net/netfilter/ipvs/ip_vs_ctl.c

   1 /*
   2  * IPVS         An implementation of the IP virtual server support for the
   3  *              LINUX operating system.  IPVS is now implemented as a module
   4  *              over the NetFilter framework. IPVS can be used to build a
   5  *              high-performance and highly available server based on a
   6  *              cluster of servers.
   7  *
   8  * Authors:     Wensong Zhang <wensong@linuxvirtualserver.org>
   9  *              Peter Kese <peter.kese@ijs.si>
  10  *              Julian Anastasov <ja@ssi.bg>
  11  *
  12  *              This program is free software; you can redistribute it and/or
  13  *              modify it under the terms of the GNU General Public License
  14  *              as published by the Free Software Foundation; either version
  15  *              2 of the License, or (at your option) any later version.
  16  *
  17  * Changes:
  18  *
  19  */
  20
  21 #define KMSG_COMPONENT "IPVS"
  22 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  23
  24 #include <linux/module.h>
  25 #include <linux/init.h>
  26 #include <linux/types.h>
  27 #include <linux/capability.h>
  28 #include <linux/fs.h>
  29 #include <linux/sysctl.h>
  30 #include <linux/proc_fs.h>
  31 #include <linux/workqueue.h>
  32 #include <linux/swap.h>
  33 #include <linux/seq_file.h>
  34 #include <linux/slab.h>
  35
  36 #include <linux/netfilter.h>
  37 #include <linux/netfilter_ipv4.h>
  38 #include <linux/mutex.h>
  39
  40 #include <net/net_namespace.h>
  41 #include <linux/nsproxy.h>
  42 #include <net/ip.h>
  43 #ifdef CONFIG_IP_VS_IPV6
  44 #include <net/ipv6.h>
  45 #include <net/ip6_route.h>
  46 #endif
  47 #include <net/route.h>
  48 #include <net/sock.h>
  49 #include <net/genetlink.h>
  50
  51 #include <asm/uaccess.h>
  52
  53 #include <net/ip_vs.h>
  54
  55 /* semaphore for IPVS sockopts. And, [gs]etsockopt may sleep. */
  56 static DEFINE_MUTEX(__ip_vs_mutex);
  57
  58 /* sysctl variables */
  59
  60 #ifdef CONFIG_IP_VS_DEBUG
  61 static int sysctl_ip_vs_debug_level = 0;
  62
  63 int ip_vs_get_debug_level(void)
  64 {
  65         return sysctl_ip_vs_debug_level;
  66 }
  67 #endif
  68
  69
  70 /*  Protos */
  71 static void __ip_vs_del_service(struct ip_vs_service *svc, bool cleanup);
  72
  73
  74 #ifdef CONFIG_IP_VS_IPV6
  75 /* Taken from rt6_fill_node() in net/ipv6/route.c, is there a better way? */
  76 static bool __ip_vs_addr_is_local_v6(struct net *net,
  77                                      const struct in6_addr *addr)
  78 {
  79         struct flowi6 fl6 = {
  80                 .daddr = *addr,
  81         };
  82         struct dst_entry *dst = ip6_route_output(net, NULL, &fl6);
  83         bool is_local;
  84
  85         is_local = !dst->error && dst->dev && (dst->dev->flags & IFF_LOOPBACK);
  86
  87         dst_release(dst);
  88         return is_local;
  89 }
  90 #endif
  91
  92 #ifdef CONFIG_SYSCTL
  93 /*
  94  *      update_defense_level is called from keventd and from sysctl,
  95  *      so it needs to protect itself from softirqs
  96  */
  97 static void update_defense_level(struct netns_ipvs *ipvs)
  98 {
  99         struct sysinfo i;
 100         int availmem;
 101         int nomem;
 102         int to_change = -1;
 103
 104         /* we only count free and buffered memory (in pages) */
 105         si_meminfo(&i);
 106         availmem = i.freeram + i.bufferram;
 107         /* however in linux 2.5 the i.bufferram is total page cache size,
 108            we need adjust it */
 109         /* si_swapinfo(&i); */
 110         /* availmem = availmem - (i.totalswap - i.freeswap); */
 111
 112         nomem = (availmem < ipvs->sysctl_amemthresh);
 113
 114         local_bh_disable();
 115
 116         /* drop_entry */
 117         spin_lock(&ipvs->dropentry_lock);
 118         switch (ipvs->sysctl_drop_entry) {
 119         case 0:
 120                 atomic_set(&ipvs->dropentry, 0);
 121                 break;
 122         case 1:
 123                 if (nomem) {
 124                         atomic_set(&ipvs->dropentry, 1);
 125                         ipvs->sysctl_drop_entry = 2;
 126                 } else {
 127                         atomic_set(&ipvs->dropentry, 0);
 128                 }
 129                 break;
 130         case 2:
 131                 if (nomem) {
 132                         atomic_set(&ipvs->dropentry, 1);
 133                 } else {
 134                         atomic_set(&ipvs->dropentry, 0);
 135                         ipvs->sysctl_drop_entry = 1;
 136                 };
 137                 break;
 138         case 3:
 139                 atomic_set(&ipvs->dropentry, 1);
 140                 break;
 141         }
 142         spin_unlock(&ipvs->dropentry_lock);
 143
 144         /* drop_packet */
 145         spin_lock(&ipvs->droppacket_lock);
 146         switch (ipvs->sysctl_drop_packet) {
 147         case 0:
 148                 ipvs->drop_rate = 0;
 149                 break;
 150         case 1:
 151                 if (nomem) {
 152                         ipvs->drop_rate = ipvs->drop_counter
 153                                 = ipvs->sysctl_amemthresh /
 154                                 (ipvs->sysctl_amemthresh-availmem);
 155                         ipvs->sysctl_drop_packet = 2;
 156                 } else {
 157                         ipvs->drop_rate = 0;
 158                 }
 159                 break;
 160         case 2:
 161                 if (nomem) {
 162                         ipvs->drop_rate = ipvs->drop_counter
 163                                 = ipvs->sysctl_amemthresh /
 164                                 (ipvs->sysctl_amemthresh-availmem);
 165                 } else {
 166                         ipvs->drop_rate = 0;
 167                         ipvs->sysctl_drop_packet = 1;
 168                 }
 169                 break;
 170         case 3:
 171                 ipvs->drop_rate = ipvs->sysctl_am_droprate;
 172                 break;
 173         }
 174         spin_unlock(&ipvs->droppacket_lock);
 175
 176         /* secure_tcp */
 177         spin_lock(&ipvs->securetcp_lock);
 178         switch (ipvs->sysctl_secure_tcp) {
 179         case 0:
 180                 if (ipvs->old_secure_tcp >= 2)
 181                         to_change = 0;
 182                 break;
 183         case 1:
 184                 if (nomem) {
 185                         if (ipvs->old_secure_tcp < 2)
 186                                 to_change = 1;
 187                         ipvs->sysctl_secure_tcp = 2;
 188                 } else {
 189                         if (ipvs->old_secure_tcp >= 2)
 190                                 to_change = 0;
 191                 }
 192                 break;
 193         case 2:
 194                 if (nomem) {
 195                         if (ipvs->old_secure_tcp < 2)
 196                                 to_change = 1;
 197                 } else {
 198                         if (ipvs->old_secure_tcp >= 2)
 199                                 to_change = 0;
 200                         ipvs->sysctl_secure_tcp = 1;
 201                 }
 202                 break;
 203         case 3:
 204                 if (ipvs->old_secure_tcp < 2)
 205                         to_change = 1;
 206                 break;
 207         }
 208         ipvs->old_secure_tcp = ipvs->sysctl_secure_tcp;
 209         if (to_change >= 0)
 210                 ip_vs_protocol_timeout_change(ipvs,
 211                                               ipvs->sysctl_secure_tcp > 1);
 212         spin_unlock(&ipvs->securetcp_lock);
 213
 214         local_bh_enable();
 215 }
 216
 217
 218 /*
 219  *      Timer for checking the defense
 220  */
 221 #define DEFENSE_TIMER_PERIOD    1*HZ
 222
 223 static void defense_work_handler(struct work_struct *work)
 224 {
 225         struct netns_ipvs *ipvs =
 226                 container_of(work, struct netns_ipvs, defense_work.work);
 227
 228         update_defense_level(ipvs);
 229         if (atomic_read(&ipvs->dropentry))
 230                 ip_vs_random_dropentry(ipvs);
 231         schedule_delayed_work(&ipvs->defense_work, DEFENSE_TIMER_PERIOD);
 232 }
 233 #endif
 234
 235 int
 236 ip_vs_use_count_inc(void)
 237 {
 238         return try_module_get(THIS_MODULE);
 239 }
 240
 241 void
 242 ip_vs_use_count_dec(void)
 243 {
 244         module_put(THIS_MODULE);
 245 }
 246
 247
 248 /*
 249  *      Hash table: for virtual service lookups
 250  */
 251 #define IP_VS_SVC_TAB_BITS 8
 252 #define IP_VS_SVC_TAB_SIZE (1 << IP_VS_SVC_TAB_BITS)
 253 #define IP_VS_SVC_TAB_MASK (IP_VS_SVC_TAB_SIZE - 1)
 254
 255 /* the service table hashed by <protocol, addr, port> */
 256 static struct hlist_head ip_vs_svc_table[IP_VS_SVC_TAB_SIZE];
 257 /* the service table hashed by fwmark */
 258 static struct hlist_head ip_vs_svc_fwm_table[IP_VS_SVC_TAB_SIZE];
 259
 260
 261 /*
 262  *      Returns hash value for virtual service
 263  */
 264 static inline unsigned int
 265 ip_vs_svc_hashkey(struct netns_ipvs *ipvs, int af, unsigned int proto,
 266                   const union nf_inet_addr *addr, __be16 port)
 267 {
 268         register unsigned int porth = ntohs(port);
 269         __be32 addr_fold = addr->ip;
 270         __u32 ahash;
 271
 272 #ifdef CONFIG_IP_VS_IPV6
 273         if (af == AF_INET6)
 274                 addr_fold = addr->ip6[0]^addr->ip6[1]^
 275                             addr->ip6[2]^addr->ip6[3];
 276 #endif
 277         ahash = ntohl(addr_fold);
 278         ahash ^= ((size_t) ipvs >> 8);
 279
 280         return (proto ^ ahash ^ (porth >> IP_VS_SVC_TAB_BITS) ^ porth) &
 281                IP_VS_SVC_TAB_MASK;
 282 }
 283
 284 /*
 285  *      Returns hash value of fwmark for virtual service lookup
 286  */
 287 static inline unsigned int ip_vs_svc_fwm_hashkey(struct netns_ipvs *ipvs, __u32 fwmark)
 288 {
 289         return (((size_t)ipvs>>8) ^ fwmark) & IP_VS_SVC_TAB_MASK;
 290 }
 291
 292 /*
 293  *      Hashes a service in the ip_vs_svc_table by <netns,proto,addr,port>
 294  *      or in the ip_vs_svc_fwm_table by fwmark.
 295  *      Should be called with locked tables.
 296  */
 297 static int ip_vs_svc_hash(struct ip_vs_service *svc)
 298 {
 299         unsigned int hash;
 300
 301         if (svc->flags & IP_VS_SVC_F_HASHED) {
 302                 pr_err("%s(): request for already hashed, called from %pF\n",
 303                        __func__, __builtin_return_address(0));
 304                 return 0;
 305         }
 306
 307         if (svc->fwmark == 0) {
 308                 /*
 309                  *  Hash it by <netns,protocol,addr,port> in ip_vs_svc_table
 310                  */
 311                 hash = ip_vs_svc_hashkey(svc->ipvs, svc->af, svc->protocol,
 312                                          &svc->addr, svc->port);
 313                 hlist_add_head_rcu(&svc->s_list, &ip_vs_svc_table[hash]);
 314         } else {
 315                 /*
 316                  *  Hash it by fwmark in svc_fwm_table
 317                  */
 318                 hash = ip_vs_svc_fwm_hashkey(svc->ipvs, svc->fwmark);
 319                 hlist_add_head_rcu(&svc->f_list, &ip_vs_svc_fwm_table[hash]);
 320         }
 321
 322         svc->flags |= IP_VS_SVC_F_HASHED;
 323         /* increase its refcnt because it is referenced by the svc table */
 324         atomic_inc(&svc->refcnt);
 325         return 1;
 326 }
 327
 328
 329 /*
 330  *      Unhashes a service from svc_table / svc_fwm_table.
 331  *      Should be called with locked tables.
 332  */
 333 static int ip_vs_svc_unhash(struct ip_vs_service *svc)
 334 {
 335         if (!(svc->flags & IP_VS_SVC_F_HASHED)) {
 336                 pr_err("%s(): request for unhash flagged, called from %pF\n",
 337                        __func__, __builtin_return_address(0));
 338                 return 0;
 339         }
 340
 341         if (svc->fwmark == 0) {
 342                 /* Remove it from the svc_table table */
 343                 hlist_del_rcu(&svc->s_list);
 344         } else {
 345                 /* Remove it from the svc_fwm_table table */
 346                 hlist_del_rcu(&svc->f_list);
 347         }
 348
 349         svc->flags &= ~IP_VS_SVC_F_HASHED;
 350         atomic_dec(&svc->refcnt);
 351         return 1;
 352 }
 353
 354
 355 /*
 356  *      Get service by {netns, proto,addr,port} in the service table.
 357  */
 358 static inline struct ip_vs_service *
 359 __ip_vs_service_find(struct netns_ipvs *ipvs, int af, __u16 protocol,
 360                      const union nf_inet_addr *vaddr, __be16 vport)
 361 {
 362         unsigned int hash;
 363         struct ip_vs_service *svc;
 364
 365         /* Check for "full" addressed entries */
 366         hash = ip_vs_svc_hashkey(ipvs, af, protocol, vaddr, vport);
 367
 368         hlist_for_each_entry_rcu(svc, &ip_vs_svc_table[hash], s_list) {
 369                 if ((svc->af == af)
 370                     && ip_vs_addr_equal(af, &svc->addr, vaddr)
 371                     && (svc->port == vport)
 372                     && (svc->protocol == protocol)
 373                     && (svc->ipvs == ipvs)) {
 374                         /* HIT */
 375                         return svc;
 376                 }
 377         }
 378
 379         return NULL;
 380 }
 381
 382
 383 /*
 384  *      Get service by {fwmark} in the service table.
 385  */
 386 static inline struct ip_vs_service *
 387 __ip_vs_svc_fwm_find(struct netns_ipvs *ipvs, int af, __u32 fwmark)
 388 {
 389         unsigned int hash;
 390         struct ip_vs_service *svc;
 391
 392         /* Check for fwmark addressed entries */
 393         hash = ip_vs_svc_fwm_hashkey(ipvs, fwmark);
 394
 395         hlist_for_each_entry_rcu(svc, &ip_vs_svc_fwm_table[hash], f_list) {
 396                 if (svc->fwmark == fwmark && svc->af == af
 397                     && (svc->ipvs == ipvs)) {
 398                         /* HIT */
 399                         return svc;
 400                 }
 401         }
 402
 403         return NULL;
 404 }
 405
 406 /* Find service, called under RCU lock */
 407 struct ip_vs_service *
 408 ip_vs_service_find(struct netns_ipvs *ipvs, int af, __u32 fwmark, __u16 protocol,
 409                    const union nf_inet_addr *vaddr, __be16 vport)
 410 {
 411         struct ip_vs_service *svc;
 412
 413         /*
 414          *      Check the table hashed by fwmark first
 415          */
 416         if (fwmark) {
 417                 svc = __ip_vs_svc_fwm_find(ipvs, af, fwmark);
 418                 if (svc)
 419                         goto out;
 420         }
 421
 422         /*
 423          *      Check the table hashed by <protocol,addr,port>
 424          *      for "full" addressed entries
 425          */
 426         svc = __ip_vs_service_find(ipvs, af, protocol, vaddr, vport);
 427
 428         if (svc == NULL
 429             && protocol == IPPROTO_TCP
 430             && atomic_read(&ipvs->ftpsvc_counter)
 431             && (vport == FTPDATA || ntohs(vport) >= PROT_SOCK)) {
 432                 /*
 433                  * Check if ftp service entry exists, the packet
 434                  * might belong to FTP data connections.
 435                  */
 436                 svc = __ip_vs_service_find(ipvs, af, protocol, vaddr, FTPPORT);
 437         }
 438
 439         if (svc == NULL
 440             && atomic_read(&ipvs->nullsvc_counter)) {
 441                 /*
 442                  * Check if the catch-all port (port zero) exists
 443                  */
 444                 svc = __ip_vs_service_find(ipvs, af, protocol, vaddr, 0);
 445         }
 446
 447   out:
 448         IP_VS_DBG_BUF(9, "lookup service: fwm %u %s %s:%u %s\n",
 449                       fwmark, ip_vs_proto_name(protocol),
 450                       IP_VS_DBG_ADDR(af, vaddr), ntohs(vport),
 451                       svc ? "hit" : "not hit");
 452
 453         return svc;
 454 }
 455
 456
 457 static inline void
 458 __ip_vs_bind_svc(struct ip_vs_dest *dest, struct ip_vs_service *svc)
 459 {
 460         atomic_inc(&svc->refcnt);
 461         rcu_assign_pointer(dest->svc, svc);
 462 }
 463
 464 static void ip_vs_service_free(struct ip_vs_service *svc)
 465 {
 466         free_percpu(svc->stats.cpustats);
 467         kfree(svc);
 468 }
 469
 470 static void ip_vs_service_rcu_free(struct rcu_head *head)
 471 {
 472         struct ip_vs_service *svc;
 473
 474         svc = container_of(head, struct ip_vs_service, rcu_head);
 475         ip_vs_service_free(svc);
 476 }
 477
 478 static void __ip_vs_svc_put(struct ip_vs_service *svc, bool do_delay)
 479 {
 480         if (atomic_dec_and_test(&svc->refcnt)) {
 481                 IP_VS_DBG_BUF(3, "Removing service %u/%s:%u\n",
 482                               svc->fwmark,
 483                               IP_VS_DBG_ADDR(svc->af, &svc->addr),
 484                               ntohs(svc->port));
 485                 if (do_delay)
 486                         call_rcu(&svc->rcu_head, ip_vs_service_rcu_free);
 487                 else
 488                         ip_vs_service_free(svc);
 489         }
 490 }
 491
 492
 493 /*
 494  *      Returns hash value for real service
 495  */
 496 static inline unsigned int ip_vs_rs_hashkey(int af,
 497                                             const union nf_inet_addr *addr,
 498                                             __be16 port)
 499 {
 500         register unsigned int porth = ntohs(port);
 501         __be32 addr_fold = addr->ip;
 502
 503 #ifdef CONFIG_IP_VS_IPV6
 504         if (af == AF_INET6)
 505                 addr_fold = addr->ip6[0]^addr->ip6[1]^
 506                             addr->ip6[2]^addr->ip6[3];
 507 #endif
 508
 509         return (ntohl(addr_fold)^(porth>>IP_VS_RTAB_BITS)^porth)
 510                 & IP_VS_RTAB_MASK;
 511 }
 512
 513 /* Hash ip_vs_dest in rs_table by <proto,addr,port>. */
 514 static void ip_vs_rs_hash(struct netns_ipvs *ipvs, struct ip_vs_dest *dest)
 515 {
 516         unsigned int hash;
 517
 518         if (dest->in_rs_table)
 519                 return;
 520
 521         /*
 522          *      Hash by proto,addr,port,
 523          *      which are the parameters of the real service.
 524          */
 525         hash = ip_vs_rs_hashkey(dest->af, &dest->addr, dest->port);
 526
 527         hlist_add_head_rcu(&dest->d_list, &ipvs->rs_table[hash]);
 528         dest->in_rs_table = 1;
 529 }
 530
 531 /* Unhash ip_vs_dest from rs_table. */
 532 static void ip_vs_rs_unhash(struct ip_vs_dest *dest)
 533 {
 534         /*
 535          * Remove it from the rs_table table.
 536          */
 537         if (dest->in_rs_table) {
 538                 hlist_del_rcu(&dest->d_list);
 539                 dest->in_rs_table = 0;
 540         }
 541 }
 542
 543 /* Check if real service by <proto,addr,port> is present */
 544 bool ip_vs_has_real_service(struct netns_ipvs *ipvs, int af, __u16 protocol,
 545                             const union nf_inet_addr *daddr, __be16 dport)
 546 {
 547         unsigned int hash;
 548         struct ip_vs_dest *dest;
 549
 550         /* Check for "full" addressed entries */
 551         hash = ip_vs_rs_hashkey(af, daddr, dport);
 552
 553         rcu_read_lock();
 554         hlist_for_each_entry_rcu(dest, &ipvs->rs_table[hash], d_list) {
 555                 if (dest->port == dport &&
 556                     dest->af == af &&
 557                     ip_vs_addr_equal(af, &dest->addr, daddr) &&
 558                     (dest->protocol == protocol || dest->vfwmark)) {
 559                         /* HIT */
 560                         rcu_read_unlock();
 561                         return true;
 562                 }
 563         }
 564         rcu_read_unlock();
 565
 566         return false;
 567 }
 568
 569 /* Find real service record by <proto,addr,port>.
 570  * In case of multiple records with the same <proto,addr,port>, only
 571  * the first found record is returned.
 572  *
 573  * To be called under RCU lock.
 574  */
 575 struct ip_vs_dest *ip_vs_find_real_service(struct netns_ipvs *ipvs, int af,
 576                                            __u16 protocol,
 577                                            const union nf_inet_addr *daddr,
 578                                            __be16 dport)
 579 {
 580         unsigned int hash;
 581         struct ip_vs_dest *dest;
 582
 583         /* Check for "full" addressed entries */
 584         hash = ip_vs_rs_hashkey(af, daddr, dport);
 585
 586         hlist_for_each_entry_rcu(dest, &ipvs->rs_table[hash], d_list) {
 587                 if (dest->port == dport &&
 588                     dest->af == af &&
 589                     ip_vs_addr_equal(af, &dest->addr, daddr) &&
 590                         (dest->protocol == protocol || dest->vfwmark)) {
 591                         /* HIT */
 592                         return dest;
 593                 }
 594         }
 595
 596         return NULL;
 597 }
 598
 599 /* Lookup destination by {addr,port} in the given service
 600  * Called under RCU lock.
 601  */
 602 static struct ip_vs_dest *
 603 ip_vs_lookup_dest(struct ip_vs_service *svc, int dest_af,
 604                   const union nf_inet_addr *daddr, __be16 dport)
 605 {
 606         struct ip_vs_dest *dest;
 607
 608         /*
 609          * Find the destination for the given service
 610          */
 611         list_for_each_entry_rcu(dest, &svc->destinations, n_list) {
 612                 if ((dest->af == dest_af) &&
 613                     ip_vs_addr_equal(dest_af, &dest->addr, daddr) &&
 614                     (dest->port == dport)) {
 615                         /* HIT */
 616                         return dest;
 617                 }
 618         }
 619
 620         return NULL;
 621 }
 622
 623 /*
 624  * Find destination by {daddr,dport,vaddr,protocol}
 625  * Created to be used in ip_vs_process_message() in
 626  * the backup synchronization daemon. It finds the
 627  * destination to be bound to the received connection
 628  * on the backup.
 629  * Called under RCU lock, no refcnt is returned.
 630  */
 631 struct ip_vs_dest *ip_vs_find_dest(struct netns_ipvs *ipvs, int svc_af, int dest_af,
 632                                    const union nf_inet_addr *daddr,
 633                                    __be16 dport,
 634                                    const union nf_inet_addr *vaddr,
 635                                    __be16 vport, __u16 protocol, __u32 fwmark,
 636                                    __u32 flags)
 637 {
 638         struct ip_vs_dest *dest;
 639         struct ip_vs_service *svc;
 640         __be16 port = dport;
 641
 642         svc = ip_vs_service_find(ipvs, svc_af, fwmark, protocol, vaddr, vport);
 643         if (!svc)
 644                 return NULL;
 645         if (fwmark && (flags & IP_VS_CONN_F_FWD_MASK) != IP_VS_CONN_F_MASQ)
 646                 port = 0;
 647         dest = ip_vs_lookup_dest(svc, dest_af, daddr, port);
 648         if (!dest)
 649                 dest = ip_vs_lookup_dest(svc, dest_af, daddr, port ^ dport);
 650         return dest;
 651 }
 652
 653 void ip_vs_dest_dst_rcu_free(struct rcu_head *head)
 654 {
 655         struct ip_vs_dest_dst *dest_dst = container_of(head,
 656                                                        struct ip_vs_dest_dst,
 657                                                        rcu_head);
 658
 659         dst_release(dest_dst->dst_cache);
 660         kfree(dest_dst);
 661 }
 662
 663 /* Release dest_dst and dst_cache for dest in user context */
 664 static void __ip_vs_dst_cache_reset(struct ip_vs_dest *dest)
 665 {
 666         struct ip_vs_dest_dst *old;
 667
 668         old = rcu_dereference_protected(dest->dest_dst, 1);
 669         if (old) {
 670                 RCU_INIT_POINTER(dest->dest_dst, NULL);
 671                 call_rcu(&old->rcu_head, ip_vs_dest_dst_rcu_free);
 672         }
 673 }
 674
 675 /*
 676  *  Lookup dest by {svc,addr,port} in the destination trash.
 677  *  The destination trash is used to hold the destinations that are removed
 678  *  from the service table but are still referenced by some conn entries.
 679  *  The reason to add the destination trash is when the dest is temporary
 680  *  down (either by administrator or by monitor program), the dest can be
 681  *  picked back from the trash, the remaining connections to the dest can
 682  *  continue, and the counting information of the dest is also useful for
 683  *  scheduling.
 684  */
 685 static struct ip_vs_dest *
 686 ip_vs_trash_get_dest(struct ip_vs_service *svc, int dest_af,
 687                      const union nf_inet_addr *daddr, __be16 dport)
 688 {
 689         struct ip_vs_dest *dest;
 690         struct netns_ipvs *ipvs = svc->ipvs;
 691
 692         /*
 693          * Find the destination in trash
 694          */
 695         spin_lock_bh(&ipvs->dest_trash_lock);
 696         list_for_each_entry(dest, &ipvs->dest_trash, t_list) {
 697                 IP_VS_DBG_BUF(3, "Destination %u/%s:%u still in trash, "
 698                               "dest->refcnt=%d\n",
 699                               dest->vfwmark,
 700                               IP_VS_DBG_ADDR(dest->af, &dest->addr),
 701                               ntohs(dest->port),
 702                               atomic_read(&dest->refcnt));
 703                 if (dest->af == dest_af &&
 704                     ip_vs_addr_equal(dest_af, &dest->addr, daddr) &&
 705                     dest->port == dport &&
 706                     dest->vfwmark == svc->fwmark &&
 707                     dest->protocol == svc->protocol &&
 708                     (svc->fwmark ||
 709                      (ip_vs_addr_equal(svc->af, &dest->vaddr, &svc->addr) &&
 710                       dest->vport == svc->port))) {
 711                         /* HIT */
 712                         list_del(&dest->t_list);
 713                         ip_vs_dest_hold(dest);
 714                         goto out;
 715                 }
 716         }
 717
 718         dest = NULL;
 719
 720 out:
 721         spin_unlock_bh(&ipvs->dest_trash_lock);
 722
 723         return dest;
 724 }
 725
 726 static void ip_vs_dest_free(struct ip_vs_dest *dest)
 727 {
 728         struct ip_vs_service *svc = rcu_dereference_protected(dest->svc, 1);
 729
 730         __ip_vs_dst_cache_reset(dest);
 731         __ip_vs_svc_put(svc, false);
 732         free_percpu(dest->stats.cpustats);
 733         ip_vs_dest_put_and_free(dest);
 734 }
 735
 736 /*
 737  *  Clean up all the destinations in the trash
 738  *  Called by the ip_vs_control_cleanup()
 739  *
 740  *  When the ip_vs_control_clearup is activated by ipvs module exit,
 741  *  the service tables must have been flushed and all the connections
 742  *  are expired, and the refcnt of each destination in the trash must
 743  *  be 0, so we simply release them here.
 744  */
 745 static void ip_vs_trash_cleanup(struct netns_ipvs *ipvs)
 746 {
 747         struct ip_vs_dest *dest, *nxt;
 748
 749         del_timer_sync(&ipvs->dest_trash_timer);
 750         /* No need to use dest_trash_lock */
 751         list_for_each_entry_safe(dest, nxt, &ipvs->dest_trash, t_list) {
 752                 list_del(&dest->t_list);
 753                 ip_vs_dest_free(dest);
 754         }
 755 }
 756
 757 static void
 758 ip_vs_copy_stats(struct ip_vs_kstats *dst, struct ip_vs_stats *src)
 759 {
 760 #define IP_VS_SHOW_STATS_COUNTER(c) dst->c = src->kstats.c - src->kstats0.c
 761
 762         spin_lock_bh(&src->lock);
 763
 764         IP_VS_SHOW_STATS_COUNTER(conns);
 765         IP_VS_SHOW_STATS_COUNTER(inpkts);
 766         IP_VS_SHOW_STATS_COUNTER(outpkts);
 767         IP_VS_SHOW_STATS_COUNTER(inbytes);
 768         IP_VS_SHOW_STATS_COUNTER(outbytes);
 769
 770         ip_vs_read_estimator(dst, src);
 771
 772         spin_unlock_bh(&src->lock);
 773 }
 774
 775 static void
 776 ip_vs_export_stats_user(struct ip_vs_stats_user *dst, struct ip_vs_kstats *src)
 777 {
 778         dst->conns = (u32)src->conns;
 779         dst->inpkts = (u32)src->inpkts;
 780         dst->outpkts = (u32)src->outpkts;
 781         dst->inbytes = src->inbytes;
 782         dst->outbytes = src->outbytes;
 783         dst->cps = (u32)src->cps;
 784         dst->inpps = (u32)src->inpps;
 785         dst->outpps = (u32)src->outpps;
 786         dst->inbps = (u32)src->inbps;
 787         dst->outbps = (u32)src->outbps;
 788 }
 789
 790 static void
 791 ip_vs_zero_stats(struct ip_vs_stats *stats)
 792 {
 793         spin_lock_bh(&stats->lock);
 794
 795         /* get current counters as zero point, rates are zeroed */
 796
 797 #define IP_VS_ZERO_STATS_COUNTER(c) stats->kstats0.c = stats->kstats.c
 798
 799         IP_VS_ZERO_STATS_COUNTER(conns);
 800         IP_VS_ZERO_STATS_COUNTER(inpkts);
 801         IP_VS_ZERO_STATS_COUNTER(outpkts);
 802         IP_VS_ZERO_STATS_COUNTER(inbytes);
 803         IP_VS_ZERO_STATS_COUNTER(outbytes);
 804
 805         ip_vs_zero_estimator(stats);
 806
 807         spin_unlock_bh(&stats->lock);
 808 }
 809
 810 /*
 811  *      Update a destination in the given service
 812  */
 813 static void
 814 __ip_vs_update_dest(struct ip_vs_service *svc, struct ip_vs_dest *dest,
 815                     struct ip_vs_dest_user_kern *udest, int add)
 816 {
 817         struct netns_ipvs *ipvs = svc->ipvs;
 818         struct ip_vs_service *old_svc;
 819         struct ip_vs_scheduler *sched;
 820         int conn_flags;
 821
 822         /* We cannot modify an address and change the address family */
 823         BUG_ON(!add && udest->af != dest->af);
 824
 825         if (add && udest->af != svc->af)
 826                 ipvs->mixed_address_family_dests++;
 827
 828         /* set the weight and the flags */
 829         atomic_set(&dest->weight, udest->weight);
 830         conn_flags = udest->conn_flags & IP_VS_CONN_F_DEST_MASK;
 831         conn_flags |= IP_VS_CONN_F_INACTIVE;
 832
 833         /* set the IP_VS_CONN_F_NOOUTPUT flag if not masquerading/NAT */
 834         if ((conn_flags & IP_VS_CONN_F_FWD_MASK) != IP_VS_CONN_F_MASQ) {
 835                 conn_flags |= IP_VS_CONN_F_NOOUTPUT;
 836         } else {
 837                 /*
 838                  *    Put the real service in rs_table if not present.
 839                  *    For now only for NAT!
 840                  */
 841                 ip_vs_rs_hash(ipvs, dest);
 842         }
 843         atomic_set(&dest->conn_flags, conn_flags);
 844
 845         /* bind the service */
 846         old_svc = rcu_dereference_protected(dest->svc, 1);
 847         if (!old_svc) {
 848                 __ip_vs_bind_svc(dest, svc);
 849         } else {
 850                 if (old_svc != svc) {
 851                         ip_vs_zero_stats(&dest->stats);
 852                         __ip_vs_bind_svc(dest, svc);
 853                         __ip_vs_svc_put(old_svc, true);
 854                 }
 855         }
 856
 857         /* set the dest status flags */
 858         dest->flags |= IP_VS_DEST_F_AVAILABLE;
 859
 860         if (udest->u_threshold == 0 || udest->u_threshold > dest->u_threshold)
 861                 dest->flags &= ~IP_VS_DEST_F_OVERLOAD;
 862         dest->u_threshold = udest->u_threshold;
 863         dest->l_threshold = udest->l_threshold;
 864
 865         dest->af = udest->af;
 866
 867         spin_lock_bh(&dest->dst_lock);
 868         __ip_vs_dst_cache_reset(dest);
 869         spin_unlock_bh(&dest->dst_lock);
 870
 871         if (add) {
 872                 ip_vs_start_estimator(svc->ipvs, &dest->stats);
 873                 list_add_rcu(&dest->n_list, &svc->destinations);
 874                 svc->num_dests++;
 875                 sched = rcu_dereference_protected(svc->scheduler, 1);
 876                 if (sched && sched->add_dest)
 877                         sched->add_dest(svc, dest);
 878         } else {
 879                 sched = rcu_dereference_protected(svc->scheduler, 1);
 880                 if (sched && sched->upd_dest)
 881                         sched->upd_dest(svc, dest);
 882         }
 883 }
 884
 885
 886 /*
 887  *      Create a destination for the given service
 888  */
 889 static int
 890 ip_vs_new_dest(struct ip_vs_service *svc, struct ip_vs_dest_user_kern *udest,
 891                struct ip_vs_dest **dest_p)
 892 {
 893         struct ip_vs_dest *dest;
 894         unsigned int atype, i;
 895
 896         EnterFunction(2);
 897
 898 #ifdef CONFIG_IP_VS_IPV6
 899         if (udest->af == AF_INET6) {
 900                 atype = ipv6_addr_type(&udest->addr.in6);
 901                 if ((!(atype & IPV6_ADDR_UNICAST) ||
 902                         atype & IPV6_ADDR_LINKLOCAL) &&
 903                         !__ip_vs_addr_is_local_v6(svc->ipvs->net, &udest->addr.in6))
 904                         return -EINVAL;
 905         } else
 906 #endif
 907         {
 908                 atype = inet_addr_type(svc->ipvs->net, udest->addr.ip);
 909                 if (atype != RTN_LOCAL && atype != RTN_UNICAST)
 910                         return -EINVAL;
 911         }
 912
 913         dest = kzalloc(sizeof(struct ip_vs_dest), GFP_KERNEL);
 914         if (dest == NULL)
 915                 return -ENOMEM;
 916
 917         dest->stats.cpustats = alloc_percpu(struct ip_vs_cpu_stats);
 918         if (!dest->stats.cpustats)
 919                 goto err_alloc;
 920
 921         for_each_possible_cpu(i) {
 922                 struct ip_vs_cpu_stats *ip_vs_dest_stats;
 923                 ip_vs_dest_stats = per_cpu_ptr(dest->stats.cpustats, i);
 924                 u64_stats_init(&ip_vs_dest_stats->syncp);
 925         }
 926
 927         dest->af = udest->af;
 928         dest->protocol = svc->protocol;
 929         dest->vaddr = svc->addr;
 930         dest->vport = svc->port;
 931         dest->vfwmark = svc->fwmark;
 932         ip_vs_addr_copy(udest->af, &dest->addr, &udest->addr);
 933         dest->port = udest->port;
 934
 935         atomic_set(&dest->activeconns, 0);
 936         atomic_set(&dest->inactconns, 0);
 937         atomic_set(&dest->persistconns, 0);
 938         atomic_set(&dest->refcnt, 1);
 939
 940         INIT_HLIST_NODE(&dest->d_list);
 941         spin_lock_init(&dest->dst_lock);
 942         spin_lock_init(&dest->stats.lock);
 943         __ip_vs_update_dest(svc, dest, udest, 1);
 944
 945         *dest_p = dest;
 946
 947         LeaveFunction(2);
 948         return 0;
 949
 950 err_alloc:
 951         kfree(dest);
 952         return -ENOMEM;
 953 }
 954
 955
 956 /*
 957  *      Add a destination into an existing service
 958  */
 959 static int
 960 ip_vs_add_dest(struct ip_vs_service *svc, struct ip_vs_dest_user_kern *udest)
 961 {
 962         struct ip_vs_dest *dest;
 963         union nf_inet_addr daddr;
 964         __be16 dport = udest->port;
 965         int ret;
 966
 967         EnterFunction(2);
 968
 969         if (udest->weight < 0) {
 970                 pr_err("%s(): server weight less than zero\n", __func__);
 971                 return -ERANGE;
 972         }
 973
 974         if (udest->l_threshold > udest->u_threshold) {
 975                 pr_err("%s(): lower threshold is higher than upper threshold\n",
 976                         __func__);
 977                 return -ERANGE;
 978         }
 979
 980         ip_vs_addr_copy(udest->af, &daddr, &udest->addr);
 981
 982         /* We use function that requires RCU lock */
 983         rcu_read_lock();
 984         dest = ip_vs_lookup_dest(svc, udest->af, &daddr, dport);
 985         rcu_read_unlock();
 986
 987         if (dest != NULL) {
 988                 IP_VS_DBG(1, "%s(): dest already exists\n", __func__);
 989                 return -EEXIST;
 990         }
 991
 992         /*
 993          * Check if the dest already exists in the trash and
 994          * is from the same service
 995          */
 996         dest = ip_vs_trash_get_dest(svc, udest->af, &daddr, dport);
 997
 998         if (dest != NULL) {
 999                 IP_VS_DBG_BUF(3, "Get destination %s:%u from trash, "
1000                               "dest->refcnt=%d, service %u/%s:%u\n",
1001                               IP_VS_DBG_ADDR(udest->af, &daddr), ntohs(dport),
1002                               atomic_read(&dest->refcnt),
1003                               dest->vfwmark,
1004                               IP_VS_DBG_ADDR(svc->af, &dest->vaddr),
1005                               ntohs(dest->vport));
1006
1007                 __ip_vs_update_dest(svc, dest, udest, 1);
1008                 ret = 0;
1009         } else {
1010                 /*
1011                  * Allocate and initialize the dest structure
1012                  */
1013                 ret = ip_vs_new_dest(svc, udest, &dest);
1014         }
1015         LeaveFunction(2);
1016
1017         return ret;
1018 }
1019
1020
1021 /*
1022  *      Edit a destination in the given service
1023  */
1024 static int
1025 ip_vs_edit_dest(struct ip_vs_service *svc, struct ip_vs_dest_user_kern *udest)
1026 {
1027         struct ip_vs_dest *dest;
1028         union nf_inet_addr daddr;
1029         __be16 dport = udest->port;
1030
1031         EnterFunction(2);
1032
1033         if (udest->weight < 0) {
1034                 pr_err("%s(): server weight less than zero\n", __func__);
1035                 return -ERANGE;
1036         }
1037
1038         if (udest->l_threshold > udest->u_threshold) {
1039                 pr_err("%s(): lower threshold is higher than upper threshold\n",
1040                         __func__);
1041                 return -ERANGE;
1042         }
1043
1044         ip_vs_addr_copy(udest->af, &daddr, &udest->addr);
1045
1046         /* We use function that requires RCU lock */
1047         rcu_read_lock();
1048         dest = ip_vs_lookup_dest(svc, udest->af, &daddr, dport);
1049         rcu_read_unlock();
1050
1051         if (dest == NULL) {
1052                 IP_VS_DBG(1, "%s(): dest doesn't exist\n", __func__);
1053                 return -ENOENT;
1054         }
1055
1056         __ip_vs_update_dest(svc, dest, udest, 0);
1057         LeaveFunction(2);
1058
1059         return 0;
1060 }
1061
1062 /*
1063  *      Delete a destination (must be already unlinked from the service)
1064  */
1065 static void __ip_vs_del_dest(struct netns_ipvs *ipvs, struct ip_vs_dest *dest,
1066                              bool cleanup)
1067 {
1068         ip_vs_stop_estimator(ipvs, &dest->stats);
1069
1070         /*
1071          *  Remove it from the d-linked list with the real services.
1072          */
1073         ip_vs_rs_unhash(dest);
1074
1075         spin_lock_bh(&ipvs->dest_trash_lock);
1076         IP_VS_DBG_BUF(3, "Moving dest %s:%u into trash, dest->refcnt=%d\n",
1077                       IP_VS_DBG_ADDR(dest->af, &dest->addr), ntohs(dest->port),
1078                       atomic_read(&dest->refcnt));
1079         if (list_empty(&ipvs->dest_trash) && !cleanup)
1080                 mod_timer(&ipvs->dest_trash_timer,
1081                           jiffies + (IP_VS_DEST_TRASH_PERIOD >> 1));
1082         /* dest lives in trash without reference */
1083         list_add(&dest->t_list, &ipvs->dest_trash);
1084         dest->idle_start = 0;
1085         spin_unlock_bh(&ipvs->dest_trash_lock);
1086         ip_vs_dest_put(dest);
1087 }
1088
1089
1090 /*
1091  *      Unlink a destination from the given service
1092  */
1093 static void __ip_vs_unlink_dest(struct ip_vs_service *svc,
1094                                 struct ip_vs_dest *dest,
1095                                 int svcupd)
1096 {
1097         dest->flags &= ~IP_VS_DEST_F_AVAILABLE;
1098
1099         /*
1100          *  Remove it from the d-linked destination list.
1101          */
1102         list_del_rcu(&dest->n_list);
1103         svc->num_dests--;
1104
1105         if (dest->af != svc->af)
1106                 svc->ipvs->mixed_address_family_dests--;
1107
1108         if (svcupd) {
1109                 struct ip_vs_scheduler *sched;
1110
1111                 sched = rcu_dereference_protected(svc->scheduler, 1);
1112                 if (sched && sched->del_dest)
1113                         sched->del_dest(svc, dest);
1114         }
1115 }
1116
1117
1118 /*
1119  *      Delete a destination server in the given service
1120  */
1121 static int
1122 ip_vs_del_dest(struct ip_vs_service *svc, struct ip_vs_dest_user_kern *udest)
1123 {
1124         struct ip_vs_dest *dest;
1125         __be16 dport = udest->port;
1126
1127         EnterFunction(2);
1128
1129         /* We use function that requires RCU lock */
1130         rcu_read_lock();
1131         dest = ip_vs_lookup_dest(svc, udest->af, &udest->addr, dport);
1132         rcu_read_unlock();
1133
1134         if (dest == NULL) {
1135                 IP_VS_DBG(1, "%s(): destination not found!\n", __func__);
1136                 return -ENOENT;
1137         }
1138
1139         /*
1140          *      Unlink dest from the service
1141          */
1142         __ip_vs_unlink_dest(svc, dest, 1);
1143
1144         /*
1145          *      Delete the destination
1146          */
1147         __ip_vs_del_dest(svc->ipvs, dest, false);
1148
1149         LeaveFunction(2);
1150
1151         return 0;
1152 }
1153
1154 static void ip_vs_dest_trash_expire(unsigned long data)
1155 {
1156         struct netns_ipvs *ipvs = (struct netns_ipvs *)data;
1157         struct ip_vs_dest *dest, *next;
1158         unsigned long now = jiffies;
1159
1160         spin_lock(&ipvs->dest_trash_lock);
1161         list_for_each_entry_safe(dest, next, &ipvs->dest_trash, t_list) {
1162                 if (atomic_read(&dest->refcnt) > 0)
1163                         continue;
1164                 if (dest->idle_start) {
1165                         if (time_before(now, dest->idle_start +
1166                                              IP_VS_DEST_TRASH_PERIOD))
1167                                 continue;
1168                 } else {
1169                         dest->idle_start = max(1UL, now);
1170                         continue;
1171                 }
1172                 IP_VS_DBG_BUF(3, "Removing destination %u/%s:%u from trash\n",
1173                               dest->vfwmark,
1174                               IP_VS_DBG_ADDR(dest->af, &dest->addr),
1175                               ntohs(dest->port));
1176                 list_del(&dest->t_list);
1177                 ip_vs_dest_free(dest);
1178         }
1179         if (!list_empty(&ipvs->dest_trash))
1180                 mod_timer(&ipvs->dest_trash_timer,
1181                           jiffies + (IP_VS_DEST_TRASH_PERIOD >> 1));
1182         spin_unlock(&ipvs->dest_trash_lock);
1183 }
1184
1185 /*
1186  *      Add a service into the service hash table
1187  */
1188 static int
1189 ip_vs_add_service(struct netns_ipvs *ipvs, struct ip_vs_service_user_kern *u,
1190                   struct ip_vs_service **svc_p)
1191 {
1192         int ret = 0, i;
1193         struct ip_vs_scheduler *sched = NULL;
1194         struct ip_vs_pe *pe = NULL;
1195         struct ip_vs_service *svc = NULL;
1196
1197         /* increase the module use count */
1198         ip_vs_use_count_inc();
1199
1200         /* Lookup the scheduler by 'u->sched_name' */
1201         if (strcmp(u->sched_name, "none")) {
1202                 sched = ip_vs_scheduler_get(u->sched_name);
1203                 if (!sched) {
1204                         pr_info("Scheduler module ip_vs_%s not found\n",
1205                                 u->sched_name);
1206                         ret = -ENOENT;
1207                         goto out_err;
1208                 }
1209         }
1210
1211         if (u->pe_name && *u->pe_name) {
1212                 pe = ip_vs_pe_getbyname(u->pe_name);
1213                 if (pe == NULL) {
1214                         pr_info("persistence engine module ip_vs_pe_%s "
1215                                 "not found\n", u->pe_name);
1216                         ret = -ENOENT;
1217                         goto out_err;
1218                 }
1219         }
1220
1221 #ifdef CONFIG_IP_VS_IPV6
1222         if (u->af == AF_INET6) {
1223                 __u32 plen = (__force __u32) u->netmask;
1224
1225                 if (plen < 1 || plen > 128) {
1226                         ret = -EINVAL;
1227                         goto out_err;
1228                 }
1229         }
1230 #endif
1231
1232         svc = kzalloc(sizeof(struct ip_vs_service), GFP_KERNEL);
1233         if (svc == NULL) {
1234                 IP_VS_DBG(1, "%s(): no memory\n", __func__);
1235                 ret = -ENOMEM;
1236                 goto out_err;
1237         }
1238         svc->stats.cpustats = alloc_percpu(struct ip_vs_cpu_stats);
1239         if (!svc->stats.cpustats) {
1240                 ret = -ENOMEM;
1241                 goto out_err;
1242         }
1243
1244         for_each_possible_cpu(i) {
1245                 struct ip_vs_cpu_stats *ip_vs_stats;
1246                 ip_vs_stats = per_cpu_ptr(svc->stats.cpustats, i);
1247                 u64_stats_init(&ip_vs_stats->syncp);
1248         }
1249
1250
1251         /* I'm the first user of the service */
1252         atomic_set(&svc->refcnt, 0);
1253
1254         svc->af = u->af;
1255         svc->protocol = u->protocol;
1256         ip_vs_addr_copy(svc->af, &svc->addr, &u->addr);
1257         svc->port = u->port;
1258         svc->fwmark = u->fwmark;
1259         svc->flags = u->flags & ~IP_VS_SVC_F_HASHED;
1260         svc->timeout = u->timeout * HZ;
1261         svc->netmask = u->netmask;
1262         svc->ipvs = ipvs;
1263
1264         INIT_LIST_HEAD(&svc->destinations);
1265         spin_lock_init(&svc->sched_lock);
1266         spin_lock_init(&svc->stats.lock);
1267
1268         /* Bind the scheduler */
1269         if (sched) {
1270                 ret = ip_vs_bind_scheduler(svc, sched);
1271                 if (ret)
1272                         goto out_err;
1273                 sched = NULL;
1274         }
1275
1276         /* Bind the ct retriever */
1277         RCU_INIT_POINTER(svc->pe, pe);
1278         pe = NULL;
1279
1280         /* Update the virtual service counters */
1281         if (svc->port == FTPPORT)
1282                 atomic_inc(&ipvs->ftpsvc_counter);
1283         else if (svc->port == 0)
1284                 atomic_inc(&ipvs->nullsvc_counter);
1285         if (svc->pe && svc->pe->conn_out)
1286                 atomic_inc(&ipvs->conn_out_counter);
1287
1288         ip_vs_start_estimator(ipvs, &svc->stats);
1289
1290         /* Count only IPv4 services for old get/setsockopt interface */
1291         if (svc->af == AF_INET)
1292                 ipvs->num_services++;
1293
1294         /* Hash the service into the service table */
1295         ip_vs_svc_hash(svc);
1296
1297         *svc_p = svc;
1298         /* Now there is a service - full throttle */
1299         ipvs->enable = 1;
1300         return 0;
1301
1302
1303  out_err:
1304         if (svc != NULL) {
1305                 ip_vs_unbind_scheduler(svc, sched);
1306                 ip_vs_service_free(svc);
1307         }
1308         ip_vs_scheduler_put(sched);
1309         ip_vs_pe_put(pe);
1310
1311         /* decrease the module use count */
1312         ip_vs_use_count_dec();
1313
1314         return ret;
1315 }
1316
1317
1318 /*
1319  *      Edit a service and bind it with a new scheduler
1320  */
1321 static int
1322 ip_vs_edit_service(struct ip_vs_service *svc, struct ip_vs_service_user_kern *u)
1323 {
1324         struct ip_vs_scheduler *sched = NULL, *old_sched;
1325         struct ip_vs_pe *pe = NULL, *old_pe = NULL;
1326         int ret = 0;
1327         bool new_pe_conn_out, old_pe_conn_out;
1328
1329         /*
1330          * Lookup the scheduler, by 'u->sched_name'
1331          */
1332         if (strcmp(u->sched_name, "none")) {
1333                 sched = ip_vs_scheduler_get(u->sched_name);
1334                 if (!sched) {
1335                         pr_info("Scheduler module ip_vs_%s not found\n",
1336                                 u->sched_name);
1337                         return -ENOENT;
1338                 }
1339         }
1340         old_sched = sched;
1341
1342         if (u->pe_name && *u->pe_name) {
1343                 pe = ip_vs_pe_getbyname(u->pe_name);
1344                 if (pe == NULL) {
1345                         pr_info("persistence engine module ip_vs_pe_%s "
1346                                 "not found\n", u->pe_name);
1347                         ret = -ENOENT;
1348                         goto out;
1349                 }
1350                 old_pe = pe;
1351         }
1352
1353 #ifdef CONFIG_IP_VS_IPV6
1354         if (u->af == AF_INET6) {
1355                 __u32 plen = (__force __u32) u->netmask;
1356
1357                 if (plen < 1 || plen > 128) {
1358                         ret = -EINVAL;
1359                         goto out;
1360                 }
1361         }
1362 #endif
1363
1364         old_sched = rcu_dereference_protected(svc->scheduler, 1);
1365         if (sched != old_sched) {
1366                 if (old_sched) {
1367                         ip_vs_unbind_scheduler(svc, old_sched);
1368                         RCU_INIT_POINTER(svc->scheduler, NULL);
1369                         /* Wait all svc->sched_data users */
1370                         synchronize_rcu();
1371                 }
1372                 /* Bind the new scheduler */
1373                 if (sched) {
1374                         ret = ip_vs_bind_scheduler(svc, sched);
1375                         if (ret) {
1376                                 ip_vs_scheduler_put(sched);
1377                                 goto out;
1378                         }
1379                 }
1380         }
1381
1382         /*
1383          * Set the flags and timeout value
1384          */
1385         svc->flags = u->flags | IP_VS_SVC_F_HASHED;
1386         svc->timeout = u->timeout * HZ;
1387         svc->netmask = u->netmask;
1388
1389         old_pe = rcu_dereference_protected(svc->pe, 1);
1390         if (pe != old_pe) {
1391                 rcu_assign_pointer(svc->pe, pe);
1392                 /* check for optional methods in new pe */
1393                 new_pe_conn_out = (pe && pe->conn_out) ? true : false;
1394                 old_pe_conn_out = (old_pe && old_pe->conn_out) ? true : false;
1395                 if (new_pe_conn_out && !old_pe_conn_out)
1396                         atomic_inc(&svc->ipvs->conn_out_counter);
1397                 if (old_pe_conn_out && !new_pe_conn_out)
1398                         atomic_dec(&svc->ipvs->conn_out_counter);
1399         }
1400
1401 out:
1402         ip_vs_scheduler_put(old_sched);
1403         ip_vs_pe_put(old_pe);
1404         return ret;
1405 }
1406
1407 /*
1408  *      Delete a service from the service list
1409  *      - The service must be unlinked, unlocked and not referenced!
1410  *      - We are called under _bh lock
1411  */
1412 static void __ip_vs_del_service(struct ip_vs_service *svc, bool cleanup)
1413 {
1414         struct ip_vs_dest *dest, *nxt;
1415         struct ip_vs_scheduler *old_sched;
1416         struct ip_vs_pe *old_pe;
1417         struct netns_ipvs *ipvs = svc->ipvs;
1418
1419         /* Count only IPv4 services for old get/setsockopt interface */
1420         if (svc->af == AF_INET)
1421                 ipvs->num_services--;
1422
1423         ip_vs_stop_estimator(svc->ipvs, &svc->stats);
1424
1425         /* Unbind scheduler */
1426         old_sched = rcu_dereference_protected(svc->scheduler, 1);
1427         ip_vs_unbind_scheduler(svc, old_sched);
1428         ip_vs_scheduler_put(old_sched);
1429
1430         /* Unbind persistence engine, keep svc->pe */
1431         old_pe = rcu_dereference_protected(svc->pe, 1);
1432         if (old_pe && old_pe->conn_out)
1433                 atomic_dec(&ipvs->conn_out_counter);
1434         ip_vs_pe_put(old_pe);
1435
1436         /*
1437          *    Unlink the whole destination list
1438          */
1439         list_for_each_entry_safe(dest, nxt, &svc->destinations, n_list) {
1440                 __ip_vs_unlink_dest(svc, dest, 0);
1441                 __ip_vs_del_dest(svc->ipvs, dest, cleanup);
1442         }
1443
1444         /*
1445          *    Update the virtual service counters
1446          */
1447         if (svc->port == FTPPORT)
1448                 atomic_dec(&ipvs->ftpsvc_counter);
1449         else if (svc->port == 0)
1450                 atomic_dec(&ipvs->nullsvc_counter);
1451
1452         /*
1453          *    Free the service if nobody refers to it
1454          */
1455         __ip_vs_svc_put(svc, true);
1456
1457         /* decrease the module use count */
1458         ip_vs_use_count_dec();
1459 }
1460
1461 /*
1462  * Unlink a service from list and try to delete it if its refcnt reached 0
1463  */
1464 static void ip_vs_unlink_service(struct ip_vs_service *svc, bool cleanup)
1465 {
1466         /* Hold svc to avoid double release from dest_trash */
1467         atomic_inc(&svc->refcnt);
1468         /*
1469          * Unhash it from the service table
1470          */
1471         ip_vs_svc_unhash(svc);
1472
1473         __ip_vs_del_service(svc, cleanup);
1474 }
1475
1476 /*
1477  *      Delete a service from the service list
1478  */
1479 static int ip_vs_del_service(struct ip_vs_service *svc)
1480 {
1481         if (svc == NULL)
1482                 return -EEXIST;
1483         ip_vs_unlink_service(svc, false);
1484
1485         return 0;
1486 }
1487
1488
1489 /*
1490  *      Flush all the virtual services
1491  */
1492 static int ip_vs_flush(struct netns_ipvs *ipvs, bool cleanup)
1493 {
1494         int idx;
1495         struct ip_vs_service *svc;
1496         struct hlist_node *n;
1497
1498         /*
1499          * Flush the service table hashed by <netns,protocol,addr,port>
1500          */
1501         for(idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
1502                 hlist_for_each_entry_safe(svc, n, &ip_vs_svc_table[idx],
1503                                           s_list) {
1504                         if (svc->ipvs == ipvs)
1505                                 ip_vs_unlink_service(svc, cleanup);
1506                 }
1507         }
1508
1509         /*
1510          * Flush the service table hashed by fwmark
1511          */
1512         for(idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
1513                 hlist_for_each_entry_safe(svc, n, &ip_vs_svc_fwm_table[idx],
1514                                           f_list) {
1515                         if (svc->ipvs == ipvs)
1516                                 ip_vs_unlink_service(svc, cleanup);
1517                 }
1518         }
1519
1520         return 0;
1521 }
1522
1523 /*
1524  *      Delete service by {netns} in the service table.
1525  *      Called by __ip_vs_cleanup()
1526  */
1527 void ip_vs_service_net_cleanup(struct netns_ipvs *ipvs)
1528 {
1529         EnterFunction(2);
1530         /* Check for "full" addressed entries */
1531         mutex_lock(&__ip_vs_mutex);
1532         ip_vs_flush(ipvs, true);
1533         mutex_unlock(&__ip_vs_mutex);
1534         LeaveFunction(2);
1535 }
1536
1537 /* Put all references for device (dst_cache) */
1538 static inline void
1539 ip_vs_forget_dev(struct ip_vs_dest *dest, struct net_device *dev)
1540 {
1541         struct ip_vs_dest_dst *dest_dst;
1542
1543         spin_lock_bh(&dest->dst_lock);
1544         dest_dst = rcu_dereference_protected(dest->dest_dst, 1);
1545         if (dest_dst && dest_dst->dst_cache->dev == dev) {
1546                 IP_VS_DBG_BUF(3, "Reset dev:%s dest %s:%u ,dest->refcnt=%d\n",
1547                               dev->name,
1548                               IP_VS_DBG_ADDR(dest->af, &dest->addr),
1549                               ntohs(dest->port),
1550                               atomic_read(&dest->refcnt));
1551                 __ip_vs_dst_cache_reset(dest);
1552         }
1553         spin_unlock_bh(&dest->dst_lock);
1554
1555 }
1556 /* Netdev event receiver
1557  * Currently only NETDEV_DOWN is handled to release refs to cached dsts
1558  */
1559 static int ip_vs_dst_event(struct notifier_block *this, unsigned long event,
1560                            void *ptr)
1561 {
1562         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1563         struct net *net = dev_net(dev);
1564         struct netns_ipvs *ipvs = net_ipvs(net);
1565         struct ip_vs_service *svc;
1566         struct ip_vs_dest *dest;
1567         unsigned int idx;
1568
1569         if (event != NETDEV_DOWN || !ipvs)
1570                 return NOTIFY_DONE;
1571         IP_VS_DBG(3, "%s() dev=%s\n", __func__, dev->name);
1572         EnterFunction(2);
1573         mutex_lock(&__ip_vs_mutex);
1574         for (idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
1575                 hlist_for_each_entry(svc, &ip_vs_svc_table[idx], s_list) {
1576                         if (svc->ipvs == ipvs) {
1577                                 list_for_each_entry(dest, &svc->destinations,
1578                                                     n_list) {
1579                                         ip_vs_forget_dev(dest, dev);
1580                                 }
1581                         }
1582                 }
1583
1584                 hlist_for_each_entry(svc, &ip_vs_svc_fwm_table[idx], f_list) {
1585                         if (svc->ipvs == ipvs) {
1586                                 list_for_each_entry(dest, &svc->destinations,
1587                                                     n_list) {
1588                                         ip_vs_forget_dev(dest, dev);
1589                                 }
1590                         }
1591
1592                 }
1593         }
1594
1595         spin_lock_bh(&ipvs->dest_trash_lock);
1596         list_for_each_entry(dest, &ipvs->dest_trash, t_list) {
1597                 ip_vs_forget_dev(dest, dev);
1598         }
1599         spin_unlock_bh(&ipvs->dest_trash_lock);
1600         mutex_unlock(&__ip_vs_mutex);
1601         LeaveFunction(2);
1602         return NOTIFY_DONE;
1603 }
1604
1605 /*
1606  *      Zero counters in a service or all services
1607  */
1608 static int ip_vs_zero_service(struct ip_vs_service *svc)
1609 {
1610         struct ip_vs_dest *dest;
1611
1612         list_for_each_entry(dest, &svc->destinations, n_list) {
1613                 ip_vs_zero_stats(&dest->stats);
1614         }
1615         ip_vs_zero_stats(&svc->stats);
1616         return 0;
1617 }
1618
1619 static int ip_vs_zero_all(struct netns_ipvs *ipvs)
1620 {
1621         int idx;
1622         struct ip_vs_service *svc;
1623
1624         for(idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
1625                 hlist_for_each_entry(svc, &ip_vs_svc_table[idx], s_list) {
1626                         if (svc->ipvs == ipvs)
1627                                 ip_vs_zero_service(svc);
1628                 }
1629         }
1630
1631         for(idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
1632                 hlist_for_each_entry(svc, &ip_vs_svc_fwm_table[idx], f_list) {
1633                         if (svc->ipvs == ipvs)
1634                                 ip_vs_zero_service(svc);
1635                 }
1636         }
1637
1638         ip_vs_zero_stats(&ipvs->tot_stats);
1639         return 0;
1640 }
1641
1642 #ifdef CONFIG_SYSCTL
1643
1644 static int zero;
1645 static int three = 3;
1646
1647 static int
1648 proc_do_defense_mode(struct ctl_table *table, int write,
1649                      void __user *buffer, size_t *lenp, loff_t *ppos)
1650 {
1651         struct netns_ipvs *ipvs = table->extra2;
1652         int *valp = table->data;
1653         int val = *valp;
1654         int rc;
1655
1656         rc = proc_dointvec(table, write, buffer, lenp, ppos);
1657         if (write && (*valp != val)) {
1658                 if ((*valp < 0) || (*valp > 3)) {
1659                         /* Restore the correct value */
1660                         *valp = val;
1661                 } else {
1662                         update_defense_level(ipvs);
1663                 }
1664         }
1665         return rc;
1666 }
1667
1668 static int
1669 proc_do_sync_threshold(struct ctl_table *table, int write,
1670                        void __user *buffer, size_t *lenp, loff_t *ppos)
1671 {
1672         int *valp = table->data;
1673         int val[2];
1674         int rc;
1675
1676         /* backup the value first */
1677         memcpy(val, valp, sizeof(val));
1678
1679         rc = proc_dointvec(table, write, buffer, lenp, ppos);
1680         if (write && (valp[0] < 0 || valp[1] < 0 ||
1681             (valp[0] >= valp[1] && valp[1]))) {
1682                 /* Restore the correct value */
1683                 memcpy(valp, val, sizeof(val));
1684         }
1685         return rc;
1686 }
1687
1688 static int
1689 proc_do_sync_mode(struct ctl_table *table, int write,
1690                      void __user *buffer, size_t *lenp, loff_t *ppos)
1691 {
1692         int *valp = table->data;
1693         int val = *valp;
1694         int rc;
1695
1696         rc = proc_dointvec(table, write, buffer, lenp, ppos);
1697         if (write && (*valp != val)) {
1698                 if ((*valp < 0) || (*valp > 1)) {
1699                         /* Restore the correct value */
1700                         *valp = val;
1701                 }
1702         }
1703         return rc;
1704 }
1705
1706 static int
1707 proc_do_sync_ports(struct ctl_table *table, int write,
1708                    void __user *buffer, size_t *lenp, loff_t *ppos)
1709 {
1710         int *valp = table->data;
1711         int val = *valp;
1712         int rc;
1713
1714         rc = proc_dointvec(table, write, buffer, lenp, ppos);
1715         if (write && (*valp != val)) {
1716                 if (*valp < 1 || !is_power_of_2(*valp)) {
1717                         /* Restore the correct value */
1718                         *valp = val;
1719                 }
1720         }
1721         return rc;
1722 }
1723
1724 /*
1725  *      IPVS sysctl table (under the /proc/sys/net/ipv4/vs/)
1726  *      Do not change order or insert new entries without
1727  *      align with netns init in ip_vs_control_net_init()
1728  */
1729
1730 static struct ctl_table vs_vars[] = {
1731         {
1732                 .procname       = "amemthresh",
1733                 .maxlen         = sizeof(int),
1734                 .mode           = 0644,
1735                 .proc_handler   = proc_dointvec,
1736         },
1737         {
1738                 .procname       = "am_droprate",
1739                 .maxlen         = sizeof(int),
1740                 .mode           = 0644,
1741                 .proc_handler   = proc_dointvec,
1742         },
1743         {
1744                 .procname       = "drop_entry",
1745                 .maxlen         = sizeof(int),
1746                 .mode           = 0644,
1747                 .proc_handler   = proc_do_defense_mode,
1748         },
1749         {
1750                 .procname       = "drop_packet",
1751                 .maxlen         = sizeof(int),
1752                 .mode           = 0644,
1753                 .proc_handler   = proc_do_defense_mode,
1754         },
1755 #ifdef CONFIG_IP_VS_NFCT
1756         {
1757                 .procname       = "conntrack",
1758                 .maxlen         = sizeof(int),
1759                 .mode           = 0644,
1760                 .proc_handler   = &proc_dointvec,
1761         },
1762 #endif
1763         {
1764                 .procname       = "secure_tcp",
1765                 .maxlen         = sizeof(int),
1766                 .mode           = 0644,
1767                 .proc_handler   = proc_do_defense_mode,
1768         },
1769         {
1770                 .procname       = "snat_reroute",
1771                 .maxlen         = sizeof(int),
1772                 .mode           = 0644,
1773                 .proc_handler   = &proc_dointvec,
1774         },
1775         {
1776                 .procname       = "sync_version",
1777                 .maxlen         = sizeof(int),
1778                 .mode           = 0644,
1779                 .proc_handler   = &proc_do_sync_mode,
1780         },
1781         {
1782                 .procname       = "sync_ports",
1783                 .maxlen         = sizeof(int),
1784                 .mode           = 0644,
1785                 .proc_handler   = &proc_do_sync_ports,
1786         },
1787         {
1788                 .procname       = "sync_persist_mode",
1789                 .maxlen         = sizeof(int),
1790                 .mode           = 0644,
1791                 .proc_handler   = proc_dointvec,
1792         },
1793         {
1794                 .procname       = "sync_qlen_max",
1795                 .maxlen         = sizeof(unsigned long),
1796                 .mode           = 0644,
1797                 .proc_handler   = proc_doulongvec_minmax,
1798         },
1799         {
1800                 .procname       = "sync_sock_size",
1801                 .maxlen         = sizeof(int),
1802                 .mode           = 0644,
1803                 .proc_handler   = proc_dointvec,
1804         },
1805         {
1806                 .procname       = "cache_bypass",
1807                 .maxlen         = sizeof(int),
1808                 .mode           = 0644,
1809                 .proc_handler   = proc_dointvec,
1810         },
1811         {
1812                 .procname       = "expire_nodest_conn",
1813                 .maxlen         = sizeof(int),
1814                 .mode           = 0644,
1815                 .proc_handler   = proc_dointvec,
1816         },
1817         {
1818                 .procname       = "sloppy_tcp",
1819                 .maxlen         = sizeof(int),
1820                 .mode           = 0644,
1821                 .proc_handler   = proc_dointvec,
1822         },
1823         {
1824                 .procname       = "sloppy_sctp",
1825                 .maxlen         = sizeof(int),
1826                 .mode           = 0644,
1827                 .proc_handler   = proc_dointvec,
1828         },
1829         {
1830                 .procname       = "expire_quiescent_template",
1831                 .maxlen         = sizeof(int),
1832                 .mode           = 0644,
1833                 .proc_handler   = proc_dointvec,
1834         },
1835         {
1836                 .procname       = "sync_threshold",
1837                 .maxlen         =
1838                         sizeof(((struct netns_ipvs *)0)->sysctl_sync_threshold),
1839                 .mode           = 0644,
1840                 .proc_handler   = proc_do_sync_threshold,
1841         },
1842         {
1843                 .procname       = "sync_refresh_period",
1844                 .maxlen         = sizeof(int),
1845                 .mode           = 0644,
1846                 .proc_handler   = proc_dointvec_jiffies,
1847         },
1848         {
1849                 .procname       = "sync_retries",
1850                 .maxlen         = sizeof(int),
1851                 .mode           = 0644,
1852                 .proc_handler   = proc_dointvec_minmax,
1853                 .extra1         = &zero,
1854                 .extra2         = &three,
1855         },
1856         {
1857                 .procname       = "nat_icmp_send",
1858                 .maxlen         = sizeof(int),
1859                 .mode           = 0644,
1860                 .proc_handler   = proc_dointvec,
1861         },
1862         {
1863                 .procname       = "pmtu_disc",
1864                 .maxlen         = sizeof(int),
1865                 .mode           = 0644,
1866                 .proc_handler   = proc_dointvec,
1867         },
1868         {
1869                 .procname       = "backup_only",
1870                 .maxlen         = sizeof(int),
1871                 .mode           = 0644,
1872                 .proc_handler   = proc_dointvec,
1873         },
1874         {
1875                 .procname       = "conn_reuse_mode",
1876                 .maxlen         = sizeof(int),
1877                 .mode           = 0644,
1878                 .proc_handler   = proc_dointvec,
1879         },
1880         {
1881                 .procname       = "schedule_icmp",
1882                 .maxlen         = sizeof(int),
1883                 .mode           = 0644,
1884                 .proc_handler   = proc_dointvec,
1885         },
1886         {
1887                 .procname       = "ignore_tunneled",
1888                 .maxlen         = sizeof(int),
1889                 .mode           = 0644,
1890                 .proc_handler   = proc_dointvec,
1891         },
1892 #ifdef CONFIG_IP_VS_DEBUG
1893         {
1894                 .procname       = "debug_level",
1895                 .data           = &sysctl_ip_vs_debug_level,
1896                 .maxlen         = sizeof(int),
1897                 .mode           = 0644,
1898                 .proc_handler   = proc_dointvec,
1899         },
1900 #endif
1901         { }
1902 };
1903
1904 #endif
1905
1906 #ifdef CONFIG_PROC_FS
1907
1908 struct ip_vs_iter {
1909         struct seq_net_private p;  /* Do not move this, netns depends upon it*/
1910         struct hlist_head *table;
1911         int bucket;
1912 };
1913
1914 /*
1915  *      Write the contents of the VS rule table to a PROCfs file.
1916  *      (It is kept just for backward compatibility)
1917  */
1918 static inline const char *ip_vs_fwd_name(unsigned int flags)
1919 {
1920         switch (flags & IP_VS_CONN_F_FWD_MASK) {
1921         case IP_VS_CONN_F_LOCALNODE:
1922                 return "Local";
1923         case IP_VS_CONN_F_TUNNEL:
1924                 return "Tunnel";
1925         case IP_VS_CONN_F_DROUTE:
1926                 return "Route";
1927         default:
1928                 return "Masq";
1929         }
1930 }
1931
1932
1933 /* Get the Nth entry in the two lists */
1934 static struct ip_vs_service *ip_vs_info_array(struct seq_file *seq, loff_t pos)
1935 {
1936         struct net *net = seq_file_net(seq);
1937         struct netns_ipvs *ipvs = net_ipvs(net);
1938         struct ip_vs_iter *iter = seq->private;
1939         int idx;
1940         struct ip_vs_service *svc;
1941
1942         /* look in hash by protocol */
1943         for (idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
1944                 hlist_for_each_entry_rcu(svc, &ip_vs_svc_table[idx], s_list) {
1945                         if ((svc->ipvs == ipvs) && pos-- == 0) {
1946                                 iter->table = ip_vs_svc_table;
1947                                 iter->bucket = idx;
1948                                 return svc;
1949                         }
1950                 }
1951         }
1952
1953         /* keep looking in fwmark */
1954         for (idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
1955                 hlist_for_each_entry_rcu(svc, &ip_vs_svc_fwm_table[idx],
1956                                          f_list) {
1957                         if ((svc->ipvs == ipvs) && pos-- == 0) {
1958                                 iter->table = ip_vs_svc_fwm_table;
1959                                 iter->bucket = idx;
1960                                 return svc;
1961                         }
1962                 }
1963         }
1964
1965         return NULL;
1966 }
1967
1968 static void *ip_vs_info_seq_start(struct seq_file *seq, loff_t *pos)
1969         __acquires(RCU)
1970 {
1971         rcu_read_lock();
1972         return *pos ? ip_vs_info_array(seq, *pos - 1) : SEQ_START_TOKEN;
1973 }
1974
1975
1976 static void *ip_vs_info_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1977 {
1978         struct hlist_node *e;
1979         struct ip_vs_iter *iter;
1980         struct ip_vs_service *svc;
1981
1982         ++*pos;
1983         if (v == SEQ_START_TOKEN)
1984                 return ip_vs_info_array(seq,0);
1985
1986         svc = v;
1987         iter = seq->private;
1988
1989         if (iter->table == ip_vs_svc_table) {
1990                 /* next service in table hashed by protocol */
1991                 e = rcu_dereference(hlist_next_rcu(&svc->s_list));
1992                 if (e)
1993                         return hlist_entry(e, struct ip_vs_service, s_list);
1994
1995                 while (++iter->bucket < IP_VS_SVC_TAB_SIZE) {
1996                         hlist_for_each_entry_rcu(svc,
1997                                                  &ip_vs_svc_table[iter->bucket],
1998                                                  s_list) {
1999                                 return svc;
2000                         }
2001                 }
2002
2003                 iter->table = ip_vs_svc_fwm_table;
2004                 iter->bucket = -1;
2005                 goto scan_fwmark;
2006         }
2007
2008         /* next service in hashed by fwmark */
2009         e = rcu_dereference(hlist_next_rcu(&svc->f_list));
2010         if (e)
2011                 return hlist_entry(e, struct ip_vs_service, f_list);
2012
2013  scan_fwmark:
2014         while (++iter->bucket < IP_VS_SVC_TAB_SIZE) {
2015                 hlist_for_each_entry_rcu(svc,
2016                                          &ip_vs_svc_fwm_table[iter->bucket],
2017                                          f_list)
2018                         return svc;
2019         }
2020
2021         return NULL;
2022 }
2023
2024 static void ip_vs_info_seq_stop(struct seq_file *seq, void *v)
2025         __releases(RCU)
2026 {
2027         rcu_read_unlock();
2028 }
2029
2030
2031 static int ip_vs_info_seq_show(struct seq_file *seq, void *v)
2032 {
2033         if (v == SEQ_START_TOKEN) {
2034                 seq_printf(seq,
2035                         "IP Virtual Server version %d.%d.%d (size=%d)\n",
2036                         NVERSION(IP_VS_VERSION_CODE), ip_vs_conn_tab_size);
2037                 seq_puts(seq,
2038                          "Prot LocalAddress:Port Scheduler Flags\n");
2039                 seq_puts(seq,
2040                          "  -> RemoteAddress:Port Forward Weight ActiveConn InActConn\n");
2041         } else {
2042                 struct net *net = seq_file_net(seq);
2043                 struct netns_ipvs *ipvs = net_ipvs(net);
2044                 const struct ip_vs_service *svc = v;
2045                 const struct ip_vs_iter *iter = seq->private;
2046                 const struct ip_vs_dest *dest;
2047                 struct ip_vs_scheduler *sched = rcu_dereference(svc->scheduler);
2048                 char *sched_name = sched ? sched->name : "none";
2049
2050                 if (svc->ipvs != ipvs)
2051                         return 0;
2052                 if (iter->table == ip_vs_svc_table) {
2053 #ifdef CONFIG_IP_VS_IPV6
2054                         if (svc->af == AF_INET6)
2055                                 seq_printf(seq, "%s  [%pI6]:%04X %s ",
2056                                            ip_vs_proto_name(svc->protocol),
2057                                            &svc->addr.in6,
2058                                            ntohs(svc->port),
2059                                            sched_name);
2060                         else
2061 #endif
2062                                 seq_printf(seq, "%s  %08X:%04X %s %s ",
2063                                            ip_vs_proto_name(svc->protocol),
2064                                            ntohl(svc->addr.ip),
2065                                            ntohs(svc->port),
2066                                            sched_name,
2067                                            (svc->flags & IP_VS_SVC_F_ONEPACKET)?"ops ":"");
2068                 } else {
2069                         seq_printf(seq, "FWM  %08X %s %s",
2070                                    svc->fwmark, sched_name,
2071                                    (svc->flags & IP_VS_SVC_F_ONEPACKET)?"ops ":"");
2072                 }
2073
2074                 if (svc->flags & IP_VS_SVC_F_PERSISTENT)
2075                         seq_printf(seq, "persistent %d %08X\n",
2076                                 svc->timeout,
2077                                 ntohl(svc->netmask));
2078                 else
2079                         seq_putc(seq, '\n');
2080
2081                 list_for_each_entry_rcu(dest, &svc->destinations, n_list) {
2082 #ifdef CONFIG_IP_VS_IPV6
2083                         if (dest->af == AF_INET6)
2084                                 seq_printf(seq,
2085                                            "  -> [%pI6]:%04X"
2086                                            "      %-7s %-6d %-10d %-10d\n",
2087                                            &dest->addr.in6,
2088                                            ntohs(dest->port),
2089                                            ip_vs_fwd_name(atomic_read(&dest->conn_flags)),
2090                                            atomic_read(&dest->weight),
2091                                            atomic_read(&dest->activeconns),
2092                                            atomic_read(&dest->inactconns));
2093                         else
2094 #endif
2095                                 seq_printf(seq,
2096                                            "  -> %08X:%04X      "
2097                                            "%-7s %-6d %-10d %-10d\n",
2098                                            ntohl(dest->addr.ip),
2099                                            ntohs(dest->port),
2100                                            ip_vs_fwd_name(atomic_read(&dest->conn_flags)),
2101                                            atomic_read(&dest->weight),
2102                                            atomic_read(&dest->activeconns),
2103                                            atomic_read(&dest->inactconns));
2104
2105                 }
2106         }
2107         return 0;
2108 }
2109
2110 static const struct seq_operations ip_vs_info_seq_ops = {
2111         .start = ip_vs_info_seq_start,
2112         .next  = ip_vs_info_seq_next,
2113         .stop  = ip_vs_info_seq_stop,
2114         .show  = ip_vs_info_seq_show,
2115 };
2116
2117 static int ip_vs_info_open(struct inode *inode, struct file *file)
2118 {
2119         return seq_open_net(inode, file, &ip_vs_info_seq_ops,
2120                         sizeof(struct ip_vs_iter));
2121 }
2122
2123 static const struct file_operations ip_vs_info_fops = {
2124         .owner   = THIS_MODULE,
2125         .open    = ip_vs_info_open,
2126         .read    = seq_read,
2127         .llseek  = seq_lseek,
2128         .release = seq_release_net,
2129 };
2130
2131 static int ip_vs_stats_show(struct seq_file *seq, void *v)
2132 {
2133         struct net *net = seq_file_single_net(seq);
2134         struct ip_vs_kstats show;
2135
2136 /*               01234567 01234567 01234567 0123456701234567 0123456701234567 */
2137         seq_puts(seq,
2138                  "   Total Incoming Outgoing         Incoming         Outgoing\n");
2139         seq_printf(seq,
2140                    "   Conns  Packets  Packets            Bytes            Bytes\n");
2141
2142         ip_vs_copy_stats(&show, &net_ipvs(net)->tot_stats);
2143         seq_printf(seq, "%8LX %8LX %8LX %16LX %16LX\n\n",
2144                    (unsigned long long)show.conns,
2145                    (unsigned long long)show.inpkts,
2146                    (unsigned long long)show.outpkts,
2147                    (unsigned long long)show.inbytes,
2148                    (unsigned long long)show.outbytes);
2149
2150 /*                01234567 01234567 01234567 0123456701234567 0123456701234567*/
2151         seq_puts(seq,
2152                  " Conns/s   Pkts/s   Pkts/s          Bytes/s          Bytes/s\n");
2153         seq_printf(seq, "%8LX %8LX %8LX %16LX %16LX\n",
2154                    (unsigned long long)show.cps,
2155                    (unsigned long long)show.inpps,
2156                    (unsigned long long)show.outpps,
2157                    (unsigned long long)show.inbps,
2158                    (unsigned long long)show.outbps);
2159
2160         return 0;
2161 }
2162
2163 static int ip_vs_stats_seq_open(struct inode *inode, struct file *file)
2164 {
2165         return single_open_net(inode, file, ip_vs_stats_show);
2166 }
2167
2168 static const struct file_operations ip_vs_stats_fops = {
2169         .owner = THIS_MODULE,
2170         .open = ip_vs_stats_seq_open,
2171         .read = seq_read,
2172         .llseek = seq_lseek,
2173         .release = single_release_net,
2174 };
2175
2176 static int ip_vs_stats_percpu_show(struct seq_file *seq, void *v)
2177 {
2178         struct net *net = seq_file_single_net(seq);
2179         struct ip_vs_stats *tot_stats = &net_ipvs(net)->tot_stats;
2180         struct ip_vs_cpu_stats __percpu *cpustats = tot_stats->cpustats;
2181         struct ip_vs_kstats kstats;
2182         int i;
2183
2184 /*               01234567 01234567 01234567 0123456701234567 0123456701234567 */
2185         seq_puts(seq,
2186                  "       Total Incoming Outgoing         Incoming         Outgoing\n");
2187         seq_printf(seq,
2188                    "CPU    Conns  Packets  Packets            Bytes            Bytes\n");
2189
2190         for_each_possible_cpu(i) {
2191                 struct ip_vs_cpu_stats *u = per_cpu_ptr(cpustats, i);
2192                 unsigned int start;
2193                 u64 conns, inpkts, outpkts, inbytes, outbytes;
2194
2195                 do {
2196                         start = u64_stats_fetch_begin_irq(&u->syncp);
2197                         conns = u->cnt.conns;
2198                         inpkts = u->cnt.inpkts;
2199                         outpkts = u->cnt.outpkts;
2200                         inbytes = u->cnt.inbytes;
2201                         outbytes = u->cnt.outbytes;
2202                 } while (u64_stats_fetch_retry_irq(&u->syncp, start));
2203
2204                 seq_printf(seq, "%3X %8LX %8LX %8LX %16LX %16LX\n",
2205                            i, (u64)conns, (u64)inpkts,
2206                            (u64)outpkts, (u64)inbytes,
2207                            (u64)outbytes);
2208         }
2209
2210         ip_vs_copy_stats(&kstats, tot_stats);
2211
2212         seq_printf(seq, "  ~ %8LX %8LX %8LX %16LX %16LX\n\n",
2213                    (unsigned long long)kstats.conns,
2214                    (unsigned long long)kstats.inpkts,
2215                    (unsigned long long)kstats.outpkts,
2216                    (unsigned long long)kstats.inbytes,
2217                    (unsigned long long)kstats.outbytes);
2218
2219 /*                ... 01234567 01234567 01234567 0123456701234567 0123456701234567 */
2220         seq_puts(seq,
2221                  "     Conns/s   Pkts/s   Pkts/s          Bytes/s          Bytes/s\n");
2222         seq_printf(seq, "    %8LX %8LX %8LX %16LX %16LX\n",
2223                    kstats.cps,
2224                    kstats.inpps,
2225                    kstats.outpps,
2226                    kstats.inbps,
2227                    kstats.outbps);
2228
2229         return 0;
2230 }
2231
2232 static int ip_vs_stats_percpu_seq_open(struct inode *inode, struct file *file)
2233 {
2234         return single_open_net(inode, file, ip_vs_stats_percpu_show);
2235 }
2236
2237 static const struct file_operations ip_vs_stats_percpu_fops = {
2238         .owner = THIS_MODULE,
2239         .open = ip_vs_stats_percpu_seq_open,
2240         .read = seq_read,
2241         .llseek = seq_lseek,
2242         .release = single_release_net,
2243 };
2244 #endif
2245
2246 /*
2247  *      Set timeout values for tcp tcpfin udp in the timeout_table.
2248  */
2249 static int ip_vs_set_timeout(struct netns_ipvs *ipvs, struct ip_vs_timeout_user *u)
2250 {
2251 #if defined(CONFIG_IP_VS_PROTO_TCP) || defined(CONFIG_IP_VS_PROTO_UDP)
2252         struct ip_vs_proto_data *pd;
2253 #endif
2254
2255         IP_VS_DBG(2, "Setting timeout tcp:%d tcpfin:%d udp:%d\n",
2256                   u->tcp_timeout,
2257                   u->tcp_fin_timeout,
2258                   u->udp_timeout);
2259
2260 #ifdef CONFIG_IP_VS_PROTO_TCP
2261         if (u->tcp_timeout < 0 || u->tcp_timeout > (INT_MAX / HZ) ||
2262             u->tcp_fin_timeout < 0 || u->tcp_fin_timeout > (INT_MAX / HZ)) {
2263                 return -EINVAL;
2264         }
2265 #endif
2266
2267 #ifdef CONFIG_IP_VS_PROTO_UDP
2268         if (u->udp_timeout < 0 || u->udp_timeout > (INT_MAX / HZ))
2269                 return -EINVAL;
2270 #endif
2271
2272 #ifdef CONFIG_IP_VS_PROTO_TCP
2273         if (u->tcp_timeout) {
2274                 pd = ip_vs_proto_data_get(ipvs, IPPROTO_TCP);
2275                 pd->timeout_table[IP_VS_TCP_S_ESTABLISHED]
2276                         = u->tcp_timeout * HZ;
2277         }
2278
2279         if (u->tcp_fin_timeout) {
2280                 pd = ip_vs_proto_data_get(ipvs, IPPROTO_TCP);
2281                 pd->timeout_table[IP_VS_TCP_S_FIN_WAIT]
2282                         = u->tcp_fin_timeout * HZ;
2283         }
2284 #endif
2285
2286 #ifdef CONFIG_IP_VS_PROTO_UDP
2287         if (u->udp_timeout) {
2288                 pd = ip_vs_proto_data_get(ipvs, IPPROTO_UDP);
2289                 pd->timeout_table[IP_VS_UDP_S_NORMAL]
2290                         = u->udp_timeout * HZ;
2291         }
2292 #endif
2293         return 0;
2294 }
2295
2296 #define CMDID(cmd)              (cmd - IP_VS_BASE_CTL)
2297
2298 struct ip_vs_svcdest_user {
2299         struct ip_vs_service_user       s;
2300         struct ip_vs_dest_user          d;
2301 };
2302
2303 static const unsigned char set_arglen[CMDID(IP_VS_SO_SET_MAX) + 1] = {
2304         [CMDID(IP_VS_SO_SET_ADD)]         = sizeof(struct ip_vs_service_user),
2305         [CMDID(IP_VS_SO_SET_EDIT)]        = sizeof(struct ip_vs_service_user),
2306         [CMDID(IP_VS_SO_SET_DEL)]         = sizeof(struct ip_vs_service_user),
2307         [CMDID(IP_VS_SO_SET_ADDDEST)]     = sizeof(struct ip_vs_svcdest_user),
2308         [CMDID(IP_VS_SO_SET_DELDEST)]     = sizeof(struct ip_vs_svcdest_user),
2309         [CMDID(IP_VS_SO_SET_EDITDEST)]    = sizeof(struct ip_vs_svcdest_user),
2310         [CMDID(IP_VS_SO_SET_TIMEOUT)]     = sizeof(struct ip_vs_timeout_user),
2311         [CMDID(IP_VS_SO_SET_STARTDAEMON)] = sizeof(struct ip_vs_daemon_user),
2312         [CMDID(IP_VS_SO_SET_STOPDAEMON)]  = sizeof(struct ip_vs_daemon_user),
2313         [CMDID(IP_VS_SO_SET_ZERO)]        = sizeof(struct ip_vs_service_user),
2314 };
2315
2316 union ip_vs_set_arglen {
2317         struct ip_vs_service_user       field_IP_VS_SO_SET_ADD;
2318         struct ip_vs_service_user       field_IP_VS_SO_SET_EDIT;
2319         struct ip_vs_service_user       field_IP_VS_SO_SET_DEL;
2320         struct ip_vs_svcdest_user       field_IP_VS_SO_SET_ADDDEST;
2321         struct ip_vs_svcdest_user       field_IP_VS_SO_SET_DELDEST;
2322         struct ip_vs_svcdest_user       field_IP_VS_SO_SET_EDITDEST;
2323         struct ip_vs_timeout_user       field_IP_VS_SO_SET_TIMEOUT;
2324         struct ip_vs_daemon_user        field_IP_VS_SO_SET_STARTDAEMON;
2325         struct ip_vs_daemon_user        field_IP_VS_SO_SET_STOPDAEMON;
2326         struct ip_vs_service_user       field_IP_VS_SO_SET_ZERO;
2327 };
2328
2329 #define MAX_SET_ARGLEN  sizeof(union ip_vs_set_arglen)
2330
2331 static void ip_vs_copy_usvc_compat(struct ip_vs_service_user_kern *usvc,
2332                                   struct ip_vs_service_user *usvc_compat)
2333 {
2334         memset(usvc, 0, sizeof(*usvc));
2335
2336         usvc->af                = AF_INET;
2337         usvc->protocol          = usvc_compat->protocol;
2338         usvc->addr.ip           = usvc_compat->addr;
2339         usvc->port              = usvc_compat->port;
2340         usvc->fwmark            = usvc_compat->fwmark;
2341
2342         /* Deep copy of sched_name is not needed here */
2343         usvc->sched_name        = usvc_compat->sched_name;
2344
2345         usvc->flags             = usvc_compat->flags;
2346         usvc->timeout           = usvc_compat->timeout;
2347         usvc->netmask           = usvc_compat->netmask;
2348 }
2349
2350 static void ip_vs_copy_udest_compat(struct ip_vs_dest_user_kern *udest,
2351                                    struct ip_vs_dest_user *udest_compat)
2352 {
2353         memset(udest, 0, sizeof(*udest));
2354
2355         udest->addr.ip          = udest_compat->addr;
2356         udest->port             = udest_compat->port;
2357         udest->conn_flags       = udest_compat->conn_flags;
2358         udest->weight           = udest_compat->weight;
2359         udest->u_threshold      = udest_compat->u_threshold;
2360         udest->l_threshold      = udest_compat->l_threshold;
2361         udest->af               = AF_INET;
2362 }
2363
2364 static int
2365 do_ip_vs_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len)
2366 {
2367         struct net *net = sock_net(sk);
2368         int ret;
2369         unsigned char arg[MAX_SET_ARGLEN];
2370         struct ip_vs_service_user *usvc_compat;
2371         struct ip_vs_service_user_kern usvc;
2372         struct ip_vs_service *svc;
2373         struct ip_vs_dest_user *udest_compat;
2374         struct ip_vs_dest_user_kern udest;
2375         struct netns_ipvs *ipvs = net_ipvs(net);
2376
2377         BUILD_BUG_ON(sizeof(arg) > 255);
2378         if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
2379                 return -EPERM;
2380
2381         if (cmd < IP_VS_BASE_CTL || cmd > IP_VS_SO_SET_MAX)
2382                 return -EINVAL;
2383         if (len != set_arglen[CMDID(cmd)]) {
2384                 IP_VS_DBG(1, "set_ctl: len %u != %u\n",
2385                           len, set_arglen[CMDID(cmd)]);
2386                 return -EINVAL;
2387         }
2388
2389         if (copy_from_user(arg, user, len) != 0)
2390                 return -EFAULT;
2391
2392         /* increase the module use count */
2393         ip_vs_use_count_inc();
2394
2395         /* Handle daemons since they have another lock */
2396         if (cmd == IP_VS_SO_SET_STARTDAEMON ||
2397             cmd == IP_VS_SO_SET_STOPDAEMON) {
2398                 struct ip_vs_daemon_user *dm = (struct ip_vs_daemon_user *)arg;
2399
2400                 if (cmd == IP_VS_SO_SET_STARTDAEMON) {
2401                         struct ipvs_sync_daemon_cfg cfg;
2402
2403                         memset(&cfg, 0, sizeof(cfg));
2404                         ret = -EINVAL;
2405                         if (strscpy(cfg.mcast_ifn, dm->mcast_ifn,
2406                                     sizeof(cfg.mcast_ifn)) <= 0)
2407                                 goto out_dec;
2408                         cfg.syncid = dm->syncid;
2409                         ret = start_sync_thread(ipvs, &cfg, dm->state);
2410                 } else {
2411                         mutex_lock(&ipvs->sync_mutex);
2412                         ret = stop_sync_thread(ipvs, dm->state);
2413                         mutex_unlock(&ipvs->sync_mutex);
2414                 }
2415                 goto out_dec;
2416         }
2417
2418         mutex_lock(&__ip_vs_mutex);
2419         if (cmd == IP_VS_SO_SET_FLUSH) {
2420                 /* Flush the virtual service */
2421                 ret = ip_vs_flush(ipvs, false);
2422                 goto out_unlock;
2423         } else if (cmd == IP_VS_SO_SET_TIMEOUT) {
2424                 /* Set timeout values for (tcp tcpfin udp) */
2425                 ret = ip_vs_set_timeout(ipvs, (struct ip_vs_timeout_user *)arg);
2426                 goto out_unlock;
2427         } else if (!len) {
2428                 /* No more commands with len == 0 below */
2429                 ret = -EINVAL;
2430                 goto out_unlock;
2431         }
2432
2433         usvc_compat = (struct ip_vs_service_user *)arg;
2434         udest_compat = (struct ip_vs_dest_user *)(usvc_compat + 1);
2435
2436         /* We only use the new structs internally, so copy userspace compat
2437          * structs to extended internal versions */
2438         ip_vs_copy_usvc_compat(&usvc, usvc_compat);
2439         ip_vs_copy_udest_compat(&udest, udest_compat);
2440
2441         if (cmd == IP_VS_SO_SET_ZERO) {
2442                 /* if no service address is set, zero counters in all */
2443                 if (!usvc.fwmark && !usvc.addr.ip && !usvc.port) {
2444                         ret = ip_vs_zero_all(ipvs);
2445                         goto out_unlock;
2446                 }
2447         }
2448
2449         if ((cmd == IP_VS_SO_SET_ADD || cmd == IP_VS_SO_SET_EDIT) &&
2450             strnlen(usvc.sched_name, IP_VS_SCHEDNAME_MAXLEN) ==
2451             IP_VS_SCHEDNAME_MAXLEN) {
2452                 ret = -EINVAL;
2453                 goto out_unlock;
2454         }
2455
2456         /* Check for valid protocol: TCP or UDP or SCTP, even for fwmark!=0 */
2457         if (usvc.protocol != IPPROTO_TCP && usvc.protocol != IPPROTO_UDP &&
2458             usvc.protocol != IPPROTO_SCTP) {
2459                 pr_err("set_ctl: invalid protocol: %d %pI4:%d\n",
2460                        usvc.protocol, &usvc.addr.ip,
2461                        ntohs(usvc.port));
2462                 ret = -EFAULT;
2463                 goto out_unlock;
2464         }
2465
2466         /* Lookup the exact service by <protocol, addr, port> or fwmark */
2467         rcu_read_lock();
2468         if (usvc.fwmark == 0)
2469                 svc = __ip_vs_service_find(ipvs, usvc.af, usvc.protocol,
2470                                            &usvc.addr, usvc.port);
2471         else
2472                 svc = __ip_vs_svc_fwm_find(ipvs, usvc.af, usvc.fwmark);
2473         rcu_read_unlock();
2474
2475         if (cmd != IP_VS_SO_SET_ADD
2476             && (svc == NULL || svc->protocol != usvc.protocol)) {
2477                 ret = -ESRCH;
2478                 goto out_unlock;
2479         }
2480
2481         switch (cmd) {
2482         case IP_VS_SO_SET_ADD:
2483                 if (svc != NULL)
2484                         ret = -EEXIST;
2485                 else
2486                         ret = ip_vs_add_service(ipvs, &usvc, &svc);
2487                 break;
2488         case IP_VS_SO_SET_EDIT:
2489                 ret = ip_vs_edit_service(svc, &usvc);
2490                 break;
2491         case IP_VS_SO_SET_DEL:
2492                 ret = ip_vs_del_service(svc);
2493                 if (!ret)
2494                         goto out_unlock;
2495                 break;
2496         case IP_VS_SO_SET_ZERO:
2497                 ret = ip_vs_zero_service(svc);
2498                 break;
2499         case IP_VS_SO_SET_ADDDEST:
2500                 ret = ip_vs_add_dest(svc, &udest);
2501                 break;
2502         case IP_VS_SO_SET_EDITDEST:
2503                 ret = ip_vs_edit_dest(svc, &udest);
2504                 break;
2505         case IP_VS_SO_SET_DELDEST:
2506                 ret = ip_vs_del_dest(svc, &udest);
2507         }
2508
2509   out_unlock:
2510         mutex_unlock(&__ip_vs_mutex);
2511   out_dec:
2512         /* decrease the module use count */
2513         ip_vs_use_count_dec();
2514
2515         return ret;
2516 }
2517
2518
2519 static void
2520 ip_vs_copy_service(struct ip_vs_service_entry *dst, struct ip_vs_service *src)
2521 {
2522         struct ip_vs_scheduler *sched;
2523         struct ip_vs_kstats kstats;
2524         char *sched_name;
2525
2526         sched = rcu_dereference_protected(src->scheduler, 1);
2527         sched_name = sched ? sched->name : "none";
2528         dst->protocol = src->protocol;
2529         dst->addr = src->addr.ip;
2530         dst->port = src->port;
2531         dst->fwmark = src->fwmark;
2532         strlcpy(dst->sched_name, sched_name, sizeof(dst->sched_name));
2533         dst->flags = src->flags;
2534         dst->timeout = src->timeout / HZ;
2535         dst->netmask = src->netmask;
2536         dst->num_dests = src->num_dests;
2537         ip_vs_copy_stats(&kstats, &src->stats);
2538         ip_vs_export_stats_user(&dst->stats, &kstats);
2539 }
2540
2541 static inline int
2542 __ip_vs_get_service_entries(struct netns_ipvs *ipvs,
2543                             const struct ip_vs_get_services *get,
2544                             struct ip_vs_get_services __user *uptr)
2545 {
2546         int idx, count=0;
2547         struct ip_vs_service *svc;
2548         struct ip_vs_service_entry entry;
2549         int ret = 0;
2550
2551         for (idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
2552                 hlist_for_each_entry(svc, &ip_vs_svc_table[idx], s_list) {
2553                         /* Only expose IPv4 entries to old interface */
2554                         if (svc->af != AF_INET || (svc->ipvs != ipvs))
2555                                 continue;
2556
2557                         if (count >= get->num_services)
2558                                 goto out;
2559                         memset(&entry, 0, sizeof(entry));
2560                         ip_vs_copy_service(&entry, svc);
2561                         if (copy_to_user(&uptr->entrytable[count],
2562                                          &entry, sizeof(entry))) {
2563                                 ret = -EFAULT;
2564                                 goto out;
2565                         }
2566                         count++;
2567                 }
2568         }
2569
2570         for (idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
2571                 hlist_for_each_entry(svc, &ip_vs_svc_fwm_table[idx], f_list) {
2572                         /* Only expose IPv4 entries to old interface */
2573                         if (svc->af != AF_INET || (svc->ipvs != ipvs))
2574                                 continue;
2575
2576                         if (count >= get->num_services)
2577                                 goto out;
2578                         memset(&entry, 0, sizeof(entry));
2579                         ip_vs_copy_service(&entry, svc);
2580                         if (copy_to_user(&uptr->entrytable[count],
2581                                          &entry, sizeof(entry))) {
2582                                 ret = -EFAULT;
2583                                 goto out;
2584                         }
2585                         count++;
2586                 }
2587         }
2588 out:
2589         return ret;
2590 }
2591
2592 static inline int
2593 __ip_vs_get_dest_entries(struct netns_ipvs *ipvs, const struct ip_vs_get_dests *get,
2594                          struct ip_vs_get_dests __user *uptr)
2595 {
2596         struct ip_vs_service *svc;
2597         union nf_inet_addr addr = { .ip = get->addr };
2598         int ret = 0;
2599
2600         rcu_read_lock();
2601         if (get->fwmark)
2602                 svc = __ip_vs_svc_fwm_find(ipvs, AF_INET, get->fwmark);
2603         else
2604                 svc = __ip_vs_service_find(ipvs, AF_INET, get->protocol, &addr,
2605                                            get->port);
2606         rcu_read_unlock();
2607
2608         if (svc) {
2609                 int count = 0;
2610                 struct ip_vs_dest *dest;
2611                 struct ip_vs_dest_entry entry;
2612                 struct ip_vs_kstats kstats;
2613
2614                 memset(&entry, 0, sizeof(entry));
2615                 list_for_each_entry(dest, &svc->destinations, n_list) {
2616                         if (count >= get->num_dests)
2617                                 break;
2618
2619                         /* Cannot expose heterogeneous members via sockopt
2620                          * interface
2621                          */
2622                         if (dest->af != svc->af)
2623                                 continue;
2624
2625                         entry.addr = dest->addr.ip;
2626                         entry.port = dest->port;
2627                         entry.conn_flags = atomic_read(&dest->conn_flags);
2628                         entry.weight = atomic_read(&dest->weight);
2629                         entry.u_threshold = dest->u_threshold;
2630                         entry.l_threshold = dest->l_threshold;
2631                         entry.activeconns = atomic_read(&dest->activeconns);
2632                         entry.inactconns = atomic_read(&dest->inactconns);
2633                         entry.persistconns = atomic_read(&dest->persistconns);
2634                         ip_vs_copy_stats(&kstats, &dest->stats);
2635                         ip_vs_export_stats_user(&entry.stats, &kstats);
2636                         if (copy_to_user(&uptr->entrytable[count],
2637                                          &entry, sizeof(entry))) {
2638                                 ret = -EFAULT;
2639                                 break;
2640                         }
2641                         count++;
2642                 }
2643         } else
2644                 ret = -ESRCH;
2645         return ret;
2646 }
2647
2648 static inline void
2649 __ip_vs_get_timeouts(struct netns_ipvs *ipvs, struct ip_vs_timeout_user *u)
2650 {
2651 #if defined(CONFIG_IP_VS_PROTO_TCP) || defined(CONFIG_IP_VS_PROTO_UDP)
2652         struct ip_vs_proto_data *pd;
2653 #endif
2654
2655         memset(u, 0, sizeof (*u));
2656
2657 #ifdef CONFIG_IP_VS_PROTO_TCP
2658         pd = ip_vs_proto_data_get(ipvs, IPPROTO_TCP);
2659         u->tcp_timeout = pd->timeout_table[IP_VS_TCP_S_ESTABLISHED] / HZ;
2660         u->tcp_fin_timeout = pd->timeout_table[IP_VS_TCP_S_FIN_WAIT] / HZ;
2661 #endif
2662 #ifdef CONFIG_IP_VS_PROTO_UDP
2663         pd = ip_vs_proto_data_get(ipvs, IPPROTO_UDP);
2664         u->udp_timeout =
2665                         pd->timeout_table[IP_VS_UDP_S_NORMAL] / HZ;
2666 #endif
2667 }
2668
2669 static const unsigned char get_arglen[CMDID(IP_VS_SO_GET_MAX) + 1] = {
2670         [CMDID(IP_VS_SO_GET_VERSION)]  = 64,
2671         [CMDID(IP_VS_SO_GET_INFO)]     = sizeof(struct ip_vs_getinfo),
2672         [CMDID(IP_VS_SO_GET_SERVICES)] = sizeof(struct ip_vs_get_services),
2673         [CMDID(IP_VS_SO_GET_SERVICE)]  = sizeof(struct ip_vs_service_entry),
2674         [CMDID(IP_VS_SO_GET_DESTS)]    = sizeof(struct ip_vs_get_dests),
2675         [CMDID(IP_VS_SO_GET_TIMEOUT)]  = sizeof(struct ip_vs_timeout_user),
2676         [CMDID(IP_VS_SO_GET_DAEMON)]   = 2 * sizeof(struct ip_vs_daemon_user),
2677 };
2678
2679 union ip_vs_get_arglen {
2680         char                            field_IP_VS_SO_GET_VERSION[64];
2681         struct ip_vs_getinfo            field_IP_VS_SO_GET_INFO;
2682         struct ip_vs_get_services       field_IP_VS_SO_GET_SERVICES;
2683         struct ip_vs_service_entry      field_IP_VS_SO_GET_SERVICE;
2684         struct ip_vs_get_dests          field_IP_VS_SO_GET_DESTS;
2685         struct ip_vs_timeout_user       field_IP_VS_SO_GET_TIMEOUT;
2686         struct ip_vs_daemon_user        field_IP_VS_SO_GET_DAEMON[2];
2687 };
2688
2689 #define MAX_GET_ARGLEN  sizeof(union ip_vs_get_arglen)
2690
2691 static int
2692 do_ip_vs_get_ctl(struct sock *sk, int cmd, void __user *user, int *len)
2693 {
2694         unsigned char arg[MAX_GET_ARGLEN];
2695         int ret = 0;
2696         unsigned int copylen;
2697         struct net *net = sock_net(sk);
2698         struct netns_ipvs *ipvs = net_ipvs(net);
2699
2700         BUG_ON(!net);
2701         BUILD_BUG_ON(sizeof(arg) > 255);
2702         if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
2703                 return -EPERM;
2704
2705         if (cmd < IP_VS_BASE_CTL || cmd > IP_VS_SO_GET_MAX)
2706                 return -EINVAL;
2707
2708         copylen = get_arglen[CMDID(cmd)];
2709         if (*len < (int) copylen) {
2710                 IP_VS_DBG(1, "get_ctl: len %d < %u\n", *len, copylen);
2711                 return -EINVAL;
2712         }
2713
2714         if (copy_from_user(arg, user, copylen) != 0)
2715                 return -EFAULT;
2716         /*
2717          * Handle daemons first since it has its own locking
2718          */
2719         if (cmd == IP_VS_SO_GET_DAEMON) {
2720                 struct ip_vs_daemon_user d[2];
2721
2722                 memset(&d, 0, sizeof(d));
2723                 mutex_lock(&ipvs->sync_mutex);
2724                 if (ipvs->sync_state & IP_VS_STATE_MASTER) {
2725                         d[0].state = IP_VS_STATE_MASTER;
2726                         strlcpy(d[0].mcast_ifn, ipvs->mcfg.mcast_ifn,
2727                                 sizeof(d[0].mcast_ifn));
2728                         d[0].syncid = ipvs->mcfg.syncid;
2729                 }
2730                 if (ipvs->sync_state & IP_VS_STATE_BACKUP) {
2731                         d[1].state = IP_VS_STATE_BACKUP;
2732                         strlcpy(d[1].mcast_ifn, ipvs->bcfg.mcast_ifn,
2733                                 sizeof(d[1].mcast_ifn));
2734                         d[1].syncid = ipvs->bcfg.syncid;
2735                 }
2736                 if (copy_to_user(user, &d, sizeof(d)) != 0)
2737                         ret = -EFAULT;
2738                 mutex_unlock(&ipvs->sync_mutex);
2739                 return ret;
2740         }
2741
2742         mutex_lock(&__ip_vs_mutex);
2743         switch (cmd) {
2744         case IP_VS_SO_GET_VERSION:
2745         {
2746                 char buf[64];
2747
2748                 sprintf(buf, "IP Virtual Server version %d.%d.%d (size=%d)",
2749                         NVERSION(IP_VS_VERSION_CODE), ip_vs_conn_tab_size);
2750                 if (copy_to_user(user, buf, strlen(buf)+1) != 0) {
2751                         ret = -EFAULT;
2752                         goto out;
2753                 }
2754                 *len = strlen(buf)+1;
2755         }
2756         break;
2757
2758         case IP_VS_SO_GET_INFO:
2759         {
2760                 struct ip_vs_getinfo info;
2761                 info.version = IP_VS_VERSION_CODE;
2762                 info.size = ip_vs_conn_tab_size;
2763                 info.num_services = ipvs->num_services;
2764                 if (copy_to_user(user, &info, sizeof(info)) != 0)
2765                         ret = -EFAULT;
2766         }
2767         break;
2768
2769         case IP_VS_SO_GET_SERVICES:
2770         {
2771                 struct ip_vs_get_services *get;
2772                 int size;
2773
2774                 get = (struct ip_vs_get_services *)arg;
2775                 size = sizeof(*get) +
2776                         sizeof(struct ip_vs_service_entry) * get->num_services;
2777                 if (*len != size) {
2778                         pr_err("length: %u != %u\n", *len, size);
2779                         ret = -EINVAL;
2780                         goto out;
2781                 }
2782                 ret = __ip_vs_get_service_entries(ipvs, get, user);
2783         }
2784         break;
2785
2786         case IP_VS_SO_GET_SERVICE:
2787         {
2788                 struct ip_vs_service_entry *entry;
2789                 struct ip_vs_service *svc;
2790                 union nf_inet_addr addr;
2791
2792                 entry = (struct ip_vs_service_entry *)arg;
2793                 addr.ip = entry->addr;
2794                 rcu_read_lock();
2795                 if (entry->fwmark)
2796                         svc = __ip_vs_svc_fwm_find(ipvs, AF_INET, entry->fwmark);
2797                 else
2798                         svc = __ip_vs_service_find(ipvs, AF_INET,
2799                                                    entry->protocol, &addr,
2800                                                    entry->port);
2801                 rcu_read_unlock();
2802                 if (svc) {
2803                         ip_vs_copy_service(entry, svc);
2804                         if (copy_to_user(user, entry, sizeof(*entry)) != 0)
2805                                 ret = -EFAULT;
2806                 } else
2807                         ret = -ESRCH;
2808         }
2809         break;
2810
2811         case IP_VS_SO_GET_DESTS:
2812         {
2813                 struct ip_vs_get_dests *get;
2814                 int size;
2815
2816                 get = (struct ip_vs_get_dests *)arg;
2817                 size = sizeof(*get) +
2818                         sizeof(struct ip_vs_dest_entry) * get->num_dests;
2819                 if (*len != size) {
2820                         pr_err("length: %u != %u\n", *len, size);
2821                         ret = -EINVAL;
2822                         goto out;
2823                 }
2824                 ret = __ip_vs_get_dest_entries(ipvs, get, user);
2825         }
2826         break;
2827
2828         case IP_VS_SO_GET_TIMEOUT:
2829         {
2830                 struct ip_vs_timeout_user t;
2831
2832                 __ip_vs_get_timeouts(ipvs, &t);
2833                 if (copy_to_user(user, &t, sizeof(t)) != 0)
2834                         ret = -EFAULT;
2835         }
2836         break;
2837
2838         default:
2839                 ret = -EINVAL;
2840         }
2841
2842 out:
2843         mutex_unlock(&__ip_vs_mutex);
2844         return ret;
2845 }
2846
2847
2848 static struct nf_sockopt_ops ip_vs_sockopts = {
2849         .pf             = PF_INET,
2850         .set_optmin     = IP_VS_BASE_CTL,
2851         .set_optmax     = IP_VS_SO_SET_MAX+1,
2852         .set            = do_ip_vs_set_ctl,
2853         .get_optmin     = IP_VS_BASE_CTL,
2854         .get_optmax     = IP_VS_SO_GET_MAX+1,
2855         .get            = do_ip_vs_get_ctl,
2856         .owner          = THIS_MODULE,
2857 };
2858
2859 /*
2860  * Generic Netlink interface
2861  */
2862
2863 /* IPVS genetlink family */
2864 static struct genl_family ip_vs_genl_family = {
2865         .id             = GENL_ID_GENERATE,
2866         .hdrsize        = 0,
2867         .name           = IPVS_GENL_NAME,
2868         .version        = IPVS_GENL_VERSION,
2869         .maxattr        = IPVS_CMD_ATTR_MAX,
2870         .netnsok        = true,         /* Make ipvsadm to work on netns */
2871 };
2872
2873 /* Policy used for first-level command attributes */
2874 static const struct nla_policy ip_vs_cmd_policy[IPVS_CMD_ATTR_MAX + 1] = {
2875         [IPVS_CMD_ATTR_SERVICE]         = { .type = NLA_NESTED },
2876         [IPVS_CMD_ATTR_DEST]            = { .type = NLA_NESTED },
2877         [IPVS_CMD_ATTR_DAEMON]          = { .type = NLA_NESTED },
2878         [IPVS_CMD_ATTR_TIMEOUT_TCP]     = { .type = NLA_U32 },
2879         [IPVS_CMD_ATTR_TIMEOUT_TCP_FIN] = { .type = NLA_U32 },
2880         [IPVS_CMD_ATTR_TIMEOUT_UDP]     = { .type = NLA_U32 },
2881 };
2882
2883 /* Policy used for attributes in nested attribute IPVS_CMD_ATTR_DAEMON */
2884 static const struct nla_policy ip_vs_daemon_policy[IPVS_DAEMON_ATTR_MAX + 1] = {
2885         [IPVS_DAEMON_ATTR_STATE]        = { .type = NLA_U32 },
2886         [IPVS_DAEMON_ATTR_MCAST_IFN]    = { .type = NLA_NUL_STRING,
2887                                             .len = IP_VS_IFNAME_MAXLEN - 1 },
2888         [IPVS_DAEMON_ATTR_SYNC_ID]      = { .type = NLA_U32 },
2889         [IPVS_DAEMON_ATTR_SYNC_MAXLEN]  = { .type = NLA_U16 },
2890         [IPVS_DAEMON_ATTR_MCAST_GROUP]  = { .type = NLA_U32 },
2891         [IPVS_DAEMON_ATTR_MCAST_GROUP6] = { .len = sizeof(struct in6_addr) },
2892         [IPVS_DAEMON_ATTR_MCAST_PORT]   = { .type = NLA_U16 },
2893         [IPVS_DAEMON_ATTR_MCAST_TTL]    = { .type = NLA_U8 },
2894 };
2895
2896 /* Policy used for attributes in nested attribute IPVS_CMD_ATTR_SERVICE */
2897 static const struct nla_policy ip_vs_svc_policy[IPVS_SVC_ATTR_MAX + 1] = {
2898         [IPVS_SVC_ATTR_AF]              = { .type = NLA_U16 },
2899         [IPVS_SVC_ATTR_PROTOCOL]        = { .type = NLA_U16 },
2900         [IPVS_SVC_ATTR_ADDR]            = { .type = NLA_BINARY,
2901                                             .len = sizeof(union nf_inet_addr) },
2902         [IPVS_SVC_ATTR_PORT]            = { .type = NLA_U16 },
2903         [IPVS_SVC_ATTR_FWMARK]          = { .type = NLA_U32 },
2904         [IPVS_SVC_ATTR_SCHED_NAME]      = { .type = NLA_NUL_STRING,
2905                                             .len = IP_VS_SCHEDNAME_MAXLEN - 1 },
2906         [IPVS_SVC_ATTR_PE_NAME]         = { .type = NLA_NUL_STRING,
2907                                             .len = IP_VS_PENAME_MAXLEN },
2908         [IPVS_SVC_ATTR_FLAGS]           = { .type = NLA_BINARY,
2909                                             .len = sizeof(struct ip_vs_flags) },
2910         [IPVS_SVC_ATTR_TIMEOUT]         = { .type = NLA_U32 },
2911         [IPVS_SVC_ATTR_NETMASK]         = { .type = NLA_U32 },
2912         [IPVS_SVC_ATTR_STATS]           = { .type = NLA_NESTED },
2913 };
2914
2915 /* Policy used for attributes in nested attribute IPVS_CMD_ATTR_DEST */
2916 static const struct nla_policy ip_vs_dest_policy[IPVS_DEST_ATTR_MAX + 1] = {
2917         [IPVS_DEST_ATTR_ADDR]           = { .type = NLA_BINARY,
2918                                             .len = sizeof(union nf_inet_addr) },
2919         [IPVS_DEST_ATTR_PORT]           = { .type = NLA_U16 },
2920         [IPVS_DEST_ATTR_FWD_METHOD]     = { .type = NLA_U32 },
2921         [IPVS_DEST_ATTR_WEIGHT]         = { .type = NLA_U32 },
2922         [IPVS_DEST_ATTR_U_THRESH]       = { .type = NLA_U32 },
2923         [IPVS_DEST_ATTR_L_THRESH]       = { .type = NLA_U32 },
2924         [IPVS_DEST_ATTR_ACTIVE_CONNS]   = { .type = NLA_U32 },
2925         [IPVS_DEST_ATTR_INACT_CONNS]    = { .type = NLA_U32 },
2926         [IPVS_DEST_ATTR_PERSIST_CONNS]  = { .type = NLA_U32 },
2927         [IPVS_DEST_ATTR_STATS]          = { .type = NLA_NESTED },
2928         [IPVS_DEST_ATTR_ADDR_FAMILY]    = { .type = NLA_U16 },
2929 };
2930
2931 static int ip_vs_genl_fill_stats(struct sk_buff *skb, int container_type,
2932                                  struct ip_vs_kstats *kstats)
2933 {
2934         struct nlattr *nl_stats = nla_nest_start(skb, container_type);
2935
2936         if (!nl_stats)
2937                 return -EMSGSIZE;
2938
2939         if (nla_put_u32(skb, IPVS_STATS_ATTR_CONNS, (u32)kstats->conns) ||
2940             nla_put_u32(skb, IPVS_STATS_ATTR_INPKTS, (u32)kstats->inpkts) ||
2941             nla_put_u32(skb, IPVS_STATS_ATTR_OUTPKTS, (u32)kstats->outpkts) ||
2942             nla_put_u64_64bit(skb, IPVS_STATS_ATTR_INBYTES, kstats->inbytes,
2943                               IPVS_STATS_ATTR_PAD) ||
2944             nla_put_u64_64bit(skb, IPVS_STATS_ATTR_OUTBYTES, kstats->outbytes,
2945                               IPVS_STATS_ATTR_PAD) ||
2946             nla_put_u32(skb, IPVS_STATS_ATTR_CPS, (u32)kstats->cps) ||
2947             nla_put_u32(skb, IPVS_STATS_ATTR_INPPS, (u32)kstats->inpps) ||
2948             nla_put_u32(skb, IPVS_STATS_ATTR_OUTPPS, (u32)kstats->outpps) ||
2949             nla_put_u32(skb, IPVS_STATS_ATTR_INBPS, (u32)kstats->inbps) ||
2950             nla_put_u32(skb, IPVS_STATS_ATTR_OUTBPS, (u32)kstats->outbps))
2951                 goto nla_put_failure;
2952         nla_nest_end(skb, nl_stats);
2953
2954         return 0;
2955
2956 nla_put_failure:
2957         nla_nest_cancel(skb, nl_stats);
2958         return -EMSGSIZE;
2959 }
2960
2961 static int ip_vs_genl_fill_stats64(struct sk_buff *skb, int container_type,
2962                                    struct ip_vs_kstats *kstats)
2963 {
2964         struct nlattr *nl_stats = nla_nest_start(skb, container_type);
2965
2966         if (!nl_stats)
2967                 return -EMSGSIZE;
2968
2969         if (nla_put_u64_64bit(skb, IPVS_STATS_ATTR_CONNS, kstats->conns,
2970                               IPVS_STATS_ATTR_PAD) ||
2971             nla_put_u64_64bit(skb, IPVS_STATS_ATTR_INPKTS, kstats->inpkts,
2972                               IPVS_STATS_ATTR_PAD) ||
2973             nla_put_u64_64bit(skb, IPVS_STATS_ATTR_OUTPKTS, kstats->outpkts,
2974                               IPVS_STATS_ATTR_PAD) ||
2975             nla_put_u64_64bit(skb, IPVS_STATS_ATTR_INBYTES, kstats->inbytes,
2976                               IPVS_STATS_ATTR_PAD) ||
2977             nla_put_u64_64bit(skb, IPVS_STATS_ATTR_OUTBYTES, kstats->outbytes,
2978                               IPVS_STATS_ATTR_PAD) ||
2979             nla_put_u64_64bit(skb, IPVS_STATS_ATTR_CPS, kstats->cps,
2980                               IPVS_STATS_ATTR_PAD) ||
2981             nla_put_u64_64bit(skb, IPVS_STATS_ATTR_INPPS, kstats->inpps,
2982                               IPVS_STATS_ATTR_PAD) ||
2983             nla_put_u64_64bit(skb, IPVS_STATS_ATTR_OUTPPS, kstats->outpps,
2984                               IPVS_STATS_ATTR_PAD) ||
2985             nla_put_u64_64bit(skb, IPVS_STATS_ATTR_INBPS, kstats->inbps,
2986                               IPVS_STATS_ATTR_PAD) ||
2987             nla_put_u64_64bit(skb, IPVS_STATS_ATTR_OUTBPS, kstats->outbps,
2988                               IPVS_STATS_ATTR_PAD))
2989                 goto nla_put_failure;
2990         nla_nest_end(skb, nl_stats);
2991
2992         return 0;
2993
2994 nla_put_failure:
2995         nla_nest_cancel(skb, nl_stats);
2996         return -EMSGSIZE;
2997 }
2998
2999 static int ip_vs_genl_fill_service(struct sk_buff *skb,
3000                                    struct ip_vs_service *svc)
3001 {
3002         struct ip_vs_scheduler *sched;
3003         struct ip_vs_pe *pe;
3004         struct nlattr *nl_service;
3005         struct ip_vs_flags flags = { .flags = svc->flags,
3006                                      .mask = ~0 };
3007         struct ip_vs_kstats kstats;
3008         char *sched_name;
3009
3010         nl_service = nla_nest_start(skb, IPVS_CMD_ATTR_SERVICE);
3011         if (!nl_service)
3012                 return -EMSGSIZE;
3013
3014         if (nla_put_u16(skb, IPVS_SVC_ATTR_AF, svc->af))
3015                 goto nla_put_failure;
3016         if (svc->fwmark) {
3017                 if (nla_put_u32(skb, IPVS_SVC_ATTR_FWMARK, svc->fwmark))
3018                         goto nla_put_failure;
3019         } else {
3020                 if (nla_put_u16(skb, IPVS_SVC_ATTR_PROTOCOL, svc->protocol) ||
3021                     nla_put(skb, IPVS_SVC_ATTR_ADDR, sizeof(svc->addr), &svc->addr) ||
3022                     nla_put_be16(skb, IPVS_SVC_ATTR_PORT, svc->port))
3023                         goto nla_put_failure;
3024         }
3025
3026         sched = rcu_dereference_protected(svc->scheduler, 1);
3027         sched_name = sched ? sched->name : "none";
3028         pe = rcu_dereference_protected(svc->pe, 1);
3029         if (nla_put_string(skb, IPVS_SVC_ATTR_SCHED_NAME, sched_name) ||
3030             (pe && nla_put_string(skb, IPVS_SVC_ATTR_PE_NAME, pe->name)) ||
3031             nla_put(skb, IPVS_SVC_ATTR_FLAGS, sizeof(flags), &flags) ||
3032             nla_put_u32(skb, IPVS_SVC_ATTR_TIMEOUT, svc->timeout / HZ) ||
3033             nla_put_be32(skb, IPVS_SVC_ATTR_NETMASK, svc->netmask))
3034                 goto nla_put_failure;
3035         ip_vs_copy_stats(&kstats, &svc->stats);
3036         if (ip_vs_genl_fill_stats(skb, IPVS_SVC_ATTR_STATS, &kstats))
3037                 goto nla_put_failure;
3038         if (ip_vs_genl_fill_stats64(skb, IPVS_SVC_ATTR_STATS64, &kstats))
3039                 goto nla_put_failure;
3040
3041         nla_nest_end(skb, nl_service);
3042
3043         return 0;
3044
3045 nla_put_failure:
3046         nla_nest_cancel(skb, nl_service);
3047         return -EMSGSIZE;
3048 }
3049
3050 static int ip_vs_genl_dump_service(struct sk_buff *skb,
3051                                    struct ip_vs_service *svc,
3052                                    struct netlink_callback *cb)
3053 {
3054         void *hdr;
3055
3056         hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
3057                           &ip_vs_genl_family, NLM_F_MULTI,
3058                           IPVS_CMD_NEW_SERVICE);
3059         if (!hdr)
3060                 return -EMSGSIZE;
3061
3062         if (ip_vs_genl_fill_service(skb, svc) < 0)
3063                 goto nla_put_failure;
3064
3065         genlmsg_end(skb, hdr);
3066         return 0;
3067
3068 nla_put_failure:
3069         genlmsg_cancel(skb, hdr);
3070         return -EMSGSIZE;
3071 }
3072
3073 static int ip_vs_genl_dump_services(struct sk_buff *skb,
3074                                     struct netlink_callback *cb)
3075 {
3076         int idx = 0, i;
3077         int start = cb->args[0];
3078         struct ip_vs_service *svc;
3079         struct net *net = sock_net(skb->sk);
3080         struct netns_ipvs *ipvs = net_ipvs(net);
3081
3082         mutex_lock(&__ip_vs_mutex);
3083         for (i = 0; i < IP_VS_SVC_TAB_SIZE; i++) {
3084                 hlist_for_each_entry(svc, &ip_vs_svc_table[i], s_list) {
3085                         if (++idx <= start || (svc->ipvs != ipvs))
3086                                 continue;
3087                         if (ip_vs_genl_dump_service(skb, svc, cb) < 0) {
3088                                 idx--;
3089                                 goto nla_put_failure;
3090                         }
3091                 }
3092         }
3093
3094         for (i = 0; i < IP_VS_SVC_TAB_SIZE; i++) {
3095                 hlist_for_each_entry(svc, &ip_vs_svc_fwm_table[i], f_list) {
3096                         if (++idx <= start || (svc->ipvs != ipvs))
3097                                 continue;
3098                         if (ip_vs_genl_dump_service(skb, svc, cb) < 0) {
3099                                 idx--;
3100                                 goto nla_put_failure;
3101                         }
3102                 }
3103         }
3104
3105 nla_put_failure:
3106         mutex_unlock(&__ip_vs_mutex);
3107         cb->args[0] = idx;
3108
3109         return skb->len;
3110 }
3111
3112 static bool ip_vs_is_af_valid(int af)
3113 {
3114         if (af == AF_INET)
3115                 return true;
3116 #ifdef CONFIG_IP_VS_IPV6
3117         if (af == AF_INET6 && ipv6_mod_enabled())
3118                 return true;
3119 #endif
3120         return false;
3121 }
3122
3123 static int ip_vs_genl_parse_service(struct netns_ipvs *ipvs,
3124                                     struct ip_vs_service_user_kern *usvc,
3125                                     struct nlattr *nla, int full_entry,
3126                                     struct ip_vs_service **ret_svc)
3127 {
3128         struct nlattr *attrs[IPVS_SVC_ATTR_MAX + 1];
3129         struct nlattr *nla_af, *nla_port, *nla_fwmark, *nla_protocol, *nla_addr;
3130         struct ip_vs_service *svc;
3131
3132         /* Parse mandatory identifying service fields first */
3133         if (nla == NULL ||
3134             nla_parse_nested(attrs, IPVS_SVC_ATTR_MAX, nla, ip_vs_svc_policy))
3135                 return -EINVAL;
3136
3137         nla_af          = attrs[IPVS_SVC_ATTR_AF];
3138         nla_protocol    = attrs[IPVS_SVC_ATTR_PROTOCOL];
3139         nla_addr        = attrs[IPVS_SVC_ATTR_ADDR];
3140         nla_port        = attrs[IPVS_SVC_ATTR_PORT];
3141         nla_fwmark      = attrs[IPVS_SVC_ATTR_FWMARK];
3142
3143         if (!(nla_af && (nla_fwmark || (nla_port && nla_protocol && nla_addr))))
3144                 return -EINVAL;
3145
3146         memset(usvc, 0, sizeof(*usvc));
3147
3148         usvc->af = nla_get_u16(nla_af);
3149         if (!ip_vs_is_af_valid(usvc->af))
3150                 return -EAFNOSUPPORT;
3151
3152         if (nla_fwmark) {
3153                 usvc->protocol = IPPROTO_TCP;
3154                 usvc->fwmark = nla_get_u32(nla_fwmark);
3155         } else {
3156                 usvc->protocol = nla_get_u16(nla_protocol);
3157                 nla_memcpy(&usvc->addr, nla_addr, sizeof(usvc->addr));
3158                 usvc->port = nla_get_be16(nla_port);
3159                 usvc->fwmark = 0;
3160         }
3161
3162         rcu_read_lock();
3163         if (usvc->fwmark)
3164                 svc = __ip_vs_svc_fwm_find(ipvs, usvc->af, usvc->fwmark);
3165         else
3166                 svc = __ip_vs_service_find(ipvs, usvc->af, usvc->protocol,
3167                                            &usvc->addr, usvc->port);
3168         rcu_read_unlock();
3169         *ret_svc = svc;
3170
3171         /* If a full entry was requested, check for the additional fields */
3172         if (full_entry) {
3173                 struct nlattr *nla_sched, *nla_flags, *nla_pe, *nla_timeout,
3174                               *nla_netmask;
3175                 struct ip_vs_flags flags;
3176
3177                 nla_sched = attrs[IPVS_SVC_ATTR_SCHED_NAME];
3178                 nla_pe = attrs[IPVS_SVC_ATTR_PE_NAME];
3179                 nla_flags = attrs[IPVS_SVC_ATTR_FLAGS];
3180                 nla_timeout = attrs[IPVS_SVC_ATTR_TIMEOUT];
3181                 nla_netmask = attrs[IPVS_SVC_ATTR_NETMASK];
3182
3183                 if (!(nla_sched && nla_flags && nla_timeout && nla_netmask))
3184                         return -EINVAL;
3185
3186                 nla_memcpy(&flags, nla_flags, sizeof(flags));
3187
3188                 /* prefill flags from service if it already exists */
3189                 if (svc)
3190                         usvc->flags = svc->flags;
3191
3192                 /* set new flags from userland */
3193                 usvc->flags = (usvc->flags & ~flags.mask) |
3194                               (flags.flags & flags.mask);
3195                 usvc->sched_name = nla_data(nla_sched);
3196                 usvc->pe_name = nla_pe ? nla_data(nla_pe) : NULL;
3197                 usvc->timeout = nla_get_u32(nla_timeout);
3198                 usvc->netmask = nla_get_be32(nla_netmask);
3199         }
3200
3201         return 0;
3202 }
3203
3204 static struct ip_vs_service *ip_vs_genl_find_service(struct netns_ipvs *ipvs,
3205                                                      struct nlattr *nla)
3206 {
3207         struct ip_vs_service_user_kern usvc;
3208         struct ip_vs_service *svc;
3209         int ret;
3210
3211         ret = ip_vs_genl_parse_service(ipvs, &usvc, nla, 0, &svc);
3212         return ret ? ERR_PTR(ret) : svc;
3213 }
3214
3215 static int ip_vs_genl_fill_dest(struct sk_buff *skb, struct ip_vs_dest *dest)
3216 {
3217         struct nlattr *nl_dest;
3218         struct ip_vs_kstats kstats;
3219
3220         nl_dest = nla_nest_start(skb, IPVS_CMD_ATTR_DEST);
3221         if (!nl_dest)
3222                 return -EMSGSIZE;
3223
3224         if (nla_put(skb, IPVS_DEST_ATTR_ADDR, sizeof(dest->addr), &dest->addr) ||
3225             nla_put_be16(skb, IPVS_DEST_ATTR_PORT, dest->port) ||
3226             nla_put_u32(skb, IPVS_DEST_ATTR_FWD_METHOD,
3227                         (atomic_read(&dest->conn_flags) &
3228                          IP_VS_CONN_F_FWD_MASK)) ||
3229             nla_put_u32(skb, IPVS_DEST_ATTR_WEIGHT,
3230                         atomic_read(&dest->weight)) ||
3231             nla_put_u32(skb, IPVS_DEST_ATTR_U_THRESH, dest->u_threshold) ||
3232             nla_put_u32(skb, IPVS_DEST_ATTR_L_THRESH, dest->l_threshold) ||
3233             nla_put_u32(skb, IPVS_DEST_ATTR_ACTIVE_CONNS,
3234                         atomic_read(&dest->activeconns)) ||
3235             nla_put_u32(skb, IPVS_DEST_ATTR_INACT_CONNS,
3236                         atomic_read(&dest->inactconns)) ||
3237             nla_put_u32(skb, IPVS_DEST_ATTR_PERSIST_CONNS,
3238                         atomic_read(&dest->persistconns)) ||
3239             nla_put_u16(skb, IPVS_DEST_ATTR_ADDR_FAMILY, dest->af))
3240                 goto nla_put_failure;
3241         ip_vs_copy_stats(&kstats, &dest->stats);
3242         if (ip_vs_genl_fill_stats(skb, IPVS_DEST_ATTR_STATS, &kstats))
3243                 goto nla_put_failure;
3244         if (ip_vs_genl_fill_stats64(skb, IPVS_DEST_ATTR_STATS64, &kstats))
3245                 goto nla_put_failure;
3246
3247         nla_nest_end(skb, nl_dest);
3248
3249         return 0;
3250
3251 nla_put_failure:
3252         nla_nest_cancel(skb, nl_dest);
3253         return -EMSGSIZE;
3254 }
3255
3256 static int ip_vs_genl_dump_dest(struct sk_buff *skb, struct ip_vs_dest *dest,
3257                                 struct netlink_callback *cb)
3258 {
3259         void *hdr;
3260
3261         hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
3262                           &ip_vs_genl_family, NLM_F_MULTI,
3263                           IPVS_CMD_NEW_DEST);
3264         if (!hdr)
3265                 return -EMSGSIZE;
3266
3267         if (ip_vs_genl_fill_dest(skb, dest) < 0)
3268                 goto nla_put_failure;
3269
3270         genlmsg_end(skb, hdr);
3271         return 0;
3272
3273 nla_put_failure:
3274         genlmsg_cancel(skb, hdr);
3275         return -EMSGSIZE;
3276 }
3277
3278 static int ip_vs_genl_dump_dests(struct sk_buff *skb,
3279                                  struct netlink_callback *cb)
3280 {
3281         int idx = 0;
3282         int start = cb->args[0];
3283         struct ip_vs_service *svc;
3284         struct ip_vs_dest *dest;
3285         struct nlattr *attrs[IPVS_CMD_ATTR_MAX + 1];
3286         struct net *net = sock_net(skb->sk);
3287         struct netns_ipvs *ipvs = net_ipvs(net);
3288
3289         mutex_lock(&__ip_vs_mutex);
3290
3291         /* Try to find the service for which to dump destinations */
3292         if (nlmsg_parse(cb->nlh, GENL_HDRLEN, attrs,
3293                         IPVS_CMD_ATTR_MAX, ip_vs_cmd_policy))
3294                 goto out_err;
3295
3296
3297         svc = ip_vs_genl_find_service(ipvs, attrs[IPVS_CMD_ATTR_SERVICE]);
3298         if (IS_ERR(svc) || svc == NULL)
3299                 goto out_err;
3300
3301         /* Dump the destinations */
3302         list_for_each_entry(dest, &svc->destinations, n_list) {
3303                 if (++idx <= start)
3304                         continue;
3305                 if (ip_vs_genl_dump_dest(skb, dest, cb) < 0) {
3306                         idx--;
3307                         goto nla_put_failure;
3308                 }
3309         }
3310
3311 nla_put_failure:
3312         cb->args[0] = idx;
3313
3314 out_err:
3315         mutex_unlock(&__ip_vs_mutex);
3316
3317         return skb->len;
3318 }
3319
3320 static int ip_vs_genl_parse_dest(struct ip_vs_dest_user_kern *udest,
3321                                  struct nlattr *nla, int full_entry)
3322 {
3323         struct nlattr *attrs[IPVS_DEST_ATTR_MAX + 1];
3324         struct nlattr *nla_addr, *nla_port;
3325         struct nlattr *nla_addr_family;
3326
3327         /* Parse mandatory identifying destination fields first */
3328         if (nla == NULL ||
3329             nla_parse_nested(attrs, IPVS_DEST_ATTR_MAX, nla, ip_vs_dest_policy))
3330                 return -EINVAL;
3331
3332         nla_addr        = attrs[IPVS_DEST_ATTR_ADDR];
3333         nla_port        = attrs[IPVS_DEST_ATTR_PORT];
3334         nla_addr_family = attrs[IPVS_DEST_ATTR_ADDR_FAMILY];
3335
3336         if (!(nla_addr && nla_port))
3337                 return -EINVAL;
3338
3339         memset(udest, 0, sizeof(*udest));
3340
3341         nla_memcpy(&udest->addr, nla_addr, sizeof(udest->addr));
3342         udest->port = nla_get_be16(nla_port);
3343
3344         if (nla_addr_family)
3345                 udest->af = nla_get_u16(nla_addr_family);
3346         else
3347                 udest->af = 0;
3348
3349         /* If a full entry was requested, check for the additional fields */
3350         if (full_entry) {
3351                 struct nlattr *nla_fwd, *nla_weight, *nla_u_thresh,
3352                               *nla_l_thresh;
3353
3354                 nla_fwd         = attrs[IPVS_DEST_ATTR_FWD_METHOD];
3355                 nla_weight      = attrs[IPVS_DEST_ATTR_WEIGHT];
3356                 nla_u_thresh    = attrs[IPVS_DEST_ATTR_U_THRESH];
3357                 nla_l_thresh    = attrs[IPVS_DEST_ATTR_L_THRESH];
3358
3359                 if (!(nla_fwd && nla_weight && nla_u_thresh && nla_l_thresh))
3360                         return -EINVAL;
3361
3362                 udest->conn_flags = nla_get_u32(nla_fwd)
3363                                     & IP_VS_CONN_F_FWD_MASK;
3364                 udest->weight = nla_get_u32(nla_weight);
3365                 udest->u_threshold = nla_get_u32(nla_u_thresh);
3366                 udest->l_threshold = nla_get_u32(nla_l_thresh);
3367         }
3368
3369         return 0;
3370 }
3371
3372 static int ip_vs_genl_fill_daemon(struct sk_buff *skb, __u32 state,
3373                                   struct ipvs_sync_daemon_cfg *c)
3374 {
3375         struct nlattr *nl_daemon;
3376
3377         nl_daemon = nla_nest_start(skb, IPVS_CMD_ATTR_DAEMON);
3378         if (!nl_daemon)
3379                 return -EMSGSIZE;
3380
3381         if (nla_put_u32(skb, IPVS_DAEMON_ATTR_STATE, state) ||
3382             nla_put_string(skb, IPVS_DAEMON_ATTR_MCAST_IFN, c->mcast_ifn) ||
3383             nla_put_u32(skb, IPVS_DAEMON_ATTR_SYNC_ID, c->syncid) ||
3384             nla_put_u16(skb, IPVS_DAEMON_ATTR_SYNC_MAXLEN, c->sync_maxlen) ||
3385             nla_put_u16(skb, IPVS_DAEMON_ATTR_MCAST_PORT, c->mcast_port) ||
3386             nla_put_u8(skb, IPVS_DAEMON_ATTR_MCAST_TTL, c->mcast_ttl))
3387                 goto nla_put_failure;
3388 #ifdef CONFIG_IP_VS_IPV6
3389         if (c->mcast_af == AF_INET6) {
3390                 if (nla_put_in6_addr(skb, IPVS_DAEMON_ATTR_MCAST_GROUP6,
3391                                      &c->mcast_group.in6))
3392                         goto nla_put_failure;
3393         } else
3394 #endif
3395                 if (c->mcast_af == AF_INET &&
3396                     nla_put_in_addr(skb, IPVS_DAEMON_ATTR_MCAST_GROUP,
3397                                     c->mcast_group.ip))
3398                         goto nla_put_failure;
3399         nla_nest_end(skb, nl_daemon);
3400
3401         return 0;
3402
3403 nla_put_failure:
3404         nla_nest_cancel(skb, nl_daemon);
3405         return -EMSGSIZE;
3406 }
3407
3408 static int ip_vs_genl_dump_daemon(struct sk_buff *skb, __u32 state,
3409                                   struct ipvs_sync_daemon_cfg *c,
3410                                   struct netlink_callback *cb)
3411 {
3412         void *hdr;
3413         hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
3414                           &ip_vs_genl_family, NLM_F_MULTI,
3415                           IPVS_CMD_NEW_DAEMON);
3416         if (!hdr)
3417                 return -EMSGSIZE;
3418
3419         if (ip_vs_genl_fill_daemon(skb, state, c))
3420                 goto nla_put_failure;
3421
3422         genlmsg_end(skb, hdr);
3423         return 0;
3424
3425 nla_put_failure:
3426         genlmsg_cancel(skb, hdr);
3427         return -EMSGSIZE;
3428 }
3429
3430 static int ip_vs_genl_dump_daemons(struct sk_buff *skb,
3431                                    struct netlink_callback *cb)
3432 {
3433         struct net *net = sock_net(skb->sk);
3434         struct netns_ipvs *ipvs = net_ipvs(net);
3435
3436         mutex_lock(&ipvs->sync_mutex);
3437         if ((ipvs->sync_state & IP_VS_STATE_MASTER) && !cb->args[0]) {
3438                 if (ip_vs_genl_dump_daemon(skb, IP_VS_STATE_MASTER,
3439                                            &ipvs->mcfg, cb) < 0)
3440                         goto nla_put_failure;
3441
3442                 cb->args[0] = 1;
3443         }
3444
3445         if ((ipvs->sync_state & IP_VS_STATE_BACKUP) && !cb->args[1]) {
3446                 if (ip_vs_genl_dump_daemon(skb, IP_VS_STATE_BACKUP,
3447                                            &ipvs->bcfg, cb) < 0)
3448                         goto nla_put_failure;
3449
3450                 cb->args[1] = 1;
3451         }
3452
3453 nla_put_failure:
3454         mutex_unlock(&ipvs->sync_mutex);
3455
3456         return skb->len;
3457 }
3458
3459 static int ip_vs_genl_new_daemon(struct netns_ipvs *ipvs, struct nlattr **attrs)
3460 {
3461         struct ipvs_sync_daemon_cfg c;
3462         struct nlattr *a;
3463         int ret;
3464
3465         memset(&c, 0, sizeof(c));
3466         if (!(attrs[IPVS_DAEMON_ATTR_STATE] &&
3467               attrs[IPVS_DAEMON_ATTR_MCAST_IFN] &&
3468               attrs[IPVS_DAEMON_ATTR_SYNC_ID]))
3469                 return -EINVAL;
3470         strlcpy(c.mcast_ifn, nla_data(attrs[IPVS_DAEMON_ATTR_MCAST_IFN]),
3471                 sizeof(c.mcast_ifn));
3472         c.syncid = nla_get_u32(attrs[IPVS_DAEMON_ATTR_SYNC_ID]);
3473
3474         a = attrs[IPVS_DAEMON_ATTR_SYNC_MAXLEN];
3475         if (a)
3476                 c.sync_maxlen = nla_get_u16(a);
3477
3478         a = attrs[IPVS_DAEMON_ATTR_MCAST_GROUP];
3479         if (a) {
3480                 c.mcast_af = AF_INET;
3481                 c.mcast_group.ip = nla_get_in_addr(a);
3482                 if (!ipv4_is_multicast(c.mcast_group.ip))
3483                         return -EINVAL;
3484         } else {
3485                 a = attrs[IPVS_DAEMON_ATTR_MCAST_GROUP6];
3486                 if (a) {
3487 #ifdef CONFIG_IP_VS_IPV6
3488                         int addr_type;
3489
3490                         c.mcast_af = AF_INET6;
3491                         c.mcast_group.in6 = nla_get_in6_addr(a);
3492                         addr_type = ipv6_addr_type(&c.mcast_group.in6);
3493                         if (!(addr_type & IPV6_ADDR_MULTICAST))
3494                                 return -EINVAL;
3495 #else
3496                         return -EAFNOSUPPORT;
3497 #endif
3498                 }
3499         }
3500
3501         a = attrs[IPVS_DAEMON_ATTR_MCAST_PORT];
3502         if (a)
3503                 c.mcast_port = nla_get_u16(a);
3504
3505         a = attrs[IPVS_DAEMON_ATTR_MCAST_TTL];
3506         if (a)
3507                 c.mcast_ttl = nla_get_u8(a);
3508
3509         /* The synchronization protocol is incompatible with mixed family
3510          * services
3511          */
3512         if (ipvs->mixed_address_family_dests > 0)
3513                 return -EINVAL;
3514
3515         ret = start_sync_thread(ipvs, &c,
3516                                 nla_get_u32(attrs[IPVS_DAEMON_ATTR_STATE]));
3517         return ret;
3518 }
3519
3520 static int ip_vs_genl_del_daemon(struct netns_ipvs *ipvs, struct nlattr **attrs)
3521 {
3522         int ret;
3523
3524         if (!attrs[IPVS_DAEMON_ATTR_STATE])
3525                 return -EINVAL;
3526
3527         mutex_lock(&ipvs->sync_mutex);
3528         ret = stop_sync_thread(ipvs,
3529                                nla_get_u32(attrs[IPVS_DAEMON_ATTR_STATE]));
3530         mutex_unlock(&ipvs->sync_mutex);
3531         return ret;
3532 }
3533
3534 static int ip_vs_genl_set_config(struct netns_ipvs *ipvs, struct nlattr **attrs)
3535 {
3536         struct ip_vs_timeout_user t;
3537
3538         __ip_vs_get_timeouts(ipvs, &t);
3539
3540         if (attrs[IPVS_CMD_ATTR_TIMEOUT_TCP])
3541                 t.tcp_timeout = nla_get_u32(attrs[IPVS_CMD_ATTR_TIMEOUT_TCP]);
3542
3543         if (attrs[IPVS_CMD_ATTR_TIMEOUT_TCP_FIN])
3544                 t.tcp_fin_timeout =
3545                         nla_get_u32(attrs[IPVS_CMD_ATTR_TIMEOUT_TCP_FIN]);
3546
3547         if (attrs[IPVS_CMD_ATTR_TIMEOUT_UDP])
3548                 t.udp_timeout = nla_get_u32(attrs[IPVS_CMD_ATTR_TIMEOUT_UDP]);
3549
3550         return ip_vs_set_timeout(ipvs, &t);
3551 }
3552
3553 static int ip_vs_genl_set_daemon(struct sk_buff *skb, struct genl_info *info)
3554 {
3555         int ret = -EINVAL, cmd;
3556         struct net *net = sock_net(skb->sk);
3557         struct netns_ipvs *ipvs = net_ipvs(net);
3558
3559         cmd = info->genlhdr->cmd;
3560
3561         if (cmd == IPVS_CMD_NEW_DAEMON || cmd == IPVS_CMD_DEL_DAEMON) {
3562                 struct nlattr *daemon_attrs[IPVS_DAEMON_ATTR_MAX + 1];
3563
3564                 if (!info->attrs[IPVS_CMD_ATTR_DAEMON] ||
3565                     nla_parse_nested(daemon_attrs, IPVS_DAEMON_ATTR_MAX,
3566                                      info->attrs[IPVS_CMD_ATTR_DAEMON],
3567                                      ip_vs_daemon_policy))
3568                         goto out;
3569
3570                 if (cmd == IPVS_CMD_NEW_DAEMON)
3571                         ret = ip_vs_genl_new_daemon(ipvs, daemon_attrs);
3572                 else
3573                         ret = ip_vs_genl_del_daemon(ipvs, daemon_attrs);
3574         }
3575
3576 out:
3577         return ret;
3578 }
3579
3580 static int ip_vs_genl_set_cmd(struct sk_buff *skb, struct genl_info *info)
3581 {
3582         struct ip_vs_service *svc = NULL;
3583         struct ip_vs_service_user_kern usvc;
3584         struct ip_vs_dest_user_kern udest;
3585         int ret = 0, cmd;
3586         int need_full_svc = 0, need_full_dest = 0;
3587         struct net *net = sock_net(skb->sk);
3588         struct netns_ipvs *ipvs = net_ipvs(net);
3589
3590         cmd = info->genlhdr->cmd;
3591
3592         mutex_lock(&__ip_vs_mutex);
3593
3594         if (cmd == IPVS_CMD_FLUSH) {
3595                 ret = ip_vs_flush(ipvs, false);
3596                 goto out;
3597         } else if (cmd == IPVS_CMD_SET_CONFIG) {
3598                 ret = ip_vs_genl_set_config(ipvs, info->attrs);
3599                 goto out;
3600         } else if (cmd == IPVS_CMD_ZERO &&
3601                    !info->attrs[IPVS_CMD_ATTR_SERVICE]) {
3602                 ret = ip_vs_zero_all(ipvs);
3603                 goto out;
3604         }
3605
3606         /* All following commands require a service argument, so check if we
3607          * received a valid one. We need a full service specification when
3608          * adding / editing a service. Only identifying members otherwise. */
3609         if (cmd == IPVS_CMD_NEW_SERVICE || cmd == IPVS_CMD_SET_SERVICE)
3610                 need_full_svc = 1;
3611
3612         ret = ip_vs_genl_parse_service(ipvs, &usvc,
3613                                        info->attrs[IPVS_CMD_ATTR_SERVICE],
3614                                        need_full_svc, &svc);
3615         if (ret)
3616                 goto out;
3617
3618         /* Unless we're adding a new service, the service must already exist */
3619         if ((cmd != IPVS_CMD_NEW_SERVICE) && (svc == NULL)) {
3620                 ret = -ESRCH;
3621                 goto out;
3622         }
3623
3624         /* Destination commands require a valid destination argument. For
3625          * adding / editing a destination, we need a full destination
3626          * specification. */
3627         if (cmd == IPVS_CMD_NEW_DEST || cmd == IPVS_CMD_SET_DEST ||
3628             cmd == IPVS_CMD_DEL_DEST) {
3629                 if (cmd != IPVS_CMD_DEL_DEST)
3630                         need_full_dest = 1;
3631
3632                 ret = ip_vs_genl_parse_dest(&udest,
3633                                             info->attrs[IPVS_CMD_ATTR_DEST],
3634                                             need_full_dest);
3635                 if (ret)
3636                         goto out;
3637
3638                 /* Old protocols did not allow the user to specify address
3639                  * family, so we set it to zero instead.  We also didn't
3640                  * allow heterogeneous pools in the old code, so it's safe
3641                  * to assume that this will have the same address family as
3642                  * the service.
3643                  */
3644                 if (udest.af == 0)
3645                         udest.af = svc->af;
3646
3647                 if (!ip_vs_is_af_valid(udest.af)) {
3648                         ret = -EAFNOSUPPORT;
3649                         goto out;
3650                 }
3651
3652                 if (udest.af != svc->af && cmd != IPVS_CMD_DEL_DEST) {
3653                         /* The synchronization protocol is incompatible
3654                          * with mixed family services
3655                          */
3656                         if (ipvs->sync_state) {
3657                                 ret = -EINVAL;
3658                                 goto out;
3659                         }
3660
3661                         /* Which connection types do we support? */
3662                         switch (udest.conn_flags) {
3663                         case IP_VS_CONN_F_TUNNEL:
3664                                 /* We are able to forward this */
3665                                 break;
3666                         default:
3667                                 ret = -EINVAL;
3668                                 goto out;
3669                         }
3670                 }
3671         }
3672
3673         switch (cmd) {
3674         case IPVS_CMD_NEW_SERVICE:
3675                 if (svc == NULL)
3676                         ret = ip_vs_add_service(ipvs, &usvc, &svc);
3677                 else
3678                         ret = -EEXIST;
3679                 break;
3680         case IPVS_CMD_SET_SERVICE:
3681                 ret = ip_vs_edit_service(svc, &usvc);
3682                 break;
3683         case IPVS_CMD_DEL_SERVICE:
3684                 ret = ip_vs_del_service(svc);
3685                 /* do not use svc, it can be freed */
3686                 break;
3687         case IPVS_CMD_NEW_DEST:
3688                 ret = ip_vs_add_dest(svc, &udest);
3689                 break;
3690         case IPVS_CMD_SET_DEST:
3691                 ret = ip_vs_edit_dest(svc, &udest);
3692                 break;
3693         case IPVS_CMD_DEL_DEST:
3694                 ret = ip_vs_del_dest(svc, &udest);
3695                 break;
3696         case IPVS_CMD_ZERO:
3697                 ret = ip_vs_zero_service(svc);
3698                 break;
3699         default:
3700                 ret = -EINVAL;
3701         }
3702
3703 out:
3704         mutex_unlock(&__ip_vs_mutex);
3705
3706         return ret;
3707 }
3708
3709 static int ip_vs_genl_get_cmd(struct sk_buff *skb, struct genl_info *info)
3710 {
3711         struct sk_buff *msg;
3712         void *reply;
3713         int ret, cmd, reply_cmd;
3714         struct net *net = sock_net(skb->sk);
3715         struct netns_ipvs *ipvs = net_ipvs(net);
3716
3717         cmd = info->genlhdr->cmd;
3718
3719         if (cmd == IPVS_CMD_GET_SERVICE)
3720                 reply_cmd = IPVS_CMD_NEW_SERVICE;
3721         else if (cmd == IPVS_CMD_GET_INFO)
3722                 reply_cmd = IPVS_CMD_SET_INFO;
3723         else if (cmd == IPVS_CMD_GET_CONFIG)
3724                 reply_cmd = IPVS_CMD_SET_CONFIG;
3725         else {
3726                 pr_err("unknown Generic Netlink command\n");
3727                 return -EINVAL;
3728         }
3729
3730         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
3731         if (!msg)
3732                 return -ENOMEM;
3733
3734         mutex_lock(&__ip_vs_mutex);
3735
3736         reply = genlmsg_put_reply(msg, info, &ip_vs_genl_family, 0, reply_cmd);
3737         if (reply == NULL)
3738                 goto nla_put_failure;
3739
3740         switch (cmd) {
3741         case IPVS_CMD_GET_SERVICE:
3742         {
3743                 struct ip_vs_service *svc;
3744
3745                 svc = ip_vs_genl_find_service(ipvs,
3746                                               info->attrs[IPVS_CMD_ATTR_SERVICE]);
3747                 if (IS_ERR(svc)) {
3748                         ret = PTR_ERR(svc);
3749                         goto out_err;
3750                 } else if (svc) {
3751                         ret = ip_vs_genl_fill_service(msg, svc);
3752                         if (ret)
3753                                 goto nla_put_failure;
3754                 } else {
3755                         ret = -ESRCH;
3756                         goto out_err;
3757                 }
3758
3759                 break;
3760         }
3761
3762         case IPVS_CMD_GET_CONFIG:
3763         {
3764                 struct ip_vs_timeout_user t;
3765
3766                 __ip_vs_get_timeouts(ipvs, &t);
3767 #ifdef CONFIG_IP_VS_PROTO_TCP
3768                 if (nla_put_u32(msg, IPVS_CMD_ATTR_TIMEOUT_TCP,
3769                                 t.tcp_timeout) ||
3770                     nla_put_u32(msg, IPVS_CMD_ATTR_TIMEOUT_TCP_FIN,
3771                                 t.tcp_fin_timeout))
3772                         goto nla_put_failure;
3773 #endif
3774 #ifdef CONFIG_IP_VS_PROTO_UDP
3775                 if (nla_put_u32(msg, IPVS_CMD_ATTR_TIMEOUT_UDP, t.udp_timeout))
3776                         goto nla_put_failure;
3777 #endif
3778
3779                 break;
3780         }
3781
3782         case IPVS_CMD_GET_INFO:
3783                 if (nla_put_u32(msg, IPVS_INFO_ATTR_VERSION,
3784                                 IP_VS_VERSION_CODE) ||
3785                     nla_put_u32(msg, IPVS_INFO_ATTR_CONN_TAB_SIZE,
3786                                 ip_vs_conn_tab_size))
3787                         goto nla_put_failure;
3788                 break;
3789         }
3790
3791         genlmsg_end(msg, reply);
3792         ret = genlmsg_reply(msg, info);
3793         goto out;
3794
3795 nla_put_failure:
3796         pr_err("not enough space in Netlink message\n");
3797         ret = -EMSGSIZE;
3798
3799 out_err:
3800         nlmsg_free(msg);
3801 out:
3802         mutex_unlock(&__ip_vs_mutex);
3803
3804         return ret;
3805 }
3806
3807
3808 static const struct genl_ops ip_vs_genl_ops[] = {
3809         {
3810                 .cmd    = IPVS_CMD_NEW_SERVICE,
3811                 .flags  = GENL_ADMIN_PERM,
3812                 .policy = ip_vs_cmd_policy,
3813                 .doit   = ip_vs_genl_set_cmd,
3814         },
3815         {
3816                 .cmd    = IPVS_CMD_SET_SERVICE,
3817                 .flags  = GENL_ADMIN_PERM,
3818                 .policy = ip_vs_cmd_policy,
3819                 .doit   = ip_vs_genl_set_cmd,
3820         },
3821         {
3822                 .cmd    = IPVS_CMD_DEL_SERVICE,
3823                 .flags  = GENL_ADMIN_PERM,
3824                 .policy = ip_vs_cmd_policy,
3825                 .doit   = ip_vs_genl_set_cmd,
3826         },
3827         {
3828                 .cmd    = IPVS_CMD_GET_SERVICE,
3829                 .flags  = GENL_ADMIN_PERM,
3830                 .doit   = ip_vs_genl_get_cmd,
3831                 .dumpit = ip_vs_genl_dump_services,
3832                 .policy = ip_vs_cmd_policy,
3833         },
3834         {
3835                 .cmd    = IPVS_CMD_NEW_DEST,
3836                 .flags  = GENL_ADMIN_PERM,
3837                 .policy = ip_vs_cmd_policy,
3838                 .doit   = ip_vs_genl_set_cmd,
3839         },
3840         {
3841                 .cmd    = IPVS_CMD_SET_DEST,
3842                 .flags  = GENL_ADMIN_PERM,
3843                 .policy = ip_vs_cmd_policy,
3844                 .doit   = ip_vs_genl_set_cmd,
3845         },
3846         {
3847                 .cmd    = IPVS_CMD_DEL_DEST,
3848                 .flags  = GENL_ADMIN_PERM,
3849                 .policy = ip_vs_cmd_policy,
3850                 .doit   = ip_vs_genl_set_cmd,
3851         },
3852         {
3853                 .cmd    = IPVS_CMD_GET_DEST,
3854                 .flags  = GENL_ADMIN_PERM,
3855                 .policy = ip_vs_cmd_policy,
3856                 .dumpit = ip_vs_genl_dump_dests,
3857         },
3858         {
3859                 .cmd    = IPVS_CMD_NEW_DAEMON,
3860                 .flags  = GENL_ADMIN_PERM,
3861                 .policy = ip_vs_cmd_policy,
3862                 .doit   = ip_vs_genl_set_daemon,
3863         },
3864         {
3865                 .cmd    = IPVS_CMD_DEL_DAEMON,
3866                 .flags  = GENL_ADMIN_PERM,
3867                 .policy = ip_vs_cmd_policy,
3868                 .doit   = ip_vs_genl_set_daemon,
3869         },
3870         {
3871                 .cmd    = IPVS_CMD_GET_DAEMON,
3872                 .flags  = GENL_ADMIN_PERM,
3873                 .dumpit = ip_vs_genl_dump_daemons,
3874         },
3875         {
3876                 .cmd    = IPVS_CMD_SET_CONFIG,
3877                 .flags  = GENL_ADMIN_PERM,
3878                 .policy = ip_vs_cmd_policy,
3879                 .doit   = ip_vs_genl_set_cmd,
3880         },
3881         {
3882                 .cmd    = IPVS_CMD_GET_CONFIG,
3883                 .flags  = GENL_ADMIN_PERM,
3884                 .doit   = ip_vs_genl_get_cmd,
3885         },
3886         {
3887                 .cmd    = IPVS_CMD_GET_INFO,
3888                 .flags  = GENL_ADMIN_PERM,
3889                 .doit   = ip_vs_genl_get_cmd,
3890         },
3891         {
3892                 .cmd    = IPVS_CMD_ZERO,
3893                 .flags  = GENL_ADMIN_PERM,
3894                 .policy = ip_vs_cmd_policy,
3895                 .doit   = ip_vs_genl_set_cmd,
3896         },
3897         {
3898                 .cmd    = IPVS_CMD_FLUSH,
3899                 .flags  = GENL_ADMIN_PERM,
3900                 .doit   = ip_vs_genl_set_cmd,
3901         },
3902 };
3903
3904 static int __init ip_vs_genl_register(void)
3905 {
3906         return genl_register_family_with_ops(&ip_vs_genl_family,
3907                                              ip_vs_genl_ops);
3908 }
3909
3910 static void ip_vs_genl_unregister(void)
3911 {
3912         genl_unregister_family(&ip_vs_genl_family);
3913 }
3914
3915 /* End of Generic Netlink interface definitions */
3916
3917 /*
3918  * per netns intit/exit func.
3919  */
3920 #ifdef CONFIG_SYSCTL
3921 static int __net_init ip_vs_control_net_init_sysctl(struct netns_ipvs *ipvs)
3922 {
3923         struct net *net = ipvs->net;
3924         int idx;
3925         struct ctl_table *tbl;
3926
3927         atomic_set(&ipvs->dropentry, 0);
3928         spin_lock_init(&ipvs->dropentry_lock);
3929         spin_lock_init(&ipvs->droppacket_lock);
3930         spin_lock_init(&ipvs->securetcp_lock);
3931
3932         if (!net_eq(net, &init_net)) {
3933                 tbl = kmemdup(vs_vars, sizeof(vs_vars), GFP_KERNEL);
3934                 if (tbl == NULL)
3935                         return -ENOMEM;
3936
3937                 /* Don't export sysctls to unprivileged users */
3938                 if (net->user_ns != &init_user_ns)
3939                         tbl[0].procname = NULL;
3940         } else
3941                 tbl = vs_vars;
3942         /* Initialize sysctl defaults */
3943         for (idx = 0; idx < ARRAY_SIZE(vs_vars); idx++) {
3944                 if (tbl[idx].proc_handler == proc_do_defense_mode)
3945                         tbl[idx].extra2 = ipvs;
3946         }
3947         idx = 0;
3948         ipvs->sysctl_amemthresh = 1024;
3949         tbl[idx++].data = &ipvs->sysctl_amemthresh;
3950         ipvs->sysctl_am_droprate = 10;
3951         tbl[idx++].data = &ipvs->sysctl_am_droprate;
3952         tbl[idx++].data = &ipvs->sysctl_drop_entry;
3953         tbl[idx++].data = &ipvs->sysctl_drop_packet;
3954 #ifdef CONFIG_IP_VS_NFCT
3955         tbl[idx++].data = &ipvs->sysctl_conntrack;
3956 #endif
3957         tbl[idx++].data = &ipvs->sysctl_secure_tcp;
3958         ipvs->sysctl_snat_reroute = 1;
3959         tbl[idx++].data = &ipvs->sysctl_snat_reroute;
3960         ipvs->sysctl_sync_ver = 1;
3961         tbl[idx++].data = &ipvs->sysctl_sync_ver;
3962         ipvs->sysctl_sync_ports = 1;
3963         tbl[idx++].data = &ipvs->sysctl_sync_ports;
3964         tbl[idx++].data = &ipvs->sysctl_sync_persist_mode;
3965         ipvs->sysctl_sync_qlen_max = nr_free_buffer_pages() / 32;
3966         tbl[idx++].data = &ipvs->sysctl_sync_qlen_max;
3967         ipvs->sysctl_sync_sock_size = 0;
3968         tbl[idx++].data = &ipvs->sysctl_sync_sock_size;
3969         tbl[idx++].data = &ipvs->sysctl_cache_bypass;
3970         tbl[idx++].data = &ipvs->sysctl_expire_nodest_conn;
3971         tbl[idx++].data = &ipvs->sysctl_sloppy_tcp;
3972         tbl[idx++].data = &ipvs->sysctl_sloppy_sctp;
3973         tbl[idx++].data = &ipvs->sysctl_expire_quiescent_template;
3974         ipvs->sysctl_sync_threshold[0] = DEFAULT_SYNC_THRESHOLD;
3975         ipvs->sysctl_sync_threshold[1] = DEFAULT_SYNC_PERIOD;
3976         tbl[idx].data = &ipvs->sysctl_sync_threshold;
3977         tbl[idx++].maxlen = sizeof(ipvs->sysctl_sync_threshold);
3978         ipvs->sysctl_sync_refresh_period = DEFAULT_SYNC_REFRESH_PERIOD;
3979         tbl[idx++].data = &ipvs->sysctl_sync_refresh_period;
3980         ipvs->sysctl_sync_retries = clamp_t(int, DEFAULT_SYNC_RETRIES, 0, 3);
3981         tbl[idx++].data = &ipvs->sysctl_sync_retries;
3982         tbl[idx++].data = &ipvs->sysctl_nat_icmp_send;
3983         ipvs->sysctl_pmtu_disc = 1;
3984         tbl[idx++].data = &ipvs->sysctl_pmtu_disc;
3985         tbl[idx++].data = &ipvs->sysctl_backup_only;
3986         ipvs->sysctl_conn_reuse_mode = 1;
3987         tbl[idx++].data = &ipvs->sysctl_conn_reuse_mode;
3988         tbl[idx++].data = &ipvs->sysctl_schedule_icmp;
3989         tbl[idx++].data = &ipvs->sysctl_ignore_tunneled;
3990 #ifdef CONFIG_IP_VS_DEBUG
3991         /* Global sysctls must be ro in non-init netns */
3992         if (!net_eq(net, &init_net))
3993                 tbl[idx++].mode = 0444;
3994 #endif
3995
3996         ipvs->sysctl_hdr = register_net_sysctl(net, "net/ipv4/vs", tbl);
3997         if (ipvs->sysctl_hdr == NULL) {
3998                 if (!net_eq(net, &init_net))
3999                         kfree(tbl);
4000                 return -ENOMEM;
4001         }
4002         ip_vs_start_estimator(ipvs, &ipvs->tot_stats);
4003         ipvs->sysctl_tbl = tbl;
4004         /* Schedule defense work */
4005         INIT_DELAYED_WORK(&ipvs->defense_work, defense_work_handler);
4006         schedule_delayed_work(&ipvs->defense_work, DEFENSE_TIMER_PERIOD);
4007
4008         return 0;
4009 }
4010
4011 static void __net_exit ip_vs_control_net_cleanup_sysctl(struct netns_ipvs *ipvs)
4012 {
4013         struct net *net = ipvs->net;
4014
4015         cancel_delayed_work_sync(&ipvs->defense_work);
4016         cancel_work_sync(&ipvs->defense_work.work);
4017         unregister_net_sysctl_table(ipvs->sysctl_hdr);
4018         ip_vs_stop_estimator(ipvs, &ipvs->tot_stats);
4019
4020         if (!net_eq(net, &init_net))
4021                 kfree(ipvs->sysctl_tbl);
4022 }
4023
4024 #else
4025
4026 static int __net_init ip_vs_control_net_init_sysctl(struct netns_ipvs *ipvs) { return 0; }
4027 static void __net_exit ip_vs_control_net_cleanup_sysctl(struct netns_ipvs *ipvs) { }
4028
4029 #endif
4030
4031 static struct notifier_block ip_vs_dst_notifier = {
4032         .notifier_call = ip_vs_dst_event,
4033 #ifdef CONFIG_IP_VS_IPV6
4034         .priority = ADDRCONF_NOTIFY_PRIORITY + 5,
4035 #endif
4036 };
4037
4038 int __net_init ip_vs_control_net_init(struct netns_ipvs *ipvs)
4039 {
4040         int i, idx;
4041
4042         /* Initialize rs_table */
4043         for (idx = 0; idx < IP_VS_RTAB_SIZE; idx++)
4044                 INIT_HLIST_HEAD(&ipvs->rs_table[idx]);
4045
4046         INIT_LIST_HEAD(&ipvs->dest_trash);
4047         spin_lock_init(&ipvs->dest_trash_lock);
4048         setup_timer(&ipvs->dest_trash_timer, ip_vs_dest_trash_expire,
4049                     (unsigned long) ipvs);
4050         atomic_set(&ipvs->ftpsvc_counter, 0);
4051         atomic_set(&ipvs->nullsvc_counter, 0);
4052         atomic_set(&ipvs->conn_out_counter, 0);
4053
4054         /* procfs stats */
4055         ipvs->tot_stats.cpustats = alloc_percpu(struct ip_vs_cpu_stats);
4056         if (!ipvs->tot_stats.cpustats)
4057                 return -ENOMEM;
4058
4059         for_each_possible_cpu(i) {
4060                 struct ip_vs_cpu_stats *ipvs_tot_stats;
4061                 ipvs_tot_stats = per_cpu_ptr(ipvs->tot_stats.cpustats, i);
4062                 u64_stats_init(&ipvs_tot_stats->syncp);
4063         }
4064
4065         spin_lock_init(&ipvs->tot_stats.lock);
4066
4067         proc_create("ip_vs", 0, ipvs->net->proc_net, &ip_vs_info_fops);
4068         proc_create("ip_vs_stats", 0, ipvs->net->proc_net, &ip_vs_stats_fops);
4069         proc_create("ip_vs_stats_percpu", 0, ipvs->net->proc_net,
4070                     &ip_vs_stats_percpu_fops);
4071
4072         if (ip_vs_control_net_init_sysctl(ipvs))
4073                 goto err;
4074
4075         return 0;
4076
4077 err:
4078         free_percpu(ipvs->tot_stats.cpustats);
4079         return -ENOMEM;
4080 }
4081
4082 void __net_exit ip_vs_control_net_cleanup(struct netns_ipvs *ipvs)
4083 {
4084         ip_vs_trash_cleanup(ipvs);
4085         ip_vs_control_net_cleanup_sysctl(ipvs);
4086         remove_proc_entry("ip_vs_stats_percpu", ipvs->net->proc_net);
4087         remove_proc_entry("ip_vs_stats", ipvs->net->proc_net);
4088         remove_proc_entry("ip_vs", ipvs->net->proc_net);
4089         free_percpu(ipvs->tot_stats.cpustats);
4090 }
4091
4092 int __init ip_vs_register_nl_ioctl(void)
4093 {
4094         int ret;
4095
4096         ret = nf_register_sockopt(&ip_vs_sockopts);
4097         if (ret) {
4098                 pr_err("cannot register sockopt.\n");
4099                 goto err_sock;
4100         }
4101
4102         ret = ip_vs_genl_register();
4103         if (ret) {
4104                 pr_err("cannot register Generic Netlink interface.\n");
4105                 goto err_genl;
4106         }
4107         return 0;
4108
4109 err_genl:
4110         nf_unregister_sockopt(&ip_vs_sockopts);
4111 err_sock:
4112         return ret;
4113 }
4114
4115 void ip_vs_unregister_nl_ioctl(void)
4116 {
4117         ip_vs_genl_unregister();
4118         nf_unregister_sockopt(&ip_vs_sockopts);
4119 }
4120
4121 int __init ip_vs_control_init(void)
4122 {
4123         int idx;
4124         int ret;
4125
4126         EnterFunction(2);
4127
4128         /* Initialize svc_table, ip_vs_svc_fwm_table */
4129         for (idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
4130                 INIT_HLIST_HEAD(&ip_vs_svc_table[idx]);
4131                 INIT_HLIST_HEAD(&ip_vs_svc_fwm_table[idx]);
4132         }
4133
4134         smp_wmb();      /* Do we really need it now ? */
4135
4136         ret = register_netdevice_notifier(&ip_vs_dst_notifier);
4137         if (ret < 0)
4138                 return ret;
4139
4140         LeaveFunction(2);
4141         return 0;
4142 }
4143
4144
4145 void ip_vs_control_cleanup(void)
4146 {
4147         EnterFunction(2);
4148         unregister_netdevice_notifier(&ip_vs_dst_notifier);
4149         LeaveFunction(2);
4150 }