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ip6_flowlabel.c
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1 /*
2  * ip6_flowlabel.c IPv6 flowlabel manager.
3  *
4  * This program is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU General Public License
6  * as published by the Free Software Foundation; either version
7  * 2 of the License, or (at your option) any later version.
8  *
9  * Authors: Alexey Kuznetsov, <[email protected]>
10  */
11 
12 #include <linux/capability.h>
13 #include <linux/errno.h>
14 #include <linux/types.h>
15 #include <linux/socket.h>
16 #include <linux/net.h>
17 #include <linux/netdevice.h>
18 #include <linux/if_arp.h>
19 #include <linux/in6.h>
20 #include <linux/route.h>
21 #include <linux/proc_fs.h>
22 #include <linux/seq_file.h>
23 #include <linux/slab.h>
24 #include <linux/export.h>
25 #include <linux/pid_namespace.h>
26 
27 #include <net/net_namespace.h>
28 #include <net/sock.h>
29 
30 #include <net/ipv6.h>
31 #include <net/ndisc.h>
32 #include <net/protocol.h>
33 #include <net/ip6_route.h>
34 #include <net/addrconf.h>
35 #include <net/rawv6.h>
36 #include <net/icmp.h>
37 #include <net/transp_v6.h>
38 
39 #include <asm/uaccess.h>
40 
41 #define FL_MIN_LINGER 6 /* Minimal linger. It is set to 6sec specified
42  in old IPv6 RFC. Well, it was reasonable value.
43  */
44 #define FL_MAX_LINGER 60 /* Maximal linger timeout */
45 
46 /* FL hash table */
47 
48 #define FL_MAX_PER_SOCK 32
49 #define FL_MAX_SIZE 4096
50 #define FL_HASH_MASK 255
51 #define FL_HASH(l) (ntohl(l)&FL_HASH_MASK)
52 
53 static atomic_t fl_size = ATOMIC_INIT(0);
54 static struct ip6_flowlabel *fl_ht[FL_HASH_MASK+1];
55 
56 static void ip6_fl_gc(unsigned long dummy);
57 static DEFINE_TIMER(ip6_fl_gc_timer, ip6_fl_gc, 0, 0);
58 
59 /* FL hash table lock: it protects only of GC */
60 
61 static DEFINE_RWLOCK(ip6_fl_lock);
62 
63 /* Big socket sock */
64 
65 static DEFINE_RWLOCK(ip6_sk_fl_lock);
66 
67 
68 static inline struct ip6_flowlabel *__fl_lookup(struct net *net, __be32 label)
69 {
70  struct ip6_flowlabel *fl;
71 
72  for (fl=fl_ht[FL_HASH(label)]; fl; fl = fl->next) {
73  if (fl->label == label && net_eq(fl->fl_net, net))
74  return fl;
75  }
76  return NULL;
77 }
78 
79 static struct ip6_flowlabel *fl_lookup(struct net *net, __be32 label)
80 {
81  struct ip6_flowlabel *fl;
82 
83  read_lock_bh(&ip6_fl_lock);
84  fl = __fl_lookup(net, label);
85  if (fl)
86  atomic_inc(&fl->users);
87  read_unlock_bh(&ip6_fl_lock);
88  return fl;
89 }
90 
91 
92 static void fl_free(struct ip6_flowlabel *fl)
93 {
94  if (fl) {
95  if (fl->share == IPV6_FL_S_PROCESS)
96  put_pid(fl->owner.pid);
97  release_net(fl->fl_net);
98  kfree(fl->opt);
99  }
100  kfree(fl);
101 }
102 
103 static void fl_release(struct ip6_flowlabel *fl)
104 {
105  write_lock_bh(&ip6_fl_lock);
106 
107  fl->lastuse = jiffies;
108  if (atomic_dec_and_test(&fl->users)) {
109  unsigned long ttd = fl->lastuse + fl->linger;
110  if (time_after(ttd, fl->expires))
111  fl->expires = ttd;
112  ttd = fl->expires;
113  if (fl->opt && fl->share == IPV6_FL_S_EXCL) {
114  struct ipv6_txoptions *opt = fl->opt;
115  fl->opt = NULL;
116  kfree(opt);
117  }
118  if (!timer_pending(&ip6_fl_gc_timer) ||
119  time_after(ip6_fl_gc_timer.expires, ttd))
120  mod_timer(&ip6_fl_gc_timer, ttd);
121  }
122  write_unlock_bh(&ip6_fl_lock);
123 }
124 
125 static void ip6_fl_gc(unsigned long dummy)
126 {
127  int i;
128  unsigned long now = jiffies;
129  unsigned long sched = 0;
130 
131  write_lock(&ip6_fl_lock);
132 
133  for (i=0; i<=FL_HASH_MASK; i++) {
134  struct ip6_flowlabel *fl, **flp;
135  flp = &fl_ht[i];
136  while ((fl=*flp) != NULL) {
137  if (atomic_read(&fl->users) == 0) {
138  unsigned long ttd = fl->lastuse + fl->linger;
139  if (time_after(ttd, fl->expires))
140  fl->expires = ttd;
141  ttd = fl->expires;
142  if (time_after_eq(now, ttd)) {
143  *flp = fl->next;
144  fl_free(fl);
145  atomic_dec(&fl_size);
146  continue;
147  }
148  if (!sched || time_before(ttd, sched))
149  sched = ttd;
150  }
151  flp = &fl->next;
152  }
153  }
154  if (!sched && atomic_read(&fl_size))
155  sched = now + FL_MAX_LINGER;
156  if (sched) {
157  mod_timer(&ip6_fl_gc_timer, sched);
158  }
159  write_unlock(&ip6_fl_lock);
160 }
161 
162 static void __net_exit ip6_fl_purge(struct net *net)
163 {
164  int i;
165 
166  write_lock(&ip6_fl_lock);
167  for (i = 0; i <= FL_HASH_MASK; i++) {
168  struct ip6_flowlabel *fl, **flp;
169  flp = &fl_ht[i];
170  while ((fl = *flp) != NULL) {
171  if (net_eq(fl->fl_net, net) &&
172  atomic_read(&fl->users) == 0) {
173  *flp = fl->next;
174  fl_free(fl);
175  atomic_dec(&fl_size);
176  continue;
177  }
178  flp = &fl->next;
179  }
180  }
181  write_unlock(&ip6_fl_lock);
182 }
183 
184 static struct ip6_flowlabel *fl_intern(struct net *net,
185  struct ip6_flowlabel *fl, __be32 label)
186 {
187  struct ip6_flowlabel *lfl;
188 
189  fl->label = label & IPV6_FLOWLABEL_MASK;
190 
191  write_lock_bh(&ip6_fl_lock);
192  if (label == 0) {
193  for (;;) {
194  fl->label = htonl(net_random())&IPV6_FLOWLABEL_MASK;
195  if (fl->label) {
196  lfl = __fl_lookup(net, fl->label);
197  if (lfl == NULL)
198  break;
199  }
200  }
201  } else {
202  /*
203  * we dropper the ip6_fl_lock, so this entry could reappear
204  * and we need to recheck with it.
205  *
206  * OTOH no need to search the active socket first, like it is
207  * done in ipv6_flowlabel_opt - sock is locked, so new entry
208  * with the same label can only appear on another sock
209  */
210  lfl = __fl_lookup(net, fl->label);
211  if (lfl != NULL) {
212  atomic_inc(&lfl->users);
213  write_unlock_bh(&ip6_fl_lock);
214  return lfl;
215  }
216  }
217 
218  fl->lastuse = jiffies;
219  fl->next = fl_ht[FL_HASH(fl->label)];
220  fl_ht[FL_HASH(fl->label)] = fl;
221  atomic_inc(&fl_size);
222  write_unlock_bh(&ip6_fl_lock);
223  return NULL;
224 }
225 
226 
227 
228 /* Socket flowlabel lists */
229 
230 struct ip6_flowlabel * fl6_sock_lookup(struct sock *sk, __be32 label)
231 {
232  struct ipv6_fl_socklist *sfl;
233  struct ipv6_pinfo *np = inet6_sk(sk);
234 
235  label &= IPV6_FLOWLABEL_MASK;
236 
237  read_lock_bh(&ip6_sk_fl_lock);
238  for (sfl=np->ipv6_fl_list; sfl; sfl = sfl->next) {
239  struct ip6_flowlabel *fl = sfl->fl;
240  if (fl->label == label) {
241  fl->lastuse = jiffies;
242  atomic_inc(&fl->users);
243  read_unlock_bh(&ip6_sk_fl_lock);
244  return fl;
245  }
246  }
247  read_unlock_bh(&ip6_sk_fl_lock);
248  return NULL;
249 }
250 
251 EXPORT_SYMBOL_GPL(fl6_sock_lookup);
252 
253 void fl6_free_socklist(struct sock *sk)
254 {
255  struct ipv6_pinfo *np = inet6_sk(sk);
256  struct ipv6_fl_socklist *sfl;
257 
258  while ((sfl = np->ipv6_fl_list) != NULL) {
259  np->ipv6_fl_list = sfl->next;
260  fl_release(sfl->fl);
261  kfree(sfl);
262  }
263 }
264 
265 /* Service routines */
266 
267 
268 /*
269  It is the only difficult place. flowlabel enforces equal headers
270  before and including routing header, however user may supply options
271  following rthdr.
272  */
273 
274 struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions * opt_space,
275  struct ip6_flowlabel * fl,
276  struct ipv6_txoptions * fopt)
277 {
278  struct ipv6_txoptions * fl_opt = fl->opt;
279 
280  if (fopt == NULL || fopt->opt_flen == 0)
281  return fl_opt;
282 
283  if (fl_opt != NULL) {
284  opt_space->hopopt = fl_opt->hopopt;
285  opt_space->dst0opt = fl_opt->dst0opt;
286  opt_space->srcrt = fl_opt->srcrt;
287  opt_space->opt_nflen = fl_opt->opt_nflen;
288  } else {
289  if (fopt->opt_nflen == 0)
290  return fopt;
291  opt_space->hopopt = NULL;
292  opt_space->dst0opt = NULL;
293  opt_space->srcrt = NULL;
294  opt_space->opt_nflen = 0;
295  }
296  opt_space->dst1opt = fopt->dst1opt;
297  opt_space->opt_flen = fopt->opt_flen;
298  return opt_space;
299 }
300 EXPORT_SYMBOL_GPL(fl6_merge_options);
301 
302 static unsigned long check_linger(unsigned long ttl)
303 {
304  if (ttl < FL_MIN_LINGER)
305  return FL_MIN_LINGER*HZ;
306  if (ttl > FL_MAX_LINGER && !capable(CAP_NET_ADMIN))
307  return 0;
308  return ttl*HZ;
309 }
310 
311 static int fl6_renew(struct ip6_flowlabel *fl, unsigned long linger, unsigned long expires)
312 {
313  linger = check_linger(linger);
314  if (!linger)
315  return -EPERM;
316  expires = check_linger(expires);
317  if (!expires)
318  return -EPERM;
319  fl->lastuse = jiffies;
320  if (time_before(fl->linger, linger))
321  fl->linger = linger;
322  if (time_before(expires, fl->linger))
323  expires = fl->linger;
324  if (time_before(fl->expires, fl->lastuse + expires))
325  fl->expires = fl->lastuse + expires;
326  return 0;
327 }
328 
329 static struct ip6_flowlabel *
330 fl_create(struct net *net, struct sock *sk, struct in6_flowlabel_req *freq,
331  char __user *optval, int optlen, int *err_p)
332 {
333  struct ip6_flowlabel *fl = NULL;
334  int olen;
335  int addr_type;
336  int err;
337 
338  olen = optlen - CMSG_ALIGN(sizeof(*freq));
339  err = -EINVAL;
340  if (olen > 64 * 1024)
341  goto done;
342 
343  err = -ENOMEM;
344  fl = kzalloc(sizeof(*fl), GFP_KERNEL);
345  if (fl == NULL)
346  goto done;
347 
348  if (olen > 0) {
349  struct msghdr msg;
350  struct flowi6 flowi6;
351  int junk;
352 
353  err = -ENOMEM;
354  fl->opt = kmalloc(sizeof(*fl->opt) + olen, GFP_KERNEL);
355  if (fl->opt == NULL)
356  goto done;
357 
358  memset(fl->opt, 0, sizeof(*fl->opt));
359  fl->opt->tot_len = sizeof(*fl->opt) + olen;
360  err = -EFAULT;
361  if (copy_from_user(fl->opt+1, optval+CMSG_ALIGN(sizeof(*freq)), olen))
362  goto done;
363 
364  msg.msg_controllen = olen;
365  msg.msg_control = (void*)(fl->opt+1);
366  memset(&flowi6, 0, sizeof(flowi6));
367 
368  err = datagram_send_ctl(net, sk, &msg, &flowi6, fl->opt, &junk,
369  &junk, &junk);
370  if (err)
371  goto done;
372  err = -EINVAL;
373  if (fl->opt->opt_flen)
374  goto done;
375  if (fl->opt->opt_nflen == 0) {
376  kfree(fl->opt);
377  fl->opt = NULL;
378  }
379  }
380 
381  fl->fl_net = hold_net(net);
382  fl->expires = jiffies;
383  err = fl6_renew(fl, freq->flr_linger, freq->flr_expires);
384  if (err)
385  goto done;
386  fl->share = freq->flr_share;
387  addr_type = ipv6_addr_type(&freq->flr_dst);
388  if ((addr_type & IPV6_ADDR_MAPPED) ||
389  addr_type == IPV6_ADDR_ANY) {
390  err = -EINVAL;
391  goto done;
392  }
393  fl->dst = freq->flr_dst;
394  atomic_set(&fl->users, 1);
395  switch (fl->share) {
396  case IPV6_FL_S_EXCL:
397  case IPV6_FL_S_ANY:
398  break;
399  case IPV6_FL_S_PROCESS:
400  fl->owner.pid = get_task_pid(current, PIDTYPE_PID);
401  break;
402  case IPV6_FL_S_USER:
403  fl->owner.uid = current_euid();
404  break;
405  default:
406  err = -EINVAL;
407  goto done;
408  }
409  return fl;
410 
411 done:
412  fl_free(fl);
413  *err_p = err;
414  return NULL;
415 }
416 
417 static int mem_check(struct sock *sk)
418 {
419  struct ipv6_pinfo *np = inet6_sk(sk);
420  struct ipv6_fl_socklist *sfl;
421  int room = FL_MAX_SIZE - atomic_read(&fl_size);
422  int count = 0;
423 
424  if (room > FL_MAX_SIZE - FL_MAX_PER_SOCK)
425  return 0;
426 
427  for (sfl = np->ipv6_fl_list; sfl; sfl = sfl->next)
428  count++;
429 
430  if (room <= 0 ||
431  ((count >= FL_MAX_PER_SOCK ||
432  (count > 0 && room < FL_MAX_SIZE/2) || room < FL_MAX_SIZE/4) &&
433  !capable(CAP_NET_ADMIN)))
434  return -ENOBUFS;
435 
436  return 0;
437 }
438 
439 static bool ipv6_hdr_cmp(struct ipv6_opt_hdr *h1, struct ipv6_opt_hdr *h2)
440 {
441  if (h1 == h2)
442  return false;
443  if (h1 == NULL || h2 == NULL)
444  return true;
445  if (h1->hdrlen != h2->hdrlen)
446  return true;
447  return memcmp(h1+1, h2+1, ((h1->hdrlen+1)<<3) - sizeof(*h1));
448 }
449 
450 static bool ipv6_opt_cmp(struct ipv6_txoptions *o1, struct ipv6_txoptions *o2)
451 {
452  if (o1 == o2)
453  return false;
454  if (o1 == NULL || o2 == NULL)
455  return true;
456  if (o1->opt_nflen != o2->opt_nflen)
457  return true;
458  if (ipv6_hdr_cmp(o1->hopopt, o2->hopopt))
459  return true;
460  if (ipv6_hdr_cmp(o1->dst0opt, o2->dst0opt))
461  return true;
462  if (ipv6_hdr_cmp((struct ipv6_opt_hdr *)o1->srcrt, (struct ipv6_opt_hdr *)o2->srcrt))
463  return true;
464  return false;
465 }
466 
467 static inline void fl_link(struct ipv6_pinfo *np, struct ipv6_fl_socklist *sfl,
468  struct ip6_flowlabel *fl)
469 {
470  write_lock_bh(&ip6_sk_fl_lock);
471  sfl->fl = fl;
472  sfl->next = np->ipv6_fl_list;
473  np->ipv6_fl_list = sfl;
474  write_unlock_bh(&ip6_sk_fl_lock);
475 }
476 
477 int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen)
478 {
479  int uninitialized_var(err);
480  struct net *net = sock_net(sk);
481  struct ipv6_pinfo *np = inet6_sk(sk);
482  struct in6_flowlabel_req freq;
483  struct ipv6_fl_socklist *sfl1=NULL;
484  struct ipv6_fl_socklist *sfl, **sflp;
485  struct ip6_flowlabel *fl, *fl1 = NULL;
486 
487 
488  if (optlen < sizeof(freq))
489  return -EINVAL;
490 
491  if (copy_from_user(&freq, optval, sizeof(freq)))
492  return -EFAULT;
493 
494  switch (freq.flr_action) {
495  case IPV6_FL_A_PUT:
496  write_lock_bh(&ip6_sk_fl_lock);
497  for (sflp = &np->ipv6_fl_list; (sfl=*sflp)!=NULL; sflp = &sfl->next) {
498  if (sfl->fl->label == freq.flr_label) {
499  if (freq.flr_label == (np->flow_label&IPV6_FLOWLABEL_MASK))
500  np->flow_label &= ~IPV6_FLOWLABEL_MASK;
501  *sflp = sfl->next;
502  write_unlock_bh(&ip6_sk_fl_lock);
503  fl_release(sfl->fl);
504  kfree(sfl);
505  return 0;
506  }
507  }
508  write_unlock_bh(&ip6_sk_fl_lock);
509  return -ESRCH;
510 
511  case IPV6_FL_A_RENEW:
512  read_lock_bh(&ip6_sk_fl_lock);
513  for (sfl = np->ipv6_fl_list; sfl; sfl = sfl->next) {
514  if (sfl->fl->label == freq.flr_label) {
515  err = fl6_renew(sfl->fl, freq.flr_linger, freq.flr_expires);
516  read_unlock_bh(&ip6_sk_fl_lock);
517  return err;
518  }
519  }
520  read_unlock_bh(&ip6_sk_fl_lock);
521 
522  if (freq.flr_share == IPV6_FL_S_NONE && capable(CAP_NET_ADMIN)) {
523  fl = fl_lookup(net, freq.flr_label);
524  if (fl) {
525  err = fl6_renew(fl, freq.flr_linger, freq.flr_expires);
526  fl_release(fl);
527  return err;
528  }
529  }
530  return -ESRCH;
531 
532  case IPV6_FL_A_GET:
533  if (freq.flr_label & ~IPV6_FLOWLABEL_MASK)
534  return -EINVAL;
535 
536  fl = fl_create(net, sk, &freq, optval, optlen, &err);
537  if (fl == NULL)
538  return err;
539  sfl1 = kmalloc(sizeof(*sfl1), GFP_KERNEL);
540 
541  if (freq.flr_label) {
542  err = -EEXIST;
543  read_lock_bh(&ip6_sk_fl_lock);
544  for (sfl = np->ipv6_fl_list; sfl; sfl = sfl->next) {
545  if (sfl->fl->label == freq.flr_label) {
546  if (freq.flr_flags&IPV6_FL_F_EXCL) {
547  read_unlock_bh(&ip6_sk_fl_lock);
548  goto done;
549  }
550  fl1 = sfl->fl;
551  atomic_inc(&fl1->users);
552  break;
553  }
554  }
555  read_unlock_bh(&ip6_sk_fl_lock);
556 
557  if (fl1 == NULL)
558  fl1 = fl_lookup(net, freq.flr_label);
559  if (fl1) {
560 recheck:
561  err = -EEXIST;
562  if (freq.flr_flags&IPV6_FL_F_EXCL)
563  goto release;
564  err = -EPERM;
565  if (fl1->share == IPV6_FL_S_EXCL ||
566  fl1->share != fl->share ||
567  ((fl1->share == IPV6_FL_S_PROCESS) &&
568  (fl1->owner.pid == fl->owner.pid)) ||
569  ((fl1->share == IPV6_FL_S_USER) &&
570  uid_eq(fl1->owner.uid, fl->owner.uid)))
571  goto release;
572 
573  err = -EINVAL;
574  if (!ipv6_addr_equal(&fl1->dst, &fl->dst) ||
575  ipv6_opt_cmp(fl1->opt, fl->opt))
576  goto release;
577 
578  err = -ENOMEM;
579  if (sfl1 == NULL)
580  goto release;
581  if (fl->linger > fl1->linger)
582  fl1->linger = fl->linger;
583  if ((long)(fl->expires - fl1->expires) > 0)
584  fl1->expires = fl->expires;
585  fl_link(np, sfl1, fl1);
586  fl_free(fl);
587  return 0;
588 
589 release:
590  fl_release(fl1);
591  goto done;
592  }
593  }
594  err = -ENOENT;
595  if (!(freq.flr_flags&IPV6_FL_F_CREATE))
596  goto done;
597 
598  err = -ENOMEM;
599  if (sfl1 == NULL || (err = mem_check(sk)) != 0)
600  goto done;
601 
602  fl1 = fl_intern(net, fl, freq.flr_label);
603  if (fl1 != NULL)
604  goto recheck;
605 
606  if (!freq.flr_label) {
607  if (copy_to_user(&((struct in6_flowlabel_req __user *) optval)->flr_label,
608  &fl->label, sizeof(fl->label))) {
609  /* Intentionally ignore fault. */
610  }
611  }
612 
613  fl_link(np, sfl1, fl);
614  return 0;
615 
616  default:
617  return -EINVAL;
618  }
619 
620 done:
621  fl_free(fl);
622  kfree(sfl1);
623  return err;
624 }
625 
626 #ifdef CONFIG_PROC_FS
627 
628 struct ip6fl_iter_state {
629  struct seq_net_private p;
630  struct pid_namespace *pid_ns;
631  int bucket;
632 };
633 
634 #define ip6fl_seq_private(seq) ((struct ip6fl_iter_state *)(seq)->private)
635 
636 static struct ip6_flowlabel *ip6fl_get_first(struct seq_file *seq)
637 {
638  struct ip6_flowlabel *fl = NULL;
639  struct ip6fl_iter_state *state = ip6fl_seq_private(seq);
640  struct net *net = seq_file_net(seq);
641 
642  for (state->bucket = 0; state->bucket <= FL_HASH_MASK; ++state->bucket) {
643  fl = fl_ht[state->bucket];
644 
645  while (fl && !net_eq(fl->fl_net, net))
646  fl = fl->next;
647  if (fl)
648  break;
649  }
650  return fl;
651 }
652 
653 static struct ip6_flowlabel *ip6fl_get_next(struct seq_file *seq, struct ip6_flowlabel *fl)
654 {
655  struct ip6fl_iter_state *state = ip6fl_seq_private(seq);
656  struct net *net = seq_file_net(seq);
657 
658  fl = fl->next;
659 try_again:
660  while (fl && !net_eq(fl->fl_net, net))
661  fl = fl->next;
662 
663  while (!fl) {
664  if (++state->bucket <= FL_HASH_MASK) {
665  fl = fl_ht[state->bucket];
666  goto try_again;
667  } else
668  break;
669  }
670  return fl;
671 }
672 
673 static struct ip6_flowlabel *ip6fl_get_idx(struct seq_file *seq, loff_t pos)
674 {
675  struct ip6_flowlabel *fl = ip6fl_get_first(seq);
676  if (fl)
677  while (pos && (fl = ip6fl_get_next(seq, fl)) != NULL)
678  --pos;
679  return pos ? NULL : fl;
680 }
681 
682 static void *ip6fl_seq_start(struct seq_file *seq, loff_t *pos)
683  __acquires(ip6_fl_lock)
684 {
685  read_lock_bh(&ip6_fl_lock);
686  return *pos ? ip6fl_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
687 }
688 
689 static void *ip6fl_seq_next(struct seq_file *seq, void *v, loff_t *pos)
690 {
691  struct ip6_flowlabel *fl;
692 
693  if (v == SEQ_START_TOKEN)
694  fl = ip6fl_get_first(seq);
695  else
696  fl = ip6fl_get_next(seq, v);
697  ++*pos;
698  return fl;
699 }
700 
701 static void ip6fl_seq_stop(struct seq_file *seq, void *v)
702  __releases(ip6_fl_lock)
703 {
704  read_unlock_bh(&ip6_fl_lock);
705 }
706 
707 static int ip6fl_seq_show(struct seq_file *seq, void *v)
708 {
709  struct ip6fl_iter_state *state = ip6fl_seq_private(seq);
710  if (v == SEQ_START_TOKEN)
711  seq_printf(seq, "%-5s %-1s %-6s %-6s %-6s %-8s %-32s %s\n",
712  "Label", "S", "Owner", "Users", "Linger", "Expires", "Dst", "Opt");
713  else {
714  struct ip6_flowlabel *fl = v;
715  seq_printf(seq,
716  "%05X %-1d %-6d %-6d %-6ld %-8ld %pi6 %-4d\n",
717  (unsigned int)ntohl(fl->label),
718  fl->share,
719  ((fl->share == IPV6_FL_S_PROCESS) ?
720  pid_nr_ns(fl->owner.pid, state->pid_ns) :
721  ((fl->share == IPV6_FL_S_USER) ?
722  from_kuid_munged(seq_user_ns(seq), fl->owner.uid) :
723  0)),
724  atomic_read(&fl->users),
725  fl->linger/HZ,
726  (long)(fl->expires - jiffies)/HZ,
727  &fl->dst,
728  fl->opt ? fl->opt->opt_nflen : 0);
729  }
730  return 0;
731 }
732 
733 static const struct seq_operations ip6fl_seq_ops = {
734  .start = ip6fl_seq_start,
735  .next = ip6fl_seq_next,
736  .stop = ip6fl_seq_stop,
737  .show = ip6fl_seq_show,
738 };
739 
740 static int ip6fl_seq_open(struct inode *inode, struct file *file)
741 {
742  struct seq_file *seq;
743  struct ip6fl_iter_state *state;
744  int err;
745 
746  err = seq_open_net(inode, file, &ip6fl_seq_ops,
747  sizeof(struct ip6fl_iter_state));
748 
749  if (!err) {
750  seq = file->private_data;
751  state = ip6fl_seq_private(seq);
752  rcu_read_lock();
753  state->pid_ns = get_pid_ns(task_active_pid_ns(current));
754  rcu_read_unlock();
755  }
756  return err;
757 }
758 
759 static int ip6fl_seq_release(struct inode *inode, struct file *file)
760 {
761  struct seq_file *seq = file->private_data;
762  struct ip6fl_iter_state *state = ip6fl_seq_private(seq);
763  put_pid_ns(state->pid_ns);
764  return seq_release_net(inode, file);
765 }
766 
767 static const struct file_operations ip6fl_seq_fops = {
768  .owner = THIS_MODULE,
769  .open = ip6fl_seq_open,
770  .read = seq_read,
771  .llseek = seq_lseek,
772  .release = ip6fl_seq_release,
773 };
774 
775 static int __net_init ip6_flowlabel_proc_init(struct net *net)
776 {
777  if (!proc_net_fops_create(net, "ip6_flowlabel",
778  S_IRUGO, &ip6fl_seq_fops))
779  return -ENOMEM;
780  return 0;
781 }
782 
783 static void __net_exit ip6_flowlabel_proc_fini(struct net *net)
784 {
785  proc_net_remove(net, "ip6_flowlabel");
786 }
787 #else
788 static inline int ip6_flowlabel_proc_init(struct net *net)
789 {
790  return 0;
791 }
792 static inline void ip6_flowlabel_proc_fini(struct net *net)
793 {
794 }
795 #endif
796 
797 static void __net_exit ip6_flowlabel_net_exit(struct net *net)
798 {
799  ip6_fl_purge(net);
800  ip6_flowlabel_proc_fini(net);
801 }
802 
803 static struct pernet_operations ip6_flowlabel_net_ops = {
804  .init = ip6_flowlabel_proc_init,
805  .exit = ip6_flowlabel_net_exit,
806 };
807 
808 int ip6_flowlabel_init(void)
809 {
810  return register_pernet_subsys(&ip6_flowlabel_net_ops);
811 }
812 
813 void ip6_flowlabel_cleanup(void)
814 {
815  del_timer(&ip6_fl_gc_timer);
816  unregister_pernet_subsys(&ip6_flowlabel_net_ops);
817 }
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