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s390: add 'install' target to 'make help'
[linux/fpc-iii.git] / net / ipv6 / ip6_flowlabel.c
blob1f9ebe3cbb4ac042edd0b05754d1fc03cdfe73cd
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 int junk;
376
377 err = -ENOMEM;
378 fl->opt = kmalloc(sizeof(*fl->opt) + olen, GFP_KERNEL);
379 if (!fl->opt)
380 goto done;
381
382 memset(fl->opt, 0, sizeof(*fl->opt));
383 fl->opt->tot_len = sizeof(*fl->opt) + olen;
384 err = -EFAULT;
385 if (copy_from_user(fl->opt+1, optval+CMSG_ALIGN(sizeof(*freq)), olen))
386 goto done;
387
388 msg.msg_controllen = olen;
389 msg.msg_control = (void *)(fl->opt+1);
390 memset(&flowi6, 0, sizeof(flowi6));
391
392 err = ip6_datagram_send_ctl(net, sk, &msg, &flowi6, fl->opt,
393 &junk, &junk, &junk);
394 if (err)
395 goto done;
396 err = -EINVAL;
397 if (fl->opt->opt_flen)
398 goto done;
399 if (fl->opt->opt_nflen == 0) {
400 kfree(fl->opt);
401 fl->opt = NULL;
402 }
403 }
404
405 fl->fl_net = net;
406 fl->expires = jiffies;
407 err = fl6_renew(fl, freq->flr_linger, freq->flr_expires);
408 if (err)
409 goto done;
410 fl->share = freq->flr_share;
411 addr_type = ipv6_addr_type(&freq->flr_dst);
412 if ((addr_type & IPV6_ADDR_MAPPED) ||
413 addr_type == IPV6_ADDR_ANY) {
414 err = -EINVAL;
415 goto done;
416 }
417 fl->dst = freq->flr_dst;
418 atomic_set(&fl->users, 1);
419 switch (fl->share) {
420 case IPV6_FL_S_EXCL:
421 case IPV6_FL_S_ANY:
422 break;
423 case IPV6_FL_S_PROCESS:
424 fl->owner.pid = get_task_pid(current, PIDTYPE_PID);
425 break;
426 case IPV6_FL_S_USER:
427 fl->owner.uid = current_euid();
428 break;
429 default:
430 err = -EINVAL;
431 goto done;
432 }
433 return fl;
434
435 done:
436 fl_free(fl);
437 *err_p = err;
438 return NULL;
439 }
440
441 static int mem_check(struct sock *sk)
442 {
443 struct ipv6_pinfo *np = inet6_sk(sk);
444 struct ipv6_fl_socklist *sfl;
445 int room = FL_MAX_SIZE - atomic_read(&fl_size);
446 int count = 0;
447
448 if (room > FL_MAX_SIZE - FL_MAX_PER_SOCK)
449 return 0;
450
451 rcu_read_lock_bh();
452 for_each_sk_fl_rcu(np, sfl)
453 count++;
454 rcu_read_unlock_bh();
455
456 if (room <= 0 ||
457 ((count >= FL_MAX_PER_SOCK ||
458 (count > 0 && room < FL_MAX_SIZE/2) || room < FL_MAX_SIZE/4) &&
459 !capable(CAP_NET_ADMIN)))
460 return -ENOBUFS;
461
462 return 0;
463 }
464
465 static inline void fl_link(struct ipv6_pinfo *np, struct ipv6_fl_socklist *sfl,
466 struct ip6_flowlabel *fl)
467 {
468 spin_lock_bh(&ip6_sk_fl_lock);
469 sfl->fl = fl;
470 sfl->next = np->ipv6_fl_list;
471 rcu_assign_pointer(np->ipv6_fl_list, sfl);
472 spin_unlock_bh(&ip6_sk_fl_lock);
473 }
474
475 int ipv6_flowlabel_opt_get(struct sock *sk, struct in6_flowlabel_req *freq,
476 int flags)
477 {
478 struct ipv6_pinfo *np = inet6_sk(sk);
479 struct ipv6_fl_socklist *sfl;
480
481 if (flags & IPV6_FL_F_REMOTE) {
482 freq->flr_label = np->rcv_flowinfo & IPV6_FLOWLABEL_MASK;
483 return 0;
484 }
485
486 if (np->repflow) {
487 freq->flr_label = np->flow_label;
488 return 0;
489 }
490
491 rcu_read_lock_bh();
492
493 for_each_sk_fl_rcu(np, sfl) {
494 if (sfl->fl->label == (np->flow_label & IPV6_FLOWLABEL_MASK)) {
495 spin_lock_bh(&ip6_fl_lock);
496 freq->flr_label = sfl->fl->label;
497 freq->flr_dst = sfl->fl->dst;
498 freq->flr_share = sfl->fl->share;
499 freq->flr_expires = (sfl->fl->expires - jiffies) / HZ;
500 freq->flr_linger = sfl->fl->linger / HZ;
501
502 spin_unlock_bh(&ip6_fl_lock);
503 rcu_read_unlock_bh();
504 return 0;
505 }
506 }
507 rcu_read_unlock_bh();
508
509 return -ENOENT;
510 }
511
512 int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen)
513 {
514 int uninitialized_var(err);
515 struct net *net = sock_net(sk);
516 struct ipv6_pinfo *np = inet6_sk(sk);
517 struct in6_flowlabel_req freq;
518 struct ipv6_fl_socklist *sfl1 = NULL;
519 struct ipv6_fl_socklist *sfl;
520 struct ipv6_fl_socklist __rcu **sflp;
521 struct ip6_flowlabel *fl, *fl1 = NULL;
522
523
524 if (optlen < sizeof(freq))
525 return -EINVAL;
526
527 if (copy_from_user(&freq, optval, sizeof(freq)))
528 return -EFAULT;
529
530 switch (freq.flr_action) {
531 case IPV6_FL_A_PUT:
532 if (freq.flr_flags & IPV6_FL_F_REFLECT) {
533 if (sk->sk_protocol != IPPROTO_TCP)
534 return -ENOPROTOOPT;
535 if (!np->repflow)
536 return -ESRCH;
537 np->flow_label = 0;
538 np->repflow = 0;
539 return 0;
540 }
541 spin_lock_bh(&ip6_sk_fl_lock);
542 for (sflp = &np->ipv6_fl_list;
543 (sfl = rcu_dereference(*sflp)) != NULL;
544 sflp = &sfl->next) {
545 if (sfl->fl->label == freq.flr_label) {
546 if (freq.flr_label == (np->flow_label&IPV6_FLOWLABEL_MASK))
547 np->flow_label &= ~IPV6_FLOWLABEL_MASK;
548 *sflp = rcu_dereference(sfl->next);
549 spin_unlock_bh(&ip6_sk_fl_lock);
550 fl_release(sfl->fl);
551 kfree_rcu(sfl, rcu);
552 return 0;
553 }
554 }
555 spin_unlock_bh(&ip6_sk_fl_lock);
556 return -ESRCH;
557
558 case IPV6_FL_A_RENEW:
559 rcu_read_lock_bh();
560 for_each_sk_fl_rcu(np, sfl) {
561 if (sfl->fl->label == freq.flr_label) {
562 err = fl6_renew(sfl->fl, freq.flr_linger, freq.flr_expires);
563 rcu_read_unlock_bh();
564 return err;
565 }
566 }
567 rcu_read_unlock_bh();
568
569 if (freq.flr_share == IPV6_FL_S_NONE &&
570 ns_capable(net->user_ns, CAP_NET_ADMIN)) {
571 fl = fl_lookup(net, freq.flr_label);
572 if (fl) {
573 err = fl6_renew(fl, freq.flr_linger, freq.flr_expires);
574 fl_release(fl);
575 return err;
576 }
577 }
578 return -ESRCH;
579
580 case IPV6_FL_A_GET:
581 if (freq.flr_flags & IPV6_FL_F_REFLECT) {
582 struct net *net = sock_net(sk);
583 if (net->ipv6.sysctl.flowlabel_consistency) {
584 net_info_ratelimited("Can not set IPV6_FL_F_REFLECT if flowlabel_consistency sysctl is enable\n");
585 return -EPERM;
586 }
587
588 if (sk->sk_protocol != IPPROTO_TCP)
589 return -ENOPROTOOPT;
590
591 np->repflow = 1;
592 return 0;
593 }
594
595 if (freq.flr_label & ~IPV6_FLOWLABEL_MASK)
596 return -EINVAL;
597
598 if (net->ipv6.sysctl.flowlabel_state_ranges &&
599 (freq.flr_label & IPV6_FLOWLABEL_STATELESS_FLAG))
600 return -ERANGE;
601
602 fl = fl_create(net, sk, &freq, optval, optlen, &err);
603 if (!fl)
604 return err;
605 sfl1 = kmalloc(sizeof(*sfl1), GFP_KERNEL);
606
607 if (freq.flr_label) {
608 err = -EEXIST;
609 rcu_read_lock_bh();
610 for_each_sk_fl_rcu(np, sfl) {
611 if (sfl->fl->label == freq.flr_label) {
612 if (freq.flr_flags&IPV6_FL_F_EXCL) {
613 rcu_read_unlock_bh();
614 goto done;
615 }
616 fl1 = sfl->fl;
617 atomic_inc(&fl1->users);
618 break;
619 }
620 }
621 rcu_read_unlock_bh();
622
623 if (!fl1)
624 fl1 = fl_lookup(net, freq.flr_label);
625 if (fl1) {
626 recheck:
627 err = -EEXIST;
628 if (freq.flr_flags&IPV6_FL_F_EXCL)
629 goto release;
630 err = -EPERM;
631 if (fl1->share == IPV6_FL_S_EXCL ||
632 fl1->share != fl->share ||
633 ((fl1->share == IPV6_FL_S_PROCESS) &&
634 (fl1->owner.pid == fl->owner.pid)) ||
635 ((fl1->share == IPV6_FL_S_USER) &&
636 uid_eq(fl1->owner.uid, fl->owner.uid)))
637 goto release;
638
639 err = -ENOMEM;
640 if (!sfl1)
641 goto release;
642 if (fl->linger > fl1->linger)
643 fl1->linger = fl->linger;
644 if ((long)(fl->expires - fl1->expires) > 0)
645 fl1->expires = fl->expires;
646 fl_link(np, sfl1, fl1);
647 fl_free(fl);
648 return 0;
649
650 release:
651 fl_release(fl1);
652 goto done;
653 }
654 }
655 err = -ENOENT;
656 if (!(freq.flr_flags&IPV6_FL_F_CREATE))
657 goto done;
658
659 err = -ENOMEM;
660 if (!sfl1)
661 goto done;
662
663 err = mem_check(sk);
664 if (err != 0)
665 goto done;
666
667 fl1 = fl_intern(net, fl, freq.flr_label);
668 if (fl1)
669 goto recheck;
670
671 if (!freq.flr_label) {
672 if (copy_to_user(&((struct in6_flowlabel_req __user *) optval)->flr_label,
673 &fl->label, sizeof(fl->label))) {
674 /* Intentionally ignore fault. */
675 }
676 }
677
678 fl_link(np, sfl1, fl);
679 return 0;
680
681 default:
682 return -EINVAL;
683 }
684
685 done:
686 fl_free(fl);
687 kfree(sfl1);
688 return err;
689 }
690
691 #ifdef CONFIG_PROC_FS
692
693 struct ip6fl_iter_state {
694 struct seq_net_private p;
695 struct pid_namespace *pid_ns;
696 int bucket;
697 };
698
699 #define ip6fl_seq_private(seq) ((struct ip6fl_iter_state *)(seq)->private)
700
701 static struct ip6_flowlabel *ip6fl_get_first(struct seq_file *seq)
702 {
703 struct ip6_flowlabel *fl = NULL;
704 struct ip6fl_iter_state *state = ip6fl_seq_private(seq);
705 struct net *net = seq_file_net(seq);
706
707 for (state->bucket = 0; state->bucket <= FL_HASH_MASK; ++state->bucket) {
708 for_each_fl_rcu(state->bucket, fl) {
709 if (net_eq(fl->fl_net, net))
710 goto out;
711 }
712 }
713 fl = NULL;
714 out:
715 return fl;
716 }
717
718 static struct ip6_flowlabel *ip6fl_get_next(struct seq_file *seq, struct ip6_flowlabel *fl)
719 {
720 struct ip6fl_iter_state *state = ip6fl_seq_private(seq);
721 struct net *net = seq_file_net(seq);
722
723 for_each_fl_continue_rcu(fl) {
724 if (net_eq(fl->fl_net, net))
725 goto out;
726 }
727
728 try_again:
729 if (++state->bucket <= FL_HASH_MASK) {
730 for_each_fl_rcu(state->bucket, fl) {
731 if (net_eq(fl->fl_net, net))
732 goto out;
733 }
734 goto try_again;
735 }
736 fl = NULL;
737
738 out:
739 return fl;
740 }
741
742 static struct ip6_flowlabel *ip6fl_get_idx(struct seq_file *seq, loff_t pos)
743 {
744 struct ip6_flowlabel *fl = ip6fl_get_first(seq);
745 if (fl)
746 while (pos && (fl = ip6fl_get_next(seq, fl)) != NULL)
747 --pos;
748 return pos ? NULL : fl;
749 }
750
751 static void *ip6fl_seq_start(struct seq_file *seq, loff_t *pos)
752 __acquires(RCU)
753 {
754 rcu_read_lock_bh();
755 return *pos ? ip6fl_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
756 }
757
758 static void *ip6fl_seq_next(struct seq_file *seq, void *v, loff_t *pos)
759 {
760 struct ip6_flowlabel *fl;
761
762 if (v == SEQ_START_TOKEN)
763 fl = ip6fl_get_first(seq);
764 else
765 fl = ip6fl_get_next(seq, v);
766 ++*pos;
767 return fl;
768 }
769
770 static void ip6fl_seq_stop(struct seq_file *seq, void *v)
771 __releases(RCU)
772 {
773 rcu_read_unlock_bh();
774 }
775
776 static int ip6fl_seq_show(struct seq_file *seq, void *v)
777 {
778 struct ip6fl_iter_state *state = ip6fl_seq_private(seq);
779 if (v == SEQ_START_TOKEN) {
780 seq_puts(seq, "Label S Owner Users Linger Expires Dst Opt\n");
781 } else {
782 struct ip6_flowlabel *fl = v;
783 seq_printf(seq,
784 "%05X %-1d %-6d %-6d %-6ld %-8ld %pi6 %-4d\n",
785 (unsigned int)ntohl(fl->label),
786 fl->share,
787 ((fl->share == IPV6_FL_S_PROCESS) ?
788 pid_nr_ns(fl->owner.pid, state->pid_ns) :
789 ((fl->share == IPV6_FL_S_USER) ?
790 from_kuid_munged(seq_user_ns(seq), fl->owner.uid) :
791 0)),
792 atomic_read(&fl->users),
793 fl->linger/HZ,
794 (long)(fl->expires - jiffies)/HZ,
795 &fl->dst,
796 fl->opt ? fl->opt->opt_nflen : 0);
797 }
798 return 0;
799 }
800
801 static const struct seq_operations ip6fl_seq_ops = {
802 .start = ip6fl_seq_start,
803 .next = ip6fl_seq_next,
804 .stop = ip6fl_seq_stop,
805 .show = ip6fl_seq_show,
806 };
807
808 static int ip6fl_seq_open(struct inode *inode, struct file *file)
809 {
810 struct seq_file *seq;
811 struct ip6fl_iter_state *state;
812 int err;
813
814 err = seq_open_net(inode, file, &ip6fl_seq_ops,
815 sizeof(struct ip6fl_iter_state));
816
817 if (!err) {
818 seq = file->private_data;
819 state = ip6fl_seq_private(seq);
820 rcu_read_lock();
821 state->pid_ns = get_pid_ns(task_active_pid_ns(current));
822 rcu_read_unlock();
823 }
824 return err;
825 }
826
827 static int ip6fl_seq_release(struct inode *inode, struct file *file)
828 {
829 struct seq_file *seq = file->private_data;
830 struct ip6fl_iter_state *state = ip6fl_seq_private(seq);
831 put_pid_ns(state->pid_ns);
832 return seq_release_net(inode, file);
833 }
834
835 static const struct file_operations ip6fl_seq_fops = {
836 .owner = THIS_MODULE,
837 .open = ip6fl_seq_open,
838 .read = seq_read,
839 .llseek = seq_lseek,
840 .release = ip6fl_seq_release,
841 };
842
843 static int __net_init ip6_flowlabel_proc_init(struct net *net)
844 {
845 if (!proc_create("ip6_flowlabel", S_IRUGO, net->proc_net,
846 &ip6fl_seq_fops))
847 return -ENOMEM;
848 return 0;
849 }
850
851 static void __net_exit ip6_flowlabel_proc_fini(struct net *net)
852 {
853 remove_proc_entry("ip6_flowlabel", net->proc_net);
854 }
855 #else
856 static inline int ip6_flowlabel_proc_init(struct net *net)
857 {
858 return 0;
859 }
860 static inline void ip6_flowlabel_proc_fini(struct net *net)
861 {
862 }
863 #endif
864
865 static void __net_exit ip6_flowlabel_net_exit(struct net *net)
866 {
867 ip6_fl_purge(net);
868 ip6_flowlabel_proc_fini(net);
869 }
870
871 static struct pernet_operations ip6_flowlabel_net_ops = {
872 .init = ip6_flowlabel_proc_init,
873 .exit = ip6_flowlabel_net_exit,
874 };
875
876 int ip6_flowlabel_init(void)
877 {
878 return register_pernet_subsys(&ip6_flowlabel_net_ops);
879 }
880
881 void ip6_flowlabel_cleanup(void)
882 {
883 del_timer(&ip6_fl_gc_timer);
884 unregister_pernet_subsys(&ip6_flowlabel_net_ops);
885 }
Linux with added FPC-III support