net/netfilter/ipvs/ip_vs_ctl.c

   1 /*
   2  * IPVS         An implementation of the IP virtual server support for the
   3  *              LINUX operating system.  IPVS is now implemented as a module
   4  *              over the NetFilter framework. IPVS can be used to build a
   5  *              high-performance and highly available server based on a
   6  *              cluster of servers.
   7  *
   8  * Authors:     Wensong Zhang <wensong@linuxvirtualserver.org>
   9  *              Peter Kese <peter.kese@ijs.si>
  10  *              Julian Anastasov <ja@ssi.bg>
  11  *
  12  *              This program is free software; you can redistribute it and/or
  13  *              modify it under the terms of the GNU General Public License
  14  *              as published by the Free Software Foundation; either version
  15  *              2 of the License, or (at your option) any later version.
  16  *
  17  * Changes:
  18  *
  19  */
  20
  21 #define KMSG_COMPONENT "IPVS"
  22 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  23
  24 #include <linux/module.h>
  25 #include <linux/init.h>
  26 #include <linux/types.h>
  27 #include <linux/capability.h>
  28 #include <linux/fs.h>
  29 #include <linux/sysctl.h>
  30 #include <linux/proc_fs.h>
  31 #include <linux/workqueue.h>
  32 #include <linux/swap.h>
  33 #include <linux/seq_file.h>
  34 #include <linux/slab.h>
  35
  36 #include <linux/netfilter.h>
  37 #include <linux/netfilter_ipv4.h>
  38 #include <linux/mutex.h>
  39
  40 #include <net/net_namespace.h>
  41 #include <linux/nsproxy.h>
  42 #include <net/ip.h>
  43 #ifdef CONFIG_IP_VS_IPV6
  44 #include <net/ipv6.h>
  45 #include <net/ip6_route.h>
  46 #endif
  47 #include <net/route.h>
  48 #include <net/sock.h>
  49 #include <net/genetlink.h>
  50
  51 #include <asm/uaccess.h>
  52
  53 #include <net/ip_vs.h>
  54
  55 /* semaphore for IPVS sockopts. And, [gs]etsockopt may sleep. */
  56 static DEFINE_MUTEX(__ip_vs_mutex);
  57
  58 /* lock for service table */
  59 static DEFINE_RWLOCK(__ip_vs_svc_lock);
  60
  61 /* sysctl variables */
  62
  63 #ifdef CONFIG_IP_VS_DEBUG
  64 static int sysctl_ip_vs_debug_level = 0;
  65
  66 int ip_vs_get_debug_level(void)
  67 {
  68         return sysctl_ip_vs_debug_level;
  69 }
  70 #endif
  71
  72
  73 /*  Protos */
  74 static void __ip_vs_del_service(struct ip_vs_service *svc, bool cleanup);
  75
  76
  77 #ifdef CONFIG_IP_VS_IPV6
  78 /* Taken from rt6_fill_node() in net/ipv6/route.c, is there a better way? */
  79 static bool __ip_vs_addr_is_local_v6(struct net *net,
  80                                      const struct in6_addr *addr)
  81 {
  82         struct flowi6 fl6 = {
  83                 .daddr = *addr,
  84         };
  85         struct dst_entry *dst = ip6_route_output(net, NULL, &fl6);
  86         bool is_local;
  87
  88         is_local = !dst->error && dst->dev && (dst->dev->flags & IFF_LOOPBACK);
  89
  90         dst_release(dst);
  91         return is_local;
  92 }
  93 #endif
  94
  95 #ifdef CONFIG_SYSCTL
  96 /*
  97  *      update_defense_level is called from keventd and from sysctl,
  98  *      so it needs to protect itself from softirqs
  99  */
 100 static void update_defense_level(struct netns_ipvs *ipvs)
 101 {
 102         struct sysinfo i;
 103         static int old_secure_tcp = 0;
 104         int availmem;
 105         int nomem;
 106         int to_change = -1;
 107
 108         /* we only count free and buffered memory (in pages) */
 109         si_meminfo(&i);
 110         availmem = i.freeram + i.bufferram;
 111         /* however in linux 2.5 the i.bufferram is total page cache size,
 112            we need adjust it */
 113         /* si_swapinfo(&i); */
 114         /* availmem = availmem - (i.totalswap - i.freeswap); */
 115
 116         nomem = (availmem < ipvs->sysctl_amemthresh);
 117
 118         local_bh_disable();
 119
 120         /* drop_entry */
 121         spin_lock(&ipvs->dropentry_lock);
 122         switch (ipvs->sysctl_drop_entry) {
 123         case 0:
 124                 atomic_set(&ipvs->dropentry, 0);
 125                 break;
 126         case 1:
 127                 if (nomem) {
 128                         atomic_set(&ipvs->dropentry, 1);
 129                         ipvs->sysctl_drop_entry = 2;
 130                 } else {
 131                         atomic_set(&ipvs->dropentry, 0);
 132                 }
 133                 break;
 134         case 2:
 135                 if (nomem) {
 136                         atomic_set(&ipvs->dropentry, 1);
 137                 } else {
 138                         atomic_set(&ipvs->dropentry, 0);
 139                         ipvs->sysctl_drop_entry = 1;
 140                 };
 141                 break;
 142         case 3:
 143                 atomic_set(&ipvs->dropentry, 1);
 144                 break;
 145         }
 146         spin_unlock(&ipvs->dropentry_lock);
 147
 148         /* drop_packet */
 149         spin_lock(&ipvs->droppacket_lock);
 150         switch (ipvs->sysctl_drop_packet) {
 151         case 0:
 152                 ipvs->drop_rate = 0;
 153                 break;
 154         case 1:
 155                 if (nomem) {
 156                         ipvs->drop_rate = ipvs->drop_counter
 157                                 = ipvs->sysctl_amemthresh /
 158                                 (ipvs->sysctl_amemthresh-availmem);
 159                         ipvs->sysctl_drop_packet = 2;
 160                 } else {
 161                         ipvs->drop_rate = 0;
 162                 }
 163                 break;
 164         case 2:
 165                 if (nomem) {
 166                         ipvs->drop_rate = ipvs->drop_counter
 167                                 = ipvs->sysctl_amemthresh /
 168                                 (ipvs->sysctl_amemthresh-availmem);
 169                 } else {
 170                         ipvs->drop_rate = 0;
 171                         ipvs->sysctl_drop_packet = 1;
 172                 }
 173                 break;
 174         case 3:
 175                 ipvs->drop_rate = ipvs->sysctl_am_droprate;
 176                 break;
 177         }
 178         spin_unlock(&ipvs->droppacket_lock);
 179
 180         /* secure_tcp */
 181         spin_lock(&ipvs->securetcp_lock);
 182         switch (ipvs->sysctl_secure_tcp) {
 183         case 0:
 184                 if (old_secure_tcp >= 2)
 185                         to_change = 0;
 186                 break;
 187         case 1:
 188                 if (nomem) {
 189                         if (old_secure_tcp < 2)
 190                                 to_change = 1;
 191                         ipvs->sysctl_secure_tcp = 2;
 192                 } else {
 193                         if (old_secure_tcp >= 2)
 194                                 to_change = 0;
 195                 }
 196                 break;
 197         case 2:
 198                 if (nomem) {
 199                         if (old_secure_tcp < 2)
 200                                 to_change = 1;
 201                 } else {
 202                         if (old_secure_tcp >= 2)
 203                                 to_change = 0;
 204                         ipvs->sysctl_secure_tcp = 1;
 205                 }
 206                 break;
 207         case 3:
 208                 if (old_secure_tcp < 2)
 209                         to_change = 1;
 210                 break;
 211         }
 212         old_secure_tcp = ipvs->sysctl_secure_tcp;
 213         if (to_change >= 0)
 214                 ip_vs_protocol_timeout_change(ipvs,
 215                                               ipvs->sysctl_secure_tcp > 1);
 216         spin_unlock(&ipvs->securetcp_lock);
 217
 218         local_bh_enable();
 219 }
 220
 221
 222 /*
 223  *      Timer for checking the defense
 224  */
 225 #define DEFENSE_TIMER_PERIOD    1*HZ
 226
 227 static void defense_work_handler(struct work_struct *work)
 228 {
 229         struct netns_ipvs *ipvs =
 230                 container_of(work, struct netns_ipvs, defense_work.work);
 231
 232         update_defense_level(ipvs);
 233         if (atomic_read(&ipvs->dropentry))
 234                 ip_vs_random_dropentry(ipvs->net);
 235         schedule_delayed_work(&ipvs->defense_work, DEFENSE_TIMER_PERIOD);
 236 }
 237 #endif
 238
 239 int
 240 ip_vs_use_count_inc(void)
 241 {
 242         return try_module_get(THIS_MODULE);
 243 }
 244
 245 void
 246 ip_vs_use_count_dec(void)
 247 {
 248         module_put(THIS_MODULE);
 249 }
 250
 251
 252 /*
 253  *      Hash table: for virtual service lookups
 254  */
 255 #define IP_VS_SVC_TAB_BITS 8
 256 #define IP_VS_SVC_TAB_SIZE (1 << IP_VS_SVC_TAB_BITS)
 257 #define IP_VS_SVC_TAB_MASK (IP_VS_SVC_TAB_SIZE - 1)
 258
 259 /* the service table hashed by <protocol, addr, port> */
 260 static struct list_head ip_vs_svc_table[IP_VS_SVC_TAB_SIZE];
 261 /* the service table hashed by fwmark */
 262 static struct list_head ip_vs_svc_fwm_table[IP_VS_SVC_TAB_SIZE];
 263
 264
 265 /*
 266  *      Returns hash value for virtual service
 267  */
 268 static inline unsigned int
 269 ip_vs_svc_hashkey(struct net *net, int af, unsigned int proto,
 270                   const union nf_inet_addr *addr, __be16 port)
 271 {
 272         register unsigned int porth = ntohs(port);
 273         __be32 addr_fold = addr->ip;
 274         __u32 ahash;
 275
 276 #ifdef CONFIG_IP_VS_IPV6
 277         if (af == AF_INET6)
 278                 addr_fold = addr->ip6[0]^addr->ip6[1]^
 279                             addr->ip6[2]^addr->ip6[3];
 280 #endif
 281         ahash = ntohl(addr_fold);
 282         ahash ^= ((size_t) net >> 8);
 283
 284         return (proto ^ ahash ^ (porth >> IP_VS_SVC_TAB_BITS) ^ porth) &
 285                IP_VS_SVC_TAB_MASK;
 286 }
 287
 288 /*
 289  *      Returns hash value of fwmark for virtual service lookup
 290  */
 291 static inline unsigned int ip_vs_svc_fwm_hashkey(struct net *net, __u32 fwmark)
 292 {
 293         return (((size_t)net>>8) ^ fwmark) & IP_VS_SVC_TAB_MASK;
 294 }
 295
 296 /*
 297  *      Hashes a service in the ip_vs_svc_table by <netns,proto,addr,port>
 298  *      or in the ip_vs_svc_fwm_table by fwmark.
 299  *      Should be called with locked tables.
 300  */
 301 static int ip_vs_svc_hash(struct ip_vs_service *svc)
 302 {
 303         unsigned int hash;
 304
 305         if (svc->flags & IP_VS_SVC_F_HASHED) {
 306                 pr_err("%s(): request for already hashed, called from %pF\n",
 307                        __func__, __builtin_return_address(0));
 308                 return 0;
 309         }
 310
 311         if (svc->fwmark == 0) {
 312                 /*
 313                  *  Hash it by <netns,protocol,addr,port> in ip_vs_svc_table
 314                  */
 315                 hash = ip_vs_svc_hashkey(svc->net, svc->af, svc->protocol,
 316                                          &svc->addr, svc->port);
 317                 list_add(&svc->s_list, &ip_vs_svc_table[hash]);
 318         } else {
 319                 /*
 320                  *  Hash it by fwmark in svc_fwm_table
 321                  */
 322                 hash = ip_vs_svc_fwm_hashkey(svc->net, svc->fwmark);
 323                 list_add(&svc->f_list, &ip_vs_svc_fwm_table[hash]);
 324         }
 325
 326         svc->flags |= IP_VS_SVC_F_HASHED;
 327         /* increase its refcnt because it is referenced by the svc table */
 328         atomic_inc(&svc->refcnt);
 329         return 1;
 330 }
 331
 332
 333 /*
 334  *      Unhashes a service from svc_table / svc_fwm_table.
 335  *      Should be called with locked tables.
 336  */
 337 static int ip_vs_svc_unhash(struct ip_vs_service *svc)
 338 {
 339         if (!(svc->flags & IP_VS_SVC_F_HASHED)) {
 340                 pr_err("%s(): request for unhash flagged, called from %pF\n",
 341                        __func__, __builtin_return_address(0));
 342                 return 0;
 343         }
 344
 345         if (svc->fwmark == 0) {
 346                 /* Remove it from the svc_table table */
 347                 list_del(&svc->s_list);
 348         } else {
 349                 /* Remove it from the svc_fwm_table table */
 350                 list_del(&svc->f_list);
 351         }
 352
 353         svc->flags &= ~IP_VS_SVC_F_HASHED;
 354         atomic_dec(&svc->refcnt);
 355         return 1;
 356 }
 357
 358
 359 /*
 360  *      Get service by {netns, proto,addr,port} in the service table.
 361  */
 362 static inline struct ip_vs_service *
 363 __ip_vs_service_find(struct net *net, int af, __u16 protocol,
 364                      const union nf_inet_addr *vaddr, __be16 vport)
 365 {
 366         unsigned int hash;
 367         struct ip_vs_service *svc;
 368
 369         /* Check for "full" addressed entries */
 370         hash = ip_vs_svc_hashkey(net, af, protocol, vaddr, vport);
 371
 372         list_for_each_entry(svc, &ip_vs_svc_table[hash], s_list){
 373                 if ((svc->af == af)
 374                     && ip_vs_addr_equal(af, &svc->addr, vaddr)
 375                     && (svc->port == vport)
 376                     && (svc->protocol == protocol)
 377                     && net_eq(svc->net, net)) {
 378                         /* HIT */
 379                         return svc;
 380                 }
 381         }
 382
 383         return NULL;
 384 }
 385
 386
 387 /*
 388  *      Get service by {fwmark} in the service table.
 389  */
 390 static inline struct ip_vs_service *
 391 __ip_vs_svc_fwm_find(struct net *net, int af, __u32 fwmark)
 392 {
 393         unsigned int hash;
 394         struct ip_vs_service *svc;
 395
 396         /* Check for fwmark addressed entries */
 397         hash = ip_vs_svc_fwm_hashkey(net, fwmark);
 398
 399         list_for_each_entry(svc, &ip_vs_svc_fwm_table[hash], f_list) {
 400                 if (svc->fwmark == fwmark && svc->af == af
 401                     && net_eq(svc->net, net)) {
 402                         /* HIT */
 403                         return svc;
 404                 }
 405         }
 406
 407         return NULL;
 408 }
 409
 410 struct ip_vs_service *
 411 ip_vs_service_get(struct net *net, int af, __u32 fwmark, __u16 protocol,
 412                   const union nf_inet_addr *vaddr, __be16 vport)
 413 {
 414         struct ip_vs_service *svc;
 415         struct netns_ipvs *ipvs = net_ipvs(net);
 416
 417         read_lock(&__ip_vs_svc_lock);
 418
 419         /*
 420          *      Check the table hashed by fwmark first
 421          */
 422         if (fwmark) {
 423                 svc = __ip_vs_svc_fwm_find(net, af, fwmark);
 424                 if (svc)
 425                         goto out;
 426         }
 427
 428         /*
 429          *      Check the table hashed by <protocol,addr,port>
 430          *      for "full" addressed entries
 431          */
 432         svc = __ip_vs_service_find(net, af, protocol, vaddr, vport);
 433
 434         if (svc == NULL
 435             && protocol == IPPROTO_TCP
 436             && atomic_read(&ipvs->ftpsvc_counter)
 437             && (vport == FTPDATA || ntohs(vport) >= PROT_SOCK)) {
 438                 /*
 439                  * Check if ftp service entry exists, the packet
 440                  * might belong to FTP data connections.
 441                  */
 442                 svc = __ip_vs_service_find(net, af, protocol, vaddr, FTPPORT);
 443         }
 444
 445         if (svc == NULL
 446             && atomic_read(&ipvs->nullsvc_counter)) {
 447                 /*
 448                  * Check if the catch-all port (port zero) exists
 449                  */
 450                 svc = __ip_vs_service_find(net, af, protocol, vaddr, 0);
 451         }
 452
 453   out:
 454         if (svc)
 455                 atomic_inc(&svc->usecnt);
 456         read_unlock(&__ip_vs_svc_lock);
 457
 458         IP_VS_DBG_BUF(9, "lookup service: fwm %u %s %s:%u %s\n",
 459                       fwmark, ip_vs_proto_name(protocol),
 460                       IP_VS_DBG_ADDR(af, vaddr), ntohs(vport),
 461                       svc ? "hit" : "not hit");
 462
 463         return svc;
 464 }
 465
 466
 467 static inline void
 468 __ip_vs_bind_svc(struct ip_vs_dest *dest, struct ip_vs_service *svc)
 469 {
 470         atomic_inc(&svc->refcnt);
 471         dest->svc = svc;
 472 }
 473
 474 static void
 475 __ip_vs_unbind_svc(struct ip_vs_dest *dest)
 476 {
 477         struct ip_vs_service *svc = dest->svc;
 478
 479         dest->svc = NULL;
 480         if (atomic_dec_and_test(&svc->refcnt)) {
 481                 IP_VS_DBG_BUF(3, "Removing service %u/%s:%u usecnt=%d\n",
 482                               svc->fwmark,
 483                               IP_VS_DBG_ADDR(svc->af, &svc->addr),
 484                               ntohs(svc->port), atomic_read(&svc->usecnt));
 485                 free_percpu(svc->stats.cpustats);
 486                 kfree(svc);
 487         }
 488 }
 489
 490
 491 /*
 492  *      Returns hash value for real service
 493  */
 494 static inline unsigned int ip_vs_rs_hashkey(int af,
 495                                             const union nf_inet_addr *addr,
 496                                             __be16 port)
 497 {
 498         register unsigned int porth = ntohs(port);
 499         __be32 addr_fold = addr->ip;
 500
 501 #ifdef CONFIG_IP_VS_IPV6
 502         if (af == AF_INET6)
 503                 addr_fold = addr->ip6[0]^addr->ip6[1]^
 504                             addr->ip6[2]^addr->ip6[3];
 505 #endif
 506
 507         return (ntohl(addr_fold)^(porth>>IP_VS_RTAB_BITS)^porth)
 508                 & IP_VS_RTAB_MASK;
 509 }
 510
 511 /* Hash ip_vs_dest in rs_table by <proto,addr,port>. */
 512 static void ip_vs_rs_hash(struct netns_ipvs *ipvs, struct ip_vs_dest *dest)
 513 {
 514         unsigned int hash;
 515
 516         if (dest->in_rs_table)
 517                 return;
 518
 519         /*
 520          *      Hash by proto,addr,port,
 521          *      which are the parameters of the real service.
 522          */
 523         hash = ip_vs_rs_hashkey(dest->af, &dest->addr, dest->port);
 524
 525         hlist_add_head_rcu(&dest->d_list, &ipvs->rs_table[hash]);
 526         dest->in_rs_table = 1;
 527 }
 528
 529 /* Unhash ip_vs_dest from rs_table. */
 530 static void ip_vs_rs_unhash(struct ip_vs_dest *dest)
 531 {
 532         /*
 533          * Remove it from the rs_table table.
 534          */
 535         if (dest->in_rs_table) {
 536                 hlist_del_rcu(&dest->d_list);
 537                 dest->in_rs_table = 0;
 538         }
 539 }
 540
 541 /* Check if real service by <proto,addr,port> is present */
 542 bool ip_vs_has_real_service(struct net *net, int af, __u16 protocol,
 543                             const union nf_inet_addr *daddr, __be16 dport)
 544 {
 545         struct netns_ipvs *ipvs = net_ipvs(net);
 546         unsigned int hash;
 547         struct ip_vs_dest *dest;
 548
 549         /* Check for "full" addressed entries */
 550         hash = ip_vs_rs_hashkey(af, daddr, dport);
 551
 552         rcu_read_lock();
 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                         rcu_read_unlock();
 560                         return true;
 561                 }
 562         }
 563         rcu_read_unlock();
 564
 565         return false;
 566 }
 567
 568 /*
 569  *      Lookup destination by {addr,port} in the given service
 570  */
 571 static struct ip_vs_dest *
 572 ip_vs_lookup_dest(struct ip_vs_service *svc, const union nf_inet_addr *daddr,
 573                   __be16 dport)
 574 {
 575         struct ip_vs_dest *dest;
 576
 577         /*
 578          * Find the destination for the given service
 579          */
 580         list_for_each_entry(dest, &svc->destinations, n_list) {
 581                 if ((dest->af == svc->af)
 582                     && ip_vs_addr_equal(svc->af, &dest->addr, daddr)
 583                     && (dest->port == dport)) {
 584                         /* HIT */
 585                         return dest;
 586                 }
 587         }
 588
 589         return NULL;
 590 }
 591
 592 /*
 593  * Find destination by {daddr,dport,vaddr,protocol}
 594  * Cretaed to be used in ip_vs_process_message() in
 595  * the backup synchronization daemon. It finds the
 596  * destination to be bound to the received connection
 597  * on the backup.
 598  */
 599 struct ip_vs_dest *ip_vs_find_dest(struct net  *net, int af,
 600                                    const union nf_inet_addr *daddr,
 601                                    __be16 dport,
 602                                    const union nf_inet_addr *vaddr,
 603                                    __be16 vport, __u16 protocol, __u32 fwmark,
 604                                    __u32 flags)
 605 {
 606         struct ip_vs_dest *dest;
 607         struct ip_vs_service *svc;
 608         __be16 port = dport;
 609
 610         svc = ip_vs_service_get(net, af, fwmark, protocol, vaddr, vport);
 611         if (!svc)
 612                 return NULL;
 613         if (fwmark && (flags & IP_VS_CONN_F_FWD_MASK) != IP_VS_CONN_F_MASQ)
 614                 port = 0;
 615         dest = ip_vs_lookup_dest(svc, daddr, port);
 616         if (!dest)
 617                 dest = ip_vs_lookup_dest(svc, daddr, port ^ dport);
 618         if (dest)
 619                 ip_vs_dest_hold(dest);
 620         ip_vs_service_put(svc);
 621         return dest;
 622 }
 623
 624 void ip_vs_dest_dst_rcu_free(struct rcu_head *head)
 625 {
 626         struct ip_vs_dest_dst *dest_dst = container_of(head,
 627                                                        struct ip_vs_dest_dst,
 628                                                        rcu_head);
 629
 630         dst_release(dest_dst->dst_cache);
 631         kfree(dest_dst);
 632 }
 633
 634 /* Release dest_dst and dst_cache for dest in user context */
 635 static void __ip_vs_dst_cache_reset(struct ip_vs_dest *dest)
 636 {
 637         struct ip_vs_dest_dst *old;
 638
 639         old = rcu_dereference_protected(dest->dest_dst, 1);
 640         if (old) {
 641                 RCU_INIT_POINTER(dest->dest_dst, NULL);
 642                 call_rcu(&old->rcu_head, ip_vs_dest_dst_rcu_free);
 643         }
 644 }
 645
 646 /*
 647  *  Lookup dest by {svc,addr,port} in the destination trash.
 648  *  The destination trash is used to hold the destinations that are removed
 649  *  from the service table but are still referenced by some conn entries.
 650  *  The reason to add the destination trash is when the dest is temporary
 651  *  down (either by administrator or by monitor program), the dest can be
 652  *  picked back from the trash, the remaining connections to the dest can
 653  *  continue, and the counting information of the dest is also useful for
 654  *  scheduling.
 655  */
 656 static struct ip_vs_dest *
 657 ip_vs_trash_get_dest(struct ip_vs_service *svc, const union nf_inet_addr *daddr,
 658                      __be16 dport)
 659 {
 660         struct ip_vs_dest *dest;
 661         struct netns_ipvs *ipvs = net_ipvs(svc->net);
 662
 663         /*
 664          * Find the destination in trash
 665          */
 666         spin_lock_bh(&ipvs->dest_trash_lock);
 667         list_for_each_entry(dest, &ipvs->dest_trash, t_list) {
 668                 IP_VS_DBG_BUF(3, "Destination %u/%s:%u still in trash, "
 669                               "dest->refcnt=%d\n",
 670                               dest->vfwmark,
 671                               IP_VS_DBG_ADDR(svc->af, &dest->addr),
 672                               ntohs(dest->port),
 673                               atomic_read(&dest->refcnt));
 674                 /* We can not reuse dest while in grace period
 675                  * because conns still can use dest->svc
 676                  */
 677                 if (test_bit(IP_VS_DEST_STATE_REMOVING, &dest->state))
 678                         continue;
 679                 if (dest->af == svc->af &&
 680                     ip_vs_addr_equal(svc->af, &dest->addr, daddr) &&
 681                     dest->port == dport &&
 682                     dest->vfwmark == svc->fwmark &&
 683                     dest->protocol == svc->protocol &&
 684                     (svc->fwmark ||
 685                      (ip_vs_addr_equal(svc->af, &dest->vaddr, &svc->addr) &&
 686                       dest->vport == svc->port))) {
 687                         /* HIT */
 688                         list_del(&dest->t_list);
 689                         ip_vs_dest_hold(dest);
 690                         goto out;
 691                 }
 692         }
 693
 694         dest = NULL;
 695
 696 out:
 697         spin_unlock_bh(&ipvs->dest_trash_lock);
 698
 699         return dest;
 700 }
 701
 702 static void ip_vs_dest_free(struct ip_vs_dest *dest)
 703 {
 704         __ip_vs_dst_cache_reset(dest);
 705         __ip_vs_unbind_svc(dest);
 706         free_percpu(dest->stats.cpustats);
 707         kfree(dest);
 708 }
 709
 710 /*
 711  *  Clean up all the destinations in the trash
 712  *  Called by the ip_vs_control_cleanup()
 713  *
 714  *  When the ip_vs_control_clearup is activated by ipvs module exit,
 715  *  the service tables must have been flushed and all the connections
 716  *  are expired, and the refcnt of each destination in the trash must
 717  *  be 0, so we simply release them here.
 718  */
 719 static void ip_vs_trash_cleanup(struct net *net)
 720 {
 721         struct ip_vs_dest *dest, *nxt;
 722         struct netns_ipvs *ipvs = net_ipvs(net);
 723
 724         del_timer_sync(&ipvs->dest_trash_timer);
 725         /* No need to use dest_trash_lock */
 726         list_for_each_entry_safe(dest, nxt, &ipvs->dest_trash, t_list) {
 727                 list_del(&dest->t_list);
 728                 ip_vs_dest_free(dest);
 729         }
 730 }
 731
 732 static void
 733 ip_vs_copy_stats(struct ip_vs_stats_user *dst, struct ip_vs_stats *src)
 734 {
 735 #define IP_VS_SHOW_STATS_COUNTER(c) dst->c = src->ustats.c - src->ustats0.c
 736
 737         spin_lock_bh(&src->lock);
 738
 739         IP_VS_SHOW_STATS_COUNTER(conns);
 740         IP_VS_SHOW_STATS_COUNTER(inpkts);
 741         IP_VS_SHOW_STATS_COUNTER(outpkts);
 742         IP_VS_SHOW_STATS_COUNTER(inbytes);
 743         IP_VS_SHOW_STATS_COUNTER(outbytes);
 744
 745         ip_vs_read_estimator(dst, src);
 746
 747         spin_unlock_bh(&src->lock);
 748 }
 749
 750 static void
 751 ip_vs_zero_stats(struct ip_vs_stats *stats)
 752 {
 753         spin_lock_bh(&stats->lock);
 754
 755         /* get current counters as zero point, rates are zeroed */
 756
 757 #define IP_VS_ZERO_STATS_COUNTER(c) stats->ustats0.c = stats->ustats.c
 758
 759         IP_VS_ZERO_STATS_COUNTER(conns);
 760         IP_VS_ZERO_STATS_COUNTER(inpkts);
 761         IP_VS_ZERO_STATS_COUNTER(outpkts);
 762         IP_VS_ZERO_STATS_COUNTER(inbytes);
 763         IP_VS_ZERO_STATS_COUNTER(outbytes);
 764
 765         ip_vs_zero_estimator(stats);
 766
 767         spin_unlock_bh(&stats->lock);
 768 }
 769
 770 /*
 771  *      Update a destination in the given service
 772  */
 773 static void
 774 __ip_vs_update_dest(struct ip_vs_service *svc, struct ip_vs_dest *dest,
 775                     struct ip_vs_dest_user_kern *udest, int add)
 776 {
 777         struct netns_ipvs *ipvs = net_ipvs(svc->net);
 778         int conn_flags;
 779
 780         /* set the weight and the flags */
 781         atomic_set(&dest->weight, udest->weight);
 782         conn_flags = udest->conn_flags & IP_VS_CONN_F_DEST_MASK;
 783         conn_flags |= IP_VS_CONN_F_INACTIVE;
 784
 785         /* set the IP_VS_CONN_F_NOOUTPUT flag if not masquerading/NAT */
 786         if ((conn_flags & IP_VS_CONN_F_FWD_MASK) != IP_VS_CONN_F_MASQ) {
 787                 conn_flags |= IP_VS_CONN_F_NOOUTPUT;
 788         } else {
 789                 /*
 790                  *    Put the real service in rs_table if not present.
 791                  *    For now only for NAT!
 792                  */
 793                 ip_vs_rs_hash(ipvs, dest);
 794         }
 795         atomic_set(&dest->conn_flags, conn_flags);
 796
 797         /* bind the service */
 798         if (!dest->svc) {
 799                 __ip_vs_bind_svc(dest, svc);
 800         } else {
 801                 if (dest->svc != svc) {
 802                         __ip_vs_unbind_svc(dest);
 803                         ip_vs_zero_stats(&dest->stats);
 804                         __ip_vs_bind_svc(dest, svc);
 805                 }
 806         }
 807
 808         /* set the dest status flags */
 809         dest->flags |= IP_VS_DEST_F_AVAILABLE;
 810
 811         if (udest->u_threshold == 0 || udest->u_threshold > dest->u_threshold)
 812                 dest->flags &= ~IP_VS_DEST_F_OVERLOAD;
 813         dest->u_threshold = udest->u_threshold;
 814         dest->l_threshold = udest->l_threshold;
 815
 816         spin_lock_bh(&dest->dst_lock);
 817         __ip_vs_dst_cache_reset(dest);
 818         spin_unlock_bh(&dest->dst_lock);
 819
 820         if (add)
 821                 ip_vs_start_estimator(svc->net, &dest->stats);
 822
 823         write_lock_bh(&__ip_vs_svc_lock);
 824
 825         /* Wait until all other svc users go away */
 826         IP_VS_WAIT_WHILE(atomic_read(&svc->usecnt) > 0);
 827
 828         if (add) {
 829                 list_add(&dest->n_list, &svc->destinations);
 830                 svc->num_dests++;
 831                 if (svc->scheduler->add_dest)
 832                         svc->scheduler->add_dest(svc, dest);
 833         } else {
 834                 if (svc->scheduler->upd_dest)
 835                         svc->scheduler->upd_dest(svc, dest);
 836         }
 837
 838         /* call the update_service, because server weight may be changed */
 839         if (svc->scheduler->update_service)
 840                 svc->scheduler->update_service(svc);
 841
 842         write_unlock_bh(&__ip_vs_svc_lock);
 843 }
 844
 845
 846 /*
 847  *      Create a destination for the given service
 848  */
 849 static int
 850 ip_vs_new_dest(struct ip_vs_service *svc, struct ip_vs_dest_user_kern *udest,
 851                struct ip_vs_dest **dest_p)
 852 {
 853         struct ip_vs_dest *dest;
 854         unsigned int atype;
 855
 856         EnterFunction(2);
 857
 858 #ifdef CONFIG_IP_VS_IPV6
 859         if (svc->af == AF_INET6) {
 860                 atype = ipv6_addr_type(&udest->addr.in6);
 861                 if ((!(atype & IPV6_ADDR_UNICAST) ||
 862                         atype & IPV6_ADDR_LINKLOCAL) &&
 863                         !__ip_vs_addr_is_local_v6(svc->net, &udest->addr.in6))
 864                         return -EINVAL;
 865         } else
 866 #endif
 867         {
 868                 atype = inet_addr_type(svc->net, udest->addr.ip);
 869                 if (atype != RTN_LOCAL && atype != RTN_UNICAST)
 870                         return -EINVAL;
 871         }
 872
 873         dest = kzalloc(sizeof(struct ip_vs_dest), GFP_KERNEL);
 874         if (dest == NULL)
 875                 return -ENOMEM;
 876
 877         dest->stats.cpustats = alloc_percpu(struct ip_vs_cpu_stats);
 878         if (!dest->stats.cpustats)
 879                 goto err_alloc;
 880
 881         dest->af = svc->af;
 882         dest->protocol = svc->protocol;
 883         dest->vaddr = svc->addr;
 884         dest->vport = svc->port;
 885         dest->vfwmark = svc->fwmark;
 886         ip_vs_addr_copy(svc->af, &dest->addr, &udest->addr);
 887         dest->port = udest->port;
 888
 889         atomic_set(&dest->activeconns, 0);
 890         atomic_set(&dest->inactconns, 0);
 891         atomic_set(&dest->persistconns, 0);
 892         atomic_set(&dest->refcnt, 1);
 893
 894         INIT_HLIST_NODE(&dest->d_list);
 895         spin_lock_init(&dest->dst_lock);
 896         spin_lock_init(&dest->stats.lock);
 897         __ip_vs_update_dest(svc, dest, udest, 1);
 898
 899         *dest_p = dest;
 900
 901         LeaveFunction(2);
 902         return 0;
 903
 904 err_alloc:
 905         kfree(dest);
 906         return -ENOMEM;
 907 }
 908
 909
 910 /*
 911  *      Add a destination into an existing service
 912  */
 913 static int
 914 ip_vs_add_dest(struct ip_vs_service *svc, struct ip_vs_dest_user_kern *udest)
 915 {
 916         struct ip_vs_dest *dest;
 917         union nf_inet_addr daddr;
 918         __be16 dport = udest->port;
 919         int ret;
 920
 921         EnterFunction(2);
 922
 923         if (udest->weight < 0) {
 924                 pr_err("%s(): server weight less than zero\n", __func__);
 925                 return -ERANGE;
 926         }
 927
 928         if (udest->l_threshold > udest->u_threshold) {
 929                 pr_err("%s(): lower threshold is higher than upper threshold\n",
 930                         __func__);
 931                 return -ERANGE;
 932         }
 933
 934         ip_vs_addr_copy(svc->af, &daddr, &udest->addr);
 935
 936         /*
 937          * Check if the dest already exists in the list
 938          */
 939         dest = ip_vs_lookup_dest(svc, &daddr, dport);
 940
 941         if (dest != NULL) {
 942                 IP_VS_DBG(1, "%s(): dest already exists\n", __func__);
 943                 return -EEXIST;
 944         }
 945
 946         /*
 947          * Check if the dest already exists in the trash and
 948          * is from the same service
 949          */
 950         dest = ip_vs_trash_get_dest(svc, &daddr, dport);
 951
 952         if (dest != NULL) {
 953                 IP_VS_DBG_BUF(3, "Get destination %s:%u from trash, "
 954                               "dest->refcnt=%d, service %u/%s:%u\n",
 955                               IP_VS_DBG_ADDR(svc->af, &daddr), ntohs(dport),
 956                               atomic_read(&dest->refcnt),
 957                               dest->vfwmark,
 958                               IP_VS_DBG_ADDR(svc->af, &dest->vaddr),
 959                               ntohs(dest->vport));
 960
 961                 __ip_vs_update_dest(svc, dest, udest, 1);
 962                 ret = 0;
 963         } else {
 964                 /*
 965                  * Allocate and initialize the dest structure
 966                  */
 967                 ret = ip_vs_new_dest(svc, udest, &dest);
 968         }
 969         LeaveFunction(2);
 970
 971         return ret;
 972 }
 973
 974
 975 /*
 976  *      Edit a destination in the given service
 977  */
 978 static int
 979 ip_vs_edit_dest(struct ip_vs_service *svc, struct ip_vs_dest_user_kern *udest)
 980 {
 981         struct ip_vs_dest *dest;
 982         union nf_inet_addr daddr;
 983         __be16 dport = udest->port;
 984
 985         EnterFunction(2);
 986
 987         if (udest->weight < 0) {
 988                 pr_err("%s(): server weight less than zero\n", __func__);
 989                 return -ERANGE;
 990         }
 991
 992         if (udest->l_threshold > udest->u_threshold) {
 993                 pr_err("%s(): lower threshold is higher than upper threshold\n",
 994                         __func__);
 995                 return -ERANGE;
 996         }
 997
 998         ip_vs_addr_copy(svc->af, &daddr, &udest->addr);
 999
1000         /*
1001          *  Lookup the destination list
1002          */
1003         dest = ip_vs_lookup_dest(svc, &daddr, dport);
1004
1005         if (dest == NULL) {
1006                 IP_VS_DBG(1, "%s(): dest doesn't exist\n", __func__);
1007                 return -ENOENT;
1008         }
1009
1010         __ip_vs_update_dest(svc, dest, udest, 0);
1011         LeaveFunction(2);
1012
1013         return 0;
1014 }
1015
1016 static void ip_vs_dest_wait_readers(struct rcu_head *head)
1017 {
1018         struct ip_vs_dest *dest = container_of(head, struct ip_vs_dest,
1019                                                rcu_head);
1020
1021         /* End of grace period after unlinking */
1022         clear_bit(IP_VS_DEST_STATE_REMOVING, &dest->state);
1023 }
1024
1025
1026 /*
1027  *      Delete a destination (must be already unlinked from the service)
1028  */
1029 static void __ip_vs_del_dest(struct net *net, struct ip_vs_dest *dest,
1030                              bool cleanup)
1031 {
1032         struct netns_ipvs *ipvs = net_ipvs(net);
1033
1034         ip_vs_stop_estimator(net, &dest->stats);
1035
1036         /*
1037          *  Remove it from the d-linked list with the real services.
1038          */
1039         ip_vs_rs_unhash(dest);
1040
1041         if (!cleanup) {
1042                 set_bit(IP_VS_DEST_STATE_REMOVING, &dest->state);
1043                 call_rcu(&dest->rcu_head, ip_vs_dest_wait_readers);
1044         }
1045
1046         spin_lock_bh(&ipvs->dest_trash_lock);
1047         IP_VS_DBG_BUF(3, "Moving dest %s:%u into trash, dest->refcnt=%d\n",
1048                       IP_VS_DBG_ADDR(dest->af, &dest->addr), ntohs(dest->port),
1049                       atomic_read(&dest->refcnt));
1050         if (list_empty(&ipvs->dest_trash) && !cleanup)
1051                 mod_timer(&ipvs->dest_trash_timer,
1052                           jiffies + IP_VS_DEST_TRASH_PERIOD);
1053         /* dest lives in trash without reference */
1054         list_add(&dest->t_list, &ipvs->dest_trash);
1055         spin_unlock_bh(&ipvs->dest_trash_lock);
1056         ip_vs_dest_put(dest);
1057 }
1058
1059
1060 /*
1061  *      Unlink a destination from the given service
1062  */
1063 static void __ip_vs_unlink_dest(struct ip_vs_service *svc,
1064                                 struct ip_vs_dest *dest,
1065                                 int svcupd)
1066 {
1067         dest->flags &= ~IP_VS_DEST_F_AVAILABLE;
1068
1069         /*
1070          *  Remove it from the d-linked destination list.
1071          */
1072         list_del(&dest->n_list);
1073         svc->num_dests--;
1074
1075         if (svcupd && svc->scheduler->del_dest)
1076                 svc->scheduler->del_dest(svc, dest);
1077
1078         /*
1079          *  Call the update_service function of its scheduler
1080          */
1081         if (svcupd && svc->scheduler->update_service)
1082                         svc->scheduler->update_service(svc);
1083 }
1084
1085
1086 /*
1087  *      Delete a destination server in the given service
1088  */
1089 static int
1090 ip_vs_del_dest(struct ip_vs_service *svc, struct ip_vs_dest_user_kern *udest)
1091 {
1092         struct ip_vs_dest *dest;
1093         __be16 dport = udest->port;
1094
1095         EnterFunction(2);
1096
1097         dest = ip_vs_lookup_dest(svc, &udest->addr, dport);
1098
1099         if (dest == NULL) {
1100                 IP_VS_DBG(1, "%s(): destination not found!\n", __func__);
1101                 return -ENOENT;
1102         }
1103
1104         write_lock_bh(&__ip_vs_svc_lock);
1105
1106         /*
1107          *      Wait until all other svc users go away.
1108          */
1109         IP_VS_WAIT_WHILE(atomic_read(&svc->usecnt) > 0);
1110
1111         /*
1112          *      Unlink dest from the service
1113          */
1114         __ip_vs_unlink_dest(svc, dest, 1);
1115
1116         write_unlock_bh(&__ip_vs_svc_lock);
1117
1118         /*
1119          *      Delete the destination
1120          */
1121         __ip_vs_del_dest(svc->net, dest, false);
1122
1123         LeaveFunction(2);
1124
1125         return 0;
1126 }
1127
1128 static void ip_vs_dest_trash_expire(unsigned long data)
1129 {
1130         struct net *net = (struct net *) data;
1131         struct netns_ipvs *ipvs = net_ipvs(net);
1132         struct ip_vs_dest *dest, *next;
1133
1134         spin_lock(&ipvs->dest_trash_lock);
1135         list_for_each_entry_safe(dest, next, &ipvs->dest_trash, t_list) {
1136                 /* Skip if dest is in grace period */
1137                 if (test_bit(IP_VS_DEST_STATE_REMOVING, &dest->state))
1138                         continue;
1139                 if (atomic_read(&dest->refcnt) > 0)
1140                         continue;
1141                 IP_VS_DBG_BUF(3, "Removing destination %u/%s:%u from trash\n",
1142                               dest->vfwmark,
1143                               IP_VS_DBG_ADDR(dest->svc->af, &dest->addr),
1144                               ntohs(dest->port));
1145                 list_del(&dest->t_list);
1146                 ip_vs_dest_free(dest);
1147         }
1148         if (!list_empty(&ipvs->dest_trash))
1149                 mod_timer(&ipvs->dest_trash_timer,
1150                           jiffies + IP_VS_DEST_TRASH_PERIOD);
1151         spin_unlock(&ipvs->dest_trash_lock);
1152 }
1153
1154 /*
1155  *      Add a service into the service hash table
1156  */
1157 static int
1158 ip_vs_add_service(struct net *net, struct ip_vs_service_user_kern *u,
1159                   struct ip_vs_service **svc_p)
1160 {
1161         int ret = 0;
1162         struct ip_vs_scheduler *sched = NULL;
1163         struct ip_vs_pe *pe = NULL;
1164         struct ip_vs_service *svc = NULL;
1165         struct netns_ipvs *ipvs = net_ipvs(net);
1166
1167         /* increase the module use count */
1168         ip_vs_use_count_inc();
1169
1170         /* Lookup the scheduler by 'u->sched_name' */
1171         sched = ip_vs_scheduler_get(u->sched_name);
1172         if (sched == NULL) {
1173                 pr_info("Scheduler module ip_vs_%s not found\n", u->sched_name);
1174                 ret = -ENOENT;
1175                 goto out_err;
1176         }
1177
1178         if (u->pe_name && *u->pe_name) {
1179                 pe = ip_vs_pe_getbyname(u->pe_name);
1180                 if (pe == NULL) {
1181                         pr_info("persistence engine module ip_vs_pe_%s "
1182                                 "not found\n", u->pe_name);
1183                         ret = -ENOENT;
1184                         goto out_err;
1185                 }
1186         }
1187
1188 #ifdef CONFIG_IP_VS_IPV6
1189         if (u->af == AF_INET6 && (u->netmask < 1 || u->netmask > 128)) {
1190                 ret = -EINVAL;
1191                 goto out_err;
1192         }
1193 #endif
1194
1195         svc = kzalloc(sizeof(struct ip_vs_service), GFP_KERNEL);
1196         if (svc == NULL) {
1197                 IP_VS_DBG(1, "%s(): no memory\n", __func__);
1198                 ret = -ENOMEM;
1199                 goto out_err;
1200         }
1201         svc->stats.cpustats = alloc_percpu(struct ip_vs_cpu_stats);
1202         if (!svc->stats.cpustats) {
1203                 ret = -ENOMEM;
1204                 goto out_err;
1205         }
1206
1207         /* I'm the first user of the service */
1208         atomic_set(&svc->usecnt, 0);
1209         atomic_set(&svc->refcnt, 0);
1210
1211         svc->af = u->af;
1212         svc->protocol = u->protocol;
1213         ip_vs_addr_copy(svc->af, &svc->addr, &u->addr);
1214         svc->port = u->port;
1215         svc->fwmark = u->fwmark;
1216         svc->flags = u->flags;
1217         svc->timeout = u->timeout * HZ;
1218         svc->netmask = u->netmask;
1219         svc->net = net;
1220
1221         INIT_LIST_HEAD(&svc->destinations);
1222         spin_lock_init(&svc->sched_lock);
1223         spin_lock_init(&svc->stats.lock);
1224
1225         /* Bind the scheduler */
1226         ret = ip_vs_bind_scheduler(svc, sched);
1227         if (ret)
1228                 goto out_err;
1229         sched = NULL;
1230
1231         /* Bind the ct retriever */
1232         ip_vs_bind_pe(svc, pe);
1233         pe = NULL;
1234
1235         /* Update the virtual service counters */
1236         if (svc->port == FTPPORT)
1237                 atomic_inc(&ipvs->ftpsvc_counter);
1238         else if (svc->port == 0)
1239                 atomic_inc(&ipvs->nullsvc_counter);
1240
1241         ip_vs_start_estimator(net, &svc->stats);
1242
1243         /* Count only IPv4 services for old get/setsockopt interface */
1244         if (svc->af == AF_INET)
1245                 ipvs->num_services++;
1246
1247         /* Hash the service into the service table */
1248         write_lock_bh(&__ip_vs_svc_lock);
1249         ip_vs_svc_hash(svc);
1250         write_unlock_bh(&__ip_vs_svc_lock);
1251
1252         *svc_p = svc;
1253         /* Now there is a service - full throttle */
1254         ipvs->enable = 1;
1255         return 0;
1256
1257
1258  out_err:
1259         if (svc != NULL) {
1260                 ip_vs_unbind_scheduler(svc);
1261                 if (svc->inc) {
1262                         local_bh_disable();
1263                         ip_vs_app_inc_put(svc->inc);
1264                         local_bh_enable();
1265                 }
1266                 if (svc->stats.cpustats)
1267                         free_percpu(svc->stats.cpustats);
1268                 kfree(svc);
1269         }
1270         ip_vs_scheduler_put(sched);
1271         ip_vs_pe_put(pe);
1272
1273         /* decrease the module use count */
1274         ip_vs_use_count_dec();
1275
1276         return ret;
1277 }
1278
1279
1280 /*
1281  *      Edit a service and bind it with a new scheduler
1282  */
1283 static int
1284 ip_vs_edit_service(struct ip_vs_service *svc, struct ip_vs_service_user_kern *u)
1285 {
1286         struct ip_vs_scheduler *sched, *old_sched;
1287         struct ip_vs_pe *pe = NULL, *old_pe = NULL;
1288         int ret = 0;
1289
1290         /*
1291          * Lookup the scheduler, by 'u->sched_name'
1292          */
1293         sched = ip_vs_scheduler_get(u->sched_name);
1294         if (sched == NULL) {
1295                 pr_info("Scheduler module ip_vs_%s not found\n", u->sched_name);
1296                 return -ENOENT;
1297         }
1298         old_sched = sched;
1299
1300         if (u->pe_name && *u->pe_name) {
1301                 pe = ip_vs_pe_getbyname(u->pe_name);
1302                 if (pe == NULL) {
1303                         pr_info("persistence engine module ip_vs_pe_%s "
1304                                 "not found\n", u->pe_name);
1305                         ret = -ENOENT;
1306                         goto out;
1307                 }
1308                 old_pe = pe;
1309         }
1310
1311 #ifdef CONFIG_IP_VS_IPV6
1312         if (u->af == AF_INET6 && (u->netmask < 1 || u->netmask > 128)) {
1313                 ret = -EINVAL;
1314                 goto out;
1315         }
1316 #endif
1317
1318         write_lock_bh(&__ip_vs_svc_lock);
1319
1320         /*
1321          * Wait until all other svc users go away.
1322          */
1323         IP_VS_WAIT_WHILE(atomic_read(&svc->usecnt) > 0);
1324
1325         /*
1326          * Set the flags and timeout value
1327          */
1328         svc->flags = u->flags | IP_VS_SVC_F_HASHED;
1329         svc->timeout = u->timeout * HZ;
1330         svc->netmask = u->netmask;
1331
1332         old_sched = svc->scheduler;
1333         if (sched != old_sched) {
1334                 /*
1335                  * Unbind the old scheduler
1336                  */
1337                 ip_vs_unbind_scheduler(svc);
1338
1339                 /*
1340                  * Bind the new scheduler
1341                  */
1342                 if ((ret = ip_vs_bind_scheduler(svc, sched))) {
1343                         /*
1344                          * If ip_vs_bind_scheduler fails, restore the old
1345                          * scheduler.
1346                          * The main reason of failure is out of memory.
1347                          *
1348                          * The question is if the old scheduler can be
1349                          * restored all the time. TODO: if it cannot be
1350                          * restored some time, we must delete the service,
1351                          * otherwise the system may crash.
1352                          */
1353                         ip_vs_bind_scheduler(svc, old_sched);
1354                         old_sched = sched;
1355                         goto out_unlock;
1356                 }
1357         }
1358
1359         old_pe = svc->pe;
1360         if (pe != old_pe) {
1361                 ip_vs_unbind_pe(svc);
1362                 ip_vs_bind_pe(svc, pe);
1363         }
1364
1365 out_unlock:
1366         write_unlock_bh(&__ip_vs_svc_lock);
1367 out:
1368         ip_vs_scheduler_put(old_sched);
1369         ip_vs_pe_put(old_pe);
1370         return ret;
1371 }
1372
1373
1374 /*
1375  *      Delete a service from the service list
1376  *      - The service must be unlinked, unlocked and not referenced!
1377  *      - We are called under _bh lock
1378  */
1379 static void __ip_vs_del_service(struct ip_vs_service *svc, bool cleanup)
1380 {
1381         struct ip_vs_dest *dest, *nxt;
1382         struct ip_vs_scheduler *old_sched;
1383         struct ip_vs_pe *old_pe;
1384         struct netns_ipvs *ipvs = net_ipvs(svc->net);
1385
1386         pr_info("%s: enter\n", __func__);
1387
1388         /* Count only IPv4 services for old get/setsockopt interface */
1389         if (svc->af == AF_INET)
1390                 ipvs->num_services--;
1391
1392         ip_vs_stop_estimator(svc->net, &svc->stats);
1393
1394         /* Unbind scheduler */
1395         old_sched = svc->scheduler;
1396         ip_vs_unbind_scheduler(svc);
1397         ip_vs_scheduler_put(old_sched);
1398
1399         /* Unbind persistence engine */
1400         old_pe = svc->pe;
1401         ip_vs_unbind_pe(svc);
1402         ip_vs_pe_put(old_pe);
1403
1404         /* Unbind app inc */
1405         if (svc->inc) {
1406                 ip_vs_app_inc_put(svc->inc);
1407                 svc->inc = NULL;
1408         }
1409
1410         /*
1411          *    Unlink the whole destination list
1412          */
1413         list_for_each_entry_safe(dest, nxt, &svc->destinations, n_list) {
1414                 __ip_vs_unlink_dest(svc, dest, 0);
1415                 __ip_vs_del_dest(svc->net, dest, cleanup);
1416         }
1417
1418         /*
1419          *    Update the virtual service counters
1420          */
1421         if (svc->port == FTPPORT)
1422                 atomic_dec(&ipvs->ftpsvc_counter);
1423         else if (svc->port == 0)
1424                 atomic_dec(&ipvs->nullsvc_counter);
1425
1426         /*
1427          *    Free the service if nobody refers to it
1428          */
1429         if (atomic_read(&svc->refcnt) == 0) {
1430                 IP_VS_DBG_BUF(3, "Removing service %u/%s:%u usecnt=%d\n",
1431                               svc->fwmark,
1432                               IP_VS_DBG_ADDR(svc->af, &svc->addr),
1433                               ntohs(svc->port), atomic_read(&svc->usecnt));
1434                 free_percpu(svc->stats.cpustats);
1435                 kfree(svc);
1436         }
1437
1438         /* decrease the module use count */
1439         ip_vs_use_count_dec();
1440 }
1441
1442 /*
1443  * Unlink a service from list and try to delete it if its refcnt reached 0
1444  */
1445 static void ip_vs_unlink_service(struct ip_vs_service *svc, bool cleanup)
1446 {
1447         /*
1448          * Unhash it from the service table
1449          */
1450         write_lock_bh(&__ip_vs_svc_lock);
1451
1452         ip_vs_svc_unhash(svc);
1453
1454         /*
1455          * Wait until all the svc users go away.
1456          */
1457         IP_VS_WAIT_WHILE(atomic_read(&svc->usecnt) > 0);
1458
1459         __ip_vs_del_service(svc, cleanup);
1460
1461         write_unlock_bh(&__ip_vs_svc_lock);
1462 }
1463
1464 /*
1465  *      Delete a service from the service list
1466  */
1467 static int ip_vs_del_service(struct ip_vs_service *svc)
1468 {
1469         if (svc == NULL)
1470                 return -EEXIST;
1471         ip_vs_unlink_service(svc, false);
1472
1473         return 0;
1474 }
1475
1476
1477 /*
1478  *      Flush all the virtual services
1479  */
1480 static int ip_vs_flush(struct net *net, bool cleanup)
1481 {
1482         int idx;
1483         struct ip_vs_service *svc, *nxt;
1484
1485         /*
1486          * Flush the service table hashed by <netns,protocol,addr,port>
1487          */
1488         for(idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
1489                 list_for_each_entry_safe(svc, nxt, &ip_vs_svc_table[idx],
1490                                          s_list) {
1491                         if (net_eq(svc->net, net))
1492                                 ip_vs_unlink_service(svc, cleanup);
1493                 }
1494         }
1495
1496         /*
1497          * Flush the service table hashed by fwmark
1498          */
1499         for(idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
1500                 list_for_each_entry_safe(svc, nxt,
1501                                          &ip_vs_svc_fwm_table[idx], f_list) {
1502                         if (net_eq(svc->net, net))
1503                                 ip_vs_unlink_service(svc, cleanup);
1504                 }
1505         }
1506
1507         return 0;
1508 }
1509
1510 /*
1511  *      Delete service by {netns} in the service table.
1512  *      Called by __ip_vs_cleanup()
1513  */
1514 void ip_vs_service_net_cleanup(struct net *net)
1515 {
1516         EnterFunction(2);
1517         /* Check for "full" addressed entries */
1518         mutex_lock(&__ip_vs_mutex);
1519         ip_vs_flush(net, true);
1520         mutex_unlock(&__ip_vs_mutex);
1521         LeaveFunction(2);
1522 }
1523
1524 /* Put all references for device (dst_cache) */
1525 static inline void
1526 ip_vs_forget_dev(struct ip_vs_dest *dest, struct net_device *dev)
1527 {
1528         spin_lock_bh(&dest->dst_lock);
1529         if (dest->dest_dst && dest->dest_dst->dst_cache->dev == dev) {
1530                 IP_VS_DBG_BUF(3, "Reset dev:%s dest %s:%u ,dest->refcnt=%d\n",
1531                               dev->name,
1532                               IP_VS_DBG_ADDR(dest->af, &dest->addr),
1533                               ntohs(dest->port),
1534                               atomic_read(&dest->refcnt));
1535                 __ip_vs_dst_cache_reset(dest);
1536         }
1537         spin_unlock_bh(&dest->dst_lock);
1538
1539 }
1540 /* Netdev event receiver
1541  * Currently only NETDEV_DOWN is handled to release refs to cached dsts
1542  */
1543 static int ip_vs_dst_event(struct notifier_block *this, unsigned long event,
1544                             void *ptr)
1545 {
1546         struct net_device *dev = ptr;
1547         struct net *net = dev_net(dev);
1548         struct netns_ipvs *ipvs = net_ipvs(net);
1549         struct ip_vs_service *svc;
1550         struct ip_vs_dest *dest;
1551         unsigned int idx;
1552
1553         if (event != NETDEV_DOWN || !ipvs)
1554                 return NOTIFY_DONE;
1555         IP_VS_DBG(3, "%s() dev=%s\n", __func__, dev->name);
1556         EnterFunction(2);
1557         mutex_lock(&__ip_vs_mutex);
1558         for (idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
1559                 list_for_each_entry(svc, &ip_vs_svc_table[idx], s_list) {
1560                         if (net_eq(svc->net, net)) {
1561                                 list_for_each_entry(dest, &svc->destinations,
1562                                                     n_list) {
1563                                         ip_vs_forget_dev(dest, dev);
1564                                 }
1565                         }
1566                 }
1567
1568                 list_for_each_entry(svc, &ip_vs_svc_fwm_table[idx], f_list) {
1569                         if (net_eq(svc->net, net)) {
1570                                 list_for_each_entry(dest, &svc->destinations,
1571                                                     n_list) {
1572                                         ip_vs_forget_dev(dest, dev);
1573                                 }
1574                         }
1575
1576                 }
1577         }
1578
1579         spin_lock_bh(&ipvs->dest_trash_lock);
1580         list_for_each_entry(dest, &ipvs->dest_trash, t_list) {
1581                 ip_vs_forget_dev(dest, dev);
1582         }
1583         spin_unlock_bh(&ipvs->dest_trash_lock);
1584         mutex_unlock(&__ip_vs_mutex);
1585         LeaveFunction(2);
1586         return NOTIFY_DONE;
1587 }
1588
1589 /*
1590  *      Zero counters in a service or all services
1591  */
1592 static int ip_vs_zero_service(struct ip_vs_service *svc)
1593 {
1594         struct ip_vs_dest *dest;
1595
1596         write_lock_bh(&__ip_vs_svc_lock);
1597         list_for_each_entry(dest, &svc->destinations, n_list) {
1598                 ip_vs_zero_stats(&dest->stats);
1599         }
1600         ip_vs_zero_stats(&svc->stats);
1601         write_unlock_bh(&__ip_vs_svc_lock);
1602         return 0;
1603 }
1604
1605 static int ip_vs_zero_all(struct net *net)
1606 {
1607         int idx;
1608         struct ip_vs_service *svc;
1609
1610         for(idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
1611                 list_for_each_entry(svc, &ip_vs_svc_table[idx], s_list) {
1612                         if (net_eq(svc->net, net))
1613                                 ip_vs_zero_service(svc);
1614                 }
1615         }
1616
1617         for(idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
1618                 list_for_each_entry(svc, &ip_vs_svc_fwm_table[idx], f_list) {
1619                         if (net_eq(svc->net, net))
1620                                 ip_vs_zero_service(svc);
1621                 }
1622         }
1623
1624         ip_vs_zero_stats(&net_ipvs(net)->tot_stats);
1625         return 0;
1626 }
1627
1628 #ifdef CONFIG_SYSCTL
1629
1630 static int zero;
1631 static int three = 3;
1632
1633 static int
1634 proc_do_defense_mode(ctl_table *table, int write,
1635                      void __user *buffer, size_t *lenp, loff_t *ppos)
1636 {
1637         struct net *net = current->nsproxy->net_ns;
1638         int *valp = table->data;
1639         int val = *valp;
1640         int rc;
1641
1642         rc = proc_dointvec(table, write, buffer, lenp, ppos);
1643         if (write && (*valp != val)) {
1644                 if ((*valp < 0) || (*valp > 3)) {
1645                         /* Restore the correct value */
1646                         *valp = val;
1647                 } else {
1648                         update_defense_level(net_ipvs(net));
1649                 }
1650         }
1651         return rc;
1652 }
1653
1654 static int
1655 proc_do_sync_threshold(ctl_table *table, int write,
1656                        void __user *buffer, size_t *lenp, loff_t *ppos)
1657 {
1658         int *valp = table->data;
1659         int val[2];
1660         int rc;
1661
1662         /* backup the value first */
1663         memcpy(val, valp, sizeof(val));
1664
1665         rc = proc_dointvec(table, write, buffer, lenp, ppos);
1666         if (write && (valp[0] < 0 || valp[1] < 0 ||
1667             (valp[0] >= valp[1] && valp[1]))) {
1668                 /* Restore the correct value */
1669                 memcpy(valp, val, sizeof(val));
1670         }
1671         return rc;
1672 }
1673
1674 static int
1675 proc_do_sync_mode(ctl_table *table, int write,
1676                      void __user *buffer, size_t *lenp, loff_t *ppos)
1677 {
1678         int *valp = table->data;
1679         int val = *valp;
1680         int rc;
1681
1682         rc = proc_dointvec(table, write, buffer, lenp, ppos);
1683         if (write && (*valp != val)) {
1684                 if ((*valp < 0) || (*valp > 1)) {
1685                         /* Restore the correct value */
1686                         *valp = val;
1687                 }
1688         }
1689         return rc;
1690 }
1691
1692 static int
1693 proc_do_sync_ports(ctl_table *table, int write,
1694                    void __user *buffer, size_t *lenp, loff_t *ppos)
1695 {
1696         int *valp = table->data;
1697         int val = *valp;
1698         int rc;
1699
1700         rc = proc_dointvec(table, write, buffer, lenp, ppos);
1701         if (write && (*valp != val)) {
1702                 if (*valp < 1 || !is_power_of_2(*valp)) {
1703                         /* Restore the correct value */
1704                         *valp = val;
1705                 }
1706         }
1707         return rc;
1708 }
1709
1710 /*
1711  *      IPVS sysctl table (under the /proc/sys/net/ipv4/vs/)
1712  *      Do not change order or insert new entries without
1713  *      align with netns init in ip_vs_control_net_init()
1714  */
1715
1716 static struct ctl_table vs_vars[] = {
1717         {
1718                 .procname       = "amemthresh",
1719                 .maxlen         = sizeof(int),
1720                 .mode           = 0644,
1721                 .proc_handler   = proc_dointvec,
1722         },
1723         {
1724                 .procname       = "am_droprate",
1725                 .maxlen         = sizeof(int),
1726                 .mode           = 0644,
1727                 .proc_handler   = proc_dointvec,
1728         },
1729         {
1730                 .procname       = "drop_entry",
1731                 .maxlen         = sizeof(int),
1732                 .mode           = 0644,
1733                 .proc_handler   = proc_do_defense_mode,
1734         },
1735         {
1736                 .procname       = "drop_packet",
1737                 .maxlen         = sizeof(int),
1738                 .mode           = 0644,
1739                 .proc_handler   = proc_do_defense_mode,
1740         },
1741 #ifdef CONFIG_IP_VS_NFCT
1742         {
1743                 .procname       = "conntrack",
1744                 .maxlen         = sizeof(int),
1745                 .mode           = 0644,
1746                 .proc_handler   = &proc_dointvec,
1747         },
1748 #endif
1749         {
1750                 .procname       = "secure_tcp",
1751                 .maxlen         = sizeof(int),
1752                 .mode           = 0644,
1753                 .proc_handler   = proc_do_defense_mode,
1754         },
1755         {
1756                 .procname       = "snat_reroute",
1757                 .maxlen         = sizeof(int),
1758                 .mode           = 0644,
1759                 .proc_handler   = &proc_dointvec,
1760         },
1761         {
1762                 .procname       = "sync_version",
1763                 .maxlen         = sizeof(int),
1764                 .mode           = 0644,
1765                 .proc_handler   = &proc_do_sync_mode,
1766         },
1767         {
1768                 .procname       = "sync_ports",
1769                 .maxlen         = sizeof(int),
1770                 .mode           = 0644,
1771                 .proc_handler   = &proc_do_sync_ports,
1772         },
1773         {
1774                 .procname       = "sync_qlen_max",
1775                 .maxlen         = sizeof(int),
1776                 .mode           = 0644,
1777                 .proc_handler   = proc_dointvec,
1778         },
1779         {
1780                 .procname       = "sync_sock_size",
1781                 .maxlen         = sizeof(int),
1782                 .mode           = 0644,
1783                 .proc_handler   = proc_dointvec,
1784         },
1785         {
1786                 .procname       = "cache_bypass",
1787                 .maxlen         = sizeof(int),
1788                 .mode           = 0644,
1789                 .proc_handler   = proc_dointvec,
1790         },
1791         {
1792                 .procname       = "expire_nodest_conn",
1793                 .maxlen         = sizeof(int),
1794                 .mode           = 0644,
1795                 .proc_handler   = proc_dointvec,
1796         },
1797         {
1798                 .procname       = "expire_quiescent_template",
1799                 .maxlen         = sizeof(int),
1800                 .mode           = 0644,
1801                 .proc_handler   = proc_dointvec,
1802         },
1803         {
1804                 .procname       = "sync_threshold",
1805                 .maxlen         =
1806                         sizeof(((struct netns_ipvs *)0)->sysctl_sync_threshold),
1807                 .mode           = 0644,
1808                 .proc_handler   = proc_do_sync_threshold,
1809         },
1810         {
1811                 .procname       = "sync_refresh_period",
1812                 .maxlen         = sizeof(int),
1813                 .mode           = 0644,
1814                 .proc_handler   = proc_dointvec_jiffies,
1815         },
1816         {
1817                 .procname       = "sync_retries",
1818                 .maxlen         = sizeof(int),
1819                 .mode           = 0644,
1820                 .proc_handler   = proc_dointvec_minmax,
1821                 .extra1         = &zero,
1822                 .extra2         = &three,
1823         },
1824         {
1825                 .procname       = "nat_icmp_send",
1826                 .maxlen         = sizeof(int),
1827                 .mode           = 0644,
1828                 .proc_handler   = proc_dointvec,
1829         },
1830         {
1831                 .procname       = "pmtu_disc",
1832                 .maxlen         = sizeof(int),
1833                 .mode           = 0644,
1834                 .proc_handler   = proc_dointvec,
1835         },
1836         {
1837                 .procname       = "backup_only",
1838                 .maxlen         = sizeof(int),
1839                 .mode           = 0644,
1840                 .proc_handler   = proc_dointvec,
1841         },
1842 #ifdef CONFIG_IP_VS_DEBUG
1843         {
1844                 .procname       = "debug_level",
1845                 .data           = &sysctl_ip_vs_debug_level,
1846                 .maxlen         = sizeof(int),
1847                 .mode           = 0644,
1848                 .proc_handler   = proc_dointvec,
1849         },
1850 #endif
1851 #if 0
1852         {
1853                 .procname       = "timeout_established",
1854                 .data   = &vs_timeout_table_dos.timeout[IP_VS_S_ESTABLISHED],
1855                 .maxlen         = sizeof(int),
1856                 .mode           = 0644,
1857                 .proc_handler   = proc_dointvec_jiffies,
1858         },
1859         {
1860                 .procname       = "timeout_synsent",
1861                 .data   = &vs_timeout_table_dos.timeout[IP_VS_S_SYN_SENT],
1862                 .maxlen         = sizeof(int),
1863                 .mode           = 0644,
1864                 .proc_handler   = proc_dointvec_jiffies,
1865         },
1866         {
1867                 .procname       = "timeout_synrecv",
1868                 .data   = &vs_timeout_table_dos.timeout[IP_VS_S_SYN_RECV],
1869                 .maxlen         = sizeof(int),
1870                 .mode           = 0644,
1871                 .proc_handler   = proc_dointvec_jiffies,
1872         },
1873         {
1874                 .procname       = "timeout_finwait",
1875                 .data   = &vs_timeout_table_dos.timeout[IP_VS_S_FIN_WAIT],
1876                 .maxlen         = sizeof(int),
1877                 .mode           = 0644,
1878                 .proc_handler   = proc_dointvec_jiffies,
1879         },
1880         {
1881                 .procname       = "timeout_timewait",
1882                 .data   = &vs_timeout_table_dos.timeout[IP_VS_S_TIME_WAIT],
1883                 .maxlen         = sizeof(int),
1884                 .mode           = 0644,
1885                 .proc_handler   = proc_dointvec_jiffies,
1886         },
1887         {
1888                 .procname       = "timeout_close",
1889                 .data   = &vs_timeout_table_dos.timeout[IP_VS_S_CLOSE],
1890                 .maxlen         = sizeof(int),
1891                 .mode           = 0644,
1892                 .proc_handler   = proc_dointvec_jiffies,
1893         },
1894         {
1895                 .procname       = "timeout_closewait",
1896                 .data   = &vs_timeout_table_dos.timeout[IP_VS_S_CLOSE_WAIT],
1897                 .maxlen         = sizeof(int),
1898                 .mode           = 0644,
1899                 .proc_handler   = proc_dointvec_jiffies,
1900         },
1901         {
1902                 .procname       = "timeout_lastack",
1903                 .data   = &vs_timeout_table_dos.timeout[IP_VS_S_LAST_ACK],
1904                 .maxlen         = sizeof(int),
1905                 .mode           = 0644,
1906                 .proc_handler   = proc_dointvec_jiffies,
1907         },
1908         {
1909                 .procname       = "timeout_listen",
1910                 .data   = &vs_timeout_table_dos.timeout[IP_VS_S_LISTEN],
1911                 .maxlen         = sizeof(int),
1912                 .mode           = 0644,
1913                 .proc_handler   = proc_dointvec_jiffies,
1914         },
1915         {
1916                 .procname       = "timeout_synack",
1917                 .data   = &vs_timeout_table_dos.timeout[IP_VS_S_SYNACK],
1918                 .maxlen         = sizeof(int),
1919                 .mode           = 0644,
1920                 .proc_handler   = proc_dointvec_jiffies,
1921         },
1922         {
1923                 .procname       = "timeout_udp",
1924                 .data   = &vs_timeout_table_dos.timeout[IP_VS_S_UDP],
1925                 .maxlen         = sizeof(int),
1926                 .mode           = 0644,
1927                 .proc_handler   = proc_dointvec_jiffies,
1928         },
1929         {
1930                 .procname       = "timeout_icmp",
1931                 .data   = &vs_timeout_table_dos.timeout[IP_VS_S_ICMP],
1932                 .maxlen         = sizeof(int),
1933                 .mode           = 0644,
1934                 .proc_handler   = proc_dointvec_jiffies,
1935         },
1936 #endif
1937         { }
1938 };
1939
1940 #endif
1941
1942 #ifdef CONFIG_PROC_FS
1943
1944 struct ip_vs_iter {
1945         struct seq_net_private p;  /* Do not move this, netns depends upon it*/
1946         struct list_head *table;
1947         int bucket;
1948 };
1949
1950 /*
1951  *      Write the contents of the VS rule table to a PROCfs file.
1952  *      (It is kept just for backward compatibility)
1953  */
1954 static inline const char *ip_vs_fwd_name(unsigned int flags)
1955 {
1956         switch (flags & IP_VS_CONN_F_FWD_MASK) {
1957         case IP_VS_CONN_F_LOCALNODE:
1958                 return "Local";
1959         case IP_VS_CONN_F_TUNNEL:
1960                 return "Tunnel";
1961         case IP_VS_CONN_F_DROUTE:
1962                 return "Route";
1963         default:
1964                 return "Masq";
1965         }
1966 }
1967
1968
1969 /* Get the Nth entry in the two lists */
1970 static struct ip_vs_service *ip_vs_info_array(struct seq_file *seq, loff_t pos)
1971 {
1972         struct net *net = seq_file_net(seq);
1973         struct ip_vs_iter *iter = seq->private;
1974         int idx;
1975         struct ip_vs_service *svc;
1976
1977         /* look in hash by protocol */
1978         for (idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
1979                 list_for_each_entry(svc, &ip_vs_svc_table[idx], s_list) {
1980                         if (net_eq(svc->net, net) && pos-- == 0) {
1981                                 iter->table = ip_vs_svc_table;
1982                                 iter->bucket = idx;
1983                                 return svc;
1984                         }
1985                 }
1986         }
1987
1988         /* keep looking in fwmark */
1989         for (idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
1990                 list_for_each_entry(svc, &ip_vs_svc_fwm_table[idx], f_list) {
1991                         if (net_eq(svc->net, net) && pos-- == 0) {
1992                                 iter->table = ip_vs_svc_fwm_table;
1993                                 iter->bucket = idx;
1994                                 return svc;
1995                         }
1996                 }
1997         }
1998
1999         return NULL;
2000 }
2001
2002 static void *ip_vs_info_seq_start(struct seq_file *seq, loff_t *pos)
2003 __acquires(__ip_vs_svc_lock)
2004 {
2005
2006         read_lock_bh(&__ip_vs_svc_lock);
2007         return *pos ? ip_vs_info_array(seq, *pos - 1) : SEQ_START_TOKEN;
2008 }
2009
2010
2011 static void *ip_vs_info_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2012 {
2013         struct list_head *e;
2014         struct ip_vs_iter *iter;
2015         struct ip_vs_service *svc;
2016
2017         ++*pos;
2018         if (v == SEQ_START_TOKEN)
2019                 return ip_vs_info_array(seq,0);
2020
2021         svc = v;
2022         iter = seq->private;
2023
2024         if (iter->table == ip_vs_svc_table) {
2025                 /* next service in table hashed by protocol */
2026                 if ((e = svc->s_list.next) != &ip_vs_svc_table[iter->bucket])
2027                         return list_entry(e, struct ip_vs_service, s_list);
2028
2029
2030                 while (++iter->bucket < IP_VS_SVC_TAB_SIZE) {
2031                         list_for_each_entry(svc,&ip_vs_svc_table[iter->bucket],
2032                                             s_list) {
2033                                 return svc;
2034                         }
2035                 }
2036
2037                 iter->table = ip_vs_svc_fwm_table;
2038                 iter->bucket = -1;
2039                 goto scan_fwmark;
2040         }
2041
2042         /* next service in hashed by fwmark */
2043         if ((e = svc->f_list.next) != &ip_vs_svc_fwm_table[iter->bucket])
2044                 return list_entry(e, struct ip_vs_service, f_list);
2045
2046  scan_fwmark:
2047         while (++iter->bucket < IP_VS_SVC_TAB_SIZE) {
2048                 list_for_each_entry(svc, &ip_vs_svc_fwm_table[iter->bucket],
2049                                     f_list)
2050                         return svc;
2051         }
2052
2053         return NULL;
2054 }
2055
2056 static void ip_vs_info_seq_stop(struct seq_file *seq, void *v)
2057 __releases(__ip_vs_svc_lock)
2058 {
2059         read_unlock_bh(&__ip_vs_svc_lock);
2060 }
2061
2062
2063 static int ip_vs_info_seq_show(struct seq_file *seq, void *v)
2064 {
2065         if (v == SEQ_START_TOKEN) {
2066                 seq_printf(seq,
2067                         "IP Virtual Server version %d.%d.%d (size=%d)\n",
2068                         NVERSION(IP_VS_VERSION_CODE), ip_vs_conn_tab_size);
2069                 seq_puts(seq,
2070                          "Prot LocalAddress:Port Scheduler Flags\n");
2071                 seq_puts(seq,
2072                          "  -> RemoteAddress:Port Forward Weight ActiveConn InActConn\n");
2073         } else {
2074                 const struct ip_vs_service *svc = v;
2075                 const struct ip_vs_iter *iter = seq->private;
2076                 const struct ip_vs_dest *dest;
2077
2078                 if (iter->table == ip_vs_svc_table) {
2079 #ifdef CONFIG_IP_VS_IPV6
2080                         if (svc->af == AF_INET6)
2081                                 seq_printf(seq, "%s  [%pI6]:%04X %s ",
2082                                            ip_vs_proto_name(svc->protocol),
2083                                            &svc->addr.in6,
2084                                            ntohs(svc->port),
2085                                            svc->scheduler->name);
2086                         else
2087 #endif
2088                                 seq_printf(seq, "%s  %08X:%04X %s %s ",
2089                                            ip_vs_proto_name(svc->protocol),
2090                                            ntohl(svc->addr.ip),
2091                                            ntohs(svc->port),
2092                                            svc->scheduler->name,
2093                                            (svc->flags & IP_VS_SVC_F_ONEPACKET)?"ops ":"");
2094                 } else {
2095                         seq_printf(seq, "FWM  %08X %s %s",
2096                                    svc->fwmark, svc->scheduler->name,
2097                                    (svc->flags & IP_VS_SVC_F_ONEPACKET)?"ops ":"");
2098                 }
2099
2100                 if (svc->flags & IP_VS_SVC_F_PERSISTENT)
2101                         seq_printf(seq, "persistent %d %08X\n",
2102                                 svc->timeout,
2103                                 ntohl(svc->netmask));
2104                 else
2105                         seq_putc(seq, '\n');
2106
2107                 list_for_each_entry(dest, &svc->destinations, n_list) {
2108 #ifdef CONFIG_IP_VS_IPV6
2109                         if (dest->af == AF_INET6)
2110                                 seq_printf(seq,
2111                                            "  -> [%pI6]:%04X"
2112                                            "      %-7s %-6d %-10d %-10d\n",
2113                                            &dest->addr.in6,
2114                                            ntohs(dest->port),
2115                                            ip_vs_fwd_name(atomic_read(&dest->conn_flags)),
2116                                            atomic_read(&dest->weight),
2117                                            atomic_read(&dest->activeconns),
2118                                            atomic_read(&dest->inactconns));
2119                         else
2120 #endif
2121                                 seq_printf(seq,
2122                                            "  -> %08X:%04X      "
2123                                            "%-7s %-6d %-10d %-10d\n",
2124                                            ntohl(dest->addr.ip),
2125                                            ntohs(dest->port),
2126                                            ip_vs_fwd_name(atomic_read(&dest->conn_flags)),
2127                                            atomic_read(&dest->weight),
2128                                            atomic_read(&dest->activeconns),
2129                                            atomic_read(&dest->inactconns));
2130
2131                 }
2132         }
2133         return 0;
2134 }
2135
2136 static const struct seq_operations ip_vs_info_seq_ops = {
2137         .start = ip_vs_info_seq_start,
2138         .next  = ip_vs_info_seq_next,
2139         .stop  = ip_vs_info_seq_stop,
2140         .show  = ip_vs_info_seq_show,
2141 };
2142
2143 static int ip_vs_info_open(struct inode *inode, struct file *file)
2144 {
2145         return seq_open_net(inode, file, &ip_vs_info_seq_ops,
2146                         sizeof(struct ip_vs_iter));
2147 }
2148
2149 static const struct file_operations ip_vs_info_fops = {
2150         .owner   = THIS_MODULE,
2151         .open    = ip_vs_info_open,
2152         .read    = seq_read,
2153         .llseek  = seq_lseek,
2154         .release = seq_release_net,
2155 };
2156
2157 static int ip_vs_stats_show(struct seq_file *seq, void *v)
2158 {
2159         struct net *net = seq_file_single_net(seq);
2160         struct ip_vs_stats_user show;
2161
2162 /*               01234567 01234567 01234567 0123456701234567 0123456701234567 */
2163         seq_puts(seq,
2164                  "   Total Incoming Outgoing         Incoming         Outgoing\n");
2165         seq_printf(seq,
2166                    "   Conns  Packets  Packets            Bytes            Bytes\n");
2167
2168         ip_vs_copy_stats(&show, &net_ipvs(net)->tot_stats);
2169         seq_printf(seq, "%8X %8X %8X %16LX %16LX\n\n", show.conns,
2170                    show.inpkts, show.outpkts,
2171                    (unsigned long long) show.inbytes,
2172                    (unsigned long long) show.outbytes);
2173
2174 /*                 01234567 01234567 01234567 0123456701234567 0123456701234567 */
2175         seq_puts(seq,
2176                    " Conns/s   Pkts/s   Pkts/s          Bytes/s          Bytes/s\n");
2177         seq_printf(seq, "%8X %8X %8X %16X %16X\n",
2178                         show.cps, show.inpps, show.outpps,
2179                         show.inbps, show.outbps);
2180
2181         return 0;
2182 }
2183
2184 static int ip_vs_stats_seq_open(struct inode *inode, struct file *file)
2185 {
2186         return single_open_net(inode, file, ip_vs_stats_show);
2187 }
2188
2189 static const struct file_operations ip_vs_stats_fops = {
2190         .owner = THIS_MODULE,
2191         .open = ip_vs_stats_seq_open,
2192         .read = seq_read,
2193         .llseek = seq_lseek,
2194         .release = single_release_net,
2195 };
2196
2197 static int ip_vs_stats_percpu_show(struct seq_file *seq, void *v)
2198 {
2199         struct net *net = seq_file_single_net(seq);
2200         struct ip_vs_stats *tot_stats = &net_ipvs(net)->tot_stats;
2201         struct ip_vs_cpu_stats *cpustats = tot_stats->cpustats;
2202         struct ip_vs_stats_user rates;
2203         int i;
2204
2205 /*               01234567 01234567 01234567 0123456701234567 0123456701234567 */
2206         seq_puts(seq,
2207                  "       Total Incoming Outgoing         Incoming         Outgoing\n");
2208         seq_printf(seq,
2209                    "CPU    Conns  Packets  Packets            Bytes            Bytes\n");
2210
2211         for_each_possible_cpu(i) {
2212                 struct ip_vs_cpu_stats *u = per_cpu_ptr(cpustats, i);
2213                 unsigned int start;
2214                 __u64 inbytes, outbytes;
2215
2216                 do {
2217                         start = u64_stats_fetch_begin_bh(&u->syncp);
2218                         inbytes = u->ustats.inbytes;
2219                         outbytes = u->ustats.outbytes;
2220                 } while (u64_stats_fetch_retry_bh(&u->syncp, start));
2221
2222                 seq_printf(seq, "%3X %8X %8X %8X %16LX %16LX\n",
2223                            i, u->ustats.conns, u->ustats.inpkts,
2224                            u->ustats.outpkts, (__u64)inbytes,
2225                            (__u64)outbytes);
2226         }
2227
2228         spin_lock_bh(&tot_stats->lock);
2229
2230         seq_printf(seq, "  ~ %8X %8X %8X %16LX %16LX\n\n",
2231                    tot_stats->ustats.conns, tot_stats->ustats.inpkts,
2232                    tot_stats->ustats.outpkts,
2233                    (unsigned long long) tot_stats->ustats.inbytes,
2234                    (unsigned long long) tot_stats->ustats.outbytes);
2235
2236         ip_vs_read_estimator(&rates, tot_stats);
2237
2238         spin_unlock_bh(&tot_stats->lock);
2239
2240 /*                 01234567 01234567 01234567 0123456701234567 0123456701234567 */
2241         seq_puts(seq,
2242                    "     Conns/s   Pkts/s   Pkts/s          Bytes/s          Bytes/s\n");
2243         seq_printf(seq, "    %8X %8X %8X %16X %16X\n",
2244                         rates.cps,
2245                         rates.inpps,
2246                         rates.outpps,
2247                         rates.inbps,
2248                         rates.outbps);
2249
2250         return 0;
2251 }
2252
2253 static int ip_vs_stats_percpu_seq_open(struct inode *inode, struct file *file)
2254 {
2255         return single_open_net(inode, file, ip_vs_stats_percpu_show);
2256 }
2257
2258 static const struct file_operations ip_vs_stats_percpu_fops = {
2259         .owner = THIS_MODULE,
2260         .open = ip_vs_stats_percpu_seq_open,
2261         .read = seq_read,
2262         .llseek = seq_lseek,
2263         .release = single_release_net,
2264 };
2265 #endif
2266
2267 /*
2268  *      Set timeout values for tcp tcpfin udp in the timeout_table.
2269  */
2270 static int ip_vs_set_timeout(struct net *net, struct ip_vs_timeout_user *u)
2271 {
2272 #if defined(CONFIG_IP_VS_PROTO_TCP) || defined(CONFIG_IP_VS_PROTO_UDP)
2273         struct ip_vs_proto_data *pd;
2274 #endif
2275
2276         IP_VS_DBG(2, "Setting timeout tcp:%d tcpfin:%d udp:%d\n",
2277                   u->tcp_timeout,
2278                   u->tcp_fin_timeout,
2279                   u->udp_timeout);
2280
2281 #ifdef CONFIG_IP_VS_PROTO_TCP
2282         if (u->tcp_timeout) {
2283                 pd = ip_vs_proto_data_get(net, IPPROTO_TCP);
2284                 pd->timeout_table[IP_VS_TCP_S_ESTABLISHED]
2285                         = u->tcp_timeout * HZ;
2286         }
2287
2288         if (u->tcp_fin_timeout) {
2289                 pd = ip_vs_proto_data_get(net, IPPROTO_TCP);
2290                 pd->timeout_table[IP_VS_TCP_S_FIN_WAIT]
2291                         = u->tcp_fin_timeout * HZ;
2292         }
2293 #endif
2294
2295 #ifdef CONFIG_IP_VS_PROTO_UDP
2296         if (u->udp_timeout) {
2297                 pd = ip_vs_proto_data_get(net, IPPROTO_UDP);
2298                 pd->timeout_table[IP_VS_UDP_S_NORMAL]
2299                         = u->udp_timeout * HZ;
2300         }
2301 #endif
2302         return 0;
2303 }
2304
2305
2306 #define SET_CMDID(cmd)          (cmd - IP_VS_BASE_CTL)
2307 #define SERVICE_ARG_LEN         (sizeof(struct ip_vs_service_user))
2308 #define SVCDEST_ARG_LEN         (sizeof(struct ip_vs_service_user) +    \
2309                                  sizeof(struct ip_vs_dest_user))
2310 #define TIMEOUT_ARG_LEN         (sizeof(struct ip_vs_timeout_user))
2311 #define DAEMON_ARG_LEN          (sizeof(struct ip_vs_daemon_user))
2312 #define MAX_ARG_LEN             SVCDEST_ARG_LEN
2313
2314 static const unsigned char set_arglen[SET_CMDID(IP_VS_SO_SET_MAX)+1] = {
2315         [SET_CMDID(IP_VS_SO_SET_ADD)]           = SERVICE_ARG_LEN,
2316         [SET_CMDID(IP_VS_SO_SET_EDIT)]          = SERVICE_ARG_LEN,
2317         [SET_CMDID(IP_VS_SO_SET_DEL)]           = SERVICE_ARG_LEN,
2318         [SET_CMDID(IP_VS_SO_SET_FLUSH)]         = 0,
2319         [SET_CMDID(IP_VS_SO_SET_ADDDEST)]       = SVCDEST_ARG_LEN,
2320         [SET_CMDID(IP_VS_SO_SET_DELDEST)]       = SVCDEST_ARG_LEN,
2321         [SET_CMDID(IP_VS_SO_SET_EDITDEST)]      = SVCDEST_ARG_LEN,
2322         [SET_CMDID(IP_VS_SO_SET_TIMEOUT)]       = TIMEOUT_ARG_LEN,
2323         [SET_CMDID(IP_VS_SO_SET_STARTDAEMON)]   = DAEMON_ARG_LEN,
2324         [SET_CMDID(IP_VS_SO_SET_STOPDAEMON)]    = DAEMON_ARG_LEN,
2325         [SET_CMDID(IP_VS_SO_SET_ZERO)]          = SERVICE_ARG_LEN,
2326 };
2327
2328 static void ip_vs_copy_usvc_compat(struct ip_vs_service_user_kern *usvc,
2329                                   struct ip_vs_service_user *usvc_compat)
2330 {
2331         memset(usvc, 0, sizeof(*usvc));
2332
2333         usvc->af                = AF_INET;
2334         usvc->protocol          = usvc_compat->protocol;
2335         usvc->addr.ip           = usvc_compat->addr;
2336         usvc->port              = usvc_compat->port;
2337         usvc->fwmark            = usvc_compat->fwmark;
2338
2339         /* Deep copy of sched_name is not needed here */
2340         usvc->sched_name        = usvc_compat->sched_name;
2341
2342         usvc->flags             = usvc_compat->flags;
2343         usvc->timeout           = usvc_compat->timeout;
2344         usvc->netmask           = usvc_compat->netmask;
2345 }
2346
2347 static void ip_vs_copy_udest_compat(struct ip_vs_dest_user_kern *udest,
2348                                    struct ip_vs_dest_user *udest_compat)
2349 {
2350         memset(udest, 0, sizeof(*udest));
2351
2352         udest->addr.ip          = udest_compat->addr;
2353         udest->port             = udest_compat->port;
2354         udest->conn_flags       = udest_compat->conn_flags;
2355         udest->weight           = udest_compat->weight;
2356         udest->u_threshold      = udest_compat->u_threshold;
2357         udest->l_threshold      = udest_compat->l_threshold;
2358 }
2359
2360 static int
2361 do_ip_vs_set_ctl(struct sock *sk, int cmd, void __user *user, unsigned int len)
2362 {
2363         struct net *net = sock_net(sk);
2364         int ret;
2365         unsigned char arg[MAX_ARG_LEN];
2366         struct ip_vs_service_user *usvc_compat;
2367         struct ip_vs_service_user_kern usvc;
2368         struct ip_vs_service *svc;
2369         struct ip_vs_dest_user *udest_compat;
2370         struct ip_vs_dest_user_kern udest;
2371         struct netns_ipvs *ipvs = net_ipvs(net);
2372
2373         if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
2374                 return -EPERM;
2375
2376         if (cmd < IP_VS_BASE_CTL || cmd > IP_VS_SO_SET_MAX)
2377                 return -EINVAL;
2378         if (len < 0 || len >  MAX_ARG_LEN)
2379                 return -EINVAL;
2380         if (len != set_arglen[SET_CMDID(cmd)]) {
2381                 pr_err("set_ctl: len %u != %u\n",
2382                        len, set_arglen[SET_CMDID(cmd)]);
2383                 return -EINVAL;
2384         }
2385
2386         if (copy_from_user(arg, user, len) != 0)
2387                 return -EFAULT;
2388
2389         /* increase the module use count */
2390         ip_vs_use_count_inc();
2391
2392         /* Handle daemons since they have another lock */
2393         if (cmd == IP_VS_SO_SET_STARTDAEMON ||
2394             cmd == IP_VS_SO_SET_STOPDAEMON) {
2395                 struct ip_vs_daemon_user *dm = (struct ip_vs_daemon_user *)arg;
2396
2397                 if (mutex_lock_interruptible(&ipvs->sync_mutex)) {
2398                         ret = -ERESTARTSYS;
2399                         goto out_dec;
2400                 }
2401                 if (cmd == IP_VS_SO_SET_STARTDAEMON)
2402                         ret = start_sync_thread(net, dm->state, dm->mcast_ifn,
2403                                                 dm->syncid);
2404                 else
2405                         ret = stop_sync_thread(net, dm->state);
2406                 mutex_unlock(&ipvs->sync_mutex);
2407                 goto out_dec;
2408         }
2409
2410         if (mutex_lock_interruptible(&__ip_vs_mutex)) {
2411                 ret = -ERESTARTSYS;
2412                 goto out_dec;
2413         }
2414
2415         if (cmd == IP_VS_SO_SET_FLUSH) {
2416                 /* Flush the virtual service */
2417                 ret = ip_vs_flush(net, false);
2418                 goto out_unlock;
2419         } else if (cmd == IP_VS_SO_SET_TIMEOUT) {
2420                 /* Set timeout values for (tcp tcpfin udp) */
2421                 ret = ip_vs_set_timeout(net, (struct ip_vs_timeout_user *)arg);
2422                 goto out_unlock;
2423         }
2424
2425         usvc_compat = (struct ip_vs_service_user *)arg;
2426         udest_compat = (struct ip_vs_dest_user *)(usvc_compat + 1);
2427
2428         /* We only use the new structs internally, so copy userspace compat
2429          * structs to extended internal versions */
2430         ip_vs_copy_usvc_compat(&usvc, usvc_compat);
2431         ip_vs_copy_udest_compat(&udest, udest_compat);
2432
2433         if (cmd == IP_VS_SO_SET_ZERO) {
2434                 /* if no service address is set, zero counters in all */
2435                 if (!usvc.fwmark && !usvc.addr.ip && !usvc.port) {
2436                         ret = ip_vs_zero_all(net);
2437                         goto out_unlock;
2438                 }
2439         }
2440
2441         /* Check for valid protocol: TCP or UDP or SCTP, even for fwmark!=0 */
2442         if (usvc.protocol != IPPROTO_TCP && usvc.protocol != IPPROTO_UDP &&
2443             usvc.protocol != IPPROTO_SCTP) {
2444                 pr_err("set_ctl: invalid protocol: %d %pI4:%d %s\n",
2445                        usvc.protocol, &usvc.addr.ip,
2446                        ntohs(usvc.port), usvc.sched_name);
2447                 ret = -EFAULT;
2448                 goto out_unlock;
2449         }
2450
2451         /* Lookup the exact service by <protocol, addr, port> or fwmark */
2452         if (usvc.fwmark == 0)
2453                 svc = __ip_vs_service_find(net, usvc.af, usvc.protocol,
2454                                            &usvc.addr, usvc.port);
2455         else
2456                 svc = __ip_vs_svc_fwm_find(net, usvc.af, usvc.fwmark);
2457
2458         if (cmd != IP_VS_SO_SET_ADD
2459             && (svc == NULL || svc->protocol != usvc.protocol)) {
2460                 ret = -ESRCH;
2461                 goto out_unlock;
2462         }
2463
2464         switch (cmd) {
2465         case IP_VS_SO_SET_ADD:
2466                 if (svc != NULL)
2467                         ret = -EEXIST;
2468                 else
2469                         ret = ip_vs_add_service(net, &usvc, &svc);
2470                 break;
2471         case IP_VS_SO_SET_EDIT:
2472                 ret = ip_vs_edit_service(svc, &usvc);
2473                 break;
2474         case IP_VS_SO_SET_DEL:
2475                 ret = ip_vs_del_service(svc);
2476                 if (!ret)
2477                         goto out_unlock;
2478                 break;
2479         case IP_VS_SO_SET_ZERO:
2480                 ret = ip_vs_zero_service(svc);
2481                 break;
2482         case IP_VS_SO_SET_ADDDEST:
2483                 ret = ip_vs_add_dest(svc, &udest);
2484                 break;
2485         case IP_VS_SO_SET_EDITDEST:
2486                 ret = ip_vs_edit_dest(svc, &udest);
2487                 break;
2488         case IP_VS_SO_SET_DELDEST:
2489                 ret = ip_vs_del_dest(svc, &udest);
2490                 break;
2491         default:
2492                 ret = -EINVAL;
2493         }
2494
2495   out_unlock:
2496         mutex_unlock(&__ip_vs_mutex);
2497   out_dec:
2498         /* decrease the module use count */
2499         ip_vs_use_count_dec();
2500
2501         return ret;
2502 }
2503
2504
2505 static void
2506 ip_vs_copy_service(struct ip_vs_service_entry *dst, struct ip_vs_service *src)
2507 {
2508         dst->protocol = src->protocol;
2509         dst->addr = src->addr.ip;
2510         dst->port = src->port;
2511         dst->fwmark = src->fwmark;
2512         strlcpy(dst->sched_name, src->scheduler->name, sizeof(dst->sched_name));
2513         dst->flags = src->flags;
2514         dst->timeout = src->timeout / HZ;
2515         dst->netmask = src->netmask;
2516         dst->num_dests = src->num_dests;
2517         ip_vs_copy_stats(&dst->stats, &src->stats);
2518 }
2519
2520 static inline int
2521 __ip_vs_get_service_entries(struct net *net,
2522                             const struct ip_vs_get_services *get,
2523                             struct ip_vs_get_services __user *uptr)
2524 {
2525         int idx, count=0;
2526         struct ip_vs_service *svc;
2527         struct ip_vs_service_entry entry;
2528         int ret = 0;
2529
2530         for (idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
2531                 list_for_each_entry(svc, &ip_vs_svc_table[idx], s_list) {
2532                         /* Only expose IPv4 entries to old interface */
2533                         if (svc->af != AF_INET || !net_eq(svc->net, net))
2534                                 continue;
2535
2536                         if (count >= get->num_services)
2537                                 goto out;
2538                         memset(&entry, 0, sizeof(entry));
2539                         ip_vs_copy_service(&entry, svc);
2540                         if (copy_to_user(&uptr->entrytable[count],
2541                                          &entry, sizeof(entry))) {
2542                                 ret = -EFAULT;
2543                                 goto out;
2544                         }
2545                         count++;
2546                 }
2547         }
2548
2549         for (idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
2550                 list_for_each_entry(svc, &ip_vs_svc_fwm_table[idx], f_list) {
2551                         /* Only expose IPv4 entries to old interface */
2552                         if (svc->af != AF_INET || !net_eq(svc->net, net))
2553                                 continue;
2554
2555                         if (count >= get->num_services)
2556                                 goto out;
2557                         memset(&entry, 0, sizeof(entry));
2558                         ip_vs_copy_service(&entry, svc);
2559                         if (copy_to_user(&uptr->entrytable[count],
2560                                          &entry, sizeof(entry))) {
2561                                 ret = -EFAULT;
2562                                 goto out;
2563                         }
2564                         count++;
2565                 }
2566         }
2567 out:
2568         return ret;
2569 }
2570
2571 static inline int
2572 __ip_vs_get_dest_entries(struct net *net, const struct ip_vs_get_dests *get,
2573                          struct ip_vs_get_dests __user *uptr)
2574 {
2575         struct ip_vs_service *svc;
2576         union nf_inet_addr addr = { .ip = get->addr };
2577         int ret = 0;
2578
2579         if (get->fwmark)
2580                 svc = __ip_vs_svc_fwm_find(net, AF_INET, get->fwmark);
2581         else
2582                 svc = __ip_vs_service_find(net, AF_INET, get->protocol, &addr,
2583                                            get->port);
2584
2585         if (svc) {
2586                 int count = 0;
2587                 struct ip_vs_dest *dest;
2588                 struct ip_vs_dest_entry entry;
2589
2590                 list_for_each_entry(dest, &svc->destinations, n_list) {
2591                         if (count >= get->num_dests)
2592                                 break;
2593
2594                         entry.addr = dest->addr.ip;
2595                         entry.port = dest->port;
2596                         entry.conn_flags = atomic_read(&dest->conn_flags);
2597                         entry.weight = atomic_read(&dest->weight);
2598                         entry.u_threshold = dest->u_threshold;
2599                         entry.l_threshold = dest->l_threshold;
2600                         entry.activeconns = atomic_read(&dest->activeconns);
2601                         entry.inactconns = atomic_read(&dest->inactconns);
2602                         entry.persistconns = atomic_read(&dest->persistconns);
2603                         ip_vs_copy_stats(&entry.stats, &dest->stats);
2604                         if (copy_to_user(&uptr->entrytable[count],
2605                                          &entry, sizeof(entry))) {
2606                                 ret = -EFAULT;
2607                                 break;
2608                         }
2609                         count++;
2610                 }
2611         } else
2612                 ret = -ESRCH;
2613         return ret;
2614 }
2615
2616 static inline void
2617 __ip_vs_get_timeouts(struct net *net, struct ip_vs_timeout_user *u)
2618 {
2619 #if defined(CONFIG_IP_VS_PROTO_TCP) || defined(CONFIG_IP_VS_PROTO_UDP)
2620         struct ip_vs_proto_data *pd;
2621 #endif
2622
2623         memset(u, 0, sizeof (*u));
2624
2625 #ifdef CONFIG_IP_VS_PROTO_TCP
2626         pd = ip_vs_proto_data_get(net, IPPROTO_TCP);
2627         u->tcp_timeout = pd->timeout_table[IP_VS_TCP_S_ESTABLISHED] / HZ;
2628         u->tcp_fin_timeout = pd->timeout_table[IP_VS_TCP_S_FIN_WAIT] / HZ;
2629 #endif
2630 #ifdef CONFIG_IP_VS_PROTO_UDP
2631         pd = ip_vs_proto_data_get(net, IPPROTO_UDP);
2632         u->udp_timeout =
2633                         pd->timeout_table[IP_VS_UDP_S_NORMAL] / HZ;
2634 #endif
2635 }
2636
2637
2638 #define GET_CMDID(cmd)          (cmd - IP_VS_BASE_CTL)
2639 #define GET_INFO_ARG_LEN        (sizeof(struct ip_vs_getinfo))
2640 #define GET_SERVICES_ARG_LEN    (sizeof(struct ip_vs_get_services))
2641 #define GET_SERVICE_ARG_LEN     (sizeof(struct ip_vs_service_entry))
2642 #define GET_DESTS_ARG_LEN       (sizeof(struct ip_vs_get_dests))
2643 #define GET_TIMEOUT_ARG_LEN     (sizeof(struct ip_vs_timeout_user))
2644 #define GET_DAEMON_ARG_LEN      (sizeof(struct ip_vs_daemon_user) * 2)
2645
2646 static const unsigned char get_arglen[GET_CMDID(IP_VS_SO_GET_MAX)+1] = {
2647         [GET_CMDID(IP_VS_SO_GET_VERSION)]       = 64,
2648         [GET_CMDID(IP_VS_SO_GET_INFO)]          = GET_INFO_ARG_LEN,
2649         [GET_CMDID(IP_VS_SO_GET_SERVICES)]      = GET_SERVICES_ARG_LEN,
2650         [GET_CMDID(IP_VS_SO_GET_SERVICE)]       = GET_SERVICE_ARG_LEN,
2651         [GET_CMDID(IP_VS_SO_GET_DESTS)]         = GET_DESTS_ARG_LEN,
2652         [GET_CMDID(IP_VS_SO_GET_TIMEOUT)]       = GET_TIMEOUT_ARG_LEN,
2653         [GET_CMDID(IP_VS_SO_GET_DAEMON)]        = GET_DAEMON_ARG_LEN,
2654 };
2655
2656 static int
2657 do_ip_vs_get_ctl(struct sock *sk, int cmd, void __user *user, int *len)
2658 {
2659         unsigned char arg[128];
2660         int ret = 0;
2661         unsigned int copylen;
2662         struct net *net = sock_net(sk);
2663         struct netns_ipvs *ipvs = net_ipvs(net);
2664
2665         BUG_ON(!net);
2666         if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
2667                 return -EPERM;
2668
2669         if (cmd < IP_VS_BASE_CTL || cmd > IP_VS_SO_GET_MAX)
2670                 return -EINVAL;
2671
2672         if (*len < get_arglen[GET_CMDID(cmd)]) {
2673                 pr_err("get_ctl: len %u < %u\n",
2674                        *len, get_arglen[GET_CMDID(cmd)]);
2675                 return -EINVAL;
2676         }
2677
2678         copylen = get_arglen[GET_CMDID(cmd)];
2679         if (copylen > 128)
2680                 return -EINVAL;
2681
2682         if (copy_from_user(arg, user, copylen) != 0)
2683                 return -EFAULT;
2684         /*
2685          * Handle daemons first since it has its own locking
2686          */
2687         if (cmd == IP_VS_SO_GET_DAEMON) {
2688                 struct ip_vs_daemon_user d[2];
2689
2690                 memset(&d, 0, sizeof(d));
2691                 if (mutex_lock_interruptible(&ipvs->sync_mutex))
2692                         return -ERESTARTSYS;
2693
2694                 if (ipvs->sync_state & IP_VS_STATE_MASTER) {
2695                         d[0].state = IP_VS_STATE_MASTER;
2696                         strlcpy(d[0].mcast_ifn, ipvs->master_mcast_ifn,
2697                                 sizeof(d[0].mcast_ifn));
2698                         d[0].syncid = ipvs->master_syncid;
2699                 }
2700                 if (ipvs->sync_state & IP_VS_STATE_BACKUP) {
2701                         d[1].state = IP_VS_STATE_BACKUP;
2702                         strlcpy(d[1].mcast_ifn, ipvs->backup_mcast_ifn,
2703                                 sizeof(d[1].mcast_ifn));
2704                         d[1].syncid = ipvs->backup_syncid;
2705                 }
2706                 if (copy_to_user(user, &d, sizeof(d)) != 0)
2707                         ret = -EFAULT;
2708                 mutex_unlock(&ipvs->sync_mutex);
2709                 return ret;
2710         }
2711
2712         if (mutex_lock_interruptible(&__ip_vs_mutex))
2713                 return -ERESTARTSYS;
2714
2715         switch (cmd) {
2716         case IP_VS_SO_GET_VERSION:
2717         {
2718                 char buf[64];
2719
2720                 sprintf(buf, "IP Virtual Server version %d.%d.%d (size=%d)",
2721                         NVERSION(IP_VS_VERSION_CODE), ip_vs_conn_tab_size);
2722                 if (copy_to_user(user, buf, strlen(buf)+1) != 0) {
2723                         ret = -EFAULT;
2724                         goto out;
2725                 }
2726                 *len = strlen(buf)+1;
2727         }
2728         break;
2729
2730         case IP_VS_SO_GET_INFO:
2731         {
2732                 struct ip_vs_getinfo info;
2733                 info.version = IP_VS_VERSION_CODE;
2734                 info.size = ip_vs_conn_tab_size;
2735                 info.num_services = ipvs->num_services;
2736                 if (copy_to_user(user, &info, sizeof(info)) != 0)
2737                         ret = -EFAULT;
2738         }
2739         break;
2740
2741         case IP_VS_SO_GET_SERVICES:
2742         {
2743                 struct ip_vs_get_services *get;
2744                 int size;
2745
2746                 get = (struct ip_vs_get_services *)arg;
2747                 size = sizeof(*get) +
2748                         sizeof(struct ip_vs_service_entry) * get->num_services;
2749                 if (*len != size) {
2750                         pr_err("length: %u != %u\n", *len, size);
2751                         ret = -EINVAL;
2752                         goto out;
2753                 }
2754                 ret = __ip_vs_get_service_entries(net, get, user);
2755         }
2756         break;
2757
2758         case IP_VS_SO_GET_SERVICE:
2759         {
2760                 struct ip_vs_service_entry *entry;
2761                 struct ip_vs_service *svc;
2762                 union nf_inet_addr addr;
2763
2764                 entry = (struct ip_vs_service_entry *)arg;
2765                 addr.ip = entry->addr;
2766                 if (entry->fwmark)
2767                         svc = __ip_vs_svc_fwm_find(net, AF_INET, entry->fwmark);
2768                 else
2769                         svc = __ip_vs_service_find(net, AF_INET,
2770                                                    entry->protocol, &addr,
2771                                                    entry->port);
2772                 if (svc) {
2773                         ip_vs_copy_service(entry, svc);
2774                         if (copy_to_user(user, entry, sizeof(*entry)) != 0)
2775                                 ret = -EFAULT;
2776                 } else
2777                         ret = -ESRCH;
2778         }
2779         break;
2780
2781         case IP_VS_SO_GET_DESTS:
2782         {
2783                 struct ip_vs_get_dests *get;
2784                 int size;
2785
2786                 get = (struct ip_vs_get_dests *)arg;
2787                 size = sizeof(*get) +
2788                         sizeof(struct ip_vs_dest_entry) * get->num_dests;
2789                 if (*len != size) {
2790                         pr_err("length: %u != %u\n", *len, size);
2791                         ret = -EINVAL;
2792                         goto out;
2793                 }
2794                 ret = __ip_vs_get_dest_entries(net, get, user);
2795         }
2796         break;
2797
2798         case IP_VS_SO_GET_TIMEOUT:
2799         {
2800                 struct ip_vs_timeout_user t;
2801
2802                 __ip_vs_get_timeouts(net, &t);
2803                 if (copy_to_user(user, &t, sizeof(t)) != 0)
2804                         ret = -EFAULT;
2805         }
2806         break;
2807
2808         default:
2809                 ret = -EINVAL;
2810         }
2811
2812 out:
2813         mutex_unlock(&__ip_vs_mutex);
2814         return ret;
2815 }
2816
2817
2818 static struct nf_sockopt_ops ip_vs_sockopts = {
2819         .pf             = PF_INET,
2820         .set_optmin     = IP_VS_BASE_CTL,
2821         .set_optmax     = IP_VS_SO_SET_MAX+1,
2822         .set            = do_ip_vs_set_ctl,
2823         .get_optmin     = IP_VS_BASE_CTL,
2824         .get_optmax     = IP_VS_SO_GET_MAX+1,
2825         .get            = do_ip_vs_get_ctl,
2826         .owner          = THIS_MODULE,
2827 };
2828
2829 /*
2830  * Generic Netlink interface
2831  */
2832
2833 /* IPVS genetlink family */
2834 static struct genl_family ip_vs_genl_family = {
2835         .id             = GENL_ID_GENERATE,
2836         .hdrsize        = 0,
2837         .name           = IPVS_GENL_NAME,
2838         .version        = IPVS_GENL_VERSION,
2839         .maxattr        = IPVS_CMD_MAX,
2840         .netnsok        = true,         /* Make ipvsadm to work on netns */
2841 };
2842
2843 /* Policy used for first-level command attributes */
2844 static const struct nla_policy ip_vs_cmd_policy[IPVS_CMD_ATTR_MAX + 1] = {
2845         [IPVS_CMD_ATTR_SERVICE]         = { .type = NLA_NESTED },
2846         [IPVS_CMD_ATTR_DEST]            = { .type = NLA_NESTED },
2847         [IPVS_CMD_ATTR_DAEMON]          = { .type = NLA_NESTED },
2848         [IPVS_CMD_ATTR_TIMEOUT_TCP]     = { .type = NLA_U32 },
2849         [IPVS_CMD_ATTR_TIMEOUT_TCP_FIN] = { .type = NLA_U32 },
2850         [IPVS_CMD_ATTR_TIMEOUT_UDP]     = { .type = NLA_U32 },
2851 };
2852
2853 /* Policy used for attributes in nested attribute IPVS_CMD_ATTR_DAEMON */
2854 static const struct nla_policy ip_vs_daemon_policy[IPVS_DAEMON_ATTR_MAX + 1] = {
2855         [IPVS_DAEMON_ATTR_STATE]        = { .type = NLA_U32 },
2856         [IPVS_DAEMON_ATTR_MCAST_IFN]    = { .type = NLA_NUL_STRING,
2857                                             .len = IP_VS_IFNAME_MAXLEN },
2858         [IPVS_DAEMON_ATTR_SYNC_ID]      = { .type = NLA_U32 },
2859 };
2860
2861 /* Policy used for attributes in nested attribute IPVS_CMD_ATTR_SERVICE */
2862 static const struct nla_policy ip_vs_svc_policy[IPVS_SVC_ATTR_MAX + 1] = {
2863         [IPVS_SVC_ATTR_AF]              = { .type = NLA_U16 },
2864         [IPVS_SVC_ATTR_PROTOCOL]        = { .type = NLA_U16 },
2865         [IPVS_SVC_ATTR_ADDR]            = { .type = NLA_BINARY,
2866                                             .len = sizeof(union nf_inet_addr) },
2867         [IPVS_SVC_ATTR_PORT]            = { .type = NLA_U16 },
2868         [IPVS_SVC_ATTR_FWMARK]          = { .type = NLA_U32 },
2869         [IPVS_SVC_ATTR_SCHED_NAME]      = { .type = NLA_NUL_STRING,
2870                                             .len = IP_VS_SCHEDNAME_MAXLEN },
2871         [IPVS_SVC_ATTR_PE_NAME]         = { .type = NLA_NUL_STRING,
2872                                             .len = IP_VS_PENAME_MAXLEN },
2873         [IPVS_SVC_ATTR_FLAGS]           = { .type = NLA_BINARY,
2874                                             .len = sizeof(struct ip_vs_flags) },
2875         [IPVS_SVC_ATTR_TIMEOUT]         = { .type = NLA_U32 },
2876         [IPVS_SVC_ATTR_NETMASK]         = { .type = NLA_U32 },
2877         [IPVS_SVC_ATTR_STATS]           = { .type = NLA_NESTED },
2878 };
2879
2880 /* Policy used for attributes in nested attribute IPVS_CMD_ATTR_DEST */
2881 static const struct nla_policy ip_vs_dest_policy[IPVS_DEST_ATTR_MAX + 1] = {
2882         [IPVS_DEST_ATTR_ADDR]           = { .type = NLA_BINARY,
2883                                             .len = sizeof(union nf_inet_addr) },
2884         [IPVS_DEST_ATTR_PORT]           = { .type = NLA_U16 },
2885         [IPVS_DEST_ATTR_FWD_METHOD]     = { .type = NLA_U32 },
2886         [IPVS_DEST_ATTR_WEIGHT]         = { .type = NLA_U32 },
2887         [IPVS_DEST_ATTR_U_THRESH]       = { .type = NLA_U32 },
2888         [IPVS_DEST_ATTR_L_THRESH]       = { .type = NLA_U32 },
2889         [IPVS_DEST_ATTR_ACTIVE_CONNS]   = { .type = NLA_U32 },
2890         [IPVS_DEST_ATTR_INACT_CONNS]    = { .type = NLA_U32 },
2891         [IPVS_DEST_ATTR_PERSIST_CONNS]  = { .type = NLA_U32 },
2892         [IPVS_DEST_ATTR_STATS]          = { .type = NLA_NESTED },
2893 };
2894
2895 static int ip_vs_genl_fill_stats(struct sk_buff *skb, int container_type,
2896                                  struct ip_vs_stats *stats)
2897 {
2898         struct ip_vs_stats_user ustats;
2899         struct nlattr *nl_stats = nla_nest_start(skb, container_type);
2900         if (!nl_stats)
2901                 return -EMSGSIZE;
2902
2903         ip_vs_copy_stats(&ustats, stats);
2904
2905         if (nla_put_u32(skb, IPVS_STATS_ATTR_CONNS, ustats.conns) ||
2906             nla_put_u32(skb, IPVS_STATS_ATTR_INPKTS, ustats.inpkts) ||
2907             nla_put_u32(skb, IPVS_STATS_ATTR_OUTPKTS, ustats.outpkts) ||
2908             nla_put_u64(skb, IPVS_STATS_ATTR_INBYTES, ustats.inbytes) ||
2909             nla_put_u64(skb, IPVS_STATS_ATTR_OUTBYTES, ustats.outbytes) ||
2910             nla_put_u32(skb, IPVS_STATS_ATTR_CPS, ustats.cps) ||
2911             nla_put_u32(skb, IPVS_STATS_ATTR_INPPS, ustats.inpps) ||
2912             nla_put_u32(skb, IPVS_STATS_ATTR_OUTPPS, ustats.outpps) ||
2913             nla_put_u32(skb, IPVS_STATS_ATTR_INBPS, ustats.inbps) ||
2914             nla_put_u32(skb, IPVS_STATS_ATTR_OUTBPS, ustats.outbps))
2915                 goto nla_put_failure;
2916         nla_nest_end(skb, nl_stats);
2917
2918         return 0;
2919
2920 nla_put_failure:
2921         nla_nest_cancel(skb, nl_stats);
2922         return -EMSGSIZE;
2923 }
2924
2925 static int ip_vs_genl_fill_service(struct sk_buff *skb,
2926                                    struct ip_vs_service *svc)
2927 {
2928         struct nlattr *nl_service;
2929         struct ip_vs_flags flags = { .flags = svc->flags,
2930                                      .mask = ~0 };
2931
2932         nl_service = nla_nest_start(skb, IPVS_CMD_ATTR_SERVICE);
2933         if (!nl_service)
2934                 return -EMSGSIZE;
2935
2936         if (nla_put_u16(skb, IPVS_SVC_ATTR_AF, svc->af))
2937                 goto nla_put_failure;
2938         if (svc->fwmark) {
2939                 if (nla_put_u32(skb, IPVS_SVC_ATTR_FWMARK, svc->fwmark))
2940                         goto nla_put_failure;
2941         } else {
2942                 if (nla_put_u16(skb, IPVS_SVC_ATTR_PROTOCOL, svc->protocol) ||
2943                     nla_put(skb, IPVS_SVC_ATTR_ADDR, sizeof(svc->addr), &svc->addr) ||
2944                     nla_put_u16(skb, IPVS_SVC_ATTR_PORT, svc->port))
2945                         goto nla_put_failure;
2946         }
2947
2948         if (nla_put_string(skb, IPVS_SVC_ATTR_SCHED_NAME, svc->scheduler->name) ||
2949             (svc->pe &&
2950              nla_put_string(skb, IPVS_SVC_ATTR_PE_NAME, svc->pe->name)) ||
2951             nla_put(skb, IPVS_SVC_ATTR_FLAGS, sizeof(flags), &flags) ||
2952             nla_put_u32(skb, IPVS_SVC_ATTR_TIMEOUT, svc->timeout / HZ) ||
2953             nla_put_u32(skb, IPVS_SVC_ATTR_NETMASK, svc->netmask))
2954                 goto nla_put_failure;
2955         if (ip_vs_genl_fill_stats(skb, IPVS_SVC_ATTR_STATS, &svc->stats))
2956                 goto nla_put_failure;
2957
2958         nla_nest_end(skb, nl_service);
2959
2960         return 0;
2961
2962 nla_put_failure:
2963         nla_nest_cancel(skb, nl_service);
2964         return -EMSGSIZE;
2965 }
2966
2967 static int ip_vs_genl_dump_service(struct sk_buff *skb,
2968                                    struct ip_vs_service *svc,
2969                                    struct netlink_callback *cb)
2970 {
2971         void *hdr;
2972
2973         hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
2974                           &ip_vs_genl_family, NLM_F_MULTI,
2975                           IPVS_CMD_NEW_SERVICE);
2976         if (!hdr)
2977                 return -EMSGSIZE;
2978
2979         if (ip_vs_genl_fill_service(skb, svc) < 0)
2980                 goto nla_put_failure;
2981
2982         return genlmsg_end(skb, hdr);
2983
2984 nla_put_failure:
2985         genlmsg_cancel(skb, hdr);
2986         return -EMSGSIZE;
2987 }
2988
2989 static int ip_vs_genl_dump_services(struct sk_buff *skb,
2990                                     struct netlink_callback *cb)
2991 {
2992         int idx = 0, i;
2993         int start = cb->args[0];
2994         struct ip_vs_service *svc;
2995         struct net *net = skb_sknet(skb);
2996
2997         mutex_lock(&__ip_vs_mutex);
2998         for (i = 0; i < IP_VS_SVC_TAB_SIZE; i++) {
2999                 list_for_each_entry(svc, &ip_vs_svc_table[i], s_list) {
3000                         if (++idx <= start || !net_eq(svc->net, net))
3001                                 continue;
3002                         if (ip_vs_genl_dump_service(skb, svc, cb) < 0) {
3003                                 idx--;
3004                                 goto nla_put_failure;
3005                         }
3006                 }
3007         }
3008
3009         for (i = 0; i < IP_VS_SVC_TAB_SIZE; i++) {
3010                 list_for_each_entry(svc, &ip_vs_svc_fwm_table[i], f_list) {
3011                         if (++idx <= start || !net_eq(svc->net, net))
3012                                 continue;
3013                         if (ip_vs_genl_dump_service(skb, svc, cb) < 0) {
3014                                 idx--;
3015                                 goto nla_put_failure;
3016                         }
3017                 }
3018         }
3019
3020 nla_put_failure:
3021         mutex_unlock(&__ip_vs_mutex);
3022         cb->args[0] = idx;
3023
3024         return skb->len;
3025 }
3026
3027 static int ip_vs_genl_parse_service(struct net *net,
3028                                     struct ip_vs_service_user_kern *usvc,
3029                                     struct nlattr *nla, int full_entry,
3030                                     struct ip_vs_service **ret_svc)
3031 {
3032         struct nlattr *attrs[IPVS_SVC_ATTR_MAX + 1];
3033         struct nlattr *nla_af, *nla_port, *nla_fwmark, *nla_protocol, *nla_addr;
3034         struct ip_vs_service *svc;
3035
3036         /* Parse mandatory identifying service fields first */
3037         if (nla == NULL ||
3038             nla_parse_nested(attrs, IPVS_SVC_ATTR_MAX, nla, ip_vs_svc_policy))
3039                 return -EINVAL;
3040
3041         nla_af          = attrs[IPVS_SVC_ATTR_AF];
3042         nla_protocol    = attrs[IPVS_SVC_ATTR_PROTOCOL];
3043         nla_addr        = attrs[IPVS_SVC_ATTR_ADDR];
3044         nla_port        = attrs[IPVS_SVC_ATTR_PORT];
3045         nla_fwmark      = attrs[IPVS_SVC_ATTR_FWMARK];
3046
3047         if (!(nla_af && (nla_fwmark || (nla_port && nla_protocol && nla_addr))))
3048                 return -EINVAL;
3049
3050         memset(usvc, 0, sizeof(*usvc));
3051
3052         usvc->af = nla_get_u16(nla_af);
3053 #ifdef CONFIG_IP_VS_IPV6
3054         if (usvc->af != AF_INET && usvc->af != AF_INET6)
3055 #else
3056         if (usvc->af != AF_INET)
3057 #endif
3058                 return -EAFNOSUPPORT;
3059
3060         if (nla_fwmark) {
3061                 usvc->protocol = IPPROTO_TCP;
3062                 usvc->fwmark = nla_get_u32(nla_fwmark);
3063         } else {
3064                 usvc->protocol = nla_get_u16(nla_protocol);
3065                 nla_memcpy(&usvc->addr, nla_addr, sizeof(usvc->addr));
3066                 usvc->port = nla_get_u16(nla_port);
3067                 usvc->fwmark = 0;
3068         }
3069
3070         if (usvc->fwmark)
3071                 svc = __ip_vs_svc_fwm_find(net, usvc->af, usvc->fwmark);
3072         else
3073                 svc = __ip_vs_service_find(net, usvc->af, usvc->protocol,
3074                                            &usvc->addr, usvc->port);
3075         *ret_svc = svc;
3076
3077         /* If a full entry was requested, check for the additional fields */
3078         if (full_entry) {
3079                 struct nlattr *nla_sched, *nla_flags, *nla_pe, *nla_timeout,
3080                               *nla_netmask;
3081                 struct ip_vs_flags flags;
3082
3083                 nla_sched = attrs[IPVS_SVC_ATTR_SCHED_NAME];
3084                 nla_pe = attrs[IPVS_SVC_ATTR_PE_NAME];
3085                 nla_flags = attrs[IPVS_SVC_ATTR_FLAGS];
3086                 nla_timeout = attrs[IPVS_SVC_ATTR_TIMEOUT];
3087                 nla_netmask = attrs[IPVS_SVC_ATTR_NETMASK];
3088
3089                 if (!(nla_sched && nla_flags && nla_timeout && nla_netmask))
3090                         return -EINVAL;
3091
3092                 nla_memcpy(&flags, nla_flags, sizeof(flags));
3093
3094                 /* prefill flags from service if it already exists */
3095                 if (svc)
3096                         usvc->flags = svc->flags;
3097
3098                 /* set new flags from userland */
3099                 usvc->flags = (usvc->flags & ~flags.mask) |
3100                               (flags.flags & flags.mask);
3101                 usvc->sched_name = nla_data(nla_sched);
3102                 usvc->pe_name = nla_pe ? nla_data(nla_pe) : NULL;
3103                 usvc->timeout = nla_get_u32(nla_timeout);
3104                 usvc->netmask = nla_get_u32(nla_netmask);
3105         }
3106
3107         return 0;
3108 }
3109
3110 static struct ip_vs_service *ip_vs_genl_find_service(struct net *net,
3111                                                      struct nlattr *nla)
3112 {
3113         struct ip_vs_service_user_kern usvc;
3114         struct ip_vs_service *svc;
3115         int ret;
3116
3117         ret = ip_vs_genl_parse_service(net, &usvc, nla, 0, &svc);
3118         return ret ? ERR_PTR(ret) : svc;
3119 }
3120
3121 static int ip_vs_genl_fill_dest(struct sk_buff *skb, struct ip_vs_dest *dest)
3122 {
3123         struct nlattr *nl_dest;
3124
3125         nl_dest = nla_nest_start(skb, IPVS_CMD_ATTR_DEST);
3126         if (!nl_dest)
3127                 return -EMSGSIZE;
3128
3129         if (nla_put(skb, IPVS_DEST_ATTR_ADDR, sizeof(dest->addr), &dest->addr) ||
3130             nla_put_u16(skb, IPVS_DEST_ATTR_PORT, dest->port) ||
3131             nla_put_u32(skb, IPVS_DEST_ATTR_FWD_METHOD,
3132                         (atomic_read(&dest->conn_flags) &
3133                          IP_VS_CONN_F_FWD_MASK)) ||
3134             nla_put_u32(skb, IPVS_DEST_ATTR_WEIGHT,
3135                         atomic_read(&dest->weight)) ||
3136             nla_put_u32(skb, IPVS_DEST_ATTR_U_THRESH, dest->u_threshold) ||
3137             nla_put_u32(skb, IPVS_DEST_ATTR_L_THRESH, dest->l_threshold) ||
3138             nla_put_u32(skb, IPVS_DEST_ATTR_ACTIVE_CONNS,
3139                         atomic_read(&dest->activeconns)) ||
3140             nla_put_u32(skb, IPVS_DEST_ATTR_INACT_CONNS,
3141                         atomic_read(&dest->inactconns)) ||
3142             nla_put_u32(skb, IPVS_DEST_ATTR_PERSIST_CONNS,
3143                         atomic_read(&dest->persistconns)))
3144                 goto nla_put_failure;
3145         if (ip_vs_genl_fill_stats(skb, IPVS_DEST_ATTR_STATS, &dest->stats))
3146                 goto nla_put_failure;
3147
3148         nla_nest_end(skb, nl_dest);
3149
3150         return 0;
3151
3152 nla_put_failure:
3153         nla_nest_cancel(skb, nl_dest);
3154         return -EMSGSIZE;
3155 }
3156
3157 static int ip_vs_genl_dump_dest(struct sk_buff *skb, struct ip_vs_dest *dest,
3158                                 struct netlink_callback *cb)
3159 {
3160         void *hdr;
3161
3162         hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
3163                           &ip_vs_genl_family, NLM_F_MULTI,
3164                           IPVS_CMD_NEW_DEST);
3165         if (!hdr)
3166                 return -EMSGSIZE;
3167
3168         if (ip_vs_genl_fill_dest(skb, dest) < 0)
3169                 goto nla_put_failure;
3170
3171         return genlmsg_end(skb, hdr);
3172
3173 nla_put_failure:
3174         genlmsg_cancel(skb, hdr);
3175         return -EMSGSIZE;
3176 }
3177
3178 static int ip_vs_genl_dump_dests(struct sk_buff *skb,
3179                                  struct netlink_callback *cb)
3180 {
3181         int idx = 0;
3182         int start = cb->args[0];
3183         struct ip_vs_service *svc;
3184         struct ip_vs_dest *dest;
3185         struct nlattr *attrs[IPVS_CMD_ATTR_MAX + 1];
3186         struct net *net = skb_sknet(skb);
3187
3188         mutex_lock(&__ip_vs_mutex);
3189
3190         /* Try to find the service for which to dump destinations */
3191         if (nlmsg_parse(cb->nlh, GENL_HDRLEN, attrs,
3192                         IPVS_CMD_ATTR_MAX, ip_vs_cmd_policy))
3193                 goto out_err;
3194
3195
3196         svc = ip_vs_genl_find_service(net, attrs[IPVS_CMD_ATTR_SERVICE]);
3197         if (IS_ERR(svc) || svc == NULL)
3198                 goto out_err;
3199
3200         /* Dump the destinations */
3201         list_for_each_entry(dest, &svc->destinations, n_list) {
3202                 if (++idx <= start)
3203                         continue;
3204                 if (ip_vs_genl_dump_dest(skb, dest, cb) < 0) {
3205                         idx--;
3206                         goto nla_put_failure;
3207                 }
3208         }
3209
3210 nla_put_failure:
3211         cb->args[0] = idx;
3212
3213 out_err:
3214         mutex_unlock(&__ip_vs_mutex);
3215
3216         return skb->len;
3217 }
3218
3219 static int ip_vs_genl_parse_dest(struct ip_vs_dest_user_kern *udest,
3220                                  struct nlattr *nla, int full_entry)
3221 {
3222         struct nlattr *attrs[IPVS_DEST_ATTR_MAX + 1];
3223         struct nlattr *nla_addr, *nla_port;
3224
3225         /* Parse mandatory identifying destination fields first */
3226         if (nla == NULL ||
3227             nla_parse_nested(attrs, IPVS_DEST_ATTR_MAX, nla, ip_vs_dest_policy))
3228                 return -EINVAL;
3229
3230         nla_addr        = attrs[IPVS_DEST_ATTR_ADDR];
3231         nla_port        = attrs[IPVS_DEST_ATTR_PORT];
3232
3233         if (!(nla_addr && nla_port))
3234                 return -EINVAL;
3235
3236         memset(udest, 0, sizeof(*udest));
3237
3238         nla_memcpy(&udest->addr, nla_addr, sizeof(udest->addr));
3239         udest->port = nla_get_u16(nla_port);
3240
3241         /* If a full entry was requested, check for the additional fields */
3242         if (full_entry) {
3243                 struct nlattr *nla_fwd, *nla_weight, *nla_u_thresh,
3244                               *nla_l_thresh;
3245
3246                 nla_fwd         = attrs[IPVS_DEST_ATTR_FWD_METHOD];
3247                 nla_weight      = attrs[IPVS_DEST_ATTR_WEIGHT];
3248                 nla_u_thresh    = attrs[IPVS_DEST_ATTR_U_THRESH];
3249                 nla_l_thresh    = attrs[IPVS_DEST_ATTR_L_THRESH];
3250
3251                 if (!(nla_fwd && nla_weight && nla_u_thresh && nla_l_thresh))
3252                         return -EINVAL;
3253
3254                 udest->conn_flags = nla_get_u32(nla_fwd)
3255                                     & IP_VS_CONN_F_FWD_MASK;
3256                 udest->weight = nla_get_u32(nla_weight);
3257                 udest->u_threshold = nla_get_u32(nla_u_thresh);
3258                 udest->l_threshold = nla_get_u32(nla_l_thresh);
3259         }
3260
3261         return 0;
3262 }
3263
3264 static int ip_vs_genl_fill_daemon(struct sk_buff *skb, __be32 state,
3265                                   const char *mcast_ifn, __be32 syncid)
3266 {
3267         struct nlattr *nl_daemon;
3268
3269         nl_daemon = nla_nest_start(skb, IPVS_CMD_ATTR_DAEMON);
3270         if (!nl_daemon)
3271                 return -EMSGSIZE;
3272
3273         if (nla_put_u32(skb, IPVS_DAEMON_ATTR_STATE, state) ||
3274             nla_put_string(skb, IPVS_DAEMON_ATTR_MCAST_IFN, mcast_ifn) ||
3275             nla_put_u32(skb, IPVS_DAEMON_ATTR_SYNC_ID, syncid))
3276                 goto nla_put_failure;
3277         nla_nest_end(skb, nl_daemon);
3278
3279         return 0;
3280
3281 nla_put_failure:
3282         nla_nest_cancel(skb, nl_daemon);
3283         return -EMSGSIZE;
3284 }
3285
3286 static int ip_vs_genl_dump_daemon(struct sk_buff *skb, __be32 state,
3287                                   const char *mcast_ifn, __be32 syncid,
3288                                   struct netlink_callback *cb)
3289 {
3290         void *hdr;
3291         hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
3292                           &ip_vs_genl_family, NLM_F_MULTI,
3293                           IPVS_CMD_NEW_DAEMON);
3294         if (!hdr)
3295                 return -EMSGSIZE;
3296
3297         if (ip_vs_genl_fill_daemon(skb, state, mcast_ifn, syncid))
3298                 goto nla_put_failure;
3299
3300         return genlmsg_end(skb, hdr);
3301
3302 nla_put_failure:
3303         genlmsg_cancel(skb, hdr);
3304         return -EMSGSIZE;
3305 }
3306
3307 static int ip_vs_genl_dump_daemons(struct sk_buff *skb,
3308                                    struct netlink_callback *cb)
3309 {
3310         struct net *net = skb_sknet(skb);
3311         struct netns_ipvs *ipvs = net_ipvs(net);
3312
3313         mutex_lock(&ipvs->sync_mutex);
3314         if ((ipvs->sync_state & IP_VS_STATE_MASTER) && !cb->args[0]) {
3315                 if (ip_vs_genl_dump_daemon(skb, IP_VS_STATE_MASTER,
3316                                            ipvs->master_mcast_ifn,
3317                                            ipvs->master_syncid, cb) < 0)
3318                         goto nla_put_failure;
3319
3320                 cb->args[0] = 1;
3321         }
3322
3323         if ((ipvs->sync_state & IP_VS_STATE_BACKUP) && !cb->args[1]) {
3324                 if (ip_vs_genl_dump_daemon(skb, IP_VS_STATE_BACKUP,
3325                                            ipvs->backup_mcast_ifn,
3326                                            ipvs->backup_syncid, cb) < 0)
3327                         goto nla_put_failure;
3328
3329                 cb->args[1] = 1;
3330         }
3331
3332 nla_put_failure:
3333         mutex_unlock(&ipvs->sync_mutex);
3334
3335         return skb->len;
3336 }
3337
3338 static int ip_vs_genl_new_daemon(struct net *net, struct nlattr **attrs)
3339 {
3340         if (!(attrs[IPVS_DAEMON_ATTR_STATE] &&
3341               attrs[IPVS_DAEMON_ATTR_MCAST_IFN] &&
3342               attrs[IPVS_DAEMON_ATTR_SYNC_ID]))
3343                 return -EINVAL;
3344
3345         return start_sync_thread(net,
3346                                  nla_get_u32(attrs[IPVS_DAEMON_ATTR_STATE]),
3347                                  nla_data(attrs[IPVS_DAEMON_ATTR_MCAST_IFN]),
3348                                  nla_get_u32(attrs[IPVS_DAEMON_ATTR_SYNC_ID]));
3349 }
3350
3351 static int ip_vs_genl_del_daemon(struct net *net, struct nlattr **attrs)
3352 {
3353         if (!attrs[IPVS_DAEMON_ATTR_STATE])
3354                 return -EINVAL;
3355
3356         return stop_sync_thread(net,
3357                                 nla_get_u32(attrs[IPVS_DAEMON_ATTR_STATE]));
3358 }
3359
3360 static int ip_vs_genl_set_config(struct net *net, struct nlattr **attrs)
3361 {
3362         struct ip_vs_timeout_user t;
3363
3364         __ip_vs_get_timeouts(net, &t);
3365
3366         if (attrs[IPVS_CMD_ATTR_TIMEOUT_TCP])
3367                 t.tcp_timeout = nla_get_u32(attrs[IPVS_CMD_ATTR_TIMEOUT_TCP]);
3368
3369         if (attrs[IPVS_CMD_ATTR_TIMEOUT_TCP_FIN])
3370                 t.tcp_fin_timeout =
3371                         nla_get_u32(attrs[IPVS_CMD_ATTR_TIMEOUT_TCP_FIN]);
3372
3373         if (attrs[IPVS_CMD_ATTR_TIMEOUT_UDP])
3374                 t.udp_timeout = nla_get_u32(attrs[IPVS_CMD_ATTR_TIMEOUT_UDP]);
3375
3376         return ip_vs_set_timeout(net, &t);
3377 }
3378
3379 static int ip_vs_genl_set_daemon(struct sk_buff *skb, struct genl_info *info)
3380 {
3381         int ret = 0, cmd;
3382         struct net *net;
3383         struct netns_ipvs *ipvs;
3384
3385         net = skb_sknet(skb);
3386         ipvs = net_ipvs(net);
3387         cmd = info->genlhdr->cmd;
3388
3389         if (cmd == IPVS_CMD_NEW_DAEMON || cmd == IPVS_CMD_DEL_DAEMON) {
3390                 struct nlattr *daemon_attrs[IPVS_DAEMON_ATTR_MAX + 1];
3391
3392                 mutex_lock(&ipvs->sync_mutex);
3393                 if (!info->attrs[IPVS_CMD_ATTR_DAEMON] ||
3394                     nla_parse_nested(daemon_attrs, IPVS_DAEMON_ATTR_MAX,
3395                                      info->attrs[IPVS_CMD_ATTR_DAEMON],
3396                                      ip_vs_daemon_policy)) {
3397                         ret = -EINVAL;
3398                         goto out;
3399                 }
3400
3401                 if (cmd == IPVS_CMD_NEW_DAEMON)
3402                         ret = ip_vs_genl_new_daemon(net, daemon_attrs);
3403                 else
3404                         ret = ip_vs_genl_del_daemon(net, daemon_attrs);
3405 out:
3406                 mutex_unlock(&ipvs->sync_mutex);
3407         }
3408         return ret;
3409 }
3410
3411 static int ip_vs_genl_set_cmd(struct sk_buff *skb, struct genl_info *info)
3412 {
3413         struct ip_vs_service *svc = NULL;
3414         struct ip_vs_service_user_kern usvc;
3415         struct ip_vs_dest_user_kern udest;
3416         int ret = 0, cmd;
3417         int need_full_svc = 0, need_full_dest = 0;
3418         struct net *net;
3419
3420         net = skb_sknet(skb);
3421         cmd = info->genlhdr->cmd;
3422
3423         mutex_lock(&__ip_vs_mutex);
3424
3425         if (cmd == IPVS_CMD_FLUSH) {
3426                 ret = ip_vs_flush(net, false);
3427                 goto out;
3428         } else if (cmd == IPVS_CMD_SET_CONFIG) {
3429                 ret = ip_vs_genl_set_config(net, info->attrs);
3430                 goto out;
3431         } else if (cmd == IPVS_CMD_ZERO &&
3432                    !info->attrs[IPVS_CMD_ATTR_SERVICE]) {
3433                 ret = ip_vs_zero_all(net);
3434                 goto out;
3435         }
3436
3437         /* All following commands require a service argument, so check if we
3438          * received a valid one. We need a full service specification when
3439          * adding / editing a service. Only identifying members otherwise. */
3440         if (cmd == IPVS_CMD_NEW_SERVICE || cmd == IPVS_CMD_SET_SERVICE)
3441                 need_full_svc = 1;
3442
3443         ret = ip_vs_genl_parse_service(net, &usvc,
3444                                        info->attrs[IPVS_CMD_ATTR_SERVICE],
3445                                        need_full_svc, &svc);
3446         if (ret)
3447                 goto out;
3448
3449         /* Unless we're adding a new service, the service must already exist */
3450         if ((cmd != IPVS_CMD_NEW_SERVICE) && (svc == NULL)) {
3451                 ret = -ESRCH;
3452                 goto out;
3453         }
3454
3455         /* Destination commands require a valid destination argument. For
3456          * adding / editing a destination, we need a full destination
3457          * specification. */
3458         if (cmd == IPVS_CMD_NEW_DEST || cmd == IPVS_CMD_SET_DEST ||
3459             cmd == IPVS_CMD_DEL_DEST) {
3460                 if (cmd != IPVS_CMD_DEL_DEST)
3461                         need_full_dest = 1;
3462
3463                 ret = ip_vs_genl_parse_dest(&udest,
3464                                             info->attrs[IPVS_CMD_ATTR_DEST],
3465                                             need_full_dest);
3466                 if (ret)
3467                         goto out;
3468         }
3469
3470         switch (cmd) {
3471         case IPVS_CMD_NEW_SERVICE:
3472                 if (svc == NULL)
3473                         ret = ip_vs_add_service(net, &usvc, &svc);
3474                 else
3475                         ret = -EEXIST;
3476                 break;
3477         case IPVS_CMD_SET_SERVICE:
3478                 ret = ip_vs_edit_service(svc, &usvc);
3479                 break;
3480         case IPVS_CMD_DEL_SERVICE:
3481                 ret = ip_vs_del_service(svc);
3482                 /* do not use svc, it can be freed */
3483                 break;
3484         case IPVS_CMD_NEW_DEST:
3485                 ret = ip_vs_add_dest(svc, &udest);
3486                 break;
3487         case IPVS_CMD_SET_DEST:
3488                 ret = ip_vs_edit_dest(svc, &udest);
3489                 break;
3490         case IPVS_CMD_DEL_DEST:
3491                 ret = ip_vs_del_dest(svc, &udest);
3492                 break;
3493         case IPVS_CMD_ZERO:
3494                 ret = ip_vs_zero_service(svc);
3495                 break;
3496         default:
3497                 ret = -EINVAL;
3498         }
3499
3500 out:
3501         mutex_unlock(&__ip_vs_mutex);
3502
3503         return ret;
3504 }
3505
3506 static int ip_vs_genl_get_cmd(struct sk_buff *skb, struct genl_info *info)
3507 {
3508         struct sk_buff *msg;
3509         void *reply;
3510         int ret, cmd, reply_cmd;
3511         struct net *net;
3512
3513         net = skb_sknet(skb);
3514         cmd = info->genlhdr->cmd;
3515
3516         if (cmd == IPVS_CMD_GET_SERVICE)
3517                 reply_cmd = IPVS_CMD_NEW_SERVICE;
3518         else if (cmd == IPVS_CMD_GET_INFO)
3519                 reply_cmd = IPVS_CMD_SET_INFO;
3520         else if (cmd == IPVS_CMD_GET_CONFIG)
3521                 reply_cmd = IPVS_CMD_SET_CONFIG;
3522         else {
3523                 pr_err("unknown Generic Netlink command\n");
3524                 return -EINVAL;
3525         }
3526
3527         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
3528         if (!msg)
3529                 return -ENOMEM;
3530
3531         mutex_lock(&__ip_vs_mutex);
3532
3533         reply = genlmsg_put_reply(msg, info, &ip_vs_genl_family, 0, reply_cmd);
3534         if (reply == NULL)
3535                 goto nla_put_failure;
3536
3537         switch (cmd) {
3538         case IPVS_CMD_GET_SERVICE:
3539         {
3540                 struct ip_vs_service *svc;
3541
3542                 svc = ip_vs_genl_find_service(net,
3543                                               info->attrs[IPVS_CMD_ATTR_SERVICE]);
3544                 if (IS_ERR(svc)) {
3545                         ret = PTR_ERR(svc);
3546                         goto out_err;
3547                 } else if (svc) {
3548                         ret = ip_vs_genl_fill_service(msg, svc);
3549                         if (ret)
3550                                 goto nla_put_failure;
3551                 } else {
3552                         ret = -ESRCH;
3553                         goto out_err;
3554                 }
3555
3556                 break;
3557         }
3558
3559         case IPVS_CMD_GET_CONFIG:
3560         {
3561                 struct ip_vs_timeout_user t;
3562
3563                 __ip_vs_get_timeouts(net, &t);
3564 #ifdef CONFIG_IP_VS_PROTO_TCP
3565                 if (nla_put_u32(msg, IPVS_CMD_ATTR_TIMEOUT_TCP,
3566                                 t.tcp_timeout) ||
3567                     nla_put_u32(msg, IPVS_CMD_ATTR_TIMEOUT_TCP_FIN,
3568                                 t.tcp_fin_timeout))
3569                         goto nla_put_failure;
3570 #endif
3571 #ifdef CONFIG_IP_VS_PROTO_UDP
3572                 if (nla_put_u32(msg, IPVS_CMD_ATTR_TIMEOUT_UDP, t.udp_timeout))
3573                         goto nla_put_failure;
3574 #endif
3575
3576                 break;
3577         }
3578
3579         case IPVS_CMD_GET_INFO:
3580                 if (nla_put_u32(msg, IPVS_INFO_ATTR_VERSION,
3581                                 IP_VS_VERSION_CODE) ||
3582                     nla_put_u32(msg, IPVS_INFO_ATTR_CONN_TAB_SIZE,
3583                                 ip_vs_conn_tab_size))
3584                         goto nla_put_failure;
3585                 break;
3586         }
3587
3588         genlmsg_end(msg, reply);
3589         ret = genlmsg_reply(msg, info);
3590         goto out;
3591
3592 nla_put_failure:
3593         pr_err("not enough space in Netlink message\n");
3594         ret = -EMSGSIZE;
3595
3596 out_err:
3597         nlmsg_free(msg);
3598 out:
3599         mutex_unlock(&__ip_vs_mutex);
3600
3601         return ret;
3602 }
3603
3604
3605 static struct genl_ops ip_vs_genl_ops[] __read_mostly = {
3606         {
3607                 .cmd    = IPVS_CMD_NEW_SERVICE,
3608                 .flags  = GENL_ADMIN_PERM,
3609                 .policy = ip_vs_cmd_policy,
3610                 .doit   = ip_vs_genl_set_cmd,
3611         },
3612         {
3613                 .cmd    = IPVS_CMD_SET_SERVICE,
3614                 .flags  = GENL_ADMIN_PERM,
3615                 .policy = ip_vs_cmd_policy,
3616                 .doit   = ip_vs_genl_set_cmd,
3617         },
3618         {
3619                 .cmd    = IPVS_CMD_DEL_SERVICE,
3620                 .flags  = GENL_ADMIN_PERM,
3621                 .policy = ip_vs_cmd_policy,
3622                 .doit   = ip_vs_genl_set_cmd,
3623         },
3624         {
3625                 .cmd    = IPVS_CMD_GET_SERVICE,
3626                 .flags  = GENL_ADMIN_PERM,
3627                 .doit   = ip_vs_genl_get_cmd,
3628                 .dumpit = ip_vs_genl_dump_services,
3629                 .policy = ip_vs_cmd_policy,
3630         },
3631         {
3632                 .cmd    = IPVS_CMD_NEW_DEST,
3633                 .flags  = GENL_ADMIN_PERM,
3634                 .policy = ip_vs_cmd_policy,
3635                 .doit   = ip_vs_genl_set_cmd,
3636         },
3637         {
3638                 .cmd    = IPVS_CMD_SET_DEST,
3639                 .flags  = GENL_ADMIN_PERM,
3640                 .policy = ip_vs_cmd_policy,
3641                 .doit   = ip_vs_genl_set_cmd,
3642         },
3643         {
3644                 .cmd    = IPVS_CMD_DEL_DEST,
3645                 .flags  = GENL_ADMIN_PERM,
3646                 .policy = ip_vs_cmd_policy,
3647                 .doit   = ip_vs_genl_set_cmd,
3648         },
3649         {
3650                 .cmd    = IPVS_CMD_GET_DEST,
3651                 .flags  = GENL_ADMIN_PERM,
3652                 .policy = ip_vs_cmd_policy,
3653                 .dumpit = ip_vs_genl_dump_dests,
3654         },
3655         {
3656                 .cmd    = IPVS_CMD_NEW_DAEMON,
3657                 .flags  = GENL_ADMIN_PERM,
3658                 .policy = ip_vs_cmd_policy,
3659                 .doit   = ip_vs_genl_set_daemon,
3660         },
3661         {
3662                 .cmd    = IPVS_CMD_DEL_DAEMON,
3663                 .flags  = GENL_ADMIN_PERM,
3664                 .policy = ip_vs_cmd_policy,
3665                 .doit   = ip_vs_genl_set_daemon,
3666         },
3667         {
3668                 .cmd    = IPVS_CMD_GET_DAEMON,
3669                 .flags  = GENL_ADMIN_PERM,
3670                 .dumpit = ip_vs_genl_dump_daemons,
3671         },
3672         {
3673                 .cmd    = IPVS_CMD_SET_CONFIG,
3674                 .flags  = GENL_ADMIN_PERM,
3675                 .policy = ip_vs_cmd_policy,
3676                 .doit   = ip_vs_genl_set_cmd,
3677         },
3678         {
3679                 .cmd    = IPVS_CMD_GET_CONFIG,
3680                 .flags  = GENL_ADMIN_PERM,
3681                 .doit   = ip_vs_genl_get_cmd,
3682         },
3683         {
3684                 .cmd    = IPVS_CMD_GET_INFO,
3685                 .flags  = GENL_ADMIN_PERM,
3686                 .doit   = ip_vs_genl_get_cmd,
3687         },
3688         {
3689                 .cmd    = IPVS_CMD_ZERO,
3690                 .flags  = GENL_ADMIN_PERM,
3691                 .policy = ip_vs_cmd_policy,
3692                 .doit   = ip_vs_genl_set_cmd,
3693         },
3694         {
3695                 .cmd    = IPVS_CMD_FLUSH,
3696                 .flags  = GENL_ADMIN_PERM,
3697                 .doit   = ip_vs_genl_set_cmd,
3698         },
3699 };
3700
3701 static int __init ip_vs_genl_register(void)
3702 {
3703         return genl_register_family_with_ops(&ip_vs_genl_family,
3704                 ip_vs_genl_ops, ARRAY_SIZE(ip_vs_genl_ops));
3705 }
3706
3707 static void ip_vs_genl_unregister(void)
3708 {
3709         genl_unregister_family(&ip_vs_genl_family);
3710 }
3711
3712 /* End of Generic Netlink interface definitions */
3713
3714 /*
3715  * per netns intit/exit func.
3716  */
3717 #ifdef CONFIG_SYSCTL
3718 static int __net_init ip_vs_control_net_init_sysctl(struct net *net)
3719 {
3720         int idx;
3721         struct netns_ipvs *ipvs = net_ipvs(net);
3722         struct ctl_table *tbl;
3723
3724         atomic_set(&ipvs->dropentry, 0);
3725         spin_lock_init(&ipvs->dropentry_lock);
3726         spin_lock_init(&ipvs->droppacket_lock);
3727         spin_lock_init(&ipvs->securetcp_lock);
3728
3729         if (!net_eq(net, &init_net)) {
3730                 tbl = kmemdup(vs_vars, sizeof(vs_vars), GFP_KERNEL);
3731                 if (tbl == NULL)
3732                         return -ENOMEM;
3733
3734                 /* Don't export sysctls to unprivileged users */
3735                 if (net->user_ns != &init_user_ns)
3736                         tbl[0].procname = NULL;
3737         } else
3738                 tbl = vs_vars;
3739         /* Initialize sysctl defaults */
3740         idx = 0;
3741         ipvs->sysctl_amemthresh = 1024;
3742         tbl[idx++].data = &ipvs->sysctl_amemthresh;
3743         ipvs->sysctl_am_droprate = 10;
3744         tbl[idx++].data = &ipvs->sysctl_am_droprate;
3745         tbl[idx++].data = &ipvs->sysctl_drop_entry;
3746         tbl[idx++].data = &ipvs->sysctl_drop_packet;
3747 #ifdef CONFIG_IP_VS_NFCT
3748         tbl[idx++].data = &ipvs->sysctl_conntrack;
3749 #endif
3750         tbl[idx++].data = &ipvs->sysctl_secure_tcp;
3751         ipvs->sysctl_snat_reroute = 1;
3752         tbl[idx++].data = &ipvs->sysctl_snat_reroute;
3753         ipvs->sysctl_sync_ver = 1;
3754         tbl[idx++].data = &ipvs->sysctl_sync_ver;
3755         ipvs->sysctl_sync_ports = 1;
3756         tbl[idx++].data = &ipvs->sysctl_sync_ports;
3757         ipvs->sysctl_sync_qlen_max = nr_free_buffer_pages() / 32;
3758         tbl[idx++].data = &ipvs->sysctl_sync_qlen_max;
3759         ipvs->sysctl_sync_sock_size = 0;
3760         tbl[idx++].data = &ipvs->sysctl_sync_sock_size;
3761         tbl[idx++].data = &ipvs->sysctl_cache_bypass;
3762         tbl[idx++].data = &ipvs->sysctl_expire_nodest_conn;
3763         tbl[idx++].data = &ipvs->sysctl_expire_quiescent_template;
3764         ipvs->sysctl_sync_threshold[0] = DEFAULT_SYNC_THRESHOLD;
3765         ipvs->sysctl_sync_threshold[1] = DEFAULT_SYNC_PERIOD;
3766         tbl[idx].data = &ipvs->sysctl_sync_threshold;
3767         tbl[idx++].maxlen = sizeof(ipvs->sysctl_sync_threshold);
3768         ipvs->sysctl_sync_refresh_period = DEFAULT_SYNC_REFRESH_PERIOD;
3769         tbl[idx++].data = &ipvs->sysctl_sync_refresh_period;
3770         ipvs->sysctl_sync_retries = clamp_t(int, DEFAULT_SYNC_RETRIES, 0, 3);
3771         tbl[idx++].data = &ipvs->sysctl_sync_retries;
3772         tbl[idx++].data = &ipvs->sysctl_nat_icmp_send;
3773         ipvs->sysctl_pmtu_disc = 1;
3774         tbl[idx++].data = &ipvs->sysctl_pmtu_disc;
3775         tbl[idx++].data = &ipvs->sysctl_backup_only;
3776
3777
3778         ipvs->sysctl_hdr = register_net_sysctl(net, "net/ipv4/vs", tbl);
3779         if (ipvs->sysctl_hdr == NULL) {
3780                 if (!net_eq(net, &init_net))
3781                         kfree(tbl);
3782                 return -ENOMEM;
3783         }
3784         ip_vs_start_estimator(net, &ipvs->tot_stats);
3785         ipvs->sysctl_tbl = tbl;
3786         /* Schedule defense work */
3787         INIT_DELAYED_WORK(&ipvs->defense_work, defense_work_handler);
3788         schedule_delayed_work(&ipvs->defense_work, DEFENSE_TIMER_PERIOD);
3789
3790         return 0;
3791 }
3792
3793 static void __net_exit ip_vs_control_net_cleanup_sysctl(struct net *net)
3794 {
3795         struct netns_ipvs *ipvs = net_ipvs(net);
3796
3797         cancel_delayed_work_sync(&ipvs->defense_work);
3798         cancel_work_sync(&ipvs->defense_work.work);
3799         unregister_net_sysctl_table(ipvs->sysctl_hdr);
3800 }
3801
3802 #else
3803
3804 static int __net_init ip_vs_control_net_init_sysctl(struct net *net) { return 0; }
3805 static void __net_exit ip_vs_control_net_cleanup_sysctl(struct net *net) { }
3806
3807 #endif
3808
3809 static struct notifier_block ip_vs_dst_notifier = {
3810         .notifier_call = ip_vs_dst_event,
3811 };
3812
3813 int __net_init ip_vs_control_net_init(struct net *net)
3814 {
3815         int idx;
3816         struct netns_ipvs *ipvs = net_ipvs(net);
3817
3818         /* Initialize rs_table */
3819         for (idx = 0; idx < IP_VS_RTAB_SIZE; idx++)
3820                 INIT_HLIST_HEAD(&ipvs->rs_table[idx]);
3821
3822         INIT_LIST_HEAD(&ipvs->dest_trash);
3823         spin_lock_init(&ipvs->dest_trash_lock);
3824         setup_timer(&ipvs->dest_trash_timer, ip_vs_dest_trash_expire,
3825                     (unsigned long) net);
3826         atomic_set(&ipvs->ftpsvc_counter, 0);
3827         atomic_set(&ipvs->nullsvc_counter, 0);
3828
3829         /* procfs stats */
3830         ipvs->tot_stats.cpustats = alloc_percpu(struct ip_vs_cpu_stats);
3831         if (!ipvs->tot_stats.cpustats)
3832                 return -ENOMEM;
3833
3834         spin_lock_init(&ipvs->tot_stats.lock);
3835
3836         proc_create("ip_vs", 0, net->proc_net, &ip_vs_info_fops);
3837         proc_create("ip_vs_stats", 0, net->proc_net, &ip_vs_stats_fops);
3838         proc_create("ip_vs_stats_percpu", 0, net->proc_net,
3839                     &ip_vs_stats_percpu_fops);
3840
3841         if (ip_vs_control_net_init_sysctl(net))
3842                 goto err;
3843
3844         return 0;
3845
3846 err:
3847         free_percpu(ipvs->tot_stats.cpustats);
3848         return -ENOMEM;
3849 }
3850
3851 void __net_exit ip_vs_control_net_cleanup(struct net *net)
3852 {
3853         struct netns_ipvs *ipvs = net_ipvs(net);
3854
3855         /* Some dest can be in grace period even before cleanup, we have to
3856          * defer ip_vs_trash_cleanup until ip_vs_dest_wait_readers is called.
3857          */
3858         rcu_barrier();
3859         ip_vs_trash_cleanup(net);
3860         ip_vs_stop_estimator(net, &ipvs->tot_stats);
3861         ip_vs_control_net_cleanup_sysctl(net);
3862         remove_proc_entry("ip_vs_stats_percpu", net->proc_net);
3863         remove_proc_entry("ip_vs_stats", net->proc_net);
3864         remove_proc_entry("ip_vs", net->proc_net);
3865         free_percpu(ipvs->tot_stats.cpustats);
3866 }
3867
3868 int __init ip_vs_register_nl_ioctl(void)
3869 {
3870         int ret;
3871
3872         ret = nf_register_sockopt(&ip_vs_sockopts);
3873         if (ret) {
3874                 pr_err("cannot register sockopt.\n");
3875                 goto err_sock;
3876         }
3877
3878         ret = ip_vs_genl_register();
3879         if (ret) {
3880                 pr_err("cannot register Generic Netlink interface.\n");
3881                 goto err_genl;
3882         }
3883         return 0;
3884
3885 err_genl:
3886         nf_unregister_sockopt(&ip_vs_sockopts);
3887 err_sock:
3888         return ret;
3889 }
3890
3891 void ip_vs_unregister_nl_ioctl(void)
3892 {
3893         ip_vs_genl_unregister();
3894         nf_unregister_sockopt(&ip_vs_sockopts);
3895 }
3896
3897 int __init ip_vs_control_init(void)
3898 {
3899         int idx;
3900         int ret;
3901
3902         EnterFunction(2);
3903
3904         /* Initialize svc_table, ip_vs_svc_fwm_table */
3905         for (idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
3906                 INIT_LIST_HEAD(&ip_vs_svc_table[idx]);
3907                 INIT_LIST_HEAD(&ip_vs_svc_fwm_table[idx]);
3908         }
3909
3910         smp_wmb();      /* Do we really need it now ? */
3911
3912         ret = register_netdevice_notifier(&ip_vs_dst_notifier);
3913         if (ret < 0)
3914                 return ret;
3915
3916         LeaveFunction(2);
3917         return 0;
3918 }
3919
3920
3921 void ip_vs_control_cleanup(void)
3922 {
3923         EnterFunction(2);
3924         unregister_netdevice_notifier(&ip_vs_dst_notifier);
3925         LeaveFunction(2);
3926 }