~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/net/netfilter/ipvs/ip_vs_ctl.c

Version: ~ [ linux-6.1-rc7 ] ~ [ linux-6.0.10 ] ~ [ linux-5.19.17 ] ~ [ linux-5.18.19 ] ~ [ linux-5.17.15 ] ~ [ linux-5.16.20 ] ~ [ linux-5.15.80 ] ~ [ linux-5.14.21 ] ~ [ linux-5.13.19 ] ~ [ linux-5.12.19 ] ~ [ linux-5.11.22 ] ~ [ linux-5.10.156 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.225 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.267 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.300 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.334 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.302 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.9 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 // SPDX-License-Identifier: GPL-2.0-or-later
  2 /*
  3  * IPVS         An implementation of the IP virtual server support for the
  4  *              LINUX operating system.  IPVS is now implemented as a module
  5  *              over the NetFilter framework. IPVS can be used to build a
  6  *              high-performance and highly available server based on a
  7  *              cluster of servers.
  8  *
  9  * Authors:     Wensong Zhang <wensong@linuxvirtualserver.org>
 10  *              Peter Kese <peter.kese@ijs.si>
 11  *              Julian Anastasov <ja@ssi.bg>
 12  *
 13  * Changes:
 14  */
 15 
 16 #define KMSG_COMPONENT "IPVS"
 17 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
 18 
 19 #include <linux/module.h>
 20 #include <linux/init.h>
 21 #include <linux/types.h>
 22 #include <linux/capability.h>
 23 #include <linux/fs.h>
 24 #include <linux/sysctl.h>
 25 #include <linux/proc_fs.h>
 26 #include <linux/workqueue.h>
 27 #include <linux/swap.h>
 28 #include <linux/seq_file.h>
 29 #include <linux/slab.h>
 30 
 31 #include <linux/netfilter.h>
 32 #include <linux/netfilter_ipv4.h>
 33 #include <linux/mutex.h>
 34 
 35 #include <net/net_namespace.h>
 36 #include <linux/nsproxy.h>
 37 #include <net/ip.h>
 38 #ifdef CONFIG_IP_VS_IPV6
 39 #include <net/ipv6.h>
 40 #include <net/ip6_route.h>
 41 #include <net/netfilter/ipv6/nf_defrag_ipv6.h>
 42 #endif
 43 #include <net/route.h>
 44 #include <net/sock.h>
 45 #include <net/genetlink.h>
 46 
 47 #include <linux/uaccess.h>
 48 
 49 #include <net/ip_vs.h>
 50 
 51 /* semaphore for IPVS sockopts. And, [gs]etsockopt may sleep. */
 52 static DEFINE_MUTEX(__ip_vs_mutex);
 53 
 54 /* sysctl variables */
 55 
 56 #ifdef CONFIG_IP_VS_DEBUG
 57 static int sysctl_ip_vs_debug_level = 0;
 58 
 59 int ip_vs_get_debug_level(void)
 60 {
 61         return sysctl_ip_vs_debug_level;
 62 }
 63 #endif
 64 
 65 
 66 /*  Protos */
 67 static void __ip_vs_del_service(struct ip_vs_service *svc, bool cleanup);
 68 
 69 
 70 #ifdef CONFIG_IP_VS_IPV6
 71 /* Taken from rt6_fill_node() in net/ipv6/route.c, is there a better way? */
 72 static bool __ip_vs_addr_is_local_v6(struct net *net,
 73                                      const struct in6_addr *addr)
 74 {
 75         struct flowi6 fl6 = {
 76                 .daddr = *addr,
 77         };
 78         struct dst_entry *dst = ip6_route_output(net, NULL, &fl6);
 79         bool is_local;
 80 
 81         is_local = !dst->error && dst->dev && (dst->dev->flags & IFF_LOOPBACK);
 82 
 83         dst_release(dst);
 84         return is_local;
 85 }
 86 #endif
 87 
 88 #ifdef CONFIG_SYSCTL
 89 /*
 90  *      update_defense_level is called from keventd and from sysctl,
 91  *      so it needs to protect itself from softirqs
 92  */
 93 static void update_defense_level(struct netns_ipvs *ipvs)
 94 {
 95         struct sysinfo i;
 96         int availmem;
 97         int nomem;
 98         int to_change = -1;
 99 
100         /* we only count free and buffered memory (in pages) */
101         si_meminfo(&i);
102         availmem = i.freeram + i.bufferram;
103         /* however in linux 2.5 the i.bufferram is total page cache size,
104            we need adjust it */
105         /* si_swapinfo(&i); */
106         /* availmem = availmem - (i.totalswap - i.freeswap); */
107 
108         nomem = (availmem < ipvs->sysctl_amemthresh);
109 
110         local_bh_disable();
111 
112         /* drop_entry */
113         spin_lock(&ipvs->dropentry_lock);
114         switch (ipvs->sysctl_drop_entry) {
115         case 0:
116                 atomic_set(&ipvs->dropentry, 0);
117                 break;
118         case 1:
119                 if (nomem) {
120                         atomic_set(&ipvs->dropentry, 1);
121                         ipvs->sysctl_drop_entry = 2;
122                 } else {
123                         atomic_set(&ipvs->dropentry, 0);
124                 }
125                 break;
126         case 2:
127                 if (nomem) {
128                         atomic_set(&ipvs->dropentry, 1);
129                 } else {
130                         atomic_set(&ipvs->dropentry, 0);
131                         ipvs->sysctl_drop_entry = 1;
132                 }
133                 break;
134         case 3:
135                 atomic_set(&ipvs->dropentry, 1);
136                 break;
137         }
138         spin_unlock(&ipvs->dropentry_lock);
139 
140         /* drop_packet */
141         spin_lock(&ipvs->droppacket_lock);
142         switch (ipvs->sysctl_drop_packet) {
143         case 0:
144                 ipvs->drop_rate = 0;
145                 break;
146         case 1:
147                 if (nomem) {
148                         ipvs->drop_rate = ipvs->drop_counter
149                                 = ipvs->sysctl_amemthresh /
150                                 (ipvs->sysctl_amemthresh-availmem);
151                         ipvs->sysctl_drop_packet = 2;
152                 } else {
153                         ipvs->drop_rate = 0;
154                 }
155                 break;
156         case 2:
157                 if (nomem) {
158                         ipvs->drop_rate = ipvs->drop_counter
159                                 = ipvs->sysctl_amemthresh /
160                                 (ipvs->sysctl_amemthresh-availmem);
161                 } else {
162                         ipvs->drop_rate = 0;
163                         ipvs->sysctl_drop_packet = 1;
164                 }
165                 break;
166         case 3:
167                 ipvs->drop_rate = ipvs->sysctl_am_droprate;
168                 break;
169         }
170         spin_unlock(&ipvs->droppacket_lock);
171 
172         /* secure_tcp */
173         spin_lock(&ipvs->securetcp_lock);
174         switch (ipvs->sysctl_secure_tcp) {
175         case 0:
176                 if (ipvs->old_secure_tcp >= 2)
177                         to_change = 0;
178                 break;
179         case 1:
180                 if (nomem) {
181                         if (ipvs->old_secure_tcp < 2)
182                                 to_change = 1;
183                         ipvs->sysctl_secure_tcp = 2;
184                 } else {
185                         if (ipvs->old_secure_tcp >= 2)
186                                 to_change = 0;
187                 }
188                 break;
189         case 2:
190                 if (nomem) {
191                         if (ipvs->old_secure_tcp < 2)
192                                 to_change = 1;
193                 } else {
194                         if (ipvs->old_secure_tcp >= 2)
195                                 to_change = 0;
196                         ipvs->sysctl_secure_tcp = 1;
197                 }
198                 break;
199         case 3:
200                 if (ipvs->old_secure_tcp < 2)
201                         to_change = 1;
202                 break;
203         }
204         ipvs->old_secure_tcp = ipvs->sysctl_secure_tcp;
205         if (to_change >= 0)
206                 ip_vs_protocol_timeout_change(ipvs,
207                                               ipvs->sysctl_secure_tcp > 1);
208         spin_unlock(&ipvs->securetcp_lock);
209 
210         local_bh_enable();
211 }
212 
213 
214 /*
215  *      Timer for checking the defense
216  */
217 #define DEFENSE_TIMER_PERIOD    1*HZ
218 
219 static void defense_work_handler(struct work_struct *work)
220 {
221         struct netns_ipvs *ipvs =
222                 container_of(work, struct netns_ipvs, defense_work.work);
223 
224         update_defense_level(ipvs);
225         if (atomic_read(&ipvs->dropentry))
226                 ip_vs_random_dropentry(ipvs);
227         schedule_delayed_work(&ipvs->defense_work, DEFENSE_TIMER_PERIOD);
228 }
229 #endif
230 
231 int
232 ip_vs_use_count_inc(void)
233 {
234         return try_module_get(THIS_MODULE);
235 }
236 
237 void
238 ip_vs_use_count_dec(void)
239 {
240         module_put(THIS_MODULE);
241 }
242 
243 
244 /*
245  *      Hash table: for virtual service lookups
246  */
247 #define IP_VS_SVC_TAB_BITS 8
248 #define IP_VS_SVC_TAB_SIZE (1 << IP_VS_SVC_TAB_BITS)
249 #define IP_VS_SVC_TAB_MASK (IP_VS_SVC_TAB_SIZE - 1)
250 
251 /* the service table hashed by <protocol, addr, port> */
252 static struct hlist_head ip_vs_svc_table[IP_VS_SVC_TAB_SIZE];
253 /* the service table hashed by fwmark */
254 static struct hlist_head ip_vs_svc_fwm_table[IP_VS_SVC_TAB_SIZE];
255 
256 
257 /*
258  *      Returns hash value for virtual service
259  */
260 static inline unsigned int
261 ip_vs_svc_hashkey(struct netns_ipvs *ipvs, int af, unsigned int proto,
262                   const union nf_inet_addr *addr, __be16 port)
263 {
264         unsigned int porth = ntohs(port);
265         __be32 addr_fold = addr->ip;
266         __u32 ahash;
267 
268 #ifdef CONFIG_IP_VS_IPV6
269         if (af == AF_INET6)
270                 addr_fold = addr->ip6[0]^addr->ip6[1]^
271                             addr->ip6[2]^addr->ip6[3];
272 #endif
273         ahash = ntohl(addr_fold);
274         ahash ^= ((size_t) ipvs >> 8);
275 
276         return (proto ^ ahash ^ (porth >> IP_VS_SVC_TAB_BITS) ^ porth) &
277                IP_VS_SVC_TAB_MASK;
278 }
279 
280 /*
281  *      Returns hash value of fwmark for virtual service lookup
282  */
283 static inline unsigned int ip_vs_svc_fwm_hashkey(struct netns_ipvs *ipvs, __u32 fwmark)
284 {
285         return (((size_t)ipvs>>8) ^ fwmark) & IP_VS_SVC_TAB_MASK;
286 }
287 
288 /*
289  *      Hashes a service in the ip_vs_svc_table by <netns,proto,addr,port>
290  *      or in the ip_vs_svc_fwm_table by fwmark.
291  *      Should be called with locked tables.
292  */
293 static int ip_vs_svc_hash(struct ip_vs_service *svc)
294 {
295         unsigned int hash;
296 
297         if (svc->flags & IP_VS_SVC_F_HASHED) {
298                 pr_err("%s(): request for already hashed, called from %pS\n",
299                        __func__, __builtin_return_address(0));
300                 return 0;
301         }
302 
303         if (svc->fwmark == 0) {
304                 /*
305                  *  Hash it by <netns,protocol,addr,port> in ip_vs_svc_table
306                  */
307                 hash = ip_vs_svc_hashkey(svc->ipvs, svc->af, svc->protocol,
308                                          &svc->addr, svc->port);
309                 hlist_add_head_rcu(&svc->s_list, &ip_vs_svc_table[hash]);
310         } else {
311                 /*
312                  *  Hash it by fwmark in svc_fwm_table
313                  */
314                 hash = ip_vs_svc_fwm_hashkey(svc->ipvs, svc->fwmark);
315                 hlist_add_head_rcu(&svc->f_list, &ip_vs_svc_fwm_table[hash]);
316         }
317 
318         svc->flags |= IP_VS_SVC_F_HASHED;
319         /* increase its refcnt because it is referenced by the svc table */
320         atomic_inc(&svc->refcnt);
321         return 1;
322 }
323 
324 
325 /*
326  *      Unhashes a service from svc_table / svc_fwm_table.
327  *      Should be called with locked tables.
328  */
329 static int ip_vs_svc_unhash(struct ip_vs_service *svc)
330 {
331         if (!(svc->flags & IP_VS_SVC_F_HASHED)) {
332                 pr_err("%s(): request for unhash flagged, called from %pS\n",
333                        __func__, __builtin_return_address(0));
334                 return 0;
335         }
336 
337         if (svc->fwmark == 0) {
338                 /* Remove it from the svc_table table */
339                 hlist_del_rcu(&svc->s_list);
340         } else {
341                 /* Remove it from the svc_fwm_table table */
342                 hlist_del_rcu(&svc->f_list);
343         }
344 
345         svc->flags &= ~IP_VS_SVC_F_HASHED;
346         atomic_dec(&svc->refcnt);
347         return 1;
348 }
349 
350 
351 /*
352  *      Get service by {netns, proto,addr,port} in the service table.
353  */
354 static inline struct ip_vs_service *
355 __ip_vs_service_find(struct netns_ipvs *ipvs, int af, __u16 protocol,
356                      const union nf_inet_addr *vaddr, __be16 vport)
357 {
358         unsigned int hash;
359         struct ip_vs_service *svc;
360 
361         /* Check for "full" addressed entries */
362         hash = ip_vs_svc_hashkey(ipvs, af, protocol, vaddr, vport);
363 
364         hlist_for_each_entry_rcu(svc, &ip_vs_svc_table[hash], s_list) {
365                 if ((svc->af == af)
366                     && ip_vs_addr_equal(af, &svc->addr, vaddr)
367                     && (svc->port == vport)
368                     && (svc->protocol == protocol)
369                     && (svc->ipvs == ipvs)) {
370                         /* HIT */
371                         return svc;
372                 }
373         }
374 
375         return NULL;
376 }
377 
378 
379 /*
380  *      Get service by {fwmark} in the service table.
381  */
382 static inline struct ip_vs_service *
383 __ip_vs_svc_fwm_find(struct netns_ipvs *ipvs, int af, __u32 fwmark)
384 {
385         unsigned int hash;
386         struct ip_vs_service *svc;
387 
388         /* Check for fwmark addressed entries */
389         hash = ip_vs_svc_fwm_hashkey(ipvs, fwmark);
390 
391         hlist_for_each_entry_rcu(svc, &ip_vs_svc_fwm_table[hash], f_list) {
392                 if (svc->fwmark == fwmark && svc->af == af
393                     && (svc->ipvs == ipvs)) {
394                         /* HIT */
395                         return svc;
396                 }
397         }
398 
399         return NULL;
400 }
401 
402 /* Find service, called under RCU lock */
403 struct ip_vs_service *
404 ip_vs_service_find(struct netns_ipvs *ipvs, int af, __u32 fwmark, __u16 protocol,
405                    const union nf_inet_addr *vaddr, __be16 vport)
406 {
407         struct ip_vs_service *svc;
408 
409         /*
410          *      Check the table hashed by fwmark first
411          */
412         if (fwmark) {
413                 svc = __ip_vs_svc_fwm_find(ipvs, af, fwmark);
414                 if (svc)
415                         goto out;
416         }
417 
418         /*
419          *      Check the table hashed by <protocol,addr,port>
420          *      for "full" addressed entries
421          */
422         svc = __ip_vs_service_find(ipvs, af, protocol, vaddr, vport);
423 
424         if (!svc && protocol == IPPROTO_TCP &&
425             atomic_read(&ipvs->ftpsvc_counter) &&
426             (vport == FTPDATA || !inet_port_requires_bind_service(ipvs->net, ntohs(vport)))) {
427                 /*
428                  * Check if ftp service entry exists, the packet
429                  * might belong to FTP data connections.
430                  */
431                 svc = __ip_vs_service_find(ipvs, af, protocol, vaddr, FTPPORT);
432         }
433 
434         if (svc == NULL
435             && atomic_read(&ipvs->nullsvc_counter)) {
436                 /*
437                  * Check if the catch-all port (port zero) exists
438                  */
439                 svc = __ip_vs_service_find(ipvs, af, protocol, vaddr, 0);
440         }
441 
442   out:
443         IP_VS_DBG_BUF(9, "lookup service: fwm %u %s %s:%u %s\n",
444                       fwmark, ip_vs_proto_name(protocol),
445                       IP_VS_DBG_ADDR(af, vaddr), ntohs(vport),
446                       svc ? "hit" : "not hit");
447 
448         return svc;
449 }
450 
451 
452 static inline void
453 __ip_vs_bind_svc(struct ip_vs_dest *dest, struct ip_vs_service *svc)
454 {
455         atomic_inc(&svc->refcnt);
456         rcu_assign_pointer(dest->svc, svc);
457 }
458 
459 static void ip_vs_service_free(struct ip_vs_service *svc)
460 {
461         free_percpu(svc->stats.cpustats);
462         kfree(svc);
463 }
464 
465 static void ip_vs_service_rcu_free(struct rcu_head *head)
466 {
467         struct ip_vs_service *svc;
468 
469         svc = container_of(head, struct ip_vs_service, rcu_head);
470         ip_vs_service_free(svc);
471 }
472 
473 static void __ip_vs_svc_put(struct ip_vs_service *svc, bool do_delay)
474 {
475         if (atomic_dec_and_test(&svc->refcnt)) {
476                 IP_VS_DBG_BUF(3, "Removing service %u/%s:%u\n",
477                               svc->fwmark,
478                               IP_VS_DBG_ADDR(svc->af, &svc->addr),
479                               ntohs(svc->port));
480                 if (do_delay)
481                         call_rcu(&svc->rcu_head, ip_vs_service_rcu_free);
482                 else
483                         ip_vs_service_free(svc);
484         }
485 }
486 
487 
488 /*
489  *      Returns hash value for real service
490  */
491 static inline unsigned int ip_vs_rs_hashkey(int af,
492                                             const union nf_inet_addr *addr,
493                                             __be16 port)
494 {
495         unsigned int porth = ntohs(port);
496         __be32 addr_fold = addr->ip;
497 
498 #ifdef CONFIG_IP_VS_IPV6
499         if (af == AF_INET6)
500                 addr_fold = addr->ip6[0]^addr->ip6[1]^
501                             addr->ip6[2]^addr->ip6[3];
502 #endif
503 
504         return (ntohl(addr_fold)^(porth>>IP_VS_RTAB_BITS)^porth)
505                 & IP_VS_RTAB_MASK;
506 }
507 
508 /* Hash ip_vs_dest in rs_table by <proto,addr,port>. */
509 static void ip_vs_rs_hash(struct netns_ipvs *ipvs, struct ip_vs_dest *dest)
510 {
511         unsigned int hash;
512         __be16 port;
513 
514         if (dest->in_rs_table)
515                 return;
516 
517         switch (IP_VS_DFWD_METHOD(dest)) {
518         case IP_VS_CONN_F_MASQ:
519                 port = dest->port;
520                 break;
521         case IP_VS_CONN_F_TUNNEL:
522                 switch (dest->tun_type) {
523                 case IP_VS_CONN_F_TUNNEL_TYPE_GUE:
524                         port = dest->tun_port;
525                         break;
526                 case IP_VS_CONN_F_TUNNEL_TYPE_IPIP:
527                 case IP_VS_CONN_F_TUNNEL_TYPE_GRE:
528                         port = 0;
529                         break;
530                 default:
531                         return;
532                 }
533                 break;
534         default:
535                 return;
536         }
537 
538         /*
539          *      Hash by proto,addr,port,
540          *      which are the parameters of the real service.
541          */
542         hash = ip_vs_rs_hashkey(dest->af, &dest->addr, port);
543 
544         hlist_add_head_rcu(&dest->d_list, &ipvs->rs_table[hash]);
545         dest->in_rs_table = 1;
546 }
547 
548 /* Unhash ip_vs_dest from rs_table. */
549 static void ip_vs_rs_unhash(struct ip_vs_dest *dest)
550 {
551         /*
552          * Remove it from the rs_table table.
553          */
554         if (dest->in_rs_table) {
555                 hlist_del_rcu(&dest->d_list);
556                 dest->in_rs_table = 0;
557         }
558 }
559 
560 /* Check if real service by <proto,addr,port> is present */
561 bool ip_vs_has_real_service(struct netns_ipvs *ipvs, int af, __u16 protocol,
562                             const union nf_inet_addr *daddr, __be16 dport)
563 {
564         unsigned int hash;
565         struct ip_vs_dest *dest;
566 
567         /* Check for "full" addressed entries */
568         hash = ip_vs_rs_hashkey(af, daddr, dport);
569 
570         hlist_for_each_entry_rcu(dest, &ipvs->rs_table[hash], d_list) {
571                 if (dest->port == dport &&
572                     dest->af == af &&
573                     ip_vs_addr_equal(af, &dest->addr, daddr) &&
574                     (dest->protocol == protocol || dest->vfwmark) &&
575                     IP_VS_DFWD_METHOD(dest) == IP_VS_CONN_F_MASQ) {
576                         /* HIT */
577                         return true;
578                 }
579         }
580 
581         return false;
582 }
583 
584 /* Find real service record by <proto,addr,port>.
585  * In case of multiple records with the same <proto,addr,port>, only
586  * the first found record is returned.
587  *
588  * To be called under RCU lock.
589  */
590 struct ip_vs_dest *ip_vs_find_real_service(struct netns_ipvs *ipvs, int af,
591                                            __u16 protocol,
592                                            const union nf_inet_addr *daddr,
593                                            __be16 dport)
594 {
595         unsigned int hash;
596         struct ip_vs_dest *dest;
597 
598         /* Check for "full" addressed entries */
599         hash = ip_vs_rs_hashkey(af, daddr, dport);
600 
601         hlist_for_each_entry_rcu(dest, &ipvs->rs_table[hash], d_list) {
602                 if (dest->port == dport &&
603                     dest->af == af &&
604                     ip_vs_addr_equal(af, &dest->addr, daddr) &&
605                     (dest->protocol == protocol || dest->vfwmark) &&
606                     IP_VS_DFWD_METHOD(dest) == IP_VS_CONN_F_MASQ) {
607                         /* HIT */
608                         return dest;
609                 }
610         }
611 
612         return NULL;
613 }
614 
615 /* Find real service record by <af,addr,tun_port>.
616  * In case of multiple records with the same <af,addr,tun_port>, only
617  * the first found record is returned.
618  *
619  * To be called under RCU lock.
620  */
621 struct ip_vs_dest *ip_vs_find_tunnel(struct netns_ipvs *ipvs, int af,
622                                      const union nf_inet_addr *daddr,
623                                      __be16 tun_port)
624 {
625         struct ip_vs_dest *dest;
626         unsigned int hash;
627 
628         /* Check for "full" addressed entries */
629         hash = ip_vs_rs_hashkey(af, daddr, tun_port);
630 
631         hlist_for_each_entry_rcu(dest, &ipvs->rs_table[hash], d_list) {
632                 if (dest->tun_port == tun_port &&
633                     dest->af == af &&
634                     ip_vs_addr_equal(af, &dest->addr, daddr) &&
635                     IP_VS_DFWD_METHOD(dest) == IP_VS_CONN_F_TUNNEL) {
636                         /* HIT */
637                         return dest;
638                 }
639         }
640 
641         return NULL;
642 }
643 
644 /* Lookup destination by {addr,port} in the given service
645  * Called under RCU lock.
646  */
647 static struct ip_vs_dest *
648 ip_vs_lookup_dest(struct ip_vs_service *svc, int dest_af,
649                   const union nf_inet_addr *daddr, __be16 dport)
650 {
651         struct ip_vs_dest *dest;
652 
653         /*
654          * Find the destination for the given service
655          */
656         list_for_each_entry_rcu(dest, &svc->destinations, n_list) {
657                 if ((dest->af == dest_af) &&
658                     ip_vs_addr_equal(dest_af, &dest->addr, daddr) &&
659                     (dest->port == dport)) {
660                         /* HIT */
661                         return dest;
662                 }
663         }
664 
665         return NULL;
666 }
667 
668 /*
669  * Find destination by {daddr,dport,vaddr,protocol}
670  * Created to be used in ip_vs_process_message() in
671  * the backup synchronization daemon. It finds the
672  * destination to be bound to the received connection
673  * on the backup.
674  * Called under RCU lock, no refcnt is returned.
675  */
676 struct ip_vs_dest *ip_vs_find_dest(struct netns_ipvs *ipvs, int svc_af, int dest_af,
677                                    const union nf_inet_addr *daddr,
678                                    __be16 dport,
679                                    const union nf_inet_addr *vaddr,
680                                    __be16 vport, __u16 protocol, __u32 fwmark,
681                                    __u32 flags)
682 {
683         struct ip_vs_dest *dest;
684         struct ip_vs_service *svc;
685         __be16 port = dport;
686 
687         svc = ip_vs_service_find(ipvs, svc_af, fwmark, protocol, vaddr, vport);
688         if (!svc)
689                 return NULL;
690         if (fwmark && (flags & IP_VS_CONN_F_FWD_MASK) != IP_VS_CONN_F_MASQ)
691                 port = 0;
692         dest = ip_vs_lookup_dest(svc, dest_af, daddr, port);
693         if (!dest)
694                 dest = ip_vs_lookup_dest(svc, dest_af, daddr, port ^ dport);
695         return dest;
696 }
697 
698 void ip_vs_dest_dst_rcu_free(struct rcu_head *head)
699 {
700         struct ip_vs_dest_dst *dest_dst = container_of(head,
701                                                        struct ip_vs_dest_dst,
702                                                        rcu_head);
703 
704         dst_release(dest_dst->dst_cache);
705         kfree(dest_dst);
706 }
707 
708 /* Release dest_dst and dst_cache for dest in user context */
709 static void __ip_vs_dst_cache_reset(struct ip_vs_dest *dest)
710 {
711         struct ip_vs_dest_dst *old;
712 
713         old = rcu_dereference_protected(dest->dest_dst, 1);
714         if (old) {
715                 RCU_INIT_POINTER(dest->dest_dst, NULL);
716                 call_rcu(&old->rcu_head, ip_vs_dest_dst_rcu_free);
717         }
718 }
719 
720 /*
721  *  Lookup dest by {svc,addr,port} in the destination trash.
722  *  The destination trash is used to hold the destinations that are removed
723  *  from the service table but are still referenced by some conn entries.
724  *  The reason to add the destination trash is when the dest is temporary
725  *  down (either by administrator or by monitor program), the dest can be
726  *  picked back from the trash, the remaining connections to the dest can
727  *  continue, and the counting information of the dest is also useful for
728  *  scheduling.
729  */
730 static struct ip_vs_dest *
731 ip_vs_trash_get_dest(struct ip_vs_service *svc, int dest_af,
732                      const union nf_inet_addr *daddr, __be16 dport)
733 {
734         struct ip_vs_dest *dest;
735         struct netns_ipvs *ipvs = svc->ipvs;
736 
737         /*
738          * Find the destination in trash
739          */
740         spin_lock_bh(&ipvs->dest_trash_lock);
741         list_for_each_entry(dest, &ipvs->dest_trash, t_list) {
742                 IP_VS_DBG_BUF(3, "Destination %u/%s:%u still in trash, "
743                               "dest->refcnt=%d\n",
744                               dest->vfwmark,
745                               IP_VS_DBG_ADDR(dest->af, &dest->addr),
746                               ntohs(dest->port),
747                               refcount_read(&dest->refcnt));
748                 if (dest->af == dest_af &&
749                     ip_vs_addr_equal(dest_af, &dest->addr, daddr) &&
750                     dest->port == dport &&
751                     dest->vfwmark == svc->fwmark &&
752                     dest->protocol == svc->protocol &&
753                     (svc->fwmark ||
754                      (ip_vs_addr_equal(svc->af, &dest->vaddr, &svc->addr) &&
755                       dest->vport == svc->port))) {
756                         /* HIT */
757                         list_del(&dest->t_list);
758                         goto out;
759                 }
760         }
761 
762         dest = NULL;
763 
764 out:
765         spin_unlock_bh(&ipvs->dest_trash_lock);
766 
767         return dest;
768 }
769 
770 static void ip_vs_dest_free(struct ip_vs_dest *dest)
771 {
772         struct ip_vs_service *svc = rcu_dereference_protected(dest->svc, 1);
773 
774         __ip_vs_dst_cache_reset(dest);
775         __ip_vs_svc_put(svc, false);
776         free_percpu(dest->stats.cpustats);
777         ip_vs_dest_put_and_free(dest);
778 }
779 
780 /*
781  *  Clean up all the destinations in the trash
782  *  Called by the ip_vs_control_cleanup()
783  *
784  *  When the ip_vs_control_clearup is activated by ipvs module exit,
785  *  the service tables must have been flushed and all the connections
786  *  are expired, and the refcnt of each destination in the trash must
787  *  be 1, so we simply release them here.
788  */
789 static void ip_vs_trash_cleanup(struct netns_ipvs *ipvs)
790 {
791         struct ip_vs_dest *dest, *nxt;
792 
793         del_timer_sync(&ipvs->dest_trash_timer);
794         /* No need to use dest_trash_lock */
795         list_for_each_entry_safe(dest, nxt, &ipvs->dest_trash, t_list) {
796                 list_del(&dest->t_list);
797                 ip_vs_dest_free(dest);
798         }
799 }
800 
801 static void
802 ip_vs_copy_stats(struct ip_vs_kstats *dst, struct ip_vs_stats *src)
803 {
804 #define IP_VS_SHOW_STATS_COUNTER(c) dst->c = src->kstats.c - src->kstats0.c
805 
806         spin_lock_bh(&src->lock);
807 
808         IP_VS_SHOW_STATS_COUNTER(conns);
809         IP_VS_SHOW_STATS_COUNTER(inpkts);
810         IP_VS_SHOW_STATS_COUNTER(outpkts);
811         IP_VS_SHOW_STATS_COUNTER(inbytes);
812         IP_VS_SHOW_STATS_COUNTER(outbytes);
813 
814         ip_vs_read_estimator(dst, src);
815 
816         spin_unlock_bh(&src->lock);
817 }
818 
819 static void
820 ip_vs_export_stats_user(struct ip_vs_stats_user *dst, struct ip_vs_kstats *src)
821 {
822         dst->conns = (u32)src->conns;
823         dst->inpkts = (u32)src->inpkts;
824         dst->outpkts = (u32)src->outpkts;
825         dst->inbytes = src->inbytes;
826         dst->outbytes = src->outbytes;
827         dst->cps = (u32)src->cps;
828         dst->inpps = (u32)src->inpps;
829         dst->outpps = (u32)src->outpps;
830         dst->inbps = (u32)src->inbps;
831         dst->outbps = (u32)src->outbps;
832 }
833 
834 static void
835 ip_vs_zero_stats(struct ip_vs_stats *stats)
836 {
837         spin_lock_bh(&stats->lock);
838 
839         /* get current counters as zero point, rates are zeroed */
840 
841 #define IP_VS_ZERO_STATS_COUNTER(c) stats->kstats0.c = stats->kstats.c
842 
843         IP_VS_ZERO_STATS_COUNTER(conns);
844         IP_VS_ZERO_STATS_COUNTER(inpkts);
845         IP_VS_ZERO_STATS_COUNTER(outpkts);
846         IP_VS_ZERO_STATS_COUNTER(inbytes);
847         IP_VS_ZERO_STATS_COUNTER(outbytes);
848 
849         ip_vs_zero_estimator(stats);
850 
851         spin_unlock_bh(&stats->lock);
852 }
853 
854 /*
855  *      Update a destination in the given service
856  */
857 static void
858 __ip_vs_update_dest(struct ip_vs_service *svc, struct ip_vs_dest *dest,
859                     struct ip_vs_dest_user_kern *udest, int add)
860 {
861         struct netns_ipvs *ipvs = svc->ipvs;
862         struct ip_vs_service *old_svc;
863         struct ip_vs_scheduler *sched;
864         int conn_flags;
865 
866         /* We cannot modify an address and change the address family */
867         BUG_ON(!add && udest->af != dest->af);
868 
869         if (add && udest->af != svc->af)
870                 ipvs->mixed_address_family_dests++;
871 
872         /* keep the last_weight with latest non-0 weight */
873         if (add || udest->weight != 0)
874                 atomic_set(&dest->last_weight, udest->weight);
875 
876         /* set the weight and the flags */
877         atomic_set(&dest->weight, udest->weight);
878         conn_flags = udest->conn_flags & IP_VS_CONN_F_DEST_MASK;
879         conn_flags |= IP_VS_CONN_F_INACTIVE;
880 
881         /* Need to rehash? */
882         if ((udest->conn_flags & IP_VS_CONN_F_FWD_MASK) !=
883             IP_VS_DFWD_METHOD(dest) ||
884             udest->tun_type != dest->tun_type ||
885             udest->tun_port != dest->tun_port)
886                 ip_vs_rs_unhash(dest);
887 
888         /* set the tunnel info */
889         dest->tun_type = udest->tun_type;
890         dest->tun_port = udest->tun_port;
891         dest->tun_flags = udest->tun_flags;
892 
893         /* set the IP_VS_CONN_F_NOOUTPUT flag if not masquerading/NAT */
894         if ((conn_flags & IP_VS_CONN_F_FWD_MASK) != IP_VS_CONN_F_MASQ) {
895                 conn_flags |= IP_VS_CONN_F_NOOUTPUT;
896         } else {
897                 /* FTP-NAT requires conntrack for mangling */
898                 if (svc->port == FTPPORT)
899                         ip_vs_register_conntrack(svc);
900         }
901         atomic_set(&dest->conn_flags, conn_flags);
902         /* Put the real service in rs_table if not present. */
903         ip_vs_rs_hash(ipvs, dest);
904 
905         /* bind the service */
906         old_svc = rcu_dereference_protected(dest->svc, 1);
907         if (!old_svc) {
908                 __ip_vs_bind_svc(dest, svc);
909         } else {
910                 if (old_svc != svc) {
911                         ip_vs_zero_stats(&dest->stats);
912                         __ip_vs_bind_svc(dest, svc);
913                         __ip_vs_svc_put(old_svc, true);
914                 }
915         }
916 
917         /* set the dest status flags */
918         dest->flags |= IP_VS_DEST_F_AVAILABLE;
919 
920         if (udest->u_threshold == 0 || udest->u_threshold > dest->u_threshold)
921                 dest->flags &= ~IP_VS_DEST_F_OVERLOAD;
922         dest->u_threshold = udest->u_threshold;
923         dest->l_threshold = udest->l_threshold;
924 
925         dest->af = udest->af;
926 
927         spin_lock_bh(&dest->dst_lock);
928         __ip_vs_dst_cache_reset(dest);
929         spin_unlock_bh(&dest->dst_lock);
930 
931         if (add) {
932                 ip_vs_start_estimator(svc->ipvs, &dest->stats);
933                 list_add_rcu(&dest->n_list, &svc->destinations);
934                 svc->num_dests++;
935                 sched = rcu_dereference_protected(svc->scheduler, 1);
936                 if (sched && sched->add_dest)
937                         sched->add_dest(svc, dest);
938         } else {
939                 sched = rcu_dereference_protected(svc->scheduler, 1);
940                 if (sched && sched->upd_dest)
941                         sched->upd_dest(svc, dest);
942         }
943 }
944 
945 
946 /*
947  *      Create a destination for the given service
948  */
949 static int
950 ip_vs_new_dest(struct ip_vs_service *svc, struct ip_vs_dest_user_kern *udest,
951                struct ip_vs_dest **dest_p)
952 {
953         struct ip_vs_dest *dest;
954         unsigned int atype, i;
955 
956         EnterFunction(2);
957 
958 #ifdef CONFIG_IP_VS_IPV6
959         if (udest->af == AF_INET6) {
960                 int ret;
961 
962                 atype = ipv6_addr_type(&udest->addr.in6);
963                 if ((!(atype & IPV6_ADDR_UNICAST) ||
964                         atype & IPV6_ADDR_LINKLOCAL) &&
965                         !__ip_vs_addr_is_local_v6(svc->ipvs->net, &udest->addr.in6))
966                         return -EINVAL;
967 
968                 ret = nf_defrag_ipv6_enable(svc->ipvs->net);
969                 if (ret)
970                         return ret;
971         } else
972 #endif
973         {
974                 atype = inet_addr_type(svc->ipvs->net, udest->addr.ip);
975                 if (atype != RTN_LOCAL && atype != RTN_UNICAST)
976                         return -EINVAL;
977         }
978 
979         dest = kzalloc(sizeof(struct ip_vs_dest), GFP_KERNEL);
980         if (dest == NULL)
981                 return -ENOMEM;
982 
983         dest->stats.cpustats = alloc_percpu(struct ip_vs_cpu_stats);
984         if (!dest->stats.cpustats)
985                 goto err_alloc;
986 
987         for_each_possible_cpu(i) {
988                 struct ip_vs_cpu_stats *ip_vs_dest_stats;
989                 ip_vs_dest_stats = per_cpu_ptr(dest->stats.cpustats, i);
990                 u64_stats_init(&ip_vs_dest_stats->syncp);
991         }
992 
993         dest->af = udest->af;
994         dest->protocol = svc->protocol;
995         dest->vaddr = svc->addr;
996         dest->vport = svc->port;
997         dest->vfwmark = svc->fwmark;
998         ip_vs_addr_copy(udest->af, &dest->addr, &udest->addr);
999         dest->port = udest->port;
1000 
1001         atomic_set(&dest->activeconns, 0);
1002         atomic_set(&dest->inactconns, 0);
1003         atomic_set(&dest->persistconns, 0);
1004         refcount_set(&dest->refcnt, 1);
1005 
1006         INIT_HLIST_NODE(&dest->d_list);
1007         spin_lock_init(&dest->dst_lock);
1008         spin_lock_init(&dest->stats.lock);
1009         __ip_vs_update_dest(svc, dest, udest, 1);
1010 
1011         *dest_p = dest;
1012 
1013         LeaveFunction(2);
1014         return 0;
1015 
1016 err_alloc:
1017         kfree(dest);
1018         return -ENOMEM;
1019 }
1020 
1021 
1022 /*
1023  *      Add a destination into an existing service
1024  */
1025 static int
1026 ip_vs_add_dest(struct ip_vs_service *svc, struct ip_vs_dest_user_kern *udest)
1027 {
1028         struct ip_vs_dest *dest;
1029         union nf_inet_addr daddr;
1030         __be16 dport = udest->port;
1031         int ret;
1032 
1033         EnterFunction(2);
1034 
1035         if (udest->weight < 0) {
1036                 pr_err("%s(): server weight less than zero\n", __func__);
1037                 return -ERANGE;
1038         }
1039 
1040         if (udest->l_threshold > udest->u_threshold) {
1041                 pr_err("%s(): lower threshold is higher than upper threshold\n",
1042                         __func__);
1043                 return -ERANGE;
1044         }
1045 
1046         if (udest->tun_type == IP_VS_CONN_F_TUNNEL_TYPE_GUE) {
1047                 if (udest->tun_port == 0) {
1048                         pr_err("%s(): tunnel port is zero\n", __func__);
1049                         return -EINVAL;
1050                 }
1051         }
1052 
1053         ip_vs_addr_copy(udest->af, &daddr, &udest->addr);
1054 
1055         /* We use function that requires RCU lock */
1056         rcu_read_lock();
1057         dest = ip_vs_lookup_dest(svc, udest->af, &daddr, dport);
1058         rcu_read_unlock();
1059 
1060         if (dest != NULL) {
1061                 IP_VS_DBG(1, "%s(): dest already exists\n", __func__);
1062                 return -EEXIST;
1063         }
1064 
1065         /*
1066          * Check if the dest already exists in the trash and
1067          * is from the same service
1068          */
1069         dest = ip_vs_trash_get_dest(svc, udest->af, &daddr, dport);
1070 
1071         if (dest != NULL) {
1072                 IP_VS_DBG_BUF(3, "Get destination %s:%u from trash, "
1073                               "dest->refcnt=%d, service %u/%s:%u\n",
1074                               IP_VS_DBG_ADDR(udest->af, &daddr), ntohs(dport),
1075                               refcount_read(&dest->refcnt),
1076                               dest->vfwmark,
1077                               IP_VS_DBG_ADDR(svc->af, &dest->vaddr),
1078                               ntohs(dest->vport));
1079 
1080                 __ip_vs_update_dest(svc, dest, udest, 1);
1081                 ret = 0;
1082         } else {
1083                 /*
1084                  * Allocate and initialize the dest structure
1085                  */
1086                 ret = ip_vs_new_dest(svc, udest, &dest);
1087         }
1088         LeaveFunction(2);
1089 
1090         return ret;
1091 }
1092 
1093 
1094 /*
1095  *      Edit a destination in the given service
1096  */
1097 static int
1098 ip_vs_edit_dest(struct ip_vs_service *svc, struct ip_vs_dest_user_kern *udest)
1099 {
1100         struct ip_vs_dest *dest;
1101         union nf_inet_addr daddr;
1102         __be16 dport = udest->port;
1103 
1104         EnterFunction(2);
1105 
1106         if (udest->weight < 0) {
1107                 pr_err("%s(): server weight less than zero\n", __func__);
1108                 return -ERANGE;
1109         }
1110 
1111         if (udest->l_threshold > udest->u_threshold) {
1112                 pr_err("%s(): lower threshold is higher than upper threshold\n",
1113                         __func__);
1114                 return -ERANGE;
1115         }
1116 
1117         if (udest->tun_type == IP_VS_CONN_F_TUNNEL_TYPE_GUE) {
1118                 if (udest->tun_port == 0) {
1119                         pr_err("%s(): tunnel port is zero\n", __func__);
1120                         return -EINVAL;
1121                 }
1122         }
1123 
1124         ip_vs_addr_copy(udest->af, &daddr, &udest->addr);
1125 
1126         /* We use function that requires RCU lock */
1127         rcu_read_lock();
1128         dest = ip_vs_lookup_dest(svc, udest->af, &daddr, dport);
1129         rcu_read_unlock();
1130 
1131         if (dest == NULL) {
1132                 IP_VS_DBG(1, "%s(): dest doesn't exist\n", __func__);
1133                 return -ENOENT;
1134         }
1135 
1136         __ip_vs_update_dest(svc, dest, udest, 0);
1137         LeaveFunction(2);
1138 
1139         return 0;
1140 }
1141 
1142 /*
1143  *      Delete a destination (must be already unlinked from the service)
1144  */
1145 static void __ip_vs_del_dest(struct netns_ipvs *ipvs, struct ip_vs_dest *dest,
1146                              bool cleanup)
1147 {
1148         ip_vs_stop_estimator(ipvs, &dest->stats);
1149 
1150         /*
1151          *  Remove it from the d-linked list with the real services.
1152          */
1153         ip_vs_rs_unhash(dest);
1154 
1155         spin_lock_bh(&ipvs->dest_trash_lock);
1156         IP_VS_DBG_BUF(3, "Moving dest %s:%u into trash, dest->refcnt=%d\n",
1157                       IP_VS_DBG_ADDR(dest->af, &dest->addr), ntohs(dest->port),
1158                       refcount_read(&dest->refcnt));
1159         if (list_empty(&ipvs->dest_trash) && !cleanup)
1160                 mod_timer(&ipvs->dest_trash_timer,
1161                           jiffies + (IP_VS_DEST_TRASH_PERIOD >> 1));
1162         /* dest lives in trash with reference */
1163         list_add(&dest->t_list, &ipvs->dest_trash);
1164         dest->idle_start = 0;
1165         spin_unlock_bh(&ipvs->dest_trash_lock);
1166 }
1167 
1168 
1169 /*
1170  *      Unlink a destination from the given service
1171  */
1172 static void __ip_vs_unlink_dest(struct ip_vs_service *svc,
1173                                 struct ip_vs_dest *dest,
1174                                 int svcupd)
1175 {
1176         dest->flags &= ~IP_VS_DEST_F_AVAILABLE;
1177 
1178         /*
1179          *  Remove it from the d-linked destination list.
1180          */
1181         list_del_rcu(&dest->n_list);
1182         svc->num_dests--;
1183 
1184         if (dest->af != svc->af)
1185                 svc->ipvs->mixed_address_family_dests--;
1186 
1187         if (svcupd) {
1188                 struct ip_vs_scheduler *sched;
1189 
1190                 sched = rcu_dereference_protected(svc->scheduler, 1);
1191                 if (sched && sched->del_dest)
1192                         sched->del_dest(svc, dest);
1193         }
1194 }
1195 
1196 
1197 /*
1198  *      Delete a destination server in the given service
1199  */
1200 static int
1201 ip_vs_del_dest(struct ip_vs_service *svc, struct ip_vs_dest_user_kern *udest)
1202 {
1203         struct ip_vs_dest *dest;
1204         __be16 dport = udest->port;
1205 
1206         EnterFunction(2);
1207 
1208         /* We use function that requires RCU lock */
1209         rcu_read_lock();
1210         dest = ip_vs_lookup_dest(svc, udest->af, &udest->addr, dport);
1211         rcu_read_unlock();
1212 
1213         if (dest == NULL) {
1214                 IP_VS_DBG(1, "%s(): destination not found!\n", __func__);
1215                 return -ENOENT;
1216         }
1217 
1218         /*
1219          *      Unlink dest from the service
1220          */
1221         __ip_vs_unlink_dest(svc, dest, 1);
1222 
1223         /*
1224          *      Delete the destination
1225          */
1226         __ip_vs_del_dest(svc->ipvs, dest, false);
1227 
1228         LeaveFunction(2);
1229 
1230         return 0;
1231 }
1232 
1233 static void ip_vs_dest_trash_expire(struct timer_list *t)
1234 {
1235         struct netns_ipvs *ipvs = from_timer(ipvs, t, dest_trash_timer);
1236         struct ip_vs_dest *dest, *next;
1237         unsigned long now = jiffies;
1238 
1239         spin_lock(&ipvs->dest_trash_lock);
1240         list_for_each_entry_safe(dest, next, &ipvs->dest_trash, t_list) {
1241                 if (refcount_read(&dest->refcnt) > 1)
1242                         continue;
1243                 if (dest->idle_start) {
1244                         if (time_before(now, dest->idle_start +
1245                                              IP_VS_DEST_TRASH_PERIOD))
1246                                 continue;
1247                 } else {
1248                         dest->idle_start = max(1UL, now);
1249                         continue;
1250                 }
1251                 IP_VS_DBG_BUF(3, "Removing destination %u/%s:%u from trash\n",
1252                               dest->vfwmark,
1253                               IP_VS_DBG_ADDR(dest->af, &dest->addr),
1254                               ntohs(dest->port));
1255                 list_del(&dest->t_list);
1256                 ip_vs_dest_free(dest);
1257         }
1258         if (!list_empty(&ipvs->dest_trash))
1259                 mod_timer(&ipvs->dest_trash_timer,
1260                           jiffies + (IP_VS_DEST_TRASH_PERIOD >> 1));
1261         spin_unlock(&ipvs->dest_trash_lock);
1262 }
1263 
1264 /*
1265  *      Add a service into the service hash table
1266  */
1267 static int
1268 ip_vs_add_service(struct netns_ipvs *ipvs, struct ip_vs_service_user_kern *u,
1269                   struct ip_vs_service **svc_p)
1270 {
1271         int ret = 0, i;
1272         struct ip_vs_scheduler *sched = NULL;
1273         struct ip_vs_pe *pe = NULL;
1274         struct ip_vs_service *svc = NULL;
1275 
1276         /* increase the module use count */
1277         if (!ip_vs_use_count_inc())
1278                 return -ENOPROTOOPT;
1279 
1280         /* Lookup the scheduler by 'u->sched_name' */
1281         if (strcmp(u->sched_name, "none")) {
1282                 sched = ip_vs_scheduler_get(u->sched_name);
1283                 if (!sched) {
1284                         pr_info("Scheduler module ip_vs_%s not found\n",
1285                                 u->sched_name);
1286                         ret = -ENOENT;
1287                         goto out_err;
1288                 }
1289         }
1290 
1291         if (u->pe_name && *u->pe_name) {
1292                 pe = ip_vs_pe_getbyname(u->pe_name);
1293                 if (pe == NULL) {
1294                         pr_info("persistence engine module ip_vs_pe_%s "
1295                                 "not found\n", u->pe_name);
1296                         ret = -ENOENT;
1297                         goto out_err;
1298                 }
1299         }
1300 
1301 #ifdef CONFIG_IP_VS_IPV6
1302         if (u->af == AF_INET6) {
1303                 __u32 plen = (__force __u32) u->netmask;
1304 
1305                 if (plen < 1 || plen > 128) {
1306                         ret = -EINVAL;
1307                         goto out_err;
1308                 }
1309 
1310                 ret = nf_defrag_ipv6_enable(ipvs->net);
1311                 if (ret)
1312                         goto out_err;
1313         }
1314 #endif
1315 
1316         svc = kzalloc(sizeof(struct ip_vs_service), GFP_KERNEL);
1317         if (svc == NULL) {
1318                 IP_VS_DBG(1, "%s(): no memory\n", __func__);
1319                 ret = -ENOMEM;
1320                 goto out_err;
1321         }
1322         svc->stats.cpustats = alloc_percpu(struct ip_vs_cpu_stats);
1323         if (!svc->stats.cpustats) {
1324                 ret = -ENOMEM;
1325                 goto out_err;
1326         }
1327 
1328         for_each_possible_cpu(i) {
1329                 struct ip_vs_cpu_stats *ip_vs_stats;
1330                 ip_vs_stats = per_cpu_ptr(svc->stats.cpustats, i);
1331                 u64_stats_init(&ip_vs_stats->syncp);
1332         }
1333 
1334 
1335         /* I'm the first user of the service */
1336         atomic_set(&svc->refcnt, 0);
1337 
1338         svc->af = u->af;
1339         svc->protocol = u->protocol;
1340         ip_vs_addr_copy(svc->af, &svc->addr, &u->addr);
1341         svc->port = u->port;
1342         svc->fwmark = u->fwmark;
1343         svc->flags = u->flags;
1344         svc->timeout = u->timeout * HZ;
1345         svc->netmask = u->netmask;
1346         svc->ipvs = ipvs;
1347 
1348         INIT_LIST_HEAD(&svc->destinations);
1349         spin_lock_init(&svc->sched_lock);
1350         spin_lock_init(&svc->stats.lock);
1351 
1352         /* Bind the scheduler */
1353         if (sched) {
1354                 ret = ip_vs_bind_scheduler(svc, sched);
1355                 if (ret)
1356                         goto out_err;
1357                 sched = NULL;
1358         }
1359 
1360         /* Bind the ct retriever */
1361         RCU_INIT_POINTER(svc->pe, pe);
1362         pe = NULL;
1363 
1364         /* Update the virtual service counters */
1365         if (svc->port == FTPPORT)
1366                 atomic_inc(&ipvs->ftpsvc_counter);
1367         else if (svc->port == 0)
1368                 atomic_inc(&ipvs->nullsvc_counter);
1369         if (svc->pe && svc->pe->conn_out)
1370                 atomic_inc(&ipvs->conn_out_counter);
1371 
1372         ip_vs_start_estimator(ipvs, &svc->stats);
1373 
1374         /* Count only IPv4 services for old get/setsockopt interface */
1375         if (svc->af == AF_INET)
1376                 ipvs->num_services++;
1377 
1378         /* Hash the service into the service table */
1379         ip_vs_svc_hash(svc);
1380 
1381         *svc_p = svc;
1382         /* Now there is a service - full throttle */
1383         ipvs->enable = 1;
1384         return 0;
1385 
1386 
1387  out_err:
1388         if (svc != NULL) {
1389                 ip_vs_unbind_scheduler(svc, sched);
1390                 ip_vs_service_free(svc);
1391         }
1392         ip_vs_scheduler_put(sched);
1393         ip_vs_pe_put(pe);
1394 
1395         /* decrease the module use count */
1396         ip_vs_use_count_dec();
1397 
1398         return ret;
1399 }
1400 
1401 
1402 /*
1403  *      Edit a service and bind it with a new scheduler
1404  */
1405 static int
1406 ip_vs_edit_service(struct ip_vs_service *svc, struct ip_vs_service_user_kern *u)
1407 {
1408         struct ip_vs_scheduler *sched = NULL, *old_sched;
1409         struct ip_vs_pe *pe = NULL, *old_pe = NULL;
1410         int ret = 0;
1411         bool new_pe_conn_out, old_pe_conn_out;
1412 
1413         /*
1414          * Lookup the scheduler, by 'u->sched_name'
1415          */
1416         if (strcmp(u->sched_name, "none")) {
1417                 sched = ip_vs_scheduler_get(u->sched_name);
1418                 if (!sched) {
1419                         pr_info("Scheduler module ip_vs_%s not found\n",
1420                                 u->sched_name);
1421                         return -ENOENT;
1422                 }
1423         }
1424         old_sched = sched;
1425 
1426         if (u->pe_name && *u->pe_name) {
1427                 pe = ip_vs_pe_getbyname(u->pe_name);
1428                 if (pe == NULL) {
1429                         pr_info("persistence engine module ip_vs_pe_%s "
1430                                 "not found\n", u->pe_name);
1431                         ret = -ENOENT;
1432                         goto out;
1433                 }
1434                 old_pe = pe;
1435         }
1436 
1437 #ifdef CONFIG_IP_VS_IPV6
1438         if (u->af == AF_INET6) {
1439                 __u32 plen = (__force __u32) u->netmask;
1440 
1441                 if (plen < 1 || plen > 128) {
1442                         ret = -EINVAL;
1443                         goto out;
1444                 }
1445         }
1446 #endif
1447 
1448         old_sched = rcu_dereference_protected(svc->scheduler, 1);
1449         if (sched != old_sched) {
1450                 if (old_sched) {
1451                         ip_vs_unbind_scheduler(svc, old_sched);
1452                         RCU_INIT_POINTER(svc->scheduler, NULL);
1453                         /* Wait all svc->sched_data users */
1454                         synchronize_rcu();
1455                 }
1456                 /* Bind the new scheduler */
1457                 if (sched) {
1458                         ret = ip_vs_bind_scheduler(svc, sched);
1459                         if (ret) {
1460                                 ip_vs_scheduler_put(sched);
1461                                 goto out;
1462                         }
1463                 }
1464         }
1465 
1466         /*
1467          * Set the flags and timeout value
1468          */
1469         svc->flags = u->flags | IP_VS_SVC_F_HASHED;
1470         svc->timeout = u->timeout * HZ;
1471         svc->netmask = u->netmask;
1472 
1473         old_pe = rcu_dereference_protected(svc->pe, 1);
1474         if (pe != old_pe) {
1475                 rcu_assign_pointer(svc->pe, pe);
1476                 /* check for optional methods in new pe */
1477                 new_pe_conn_out = (pe && pe->conn_out) ? true : false;
1478                 old_pe_conn_out = (old_pe && old_pe->conn_out) ? true : false;
1479                 if (new_pe_conn_out && !old_pe_conn_out)
1480                         atomic_inc(&svc->ipvs->conn_out_counter);
1481                 if (old_pe_conn_out && !new_pe_conn_out)
1482                         atomic_dec(&svc->ipvs->conn_out_counter);
1483         }
1484 
1485 out:
1486         ip_vs_scheduler_put(old_sched);
1487         ip_vs_pe_put(old_pe);
1488         return ret;
1489 }
1490 
1491 /*
1492  *      Delete a service from the service list
1493  *      - The service must be unlinked, unlocked and not referenced!
1494  *      - We are called under _bh lock
1495  */
1496 static void __ip_vs_del_service(struct ip_vs_service *svc, bool cleanup)
1497 {
1498         struct ip_vs_dest *dest, *nxt;
1499         struct ip_vs_scheduler *old_sched;
1500         struct ip_vs_pe *old_pe;
1501         struct netns_ipvs *ipvs = svc->ipvs;
1502 
1503         /* Count only IPv4 services for old get/setsockopt interface */
1504         if (svc->af == AF_INET)
1505                 ipvs->num_services--;
1506 
1507         ip_vs_stop_estimator(svc->ipvs, &svc->stats);
1508 
1509         /* Unbind scheduler */
1510         old_sched = rcu_dereference_protected(svc->scheduler, 1);
1511         ip_vs_unbind_scheduler(svc, old_sched);
1512         ip_vs_scheduler_put(old_sched);
1513 
1514         /* Unbind persistence engine, keep svc->pe */
1515         old_pe = rcu_dereference_protected(svc->pe, 1);
1516         if (old_pe && old_pe->conn_out)
1517                 atomic_dec(&ipvs->conn_out_counter);
1518         ip_vs_pe_put(old_pe);
1519 
1520         /*
1521          *    Unlink the whole destination list
1522          */
1523         list_for_each_entry_safe(dest, nxt, &svc->destinations, n_list) {
1524                 __ip_vs_unlink_dest(svc, dest, 0);
1525                 __ip_vs_del_dest(svc->ipvs, dest, cleanup);
1526         }
1527 
1528         /*
1529          *    Update the virtual service counters
1530          */
1531         if (svc->port == FTPPORT)
1532                 atomic_dec(&ipvs->ftpsvc_counter);
1533         else if (svc->port == 0)
1534                 atomic_dec(&ipvs->nullsvc_counter);
1535 
1536         /*
1537          *    Free the service if nobody refers to it
1538          */
1539         __ip_vs_svc_put(svc, true);
1540 
1541         /* decrease the module use count */
1542         ip_vs_use_count_dec();
1543 }
1544 
1545 /*
1546  * Unlink a service from list and try to delete it if its refcnt reached 0
1547  */
1548 static void ip_vs_unlink_service(struct ip_vs_service *svc, bool cleanup)
1549 {
1550         ip_vs_unregister_conntrack(svc);
1551         /* Hold svc to avoid double release from dest_trash */
1552         atomic_inc(&svc->refcnt);
1553         /*
1554          * Unhash it from the service table
1555          */
1556         ip_vs_svc_unhash(svc);
1557 
1558         __ip_vs_del_service(svc, cleanup);
1559 }
1560 
1561 /*
1562  *      Delete a service from the service list
1563  */
1564 static int ip_vs_del_service(struct ip_vs_service *svc)
1565 {
1566         if (svc == NULL)
1567                 return -EEXIST;
1568         ip_vs_unlink_service(svc, false);
1569 
1570         return 0;
1571 }
1572 
1573 
1574 /*
1575  *      Flush all the virtual services
1576  */
1577 static int ip_vs_flush(struct netns_ipvs *ipvs, bool cleanup)
1578 {
1579         int idx;
1580         struct ip_vs_service *svc;
1581         struct hlist_node *n;
1582 
1583         /*
1584          * Flush the service table hashed by <netns,protocol,addr,port>
1585          */
1586         for(idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
1587                 hlist_for_each_entry_safe(svc, n, &ip_vs_svc_table[idx],
1588                                           s_list) {
1589                         if (svc->ipvs == ipvs)
1590                                 ip_vs_unlink_service(svc, cleanup);
1591                 }
1592         }
1593 
1594         /*
1595          * Flush the service table hashed by fwmark
1596          */
1597         for(idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
1598                 hlist_for_each_entry_safe(svc, n, &ip_vs_svc_fwm_table[idx],
1599                                           f_list) {
1600                         if (svc->ipvs == ipvs)
1601                                 ip_vs_unlink_service(svc, cleanup);
1602                 }
1603         }
1604 
1605         return 0;
1606 }
1607 
1608 /*
1609  *      Delete service by {netns} in the service table.
1610  *      Called by __ip_vs_batch_cleanup()
1611  */
1612 void ip_vs_service_nets_cleanup(struct list_head *net_list)
1613 {
1614         struct netns_ipvs *ipvs;
1615         struct net *net;
1616 
1617         EnterFunction(2);
1618         /* Check for "full" addressed entries */
1619         mutex_lock(&__ip_vs_mutex);
1620         list_for_each_entry(net, net_list, exit_list) {
1621                 ipvs = net_ipvs(net);
1622                 ip_vs_flush(ipvs, true);
1623         }
1624         mutex_unlock(&__ip_vs_mutex);
1625         LeaveFunction(2);
1626 }
1627 
1628 /* Put all references for device (dst_cache) */
1629 static inline void
1630 ip_vs_forget_dev(struct ip_vs_dest *dest, struct net_device *dev)
1631 {
1632         struct ip_vs_dest_dst *dest_dst;
1633 
1634         spin_lock_bh(&dest->dst_lock);
1635         dest_dst = rcu_dereference_protected(dest->dest_dst, 1);
1636         if (dest_dst && dest_dst->dst_cache->dev == dev) {
1637                 IP_VS_DBG_BUF(3, "Reset dev:%s dest %s:%u ,dest->refcnt=%d\n",
1638                               dev->name,
1639                               IP_VS_DBG_ADDR(dest->af, &dest->addr),
1640                               ntohs(dest->port),
1641                               refcount_read(&dest->refcnt));
1642                 __ip_vs_dst_cache_reset(dest);
1643         }
1644         spin_unlock_bh(&dest->dst_lock);
1645 
1646 }
1647 /* Netdev event receiver
1648  * Currently only NETDEV_DOWN is handled to release refs to cached dsts
1649  */
1650 static int ip_vs_dst_event(struct notifier_block *this, unsigned long event,
1651                            void *ptr)
1652 {
1653         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1654         struct net *net = dev_net(dev);
1655         struct netns_ipvs *ipvs = net_ipvs(net);
1656         struct ip_vs_service *svc;
1657         struct ip_vs_dest *dest;
1658         unsigned int idx;
1659 
1660         if (event != NETDEV_DOWN || !ipvs)
1661                 return NOTIFY_DONE;
1662         IP_VS_DBG(3, "%s() dev=%s\n", __func__, dev->name);
1663         EnterFunction(2);
1664         mutex_lock(&__ip_vs_mutex);
1665         for (idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
1666                 hlist_for_each_entry(svc, &ip_vs_svc_table[idx], s_list) {
1667                         if (svc->ipvs == ipvs) {
1668                                 list_for_each_entry(dest, &svc->destinations,
1669                                                     n_list) {
1670                                         ip_vs_forget_dev(dest, dev);
1671                                 }
1672                         }
1673                 }
1674 
1675                 hlist_for_each_entry(svc, &ip_vs_svc_fwm_table[idx], f_list) {
1676                         if (svc->ipvs == ipvs) {
1677                                 list_for_each_entry(dest, &svc->destinations,
1678                                                     n_list) {
1679                                         ip_vs_forget_dev(dest, dev);
1680                                 }
1681                         }
1682 
1683                 }
1684         }
1685 
1686         spin_lock_bh(&ipvs->dest_trash_lock);
1687         list_for_each_entry(dest, &ipvs->dest_trash, t_list) {
1688                 ip_vs_forget_dev(dest, dev);
1689         }
1690         spin_unlock_bh(&ipvs->dest_trash_lock);
1691         mutex_unlock(&__ip_vs_mutex);
1692         LeaveFunction(2);
1693         return NOTIFY_DONE;
1694 }
1695 
1696 /*
1697  *      Zero counters in a service or all services
1698  */
1699 static int ip_vs_zero_service(struct ip_vs_service *svc)
1700 {
1701         struct ip_vs_dest *dest;
1702 
1703         list_for_each_entry(dest, &svc->destinations, n_list) {
1704                 ip_vs_zero_stats(&dest->stats);
1705         }
1706         ip_vs_zero_stats(&svc->stats);
1707         return 0;
1708 }
1709 
1710 static int ip_vs_zero_all(struct netns_ipvs *ipvs)
1711 {
1712         int idx;
1713         struct ip_vs_service *svc;
1714 
1715         for(idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
1716                 hlist_for_each_entry(svc, &ip_vs_svc_table[idx], s_list) {
1717                         if (svc->ipvs == ipvs)
1718                                 ip_vs_zero_service(svc);
1719                 }
1720         }
1721 
1722         for(idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
1723                 hlist_for_each_entry(svc, &ip_vs_svc_fwm_table[idx], f_list) {
1724                         if (svc->ipvs == ipvs)
1725                                 ip_vs_zero_service(svc);
1726                 }
1727         }
1728 
1729         ip_vs_zero_stats(&ipvs->tot_stats);
1730         return 0;
1731 }
1732 
1733 #ifdef CONFIG_SYSCTL
1734 
1735 static int three = 3;
1736 
1737 static int
1738 proc_do_defense_mode(struct ctl_table *table, int write,
1739                      void __user *buffer, size_t *lenp, loff_t *ppos)
1740 {
1741         struct netns_ipvs *ipvs = table->extra2;
1742         int *valp = table->data;
1743         int val = *valp;
1744         int rc;
1745 
1746         struct ctl_table tmp = {
1747                 .data = &val,
1748                 .maxlen = sizeof(int),
1749                 .mode = table->mode,
1750         };
1751 
1752         rc = proc_dointvec(&tmp, write, buffer, lenp, ppos);
1753         if (write && (*valp != val)) {
1754                 if (val < 0 || val > 3) {
1755                         rc = -EINVAL;
1756                 } else {
1757                         *valp = val;
1758                         update_defense_level(ipvs);
1759                 }
1760         }
1761         return rc;
1762 }
1763 
1764 static int
1765 proc_do_sync_threshold(struct ctl_table *table, int write,
1766                        void __user *buffer, size_t *lenp, loff_t *ppos)
1767 {
1768         int *valp = table->data;
1769         int val[2];
1770         int rc;
1771         struct ctl_table tmp = {
1772                 .data = &val,
1773                 .maxlen = table->maxlen,
1774                 .mode = table->mode,
1775         };
1776 
1777         memcpy(val, valp, sizeof(val));
1778         rc = proc_dointvec(&tmp, write, buffer, lenp, ppos);
1779         if (write) {
1780                 if (val[0] < 0 || val[1] < 0 ||
1781                     (val[0] >= val[1] && val[1]))
1782                         rc = -EINVAL;
1783                 else
1784                         memcpy(valp, val, sizeof(val));
1785         }
1786         return rc;
1787 }
1788 
1789 static int
1790 proc_do_sync_ports(struct ctl_table *table, int write,
1791                    void __user *buffer, size_t *lenp, loff_t *ppos)
1792 {
1793         int *valp = table->data;
1794         int val = *valp;
1795         int rc;
1796 
1797         struct ctl_table tmp = {
1798                 .data = &val,
1799                 .maxlen = sizeof(int),
1800                 .mode = table->mode,
1801         };
1802 
1803         rc = proc_dointvec(&tmp, write, buffer, lenp, ppos);
1804         if (write && (*valp != val)) {
1805                 if (val < 1 || !is_power_of_2(val))
1806                         rc = -EINVAL;
1807                 else
1808                         *valp = val;
1809         }
1810         return rc;
1811 }
1812 
1813 /*
1814  *      IPVS sysctl table (under the /proc/sys/net/ipv4/vs/)
1815  *      Do not change order or insert new entries without
1816  *      align with netns init in ip_vs_control_net_init()
1817  */
1818 
1819 static struct ctl_table vs_vars[] = {
1820         {
1821                 .procname       = "amemthresh",
1822                 .maxlen         = sizeof(int),
1823                 .mode           = 0644,
1824                 .proc_handler   = proc_dointvec,
1825         },
1826         {
1827                 .procname       = "am_droprate",
1828                 .maxlen         = sizeof(int),
1829                 .mode           = 0644,
1830                 .proc_handler   = proc_dointvec,
1831         },
1832         {
1833                 .procname       = "drop_entry",
1834                 .maxlen         = sizeof(int),
1835                 .mode           = 0644,
1836                 .proc_handler   = proc_do_defense_mode,
1837         },
1838         {
1839                 .procname       = "drop_packet",
1840                 .maxlen         = sizeof(int),
1841                 .mode           = 0644,
1842                 .proc_handler   = proc_do_defense_mode,
1843         },
1844 #ifdef CONFIG_IP_VS_NFCT
1845         {
1846                 .procname       = "conntrack",
1847                 .maxlen         = sizeof(int),
1848                 .mode           = 0644,
1849                 .proc_handler   = &proc_dointvec,
1850         },
1851 #endif
1852         {
1853                 .procname       = "secure_tcp",
1854                 .maxlen         = sizeof(int),
1855                 .mode           = 0644,
1856                 .proc_handler   = proc_do_defense_mode,
1857         },
1858         {
1859                 .procname       = "snat_reroute",
1860                 .maxlen         = sizeof(int),
1861                 .mode           = 0644,
1862                 .proc_handler   = &proc_dointvec,
1863         },
1864         {
1865                 .procname       = "sync_version",
1866                 .maxlen         = sizeof(int),
1867                 .mode           = 0644,
1868                 .proc_handler   = proc_dointvec_minmax,
1869                 .extra1         = SYSCTL_ZERO,
1870                 .extra2         = SYSCTL_ONE,
1871         },
1872         {
1873                 .procname       = "sync_ports",
1874                 .maxlen         = sizeof(int),
1875                 .mode           = 0644,
1876                 .proc_handler   = proc_do_sync_ports,
1877         },
1878         {
1879                 .procname       = "sync_persist_mode",
1880                 .maxlen         = sizeof(int),
1881                 .mode           = 0644,
1882                 .proc_handler   = proc_dointvec,
1883         },
1884         {
1885                 .procname       = "sync_qlen_max",
1886                 .maxlen         = sizeof(unsigned long),
1887                 .mode           = 0644,
1888                 .proc_handler   = proc_doulongvec_minmax,
1889         },
1890         {
1891                 .procname       = "sync_sock_size",
1892                 .maxlen         = sizeof(int),
1893                 .mode           = 0644,
1894                 .proc_handler   = proc_dointvec,
1895         },
1896         {
1897                 .procname       = "cache_bypass",
1898                 .maxlen         = sizeof(int),
1899                 .mode           = 0644,
1900                 .proc_handler   = proc_dointvec,
1901         },
1902         {
1903                 .procname       = "expire_nodest_conn",
1904                 .maxlen         = sizeof(int),
1905                 .mode           = 0644,
1906                 .proc_handler   = proc_dointvec,
1907         },
1908         {
1909                 .procname       = "sloppy_tcp",
1910                 .maxlen         = sizeof(int),
1911                 .mode           = 0644,
1912                 .proc_handler   = proc_dointvec,
1913         },
1914         {
1915                 .procname       = "sloppy_sctp",
1916                 .maxlen         = sizeof(int),
1917                 .mode           = 0644,
1918                 .proc_handler   = proc_dointvec,
1919         },
1920         {
1921                 .procname       = "expire_quiescent_template",
1922                 .maxlen         = sizeof(int),
1923                 .mode           = 0644,
1924                 .proc_handler   = proc_dointvec,
1925         },
1926         {
1927                 .procname       = "sync_threshold",
1928                 .maxlen         =
1929                         sizeof(((struct netns_ipvs *)0)->sysctl_sync_threshold),
1930                 .mode           = 0644,
1931                 .proc_handler   = proc_do_sync_threshold,
1932         },
1933         {
1934                 .procname       = "sync_refresh_period",
1935                 .maxlen         = sizeof(int),
1936                 .mode           = 0644,
1937                 .proc_handler   = proc_dointvec_jiffies,
1938         },
1939         {
1940                 .procname       = "sync_retries",
1941                 .maxlen         = sizeof(int),
1942                 .mode           = 0644,
1943                 .proc_handler   = proc_dointvec_minmax,
1944                 .extra1         = SYSCTL_ZERO,
1945                 .extra2         = &three,
1946         },
1947         {
1948                 .procname       = "nat_icmp_send",
1949                 .maxlen         = sizeof(int),
1950                 .mode           = 0644,
1951                 .proc_handler   = proc_dointvec,
1952         },
1953         {
1954                 .procname       = "pmtu_disc",
1955                 .maxlen         = sizeof(int),
1956                 .mode           = 0644,
1957                 .proc_handler   = proc_dointvec,
1958         },
1959         {
1960                 .procname       = "backup_only",
1961                 .maxlen         = sizeof(int),
1962                 .mode           = 0644,
1963                 .proc_handler   = proc_dointvec,
1964         },
1965         {
1966                 .procname       = "conn_reuse_mode",
1967                 .maxlen         = sizeof(int),
1968                 .mode           = 0644,
1969                 .proc_handler   = proc_dointvec,
1970         },
1971         {
1972                 .procname       = "schedule_icmp",
1973                 .maxlen         = sizeof(int),
1974                 .mode           = 0644,
1975                 .proc_handler   = proc_dointvec,
1976         },
1977         {
1978                 .procname       = "ignore_tunneled",
1979                 .maxlen         = sizeof(int),
1980                 .mode           = 0644,
1981                 .proc_handler   = proc_dointvec,
1982         },
1983 #ifdef CONFIG_IP_VS_DEBUG
1984         {
1985                 .procname       = "debug_level",
1986                 .data           = &sysctl_ip_vs_debug_level,
1987                 .maxlen         = sizeof(int),
1988                 .mode           = 0644,
1989                 .proc_handler   = proc_dointvec,
1990         },
1991 #endif
1992         { }
1993 };
1994 
1995 #endif
1996 
1997 #ifdef CONFIG_PROC_FS
1998 
1999 struct ip_vs_iter {
2000         struct seq_net_private p;  /* Do not move this, netns depends upon it*/
2001         struct hlist_head *table;
2002         int bucket;
2003 };
2004 
2005 /*
2006  *      Write the contents of the VS rule table to a PROCfs file.
2007  *      (It is kept just for backward compatibility)
2008  */
2009 static inline const char *ip_vs_fwd_name(unsigned int flags)
2010 {
2011         switch (flags & IP_VS_CONN_F_FWD_MASK) {
2012         case IP_VS_CONN_F_LOCALNODE:
2013                 return "Local";
2014         case IP_VS_CONN_F_TUNNEL:
2015                 return "Tunnel";
2016         case IP_VS_CONN_F_DROUTE:
2017                 return "Route";
2018         default:
2019                 return "Masq";
2020         }
2021 }
2022 
2023 
2024 /* Get the Nth entry in the two lists */
2025 static struct ip_vs_service *ip_vs_info_array(struct seq_file *seq, loff_t pos)
2026 {
2027         struct net *net = seq_file_net(seq);
2028         struct netns_ipvs *ipvs = net_ipvs(net);
2029         struct ip_vs_iter *iter = seq->private;
2030         int idx;
2031         struct ip_vs_service *svc;
2032 
2033         /* look in hash by protocol */
2034         for (idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
2035                 hlist_for_each_entry_rcu(svc, &ip_vs_svc_table[idx], s_list) {
2036                         if ((svc->ipvs == ipvs) && pos-- == 0) {
2037                                 iter->table = ip_vs_svc_table;
2038                                 iter->bucket = idx;
2039                                 return svc;
2040                         }
2041                 }
2042         }
2043 
2044         /* keep looking in fwmark */
2045         for (idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
2046                 hlist_for_each_entry_rcu(svc, &ip_vs_svc_fwm_table[idx],
2047                                          f_list) {
2048                         if ((svc->ipvs == ipvs) && pos-- == 0) {
2049                                 iter->table = ip_vs_svc_fwm_table;
2050                                 iter->bucket = idx;
2051                                 return svc;
2052                         }
2053                 }
2054         }
2055 
2056         return NULL;
2057 }
2058 
2059 static void *ip_vs_info_seq_start(struct seq_file *seq, loff_t *pos)
2060         __acquires(RCU)
2061 {
2062         rcu_read_lock();
2063         return *pos ? ip_vs_info_array(seq, *pos - 1) : SEQ_START_TOKEN;
2064 }
2065 
2066 
2067 static void *ip_vs_info_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2068 {
2069         struct hlist_node *e;
2070         struct ip_vs_iter *iter;
2071         struct ip_vs_service *svc;
2072 
2073         ++*pos;
2074         if (v == SEQ_START_TOKEN)
2075                 return ip_vs_info_array(seq,0);
2076 
2077         svc = v;
2078         iter = seq->private;
2079 
2080         if (iter->table == ip_vs_svc_table) {
2081                 /* next service in table hashed by protocol */
2082                 e = rcu_dereference(hlist_next_rcu(&svc->s_list));
2083                 if (e)
2084                         return hlist_entry(e, struct ip_vs_service, s_list);
2085 
2086                 while (++iter->bucket < IP_VS_SVC_TAB_SIZE) {
2087                         hlist_for_each_entry_rcu(svc,
2088                                                  &ip_vs_svc_table[iter->bucket],
2089                                                  s_list) {
2090                                 return svc;
2091                         }
2092                 }
2093 
2094                 iter->table = ip_vs_svc_fwm_table;
2095                 iter->bucket = -1;
2096                 goto scan_fwmark;
2097         }
2098 
2099         /* next service in hashed by fwmark */
2100         e = rcu_dereference(hlist_next_rcu(&svc->f_list));
2101         if (e)
2102                 return hlist_entry(e, struct ip_vs_service, f_list);
2103 
2104  scan_fwmark:
2105         while (++iter->bucket < IP_VS_SVC_TAB_SIZE) {
2106                 hlist_for_each_entry_rcu(svc,
2107                                          &ip_vs_svc_fwm_table[iter->bucket],
2108                                          f_list)
2109                         return svc;
2110         }
2111 
2112         return NULL;
2113 }
2114 
2115 static void ip_vs_info_seq_stop(struct seq_file *seq, void *v)
2116         __releases(RCU)
2117 {
2118         rcu_read_unlock();
2119 }
2120 
2121 
2122 static int ip_vs_info_seq_show(struct seq_file *seq, void *v)
2123 {
2124         if (v == SEQ_START_TOKEN) {
2125                 seq_printf(seq,
2126                         "IP Virtual Server version %d.%d.%d (size=%d)\n",
2127                         NVERSION(IP_VS_VERSION_CODE), ip_vs_conn_tab_size);
2128                 seq_puts(seq,
2129                          "Prot LocalAddress:Port Scheduler Flags\n");
2130                 seq_puts(seq,
2131                          "  -> RemoteAddress:Port Forward Weight ActiveConn InActConn\n");
2132         } else {
2133                 struct net *net = seq_file_net(seq);
2134                 struct netns_ipvs *ipvs = net_ipvs(net);
2135                 const struct ip_vs_service *svc = v;
2136                 const struct ip_vs_iter *iter = seq->private;
2137                 const struct ip_vs_dest *dest;
2138                 struct ip_vs_scheduler *sched = rcu_dereference(svc->scheduler);
2139                 char *sched_name = sched ? sched->name : "none";
2140 
2141                 if (svc->ipvs != ipvs)
2142                         return 0;
2143                 if (iter->table == ip_vs_svc_table) {
2144 #ifdef CONFIG_IP_VS_IPV6
2145                         if (svc->af == AF_INET6)
2146                                 seq_printf(seq, "%s  [%pI6]:%04X %s ",
2147                                            ip_vs_proto_name(svc->protocol),
2148                                            &svc->addr.in6,
2149                                            ntohs(svc->port),
2150                                            sched_name);
2151                         else
2152 #endif
2153                                 seq_printf(seq, "%s  %08X:%04X %s %s ",
2154                                            ip_vs_proto_name(svc->protocol),
2155                                            ntohl(svc->addr.ip),
2156                                            ntohs(svc->port),
2157                                            sched_name,
2158                                            (svc->flags & IP_VS_SVC_F_ONEPACKET)?"ops ":"");
2159                 } else {
2160                         seq_printf(seq, "FWM  %08X %s %s",
2161                                    svc->fwmark, sched_name,
2162                                    (svc->flags & IP_VS_SVC_F_ONEPACKET)?"ops ":"");
2163                 }
2164 
2165                 if (svc->flags & IP_VS_SVC_F_PERSISTENT)
2166                         seq_printf(seq, "persistent %d %08X\n",
2167                                 svc->timeout,
2168                                 ntohl(svc->netmask));
2169                 else
2170                         seq_putc(seq, '\n');
2171 
2172                 list_for_each_entry_rcu(dest, &svc->destinations, n_list) {
2173 #ifdef CONFIG_IP_VS_IPV6
2174                         if (dest->af == AF_INET6)
2175                                 seq_printf(seq,
2176                                            "  -> [%pI6]:%04X"
2177                                            "      %-7s %-6d %-10d %-10d\n",
2178                                            &dest->addr.in6,
2179                                            ntohs(dest->port),
2180                                            ip_vs_fwd_name(atomic_read(&dest->conn_flags)),
2181                                            atomic_read(&dest->weight),
2182                                            atomic_read(&dest->activeconns),
2183                                            atomic_read(&dest->inactconns));
2184                         else
2185 #endif
2186                                 seq_printf(seq,
2187                                            "  -> %08X:%04X      "
2188                                            "%-7s %-6d %-10d %-10d\n",
2189                                            ntohl(dest->addr.ip),
2190                                            ntohs(dest->port),
2191                                            ip_vs_fwd_name(atomic_read(&dest->conn_flags)),
2192                                            atomic_read(&dest->weight),
2193                                            atomic_read(&dest->activeconns),
2194                                            atomic_read(&dest->inactconns));
2195 
2196                 }
2197         }
2198         return 0;
2199 }
2200 
2201 static const struct seq_operations ip_vs_info_seq_ops = {
2202         .start = ip_vs_info_seq_start,
2203         .next  = ip_vs_info_seq_next,
2204         .stop  = ip_vs_info_seq_stop,
2205         .show  = ip_vs_info_seq_show,
2206 };
2207 
2208 static int ip_vs_stats_show(struct seq_file *seq, void *v)
2209 {
2210         struct net *net = seq_file_single_net(seq);
2211         struct ip_vs_kstats show;
2212 
2213 /*               01234567 01234567 01234567 0123456701234567 0123456701234567 */
2214         seq_puts(seq,
2215                  "   Total Incoming Outgoing         Incoming         Outgoing\n");
2216         seq_puts(seq,
2217                  "   Conns  Packets  Packets            Bytes            Bytes\n");
2218 
2219         ip_vs_copy_stats(&show, &net_ipvs(net)->tot_stats);
2220         seq_printf(seq, "%8LX %8LX %8LX %16LX %16LX\n\n",
2221                    (unsigned long long)show.conns,
2222                    (unsigned long long)show.inpkts,
2223                    (unsigned long long)show.outpkts,
2224                    (unsigned long long)show.inbytes,
2225                    (unsigned long long)show.outbytes);
2226 
2227 /*                01234567 01234567 01234567 0123456701234567 0123456701234567*/
2228         seq_puts(seq,
2229                  " Conns/s   Pkts/s   Pkts/s          Bytes/s          Bytes/s\n");
2230         seq_printf(seq, "%8LX %8LX %8LX %16LX %16LX\n",
2231                    (unsigned long long)show.cps,
2232                    (unsigned long long)show.inpps,
2233                    (unsigned long long)show.outpps,
2234                    (unsigned long long)show.inbps,
2235                    (unsigned long long)show.outbps);
2236 
2237         return 0;
2238 }
2239 
2240 static int ip_vs_stats_percpu_show(struct seq_file *seq, void *v)
2241 {
2242         struct net *net = seq_file_single_net(seq);
2243         struct ip_vs_stats *tot_stats = &net_ipvs(net)->tot_stats;
2244         struct ip_vs_cpu_stats __percpu *cpustats = tot_stats->cpustats;
2245         struct ip_vs_kstats kstats;
2246         int i;
2247 
2248 /*               01234567 01234567 01234567 0123456701234567 0123456701234567 */
2249         seq_puts(seq,
2250                  "       Total Incoming Outgoing         Incoming         Outgoing\n");
2251         seq_puts(seq,
2252                  "CPU    Conns  Packets  Packets            Bytes            Bytes\n");
2253 
2254         for_each_possible_cpu(i) {
2255                 struct ip_vs_cpu_stats *u = per_cpu_ptr(cpustats, i);
2256                 unsigned int start;
2257                 u64 conns, inpkts, outpkts, inbytes, outbytes;
2258 
2259                 do {
2260                         start = u64_stats_fetch_begin_irq(&u->syncp);
2261                         conns = u->cnt.conns;
2262                         inpkts = u->cnt.inpkts;
2263                         outpkts = u->cnt.outpkts;
2264                         inbytes = u->cnt.inbytes;
2265                         outbytes = u->cnt.outbytes;
2266                 } while (u64_stats_fetch_retry_irq(&u->syncp, start));
2267 
2268                 seq_printf(seq, "%3X %8LX %8LX %8LX %16LX %16LX\n",
2269                            i, (u64)conns, (u64)inpkts,
2270                            (u64)outpkts, (u64)inbytes,
2271                            (u64)outbytes);
2272         }
2273 
2274         ip_vs_copy_stats(&kstats, tot_stats);
2275 
2276         seq_printf(seq, "  ~ %8LX %8LX %8LX %16LX %16LX\n\n",
2277                    (unsigned long long)kstats.conns,
2278                    (unsigned long long)kstats.inpkts,
2279                    (unsigned long long)kstats.outpkts,
2280                    (unsigned long long)kstats.inbytes,
2281                    (unsigned long long)kstats.outbytes);
2282 
2283 /*                ... 01234567 01234567 01234567 0123456701234567 0123456701234567 */
2284         seq_puts(seq,
2285                  "     Conns/s   Pkts/s   Pkts/s          Bytes/s          Bytes/s\n");
2286         seq_printf(seq, "    %8LX %8LX %8LX %16LX %16LX\n",
2287                    kstats.cps,
2288                    kstats.inpps,
2289                    kstats.outpps,
2290                    kstats.inbps,
2291                    kstats.outbps);
2292 
2293         return 0;
2294 }
2295 #endif
2296 
2297 /*
2298  *      Set timeout values for tcp tcpfin udp in the timeout_table.
2299  */
2300 static int ip_vs_set_timeout(struct netns_ipvs *ipvs, struct ip_vs_timeout_user *u)
2301 {
2302 #if defined(CONFIG_IP_VS_PROTO_TCP) || defined(CONFIG_IP_VS_PROTO_UDP)
2303         struct ip_vs_proto_data *pd;
2304 #endif
2305 
2306         IP_VS_DBG(2, "Setting timeout tcp:%d tcpfin:%d udp:%d\n",
2307                   u->tcp_timeout,
2308                   u->tcp_fin_timeout,
2309                   u->udp_timeout);
2310 
2311 #ifdef CONFIG_IP_VS_PROTO_TCP
2312         if (u->tcp_timeout < 0 || u->tcp_timeout > (INT_MAX / HZ) ||
2313             u->tcp_fin_timeout < 0 || u->tcp_fin_timeout > (INT_MAX / HZ)) {
2314                 return -EINVAL;
2315         }
2316 #endif
2317 
2318 #ifdef CONFIG_IP_VS_PROTO_UDP
2319         if (u->udp_timeout < 0 || u->udp_timeout > (INT_MAX / HZ))
2320                 return -EINVAL;
2321 #endif
2322 
2323 #ifdef CONFIG_IP_VS_PROTO_TCP
2324         if (u->tcp_timeout) {
2325                 pd = ip_vs_proto_data_get(ipvs, IPPROTO_TCP);
2326                 pd->timeout_table[IP_VS_TCP_S_ESTABLISHED]
2327                         = u->tcp_timeout * HZ;
2328         }
2329 
2330         if (u->tcp_fin_timeout) {
2331                 pd = ip_vs_proto_data_get(ipvs, IPPROTO_TCP);
2332                 pd->timeout_table[IP_VS_TCP_S_FIN_WAIT]
2333                         = u->tcp_fin_timeout * HZ;
2334         }
2335 #endif
2336 
2337 #ifdef CONFIG_IP_VS_PROTO_UDP
2338         if (u->udp_timeout) {
2339                 pd = ip_vs_proto_data_get(ipvs, IPPROTO_UDP);
2340                 pd->timeout_table[IP_VS_UDP_S_NORMAL]
2341                         = u->udp_timeout * HZ;
2342         }
2343 #endif
2344         return 0;
2345 }
2346 
2347 #define CMDID(cmd)              (cmd - IP_VS_BASE_CTL)
2348 
2349 struct ip_vs_svcdest_user {
2350         struct ip_vs_service_user       s;
2351         struct ip_vs_dest_user          d;
2352 };
2353 
2354 static const unsigned char set_arglen[CMDID(IP_VS_SO_SET_MAX) + 1] = {
2355         [CMDID(IP_VS_SO_SET_ADD)]         = sizeof(struct ip_vs_service_user),
2356         [CMDID(IP_VS_SO_SET_EDIT)]        = sizeof(struct ip_vs_service_user),
2357         [CMDID(IP_VS_SO_SET_DEL)]         = sizeof(struct ip_vs_service_user),
2358         [CMDID(IP_VS_SO_SET_ADDDEST)]     = sizeof(struct ip_vs_svcdest_user),
2359         [CMDID(IP_VS_SO_SET_DELDEST)]     = sizeof(struct ip_vs_svcdest_user),
2360         [CMDID(IP_VS_SO_SET_EDITDEST)]    = sizeof(struct ip_vs_svcdest_user),
2361         [CMDID(IP_VS_SO_SET_TIMEOUT)]     = sizeof(struct ip_vs_timeout_user),
2362         [CMDID(IP_VS_SO_SET_STARTDAEMON)] = sizeof(struct ip_vs_daemon_user),
2363         [CMDID(IP_VS_SO_SET_STOPDAEMON)]  = sizeof(struct ip_vs_daemon_user),
2364         [CMDID(IP_VS_SO_SET_ZERO)]        = sizeof(struct ip_vs_service_user),
2365 };
2366 
2367 union ip_vs_set_arglen {
2368         struct ip_vs_service_user       field_IP_VS_SO_SET_ADD;
2369         struct ip_vs_service_user       field_IP_VS_SO_SET_EDIT;
2370         struct ip_vs_service_user       field_IP_VS_SO_SET_DEL;
2371         struct ip_vs_svcdest_user       field_IP_VS_SO_SET_ADDDEST;
2372         struct ip_vs_svcdest_user       field_IP_VS_SO_SET_DELDEST;
2373         struct ip_vs_svcdest_user       field_IP_VS_SO_SET_EDITDEST;
2374         struct ip_vs_timeout_user       field_IP_VS_SO_SET_TIMEOUT;
2375         struct ip_vs_daemon_user        field_IP_VS_SO_SET_STARTDAEMON;
2376         struct ip_vs_daemon_user        field_IP_VS_SO_SET_STOPDAEMON;
2377         struct ip_vs_service_user       field_IP_VS_SO_SET_ZERO;
2378 };
2379 
2380 #define MAX_SET_ARGLEN  sizeof(union ip_vs_set_arglen)
2381 
2382 static void ip_vs_copy_usvc_compat(struct ip_vs_service_user_kern *usvc,
2383                                   struct ip_vs_service_user *usvc_compat)
2384 {
2385         memset(usvc, 0, sizeof(*usvc));
2386 
2387         usvc->af                = AF_INET;
2388         usvc->protocol          = usvc_compat->protocol;
2389         usvc->addr.ip           = usvc_compat->addr;
2390         usvc->port              = usvc_compat->port;
2391         usvc->fwmark            = usvc_compat->fwmark;
2392 
2393         /* Deep copy of sched_name is not needed here */
2394         usvc->sched_name        = usvc_compat->sched_name;
2395 
2396         usvc->flags             = usvc_compat->flags;
2397         usvc->timeout           = usvc_compat->timeout;
2398         usvc->netmask           = usvc_compat->netmask;
2399 }
2400 
2401 static void ip_vs_copy_udest_compat(struct ip_vs_dest_user_kern *udest,
2402                                    struct ip_vs_dest_user *udest_compat)
2403 {
2404         memset(udest, 0, sizeof(*udest));
2405 
2406         udest->addr.ip          = udest_compat->addr;
2407         udest->port             = udest_compat->port;
2408         udest->conn_flags       = udest_compat->conn_flags;
2409         udest->weight           = udest_compat->weight;
2410         udest->u_threshold      = udest_compat->u_threshold;
2411         udest->l_threshold      = udest_compat->l_threshold;
2412         udest->af               = AF_INET;
2413         udest->tun_type         = IP_VS_CONN_F_TUNNEL_TYPE_IPIP;
2414 }
2415 
2416 static int
2417 do_ip_vs_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len)
2418 {
2419         struct net *net = sock_net(sk);
2420         int ret;
2421         unsigned char arg[MAX_SET_ARGLEN];
2422         struct ip_vs_service_user *usvc_compat;
2423         struct ip_vs_service_user_kern usvc;
2424         struct ip_vs_service *svc;
2425         struct ip_vs_dest_user *udest_compat;
2426         struct ip_vs_dest_user_kern udest;
2427         struct netns_ipvs *ipvs = net_ipvs(net);
2428 
2429         BUILD_BUG_ON(sizeof(arg) > 255);
2430         if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
2431                 return -EPERM;
2432 
2433         if (cmd < IP_VS_BASE_CTL || cmd > IP_VS_SO_SET_MAX)
2434                 return -EINVAL;
2435         if (len != set_arglen[CMDID(cmd)]) {
2436                 IP_VS_DBG(1, "set_ctl: len %u != %u\n",
2437                           len, set_arglen[CMDID(cmd)]);
2438                 return -EINVAL;
2439         }
2440 
2441         if (copy_from_user(arg, user, len) != 0)
2442                 return -EFAULT;
2443 
2444         /* Handle daemons since they have another lock */
2445         if (cmd == IP_VS_SO_SET_STARTDAEMON ||
2446             cmd == IP_VS_SO_SET_STOPDAEMON) {
2447                 struct ip_vs_daemon_user *dm = (struct ip_vs_daemon_user *)arg;
2448 
2449                 if (cmd == IP_VS_SO_SET_STARTDAEMON) {
2450                         struct ipvs_sync_daemon_cfg cfg;
2451 
2452                         memset(&cfg, 0, sizeof(cfg));
2453                         ret = -EINVAL;
2454                         if (strscpy(cfg.mcast_ifn, dm->mcast_ifn,
2455                                     sizeof(cfg.mcast_ifn)) <= 0)
2456                                 return ret;
2457                         cfg.syncid = dm->syncid;
2458                         ret = start_sync_thread(ipvs, &cfg, dm->state);
2459                 } else {
2460                         ret = stop_sync_thread(ipvs, dm->state);
2461                 }
2462                 return ret;
2463         }
2464 
2465         mutex_lock(&__ip_vs_mutex);
2466         if (cmd == IP_VS_SO_SET_FLUSH) {
2467                 /* Flush the virtual service */
2468                 ret = ip_vs_flush(ipvs, false);
2469                 goto out_unlock;
2470         } else if (cmd == IP_VS_SO_SET_TIMEOUT) {
2471                 /* Set timeout values for (tcp tcpfin udp) */
2472                 ret = ip_vs_set_timeout(ipvs, (struct ip_vs_timeout_user *)arg);
2473                 goto out_unlock;
2474         }
2475 
2476         usvc_compat = (struct ip_vs_service_user *)arg;
2477         udest_compat = (struct ip_vs_dest_user *)(usvc_compat + 1);
2478 
2479         /* We only use the new structs internally, so copy userspace compat
2480          * structs to extended internal versions */
2481         ip_vs_copy_usvc_compat(&usvc, usvc_compat);
2482         ip_vs_copy_udest_compat(&udest, udest_compat);
2483 
2484         if (cmd == IP_VS_SO_SET_ZERO) {
2485                 /* if no service address is set, zero counters in all */
2486                 if (!usvc.fwmark && !usvc.addr.ip && !usvc.port) {
2487                         ret = ip_vs_zero_all(ipvs);
2488                         goto out_unlock;
2489                 }
2490         }
2491 
2492         if ((cmd == IP_VS_SO_SET_ADD || cmd == IP_VS_SO_SET_EDIT) &&
2493             strnlen(usvc.sched_name, IP_VS_SCHEDNAME_MAXLEN) ==
2494             IP_VS_SCHEDNAME_MAXLEN) {
2495                 ret = -EINVAL;
2496                 goto out_unlock;
2497         }
2498 
2499         /* Check for valid protocol: TCP or UDP or SCTP, even for fwmark!=0 */
2500         if (usvc.protocol != IPPROTO_TCP && usvc.protocol != IPPROTO_UDP &&
2501             usvc.protocol != IPPROTO_SCTP) {
2502                 pr_err("set_ctl: invalid protocol: %d %pI4:%d\n",
2503                        usvc.protocol, &usvc.addr.ip,
2504                        ntohs(usvc.port));
2505                 ret = -EFAULT;
2506                 goto out_unlock;
2507         }
2508 
2509         /* Lookup the exact service by <protocol, addr, port> or fwmark */
2510         rcu_read_lock();
2511         if (usvc.fwmark == 0)
2512                 svc = __ip_vs_service_find(ipvs, usvc.af, usvc.protocol,
2513                                            &usvc.addr, usvc.port);
2514         else
2515                 svc = __ip_vs_svc_fwm_find(ipvs, usvc.af, usvc.fwmark);
2516         rcu_read_unlock();
2517 
2518         if (cmd != IP_VS_SO_SET_ADD
2519             && (svc == NULL || svc->protocol != usvc.protocol)) {
2520                 ret = -ESRCH;
2521                 goto out_unlock;
2522         }
2523 
2524         switch (cmd) {
2525         case IP_VS_SO_SET_ADD:
2526                 if (svc != NULL)
2527                         ret = -EEXIST;
2528                 else
2529                         ret = ip_vs_add_service(ipvs, &usvc, &svc);
2530                 break;
2531         case IP_VS_SO_SET_EDIT:
2532                 ret = ip_vs_edit_service(svc, &usvc);
2533                 break;
2534         case IP_VS_SO_SET_DEL:
2535                 ret = ip_vs_del_service(svc);
2536                 if (!ret)
2537                         goto out_unlock;
2538                 break;
2539         case IP_VS_SO_SET_ZERO:
2540                 ret = ip_vs_zero_service(svc);
2541                 break;
2542         case IP_VS_SO_SET_ADDDEST:
2543                 ret = ip_vs_add_dest(svc, &udest);
2544                 break;
2545         case IP_VS_SO_SET_EDITDEST:
2546                 ret = ip_vs_edit_dest(svc, &udest);
2547                 break;
2548         case IP_VS_SO_SET_DELDEST:
2549                 ret = ip_vs_del_dest(svc, &udest);
2550                 break;
2551         default:
2552                 ret = -EINVAL;
2553         }
2554 
2555   out_unlock:
2556         mutex_unlock(&__ip_vs_mutex);
2557         return ret;
2558 }
2559 
2560 
2561 static void
2562 ip_vs_copy_service(struct ip_vs_service_entry *dst, struct ip_vs_service *src)
2563 {
2564         struct ip_vs_scheduler *sched;
2565         struct ip_vs_kstats kstats;
2566         char *sched_name;
2567 
2568         sched = rcu_dereference_protected(src->scheduler, 1);
2569         sched_name = sched ? sched->name : "none";
2570         dst->protocol = src->protocol;
2571         dst->addr = src->addr.ip;
2572         dst->port = src->port;
2573         dst->fwmark = src->fwmark;
2574         strlcpy(dst->sched_name, sched_name, sizeof(dst->sched_name));
2575         dst->flags = src->flags;
2576         dst->timeout = src->timeout / HZ;
2577         dst->netmask = src->netmask;
2578         dst->num_dests = src->num_dests;
2579         ip_vs_copy_stats(&kstats, &src->stats);
2580         ip_vs_export_stats_user(&dst->stats, &kstats);
2581 }
2582 
2583 static inline int
2584 __ip_vs_get_service_entries(struct netns_ipvs *ipvs,
2585                             const struct ip_vs_get_services *get,
2586                             struct ip_vs_get_services __user *uptr)
2587 {
2588         int idx, count=0;
2589         struct ip_vs_service *svc;
2590         struct ip_vs_service_entry entry;
2591         int ret = 0;
2592 
2593         for (idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
2594                 hlist_for_each_entry(svc, &ip_vs_svc_table[idx], s_list) {
2595                         /* Only expose IPv4 entries to old interface */
2596                         if (svc->af != AF_INET || (svc->ipvs != ipvs))
2597                                 continue;
2598 
2599                         if (count >= get->num_services)
2600                                 goto out;
2601                         memset(&entry, 0, sizeof(entry));
2602                         ip_vs_copy_service(&entry, svc);
2603                         if (copy_to_user(&uptr->entrytable[count],
2604                                          &entry, sizeof(entry))) {
2605                                 ret = -EFAULT;
2606                                 goto out;
2607                         }
2608                         count++;
2609                 }
2610         }
2611 
2612         for (idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
2613                 hlist_for_each_entry(svc, &ip_vs_svc_fwm_table[idx], f_list) {
2614                         /* Only expose IPv4 entries to old interface */
2615                         if (svc->af != AF_INET || (svc->ipvs != ipvs))
2616                                 continue;
2617 
2618                         if (count >= get->num_services)
2619                                 goto out;
2620                         memset(&entry, 0, sizeof(entry));
2621                         ip_vs_copy_service(&entry, svc);
2622                         if (copy_to_user(&uptr->entrytable[count],
2623                                          &entry, sizeof(entry))) {
2624                                 ret = -EFAULT;
2625                                 goto out;
2626                         }
2627                         count++;
2628                 }
2629         }
2630 out:
2631         return ret;
2632 }
2633 
2634 static inline int
2635 __ip_vs_get_dest_entries(struct netns_ipvs *ipvs, const struct ip_vs_get_dests *get,
2636                          struct ip_vs_get_dests __user *uptr)
2637 {
2638         struct ip_vs_service *svc;
2639         union nf_inet_addr addr = { .ip = get->addr };
2640         int ret = 0;
2641 
2642         rcu_read_lock();
2643         if (get->fwmark)
2644                 svc = __ip_vs_svc_fwm_find(ipvs, AF_INET, get->fwmark);
2645         else
2646                 svc = __ip_vs_service_find(ipvs, AF_INET, get->protocol, &addr,
2647                                            get->port);
2648         rcu_read_unlock();
2649 
2650         if (svc) {
2651                 int count = 0;
2652                 struct ip_vs_dest *dest;
2653                 struct ip_vs_dest_entry entry;
2654                 struct ip_vs_kstats kstats;
2655 
2656                 memset(&entry, 0, sizeof(entry));
2657                 list_for_each_entry(dest, &svc->destinations, n_list) {
2658                         if (count >= get->num_dests)
2659                                 break;
2660 
2661                         /* Cannot expose heterogeneous members via sockopt
2662                          * interface
2663                          */
2664                         if (dest->af != svc->af)
2665                                 continue;
2666 
2667                         entry.addr = dest->addr.ip;
2668                         entry.port = dest->port;
2669                         entry.conn_flags = atomic_read(&dest->conn_flags);
2670                         entry.weight = atomic_read(&dest->weight);
2671                         entry.u_threshold = dest->u_threshold;
2672                         entry.l_threshold = dest->l_threshold;
2673                         entry.activeconns = atomic_read(&dest->activeconns);
2674                         entry.inactconns = atomic_read(&dest->inactconns);
2675                         entry.persistconns = atomic_read(&dest->persistconns);
2676                         ip_vs_copy_stats(&kstats, &dest->stats);
2677                         ip_vs_export_stats_user(&entry.stats, &kstats);
2678                         if (copy_to_user(&uptr->entrytable[count],
2679                                          &entry, sizeof(entry))) {
2680                                 ret = -EFAULT;
2681                                 break;
2682                         }
2683                         count++;
2684                 }
2685         } else
2686                 ret = -ESRCH;
2687         return ret;
2688 }
2689 
2690 static inline void
2691 __ip_vs_get_timeouts(struct netns_ipvs *ipvs, struct ip_vs_timeout_user *u)
2692 {
2693 #if defined(CONFIG_IP_VS_PROTO_TCP) || defined(CONFIG_IP_VS_PROTO_UDP)
2694         struct ip_vs_proto_data *pd;
2695 #endif
2696 
2697         memset(u, 0, sizeof (*u));
2698 
2699 #ifdef CONFIG_IP_VS_PROTO_TCP
2700         pd = ip_vs_proto_data_get(ipvs, IPPROTO_TCP);
2701         u->tcp_timeout = pd->timeout_table[IP_VS_TCP_S_ESTABLISHED] / HZ;
2702         u->tcp_fin_timeout = pd->timeout_table[IP_VS_TCP_S_FIN_WAIT] / HZ;
2703 #endif
2704 #ifdef CONFIG_IP_VS_PROTO_UDP
2705         pd = ip_vs_proto_data_get(ipvs, IPPROTO_UDP);
2706         u->udp_timeout =
2707                         pd->timeout_table[IP_VS_UDP_S_NORMAL] / HZ;
2708 #endif
2709 }
2710 
2711 static const unsigned char get_arglen[CMDID(IP_VS_SO_GET_MAX) + 1] = {
2712         [CMDID(IP_VS_SO_GET_VERSION)]  = 64,
2713         [CMDID(IP_VS_SO_GET_INFO)]     = sizeof(struct ip_vs_getinfo),
2714         [CMDID(IP_VS_SO_GET_SERVICES)] = sizeof(struct ip_vs_get_services),
2715         [CMDID(IP_VS_SO_GET_SERVICE)]  = sizeof(struct ip_vs_service_entry),
2716         [CMDID(IP_VS_SO_GET_DESTS)]    = sizeof(struct ip_vs_get_dests),
2717         [CMDID(IP_VS_SO_GET_TIMEOUT)]  = sizeof(struct ip_vs_timeout_user),
2718         [CMDID(IP_VS_SO_GET_DAEMON)]   = 2 * sizeof(struct ip_vs_daemon_user),
2719 };
2720 
2721 union ip_vs_get_arglen {
2722         char                            field_IP_VS_SO_GET_VERSION[64];
2723         struct ip_vs_getinfo            field_IP_VS_SO_GET_INFO;
2724         struct ip_vs_get_services       field_IP_VS_SO_GET_SERVICES;
2725         struct ip_vs_service_entry      field_IP_VS_SO_GET_SERVICE;
2726         struct ip_vs_get_dests          field_IP_VS_SO_GET_DESTS;
2727         struct ip_vs_timeout_user       field_IP_VS_SO_GET_TIMEOUT;
2728         struct ip_vs_daemon_user        field_IP_VS_SO_GET_DAEMON[2];
2729 };
2730 
2731 #define MAX_GET_ARGLEN  sizeof(union ip_vs_get_arglen)
2732 
2733 static int
2734 do_ip_vs_get_ctl(struct sock *sk, int cmd, void __user *user, int *len)
2735 {
2736         unsigned char arg[MAX_GET_ARGLEN];
2737         int ret = 0;
2738         unsigned int copylen;
2739         struct net *net = sock_net(sk);
2740         struct netns_ipvs *ipvs = net_ipvs(net);
2741 
2742         BUG_ON(!net);
2743         BUILD_BUG_ON(sizeof(arg) > 255);
2744         if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
2745                 return -EPERM;
2746 
2747         if (cmd < IP_VS_BASE_CTL || cmd > IP_VS_SO_GET_MAX)
2748                 return -EINVAL;
2749 
2750         copylen = get_arglen[CMDID(cmd)];
2751         if (*len < (int) copylen) {
2752                 IP_VS_DBG(1, "get_ctl: len %d < %u\n", *len, copylen);
2753                 return -EINVAL;
2754         }
2755 
2756         if (copy_from_user(arg, user, copylen) != 0)
2757                 return -EFAULT;
2758         /*
2759          * Handle daemons first since it has its own locking
2760          */
2761         if (cmd == IP_VS_SO_GET_DAEMON) {
2762                 struct ip_vs_daemon_user d[2];
2763 
2764                 memset(&d, 0, sizeof(d));
2765                 mutex_lock(&ipvs->sync_mutex);
2766                 if (ipvs->sync_state & IP_VS_STATE_MASTER) {
2767                         d[0].state = IP_VS_STATE_MASTER;
2768                         strlcpy(d[0].mcast_ifn, ipvs->mcfg.mcast_ifn,
2769                                 sizeof(d[0].mcast_ifn));
2770                         d[0].syncid = ipvs->mcfg.syncid;
2771                 }
2772                 if (ipvs->sync_state & IP_VS_STATE_BACKUP) {
2773                         d[1].state = IP_VS_STATE_BACKUP;
2774                         strlcpy(d[1].mcast_ifn, ipvs->bcfg.mcast_ifn,
2775                                 sizeof(d[1].mcast_ifn));
2776                         d[1].syncid = ipvs->bcfg.syncid;
2777                 }
2778                 if (copy_to_user(user, &d, sizeof(d)) != 0)
2779                         ret = -EFAULT;
2780                 mutex_unlock(&ipvs->sync_mutex);
2781                 return ret;
2782         }
2783 
2784         mutex_lock(&__ip_vs_mutex);
2785         switch (cmd) {
2786         case IP_VS_SO_GET_VERSION:
2787         {
2788                 char buf[64];
2789 
2790                 sprintf(buf, "IP Virtual Server version %d.%d.%d (size=%d)",
2791                         NVERSION(IP_VS_VERSION_CODE), ip_vs_conn_tab_size);
2792                 if (copy_to_user(user, buf, strlen(buf)+1) != 0) {
2793                         ret = -EFAULT;
2794                         goto out;
2795                 }
2796                 *len = strlen(buf)+1;
2797         }
2798         break;
2799 
2800         case IP_VS_SO_GET_INFO:
2801         {
2802                 struct ip_vs_getinfo info;
2803                 info.version = IP_VS_VERSION_CODE;
2804                 info.size = ip_vs_conn_tab_size;
2805                 info.num_services = ipvs->num_services;
2806                 if (copy_to_user(user, &info, sizeof(info)) != 0)
2807                         ret = -EFAULT;
2808         }
2809         break;
2810 
2811         case IP_VS_SO_GET_SERVICES:
2812         {
2813                 struct ip_vs_get_services *get;
2814                 int size;
2815 
2816                 get = (struct ip_vs_get_services *)arg;
2817                 size = struct_size(get, entrytable, get->num_services);
2818                 if (*len != size) {
2819                         pr_err("length: %u != %u\n", *len, size);
2820                         ret = -EINVAL;
2821                         goto out;
2822                 }
2823                 ret = __ip_vs_get_service_entries(ipvs, get, user);
2824         }
2825         break;
2826 
2827         case IP_VS_SO_GET_SERVICE:
2828         {
2829                 struct ip_vs_service_entry *entry;
2830                 struct ip_vs_service *svc;
2831                 union nf_inet_addr addr;
2832 
2833                 entry = (struct ip_vs_service_entry *)arg;
2834                 addr.ip = entry->addr;
2835                 rcu_read_lock();
2836                 if (entry->fwmark)
2837                         svc = __ip_vs_svc_fwm_find(ipvs, AF_INET, entry->fwmark);
2838                 else
2839                         svc = __ip_vs_service_find(ipvs, AF_INET,
2840                                                    entry->protocol, &addr,
2841                                                    entry->port);
2842                 rcu_read_unlock();
2843                 if (svc) {
2844                         ip_vs_copy_service(entry, svc);
2845                         if (copy_to_user(user, entry, sizeof(*entry)) != 0)
2846                                 ret = -EFAULT;
2847                 } else
2848                         ret = -ESRCH;
2849         }
2850         break;
2851 
2852         case IP_VS_SO_GET_DESTS:
2853         {
2854                 struct ip_vs_get_dests *get;
2855                 int size;
2856 
2857                 get = (struct ip_vs_get_dests *)arg;
2858                 size = struct_size(get, entrytable, get->num_dests);
2859                 if (*len != size) {
2860                         pr_err("length: %u != %u\n", *len, size);
2861                         ret = -EINVAL;
2862                         goto out;
2863                 }
2864                 ret = __ip_vs_get_dest_entries(ipvs, get, user);
2865         }
2866         break;
2867 
2868         case IP_VS_SO_GET_TIMEOUT:
2869         {
2870                 struct ip_vs_timeout_user t;
2871 
2872                 __ip_vs_get_timeouts(ipvs, &t);
2873                 if (copy_to_user(user, &t, sizeof(t)) != 0)
2874                         ret = -EFAULT;
2875         }
2876         break;
2877 
2878         default:
2879                 ret = -EINVAL;
2880         }
2881 
2882 out:
2883         mutex_unlock(&__ip_vs_mutex);
2884         return ret;
2885 }
2886 
2887 
2888 static struct nf_sockopt_ops ip_vs_sockopts = {
2889         .pf             = PF_INET,
2890         .set_optmin     = IP_VS_BASE_CTL,
2891         .set_optmax     = IP_VS_SO_SET_MAX+1,
2892         .set            = do_ip_vs_set_ctl,
2893         .get_optmin     = IP_VS_BASE_CTL,
2894         .get_optmax     = IP_VS_SO_GET_MAX+1,
2895         .get            = do_ip_vs_get_ctl,
2896         .owner          = THIS_MODULE,
2897 };
2898 
2899 /*
2900  * Generic Netlink interface
2901  */
2902 
2903 /* IPVS genetlink family */
2904 static struct genl_family ip_vs_genl_family;
2905 
2906 /* Policy used for first-level command attributes */
2907 static const struct nla_policy ip_vs_cmd_policy[IPVS_CMD_ATTR_MAX + 1] = {
2908         [IPVS_CMD_ATTR_SERVICE]         = { .type = NLA_NESTED },
2909         [IPVS_CMD_ATTR_DEST]            = { .type = NLA_NESTED },
2910         [IPVS_CMD_ATTR_DAEMON]          = { .type = NLA_NESTED },
2911         [IPVS_CMD_ATTR_TIMEOUT_TCP]     = { .type = NLA_U32 },
2912         [IPVS_CMD_ATTR_TIMEOUT_TCP_FIN] = { .type = NLA_U32 },
2913         [IPVS_CMD_ATTR_TIMEOUT_UDP]     = { .type = NLA_U32 },
2914 };
2915 
2916 /* Policy used for attributes in nested attribute IPVS_CMD_ATTR_DAEMON */
2917 static const struct nla_policy ip_vs_daemon_policy[IPVS_DAEMON_ATTR_MAX + 1] = {
2918         [IPVS_DAEMON_ATTR_STATE]        = { .type = NLA_U32 },
2919         [IPVS_DAEMON_ATTR_MCAST_IFN]    = { .type = NLA_NUL_STRING,
2920                                             .len = IP_VS_IFNAME_MAXLEN - 1 },
2921         [IPVS_DAEMON_ATTR_SYNC_ID]      = { .type = NLA_U32 },
2922         [IPVS_DAEMON_ATTR_SYNC_MAXLEN]  = { .type = NLA_U16 },
2923         [IPVS_DAEMON_ATTR_MCAST_GROUP]  = { .type = NLA_U32 },
2924         [IPVS_DAEMON_ATTR_MCAST_GROUP6] = { .len = sizeof(struct in6_addr) },
2925         [IPVS_DAEMON_ATTR_MCAST_PORT]   = { .type = NLA_U16 },
2926         [IPVS_DAEMON_ATTR_MCAST_TTL]    = { .type = NLA_U8 },
2927 };
2928 
2929 /* Policy used for attributes in nested attribute IPVS_CMD_ATTR_SERVICE */
2930 static const struct nla_policy ip_vs_svc_policy[IPVS_SVC_ATTR_MAX + 1] = {
2931         [IPVS_SVC_ATTR_AF]              = { .type = NLA_U16 },
2932         [IPVS_SVC_ATTR_PROTOCOL]        = { .type = NLA_U16 },
2933         [IPVS_SVC_ATTR_ADDR]            = { .type = NLA_BINARY,
2934                                             .len = sizeof(union nf_inet_addr) },
2935         [IPVS_SVC_ATTR_PORT]            = { .type = NLA_U16 },
2936         [IPVS_SVC_ATTR_FWMARK]          = { .type = NLA_U32 },
2937         [IPVS_SVC_ATTR_SCHED_NAME]      = { .type = NLA_NUL_STRING,
2938                                             .len = IP_VS_SCHEDNAME_MAXLEN - 1 },
2939         [IPVS_SVC_ATTR_PE_NAME]         = { .type = NLA_NUL_STRING,
2940                                             .len = IP_VS_PENAME_MAXLEN },
2941         [IPVS_SVC_ATTR_FLAGS]           = { .type = NLA_BINARY,
2942                                             .len = sizeof(struct ip_vs_flags) },
2943         [IPVS_SVC_ATTR_TIMEOUT]         = { .type = NLA_U32 },
2944         [IPVS_SVC_ATTR_NETMASK]         = { .type = NLA_U32 },
2945         [IPVS_SVC_ATTR_STATS]           = { .type = NLA_NESTED },
2946 };
2947 
2948 /* Policy used for attributes in nested attribute IPVS_CMD_ATTR_DEST */
2949 static const struct nla_policy ip_vs_dest_policy[IPVS_DEST_ATTR_MAX + 1] = {
2950         [IPVS_DEST_ATTR_ADDR]           = { .type = NLA_BINARY,
2951                                             .len = sizeof(union nf_inet_addr) },
2952         [IPVS_DEST_ATTR_PORT]           = { .type = NLA_U16 },
2953         [IPVS_DEST_ATTR_FWD_METHOD]     = { .type = NLA_U32 },
2954         [IPVS_DEST_ATTR_WEIGHT]         = { .type = NLA_U32 },
2955         [IPVS_DEST_ATTR_U_THRESH]       = { .type = NLA_U32 },
2956         [IPVS_DEST_ATTR_L_THRESH]       = { .type = NLA_U32 },
2957         [IPVS_DEST_ATTR_ACTIVE_CONNS]   = { .type = NLA_U32 },
2958         [IPVS_DEST_ATTR_INACT_CONNS]    = { .type = NLA_U32 },
2959         [IPVS_DEST_ATTR_PERSIST_CONNS]  = { .type = NLA_U32 },
2960         [IPVS_DEST_ATTR_STATS]          = { .type = NLA_NESTED },
2961         [IPVS_DEST_ATTR_ADDR_FAMILY]    = { .type = NLA_U16 },
2962         [IPVS_DEST_ATTR_TUN_TYPE]       = { .type = NLA_U8 },
2963         [IPVS_DEST_ATTR_TUN_PORT]       = { .type = NLA_U16 },
2964         [IPVS_DEST_ATTR_TUN_FLAGS]      = { .type = NLA_U16 },
2965 };
2966 
2967 static int ip_vs_genl_fill_stats(struct sk_buff *skb, int container_type,
2968                                  struct ip_vs_kstats *kstats)
2969 {
2970         struct nlattr *nl_stats = nla_nest_start_noflag(skb, container_type);
2971 
2972         if (!nl_stats)
2973                 return -EMSGSIZE;
2974 
2975         if (nla_put_u32(skb, IPVS_STATS_ATTR_CONNS, (u32)kstats->conns) ||
2976             nla_put_u32(skb, IPVS_STATS_ATTR_INPKTS, (u32)kstats->inpkts) ||
2977             nla_put_u32(skb, IPVS_STATS_ATTR_OUTPKTS, (u32)kstats->outpkts) ||
2978             nla_put_u64_64bit(skb, IPVS_STATS_ATTR_INBYTES, kstats->inbytes,
2979                               IPVS_STATS_ATTR_PAD) ||
2980             nla_put_u64_64bit(skb, IPVS_STATS_ATTR_OUTBYTES, kstats->outbytes,
2981                               IPVS_STATS_ATTR_PAD) ||
2982             nla_put_u32(skb, IPVS_STATS_ATTR_CPS, (u32)kstats->cps) ||
2983             nla_put_u32(skb, IPVS_STATS_ATTR_INPPS, (u32)kstats->inpps) ||
2984             nla_put_u32(skb, IPVS_STATS_ATTR_OUTPPS, (u32)kstats->outpps) ||
2985             nla_put_u32(skb, IPVS_STATS_ATTR_INBPS, (u32)kstats->inbps) ||
2986             nla_put_u32(skb, IPVS_STATS_ATTR_OUTBPS, (u32)kstats->outbps))
2987                 goto nla_put_failure;
2988         nla_nest_end(skb, nl_stats);
2989 
2990         return 0;
2991 
2992 nla_put_failure:
2993         nla_nest_cancel(skb, nl_stats);
2994         return -EMSGSIZE;
2995 }
2996 
2997 static int ip_vs_genl_fill_stats64(struct sk_buff *skb, int container_type,
2998                                    struct ip_vs_kstats *kstats)
2999 {
3000         struct nlattr *nl_stats = nla_nest_start_noflag(skb, container_type);
3001 
3002         if (!nl_stats)
3003                 return -EMSGSIZE;
3004 
3005         if (nla_put_u64_64bit(skb, IPVS_STATS_ATTR_CONNS, kstats->conns,
3006                               IPVS_STATS_ATTR_PAD) ||
3007             nla_put_u64_64bit(skb, IPVS_STATS_ATTR_INPKTS, kstats->inpkts,
3008                               IPVS_STATS_ATTR_PAD) ||
3009             nla_put_u64_64bit(skb, IPVS_STATS_ATTR_OUTPKTS, kstats->outpkts,
3010                               IPVS_STATS_ATTR_PAD) ||
3011             nla_put_u64_64bit(skb, IPVS_STATS_ATTR_INBYTES, kstats->inbytes,
3012                               IPVS_STATS_ATTR_PAD) ||
3013             nla_put_u64_64bit(skb, IPVS_STATS_ATTR_OUTBYTES, kstats->outbytes,
3014                               IPVS_STATS_ATTR_PAD) ||
3015             nla_put_u64_64bit(skb, IPVS_STATS_ATTR_CPS, kstats->cps,
3016                               IPVS_STATS_ATTR_PAD) ||
3017             nla_put_u64_64bit(skb, IPVS_STATS_ATTR_INPPS, kstats->inpps,
3018                               IPVS_STATS_ATTR_PAD) ||
3019             nla_put_u64_64bit(skb, IPVS_STATS_ATTR_OUTPPS, kstats->outpps,
3020                               IPVS_STATS_ATTR_PAD) ||
3021             nla_put_u64_64bit(skb, IPVS_STATS_ATTR_INBPS, kstats->inbps,
3022                               IPVS_STATS_ATTR_PAD) ||
3023             nla_put_u64_64bit(skb, IPVS_STATS_ATTR_OUTBPS, kstats->outbps,
3024                               IPVS_STATS_ATTR_PAD))
3025                 goto nla_put_failure;
3026         nla_nest_end(skb, nl_stats);
3027 
3028         return 0;
3029 
3030 nla_put_failure:
3031         nla_nest_cancel(skb, nl_stats);
3032         return -EMSGSIZE;
3033 }
3034 
3035 static int ip_vs_genl_fill_service(struct sk_buff *skb,
3036                                    struct ip_vs_service *svc)
3037 {
3038         struct ip_vs_scheduler *sched;
3039         struct ip_vs_pe *pe;
3040         struct nlattr *nl_service;
3041         struct ip_vs_flags flags = { .flags = svc->flags,
3042                                      .mask = ~0 };
3043         struct ip_vs_kstats kstats;
3044         char *sched_name;
3045 
3046         nl_service = nla_nest_start_noflag(skb, IPVS_CMD_ATTR_SERVICE);
3047         if (!nl_service)
3048                 return -EMSGSIZE;
3049 
3050         if (nla_put_u16(skb, IPVS_SVC_ATTR_AF, svc->af))
3051                 goto nla_put_failure;
3052         if (svc->fwmark) {
3053                 if (nla_put_u32(skb, IPVS_SVC_ATTR_FWMARK, svc->fwmark))
3054                         goto nla_put_failure;
3055         } else {
3056                 if (nla_put_u16(skb, IPVS_SVC_ATTR_PROTOCOL, svc->protocol) ||
3057                     nla_put(skb, IPVS_SVC_ATTR_ADDR, sizeof(svc->addr), &svc->addr) ||
3058                     nla_put_be16(skb, IPVS_SVC_ATTR_PORT, svc->port))
3059                         goto nla_put_failure;
3060         }
3061 
3062         sched = rcu_dereference_protected(svc->scheduler, 1);
3063         sched_name = sched ? sched->name : "none";
3064         pe = rcu_dereference_protected(svc->pe, 1);
3065         if (nla_put_string(skb, IPVS_SVC_ATTR_SCHED_NAME, sched_name) ||
3066             (pe && nla_put_string(skb, IPVS_SVC_ATTR_PE_NAME, pe->name)) ||
3067             nla_put(skb, IPVS_SVC_ATTR_FLAGS, sizeof(flags), &flags) ||
3068             nla_put_u32(skb, IPVS_SVC_ATTR_TIMEOUT, svc->timeout / HZ) ||
3069             nla_put_be32(skb, IPVS_SVC_ATTR_NETMASK, svc->netmask))
3070                 goto nla_put_failure;
3071         ip_vs_copy_stats(&kstats, &svc->stats);
3072         if (ip_vs_genl_fill_stats(skb, IPVS_SVC_ATTR_STATS, &kstats))
3073                 goto nla_put_failure;
3074         if (ip_vs_genl_fill_stats64(skb, IPVS_SVC_ATTR_STATS64, &kstats))
3075                 goto nla_put_failure;
3076 
3077         nla_nest_end(skb, nl_service);
3078 
3079         return 0;
3080 
3081 nla_put_failure:
3082         nla_nest_cancel(skb, nl_service);
3083         return -EMSGSIZE;
3084 }
3085 
3086 static int ip_vs_genl_dump_service(struct sk_buff *skb,
3087                                    struct ip_vs_service *svc,
3088                                    struct netlink_callback *cb)
3089 {
3090         void *hdr;
3091 
3092         hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
3093                           &ip_vs_genl_family, NLM_F_MULTI,
3094                           IPVS_CMD_NEW_SERVICE);
3095         if (!hdr)
3096                 return -EMSGSIZE;
3097 
3098         if (ip_vs_genl_fill_service(skb, svc) < 0)
3099                 goto nla_put_failure;
3100 
3101         genlmsg_end(skb, hdr);
3102         return 0;
3103 
3104 nla_put_failure:
3105         genlmsg_cancel(skb, hdr);
3106         return -EMSGSIZE;
3107 }
3108 
3109 static int ip_vs_genl_dump_services(struct sk_buff *skb,
3110                                     struct netlink_callback *cb)
3111 {
3112         int idx = 0, i;
3113         int start = cb->args[0];
3114         struct ip_vs_service *svc;
3115         struct net *net = sock_net(skb->sk);
3116         struct netns_ipvs *ipvs = net_ipvs(net);
3117 
3118         mutex_lock(&__ip_vs_mutex);
3119         for (i = 0; i < IP_VS_SVC_TAB_SIZE; i++) {
3120                 hlist_for_each_entry(svc, &ip_vs_svc_table[i], s_list) {
3121                         if (++idx <= start || (svc->ipvs != ipvs))
3122                                 continue;
3123                         if (ip_vs_genl_dump_service(skb, svc, cb) < 0) {
3124                                 idx--;
3125                                 goto nla_put_failure;
3126                         }
3127                 }
3128         }
3129 
3130         for (i = 0; i < IP_VS_SVC_TAB_SIZE; i++) {
3131                 hlist_for_each_entry(svc, &ip_vs_svc_fwm_table[i], f_list) {
3132                         if (++idx <= start || (svc->ipvs != ipvs))
3133                                 continue;
3134                         if (ip_vs_genl_dump_service(skb, svc, cb) < 0) {
3135                                 idx--;
3136                                 goto nla_put_failure;
3137                         }
3138                 }
3139         }
3140 
3141 nla_put_failure:
3142         mutex_unlock(&__ip_vs_mutex);
3143         cb->args[0] = idx;
3144 
3145         return skb->len;
3146 }
3147 
3148 static bool ip_vs_is_af_valid(int af)
3149 {
3150         if (af == AF_INET)
3151                 return true;
3152 #ifdef CONFIG_IP_VS_IPV6
3153         if (af == AF_INET6 && ipv6_mod_enabled())
3154                 return true;
3155 #endif
3156         return false;
3157 }
3158 
3159 static int ip_vs_genl_parse_service(struct netns_ipvs *ipvs,
3160                                     struct ip_vs_service_user_kern *usvc,
3161                                     struct nlattr *nla, bool full_entry,
3162                                     struct ip_vs_service **ret_svc)
3163 {
3164         struct nlattr *attrs[IPVS_SVC_ATTR_MAX + 1];
3165         struct nlattr *nla_af, *nla_port, *nla_fwmark, *nla_protocol, *nla_addr;
3166         struct ip_vs_service *svc;
3167 
3168         /* Parse mandatory identifying service fields first */
3169         if (nla == NULL ||
3170             nla_parse_nested_deprecated(attrs, IPVS_SVC_ATTR_MAX, nla, ip_vs_svc_policy, NULL))
3171                 return -EINVAL;
3172 
3173         nla_af          = attrs[IPVS_SVC_ATTR_AF];
3174         nla_protocol    = attrs[IPVS_SVC_ATTR_PROTOCOL];
3175         nla_addr        = attrs[IPVS_SVC_ATTR_ADDR];
3176         nla_port        = attrs[IPVS_SVC_ATTR_PORT];
3177         nla_fwmark      = attrs[IPVS_SVC_ATTR_FWMARK];
3178 
3179         if (!(nla_af && (nla_fwmark || (nla_port && nla_protocol && nla_addr))))
3180                 return -EINVAL;
3181 
3182         memset(usvc, 0, sizeof(*usvc));
3183 
3184         usvc->af = nla_get_u16(nla_af);
3185         if (!ip_vs_is_af_valid(usvc->af))
3186                 return -EAFNOSUPPORT;
3187 
3188         if (nla_fwmark) {
3189                 usvc->protocol = IPPROTO_TCP;
3190                 usvc->fwmark = nla_get_u32(nla_fwmark);
3191         } else {
3192                 usvc->protocol = nla_get_u16(nla_protocol);
3193                 nla_memcpy(&usvc->addr, nla_addr, sizeof(usvc->addr));
3194                 usvc->port = nla_get_be16(nla_port);
3195                 usvc->fwmark = 0;
3196         }
3197 
3198         rcu_read_lock();
3199         if (usvc->fwmark)
3200                 svc = __ip_vs_svc_fwm_find(ipvs, usvc->af, usvc->fwmark);
3201         else
3202                 svc = __ip_vs_service_find(ipvs, usvc->af, usvc->protocol,
3203                                            &usvc->addr, usvc->port);
3204         rcu_read_unlock();
3205         *ret_svc = svc;
3206 
3207         /* If a full entry was requested, check for the additional fields */
3208         if (full_entry) {
3209                 struct nlattr *nla_sched, *nla_flags, *nla_pe, *nla_timeout,
3210                               *nla_netmask;
3211                 struct ip_vs_flags flags;
3212 
3213                 nla_sched = attrs[IPVS_SVC_ATTR_SCHED_NAME];
3214                 nla_pe = attrs[IPVS_SVC_ATTR_PE_NAME];
3215                 nla_flags = attrs[IPVS_SVC_ATTR_FLAGS];
3216                 nla_timeout = attrs[IPVS_SVC_ATTR_TIMEOUT];
3217                 nla_netmask = attrs[IPVS_SVC_ATTR_NETMASK];
3218 
3219                 if (!(nla_sched && nla_flags && nla_timeout && nla_netmask))
3220                         return -EINVAL;
3221 
3222                 nla_memcpy(&flags, nla_flags, sizeof(flags));
3223 
3224                 /* prefill flags from service if it already exists */
3225                 if (svc)
3226                         usvc->flags = svc->flags;
3227 
3228                 /* set new flags from userland */
3229                 usvc->flags = (usvc->flags & ~flags.mask) |
3230                               (flags.flags & flags.mask);
3231                 usvc->sched_name = nla_data(nla_sched);
3232                 usvc->pe_name = nla_pe ? nla_data(nla_pe) : NULL;
3233                 usvc->timeout = nla_get_u32(nla_timeout);
3234                 usvc->netmask = nla_get_be32(nla_netmask);
3235         }
3236 
3237         return 0;
3238 }
3239 
3240 static struct ip_vs_service *ip_vs_genl_find_service(struct netns_ipvs *ipvs,
3241                                                      struct nlattr *nla)
3242 {
3243         struct ip_vs_service_user_kern usvc;
3244         struct ip_vs_service *svc;
3245         int ret;
3246 
3247         ret = ip_vs_genl_parse_service(ipvs, &usvc, nla, false, &svc);
3248         return ret ? ERR_PTR(ret) : svc;
3249 }
3250 
3251 static int ip_vs_genl_fill_dest(struct sk_buff *skb, struct ip_vs_dest *dest)
3252 {
3253         struct nlattr *nl_dest;
3254         struct ip_vs_kstats kstats;
3255 
3256         nl_dest = nla_nest_start_noflag(skb, IPVS_CMD_ATTR_DEST);
3257         if (!nl_dest)
3258                 return -EMSGSIZE;
3259 
3260         if (nla_put(skb, IPVS_DEST_ATTR_ADDR, sizeof(dest->addr), &dest->addr) ||
3261             nla_put_be16(skb, IPVS_DEST_ATTR_PORT, dest->port) ||
3262             nla_put_u32(skb, IPVS_DEST_ATTR_FWD_METHOD,
3263                         (atomic_read(&dest->conn_flags) &
3264                          IP_VS_CONN_F_FWD_MASK)) ||
3265             nla_put_u32(skb, IPVS_DEST_ATTR_WEIGHT,
3266                         atomic_read(&dest->weight)) ||
3267             nla_put_u8(skb, IPVS_DEST_ATTR_TUN_TYPE,
3268                        dest->tun_type) ||
3269             nla_put_be16(skb, IPVS_DEST_ATTR_TUN_PORT,
3270                          dest->tun_port) ||
3271             nla_put_u16(skb, IPVS_DEST_ATTR_TUN_FLAGS,
3272                         dest->tun_flags) ||
3273             nla_put_u32(skb, IPVS_DEST_ATTR_U_THRESH, dest->u_threshold) ||
3274             nla_put_u32(skb, IPVS_DEST_ATTR_L_THRESH, dest->l_threshold) ||
3275             nla_put_u32(skb, IPVS_DEST_ATTR_ACTIVE_CONNS,
3276                         atomic_read(&dest->activeconns)) ||
3277             nla_put_u32(skb, IPVS_DEST_ATTR_INACT_CONNS,
3278                         atomic_read(&dest->inactconns)) ||
3279             nla_put_u32(skb, IPVS_DEST_ATTR_PERSIST_CONNS,
3280                         atomic_read(&dest->persistconns)) ||
3281             nla_put_u16(skb, IPVS_DEST_ATTR_ADDR_FAMILY, dest->af))
3282                 goto nla_put_failure;
3283         ip_vs_copy_stats(&kstats, &dest->stats);
3284         if (ip_vs_genl_fill_stats(skb, IPVS_DEST_ATTR_STATS, &kstats))
3285                 goto nla_put_failure;
3286         if (ip_vs_genl_fill_stats64(skb, IPVS_DEST_ATTR_STATS64, &kstats))
3287                 goto nla_put_failure;
3288 
3289         nla_nest_end(skb, nl_dest);
3290 
3291         return 0;
3292 
3293 nla_put_failure:
3294         nla_nest_cancel(skb, nl_dest);
3295         return -EMSGSIZE;
3296 }
3297 
3298 static int ip_vs_genl_dump_dest(struct sk_buff *skb, struct ip_vs_dest *dest,
3299                                 struct netlink_callback *cb)
3300 {
3301         void *hdr;
3302 
3303         hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
3304                           &ip_vs_genl_family, NLM_F_MULTI,
3305                           IPVS_CMD_NEW_DEST);
3306         if (!hdr)
3307                 return -EMSGSIZE;
3308 
3309         if (ip_vs_genl_fill_dest(skb, dest) < 0)
3310                 goto nla_put_failure;
3311 
3312         genlmsg_end(skb, hdr);
3313         return 0;
3314 
3315 nla_put_failure:
3316         genlmsg_cancel(skb, hdr);
3317         return -EMSGSIZE;
3318 }
3319 
3320 static int ip_vs_genl_dump_dests(struct sk_buff *skb,
3321                                  struct netlink_callback *cb)
3322 {
3323         int idx = 0;
3324         int start = cb->args[0];
3325         struct ip_vs_service *svc;
3326         struct ip_vs_dest *dest;
3327         struct nlattr *attrs[IPVS_CMD_ATTR_MAX + 1];
3328         struct net *net = sock_net(skb->sk);
3329         struct netns_ipvs *ipvs = net_ipvs(net);
3330 
3331         mutex_lock(&__ip_vs_mutex);
3332 
3333         /* Try to find the service for which to dump destinations */
3334         if (nlmsg_parse_deprecated(cb->nlh, GENL_HDRLEN, attrs, IPVS_CMD_ATTR_MAX, ip_vs_cmd_policy, cb->extack))
3335                 goto out_err;
3336 
3337 
3338         svc = ip_vs_genl_find_service(ipvs, attrs[IPVS_CMD_ATTR_SERVICE]);
3339         if (IS_ERR_OR_NULL(svc))
3340                 goto out_err;
3341 
3342         /* Dump the destinations */
3343         list_for_each_entry(dest, &svc->destinations, n_list) {
3344                 if (++idx <= start)
3345                         continue;
3346                 if (ip_vs_genl_dump_dest(skb, dest, cb) < 0) {
3347                         idx--;
3348                         goto nla_put_failure;
3349                 }
3350         }
3351 
3352 nla_put_failure:
3353         cb->args[0] = idx;
3354 
3355 out_err:
3356         mutex_unlock(&__ip_vs_mutex);
3357 
3358         return skb->len;
3359 }
3360 
3361 static int ip_vs_genl_parse_dest(struct ip_vs_dest_user_kern *udest,
3362                                  struct nlattr *nla, bool full_entry)
3363 {
3364         struct nlattr *attrs[IPVS_DEST_ATTR_MAX + 1];
3365         struct nlattr *nla_addr, *nla_port;
3366         struct nlattr *nla_addr_family;
3367 
3368         /* Parse mandatory identifying destination fields first */
3369         if (nla == NULL ||
3370             nla_parse_nested_deprecated(attrs, IPVS_DEST_ATTR_MAX, nla, ip_vs_dest_policy, NULL))
3371                 return -EINVAL;
3372 
3373         nla_addr        = attrs[IPVS_DEST_ATTR_ADDR];
3374         nla_port        = attrs[IPVS_DEST_ATTR_PORT];
3375         nla_addr_family = attrs[IPVS_DEST_ATTR_ADDR_FAMILY];
3376 
3377         if (!(nla_addr && nla_port))
3378                 return -EINVAL;
3379 
3380         memset(udest, 0, sizeof(*udest));
3381 
3382         nla_memcpy(&udest->addr, nla_addr, sizeof(udest->addr));
3383         udest->port = nla_get_be16(nla_port);
3384 
3385         if (nla_addr_family)
3386                 udest->af = nla_get_u16(nla_addr_family);
3387         else
3388                 udest->af = 0;
3389 
3390         /* If a full entry was requested, check for the additional fields */
3391         if (full_entry) {
3392                 struct nlattr *nla_fwd, *nla_weight, *nla_u_thresh,
3393                               *nla_l_thresh, *nla_tun_type, *nla_tun_port,
3394                               *nla_tun_flags;
3395 
3396                 nla_fwd         = attrs[IPVS_DEST_ATTR_FWD_METHOD];
3397                 nla_weight      = attrs[IPVS_DEST_ATTR_WEIGHT];
3398                 nla_u_thresh    = attrs[IPVS_DEST_ATTR_U_THRESH];
3399                 nla_l_thresh    = attrs[IPVS_DEST_ATTR_L_THRESH];
3400                 nla_tun_type    = attrs[IPVS_DEST_ATTR_TUN_TYPE];
3401                 nla_tun_port    = attrs[IPVS_DEST_ATTR_TUN_PORT];
3402                 nla_tun_flags   = attrs[IPVS_DEST_ATTR_TUN_FLAGS];
3403 
3404                 if (!(nla_fwd && nla_weight && nla_u_thresh && nla_l_thresh))
3405                         return -EINVAL;
3406 
3407                 udest->conn_flags = nla_get_u32(nla_fwd)
3408                                     & IP_VS_CONN_F_FWD_MASK;
3409                 udest->weight = nla_get_u32(nla_weight);
3410                 udest->u_threshold = nla_get_u32(nla_u_thresh);
3411                 udest->l_threshold = nla_get_u32(nla_l_thresh);
3412 
3413                 if (nla_tun_type)
3414                         udest->tun_type = nla_get_u8(nla_tun_type);
3415 
3416                 if (nla_tun_port)
3417                         udest->tun_port = nla_get_be16(nla_tun_port);
3418 
3419                 if (nla_tun_flags)
3420                         udest->tun_flags = nla_get_u16(nla_tun_flags);
3421         }
3422 
3423         return 0;
3424 }
3425 
3426 static int ip_vs_genl_fill_daemon(struct sk_buff *skb, __u32 state,
3427                                   struct ipvs_sync_daemon_cfg *c)
3428 {
3429         struct nlattr *nl_daemon;
3430 
3431         nl_daemon = nla_nest_start_noflag(skb, IPVS_CMD_ATTR_DAEMON);
3432         if (!nl_daemon)
3433                 return -EMSGSIZE;
3434 
3435         if (nla_put_u32(skb, IPVS_DAEMON_ATTR_STATE, state) ||
3436             nla_put_string(skb, IPVS_DAEMON_ATTR_MCAST_IFN, c->mcast_ifn) ||
3437             nla_put_u32(skb, IPVS_DAEMON_ATTR_SYNC_ID, c->syncid) ||
3438             nla_put_u16(skb, IPVS_DAEMON_ATTR_SYNC_MAXLEN, c->sync_maxlen) ||
3439             nla_put_u16(skb, IPVS_DAEMON_ATTR_MCAST_PORT, c->mcast_port) ||
3440             nla_put_u8(skb, IPVS_DAEMON_ATTR_MCAST_TTL, c->mcast_ttl))
3441                 goto nla_put_failure;
3442 #ifdef CONFIG_IP_VS_IPV6
3443         if (c->mcast_af == AF_INET6) {
3444                 if (nla_put_in6_addr(skb, IPVS_DAEMON_ATTR_MCAST_GROUP6,
3445                                      &c->mcast_group.in6))
3446                         goto nla_put_failure;
3447         } else
3448 #endif
3449                 if (c->mcast_af == AF_INET &&
3450                     nla_put_in_addr(skb, IPVS_DAEMON_ATTR_MCAST_GROUP,
3451                                     c->mcast_group.ip))
3452                         goto nla_put_failure;
3453         nla_nest_end(skb, nl_daemon);
3454 
3455         return 0;
3456 
3457 nla_put_failure:
3458         nla_nest_cancel(skb, nl_daemon);
3459         return -EMSGSIZE;
3460 }
3461 
3462 static int ip_vs_genl_dump_daemon(struct sk_buff *skb, __u32 state,
3463                                   struct ipvs_sync_daemon_cfg *c,
3464                                   struct netlink_callback *cb)
3465 {
3466         void *hdr;
3467         hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
3468                           &ip_vs_genl_family, NLM_F_MULTI,
3469                           IPVS_CMD_NEW_DAEMON);
3470         if (!hdr)
3471                 return -EMSGSIZE;
3472 
3473         if (ip_vs_genl_fill_daemon(skb, state, c))
3474                 goto nla_put_failure;
3475 
3476         genlmsg_end(skb, hdr);
3477         return 0;
3478 
3479 nla_put_failure:
3480         genlmsg_cancel(skb, hdr);
3481         return -EMSGSIZE;
3482 }
3483 
3484 static int ip_vs_genl_dump_daemons(struct sk_buff *skb,
3485                                    struct netlink_callback *cb)
3486 {
3487         struct net *net = sock_net(skb->sk);
3488         struct netns_ipvs *ipvs = net_ipvs(net);
3489 
3490         mutex_lock(&ipvs->sync_mutex);
3491         if ((ipvs->sync_state & IP_VS_STATE_MASTER) && !cb->args[0]) {
3492                 if (ip_vs_genl_dump_daemon(skb, IP_VS_STATE_MASTER,
3493                                            &ipvs->mcfg, cb) < 0)
3494                         goto nla_put_failure;
3495 
3496                 cb->args[0] = 1;
3497         }
3498 
3499         if ((ipvs->sync_state & IP_VS_STATE_BACKUP) && !cb->args[1]) {
3500                 if (ip_vs_genl_dump_daemon(skb, IP_VS_STATE_BACKUP,
3501                                            &ipvs->bcfg, cb) < 0)
3502                         goto nla_put_failure;
3503 
3504                 cb->args[1] = 1;
3505         }
3506 
3507 nla_put_failure:
3508         mutex_unlock(&ipvs->sync_mutex);
3509 
3510         return skb->len;
3511 }
3512 
3513 static int ip_vs_genl_new_daemon(struct netns_ipvs *ipvs, struct nlattr **attrs)
3514 {
3515         struct ipvs_sync_daemon_cfg c;
3516         struct nlattr *a;
3517         int ret;
3518 
3519         memset(&c, 0, sizeof(c));
3520         if (!(attrs[IPVS_DAEMON_ATTR_STATE] &&
3521               attrs[IPVS_DAEMON_ATTR_MCAST_IFN] &&
3522               attrs[IPVS_DAEMON_ATTR_SYNC_ID]))
3523                 return -EINVAL;
3524         strlcpy(c.mcast_ifn, nla_data(attrs[IPVS_DAEMON_ATTR_MCAST_IFN]),
3525                 sizeof(c.mcast_ifn));
3526         c.syncid = nla_get_u32(attrs[IPVS_DAEMON_ATTR_SYNC_ID]);
3527 
3528         a = attrs[IPVS_DAEMON_ATTR_SYNC_MAXLEN];
3529         if (a)
3530                 c.sync_maxlen = nla_get_u16(a);
3531 
3532         a = attrs[IPVS_DAEMON_ATTR_MCAST_GROUP];
3533         if (a) {
3534                 c.mcast_af = AF_INET;
3535                 c.mcast_group.ip = nla_get_in_addr(a);
3536                 if (!ipv4_is_multicast(c.mcast_group.ip))
3537                         return -EINVAL;
3538         } else {
3539                 a = attrs[IPVS_DAEMON_ATTR_MCAST_GROUP6];
3540                 if (a) {
3541 #ifdef CONFIG_IP_VS_IPV6
3542                         int addr_type;
3543 
3544                         c.mcast_af = AF_INET6;
3545                         c.mcast_group.in6 = nla_get_in6_addr(a);
3546                         addr_type = ipv6_addr_type(&c.mcast_group.in6);
3547                         if (!(addr_type & IPV6_ADDR_MULTICAST))
3548                                 return -EINVAL;
3549 #else
3550                         return -EAFNOSUPPORT;
3551 #endif
3552                 }
3553         }
3554 
3555         a = attrs[IPVS_DAEMON_ATTR_MCAST_PORT];
3556         if (a)
3557                 c.mcast_port = nla_get_u16(a);
3558 
3559         a = attrs[IPVS_DAEMON_ATTR_MCAST_TTL];
3560         if (a)
3561                 c.mcast_ttl = nla_get_u8(a);
3562 
3563         /* The synchronization protocol is incompatible with mixed family
3564          * services
3565          */
3566         if (ipvs->mixed_address_family_dests > 0)
3567                 return -EINVAL;
3568 
3569         ret = start_sync_thread(ipvs, &c,
3570                                 nla_get_u32(attrs[IPVS_DAEMON_ATTR_STATE]));
3571         return ret;
3572 }
3573 
3574 static int ip_vs_genl_del_daemon(struct netns_ipvs *ipvs, struct nlattr **attrs)
3575 {
3576         int ret;
3577 
3578         if (!attrs[IPVS_DAEMON_ATTR_STATE])
3579                 return -EINVAL;
3580 
3581         ret = stop_sync_thread(ipvs,
3582                                nla_get_u32(attrs[IPVS_DAEMON_ATTR_STATE]));
3583         return ret;
3584 }
3585 
3586 static int ip_vs_genl_set_config(struct netns_ipvs *ipvs, struct nlattr **attrs)
3587 {
3588         struct ip_vs_timeout_user t;
3589 
3590         __ip_vs_get_timeouts(ipvs, &t);
3591 
3592         if (attrs[IPVS_CMD_ATTR_TIMEOUT_TCP])
3593                 t.tcp_timeout = nla_get_u32(attrs[IPVS_CMD_ATTR_TIMEOUT_TCP]);
3594 
3595         if (attrs[IPVS_CMD_ATTR_TIMEOUT_TCP_FIN])
3596                 t.tcp_fin_timeout =
3597                         nla_get_u32(attrs[IPVS_CMD_ATTR_TIMEOUT_TCP_FIN]);
3598 
3599         if (attrs[IPVS_CMD_ATTR_TIMEOUT_UDP])
3600                 t.udp_timeout = nla_get_u32(attrs[IPVS_CMD_ATTR_TIMEOUT_UDP]);
3601 
3602         return ip_vs_set_timeout(ipvs, &t);
3603 }
3604 
3605 static int ip_vs_genl_set_daemon(struct sk_buff *skb, struct genl_info *info)
3606 {
3607         int ret = -EINVAL, cmd;
3608         struct net *net = sock_net(skb->sk);
3609         struct netns_ipvs *ipvs = net_ipvs(net);
3610 
3611         cmd = info->genlhdr->cmd;
3612 
3613         if (cmd == IPVS_CMD_NEW_DAEMON || cmd == IPVS_CMD_DEL_DAEMON) {
3614                 struct nlattr *daemon_attrs[IPVS_DAEMON_ATTR_MAX + 1];
3615 
3616                 if (!info->attrs[IPVS_CMD_ATTR_DAEMON] ||
3617                     nla_parse_nested_deprecated(daemon_attrs, IPVS_DAEMON_ATTR_MAX, info->attrs[IPVS_CMD_ATTR_DAEMON], ip_vs_daemon_policy, info->extack))
3618                         goto out;
3619 
3620                 if (cmd == IPVS_CMD_NEW_DAEMON)
3621                         ret = ip_vs_genl_new_daemon(ipvs, daemon_attrs);
3622                 else
3623                         ret = ip_vs_genl_del_daemon(ipvs, daemon_attrs);
3624         }
3625 
3626 out:
3627         return ret;
3628 }
3629 
3630 static int ip_vs_genl_set_cmd(struct sk_buff *skb, struct genl_info *info)
3631 {
3632         bool need_full_svc = false, need_full_dest = false;
3633         struct ip_vs_service *svc = NULL;
3634         struct ip_vs_service_user_kern usvc;
3635         struct ip_vs_dest_user_kern udest;
3636         int ret = 0, cmd;
3637         struct net *net = sock_net(skb->sk);
3638         struct netns_ipvs *ipvs = net_ipvs(net);
3639 
3640         cmd = info->genlhdr->cmd;
3641 
3642         mutex_lock(&__ip_vs_mutex);
3643 
3644         if (cmd == IPVS_CMD_FLUSH) {
3645                 ret = ip_vs_flush(ipvs, false);
3646                 goto out;
3647         } else if (cmd == IPVS_CMD_SET_CONFIG) {
3648                 ret = ip_vs_genl_set_config(ipvs, info->attrs);
3649                 goto out;
3650         } else if (cmd == IPVS_CMD_ZERO &&
3651                    !info->attrs[IPVS_CMD_ATTR_SERVICE]) {
3652                 ret = ip_vs_zero_all(ipvs);
3653                 goto out;
3654         }
3655 
3656         /* All following commands require a service argument, so check if we
3657          * received a valid one. We need a full service specification when
3658          * adding / editing a service. Only identifying members otherwise. */
3659         if (cmd == IPVS_CMD_NEW_SERVICE || cmd == IPVS_CMD_SET_SERVICE)
3660                 need_full_svc = true;
3661 
3662         ret = ip_vs_genl_parse_service(ipvs, &usvc,
3663                                        info->attrs[IPVS_CMD_ATTR_SERVICE],
3664                                        need_full_svc, &svc);
3665         if (ret)
3666                 goto out;
3667 
3668         /* Unless we're adding a new service, the service must already exist */
3669         if ((cmd != IPVS_CMD_NEW_SERVICE) && (svc == NULL)) {
3670                 ret = -ESRCH;
3671                 goto out;
3672         }
3673 
3674         /* Destination commands require a valid destination argument. For
3675          * adding / editing a destination, we need a full destination
3676          * specification. */
3677         if (cmd == IPVS_CMD_NEW_DEST || cmd == IPVS_CMD_SET_DEST ||
3678             cmd == IPVS_CMD_DEL_DEST) {
3679                 if (cmd != IPVS_CMD_DEL_DEST)
3680                         need_full_dest = true;
3681 
3682                 ret = ip_vs_genl_parse_dest(&udest,
3683                                             info->attrs[IPVS_CMD_ATTR_DEST],
3684                                             need_full_dest);
3685                 if (ret)
3686                         goto out;
3687 
3688                 /* Old protocols did not allow the user to specify address
3689                  * family, so we set it to zero instead.  We also didn't
3690                  * allow heterogeneous pools in the old code, so it's safe
3691                  * to assume that this will have the same address family as
3692                  * the service.
3693                  */
3694                 if (udest.af == 0)
3695                         udest.af = svc->af;
3696 
3697                 if (!ip_vs_is_af_valid(udest.af)) {
3698                         ret = -EAFNOSUPPORT;
3699                         goto out;
3700                 }
3701 
3702                 if (udest.af != svc->af && cmd != IPVS_CMD_DEL_DEST) {
3703                         /* The synchronization protocol is incompatible
3704                          * with mixed family services
3705                          */
3706                         if (ipvs->sync_state) {
3707                                 ret = -EINVAL;
3708                                 goto out;
3709                         }
3710 
3711                         /* Which connection types do we support? */
3712                         switch (udest.conn_flags) {
3713                         case IP_VS_CONN_F_TUNNEL:
3714                                 /* We are able to forward this */
3715                                 break;
3716                         default:
3717                                 ret = -EINVAL;
3718                                 goto out;
3719                         }
3720                 }
3721         }
3722 
3723         switch (cmd) {
3724         case IPVS_CMD_NEW_SERVICE:
3725                 if (svc == NULL)
3726                         ret = ip_vs_add_service(ipvs, &usvc, &svc);
3727                 else
3728                         ret = -EEXIST;
3729                 break;
3730         case IPVS_CMD_SET_SERVICE:
3731                 ret = ip_vs_edit_service(svc, &usvc);
3732                 break;
3733         case IPVS_CMD_DEL_SERVICE:
3734                 ret = ip_vs_del_service(svc);
3735                 /* do not use svc, it can be freed */
3736                 break;
3737         case IPVS_CMD_NEW_DEST:
3738                 ret = ip_vs_add_dest(svc, &udest);
3739                 break;
3740         case IPVS_CMD_SET_DEST:
3741                 ret = ip_vs_edit_dest(svc, &udest);
3742                 break;
3743         case IPVS_CMD_DEL_DEST:
3744                 ret = ip_vs_del_dest(svc, &udest);
3745                 break;
3746         case IPVS_CMD_ZERO:
3747                 ret = ip_vs_zero_service(svc);
3748                 break;
3749         default:
3750                 ret = -EINVAL;
3751         }
3752 
3753 out:
3754         mutex_unlock(&__ip_vs_mutex);
3755 
3756         return ret;
3757 }
3758 
3759 static int ip_vs_genl_get_cmd(struct sk_buff *skb, struct genl_info *info)
3760 {
3761         struct sk_buff *msg;
3762         void *reply;
3763         int ret, cmd, reply_cmd;
3764         struct net *net = sock_net(skb->sk);
3765         struct netns_ipvs *ipvs = net_ipvs(net);
3766 
3767         cmd = info->genlhdr->cmd;
3768 
3769         if (cmd == IPVS_CMD_GET_SERVICE)
3770                 reply_cmd = IPVS_CMD_NEW_SERVICE;
3771         else if (cmd == IPVS_CMD_GET_INFO)
3772                 reply_cmd = IPVS_CMD_SET_INFO;
3773         else if (cmd == IPVS_CMD_GET_CONFIG)
3774                 reply_cmd = IPVS_CMD_SET_CONFIG;
3775         else {
3776                 pr_err("unknown Generic Netlink command\n");
3777                 return -EINVAL;
3778         }
3779 
3780         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
3781         if (!msg)
3782                 return -ENOMEM;
3783 
3784         mutex_lock(&__ip_vs_mutex);
3785 
3786         reply = genlmsg_put_reply(msg, info, &ip_vs_genl_family, 0, reply_cmd);
3787         if (reply == NULL)
3788                 goto nla_put_failure;
3789 
3790         switch (cmd) {
3791         case IPVS_CMD_GET_SERVICE:
3792         {
3793                 struct ip_vs_service *svc;
3794 
3795                 svc = ip_vs_genl_find_service(ipvs,
3796                                               info->attrs[IPVS_CMD_ATTR_SERVICE]);
3797                 if (IS_ERR(svc)) {
3798                         ret = PTR_ERR(svc);
3799                         goto out_err;
3800                 } else if (svc) {
3801                         ret = ip_vs_genl_fill_service(msg, svc);
3802                         if (ret)
3803                                 goto nla_put_failure;
3804                 } else {
3805                         ret = -ESRCH;
3806                         goto out_err;
3807                 }
3808 
3809                 break;
3810         }
3811 
3812         case IPVS_CMD_GET_CONFIG:
3813         {
3814                 struct ip_vs_timeout_user t;
3815 
3816                 __ip_vs_get_timeouts(ipvs, &t);
3817 #ifdef CONFIG_IP_VS_PROTO_TCP
3818                 if (nla_put_u32(msg, IPVS_CMD_ATTR_TIMEOUT_TCP,
3819                                 t.tcp_timeout) ||
3820                     nla_put_u32(msg, IPVS_CMD_ATTR_TIMEOUT_TCP_FIN,
3821                                 t.tcp_fin_timeout))
3822                         goto nla_put_failure;
3823 #endif
3824 #ifdef CONFIG_IP_VS_PROTO_UDP
3825                 if (nla_put_u32(msg, IPVS_CMD_ATTR_TIMEOUT_UDP, t.udp_timeout))
3826                         goto nla_put_failure;
3827 #endif
3828 
3829                 break;
3830         }
3831 
3832         case IPVS_CMD_GET_INFO:
3833                 if (nla_put_u32(msg, IPVS_INFO_ATTR_VERSION,
3834                                 IP_VS_VERSION_CODE) ||
3835                     nla_put_u32(msg, IPVS_INFO_ATTR_CONN_TAB_SIZE,
3836                                 ip_vs_conn_tab_size))
3837                         goto nla_put_failure;
3838                 break;
3839         }
3840 
3841         genlmsg_end(msg, reply);
3842         ret = genlmsg_reply(msg, info);
3843         goto out;
3844 
3845 nla_put_failure:
3846         pr_err("not enough space in Netlink message\n");
3847         ret = -EMSGSIZE;
3848 
3849 out_err:
3850         nlmsg_free(msg);
3851 out:
3852         mutex_unlock(&__ip_vs_mutex);
3853 
3854         return ret;
3855 }
3856 
3857 
3858 static const struct genl_ops ip_vs_genl_ops[] = {
3859         {
3860                 .cmd    = IPVS_CMD_NEW_SERVICE,
3861                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3862                 .flags  = GENL_ADMIN_PERM,
3863                 .doit   = ip_vs_genl_set_cmd,
3864         },
3865         {
3866                 .cmd    = IPVS_CMD_SET_SERVICE,
3867                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3868                 .flags  = GENL_ADMIN_PERM,
3869                 .doit   = ip_vs_genl_set_cmd,
3870         },
3871         {
3872                 .cmd    = IPVS_CMD_DEL_SERVICE,
3873                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3874                 .flags  = GENL_ADMIN_PERM,
3875                 .doit   = ip_vs_genl_set_cmd,
3876         },
3877         {
3878                 .cmd    = IPVS_CMD_GET_SERVICE,
3879                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3880                 .flags  = GENL_ADMIN_PERM,
3881                 .doit   = ip_vs_genl_get_cmd,
3882                 .dumpit = ip_vs_genl_dump_services,
3883         },
3884         {
3885                 .cmd    = IPVS_CMD_NEW_DEST,
3886                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3887                 .flags  = GENL_ADMIN_PERM,
3888                 .doit   = ip_vs_genl_set_cmd,
3889         },
3890         {
3891                 .cmd    = IPVS_CMD_SET_DEST,
3892                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3893                 .flags  = GENL_ADMIN_PERM,
3894                 .doit   = ip_vs_genl_set_cmd,
3895         },
3896         {
3897                 .cmd    = IPVS_CMD_DEL_DEST,
3898                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3899                 .flags  = GENL_ADMIN_PERM,
3900                 .doit   = ip_vs_genl_set_cmd,
3901         },
3902         {
3903                 .cmd    = IPVS_CMD_GET_DEST,
3904                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3905                 .flags  = GENL_ADMIN_PERM,
3906                 .dumpit = ip_vs_genl_dump_dests,
3907         },
3908         {
3909                 .cmd    = IPVS_CMD_NEW_DAEMON,
3910                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3911                 .flags  = GENL_ADMIN_PERM,
3912                 .doit   = ip_vs_genl_set_daemon,
3913         },
3914         {
3915                 .cmd    = IPVS_CMD_DEL_DAEMON,
3916                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3917                 .flags  = GENL_ADMIN_PERM,
3918                 .doit   = ip_vs_genl_set_daemon,
3919         },
3920         {
3921                 .cmd    = IPVS_CMD_GET_DAEMON,
3922                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3923                 .flags  = GENL_ADMIN_PERM,
3924                 .dumpit = ip_vs_genl_dump_daemons,
3925         },
3926         {
3927                 .cmd    = IPVS_CMD_SET_CONFIG,
3928                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3929                 .flags  = GENL_ADMIN_PERM,
3930                 .doit   = ip_vs_genl_set_cmd,
3931         },
3932         {
3933                 .cmd    = IPVS_CMD_GET_CONFIG,
3934                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3935                 .flags  = GENL_ADMIN_PERM,
3936                 .doit   = ip_vs_genl_get_cmd,
3937         },
3938         {
3939                 .cmd    = IPVS_CMD_GET_INFO,
3940                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3941                 .flags  = GENL_ADMIN_PERM,
3942                 .doit   = ip_vs_genl_get_cmd,
3943         },
3944         {
3945                 .cmd    = IPVS_CMD_ZERO,
3946                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3947                 .flags  = GENL_ADMIN_PERM,
3948                 .doit   = ip_vs_genl_set_cmd,
3949         },
3950         {
3951                 .cmd    = IPVS_CMD_FLUSH,
3952                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3953                 .flags  = GENL_ADMIN_PERM,
3954                 .doit   = ip_vs_genl_set_cmd,
3955         },
3956 };
3957 
3958 static struct genl_family ip_vs_genl_family __ro_after_init = {
3959         .hdrsize        = 0,
3960         .name           = IPVS_GENL_NAME,
3961         .version        = IPVS_GENL_VERSION,
3962         .maxattr        = IPVS_CMD_ATTR_MAX,
3963         .policy = ip_vs_cmd_policy,
3964         .netnsok        = true,         /* Make ipvsadm to work on netns */
3965         .module         = THIS_MODULE,
3966         .ops            = ip_vs_genl_ops,
3967         .n_ops          = ARRAY_SIZE(ip_vs_genl_ops),
3968 };
3969 
3970 static int __init ip_vs_genl_register(void)
3971 {
3972         return genl_register_family(&ip_vs_genl_family);
3973 }
3974 
3975 static void ip_vs_genl_unregister(void)
3976 {
3977         genl_unregister_family(&ip_vs_genl_family);
3978 }
3979 
3980 /* End of Generic Netlink interface definitions */
3981 
3982 /*
3983  * per netns intit/exit func.
3984  */
3985 #ifdef CONFIG_SYSCTL
3986 static int __net_init ip_vs_control_net_init_sysctl(struct netns_ipvs *ipvs)
3987 {
3988         struct net *net = ipvs->net;
3989         int idx;
3990         struct ctl_table *tbl;
3991 
3992         atomic_set(&ipvs->dropentry, 0);
3993         spin_lock_init(&ipvs->dropentry_lock);
3994         spin_lock_init(&ipvs->droppacket_lock);
3995         spin_lock_init(&ipvs->securetcp_lock);
3996 
3997         if (!net_eq(net, &init_net)) {
3998                 tbl = kmemdup(vs_vars, sizeof(vs_vars), GFP_KERNEL);
3999                 if (tbl == NULL)
4000                         return -ENOMEM;
4001 
4002                 /* Don't export sysctls to unprivileged users */
4003                 if (net->user_ns != &init_user_ns)
4004                         tbl[0].procname = NULL;
4005         } else
4006                 tbl = vs_vars;
4007         /* Initialize sysctl defaults */
4008         for (idx = 0; idx < ARRAY_SIZE(vs_vars); idx++) {
4009                 if (tbl[idx].proc_handler == proc_do_defense_mode)
4010                         tbl[idx].extra2 = ipvs;
4011         }
4012         idx = 0;
4013         ipvs->sysctl_amemthresh = 1024;
4014         tbl[idx++].data = &ipvs->sysctl_amemthresh;
4015         ipvs->sysctl_am_droprate = 10;
4016         tbl[idx++].data = &ipvs->sysctl_am_droprate;
4017         tbl[idx++].data = &ipvs->sysctl_drop_entry;
4018         tbl[idx++].data = &ipvs->sysctl_drop_packet;
4019 #ifdef CONFIG_IP_VS_NFCT
4020         tbl[idx++].data = &ipvs->sysctl_conntrack;
4021 #endif
4022         tbl[idx++].data = &ipvs->sysctl_secure_tcp;
4023         ipvs->sysctl_snat_reroute = 1;
4024         tbl[idx++].data = &ipvs->sysctl_snat_reroute;
4025         ipvs->sysctl_sync_ver = 1;
4026         tbl[idx++].data = &ipvs->sysctl_sync_ver;
4027         ipvs->sysctl_sync_ports = 1;
4028         tbl[idx++].data = &ipvs->sysctl_sync_ports;
4029         tbl[idx++].data = &ipvs->sysctl_sync_persist_mode;
4030         ipvs->sysctl_sync_qlen_max = nr_free_buffer_pages() / 32;
4031         tbl[idx++].data = &ipvs->sysctl_sync_qlen_max;
4032         ipvs->sysctl_sync_sock_size = 0;
4033         tbl[idx++].data = &ipvs->sysctl_sync_sock_size;
4034         tbl[idx++].data = &ipvs->sysctl_cache_bypass;
4035         tbl[idx++].data = &ipvs->sysctl_expire_nodest_conn;
4036         tbl[idx++].data = &ipvs->sysctl_sloppy_tcp;
4037         tbl[idx++].data = &ipvs->sysctl_sloppy_sctp;
4038         tbl[idx++].data = &ipvs->sysctl_expire_quiescent_template;
4039         ipvs->sysctl_sync_threshold[0] = DEFAULT_SYNC_THRESHOLD;
4040         ipvs->sysctl_sync_threshold[1] = DEFAULT_SYNC_PERIOD;
4041         tbl[idx].data = &ipvs->sysctl_sync_threshold;
4042         tbl[idx++].maxlen = sizeof(ipvs->sysctl_sync_threshold);
4043         ipvs->sysctl_sync_refresh_period = DEFAULT_SYNC_REFRESH_PERIOD;
4044         tbl[idx++].data = &ipvs->sysctl_sync_refresh_period;
4045         ipvs->sysctl_sync_retries = clamp_t(int, DEFAULT_SYNC_RETRIES, 0, 3);
4046         tbl[idx++].data = &ipvs->sysctl_sync_retries;
4047         tbl[idx++].data = &ipvs->sysctl_nat_icmp_send;
4048         ipvs->sysctl_pmtu_disc = 1;
4049         tbl[idx++].data = &ipvs->sysctl_pmtu_disc;
4050         tbl[idx++].data = &ipvs->sysctl_backup_only;
4051         ipvs->sysctl_conn_reuse_mode = 1;
4052         tbl[idx++].data = &ipvs->sysctl_conn_reuse_mode;
4053         tbl[idx++].data = &ipvs->sysctl_schedule_icmp;
4054         tbl[idx++].data = &ipvs->sysctl_ignore_tunneled;
4055 
4056         ipvs->sysctl_hdr = register_net_sysctl(net, "net/ipv4/vs", tbl);
4057         if (ipvs->sysctl_hdr == NULL) {
4058                 if (!net_eq(net, &init_net))
4059                         kfree(tbl);
4060                 return -ENOMEM;
4061         }
4062         ip_vs_start_estimator(ipvs, &ipvs->tot_stats);
4063         ipvs->sysctl_tbl = tbl;
4064         /* Schedule defense work */
4065         INIT_DELAYED_WORK(&ipvs->defense_work, defense_work_handler);
4066         schedule_delayed_work(&ipvs->defense_work, DEFENSE_TIMER_PERIOD);
4067 
4068         return 0;
4069 }
4070 
4071 static void __net_exit ip_vs_control_net_cleanup_sysctl(struct netns_ipvs *ipvs)
4072 {
4073         struct net *net = ipvs->net;
4074 
4075         cancel_delayed_work_sync(&ipvs->defense_work);
4076         cancel_work_sync(&ipvs->defense_work.work);
4077         unregister_net_sysctl_table(ipvs->sysctl_hdr);
4078         ip_vs_stop_estimator(ipvs, &ipvs->tot_stats);
4079 
4080         if (!net_eq(net, &init_net))
4081                 kfree(ipvs->sysctl_tbl);
4082 }
4083 
4084 #else
4085 
4086 static int __net_init ip_vs_control_net_init_sysctl(struct netns_ipvs *ipvs) { return 0; }
4087 static void __net_exit ip_vs_control_net_cleanup_sysctl(struct netns_ipvs *ipvs) { }
4088 
4089 #endif
4090 
4091 static struct notifier_block ip_vs_dst_notifier = {
4092         .notifier_call = ip_vs_dst_event,
4093 #ifdef CONFIG_IP_VS_IPV6
4094         .priority = ADDRCONF_NOTIFY_PRIORITY + 5,
4095 #endif
4096 };
4097 
4098 int __net_init ip_vs_control_net_init(struct netns_ipvs *ipvs)
4099 {
4100         int i, idx;
4101 
4102         /* Initialize rs_table */
4103         for (idx = 0; idx < IP_VS_RTAB_SIZE; idx++)
4104                 INIT_HLIST_HEAD(&ipvs->rs_table[idx]);
4105 
4106         INIT_LIST_HEAD(&ipvs->dest_trash);
4107         spin_lock_init(&ipvs->dest_trash_lock);
4108         timer_setup(&ipvs->dest_trash_timer, ip_vs_dest_trash_expire, 0);
4109         atomic_set(&ipvs->ftpsvc_counter, 0);
4110         atomic_set(&ipvs->nullsvc_counter, 0);
4111         atomic_set(&ipvs->conn_out_counter, 0);
4112 
4113         /* procfs stats */
4114         ipvs->tot_stats.cpustats = alloc_percpu(struct ip_vs_cpu_stats);
4115         if (!ipvs->tot_stats.cpustats)
4116                 return -ENOMEM;
4117 
4118         for_each_possible_cpu(i) {
4119                 struct ip_vs_cpu_stats *ipvs_tot_stats;
4120                 ipvs_tot_stats = per_cpu_ptr(ipvs->tot_stats.cpustats, i);
4121                 u64_stats_init(&ipvs_tot_stats->syncp);
4122         }
4123 
4124         spin_lock_init(&ipvs->tot_stats.lock);
4125 
4126         proc_create_net("ip_vs", 0, ipvs->net->proc_net, &ip_vs_info_seq_ops,
4127                         sizeof(struct ip_vs_iter));
4128         proc_create_net_single("ip_vs_stats", 0, ipvs->net->proc_net,
4129                         ip_vs_stats_show, NULL);
4130         proc_create_net_single("ip_vs_stats_percpu", 0, ipvs->net->proc_net,
4131                         ip_vs_stats_percpu_show, NULL);
4132 
4133         if (ip_vs_control_net_init_sysctl(ipvs))
4134                 goto err;
4135 
4136         return 0;
4137 
4138 err:
4139         free_percpu(ipvs->tot_stats.cpustats);
4140         return -ENOMEM;
4141 }
4142 
4143 void __net_exit ip_vs_control_net_cleanup(struct netns_ipvs *ipvs)
4144 {
4145         ip_vs_trash_cleanup(ipvs);
4146         ip_vs_control_net_cleanup_sysctl(ipvs);
4147         remove_proc_entry("ip_vs_stats_percpu", ipvs->net->proc_net);
4148         remove_proc_entry("ip_vs_stats", ipvs->net->proc_net);
4149         remove_proc_entry("ip_vs", ipvs->net->proc_net);
4150         free_percpu(ipvs->tot_stats.cpustats);
4151 }
4152 
4153 int __init ip_vs_register_nl_ioctl(void)
4154 {
4155         int ret;
4156 
4157         ret = nf_register_sockopt(&ip_vs_sockopts);
4158         if (ret) {
4159                 pr_err("cannot register sockopt.\n");
4160                 goto err_sock;
4161         }
4162 
4163         ret = ip_vs_genl_register();
4164         if (ret) {
4165                 pr_err("cannot register Generic Netlink interface.\n");
4166                 goto err_genl;
4167         }
4168         return 0;
4169 
4170 err_genl:
4171         nf_unregister_sockopt(&ip_vs_sockopts);
4172 err_sock:
4173         return ret;
4174 }
4175 
4176 void ip_vs_unregister_nl_ioctl(void)
4177 {
4178         ip_vs_genl_unregister();
4179         nf_unregister_sockopt(&ip_vs_sockopts);
4180 }
4181 
4182 int __init ip_vs_control_init(void)
4183 {
4184         int idx;
4185         int ret;
4186 
4187         EnterFunction(2);
4188 
4189         /* Initialize svc_table, ip_vs_svc_fwm_table */
4190         for (idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
4191                 INIT_HLIST_HEAD(&ip_vs_svc_table[idx]);
4192                 INIT_HLIST_HEAD(&ip_vs_svc_fwm_table[idx]);
4193         }
4194 
4195         smp_wmb();      /* Do we really need it now ? */
4196 
4197         ret = register_netdevice_notifier(&ip_vs_dst_notifier);
4198         if (ret < 0)
4199                 return ret;
4200 
4201         LeaveFunction(2);
4202         return 0;
4203 }
4204 
4205 
4206 void ip_vs_control_cleanup(void)
4207 {
4208         EnterFunction(2);
4209         unregister_netdevice_notifier(&ip_vs_dst_notifier);
4210         LeaveFunction(2);
4211 }
4212 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp