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         static int old_secure_tcp = 0;
 101         int availmem;
 102         int nomem;
 103         int to_change = -1;
 104
 105         /* we only count free and buffered memory (in pages) */
 106         si_meminfo(&i);
 107         availmem = i.freeram + i.bufferram;
 108         /* however in linux 2.5 the i.bufferram is total page cache size,
 109            we need adjust it */
 110         /* si_swapinfo(&i); */
 111         /* availmem = availmem - (i.totalswap - i.freeswap); */
 112
 113         nomem = (availmem < ipvs->sysctl_amemthresh);
 114
 115         local_bh_disable();
 116
 117         /* drop_entry */
 118         spin_lock(&ipvs->dropentry_lock);
 119         switch (ipvs->sysctl_drop_entry) {
 120         case 0:
 121                 atomic_set(&ipvs->dropentry, 0);
 122                 break;
 123         case 1:
 124                 if (nomem) {
 125                         atomic_set(&ipvs->dropentry, 1);
 126                         ipvs->sysctl_drop_entry = 2;
 127                 } else {
 128                         atomic_set(&ipvs->dropentry, 0);
 129                 }
 130                 break;
 131         case 2:
 132                 if (nomem) {
 133                         atomic_set(&ipvs->dropentry, 1);
 134                 } else {
 135                         atomic_set(&ipvs->dropentry, 0);
 136                         ipvs->sysctl_drop_entry = 1;
 137                 };
 138                 break;
 139         case 3:
 140                 atomic_set(&ipvs->dropentry, 1);
 141                 break;
 142         }
 143         spin_unlock(&ipvs->dropentry_lock);
 144
 145         /* drop_packet */
 146         spin_lock(&ipvs->droppacket_lock);
 147         switch (ipvs->sysctl_drop_packet) {
 148         case 0:
 149                 ipvs->drop_rate = 0;
 150                 break;
 151         case 1:
 152                 if (nomem) {
 153                         ipvs->drop_rate = ipvs->drop_counter
 154                                 = ipvs->sysctl_amemthresh /
 155                                 (ipvs->sysctl_amemthresh-availmem);
 156                         ipvs->sysctl_drop_packet = 2;
 157                 } else {
 158                         ipvs->drop_rate = 0;
 159                 }
 160                 break;
 161         case 2:
 162                 if (nomem) {
 163                         ipvs->drop_rate = ipvs->drop_counter
 164                                 = ipvs->sysctl_amemthresh /
 165                                 (ipvs->sysctl_amemthresh-availmem);
 166                 } else {
 167                         ipvs->drop_rate = 0;
 168                         ipvs->sysctl_drop_packet = 1;
 169                 }
 170                 break;
 171         case 3:
 172                 ipvs->drop_rate = ipvs->sysctl_am_droprate;
 173                 break;
 174         }
 175         spin_unlock(&ipvs->droppacket_lock);
 176
 177         /* secure_tcp */
 178         spin_lock(&ipvs->securetcp_lock);
 179         switch (ipvs->sysctl_secure_tcp) {
 180         case 0:
 181                 if (old_secure_tcp >= 2)
 182                         to_change = 0;
 183                 break;
 184         case 1:
 185                 if (nomem) {
 186                         if (old_secure_tcp < 2)
 187                                 to_change = 1;
 188                         ipvs->sysctl_secure_tcp = 2;
 189                 } else {
 190                         if (old_secure_tcp >= 2)
 191                                 to_change = 0;
 192                 }
 193                 break;
 194         case 2:
 195                 if (nomem) {
 196                         if (old_secure_tcp < 2)
 197                                 to_change = 1;
 198                 } else {
 199                         if (old_secure_tcp >= 2)
 200                                 to_change = 0;
 201                         ipvs->sysctl_secure_tcp = 1;
 202                 }
 203                 break;
 204         case 3:
 205                 if (old_secure_tcp < 2)
 206                         to_change = 1;
 207                 break;
 208         }
 209         old_secure_tcp = ipvs->sysctl_secure_tcp;
 210         if (to_change >= 0)
 211                 ip_vs_protocol_timeout_change(ipvs,
 212                                               ipvs->sysctl_secure_tcp > 1);
 213         spin_unlock(&ipvs->securetcp_lock);
 214
 215         local_bh_enable();
 216 }
 217
 218
 219 /*
 220  *      Timer for checking the defense
 221  */
 222 #define DEFENSE_TIMER_PERIOD    1*HZ
 223
 224 static void defense_work_handler(struct work_struct *work)
 225 {
 226         struct netns_ipvs *ipvs =
 227                 container_of(work, struct netns_ipvs, defense_work.work);
 228
 229         update_defense_level(ipvs);
 230         if (atomic_read(&ipvs->dropentry))
 231                 ip_vs_random_dropentry(ipvs->net);
 232         schedule_delayed_work(&ipvs->defense_work, DEFENSE_TIMER_PERIOD);
 233 }
 234 #endif
 235
 236 int
 237 ip_vs_use_count_inc(void)
 238 {
 239         return try_module_get(THIS_MODULE);
 240 }
 241
 242 void
 243 ip_vs_use_count_dec(void)
 244 {
 245         module_put(THIS_MODULE);
 246 }
 247
 248
 249 /*
 250  *      Hash table: for virtual service lookups
 251  */
 252 #define IP_VS_SVC_TAB_BITS 8
 253 #define IP_VS_SVC_TAB_SIZE (1 << IP_VS_SVC_TAB_BITS)
 254 #define IP_VS_SVC_TAB_MASK (IP_VS_SVC_TAB_SIZE - 1)
 255
 256 /* the service table hashed by <protocol, addr, port> */
 257 static struct hlist_head ip_vs_svc_table[IP_VS_SVC_TAB_SIZE];
 258 /* the service table hashed by fwmark */
 259 static struct hlist_head ip_vs_svc_fwm_table[IP_VS_SVC_TAB_SIZE];
 260
 261
 262 /*
 263  *      Returns hash value for virtual service
 264  */
 265 static inline unsigned int
 266 ip_vs_svc_hashkey(struct net *net, int af, unsigned int proto,
 267                   const union nf_inet_addr *addr, __be16 port)
 268 {
 269         register unsigned int porth = ntohs(port);
 270         __be32 addr_fold = addr->ip;
 271         __u32 ahash;
 272
 273 #ifdef CONFIG_IP_VS_IPV6
 274         if (af == AF_INET6)
 275                 addr_fold = addr->ip6[0]^addr->ip6[1]^
 276                             addr->ip6[2]^addr->ip6[3];
 277 #endif
 278         ahash = ntohl(addr_fold);
 279         ahash ^= ((size_t) net >> 8);
 280
 281         return (proto ^ ahash ^ (porth >> IP_VS_SVC_TAB_BITS) ^ porth) &
 282                IP_VS_SVC_TAB_MASK;
 283 }
 284
 285 /*
 286  *      Returns hash value of fwmark for virtual service lookup
 287  */
 288 static inline unsigned int ip_vs_svc_fwm_hashkey(struct net *net, __u32 fwmark)
 289 {
 290         return (((size_t)net>>8) ^ fwmark) & IP_VS_SVC_TAB_MASK;
 291 }
 292
 293 /*
 294  *      Hashes a service in the ip_vs_svc_table by <netns,proto,addr,port>
 295  *      or in the ip_vs_svc_fwm_table by fwmark.
 296  *      Should be called with locked tables.
 297  */
 298 static int ip_vs_svc_hash(struct ip_vs_service *svc)
 299 {
 300         unsigned int hash;
 301
 302         if (svc->flags & IP_VS_SVC_F_HASHED) {
 303                 pr_err("%s(): request for already hashed, called from %pF\n",
 304                        __func__, __builtin_return_address(0));
 305                 return 0;
 306         }
 307
 308         if (svc->fwmark == 0) {
 309                 /*
 310                  *  Hash it by <netns,protocol,addr,port> in ip_vs_svc_table
 311                  */
 312                 hash = ip_vs_svc_hashkey(svc->net, svc->af, svc->protocol,
 313                                          &svc->addr, svc->port);
 314                 hlist_add_head_rcu(&svc->s_list, &ip_vs_svc_table[hash]);
 315         } else {
 316                 /*
 317                  *  Hash it by fwmark in svc_fwm_table
 318                  */
 319                 hash = ip_vs_svc_fwm_hashkey(svc->net, svc->fwmark);
 320                 hlist_add_head_rcu(&svc->f_list, &ip_vs_svc_fwm_table[hash]);
 321         }
 322
 323         svc->flags |= IP_VS_SVC_F_HASHED;
 324         /* increase its refcnt because it is referenced by the svc table */
 325         atomic_inc(&svc->refcnt);
 326         return 1;
 327 }
 328
 329
 330 /*
 331  *      Unhashes a service from svc_table / svc_fwm_table.
 332  *      Should be called with locked tables.
 333  */
 334 static int ip_vs_svc_unhash(struct ip_vs_service *svc)
 335 {
 336         if (!(svc->flags & IP_VS_SVC_F_HASHED)) {
 337                 pr_err("%s(): request for unhash flagged, called from %pF\n",
 338                        __func__, __builtin_return_address(0));
 339                 return 0;
 340         }
 341
 342         if (svc->fwmark == 0) {
 343                 /* Remove it from the svc_table table */
 344                 hlist_del_rcu(&svc->s_list);
 345         } else {
 346                 /* Remove it from the svc_fwm_table table */
 347                 hlist_del_rcu(&svc->f_list);
 348         }
 349
 350         svc->flags &= ~IP_VS_SVC_F_HASHED;
 351         atomic_dec(&svc->refcnt);
 352         return 1;
 353 }
 354
 355
 356 /*
 357  *      Get service by {netns, proto,addr,port} in the service table.
 358  */
 359 static inline struct ip_vs_service *
 360 __ip_vs_service_find(struct net *net, int af, __u16 protocol,
 361                      const union nf_inet_addr *vaddr, __be16 vport)
 362 {
 363         unsigned int hash;
 364         struct ip_vs_service *svc;
 365
 366         /* Check for "full" addressed entries */
 367         hash = ip_vs_svc_hashkey(net, af, protocol, vaddr, vport);
 368
 369         hlist_for_each_entry_rcu(svc, &ip_vs_svc_table[hash], s_list) {
 370                 if ((svc->af == af)
 371                     && ip_vs_addr_equal(af, &svc->addr, vaddr)
 372                     && (svc->port == vport)
 373                     && (svc->protocol == protocol)
 374                     && net_eq(svc->net, net)) {
 375                         /* HIT */
 376                         return svc;
 377                 }
 378         }
 379
 380         return NULL;
 381 }
 382
 383
 384 /*
 385  *      Get service by {fwmark} in the service table.
 386  */
 387 static inline struct ip_vs_service *
 388 __ip_vs_svc_fwm_find(struct net *net, int af, __u32 fwmark)
 389 {
 390         unsigned int hash;
 391         struct ip_vs_service *svc;
 392
 393         /* Check for fwmark addressed entries */
 394         hash = ip_vs_svc_fwm_hashkey(net, fwmark);
 395
 396         hlist_for_each_entry_rcu(svc, &ip_vs_svc_fwm_table[hash], f_list) {
 397                 if (svc->fwmark == fwmark && svc->af == af
 398                     && net_eq(svc->net, net)) {
 399                         /* HIT */
 400                         return svc;
 401                 }
 402         }
 403
 404         return NULL;
 405 }
 406
 407 /* Find service, called under RCU lock */
 408 struct ip_vs_service *
 409 ip_vs_service_find(struct net *net, int af, __u32 fwmark, __u16 protocol,
 410                    const union nf_inet_addr *vaddr, __be16 vport)
 411 {
 412         struct ip_vs_service *svc;
 413         struct netns_ipvs *ipvs = net_ipvs(net);
 414
 415         /*
 416          *      Check the table hashed by fwmark first
 417          */
 418         if (fwmark) {
 419                 svc = __ip_vs_svc_fwm_find(net, af, fwmark);
 420                 if (svc)
 421                         goto out;
 422         }
 423
 424         /*
 425          *      Check the table hashed by <protocol,addr,port>
 426          *      for "full" addressed entries
 427          */
 428         svc = __ip_vs_service_find(net, af, protocol, vaddr, vport);
 429
 430         if (svc == NULL
 431             && protocol == IPPROTO_TCP
 432             && atomic_read(&ipvs->ftpsvc_counter)
 433             && (vport == FTPDATA || ntohs(vport) >= PROT_SOCK)) {
 434                 /*
 435                  * Check if ftp service entry exists, the packet
 436                  * might belong to FTP data connections.
 437                  */
 438                 svc = __ip_vs_service_find(net, af, protocol, vaddr, FTPPORT);
 439         }
 440
 441         if (svc == NULL
 442             && atomic_read(&ipvs->nullsvc_counter)) {
 443                 /*
 444                  * Check if the catch-all port (port zero) exists
 445                  */
 446                 svc = __ip_vs_service_find(net, af, protocol, vaddr, 0);
 447         }
 448
 449   out:
 450         IP_VS_DBG_BUF(9, "lookup service: fwm %u %s %s:%u %s\n",
 451                       fwmark, ip_vs_proto_name(protocol),
 452                       IP_VS_DBG_ADDR(af, vaddr), ntohs(vport),
 453                       svc ? "hit" : "not hit");
 454
 455         return svc;
 456 }
 457
 458
 459 static inline void
 460 __ip_vs_bind_svc(struct ip_vs_dest *dest, struct ip_vs_service *svc)
 461 {
 462         atomic_inc(&svc->refcnt);
 463         rcu_assign_pointer(dest->svc, svc);
 464 }
 465
 466 static void ip_vs_service_free(struct ip_vs_service *svc)
 467 {
 468         if (svc->stats.cpustats)
 469                 free_percpu(svc->stats.cpustats);
 470         kfree(svc);
 471 }
 472
 473 static void ip_vs_service_rcu_free(struct rcu_head *head)
 474 {
 475         struct ip_vs_service *svc;
 476
 477         svc = container_of(head, struct ip_vs_service, rcu_head);
 478         ip_vs_service_free(svc);
 479 }
 480
 481 static void __ip_vs_svc_put(struct ip_vs_service *svc, bool do_delay)
 482 {
 483         if (atomic_dec_and_test(&svc->refcnt)) {
 484                 IP_VS_DBG_BUF(3, "Removing service %u/%s:%u\n",
 485                               svc->fwmark,
 486                               IP_VS_DBG_ADDR(svc->af, &svc->addr),
 487                               ntohs(svc->port));
 488                 if (do_delay)
 489                         call_rcu(&svc->rcu_head, ip_vs_service_rcu_free);
 490                 else
 491                         ip_vs_service_free(svc);
 492         }
 493 }
 494
 495
 496 /*
 497  *      Returns hash value for real service
 498  */
 499 static inline unsigned int ip_vs_rs_hashkey(int af,
 500                                             const union nf_inet_addr *addr,
 501                                             __be16 port)
 502 {
 503         register unsigned int porth = ntohs(port);
 504         __be32 addr_fold = addr->ip;
 505
 506 #ifdef CONFIG_IP_VS_IPV6
 507         if (af == AF_INET6)
 508                 addr_fold = addr->ip6[0]^addr->ip6[1]^
 509                             addr->ip6[2]^addr->ip6[3];
 510 #endif
 511
 512         return (ntohl(addr_fold)^(porth>>IP_VS_RTAB_BITS)^porth)
 513                 & IP_VS_RTAB_MASK;
 514 }
 515
 516 /* Hash ip_vs_dest in rs_table by <proto,addr,port>. */
 517 static void ip_vs_rs_hash(struct netns_ipvs *ipvs, struct ip_vs_dest *dest)
 518 {
 519         unsigned int hash;
 520
 521         if (dest->in_rs_table)
 522                 return;
 523
 524         /*
 525          *      Hash by proto,addr,port,
 526          *      which are the parameters of the real service.
 527          */
 528         hash = ip_vs_rs_hashkey(dest->af, &dest->addr, dest->port);
 529
 530         hlist_add_head_rcu(&dest->d_list, &ipvs->rs_table[hash]);
 531         dest->in_rs_table = 1;
 532 }
 533
 534 /* Unhash ip_vs_dest from rs_table. */
 535 static void ip_vs_rs_unhash(struct ip_vs_dest *dest)
 536 {
 537         /*
 538          * Remove it from the rs_table table.
 539          */
 540         if (dest->in_rs_table) {
 541                 hlist_del_rcu(&dest->d_list);
 542                 dest->in_rs_table = 0;
 543         }
 544 }
 545
 546 /* Check if real service by <proto,addr,port> is present */
 547 bool ip_vs_has_real_service(struct net *net, int af, __u16 protocol,
 548                             const union nf_inet_addr *daddr, __be16 dport)
 549 {
 550         struct netns_ipvs *ipvs = net_ipvs(net);
 551         unsigned int hash;
 552         struct ip_vs_dest *dest;
 553
 554         /* Check for "full" addressed entries */
 555         hash = ip_vs_rs_hashkey(af, daddr, dport);
 556
 557         rcu_read_lock();
 558         hlist_for_each_entry_rcu(dest, &ipvs->rs_table[hash], d_list) {
 559                 if (dest->port == dport &&
 560                     dest->af == af &&
 561                     ip_vs_addr_equal(af, &dest->addr, daddr) &&
 562                     (dest->protocol == protocol || dest->vfwmark)) {
 563                         /* HIT */
 564                         rcu_read_unlock();
 565                         return true;
 566                 }
 567         }
 568         rcu_read_unlock();
 569
 570         return false;
 571 }
 572
 573 /* Lookup destination by {addr,port} in the given service
 574  * Called under RCU lock.
 575  */
 576 static struct ip_vs_dest *
 577 ip_vs_lookup_dest(struct ip_vs_service *svc, const union nf_inet_addr *daddr,
 578                   __be16 dport)
 579 {
 580         struct ip_vs_dest *dest;
 581
 582         /*
 583          * Find the destination for the given service
 584          */
 585         list_for_each_entry_rcu(dest, &svc->destinations, n_list) {
 586                 if ((dest->af == svc->af)
 587                     && ip_vs_addr_equal(svc->af, &dest->addr, daddr)
 588                     && (dest->port == dport)) {
 589                         /* HIT */
 590                         return dest;
 591                 }
 592         }
 593
 594         return NULL;
 595 }
 596
 597 /*
 598  * Find destination by {daddr,dport,vaddr,protocol}
 599  * Created to be used in ip_vs_process_message() in
 600  * the backup synchronization daemon. It finds the
 601  * destination to be bound to the received connection
 602  * on the backup.
 603  * Called under RCU lock, no refcnt is returned.
 604  */
 605 struct ip_vs_dest *ip_vs_find_dest(struct net  *net, int af,
 606                                    const union nf_inet_addr *daddr,
 607                                    __be16 dport,
 608                                    const union nf_inet_addr *vaddr,
 609                                    __be16 vport, __u16 protocol, __u32 fwmark,
 610                                    __u32 flags)
 611 {
 612         struct ip_vs_dest *dest;
 613         struct ip_vs_service *svc;
 614         __be16 port = dport;
 615
 616         svc = ip_vs_service_find(net, af, fwmark, protocol, vaddr, vport);
 617         if (!svc)
 618                 return NULL;
 619         if (fwmark && (flags & IP_VS_CONN_F_FWD_MASK) != IP_VS_CONN_F_MASQ)
 620                 port = 0;
 621         dest = ip_vs_lookup_dest(svc, daddr, port);
 622         if (!dest)
 623                 dest = ip_vs_lookup_dest(svc, daddr, port ^ dport);
 624         return dest;
 625 }
 626
 627 void ip_vs_dest_dst_rcu_free(struct rcu_head *head)
 628 {
 629         struct ip_vs_dest_dst *dest_dst = container_of(head,
 630                                                        struct ip_vs_dest_dst,
 631                                                        rcu_head);
 632
 633         dst_release(dest_dst->dst_cache);
 634         kfree(dest_dst);
 635 }
 636
 637 /* Release dest_dst and dst_cache for dest in user context */
 638 static void __ip_vs_dst_cache_reset(struct ip_vs_dest *dest)
 639 {
 640         struct ip_vs_dest_dst *old;
 641
 642         old = rcu_dereference_protected(dest->dest_dst, 1);
 643         if (old) {
 644                 RCU_INIT_POINTER(dest->dest_dst, NULL);
 645                 call_rcu(&old->rcu_head, ip_vs_dest_dst_rcu_free);
 646         }
 647 }
 648
 649 /*
 650  *  Lookup dest by {svc,addr,port} in the destination trash.
 651  *  The destination trash is used to hold the destinations that are removed
 652  *  from the service table but are still referenced by some conn entries.
 653  *  The reason to add the destination trash is when the dest is temporary
 654  *  down (either by administrator or by monitor program), the dest can be
 655  *  picked back from the trash, the remaining connections to the dest can
 656  *  continue, and the counting information of the dest is also useful for
 657  *  scheduling.
 658  */
 659 static struct ip_vs_dest *
 660 ip_vs_trash_get_dest(struct ip_vs_service *svc, const union nf_inet_addr *daddr,
 661                      __be16 dport)
 662 {
 663         struct ip_vs_dest *dest;
 664         struct netns_ipvs *ipvs = net_ipvs(svc->net);
 665
 666         /*
 667          * Find the destination in trash
 668          */
 669         spin_lock_bh(&ipvs->dest_trash_lock);
 670         list_for_each_entry(dest, &ipvs->dest_trash, t_list) {
 671                 IP_VS_DBG_BUF(3, "Destination %u/%s:%u still in trash, "
 672                               "dest->refcnt=%d\n",
 673                               dest->vfwmark,
 674                               IP_VS_DBG_ADDR(svc->af, &dest->addr),
 675                               ntohs(dest->port),
 676                               atomic_read(&dest->refcnt));
 677                 if (dest->af == svc->af &&
 678                     ip_vs_addr_equal(svc->af, &dest->addr, daddr) &&
 679                     dest->port == dport &&
 680                     dest->vfwmark == svc->fwmark &&
 681                     dest->protocol == svc->protocol &&
 682                     (svc->fwmark ||
 683                      (ip_vs_addr_equal(svc->af, &dest->vaddr, &svc->addr) &&
 684                       dest->vport == svc->port))) {
 685                         /* HIT */
 686                         list_del(&dest->t_list);
 687                         ip_vs_dest_hold(dest);
 688                         goto out;
 689                 }
 690         }
 691
 692         dest = NULL;
 693
 694 out:
 695         spin_unlock_bh(&ipvs->dest_trash_lock);
 696
 697         return dest;
 698 }
 699
 700 static void ip_vs_dest_free(struct ip_vs_dest *dest)
 701 {
 702         struct ip_vs_service *svc = rcu_dereference_protected(dest->svc, 1);
 703
 704         __ip_vs_dst_cache_reset(dest);
 705         __ip_vs_svc_put(svc, false);
 706         free_percpu(dest->stats.cpustats);
 707         ip_vs_dest_put_and_free(dest);
 708 }
 709
 710 /*
 711  *  Clean up all the destinations in the trash
 712  *  Called by the ip_vs_control_cleanup()
 713  *
 714  *  When the ip_vs_control_clearup is activated by ipvs module exit,
 715  *  the service tables must have been flushed and all the connections
 716  *  are expired, and the refcnt of each destination in the trash must
 717  *  be 0, so we simply release them here.
 718  */
 719 static void ip_vs_trash_cleanup(struct net *net)
 720 {
 721         struct ip_vs_dest *dest, *nxt;
 722         struct netns_ipvs *ipvs = net_ipvs(net);
 723
 724         del_timer_sync(&ipvs->dest_trash_timer);
 725         /* No need to use dest_trash_lock */
 726         list_for_each_entry_safe(dest, nxt, &ipvs->dest_trash, t_list) {
 727                 list_del(&dest->t_list);
 728                 ip_vs_dest_free(dest);
 729         }
 730 }
 731
 732 static void
 733 ip_vs_copy_stats(struct ip_vs_stats_user *dst, struct ip_vs_stats *src)
 734 {
 735 #define IP_VS_SHOW_STATS_COUNTER(c) dst->c = src->ustats.c - src->ustats0.c
 736
 737         spin_lock_bh(&src->lock);
 738
 739         IP_VS_SHOW_STATS_COUNTER(conns);
 740         IP_VS_SHOW_STATS_COUNTER(inpkts);
 741         IP_VS_SHOW_STATS_COUNTER(outpkts);
 742         IP_VS_SHOW_STATS_COUNTER(inbytes);
 743         IP_VS_SHOW_STATS_COUNTER(outbytes);
 744
 745         ip_vs_read_estimator(dst, src);
 746
 747         spin_unlock_bh(&src->lock);
 748 }
 749
 750 static void
 751 ip_vs_zero_stats(struct ip_vs_stats *stats)
 752 {
 753         spin_lock_bh(&stats->lock);
 754
 755         /* get current counters as zero point, rates are zeroed */
 756
 757 #define IP_VS_ZERO_STATS_COUNTER(c) stats->ustats0.c = stats->ustats.c
 758
 759         IP_VS_ZERO_STATS_COUNTER(conns);
 760         IP_VS_ZERO_STATS_COUNTER(inpkts);
 761         IP_VS_ZERO_STATS_COUNTER(outpkts);
 762         IP_VS_ZERO_STATS_COUNTER(inbytes);
 763         IP_VS_ZERO_STATS_COUNTER(outbytes);
 764
 765         ip_vs_zero_estimator(stats);
 766
 767         spin_unlock_bh(&stats->lock);
 768 }
 769
 770 /*
 771  *      Update a destination in the given service
 772  */
 773 static void
 774 __ip_vs_update_dest(struct ip_vs_service *svc, struct ip_vs_dest *dest,
 775                     struct ip_vs_dest_user_kern *udest, int add)
 776 {
 777         struct netns_ipvs *ipvs = net_ipvs(svc->net);
 778         struct ip_vs_service *old_svc;
 779         struct ip_vs_scheduler *sched;
 780         int conn_flags;
 781
 782         /* set the weight and the flags */
 783         atomic_set(&dest->weight, udest->weight);
 784         conn_flags = udest->conn_flags & IP_VS_CONN_F_DEST_MASK;
 785         conn_flags |= IP_VS_CONN_F_INACTIVE;
 786
 787         /* set the IP_VS_CONN_F_NOOUTPUT flag if not masquerading/NAT */
 788         if ((conn_flags & IP_VS_CONN_F_FWD_MASK) != IP_VS_CONN_F_MASQ) {
 789                 conn_flags |= IP_VS_CONN_F_NOOUTPUT;
 790         } else {
 791                 /*
 792                  *    Put the real service in rs_table if not present.
 793                  *    For now only for NAT!
 794                  */
 795                 ip_vs_rs_hash(ipvs, dest);
 796         }
 797         atomic_set(&dest->conn_flags, conn_flags);
 798
 799         /* bind the service */
 800         old_svc = rcu_dereference_protected(dest->svc, 1);
 801         if (!old_svc) {
 802                 __ip_vs_bind_svc(dest, svc);
 803         } else {
 804                 if (old_svc != svc) {
 805                         ip_vs_zero_stats(&dest->stats);
 806                         __ip_vs_bind_svc(dest, svc);
 807                         __ip_vs_svc_put(old_svc, true);
 808                 }
 809         }
 810
 811         /* set the dest status flags */
 812         dest->flags |= IP_VS_DEST_F_AVAILABLE;
 813
 814         if (udest->u_threshold == 0 || udest->u_threshold > dest->u_threshold)
 815                 dest->flags &= ~IP_VS_DEST_F_OVERLOAD;
 816         dest->u_threshold = udest->u_threshold;
 817         dest->l_threshold = udest->l_threshold;
 818
 819         spin_lock_bh(&dest->dst_lock);
 820         __ip_vs_dst_cache_reset(dest);
 821         spin_unlock_bh(&dest->dst_lock);
 822
 823         sched = rcu_dereference_protected(svc->scheduler, 1);
 824         if (add) {
 825                 ip_vs_start_estimator(svc->net, &dest->stats);
 826                 list_add_rcu(&dest->n_list, &svc->destinations);
 827                 svc->num_dests++;
 828                 if (sched->add_dest)
 829                         sched->add_dest(svc, dest);
 830         } else {
 831                 if (sched->upd_dest)
 832                         sched->upd_dest(svc, dest);
 833         }
 834 }
 835
 836
 837 /*
 838  *      Create a destination for the given service
 839  */
 840 static int
 841 ip_vs_new_dest(struct ip_vs_service *svc, struct ip_vs_dest_user_kern *udest,
 842                struct ip_vs_dest **dest_p)
 843 {
 844         struct ip_vs_dest *dest;
 845         unsigned int atype, i;
 846
 847         EnterFunction(2);
 848
 849 #ifdef CONFIG_IP_VS_IPV6
 850         if (svc->af == AF_INET6) {
 851                 atype = ipv6_addr_type(&udest->addr.in6);
 852                 if ((!(atype & IPV6_ADDR_UNICAST) ||
 853                         atype & IPV6_ADDR_LINKLOCAL) &&
 854                         !__ip_vs_addr_is_local_v6(svc->net, &udest->addr.in6))
 855                         return -EINVAL;
 856         } else
 857 #endif
 858         {
 859                 atype = inet_addr_type(svc->net, udest->addr.ip);
 860                 if (atype != RTN_LOCAL && atype != RTN_UNICAST)
 861                         return -EINVAL;
 862         }
 863
 864         dest = kzalloc(sizeof(struct ip_vs_dest), GFP_KERNEL);
 865         if (dest == NULL)
 866                 return -ENOMEM;
 867
 868         dest->stats.cpustats = alloc_percpu(struct ip_vs_cpu_stats);
 869         if (!dest->stats.cpustats)
 870                 goto err_alloc;
 871
 872         for_each_possible_cpu(i) {
 873                 struct ip_vs_cpu_stats *ip_vs_dest_stats;
 874                 ip_vs_dest_stats = per_cpu_ptr(dest->stats.cpustats, i);
 875                 u64_stats_init(&ip_vs_dest_stats->syncp);
 876         }
 877
 878         dest->af = svc->af;
 879         dest->protocol = svc->protocol;
 880         dest->vaddr = svc->addr;
 881         dest->vport = svc->port;
 882         dest->vfwmark = svc->fwmark;
 883         ip_vs_addr_copy(svc->af, &dest->addr, &udest->addr);
 884         dest->port = udest->port;
 885
 886         atomic_set(&dest->activeconns, 0);
 887         atomic_set(&dest->inactconns, 0);
 888         atomic_set(&dest->persistconns, 0);
 889         atomic_set(&dest->refcnt, 1);
 890
 891         INIT_HLIST_NODE(&dest->d_list);
 892         spin_lock_init(&dest->dst_lock);
 893         spin_lock_init(&dest->stats.lock);
 894         __ip_vs_update_dest(svc, dest, udest, 1);
 895
 896         *dest_p = dest;
 897
 898         LeaveFunction(2);
 899         return 0;
 900
 901 err_alloc:
 902         kfree(dest);
 903         return -ENOMEM;
 904 }
 905
 906
 907 /*
 908  *      Add a destination into an existing service
 909  */
 910 static int
 911 ip_vs_add_dest(struct ip_vs_service *svc, struct ip_vs_dest_user_kern *udest)
 912 {
 913         struct ip_vs_dest *dest;
 914         union nf_inet_addr daddr;
 915         __be16 dport = udest->port;
 916         int ret;
 917
 918         EnterFunction(2);
 919
 920         if (udest->weight < 0) {
 921                 pr_err("%s(): server weight less than zero\n", __func__);
 922                 return -ERANGE;
 923         }
 924
 925         if (udest->l_threshold > udest->u_threshold) {
 926                 pr_err("%s(): lower threshold is higher than upper threshold\n",
 927                         __func__);
 928                 return -ERANGE;
 929         }
 930
 931         ip_vs_addr_copy(svc->af, &daddr, &udest->addr);
 932
 933         /* We use function that requires RCU lock */
 934         rcu_read_lock();
 935         dest = ip_vs_lookup_dest(svc, &daddr, dport);
 936         rcu_read_unlock();
 937
 938         if (dest != NULL) {
 939                 IP_VS_DBG(1, "%s(): dest already exists\n", __func__);
 940                 return -EEXIST;
 941         }
 942
 943         /*
 944          * Check if the dest already exists in the trash and
 945          * is from the same service
 946          */
 947         dest = ip_vs_trash_get_dest(svc, &daddr, dport);
 948
 949         if (dest != NULL) {
 950                 IP_VS_DBG_BUF(3, "Get destination %s:%u from trash, "
 951                               "dest->refcnt=%d, service %u/%s:%u\n",
 952                               IP_VS_DBG_ADDR(svc->af, &daddr), ntohs(dport),
 953                               atomic_read(&dest->refcnt),
 954                               dest->vfwmark,
 955                               IP_VS_DBG_ADDR(svc->af, &dest->vaddr),
 956                               ntohs(dest->vport));
 957
 958                 __ip_vs_update_dest(svc, dest, udest, 1);
 959                 ret = 0;
 960         } else {
 961                 /*
 962                  * Allocate and initialize the dest structure
 963                  */
 964                 ret = ip_vs_new_dest(svc, udest, &dest);
 965         }
 966         LeaveFunction(2);
 967
 968         return ret;
 969 }
 970
 971
 972 /*
 973  *      Edit a destination in the given service
 974  */
 975 static int
 976 ip_vs_edit_dest(struct ip_vs_service *svc, struct ip_vs_dest_user_kern *udest)
 977 {
 978         struct ip_vs_dest *dest;
 979         union nf_inet_addr daddr;
 980         __be16 dport = udest->port;
 981
 982         EnterFunction(2);
 983
 984         if (udest->weight < 0) {
 985                 pr_err("%s(): server weight less than zero\n", __func__);
 986                 return -ERANGE;
 987         }
 988
 989         if (udest->l_threshold > udest->u_threshold) {
 990                 pr_err("%s(): lower threshold is higher than upper threshold\n",
 991                         __func__);
 992                 return -ERANGE;
 993         }
 994
 995         ip_vs_addr_copy(svc->af, &daddr, &udest->addr);
 996
 997         /* We use function that requires RCU lock */
 998         rcu_read_lock();
 999         dest = ip_vs_lookup_dest(svc, &daddr, dport);
1000         rcu_read_unlock();
1001
1002         if (dest == NULL) {
1003                 IP_VS_DBG(1, "%s(): dest doesn't exist\n", __func__);
1004                 return -ENOENT;
1005         }
1006
1007         __ip_vs_update_dest(svc, dest, udest, 0);
1008         LeaveFunction(2);
1009
1010         return 0;
1011 }
1012
1013 /*
1014  *      Delete a destination (must be already unlinked from the service)
1015  */
1016 static void __ip_vs_del_dest(struct net *net, struct ip_vs_dest *dest,
1017                              bool cleanup)
1018 {
1019         struct netns_ipvs *ipvs = net_ipvs(net);
1020
1021         ip_vs_stop_estimator(net, &dest->stats);
1022
1023         /*
1024          *  Remove it from the d-linked list with the real services.
1025          */
1026         ip_vs_rs_unhash(dest);
1027
1028         spin_lock_bh(&ipvs->dest_trash_lock);
1029         IP_VS_DBG_BUF(3, "Moving dest %s:%u into trash, dest->refcnt=%d\n",
1030                       IP_VS_DBG_ADDR(dest->af, &dest->addr), ntohs(dest->port),
1031                       atomic_read(&dest->refcnt));
1032         if (list_empty(&ipvs->dest_trash) && !cleanup)
1033                 mod_timer(&ipvs->dest_trash_timer,
1034                           jiffies + (IP_VS_DEST_TRASH_PERIOD >> 1));
1035         /* dest lives in trash without reference */
1036         list_add(&dest->t_list, &ipvs->dest_trash);
1037         dest->idle_start = 0;
1038         spin_unlock_bh(&ipvs->dest_trash_lock);
1039         ip_vs_dest_put(dest);
1040 }
1041
1042
1043 /*
1044  *      Unlink a destination from the given service
1045  */
1046 static void __ip_vs_unlink_dest(struct ip_vs_service *svc,
1047                                 struct ip_vs_dest *dest,
1048                                 int svcupd)
1049 {
1050         dest->flags &= ~IP_VS_DEST_F_AVAILABLE;
1051
1052         /*
1053          *  Remove it from the d-linked destination list.
1054          */
1055         list_del_rcu(&dest->n_list);
1056         svc->num_dests--;
1057
1058         if (svcupd) {
1059                 struct ip_vs_scheduler *sched;
1060
1061                 sched = rcu_dereference_protected(svc->scheduler, 1);
1062                 if (sched->del_dest)
1063                         sched->del_dest(svc, dest);
1064         }
1065 }
1066
1067
1068 /*
1069  *      Delete a destination server in the given service
1070  */
1071 static int
1072 ip_vs_del_dest(struct ip_vs_service *svc, struct ip_vs_dest_user_kern *udest)
1073 {
1074         struct ip_vs_dest *dest;
1075         __be16 dport = udest->port;
1076
1077         EnterFunction(2);
1078
1079         /* We use function that requires RCU lock */
1080         rcu_read_lock();
1081         dest = ip_vs_lookup_dest(svc, &udest->addr, dport);
1082         rcu_read_unlock();
1083
1084         if (dest == NULL) {
1085                 IP_VS_DBG(1, "%s(): destination not found!\n", __func__);
1086                 return -ENOENT;
1087         }
1088
1089         /*
1090          *      Unlink dest from the service
1091          */
1092         __ip_vs_unlink_dest(svc, dest, 1);
1093
1094         /*
1095          *      Delete the destination
1096          */
1097         __ip_vs_del_dest(svc->net, dest, false);
1098
1099         LeaveFunction(2);
1100
1101         return 0;
1102 }
1103
1104 static void ip_vs_dest_trash_expire(unsigned long data)
1105 {
1106         struct net *net = (struct net *) data;
1107         struct netns_ipvs *ipvs = net_ipvs(net);
1108         struct ip_vs_dest *dest, *next;
1109         unsigned long now = jiffies;
1110
1111         spin_lock(&ipvs->dest_trash_lock);
1112         list_for_each_entry_safe(dest, next, &ipvs->dest_trash, t_list) {
1113                 if (atomic_read(&dest->refcnt) > 0)
1114                         continue;
1115                 if (dest->idle_start) {
1116                         if (time_before(now, dest->idle_start +
1117                                              IP_VS_DEST_TRASH_PERIOD))
1118                                 continue;
1119                 } else {
1120                         dest->idle_start = max(1UL, now);
1121                         continue;
1122                 }
1123                 IP_VS_DBG_BUF(3, "Removing destination %u/%s:%u from trash\n",
1124                               dest->vfwmark,
1125                               IP_VS_DBG_ADDR(dest->af, &dest->addr),
1126                               ntohs(dest->port));
1127                 list_del(&dest->t_list);
1128                 ip_vs_dest_free(dest);
1129         }
1130         if (!list_empty(&ipvs->dest_trash))
1131                 mod_timer(&ipvs->dest_trash_timer,
1132                           jiffies + (IP_VS_DEST_TRASH_PERIOD >> 1));
1133         spin_unlock(&ipvs->dest_trash_lock);
1134 }
1135
1136 /*
1137  *      Add a service into the service hash table
1138  */
1139 static int
1140 ip_vs_add_service(struct net *net, struct ip_vs_service_user_kern *u,
1141                   struct ip_vs_service **svc_p)
1142 {
1143         int ret = 0, i;
1144         struct ip_vs_scheduler *sched = NULL;
1145         struct ip_vs_pe *pe = NULL;
1146         struct ip_vs_service *svc = NULL;
1147         struct netns_ipvs *ipvs = net_ipvs(net);
1148
1149         /* increase the module use count */
1150         ip_vs_use_count_inc();
1151
1152         /* Lookup the scheduler by 'u->sched_name' */
1153         sched = ip_vs_scheduler_get(u->sched_name);
1154         if (sched == NULL) {
1155                 pr_info("Scheduler module ip_vs_%s not found\n", u->sched_name);
1156                 ret = -ENOENT;
1157                 goto out_err;
1158         }
1159
1160         if (u->pe_name && *u->pe_name) {
1161                 pe = ip_vs_pe_getbyname(u->pe_name);
1162                 if (pe == NULL) {
1163                         pr_info("persistence engine module ip_vs_pe_%s "
1164                                 "not found\n", u->pe_name);
1165                         ret = -ENOENT;
1166                         goto out_err;
1167                 }
1168         }
1169
1170 #ifdef CONFIG_IP_VS_IPV6
1171         if (u->af == AF_INET6) {
1172                 __u32 plen = (__force __u32) u->netmask;
1173
1174                 if (plen < 1 || plen > 128) {
1175                         ret = -EINVAL;
1176                         goto out_err;
1177                 }
1178         }
1179 #endif
1180
1181         svc = kzalloc(sizeof(struct ip_vs_service), GFP_KERNEL);
1182         if (svc == NULL) {
1183                 IP_VS_DBG(1, "%s(): no memory\n", __func__);
1184                 ret = -ENOMEM;
1185                 goto out_err;
1186         }
1187         svc->stats.cpustats = alloc_percpu(struct ip_vs_cpu_stats);
1188         if (!svc->stats.cpustats) {
1189                 ret = -ENOMEM;
1190                 goto out_err;
1191         }
1192
1193         for_each_possible_cpu(i) {
1194                 struct ip_vs_cpu_stats *ip_vs_stats;
1195                 ip_vs_stats = per_cpu_ptr(svc->stats.cpustats, i);
1196                 u64_stats_init(&ip_vs_stats->syncp);
1197         }
1198
1199
1200         /* I'm the first user of the service */
1201         atomic_set(&svc->refcnt, 0);
1202
1203         svc->af = u->af;
1204         svc->protocol = u->protocol;
1205         ip_vs_addr_copy(svc->af, &svc->addr, &u->addr);
1206         svc->port = u->port;
1207         svc->fwmark = u->fwmark;
1208         svc->flags = u->flags;
1209         svc->timeout = u->timeout * HZ;
1210         svc->netmask = u->netmask;
1211         svc->net = net;
1212
1213         INIT_LIST_HEAD(&svc->destinations);
1214         spin_lock_init(&svc->sched_lock);
1215         spin_lock_init(&svc->stats.lock);
1216
1217         /* Bind the scheduler */
1218         ret = ip_vs_bind_scheduler(svc, sched);
1219         if (ret)
1220                 goto out_err;
1221         sched = NULL;
1222
1223         /* Bind the ct retriever */
1224         RCU_INIT_POINTER(svc->pe, pe);
1225         pe = NULL;
1226
1227         /* Update the virtual service counters */
1228         if (svc->port == FTPPORT)
1229                 atomic_inc(&ipvs->ftpsvc_counter);
1230         else if (svc->port == 0)
1231                 atomic_inc(&ipvs->nullsvc_counter);
1232
1233         ip_vs_start_estimator(net, &svc->stats);
1234
1235         /* Count only IPv4 services for old get/setsockopt interface */
1236         if (svc->af == AF_INET)
1237                 ipvs->num_services++;
1238
1239         /* Hash the service into the service table */
1240         ip_vs_svc_hash(svc);
1241
1242         *svc_p = svc;
1243         /* Now there is a service - full throttle */
1244         ipvs->enable = 1;
1245         return 0;
1246
1247
1248  out_err:
1249         if (svc != NULL) {
1250                 ip_vs_unbind_scheduler(svc, sched);
1251                 ip_vs_service_free(svc);
1252         }
1253         ip_vs_scheduler_put(sched);
1254         ip_vs_pe_put(pe);
1255
1256         /* decrease the module use count */
1257         ip_vs_use_count_dec();
1258
1259         return ret;
1260 }
1261
1262
1263 /*
1264  *      Edit a service and bind it with a new scheduler
1265  */
1266 static int
1267 ip_vs_edit_service(struct ip_vs_service *svc, struct ip_vs_service_user_kern *u)
1268 {
1269         struct ip_vs_scheduler *sched, *old_sched;
1270         struct ip_vs_pe *pe = NULL, *old_pe = NULL;
1271         int ret = 0;
1272
1273         /*
1274          * Lookup the scheduler, by 'u->sched_name'
1275          */
1276         sched = ip_vs_scheduler_get(u->sched_name);
1277         if (sched == NULL) {
1278                 pr_info("Scheduler module ip_vs_%s not found\n", u->sched_name);
1279                 return -ENOENT;
1280         }
1281         old_sched = sched;
1282
1283         if (u->pe_name && *u->pe_name) {
1284                 pe = ip_vs_pe_getbyname(u->pe_name);
1285                 if (pe == NULL) {
1286                         pr_info("persistence engine module ip_vs_pe_%s "
1287                                 "not found\n", u->pe_name);
1288                         ret = -ENOENT;
1289                         goto out;
1290                 }
1291                 old_pe = pe;
1292         }
1293
1294 #ifdef CONFIG_IP_VS_IPV6
1295         if (u->af == AF_INET6) {
1296                 __u32 plen = (__force __u32) u->netmask;
1297
1298                 if (plen < 1 || plen > 128) {
1299                         ret = -EINVAL;
1300                         goto out;
1301                 }
1302         }
1303 #endif
1304
1305         old_sched = rcu_dereference_protected(svc->scheduler, 1);
1306         if (sched != old_sched) {
1307                 /* Bind the new scheduler */
1308                 ret = ip_vs_bind_scheduler(svc, sched);
1309                 if (ret) {
1310                         old_sched = sched;
1311                         goto out;
1312                 }
1313                 /* Unbind the old scheduler on success */
1314                 ip_vs_unbind_scheduler(svc, old_sched);
1315         }
1316
1317         /*
1318          * Set the flags and timeout value
1319          */
1320         svc->flags = u->flags | IP_VS_SVC_F_HASHED;
1321         svc->timeout = u->timeout * HZ;
1322         svc->netmask = u->netmask;
1323
1324         old_pe = rcu_dereference_protected(svc->pe, 1);
1325         if (pe != old_pe)
1326                 rcu_assign_pointer(svc->pe, pe);
1327
1328 out:
1329         ip_vs_scheduler_put(old_sched);
1330         ip_vs_pe_put(old_pe);
1331         return ret;
1332 }
1333
1334 /*
1335  *      Delete a service from the service list
1336  *      - The service must be unlinked, unlocked and not referenced!
1337  *      - We are called under _bh lock
1338  */
1339 static void __ip_vs_del_service(struct ip_vs_service *svc, bool cleanup)
1340 {
1341         struct ip_vs_dest *dest, *nxt;
1342         struct ip_vs_scheduler *old_sched;
1343         struct ip_vs_pe *old_pe;
1344         struct netns_ipvs *ipvs = net_ipvs(svc->net);
1345
1346         pr_info("%s: enter\n", __func__);
1347
1348         /* Count only IPv4 services for old get/setsockopt interface */
1349         if (svc->af == AF_INET)
1350                 ipvs->num_services--;
1351
1352         ip_vs_stop_estimator(svc->net, &svc->stats);
1353
1354         /* Unbind scheduler */
1355         old_sched = rcu_dereference_protected(svc->scheduler, 1);
1356         ip_vs_unbind_scheduler(svc, old_sched);
1357         ip_vs_scheduler_put(old_sched);
1358
1359         /* Unbind persistence engine, keep svc->pe */
1360         old_pe = rcu_dereference_protected(svc->pe, 1);
1361         ip_vs_pe_put(old_pe);
1362
1363         /*
1364          *    Unlink the whole destination list
1365          */
1366         list_for_each_entry_safe(dest, nxt, &svc->destinations, n_list) {
1367                 __ip_vs_unlink_dest(svc, dest, 0);
1368                 __ip_vs_del_dest(svc->net, dest, cleanup);
1369         }
1370
1371         /*
1372          *    Update the virtual service counters
1373          */
1374         if (svc->port == FTPPORT)
1375                 atomic_dec(&ipvs->ftpsvc_counter);
1376         else if (svc->port == 0)
1377                 atomic_dec(&ipvs->nullsvc_counter);
1378
1379         /*
1380          *    Free the service if nobody refers to it
1381          */
1382         __ip_vs_svc_put(svc, true);
1383
1384         /* decrease the module use count */
1385         ip_vs_use_count_dec();
1386 }
1387
1388 /*
1389  * Unlink a service from list and try to delete it if its refcnt reached 0
1390  */
1391 static void ip_vs_unlink_service(struct ip_vs_service *svc, bool cleanup)
1392 {
1393         /* Hold svc to avoid double release from dest_trash */
1394         atomic_inc(&svc->refcnt);
1395         /*
1396          * Unhash it from the service table
1397          */
1398         ip_vs_svc_unhash(svc);
1399
1400         __ip_vs_del_service(svc, cleanup);
1401 }
1402
1403 /*
1404  *      Delete a service from the service list
1405  */
1406 static int ip_vs_del_service(struct ip_vs_service *svc)
1407 {
1408         if (svc == NULL)
1409                 return -EEXIST;
1410         ip_vs_unlink_service(svc, false);
1411
1412         return 0;
1413 }
1414
1415
1416 /*
1417  *      Flush all the virtual services
1418  */
1419 static int ip_vs_flush(struct net *net, bool cleanup)
1420 {
1421         int idx;
1422         struct ip_vs_service *svc;
1423         struct hlist_node *n;
1424
1425         /*
1426          * Flush the service table hashed by <netns,protocol,addr,port>
1427          */
1428         for(idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
1429                 hlist_for_each_entry_safe(svc, n, &ip_vs_svc_table[idx],
1430                                           s_list) {
1431                         if (net_eq(svc->net, net))
1432                                 ip_vs_unlink_service(svc, cleanup);
1433                 }
1434         }
1435
1436         /*
1437          * Flush the service table hashed by fwmark
1438          */
1439         for(idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
1440                 hlist_for_each_entry_safe(svc, n, &ip_vs_svc_fwm_table[idx],
1441                                           f_list) {
1442                         if (net_eq(svc->net, net))
1443                                 ip_vs_unlink_service(svc, cleanup);
1444                 }
1445         }
1446
1447         return 0;
1448 }
1449
1450 /*
1451  *      Delete service by {netns} in the service table.
1452  *      Called by __ip_vs_cleanup()
1453  */
1454 void ip_vs_service_net_cleanup(struct net *net)
1455 {
1456         EnterFunction(2);
1457         /* Check for "full" addressed entries */
1458         mutex_lock(&__ip_vs_mutex);
1459         ip_vs_flush(net, true);
1460         mutex_unlock(&__ip_vs_mutex);
1461         LeaveFunction(2);
1462 }
1463
1464 /* Put all references for device (dst_cache) */
1465 static inline void
1466 ip_vs_forget_dev(struct ip_vs_dest *dest, struct net_device *dev)
1467 {
1468         struct ip_vs_dest_dst *dest_dst;
1469
1470         spin_lock_bh(&dest->dst_lock);
1471         dest_dst = rcu_dereference_protected(dest->dest_dst, 1);
1472         if (dest_dst && dest_dst->dst_cache->dev == dev) {
1473                 IP_VS_DBG_BUF(3, "Reset dev:%s dest %s:%u ,dest->refcnt=%d\n",
1474                               dev->name,
1475                               IP_VS_DBG_ADDR(dest->af, &dest->addr),
1476                               ntohs(dest->port),
1477                               atomic_read(&dest->refcnt));
1478                 __ip_vs_dst_cache_reset(dest);
1479         }
1480         spin_unlock_bh(&dest->dst_lock);
1481
1482 }
1483 /* Netdev event receiver
1484  * Currently only NETDEV_DOWN is handled to release refs to cached dsts
1485  */
1486 static int ip_vs_dst_event(struct notifier_block *this, unsigned long event,
1487                            void *ptr)
1488 {
1489         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1490         struct net *net = dev_net(dev);
1491         struct netns_ipvs *ipvs = net_ipvs(net);
1492         struct ip_vs_service *svc;
1493         struct ip_vs_dest *dest;
1494         unsigned int idx;
1495
1496         if (event != NETDEV_DOWN || !ipvs)
1497                 return NOTIFY_DONE;
1498         IP_VS_DBG(3, "%s() dev=%s\n", __func__, dev->name);
1499         EnterFunction(2);
1500         mutex_lock(&__ip_vs_mutex);
1501         for (idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
1502                 hlist_for_each_entry(svc, &ip_vs_svc_table[idx], s_list) {
1503                         if (net_eq(svc->net, net)) {
1504                                 list_for_each_entry(dest, &svc->destinations,
1505                                                     n_list) {
1506                                         ip_vs_forget_dev(dest, dev);
1507                                 }
1508                         }
1509                 }
1510
1511                 hlist_for_each_entry(svc, &ip_vs_svc_fwm_table[idx], f_list) {
1512                         if (net_eq(svc->net, net)) {
1513                                 list_for_each_entry(dest, &svc->destinations,
1514                                                     n_list) {
1515                                         ip_vs_forget_dev(dest, dev);
1516                                 }
1517                         }
1518
1519                 }
1520         }
1521
1522         spin_lock_bh(&ipvs->dest_trash_lock);
1523         list_for_each_entry(dest, &ipvs->dest_trash, t_list) {
1524                 ip_vs_forget_dev(dest, dev);
1525         }
1526         spin_unlock_bh(&ipvs->dest_trash_lock);
1527         mutex_unlock(&__ip_vs_mutex);
1528         LeaveFunction(2);
1529         return NOTIFY_DONE;
1530 }
1531
1532 /*
1533  *      Zero counters in a service or all services
1534  */
1535 static int ip_vs_zero_service(struct ip_vs_service *svc)
1536 {
1537         struct ip_vs_dest *dest;
1538
1539         list_for_each_entry(dest, &svc->destinations, n_list) {
1540                 ip_vs_zero_stats(&dest->stats);
1541         }
1542         ip_vs_zero_stats(&svc->stats);
1543         return 0;
1544 }
1545
1546 static int ip_vs_zero_all(struct net *net)
1547 {
1548         int idx;
1549         struct ip_vs_service *svc;
1550
1551         for(idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
1552                 hlist_for_each_entry(svc, &ip_vs_svc_table[idx], s_list) {
1553                         if (net_eq(svc->net, net))
1554                                 ip_vs_zero_service(svc);
1555                 }
1556         }
1557
1558         for(idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
1559                 hlist_for_each_entry(svc, &ip_vs_svc_fwm_table[idx], f_list) {
1560                         if (net_eq(svc->net, net))
1561                                 ip_vs_zero_service(svc);
1562                 }
1563         }
1564
1565         ip_vs_zero_stats(&net_ipvs(net)->tot_stats);
1566         return 0;
1567 }
1568
1569 #ifdef CONFIG_SYSCTL
1570
1571 static int zero;
1572 static int three = 3;
1573
1574 static int
1575 proc_do_defense_mode(struct ctl_table *table, int write,
1576                      void __user *buffer, size_t *lenp, loff_t *ppos)
1577 {
1578         struct net *net = current->nsproxy->net_ns;
1579         int *valp = table->data;
1580         int val = *valp;
1581         int rc;
1582
1583         rc = proc_dointvec(table, write, buffer, lenp, ppos);
1584         if (write && (*valp != val)) {
1585                 if ((*valp < 0) || (*valp > 3)) {
1586                         /* Restore the correct value */
1587                         *valp = val;
1588                 } else {
1589                         update_defense_level(net_ipvs(net));
1590                 }
1591         }
1592         return rc;
1593 }
1594
1595 static int
1596 proc_do_sync_threshold(struct ctl_table *table, int write,
1597                        void __user *buffer, size_t *lenp, loff_t *ppos)
1598 {
1599         int *valp = table->data;
1600         int val[2];
1601         int rc;
1602
1603         /* backup the value first */
1604         memcpy(val, valp, sizeof(val));
1605
1606         rc = proc_dointvec(table, write, buffer, lenp, ppos);
1607         if (write && (valp[0] < 0 || valp[1] < 0 ||
1608             (valp[0] >= valp[1] && valp[1]))) {
1609                 /* Restore the correct value */
1610                 memcpy(valp, val, sizeof(val));
1611         }
1612         return rc;
1613 }
1614
1615 static int
1616 proc_do_sync_mode(struct ctl_table *table, int write,
1617                      void __user *buffer, size_t *lenp, loff_t *ppos)
1618 {
1619         int *valp = table->data;
1620         int val = *valp;
1621         int rc;
1622
1623         rc = proc_dointvec(table, write, buffer, lenp, ppos);
1624         if (write && (*valp != val)) {
1625                 if ((*valp < 0) || (*valp > 1)) {
1626                         /* Restore the correct value */
1627                         *valp = val;
1628                 }
1629         }
1630         return rc;
1631 }
1632
1633 static int
1634 proc_do_sync_ports(struct ctl_table *table, int write,
1635                    void __user *buffer, size_t *lenp, loff_t *ppos)
1636 {
1637         int *valp = table->data;
1638         int val = *valp;
1639         int rc;
1640
1641         rc = proc_dointvec(table, write, buffer, lenp, ppos);
1642         if (write && (*valp != val)) {
1643                 if (*valp < 1 || !is_power_of_2(*valp)) {
1644                         /* Restore the correct value */
1645                         *valp = val;
1646                 }
1647         }
1648         return rc;
1649 }
1650
1651 /*
1652  *      IPVS sysctl table (under the /proc/sys/net/ipv4/vs/)
1653  *      Do not change order or insert new entries without
1654  *      align with netns init in ip_vs_control_net_init()
1655  */
1656
1657 static struct ctl_table vs_vars[] = {
1658         {
1659                 .procname       = "amemthresh",
1660                 .maxlen         = sizeof(int),
1661                 .mode           = 0644,
1662                 .proc_handler   = proc_dointvec,
1663         },
1664         {
1665                 .procname       = "am_droprate",
1666                 .maxlen         = sizeof(int),
1667                 .mode           = 0644,
1668                 .proc_handler   = proc_dointvec,
1669         },
1670         {
1671                 .procname       = "drop_entry",
1672                 .maxlen         = sizeof(int),
1673                 .mode           = 0644,
1674                 .proc_handler   = proc_do_defense_mode,
1675         },
1676         {
1677                 .procname       = "drop_packet",
1678                 .maxlen         = sizeof(int),
1679                 .mode           = 0644,
1680                 .proc_handler   = proc_do_defense_mode,
1681         },
1682 #ifdef CONFIG_IP_VS_NFCT
1683         {
1684                 .procname       = "conntrack",
1685                 .maxlen         = sizeof(int),
1686                 .mode           = 0644,
1687                 .proc_handler   = &proc_dointvec,
1688         },
1689 #endif
1690         {
1691                 .procname       = "secure_tcp",
1692                 .maxlen         = sizeof(int),
1693                 .mode           = 0644,
1694                 .proc_handler   = proc_do_defense_mode,
1695         },
1696         {
1697                 .procname       = "snat_reroute",
1698                 .maxlen         = sizeof(int),
1699                 .mode           = 0644,
1700                 .proc_handler   = &proc_dointvec,
1701         },
1702         {
1703                 .procname       = "sync_version",
1704                 .maxlen         = sizeof(int),
1705                 .mode           = 0644,
1706                 .proc_handler   = &proc_do_sync_mode,
1707         },
1708         {
1709                 .procname       = "sync_ports",
1710                 .maxlen         = sizeof(int),
1711                 .mode           = 0644,
1712                 .proc_handler   = &proc_do_sync_ports,
1713         },
1714         {
1715                 .procname       = "sync_persist_mode",
1716                 .maxlen         = sizeof(int),
1717                 .mode           = 0644,
1718                 .proc_handler   = proc_dointvec,
1719         },
1720         {
1721                 .procname       = "sync_qlen_max",
1722                 .maxlen         = sizeof(unsigned long),
1723                 .mode           = 0644,
1724                 .proc_handler   = proc_doulongvec_minmax,
1725         },
1726         {
1727                 .procname       = "sync_sock_size",
1728                 .maxlen         = sizeof(int),
1729                 .mode           = 0644,
1730                 .proc_handler   = proc_dointvec,
1731         },
1732         {
1733                 .procname       = "cache_bypass",
1734                 .maxlen         = sizeof(int),
1735                 .mode           = 0644,
1736                 .proc_handler   = proc_dointvec,
1737         },
1738         {
1739                 .procname       = "expire_nodest_conn",
1740                 .maxlen         = sizeof(int),
1741                 .mode           = 0644,
1742                 .proc_handler   = proc_dointvec,
1743         },
1744         {
1745                 .procname       = "sloppy_tcp",
1746                 .maxlen         = sizeof(int),
1747                 .mode           = 0644,
1748                 .proc_handler   = proc_dointvec,
1749         },
1750         {
1751                 .procname       = "sloppy_sctp",
1752                 .maxlen         = sizeof(int),
1753                 .mode           = 0644,
1754                 .proc_handler   = proc_dointvec,
1755         },
1756         {
1757                 .procname       = "expire_quiescent_template",
1758                 .maxlen         = sizeof(int),
1759                 .mode           = 0644,
1760                 .proc_handler   = proc_dointvec,
1761         },
1762         {
1763                 .procname       = "sync_threshold",
1764                 .maxlen         =
1765                         sizeof(((struct netns_ipvs *)0)->sysctl_sync_threshold),
1766                 .mode           = 0644,
1767                 .proc_handler   = proc_do_sync_threshold,
1768         },
1769         {
1770                 .procname       = "sync_refresh_period",
1771                 .maxlen         = sizeof(int),
1772                 .mode           = 0644,
1773                 .proc_handler   = proc_dointvec_jiffies,
1774         },
1775         {
1776                 .procname       = "sync_retries",
1777                 .maxlen         = sizeof(int),
1778                 .mode           = 0644,
1779                 .proc_handler   = proc_dointvec_minmax,
1780                 .extra1         = &zero,
1781                 .extra2         = &three,
1782         },
1783         {
1784                 .procname       = "nat_icmp_send",
1785                 .maxlen         = sizeof(int),
1786                 .mode           = 0644,
1787                 .proc_handler   = proc_dointvec,
1788         },
1789         {
1790                 .procname       = "pmtu_disc",
1791                 .maxlen         = sizeof(int),
1792                 .mode           = 0644,
1793                 .proc_handler   = proc_dointvec,
1794         },
1795         {
1796                 .procname       = "backup_only",
1797                 .maxlen         = sizeof(int),
1798                 .mode           = 0644,
1799                 .proc_handler   = proc_dointvec,
1800         },
1801 #ifdef CONFIG_IP_VS_DEBUG
1802         {
1803                 .procname       = "debug_level",
1804                 .data           = &sysctl_ip_vs_debug_level,
1805                 .maxlen         = sizeof(int),
1806                 .mode           = 0644,
1807                 .proc_handler   = proc_dointvec,
1808         },
1809 #endif
1810         { }
1811 };
1812
1813 #endif
1814
1815 #ifdef CONFIG_PROC_FS
1816
1817 struct ip_vs_iter {
1818         struct seq_net_private p;  /* Do not move this, netns depends upon it*/
1819         struct hlist_head *table;
1820         int bucket;
1821 };
1822
1823 /*
1824  *      Write the contents of the VS rule table to a PROCfs file.
1825  *      (It is kept just for backward compatibility)
1826  */
1827 static inline const char *ip_vs_fwd_name(unsigned int flags)
1828 {
1829         switch (flags & IP_VS_CONN_F_FWD_MASK) {
1830         case IP_VS_CONN_F_LOCALNODE:
1831                 return "Local";
1832         case IP_VS_CONN_F_TUNNEL:
1833                 return "Tunnel";
1834         case IP_VS_CONN_F_DROUTE:
1835                 return "Route";
1836         default:
1837                 return "Masq";
1838         }
1839 }
1840
1841
1842 /* Get the Nth entry in the two lists */
1843 static struct ip_vs_service *ip_vs_info_array(struct seq_file *seq, loff_t pos)
1844 {
1845         struct net *net = seq_file_net(seq);
1846         struct ip_vs_iter *iter = seq->private;
1847         int idx;
1848         struct ip_vs_service *svc;
1849
1850         /* look in hash by protocol */
1851         for (idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
1852                 hlist_for_each_entry_rcu(svc, &ip_vs_svc_table[idx], s_list) {
1853                         if (net_eq(svc->net, net) && pos-- == 0) {
1854                                 iter->table = ip_vs_svc_table;
1855                                 iter->bucket = idx;
1856                                 return svc;
1857                         }
1858                 }
1859         }
1860
1861         /* keep looking in fwmark */
1862         for (idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
1863                 hlist_for_each_entry_rcu(svc, &ip_vs_svc_fwm_table[idx],
1864                                          f_list) {
1865                         if (net_eq(svc->net, net) && pos-- == 0) {
1866                                 iter->table = ip_vs_svc_fwm_table;
1867                                 iter->bucket = idx;
1868                                 return svc;
1869                         }
1870                 }
1871         }
1872
1873         return NULL;
1874 }
1875
1876 static void *ip_vs_info_seq_start(struct seq_file *seq, loff_t *pos)
1877         __acquires(RCU)
1878 {
1879         rcu_read_lock();
1880         return *pos ? ip_vs_info_array(seq, *pos - 1) : SEQ_START_TOKEN;
1881 }
1882
1883
1884 static void *ip_vs_info_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1885 {
1886         struct hlist_node *e;
1887         struct ip_vs_iter *iter;
1888         struct ip_vs_service *svc;
1889
1890         ++*pos;
1891         if (v == SEQ_START_TOKEN)
1892                 return ip_vs_info_array(seq,0);
1893
1894         svc = v;
1895         iter = seq->private;
1896
1897         if (iter->table == ip_vs_svc_table) {
1898                 /* next service in table hashed by protocol */
1899                 e = rcu_dereference(hlist_next_rcu(&svc->s_list));
1900                 if (e)
1901                         return hlist_entry(e, struct ip_vs_service, s_list);
1902
1903                 while (++iter->bucket < IP_VS_SVC_TAB_SIZE) {
1904                         hlist_for_each_entry_rcu(svc,
1905                                                  &ip_vs_svc_table[iter->bucket],
1906                                                  s_list) {
1907                                 return svc;
1908                         }
1909                 }
1910
1911                 iter->table = ip_vs_svc_fwm_table;
1912                 iter->bucket = -1;
1913                 goto scan_fwmark;
1914         }
1915
1916         /* next service in hashed by fwmark */
1917         e = rcu_dereference(hlist_next_rcu(&svc->f_list));
1918         if (e)
1919                 return hlist_entry(e, struct ip_vs_service, f_list);
1920
1921  scan_fwmark:
1922         while (++iter->bucket < IP_VS_SVC_TAB_SIZE) {
1923                 hlist_for_each_entry_rcu(svc,
1924                                          &ip_vs_svc_fwm_table[iter->bucket],
1925                                          f_list)
1926                         return svc;
1927         }
1928
1929         return NULL;
1930 }
1931
1932 static void ip_vs_info_seq_stop(struct seq_file *seq, void *v)
1933         __releases(RCU)
1934 {
1935         rcu_read_unlock();
1936 }
1937
1938
1939 static int ip_vs_info_seq_show(struct seq_file *seq, void *v)
1940 {
1941         if (v == SEQ_START_TOKEN) {
1942                 seq_printf(seq,
1943                         "IP Virtual Server version %d.%d.%d (size=%d)\n",
1944                         NVERSION(IP_VS_VERSION_CODE), ip_vs_conn_tab_size);
1945                 seq_puts(seq,
1946                          "Prot LocalAddress:Port Scheduler Flags\n");
1947                 seq_puts(seq,
1948                          "  -> RemoteAddress:Port Forward Weight ActiveConn InActConn\n");
1949         } else {
1950                 const struct ip_vs_service *svc = v;
1951                 const struct ip_vs_iter *iter = seq->private;
1952                 const struct ip_vs_dest *dest;
1953                 struct ip_vs_scheduler *sched = rcu_dereference(svc->scheduler);
1954
1955                 if (iter->table == ip_vs_svc_table) {
1956 #ifdef CONFIG_IP_VS_IPV6
1957                         if (svc->af == AF_INET6)
1958                                 seq_printf(seq, "%s  [%pI6]:%04X %s ",
1959                                            ip_vs_proto_name(svc->protocol),
1960                                            &svc->addr.in6,
1961                                            ntohs(svc->port),
1962                                            sched->name);
1963                         else
1964 #endif
1965                                 seq_printf(seq, "%s  %08X:%04X %s %s ",
1966                                            ip_vs_proto_name(svc->protocol),
1967                                            ntohl(svc->addr.ip),
1968                                            ntohs(svc->port),
1969                                            sched->name,
1970                                            (svc->flags & IP_VS_SVC_F_ONEPACKET)?"ops ":"");
1971                 } else {
1972                         seq_printf(seq, "FWM  %08X %s %s",
1973                                    svc->fwmark, sched->name,
1974                                    (svc->flags & IP_VS_SVC_F_ONEPACKET)?"ops ":"");
1975                 }
1976
1977                 if (svc->flags & IP_VS_SVC_F_PERSISTENT)
1978                         seq_printf(seq, "persistent %d %08X\n",
1979                                 svc->timeout,
1980                                 ntohl(svc->netmask));
1981                 else
1982                         seq_putc(seq, '\n');
1983
1984                 list_for_each_entry_rcu(dest, &svc->destinations, n_list) {
1985 #ifdef CONFIG_IP_VS_IPV6
1986                         if (dest->af == AF_INET6)
1987                                 seq_printf(seq,
1988                                            "  -> [%pI6]:%04X"
1989                                            "      %-7s %-6d %-10d %-10d\n",
1990                                            &dest->addr.in6,
1991                                            ntohs(dest->port),
1992                                            ip_vs_fwd_name(atomic_read(&dest->conn_flags)),
1993                                            atomic_read(&dest->weight),
1994                                            atomic_read(&dest->activeconns),
1995                                            atomic_read(&dest->inactconns));
1996                         else
1997 #endif
1998                                 seq_printf(seq,
1999                                            "  -> %08X:%04X      "
2000                                            "%-7s %-6d %-10d %-10d\n",
2001                                            ntohl(dest->addr.ip),
2002                                            ntohs(dest->port),
2003                                            ip_vs_fwd_name(atomic_read(&dest->conn_flags)),
2004                                            atomic_read(&dest->weight),
2005                                            atomic_read(&dest->activeconns),
2006                                            atomic_read(&dest->inactconns));
2007
2008                 }
2009         }
2010         return 0;
2011 }
2012
2013 static const struct seq_operations ip_vs_info_seq_ops = {
2014         .start = ip_vs_info_seq_start,
2015         .next  = ip_vs_info_seq_next,
2016         .stop  = ip_vs_info_seq_stop,
2017         .show  = ip_vs_info_seq_show,
2018 };
2019
2020 static int ip_vs_info_open(struct inode *inode, struct file *file)
2021 {
2022         return seq_open_net(inode, file, &ip_vs_info_seq_ops,
2023                         sizeof(struct ip_vs_iter));
2024 }
2025
2026 static const struct file_operations ip_vs_info_fops = {
2027         .owner   = THIS_MODULE,
2028         .open    = ip_vs_info_open,
2029         .read    = seq_read,
2030         .llseek  = seq_lseek,
2031         .release = seq_release_net,
2032 };
2033
2034 static int ip_vs_stats_show(struct seq_file *seq, void *v)
2035 {
2036         struct net *net = seq_file_single_net(seq);
2037         struct ip_vs_stats_user show;
2038
2039 /*               01234567 01234567 01234567 0123456701234567 0123456701234567 */
2040         seq_puts(seq,
2041                  "   Total Incoming Outgoing         Incoming         Outgoing\n");
2042         seq_printf(seq,
2043                    "   Conns  Packets  Packets            Bytes            Bytes\n");
2044
2045         ip_vs_copy_stats(&show, &net_ipvs(net)->tot_stats);
2046         seq_printf(seq, "%8X %8X %8X %16LX %16LX\n\n", show.conns,
2047                    show.inpkts, show.outpkts,
2048                    (unsigned long long) show.inbytes,
2049                    (unsigned long long) show.outbytes);
2050
2051 /*                 01234567 01234567 01234567 0123456701234567 0123456701234567 */
2052         seq_puts(seq,
2053                    " Conns/s   Pkts/s   Pkts/s          Bytes/s          Bytes/s\n");
2054         seq_printf(seq, "%8X %8X %8X %16X %16X\n",
2055                         show.cps, show.inpps, show.outpps,
2056                         show.inbps, show.outbps);
2057
2058         return 0;
2059 }
2060
2061 static int ip_vs_stats_seq_open(struct inode *inode, struct file *file)
2062 {
2063         return single_open_net(inode, file, ip_vs_stats_show);
2064 }
2065
2066 static const struct file_operations ip_vs_stats_fops = {
2067         .owner = THIS_MODULE,
2068         .open = ip_vs_stats_seq_open,
2069         .read = seq_read,
2070         .llseek = seq_lseek,
2071         .release = single_release_net,
2072 };
2073
2074 static int ip_vs_stats_percpu_show(struct seq_file *seq, void *v)
2075 {
2076         struct net *net = seq_file_single_net(seq);
2077         struct ip_vs_stats *tot_stats = &net_ipvs(net)->tot_stats;
2078         struct ip_vs_cpu_stats __percpu *cpustats = tot_stats->cpustats;
2079         struct ip_vs_stats_user rates;
2080         int i;
2081
2082 /*               01234567 01234567 01234567 0123456701234567 0123456701234567 */
2083         seq_puts(seq,
2084                  "       Total Incoming Outgoing         Incoming         Outgoing\n");
2085         seq_printf(seq,
2086                    "CPU    Conns  Packets  Packets            Bytes            Bytes\n");
2087
2088         for_each_possible_cpu(i) {
2089                 struct ip_vs_cpu_stats *u = per_cpu_ptr(cpustats, i);
2090                 unsigned int start;
2091                 __u64 inbytes, outbytes;
2092
2093                 do {
2094                         start = u64_stats_fetch_begin_irq(&u->syncp);
2095                         inbytes = u->ustats.inbytes;
2096                         outbytes = u->ustats.outbytes;
2097                 } while (u64_stats_fetch_retry_irq(&u->syncp, start));
2098
2099                 seq_printf(seq, "%3X %8X %8X %8X %16LX %16LX\n",
2100                            i, u->ustats.conns, u->ustats.inpkts,
2101                            u->ustats.outpkts, (__u64)inbytes,
2102                            (__u64)outbytes);
2103         }
2104
2105         spin_lock_bh(&tot_stats->lock);
2106
2107         seq_printf(seq, "  ~ %8X %8X %8X %16LX %16LX\n\n",
2108                    tot_stats->ustats.conns, tot_stats->ustats.inpkts,
2109                    tot_stats->ustats.outpkts,
2110                    (unsigned long long) tot_stats->ustats.inbytes,
2111                    (unsigned long long) tot_stats->ustats.outbytes);
2112
2113         ip_vs_read_estimator(&rates, tot_stats);
2114
2115         spin_unlock_bh(&tot_stats->lock);
2116
2117 /*                 01234567 01234567 01234567 0123456701234567 0123456701234567 */
2118         seq_puts(seq,
2119                    "     Conns/s   Pkts/s   Pkts/s          Bytes/s          Bytes/s\n");
2120         seq_printf(seq, "    %8X %8X %8X %16X %16X\n",
2121                         rates.cps,
2122                         rates.inpps,
2123                         rates.outpps,
2124                         rates.inbps,
2125                         rates.outbps);
2126
2127         return 0;
2128 }
2129
2130 static int ip_vs_stats_percpu_seq_open(struct inode *inode, struct file *file)
2131 {
2132         return single_open_net(inode, file, ip_vs_stats_percpu_show);
2133 }
2134
2135 static const struct file_operations ip_vs_stats_percpu_fops = {
2136         .owner = THIS_MODULE,
2137         .open = ip_vs_stats_percpu_seq_open,
2138         .read = seq_read,
2139         .llseek = seq_lseek,
2140         .release = single_release_net,
2141 };
2142 #endif
2143
2144 /*
2145  *      Set timeout values for tcp tcpfin udp in the timeout_table.
2146  */
2147 static int ip_vs_set_timeout(struct net *net, struct ip_vs_timeout_user *u)
2148 {
2149 #if defined(CONFIG_IP_VS_PROTO_TCP) || defined(CONFIG_IP_VS_PROTO_UDP)
2150         struct ip_vs_proto_data *pd;
2151 #endif
2152
2153         IP_VS_DBG(2, "Setting timeout tcp:%d tcpfin:%d udp:%d\n",
2154                   u->tcp_timeout,
2155                   u->tcp_fin_timeout,
2156                   u->udp_timeout);
2157
2158 #ifdef CONFIG_IP_VS_PROTO_TCP
2159         if (u->tcp_timeout) {
2160                 pd = ip_vs_proto_data_get(net, IPPROTO_TCP);
2161                 pd->timeout_table[IP_VS_TCP_S_ESTABLISHED]
2162                         = u->tcp_timeout * HZ;
2163         }
2164
2165         if (u->tcp_fin_timeout) {
2166                 pd = ip_vs_proto_data_get(net, IPPROTO_TCP);
2167                 pd->timeout_table[IP_VS_TCP_S_FIN_WAIT]
2168                         = u->tcp_fin_timeout * HZ;
2169         }
2170 #endif
2171
2172 #ifdef CONFIG_IP_VS_PROTO_UDP
2173         if (u->udp_timeout) {
2174                 pd = ip_vs_proto_data_get(net, IPPROTO_UDP);
2175                 pd->timeout_table[IP_VS_UDP_S_NORMAL]
2176                         = u->udp_timeout * HZ;
2177         }
2178 #endif
2179         return 0;
2180 }
2181
2182
2183 #define SET_CMDID(cmd)          (cmd - IP_VS_BASE_CTL)
2184 #define SERVICE_ARG_LEN         (sizeof(struct ip_vs_service_user))
2185 #define SVCDEST_ARG_LEN         (sizeof(struct ip_vs_service_user) +    \
2186                                  sizeof(struct ip_vs_dest_user))
2187 #define TIMEOUT_ARG_LEN         (sizeof(struct ip_vs_timeout_user))
2188 #define DAEMON_ARG_LEN          (sizeof(struct ip_vs_daemon_user))
2189 #define MAX_ARG_LEN             SVCDEST_ARG_LEN
2190
2191 static const unsigned char set_arglen[SET_CMDID(IP_VS_SO_SET_MAX)+1] = {
2192         [SET_CMDID(IP_VS_SO_SET_ADD)]           = SERVICE_ARG_LEN,
2193         [SET_CMDID(IP_VS_SO_SET_EDIT)]          = SERVICE_ARG_LEN,
2194         [SET_CMDID(IP_VS_SO_SET_DEL)]           = SERVICE_ARG_LEN,
2195         [SET_CMDID(IP_VS_SO_SET_FLUSH)]         = 0,
2196         [SET_CMDID(IP_VS_SO_SET_ADDDEST)]       = SVCDEST_ARG_LEN,
2197         [SET_CMDID(IP_VS_SO_SET_DELDEST)]       = SVCDEST_ARG_LEN,
2198         [SET_CMDID(IP_VS_SO_SET_EDITDEST)]      = SVCDEST_ARG_LEN,
2199         [SET_CMDID(IP_VS_SO_SET_TIMEOUT)]       = TIMEOUT_ARG_LEN,
2200         [SET_CMDID(IP_VS_SO_SET_STARTDAEMON)]   = DAEMON_ARG_LEN,
2201         [SET_CMDID(IP_VS_SO_SET_STOPDAEMON)]    = DAEMON_ARG_LEN,
2202         [SET_CMDID(IP_VS_SO_SET_ZERO)]          = SERVICE_ARG_LEN,
2203 };
2204
2205 static void ip_vs_copy_usvc_compat(struct ip_vs_service_user_kern *usvc,
2206                                   struct ip_vs_service_user *usvc_compat)
2207 {
2208         memset(usvc, 0, sizeof(*usvc));
2209
2210         usvc->af                = AF_INET;
2211         usvc->protocol          = usvc_compat->protocol;
2212         usvc->addr.ip           = usvc_compat->addr;
2213         usvc->port              = usvc_compat->port;
2214         usvc->fwmark            = usvc_compat->fwmark;
2215
2216         /* Deep copy of sched_name is not needed here */
2217         usvc->sched_name        = usvc_compat->sched_name;
2218
2219         usvc->flags             = usvc_compat->flags;
2220         usvc->timeout           = usvc_compat->timeout;
2221         usvc->netmask           = usvc_compat->netmask;
2222 }
2223
2224 static void ip_vs_copy_udest_compat(struct ip_vs_dest_user_kern *udest,
2225                                    struct ip_vs_dest_user *udest_compat)
2226 {
2227         memset(udest, 0, sizeof(*udest));
2228
2229         udest->addr.ip          = udest_compat->addr;
2230         udest->port             = udest_compat->port;
2231         udest->conn_flags       = udest_compat->conn_flags;
2232         udest->weight           = udest_compat->weight;
2233         udest->u_threshold      = udest_compat->u_threshold;
2234         udest->l_threshold      = udest_compat->l_threshold;
2235 }
2236
2237 static int
2238 do_ip_vs_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len)
2239 {
2240         struct net *net = sock_net(sk);
2241         int ret;
2242         unsigned char arg[MAX_ARG_LEN];
2243         struct ip_vs_service_user *usvc_compat;
2244         struct ip_vs_service_user_kern usvc;
2245         struct ip_vs_service *svc;
2246         struct ip_vs_dest_user *udest_compat;
2247         struct ip_vs_dest_user_kern udest;
2248         struct netns_ipvs *ipvs = net_ipvs(net);
2249
2250         if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
2251                 return -EPERM;
2252
2253         if (cmd < IP_VS_BASE_CTL || cmd > IP_VS_SO_SET_MAX)
2254                 return -EINVAL;
2255         if (len < 0 || len >  MAX_ARG_LEN)
2256                 return -EINVAL;
2257         if (len != set_arglen[SET_CMDID(cmd)]) {
2258                 pr_err("set_ctl: len %u != %u\n",
2259                        len, set_arglen[SET_CMDID(cmd)]);
2260                 return -EINVAL;
2261         }
2262
2263         if (copy_from_user(arg, user, len) != 0)
2264                 return -EFAULT;
2265
2266         /* increase the module use count */
2267         ip_vs_use_count_inc();
2268
2269         /* Handle daemons since they have another lock */
2270         if (cmd == IP_VS_SO_SET_STARTDAEMON ||
2271             cmd == IP_VS_SO_SET_STOPDAEMON) {
2272                 struct ip_vs_daemon_user *dm = (struct ip_vs_daemon_user *)arg;
2273
2274                 mutex_lock(&ipvs->sync_mutex);
2275                 if (cmd == IP_VS_SO_SET_STARTDAEMON)
2276                         ret = start_sync_thread(net, dm->state, dm->mcast_ifn,
2277                                                 dm->syncid);
2278                 else
2279                         ret = stop_sync_thread(net, dm->state);
2280                 mutex_unlock(&ipvs->sync_mutex);
2281                 goto out_dec;
2282         }
2283
2284         mutex_lock(&__ip_vs_mutex);
2285         if (cmd == IP_VS_SO_SET_FLUSH) {
2286                 /* Flush the virtual service */
2287                 ret = ip_vs_flush(net, false);
2288                 goto out_unlock;
2289         } else if (cmd == IP_VS_SO_SET_TIMEOUT) {
2290                 /* Set timeout values for (tcp tcpfin udp) */
2291                 ret = ip_vs_set_timeout(net, (struct ip_vs_timeout_user *)arg);
2292                 goto out_unlock;
2293         }
2294
2295         usvc_compat = (struct ip_vs_service_user *)arg;
2296         udest_compat = (struct ip_vs_dest_user *)(usvc_compat + 1);
2297
2298         /* We only use the new structs internally, so copy userspace compat
2299          * structs to extended internal versions */
2300         ip_vs_copy_usvc_compat(&usvc, usvc_compat);
2301         ip_vs_copy_udest_compat(&udest, udest_compat);
2302
2303         if (cmd == IP_VS_SO_SET_ZERO) {
2304                 /* if no service address is set, zero counters in all */
2305                 if (!usvc.fwmark && !usvc.addr.ip && !usvc.port) {
2306                         ret = ip_vs_zero_all(net);
2307                         goto out_unlock;
2308                 }
2309         }
2310
2311         /* Check for valid protocol: TCP or UDP or SCTP, even for fwmark!=0 */
2312         if (usvc.protocol != IPPROTO_TCP && usvc.protocol != IPPROTO_UDP &&
2313             usvc.protocol != IPPROTO_SCTP) {
2314                 pr_err("set_ctl: invalid protocol: %d %pI4:%d %s\n",
2315                        usvc.protocol, &usvc.addr.ip,
2316                        ntohs(usvc.port), usvc.sched_name);
2317                 ret = -EFAULT;
2318                 goto out_unlock;
2319         }
2320
2321         /* Lookup the exact service by <protocol, addr, port> or fwmark */
2322         rcu_read_lock();
2323         if (usvc.fwmark == 0)
2324                 svc = __ip_vs_service_find(net, usvc.af, usvc.protocol,
2325                                            &usvc.addr, usvc.port);
2326         else
2327                 svc = __ip_vs_svc_fwm_find(net, usvc.af, usvc.fwmark);
2328         rcu_read_unlock();
2329
2330         if (cmd != IP_VS_SO_SET_ADD
2331             && (svc == NULL || svc->protocol != usvc.protocol)) {
2332                 ret = -ESRCH;
2333                 goto out_unlock;
2334         }
2335
2336         switch (cmd) {
2337         case IP_VS_SO_SET_ADD:
2338                 if (svc != NULL)
2339                         ret = -EEXIST;
2340                 else
2341                         ret = ip_vs_add_service(net, &usvc, &svc);
2342                 break;
2343         case IP_VS_SO_SET_EDIT:
2344                 ret = ip_vs_edit_service(svc, &usvc);
2345                 break;
2346         case IP_VS_SO_SET_DEL:
2347                 ret = ip_vs_del_service(svc);
2348                 if (!ret)
2349                         goto out_unlock;
2350                 break;
2351         case IP_VS_SO_SET_ZERO:
2352                 ret = ip_vs_zero_service(svc);
2353                 break;
2354         case IP_VS_SO_SET_ADDDEST:
2355                 ret = ip_vs_add_dest(svc, &udest);
2356                 break;
2357         case IP_VS_SO_SET_EDITDEST:
2358                 ret = ip_vs_edit_dest(svc, &udest);
2359                 break;
2360         case IP_VS_SO_SET_DELDEST:
2361                 ret = ip_vs_del_dest(svc, &udest);
2362                 break;
2363         default:
2364                 ret = -EINVAL;
2365         }
2366
2367   out_unlock:
2368         mutex_unlock(&__ip_vs_mutex);
2369   out_dec:
2370         /* decrease the module use count */
2371         ip_vs_use_count_dec();
2372
2373         return ret;
2374 }
2375
2376
2377 static void
2378 ip_vs_copy_service(struct ip_vs_service_entry *dst, struct ip_vs_service *src)
2379 {
2380         struct ip_vs_scheduler *sched;
2381
2382         sched = rcu_dereference_protected(src->scheduler, 1);
2383         dst->protocol = src->protocol;
2384         dst->addr = src->addr.ip;
2385         dst->port = src->port;
2386         dst->fwmark = src->fwmark;
2387         strlcpy(dst->sched_name, sched->name, sizeof(dst->sched_name));
2388         dst->flags = src->flags;
2389         dst->timeout = src->timeout / HZ;
2390         dst->netmask = src->netmask;
2391         dst->num_dests = src->num_dests;
2392         ip_vs_copy_stats(&dst->stats, &src->stats);
2393 }
2394
2395 static inline int
2396 __ip_vs_get_service_entries(struct net *net,
2397                             const struct ip_vs_get_services *get,
2398                             struct ip_vs_get_services __user *uptr)
2399 {
2400         int idx, count=0;
2401         struct ip_vs_service *svc;
2402         struct ip_vs_service_entry entry;
2403         int ret = 0;
2404
2405         for (idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
2406                 hlist_for_each_entry(svc, &ip_vs_svc_table[idx], s_list) {
2407                         /* Only expose IPv4 entries to old interface */
2408                         if (svc->af != AF_INET || !net_eq(svc->net, net))
2409                                 continue;
2410
2411                         if (count >= get->num_services)
2412                                 goto out;
2413                         memset(&entry, 0, sizeof(entry));
2414                         ip_vs_copy_service(&entry, svc);
2415                         if (copy_to_user(&uptr->entrytable[count],
2416                                          &entry, sizeof(entry))) {
2417                                 ret = -EFAULT;
2418                                 goto out;
2419                         }
2420                         count++;
2421                 }
2422         }
2423
2424         for (idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
2425                 hlist_for_each_entry(svc, &ip_vs_svc_fwm_table[idx], f_list) {
2426                         /* Only expose IPv4 entries to old interface */
2427                         if (svc->af != AF_INET || !net_eq(svc->net, net))
2428                                 continue;
2429
2430                         if (count >= get->num_services)
2431                                 goto out;
2432                         memset(&entry, 0, sizeof(entry));
2433                         ip_vs_copy_service(&entry, svc);
2434                         if (copy_to_user(&uptr->entrytable[count],
2435                                          &entry, sizeof(entry))) {
2436                                 ret = -EFAULT;
2437                                 goto out;
2438                         }
2439                         count++;
2440                 }
2441         }
2442 out:
2443         return ret;
2444 }
2445
2446 static inline int
2447 __ip_vs_get_dest_entries(struct net *net, const struct ip_vs_get_dests *get,
2448                          struct ip_vs_get_dests __user *uptr)
2449 {
2450         struct ip_vs_service *svc;
2451         union nf_inet_addr addr = { .ip = get->addr };
2452         int ret = 0;
2453
2454         rcu_read_lock();
2455         if (get->fwmark)
2456                 svc = __ip_vs_svc_fwm_find(net, AF_INET, get->fwmark);
2457         else
2458                 svc = __ip_vs_service_find(net, AF_INET, get->protocol, &addr,
2459                                            get->port);
2460         rcu_read_unlock();
2461
2462         if (svc) {
2463                 int count = 0;
2464                 struct ip_vs_dest *dest;
2465                 struct ip_vs_dest_entry entry;
2466
2467                 memset(&entry, 0, sizeof(entry));
2468                 list_for_each_entry(dest, &svc->destinations, n_list) {
2469                         if (count >= get->num_dests)
2470                                 break;
2471
2472                         entry.addr = dest->addr.ip;
2473                         entry.port = dest->port;
2474                         entry.conn_flags = atomic_read(&dest->conn_flags);
2475                         entry.weight = atomic_read(&dest->weight);
2476                         entry.u_threshold = dest->u_threshold;
2477                         entry.l_threshold = dest->l_threshold;
2478                         entry.activeconns = atomic_read(&dest->activeconns);
2479                         entry.inactconns = atomic_read(&dest->inactconns);
2480                         entry.persistconns = atomic_read(&dest->persistconns);
2481                         ip_vs_copy_stats(&entry.stats, &dest->stats);
2482                         if (copy_to_user(&uptr->entrytable[count],
2483                                          &entry, sizeof(entry))) {
2484                                 ret = -EFAULT;
2485                                 break;
2486                         }
2487                         count++;
2488                 }
2489         } else
2490                 ret = -ESRCH;
2491         return ret;
2492 }
2493
2494 static inline void
2495 __ip_vs_get_timeouts(struct net *net, struct ip_vs_timeout_user *u)
2496 {
2497 #if defined(CONFIG_IP_VS_PROTO_TCP) || defined(CONFIG_IP_VS_PROTO_UDP)
2498         struct ip_vs_proto_data *pd;
2499 #endif
2500
2501         memset(u, 0, sizeof (*u));
2502
2503 #ifdef CONFIG_IP_VS_PROTO_TCP
2504         pd = ip_vs_proto_data_get(net, IPPROTO_TCP);
2505         u->tcp_timeout = pd->timeout_table[IP_VS_TCP_S_ESTABLISHED] / HZ;
2506         u->tcp_fin_timeout = pd->timeout_table[IP_VS_TCP_S_FIN_WAIT] / HZ;
2507 #endif
2508 #ifdef CONFIG_IP_VS_PROTO_UDP
2509         pd = ip_vs_proto_data_get(net, IPPROTO_UDP);
2510         u->udp_timeout =
2511                         pd->timeout_table[IP_VS_UDP_S_NORMAL] / HZ;
2512 #endif
2513 }
2514
2515
2516 #define GET_CMDID(cmd)          (cmd - IP_VS_BASE_CTL)
2517 #define GET_INFO_ARG_LEN        (sizeof(struct ip_vs_getinfo))
2518 #define GET_SERVICES_ARG_LEN    (sizeof(struct ip_vs_get_services))
2519 #define GET_SERVICE_ARG_LEN     (sizeof(struct ip_vs_service_entry))
2520 #define GET_DESTS_ARG_LEN       (sizeof(struct ip_vs_get_dests))
2521 #define GET_TIMEOUT_ARG_LEN     (sizeof(struct ip_vs_timeout_user))
2522 #define GET_DAEMON_ARG_LEN      (sizeof(struct ip_vs_daemon_user) * 2)
2523
2524 static const unsigned char get_arglen[GET_CMDID(IP_VS_SO_GET_MAX)+1] = {
2525         [GET_CMDID(IP_VS_SO_GET_VERSION)]       = 64,
2526         [GET_CMDID(IP_VS_SO_GET_INFO)]          = GET_INFO_ARG_LEN,
2527         [GET_CMDID(IP_VS_SO_GET_SERVICES)]      = GET_SERVICES_ARG_LEN,
2528         [GET_CMDID(IP_VS_SO_GET_SERVICE)]       = GET_SERVICE_ARG_LEN,
2529         [GET_CMDID(IP_VS_SO_GET_DESTS)]         = GET_DESTS_ARG_LEN,
2530         [GET_CMDID(IP_VS_SO_GET_TIMEOUT)]       = GET_TIMEOUT_ARG_LEN,
2531         [GET_CMDID(IP_VS_SO_GET_DAEMON)]        = GET_DAEMON_ARG_LEN,
2532 };
2533
2534 static int
2535 do_ip_vs_get_ctl(struct sock *sk, int cmd, void __user *user, int *len)
2536 {
2537         unsigned char arg[128];
2538         int ret = 0;
2539         unsigned int copylen;
2540         struct net *net = sock_net(sk);
2541         struct netns_ipvs *ipvs = net_ipvs(net);
2542
2543         BUG_ON(!net);
2544         if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
2545                 return -EPERM;
2546
2547         if (cmd < IP_VS_BASE_CTL || cmd > IP_VS_SO_GET_MAX)
2548                 return -EINVAL;
2549
2550         if (*len < get_arglen[GET_CMDID(cmd)]) {
2551                 pr_err("get_ctl: len %u < %u\n",
2552                        *len, get_arglen[GET_CMDID(cmd)]);
2553                 return -EINVAL;
2554         }
2555
2556         copylen = get_arglen[GET_CMDID(cmd)];
2557         if (copylen > 128)
2558                 return -EINVAL;
2559
2560         if (copy_from_user(arg, user, copylen) != 0)
2561                 return -EFAULT;
2562         /*
2563          * Handle daemons first since it has its own locking
2564          */
2565         if (cmd == IP_VS_SO_GET_DAEMON) {
2566                 struct ip_vs_daemon_user d[2];
2567
2568                 memset(&d, 0, sizeof(d));
2569                 mutex_lock(&ipvs->sync_mutex);
2570                 if (ipvs->sync_state & IP_VS_STATE_MASTER) {
2571                         d[0].state = IP_VS_STATE_MASTER;
2572                         strlcpy(d[0].mcast_ifn, ipvs->master_mcast_ifn,
2573                                 sizeof(d[0].mcast_ifn));
2574                         d[0].syncid = ipvs->master_syncid;
2575                 }
2576                 if (ipvs->sync_state & IP_VS_STATE_BACKUP) {
2577                         d[1].state = IP_VS_STATE_BACKUP;
2578                         strlcpy(d[1].mcast_ifn, ipvs->backup_mcast_ifn,
2579                                 sizeof(d[1].mcast_ifn));
2580                         d[1].syncid = ipvs->backup_syncid;
2581                 }
2582                 if (copy_to_user(user, &d, sizeof(d)) != 0)
2583                         ret = -EFAULT;
2584                 mutex_unlock(&ipvs->sync_mutex);
2585                 return ret;
2586         }
2587
2588         mutex_lock(&__ip_vs_mutex);
2589         switch (cmd) {
2590         case IP_VS_SO_GET_VERSION:
2591         {
2592                 char buf[64];
2593
2594                 sprintf(buf, "IP Virtual Server version %d.%d.%d (size=%d)",
2595                         NVERSION(IP_VS_VERSION_CODE), ip_vs_conn_tab_size);
2596                 if (copy_to_user(user, buf, strlen(buf)+1) != 0) {
2597                         ret = -EFAULT;
2598                         goto out;
2599                 }
2600                 *len = strlen(buf)+1;
2601         }
2602         break;
2603
2604         case IP_VS_SO_GET_INFO:
2605         {
2606                 struct ip_vs_getinfo info;
2607                 info.version = IP_VS_VERSION_CODE;
2608                 info.size = ip_vs_conn_tab_size;
2609                 info.num_services = ipvs->num_services;
2610                 if (copy_to_user(user, &info, sizeof(info)) != 0)
2611                         ret = -EFAULT;
2612         }
2613         break;
2614
2615         case IP_VS_SO_GET_SERVICES:
2616         {
2617                 struct ip_vs_get_services *get;
2618                 int size;
2619
2620                 get = (struct ip_vs_get_services *)arg;
2621                 size = sizeof(*get) +
2622                         sizeof(struct ip_vs_service_entry) * get->num_services;
2623                 if (*len != size) {
2624                         pr_err("length: %u != %u\n", *len, size);
2625                         ret = -EINVAL;
2626                         goto out;
2627                 }
2628                 ret = __ip_vs_get_service_entries(net, get, user);
2629         }
2630         break;
2631
2632         case IP_VS_SO_GET_SERVICE:
2633         {
2634                 struct ip_vs_service_entry *entry;
2635                 struct ip_vs_service *svc;
2636                 union nf_inet_addr addr;
2637
2638                 entry = (struct ip_vs_service_entry *)arg;
2639                 addr.ip = entry->addr;
2640                 rcu_read_lock();
2641                 if (entry->fwmark)
2642                         svc = __ip_vs_svc_fwm_find(net, AF_INET, entry->fwmark);
2643                 else
2644                         svc = __ip_vs_service_find(net, AF_INET,
2645                                                    entry->protocol, &addr,
2646                                                    entry->port);
2647                 rcu_read_unlock();
2648                 if (svc) {
2649                         ip_vs_copy_service(entry, svc);
2650                         if (copy_to_user(user, entry, sizeof(*entry)) != 0)
2651                                 ret = -EFAULT;
2652                 } else
2653                         ret = -ESRCH;
2654         }
2655         break;
2656
2657         case IP_VS_SO_GET_DESTS:
2658         {
2659                 struct ip_vs_get_dests *get;
2660                 int size;
2661
2662                 get = (struct ip_vs_get_dests *)arg;
2663                 size = sizeof(*get) +
2664                         sizeof(struct ip_vs_dest_entry) * get->num_dests;
2665                 if (*len != size) {
2666                         pr_err("length: %u != %u\n", *len, size);
2667                         ret = -EINVAL;
2668                         goto out;
2669                 }
2670                 ret = __ip_vs_get_dest_entries(net, get, user);
2671         }
2672         break;
2673
2674         case IP_VS_SO_GET_TIMEOUT:
2675         {
2676                 struct ip_vs_timeout_user t;
2677
2678                 __ip_vs_get_timeouts(net, &t);
2679                 if (copy_to_user(user, &t, sizeof(t)) != 0)
2680                         ret = -EFAULT;
2681         }
2682         break;
2683
2684         default:
2685                 ret = -EINVAL;
2686         }
2687
2688 out:
2689         mutex_unlock(&__ip_vs_mutex);
2690         return ret;
2691 }
2692
2693
2694 static struct nf_sockopt_ops ip_vs_sockopts = {
2695         .pf             = PF_INET,
2696         .set_optmin     = IP_VS_BASE_CTL,
2697         .set_optmax     = IP_VS_SO_SET_MAX+1,
2698         .set            = do_ip_vs_set_ctl,
2699         .get_optmin     = IP_VS_BASE_CTL,
2700         .get_optmax     = IP_VS_SO_GET_MAX+1,
2701         .get            = do_ip_vs_get_ctl,
2702         .owner          = THIS_MODULE,
2703 };
2704
2705 /*
2706  * Generic Netlink interface
2707  */
2708
2709 /* IPVS genetlink family */
2710 static struct genl_family ip_vs_genl_family = {
2711         .id             = GENL_ID_GENERATE,
2712         .hdrsize        = 0,
2713         .name           = IPVS_GENL_NAME,
2714         .version        = IPVS_GENL_VERSION,
2715         .maxattr        = IPVS_CMD_MAX,
2716         .netnsok        = true,         /* Make ipvsadm to work on netns */
2717 };
2718
2719 /* Policy used for first-level command attributes */
2720 static const struct nla_policy ip_vs_cmd_policy[IPVS_CMD_ATTR_MAX + 1] = {
2721         [IPVS_CMD_ATTR_SERVICE]         = { .type = NLA_NESTED },
2722         [IPVS_CMD_ATTR_DEST]            = { .type = NLA_NESTED },
2723         [IPVS_CMD_ATTR_DAEMON]          = { .type = NLA_NESTED },
2724         [IPVS_CMD_ATTR_TIMEOUT_TCP]     = { .type = NLA_U32 },
2725         [IPVS_CMD_ATTR_TIMEOUT_TCP_FIN] = { .type = NLA_U32 },
2726         [IPVS_CMD_ATTR_TIMEOUT_UDP]     = { .type = NLA_U32 },
2727 };
2728
2729 /* Policy used for attributes in nested attribute IPVS_CMD_ATTR_DAEMON */
2730 static const struct nla_policy ip_vs_daemon_policy[IPVS_DAEMON_ATTR_MAX + 1] = {
2731         [IPVS_DAEMON_ATTR_STATE]        = { .type = NLA_U32 },
2732         [IPVS_DAEMON_ATTR_MCAST_IFN]    = { .type = NLA_NUL_STRING,
2733                                             .len = IP_VS_IFNAME_MAXLEN },
2734         [IPVS_DAEMON_ATTR_SYNC_ID]      = { .type = NLA_U32 },
2735 };
2736
2737 /* Policy used for attributes in nested attribute IPVS_CMD_ATTR_SERVICE */
2738 static const struct nla_policy ip_vs_svc_policy[IPVS_SVC_ATTR_MAX + 1] = {
2739         [IPVS_SVC_ATTR_AF]              = { .type = NLA_U16 },
2740         [IPVS_SVC_ATTR_PROTOCOL]        = { .type = NLA_U16 },
2741         [IPVS_SVC_ATTR_ADDR]            = { .type = NLA_BINARY,
2742                                             .len = sizeof(union nf_inet_addr) },
2743         [IPVS_SVC_ATTR_PORT]            = { .type = NLA_U16 },
2744         [IPVS_SVC_ATTR_FWMARK]          = { .type = NLA_U32 },
2745         [IPVS_SVC_ATTR_SCHED_NAME]      = { .type = NLA_NUL_STRING,
2746                                             .len = IP_VS_SCHEDNAME_MAXLEN },
2747         [IPVS_SVC_ATTR_PE_NAME]         = { .type = NLA_NUL_STRING,
2748                                             .len = IP_VS_PENAME_MAXLEN },
2749         [IPVS_SVC_ATTR_FLAGS]           = { .type = NLA_BINARY,
2750                                             .len = sizeof(struct ip_vs_flags) },
2751         [IPVS_SVC_ATTR_TIMEOUT]         = { .type = NLA_U32 },
2752         [IPVS_SVC_ATTR_NETMASK]         = { .type = NLA_U32 },
2753         [IPVS_SVC_ATTR_STATS]           = { .type = NLA_NESTED },
2754 };
2755
2756 /* Policy used for attributes in nested attribute IPVS_CMD_ATTR_DEST */
2757 static const struct nla_policy ip_vs_dest_policy[IPVS_DEST_ATTR_MAX + 1] = {
2758         [IPVS_DEST_ATTR_ADDR]           = { .type = NLA_BINARY,
2759                                             .len = sizeof(union nf_inet_addr) },
2760         [IPVS_DEST_ATTR_PORT]           = { .type = NLA_U16 },
2761         [IPVS_DEST_ATTR_FWD_METHOD]     = { .type = NLA_U32 },
2762         [IPVS_DEST_ATTR_WEIGHT]         = { .type = NLA_U32 },
2763         [IPVS_DEST_ATTR_U_THRESH]       = { .type = NLA_U32 },
2764         [IPVS_DEST_ATTR_L_THRESH]       = { .type = NLA_U32 },
2765         [IPVS_DEST_ATTR_ACTIVE_CONNS]   = { .type = NLA_U32 },
2766         [IPVS_DEST_ATTR_INACT_CONNS]    = { .type = NLA_U32 },
2767         [IPVS_DEST_ATTR_PERSIST_CONNS]  = { .type = NLA_U32 },
2768         [IPVS_DEST_ATTR_STATS]          = { .type = NLA_NESTED },
2769 };
2770
2771 static int ip_vs_genl_fill_stats(struct sk_buff *skb, int container_type,
2772                                  struct ip_vs_stats *stats)
2773 {
2774         struct ip_vs_stats_user ustats;
2775         struct nlattr *nl_stats = nla_nest_start(skb, container_type);
2776         if (!nl_stats)
2777                 return -EMSGSIZE;
2778
2779         ip_vs_copy_stats(&ustats, stats);
2780
2781         if (nla_put_u32(skb, IPVS_STATS_ATTR_CONNS, ustats.conns) ||
2782             nla_put_u32(skb, IPVS_STATS_ATTR_INPKTS, ustats.inpkts) ||
2783             nla_put_u32(skb, IPVS_STATS_ATTR_OUTPKTS, ustats.outpkts) ||
2784             nla_put_u64(skb, IPVS_STATS_ATTR_INBYTES, ustats.inbytes) ||
2785             nla_put_u64(skb, IPVS_STATS_ATTR_OUTBYTES, ustats.outbytes) ||
2786             nla_put_u32(skb, IPVS_STATS_ATTR_CPS, ustats.cps) ||
2787             nla_put_u32(skb, IPVS_STATS_ATTR_INPPS, ustats.inpps) ||
2788             nla_put_u32(skb, IPVS_STATS_ATTR_OUTPPS, ustats.outpps) ||
2789             nla_put_u32(skb, IPVS_STATS_ATTR_INBPS, ustats.inbps) ||
2790             nla_put_u32(skb, IPVS_STATS_ATTR_OUTBPS, ustats.outbps))
2791                 goto nla_put_failure;
2792         nla_nest_end(skb, nl_stats);
2793
2794         return 0;
2795
2796 nla_put_failure:
2797         nla_nest_cancel(skb, nl_stats);
2798         return -EMSGSIZE;
2799 }
2800
2801 static int ip_vs_genl_fill_service(struct sk_buff *skb,
2802                                    struct ip_vs_service *svc)
2803 {
2804         struct ip_vs_scheduler *sched;
2805         struct ip_vs_pe *pe;
2806         struct nlattr *nl_service;
2807         struct ip_vs_flags flags = { .flags = svc->flags,
2808                                      .mask = ~0 };
2809
2810         nl_service = nla_nest_start(skb, IPVS_CMD_ATTR_SERVICE);
2811         if (!nl_service)
2812                 return -EMSGSIZE;
2813
2814         if (nla_put_u16(skb, IPVS_SVC_ATTR_AF, svc->af))
2815                 goto nla_put_failure;
2816         if (svc->fwmark) {
2817                 if (nla_put_u32(skb, IPVS_SVC_ATTR_FWMARK, svc->fwmark))
2818                         goto nla_put_failure;
2819         } else {
2820                 if (nla_put_u16(skb, IPVS_SVC_ATTR_PROTOCOL, svc->protocol) ||
2821                     nla_put(skb, IPVS_SVC_ATTR_ADDR, sizeof(svc->addr), &svc->addr) ||
2822                     nla_put_be16(skb, IPVS_SVC_ATTR_PORT, svc->port))
2823                         goto nla_put_failure;
2824         }
2825
2826         sched = rcu_dereference_protected(svc->scheduler, 1);
2827         pe = rcu_dereference_protected(svc->pe, 1);
2828         if (nla_put_string(skb, IPVS_SVC_ATTR_SCHED_NAME, sched->name) ||
2829             (pe && nla_put_string(skb, IPVS_SVC_ATTR_PE_NAME, pe->name)) ||
2830             nla_put(skb, IPVS_SVC_ATTR_FLAGS, sizeof(flags), &flags) ||
2831             nla_put_u32(skb, IPVS_SVC_ATTR_TIMEOUT, svc->timeout / HZ) ||
2832             nla_put_be32(skb, IPVS_SVC_ATTR_NETMASK, svc->netmask))
2833                 goto nla_put_failure;
2834         if (ip_vs_genl_fill_stats(skb, IPVS_SVC_ATTR_STATS, &svc->stats))
2835                 goto nla_put_failure;
2836
2837         nla_nest_end(skb, nl_service);
2838
2839         return 0;
2840
2841 nla_put_failure:
2842         nla_nest_cancel(skb, nl_service);
2843         return -EMSGSIZE;
2844 }
2845
2846 static int ip_vs_genl_dump_service(struct sk_buff *skb,
2847                                    struct ip_vs_service *svc,
2848                                    struct netlink_callback *cb)
2849 {
2850         void *hdr;
2851
2852         hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
2853                           &ip_vs_genl_family, NLM_F_MULTI,
2854                           IPVS_CMD_NEW_SERVICE);
2855         if (!hdr)
2856                 return -EMSGSIZE;
2857
2858         if (ip_vs_genl_fill_service(skb, svc) < 0)
2859                 goto nla_put_failure;
2860
2861         return genlmsg_end(skb, hdr);
2862
2863 nla_put_failure:
2864         genlmsg_cancel(skb, hdr);
2865         return -EMSGSIZE;
2866 }
2867
2868 static int ip_vs_genl_dump_services(struct sk_buff *skb,
2869                                     struct netlink_callback *cb)
2870 {
2871         int idx = 0, i;
2872         int start = cb->args[0];
2873         struct ip_vs_service *svc;
2874         struct net *net = skb_sknet(skb);
2875
2876         mutex_lock(&__ip_vs_mutex);
2877         for (i = 0; i < IP_VS_SVC_TAB_SIZE; i++) {
2878                 hlist_for_each_entry(svc, &ip_vs_svc_table[i], s_list) {
2879                         if (++idx <= start || !net_eq(svc->net, net))
2880                                 continue;
2881                         if (ip_vs_genl_dump_service(skb, svc, cb) < 0) {
2882                                 idx--;
2883                                 goto nla_put_failure;
2884                         }
2885                 }
2886         }
2887
2888         for (i = 0; i < IP_VS_SVC_TAB_SIZE; i++) {
2889                 hlist_for_each_entry(svc, &ip_vs_svc_fwm_table[i], f_list) {
2890                         if (++idx <= start || !net_eq(svc->net, net))
2891                                 continue;
2892                         if (ip_vs_genl_dump_service(skb, svc, cb) < 0) {
2893                                 idx--;
2894                                 goto nla_put_failure;
2895                         }
2896                 }
2897         }
2898
2899 nla_put_failure:
2900         mutex_unlock(&__ip_vs_mutex);
2901         cb->args[0] = idx;
2902
2903         return skb->len;
2904 }
2905
2906 static int ip_vs_genl_parse_service(struct net *net,
2907                                     struct ip_vs_service_user_kern *usvc,
2908                                     struct nlattr *nla, int full_entry,
2909                                     struct ip_vs_service **ret_svc)
2910 {
2911         struct nlattr *attrs[IPVS_SVC_ATTR_MAX + 1];
2912         struct nlattr *nla_af, *nla_port, *nla_fwmark, *nla_protocol, *nla_addr;
2913         struct ip_vs_service *svc;
2914
2915         /* Parse mandatory identifying service fields first */
2916         if (nla == NULL ||
2917             nla_parse_nested(attrs, IPVS_SVC_ATTR_MAX, nla, ip_vs_svc_policy))
2918                 return -EINVAL;
2919
2920         nla_af          = attrs[IPVS_SVC_ATTR_AF];
2921         nla_protocol    = attrs[IPVS_SVC_ATTR_PROTOCOL];
2922         nla_addr        = attrs[IPVS_SVC_ATTR_ADDR];
2923         nla_port        = attrs[IPVS_SVC_ATTR_PORT];
2924         nla_fwmark      = attrs[IPVS_SVC_ATTR_FWMARK];
2925
2926         if (!(nla_af && (nla_fwmark || (nla_port && nla_protocol && nla_addr))))
2927                 return -EINVAL;
2928
2929         memset(usvc, 0, sizeof(*usvc));
2930
2931         usvc->af = nla_get_u16(nla_af);
2932 #ifdef CONFIG_IP_VS_IPV6
2933         if (usvc->af != AF_INET && usvc->af != AF_INET6)
2934 #else
2935         if (usvc->af != AF_INET)
2936 #endif
2937                 return -EAFNOSUPPORT;
2938
2939         if (nla_fwmark) {
2940                 usvc->protocol = IPPROTO_TCP;
2941                 usvc->fwmark = nla_get_u32(nla_fwmark);
2942         } else {
2943                 usvc->protocol = nla_get_u16(nla_protocol);
2944                 nla_memcpy(&usvc->addr, nla_addr, sizeof(usvc->addr));
2945                 usvc->port = nla_get_be16(nla_port);
2946                 usvc->fwmark = 0;
2947         }
2948
2949         rcu_read_lock();
2950         if (usvc->fwmark)
2951                 svc = __ip_vs_svc_fwm_find(net, usvc->af, usvc->fwmark);
2952         else
2953                 svc = __ip_vs_service_find(net, usvc->af, usvc->protocol,
2954                                            &usvc->addr, usvc->port);
2955         rcu_read_unlock();
2956         *ret_svc = svc;
2957
2958         /* If a full entry was requested, check for the additional fields */
2959         if (full_entry) {
2960                 struct nlattr *nla_sched, *nla_flags, *nla_pe, *nla_timeout,
2961                               *nla_netmask;
2962                 struct ip_vs_flags flags;
2963
2964                 nla_sched = attrs[IPVS_SVC_ATTR_SCHED_NAME];
2965                 nla_pe = attrs[IPVS_SVC_ATTR_PE_NAME];
2966                 nla_flags = attrs[IPVS_SVC_ATTR_FLAGS];
2967                 nla_timeout = attrs[IPVS_SVC_ATTR_TIMEOUT];
2968                 nla_netmask = attrs[IPVS_SVC_ATTR_NETMASK];
2969
2970                 if (!(nla_sched && nla_flags && nla_timeout && nla_netmask))
2971                         return -EINVAL;
2972
2973                 nla_memcpy(&flags, nla_flags, sizeof(flags));
2974
2975                 /* prefill flags from service if it already exists */
2976                 if (svc)
2977                         usvc->flags = svc->flags;
2978
2979                 /* set new flags from userland */
2980                 usvc->flags = (usvc->flags & ~flags.mask) |
2981                               (flags.flags & flags.mask);
2982                 usvc->sched_name = nla_data(nla_sched);
2983                 usvc->pe_name = nla_pe ? nla_data(nla_pe) : NULL;
2984                 usvc->timeout = nla_get_u32(nla_timeout);
2985                 usvc->netmask = nla_get_be32(nla_netmask);
2986         }
2987
2988         return 0;
2989 }
2990
2991 static struct ip_vs_service *ip_vs_genl_find_service(struct net *net,
2992                                                      struct nlattr *nla)
2993 {
2994         struct ip_vs_service_user_kern usvc;
2995         struct ip_vs_service *svc;
2996         int ret;
2997
2998         ret = ip_vs_genl_parse_service(net, &usvc, nla, 0, &svc);
2999         return ret ? ERR_PTR(ret) : svc;
3000 }
3001
3002 static int ip_vs_genl_fill_dest(struct sk_buff *skb, struct ip_vs_dest *dest)
3003 {
3004         struct nlattr *nl_dest;
3005
3006         nl_dest = nla_nest_start(skb, IPVS_CMD_ATTR_DEST);
3007         if (!nl_dest)
3008                 return -EMSGSIZE;
3009
3010         if (nla_put(skb, IPVS_DEST_ATTR_ADDR, sizeof(dest->addr), &dest->addr) ||
3011             nla_put_be16(skb, IPVS_DEST_ATTR_PORT, dest->port) ||
3012             nla_put_u32(skb, IPVS_DEST_ATTR_FWD_METHOD,
3013                         (atomic_read(&dest->conn_flags) &
3014                          IP_VS_CONN_F_FWD_MASK)) ||
3015             nla_put_u32(skb, IPVS_DEST_ATTR_WEIGHT,
3016                         atomic_read(&dest->weight)) ||
3017             nla_put_u32(skb, IPVS_DEST_ATTR_U_THRESH, dest->u_threshold) ||
3018             nla_put_u32(skb, IPVS_DEST_ATTR_L_THRESH, dest->l_threshold) ||
3019             nla_put_u32(skb, IPVS_DEST_ATTR_ACTIVE_CONNS,
3020                         atomic_read(&dest->activeconns)) ||
3021             nla_put_u32(skb, IPVS_DEST_ATTR_INACT_CONNS,
3022                         atomic_read(&dest->inactconns)) ||
3023             nla_put_u32(skb, IPVS_DEST_ATTR_PERSIST_CONNS,
3024                         atomic_read(&dest->persistconns)))
3025                 goto nla_put_failure;
3026         if (ip_vs_genl_fill_stats(skb, IPVS_DEST_ATTR_STATS, &dest->stats))
3027                 goto nla_put_failure;
3028
3029         nla_nest_end(skb, nl_dest);
3030
3031         return 0;
3032
3033 nla_put_failure:
3034         nla_nest_cancel(skb, nl_dest);
3035         return -EMSGSIZE;
3036 }
3037
3038 static int ip_vs_genl_dump_dest(struct sk_buff *skb, struct ip_vs_dest *dest,
3039                                 struct netlink_callback *cb)
3040 {
3041         void *hdr;
3042
3043         hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
3044                           &ip_vs_genl_family, NLM_F_MULTI,
3045                           IPVS_CMD_NEW_DEST);
3046         if (!hdr)
3047                 return -EMSGSIZE;
3048
3049         if (ip_vs_genl_fill_dest(skb, dest) < 0)
3050                 goto nla_put_failure;
3051
3052         return genlmsg_end(skb, hdr);
3053
3054 nla_put_failure:
3055         genlmsg_cancel(skb, hdr);
3056         return -EMSGSIZE;
3057 }
3058
3059 static int ip_vs_genl_dump_dests(struct sk_buff *skb,
3060                                  struct netlink_callback *cb)
3061 {
3062         int idx = 0;
3063         int start = cb->args[0];
3064         struct ip_vs_service *svc;
3065         struct ip_vs_dest *dest;
3066         struct nlattr *attrs[IPVS_CMD_ATTR_MAX + 1];
3067         struct net *net = skb_sknet(skb);
3068
3069         mutex_lock(&__ip_vs_mutex);
3070
3071         /* Try to find the service for which to dump destinations */
3072         if (nlmsg_parse(cb->nlh, GENL_HDRLEN, attrs,
3073                         IPVS_CMD_ATTR_MAX, ip_vs_cmd_policy))
3074                 goto out_err;
3075
3076
3077         svc = ip_vs_genl_find_service(net, attrs[IPVS_CMD_ATTR_SERVICE]);
3078         if (IS_ERR(svc) || svc == NULL)
3079                 goto out_err;
3080
3081         /* Dump the destinations */
3082         list_for_each_entry(dest, &svc->destinations, n_list) {
3083                 if (++idx <= start)
3084                         continue;
3085                 if (ip_vs_genl_dump_dest(skb, dest, cb) < 0) {
3086                         idx--;
3087                         goto nla_put_failure;
3088                 }
3089         }
3090
3091 nla_put_failure:
3092         cb->args[0] = idx;
3093
3094 out_err:
3095         mutex_unlock(&__ip_vs_mutex);
3096
3097         return skb->len;
3098 }
3099
3100 static int ip_vs_genl_parse_dest(struct ip_vs_dest_user_kern *udest,
3101                                  struct nlattr *nla, int full_entry)
3102 {
3103         struct nlattr *attrs[IPVS_DEST_ATTR_MAX + 1];
3104         struct nlattr *nla_addr, *nla_port;
3105
3106         /* Parse mandatory identifying destination fields first */
3107         if (nla == NULL ||
3108             nla_parse_nested(attrs, IPVS_DEST_ATTR_MAX, nla, ip_vs_dest_policy))
3109                 return -EINVAL;
3110
3111         nla_addr        = attrs[IPVS_DEST_ATTR_ADDR];
3112         nla_port        = attrs[IPVS_DEST_ATTR_PORT];
3113
3114         if (!(nla_addr && nla_port))
3115                 return -EINVAL;
3116
3117         memset(udest, 0, sizeof(*udest));
3118
3119         nla_memcpy(&udest->addr, nla_addr, sizeof(udest->addr));
3120         udest->port = nla_get_be16(nla_port);
3121
3122         /* If a full entry was requested, check for the additional fields */
3123         if (full_entry) {
3124                 struct nlattr *nla_fwd, *nla_weight, *nla_u_thresh,
3125                               *nla_l_thresh;
3126
3127                 nla_fwd         = attrs[IPVS_DEST_ATTR_FWD_METHOD];
3128                 nla_weight      = attrs[IPVS_DEST_ATTR_WEIGHT];
3129                 nla_u_thresh    = attrs[IPVS_DEST_ATTR_U_THRESH];
3130                 nla_l_thresh    = attrs[IPVS_DEST_ATTR_L_THRESH];
3131
3132                 if (!(nla_fwd && nla_weight && nla_u_thresh && nla_l_thresh))
3133                         return -EINVAL;
3134
3135                 udest->conn_flags = nla_get_u32(nla_fwd)
3136                                     & IP_VS_CONN_F_FWD_MASK;
3137                 udest->weight = nla_get_u32(nla_weight);
3138                 udest->u_threshold = nla_get_u32(nla_u_thresh);
3139                 udest->l_threshold = nla_get_u32(nla_l_thresh);
3140         }
3141
3142         return 0;
3143 }
3144
3145 static int ip_vs_genl_fill_daemon(struct sk_buff *skb, __u32 state,
3146                                   const char *mcast_ifn, __u32 syncid)
3147 {
3148         struct nlattr *nl_daemon;
3149
3150         nl_daemon = nla_nest_start(skb, IPVS_CMD_ATTR_DAEMON);
3151         if (!nl_daemon)
3152                 return -EMSGSIZE;
3153
3154         if (nla_put_u32(skb, IPVS_DAEMON_ATTR_STATE, state) ||
3155             nla_put_string(skb, IPVS_DAEMON_ATTR_MCAST_IFN, mcast_ifn) ||
3156             nla_put_u32(skb, IPVS_DAEMON_ATTR_SYNC_ID, syncid))
3157                 goto nla_put_failure;
3158         nla_nest_end(skb, nl_daemon);
3159
3160         return 0;
3161
3162 nla_put_failure:
3163         nla_nest_cancel(skb, nl_daemon);
3164         return -EMSGSIZE;
3165 }
3166
3167 static int ip_vs_genl_dump_daemon(struct sk_buff *skb, __u32 state,
3168                                   const char *mcast_ifn, __u32 syncid,
3169                                   struct netlink_callback *cb)
3170 {
3171         void *hdr;
3172         hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
3173                           &ip_vs_genl_family, NLM_F_MULTI,
3174                           IPVS_CMD_NEW_DAEMON);
3175         if (!hdr)
3176                 return -EMSGSIZE;
3177
3178         if (ip_vs_genl_fill_daemon(skb, state, mcast_ifn, syncid))
3179                 goto nla_put_failure;
3180
3181         return genlmsg_end(skb, hdr);
3182
3183 nla_put_failure:
3184         genlmsg_cancel(skb, hdr);
3185         return -EMSGSIZE;
3186 }
3187
3188 static int ip_vs_genl_dump_daemons(struct sk_buff *skb,
3189                                    struct netlink_callback *cb)
3190 {
3191         struct net *net = skb_sknet(skb);
3192         struct netns_ipvs *ipvs = net_ipvs(net);
3193
3194         mutex_lock(&ipvs->sync_mutex);
3195         if ((ipvs->sync_state & IP_VS_STATE_MASTER) && !cb->args[0]) {
3196                 if (ip_vs_genl_dump_daemon(skb, IP_VS_STATE_MASTER,
3197                                            ipvs->master_mcast_ifn,
3198                                            ipvs->master_syncid, cb) < 0)
3199                         goto nla_put_failure;
3200
3201                 cb->args[0] = 1;
3202         }
3203
3204         if ((ipvs->sync_state & IP_VS_STATE_BACKUP) && !cb->args[1]) {
3205                 if (ip_vs_genl_dump_daemon(skb, IP_VS_STATE_BACKUP,
3206                                            ipvs->backup_mcast_ifn,
3207                                            ipvs->backup_syncid, cb) < 0)
3208                         goto nla_put_failure;
3209
3210                 cb->args[1] = 1;
3211         }
3212
3213 nla_put_failure:
3214         mutex_unlock(&ipvs->sync_mutex);
3215
3216         return skb->len;
3217 }
3218
3219 static int ip_vs_genl_new_daemon(struct net *net, struct nlattr **attrs)
3220 {
3221         if (!(attrs[IPVS_DAEMON_ATTR_STATE] &&
3222               attrs[IPVS_DAEMON_ATTR_MCAST_IFN] &&
3223               attrs[IPVS_DAEMON_ATTR_SYNC_ID]))
3224                 return -EINVAL;
3225
3226         return start_sync_thread(net,
3227                                  nla_get_u32(attrs[IPVS_DAEMON_ATTR_STATE]),
3228                                  nla_data(attrs[IPVS_DAEMON_ATTR_MCAST_IFN]),
3229                                  nla_get_u32(attrs[IPVS_DAEMON_ATTR_SYNC_ID]));
3230 }
3231
3232 static int ip_vs_genl_del_daemon(struct net *net, struct nlattr **attrs)
3233 {
3234         if (!attrs[IPVS_DAEMON_ATTR_STATE])
3235                 return -EINVAL;
3236
3237         return stop_sync_thread(net,
3238                                 nla_get_u32(attrs[IPVS_DAEMON_ATTR_STATE]));
3239 }
3240
3241 static int ip_vs_genl_set_config(struct net *net, struct nlattr **attrs)
3242 {
3243         struct ip_vs_timeout_user t;
3244
3245         __ip_vs_get_timeouts(net, &t);
3246
3247         if (attrs[IPVS_CMD_ATTR_TIMEOUT_TCP])
3248                 t.tcp_timeout = nla_get_u32(attrs[IPVS_CMD_ATTR_TIMEOUT_TCP]);
3249
3250         if (attrs[IPVS_CMD_ATTR_TIMEOUT_TCP_FIN])
3251                 t.tcp_fin_timeout =
3252                         nla_get_u32(attrs[IPVS_CMD_ATTR_TIMEOUT_TCP_FIN]);
3253
3254         if (attrs[IPVS_CMD_ATTR_TIMEOUT_UDP])
3255                 t.udp_timeout = nla_get_u32(attrs[IPVS_CMD_ATTR_TIMEOUT_UDP]);
3256
3257         return ip_vs_set_timeout(net, &t);
3258 }
3259
3260 static int ip_vs_genl_set_daemon(struct sk_buff *skb, struct genl_info *info)
3261 {
3262         int ret = 0, cmd;
3263         struct net *net;
3264         struct netns_ipvs *ipvs;
3265
3266         net = skb_sknet(skb);
3267         ipvs = net_ipvs(net);
3268         cmd = info->genlhdr->cmd;
3269
3270         if (cmd == IPVS_CMD_NEW_DAEMON || cmd == IPVS_CMD_DEL_DAEMON) {
3271                 struct nlattr *daemon_attrs[IPVS_DAEMON_ATTR_MAX + 1];
3272
3273                 mutex_lock(&ipvs->sync_mutex);
3274                 if (!info->attrs[IPVS_CMD_ATTR_DAEMON] ||
3275                     nla_parse_nested(daemon_attrs, IPVS_DAEMON_ATTR_MAX,
3276                                      info->attrs[IPVS_CMD_ATTR_DAEMON],
3277                                      ip_vs_daemon_policy)) {
3278                         ret = -EINVAL;
3279                         goto out;
3280                 }
3281
3282                 if (cmd == IPVS_CMD_NEW_DAEMON)
3283                         ret = ip_vs_genl_new_daemon(net, daemon_attrs);
3284                 else
3285                         ret = ip_vs_genl_del_daemon(net, daemon_attrs);
3286 out:
3287                 mutex_unlock(&ipvs->sync_mutex);
3288         }
3289         return ret;
3290 }
3291
3292 static int ip_vs_genl_set_cmd(struct sk_buff *skb, struct genl_info *info)
3293 {
3294         struct ip_vs_service *svc = NULL;
3295         struct ip_vs_service_user_kern usvc;
3296         struct ip_vs_dest_user_kern udest;
3297         int ret = 0, cmd;
3298         int need_full_svc = 0, need_full_dest = 0;
3299         struct net *net;
3300
3301         net = skb_sknet(skb);
3302         cmd = info->genlhdr->cmd;
3303
3304         mutex_lock(&__ip_vs_mutex);
3305
3306         if (cmd == IPVS_CMD_FLUSH) {
3307                 ret = ip_vs_flush(net, false);
3308                 goto out;
3309         } else if (cmd == IPVS_CMD_SET_CONFIG) {
3310                 ret = ip_vs_genl_set_config(net, info->attrs);
3311                 goto out;
3312         } else if (cmd == IPVS_CMD_ZERO &&
3313                    !info->attrs[IPVS_CMD_ATTR_SERVICE]) {
3314                 ret = ip_vs_zero_all(net);
3315                 goto out;
3316         }
3317
3318         /* All following commands require a service argument, so check if we
3319          * received a valid one. We need a full service specification when
3320          * adding / editing a service. Only identifying members otherwise. */
3321         if (cmd == IPVS_CMD_NEW_SERVICE || cmd == IPVS_CMD_SET_SERVICE)
3322                 need_full_svc = 1;
3323
3324         ret = ip_vs_genl_parse_service(net, &usvc,
3325                                        info->attrs[IPVS_CMD_ATTR_SERVICE],
3326                                        need_full_svc, &svc);
3327         if (ret)
3328                 goto out;
3329
3330         /* Unless we're adding a new service, the service must already exist */
3331         if ((cmd != IPVS_CMD_NEW_SERVICE) && (svc == NULL)) {
3332                 ret = -ESRCH;
3333                 goto out;
3334         }
3335
3336         /* Destination commands require a valid destination argument. For
3337          * adding / editing a destination, we need a full destination
3338          * specification. */
3339         if (cmd == IPVS_CMD_NEW_DEST || cmd == IPVS_CMD_SET_DEST ||
3340             cmd == IPVS_CMD_DEL_DEST) {
3341                 if (cmd != IPVS_CMD_DEL_DEST)
3342                         need_full_dest = 1;
3343
3344                 ret = ip_vs_genl_parse_dest(&udest,
3345                                             info->attrs[IPVS_CMD_ATTR_DEST],
3346                                             need_full_dest);
3347                 if (ret)
3348                         goto out;
3349         }
3350
3351         switch (cmd) {
3352         case IPVS_CMD_NEW_SERVICE:
3353                 if (svc == NULL)
3354                         ret = ip_vs_add_service(net, &usvc, &svc);
3355                 else
3356                         ret = -EEXIST;
3357                 break;
3358         case IPVS_CMD_SET_SERVICE:
3359                 ret = ip_vs_edit_service(svc, &usvc);
3360                 break;
3361         case IPVS_CMD_DEL_SERVICE:
3362                 ret = ip_vs_del_service(svc);
3363                 /* do not use svc, it can be freed */
3364                 break;
3365         case IPVS_CMD_NEW_DEST:
3366                 ret = ip_vs_add_dest(svc, &udest);
3367                 break;
3368         case IPVS_CMD_SET_DEST:
3369                 ret = ip_vs_edit_dest(svc, &udest);
3370                 break;
3371         case IPVS_CMD_DEL_DEST:
3372                 ret = ip_vs_del_dest(svc, &udest);
3373                 break;
3374         case IPVS_CMD_ZERO:
3375                 ret = ip_vs_zero_service(svc);
3376                 break;
3377         default:
3378                 ret = -EINVAL;
3379         }
3380
3381 out:
3382         mutex_unlock(&__ip_vs_mutex);
3383
3384         return ret;
3385 }
3386
3387 static int ip_vs_genl_get_cmd(struct sk_buff *skb, struct genl_info *info)
3388 {
3389         struct sk_buff *msg;
3390         void *reply;
3391         int ret, cmd, reply_cmd;
3392         struct net *net;
3393
3394         net = skb_sknet(skb);
3395         cmd = info->genlhdr->cmd;
3396
3397         if (cmd == IPVS_CMD_GET_SERVICE)
3398                 reply_cmd = IPVS_CMD_NEW_SERVICE;
3399         else if (cmd == IPVS_CMD_GET_INFO)
3400                 reply_cmd = IPVS_CMD_SET_INFO;
3401         else if (cmd == IPVS_CMD_GET_CONFIG)
3402                 reply_cmd = IPVS_CMD_SET_CONFIG;
3403         else {
3404                 pr_err("unknown Generic Netlink command\n");
3405                 return -EINVAL;
3406         }
3407
3408         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
3409         if (!msg)
3410                 return -ENOMEM;
3411
3412         mutex_lock(&__ip_vs_mutex);
3413
3414         reply = genlmsg_put_reply(msg, info, &ip_vs_genl_family, 0, reply_cmd);
3415         if (reply == NULL)
3416                 goto nla_put_failure;
3417
3418         switch (cmd) {
3419         case IPVS_CMD_GET_SERVICE:
3420         {
3421                 struct ip_vs_service *svc;
3422
3423                 svc = ip_vs_genl_find_service(net,
3424                                               info->attrs[IPVS_CMD_ATTR_SERVICE]);
3425                 if (IS_ERR(svc)) {
3426                         ret = PTR_ERR(svc);
3427                         goto out_err;
3428                 } else if (svc) {
3429                         ret = ip_vs_genl_fill_service(msg, svc);
3430                         if (ret)
3431                                 goto nla_put_failure;
3432                 } else {
3433                         ret = -ESRCH;
3434                         goto out_err;
3435                 }
3436
3437                 break;
3438         }
3439
3440         case IPVS_CMD_GET_CONFIG:
3441         {
3442                 struct ip_vs_timeout_user t;
3443
3444                 __ip_vs_get_timeouts(net, &t);
3445 #ifdef CONFIG_IP_VS_PROTO_TCP
3446                 if (nla_put_u32(msg, IPVS_CMD_ATTR_TIMEOUT_TCP,
3447                                 t.tcp_timeout) ||
3448                     nla_put_u32(msg, IPVS_CMD_ATTR_TIMEOUT_TCP_FIN,
3449                                 t.tcp_fin_timeout))
3450                         goto nla_put_failure;
3451 #endif
3452 #ifdef CONFIG_IP_VS_PROTO_UDP
3453                 if (nla_put_u32(msg, IPVS_CMD_ATTR_TIMEOUT_UDP, t.udp_timeout))
3454                         goto nla_put_failure;
3455 #endif
3456
3457                 break;
3458         }
3459
3460         case IPVS_CMD_GET_INFO:
3461                 if (nla_put_u32(msg, IPVS_INFO_ATTR_VERSION,
3462                                 IP_VS_VERSION_CODE) ||
3463                     nla_put_u32(msg, IPVS_INFO_ATTR_CONN_TAB_SIZE,
3464                                 ip_vs_conn_tab_size))
3465                         goto nla_put_failure;
3466                 break;
3467         }
3468
3469         genlmsg_end(msg, reply);
3470         ret = genlmsg_reply(msg, info);
3471         goto out;
3472
3473 nla_put_failure:
3474         pr_err("not enough space in Netlink message\n");
3475         ret = -EMSGSIZE;
3476
3477 out_err:
3478         nlmsg_free(msg);
3479 out:
3480         mutex_unlock(&__ip_vs_mutex);
3481
3482         return ret;
3483 }
3484
3485
3486 static const struct genl_ops ip_vs_genl_ops[] = {
3487         {
3488                 .cmd    = IPVS_CMD_NEW_SERVICE,
3489                 .flags  = GENL_ADMIN_PERM,
3490                 .policy = ip_vs_cmd_policy,
3491                 .doit   = ip_vs_genl_set_cmd,
3492         },
3493         {
3494                 .cmd    = IPVS_CMD_SET_SERVICE,
3495                 .flags  = GENL_ADMIN_PERM,
3496                 .policy = ip_vs_cmd_policy,
3497                 .doit   = ip_vs_genl_set_cmd,
3498         },
3499         {
3500                 .cmd    = IPVS_CMD_DEL_SERVICE,
3501                 .flags  = GENL_ADMIN_PERM,
3502                 .policy = ip_vs_cmd_policy,
3503                 .doit   = ip_vs_genl_set_cmd,
3504         },
3505         {
3506                 .cmd    = IPVS_CMD_GET_SERVICE,
3507                 .flags  = GENL_ADMIN_PERM,
3508                 .doit   = ip_vs_genl_get_cmd,
3509                 .dumpit = ip_vs_genl_dump_services,
3510                 .policy = ip_vs_cmd_policy,
3511         },
3512         {
3513                 .cmd    = IPVS_CMD_NEW_DEST,
3514                 .flags  = GENL_ADMIN_PERM,
3515                 .policy = ip_vs_cmd_policy,
3516                 .doit   = ip_vs_genl_set_cmd,
3517         },
3518         {
3519                 .cmd    = IPVS_CMD_SET_DEST,
3520                 .flags  = GENL_ADMIN_PERM,
3521                 .policy = ip_vs_cmd_policy,
3522                 .doit   = ip_vs_genl_set_cmd,
3523         },
3524         {
3525                 .cmd    = IPVS_CMD_DEL_DEST,
3526                 .flags  = GENL_ADMIN_PERM,
3527                 .policy = ip_vs_cmd_policy,
3528                 .doit   = ip_vs_genl_set_cmd,
3529         },
3530         {
3531                 .cmd    = IPVS_CMD_GET_DEST,
3532                 .flags  = GENL_ADMIN_PERM,
3533                 .policy = ip_vs_cmd_policy,
3534                 .dumpit = ip_vs_genl_dump_dests,
3535         },
3536         {
3537                 .cmd    = IPVS_CMD_NEW_DAEMON,
3538                 .flags  = GENL_ADMIN_PERM,
3539                 .policy = ip_vs_cmd_policy,
3540                 .doit   = ip_vs_genl_set_daemon,
3541         },
3542         {
3543                 .cmd    = IPVS_CMD_DEL_DAEMON,
3544                 .flags  = GENL_ADMIN_PERM,
3545                 .policy = ip_vs_cmd_policy,
3546                 .doit   = ip_vs_genl_set_daemon,
3547         },
3548         {
3549                 .cmd    = IPVS_CMD_GET_DAEMON,
3550                 .flags  = GENL_ADMIN_PERM,
3551                 .dumpit = ip_vs_genl_dump_daemons,
3552         },
3553         {
3554                 .cmd    = IPVS_CMD_SET_CONFIG,
3555                 .flags  = GENL_ADMIN_PERM,
3556                 .policy = ip_vs_cmd_policy,
3557                 .doit   = ip_vs_genl_set_cmd,
3558         },
3559         {
3560                 .cmd    = IPVS_CMD_GET_CONFIG,
3561                 .flags  = GENL_ADMIN_PERM,
3562                 .doit   = ip_vs_genl_get_cmd,
3563         },
3564         {
3565                 .cmd    = IPVS_CMD_GET_INFO,
3566                 .flags  = GENL_ADMIN_PERM,
3567                 .doit   = ip_vs_genl_get_cmd,
3568         },
3569         {
3570                 .cmd    = IPVS_CMD_ZERO,
3571                 .flags  = GENL_ADMIN_PERM,
3572                 .policy = ip_vs_cmd_policy,
3573                 .doit   = ip_vs_genl_set_cmd,
3574         },
3575         {
3576                 .cmd    = IPVS_CMD_FLUSH,
3577                 .flags  = GENL_ADMIN_PERM,
3578                 .doit   = ip_vs_genl_set_cmd,
3579         },
3580 };
3581
3582 static int __init ip_vs_genl_register(void)
3583 {
3584         return genl_register_family_with_ops(&ip_vs_genl_family,
3585                                              ip_vs_genl_ops);
3586 }
3587
3588 static void ip_vs_genl_unregister(void)
3589 {
3590         genl_unregister_family(&ip_vs_genl_family);
3591 }
3592
3593 /* End of Generic Netlink interface definitions */
3594
3595 /*
3596  * per netns intit/exit func.
3597  */
3598 #ifdef CONFIG_SYSCTL
3599 static int __net_init ip_vs_control_net_init_sysctl(struct net *net)
3600 {
3601         int idx;
3602         struct netns_ipvs *ipvs = net_ipvs(net);
3603         struct ctl_table *tbl;
3604
3605         atomic_set(&ipvs->dropentry, 0);
3606         spin_lock_init(&ipvs->dropentry_lock);
3607         spin_lock_init(&ipvs->droppacket_lock);
3608         spin_lock_init(&ipvs->securetcp_lock);
3609
3610         if (!net_eq(net, &init_net)) {
3611                 tbl = kmemdup(vs_vars, sizeof(vs_vars), GFP_KERNEL);
3612                 if (tbl == NULL)
3613                         return -ENOMEM;
3614
3615                 /* Don't export sysctls to unprivileged users */
3616                 if (net->user_ns != &init_user_ns)
3617                         tbl[0].procname = NULL;
3618         } else
3619                 tbl = vs_vars;
3620         /* Initialize sysctl defaults */
3621         idx = 0;
3622         ipvs->sysctl_amemthresh = 1024;
3623         tbl[idx++].data = &ipvs->sysctl_amemthresh;
3624         ipvs->sysctl_am_droprate = 10;
3625         tbl[idx++].data = &ipvs->sysctl_am_droprate;
3626         tbl[idx++].data = &ipvs->sysctl_drop_entry;
3627         tbl[idx++].data = &ipvs->sysctl_drop_packet;
3628 #ifdef CONFIG_IP_VS_NFCT
3629         tbl[idx++].data = &ipvs->sysctl_conntrack;
3630 #endif
3631         tbl[idx++].data = &ipvs->sysctl_secure_tcp;
3632         ipvs->sysctl_snat_reroute = 1;
3633         tbl[idx++].data = &ipvs->sysctl_snat_reroute;
3634         ipvs->sysctl_sync_ver = 1;
3635         tbl[idx++].data = &ipvs->sysctl_sync_ver;
3636         ipvs->sysctl_sync_ports = 1;
3637         tbl[idx++].data = &ipvs->sysctl_sync_ports;
3638         tbl[idx++].data = &ipvs->sysctl_sync_persist_mode;
3639         ipvs->sysctl_sync_qlen_max = nr_free_buffer_pages() / 32;
3640         tbl[idx++].data = &ipvs->sysctl_sync_qlen_max;
3641         ipvs->sysctl_sync_sock_size = 0;
3642         tbl[idx++].data = &ipvs->sysctl_sync_sock_size;
3643         tbl[idx++].data = &ipvs->sysctl_cache_bypass;
3644         tbl[idx++].data = &ipvs->sysctl_expire_nodest_conn;
3645         tbl[idx++].data = &ipvs->sysctl_sloppy_tcp;
3646         tbl[idx++].data = &ipvs->sysctl_sloppy_sctp;
3647         tbl[idx++].data = &ipvs->sysctl_expire_quiescent_template;
3648         ipvs->sysctl_sync_threshold[0] = DEFAULT_SYNC_THRESHOLD;
3649         ipvs->sysctl_sync_threshold[1] = DEFAULT_SYNC_PERIOD;
3650         tbl[idx].data = &ipvs->sysctl_sync_threshold;
3651         tbl[idx++].maxlen = sizeof(ipvs->sysctl_sync_threshold);
3652         ipvs->sysctl_sync_refresh_period = DEFAULT_SYNC_REFRESH_PERIOD;
3653         tbl[idx++].data = &ipvs->sysctl_sync_refresh_period;
3654         ipvs->sysctl_sync_retries = clamp_t(int, DEFAULT_SYNC_RETRIES, 0, 3);
3655         tbl[idx++].data = &ipvs->sysctl_sync_retries;
3656         tbl[idx++].data = &ipvs->sysctl_nat_icmp_send;
3657         ipvs->sysctl_pmtu_disc = 1;
3658         tbl[idx++].data = &ipvs->sysctl_pmtu_disc;
3659         tbl[idx++].data = &ipvs->sysctl_backup_only;
3660
3661
3662         ipvs->sysctl_hdr = register_net_sysctl(net, "net/ipv4/vs", tbl);
3663         if (ipvs->sysctl_hdr == NULL) {
3664                 if (!net_eq(net, &init_net))
3665                         kfree(tbl);
3666                 return -ENOMEM;
3667         }
3668         ip_vs_start_estimator(net, &ipvs->tot_stats);
3669         ipvs->sysctl_tbl = tbl;
3670         /* Schedule defense work */
3671         INIT_DELAYED_WORK(&ipvs->defense_work, defense_work_handler);
3672         schedule_delayed_work(&ipvs->defense_work, DEFENSE_TIMER_PERIOD);
3673
3674         return 0;
3675 }
3676
3677 static void __net_exit ip_vs_control_net_cleanup_sysctl(struct net *net)
3678 {
3679         struct netns_ipvs *ipvs = net_ipvs(net);
3680
3681         cancel_delayed_work_sync(&ipvs->defense_work);
3682         cancel_work_sync(&ipvs->defense_work.work);
3683         unregister_net_sysctl_table(ipvs->sysctl_hdr);
3684         ip_vs_stop_estimator(net, &ipvs->tot_stats);
3685 }
3686
3687 #else
3688
3689 static int __net_init ip_vs_control_net_init_sysctl(struct net *net) { return 0; }
3690 static void __net_exit ip_vs_control_net_cleanup_sysctl(struct net *net) { }
3691
3692 #endif
3693
3694 static struct notifier_block ip_vs_dst_notifier = {
3695         .notifier_call = ip_vs_dst_event,
3696 };
3697
3698 int __net_init ip_vs_control_net_init(struct net *net)
3699 {
3700         int i, idx;
3701         struct netns_ipvs *ipvs = net_ipvs(net);
3702
3703         /* Initialize rs_table */
3704         for (idx = 0; idx < IP_VS_RTAB_SIZE; idx++)
3705                 INIT_HLIST_HEAD(&ipvs->rs_table[idx]);
3706
3707         INIT_LIST_HEAD(&ipvs->dest_trash);
3708         spin_lock_init(&ipvs->dest_trash_lock);
3709         setup_timer(&ipvs->dest_trash_timer, ip_vs_dest_trash_expire,
3710                     (unsigned long) net);
3711         atomic_set(&ipvs->ftpsvc_counter, 0);
3712         atomic_set(&ipvs->nullsvc_counter, 0);
3713
3714         /* procfs stats */
3715         ipvs->tot_stats.cpustats = alloc_percpu(struct ip_vs_cpu_stats);
3716         if (!ipvs->tot_stats.cpustats)
3717                 return -ENOMEM;
3718
3719         for_each_possible_cpu(i) {
3720                 struct ip_vs_cpu_stats *ipvs_tot_stats;
3721                 ipvs_tot_stats = per_cpu_ptr(ipvs->tot_stats.cpustats, i);
3722                 u64_stats_init(&ipvs_tot_stats->syncp);
3723         }
3724
3725         spin_lock_init(&ipvs->tot_stats.lock);
3726
3727         proc_create("ip_vs", 0, net->proc_net, &ip_vs_info_fops);
3728         proc_create("ip_vs_stats", 0, net->proc_net, &ip_vs_stats_fops);
3729         proc_create("ip_vs_stats_percpu", 0, net->proc_net,
3730                     &ip_vs_stats_percpu_fops);
3731
3732         if (ip_vs_control_net_init_sysctl(net))
3733                 goto err;
3734
3735         return 0;
3736
3737 err:
3738         free_percpu(ipvs->tot_stats.cpustats);
3739         return -ENOMEM;
3740 }
3741
3742 void __net_exit ip_vs_control_net_cleanup(struct net *net)
3743 {
3744         struct netns_ipvs *ipvs = net_ipvs(net);
3745
3746         ip_vs_trash_cleanup(net);
3747         ip_vs_control_net_cleanup_sysctl(net);
3748         remove_proc_entry("ip_vs_stats_percpu", net->proc_net);
3749         remove_proc_entry("ip_vs_stats", net->proc_net);
3750         remove_proc_entry("ip_vs", net->proc_net);
3751         free_percpu(ipvs->tot_stats.cpustats);
3752 }
3753
3754 int __init ip_vs_register_nl_ioctl(void)
3755 {
3756         int ret;
3757
3758         ret = nf_register_sockopt(&ip_vs_sockopts);
3759         if (ret) {
3760                 pr_err("cannot register sockopt.\n");
3761                 goto err_sock;
3762         }
3763
3764         ret = ip_vs_genl_register();
3765         if (ret) {
3766                 pr_err("cannot register Generic Netlink interface.\n");
3767                 goto err_genl;
3768         }
3769         return 0;
3770
3771 err_genl:
3772         nf_unregister_sockopt(&ip_vs_sockopts);
3773 err_sock:
3774         return ret;
3775 }
3776
3777 void ip_vs_unregister_nl_ioctl(void)
3778 {
3779         ip_vs_genl_unregister();
3780         nf_unregister_sockopt(&ip_vs_sockopts);
3781 }
3782
3783 int __init ip_vs_control_init(void)
3784 {
3785         int idx;
3786         int ret;
3787
3788         EnterFunction(2);
3789
3790         /* Initialize svc_table, ip_vs_svc_fwm_table */
3791         for (idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
3792                 INIT_HLIST_HEAD(&ip_vs_svc_table[idx]);
3793                 INIT_HLIST_HEAD(&ip_vs_svc_fwm_table[idx]);
3794         }
3795
3796         smp_wmb();      /* Do we really need it now ? */
3797
3798         ret = register_netdevice_notifier(&ip_vs_dst_notifier);
3799         if (ret < 0)
3800                 return ret;
3801
3802         LeaveFunction(2);
3803         return 0;
3804 }
3805
3806
3807 void ip_vs_control_cleanup(void)
3808 {
3809         EnterFunction(2);
3810         unregister_netdevice_notifier(&ip_vs_dst_notifier);
3811         LeaveFunction(2);
3812 }