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KVM: nVMX: Fix memory corruption when using VMCS shadowing
[linux/fpc-iii.git] / net / ipv6 / ip6_flowlabel.c
blobb912f0dbaf724f63d60f2d06dae57eba334c96fa
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/in6.h>
19 #include <linux/proc_fs.h>
20 #include <linux/seq_file.h>
21 #include <linux/slab.h>
22 #include <linux/export.h>
23 #include <linux/pid_namespace.h>
24
25 #include <net/net_namespace.h>
26 #include <net/sock.h>
27
28 #include <net/ipv6.h>
29 #include <net/rawv6.h>
30 #include <net/transp_v6.h>
31
32 #include <asm/uaccess.h>
33
34 #define FL_MIN_LINGER 6 /* Minimal linger. It is set to 6sec specified
35 in old IPv6 RFC. Well, it was reasonable value.
36 */
37 #define FL_MAX_LINGER 150 /* Maximal linger timeout */
38
39 /* FL hash table */
40
41 #define FL_MAX_PER_SOCK 32
42 #define FL_MAX_SIZE 4096
43 #define FL_HASH_MASK 255
44 #define FL_HASH(l) (ntohl(l)&FL_HASH_MASK)
45
46 static atomic_t fl_size = ATOMIC_INIT(0);
47 static struct ip6_flowlabel __rcu *fl_ht[FL_HASH_MASK+1];
48
49 static void ip6_fl_gc(unsigned long dummy);
50 static DEFINE_TIMER(ip6_fl_gc_timer, ip6_fl_gc, 0, 0);
51
52 /* FL hash table lock: it protects only of GC */
53
54 static DEFINE_SPINLOCK(ip6_fl_lock);
55
56 /* Big socket sock */
57
58 static DEFINE_SPINLOCK(ip6_sk_fl_lock);
59
60 #define for_each_fl_rcu(hash, fl) \
61 for (fl = rcu_dereference_bh(fl_ht[(hash)]); \
62 fl != NULL; \
63 fl = rcu_dereference_bh(fl->next))
64 #define for_each_fl_continue_rcu(fl) \
65 for (fl = rcu_dereference_bh(fl->next); \
66 fl != NULL; \
67 fl = rcu_dereference_bh(fl->next))
68
69 #define for_each_sk_fl_rcu(np, sfl) \
70 for (sfl = rcu_dereference_bh(np->ipv6_fl_list); \
71 sfl != NULL; \
72 sfl = rcu_dereference_bh(sfl->next))
73
74 static inline struct ip6_flowlabel *__fl_lookup(struct net *net, __be32 label)
75 {
76 struct ip6_flowlabel *fl;
77
78 for_each_fl_rcu(FL_HASH(label), fl) {
79 if (fl->label == label && net_eq(fl->fl_net, net))
80 return fl;
81 }
82 return NULL;
83 }
84
85 static struct ip6_flowlabel *fl_lookup(struct net *net, __be32 label)
86 {
87 struct ip6_flowlabel *fl;
88
89 rcu_read_lock_bh();
90 fl = __fl_lookup(net, label);
91 if (fl && !atomic_inc_not_zero(&fl->users))
92 fl = NULL;
93 rcu_read_unlock_bh();
94 return fl;
95 }
96
97
98 static void fl_free(struct ip6_flowlabel *fl)
99 {
100 if (fl) {
101 if (fl->share == IPV6_FL_S_PROCESS)
102 put_pid(fl->owner.pid);
103 kfree(fl->opt);
104 kfree_rcu(fl, rcu);
105 }
106 }
107
108 static void fl_release(struct ip6_flowlabel *fl)
109 {
110 spin_lock_bh(&ip6_fl_lock);
111
112 fl->lastuse = jiffies;
113 if (atomic_dec_and_test(&fl->users)) {
114 unsigned long ttd = fl->lastuse + fl->linger;
115 if (time_after(ttd, fl->expires))
116 fl->expires = ttd;
117 ttd = fl->expires;
118 if (fl->opt && fl->share == IPV6_FL_S_EXCL) {
119 struct ipv6_txoptions *opt = fl->opt;
120 fl->opt = NULL;
121 kfree(opt);
122 }
123 if (!timer_pending(&ip6_fl_gc_timer) ||
124 time_after(ip6_fl_gc_timer.expires, ttd))
125 mod_timer(&ip6_fl_gc_timer, ttd);
126 }
127 spin_unlock_bh(&ip6_fl_lock);
128 }
129
130 static void ip6_fl_gc(unsigned long dummy)
131 {
132 int i;
133 unsigned long now = jiffies;
134 unsigned long sched = 0;
135
136 spin_lock(&ip6_fl_lock);
137
138 for (i = 0; i <= FL_HASH_MASK; i++) {
139 struct ip6_flowlabel *fl;
140 struct ip6_flowlabel __rcu **flp;
141
142 flp = &fl_ht[i];
143 while ((fl = rcu_dereference_protected(*flp,
144 lockdep_is_held(&ip6_fl_lock))) != NULL) {
145 if (atomic_read(&fl->users) == 0) {
146 unsigned long ttd = fl->lastuse + fl->linger;
147 if (time_after(ttd, fl->expires))
148 fl->expires = ttd;
149 ttd = fl->expires;
150 if (time_after_eq(now, ttd)) {
151 *flp = fl->next;
152 fl_free(fl);
153 atomic_dec(&fl_size);
154 continue;
155 }
156 if (!sched || time_before(ttd, sched))
157 sched = ttd;
158 }
159 flp = &fl->next;
160 }
161 }
162 if (!sched && atomic_read(&fl_size))
163 sched = now + FL_MAX_LINGER;
164 if (sched) {
165 mod_timer(&ip6_fl_gc_timer, sched);
166 }
167 spin_unlock(&ip6_fl_lock);
168 }
169
170 static void __net_exit ip6_fl_purge(struct net *net)
171 {
172 int i;
173
174 spin_lock_bh(&ip6_fl_lock);
175 for (i = 0; i <= FL_HASH_MASK; i++) {
176 struct ip6_flowlabel *fl;
177 struct ip6_flowlabel __rcu **flp;
178
179 flp = &fl_ht[i];
180 while ((fl = rcu_dereference_protected(*flp,
181 lockdep_is_held(&ip6_fl_lock))) != NULL) {
182 if (net_eq(fl->fl_net, net) &&
183 atomic_read(&fl->users) == 0) {
184 *flp = fl->next;
185 fl_free(fl);
186 atomic_dec(&fl_size);
187 continue;
188 }
189 flp = &fl->next;
190 }
191 }
192 spin_unlock_bh(&ip6_fl_lock);
193 }
194
195 static struct ip6_flowlabel *fl_intern(struct net *net,
196 struct ip6_flowlabel *fl, __be32 label)
197 {
198 struct ip6_flowlabel *lfl;
199
200 fl->label = label & IPV6_FLOWLABEL_MASK;
201
202 spin_lock_bh(&ip6_fl_lock);
203 if (label == 0) {
204 for (;;) {
205 fl->label = htonl(prandom_u32())&IPV6_FLOWLABEL_MASK;
206 if (fl->label) {
207 lfl = __fl_lookup(net, fl->label);
208 if (!lfl)
209 break;
210 }
211 }
212 } else {
213 /*
214 * we dropper the ip6_fl_lock, so this entry could reappear
215 * and we need to recheck with it.
216 *
217 * OTOH no need to search the active socket first, like it is
218 * done in ipv6_flowlabel_opt - sock is locked, so new entry
219 * with the same label can only appear on another sock
220 */
221 lfl = __fl_lookup(net, fl->label);
222 if (lfl) {
223 atomic_inc(&lfl->users);
224 spin_unlock_bh(&ip6_fl_lock);
225 return lfl;
226 }
227 }
228
229 fl->lastuse = jiffies;
230 fl->next = fl_ht[FL_HASH(fl->label)];
231 rcu_assign_pointer(fl_ht[FL_HASH(fl->label)], fl);
232 atomic_inc(&fl_size);
233 spin_unlock_bh(&ip6_fl_lock);
234 return NULL;
235 }
236
237
238
239 /* Socket flowlabel lists */
240
241 struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk, __be32 label)
242 {
243 struct ipv6_fl_socklist *sfl;
244 struct ipv6_pinfo *np = inet6_sk(sk);
245
246 label &= IPV6_FLOWLABEL_MASK;
247
248 rcu_read_lock_bh();
249 for_each_sk_fl_rcu(np, sfl) {
250 struct ip6_flowlabel *fl = sfl->fl;
251 if (fl->label == label) {
252 fl->lastuse = jiffies;
253 atomic_inc(&fl->users);
254 rcu_read_unlock_bh();
255 return fl;
256 }
257 }
258 rcu_read_unlock_bh();
259 return NULL;
260 }
261 EXPORT_SYMBOL_GPL(fl6_sock_lookup);
262
263 void fl6_free_socklist(struct sock *sk)
264 {
265 struct ipv6_pinfo *np = inet6_sk(sk);
266 struct ipv6_fl_socklist *sfl;
267
268 if (!rcu_access_pointer(np->ipv6_fl_list))
269 return;
270
271 spin_lock_bh(&ip6_sk_fl_lock);
272 while ((sfl = rcu_dereference_protected(np->ipv6_fl_list,
273 lockdep_is_held(&ip6_sk_fl_lock))) != NULL) {
274 np->ipv6_fl_list = sfl->next;
275 spin_unlock_bh(&ip6_sk_fl_lock);
276
277 fl_release(sfl->fl);
278 kfree_rcu(sfl, rcu);
279
280 spin_lock_bh(&ip6_sk_fl_lock);
281 }
282 spin_unlock_bh(&ip6_sk_fl_lock);
283 }
284
285 /* Service routines */
286
287
288 /*
289 It is the only difficult place. flowlabel enforces equal headers
290 before and including routing header, however user may supply options
291 following rthdr.
292 */
293
294 struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions *opt_space,
295 struct ip6_flowlabel *fl,
296 struct ipv6_txoptions *fopt)
297 {
298 struct ipv6_txoptions *fl_opt = fl->opt;
299
300 if (!fopt || fopt->opt_flen == 0)
301 return fl_opt;
302
303 if (fl_opt) {
304 opt_space->hopopt = fl_opt->hopopt;
305 opt_space->dst0opt = fl_opt->dst0opt;
306 opt_space->srcrt = fl_opt->srcrt;
307 opt_space->opt_nflen = fl_opt->opt_nflen;
308 } else {
309 if (fopt->opt_nflen == 0)
310 return fopt;
311 opt_space->hopopt = NULL;
312 opt_space->dst0opt = NULL;
313 opt_space->srcrt = NULL;
314 opt_space->opt_nflen = 0;
315 }
316 opt_space->dst1opt = fopt->dst1opt;
317 opt_space->opt_flen = fopt->opt_flen;
318 return opt_space;
319 }
320 EXPORT_SYMBOL_GPL(fl6_merge_options);
321
322 static unsigned long check_linger(unsigned long ttl)
323 {
324 if (ttl < FL_MIN_LINGER)
325 return FL_MIN_LINGER*HZ;
326 if (ttl > FL_MAX_LINGER && !capable(CAP_NET_ADMIN))
327 return 0;
328 return ttl*HZ;
329 }
330
331 static int fl6_renew(struct ip6_flowlabel *fl, unsigned long linger, unsigned long expires)
332 {
333 linger = check_linger(linger);
334 if (!linger)
335 return -EPERM;
336 expires = check_linger(expires);
337 if (!expires)
338 return -EPERM;
339
340 spin_lock_bh(&ip6_fl_lock);
341 fl->lastuse = jiffies;
342 if (time_before(fl->linger, linger))
343 fl->linger = linger;
344 if (time_before(expires, fl->linger))
345 expires = fl->linger;
346 if (time_before(fl->expires, fl->lastuse + expires))
347 fl->expires = fl->lastuse + expires;
348 spin_unlock_bh(&ip6_fl_lock);
349
350 return 0;
351 }
352
353 static struct ip6_flowlabel *
354 fl_create(struct net *net, struct sock *sk, struct in6_flowlabel_req *freq,
355 char __user *optval, int optlen, int *err_p)
356 {
357 struct ip6_flowlabel *fl = NULL;
358 int olen;
359 int addr_type;
360 int err;
361
362 olen = optlen - CMSG_ALIGN(sizeof(*freq));
363 err = -EINVAL;
364 if (olen > 64 * 1024)
365 goto done;
366
367 err = -ENOMEM;
368 fl = kzalloc(sizeof(*fl), GFP_KERNEL);
369 if (!fl)
370 goto done;
371
372 if (olen > 0) {
373 struct msghdr msg;
374 struct flowi6 flowi6;
375 struct sockcm_cookie sockc_junk;
376 struct ipcm6_cookie ipc6;
377
378 err = -ENOMEM;
379 fl->opt = kmalloc(sizeof(*fl->opt) + olen, GFP_KERNEL);
380 if (!fl->opt)
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 ipc6.opt = fl->opt;
394 err = ip6_datagram_send_ctl(net, sk, &msg, &flowi6, &ipc6, &sockc_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 = 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 rcu_read_lock_bh();
453 for_each_sk_fl_rcu(np, sfl)
454 count++;
455 rcu_read_unlock_bh();
456
457 if (room <= 0 ||
458 ((count >= FL_MAX_PER_SOCK ||
459 (count > 0 && room < FL_MAX_SIZE/2) || room < FL_MAX_SIZE/4) &&
460 !capable(CAP_NET_ADMIN)))
461 return -ENOBUFS;
462
463 return 0;
464 }
465
466 static inline void fl_link(struct ipv6_pinfo *np, struct ipv6_fl_socklist *sfl,
467 struct ip6_flowlabel *fl)
468 {
469 spin_lock_bh(&ip6_sk_fl_lock);
470 sfl->fl = fl;
471 sfl->next = np->ipv6_fl_list;
472 rcu_assign_pointer(np->ipv6_fl_list, sfl);
473 spin_unlock_bh(&ip6_sk_fl_lock);
474 }
475
476 int ipv6_flowlabel_opt_get(struct sock *sk, struct in6_flowlabel_req *freq,
477 int flags)
478 {
479 struct ipv6_pinfo *np = inet6_sk(sk);
480 struct ipv6_fl_socklist *sfl;
481
482 if (flags & IPV6_FL_F_REMOTE) {
483 freq->flr_label = np->rcv_flowinfo & IPV6_FLOWLABEL_MASK;
484 return 0;
485 }
486
487 if (np->repflow) {
488 freq->flr_label = np->flow_label;
489 return 0;
490 }
491
492 rcu_read_lock_bh();
493
494 for_each_sk_fl_rcu(np, sfl) {
495 if (sfl->fl->label == (np->flow_label & IPV6_FLOWLABEL_MASK)) {
496 spin_lock_bh(&ip6_fl_lock);
497 freq->flr_label = sfl->fl->label;
498 freq->flr_dst = sfl->fl->dst;
499 freq->flr_share = sfl->fl->share;
500 freq->flr_expires = (sfl->fl->expires - jiffies) / HZ;
501 freq->flr_linger = sfl->fl->linger / HZ;
502
503 spin_unlock_bh(&ip6_fl_lock);
504 rcu_read_unlock_bh();
505 return 0;
506 }
507 }
508 rcu_read_unlock_bh();
509
510 return -ENOENT;
511 }
512
513 int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen)
514 {
515 int uninitialized_var(err);
516 struct net *net = sock_net(sk);
517 struct ipv6_pinfo *np = inet6_sk(sk);
518 struct in6_flowlabel_req freq;
519 struct ipv6_fl_socklist *sfl1 = NULL;
520 struct ipv6_fl_socklist *sfl;
521 struct ipv6_fl_socklist __rcu **sflp;
522 struct ip6_flowlabel *fl, *fl1 = NULL;
523
524
525 if (optlen < sizeof(freq))
526 return -EINVAL;
527
528 if (copy_from_user(&freq, optval, sizeof(freq)))
529 return -EFAULT;
530
531 switch (freq.flr_action) {
532 case IPV6_FL_A_PUT:
533 if (freq.flr_flags & IPV6_FL_F_REFLECT) {
534 if (sk->sk_protocol != IPPROTO_TCP)
535 return -ENOPROTOOPT;
536 if (!np->repflow)
537 return -ESRCH;
538 np->flow_label = 0;
539 np->repflow = 0;
540 return 0;
541 }
542 spin_lock_bh(&ip6_sk_fl_lock);
543 for (sflp = &np->ipv6_fl_list;
544 (sfl = rcu_dereference_protected(*sflp,
545 lockdep_is_held(&ip6_sk_fl_lock))) != NULL;
546 sflp = &sfl->next) {
547 if (sfl->fl->label == freq.flr_label) {
548 if (freq.flr_label == (np->flow_label&IPV6_FLOWLABEL_MASK))
549 np->flow_label &= ~IPV6_FLOWLABEL_MASK;
550 *sflp = sfl->next;
551 spin_unlock_bh(&ip6_sk_fl_lock);
552 fl_release(sfl->fl);
553 kfree_rcu(sfl, rcu);
554 return 0;
555 }
556 }
557 spin_unlock_bh(&ip6_sk_fl_lock);
558 return -ESRCH;
559
560 case IPV6_FL_A_RENEW:
561 rcu_read_lock_bh();
562 for_each_sk_fl_rcu(np, sfl) {
563 if (sfl->fl->label == freq.flr_label) {
564 err = fl6_renew(sfl->fl, freq.flr_linger, freq.flr_expires);
565 rcu_read_unlock_bh();
566 return err;
567 }
568 }
569 rcu_read_unlock_bh();
570
571 if (freq.flr_share == IPV6_FL_S_NONE &&
572 ns_capable(net->user_ns, CAP_NET_ADMIN)) {
573 fl = fl_lookup(net, freq.flr_label);
574 if (fl) {
575 err = fl6_renew(fl, freq.flr_linger, freq.flr_expires);
576 fl_release(fl);
577 return err;
578 }
579 }
580 return -ESRCH;
581
582 case IPV6_FL_A_GET:
583 if (freq.flr_flags & IPV6_FL_F_REFLECT) {
584 struct net *net = sock_net(sk);
585 if (net->ipv6.sysctl.flowlabel_consistency) {
586 net_info_ratelimited("Can not set IPV6_FL_F_REFLECT if flowlabel_consistency sysctl is enable\n");
587 return -EPERM;
588 }
589
590 if (sk->sk_protocol != IPPROTO_TCP)
591 return -ENOPROTOOPT;
592
593 np->repflow = 1;
594 return 0;
595 }
596
597 if (freq.flr_label & ~IPV6_FLOWLABEL_MASK)
598 return -EINVAL;
599
600 if (net->ipv6.sysctl.flowlabel_state_ranges &&
601 (freq.flr_label & IPV6_FLOWLABEL_STATELESS_FLAG))
602 return -ERANGE;
603
604 fl = fl_create(net, sk, &freq, optval, optlen, &err);
605 if (!fl)
606 return err;
607 sfl1 = kmalloc(sizeof(*sfl1), GFP_KERNEL);
608
609 if (freq.flr_label) {
610 err = -EEXIST;
611 rcu_read_lock_bh();
612 for_each_sk_fl_rcu(np, sfl) {
613 if (sfl->fl->label == freq.flr_label) {
614 if (freq.flr_flags&IPV6_FL_F_EXCL) {
615 rcu_read_unlock_bh();
616 goto done;
617 }
618 fl1 = sfl->fl;
619 atomic_inc(&fl1->users);
620 break;
621 }
622 }
623 rcu_read_unlock_bh();
624
625 if (!fl1)
626 fl1 = fl_lookup(net, freq.flr_label);
627 if (fl1) {
628 recheck:
629 err = -EEXIST;
630 if (freq.flr_flags&IPV6_FL_F_EXCL)
631 goto release;
632 err = -EPERM;
633 if (fl1->share == IPV6_FL_S_EXCL ||
634 fl1->share != fl->share ||
635 ((fl1->share == IPV6_FL_S_PROCESS) &&
636 (fl1->owner.pid == fl->owner.pid)) ||
637 ((fl1->share == IPV6_FL_S_USER) &&
638 uid_eq(fl1->owner.uid, fl->owner.uid)))
639 goto release;
640
641 err = -ENOMEM;
642 if (!sfl1)
643 goto release;
644 if (fl->linger > fl1->linger)
645 fl1->linger = fl->linger;
646 if ((long)(fl->expires - fl1->expires) > 0)
647 fl1->expires = fl->expires;
648 fl_link(np, sfl1, fl1);
649 fl_free(fl);
650 return 0;
651
652 release:
653 fl_release(fl1);
654 goto done;
655 }
656 }
657 err = -ENOENT;
658 if (!(freq.flr_flags&IPV6_FL_F_CREATE))
659 goto done;
660
661 err = -ENOMEM;
662 if (!sfl1)
663 goto done;
664
665 err = mem_check(sk);
666 if (err != 0)
667 goto done;
668
669 fl1 = fl_intern(net, fl, freq.flr_label);
670 if (fl1)
671 goto recheck;
672
673 if (!freq.flr_label) {
674 if (copy_to_user(&((struct in6_flowlabel_req __user *) optval)->flr_label,
675 &fl->label, sizeof(fl->label))) {
676 /* Intentionally ignore fault. */
677 }
678 }
679
680 fl_link(np, sfl1, fl);
681 return 0;
682
683 default:
684 return -EINVAL;
685 }
686
687 done:
688 fl_free(fl);
689 kfree(sfl1);
690 return err;
691 }
692
693 #ifdef CONFIG_PROC_FS
694
695 struct ip6fl_iter_state {
696 struct seq_net_private p;
697 struct pid_namespace *pid_ns;
698 int bucket;
699 };
700
701 #define ip6fl_seq_private(seq) ((struct ip6fl_iter_state *)(seq)->private)
702
703 static struct ip6_flowlabel *ip6fl_get_first(struct seq_file *seq)
704 {
705 struct ip6_flowlabel *fl = NULL;
706 struct ip6fl_iter_state *state = ip6fl_seq_private(seq);
707 struct net *net = seq_file_net(seq);
708
709 for (state->bucket = 0; state->bucket <= FL_HASH_MASK; ++state->bucket) {
710 for_each_fl_rcu(state->bucket, fl) {
711 if (net_eq(fl->fl_net, net))
712 goto out;
713 }
714 }
715 fl = NULL;
716 out:
717 return fl;
718 }
719
720 static struct ip6_flowlabel *ip6fl_get_next(struct seq_file *seq, struct ip6_flowlabel *fl)
721 {
722 struct ip6fl_iter_state *state = ip6fl_seq_private(seq);
723 struct net *net = seq_file_net(seq);
724
725 for_each_fl_continue_rcu(fl) {
726 if (net_eq(fl->fl_net, net))
727 goto out;
728 }
729
730 try_again:
731 if (++state->bucket <= FL_HASH_MASK) {
732 for_each_fl_rcu(state->bucket, fl) {
733 if (net_eq(fl->fl_net, net))
734 goto out;
735 }
736 goto try_again;
737 }
738 fl = NULL;
739
740 out:
741 return fl;
742 }
743
744 static struct ip6_flowlabel *ip6fl_get_idx(struct seq_file *seq, loff_t pos)
745 {
746 struct ip6_flowlabel *fl = ip6fl_get_first(seq);
747 if (fl)
748 while (pos && (fl = ip6fl_get_next(seq, fl)) != NULL)
749 --pos;
750 return pos ? NULL : fl;
751 }
752
753 static void *ip6fl_seq_start(struct seq_file *seq, loff_t *pos)
754 __acquires(RCU)
755 {
756 rcu_read_lock_bh();
757 return *pos ? ip6fl_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
758 }
759
760 static void *ip6fl_seq_next(struct seq_file *seq, void *v, loff_t *pos)
761 {
762 struct ip6_flowlabel *fl;
763
764 if (v == SEQ_START_TOKEN)
765 fl = ip6fl_get_first(seq);
766 else
767 fl = ip6fl_get_next(seq, v);
768 ++*pos;
769 return fl;
770 }
771
772 static void ip6fl_seq_stop(struct seq_file *seq, void *v)
773 __releases(RCU)
774 {
775 rcu_read_unlock_bh();
776 }
777
778 static int ip6fl_seq_show(struct seq_file *seq, void *v)
779 {
780 struct ip6fl_iter_state *state = ip6fl_seq_private(seq);
781 if (v == SEQ_START_TOKEN) {
782 seq_puts(seq, "Label S Owner Users Linger Expires Dst Opt\n");
783 } else {
784 struct ip6_flowlabel *fl = v;
785 seq_printf(seq,
786 "%05X %-1d %-6d %-6d %-6ld %-8ld %pi6 %-4d\n",
787 (unsigned int)ntohl(fl->label),
788 fl->share,
789 ((fl->share == IPV6_FL_S_PROCESS) ?
790 pid_nr_ns(fl->owner.pid, state->pid_ns) :
791 ((fl->share == IPV6_FL_S_USER) ?
792 from_kuid_munged(seq_user_ns(seq), fl->owner.uid) :
793 0)),
794 atomic_read(&fl->users),
795 fl->linger/HZ,
796 (long)(fl->expires - jiffies)/HZ,
797 &fl->dst,
798 fl->opt ? fl->opt->opt_nflen : 0);
799 }
800 return 0;
801 }
802
803 static const struct seq_operations ip6fl_seq_ops = {
804 .start = ip6fl_seq_start,
805 .next = ip6fl_seq_next,
806 .stop = ip6fl_seq_stop,
807 .show = ip6fl_seq_show,
808 };
809
810 static int ip6fl_seq_open(struct inode *inode, struct file *file)
811 {
812 struct seq_file *seq;
813 struct ip6fl_iter_state *state;
814 int err;
815
816 err = seq_open_net(inode, file, &ip6fl_seq_ops,
817 sizeof(struct ip6fl_iter_state));
818
819 if (!err) {
820 seq = file->private_data;
821 state = ip6fl_seq_private(seq);
822 rcu_read_lock();
823 state->pid_ns = get_pid_ns(task_active_pid_ns(current));
824 rcu_read_unlock();
825 }
826 return err;
827 }
828
829 static int ip6fl_seq_release(struct inode *inode, struct file *file)
830 {
831 struct seq_file *seq = file->private_data;
832 struct ip6fl_iter_state *state = ip6fl_seq_private(seq);
833 put_pid_ns(state->pid_ns);
834 return seq_release_net(inode, file);
835 }
836
837 static const struct file_operations ip6fl_seq_fops = {
838 .owner = THIS_MODULE,
839 .open = ip6fl_seq_open,
840 .read = seq_read,
841 .llseek = seq_lseek,
842 .release = ip6fl_seq_release,
843 };
844
845 static int __net_init ip6_flowlabel_proc_init(struct net *net)
846 {
847 if (!proc_create("ip6_flowlabel", S_IRUGO, net->proc_net,
848 &ip6fl_seq_fops))
849 return -ENOMEM;
850 return 0;
851 }
852
853 static void __net_exit ip6_flowlabel_proc_fini(struct net *net)
854 {
855 remove_proc_entry("ip6_flowlabel", net->proc_net);
856 }
857 #else
858 static inline int ip6_flowlabel_proc_init(struct net *net)
859 {
860 return 0;
861 }
862 static inline void ip6_flowlabel_proc_fini(struct net *net)
863 {
864 }
865 #endif
866
867 static void __net_exit ip6_flowlabel_net_exit(struct net *net)
868 {
869 ip6_fl_purge(net);
870 ip6_flowlabel_proc_fini(net);
871 }
872
873 static struct pernet_operations ip6_flowlabel_net_ops = {
874 .init = ip6_flowlabel_proc_init,
875 .exit = ip6_flowlabel_net_exit,
876 };
877
878 int ip6_flowlabel_init(void)
879 {
880 return register_pernet_subsys(&ip6_flowlabel_net_ops);
881 }
882
883 void ip6_flowlabel_cleanup(void)
884 {
885 del_timer(&ip6_fl_gc_timer);
886 unregister_pernet_subsys(&ip6_flowlabel_net_ops);
887 }
Linux with added FPC-III support