net/netfilter/ipvs/ip_vs_core.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  * The IPVS code for kernel 2.2 was done by Wensong Zhang and Peter Kese,
  14  * with changes/fixes from Julian Anastasov, Lars Marowsky-Bree, Horms
  15  * and others.
  16  *
  17  * Changes:
  18  *      Paul `Rusty' Russell            properly handle non-linear skbs
  19  *      Harald Welte                    don't use nfcache
  20  */
  21
  22 #define KMSG_COMPONENT "IPVS"
  23 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  24
  25 #include <linux/module.h>
  26 #include <linux/kernel.h>
  27 #include <linux/ip.h>
  28 #include <linux/tcp.h>
  29 #include <linux/sctp.h>
  30 #include <linux/icmp.h>
  31 #include <linux/slab.h>
  32
  33 #include <net/ip.h>
  34 #include <net/tcp.h>
  35 #include <net/udp.h>
  36 #include <net/icmp.h>                   /* for icmp_send */
  37 #include <net/gue.h>
  38 #include <net/gre.h>
  39 #include <net/route.h>
  40 #include <net/ip6_checksum.h>
  41 #include <net/netns/generic.h>          /* net_generic() */
  42
  43 #include <linux/netfilter.h>
  44 #include <linux/netfilter_ipv4.h>
  45
  46 #ifdef CONFIG_IP_VS_IPV6
  47 #include <net/ipv6.h>
  48 #include <linux/netfilter_ipv6.h>
  49 #include <net/ip6_route.h>
  50 #endif
  51
  52 #include <net/ip_vs.h>
  53 #include <linux/indirect_call_wrapper.h>
  54
  55
  56 EXPORT_SYMBOL(register_ip_vs_scheduler);
  57 EXPORT_SYMBOL(unregister_ip_vs_scheduler);
  58 EXPORT_SYMBOL(ip_vs_proto_name);
  59 EXPORT_SYMBOL(ip_vs_conn_new);
  60 EXPORT_SYMBOL(ip_vs_conn_in_get);
  61 EXPORT_SYMBOL(ip_vs_conn_out_get);
  62 #ifdef CONFIG_IP_VS_PROTO_TCP
  63 EXPORT_SYMBOL(ip_vs_tcp_conn_listen);
  64 #endif
  65 EXPORT_SYMBOL(ip_vs_conn_put);
  66 #ifdef CONFIG_IP_VS_DEBUG
  67 EXPORT_SYMBOL(ip_vs_get_debug_level);
  68 #endif
  69 EXPORT_SYMBOL(ip_vs_new_conn_out);
  70
  71 #if defined(CONFIG_IP_VS_PROTO_TCP) && defined(CONFIG_IP_VS_PROTO_UDP)
  72 #define SNAT_CALL(f, ...) \
  73         INDIRECT_CALL_2(f, tcp_snat_handler, udp_snat_handler, __VA_ARGS__)
  74 #elif defined(CONFIG_IP_VS_PROTO_TCP)
  75 #define SNAT_CALL(f, ...) INDIRECT_CALL_1(f, tcp_snat_handler, __VA_ARGS__)
  76 #elif defined(CONFIG_IP_VS_PROTO_UDP)
  77 #define SNAT_CALL(f, ...) INDIRECT_CALL_1(f, udp_snat_handler, __VA_ARGS__)
  78 #else
  79 #define SNAT_CALL(f, ...) f(__VA_ARGS__)
  80 #endif
  81
  82 static unsigned int ip_vs_net_id __read_mostly;
  83 /* netns cnt used for uniqueness */
  84 static atomic_t ipvs_netns_cnt = ATOMIC_INIT(0);
  85
  86 /* ID used in ICMP lookups */
  87 #define icmp_id(icmph)          (((icmph)->un).echo.id)
  88 #define icmpv6_id(icmph)        (icmph->icmp6_dataun.u_echo.identifier)
  89
  90 const char *ip_vs_proto_name(unsigned int proto)
  91 {
  92         static char buf[20];
  93
  94         switch (proto) {
  95         case IPPROTO_IP:
  96                 return "IP";
  97         case IPPROTO_UDP:
  98                 return "UDP";
  99         case IPPROTO_TCP:
 100                 return "TCP";
 101         case IPPROTO_SCTP:
 102                 return "SCTP";
 103         case IPPROTO_ICMP:
 104                 return "ICMP";
 105 #ifdef CONFIG_IP_VS_IPV6
 106         case IPPROTO_ICMPV6:
 107                 return "ICMPv6";
 108 #endif
 109         default:
 110                 sprintf(buf, "IP_%u", proto);
 111                 return buf;
 112         }
 113 }
 114
 115 void ip_vs_init_hash_table(struct list_head *table, int rows)
 116 {
 117         while (--rows >= 0)
 118                 INIT_LIST_HEAD(&table[rows]);
 119 }
 120
 121 static inline void
 122 ip_vs_in_stats(struct ip_vs_conn *cp, struct sk_buff *skb)
 123 {
 124         struct ip_vs_dest *dest = cp->dest;
 125         struct netns_ipvs *ipvs = cp->ipvs;
 126
 127         if (dest && (dest->flags & IP_VS_DEST_F_AVAILABLE)) {
 128                 struct ip_vs_cpu_stats *s;
 129                 struct ip_vs_service *svc;
 130
 131                 local_bh_disable();
 132
 133                 s = this_cpu_ptr(dest->stats.cpustats);
 134                 u64_stats_update_begin(&s->syncp);
 135                 u64_stats_inc(&s->cnt.inpkts);
 136                 u64_stats_add(&s->cnt.inbytes, skb->len);
 137                 u64_stats_update_end(&s->syncp);
 138
 139                 svc = rcu_dereference(dest->svc);
 140                 s = this_cpu_ptr(svc->stats.cpustats);
 141                 u64_stats_update_begin(&s->syncp);
 142                 u64_stats_inc(&s->cnt.inpkts);
 143                 u64_stats_add(&s->cnt.inbytes, skb->len);
 144                 u64_stats_update_end(&s->syncp);
 145
 146                 s = this_cpu_ptr(ipvs->tot_stats->s.cpustats);
 147                 u64_stats_update_begin(&s->syncp);
 148                 u64_stats_inc(&s->cnt.inpkts);
 149                 u64_stats_add(&s->cnt.inbytes, skb->len);
 150                 u64_stats_update_end(&s->syncp);
 151
 152                 local_bh_enable();
 153         }
 154 }
 155
 156
 157 static inline void
 158 ip_vs_out_stats(struct ip_vs_conn *cp, struct sk_buff *skb)
 159 {
 160         struct ip_vs_dest *dest = cp->dest;
 161         struct netns_ipvs *ipvs = cp->ipvs;
 162
 163         if (dest && (dest->flags & IP_VS_DEST_F_AVAILABLE)) {
 164                 struct ip_vs_cpu_stats *s;
 165                 struct ip_vs_service *svc;
 166
 167                 local_bh_disable();
 168
 169                 s = this_cpu_ptr(dest->stats.cpustats);
 170                 u64_stats_update_begin(&s->syncp);
 171                 u64_stats_inc(&s->cnt.outpkts);
 172                 u64_stats_add(&s->cnt.outbytes, skb->len);
 173                 u64_stats_update_end(&s->syncp);
 174
 175                 svc = rcu_dereference(dest->svc);
 176                 s = this_cpu_ptr(svc->stats.cpustats);
 177                 u64_stats_update_begin(&s->syncp);
 178                 u64_stats_inc(&s->cnt.outpkts);
 179                 u64_stats_add(&s->cnt.outbytes, skb->len);
 180                 u64_stats_update_end(&s->syncp);
 181
 182                 s = this_cpu_ptr(ipvs->tot_stats->s.cpustats);
 183                 u64_stats_update_begin(&s->syncp);
 184                 u64_stats_inc(&s->cnt.outpkts);
 185                 u64_stats_add(&s->cnt.outbytes, skb->len);
 186                 u64_stats_update_end(&s->syncp);
 187
 188                 local_bh_enable();
 189         }
 190 }
 191
 192
 193 static inline void
 194 ip_vs_conn_stats(struct ip_vs_conn *cp, struct ip_vs_service *svc)
 195 {
 196         struct netns_ipvs *ipvs = svc->ipvs;
 197         struct ip_vs_cpu_stats *s;
 198
 199         local_bh_disable();
 200
 201         s = this_cpu_ptr(cp->dest->stats.cpustats);
 202         u64_stats_update_begin(&s->syncp);
 203         u64_stats_inc(&s->cnt.conns);
 204         u64_stats_update_end(&s->syncp);
 205
 206         s = this_cpu_ptr(svc->stats.cpustats);
 207         u64_stats_update_begin(&s->syncp);
 208         u64_stats_inc(&s->cnt.conns);
 209         u64_stats_update_end(&s->syncp);
 210
 211         s = this_cpu_ptr(ipvs->tot_stats->s.cpustats);
 212         u64_stats_update_begin(&s->syncp);
 213         u64_stats_inc(&s->cnt.conns);
 214         u64_stats_update_end(&s->syncp);
 215
 216         local_bh_enable();
 217 }
 218
 219
 220 static inline void
 221 ip_vs_set_state(struct ip_vs_conn *cp, int direction,
 222                 const struct sk_buff *skb,
 223                 struct ip_vs_proto_data *pd)
 224 {
 225         if (likely(pd->pp->state_transition))
 226                 pd->pp->state_transition(cp, direction, skb, pd);
 227 }
 228
 229 static inline int
 230 ip_vs_conn_fill_param_persist(const struct ip_vs_service *svc,
 231                               struct sk_buff *skb, int protocol,
 232                               const union nf_inet_addr *caddr, __be16 cport,
 233                               const union nf_inet_addr *vaddr, __be16 vport,
 234                               struct ip_vs_conn_param *p)
 235 {
 236         ip_vs_conn_fill_param(svc->ipvs, svc->af, protocol, caddr, cport, vaddr,
 237                               vport, p);
 238         p->pe = rcu_dereference(svc->pe);
 239         if (p->pe && p->pe->fill_param)
 240                 return p->pe->fill_param(p, skb);
 241
 242         return 0;
 243 }
 244
 245 /*
 246  *  IPVS persistent scheduling function
 247  *  It creates a connection entry according to its template if exists,
 248  *  or selects a server and creates a connection entry plus a template.
 249  *  Locking: we are svc user (svc->refcnt), so we hold all dests too
 250  *  Protocols supported: TCP, UDP
 251  */
 252 static struct ip_vs_conn *
 253 ip_vs_sched_persist(struct ip_vs_service *svc,
 254                     struct sk_buff *skb, __be16 src_port, __be16 dst_port,
 255                     int *ignored, struct ip_vs_iphdr *iph)
 256 {
 257         struct ip_vs_conn *cp = NULL;
 258         struct ip_vs_dest *dest;
 259         struct ip_vs_conn *ct;
 260         __be16 dport = 0;               /* destination port to forward */
 261         unsigned int flags;
 262         struct ip_vs_conn_param param;
 263         const union nf_inet_addr fwmark = { .ip = htonl(svc->fwmark) };
 264         union nf_inet_addr snet;        /* source network of the client,
 265                                            after masking */
 266         const union nf_inet_addr *src_addr, *dst_addr;
 267
 268         if (likely(!ip_vs_iph_inverse(iph))) {
 269                 src_addr = &iph->saddr;
 270                 dst_addr = &iph->daddr;
 271         } else {
 272                 src_addr = &iph->daddr;
 273                 dst_addr = &iph->saddr;
 274         }
 275
 276
 277         /* Mask saddr with the netmask to adjust template granularity */
 278 #ifdef CONFIG_IP_VS_IPV6
 279         if (svc->af == AF_INET6)
 280                 ipv6_addr_prefix(&snet.in6, &src_addr->in6,
 281                                  (__force __u32) svc->netmask);
 282         else
 283 #endif
 284                 snet.ip = src_addr->ip & svc->netmask;
 285
 286         IP_VS_DBG_BUF(6, "p-schedule: src %s:%u dest %s:%u "
 287                       "mnet %s\n",
 288                       IP_VS_DBG_ADDR(svc->af, src_addr), ntohs(src_port),
 289                       IP_VS_DBG_ADDR(svc->af, dst_addr), ntohs(dst_port),
 290                       IP_VS_DBG_ADDR(svc->af, &snet));
 291
 292         /*
 293          * As far as we know, FTP is a very complicated network protocol, and
 294          * it uses control connection and data connections. For active FTP,
 295          * FTP server initialize data connection to the client, its source port
 296          * is often 20. For passive FTP, FTP server tells the clients the port
 297          * that it passively listens to,  and the client issues the data
 298          * connection. In the tunneling or direct routing mode, the load
 299          * balancer is on the client-to-server half of connection, the port
 300          * number is unknown to the load balancer. So, a conn template like
 301          * <caddr, 0, vaddr, 0, daddr, 0> is created for persistent FTP
 302          * service, and a template like <caddr, 0, vaddr, vport, daddr, dport>
 303          * is created for other persistent services.
 304          */
 305         {
 306                 int protocol = iph->protocol;
 307                 const union nf_inet_addr *vaddr = dst_addr;
 308                 __be16 vport = 0;
 309
 310                 if (dst_port == svc->port) {
 311                         /* non-FTP template:
 312                          * <protocol, caddr, 0, vaddr, vport, daddr, dport>
 313                          * FTP template:
 314                          * <protocol, caddr, 0, vaddr, 0, daddr, 0>
 315                          */
 316                         if (svc->port != FTPPORT)
 317                                 vport = dst_port;
 318                 } else {
 319                         /* Note: persistent fwmark-based services and
 320                          * persistent port zero service are handled here.
 321                          * fwmark template:
 322                          * <IPPROTO_IP,caddr,0,fwmark,0,daddr,0>
 323                          * port zero template:
 324                          * <protocol,caddr,0,vaddr,0,daddr,0>
 325                          */
 326                         if (svc->fwmark) {
 327                                 protocol = IPPROTO_IP;
 328                                 vaddr = &fwmark;
 329                         }
 330                 }
 331                 /* return *ignored = -1 so NF_DROP can be used */
 332                 if (ip_vs_conn_fill_param_persist(svc, skb, protocol, &snet, 0,
 333                                                   vaddr, vport, &param) < 0) {
 334                         *ignored = -1;
 335                         return NULL;
 336                 }
 337         }
 338
 339         /* Check if a template already exists */
 340         ct = ip_vs_ct_in_get(&param);
 341         if (!ct || !ip_vs_check_template(ct, NULL)) {
 342                 struct ip_vs_scheduler *sched;
 343
 344                 /*
 345                  * No template found or the dest of the connection
 346                  * template is not available.
 347                  * return *ignored=0 i.e. ICMP and NF_DROP
 348                  */
 349                 sched = rcu_dereference(svc->scheduler);
 350                 if (sched) {
 351                         /* read svc->sched_data after svc->scheduler */
 352                         smp_rmb();
 353                         dest = sched->schedule(svc, skb, iph);
 354                 } else {
 355                         dest = NULL;
 356                 }
 357                 if (!dest) {
 358                         IP_VS_DBG(1, "p-schedule: no dest found.\n");
 359                         kfree(param.pe_data);
 360                         *ignored = 0;
 361                         return NULL;
 362                 }
 363
 364                 if (dst_port == svc->port && svc->port != FTPPORT)
 365                         dport = dest->port;
 366
 367                 /* Create a template
 368                  * This adds param.pe_data to the template,
 369                  * and thus param.pe_data will be destroyed
 370                  * when the template expires */
 371                 ct = ip_vs_conn_new(&param, dest->af, &dest->addr, dport,
 372                                     IP_VS_CONN_F_TEMPLATE, dest, skb->mark);
 373                 if (ct == NULL) {
 374                         kfree(param.pe_data);
 375                         *ignored = -1;
 376                         return NULL;
 377                 }
 378
 379                 ct->timeout = svc->timeout;
 380         } else {
 381                 /* set destination with the found template */
 382                 dest = ct->dest;
 383                 kfree(param.pe_data);
 384         }
 385
 386         dport = dst_port;
 387         if (dport == svc->port && dest->port)
 388                 dport = dest->port;
 389
 390         flags = (svc->flags & IP_VS_SVC_F_ONEPACKET
 391                  && iph->protocol == IPPROTO_UDP) ?
 392                 IP_VS_CONN_F_ONE_PACKET : 0;
 393
 394         /*
 395          *    Create a new connection according to the template
 396          */
 397         ip_vs_conn_fill_param(svc->ipvs, svc->af, iph->protocol, src_addr,
 398                               src_port, dst_addr, dst_port, &param);
 399
 400         cp = ip_vs_conn_new(&param, dest->af, &dest->addr, dport, flags, dest,
 401                             skb->mark);
 402         if (cp == NULL) {
 403                 ip_vs_conn_put(ct);
 404                 *ignored = -1;
 405                 return NULL;
 406         }
 407
 408         /*
 409          *    Add its control
 410          */
 411         ip_vs_control_add(cp, ct);
 412         ip_vs_conn_put(ct);
 413
 414         ip_vs_conn_stats(cp, svc);
 415         return cp;
 416 }
 417
 418
 419 /*
 420  *  IPVS main scheduling function
 421  *  It selects a server according to the virtual service, and
 422  *  creates a connection entry.
 423  *  Protocols supported: TCP, UDP
 424  *
 425  *  Usage of *ignored
 426  *
 427  * 1 :   protocol tried to schedule (eg. on SYN), found svc but the
 428  *       svc/scheduler decides that this packet should be accepted with
 429  *       NF_ACCEPT because it must not be scheduled.
 430  *
 431  * 0 :   scheduler can not find destination, so try bypass or
 432  *       return ICMP and then NF_DROP (ip_vs_leave).
 433  *
 434  * -1 :  scheduler tried to schedule but fatal error occurred, eg.
 435  *       ip_vs_conn_new failure (ENOMEM) or ip_vs_sip_fill_param
 436  *       failure such as missing Call-ID, ENOMEM on skb_linearize
 437  *       or pe_data. In this case we should return NF_DROP without
 438  *       any attempts to send ICMP with ip_vs_leave.
 439  */
 440 struct ip_vs_conn *
 441 ip_vs_schedule(struct ip_vs_service *svc, struct sk_buff *skb,
 442                struct ip_vs_proto_data *pd, int *ignored,
 443                struct ip_vs_iphdr *iph)
 444 {
 445         struct ip_vs_protocol *pp = pd->pp;
 446         struct ip_vs_conn *cp = NULL;
 447         struct ip_vs_scheduler *sched;
 448         struct ip_vs_dest *dest;
 449         __be16 _ports[2], *pptr, cport, vport;
 450         const void *caddr, *vaddr;
 451         unsigned int flags;
 452
 453         *ignored = 1;
 454         /*
 455          * IPv6 frags, only the first hit here.
 456          */
 457         pptr = frag_safe_skb_hp(skb, iph->len, sizeof(_ports), _ports);
 458         if (pptr == NULL)
 459                 return NULL;
 460
 461         if (likely(!ip_vs_iph_inverse(iph))) {
 462                 cport = pptr[0];
 463                 caddr = &iph->saddr;
 464                 vport = pptr[1];
 465                 vaddr = &iph->daddr;
 466         } else {
 467                 cport = pptr[1];
 468                 caddr = &iph->daddr;
 469                 vport = pptr[0];
 470                 vaddr = &iph->saddr;
 471         }
 472
 473         /*
 474          * FTPDATA needs this check when using local real server.
 475          * Never schedule Active FTPDATA connections from real server.
 476          * For LVS-NAT they must be already created. For other methods
 477          * with persistence the connection is created on SYN+ACK.
 478          */
 479         if (cport == FTPDATA) {
 480                 IP_VS_DBG_PKT(12, svc->af, pp, skb, iph->off,
 481                               "Not scheduling FTPDATA");
 482                 return NULL;
 483         }
 484
 485         /*
 486          *    Do not schedule replies from local real server.
 487          */
 488         if ((!skb->dev || skb->dev->flags & IFF_LOOPBACK)) {
 489                 iph->hdr_flags ^= IP_VS_HDR_INVERSE;
 490                 cp = INDIRECT_CALL_1(pp->conn_in_get,
 491                                      ip_vs_conn_in_get_proto, svc->ipvs,
 492                                      svc->af, skb, iph);
 493                 iph->hdr_flags ^= IP_VS_HDR_INVERSE;
 494
 495                 if (cp) {
 496                         IP_VS_DBG_PKT(12, svc->af, pp, skb, iph->off,
 497                                       "Not scheduling reply for existing"
 498                                       " connection");
 499                         __ip_vs_conn_put(cp);
 500                         return NULL;
 501                 }
 502         }
 503
 504         /*
 505          *    Persistent service
 506          */
 507         if (svc->flags & IP_VS_SVC_F_PERSISTENT)
 508                 return ip_vs_sched_persist(svc, skb, cport, vport, ignored,
 509                                            iph);
 510
 511         *ignored = 0;
 512
 513         /*
 514          *    Non-persistent service
 515          */
 516         if (!svc->fwmark && vport != svc->port) {
 517                 if (!svc->port)
 518                         pr_err("Schedule: port zero only supported "
 519                                "in persistent services, "
 520                                "check your ipvs configuration\n");
 521                 return NULL;
 522         }
 523
 524         sched = rcu_dereference(svc->scheduler);
 525         if (sched) {
 526                 /* read svc->sched_data after svc->scheduler */
 527                 smp_rmb();
 528                 dest = sched->schedule(svc, skb, iph);
 529         } else {
 530                 dest = NULL;
 531         }
 532         if (dest == NULL) {
 533                 IP_VS_DBG(1, "Schedule: no dest found.\n");
 534                 return NULL;
 535         }
 536
 537         flags = (svc->flags & IP_VS_SVC_F_ONEPACKET
 538                  && iph->protocol == IPPROTO_UDP) ?
 539                 IP_VS_CONN_F_ONE_PACKET : 0;
 540
 541         /*
 542          *    Create a connection entry.
 543          */
 544         {
 545                 struct ip_vs_conn_param p;
 546
 547                 ip_vs_conn_fill_param(svc->ipvs, svc->af, iph->protocol,
 548                                       caddr, cport, vaddr, vport, &p);
 549                 cp = ip_vs_conn_new(&p, dest->af, &dest->addr,
 550                                     dest->port ? dest->port : vport,
 551                                     flags, dest, skb->mark);
 552                 if (!cp) {
 553                         *ignored = -1;
 554                         return NULL;
 555                 }
 556         }
 557
 558         IP_VS_DBG_BUF(6, "Schedule fwd:%c c:%s:%u v:%s:%u "
 559                       "d:%s:%u conn->flags:%X conn->refcnt:%d\n",
 560                       ip_vs_fwd_tag(cp),
 561                       IP_VS_DBG_ADDR(cp->af, &cp->caddr), ntohs(cp->cport),
 562                       IP_VS_DBG_ADDR(cp->af, &cp->vaddr), ntohs(cp->vport),
 563                       IP_VS_DBG_ADDR(cp->daf, &cp->daddr), ntohs(cp->dport),
 564                       cp->flags, refcount_read(&cp->refcnt));
 565
 566         ip_vs_conn_stats(cp, svc);
 567         return cp;
 568 }
 569
 570 static inline int ip_vs_addr_is_unicast(struct net *net, int af,
 571                                         union nf_inet_addr *addr)
 572 {
 573 #ifdef CONFIG_IP_VS_IPV6
 574         if (af == AF_INET6)
 575                 return ipv6_addr_type(&addr->in6) & IPV6_ADDR_UNICAST;
 576 #endif
 577         return (inet_addr_type(net, addr->ip) == RTN_UNICAST);
 578 }
 579
 580 /*
 581  *  Pass or drop the packet.
 582  *  Called by ip_vs_in, when the virtual service is available but
 583  *  no destination is available for a new connection.
 584  */
 585 int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb,
 586                 struct ip_vs_proto_data *pd, struct ip_vs_iphdr *iph)
 587 {
 588         __be16 _ports[2], *pptr, dport;
 589         struct netns_ipvs *ipvs = svc->ipvs;
 590         struct net *net = ipvs->net;
 591
 592         pptr = frag_safe_skb_hp(skb, iph->len, sizeof(_ports), _ports);
 593         if (!pptr)
 594                 return NF_DROP;
 595         dport = likely(!ip_vs_iph_inverse(iph)) ? pptr[1] : pptr[0];
 596
 597         /* if it is fwmark-based service, the cache_bypass sysctl is up
 598            and the destination is a non-local unicast, then create
 599            a cache_bypass connection entry */
 600         if (sysctl_cache_bypass(ipvs) && svc->fwmark &&
 601             !(iph->hdr_flags & (IP_VS_HDR_INVERSE | IP_VS_HDR_ICMP)) &&
 602             ip_vs_addr_is_unicast(net, svc->af, &iph->daddr)) {
 603                 int ret;
 604                 struct ip_vs_conn *cp;
 605                 unsigned int flags = (svc->flags & IP_VS_SVC_F_ONEPACKET &&
 606                                       iph->protocol == IPPROTO_UDP) ?
 607                                       IP_VS_CONN_F_ONE_PACKET : 0;
 608                 union nf_inet_addr daddr = { .all = { 0, 0, 0, 0 } };
 609
 610                 /* create a new connection entry */
 611                 IP_VS_DBG(6, "%s(): create a cache_bypass entry\n", __func__);
 612                 {
 613                         struct ip_vs_conn_param p;
 614                         ip_vs_conn_fill_param(svc->ipvs, svc->af, iph->protocol,
 615                                               &iph->saddr, pptr[0],
 616                                               &iph->daddr, pptr[1], &p);
 617                         cp = ip_vs_conn_new(&p, svc->af, &daddr, 0,
 618                                             IP_VS_CONN_F_BYPASS | flags,
 619                                             NULL, skb->mark);
 620                         if (!cp)
 621                                 return NF_DROP;
 622                 }
 623
 624                 /* statistics */
 625                 ip_vs_in_stats(cp, skb);
 626
 627                 /* set state */
 628                 ip_vs_set_state(cp, IP_VS_DIR_INPUT, skb, pd);
 629
 630                 /* transmit the first SYN packet */
 631                 ret = cp->packet_xmit(skb, cp, pd->pp, iph);
 632                 /* do not touch skb anymore */
 633
 634                 if ((cp->flags & IP_VS_CONN_F_ONE_PACKET) && cp->control)
 635                         atomic_inc(&cp->control->in_pkts);
 636                 else
 637                         atomic_inc(&cp->in_pkts);
 638                 ip_vs_conn_put(cp);
 639                 return ret;
 640         }
 641
 642         /*
 643          * When the virtual ftp service is presented, packets destined
 644          * for other services on the VIP may get here (except services
 645          * listed in the ipvs table), pass the packets, because it is
 646          * not ipvs job to decide to drop the packets.
 647          */
 648         if (svc->port == FTPPORT && dport != FTPPORT)
 649                 return NF_ACCEPT;
 650
 651         if (unlikely(ip_vs_iph_icmp(iph)))
 652                 return NF_DROP;
 653
 654         /*
 655          * Notify the client that the destination is unreachable, and
 656          * release the socket buffer.
 657          * Since it is in IP layer, the TCP socket is not actually
 658          * created, the TCP RST packet cannot be sent, instead that
 659          * ICMP_PORT_UNREACH is sent here no matter it is TCP/UDP. --WZ
 660          */
 661 #ifdef CONFIG_IP_VS_IPV6
 662         if (svc->af == AF_INET6) {
 663                 if (!skb->dev)
 664                         skb->dev = net->loopback_dev;
 665                 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
 666         } else
 667 #endif
 668                 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0);
 669
 670         return NF_DROP;
 671 }
 672
 673 #ifdef CONFIG_SYSCTL
 674
 675 static int sysctl_snat_reroute(struct netns_ipvs *ipvs)
 676 {
 677         return ipvs->sysctl_snat_reroute;
 678 }
 679
 680 static int sysctl_nat_icmp_send(struct netns_ipvs *ipvs)
 681 {
 682         return ipvs->sysctl_nat_icmp_send;
 683 }
 684
 685 #else
 686
 687 static int sysctl_snat_reroute(struct netns_ipvs *ipvs) { return 0; }
 688 static int sysctl_nat_icmp_send(struct netns_ipvs *ipvs) { return 0; }
 689
 690 #endif
 691
 692 __sum16 ip_vs_checksum_complete(struct sk_buff *skb, int offset)
 693 {
 694         return csum_fold(skb_checksum(skb, offset, skb->len - offset, 0));
 695 }
 696
 697 static inline enum ip_defrag_users ip_vs_defrag_user(unsigned int hooknum)
 698 {
 699         if (NF_INET_LOCAL_IN == hooknum)
 700                 return IP_DEFRAG_VS_IN;
 701         if (NF_INET_FORWARD == hooknum)
 702                 return IP_DEFRAG_VS_FWD;
 703         return IP_DEFRAG_VS_OUT;
 704 }
 705
 706 static inline int ip_vs_gather_frags(struct netns_ipvs *ipvs,
 707                                      struct sk_buff *skb, u_int32_t user)
 708 {
 709         int err;
 710
 711         local_bh_disable();
 712         err = ip_defrag(ipvs->net, skb, user);
 713         local_bh_enable();
 714         if (!err)
 715                 ip_send_check(ip_hdr(skb));
 716
 717         return err;
 718 }
 719
 720 static int ip_vs_route_me_harder(struct netns_ipvs *ipvs, int af,
 721                                  struct sk_buff *skb, unsigned int hooknum)
 722 {
 723         if (!sysctl_snat_reroute(ipvs))
 724                 return 0;
 725         /* Reroute replies only to remote clients (FORWARD and LOCAL_OUT) */
 726         if (NF_INET_LOCAL_IN == hooknum)
 727                 return 0;
 728 #ifdef CONFIG_IP_VS_IPV6
 729         if (af == AF_INET6) {
 730                 struct dst_entry *dst = skb_dst(skb);
 731
 732                 if (dst->dev && !(dst->dev->flags & IFF_LOOPBACK) &&
 733                     ip6_route_me_harder(ipvs->net, skb->sk, skb) != 0)
 734                         return 1;
 735         } else
 736 #endif
 737                 if (!(skb_rtable(skb)->rt_flags & RTCF_LOCAL) &&
 738                     ip_route_me_harder(ipvs->net, skb->sk, skb, RTN_LOCAL) != 0)
 739                         return 1;
 740
 741         return 0;
 742 }
 743
 744 /*
 745  * Packet has been made sufficiently writable in caller
 746  * - inout: 1=in->out, 0=out->in
 747  */
 748 void ip_vs_nat_icmp(struct sk_buff *skb, struct ip_vs_protocol *pp,
 749                     struct ip_vs_conn *cp, int inout)
 750 {
 751         struct iphdr *iph        = ip_hdr(skb);
 752         unsigned int icmp_offset = iph->ihl*4;
 753         struct icmphdr *icmph    = (struct icmphdr *)(skb_network_header(skb) +
 754                                                       icmp_offset);
 755         struct iphdr *ciph       = (struct iphdr *)(icmph + 1);
 756
 757         if (inout) {
 758                 iph->saddr = cp->vaddr.ip;
 759                 ip_send_check(iph);
 760                 ciph->daddr = cp->vaddr.ip;
 761                 ip_send_check(ciph);
 762         } else {
 763                 iph->daddr = cp->daddr.ip;
 764                 ip_send_check(iph);
 765                 ciph->saddr = cp->daddr.ip;
 766                 ip_send_check(ciph);
 767         }
 768
 769         /* the TCP/UDP/SCTP port */
 770         if (IPPROTO_TCP == ciph->protocol || IPPROTO_UDP == ciph->protocol ||
 771             IPPROTO_SCTP == ciph->protocol) {
 772                 __be16 *ports = (void *)ciph + ciph->ihl*4;
 773
 774                 if (inout)
 775                         ports[1] = cp->vport;
 776                 else
 777                         ports[0] = cp->dport;
 778         }
 779
 780         /* And finally the ICMP checksum */
 781         icmph->checksum = 0;
 782         icmph->checksum = ip_vs_checksum_complete(skb, icmp_offset);
 783         skb->ip_summed = CHECKSUM_UNNECESSARY;
 784
 785         if (inout)
 786                 IP_VS_DBG_PKT(11, AF_INET, pp, skb, (void *)ciph - (void *)iph,
 787                         "Forwarding altered outgoing ICMP");
 788         else
 789                 IP_VS_DBG_PKT(11, AF_INET, pp, skb, (void *)ciph - (void *)iph,
 790                         "Forwarding altered incoming ICMP");
 791 }
 792
 793 #ifdef CONFIG_IP_VS_IPV6
 794 void ip_vs_nat_icmp_v6(struct sk_buff *skb, struct ip_vs_protocol *pp,
 795                     struct ip_vs_conn *cp, int inout)
 796 {
 797         struct ipv6hdr *iph      = ipv6_hdr(skb);
 798         unsigned int icmp_offset = 0;
 799         unsigned int offs        = 0; /* header offset*/
 800         int protocol;
 801         struct icmp6hdr *icmph;
 802         struct ipv6hdr *ciph;
 803         unsigned short fragoffs;
 804
 805         ipv6_find_hdr(skb, &icmp_offset, IPPROTO_ICMPV6, &fragoffs, NULL);
 806         icmph = (struct icmp6hdr *)(skb_network_header(skb) + icmp_offset);
 807         offs = icmp_offset + sizeof(struct icmp6hdr);
 808         ciph = (struct ipv6hdr *)(skb_network_header(skb) + offs);
 809
 810         protocol = ipv6_find_hdr(skb, &offs, -1, &fragoffs, NULL);
 811
 812         if (inout) {
 813                 iph->saddr = cp->vaddr.in6;
 814                 ciph->daddr = cp->vaddr.in6;
 815         } else {
 816                 iph->daddr = cp->daddr.in6;
 817                 ciph->saddr = cp->daddr.in6;
 818         }
 819
 820         /* the TCP/UDP/SCTP port */
 821         if (!fragoffs && (IPPROTO_TCP == protocol || IPPROTO_UDP == protocol ||
 822                           IPPROTO_SCTP == protocol)) {
 823                 __be16 *ports = (void *)(skb_network_header(skb) + offs);
 824
 825                 IP_VS_DBG(11, "%s() changed port %d to %d\n", __func__,
 826                               ntohs(inout ? ports[1] : ports[0]),
 827                               ntohs(inout ? cp->vport : cp->dport));
 828                 if (inout)
 829                         ports[1] = cp->vport;
 830                 else
 831                         ports[0] = cp->dport;
 832         }
 833
 834         /* And finally the ICMP checksum */
 835         icmph->icmp6_cksum = ~csum_ipv6_magic(&iph->saddr, &iph->daddr,
 836                                               skb->len - icmp_offset,
 837                                               IPPROTO_ICMPV6, 0);
 838         skb->csum_start = skb_network_header(skb) - skb->head + icmp_offset;
 839         skb->csum_offset = offsetof(struct icmp6hdr, icmp6_cksum);
 840         skb->ip_summed = CHECKSUM_PARTIAL;
 841
 842         if (inout)
 843                 IP_VS_DBG_PKT(11, AF_INET6, pp, skb,
 844                               (void *)ciph - (void *)iph,
 845                               "Forwarding altered outgoing ICMPv6");
 846         else
 847                 IP_VS_DBG_PKT(11, AF_INET6, pp, skb,
 848                               (void *)ciph - (void *)iph,
 849                               "Forwarding altered incoming ICMPv6");
 850 }
 851 #endif
 852
 853 /* Handle relevant response ICMP messages - forward to the right
 854  * destination host.
 855  */
 856 static int handle_response_icmp(int af, struct sk_buff *skb,
 857                                 union nf_inet_addr *snet,
 858                                 __u8 protocol, struct ip_vs_conn *cp,
 859                                 struct ip_vs_protocol *pp,
 860                                 unsigned int offset, unsigned int ihl,
 861                                 unsigned int hooknum)
 862 {
 863         unsigned int verdict = NF_DROP;
 864
 865         if (IP_VS_FWD_METHOD(cp) != IP_VS_CONN_F_MASQ)
 866                 goto after_nat;
 867
 868         /* Ensure the checksum is correct */
 869         if (!skb_csum_unnecessary(skb) && ip_vs_checksum_complete(skb, ihl)) {
 870                 /* Failed checksum! */
 871                 IP_VS_DBG_BUF(1, "Forward ICMP: failed checksum from %s!\n",
 872                               IP_VS_DBG_ADDR(af, snet));
 873                 goto out;
 874         }
 875
 876         if (IPPROTO_TCP == protocol || IPPROTO_UDP == protocol ||
 877             IPPROTO_SCTP == protocol)
 878                 offset += 2 * sizeof(__u16);
 879         if (skb_ensure_writable(skb, offset))
 880                 goto out;
 881
 882 #ifdef CONFIG_IP_VS_IPV6
 883         if (af == AF_INET6)
 884                 ip_vs_nat_icmp_v6(skb, pp, cp, 1);
 885         else
 886 #endif
 887                 ip_vs_nat_icmp(skb, pp, cp, 1);
 888
 889         if (ip_vs_route_me_harder(cp->ipvs, af, skb, hooknum))
 890                 goto out;
 891
 892 after_nat:
 893         /* do the statistics and put it back */
 894         ip_vs_out_stats(cp, skb);
 895
 896         skb->ipvs_property = 1;
 897         if (!(cp->flags & IP_VS_CONN_F_NFCT))
 898                 ip_vs_notrack(skb);
 899         else
 900                 ip_vs_update_conntrack(skb, cp, 0);
 901         verdict = NF_ACCEPT;
 902
 903 out:
 904         __ip_vs_conn_put(cp);
 905
 906         return verdict;
 907 }
 908
 909 /*
 910  *      Handle ICMP messages in the inside-to-outside direction (outgoing).
 911  *      Find any that might be relevant, check against existing connections.
 912  *      Currently handles error types - unreachable, quench, ttl exceeded.
 913  */
 914 static int ip_vs_out_icmp(struct netns_ipvs *ipvs, struct sk_buff *skb,
 915                           int *related, unsigned int hooknum)
 916 {
 917         struct iphdr *iph;
 918         struct icmphdr  _icmph, *ic;
 919         struct iphdr    _ciph, *cih;    /* The ip header contained within the ICMP */
 920         struct ip_vs_iphdr ciph;
 921         struct ip_vs_conn *cp;
 922         struct ip_vs_protocol *pp;
 923         unsigned int offset, ihl;
 924         union nf_inet_addr snet;
 925
 926         *related = 1;
 927
 928         /* reassemble IP fragments */
 929         if (ip_is_fragment(ip_hdr(skb))) {
 930                 if (ip_vs_gather_frags(ipvs, skb, ip_vs_defrag_user(hooknum)))
 931                         return NF_STOLEN;
 932         }
 933
 934         iph = ip_hdr(skb);
 935         offset = ihl = iph->ihl * 4;
 936         ic = skb_header_pointer(skb, offset, sizeof(_icmph), &_icmph);
 937         if (ic == NULL)
 938                 return NF_DROP;
 939
 940         IP_VS_DBG(12, "Outgoing ICMP (%d,%d) %pI4->%pI4\n",
 941                   ic->type, ntohs(icmp_id(ic)),
 942                   &iph->saddr, &iph->daddr);
 943
 944         /*
 945          * Work through seeing if this is for us.
 946          * These checks are supposed to be in an order that means easy
 947          * things are checked first to speed up processing.... however
 948          * this means that some packets will manage to get a long way
 949          * down this stack and then be rejected, but that's life.
 950          */
 951         if ((ic->type != ICMP_DEST_UNREACH) &&
 952             (ic->type != ICMP_SOURCE_QUENCH) &&
 953             (ic->type != ICMP_TIME_EXCEEDED)) {
 954                 *related = 0;
 955                 return NF_ACCEPT;
 956         }
 957
 958         /* Now find the contained IP header */
 959         offset += sizeof(_icmph);
 960         cih = skb_header_pointer(skb, offset, sizeof(_ciph), &_ciph);
 961         if (cih == NULL)
 962                 return NF_ACCEPT; /* The packet looks wrong, ignore */
 963
 964         pp = ip_vs_proto_get(cih->protocol);
 965         if (!pp)
 966                 return NF_ACCEPT;
 967
 968         /* Is the embedded protocol header present? */
 969         if (unlikely(cih->frag_off & htons(IP_OFFSET) &&
 970                      pp->dont_defrag))
 971                 return NF_ACCEPT;
 972
 973         IP_VS_DBG_PKT(11, AF_INET, pp, skb, offset,
 974                       "Checking outgoing ICMP for");
 975
 976         ip_vs_fill_iph_skb_icmp(AF_INET, skb, offset, true, &ciph);
 977
 978         /* The embedded headers contain source and dest in reverse order */
 979         cp = INDIRECT_CALL_1(pp->conn_out_get, ip_vs_conn_out_get_proto,
 980                              ipvs, AF_INET, skb, &ciph);
 981         if (!cp)
 982                 return NF_ACCEPT;
 983
 984         snet.ip = iph->saddr;
 985         return handle_response_icmp(AF_INET, skb, &snet, cih->protocol, cp,
 986                                     pp, ciph.len, ihl, hooknum);
 987 }
 988
 989 #ifdef CONFIG_IP_VS_IPV6
 990 static int ip_vs_out_icmp_v6(struct netns_ipvs *ipvs, struct sk_buff *skb,
 991                              int *related,  unsigned int hooknum,
 992                              struct ip_vs_iphdr *ipvsh)
 993 {
 994         struct icmp6hdr _icmph, *ic;
 995         struct ip_vs_iphdr ciph = {.flags = 0, .fragoffs = 0};/*Contained IP */
 996         struct ip_vs_conn *cp;
 997         struct ip_vs_protocol *pp;
 998         union nf_inet_addr snet;
 999         unsigned int offset;
1000
1001         *related = 1;
1002         ic = frag_safe_skb_hp(skb, ipvsh->len, sizeof(_icmph), &_icmph);
1003         if (ic == NULL)
1004                 return NF_DROP;
1005
1006         /*
1007          * Work through seeing if this is for us.
1008          * These checks are supposed to be in an order that means easy
1009          * things are checked first to speed up processing.... however
1010          * this means that some packets will manage to get a long way
1011          * down this stack and then be rejected, but that's life.
1012          */
1013         if (ic->icmp6_type & ICMPV6_INFOMSG_MASK) {
1014                 *related = 0;
1015                 return NF_ACCEPT;
1016         }
1017         /* Fragment header that is before ICMP header tells us that:
1018          * it's not an error message since they can't be fragmented.
1019          */
1020         if (ipvsh->flags & IP6_FH_F_FRAG)
1021                 return NF_DROP;
1022
1023         IP_VS_DBG(8, "Outgoing ICMPv6 (%d,%d) %pI6c->%pI6c\n",
1024                   ic->icmp6_type, ntohs(icmpv6_id(ic)),
1025                   &ipvsh->saddr, &ipvsh->daddr);
1026
1027         if (!ip_vs_fill_iph_skb_icmp(AF_INET6, skb, ipvsh->len + sizeof(_icmph),
1028                                      true, &ciph))
1029                 return NF_ACCEPT; /* The packet looks wrong, ignore */
1030
1031         pp = ip_vs_proto_get(ciph.protocol);
1032         if (!pp)
1033                 return NF_ACCEPT;
1034
1035         /* The embedded headers contain source and dest in reverse order */
1036         cp = INDIRECT_CALL_1(pp->conn_out_get, ip_vs_conn_out_get_proto,
1037                              ipvs, AF_INET6, skb, &ciph);
1038         if (!cp)
1039                 return NF_ACCEPT;
1040
1041         snet.in6 = ciph.saddr.in6;
1042         offset = ciph.len;
1043         return handle_response_icmp(AF_INET6, skb, &snet, ciph.protocol, cp,
1044                                     pp, offset, sizeof(struct ipv6hdr),
1045                                     hooknum);
1046 }
1047 #endif
1048
1049 /*
1050  * Check if sctp chunc is ABORT chunk
1051  */
1052 static inline int is_sctp_abort(const struct sk_buff *skb, int nh_len)
1053 {
1054         struct sctp_chunkhdr *sch, schunk;
1055         sch = skb_header_pointer(skb, nh_len + sizeof(struct sctphdr),
1056                                  sizeof(schunk), &schunk);
1057         if (sch == NULL)
1058                 return 0;
1059         if (sch->type == SCTP_CID_ABORT)
1060                 return 1;
1061         return 0;
1062 }
1063
1064 static inline int is_tcp_reset(const struct sk_buff *skb, int nh_len)
1065 {
1066         struct tcphdr _tcph, *th;
1067
1068         th = skb_header_pointer(skb, nh_len, sizeof(_tcph), &_tcph);
1069         if (th == NULL)
1070                 return 0;
1071         return th->rst;
1072 }
1073
1074 static inline bool is_new_conn(const struct sk_buff *skb,
1075                                struct ip_vs_iphdr *iph)
1076 {
1077         switch (iph->protocol) {
1078         case IPPROTO_TCP: {
1079                 struct tcphdr _tcph, *th;
1080
1081                 th = skb_header_pointer(skb, iph->len, sizeof(_tcph), &_tcph);
1082                 if (th == NULL)
1083                         return false;
1084                 return th->syn;
1085         }
1086         case IPPROTO_SCTP: {
1087                 struct sctp_chunkhdr *sch, schunk;
1088
1089                 sch = skb_header_pointer(skb, iph->len + sizeof(struct sctphdr),
1090                                          sizeof(schunk), &schunk);
1091                 if (sch == NULL)
1092                         return false;
1093                 return sch->type == SCTP_CID_INIT;
1094         }
1095         default:
1096                 return false;
1097         }
1098 }
1099
1100 static inline bool is_new_conn_expected(const struct ip_vs_conn *cp,
1101                                         int conn_reuse_mode)
1102 {
1103         /* Controlled (FTP DATA or persistence)? */
1104         if (cp->control)
1105                 return false;
1106
1107         switch (cp->protocol) {
1108         case IPPROTO_TCP:
1109                 return (cp->state == IP_VS_TCP_S_TIME_WAIT) ||
1110                        (cp->state == IP_VS_TCP_S_CLOSE) ||
1111                         ((conn_reuse_mode & 2) &&
1112                          (cp->state == IP_VS_TCP_S_FIN_WAIT) &&
1113                          (cp->flags & IP_VS_CONN_F_NOOUTPUT));
1114         case IPPROTO_SCTP:
1115                 return cp->state == IP_VS_SCTP_S_CLOSED;
1116         default:
1117                 return false;
1118         }
1119 }
1120
1121 /* Generic function to create new connections for outgoing RS packets
1122  *
1123  * Pre-requisites for successful connection creation:
1124  * 1) Virtual Service is NOT fwmark based:
1125  *    In fwmark-VS actual vaddr and vport are unknown to IPVS
1126  * 2) Real Server and Virtual Service were NOT configured without port:
1127  *    This is to allow match of different VS to the same RS ip-addr
1128  */
1129 struct ip_vs_conn *ip_vs_new_conn_out(struct ip_vs_service *svc,
1130                                       struct ip_vs_dest *dest,
1131                                       struct sk_buff *skb,
1132                                       const struct ip_vs_iphdr *iph,
1133                                       __be16 dport,
1134                                       __be16 cport)
1135 {
1136         struct ip_vs_conn_param param;
1137         struct ip_vs_conn *ct = NULL, *cp = NULL;
1138         const union nf_inet_addr *vaddr, *daddr, *caddr;
1139         union nf_inet_addr snet;
1140         __be16 vport;
1141         unsigned int flags;
1142
1143         vaddr = &svc->addr;
1144         vport = svc->port;
1145         daddr = &iph->saddr;
1146         caddr = &iph->daddr;
1147
1148         /* check pre-requisites are satisfied */
1149         if (svc->fwmark)
1150                 return NULL;
1151         if (!vport || !dport)
1152                 return NULL;
1153
1154         /* for persistent service first create connection template */
1155         if (svc->flags & IP_VS_SVC_F_PERSISTENT) {
1156                 /* apply netmask the same way ingress-side does */
1157 #ifdef CONFIG_IP_VS_IPV6
1158                 if (svc->af == AF_INET6)
1159                         ipv6_addr_prefix(&snet.in6, &caddr->in6,
1160                                          (__force __u32)svc->netmask);
1161                 else
1162 #endif
1163                         snet.ip = caddr->ip & svc->netmask;
1164                 /* fill params and create template if not existent */
1165                 if (ip_vs_conn_fill_param_persist(svc, skb, iph->protocol,
1166                                                   &snet, 0, vaddr,
1167                                                   vport, &param) < 0)
1168                         return NULL;
1169                 ct = ip_vs_ct_in_get(&param);
1170                 /* check if template exists and points to the same dest */
1171                 if (!ct || !ip_vs_check_template(ct, dest)) {
1172                         ct = ip_vs_conn_new(&param, dest->af, daddr, dport,
1173                                             IP_VS_CONN_F_TEMPLATE, dest, 0);
1174                         if (!ct) {
1175                                 kfree(param.pe_data);
1176                                 return NULL;
1177                         }
1178                         ct->timeout = svc->timeout;
1179                 } else {
1180                         kfree(param.pe_data);
1181                 }
1182         }
1183
1184         /* connection flags */
1185         flags = ((svc->flags & IP_VS_SVC_F_ONEPACKET) &&
1186                  iph->protocol == IPPROTO_UDP) ? IP_VS_CONN_F_ONE_PACKET : 0;
1187         /* create connection */
1188         ip_vs_conn_fill_param(svc->ipvs, svc->af, iph->protocol,
1189                               caddr, cport, vaddr, vport, &param);
1190         cp = ip_vs_conn_new(&param, dest->af, daddr, dport, flags, dest, 0);
1191         if (!cp) {
1192                 if (ct)
1193                         ip_vs_conn_put(ct);
1194                 return NULL;
1195         }
1196         if (ct) {
1197                 ip_vs_control_add(cp, ct);
1198                 ip_vs_conn_put(ct);
1199         }
1200         ip_vs_conn_stats(cp, svc);
1201
1202         /* return connection (will be used to handle outgoing packet) */
1203         IP_VS_DBG_BUF(6, "New connection RS-initiated:%c c:%s:%u v:%s:%u "
1204                       "d:%s:%u conn->flags:%X conn->refcnt:%d\n",
1205                       ip_vs_fwd_tag(cp),
1206                       IP_VS_DBG_ADDR(cp->af, &cp->caddr), ntohs(cp->cport),
1207                       IP_VS_DBG_ADDR(cp->af, &cp->vaddr), ntohs(cp->vport),
1208                       IP_VS_DBG_ADDR(cp->af, &cp->daddr), ntohs(cp->dport),
1209                       cp->flags, refcount_read(&cp->refcnt));
1210         return cp;
1211 }
1212
1213 /* Handle outgoing packets which are considered requests initiated by
1214  * real servers, so that subsequent responses from external client can be
1215  * routed to the right real server.
1216  * Used also for outgoing responses in OPS mode.
1217  *
1218  * Connection management is handled by persistent-engine specific callback.
1219  */
1220 static struct ip_vs_conn *__ip_vs_rs_conn_out(unsigned int hooknum,
1221                                               struct netns_ipvs *ipvs,
1222                                               int af, struct sk_buff *skb,
1223                                               const struct ip_vs_iphdr *iph)
1224 {
1225         struct ip_vs_dest *dest;
1226         struct ip_vs_conn *cp = NULL;
1227         __be16 _ports[2], *pptr;
1228
1229         if (hooknum == NF_INET_LOCAL_IN)
1230                 return NULL;
1231
1232         pptr = frag_safe_skb_hp(skb, iph->len,
1233                                 sizeof(_ports), _ports);
1234         if (!pptr)
1235                 return NULL;
1236
1237         dest = ip_vs_find_real_service(ipvs, af, iph->protocol,
1238                                        &iph->saddr, pptr[0]);
1239         if (dest) {
1240                 struct ip_vs_service *svc;
1241                 struct ip_vs_pe *pe;
1242
1243                 svc = rcu_dereference(dest->svc);
1244                 if (svc) {
1245                         pe = rcu_dereference(svc->pe);
1246                         if (pe && pe->conn_out)
1247                                 cp = pe->conn_out(svc, dest, skb, iph,
1248                                                   pptr[0], pptr[1]);
1249                 }
1250         }
1251
1252         return cp;
1253 }
1254
1255 /* Handle response packets: rewrite addresses and send away...
1256  */
1257 static unsigned int
1258 handle_response(int af, struct sk_buff *skb, struct ip_vs_proto_data *pd,
1259                 struct ip_vs_conn *cp, struct ip_vs_iphdr *iph,
1260                 unsigned int hooknum)
1261 {
1262         struct ip_vs_protocol *pp = pd->pp;
1263
1264         if (IP_VS_FWD_METHOD(cp) != IP_VS_CONN_F_MASQ)
1265                 goto after_nat;
1266
1267         IP_VS_DBG_PKT(11, af, pp, skb, iph->off, "Outgoing packet");
1268
1269         if (skb_ensure_writable(skb, iph->len))
1270                 goto drop;
1271
1272         /* mangle the packet */
1273         if (pp->snat_handler &&
1274             !SNAT_CALL(pp->snat_handler, skb, pp, cp, iph))
1275                 goto drop;
1276
1277 #ifdef CONFIG_IP_VS_IPV6
1278         if (af == AF_INET6)
1279                 ipv6_hdr(skb)->saddr = cp->vaddr.in6;
1280         else
1281 #endif
1282         {
1283                 ip_hdr(skb)->saddr = cp->vaddr.ip;
1284                 ip_send_check(ip_hdr(skb));
1285         }
1286
1287         /*
1288          * nf_iterate does not expect change in the skb->dst->dev.
1289          * It looks like it is not fatal to enable this code for hooks
1290          * where our handlers are at the end of the chain list and
1291          * when all next handlers use skb->dst->dev and not outdev.
1292          * It will definitely route properly the inout NAT traffic
1293          * when multiple paths are used.
1294          */
1295
1296         /* For policy routing, packets originating from this
1297          * machine itself may be routed differently to packets
1298          * passing through.  We want this packet to be routed as
1299          * if it came from this machine itself.  So re-compute
1300          * the routing information.
1301          */
1302         if (ip_vs_route_me_harder(cp->ipvs, af, skb, hooknum))
1303                 goto drop;
1304
1305         IP_VS_DBG_PKT(10, af, pp, skb, iph->off, "After SNAT");
1306
1307 after_nat:
1308         ip_vs_out_stats(cp, skb);
1309         ip_vs_set_state(cp, IP_VS_DIR_OUTPUT, skb, pd);
1310         skb->ipvs_property = 1;
1311         if (!(cp->flags & IP_VS_CONN_F_NFCT))
1312                 ip_vs_notrack(skb);
1313         else
1314                 ip_vs_update_conntrack(skb, cp, 0);
1315         ip_vs_conn_put(cp);
1316
1317         return NF_ACCEPT;
1318
1319 drop:
1320         ip_vs_conn_put(cp);
1321         kfree_skb(skb);
1322         return NF_STOLEN;
1323 }
1324
1325 /*
1326  *      Check if outgoing packet belongs to the established ip_vs_conn.
1327  */
1328 static unsigned int
1329 ip_vs_out_hook(void *priv, struct sk_buff *skb, const struct nf_hook_state *state)
1330 {
1331         struct netns_ipvs *ipvs = net_ipvs(state->net);
1332         unsigned int hooknum = state->hook;
1333         struct ip_vs_iphdr iph;
1334         struct ip_vs_protocol *pp;
1335         struct ip_vs_proto_data *pd;
1336         struct ip_vs_conn *cp;
1337         int af = state->pf;
1338         struct sock *sk;
1339
1340         /* Already marked as IPVS request or reply? */
1341         if (skb->ipvs_property)
1342                 return NF_ACCEPT;
1343
1344         sk = skb_to_full_sk(skb);
1345         /* Bad... Do not break raw sockets */
1346         if (unlikely(sk && hooknum == NF_INET_LOCAL_OUT &&
1347                      af == AF_INET)) {
1348
1349                 if (sk->sk_family == PF_INET && inet_test_bit(NODEFRAG, sk))
1350                         return NF_ACCEPT;
1351         }
1352
1353         if (unlikely(!skb_dst(skb)))
1354                 return NF_ACCEPT;
1355
1356         if (!ipvs->enable)
1357                 return NF_ACCEPT;
1358
1359         ip_vs_fill_iph_skb(af, skb, false, &iph);
1360 #ifdef CONFIG_IP_VS_IPV6
1361         if (af == AF_INET6) {
1362                 if (unlikely(iph.protocol == IPPROTO_ICMPV6)) {
1363                         int related;
1364                         int verdict = ip_vs_out_icmp_v6(ipvs, skb, &related,
1365                                                         hooknum, &iph);
1366
1367                         if (related)
1368                                 return verdict;
1369                 }
1370         } else
1371 #endif
1372                 if (unlikely(iph.protocol == IPPROTO_ICMP)) {
1373                         int related;
1374                         int verdict = ip_vs_out_icmp(ipvs, skb, &related, hooknum);
1375
1376                         if (related)
1377                                 return verdict;
1378                 }
1379
1380         pd = ip_vs_proto_data_get(ipvs, iph.protocol);
1381         if (unlikely(!pd))
1382                 return NF_ACCEPT;
1383         pp = pd->pp;
1384
1385         /* reassemble IP fragments */
1386 #ifdef CONFIG_IP_VS_IPV6
1387         if (af == AF_INET)
1388 #endif
1389                 if (unlikely(ip_is_fragment(ip_hdr(skb)) && !pp->dont_defrag)) {
1390                         if (ip_vs_gather_frags(ipvs, skb,
1391                                                ip_vs_defrag_user(hooknum)))
1392                                 return NF_STOLEN;
1393
1394                         ip_vs_fill_iph_skb(AF_INET, skb, false, &iph);
1395                 }
1396
1397         /*
1398          * Check if the packet belongs to an existing entry
1399          */
1400         cp = INDIRECT_CALL_1(pp->conn_out_get, ip_vs_conn_out_get_proto,
1401                              ipvs, af, skb, &iph);
1402
1403         if (likely(cp))
1404                 return handle_response(af, skb, pd, cp, &iph, hooknum);
1405
1406         /* Check for real-server-started requests */
1407         if (atomic_read(&ipvs->conn_out_counter)) {
1408                 /* Currently only for UDP:
1409                  * connection oriented protocols typically use
1410                  * ephemeral ports for outgoing connections, so
1411                  * related incoming responses would not match any VS
1412                  */
1413                 if (pp->protocol == IPPROTO_UDP) {
1414                         cp = __ip_vs_rs_conn_out(hooknum, ipvs, af, skb, &iph);
1415                         if (likely(cp))
1416                                 return handle_response(af, skb, pd, cp, &iph,
1417                                                        hooknum);
1418                 }
1419         }
1420
1421         if (sysctl_nat_icmp_send(ipvs) &&
1422             (pp->protocol == IPPROTO_TCP ||
1423              pp->protocol == IPPROTO_UDP ||
1424              pp->protocol == IPPROTO_SCTP)) {
1425                 __be16 _ports[2], *pptr;
1426
1427                 pptr = frag_safe_skb_hp(skb, iph.len,
1428                                          sizeof(_ports), _ports);
1429                 if (pptr == NULL)
1430                         return NF_ACCEPT;       /* Not for me */
1431                 if (ip_vs_has_real_service(ipvs, af, iph.protocol, &iph.saddr,
1432                                            pptr[0])) {
1433                         /*
1434                          * Notify the real server: there is no
1435                          * existing entry if it is not RST
1436                          * packet or not TCP packet.
1437                          */
1438                         if ((iph.protocol != IPPROTO_TCP &&
1439                              iph.protocol != IPPROTO_SCTP)
1440                              || ((iph.protocol == IPPROTO_TCP
1441                                   && !is_tcp_reset(skb, iph.len))
1442                                  || (iph.protocol == IPPROTO_SCTP
1443                                         && !is_sctp_abort(skb,
1444                                                 iph.len)))) {
1445 #ifdef CONFIG_IP_VS_IPV6
1446                                 if (af == AF_INET6) {
1447                                         if (!skb->dev)
1448                                                 skb->dev = ipvs->net->loopback_dev;
1449                                         icmpv6_send(skb,
1450                                                     ICMPV6_DEST_UNREACH,
1451                                                     ICMPV6_PORT_UNREACH,
1452                                                     0);
1453                                 } else
1454 #endif
1455                                         icmp_send(skb,
1456                                                   ICMP_DEST_UNREACH,
1457                                                   ICMP_PORT_UNREACH, 0);
1458                                 return NF_DROP;
1459                         }
1460                 }
1461         }
1462
1463         IP_VS_DBG_PKT(12, af, pp, skb, iph.off,
1464                       "ip_vs_out: packet continues traversal as normal");
1465         return NF_ACCEPT;
1466 }
1467
1468 static unsigned int
1469 ip_vs_try_to_schedule(struct netns_ipvs *ipvs, int af, struct sk_buff *skb,
1470                       struct ip_vs_proto_data *pd,
1471                       int *verdict, struct ip_vs_conn **cpp,
1472                       struct ip_vs_iphdr *iph)
1473 {
1474         struct ip_vs_protocol *pp = pd->pp;
1475
1476         if (!iph->fragoffs) {
1477                 /* No (second) fragments need to enter here, as nf_defrag_ipv6
1478                  * replayed fragment zero will already have created the cp
1479                  */
1480
1481                 /* Schedule and create new connection entry into cpp */
1482                 if (!pp->conn_schedule(ipvs, af, skb, pd, verdict, cpp, iph))
1483                         return 0;
1484         }
1485
1486         if (unlikely(!*cpp)) {
1487                 /* sorry, all this trouble for a no-hit :) */
1488                 IP_VS_DBG_PKT(12, af, pp, skb, iph->off,
1489                               "ip_vs_in: packet continues traversal as normal");
1490
1491                 /* Fragment couldn't be mapped to a conn entry */
1492                 if (iph->fragoffs)
1493                         IP_VS_DBG_PKT(7, af, pp, skb, iph->off,
1494                                       "unhandled fragment");
1495
1496                 *verdict = NF_ACCEPT;
1497                 return 0;
1498         }
1499
1500         return 1;
1501 }
1502
1503 /* Check the UDP tunnel and return its header length */
1504 static int ipvs_udp_decap(struct netns_ipvs *ipvs, struct sk_buff *skb,
1505                           unsigned int offset, __u16 af,
1506                           const union nf_inet_addr *daddr, __u8 *proto)
1507 {
1508         struct udphdr _udph, *udph;
1509         struct ip_vs_dest *dest;
1510
1511         udph = skb_header_pointer(skb, offset, sizeof(_udph), &_udph);
1512         if (!udph)
1513                 goto unk;
1514         offset += sizeof(struct udphdr);
1515         dest = ip_vs_find_tunnel(ipvs, af, daddr, udph->dest);
1516         if (!dest)
1517                 goto unk;
1518         if (dest->tun_type == IP_VS_CONN_F_TUNNEL_TYPE_GUE) {
1519                 struct guehdr _gueh, *gueh;
1520
1521                 gueh = skb_header_pointer(skb, offset, sizeof(_gueh), &_gueh);
1522                 if (!gueh)
1523                         goto unk;
1524                 if (gueh->control != 0 || gueh->version != 0)
1525                         goto unk;
1526                 /* Later we can support also IPPROTO_IPV6 */
1527                 if (gueh->proto_ctype != IPPROTO_IPIP)
1528                         goto unk;
1529                 *proto = gueh->proto_ctype;
1530                 return sizeof(struct udphdr) + sizeof(struct guehdr) +
1531                        (gueh->hlen << 2);
1532         }
1533
1534 unk:
1535         return 0;
1536 }
1537
1538 /* Check the GRE tunnel and return its header length */
1539 static int ipvs_gre_decap(struct netns_ipvs *ipvs, struct sk_buff *skb,
1540                           unsigned int offset, __u16 af,
1541                           const union nf_inet_addr *daddr, __u8 *proto)
1542 {
1543         struct gre_base_hdr _greh, *greh;
1544         struct ip_vs_dest *dest;
1545
1546         greh = skb_header_pointer(skb, offset, sizeof(_greh), &_greh);
1547         if (!greh)
1548                 goto unk;
1549         dest = ip_vs_find_tunnel(ipvs, af, daddr, 0);
1550         if (!dest)
1551                 goto unk;
1552         if (dest->tun_type == IP_VS_CONN_F_TUNNEL_TYPE_GRE) {
1553                 IP_TUNNEL_DECLARE_FLAGS(flags);
1554                 __be16 type;
1555
1556                 /* Only support version 0 and C (csum) */
1557                 if ((greh->flags & ~GRE_CSUM) != 0)
1558                         goto unk;
1559                 type = greh->protocol;
1560                 /* Later we can support also IPPROTO_IPV6 */
1561                 if (type != htons(ETH_P_IP))
1562                         goto unk;
1563                 *proto = IPPROTO_IPIP;
1564
1565                 gre_flags_to_tnl_flags(flags, greh->flags);
1566
1567                 return gre_calc_hlen(flags);
1568         }
1569
1570 unk:
1571         return 0;
1572 }
1573
1574 /*
1575  *      Handle ICMP messages in the outside-to-inside direction (incoming).
1576  *      Find any that might be relevant, check against existing connections,
1577  *      forward to the right destination host if relevant.
1578  *      Currently handles error types - unreachable, quench, ttl exceeded.
1579  */
1580 static int
1581 ip_vs_in_icmp(struct netns_ipvs *ipvs, struct sk_buff *skb, int *related,
1582               unsigned int hooknum)
1583 {
1584         struct iphdr *iph;
1585         struct icmphdr  _icmph, *ic;
1586         struct iphdr    _ciph, *cih;    /* The ip header contained within the ICMP */
1587         struct ip_vs_iphdr ciph;
1588         struct ip_vs_conn *cp;
1589         struct ip_vs_protocol *pp;
1590         struct ip_vs_proto_data *pd;
1591         unsigned int offset, offset2, ihl, verdict;
1592         bool tunnel, new_cp = false;
1593         union nf_inet_addr *raddr;
1594         char *outer_proto = "IPIP";
1595
1596         *related = 1;
1597
1598         /* reassemble IP fragments */
1599         if (ip_is_fragment(ip_hdr(skb))) {
1600                 if (ip_vs_gather_frags(ipvs, skb, ip_vs_defrag_user(hooknum)))
1601                         return NF_STOLEN;
1602         }
1603
1604         iph = ip_hdr(skb);
1605         offset = ihl = iph->ihl * 4;
1606         ic = skb_header_pointer(skb, offset, sizeof(_icmph), &_icmph);
1607         if (ic == NULL)
1608                 return NF_DROP;
1609
1610         IP_VS_DBG(12, "Incoming ICMP (%d,%d) %pI4->%pI4\n",
1611                   ic->type, ntohs(icmp_id(ic)),
1612                   &iph->saddr, &iph->daddr);
1613
1614         /*
1615          * Work through seeing if this is for us.
1616          * These checks are supposed to be in an order that means easy
1617          * things are checked first to speed up processing.... however
1618          * this means that some packets will manage to get a long way
1619          * down this stack and then be rejected, but that's life.
1620          */
1621         if ((ic->type != ICMP_DEST_UNREACH) &&
1622             (ic->type != ICMP_SOURCE_QUENCH) &&
1623             (ic->type != ICMP_TIME_EXCEEDED)) {
1624                 *related = 0;
1625                 return NF_ACCEPT;
1626         }
1627
1628         /* Now find the contained IP header */
1629         offset += sizeof(_icmph);
1630         cih = skb_header_pointer(skb, offset, sizeof(_ciph), &_ciph);
1631         if (cih == NULL)
1632                 return NF_ACCEPT; /* The packet looks wrong, ignore */
1633         raddr = (union nf_inet_addr *)&cih->daddr;
1634
1635         /* Special case for errors for IPIP/UDP/GRE tunnel packets */
1636         tunnel = false;
1637         if (cih->protocol == IPPROTO_IPIP) {
1638                 struct ip_vs_dest *dest;
1639
1640                 if (unlikely(cih->frag_off & htons(IP_OFFSET)))
1641                         return NF_ACCEPT;
1642                 /* Error for our IPIP must arrive at LOCAL_IN */
1643                 if (!(skb_rtable(skb)->rt_flags & RTCF_LOCAL))
1644                         return NF_ACCEPT;
1645                 dest = ip_vs_find_tunnel(ipvs, AF_INET, raddr, 0);
1646                 /* Only for known tunnel */
1647                 if (!dest || dest->tun_type != IP_VS_CONN_F_TUNNEL_TYPE_IPIP)
1648                         return NF_ACCEPT;
1649                 offset += cih->ihl * 4;
1650                 cih = skb_header_pointer(skb, offset, sizeof(_ciph), &_ciph);
1651                 if (cih == NULL)
1652                         return NF_ACCEPT; /* The packet looks wrong, ignore */
1653                 tunnel = true;
1654         } else if ((cih->protocol == IPPROTO_UDP ||     /* Can be UDP encap */
1655                     cih->protocol == IPPROTO_GRE) &&    /* Can be GRE encap */
1656                    /* Error for our tunnel must arrive at LOCAL_IN */
1657                    (skb_rtable(skb)->rt_flags & RTCF_LOCAL)) {
1658                 __u8 iproto;
1659                 int ulen;
1660
1661                 /* Non-first fragment has no UDP/GRE header */
1662                 if (unlikely(cih->frag_off & htons(IP_OFFSET)))
1663                         return NF_ACCEPT;
1664                 offset2 = offset + cih->ihl * 4;
1665                 if (cih->protocol == IPPROTO_UDP) {
1666                         ulen = ipvs_udp_decap(ipvs, skb, offset2, AF_INET,
1667                                               raddr, &iproto);
1668                         outer_proto = "UDP";
1669                 } else {
1670                         ulen = ipvs_gre_decap(ipvs, skb, offset2, AF_INET,
1671                                               raddr, &iproto);
1672                         outer_proto = "GRE";
1673                 }
1674                 if (ulen > 0) {
1675                         /* Skip IP and UDP/GRE tunnel headers */
1676                         offset = offset2 + ulen;
1677                         /* Now we should be at the original IP header */
1678                         cih = skb_header_pointer(skb, offset, sizeof(_ciph),
1679                                                  &_ciph);
1680                         if (cih && cih->version == 4 && cih->ihl >= 5 &&
1681                             iproto == IPPROTO_IPIP)
1682                                 tunnel = true;
1683                         else
1684                                 return NF_ACCEPT;
1685                 }
1686         }
1687
1688         pd = ip_vs_proto_data_get(ipvs, cih->protocol);
1689         if (!pd)
1690                 return NF_ACCEPT;
1691         pp = pd->pp;
1692
1693         /* Is the embedded protocol header present? */
1694         if (unlikely(cih->frag_off & htons(IP_OFFSET) &&
1695                      pp->dont_defrag))
1696                 return NF_ACCEPT;
1697
1698         IP_VS_DBG_PKT(11, AF_INET, pp, skb, offset,
1699                       "Checking incoming ICMP for");
1700
1701         offset2 = offset;
1702         ip_vs_fill_iph_skb_icmp(AF_INET, skb, offset, !tunnel, &ciph);
1703         offset = ciph.len;
1704
1705         /* The embedded headers contain source and dest in reverse order.
1706          * For IPIP/UDP/GRE tunnel this is error for request, not for reply.
1707          */
1708         cp = INDIRECT_CALL_1(pp->conn_in_get, ip_vs_conn_in_get_proto,
1709                              ipvs, AF_INET, skb, &ciph);
1710
1711         if (!cp) {
1712                 int v;
1713
1714                 if (tunnel || !sysctl_schedule_icmp(ipvs))
1715                         return NF_ACCEPT;
1716
1717                 if (!ip_vs_try_to_schedule(ipvs, AF_INET, skb, pd, &v, &cp, &ciph))
1718                         return v;
1719                 new_cp = true;
1720         }
1721
1722         verdict = NF_DROP;
1723
1724         /* Ensure the checksum is correct */
1725         if (!skb_csum_unnecessary(skb) && ip_vs_checksum_complete(skb, ihl)) {
1726                 /* Failed checksum! */
1727                 IP_VS_DBG(1, "Incoming ICMP: failed checksum from %pI4!\n",
1728                           &iph->saddr);
1729                 goto out;
1730         }
1731
1732         if (tunnel) {
1733                 __be32 info = ic->un.gateway;
1734                 __u8 type = ic->type;
1735                 __u8 code = ic->code;
1736
1737                 /* Update the MTU */
1738                 if (ic->type == ICMP_DEST_UNREACH &&
1739                     ic->code == ICMP_FRAG_NEEDED) {
1740                         struct ip_vs_dest *dest = cp->dest;
1741                         u32 mtu = ntohs(ic->un.frag.mtu);
1742                         __be16 frag_off = cih->frag_off;
1743
1744                         /* Strip outer IP and ICMP, go to IPIP/UDP/GRE header */
1745                         if (pskb_pull(skb, ihl + sizeof(_icmph)) == NULL)
1746                                 goto ignore_tunnel;
1747                         offset2 -= ihl + sizeof(_icmph);
1748                         skb_reset_network_header(skb);
1749                         IP_VS_DBG(12, "ICMP for %s %pI4->%pI4: mtu=%u\n",
1750                                   outer_proto, &ip_hdr(skb)->saddr,
1751                                   &ip_hdr(skb)->daddr, mtu);
1752                         ipv4_update_pmtu(skb, ipvs->net, mtu, 0, 0);
1753                         /* Client uses PMTUD? */
1754                         if (!(frag_off & htons(IP_DF)))
1755                                 goto ignore_tunnel;
1756                         /* Prefer the resulting PMTU */
1757                         if (dest) {
1758                                 struct ip_vs_dest_dst *dest_dst;
1759
1760                                 dest_dst = rcu_dereference(dest->dest_dst);
1761                                 if (dest_dst)
1762                                         mtu = dst_mtu(dest_dst->dst_cache);
1763                         }
1764                         if (mtu > 68 + sizeof(struct iphdr))
1765                                 mtu -= sizeof(struct iphdr);
1766                         info = htonl(mtu);
1767                 }
1768                 /* Strip outer IP, ICMP and IPIP/UDP/GRE, go to IP header of
1769                  * original request.
1770                  */
1771                 if (pskb_pull(skb, offset2) == NULL)
1772                         goto ignore_tunnel;
1773                 skb_reset_network_header(skb);
1774                 IP_VS_DBG(12, "Sending ICMP for %pI4->%pI4: t=%u, c=%u, i=%u\n",
1775                         &ip_hdr(skb)->saddr, &ip_hdr(skb)->daddr,
1776                         type, code, ntohl(info));
1777                 icmp_send(skb, type, code, info);
1778                 /* ICMP can be shorter but anyways, account it */
1779                 ip_vs_out_stats(cp, skb);
1780
1781 ignore_tunnel:
1782                 consume_skb(skb);
1783                 verdict = NF_STOLEN;
1784                 goto out;
1785         }
1786
1787         /* do the statistics and put it back */
1788         ip_vs_in_stats(cp, skb);
1789         if (IPPROTO_TCP == cih->protocol || IPPROTO_UDP == cih->protocol ||
1790             IPPROTO_SCTP == cih->protocol)
1791                 offset += 2 * sizeof(__u16);
1792         verdict = ip_vs_icmp_xmit(skb, cp, pp, offset, hooknum, &ciph);
1793
1794 out:
1795         if (likely(!new_cp))
1796                 __ip_vs_conn_put(cp);
1797         else
1798                 ip_vs_conn_put(cp);
1799
1800         return verdict;
1801 }
1802
1803 #ifdef CONFIG_IP_VS_IPV6
1804 static int ip_vs_in_icmp_v6(struct netns_ipvs *ipvs, struct sk_buff *skb,
1805                             int *related, unsigned int hooknum,
1806                             struct ip_vs_iphdr *iph)
1807 {
1808         struct icmp6hdr _icmph, *ic;
1809         struct ip_vs_iphdr ciph = {.flags = 0, .fragoffs = 0};/*Contained IP */
1810         struct ip_vs_conn *cp;
1811         struct ip_vs_protocol *pp;
1812         struct ip_vs_proto_data *pd;
1813         unsigned int offset, verdict;
1814         bool new_cp = false;
1815
1816         *related = 1;
1817
1818         ic = frag_safe_skb_hp(skb, iph->len, sizeof(_icmph), &_icmph);
1819         if (ic == NULL)
1820                 return NF_DROP;
1821
1822         /*
1823          * Work through seeing if this is for us.
1824          * These checks are supposed to be in an order that means easy
1825          * things are checked first to speed up processing.... however
1826          * this means that some packets will manage to get a long way
1827          * down this stack and then be rejected, but that's life.
1828          */
1829         if (ic->icmp6_type & ICMPV6_INFOMSG_MASK) {
1830                 *related = 0;
1831                 return NF_ACCEPT;
1832         }
1833         /* Fragment header that is before ICMP header tells us that:
1834          * it's not an error message since they can't be fragmented.
1835          */
1836         if (iph->flags & IP6_FH_F_FRAG)
1837                 return NF_DROP;
1838
1839         IP_VS_DBG(8, "Incoming ICMPv6 (%d,%d) %pI6c->%pI6c\n",
1840                   ic->icmp6_type, ntohs(icmpv6_id(ic)),
1841                   &iph->saddr, &iph->daddr);
1842
1843         offset = iph->len + sizeof(_icmph);
1844         if (!ip_vs_fill_iph_skb_icmp(AF_INET6, skb, offset, true, &ciph))
1845                 return NF_ACCEPT;
1846
1847         pd = ip_vs_proto_data_get(ipvs, ciph.protocol);
1848         if (!pd)
1849                 return NF_ACCEPT;
1850         pp = pd->pp;
1851
1852         /* Cannot handle fragmented embedded protocol */
1853         if (ciph.fragoffs)
1854                 return NF_ACCEPT;
1855
1856         IP_VS_DBG_PKT(11, AF_INET6, pp, skb, offset,
1857                       "Checking incoming ICMPv6 for");
1858
1859         /* The embedded headers contain source and dest in reverse order
1860          * if not from localhost
1861          */
1862         cp = INDIRECT_CALL_1(pp->conn_in_get, ip_vs_conn_in_get_proto,
1863                              ipvs, AF_INET6, skb, &ciph);
1864
1865         if (!cp) {
1866                 int v;
1867
1868                 if (!sysctl_schedule_icmp(ipvs))
1869                         return NF_ACCEPT;
1870
1871                 if (!ip_vs_try_to_schedule(ipvs, AF_INET6, skb, pd, &v, &cp, &ciph))
1872                         return v;
1873
1874                 new_cp = true;
1875         }
1876
1877         /* VS/TUN, VS/DR and LOCALNODE just let it go */
1878         if ((hooknum == NF_INET_LOCAL_OUT) &&
1879             (IP_VS_FWD_METHOD(cp) != IP_VS_CONN_F_MASQ)) {
1880                 verdict = NF_ACCEPT;
1881                 goto out;
1882         }
1883
1884         /* do the statistics and put it back */
1885         ip_vs_in_stats(cp, skb);
1886
1887         /* Need to mangle contained IPv6 header in ICMPv6 packet */
1888         offset = ciph.len;
1889         if (IPPROTO_TCP == ciph.protocol || IPPROTO_UDP == ciph.protocol ||
1890             IPPROTO_SCTP == ciph.protocol)
1891                 offset += 2 * sizeof(__u16); /* Also mangle ports */
1892
1893         verdict = ip_vs_icmp_xmit_v6(skb, cp, pp, offset, hooknum, &ciph);
1894
1895 out:
1896         if (likely(!new_cp))
1897                 __ip_vs_conn_put(cp);
1898         else
1899                 ip_vs_conn_put(cp);
1900
1901         return verdict;
1902 }
1903 #endif
1904
1905
1906 /*
1907  *      Check if it's for virtual services, look it up,
1908  *      and send it on its way...
1909  */
1910 static unsigned int
1911 ip_vs_in_hook(void *priv, struct sk_buff *skb, const struct nf_hook_state *state)
1912 {
1913         struct netns_ipvs *ipvs = net_ipvs(state->net);
1914         unsigned int hooknum = state->hook;
1915         struct ip_vs_iphdr iph;
1916         struct ip_vs_protocol *pp;
1917         struct ip_vs_proto_data *pd;
1918         struct ip_vs_conn *cp;
1919         int ret, pkts;
1920         struct sock *sk;
1921         int af = state->pf;
1922
1923         /* Already marked as IPVS request or reply? */
1924         if (skb->ipvs_property)
1925                 return NF_ACCEPT;
1926
1927         /*
1928          *      Big tappo:
1929          *      - remote client: only PACKET_HOST
1930          *      - route: used for struct net when skb->dev is unset
1931          */
1932         if (unlikely((skb->pkt_type != PACKET_HOST &&
1933                       hooknum != NF_INET_LOCAL_OUT) ||
1934                      !skb_dst(skb))) {
1935                 ip_vs_fill_iph_skb(af, skb, false, &iph);
1936                 IP_VS_DBG_BUF(12, "packet type=%d proto=%d daddr=%s"
1937                               " ignored in hook %u\n",
1938                               skb->pkt_type, iph.protocol,
1939                               IP_VS_DBG_ADDR(af, &iph.daddr), hooknum);
1940                 return NF_ACCEPT;
1941         }
1942         /* ipvs enabled in this netns ? */
1943         if (unlikely(sysctl_backup_only(ipvs) || !ipvs->enable))
1944                 return NF_ACCEPT;
1945
1946         ip_vs_fill_iph_skb(af, skb, false, &iph);
1947
1948         /* Bad... Do not break raw sockets */
1949         sk = skb_to_full_sk(skb);
1950         if (unlikely(sk && hooknum == NF_INET_LOCAL_OUT &&
1951                      af == AF_INET)) {
1952
1953                 if (sk->sk_family == PF_INET && inet_test_bit(NODEFRAG, sk))
1954                         return NF_ACCEPT;
1955         }
1956
1957 #ifdef CONFIG_IP_VS_IPV6
1958         if (af == AF_INET6) {
1959                 if (unlikely(iph.protocol == IPPROTO_ICMPV6)) {
1960                         int related;
1961                         int verdict = ip_vs_in_icmp_v6(ipvs, skb, &related,
1962                                                        hooknum, &iph);
1963
1964                         if (related)
1965                                 return verdict;
1966                 }
1967         } else
1968 #endif
1969                 if (unlikely(iph.protocol == IPPROTO_ICMP)) {
1970                         int related;
1971                         int verdict = ip_vs_in_icmp(ipvs, skb, &related,
1972                                                     hooknum);
1973
1974                         if (related)
1975                                 return verdict;
1976                 }
1977
1978         /* Protocol supported? */
1979         pd = ip_vs_proto_data_get(ipvs, iph.protocol);
1980         if (unlikely(!pd)) {
1981                 /* The only way we'll see this packet again is if it's
1982                  * encapsulated, so mark it with ipvs_property=1 so we
1983                  * skip it if we're ignoring tunneled packets
1984                  */
1985                 if (sysctl_ignore_tunneled(ipvs))
1986                         skb->ipvs_property = 1;
1987
1988                 return NF_ACCEPT;
1989         }
1990         pp = pd->pp;
1991         /*
1992          * Check if the packet belongs to an existing connection entry
1993          */
1994         cp = INDIRECT_CALL_1(pp->conn_in_get, ip_vs_conn_in_get_proto,
1995                              ipvs, af, skb, &iph);
1996
1997         if (!iph.fragoffs && is_new_conn(skb, &iph) && cp) {
1998                 int conn_reuse_mode = sysctl_conn_reuse_mode(ipvs);
1999                 bool old_ct = false, resched = false;
2000
2001                 if (unlikely(sysctl_expire_nodest_conn(ipvs)) && cp->dest &&
2002                     unlikely(!atomic_read(&cp->dest->weight))) {
2003                         resched = true;
2004                         old_ct = ip_vs_conn_uses_old_conntrack(cp, skb);
2005                 } else if (conn_reuse_mode &&
2006                            is_new_conn_expected(cp, conn_reuse_mode)) {
2007                         old_ct = ip_vs_conn_uses_old_conntrack(cp, skb);
2008                         if (!atomic_read(&cp->n_control)) {
2009                                 resched = true;
2010                         } else {
2011                                 /* Do not reschedule controlling connection
2012                                  * that uses conntrack while it is still
2013                                  * referenced by controlled connection(s).
2014                                  */
2015                                 resched = !old_ct;
2016                         }
2017                 }
2018
2019                 if (resched) {
2020                         if (!old_ct)
2021                                 cp->flags &= ~IP_VS_CONN_F_NFCT;
2022                         if (!atomic_read(&cp->n_control))
2023                                 ip_vs_conn_expire_now(cp);
2024                         __ip_vs_conn_put(cp);
2025                         if (old_ct)
2026                                 return NF_DROP;
2027                         cp = NULL;
2028                 }
2029         }
2030
2031         /* Check the server status */
2032         if (cp && cp->dest && !(cp->dest->flags & IP_VS_DEST_F_AVAILABLE)) {
2033                 /* the destination server is not available */
2034                 if (sysctl_expire_nodest_conn(ipvs)) {
2035                         bool old_ct = ip_vs_conn_uses_old_conntrack(cp, skb);
2036
2037                         if (!old_ct)
2038                                 cp->flags &= ~IP_VS_CONN_F_NFCT;
2039
2040                         ip_vs_conn_expire_now(cp);
2041                         __ip_vs_conn_put(cp);
2042                         if (old_ct)
2043                                 return NF_DROP;
2044                         cp = NULL;
2045                 } else {
2046                         __ip_vs_conn_put(cp);
2047                         return NF_DROP;
2048                 }
2049         }
2050
2051         if (unlikely(!cp)) {
2052                 int v;
2053
2054                 if (!ip_vs_try_to_schedule(ipvs, af, skb, pd, &v, &cp, &iph))
2055                         return v;
2056         }
2057
2058         IP_VS_DBG_PKT(11, af, pp, skb, iph.off, "Incoming packet");
2059
2060         ip_vs_in_stats(cp, skb);
2061         ip_vs_set_state(cp, IP_VS_DIR_INPUT, skb, pd);
2062         if (cp->packet_xmit)
2063                 ret = cp->packet_xmit(skb, cp, pp, &iph);
2064                 /* do not touch skb anymore */
2065         else {
2066                 IP_VS_DBG_RL("warning: packet_xmit is null");
2067                 ret = NF_ACCEPT;
2068         }
2069
2070         /* Increase its packet counter and check if it is needed
2071          * to be synchronized
2072          *
2073          * Sync connection if it is about to close to
2074          * encorage the standby servers to update the connections timeout
2075          *
2076          * For ONE_PKT let ip_vs_sync_conn() do the filter work.
2077          */
2078
2079         if (cp->flags & IP_VS_CONN_F_ONE_PACKET)
2080                 pkts = sysctl_sync_threshold(ipvs);
2081         else
2082                 pkts = atomic_inc_return(&cp->in_pkts);
2083
2084         if (ipvs->sync_state & IP_VS_STATE_MASTER)
2085                 ip_vs_sync_conn(ipvs, cp, pkts);
2086         else if ((cp->flags & IP_VS_CONN_F_ONE_PACKET) && cp->control)
2087                 /* increment is done inside ip_vs_sync_conn too */
2088                 atomic_inc(&cp->control->in_pkts);
2089
2090         ip_vs_conn_put(cp);
2091         return ret;
2092 }
2093
2094 /*
2095  *      It is hooked at the NF_INET_FORWARD chain, in order to catch ICMP
2096  *      related packets destined for 0.0.0.0/0.
2097  *      When fwmark-based virtual service is used, such as transparent
2098  *      cache cluster, TCP packets can be marked and routed to ip_vs_in,
2099  *      but ICMP destined for 0.0.0.0/0 cannot not be easily marked and
2100  *      sent to ip_vs_in_icmp. So, catch them at the NF_INET_FORWARD chain
2101  *      and send them to ip_vs_in_icmp.
2102  */
2103 static unsigned int
2104 ip_vs_forward_icmp(void *priv, struct sk_buff *skb,
2105                    const struct nf_hook_state *state)
2106 {
2107         struct netns_ipvs *ipvs = net_ipvs(state->net);
2108         int r;
2109
2110         /* ipvs enabled in this netns ? */
2111         if (unlikely(sysctl_backup_only(ipvs) || !ipvs->enable))
2112                 return NF_ACCEPT;
2113
2114         if (state->pf == NFPROTO_IPV4) {
2115                 if (ip_hdr(skb)->protocol != IPPROTO_ICMP)
2116                         return NF_ACCEPT;
2117 #ifdef CONFIG_IP_VS_IPV6
2118         } else {
2119                 struct ip_vs_iphdr iphdr;
2120
2121                 ip_vs_fill_iph_skb(AF_INET6, skb, false, &iphdr);
2122
2123                 if (iphdr.protocol != IPPROTO_ICMPV6)
2124                         return NF_ACCEPT;
2125
2126                 return ip_vs_in_icmp_v6(ipvs, skb, &r, state->hook, &iphdr);
2127 #endif
2128         }
2129
2130         return ip_vs_in_icmp(ipvs, skb, &r, state->hook);
2131 }
2132
2133 static const struct nf_hook_ops ip_vs_ops4[] = {
2134         /* After packet filtering, change source only for VS/NAT */
2135         {
2136                 .hook           = ip_vs_out_hook,
2137                 .pf             = NFPROTO_IPV4,
2138                 .hooknum        = NF_INET_LOCAL_IN,
2139                 .priority       = NF_IP_PRI_NAT_SRC - 2,
2140         },
2141         /* After packet filtering, forward packet through VS/DR, VS/TUN,
2142          * or VS/NAT(change destination), so that filtering rules can be
2143          * applied to IPVS. */
2144         {
2145                 .hook           = ip_vs_in_hook,
2146                 .pf             = NFPROTO_IPV4,
2147                 .hooknum        = NF_INET_LOCAL_IN,
2148                 .priority       = NF_IP_PRI_NAT_SRC - 1,
2149         },
2150         /* Before ip_vs_in, change source only for VS/NAT */
2151         {
2152                 .hook           = ip_vs_out_hook,
2153                 .pf             = NFPROTO_IPV4,
2154                 .hooknum        = NF_INET_LOCAL_OUT,
2155                 .priority       = NF_IP_PRI_NAT_DST + 1,
2156         },
2157         /* After mangle, schedule and forward local requests */
2158         {
2159                 .hook           = ip_vs_in_hook,
2160                 .pf             = NFPROTO_IPV4,
2161                 .hooknum        = NF_INET_LOCAL_OUT,
2162                 .priority       = NF_IP_PRI_NAT_DST + 2,
2163         },
2164         /* After packet filtering (but before ip_vs_out_icmp), catch icmp
2165          * destined for 0.0.0.0/0, which is for incoming IPVS connections */
2166         {
2167                 .hook           = ip_vs_forward_icmp,
2168                 .pf             = NFPROTO_IPV4,
2169                 .hooknum        = NF_INET_FORWARD,
2170                 .priority       = 99,
2171         },
2172         /* After packet filtering, change source only for VS/NAT */
2173         {
2174                 .hook           = ip_vs_out_hook,
2175                 .pf             = NFPROTO_IPV4,
2176                 .hooknum        = NF_INET_FORWARD,
2177                 .priority       = 100,
2178         },
2179 };
2180
2181 #ifdef CONFIG_IP_VS_IPV6
2182 static const struct nf_hook_ops ip_vs_ops6[] = {
2183         /* After packet filtering, change source only for VS/NAT */
2184         {
2185                 .hook           = ip_vs_out_hook,
2186                 .pf             = NFPROTO_IPV6,
2187                 .hooknum        = NF_INET_LOCAL_IN,
2188                 .priority       = NF_IP6_PRI_NAT_SRC - 2,
2189         },
2190         /* After packet filtering, forward packet through VS/DR, VS/TUN,
2191          * or VS/NAT(change destination), so that filtering rules can be
2192          * applied to IPVS. */
2193         {
2194                 .hook           = ip_vs_in_hook,
2195                 .pf             = NFPROTO_IPV6,
2196                 .hooknum        = NF_INET_LOCAL_IN,
2197                 .priority       = NF_IP6_PRI_NAT_SRC - 1,
2198         },
2199         /* Before ip_vs_in, change source only for VS/NAT */
2200         {
2201                 .hook           = ip_vs_out_hook,
2202                 .pf             = NFPROTO_IPV6,
2203                 .hooknum        = NF_INET_LOCAL_OUT,
2204                 .priority       = NF_IP6_PRI_NAT_DST + 1,
2205         },
2206         /* After mangle, schedule and forward local requests */
2207         {
2208                 .hook           = ip_vs_in_hook,
2209                 .pf             = NFPROTO_IPV6,
2210                 .hooknum        = NF_INET_LOCAL_OUT,
2211                 .priority       = NF_IP6_PRI_NAT_DST + 2,
2212         },
2213         /* After packet filtering (but before ip_vs_out_icmp), catch icmp
2214          * destined for 0.0.0.0/0, which is for incoming IPVS connections */
2215         {
2216                 .hook           = ip_vs_forward_icmp,
2217                 .pf             = NFPROTO_IPV6,
2218                 .hooknum        = NF_INET_FORWARD,
2219                 .priority       = 99,
2220         },
2221         /* After packet filtering, change source only for VS/NAT */
2222         {
2223                 .hook           = ip_vs_out_hook,
2224                 .pf             = NFPROTO_IPV6,
2225                 .hooknum        = NF_INET_FORWARD,
2226                 .priority       = 100,
2227         },
2228 };
2229 #endif
2230
2231 int ip_vs_register_hooks(struct netns_ipvs *ipvs, unsigned int af)
2232 {
2233         const struct nf_hook_ops *ops;
2234         unsigned int count;
2235         unsigned int afmask;
2236         int ret = 0;
2237
2238         if (af == AF_INET6) {
2239 #ifdef CONFIG_IP_VS_IPV6
2240                 ops = ip_vs_ops6;
2241                 count = ARRAY_SIZE(ip_vs_ops6);
2242                 afmask = 2;
2243 #else
2244                 return -EINVAL;
2245 #endif
2246         } else {
2247                 ops = ip_vs_ops4;
2248                 count = ARRAY_SIZE(ip_vs_ops4);
2249                 afmask = 1;
2250         }
2251
2252         if (!(ipvs->hooks_afmask & afmask)) {
2253                 ret = nf_register_net_hooks(ipvs->net, ops, count);
2254                 if (ret >= 0)
2255                         ipvs->hooks_afmask |= afmask;
2256         }
2257         return ret;
2258 }
2259
2260 void ip_vs_unregister_hooks(struct netns_ipvs *ipvs, unsigned int af)
2261 {
2262         const struct nf_hook_ops *ops;
2263         unsigned int count;
2264         unsigned int afmask;
2265
2266         if (af == AF_INET6) {
2267 #ifdef CONFIG_IP_VS_IPV6
2268                 ops = ip_vs_ops6;
2269                 count = ARRAY_SIZE(ip_vs_ops6);
2270                 afmask = 2;
2271 #else
2272                 return;
2273 #endif
2274         } else {
2275                 ops = ip_vs_ops4;
2276                 count = ARRAY_SIZE(ip_vs_ops4);
2277                 afmask = 1;
2278         }
2279
2280         if (ipvs->hooks_afmask & afmask) {
2281                 nf_unregister_net_hooks(ipvs->net, ops, count);
2282                 ipvs->hooks_afmask &= ~afmask;
2283         }
2284 }
2285
2286 /*
2287  *      Initialize IP Virtual Server netns mem.
2288  */
2289 static int __net_init __ip_vs_init(struct net *net)
2290 {
2291         struct netns_ipvs *ipvs;
2292
2293         ipvs = net_generic(net, ip_vs_net_id);
2294         if (ipvs == NULL)
2295                 return -ENOMEM;
2296
2297         /* Hold the beast until a service is registered */
2298         ipvs->enable = 0;
2299         ipvs->net = net;
2300         /* Counters used for creating unique names */
2301         ipvs->gen = atomic_read(&ipvs_netns_cnt);
2302         atomic_inc(&ipvs_netns_cnt);
2303         net->ipvs = ipvs;
2304
2305         if (ip_vs_estimator_net_init(ipvs) < 0)
2306                 goto estimator_fail;
2307
2308         if (ip_vs_control_net_init(ipvs) < 0)
2309                 goto control_fail;
2310
2311         if (ip_vs_protocol_net_init(ipvs) < 0)
2312                 goto protocol_fail;
2313
2314         if (ip_vs_app_net_init(ipvs) < 0)
2315                 goto app_fail;
2316
2317         if (ip_vs_conn_net_init(ipvs) < 0)
2318                 goto conn_fail;
2319
2320         if (ip_vs_sync_net_init(ipvs) < 0)
2321                 goto sync_fail;
2322
2323         return 0;
2324 /*
2325  * Error handling
2326  */
2327
2328 sync_fail:
2329         ip_vs_conn_net_cleanup(ipvs);
2330 conn_fail:
2331         ip_vs_app_net_cleanup(ipvs);
2332 app_fail:
2333         ip_vs_protocol_net_cleanup(ipvs);
2334 protocol_fail:
2335         ip_vs_control_net_cleanup(ipvs);
2336 control_fail:
2337         ip_vs_estimator_net_cleanup(ipvs);
2338 estimator_fail:
2339         net->ipvs = NULL;
2340         return -ENOMEM;
2341 }
2342
2343 static void __net_exit __ip_vs_cleanup_batch(struct list_head *net_list)
2344 {
2345         struct netns_ipvs *ipvs;
2346         struct net *net;
2347
2348         ip_vs_service_nets_cleanup(net_list);   /* ip_vs_flush() with locks */
2349         list_for_each_entry(net, net_list, exit_list) {
2350                 ipvs = net_ipvs(net);
2351                 ip_vs_conn_net_cleanup(ipvs);
2352                 ip_vs_app_net_cleanup(ipvs);
2353                 ip_vs_protocol_net_cleanup(ipvs);
2354                 ip_vs_control_net_cleanup(ipvs);
2355                 ip_vs_estimator_net_cleanup(ipvs);
2356                 IP_VS_DBG(2, "ipvs netns %d released\n", ipvs->gen);
2357                 net->ipvs = NULL;
2358         }
2359 }
2360
2361 static void __net_exit __ip_vs_dev_cleanup_batch(struct list_head *net_list)
2362 {
2363         struct netns_ipvs *ipvs;
2364         struct net *net;
2365
2366         list_for_each_entry(net, net_list, exit_list) {
2367                 ipvs = net_ipvs(net);
2368                 ip_vs_unregister_hooks(ipvs, AF_INET);
2369                 ip_vs_unregister_hooks(ipvs, AF_INET6);
2370                 ipvs->enable = 0;       /* Disable packet reception */
2371                 smp_wmb();
2372                 ip_vs_sync_net_cleanup(ipvs);
2373         }
2374 }
2375
2376 static struct pernet_operations ipvs_core_ops = {
2377         .init = __ip_vs_init,
2378         .exit_batch = __ip_vs_cleanup_batch,
2379         .id   = &ip_vs_net_id,
2380         .size = sizeof(struct netns_ipvs),
2381 };
2382
2383 static struct pernet_operations ipvs_core_dev_ops = {
2384         .exit_batch = __ip_vs_dev_cleanup_batch,
2385 };
2386
2387 /*
2388  *      Initialize IP Virtual Server
2389  */
2390 static int __init ip_vs_init(void)
2391 {
2392         int ret;
2393
2394         ret = ip_vs_control_init();
2395         if (ret < 0) {
2396                 pr_err("can't setup control.\n");
2397                 goto exit;
2398         }
2399
2400         ip_vs_protocol_init();
2401
2402         ret = ip_vs_conn_init();
2403         if (ret < 0) {
2404                 pr_err("can't setup connection table.\n");
2405                 goto cleanup_protocol;
2406         }
2407
2408         ret = register_pernet_subsys(&ipvs_core_ops);   /* Alloc ip_vs struct */
2409         if (ret < 0)
2410                 goto cleanup_conn;
2411
2412         ret = register_pernet_device(&ipvs_core_dev_ops);
2413         if (ret < 0)
2414                 goto cleanup_sub;
2415
2416         ret = ip_vs_register_nl_ioctl();
2417         if (ret < 0) {
2418                 pr_err("can't register netlink/ioctl.\n");
2419                 goto cleanup_dev;
2420         }
2421
2422         pr_info("ipvs loaded.\n");
2423
2424         return ret;
2425
2426 cleanup_dev:
2427         unregister_pernet_device(&ipvs_core_dev_ops);
2428 cleanup_sub:
2429         unregister_pernet_subsys(&ipvs_core_ops);
2430 cleanup_conn:
2431         ip_vs_conn_cleanup();
2432 cleanup_protocol:
2433         ip_vs_protocol_cleanup();
2434         ip_vs_control_cleanup();
2435 exit:
2436         return ret;
2437 }
2438
2439 static void __exit ip_vs_cleanup(void)
2440 {
2441         ip_vs_unregister_nl_ioctl();
2442         unregister_pernet_device(&ipvs_core_dev_ops);
2443         unregister_pernet_subsys(&ipvs_core_ops);       /* free ip_vs struct */
2444         ip_vs_conn_cleanup();
2445         ip_vs_protocol_cleanup();
2446         ip_vs_control_cleanup();
2447         /* common rcu_barrier() used by:
2448          * - ip_vs_control_cleanup()
2449          */
2450         rcu_barrier();
2451         pr_info("ipvs unloaded.\n");
2452 }
2453
2454 module_init(ip_vs_init);
2455 module_exit(ip_vs_cleanup);
2456 MODULE_LICENSE("GPL");
2457 MODULE_DESCRIPTION("IP Virtual Server");