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