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Merge tag 'ktest-v3.9' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux...
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / net / ipv6 / ip6_flowlabel.c
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, <kuznet@ms2.inr.ac.ru>
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 __rcu *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_SPINLOCK(ip6_fl_lock);
62
63 /* Big socket sock */
64
65 static DEFINE_SPINLOCK(ip6_sk_fl_lock);
66
67 #define for_each_fl_rcu(hash, fl) \
68 for (fl = rcu_dereference_bh(fl_ht[(hash)]); \
69 fl != NULL; \
70 fl = rcu_dereference_bh(fl->next))
71 #define for_each_fl_continue_rcu(fl) \
72 for (fl = rcu_dereference_bh(fl->next); \
73 fl != NULL; \
74 fl = rcu_dereference_bh(fl->next))
75
76 #define for_each_sk_fl_rcu(np, sfl) \
77 for (sfl = rcu_dereference_bh(np->ipv6_fl_list); \
78 sfl != NULL; \
79 sfl = rcu_dereference_bh(sfl->next))
80
81 static inline struct ip6_flowlabel *__fl_lookup(struct net *net, __be32 label)
82 {
83 struct ip6_flowlabel *fl;
84
85 for_each_fl_rcu(FL_HASH(label), fl) {
86 if (fl->label == label && net_eq(fl->fl_net, net))
87 return fl;
88 }
89 return NULL;
90 }
91
92 static struct ip6_flowlabel *fl_lookup(struct net *net, __be32 label)
93 {
94 struct ip6_flowlabel *fl;
95
96 rcu_read_lock_bh();
97 fl = __fl_lookup(net, label);
98 if (fl && !atomic_inc_not_zero(&fl->users))
99 fl = NULL;
100 rcu_read_unlock_bh();
101 return fl;
102 }
103
104
105 static void fl_free(struct ip6_flowlabel *fl)
106 {
107 if (fl) {
108 if (fl->share == IPV6_FL_S_PROCESS)
109 put_pid(fl->owner.pid);
110 release_net(fl->fl_net);
111 kfree(fl->opt);
112 kfree_rcu(fl, rcu);
113 }
114 }
115
116 static void fl_release(struct ip6_flowlabel *fl)
117 {
118 spin_lock_bh(&ip6_fl_lock);
119
120 fl->lastuse = jiffies;
121 if (atomic_dec_and_test(&fl->users)) {
122 unsigned long ttd = fl->lastuse + fl->linger;
123 if (time_after(ttd, fl->expires))
124 fl->expires = ttd;
125 ttd = fl->expires;
126 if (fl->opt && fl->share == IPV6_FL_S_EXCL) {
127 struct ipv6_txoptions *opt = fl->opt;
128 fl->opt = NULL;
129 kfree(opt);
130 }
131 if (!timer_pending(&ip6_fl_gc_timer) ||
132 time_after(ip6_fl_gc_timer.expires, ttd))
133 mod_timer(&ip6_fl_gc_timer, ttd);
134 }
135 spin_unlock_bh(&ip6_fl_lock);
136 }
137
138 static void ip6_fl_gc(unsigned long dummy)
139 {
140 int i;
141 unsigned long now = jiffies;
142 unsigned long sched = 0;
143
144 spin_lock(&ip6_fl_lock);
145
146 for (i=0; i<=FL_HASH_MASK; i++) {
147 struct ip6_flowlabel *fl, **flp;
148 flp = &fl_ht[i];
149 while ((fl = rcu_dereference_protected(*flp,
150 lockdep_is_held(&ip6_fl_lock))) != NULL) {
151 if (atomic_read(&fl->users) == 0) {
152 unsigned long ttd = fl->lastuse + fl->linger;
153 if (time_after(ttd, fl->expires))
154 fl->expires = ttd;
155 ttd = fl->expires;
156 if (time_after_eq(now, ttd)) {
157 *flp = fl->next;
158 fl_free(fl);
159 atomic_dec(&fl_size);
160 continue;
161 }
162 if (!sched || time_before(ttd, sched))
163 sched = ttd;
164 }
165 flp = &fl->next;
166 }
167 }
168 if (!sched && atomic_read(&fl_size))
169 sched = now + FL_MAX_LINGER;
170 if (sched) {
171 mod_timer(&ip6_fl_gc_timer, sched);
172 }
173 spin_unlock(&ip6_fl_lock);
174 }
175
176 static void __net_exit ip6_fl_purge(struct net *net)
177 {
178 int i;
179
180 spin_lock(&ip6_fl_lock);
181 for (i = 0; i <= FL_HASH_MASK; i++) {
182 struct ip6_flowlabel *fl, **flp;
183 flp = &fl_ht[i];
184 while ((fl = rcu_dereference_protected(*flp,
185 lockdep_is_held(&ip6_fl_lock))) != NULL) {
186 if (net_eq(fl->fl_net, net) &&
187 atomic_read(&fl->users) == 0) {
188 *flp = fl->next;
189 fl_free(fl);
190 atomic_dec(&fl_size);
191 continue;
192 }
193 flp = &fl->next;
194 }
195 }
196 spin_unlock(&ip6_fl_lock);
197 }
198
199 static struct ip6_flowlabel *fl_intern(struct net *net,
200 struct ip6_flowlabel *fl, __be32 label)
201 {
202 struct ip6_flowlabel *lfl;
203
204 fl->label = label & IPV6_FLOWLABEL_MASK;
205
206 spin_lock_bh(&ip6_fl_lock);
207 if (label == 0) {
208 for (;;) {
209 fl->label = htonl(net_random())&IPV6_FLOWLABEL_MASK;
210 if (fl->label) {
211 lfl = __fl_lookup(net, fl->label);
212 if (lfl == NULL)
213 break;
214 }
215 }
216 } else {
217 /*
218 * we dropper the ip6_fl_lock, so this entry could reappear
219 * and we need to recheck with it.
220 *
221 * OTOH no need to search the active socket first, like it is
222 * done in ipv6_flowlabel_opt - sock is locked, so new entry
223 * with the same label can only appear on another sock
224 */
225 lfl = __fl_lookup(net, fl->label);
226 if (lfl != NULL) {
227 atomic_inc(&lfl->users);
228 spin_unlock_bh(&ip6_fl_lock);
229 return lfl;
230 }
231 }
232
233 fl->lastuse = jiffies;
234 fl->next = fl_ht[FL_HASH(fl->label)];
235 rcu_assign_pointer(fl_ht[FL_HASH(fl->label)], fl);
236 atomic_inc(&fl_size);
237 spin_unlock_bh(&ip6_fl_lock);
238 return NULL;
239 }
240
241
242
243 /* Socket flowlabel lists */
244
245 struct ip6_flowlabel * fl6_sock_lookup(struct sock *sk, __be32 label)
246 {
247 struct ipv6_fl_socklist *sfl;
248 struct ipv6_pinfo *np = inet6_sk(sk);
249
250 label &= IPV6_FLOWLABEL_MASK;
251
252 rcu_read_lock_bh();
253 for_each_sk_fl_rcu(np, sfl) {
254 struct ip6_flowlabel *fl = sfl->fl;
255 if (fl->label == label) {
256 fl->lastuse = jiffies;
257 atomic_inc(&fl->users);
258 rcu_read_unlock_bh();
259 return fl;
260 }
261 }
262 rcu_read_unlock_bh();
263 return NULL;
264 }
265
266 EXPORT_SYMBOL_GPL(fl6_sock_lookup);
267
268 void fl6_free_socklist(struct sock *sk)
269 {
270 struct ipv6_pinfo *np = inet6_sk(sk);
271 struct ipv6_fl_socklist *sfl;
272
273 if (!rcu_access_pointer(np->ipv6_fl_list))
274 return;
275
276 spin_lock_bh(&ip6_sk_fl_lock);
277 while ((sfl = rcu_dereference_protected(np->ipv6_fl_list,
278 lockdep_is_held(&ip6_sk_fl_lock))) != NULL) {
279 np->ipv6_fl_list = sfl->next;
280 spin_unlock_bh(&ip6_sk_fl_lock);
281
282 fl_release(sfl->fl);
283 kfree_rcu(sfl, rcu);
284
285 spin_lock_bh(&ip6_sk_fl_lock);
286 }
287 spin_unlock_bh(&ip6_sk_fl_lock);
288 }
289
290 /* Service routines */
291
292
293 /*
294 It is the only difficult place. flowlabel enforces equal headers
295 before and including routing header, however user may supply options
296 following rthdr.
297 */
298
299 struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions * opt_space,
300 struct ip6_flowlabel * fl,
301 struct ipv6_txoptions * fopt)
302 {
303 struct ipv6_txoptions * fl_opt = fl->opt;
304
305 if (fopt == NULL || fopt->opt_flen == 0)
306 return fl_opt;
307
308 if (fl_opt != NULL) {
309 opt_space->hopopt = fl_opt->hopopt;
310 opt_space->dst0opt = fl_opt->dst0opt;
311 opt_space->srcrt = fl_opt->srcrt;
312 opt_space->opt_nflen = fl_opt->opt_nflen;
313 } else {
314 if (fopt->opt_nflen == 0)
315 return fopt;
316 opt_space->hopopt = NULL;
317 opt_space->dst0opt = NULL;
318 opt_space->srcrt = NULL;
319 opt_space->opt_nflen = 0;
320 }
321 opt_space->dst1opt = fopt->dst1opt;
322 opt_space->opt_flen = fopt->opt_flen;
323 return opt_space;
324 }
325 EXPORT_SYMBOL_GPL(fl6_merge_options);
326
327 static unsigned long check_linger(unsigned long ttl)
328 {
329 if (ttl < FL_MIN_LINGER)
330 return FL_MIN_LINGER*HZ;
331 if (ttl > FL_MAX_LINGER && !capable(CAP_NET_ADMIN))
332 return 0;
333 return ttl*HZ;
334 }
335
336 static int fl6_renew(struct ip6_flowlabel *fl, unsigned long linger, unsigned long expires)
337 {
338 linger = check_linger(linger);
339 if (!linger)
340 return -EPERM;
341 expires = check_linger(expires);
342 if (!expires)
343 return -EPERM;
344 fl->lastuse = jiffies;
345 if (time_before(fl->linger, linger))
346 fl->linger = linger;
347 if (time_before(expires, fl->linger))
348 expires = fl->linger;
349 if (time_before(fl->expires, fl->lastuse + expires))
350 fl->expires = fl->lastuse + expires;
351 return 0;
352 }
353
354 static struct ip6_flowlabel *
355 fl_create(struct net *net, struct sock *sk, struct in6_flowlabel_req *freq,
356 char __user *optval, int optlen, int *err_p)
357 {
358 struct ip6_flowlabel *fl = NULL;
359 int olen;
360 int addr_type;
361 int err;
362
363 olen = optlen - CMSG_ALIGN(sizeof(*freq));
364 err = -EINVAL;
365 if (olen > 64 * 1024)
366 goto done;
367
368 err = -ENOMEM;
369 fl = kzalloc(sizeof(*fl), GFP_KERNEL);
370 if (fl == NULL)
371 goto done;
372
373 if (olen > 0) {
374 struct msghdr msg;
375 struct flowi6 flowi6;
376 int junk;
377
378 err = -ENOMEM;
379 fl->opt = kmalloc(sizeof(*fl->opt) + olen, GFP_KERNEL);
380 if (fl->opt == NULL)
381 goto done;
382
383 memset(fl->opt, 0, sizeof(*fl->opt));
384 fl->opt->tot_len = sizeof(*fl->opt) + olen;
385 err = -EFAULT;
386 if (copy_from_user(fl->opt+1, optval+CMSG_ALIGN(sizeof(*freq)), olen))
387 goto done;
388
389 msg.msg_controllen = olen;
390 msg.msg_control = (void*)(fl->opt+1);
391 memset(&flowi6, 0, sizeof(flowi6));
392
393 err = ip6_datagram_send_ctl(net, sk, &msg, &flowi6, fl->opt,
394 &junk, &junk, &junk);
395 if (err)
396 goto done;
397 err = -EINVAL;
398 if (fl->opt->opt_flen)
399 goto done;
400 if (fl->opt->opt_nflen == 0) {
401 kfree(fl->opt);
402 fl->opt = NULL;
403 }
404 }
405
406 fl->fl_net = hold_net(net);
407 fl->expires = jiffies;
408 err = fl6_renew(fl, freq->flr_linger, freq->flr_expires);
409 if (err)
410 goto done;
411 fl->share = freq->flr_share;
412 addr_type = ipv6_addr_type(&freq->flr_dst);
413 if ((addr_type & IPV6_ADDR_MAPPED) ||
414 addr_type == IPV6_ADDR_ANY) {
415 err = -EINVAL;
416 goto done;
417 }
418 fl->dst = freq->flr_dst;
419 atomic_set(&fl->users, 1);
420 switch (fl->share) {
421 case IPV6_FL_S_EXCL:
422 case IPV6_FL_S_ANY:
423 break;
424 case IPV6_FL_S_PROCESS:
425 fl->owner.pid = get_task_pid(current, PIDTYPE_PID);
426 break;
427 case IPV6_FL_S_USER:
428 fl->owner.uid = current_euid();
429 break;
430 default:
431 err = -EINVAL;
432 goto done;
433 }
434 return fl;
435
436 done:
437 fl_free(fl);
438 *err_p = err;
439 return NULL;
440 }
441
442 static int mem_check(struct sock *sk)
443 {
444 struct ipv6_pinfo *np = inet6_sk(sk);
445 struct ipv6_fl_socklist *sfl;
446 int room = FL_MAX_SIZE - atomic_read(&fl_size);
447 int count = 0;
448
449 if (room > FL_MAX_SIZE - FL_MAX_PER_SOCK)
450 return 0;
451
452 for_each_sk_fl_rcu(np, sfl)
453 count++;
454
455 if (room <= 0 ||
456 ((count >= FL_MAX_PER_SOCK ||
457 (count > 0 && room < FL_MAX_SIZE/2) || room < FL_MAX_SIZE/4) &&
458 !capable(CAP_NET_ADMIN)))
459 return -ENOBUFS;
460
461 return 0;
462 }
463
464 static bool ipv6_hdr_cmp(struct ipv6_opt_hdr *h1, struct ipv6_opt_hdr *h2)
465 {
466 if (h1 == h2)
467 return false;
468 if (h1 == NULL || h2 == NULL)
469 return true;
470 if (h1->hdrlen != h2->hdrlen)
471 return true;
472 return memcmp(h1+1, h2+1, ((h1->hdrlen+1)<<3) - sizeof(*h1));
473 }
474
475 static bool ipv6_opt_cmp(struct ipv6_txoptions *o1, struct ipv6_txoptions *o2)
476 {
477 if (o1 == o2)
478 return false;
479 if (o1 == NULL || o2 == NULL)
480 return true;
481 if (o1->opt_nflen != o2->opt_nflen)
482 return true;
483 if (ipv6_hdr_cmp(o1->hopopt, o2->hopopt))
484 return true;
485 if (ipv6_hdr_cmp(o1->dst0opt, o2->dst0opt))
486 return true;
487 if (ipv6_hdr_cmp((struct ipv6_opt_hdr *)o1->srcrt, (struct ipv6_opt_hdr *)o2->srcrt))
488 return true;
489 return false;
490 }
491
492 static inline void fl_link(struct ipv6_pinfo *np, struct ipv6_fl_socklist *sfl,
493 struct ip6_flowlabel *fl)
494 {
495 spin_lock_bh(&ip6_sk_fl_lock);
496 sfl->fl = fl;
497 sfl->next = np->ipv6_fl_list;
498 rcu_assign_pointer(np->ipv6_fl_list, sfl);
499 spin_unlock_bh(&ip6_sk_fl_lock);
500 }
501
502 int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen)
503 {
504 int uninitialized_var(err);
505 struct net *net = sock_net(sk);
506 struct ipv6_pinfo *np = inet6_sk(sk);
507 struct in6_flowlabel_req freq;
508 struct ipv6_fl_socklist *sfl1=NULL;
509 struct ipv6_fl_socklist *sfl, **sflp;
510 struct ip6_flowlabel *fl, *fl1 = NULL;
511
512
513 if (optlen < sizeof(freq))
514 return -EINVAL;
515
516 if (copy_from_user(&freq, optval, sizeof(freq)))
517 return -EFAULT;
518
519 switch (freq.flr_action) {
520 case IPV6_FL_A_PUT:
521 spin_lock_bh(&ip6_sk_fl_lock);
522 for (sflp = &np->ipv6_fl_list;
523 (sfl = rcu_dereference(*sflp))!=NULL;
524 sflp = &sfl->next) {
525 if (sfl->fl->label == freq.flr_label) {
526 if (freq.flr_label == (np->flow_label&IPV6_FLOWLABEL_MASK))
527 np->flow_label &= ~IPV6_FLOWLABEL_MASK;
528 *sflp = rcu_dereference(sfl->next);
529 spin_unlock_bh(&ip6_sk_fl_lock);
530 fl_release(sfl->fl);
531 kfree_rcu(sfl, rcu);
532 return 0;
533 }
534 }
535 spin_unlock_bh(&ip6_sk_fl_lock);
536 return -ESRCH;
537
538 case IPV6_FL_A_RENEW:
539 rcu_read_lock_bh();
540 for_each_sk_fl_rcu(np, sfl) {
541 if (sfl->fl->label == freq.flr_label) {
542 err = fl6_renew(sfl->fl, freq.flr_linger, freq.flr_expires);
543 rcu_read_unlock_bh();
544 return err;
545 }
546 }
547 rcu_read_unlock_bh();
548
549 if (freq.flr_share == IPV6_FL_S_NONE &&
550 ns_capable(net->user_ns, CAP_NET_ADMIN)) {
551 fl = fl_lookup(net, freq.flr_label);
552 if (fl) {
553 err = fl6_renew(fl, freq.flr_linger, freq.flr_expires);
554 fl_release(fl);
555 return err;
556 }
557 }
558 return -ESRCH;
559
560 case IPV6_FL_A_GET:
561 if (freq.flr_label & ~IPV6_FLOWLABEL_MASK)
562 return -EINVAL;
563
564 fl = fl_create(net, sk, &freq, optval, optlen, &err);
565 if (fl == NULL)
566 return err;
567 sfl1 = kmalloc(sizeof(*sfl1), GFP_KERNEL);
568
569 if (freq.flr_label) {
570 err = -EEXIST;
571 rcu_read_lock_bh();
572 for_each_sk_fl_rcu(np, sfl) {
573 if (sfl->fl->label == freq.flr_label) {
574 if (freq.flr_flags&IPV6_FL_F_EXCL) {
575 rcu_read_unlock_bh();
576 goto done;
577 }
578 fl1 = sfl->fl;
579 atomic_inc(&fl1->users);
580 break;
581 }
582 }
583 rcu_read_unlock_bh();
584
585 if (fl1 == NULL)
586 fl1 = fl_lookup(net, freq.flr_label);
587 if (fl1) {
588 recheck:
589 err = -EEXIST;
590 if (freq.flr_flags&IPV6_FL_F_EXCL)
591 goto release;
592 err = -EPERM;
593 if (fl1->share == IPV6_FL_S_EXCL ||
594 fl1->share != fl->share ||
595 ((fl1->share == IPV6_FL_S_PROCESS) &&
596 (fl1->owner.pid == fl->owner.pid)) ||
597 ((fl1->share == IPV6_FL_S_USER) &&
598 uid_eq(fl1->owner.uid, fl->owner.uid)))
599 goto release;
600
601 err = -EINVAL;
602 if (!ipv6_addr_equal(&fl1->dst, &fl->dst) ||
603 ipv6_opt_cmp(fl1->opt, fl->opt))
604 goto release;
605
606 err = -ENOMEM;
607 if (sfl1 == NULL)
608 goto release;
609 if (fl->linger > fl1->linger)
610 fl1->linger = fl->linger;
611 if ((long)(fl->expires - fl1->expires) > 0)
612 fl1->expires = fl->expires;
613 fl_link(np, sfl1, fl1);
614 fl_free(fl);
615 return 0;
616
617 release:
618 fl_release(fl1);
619 goto done;
620 }
621 }
622 err = -ENOENT;
623 if (!(freq.flr_flags&IPV6_FL_F_CREATE))
624 goto done;
625
626 err = -ENOMEM;
627 if (sfl1 == NULL || (err = mem_check(sk)) != 0)
628 goto done;
629
630 fl1 = fl_intern(net, fl, freq.flr_label);
631 if (fl1 != NULL)
632 goto recheck;
633
634 if (!freq.flr_label) {
635 if (copy_to_user(&((struct in6_flowlabel_req __user *) optval)->flr_label,
636 &fl->label, sizeof(fl->label))) {
637 /* Intentionally ignore fault. */
638 }
639 }
640
641 fl_link(np, sfl1, fl);
642 return 0;
643
644 default:
645 return -EINVAL;
646 }
647
648 done:
649 fl_free(fl);
650 kfree(sfl1);
651 return err;
652 }
653
654 #ifdef CONFIG_PROC_FS
655
656 struct ip6fl_iter_state {
657 struct seq_net_private p;
658 struct pid_namespace *pid_ns;
659 int bucket;
660 };
661
662 #define ip6fl_seq_private(seq) ((struct ip6fl_iter_state *)(seq)->private)
663
664 static struct ip6_flowlabel *ip6fl_get_first(struct seq_file *seq)
665 {
666 struct ip6_flowlabel *fl = NULL;
667 struct ip6fl_iter_state *state = ip6fl_seq_private(seq);
668 struct net *net = seq_file_net(seq);
669
670 for (state->bucket = 0; state->bucket <= FL_HASH_MASK; ++state->bucket) {
671 for_each_fl_rcu(state->bucket, fl) {
672 if (net_eq(fl->fl_net, net))
673 goto out;
674 }
675 }
676 fl = NULL;
677 out:
678 return fl;
679 }
680
681 static struct ip6_flowlabel *ip6fl_get_next(struct seq_file *seq, struct ip6_flowlabel *fl)
682 {
683 struct ip6fl_iter_state *state = ip6fl_seq_private(seq);
684 struct net *net = seq_file_net(seq);
685
686 for_each_fl_continue_rcu(fl) {
687 if (net_eq(fl->fl_net, net))
688 goto out;
689 }
690
691 try_again:
692 if (++state->bucket <= FL_HASH_MASK) {
693 for_each_fl_rcu(state->bucket, fl) {
694 if (net_eq(fl->fl_net, net))
695 goto out;
696 }
697 goto try_again;
698 }
699 fl = NULL;
700
701 out:
702 return fl;
703 }
704
705 static struct ip6_flowlabel *ip6fl_get_idx(struct seq_file *seq, loff_t pos)
706 {
707 struct ip6_flowlabel *fl = ip6fl_get_first(seq);
708 if (fl)
709 while (pos && (fl = ip6fl_get_next(seq, fl)) != NULL)
710 --pos;
711 return pos ? NULL : fl;
712 }
713
714 static void *ip6fl_seq_start(struct seq_file *seq, loff_t *pos)
715 __acquires(RCU)
716 {
717 rcu_read_lock_bh();
718 return *pos ? ip6fl_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
719 }
720
721 static void *ip6fl_seq_next(struct seq_file *seq, void *v, loff_t *pos)
722 {
723 struct ip6_flowlabel *fl;
724
725 if (v == SEQ_START_TOKEN)
726 fl = ip6fl_get_first(seq);
727 else
728 fl = ip6fl_get_next(seq, v);
729 ++*pos;
730 return fl;
731 }
732
733 static void ip6fl_seq_stop(struct seq_file *seq, void *v)
734 __releases(RCU)
735 {
736 rcu_read_unlock_bh();
737 }
738
739 static int ip6fl_seq_show(struct seq_file *seq, void *v)
740 {
741 struct ip6fl_iter_state *state = ip6fl_seq_private(seq);
742 if (v == SEQ_START_TOKEN)
743 seq_printf(seq, "%-5s %-1s %-6s %-6s %-6s %-8s %-32s %s\n",
744 "Label", "S", "Owner", "Users", "Linger", "Expires", "Dst", "Opt");
745 else {
746 struct ip6_flowlabel *fl = v;
747 seq_printf(seq,
748 "%05X %-1d %-6d %-6d %-6ld %-8ld %pi6 %-4d\n",
749 (unsigned int)ntohl(fl->label),
750 fl->share,
751 ((fl->share == IPV6_FL_S_PROCESS) ?
752 pid_nr_ns(fl->owner.pid, state->pid_ns) :
753 ((fl->share == IPV6_FL_S_USER) ?
754 from_kuid_munged(seq_user_ns(seq), fl->owner.uid) :
755 0)),
756 atomic_read(&fl->users),
757 fl->linger/HZ,
758 (long)(fl->expires - jiffies)/HZ,
759 &fl->dst,
760 fl->opt ? fl->opt->opt_nflen : 0);
761 }
762 return 0;
763 }
764
765 static const struct seq_operations ip6fl_seq_ops = {
766 .start = ip6fl_seq_start,
767 .next = ip6fl_seq_next,
768 .stop = ip6fl_seq_stop,
769 .show = ip6fl_seq_show,
770 };
771
772 static int ip6fl_seq_open(struct inode *inode, struct file *file)
773 {
774 struct seq_file *seq;
775 struct ip6fl_iter_state *state;
776 int err;
777
778 err = seq_open_net(inode, file, &ip6fl_seq_ops,
779 sizeof(struct ip6fl_iter_state));
780
781 if (!err) {
782 seq = file->private_data;
783 state = ip6fl_seq_private(seq);
784 rcu_read_lock();
785 state->pid_ns = get_pid_ns(task_active_pid_ns(current));
786 rcu_read_unlock();
787 }
788 return err;
789 }
790
791 static int ip6fl_seq_release(struct inode *inode, struct file *file)
792 {
793 struct seq_file *seq = file->private_data;
794 struct ip6fl_iter_state *state = ip6fl_seq_private(seq);
795 put_pid_ns(state->pid_ns);
796 return seq_release_net(inode, file);
797 }
798
799 static const struct file_operations ip6fl_seq_fops = {
800 .owner = THIS_MODULE,
801 .open = ip6fl_seq_open,
802 .read = seq_read,
803 .llseek = seq_lseek,
804 .release = ip6fl_seq_release,
805 };
806
807 static int __net_init ip6_flowlabel_proc_init(struct net *net)
808 {
809 if (!proc_create("ip6_flowlabel", S_IRUGO, net->proc_net,
810 &ip6fl_seq_fops))
811 return -ENOMEM;
812 return 0;
813 }
814
815 static void __net_exit ip6_flowlabel_proc_fini(struct net *net)
816 {
817 remove_proc_entry("ip6_flowlabel", net->proc_net);
818 }
819 #else
820 static inline int ip6_flowlabel_proc_init(struct net *net)
821 {
822 return 0;
823 }
824 static inline void ip6_flowlabel_proc_fini(struct net *net)
825 {
826 }
827 #endif
828
829 static void __net_exit ip6_flowlabel_net_exit(struct net *net)
830 {
831 ip6_fl_purge(net);
832 ip6_flowlabel_proc_fini(net);
833 }
834
835 static struct pernet_operations ip6_flowlabel_net_ops = {
836 .init = ip6_flowlabel_proc_init,
837 .exit = ip6_flowlabel_net_exit,
838 };
839
840 int ip6_flowlabel_init(void)
841 {
842 return register_pernet_subsys(&ip6_flowlabel_net_ops);
843 }
844
845 void ip6_flowlabel_cleanup(void)
846 {
847 del_timer(&ip6_fl_gc_timer);
848 unregister_pernet_subsys(&ip6_flowlabel_net_ops);
849 }
kernel source for telekom puls (alcatel/mediatek)