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TOMOYO Linux Cross Reference
Linux/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c

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  1 
  2 /* (C) 1999-2001 Paul `Rusty' Russell
  3  * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
  4  * (C) 2006-2012 Patrick McHardy <kaber@trash.net>
  5  *
  6  * This program is free software; you can redistribute it and/or modify
  7  * it under the terms of the GNU General Public License version 2 as
  8  * published by the Free Software Foundation.
  9  */
 10 
 11 #include <linux/types.h>
 12 #include <linux/ip.h>
 13 #include <linux/netfilter.h>
 14 #include <linux/module.h>
 15 #include <linux/skbuff.h>
 16 #include <linux/icmp.h>
 17 #include <linux/sysctl.h>
 18 #include <net/route.h>
 19 #include <net/ip.h>
 20 
 21 #include <linux/netfilter_ipv4.h>
 22 #include <net/netfilter/nf_conntrack.h>
 23 #include <net/netfilter/nf_conntrack_helper.h>
 24 #include <net/netfilter/nf_conntrack_l4proto.h>
 25 #include <net/netfilter/nf_conntrack_l3proto.h>
 26 #include <net/netfilter/nf_conntrack_zones.h>
 27 #include <net/netfilter/nf_conntrack_core.h>
 28 #include <net/netfilter/nf_conntrack_seqadj.h>
 29 #include <net/netfilter/ipv4/nf_conntrack_ipv4.h>
 30 #include <net/netfilter/nf_nat_helper.h>
 31 #include <net/netfilter/ipv4/nf_defrag_ipv4.h>
 32 #include <net/netfilter/nf_log.h>
 33 
 34 static bool ipv4_pkt_to_tuple(const struct sk_buff *skb, unsigned int nhoff,
 35                               struct nf_conntrack_tuple *tuple)
 36 {
 37         const __be32 *ap;
 38         __be32 _addrs[2];
 39         ap = skb_header_pointer(skb, nhoff + offsetof(struct iphdr, saddr),
 40                                 sizeof(u_int32_t) * 2, _addrs);
 41         if (ap == NULL)
 42                 return false;
 43 
 44         tuple->src.u3.ip = ap[0];
 45         tuple->dst.u3.ip = ap[1];
 46 
 47         return true;
 48 }
 49 
 50 static bool ipv4_invert_tuple(struct nf_conntrack_tuple *tuple,
 51                               const struct nf_conntrack_tuple *orig)
 52 {
 53         tuple->src.u3.ip = orig->dst.u3.ip;
 54         tuple->dst.u3.ip = orig->src.u3.ip;
 55 
 56         return true;
 57 }
 58 
 59 static void ipv4_print_tuple(struct seq_file *s,
 60                             const struct nf_conntrack_tuple *tuple)
 61 {
 62         seq_printf(s, "src=%pI4 dst=%pI4 ",
 63                    &tuple->src.u3.ip, &tuple->dst.u3.ip);
 64 }
 65 
 66 static int ipv4_get_l4proto(const struct sk_buff *skb, unsigned int nhoff,
 67                             unsigned int *dataoff, u_int8_t *protonum)
 68 {
 69         const struct iphdr *iph;
 70         struct iphdr _iph;
 71 
 72         iph = skb_header_pointer(skb, nhoff, sizeof(_iph), &_iph);
 73         if (iph == NULL)
 74                 return -NF_ACCEPT;
 75 
 76         /* Conntrack defragments packets, we might still see fragments
 77          * inside ICMP packets though. */
 78         if (iph->frag_off & htons(IP_OFFSET))
 79                 return -NF_ACCEPT;
 80 
 81         *dataoff = nhoff + (iph->ihl << 2);
 82         *protonum = iph->protocol;
 83 
 84         /* Check bogus IP headers */
 85         if (*dataoff > skb->len) {
 86                 pr_debug("nf_conntrack_ipv4: bogus IPv4 packet: "
 87                          "nhoff %u, ihl %u, skblen %u\n",
 88                          nhoff, iph->ihl << 2, skb->len);
 89                 return -NF_ACCEPT;
 90         }
 91 
 92         return NF_ACCEPT;
 93 }
 94 
 95 static unsigned int ipv4_helper(const struct nf_hook_ops *ops,
 96                                 struct sk_buff *skb,
 97                                 const struct net_device *in,
 98                                 const struct net_device *out,
 99                                 int (*okfn)(struct sk_buff *))
100 {
101         struct nf_conn *ct;
102         enum ip_conntrack_info ctinfo;
103         const struct nf_conn_help *help;
104         const struct nf_conntrack_helper *helper;
105 
106         /* This is where we call the helper: as the packet goes out. */
107         ct = nf_ct_get(skb, &ctinfo);
108         if (!ct || ctinfo == IP_CT_RELATED_REPLY)
109                 return NF_ACCEPT;
110 
111         help = nfct_help(ct);
112         if (!help)
113                 return NF_ACCEPT;
114 
115         /* rcu_read_lock()ed by nf_hook_slow */
116         helper = rcu_dereference(help->helper);
117         if (!helper)
118                 return NF_ACCEPT;
119 
120         return helper->help(skb, skb_network_offset(skb) + ip_hdrlen(skb),
121                             ct, ctinfo);
122 }
123 
124 static unsigned int ipv4_confirm(const struct nf_hook_ops *ops,
125                                  struct sk_buff *skb,
126                                  const struct net_device *in,
127                                  const struct net_device *out,
128                                  int (*okfn)(struct sk_buff *))
129 {
130         struct nf_conn *ct;
131         enum ip_conntrack_info ctinfo;
132 
133         ct = nf_ct_get(skb, &ctinfo);
134         if (!ct || ctinfo == IP_CT_RELATED_REPLY)
135                 goto out;
136 
137         /* adjust seqs for loopback traffic only in outgoing direction */
138         if (test_bit(IPS_SEQ_ADJUST_BIT, &ct->status) &&
139             !nf_is_loopback_packet(skb)) {
140                 if (!nf_ct_seq_adjust(skb, ct, ctinfo, ip_hdrlen(skb))) {
141                         NF_CT_STAT_INC_ATOMIC(nf_ct_net(ct), drop);
142                         return NF_DROP;
143                 }
144         }
145 out:
146         /* We've seen it coming out the other side: confirm it */
147         return nf_conntrack_confirm(skb);
148 }
149 
150 static unsigned int ipv4_conntrack_in(const struct nf_hook_ops *ops,
151                                       struct sk_buff *skb,
152                                       const struct net_device *in,
153                                       const struct net_device *out,
154                                       int (*okfn)(struct sk_buff *))
155 {
156         return nf_conntrack_in(dev_net(in), PF_INET, ops->hooknum, skb);
157 }
158 
159 static unsigned int ipv4_conntrack_local(const struct nf_hook_ops *ops,
160                                          struct sk_buff *skb,
161                                          const struct net_device *in,
162                                          const struct net_device *out,
163                                          int (*okfn)(struct sk_buff *))
164 {
165         /* root is playing with raw sockets. */
166         if (skb->len < sizeof(struct iphdr) ||
167             ip_hdrlen(skb) < sizeof(struct iphdr))
168                 return NF_ACCEPT;
169         return nf_conntrack_in(dev_net(out), PF_INET, ops->hooknum, skb);
170 }
171 
172 /* Connection tracking may drop packets, but never alters them, so
173    make it the first hook. */
174 static struct nf_hook_ops ipv4_conntrack_ops[] __read_mostly = {
175         {
176                 .hook           = ipv4_conntrack_in,
177                 .owner          = THIS_MODULE,
178                 .pf             = NFPROTO_IPV4,
179                 .hooknum        = NF_INET_PRE_ROUTING,
180                 .priority       = NF_IP_PRI_CONNTRACK,
181         },
182         {
183                 .hook           = ipv4_conntrack_local,
184                 .owner          = THIS_MODULE,
185                 .pf             = NFPROTO_IPV4,
186                 .hooknum        = NF_INET_LOCAL_OUT,
187                 .priority       = NF_IP_PRI_CONNTRACK,
188         },
189         {
190                 .hook           = ipv4_helper,
191                 .owner          = THIS_MODULE,
192                 .pf             = NFPROTO_IPV4,
193                 .hooknum        = NF_INET_POST_ROUTING,
194                 .priority       = NF_IP_PRI_CONNTRACK_HELPER,
195         },
196         {
197                 .hook           = ipv4_confirm,
198                 .owner          = THIS_MODULE,
199                 .pf             = NFPROTO_IPV4,
200                 .hooknum        = NF_INET_POST_ROUTING,
201                 .priority       = NF_IP_PRI_CONNTRACK_CONFIRM,
202         },
203         {
204                 .hook           = ipv4_helper,
205                 .owner          = THIS_MODULE,
206                 .pf             = NFPROTO_IPV4,
207                 .hooknum        = NF_INET_LOCAL_IN,
208                 .priority       = NF_IP_PRI_CONNTRACK_HELPER,
209         },
210         {
211                 .hook           = ipv4_confirm,
212                 .owner          = THIS_MODULE,
213                 .pf             = NFPROTO_IPV4,
214                 .hooknum        = NF_INET_LOCAL_IN,
215                 .priority       = NF_IP_PRI_CONNTRACK_CONFIRM,
216         },
217 };
218 
219 #if defined(CONFIG_SYSCTL) && defined(CONFIG_NF_CONNTRACK_PROC_COMPAT)
220 static int log_invalid_proto_min = 0;
221 static int log_invalid_proto_max = 255;
222 
223 static struct ctl_table ip_ct_sysctl_table[] = {
224         {
225                 .procname       = "ip_conntrack_max",
226                 .maxlen         = sizeof(int),
227                 .mode           = 0644,
228                 .proc_handler   = proc_dointvec,
229         },
230         {
231                 .procname       = "ip_conntrack_count",
232                 .maxlen         = sizeof(int),
233                 .mode           = 0444,
234                 .proc_handler   = proc_dointvec,
235         },
236         {
237                 .procname       = "ip_conntrack_buckets",
238                 .maxlen         = sizeof(unsigned int),
239                 .mode           = 0444,
240                 .proc_handler   = proc_dointvec,
241         },
242         {
243                 .procname       = "ip_conntrack_checksum",
244                 .maxlen         = sizeof(int),
245                 .mode           = 0644,
246                 .proc_handler   = proc_dointvec,
247         },
248         {
249                 .procname       = "ip_conntrack_log_invalid",
250                 .maxlen         = sizeof(unsigned int),
251                 .mode           = 0644,
252                 .proc_handler   = proc_dointvec_minmax,
253                 .extra1         = &log_invalid_proto_min,
254                 .extra2         = &log_invalid_proto_max,
255         },
256         { }
257 };
258 #endif /* CONFIG_SYSCTL && CONFIG_NF_CONNTRACK_PROC_COMPAT */
259 
260 /* Fast function for those who don't want to parse /proc (and I don't
261    blame them). */
262 /* Reversing the socket's dst/src point of view gives us the reply
263    mapping. */
264 static int
265 getorigdst(struct sock *sk, int optval, void __user *user, int *len)
266 {
267         const struct inet_sock *inet = inet_sk(sk);
268         const struct nf_conntrack_tuple_hash *h;
269         struct nf_conntrack_tuple tuple;
270 
271         memset(&tuple, 0, sizeof(tuple));
272         tuple.src.u3.ip = inet->inet_rcv_saddr;
273         tuple.src.u.tcp.port = inet->inet_sport;
274         tuple.dst.u3.ip = inet->inet_daddr;
275         tuple.dst.u.tcp.port = inet->inet_dport;
276         tuple.src.l3num = PF_INET;
277         tuple.dst.protonum = sk->sk_protocol;
278 
279         /* We only do TCP and SCTP at the moment: is there a better way? */
280         if (sk->sk_protocol != IPPROTO_TCP && sk->sk_protocol != IPPROTO_SCTP) {
281                 pr_debug("SO_ORIGINAL_DST: Not a TCP/SCTP socket\n");
282                 return -ENOPROTOOPT;
283         }
284 
285         if ((unsigned int) *len < sizeof(struct sockaddr_in)) {
286                 pr_debug("SO_ORIGINAL_DST: len %d not %Zu\n",
287                          *len, sizeof(struct sockaddr_in));
288                 return -EINVAL;
289         }
290 
291         h = nf_conntrack_find_get(sock_net(sk), NF_CT_DEFAULT_ZONE, &tuple);
292         if (h) {
293                 struct sockaddr_in sin;
294                 struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h);
295 
296                 sin.sin_family = AF_INET;
297                 sin.sin_port = ct->tuplehash[IP_CT_DIR_ORIGINAL]
298                         .tuple.dst.u.tcp.port;
299                 sin.sin_addr.s_addr = ct->tuplehash[IP_CT_DIR_ORIGINAL]
300                         .tuple.dst.u3.ip;
301                 memset(sin.sin_zero, 0, sizeof(sin.sin_zero));
302 
303                 pr_debug("SO_ORIGINAL_DST: %pI4 %u\n",
304                          &sin.sin_addr.s_addr, ntohs(sin.sin_port));
305                 nf_ct_put(ct);
306                 if (copy_to_user(user, &sin, sizeof(sin)) != 0)
307                         return -EFAULT;
308                 else
309                         return 0;
310         }
311         pr_debug("SO_ORIGINAL_DST: Can't find %pI4/%u-%pI4/%u.\n",
312                  &tuple.src.u3.ip, ntohs(tuple.src.u.tcp.port),
313                  &tuple.dst.u3.ip, ntohs(tuple.dst.u.tcp.port));
314         return -ENOENT;
315 }
316 
317 #if IS_ENABLED(CONFIG_NF_CT_NETLINK)
318 
319 #include <linux/netfilter/nfnetlink.h>
320 #include <linux/netfilter/nfnetlink_conntrack.h>
321 
322 static int ipv4_tuple_to_nlattr(struct sk_buff *skb,
323                                 const struct nf_conntrack_tuple *tuple)
324 {
325         if (nla_put_be32(skb, CTA_IP_V4_SRC, tuple->src.u3.ip) ||
326             nla_put_be32(skb, CTA_IP_V4_DST, tuple->dst.u3.ip))
327                 goto nla_put_failure;
328         return 0;
329 
330 nla_put_failure:
331         return -1;
332 }
333 
334 static const struct nla_policy ipv4_nla_policy[CTA_IP_MAX+1] = {
335         [CTA_IP_V4_SRC] = { .type = NLA_U32 },
336         [CTA_IP_V4_DST] = { .type = NLA_U32 },
337 };
338 
339 static int ipv4_nlattr_to_tuple(struct nlattr *tb[],
340                                 struct nf_conntrack_tuple *t)
341 {
342         if (!tb[CTA_IP_V4_SRC] || !tb[CTA_IP_V4_DST])
343                 return -EINVAL;
344 
345         t->src.u3.ip = nla_get_be32(tb[CTA_IP_V4_SRC]);
346         t->dst.u3.ip = nla_get_be32(tb[CTA_IP_V4_DST]);
347 
348         return 0;
349 }
350 
351 static int ipv4_nlattr_tuple_size(void)
352 {
353         return nla_policy_len(ipv4_nla_policy, CTA_IP_MAX + 1);
354 }
355 #endif
356 
357 static struct nf_sockopt_ops so_getorigdst = {
358         .pf             = PF_INET,
359         .get_optmin     = SO_ORIGINAL_DST,
360         .get_optmax     = SO_ORIGINAL_DST+1,
361         .get            = getorigdst,
362         .owner          = THIS_MODULE,
363 };
364 
365 static int ipv4_init_net(struct net *net)
366 {
367 #if defined(CONFIG_SYSCTL) && defined(CONFIG_NF_CONNTRACK_PROC_COMPAT)
368         struct nf_ip_net *in = &net->ct.nf_ct_proto;
369         in->ctl_table = kmemdup(ip_ct_sysctl_table,
370                                 sizeof(ip_ct_sysctl_table),
371                                 GFP_KERNEL);
372         if (!in->ctl_table)
373                 return -ENOMEM;
374 
375         in->ctl_table[0].data = &nf_conntrack_max;
376         in->ctl_table[1].data = &net->ct.count;
377         in->ctl_table[2].data = &net->ct.htable_size;
378         in->ctl_table[3].data = &net->ct.sysctl_checksum;
379         in->ctl_table[4].data = &net->ct.sysctl_log_invalid;
380 #endif
381         return 0;
382 }
383 
384 struct nf_conntrack_l3proto nf_conntrack_l3proto_ipv4 __read_mostly = {
385         .l3proto         = PF_INET,
386         .name            = "ipv4",
387         .pkt_to_tuple    = ipv4_pkt_to_tuple,
388         .invert_tuple    = ipv4_invert_tuple,
389         .print_tuple     = ipv4_print_tuple,
390         .get_l4proto     = ipv4_get_l4proto,
391 #if IS_ENABLED(CONFIG_NF_CT_NETLINK)
392         .tuple_to_nlattr = ipv4_tuple_to_nlattr,
393         .nlattr_tuple_size = ipv4_nlattr_tuple_size,
394         .nlattr_to_tuple = ipv4_nlattr_to_tuple,
395         .nla_policy      = ipv4_nla_policy,
396 #endif
397 #if defined(CONFIG_SYSCTL) && defined(CONFIG_NF_CONNTRACK_PROC_COMPAT)
398         .ctl_table_path  = "net/ipv4/netfilter",
399 #endif
400         .init_net        = ipv4_init_net,
401         .me              = THIS_MODULE,
402 };
403 
404 module_param_call(hashsize, nf_conntrack_set_hashsize, param_get_uint,
405                   &nf_conntrack_htable_size, 0600);
406 
407 MODULE_ALIAS("nf_conntrack-" __stringify(AF_INET));
408 MODULE_ALIAS("ip_conntrack");
409 MODULE_LICENSE("GPL");
410 
411 static int ipv4_net_init(struct net *net)
412 {
413         int ret = 0;
414 
415         ret = nf_ct_l4proto_pernet_register(net, &nf_conntrack_l4proto_tcp4);
416         if (ret < 0) {
417                 pr_err("nf_conntrack_tcp4: pernet registration failed\n");
418                 goto out_tcp;
419         }
420         ret = nf_ct_l4proto_pernet_register(net, &nf_conntrack_l4proto_udp4);
421         if (ret < 0) {
422                 pr_err("nf_conntrack_udp4: pernet registration failed\n");
423                 goto out_udp;
424         }
425         ret = nf_ct_l4proto_pernet_register(net, &nf_conntrack_l4proto_icmp);
426         if (ret < 0) {
427                 pr_err("nf_conntrack_icmp4: pernet registration failed\n");
428                 goto out_icmp;
429         }
430         ret = nf_ct_l3proto_pernet_register(net, &nf_conntrack_l3proto_ipv4);
431         if (ret < 0) {
432                 pr_err("nf_conntrack_ipv4: pernet registration failed\n");
433                 goto out_ipv4;
434         }
435         return 0;
436 out_ipv4:
437         nf_ct_l4proto_pernet_unregister(net, &nf_conntrack_l4proto_icmp);
438 out_icmp:
439         nf_ct_l4proto_pernet_unregister(net, &nf_conntrack_l4proto_udp4);
440 out_udp:
441         nf_ct_l4proto_pernet_unregister(net, &nf_conntrack_l4proto_tcp4);
442 out_tcp:
443         return ret;
444 }
445 
446 static void ipv4_net_exit(struct net *net)
447 {
448         nf_ct_l3proto_pernet_unregister(net, &nf_conntrack_l3proto_ipv4);
449         nf_ct_l4proto_pernet_unregister(net, &nf_conntrack_l4proto_icmp);
450         nf_ct_l4proto_pernet_unregister(net, &nf_conntrack_l4proto_udp4);
451         nf_ct_l4proto_pernet_unregister(net, &nf_conntrack_l4proto_tcp4);
452 }
453 
454 static struct pernet_operations ipv4_net_ops = {
455         .init = ipv4_net_init,
456         .exit = ipv4_net_exit,
457 };
458 
459 static int __init nf_conntrack_l3proto_ipv4_init(void)
460 {
461         int ret = 0;
462 
463         need_conntrack();
464         nf_defrag_ipv4_enable();
465 
466         ret = nf_register_sockopt(&so_getorigdst);
467         if (ret < 0) {
468                 printk(KERN_ERR "Unable to register netfilter socket option\n");
469                 return ret;
470         }
471 
472         ret = register_pernet_subsys(&ipv4_net_ops);
473         if (ret < 0) {
474                 pr_err("nf_conntrack_ipv4: can't register pernet ops\n");
475                 goto cleanup_sockopt;
476         }
477 
478         ret = nf_register_hooks(ipv4_conntrack_ops,
479                                 ARRAY_SIZE(ipv4_conntrack_ops));
480         if (ret < 0) {
481                 pr_err("nf_conntrack_ipv4: can't register hooks.\n");
482                 goto cleanup_pernet;
483         }
484 
485         ret = nf_ct_l4proto_register(&nf_conntrack_l4proto_tcp4);
486         if (ret < 0) {
487                 pr_err("nf_conntrack_ipv4: can't register tcp4 proto.\n");
488                 goto cleanup_hooks;
489         }
490 
491         ret = nf_ct_l4proto_register(&nf_conntrack_l4proto_udp4);
492         if (ret < 0) {
493                 pr_err("nf_conntrack_ipv4: can't register udp4 proto.\n");
494                 goto cleanup_tcp4;
495         }
496 
497         ret = nf_ct_l4proto_register(&nf_conntrack_l4proto_icmp);
498         if (ret < 0) {
499                 pr_err("nf_conntrack_ipv4: can't register icmpv4 proto.\n");
500                 goto cleanup_udp4;
501         }
502 
503         ret = nf_ct_l3proto_register(&nf_conntrack_l3proto_ipv4);
504         if (ret < 0) {
505                 pr_err("nf_conntrack_ipv4: can't register ipv4 proto.\n");
506                 goto cleanup_icmpv4;
507         }
508 
509 #if defined(CONFIG_PROC_FS) && defined(CONFIG_NF_CONNTRACK_PROC_COMPAT)
510         ret = nf_conntrack_ipv4_compat_init();
511         if (ret < 0)
512                 goto cleanup_proto;
513 #endif
514         return ret;
515 #if defined(CONFIG_PROC_FS) && defined(CONFIG_NF_CONNTRACK_PROC_COMPAT)
516  cleanup_proto:
517         nf_ct_l3proto_unregister(&nf_conntrack_l3proto_ipv4);
518 #endif
519  cleanup_icmpv4:
520         nf_ct_l4proto_unregister(&nf_conntrack_l4proto_icmp);
521  cleanup_udp4:
522         nf_ct_l4proto_unregister(&nf_conntrack_l4proto_udp4);
523  cleanup_tcp4:
524         nf_ct_l4proto_unregister(&nf_conntrack_l4proto_tcp4);
525  cleanup_hooks:
526         nf_unregister_hooks(ipv4_conntrack_ops, ARRAY_SIZE(ipv4_conntrack_ops));
527  cleanup_pernet:
528         unregister_pernet_subsys(&ipv4_net_ops);
529  cleanup_sockopt:
530         nf_unregister_sockopt(&so_getorigdst);
531         return ret;
532 }
533 
534 static void __exit nf_conntrack_l3proto_ipv4_fini(void)
535 {
536         synchronize_net();
537 #if defined(CONFIG_PROC_FS) && defined(CONFIG_NF_CONNTRACK_PROC_COMPAT)
538         nf_conntrack_ipv4_compat_fini();
539 #endif
540         nf_ct_l3proto_unregister(&nf_conntrack_l3proto_ipv4);
541         nf_ct_l4proto_unregister(&nf_conntrack_l4proto_icmp);
542         nf_ct_l4proto_unregister(&nf_conntrack_l4proto_udp4);
543         nf_ct_l4proto_unregister(&nf_conntrack_l4proto_tcp4);
544         nf_unregister_hooks(ipv4_conntrack_ops, ARRAY_SIZE(ipv4_conntrack_ops));
545         unregister_pernet_subsys(&ipv4_net_ops);
546         nf_unregister_sockopt(&so_getorigdst);
547 }
548 
549 module_init(nf_conntrack_l3proto_ipv4_init);
550 module_exit(nf_conntrack_l3proto_ipv4_fini);
551 

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