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Linux/net/netfilter/nf_conntrack_standalone.c

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  1 /* (C) 1999-2001 Paul `Rusty' Russell
  2  * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
  3  * (C) 2005-2012 Patrick McHardy <kaber@trash.net>
  4  *
  5  * This program is free software; you can redistribute it and/or modify
  6  * it under the terms of the GNU General Public License version 2 as
  7  * published by the Free Software Foundation.
  8  */
  9 
 10 #include <linux/types.h>
 11 #include <linux/netfilter.h>
 12 #include <linux/slab.h>
 13 #include <linux/module.h>
 14 #include <linux/skbuff.h>
 15 #include <linux/proc_fs.h>
 16 #include <linux/seq_file.h>
 17 #include <linux/percpu.h>
 18 #include <linux/netdevice.h>
 19 #include <linux/security.h>
 20 #include <net/net_namespace.h>
 21 #ifdef CONFIG_SYSCTL
 22 #include <linux/sysctl.h>
 23 #endif
 24 
 25 #include <net/netfilter/nf_conntrack.h>
 26 #include <net/netfilter/nf_conntrack_core.h>
 27 #include <net/netfilter/nf_conntrack_l3proto.h>
 28 #include <net/netfilter/nf_conntrack_l4proto.h>
 29 #include <net/netfilter/nf_conntrack_expect.h>
 30 #include <net/netfilter/nf_conntrack_helper.h>
 31 #include <net/netfilter/nf_conntrack_acct.h>
 32 #include <net/netfilter/nf_conntrack_zones.h>
 33 #include <net/netfilter/nf_conntrack_timestamp.h>
 34 #include <linux/rculist_nulls.h>
 35 
 36 MODULE_LICENSE("GPL");
 37 
 38 #ifdef CONFIG_NF_CONNTRACK_PROCFS
 39 int
 40 print_tuple(struct seq_file *s, const struct nf_conntrack_tuple *tuple,
 41             const struct nf_conntrack_l3proto *l3proto,
 42             const struct nf_conntrack_l4proto *l4proto)
 43 {
 44         return l3proto->print_tuple(s, tuple) || l4proto->print_tuple(s, tuple);
 45 }
 46 EXPORT_SYMBOL_GPL(print_tuple);
 47 
 48 struct ct_iter_state {
 49         struct seq_net_private p;
 50         unsigned int bucket;
 51         u_int64_t time_now;
 52 };
 53 
 54 static struct hlist_nulls_node *ct_get_first(struct seq_file *seq)
 55 {
 56         struct net *net = seq_file_net(seq);
 57         struct ct_iter_state *st = seq->private;
 58         struct hlist_nulls_node *n;
 59 
 60         for (st->bucket = 0;
 61              st->bucket < net->ct.htable_size;
 62              st->bucket++) {
 63                 n = rcu_dereference(hlist_nulls_first_rcu(&net->ct.hash[st->bucket]));
 64                 if (!is_a_nulls(n))
 65                         return n;
 66         }
 67         return NULL;
 68 }
 69 
 70 static struct hlist_nulls_node *ct_get_next(struct seq_file *seq,
 71                                       struct hlist_nulls_node *head)
 72 {
 73         struct net *net = seq_file_net(seq);
 74         struct ct_iter_state *st = seq->private;
 75 
 76         head = rcu_dereference(hlist_nulls_next_rcu(head));
 77         while (is_a_nulls(head)) {
 78                 if (likely(get_nulls_value(head) == st->bucket)) {
 79                         if (++st->bucket >= net->ct.htable_size)
 80                                 return NULL;
 81                 }
 82                 head = rcu_dereference(
 83                                 hlist_nulls_first_rcu(
 84                                         &net->ct.hash[st->bucket]));
 85         }
 86         return head;
 87 }
 88 
 89 static struct hlist_nulls_node *ct_get_idx(struct seq_file *seq, loff_t pos)
 90 {
 91         struct hlist_nulls_node *head = ct_get_first(seq);
 92 
 93         if (head)
 94                 while (pos && (head = ct_get_next(seq, head)))
 95                         pos--;
 96         return pos ? NULL : head;
 97 }
 98 
 99 static void *ct_seq_start(struct seq_file *seq, loff_t *pos)
100         __acquires(RCU)
101 {
102         struct ct_iter_state *st = seq->private;
103 
104         st->time_now = ktime_to_ns(ktime_get_real());
105         rcu_read_lock();
106         return ct_get_idx(seq, *pos);
107 }
108 
109 static void *ct_seq_next(struct seq_file *s, void *v, loff_t *pos)
110 {
111         (*pos)++;
112         return ct_get_next(s, v);
113 }
114 
115 static void ct_seq_stop(struct seq_file *s, void *v)
116         __releases(RCU)
117 {
118         rcu_read_unlock();
119 }
120 
121 #ifdef CONFIG_NF_CONNTRACK_SECMARK
122 static int ct_show_secctx(struct seq_file *s, const struct nf_conn *ct)
123 {
124         int ret;
125         u32 len;
126         char *secctx;
127 
128         ret = security_secid_to_secctx(ct->secmark, &secctx, &len);
129         if (ret)
130                 return 0;
131 
132         ret = seq_printf(s, "secctx=%s ", secctx);
133 
134         security_release_secctx(secctx, len);
135         return ret;
136 }
137 #else
138 static inline int ct_show_secctx(struct seq_file *s, const struct nf_conn *ct)
139 {
140         return 0;
141 }
142 #endif
143 
144 #ifdef CONFIG_NF_CONNTRACK_TIMESTAMP
145 static int ct_show_delta_time(struct seq_file *s, const struct nf_conn *ct)
146 {
147         struct ct_iter_state *st = s->private;
148         struct nf_conn_tstamp *tstamp;
149         s64 delta_time;
150 
151         tstamp = nf_conn_tstamp_find(ct);
152         if (tstamp) {
153                 delta_time = st->time_now - tstamp->start;
154                 if (delta_time > 0)
155                         delta_time = div_s64(delta_time, NSEC_PER_SEC);
156                 else
157                         delta_time = 0;
158 
159                 return seq_printf(s, "delta-time=%llu ",
160                                   (unsigned long long)delta_time);
161         }
162         return 0;
163 }
164 #else
165 static inline int
166 ct_show_delta_time(struct seq_file *s, const struct nf_conn *ct)
167 {
168         return 0;
169 }
170 #endif
171 
172 /* return 0 on success, 1 in case of error */
173 static int ct_seq_show(struct seq_file *s, void *v)
174 {
175         struct nf_conntrack_tuple_hash *hash = v;
176         struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(hash);
177         const struct nf_conntrack_l3proto *l3proto;
178         const struct nf_conntrack_l4proto *l4proto;
179         int ret = 0;
180 
181         NF_CT_ASSERT(ct);
182         if (unlikely(!atomic_inc_not_zero(&ct->ct_general.use)))
183                 return 0;
184 
185         /* we only want to print DIR_ORIGINAL */
186         if (NF_CT_DIRECTION(hash))
187                 goto release;
188 
189         l3proto = __nf_ct_l3proto_find(nf_ct_l3num(ct));
190         NF_CT_ASSERT(l3proto);
191         l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct));
192         NF_CT_ASSERT(l4proto);
193 
194         ret = -ENOSPC;
195         if (seq_printf(s, "%-8s %u %-8s %u %ld ",
196                        l3proto->name, nf_ct_l3num(ct),
197                        l4proto->name, nf_ct_protonum(ct),
198                        timer_pending(&ct->timeout)
199                        ? (long)(ct->timeout.expires - jiffies)/HZ : 0) != 0)
200                 goto release;
201 
202         if (l4proto->print_conntrack && l4proto->print_conntrack(s, ct))
203                 goto release;
204 
205         if (print_tuple(s, &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
206                         l3proto, l4proto))
207                 goto release;
208 
209         if (seq_print_acct(s, ct, IP_CT_DIR_ORIGINAL))
210                 goto release;
211 
212         if (!(test_bit(IPS_SEEN_REPLY_BIT, &ct->status)))
213                 if (seq_printf(s, "[UNREPLIED] "))
214                         goto release;
215 
216         if (print_tuple(s, &ct->tuplehash[IP_CT_DIR_REPLY].tuple,
217                         l3proto, l4proto))
218                 goto release;
219 
220         if (seq_print_acct(s, ct, IP_CT_DIR_REPLY))
221                 goto release;
222 
223         if (test_bit(IPS_ASSURED_BIT, &ct->status))
224                 if (seq_printf(s, "[ASSURED] "))
225                         goto release;
226 
227 #if defined(CONFIG_NF_CONNTRACK_MARK)
228         if (seq_printf(s, "mark=%u ", ct->mark))
229                 goto release;
230 #endif
231 
232         if (ct_show_secctx(s, ct))
233                 goto release;
234 
235 #ifdef CONFIG_NF_CONNTRACK_ZONES
236         if (seq_printf(s, "zone=%u ", nf_ct_zone(ct)))
237                 goto release;
238 #endif
239 
240         if (ct_show_delta_time(s, ct))
241                 goto release;
242 
243         if (seq_printf(s, "use=%u\n", atomic_read(&ct->ct_general.use)))
244                 goto release;
245 
246         ret = 0;
247 release:
248         nf_ct_put(ct);
249         return ret;
250 }
251 
252 static const struct seq_operations ct_seq_ops = {
253         .start = ct_seq_start,
254         .next  = ct_seq_next,
255         .stop  = ct_seq_stop,
256         .show  = ct_seq_show
257 };
258 
259 static int ct_open(struct inode *inode, struct file *file)
260 {
261         return seq_open_net(inode, file, &ct_seq_ops,
262                         sizeof(struct ct_iter_state));
263 }
264 
265 static const struct file_operations ct_file_ops = {
266         .owner   = THIS_MODULE,
267         .open    = ct_open,
268         .read    = seq_read,
269         .llseek  = seq_lseek,
270         .release = seq_release_net,
271 };
272 
273 static void *ct_cpu_seq_start(struct seq_file *seq, loff_t *pos)
274 {
275         struct net *net = seq_file_net(seq);
276         int cpu;
277 
278         if (*pos == 0)
279                 return SEQ_START_TOKEN;
280 
281         for (cpu = *pos-1; cpu < nr_cpu_ids; ++cpu) {
282                 if (!cpu_possible(cpu))
283                         continue;
284                 *pos = cpu + 1;
285                 return per_cpu_ptr(net->ct.stat, cpu);
286         }
287 
288         return NULL;
289 }
290 
291 static void *ct_cpu_seq_next(struct seq_file *seq, void *v, loff_t *pos)
292 {
293         struct net *net = seq_file_net(seq);
294         int cpu;
295 
296         for (cpu = *pos; cpu < nr_cpu_ids; ++cpu) {
297                 if (!cpu_possible(cpu))
298                         continue;
299                 *pos = cpu + 1;
300                 return per_cpu_ptr(net->ct.stat, cpu);
301         }
302 
303         return NULL;
304 }
305 
306 static void ct_cpu_seq_stop(struct seq_file *seq, void *v)
307 {
308 }
309 
310 static int ct_cpu_seq_show(struct seq_file *seq, void *v)
311 {
312         struct net *net = seq_file_net(seq);
313         unsigned int nr_conntracks = atomic_read(&net->ct.count);
314         const struct ip_conntrack_stat *st = v;
315 
316         if (v == SEQ_START_TOKEN) {
317                 seq_printf(seq, "entries  searched found new invalid ignore delete delete_list insert insert_failed drop early_drop icmp_error  expect_new expect_create expect_delete search_restart\n");
318                 return 0;
319         }
320 
321         seq_printf(seq, "%08x  %08x %08x %08x %08x %08x %08x %08x "
322                         "%08x %08x %08x %08x %08x  %08x %08x %08x %08x\n",
323                    nr_conntracks,
324                    st->searched,
325                    st->found,
326                    st->new,
327                    st->invalid,
328                    st->ignore,
329                    st->delete,
330                    st->delete_list,
331                    st->insert,
332                    st->insert_failed,
333                    st->drop,
334                    st->early_drop,
335                    st->error,
336 
337                    st->expect_new,
338                    st->expect_create,
339                    st->expect_delete,
340                    st->search_restart
341                 );
342         return 0;
343 }
344 
345 static const struct seq_operations ct_cpu_seq_ops = {
346         .start  = ct_cpu_seq_start,
347         .next   = ct_cpu_seq_next,
348         .stop   = ct_cpu_seq_stop,
349         .show   = ct_cpu_seq_show,
350 };
351 
352 static int ct_cpu_seq_open(struct inode *inode, struct file *file)
353 {
354         return seq_open_net(inode, file, &ct_cpu_seq_ops,
355                             sizeof(struct seq_net_private));
356 }
357 
358 static const struct file_operations ct_cpu_seq_fops = {
359         .owner   = THIS_MODULE,
360         .open    = ct_cpu_seq_open,
361         .read    = seq_read,
362         .llseek  = seq_lseek,
363         .release = seq_release_net,
364 };
365 
366 static int nf_conntrack_standalone_init_proc(struct net *net)
367 {
368         struct proc_dir_entry *pde;
369 
370         pde = proc_create("nf_conntrack", 0440, net->proc_net, &ct_file_ops);
371         if (!pde)
372                 goto out_nf_conntrack;
373 
374         pde = proc_create("nf_conntrack", S_IRUGO, net->proc_net_stat,
375                           &ct_cpu_seq_fops);
376         if (!pde)
377                 goto out_stat_nf_conntrack;
378         return 0;
379 
380 out_stat_nf_conntrack:
381         remove_proc_entry("nf_conntrack", net->proc_net);
382 out_nf_conntrack:
383         return -ENOMEM;
384 }
385 
386 static void nf_conntrack_standalone_fini_proc(struct net *net)
387 {
388         remove_proc_entry("nf_conntrack", net->proc_net_stat);
389         remove_proc_entry("nf_conntrack", net->proc_net);
390 }
391 #else
392 static int nf_conntrack_standalone_init_proc(struct net *net)
393 {
394         return 0;
395 }
396 
397 static void nf_conntrack_standalone_fini_proc(struct net *net)
398 {
399 }
400 #endif /* CONFIG_NF_CONNTRACK_PROCFS */
401 
402 /* Sysctl support */
403 
404 #ifdef CONFIG_SYSCTL
405 /* Log invalid packets of a given protocol */
406 static int log_invalid_proto_min = 0;
407 static int log_invalid_proto_max = 255;
408 
409 static struct ctl_table_header *nf_ct_netfilter_header;
410 
411 static struct ctl_table nf_ct_sysctl_table[] = {
412         {
413                 .procname       = "nf_conntrack_max",
414                 .data           = &nf_conntrack_max,
415                 .maxlen         = sizeof(int),
416                 .mode           = 0644,
417                 .proc_handler   = proc_dointvec,
418         },
419         {
420                 .procname       = "nf_conntrack_count",
421                 .data           = &init_net.ct.count,
422                 .maxlen         = sizeof(int),
423                 .mode           = 0444,
424                 .proc_handler   = proc_dointvec,
425         },
426         {
427                 .procname       = "nf_conntrack_buckets",
428                 .data           = &init_net.ct.htable_size,
429                 .maxlen         = sizeof(unsigned int),
430                 .mode           = 0444,
431                 .proc_handler   = proc_dointvec,
432         },
433         {
434                 .procname       = "nf_conntrack_checksum",
435                 .data           = &init_net.ct.sysctl_checksum,
436                 .maxlen         = sizeof(unsigned int),
437                 .mode           = 0644,
438                 .proc_handler   = proc_dointvec,
439         },
440         {
441                 .procname       = "nf_conntrack_log_invalid",
442                 .data           = &init_net.ct.sysctl_log_invalid,
443                 .maxlen         = sizeof(unsigned int),
444                 .mode           = 0644,
445                 .proc_handler   = proc_dointvec_minmax,
446                 .extra1         = &log_invalid_proto_min,
447                 .extra2         = &log_invalid_proto_max,
448         },
449         {
450                 .procname       = "nf_conntrack_expect_max",
451                 .data           = &nf_ct_expect_max,
452                 .maxlen         = sizeof(int),
453                 .mode           = 0644,
454                 .proc_handler   = proc_dointvec,
455         },
456         { }
457 };
458 
459 #define NET_NF_CONNTRACK_MAX 2089
460 
461 static struct ctl_table nf_ct_netfilter_table[] = {
462         {
463                 .procname       = "nf_conntrack_max",
464                 .data           = &nf_conntrack_max,
465                 .maxlen         = sizeof(int),
466                 .mode           = 0644,
467                 .proc_handler   = proc_dointvec,
468         },
469         { }
470 };
471 
472 static int nf_conntrack_standalone_init_sysctl(struct net *net)
473 {
474         struct ctl_table *table;
475 
476         table = kmemdup(nf_ct_sysctl_table, sizeof(nf_ct_sysctl_table),
477                         GFP_KERNEL);
478         if (!table)
479                 goto out_kmemdup;
480 
481         table[1].data = &net->ct.count;
482         table[2].data = &net->ct.htable_size;
483         table[3].data = &net->ct.sysctl_checksum;
484         table[4].data = &net->ct.sysctl_log_invalid;
485 
486         /* Don't export sysctls to unprivileged users */
487         if (net->user_ns != &init_user_ns)
488                 table[0].procname = NULL;
489 
490         net->ct.sysctl_header = register_net_sysctl(net, "net/netfilter", table);
491         if (!net->ct.sysctl_header)
492                 goto out_unregister_netfilter;
493 
494         return 0;
495 
496 out_unregister_netfilter:
497         kfree(table);
498 out_kmemdup:
499         return -ENOMEM;
500 }
501 
502 static void nf_conntrack_standalone_fini_sysctl(struct net *net)
503 {
504         struct ctl_table *table;
505 
506         table = net->ct.sysctl_header->ctl_table_arg;
507         unregister_net_sysctl_table(net->ct.sysctl_header);
508         kfree(table);
509 }
510 #else
511 static int nf_conntrack_standalone_init_sysctl(struct net *net)
512 {
513         return 0;
514 }
515 
516 static void nf_conntrack_standalone_fini_sysctl(struct net *net)
517 {
518 }
519 #endif /* CONFIG_SYSCTL */
520 
521 static int nf_conntrack_pernet_init(struct net *net)
522 {
523         int ret;
524 
525         ret = nf_conntrack_init_net(net);
526         if (ret < 0)
527                 goto out_init;
528 
529         ret = nf_conntrack_standalone_init_proc(net);
530         if (ret < 0)
531                 goto out_proc;
532 
533         net->ct.sysctl_checksum = 1;
534         net->ct.sysctl_log_invalid = 0;
535         ret = nf_conntrack_standalone_init_sysctl(net);
536         if (ret < 0)
537                 goto out_sysctl;
538 
539         return 0;
540 
541 out_sysctl:
542         nf_conntrack_standalone_fini_proc(net);
543 out_proc:
544         nf_conntrack_cleanup_net(net);
545 out_init:
546         return ret;
547 }
548 
549 static void nf_conntrack_pernet_exit(struct list_head *net_exit_list)
550 {
551         struct net *net;
552 
553         list_for_each_entry(net, net_exit_list, exit_list) {
554                 nf_conntrack_standalone_fini_sysctl(net);
555                 nf_conntrack_standalone_fini_proc(net);
556         }
557         nf_conntrack_cleanup_net_list(net_exit_list);
558 }
559 
560 static struct pernet_operations nf_conntrack_net_ops = {
561         .init           = nf_conntrack_pernet_init,
562         .exit_batch     = nf_conntrack_pernet_exit,
563 };
564 
565 static int __init nf_conntrack_standalone_init(void)
566 {
567         int ret = nf_conntrack_init_start();
568         if (ret < 0)
569                 goto out_start;
570 
571 #ifdef CONFIG_SYSCTL
572         nf_ct_netfilter_header =
573                 register_net_sysctl(&init_net, "net", nf_ct_netfilter_table);
574         if (!nf_ct_netfilter_header) {
575                 pr_err("nf_conntrack: can't register to sysctl.\n");
576                 ret = -ENOMEM;
577                 goto out_sysctl;
578         }
579 #endif
580 
581         ret = register_pernet_subsys(&nf_conntrack_net_ops);
582         if (ret < 0)
583                 goto out_pernet;
584 
585         nf_conntrack_init_end();
586         return 0;
587 
588 out_pernet:
589 #ifdef CONFIG_SYSCTL
590         unregister_net_sysctl_table(nf_ct_netfilter_header);
591 out_sysctl:
592 #endif
593         nf_conntrack_cleanup_end();
594 out_start:
595         return ret;
596 }
597 
598 static void __exit nf_conntrack_standalone_fini(void)
599 {
600         nf_conntrack_cleanup_start();
601         unregister_pernet_subsys(&nf_conntrack_net_ops);
602 #ifdef CONFIG_SYSCTL
603         unregister_net_sysctl_table(nf_ct_netfilter_header);
604 #endif
605         nf_conntrack_cleanup_end();
606 }
607 
608 module_init(nf_conntrack_standalone_init);
609 module_exit(nf_conntrack_standalone_fini);
610 
611 /* Some modules need us, but don't depend directly on any symbol.
612    They should call this. */
613 void need_conntrack(void)
614 {
615 }
616 EXPORT_SYMBOL_GPL(need_conntrack);
617 

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