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