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Linux/net/netfilter/ipvs/ip_vs_ctl.c

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  1 /*
  2  * IPVS         An implementation of the IP virtual server support for the
  3  *              LINUX operating system.  IPVS is now implemented as a module
  4  *              over the NetFilter framework. IPVS can be used to build a
  5  *              high-performance and highly available server based on a
  6  *              cluster of servers.
  7  *
  8  * Authors:     Wensong Zhang <wensong@linuxvirtualserver.org>
  9  *              Peter Kese <peter.kese@ijs.si>
 10  *              Julian Anastasov <ja@ssi.bg>
 11  *
 12  *              This program is free software; you can redistribute it and/or
 13  *              modify it under the terms of the GNU General Public License
 14  *              as published by the Free Software Foundation; either version
 15  *              2 of the License, or (at your option) any later version.
 16  *
 17  * Changes:
 18  *
 19  */
 20 
 21 #define KMSG_COMPONENT "IPVS"
 22 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
 23 
 24 #include <linux/module.h>
 25 #include <linux/init.h>
 26 #include <linux/types.h>
 27 #include <linux/capability.h>
 28 #include <linux/fs.h>
 29 #include <linux/sysctl.h>
 30 #include <linux/proc_fs.h>
 31 #include <linux/workqueue.h>
 32 #include <linux/swap.h>
 33 #include <linux/seq_file.h>
 34 #include <linux/slab.h>
 35 
 36 #include <linux/netfilter.h>
 37 #include <linux/netfilter_ipv4.h>
 38 #include <linux/mutex.h>
 39 
 40 #include <net/net_namespace.h>
 41 #include <linux/nsproxy.h>
 42 #include <net/ip.h>
 43 #ifdef CONFIG_IP_VS_IPV6
 44 #include <net/ipv6.h>
 45 #include <net/ip6_route.h>
 46 #endif
 47 #include <net/route.h>
 48 #include <net/sock.h>
 49 #include <net/genetlink.h>
 50 
 51 #include <asm/uaccess.h>
 52 
 53 #include <net/ip_vs.h>
 54 
 55 /* semaphore for IPVS sockopts. And, [gs]etsockopt may sleep. */
 56 static DEFINE_MUTEX(__ip_vs_mutex);
 57 
 58 /* sysctl variables */
 59 
 60 #ifdef CONFIG_IP_VS_DEBUG
 61 static int sysctl_ip_vs_debug_level = 0;
 62 
 63 int ip_vs_get_debug_level(void)
 64 {
 65         return sysctl_ip_vs_debug_level;
 66 }
 67 #endif
 68 
 69 
 70 /*  Protos */
 71 static void __ip_vs_del_service(struct ip_vs_service *svc, bool cleanup);
 72 
 73 
 74 #ifdef CONFIG_IP_VS_IPV6
 75 /* Taken from rt6_fill_node() in net/ipv6/route.c, is there a better way? */
 76 static bool __ip_vs_addr_is_local_v6(struct net *net,
 77                                      const struct in6_addr *addr)
 78 {
 79         struct flowi6 fl6 = {
 80                 .daddr = *addr,
 81         };
 82         struct dst_entry *dst = ip6_route_output(net, NULL, &fl6);
 83         bool is_local;
 84 
 85         is_local = !dst->error && dst->dev && (dst->dev->flags & IFF_LOOPBACK);
 86 
 87         dst_release(dst);
 88         return is_local;
 89 }
 90 #endif
 91 
 92 #ifdef CONFIG_SYSCTL
 93 /*
 94  *      update_defense_level is called from keventd and from sysctl,
 95  *      so it needs to protect itself from softirqs
 96  */
 97 static void update_defense_level(struct netns_ipvs *ipvs)
 98 {
 99         struct sysinfo i;
100         static int old_secure_tcp = 0;
101         int availmem;
102         int nomem;
103         int to_change = -1;
104 
105         /* we only count free and buffered memory (in pages) */
106         si_meminfo(&i);
107         availmem = i.freeram + i.bufferram;
108         /* however in linux 2.5 the i.bufferram is total page cache size,
109            we need adjust it */
110         /* si_swapinfo(&i); */
111         /* availmem = availmem - (i.totalswap - i.freeswap); */
112 
113         nomem = (availmem < ipvs->sysctl_amemthresh);
114 
115         local_bh_disable();
116 
117         /* drop_entry */
118         spin_lock(&ipvs->dropentry_lock);
119         switch (ipvs->sysctl_drop_entry) {
120         case 0:
121                 atomic_set(&ipvs->dropentry, 0);
122                 break;
123         case 1:
124                 if (nomem) {
125                         atomic_set(&ipvs->dropentry, 1);
126                         ipvs->sysctl_drop_entry = 2;
127                 } else {
128                         atomic_set(&ipvs->dropentry, 0);
129                 }
130                 break;
131         case 2:
132                 if (nomem) {
133                         atomic_set(&ipvs->dropentry, 1);
134                 } else {
135                         atomic_set(&ipvs->dropentry, 0);
136                         ipvs->sysctl_drop_entry = 1;
137                 };
138                 break;
139         case 3:
140                 atomic_set(&ipvs->dropentry, 1);
141                 break;
142         }
143         spin_unlock(&ipvs->dropentry_lock);
144 
145         /* drop_packet */
146         spin_lock(&ipvs->droppacket_lock);
147         switch (ipvs->sysctl_drop_packet) {
148         case 0:
149                 ipvs->drop_rate = 0;
150                 break;
151         case 1:
152                 if (nomem) {
153                         ipvs->drop_rate = ipvs->drop_counter
154                                 = ipvs->sysctl_amemthresh /
155                                 (ipvs->sysctl_amemthresh-availmem);
156                         ipvs->sysctl_drop_packet = 2;
157                 } else {
158                         ipvs->drop_rate = 0;
159                 }
160                 break;
161         case 2:
162                 if (nomem) {
163                         ipvs->drop_rate = ipvs->drop_counter
164                                 = ipvs->sysctl_amemthresh /
165                                 (ipvs->sysctl_amemthresh-availmem);
166                 } else {
167                         ipvs->drop_rate = 0;
168                         ipvs->sysctl_drop_packet = 1;
169                 }
170                 break;
171         case 3:
172                 ipvs->drop_rate = ipvs->sysctl_am_droprate;
173                 break;
174         }
175         spin_unlock(&ipvs->droppacket_lock);
176 
177         /* secure_tcp */
178         spin_lock(&ipvs->securetcp_lock);
179         switch (ipvs->sysctl_secure_tcp) {
180         case 0:
181                 if (old_secure_tcp >= 2)
182                         to_change = 0;
183                 break;
184         case 1:
185                 if (nomem) {
186                         if (old_secure_tcp < 2)
187                                 to_change = 1;
188                         ipvs->sysctl_secure_tcp = 2;
189                 } else {
190                         if (old_secure_tcp >= 2)
191                                 to_change = 0;
192                 }
193                 break;
194         case 2:
195                 if (nomem) {
196                         if (old_secure_tcp < 2)
197                                 to_change = 1;
198                 } else {
199                         if (old_secure_tcp >= 2)
200                                 to_change = 0;
201                         ipvs->sysctl_secure_tcp = 1;
202                 }
203                 break;
204         case 3:
205                 if (old_secure_tcp < 2)
206                         to_change = 1;
207                 break;
208         }
209         old_secure_tcp = ipvs->sysctl_secure_tcp;
210         if (to_change >= 0)
211                 ip_vs_protocol_timeout_change(ipvs,
212                                               ipvs->sysctl_secure_tcp > 1);
213         spin_unlock(&ipvs->securetcp_lock);
214 
215         local_bh_enable();
216 }
217 
218 
219 /*
220  *      Timer for checking the defense
221  */
222 #define DEFENSE_TIMER_PERIOD    1*HZ
223 
224 static void defense_work_handler(struct work_struct *work)
225 {
226         struct netns_ipvs *ipvs =
227                 container_of(work, struct netns_ipvs, defense_work.work);
228 
229         update_defense_level(ipvs);
230         if (atomic_read(&ipvs->dropentry))
231                 ip_vs_random_dropentry(ipvs->net);
232         schedule_delayed_work(&ipvs->defense_work, DEFENSE_TIMER_PERIOD);
233 }
234 #endif
235 
236 int
237 ip_vs_use_count_inc(void)
238 {
239         return try_module_get(THIS_MODULE);
240 }
241 
242 void
243 ip_vs_use_count_dec(void)
244 {
245         module_put(THIS_MODULE);
246 }
247 
248 
249 /*
250  *      Hash table: for virtual service lookups
251  */
252 #define IP_VS_SVC_TAB_BITS 8
253 #define IP_VS_SVC_TAB_SIZE (1 << IP_VS_SVC_TAB_BITS)
254 #define IP_VS_SVC_TAB_MASK (IP_VS_SVC_TAB_SIZE - 1)
255 
256 /* the service table hashed by <protocol, addr, port> */
257 static struct hlist_head ip_vs_svc_table[IP_VS_SVC_TAB_SIZE];
258 /* the service table hashed by fwmark */
259 static struct hlist_head ip_vs_svc_fwm_table[IP_VS_SVC_TAB_SIZE];
260 
261 
262 /*
263  *      Returns hash value for virtual service
264  */
265 static inline unsigned int
266 ip_vs_svc_hashkey(struct net *net, int af, unsigned int proto,
267                   const union nf_inet_addr *addr, __be16 port)
268 {
269         register unsigned int porth = ntohs(port);
270         __be32 addr_fold = addr->ip;
271         __u32 ahash;
272 
273 #ifdef CONFIG_IP_VS_IPV6
274         if (af == AF_INET6)
275                 addr_fold = addr->ip6[0]^addr->ip6[1]^
276                             addr->ip6[2]^addr->ip6[3];
277 #endif
278         ahash = ntohl(addr_fold);
279         ahash ^= ((size_t) net >> 8);
280 
281         return (proto ^ ahash ^ (porth >> IP_VS_SVC_TAB_BITS) ^ porth) &
282                IP_VS_SVC_TAB_MASK;
283 }
284 
285 /*
286  *      Returns hash value of fwmark for virtual service lookup
287  */
288 static inline unsigned int ip_vs_svc_fwm_hashkey(struct net *net, __u32 fwmark)
289 {
290         return (((size_t)net>>8) ^ fwmark) & IP_VS_SVC_TAB_MASK;
291 }
292 
293 /*
294  *      Hashes a service in the ip_vs_svc_table by <netns,proto,addr,port>
295  *      or in the ip_vs_svc_fwm_table by fwmark.
296  *      Should be called with locked tables.
297  */
298 static int ip_vs_svc_hash(struct ip_vs_service *svc)
299 {
300         unsigned int hash;
301 
302         if (svc->flags & IP_VS_SVC_F_HASHED) {
303                 pr_err("%s(): request for already hashed, called from %pF\n",
304                        __func__, __builtin_return_address(0));
305                 return 0;
306         }
307 
308         if (svc->fwmark == 0) {
309                 /*
310                  *  Hash it by <netns,protocol,addr,port> in ip_vs_svc_table
311                  */
312                 hash = ip_vs_svc_hashkey(svc->net, svc->af, svc->protocol,
313                                          &svc->addr, svc->port);
314                 hlist_add_head_rcu(&svc->s_list, &ip_vs_svc_table[hash]);
315         } else {
316                 /*
317                  *  Hash it by fwmark in svc_fwm_table
318                  */
319                 hash = ip_vs_svc_fwm_hashkey(svc->net, svc->fwmark);
320                 hlist_add_head_rcu(&svc->f_list, &ip_vs_svc_fwm_table[hash]);
321         }
322 
323         svc->flags |= IP_VS_SVC_F_HASHED;
324         /* increase its refcnt because it is referenced by the svc table */
325         atomic_inc(&svc->refcnt);
326         return 1;
327 }
328 
329 
330 /*
331  *      Unhashes a service from svc_table / svc_fwm_table.
332  *      Should be called with locked tables.
333  */
334 static int ip_vs_svc_unhash(struct ip_vs_service *svc)
335 {
336         if (!(svc->flags & IP_VS_SVC_F_HASHED)) {
337                 pr_err("%s(): request for unhash flagged, called from %pF\n",
338                        __func__, __builtin_return_address(0));
339                 return 0;
340         }
341 
342         if (svc->fwmark == 0) {
343                 /* Remove it from the svc_table table */
344                 hlist_del_rcu(&svc->s_list);
345         } else {
346                 /* Remove it from the svc_fwm_table table */
347                 hlist_del_rcu(&svc->f_list);
348         }
349 
350         svc->flags &= ~IP_VS_SVC_F_HASHED;
351         atomic_dec(&svc->refcnt);
352         return 1;
353 }
354 
355 
356 /*
357  *      Get service by {netns, proto,addr,port} in the service table.
358  */
359 static inline struct ip_vs_service *
360 __ip_vs_service_find(struct net *net, int af, __u16 protocol,
361                      const union nf_inet_addr *vaddr, __be16 vport)
362 {
363         unsigned int hash;
364         struct ip_vs_service *svc;
365 
366         /* Check for "full" addressed entries */
367         hash = ip_vs_svc_hashkey(net, af, protocol, vaddr, vport);
368 
369         hlist_for_each_entry_rcu(svc, &ip_vs_svc_table[hash], s_list) {
370                 if ((svc->af == af)
371                     && ip_vs_addr_equal(af, &svc->addr, vaddr)
372                     && (svc->port == vport)
373                     && (svc->protocol == protocol)
374                     && net_eq(svc->net, net)) {
375                         /* HIT */
376                         return svc;
377                 }
378         }
379 
380         return NULL;
381 }
382 
383 
384 /*
385  *      Get service by {fwmark} in the service table.
386  */
387 static inline struct ip_vs_service *
388 __ip_vs_svc_fwm_find(struct net *net, int af, __u32 fwmark)
389 {
390         unsigned int hash;
391         struct ip_vs_service *svc;
392 
393         /* Check for fwmark addressed entries */
394         hash = ip_vs_svc_fwm_hashkey(net, fwmark);
395 
396         hlist_for_each_entry_rcu(svc, &ip_vs_svc_fwm_table[hash], f_list) {
397                 if (svc->fwmark == fwmark && svc->af == af
398                     && net_eq(svc->net, net)) {
399                         /* HIT */
400                         return svc;
401                 }
402         }
403 
404         return NULL;
405 }
406 
407 /* Find service, called under RCU lock */
408 struct ip_vs_service *
409 ip_vs_service_find(struct net *net, int af, __u32 fwmark, __u16 protocol,
410                    const union nf_inet_addr *vaddr, __be16 vport)
411 {
412         struct ip_vs_service *svc;
413         struct netns_ipvs *ipvs = net_ipvs(net);
414 
415         /*
416          *      Check the table hashed by fwmark first
417          */
418         if (fwmark) {
419                 svc = __ip_vs_svc_fwm_find(net, af, fwmark);
420                 if (svc)
421                         goto out;
422         }
423 
424         /*
425          *      Check the table hashed by <protocol,addr,port>
426          *      for "full" addressed entries
427          */
428         svc = __ip_vs_service_find(net, af, protocol, vaddr, vport);
429 
430         if (svc == NULL
431             && protocol == IPPROTO_TCP
432             && atomic_read(&ipvs->ftpsvc_counter)
433             && (vport == FTPDATA || ntohs(vport) >= PROT_SOCK)) {
434                 /*
435                  * Check if ftp service entry exists, the packet
436                  * might belong to FTP data connections.
437                  */
438                 svc = __ip_vs_service_find(net, af, protocol, vaddr, FTPPORT);
439         }
440 
441         if (svc == NULL
442             && atomic_read(&ipvs->nullsvc_counter)) {
443                 /*
444                  * Check if the catch-all port (port zero) exists
445                  */
446                 svc = __ip_vs_service_find(net, af, protocol, vaddr, 0);
447         }
448 
449   out:
450         IP_VS_DBG_BUF(9, "lookup service: fwm %u %s %s:%u %s\n",
451                       fwmark, ip_vs_proto_name(protocol),
452                       IP_VS_DBG_ADDR(af, vaddr), ntohs(vport),
453                       svc ? "hit" : "not hit");
454 
455         return svc;
456 }
457 
458 
459 static inline void
460 __ip_vs_bind_svc(struct ip_vs_dest *dest, struct ip_vs_service *svc)
461 {
462         atomic_inc(&svc->refcnt);
463         dest->svc = svc;
464 }
465 
466 static void ip_vs_service_free(struct ip_vs_service *svc)
467 {
468         if (svc->stats.cpustats)
469                 free_percpu(svc->stats.cpustats);
470         kfree(svc);
471 }
472 
473 static void
474 __ip_vs_unbind_svc(struct ip_vs_dest *dest)
475 {
476         struct ip_vs_service *svc = dest->svc;
477 
478         dest->svc = NULL;
479         if (atomic_dec_and_test(&svc->refcnt)) {
480                 IP_VS_DBG_BUF(3, "Removing service %u/%s:%u\n",
481                               svc->fwmark,
482                               IP_VS_DBG_ADDR(svc->af, &svc->addr),
483                               ntohs(svc->port));
484                 ip_vs_service_free(svc);
485         }
486 }
487 
488 
489 /*
490  *      Returns hash value for real service
491  */
492 static inline unsigned int ip_vs_rs_hashkey(int af,
493                                             const union nf_inet_addr *addr,
494                                             __be16 port)
495 {
496         register unsigned int porth = ntohs(port);
497         __be32 addr_fold = addr->ip;
498 
499 #ifdef CONFIG_IP_VS_IPV6
500         if (af == AF_INET6)
501                 addr_fold = addr->ip6[0]^addr->ip6[1]^
502                             addr->ip6[2]^addr->ip6[3];
503 #endif
504 
505         return (ntohl(addr_fold)^(porth>>IP_VS_RTAB_BITS)^porth)
506                 & IP_VS_RTAB_MASK;
507 }
508 
509 /* Hash ip_vs_dest in rs_table by <proto,addr,port>. */
510 static void ip_vs_rs_hash(struct netns_ipvs *ipvs, struct ip_vs_dest *dest)
511 {
512         unsigned int hash;
513 
514         if (dest->in_rs_table)
515                 return;
516 
517         /*
518          *      Hash by proto,addr,port,
519          *      which are the parameters of the real service.
520          */
521         hash = ip_vs_rs_hashkey(dest->af, &dest->addr, dest->port);
522 
523         hlist_add_head_rcu(&dest->d_list, &ipvs->rs_table[hash]);
524         dest->in_rs_table = 1;
525 }
526 
527 /* Unhash ip_vs_dest from rs_table. */
528 static void ip_vs_rs_unhash(struct ip_vs_dest *dest)
529 {
530         /*
531          * Remove it from the rs_table table.
532          */
533         if (dest->in_rs_table) {
534                 hlist_del_rcu(&dest->d_list);
535                 dest->in_rs_table = 0;
536         }
537 }
538 
539 /* Check if real service by <proto,addr,port> is present */
540 bool ip_vs_has_real_service(struct net *net, int af, __u16 protocol,
541                             const union nf_inet_addr *daddr, __be16 dport)
542 {
543         struct netns_ipvs *ipvs = net_ipvs(net);
544         unsigned int hash;
545         struct ip_vs_dest *dest;
546 
547         /* Check for "full" addressed entries */
548         hash = ip_vs_rs_hashkey(af, daddr, dport);
549 
550         rcu_read_lock();
551         hlist_for_each_entry_rcu(dest, &ipvs->rs_table[hash], d_list) {
552                 if (dest->port == dport &&
553                     dest->af == af &&
554                     ip_vs_addr_equal(af, &dest->addr, daddr) &&
555                     (dest->protocol == protocol || dest->vfwmark)) {
556                         /* HIT */
557                         rcu_read_unlock();
558                         return true;
559                 }
560         }
561         rcu_read_unlock();
562 
563         return false;
564 }
565 
566 /* Lookup destination by {addr,port} in the given service
567  * Called under RCU lock.
568  */
569 static struct ip_vs_dest *
570 ip_vs_lookup_dest(struct ip_vs_service *svc, const union nf_inet_addr *daddr,
571                   __be16 dport)
572 {
573         struct ip_vs_dest *dest;
574 
575         /*
576          * Find the destination for the given service
577          */
578         list_for_each_entry_rcu(dest, &svc->destinations, n_list) {
579                 if ((dest->af == svc->af)
580                     && ip_vs_addr_equal(svc->af, &dest->addr, daddr)
581                     && (dest->port == dport)) {
582                         /* HIT */
583                         return dest;
584                 }
585         }
586 
587         return NULL;
588 }
589 
590 /*
591  * Find destination by {daddr,dport,vaddr,protocol}
592  * Created to be used in ip_vs_process_message() in
593  * the backup synchronization daemon. It finds the
594  * destination to be bound to the received connection
595  * on the backup.
596  * Called under RCU lock, no refcnt is returned.
597  */
598 struct ip_vs_dest *ip_vs_find_dest(struct net  *net, int af,
599                                    const union nf_inet_addr *daddr,
600                                    __be16 dport,
601                                    const union nf_inet_addr *vaddr,
602                                    __be16 vport, __u16 protocol, __u32 fwmark,
603                                    __u32 flags)
604 {
605         struct ip_vs_dest *dest;
606         struct ip_vs_service *svc;
607         __be16 port = dport;
608 
609         svc = ip_vs_service_find(net, af, fwmark, protocol, vaddr, vport);
610         if (!svc)
611                 return NULL;
612         if (fwmark && (flags & IP_VS_CONN_F_FWD_MASK) != IP_VS_CONN_F_MASQ)
613                 port = 0;
614         dest = ip_vs_lookup_dest(svc, daddr, port);
615         if (!dest)
616                 dest = ip_vs_lookup_dest(svc, daddr, port ^ dport);
617         return dest;
618 }
619 
620 void ip_vs_dest_dst_rcu_free(struct rcu_head *head)
621 {
622         struct ip_vs_dest_dst *dest_dst = container_of(head,
623                                                        struct ip_vs_dest_dst,
624                                                        rcu_head);
625 
626         dst_release(dest_dst->dst_cache);
627         kfree(dest_dst);
628 }
629 
630 /* Release dest_dst and dst_cache for dest in user context */
631 static void __ip_vs_dst_cache_reset(struct ip_vs_dest *dest)
632 {
633         struct ip_vs_dest_dst *old;
634 
635         old = rcu_dereference_protected(dest->dest_dst, 1);
636         if (old) {
637                 RCU_INIT_POINTER(dest->dest_dst, NULL);
638                 call_rcu(&old->rcu_head, ip_vs_dest_dst_rcu_free);
639         }
640 }
641 
642 /*
643  *  Lookup dest by {svc,addr,port} in the destination trash.
644  *  The destination trash is used to hold the destinations that are removed
645  *  from the service table but are still referenced by some conn entries.
646  *  The reason to add the destination trash is when the dest is temporary
647  *  down (either by administrator or by monitor program), the dest can be
648  *  picked back from the trash, the remaining connections to the dest can
649  *  continue, and the counting information of the dest is also useful for
650  *  scheduling.
651  */
652 static struct ip_vs_dest *
653 ip_vs_trash_get_dest(struct ip_vs_service *svc, const union nf_inet_addr *daddr,
654                      __be16 dport)
655 {
656         struct ip_vs_dest *dest;
657         struct netns_ipvs *ipvs = net_ipvs(svc->net);
658 
659         /*
660          * Find the destination in trash
661          */
662         spin_lock_bh(&ipvs->dest_trash_lock);
663         list_for_each_entry(dest, &ipvs->dest_trash, t_list) {
664                 IP_VS_DBG_BUF(3, "Destination %u/%s:%u still in trash, "
665                               "dest->refcnt=%d\n",
666                               dest->vfwmark,
667                               IP_VS_DBG_ADDR(svc->af, &dest->addr),
668                               ntohs(dest->port),
669                               atomic_read(&dest->refcnt));
670                 /* We can not reuse dest while in grace period
671                  * because conns still can use dest->svc
672                  */
673                 if (test_bit(IP_VS_DEST_STATE_REMOVING, &dest->state))
674                         continue;
675                 if (dest->af == svc->af &&
676                     ip_vs_addr_equal(svc->af, &dest->addr, daddr) &&
677                     dest->port == dport &&
678                     dest->vfwmark == svc->fwmark &&
679                     dest->protocol == svc->protocol &&
680                     (svc->fwmark ||
681                      (ip_vs_addr_equal(svc->af, &dest->vaddr, &svc->addr) &&
682                       dest->vport == svc->port))) {
683                         /* HIT */
684                         list_del(&dest->t_list);
685                         ip_vs_dest_hold(dest);
686                         goto out;
687                 }
688         }
689 
690         dest = NULL;
691 
692 out:
693         spin_unlock_bh(&ipvs->dest_trash_lock);
694 
695         return dest;
696 }
697 
698 static void ip_vs_dest_free(struct ip_vs_dest *dest)
699 {
700         __ip_vs_dst_cache_reset(dest);
701         __ip_vs_unbind_svc(dest);
702         free_percpu(dest->stats.cpustats);
703         kfree(dest);
704 }
705 
706 /*
707  *  Clean up all the destinations in the trash
708  *  Called by the ip_vs_control_cleanup()
709  *
710  *  When the ip_vs_control_clearup is activated by ipvs module exit,
711  *  the service tables must have been flushed and all the connections
712  *  are expired, and the refcnt of each destination in the trash must
713  *  be 0, so we simply release them here.
714  */
715 static void ip_vs_trash_cleanup(struct net *net)
716 {
717         struct ip_vs_dest *dest, *nxt;
718         struct netns_ipvs *ipvs = net_ipvs(net);
719 
720         del_timer_sync(&ipvs->dest_trash_timer);
721         /* No need to use dest_trash_lock */
722         list_for_each_entry_safe(dest, nxt, &ipvs->dest_trash, t_list) {
723                 list_del(&dest->t_list);
724                 ip_vs_dest_free(dest);
725         }
726 }
727 
728 static void
729 ip_vs_copy_stats(struct ip_vs_stats_user *dst, struct ip_vs_stats *src)
730 {
731 #define IP_VS_SHOW_STATS_COUNTER(c) dst->c = src->ustats.c - src->ustats0.c
732 
733         spin_lock_bh(&src->lock);
734 
735         IP_VS_SHOW_STATS_COUNTER(conns);
736         IP_VS_SHOW_STATS_COUNTER(inpkts);
737         IP_VS_SHOW_STATS_COUNTER(outpkts);
738         IP_VS_SHOW_STATS_COUNTER(inbytes);
739         IP_VS_SHOW_STATS_COUNTER(outbytes);
740 
741         ip_vs_read_estimator(dst, src);
742 
743         spin_unlock_bh(&src->lock);
744 }
745 
746 static void
747 ip_vs_zero_stats(struct ip_vs_stats *stats)
748 {
749         spin_lock_bh(&stats->lock);
750 
751         /* get current counters as zero point, rates are zeroed */
752 
753 #define IP_VS_ZERO_STATS_COUNTER(c) stats->ustats0.c = stats->ustats.c
754 
755         IP_VS_ZERO_STATS_COUNTER(conns);
756         IP_VS_ZERO_STATS_COUNTER(inpkts);
757         IP_VS_ZERO_STATS_COUNTER(outpkts);
758         IP_VS_ZERO_STATS_COUNTER(inbytes);
759         IP_VS_ZERO_STATS_COUNTER(outbytes);
760 
761         ip_vs_zero_estimator(stats);
762 
763         spin_unlock_bh(&stats->lock);
764 }
765 
766 /*
767  *      Update a destination in the given service
768  */
769 static void
770 __ip_vs_update_dest(struct ip_vs_service *svc, struct ip_vs_dest *dest,
771                     struct ip_vs_dest_user_kern *udest, int add)
772 {
773         struct netns_ipvs *ipvs = net_ipvs(svc->net);
774         struct ip_vs_scheduler *sched;
775         int conn_flags;
776 
777         /* set the weight and the flags */
778         atomic_set(&dest->weight, udest->weight);
779         conn_flags = udest->conn_flags & IP_VS_CONN_F_DEST_MASK;
780         conn_flags |= IP_VS_CONN_F_INACTIVE;
781 
782         /* set the IP_VS_CONN_F_NOOUTPUT flag if not masquerading/NAT */
783         if ((conn_flags & IP_VS_CONN_F_FWD_MASK) != IP_VS_CONN_F_MASQ) {
784                 conn_flags |= IP_VS_CONN_F_NOOUTPUT;
785         } else {
786                 /*
787                  *    Put the real service in rs_table if not present.
788                  *    For now only for NAT!
789                  */
790                 ip_vs_rs_hash(ipvs, dest);
791         }
792         atomic_set(&dest->conn_flags, conn_flags);
793 
794         /* bind the service */
795         if (!dest->svc) {
796                 __ip_vs_bind_svc(dest, svc);
797         } else {
798                 if (dest->svc != svc) {
799                         __ip_vs_unbind_svc(dest);
800                         ip_vs_zero_stats(&dest->stats);
801                         __ip_vs_bind_svc(dest, svc);
802                 }
803         }
804 
805         /* set the dest status flags */
806         dest->flags |= IP_VS_DEST_F_AVAILABLE;
807 
808         if (udest->u_threshold == 0 || udest->u_threshold > dest->u_threshold)
809                 dest->flags &= ~IP_VS_DEST_F_OVERLOAD;
810         dest->u_threshold = udest->u_threshold;
811         dest->l_threshold = udest->l_threshold;
812 
813         spin_lock_bh(&dest->dst_lock);
814         __ip_vs_dst_cache_reset(dest);
815         spin_unlock_bh(&dest->dst_lock);
816 
817         sched = rcu_dereference_protected(svc->scheduler, 1);
818         if (add) {
819                 ip_vs_start_estimator(svc->net, &dest->stats);
820                 list_add_rcu(&dest->n_list, &svc->destinations);
821                 svc->num_dests++;
822                 if (sched->add_dest)
823                         sched->add_dest(svc, dest);
824         } else {
825                 if (sched->upd_dest)
826                         sched->upd_dest(svc, dest);
827         }
828 }
829 
830 
831 /*
832  *      Create a destination for the given service
833  */
834 static int
835 ip_vs_new_dest(struct ip_vs_service *svc, struct ip_vs_dest_user_kern *udest,
836                struct ip_vs_dest **dest_p)
837 {
838         struct ip_vs_dest *dest;
839         unsigned int atype;
840 
841         EnterFunction(2);
842 
843 #ifdef CONFIG_IP_VS_IPV6
844         if (svc->af == AF_INET6) {
845                 atype = ipv6_addr_type(&udest->addr.in6);
846                 if ((!(atype & IPV6_ADDR_UNICAST) ||
847                         atype & IPV6_ADDR_LINKLOCAL) &&
848                         !__ip_vs_addr_is_local_v6(svc->net, &udest->addr.in6))
849                         return -EINVAL;
850         } else
851 #endif
852         {
853                 atype = inet_addr_type(svc->net, udest->addr.ip);
854                 if (atype != RTN_LOCAL && atype != RTN_UNICAST)
855                         return -EINVAL;
856         }
857 
858         dest = kzalloc(sizeof(struct ip_vs_dest), GFP_KERNEL);
859         if (dest == NULL)
860                 return -ENOMEM;
861 
862         dest->stats.cpustats = alloc_percpu(struct ip_vs_cpu_stats);
863         if (!dest->stats.cpustats)
864                 goto err_alloc;
865 
866         dest->af = svc->af;
867         dest->protocol = svc->protocol;
868         dest->vaddr = svc->addr;
869         dest->vport = svc->port;
870         dest->vfwmark = svc->fwmark;
871         ip_vs_addr_copy(svc->af, &dest->addr, &udest->addr);
872         dest->port = udest->port;
873 
874         atomic_set(&dest->activeconns, 0);
875         atomic_set(&dest->inactconns, 0);
876         atomic_set(&dest->persistconns, 0);
877         atomic_set(&dest->refcnt, 1);
878 
879         INIT_HLIST_NODE(&dest->d_list);
880         spin_lock_init(&dest->dst_lock);
881         spin_lock_init(&dest->stats.lock);
882         __ip_vs_update_dest(svc, dest, udest, 1);
883 
884         *dest_p = dest;
885 
886         LeaveFunction(2);
887         return 0;
888 
889 err_alloc:
890         kfree(dest);
891         return -ENOMEM;
892 }
893 
894 
895 /*
896  *      Add a destination into an existing service
897  */
898 static int
899 ip_vs_add_dest(struct ip_vs_service *svc, struct ip_vs_dest_user_kern *udest)
900 {
901         struct ip_vs_dest *dest;
902         union nf_inet_addr daddr;
903         __be16 dport = udest->port;
904         int ret;
905 
906         EnterFunction(2);
907 
908         if (udest->weight < 0) {
909                 pr_err("%s(): server weight less than zero\n", __func__);
910                 return -ERANGE;
911         }
912 
913         if (udest->l_threshold > udest->u_threshold) {
914                 pr_err("%s(): lower threshold is higher than upper threshold\n",
915                         __func__);
916                 return -ERANGE;
917         }
918 
919         ip_vs_addr_copy(svc->af, &daddr, &udest->addr);
920 
921         /* We use function that requires RCU lock */
922         rcu_read_lock();
923         dest = ip_vs_lookup_dest(svc, &daddr, dport);
924         rcu_read_unlock();
925 
926         if (dest != NULL) {
927                 IP_VS_DBG(1, "%s(): dest already exists\n", __func__);
928                 return -EEXIST;
929         }
930 
931         /*
932          * Check if the dest already exists in the trash and
933          * is from the same service
934          */
935         dest = ip_vs_trash_get_dest(svc, &daddr, dport);
936 
937         if (dest != NULL) {
938                 IP_VS_DBG_BUF(3, "Get destination %s:%u from trash, "
939                               "dest->refcnt=%d, service %u/%s:%u\n",
940                               IP_VS_DBG_ADDR(svc->af, &daddr), ntohs(dport),
941                               atomic_read(&dest->refcnt),
942                               dest->vfwmark,
943                               IP_VS_DBG_ADDR(svc->af, &dest->vaddr),
944                               ntohs(dest->vport));
945 
946                 __ip_vs_update_dest(svc, dest, udest, 1);
947                 ret = 0;
948         } else {
949                 /*
950                  * Allocate and initialize the dest structure
951                  */
952                 ret = ip_vs_new_dest(svc, udest, &dest);
953         }
954         LeaveFunction(2);
955 
956         return ret;
957 }
958 
959 
960 /*
961  *      Edit a destination in the given service
962  */
963 static int
964 ip_vs_edit_dest(struct ip_vs_service *svc, struct ip_vs_dest_user_kern *udest)
965 {
966         struct ip_vs_dest *dest;
967         union nf_inet_addr daddr;
968         __be16 dport = udest->port;
969 
970         EnterFunction(2);
971 
972         if (udest->weight < 0) {
973                 pr_err("%s(): server weight less than zero\n", __func__);
974                 return -ERANGE;
975         }
976 
977         if (udest->l_threshold > udest->u_threshold) {
978                 pr_err("%s(): lower threshold is higher than upper threshold\n",
979                         __func__);
980                 return -ERANGE;
981         }
982 
983         ip_vs_addr_copy(svc->af, &daddr, &udest->addr);
984 
985         /* We use function that requires RCU lock */
986         rcu_read_lock();
987         dest = ip_vs_lookup_dest(svc, &daddr, dport);
988         rcu_read_unlock();
989 
990         if (dest == NULL) {
991                 IP_VS_DBG(1, "%s(): dest doesn't exist\n", __func__);
992                 return -ENOENT;
993         }
994 
995         __ip_vs_update_dest(svc, dest, udest, 0);
996         LeaveFunction(2);
997 
998         return 0;
999 }
1000 
1001 static void ip_vs_dest_wait_readers(struct rcu_head *head)
1002 {
1003         struct ip_vs_dest *dest = container_of(head, struct ip_vs_dest,
1004                                                rcu_head);
1005 
1006         /* End of grace period after unlinking */
1007         clear_bit(IP_VS_DEST_STATE_REMOVING, &dest->state);
1008 }
1009 
1010 
1011 /*
1012  *      Delete a destination (must be already unlinked from the service)
1013  */
1014 static void __ip_vs_del_dest(struct net *net, struct ip_vs_dest *dest,
1015                              bool cleanup)
1016 {
1017         struct netns_ipvs *ipvs = net_ipvs(net);
1018 
1019         ip_vs_stop_estimator(net, &dest->stats);
1020 
1021         /*
1022          *  Remove it from the d-linked list with the real services.
1023          */
1024         ip_vs_rs_unhash(dest);
1025 
1026         if (!cleanup) {
1027                 set_bit(IP_VS_DEST_STATE_REMOVING, &dest->state);
1028                 call_rcu(&dest->rcu_head, ip_vs_dest_wait_readers);
1029         }
1030 
1031         spin_lock_bh(&ipvs->dest_trash_lock);
1032         IP_VS_DBG_BUF(3, "Moving dest %s:%u into trash, dest->refcnt=%d\n",
1033                       IP_VS_DBG_ADDR(dest->af, &dest->addr), ntohs(dest->port),
1034                       atomic_read(&dest->refcnt));
1035         if (list_empty(&ipvs->dest_trash) && !cleanup)
1036                 mod_timer(&ipvs->dest_trash_timer,
1037                           jiffies + IP_VS_DEST_TRASH_PERIOD);
1038         /* dest lives in trash without reference */
1039         list_add(&dest->t_list, &ipvs->dest_trash);
1040         spin_unlock_bh(&ipvs->dest_trash_lock);
1041         ip_vs_dest_put(dest);
1042 }
1043 
1044 
1045 /*
1046  *      Unlink a destination from the given service
1047  */
1048 static void __ip_vs_unlink_dest(struct ip_vs_service *svc,
1049                                 struct ip_vs_dest *dest,
1050                                 int svcupd)
1051 {
1052         dest->flags &= ~IP_VS_DEST_F_AVAILABLE;
1053 
1054         /*
1055          *  Remove it from the d-linked destination list.
1056          */
1057         list_del_rcu(&dest->n_list);
1058         svc->num_dests--;
1059 
1060         if (svcupd) {
1061                 struct ip_vs_scheduler *sched;
1062 
1063                 sched = rcu_dereference_protected(svc->scheduler, 1);
1064                 if (sched->del_dest)
1065                         sched->del_dest(svc, dest);
1066         }
1067 }
1068 
1069 
1070 /*
1071  *      Delete a destination server in the given service
1072  */
1073 static int
1074 ip_vs_del_dest(struct ip_vs_service *svc, struct ip_vs_dest_user_kern *udest)
1075 {
1076         struct ip_vs_dest *dest;
1077         __be16 dport = udest->port;
1078 
1079         EnterFunction(2);
1080 
1081         /* We use function that requires RCU lock */
1082         rcu_read_lock();
1083         dest = ip_vs_lookup_dest(svc, &udest->addr, dport);
1084         rcu_read_unlock();
1085 
1086         if (dest == NULL) {
1087                 IP_VS_DBG(1, "%s(): destination not found!\n", __func__);
1088                 return -ENOENT;
1089         }
1090 
1091         /*
1092          *      Unlink dest from the service
1093          */
1094         __ip_vs_unlink_dest(svc, dest, 1);
1095 
1096         /*
1097          *      Delete the destination
1098          */
1099         __ip_vs_del_dest(svc->net, dest, false);
1100 
1101         LeaveFunction(2);
1102 
1103         return 0;
1104 }
1105 
1106 static void ip_vs_dest_trash_expire(unsigned long data)
1107 {
1108         struct net *net = (struct net *) data;
1109         struct netns_ipvs *ipvs = net_ipvs(net);
1110         struct ip_vs_dest *dest, *next;
1111 
1112         spin_lock(&ipvs->dest_trash_lock);
1113         list_for_each_entry_safe(dest, next, &ipvs->dest_trash, t_list) {
1114                 /* Skip if dest is in grace period */
1115                 if (test_bit(IP_VS_DEST_STATE_REMOVING, &dest->state))
1116                         continue;
1117                 if (atomic_read(&dest->refcnt) > 0)
1118                         continue;
1119                 IP_VS_DBG_BUF(3, "Removing destination %u/%s:%u from trash\n",
1120                               dest->vfwmark,
1121                               IP_VS_DBG_ADDR(dest->svc->af, &dest->addr),
1122                               ntohs(dest->port));
1123                 list_del(&dest->t_list);
1124                 ip_vs_dest_free(dest);
1125         }
1126         if (!list_empty(&ipvs->dest_trash))
1127                 mod_timer(&ipvs->dest_trash_timer,
1128                           jiffies + IP_VS_DEST_TRASH_PERIOD);
1129         spin_unlock(&ipvs->dest_trash_lock);
1130 }
1131 
1132 /*
1133  *      Add a service into the service hash table
1134  */
1135 static int
1136 ip_vs_add_service(struct net *net, struct ip_vs_service_user_kern *u,
1137                   struct ip_vs_service **svc_p)
1138 {
1139         int ret = 0;
1140         struct ip_vs_scheduler *sched = NULL;
1141         struct ip_vs_pe *pe = NULL;
1142         struct ip_vs_service *svc = NULL;
1143         struct netns_ipvs *ipvs = net_ipvs(net);
1144 
1145         /* increase the module use count */
1146         ip_vs_use_count_inc();
1147 
1148         /* Lookup the scheduler by 'u->sched_name' */
1149         sched = ip_vs_scheduler_get(u->sched_name);
1150         if (sched == NULL) {
1151                 pr_info("Scheduler module ip_vs_%s not found\n", u->sched_name);
1152                 ret = -ENOENT;
1153                 goto out_err;
1154         }
1155 
1156         if (u->pe_name && *u->pe_name) {
1157                 pe = ip_vs_pe_getbyname(u->pe_name);
1158                 if (pe == NULL) {
1159                         pr_info("persistence engine module ip_vs_pe_%s "
1160                                 "not found\n", u->pe_name);
1161                         ret = -ENOENT;
1162                         goto out_err;
1163                 }
1164         }
1165 
1166 #ifdef CONFIG_IP_VS_IPV6
1167         if (u->af == AF_INET6) {
1168                 __u32 plen = (__force __u32) u->netmask;
1169 
1170                 if (plen < 1 || plen > 128) {
1171                         ret = -EINVAL;
1172                         goto out_err;
1173                 }
1174         }
1175 #endif
1176 
1177         svc = kzalloc(sizeof(struct ip_vs_service), GFP_KERNEL);
1178         if (svc == NULL) {
1179                 IP_VS_DBG(1, "%s(): no memory\n", __func__);
1180                 ret = -ENOMEM;
1181                 goto out_err;
1182         }
1183         svc->stats.cpustats = alloc_percpu(struct ip_vs_cpu_stats);
1184         if (!svc->stats.cpustats) {
1185                 ret = -ENOMEM;
1186                 goto out_err;
1187         }
1188 
1189         /* I'm the first user of the service */
1190         atomic_set(&svc->refcnt, 0);
1191 
1192         svc->af = u->af;
1193         svc->protocol = u->protocol;
1194         ip_vs_addr_copy(svc->af, &svc->addr, &u->addr);
1195         svc->port = u->port;
1196         svc->fwmark = u->fwmark;
1197         svc->flags = u->flags;
1198         svc->timeout = u->timeout * HZ;
1199         svc->netmask = u->netmask;
1200         svc->net = net;
1201 
1202         INIT_LIST_HEAD(&svc->destinations);
1203         spin_lock_init(&svc->sched_lock);
1204         spin_lock_init(&svc->stats.lock);
1205 
1206         /* Bind the scheduler */
1207         ret = ip_vs_bind_scheduler(svc, sched);
1208         if (ret)
1209                 goto out_err;
1210         sched = NULL;
1211 
1212         /* Bind the ct retriever */
1213         RCU_INIT_POINTER(svc->pe, pe);
1214         pe = NULL;
1215 
1216         /* Update the virtual service counters */
1217         if (svc->port == FTPPORT)
1218                 atomic_inc(&ipvs->ftpsvc_counter);
1219         else if (svc->port == 0)
1220                 atomic_inc(&ipvs->nullsvc_counter);
1221 
1222         ip_vs_start_estimator(net, &svc->stats);
1223 
1224         /* Count only IPv4 services for old get/setsockopt interface */
1225         if (svc->af == AF_INET)
1226                 ipvs->num_services++;
1227 
1228         /* Hash the service into the service table */
1229         ip_vs_svc_hash(svc);
1230 
1231         *svc_p = svc;
1232         /* Now there is a service - full throttle */
1233         ipvs->enable = 1;
1234         return 0;
1235 
1236 
1237  out_err:
1238         if (svc != NULL) {
1239                 ip_vs_unbind_scheduler(svc, sched);
1240                 ip_vs_service_free(svc);
1241         }
1242         ip_vs_scheduler_put(sched);
1243         ip_vs_pe_put(pe);
1244 
1245         /* decrease the module use count */
1246         ip_vs_use_count_dec();
1247 
1248         return ret;
1249 }
1250 
1251 
1252 /*
1253  *      Edit a service and bind it with a new scheduler
1254  */
1255 static int
1256 ip_vs_edit_service(struct ip_vs_service *svc, struct ip_vs_service_user_kern *u)
1257 {
1258         struct ip_vs_scheduler *sched, *old_sched;
1259         struct ip_vs_pe *pe = NULL, *old_pe = NULL;
1260         int ret = 0;
1261 
1262         /*
1263          * Lookup the scheduler, by 'u->sched_name'
1264          */
1265         sched = ip_vs_scheduler_get(u->sched_name);
1266         if (sched == NULL) {
1267                 pr_info("Scheduler module ip_vs_%s not found\n", u->sched_name);
1268                 return -ENOENT;
1269         }
1270         old_sched = sched;
1271 
1272         if (u->pe_name && *u->pe_name) {
1273                 pe = ip_vs_pe_getbyname(u->pe_name);
1274                 if (pe == NULL) {
1275                         pr_info("persistence engine module ip_vs_pe_%s "
1276                                 "not found\n", u->pe_name);
1277                         ret = -ENOENT;
1278                         goto out;
1279                 }
1280                 old_pe = pe;
1281         }
1282 
1283 #ifdef CONFIG_IP_VS_IPV6
1284         if (u->af == AF_INET6) {
1285                 __u32 plen = (__force __u32) u->netmask;
1286 
1287                 if (plen < 1 || plen > 128) {
1288                         ret = -EINVAL;
1289                         goto out;
1290                 }
1291         }
1292 #endif
1293 
1294         old_sched = rcu_dereference_protected(svc->scheduler, 1);
1295         if (sched != old_sched) {
1296                 /* Bind the new scheduler */
1297                 ret = ip_vs_bind_scheduler(svc, sched);
1298                 if (ret) {
1299                         old_sched = sched;
1300                         goto out;
1301                 }
1302                 /* Unbind the old scheduler on success */
1303                 ip_vs_unbind_scheduler(svc, old_sched);
1304         }
1305 
1306         /*
1307          * Set the flags and timeout value
1308          */
1309         svc->flags = u->flags | IP_VS_SVC_F_HASHED;
1310         svc->timeout = u->timeout * HZ;
1311         svc->netmask = u->netmask;
1312 
1313         old_pe = rcu_dereference_protected(svc->pe, 1);
1314         if (pe != old_pe)
1315                 rcu_assign_pointer(svc->pe, pe);
1316 
1317 out:
1318         ip_vs_scheduler_put(old_sched);
1319         ip_vs_pe_put(old_pe);
1320         return ret;
1321 }
1322 
1323 static void ip_vs_service_rcu_free(struct rcu_head *head)
1324 {
1325         struct ip_vs_service *svc;
1326 
1327         svc = container_of(head, struct ip_vs_service, rcu_head);
1328         ip_vs_service_free(svc);
1329 }
1330 
1331 /*
1332  *      Delete a service from the service list
1333  *      - The service must be unlinked, unlocked and not referenced!
1334  *      - We are called under _bh lock
1335  */
1336 static void __ip_vs_del_service(struct ip_vs_service *svc, bool cleanup)
1337 {
1338         struct ip_vs_dest *dest, *nxt;
1339         struct ip_vs_scheduler *old_sched;
1340         struct ip_vs_pe *old_pe;
1341         struct netns_ipvs *ipvs = net_ipvs(svc->net);
1342 
1343         pr_info("%s: enter\n", __func__);
1344 
1345         /* Count only IPv4 services for old get/setsockopt interface */
1346         if (svc->af == AF_INET)
1347                 ipvs->num_services--;
1348 
1349         ip_vs_stop_estimator(svc->net, &svc->stats);
1350 
1351         /* Unbind scheduler */
1352         old_sched = rcu_dereference_protected(svc->scheduler, 1);
1353         ip_vs_unbind_scheduler(svc, old_sched);
1354         ip_vs_scheduler_put(old_sched);
1355 
1356         /* Unbind persistence engine, keep svc->pe */
1357         old_pe = rcu_dereference_protected(svc->pe, 1);
1358         ip_vs_pe_put(old_pe);
1359 
1360         /*
1361          *    Unlink the whole destination list
1362          */
1363         list_for_each_entry_safe(dest, nxt, &svc->destinations, n_list) {
1364                 __ip_vs_unlink_dest(svc, dest, 0);
1365                 __ip_vs_del_dest(svc->net, dest, cleanup);
1366         }
1367 
1368         /*
1369          *    Update the virtual service counters
1370          */
1371         if (svc->port == FTPPORT)
1372                 atomic_dec(&ipvs->ftpsvc_counter);
1373         else if (svc->port == 0)
1374                 atomic_dec(&ipvs->nullsvc_counter);
1375 
1376         /*
1377          *    Free the service if nobody refers to it
1378          */
1379         if (atomic_dec_and_test(&svc->refcnt)) {
1380                 IP_VS_DBG_BUF(3, "Removing service %u/%s:%u\n",
1381                               svc->fwmark,
1382                               IP_VS_DBG_ADDR(svc->af, &svc->addr),
1383                               ntohs(svc->port));
1384                 call_rcu(&svc->rcu_head, ip_vs_service_rcu_free);
1385         }
1386 
1387         /* decrease the module use count */
1388         ip_vs_use_count_dec();
1389 }
1390 
1391 /*
1392  * Unlink a service from list and try to delete it if its refcnt reached 0
1393  */
1394 static void ip_vs_unlink_service(struct ip_vs_service *svc, bool cleanup)
1395 {
1396         /* Hold svc to avoid double release from dest_trash */
1397         atomic_inc(&svc->refcnt);
1398         /*
1399          * Unhash it from the service table
1400          */
1401         ip_vs_svc_unhash(svc);
1402 
1403         __ip_vs_del_service(svc, cleanup);
1404 }
1405 
1406 /*
1407  *      Delete a service from the service list
1408  */
1409 static int ip_vs_del_service(struct ip_vs_service *svc)
1410 {
1411         if (svc == NULL)
1412                 return -EEXIST;
1413         ip_vs_unlink_service(svc, false);
1414 
1415         return 0;
1416 }
1417 
1418 
1419 /*
1420  *      Flush all the virtual services
1421  */
1422 static int ip_vs_flush(struct net *net, bool cleanup)
1423 {
1424         int idx;
1425         struct ip_vs_service *svc;
1426         struct hlist_node *n;
1427 
1428         /*
1429          * Flush the service table hashed by <netns,protocol,addr,port>
1430          */
1431         for(idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
1432                 hlist_for_each_entry_safe(svc, n, &ip_vs_svc_table[idx],
1433                                           s_list) {
1434                         if (net_eq(svc->net, net))
1435                                 ip_vs_unlink_service(svc, cleanup);
1436                 }
1437         }
1438 
1439         /*
1440          * Flush the service table hashed by fwmark
1441          */
1442         for(idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
1443                 hlist_for_each_entry_safe(svc, n, &ip_vs_svc_fwm_table[idx],
1444                                           f_list) {
1445                         if (net_eq(svc->net, net))
1446                                 ip_vs_unlink_service(svc, cleanup);
1447                 }
1448         }
1449 
1450         return 0;
1451 }
1452 
1453 /*
1454  *      Delete service by {netns} in the service table.
1455  *      Called by __ip_vs_cleanup()
1456  */
1457 void ip_vs_service_net_cleanup(struct net *net)
1458 {
1459         EnterFunction(2);
1460         /* Check for "full" addressed entries */
1461         mutex_lock(&__ip_vs_mutex);
1462         ip_vs_flush(net, true);
1463         mutex_unlock(&__ip_vs_mutex);
1464         LeaveFunction(2);
1465 }
1466 
1467 /* Put all references for device (dst_cache) */
1468 static inline void
1469 ip_vs_forget_dev(struct ip_vs_dest *dest, struct net_device *dev)
1470 {
1471         struct ip_vs_dest_dst *dest_dst;
1472 
1473         spin_lock_bh(&dest->dst_lock);
1474         dest_dst = rcu_dereference_protected(dest->dest_dst, 1);
1475         if (dest_dst && dest_dst->dst_cache->dev == dev) {
1476                 IP_VS_DBG_BUF(3, "Reset dev:%s dest %s:%u ,dest->refcnt=%d\n",
1477                               dev->name,
1478                               IP_VS_DBG_ADDR(dest->af, &dest->addr),
1479                               ntohs(dest->port),
1480                               atomic_read(&dest->refcnt));
1481                 __ip_vs_dst_cache_reset(dest);
1482         }
1483         spin_unlock_bh(&dest->dst_lock);
1484 
1485 }
1486 /* Netdev event receiver
1487  * Currently only NETDEV_DOWN is handled to release refs to cached dsts
1488  */
1489 static int ip_vs_dst_event(struct notifier_block *this, unsigned long event,
1490                             void *ptr)
1491 {
1492         struct net_device *dev = ptr;
1493         struct net *net = dev_net(dev);
1494         struct netns_ipvs *ipvs = net_ipvs(net);
1495         struct ip_vs_service *svc;
1496         struct ip_vs_dest *dest;
1497         unsigned int idx;
1498 
1499         if (event != NETDEV_DOWN || !ipvs)
1500                 return NOTIFY_DONE;
1501         IP_VS_DBG(3, "%s() dev=%s\n", __func__, dev->name);
1502         EnterFunction(2);
1503         mutex_lock(&__ip_vs_mutex);
1504         for (idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
1505                 hlist_for_each_entry(svc, &ip_vs_svc_table[idx], s_list) {
1506                         if (net_eq(svc->net, net)) {
1507                                 list_for_each_entry(dest, &svc->destinations,
1508                                                     n_list) {
1509                                         ip_vs_forget_dev(dest, dev);
1510                                 }
1511                         }
1512                 }
1513 
1514                 hlist_for_each_entry(svc, &ip_vs_svc_fwm_table[idx], f_list) {
1515                         if (net_eq(svc->net, net)) {
1516                                 list_for_each_entry(dest, &svc->destinations,
1517                                                     n_list) {
1518                                         ip_vs_forget_dev(dest, dev);
1519                                 }
1520                         }
1521 
1522                 }
1523         }
1524 
1525         spin_lock_bh(&ipvs->dest_trash_lock);
1526         list_for_each_entry(dest, &ipvs->dest_trash, t_list) {
1527                 ip_vs_forget_dev(dest, dev);
1528         }
1529         spin_unlock_bh(&ipvs->dest_trash_lock);
1530         mutex_unlock(&__ip_vs_mutex);
1531         LeaveFunction(2);
1532         return NOTIFY_DONE;
1533 }
1534 
1535 /*
1536  *      Zero counters in a service or all services
1537  */
1538 static int ip_vs_zero_service(struct ip_vs_service *svc)
1539 {
1540         struct ip_vs_dest *dest;
1541 
1542         list_for_each_entry(dest, &svc->destinations, n_list) {
1543                 ip_vs_zero_stats(&dest->stats);
1544         }
1545         ip_vs_zero_stats(&svc->stats);
1546         return 0;
1547 }
1548 
1549 static int ip_vs_zero_all(struct net *net)
1550 {
1551         int idx;
1552         struct ip_vs_service *svc;
1553 
1554         for(idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
1555                 hlist_for_each_entry(svc, &ip_vs_svc_table[idx], s_list) {
1556                         if (net_eq(svc->net, net))
1557                                 ip_vs_zero_service(svc);
1558                 }
1559         }
1560 
1561         for(idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
1562                 hlist_for_each_entry(svc, &ip_vs_svc_fwm_table[idx], f_list) {
1563                         if (net_eq(svc->net, net))
1564                                 ip_vs_zero_service(svc);
1565                 }
1566         }
1567 
1568         ip_vs_zero_stats(&net_ipvs(net)->tot_stats);
1569         return 0;
1570 }
1571 
1572 #ifdef CONFIG_SYSCTL
1573 
1574 static int zero;
1575 static int three = 3;
1576 
1577 static int
1578 proc_do_defense_mode(ctl_table *table, int write,
1579                      void __user *buffer, size_t *lenp, loff_t *ppos)
1580 {
1581         struct net *net = current->nsproxy->net_ns;
1582         int *valp = table->data;
1583         int val = *valp;
1584         int rc;
1585 
1586         rc = proc_dointvec(table, write, buffer, lenp, ppos);
1587         if (write && (*valp != val)) {
1588                 if ((*valp < 0) || (*valp > 3)) {
1589                         /* Restore the correct value */
1590                         *valp = val;
1591                 } else {
1592                         update_defense_level(net_ipvs(net));
1593                 }
1594         }
1595         return rc;
1596 }
1597 
1598 static int
1599 proc_do_sync_threshold(ctl_table *table, int write,
1600                        void __user *buffer, size_t *lenp, loff_t *ppos)
1601 {
1602         int *valp = table->data;
1603         int val[2];
1604         int rc;
1605 
1606         /* backup the value first */
1607         memcpy(val, valp, sizeof(val));
1608 
1609         rc = proc_dointvec(table, write, buffer, lenp, ppos);
1610         if (write && (valp[0] < 0 || valp[1] < 0 ||
1611             (valp[0] >= valp[1] && valp[1]))) {
1612                 /* Restore the correct value */
1613                 memcpy(valp, val, sizeof(val));
1614         }
1615         return rc;
1616 }
1617 
1618 static int
1619 proc_do_sync_mode(ctl_table *table, int write,
1620                      void __user *buffer, size_t *lenp, loff_t *ppos)
1621 {
1622         int *valp = table->data;
1623         int val = *valp;
1624         int rc;
1625 
1626         rc = proc_dointvec(table, write, buffer, lenp, ppos);
1627         if (write && (*valp != val)) {
1628                 if ((*valp < 0) || (*valp > 1)) {
1629                         /* Restore the correct value */
1630                         *valp = val;
1631                 }
1632         }
1633         return rc;
1634 }
1635 
1636 static int
1637 proc_do_sync_ports(ctl_table *table, int write,
1638                    void __user *buffer, size_t *lenp, loff_t *ppos)
1639 {
1640         int *valp = table->data;
1641         int val = *valp;
1642         int rc;
1643 
1644         rc = proc_dointvec(table, write, buffer, lenp, ppos);
1645         if (write && (*valp != val)) {
1646                 if (*valp < 1 || !is_power_of_2(*valp)) {
1647                         /* Restore the correct value */
1648                         *valp = val;
1649                 }
1650         }
1651         return rc;
1652 }
1653 
1654 /*
1655  *      IPVS sysctl table (under the /proc/sys/net/ipv4/vs/)
1656  *      Do not change order or insert new entries without
1657  *      align with netns init in ip_vs_control_net_init()
1658  */
1659 
1660 static struct ctl_table vs_vars[] = {
1661         {
1662                 .procname       = "amemthresh",
1663                 .maxlen         = sizeof(int),
1664                 .mode           = 0644,
1665                 .proc_handler   = proc_dointvec,
1666         },
1667         {
1668                 .procname       = "am_droprate",
1669                 .maxlen         = sizeof(int),
1670                 .mode           = 0644,
1671                 .proc_handler   = proc_dointvec,
1672         },
1673         {
1674                 .procname       = "drop_entry",
1675                 .maxlen         = sizeof(int),
1676                 .mode           = 0644,
1677                 .proc_handler   = proc_do_defense_mode,
1678         },
1679         {
1680                 .procname       = "drop_packet",
1681                 .maxlen         = sizeof(int),
1682                 .mode           = 0644,
1683                 .proc_handler   = proc_do_defense_mode,
1684         },
1685 #ifdef CONFIG_IP_VS_NFCT
1686         {
1687                 .procname       = "conntrack",
1688                 .maxlen         = sizeof(int),
1689                 .mode           = 0644,
1690                 .proc_handler   = &proc_dointvec,
1691         },
1692 #endif
1693         {
1694                 .procname       = "secure_tcp",
1695                 .maxlen         = sizeof(int),
1696                 .mode           = 0644,
1697                 .proc_handler   = proc_do_defense_mode,
1698         },
1699         {
1700                 .procname       = "snat_reroute",
1701                 .maxlen         = sizeof(int),
1702                 .mode           = 0644,
1703                 .proc_handler   = &proc_dointvec,
1704         },
1705         {
1706                 .procname       = "sync_version",
1707                 .maxlen         = sizeof(int),
1708                 .mode           = 0644,
1709                 .proc_handler   = &proc_do_sync_mode,
1710         },
1711         {
1712                 .procname       = "sync_ports",
1713                 .maxlen         = sizeof(int),
1714                 .mode           = 0644,
1715                 .proc_handler   = &proc_do_sync_ports,
1716         },
1717         {
1718                 .procname       = "sync_qlen_max",
1719                 .maxlen         = sizeof(int),
1720                 .mode           = 0644,
1721                 .proc_handler   = proc_dointvec,
1722         },
1723         {
1724                 .procname       = "sync_sock_size",
1725                 .maxlen         = sizeof(int),
1726                 .mode           = 0644,
1727                 .proc_handler   = proc_dointvec,
1728         },
1729         {
1730                 .procname       = "cache_bypass",
1731                 .maxlen         = sizeof(int),
1732                 .mode           = 0644,
1733                 .proc_handler   = proc_dointvec,
1734         },
1735         {
1736                 .procname       = "expire_nodest_conn",
1737                 .maxlen         = sizeof(int),
1738                 .mode           = 0644,
1739                 .proc_handler   = proc_dointvec,
1740         },
1741         {
1742                 .procname       = "expire_quiescent_template",
1743                 .maxlen         = sizeof(int),
1744                 .mode           = 0644,
1745                 .proc_handler   = proc_dointvec,
1746         },
1747         {
1748                 .procname       = "sync_threshold",
1749                 .maxlen         =
1750                         sizeof(((struct netns_ipvs *)0)->sysctl_sync_threshold),
1751                 .mode           = 0644,
1752                 .proc_handler   = proc_do_sync_threshold,
1753         },
1754         {
1755                 .procname       = "sync_refresh_period",
1756                 .maxlen         = sizeof(int),
1757                 .mode           = 0644,
1758                 .proc_handler   = proc_dointvec_jiffies,
1759         },
1760         {
1761                 .procname       = "sync_retries",
1762                 .maxlen         = sizeof(int),
1763                 .mode           = 0644,
1764                 .proc_handler   = proc_dointvec_minmax,
1765                 .extra1         = &zero,
1766                 .extra2         = &three,
1767         },
1768         {
1769                 .procname       = "nat_icmp_send",
1770                 .maxlen         = sizeof(int),
1771                 .mode           = 0644,
1772                 .proc_handler   = proc_dointvec,
1773         },
1774         {
1775                 .procname       = "pmtu_disc",
1776                 .maxlen         = sizeof(int),
1777                 .mode           = 0644,
1778                 .proc_handler   = proc_dointvec,
1779         },
1780         {
1781                 .procname       = "backup_only",
1782                 .maxlen         = sizeof(int),
1783                 .mode           = 0644,
1784                 .proc_handler   = proc_dointvec,
1785         },
1786 #ifdef CONFIG_IP_VS_DEBUG
1787         {
1788                 .procname       = "debug_level",
1789                 .data           = &sysctl_ip_vs_debug_level,
1790                 .maxlen         = sizeof(int),
1791                 .mode           = 0644,
1792                 .proc_handler   = proc_dointvec,
1793         },
1794 #endif
1795 #if 0
1796         {
1797                 .procname       = "timeout_established",
1798                 .data   = &vs_timeout_table_dos.timeout[IP_VS_S_ESTABLISHED],
1799                 .maxlen         = sizeof(int),
1800                 .mode           = 0644,
1801                 .proc_handler   = proc_dointvec_jiffies,
1802         },
1803         {
1804                 .procname       = "timeout_synsent",
1805                 .data   = &vs_timeout_table_dos.timeout[IP_VS_S_SYN_SENT],
1806                 .maxlen         = sizeof(int),
1807                 .mode           = 0644,
1808                 .proc_handler   = proc_dointvec_jiffies,
1809         },
1810         {
1811                 .procname       = "timeout_synrecv",
1812                 .data   = &vs_timeout_table_dos.timeout[IP_VS_S_SYN_RECV],
1813                 .maxlen         = sizeof(int),
1814                 .mode           = 0644,
1815                 .proc_handler   = proc_dointvec_jiffies,
1816         },
1817         {
1818                 .procname       = "timeout_finwait",
1819                 .data   = &vs_timeout_table_dos.timeout[IP_VS_S_FIN_WAIT],
1820                 .maxlen         = sizeof(int),
1821                 .mode           = 0644,
1822                 .proc_handler   = proc_dointvec_jiffies,
1823         },
1824         {
1825                 .procname       = "timeout_timewait",
1826                 .data   = &vs_timeout_table_dos.timeout[IP_VS_S_TIME_WAIT],
1827                 .maxlen         = sizeof(int),
1828                 .mode           = 0644,
1829                 .proc_handler   = proc_dointvec_jiffies,
1830         },
1831         {
1832                 .procname       = "timeout_close",
1833                 .data   = &vs_timeout_table_dos.timeout[IP_VS_S_CLOSE],
1834                 .maxlen         = sizeof(int),
1835                 .mode           = 0644,
1836                 .proc_handler   = proc_dointvec_jiffies,
1837         },
1838         {
1839                 .procname       = "timeout_closewait",
1840                 .data   = &vs_timeout_table_dos.timeout[IP_VS_S_CLOSE_WAIT],
1841                 .maxlen         = sizeof(int),
1842                 .mode           = 0644,
1843                 .proc_handler   = proc_dointvec_jiffies,
1844         },
1845         {
1846                 .procname       = "timeout_lastack",
1847                 .data   = &vs_timeout_table_dos.timeout[IP_VS_S_LAST_ACK],
1848                 .maxlen         = sizeof(int),
1849                 .mode           = 0644,
1850                 .proc_handler   = proc_dointvec_jiffies,
1851         },
1852         {
1853                 .procname       = "timeout_listen",
1854                 .data   = &vs_timeout_table_dos.timeout[IP_VS_S_LISTEN],
1855                 .maxlen         = sizeof(int),
1856                 .mode           = 0644,
1857                 .proc_handler   = proc_dointvec_jiffies,
1858         },
1859         {
1860                 .procname       = "timeout_synack",
1861                 .data   = &vs_timeout_table_dos.timeout[IP_VS_S_SYNACK],
1862                 .maxlen         = sizeof(int),
1863                 .mode           = 0644,
1864                 .proc_handler   = proc_dointvec_jiffies,
1865         },
1866         {
1867                 .procname       = "timeout_udp",
1868                 .data   = &vs_timeout_table_dos.timeout[IP_VS_S_UDP],
1869                 .maxlen         = sizeof(int),
1870                 .mode           = 0644,
1871                 .proc_handler   = proc_dointvec_jiffies,
1872         },
1873         {
1874                 .procname       = "timeout_icmp",
1875                 .data   = &vs_timeout_table_dos.timeout[IP_VS_S_ICMP],
1876                 .maxlen         = sizeof(int),
1877                 .mode           = 0644,
1878                 .proc_handler   = proc_dointvec_jiffies,
1879         },
1880 #endif
1881         { }
1882 };
1883 
1884 #endif
1885 
1886 #ifdef CONFIG_PROC_FS
1887 
1888 struct ip_vs_iter {
1889         struct seq_net_private p;  /* Do not move this, netns depends upon it*/
1890         struct hlist_head *table;
1891         int bucket;
1892 };
1893 
1894 /*
1895  *      Write the contents of the VS rule table to a PROCfs file.
1896  *      (It is kept just for backward compatibility)
1897  */
1898 static inline const char *ip_vs_fwd_name(unsigned int flags)
1899 {
1900         switch (flags & IP_VS_CONN_F_FWD_MASK) {
1901         case IP_VS_CONN_F_LOCALNODE:
1902                 return "Local";
1903         case IP_VS_CONN_F_TUNNEL:
1904                 return "Tunnel";
1905         case IP_VS_CONN_F_DROUTE:
1906                 return "Route";
1907         default:
1908                 return "Masq";
1909         }
1910 }
1911 
1912 
1913 /* Get the Nth entry in the two lists */
1914 static struct ip_vs_service *ip_vs_info_array(struct seq_file *seq, loff_t pos)
1915 {
1916         struct net *net = seq_file_net(seq);
1917         struct ip_vs_iter *iter = seq->private;
1918         int idx;
1919         struct ip_vs_service *svc;
1920 
1921         /* look in hash by protocol */
1922         for (idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
1923                 hlist_for_each_entry_rcu(svc, &ip_vs_svc_table[idx], s_list) {
1924                         if (net_eq(svc->net, net) && pos-- == 0) {
1925                                 iter->table = ip_vs_svc_table;
1926                                 iter->bucket = idx;
1927                                 return svc;
1928                         }
1929                 }
1930         }
1931 
1932         /* keep looking in fwmark */
1933         for (idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
1934                 hlist_for_each_entry_rcu(svc, &ip_vs_svc_fwm_table[idx],
1935                                          f_list) {
1936                         if (net_eq(svc->net, net) && pos-- == 0) {
1937                                 iter->table = ip_vs_svc_fwm_table;
1938                                 iter->bucket = idx;
1939                                 return svc;
1940                         }
1941                 }
1942         }
1943 
1944         return NULL;
1945 }
1946 
1947 static void *ip_vs_info_seq_start(struct seq_file *seq, loff_t *pos)
1948         __acquires(RCU)
1949 {
1950         rcu_read_lock();
1951         return *pos ? ip_vs_info_array(seq, *pos - 1) : SEQ_START_TOKEN;
1952 }
1953 
1954 
1955 static void *ip_vs_info_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1956 {
1957         struct hlist_node *e;
1958         struct ip_vs_iter *iter;
1959         struct ip_vs_service *svc;
1960 
1961         ++*pos;
1962         if (v == SEQ_START_TOKEN)
1963                 return ip_vs_info_array(seq,0);
1964 
1965         svc = v;
1966         iter = seq->private;
1967 
1968         if (iter->table == ip_vs_svc_table) {
1969                 /* next service in table hashed by protocol */
1970                 e = rcu_dereference(hlist_next_rcu(&svc->s_list));
1971                 if (e)
1972                         return hlist_entry(e, struct ip_vs_service, s_list);
1973 
1974                 while (++iter->bucket < IP_VS_SVC_TAB_SIZE) {
1975                         hlist_for_each_entry_rcu(svc,
1976                                                  &ip_vs_svc_table[iter->bucket],
1977                                                  s_list) {
1978                                 return svc;
1979                         }
1980                 }
1981 
1982                 iter->table = ip_vs_svc_fwm_table;
1983                 iter->bucket = -1;
1984                 goto scan_fwmark;
1985         }
1986 
1987         /* next service in hashed by fwmark */
1988         e = rcu_dereference(hlist_next_rcu(&svc->f_list));
1989         if (e)
1990                 return hlist_entry(e, struct ip_vs_service, f_list);
1991 
1992  scan_fwmark:
1993         while (++iter->bucket < IP_VS_SVC_TAB_SIZE) {
1994                 hlist_for_each_entry_rcu(svc,
1995                                          &ip_vs_svc_fwm_table[iter->bucket],
1996                                          f_list)
1997                         return svc;
1998         }
1999 
2000         return NULL;
2001 }
2002 
2003 static void ip_vs_info_seq_stop(struct seq_file *seq, void *v)
2004         __releases(RCU)
2005 {
2006         rcu_read_unlock();
2007 }
2008 
2009 
2010 static int ip_vs_info_seq_show(struct seq_file *seq, void *v)
2011 {
2012         if (v == SEQ_START_TOKEN) {
2013                 seq_printf(seq,
2014                         "IP Virtual Server version %d.%d.%d (size=%d)\n",
2015                         NVERSION(IP_VS_VERSION_CODE), ip_vs_conn_tab_size);
2016                 seq_puts(seq,
2017                          "Prot LocalAddress:Port Scheduler Flags\n");
2018                 seq_puts(seq,
2019                          "  -> RemoteAddress:Port Forward Weight ActiveConn InActConn\n");
2020         } else {
2021                 const struct ip_vs_service *svc = v;
2022                 const struct ip_vs_iter *iter = seq->private;
2023                 const struct ip_vs_dest *dest;
2024                 struct ip_vs_scheduler *sched = rcu_dereference(svc->scheduler);
2025 
2026                 if (iter->table == ip_vs_svc_table) {
2027 #ifdef CONFIG_IP_VS_IPV6
2028                         if (svc->af == AF_INET6)
2029                                 seq_printf(seq, "%s  [%pI6]:%04X %s ",
2030                                            ip_vs_proto_name(svc->protocol),
2031                                            &svc->addr.in6,
2032                                            ntohs(svc->port),
2033                                            sched->name);
2034                         else
2035 #endif
2036                                 seq_printf(seq, "%s  %08X:%04X %s %s ",
2037                                            ip_vs_proto_name(svc->protocol),
2038                                            ntohl(svc->addr.ip),
2039                                            ntohs(svc->port),
2040                                            sched->name,
2041                                            (svc->flags & IP_VS_SVC_F_ONEPACKET)?"ops ":"");
2042                 } else {
2043                         seq_printf(seq, "FWM  %08X %s %s",
2044                                    svc->fwmark, sched->name,
2045                                    (svc->flags & IP_VS_SVC_F_ONEPACKET)?"ops ":"");
2046                 }
2047 
2048                 if (svc->flags & IP_VS_SVC_F_PERSISTENT)
2049                         seq_printf(seq, "persistent %d %08X\n",
2050                                 svc->timeout,
2051                                 ntohl(svc->netmask));
2052                 else
2053                         seq_putc(seq, '\n');
2054 
2055                 list_for_each_entry_rcu(dest, &svc->destinations, n_list) {
2056 #ifdef CONFIG_IP_VS_IPV6
2057                         if (dest->af == AF_INET6)
2058                                 seq_printf(seq,
2059                                            "  -> [%pI6]:%04X"
2060                                            "      %-7s %-6d %-10d %-10d\n",
2061                                            &dest->addr.in6,
2062                                            ntohs(dest->port),
2063                                            ip_vs_fwd_name(atomic_read(&dest->conn_flags)),
2064                                            atomic_read(&dest->weight),
2065                                            atomic_read(&dest->activeconns),
2066                                            atomic_read(&dest->inactconns));
2067                         else
2068 #endif
2069                                 seq_printf(seq,
2070                                            "  -> %08X:%04X      "
2071                                            "%-7s %-6d %-10d %-10d\n",
2072                                            ntohl(dest->addr.ip),
2073                                            ntohs(dest->port),
2074                                            ip_vs_fwd_name(atomic_read(&dest->conn_flags)),
2075                                            atomic_read(&dest->weight),
2076                                            atomic_read(&dest->activeconns),
2077                                            atomic_read(&dest->inactconns));
2078 
2079                 }
2080         }
2081         return 0;
2082 }
2083 
2084 static const struct seq_operations ip_vs_info_seq_ops = {
2085         .start = ip_vs_info_seq_start,
2086         .next  = ip_vs_info_seq_next,
2087         .stop  = ip_vs_info_seq_stop,
2088         .show  = ip_vs_info_seq_show,
2089 };
2090 
2091 static int ip_vs_info_open(struct inode *inode, struct file *file)
2092 {
2093         return seq_open_net(inode, file, &ip_vs_info_seq_ops,
2094                         sizeof(struct ip_vs_iter));
2095 }
2096 
2097 static const struct file_operations ip_vs_info_fops = {
2098         .owner   = THIS_MODULE,
2099         .open    = ip_vs_info_open,
2100         .read    = seq_read,
2101         .llseek  = seq_lseek,
2102         .release = seq_release_net,
2103 };
2104 
2105 static int ip_vs_stats_show(struct seq_file *seq, void *v)
2106 {
2107         struct net *net = seq_file_single_net(seq);
2108         struct ip_vs_stats_user show;
2109 
2110 /*               01234567 01234567 01234567 0123456701234567 0123456701234567 */
2111         seq_puts(seq,
2112                  "   Total Incoming Outgoing         Incoming         Outgoing\n");
2113         seq_printf(seq,
2114                    "   Conns  Packets  Packets            Bytes            Bytes\n");
2115 
2116         ip_vs_copy_stats(&show, &net_ipvs(net)->tot_stats);
2117         seq_printf(seq, "%8X %8X %8X %16LX %16LX\n\n", show.conns,
2118                    show.inpkts, show.outpkts,
2119                    (unsigned long long) show.inbytes,
2120                    (unsigned long long) show.outbytes);
2121 
2122 /*                 01234567 01234567 01234567 0123456701234567 0123456701234567 */
2123         seq_puts(seq,
2124                    " Conns/s   Pkts/s   Pkts/s          Bytes/s          Bytes/s\n");
2125         seq_printf(seq, "%8X %8X %8X %16X %16X\n",
2126                         show.cps, show.inpps, show.outpps,
2127                         show.inbps, show.outbps);
2128 
2129         return 0;
2130 }
2131 
2132 static int ip_vs_stats_seq_open(struct inode *inode, struct file *file)
2133 {
2134         return single_open_net(inode, file, ip_vs_stats_show);
2135 }
2136 
2137 static const struct file_operations ip_vs_stats_fops = {
2138         .owner = THIS_MODULE,
2139         .open = ip_vs_stats_seq_open,
2140         .read = seq_read,
2141         .llseek = seq_lseek,
2142         .release = single_release_net,
2143 };
2144 
2145 static int ip_vs_stats_percpu_show(struct seq_file *seq, void *v)
2146 {
2147         struct net *net = seq_file_single_net(seq);
2148         struct ip_vs_stats *tot_stats = &net_ipvs(net)->tot_stats;
2149         struct ip_vs_cpu_stats __percpu *cpustats = tot_stats->cpustats;
2150         struct ip_vs_stats_user rates;
2151         int i;
2152 
2153 /*               01234567 01234567 01234567 0123456701234567 0123456701234567 */
2154         seq_puts(seq,
2155                  "       Total Incoming Outgoing         Incoming         Outgoing\n");
2156         seq_printf(seq,
2157                    "CPU    Conns  Packets  Packets            Bytes            Bytes\n");
2158 
2159         for_each_possible_cpu(i) {
2160                 struct ip_vs_cpu_stats *u = per_cpu_ptr(cpustats, i);
2161                 unsigned int start;
2162                 __u64 inbytes, outbytes;
2163 
2164                 do {
2165                         start = u64_stats_fetch_begin_bh(&u->syncp);
2166                         inbytes = u->ustats.inbytes;
2167                         outbytes = u->ustats.outbytes;
2168                 } while (u64_stats_fetch_retry_bh(&u->syncp, start));
2169 
2170                 seq_printf(seq, "%3X %8X %8X %8X %16LX %16LX\n",
2171                            i, u->ustats.conns, u->ustats.inpkts,
2172                            u->ustats.outpkts, (__u64)inbytes,
2173                            (__u64)outbytes);
2174         }
2175 
2176         spin_lock_bh(&tot_stats->lock);
2177 
2178         seq_printf(seq, "  ~ %8X %8X %8X %16LX %16LX\n\n",
2179                    tot_stats->ustats.conns, tot_stats->ustats.inpkts,
2180                    tot_stats->ustats.outpkts,
2181                    (unsigned long long) tot_stats->ustats.inbytes,
2182                    (unsigned long long) tot_stats->ustats.outbytes);
2183 
2184         ip_vs_read_estimator(&rates, tot_stats);
2185 
2186         spin_unlock_bh(&tot_stats->lock);
2187 
2188 /*                 01234567 01234567 01234567 0123456701234567 0123456701234567 */
2189         seq_puts(seq,
2190                    "     Conns/s   Pkts/s   Pkts/s          Bytes/s          Bytes/s\n");
2191         seq_printf(seq, "    %8X %8X %8X %16X %16X\n",
2192                         rates.cps,
2193                         rates.inpps,
2194                         rates.outpps,
2195                         rates.inbps,
2196                         rates.outbps);
2197 
2198         return 0;
2199 }
2200 
2201 static int ip_vs_stats_percpu_seq_open(struct inode *inode, struct file *file)
2202 {
2203         return single_open_net(inode, file, ip_vs_stats_percpu_show);
2204 }
2205 
2206 static const struct file_operations ip_vs_stats_percpu_fops = {
2207         .owner = THIS_MODULE,
2208         .open = ip_vs_stats_percpu_seq_open,
2209         .read = seq_read,
2210         .llseek = seq_lseek,
2211         .release = single_release_net,
2212 };
2213 #endif
2214 
2215 /*
2216  *      Set timeout values for tcp tcpfin udp in the timeout_table.
2217  */
2218 static int ip_vs_set_timeout(struct net *net, struct ip_vs_timeout_user *u)
2219 {
2220 #if defined(CONFIG_IP_VS_PROTO_TCP) || defined(CONFIG_IP_VS_PROTO_UDP)
2221         struct ip_vs_proto_data *pd;
2222 #endif
2223 
2224         IP_VS_DBG(2, "Setting timeout tcp:%d tcpfin:%d udp:%d\n",
2225                   u->tcp_timeout,
2226                   u->tcp_fin_timeout,
2227                   u->udp_timeout);
2228 
2229 #ifdef CONFIG_IP_VS_PROTO_TCP
2230         if (u->tcp_timeout) {
2231                 pd = ip_vs_proto_data_get(net, IPPROTO_TCP);
2232                 pd->timeout_table[IP_VS_TCP_S_ESTABLISHED]
2233                         = u->tcp_timeout * HZ;
2234         }
2235 
2236         if (u->tcp_fin_timeout) {
2237                 pd = ip_vs_proto_data_get(net, IPPROTO_TCP);
2238                 pd->timeout_table[IP_VS_TCP_S_FIN_WAIT]
2239                         = u->tcp_fin_timeout * HZ;
2240         }
2241 #endif
2242 
2243 #ifdef CONFIG_IP_VS_PROTO_UDP
2244         if (u->udp_timeout) {
2245                 pd = ip_vs_proto_data_get(net, IPPROTO_UDP);
2246                 pd->timeout_table[IP_VS_UDP_S_NORMAL]
2247                         = u->udp_timeout * HZ;
2248         }
2249 #endif
2250         return 0;
2251 }
2252 
2253 
2254 #define SET_CMDID(cmd)          (cmd - IP_VS_BASE_CTL)
2255 #define SERVICE_ARG_LEN         (sizeof(struct ip_vs_service_user))
2256 #define SVCDEST_ARG_LEN         (sizeof(struct ip_vs_service_user) +    \
2257                                  sizeof(struct ip_vs_dest_user))
2258 #define TIMEOUT_ARG_LEN         (sizeof(struct ip_vs_timeout_user))
2259 #define DAEMON_ARG_LEN          (sizeof(struct ip_vs_daemon_user))
2260 #define MAX_ARG_LEN             SVCDEST_ARG_LEN
2261 
2262 static const unsigned char set_arglen[SET_CMDID(IP_VS_SO_SET_MAX)+1] = {
2263         [SET_CMDID(IP_VS_SO_SET_ADD)]           = SERVICE_ARG_LEN,
2264         [SET_CMDID(IP_VS_SO_SET_EDIT)]          = SERVICE_ARG_LEN,
2265         [SET_CMDID(IP_VS_SO_SET_DEL)]           = SERVICE_ARG_LEN,
2266         [SET_CMDID(IP_VS_SO_SET_FLUSH)]         = 0,
2267         [SET_CMDID(IP_VS_SO_SET_ADDDEST)]       = SVCDEST_ARG_LEN,
2268         [SET_CMDID(IP_VS_SO_SET_DELDEST)]       = SVCDEST_ARG_LEN,
2269         [SET_CMDID(IP_VS_SO_SET_EDITDEST)]      = SVCDEST_ARG_LEN,
2270         [SET_CMDID(IP_VS_SO_SET_TIMEOUT)]       = TIMEOUT_ARG_LEN,
2271         [SET_CMDID(IP_VS_SO_SET_STARTDAEMON)]   = DAEMON_ARG_LEN,
2272         [SET_CMDID(IP_VS_SO_SET_STOPDAEMON)]    = DAEMON_ARG_LEN,
2273         [SET_CMDID(IP_VS_SO_SET_ZERO)]          = SERVICE_ARG_LEN,
2274 };
2275 
2276 static void ip_vs_copy_usvc_compat(struct ip_vs_service_user_kern *usvc,
2277                                   struct ip_vs_service_user *usvc_compat)
2278 {
2279         memset(usvc, 0, sizeof(*usvc));
2280 
2281         usvc->af                = AF_INET;
2282         usvc->protocol          = usvc_compat->protocol;
2283         usvc->addr.ip           = usvc_compat->addr;
2284         usvc->port              = usvc_compat->port;
2285         usvc->fwmark            = usvc_compat->fwmark;
2286 
2287         /* Deep copy of sched_name is not needed here */
2288         usvc->sched_name        = usvc_compat->sched_name;
2289 
2290         usvc->flags             = usvc_compat->flags;
2291         usvc->timeout           = usvc_compat->timeout;
2292         usvc->netmask           = usvc_compat->netmask;
2293 }
2294 
2295 static void ip_vs_copy_udest_compat(struct ip_vs_dest_user_kern *udest,
2296                                    struct ip_vs_dest_user *udest_compat)
2297 {
2298         memset(udest, 0, sizeof(*udest));
2299 
2300         udest->addr.ip          = udest_compat->addr;
2301         udest->port             = udest_compat->port;
2302         udest->conn_flags       = udest_compat->conn_flags;
2303         udest->weight           = udest_compat->weight;
2304         udest->u_threshold      = udest_compat->u_threshold;
2305         udest->l_threshold      = udest_compat->l_threshold;
2306 }
2307 
2308 static int
2309 do_ip_vs_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len)
2310 {
2311         struct net *net = sock_net(sk);
2312         int ret;
2313         unsigned char arg[MAX_ARG_LEN];
2314         struct ip_vs_service_user *usvc_compat;
2315         struct ip_vs_service_user_kern usvc;
2316         struct ip_vs_service *svc;
2317         struct ip_vs_dest_user *udest_compat;
2318         struct ip_vs_dest_user_kern udest;
2319         struct netns_ipvs *ipvs = net_ipvs(net);
2320 
2321         if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
2322                 return -EPERM;
2323 
2324         if (cmd < IP_VS_BASE_CTL || cmd > IP_VS_SO_SET_MAX)
2325                 return -EINVAL;
2326         if (len < 0 || len >  MAX_ARG_LEN)
2327                 return -EINVAL;
2328         if (len != set_arglen[SET_CMDID(cmd)]) {
2329                 pr_err("set_ctl: len %u != %u\n",
2330                        len, set_arglen[SET_CMDID(cmd)]);
2331                 return -EINVAL;
2332         }
2333 
2334         if (copy_from_user(arg, user, len) != 0)
2335                 return -EFAULT;
2336 
2337         /* increase the module use count */
2338         ip_vs_use_count_inc();
2339 
2340         /* Handle daemons since they have another lock */
2341         if (cmd == IP_VS_SO_SET_STARTDAEMON ||
2342             cmd == IP_VS_SO_SET_STOPDAEMON) {
2343                 struct ip_vs_daemon_user *dm = (struct ip_vs_daemon_user *)arg;
2344 
2345                 if (mutex_lock_interruptible(&ipvs->sync_mutex)) {
2346                         ret = -ERESTARTSYS;
2347                         goto out_dec;
2348                 }
2349                 if (cmd == IP_VS_SO_SET_STARTDAEMON)
2350                         ret = start_sync_thread(net, dm->state, dm->mcast_ifn,
2351                                                 dm->syncid);
2352                 else
2353                         ret = stop_sync_thread(net, dm->state);
2354                 mutex_unlock(&ipvs->sync_mutex);
2355                 goto out_dec;
2356         }
2357 
2358         if (mutex_lock_interruptible(&__ip_vs_mutex)) {
2359                 ret = -ERESTARTSYS;
2360                 goto out_dec;
2361         }
2362 
2363         if (cmd == IP_VS_SO_SET_FLUSH) {
2364                 /* Flush the virtual service */
2365                 ret = ip_vs_flush(net, false);
2366                 goto out_unlock;
2367         } else if (cmd == IP_VS_SO_SET_TIMEOUT) {
2368                 /* Set timeout values for (tcp tcpfin udp) */
2369                 ret = ip_vs_set_timeout(net, (struct ip_vs_timeout_user *)arg);
2370                 goto out_unlock;
2371         }
2372 
2373         usvc_compat = (struct ip_vs_service_user *)arg;
2374         udest_compat = (struct ip_vs_dest_user *)(usvc_compat + 1);
2375 
2376         /* We only use the new structs internally, so copy userspace compat
2377          * structs to extended internal versions */
2378         ip_vs_copy_usvc_compat(&usvc, usvc_compat);
2379         ip_vs_copy_udest_compat(&udest, udest_compat);
2380 
2381         if (cmd == IP_VS_SO_SET_ZERO) {
2382                 /* if no service address is set, zero counters in all */
2383                 if (!usvc.fwmark && !usvc.addr.ip && !usvc.port) {
2384                         ret = ip_vs_zero_all(net);
2385                         goto out_unlock;
2386                 }
2387         }
2388 
2389         /* Check for valid protocol: TCP or UDP or SCTP, even for fwmark!=0 */
2390         if (usvc.protocol != IPPROTO_TCP && usvc.protocol != IPPROTO_UDP &&
2391             usvc.protocol != IPPROTO_SCTP) {
2392                 pr_err("set_ctl: invalid protocol: %d %pI4:%d %s\n",
2393                        usvc.protocol, &usvc.addr.ip,
2394                        ntohs(usvc.port), usvc.sched_name);
2395                 ret = -EFAULT;
2396                 goto out_unlock;
2397         }
2398 
2399         /* Lookup the exact service by <protocol, addr, port> or fwmark */
2400         rcu_read_lock();
2401         if (usvc.fwmark == 0)
2402                 svc = __ip_vs_service_find(net, usvc.af, usvc.protocol,
2403                                            &usvc.addr, usvc.port);
2404         else
2405                 svc = __ip_vs_svc_fwm_find(net, usvc.af, usvc.fwmark);
2406         rcu_read_unlock();
2407 
2408         if (cmd != IP_VS_SO_SET_ADD
2409             && (svc == NULL || svc->protocol != usvc.protocol)) {
2410                 ret = -ESRCH;
2411                 goto out_unlock;
2412         }
2413 
2414         switch (cmd) {
2415         case IP_VS_SO_SET_ADD:
2416                 if (svc != NULL)
2417                         ret = -EEXIST;
2418                 else
2419                         ret = ip_vs_add_service(net, &usvc, &svc);
2420                 break;
2421         case IP_VS_SO_SET_EDIT:
2422                 ret = ip_vs_edit_service(svc, &usvc);
2423                 break;
2424         case IP_VS_SO_SET_DEL:
2425                 ret = ip_vs_del_service(svc);
2426                 if (!ret)
2427                         goto out_unlock;
2428                 break;
2429         case IP_VS_SO_SET_ZERO:
2430                 ret = ip_vs_zero_service(svc);
2431                 break;
2432         case IP_VS_SO_SET_ADDDEST:
2433                 ret = ip_vs_add_dest(svc, &udest);
2434                 break;
2435         case IP_VS_SO_SET_EDITDEST:
2436                 ret = ip_vs_edit_dest(svc, &udest);
2437                 break;
2438         case IP_VS_SO_SET_DELDEST:
2439                 ret = ip_vs_del_dest(svc, &udest);
2440                 break;
2441         default:
2442                 ret = -EINVAL;
2443         }
2444 
2445   out_unlock:
2446         mutex_unlock(&__ip_vs_mutex);
2447   out_dec:
2448         /* decrease the module use count */
2449         ip_vs_use_count_dec();
2450 
2451         return ret;
2452 }
2453 
2454 
2455 static void
2456 ip_vs_copy_service(struct ip_vs_service_entry *dst, struct ip_vs_service *src)
2457 {
2458         struct ip_vs_scheduler *sched;
2459 
2460         sched = rcu_dereference_protected(src->scheduler, 1);
2461         dst->protocol = src->protocol;
2462         dst->addr = src->addr.ip;
2463         dst->port = src->port;
2464         dst->fwmark = src->fwmark;
2465         strlcpy(dst->sched_name, sched->name, sizeof(dst->sched_name));
2466         dst->flags = src->flags;
2467         dst->timeout = src->timeout / HZ;
2468         dst->netmask = src->netmask;
2469         dst->num_dests = src->num_dests;
2470         ip_vs_copy_stats(&dst->stats, &src->stats);
2471 }
2472 
2473 static inline int
2474 __ip_vs_get_service_entries(struct net *net,
2475                             const struct ip_vs_get_services *get,
2476                             struct ip_vs_get_services __user *uptr)
2477 {
2478         int idx, count=0;
2479         struct ip_vs_service *svc;
2480         struct ip_vs_service_entry entry;
2481         int ret = 0;
2482 
2483         for (idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
2484                 hlist_for_each_entry(svc, &ip_vs_svc_table[idx], s_list) {
2485                         /* Only expose IPv4 entries to old interface */
2486                         if (svc->af != AF_INET || !net_eq(svc->net, net))
2487                                 continue;
2488 
2489                         if (count >= get->num_services)
2490                                 goto out;
2491                         memset(&entry, 0, sizeof(entry));
2492                         ip_vs_copy_service(&entry, svc);
2493                         if (copy_to_user(&uptr->entrytable[count],
2494                                          &entry, sizeof(entry))) {
2495                                 ret = -EFAULT;
2496                                 goto out;
2497                         }
2498                         count++;
2499                 }
2500         }
2501 
2502         for (idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
2503                 hlist_for_each_entry(svc, &ip_vs_svc_fwm_table[idx], f_list) {
2504                         /* Only expose IPv4 entries to old interface */
2505                         if (svc->af != AF_INET || !net_eq(svc->net, net))
2506                                 continue;
2507 
2508                         if (count >= get->num_services)
2509                                 goto out;
2510                         memset(&entry, 0, sizeof(entry));
2511                         ip_vs_copy_service(&entry, svc);
2512                         if (copy_to_user(&uptr->entrytable[count],
2513                                          &entry, sizeof(entry))) {
2514                                 ret = -EFAULT;
2515                                 goto out;
2516                         }
2517                         count++;
2518                 }
2519         }
2520 out:
2521         return ret;
2522 }
2523 
2524 static inline int
2525 __ip_vs_get_dest_entries(struct net *net, const struct ip_vs_get_dests *get,
2526                          struct ip_vs_get_dests __user *uptr)
2527 {
2528         struct ip_vs_service *svc;
2529         union nf_inet_addr addr = { .ip = get->addr };
2530         int ret = 0;
2531 
2532         rcu_read_lock();
2533         if (get->fwmark)
2534                 svc = __ip_vs_svc_fwm_find(net, AF_INET, get->fwmark);
2535         else
2536                 svc = __ip_vs_service_find(net, AF_INET, get->protocol, &addr,
2537                                            get->port);
2538         rcu_read_unlock();
2539 
2540         if (svc) {
2541                 int count = 0;
2542                 struct ip_vs_dest *dest;
2543                 struct ip_vs_dest_entry entry;
2544 
2545                 memset(&entry, 0, sizeof(entry));
2546                 list_for_each_entry(dest, &svc->destinations, n_list) {
2547                         if (count >= get->num_dests)
2548                                 break;
2549 
2550                         entry.addr = dest->addr.ip;
2551                         entry.port = dest->port;
2552                         entry.conn_flags = atomic_read(&dest->conn_flags);
2553                         entry.weight = atomic_read(&dest->weight);
2554                         entry.u_threshold = dest->u_threshold;
2555                         entry.l_threshold = dest->l_threshold;
2556                         entry.activeconns = atomic_read(&dest->activeconns);
2557                         entry.inactconns = atomic_read(&dest->inactconns);
2558                         entry.persistconns = atomic_read(&dest->persistconns);
2559                         ip_vs_copy_stats(&entry.stats, &dest->stats);
2560                         if (copy_to_user(&uptr->entrytable[count],
2561                                          &entry, sizeof(entry))) {
2562                                 ret = -EFAULT;
2563                                 break;
2564                         }
2565                         count++;
2566                 }
2567         } else
2568                 ret = -ESRCH;
2569         return ret;
2570 }
2571 
2572 static inline void
2573 __ip_vs_get_timeouts(struct net *net, struct ip_vs_timeout_user *u)
2574 {
2575 #if defined(CONFIG_IP_VS_PROTO_TCP) || defined(CONFIG_IP_VS_PROTO_UDP)
2576         struct ip_vs_proto_data *pd;
2577 #endif
2578 
2579         memset(u, 0, sizeof (*u));
2580 
2581 #ifdef CONFIG_IP_VS_PROTO_TCP
2582         pd = ip_vs_proto_data_get(net, IPPROTO_TCP);
2583         u->tcp_timeout = pd->timeout_table[IP_VS_TCP_S_ESTABLISHED] / HZ;
2584         u->tcp_fin_timeout = pd->timeout_table[IP_VS_TCP_S_FIN_WAIT] / HZ;
2585 #endif
2586 #ifdef CONFIG_IP_VS_PROTO_UDP
2587         pd = ip_vs_proto_data_get(net, IPPROTO_UDP);
2588         u->udp_timeout =
2589                         pd->timeout_table[IP_VS_UDP_S_NORMAL] / HZ;
2590 #endif
2591 }
2592 
2593 
2594 #define GET_CMDID(cmd)          (cmd - IP_VS_BASE_CTL)
2595 #define GET_INFO_ARG_LEN        (sizeof(struct ip_vs_getinfo))
2596 #define GET_SERVICES_ARG_LEN    (sizeof(struct ip_vs_get_services))
2597 #define GET_SERVICE_ARG_LEN     (sizeof(struct ip_vs_service_entry))
2598 #define GET_DESTS_ARG_LEN       (sizeof(struct ip_vs_get_dests))
2599 #define GET_TIMEOUT_ARG_LEN     (sizeof(struct ip_vs_timeout_user))
2600 #define GET_DAEMON_ARG_LEN      (sizeof(struct ip_vs_daemon_user) * 2)
2601 
2602 static const unsigned char get_arglen[GET_CMDID(IP_VS_SO_GET_MAX)+1] = {
2603         [GET_CMDID(IP_VS_SO_GET_VERSION)]       = 64,
2604         [GET_CMDID(IP_VS_SO_GET_INFO)]          = GET_INFO_ARG_LEN,
2605         [GET_CMDID(IP_VS_SO_GET_SERVICES)]      = GET_SERVICES_ARG_LEN,
2606         [GET_CMDID(IP_VS_SO_GET_SERVICE)]       = GET_SERVICE_ARG_LEN,
2607         [GET_CMDID(IP_VS_SO_GET_DESTS)]         = GET_DESTS_ARG_LEN,
2608         [GET_CMDID(IP_VS_SO_GET_TIMEOUT)]       = GET_TIMEOUT_ARG_LEN,
2609         [GET_CMDID(IP_VS_SO_GET_DAEMON)]        = GET_DAEMON_ARG_LEN,
2610 };
2611 
2612 static int
2613 do_ip_vs_get_ctl(struct sock *sk, int cmd, void __user *user, int *len)
2614 {
2615         unsigned char arg[128];
2616         int ret = 0;
2617         unsigned int copylen;
2618         struct net *net = sock_net(sk);
2619         struct netns_ipvs *ipvs = net_ipvs(net);
2620 
2621         BUG_ON(!net);
2622         if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
2623                 return -EPERM;
2624 
2625         if (cmd < IP_VS_BASE_CTL || cmd > IP_VS_SO_GET_MAX)
2626                 return -EINVAL;
2627 
2628         if (*len < get_arglen[GET_CMDID(cmd)]) {
2629                 pr_err("get_ctl: len %u < %u\n",
2630                        *len, get_arglen[GET_CMDID(cmd)]);
2631                 return -EINVAL;
2632         }
2633 
2634         copylen = get_arglen[GET_CMDID(cmd)];
2635         if (copylen > 128)
2636                 return -EINVAL;
2637 
2638         if (copy_from_user(arg, user, copylen) != 0)
2639                 return -EFAULT;
2640         /*
2641          * Handle daemons first since it has its own locking
2642          */
2643         if (cmd == IP_VS_SO_GET_DAEMON) {
2644                 struct ip_vs_daemon_user d[2];
2645 
2646                 memset(&d, 0, sizeof(d));
2647                 if (mutex_lock_interruptible(&ipvs->sync_mutex))
2648                         return -ERESTARTSYS;
2649 
2650                 if (ipvs->sync_state & IP_VS_STATE_MASTER) {
2651                         d[0].state = IP_VS_STATE_MASTER;
2652                         strlcpy(d[0].mcast_ifn, ipvs->master_mcast_ifn,
2653                                 sizeof(d[0].mcast_ifn));
2654                         d[0].syncid = ipvs->master_syncid;
2655                 }
2656                 if (ipvs->sync_state & IP_VS_STATE_BACKUP) {
2657                         d[1].state = IP_VS_STATE_BACKUP;
2658                         strlcpy(d[1].mcast_ifn, ipvs->backup_mcast_ifn,
2659                                 sizeof(d[1].mcast_ifn));
2660                         d[1].syncid = ipvs->backup_syncid;
2661                 }
2662                 if (copy_to_user(user, &d, sizeof(d)) != 0)
2663                         ret = -EFAULT;
2664                 mutex_unlock(&ipvs->sync_mutex);
2665                 return ret;
2666         }
2667 
2668         if (mutex_lock_interruptible(&__ip_vs_mutex))
2669                 return -ERESTARTSYS;
2670 
2671         switch (cmd) {
2672         case IP_VS_SO_GET_VERSION:
2673         {
2674                 char buf[64];
2675 
2676                 sprintf(buf, "IP Virtual Server version %d.%d.%d (size=%d)",
2677                         NVERSION(IP_VS_VERSION_CODE), ip_vs_conn_tab_size);
2678                 if (copy_to_user(user, buf, strlen(buf)+1) != 0) {
2679                         ret = -EFAULT;
2680                         goto out;
2681                 }
2682                 *len = strlen(buf)+1;
2683         }
2684         break;
2685 
2686         case IP_VS_SO_GET_INFO:
2687         {
2688                 struct ip_vs_getinfo info;
2689                 info.version = IP_VS_VERSION_CODE;
2690                 info.size = ip_vs_conn_tab_size;
2691                 info.num_services = ipvs->num_services;
2692                 if (copy_to_user(user, &info, sizeof(info)) != 0)
2693                         ret = -EFAULT;
2694         }
2695         break;
2696 
2697         case IP_VS_SO_GET_SERVICES:
2698         {
2699                 struct ip_vs_get_services *get;
2700                 int size;
2701 
2702                 get = (struct ip_vs_get_services *)arg;
2703                 size = sizeof(*get) +
2704                         sizeof(struct ip_vs_service_entry) * get->num_services;
2705                 if (*len != size) {
2706                         pr_err("length: %u != %u\n", *len, size);
2707                         ret = -EINVAL;
2708                         goto out;
2709                 }
2710                 ret = __ip_vs_get_service_entries(net, get, user);
2711         }
2712         break;
2713 
2714         case IP_VS_SO_GET_SERVICE:
2715         {
2716                 struct ip_vs_service_entry *entry;
2717                 struct ip_vs_service *svc;
2718                 union nf_inet_addr addr;
2719 
2720                 entry = (struct ip_vs_service_entry *)arg;
2721                 addr.ip = entry->addr;
2722                 rcu_read_lock();
2723                 if (entry->fwmark)
2724                         svc = __ip_vs_svc_fwm_find(net, AF_INET, entry->fwmark);
2725                 else
2726                         svc = __ip_vs_service_find(net, AF_INET,
2727                                                    entry->protocol, &addr,
2728                                                    entry->port);
2729                 rcu_read_unlock();
2730                 if (svc) {
2731                         ip_vs_copy_service(entry, svc);
2732                         if (copy_to_user(user, entry, sizeof(*entry)) != 0)
2733                                 ret = -EFAULT;
2734                 } else
2735                         ret = -ESRCH;
2736         }
2737         break;
2738 
2739         case IP_VS_SO_GET_DESTS:
2740         {
2741                 struct ip_vs_get_dests *get;
2742                 int size;
2743 
2744                 get = (struct ip_vs_get_dests *)arg;
2745                 size = sizeof(*get) +
2746                         sizeof(struct ip_vs_dest_entry) * get->num_dests;
2747                 if (*len != size) {
2748                         pr_err("length: %u != %u\n", *len, size);
2749                         ret = -EINVAL;
2750                         goto out;
2751                 }
2752                 ret = __ip_vs_get_dest_entries(net, get, user);
2753         }
2754         break;
2755 
2756         case IP_VS_SO_GET_TIMEOUT:
2757         {
2758                 struct ip_vs_timeout_user t;
2759 
2760                 __ip_vs_get_timeouts(net, &t);
2761                 if (copy_to_user(user, &t, sizeof(t)) != 0)
2762                         ret = -EFAULT;
2763         }
2764         break;
2765 
2766         default:
2767                 ret = -EINVAL;
2768         }
2769 
2770 out:
2771         mutex_unlock(&__ip_vs_mutex);
2772         return ret;
2773 }
2774 
2775 
2776 static struct nf_sockopt_ops ip_vs_sockopts = {
2777         .pf             = PF_INET,
2778         .set_optmin     = IP_VS_BASE_CTL,
2779         .set_optmax     = IP_VS_SO_SET_MAX+1,
2780         .set            = do_ip_vs_set_ctl,
2781         .get_optmin     = IP_VS_BASE_CTL,
2782         .get_optmax     = IP_VS_SO_GET_MAX+1,
2783         .get            = do_ip_vs_get_ctl,
2784         .owner          = THIS_MODULE,
2785 };
2786 
2787 /*
2788  * Generic Netlink interface
2789  */
2790 
2791 /* IPVS genetlink family */
2792 static struct genl_family ip_vs_genl_family = {
2793         .id             = GENL_ID_GENERATE,
2794         .hdrsize        = 0,
2795         .name           = IPVS_GENL_NAME,
2796         .version        = IPVS_GENL_VERSION,
2797         .maxattr        = IPVS_CMD_MAX,
2798         .netnsok        = true,         /* Make ipvsadm to work on netns */
2799 };
2800 
2801 /* Policy used for first-level command attributes */
2802 static const struct nla_policy ip_vs_cmd_policy[IPVS_CMD_ATTR_MAX + 1] = {
2803         [IPVS_CMD_ATTR_SERVICE]         = { .type = NLA_NESTED },
2804         [IPVS_CMD_ATTR_DEST]            = { .type = NLA_NESTED },
2805         [IPVS_CMD_ATTR_DAEMON]          = { .type = NLA_NESTED },
2806         [IPVS_CMD_ATTR_TIMEOUT_TCP]     = { .type = NLA_U32 },
2807         [IPVS_CMD_ATTR_TIMEOUT_TCP_FIN] = { .type = NLA_U32 },
2808         [IPVS_CMD_ATTR_TIMEOUT_UDP]     = { .type = NLA_U32 },
2809 };
2810 
2811 /* Policy used for attributes in nested attribute IPVS_CMD_ATTR_DAEMON */
2812 static const struct nla_policy ip_vs_daemon_policy[IPVS_DAEMON_ATTR_MAX + 1] = {
2813         [IPVS_DAEMON_ATTR_STATE]        = { .type = NLA_U32 },
2814         [IPVS_DAEMON_ATTR_MCAST_IFN]    = { .type = NLA_NUL_STRING,
2815                                             .len = IP_VS_IFNAME_MAXLEN },
2816         [IPVS_DAEMON_ATTR_SYNC_ID]      = { .type = NLA_U32 },
2817 };
2818 
2819 /* Policy used for attributes in nested attribute IPVS_CMD_ATTR_SERVICE */
2820 static const struct nla_policy ip_vs_svc_policy[IPVS_SVC_ATTR_MAX + 1] = {
2821         [IPVS_SVC_ATTR_AF]              = { .type = NLA_U16 },
2822         [IPVS_SVC_ATTR_PROTOCOL]        = { .type = NLA_U16 },
2823         [IPVS_SVC_ATTR_ADDR]            = { .type = NLA_BINARY,
2824                                             .len = sizeof(union nf_inet_addr) },
2825         [IPVS_SVC_ATTR_PORT]            = { .type = NLA_U16 },
2826         [IPVS_SVC_ATTR_FWMARK]          = { .type = NLA_U32 },
2827         [IPVS_SVC_ATTR_SCHED_NAME]      = { .type = NLA_NUL_STRING,
2828                                             .len = IP_VS_SCHEDNAME_MAXLEN },
2829         [IPVS_SVC_ATTR_PE_NAME]         = { .type = NLA_NUL_STRING,
2830                                             .len = IP_VS_PENAME_MAXLEN },
2831         [IPVS_SVC_ATTR_FLAGS]           = { .type = NLA_BINARY,
2832                                             .len = sizeof(struct ip_vs_flags) },
2833         [IPVS_SVC_ATTR_TIMEOUT]         = { .type = NLA_U32 },
2834         [IPVS_SVC_ATTR_NETMASK]         = { .type = NLA_U32 },
2835         [IPVS_SVC_ATTR_STATS]           = { .type = NLA_NESTED },
2836 };
2837 
2838 /* Policy used for attributes in nested attribute IPVS_CMD_ATTR_DEST */
2839 static const struct nla_policy ip_vs_dest_policy[IPVS_DEST_ATTR_MAX + 1] = {
2840         [IPVS_DEST_ATTR_ADDR]           = { .type = NLA_BINARY,
2841                                             .len = sizeof(union nf_inet_addr) },
2842         [IPVS_DEST_ATTR_PORT]           = { .type = NLA_U16 },
2843         [IPVS_DEST_ATTR_FWD_METHOD]     = { .type = NLA_U32 },
2844         [IPVS_DEST_ATTR_WEIGHT]         = { .type = NLA_U32 },
2845         [IPVS_DEST_ATTR_U_THRESH]       = { .type = NLA_U32 },
2846         [IPVS_DEST_ATTR_L_THRESH]       = { .type = NLA_U32 },
2847         [IPVS_DEST_ATTR_ACTIVE_CONNS]   = { .type = NLA_U32 },
2848         [IPVS_DEST_ATTR_INACT_CONNS]    = { .type = NLA_U32 },
2849         [IPVS_DEST_ATTR_PERSIST_CONNS]  = { .type = NLA_U32 },
2850         [IPVS_DEST_ATTR_STATS]          = { .type = NLA_NESTED },
2851 };
2852 
2853 static int ip_vs_genl_fill_stats(struct sk_buff *skb, int container_type,
2854                                  struct ip_vs_stats *stats)
2855 {
2856         struct ip_vs_stats_user ustats;
2857         struct nlattr *nl_stats = nla_nest_start(skb, container_type);
2858         if (!nl_stats)
2859                 return -EMSGSIZE;
2860 
2861         ip_vs_copy_stats(&ustats, stats);
2862 
2863         if (nla_put_u32(skb, IPVS_STATS_ATTR_CONNS, ustats.conns) ||
2864             nla_put_u32(skb, IPVS_STATS_ATTR_INPKTS, ustats.inpkts) ||
2865             nla_put_u32(skb, IPVS_STATS_ATTR_OUTPKTS, ustats.outpkts) ||
2866             nla_put_u64(skb, IPVS_STATS_ATTR_INBYTES, ustats.inbytes) ||
2867             nla_put_u64(skb, IPVS_STATS_ATTR_OUTBYTES, ustats.outbytes) ||
2868             nla_put_u32(skb, IPVS_STATS_ATTR_CPS, ustats.cps) ||
2869             nla_put_u32(skb, IPVS_STATS_ATTR_INPPS, ustats.inpps) ||
2870             nla_put_u32(skb, IPVS_STATS_ATTR_OUTPPS, ustats.outpps) ||
2871             nla_put_u32(skb, IPVS_STATS_ATTR_INBPS, ustats.inbps) ||
2872             nla_put_u32(skb, IPVS_STATS_ATTR_OUTBPS, ustats.outbps))
2873                 goto nla_put_failure;
2874         nla_nest_end(skb, nl_stats);
2875 
2876         return 0;
2877 
2878 nla_put_failure:
2879         nla_nest_cancel(skb, nl_stats);
2880         return -EMSGSIZE;
2881 }
2882 
2883 static int ip_vs_genl_fill_service(struct sk_buff *skb,
2884                                    struct ip_vs_service *svc)
2885 {
2886         struct ip_vs_scheduler *sched;
2887         struct ip_vs_pe *pe;
2888         struct nlattr *nl_service;
2889         struct ip_vs_flags flags = { .flags = svc->flags,
2890                                      .mask = ~0 };
2891 
2892         nl_service = nla_nest_start(skb, IPVS_CMD_ATTR_SERVICE);
2893         if (!nl_service)
2894                 return -EMSGSIZE;
2895 
2896         if (nla_put_u16(skb, IPVS_SVC_ATTR_AF, svc->af))
2897                 goto nla_put_failure;
2898         if (svc->fwmark) {
2899                 if (nla_put_u32(skb, IPVS_SVC_ATTR_FWMARK, svc->fwmark))
2900                         goto nla_put_failure;
2901         } else {
2902                 if (nla_put_u16(skb, IPVS_SVC_ATTR_PROTOCOL, svc->protocol) ||
2903                     nla_put(skb, IPVS_SVC_ATTR_ADDR, sizeof(svc->addr), &svc->addr) ||
2904                     nla_put_be16(skb, IPVS_SVC_ATTR_PORT, svc->port))
2905                         goto nla_put_failure;
2906         }
2907 
2908         sched = rcu_dereference_protected(svc->scheduler, 1);
2909         pe = rcu_dereference_protected(svc->pe, 1);
2910         if (nla_put_string(skb, IPVS_SVC_ATTR_SCHED_NAME, sched->name) ||
2911             (pe && nla_put_string(skb, IPVS_SVC_ATTR_PE_NAME, pe->name)) ||
2912             nla_put(skb, IPVS_SVC_ATTR_FLAGS, sizeof(flags), &flags) ||
2913             nla_put_u32(skb, IPVS_SVC_ATTR_TIMEOUT, svc->timeout / HZ) ||
2914             nla_put_be32(skb, IPVS_SVC_ATTR_NETMASK, svc->netmask))
2915                 goto nla_put_failure;
2916         if (ip_vs_genl_fill_stats(skb, IPVS_SVC_ATTR_STATS, &svc->stats))
2917                 goto nla_put_failure;
2918 
2919         nla_nest_end(skb, nl_service);
2920 
2921         return 0;
2922 
2923 nla_put_failure:
2924         nla_nest_cancel(skb, nl_service);
2925         return -EMSGSIZE;
2926 }
2927 
2928 static int ip_vs_genl_dump_service(struct sk_buff *skb,
2929                                    struct ip_vs_service *svc,
2930                                    struct netlink_callback *cb)
2931 {
2932         void *hdr;
2933 
2934         hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
2935                           &ip_vs_genl_family, NLM_F_MULTI,
2936                           IPVS_CMD_NEW_SERVICE);
2937         if (!hdr)
2938                 return -EMSGSIZE;
2939 
2940         if (ip_vs_genl_fill_service(skb, svc) < 0)
2941                 goto nla_put_failure;
2942 
2943         return genlmsg_end(skb, hdr);
2944 
2945 nla_put_failure:
2946         genlmsg_cancel(skb, hdr);
2947         return -EMSGSIZE;
2948 }
2949 
2950 static int ip_vs_genl_dump_services(struct sk_buff *skb,
2951                                     struct netlink_callback *cb)
2952 {
2953         int idx = 0, i;
2954         int start = cb->args[0];
2955         struct ip_vs_service *svc;
2956         struct net *net = skb_sknet(skb);
2957 
2958         mutex_lock(&__ip_vs_mutex);
2959         for (i = 0; i < IP_VS_SVC_TAB_SIZE; i++) {
2960                 hlist_for_each_entry(svc, &ip_vs_svc_table[i], s_list) {
2961                         if (++idx <= start || !net_eq(svc->net, net))
2962                                 continue;
2963                         if (ip_vs_genl_dump_service(skb, svc, cb) < 0) {
2964                                 idx--;
2965                                 goto nla_put_failure;
2966                         }
2967                 }
2968         }
2969 
2970         for (i = 0; i < IP_VS_SVC_TAB_SIZE; i++) {
2971                 hlist_for_each_entry(svc, &ip_vs_svc_fwm_table[i], f_list) {
2972                         if (++idx <= start || !net_eq(svc->net, net))
2973                                 continue;
2974                         if (ip_vs_genl_dump_service(skb, svc, cb) < 0) {
2975                                 idx--;
2976                                 goto nla_put_failure;
2977                         }
2978                 }
2979         }
2980 
2981 nla_put_failure:
2982         mutex_unlock(&__ip_vs_mutex);
2983         cb->args[0] = idx;
2984 
2985         return skb->len;
2986 }
2987 
2988 static int ip_vs_genl_parse_service(struct net *net,
2989                                     struct ip_vs_service_user_kern *usvc,
2990                                     struct nlattr *nla, int full_entry,
2991                                     struct ip_vs_service **ret_svc)
2992 {
2993         struct nlattr *attrs[IPVS_SVC_ATTR_MAX + 1];
2994         struct nlattr *nla_af, *nla_port, *nla_fwmark, *nla_protocol, *nla_addr;
2995         struct ip_vs_service *svc;
2996 
2997         /* Parse mandatory identifying service fields first */
2998         if (nla == NULL ||
2999             nla_parse_nested(attrs, IPVS_SVC_ATTR_MAX, nla, ip_vs_svc_policy))
3000                 return -EINVAL;
3001 
3002         nla_af          = attrs[IPVS_SVC_ATTR_AF];
3003         nla_protocol    = attrs[IPVS_SVC_ATTR_PROTOCOL];
3004         nla_addr        = attrs[IPVS_SVC_ATTR_ADDR];
3005         nla_port        = attrs[IPVS_SVC_ATTR_PORT];
3006         nla_fwmark      = attrs[IPVS_SVC_ATTR_FWMARK];
3007 
3008         if (!(nla_af && (nla_fwmark || (nla_port && nla_protocol && nla_addr))))
3009                 return -EINVAL;
3010 
3011         memset(usvc, 0, sizeof(*usvc));
3012 
3013         usvc->af = nla_get_u16(nla_af);
3014 #ifdef CONFIG_IP_VS_IPV6
3015         if (usvc->af != AF_INET && usvc->af != AF_INET6)
3016 #else
3017         if (usvc->af != AF_INET)
3018 #endif
3019                 return -EAFNOSUPPORT;
3020 
3021         if (nla_fwmark) {
3022                 usvc->protocol = IPPROTO_TCP;
3023                 usvc->fwmark = nla_get_u32(nla_fwmark);
3024         } else {
3025                 usvc->protocol = nla_get_u16(nla_protocol);
3026                 nla_memcpy(&usvc->addr, nla_addr, sizeof(usvc->addr));
3027                 usvc->port = nla_get_be16(nla_port);
3028                 usvc->fwmark = 0;
3029         }
3030 
3031         rcu_read_lock();
3032         if (usvc->fwmark)
3033                 svc = __ip_vs_svc_fwm_find(net, usvc->af, usvc->fwmark);
3034         else
3035                 svc = __ip_vs_service_find(net, usvc->af, usvc->protocol,
3036                                            &usvc->addr, usvc->port);
3037         rcu_read_unlock();
3038         *ret_svc = svc;
3039 
3040         /* If a full entry was requested, check for the additional fields */
3041         if (full_entry) {
3042                 struct nlattr *nla_sched, *nla_flags, *nla_pe, *nla_timeout,
3043                               *nla_netmask;
3044                 struct ip_vs_flags flags;
3045 
3046                 nla_sched = attrs[IPVS_SVC_ATTR_SCHED_NAME];
3047                 nla_pe = attrs[IPVS_SVC_ATTR_PE_NAME];
3048                 nla_flags = attrs[IPVS_SVC_ATTR_FLAGS];
3049                 nla_timeout = attrs[IPVS_SVC_ATTR_TIMEOUT];
3050                 nla_netmask = attrs[IPVS_SVC_ATTR_NETMASK];
3051 
3052                 if (!(nla_sched && nla_flags && nla_timeout && nla_netmask))
3053                         return -EINVAL;
3054 
3055                 nla_memcpy(&flags, nla_flags, sizeof(flags));
3056 
3057                 /* prefill flags from service if it already exists */
3058                 if (svc)
3059                         usvc->flags = svc->flags;
3060 
3061                 /* set new flags from userland */
3062                 usvc->flags = (usvc->flags & ~flags.mask) |
3063                               (flags.flags & flags.mask);
3064                 usvc->sched_name = nla_data(nla_sched);
3065                 usvc->pe_name = nla_pe ? nla_data(nla_pe) : NULL;
3066                 usvc->timeout = nla_get_u32(nla_timeout);
3067                 usvc->netmask = nla_get_be32(nla_netmask);
3068         }
3069 
3070         return 0;
3071 }
3072 
3073 static struct ip_vs_service *ip_vs_genl_find_service(struct net *net,
3074                                                      struct nlattr *nla)
3075 {
3076         struct ip_vs_service_user_kern usvc;
3077         struct ip_vs_service *svc;
3078         int ret;
3079 
3080         ret = ip_vs_genl_parse_service(net, &usvc, nla, 0, &svc);
3081         return ret ? ERR_PTR(ret) : svc;
3082 }
3083 
3084 static int ip_vs_genl_fill_dest(struct sk_buff *skb, struct ip_vs_dest *dest)
3085 {
3086         struct nlattr *nl_dest;
3087 
3088         nl_dest = nla_nest_start(skb, IPVS_CMD_ATTR_DEST);
3089         if (!nl_dest)
3090                 return -EMSGSIZE;
3091 
3092         if (nla_put(skb, IPVS_DEST_ATTR_ADDR, sizeof(dest->addr), &dest->addr) ||
3093             nla_put_be16(skb, IPVS_DEST_ATTR_PORT, dest->port) ||
3094             nla_put_u32(skb, IPVS_DEST_ATTR_FWD_METHOD,
3095                         (atomic_read(&dest->conn_flags) &
3096                          IP_VS_CONN_F_FWD_MASK)) ||
3097             nla_put_u32(skb, IPVS_DEST_ATTR_WEIGHT,
3098                         atomic_read(&dest->weight)) ||
3099             nla_put_u32(skb, IPVS_DEST_ATTR_U_THRESH, dest->u_threshold) ||
3100             nla_put_u32(skb, IPVS_DEST_ATTR_L_THRESH, dest->l_threshold) ||
3101             nla_put_u32(skb, IPVS_DEST_ATTR_ACTIVE_CONNS,
3102                         atomic_read(&dest->activeconns)) ||
3103             nla_put_u32(skb, IPVS_DEST_ATTR_INACT_CONNS,
3104                         atomic_read(&dest->inactconns)) ||
3105             nla_put_u32(skb, IPVS_DEST_ATTR_PERSIST_CONNS,
3106                         atomic_read(&dest->persistconns)))
3107                 goto nla_put_failure;
3108         if (ip_vs_genl_fill_stats(skb, IPVS_DEST_ATTR_STATS, &dest->stats))
3109                 goto nla_put_failure;
3110 
3111         nla_nest_end(skb, nl_dest);
3112 
3113         return 0;
3114 
3115 nla_put_failure:
3116         nla_nest_cancel(skb, nl_dest);
3117         return -EMSGSIZE;
3118 }
3119 
3120 static int ip_vs_genl_dump_dest(struct sk_buff *skb, struct ip_vs_dest *dest,
3121                                 struct netlink_callback *cb)
3122 {
3123         void *hdr;
3124 
3125         hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
3126                           &ip_vs_genl_family, NLM_F_MULTI,
3127                           IPVS_CMD_NEW_DEST);
3128         if (!hdr)
3129                 return -EMSGSIZE;
3130 
3131         if (ip_vs_genl_fill_dest(skb, dest) < 0)
3132                 goto nla_put_failure;
3133 
3134         return genlmsg_end(skb, hdr);
3135 
3136 nla_put_failure:
3137         genlmsg_cancel(skb, hdr);
3138         return -EMSGSIZE;
3139 }
3140 
3141 static int ip_vs_genl_dump_dests(struct sk_buff *skb,
3142                                  struct netlink_callback *cb)
3143 {
3144         int idx = 0;
3145         int start = cb->args[0];
3146         struct ip_vs_service *svc;
3147         struct ip_vs_dest *dest;
3148         struct nlattr *attrs[IPVS_CMD_ATTR_MAX + 1];
3149         struct net *net = skb_sknet(skb);
3150 
3151         mutex_lock(&__ip_vs_mutex);
3152 
3153         /* Try to find the service for which to dump destinations */
3154         if (nlmsg_parse(cb->nlh, GENL_HDRLEN, attrs,
3155                         IPVS_CMD_ATTR_MAX, ip_vs_cmd_policy))
3156                 goto out_err;
3157 
3158 
3159         svc = ip_vs_genl_find_service(net, attrs[IPVS_CMD_ATTR_SERVICE]);
3160         if (IS_ERR(svc) || svc == NULL)
3161                 goto out_err;
3162 
3163         /* Dump the destinations */
3164         list_for_each_entry(dest, &svc->destinations, n_list) {
3165                 if (++idx <= start)
3166                         continue;
3167                 if (ip_vs_genl_dump_dest(skb, dest, cb) < 0) {
3168                         idx--;
3169                         goto nla_put_failure;
3170                 }
3171         }
3172 
3173 nla_put_failure:
3174         cb->args[0] = idx;
3175 
3176 out_err:
3177         mutex_unlock(&__ip_vs_mutex);
3178 
3179         return skb->len;
3180 }
3181 
3182 static int ip_vs_genl_parse_dest(struct ip_vs_dest_user_kern *udest,
3183                                  struct nlattr *nla, int full_entry)
3184 {
3185         struct nlattr *attrs[IPVS_DEST_ATTR_MAX + 1];
3186         struct nlattr *nla_addr, *nla_port;
3187 
3188         /* Parse mandatory identifying destination fields first */
3189         if (nla == NULL ||
3190             nla_parse_nested(attrs, IPVS_DEST_ATTR_MAX, nla, ip_vs_dest_policy))
3191                 return -EINVAL;
3192 
3193         nla_addr        = attrs[IPVS_DEST_ATTR_ADDR];
3194         nla_port        = attrs[IPVS_DEST_ATTR_PORT];
3195 
3196         if (!(nla_addr && nla_port))
3197                 return -EINVAL;
3198 
3199         memset(udest, 0, sizeof(*udest));
3200 
3201         nla_memcpy(&udest->addr, nla_addr, sizeof(udest->addr));
3202         udest->port = nla_get_be16(nla_port);
3203 
3204         /* If a full entry was requested, check for the additional fields */
3205         if (full_entry) {
3206                 struct nlattr *nla_fwd, *nla_weight, *nla_u_thresh,
3207                               *nla_l_thresh;
3208 
3209                 nla_fwd         = attrs[IPVS_DEST_ATTR_FWD_METHOD];
3210                 nla_weight      = attrs[IPVS_DEST_ATTR_WEIGHT];
3211                 nla_u_thresh    = attrs[IPVS_DEST_ATTR_U_THRESH];
3212                 nla_l_thresh    = attrs[IPVS_DEST_ATTR_L_THRESH];
3213 
3214                 if (!(nla_fwd && nla_weight && nla_u_thresh && nla_l_thresh))
3215                         return -EINVAL;
3216 
3217                 udest->conn_flags = nla_get_u32(nla_fwd)
3218                                     & IP_VS_CONN_F_FWD_MASK;
3219                 udest->weight = nla_get_u32(nla_weight);
3220                 udest->u_threshold = nla_get_u32(nla_u_thresh);
3221                 udest->l_threshold = nla_get_u32(nla_l_thresh);
3222         }
3223 
3224         return 0;
3225 }
3226 
3227 static int ip_vs_genl_fill_daemon(struct sk_buff *skb, __u32 state,
3228                                   const char *mcast_ifn, __u32 syncid)
3229 {
3230         struct nlattr *nl_daemon;
3231 
3232         nl_daemon = nla_nest_start(skb, IPVS_CMD_ATTR_DAEMON);
3233         if (!nl_daemon)
3234                 return -EMSGSIZE;
3235 
3236         if (nla_put_u32(skb, IPVS_DAEMON_ATTR_STATE, state) ||
3237             nla_put_string(skb, IPVS_DAEMON_ATTR_MCAST_IFN, mcast_ifn) ||
3238             nla_put_u32(skb, IPVS_DAEMON_ATTR_SYNC_ID, syncid))
3239                 goto nla_put_failure;
3240         nla_nest_end(skb, nl_daemon);
3241 
3242         return 0;
3243 
3244 nla_put_failure:
3245         nla_nest_cancel(skb, nl_daemon);
3246         return -EMSGSIZE;
3247 }
3248 
3249 static int ip_vs_genl_dump_daemon(struct sk_buff *skb, __u32 state,
3250                                   const char *mcast_ifn, __u32 syncid,
3251                                   struct netlink_callback *cb)
3252 {
3253         void *hdr;
3254         hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
3255                           &ip_vs_genl_family, NLM_F_MULTI,
3256                           IPVS_CMD_NEW_DAEMON);
3257         if (!hdr)
3258                 return -EMSGSIZE;
3259 
3260         if (ip_vs_genl_fill_daemon(skb, state, mcast_ifn, syncid))
3261                 goto nla_put_failure;
3262 
3263         return genlmsg_end(skb, hdr);
3264 
3265 nla_put_failure:
3266         genlmsg_cancel(skb, hdr);
3267         return -EMSGSIZE;
3268 }
3269 
3270 static int ip_vs_genl_dump_daemons(struct sk_buff *skb,
3271                                    struct netlink_callback *cb)
3272 {
3273         struct net *net = skb_sknet(skb);
3274         struct netns_ipvs *ipvs = net_ipvs(net);
3275 
3276         mutex_lock(&ipvs->sync_mutex);
3277         if ((ipvs->sync_state & IP_VS_STATE_MASTER) && !cb->args[0]) {
3278                 if (ip_vs_genl_dump_daemon(skb, IP_VS_STATE_MASTER,
3279                                            ipvs->master_mcast_ifn,
3280                                            ipvs->master_syncid, cb) < 0)
3281                         goto nla_put_failure;
3282 
3283                 cb->args[0] = 1;
3284         }
3285 
3286         if ((ipvs->sync_state & IP_VS_STATE_BACKUP) && !cb->args[1]) {
3287                 if (ip_vs_genl_dump_daemon(skb, IP_VS_STATE_BACKUP,
3288                                            ipvs->backup_mcast_ifn,
3289                                            ipvs->backup_syncid, cb) < 0)
3290                         goto nla_put_failure;
3291 
3292                 cb->args[1] = 1;
3293         }
3294 
3295 nla_put_failure:
3296         mutex_unlock(&ipvs->sync_mutex);
3297 
3298         return skb->len;
3299 }
3300 
3301 static int ip_vs_genl_new_daemon(struct net *net, struct nlattr **attrs)
3302 {
3303         if (!(attrs[IPVS_DAEMON_ATTR_STATE] &&
3304               attrs[IPVS_DAEMON_ATTR_MCAST_IFN] &&
3305               attrs[IPVS_DAEMON_ATTR_SYNC_ID]))
3306                 return -EINVAL;
3307 
3308         return start_sync_thread(net,
3309                                  nla_get_u32(attrs[IPVS_DAEMON_ATTR_STATE]),
3310                                  nla_data(attrs[IPVS_DAEMON_ATTR_MCAST_IFN]),
3311                                  nla_get_u32(attrs[IPVS_DAEMON_ATTR_SYNC_ID]));
3312 }
3313 
3314 static int ip_vs_genl_del_daemon(struct net *net, struct nlattr **attrs)
3315 {
3316         if (!attrs[IPVS_DAEMON_ATTR_STATE])
3317                 return -EINVAL;
3318 
3319         return stop_sync_thread(net,
3320                                 nla_get_u32(attrs[IPVS_DAEMON_ATTR_STATE]));
3321 }
3322 
3323 static int ip_vs_genl_set_config(struct net *net, struct nlattr **attrs)
3324 {
3325         struct ip_vs_timeout_user t;
3326 
3327         __ip_vs_get_timeouts(net, &t);
3328 
3329         if (attrs[IPVS_CMD_ATTR_TIMEOUT_TCP])
3330                 t.tcp_timeout = nla_get_u32(attrs[IPVS_CMD_ATTR_TIMEOUT_TCP]);
3331 
3332         if (attrs[IPVS_CMD_ATTR_TIMEOUT_TCP_FIN])
3333                 t.tcp_fin_timeout =
3334                         nla_get_u32(attrs[IPVS_CMD_ATTR_TIMEOUT_TCP_FIN]);
3335 
3336         if (attrs[IPVS_CMD_ATTR_TIMEOUT_UDP])
3337                 t.udp_timeout = nla_get_u32(attrs[IPVS_CMD_ATTR_TIMEOUT_UDP]);
3338 
3339         return ip_vs_set_timeout(net, &t);
3340 }
3341 
3342 static int ip_vs_genl_set_daemon(struct sk_buff *skb, struct genl_info *info)
3343 {
3344         int ret = 0, cmd;
3345         struct net *net;
3346         struct netns_ipvs *ipvs;
3347 
3348         net = skb_sknet(skb);
3349         ipvs = net_ipvs(net);
3350         cmd = info->genlhdr->cmd;
3351 
3352         if (cmd == IPVS_CMD_NEW_DAEMON || cmd == IPVS_CMD_DEL_DAEMON) {
3353                 struct nlattr *daemon_attrs[IPVS_DAEMON_ATTR_MAX + 1];
3354 
3355                 mutex_lock(&ipvs->sync_mutex);
3356                 if (!info->attrs[IPVS_CMD_ATTR_DAEMON] ||
3357                     nla_parse_nested(daemon_attrs, IPVS_DAEMON_ATTR_MAX,
3358                                      info->attrs[IPVS_CMD_ATTR_DAEMON],
3359                                      ip_vs_daemon_policy)) {
3360                         ret = -EINVAL;
3361                         goto out;
3362                 }
3363 
3364                 if (cmd == IPVS_CMD_NEW_DAEMON)
3365                         ret = ip_vs_genl_new_daemon(net, daemon_attrs);
3366                 else
3367                         ret = ip_vs_genl_del_daemon(net, daemon_attrs);
3368 out:
3369                 mutex_unlock(&ipvs->sync_mutex);
3370         }
3371         return ret;
3372 }
3373 
3374 static int ip_vs_genl_set_cmd(struct sk_buff *skb, struct genl_info *info)
3375 {
3376         struct ip_vs_service *svc = NULL;
3377         struct ip_vs_service_user_kern usvc;
3378         struct ip_vs_dest_user_kern udest;
3379         int ret = 0, cmd;
3380         int need_full_svc = 0, need_full_dest = 0;
3381         struct net *net;
3382 
3383         net = skb_sknet(skb);
3384         cmd = info->genlhdr->cmd;
3385 
3386         mutex_lock(&__ip_vs_mutex);
3387 
3388         if (cmd == IPVS_CMD_FLUSH) {
3389                 ret = ip_vs_flush(net, false);
3390                 goto out;
3391         } else if (cmd == IPVS_CMD_SET_CONFIG) {
3392                 ret = ip_vs_genl_set_config(net, info->attrs);
3393                 goto out;
3394         } else if (cmd == IPVS_CMD_ZERO &&
3395                    !info->attrs[IPVS_CMD_ATTR_SERVICE]) {
3396                 ret = ip_vs_zero_all(net);
3397                 goto out;
3398         }
3399 
3400         /* All following commands require a service argument, so check if we
3401          * received a valid one. We need a full service specification when
3402          * adding / editing a service. Only identifying members otherwise. */
3403         if (cmd == IPVS_CMD_NEW_SERVICE || cmd == IPVS_CMD_SET_SERVICE)
3404                 need_full_svc = 1;
3405 
3406         ret = ip_vs_genl_parse_service(net, &usvc,
3407                                        info->attrs[IPVS_CMD_ATTR_SERVICE],
3408                                        need_full_svc, &svc);
3409         if (ret)
3410                 goto out;
3411 
3412         /* Unless we're adding a new service, the service must already exist */
3413         if ((cmd != IPVS_CMD_NEW_SERVICE) && (svc == NULL)) {
3414                 ret = -ESRCH;
3415                 goto out;
3416         }
3417 
3418         /* Destination commands require a valid destination argument. For
3419          * adding / editing a destination, we need a full destination
3420          * specification. */
3421         if (cmd == IPVS_CMD_NEW_DEST || cmd == IPVS_CMD_SET_DEST ||
3422             cmd == IPVS_CMD_DEL_DEST) {
3423                 if (cmd != IPVS_CMD_DEL_DEST)
3424                         need_full_dest = 1;
3425 
3426                 ret = ip_vs_genl_parse_dest(&udest,
3427                                             info->attrs[IPVS_CMD_ATTR_DEST],
3428                                             need_full_dest);
3429                 if (ret)
3430                         goto out;
3431         }
3432 
3433         switch (cmd) {
3434         case IPVS_CMD_NEW_SERVICE:
3435                 if (svc == NULL)
3436                         ret = ip_vs_add_service(net, &usvc, &svc);
3437                 else
3438                         ret = -EEXIST;
3439                 break;
3440         case IPVS_CMD_SET_SERVICE:
3441                 ret = ip_vs_edit_service(svc, &usvc);
3442                 break;
3443         case IPVS_CMD_DEL_SERVICE:
3444                 ret = ip_vs_del_service(svc);
3445                 /* do not use svc, it can be freed */
3446                 break;
3447         case IPVS_CMD_NEW_DEST:
3448                 ret = ip_vs_add_dest(svc, &udest);
3449                 break;
3450         case IPVS_CMD_SET_DEST:
3451                 ret = ip_vs_edit_dest(svc, &udest);
3452                 break;
3453         case IPVS_CMD_DEL_DEST:
3454                 ret = ip_vs_del_dest(svc, &udest);
3455                 break;
3456         case IPVS_CMD_ZERO:
3457                 ret = ip_vs_zero_service(svc);
3458                 break;
3459         default:
3460                 ret = -EINVAL;
3461         }
3462 
3463 out:
3464         mutex_unlock(&__ip_vs_mutex);
3465 
3466         return ret;
3467 }
3468 
3469 static int ip_vs_genl_get_cmd(struct sk_buff *skb, struct genl_info *info)
3470 {
3471         struct sk_buff *msg;
3472         void *reply;
3473         int ret, cmd, reply_cmd;
3474         struct net *net;
3475 
3476         net = skb_sknet(skb);
3477         cmd = info->genlhdr->cmd;
3478 
3479         if (cmd == IPVS_CMD_GET_SERVICE)
3480                 reply_cmd = IPVS_CMD_NEW_SERVICE;
3481         else if (cmd == IPVS_CMD_GET_INFO)
3482                 reply_cmd = IPVS_CMD_SET_INFO;
3483         else if (cmd == IPVS_CMD_GET_CONFIG)
3484                 reply_cmd = IPVS_CMD_SET_CONFIG;
3485         else {
3486                 pr_err("unknown Generic Netlink command\n");
3487                 return -EINVAL;
3488         }
3489 
3490         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
3491         if (!msg)
3492                 return -ENOMEM;
3493 
3494         mutex_lock(&__ip_vs_mutex);
3495 
3496         reply = genlmsg_put_reply(msg, info, &ip_vs_genl_family, 0, reply_cmd);
3497         if (reply == NULL)
3498                 goto nla_put_failure;
3499 
3500         switch (cmd) {
3501         case IPVS_CMD_GET_SERVICE:
3502         {
3503                 struct ip_vs_service *svc;
3504 
3505                 svc = ip_vs_genl_find_service(net,
3506                                               info->attrs[IPVS_CMD_ATTR_SERVICE]);
3507                 if (IS_ERR(svc)) {
3508                         ret = PTR_ERR(svc);
3509                         goto out_err;
3510                 } else if (svc) {
3511                         ret = ip_vs_genl_fill_service(msg, svc);
3512                         if (ret)
3513                                 goto nla_put_failure;
3514                 } else {
3515                         ret = -ESRCH;
3516                         goto out_err;
3517                 }
3518 
3519                 break;
3520         }
3521 
3522         case IPVS_CMD_GET_CONFIG:
3523         {
3524                 struct ip_vs_timeout_user t;
3525 
3526                 __ip_vs_get_timeouts(net, &t);
3527 #ifdef CONFIG_IP_VS_PROTO_TCP
3528                 if (nla_put_u32(msg, IPVS_CMD_ATTR_TIMEOUT_TCP,
3529                                 t.tcp_timeout) ||
3530                     nla_put_u32(msg, IPVS_CMD_ATTR_TIMEOUT_TCP_FIN,
3531                                 t.tcp_fin_timeout))
3532                         goto nla_put_failure;
3533 #endif
3534 #ifdef CONFIG_IP_VS_PROTO_UDP
3535                 if (nla_put_u32(msg, IPVS_CMD_ATTR_TIMEOUT_UDP, t.udp_timeout))
3536                         goto nla_put_failure;
3537 #endif
3538 
3539                 break;
3540         }
3541 
3542         case IPVS_CMD_GET_INFO:
3543                 if (nla_put_u32(msg, IPVS_INFO_ATTR_VERSION,
3544                                 IP_VS_VERSION_CODE) ||
3545                     nla_put_u32(msg, IPVS_INFO_ATTR_CONN_TAB_SIZE,
3546                                 ip_vs_conn_tab_size))
3547                         goto nla_put_failure;
3548                 break;
3549         }
3550 
3551         genlmsg_end(msg, reply);
3552         ret = genlmsg_reply(msg, info);
3553         goto out;
3554 
3555 nla_put_failure:
3556         pr_err("not enough space in Netlink message\n");
3557         ret = -EMSGSIZE;
3558 
3559 out_err:
3560         nlmsg_free(msg);
3561 out:
3562         mutex_unlock(&__ip_vs_mutex);
3563 
3564         return ret;
3565 }
3566 
3567 
3568 static struct genl_ops ip_vs_genl_ops[] __read_mostly = {
3569         {
3570                 .cmd    = IPVS_CMD_NEW_SERVICE,
3571                 .flags  = GENL_ADMIN_PERM,
3572                 .policy = ip_vs_cmd_policy,
3573                 .doit   = ip_vs_genl_set_cmd,
3574         },
3575         {
3576                 .cmd    = IPVS_CMD_SET_SERVICE,
3577                 .flags  = GENL_ADMIN_PERM,
3578                 .policy = ip_vs_cmd_policy,
3579                 .doit   = ip_vs_genl_set_cmd,
3580         },
3581         {
3582                 .cmd    = IPVS_CMD_DEL_SERVICE,
3583                 .flags  = GENL_ADMIN_PERM,
3584                 .policy = ip_vs_cmd_policy,
3585                 .doit   = ip_vs_genl_set_cmd,
3586         },
3587         {
3588                 .cmd    = IPVS_CMD_GET_SERVICE,
3589                 .flags  = GENL_ADMIN_PERM,
3590                 .doit   = ip_vs_genl_get_cmd,
3591                 .dumpit = ip_vs_genl_dump_services,
3592                 .policy = ip_vs_cmd_policy,
3593         },
3594         {
3595                 .cmd    = IPVS_CMD_NEW_DEST,
3596                 .flags  = GENL_ADMIN_PERM,
3597                 .policy = ip_vs_cmd_policy,
3598                 .doit   = ip_vs_genl_set_cmd,
3599         },
3600         {
3601                 .cmd    = IPVS_CMD_SET_DEST,
3602                 .flags  = GENL_ADMIN_PERM,
3603                 .policy = ip_vs_cmd_policy,
3604                 .doit   = ip_vs_genl_set_cmd,
3605         },
3606         {
3607                 .cmd    = IPVS_CMD_DEL_DEST,
3608                 .flags  = GENL_ADMIN_PERM,
3609                 .policy = ip_vs_cmd_policy,
3610                 .doit   = ip_vs_genl_set_cmd,
3611         },
3612         {
3613                 .cmd    = IPVS_CMD_GET_DEST,
3614                 .flags  = GENL_ADMIN_PERM,
3615                 .policy = ip_vs_cmd_policy,
3616                 .dumpit = ip_vs_genl_dump_dests,
3617         },
3618         {
3619                 .cmd    = IPVS_CMD_NEW_DAEMON,
3620                 .flags  = GENL_ADMIN_PERM,
3621                 .policy = ip_vs_cmd_policy,
3622                 .doit   = ip_vs_genl_set_daemon,
3623         },
3624         {
3625                 .cmd    = IPVS_CMD_DEL_DAEMON,
3626                 .flags  = GENL_ADMIN_PERM,
3627                 .policy = ip_vs_cmd_policy,
3628                 .doit   = ip_vs_genl_set_daemon,
3629         },
3630         {
3631                 .cmd    = IPVS_CMD_GET_DAEMON,
3632                 .flags  = GENL_ADMIN_PERM,
3633                 .dumpit = ip_vs_genl_dump_daemons,
3634         },
3635         {
3636                 .cmd    = IPVS_CMD_SET_CONFIG,
3637                 .flags  = GENL_ADMIN_PERM,
3638                 .policy = ip_vs_cmd_policy,
3639                 .doit   = ip_vs_genl_set_cmd,
3640         },
3641         {
3642                 .cmd    = IPVS_CMD_GET_CONFIG,
3643                 .flags  = GENL_ADMIN_PERM,
3644                 .doit   = ip_vs_genl_get_cmd,
3645         },
3646         {
3647                 .cmd    = IPVS_CMD_GET_INFO,
3648                 .flags  = GENL_ADMIN_PERM,
3649                 .doit   = ip_vs_genl_get_cmd,
3650         },
3651         {
3652                 .cmd    = IPVS_CMD_ZERO,
3653                 .flags  = GENL_ADMIN_PERM,
3654                 .policy = ip_vs_cmd_policy,
3655                 .doit   = ip_vs_genl_set_cmd,
3656         },
3657         {
3658                 .cmd    = IPVS_CMD_FLUSH,
3659                 .flags  = GENL_ADMIN_PERM,
3660                 .doit   = ip_vs_genl_set_cmd,
3661         },
3662 };
3663 
3664 static int __init ip_vs_genl_register(void)
3665 {
3666         return genl_register_family_with_ops(&ip_vs_genl_family,
3667                 ip_vs_genl_ops, ARRAY_SIZE(ip_vs_genl_ops));
3668 }
3669 
3670 static void ip_vs_genl_unregister(void)
3671 {
3672         genl_unregister_family(&ip_vs_genl_family);
3673 }
3674 
3675 /* End of Generic Netlink interface definitions */
3676 
3677 /*
3678  * per netns intit/exit func.
3679  */
3680 #ifdef CONFIG_SYSCTL
3681 static int __net_init ip_vs_control_net_init_sysctl(struct net *net)
3682 {
3683         int idx;
3684         struct netns_ipvs *ipvs = net_ipvs(net);
3685         struct ctl_table *tbl;
3686 
3687         atomic_set(&ipvs->dropentry, 0);
3688         spin_lock_init(&ipvs->dropentry_lock);
3689         spin_lock_init(&ipvs->droppacket_lock);
3690         spin_lock_init(&ipvs->securetcp_lock);
3691 
3692         if (!net_eq(net, &init_net)) {
3693                 tbl = kmemdup(vs_vars, sizeof(vs_vars), GFP_KERNEL);
3694                 if (tbl == NULL)
3695                         return -ENOMEM;
3696 
3697                 /* Don't export sysctls to unprivileged users */
3698                 if (net->user_ns != &init_user_ns)
3699                         tbl[0].procname = NULL;
3700         } else
3701                 tbl = vs_vars;
3702         /* Initialize sysctl defaults */
3703         idx = 0;
3704         ipvs->sysctl_amemthresh = 1024;
3705         tbl[idx++].data = &ipvs->sysctl_amemthresh;
3706         ipvs->sysctl_am_droprate = 10;
3707         tbl[idx++].data = &ipvs->sysctl_am_droprate;
3708         tbl[idx++].data = &ipvs->sysctl_drop_entry;
3709         tbl[idx++].data = &ipvs->sysctl_drop_packet;
3710 #ifdef CONFIG_IP_VS_NFCT
3711         tbl[idx++].data = &ipvs->sysctl_conntrack;
3712 #endif
3713         tbl[idx++].data = &ipvs->sysctl_secure_tcp;
3714         ipvs->sysctl_snat_reroute = 1;
3715         tbl[idx++].data = &ipvs->sysctl_snat_reroute;
3716         ipvs->sysctl_sync_ver = 1;
3717         tbl[idx++].data = &ipvs->sysctl_sync_ver;
3718         ipvs->sysctl_sync_ports = 1;
3719         tbl[idx++].data = &ipvs->sysctl_sync_ports;
3720         ipvs->sysctl_sync_qlen_max = nr_free_buffer_pages() / 32;
3721         tbl[idx++].data = &ipvs->sysctl_sync_qlen_max;
3722         ipvs->sysctl_sync_sock_size = 0;
3723         tbl[idx++].data = &ipvs->sysctl_sync_sock_size;
3724         tbl[idx++].data = &ipvs->sysctl_cache_bypass;
3725         tbl[idx++].data = &ipvs->sysctl_expire_nodest_conn;
3726         tbl[idx++].data = &ipvs->sysctl_expire_quiescent_template;
3727         ipvs->sysctl_sync_threshold[0] = DEFAULT_SYNC_THRESHOLD;
3728         ipvs->sysctl_sync_threshold[1] = DEFAULT_SYNC_PERIOD;
3729         tbl[idx].data = &ipvs->sysctl_sync_threshold;
3730         tbl[idx++].maxlen = sizeof(ipvs->sysctl_sync_threshold);
3731         ipvs->sysctl_sync_refresh_period = DEFAULT_SYNC_REFRESH_PERIOD;
3732         tbl[idx++].data = &ipvs->sysctl_sync_refresh_period;
3733         ipvs->sysctl_sync_retries = clamp_t(int, DEFAULT_SYNC_RETRIES, 0, 3);
3734         tbl[idx++].data = &ipvs->sysctl_sync_retries;
3735         tbl[idx++].data = &ipvs->sysctl_nat_icmp_send;
3736         ipvs->sysctl_pmtu_disc = 1;
3737         tbl[idx++].data = &ipvs->sysctl_pmtu_disc;
3738         tbl[idx++].data = &ipvs->sysctl_backup_only;
3739 
3740 
3741         ipvs->sysctl_hdr = register_net_sysctl(net, "net/ipv4/vs", tbl);
3742         if (ipvs->sysctl_hdr == NULL) {
3743                 if (!net_eq(net, &init_net))
3744                         kfree(tbl);
3745                 return -ENOMEM;
3746         }
3747         ip_vs_start_estimator(net, &ipvs->tot_stats);
3748         ipvs->sysctl_tbl = tbl;
3749         /* Schedule defense work */
3750         INIT_DELAYED_WORK(&ipvs->defense_work, defense_work_handler);
3751         schedule_delayed_work(&ipvs->defense_work, DEFENSE_TIMER_PERIOD);
3752 
3753         return 0;
3754 }
3755 
3756 static void __net_exit ip_vs_control_net_cleanup_sysctl(struct net *net)
3757 {
3758         struct netns_ipvs *ipvs = net_ipvs(net);
3759 
3760         cancel_delayed_work_sync(&ipvs->defense_work);
3761         cancel_work_sync(&ipvs->defense_work.work);
3762         unregister_net_sysctl_table(ipvs->sysctl_hdr);
3763 }
3764 
3765 #else
3766 
3767 static int __net_init ip_vs_control_net_init_sysctl(struct net *net) { return 0; }
3768 static void __net_exit ip_vs_control_net_cleanup_sysctl(struct net *net) { }
3769 
3770 #endif
3771 
3772 static struct notifier_block ip_vs_dst_notifier = {
3773         .notifier_call = ip_vs_dst_event,
3774 };
3775 
3776 int __net_init ip_vs_control_net_init(struct net *net)
3777 {
3778         int idx;
3779         struct netns_ipvs *ipvs = net_ipvs(net);
3780 
3781         /* Initialize rs_table */
3782         for (idx = 0; idx < IP_VS_RTAB_SIZE; idx++)
3783                 INIT_HLIST_HEAD(&ipvs->rs_table[idx]);
3784 
3785         INIT_LIST_HEAD(&ipvs->dest_trash);
3786         spin_lock_init(&ipvs->dest_trash_lock);
3787         setup_timer(&ipvs->dest_trash_timer, ip_vs_dest_trash_expire,
3788                     (unsigned long) net);
3789         atomic_set(&ipvs->ftpsvc_counter, 0);
3790         atomic_set(&ipvs->nullsvc_counter, 0);
3791 
3792         /* procfs stats */
3793         ipvs->tot_stats.cpustats = alloc_percpu(struct ip_vs_cpu_stats);
3794         if (!ipvs->tot_stats.cpustats)
3795                 return -ENOMEM;
3796 
3797         spin_lock_init(&ipvs->tot_stats.lock);
3798 
3799         proc_create("ip_vs", 0, net->proc_net, &ip_vs_info_fops);
3800         proc_create("ip_vs_stats", 0, net->proc_net, &ip_vs_stats_fops);
3801         proc_create("ip_vs_stats_percpu", 0, net->proc_net,
3802                     &ip_vs_stats_percpu_fops);
3803 
3804         if (ip_vs_control_net_init_sysctl(net))
3805                 goto err;
3806 
3807         return 0;
3808 
3809 err:
3810         free_percpu(ipvs->tot_stats.cpustats);
3811         return -ENOMEM;
3812 }
3813 
3814 void __net_exit ip_vs_control_net_cleanup(struct net *net)
3815 {
3816         struct netns_ipvs *ipvs = net_ipvs(net);
3817 
3818         /* Some dest can be in grace period even before cleanup, we have to
3819          * defer ip_vs_trash_cleanup until ip_vs_dest_wait_readers is called.
3820          */
3821         rcu_barrier();
3822         ip_vs_trash_cleanup(net);
3823         ip_vs_stop_estimator(net, &ipvs->tot_stats);
3824         ip_vs_control_net_cleanup_sysctl(net);
3825         remove_proc_entry("ip_vs_stats_percpu", net->proc_net);
3826         remove_proc_entry("ip_vs_stats", net->proc_net);
3827         remove_proc_entry("ip_vs", net->proc_net);
3828         free_percpu(ipvs->tot_stats.cpustats);
3829 }
3830 
3831 int __init ip_vs_register_nl_ioctl(void)
3832 {
3833         int ret;
3834 
3835         ret = nf_register_sockopt(&ip_vs_sockopts);
3836         if (ret) {
3837                 pr_err("cannot register sockopt.\n");
3838                 goto err_sock;
3839         }
3840 
3841         ret = ip_vs_genl_register();
3842         if (ret) {
3843                 pr_err("cannot register Generic Netlink interface.\n");
3844                 goto err_genl;
3845         }
3846         return 0;
3847 
3848 err_genl:
3849         nf_unregister_sockopt(&ip_vs_sockopts);
3850 err_sock:
3851         return ret;
3852 }
3853 
3854 void ip_vs_unregister_nl_ioctl(void)
3855 {
3856         ip_vs_genl_unregister();
3857         nf_unregister_sockopt(&ip_vs_sockopts);
3858 }
3859 
3860 int __init ip_vs_control_init(void)
3861 {
3862         int idx;
3863         int ret;
3864 
3865         EnterFunction(2);
3866 
3867         /* Initialize svc_table, ip_vs_svc_fwm_table */
3868         for (idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
3869                 INIT_HLIST_HEAD(&ip_vs_svc_table[idx]);
3870                 INIT_HLIST_HEAD(&ip_vs_svc_fwm_table[idx]);
3871         }
3872 
3873         smp_wmb();      /* Do we really need it now ? */
3874 
3875         ret = register_netdevice_notifier(&ip_vs_dst_notifier);
3876         if (ret < 0)
3877                 return ret;
3878 
3879         LeaveFunction(2);
3880         return 0;
3881 }
3882 
3883 
3884 void ip_vs_control_cleanup(void)
3885 {
3886         EnterFunction(2);
3887         unregister_netdevice_notifier(&ip_vs_dst_notifier);
3888         LeaveFunction(2);
3889 }
3890 

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