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