net/netfilter/ipvs/ip_vs_ctl.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * IPVS         An implementation of the IP virtual server support for the
   4  *              LINUX operating system.  IPVS is now implemented as a module
   5  *              over the NetFilter framework. IPVS can be used to build a
   6  *              high-performance and highly available server based on a
   7  *              cluster of servers.
   8  *
   9  * Authors:     Wensong Zhang <wensong@linuxvirtualserver.org>
  10  *              Peter Kese <peter.kese@ijs.si>
  11  *              Julian Anastasov <ja@ssi.bg>
  12  *
  13  * Changes:
  14  */
  15
  16 #define KMSG_COMPONENT "IPVS"
  17 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  18
  19 #include <linux/module.h>
  20 #include <linux/init.h>
  21 #include <linux/types.h>
  22 #include <linux/capability.h>
  23 #include <linux/fs.h>
  24 #include <linux/sysctl.h>
  25 #include <linux/proc_fs.h>
  26 #include <linux/workqueue.h>
  27 #include <linux/seq_file.h>
  28 #include <linux/slab.h>
  29
  30 #include <linux/netfilter.h>
  31 #include <linux/netfilter_ipv4.h>
  32 #include <linux/mutex.h>
  33
  34 #include <net/net_namespace.h>
  35 #include <linux/nsproxy.h>
  36 #include <net/ip.h>
  37 #ifdef CONFIG_IP_VS_IPV6
  38 #include <net/ipv6.h>
  39 #include <net/ip6_route.h>
  40 #include <net/netfilter/ipv6/nf_defrag_ipv6.h>
  41 #endif
  42 #include <net/route.h>
  43 #include <net/sock.h>
  44 #include <net/genetlink.h>
  45
  46 #include <linux/uaccess.h>
  47
  48 #include <net/ip_vs.h>
  49
  50 MODULE_ALIAS_GENL_FAMILY(IPVS_GENL_NAME);
  51
  52 DEFINE_MUTEX(__ip_vs_mutex); /* Serialize configuration with sockopt/netlink */
  53
  54 /* sysctl variables */
  55
  56 #ifdef CONFIG_IP_VS_DEBUG
  57 static int sysctl_ip_vs_debug_level = 0;
  58
  59 int ip_vs_get_debug_level(void)
  60 {
  61         return sysctl_ip_vs_debug_level;
  62 }
  63 #endif
  64
  65
  66 /*  Protos */
  67 static void __ip_vs_del_service(struct ip_vs_service *svc, bool cleanup);
  68
  69
  70 #ifdef CONFIG_IP_VS_IPV6
  71 /* Taken from rt6_fill_node() in net/ipv6/route.c, is there a better way? */
  72 static bool __ip_vs_addr_is_local_v6(struct net *net,
  73                                      const struct in6_addr *addr)
  74 {
  75         struct flowi6 fl6 = {
  76                 .daddr = *addr,
  77         };
  78         struct dst_entry *dst = ip6_route_output(net, NULL, &fl6);
  79         bool is_local;
  80
  81         is_local = !dst->error && dst->dev && (dst->dev->flags & IFF_LOOPBACK);
  82
  83         dst_release(dst);
  84         return is_local;
  85 }
  86 #endif
  87
  88 #ifdef CONFIG_SYSCTL
  89 /*
  90  *      update_defense_level is called from keventd and from sysctl,
  91  *      so it needs to protect itself from softirqs
  92  */
  93 static void update_defense_level(struct netns_ipvs *ipvs)
  94 {
  95         struct sysinfo i;
  96         int availmem;
  97         int nomem;
  98         int to_change = -1;
  99
 100         /* we only count free and buffered memory (in pages) */
 101         si_meminfo(&i);
 102         availmem = i.freeram + i.bufferram;
 103         /* however in linux 2.5 the i.bufferram is total page cache size,
 104            we need adjust it */
 105         /* si_swapinfo(&i); */
 106         /* availmem = availmem - (i.totalswap - i.freeswap); */
 107
 108         nomem = (availmem < ipvs->sysctl_amemthresh);
 109
 110         local_bh_disable();
 111
 112         /* drop_entry */
 113         spin_lock(&ipvs->dropentry_lock);
 114         switch (ipvs->sysctl_drop_entry) {
 115         case 0:
 116                 atomic_set(&ipvs->dropentry, 0);
 117                 break;
 118         case 1:
 119                 if (nomem) {
 120                         atomic_set(&ipvs->dropentry, 1);
 121                         ipvs->sysctl_drop_entry = 2;
 122                 } else {
 123                         atomic_set(&ipvs->dropentry, 0);
 124                 }
 125                 break;
 126         case 2:
 127                 if (nomem) {
 128                         atomic_set(&ipvs->dropentry, 1);
 129                 } else {
 130                         atomic_set(&ipvs->dropentry, 0);
 131                         ipvs->sysctl_drop_entry = 1;
 132                 }
 133                 break;
 134         case 3:
 135                 atomic_set(&ipvs->dropentry, 1);
 136                 break;
 137         }
 138         spin_unlock(&ipvs->dropentry_lock);
 139
 140         /* drop_packet */
 141         spin_lock(&ipvs->droppacket_lock);
 142         switch (ipvs->sysctl_drop_packet) {
 143         case 0:
 144                 ipvs->drop_rate = 0;
 145                 break;
 146         case 1:
 147                 if (nomem) {
 148                         ipvs->drop_rate = ipvs->drop_counter
 149                                 = ipvs->sysctl_amemthresh /
 150                                 (ipvs->sysctl_amemthresh-availmem);
 151                         ipvs->sysctl_drop_packet = 2;
 152                 } else {
 153                         ipvs->drop_rate = 0;
 154                 }
 155                 break;
 156         case 2:
 157                 if (nomem) {
 158                         ipvs->drop_rate = ipvs->drop_counter
 159                                 = ipvs->sysctl_amemthresh /
 160                                 (ipvs->sysctl_amemthresh-availmem);
 161                 } else {
 162                         ipvs->drop_rate = 0;
 163                         ipvs->sysctl_drop_packet = 1;
 164                 }
 165                 break;
 166         case 3:
 167                 ipvs->drop_rate = ipvs->sysctl_am_droprate;
 168                 break;
 169         }
 170         spin_unlock(&ipvs->droppacket_lock);
 171
 172         /* secure_tcp */
 173         spin_lock(&ipvs->securetcp_lock);
 174         switch (ipvs->sysctl_secure_tcp) {
 175         case 0:
 176                 if (ipvs->old_secure_tcp >= 2)
 177                         to_change = 0;
 178                 break;
 179         case 1:
 180                 if (nomem) {
 181                         if (ipvs->old_secure_tcp < 2)
 182                                 to_change = 1;
 183                         ipvs->sysctl_secure_tcp = 2;
 184                 } else {
 185                         if (ipvs->old_secure_tcp >= 2)
 186                                 to_change = 0;
 187                 }
 188                 break;
 189         case 2:
 190                 if (nomem) {
 191                         if (ipvs->old_secure_tcp < 2)
 192                                 to_change = 1;
 193                 } else {
 194                         if (ipvs->old_secure_tcp >= 2)
 195                                 to_change = 0;
 196                         ipvs->sysctl_secure_tcp = 1;
 197                 }
 198                 break;
 199         case 3:
 200                 if (ipvs->old_secure_tcp < 2)
 201                         to_change = 1;
 202                 break;
 203         }
 204         ipvs->old_secure_tcp = ipvs->sysctl_secure_tcp;
 205         if (to_change >= 0)
 206                 ip_vs_protocol_timeout_change(ipvs,
 207                                               ipvs->sysctl_secure_tcp > 1);
 208         spin_unlock(&ipvs->securetcp_lock);
 209
 210         local_bh_enable();
 211 }
 212
 213 /* Handler for delayed work for expiring no
 214  * destination connections
 215  */
 216 static void expire_nodest_conn_handler(struct work_struct *work)
 217 {
 218         struct netns_ipvs *ipvs;
 219
 220         ipvs = container_of(work, struct netns_ipvs,
 221                             expire_nodest_conn_work.work);
 222         ip_vs_expire_nodest_conn_flush(ipvs);
 223 }
 224
 225 /*
 226  *      Timer for checking the defense
 227  */
 228 #define DEFENSE_TIMER_PERIOD    1*HZ
 229
 230 static void defense_work_handler(struct work_struct *work)
 231 {
 232         struct netns_ipvs *ipvs =
 233                 container_of(work, struct netns_ipvs, defense_work.work);
 234
 235         update_defense_level(ipvs);
 236         if (atomic_read(&ipvs->dropentry))
 237                 ip_vs_random_dropentry(ipvs);
 238         queue_delayed_work(system_long_wq, &ipvs->defense_work,
 239                            DEFENSE_TIMER_PERIOD);
 240 }
 241 #endif
 242
 243 static void est_reload_work_handler(struct work_struct *work)
 244 {
 245         struct netns_ipvs *ipvs =
 246                 container_of(work, struct netns_ipvs, est_reload_work.work);
 247         int genid_done = atomic_read(&ipvs->est_genid_done);
 248         unsigned long delay = HZ / 10;  /* repeat startups after failure */
 249         bool repeat = false;
 250         int genid;
 251         int id;
 252
 253         mutex_lock(&ipvs->est_mutex);
 254         genid = atomic_read(&ipvs->est_genid);
 255         for (id = 0; id < ipvs->est_kt_count; id++) {
 256                 struct ip_vs_est_kt_data *kd = ipvs->est_kt_arr[id];
 257
 258                 /* netns clean up started, abort delayed work */
 259                 if (!ipvs->enable)
 260                         goto unlock;
 261                 if (!kd)
 262                         continue;
 263                 /* New config ? Stop kthread tasks */
 264                 if (genid != genid_done)
 265                         ip_vs_est_kthread_stop(kd);
 266                 if (!kd->task && !ip_vs_est_stopped(ipvs)) {
 267                         /* Do not start kthreads above 0 in calc phase */
 268                         if ((!id || !ipvs->est_calc_phase) &&
 269                             ip_vs_est_kthread_start(ipvs, kd) < 0)
 270                                 repeat = true;
 271                 }
 272         }
 273
 274         atomic_set(&ipvs->est_genid_done, genid);
 275
 276         if (repeat)
 277                 queue_delayed_work(system_long_wq, &ipvs->est_reload_work,
 278                                    delay);
 279
 280 unlock:
 281         mutex_unlock(&ipvs->est_mutex);
 282 }
 283
 284 int
 285 ip_vs_use_count_inc(void)
 286 {
 287         return try_module_get(THIS_MODULE);
 288 }
 289
 290 void
 291 ip_vs_use_count_dec(void)
 292 {
 293         module_put(THIS_MODULE);
 294 }
 295
 296
 297 /*
 298  *      Hash table: for virtual service lookups
 299  */
 300 #define IP_VS_SVC_TAB_BITS 8
 301 #define IP_VS_SVC_TAB_SIZE (1 << IP_VS_SVC_TAB_BITS)
 302 #define IP_VS_SVC_TAB_MASK (IP_VS_SVC_TAB_SIZE - 1)
 303
 304 /* the service table hashed by <protocol, addr, port> */
 305 static struct hlist_head ip_vs_svc_table[IP_VS_SVC_TAB_SIZE];
 306 /* the service table hashed by fwmark */
 307 static struct hlist_head ip_vs_svc_fwm_table[IP_VS_SVC_TAB_SIZE];
 308
 309
 310 /*
 311  *      Returns hash value for virtual service
 312  */
 313 static inline unsigned int
 314 ip_vs_svc_hashkey(struct netns_ipvs *ipvs, int af, unsigned int proto,
 315                   const union nf_inet_addr *addr, __be16 port)
 316 {
 317         unsigned int porth = ntohs(port);
 318         __be32 addr_fold = addr->ip;
 319         __u32 ahash;
 320
 321 #ifdef CONFIG_IP_VS_IPV6
 322         if (af == AF_INET6)
 323                 addr_fold = addr->ip6[0]^addr->ip6[1]^
 324                             addr->ip6[2]^addr->ip6[3];
 325 #endif
 326         ahash = ntohl(addr_fold);
 327         ahash ^= ((size_t) ipvs >> 8);
 328
 329         return (proto ^ ahash ^ (porth >> IP_VS_SVC_TAB_BITS) ^ porth) &
 330                IP_VS_SVC_TAB_MASK;
 331 }
 332
 333 /*
 334  *      Returns hash value of fwmark for virtual service lookup
 335  */
 336 static inline unsigned int ip_vs_svc_fwm_hashkey(struct netns_ipvs *ipvs, __u32 fwmark)
 337 {
 338         return (((size_t)ipvs>>8) ^ fwmark) & IP_VS_SVC_TAB_MASK;
 339 }
 340
 341 /*
 342  *      Hashes a service in the ip_vs_svc_table by <netns,proto,addr,port>
 343  *      or in the ip_vs_svc_fwm_table by fwmark.
 344  *      Should be called with locked tables.
 345  */
 346 static int ip_vs_svc_hash(struct ip_vs_service *svc)
 347 {
 348         unsigned int hash;
 349
 350         if (svc->flags & IP_VS_SVC_F_HASHED) {
 351                 pr_err("%s(): request for already hashed, called from %pS\n",
 352                        __func__, __builtin_return_address(0));
 353                 return 0;
 354         }
 355
 356         if (svc->fwmark == 0) {
 357                 /*
 358                  *  Hash it by <netns,protocol,addr,port> in ip_vs_svc_table
 359                  */
 360                 hash = ip_vs_svc_hashkey(svc->ipvs, svc->af, svc->protocol,
 361                                          &svc->addr, svc->port);
 362                 hlist_add_head_rcu(&svc->s_list, &ip_vs_svc_table[hash]);
 363         } else {
 364                 /*
 365                  *  Hash it by fwmark in svc_fwm_table
 366                  */
 367                 hash = ip_vs_svc_fwm_hashkey(svc->ipvs, svc->fwmark);
 368                 hlist_add_head_rcu(&svc->f_list, &ip_vs_svc_fwm_table[hash]);
 369         }
 370
 371         svc->flags |= IP_VS_SVC_F_HASHED;
 372         /* increase its refcnt because it is referenced by the svc table */
 373         atomic_inc(&svc->refcnt);
 374         return 1;
 375 }
 376
 377
 378 /*
 379  *      Unhashes a service from svc_table / svc_fwm_table.
 380  *      Should be called with locked tables.
 381  */
 382 static int ip_vs_svc_unhash(struct ip_vs_service *svc)
 383 {
 384         if (!(svc->flags & IP_VS_SVC_F_HASHED)) {
 385                 pr_err("%s(): request for unhash flagged, called from %pS\n",
 386                        __func__, __builtin_return_address(0));
 387                 return 0;
 388         }
 389
 390         if (svc->fwmark == 0) {
 391                 /* Remove it from the svc_table table */
 392                 hlist_del_rcu(&svc->s_list);
 393         } else {
 394                 /* Remove it from the svc_fwm_table table */
 395                 hlist_del_rcu(&svc->f_list);
 396         }
 397
 398         svc->flags &= ~IP_VS_SVC_F_HASHED;
 399         atomic_dec(&svc->refcnt);
 400         return 1;
 401 }
 402
 403
 404 /*
 405  *      Get service by {netns, proto,addr,port} in the service table.
 406  */
 407 static inline struct ip_vs_service *
 408 __ip_vs_service_find(struct netns_ipvs *ipvs, int af, __u16 protocol,
 409                      const union nf_inet_addr *vaddr, __be16 vport)
 410 {
 411         unsigned int hash;
 412         struct ip_vs_service *svc;
 413
 414         /* Check for "full" addressed entries */
 415         hash = ip_vs_svc_hashkey(ipvs, af, protocol, vaddr, vport);
 416
 417         hlist_for_each_entry_rcu(svc, &ip_vs_svc_table[hash], s_list) {
 418                 if ((svc->af == af)
 419                     && ip_vs_addr_equal(af, &svc->addr, vaddr)
 420                     && (svc->port == vport)
 421                     && (svc->protocol == protocol)
 422                     && (svc->ipvs == ipvs)) {
 423                         /* HIT */
 424                         return svc;
 425                 }
 426         }
 427
 428         return NULL;
 429 }
 430
 431
 432 /*
 433  *      Get service by {fwmark} in the service table.
 434  */
 435 static inline struct ip_vs_service *
 436 __ip_vs_svc_fwm_find(struct netns_ipvs *ipvs, int af, __u32 fwmark)
 437 {
 438         unsigned int hash;
 439         struct ip_vs_service *svc;
 440
 441         /* Check for fwmark addressed entries */
 442         hash = ip_vs_svc_fwm_hashkey(ipvs, fwmark);
 443
 444         hlist_for_each_entry_rcu(svc, &ip_vs_svc_fwm_table[hash], f_list) {
 445                 if (svc->fwmark == fwmark && svc->af == af
 446                     && (svc->ipvs == ipvs)) {
 447                         /* HIT */
 448                         return svc;
 449                 }
 450         }
 451
 452         return NULL;
 453 }
 454
 455 /* Find service, called under RCU lock */
 456 struct ip_vs_service *
 457 ip_vs_service_find(struct netns_ipvs *ipvs, int af, __u32 fwmark, __u16 protocol,
 458                    const union nf_inet_addr *vaddr, __be16 vport)
 459 {
 460         struct ip_vs_service *svc;
 461
 462         /*
 463          *      Check the table hashed by fwmark first
 464          */
 465         if (fwmark) {
 466                 svc = __ip_vs_svc_fwm_find(ipvs, af, fwmark);
 467                 if (svc)
 468                         goto out;
 469         }
 470
 471         /*
 472          *      Check the table hashed by <protocol,addr,port>
 473          *      for "full" addressed entries
 474          */
 475         svc = __ip_vs_service_find(ipvs, af, protocol, vaddr, vport);
 476
 477         if (!svc && protocol == IPPROTO_TCP &&
 478             atomic_read(&ipvs->ftpsvc_counter) &&
 479             (vport == FTPDATA || !inet_port_requires_bind_service(ipvs->net, ntohs(vport)))) {
 480                 /*
 481                  * Check if ftp service entry exists, the packet
 482                  * might belong to FTP data connections.
 483                  */
 484                 svc = __ip_vs_service_find(ipvs, af, protocol, vaddr, FTPPORT);
 485         }
 486
 487         if (svc == NULL
 488             && atomic_read(&ipvs->nullsvc_counter)) {
 489                 /*
 490                  * Check if the catch-all port (port zero) exists
 491                  */
 492                 svc = __ip_vs_service_find(ipvs, af, protocol, vaddr, 0);
 493         }
 494
 495   out:
 496         IP_VS_DBG_BUF(9, "lookup service: fwm %u %s %s:%u %s\n",
 497                       fwmark, ip_vs_proto_name(protocol),
 498                       IP_VS_DBG_ADDR(af, vaddr), ntohs(vport),
 499                       svc ? "hit" : "not hit");
 500
 501         return svc;
 502 }
 503
 504
 505 static inline void
 506 __ip_vs_bind_svc(struct ip_vs_dest *dest, struct ip_vs_service *svc)
 507 {
 508         atomic_inc(&svc->refcnt);
 509         rcu_assign_pointer(dest->svc, svc);
 510 }
 511
 512 static void ip_vs_service_free(struct ip_vs_service *svc)
 513 {
 514         ip_vs_stats_release(&svc->stats);
 515         kfree(svc);
 516 }
 517
 518 static void ip_vs_service_rcu_free(struct rcu_head *head)
 519 {
 520         struct ip_vs_service *svc;
 521
 522         svc = container_of(head, struct ip_vs_service, rcu_head);
 523         ip_vs_service_free(svc);
 524 }
 525
 526 static void __ip_vs_svc_put(struct ip_vs_service *svc)
 527 {
 528         if (atomic_dec_and_test(&svc->refcnt)) {
 529                 IP_VS_DBG_BUF(3, "Removing service %u/%s:%u\n",
 530                               svc->fwmark,
 531                               IP_VS_DBG_ADDR(svc->af, &svc->addr),
 532                               ntohs(svc->port));
 533                 call_rcu(&svc->rcu_head, ip_vs_service_rcu_free);
 534         }
 535 }
 536
 537
 538 /*
 539  *      Returns hash value for real service
 540  */
 541 static inline unsigned int ip_vs_rs_hashkey(int af,
 542                                             const union nf_inet_addr *addr,
 543                                             __be16 port)
 544 {
 545         unsigned int porth = ntohs(port);
 546         __be32 addr_fold = addr->ip;
 547
 548 #ifdef CONFIG_IP_VS_IPV6
 549         if (af == AF_INET6)
 550                 addr_fold = addr->ip6[0]^addr->ip6[1]^
 551                             addr->ip6[2]^addr->ip6[3];
 552 #endif
 553
 554         return (ntohl(addr_fold)^(porth>>IP_VS_RTAB_BITS)^porth)
 555                 & IP_VS_RTAB_MASK;
 556 }
 557
 558 /* Hash ip_vs_dest in rs_table by <proto,addr,port>. */
 559 static void ip_vs_rs_hash(struct netns_ipvs *ipvs, struct ip_vs_dest *dest)
 560 {
 561         unsigned int hash;
 562         __be16 port;
 563
 564         if (dest->in_rs_table)
 565                 return;
 566
 567         switch (IP_VS_DFWD_METHOD(dest)) {
 568         case IP_VS_CONN_F_MASQ:
 569                 port = dest->port;
 570                 break;
 571         case IP_VS_CONN_F_TUNNEL:
 572                 switch (dest->tun_type) {
 573                 case IP_VS_CONN_F_TUNNEL_TYPE_GUE:
 574                         port = dest->tun_port;
 575                         break;
 576                 case IP_VS_CONN_F_TUNNEL_TYPE_IPIP:
 577                 case IP_VS_CONN_F_TUNNEL_TYPE_GRE:
 578                         port = 0;
 579                         break;
 580                 default:
 581                         return;
 582                 }
 583                 break;
 584         default:
 585                 return;
 586         }
 587
 588         /*
 589          *      Hash by proto,addr,port,
 590          *      which are the parameters of the real service.
 591          */
 592         hash = ip_vs_rs_hashkey(dest->af, &dest->addr, port);
 593
 594         hlist_add_head_rcu(&dest->d_list, &ipvs->rs_table[hash]);
 595         dest->in_rs_table = 1;
 596 }
 597
 598 /* Unhash ip_vs_dest from rs_table. */
 599 static void ip_vs_rs_unhash(struct ip_vs_dest *dest)
 600 {
 601         /*
 602          * Remove it from the rs_table table.
 603          */
 604         if (dest->in_rs_table) {
 605                 hlist_del_rcu(&dest->d_list);
 606                 dest->in_rs_table = 0;
 607         }
 608 }
 609
 610 /* Check if real service by <proto,addr,port> is present */
 611 bool ip_vs_has_real_service(struct netns_ipvs *ipvs, int af, __u16 protocol,
 612                             const union nf_inet_addr *daddr, __be16 dport)
 613 {
 614         unsigned int hash;
 615         struct ip_vs_dest *dest;
 616
 617         /* Check for "full" addressed entries */
 618         hash = ip_vs_rs_hashkey(af, daddr, dport);
 619
 620         hlist_for_each_entry_rcu(dest, &ipvs->rs_table[hash], d_list) {
 621                 if (dest->port == dport &&
 622                     dest->af == af &&
 623                     ip_vs_addr_equal(af, &dest->addr, daddr) &&
 624                     (dest->protocol == protocol || dest->vfwmark) &&
 625                     IP_VS_DFWD_METHOD(dest) == IP_VS_CONN_F_MASQ) {
 626                         /* HIT */
 627                         return true;
 628                 }
 629         }
 630
 631         return false;
 632 }
 633
 634 /* Find real service record by <proto,addr,port>.
 635  * In case of multiple records with the same <proto,addr,port>, only
 636  * the first found record is returned.
 637  *
 638  * To be called under RCU lock.
 639  */
 640 struct ip_vs_dest *ip_vs_find_real_service(struct netns_ipvs *ipvs, int af,
 641                                            __u16 protocol,
 642                                            const union nf_inet_addr *daddr,
 643                                            __be16 dport)
 644 {
 645         unsigned int hash;
 646         struct ip_vs_dest *dest;
 647
 648         /* Check for "full" addressed entries */
 649         hash = ip_vs_rs_hashkey(af, daddr, dport);
 650
 651         hlist_for_each_entry_rcu(dest, &ipvs->rs_table[hash], d_list) {
 652                 if (dest->port == dport &&
 653                     dest->af == af &&
 654                     ip_vs_addr_equal(af, &dest->addr, daddr) &&
 655                     (dest->protocol == protocol || dest->vfwmark) &&
 656                     IP_VS_DFWD_METHOD(dest) == IP_VS_CONN_F_MASQ) {
 657                         /* HIT */
 658                         return dest;
 659                 }
 660         }
 661
 662         return NULL;
 663 }
 664
 665 /* Find real service record by <af,addr,tun_port>.
 666  * In case of multiple records with the same <af,addr,tun_port>, only
 667  * the first found record is returned.
 668  *
 669  * To be called under RCU lock.
 670  */
 671 struct ip_vs_dest *ip_vs_find_tunnel(struct netns_ipvs *ipvs, int af,
 672                                      const union nf_inet_addr *daddr,
 673                                      __be16 tun_port)
 674 {
 675         struct ip_vs_dest *dest;
 676         unsigned int hash;
 677
 678         /* Check for "full" addressed entries */
 679         hash = ip_vs_rs_hashkey(af, daddr, tun_port);
 680
 681         hlist_for_each_entry_rcu(dest, &ipvs->rs_table[hash], d_list) {
 682                 if (dest->tun_port == tun_port &&
 683                     dest->af == af &&
 684                     ip_vs_addr_equal(af, &dest->addr, daddr) &&
 685                     IP_VS_DFWD_METHOD(dest) == IP_VS_CONN_F_TUNNEL) {
 686                         /* HIT */
 687                         return dest;
 688                 }
 689         }
 690
 691         return NULL;
 692 }
 693
 694 /* Lookup destination by {addr,port} in the given service
 695  * Called under RCU lock.
 696  */
 697 static struct ip_vs_dest *
 698 ip_vs_lookup_dest(struct ip_vs_service *svc, int dest_af,
 699                   const union nf_inet_addr *daddr, __be16 dport)
 700 {
 701         struct ip_vs_dest *dest;
 702
 703         /*
 704          * Find the destination for the given service
 705          */
 706         list_for_each_entry_rcu(dest, &svc->destinations, n_list) {
 707                 if ((dest->af == dest_af) &&
 708                     ip_vs_addr_equal(dest_af, &dest->addr, daddr) &&
 709                     (dest->port == dport)) {
 710                         /* HIT */
 711                         return dest;
 712                 }
 713         }
 714
 715         return NULL;
 716 }
 717
 718 /*
 719  * Find destination by {daddr,dport,vaddr,protocol}
 720  * Created to be used in ip_vs_process_message() in
 721  * the backup synchronization daemon. It finds the
 722  * destination to be bound to the received connection
 723  * on the backup.
 724  * Called under RCU lock, no refcnt is returned.
 725  */
 726 struct ip_vs_dest *ip_vs_find_dest(struct netns_ipvs *ipvs, int svc_af, int dest_af,
 727                                    const union nf_inet_addr *daddr,
 728                                    __be16 dport,
 729                                    const union nf_inet_addr *vaddr,
 730                                    __be16 vport, __u16 protocol, __u32 fwmark,
 731                                    __u32 flags)
 732 {
 733         struct ip_vs_dest *dest;
 734         struct ip_vs_service *svc;
 735         __be16 port = dport;
 736
 737         svc = ip_vs_service_find(ipvs, svc_af, fwmark, protocol, vaddr, vport);
 738         if (!svc)
 739                 return NULL;
 740         if (fwmark && (flags & IP_VS_CONN_F_FWD_MASK) != IP_VS_CONN_F_MASQ)
 741                 port = 0;
 742         dest = ip_vs_lookup_dest(svc, dest_af, daddr, port);
 743         if (!dest)
 744                 dest = ip_vs_lookup_dest(svc, dest_af, daddr, port ^ dport);
 745         return dest;
 746 }
 747
 748 void ip_vs_dest_dst_rcu_free(struct rcu_head *head)
 749 {
 750         struct ip_vs_dest_dst *dest_dst = container_of(head,
 751                                                        struct ip_vs_dest_dst,
 752                                                        rcu_head);
 753
 754         dst_release(dest_dst->dst_cache);
 755         kfree(dest_dst);
 756 }
 757
 758 /* Release dest_dst and dst_cache for dest in user context */
 759 static void __ip_vs_dst_cache_reset(struct ip_vs_dest *dest)
 760 {
 761         struct ip_vs_dest_dst *old;
 762
 763         old = rcu_dereference_protected(dest->dest_dst, 1);
 764         if (old) {
 765                 RCU_INIT_POINTER(dest->dest_dst, NULL);
 766                 call_rcu(&old->rcu_head, ip_vs_dest_dst_rcu_free);
 767         }
 768 }
 769
 770 /*
 771  *  Lookup dest by {svc,addr,port} in the destination trash.
 772  *  The destination trash is used to hold the destinations that are removed
 773  *  from the service table but are still referenced by some conn entries.
 774  *  The reason to add the destination trash is when the dest is temporary
 775  *  down (either by administrator or by monitor program), the dest can be
 776  *  picked back from the trash, the remaining connections to the dest can
 777  *  continue, and the counting information of the dest is also useful for
 778  *  scheduling.
 779  */
 780 static struct ip_vs_dest *
 781 ip_vs_trash_get_dest(struct ip_vs_service *svc, int dest_af,
 782                      const union nf_inet_addr *daddr, __be16 dport)
 783 {
 784         struct ip_vs_dest *dest;
 785         struct netns_ipvs *ipvs = svc->ipvs;
 786
 787         /*
 788          * Find the destination in trash
 789          */
 790         spin_lock_bh(&ipvs->dest_trash_lock);
 791         list_for_each_entry(dest, &ipvs->dest_trash, t_list) {
 792                 IP_VS_DBG_BUF(3, "Destination %u/%s:%u still in trash, "
 793                               "dest->refcnt=%d\n",
 794                               dest->vfwmark,
 795                               IP_VS_DBG_ADDR(dest->af, &dest->addr),
 796                               ntohs(dest->port),
 797                               refcount_read(&dest->refcnt));
 798                 if (dest->af == dest_af &&
 799                     ip_vs_addr_equal(dest_af, &dest->addr, daddr) &&
 800                     dest->port == dport &&
 801                     dest->vfwmark == svc->fwmark &&
 802                     dest->protocol == svc->protocol &&
 803                     (svc->fwmark ||
 804                      (ip_vs_addr_equal(svc->af, &dest->vaddr, &svc->addr) &&
 805                       dest->vport == svc->port))) {
 806                         /* HIT */
 807                         list_del(&dest->t_list);
 808                         goto out;
 809                 }
 810         }
 811
 812         dest = NULL;
 813
 814 out:
 815         spin_unlock_bh(&ipvs->dest_trash_lock);
 816
 817         return dest;
 818 }
 819
 820 static void ip_vs_dest_rcu_free(struct rcu_head *head)
 821 {
 822         struct ip_vs_dest *dest;
 823
 824         dest = container_of(head, struct ip_vs_dest, rcu_head);
 825         ip_vs_stats_release(&dest->stats);
 826         ip_vs_dest_put_and_free(dest);
 827 }
 828
 829 static void ip_vs_dest_free(struct ip_vs_dest *dest)
 830 {
 831         struct ip_vs_service *svc = rcu_dereference_protected(dest->svc, 1);
 832
 833         __ip_vs_dst_cache_reset(dest);
 834         __ip_vs_svc_put(svc);
 835         call_rcu(&dest->rcu_head, ip_vs_dest_rcu_free);
 836 }
 837
 838 /*
 839  *  Clean up all the destinations in the trash
 840  *  Called by the ip_vs_control_cleanup()
 841  *
 842  *  When the ip_vs_control_clearup is activated by ipvs module exit,
 843  *  the service tables must have been flushed and all the connections
 844  *  are expired, and the refcnt of each destination in the trash must
 845  *  be 1, so we simply release them here.
 846  */
 847 static void ip_vs_trash_cleanup(struct netns_ipvs *ipvs)
 848 {
 849         struct ip_vs_dest *dest, *nxt;
 850
 851         del_timer_sync(&ipvs->dest_trash_timer);
 852         /* No need to use dest_trash_lock */
 853         list_for_each_entry_safe(dest, nxt, &ipvs->dest_trash, t_list) {
 854                 list_del(&dest->t_list);
 855                 ip_vs_dest_free(dest);
 856         }
 857 }
 858
 859 static void ip_vs_stats_rcu_free(struct rcu_head *head)
 860 {
 861         struct ip_vs_stats_rcu *rs = container_of(head,
 862                                                   struct ip_vs_stats_rcu,
 863                                                   rcu_head);
 864
 865         ip_vs_stats_release(&rs->s);
 866         kfree(rs);
 867 }
 868
 869 static void
 870 ip_vs_copy_stats(struct ip_vs_kstats *dst, struct ip_vs_stats *src)
 871 {
 872 #define IP_VS_SHOW_STATS_COUNTER(c) dst->c = src->kstats.c - src->kstats0.c
 873
 874         spin_lock(&src->lock);
 875
 876         IP_VS_SHOW_STATS_COUNTER(conns);
 877         IP_VS_SHOW_STATS_COUNTER(inpkts);
 878         IP_VS_SHOW_STATS_COUNTER(outpkts);
 879         IP_VS_SHOW_STATS_COUNTER(inbytes);
 880         IP_VS_SHOW_STATS_COUNTER(outbytes);
 881
 882         ip_vs_read_estimator(dst, src);
 883
 884         spin_unlock(&src->lock);
 885 }
 886
 887 static void
 888 ip_vs_export_stats_user(struct ip_vs_stats_user *dst, struct ip_vs_kstats *src)
 889 {
 890         dst->conns = (u32)src->conns;
 891         dst->inpkts = (u32)src->inpkts;
 892         dst->outpkts = (u32)src->outpkts;
 893         dst->inbytes = src->inbytes;
 894         dst->outbytes = src->outbytes;
 895         dst->cps = (u32)src->cps;
 896         dst->inpps = (u32)src->inpps;
 897         dst->outpps = (u32)src->outpps;
 898         dst->inbps = (u32)src->inbps;
 899         dst->outbps = (u32)src->outbps;
 900 }
 901
 902 static void
 903 ip_vs_zero_stats(struct ip_vs_stats *stats)
 904 {
 905         spin_lock(&stats->lock);
 906
 907         /* get current counters as zero point, rates are zeroed */
 908
 909 #define IP_VS_ZERO_STATS_COUNTER(c) stats->kstats0.c = stats->kstats.c
 910
 911         IP_VS_ZERO_STATS_COUNTER(conns);
 912         IP_VS_ZERO_STATS_COUNTER(inpkts);
 913         IP_VS_ZERO_STATS_COUNTER(outpkts);
 914         IP_VS_ZERO_STATS_COUNTER(inbytes);
 915         IP_VS_ZERO_STATS_COUNTER(outbytes);
 916
 917         ip_vs_zero_estimator(stats);
 918
 919         spin_unlock(&stats->lock);
 920 }
 921
 922 /* Allocate fields after kzalloc */
 923 int ip_vs_stats_init_alloc(struct ip_vs_stats *s)
 924 {
 925         int i;
 926
 927         spin_lock_init(&s->lock);
 928         s->cpustats = alloc_percpu(struct ip_vs_cpu_stats);
 929         if (!s->cpustats)
 930                 return -ENOMEM;
 931
 932         for_each_possible_cpu(i) {
 933                 struct ip_vs_cpu_stats *cs = per_cpu_ptr(s->cpustats, i);
 934
 935                 u64_stats_init(&cs->syncp);
 936         }
 937         return 0;
 938 }
 939
 940 struct ip_vs_stats *ip_vs_stats_alloc(void)
 941 {
 942         struct ip_vs_stats *s = kzalloc(sizeof(*s), GFP_KERNEL);
 943
 944         if (s && ip_vs_stats_init_alloc(s) >= 0)
 945                 return s;
 946         kfree(s);
 947         return NULL;
 948 }
 949
 950 void ip_vs_stats_release(struct ip_vs_stats *stats)
 951 {
 952         free_percpu(stats->cpustats);
 953 }
 954
 955 void ip_vs_stats_free(struct ip_vs_stats *stats)
 956 {
 957         if (stats) {
 958                 ip_vs_stats_release(stats);
 959                 kfree(stats);
 960         }
 961 }
 962
 963 /*
 964  *      Update a destination in the given service
 965  */
 966 static void
 967 __ip_vs_update_dest(struct ip_vs_service *svc, struct ip_vs_dest *dest,
 968                     struct ip_vs_dest_user_kern *udest, int add)
 969 {
 970         struct netns_ipvs *ipvs = svc->ipvs;
 971         struct ip_vs_service *old_svc;
 972         struct ip_vs_scheduler *sched;
 973         int conn_flags;
 974
 975         /* We cannot modify an address and change the address family */
 976         BUG_ON(!add && udest->af != dest->af);
 977
 978         if (add && udest->af != svc->af)
 979                 ipvs->mixed_address_family_dests++;
 980
 981         /* keep the last_weight with latest non-0 weight */
 982         if (add || udest->weight != 0)
 983                 atomic_set(&dest->last_weight, udest->weight);
 984
 985         /* set the weight and the flags */
 986         atomic_set(&dest->weight, udest->weight);
 987         conn_flags = udest->conn_flags & IP_VS_CONN_F_DEST_MASK;
 988         conn_flags |= IP_VS_CONN_F_INACTIVE;
 989
 990         /* Need to rehash? */
 991         if ((udest->conn_flags & IP_VS_CONN_F_FWD_MASK) !=
 992             IP_VS_DFWD_METHOD(dest) ||
 993             udest->tun_type != dest->tun_type ||
 994             udest->tun_port != dest->tun_port)
 995                 ip_vs_rs_unhash(dest);
 996
 997         /* set the tunnel info */
 998         dest->tun_type = udest->tun_type;
 999         dest->tun_port = udest->tun_port;
1000         dest->tun_flags = udest->tun_flags;
1001
1002         /* set the IP_VS_CONN_F_NOOUTPUT flag if not masquerading/NAT */
1003         if ((conn_flags & IP_VS_CONN_F_FWD_MASK) != IP_VS_CONN_F_MASQ) {
1004                 conn_flags |= IP_VS_CONN_F_NOOUTPUT;
1005         } else {
1006                 /* FTP-NAT requires conntrack for mangling */
1007                 if (svc->port == FTPPORT)
1008                         ip_vs_register_conntrack(svc);
1009         }
1010         atomic_set(&dest->conn_flags, conn_flags);
1011         /* Put the real service in rs_table if not present. */
1012         ip_vs_rs_hash(ipvs, dest);
1013
1014         /* bind the service */
1015         old_svc = rcu_dereference_protected(dest->svc, 1);
1016         if (!old_svc) {
1017                 __ip_vs_bind_svc(dest, svc);
1018         } else {
1019                 if (old_svc != svc) {
1020                         ip_vs_zero_stats(&dest->stats);
1021                         __ip_vs_bind_svc(dest, svc);
1022                         __ip_vs_svc_put(old_svc);
1023                 }
1024         }
1025
1026         /* set the dest status flags */
1027         dest->flags |= IP_VS_DEST_F_AVAILABLE;
1028
1029         if (udest->u_threshold == 0 || udest->u_threshold > dest->u_threshold)
1030                 dest->flags &= ~IP_VS_DEST_F_OVERLOAD;
1031         dest->u_threshold = udest->u_threshold;
1032         dest->l_threshold = udest->l_threshold;
1033
1034         dest->af = udest->af;
1035
1036         spin_lock_bh(&dest->dst_lock);
1037         __ip_vs_dst_cache_reset(dest);
1038         spin_unlock_bh(&dest->dst_lock);
1039
1040         if (add) {
1041                 list_add_rcu(&dest->n_list, &svc->destinations);
1042                 svc->num_dests++;
1043                 sched = rcu_dereference_protected(svc->scheduler, 1);
1044                 if (sched && sched->add_dest)
1045                         sched->add_dest(svc, dest);
1046         } else {
1047                 sched = rcu_dereference_protected(svc->scheduler, 1);
1048                 if (sched && sched->upd_dest)
1049                         sched->upd_dest(svc, dest);
1050         }
1051 }
1052
1053
1054 /*
1055  *      Create a destination for the given service
1056  */
1057 static int
1058 ip_vs_new_dest(struct ip_vs_service *svc, struct ip_vs_dest_user_kern *udest)
1059 {
1060         struct ip_vs_dest *dest;
1061         unsigned int atype;
1062         int ret;
1063
1064 #ifdef CONFIG_IP_VS_IPV6
1065         if (udest->af == AF_INET6) {
1066                 atype = ipv6_addr_type(&udest->addr.in6);
1067                 if ((!(atype & IPV6_ADDR_UNICAST) ||
1068                         atype & IPV6_ADDR_LINKLOCAL) &&
1069                         !__ip_vs_addr_is_local_v6(svc->ipvs->net, &udest->addr.in6))
1070                         return -EINVAL;
1071
1072                 ret = nf_defrag_ipv6_enable(svc->ipvs->net);
1073                 if (ret)
1074                         return ret;
1075         } else
1076 #endif
1077         {
1078                 atype = inet_addr_type(svc->ipvs->net, udest->addr.ip);
1079                 if (atype != RTN_LOCAL && atype != RTN_UNICAST)
1080                         return -EINVAL;
1081         }
1082
1083         dest = kzalloc(sizeof(struct ip_vs_dest), GFP_KERNEL);
1084         if (dest == NULL)
1085                 return -ENOMEM;
1086
1087         ret = ip_vs_stats_init_alloc(&dest->stats);
1088         if (ret < 0)
1089                 goto err_alloc;
1090
1091         ret = ip_vs_start_estimator(svc->ipvs, &dest->stats);
1092         if (ret < 0)
1093                 goto err_stats;
1094
1095         dest->af = udest->af;
1096         dest->protocol = svc->protocol;
1097         dest->vaddr = svc->addr;
1098         dest->vport = svc->port;
1099         dest->vfwmark = svc->fwmark;
1100         ip_vs_addr_copy(udest->af, &dest->addr, &udest->addr);
1101         dest->port = udest->port;
1102
1103         atomic_set(&dest->activeconns, 0);
1104         atomic_set(&dest->inactconns, 0);
1105         atomic_set(&dest->persistconns, 0);
1106         refcount_set(&dest->refcnt, 1);
1107
1108         INIT_HLIST_NODE(&dest->d_list);
1109         spin_lock_init(&dest->dst_lock);
1110         __ip_vs_update_dest(svc, dest, udest, 1);
1111
1112         return 0;
1113
1114 err_stats:
1115         ip_vs_stats_release(&dest->stats);
1116
1117 err_alloc:
1118         kfree(dest);
1119         return ret;
1120 }
1121
1122
1123 /*
1124  *      Add a destination into an existing service
1125  */
1126 static int
1127 ip_vs_add_dest(struct ip_vs_service *svc, struct ip_vs_dest_user_kern *udest)
1128 {
1129         struct ip_vs_dest *dest;
1130         union nf_inet_addr daddr;
1131         __be16 dport = udest->port;
1132         int ret;
1133
1134         if (udest->weight < 0) {
1135                 pr_err("%s(): server weight less than zero\n", __func__);
1136                 return -ERANGE;
1137         }
1138
1139         if (udest->l_threshold > udest->u_threshold) {
1140                 pr_err("%s(): lower threshold is higher than upper threshold\n",
1141                         __func__);
1142                 return -ERANGE;
1143         }
1144
1145         if (udest->tun_type == IP_VS_CONN_F_TUNNEL_TYPE_GUE) {
1146                 if (udest->tun_port == 0) {
1147                         pr_err("%s(): tunnel port is zero\n", __func__);
1148                         return -EINVAL;
1149                 }
1150         }
1151
1152         ip_vs_addr_copy(udest->af, &daddr, &udest->addr);
1153
1154         /* We use function that requires RCU lock */
1155         rcu_read_lock();
1156         dest = ip_vs_lookup_dest(svc, udest->af, &daddr, dport);
1157         rcu_read_unlock();
1158
1159         if (dest != NULL) {
1160                 IP_VS_DBG(1, "%s(): dest already exists\n", __func__);
1161                 return -EEXIST;
1162         }
1163
1164         /*
1165          * Check if the dest already exists in the trash and
1166          * is from the same service
1167          */
1168         dest = ip_vs_trash_get_dest(svc, udest->af, &daddr, dport);
1169
1170         if (dest != NULL) {
1171                 IP_VS_DBG_BUF(3, "Get destination %s:%u from trash, "
1172                               "dest->refcnt=%d, service %u/%s:%u\n",
1173                               IP_VS_DBG_ADDR(udest->af, &daddr), ntohs(dport),
1174                               refcount_read(&dest->refcnt),
1175                               dest->vfwmark,
1176                               IP_VS_DBG_ADDR(svc->af, &dest->vaddr),
1177                               ntohs(dest->vport));
1178
1179                 ret = ip_vs_start_estimator(svc->ipvs, &dest->stats);
1180                 if (ret < 0)
1181                         return ret;
1182                 __ip_vs_update_dest(svc, dest, udest, 1);
1183         } else {
1184                 /*
1185                  * Allocate and initialize the dest structure
1186                  */
1187                 ret = ip_vs_new_dest(svc, udest);
1188         }
1189
1190         return ret;
1191 }
1192
1193
1194 /*
1195  *      Edit a destination in the given service
1196  */
1197 static int
1198 ip_vs_edit_dest(struct ip_vs_service *svc, struct ip_vs_dest_user_kern *udest)
1199 {
1200         struct ip_vs_dest *dest;
1201         union nf_inet_addr daddr;
1202         __be16 dport = udest->port;
1203
1204         if (udest->weight < 0) {
1205                 pr_err("%s(): server weight less than zero\n", __func__);
1206                 return -ERANGE;
1207         }
1208
1209         if (udest->l_threshold > udest->u_threshold) {
1210                 pr_err("%s(): lower threshold is higher than upper threshold\n",
1211                         __func__);
1212                 return -ERANGE;
1213         }
1214
1215         if (udest->tun_type == IP_VS_CONN_F_TUNNEL_TYPE_GUE) {
1216                 if (udest->tun_port == 0) {
1217                         pr_err("%s(): tunnel port is zero\n", __func__);
1218                         return -EINVAL;
1219                 }
1220         }
1221
1222         ip_vs_addr_copy(udest->af, &daddr, &udest->addr);
1223
1224         /* We use function that requires RCU lock */
1225         rcu_read_lock();
1226         dest = ip_vs_lookup_dest(svc, udest->af, &daddr, dport);
1227         rcu_read_unlock();
1228
1229         if (dest == NULL) {
1230                 IP_VS_DBG(1, "%s(): dest doesn't exist\n", __func__);
1231                 return -ENOENT;
1232         }
1233
1234         __ip_vs_update_dest(svc, dest, udest, 0);
1235
1236         return 0;
1237 }
1238
1239 /*
1240  *      Delete a destination (must be already unlinked from the service)
1241  */
1242 static void __ip_vs_del_dest(struct netns_ipvs *ipvs, struct ip_vs_dest *dest,
1243                              bool cleanup)
1244 {
1245         ip_vs_stop_estimator(ipvs, &dest->stats);
1246
1247         /*
1248          *  Remove it from the d-linked list with the real services.
1249          */
1250         ip_vs_rs_unhash(dest);
1251
1252         spin_lock_bh(&ipvs->dest_trash_lock);
1253         IP_VS_DBG_BUF(3, "Moving dest %s:%u into trash, dest->refcnt=%d\n",
1254                       IP_VS_DBG_ADDR(dest->af, &dest->addr), ntohs(dest->port),
1255                       refcount_read(&dest->refcnt));
1256         if (list_empty(&ipvs->dest_trash) && !cleanup)
1257                 mod_timer(&ipvs->dest_trash_timer,
1258                           jiffies + (IP_VS_DEST_TRASH_PERIOD >> 1));
1259         /* dest lives in trash with reference */
1260         list_add(&dest->t_list, &ipvs->dest_trash);
1261         dest->idle_start = 0;
1262         spin_unlock_bh(&ipvs->dest_trash_lock);
1263
1264         /* Queue up delayed work to expire all no destination connections.
1265          * No-op when CONFIG_SYSCTL is disabled.
1266          */
1267         if (!cleanup)
1268                 ip_vs_enqueue_expire_nodest_conns(ipvs);
1269 }
1270
1271
1272 /*
1273  *      Unlink a destination from the given service
1274  */
1275 static void __ip_vs_unlink_dest(struct ip_vs_service *svc,
1276                                 struct ip_vs_dest *dest,
1277                                 int svcupd)
1278 {
1279         dest->flags &= ~IP_VS_DEST_F_AVAILABLE;
1280
1281         /*
1282          *  Remove it from the d-linked destination list.
1283          */
1284         list_del_rcu(&dest->n_list);
1285         svc->num_dests--;
1286
1287         if (dest->af != svc->af)
1288                 svc->ipvs->mixed_address_family_dests--;
1289
1290         if (svcupd) {
1291                 struct ip_vs_scheduler *sched;
1292
1293                 sched = rcu_dereference_protected(svc->scheduler, 1);
1294                 if (sched && sched->del_dest)
1295                         sched->del_dest(svc, dest);
1296         }
1297 }
1298
1299
1300 /*
1301  *      Delete a destination server in the given service
1302  */
1303 static int
1304 ip_vs_del_dest(struct ip_vs_service *svc, struct ip_vs_dest_user_kern *udest)
1305 {
1306         struct ip_vs_dest *dest;
1307         __be16 dport = udest->port;
1308
1309         /* We use function that requires RCU lock */
1310         rcu_read_lock();
1311         dest = ip_vs_lookup_dest(svc, udest->af, &udest->addr, dport);
1312         rcu_read_unlock();
1313
1314         if (dest == NULL) {
1315                 IP_VS_DBG(1, "%s(): destination not found!\n", __func__);
1316                 return -ENOENT;
1317         }
1318
1319         /*
1320          *      Unlink dest from the service
1321          */
1322         __ip_vs_unlink_dest(svc, dest, 1);
1323
1324         /*
1325          *      Delete the destination
1326          */
1327         __ip_vs_del_dest(svc->ipvs, dest, false);
1328
1329         return 0;
1330 }
1331
1332 static void ip_vs_dest_trash_expire(struct timer_list *t)
1333 {
1334         struct netns_ipvs *ipvs = from_timer(ipvs, t, dest_trash_timer);
1335         struct ip_vs_dest *dest, *next;
1336         unsigned long now = jiffies;
1337
1338         spin_lock(&ipvs->dest_trash_lock);
1339         list_for_each_entry_safe(dest, next, &ipvs->dest_trash, t_list) {
1340                 if (refcount_read(&dest->refcnt) > 1)
1341                         continue;
1342                 if (dest->idle_start) {
1343                         if (time_before(now, dest->idle_start +
1344                                              IP_VS_DEST_TRASH_PERIOD))
1345                                 continue;
1346                 } else {
1347                         dest->idle_start = max(1UL, now);
1348                         continue;
1349                 }
1350                 IP_VS_DBG_BUF(3, "Removing destination %u/%s:%u from trash\n",
1351                               dest->vfwmark,
1352                               IP_VS_DBG_ADDR(dest->af, &dest->addr),
1353                               ntohs(dest->port));
1354                 list_del(&dest->t_list);
1355                 ip_vs_dest_free(dest);
1356         }
1357         if (!list_empty(&ipvs->dest_trash))
1358                 mod_timer(&ipvs->dest_trash_timer,
1359                           jiffies + (IP_VS_DEST_TRASH_PERIOD >> 1));
1360         spin_unlock(&ipvs->dest_trash_lock);
1361 }
1362
1363 /*
1364  *      Add a service into the service hash table
1365  */
1366 static int
1367 ip_vs_add_service(struct netns_ipvs *ipvs, struct ip_vs_service_user_kern *u,
1368                   struct ip_vs_service **svc_p)
1369 {
1370         int ret = 0;
1371         struct ip_vs_scheduler *sched = NULL;
1372         struct ip_vs_pe *pe = NULL;
1373         struct ip_vs_service *svc = NULL;
1374         int ret_hooks = -1;
1375
1376         /* increase the module use count */
1377         if (!ip_vs_use_count_inc())
1378                 return -ENOPROTOOPT;
1379
1380         /* Lookup the scheduler by 'u->sched_name' */
1381         if (strcmp(u->sched_name, "none")) {
1382                 sched = ip_vs_scheduler_get(u->sched_name);
1383                 if (!sched) {
1384                         pr_info("Scheduler module ip_vs_%s not found\n",
1385                                 u->sched_name);
1386                         ret = -ENOENT;
1387                         goto out_err;
1388                 }
1389         }
1390
1391         if (u->pe_name && *u->pe_name) {
1392                 pe = ip_vs_pe_getbyname(u->pe_name);
1393                 if (pe == NULL) {
1394                         pr_info("persistence engine module ip_vs_pe_%s "
1395                                 "not found\n", u->pe_name);
1396                         ret = -ENOENT;
1397                         goto out_err;
1398                 }
1399         }
1400
1401 #ifdef CONFIG_IP_VS_IPV6
1402         if (u->af == AF_INET6) {
1403                 __u32 plen = (__force __u32) u->netmask;
1404
1405                 if (plen < 1 || plen > 128) {
1406                         ret = -EINVAL;
1407                         goto out_err;
1408                 }
1409
1410                 ret = nf_defrag_ipv6_enable(ipvs->net);
1411                 if (ret)
1412                         goto out_err;
1413         }
1414 #endif
1415
1416         if ((u->af == AF_INET && !ipvs->num_services) ||
1417             (u->af == AF_INET6 && !ipvs->num_services6)) {
1418                 ret = ip_vs_register_hooks(ipvs, u->af);
1419                 if (ret < 0)
1420                         goto out_err;
1421                 ret_hooks = ret;
1422         }
1423
1424         svc = kzalloc(sizeof(struct ip_vs_service), GFP_KERNEL);
1425         if (svc == NULL) {
1426                 IP_VS_DBG(1, "%s(): no memory\n", __func__);
1427                 ret = -ENOMEM;
1428                 goto out_err;
1429         }
1430         ret = ip_vs_stats_init_alloc(&svc->stats);
1431         if (ret < 0)
1432                 goto out_err;
1433
1434         /* I'm the first user of the service */
1435         atomic_set(&svc->refcnt, 0);
1436
1437         svc->af = u->af;
1438         svc->protocol = u->protocol;
1439         ip_vs_addr_copy(svc->af, &svc->addr, &u->addr);
1440         svc->port = u->port;
1441         svc->fwmark = u->fwmark;
1442         svc->flags = u->flags & ~IP_VS_SVC_F_HASHED;
1443         svc->timeout = u->timeout * HZ;
1444         svc->netmask = u->netmask;
1445         svc->ipvs = ipvs;
1446
1447         INIT_LIST_HEAD(&svc->destinations);
1448         spin_lock_init(&svc->sched_lock);
1449
1450         /* Bind the scheduler */
1451         if (sched) {
1452                 ret = ip_vs_bind_scheduler(svc, sched);
1453                 if (ret)
1454                         goto out_err;
1455                 sched = NULL;
1456         }
1457
1458         ret = ip_vs_start_estimator(ipvs, &svc->stats);
1459         if (ret < 0)
1460                 goto out_err;
1461
1462         /* Bind the ct retriever */
1463         RCU_INIT_POINTER(svc->pe, pe);
1464         pe = NULL;
1465
1466         /* Update the virtual service counters */
1467         if (svc->port == FTPPORT)
1468                 atomic_inc(&ipvs->ftpsvc_counter);
1469         else if (svc->port == 0)
1470                 atomic_inc(&ipvs->nullsvc_counter);
1471         if (svc->pe && svc->pe->conn_out)
1472                 atomic_inc(&ipvs->conn_out_counter);
1473
1474         /* Count only IPv4 services for old get/setsockopt interface */
1475         if (svc->af == AF_INET)
1476                 ipvs->num_services++;
1477         else if (svc->af == AF_INET6)
1478                 ipvs->num_services6++;
1479
1480         /* Hash the service into the service table */
1481         ip_vs_svc_hash(svc);
1482
1483         *svc_p = svc;
1484
1485         if (!ipvs->enable) {
1486                 /* Now there is a service - full throttle */
1487                 ipvs->enable = 1;
1488
1489                 /* Start estimation for first time */
1490                 ip_vs_est_reload_start(ipvs);
1491         }
1492
1493         return 0;
1494
1495
1496  out_err:
1497         if (ret_hooks >= 0)
1498                 ip_vs_unregister_hooks(ipvs, u->af);
1499         if (svc != NULL) {
1500                 ip_vs_unbind_scheduler(svc, sched);
1501                 ip_vs_service_free(svc);
1502         }
1503         ip_vs_scheduler_put(sched);
1504         ip_vs_pe_put(pe);
1505
1506         /* decrease the module use count */
1507         ip_vs_use_count_dec();
1508
1509         return ret;
1510 }
1511
1512
1513 /*
1514  *      Edit a service and bind it with a new scheduler
1515  */
1516 static int
1517 ip_vs_edit_service(struct ip_vs_service *svc, struct ip_vs_service_user_kern *u)
1518 {
1519         struct ip_vs_scheduler *sched = NULL, *old_sched;
1520         struct ip_vs_pe *pe = NULL, *old_pe = NULL;
1521         int ret = 0;
1522         bool new_pe_conn_out, old_pe_conn_out;
1523
1524         /*
1525          * Lookup the scheduler, by 'u->sched_name'
1526          */
1527         if (strcmp(u->sched_name, "none")) {
1528                 sched = ip_vs_scheduler_get(u->sched_name);
1529                 if (!sched) {
1530                         pr_info("Scheduler module ip_vs_%s not found\n",
1531                                 u->sched_name);
1532                         return -ENOENT;
1533                 }
1534         }
1535         old_sched = sched;
1536
1537         if (u->pe_name && *u->pe_name) {
1538                 pe = ip_vs_pe_getbyname(u->pe_name);
1539                 if (pe == NULL) {
1540                         pr_info("persistence engine module ip_vs_pe_%s "
1541                                 "not found\n", u->pe_name);
1542                         ret = -ENOENT;
1543                         goto out;
1544                 }
1545                 old_pe = pe;
1546         }
1547
1548 #ifdef CONFIG_IP_VS_IPV6
1549         if (u->af == AF_INET6) {
1550                 __u32 plen = (__force __u32) u->netmask;
1551
1552                 if (plen < 1 || plen > 128) {
1553                         ret = -EINVAL;
1554                         goto out;
1555                 }
1556         }
1557 #endif
1558
1559         old_sched = rcu_dereference_protected(svc->scheduler, 1);
1560         if (sched != old_sched) {
1561                 if (old_sched) {
1562                         ip_vs_unbind_scheduler(svc, old_sched);
1563                         RCU_INIT_POINTER(svc->scheduler, NULL);
1564                         /* Wait all svc->sched_data users */
1565                         synchronize_rcu();
1566                 }
1567                 /* Bind the new scheduler */
1568                 if (sched) {
1569                         ret = ip_vs_bind_scheduler(svc, sched);
1570                         if (ret) {
1571                                 ip_vs_scheduler_put(sched);
1572                                 goto out;
1573                         }
1574                 }
1575         }
1576
1577         /*
1578          * Set the flags and timeout value
1579          */
1580         svc->flags = u->flags | IP_VS_SVC_F_HASHED;
1581         svc->timeout = u->timeout * HZ;
1582         svc->netmask = u->netmask;
1583
1584         old_pe = rcu_dereference_protected(svc->pe, 1);
1585         if (pe != old_pe) {
1586                 rcu_assign_pointer(svc->pe, pe);
1587                 /* check for optional methods in new pe */
1588                 new_pe_conn_out = (pe && pe->conn_out) ? true : false;
1589                 old_pe_conn_out = (old_pe && old_pe->conn_out) ? true : false;
1590                 if (new_pe_conn_out && !old_pe_conn_out)
1591                         atomic_inc(&svc->ipvs->conn_out_counter);
1592                 if (old_pe_conn_out && !new_pe_conn_out)
1593                         atomic_dec(&svc->ipvs->conn_out_counter);
1594         }
1595
1596 out:
1597         ip_vs_scheduler_put(old_sched);
1598         ip_vs_pe_put(old_pe);
1599         return ret;
1600 }
1601
1602 /*
1603  *      Delete a service from the service list
1604  *      - The service must be unlinked, unlocked and not referenced!
1605  *      - We are called under _bh lock
1606  */
1607 static void __ip_vs_del_service(struct ip_vs_service *svc, bool cleanup)
1608 {
1609         struct ip_vs_dest *dest, *nxt;
1610         struct ip_vs_scheduler *old_sched;
1611         struct ip_vs_pe *old_pe;
1612         struct netns_ipvs *ipvs = svc->ipvs;
1613
1614         if (svc->af == AF_INET) {
1615                 ipvs->num_services--;
1616                 if (!ipvs->num_services)
1617                         ip_vs_unregister_hooks(ipvs, svc->af);
1618         } else if (svc->af == AF_INET6) {
1619                 ipvs->num_services6--;
1620                 if (!ipvs->num_services6)
1621                         ip_vs_unregister_hooks(ipvs, svc->af);
1622         }
1623
1624         ip_vs_stop_estimator(svc->ipvs, &svc->stats);
1625
1626         /* Unbind scheduler */
1627         old_sched = rcu_dereference_protected(svc->scheduler, 1);
1628         ip_vs_unbind_scheduler(svc, old_sched);
1629         ip_vs_scheduler_put(old_sched);
1630
1631         /* Unbind persistence engine, keep svc->pe */
1632         old_pe = rcu_dereference_protected(svc->pe, 1);
1633         if (old_pe && old_pe->conn_out)
1634                 atomic_dec(&ipvs->conn_out_counter);
1635         ip_vs_pe_put(old_pe);
1636
1637         /*
1638          *    Unlink the whole destination list
1639          */
1640         list_for_each_entry_safe(dest, nxt, &svc->destinations, n_list) {
1641                 __ip_vs_unlink_dest(svc, dest, 0);
1642                 __ip_vs_del_dest(svc->ipvs, dest, cleanup);
1643         }
1644
1645         /*
1646          *    Update the virtual service counters
1647          */
1648         if (svc->port == FTPPORT)
1649                 atomic_dec(&ipvs->ftpsvc_counter);
1650         else if (svc->port == 0)
1651                 atomic_dec(&ipvs->nullsvc_counter);
1652
1653         /*
1654          *    Free the service if nobody refers to it
1655          */
1656         __ip_vs_svc_put(svc);
1657
1658         /* decrease the module use count */
1659         ip_vs_use_count_dec();
1660 }
1661
1662 /*
1663  * Unlink a service from list and try to delete it if its refcnt reached 0
1664  */
1665 static void ip_vs_unlink_service(struct ip_vs_service *svc, bool cleanup)
1666 {
1667         ip_vs_unregister_conntrack(svc);
1668         /* Hold svc to avoid double release from dest_trash */
1669         atomic_inc(&svc->refcnt);
1670         /*
1671          * Unhash it from the service table
1672          */
1673         ip_vs_svc_unhash(svc);
1674
1675         __ip_vs_del_service(svc, cleanup);
1676 }
1677
1678 /*
1679  *      Delete a service from the service list
1680  */
1681 static int ip_vs_del_service(struct ip_vs_service *svc)
1682 {
1683         if (svc == NULL)
1684                 return -EEXIST;
1685         ip_vs_unlink_service(svc, false);
1686
1687         return 0;
1688 }
1689
1690
1691 /*
1692  *      Flush all the virtual services
1693  */
1694 static int ip_vs_flush(struct netns_ipvs *ipvs, bool cleanup)
1695 {
1696         int idx;
1697         struct ip_vs_service *svc;
1698         struct hlist_node *n;
1699
1700         /*
1701          * Flush the service table hashed by <netns,protocol,addr,port>
1702          */
1703         for(idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
1704                 hlist_for_each_entry_safe(svc, n, &ip_vs_svc_table[idx],
1705                                           s_list) {
1706                         if (svc->ipvs == ipvs)
1707                                 ip_vs_unlink_service(svc, cleanup);
1708                 }
1709         }
1710
1711         /*
1712          * Flush the service table hashed by fwmark
1713          */
1714         for(idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
1715                 hlist_for_each_entry_safe(svc, n, &ip_vs_svc_fwm_table[idx],
1716                                           f_list) {
1717                         if (svc->ipvs == ipvs)
1718                                 ip_vs_unlink_service(svc, cleanup);
1719                 }
1720         }
1721
1722         return 0;
1723 }
1724
1725 /*
1726  *      Delete service by {netns} in the service table.
1727  *      Called by __ip_vs_batch_cleanup()
1728  */
1729 void ip_vs_service_nets_cleanup(struct list_head *net_list)
1730 {
1731         struct netns_ipvs *ipvs;
1732         struct net *net;
1733
1734         /* Check for "full" addressed entries */
1735         mutex_lock(&__ip_vs_mutex);
1736         list_for_each_entry(net, net_list, exit_list) {
1737                 ipvs = net_ipvs(net);
1738                 ip_vs_flush(ipvs, true);
1739         }
1740         mutex_unlock(&__ip_vs_mutex);
1741 }
1742
1743 /* Put all references for device (dst_cache) */
1744 static inline void
1745 ip_vs_forget_dev(struct ip_vs_dest *dest, struct net_device *dev)
1746 {
1747         struct ip_vs_dest_dst *dest_dst;
1748
1749         spin_lock_bh(&dest->dst_lock);
1750         dest_dst = rcu_dereference_protected(dest->dest_dst, 1);
1751         if (dest_dst && dest_dst->dst_cache->dev == dev) {
1752                 IP_VS_DBG_BUF(3, "Reset dev:%s dest %s:%u ,dest->refcnt=%d\n",
1753                               dev->name,
1754                               IP_VS_DBG_ADDR(dest->af, &dest->addr),
1755                               ntohs(dest->port),
1756                               refcount_read(&dest->refcnt));
1757                 __ip_vs_dst_cache_reset(dest);
1758         }
1759         spin_unlock_bh(&dest->dst_lock);
1760
1761 }
1762 /* Netdev event receiver
1763  * Currently only NETDEV_DOWN is handled to release refs to cached dsts
1764  */
1765 static int ip_vs_dst_event(struct notifier_block *this, unsigned long event,
1766                            void *ptr)
1767 {
1768         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1769         struct net *net = dev_net(dev);
1770         struct netns_ipvs *ipvs = net_ipvs(net);
1771         struct ip_vs_service *svc;
1772         struct ip_vs_dest *dest;
1773         unsigned int idx;
1774
1775         if (event != NETDEV_DOWN || !ipvs)
1776                 return NOTIFY_DONE;
1777         IP_VS_DBG(3, "%s() dev=%s\n", __func__, dev->name);
1778         mutex_lock(&__ip_vs_mutex);
1779         for (idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
1780                 hlist_for_each_entry(svc, &ip_vs_svc_table[idx], s_list) {
1781                         if (svc->ipvs == ipvs) {
1782                                 list_for_each_entry(dest, &svc->destinations,
1783                                                     n_list) {
1784                                         ip_vs_forget_dev(dest, dev);
1785                                 }
1786                         }
1787                 }
1788
1789                 hlist_for_each_entry(svc, &ip_vs_svc_fwm_table[idx], f_list) {
1790                         if (svc->ipvs == ipvs) {
1791                                 list_for_each_entry(dest, &svc->destinations,
1792                                                     n_list) {
1793                                         ip_vs_forget_dev(dest, dev);
1794                                 }
1795                         }
1796
1797                 }
1798         }
1799
1800         spin_lock_bh(&ipvs->dest_trash_lock);
1801         list_for_each_entry(dest, &ipvs->dest_trash, t_list) {
1802                 ip_vs_forget_dev(dest, dev);
1803         }
1804         spin_unlock_bh(&ipvs->dest_trash_lock);
1805         mutex_unlock(&__ip_vs_mutex);
1806         return NOTIFY_DONE;
1807 }
1808
1809 /*
1810  *      Zero counters in a service or all services
1811  */
1812 static int ip_vs_zero_service(struct ip_vs_service *svc)
1813 {
1814         struct ip_vs_dest *dest;
1815
1816         list_for_each_entry(dest, &svc->destinations, n_list) {
1817                 ip_vs_zero_stats(&dest->stats);
1818         }
1819         ip_vs_zero_stats(&svc->stats);
1820         return 0;
1821 }
1822
1823 static int ip_vs_zero_all(struct netns_ipvs *ipvs)
1824 {
1825         int idx;
1826         struct ip_vs_service *svc;
1827
1828         for(idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
1829                 hlist_for_each_entry(svc, &ip_vs_svc_table[idx], s_list) {
1830                         if (svc->ipvs == ipvs)
1831                                 ip_vs_zero_service(svc);
1832                 }
1833         }
1834
1835         for(idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
1836                 hlist_for_each_entry(svc, &ip_vs_svc_fwm_table[idx], f_list) {
1837                         if (svc->ipvs == ipvs)
1838                                 ip_vs_zero_service(svc);
1839                 }
1840         }
1841
1842         ip_vs_zero_stats(&ipvs->tot_stats->s);
1843         return 0;
1844 }
1845
1846 #ifdef CONFIG_SYSCTL
1847
1848 static int
1849 proc_do_defense_mode(struct ctl_table *table, int write,
1850                      void *buffer, size_t *lenp, loff_t *ppos)
1851 {
1852         struct netns_ipvs *ipvs = table->extra2;
1853         int *valp = table->data;
1854         int val = *valp;
1855         int rc;
1856
1857         struct ctl_table tmp = {
1858                 .data = &val,
1859                 .maxlen = sizeof(int),
1860                 .mode = table->mode,
1861         };
1862
1863         rc = proc_dointvec(&tmp, write, buffer, lenp, ppos);
1864         if (write && (*valp != val)) {
1865                 if (val < 0 || val > 3) {
1866                         rc = -EINVAL;
1867                 } else {
1868                         *valp = val;
1869                         update_defense_level(ipvs);
1870                 }
1871         }
1872         return rc;
1873 }
1874
1875 static int
1876 proc_do_sync_threshold(struct ctl_table *table, int write,
1877                        void *buffer, size_t *lenp, loff_t *ppos)
1878 {
1879         struct netns_ipvs *ipvs = table->extra2;
1880         int *valp = table->data;
1881         int val[2];
1882         int rc;
1883         struct ctl_table tmp = {
1884                 .data = &val,
1885                 .maxlen = table->maxlen,
1886                 .mode = table->mode,
1887         };
1888
1889         mutex_lock(&ipvs->sync_mutex);
1890         memcpy(val, valp, sizeof(val));
1891         rc = proc_dointvec(&tmp, write, buffer, lenp, ppos);
1892         if (write) {
1893                 if (val[0] < 0 || val[1] < 0 ||
1894                     (val[0] >= val[1] && val[1]))
1895                         rc = -EINVAL;
1896                 else
1897                         memcpy(valp, val, sizeof(val));
1898         }
1899         mutex_unlock(&ipvs->sync_mutex);
1900         return rc;
1901 }
1902
1903 static int
1904 proc_do_sync_ports(struct ctl_table *table, int write,
1905                    void *buffer, size_t *lenp, loff_t *ppos)
1906 {
1907         int *valp = table->data;
1908         int val = *valp;
1909         int rc;
1910
1911         struct ctl_table tmp = {
1912                 .data = &val,
1913                 .maxlen = sizeof(int),
1914                 .mode = table->mode,
1915         };
1916
1917         rc = proc_dointvec(&tmp, write, buffer, lenp, ppos);
1918         if (write && (*valp != val)) {
1919                 if (val < 1 || !is_power_of_2(val))
1920                         rc = -EINVAL;
1921                 else
1922                         *valp = val;
1923         }
1924         return rc;
1925 }
1926
1927 static int ipvs_proc_est_cpumask_set(struct ctl_table *table, void *buffer)
1928 {
1929         struct netns_ipvs *ipvs = table->extra2;
1930         cpumask_var_t *valp = table->data;
1931         cpumask_var_t newmask;
1932         int ret;
1933
1934         if (!zalloc_cpumask_var(&newmask, GFP_KERNEL))
1935                 return -ENOMEM;
1936
1937         ret = cpulist_parse(buffer, newmask);
1938         if (ret)
1939                 goto out;
1940
1941         mutex_lock(&ipvs->est_mutex);
1942
1943         if (!ipvs->est_cpulist_valid) {
1944                 if (!zalloc_cpumask_var(valp, GFP_KERNEL)) {
1945                         ret = -ENOMEM;
1946                         goto unlock;
1947                 }
1948                 ipvs->est_cpulist_valid = 1;
1949         }
1950         cpumask_and(newmask, newmask, &current->cpus_mask);
1951         cpumask_copy(*valp, newmask);
1952         /* est_max_threads may depend on cpulist size */
1953         ipvs->est_max_threads = ip_vs_est_max_threads(ipvs);
1954         ipvs->est_calc_phase = 1;
1955         ip_vs_est_reload_start(ipvs);
1956
1957 unlock:
1958         mutex_unlock(&ipvs->est_mutex);
1959
1960 out:
1961         free_cpumask_var(newmask);
1962         return ret;
1963 }
1964
1965 static int ipvs_proc_est_cpumask_get(struct ctl_table *table, void *buffer,
1966                                      size_t size)
1967 {
1968         struct netns_ipvs *ipvs = table->extra2;
1969         cpumask_var_t *valp = table->data;
1970         struct cpumask *mask;
1971         int ret;
1972
1973         mutex_lock(&ipvs->est_mutex);
1974
1975         if (ipvs->est_cpulist_valid)
1976                 mask = *valp;
1977         else
1978                 mask = (struct cpumask *)housekeeping_cpumask(HK_TYPE_KTHREAD);
1979         ret = scnprintf(buffer, size, "%*pbl\n", cpumask_pr_args(mask));
1980
1981         mutex_unlock(&ipvs->est_mutex);
1982
1983         return ret;
1984 }
1985
1986 static int ipvs_proc_est_cpulist(struct ctl_table *table, int write,
1987                                  void *buffer, size_t *lenp, loff_t *ppos)
1988 {
1989         int ret;
1990
1991         /* Ignore both read and write(append) if *ppos not 0 */
1992         if (*ppos || !*lenp) {
1993                 *lenp = 0;
1994                 return 0;
1995         }
1996         if (write) {
1997                 /* proc_sys_call_handler() appends terminator */
1998                 ret = ipvs_proc_est_cpumask_set(table, buffer);
1999                 if (ret >= 0)
2000                         *ppos += *lenp;
2001         } else {
2002                 /* proc_sys_call_handler() allocates 1 byte for terminator */
2003                 ret = ipvs_proc_est_cpumask_get(table, buffer, *lenp + 1);
2004                 if (ret >= 0) {
2005                         *lenp = ret;
2006                         *ppos += *lenp;
2007                         ret = 0;
2008                 }
2009         }
2010         return ret;
2011 }
2012
2013 static int ipvs_proc_est_nice(struct ctl_table *table, int write,
2014                               void *buffer, size_t *lenp, loff_t *ppos)
2015 {
2016         struct netns_ipvs *ipvs = table->extra2;
2017         int *valp = table->data;
2018         int val = *valp;
2019         int ret;
2020
2021         struct ctl_table tmp_table = {
2022                 .data = &val,
2023                 .maxlen = sizeof(int),
2024                 .mode = table->mode,
2025         };
2026
2027         ret = proc_dointvec(&tmp_table, write, buffer, lenp, ppos);
2028         if (write && ret >= 0) {
2029                 if (val < MIN_NICE || val > MAX_NICE) {
2030                         ret = -EINVAL;
2031                 } else {
2032                         mutex_lock(&ipvs->est_mutex);
2033                         if (*valp != val) {
2034                                 *valp = val;
2035                                 ip_vs_est_reload_start(ipvs);
2036                         }
2037                         mutex_unlock(&ipvs->est_mutex);
2038                 }
2039         }
2040         return ret;
2041 }
2042
2043 static int ipvs_proc_run_estimation(struct ctl_table *table, int write,
2044                                     void *buffer, size_t *lenp, loff_t *ppos)
2045 {
2046         struct netns_ipvs *ipvs = table->extra2;
2047         int *valp = table->data;
2048         int val = *valp;
2049         int ret;
2050
2051         struct ctl_table tmp_table = {
2052                 .data = &val,
2053                 .maxlen = sizeof(int),
2054                 .mode = table->mode,
2055         };
2056
2057         ret = proc_dointvec(&tmp_table, write, buffer, lenp, ppos);
2058         if (write && ret >= 0) {
2059                 mutex_lock(&ipvs->est_mutex);
2060                 if (*valp != val) {
2061                         *valp = val;
2062                         ip_vs_est_reload_start(ipvs);
2063                 }
2064                 mutex_unlock(&ipvs->est_mutex);
2065         }
2066         return ret;
2067 }
2068
2069 /*
2070  *      IPVS sysctl table (under the /proc/sys/net/ipv4/vs/)
2071  *      Do not change order or insert new entries without
2072  *      align with netns init in ip_vs_control_net_init()
2073  */
2074
2075 static struct ctl_table vs_vars[] = {
2076         {
2077                 .procname       = "amemthresh",
2078                 .maxlen         = sizeof(int),
2079                 .mode           = 0644,
2080                 .proc_handler   = proc_dointvec,
2081         },
2082         {
2083                 .procname       = "am_droprate",
2084                 .maxlen         = sizeof(int),
2085                 .mode           = 0644,
2086                 .proc_handler   = proc_dointvec,
2087         },
2088         {
2089                 .procname       = "drop_entry",
2090                 .maxlen         = sizeof(int),
2091                 .mode           = 0644,
2092                 .proc_handler   = proc_do_defense_mode,
2093         },
2094         {
2095                 .procname       = "drop_packet",
2096                 .maxlen         = sizeof(int),
2097                 .mode           = 0644,
2098                 .proc_handler   = proc_do_defense_mode,
2099         },
2100 #ifdef CONFIG_IP_VS_NFCT
2101         {
2102                 .procname       = "conntrack",
2103                 .maxlen         = sizeof(int),
2104                 .mode           = 0644,
2105                 .proc_handler   = &proc_dointvec,
2106         },
2107 #endif
2108         {
2109                 .procname       = "secure_tcp",
2110                 .maxlen         = sizeof(int),
2111                 .mode           = 0644,
2112                 .proc_handler   = proc_do_defense_mode,
2113         },
2114         {
2115                 .procname       = "snat_reroute",
2116                 .maxlen         = sizeof(int),
2117                 .mode           = 0644,
2118                 .proc_handler   = &proc_dointvec,
2119         },
2120         {
2121                 .procname       = "sync_version",
2122                 .maxlen         = sizeof(int),
2123                 .mode           = 0644,
2124                 .proc_handler   = proc_dointvec_minmax,
2125                 .extra1         = SYSCTL_ZERO,
2126                 .extra2         = SYSCTL_ONE,
2127         },
2128         {
2129                 .procname       = "sync_ports",
2130                 .maxlen         = sizeof(int),
2131                 .mode           = 0644,
2132                 .proc_handler   = proc_do_sync_ports,
2133         },
2134         {
2135                 .procname       = "sync_persist_mode",
2136                 .maxlen         = sizeof(int),
2137                 .mode           = 0644,
2138                 .proc_handler   = proc_dointvec,
2139         },
2140         {
2141                 .procname       = "sync_qlen_max",
2142                 .maxlen         = sizeof(unsigned long),
2143                 .mode           = 0644,
2144                 .proc_handler   = proc_doulongvec_minmax,
2145         },
2146         {
2147                 .procname       = "sync_sock_size",
2148                 .maxlen         = sizeof(int),
2149                 .mode           = 0644,
2150                 .proc_handler   = proc_dointvec,
2151         },
2152         {
2153                 .procname       = "cache_bypass",
2154                 .maxlen         = sizeof(int),
2155                 .mode           = 0644,
2156                 .proc_handler   = proc_dointvec,
2157         },
2158         {
2159                 .procname       = "expire_nodest_conn",
2160                 .maxlen         = sizeof(int),
2161                 .mode           = 0644,
2162                 .proc_handler   = proc_dointvec,
2163         },
2164         {
2165                 .procname       = "sloppy_tcp",
2166                 .maxlen         = sizeof(int),
2167                 .mode           = 0644,
2168                 .proc_handler   = proc_dointvec,
2169         },
2170         {
2171                 .procname       = "sloppy_sctp",
2172                 .maxlen         = sizeof(int),
2173                 .mode           = 0644,
2174                 .proc_handler   = proc_dointvec,
2175         },
2176         {
2177                 .procname       = "expire_quiescent_template",
2178                 .maxlen         = sizeof(int),
2179                 .mode           = 0644,
2180                 .proc_handler   = proc_dointvec,
2181         },
2182         {
2183                 .procname       = "sync_threshold",
2184                 .maxlen         =
2185                         sizeof(((struct netns_ipvs *)0)->sysctl_sync_threshold),
2186                 .mode           = 0644,
2187                 .proc_handler   = proc_do_sync_threshold,
2188         },
2189         {
2190                 .procname       = "sync_refresh_period",
2191                 .maxlen         = sizeof(int),
2192                 .mode           = 0644,
2193                 .proc_handler   = proc_dointvec_jiffies,
2194         },
2195         {
2196                 .procname       = "sync_retries",
2197                 .maxlen         = sizeof(int),
2198                 .mode           = 0644,
2199                 .proc_handler   = proc_dointvec_minmax,
2200                 .extra1         = SYSCTL_ZERO,
2201                 .extra2         = SYSCTL_THREE,
2202         },
2203         {
2204                 .procname       = "nat_icmp_send",
2205                 .maxlen         = sizeof(int),
2206                 .mode           = 0644,
2207                 .proc_handler   = proc_dointvec,
2208         },
2209         {
2210                 .procname       = "pmtu_disc",
2211                 .maxlen         = sizeof(int),
2212                 .mode           = 0644,
2213                 .proc_handler   = proc_dointvec,
2214         },
2215         {
2216                 .procname       = "backup_only",
2217                 .maxlen         = sizeof(int),
2218                 .mode           = 0644,
2219                 .proc_handler   = proc_dointvec,
2220         },
2221         {
2222                 .procname       = "conn_reuse_mode",
2223                 .maxlen         = sizeof(int),
2224                 .mode           = 0644,
2225                 .proc_handler   = proc_dointvec,
2226         },
2227         {
2228                 .procname       = "schedule_icmp",
2229                 .maxlen         = sizeof(int),
2230                 .mode           = 0644,
2231                 .proc_handler   = proc_dointvec,
2232         },
2233         {
2234                 .procname       = "ignore_tunneled",
2235                 .maxlen         = sizeof(int),
2236                 .mode           = 0644,
2237                 .proc_handler   = proc_dointvec,
2238         },
2239         {
2240                 .procname       = "run_estimation",
2241                 .maxlen         = sizeof(int),
2242                 .mode           = 0644,
2243                 .proc_handler   = ipvs_proc_run_estimation,
2244         },
2245         {
2246                 .procname       = "est_cpulist",
2247                 .maxlen         = NR_CPUS,      /* unused */
2248                 .mode           = 0644,
2249                 .proc_handler   = ipvs_proc_est_cpulist,
2250         },
2251         {
2252                 .procname       = "est_nice",
2253                 .maxlen         = sizeof(int),
2254                 .mode           = 0644,
2255                 .proc_handler   = ipvs_proc_est_nice,
2256         },
2257 #ifdef CONFIG_IP_VS_DEBUG
2258         {
2259                 .procname       = "debug_level",
2260                 .data           = &sysctl_ip_vs_debug_level,
2261                 .maxlen         = sizeof(int),
2262                 .mode           = 0644,
2263                 .proc_handler   = proc_dointvec,
2264         },
2265 #endif
2266         { }
2267 };
2268
2269 #endif
2270
2271 #ifdef CONFIG_PROC_FS
2272
2273 struct ip_vs_iter {
2274         struct seq_net_private p;  /* Do not move this, netns depends upon it*/
2275         struct hlist_head *table;
2276         int bucket;
2277 };
2278
2279 /*
2280  *      Write the contents of the VS rule table to a PROCfs file.
2281  *      (It is kept just for backward compatibility)
2282  */
2283 static inline const char *ip_vs_fwd_name(unsigned int flags)
2284 {
2285         switch (flags & IP_VS_CONN_F_FWD_MASK) {
2286         case IP_VS_CONN_F_LOCALNODE:
2287                 return "Local";
2288         case IP_VS_CONN_F_TUNNEL:
2289                 return "Tunnel";
2290         case IP_VS_CONN_F_DROUTE:
2291                 return "Route";
2292         default:
2293                 return "Masq";
2294         }
2295 }
2296
2297
2298 /* Get the Nth entry in the two lists */
2299 static struct ip_vs_service *ip_vs_info_array(struct seq_file *seq, loff_t pos)
2300 {
2301         struct net *net = seq_file_net(seq);
2302         struct netns_ipvs *ipvs = net_ipvs(net);
2303         struct ip_vs_iter *iter = seq->private;
2304         int idx;
2305         struct ip_vs_service *svc;
2306
2307         /* look in hash by protocol */
2308         for (idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
2309                 hlist_for_each_entry_rcu(svc, &ip_vs_svc_table[idx], s_list) {
2310                         if ((svc->ipvs == ipvs) && pos-- == 0) {
2311                                 iter->table = ip_vs_svc_table;
2312                                 iter->bucket = idx;
2313                                 return svc;
2314                         }
2315                 }
2316         }
2317
2318         /* keep looking in fwmark */
2319         for (idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
2320                 hlist_for_each_entry_rcu(svc, &ip_vs_svc_fwm_table[idx],
2321                                          f_list) {
2322                         if ((svc->ipvs == ipvs) && pos-- == 0) {
2323                                 iter->table = ip_vs_svc_fwm_table;
2324                                 iter->bucket = idx;
2325                                 return svc;
2326                         }
2327                 }
2328         }
2329
2330         return NULL;
2331 }
2332
2333 static void *ip_vs_info_seq_start(struct seq_file *seq, loff_t *pos)
2334         __acquires(RCU)
2335 {
2336         rcu_read_lock();
2337         return *pos ? ip_vs_info_array(seq, *pos - 1) : SEQ_START_TOKEN;
2338 }
2339
2340
2341 static void *ip_vs_info_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2342 {
2343         struct hlist_node *e;
2344         struct ip_vs_iter *iter;
2345         struct ip_vs_service *svc;
2346
2347         ++*pos;
2348         if (v == SEQ_START_TOKEN)
2349                 return ip_vs_info_array(seq,0);
2350
2351         svc = v;
2352         iter = seq->private;
2353
2354         if (iter->table == ip_vs_svc_table) {
2355                 /* next service in table hashed by protocol */
2356                 e = rcu_dereference(hlist_next_rcu(&svc->s_list));
2357                 if (e)
2358                         return hlist_entry(e, struct ip_vs_service, s_list);
2359
2360                 while (++iter->bucket < IP_VS_SVC_TAB_SIZE) {
2361                         hlist_for_each_entry_rcu(svc,
2362                                                  &ip_vs_svc_table[iter->bucket],
2363                                                  s_list) {
2364                                 return svc;
2365                         }
2366                 }
2367
2368                 iter->table = ip_vs_svc_fwm_table;
2369                 iter->bucket = -1;
2370                 goto scan_fwmark;
2371         }
2372
2373         /* next service in hashed by fwmark */
2374         e = rcu_dereference(hlist_next_rcu(&svc->f_list));
2375         if (e)
2376                 return hlist_entry(e, struct ip_vs_service, f_list);
2377
2378  scan_fwmark:
2379         while (++iter->bucket < IP_VS_SVC_TAB_SIZE) {
2380                 hlist_for_each_entry_rcu(svc,
2381                                          &ip_vs_svc_fwm_table[iter->bucket],
2382                                          f_list)
2383                         return svc;
2384         }
2385
2386         return NULL;
2387 }
2388
2389 static void ip_vs_info_seq_stop(struct seq_file *seq, void *v)
2390         __releases(RCU)
2391 {
2392         rcu_read_unlock();
2393 }
2394
2395
2396 static int ip_vs_info_seq_show(struct seq_file *seq, void *v)
2397 {
2398         if (v == SEQ_START_TOKEN) {
2399                 seq_printf(seq,
2400                         "IP Virtual Server version %d.%d.%d (size=%d)\n",
2401                         NVERSION(IP_VS_VERSION_CODE), ip_vs_conn_tab_size);
2402                 seq_puts(seq,
2403                          "Prot LocalAddress:Port Scheduler Flags\n");
2404                 seq_puts(seq,
2405                          "  -> RemoteAddress:Port Forward Weight ActiveConn InActConn\n");
2406         } else {
2407                 struct net *net = seq_file_net(seq);
2408                 struct netns_ipvs *ipvs = net_ipvs(net);
2409                 const struct ip_vs_service *svc = v;
2410                 const struct ip_vs_iter *iter = seq->private;
2411                 const struct ip_vs_dest *dest;
2412                 struct ip_vs_scheduler *sched = rcu_dereference(svc->scheduler);
2413                 char *sched_name = sched ? sched->name : "none";
2414
2415                 if (svc->ipvs != ipvs)
2416                         return 0;
2417                 if (iter->table == ip_vs_svc_table) {
2418 #ifdef CONFIG_IP_VS_IPV6
2419                         if (svc->af == AF_INET6)
2420                                 seq_printf(seq, "%s  [%pI6]:%04X %s ",
2421                                            ip_vs_proto_name(svc->protocol),
2422                                            &svc->addr.in6,
2423                                            ntohs(svc->port),
2424                                            sched_name);
2425                         else
2426 #endif
2427                                 seq_printf(seq, "%s  %08X:%04X %s %s ",
2428                                            ip_vs_proto_name(svc->protocol),
2429                                            ntohl(svc->addr.ip),
2430                                            ntohs(svc->port),
2431                                            sched_name,
2432                                            (svc->flags & IP_VS_SVC_F_ONEPACKET)?"ops ":"");
2433                 } else {
2434                         seq_printf(seq, "FWM  %08X %s %s",
2435                                    svc->fwmark, sched_name,
2436                                    (svc->flags & IP_VS_SVC_F_ONEPACKET)?"ops ":"");
2437                 }
2438
2439                 if (svc->flags & IP_VS_SVC_F_PERSISTENT)
2440                         seq_printf(seq, "persistent %d %08X\n",
2441                                 svc->timeout,
2442                                 ntohl(svc->netmask));
2443                 else
2444                         seq_putc(seq, '\n');
2445
2446                 list_for_each_entry_rcu(dest, &svc->destinations, n_list) {
2447 #ifdef CONFIG_IP_VS_IPV6
2448                         if (dest->af == AF_INET6)
2449                                 seq_printf(seq,
2450                                            "  -> [%pI6]:%04X"
2451                                            "      %-7s %-6d %-10d %-10d\n",
2452                                            &dest->addr.in6,
2453                                            ntohs(dest->port),
2454                                            ip_vs_fwd_name(atomic_read(&dest->conn_flags)),
2455                                            atomic_read(&dest->weight),
2456                                            atomic_read(&dest->activeconns),
2457                                            atomic_read(&dest->inactconns));
2458                         else
2459 #endif
2460                                 seq_printf(seq,
2461                                            "  -> %08X:%04X      "
2462                                            "%-7s %-6d %-10d %-10d\n",
2463                                            ntohl(dest->addr.ip),
2464                                            ntohs(dest->port),
2465                                            ip_vs_fwd_name(atomic_read(&dest->conn_flags)),
2466                                            atomic_read(&dest->weight),
2467                                            atomic_read(&dest->activeconns),
2468                                            atomic_read(&dest->inactconns));
2469
2470                 }
2471         }
2472         return 0;
2473 }
2474
2475 static const struct seq_operations ip_vs_info_seq_ops = {
2476         .start = ip_vs_info_seq_start,
2477         .next  = ip_vs_info_seq_next,
2478         .stop  = ip_vs_info_seq_stop,
2479         .show  = ip_vs_info_seq_show,
2480 };
2481
2482 static int ip_vs_stats_show(struct seq_file *seq, void *v)
2483 {
2484         struct net *net = seq_file_single_net(seq);
2485         struct ip_vs_kstats show;
2486
2487 /*               01234567 01234567 01234567 0123456701234567 0123456701234567 */
2488         seq_puts(seq,
2489                  "   Total Incoming Outgoing         Incoming         Outgoing\n");
2490         seq_puts(seq,
2491                  "   Conns  Packets  Packets            Bytes            Bytes\n");
2492
2493         ip_vs_copy_stats(&show, &net_ipvs(net)->tot_stats->s);
2494         seq_printf(seq, "%8LX %8LX %8LX %16LX %16LX\n\n",
2495                    (unsigned long long)show.conns,
2496                    (unsigned long long)show.inpkts,
2497                    (unsigned long long)show.outpkts,
2498                    (unsigned long long)show.inbytes,
2499                    (unsigned long long)show.outbytes);
2500
2501 /*                01234567 01234567 01234567 0123456701234567 0123456701234567*/
2502         seq_puts(seq,
2503                  " Conns/s   Pkts/s   Pkts/s          Bytes/s          Bytes/s\n");
2504         seq_printf(seq, "%8LX %8LX %8LX %16LX %16LX\n",
2505                    (unsigned long long)show.cps,
2506                    (unsigned long long)show.inpps,
2507                    (unsigned long long)show.outpps,
2508                    (unsigned long long)show.inbps,
2509                    (unsigned long long)show.outbps);
2510
2511         return 0;
2512 }
2513
2514 static int ip_vs_stats_percpu_show(struct seq_file *seq, void *v)
2515 {
2516         struct net *net = seq_file_single_net(seq);
2517         struct ip_vs_stats *tot_stats = &net_ipvs(net)->tot_stats->s;
2518         struct ip_vs_cpu_stats __percpu *cpustats = tot_stats->cpustats;
2519         struct ip_vs_kstats kstats;
2520         int i;
2521
2522 /*               01234567 01234567 01234567 0123456701234567 0123456701234567 */
2523         seq_puts(seq,
2524                  "       Total Incoming Outgoing         Incoming         Outgoing\n");
2525         seq_puts(seq,
2526                  "CPU    Conns  Packets  Packets            Bytes            Bytes\n");
2527
2528         for_each_possible_cpu(i) {
2529                 struct ip_vs_cpu_stats *u = per_cpu_ptr(cpustats, i);
2530                 unsigned int start;
2531                 u64 conns, inpkts, outpkts, inbytes, outbytes;
2532
2533                 do {
2534                         start = u64_stats_fetch_begin(&u->syncp);
2535                         conns = u64_stats_read(&u->cnt.conns);
2536                         inpkts = u64_stats_read(&u->cnt.inpkts);
2537                         outpkts = u64_stats_read(&u->cnt.outpkts);
2538                         inbytes = u64_stats_read(&u->cnt.inbytes);
2539                         outbytes = u64_stats_read(&u->cnt.outbytes);
2540                 } while (u64_stats_fetch_retry(&u->syncp, start));
2541
2542                 seq_printf(seq, "%3X %8LX %8LX %8LX %16LX %16LX\n",
2543                            i, (u64)conns, (u64)inpkts,
2544                            (u64)outpkts, (u64)inbytes,
2545                            (u64)outbytes);
2546         }
2547
2548         ip_vs_copy_stats(&kstats, tot_stats);
2549
2550         seq_printf(seq, "  ~ %8LX %8LX %8LX %16LX %16LX\n\n",
2551                    (unsigned long long)kstats.conns,
2552                    (unsigned long long)kstats.inpkts,
2553                    (unsigned long long)kstats.outpkts,
2554                    (unsigned long long)kstats.inbytes,
2555                    (unsigned long long)kstats.outbytes);
2556
2557 /*                ... 01234567 01234567 01234567 0123456701234567 0123456701234567 */
2558         seq_puts(seq,
2559                  "     Conns/s   Pkts/s   Pkts/s          Bytes/s          Bytes/s\n");
2560         seq_printf(seq, "    %8LX %8LX %8LX %16LX %16LX\n",
2561                    kstats.cps,
2562                    kstats.inpps,
2563                    kstats.outpps,
2564                    kstats.inbps,
2565                    kstats.outbps);
2566
2567         return 0;
2568 }
2569 #endif
2570
2571 /*
2572  *      Set timeout values for tcp tcpfin udp in the timeout_table.
2573  */
2574 static int ip_vs_set_timeout(struct netns_ipvs *ipvs, struct ip_vs_timeout_user *u)
2575 {
2576 #if defined(CONFIG_IP_VS_PROTO_TCP) || defined(CONFIG_IP_VS_PROTO_UDP)
2577         struct ip_vs_proto_data *pd;
2578 #endif
2579
2580         IP_VS_DBG(2, "Setting timeout tcp:%d tcpfin:%d udp:%d\n",
2581                   u->tcp_timeout,
2582                   u->tcp_fin_timeout,
2583                   u->udp_timeout);
2584
2585 #ifdef CONFIG_IP_VS_PROTO_TCP
2586         if (u->tcp_timeout < 0 || u->tcp_timeout > (INT_MAX / HZ) ||
2587             u->tcp_fin_timeout < 0 || u->tcp_fin_timeout > (INT_MAX / HZ)) {
2588                 return -EINVAL;
2589         }
2590 #endif
2591
2592 #ifdef CONFIG_IP_VS_PROTO_UDP
2593         if (u->udp_timeout < 0 || u->udp_timeout > (INT_MAX / HZ))
2594                 return -EINVAL;
2595 #endif
2596
2597 #ifdef CONFIG_IP_VS_PROTO_TCP
2598         if (u->tcp_timeout) {
2599                 pd = ip_vs_proto_data_get(ipvs, IPPROTO_TCP);
2600                 pd->timeout_table[IP_VS_TCP_S_ESTABLISHED]
2601                         = u->tcp_timeout * HZ;
2602         }
2603
2604         if (u->tcp_fin_timeout) {
2605                 pd = ip_vs_proto_data_get(ipvs, IPPROTO_TCP);
2606                 pd->timeout_table[IP_VS_TCP_S_FIN_WAIT]
2607                         = u->tcp_fin_timeout * HZ;
2608         }
2609 #endif
2610
2611 #ifdef CONFIG_IP_VS_PROTO_UDP
2612         if (u->udp_timeout) {
2613                 pd = ip_vs_proto_data_get(ipvs, IPPROTO_UDP);
2614                 pd->timeout_table[IP_VS_UDP_S_NORMAL]
2615                         = u->udp_timeout * HZ;
2616         }
2617 #endif
2618         return 0;
2619 }
2620
2621 #define CMDID(cmd)              (cmd - IP_VS_BASE_CTL)
2622
2623 struct ip_vs_svcdest_user {
2624         struct ip_vs_service_user       s;
2625         struct ip_vs_dest_user          d;
2626 };
2627
2628 static const unsigned char set_arglen[CMDID(IP_VS_SO_SET_MAX) + 1] = {
2629         [CMDID(IP_VS_SO_SET_ADD)]         = sizeof(struct ip_vs_service_user),
2630         [CMDID(IP_VS_SO_SET_EDIT)]        = sizeof(struct ip_vs_service_user),
2631         [CMDID(IP_VS_SO_SET_DEL)]         = sizeof(struct ip_vs_service_user),
2632         [CMDID(IP_VS_SO_SET_ADDDEST)]     = sizeof(struct ip_vs_svcdest_user),
2633         [CMDID(IP_VS_SO_SET_DELDEST)]     = sizeof(struct ip_vs_svcdest_user),
2634         [CMDID(IP_VS_SO_SET_EDITDEST)]    = sizeof(struct ip_vs_svcdest_user),
2635         [CMDID(IP_VS_SO_SET_TIMEOUT)]     = sizeof(struct ip_vs_timeout_user),
2636         [CMDID(IP_VS_SO_SET_STARTDAEMON)] = sizeof(struct ip_vs_daemon_user),
2637         [CMDID(IP_VS_SO_SET_STOPDAEMON)]  = sizeof(struct ip_vs_daemon_user),
2638         [CMDID(IP_VS_SO_SET_ZERO)]        = sizeof(struct ip_vs_service_user),
2639 };
2640
2641 union ip_vs_set_arglen {
2642         struct ip_vs_service_user       field_IP_VS_SO_SET_ADD;
2643         struct ip_vs_service_user       field_IP_VS_SO_SET_EDIT;
2644         struct ip_vs_service_user       field_IP_VS_SO_SET_DEL;
2645         struct ip_vs_svcdest_user       field_IP_VS_SO_SET_ADDDEST;
2646         struct ip_vs_svcdest_user       field_IP_VS_SO_SET_DELDEST;
2647         struct ip_vs_svcdest_user       field_IP_VS_SO_SET_EDITDEST;
2648         struct ip_vs_timeout_user       field_IP_VS_SO_SET_TIMEOUT;
2649         struct ip_vs_daemon_user        field_IP_VS_SO_SET_STARTDAEMON;
2650         struct ip_vs_daemon_user        field_IP_VS_SO_SET_STOPDAEMON;
2651         struct ip_vs_service_user       field_IP_VS_SO_SET_ZERO;
2652 };
2653
2654 #define MAX_SET_ARGLEN  sizeof(union ip_vs_set_arglen)
2655
2656 static void ip_vs_copy_usvc_compat(struct ip_vs_service_user_kern *usvc,
2657                                   struct ip_vs_service_user *usvc_compat)
2658 {
2659         memset(usvc, 0, sizeof(*usvc));
2660
2661         usvc->af                = AF_INET;
2662         usvc->protocol          = usvc_compat->protocol;
2663         usvc->addr.ip           = usvc_compat->addr;
2664         usvc->port              = usvc_compat->port;
2665         usvc->fwmark            = usvc_compat->fwmark;
2666
2667         /* Deep copy of sched_name is not needed here */
2668         usvc->sched_name        = usvc_compat->sched_name;
2669
2670         usvc->flags             = usvc_compat->flags;
2671         usvc->timeout           = usvc_compat->timeout;
2672         usvc->netmask           = usvc_compat->netmask;
2673 }
2674
2675 static void ip_vs_copy_udest_compat(struct ip_vs_dest_user_kern *udest,
2676                                    struct ip_vs_dest_user *udest_compat)
2677 {
2678         memset(udest, 0, sizeof(*udest));
2679
2680         udest->addr.ip          = udest_compat->addr;
2681         udest->port             = udest_compat->port;
2682         udest->conn_flags       = udest_compat->conn_flags;
2683         udest->weight           = udest_compat->weight;
2684         udest->u_threshold      = udest_compat->u_threshold;
2685         udest->l_threshold      = udest_compat->l_threshold;
2686         udest->af               = AF_INET;
2687         udest->tun_type         = IP_VS_CONN_F_TUNNEL_TYPE_IPIP;
2688 }
2689
2690 static int
2691 do_ip_vs_set_ctl(struct sock *sk, int cmd, sockptr_t ptr, unsigned int len)
2692 {
2693         struct net *net = sock_net(sk);
2694         int ret;
2695         unsigned char arg[MAX_SET_ARGLEN];
2696         struct ip_vs_service_user *usvc_compat;
2697         struct ip_vs_service_user_kern usvc;
2698         struct ip_vs_service *svc;
2699         struct ip_vs_dest_user *udest_compat;
2700         struct ip_vs_dest_user_kern udest;
2701         struct netns_ipvs *ipvs = net_ipvs(net);
2702
2703         BUILD_BUG_ON(sizeof(arg) > 255);
2704         if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
2705                 return -EPERM;
2706
2707         if (cmd < IP_VS_BASE_CTL || cmd > IP_VS_SO_SET_MAX)
2708                 return -EINVAL;
2709         if (len != set_arglen[CMDID(cmd)]) {
2710                 IP_VS_DBG(1, "set_ctl: len %u != %u\n",
2711                           len, set_arglen[CMDID(cmd)]);
2712                 return -EINVAL;
2713         }
2714
2715         if (copy_from_sockptr(arg, ptr, len) != 0)
2716                 return -EFAULT;
2717
2718         /* Handle daemons since they have another lock */
2719         if (cmd == IP_VS_SO_SET_STARTDAEMON ||
2720             cmd == IP_VS_SO_SET_STOPDAEMON) {
2721                 struct ip_vs_daemon_user *dm = (struct ip_vs_daemon_user *)arg;
2722
2723                 if (cmd == IP_VS_SO_SET_STARTDAEMON) {
2724                         struct ipvs_sync_daemon_cfg cfg;
2725
2726                         memset(&cfg, 0, sizeof(cfg));
2727                         ret = -EINVAL;
2728                         if (strscpy(cfg.mcast_ifn, dm->mcast_ifn,
2729                                     sizeof(cfg.mcast_ifn)) <= 0)
2730                                 return ret;
2731                         cfg.syncid = dm->syncid;
2732                         ret = start_sync_thread(ipvs, &cfg, dm->state);
2733                 } else {
2734                         ret = stop_sync_thread(ipvs, dm->state);
2735                 }
2736                 return ret;
2737         }
2738
2739         mutex_lock(&__ip_vs_mutex);
2740         if (cmd == IP_VS_SO_SET_FLUSH) {
2741                 /* Flush the virtual service */
2742                 ret = ip_vs_flush(ipvs, false);
2743                 goto out_unlock;
2744         } else if (cmd == IP_VS_SO_SET_TIMEOUT) {
2745                 /* Set timeout values for (tcp tcpfin udp) */
2746                 ret = ip_vs_set_timeout(ipvs, (struct ip_vs_timeout_user *)arg);
2747                 goto out_unlock;
2748         } else if (!len) {
2749                 /* No more commands with len == 0 below */
2750                 ret = -EINVAL;
2751                 goto out_unlock;
2752         }
2753
2754         usvc_compat = (struct ip_vs_service_user *)arg;
2755         udest_compat = (struct ip_vs_dest_user *)(usvc_compat + 1);
2756
2757         /* We only use the new structs internally, so copy userspace compat
2758          * structs to extended internal versions */
2759         ip_vs_copy_usvc_compat(&usvc, usvc_compat);
2760         ip_vs_copy_udest_compat(&udest, udest_compat);
2761
2762         if (cmd == IP_VS_SO_SET_ZERO) {
2763                 /* if no service address is set, zero counters in all */
2764                 if (!usvc.fwmark && !usvc.addr.ip && !usvc.port) {
2765                         ret = ip_vs_zero_all(ipvs);
2766                         goto out_unlock;
2767                 }
2768         }
2769
2770         if ((cmd == IP_VS_SO_SET_ADD || cmd == IP_VS_SO_SET_EDIT) &&
2771             strnlen(usvc.sched_name, IP_VS_SCHEDNAME_MAXLEN) ==
2772             IP_VS_SCHEDNAME_MAXLEN) {
2773                 ret = -EINVAL;
2774                 goto out_unlock;
2775         }
2776
2777         /* Check for valid protocol: TCP or UDP or SCTP, even for fwmark!=0 */
2778         if (usvc.protocol != IPPROTO_TCP && usvc.protocol != IPPROTO_UDP &&
2779             usvc.protocol != IPPROTO_SCTP) {
2780                 pr_err("set_ctl: invalid protocol: %d %pI4:%d\n",
2781                        usvc.protocol, &usvc.addr.ip,
2782                        ntohs(usvc.port));
2783                 ret = -EFAULT;
2784                 goto out_unlock;
2785         }
2786
2787         /* Lookup the exact service by <protocol, addr, port> or fwmark */
2788         rcu_read_lock();
2789         if (usvc.fwmark == 0)
2790                 svc = __ip_vs_service_find(ipvs, usvc.af, usvc.protocol,
2791                                            &usvc.addr, usvc.port);
2792         else
2793                 svc = __ip_vs_svc_fwm_find(ipvs, usvc.af, usvc.fwmark);
2794         rcu_read_unlock();
2795
2796         if (cmd != IP_VS_SO_SET_ADD
2797             && (svc == NULL || svc->protocol != usvc.protocol)) {
2798                 ret = -ESRCH;
2799                 goto out_unlock;
2800         }
2801
2802         switch (cmd) {
2803         case IP_VS_SO_SET_ADD:
2804                 if (svc != NULL)
2805                         ret = -EEXIST;
2806                 else
2807                         ret = ip_vs_add_service(ipvs, &usvc, &svc);
2808                 break;
2809         case IP_VS_SO_SET_EDIT:
2810                 ret = ip_vs_edit_service(svc, &usvc);
2811                 break;
2812         case IP_VS_SO_SET_DEL:
2813                 ret = ip_vs_del_service(svc);
2814                 if (!ret)
2815                         goto out_unlock;
2816                 break;
2817         case IP_VS_SO_SET_ZERO:
2818                 ret = ip_vs_zero_service(svc);
2819                 break;
2820         case IP_VS_SO_SET_ADDDEST:
2821                 ret = ip_vs_add_dest(svc, &udest);
2822                 break;
2823         case IP_VS_SO_SET_EDITDEST:
2824                 ret = ip_vs_edit_dest(svc, &udest);
2825                 break;
2826         case IP_VS_SO_SET_DELDEST:
2827                 ret = ip_vs_del_dest(svc, &udest);
2828                 break;
2829         default:
2830                 WARN_ON_ONCE(1);
2831                 ret = -EINVAL;
2832                 break;
2833         }
2834
2835   out_unlock:
2836         mutex_unlock(&__ip_vs_mutex);
2837         return ret;
2838 }
2839
2840
2841 static void
2842 ip_vs_copy_service(struct ip_vs_service_entry *dst, struct ip_vs_service *src)
2843 {
2844         struct ip_vs_scheduler *sched;
2845         struct ip_vs_kstats kstats;
2846         char *sched_name;
2847
2848         sched = rcu_dereference_protected(src->scheduler, 1);
2849         sched_name = sched ? sched->name : "none";
2850         dst->protocol = src->protocol;
2851         dst->addr = src->addr.ip;
2852         dst->port = src->port;
2853         dst->fwmark = src->fwmark;
2854         strscpy(dst->sched_name, sched_name, sizeof(dst->sched_name));
2855         dst->flags = src->flags;
2856         dst->timeout = src->timeout / HZ;
2857         dst->netmask = src->netmask;
2858         dst->num_dests = src->num_dests;
2859         ip_vs_copy_stats(&kstats, &src->stats);
2860         ip_vs_export_stats_user(&dst->stats, &kstats);
2861 }
2862
2863 static inline int
2864 __ip_vs_get_service_entries(struct netns_ipvs *ipvs,
2865                             const struct ip_vs_get_services *get,
2866                             struct ip_vs_get_services __user *uptr)
2867 {
2868         int idx, count=0;
2869         struct ip_vs_service *svc;
2870         struct ip_vs_service_entry entry;
2871         int ret = 0;
2872
2873         for (idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
2874                 hlist_for_each_entry(svc, &ip_vs_svc_table[idx], s_list) {
2875                         /* Only expose IPv4 entries to old interface */
2876                         if (svc->af != AF_INET || (svc->ipvs != ipvs))
2877                                 continue;
2878
2879                         if (count >= get->num_services)
2880                                 goto out;
2881                         memset(&entry, 0, sizeof(entry));
2882                         ip_vs_copy_service(&entry, svc);
2883                         if (copy_to_user(&uptr->entrytable[count],
2884                                          &entry, sizeof(entry))) {
2885                                 ret = -EFAULT;
2886                                 goto out;
2887                         }
2888                         count++;
2889                 }
2890         }
2891
2892         for (idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
2893                 hlist_for_each_entry(svc, &ip_vs_svc_fwm_table[idx], f_list) {
2894                         /* Only expose IPv4 entries to old interface */
2895                         if (svc->af != AF_INET || (svc->ipvs != ipvs))
2896                                 continue;
2897
2898                         if (count >= get->num_services)
2899                                 goto out;
2900                         memset(&entry, 0, sizeof(entry));
2901                         ip_vs_copy_service(&entry, svc);
2902                         if (copy_to_user(&uptr->entrytable[count],
2903                                          &entry, sizeof(entry))) {
2904                                 ret = -EFAULT;
2905                                 goto out;
2906                         }
2907                         count++;
2908                 }
2909         }
2910 out:
2911         return ret;
2912 }
2913
2914 static inline int
2915 __ip_vs_get_dest_entries(struct netns_ipvs *ipvs, const struct ip_vs_get_dests *get,
2916                          struct ip_vs_get_dests __user *uptr)
2917 {
2918         struct ip_vs_service *svc;
2919         union nf_inet_addr addr = { .ip = get->addr };
2920         int ret = 0;
2921
2922         rcu_read_lock();
2923         if (get->fwmark)
2924                 svc = __ip_vs_svc_fwm_find(ipvs, AF_INET, get->fwmark);
2925         else
2926                 svc = __ip_vs_service_find(ipvs, AF_INET, get->protocol, &addr,
2927                                            get->port);
2928         rcu_read_unlock();
2929
2930         if (svc) {
2931                 int count = 0;
2932                 struct ip_vs_dest *dest;
2933                 struct ip_vs_dest_entry entry;
2934                 struct ip_vs_kstats kstats;
2935
2936                 memset(&entry, 0, sizeof(entry));
2937                 list_for_each_entry(dest, &svc->destinations, n_list) {
2938                         if (count >= get->num_dests)
2939                                 break;
2940
2941                         /* Cannot expose heterogeneous members via sockopt
2942                          * interface
2943                          */
2944                         if (dest->af != svc->af)
2945                                 continue;
2946
2947                         entry.addr = dest->addr.ip;
2948                         entry.port = dest->port;
2949                         entry.conn_flags = atomic_read(&dest->conn_flags);
2950                         entry.weight = atomic_read(&dest->weight);
2951                         entry.u_threshold = dest->u_threshold;
2952                         entry.l_threshold = dest->l_threshold;
2953                         entry.activeconns = atomic_read(&dest->activeconns);
2954                         entry.inactconns = atomic_read(&dest->inactconns);
2955                         entry.persistconns = atomic_read(&dest->persistconns);
2956                         ip_vs_copy_stats(&kstats, &dest->stats);
2957                         ip_vs_export_stats_user(&entry.stats, &kstats);
2958                         if (copy_to_user(&uptr->entrytable[count],
2959                                          &entry, sizeof(entry))) {
2960                                 ret = -EFAULT;
2961                                 break;
2962                         }
2963                         count++;
2964                 }
2965         } else
2966                 ret = -ESRCH;
2967         return ret;
2968 }
2969
2970 static inline void
2971 __ip_vs_get_timeouts(struct netns_ipvs *ipvs, struct ip_vs_timeout_user *u)
2972 {
2973 #if defined(CONFIG_IP_VS_PROTO_TCP) || defined(CONFIG_IP_VS_PROTO_UDP)
2974         struct ip_vs_proto_data *pd;
2975 #endif
2976
2977         memset(u, 0, sizeof (*u));
2978
2979 #ifdef CONFIG_IP_VS_PROTO_TCP
2980         pd = ip_vs_proto_data_get(ipvs, IPPROTO_TCP);
2981         u->tcp_timeout = pd->timeout_table[IP_VS_TCP_S_ESTABLISHED] / HZ;
2982         u->tcp_fin_timeout = pd->timeout_table[IP_VS_TCP_S_FIN_WAIT] / HZ;
2983 #endif
2984 #ifdef CONFIG_IP_VS_PROTO_UDP
2985         pd = ip_vs_proto_data_get(ipvs, IPPROTO_UDP);
2986         u->udp_timeout =
2987                         pd->timeout_table[IP_VS_UDP_S_NORMAL] / HZ;
2988 #endif
2989 }
2990
2991 static const unsigned char get_arglen[CMDID(IP_VS_SO_GET_MAX) + 1] = {
2992         [CMDID(IP_VS_SO_GET_VERSION)]  = 64,
2993         [CMDID(IP_VS_SO_GET_INFO)]     = sizeof(struct ip_vs_getinfo),
2994         [CMDID(IP_VS_SO_GET_SERVICES)] = sizeof(struct ip_vs_get_services),
2995         [CMDID(IP_VS_SO_GET_SERVICE)]  = sizeof(struct ip_vs_service_entry),
2996         [CMDID(IP_VS_SO_GET_DESTS)]    = sizeof(struct ip_vs_get_dests),
2997         [CMDID(IP_VS_SO_GET_TIMEOUT)]  = sizeof(struct ip_vs_timeout_user),
2998         [CMDID(IP_VS_SO_GET_DAEMON)]   = 2 * sizeof(struct ip_vs_daemon_user),
2999 };
3000
3001 union ip_vs_get_arglen {
3002         char                            field_IP_VS_SO_GET_VERSION[64];
3003         struct ip_vs_getinfo            field_IP_VS_SO_GET_INFO;
3004         struct ip_vs_get_services       field_IP_VS_SO_GET_SERVICES;
3005         struct ip_vs_service_entry      field_IP_VS_SO_GET_SERVICE;
3006         struct ip_vs_get_dests          field_IP_VS_SO_GET_DESTS;
3007         struct ip_vs_timeout_user       field_IP_VS_SO_GET_TIMEOUT;
3008         struct ip_vs_daemon_user        field_IP_VS_SO_GET_DAEMON[2];
3009 };
3010
3011 #define MAX_GET_ARGLEN  sizeof(union ip_vs_get_arglen)
3012
3013 static int
3014 do_ip_vs_get_ctl(struct sock *sk, int cmd, void __user *user, int *len)
3015 {
3016         unsigned char arg[MAX_GET_ARGLEN];
3017         int ret = 0;
3018         unsigned int copylen;
3019         struct net *net = sock_net(sk);
3020         struct netns_ipvs *ipvs = net_ipvs(net);
3021
3022         BUG_ON(!net);
3023         BUILD_BUG_ON(sizeof(arg) > 255);
3024         if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
3025                 return -EPERM;
3026
3027         if (cmd < IP_VS_BASE_CTL || cmd > IP_VS_SO_GET_MAX)
3028                 return -EINVAL;
3029
3030         copylen = get_arglen[CMDID(cmd)];
3031         if (*len < (int) copylen) {
3032                 IP_VS_DBG(1, "get_ctl: len %d < %u\n", *len, copylen);
3033                 return -EINVAL;
3034         }
3035
3036         if (copy_from_user(arg, user, copylen) != 0)
3037                 return -EFAULT;
3038         /*
3039          * Handle daemons first since it has its own locking
3040          */
3041         if (cmd == IP_VS_SO_GET_DAEMON) {
3042                 struct ip_vs_daemon_user d[2];
3043
3044                 memset(&d, 0, sizeof(d));
3045                 mutex_lock(&ipvs->sync_mutex);
3046                 if (ipvs->sync_state & IP_VS_STATE_MASTER) {
3047                         d[0].state = IP_VS_STATE_MASTER;
3048                         strscpy(d[0].mcast_ifn, ipvs->mcfg.mcast_ifn,
3049                                 sizeof(d[0].mcast_ifn));
3050                         d[0].syncid = ipvs->mcfg.syncid;
3051                 }
3052                 if (ipvs->sync_state & IP_VS_STATE_BACKUP) {
3053                         d[1].state = IP_VS_STATE_BACKUP;
3054                         strscpy(d[1].mcast_ifn, ipvs->bcfg.mcast_ifn,
3055                                 sizeof(d[1].mcast_ifn));
3056                         d[1].syncid = ipvs->bcfg.syncid;
3057                 }
3058                 if (copy_to_user(user, &d, sizeof(d)) != 0)
3059                         ret = -EFAULT;
3060                 mutex_unlock(&ipvs->sync_mutex);
3061                 return ret;
3062         }
3063
3064         mutex_lock(&__ip_vs_mutex);
3065         switch (cmd) {
3066         case IP_VS_SO_GET_VERSION:
3067         {
3068                 char buf[64];
3069
3070                 sprintf(buf, "IP Virtual Server version %d.%d.%d (size=%d)",
3071                         NVERSION(IP_VS_VERSION_CODE), ip_vs_conn_tab_size);
3072                 if (copy_to_user(user, buf, strlen(buf)+1) != 0) {
3073                         ret = -EFAULT;
3074                         goto out;
3075                 }
3076                 *len = strlen(buf)+1;
3077         }
3078         break;
3079
3080         case IP_VS_SO_GET_INFO:
3081         {
3082                 struct ip_vs_getinfo info;
3083                 info.version = IP_VS_VERSION_CODE;
3084                 info.size = ip_vs_conn_tab_size;
3085                 info.num_services = ipvs->num_services;
3086                 if (copy_to_user(user, &info, sizeof(info)) != 0)
3087                         ret = -EFAULT;
3088         }
3089         break;
3090
3091         case IP_VS_SO_GET_SERVICES:
3092         {
3093                 struct ip_vs_get_services *get;
3094                 int size;
3095
3096                 get = (struct ip_vs_get_services *)arg;
3097                 size = struct_size(get, entrytable, get->num_services);
3098                 if (*len != size) {
3099                         pr_err("length: %u != %u\n", *len, size);
3100                         ret = -EINVAL;
3101                         goto out;
3102                 }
3103                 ret = __ip_vs_get_service_entries(ipvs, get, user);
3104         }
3105         break;
3106
3107         case IP_VS_SO_GET_SERVICE:
3108         {
3109                 struct ip_vs_service_entry *entry;
3110                 struct ip_vs_service *svc;
3111                 union nf_inet_addr addr;
3112
3113                 entry = (struct ip_vs_service_entry *)arg;
3114                 addr.ip = entry->addr;
3115                 rcu_read_lock();
3116                 if (entry->fwmark)
3117                         svc = __ip_vs_svc_fwm_find(ipvs, AF_INET, entry->fwmark);
3118                 else
3119                         svc = __ip_vs_service_find(ipvs, AF_INET,
3120                                                    entry->protocol, &addr,
3121                                                    entry->port);
3122                 rcu_read_unlock();
3123                 if (svc) {
3124                         ip_vs_copy_service(entry, svc);
3125                         if (copy_to_user(user, entry, sizeof(*entry)) != 0)
3126                                 ret = -EFAULT;
3127                 } else
3128                         ret = -ESRCH;
3129         }
3130         break;
3131
3132         case IP_VS_SO_GET_DESTS:
3133         {
3134                 struct ip_vs_get_dests *get;
3135                 int size;
3136
3137                 get = (struct ip_vs_get_dests *)arg;
3138                 size = struct_size(get, entrytable, get->num_dests);
3139                 if (*len != size) {
3140                         pr_err("length: %u != %u\n", *len, size);
3141                         ret = -EINVAL;
3142                         goto out;
3143                 }
3144                 ret = __ip_vs_get_dest_entries(ipvs, get, user);
3145         }
3146         break;
3147
3148         case IP_VS_SO_GET_TIMEOUT:
3149         {
3150                 struct ip_vs_timeout_user t;
3151
3152                 __ip_vs_get_timeouts(ipvs, &t);
3153                 if (copy_to_user(user, &t, sizeof(t)) != 0)
3154                         ret = -EFAULT;
3155         }
3156         break;
3157
3158         default:
3159                 ret = -EINVAL;
3160         }
3161
3162 out:
3163         mutex_unlock(&__ip_vs_mutex);
3164         return ret;
3165 }
3166
3167
3168 static struct nf_sockopt_ops ip_vs_sockopts = {
3169         .pf             = PF_INET,
3170         .set_optmin     = IP_VS_BASE_CTL,
3171         .set_optmax     = IP_VS_SO_SET_MAX+1,
3172         .set            = do_ip_vs_set_ctl,
3173         .get_optmin     = IP_VS_BASE_CTL,
3174         .get_optmax     = IP_VS_SO_GET_MAX+1,
3175         .get            = do_ip_vs_get_ctl,
3176         .owner          = THIS_MODULE,
3177 };
3178
3179 /*
3180  * Generic Netlink interface
3181  */
3182
3183 /* IPVS genetlink family */
3184 static struct genl_family ip_vs_genl_family;
3185
3186 /* Policy used for first-level command attributes */
3187 static const struct nla_policy ip_vs_cmd_policy[IPVS_CMD_ATTR_MAX + 1] = {
3188         [IPVS_CMD_ATTR_SERVICE]         = { .type = NLA_NESTED },
3189         [IPVS_CMD_ATTR_DEST]            = { .type = NLA_NESTED },
3190         [IPVS_CMD_ATTR_DAEMON]          = { .type = NLA_NESTED },
3191         [IPVS_CMD_ATTR_TIMEOUT_TCP]     = { .type = NLA_U32 },
3192         [IPVS_CMD_ATTR_TIMEOUT_TCP_FIN] = { .type = NLA_U32 },
3193         [IPVS_CMD_ATTR_TIMEOUT_UDP]     = { .type = NLA_U32 },
3194 };
3195
3196 /* Policy used for attributes in nested attribute IPVS_CMD_ATTR_DAEMON */
3197 static const struct nla_policy ip_vs_daemon_policy[IPVS_DAEMON_ATTR_MAX + 1] = {
3198         [IPVS_DAEMON_ATTR_STATE]        = { .type = NLA_U32 },
3199         [IPVS_DAEMON_ATTR_MCAST_IFN]    = { .type = NLA_NUL_STRING,
3200                                             .len = IP_VS_IFNAME_MAXLEN - 1 },
3201         [IPVS_DAEMON_ATTR_SYNC_ID]      = { .type = NLA_U32 },
3202         [IPVS_DAEMON_ATTR_SYNC_MAXLEN]  = { .type = NLA_U16 },
3203         [IPVS_DAEMON_ATTR_MCAST_GROUP]  = { .type = NLA_U32 },
3204         [IPVS_DAEMON_ATTR_MCAST_GROUP6] = { .len = sizeof(struct in6_addr) },
3205         [IPVS_DAEMON_ATTR_MCAST_PORT]   = { .type = NLA_U16 },
3206         [IPVS_DAEMON_ATTR_MCAST_TTL]    = { .type = NLA_U8 },
3207 };
3208
3209 /* Policy used for attributes in nested attribute IPVS_CMD_ATTR_SERVICE */
3210 static const struct nla_policy ip_vs_svc_policy[IPVS_SVC_ATTR_MAX + 1] = {
3211         [IPVS_SVC_ATTR_AF]              = { .type = NLA_U16 },
3212         [IPVS_SVC_ATTR_PROTOCOL]        = { .type = NLA_U16 },
3213         [IPVS_SVC_ATTR_ADDR]            = { .type = NLA_BINARY,
3214                                             .len = sizeof(union nf_inet_addr) },
3215         [IPVS_SVC_ATTR_PORT]            = { .type = NLA_U16 },
3216         [IPVS_SVC_ATTR_FWMARK]          = { .type = NLA_U32 },
3217         [IPVS_SVC_ATTR_SCHED_NAME]      = { .type = NLA_NUL_STRING,
3218                                             .len = IP_VS_SCHEDNAME_MAXLEN - 1 },
3219         [IPVS_SVC_ATTR_PE_NAME]         = { .type = NLA_NUL_STRING,
3220                                             .len = IP_VS_PENAME_MAXLEN },
3221         [IPVS_SVC_ATTR_FLAGS]           = { .type = NLA_BINARY,
3222                                             .len = sizeof(struct ip_vs_flags) },
3223         [IPVS_SVC_ATTR_TIMEOUT]         = { .type = NLA_U32 },
3224         [IPVS_SVC_ATTR_NETMASK]         = { .type = NLA_U32 },
3225         [IPVS_SVC_ATTR_STATS]           = { .type = NLA_NESTED },
3226 };
3227
3228 /* Policy used for attributes in nested attribute IPVS_CMD_ATTR_DEST */
3229 static const struct nla_policy ip_vs_dest_policy[IPVS_DEST_ATTR_MAX + 1] = {
3230         [IPVS_DEST_ATTR_ADDR]           = { .type = NLA_BINARY,
3231                                             .len = sizeof(union nf_inet_addr) },
3232         [IPVS_DEST_ATTR_PORT]           = { .type = NLA_U16 },
3233         [IPVS_DEST_ATTR_FWD_METHOD]     = { .type = NLA_U32 },
3234         [IPVS_DEST_ATTR_WEIGHT]         = { .type = NLA_U32 },
3235         [IPVS_DEST_ATTR_U_THRESH]       = { .type = NLA_U32 },
3236         [IPVS_DEST_ATTR_L_THRESH]       = { .type = NLA_U32 },
3237         [IPVS_DEST_ATTR_ACTIVE_CONNS]   = { .type = NLA_U32 },
3238         [IPVS_DEST_ATTR_INACT_CONNS]    = { .type = NLA_U32 },
3239         [IPVS_DEST_ATTR_PERSIST_CONNS]  = { .type = NLA_U32 },
3240         [IPVS_DEST_ATTR_STATS]          = { .type = NLA_NESTED },
3241         [IPVS_DEST_ATTR_ADDR_FAMILY]    = { .type = NLA_U16 },
3242         [IPVS_DEST_ATTR_TUN_TYPE]       = { .type = NLA_U8 },
3243         [IPVS_DEST_ATTR_TUN_PORT]       = { .type = NLA_U16 },
3244         [IPVS_DEST_ATTR_TUN_FLAGS]      = { .type = NLA_U16 },
3245 };
3246
3247 static int ip_vs_genl_fill_stats(struct sk_buff *skb, int container_type,
3248                                  struct ip_vs_kstats *kstats)
3249 {
3250         struct nlattr *nl_stats = nla_nest_start_noflag(skb, container_type);
3251
3252         if (!nl_stats)
3253                 return -EMSGSIZE;
3254
3255         if (nla_put_u32(skb, IPVS_STATS_ATTR_CONNS, (u32)kstats->conns) ||
3256             nla_put_u32(skb, IPVS_STATS_ATTR_INPKTS, (u32)kstats->inpkts) ||
3257             nla_put_u32(skb, IPVS_STATS_ATTR_OUTPKTS, (u32)kstats->outpkts) ||
3258             nla_put_u64_64bit(skb, IPVS_STATS_ATTR_INBYTES, kstats->inbytes,
3259                               IPVS_STATS_ATTR_PAD) ||
3260             nla_put_u64_64bit(skb, IPVS_STATS_ATTR_OUTBYTES, kstats->outbytes,
3261                               IPVS_STATS_ATTR_PAD) ||
3262             nla_put_u32(skb, IPVS_STATS_ATTR_CPS, (u32)kstats->cps) ||
3263             nla_put_u32(skb, IPVS_STATS_ATTR_INPPS, (u32)kstats->inpps) ||
3264             nla_put_u32(skb, IPVS_STATS_ATTR_OUTPPS, (u32)kstats->outpps) ||
3265             nla_put_u32(skb, IPVS_STATS_ATTR_INBPS, (u32)kstats->inbps) ||
3266             nla_put_u32(skb, IPVS_STATS_ATTR_OUTBPS, (u32)kstats->outbps))
3267                 goto nla_put_failure;
3268         nla_nest_end(skb, nl_stats);
3269
3270         return 0;
3271
3272 nla_put_failure:
3273         nla_nest_cancel(skb, nl_stats);
3274         return -EMSGSIZE;
3275 }
3276
3277 static int ip_vs_genl_fill_stats64(struct sk_buff *skb, int container_type,
3278                                    struct ip_vs_kstats *kstats)
3279 {
3280         struct nlattr *nl_stats = nla_nest_start_noflag(skb, container_type);
3281
3282         if (!nl_stats)
3283                 return -EMSGSIZE;
3284
3285         if (nla_put_u64_64bit(skb, IPVS_STATS_ATTR_CONNS, kstats->conns,
3286                               IPVS_STATS_ATTR_PAD) ||
3287             nla_put_u64_64bit(skb, IPVS_STATS_ATTR_INPKTS, kstats->inpkts,
3288                               IPVS_STATS_ATTR_PAD) ||
3289             nla_put_u64_64bit(skb, IPVS_STATS_ATTR_OUTPKTS, kstats->outpkts,
3290                               IPVS_STATS_ATTR_PAD) ||
3291             nla_put_u64_64bit(skb, IPVS_STATS_ATTR_INBYTES, kstats->inbytes,
3292                               IPVS_STATS_ATTR_PAD) ||
3293             nla_put_u64_64bit(skb, IPVS_STATS_ATTR_OUTBYTES, kstats->outbytes,
3294                               IPVS_STATS_ATTR_PAD) ||
3295             nla_put_u64_64bit(skb, IPVS_STATS_ATTR_CPS, kstats->cps,
3296                               IPVS_STATS_ATTR_PAD) ||
3297             nla_put_u64_64bit(skb, IPVS_STATS_ATTR_INPPS, kstats->inpps,
3298                               IPVS_STATS_ATTR_PAD) ||
3299             nla_put_u64_64bit(skb, IPVS_STATS_ATTR_OUTPPS, kstats->outpps,
3300                               IPVS_STATS_ATTR_PAD) ||
3301             nla_put_u64_64bit(skb, IPVS_STATS_ATTR_INBPS, kstats->inbps,
3302                               IPVS_STATS_ATTR_PAD) ||
3303             nla_put_u64_64bit(skb, IPVS_STATS_ATTR_OUTBPS, kstats->outbps,
3304                               IPVS_STATS_ATTR_PAD))
3305                 goto nla_put_failure;
3306         nla_nest_end(skb, nl_stats);
3307
3308         return 0;
3309
3310 nla_put_failure:
3311         nla_nest_cancel(skb, nl_stats);
3312         return -EMSGSIZE;
3313 }
3314
3315 static int ip_vs_genl_fill_service(struct sk_buff *skb,
3316                                    struct ip_vs_service *svc)
3317 {
3318         struct ip_vs_scheduler *sched;
3319         struct ip_vs_pe *pe;
3320         struct nlattr *nl_service;
3321         struct ip_vs_flags flags = { .flags = svc->flags,
3322                                      .mask = ~0 };
3323         struct ip_vs_kstats kstats;
3324         char *sched_name;
3325
3326         nl_service = nla_nest_start_noflag(skb, IPVS_CMD_ATTR_SERVICE);
3327         if (!nl_service)
3328                 return -EMSGSIZE;
3329
3330         if (nla_put_u16(skb, IPVS_SVC_ATTR_AF, svc->af))
3331                 goto nla_put_failure;
3332         if (svc->fwmark) {
3333                 if (nla_put_u32(skb, IPVS_SVC_ATTR_FWMARK, svc->fwmark))
3334                         goto nla_put_failure;
3335         } else {
3336                 if (nla_put_u16(skb, IPVS_SVC_ATTR_PROTOCOL, svc->protocol) ||
3337                     nla_put(skb, IPVS_SVC_ATTR_ADDR, sizeof(svc->addr), &svc->addr) ||
3338                     nla_put_be16(skb, IPVS_SVC_ATTR_PORT, svc->port))
3339                         goto nla_put_failure;
3340         }
3341
3342         sched = rcu_dereference_protected(svc->scheduler, 1);
3343         sched_name = sched ? sched->name : "none";
3344         pe = rcu_dereference_protected(svc->pe, 1);
3345         if (nla_put_string(skb, IPVS_SVC_ATTR_SCHED_NAME, sched_name) ||
3346             (pe && nla_put_string(skb, IPVS_SVC_ATTR_PE_NAME, pe->name)) ||
3347             nla_put(skb, IPVS_SVC_ATTR_FLAGS, sizeof(flags), &flags) ||
3348             nla_put_u32(skb, IPVS_SVC_ATTR_TIMEOUT, svc->timeout / HZ) ||
3349             nla_put_be32(skb, IPVS_SVC_ATTR_NETMASK, svc->netmask))
3350                 goto nla_put_failure;
3351         ip_vs_copy_stats(&kstats, &svc->stats);
3352         if (ip_vs_genl_fill_stats(skb, IPVS_SVC_ATTR_STATS, &kstats))
3353                 goto nla_put_failure;
3354         if (ip_vs_genl_fill_stats64(skb, IPVS_SVC_ATTR_STATS64, &kstats))
3355                 goto nla_put_failure;
3356
3357         nla_nest_end(skb, nl_service);
3358
3359         return 0;
3360
3361 nla_put_failure:
3362         nla_nest_cancel(skb, nl_service);
3363         return -EMSGSIZE;
3364 }
3365
3366 static int ip_vs_genl_dump_service(struct sk_buff *skb,
3367                                    struct ip_vs_service *svc,
3368                                    struct netlink_callback *cb)
3369 {
3370         void *hdr;
3371
3372         hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
3373                           &ip_vs_genl_family, NLM_F_MULTI,
3374                           IPVS_CMD_NEW_SERVICE);
3375         if (!hdr)
3376                 return -EMSGSIZE;
3377
3378         if (ip_vs_genl_fill_service(skb, svc) < 0)
3379                 goto nla_put_failure;
3380
3381         genlmsg_end(skb, hdr);
3382         return 0;
3383
3384 nla_put_failure:
3385         genlmsg_cancel(skb, hdr);
3386         return -EMSGSIZE;
3387 }
3388
3389 static int ip_vs_genl_dump_services(struct sk_buff *skb,
3390                                     struct netlink_callback *cb)
3391 {
3392         int idx = 0, i;
3393         int start = cb->args[0];
3394         struct ip_vs_service *svc;
3395         struct net *net = sock_net(skb->sk);
3396         struct netns_ipvs *ipvs = net_ipvs(net);
3397
3398         mutex_lock(&__ip_vs_mutex);
3399         for (i = 0; i < IP_VS_SVC_TAB_SIZE; i++) {
3400                 hlist_for_each_entry(svc, &ip_vs_svc_table[i], s_list) {
3401                         if (++idx <= start || (svc->ipvs != ipvs))
3402                                 continue;
3403                         if (ip_vs_genl_dump_service(skb, svc, cb) < 0) {
3404                                 idx--;
3405                                 goto nla_put_failure;
3406                         }
3407                 }
3408         }
3409
3410         for (i = 0; i < IP_VS_SVC_TAB_SIZE; i++) {
3411                 hlist_for_each_entry(svc, &ip_vs_svc_fwm_table[i], f_list) {
3412                         if (++idx <= start || (svc->ipvs != ipvs))
3413                                 continue;
3414                         if (ip_vs_genl_dump_service(skb, svc, cb) < 0) {
3415                                 idx--;
3416                                 goto nla_put_failure;
3417                         }
3418                 }
3419         }
3420
3421 nla_put_failure:
3422         mutex_unlock(&__ip_vs_mutex);
3423         cb->args[0] = idx;
3424
3425         return skb->len;
3426 }
3427
3428 static bool ip_vs_is_af_valid(int af)
3429 {
3430         if (af == AF_INET)
3431                 return true;
3432 #ifdef CONFIG_IP_VS_IPV6
3433         if (af == AF_INET6 && ipv6_mod_enabled())
3434                 return true;
3435 #endif
3436         return false;
3437 }
3438
3439 static int ip_vs_genl_parse_service(struct netns_ipvs *ipvs,
3440                                     struct ip_vs_service_user_kern *usvc,
3441                                     struct nlattr *nla, bool full_entry,
3442                                     struct ip_vs_service **ret_svc)
3443 {
3444         struct nlattr *attrs[IPVS_SVC_ATTR_MAX + 1];
3445         struct nlattr *nla_af, *nla_port, *nla_fwmark, *nla_protocol, *nla_addr;
3446         struct ip_vs_service *svc;
3447
3448         /* Parse mandatory identifying service fields first */
3449         if (nla == NULL ||
3450             nla_parse_nested_deprecated(attrs, IPVS_SVC_ATTR_MAX, nla, ip_vs_svc_policy, NULL))
3451                 return -EINVAL;
3452
3453         nla_af          = attrs[IPVS_SVC_ATTR_AF];
3454         nla_protocol    = attrs[IPVS_SVC_ATTR_PROTOCOL];
3455         nla_addr        = attrs[IPVS_SVC_ATTR_ADDR];
3456         nla_port        = attrs[IPVS_SVC_ATTR_PORT];
3457         nla_fwmark      = attrs[IPVS_SVC_ATTR_FWMARK];
3458
3459         if (!(nla_af && (nla_fwmark || (nla_port && nla_protocol && nla_addr))))
3460                 return -EINVAL;
3461
3462         memset(usvc, 0, sizeof(*usvc));
3463
3464         usvc->af = nla_get_u16(nla_af);
3465         if (!ip_vs_is_af_valid(usvc->af))
3466                 return -EAFNOSUPPORT;
3467
3468         if (nla_fwmark) {
3469                 usvc->protocol = IPPROTO_TCP;
3470                 usvc->fwmark = nla_get_u32(nla_fwmark);
3471         } else {
3472                 usvc->protocol = nla_get_u16(nla_protocol);
3473                 nla_memcpy(&usvc->addr, nla_addr, sizeof(usvc->addr));
3474                 usvc->port = nla_get_be16(nla_port);
3475                 usvc->fwmark = 0;
3476         }
3477
3478         rcu_read_lock();
3479         if (usvc->fwmark)
3480                 svc = __ip_vs_svc_fwm_find(ipvs, usvc->af, usvc->fwmark);
3481         else
3482                 svc = __ip_vs_service_find(ipvs, usvc->af, usvc->protocol,
3483                                            &usvc->addr, usvc->port);
3484         rcu_read_unlock();
3485         *ret_svc = svc;
3486
3487         /* If a full entry was requested, check for the additional fields */
3488         if (full_entry) {
3489                 struct nlattr *nla_sched, *nla_flags, *nla_pe, *nla_timeout,
3490                               *nla_netmask;
3491                 struct ip_vs_flags flags;
3492
3493                 nla_sched = attrs[IPVS_SVC_ATTR_SCHED_NAME];
3494                 nla_pe = attrs[IPVS_SVC_ATTR_PE_NAME];
3495                 nla_flags = attrs[IPVS_SVC_ATTR_FLAGS];
3496                 nla_timeout = attrs[IPVS_SVC_ATTR_TIMEOUT];
3497                 nla_netmask = attrs[IPVS_SVC_ATTR_NETMASK];
3498
3499                 if (!(nla_sched && nla_flags && nla_timeout && nla_netmask))
3500                         return -EINVAL;
3501
3502                 nla_memcpy(&flags, nla_flags, sizeof(flags));
3503
3504                 /* prefill flags from service if it already exists */
3505                 if (svc)
3506                         usvc->flags = svc->flags;
3507
3508                 /* set new flags from userland */
3509                 usvc->flags = (usvc->flags & ~flags.mask) |
3510                               (flags.flags & flags.mask);
3511                 usvc->sched_name = nla_data(nla_sched);
3512                 usvc->pe_name = nla_pe ? nla_data(nla_pe) : NULL;
3513                 usvc->timeout = nla_get_u32(nla_timeout);
3514                 usvc->netmask = nla_get_be32(nla_netmask);
3515         }
3516
3517         return 0;
3518 }
3519
3520 static struct ip_vs_service *ip_vs_genl_find_service(struct netns_ipvs *ipvs,
3521                                                      struct nlattr *nla)
3522 {
3523         struct ip_vs_service_user_kern usvc;
3524         struct ip_vs_service *svc;
3525         int ret;
3526
3527         ret = ip_vs_genl_parse_service(ipvs, &usvc, nla, false, &svc);
3528         return ret ? ERR_PTR(ret) : svc;
3529 }
3530
3531 static int ip_vs_genl_fill_dest(struct sk_buff *skb, struct ip_vs_dest *dest)
3532 {
3533         struct nlattr *nl_dest;
3534         struct ip_vs_kstats kstats;
3535
3536         nl_dest = nla_nest_start_noflag(skb, IPVS_CMD_ATTR_DEST);
3537         if (!nl_dest)
3538                 return -EMSGSIZE;
3539
3540         if (nla_put(skb, IPVS_DEST_ATTR_ADDR, sizeof(dest->addr), &dest->addr) ||
3541             nla_put_be16(skb, IPVS_DEST_ATTR_PORT, dest->port) ||
3542             nla_put_u32(skb, IPVS_DEST_ATTR_FWD_METHOD,
3543                         (atomic_read(&dest->conn_flags) &
3544                          IP_VS_CONN_F_FWD_MASK)) ||
3545             nla_put_u32(skb, IPVS_DEST_ATTR_WEIGHT,
3546                         atomic_read(&dest->weight)) ||
3547             nla_put_u8(skb, IPVS_DEST_ATTR_TUN_TYPE,
3548                        dest->tun_type) ||
3549             nla_put_be16(skb, IPVS_DEST_ATTR_TUN_PORT,
3550                          dest->tun_port) ||
3551             nla_put_u16(skb, IPVS_DEST_ATTR_TUN_FLAGS,
3552                         dest->tun_flags) ||
3553             nla_put_u32(skb, IPVS_DEST_ATTR_U_THRESH, dest->u_threshold) ||
3554             nla_put_u32(skb, IPVS_DEST_ATTR_L_THRESH, dest->l_threshold) ||
3555             nla_put_u32(skb, IPVS_DEST_ATTR_ACTIVE_CONNS,
3556                         atomic_read(&dest->activeconns)) ||
3557             nla_put_u32(skb, IPVS_DEST_ATTR_INACT_CONNS,
3558                         atomic_read(&dest->inactconns)) ||
3559             nla_put_u32(skb, IPVS_DEST_ATTR_PERSIST_CONNS,
3560                         atomic_read(&dest->persistconns)) ||
3561             nla_put_u16(skb, IPVS_DEST_ATTR_ADDR_FAMILY, dest->af))
3562                 goto nla_put_failure;
3563         ip_vs_copy_stats(&kstats, &dest->stats);
3564         if (ip_vs_genl_fill_stats(skb, IPVS_DEST_ATTR_STATS, &kstats))
3565                 goto nla_put_failure;
3566         if (ip_vs_genl_fill_stats64(skb, IPVS_DEST_ATTR_STATS64, &kstats))
3567                 goto nla_put_failure;
3568
3569         nla_nest_end(skb, nl_dest);
3570
3571         return 0;
3572
3573 nla_put_failure:
3574         nla_nest_cancel(skb, nl_dest);
3575         return -EMSGSIZE;
3576 }
3577
3578 static int ip_vs_genl_dump_dest(struct sk_buff *skb, struct ip_vs_dest *dest,
3579                                 struct netlink_callback *cb)
3580 {
3581         void *hdr;
3582
3583         hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
3584                           &ip_vs_genl_family, NLM_F_MULTI,
3585                           IPVS_CMD_NEW_DEST);
3586         if (!hdr)
3587                 return -EMSGSIZE;
3588
3589         if (ip_vs_genl_fill_dest(skb, dest) < 0)
3590                 goto nla_put_failure;
3591
3592         genlmsg_end(skb, hdr);
3593         return 0;
3594
3595 nla_put_failure:
3596         genlmsg_cancel(skb, hdr);
3597         return -EMSGSIZE;
3598 }
3599
3600 static int ip_vs_genl_dump_dests(struct sk_buff *skb,
3601                                  struct netlink_callback *cb)
3602 {
3603         int idx = 0;
3604         int start = cb->args[0];
3605         struct ip_vs_service *svc;
3606         struct ip_vs_dest *dest;
3607         struct nlattr *attrs[IPVS_CMD_ATTR_MAX + 1];
3608         struct net *net = sock_net(skb->sk);
3609         struct netns_ipvs *ipvs = net_ipvs(net);
3610
3611         mutex_lock(&__ip_vs_mutex);
3612
3613         /* Try to find the service for which to dump destinations */
3614         if (nlmsg_parse_deprecated(cb->nlh, GENL_HDRLEN, attrs, IPVS_CMD_ATTR_MAX, ip_vs_cmd_policy, cb->extack))
3615                 goto out_err;
3616
3617
3618         svc = ip_vs_genl_find_service(ipvs, attrs[IPVS_CMD_ATTR_SERVICE]);
3619         if (IS_ERR_OR_NULL(svc))
3620                 goto out_err;
3621
3622         /* Dump the destinations */
3623         list_for_each_entry(dest, &svc->destinations, n_list) {
3624                 if (++idx <= start)
3625                         continue;
3626                 if (ip_vs_genl_dump_dest(skb, dest, cb) < 0) {
3627                         idx--;
3628                         goto nla_put_failure;
3629                 }
3630         }
3631
3632 nla_put_failure:
3633         cb->args[0] = idx;
3634
3635 out_err:
3636         mutex_unlock(&__ip_vs_mutex);
3637
3638         return skb->len;
3639 }
3640
3641 static int ip_vs_genl_parse_dest(struct ip_vs_dest_user_kern *udest,
3642                                  struct nlattr *nla, bool full_entry)
3643 {
3644         struct nlattr *attrs[IPVS_DEST_ATTR_MAX + 1];
3645         struct nlattr *nla_addr, *nla_port;
3646         struct nlattr *nla_addr_family;
3647
3648         /* Parse mandatory identifying destination fields first */
3649         if (nla == NULL ||
3650             nla_parse_nested_deprecated(attrs, IPVS_DEST_ATTR_MAX, nla, ip_vs_dest_policy, NULL))
3651                 return -EINVAL;
3652
3653         nla_addr        = attrs[IPVS_DEST_ATTR_ADDR];
3654         nla_port        = attrs[IPVS_DEST_ATTR_PORT];
3655         nla_addr_family = attrs[IPVS_DEST_ATTR_ADDR_FAMILY];
3656
3657         if (!(nla_addr && nla_port))
3658                 return -EINVAL;
3659
3660         memset(udest, 0, sizeof(*udest));
3661
3662         nla_memcpy(&udest->addr, nla_addr, sizeof(udest->addr));
3663         udest->port = nla_get_be16(nla_port);
3664
3665         if (nla_addr_family)
3666                 udest->af = nla_get_u16(nla_addr_family);
3667         else
3668                 udest->af = 0;
3669
3670         /* If a full entry was requested, check for the additional fields */
3671         if (full_entry) {
3672                 struct nlattr *nla_fwd, *nla_weight, *nla_u_thresh,
3673                               *nla_l_thresh, *nla_tun_type, *nla_tun_port,
3674                               *nla_tun_flags;
3675
3676                 nla_fwd         = attrs[IPVS_DEST_ATTR_FWD_METHOD];
3677                 nla_weight      = attrs[IPVS_DEST_ATTR_WEIGHT];
3678                 nla_u_thresh    = attrs[IPVS_DEST_ATTR_U_THRESH];
3679                 nla_l_thresh    = attrs[IPVS_DEST_ATTR_L_THRESH];
3680                 nla_tun_type    = attrs[IPVS_DEST_ATTR_TUN_TYPE];
3681                 nla_tun_port    = attrs[IPVS_DEST_ATTR_TUN_PORT];
3682                 nla_tun_flags   = attrs[IPVS_DEST_ATTR_TUN_FLAGS];
3683
3684                 if (!(nla_fwd && nla_weight && nla_u_thresh && nla_l_thresh))
3685                         return -EINVAL;
3686
3687                 udest->conn_flags = nla_get_u32(nla_fwd)
3688                                     & IP_VS_CONN_F_FWD_MASK;
3689                 udest->weight = nla_get_u32(nla_weight);
3690                 udest->u_threshold = nla_get_u32(nla_u_thresh);
3691                 udest->l_threshold = nla_get_u32(nla_l_thresh);
3692
3693                 if (nla_tun_type)
3694                         udest->tun_type = nla_get_u8(nla_tun_type);
3695
3696                 if (nla_tun_port)
3697                         udest->tun_port = nla_get_be16(nla_tun_port);
3698
3699                 if (nla_tun_flags)
3700                         udest->tun_flags = nla_get_u16(nla_tun_flags);
3701         }
3702
3703         return 0;
3704 }
3705
3706 static int ip_vs_genl_fill_daemon(struct sk_buff *skb, __u32 state,
3707                                   struct ipvs_sync_daemon_cfg *c)
3708 {
3709         struct nlattr *nl_daemon;
3710
3711         nl_daemon = nla_nest_start_noflag(skb, IPVS_CMD_ATTR_DAEMON);
3712         if (!nl_daemon)
3713                 return -EMSGSIZE;
3714
3715         if (nla_put_u32(skb, IPVS_DAEMON_ATTR_STATE, state) ||
3716             nla_put_string(skb, IPVS_DAEMON_ATTR_MCAST_IFN, c->mcast_ifn) ||
3717             nla_put_u32(skb, IPVS_DAEMON_ATTR_SYNC_ID, c->syncid) ||
3718             nla_put_u16(skb, IPVS_DAEMON_ATTR_SYNC_MAXLEN, c->sync_maxlen) ||
3719             nla_put_u16(skb, IPVS_DAEMON_ATTR_MCAST_PORT, c->mcast_port) ||
3720             nla_put_u8(skb, IPVS_DAEMON_ATTR_MCAST_TTL, c->mcast_ttl))
3721                 goto nla_put_failure;
3722 #ifdef CONFIG_IP_VS_IPV6
3723         if (c->mcast_af == AF_INET6) {
3724                 if (nla_put_in6_addr(skb, IPVS_DAEMON_ATTR_MCAST_GROUP6,
3725                                      &c->mcast_group.in6))
3726                         goto nla_put_failure;
3727         } else
3728 #endif
3729                 if (c->mcast_af == AF_INET &&
3730                     nla_put_in_addr(skb, IPVS_DAEMON_ATTR_MCAST_GROUP,
3731                                     c->mcast_group.ip))
3732                         goto nla_put_failure;
3733         nla_nest_end(skb, nl_daemon);
3734
3735         return 0;
3736
3737 nla_put_failure:
3738         nla_nest_cancel(skb, nl_daemon);
3739         return -EMSGSIZE;
3740 }
3741
3742 static int ip_vs_genl_dump_daemon(struct sk_buff *skb, __u32 state,
3743                                   struct ipvs_sync_daemon_cfg *c,
3744                                   struct netlink_callback *cb)
3745 {
3746         void *hdr;
3747         hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
3748                           &ip_vs_genl_family, NLM_F_MULTI,
3749                           IPVS_CMD_NEW_DAEMON);
3750         if (!hdr)
3751                 return -EMSGSIZE;
3752
3753         if (ip_vs_genl_fill_daemon(skb, state, c))
3754                 goto nla_put_failure;
3755
3756         genlmsg_end(skb, hdr);
3757         return 0;
3758
3759 nla_put_failure:
3760         genlmsg_cancel(skb, hdr);
3761         return -EMSGSIZE;
3762 }
3763
3764 static int ip_vs_genl_dump_daemons(struct sk_buff *skb,
3765                                    struct netlink_callback *cb)
3766 {
3767         struct net *net = sock_net(skb->sk);
3768         struct netns_ipvs *ipvs = net_ipvs(net);
3769
3770         mutex_lock(&ipvs->sync_mutex);
3771         if ((ipvs->sync_state & IP_VS_STATE_MASTER) && !cb->args[0]) {
3772                 if (ip_vs_genl_dump_daemon(skb, IP_VS_STATE_MASTER,
3773                                            &ipvs->mcfg, cb) < 0)
3774                         goto nla_put_failure;
3775
3776                 cb->args[0] = 1;
3777         }
3778
3779         if ((ipvs->sync_state & IP_VS_STATE_BACKUP) && !cb->args[1]) {
3780                 if (ip_vs_genl_dump_daemon(skb, IP_VS_STATE_BACKUP,
3781                                            &ipvs->bcfg, cb) < 0)
3782                         goto nla_put_failure;
3783
3784                 cb->args[1] = 1;
3785         }
3786
3787 nla_put_failure:
3788         mutex_unlock(&ipvs->sync_mutex);
3789
3790         return skb->len;
3791 }
3792
3793 static int ip_vs_genl_new_daemon(struct netns_ipvs *ipvs, struct nlattr **attrs)
3794 {
3795         struct ipvs_sync_daemon_cfg c;
3796         struct nlattr *a;
3797         int ret;
3798
3799         memset(&c, 0, sizeof(c));
3800         if (!(attrs[IPVS_DAEMON_ATTR_STATE] &&
3801               attrs[IPVS_DAEMON_ATTR_MCAST_IFN] &&
3802               attrs[IPVS_DAEMON_ATTR_SYNC_ID]))
3803                 return -EINVAL;
3804         strscpy(c.mcast_ifn, nla_data(attrs[IPVS_DAEMON_ATTR_MCAST_IFN]),
3805                 sizeof(c.mcast_ifn));
3806         c.syncid = nla_get_u32(attrs[IPVS_DAEMON_ATTR_SYNC_ID]);
3807
3808         a = attrs[IPVS_DAEMON_ATTR_SYNC_MAXLEN];
3809         if (a)
3810                 c.sync_maxlen = nla_get_u16(a);
3811
3812         a = attrs[IPVS_DAEMON_ATTR_MCAST_GROUP];
3813         if (a) {
3814                 c.mcast_af = AF_INET;
3815                 c.mcast_group.ip = nla_get_in_addr(a);
3816                 if (!ipv4_is_multicast(c.mcast_group.ip))
3817                         return -EINVAL;
3818         } else {
3819                 a = attrs[IPVS_DAEMON_ATTR_MCAST_GROUP6];
3820                 if (a) {
3821 #ifdef CONFIG_IP_VS_IPV6
3822                         int addr_type;
3823
3824                         c.mcast_af = AF_INET6;
3825                         c.mcast_group.in6 = nla_get_in6_addr(a);
3826                         addr_type = ipv6_addr_type(&c.mcast_group.in6);
3827                         if (!(addr_type & IPV6_ADDR_MULTICAST))
3828                                 return -EINVAL;
3829 #else
3830                         return -EAFNOSUPPORT;
3831 #endif
3832                 }
3833         }
3834
3835         a = attrs[IPVS_DAEMON_ATTR_MCAST_PORT];
3836         if (a)
3837                 c.mcast_port = nla_get_u16(a);
3838
3839         a = attrs[IPVS_DAEMON_ATTR_MCAST_TTL];
3840         if (a)
3841                 c.mcast_ttl = nla_get_u8(a);
3842
3843         /* The synchronization protocol is incompatible with mixed family
3844          * services
3845          */
3846         if (ipvs->mixed_address_family_dests > 0)
3847                 return -EINVAL;
3848
3849         ret = start_sync_thread(ipvs, &c,
3850                                 nla_get_u32(attrs[IPVS_DAEMON_ATTR_STATE]));
3851         return ret;
3852 }
3853
3854 static int ip_vs_genl_del_daemon(struct netns_ipvs *ipvs, struct nlattr **attrs)
3855 {
3856         int ret;
3857
3858         if (!attrs[IPVS_DAEMON_ATTR_STATE])
3859                 return -EINVAL;
3860
3861         ret = stop_sync_thread(ipvs,
3862                                nla_get_u32(attrs[IPVS_DAEMON_ATTR_STATE]));
3863         return ret;
3864 }
3865
3866 static int ip_vs_genl_set_config(struct netns_ipvs *ipvs, struct nlattr **attrs)
3867 {
3868         struct ip_vs_timeout_user t;
3869
3870         __ip_vs_get_timeouts(ipvs, &t);
3871
3872         if (attrs[IPVS_CMD_ATTR_TIMEOUT_TCP])
3873                 t.tcp_timeout = nla_get_u32(attrs[IPVS_CMD_ATTR_TIMEOUT_TCP]);
3874
3875         if (attrs[IPVS_CMD_ATTR_TIMEOUT_TCP_FIN])
3876                 t.tcp_fin_timeout =
3877                         nla_get_u32(attrs[IPVS_CMD_ATTR_TIMEOUT_TCP_FIN]);
3878
3879         if (attrs[IPVS_CMD_ATTR_TIMEOUT_UDP])
3880                 t.udp_timeout = nla_get_u32(attrs[IPVS_CMD_ATTR_TIMEOUT_UDP]);
3881
3882         return ip_vs_set_timeout(ipvs, &t);
3883 }
3884
3885 static int ip_vs_genl_set_daemon(struct sk_buff *skb, struct genl_info *info)
3886 {
3887         int ret = -EINVAL, cmd;
3888         struct net *net = sock_net(skb->sk);
3889         struct netns_ipvs *ipvs = net_ipvs(net);
3890
3891         cmd = info->genlhdr->cmd;
3892
3893         if (cmd == IPVS_CMD_NEW_DAEMON || cmd == IPVS_CMD_DEL_DAEMON) {
3894                 struct nlattr *daemon_attrs[IPVS_DAEMON_ATTR_MAX + 1];
3895
3896                 if (!info->attrs[IPVS_CMD_ATTR_DAEMON] ||
3897                     nla_parse_nested_deprecated(daemon_attrs, IPVS_DAEMON_ATTR_MAX, info->attrs[IPVS_CMD_ATTR_DAEMON], ip_vs_daemon_policy, info->extack))
3898                         goto out;
3899
3900                 if (cmd == IPVS_CMD_NEW_DAEMON)
3901                         ret = ip_vs_genl_new_daemon(ipvs, daemon_attrs);
3902                 else
3903                         ret = ip_vs_genl_del_daemon(ipvs, daemon_attrs);
3904         }
3905
3906 out:
3907         return ret;
3908 }
3909
3910 static int ip_vs_genl_set_cmd(struct sk_buff *skb, struct genl_info *info)
3911 {
3912         bool need_full_svc = false, need_full_dest = false;
3913         struct ip_vs_service *svc = NULL;
3914         struct ip_vs_service_user_kern usvc;
3915         struct ip_vs_dest_user_kern udest;
3916         int ret = 0, cmd;
3917         struct net *net = sock_net(skb->sk);
3918         struct netns_ipvs *ipvs = net_ipvs(net);
3919
3920         cmd = info->genlhdr->cmd;
3921
3922         mutex_lock(&__ip_vs_mutex);
3923
3924         if (cmd == IPVS_CMD_FLUSH) {
3925                 ret = ip_vs_flush(ipvs, false);
3926                 goto out;
3927         } else if (cmd == IPVS_CMD_SET_CONFIG) {
3928                 ret = ip_vs_genl_set_config(ipvs, info->attrs);
3929                 goto out;
3930         } else if (cmd == IPVS_CMD_ZERO &&
3931                    !info->attrs[IPVS_CMD_ATTR_SERVICE]) {
3932                 ret = ip_vs_zero_all(ipvs);
3933                 goto out;
3934         }
3935
3936         /* All following commands require a service argument, so check if we
3937          * received a valid one. We need a full service specification when
3938          * adding / editing a service. Only identifying members otherwise. */
3939         if (cmd == IPVS_CMD_NEW_SERVICE || cmd == IPVS_CMD_SET_SERVICE)
3940                 need_full_svc = true;
3941
3942         ret = ip_vs_genl_parse_service(ipvs, &usvc,
3943                                        info->attrs[IPVS_CMD_ATTR_SERVICE],
3944                                        need_full_svc, &svc);
3945         if (ret)
3946                 goto out;
3947
3948         /* Unless we're adding a new service, the service must already exist */
3949         if ((cmd != IPVS_CMD_NEW_SERVICE) && (svc == NULL)) {
3950                 ret = -ESRCH;
3951                 goto out;
3952         }
3953
3954         /* Destination commands require a valid destination argument. For
3955          * adding / editing a destination, we need a full destination
3956          * specification. */
3957         if (cmd == IPVS_CMD_NEW_DEST || cmd == IPVS_CMD_SET_DEST ||
3958             cmd == IPVS_CMD_DEL_DEST) {
3959                 if (cmd != IPVS_CMD_DEL_DEST)
3960                         need_full_dest = true;
3961
3962                 ret = ip_vs_genl_parse_dest(&udest,
3963                                             info->attrs[IPVS_CMD_ATTR_DEST],
3964                                             need_full_dest);
3965                 if (ret)
3966                         goto out;
3967
3968                 /* Old protocols did not allow the user to specify address
3969                  * family, so we set it to zero instead.  We also didn't
3970                  * allow heterogeneous pools in the old code, so it's safe
3971                  * to assume that this will have the same address family as
3972                  * the service.
3973                  */
3974                 if (udest.af == 0)
3975                         udest.af = svc->af;
3976
3977                 if (!ip_vs_is_af_valid(udest.af)) {
3978                         ret = -EAFNOSUPPORT;
3979                         goto out;
3980                 }
3981
3982                 if (udest.af != svc->af && cmd != IPVS_CMD_DEL_DEST) {
3983                         /* The synchronization protocol is incompatible
3984                          * with mixed family services
3985                          */
3986                         if (ipvs->sync_state) {
3987                                 ret = -EINVAL;
3988                                 goto out;
3989                         }
3990
3991                         /* Which connection types do we support? */
3992                         switch (udest.conn_flags) {
3993                         case IP_VS_CONN_F_TUNNEL:
3994                                 /* We are able to forward this */
3995                                 break;
3996                         default:
3997                                 ret = -EINVAL;
3998                                 goto out;
3999                         }
4000                 }
4001         }
4002
4003         switch (cmd) {
4004         case IPVS_CMD_NEW_SERVICE:
4005                 if (svc == NULL)
4006                         ret = ip_vs_add_service(ipvs, &usvc, &svc);
4007                 else
4008                         ret = -EEXIST;
4009                 break;
4010         case IPVS_CMD_SET_SERVICE:
4011                 ret = ip_vs_edit_service(svc, &usvc);
4012                 break;
4013         case IPVS_CMD_DEL_SERVICE:
4014                 ret = ip_vs_del_service(svc);
4015                 /* do not use svc, it can be freed */
4016                 break;
4017         case IPVS_CMD_NEW_DEST:
4018                 ret = ip_vs_add_dest(svc, &udest);
4019                 break;
4020         case IPVS_CMD_SET_DEST:
4021                 ret = ip_vs_edit_dest(svc, &udest);
4022                 break;
4023         case IPVS_CMD_DEL_DEST:
4024                 ret = ip_vs_del_dest(svc, &udest);
4025                 break;
4026         case IPVS_CMD_ZERO:
4027                 ret = ip_vs_zero_service(svc);
4028                 break;
4029         default:
4030                 ret = -EINVAL;
4031         }
4032
4033 out:
4034         mutex_unlock(&__ip_vs_mutex);
4035
4036         return ret;
4037 }
4038
4039 static int ip_vs_genl_get_cmd(struct sk_buff *skb, struct genl_info *info)
4040 {
4041         struct sk_buff *msg;
4042         void *reply;
4043         int ret, cmd, reply_cmd;
4044         struct net *net = sock_net(skb->sk);
4045         struct netns_ipvs *ipvs = net_ipvs(net);
4046
4047         cmd = info->genlhdr->cmd;
4048
4049         if (cmd == IPVS_CMD_GET_SERVICE)
4050                 reply_cmd = IPVS_CMD_NEW_SERVICE;
4051         else if (cmd == IPVS_CMD_GET_INFO)
4052                 reply_cmd = IPVS_CMD_SET_INFO;
4053         else if (cmd == IPVS_CMD_GET_CONFIG)
4054                 reply_cmd = IPVS_CMD_SET_CONFIG;
4055         else {
4056                 pr_err("unknown Generic Netlink command\n");
4057                 return -EINVAL;
4058         }
4059
4060         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
4061         if (!msg)
4062                 return -ENOMEM;
4063
4064         mutex_lock(&__ip_vs_mutex);
4065
4066         reply = genlmsg_put_reply(msg, info, &ip_vs_genl_family, 0, reply_cmd);
4067         if (reply == NULL)
4068                 goto nla_put_failure;
4069
4070         switch (cmd) {
4071         case IPVS_CMD_GET_SERVICE:
4072         {
4073                 struct ip_vs_service *svc;
4074
4075                 svc = ip_vs_genl_find_service(ipvs,
4076                                               info->attrs[IPVS_CMD_ATTR_SERVICE]);
4077                 if (IS_ERR(svc)) {
4078                         ret = PTR_ERR(svc);
4079                         goto out_err;
4080                 } else if (svc) {
4081                         ret = ip_vs_genl_fill_service(msg, svc);
4082                         if (ret)
4083                                 goto nla_put_failure;
4084                 } else {
4085                         ret = -ESRCH;
4086                         goto out_err;
4087                 }
4088
4089                 break;
4090         }
4091
4092         case IPVS_CMD_GET_CONFIG:
4093         {
4094                 struct ip_vs_timeout_user t;
4095
4096                 __ip_vs_get_timeouts(ipvs, &t);
4097 #ifdef CONFIG_IP_VS_PROTO_TCP
4098                 if (nla_put_u32(msg, IPVS_CMD_ATTR_TIMEOUT_TCP,
4099                                 t.tcp_timeout) ||
4100                     nla_put_u32(msg, IPVS_CMD_ATTR_TIMEOUT_TCP_FIN,
4101                                 t.tcp_fin_timeout))
4102                         goto nla_put_failure;
4103 #endif
4104 #ifdef CONFIG_IP_VS_PROTO_UDP
4105                 if (nla_put_u32(msg, IPVS_CMD_ATTR_TIMEOUT_UDP, t.udp_timeout))
4106                         goto nla_put_failure;
4107 #endif
4108
4109                 break;
4110         }
4111
4112         case IPVS_CMD_GET_INFO:
4113                 if (nla_put_u32(msg, IPVS_INFO_ATTR_VERSION,
4114                                 IP_VS_VERSION_CODE) ||
4115                     nla_put_u32(msg, IPVS_INFO_ATTR_CONN_TAB_SIZE,
4116                                 ip_vs_conn_tab_size))
4117                         goto nla_put_failure;
4118                 break;
4119         }
4120
4121         genlmsg_end(msg, reply);
4122         ret = genlmsg_reply(msg, info);
4123         goto out;
4124
4125 nla_put_failure:
4126         pr_err("not enough space in Netlink message\n");
4127         ret = -EMSGSIZE;
4128
4129 out_err:
4130         nlmsg_free(msg);
4131 out:
4132         mutex_unlock(&__ip_vs_mutex);
4133
4134         return ret;
4135 }
4136
4137
4138 static const struct genl_small_ops ip_vs_genl_ops[] = {
4139         {
4140                 .cmd    = IPVS_CMD_NEW_SERVICE,
4141                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
4142                 .flags  = GENL_ADMIN_PERM,
4143                 .doit   = ip_vs_genl_set_cmd,
4144         },
4145         {
4146                 .cmd    = IPVS_CMD_SET_SERVICE,
4147                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
4148                 .flags  = GENL_ADMIN_PERM,
4149                 .doit   = ip_vs_genl_set_cmd,
4150         },
4151         {
4152                 .cmd    = IPVS_CMD_DEL_SERVICE,
4153                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
4154                 .flags  = GENL_ADMIN_PERM,
4155                 .doit   = ip_vs_genl_set_cmd,
4156         },
4157         {
4158                 .cmd    = IPVS_CMD_GET_SERVICE,
4159                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
4160                 .flags  = GENL_ADMIN_PERM,
4161                 .doit   = ip_vs_genl_get_cmd,
4162                 .dumpit = ip_vs_genl_dump_services,
4163         },
4164         {
4165                 .cmd    = IPVS_CMD_NEW_DEST,
4166                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
4167                 .flags  = GENL_ADMIN_PERM,
4168                 .doit   = ip_vs_genl_set_cmd,
4169         },
4170         {
4171                 .cmd    = IPVS_CMD_SET_DEST,
4172                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
4173                 .flags  = GENL_ADMIN_PERM,
4174                 .doit   = ip_vs_genl_set_cmd,
4175         },
4176         {
4177                 .cmd    = IPVS_CMD_DEL_DEST,
4178                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
4179                 .flags  = GENL_ADMIN_PERM,
4180                 .doit   = ip_vs_genl_set_cmd,
4181         },
4182         {
4183                 .cmd    = IPVS_CMD_GET_DEST,
4184                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
4185                 .flags  = GENL_ADMIN_PERM,
4186                 .dumpit = ip_vs_genl_dump_dests,
4187         },
4188         {
4189                 .cmd    = IPVS_CMD_NEW_DAEMON,
4190                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
4191                 .flags  = GENL_ADMIN_PERM,
4192                 .doit   = ip_vs_genl_set_daemon,
4193         },
4194         {
4195                 .cmd    = IPVS_CMD_DEL_DAEMON,
4196                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
4197                 .flags  = GENL_ADMIN_PERM,
4198                 .doit   = ip_vs_genl_set_daemon,
4199         },
4200         {
4201                 .cmd    = IPVS_CMD_GET_DAEMON,
4202                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
4203                 .flags  = GENL_ADMIN_PERM,
4204                 .dumpit = ip_vs_genl_dump_daemons,
4205         },
4206         {
4207                 .cmd    = IPVS_CMD_SET_CONFIG,
4208                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
4209                 .flags  = GENL_ADMIN_PERM,
4210                 .doit   = ip_vs_genl_set_cmd,
4211         },
4212         {
4213                 .cmd    = IPVS_CMD_GET_CONFIG,
4214                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
4215                 .flags  = GENL_ADMIN_PERM,
4216                 .doit   = ip_vs_genl_get_cmd,
4217         },
4218         {
4219                 .cmd    = IPVS_CMD_GET_INFO,
4220                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
4221                 .flags  = GENL_ADMIN_PERM,
4222                 .doit   = ip_vs_genl_get_cmd,
4223         },
4224         {
4225                 .cmd    = IPVS_CMD_ZERO,
4226                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
4227                 .flags  = GENL_ADMIN_PERM,
4228                 .doit   = ip_vs_genl_set_cmd,
4229         },
4230         {
4231                 .cmd    = IPVS_CMD_FLUSH,
4232                 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
4233                 .flags  = GENL_ADMIN_PERM,
4234                 .doit   = ip_vs_genl_set_cmd,
4235         },
4236 };
4237
4238 static struct genl_family ip_vs_genl_family __ro_after_init = {
4239         .hdrsize        = 0,
4240         .name           = IPVS_GENL_NAME,
4241         .version        = IPVS_GENL_VERSION,
4242         .maxattr        = IPVS_CMD_ATTR_MAX,
4243         .policy = ip_vs_cmd_policy,
4244         .netnsok        = true,         /* Make ipvsadm to work on netns */
4245         .module         = THIS_MODULE,
4246         .small_ops      = ip_vs_genl_ops,
4247         .n_small_ops    = ARRAY_SIZE(ip_vs_genl_ops),
4248         .resv_start_op  = IPVS_CMD_FLUSH + 1,
4249 };
4250
4251 static int __init ip_vs_genl_register(void)
4252 {
4253         return genl_register_family(&ip_vs_genl_family);
4254 }
4255
4256 static void ip_vs_genl_unregister(void)
4257 {
4258         genl_unregister_family(&ip_vs_genl_family);
4259 }
4260
4261 /* End of Generic Netlink interface definitions */
4262
4263 /*
4264  * per netns intit/exit func.
4265  */
4266 #ifdef CONFIG_SYSCTL
4267 static int __net_init ip_vs_control_net_init_sysctl(struct netns_ipvs *ipvs)
4268 {
4269         struct net *net = ipvs->net;
4270         struct ctl_table *tbl;
4271         int idx, ret;
4272         size_t ctl_table_size = ARRAY_SIZE(vs_vars);
4273
4274         atomic_set(&ipvs->dropentry, 0);
4275         spin_lock_init(&ipvs->dropentry_lock);
4276         spin_lock_init(&ipvs->droppacket_lock);
4277         spin_lock_init(&ipvs->securetcp_lock);
4278         INIT_DELAYED_WORK(&ipvs->defense_work, defense_work_handler);
4279         INIT_DELAYED_WORK(&ipvs->expire_nodest_conn_work,
4280                           expire_nodest_conn_handler);
4281         ipvs->est_stopped = 0;
4282
4283         if (!net_eq(net, &init_net)) {
4284                 tbl = kmemdup(vs_vars, sizeof(vs_vars), GFP_KERNEL);
4285                 if (tbl == NULL)
4286                         return -ENOMEM;
4287
4288                 /* Don't export sysctls to unprivileged users */
4289                 if (net->user_ns != &init_user_ns) {
4290                         tbl[0].procname = NULL;
4291                         ctl_table_size = 0;
4292                 }
4293         } else
4294                 tbl = vs_vars;
4295         /* Initialize sysctl defaults */
4296         for (idx = 0; idx < ARRAY_SIZE(vs_vars); idx++) {
4297                 if (tbl[idx].proc_handler == proc_do_defense_mode)
4298                         tbl[idx].extra2 = ipvs;
4299         }
4300         idx = 0;
4301         ipvs->sysctl_amemthresh = 1024;
4302         tbl[idx++].data = &ipvs->sysctl_amemthresh;
4303         ipvs->sysctl_am_droprate = 10;
4304         tbl[idx++].data = &ipvs->sysctl_am_droprate;
4305         tbl[idx++].data = &ipvs->sysctl_drop_entry;
4306         tbl[idx++].data = &ipvs->sysctl_drop_packet;
4307 #ifdef CONFIG_IP_VS_NFCT
4308         tbl[idx++].data = &ipvs->sysctl_conntrack;
4309 #endif
4310         tbl[idx++].data = &ipvs->sysctl_secure_tcp;
4311         ipvs->sysctl_snat_reroute = 1;
4312         tbl[idx++].data = &ipvs->sysctl_snat_reroute;
4313         ipvs->sysctl_sync_ver = 1;
4314         tbl[idx++].data = &ipvs->sysctl_sync_ver;
4315         ipvs->sysctl_sync_ports = 1;
4316         tbl[idx++].data = &ipvs->sysctl_sync_ports;
4317         tbl[idx++].data = &ipvs->sysctl_sync_persist_mode;
4318         ipvs->sysctl_sync_qlen_max = nr_free_buffer_pages() / 32;
4319         tbl[idx++].data = &ipvs->sysctl_sync_qlen_max;
4320         ipvs->sysctl_sync_sock_size = 0;
4321         tbl[idx++].data = &ipvs->sysctl_sync_sock_size;
4322         tbl[idx++].data = &ipvs->sysctl_cache_bypass;
4323         tbl[idx++].data = &ipvs->sysctl_expire_nodest_conn;
4324         tbl[idx++].data = &ipvs->sysctl_sloppy_tcp;
4325         tbl[idx++].data = &ipvs->sysctl_sloppy_sctp;
4326         tbl[idx++].data = &ipvs->sysctl_expire_quiescent_template;
4327         ipvs->sysctl_sync_threshold[0] = DEFAULT_SYNC_THRESHOLD;
4328         ipvs->sysctl_sync_threshold[1] = DEFAULT_SYNC_PERIOD;
4329         tbl[idx].data = &ipvs->sysctl_sync_threshold;
4330         tbl[idx].extra2 = ipvs;
4331         tbl[idx++].maxlen = sizeof(ipvs->sysctl_sync_threshold);
4332         ipvs->sysctl_sync_refresh_period = DEFAULT_SYNC_REFRESH_PERIOD;
4333         tbl[idx++].data = &ipvs->sysctl_sync_refresh_period;
4334         ipvs->sysctl_sync_retries = clamp_t(int, DEFAULT_SYNC_RETRIES, 0, 3);
4335         tbl[idx++].data = &ipvs->sysctl_sync_retries;
4336         tbl[idx++].data = &ipvs->sysctl_nat_icmp_send;
4337         ipvs->sysctl_pmtu_disc = 1;
4338         tbl[idx++].data = &ipvs->sysctl_pmtu_disc;
4339         tbl[idx++].data = &ipvs->sysctl_backup_only;
4340         ipvs->sysctl_conn_reuse_mode = 1;
4341         tbl[idx++].data = &ipvs->sysctl_conn_reuse_mode;
4342         tbl[idx++].data = &ipvs->sysctl_schedule_icmp;
4343         tbl[idx++].data = &ipvs->sysctl_ignore_tunneled;
4344         ipvs->sysctl_run_estimation = 1;
4345         tbl[idx].extra2 = ipvs;
4346         tbl[idx++].data = &ipvs->sysctl_run_estimation;
4347
4348         ipvs->est_cpulist_valid = 0;
4349         tbl[idx].extra2 = ipvs;
4350         tbl[idx++].data = &ipvs->sysctl_est_cpulist;
4351
4352         ipvs->sysctl_est_nice = IPVS_EST_NICE;
4353         tbl[idx].extra2 = ipvs;
4354         tbl[idx++].data = &ipvs->sysctl_est_nice;
4355
4356 #ifdef CONFIG_IP_VS_DEBUG
4357         /* Global sysctls must be ro in non-init netns */
4358         if (!net_eq(net, &init_net))
4359                 tbl[idx++].mode = 0444;
4360 #endif
4361
4362         ret = -ENOMEM;
4363         ipvs->sysctl_hdr = register_net_sysctl_sz(net, "net/ipv4/vs", tbl,
4364                                                   ctl_table_size);
4365         if (!ipvs->sysctl_hdr)
4366                 goto err;
4367         ipvs->sysctl_tbl = tbl;
4368
4369         ret = ip_vs_start_estimator(ipvs, &ipvs->tot_stats->s);
4370         if (ret < 0)
4371                 goto err;
4372
4373         /* Schedule defense work */
4374         queue_delayed_work(system_long_wq, &ipvs->defense_work,
4375                            DEFENSE_TIMER_PERIOD);
4376
4377         return 0;
4378
4379 err:
4380         unregister_net_sysctl_table(ipvs->sysctl_hdr);
4381         if (!net_eq(net, &init_net))
4382                 kfree(tbl);
4383         return ret;
4384 }
4385
4386 static void __net_exit ip_vs_control_net_cleanup_sysctl(struct netns_ipvs *ipvs)
4387 {
4388         struct net *net = ipvs->net;
4389
4390         cancel_delayed_work_sync(&ipvs->expire_nodest_conn_work);
4391         cancel_delayed_work_sync(&ipvs->defense_work);
4392         cancel_work_sync(&ipvs->defense_work.work);
4393         unregister_net_sysctl_table(ipvs->sysctl_hdr);
4394         ip_vs_stop_estimator(ipvs, &ipvs->tot_stats->s);
4395
4396         if (ipvs->est_cpulist_valid)
4397                 free_cpumask_var(ipvs->sysctl_est_cpulist);
4398
4399         if (!net_eq(net, &init_net))
4400                 kfree(ipvs->sysctl_tbl);
4401 }
4402
4403 #else
4404
4405 static int __net_init ip_vs_control_net_init_sysctl(struct netns_ipvs *ipvs) { return 0; }
4406 static void __net_exit ip_vs_control_net_cleanup_sysctl(struct netns_ipvs *ipvs) { }
4407
4408 #endif
4409
4410 static struct notifier_block ip_vs_dst_notifier = {
4411         .notifier_call = ip_vs_dst_event,
4412 #ifdef CONFIG_IP_VS_IPV6
4413         .priority = ADDRCONF_NOTIFY_PRIORITY + 5,
4414 #endif
4415 };
4416
4417 int __net_init ip_vs_control_net_init(struct netns_ipvs *ipvs)
4418 {
4419         int ret = -ENOMEM;
4420         int idx;
4421
4422         /* Initialize rs_table */
4423         for (idx = 0; idx < IP_VS_RTAB_SIZE; idx++)
4424                 INIT_HLIST_HEAD(&ipvs->rs_table[idx]);
4425
4426         INIT_LIST_HEAD(&ipvs->dest_trash);
4427         spin_lock_init(&ipvs->dest_trash_lock);
4428         timer_setup(&ipvs->dest_trash_timer, ip_vs_dest_trash_expire, 0);
4429         atomic_set(&ipvs->ftpsvc_counter, 0);
4430         atomic_set(&ipvs->nullsvc_counter, 0);
4431         atomic_set(&ipvs->conn_out_counter, 0);
4432
4433         INIT_DELAYED_WORK(&ipvs->est_reload_work, est_reload_work_handler);
4434
4435         /* procfs stats */
4436         ipvs->tot_stats = kzalloc(sizeof(*ipvs->tot_stats), GFP_KERNEL);
4437         if (!ipvs->tot_stats)
4438                 goto out;
4439         if (ip_vs_stats_init_alloc(&ipvs->tot_stats->s) < 0)
4440                 goto err_tot_stats;
4441
4442 #ifdef CONFIG_PROC_FS
4443         if (!proc_create_net("ip_vs", 0, ipvs->net->proc_net,
4444                              &ip_vs_info_seq_ops, sizeof(struct ip_vs_iter)))
4445                 goto err_vs;
4446         if (!proc_create_net_single("ip_vs_stats", 0, ipvs->net->proc_net,
4447                                     ip_vs_stats_show, NULL))
4448                 goto err_stats;
4449         if (!proc_create_net_single("ip_vs_stats_percpu", 0,
4450                                     ipvs->net->proc_net,
4451                                     ip_vs_stats_percpu_show, NULL))
4452                 goto err_percpu;
4453 #endif
4454
4455         ret = ip_vs_control_net_init_sysctl(ipvs);
4456         if (ret < 0)
4457                 goto err;
4458
4459         return 0;
4460
4461 err:
4462 #ifdef CONFIG_PROC_FS
4463         remove_proc_entry("ip_vs_stats_percpu", ipvs->net->proc_net);
4464
4465 err_percpu:
4466         remove_proc_entry("ip_vs_stats", ipvs->net->proc_net);
4467
4468 err_stats:
4469         remove_proc_entry("ip_vs", ipvs->net->proc_net);
4470
4471 err_vs:
4472 #endif
4473         ip_vs_stats_release(&ipvs->tot_stats->s);
4474
4475 err_tot_stats:
4476         kfree(ipvs->tot_stats);
4477
4478 out:
4479         return ret;
4480 }
4481
4482 void __net_exit ip_vs_control_net_cleanup(struct netns_ipvs *ipvs)
4483 {
4484         ip_vs_trash_cleanup(ipvs);
4485         ip_vs_control_net_cleanup_sysctl(ipvs);
4486         cancel_delayed_work_sync(&ipvs->est_reload_work);
4487 #ifdef CONFIG_PROC_FS
4488         remove_proc_entry("ip_vs_stats_percpu", ipvs->net->proc_net);
4489         remove_proc_entry("ip_vs_stats", ipvs->net->proc_net);
4490         remove_proc_entry("ip_vs", ipvs->net->proc_net);
4491 #endif
4492         call_rcu(&ipvs->tot_stats->rcu_head, ip_vs_stats_rcu_free);
4493 }
4494
4495 int __init ip_vs_register_nl_ioctl(void)
4496 {
4497         int ret;
4498
4499         ret = nf_register_sockopt(&ip_vs_sockopts);
4500         if (ret) {
4501                 pr_err("cannot register sockopt.\n");
4502                 goto err_sock;
4503         }
4504
4505         ret = ip_vs_genl_register();
4506         if (ret) {
4507                 pr_err("cannot register Generic Netlink interface.\n");
4508                 goto err_genl;
4509         }
4510         return 0;
4511
4512 err_genl:
4513         nf_unregister_sockopt(&ip_vs_sockopts);
4514 err_sock:
4515         return ret;
4516 }
4517
4518 void ip_vs_unregister_nl_ioctl(void)
4519 {
4520         ip_vs_genl_unregister();
4521         nf_unregister_sockopt(&ip_vs_sockopts);
4522 }
4523
4524 int __init ip_vs_control_init(void)
4525 {
4526         int idx;
4527         int ret;
4528
4529         /* Initialize svc_table, ip_vs_svc_fwm_table */
4530         for (idx = 0; idx < IP_VS_SVC_TAB_SIZE; idx++) {
4531                 INIT_HLIST_HEAD(&ip_vs_svc_table[idx]);
4532                 INIT_HLIST_HEAD(&ip_vs_svc_fwm_table[idx]);
4533         }
4534
4535         smp_wmb();      /* Do we really need it now ? */
4536
4537         ret = register_netdevice_notifier(&ip_vs_dst_notifier);
4538         if (ret < 0)
4539                 return ret;
4540
4541         return 0;
4542 }
4543
4544
4545 void ip_vs_control_cleanup(void)
4546 {
4547         unregister_netdevice_notifier(&ip_vs_dst_notifier);
4548         /* relying on common rcu_barrier() in ip_vs_cleanup() */
4549 }