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

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

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