af)
2944 continue;
2945
2946 entry.addr = dest->addr.ip;
2947 entry.port = dest->port;
2948 entry.conn_flags = atomic_read(&dest->conn_flags);
2949 entry.weight = atomic_read(&dest->weight);
2950 entry.u_threshold = dest->u_threshold;
2951 entry.l_threshold = dest->l_threshold;
2952 entry.activeconns = atomic_read(&dest->activeconns);
2953 entry.inactconns = atomic_read(&dest->inactconns);
2954 entry.persistconns = atomic_read(&dest->persistconns);
2955 ip_vs_copy_stats(&kstats, &dest->stats);
2956 ip_vs_export_stats_user(&entry.stats, &kstats);
2957 if (copy_to_user(&uptr->entrytable[count],
2958 &entry, sizeof(entry))) {
2959 ret = -EFAULT;
2960 break;
2961 }
2962 count++;
2963 }
2964 } else
2965 ret = -ESRCH;
2966 return ret;
2967 }
2968
2969 static inline void
__ip_vs_get_timeouts(struct netns_ipvs * ipvs,struct ip_vs_timeout_user * u)2970 __ip_vs_get_timeouts(struct netns_ipvs *ipvs, struct ip_vs_timeout_user *u)
2971 {
2972 #if defined(CONFIG_IP_VS_PROTO_TCP) || defined(CONFIG_IP_VS_PROTO_UDP)
2973 struct ip_vs_proto_data *pd;
2974 #endif
2975
2976 memset(u, 0, sizeof (*u));
2977
2978 #ifdef CONFIG_IP_VS_PROTO_TCP
2979 pd = ip_vs_proto_data_get(ipvs, IPPROTO_TCP);
2980 u->tcp_timeout = pd->timeout_table[IP_VS_TCP_S_ESTABLISHED] / HZ;
2981 u->tcp_fin_timeout = pd->timeout_table[IP_VS_TCP_S_FIN_WAIT] / HZ;
2982 #endif
2983 #ifdef CONFIG_IP_VS_PROTO_UDP
2984 pd = ip_vs_proto_data_get(ipvs, IPPROTO_UDP);
2985 u->udp_timeout =
2986 pd->timeout_table[IP_VS_UDP_S_NORMAL] / HZ;
2987 #endif
2988 }
2989
2990 static const unsigned char get_arglen[CMDID(IP_VS_SO_GET_MAX) + 1] = {
2991 [CMDID(IP_VS_SO_GET_VERSION)] = 64,
2992 [CMDID(IP_VS_SO_GET_INFO)] = sizeof(struct ip_vs_getinfo),
2993 [CMDID(IP_VS_SO_GET_SERVICES)] = sizeof(struct ip_vs_get_services),
2994 [CMDID(IP_VS_SO_GET_SERVICE)] = sizeof(struct ip_vs_service_entry),
2995 [CMDID(IP_VS_SO_GET_DESTS)] = sizeof(struct ip_vs_get_dests),
2996 [CMDID(IP_VS_SO_GET_TIMEOUT)] = sizeof(struct ip_vs_timeout_user),
2997 [CMDID(IP_VS_SO_GET_DAEMON)] = 2 * sizeof(struct ip_vs_daemon_user),
2998 };
2999
3000 union ip_vs_get_arglen {
3001 char field_IP_VS_SO_GET_VERSION[64];
3002 struct ip_vs_getinfo field_IP_VS_SO_GET_INFO;
3003 struct ip_vs_get_services field_IP_VS_SO_GET_SERVICES;
3004 struct ip_vs_service_entry field_IP_VS_SO_GET_SERVICE;
3005 struct ip_vs_get_dests field_IP_VS_SO_GET_DESTS;
3006 struct ip_vs_timeout_user field_IP_VS_SO_GET_TIMEOUT;
3007 struct ip_vs_daemon_user field_IP_VS_SO_GET_DAEMON[2];
3008 };
3009
3010 #define MAX_GET_ARGLEN sizeof(union ip_vs_get_arglen)
3011
3012 static int
do_ip_vs_get_ctl(struct sock * sk,int cmd,void __user * user,int * len)3013 do_ip_vs_get_ctl(struct sock *sk, int cmd, void __user *user, int *len)
3014 {
3015 unsigned char arg[MAX_GET_ARGLEN];
3016 int ret = 0;
3017 unsigned int copylen;
3018 struct net *net = sock_net(sk);
3019 struct netns_ipvs *ipvs = net_ipvs(net);
3020
3021 BUG_ON(!net);
3022 BUILD_BUG_ON(sizeof(arg) > 255);
3023 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
3024 return -EPERM;
3025
3026 if (cmd < IP_VS_BASE_CTL || cmd > IP_VS_SO_GET_MAX)
3027 return -EINVAL;
3028
3029 copylen = get_arglen[CMDID(cmd)];
3030 if (*len < (int) copylen) {
3031 IP_VS_DBG(1, "get_ctl: len %d < %u\n", *len, copylen);
3032 return -EINVAL;
3033 }
3034
3035 if (copy_from_user(arg, user, copylen) != 0)
3036 return -EFAULT;
3037 /*
3038 * Handle daemons first since it has its own locking
3039 */
3040 if (cmd == IP_VS_SO_GET_DAEMON) {
3041 struct ip_vs_daemon_user d[2];
3042
3043 memset(&d, 0, sizeof(d));
3044 mutex_lock(&ipvs->sync_mutex);
3045 if (ipvs->sync_state & IP_VS_STATE_MASTER) {
3046 d[0].state = IP_VS_STATE_MASTER;
3047 strscpy(d[0].mcast_ifn, ipvs->mcfg.mcast_ifn,
3048 sizeof(d[0].mcast_ifn));
3049 d[0].syncid = ipvs->mcfg.syncid;
3050 }
3051 if (ipvs->sync_state & IP_VS_STATE_BACKUP) {
3052 d[1].state = IP_VS_STATE_BACKUP;
3053 strscpy(d[1].mcast_ifn, ipvs->bcfg.mcast_ifn,
3054 sizeof(d[1].mcast_ifn));
3055 d[1].syncid = ipvs->bcfg.syncid;
3056 }
3057 if (copy_to_user(user, &d, sizeof(d)) != 0)
3058 ret = -EFAULT;
3059 mutex_unlock(&ipvs->sync_mutex);
3060 return ret;
3061 }
3062
3063 mutex_lock(&__ip_vs_mutex);
3064 switch (cmd) {
3065 case IP_VS_SO_GET_VERSION:
3066 {
3067 char buf[64];
3068
3069 sprintf(buf, "IP Virtual Server version %d.%d.%d (size=%d)",
3070 NVERSION(IP_VS_VERSION_CODE), ip_vs_conn_tab_size);
3071 if (copy_to_user(user, buf, strlen(buf)+1) != 0) {
3072 ret = -EFAULT;
3073 goto out;
3074 }
3075 *len = strlen(buf)+1;
3076 }
3077 break;
3078
3079 case IP_VS_SO_GET_INFO:
3080 {
3081 struct ip_vs_getinfo info;
3082 info.version = IP_VS_VERSION_CODE;
3083 info.size = ip_vs_conn_tab_size;
3084 info.num_services = ipvs->num_services;
3085 if (copy_to_user(user, &info, sizeof(info)) != 0)
3086 ret = -EFAULT;
3087 }
3088 break;
3089
3090 case IP_VS_SO_GET_SERVICES:
3091 {
3092 struct ip_vs_get_services *get;
3093 size_t size;
3094
3095 get = (struct ip_vs_get_services *)arg;
3096 size = struct_size(get, entrytable, get->num_services);
3097 if (*len != size) {
3098 pr_err("length: %u != %zu\n", *len, size);
3099 ret = -EINVAL;
3100 goto out;
3101 }
3102 ret = __ip_vs_get_service_entries(ipvs, get, user);
3103 }
3104 break;
3105
3106 case IP_VS_SO_GET_SERVICE:
3107 {
3108 struct ip_vs_service_entry *entry;
3109 struct ip_vs_service *svc;
3110 union nf_inet_addr addr;
3111
3112 entry = (struct ip_vs_service_entry *)arg;
3113 addr.ip = entry->addr;
3114 rcu_read_lock();
3115 if (entry->fwmark)
3116 svc = __ip_vs_svc_fwm_find(ipvs, AF_INET, entry->fwmark);
3117 else
3118 svc = __ip_vs_service_find(ipvs, AF_INET,
3119 entry->protocol, &addr,
3120 entry->port);
3121 rcu_read_unlock();
3122 if (svc) {
3123 ip_vs_copy_service(entry, svc);
3124 if (copy_to_user(user, entry, sizeof(*entry)) != 0)
3125 ret = -EFAULT;
3126 } else
3127 ret = -ESRCH;
3128 }
3129 break;
3130
3131 case IP_VS_SO_GET_DESTS:
3132 {
3133 struct ip_vs_get_dests *get;
3134 size_t size;
3135
3136 get = (struct ip_vs_get_dests *)arg;
3137 size = struct_size(get, entrytable, get->num_dests);
3138 if (*len != size) {
3139 pr_err("length: %u != %zu\n", *len, size);
3140 ret = -EINVAL;
3141 goto out;
3142 }
3143 ret = __ip_vs_get_dest_entries(ipvs, get, user);
3144 }
3145 break;
3146
3147 case IP_VS_SO_GET_TIMEOUT:
3148 {
3149 struct ip_vs_timeout_user t;
3150
3151 __ip_vs_get_timeouts(ipvs, &t);
3152 if (copy_to_user(user, &t, sizeof(t)) != 0)
3153 ret = -EFAULT;
3154 }
3155 break;
3156
3157 default:
3158 ret = -EINVAL;
3159 }
3160
3161 out:
3162 mutex_unlock(&__ip_vs_mutex);
3163 return ret;
3164 }
3165
3166
3167 static struct nf_sockopt_ops ip_vs_sockopts = {
3168 .pf = PF_INET,
3169 .set_optmin = IP_VS_BASE_CTL,
3170 .set_optmax = IP_VS_SO_SET_MAX+1,
3171 .set = do_ip_vs_set_ctl,
3172 .get_optmin = IP_VS_BASE_CTL,
3173 .get_optmax = IP_VS_SO_GET_MAX+1,
3174 .get = do_ip_vs_get_ctl,
3175 .owner = THIS_MODULE,
3176 };
3177
3178 /*
3179 * Generic Netlink interface
3180 */
3181
3182 /* IPVS genetlink family */
3183 static struct genl_family ip_vs_genl_family;
3184
3185 /* Policy used for first-level command attributes */
3186 static const struct nla_policy ip_vs_cmd_policy[IPVS_CMD_ATTR_MAX + 1] = {
3187 [IPVS_CMD_ATTR_SERVICE] = { .type = NLA_NESTED },
3188 [IPVS_CMD_ATTR_DEST] = { .type = NLA_NESTED },
3189 [IPVS_CMD_ATTR_DAEMON] = { .type = NLA_NESTED },
3190 [IPVS_CMD_ATTR_TIMEOUT_TCP] = { .type = NLA_U32 },
3191 [IPVS_CMD_ATTR_TIMEOUT_TCP_FIN] = { .type = NLA_U32 },
3192 [IPVS_CMD_ATTR_TIMEOUT_UDP] = { .type = NLA_U32 },
3193 };
3194
3195 /* Policy used for attributes in nested attribute IPVS_CMD_ATTR_DAEMON */
3196 static const struct nla_policy ip_vs_daemon_policy[IPVS_DAEMON_ATTR_MAX + 1] = {
3197 [IPVS_DAEMON_ATTR_STATE] = { .type = NLA_U32 },
3198 [IPVS_DAEMON_ATTR_MCAST_IFN] = { .type = NLA_NUL_STRING,
3199 .len = IP_VS_IFNAME_MAXLEN - 1 },
3200 [IPVS_DAEMON_ATTR_SYNC_ID] = { .type = NLA_U32 },
3201 [IPVS_DAEMON_ATTR_SYNC_MAXLEN] = { .type = NLA_U16 },
3202 [IPVS_DAEMON_ATTR_MCAST_GROUP] = { .type = NLA_U32 },
3203 [IPVS_DAEMON_ATTR_MCAST_GROUP6] = { .len = sizeof(struct in6_addr) },
3204 [IPVS_DAEMON_ATTR_MCAST_PORT] = { .type = NLA_U16 },
3205 [IPVS_DAEMON_ATTR_MCAST_TTL] = { .type = NLA_U8 },
3206 };
3207
3208 /* Policy used for attributes in nested attribute IPVS_CMD_ATTR_SERVICE */
3209 static const struct nla_policy ip_vs_svc_policy[IPVS_SVC_ATTR_MAX + 1] = {
3210 [IPVS_SVC_ATTR_AF] = { .type = NLA_U16 },
3211 [IPVS_SVC_ATTR_PROTOCOL] = { .type = NLA_U16 },
3212 [IPVS_SVC_ATTR_ADDR] = { .type = NLA_BINARY,
3213 .len = sizeof(union nf_inet_addr) },
3214 [IPVS_SVC_ATTR_PORT] = { .type = NLA_U16 },
3215 [IPVS_SVC_ATTR_FWMARK] = { .type = NLA_U32 },
3216 [IPVS_SVC_ATTR_SCHED_NAME] = { .type = NLA_NUL_STRING,
3217 .len = IP_VS_SCHEDNAME_MAXLEN - 1 },
3218 [IPVS_SVC_ATTR_PE_NAME] = { .type = NLA_NUL_STRING,
3219 .len = IP_VS_PENAME_MAXLEN },
3220 [IPVS_SVC_ATTR_FLAGS] = { .type = NLA_BINARY,
3221 .len = sizeof(struct ip_vs_flags) },
3222 [IPVS_SVC_ATTR_TIMEOUT] = { .type = NLA_U32 },
3223 [IPVS_SVC_ATTR_NETMASK] = { .type = NLA_U32 },
3224 [IPVS_SVC_ATTR_STATS] = { .type = NLA_NESTED },
3225 };
3226
3227 /* Policy used for attributes in nested attribute IPVS_CMD_ATTR_DEST */
3228 static const struct nla_policy ip_vs_dest_policy[IPVS_DEST_ATTR_MAX + 1] = {
3229 [IPVS_DEST_ATTR_ADDR] = { .type = NLA_BINARY,
3230 .len = sizeof(union nf_inet_addr) },
3231 [IPVS_DEST_ATTR_PORT] = { .type = NLA_U16 },
3232 [IPVS_DEST_ATTR_FWD_METHOD] = { .type = NLA_U32 },
3233 [IPVS_DEST_ATTR_WEIGHT] = { .type = NLA_U32 },
3234 [IPVS_DEST_ATTR_U_THRESH] = { .type = NLA_U32 },
3235 [IPVS_DEST_ATTR_L_THRESH] = { .type = NLA_U32 },
3236 [IPVS_DEST_ATTR_ACTIVE_CONNS] = { .type = NLA_U32 },
3237 [IPVS_DEST_ATTR_INACT_CONNS] = { .type = NLA_U32 },
3238 [IPVS_DEST_ATTR_PERSIST_CONNS] = { .type = NLA_U32 },
3239 [IPVS_DEST_ATTR_STATS] = { .type = NLA_NESTED },
3240 [IPVS_DEST_ATTR_ADDR_FAMILY] = { .type = NLA_U16 },
3241 [IPVS_DEST_ATTR_TUN_TYPE] = { .type = NLA_U8 },
3242 [IPVS_DEST_ATTR_TUN_PORT] = { .type = NLA_U16 },
3243 [IPVS_DEST_ATTR_TUN_FLAGS] = { .type = NLA_U16 },
3244 };
3245
ip_vs_genl_fill_stats(struct sk_buff * skb,int container_type,struct ip_vs_kstats * kstats)3246 static int ip_vs_genl_fill_stats(struct sk_buff *skb, int container_type,
3247 struct ip_vs_kstats *kstats)
3248 {
3249 struct nlattr *nl_stats = nla_nest_start_noflag(skb, container_type);
3250
3251 if (!nl_stats)
3252 return -EMSGSIZE;
3253
3254 if (nla_put_u32(skb, IPVS_STATS_ATTR_CONNS, (u32)kstats->conns) ||
3255 nla_put_u32(skb, IPVS_STATS_ATTR_INPKTS, (u32)kstats->inpkts) ||
3256 nla_put_u32(skb, IPVS_STATS_ATTR_OUTPKTS, (u32)kstats->outpkts) ||
3257 nla_put_u64_64bit(skb, IPVS_STATS_ATTR_INBYTES, kstats->inbytes,
3258 IPVS_STATS_ATTR_PAD) ||
3259 nla_put_u64_64bit(skb, IPVS_STATS_ATTR_OUTBYTES, kstats->outbytes,
3260 IPVS_STATS_ATTR_PAD) ||
3261 nla_put_u32(skb, IPVS_STATS_ATTR_CPS, (u32)kstats->cps) ||
3262 nla_put_u32(skb, IPVS_STATS_ATTR_INPPS, (u32)kstats->inpps) ||
3263 nla_put_u32(skb, IPVS_STATS_ATTR_OUTPPS, (u32)kstats->outpps) ||
3264 nla_put_u32(skb, IPVS_STATS_ATTR_INBPS, (u32)kstats->inbps) ||
3265 nla_put_u32(skb, IPVS_STATS_ATTR_OUTBPS, (u32)kstats->outbps))
3266 goto nla_put_failure;
3267 nla_nest_end(skb, nl_stats);
3268
3269 return 0;
3270
3271 nla_put_failure:
3272 nla_nest_cancel(skb, nl_stats);
3273 return -EMSGSIZE;
3274 }
3275
ip_vs_genl_fill_stats64(struct sk_buff * skb,int container_type,struct ip_vs_kstats * kstats)3276 static int ip_vs_genl_fill_stats64(struct sk_buff *skb, int container_type,
3277 struct ip_vs_kstats *kstats)
3278 {
3279 struct nlattr *nl_stats = nla_nest_start_noflag(skb, container_type);
3280
3281 if (!nl_stats)
3282 return -EMSGSIZE;
3283
3284 if (nla_put_u64_64bit(skb, IPVS_STATS_ATTR_CONNS, kstats->conns,
3285 IPVS_STATS_ATTR_PAD) ||
3286 nla_put_u64_64bit(skb, IPVS_STATS_ATTR_INPKTS, kstats->inpkts,
3287 IPVS_STATS_ATTR_PAD) ||
3288 nla_put_u64_64bit(skb, IPVS_STATS_ATTR_OUTPKTS, kstats->outpkts,
3289 IPVS_STATS_ATTR_PAD) ||
3290 nla_put_u64_64bit(skb, IPVS_STATS_ATTR_INBYTES, kstats->inbytes,
3291 IPVS_STATS_ATTR_PAD) ||
3292 nla_put_u64_64bit(skb, IPVS_STATS_ATTR_OUTBYTES, kstats->outbytes,
3293 IPVS_STATS_ATTR_PAD) ||
3294 nla_put_u64_64bit(skb, IPVS_STATS_ATTR_CPS, kstats->cps,
3295 IPVS_STATS_ATTR_PAD) ||
3296 nla_put_u64_64bit(skb, IPVS_STATS_ATTR_INPPS, kstats->inpps,
3297 IPVS_STATS_ATTR_PAD) ||
3298 nla_put_u64_64bit(skb, IPVS_STATS_ATTR_OUTPPS, kstats->outpps,
3299 IPVS_STATS_ATTR_PAD) ||
3300 nla_put_u64_64bit(skb, IPVS_STATS_ATTR_INBPS, kstats->inbps,
3301 IPVS_STATS_ATTR_PAD) ||
3302 nla_put_u64_64bit(skb, IPVS_STATS_ATTR_OUTBPS, kstats->outbps,
3303 IPVS_STATS_ATTR_PAD))
3304 goto nla_put_failure;
3305 nla_nest_end(skb, nl_stats);
3306
3307 return 0;
3308
3309 nla_put_failure:
3310 nla_nest_cancel(skb, nl_stats);
3311 return -EMSGSIZE;
3312 }
3313
ip_vs_genl_fill_service(struct sk_buff * skb,struct ip_vs_service * svc)3314 static int ip_vs_genl_fill_service(struct sk_buff *skb,
3315 struct ip_vs_service *svc)
3316 {
3317 struct ip_vs_scheduler *sched;
3318 struct ip_vs_pe *pe;
3319 struct nlattr *nl_service;
3320 struct ip_vs_flags flags = { .flags = svc->flags,
3321 .mask = ~0 };
3322 struct ip_vs_kstats kstats;
3323 char *sched_name;
3324
3325 nl_service = nla_nest_start_noflag(skb, IPVS_CMD_ATTR_SERVICE);
3326 if (!nl_service)
3327 return -EMSGSIZE;
3328
3329 if (nla_put_u16(skb, IPVS_SVC_ATTR_AF, svc->af))
3330 goto nla_put_failure;
3331 if (svc->fwmark) {
3332 if (nla_put_u32(skb, IPVS_SVC_ATTR_FWMARK, svc->fwmark))
3333 goto nla_put_failure;
3334 } else {
3335 if (nla_put_u16(skb, IPVS_SVC_ATTR_PROTOCOL, svc->protocol) ||
3336 nla_put(skb, IPVS_SVC_ATTR_ADDR, sizeof(svc->addr), &svc->addr) ||
3337 nla_put_be16(skb, IPVS_SVC_ATTR_PORT, svc->port))
3338 goto nla_put_failure;
3339 }
3340
3341 sched = rcu_dereference_protected(svc->scheduler, 1);
3342 sched_name = sched ? sched->name : "none";
3343 pe = rcu_dereference_protected(svc->pe, 1);
3344 if (nla_put_string(skb, IPVS_SVC_ATTR_SCHED_NAME, sched_name) ||
3345 (pe && nla_put_string(skb, IPVS_SVC_ATTR_PE_NAME, pe->name)) ||
3346 nla_put(skb, IPVS_SVC_ATTR_FLAGS, sizeof(flags), &flags) ||
3347 nla_put_u32(skb, IPVS_SVC_ATTR_TIMEOUT, svc->timeout / HZ) ||
3348 nla_put_be32(skb, IPVS_SVC_ATTR_NETMASK, svc->netmask))
3349 goto nla_put_failure;
3350 ip_vs_copy_stats(&kstats, &svc->stats);
3351 if (ip_vs_genl_fill_stats(skb, IPVS_SVC_ATTR_STATS, &kstats))
3352 goto nla_put_failure;
3353 if (ip_vs_genl_fill_stats64(skb, IPVS_SVC_ATTR_STATS64, &kstats))
3354 goto nla_put_failure;
3355
3356 nla_nest_end(skb, nl_service);
3357
3358 return 0;
3359
3360 nla_put_failure:
3361 nla_nest_cancel(skb, nl_service);
3362 return -EMSGSIZE;
3363 }
3364
ip_vs_genl_dump_service(struct sk_buff * skb,struct ip_vs_service * svc,struct netlink_callback * cb)3365 static int ip_vs_genl_dump_service(struct sk_buff *skb,
3366 struct ip_vs_service *svc,
3367 struct netlink_callback *cb)
3368 {
3369 void *hdr;
3370
3371 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
3372 &ip_vs_genl_family, NLM_F_MULTI,
3373 IPVS_CMD_NEW_SERVICE);
3374 if (!hdr)
3375 return -EMSGSIZE;
3376
3377 if (ip_vs_genl_fill_service(skb, svc) < 0)
3378 goto nla_put_failure;
3379
3380 genlmsg_end(skb, hdr);
3381 return 0;
3382
3383 nla_put_failure:
3384 genlmsg_cancel(skb, hdr);
3385 return -EMSGSIZE;
3386 }
3387
ip_vs_genl_dump_services(struct sk_buff * skb,struct netlink_callback * cb)3388 static int ip_vs_genl_dump_services(struct sk_buff *skb,
3389 struct netlink_callback *cb)
3390 {
3391 int idx = 0, i;
3392 int start = cb->args[0];
3393 struct ip_vs_service *svc;
3394 struct net *net = sock_net(skb->sk);
3395 struct netns_ipvs *ipvs = net_ipvs(net);
3396
3397 mutex_lock(&__ip_vs_mutex);
3398 for (i = 0; i < IP_VS_SVC_TAB_SIZE; i++) {
3399 hlist_for_each_entry(svc, &ip_vs_svc_table[i], s_list) {
3400 if (++idx <= start || (svc->ipvs != ipvs))
3401 continue;
3402 if (ip_vs_genl_dump_service(skb, svc, cb) < 0) {
3403 idx--;
3404 goto nla_put_failure;
3405 }
3406 }
3407 }
3408
3409 for (i = 0; i < IP_VS_SVC_TAB_SIZE; i++) {
3410 hlist_for_each_entry(svc, &ip_vs_svc_fwm_table[i], f_list) {
3411 if (++idx <= start || (svc->ipvs != ipvs))
3412 continue;
3413 if (ip_vs_genl_dump_service(skb, svc, cb) < 0) {
3414 idx--;
3415 goto nla_put_failure;
3416 }
3417 }
3418 }
3419
3420 nla_put_failure:
3421 mutex_unlock(&__ip_vs_mutex);
3422 cb->args[0] = idx;
3423
3424 return skb->len;
3425 }
3426
ip_vs_is_af_valid(int af)3427 static bool ip_vs_is_af_valid(int af)
3428 {
3429 if (af == AF_INET)
3430 return true;
3431 #ifdef CONFIG_IP_VS_IPV6
3432 if (af == AF_INET6 && ipv6_mod_enabled())
3433 return true;
3434 #endif
3435 return false;
3436 }
3437
ip_vs_genl_parse_service(struct netns_ipvs * ipvs,struct ip_vs_service_user_kern * usvc,struct nlattr * nla,bool full_entry,struct ip_vs_service ** ret_svc)3438 static int ip_vs_genl_parse_service(struct netns_ipvs *ipvs,
3439 struct ip_vs_service_user_kern *usvc,
3440 struct nlattr *nla, bool full_entry,
3441 struct ip_vs_service **ret_svc)
3442 {
3443 struct nlattr *attrs[IPVS_SVC_ATTR_MAX + 1];
3444 struct nlattr *nla_af, *nla_port, *nla_fwmark, *nla_protocol, *nla_addr;
3445 struct ip_vs_service *svc;
3446
3447 /* Parse mandatory identifying service fields first */
3448 if (nla == NULL ||
3449 nla_parse_nested_deprecated(attrs, IPVS_SVC_ATTR_MAX, nla, ip_vs_svc_policy, NULL))
3450 return -EINVAL;
3451
3452 nla_af = attrs[IPVS_SVC_ATTR_AF];
3453 nla_protocol = attrs[IPVS_SVC_ATTR_PROTOCOL];
3454 nla_addr = attrs[IPVS_SVC_ATTR_ADDR];
3455 nla_port = attrs[IPVS_SVC_ATTR_PORT];
3456 nla_fwmark = attrs[IPVS_SVC_ATTR_FWMARK];
3457
3458 if (!(nla_af && (nla_fwmark || (nla_port && nla_protocol && nla_addr))))
3459 return -EINVAL;
3460
3461 memset(usvc, 0, sizeof(*usvc));
3462
3463 usvc->af = nla_get_u16(nla_af);
3464 if (!ip_vs_is_af_valid(usvc->af))
3465 return -EAFNOSUPPORT;
3466
3467 if (nla_fwmark) {
3468 usvc->protocol = IPPROTO_TCP;
3469 usvc->fwmark = nla_get_u32(nla_fwmark);
3470 } else {
3471 usvc->protocol = nla_get_u16(nla_protocol);
3472 nla_memcpy(&usvc->addr, nla_addr, sizeof(usvc->addr));
3473 usvc->port = nla_get_be16(nla_port);
3474 usvc->fwmark = 0;
3475 }
3476
3477 rcu_read_lock();
3478 if (usvc->fwmark)
3479 svc = __ip_vs_svc_fwm_find(ipvs, usvc->af, usvc->fwmark);
3480 else
3481 svc = __ip_vs_service_find(ipvs, usvc->af, usvc->protocol,
3482 &usvc->addr, usvc->port);
3483 rcu_read_unlock();
3484 *ret_svc = svc;
3485
3486 /* If a full entry was requested, check for the additional fields */
3487 if (full_entry) {
3488 struct nlattr *nla_sched, *nla_flags, *nla_pe, *nla_timeout,
3489 *nla_netmask;
3490 struct ip_vs_flags flags;
3491
3492 nla_sched = attrs[IPVS_SVC_ATTR_SCHED_NAME];
3493 nla_pe = attrs[IPVS_SVC_ATTR_PE_NAME];
3494 nla_flags = attrs[IPVS_SVC_ATTR_FLAGS];
3495 nla_timeout = attrs[IPVS_SVC_ATTR_TIMEOUT];
3496 nla_netmask = attrs[IPVS_SVC_ATTR_NETMASK];
3497
3498 if (!(nla_sched && nla_flags && nla_timeout && nla_netmask))
3499 return -EINVAL;
3500
3501 nla_memcpy(&flags, nla_flags, sizeof(flags));
3502
3503 /* prefill flags from service if it already exists */
3504 if (svc)
3505 usvc->flags = svc->flags;
3506
3507 /* set new flags from userland */
3508 usvc->flags = (usvc->flags & ~flags.mask) |
3509 (flags.flags & flags.mask);
3510 usvc->sched_name = nla_data(nla_sched);
3511 usvc->pe_name = nla_pe ? nla_data(nla_pe) : NULL;
3512 usvc->timeout = nla_get_u32(nla_timeout);
3513 usvc->netmask = nla_get_be32(nla_netmask);
3514 }
3515
3516 return 0;
3517 }
3518
ip_vs_genl_find_service(struct netns_ipvs * ipvs,struct nlattr * nla)3519 static struct ip_vs_service *ip_vs_genl_find_service(struct netns_ipvs *ipvs,
3520 struct nlattr *nla)
3521 {
3522 struct ip_vs_service_user_kern usvc;
3523 struct ip_vs_service *svc;
3524 int ret;
3525
3526 ret = ip_vs_genl_parse_service(ipvs, &usvc, nla, false, &svc);
3527 return ret ? ERR_PTR(ret) : svc;
3528 }
3529
ip_vs_genl_fill_dest(struct sk_buff * skb,struct ip_vs_dest * dest)3530 static int ip_vs_genl_fill_dest(struct sk_buff *skb, struct ip_vs_dest *dest)
3531 {
3532 struct nlattr *nl_dest;
3533 struct ip_vs_kstats kstats;
3534
3535 nl_dest = nla_nest_start_noflag(skb, IPVS_CMD_ATTR_DEST);
3536 if (!nl_dest)
3537 return -EMSGSIZE;
3538
3539 if (nla_put(skb, IPVS_DEST_ATTR_ADDR, sizeof(dest->addr), &dest->addr) ||
3540 nla_put_be16(skb, IPVS_DEST_ATTR_PORT, dest->port) ||
3541 nla_put_u32(skb, IPVS_DEST_ATTR_FWD_METHOD,
3542 (atomic_read(&dest->conn_flags) &
3543 IP_VS_CONN_F_FWD_MASK)) ||
3544 nla_put_u32(skb, IPVS_DEST_ATTR_WEIGHT,
3545 atomic_read(&dest->weight)) ||
3546 nla_put_u8(skb, IPVS_DEST_ATTR_TUN_TYPE,
3547 dest->tun_type) ||
3548 nla_put_be16(skb, IPVS_DEST_ATTR_TUN_PORT,
3549 dest->tun_port) ||
3550 nla_put_u16(skb, IPVS_DEST_ATTR_TUN_FLAGS,
3551 dest->tun_flags) ||
3552 nla_put_u32(skb, IPVS_DEST_ATTR_U_THRESH, dest->u_threshold) ||
3553 nla_put_u32(skb, IPVS_DEST_ATTR_L_THRESH, dest->l_threshold) ||
3554 nla_put_u32(skb, IPVS_DEST_ATTR_ACTIVE_CONNS,
3555 atomic_read(&dest->activeconns)) ||
3556 nla_put_u32(skb, IPVS_DEST_ATTR_INACT_CONNS,
3557 atomic_read(&dest->inactconns)) ||
3558 nla_put_u32(skb, IPVS_DEST_ATTR_PERSIST_CONNS,
3559 atomic_read(&dest->persistconns)) ||
3560 nla_put_u16(skb, IPVS_DEST_ATTR_ADDR_FAMILY, dest->af))
3561 goto nla_put_failure;
3562 ip_vs_copy_stats(&kstats, &dest->stats);
3563 if (ip_vs_genl_fill_stats(skb, IPVS_DEST_ATTR_STATS, &kstats))
3564 goto nla_put_failure;
3565 if (ip_vs_genl_fill_stats64(skb, IPVS_DEST_ATTR_STATS64, &kstats))
3566 goto nla_put_failure;
3567
3568 nla_nest_end(skb, nl_dest);
3569
3570 return 0;
3571
3572 nla_put_failure:
3573 nla_nest_cancel(skb, nl_dest);
3574 return -EMSGSIZE;
3575 }
3576
ip_vs_genl_dump_dest(struct sk_buff * skb,struct ip_vs_dest * dest,struct netlink_callback * cb)3577 static int ip_vs_genl_dump_dest(struct sk_buff *skb, struct ip_vs_dest *dest,
3578 struct netlink_callback *cb)
3579 {
3580 void *hdr;
3581
3582 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
3583 &ip_vs_genl_family, NLM_F_MULTI,
3584 IPVS_CMD_NEW_DEST);
3585 if (!hdr)
3586 return -EMSGSIZE;
3587
3588 if (ip_vs_genl_fill_dest(skb, dest) < 0)
3589 goto nla_put_failure;
3590
3591 genlmsg_end(skb, hdr);
3592 return 0;
3593
3594 nla_put_failure:
3595 genlmsg_cancel(skb, hdr);
3596 return -EMSGSIZE;
3597 }
3598
ip_vs_genl_dump_dests(struct sk_buff * skb,struct netlink_callback * cb)3599 static int ip_vs_genl_dump_dests(struct sk_buff *skb,
3600 struct netlink_callback *cb)
3601 {
3602 int idx = 0;
3603 int start = cb->args[0];
3604 struct ip_vs_service *svc;
3605 struct ip_vs_dest *dest;
3606 struct nlattr *attrs[IPVS_CMD_ATTR_MAX + 1];
3607 struct net *net = sock_net(skb->sk);
3608 struct netns_ipvs *ipvs = net_ipvs(net);
3609
3610 mutex_lock(&__ip_vs_mutex);
3611
3612 /* Try to find the service for which to dump destinations */
3613 if (nlmsg_parse_deprecated(cb->nlh, GENL_HDRLEN, attrs, IPVS_CMD_ATTR_MAX, ip_vs_cmd_policy, cb->extack))
3614 goto out_err;
3615
3616
3617 svc = ip_vs_genl_find_service(ipvs, attrs[IPVS_CMD_ATTR_SERVICE]);
3618 if (IS_ERR_OR_NULL(svc))
3619 goto out_err;
3620
3621 /* Dump the destinations */
3622 list_for_each_entry(dest, &svc->destinations, n_list) {
3623 if (++idx <= start)
3624 continue;
3625 if (ip_vs_genl_dump_dest(skb, dest, cb) < 0) {
3626 idx--;
3627 goto nla_put_failure;
3628 }
3629 }
3630
3631 nla_put_failure:
3632 cb->args[0] = idx;
3633
3634 out_err:
3635 mutex_unlock(&__ip_vs_mutex);
3636
3637 return skb->len;
3638 }
3639
ip_vs_genl_parse_dest(struct ip_vs_dest_user_kern * udest,struct nlattr * nla,bool full_entry)3640 static int ip_vs_genl_parse_dest(struct ip_vs_dest_user_kern *udest,
3641 struct nlattr *nla, bool full_entry)
3642 {
3643 struct nlattr *attrs[IPVS_DEST_ATTR_MAX + 1];
3644 struct nlattr *nla_addr, *nla_port;
3645 struct nlattr *nla_addr_family;
3646
3647 /* Parse mandatory identifying destination fields first */
3648 if (nla == NULL ||
3649 nla_parse_nested_deprecated(attrs, IPVS_DEST_ATTR_MAX, nla, ip_vs_dest_policy, NULL))
3650 return -EINVAL;
3651
3652 nla_addr = attrs[IPVS_DEST_ATTR_ADDR];
3653 nla_port = attrs[IPVS_DEST_ATTR_PORT];
3654 nla_addr_family = attrs[IPVS_DEST_ATTR_ADDR_FAMILY];
3655
3656 if (!(nla_addr && nla_port))
3657 return -EINVAL;
3658
3659 memset(udest, 0, sizeof(*udest));
3660
3661 nla_memcpy(&udest->addr, nla_addr, sizeof(udest->addr));
3662 udest->port = nla_get_be16(nla_port);
3663
3664 udest->af = nla_get_u16_default(nla_addr_family, 0);
3665
3666 /* If a full entry was requested, check for the additional fields */
3667 if (full_entry) {
3668 struct nlattr *nla_fwd, *nla_weight, *nla_u_thresh,
3669 *nla_l_thresh, *nla_tun_type, *nla_tun_port,
3670 *nla_tun_flags;
3671
3672 nla_fwd = attrs[IPVS_DEST_ATTR_FWD_METHOD];
3673 nla_weight = attrs[IPVS_DEST_ATTR_WEIGHT];
3674 nla_u_thresh = attrs[IPVS_DEST_ATTR_U_THRESH];
3675 nla_l_thresh = attrs[IPVS_DEST_ATTR_L_THRESH];
3676 nla_tun_type = attrs[IPVS_DEST_ATTR_TUN_TYPE];
3677 nla_tun_port = attrs[IPVS_DEST_ATTR_TUN_PORT];
3678 nla_tun_flags = attrs[IPVS_DEST_ATTR_TUN_FLAGS];
3679
3680 if (!(nla_fwd && nla_weight && nla_u_thresh && nla_l_thresh))
3681 return -EINVAL;
3682
3683 udest->conn_flags = nla_get_u32(nla_fwd)
3684 & IP_VS_CONN_F_FWD_MASK;
3685 udest->weight = nla_get_u32(nla_weight);
3686 udest->u_threshold = nla_get_u32(nla_u_thresh);
3687 udest->l_threshold = nla_get_u32(nla_l_thresh);
3688
3689 if (nla_tun_type)
3690 udest->tun_type = nla_get_u8(nla_tun_type);
3691
3692 if (nla_tun_port)
3693 udest->tun_port = nla_get_be16(nla_tun_port);
3694
3695 if (nla_tun_flags)
3696 udest->tun_flags = nla_get_u16(nla_tun_flags);
3697 }
3698
3699 return 0;
3700 }
3701
ip_vs_genl_fill_daemon(struct sk_buff * skb,__u32 state,struct ipvs_sync_daemon_cfg * c)3702 static int ip_vs_genl_fill_daemon(struct sk_buff *skb, __u32 state,
3703 struct ipvs_sync_daemon_cfg *c)
3704 {
3705 struct nlattr *nl_daemon;
3706
3707 nl_daemon = nla_nest_start_noflag(skb, IPVS_CMD_ATTR_DAEMON);
3708 if (!nl_daemon)
3709 return -EMSGSIZE;
3710
3711 if (nla_put_u32(skb, IPVS_DAEMON_ATTR_STATE, state) ||
3712 nla_put_string(skb, IPVS_DAEMON_ATTR_MCAST_IFN, c->mcast_ifn) ||
3713 nla_put_u32(skb, IPVS_DAEMON_ATTR_SYNC_ID, c->syncid) ||
3714 nla_put_u16(skb, IPVS_DAEMON_ATTR_SYNC_MAXLEN, c->sync_maxlen) ||
3715 nla_put_u16(skb, IPVS_DAEMON_ATTR_MCAST_PORT, c->mcast_port) ||
3716 nla_put_u8(skb, IPVS_DAEMON_ATTR_MCAST_TTL, c->mcast_ttl))
3717 goto nla_put_failure;
3718 #ifdef CONFIG_IP_VS_IPV6
3719 if (c->mcast_af == AF_INET6) {
3720 if (nla_put_in6_addr(skb, IPVS_DAEMON_ATTR_MCAST_GROUP6,
3721 &c->mcast_group.in6))
3722 goto nla_put_failure;
3723 } else
3724 #endif
3725 if (c->mcast_af == AF_INET &&
3726 nla_put_in_addr(skb, IPVS_DAEMON_ATTR_MCAST_GROUP,
3727 c->mcast_group.ip))
3728 goto nla_put_failure;
3729 nla_nest_end(skb, nl_daemon);
3730
3731 return 0;
3732
3733 nla_put_failure:
3734 nla_nest_cancel(skb, nl_daemon);
3735 return -EMSGSIZE;
3736 }
3737
ip_vs_genl_dump_daemon(struct sk_buff * skb,__u32 state,struct ipvs_sync_daemon_cfg * c,struct netlink_callback * cb)3738 static int ip_vs_genl_dump_daemon(struct sk_buff *skb, __u32 state,
3739 struct ipvs_sync_daemon_cfg *c,
3740 struct netlink_callback *cb)
3741 {
3742 void *hdr;
3743 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
3744 &ip_vs_genl_family, NLM_F_MULTI,
3745 IPVS_CMD_NEW_DAEMON);
3746 if (!hdr)
3747 return -EMSGSIZE;
3748
3749 if (ip_vs_genl_fill_daemon(skb, state, c))
3750 goto nla_put_failure;
3751
3752 genlmsg_end(skb, hdr);
3753 return 0;
3754
3755 nla_put_failure:
3756 genlmsg_cancel(skb, hdr);
3757 return -EMSGSIZE;
3758 }
3759
ip_vs_genl_dump_daemons(struct sk_buff * skb,struct netlink_callback * cb)3760 static int ip_vs_genl_dump_daemons(struct sk_buff *skb,
3761 struct netlink_callback *cb)
3762 {
3763 struct net *net = sock_net(skb->sk);
3764 struct netns_ipvs *ipvs = net_ipvs(net);
3765
3766 mutex_lock(&ipvs->sync_mutex);
3767 if ((ipvs->sync_state & IP_VS_STATE_MASTER) && !cb->args[0]) {
3768 if (ip_vs_genl_dump_daemon(skb, IP_VS_STATE_MASTER,
3769 &ipvs->mcfg, cb) < 0)
3770 goto nla_put_failure;
3771
3772 cb->args[0] = 1;
3773 }
3774
3775 if ((ipvs->sync_state & IP_VS_STATE_BACKUP) && !cb->args[1]) {
3776 if (ip_vs_genl_dump_daemon(skb, IP_VS_STATE_BACKUP,
3777 &ipvs->bcfg, cb) < 0)
3778 goto nla_put_failure;
3779
3780 cb->args[1] = 1;
3781 }
3782
3783 nla_put_failure:
3784 mutex_unlock(&ipvs->sync_mutex);
3785
3786 return skb->len;
3787 }
3788
ip_vs_genl_new_daemon(struct netns_ipvs * ipvs,struct nlattr ** attrs)3789 static int ip_vs_genl_new_daemon(struct netns_ipvs *ipvs, struct nlattr **attrs)
3790 {
3791 struct ipvs_sync_daemon_cfg c;
3792 struct nlattr *a;
3793 int ret;
3794
3795 memset(&c, 0, sizeof(c));
3796 if (!(attrs[IPVS_DAEMON_ATTR_STATE] &&
3797 attrs[IPVS_DAEMON_ATTR_MCAST_IFN] &&
3798 attrs[IPVS_DAEMON_ATTR_SYNC_ID]))
3799 return -EINVAL;
3800 strscpy(c.mcast_ifn, nla_data(attrs[IPVS_DAEMON_ATTR_MCAST_IFN]),
3801 sizeof(c.mcast_ifn));
3802 c.syncid = nla_get_u32(attrs[IPVS_DAEMON_ATTR_SYNC_ID]);
3803
3804 a = attrs[IPVS_DAEMON_ATTR_SYNC_MAXLEN];
3805 if (a)
3806 c.sync_maxlen = nla_get_u16(a);
3807
3808 a = attrs[IPVS_DAEMON_ATTR_MCAST_GROUP];
3809 if (a) {
3810 c.mcast_af = AF_INET;
3811 c.mcast_group.ip = nla_get_in_addr(a);
3812 if (!ipv4_is_multicast(c.mcast_group.ip))
3813 return -EINVAL;
3814 } else {
3815 a = attrs[IPVS_DAEMON_ATTR_MCAST_GROUP6];
3816 if (a) {
3817 #ifdef CONFIG_IP_VS_IPV6
3818 int addr_type;
3819
3820 c.mcast_af = AF_INET6;
3821 c.mcast_group.in6 = nla_get_in6_addr(a);
3822 addr_type = ipv6_addr_type(&c.mcast_group.in6);
3823 if (!(addr_type & IPV6_ADDR_MULTICAST))
3824 return -EINVAL;
3825 #else
3826 return -EAFNOSUPPORT;
3827 #endif
3828 }
3829 }
3830
3831 a = attrs[IPVS_DAEMON_ATTR_MCAST_PORT];
3832 if (a)
3833 c.mcast_port = nla_get_u16(a);
3834
3835 a = attrs[IPVS_DAEMON_ATTR_MCAST_TTL];
3836 if (a)
3837 c.mcast_ttl = nla_get_u8(a);
3838
3839 /* The synchronization protocol is incompatible with mixed family
3840 * services
3841 */
3842 if (ipvs->mixed_address_family_dests > 0)
3843 return -EINVAL;
3844
3845 ret = start_sync_thread(ipvs, &c,
3846 nla_get_u32(attrs[IPVS_DAEMON_ATTR_STATE]));
3847 return ret;
3848 }
3849
ip_vs_genl_del_daemon(struct netns_ipvs * ipvs,struct nlattr ** attrs)3850 static int ip_vs_genl_del_daemon(struct netns_ipvs *ipvs, struct nlattr **attrs)
3851 {
3852 int ret;
3853
3854 if (!attrs[IPVS_DAEMON_ATTR_STATE])
3855 return -EINVAL;
3856
3857 ret = stop_sync_thread(ipvs,
3858 nla_get_u32(attrs[IPVS_DAEMON_ATTR_STATE]));
3859 return ret;
3860 }
3861
ip_vs_genl_set_config(struct netns_ipvs * ipvs,struct nlattr ** attrs)3862 static int ip_vs_genl_set_config(struct netns_ipvs *ipvs, struct nlattr **attrs)
3863 {
3864 struct ip_vs_timeout_user t;
3865
3866 __ip_vs_get_timeouts(ipvs, &t);
3867
3868 if (attrs[IPVS_CMD_ATTR_TIMEOUT_TCP])
3869 t.tcp_timeout = nla_get_u32(attrs[IPVS_CMD_ATTR_TIMEOUT_TCP]);
3870
3871 if (attrs[IPVS_CMD_ATTR_TIMEOUT_TCP_FIN])
3872 t.tcp_fin_timeout =
3873 nla_get_u32(attrs[IPVS_CMD_ATTR_TIMEOUT_TCP_FIN]);
3874
3875 if (attrs[IPVS_CMD_ATTR_TIMEOUT_UDP])
3876 t.udp_timeout = nla_get_u32(attrs[IPVS_CMD_ATTR_TIMEOUT_UDP]);
3877
3878 return ip_vs_set_timeout(ipvs, &t);
3879 }
3880
ip_vs_genl_set_daemon(struct sk_buff * skb,struct genl_info * info)3881 static int ip_vs_genl_set_daemon(struct sk_buff *skb, struct genl_info *info)
3882 {
3883 int ret = -EINVAL, cmd;
3884 struct net *net = sock_net(skb->sk);
3885 struct netns_ipvs *ipvs = net_ipvs(net);
3886
3887 cmd = info->genlhdr->cmd;
3888
3889 if (cmd == IPVS_CMD_NEW_DAEMON || cmd == IPVS_CMD_DEL_DAEMON) {
3890 struct nlattr *daemon_attrs[IPVS_DAEMON_ATTR_MAX + 1];
3891
3892 if (!info->attrs[IPVS_CMD_ATTR_DAEMON] ||
3893 nla_parse_nested_deprecated(daemon_attrs, IPVS_DAEMON_ATTR_MAX, info->attrs[IPVS_CMD_ATTR_DAEMON], ip_vs_daemon_policy, info->extack))
3894 goto out;
3895
3896 if (cmd == IPVS_CMD_NEW_DAEMON)
3897 ret = ip_vs_genl_new_daemon(ipvs, daemon_attrs);
3898 else
3899 ret = ip_vs_genl_del_daemon(ipvs, daemon_attrs);
3900 }
3901
3902 out:
3903 return ret;
3904 }
3905
ip_vs_genl_set_cmd(struct sk_buff * skb,struct genl_info * info)3906 static int ip_vs_genl_set_cmd(struct sk_buff *skb, struct genl_info *info)
3907 {
3908 bool need_full_svc = false, need_full_dest = false;
3909 struct ip_vs_service *svc = NULL;
3910 struct ip_vs_service_user_kern usvc;
3911 struct ip_vs_dest_user_kern udest;
3912 int ret = 0, cmd;
3913 struct net *net = sock_net(skb->sk);
3914 struct netns_ipvs *ipvs = net_ipvs(net);
3915
3916 cmd = info->genlhdr->cmd;
3917
3918 mutex_lock(&__ip_vs_mutex);
3919
3920 if (cmd == IPVS_CMD_FLUSH) {
3921 ret = ip_vs_flush(ipvs, false);
3922 goto out;
3923 } else if (cmd == IPVS_CMD_SET_CONFIG) {
3924 ret = ip_vs_genl_set_config(ipvs, info->attrs);
3925 goto out;
3926 } else if (cmd == IPVS_CMD_ZERO &&
3927 !info->attrs[IPVS_CMD_ATTR_SERVICE]) {
3928 ret = ip_vs_zero_all(ipvs);
3929 goto out;
3930 }
3931
3932 /* All following commands require a service argument, so check if we
3933 * received a valid one. We need a full service specification when
3934 * adding / editing a service. Only identifying members otherwise. */
3935 if (cmd == IPVS_CMD_NEW_SERVICE || cmd == IPVS_CMD_SET_SERVICE)
3936 need_full_svc = true;
3937
3938 ret = ip_vs_genl_parse_service(ipvs, &usvc,
3939 info->attrs[IPVS_CMD_ATTR_SERVICE],
3940 need_full_svc, &svc);
3941 if (ret)
3942 goto out;
3943
3944 /* Unless we're adding a new service, the service must already exist */
3945 if ((cmd != IPVS_CMD_NEW_SERVICE) && (svc == NULL)) {
3946 ret = -ESRCH;
3947 goto out;
3948 }
3949
3950 /* Destination commands require a valid destination argument. For
3951 * adding / editing a destination, we need a full destination
3952 * specification. */
3953 if (cmd == IPVS_CMD_NEW_DEST || cmd == IPVS_CMD_SET_DEST ||
3954 cmd == IPVS_CMD_DEL_DEST) {
3955 if (cmd != IPVS_CMD_DEL_DEST)
3956 need_full_dest = true;
3957
3958 ret = ip_vs_genl_parse_dest(&udest,
3959 info->attrs[IPVS_CMD_ATTR_DEST],
3960 need_full_dest);
3961 if (ret)
3962 goto out;
3963
3964 /* Old protocols did not allow the user to specify address
3965 * family, so we set it to zero instead. We also didn't
3966 * allow heterogeneous pools in the old code, so it's safe
3967 * to assume that this will have the same address family as
3968 * the service.
3969 */
3970 if (udest.af == 0)
3971 udest.af = svc->af;
3972
3973 if (!ip_vs_is_af_valid(udest.af)) {
3974 ret = -EAFNOSUPPORT;
3975 goto out;
3976 }
3977
3978 if (udest.af != svc->af && cmd != IPVS_CMD_DEL_DEST) {
3979 /* The synchronization protocol is incompatible
3980 * with mixed family services
3981 */
3982 if (ipvs->sync_state) {
3983 ret = -EINVAL;
3984 goto out;
3985 }
3986
3987 /* Which connection types do we support? */
3988 switch (udest.conn_flags) {
3989 case IP_VS_CONN_F_TUNNEL:
3990 /* We are able to forward this */
3991 break;
3992 default:
3993 ret = -EINVAL;
3994 goto out;
3995 }
3996 }
3997 }
3998
3999 switch (cmd) {
4000 case IPVS_CMD_NEW_SERVICE:
4001 if (svc == NULL)
4002 ret = ip_vs_add_service(ipvs, &usvc, &svc);
4003 else
4004 ret = -EEXIST;
4005 break;
4006 case IPVS_CMD_SET_SERVICE:
4007 ret = ip_vs_edit_service(svc, &usvc);
4008 break;
4009 case IPVS_CMD_DEL_SERVICE:
4010 ret = ip_vs_del_service(svc);
4011 /* do not use svc, it can be freed */
4012 break;
4013 case IPVS_CMD_NEW_DEST:
4014 ret = ip_vs_add_dest(svc, &udest);
4015 break;
4016 case IPVS_CMD_SET_DEST:
4017 ret = ip_vs_edit_dest(svc, &udest);
4018 break;
4019 case IPVS_CMD_DEL_DEST:
4020 ret = ip_vs_del_dest(svc, &udest);
4021 break;
4022 case IPVS_CMD_ZERO:
4023 ret = ip_vs_zero_service(svc);
4024 break;
4025 default:
4026 ret = -EINVAL;
4027 }
4028
4029 out:
4030 mutex_unlock(&__ip_vs_mutex);
4031
4032 return ret;
4033 }
4034
ip_vs_genl_get_cmd(struct sk_buff * skb,struct genl_info * info)4035 static int ip_vs_genl_get_cmd(struct sk_buff *skb, struct genl_info *info)
4036 {
4037 struct sk_buff *msg;
4038 void *reply;
4039 int ret, cmd, reply_cmd;
4040 struct net *net = sock_net(skb->sk);
4041 struct netns_ipvs *ipvs = net_ipvs(net);
4042
4043 cmd = info->genlhdr->cmd;
4044
4045 if (cmd == IPVS_CMD_GET_SERVICE)
4046 reply_cmd = IPVS_CMD_NEW_SERVICE;
4047 else if (cmd == IPVS_CMD_GET_INFO)
4048 reply_cmd = IPVS_CMD_SET_INFO;
4049 else if (cmd == IPVS_CMD_GET_CONFIG)
4050 reply_cmd = IPVS_CMD_SET_CONFIG;
4051 else {
4052 pr_err("unknown Generic Netlink command\n");
4053 return -EINVAL;
4054 }
4055
4056 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
4057 if (!msg)
4058 return -ENOMEM;
4059
4060 mutex_lock(&__ip_vs_mutex);
4061
4062 reply = genlmsg_put_reply(msg, info, &ip_vs_genl_family, 0, reply_cmd);
4063 if (reply == NULL)
4064 goto nla_put_failure;
4065
4066 switch (cmd) {
4067 case IPVS_CMD_GET_SERVICE:
4068 {
4069 struct ip_vs_service *svc;
4070
4071 svc = ip_vs_genl_find_service(ipvs,
4072 info->attrs[IPVS_CMD_ATTR_SERVICE]);
4073 if (IS_ERR(svc)) {
4074 ret = PTR_ERR(svc);
4075 goto out_err;
4076 } else if (svc) {
4077 ret = ip_vs_genl_fill_service(msg, svc);
4078 if (ret)
4079 goto nla_put_failure;
4080 } else {
4081 ret = -ESRCH;
4082 goto out_err;
4083 }
4084
4085 break;
4086 }
4087
4088 case IPVS_CMD_GET_CONFIG:
4089 {
4090 struct ip_vs_timeout_user t;
4091
4092 __ip_vs_get_timeouts(ipvs, &t);
4093 #ifdef CONFIG_IP_VS_PROTO_TCP
4094 if (nla_put_u32(msg, IPVS_CMD_ATTR_TIMEOUT_TCP,
4095 t.tcp_timeout) ||
4096 nla_put_u32(msg, IPVS_CMD_ATTR_TIMEOUT_TCP_FIN,
4097 t.tcp_fin_timeout))
4098 goto nla_put_failure;
4099 #endif
4100 #ifdef CONFIG_IP_VS_PROTO_UDP
4101 if (nla_put_u32(msg, IPVS_CMD_ATTR_TIMEOUT_UDP, t.udp_timeout))
4102 goto nla_put_failure;
4103 #endif
4104
4105 break;
4106 }
4107
4108 case IPVS_CMD_GET_INFO:
4109 if (nla_put_u32(msg, IPVS_INFO_ATTR_VERSION,
4110 IP_VS_VERSION_CODE) ||
4111 nla_put_u32(msg, IPVS_INFO_ATTR_CONN_TAB_SIZE,
4112 ip_vs_conn_tab_size))
4113 goto nla_put_failure;
4114 break;
4115 }
4116
4117 genlmsg_end(msg, reply);
4118 ret = genlmsg_reply(msg, info);
4119 goto out;
4120
4121 nla_put_failure:
4122 pr_err("not enough space in Netlink message\n");
4123 ret = -EMSGSIZE;
4124
4125 out_err:
4126 nlmsg_free(msg);
4127 out:
4128 mutex_unlock(&__ip_vs_mutex);
4129
4130 return ret;
4131 }
4132
4133
4134 static const struct genl_small_ops ip_vs_genl_ops[] = {
4135 {
4136 .cmd = IPVS_CMD_NEW_SERVICE,
4137 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
4138 .flags = GENL_ADMIN_PERM,
4139 .doit = ip_vs_genl_set_cmd,
4140 },
4141 {
4142 .cmd = IPVS_CMD_SET_SERVICE,
4143 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
4144 .flags = GENL_ADMIN_PERM,
4145 .doit = ip_vs_genl_set_cmd,
4146 },
4147 {
4148 .cmd = IPVS_CMD_DEL_SERVICE,
4149 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
4150 .flags = GENL_ADMIN_PERM,
4151 .doit = ip_vs_genl_set_cmd,
4152 },
4153 {
4154 .cmd = IPVS_CMD_GET_SERVICE,
4155 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
4156 .flags = GENL_ADMIN_PERM,
4157 .doit = ip_vs_genl_get_cmd,
4158 .dumpit = ip_vs_genl_dump_services,
4159 },
4160 {
4161 .cmd = IPVS_CMD_NEW_DEST,
4162 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
4163 .flags = GENL_ADMIN_PERM,
4164 .doit = ip_vs_genl_set_cmd,
4165 },
4166 {
4167 .cmd = IPVS_CMD_SET_DEST,
4168 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
4169 .flags = GENL_ADMIN_PERM,
4170 .doit = ip_vs_genl_set_cmd,
4171 },
4172 {
4173 .cmd = IPVS_CMD_DEL_DEST,
4174 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
4175 .flags = GENL_ADMIN_PERM,
4176 .doit = ip_vs_genl_set_cmd,
4177 },
4178 {
4179 .cmd = IPVS_CMD_GET_DEST,
4180 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
4181 .flags = GENL_ADMIN_PERM,
4182 .dumpit = ip_vs_genl_dump_dests,
4183 },
4184 {
4185 .cmd = IPVS_CMD_NEW_DAEMON,
4186 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
4187 .flags = GENL_ADMIN_PERM,
4188 .doit = ip_vs_genl_set_daemon,
4189 },
4190 {
4191 .cmd = IPVS_CMD_DEL_DAEMON,
4192 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
4193 .flags = GENL_ADMIN_PERM,
4194 .doit = ip_vs_genl_set_daemon,
4195 },
4196 {
4197 .cmd = IPVS_CMD_GET_DAEMON,
4198 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
4199 .flags = GENL_ADMIN_PERM,
4200 .dumpit = ip_vs_genl_dump_daemons,
4201 },
4202 {
4203 .cmd = IPVS_CMD_SET_CONFIG,
4204 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
4205 .flags = GENL_ADMIN_PERM,
4206 .doit = ip_vs_genl_set_cmd,
4207 },
4208 {
4209 .cmd = IPVS_CMD_GET_CONFIG,
4210 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
4211 .flags = GENL_ADMIN_PERM,
4212 .doit = ip_vs_genl_get_cmd,
4213 },
4214 {
4215 .cmd = IPVS_CMD_GET_INFO,
4216 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
4217 .flags = GENL_ADMIN_PERM,
4218 .doit = ip_vs_genl_get_cmd,
4219 },
4220 {
4221 .cmd = IPVS_CMD_ZERO,
4222 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
4223 .flags = GENL_ADMIN_PERM,
4224 .doit = ip_vs_genl_set_cmd,
4225 },
4226 {
4227 .cmd = IPVS_CMD_FLUSH,
4228 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
4229 .flags = GENL_ADMIN_PERM,
4230 .doit = ip_vs_genl_set_cmd,
4231 },
4232 };
4233
4234 static struct genl_family ip_vs_genl_family __ro_after_init = {
4235 .hdrsize = 0,
4236 .name = IPVS_GENL_NAME,
4237 .version = IPVS_GENL_VERSION,
4238 .maxattr = IPVS_CMD_ATTR_MAX,
4239 .policy = ip_vs_cmd_policy,
4240 .netnsok = true, /* Make ipvsadm to work on netns */
4241 .module = THIS_MODULE,
4242 .small_ops = ip_vs_genl_ops,
4243 .n_small_ops = ARRAY_SIZE(ip_vs_genl_ops),
4244 .resv_start_op = IPVS_CMD_FLUSH + 1,
4245 };
4246
ip_vs_genl_register(void)4247 static int __init ip_vs_genl_register(void)
4248 {
4249 return genl_register_family(&ip_vs_genl_family);
4250 }
4251
ip_vs_genl_unregister(void)4252 static void ip_vs_genl_unregister(void)
4253 {
4254 genl_unregister_family(&ip_vs_genl_family);
4255 }
4256
4257 /* End of Generic Netlink interface definitions */
4258
4259 /*
4260 * per netns intit/exit func.
4261 */
4262 #ifdef CONFIG_SYSCTL
ip_vs_control_net_init_sysctl(struct netns_ipvs * ipvs)4263 static int __net_init ip_vs_control_net_init_sysctl(struct netns_ipvs *ipvs)
4264 {
4265 struct net *net = ipvs->net;
4266 struct ctl_table *tbl;
4267 int idx, ret;
4268 size_t ctl_table_size = ARRAY_SIZE(vs_vars);
4269 bool unpriv = net->user_ns != &init_user_ns;
4270
4271 atomic_set(&ipvs->dropentry, 0);
4272 spin_lock_init(&ipvs->dropentry_lock);
4273 spin_lock_init(&ipvs->droppacket_lock);
4274 spin_lock_init(&ipvs->securetcp_lock);
4275 INIT_DELAYED_WORK(&ipvs->defense_work, defense_work_handler);
4276 INIT_DELAYED_WORK(&ipvs->expire_nodest_conn_work,
4277 expire_nodest_conn_handler);
4278 ipvs->est_stopped = 0;
4279
4280 if (!net_eq(net, &init_net)) {
4281 tbl = kmemdup(vs_vars, sizeof(vs_vars), GFP_KERNEL);
4282 if (tbl == NULL)
4283 return -ENOMEM;
4284 } else
4285 tbl = vs_vars;
4286 /* Initialize sysctl defaults */
4287 for (idx = 0; idx < ARRAY_SIZE(vs_vars); idx++) {
4288 if (tbl[idx].proc_handler == proc_do_defense_mode)
4289 tbl[idx].extra2 = ipvs;
4290 }
4291 idx = 0;
4292 ipvs->sysctl_amemthresh = 1024;
4293 tbl[idx++].data = &ipvs->sysctl_amemthresh;
4294 ipvs->sysctl_am_droprate = 10;
4295 tbl[idx++].data = &ipvs->sysctl_am_droprate;
4296 tbl[idx++].data = &ipvs->sysctl_drop_entry;
4297 tbl[idx++].data = &ipvs->sysctl_drop_packet;
4298 #ifdef CONFIG_IP_VS_NFCT
4299 tbl[idx++].data = &ipvs->sysctl_conntrack;
4300 #endif
4301 tbl[idx++].data = &ipvs->sysctl_secure_tcp;
4302 ipvs->sysctl_snat_reroute = 1;
4303 tbl[idx++].data = &ipvs->sysctl_snat_reroute;
4304 ipvs->sysctl_sync_ver = 1;
4305 tbl[idx++].data = &ipvs->sysctl_sync_ver;
4306 ipvs->sysctl_sync_ports = 1;
4307 tbl[idx++].data = &ipvs->sysctl_sync_ports;
4308 tbl[idx++].data = &ipvs->sysctl_sync_persist_mode;
4309
4310 ipvs->sysctl_sync_qlen_max = nr_free_buffer_pages() / 32;
4311 if (unpriv)
4312 tbl[idx].mode = 0444;
4313 tbl[idx++].data = &ipvs->sysctl_sync_qlen_max;
4314
4315 ipvs->sysctl_sync_sock_size = 0;
4316 if (unpriv)
4317 tbl[idx].mode = 0444;
4318 tbl[idx++].data = &ipvs->sysctl_sync_sock_size;
4319
4320 tbl[idx++].data = &ipvs->sysctl_cache_bypass;
4321 tbl[idx++].data = &ipvs->sysctl_expire_nodest_conn;
4322 tbl[idx++].data = &ipvs->sysctl_sloppy_tcp;
4323 tbl[idx++].data = &ipvs->sysctl_sloppy_sctp;
4324 tbl[idx++].data = &ipvs->sysctl_expire_quiescent_template;
4325 ipvs->sysctl_sync_threshold[0] = DEFAULT_SYNC_THRESHOLD;
4326 ipvs->sysctl_sync_threshold[1] = DEFAULT_SYNC_PERIOD;
4327 tbl[idx].data = &ipvs->sysctl_sync_threshold;
4328 tbl[idx].extra2 = ipvs;
4329 tbl[idx++].maxlen = sizeof(ipvs->sysctl_sync_threshold);
4330 ipvs->sysctl_sync_refresh_period = DEFAULT_SYNC_REFRESH_PERIOD;
4331 tbl[idx++].data = &ipvs->sysctl_sync_refresh_period;
4332 ipvs->sysctl_sync_retries = clamp_t(int, DEFAULT_SYNC_RETRIES, 0, 3);
4333 tbl[idx++].data = &ipvs->sysctl_sync_retries;
4334 tbl[idx++].data = &ipvs->sysctl_nat_icmp_send;
4335 ipvs->sysctl_pmtu_disc = 1;
4336 tbl[idx++].data = &ipvs->sysctl_pmtu_disc;
4337 tbl[idx++].data = &ipvs->sysctl_backup_only;
4338 ipvs->sysctl_conn_reuse_mode = 1;
4339 tbl[idx++].data = &ipvs->sysctl_conn_reuse_mode;
4340 tbl[idx++].data = &ipvs->sysctl_schedule_icmp;
4341 tbl[idx++].data = &ipvs->sysctl_ignore_tunneled;
4342
4343 ipvs->sysctl_run_estimation = 1;
4344 if (unpriv)
4345 tbl[idx].mode = 0444;
4346 tbl[idx].extra2 = ipvs;
4347 tbl[idx++].data = &ipvs->sysctl_run_estimation;
4348
4349 ipvs->est_cpulist_valid = 0;
4350 if (unpriv)
4351 tbl[idx].mode = 0444;
4352 tbl[idx].extra2 = ipvs;
4353 tbl[idx++].data = &ipvs->sysctl_est_cpulist;
4354
4355 ipvs->sysctl_est_nice = IPVS_EST_NICE;
4356 if (unpriv)
4357 tbl[idx].mode = 0444;
4358 tbl[idx].extra2 = ipvs;
4359 tbl[idx++].data = &ipvs->sysctl_est_nice;
4360
4361 #ifdef CONFIG_IP_VS_DEBUG
4362 /* Global sysctls must be ro in non-init netns */
4363 if (!net_eq(net, &init_net))
4364 tbl[idx++].mode = 0444;
4365 #endif
4366
4367 ret = -ENOMEM;
4368 ipvs->sysctl_hdr = register_net_sysctl_sz(net, "net/ipv4/vs", tbl,
4369 ctl_table_size);
4370 if (!ipvs->sysctl_hdr)
4371 goto err;
4372 ipvs->sysctl_tbl = tbl;
4373
4374 ret = ip_vs_start_estimator(ipvs, &ipvs->tot_stats->s);
4375 if (ret < 0)
4376 goto err;
4377
4378 /* Schedule defense work */
4379 queue_delayed_work(system_long_wq, &ipvs->defense_work,
4380 DEFENSE_TIMER_PERIOD);
4381
4382 return 0;
4383
4384 err:
4385 unregister_net_sysctl_table(ipvs->sysctl_hdr);
4386 if (!net_eq(net, &init_net))
4387 kfree(tbl);
4388 return ret;
4389 }
4390
ip_vs_control_net_cleanup_sysctl(struct netns_ipvs * ipvs)4391 static void __net_exit ip_vs_control_net_cleanup_sysctl(struct netns_ipvs *ipvs)
4392 {
4393 struct net *net = ipvs->net;
4394
4395 cancel_delayed_work_sync(&ipvs->expire_nodest_conn_work);
4396 cancel_delayed_work_sync(&ipvs->defense_work);
4397 cancel_work_sync(&ipvs->defense_work.work);
4398 unregister_net_sysctl_table(ipvs->sysctl_hdr);
4399 ip_vs_stop_estimator(ipvs, &ipvs->tot_stats->s);
4400
4401 if (ipvs->est_cpulist_valid)
4402 free_cpumask_var(ipvs->sysctl_est_cpulist);
4403
4404 if (!net_eq(net, &init_net))
4405 kfree(ipvs->sysctl_tbl);
4406 }
4407
4408 #else
4409
ip_vs_control_net_init_sysctl(struct netns_ipvs * ipvs)4410 static int __net_init ip_vs_control_net_init_sysctl(struct netns_ipvs *ipvs) { return 0; }
ip_vs_control_net_cleanup_sysctl(struct netns_ipvs * ipvs)4411 static void __net_exit ip_vs_control_net_cleanup_sysctl(struct netns_ipvs *ipvs) { }
4412
4413 #endif
4414
4415 static struct notifier_block ip_vs_dst_notifier = {
4416 .notifier_call = ip_vs_dst_event,
4417 #ifdef CONFIG_IP_VS_IPV6
4418 .priority = ADDRCONF_NOTIFY_PRIORITY + 5,
4419 #endif
4420 };
4421
ip_vs_control_net_init(struct netns_ipvs * ipvs)4422 int __net_init ip_vs_control_net_init(struct netns_ipvs *ipvs)
4423 {
4424 int ret = -ENOMEM;
4425 int idx;
4426
4427 /* Initialize rs_table */
4428 for (idx = 0; idx < IP_VS_RTAB_SIZE; idx++)
4429 INIT_HLIST_HEAD(&ipvs->rs_table[idx]);
4430
4431 INIT_LIST_HEAD(&ipvs->dest_trash);
4432 spin_lock_init(&ipvs->dest_trash_lock);
4433 timer_setup(&ipvs->dest_trash_timer, ip_vs_dest_trash_expire, 0);
4434 atomic_set(&ipvs->ftpsvc_counter, 0);
4435 atomic_set(&ipvs->nullsvc_counter, 0);
4436 atomic_set(&ipvs->conn_out_counter, 0);
4437
4438 INIT_DELAYED_WORK(&ipvs->est_reload_work, est_reload_work_handler);
4439
4440 /* procfs stats */
4441 ipvs->tot_stats = kzalloc_obj(*ipvs->tot_stats);
4442 if (!ipvs->tot_stats)
4443 goto out;
4444 if (ip_vs_stats_init_alloc(&ipvs->tot_stats->s) < 0)
4445 goto err_tot_stats;
4446
4447 #ifdef CONFIG_PROC_FS
4448 if (!proc_create_net("ip_vs", 0, ipvs->net->proc_net,
4449 &ip_vs_info_seq_ops, sizeof(struct ip_vs_iter)))
4450 goto err_vs;
4451 if (!proc_create_net_single("ip_vs_stats", 0, ipvs->net->proc_net,
4452 ip_vs_stats_show, NULL))
4453 goto err_stats;
4454 if (!proc_create_net_single("ip_vs_stats_percpu", 0,
4455 ipvs->net->proc_net,
4456 ip_vs_stats_percpu_show, NULL))
4457 goto err_percpu;
4458 #endif
4459
4460 ret = ip_vs_control_net_init_sysctl(ipvs);
4461 if (ret < 0)
4462 goto err;
4463
4464 return 0;
4465
4466 err:
4467 #ifdef CONFIG_PROC_FS
4468 remove_proc_entry("ip_vs_stats_percpu", ipvs->net->proc_net);
4469
4470 err_percpu:
4471 remove_proc_entry("ip_vs_stats", ipvs->net->proc_net);
4472
4473 err_stats:
4474 remove_proc_entry("ip_vs", ipvs->net->proc_net);
4475
4476 err_vs:
4477 #endif
4478 ip_vs_stats_release(&ipvs->tot_stats->s);
4479
4480 err_tot_stats:
4481 kfree(ipvs->tot_stats);
4482
4483 out:
4484 return ret;
4485 }
4486
ip_vs_control_net_cleanup(struct netns_ipvs * ipvs)4487 void __net_exit ip_vs_control_net_cleanup(struct netns_ipvs *ipvs)
4488 {
4489 ip_vs_trash_cleanup(ipvs);
4490 ip_vs_control_net_cleanup_sysctl(ipvs);
4491 cancel_delayed_work_sync(&ipvs->est_reload_work);
4492 #ifdef CONFIG_PROC_FS
4493 remove_proc_entry("ip_vs_stats_percpu", ipvs->net->proc_net);
4494 remove_proc_entry("ip_vs_stats", ipvs->net->proc_net);
4495 remove_proc_entry("ip_vs", ipvs->net->proc_net);
4496 #endif
4497 call_rcu(&ipvs->tot_stats->rcu_head, ip_vs_stats_rcu_free);
4498 }
4499
ip_vs_register_nl_ioctl(void)4500 int __init ip_vs_register_nl_ioctl(void)
4501 {
4502 int ret;
4503
4504 ret = nf_register_sockopt(&ip_vs_sockopts);
4505 if (ret) {
4506 pr_err("cannot register sockopt.\n");
4507 goto err_sock;
4508 }
4509
4510 ret = ip_vs_genl_register();
4511 if (ret) {
4512 pr_err("cannot register Generic Netlink interface.\n");
4513 goto err_genl;
4514 }
4515 return 0;
4516
4517 err_genl:
4518 nf_unregister_sockopt(&ip_vs_sockopts);
4519 err_sock:
4520 return ret;
4521 }
4522
ip_vs_unregister_nl_ioctl(void)4523 void ip_vs_unregister_nl_ioctl(void)
4524 {
4525 ip_vs_genl_unregister();
4526 nf_unregister_sockopt(&ip_vs_sockopts);
4527 }
4528
ip_vs_control_init(void)4529 int __init ip_vs_control_init(void)
4530 {
4531 int idx;
4532 int ret;
4533
4534 /* Initialize svc_table, ip_vs_svc_fwm_table */
4535 for (idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
4536 INIT_HLIST_HEAD(&ip_vs_svc_table[idx]);
4537 INIT_HLIST_HEAD(&ip_vs_svc_fwm_table[idx]);
4538 }
4539
4540 smp_wmb(); /* Do we really need it now ? */
4541
4542 ret = register_netdevice_notifier(&ip_vs_dst_notifier);
4543 if (ret < 0)
4544 return ret;
4545
4546 return 0;
4547 }
4548
4549
ip_vs_control_cleanup(void)4550 void ip_vs_control_cleanup(void)
4551 {
4552 unregister_netdevice_notifier(&ip_vs_dst_notifier);
4553 /* relying on common rcu_barrier() in ip_vs_cleanup() */
4554 }
4555