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(struct 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(struct 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(struct 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(struct 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_persist_mode",
1719                 .maxlen         = sizeof(int),
1720                 .mode           = 0644,
1721                 .proc_handler   = proc_dointvec,
1722         },
1723         {
1724                 .procname       = "sync_qlen_max",
1725                 .maxlen         = sizeof(unsigned long),
1726                 .mode           = 0644,
1727                 .proc_handler   = proc_doulongvec_minmax,
1728         },
1729         {
1730                 .procname       = "sync_sock_size",
1731                 .maxlen         = sizeof(int),
1732                 .mode           = 0644,
1733                 .proc_handler   = proc_dointvec,
1734         },
1735         {
1736                 .procname       = "cache_bypass",
1737                 .maxlen         = sizeof(int),
1738                 .mode           = 0644,
1739                 .proc_handler   = proc_dointvec,
1740         },
1741         {
1742                 .procname       = "expire_nodest_conn",
1743                 .maxlen         = sizeof(int),
1744                 .mode           = 0644,
1745                 .proc_handler   = proc_dointvec,
1746         },
1747         {
1748                 .procname       = "sloppy_tcp",
1749                 .maxlen         = sizeof(int),
1750                 .mode           = 0644,
1751                 .proc_handler   = proc_dointvec,
1752         },
1753         {
1754                 .procname       = "sloppy_sctp",
1755                 .maxlen         = sizeof(int),
1756                 .mode           = 0644,
1757                 .proc_handler   = proc_dointvec,
1758         },
1759         {
1760                 .procname       = "expire_quiescent_template",
1761                 .maxlen         = sizeof(int),
1762                 .mode           = 0644,
1763                 .proc_handler   = proc_dointvec,
1764         },
1765         {
1766                 .procname       = "sync_threshold",
1767                 .maxlen         =
1768                         sizeof(((struct netns_ipvs *)0)->sysctl_sync_threshold),
1769                 .mode           = 0644,
1770                 .proc_handler   = proc_do_sync_threshold,
1771         },
1772         {
1773                 .procname       = "sync_refresh_period",
1774                 .maxlen         = sizeof(int),
1775                 .mode           = 0644,
1776                 .proc_handler   = proc_dointvec_jiffies,
1777         },
1778         {
1779                 .procname       = "sync_retries",
1780                 .maxlen         = sizeof(int),
1781                 .mode           = 0644,
1782                 .proc_handler   = proc_dointvec_minmax,
1783                 .extra1         = &zero,
1784                 .extra2         = &three,
1785         },
1786         {
1787                 .procname       = "nat_icmp_send",
1788                 .maxlen         = sizeof(int),
1789                 .mode           = 0644,
1790                 .proc_handler   = proc_dointvec,
1791         },
1792         {
1793                 .procname       = "pmtu_disc",
1794                 .maxlen         = sizeof(int),
1795                 .mode           = 0644,
1796                 .proc_handler   = proc_dointvec,
1797         },
1798         {
1799                 .procname       = "backup_only",
1800                 .maxlen         = sizeof(int),
1801                 .mode           = 0644,
1802                 .proc_handler   = proc_dointvec,
1803         },
1804 #ifdef CONFIG_IP_VS_DEBUG
1805         {
1806                 .procname       = "debug_level",
1807                 .data           = &sysctl_ip_vs_debug_level,
1808                 .maxlen         = sizeof(int),
1809                 .mode           = 0644,
1810                 .proc_handler   = proc_dointvec,
1811         },
1812 #endif
1813 #if 0
1814         {
1815                 .procname       = "timeout_established",
1816                 .data   = &vs_timeout_table_dos.timeout[IP_VS_S_ESTABLISHED],
1817                 .maxlen         = sizeof(int),
1818                 .mode           = 0644,
1819                 .proc_handler   = proc_dointvec_jiffies,
1820         },
1821         {
1822                 .procname       = "timeout_synsent",
1823                 .data   = &vs_timeout_table_dos.timeout[IP_VS_S_SYN_SENT],
1824                 .maxlen         = sizeof(int),
1825                 .mode           = 0644,
1826                 .proc_handler   = proc_dointvec_jiffies,
1827         },
1828         {
1829                 .procname       = "timeout_synrecv",
1830                 .data   = &vs_timeout_table_dos.timeout[IP_VS_S_SYN_RECV],
1831                 .maxlen         = sizeof(int),
1832                 .mode           = 0644,
1833                 .proc_handler   = proc_dointvec_jiffies,
1834         },
1835         {
1836                 .procname       = "timeout_finwait",
1837                 .data   = &vs_timeout_table_dos.timeout[IP_VS_S_FIN_WAIT],
1838                 .maxlen         = sizeof(int),
1839                 .mode           = 0644,
1840                 .proc_handler   = proc_dointvec_jiffies,
1841         },
1842         {
1843                 .procname       = "timeout_timewait",
1844                 .data   = &vs_timeout_table_dos.timeout[IP_VS_S_TIME_WAIT],
1845                 .maxlen         = sizeof(int),
1846                 .mode           = 0644,
1847                 .proc_handler   = proc_dointvec_jiffies,
1848         },
1849         {
1850                 .procname       = "timeout_close",
1851                 .data   = &vs_timeout_table_dos.timeout[IP_VS_S_CLOSE],
1852                 .maxlen         = sizeof(int),
1853                 .mode           = 0644,
1854                 .proc_handler   = proc_dointvec_jiffies,
1855         },
1856         {
1857                 .procname       = "timeout_closewait",
1858                 .data   = &vs_timeout_table_dos.timeout[IP_VS_S_CLOSE_WAIT],
1859                 .maxlen         = sizeof(int),
1860                 .mode           = 0644,
1861                 .proc_handler   = proc_dointvec_jiffies,
1862         },
1863         {
1864                 .procname       = "timeout_lastack",
1865                 .data   = &vs_timeout_table_dos.timeout[IP_VS_S_LAST_ACK],
1866                 .maxlen         = sizeof(int),
1867                 .mode           = 0644,
1868                 .proc_handler   = proc_dointvec_jiffies,
1869         },
1870         {
1871                 .procname       = "timeout_listen",
1872                 .data   = &vs_timeout_table_dos.timeout[IP_VS_S_LISTEN],
1873                 .maxlen         = sizeof(int),
1874                 .mode           = 0644,
1875                 .proc_handler   = proc_dointvec_jiffies,
1876         },
1877         {
1878                 .procname       = "timeout_synack",
1879                 .data   = &vs_timeout_table_dos.timeout[IP_VS_S_SYNACK],
1880                 .maxlen         = sizeof(int),
1881                 .mode           = 0644,
1882                 .proc_handler   = proc_dointvec_jiffies,
1883         },
1884         {
1885                 .procname       = "timeout_udp",
1886                 .data   = &vs_timeout_table_dos.timeout[IP_VS_S_UDP],
1887                 .maxlen         = sizeof(int),
1888                 .mode           = 0644,
1889                 .proc_handler   = proc_dointvec_jiffies,
1890         },
1891         {
1892                 .procname       = "timeout_icmp",
1893                 .data   = &vs_timeout_table_dos.timeout[IP_VS_S_ICMP],
1894                 .maxlen         = sizeof(int),
1895                 .mode           = 0644,
1896                 .proc_handler   = proc_dointvec_jiffies,
1897         },
1898 #endif
1899         { }
1900 };
1901
1902 #endif
1903
1904 #ifdef CONFIG_PROC_FS
1905
1906 struct ip_vs_iter {
1907         struct seq_net_private p;  /* Do not move this, netns depends upon it*/
1908         struct hlist_head *table;
1909         int bucket;
1910 };
1911
1912 /*
1913  *      Write the contents of the VS rule table to a PROCfs file.
1914  *      (It is kept just for backward compatibility)
1915  */
1916 static inline const char *ip_vs_fwd_name(unsigned int flags)
1917 {
1918         switch (flags & IP_VS_CONN_F_FWD_MASK) {
1919         case IP_VS_CONN_F_LOCALNODE:
1920                 return "Local";
1921         case IP_VS_CONN_F_TUNNEL:
1922                 return "Tunnel";
1923         case IP_VS_CONN_F_DROUTE:
1924                 return "Route";
1925         default:
1926                 return "Masq";
1927         }
1928 }
1929
1930
1931 /* Get the Nth entry in the two lists */
1932 static struct ip_vs_service *ip_vs_info_array(struct seq_file *seq, loff_t pos)
1933 {
1934         struct net *net = seq_file_net(seq);
1935         struct ip_vs_iter *iter = seq->private;
1936         int idx;
1937         struct ip_vs_service *svc;
1938
1939         /* look in hash by protocol */
1940         for (idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
1941                 hlist_for_each_entry_rcu(svc, &ip_vs_svc_table[idx], s_list) {
1942                         if (net_eq(svc->net, net) && pos-- == 0) {
1943                                 iter->table = ip_vs_svc_table;
1944                                 iter->bucket = idx;
1945                                 return svc;
1946                         }
1947                 }
1948         }
1949
1950         /* keep looking in fwmark */
1951         for (idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
1952                 hlist_for_each_entry_rcu(svc, &ip_vs_svc_fwm_table[idx],
1953                                          f_list) {
1954                         if (net_eq(svc->net, net) && pos-- == 0) {
1955                                 iter->table = ip_vs_svc_fwm_table;
1956                                 iter->bucket = idx;
1957                                 return svc;
1958                         }
1959                 }
1960         }
1961
1962         return NULL;
1963 }
1964
1965 static void *ip_vs_info_seq_start(struct seq_file *seq, loff_t *pos)
1966         __acquires(RCU)
1967 {
1968         rcu_read_lock();
1969         return *pos ? ip_vs_info_array(seq, *pos - 1) : SEQ_START_TOKEN;
1970 }
1971
1972
1973 static void *ip_vs_info_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1974 {
1975         struct hlist_node *e;
1976         struct ip_vs_iter *iter;
1977         struct ip_vs_service *svc;
1978
1979         ++*pos;
1980         if (v == SEQ_START_TOKEN)
1981                 return ip_vs_info_array(seq,0);
1982
1983         svc = v;
1984         iter = seq->private;
1985
1986         if (iter->table == ip_vs_svc_table) {
1987                 /* next service in table hashed by protocol */
1988                 e = rcu_dereference(hlist_next_rcu(&svc->s_list));
1989                 if (e)
1990                         return hlist_entry(e, struct ip_vs_service, s_list);
1991
1992                 while (++iter->bucket < IP_VS_SVC_TAB_SIZE) {
1993                         hlist_for_each_entry_rcu(svc,
1994                                                  &ip_vs_svc_table[iter->bucket],
1995                                                  s_list) {
1996                                 return svc;
1997                         }
1998                 }
1999
2000                 iter->table = ip_vs_svc_fwm_table;
2001                 iter->bucket = -1;
2002                 goto scan_fwmark;
2003         }
2004
2005         /* next service in hashed by fwmark */
2006         e = rcu_dereference(hlist_next_rcu(&svc->f_list));
2007         if (e)
2008                 return hlist_entry(e, struct ip_vs_service, f_list);
2009
2010  scan_fwmark:
2011         while (++iter->bucket < IP_VS_SVC_TAB_SIZE) {
2012                 hlist_for_each_entry_rcu(svc,
2013                                          &ip_vs_svc_fwm_table[iter->bucket],
2014                                          f_list)
2015                         return svc;
2016         }
2017
2018         return NULL;
2019 }
2020
2021 static void ip_vs_info_seq_stop(struct seq_file *seq, void *v)
2022         __releases(RCU)
2023 {
2024         rcu_read_unlock();
2025 }
2026
2027
2028 static int ip_vs_info_seq_show(struct seq_file *seq, void *v)
2029 {
2030         if (v == SEQ_START_TOKEN) {
2031                 seq_printf(seq,
2032                         "IP Virtual Server version %d.%d.%d (size=%d)\n",
2033                         NVERSION(IP_VS_VERSION_CODE), ip_vs_conn_tab_size);
2034                 seq_puts(seq,
2035                          "Prot LocalAddress:Port Scheduler Flags\n");
2036                 seq_puts(seq,
2037                          "  -> RemoteAddress:Port Forward Weight ActiveConn InActConn\n");
2038         } else {
2039                 const struct ip_vs_service *svc = v;
2040                 const struct ip_vs_iter *iter = seq->private;
2041                 const struct ip_vs_dest *dest;
2042                 struct ip_vs_scheduler *sched = rcu_dereference(svc->scheduler);
2043
2044                 if (iter->table == ip_vs_svc_table) {
2045 #ifdef CONFIG_IP_VS_IPV6
2046                         if (svc->af == AF_INET6)
2047                                 seq_printf(seq, "%s  [%pI6]:%04X %s ",
2048                                            ip_vs_proto_name(svc->protocol),
2049                                            &svc->addr.in6,
2050                                            ntohs(svc->port),
2051                                            sched->name);
2052                         else
2053 #endif
2054                                 seq_printf(seq, "%s  %08X:%04X %s %s ",
2055                                            ip_vs_proto_name(svc->protocol),
2056                                            ntohl(svc->addr.ip),
2057                                            ntohs(svc->port),
2058                                            sched->name,
2059                                            (svc->flags & IP_VS_SVC_F_ONEPACKET)?"ops ":"");
2060                 } else {
2061                         seq_printf(seq, "FWM  %08X %s %s",
2062                                    svc->fwmark, sched->name,
2063                                    (svc->flags & IP_VS_SVC_F_ONEPACKET)?"ops ":"");
2064                 }
2065
2066                 if (svc->flags & IP_VS_SVC_F_PERSISTENT)
2067                         seq_printf(seq, "persistent %d %08X\n",
2068                                 svc->timeout,
2069                                 ntohl(svc->netmask));
2070                 else
2071                         seq_putc(seq, '\n');
2072
2073                 list_for_each_entry_rcu(dest, &svc->destinations, n_list) {
2074 #ifdef CONFIG_IP_VS_IPV6
2075                         if (dest->af == AF_INET6)
2076                                 seq_printf(seq,
2077                                            "  -> [%pI6]:%04X"
2078                                            "      %-7s %-6d %-10d %-10d\n",
2079                                            &dest->addr.in6,
2080                                            ntohs(dest->port),
2081                                            ip_vs_fwd_name(atomic_read(&dest->conn_flags)),
2082                                            atomic_read(&dest->weight),
2083                                            atomic_read(&dest->activeconns),
2084                                            atomic_read(&dest->inactconns));
2085                         else
2086 #endif
2087                                 seq_printf(seq,
2088                                            "  -> %08X:%04X      "
2089                                            "%-7s %-6d %-10d %-10d\n",
2090                                            ntohl(dest->addr.ip),
2091                                            ntohs(dest->port),
2092                                            ip_vs_fwd_name(atomic_read(&dest->conn_flags)),
2093                                            atomic_read(&dest->weight),
2094                                            atomic_read(&dest->activeconns),
2095                                            atomic_read(&dest->inactconns));
2096
2097                 }
2098         }
2099         return 0;
2100 }
2101
2102 static const struct seq_operations ip_vs_info_seq_ops = {
2103         .start = ip_vs_info_seq_start,
2104         .next  = ip_vs_info_seq_next,
2105         .stop  = ip_vs_info_seq_stop,
2106         .show  = ip_vs_info_seq_show,
2107 };
2108
2109 static int ip_vs_info_open(struct inode *inode, struct file *file)
2110 {
2111         return seq_open_net(inode, file, &ip_vs_info_seq_ops,
2112                         sizeof(struct ip_vs_iter));
2113 }
2114
2115 static const struct file_operations ip_vs_info_fops = {
2116         .owner   = THIS_MODULE,
2117         .open    = ip_vs_info_open,
2118         .read    = seq_read,
2119         .llseek  = seq_lseek,
2120         .release = seq_release_net,
2121 };
2122
2123 static int ip_vs_stats_show(struct seq_file *seq, void *v)
2124 {
2125         struct net *net = seq_file_single_net(seq);
2126         struct ip_vs_stats_user show;
2127
2128 /*               01234567 01234567 01234567 0123456701234567 0123456701234567 */
2129         seq_puts(seq,
2130                  "   Total Incoming Outgoing         Incoming         Outgoing\n");
2131         seq_printf(seq,
2132                    "   Conns  Packets  Packets            Bytes            Bytes\n");
2133
2134         ip_vs_copy_stats(&show, &net_ipvs(net)->tot_stats);
2135         seq_printf(seq, "%8X %8X %8X %16LX %16LX\n\n", show.conns,
2136                    show.inpkts, show.outpkts,
2137                    (unsigned long long) show.inbytes,
2138                    (unsigned long long) show.outbytes);
2139
2140 /*                 01234567 01234567 01234567 0123456701234567 0123456701234567 */
2141         seq_puts(seq,
2142                    " Conns/s   Pkts/s   Pkts/s          Bytes/s          Bytes/s\n");
2143         seq_printf(seq, "%8X %8X %8X %16X %16X\n",
2144                         show.cps, show.inpps, show.outpps,
2145                         show.inbps, show.outbps);
2146
2147         return 0;
2148 }
2149
2150 static int ip_vs_stats_seq_open(struct inode *inode, struct file *file)
2151 {
2152         return single_open_net(inode, file, ip_vs_stats_show);
2153 }
2154
2155 static const struct file_operations ip_vs_stats_fops = {
2156         .owner = THIS_MODULE,
2157         .open = ip_vs_stats_seq_open,
2158         .read = seq_read,
2159         .llseek = seq_lseek,
2160         .release = single_release_net,
2161 };
2162
2163 static int ip_vs_stats_percpu_show(struct seq_file *seq, void *v)
2164 {
2165         struct net *net = seq_file_single_net(seq);
2166         struct ip_vs_stats *tot_stats = &net_ipvs(net)->tot_stats;
2167         struct ip_vs_cpu_stats __percpu *cpustats = tot_stats->cpustats;
2168         struct ip_vs_stats_user rates;
2169         int i;
2170
2171 /*               01234567 01234567 01234567 0123456701234567 0123456701234567 */
2172         seq_puts(seq,
2173                  "       Total Incoming Outgoing         Incoming         Outgoing\n");
2174         seq_printf(seq,
2175                    "CPU    Conns  Packets  Packets            Bytes            Bytes\n");
2176
2177         for_each_possible_cpu(i) {
2178                 struct ip_vs_cpu_stats *u = per_cpu_ptr(cpustats, i);
2179                 unsigned int start;
2180                 __u64 inbytes, outbytes;
2181
2182                 do {
2183                         start = u64_stats_fetch_begin_bh(&u->syncp);
2184                         inbytes = u->ustats.inbytes;
2185                         outbytes = u->ustats.outbytes;
2186                 } while (u64_stats_fetch_retry_bh(&u->syncp, start));
2187
2188                 seq_printf(seq, "%3X %8X %8X %8X %16LX %16LX\n",
2189                            i, u->ustats.conns, u->ustats.inpkts,
2190                            u->ustats.outpkts, (__u64)inbytes,
2191                            (__u64)outbytes);
2192         }
2193
2194         spin_lock_bh(&tot_stats->lock);
2195
2196         seq_printf(seq, "  ~ %8X %8X %8X %16LX %16LX\n\n",
2197                    tot_stats->ustats.conns, tot_stats->ustats.inpkts,
2198                    tot_stats->ustats.outpkts,
2199                    (unsigned long long) tot_stats->ustats.inbytes,
2200                    (unsigned long long) tot_stats->ustats.outbytes);
2201
2202         ip_vs_read_estimator(&rates, tot_stats);
2203
2204         spin_unlock_bh(&tot_stats->lock);
2205
2206 /*                 01234567 01234567 01234567 0123456701234567 0123456701234567 */
2207         seq_puts(seq,
2208                    "     Conns/s   Pkts/s   Pkts/s          Bytes/s          Bytes/s\n");
2209         seq_printf(seq, "    %8X %8X %8X %16X %16X\n",
2210                         rates.cps,
2211                         rates.inpps,
2212                         rates.outpps,
2213                         rates.inbps,
2214                         rates.outbps);
2215
2216         return 0;
2217 }
2218
2219 static int ip_vs_stats_percpu_seq_open(struct inode *inode, struct file *file)
2220 {
2221         return single_open_net(inode, file, ip_vs_stats_percpu_show);
2222 }
2223
2224 static const struct file_operations ip_vs_stats_percpu_fops = {
2225         .owner = THIS_MODULE,
2226         .open = ip_vs_stats_percpu_seq_open,
2227         .read = seq_read,
2228         .llseek = seq_lseek,
2229         .release = single_release_net,
2230 };
2231 #endif
2232
2233 /*
2234  *      Set timeout values for tcp tcpfin udp in the timeout_table.
2235  */
2236 static int ip_vs_set_timeout(struct net *net, struct ip_vs_timeout_user *u)
2237 {
2238 #if defined(CONFIG_IP_VS_PROTO_TCP) || defined(CONFIG_IP_VS_PROTO_UDP)
2239         struct ip_vs_proto_data *pd;
2240 #endif
2241
2242         IP_VS_DBG(2, "Setting timeout tcp:%d tcpfin:%d udp:%d\n",
2243                   u->tcp_timeout,
2244                   u->tcp_fin_timeout,
2245                   u->udp_timeout);
2246
2247 #ifdef CONFIG_IP_VS_PROTO_TCP
2248         if (u->tcp_timeout) {
2249                 pd = ip_vs_proto_data_get(net, IPPROTO_TCP);
2250                 pd->timeout_table[IP_VS_TCP_S_ESTABLISHED]
2251                         = u->tcp_timeout * HZ;
2252         }
2253
2254         if (u->tcp_fin_timeout) {
2255                 pd = ip_vs_proto_data_get(net, IPPROTO_TCP);
2256                 pd->timeout_table[IP_VS_TCP_S_FIN_WAIT]
2257                         = u->tcp_fin_timeout * HZ;
2258         }
2259 #endif
2260
2261 #ifdef CONFIG_IP_VS_PROTO_UDP
2262         if (u->udp_timeout) {
2263                 pd = ip_vs_proto_data_get(net, IPPROTO_UDP);
2264                 pd->timeout_table[IP_VS_UDP_S_NORMAL]
2265                         = u->udp_timeout * HZ;
2266         }
2267 #endif
2268         return 0;
2269 }
2270
2271
2272 #define SET_CMDID(cmd)          (cmd - IP_VS_BASE_CTL)
2273 #define SERVICE_ARG_LEN         (sizeof(struct ip_vs_service_user))
2274 #define SVCDEST_ARG_LEN         (sizeof(struct ip_vs_service_user) +    \
2275                                  sizeof(struct ip_vs_dest_user))
2276 #define TIMEOUT_ARG_LEN         (sizeof(struct ip_vs_timeout_user))
2277 #define DAEMON_ARG_LEN          (sizeof(struct ip_vs_daemon_user))
2278 #define MAX_ARG_LEN             SVCDEST_ARG_LEN
2279
2280 static const unsigned char set_arglen[SET_CMDID(IP_VS_SO_SET_MAX)+1] = {
2281         [SET_CMDID(IP_VS_SO_SET_ADD)]           = SERVICE_ARG_LEN,
2282         [SET_CMDID(IP_VS_SO_SET_EDIT)]          = SERVICE_ARG_LEN,
2283         [SET_CMDID(IP_VS_SO_SET_DEL)]           = SERVICE_ARG_LEN,
2284         [SET_CMDID(IP_VS_SO_SET_FLUSH)]         = 0,
2285         [SET_CMDID(IP_VS_SO_SET_ADDDEST)]       = SVCDEST_ARG_LEN,
2286         [SET_CMDID(IP_VS_SO_SET_DELDEST)]       = SVCDEST_ARG_LEN,
2287         [SET_CMDID(IP_VS_SO_SET_EDITDEST)]      = SVCDEST_ARG_LEN,
2288         [SET_CMDID(IP_VS_SO_SET_TIMEOUT)]       = TIMEOUT_ARG_LEN,
2289         [SET_CMDID(IP_VS_SO_SET_STARTDAEMON)]   = DAEMON_ARG_LEN,
2290         [SET_CMDID(IP_VS_SO_SET_STOPDAEMON)]    = DAEMON_ARG_LEN,
2291         [SET_CMDID(IP_VS_SO_SET_ZERO)]          = SERVICE_ARG_LEN,
2292 };
2293
2294 static void ip_vs_copy_usvc_compat(struct ip_vs_service_user_kern *usvc,
2295                                   struct ip_vs_service_user *usvc_compat)
2296 {
2297         memset(usvc, 0, sizeof(*usvc));
2298
2299         usvc->af                = AF_INET;
2300         usvc->protocol          = usvc_compat->protocol;
2301         usvc->addr.ip           = usvc_compat->addr;
2302         usvc->port              = usvc_compat->port;
2303         usvc->fwmark            = usvc_compat->fwmark;
2304
2305         /* Deep copy of sched_name is not needed here */
2306         usvc->sched_name        = usvc_compat->sched_name;
2307
2308         usvc->flags             = usvc_compat->flags;
2309         usvc->timeout           = usvc_compat->timeout;
2310         usvc->netmask           = usvc_compat->netmask;
2311 }
2312
2313 static void ip_vs_copy_udest_compat(struct ip_vs_dest_user_kern *udest,
2314                                    struct ip_vs_dest_user *udest_compat)
2315 {
2316         memset(udest, 0, sizeof(*udest));
2317
2318         udest->addr.ip          = udest_compat->addr;
2319         udest->port             = udest_compat->port;
2320         udest->conn_flags       = udest_compat->conn_flags;
2321         udest->weight           = udest_compat->weight;
2322         udest->u_threshold      = udest_compat->u_threshold;
2323         udest->l_threshold      = udest_compat->l_threshold;
2324 }
2325
2326 static int
2327 do_ip_vs_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len)
2328 {
2329         struct net *net = sock_net(sk);
2330         int ret;
2331         unsigned char arg[MAX_ARG_LEN];
2332         struct ip_vs_service_user *usvc_compat;
2333         struct ip_vs_service_user_kern usvc;
2334         struct ip_vs_service *svc;
2335         struct ip_vs_dest_user *udest_compat;
2336         struct ip_vs_dest_user_kern udest;
2337         struct netns_ipvs *ipvs = net_ipvs(net);
2338
2339         if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
2340                 return -EPERM;
2341
2342         if (cmd < IP_VS_BASE_CTL || cmd > IP_VS_SO_SET_MAX)
2343                 return -EINVAL;
2344         if (len < 0 || len >  MAX_ARG_LEN)
2345                 return -EINVAL;
2346         if (len != set_arglen[SET_CMDID(cmd)]) {
2347                 pr_err("set_ctl: len %u != %u\n",
2348                        len, set_arglen[SET_CMDID(cmd)]);
2349                 return -EINVAL;
2350         }
2351
2352         if (copy_from_user(arg, user, len) != 0)
2353                 return -EFAULT;
2354
2355         /* increase the module use count */
2356         ip_vs_use_count_inc();
2357
2358         /* Handle daemons since they have another lock */
2359         if (cmd == IP_VS_SO_SET_STARTDAEMON ||
2360             cmd == IP_VS_SO_SET_STOPDAEMON) {
2361                 struct ip_vs_daemon_user *dm = (struct ip_vs_daemon_user *)arg;
2362
2363                 if (mutex_lock_interruptible(&ipvs->sync_mutex)) {
2364                         ret = -ERESTARTSYS;
2365                         goto out_dec;
2366                 }
2367                 if (cmd == IP_VS_SO_SET_STARTDAEMON)
2368                         ret = start_sync_thread(net, dm->state, dm->mcast_ifn,
2369                                                 dm->syncid);
2370                 else
2371                         ret = stop_sync_thread(net, dm->state);
2372                 mutex_unlock(&ipvs->sync_mutex);
2373                 goto out_dec;
2374         }
2375
2376         if (mutex_lock_interruptible(&__ip_vs_mutex)) {
2377                 ret = -ERESTARTSYS;
2378                 goto out_dec;
2379         }
2380
2381         if (cmd == IP_VS_SO_SET_FLUSH) {
2382                 /* Flush the virtual service */
2383                 ret = ip_vs_flush(net, false);
2384                 goto out_unlock;
2385         } else if (cmd == IP_VS_SO_SET_TIMEOUT) {
2386                 /* Set timeout values for (tcp tcpfin udp) */
2387                 ret = ip_vs_set_timeout(net, (struct ip_vs_timeout_user *)arg);
2388                 goto out_unlock;
2389         }
2390
2391         usvc_compat = (struct ip_vs_service_user *)arg;
2392         udest_compat = (struct ip_vs_dest_user *)(usvc_compat + 1);
2393
2394         /* We only use the new structs internally, so copy userspace compat
2395          * structs to extended internal versions */
2396         ip_vs_copy_usvc_compat(&usvc, usvc_compat);
2397         ip_vs_copy_udest_compat(&udest, udest_compat);
2398
2399         if (cmd == IP_VS_SO_SET_ZERO) {
2400                 /* if no service address is set, zero counters in all */
2401                 if (!usvc.fwmark && !usvc.addr.ip && !usvc.port) {
2402                         ret = ip_vs_zero_all(net);
2403                         goto out_unlock;
2404                 }
2405         }
2406
2407         /* Check for valid protocol: TCP or UDP or SCTP, even for fwmark!=0 */
2408         if (usvc.protocol != IPPROTO_TCP && usvc.protocol != IPPROTO_UDP &&
2409             usvc.protocol != IPPROTO_SCTP) {
2410                 pr_err("set_ctl: invalid protocol: %d %pI4:%d %s\n",
2411                        usvc.protocol, &usvc.addr.ip,
2412                        ntohs(usvc.port), usvc.sched_name);
2413                 ret = -EFAULT;
2414                 goto out_unlock;
2415         }
2416
2417         /* Lookup the exact service by <protocol, addr, port> or fwmark */
2418         rcu_read_lock();
2419         if (usvc.fwmark == 0)
2420                 svc = __ip_vs_service_find(net, usvc.af, usvc.protocol,
2421                                            &usvc.addr, usvc.port);
2422         else
2423                 svc = __ip_vs_svc_fwm_find(net, usvc.af, usvc.fwmark);
2424         rcu_read_unlock();
2425
2426         if (cmd != IP_VS_SO_SET_ADD
2427             && (svc == NULL || svc->protocol != usvc.protocol)) {
2428                 ret = -ESRCH;
2429                 goto out_unlock;
2430         }
2431
2432         switch (cmd) {
2433         case IP_VS_SO_SET_ADD:
2434                 if (svc != NULL)
2435                         ret = -EEXIST;
2436                 else
2437                         ret = ip_vs_add_service(net, &usvc, &svc);
2438                 break;
2439         case IP_VS_SO_SET_EDIT:
2440                 ret = ip_vs_edit_service(svc, &usvc);
2441                 break;
2442         case IP_VS_SO_SET_DEL:
2443                 ret = ip_vs_del_service(svc);
2444                 if (!ret)
2445                         goto out_unlock;
2446                 break;
2447         case IP_VS_SO_SET_ZERO:
2448                 ret = ip_vs_zero_service(svc);
2449                 break;
2450         case IP_VS_SO_SET_ADDDEST:
2451                 ret = ip_vs_add_dest(svc, &udest);
2452                 break;
2453         case IP_VS_SO_SET_EDITDEST:
2454                 ret = ip_vs_edit_dest(svc, &udest);
2455                 break;
2456         case IP_VS_SO_SET_DELDEST:
2457                 ret = ip_vs_del_dest(svc, &udest);
2458                 break;
2459         default:
2460                 ret = -EINVAL;
2461         }
2462
2463   out_unlock:
2464         mutex_unlock(&__ip_vs_mutex);
2465   out_dec:
2466         /* decrease the module use count */
2467         ip_vs_use_count_dec();
2468
2469         return ret;
2470 }
2471
2472
2473 static void
2474 ip_vs_copy_service(struct ip_vs_service_entry *dst, struct ip_vs_service *src)
2475 {
2476         struct ip_vs_scheduler *sched;
2477
2478         sched = rcu_dereference_protected(src->scheduler, 1);
2479         dst->protocol = src->protocol;
2480         dst->addr = src->addr.ip;
2481         dst->port = src->port;
2482         dst->fwmark = src->fwmark;
2483         strlcpy(dst->sched_name, sched->name, sizeof(dst->sched_name));
2484         dst->flags = src->flags;
2485         dst->timeout = src->timeout / HZ;
2486         dst->netmask = src->netmask;
2487         dst->num_dests = src->num_dests;
2488         ip_vs_copy_stats(&dst->stats, &src->stats);
2489 }
2490
2491 static inline int
2492 __ip_vs_get_service_entries(struct net *net,
2493                             const struct ip_vs_get_services *get,
2494                             struct ip_vs_get_services __user *uptr)
2495 {
2496         int idx, count=0;
2497         struct ip_vs_service *svc;
2498         struct ip_vs_service_entry entry;
2499         int ret = 0;
2500
2501         for (idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
2502                 hlist_for_each_entry(svc, &ip_vs_svc_table[idx], s_list) {
2503                         /* Only expose IPv4 entries to old interface */
2504                         if (svc->af != AF_INET || !net_eq(svc->net, net))
2505                                 continue;
2506
2507                         if (count >= get->num_services)
2508                                 goto out;
2509                         memset(&entry, 0, sizeof(entry));
2510                         ip_vs_copy_service(&entry, svc);
2511                         if (copy_to_user(&uptr->entrytable[count],
2512                                          &entry, sizeof(entry))) {
2513                                 ret = -EFAULT;
2514                                 goto out;
2515                         }
2516                         count++;
2517                 }
2518         }
2519
2520         for (idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
2521                 hlist_for_each_entry(svc, &ip_vs_svc_fwm_table[idx], f_list) {
2522                         /* Only expose IPv4 entries to old interface */
2523                         if (svc->af != AF_INET || !net_eq(svc->net, net))
2524                                 continue;
2525
2526                         if (count >= get->num_services)
2527                                 goto out;
2528                         memset(&entry, 0, sizeof(entry));
2529                         ip_vs_copy_service(&entry, svc);
2530                         if (copy_to_user(&uptr->entrytable[count],
2531                                          &entry, sizeof(entry))) {
2532                                 ret = -EFAULT;
2533                                 goto out;
2534                         }
2535                         count++;
2536                 }
2537         }
2538 out:
2539         return ret;
2540 }
2541
2542 static inline int
2543 __ip_vs_get_dest_entries(struct net *net, const struct ip_vs_get_dests *get,
2544                          struct ip_vs_get_dests __user *uptr)
2545 {
2546         struct ip_vs_service *svc;
2547         union nf_inet_addr addr = { .ip = get->addr };
2548         int ret = 0;
2549
2550         rcu_read_lock();
2551         if (get->fwmark)
2552                 svc = __ip_vs_svc_fwm_find(net, AF_INET, get->fwmark);
2553         else
2554                 svc = __ip_vs_service_find(net, AF_INET, get->protocol, &addr,
2555                                            get->port);
2556         rcu_read_unlock();
2557
2558         if (svc) {
2559                 int count = 0;
2560                 struct ip_vs_dest *dest;
2561                 struct ip_vs_dest_entry entry;
2562
2563                 memset(&entry, 0, sizeof(entry));
2564                 list_for_each_entry(dest, &svc->destinations, n_list) {
2565                         if (count >= get->num_dests)
2566                                 break;
2567
2568                         entry.addr = dest->addr.ip;
2569                         entry.port = dest->port;
2570                         entry.conn_flags = atomic_read(&dest->conn_flags);
2571                         entry.weight = atomic_read(&dest->weight);
2572                         entry.u_threshold = dest->u_threshold;
2573                         entry.l_threshold = dest->l_threshold;
2574                         entry.activeconns = atomic_read(&dest->activeconns);
2575                         entry.inactconns = atomic_read(&dest->inactconns);
2576                         entry.persistconns = atomic_read(&dest->persistconns);
2577                         ip_vs_copy_stats(&entry.stats, &dest->stats);
2578                         if (copy_to_user(&uptr->entrytable[count],
2579                                          &entry, sizeof(entry))) {
2580                                 ret = -EFAULT;
2581                                 break;
2582                         }
2583                         count++;
2584                 }
2585         } else
2586                 ret = -ESRCH;
2587         return ret;
2588 }
2589
2590 static inline void
2591 __ip_vs_get_timeouts(struct net *net, struct ip_vs_timeout_user *u)
2592 {
2593 #if defined(CONFIG_IP_VS_PROTO_TCP) || defined(CONFIG_IP_VS_PROTO_UDP)
2594         struct ip_vs_proto_data *pd;
2595 #endif
2596
2597         memset(u, 0, sizeof (*u));
2598
2599 #ifdef CONFIG_IP_VS_PROTO_TCP
2600         pd = ip_vs_proto_data_get(net, IPPROTO_TCP);
2601         u->tcp_timeout = pd->timeout_table[IP_VS_TCP_S_ESTABLISHED] / HZ;
2602         u->tcp_fin_timeout = pd->timeout_table[IP_VS_TCP_S_FIN_WAIT] / HZ;
2603 #endif
2604 #ifdef CONFIG_IP_VS_PROTO_UDP
2605         pd = ip_vs_proto_data_get(net, IPPROTO_UDP);
2606         u->udp_timeout =
2607                         pd->timeout_table[IP_VS_UDP_S_NORMAL] / HZ;
2608 #endif
2609 }
2610
2611
2612 #define GET_CMDID(cmd)          (cmd - IP_VS_BASE_CTL)
2613 #define GET_INFO_ARG_LEN        (sizeof(struct ip_vs_getinfo))
2614 #define GET_SERVICES_ARG_LEN    (sizeof(struct ip_vs_get_services))
2615 #define GET_SERVICE_ARG_LEN     (sizeof(struct ip_vs_service_entry))
2616 #define GET_DESTS_ARG_LEN       (sizeof(struct ip_vs_get_dests))
2617 #define GET_TIMEOUT_ARG_LEN     (sizeof(struct ip_vs_timeout_user))
2618 #define GET_DAEMON_ARG_LEN      (sizeof(struct ip_vs_daemon_user) * 2)
2619
2620 static const unsigned char get_arglen[GET_CMDID(IP_VS_SO_GET_MAX)+1] = {
2621         [GET_CMDID(IP_VS_SO_GET_VERSION)]       = 64,
2622         [GET_CMDID(IP_VS_SO_GET_INFO)]          = GET_INFO_ARG_LEN,
2623         [GET_CMDID(IP_VS_SO_GET_SERVICES)]      = GET_SERVICES_ARG_LEN,
2624         [GET_CMDID(IP_VS_SO_GET_SERVICE)]       = GET_SERVICE_ARG_LEN,
2625         [GET_CMDID(IP_VS_SO_GET_DESTS)]         = GET_DESTS_ARG_LEN,
2626         [GET_CMDID(IP_VS_SO_GET_TIMEOUT)]       = GET_TIMEOUT_ARG_LEN,
2627         [GET_CMDID(IP_VS_SO_GET_DAEMON)]        = GET_DAEMON_ARG_LEN,
2628 };
2629
2630 static int
2631 do_ip_vs_get_ctl(struct sock *sk, int cmd, void __user *user, int *len)
2632 {
2633         unsigned char arg[128];
2634         int ret = 0;
2635         unsigned int copylen;
2636         struct net *net = sock_net(sk);
2637         struct netns_ipvs *ipvs = net_ipvs(net);
2638
2639         BUG_ON(!net);
2640         if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
2641                 return -EPERM;
2642
2643         if (cmd < IP_VS_BASE_CTL || cmd > IP_VS_SO_GET_MAX)
2644                 return -EINVAL;
2645
2646         if (*len < get_arglen[GET_CMDID(cmd)]) {
2647                 pr_err("get_ctl: len %u < %u\n",
2648                        *len, get_arglen[GET_CMDID(cmd)]);
2649                 return -EINVAL;
2650         }
2651
2652         copylen = get_arglen[GET_CMDID(cmd)];
2653         if (copylen > 128)
2654                 return -EINVAL;
2655
2656         if (copy_from_user(arg, user, copylen) != 0)
2657                 return -EFAULT;
2658         /*
2659          * Handle daemons first since it has its own locking
2660          */
2661         if (cmd == IP_VS_SO_GET_DAEMON) {
2662                 struct ip_vs_daemon_user d[2];
2663
2664                 memset(&d, 0, sizeof(d));
2665                 if (mutex_lock_interruptible(&ipvs->sync_mutex))
2666                         return -ERESTARTSYS;
2667
2668                 if (ipvs->sync_state & IP_VS_STATE_MASTER) {
2669                         d[0].state = IP_VS_STATE_MASTER;
2670                         strlcpy(d[0].mcast_ifn, ipvs->master_mcast_ifn,
2671                                 sizeof(d[0].mcast_ifn));
2672                         d[0].syncid = ipvs->master_syncid;
2673                 }
2674                 if (ipvs->sync_state & IP_VS_STATE_BACKUP) {
2675                         d[1].state = IP_VS_STATE_BACKUP;
2676                         strlcpy(d[1].mcast_ifn, ipvs->backup_mcast_ifn,
2677                                 sizeof(d[1].mcast_ifn));
2678                         d[1].syncid = ipvs->backup_syncid;
2679                 }
2680                 if (copy_to_user(user, &d, sizeof(d)) != 0)
2681                         ret = -EFAULT;
2682                 mutex_unlock(&ipvs->sync_mutex);
2683                 return ret;
2684         }
2685
2686         if (mutex_lock_interruptible(&__ip_vs_mutex))
2687                 return -ERESTARTSYS;
2688
2689         switch (cmd) {
2690         case IP_VS_SO_GET_VERSION:
2691         {
2692                 char buf[64];
2693
2694                 sprintf(buf, "IP Virtual Server version %d.%d.%d (size=%d)",
2695                         NVERSION(IP_VS_VERSION_CODE), ip_vs_conn_tab_size);
2696                 if (copy_to_user(user, buf, strlen(buf)+1) != 0) {
2697                         ret = -EFAULT;
2698                         goto out;
2699                 }
2700                 *len = strlen(buf)+1;
2701         }
2702         break;
2703
2704         case IP_VS_SO_GET_INFO:
2705         {
2706                 struct ip_vs_getinfo info;
2707                 info.version = IP_VS_VERSION_CODE;
2708                 info.size = ip_vs_conn_tab_size;
2709                 info.num_services = ipvs->num_services;
2710                 if (copy_to_user(user, &info, sizeof(info)) != 0)
2711                         ret = -EFAULT;
2712         }
2713         break;
2714
2715         case IP_VS_SO_GET_SERVICES:
2716         {
2717                 struct ip_vs_get_services *get;
2718                 int size;
2719
2720                 get = (struct ip_vs_get_services *)arg;
2721                 size = sizeof(*get) +
2722                         sizeof(struct ip_vs_service_entry) * get->num_services;
2723                 if (*len != size) {
2724                         pr_err("length: %u != %u\n", *len, size);
2725                         ret = -EINVAL;
2726                         goto out;
2727                 }
2728                 ret = __ip_vs_get_service_entries(net, get, user);
2729         }
2730         break;
2731
2732         case IP_VS_SO_GET_SERVICE:
2733         {
2734                 struct ip_vs_service_entry *entry;
2735                 struct ip_vs_service *svc;
2736                 union nf_inet_addr addr;
2737
2738                 entry = (struct ip_vs_service_entry *)arg;
2739                 addr.ip = entry->addr;
2740                 rcu_read_lock();
2741                 if (entry->fwmark)
2742                         svc = __ip_vs_svc_fwm_find(net, AF_INET, entry->fwmark);
2743                 else
2744                         svc = __ip_vs_service_find(net, AF_INET,
2745                                                    entry->protocol, &addr,
2746                                                    entry->port);
2747                 rcu_read_unlock();
2748                 if (svc) {
2749                         ip_vs_copy_service(entry, svc);
2750                         if (copy_to_user(user, entry, sizeof(*entry)) != 0)
2751                                 ret = -EFAULT;
2752                 } else
2753                         ret = -ESRCH;
2754         }
2755         break;
2756
2757         case IP_VS_SO_GET_DESTS:
2758         {
2759                 struct ip_vs_get_dests *get;
2760                 int size;
2761
2762                 get = (struct ip_vs_get_dests *)arg;
2763                 size = sizeof(*get) +
2764                         sizeof(struct ip_vs_dest_entry) * get->num_dests;
2765                 if (*len != size) {
2766                         pr_err("length: %u != %u\n", *len, size);
2767                         ret = -EINVAL;
2768                         goto out;
2769                 }
2770                 ret = __ip_vs_get_dest_entries(net, get, user);
2771         }
2772         break;
2773
2774         case IP_VS_SO_GET_TIMEOUT:
2775         {
2776                 struct ip_vs_timeout_user t;
2777
2778                 __ip_vs_get_timeouts(net, &t);
2779                 if (copy_to_user(user, &t, sizeof(t)) != 0)
2780                         ret = -EFAULT;
2781         }
2782         break;
2783
2784         default:
2785                 ret = -EINVAL;
2786         }
2787
2788 out:
2789         mutex_unlock(&__ip_vs_mutex);
2790         return ret;
2791 }
2792
2793
2794 static struct nf_sockopt_ops ip_vs_sockopts = {
2795         .pf             = PF_INET,
2796         .set_optmin     = IP_VS_BASE_CTL,
2797         .set_optmax     = IP_VS_SO_SET_MAX+1,
2798         .set            = do_ip_vs_set_ctl,
2799         .get_optmin     = IP_VS_BASE_CTL,
2800         .get_optmax     = IP_VS_SO_GET_MAX+1,
2801         .get            = do_ip_vs_get_ctl,
2802         .owner          = THIS_MODULE,
2803 };
2804
2805 /*
2806  * Generic Netlink interface
2807  */
2808
2809 /* IPVS genetlink family */
2810 static struct genl_family ip_vs_genl_family = {
2811         .id             = GENL_ID_GENERATE,
2812         .hdrsize        = 0,
2813         .name           = IPVS_GENL_NAME,
2814         .version        = IPVS_GENL_VERSION,
2815         .maxattr        = IPVS_CMD_MAX,
2816         .netnsok        = true,         /* Make ipvsadm to work on netns */
2817 };
2818
2819 /* Policy used for first-level command attributes */
2820 static const struct nla_policy ip_vs_cmd_policy[IPVS_CMD_ATTR_MAX + 1] = {
2821         [IPVS_CMD_ATTR_SERVICE]         = { .type = NLA_NESTED },
2822         [IPVS_CMD_ATTR_DEST]            = { .type = NLA_NESTED },
2823         [IPVS_CMD_ATTR_DAEMON]          = { .type = NLA_NESTED },
2824         [IPVS_CMD_ATTR_TIMEOUT_TCP]     = { .type = NLA_U32 },
2825         [IPVS_CMD_ATTR_TIMEOUT_TCP_FIN] = { .type = NLA_U32 },
2826         [IPVS_CMD_ATTR_TIMEOUT_UDP]     = { .type = NLA_U32 },
2827 };
2828
2829 /* Policy used for attributes in nested attribute IPVS_CMD_ATTR_DAEMON */
2830 static const struct nla_policy ip_vs_daemon_policy[IPVS_DAEMON_ATTR_MAX + 1] = {
2831         [IPVS_DAEMON_ATTR_STATE]        = { .type = NLA_U32 },
2832         [IPVS_DAEMON_ATTR_MCAST_IFN]    = { .type = NLA_NUL_STRING,
2833                                             .len = IP_VS_IFNAME_MAXLEN },
2834         [IPVS_DAEMON_ATTR_SYNC_ID]      = { .type = NLA_U32 },
2835 };
2836
2837 /* Policy used for attributes in nested attribute IPVS_CMD_ATTR_SERVICE */
2838 static const struct nla_policy ip_vs_svc_policy[IPVS_SVC_ATTR_MAX + 1] = {
2839         [IPVS_SVC_ATTR_AF]              = { .type = NLA_U16 },
2840         [IPVS_SVC_ATTR_PROTOCOL]        = { .type = NLA_U16 },
2841         [IPVS_SVC_ATTR_ADDR]            = { .type = NLA_BINARY,
2842                                             .len = sizeof(union nf_inet_addr) },
2843         [IPVS_SVC_ATTR_PORT]            = { .type = NLA_U16 },
2844         [IPVS_SVC_ATTR_FWMARK]          = { .type = NLA_U32 },
2845         [IPVS_SVC_ATTR_SCHED_NAME]      = { .type = NLA_NUL_STRING,
2846                                             .len = IP_VS_SCHEDNAME_MAXLEN },
2847         [IPVS_SVC_ATTR_PE_NAME]         = { .type = NLA_NUL_STRING,
2848                                             .len = IP_VS_PENAME_MAXLEN },
2849         [IPVS_SVC_ATTR_FLAGS]           = { .type = NLA_BINARY,
2850                                             .len = sizeof(struct ip_vs_flags) },
2851         [IPVS_SVC_ATTR_TIMEOUT]         = { .type = NLA_U32 },
2852         [IPVS_SVC_ATTR_NETMASK]         = { .type = NLA_U32 },
2853         [IPVS_SVC_ATTR_STATS]           = { .type = NLA_NESTED },
2854 };
2855
2856 /* Policy used for attributes in nested attribute IPVS_CMD_ATTR_DEST */
2857 static const struct nla_policy ip_vs_dest_policy[IPVS_DEST_ATTR_MAX + 1] = {
2858         [IPVS_DEST_ATTR_ADDR]           = { .type = NLA_BINARY,
2859                                             .len = sizeof(union nf_inet_addr) },
2860         [IPVS_DEST_ATTR_PORT]           = { .type = NLA_U16 },
2861         [IPVS_DEST_ATTR_FWD_METHOD]     = { .type = NLA_U32 },
2862         [IPVS_DEST_ATTR_WEIGHT]         = { .type = NLA_U32 },
2863         [IPVS_DEST_ATTR_U_THRESH]       = { .type = NLA_U32 },
2864         [IPVS_DEST_ATTR_L_THRESH]       = { .type = NLA_U32 },
2865         [IPVS_DEST_ATTR_ACTIVE_CONNS]   = { .type = NLA_U32 },
2866         [IPVS_DEST_ATTR_INACT_CONNS]    = { .type = NLA_U32 },
2867         [IPVS_DEST_ATTR_PERSIST_CONNS]  = { .type = NLA_U32 },
2868         [IPVS_DEST_ATTR_STATS]          = { .type = NLA_NESTED },
2869 };
2870
2871 static int ip_vs_genl_fill_stats(struct sk_buff *skb, int container_type,
2872                                  struct ip_vs_stats *stats)
2873 {
2874         struct ip_vs_stats_user ustats;
2875         struct nlattr *nl_stats = nla_nest_start(skb, container_type);
2876         if (!nl_stats)
2877                 return -EMSGSIZE;
2878
2879         ip_vs_copy_stats(&ustats, stats);
2880
2881         if (nla_put_u32(skb, IPVS_STATS_ATTR_CONNS, ustats.conns) ||
2882             nla_put_u32(skb, IPVS_STATS_ATTR_INPKTS, ustats.inpkts) ||
2883             nla_put_u32(skb, IPVS_STATS_ATTR_OUTPKTS, ustats.outpkts) ||
2884             nla_put_u64(skb, IPVS_STATS_ATTR_INBYTES, ustats.inbytes) ||
2885             nla_put_u64(skb, IPVS_STATS_ATTR_OUTBYTES, ustats.outbytes) ||
2886             nla_put_u32(skb, IPVS_STATS_ATTR_CPS, ustats.cps) ||
2887             nla_put_u32(skb, IPVS_STATS_ATTR_INPPS, ustats.inpps) ||
2888             nla_put_u32(skb, IPVS_STATS_ATTR_OUTPPS, ustats.outpps) ||
2889             nla_put_u32(skb, IPVS_STATS_ATTR_INBPS, ustats.inbps) ||
2890             nla_put_u32(skb, IPVS_STATS_ATTR_OUTBPS, ustats.outbps))
2891                 goto nla_put_failure;
2892         nla_nest_end(skb, nl_stats);
2893
2894         return 0;
2895
2896 nla_put_failure:
2897         nla_nest_cancel(skb, nl_stats);
2898         return -EMSGSIZE;
2899 }
2900
2901 static int ip_vs_genl_fill_service(struct sk_buff *skb,
2902                                    struct ip_vs_service *svc)
2903 {
2904         struct ip_vs_scheduler *sched;
2905         struct ip_vs_pe *pe;
2906         struct nlattr *nl_service;
2907         struct ip_vs_flags flags = { .flags = svc->flags,
2908                                      .mask = ~0 };
2909
2910         nl_service = nla_nest_start(skb, IPVS_CMD_ATTR_SERVICE);
2911         if (!nl_service)
2912                 return -EMSGSIZE;
2913
2914         if (nla_put_u16(skb, IPVS_SVC_ATTR_AF, svc->af))
2915                 goto nla_put_failure;
2916         if (svc->fwmark) {
2917                 if (nla_put_u32(skb, IPVS_SVC_ATTR_FWMARK, svc->fwmark))
2918                         goto nla_put_failure;
2919         } else {
2920                 if (nla_put_u16(skb, IPVS_SVC_ATTR_PROTOCOL, svc->protocol) ||
2921                     nla_put(skb, IPVS_SVC_ATTR_ADDR, sizeof(svc->addr), &svc->addr) ||
2922                     nla_put_be16(skb, IPVS_SVC_ATTR_PORT, svc->port))
2923                         goto nla_put_failure;
2924         }
2925
2926         sched = rcu_dereference_protected(svc->scheduler, 1);
2927         pe = rcu_dereference_protected(svc->pe, 1);
2928         if (nla_put_string(skb, IPVS_SVC_ATTR_SCHED_NAME, sched->name) ||
2929             (pe && nla_put_string(skb, IPVS_SVC_ATTR_PE_NAME, pe->name)) ||
2930             nla_put(skb, IPVS_SVC_ATTR_FLAGS, sizeof(flags), &flags) ||
2931             nla_put_u32(skb, IPVS_SVC_ATTR_TIMEOUT, svc->timeout / HZ) ||
2932             nla_put_be32(skb, IPVS_SVC_ATTR_NETMASK, svc->netmask))
2933                 goto nla_put_failure;
2934         if (ip_vs_genl_fill_stats(skb, IPVS_SVC_ATTR_STATS, &svc->stats))
2935                 goto nla_put_failure;
2936
2937         nla_nest_end(skb, nl_service);
2938
2939         return 0;
2940
2941 nla_put_failure:
2942         nla_nest_cancel(skb, nl_service);
2943         return -EMSGSIZE;
2944 }
2945
2946 static int ip_vs_genl_dump_service(struct sk_buff *skb,
2947                                    struct ip_vs_service *svc,
2948                                    struct netlink_callback *cb)
2949 {
2950         void *hdr;
2951
2952         hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
2953                           &ip_vs_genl_family, NLM_F_MULTI,
2954                           IPVS_CMD_NEW_SERVICE);
2955         if (!hdr)
2956                 return -EMSGSIZE;
2957
2958         if (ip_vs_genl_fill_service(skb, svc) < 0)
2959                 goto nla_put_failure;
2960
2961         return genlmsg_end(skb, hdr);
2962
2963 nla_put_failure:
2964         genlmsg_cancel(skb, hdr);
2965         return -EMSGSIZE;
2966 }
2967
2968 static int ip_vs_genl_dump_services(struct sk_buff *skb,
2969                                     struct netlink_callback *cb)
2970 {
2971         int idx = 0, i;
2972         int start = cb->args[0];
2973         struct ip_vs_service *svc;
2974         struct net *net = skb_sknet(skb);
2975
2976         mutex_lock(&__ip_vs_mutex);
2977         for (i = 0; i < IP_VS_SVC_TAB_SIZE; i++) {
2978                 hlist_for_each_entry(svc, &ip_vs_svc_table[i], s_list) {
2979                         if (++idx <= start || !net_eq(svc->net, net))
2980                                 continue;
2981                         if (ip_vs_genl_dump_service(skb, svc, cb) < 0) {
2982                                 idx--;
2983                                 goto nla_put_failure;
2984                         }
2985                 }
2986         }
2987
2988         for (i = 0; i < IP_VS_SVC_TAB_SIZE; i++) {
2989                 hlist_for_each_entry(svc, &ip_vs_svc_fwm_table[i], f_list) {
2990                         if (++idx <= start || !net_eq(svc->net, net))
2991                                 continue;
2992                         if (ip_vs_genl_dump_service(skb, svc, cb) < 0) {
2993                                 idx--;
2994                                 goto nla_put_failure;
2995                         }
2996                 }
2997         }
2998
2999 nla_put_failure:
3000         mutex_unlock(&__ip_vs_mutex);
3001         cb->args[0] = idx;
3002
3003         return skb->len;
3004 }
3005
3006 static int ip_vs_genl_parse_service(struct net *net,
3007                                     struct ip_vs_service_user_kern *usvc,
3008                                     struct nlattr *nla, int full_entry,
3009                                     struct ip_vs_service **ret_svc)
3010 {
3011         struct nlattr *attrs[IPVS_SVC_ATTR_MAX + 1];
3012         struct nlattr *nla_af, *nla_port, *nla_fwmark, *nla_protocol, *nla_addr;
3013         struct ip_vs_service *svc;
3014
3015         /* Parse mandatory identifying service fields first */
3016         if (nla == NULL ||
3017             nla_parse_nested(attrs, IPVS_SVC_ATTR_MAX, nla, ip_vs_svc_policy))
3018                 return -EINVAL;
3019
3020         nla_af          = attrs[IPVS_SVC_ATTR_AF];
3021         nla_protocol    = attrs[IPVS_SVC_ATTR_PROTOCOL];
3022         nla_addr        = attrs[IPVS_SVC_ATTR_ADDR];
3023         nla_port        = attrs[IPVS_SVC_ATTR_PORT];
3024         nla_fwmark      = attrs[IPVS_SVC_ATTR_FWMARK];
3025
3026         if (!(nla_af && (nla_fwmark || (nla_port && nla_protocol && nla_addr))))
3027                 return -EINVAL;
3028
3029         memset(usvc, 0, sizeof(*usvc));
3030
3031         usvc->af = nla_get_u16(nla_af);
3032 #ifdef CONFIG_IP_VS_IPV6
3033         if (usvc->af != AF_INET && usvc->af != AF_INET6)
3034 #else
3035         if (usvc->af != AF_INET)
3036 #endif
3037                 return -EAFNOSUPPORT;
3038
3039         if (nla_fwmark) {
3040                 usvc->protocol = IPPROTO_TCP;
3041                 usvc->fwmark = nla_get_u32(nla_fwmark);
3042         } else {
3043                 usvc->protocol = nla_get_u16(nla_protocol);
3044                 nla_memcpy(&usvc->addr, nla_addr, sizeof(usvc->addr));
3045                 usvc->port = nla_get_be16(nla_port);
3046                 usvc->fwmark = 0;
3047         }
3048
3049         rcu_read_lock();
3050         if (usvc->fwmark)
3051                 svc = __ip_vs_svc_fwm_find(net, usvc->af, usvc->fwmark);
3052         else
3053                 svc = __ip_vs_service_find(net, usvc->af, usvc->protocol,
3054                                            &usvc->addr, usvc->port);
3055         rcu_read_unlock();
3056         *ret_svc = svc;
3057
3058         /* If a full entry was requested, check for the additional fields */
3059         if (full_entry) {
3060                 struct nlattr *nla_sched, *nla_flags, *nla_pe, *nla_timeout,
3061                               *nla_netmask;
3062                 struct ip_vs_flags flags;
3063
3064                 nla_sched = attrs[IPVS_SVC_ATTR_SCHED_NAME];
3065                 nla_pe = attrs[IPVS_SVC_ATTR_PE_NAME];
3066                 nla_flags = attrs[IPVS_SVC_ATTR_FLAGS];
3067                 nla_timeout = attrs[IPVS_SVC_ATTR_TIMEOUT];
3068                 nla_netmask = attrs[IPVS_SVC_ATTR_NETMASK];
3069
3070                 if (!(nla_sched && nla_flags && nla_timeout && nla_netmask))
3071                         return -EINVAL;
3072
3073                 nla_memcpy(&flags, nla_flags, sizeof(flags));
3074
3075                 /* prefill flags from service if it already exists */
3076                 if (svc)
3077                         usvc->flags = svc->flags;
3078
3079                 /* set new flags from userland */
3080                 usvc->flags = (usvc->flags & ~flags.mask) |
3081                               (flags.flags & flags.mask);
3082                 usvc->sched_name = nla_data(nla_sched);
3083                 usvc->pe_name = nla_pe ? nla_data(nla_pe) : NULL;
3084                 usvc->timeout = nla_get_u32(nla_timeout);
3085                 usvc->netmask = nla_get_be32(nla_netmask);
3086         }
3087
3088         return 0;
3089 }
3090
3091 static struct ip_vs_service *ip_vs_genl_find_service(struct net *net,
3092                                                      struct nlattr *nla)
3093 {
3094         struct ip_vs_service_user_kern usvc;
3095         struct ip_vs_service *svc;
3096         int ret;
3097
3098         ret = ip_vs_genl_parse_service(net, &usvc, nla, 0, &svc);
3099         return ret ? ERR_PTR(ret) : svc;
3100 }
3101
3102 static int ip_vs_genl_fill_dest(struct sk_buff *skb, struct ip_vs_dest *dest)
3103 {
3104         struct nlattr *nl_dest;
3105
3106         nl_dest = nla_nest_start(skb, IPVS_CMD_ATTR_DEST);
3107         if (!nl_dest)
3108                 return -EMSGSIZE;
3109
3110         if (nla_put(skb, IPVS_DEST_ATTR_ADDR, sizeof(dest->addr), &dest->addr) ||
3111             nla_put_be16(skb, IPVS_DEST_ATTR_PORT, dest->port) ||
3112             nla_put_u32(skb, IPVS_DEST_ATTR_FWD_METHOD,
3113                         (atomic_read(&dest->conn_flags) &
3114                          IP_VS_CONN_F_FWD_MASK)) ||
3115             nla_put_u32(skb, IPVS_DEST_ATTR_WEIGHT,
3116                         atomic_read(&dest->weight)) ||
3117             nla_put_u32(skb, IPVS_DEST_ATTR_U_THRESH, dest->u_threshold) ||
3118             nla_put_u32(skb, IPVS_DEST_ATTR_L_THRESH, dest->l_threshold) ||
3119             nla_put_u32(skb, IPVS_DEST_ATTR_ACTIVE_CONNS,
3120                         atomic_read(&dest->activeconns)) ||
3121             nla_put_u32(skb, IPVS_DEST_ATTR_INACT_CONNS,
3122                         atomic_read(&dest->inactconns)) ||
3123             nla_put_u32(skb, IPVS_DEST_ATTR_PERSIST_CONNS,
3124                         atomic_read(&dest->persistconns)))
3125                 goto nla_put_failure;
3126         if (ip_vs_genl_fill_stats(skb, IPVS_DEST_ATTR_STATS, &dest->stats))
3127                 goto nla_put_failure;
3128
3129         nla_nest_end(skb, nl_dest);
3130
3131         return 0;
3132
3133 nla_put_failure:
3134         nla_nest_cancel(skb, nl_dest);
3135         return -EMSGSIZE;
3136 }
3137
3138 static int ip_vs_genl_dump_dest(struct sk_buff *skb, struct ip_vs_dest *dest,
3139                                 struct netlink_callback *cb)
3140 {
3141         void *hdr;
3142
3143         hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
3144                           &ip_vs_genl_family, NLM_F_MULTI,
3145                           IPVS_CMD_NEW_DEST);
3146         if (!hdr)
3147                 return -EMSGSIZE;
3148
3149         if (ip_vs_genl_fill_dest(skb, dest) < 0)
3150                 goto nla_put_failure;
3151
3152         return genlmsg_end(skb, hdr);
3153
3154 nla_put_failure:
3155         genlmsg_cancel(skb, hdr);
3156         return -EMSGSIZE;
3157 }
3158
3159 static int ip_vs_genl_dump_dests(struct sk_buff *skb,
3160                                  struct netlink_callback *cb)
3161 {
3162         int idx = 0;
3163         int start = cb->args[0];
3164         struct ip_vs_service *svc;
3165         struct ip_vs_dest *dest;
3166         struct nlattr *attrs[IPVS_CMD_ATTR_MAX + 1];
3167         struct net *net = skb_sknet(skb);
3168
3169         mutex_lock(&__ip_vs_mutex);
3170
3171         /* Try to find the service for which to dump destinations */
3172         if (nlmsg_parse(cb->nlh, GENL_HDRLEN, attrs,
3173                         IPVS_CMD_ATTR_MAX, ip_vs_cmd_policy))
3174                 goto out_err;
3175
3176
3177         svc = ip_vs_genl_find_service(net, attrs[IPVS_CMD_ATTR_SERVICE]);
3178         if (IS_ERR(svc) || svc == NULL)
3179                 goto out_err;
3180
3181         /* Dump the destinations */
3182         list_for_each_entry(dest, &svc->destinations, n_list) {
3183                 if (++idx <= start)
3184                         continue;
3185                 if (ip_vs_genl_dump_dest(skb, dest, cb) < 0) {
3186                         idx--;
3187                         goto nla_put_failure;
3188                 }
3189         }
3190
3191 nla_put_failure:
3192         cb->args[0] = idx;
3193
3194 out_err:
3195         mutex_unlock(&__ip_vs_mutex);
3196
3197         return skb->len;
3198 }
3199
3200 static int ip_vs_genl_parse_dest(struct ip_vs_dest_user_kern *udest,
3201                                  struct nlattr *nla, int full_entry)
3202 {
3203         struct nlattr *attrs[IPVS_DEST_ATTR_MAX + 1];
3204         struct nlattr *nla_addr, *nla_port;
3205
3206         /* Parse mandatory identifying destination fields first */
3207         if (nla == NULL ||
3208             nla_parse_nested(attrs, IPVS_DEST_ATTR_MAX, nla, ip_vs_dest_policy))
3209                 return -EINVAL;
3210
3211         nla_addr        = attrs[IPVS_DEST_ATTR_ADDR];
3212         nla_port        = attrs[IPVS_DEST_ATTR_PORT];
3213
3214         if (!(nla_addr && nla_port))
3215                 return -EINVAL;
3216
3217         memset(udest, 0, sizeof(*udest));
3218
3219         nla_memcpy(&udest->addr, nla_addr, sizeof(udest->addr));
3220         udest->port = nla_get_be16(nla_port);
3221
3222         /* If a full entry was requested, check for the additional fields */
3223         if (full_entry) {
3224                 struct nlattr *nla_fwd, *nla_weight, *nla_u_thresh,
3225                               *nla_l_thresh;
3226
3227                 nla_fwd         = attrs[IPVS_DEST_ATTR_FWD_METHOD];
3228                 nla_weight      = attrs[IPVS_DEST_ATTR_WEIGHT];
3229                 nla_u_thresh    = attrs[IPVS_DEST_ATTR_U_THRESH];
3230                 nla_l_thresh    = attrs[IPVS_DEST_ATTR_L_THRESH];
3231
3232                 if (!(nla_fwd && nla_weight && nla_u_thresh && nla_l_thresh))
3233                         return -EINVAL;
3234
3235                 udest->conn_flags = nla_get_u32(nla_fwd)
3236                                     & IP_VS_CONN_F_FWD_MASK;
3237                 udest->weight = nla_get_u32(nla_weight);
3238                 udest->u_threshold = nla_get_u32(nla_u_thresh);
3239                 udest->l_threshold = nla_get_u32(nla_l_thresh);
3240         }
3241
3242         return 0;
3243 }
3244
3245 static int ip_vs_genl_fill_daemon(struct sk_buff *skb, __u32 state,
3246                                   const char *mcast_ifn, __u32 syncid)
3247 {
3248         struct nlattr *nl_daemon;
3249
3250         nl_daemon = nla_nest_start(skb, IPVS_CMD_ATTR_DAEMON);
3251         if (!nl_daemon)
3252                 return -EMSGSIZE;
3253
3254         if (nla_put_u32(skb, IPVS_DAEMON_ATTR_STATE, state) ||
3255             nla_put_string(skb, IPVS_DAEMON_ATTR_MCAST_IFN, mcast_ifn) ||
3256             nla_put_u32(skb, IPVS_DAEMON_ATTR_SYNC_ID, syncid))
3257                 goto nla_put_failure;
3258         nla_nest_end(skb, nl_daemon);
3259
3260         return 0;
3261
3262 nla_put_failure:
3263         nla_nest_cancel(skb, nl_daemon);
3264         return -EMSGSIZE;
3265 }
3266
3267 static int ip_vs_genl_dump_daemon(struct sk_buff *skb, __u32 state,
3268                                   const char *mcast_ifn, __u32 syncid,
3269                                   struct netlink_callback *cb)
3270 {
3271         void *hdr;
3272         hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
3273                           &ip_vs_genl_family, NLM_F_MULTI,
3274                           IPVS_CMD_NEW_DAEMON);
3275         if (!hdr)
3276                 return -EMSGSIZE;
3277
3278         if (ip_vs_genl_fill_daemon(skb, state, mcast_ifn, syncid))
3279                 goto nla_put_failure;
3280
3281         return genlmsg_end(skb, hdr);
3282
3283 nla_put_failure:
3284         genlmsg_cancel(skb, hdr);
3285         return -EMSGSIZE;
3286 }
3287
3288 static int ip_vs_genl_dump_daemons(struct sk_buff *skb,
3289                                    struct netlink_callback *cb)
3290 {
3291         struct net *net = skb_sknet(skb);
3292         struct netns_ipvs *ipvs = net_ipvs(net);
3293
3294         mutex_lock(&ipvs->sync_mutex);
3295         if ((ipvs->sync_state & IP_VS_STATE_MASTER) && !cb->args[0]) {
3296                 if (ip_vs_genl_dump_daemon(skb, IP_VS_STATE_MASTER,
3297                                            ipvs->master_mcast_ifn,
3298                                            ipvs->master_syncid, cb) < 0)
3299                         goto nla_put_failure;
3300
3301                 cb->args[0] = 1;
3302         }
3303
3304         if ((ipvs->sync_state & IP_VS_STATE_BACKUP) && !cb->args[1]) {
3305                 if (ip_vs_genl_dump_daemon(skb, IP_VS_STATE_BACKUP,
3306                                            ipvs->backup_mcast_ifn,
3307                                            ipvs->backup_syncid, cb) < 0)
3308                         goto nla_put_failure;
3309
3310                 cb->args[1] = 1;
3311         }
3312
3313 nla_put_failure:
3314         mutex_unlock(&ipvs->sync_mutex);
3315
3316         return skb->len;
3317 }
3318
3319 static int ip_vs_genl_new_daemon(struct net *net, struct nlattr **attrs)
3320 {
3321         if (!(attrs[IPVS_DAEMON_ATTR_STATE] &&
3322               attrs[IPVS_DAEMON_ATTR_MCAST_IFN] &&
3323               attrs[IPVS_DAEMON_ATTR_SYNC_ID]))
3324                 return -EINVAL;
3325
3326         return start_sync_thread(net,
3327                                  nla_get_u32(attrs[IPVS_DAEMON_ATTR_STATE]),
3328                                  nla_data(attrs[IPVS_DAEMON_ATTR_MCAST_IFN]),
3329                                  nla_get_u32(attrs[IPVS_DAEMON_ATTR_SYNC_ID]));
3330 }
3331
3332 static int ip_vs_genl_del_daemon(struct net *net, struct nlattr **attrs)
3333 {
3334         if (!attrs[IPVS_DAEMON_ATTR_STATE])
3335                 return -EINVAL;
3336
3337         return stop_sync_thread(net,
3338                                 nla_get_u32(attrs[IPVS_DAEMON_ATTR_STATE]));
3339 }
3340
3341 static int ip_vs_genl_set_config(struct net *net, struct nlattr **attrs)
3342 {
3343         struct ip_vs_timeout_user t;
3344
3345         __ip_vs_get_timeouts(net, &t);
3346
3347         if (attrs[IPVS_CMD_ATTR_TIMEOUT_TCP])
3348                 t.tcp_timeout = nla_get_u32(attrs[IPVS_CMD_ATTR_TIMEOUT_TCP]);
3349
3350         if (attrs[IPVS_CMD_ATTR_TIMEOUT_TCP_FIN])
3351                 t.tcp_fin_timeout =
3352                         nla_get_u32(attrs[IPVS_CMD_ATTR_TIMEOUT_TCP_FIN]);
3353
3354         if (attrs[IPVS_CMD_ATTR_TIMEOUT_UDP])
3355                 t.udp_timeout = nla_get_u32(attrs[IPVS_CMD_ATTR_TIMEOUT_UDP]);
3356
3357         return ip_vs_set_timeout(net, &t);
3358 }
3359
3360 static int ip_vs_genl_set_daemon(struct sk_buff *skb, struct genl_info *info)
3361 {
3362         int ret = 0, cmd;
3363         struct net *net;
3364         struct netns_ipvs *ipvs;
3365
3366         net = skb_sknet(skb);
3367         ipvs = net_ipvs(net);
3368         cmd = info->genlhdr->cmd;
3369
3370         if (cmd == IPVS_CMD_NEW_DAEMON || cmd == IPVS_CMD_DEL_DAEMON) {
3371                 struct nlattr *daemon_attrs[IPVS_DAEMON_ATTR_MAX + 1];
3372
3373                 mutex_lock(&ipvs->sync_mutex);
3374                 if (!info->attrs[IPVS_CMD_ATTR_DAEMON] ||
3375                     nla_parse_nested(daemon_attrs, IPVS_DAEMON_ATTR_MAX,
3376                                      info->attrs[IPVS_CMD_ATTR_DAEMON],
3377                                      ip_vs_daemon_policy)) {
3378                         ret = -EINVAL;
3379                         goto out;
3380                 }
3381
3382                 if (cmd == IPVS_CMD_NEW_DAEMON)
3383                         ret = ip_vs_genl_new_daemon(net, daemon_attrs);
3384                 else
3385                         ret = ip_vs_genl_del_daemon(net, daemon_attrs);
3386 out:
3387                 mutex_unlock(&ipvs->sync_mutex);
3388         }
3389         return ret;
3390 }
3391
3392 static int ip_vs_genl_set_cmd(struct sk_buff *skb, struct genl_info *info)
3393 {
3394         struct ip_vs_service *svc = NULL;
3395         struct ip_vs_service_user_kern usvc;
3396         struct ip_vs_dest_user_kern udest;
3397         int ret = 0, cmd;
3398         int need_full_svc = 0, need_full_dest = 0;
3399         struct net *net;
3400
3401         net = skb_sknet(skb);
3402         cmd = info->genlhdr->cmd;
3403
3404         mutex_lock(&__ip_vs_mutex);
3405
3406         if (cmd == IPVS_CMD_FLUSH) {
3407                 ret = ip_vs_flush(net, false);
3408                 goto out;
3409         } else if (cmd == IPVS_CMD_SET_CONFIG) {
3410                 ret = ip_vs_genl_set_config(net, info->attrs);
3411                 goto out;
3412         } else if (cmd == IPVS_CMD_ZERO &&
3413                    !info->attrs[IPVS_CMD_ATTR_SERVICE]) {
3414                 ret = ip_vs_zero_all(net);
3415                 goto out;
3416         }
3417
3418         /* All following commands require a service argument, so check if we
3419          * received a valid one. We need a full service specification when
3420          * adding / editing a service. Only identifying members otherwise. */
3421         if (cmd == IPVS_CMD_NEW_SERVICE || cmd == IPVS_CMD_SET_SERVICE)
3422                 need_full_svc = 1;
3423
3424         ret = ip_vs_genl_parse_service(net, &usvc,
3425                                        info->attrs[IPVS_CMD_ATTR_SERVICE],
3426                                        need_full_svc, &svc);
3427         if (ret)
3428                 goto out;
3429
3430         /* Unless we're adding a new service, the service must already exist */
3431         if ((cmd != IPVS_CMD_NEW_SERVICE) && (svc == NULL)) {
3432                 ret = -ESRCH;
3433                 goto out;
3434         }
3435
3436         /* Destination commands require a valid destination argument. For
3437          * adding / editing a destination, we need a full destination
3438          * specification. */
3439         if (cmd == IPVS_CMD_NEW_DEST || cmd == IPVS_CMD_SET_DEST ||
3440             cmd == IPVS_CMD_DEL_DEST) {
3441                 if (cmd != IPVS_CMD_DEL_DEST)
3442                         need_full_dest = 1;
3443
3444                 ret = ip_vs_genl_parse_dest(&udest,
3445                                             info->attrs[IPVS_CMD_ATTR_DEST],
3446                                             need_full_dest);
3447                 if (ret)
3448                         goto out;
3449         }
3450
3451         switch (cmd) {
3452         case IPVS_CMD_NEW_SERVICE:
3453                 if (svc == NULL)
3454                         ret = ip_vs_add_service(net, &usvc, &svc);
3455                 else
3456                         ret = -EEXIST;
3457                 break;
3458         case IPVS_CMD_SET_SERVICE:
3459                 ret = ip_vs_edit_service(svc, &usvc);
3460                 break;
3461         case IPVS_CMD_DEL_SERVICE:
3462                 ret = ip_vs_del_service(svc);
3463                 /* do not use svc, it can be freed */
3464                 break;
3465         case IPVS_CMD_NEW_DEST:
3466                 ret = ip_vs_add_dest(svc, &udest);
3467                 break;
3468         case IPVS_CMD_SET_DEST:
3469                 ret = ip_vs_edit_dest(svc, &udest);
3470                 break;
3471         case IPVS_CMD_DEL_DEST:
3472                 ret = ip_vs_del_dest(svc, &udest);
3473                 break;
3474         case IPVS_CMD_ZERO:
3475                 ret = ip_vs_zero_service(svc);
3476                 break;
3477         default:
3478                 ret = -EINVAL;
3479         }
3480
3481 out:
3482         mutex_unlock(&__ip_vs_mutex);
3483
3484         return ret;
3485 }
3486
3487 static int ip_vs_genl_get_cmd(struct sk_buff *skb, struct genl_info *info)
3488 {
3489         struct sk_buff *msg;
3490         void *reply;
3491         int ret, cmd, reply_cmd;
3492         struct net *net;
3493
3494         net = skb_sknet(skb);
3495         cmd = info->genlhdr->cmd;
3496
3497         if (cmd == IPVS_CMD_GET_SERVICE)
3498                 reply_cmd = IPVS_CMD_NEW_SERVICE;
3499         else if (cmd == IPVS_CMD_GET_INFO)
3500                 reply_cmd = IPVS_CMD_SET_INFO;
3501         else if (cmd == IPVS_CMD_GET_CONFIG)
3502                 reply_cmd = IPVS_CMD_SET_CONFIG;
3503         else {
3504                 pr_err("unknown Generic Netlink command\n");
3505                 return -EINVAL;
3506         }
3507
3508         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
3509         if (!msg)
3510                 return -ENOMEM;
3511
3512         mutex_lock(&__ip_vs_mutex);
3513
3514         reply = genlmsg_put_reply(msg, info, &ip_vs_genl_family, 0, reply_cmd);
3515         if (reply == NULL)
3516                 goto nla_put_failure;
3517
3518         switch (cmd) {
3519         case IPVS_CMD_GET_SERVICE:
3520         {
3521                 struct ip_vs_service *svc;
3522
3523                 svc = ip_vs_genl_find_service(net,
3524                                               info->attrs[IPVS_CMD_ATTR_SERVICE]);
3525                 if (IS_ERR(svc)) {
3526                         ret = PTR_ERR(svc);
3527                         goto out_err;
3528                 } else if (svc) {
3529                         ret = ip_vs_genl_fill_service(msg, svc);
3530                         if (ret)
3531                                 goto nla_put_failure;
3532                 } else {
3533                         ret = -ESRCH;
3534                         goto out_err;
3535                 }
3536
3537                 break;
3538         }
3539
3540         case IPVS_CMD_GET_CONFIG:
3541         {
3542                 struct ip_vs_timeout_user t;
3543
3544                 __ip_vs_get_timeouts(net, &t);
3545 #ifdef CONFIG_IP_VS_PROTO_TCP
3546                 if (nla_put_u32(msg, IPVS_CMD_ATTR_TIMEOUT_TCP,
3547                                 t.tcp_timeout) ||
3548                     nla_put_u32(msg, IPVS_CMD_ATTR_TIMEOUT_TCP_FIN,
3549                                 t.tcp_fin_timeout))
3550                         goto nla_put_failure;
3551 #endif
3552 #ifdef CONFIG_IP_VS_PROTO_UDP
3553                 if (nla_put_u32(msg, IPVS_CMD_ATTR_TIMEOUT_UDP, t.udp_timeout))
3554                         goto nla_put_failure;
3555 #endif
3556
3557                 break;
3558         }
3559
3560         case IPVS_CMD_GET_INFO:
3561                 if (nla_put_u32(msg, IPVS_INFO_ATTR_VERSION,
3562                                 IP_VS_VERSION_CODE) ||
3563                     nla_put_u32(msg, IPVS_INFO_ATTR_CONN_TAB_SIZE,
3564                                 ip_vs_conn_tab_size))
3565                         goto nla_put_failure;
3566                 break;
3567         }
3568
3569         genlmsg_end(msg, reply);
3570         ret = genlmsg_reply(msg, info);
3571         goto out;
3572
3573 nla_put_failure:
3574         pr_err("not enough space in Netlink message\n");
3575         ret = -EMSGSIZE;
3576
3577 out_err:
3578         nlmsg_free(msg);
3579 out:
3580         mutex_unlock(&__ip_vs_mutex);
3581
3582         return ret;
3583 }
3584
3585
3586 static struct genl_ops ip_vs_genl_ops[] __read_mostly = {
3587         {
3588                 .cmd    = IPVS_CMD_NEW_SERVICE,
3589                 .flags  = GENL_ADMIN_PERM,
3590                 .policy = ip_vs_cmd_policy,
3591                 .doit   = ip_vs_genl_set_cmd,
3592         },
3593         {
3594                 .cmd    = IPVS_CMD_SET_SERVICE,
3595                 .flags  = GENL_ADMIN_PERM,
3596                 .policy = ip_vs_cmd_policy,
3597                 .doit   = ip_vs_genl_set_cmd,
3598         },
3599         {
3600                 .cmd    = IPVS_CMD_DEL_SERVICE,
3601                 .flags  = GENL_ADMIN_PERM,
3602                 .policy = ip_vs_cmd_policy,
3603                 .doit   = ip_vs_genl_set_cmd,
3604         },
3605         {
3606                 .cmd    = IPVS_CMD_GET_SERVICE,
3607                 .flags  = GENL_ADMIN_PERM,
3608                 .doit   = ip_vs_genl_get_cmd,
3609                 .dumpit = ip_vs_genl_dump_services,
3610                 .policy = ip_vs_cmd_policy,
3611         },
3612         {
3613                 .cmd    = IPVS_CMD_NEW_DEST,
3614                 .flags  = GENL_ADMIN_PERM,
3615                 .policy = ip_vs_cmd_policy,
3616                 .doit   = ip_vs_genl_set_cmd,
3617         },
3618         {
3619                 .cmd    = IPVS_CMD_SET_DEST,
3620                 .flags  = GENL_ADMIN_PERM,
3621                 .policy = ip_vs_cmd_policy,
3622                 .doit   = ip_vs_genl_set_cmd,
3623         },
3624         {
3625                 .cmd    = IPVS_CMD_DEL_DEST,
3626                 .flags  = GENL_ADMIN_PERM,
3627                 .policy = ip_vs_cmd_policy,
3628                 .doit   = ip_vs_genl_set_cmd,
3629         },
3630         {
3631                 .cmd    = IPVS_CMD_GET_DEST,
3632                 .flags  = GENL_ADMIN_PERM,
3633                 .policy = ip_vs_cmd_policy,
3634                 .dumpit = ip_vs_genl_dump_dests,
3635         },
3636         {
3637                 .cmd    = IPVS_CMD_NEW_DAEMON,
3638                 .flags  = GENL_ADMIN_PERM,
3639                 .policy = ip_vs_cmd_policy,
3640                 .doit   = ip_vs_genl_set_daemon,
3641         },
3642         {
3643                 .cmd    = IPVS_CMD_DEL_DAEMON,
3644                 .flags  = GENL_ADMIN_PERM,
3645                 .policy = ip_vs_cmd_policy,
3646                 .doit   = ip_vs_genl_set_daemon,
3647         },
3648         {
3649                 .cmd    = IPVS_CMD_GET_DAEMON,
3650                 .flags  = GENL_ADMIN_PERM,
3651                 .dumpit = ip_vs_genl_dump_daemons,
3652         },
3653         {
3654                 .cmd    = IPVS_CMD_SET_CONFIG,
3655                 .flags  = GENL_ADMIN_PERM,
3656                 .policy = ip_vs_cmd_policy,
3657                 .doit   = ip_vs_genl_set_cmd,
3658         },
3659         {
3660                 .cmd    = IPVS_CMD_GET_CONFIG,
3661                 .flags  = GENL_ADMIN_PERM,
3662                 .doit   = ip_vs_genl_get_cmd,
3663         },
3664         {
3665                 .cmd    = IPVS_CMD_GET_INFO,
3666                 .flags  = GENL_ADMIN_PERM,
3667                 .doit   = ip_vs_genl_get_cmd,
3668         },
3669         {
3670                 .cmd    = IPVS_CMD_ZERO,
3671                 .flags  = GENL_ADMIN_PERM,
3672                 .policy = ip_vs_cmd_policy,
3673                 .doit   = ip_vs_genl_set_cmd,
3674         },
3675         {
3676                 .cmd    = IPVS_CMD_FLUSH,
3677                 .flags  = GENL_ADMIN_PERM,
3678                 .doit   = ip_vs_genl_set_cmd,
3679         },
3680 };
3681
3682 static int __init ip_vs_genl_register(void)
3683 {
3684         return genl_register_family_with_ops(&ip_vs_genl_family,
3685                 ip_vs_genl_ops, ARRAY_SIZE(ip_vs_genl_ops));
3686 }
3687
3688 static void ip_vs_genl_unregister(void)
3689 {
3690         genl_unregister_family(&ip_vs_genl_family);
3691 }
3692
3693 /* End of Generic Netlink interface definitions */
3694
3695 /*
3696  * per netns intit/exit func.
3697  */
3698 #ifdef CONFIG_SYSCTL
3699 static int __net_init ip_vs_control_net_init_sysctl(struct net *net)
3700 {
3701         int idx;
3702         struct netns_ipvs *ipvs = net_ipvs(net);
3703         struct ctl_table *tbl;
3704
3705         atomic_set(&ipvs->dropentry, 0);
3706         spin_lock_init(&ipvs->dropentry_lock);
3707         spin_lock_init(&ipvs->droppacket_lock);
3708         spin_lock_init(&ipvs->securetcp_lock);
3709
3710         if (!net_eq(net, &init_net)) {
3711                 tbl = kmemdup(vs_vars, sizeof(vs_vars), GFP_KERNEL);
3712                 if (tbl == NULL)
3713                         return -ENOMEM;
3714
3715                 /* Don't export sysctls to unprivileged users */
3716                 if (net->user_ns != &init_user_ns)
3717                         tbl[0].procname = NULL;
3718         } else
3719                 tbl = vs_vars;
3720         /* Initialize sysctl defaults */
3721         idx = 0;
3722         ipvs->sysctl_amemthresh = 1024;
3723         tbl[idx++].data = &ipvs->sysctl_amemthresh;
3724         ipvs->sysctl_am_droprate = 10;
3725         tbl[idx++].data = &ipvs->sysctl_am_droprate;
3726         tbl[idx++].data = &ipvs->sysctl_drop_entry;
3727         tbl[idx++].data = &ipvs->sysctl_drop_packet;
3728 #ifdef CONFIG_IP_VS_NFCT
3729         tbl[idx++].data = &ipvs->sysctl_conntrack;
3730 #endif
3731         tbl[idx++].data = &ipvs->sysctl_secure_tcp;
3732         ipvs->sysctl_snat_reroute = 1;
3733         tbl[idx++].data = &ipvs->sysctl_snat_reroute;
3734         ipvs->sysctl_sync_ver = 1;
3735         tbl[idx++].data = &ipvs->sysctl_sync_ver;
3736         ipvs->sysctl_sync_ports = 1;
3737         tbl[idx++].data = &ipvs->sysctl_sync_ports;
3738         tbl[idx++].data = &ipvs->sysctl_sync_persist_mode;
3739         ipvs->sysctl_sync_qlen_max = nr_free_buffer_pages() / 32;
3740         tbl[idx++].data = &ipvs->sysctl_sync_qlen_max;
3741         ipvs->sysctl_sync_sock_size = 0;
3742         tbl[idx++].data = &ipvs->sysctl_sync_sock_size;
3743         tbl[idx++].data = &ipvs->sysctl_cache_bypass;
3744         tbl[idx++].data = &ipvs->sysctl_expire_nodest_conn;
3745         tbl[idx++].data = &ipvs->sysctl_sloppy_tcp;
3746         tbl[idx++].data = &ipvs->sysctl_sloppy_sctp;
3747         tbl[idx++].data = &ipvs->sysctl_expire_quiescent_template;
3748         ipvs->sysctl_sync_threshold[0] = DEFAULT_SYNC_THRESHOLD;
3749         ipvs->sysctl_sync_threshold[1] = DEFAULT_SYNC_PERIOD;
3750         tbl[idx].data = &ipvs->sysctl_sync_threshold;
3751         tbl[idx++].maxlen = sizeof(ipvs->sysctl_sync_threshold);
3752         ipvs->sysctl_sync_refresh_period = DEFAULT_SYNC_REFRESH_PERIOD;
3753         tbl[idx++].data = &ipvs->sysctl_sync_refresh_period;
3754         ipvs->sysctl_sync_retries = clamp_t(int, DEFAULT_SYNC_RETRIES, 0, 3);
3755         tbl[idx++].data = &ipvs->sysctl_sync_retries;
3756         tbl[idx++].data = &ipvs->sysctl_nat_icmp_send;
3757         ipvs->sysctl_pmtu_disc = 1;
3758         tbl[idx++].data = &ipvs->sysctl_pmtu_disc;
3759         tbl[idx++].data = &ipvs->sysctl_backup_only;
3760
3761
3762         ipvs->sysctl_hdr = register_net_sysctl(net, "net/ipv4/vs", tbl);
3763         if (ipvs->sysctl_hdr == NULL) {
3764                 if (!net_eq(net, &init_net))
3765                         kfree(tbl);
3766                 return -ENOMEM;
3767         }
3768         ip_vs_start_estimator(net, &ipvs->tot_stats);
3769         ipvs->sysctl_tbl = tbl;
3770         /* Schedule defense work */
3771         INIT_DELAYED_WORK(&ipvs->defense_work, defense_work_handler);
3772         schedule_delayed_work(&ipvs->defense_work, DEFENSE_TIMER_PERIOD);
3773
3774         return 0;
3775 }
3776
3777 static void __net_exit ip_vs_control_net_cleanup_sysctl(struct net *net)
3778 {
3779         struct netns_ipvs *ipvs = net_ipvs(net);
3780
3781         cancel_delayed_work_sync(&ipvs->defense_work);
3782         cancel_work_sync(&ipvs->defense_work.work);
3783         unregister_net_sysctl_table(ipvs->sysctl_hdr);
3784 }
3785
3786 #else
3787
3788 static int __net_init ip_vs_control_net_init_sysctl(struct net *net) { return 0; }
3789 static void __net_exit ip_vs_control_net_cleanup_sysctl(struct net *net) { }
3790
3791 #endif
3792
3793 static struct notifier_block ip_vs_dst_notifier = {
3794         .notifier_call = ip_vs_dst_event,
3795 };
3796
3797 int __net_init ip_vs_control_net_init(struct net *net)
3798 {
3799         int idx;
3800         struct netns_ipvs *ipvs = net_ipvs(net);
3801
3802         /* Initialize rs_table */
3803         for (idx = 0; idx < IP_VS_RTAB_SIZE; idx++)
3804                 INIT_HLIST_HEAD(&ipvs->rs_table[idx]);
3805
3806         INIT_LIST_HEAD(&ipvs->dest_trash);
3807         spin_lock_init(&ipvs->dest_trash_lock);
3808         setup_timer(&ipvs->dest_trash_timer, ip_vs_dest_trash_expire,
3809                     (unsigned long) net);
3810         atomic_set(&ipvs->ftpsvc_counter, 0);
3811         atomic_set(&ipvs->nullsvc_counter, 0);
3812
3813         /* procfs stats */
3814         ipvs->tot_stats.cpustats = alloc_percpu(struct ip_vs_cpu_stats);
3815         if (!ipvs->tot_stats.cpustats)
3816                 return -ENOMEM;
3817
3818         spin_lock_init(&ipvs->tot_stats.lock);
3819
3820         proc_create("ip_vs", 0, net->proc_net, &ip_vs_info_fops);
3821         proc_create("ip_vs_stats", 0, net->proc_net, &ip_vs_stats_fops);
3822         proc_create("ip_vs_stats_percpu", 0, net->proc_net,
3823                     &ip_vs_stats_percpu_fops);
3824
3825         if (ip_vs_control_net_init_sysctl(net))
3826                 goto err;
3827
3828         return 0;
3829
3830 err:
3831         free_percpu(ipvs->tot_stats.cpustats);
3832         return -ENOMEM;
3833 }
3834
3835 void __net_exit ip_vs_control_net_cleanup(struct net *net)
3836 {
3837         struct netns_ipvs *ipvs = net_ipvs(net);
3838
3839         /* Some dest can be in grace period even before cleanup, we have to
3840          * defer ip_vs_trash_cleanup until ip_vs_dest_wait_readers is called.
3841          */
3842         rcu_barrier();
3843         ip_vs_trash_cleanup(net);
3844         ip_vs_stop_estimator(net, &ipvs->tot_stats);
3845         ip_vs_control_net_cleanup_sysctl(net);
3846         remove_proc_entry("ip_vs_stats_percpu", net->proc_net);
3847         remove_proc_entry("ip_vs_stats", net->proc_net);
3848         remove_proc_entry("ip_vs", net->proc_net);
3849         free_percpu(ipvs->tot_stats.cpustats);
3850 }
3851
3852 int __init ip_vs_register_nl_ioctl(void)
3853 {
3854         int ret;
3855
3856         ret = nf_register_sockopt(&ip_vs_sockopts);
3857         if (ret) {
3858                 pr_err("cannot register sockopt.\n");
3859                 goto err_sock;
3860         }
3861
3862         ret = ip_vs_genl_register();
3863         if (ret) {
3864                 pr_err("cannot register Generic Netlink interface.\n");
3865                 goto err_genl;
3866         }
3867         return 0;
3868
3869 err_genl:
3870         nf_unregister_sockopt(&ip_vs_sockopts);
3871 err_sock:
3872         return ret;
3873 }
3874
3875 void ip_vs_unregister_nl_ioctl(void)
3876 {
3877         ip_vs_genl_unregister();
3878         nf_unregister_sockopt(&ip_vs_sockopts);
3879 }
3880
3881 int __init ip_vs_control_init(void)
3882 {
3883         int idx;
3884         int ret;
3885
3886         EnterFunction(2);
3887
3888         /* Initialize svc_table, ip_vs_svc_fwm_table */
3889         for (idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
3890                 INIT_HLIST_HEAD(&ip_vs_svc_table[idx]);
3891                 INIT_HLIST_HEAD(&ip_vs_svc_fwm_table[idx]);
3892         }
3893
3894         smp_wmb();      /* Do we really need it now ? */
3895
3896         ret = register_netdevice_notifier(&ip_vs_dst_notifier);
3897         if (ret < 0)
3898                 return ret;
3899
3900         LeaveFunction(2);
3901         return 0;
3902 }
3903
3904
3905 void ip_vs_control_cleanup(void)
3906 {
3907         EnterFunction(2);
3908         unregister_netdevice_notifier(&ip_vs_dst_notifier);
3909         LeaveFunction(2);
3910 }