net/netfilter/xt_TPROXY.c

   1 /*
   2  * Transparent proxy support for Linux/iptables
   3  *
   4  * Copyright (c) 2006-2010 BalaBit IT Ltd.
   5  * Author: Balazs Scheidler, Krisztian Kovacs
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  *
  11  */
  12 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  13 #include <linux/module.h>
  14 #include <linux/skbuff.h>
  15 #include <linux/ip.h>
  16 #include <net/checksum.h>
  17 #include <net/udp.h>
  18 #include <net/tcp.h>
  19 #include <net/inet_sock.h>
  20 #include <net/inet_hashtables.h>
  21 #include <linux/inetdevice.h>
  22 #include <linux/netfilter/x_tables.h>
  23 #include <linux/netfilter_ipv4/ip_tables.h>
  24
  25 #include <net/netfilter/ipv4/nf_defrag_ipv4.h>
  26
  27 #if IS_ENABLED(CONFIG_IP6_NF_IPTABLES)
  28 #define XT_TPROXY_HAVE_IPV6 1
  29 #include <net/if_inet6.h>
  30 #include <net/addrconf.h>
  31 #include <net/inet6_hashtables.h>
  32 #include <linux/netfilter_ipv6/ip6_tables.h>
  33 #include <net/netfilter/ipv6/nf_defrag_ipv6.h>
  34 #endif
  35
  36 #include <linux/netfilter/xt_TPROXY.h>
  37
  38 enum nf_tproxy_lookup_t {
  39          NFT_LOOKUP_LISTENER,
  40          NFT_LOOKUP_ESTABLISHED,
  41 };
  42
  43 static bool tproxy_sk_is_transparent(struct sock *sk)
  44 {
  45         switch (sk->sk_state) {
  46         case TCP_TIME_WAIT:
  47                 if (inet_twsk(sk)->tw_transparent)
  48                         return true;
  49                 break;
  50         case TCP_NEW_SYN_RECV:
  51                 if (inet_rsk(inet_reqsk(sk))->no_srccheck)
  52                         return true;
  53                 break;
  54         default:
  55                 if (inet_sk(sk)->transparent)
  56                         return true;
  57         }
  58
  59         sock_gen_put(sk);
  60         return false;
  61 }
  62
  63 static inline __be32
  64 tproxy_laddr4(struct sk_buff *skb, __be32 user_laddr, __be32 daddr)
  65 {
  66         struct in_device *indev;
  67         __be32 laddr;
  68
  69         if (user_laddr)
  70                 return user_laddr;
  71
  72         laddr = 0;
  73         indev = __in_dev_get_rcu(skb->dev);
  74         for_primary_ifa(indev) {
  75                 laddr = ifa->ifa_local;
  76                 break;
  77         } endfor_ifa(indev);
  78
  79         return laddr ? laddr : daddr;
  80 }
  81
  82 /*
  83  * This is used when the user wants to intercept a connection matching
  84  * an explicit iptables rule. In this case the sockets are assumed
  85  * matching in preference order:
  86  *
  87  *   - match: if there's a fully established connection matching the
  88  *     _packet_ tuple, it is returned, assuming the redirection
  89  *     already took place and we process a packet belonging to an
  90  *     established connection
  91  *
  92  *   - match: if there's a listening socket matching the redirection
  93  *     (e.g. on-port & on-ip of the connection), it is returned,
  94  *     regardless if it was bound to 0.0.0.0 or an explicit
  95  *     address. The reasoning is that if there's an explicit rule, it
  96  *     does not really matter if the listener is bound to an interface
  97  *     or to 0. The user already stated that he wants redirection
  98  *     (since he added the rule).
  99  *
 100  * Please note that there's an overlap between what a TPROXY target
 101  * and a socket match will match. Normally if you have both rules the
 102  * "socket" match will be the first one, effectively all packets
 103  * belonging to established connections going through that one.
 104  */
 105 static inline struct sock *
 106 nf_tproxy_get_sock_v4(struct net *net, struct sk_buff *skb, void *hp,
 107                       const u8 protocol,
 108                       const __be32 saddr, const __be32 daddr,
 109                       const __be16 sport, const __be16 dport,
 110                       const struct net_device *in,
 111                       const enum nf_tproxy_lookup_t lookup_type)
 112 {
 113         struct sock *sk;
 114         struct tcphdr *tcph;
 115
 116         switch (protocol) {
 117         case IPPROTO_TCP:
 118                 switch (lookup_type) {
 119                 case NFT_LOOKUP_LISTENER:
 120                         tcph = hp;
 121                         sk = inet_lookup_listener(net, &tcp_hashinfo, skb,
 122                                                     ip_hdrlen(skb) +
 123                                                       __tcp_hdrlen(tcph),
 124                                                     saddr, sport,
 125                                                     daddr, dport,
 126                                                     in->ifindex, 0);
 127
 128                         if (sk && !refcount_inc_not_zero(&sk->sk_refcnt))
 129                                 sk = NULL;
 130                         /* NOTE: we return listeners even if bound to
 131                          * 0.0.0.0, those are filtered out in
 132                          * xt_socket, since xt_TPROXY needs 0 bound
 133                          * listeners too
 134                          */
 135                         break;
 136                 case NFT_LOOKUP_ESTABLISHED:
 137                         sk = inet_lookup_established(net, &tcp_hashinfo,
 138                                                     saddr, sport, daddr, dport,
 139                                                     in->ifindex);
 140                         break;
 141                 default:
 142                         BUG();
 143                 }
 144                 break;
 145         case IPPROTO_UDP:
 146                 sk = udp4_lib_lookup(net, saddr, sport, daddr, dport,
 147                                      in->ifindex);
 148                 if (sk) {
 149                         int connected = (sk->sk_state == TCP_ESTABLISHED);
 150                         int wildcard = (inet_sk(sk)->inet_rcv_saddr == 0);
 151
 152                         /* NOTE: we return listeners even if bound to
 153                          * 0.0.0.0, those are filtered out in
 154                          * xt_socket, since xt_TPROXY needs 0 bound
 155                          * listeners too
 156                          */
 157                         if ((lookup_type == NFT_LOOKUP_ESTABLISHED && (!connected || wildcard)) ||
 158                             (lookup_type == NFT_LOOKUP_LISTENER && connected)) {
 159                                 sock_put(sk);
 160                                 sk = NULL;
 161                         }
 162                 }
 163                 break;
 164         default:
 165                 WARN_ON(1);
 166                 sk = NULL;
 167         }
 168
 169         pr_debug("tproxy socket lookup: proto %u %08x:%u -> %08x:%u, lookup type: %d, sock %p\n",
 170                  protocol, ntohl(saddr), ntohs(sport), ntohl(daddr), ntohs(dport), lookup_type, sk);
 171
 172         return sk;
 173 }
 174
 175 #ifdef XT_TPROXY_HAVE_IPV6
 176 static inline struct sock *
 177 nf_tproxy_get_sock_v6(struct net *net, struct sk_buff *skb, int thoff, void *hp,
 178                       const u8 protocol,
 179                       const struct in6_addr *saddr, const struct in6_addr *daddr,
 180                       const __be16 sport, const __be16 dport,
 181                       const struct net_device *in,
 182                       const enum nf_tproxy_lookup_t lookup_type)
 183 {
 184         struct sock *sk;
 185         struct tcphdr *tcph;
 186
 187         switch (protocol) {
 188         case IPPROTO_TCP:
 189                 switch (lookup_type) {
 190                 case NFT_LOOKUP_LISTENER:
 191                         tcph = hp;
 192                         sk = inet6_lookup_listener(net, &tcp_hashinfo, skb,
 193                                                    thoff + __tcp_hdrlen(tcph),
 194                                                    saddr, sport,
 195                                                    daddr, ntohs(dport),
 196                                                    in->ifindex, 0);
 197
 198                         if (sk && !refcount_inc_not_zero(&sk->sk_refcnt))
 199                                 sk = NULL;
 200                         /* NOTE: we return listeners even if bound to
 201                          * 0.0.0.0, those are filtered out in
 202                          * xt_socket, since xt_TPROXY needs 0 bound
 203                          * listeners too
 204                          */
 205                         break;
 206                 case NFT_LOOKUP_ESTABLISHED:
 207                         sk = __inet6_lookup_established(net, &tcp_hashinfo,
 208                                                         saddr, sport, daddr, ntohs(dport),
 209                                                         in->ifindex, 0);
 210                         break;
 211                 default:
 212                         BUG();
 213                 }
 214                 break;
 215         case IPPROTO_UDP:
 216                 sk = udp6_lib_lookup(net, saddr, sport, daddr, dport,
 217                                      in->ifindex);
 218                 if (sk) {
 219                         int connected = (sk->sk_state == TCP_ESTABLISHED);
 220                         int wildcard = ipv6_addr_any(&sk->sk_v6_rcv_saddr);
 221
 222                         /* NOTE: we return listeners even if bound to
 223                          * 0.0.0.0, those are filtered out in
 224                          * xt_socket, since xt_TPROXY needs 0 bound
 225                          * listeners too
 226                          */
 227                         if ((lookup_type == NFT_LOOKUP_ESTABLISHED && (!connected || wildcard)) ||
 228                             (lookup_type == NFT_LOOKUP_LISTENER && connected)) {
 229                                 sock_put(sk);
 230                                 sk = NULL;
 231                         }
 232                 }
 233                 break;
 234         default:
 235                 WARN_ON(1);
 236                 sk = NULL;
 237         }
 238
 239         pr_debug("tproxy socket lookup: proto %u %pI6:%u -> %pI6:%u, lookup type: %d, sock %p\n",
 240                  protocol, saddr, ntohs(sport), daddr, ntohs(dport), lookup_type, sk);
 241
 242         return sk;
 243 }
 244 #endif
 245
 246 /**
 247  * tproxy_handle_time_wait4 - handle IPv4 TCP TIME_WAIT reopen redirections
 248  * @skb:        The skb being processed.
 249  * @laddr:      IPv4 address to redirect to or zero.
 250  * @lport:      TCP port to redirect to or zero.
 251  * @sk:         The TIME_WAIT TCP socket found by the lookup.
 252  *
 253  * We have to handle SYN packets arriving to TIME_WAIT sockets
 254  * differently: instead of reopening the connection we should rather
 255  * redirect the new connection to the proxy if there's a listener
 256  * socket present.
 257  *
 258  * tproxy_handle_time_wait4() consumes the socket reference passed in.
 259  *
 260  * Returns the listener socket if there's one, the TIME_WAIT socket if
 261  * no such listener is found, or NULL if the TCP header is incomplete.
 262  */
 263 static struct sock *
 264 tproxy_handle_time_wait4(struct net *net, struct sk_buff *skb,
 265                          __be32 laddr, __be16 lport, struct sock *sk)
 266 {
 267         const struct iphdr *iph = ip_hdr(skb);
 268         struct tcphdr _hdr, *hp;
 269
 270         hp = skb_header_pointer(skb, ip_hdrlen(skb), sizeof(_hdr), &_hdr);
 271         if (hp == NULL) {
 272                 inet_twsk_put(inet_twsk(sk));
 273                 return NULL;
 274         }
 275
 276         if (hp->syn && !hp->rst && !hp->ack && !hp->fin) {
 277                 /* SYN to a TIME_WAIT socket, we'd rather redirect it
 278                  * to a listener socket if there's one */
 279                 struct sock *sk2;
 280
 281                 sk2 = nf_tproxy_get_sock_v4(net, skb, hp, iph->protocol,
 282                                             iph->saddr, laddr ? laddr : iph->daddr,
 283                                             hp->source, lport ? lport : hp->dest,
 284                                             skb->dev, NFT_LOOKUP_LISTENER);
 285                 if (sk2) {
 286                         inet_twsk_deschedule_put(inet_twsk(sk));
 287                         sk = sk2;
 288                 }
 289         }
 290
 291         return sk;
 292 }
 293
 294 /* assign a socket to the skb -- consumes sk */
 295 static void
 296 nf_tproxy_assign_sock(struct sk_buff *skb, struct sock *sk)
 297 {
 298         skb_orphan(skb);
 299         skb->sk = sk;
 300         skb->destructor = sock_edemux;
 301 }
 302
 303 static unsigned int
 304 tproxy_tg4(struct net *net, struct sk_buff *skb, __be32 laddr, __be16 lport,
 305            u_int32_t mark_mask, u_int32_t mark_value)
 306 {
 307         const struct iphdr *iph = ip_hdr(skb);
 308         struct udphdr _hdr, *hp;
 309         struct sock *sk;
 310
 311         hp = skb_header_pointer(skb, ip_hdrlen(skb), sizeof(_hdr), &_hdr);
 312         if (hp == NULL)
 313                 return NF_DROP;
 314
 315         /* check if there's an ongoing connection on the packet
 316          * addresses, this happens if the redirect already happened
 317          * and the current packet belongs to an already established
 318          * connection */
 319         sk = nf_tproxy_get_sock_v4(net, skb, hp, iph->protocol,
 320                                    iph->saddr, iph->daddr,
 321                                    hp->source, hp->dest,
 322                                    skb->dev, NFT_LOOKUP_ESTABLISHED);
 323
 324         laddr = tproxy_laddr4(skb, laddr, iph->daddr);
 325         if (!lport)
 326                 lport = hp->dest;
 327
 328         /* UDP has no TCP_TIME_WAIT state, so we never enter here */
 329         if (sk && sk->sk_state == TCP_TIME_WAIT)
 330                 /* reopening a TIME_WAIT connection needs special handling */
 331                 sk = tproxy_handle_time_wait4(net, skb, laddr, lport, sk);
 332         else if (!sk)
 333                 /* no, there's no established connection, check if
 334                  * there's a listener on the redirected addr/port */
 335                 sk = nf_tproxy_get_sock_v4(net, skb, hp, iph->protocol,
 336                                            iph->saddr, laddr,
 337                                            hp->source, lport,
 338                                            skb->dev, NFT_LOOKUP_LISTENER);
 339
 340         /* NOTE: assign_sock consumes our sk reference */
 341         if (sk && tproxy_sk_is_transparent(sk)) {
 342                 /* This should be in a separate target, but we don't do multiple
 343                    targets on the same rule yet */
 344                 skb->mark = (skb->mark & ~mark_mask) ^ mark_value;
 345
 346                 pr_debug("redirecting: proto %hhu %pI4:%hu -> %pI4:%hu, mark: %x\n",
 347                          iph->protocol, &iph->daddr, ntohs(hp->dest),
 348                          &laddr, ntohs(lport), skb->mark);
 349
 350                 nf_tproxy_assign_sock(skb, sk);
 351                 return NF_ACCEPT;
 352         }
 353
 354         pr_debug("no socket, dropping: proto %hhu %pI4:%hu -> %pI4:%hu, mark: %x\n",
 355                  iph->protocol, &iph->saddr, ntohs(hp->source),
 356                  &iph->daddr, ntohs(hp->dest), skb->mark);
 357         return NF_DROP;
 358 }
 359
 360 static unsigned int
 361 tproxy_tg4_v0(struct sk_buff *skb, const struct xt_action_param *par)
 362 {
 363         const struct xt_tproxy_target_info *tgi = par->targinfo;
 364
 365         return tproxy_tg4(xt_net(par), skb, tgi->laddr, tgi->lport,
 366                           tgi->mark_mask, tgi->mark_value);
 367 }
 368
 369 static unsigned int
 370 tproxy_tg4_v1(struct sk_buff *skb, const struct xt_action_param *par)
 371 {
 372         const struct xt_tproxy_target_info_v1 *tgi = par->targinfo;
 373
 374         return tproxy_tg4(xt_net(par), skb, tgi->laddr.ip, tgi->lport,
 375                           tgi->mark_mask, tgi->mark_value);
 376 }
 377
 378 #ifdef XT_TPROXY_HAVE_IPV6
 379
 380 static inline const struct in6_addr *
 381 tproxy_laddr6(struct sk_buff *skb, const struct in6_addr *user_laddr,
 382               const struct in6_addr *daddr)
 383 {
 384         struct inet6_dev *indev;
 385         struct inet6_ifaddr *ifa;
 386         struct in6_addr *laddr;
 387
 388         if (!ipv6_addr_any(user_laddr))
 389                 return user_laddr;
 390         laddr = NULL;
 391
 392         indev = __in6_dev_get(skb->dev);
 393         if (indev) {
 394                 read_lock_bh(&indev->lock);
 395                 list_for_each_entry(ifa, &indev->addr_list, if_list) {
 396                         if (ifa->flags & (IFA_F_TENTATIVE | IFA_F_DEPRECATED))
 397                                 continue;
 398
 399                         laddr = &ifa->addr;
 400                         break;
 401                 }
 402                 read_unlock_bh(&indev->lock);
 403         }
 404
 405         return laddr ? laddr : daddr;
 406 }
 407
 408 /**
 409  * tproxy_handle_time_wait6 - handle IPv6 TCP TIME_WAIT reopen redirections
 410  * @skb:        The skb being processed.
 411  * @tproto:     Transport protocol.
 412  * @thoff:      Transport protocol header offset.
 413  * @par:        Iptables target parameters.
 414  * @sk:         The TIME_WAIT TCP socket found by the lookup.
 415  *
 416  * We have to handle SYN packets arriving to TIME_WAIT sockets
 417  * differently: instead of reopening the connection we should rather
 418  * redirect the new connection to the proxy if there's a listener
 419  * socket present.
 420  *
 421  * tproxy_handle_time_wait6() consumes the socket reference passed in.
 422  *
 423  * Returns the listener socket if there's one, the TIME_WAIT socket if
 424  * no such listener is found, or NULL if the TCP header is incomplete.
 425  */
 426 static struct sock *
 427 tproxy_handle_time_wait6(struct sk_buff *skb, int tproto, int thoff,
 428                          const struct xt_action_param *par,
 429                          struct sock *sk)
 430 {
 431         const struct ipv6hdr *iph = ipv6_hdr(skb);
 432         struct tcphdr _hdr, *hp;
 433         const struct xt_tproxy_target_info_v1 *tgi = par->targinfo;
 434
 435         hp = skb_header_pointer(skb, thoff, sizeof(_hdr), &_hdr);
 436         if (hp == NULL) {
 437                 inet_twsk_put(inet_twsk(sk));
 438                 return NULL;
 439         }
 440
 441         if (hp->syn && !hp->rst && !hp->ack && !hp->fin) {
 442                 /* SYN to a TIME_WAIT socket, we'd rather redirect it
 443                  * to a listener socket if there's one */
 444                 struct sock *sk2;
 445
 446                 sk2 = nf_tproxy_get_sock_v6(xt_net(par), skb, thoff, hp, tproto,
 447                                             &iph->saddr,
 448                                             tproxy_laddr6(skb, &tgi->laddr.in6, &iph->daddr),
 449                                             hp->source,
 450                                             tgi->lport ? tgi->lport : hp->dest,
 451                                             skb->dev, NFT_LOOKUP_LISTENER);
 452                 if (sk2) {
 453                         inet_twsk_deschedule_put(inet_twsk(sk));
 454                         sk = sk2;
 455                 }
 456         }
 457
 458         return sk;
 459 }
 460
 461 static unsigned int
 462 tproxy_tg6_v1(struct sk_buff *skb, const struct xt_action_param *par)
 463 {
 464         const struct ipv6hdr *iph = ipv6_hdr(skb);
 465         const struct xt_tproxy_target_info_v1 *tgi = par->targinfo;
 466         struct udphdr _hdr, *hp;
 467         struct sock *sk;
 468         const struct in6_addr *laddr;
 469         __be16 lport;
 470         int thoff = 0;
 471         int tproto;
 472
 473         tproto = ipv6_find_hdr(skb, &thoff, -1, NULL, NULL);
 474         if (tproto < 0) {
 475                 pr_debug("unable to find transport header in IPv6 packet, dropping\n");
 476                 return NF_DROP;
 477         }
 478
 479         hp = skb_header_pointer(skb, thoff, sizeof(_hdr), &_hdr);
 480         if (hp == NULL) {
 481                 pr_debug("unable to grab transport header contents in IPv6 packet, dropping\n");
 482                 return NF_DROP;
 483         }
 484
 485         /* check if there's an ongoing connection on the packet
 486          * addresses, this happens if the redirect already happened
 487          * and the current packet belongs to an already established
 488          * connection */
 489         sk = nf_tproxy_get_sock_v6(xt_net(par), skb, thoff, hp, tproto,
 490                                    &iph->saddr, &iph->daddr,
 491                                    hp->source, hp->dest,
 492                                    xt_in(par), NFT_LOOKUP_ESTABLISHED);
 493
 494         laddr = tproxy_laddr6(skb, &tgi->laddr.in6, &iph->daddr);
 495         lport = tgi->lport ? tgi->lport : hp->dest;
 496
 497         /* UDP has no TCP_TIME_WAIT state, so we never enter here */
 498         if (sk && sk->sk_state == TCP_TIME_WAIT)
 499                 /* reopening a TIME_WAIT connection needs special handling */
 500                 sk = tproxy_handle_time_wait6(skb, tproto, thoff, par, sk);
 501         else if (!sk)
 502                 /* no there's no established connection, check if
 503                  * there's a listener on the redirected addr/port */
 504                 sk = nf_tproxy_get_sock_v6(xt_net(par), skb, thoff, hp,
 505                                            tproto, &iph->saddr, laddr,
 506                                            hp->source, lport,
 507                                            xt_in(par), NFT_LOOKUP_LISTENER);
 508
 509         /* NOTE: assign_sock consumes our sk reference */
 510         if (sk && tproxy_sk_is_transparent(sk)) {
 511                 /* This should be in a separate target, but we don't do multiple
 512                    targets on the same rule yet */
 513                 skb->mark = (skb->mark & ~tgi->mark_mask) ^ tgi->mark_value;
 514
 515                 pr_debug("redirecting: proto %hhu %pI6:%hu -> %pI6:%hu, mark: %x\n",
 516                          tproto, &iph->saddr, ntohs(hp->source),
 517                          laddr, ntohs(lport), skb->mark);
 518
 519                 nf_tproxy_assign_sock(skb, sk);
 520                 return NF_ACCEPT;
 521         }
 522
 523         pr_debug("no socket, dropping: proto %hhu %pI6:%hu -> %pI6:%hu, mark: %x\n",
 524                  tproto, &iph->saddr, ntohs(hp->source),
 525                  &iph->daddr, ntohs(hp->dest), skb->mark);
 526
 527         return NF_DROP;
 528 }
 529
 530 static int tproxy_tg6_check(const struct xt_tgchk_param *par)
 531 {
 532         const struct ip6t_ip6 *i = par->entryinfo;
 533         int err;
 534
 535         err = nf_defrag_ipv6_enable(par->net);
 536         if (err)
 537                 return err;
 538
 539         if ((i->proto == IPPROTO_TCP || i->proto == IPPROTO_UDP) &&
 540             !(i->invflags & IP6T_INV_PROTO))
 541                 return 0;
 542
 543         pr_info_ratelimited("Can be used only with -p tcp or -p udp\n");
 544         return -EINVAL;
 545 }
 546 #endif
 547
 548 static int tproxy_tg4_check(const struct xt_tgchk_param *par)
 549 {
 550         const struct ipt_ip *i = par->entryinfo;
 551         int err;
 552
 553         err = nf_defrag_ipv4_enable(par->net);
 554         if (err)
 555                 return err;
 556
 557         if ((i->proto == IPPROTO_TCP || i->proto == IPPROTO_UDP)
 558             && !(i->invflags & IPT_INV_PROTO))
 559                 return 0;
 560
 561         pr_info_ratelimited("Can be used only with -p tcp or -p udp\n");
 562         return -EINVAL;
 563 }
 564
 565 static struct xt_target tproxy_tg_reg[] __read_mostly = {
 566         {
 567                 .name           = "TPROXY",
 568                 .family         = NFPROTO_IPV4,
 569                 .table          = "mangle",
 570                 .target         = tproxy_tg4_v0,
 571                 .revision       = 0,
 572                 .targetsize     = sizeof(struct xt_tproxy_target_info),
 573                 .checkentry     = tproxy_tg4_check,
 574                 .hooks          = 1 << NF_INET_PRE_ROUTING,
 575                 .me             = THIS_MODULE,
 576         },
 577         {
 578                 .name           = "TPROXY",
 579                 .family         = NFPROTO_IPV4,
 580                 .table          = "mangle",
 581                 .target         = tproxy_tg4_v1,
 582                 .revision       = 1,
 583                 .targetsize     = sizeof(struct xt_tproxy_target_info_v1),
 584                 .checkentry     = tproxy_tg4_check,
 585                 .hooks          = 1 << NF_INET_PRE_ROUTING,
 586                 .me             = THIS_MODULE,
 587         },
 588 #ifdef XT_TPROXY_HAVE_IPV6
 589         {
 590                 .name           = "TPROXY",
 591                 .family         = NFPROTO_IPV6,
 592                 .table          = "mangle",
 593                 .target         = tproxy_tg6_v1,
 594                 .revision       = 1,
 595                 .targetsize     = sizeof(struct xt_tproxy_target_info_v1),
 596                 .checkentry     = tproxy_tg6_check,
 597                 .hooks          = 1 << NF_INET_PRE_ROUTING,
 598                 .me             = THIS_MODULE,
 599         },
 600 #endif
 601
 602 };
 603
 604 static int __init tproxy_tg_init(void)
 605 {
 606         return xt_register_targets(tproxy_tg_reg, ARRAY_SIZE(tproxy_tg_reg));
 607 }
 608
 609 static void __exit tproxy_tg_exit(void)
 610 {
 611         xt_unregister_targets(tproxy_tg_reg, ARRAY_SIZE(tproxy_tg_reg));
 612 }
 613
 614 module_init(tproxy_tg_init);
 615 module_exit(tproxy_tg_exit);
 616 MODULE_LICENSE("GPL");
 617 MODULE_AUTHOR("Balazs Scheidler, Krisztian Kovacs");
 618 MODULE_DESCRIPTION("Netfilter transparent proxy (TPROXY) target module.");
 619 MODULE_ALIAS("ipt_TPROXY");
 620 MODULE_ALIAS("ip6t_TPROXY");