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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(void *priv,
 96                                 struct sk_buff *skb,
 97                                 const struct nf_hook_state *state)
 98 {
 99         struct nf_conn *ct;
100         enum ip_conntrack_info ctinfo;
101         const struct nf_conn_help *help;
102         const struct nf_conntrack_helper *helper;
103 
104         /* This is where we call the helper: as the packet goes out. */
105         ct = nf_ct_get(skb, &ctinfo);
106         if (!ct || ctinfo == IP_CT_RELATED_REPLY)
107                 return NF_ACCEPT;
108 
109         help = nfct_help(ct);
110         if (!help)
111                 return NF_ACCEPT;
112 
113         /* rcu_read_lock()ed by nf_hook_slow */
114         helper = rcu_dereference(help->helper);
115         if (!helper)
116                 return NF_ACCEPT;
117 
118         return helper->help(skb, skb_network_offset(skb) + ip_hdrlen(skb),
119                             ct, ctinfo);
120 }
121 
122 static unsigned int ipv4_confirm(void *priv,
123                                  struct sk_buff *skb,
124                                  const struct nf_hook_state *state)
125 {
126         struct nf_conn *ct;
127         enum ip_conntrack_info ctinfo;
128 
129         ct = nf_ct_get(skb, &ctinfo);
130         if (!ct || ctinfo == IP_CT_RELATED_REPLY)
131                 goto out;
132 
133         /* adjust seqs for loopback traffic only in outgoing direction */
134         if (test_bit(IPS_SEQ_ADJUST_BIT, &ct->status) &&
135             !nf_is_loopback_packet(skb)) {
136                 if (!nf_ct_seq_adjust(skb, ct, ctinfo, ip_hdrlen(skb))) {
137                         NF_CT_STAT_INC_ATOMIC(nf_ct_net(ct), drop);
138                         return NF_DROP;
139                 }
140         }
141 out:
142         /* We've seen it coming out the other side: confirm it */
143         return nf_conntrack_confirm(skb);
144 }
145 
146 static unsigned int ipv4_conntrack_in(void *priv,
147                                       struct sk_buff *skb,
148                                       const struct nf_hook_state *state)
149 {
150         return nf_conntrack_in(state->net, PF_INET, state->hook, skb);
151 }
152 
153 static unsigned int ipv4_conntrack_local(void *priv,
154                                          struct sk_buff *skb,
155                                          const struct nf_hook_state *state)
156 {
157         /* root is playing with raw sockets. */
158         if (skb->len < sizeof(struct iphdr) ||
159             ip_hdrlen(skb) < sizeof(struct iphdr))
160                 return NF_ACCEPT;
161         return nf_conntrack_in(state->net, PF_INET, state->hook, skb);
162 }
163 
164 /* Connection tracking may drop packets, but never alters them, so
165    make it the first hook. */
166 static struct nf_hook_ops ipv4_conntrack_ops[] __read_mostly = {
167         {
168                 .hook           = ipv4_conntrack_in,
169                 .pf             = NFPROTO_IPV4,
170                 .hooknum        = NF_INET_PRE_ROUTING,
171                 .priority       = NF_IP_PRI_CONNTRACK,
172         },
173         {
174                 .hook           = ipv4_conntrack_local,
175                 .pf             = NFPROTO_IPV4,
176                 .hooknum        = NF_INET_LOCAL_OUT,
177                 .priority       = NF_IP_PRI_CONNTRACK,
178         },
179         {
180                 .hook           = ipv4_helper,
181                 .pf             = NFPROTO_IPV4,
182                 .hooknum        = NF_INET_POST_ROUTING,
183                 .priority       = NF_IP_PRI_CONNTRACK_HELPER,
184         },
185         {
186                 .hook           = ipv4_confirm,
187                 .pf             = NFPROTO_IPV4,
188                 .hooknum        = NF_INET_POST_ROUTING,
189                 .priority       = NF_IP_PRI_CONNTRACK_CONFIRM,
190         },
191         {
192                 .hook           = ipv4_helper,
193                 .pf             = NFPROTO_IPV4,
194                 .hooknum        = NF_INET_LOCAL_IN,
195                 .priority       = NF_IP_PRI_CONNTRACK_HELPER,
196         },
197         {
198                 .hook           = ipv4_confirm,
199                 .pf             = NFPROTO_IPV4,
200                 .hooknum        = NF_INET_LOCAL_IN,
201                 .priority       = NF_IP_PRI_CONNTRACK_CONFIRM,
202         },
203 };
204 
205 #if defined(CONFIG_SYSCTL) && defined(CONFIG_NF_CONNTRACK_PROC_COMPAT)
206 static int log_invalid_proto_min = 0;
207 static int log_invalid_proto_max = 255;
208 
209 static struct ctl_table ip_ct_sysctl_table[] = {
210         {
211                 .procname       = "ip_conntrack_max",
212                 .maxlen         = sizeof(int),
213                 .mode           = 0644,
214                 .proc_handler   = proc_dointvec,
215         },
216         {
217                 .procname       = "ip_conntrack_count",
218                 .maxlen         = sizeof(int),
219                 .mode           = 0444,
220                 .proc_handler   = proc_dointvec,
221         },
222         {
223                 .procname       = "ip_conntrack_buckets",
224                 .maxlen         = sizeof(unsigned int),
225                 .mode           = 0444,
226                 .proc_handler   = proc_dointvec,
227         },
228         {
229                 .procname       = "ip_conntrack_checksum",
230                 .maxlen         = sizeof(int),
231                 .mode           = 0644,
232                 .proc_handler   = proc_dointvec,
233         },
234         {
235                 .procname       = "ip_conntrack_log_invalid",
236                 .maxlen         = sizeof(unsigned int),
237                 .mode           = 0644,
238                 .proc_handler   = proc_dointvec_minmax,
239                 .extra1         = &log_invalid_proto_min,
240                 .extra2         = &log_invalid_proto_max,
241         },
242         { }
243 };
244 #endif /* CONFIG_SYSCTL && CONFIG_NF_CONNTRACK_PROC_COMPAT */
245 
246 /* Fast function for those who don't want to parse /proc (and I don't
247    blame them). */
248 /* Reversing the socket's dst/src point of view gives us the reply
249    mapping. */
250 static int
251 getorigdst(struct sock *sk, int optval, void __user *user, int *len)
252 {
253         const struct inet_sock *inet = inet_sk(sk);
254         const struct nf_conntrack_tuple_hash *h;
255         struct nf_conntrack_tuple tuple;
256 
257         memset(&tuple, 0, sizeof(tuple));
258         tuple.src.u3.ip = inet->inet_rcv_saddr;
259         tuple.src.u.tcp.port = inet->inet_sport;
260         tuple.dst.u3.ip = inet->inet_daddr;
261         tuple.dst.u.tcp.port = inet->inet_dport;
262         tuple.src.l3num = PF_INET;
263         tuple.dst.protonum = sk->sk_protocol;
264 
265         /* We only do TCP and SCTP at the moment: is there a better way? */
266         if (sk->sk_protocol != IPPROTO_TCP && sk->sk_protocol != IPPROTO_SCTP) {
267                 pr_debug("SO_ORIGINAL_DST: Not a TCP/SCTP socket\n");
268                 return -ENOPROTOOPT;
269         }
270 
271         if ((unsigned int) *len < sizeof(struct sockaddr_in)) {
272                 pr_debug("SO_ORIGINAL_DST: len %d not %Zu\n",
273                          *len, sizeof(struct sockaddr_in));
274                 return -EINVAL;
275         }
276 
277         h = nf_conntrack_find_get(sock_net(sk), &nf_ct_zone_dflt, &tuple);
278         if (h) {
279                 struct sockaddr_in sin;
280                 struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h);
281 
282                 sin.sin_family = AF_INET;
283                 sin.sin_port = ct->tuplehash[IP_CT_DIR_ORIGINAL]
284                         .tuple.dst.u.tcp.port;
285                 sin.sin_addr.s_addr = ct->tuplehash[IP_CT_DIR_ORIGINAL]
286                         .tuple.dst.u3.ip;
287                 memset(sin.sin_zero, 0, sizeof(sin.sin_zero));
288 
289                 pr_debug("SO_ORIGINAL_DST: %pI4 %u\n",
290                          &sin.sin_addr.s_addr, ntohs(sin.sin_port));
291                 nf_ct_put(ct);
292                 if (copy_to_user(user, &sin, sizeof(sin)) != 0)
293                         return -EFAULT;
294                 else
295                         return 0;
296         }
297         pr_debug("SO_ORIGINAL_DST: Can't find %pI4/%u-%pI4/%u.\n",
298                  &tuple.src.u3.ip, ntohs(tuple.src.u.tcp.port),
299                  &tuple.dst.u3.ip, ntohs(tuple.dst.u.tcp.port));
300         return -ENOENT;
301 }
302 
303 #if IS_ENABLED(CONFIG_NF_CT_NETLINK)
304 
305 #include <linux/netfilter/nfnetlink.h>
306 #include <linux/netfilter/nfnetlink_conntrack.h>
307 
308 static int ipv4_tuple_to_nlattr(struct sk_buff *skb,
309                                 const struct nf_conntrack_tuple *tuple)
310 {
311         if (nla_put_in_addr(skb, CTA_IP_V4_SRC, tuple->src.u3.ip) ||
312             nla_put_in_addr(skb, CTA_IP_V4_DST, tuple->dst.u3.ip))
313                 goto nla_put_failure;
314         return 0;
315 
316 nla_put_failure:
317         return -1;
318 }
319 
320 static const struct nla_policy ipv4_nla_policy[CTA_IP_MAX+1] = {
321         [CTA_IP_V4_SRC] = { .type = NLA_U32 },
322         [CTA_IP_V4_DST] = { .type = NLA_U32 },
323 };
324 
325 static int ipv4_nlattr_to_tuple(struct nlattr *tb[],
326                                 struct nf_conntrack_tuple *t)
327 {
328         if (!tb[CTA_IP_V4_SRC] || !tb[CTA_IP_V4_DST])
329                 return -EINVAL;
330 
331         t->src.u3.ip = nla_get_in_addr(tb[CTA_IP_V4_SRC]);
332         t->dst.u3.ip = nla_get_in_addr(tb[CTA_IP_V4_DST]);
333 
334         return 0;
335 }
336 
337 static int ipv4_nlattr_tuple_size(void)
338 {
339         return nla_policy_len(ipv4_nla_policy, CTA_IP_MAX + 1);
340 }
341 #endif
342 
343 static struct nf_sockopt_ops so_getorigdst = {
344         .pf             = PF_INET,
345         .get_optmin     = SO_ORIGINAL_DST,
346         .get_optmax     = SO_ORIGINAL_DST+1,
347         .get            = getorigdst,
348         .owner          = THIS_MODULE,
349 };
350 
351 static int ipv4_init_net(struct net *net)
352 {
353 #if defined(CONFIG_SYSCTL) && defined(CONFIG_NF_CONNTRACK_PROC_COMPAT)
354         struct nf_ip_net *in = &net->ct.nf_ct_proto;
355         in->ctl_table = kmemdup(ip_ct_sysctl_table,
356                                 sizeof(ip_ct_sysctl_table),
357                                 GFP_KERNEL);
358         if (!in->ctl_table)
359                 return -ENOMEM;
360 
361         in->ctl_table[0].data = &nf_conntrack_max;
362         in->ctl_table[1].data = &net->ct.count;
363         in->ctl_table[2].data = &net->ct.htable_size;
364         in->ctl_table[3].data = &net->ct.sysctl_checksum;
365         in->ctl_table[4].data = &net->ct.sysctl_log_invalid;
366 #endif
367         return 0;
368 }
369 
370 struct nf_conntrack_l3proto nf_conntrack_l3proto_ipv4 __read_mostly = {
371         .l3proto         = PF_INET,
372         .name            = "ipv4",
373         .pkt_to_tuple    = ipv4_pkt_to_tuple,
374         .invert_tuple    = ipv4_invert_tuple,
375         .print_tuple     = ipv4_print_tuple,
376         .get_l4proto     = ipv4_get_l4proto,
377 #if IS_ENABLED(CONFIG_NF_CT_NETLINK)
378         .tuple_to_nlattr = ipv4_tuple_to_nlattr,
379         .nlattr_tuple_size = ipv4_nlattr_tuple_size,
380         .nlattr_to_tuple = ipv4_nlattr_to_tuple,
381         .nla_policy      = ipv4_nla_policy,
382 #endif
383 #if defined(CONFIG_SYSCTL) && defined(CONFIG_NF_CONNTRACK_PROC_COMPAT)
384         .ctl_table_path  = "net/ipv4/netfilter",
385 #endif
386         .init_net        = ipv4_init_net,
387         .me              = THIS_MODULE,
388 };
389 
390 module_param_call(hashsize, nf_conntrack_set_hashsize, param_get_uint,
391                   &nf_conntrack_htable_size, 0600);
392 
393 MODULE_ALIAS("nf_conntrack-" __stringify(AF_INET));
394 MODULE_ALIAS("ip_conntrack");
395 MODULE_LICENSE("GPL");
396 
397 static int ipv4_net_init(struct net *net)
398 {
399         int ret = 0;
400 
401         ret = nf_ct_l4proto_pernet_register(net, &nf_conntrack_l4proto_tcp4);
402         if (ret < 0) {
403                 pr_err("nf_conntrack_tcp4: pernet registration failed\n");
404                 goto out_tcp;
405         }
406         ret = nf_ct_l4proto_pernet_register(net, &nf_conntrack_l4proto_udp4);
407         if (ret < 0) {
408                 pr_err("nf_conntrack_udp4: pernet registration failed\n");
409                 goto out_udp;
410         }
411         ret = nf_ct_l4proto_pernet_register(net, &nf_conntrack_l4proto_icmp);
412         if (ret < 0) {
413                 pr_err("nf_conntrack_icmp4: pernet registration failed\n");
414                 goto out_icmp;
415         }
416         ret = nf_ct_l3proto_pernet_register(net, &nf_conntrack_l3proto_ipv4);
417         if (ret < 0) {
418                 pr_err("nf_conntrack_ipv4: pernet registration failed\n");
419                 goto out_ipv4;
420         }
421         return 0;
422 out_ipv4:
423         nf_ct_l4proto_pernet_unregister(net, &nf_conntrack_l4proto_icmp);
424 out_icmp:
425         nf_ct_l4proto_pernet_unregister(net, &nf_conntrack_l4proto_udp4);
426 out_udp:
427         nf_ct_l4proto_pernet_unregister(net, &nf_conntrack_l4proto_tcp4);
428 out_tcp:
429         return ret;
430 }
431 
432 static void ipv4_net_exit(struct net *net)
433 {
434         nf_ct_l3proto_pernet_unregister(net, &nf_conntrack_l3proto_ipv4);
435         nf_ct_l4proto_pernet_unregister(net, &nf_conntrack_l4proto_icmp);
436         nf_ct_l4proto_pernet_unregister(net, &nf_conntrack_l4proto_udp4);
437         nf_ct_l4proto_pernet_unregister(net, &nf_conntrack_l4proto_tcp4);
438 }
439 
440 static struct pernet_operations ipv4_net_ops = {
441         .init = ipv4_net_init,
442         .exit = ipv4_net_exit,
443 };
444 
445 static int __init nf_conntrack_l3proto_ipv4_init(void)
446 {
447         int ret = 0;
448 
449         need_conntrack();
450         nf_defrag_ipv4_enable();
451 
452         ret = nf_register_sockopt(&so_getorigdst);
453         if (ret < 0) {
454                 pr_err("Unable to register netfilter socket option\n");
455                 return ret;
456         }
457 
458         ret = register_pernet_subsys(&ipv4_net_ops);
459         if (ret < 0) {
460                 pr_err("nf_conntrack_ipv4: can't register pernet ops\n");
461                 goto cleanup_sockopt;
462         }
463 
464         ret = nf_register_hooks(ipv4_conntrack_ops,
465                                 ARRAY_SIZE(ipv4_conntrack_ops));
466         if (ret < 0) {
467                 pr_err("nf_conntrack_ipv4: can't register hooks.\n");
468                 goto cleanup_pernet;
469         }
470 
471         ret = nf_ct_l4proto_register(&nf_conntrack_l4proto_tcp4);
472         if (ret < 0) {
473                 pr_err("nf_conntrack_ipv4: can't register tcp4 proto.\n");
474                 goto cleanup_hooks;
475         }
476 
477         ret = nf_ct_l4proto_register(&nf_conntrack_l4proto_udp4);
478         if (ret < 0) {
479                 pr_err("nf_conntrack_ipv4: can't register udp4 proto.\n");
480                 goto cleanup_tcp4;
481         }
482 
483         ret = nf_ct_l4proto_register(&nf_conntrack_l4proto_icmp);
484         if (ret < 0) {
485                 pr_err("nf_conntrack_ipv4: can't register icmpv4 proto.\n");
486                 goto cleanup_udp4;
487         }
488 
489         ret = nf_ct_l3proto_register(&nf_conntrack_l3proto_ipv4);
490         if (ret < 0) {
491                 pr_err("nf_conntrack_ipv4: can't register ipv4 proto.\n");
492                 goto cleanup_icmpv4;
493         }
494 
495 #if defined(CONFIG_PROC_FS) && defined(CONFIG_NF_CONNTRACK_PROC_COMPAT)
496         ret = nf_conntrack_ipv4_compat_init();
497         if (ret < 0)
498                 goto cleanup_proto;
499 #endif
500         return ret;
501 #if defined(CONFIG_PROC_FS) && defined(CONFIG_NF_CONNTRACK_PROC_COMPAT)
502  cleanup_proto:
503         nf_ct_l3proto_unregister(&nf_conntrack_l3proto_ipv4);
504 #endif
505  cleanup_icmpv4:
506         nf_ct_l4proto_unregister(&nf_conntrack_l4proto_icmp);
507  cleanup_udp4:
508         nf_ct_l4proto_unregister(&nf_conntrack_l4proto_udp4);
509  cleanup_tcp4:
510         nf_ct_l4proto_unregister(&nf_conntrack_l4proto_tcp4);
511  cleanup_hooks:
512         nf_unregister_hooks(ipv4_conntrack_ops, ARRAY_SIZE(ipv4_conntrack_ops));
513  cleanup_pernet:
514         unregister_pernet_subsys(&ipv4_net_ops);
515  cleanup_sockopt:
516         nf_unregister_sockopt(&so_getorigdst);
517         return ret;
518 }
519 
520 static void __exit nf_conntrack_l3proto_ipv4_fini(void)
521 {
522         synchronize_net();
523 #if defined(CONFIG_PROC_FS) && defined(CONFIG_NF_CONNTRACK_PROC_COMPAT)
524         nf_conntrack_ipv4_compat_fini();
525 #endif
526         nf_ct_l3proto_unregister(&nf_conntrack_l3proto_ipv4);
527         nf_ct_l4proto_unregister(&nf_conntrack_l4proto_icmp);
528         nf_ct_l4proto_unregister(&nf_conntrack_l4proto_udp4);
529         nf_ct_l4proto_unregister(&nf_conntrack_l4proto_tcp4);
530         nf_unregister_hooks(ipv4_conntrack_ops, ARRAY_SIZE(ipv4_conntrack_ops));
531         unregister_pernet_subsys(&ipv4_net_ops);
532         nf_unregister_sockopt(&so_getorigdst);
533 }
534 
535 module_init(nf_conntrack_l3proto_ipv4_init);
536 module_exit(nf_conntrack_l3proto_ipv4_fini);
537 

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