~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/net/netfilter/xt_TPROXY.c

Version: ~ [ linux-5.13-rc5 ] ~ [ linux-5.12.9 ] ~ [ linux-5.11.22 ] ~ [ linux-5.10.42 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.124 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.193 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.235 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.271 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.271 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.18.140 ] ~ [ linux-3.16.85 ] ~ [ linux-3.14.79 ] ~ [ linux-3.12.74 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

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

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp