net/netfilter/ipvs/ip_vs_ctl.c

   1 /*
   2  * IPVS         An implementation of the IP virtual server support for the
   3  *              LINUX operating system.  IPVS is now implemented as a module
   4  *              over the NetFilter framework. IPVS can be used to build a
   5  *              high-performance and highly available server based on a
   6  *              cluster of servers.
   7  *
   8  * Authors:     Wensong Zhang <wensong@linuxvirtualserver.org>
   9  *              Peter Kese <peter.kese@ijs.si>
  10  *              Julian Anastasov <ja@ssi.bg>
  11  *
  12  *              This program is free software; you can redistribute it and/or
  13  *              modify it under the terms of the GNU General Public License
  14  *              as published by the Free Software Foundation; either version
  15  *              2 of the License, or (at your option) any later version.
  16  *
  17  * Changes:
  18  *
  19  */
  20
  21 #define KMSG_COMPONENT "IPVS"
  22 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  23
  24 #include <linux/module.h>
  25 #include <linux/init.h>
  26 #include <linux/types.h>
  27 #include <linux/capability.h>
  28 #include <linux/fs.h>
  29 #include <linux/sysctl.h>
  30 #include <linux/proc_fs.h>
  31 #include <linux/workqueue.h>
  32 #include <linux/swap.h>
  33 #include <linux/seq_file.h>
  34 #include <linux/slab.h>
  35
  36 #include <linux/netfilter.h>
  37 #include <linux/netfilter_ipv4.h>
  38 #include <linux/mutex.h>
  39
  40 #include <net/net_namespace.h>
  41 #include <linux/nsproxy.h>
  42 #include <net/ip.h>
  43 #ifdef CONFIG_IP_VS_IPV6
  44 #include <net/ipv6.h>
  45 #include <net/ip6_route.h>
  46 #endif
  47 #include <net/route.h>
  48 #include <net/sock.h>
  49 #include <net/genetlink.h>
  50
  51 #include <asm/uaccess.h>
  52
  53 #include <net/ip_vs.h>
  54
  55 /* semaphore for IPVS sockopts. And, [gs]etsockopt may sleep. */
  56 static DEFINE_MUTEX(__ip_vs_mutex);
  57
  58 /* sysctl variables */
  59
  60 #ifdef CONFIG_IP_VS_DEBUG
  61 static int sysctl_ip_vs_debug_level = 0;
  62
  63 int ip_vs_get_debug_level(void)
  64 {
  65         return sysctl_ip_vs_debug_level;
  66 }
  67 #endif
  68
  69
  70 /*  Protos */
  71 static void __ip_vs_del_service(struct ip_vs_service *svc, bool cleanup);
  72
  73
  74 #ifdef CONFIG_IP_VS_IPV6
  75 /* Taken from rt6_fill_node() in net/ipv6/route.c, is there a better way? */
  76 static bool __ip_vs_addr_is_local_v6(struct net *net,
  77                                      const struct in6_addr *addr)
  78 {
  79         struct flowi6 fl6 = {
  80                 .daddr = *addr,
  81         };
  82         struct dst_entry *dst = ip6_route_output(net, NULL, &fl6);
  83         bool is_local;
  84
  85         is_local = !dst->error && dst->dev && (dst->dev->flags & IFF_LOOPBACK);
  86
  87         dst_release(dst);
  88         return is_local;
  89 }
  90 #endif
  91
  92 #ifdef CONFIG_SYSCTL
  93 /*
  94  *      update_defense_level is called from keventd and from sysctl,
  95  *      so it needs to protect itself from softirqs
  96  */
  97 static void update_defense_level(struct netns_ipvs *ipvs)
  98 {
  99         struct sysinfo i;
 100         static int old_secure_tcp = 0;
 101         int availmem;
 102         int nomem;
 103         int to_change = -1;
 104
 105         /* we only count free and buffered memory (in pages) */
 106         si_meminfo(&i);
 107         availmem = i.freeram + i.bufferram;
 108         /* however in linux 2.5 the i.bufferram is total page cache size,
 109            we need adjust it */
 110         /* si_swapinfo(&i); */
 111         /* availmem = availmem - (i.totalswap - i.freeswap); */
 112
 113         nomem = (availmem < ipvs->sysctl_amemthresh);
 114
 115         local_bh_disable();
 116
 117         /* drop_entry */
 118         spin_lock(&ipvs->dropentry_lock);
 119         switch (ipvs->sysctl_drop_entry) {
 120         case 0:
 121                 atomic_set(&ipvs->dropentry, 0);
 122                 break;
 123         case 1:
 124                 if (nomem) {
 125                         atomic_set(&ipvs->dropentry, 1);
 126                         ipvs->sysctl_drop_entry = 2;
 127                 } else {
 128                         atomic_set(&ipvs->dropentry, 0);
 129                 }
 130                 break;
 131         case 2:
 132                 if (nomem) {
 133                         atomic_set(&ipvs->dropentry, 1);
 134                 } else {
 135                         atomic_set(&ipvs->dropentry, 0);
 136                         ipvs->sysctl_drop_entry = 1;
 137                 };
 138                 break;
 139         case 3:
 140                 atomic_set(&ipvs->dropentry, 1);
 141                 break;
 142         }
 143         spin_unlock(&ipvs->dropentry_lock);
 144
 145         /* drop_packet */
 146         spin_lock(&ipvs->droppacket_lock);
 147         switch (ipvs->sysctl_drop_packet) {
 148         case 0:
 149                 ipvs->drop_rate = 0;
 150                 break;
 151         case 1:
 152                 if (nomem) {
 153                         ipvs->drop_rate = ipvs->drop_counter
 154                                 = ipvs->sysctl_amemthresh /
 155                                 (ipvs->sysctl_amemthresh-availmem);
 156                         ipvs->sysctl_drop_packet = 2;
 157                 } else {
 158                         ipvs->drop_rate = 0;
 159                 }
 160                 break;
 161         case 2:
 162                 if (nomem) {
 163                         ipvs->drop_rate = ipvs->drop_counter
 164                                 = ipvs->sysctl_amemthresh /
 165                                 (ipvs->sysctl_amemthresh-availmem);
 166                 } else {
 167                         ipvs->drop_rate = 0;
 168                         ipvs->sysctl_drop_packet = 1;
 169                 }
 170                 break;
 171         case 3:
 172                 ipvs->drop_rate = ipvs->sysctl_am_droprate;
 173                 break;
 174         }
 175         spin_unlock(&ipvs->droppacket_lock);
 176
 177         /* secure_tcp */
 178         spin_lock(&ipvs->securetcp_lock);
 179         switch (ipvs->sysctl_secure_tcp) {
 180         case 0:
 181                 if (old_secure_tcp >= 2)
 182                         to_change = 0;
 183                 break;
 184         case 1:
 185                 if (nomem) {
 186                         if (old_secure_tcp < 2)
 187                                 to_change = 1;
 188                         ipvs->sysctl_secure_tcp = 2;
 189                 } else {
 190                         if (old_secure_tcp >= 2)
 191                                 to_change = 0;
 192                 }
 193                 break;
 194         case 2:
 195                 if (nomem) {
 196                         if (old_secure_tcp < 2)
 197                                 to_change = 1;
 198                 } else {
 199                         if (old_secure_tcp >= 2)
 200                                 to_change = 0;
 201                         ipvs->sysctl_secure_tcp = 1;
 202                 }
 203                 break;
 204         case 3:
 205                 if (old_secure_tcp < 2)
 206                         to_change = 1;
 207                 break;
 208         }
 209         old_secure_tcp = ipvs->sysctl_secure_tcp;
 210         if (to_change >= 0)
 211                 ip_vs_protocol_timeout_change(ipvs,
 212                                               ipvs->sysctl_secure_tcp > 1);
 213         spin_unlock(&ipvs->securetcp_lock);
 214
 215         local_bh_enable();
 216 }
 217
 218
 219 /*
 220  *      Timer for checking the defense
 221  */
 222 #define DEFENSE_TIMER_PERIOD    1*HZ
 223
 224 static void defense_work_handler(struct work_struct *work)
 225 {
 226         struct netns_ipvs *ipvs =
 227                 container_of(work, struct netns_ipvs, defense_work.work);
 228
 229         update_defense_level(ipvs);
 230         if (atomic_read(&ipvs->dropentry))
 231                 ip_vs_random_dropentry(ipvs->net);
 232         schedule_delayed_work(&ipvs->defense_work, DEFENSE_TIMER_PERIOD);
 233 }
 234 #endif
 235
 236 int
 237 ip_vs_use_count_inc(void)
 238 {
 239         return try_module_get(THIS_MODULE);
 240 }
 241
 242 void
 243 ip_vs_use_count_dec(void)
 244 {
 245         module_put(THIS_MODULE);
 246 }
 247
 248
 249 /*
 250  *      Hash table: for virtual service lookups
 251  */
 252 #define IP_VS_SVC_TAB_BITS 8
 253 #define IP_VS_SVC_TAB_SIZE (1 << IP_VS_SVC_TAB_BITS)
 254 #define IP_VS_SVC_TAB_MASK (IP_VS_SVC_TAB_SIZE - 1)
 255
 256 /* the service table hashed by <protocol, addr, port> */
 257 static struct hlist_head ip_vs_svc_table[IP_VS_SVC_TAB_SIZE];
 258 /* the service table hashed by fwmark */
 259 static struct hlist_head ip_vs_svc_fwm_table[IP_VS_SVC_TAB_SIZE];
 260
 261
 262 /*
 263  *      Returns hash value for virtual service
 264  */
 265 static inline unsigned int
 266 ip_vs_svc_hashkey(struct net *net, int af, unsigned int proto,
 267                   const union nf_inet_addr *addr, __be16 port)
 268 {
 269         register unsigned int porth = ntohs(port);
 270         __be32 addr_fold = addr->ip;
 271         __u32 ahash;
 272
 273 #ifdef CONFIG_IP_VS_IPV6
 274         if (af == AF_INET6)
 275                 addr_fold = addr->ip6[0]^addr->ip6[1]^
 276                             addr->ip6[2]^addr->ip6[3];
 277 #endif
 278         ahash = ntohl(addr_fold);
 279         ahash ^= ((size_t) net >> 8);
 280
 281         return (proto ^ ahash ^ (porth >> IP_VS_SVC_TAB_BITS) ^ porth) &
 282                IP_VS_SVC_TAB_MASK;
 283 }
 284
 285 /*
 286  *      Returns hash value of fwmark for virtual service lookup
 287  */
 288 static inline unsigned int ip_vs_svc_fwm_hashkey(struct net *net, __u32 fwmark)
 289 {
 290         return (((size_t)net>>8) ^ fwmark) & IP_VS_SVC_TAB_MASK;
 291 }
 292
 293 /*
 294  *      Hashes a service in the ip_vs_svc_table by <netns,proto,addr,port>
 295  *      or in the ip_vs_svc_fwm_table by fwmark.
 296  *      Should be called with locked tables.
 297  */
 298 static int ip_vs_svc_hash(struct ip_vs_service *svc)
 299 {
 300         unsigned int hash;
 301
 302         if (svc->flags & IP_VS_SVC_F_HASHED) {
 303                 pr_err("%s(): request for already hashed, called from %pF\n",
 304                        __func__, __builtin_return_address(0));
 305                 return 0;
 306         }
 307
 308         if (svc->fwmark == 0) {
 309                 /*
 310                  *  Hash it by <netns,protocol,addr,port> in ip_vs_svc_table
 311                  */
 312                 hash = ip_vs_svc_hashkey(svc->net, svc->af, svc->protocol,
 313                                          &svc->addr, svc->port);
 314                 hlist_add_head_rcu(&svc->s_list, &ip_vs_svc_table[hash]);
 315         } else {
 316                 /*
 317                  *  Hash it by fwmark in svc_fwm_table
 318                  */
 319                 hash = ip_vs_svc_fwm_hashkey(svc->net, svc->fwmark);
 320                 hlist_add_head_rcu(&svc->f_list, &ip_vs_svc_fwm_table[hash]);
 321         }
 322
 323         svc->flags |= IP_VS_SVC_F_HASHED;
 324         /* increase its refcnt because it is referenced by the svc table */
 325         atomic_inc(&svc->refcnt);
 326         return 1;
 327 }
 328
 329
 330 /*
 331  *      Unhashes a service from svc_table / svc_fwm_table.
 332  *      Should be called with locked tables.
 333  */
 334 static int ip_vs_svc_unhash(struct ip_vs_service *svc)
 335 {
 336         if (!(svc->flags & IP_VS_SVC_F_HASHED)) {
 337                 pr_err("%s(): request for unhash flagged, called from %pF\n",
 338                        __func__, __builtin_return_address(0));
 339                 return 0;
 340         }
 341
 342         if (svc->fwmark == 0) {
 343                 /* Remove it from the svc_table table */
 344                 hlist_del_rcu(&svc->s_list);
 345         } else {
 346                 /* Remove it from the svc_fwm_table table */
 347                 hlist_del_rcu(&svc->f_list);
 348         }
 349
 350         svc->flags &= ~IP_VS_SVC_F_HASHED;
 351         atomic_dec(&svc->refcnt);
 352         return 1;
 353 }
 354
 355
 356 /*
 357  *      Get service by {netns, proto,addr,port} in the service table.
 358  */
 359 static inline struct ip_vs_service *
 360 __ip_vs_service_find(struct net *net, int af, __u16 protocol,
 361                      const union nf_inet_addr *vaddr, __be16 vport)
 362 {
 363         unsigned int hash;
 364         struct ip_vs_service *svc;
 365
 366         /* Check for "full" addressed entries */
 367         hash = ip_vs_svc_hashkey(net, af, protocol, vaddr, vport);
 368
 369         hlist_for_each_entry_rcu(svc, &ip_vs_svc_table[hash], s_list) {
 370                 if ((svc->af == af)
 371                     && ip_vs_addr_equal(af, &svc->addr, vaddr)
 372                     && (svc->port == vport)
 373                     && (svc->protocol == protocol)
 374                     && net_eq(svc->net, net)) {
 375                         /* HIT */
 376                         return svc;
 377                 }
 378         }
 379
 380         return NULL;
 381 }
 382
 383
 384 /*
 385  *      Get service by {fwmark} in the service table.
 386  */
 387 static inline struct ip_vs_service *
 388 __ip_vs_svc_fwm_find(struct net *net, int af, __u32 fwmark)
 389 {
 390         unsigned int hash;
 391         struct ip_vs_service *svc;
 392
 393         /* Check for fwmark addressed entries */
 394         hash = ip_vs_svc_fwm_hashkey(net, fwmark);
 395
 396         hlist_for_each_entry_rcu(svc, &ip_vs_svc_fwm_table[hash], f_list) {
 397                 if (svc->fwmark == fwmark && svc->af == af
 398                     && net_eq(svc->net, net)) {
 399                         /* HIT */
 400                         return svc;
 401                 }
 402         }
 403
 404         return NULL;
 405 }
 406
 407 /* Find service, called under RCU lock */
 408 struct ip_vs_service *
 409 ip_vs_service_find(struct net *net, int af, __u32 fwmark, __u16 protocol,
 410                    const union nf_inet_addr *vaddr, __be16 vport)
 411 {
 412         struct ip_vs_service *svc;
 413         struct netns_ipvs *ipvs = net_ipvs(net);
 414
 415         /*
 416          *      Check the table hashed by fwmark first
 417          */
 418         if (fwmark) {
 419                 svc = __ip_vs_svc_fwm_find(net, af, fwmark);
 420                 if (svc)
 421                         goto out;
 422         }
 423
 424         /*
 425          *      Check the table hashed by <protocol,addr,port>
 426          *      for "full" addressed entries
 427          */
 428         svc = __ip_vs_service_find(net, af, protocol, vaddr, vport);
 429
 430         if (svc == NULL
 431             && protocol == IPPROTO_TCP
 432             && atomic_read(&ipvs->ftpsvc_counter)
 433             && (vport == FTPDATA || ntohs(vport) >= PROT_SOCK)) {
 434                 /*
 435                  * Check if ftp service entry exists, the packet
 436                  * might belong to FTP data connections.
 437                  */
 438                 svc = __ip_vs_service_find(net, af, protocol, vaddr, FTPPORT);
 439         }
 440
 441         if (svc == NULL
 442             && atomic_read(&ipvs->nullsvc_counter)) {
 443                 /*
 444                  * Check if the catch-all port (port zero) exists
 445                  */
 446                 svc = __ip_vs_service_find(net, af, protocol, vaddr, 0);
 447         }
 448
 449   out:
 450         IP_VS_DBG_BUF(9, "lookup service: fwm %u %s %s:%u %s\n",
 451                       fwmark, ip_vs_proto_name(protocol),
 452                       IP_VS_DBG_ADDR(af, vaddr), ntohs(vport),
 453                       svc ? "hit" : "not hit");
 454
 455         return svc;
 456 }
 457
 458
 459 static inline void
 460 __ip_vs_bind_svc(struct ip_vs_dest *dest, struct ip_vs_service *svc)
 461 {
 462         atomic_inc(&svc->refcnt);
 463         rcu_assign_pointer(dest->svc, svc);
 464 }
 465
 466 static void ip_vs_service_free(struct ip_vs_service *svc)
 467 {
 468         free_percpu(svc->stats.cpustats);
 469         kfree(svc);
 470 }
 471
 472 static void ip_vs_service_rcu_free(struct rcu_head *head)
 473 {
 474         struct ip_vs_service *svc;
 475
 476         svc = container_of(head, struct ip_vs_service, rcu_head);
 477         ip_vs_service_free(svc);
 478 }
 479
 480 static void __ip_vs_svc_put(struct ip_vs_service *svc, bool do_delay)
 481 {
 482         if (atomic_dec_and_test(&svc->refcnt)) {
 483                 IP_VS_DBG_BUF(3, "Removing service %u/%s:%u\n",
 484                               svc->fwmark,
 485                               IP_VS_DBG_ADDR(svc->af, &svc->addr),
 486                               ntohs(svc->port));
 487                 if (do_delay)
 488                         call_rcu(&svc->rcu_head, ip_vs_service_rcu_free);
 489                 else
 490                         ip_vs_service_free(svc);
 491         }
 492 }
 493
 494
 495 /*
 496  *      Returns hash value for real service
 497  */
 498 static inline unsigned int ip_vs_rs_hashkey(int af,
 499                                             const union nf_inet_addr *addr,
 500                                             __be16 port)
 501 {
 502         register unsigned int porth = ntohs(port);
 503         __be32 addr_fold = addr->ip;
 504
 505 #ifdef CONFIG_IP_VS_IPV6
 506         if (af == AF_INET6)
 507                 addr_fold = addr->ip6[0]^addr->ip6[1]^
 508                             addr->ip6[2]^addr->ip6[3];
 509 #endif
 510
 511         return (ntohl(addr_fold)^(porth>>IP_VS_RTAB_BITS)^porth)
 512                 & IP_VS_RTAB_MASK;
 513 }
 514
 515 /* Hash ip_vs_dest in rs_table by <proto,addr,port>. */
 516 static void ip_vs_rs_hash(struct netns_ipvs *ipvs, struct ip_vs_dest *dest)
 517 {
 518         unsigned int hash;
 519
 520         if (dest->in_rs_table)
 521                 return;
 522
 523         /*
 524          *      Hash by proto,addr,port,
 525          *      which are the parameters of the real service.
 526          */
 527         hash = ip_vs_rs_hashkey(dest->af, &dest->addr, dest->port);
 528
 529         hlist_add_head_rcu(&dest->d_list, &ipvs->rs_table[hash]);
 530         dest->in_rs_table = 1;
 531 }
 532
 533 /* Unhash ip_vs_dest from rs_table. */
 534 static void ip_vs_rs_unhash(struct ip_vs_dest *dest)
 535 {
 536         /*
 537          * Remove it from the rs_table table.
 538          */
 539         if (dest->in_rs_table) {
 540                 hlist_del_rcu(&dest->d_list);
 541                 dest->in_rs_table = 0;
 542         }
 543 }
 544
 545 /* Check if real service by <proto,addr,port> is present */
 546 bool ip_vs_has_real_service(struct net *net, int af, __u16 protocol,
 547                             const union nf_inet_addr *daddr, __be16 dport)
 548 {
 549         struct netns_ipvs *ipvs = net_ipvs(net);
 550         unsigned int hash;
 551         struct ip_vs_dest *dest;
 552
 553         /* Check for "full" addressed entries */
 554         hash = ip_vs_rs_hashkey(af, daddr, dport);
 555
 556         rcu_read_lock();
 557         hlist_for_each_entry_rcu(dest, &ipvs->rs_table[hash], d_list) {
 558                 if (dest->port == dport &&
 559                     dest->af == af &&
 560                     ip_vs_addr_equal(af, &dest->addr, daddr) &&
 561                     (dest->protocol == protocol || dest->vfwmark)) {
 562                         /* HIT */
 563                         rcu_read_unlock();
 564                         return true;
 565                 }
 566         }
 567         rcu_read_unlock();
 568
 569         return false;
 570 }
 571
 572 /* Lookup destination by {addr,port} in the given service
 573  * Called under RCU lock.
 574  */
 575 static struct ip_vs_dest *
 576 ip_vs_lookup_dest(struct ip_vs_service *svc, int dest_af,
 577                   const union nf_inet_addr *daddr, __be16 dport)
 578 {
 579         struct ip_vs_dest *dest;
 580
 581         /*
 582          * Find the destination for the given service
 583          */
 584         list_for_each_entry_rcu(dest, &svc->destinations, n_list) {
 585                 if ((dest->af == dest_af) &&
 586                     ip_vs_addr_equal(dest_af, &dest->addr, daddr) &&
 587                     (dest->port == dport)) {
 588                         /* HIT */
 589                         return dest;
 590                 }
 591         }
 592
 593         return NULL;
 594 }
 595
 596 /*
 597  * Find destination by {daddr,dport,vaddr,protocol}
 598  * Created to be used in ip_vs_process_message() in
 599  * the backup synchronization daemon. It finds the
 600  * destination to be bound to the received connection
 601  * on the backup.
 602  * Called under RCU lock, no refcnt is returned.
 603  */
 604 struct ip_vs_dest *ip_vs_find_dest(struct net  *net, int svc_af, int dest_af,
 605                                    const union nf_inet_addr *daddr,
 606                                    __be16 dport,
 607                                    const union nf_inet_addr *vaddr,
 608                                    __be16 vport, __u16 protocol, __u32 fwmark,
 609                                    __u32 flags)
 610 {
 611         struct ip_vs_dest *dest;
 612         struct ip_vs_service *svc;
 613         __be16 port = dport;
 614
 615         svc = ip_vs_service_find(net, svc_af, fwmark, protocol, vaddr, vport);
 616         if (!svc)
 617                 return NULL;
 618         if (fwmark && (flags & IP_VS_CONN_F_FWD_MASK) != IP_VS_CONN_F_MASQ)
 619                 port = 0;
 620         dest = ip_vs_lookup_dest(svc, dest_af, daddr, port);
 621         if (!dest)
 622                 dest = ip_vs_lookup_dest(svc, dest_af, daddr, port ^ dport);
 623         return dest;
 624 }
 625
 626 void ip_vs_dest_dst_rcu_free(struct rcu_head *head)
 627 {
 628         struct ip_vs_dest_dst *dest_dst = container_of(head,
 629                                                        struct ip_vs_dest_dst,
 630                                                        rcu_head);
 631
 632         dst_release(dest_dst->dst_cache);
 633         kfree(dest_dst);
 634 }
 635
 636 /* Release dest_dst and dst_cache for dest in user context */
 637 static void __ip_vs_dst_cache_reset(struct ip_vs_dest *dest)
 638 {
 639         struct ip_vs_dest_dst *old;
 640
 641         old = rcu_dereference_protected(dest->dest_dst, 1);
 642         if (old) {
 643                 RCU_INIT_POINTER(dest->dest_dst, NULL);
 644                 call_rcu(&old->rcu_head, ip_vs_dest_dst_rcu_free);
 645         }
 646 }
 647
 648 /*
 649  *  Lookup dest by {svc,addr,port} in the destination trash.
 650  *  The destination trash is used to hold the destinations that are removed
 651  *  from the service table but are still referenced by some conn entries.
 652  *  The reason to add the destination trash is when the dest is temporary
 653  *  down (either by administrator or by monitor program), the dest can be
 654  *  picked back from the trash, the remaining connections to the dest can
 655  *  continue, and the counting information of the dest is also useful for
 656  *  scheduling.
 657  */
 658 static struct ip_vs_dest *
 659 ip_vs_trash_get_dest(struct ip_vs_service *svc, int dest_af,
 660                      const union nf_inet_addr *daddr, __be16 dport)
 661 {
 662         struct ip_vs_dest *dest;
 663         struct netns_ipvs *ipvs = net_ipvs(svc->net);
 664
 665         /*
 666          * Find the destination in trash
 667          */
 668         spin_lock_bh(&ipvs->dest_trash_lock);
 669         list_for_each_entry(dest, &ipvs->dest_trash, t_list) {
 670                 IP_VS_DBG_BUF(3, "Destination %u/%s:%u still in trash, "
 671                               "dest->refcnt=%d\n",
 672                               dest->vfwmark,
 673                               IP_VS_DBG_ADDR(dest->af, &dest->addr),
 674                               ntohs(dest->port),
 675                               atomic_read(&dest->refcnt));
 676                 if (dest->af == dest_af &&
 677                     ip_vs_addr_equal(dest_af, &dest->addr, daddr) &&
 678                     dest->port == dport &&
 679                     dest->vfwmark == svc->fwmark &&
 680                     dest->protocol == svc->protocol &&
 681                     (svc->fwmark ||
 682                      (ip_vs_addr_equal(svc->af, &dest->vaddr, &svc->addr) &&
 683                       dest->vport == svc->port))) {
 684                         /* HIT */
 685                         list_del(&dest->t_list);
 686                         ip_vs_dest_hold(dest);
 687                         goto out;
 688                 }
 689         }
 690
 691         dest = NULL;
 692
 693 out:
 694         spin_unlock_bh(&ipvs->dest_trash_lock);
 695
 696         return dest;
 697 }
 698
 699 static void ip_vs_dest_free(struct ip_vs_dest *dest)
 700 {
 701         struct ip_vs_service *svc = rcu_dereference_protected(dest->svc, 1);
 702
 703         __ip_vs_dst_cache_reset(dest);
 704         __ip_vs_svc_put(svc, false);
 705         free_percpu(dest->stats.cpustats);
 706         ip_vs_dest_put_and_free(dest);
 707 }
 708
 709 /*
 710  *  Clean up all the destinations in the trash
 711  *  Called by the ip_vs_control_cleanup()
 712  *
 713  *  When the ip_vs_control_clearup is activated by ipvs module exit,
 714  *  the service tables must have been flushed and all the connections
 715  *  are expired, and the refcnt of each destination in the trash must
 716  *  be 0, so we simply release them here.
 717  */
 718 static void ip_vs_trash_cleanup(struct net *net)
 719 {
 720         struct ip_vs_dest *dest, *nxt;
 721         struct netns_ipvs *ipvs = net_ipvs(net);
 722
 723         del_timer_sync(&ipvs->dest_trash_timer);
 724         /* No need to use dest_trash_lock */
 725         list_for_each_entry_safe(dest, nxt, &ipvs->dest_trash, t_list) {
 726                 list_del(&dest->t_list);
 727                 ip_vs_dest_free(dest);
 728         }
 729 }
 730
 731 static void
 732 ip_vs_copy_stats(struct ip_vs_kstats *dst, struct ip_vs_stats *src)
 733 {
 734 #define IP_VS_SHOW_STATS_COUNTER(c) dst->c = src->kstats.c - src->kstats0.c
 735
 736         spin_lock_bh(&src->lock);
 737
 738         IP_VS_SHOW_STATS_COUNTER(conns);
 739         IP_VS_SHOW_STATS_COUNTER(inpkts);
 740         IP_VS_SHOW_STATS_COUNTER(outpkts);
 741         IP_VS_SHOW_STATS_COUNTER(inbytes);
 742         IP_VS_SHOW_STATS_COUNTER(outbytes);
 743
 744         ip_vs_read_estimator(dst, src);
 745
 746         spin_unlock_bh(&src->lock);
 747 }
 748
 749 static void
 750 ip_vs_export_stats_user(struct ip_vs_stats_user *dst, struct ip_vs_kstats *src)
 751 {
 752         dst->conns = (u32)src->conns;
 753         dst->inpkts = (u32)src->inpkts;
 754         dst->outpkts = (u32)src->outpkts;
 755         dst->inbytes = src->inbytes;
 756         dst->outbytes = src->outbytes;
 757         dst->cps = (u32)src->cps;
 758         dst->inpps = (u32)src->inpps;
 759         dst->outpps = (u32)src->outpps;
 760         dst->inbps = (u32)src->inbps;
 761         dst->outbps = (u32)src->outbps;
 762 }
 763
 764 static void
 765 ip_vs_zero_stats(struct ip_vs_stats *stats)
 766 {
 767         spin_lock_bh(&stats->lock);
 768
 769         /* get current counters as zero point, rates are zeroed */
 770
 771 #define IP_VS_ZERO_STATS_COUNTER(c) stats->kstats0.c = stats->kstats.c
 772
 773         IP_VS_ZERO_STATS_COUNTER(conns);
 774         IP_VS_ZERO_STATS_COUNTER(inpkts);
 775         IP_VS_ZERO_STATS_COUNTER(outpkts);
 776         IP_VS_ZERO_STATS_COUNTER(inbytes);
 777         IP_VS_ZERO_STATS_COUNTER(outbytes);
 778
 779         ip_vs_zero_estimator(stats);
 780
 781         spin_unlock_bh(&stats->lock);
 782 }
 783
 784 /*
 785  *      Update a destination in the given service
 786  */
 787 static void
 788 __ip_vs_update_dest(struct ip_vs_service *svc, struct ip_vs_dest *dest,
 789                     struct ip_vs_dest_user_kern *udest, int add)
 790 {
 791         struct netns_ipvs *ipvs = net_ipvs(svc->net);
 792         struct ip_vs_service *old_svc;
 793         struct ip_vs_scheduler *sched;
 794         int conn_flags;
 795
 796         /* We cannot modify an address and change the address family */
 797         BUG_ON(!add && udest->af != dest->af);
 798
 799         if (add && udest->af != svc->af)
 800                 ipvs->mixed_address_family_dests++;
 801
 802         /* set the weight and the flags */
 803         atomic_set(&dest->weight, udest->weight);
 804         conn_flags = udest->conn_flags & IP_VS_CONN_F_DEST_MASK;
 805         conn_flags |= IP_VS_CONN_F_INACTIVE;
 806
 807         /* set the IP_VS_CONN_F_NOOUTPUT flag if not masquerading/NAT */
 808         if ((conn_flags & IP_VS_CONN_F_FWD_MASK) != IP_VS_CONN_F_MASQ) {
 809                 conn_flags |= IP_VS_CONN_F_NOOUTPUT;
 810         } else {
 811                 /*
 812                  *    Put the real service in rs_table if not present.
 813                  *    For now only for NAT!
 814                  */
 815                 ip_vs_rs_hash(ipvs, dest);
 816         }
 817         atomic_set(&dest->conn_flags, conn_flags);
 818
 819         /* bind the service */
 820         old_svc = rcu_dereference_protected(dest->svc, 1);
 821         if (!old_svc) {
 822                 __ip_vs_bind_svc(dest, svc);
 823         } else {
 824                 if (old_svc != svc) {
 825                         ip_vs_zero_stats(&dest->stats);
 826                         __ip_vs_bind_svc(dest, svc);
 827                         __ip_vs_svc_put(old_svc, true);
 828                 }
 829         }
 830
 831         /* set the dest status flags */
 832         dest->flags |= IP_VS_DEST_F_AVAILABLE;
 833
 834         if (udest->u_threshold == 0 || udest->u_threshold > dest->u_threshold)
 835                 dest->flags &= ~IP_VS_DEST_F_OVERLOAD;
 836         dest->u_threshold = udest->u_threshold;
 837         dest->l_threshold = udest->l_threshold;
 838
 839         dest->af = udest->af;
 840
 841         spin_lock_bh(&dest->dst_lock);
 842         __ip_vs_dst_cache_reset(dest);
 843         spin_unlock_bh(&dest->dst_lock);
 844
 845         if (add) {
 846                 ip_vs_start_estimator(svc->net, &dest->stats);
 847                 list_add_rcu(&dest->n_list, &svc->destinations);
 848                 svc->num_dests++;
 849                 sched = rcu_dereference_protected(svc->scheduler, 1);
 850                 if (sched && sched->add_dest)
 851                         sched->add_dest(svc, dest);
 852         } else {
 853                 sched = rcu_dereference_protected(svc->scheduler, 1);
 854                 if (sched && sched->upd_dest)
 855                         sched->upd_dest(svc, dest);
 856         }
 857 }
 858
 859
 860 /*
 861  *      Create a destination for the given service
 862  */
 863 static int
 864 ip_vs_new_dest(struct ip_vs_service *svc, struct ip_vs_dest_user_kern *udest,
 865                struct ip_vs_dest **dest_p)
 866 {
 867         struct ip_vs_dest *dest;
 868         unsigned int atype, i;
 869
 870         EnterFunction(2);
 871
 872 #ifdef CONFIG_IP_VS_IPV6
 873         if (udest->af == AF_INET6) {
 874                 atype = ipv6_addr_type(&udest->addr.in6);
 875                 if ((!(atype & IPV6_ADDR_UNICAST) ||
 876                         atype & IPV6_ADDR_LINKLOCAL) &&
 877                         !__ip_vs_addr_is_local_v6(svc->net, &udest->addr.in6))
 878                         return -EINVAL;
 879         } else
 880 #endif
 881         {
 882                 atype = inet_addr_type(svc->net, udest->addr.ip);
 883                 if (atype != RTN_LOCAL && atype != RTN_UNICAST)
 884                         return -EINVAL;
 885         }
 886
 887         dest = kzalloc(sizeof(struct ip_vs_dest), GFP_KERNEL);
 888         if (dest == NULL)
 889                 return -ENOMEM;
 890
 891         dest->stats.cpustats = alloc_percpu(struct ip_vs_cpu_stats);
 892         if (!dest->stats.cpustats)
 893                 goto err_alloc;
 894
 895         for_each_possible_cpu(i) {
 896                 struct ip_vs_cpu_stats *ip_vs_dest_stats;
 897                 ip_vs_dest_stats = per_cpu_ptr(dest->stats.cpustats, i);
 898                 u64_stats_init(&ip_vs_dest_stats->syncp);
 899         }
 900
 901         dest->af = udest->af;
 902         dest->protocol = svc->protocol;
 903         dest->vaddr = svc->addr;
 904         dest->vport = svc->port;
 905         dest->vfwmark = svc->fwmark;
 906         ip_vs_addr_copy(udest->af, &dest->addr, &udest->addr);
 907         dest->port = udest->port;
 908
 909         atomic_set(&dest->activeconns, 0);
 910         atomic_set(&dest->inactconns, 0);
 911         atomic_set(&dest->persistconns, 0);
 912         atomic_set(&dest->refcnt, 1);
 913
 914         INIT_HLIST_NODE(&dest->d_list);
 915         spin_lock_init(&dest->dst_lock);
 916         spin_lock_init(&dest->stats.lock);
 917         __ip_vs_update_dest(svc, dest, udest, 1);
 918
 919         *dest_p = dest;
 920
 921         LeaveFunction(2);
 922         return 0;
 923
 924 err_alloc:
 925         kfree(dest);
 926         return -ENOMEM;
 927 }
 928
 929
 930 /*
 931  *      Add a destination into an existing service
 932  */
 933 static int
 934 ip_vs_add_dest(struct ip_vs_service *svc, struct ip_vs_dest_user_kern *udest)
 935 {
 936         struct ip_vs_dest *dest;
 937         union nf_inet_addr daddr;
 938         __be16 dport = udest->port;
 939         int ret;
 940
 941         EnterFunction(2);
 942
 943         if (udest->weight < 0) {
 944                 pr_err("%s(): server weight less than zero\n", __func__);
 945                 return -ERANGE;
 946         }
 947
 948         if (udest->l_threshold > udest->u_threshold) {
 949                 pr_err("%s(): lower threshold is higher than upper threshold\n",
 950                         __func__);
 951                 return -ERANGE;
 952         }
 953
 954         ip_vs_addr_copy(udest->af, &daddr, &udest->addr);
 955
 956         /* We use function that requires RCU lock */
 957         rcu_read_lock();
 958         dest = ip_vs_lookup_dest(svc, udest->af, &daddr, dport);
 959         rcu_read_unlock();
 960
 961         if (dest != NULL) {
 962                 IP_VS_DBG(1, "%s(): dest already exists\n", __func__);
 963                 return -EEXIST;
 964         }
 965
 966         /*
 967          * Check if the dest already exists in the trash and
 968          * is from the same service
 969          */
 970         dest = ip_vs_trash_get_dest(svc, udest->af, &daddr, dport);
 971
 972         if (dest != NULL) {
 973                 IP_VS_DBG_BUF(3, "Get destination %s:%u from trash, "
 974                               "dest->refcnt=%d, service %u/%s:%u\n",
 975                               IP_VS_DBG_ADDR(udest->af, &daddr), ntohs(dport),
 976                               atomic_read(&dest->refcnt),
 977                               dest->vfwmark,
 978                               IP_VS_DBG_ADDR(svc->af, &dest->vaddr),
 979                               ntohs(dest->vport));
 980
 981                 __ip_vs_update_dest(svc, dest, udest, 1);
 982                 ret = 0;
 983         } else {
 984                 /*
 985                  * Allocate and initialize the dest structure
 986                  */
 987                 ret = ip_vs_new_dest(svc, udest, &dest);
 988         }
 989         LeaveFunction(2);
 990
 991         return ret;
 992 }
 993
 994
 995 /*
 996  *      Edit a destination in the given service
 997  */
 998 static int
 999 ip_vs_edit_dest(struct ip_vs_service *svc, struct ip_vs_dest_user_kern *udest)
1000 {
1001         struct ip_vs_dest *dest;
1002         union nf_inet_addr daddr;
1003         __be16 dport = udest->port;
1004
1005         EnterFunction(2);
1006
1007         if (udest->weight < 0) {
1008                 pr_err("%s(): server weight less than zero\n", __func__);
1009                 return -ERANGE;
1010         }
1011
1012         if (udest->l_threshold > udest->u_threshold) {
1013                 pr_err("%s(): lower threshold is higher than upper threshold\n",
1014                         __func__);
1015                 return -ERANGE;
1016         }
1017
1018         ip_vs_addr_copy(udest->af, &daddr, &udest->addr);
1019
1020         /* We use function that requires RCU lock */
1021         rcu_read_lock();
1022         dest = ip_vs_lookup_dest(svc, udest->af, &daddr, dport);
1023         rcu_read_unlock();
1024
1025         if (dest == NULL) {
1026                 IP_VS_DBG(1, "%s(): dest doesn't exist\n", __func__);
1027                 return -ENOENT;
1028         }
1029
1030         __ip_vs_update_dest(svc, dest, udest, 0);
1031         LeaveFunction(2);
1032
1033         return 0;
1034 }
1035
1036 /*
1037  *      Delete a destination (must be already unlinked from the service)
1038  */
1039 static void __ip_vs_del_dest(struct net *net, struct ip_vs_dest *dest,
1040                              bool cleanup)
1041 {
1042         struct netns_ipvs *ipvs = net_ipvs(net);
1043
1044         ip_vs_stop_estimator(net, &dest->stats);
1045
1046         /*
1047          *  Remove it from the d-linked list with the real services.
1048          */
1049         ip_vs_rs_unhash(dest);
1050
1051         spin_lock_bh(&ipvs->dest_trash_lock);
1052         IP_VS_DBG_BUF(3, "Moving dest %s:%u into trash, dest->refcnt=%d\n",
1053                       IP_VS_DBG_ADDR(dest->af, &dest->addr), ntohs(dest->port),
1054                       atomic_read(&dest->refcnt));
1055         if (list_empty(&ipvs->dest_trash) && !cleanup)
1056                 mod_timer(&ipvs->dest_trash_timer,
1057                           jiffies + (IP_VS_DEST_TRASH_PERIOD >> 1));
1058         /* dest lives in trash without reference */
1059         list_add(&dest->t_list, &ipvs->dest_trash);
1060         dest->idle_start = 0;
1061         spin_unlock_bh(&ipvs->dest_trash_lock);
1062         ip_vs_dest_put(dest);
1063 }
1064
1065
1066 /*
1067  *      Unlink a destination from the given service
1068  */
1069 static void __ip_vs_unlink_dest(struct ip_vs_service *svc,
1070                                 struct ip_vs_dest *dest,
1071                                 int svcupd)
1072 {
1073         dest->flags &= ~IP_VS_DEST_F_AVAILABLE;
1074
1075         /*
1076          *  Remove it from the d-linked destination list.
1077          */
1078         list_del_rcu(&dest->n_list);
1079         svc->num_dests--;
1080
1081         if (dest->af != svc->af)
1082                 net_ipvs(svc->net)->mixed_address_family_dests--;
1083
1084         if (svcupd) {
1085                 struct ip_vs_scheduler *sched;
1086
1087                 sched = rcu_dereference_protected(svc->scheduler, 1);
1088                 if (sched && sched->del_dest)
1089                         sched->del_dest(svc, dest);
1090         }
1091 }
1092
1093
1094 /*
1095  *      Delete a destination server in the given service
1096  */
1097 static int
1098 ip_vs_del_dest(struct ip_vs_service *svc, struct ip_vs_dest_user_kern *udest)
1099 {
1100         struct ip_vs_dest *dest;
1101         __be16 dport = udest->port;
1102
1103         EnterFunction(2);
1104
1105         /* We use function that requires RCU lock */
1106         rcu_read_lock();
1107         dest = ip_vs_lookup_dest(svc, udest->af, &udest->addr, dport);
1108         rcu_read_unlock();
1109
1110         if (dest == NULL) {
1111                 IP_VS_DBG(1, "%s(): destination not found!\n", __func__);
1112                 return -ENOENT;
1113         }
1114
1115         /*
1116          *      Unlink dest from the service
1117          */
1118         __ip_vs_unlink_dest(svc, dest, 1);
1119
1120         /*
1121          *      Delete the destination
1122          */
1123         __ip_vs_del_dest(svc->net, dest, false);
1124
1125         LeaveFunction(2);
1126
1127         return 0;
1128 }
1129
1130 static void ip_vs_dest_trash_expire(unsigned long data)
1131 {
1132         struct net *net = (struct net *) data;
1133         struct netns_ipvs *ipvs = net_ipvs(net);
1134         struct ip_vs_dest *dest, *next;
1135         unsigned long now = jiffies;
1136
1137         spin_lock(&ipvs->dest_trash_lock);
1138         list_for_each_entry_safe(dest, next, &ipvs->dest_trash, t_list) {
1139                 if (atomic_read(&dest->refcnt) > 0)
1140                         continue;
1141                 if (dest->idle_start) {
1142                         if (time_before(now, dest->idle_start +
1143                                              IP_VS_DEST_TRASH_PERIOD))
1144                                 continue;
1145                 } else {
1146                         dest->idle_start = max(1UL, now);
1147                         continue;
1148                 }
1149                 IP_VS_DBG_BUF(3, "Removing destination %u/%s:%u from trash\n",
1150                               dest->vfwmark,
1151                               IP_VS_DBG_ADDR(dest->af, &dest->addr),
1152                               ntohs(dest->port));
1153                 list_del(&dest->t_list);
1154                 ip_vs_dest_free(dest);
1155         }
1156         if (!list_empty(&ipvs->dest_trash))
1157                 mod_timer(&ipvs->dest_trash_timer,
1158                           jiffies + (IP_VS_DEST_TRASH_PERIOD >> 1));
1159         spin_unlock(&ipvs->dest_trash_lock);
1160 }
1161
1162 /*
1163  *      Add a service into the service hash table
1164  */
1165 static int
1166 ip_vs_add_service(struct net *net, struct ip_vs_service_user_kern *u,
1167                   struct ip_vs_service **svc_p)
1168 {
1169         int ret = 0, i;
1170         struct ip_vs_scheduler *sched = NULL;
1171         struct ip_vs_pe *pe = NULL;
1172         struct ip_vs_service *svc = NULL;
1173         struct netns_ipvs *ipvs = net_ipvs(net);
1174
1175         /* increase the module use count */
1176         ip_vs_use_count_inc();
1177
1178         /* Lookup the scheduler by 'u->sched_name' */
1179         if (strcmp(u->sched_name, "none")) {
1180                 sched = ip_vs_scheduler_get(u->sched_name);
1181                 if (!sched) {
1182                         pr_info("Scheduler module ip_vs_%s not found\n",
1183                                 u->sched_name);
1184                         ret = -ENOENT;
1185                         goto out_err;
1186                 }
1187         }
1188
1189         if (u->pe_name && *u->pe_name) {
1190                 pe = ip_vs_pe_getbyname(u->pe_name);
1191                 if (pe == NULL) {
1192                         pr_info("persistence engine module ip_vs_pe_%s "
1193                                 "not found\n", u->pe_name);
1194                         ret = -ENOENT;
1195                         goto out_err;
1196                 }
1197         }
1198
1199 #ifdef CONFIG_IP_VS_IPV6
1200         if (u->af == AF_INET6) {
1201                 __u32 plen = (__force __u32) u->netmask;
1202
1203                 if (plen < 1 || plen > 128) {
1204                         ret = -EINVAL;
1205                         goto out_err;
1206                 }
1207         }
1208 #endif
1209
1210         svc = kzalloc(sizeof(struct ip_vs_service), GFP_KERNEL);
1211         if (svc == NULL) {
1212                 IP_VS_DBG(1, "%s(): no memory\n", __func__);
1213                 ret = -ENOMEM;
1214                 goto out_err;
1215         }
1216         svc->stats.cpustats = alloc_percpu(struct ip_vs_cpu_stats);
1217         if (!svc->stats.cpustats) {
1218                 ret = -ENOMEM;
1219                 goto out_err;
1220         }
1221
1222         for_each_possible_cpu(i) {
1223                 struct ip_vs_cpu_stats *ip_vs_stats;
1224                 ip_vs_stats = per_cpu_ptr(svc->stats.cpustats, i);
1225                 u64_stats_init(&ip_vs_stats->syncp);
1226         }
1227
1228
1229         /* I'm the first user of the service */
1230         atomic_set(&svc->refcnt, 0);
1231
1232         svc->af = u->af;
1233         svc->protocol = u->protocol;
1234         ip_vs_addr_copy(svc->af, &svc->addr, &u->addr);
1235         svc->port = u->port;
1236         svc->fwmark = u->fwmark;
1237         svc->flags = u->flags;
1238         svc->timeout = u->timeout * HZ;
1239         svc->netmask = u->netmask;
1240         svc->net = net;
1241
1242         INIT_LIST_HEAD(&svc->destinations);
1243         spin_lock_init(&svc->sched_lock);
1244         spin_lock_init(&svc->stats.lock);
1245
1246         /* Bind the scheduler */
1247         if (sched) {
1248                 ret = ip_vs_bind_scheduler(svc, sched);
1249                 if (ret)
1250                         goto out_err;
1251                 sched = NULL;
1252         }
1253
1254         /* Bind the ct retriever */
1255         RCU_INIT_POINTER(svc->pe, pe);
1256         pe = NULL;
1257
1258         /* Update the virtual service counters */
1259         if (svc->port == FTPPORT)
1260                 atomic_inc(&ipvs->ftpsvc_counter);
1261         else if (svc->port == 0)
1262                 atomic_inc(&ipvs->nullsvc_counter);
1263
1264         ip_vs_start_estimator(net, &svc->stats);
1265
1266         /* Count only IPv4 services for old get/setsockopt interface */
1267         if (svc->af == AF_INET)
1268                 ipvs->num_services++;
1269
1270         /* Hash the service into the service table */
1271         ip_vs_svc_hash(svc);
1272
1273         *svc_p = svc;
1274         /* Now there is a service - full throttle */
1275         ipvs->enable = 1;
1276         return 0;
1277
1278
1279  out_err:
1280         if (svc != NULL) {
1281                 ip_vs_unbind_scheduler(svc, sched);
1282                 ip_vs_service_free(svc);
1283         }
1284         ip_vs_scheduler_put(sched);
1285         ip_vs_pe_put(pe);
1286
1287         /* decrease the module use count */
1288         ip_vs_use_count_dec();
1289
1290         return ret;
1291 }
1292
1293
1294 /*
1295  *      Edit a service and bind it with a new scheduler
1296  */
1297 static int
1298 ip_vs_edit_service(struct ip_vs_service *svc, struct ip_vs_service_user_kern *u)
1299 {
1300         struct ip_vs_scheduler *sched = NULL, *old_sched;
1301         struct ip_vs_pe *pe = NULL, *old_pe = NULL;
1302         int ret = 0;
1303
1304         /*
1305          * Lookup the scheduler, by 'u->sched_name'
1306          */
1307         if (strcmp(u->sched_name, "none")) {
1308                 sched = ip_vs_scheduler_get(u->sched_name);
1309                 if (!sched) {
1310                         pr_info("Scheduler module ip_vs_%s not found\n",
1311                                 u->sched_name);
1312                         return -ENOENT;
1313                 }
1314         }
1315         old_sched = sched;
1316
1317         if (u->pe_name && *u->pe_name) {
1318                 pe = ip_vs_pe_getbyname(u->pe_name);
1319                 if (pe == NULL) {
1320                         pr_info("persistence engine module ip_vs_pe_%s "
1321                                 "not found\n", u->pe_name);
1322                         ret = -ENOENT;
1323                         goto out;
1324                 }
1325                 old_pe = pe;
1326         }
1327
1328 #ifdef CONFIG_IP_VS_IPV6
1329         if (u->af == AF_INET6) {
1330                 __u32 plen = (__force __u32) u->netmask;
1331
1332                 if (plen < 1 || plen > 128) {
1333                         ret = -EINVAL;
1334                         goto out;
1335                 }
1336         }
1337 #endif
1338
1339         old_sched = rcu_dereference_protected(svc->scheduler, 1);
1340         if (sched != old_sched) {
1341                 if (old_sched) {
1342                         ip_vs_unbind_scheduler(svc, old_sched);
1343                         RCU_INIT_POINTER(svc->scheduler, NULL);
1344                         /* Wait all svc->sched_data users */
1345                         synchronize_rcu();
1346                 }
1347                 /* Bind the new scheduler */
1348                 if (sched) {
1349                         ret = ip_vs_bind_scheduler(svc, sched);
1350                         if (ret) {
1351                                 ip_vs_scheduler_put(sched);
1352                                 goto out;
1353                         }
1354                 }
1355         }
1356
1357         /*
1358          * Set the flags and timeout value
1359          */
1360         svc->flags = u->flags | IP_VS_SVC_F_HASHED;
1361         svc->timeout = u->timeout * HZ;
1362         svc->netmask = u->netmask;
1363
1364         old_pe = rcu_dereference_protected(svc->pe, 1);
1365         if (pe != old_pe)
1366                 rcu_assign_pointer(svc->pe, pe);
1367
1368 out:
1369         ip_vs_scheduler_put(old_sched);
1370         ip_vs_pe_put(old_pe);
1371         return ret;
1372 }
1373
1374 /*
1375  *      Delete a service from the service list
1376  *      - The service must be unlinked, unlocked and not referenced!
1377  *      - We are called under _bh lock
1378  */
1379 static void __ip_vs_del_service(struct ip_vs_service *svc, bool cleanup)
1380 {
1381         struct ip_vs_dest *dest, *nxt;
1382         struct ip_vs_scheduler *old_sched;
1383         struct ip_vs_pe *old_pe;
1384         struct netns_ipvs *ipvs = net_ipvs(svc->net);
1385
1386         pr_info("%s: enter\n", __func__);
1387
1388         /* Count only IPv4 services for old get/setsockopt interface */
1389         if (svc->af == AF_INET)
1390                 ipvs->num_services--;
1391
1392         ip_vs_stop_estimator(svc->net, &svc->stats);
1393
1394         /* Unbind scheduler */
1395         old_sched = rcu_dereference_protected(svc->scheduler, 1);
1396         ip_vs_unbind_scheduler(svc, old_sched);
1397         ip_vs_scheduler_put(old_sched);
1398
1399         /* Unbind persistence engine, keep svc->pe */
1400         old_pe = rcu_dereference_protected(svc->pe, 1);
1401         ip_vs_pe_put(old_pe);
1402
1403         /*
1404          *    Unlink the whole destination list
1405          */
1406         list_for_each_entry_safe(dest, nxt, &svc->destinations, n_list) {
1407                 __ip_vs_unlink_dest(svc, dest, 0);
1408                 __ip_vs_del_dest(svc->net, dest, cleanup);
1409         }
1410
1411         /*
1412          *    Update the virtual service counters
1413          */
1414         if (svc->port == FTPPORT)
1415                 atomic_dec(&ipvs->ftpsvc_counter);
1416         else if (svc->port == 0)
1417                 atomic_dec(&ipvs->nullsvc_counter);
1418
1419         /*
1420          *    Free the service if nobody refers to it
1421          */
1422         __ip_vs_svc_put(svc, true);
1423
1424         /* decrease the module use count */
1425         ip_vs_use_count_dec();
1426 }
1427
1428 /*
1429  * Unlink a service from list and try to delete it if its refcnt reached 0
1430  */
1431 static void ip_vs_unlink_service(struct ip_vs_service *svc, bool cleanup)
1432 {
1433         /* Hold svc to avoid double release from dest_trash */
1434         atomic_inc(&svc->refcnt);
1435         /*
1436          * Unhash it from the service table
1437          */
1438         ip_vs_svc_unhash(svc);
1439
1440         __ip_vs_del_service(svc, cleanup);
1441 }
1442
1443 /*
1444  *      Delete a service from the service list
1445  */
1446 static int ip_vs_del_service(struct ip_vs_service *svc)
1447 {
1448         if (svc == NULL)
1449                 return -EEXIST;
1450         ip_vs_unlink_service(svc, false);
1451
1452         return 0;
1453 }
1454
1455
1456 /*
1457  *      Flush all the virtual services
1458  */
1459 static int ip_vs_flush(struct net *net, bool cleanup)
1460 {
1461         int idx;
1462         struct ip_vs_service *svc;
1463         struct hlist_node *n;
1464
1465         /*
1466          * Flush the service table hashed by <netns,protocol,addr,port>
1467          */
1468         for(idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
1469                 hlist_for_each_entry_safe(svc, n, &ip_vs_svc_table[idx],
1470                                           s_list) {
1471                         if (net_eq(svc->net, net))
1472                                 ip_vs_unlink_service(svc, cleanup);
1473                 }
1474         }
1475
1476         /*
1477          * Flush the service table hashed by fwmark
1478          */
1479         for(idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
1480                 hlist_for_each_entry_safe(svc, n, &ip_vs_svc_fwm_table[idx],
1481                                           f_list) {
1482                         if (net_eq(svc->net, net))
1483                                 ip_vs_unlink_service(svc, cleanup);
1484                 }
1485         }
1486
1487         return 0;
1488 }
1489
1490 /*
1491  *      Delete service by {netns} in the service table.
1492  *      Called by __ip_vs_cleanup()
1493  */
1494 void ip_vs_service_net_cleanup(struct net *net)
1495 {
1496         EnterFunction(2);
1497         /* Check for "full" addressed entries */
1498         mutex_lock(&__ip_vs_mutex);
1499         ip_vs_flush(net, true);
1500         mutex_unlock(&__ip_vs_mutex);
1501         LeaveFunction(2);
1502 }
1503
1504 /* Put all references for device (dst_cache) */
1505 static inline void
1506 ip_vs_forget_dev(struct ip_vs_dest *dest, struct net_device *dev)
1507 {
1508         struct ip_vs_dest_dst *dest_dst;
1509
1510         spin_lock_bh(&dest->dst_lock);
1511         dest_dst = rcu_dereference_protected(dest->dest_dst, 1);
1512         if (dest_dst && dest_dst->dst_cache->dev == dev) {
1513                 IP_VS_DBG_BUF(3, "Reset dev:%s dest %s:%u ,dest->refcnt=%d\n",
1514                               dev->name,
1515                               IP_VS_DBG_ADDR(dest->af, &dest->addr),
1516                               ntohs(dest->port),
1517                               atomic_read(&dest->refcnt));
1518                 __ip_vs_dst_cache_reset(dest);
1519         }
1520         spin_unlock_bh(&dest->dst_lock);
1521
1522 }
1523 /* Netdev event receiver
1524  * Currently only NETDEV_DOWN is handled to release refs to cached dsts
1525  */
1526 static int ip_vs_dst_event(struct notifier_block *this, unsigned long event,
1527                            void *ptr)
1528 {
1529         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1530         struct net *net = dev_net(dev);
1531         struct netns_ipvs *ipvs = net_ipvs(net);
1532         struct ip_vs_service *svc;
1533         struct ip_vs_dest *dest;
1534         unsigned int idx;
1535
1536         if (event != NETDEV_DOWN || !ipvs)
1537                 return NOTIFY_DONE;
1538         IP_VS_DBG(3, "%s() dev=%s\n", __func__, dev->name);
1539         EnterFunction(2);
1540         mutex_lock(&__ip_vs_mutex);
1541         for (idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
1542                 hlist_for_each_entry(svc, &ip_vs_svc_table[idx], s_list) {
1543                         if (net_eq(svc->net, net)) {
1544                                 list_for_each_entry(dest, &svc->destinations,
1545                                                     n_list) {
1546                                         ip_vs_forget_dev(dest, dev);
1547                                 }
1548                         }
1549                 }
1550
1551                 hlist_for_each_entry(svc, &ip_vs_svc_fwm_table[idx], f_list) {
1552                         if (net_eq(svc->net, net)) {
1553                                 list_for_each_entry(dest, &svc->destinations,
1554                                                     n_list) {
1555                                         ip_vs_forget_dev(dest, dev);
1556                                 }
1557                         }
1558
1559                 }
1560         }
1561
1562         spin_lock_bh(&ipvs->dest_trash_lock);
1563         list_for_each_entry(dest, &ipvs->dest_trash, t_list) {
1564                 ip_vs_forget_dev(dest, dev);
1565         }
1566         spin_unlock_bh(&ipvs->dest_trash_lock);
1567         mutex_unlock(&__ip_vs_mutex);
1568         LeaveFunction(2);
1569         return NOTIFY_DONE;
1570 }
1571
1572 /*
1573  *      Zero counters in a service or all services
1574  */
1575 static int ip_vs_zero_service(struct ip_vs_service *svc)
1576 {
1577         struct ip_vs_dest *dest;
1578
1579         list_for_each_entry(dest, &svc->destinations, n_list) {
1580                 ip_vs_zero_stats(&dest->stats);
1581         }
1582         ip_vs_zero_stats(&svc->stats);
1583         return 0;
1584 }
1585
1586 static int ip_vs_zero_all(struct net *net)
1587 {
1588         int idx;
1589         struct ip_vs_service *svc;
1590
1591         for(idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
1592                 hlist_for_each_entry(svc, &ip_vs_svc_table[idx], s_list) {
1593                         if (net_eq(svc->net, net))
1594                                 ip_vs_zero_service(svc);
1595                 }
1596         }
1597
1598         for(idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
1599                 hlist_for_each_entry(svc, &ip_vs_svc_fwm_table[idx], f_list) {
1600                         if (net_eq(svc->net, net))
1601                                 ip_vs_zero_service(svc);
1602                 }
1603         }
1604
1605         ip_vs_zero_stats(&net_ipvs(net)->tot_stats);
1606         return 0;
1607 }
1608
1609 #ifdef CONFIG_SYSCTL
1610
1611 static int zero;
1612 static int three = 3;
1613
1614 static int
1615 proc_do_defense_mode(struct ctl_table *table, int write,
1616                      void __user *buffer, size_t *lenp, loff_t *ppos)
1617 {
1618         struct net *net = current->nsproxy->net_ns;
1619         int *valp = table->data;
1620         int val = *valp;
1621         int rc;
1622
1623         rc = proc_dointvec(table, write, buffer, lenp, ppos);
1624         if (write && (*valp != val)) {
1625                 if ((*valp < 0) || (*valp > 3)) {
1626                         /* Restore the correct value */
1627                         *valp = val;
1628                 } else {
1629                         update_defense_level(net_ipvs(net));
1630                 }
1631         }
1632         return rc;
1633 }
1634
1635 static int
1636 proc_do_sync_threshold(struct ctl_table *table, int write,
1637                        void __user *buffer, size_t *lenp, loff_t *ppos)
1638 {
1639         int *valp = table->data;
1640         int val[2];
1641         int rc;
1642
1643         /* backup the value first */
1644         memcpy(val, valp, sizeof(val));
1645
1646         rc = proc_dointvec(table, write, buffer, lenp, ppos);
1647         if (write && (valp[0] < 0 || valp[1] < 0 ||
1648             (valp[0] >= valp[1] && valp[1]))) {
1649                 /* Restore the correct value */
1650                 memcpy(valp, val, sizeof(val));
1651         }
1652         return rc;
1653 }
1654
1655 static int
1656 proc_do_sync_mode(struct ctl_table *table, int write,
1657                      void __user *buffer, size_t *lenp, loff_t *ppos)
1658 {
1659         int *valp = table->data;
1660         int val = *valp;
1661         int rc;
1662
1663         rc = proc_dointvec(table, write, buffer, lenp, ppos);
1664         if (write && (*valp != val)) {
1665                 if ((*valp < 0) || (*valp > 1)) {
1666                         /* Restore the correct value */
1667                         *valp = val;
1668                 }
1669         }
1670         return rc;
1671 }
1672
1673 static int
1674 proc_do_sync_ports(struct ctl_table *table, int write,
1675                    void __user *buffer, size_t *lenp, loff_t *ppos)
1676 {
1677         int *valp = table->data;
1678         int val = *valp;
1679         int rc;
1680
1681         rc = proc_dointvec(table, write, buffer, lenp, ppos);
1682         if (write && (*valp != val)) {
1683                 if (*valp < 1 || !is_power_of_2(*valp)) {
1684                         /* Restore the correct value */
1685                         *valp = val;
1686                 }
1687         }
1688         return rc;
1689 }
1690
1691 /*
1692  *      IPVS sysctl table (under the /proc/sys/net/ipv4/vs/)
1693  *      Do not change order or insert new entries without
1694  *      align with netns init in ip_vs_control_net_init()
1695  */
1696
1697 static struct ctl_table vs_vars[] = {
1698         {
1699                 .procname       = "amemthresh",
1700                 .maxlen         = sizeof(int),
1701                 .mode           = 0644,
1702                 .proc_handler   = proc_dointvec,
1703         },
1704         {
1705                 .procname       = "am_droprate",
1706                 .maxlen         = sizeof(int),
1707                 .mode           = 0644,
1708                 .proc_handler   = proc_dointvec,
1709         },
1710         {
1711                 .procname       = "drop_entry",
1712                 .maxlen         = sizeof(int),
1713                 .mode           = 0644,
1714                 .proc_handler   = proc_do_defense_mode,
1715         },
1716         {
1717                 .procname       = "drop_packet",
1718                 .maxlen         = sizeof(int),
1719                 .mode           = 0644,
1720                 .proc_handler   = proc_do_defense_mode,
1721         },
1722 #ifdef CONFIG_IP_VS_NFCT
1723         {
1724                 .procname       = "conntrack",
1725                 .maxlen         = sizeof(int),
1726                 .mode           = 0644,
1727                 .proc_handler   = &proc_dointvec,
1728         },
1729 #endif
1730         {
1731                 .procname       = "secure_tcp",
1732                 .maxlen         = sizeof(int),
1733                 .mode           = 0644,
1734                 .proc_handler   = proc_do_defense_mode,
1735         },
1736         {
1737                 .procname       = "snat_reroute",
1738                 .maxlen         = sizeof(int),
1739                 .mode           = 0644,
1740                 .proc_handler   = &proc_dointvec,
1741         },
1742         {
1743                 .procname       = "sync_version",
1744                 .maxlen         = sizeof(int),
1745                 .mode           = 0644,
1746                 .proc_handler   = &proc_do_sync_mode,
1747         },
1748         {
1749                 .procname       = "sync_ports",
1750                 .maxlen         = sizeof(int),
1751                 .mode           = 0644,
1752                 .proc_handler   = &proc_do_sync_ports,
1753         },
1754         {
1755                 .procname       = "sync_persist_mode",
1756                 .maxlen         = sizeof(int),
1757                 .mode           = 0644,
1758                 .proc_handler   = proc_dointvec,
1759         },
1760         {
1761                 .procname       = "sync_qlen_max",
1762                 .maxlen         = sizeof(unsigned long),
1763                 .mode           = 0644,
1764                 .proc_handler   = proc_doulongvec_minmax,
1765         },
1766         {
1767                 .procname       = "sync_sock_size",
1768                 .maxlen         = sizeof(int),
1769                 .mode           = 0644,
1770                 .proc_handler   = proc_dointvec,
1771         },
1772         {
1773                 .procname       = "cache_bypass",
1774                 .maxlen         = sizeof(int),
1775                 .mode           = 0644,
1776                 .proc_handler   = proc_dointvec,
1777         },
1778         {
1779                 .procname       = "expire_nodest_conn",
1780                 .maxlen         = sizeof(int),
1781                 .mode           = 0644,
1782                 .proc_handler   = proc_dointvec,
1783         },
1784         {
1785                 .procname       = "sloppy_tcp",
1786                 .maxlen         = sizeof(int),
1787                 .mode           = 0644,
1788                 .proc_handler   = proc_dointvec,
1789         },
1790         {
1791                 .procname       = "sloppy_sctp",
1792                 .maxlen         = sizeof(int),
1793                 .mode           = 0644,
1794                 .proc_handler   = proc_dointvec,
1795         },
1796         {
1797                 .procname       = "expire_quiescent_template",
1798                 .maxlen         = sizeof(int),
1799                 .mode           = 0644,
1800                 .proc_handler   = proc_dointvec,
1801         },
1802         {
1803                 .procname       = "sync_threshold",
1804                 .maxlen         =
1805                         sizeof(((struct netns_ipvs *)0)->sysctl_sync_threshold),
1806                 .mode           = 0644,
1807                 .proc_handler   = proc_do_sync_threshold,
1808         },
1809         {
1810                 .procname       = "sync_refresh_period",
1811                 .maxlen         = sizeof(int),
1812                 .mode           = 0644,
1813                 .proc_handler   = proc_dointvec_jiffies,
1814         },
1815         {
1816                 .procname       = "sync_retries",
1817                 .maxlen         = sizeof(int),
1818                 .mode           = 0644,
1819                 .proc_handler   = proc_dointvec_minmax,
1820                 .extra1         = &zero,
1821                 .extra2         = &three,
1822         },
1823         {
1824                 .procname       = "nat_icmp_send",
1825                 .maxlen         = sizeof(int),
1826                 .mode           = 0644,
1827                 .proc_handler   = proc_dointvec,
1828         },
1829         {
1830                 .procname       = "pmtu_disc",
1831                 .maxlen         = sizeof(int),
1832                 .mode           = 0644,
1833                 .proc_handler   = proc_dointvec,
1834         },
1835         {
1836                 .procname       = "backup_only",
1837                 .maxlen         = sizeof(int),
1838                 .mode           = 0644,
1839                 .proc_handler   = proc_dointvec,
1840         },
1841         {
1842                 .procname       = "conn_reuse_mode",
1843                 .maxlen         = sizeof(int),
1844                 .mode           = 0644,
1845                 .proc_handler   = proc_dointvec,
1846         },
1847 #ifdef CONFIG_IP_VS_DEBUG
1848         {
1849                 .procname       = "debug_level",
1850                 .data           = &sysctl_ip_vs_debug_level,
1851                 .maxlen         = sizeof(int),
1852                 .mode           = 0644,
1853                 .proc_handler   = proc_dointvec,
1854         },
1855 #endif
1856         { }
1857 };
1858
1859 #endif
1860
1861 #ifdef CONFIG_PROC_FS
1862
1863 struct ip_vs_iter {
1864         struct seq_net_private p;  /* Do not move this, netns depends upon it*/
1865         struct hlist_head *table;
1866         int bucket;
1867 };
1868
1869 /*
1870  *      Write the contents of the VS rule table to a PROCfs file.
1871  *      (It is kept just for backward compatibility)
1872  */
1873 static inline const char *ip_vs_fwd_name(unsigned int flags)
1874 {
1875         switch (flags & IP_VS_CONN_F_FWD_MASK) {
1876         case IP_VS_CONN_F_LOCALNODE:
1877                 return "Local";
1878         case IP_VS_CONN_F_TUNNEL:
1879                 return "Tunnel";
1880         case IP_VS_CONN_F_DROUTE:
1881                 return "Route";
1882         default:
1883                 return "Masq";
1884         }
1885 }
1886
1887
1888 /* Get the Nth entry in the two lists */
1889 static struct ip_vs_service *ip_vs_info_array(struct seq_file *seq, loff_t pos)
1890 {
1891         struct net *net = seq_file_net(seq);
1892         struct ip_vs_iter *iter = seq->private;
1893         int idx;
1894         struct ip_vs_service *svc;
1895
1896         /* look in hash by protocol */
1897         for (idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
1898                 hlist_for_each_entry_rcu(svc, &ip_vs_svc_table[idx], s_list) {
1899                         if (net_eq(svc->net, net) && pos-- == 0) {
1900                                 iter->table = ip_vs_svc_table;
1901                                 iter->bucket = idx;
1902                                 return svc;
1903                         }
1904                 }
1905         }
1906
1907         /* keep looking in fwmark */
1908         for (idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
1909                 hlist_for_each_entry_rcu(svc, &ip_vs_svc_fwm_table[idx],
1910                                          f_list) {
1911                         if (net_eq(svc->net, net) && pos-- == 0) {
1912                                 iter->table = ip_vs_svc_fwm_table;
1913                                 iter->bucket = idx;
1914                                 return svc;
1915                         }
1916                 }
1917         }
1918
1919         return NULL;
1920 }
1921
1922 static void *ip_vs_info_seq_start(struct seq_file *seq, loff_t *pos)
1923         __acquires(RCU)
1924 {
1925         rcu_read_lock();
1926         return *pos ? ip_vs_info_array(seq, *pos - 1) : SEQ_START_TOKEN;
1927 }
1928
1929
1930 static void *ip_vs_info_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1931 {
1932         struct hlist_node *e;
1933         struct ip_vs_iter *iter;
1934         struct ip_vs_service *svc;
1935
1936         ++*pos;
1937         if (v == SEQ_START_TOKEN)
1938                 return ip_vs_info_array(seq,0);
1939
1940         svc = v;
1941         iter = seq->private;
1942
1943         if (iter->table == ip_vs_svc_table) {
1944                 /* next service in table hashed by protocol */
1945                 e = rcu_dereference(hlist_next_rcu(&svc->s_list));
1946                 if (e)
1947                         return hlist_entry(e, struct ip_vs_service, s_list);
1948
1949                 while (++iter->bucket < IP_VS_SVC_TAB_SIZE) {
1950                         hlist_for_each_entry_rcu(svc,
1951                                                  &ip_vs_svc_table[iter->bucket],
1952                                                  s_list) {
1953                                 return svc;
1954                         }
1955                 }
1956
1957                 iter->table = ip_vs_svc_fwm_table;
1958                 iter->bucket = -1;
1959                 goto scan_fwmark;
1960         }
1961
1962         /* next service in hashed by fwmark */
1963         e = rcu_dereference(hlist_next_rcu(&svc->f_list));
1964         if (e)
1965                 return hlist_entry(e, struct ip_vs_service, f_list);
1966
1967  scan_fwmark:
1968         while (++iter->bucket < IP_VS_SVC_TAB_SIZE) {
1969                 hlist_for_each_entry_rcu(svc,
1970                                          &ip_vs_svc_fwm_table[iter->bucket],
1971                                          f_list)
1972                         return svc;
1973         }
1974
1975         return NULL;
1976 }
1977
1978 static void ip_vs_info_seq_stop(struct seq_file *seq, void *v)
1979         __releases(RCU)
1980 {
1981         rcu_read_unlock();
1982 }
1983
1984
1985 static int ip_vs_info_seq_show(struct seq_file *seq, void *v)
1986 {
1987         if (v == SEQ_START_TOKEN) {
1988                 seq_printf(seq,
1989                         "IP Virtual Server version %d.%d.%d (size=%d)\n",
1990                         NVERSION(IP_VS_VERSION_CODE), ip_vs_conn_tab_size);
1991                 seq_puts(seq,
1992                          "Prot LocalAddress:Port Scheduler Flags\n");
1993                 seq_puts(seq,
1994                          "  -> RemoteAddress:Port Forward Weight ActiveConn InActConn\n");
1995         } else {
1996                 const struct ip_vs_service *svc = v;
1997                 const struct ip_vs_iter *iter = seq->private;
1998                 const struct ip_vs_dest *dest;
1999                 struct ip_vs_scheduler *sched = rcu_dereference(svc->scheduler);
2000                 char *sched_name = sched ? sched->name : "none";
2001
2002                 if (iter->table == ip_vs_svc_table) {
2003 #ifdef CONFIG_IP_VS_IPV6
2004                         if (svc->af == AF_INET6)
2005                                 seq_printf(seq, "%s  [%pI6]:%04X %s ",
2006                                            ip_vs_proto_name(svc->protocol),
2007                                            &svc->addr.in6,
2008                                            ntohs(svc->port),
2009                                            sched_name);
2010                         else
2011 #endif
2012                                 seq_printf(seq, "%s  %08X:%04X %s %s ",
2013                                            ip_vs_proto_name(svc->protocol),
2014                                            ntohl(svc->addr.ip),
2015                                            ntohs(svc->port),
2016                                            sched_name,
2017                                            (svc->flags & IP_VS_SVC_F_ONEPACKET)?"ops ":"");
2018                 } else {
2019                         seq_printf(seq, "FWM  %08X %s %s",
2020                                    svc->fwmark, sched_name,
2021                                    (svc->flags & IP_VS_SVC_F_ONEPACKET)?"ops ":"");
2022                 }
2023
2024                 if (svc->flags & IP_VS_SVC_F_PERSISTENT)
2025                         seq_printf(seq, "persistent %d %08X\n",
2026                                 svc->timeout,
2027                                 ntohl(svc->netmask));
2028                 else
2029                         seq_putc(seq, '\n');
2030
2031                 list_for_each_entry_rcu(dest, &svc->destinations, n_list) {
2032 #ifdef CONFIG_IP_VS_IPV6
2033                         if (dest->af == AF_INET6)
2034                                 seq_printf(seq,
2035                                            "  -> [%pI6]:%04X"
2036                                            "      %-7s %-6d %-10d %-10d\n",
2037                                            &dest->addr.in6,
2038                                            ntohs(dest->port),
2039                                            ip_vs_fwd_name(atomic_read(&dest->conn_flags)),
2040                                            atomic_read(&dest->weight),
2041                                            atomic_read(&dest->activeconns),
2042                                            atomic_read(&dest->inactconns));
2043                         else
2044 #endif
2045                                 seq_printf(seq,
2046                                            "  -> %08X:%04X      "
2047                                            "%-7s %-6d %-10d %-10d\n",
2048                                            ntohl(dest->addr.ip),
2049                                            ntohs(dest->port),
2050                                            ip_vs_fwd_name(atomic_read(&dest->conn_flags)),
2051                                            atomic_read(&dest->weight),
2052                                            atomic_read(&dest->activeconns),
2053                                            atomic_read(&dest->inactconns));
2054
2055                 }
2056         }
2057         return 0;
2058 }
2059
2060 static const struct seq_operations ip_vs_info_seq_ops = {
2061         .start = ip_vs_info_seq_start,
2062         .next  = ip_vs_info_seq_next,
2063         .stop  = ip_vs_info_seq_stop,
2064         .show  = ip_vs_info_seq_show,
2065 };
2066
2067 static int ip_vs_info_open(struct inode *inode, struct file *file)
2068 {
2069         return seq_open_net(inode, file, &ip_vs_info_seq_ops,
2070                         sizeof(struct ip_vs_iter));
2071 }
2072
2073 static const struct file_operations ip_vs_info_fops = {
2074         .owner   = THIS_MODULE,
2075         .open    = ip_vs_info_open,
2076         .read    = seq_read,
2077         .llseek  = seq_lseek,
2078         .release = seq_release_net,
2079 };
2080
2081 static int ip_vs_stats_show(struct seq_file *seq, void *v)
2082 {
2083         struct net *net = seq_file_single_net(seq);
2084         struct ip_vs_kstats show;
2085
2086 /*               01234567 01234567 01234567 0123456701234567 0123456701234567 */
2087         seq_puts(seq,
2088                  "   Total Incoming Outgoing         Incoming         Outgoing\n");
2089         seq_printf(seq,
2090                    "   Conns  Packets  Packets            Bytes            Bytes\n");
2091
2092         ip_vs_copy_stats(&show, &net_ipvs(net)->tot_stats);
2093         seq_printf(seq, "%8LX %8LX %8LX %16LX %16LX\n\n",
2094                    (unsigned long long)show.conns,
2095                    (unsigned long long)show.inpkts,
2096                    (unsigned long long)show.outpkts,
2097                    (unsigned long long)show.inbytes,
2098                    (unsigned long long)show.outbytes);
2099
2100 /*                01234567 01234567 01234567 0123456701234567 0123456701234567*/
2101         seq_puts(seq,
2102                  " Conns/s   Pkts/s   Pkts/s          Bytes/s          Bytes/s\n");
2103         seq_printf(seq, "%8LX %8LX %8LX %16LX %16LX\n",
2104                    (unsigned long long)show.cps,
2105                    (unsigned long long)show.inpps,
2106                    (unsigned long long)show.outpps,
2107                    (unsigned long long)show.inbps,
2108                    (unsigned long long)show.outbps);
2109
2110         return 0;
2111 }
2112
2113 static int ip_vs_stats_seq_open(struct inode *inode, struct file *file)
2114 {
2115         return single_open_net(inode, file, ip_vs_stats_show);
2116 }
2117
2118 static const struct file_operations ip_vs_stats_fops = {
2119         .owner = THIS_MODULE,
2120         .open = ip_vs_stats_seq_open,
2121         .read = seq_read,
2122         .llseek = seq_lseek,
2123         .release = single_release_net,
2124 };
2125
2126 static int ip_vs_stats_percpu_show(struct seq_file *seq, void *v)
2127 {
2128         struct net *net = seq_file_single_net(seq);
2129         struct ip_vs_stats *tot_stats = &net_ipvs(net)->tot_stats;
2130         struct ip_vs_cpu_stats __percpu *cpustats = tot_stats->cpustats;
2131         struct ip_vs_kstats kstats;
2132         int i;
2133
2134 /*               01234567 01234567 01234567 0123456701234567 0123456701234567 */
2135         seq_puts(seq,
2136                  "       Total Incoming Outgoing         Incoming         Outgoing\n");
2137         seq_printf(seq,
2138                    "CPU    Conns  Packets  Packets            Bytes            Bytes\n");
2139
2140         for_each_possible_cpu(i) {
2141                 struct ip_vs_cpu_stats *u = per_cpu_ptr(cpustats, i);
2142                 unsigned int start;
2143                 u64 conns, inpkts, outpkts, inbytes, outbytes;
2144
2145                 do {
2146                         start = u64_stats_fetch_begin_irq(&u->syncp);
2147                         conns = u->cnt.conns;
2148                         inpkts = u->cnt.inpkts;
2149                         outpkts = u->cnt.outpkts;
2150                         inbytes = u->cnt.inbytes;
2151                         outbytes = u->cnt.outbytes;
2152                 } while (u64_stats_fetch_retry_irq(&u->syncp, start));
2153
2154                 seq_printf(seq, "%3X %8LX %8LX %8LX %16LX %16LX\n",
2155                            i, (u64)conns, (u64)inpkts,
2156                            (u64)outpkts, (u64)inbytes,
2157                            (u64)outbytes);
2158         }
2159
2160         ip_vs_copy_stats(&kstats, tot_stats);
2161
2162         seq_printf(seq, "  ~ %8LX %8LX %8LX %16LX %16LX\n\n",
2163                    (unsigned long long)kstats.conns,
2164                    (unsigned long long)kstats.inpkts,
2165                    (unsigned long long)kstats.outpkts,
2166                    (unsigned long long)kstats.inbytes,
2167                    (unsigned long long)kstats.outbytes);
2168
2169 /*                ... 01234567 01234567 01234567 0123456701234567 0123456701234567 */
2170         seq_puts(seq,
2171                  "     Conns/s   Pkts/s   Pkts/s          Bytes/s          Bytes/s\n");
2172         seq_printf(seq, "    %8LX %8LX %8LX %16LX %16LX\n",
2173                    kstats.cps,
2174                    kstats.inpps,
2175                    kstats.outpps,
2176                    kstats.inbps,
2177                    kstats.outbps);
2178
2179         return 0;
2180 }
2181
2182 static int ip_vs_stats_percpu_seq_open(struct inode *inode, struct file *file)
2183 {
2184         return single_open_net(inode, file, ip_vs_stats_percpu_show);
2185 }
2186
2187 static const struct file_operations ip_vs_stats_percpu_fops = {
2188         .owner = THIS_MODULE,
2189         .open = ip_vs_stats_percpu_seq_open,
2190         .read = seq_read,
2191         .llseek = seq_lseek,
2192         .release = single_release_net,
2193 };
2194 #endif
2195
2196 /*
2197  *      Set timeout values for tcp tcpfin udp in the timeout_table.
2198  */
2199 static int ip_vs_set_timeout(struct net *net, struct ip_vs_timeout_user *u)
2200 {
2201 #if defined(CONFIG_IP_VS_PROTO_TCP) || defined(CONFIG_IP_VS_PROTO_UDP)
2202         struct ip_vs_proto_data *pd;
2203 #endif
2204
2205         IP_VS_DBG(2, "Setting timeout tcp:%d tcpfin:%d udp:%d\n",
2206                   u->tcp_timeout,
2207                   u->tcp_fin_timeout,
2208                   u->udp_timeout);
2209
2210 #ifdef CONFIG_IP_VS_PROTO_TCP
2211         if (u->tcp_timeout) {
2212                 pd = ip_vs_proto_data_get(net, IPPROTO_TCP);
2213                 pd->timeout_table[IP_VS_TCP_S_ESTABLISHED]
2214                         = u->tcp_timeout * HZ;
2215         }
2216
2217         if (u->tcp_fin_timeout) {
2218                 pd = ip_vs_proto_data_get(net, IPPROTO_TCP);
2219                 pd->timeout_table[IP_VS_TCP_S_FIN_WAIT]
2220                         = u->tcp_fin_timeout * HZ;
2221         }
2222 #endif
2223
2224 #ifdef CONFIG_IP_VS_PROTO_UDP
2225         if (u->udp_timeout) {
2226                 pd = ip_vs_proto_data_get(net, IPPROTO_UDP);
2227                 pd->timeout_table[IP_VS_UDP_S_NORMAL]
2228                         = u->udp_timeout * HZ;
2229         }
2230 #endif
2231         return 0;
2232 }
2233
2234 #define CMDID(cmd)              (cmd - IP_VS_BASE_CTL)
2235
2236 struct ip_vs_svcdest_user {
2237         struct ip_vs_service_user       s;
2238         struct ip_vs_dest_user          d;
2239 };
2240
2241 static const unsigned char set_arglen[CMDID(IP_VS_SO_SET_MAX) + 1] = {
2242         [CMDID(IP_VS_SO_SET_ADD)]         = sizeof(struct ip_vs_service_user),
2243         [CMDID(IP_VS_SO_SET_EDIT)]        = sizeof(struct ip_vs_service_user),
2244         [CMDID(IP_VS_SO_SET_DEL)]         = sizeof(struct ip_vs_service_user),
2245         [CMDID(IP_VS_SO_SET_ADDDEST)]     = sizeof(struct ip_vs_svcdest_user),
2246         [CMDID(IP_VS_SO_SET_DELDEST)]     = sizeof(struct ip_vs_svcdest_user),
2247         [CMDID(IP_VS_SO_SET_EDITDEST)]    = sizeof(struct ip_vs_svcdest_user),
2248         [CMDID(IP_VS_SO_SET_TIMEOUT)]     = sizeof(struct ip_vs_timeout_user),
2249         [CMDID(IP_VS_SO_SET_STARTDAEMON)] = sizeof(struct ip_vs_daemon_user),
2250         [CMDID(IP_VS_SO_SET_STOPDAEMON)]  = sizeof(struct ip_vs_daemon_user),
2251         [CMDID(IP_VS_SO_SET_ZERO)]        = sizeof(struct ip_vs_service_user),
2252 };
2253
2254 union ip_vs_set_arglen {
2255         struct ip_vs_service_user       field_IP_VS_SO_SET_ADD;
2256         struct ip_vs_service_user       field_IP_VS_SO_SET_EDIT;
2257         struct ip_vs_service_user       field_IP_VS_SO_SET_DEL;
2258         struct ip_vs_svcdest_user       field_IP_VS_SO_SET_ADDDEST;
2259         struct ip_vs_svcdest_user       field_IP_VS_SO_SET_DELDEST;
2260         struct ip_vs_svcdest_user       field_IP_VS_SO_SET_EDITDEST;
2261         struct ip_vs_timeout_user       field_IP_VS_SO_SET_TIMEOUT;
2262         struct ip_vs_daemon_user        field_IP_VS_SO_SET_STARTDAEMON;
2263         struct ip_vs_daemon_user        field_IP_VS_SO_SET_STOPDAEMON;
2264         struct ip_vs_service_user       field_IP_VS_SO_SET_ZERO;
2265 };
2266
2267 #define MAX_SET_ARGLEN  sizeof(union ip_vs_set_arglen)
2268
2269 static void ip_vs_copy_usvc_compat(struct ip_vs_service_user_kern *usvc,
2270                                   struct ip_vs_service_user *usvc_compat)
2271 {
2272         memset(usvc, 0, sizeof(*usvc));
2273
2274         usvc->af                = AF_INET;
2275         usvc->protocol          = usvc_compat->protocol;
2276         usvc->addr.ip           = usvc_compat->addr;
2277         usvc->port              = usvc_compat->port;
2278         usvc->fwmark            = usvc_compat->fwmark;
2279
2280         /* Deep copy of sched_name is not needed here */
2281         usvc->sched_name        = usvc_compat->sched_name;
2282
2283         usvc->flags             = usvc_compat->flags;
2284         usvc->timeout           = usvc_compat->timeout;
2285         usvc->netmask           = usvc_compat->netmask;
2286 }
2287
2288 static void ip_vs_copy_udest_compat(struct ip_vs_dest_user_kern *udest,
2289                                    struct ip_vs_dest_user *udest_compat)
2290 {
2291         memset(udest, 0, sizeof(*udest));
2292
2293         udest->addr.ip          = udest_compat->addr;
2294         udest->port             = udest_compat->port;
2295         udest->conn_flags       = udest_compat->conn_flags;
2296         udest->weight           = udest_compat->weight;
2297         udest->u_threshold      = udest_compat->u_threshold;
2298         udest->l_threshold      = udest_compat->l_threshold;
2299         udest->af               = AF_INET;
2300 }
2301
2302 static int
2303 do_ip_vs_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len)
2304 {
2305         struct net *net = sock_net(sk);
2306         int ret;
2307         unsigned char arg[MAX_SET_ARGLEN];
2308         struct ip_vs_service_user *usvc_compat;
2309         struct ip_vs_service_user_kern usvc;
2310         struct ip_vs_service *svc;
2311         struct ip_vs_dest_user *udest_compat;
2312         struct ip_vs_dest_user_kern udest;
2313         struct netns_ipvs *ipvs = net_ipvs(net);
2314
2315         BUILD_BUG_ON(sizeof(arg) > 255);
2316         if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
2317                 return -EPERM;
2318
2319         if (cmd < IP_VS_BASE_CTL || cmd > IP_VS_SO_SET_MAX)
2320                 return -EINVAL;
2321         if (len != set_arglen[CMDID(cmd)]) {
2322                 IP_VS_DBG(1, "set_ctl: len %u != %u\n",
2323                           len, set_arglen[CMDID(cmd)]);
2324                 return -EINVAL;
2325         }
2326
2327         if (copy_from_user(arg, user, len) != 0)
2328                 return -EFAULT;
2329
2330         /* increase the module use count */
2331         ip_vs_use_count_inc();
2332
2333         /* Handle daemons since they have another lock */
2334         if (cmd == IP_VS_SO_SET_STARTDAEMON ||
2335             cmd == IP_VS_SO_SET_STOPDAEMON) {
2336                 struct ip_vs_daemon_user *dm = (struct ip_vs_daemon_user *)arg;
2337
2338                 if (cmd == IP_VS_SO_SET_STARTDAEMON) {
2339                         struct ipvs_sync_daemon_cfg cfg;
2340
2341                         memset(&cfg, 0, sizeof(cfg));
2342                         strlcpy(cfg.mcast_ifn, dm->mcast_ifn,
2343                                 sizeof(cfg.mcast_ifn));
2344                         cfg.syncid = dm->syncid;
2345                         rtnl_lock();
2346                         mutex_lock(&ipvs->sync_mutex);
2347                         ret = start_sync_thread(net, &cfg, dm->state);
2348                         mutex_unlock(&ipvs->sync_mutex);
2349                         rtnl_unlock();
2350                 } else {
2351                         mutex_lock(&ipvs->sync_mutex);
2352                         ret = stop_sync_thread(net, dm->state);
2353                         mutex_unlock(&ipvs->sync_mutex);
2354                 }
2355                 goto out_dec;
2356         }
2357
2358         mutex_lock(&__ip_vs_mutex);
2359         if (cmd == IP_VS_SO_SET_FLUSH) {
2360                 /* Flush the virtual service */
2361                 ret = ip_vs_flush(net, false);
2362                 goto out_unlock;
2363         } else if (cmd == IP_VS_SO_SET_TIMEOUT) {
2364                 /* Set timeout values for (tcp tcpfin udp) */
2365                 ret = ip_vs_set_timeout(net, (struct ip_vs_timeout_user *)arg);
2366                 goto out_unlock;
2367         }
2368
2369         usvc_compat = (struct ip_vs_service_user *)arg;
2370         udest_compat = (struct ip_vs_dest_user *)(usvc_compat + 1);
2371
2372         /* We only use the new structs internally, so copy userspace compat
2373          * structs to extended internal versions */
2374         ip_vs_copy_usvc_compat(&usvc, usvc_compat);
2375         ip_vs_copy_udest_compat(&udest, udest_compat);
2376
2377         if (cmd == IP_VS_SO_SET_ZERO) {
2378                 /* if no service address is set, zero counters in all */
2379                 if (!usvc.fwmark && !usvc.addr.ip && !usvc.port) {
2380                         ret = ip_vs_zero_all(net);
2381                         goto out_unlock;
2382                 }
2383         }
2384
2385         /* Check for valid protocol: TCP or UDP or SCTP, even for fwmark!=0 */
2386         if (usvc.protocol != IPPROTO_TCP && usvc.protocol != IPPROTO_UDP &&
2387             usvc.protocol != IPPROTO_SCTP) {
2388                 pr_err("set_ctl: invalid protocol: %d %pI4:%d %s\n",
2389                        usvc.protocol, &usvc.addr.ip,
2390                        ntohs(usvc.port), usvc.sched_name);
2391                 ret = -EFAULT;
2392                 goto out_unlock;
2393         }
2394
2395         /* Lookup the exact service by <protocol, addr, port> or fwmark */
2396         rcu_read_lock();
2397         if (usvc.fwmark == 0)
2398                 svc = __ip_vs_service_find(net, usvc.af, usvc.protocol,
2399                                            &usvc.addr, usvc.port);
2400         else
2401                 svc = __ip_vs_svc_fwm_find(net, usvc.af, usvc.fwmark);
2402         rcu_read_unlock();
2403
2404         if (cmd != IP_VS_SO_SET_ADD
2405             && (svc == NULL || svc->protocol != usvc.protocol)) {
2406                 ret = -ESRCH;
2407                 goto out_unlock;
2408         }
2409
2410         switch (cmd) {
2411         case IP_VS_SO_SET_ADD:
2412                 if (svc != NULL)
2413                         ret = -EEXIST;
2414                 else
2415                         ret = ip_vs_add_service(net, &usvc, &svc);
2416                 break;
2417         case IP_VS_SO_SET_EDIT:
2418                 ret = ip_vs_edit_service(svc, &usvc);
2419                 break;
2420         case IP_VS_SO_SET_DEL:
2421                 ret = ip_vs_del_service(svc);
2422                 if (!ret)
2423                         goto out_unlock;
2424                 break;
2425         case IP_VS_SO_SET_ZERO:
2426                 ret = ip_vs_zero_service(svc);
2427                 break;
2428         case IP_VS_SO_SET_ADDDEST:
2429                 ret = ip_vs_add_dest(svc, &udest);
2430                 break;
2431         case IP_VS_SO_SET_EDITDEST:
2432                 ret = ip_vs_edit_dest(svc, &udest);
2433                 break;
2434         case IP_VS_SO_SET_DELDEST:
2435                 ret = ip_vs_del_dest(svc, &udest);
2436                 break;
2437         default:
2438                 ret = -EINVAL;
2439         }
2440
2441   out_unlock:
2442         mutex_unlock(&__ip_vs_mutex);
2443   out_dec:
2444         /* decrease the module use count */
2445         ip_vs_use_count_dec();
2446
2447         return ret;
2448 }
2449
2450
2451 static void
2452 ip_vs_copy_service(struct ip_vs_service_entry *dst, struct ip_vs_service *src)
2453 {
2454         struct ip_vs_scheduler *sched;
2455         struct ip_vs_kstats kstats;
2456         char *sched_name;
2457
2458         sched = rcu_dereference_protected(src->scheduler, 1);
2459         sched_name = sched ? sched->name : "none";
2460         dst->protocol = src->protocol;
2461         dst->addr = src->addr.ip;
2462         dst->port = src->port;
2463         dst->fwmark = src->fwmark;
2464         strlcpy(dst->sched_name, sched_name, sizeof(dst->sched_name));
2465         dst->flags = src->flags;
2466         dst->timeout = src->timeout / HZ;
2467         dst->netmask = src->netmask;
2468         dst->num_dests = src->num_dests;
2469         ip_vs_copy_stats(&kstats, &src->stats);
2470         ip_vs_export_stats_user(&dst->stats, &kstats);
2471 }
2472
2473 static inline int
2474 __ip_vs_get_service_entries(struct net *net,
2475                             const struct ip_vs_get_services *get,
2476                             struct ip_vs_get_services __user *uptr)
2477 {
2478         int idx, count=0;
2479         struct ip_vs_service *svc;
2480         struct ip_vs_service_entry entry;
2481         int ret = 0;
2482
2483         for (idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
2484                 hlist_for_each_entry(svc, &ip_vs_svc_table[idx], s_list) {
2485                         /* Only expose IPv4 entries to old interface */
2486                         if (svc->af != AF_INET || !net_eq(svc->net, net))
2487                                 continue;
2488
2489                         if (count >= get->num_services)
2490                                 goto out;
2491                         memset(&entry, 0, sizeof(entry));
2492                         ip_vs_copy_service(&entry, svc);
2493                         if (copy_to_user(&uptr->entrytable[count],
2494                                          &entry, sizeof(entry))) {
2495                                 ret = -EFAULT;
2496                                 goto out;
2497                         }
2498                         count++;
2499                 }
2500         }
2501
2502         for (idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
2503                 hlist_for_each_entry(svc, &ip_vs_svc_fwm_table[idx], f_list) {
2504                         /* Only expose IPv4 entries to old interface */
2505                         if (svc->af != AF_INET || !net_eq(svc->net, net))
2506                                 continue;
2507
2508                         if (count >= get->num_services)
2509                                 goto out;
2510                         memset(&entry, 0, sizeof(entry));
2511                         ip_vs_copy_service(&entry, svc);
2512                         if (copy_to_user(&uptr->entrytable[count],
2513                                          &entry, sizeof(entry))) {
2514                                 ret = -EFAULT;
2515                                 goto out;
2516                         }
2517                         count++;
2518                 }
2519         }
2520 out:
2521         return ret;
2522 }
2523
2524 static inline int
2525 __ip_vs_get_dest_entries(struct net *net, const struct ip_vs_get_dests *get,
2526                          struct ip_vs_get_dests __user *uptr)
2527 {
2528         struct ip_vs_service *svc;
2529         union nf_inet_addr addr = { .ip = get->addr };
2530         int ret = 0;
2531
2532         rcu_read_lock();
2533         if (get->fwmark)
2534                 svc = __ip_vs_svc_fwm_find(net, AF_INET, get->fwmark);
2535         else
2536                 svc = __ip_vs_service_find(net, AF_INET, get->protocol, &addr,
2537                                            get->port);
2538         rcu_read_unlock();
2539
2540         if (svc) {
2541                 int count = 0;
2542                 struct ip_vs_dest *dest;
2543                 struct ip_vs_dest_entry entry;
2544                 struct ip_vs_kstats kstats;
2545
2546                 memset(&entry, 0, sizeof(entry));
2547                 list_for_each_entry(dest, &svc->destinations, n_list) {
2548                         if (count >= get->num_dests)
2549                                 break;
2550
2551                         /* Cannot expose heterogeneous members via sockopt
2552                          * interface
2553                          */
2554                         if (dest->af != svc->af)
2555                                 continue;
2556
2557                         entry.addr = dest->addr.ip;
2558                         entry.port = dest->port;
2559                         entry.conn_flags = atomic_read(&dest->conn_flags);
2560                         entry.weight = atomic_read(&dest->weight);
2561                         entry.u_threshold = dest->u_threshold;
2562                         entry.l_threshold = dest->l_threshold;
2563                         entry.activeconns = atomic_read(&dest->activeconns);
2564                         entry.inactconns = atomic_read(&dest->inactconns);
2565                         entry.persistconns = atomic_read(&dest->persistconns);
2566                         ip_vs_copy_stats(&kstats, &dest->stats);
2567                         ip_vs_export_stats_user(&entry.stats, &kstats);
2568                         if (copy_to_user(&uptr->entrytable[count],
2569                                          &entry, sizeof(entry))) {
2570                                 ret = -EFAULT;
2571                                 break;
2572                         }
2573                         count++;
2574                 }
2575         } else
2576                 ret = -ESRCH;
2577         return ret;
2578 }
2579
2580 static inline void
2581 __ip_vs_get_timeouts(struct net *net, struct ip_vs_timeout_user *u)
2582 {
2583 #if defined(CONFIG_IP_VS_PROTO_TCP) || defined(CONFIG_IP_VS_PROTO_UDP)
2584         struct ip_vs_proto_data *pd;
2585 #endif
2586
2587         memset(u, 0, sizeof (*u));
2588
2589 #ifdef CONFIG_IP_VS_PROTO_TCP
2590         pd = ip_vs_proto_data_get(net, IPPROTO_TCP);
2591         u->tcp_timeout = pd->timeout_table[IP_VS_TCP_S_ESTABLISHED] / HZ;
2592         u->tcp_fin_timeout = pd->timeout_table[IP_VS_TCP_S_FIN_WAIT] / HZ;
2593 #endif
2594 #ifdef CONFIG_IP_VS_PROTO_UDP
2595         pd = ip_vs_proto_data_get(net, IPPROTO_UDP);
2596         u->udp_timeout =
2597                         pd->timeout_table[IP_VS_UDP_S_NORMAL] / HZ;
2598 #endif
2599 }
2600
2601 static const unsigned char get_arglen[CMDID(IP_VS_SO_GET_MAX) + 1] = {
2602         [CMDID(IP_VS_SO_GET_VERSION)]  = 64,
2603         [CMDID(IP_VS_SO_GET_INFO)]     = sizeof(struct ip_vs_getinfo),
2604         [CMDID(IP_VS_SO_GET_SERVICES)] = sizeof(struct ip_vs_get_services),
2605         [CMDID(IP_VS_SO_GET_SERVICE)]  = sizeof(struct ip_vs_service_entry),
2606         [CMDID(IP_VS_SO_GET_DESTS)]    = sizeof(struct ip_vs_get_dests),
2607         [CMDID(IP_VS_SO_GET_TIMEOUT)]  = sizeof(struct ip_vs_timeout_user),
2608         [CMDID(IP_VS_SO_GET_DAEMON)]   = 2 * sizeof(struct ip_vs_daemon_user),
2609 };
2610
2611 union ip_vs_get_arglen {
2612         char                            field_IP_VS_SO_GET_VERSION[64];
2613         struct ip_vs_getinfo            field_IP_VS_SO_GET_INFO;
2614         struct ip_vs_get_services       field_IP_VS_SO_GET_SERVICES;
2615         struct ip_vs_service_entry      field_IP_VS_SO_GET_SERVICE;
2616         struct ip_vs_get_dests          field_IP_VS_SO_GET_DESTS;
2617         struct ip_vs_timeout_user       field_IP_VS_SO_GET_TIMEOUT;
2618         struct ip_vs_daemon_user        field_IP_VS_SO_GET_DAEMON[2];
2619 };
2620
2621 #define MAX_GET_ARGLEN  sizeof(union ip_vs_get_arglen)
2622
2623 static int
2624 do_ip_vs_get_ctl(struct sock *sk, int cmd, void __user *user, int *len)
2625 {
2626         unsigned char arg[MAX_GET_ARGLEN];
2627         int ret = 0;
2628         unsigned int copylen;
2629         struct net *net = sock_net(sk);
2630         struct netns_ipvs *ipvs = net_ipvs(net);
2631
2632         BUG_ON(!net);
2633         BUILD_BUG_ON(sizeof(arg) > 255);
2634         if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
2635                 return -EPERM;
2636
2637         if (cmd < IP_VS_BASE_CTL || cmd > IP_VS_SO_GET_MAX)
2638                 return -EINVAL;
2639
2640         copylen = get_arglen[CMDID(cmd)];
2641         if (*len < (int) copylen) {
2642                 IP_VS_DBG(1, "get_ctl: len %d < %u\n", *len, copylen);
2643                 return -EINVAL;
2644         }
2645
2646         if (copy_from_user(arg, user, copylen) != 0)
2647                 return -EFAULT;
2648         /*
2649          * Handle daemons first since it has its own locking
2650          */
2651         if (cmd == IP_VS_SO_GET_DAEMON) {
2652                 struct ip_vs_daemon_user d[2];
2653
2654                 memset(&d, 0, sizeof(d));
2655                 mutex_lock(&ipvs->sync_mutex);
2656                 if (ipvs->sync_state & IP_VS_STATE_MASTER) {
2657                         d[0].state = IP_VS_STATE_MASTER;
2658                         strlcpy(d[0].mcast_ifn, ipvs->mcfg.mcast_ifn,
2659                                 sizeof(d[0].mcast_ifn));
2660                         d[0].syncid = ipvs->mcfg.syncid;
2661                 }
2662                 if (ipvs->sync_state & IP_VS_STATE_BACKUP) {
2663                         d[1].state = IP_VS_STATE_BACKUP;
2664                         strlcpy(d[1].mcast_ifn, ipvs->bcfg.mcast_ifn,
2665                                 sizeof(d[1].mcast_ifn));
2666                         d[1].syncid = ipvs->bcfg.syncid;
2667                 }
2668                 if (copy_to_user(user, &d, sizeof(d)) != 0)
2669                         ret = -EFAULT;
2670                 mutex_unlock(&ipvs->sync_mutex);
2671                 return ret;
2672         }
2673
2674         mutex_lock(&__ip_vs_mutex);
2675         switch (cmd) {
2676         case IP_VS_SO_GET_VERSION:
2677         {
2678                 char buf[64];
2679
2680                 sprintf(buf, "IP Virtual Server version %d.%d.%d (size=%d)",
2681                         NVERSION(IP_VS_VERSION_CODE), ip_vs_conn_tab_size);
2682                 if (copy_to_user(user, buf, strlen(buf)+1) != 0) {
2683                         ret = -EFAULT;
2684                         goto out;
2685                 }
2686                 *len = strlen(buf)+1;
2687         }
2688         break;
2689
2690         case IP_VS_SO_GET_INFO:
2691         {
2692                 struct ip_vs_getinfo info;
2693                 info.version = IP_VS_VERSION_CODE;
2694                 info.size = ip_vs_conn_tab_size;
2695                 info.num_services = ipvs->num_services;
2696                 if (copy_to_user(user, &info, sizeof(info)) != 0)
2697                         ret = -EFAULT;
2698         }
2699         break;
2700
2701         case IP_VS_SO_GET_SERVICES:
2702         {
2703                 struct ip_vs_get_services *get;
2704                 int size;
2705
2706                 get = (struct ip_vs_get_services *)arg;
2707                 size = sizeof(*get) +
2708                         sizeof(struct ip_vs_service_entry) * get->num_services;
2709                 if (*len != size) {
2710                         pr_err("length: %u != %u\n", *len, size);
2711                         ret = -EINVAL;
2712                         goto out;
2713                 }
2714                 ret = __ip_vs_get_service_entries(net, get, user);
2715         }
2716         break;
2717
2718         case IP_VS_SO_GET_SERVICE:
2719         {
2720                 struct ip_vs_service_entry *entry;
2721                 struct ip_vs_service *svc;
2722                 union nf_inet_addr addr;
2723
2724                 entry = (struct ip_vs_service_entry *)arg;
2725                 addr.ip = entry->addr;
2726                 rcu_read_lock();
2727                 if (entry->fwmark)
2728                         svc = __ip_vs_svc_fwm_find(net, AF_INET, entry->fwmark);
2729                 else
2730                         svc = __ip_vs_service_find(net, AF_INET,
2731                                                    entry->protocol, &addr,
2732                                                    entry->port);
2733                 rcu_read_unlock();
2734                 if (svc) {
2735                         ip_vs_copy_service(entry, svc);
2736                         if (copy_to_user(user, entry, sizeof(*entry)) != 0)
2737                                 ret = -EFAULT;
2738                 } else
2739                         ret = -ESRCH;
2740         }
2741         break;
2742
2743         case IP_VS_SO_GET_DESTS:
2744         {
2745                 struct ip_vs_get_dests *get;
2746                 int size;
2747
2748                 get = (struct ip_vs_get_dests *)arg;
2749                 size = sizeof(*get) +
2750                         sizeof(struct ip_vs_dest_entry) * get->num_dests;
2751                 if (*len != size) {
2752                         pr_err("length: %u != %u\n", *len, size);
2753                         ret = -EINVAL;
2754                         goto out;
2755                 }
2756                 ret = __ip_vs_get_dest_entries(net, get, user);
2757         }
2758         break;
2759
2760         case IP_VS_SO_GET_TIMEOUT:
2761         {
2762                 struct ip_vs_timeout_user t;
2763
2764                 __ip_vs_get_timeouts(net, &t);
2765                 if (copy_to_user(user, &t, sizeof(t)) != 0)
2766                         ret = -EFAULT;
2767         }
2768         break;
2769
2770         default:
2771                 ret = -EINVAL;
2772         }
2773
2774 out:
2775         mutex_unlock(&__ip_vs_mutex);
2776         return ret;
2777 }
2778
2779
2780 static struct nf_sockopt_ops ip_vs_sockopts = {
2781         .pf             = PF_INET,
2782         .set_optmin     = IP_VS_BASE_CTL,
2783         .set_optmax     = IP_VS_SO_SET_MAX+1,
2784         .set            = do_ip_vs_set_ctl,
2785         .get_optmin     = IP_VS_BASE_CTL,
2786         .get_optmax     = IP_VS_SO_GET_MAX+1,
2787         .get            = do_ip_vs_get_ctl,
2788         .owner          = THIS_MODULE,
2789 };
2790
2791 /*
2792  * Generic Netlink interface
2793  */
2794
2795 /* IPVS genetlink family */
2796 static struct genl_family ip_vs_genl_family = {
2797         .id             = GENL_ID_GENERATE,
2798         .hdrsize        = 0,
2799         .name           = IPVS_GENL_NAME,
2800         .version        = IPVS_GENL_VERSION,
2801         .maxattr        = IPVS_CMD_MAX,
2802         .netnsok        = true,         /* Make ipvsadm to work on netns */
2803 };
2804
2805 /* Policy used for first-level command attributes */
2806 static const struct nla_policy ip_vs_cmd_policy[IPVS_CMD_ATTR_MAX + 1] = {
2807         [IPVS_CMD_ATTR_SERVICE]         = { .type = NLA_NESTED },
2808         [IPVS_CMD_ATTR_DEST]            = { .type = NLA_NESTED },
2809         [IPVS_CMD_ATTR_DAEMON]          = { .type = NLA_NESTED },
2810         [IPVS_CMD_ATTR_TIMEOUT_TCP]     = { .type = NLA_U32 },
2811         [IPVS_CMD_ATTR_TIMEOUT_TCP_FIN] = { .type = NLA_U32 },
2812         [IPVS_CMD_ATTR_TIMEOUT_UDP]     = { .type = NLA_U32 },
2813 };
2814
2815 /* Policy used for attributes in nested attribute IPVS_CMD_ATTR_DAEMON */
2816 static const struct nla_policy ip_vs_daemon_policy[IPVS_DAEMON_ATTR_MAX + 1] = {
2817         [IPVS_DAEMON_ATTR_STATE]        = { .type = NLA_U32 },
2818         [IPVS_DAEMON_ATTR_MCAST_IFN]    = { .type = NLA_NUL_STRING,
2819                                             .len = IP_VS_IFNAME_MAXLEN },
2820         [IPVS_DAEMON_ATTR_SYNC_ID]      = { .type = NLA_U32 },
2821         [IPVS_DAEMON_ATTR_SYNC_MAXLEN]  = { .type = NLA_U16 },
2822         [IPVS_DAEMON_ATTR_MCAST_GROUP]  = { .type = NLA_U32 },
2823         [IPVS_DAEMON_ATTR_MCAST_GROUP6] = { .len = sizeof(struct in6_addr) },
2824         [IPVS_DAEMON_ATTR_MCAST_PORT]   = { .type = NLA_U16 },
2825         [IPVS_DAEMON_ATTR_MCAST_TTL]    = { .type = NLA_U8 },
2826 };
2827
2828 /* Policy used for attributes in nested attribute IPVS_CMD_ATTR_SERVICE */
2829 static const struct nla_policy ip_vs_svc_policy[IPVS_SVC_ATTR_MAX + 1] = {
2830         [IPVS_SVC_ATTR_AF]              = { .type = NLA_U16 },
2831         [IPVS_SVC_ATTR_PROTOCOL]        = { .type = NLA_U16 },
2832         [IPVS_SVC_ATTR_ADDR]            = { .type = NLA_BINARY,
2833                                             .len = sizeof(union nf_inet_addr) },
2834         [IPVS_SVC_ATTR_PORT]            = { .type = NLA_U16 },
2835         [IPVS_SVC_ATTR_FWMARK]          = { .type = NLA_U32 },
2836         [IPVS_SVC_ATTR_SCHED_NAME]      = { .type = NLA_NUL_STRING,
2837                                             .len = IP_VS_SCHEDNAME_MAXLEN },
2838         [IPVS_SVC_ATTR_PE_NAME]         = { .type = NLA_NUL_STRING,
2839                                             .len = IP_VS_PENAME_MAXLEN },
2840         [IPVS_SVC_ATTR_FLAGS]           = { .type = NLA_BINARY,
2841                                             .len = sizeof(struct ip_vs_flags) },
2842         [IPVS_SVC_ATTR_TIMEOUT]         = { .type = NLA_U32 },
2843         [IPVS_SVC_ATTR_NETMASK]         = { .type = NLA_U32 },
2844         [IPVS_SVC_ATTR_STATS]           = { .type = NLA_NESTED },
2845 };
2846
2847 /* Policy used for attributes in nested attribute IPVS_CMD_ATTR_DEST */
2848 static const struct nla_policy ip_vs_dest_policy[IPVS_DEST_ATTR_MAX + 1] = {
2849         [IPVS_DEST_ATTR_ADDR]           = { .type = NLA_BINARY,
2850                                             .len = sizeof(union nf_inet_addr) },
2851         [IPVS_DEST_ATTR_PORT]           = { .type = NLA_U16 },
2852         [IPVS_DEST_ATTR_FWD_METHOD]     = { .type = NLA_U32 },
2853         [IPVS_DEST_ATTR_WEIGHT]         = { .type = NLA_U32 },
2854         [IPVS_DEST_ATTR_U_THRESH]       = { .type = NLA_U32 },
2855         [IPVS_DEST_ATTR_L_THRESH]       = { .type = NLA_U32 },
2856         [IPVS_DEST_ATTR_ACTIVE_CONNS]   = { .type = NLA_U32 },
2857         [IPVS_DEST_ATTR_INACT_CONNS]    = { .type = NLA_U32 },
2858         [IPVS_DEST_ATTR_PERSIST_CONNS]  = { .type = NLA_U32 },
2859         [IPVS_DEST_ATTR_STATS]          = { .type = NLA_NESTED },
2860         [IPVS_DEST_ATTR_ADDR_FAMILY]    = { .type = NLA_U16 },
2861 };
2862
2863 static int ip_vs_genl_fill_stats(struct sk_buff *skb, int container_type,
2864                                  struct ip_vs_kstats *kstats)
2865 {
2866         struct nlattr *nl_stats = nla_nest_start(skb, container_type);
2867
2868         if (!nl_stats)
2869                 return -EMSGSIZE;
2870
2871         if (nla_put_u32(skb, IPVS_STATS_ATTR_CONNS, (u32)kstats->conns) ||
2872             nla_put_u32(skb, IPVS_STATS_ATTR_INPKTS, (u32)kstats->inpkts) ||
2873             nla_put_u32(skb, IPVS_STATS_ATTR_OUTPKTS, (u32)kstats->outpkts) ||
2874             nla_put_u64(skb, IPVS_STATS_ATTR_INBYTES, kstats->inbytes) ||
2875             nla_put_u64(skb, IPVS_STATS_ATTR_OUTBYTES, kstats->outbytes) ||
2876             nla_put_u32(skb, IPVS_STATS_ATTR_CPS, (u32)kstats->cps) ||
2877             nla_put_u32(skb, IPVS_STATS_ATTR_INPPS, (u32)kstats->inpps) ||
2878             nla_put_u32(skb, IPVS_STATS_ATTR_OUTPPS, (u32)kstats->outpps) ||
2879             nla_put_u32(skb, IPVS_STATS_ATTR_INBPS, (u32)kstats->inbps) ||
2880             nla_put_u32(skb, IPVS_STATS_ATTR_OUTBPS, (u32)kstats->outbps))
2881                 goto nla_put_failure;
2882         nla_nest_end(skb, nl_stats);
2883
2884         return 0;
2885
2886 nla_put_failure:
2887         nla_nest_cancel(skb, nl_stats);
2888         return -EMSGSIZE;
2889 }
2890
2891 static int ip_vs_genl_fill_stats64(struct sk_buff *skb, int container_type,
2892                                    struct ip_vs_kstats *kstats)
2893 {
2894         struct nlattr *nl_stats = nla_nest_start(skb, container_type);
2895
2896         if (!nl_stats)
2897                 return -EMSGSIZE;
2898
2899         if (nla_put_u64(skb, IPVS_STATS_ATTR_CONNS, kstats->conns) ||
2900             nla_put_u64(skb, IPVS_STATS_ATTR_INPKTS, kstats->inpkts) ||
2901             nla_put_u64(skb, IPVS_STATS_ATTR_OUTPKTS, kstats->outpkts) ||
2902             nla_put_u64(skb, IPVS_STATS_ATTR_INBYTES, kstats->inbytes) ||
2903             nla_put_u64(skb, IPVS_STATS_ATTR_OUTBYTES, kstats->outbytes) ||
2904             nla_put_u64(skb, IPVS_STATS_ATTR_CPS, kstats->cps) ||
2905             nla_put_u64(skb, IPVS_STATS_ATTR_INPPS, kstats->inpps) ||
2906             nla_put_u64(skb, IPVS_STATS_ATTR_OUTPPS, kstats->outpps) ||
2907             nla_put_u64(skb, IPVS_STATS_ATTR_INBPS, kstats->inbps) ||
2908             nla_put_u64(skb, IPVS_STATS_ATTR_OUTBPS, kstats->outbps))
2909                 goto nla_put_failure;
2910         nla_nest_end(skb, nl_stats);
2911
2912         return 0;
2913
2914 nla_put_failure:
2915         nla_nest_cancel(skb, nl_stats);
2916         return -EMSGSIZE;
2917 }
2918
2919 static int ip_vs_genl_fill_service(struct sk_buff *skb,
2920                                    struct ip_vs_service *svc)
2921 {
2922         struct ip_vs_scheduler *sched;
2923         struct ip_vs_pe *pe;
2924         struct nlattr *nl_service;
2925         struct ip_vs_flags flags = { .flags = svc->flags,
2926                                      .mask = ~0 };
2927         struct ip_vs_kstats kstats;
2928         char *sched_name;
2929
2930         nl_service = nla_nest_start(skb, IPVS_CMD_ATTR_SERVICE);
2931         if (!nl_service)
2932                 return -EMSGSIZE;
2933
2934         if (nla_put_u16(skb, IPVS_SVC_ATTR_AF, svc->af))
2935                 goto nla_put_failure;
2936         if (svc->fwmark) {
2937                 if (nla_put_u32(skb, IPVS_SVC_ATTR_FWMARK, svc->fwmark))
2938                         goto nla_put_failure;
2939         } else {
2940                 if (nla_put_u16(skb, IPVS_SVC_ATTR_PROTOCOL, svc->protocol) ||
2941                     nla_put(skb, IPVS_SVC_ATTR_ADDR, sizeof(svc->addr), &svc->addr) ||
2942                     nla_put_be16(skb, IPVS_SVC_ATTR_PORT, svc->port))
2943                         goto nla_put_failure;
2944         }
2945
2946         sched = rcu_dereference_protected(svc->scheduler, 1);
2947         sched_name = sched ? sched->name : "none";
2948         pe = rcu_dereference_protected(svc->pe, 1);
2949         if (nla_put_string(skb, IPVS_SVC_ATTR_SCHED_NAME, sched_name) ||
2950             (pe && nla_put_string(skb, IPVS_SVC_ATTR_PE_NAME, pe->name)) ||
2951             nla_put(skb, IPVS_SVC_ATTR_FLAGS, sizeof(flags), &flags) ||
2952             nla_put_u32(skb, IPVS_SVC_ATTR_TIMEOUT, svc->timeout / HZ) ||
2953             nla_put_be32(skb, IPVS_SVC_ATTR_NETMASK, svc->netmask))
2954                 goto nla_put_failure;
2955         ip_vs_copy_stats(&kstats, &svc->stats);
2956         if (ip_vs_genl_fill_stats(skb, IPVS_SVC_ATTR_STATS, &kstats))
2957                 goto nla_put_failure;
2958         if (ip_vs_genl_fill_stats64(skb, IPVS_SVC_ATTR_STATS64, &kstats))
2959                 goto nla_put_failure;
2960
2961         nla_nest_end(skb, nl_service);
2962
2963         return 0;
2964
2965 nla_put_failure:
2966         nla_nest_cancel(skb, nl_service);
2967         return -EMSGSIZE;
2968 }
2969
2970 static int ip_vs_genl_dump_service(struct sk_buff *skb,
2971                                    struct ip_vs_service *svc,
2972                                    struct netlink_callback *cb)
2973 {
2974         void *hdr;
2975
2976         hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
2977                           &ip_vs_genl_family, NLM_F_MULTI,
2978                           IPVS_CMD_NEW_SERVICE);
2979         if (!hdr)
2980                 return -EMSGSIZE;
2981
2982         if (ip_vs_genl_fill_service(skb, svc) < 0)
2983                 goto nla_put_failure;
2984
2985         genlmsg_end(skb, hdr);
2986         return 0;
2987
2988 nla_put_failure:
2989         genlmsg_cancel(skb, hdr);
2990         return -EMSGSIZE;
2991 }
2992
2993 static int ip_vs_genl_dump_services(struct sk_buff *skb,
2994                                     struct netlink_callback *cb)
2995 {
2996         int idx = 0, i;
2997         int start = cb->args[0];
2998         struct ip_vs_service *svc;
2999         struct net *net = skb_sknet(skb);
3000
3001         mutex_lock(&__ip_vs_mutex);
3002         for (i = 0; i < IP_VS_SVC_TAB_SIZE; i++) {
3003                 hlist_for_each_entry(svc, &ip_vs_svc_table[i], s_list) {
3004                         if (++idx <= start || !net_eq(svc->net, net))
3005                                 continue;
3006                         if (ip_vs_genl_dump_service(skb, svc, cb) < 0) {
3007                                 idx--;
3008                                 goto nla_put_failure;
3009                         }
3010                 }
3011         }
3012
3013         for (i = 0; i < IP_VS_SVC_TAB_SIZE; i++) {
3014                 hlist_for_each_entry(svc, &ip_vs_svc_fwm_table[i], f_list) {
3015                         if (++idx <= start || !net_eq(svc->net, net))
3016                                 continue;
3017                         if (ip_vs_genl_dump_service(skb, svc, cb) < 0) {
3018                                 idx--;
3019                                 goto nla_put_failure;
3020                         }
3021                 }
3022         }
3023
3024 nla_put_failure:
3025         mutex_unlock(&__ip_vs_mutex);
3026         cb->args[0] = idx;
3027
3028         return skb->len;
3029 }
3030
3031 static int ip_vs_genl_parse_service(struct net *net,
3032                                     struct ip_vs_service_user_kern *usvc,
3033                                     struct nlattr *nla, int full_entry,
3034                                     struct ip_vs_service **ret_svc)
3035 {
3036         struct nlattr *attrs[IPVS_SVC_ATTR_MAX + 1];
3037         struct nlattr *nla_af, *nla_port, *nla_fwmark, *nla_protocol, *nla_addr;
3038         struct ip_vs_service *svc;
3039
3040         /* Parse mandatory identifying service fields first */
3041         if (nla == NULL ||
3042             nla_parse_nested(attrs, IPVS_SVC_ATTR_MAX, nla, ip_vs_svc_policy))
3043                 return -EINVAL;
3044
3045         nla_af          = attrs[IPVS_SVC_ATTR_AF];
3046         nla_protocol    = attrs[IPVS_SVC_ATTR_PROTOCOL];
3047         nla_addr        = attrs[IPVS_SVC_ATTR_ADDR];
3048         nla_port        = attrs[IPVS_SVC_ATTR_PORT];
3049         nla_fwmark      = attrs[IPVS_SVC_ATTR_FWMARK];
3050
3051         if (!(nla_af && (nla_fwmark || (nla_port && nla_protocol && nla_addr))))
3052                 return -EINVAL;
3053
3054         memset(usvc, 0, sizeof(*usvc));
3055
3056         usvc->af = nla_get_u16(nla_af);
3057 #ifdef CONFIG_IP_VS_IPV6
3058         if (usvc->af != AF_INET && usvc->af != AF_INET6)
3059 #else
3060         if (usvc->af != AF_INET)
3061 #endif
3062                 return -EAFNOSUPPORT;
3063
3064         if (nla_fwmark) {
3065                 usvc->protocol = IPPROTO_TCP;
3066                 usvc->fwmark = nla_get_u32(nla_fwmark);
3067         } else {
3068                 usvc->protocol = nla_get_u16(nla_protocol);
3069                 nla_memcpy(&usvc->addr, nla_addr, sizeof(usvc->addr));
3070                 usvc->port = nla_get_be16(nla_port);
3071                 usvc->fwmark = 0;
3072         }
3073
3074         rcu_read_lock();
3075         if (usvc->fwmark)
3076                 svc = __ip_vs_svc_fwm_find(net, usvc->af, usvc->fwmark);
3077         else
3078                 svc = __ip_vs_service_find(net, usvc->af, usvc->protocol,
3079                                            &usvc->addr, usvc->port);
3080         rcu_read_unlock();
3081         *ret_svc = svc;
3082
3083         /* If a full entry was requested, check for the additional fields */
3084         if (full_entry) {
3085                 struct nlattr *nla_sched, *nla_flags, *nla_pe, *nla_timeout,
3086                               *nla_netmask;
3087                 struct ip_vs_flags flags;
3088
3089                 nla_sched = attrs[IPVS_SVC_ATTR_SCHED_NAME];
3090                 nla_pe = attrs[IPVS_SVC_ATTR_PE_NAME];
3091                 nla_flags = attrs[IPVS_SVC_ATTR_FLAGS];
3092                 nla_timeout = attrs[IPVS_SVC_ATTR_TIMEOUT];
3093                 nla_netmask = attrs[IPVS_SVC_ATTR_NETMASK];
3094
3095                 if (!(nla_sched && nla_flags && nla_timeout && nla_netmask))
3096                         return -EINVAL;
3097
3098                 nla_memcpy(&flags, nla_flags, sizeof(flags));
3099
3100                 /* prefill flags from service if it already exists */
3101                 if (svc)
3102                         usvc->flags = svc->flags;
3103
3104                 /* set new flags from userland */
3105                 usvc->flags = (usvc->flags & ~flags.mask) |
3106                               (flags.flags & flags.mask);
3107                 usvc->sched_name = nla_data(nla_sched);
3108                 usvc->pe_name = nla_pe ? nla_data(nla_pe) : NULL;
3109                 usvc->timeout = nla_get_u32(nla_timeout);
3110                 usvc->netmask = nla_get_be32(nla_netmask);
3111         }
3112
3113         return 0;
3114 }
3115
3116 static struct ip_vs_service *ip_vs_genl_find_service(struct net *net,
3117                                                      struct nlattr *nla)
3118 {
3119         struct ip_vs_service_user_kern usvc;
3120         struct ip_vs_service *svc;
3121         int ret;
3122
3123         ret = ip_vs_genl_parse_service(net, &usvc, nla, 0, &svc);
3124         return ret ? ERR_PTR(ret) : svc;
3125 }
3126
3127 static int ip_vs_genl_fill_dest(struct sk_buff *skb, struct ip_vs_dest *dest)
3128 {
3129         struct nlattr *nl_dest;
3130         struct ip_vs_kstats kstats;
3131
3132         nl_dest = nla_nest_start(skb, IPVS_CMD_ATTR_DEST);
3133         if (!nl_dest)
3134                 return -EMSGSIZE;
3135
3136         if (nla_put(skb, IPVS_DEST_ATTR_ADDR, sizeof(dest->addr), &dest->addr) ||
3137             nla_put_be16(skb, IPVS_DEST_ATTR_PORT, dest->port) ||
3138             nla_put_u32(skb, IPVS_DEST_ATTR_FWD_METHOD,
3139                         (atomic_read(&dest->conn_flags) &
3140                          IP_VS_CONN_F_FWD_MASK)) ||
3141             nla_put_u32(skb, IPVS_DEST_ATTR_WEIGHT,
3142                         atomic_read(&dest->weight)) ||
3143             nla_put_u32(skb, IPVS_DEST_ATTR_U_THRESH, dest->u_threshold) ||
3144             nla_put_u32(skb, IPVS_DEST_ATTR_L_THRESH, dest->l_threshold) ||
3145             nla_put_u32(skb, IPVS_DEST_ATTR_ACTIVE_CONNS,
3146                         atomic_read(&dest->activeconns)) ||
3147             nla_put_u32(skb, IPVS_DEST_ATTR_INACT_CONNS,
3148                         atomic_read(&dest->inactconns)) ||
3149             nla_put_u32(skb, IPVS_DEST_ATTR_PERSIST_CONNS,
3150                         atomic_read(&dest->persistconns)) ||
3151             nla_put_u16(skb, IPVS_DEST_ATTR_ADDR_FAMILY, dest->af))
3152                 goto nla_put_failure;
3153         ip_vs_copy_stats(&kstats, &dest->stats);
3154         if (ip_vs_genl_fill_stats(skb, IPVS_DEST_ATTR_STATS, &kstats))
3155                 goto nla_put_failure;
3156         if (ip_vs_genl_fill_stats64(skb, IPVS_DEST_ATTR_STATS64, &kstats))
3157                 goto nla_put_failure;
3158
3159         nla_nest_end(skb, nl_dest);
3160
3161         return 0;
3162
3163 nla_put_failure:
3164         nla_nest_cancel(skb, nl_dest);
3165         return -EMSGSIZE;
3166 }
3167
3168 static int ip_vs_genl_dump_dest(struct sk_buff *skb, struct ip_vs_dest *dest,
3169                                 struct netlink_callback *cb)
3170 {
3171         void *hdr;
3172
3173         hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
3174                           &ip_vs_genl_family, NLM_F_MULTI,
3175                           IPVS_CMD_NEW_DEST);
3176         if (!hdr)
3177                 return -EMSGSIZE;
3178
3179         if (ip_vs_genl_fill_dest(skb, dest) < 0)
3180                 goto nla_put_failure;
3181
3182         genlmsg_end(skb, hdr);
3183         return 0;
3184
3185 nla_put_failure:
3186         genlmsg_cancel(skb, hdr);
3187         return -EMSGSIZE;
3188 }
3189
3190 static int ip_vs_genl_dump_dests(struct sk_buff *skb,
3191                                  struct netlink_callback *cb)
3192 {
3193         int idx = 0;
3194         int start = cb->args[0];
3195         struct ip_vs_service *svc;
3196         struct ip_vs_dest *dest;
3197         struct nlattr *attrs[IPVS_CMD_ATTR_MAX + 1];
3198         struct net *net = skb_sknet(skb);
3199
3200         mutex_lock(&__ip_vs_mutex);
3201
3202         /* Try to find the service for which to dump destinations */
3203         if (nlmsg_parse(cb->nlh, GENL_HDRLEN, attrs,
3204                         IPVS_CMD_ATTR_MAX, ip_vs_cmd_policy))
3205                 goto out_err;
3206
3207
3208         svc = ip_vs_genl_find_service(net, attrs[IPVS_CMD_ATTR_SERVICE]);
3209         if (IS_ERR(svc) || svc == NULL)
3210                 goto out_err;
3211
3212         /* Dump the destinations */
3213         list_for_each_entry(dest, &svc->destinations, n_list) {
3214                 if (++idx <= start)
3215                         continue;
3216                 if (ip_vs_genl_dump_dest(skb, dest, cb) < 0) {
3217                         idx--;
3218                         goto nla_put_failure;
3219                 }
3220         }
3221
3222 nla_put_failure:
3223         cb->args[0] = idx;
3224
3225 out_err:
3226         mutex_unlock(&__ip_vs_mutex);
3227
3228         return skb->len;
3229 }
3230
3231 static int ip_vs_genl_parse_dest(struct ip_vs_dest_user_kern *udest,
3232                                  struct nlattr *nla, int full_entry)
3233 {
3234         struct nlattr *attrs[IPVS_DEST_ATTR_MAX + 1];
3235         struct nlattr *nla_addr, *nla_port;
3236         struct nlattr *nla_addr_family;
3237
3238         /* Parse mandatory identifying destination fields first */
3239         if (nla == NULL ||
3240             nla_parse_nested(attrs, IPVS_DEST_ATTR_MAX, nla, ip_vs_dest_policy))
3241                 return -EINVAL;
3242
3243         nla_addr        = attrs[IPVS_DEST_ATTR_ADDR];
3244         nla_port        = attrs[IPVS_DEST_ATTR_PORT];
3245         nla_addr_family = attrs[IPVS_DEST_ATTR_ADDR_FAMILY];
3246
3247         if (!(nla_addr && nla_port))
3248                 return -EINVAL;
3249
3250         memset(udest, 0, sizeof(*udest));
3251
3252         nla_memcpy(&udest->addr, nla_addr, sizeof(udest->addr));
3253         udest->port = nla_get_be16(nla_port);
3254
3255         if (nla_addr_family)
3256                 udest->af = nla_get_u16(nla_addr_family);
3257         else
3258                 udest->af = 0;
3259
3260         /* If a full entry was requested, check for the additional fields */
3261         if (full_entry) {
3262                 struct nlattr *nla_fwd, *nla_weight, *nla_u_thresh,
3263                               *nla_l_thresh;
3264
3265                 nla_fwd         = attrs[IPVS_DEST_ATTR_FWD_METHOD];
3266                 nla_weight      = attrs[IPVS_DEST_ATTR_WEIGHT];
3267                 nla_u_thresh    = attrs[IPVS_DEST_ATTR_U_THRESH];
3268                 nla_l_thresh    = attrs[IPVS_DEST_ATTR_L_THRESH];
3269
3270                 if (!(nla_fwd && nla_weight && nla_u_thresh && nla_l_thresh))
3271                         return -EINVAL;
3272
3273                 udest->conn_flags = nla_get_u32(nla_fwd)
3274                                     & IP_VS_CONN_F_FWD_MASK;
3275                 udest->weight = nla_get_u32(nla_weight);
3276                 udest->u_threshold = nla_get_u32(nla_u_thresh);
3277                 udest->l_threshold = nla_get_u32(nla_l_thresh);
3278         }
3279
3280         return 0;
3281 }
3282
3283 static int ip_vs_genl_fill_daemon(struct sk_buff *skb, __u32 state,
3284                                   struct ipvs_sync_daemon_cfg *c)
3285 {
3286         struct nlattr *nl_daemon;
3287
3288         nl_daemon = nla_nest_start(skb, IPVS_CMD_ATTR_DAEMON);
3289         if (!nl_daemon)
3290                 return -EMSGSIZE;
3291
3292         if (nla_put_u32(skb, IPVS_DAEMON_ATTR_STATE, state) ||
3293             nla_put_string(skb, IPVS_DAEMON_ATTR_MCAST_IFN, c->mcast_ifn) ||
3294             nla_put_u32(skb, IPVS_DAEMON_ATTR_SYNC_ID, c->syncid) ||
3295             nla_put_u16(skb, IPVS_DAEMON_ATTR_SYNC_MAXLEN, c->sync_maxlen) ||
3296             nla_put_u16(skb, IPVS_DAEMON_ATTR_MCAST_PORT, c->mcast_port) ||
3297             nla_put_u8(skb, IPVS_DAEMON_ATTR_MCAST_TTL, c->mcast_ttl))
3298                 goto nla_put_failure;
3299 #ifdef CONFIG_IP_VS_IPV6
3300         if (c->mcast_af == AF_INET6) {
3301                 if (nla_put_in6_addr(skb, IPVS_DAEMON_ATTR_MCAST_GROUP6,
3302                                      &c->mcast_group.in6))
3303                         goto nla_put_failure;
3304         } else
3305 #endif
3306                 if (c->mcast_af == AF_INET &&
3307                     nla_put_in_addr(skb, IPVS_DAEMON_ATTR_MCAST_GROUP,
3308                                     c->mcast_group.ip))
3309                         goto nla_put_failure;
3310         nla_nest_end(skb, nl_daemon);
3311
3312         return 0;
3313
3314 nla_put_failure:
3315         nla_nest_cancel(skb, nl_daemon);
3316         return -EMSGSIZE;
3317 }
3318
3319 static int ip_vs_genl_dump_daemon(struct sk_buff *skb, __u32 state,
3320                                   struct ipvs_sync_daemon_cfg *c,
3321                                   struct netlink_callback *cb)
3322 {
3323         void *hdr;
3324         hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
3325                           &ip_vs_genl_family, NLM_F_MULTI,
3326                           IPVS_CMD_NEW_DAEMON);
3327         if (!hdr)
3328                 return -EMSGSIZE;
3329
3330         if (ip_vs_genl_fill_daemon(skb, state, c))
3331                 goto nla_put_failure;
3332
3333         genlmsg_end(skb, hdr);
3334         return 0;
3335
3336 nla_put_failure:
3337         genlmsg_cancel(skb, hdr);
3338         return -EMSGSIZE;
3339 }
3340
3341 static int ip_vs_genl_dump_daemons(struct sk_buff *skb,
3342                                    struct netlink_callback *cb)
3343 {
3344         struct net *net = skb_sknet(skb);
3345         struct netns_ipvs *ipvs = net_ipvs(net);
3346
3347         mutex_lock(&ipvs->sync_mutex);
3348         if ((ipvs->sync_state & IP_VS_STATE_MASTER) && !cb->args[0]) {
3349                 if (ip_vs_genl_dump_daemon(skb, IP_VS_STATE_MASTER,
3350                                            &ipvs->mcfg, cb) < 0)
3351                         goto nla_put_failure;
3352
3353                 cb->args[0] = 1;
3354         }
3355
3356         if ((ipvs->sync_state & IP_VS_STATE_BACKUP) && !cb->args[1]) {
3357                 if (ip_vs_genl_dump_daemon(skb, IP_VS_STATE_BACKUP,
3358                                            &ipvs->bcfg, cb) < 0)
3359                         goto nla_put_failure;
3360
3361                 cb->args[1] = 1;
3362         }
3363
3364 nla_put_failure:
3365         mutex_unlock(&ipvs->sync_mutex);
3366
3367         return skb->len;
3368 }
3369
3370 static int ip_vs_genl_new_daemon(struct net *net, struct nlattr **attrs)
3371 {
3372         struct netns_ipvs *ipvs = net_ipvs(net);
3373         struct ipvs_sync_daemon_cfg c;
3374         struct nlattr *a;
3375         int ret;
3376
3377         memset(&c, 0, sizeof(c));
3378         if (!(attrs[IPVS_DAEMON_ATTR_STATE] &&
3379               attrs[IPVS_DAEMON_ATTR_MCAST_IFN] &&
3380               attrs[IPVS_DAEMON_ATTR_SYNC_ID]))
3381                 return -EINVAL;
3382         strlcpy(c.mcast_ifn, nla_data(attrs[IPVS_DAEMON_ATTR_MCAST_IFN]),
3383                 sizeof(c.mcast_ifn));
3384         c.syncid = nla_get_u32(attrs[IPVS_DAEMON_ATTR_SYNC_ID]);
3385
3386         a = attrs[IPVS_DAEMON_ATTR_SYNC_MAXLEN];
3387         if (a)
3388                 c.sync_maxlen = nla_get_u16(a);
3389
3390         a = attrs[IPVS_DAEMON_ATTR_MCAST_GROUP];
3391         if (a) {
3392                 c.mcast_af = AF_INET;
3393                 c.mcast_group.ip = nla_get_in_addr(a);
3394                 if (!ipv4_is_multicast(c.mcast_group.ip))
3395                         return -EINVAL;
3396         } else {
3397                 a = attrs[IPVS_DAEMON_ATTR_MCAST_GROUP6];
3398                 if (a) {
3399 #ifdef CONFIG_IP_VS_IPV6
3400                         int addr_type;
3401
3402                         c.mcast_af = AF_INET6;
3403                         c.mcast_group.in6 = nla_get_in6_addr(a);
3404                         addr_type = ipv6_addr_type(&c.mcast_group.in6);
3405                         if (!(addr_type & IPV6_ADDR_MULTICAST))
3406                                 return -EINVAL;
3407 #else
3408                         return -EAFNOSUPPORT;
3409 #endif
3410                 }
3411         }
3412
3413         a = attrs[IPVS_DAEMON_ATTR_MCAST_PORT];
3414         if (a)
3415                 c.mcast_port = nla_get_u16(a);
3416
3417         a = attrs[IPVS_DAEMON_ATTR_MCAST_TTL];
3418         if (a)
3419                 c.mcast_ttl = nla_get_u8(a);
3420
3421         /* The synchronization protocol is incompatible with mixed family
3422          * services
3423          */
3424         if (ipvs->mixed_address_family_dests > 0)
3425                 return -EINVAL;
3426
3427         rtnl_lock();
3428         mutex_lock(&ipvs->sync_mutex);
3429         ret = start_sync_thread(net, &c,
3430                                 nla_get_u32(attrs[IPVS_DAEMON_ATTR_STATE]));
3431         mutex_unlock(&ipvs->sync_mutex);
3432         rtnl_unlock();
3433         return ret;
3434 }
3435
3436 static int ip_vs_genl_del_daemon(struct net *net, struct nlattr **attrs)
3437 {
3438         struct netns_ipvs *ipvs = net_ipvs(net);
3439         int ret;
3440
3441         if (!attrs[IPVS_DAEMON_ATTR_STATE])
3442                 return -EINVAL;
3443
3444         mutex_lock(&ipvs->sync_mutex);
3445         ret = stop_sync_thread(net,
3446                                nla_get_u32(attrs[IPVS_DAEMON_ATTR_STATE]));
3447         mutex_unlock(&ipvs->sync_mutex);
3448         return ret;
3449 }
3450
3451 static int ip_vs_genl_set_config(struct net *net, struct nlattr **attrs)
3452 {
3453         struct ip_vs_timeout_user t;
3454
3455         __ip_vs_get_timeouts(net, &t);
3456
3457         if (attrs[IPVS_CMD_ATTR_TIMEOUT_TCP])
3458                 t.tcp_timeout = nla_get_u32(attrs[IPVS_CMD_ATTR_TIMEOUT_TCP]);
3459
3460         if (attrs[IPVS_CMD_ATTR_TIMEOUT_TCP_FIN])
3461                 t.tcp_fin_timeout =
3462                         nla_get_u32(attrs[IPVS_CMD_ATTR_TIMEOUT_TCP_FIN]);
3463
3464         if (attrs[IPVS_CMD_ATTR_TIMEOUT_UDP])
3465                 t.udp_timeout = nla_get_u32(attrs[IPVS_CMD_ATTR_TIMEOUT_UDP]);
3466
3467         return ip_vs_set_timeout(net, &t);
3468 }
3469
3470 static int ip_vs_genl_set_daemon(struct sk_buff *skb, struct genl_info *info)
3471 {
3472         int ret = -EINVAL, cmd;
3473         struct net *net;
3474         struct netns_ipvs *ipvs;
3475
3476         net = skb_sknet(skb);
3477         ipvs = net_ipvs(net);
3478         cmd = info->genlhdr->cmd;
3479
3480         if (cmd == IPVS_CMD_NEW_DAEMON || cmd == IPVS_CMD_DEL_DAEMON) {
3481                 struct nlattr *daemon_attrs[IPVS_DAEMON_ATTR_MAX + 1];
3482
3483                 if (!info->attrs[IPVS_CMD_ATTR_DAEMON] ||
3484                     nla_parse_nested(daemon_attrs, IPVS_DAEMON_ATTR_MAX,
3485                                      info->attrs[IPVS_CMD_ATTR_DAEMON],
3486                                      ip_vs_daemon_policy))
3487                         goto out;
3488
3489                 if (cmd == IPVS_CMD_NEW_DAEMON)
3490                         ret = ip_vs_genl_new_daemon(net, daemon_attrs);
3491                 else
3492                         ret = ip_vs_genl_del_daemon(net, daemon_attrs);
3493         }
3494
3495 out:
3496         return ret;
3497 }
3498
3499 static int ip_vs_genl_set_cmd(struct sk_buff *skb, struct genl_info *info)
3500 {
3501         struct ip_vs_service *svc = NULL;
3502         struct ip_vs_service_user_kern usvc;
3503         struct ip_vs_dest_user_kern udest;
3504         int ret = 0, cmd;
3505         int need_full_svc = 0, need_full_dest = 0;
3506         struct net *net;
3507
3508         net = skb_sknet(skb);
3509         cmd = info->genlhdr->cmd;
3510
3511         mutex_lock(&__ip_vs_mutex);
3512
3513         if (cmd == IPVS_CMD_FLUSH) {
3514                 ret = ip_vs_flush(net, false);
3515                 goto out;
3516         } else if (cmd == IPVS_CMD_SET_CONFIG) {
3517                 ret = ip_vs_genl_set_config(net, info->attrs);
3518                 goto out;
3519         } else if (cmd == IPVS_CMD_ZERO &&
3520                    !info->attrs[IPVS_CMD_ATTR_SERVICE]) {
3521                 ret = ip_vs_zero_all(net);
3522                 goto out;
3523         }
3524
3525         /* All following commands require a service argument, so check if we
3526          * received a valid one. We need a full service specification when
3527          * adding / editing a service. Only identifying members otherwise. */
3528         if (cmd == IPVS_CMD_NEW_SERVICE || cmd == IPVS_CMD_SET_SERVICE)
3529                 need_full_svc = 1;
3530
3531         ret = ip_vs_genl_parse_service(net, &usvc,
3532                                        info->attrs[IPVS_CMD_ATTR_SERVICE],
3533                                        need_full_svc, &svc);
3534         if (ret)
3535                 goto out;
3536
3537         /* Unless we're adding a new service, the service must already exist */
3538         if ((cmd != IPVS_CMD_NEW_SERVICE) && (svc == NULL)) {
3539                 ret = -ESRCH;
3540                 goto out;
3541         }
3542
3543         /* Destination commands require a valid destination argument. For
3544          * adding / editing a destination, we need a full destination
3545          * specification. */
3546         if (cmd == IPVS_CMD_NEW_DEST || cmd == IPVS_CMD_SET_DEST ||
3547             cmd == IPVS_CMD_DEL_DEST) {
3548                 if (cmd != IPVS_CMD_DEL_DEST)
3549                         need_full_dest = 1;
3550
3551                 ret = ip_vs_genl_parse_dest(&udest,
3552                                             info->attrs[IPVS_CMD_ATTR_DEST],
3553                                             need_full_dest);
3554                 if (ret)
3555                         goto out;
3556
3557                 /* Old protocols did not allow the user to specify address
3558                  * family, so we set it to zero instead.  We also didn't
3559                  * allow heterogeneous pools in the old code, so it's safe
3560                  * to assume that this will have the same address family as
3561                  * the service.
3562                  */
3563                 if (udest.af == 0)
3564                         udest.af = svc->af;
3565
3566                 if (udest.af != svc->af && cmd != IPVS_CMD_DEL_DEST) {
3567                         /* The synchronization protocol is incompatible
3568                          * with mixed family services
3569                          */
3570                         if (net_ipvs(net)->sync_state) {
3571                                 ret = -EINVAL;
3572                                 goto out;
3573                         }
3574
3575                         /* Which connection types do we support? */
3576                         switch (udest.conn_flags) {
3577                         case IP_VS_CONN_F_TUNNEL:
3578                                 /* We are able to forward this */
3579                                 break;
3580                         default:
3581                                 ret = -EINVAL;
3582                                 goto out;
3583                         }
3584                 }
3585         }
3586
3587         switch (cmd) {
3588         case IPVS_CMD_NEW_SERVICE:
3589                 if (svc == NULL)
3590                         ret = ip_vs_add_service(net, &usvc, &svc);
3591                 else
3592                         ret = -EEXIST;
3593                 break;
3594         case IPVS_CMD_SET_SERVICE:
3595                 ret = ip_vs_edit_service(svc, &usvc);
3596                 break;
3597         case IPVS_CMD_DEL_SERVICE:
3598                 ret = ip_vs_del_service(svc);
3599                 /* do not use svc, it can be freed */
3600                 break;
3601         case IPVS_CMD_NEW_DEST:
3602                 ret = ip_vs_add_dest(svc, &udest);
3603                 break;
3604         case IPVS_CMD_SET_DEST:
3605                 ret = ip_vs_edit_dest(svc, &udest);
3606                 break;
3607         case IPVS_CMD_DEL_DEST:
3608                 ret = ip_vs_del_dest(svc, &udest);
3609                 break;
3610         case IPVS_CMD_ZERO:
3611                 ret = ip_vs_zero_service(svc);
3612                 break;
3613         default:
3614                 ret = -EINVAL;
3615         }
3616
3617 out:
3618         mutex_unlock(&__ip_vs_mutex);
3619
3620         return ret;
3621 }
3622
3623 static int ip_vs_genl_get_cmd(struct sk_buff *skb, struct genl_info *info)
3624 {
3625         struct sk_buff *msg;
3626         void *reply;
3627         int ret, cmd, reply_cmd;
3628         struct net *net;
3629
3630         net = skb_sknet(skb);
3631         cmd = info->genlhdr->cmd;
3632
3633         if (cmd == IPVS_CMD_GET_SERVICE)
3634                 reply_cmd = IPVS_CMD_NEW_SERVICE;
3635         else if (cmd == IPVS_CMD_GET_INFO)
3636                 reply_cmd = IPVS_CMD_SET_INFO;
3637         else if (cmd == IPVS_CMD_GET_CONFIG)
3638                 reply_cmd = IPVS_CMD_SET_CONFIG;
3639         else {
3640                 pr_err("unknown Generic Netlink command\n");
3641                 return -EINVAL;
3642         }
3643
3644         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
3645         if (!msg)
3646                 return -ENOMEM;
3647
3648         mutex_lock(&__ip_vs_mutex);
3649
3650         reply = genlmsg_put_reply(msg, info, &ip_vs_genl_family, 0, reply_cmd);
3651         if (reply == NULL)
3652                 goto nla_put_failure;
3653
3654         switch (cmd) {
3655         case IPVS_CMD_GET_SERVICE:
3656         {
3657                 struct ip_vs_service *svc;
3658
3659                 svc = ip_vs_genl_find_service(net,
3660                                               info->attrs[IPVS_CMD_ATTR_SERVICE]);
3661                 if (IS_ERR(svc)) {
3662                         ret = PTR_ERR(svc);
3663                         goto out_err;
3664                 } else if (svc) {
3665                         ret = ip_vs_genl_fill_service(msg, svc);
3666                         if (ret)
3667                                 goto nla_put_failure;
3668                 } else {
3669                         ret = -ESRCH;
3670                         goto out_err;
3671                 }
3672
3673                 break;
3674         }
3675
3676         case IPVS_CMD_GET_CONFIG:
3677         {
3678                 struct ip_vs_timeout_user t;
3679
3680                 __ip_vs_get_timeouts(net, &t);
3681 #ifdef CONFIG_IP_VS_PROTO_TCP
3682                 if (nla_put_u32(msg, IPVS_CMD_ATTR_TIMEOUT_TCP,
3683                                 t.tcp_timeout) ||
3684                     nla_put_u32(msg, IPVS_CMD_ATTR_TIMEOUT_TCP_FIN,
3685                                 t.tcp_fin_timeout))
3686                         goto nla_put_failure;
3687 #endif
3688 #ifdef CONFIG_IP_VS_PROTO_UDP
3689                 if (nla_put_u32(msg, IPVS_CMD_ATTR_TIMEOUT_UDP, t.udp_timeout))
3690                         goto nla_put_failure;
3691 #endif
3692
3693                 break;
3694         }
3695
3696         case IPVS_CMD_GET_INFO:
3697                 if (nla_put_u32(msg, IPVS_INFO_ATTR_VERSION,
3698                                 IP_VS_VERSION_CODE) ||
3699                     nla_put_u32(msg, IPVS_INFO_ATTR_CONN_TAB_SIZE,
3700                                 ip_vs_conn_tab_size))
3701                         goto nla_put_failure;
3702                 break;
3703         }
3704
3705         genlmsg_end(msg, reply);
3706         ret = genlmsg_reply(msg, info);
3707         goto out;
3708
3709 nla_put_failure:
3710         pr_err("not enough space in Netlink message\n");
3711         ret = -EMSGSIZE;
3712
3713 out_err:
3714         nlmsg_free(msg);
3715 out:
3716         mutex_unlock(&__ip_vs_mutex);
3717
3718         return ret;
3719 }
3720
3721
3722 static const struct genl_ops ip_vs_genl_ops[] = {
3723         {
3724                 .cmd    = IPVS_CMD_NEW_SERVICE,
3725                 .flags  = GENL_ADMIN_PERM,
3726                 .policy = ip_vs_cmd_policy,
3727                 .doit   = ip_vs_genl_set_cmd,
3728         },
3729         {
3730                 .cmd    = IPVS_CMD_SET_SERVICE,
3731                 .flags  = GENL_ADMIN_PERM,
3732                 .policy = ip_vs_cmd_policy,
3733                 .doit   = ip_vs_genl_set_cmd,
3734         },
3735         {
3736                 .cmd    = IPVS_CMD_DEL_SERVICE,
3737                 .flags  = GENL_ADMIN_PERM,
3738                 .policy = ip_vs_cmd_policy,
3739                 .doit   = ip_vs_genl_set_cmd,
3740         },
3741         {
3742                 .cmd    = IPVS_CMD_GET_SERVICE,
3743                 .flags  = GENL_ADMIN_PERM,
3744                 .doit   = ip_vs_genl_get_cmd,
3745                 .dumpit = ip_vs_genl_dump_services,
3746                 .policy = ip_vs_cmd_policy,
3747         },
3748         {
3749                 .cmd    = IPVS_CMD_NEW_DEST,
3750                 .flags  = GENL_ADMIN_PERM,
3751                 .policy = ip_vs_cmd_policy,
3752                 .doit   = ip_vs_genl_set_cmd,
3753         },
3754         {
3755                 .cmd    = IPVS_CMD_SET_DEST,
3756                 .flags  = GENL_ADMIN_PERM,
3757                 .policy = ip_vs_cmd_policy,
3758                 .doit   = ip_vs_genl_set_cmd,
3759         },
3760         {
3761                 .cmd    = IPVS_CMD_DEL_DEST,
3762                 .flags  = GENL_ADMIN_PERM,
3763                 .policy = ip_vs_cmd_policy,
3764                 .doit   = ip_vs_genl_set_cmd,
3765         },
3766         {
3767                 .cmd    = IPVS_CMD_GET_DEST,
3768                 .flags  = GENL_ADMIN_PERM,
3769                 .policy = ip_vs_cmd_policy,
3770                 .dumpit = ip_vs_genl_dump_dests,
3771         },
3772         {
3773                 .cmd    = IPVS_CMD_NEW_DAEMON,
3774                 .flags  = GENL_ADMIN_PERM,
3775                 .policy = ip_vs_cmd_policy,
3776                 .doit   = ip_vs_genl_set_daemon,
3777         },
3778         {
3779                 .cmd    = IPVS_CMD_DEL_DAEMON,
3780                 .flags  = GENL_ADMIN_PERM,
3781                 .policy = ip_vs_cmd_policy,
3782                 .doit   = ip_vs_genl_set_daemon,
3783         },
3784         {
3785                 .cmd    = IPVS_CMD_GET_DAEMON,
3786                 .flags  = GENL_ADMIN_PERM,
3787                 .dumpit = ip_vs_genl_dump_daemons,
3788         },
3789         {
3790                 .cmd    = IPVS_CMD_SET_CONFIG,
3791                 .flags  = GENL_ADMIN_PERM,
3792                 .policy = ip_vs_cmd_policy,
3793                 .doit   = ip_vs_genl_set_cmd,
3794         },
3795         {
3796                 .cmd    = IPVS_CMD_GET_CONFIG,
3797                 .flags  = GENL_ADMIN_PERM,
3798                 .doit   = ip_vs_genl_get_cmd,
3799         },
3800         {
3801                 .cmd    = IPVS_CMD_GET_INFO,
3802                 .flags  = GENL_ADMIN_PERM,
3803                 .doit   = ip_vs_genl_get_cmd,
3804         },
3805         {
3806                 .cmd    = IPVS_CMD_ZERO,
3807                 .flags  = GENL_ADMIN_PERM,
3808                 .policy = ip_vs_cmd_policy,
3809                 .doit   = ip_vs_genl_set_cmd,
3810         },
3811         {
3812                 .cmd    = IPVS_CMD_FLUSH,
3813                 .flags  = GENL_ADMIN_PERM,
3814                 .doit   = ip_vs_genl_set_cmd,
3815         },
3816 };
3817
3818 static int __init ip_vs_genl_register(void)
3819 {
3820         return genl_register_family_with_ops(&ip_vs_genl_family,
3821                                              ip_vs_genl_ops);
3822 }
3823
3824 static void ip_vs_genl_unregister(void)
3825 {
3826         genl_unregister_family(&ip_vs_genl_family);
3827 }
3828
3829 /* End of Generic Netlink interface definitions */
3830
3831 /*
3832  * per netns intit/exit func.
3833  */
3834 #ifdef CONFIG_SYSCTL
3835 static int __net_init ip_vs_control_net_init_sysctl(struct net *net)
3836 {
3837         int idx;
3838         struct netns_ipvs *ipvs = net_ipvs(net);
3839         struct ctl_table *tbl;
3840
3841         atomic_set(&ipvs->dropentry, 0);
3842         spin_lock_init(&ipvs->dropentry_lock);
3843         spin_lock_init(&ipvs->droppacket_lock);
3844         spin_lock_init(&ipvs->securetcp_lock);
3845
3846         if (!net_eq(net, &init_net)) {
3847                 tbl = kmemdup(vs_vars, sizeof(vs_vars), GFP_KERNEL);
3848                 if (tbl == NULL)
3849                         return -ENOMEM;
3850
3851                 /* Don't export sysctls to unprivileged users */
3852                 if (net->user_ns != &init_user_ns)
3853                         tbl[0].procname = NULL;
3854         } else
3855                 tbl = vs_vars;
3856         /* Initialize sysctl defaults */
3857         idx = 0;
3858         ipvs->sysctl_amemthresh = 1024;
3859         tbl[idx++].data = &ipvs->sysctl_amemthresh;
3860         ipvs->sysctl_am_droprate = 10;
3861         tbl[idx++].data = &ipvs->sysctl_am_droprate;
3862         tbl[idx++].data = &ipvs->sysctl_drop_entry;
3863         tbl[idx++].data = &ipvs->sysctl_drop_packet;
3864 #ifdef CONFIG_IP_VS_NFCT
3865         tbl[idx++].data = &ipvs->sysctl_conntrack;
3866 #endif
3867         tbl[idx++].data = &ipvs->sysctl_secure_tcp;
3868         ipvs->sysctl_snat_reroute = 1;
3869         tbl[idx++].data = &ipvs->sysctl_snat_reroute;
3870         ipvs->sysctl_sync_ver = 1;
3871         tbl[idx++].data = &ipvs->sysctl_sync_ver;
3872         ipvs->sysctl_sync_ports = 1;
3873         tbl[idx++].data = &ipvs->sysctl_sync_ports;
3874         tbl[idx++].data = &ipvs->sysctl_sync_persist_mode;
3875         ipvs->sysctl_sync_qlen_max = nr_free_buffer_pages() / 32;
3876         tbl[idx++].data = &ipvs->sysctl_sync_qlen_max;
3877         ipvs->sysctl_sync_sock_size = 0;
3878         tbl[idx++].data = &ipvs->sysctl_sync_sock_size;
3879         tbl[idx++].data = &ipvs->sysctl_cache_bypass;
3880         tbl[idx++].data = &ipvs->sysctl_expire_nodest_conn;
3881         tbl[idx++].data = &ipvs->sysctl_sloppy_tcp;
3882         tbl[idx++].data = &ipvs->sysctl_sloppy_sctp;
3883         tbl[idx++].data = &ipvs->sysctl_expire_quiescent_template;
3884         ipvs->sysctl_sync_threshold[0] = DEFAULT_SYNC_THRESHOLD;
3885         ipvs->sysctl_sync_threshold[1] = DEFAULT_SYNC_PERIOD;
3886         tbl[idx].data = &ipvs->sysctl_sync_threshold;
3887         tbl[idx++].maxlen = sizeof(ipvs->sysctl_sync_threshold);
3888         ipvs->sysctl_sync_refresh_period = DEFAULT_SYNC_REFRESH_PERIOD;
3889         tbl[idx++].data = &ipvs->sysctl_sync_refresh_period;
3890         ipvs->sysctl_sync_retries = clamp_t(int, DEFAULT_SYNC_RETRIES, 0, 3);
3891         tbl[idx++].data = &ipvs->sysctl_sync_retries;
3892         tbl[idx++].data = &ipvs->sysctl_nat_icmp_send;
3893         ipvs->sysctl_pmtu_disc = 1;
3894         tbl[idx++].data = &ipvs->sysctl_pmtu_disc;
3895         tbl[idx++].data = &ipvs->sysctl_backup_only;
3896         ipvs->sysctl_conn_reuse_mode = 1;
3897         tbl[idx++].data = &ipvs->sysctl_conn_reuse_mode;
3898
3899
3900         ipvs->sysctl_hdr = register_net_sysctl(net, "net/ipv4/vs", tbl);
3901         if (ipvs->sysctl_hdr == NULL) {
3902                 if (!net_eq(net, &init_net))
3903                         kfree(tbl);
3904                 return -ENOMEM;
3905         }
3906         ip_vs_start_estimator(net, &ipvs->tot_stats);
3907         ipvs->sysctl_tbl = tbl;
3908         /* Schedule defense work */
3909         INIT_DELAYED_WORK(&ipvs->defense_work, defense_work_handler);
3910         schedule_delayed_work(&ipvs->defense_work, DEFENSE_TIMER_PERIOD);
3911
3912         return 0;
3913 }
3914
3915 static void __net_exit ip_vs_control_net_cleanup_sysctl(struct net *net)
3916 {
3917         struct netns_ipvs *ipvs = net_ipvs(net);
3918
3919         cancel_delayed_work_sync(&ipvs->defense_work);
3920         cancel_work_sync(&ipvs->defense_work.work);
3921         unregister_net_sysctl_table(ipvs->sysctl_hdr);
3922         ip_vs_stop_estimator(net, &ipvs->tot_stats);
3923
3924         if (!net_eq(net, &init_net))
3925                 kfree(ipvs->sysctl_tbl);
3926 }
3927
3928 #else
3929
3930 static int __net_init ip_vs_control_net_init_sysctl(struct net *net) { return 0; }
3931 static void __net_exit ip_vs_control_net_cleanup_sysctl(struct net *net) { }
3932
3933 #endif
3934
3935 static struct notifier_block ip_vs_dst_notifier = {
3936         .notifier_call = ip_vs_dst_event,
3937 };
3938
3939 int __net_init ip_vs_control_net_init(struct net *net)
3940 {
3941         int i, idx;
3942         struct netns_ipvs *ipvs = net_ipvs(net);
3943
3944         /* Initialize rs_table */
3945         for (idx = 0; idx < IP_VS_RTAB_SIZE; idx++)
3946                 INIT_HLIST_HEAD(&ipvs->rs_table[idx]);
3947
3948         INIT_LIST_HEAD(&ipvs->dest_trash);
3949         spin_lock_init(&ipvs->dest_trash_lock);
3950         setup_timer(&ipvs->dest_trash_timer, ip_vs_dest_trash_expire,
3951                     (unsigned long) net);
3952         atomic_set(&ipvs->ftpsvc_counter, 0);
3953         atomic_set(&ipvs->nullsvc_counter, 0);
3954
3955         /* procfs stats */
3956         ipvs->tot_stats.cpustats = alloc_percpu(struct ip_vs_cpu_stats);
3957         if (!ipvs->tot_stats.cpustats)
3958                 return -ENOMEM;
3959
3960         for_each_possible_cpu(i) {
3961                 struct ip_vs_cpu_stats *ipvs_tot_stats;
3962                 ipvs_tot_stats = per_cpu_ptr(ipvs->tot_stats.cpustats, i);
3963                 u64_stats_init(&ipvs_tot_stats->syncp);
3964         }
3965
3966         spin_lock_init(&ipvs->tot_stats.lock);
3967
3968         proc_create("ip_vs", 0, net->proc_net, &ip_vs_info_fops);
3969         proc_create("ip_vs_stats", 0, net->proc_net, &ip_vs_stats_fops);
3970         proc_create("ip_vs_stats_percpu", 0, net->proc_net,
3971                     &ip_vs_stats_percpu_fops);
3972
3973         if (ip_vs_control_net_init_sysctl(net))
3974                 goto err;
3975
3976         return 0;
3977
3978 err:
3979         free_percpu(ipvs->tot_stats.cpustats);
3980         return -ENOMEM;
3981 }
3982
3983 void __net_exit ip_vs_control_net_cleanup(struct net *net)
3984 {
3985         struct netns_ipvs *ipvs = net_ipvs(net);
3986
3987         ip_vs_trash_cleanup(net);
3988         ip_vs_control_net_cleanup_sysctl(net);
3989         remove_proc_entry("ip_vs_stats_percpu", net->proc_net);
3990         remove_proc_entry("ip_vs_stats", net->proc_net);
3991         remove_proc_entry("ip_vs", net->proc_net);
3992         free_percpu(ipvs->tot_stats.cpustats);
3993 }
3994
3995 int __init ip_vs_register_nl_ioctl(void)
3996 {
3997         int ret;
3998
3999         ret = nf_register_sockopt(&ip_vs_sockopts);
4000         if (ret) {
4001                 pr_err("cannot register sockopt.\n");
4002                 goto err_sock;
4003         }
4004
4005         ret = ip_vs_genl_register();
4006         if (ret) {
4007                 pr_err("cannot register Generic Netlink interface.\n");
4008                 goto err_genl;
4009         }
4010         return 0;
4011
4012 err_genl:
4013         nf_unregister_sockopt(&ip_vs_sockopts);
4014 err_sock:
4015         return ret;
4016 }
4017
4018 void ip_vs_unregister_nl_ioctl(void)
4019 {
4020         ip_vs_genl_unregister();
4021         nf_unregister_sockopt(&ip_vs_sockopts);
4022 }
4023
4024 int __init ip_vs_control_init(void)
4025 {
4026         int idx;
4027         int ret;
4028
4029         EnterFunction(2);
4030
4031         /* Initialize svc_table, ip_vs_svc_fwm_table */
4032         for (idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
4033                 INIT_HLIST_HEAD(&ip_vs_svc_table[idx]);
4034                 INIT_HLIST_HEAD(&ip_vs_svc_fwm_table[idx]);
4035         }
4036
4037         smp_wmb();      /* Do we really need it now ? */
4038
4039         ret = register_netdevice_notifier(&ip_vs_dst_notifier);
4040         if (ret < 0)
4041                 return ret;
4042
4043         LeaveFunction(2);
4044         return 0;
4045 }
4046
4047
4048 void ip_vs_control_cleanup(void)
4049 {
4050         EnterFunction(2);
4051         unregister_netdevice_notifier(&ip_vs_dst_notifier);
4052         LeaveFunction(2);
4053 }