blob: 4566dbd916d36a346bdf49b0f1b2b9e5c4e866e3 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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
Randy Dunlap4fc268d2006-01-11 12:17:47 -080012#include <linux/capability.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070013#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>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090023#include <linux/slab.h>
Paul Gortmakerbc3b2d72011-07-15 11:47:34 -040024#include <linux/export.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070025
Eric W. Biederman457c4cb2007-09-12 12:01:34 +020026#include <net/net_namespace.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070027#include <net/sock.h>
28
29#include <net/ipv6.h>
30#include <net/ndisc.h>
31#include <net/protocol.h>
32#include <net/ip6_route.h>
33#include <net/addrconf.h>
34#include <net/rawv6.h>
35#include <net/icmp.h>
36#include <net/transp_v6.h>
37
38#include <asm/uaccess.h>
39
40#define FL_MIN_LINGER 6 /* Minimal linger. It is set to 6sec specified
41 in old IPv6 RFC. Well, it was reasonable value.
42 */
43#define FL_MAX_LINGER 60 /* Maximal linger timeout */
44
45/* FL hash table */
46
47#define FL_MAX_PER_SOCK 32
48#define FL_MAX_SIZE 4096
49#define FL_HASH_MASK 255
50#define FL_HASH(l) (ntohl(l)&FL_HASH_MASK)
51
52static atomic_t fl_size = ATOMIC_INIT(0);
53static struct ip6_flowlabel *fl_ht[FL_HASH_MASK+1];
54
55static void ip6_fl_gc(unsigned long dummy);
Ingo Molnar8d06afa2005-09-09 13:10:40 -070056static DEFINE_TIMER(ip6_fl_gc_timer, ip6_fl_gc, 0, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -070057
58/* FL hash table lock: it protects only of GC */
59
60static DEFINE_RWLOCK(ip6_fl_lock);
61
62/* Big socket sock */
63
64static DEFINE_RWLOCK(ip6_sk_fl_lock);
65
66
Benjamin Thery60e8fbc2008-03-26 16:53:08 -070067static inline struct ip6_flowlabel *__fl_lookup(struct net *net, __be32 label)
Linus Torvalds1da177e2005-04-16 15:20:36 -070068{
69 struct ip6_flowlabel *fl;
70
71 for (fl=fl_ht[FL_HASH(label)]; fl; fl = fl->next) {
Octavian Purdila09ad9bc2009-11-25 15:14:13 -080072 if (fl->label == label && net_eq(fl->fl_net, net))
Linus Torvalds1da177e2005-04-16 15:20:36 -070073 return fl;
74 }
75 return NULL;
76}
77
Benjamin Thery60e8fbc2008-03-26 16:53:08 -070078static struct ip6_flowlabel *fl_lookup(struct net *net, __be32 label)
Linus Torvalds1da177e2005-04-16 15:20:36 -070079{
80 struct ip6_flowlabel *fl;
81
82 read_lock_bh(&ip6_fl_lock);
Benjamin Thery60e8fbc2008-03-26 16:53:08 -070083 fl = __fl_lookup(net, label);
Linus Torvalds1da177e2005-04-16 15:20:36 -070084 if (fl)
85 atomic_inc(&fl->users);
86 read_unlock_bh(&ip6_fl_lock);
87 return fl;
88}
89
90
91static void fl_free(struct ip6_flowlabel *fl)
92{
Benjamin Thery60e8fbc2008-03-26 16:53:08 -070093 if (fl) {
94 release_net(fl->fl_net);
Linus Torvalds1da177e2005-04-16 15:20:36 -070095 kfree(fl->opt);
Benjamin Thery60e8fbc2008-03-26 16:53:08 -070096 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070097 kfree(fl);
98}
99
100static void fl_release(struct ip6_flowlabel *fl)
101{
102 write_lock_bh(&ip6_fl_lock);
103
104 fl->lastuse = jiffies;
105 if (atomic_dec_and_test(&fl->users)) {
106 unsigned long ttd = fl->lastuse + fl->linger;
107 if (time_after(ttd, fl->expires))
108 fl->expires = ttd;
109 ttd = fl->expires;
110 if (fl->opt && fl->share == IPV6_FL_S_EXCL) {
111 struct ipv6_txoptions *opt = fl->opt;
112 fl->opt = NULL;
113 kfree(opt);
114 }
115 if (!timer_pending(&ip6_fl_gc_timer) ||
116 time_after(ip6_fl_gc_timer.expires, ttd))
117 mod_timer(&ip6_fl_gc_timer, ttd);
118 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119 write_unlock_bh(&ip6_fl_lock);
120}
121
122static void ip6_fl_gc(unsigned long dummy)
123{
124 int i;
125 unsigned long now = jiffies;
126 unsigned long sched = 0;
127
128 write_lock(&ip6_fl_lock);
129
130 for (i=0; i<=FL_HASH_MASK; i++) {
131 struct ip6_flowlabel *fl, **flp;
132 flp = &fl_ht[i];
133 while ((fl=*flp) != NULL) {
134 if (atomic_read(&fl->users) == 0) {
135 unsigned long ttd = fl->lastuse + fl->linger;
136 if (time_after(ttd, fl->expires))
137 fl->expires = ttd;
138 ttd = fl->expires;
139 if (time_after_eq(now, ttd)) {
140 *flp = fl->next;
141 fl_free(fl);
142 atomic_dec(&fl_size);
143 continue;
144 }
145 if (!sched || time_before(ttd, sched))
146 sched = ttd;
147 }
148 flp = &fl->next;
149 }
150 }
151 if (!sched && atomic_read(&fl_size))
152 sched = now + FL_MAX_LINGER;
153 if (sched) {
Benjamin Thery60e8fbc2008-03-26 16:53:08 -0700154 mod_timer(&ip6_fl_gc_timer, sched);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155 }
156 write_unlock(&ip6_fl_lock);
157}
158
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +0000159static void __net_exit ip6_fl_purge(struct net *net)
Benjamin Thery60e8fbc2008-03-26 16:53:08 -0700160{
161 int i;
162
163 write_lock(&ip6_fl_lock);
164 for (i = 0; i <= FL_HASH_MASK; i++) {
165 struct ip6_flowlabel *fl, **flp;
166 flp = &fl_ht[i];
167 while ((fl = *flp) != NULL) {
Octavian Purdila09ad9bc2009-11-25 15:14:13 -0800168 if (net_eq(fl->fl_net, net) &&
169 atomic_read(&fl->users) == 0) {
Benjamin Thery60e8fbc2008-03-26 16:53:08 -0700170 *flp = fl->next;
171 fl_free(fl);
172 atomic_dec(&fl_size);
173 continue;
174 }
175 flp = &fl->next;
176 }
177 }
178 write_unlock(&ip6_fl_lock);
179}
180
181static struct ip6_flowlabel *fl_intern(struct net *net,
182 struct ip6_flowlabel *fl, __be32 label)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183{
Pavel Emelyanov78c2e502007-10-18 05:18:56 -0700184 struct ip6_flowlabel *lfl;
185
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186 fl->label = label & IPV6_FLOWLABEL_MASK;
187
188 write_lock_bh(&ip6_fl_lock);
189 if (label == 0) {
190 for (;;) {
191 fl->label = htonl(net_random())&IPV6_FLOWLABEL_MASK;
192 if (fl->label) {
Benjamin Thery60e8fbc2008-03-26 16:53:08 -0700193 lfl = __fl_lookup(net, fl->label);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194 if (lfl == NULL)
195 break;
196 }
197 }
Pavel Emelyanov78c2e502007-10-18 05:18:56 -0700198 } else {
199 /*
200 * we dropper the ip6_fl_lock, so this entry could reappear
201 * and we need to recheck with it.
202 *
203 * OTOH no need to search the active socket first, like it is
204 * done in ipv6_flowlabel_opt - sock is locked, so new entry
205 * with the same label can only appear on another sock
206 */
Benjamin Thery60e8fbc2008-03-26 16:53:08 -0700207 lfl = __fl_lookup(net, fl->label);
Pavel Emelyanov78c2e502007-10-18 05:18:56 -0700208 if (lfl != NULL) {
209 atomic_inc(&lfl->users);
210 write_unlock_bh(&ip6_fl_lock);
211 return lfl;
212 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213 }
214
215 fl->lastuse = jiffies;
216 fl->next = fl_ht[FL_HASH(fl->label)];
217 fl_ht[FL_HASH(fl->label)] = fl;
218 atomic_inc(&fl_size);
219 write_unlock_bh(&ip6_fl_lock);
Pavel Emelyanov78c2e502007-10-18 05:18:56 -0700220 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221}
222
223
224
225/* Socket flowlabel lists */
226
Al Viro90bcaf72006-11-08 00:25:17 -0800227struct ip6_flowlabel * fl6_sock_lookup(struct sock *sk, __be32 label)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228{
229 struct ipv6_fl_socklist *sfl;
230 struct ipv6_pinfo *np = inet6_sk(sk);
231
232 label &= IPV6_FLOWLABEL_MASK;
233
Pavel Emelyanovbd0bf572007-10-18 05:15:57 -0700234 read_lock_bh(&ip6_sk_fl_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235 for (sfl=np->ipv6_fl_list; sfl; sfl = sfl->next) {
236 struct ip6_flowlabel *fl = sfl->fl;
237 if (fl->label == label) {
238 fl->lastuse = jiffies;
239 atomic_inc(&fl->users);
Pavel Emelyanov52f095e2007-10-18 05:38:48 -0700240 read_unlock_bh(&ip6_sk_fl_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241 return fl;
242 }
243 }
Pavel Emelyanovbd0bf572007-10-18 05:15:57 -0700244 read_unlock_bh(&ip6_sk_fl_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245 return NULL;
246}
247
Arnaldo Carvalho de Melo3cf3dc62005-12-13 23:23:20 -0800248EXPORT_SYMBOL_GPL(fl6_sock_lookup);
249
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250void fl6_free_socklist(struct sock *sk)
251{
252 struct ipv6_pinfo *np = inet6_sk(sk);
253 struct ipv6_fl_socklist *sfl;
254
255 while ((sfl = np->ipv6_fl_list) != NULL) {
256 np->ipv6_fl_list = sfl->next;
257 fl_release(sfl->fl);
258 kfree(sfl);
259 }
260}
261
262/* Service routines */
263
264
265/*
266 It is the only difficult place. flowlabel enforces equal headers
267 before and including routing header, however user may supply options
268 following rthdr.
269 */
270
271struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions * opt_space,
272 struct ip6_flowlabel * fl,
273 struct ipv6_txoptions * fopt)
274{
YOSHIFUJI Hideakidf9890c2005-11-20 12:23:18 +0900275 struct ipv6_txoptions * fl_opt = fl->opt;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900276
YOSHIFUJI Hideakidf9890c2005-11-20 12:23:18 +0900277 if (fopt == NULL || fopt->opt_flen == 0)
278 return fl_opt;
YOSHIFUJI Hideaki1ab14572007-02-09 23:24:49 +0900279
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280 if (fl_opt != NULL) {
281 opt_space->hopopt = fl_opt->hopopt;
YOSHIFUJI Hideakidf9890c2005-11-20 12:23:18 +0900282 opt_space->dst0opt = fl_opt->dst0opt;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283 opt_space->srcrt = fl_opt->srcrt;
284 opt_space->opt_nflen = fl_opt->opt_nflen;
285 } else {
286 if (fopt->opt_nflen == 0)
287 return fopt;
288 opt_space->hopopt = NULL;
289 opt_space->dst0opt = NULL;
290 opt_space->srcrt = NULL;
291 opt_space->opt_nflen = 0;
292 }
293 opt_space->dst1opt = fopt->dst1opt;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294 opt_space->opt_flen = fopt->opt_flen;
295 return opt_space;
296}
297
298static unsigned long check_linger(unsigned long ttl)
299{
300 if (ttl < FL_MIN_LINGER)
301 return FL_MIN_LINGER*HZ;
302 if (ttl > FL_MAX_LINGER && !capable(CAP_NET_ADMIN))
303 return 0;
304 return ttl*HZ;
305}
306
307static int fl6_renew(struct ip6_flowlabel *fl, unsigned long linger, unsigned long expires)
308{
309 linger = check_linger(linger);
310 if (!linger)
311 return -EPERM;
312 expires = check_linger(expires);
313 if (!expires)
314 return -EPERM;
315 fl->lastuse = jiffies;
316 if (time_before(fl->linger, linger))
317 fl->linger = linger;
318 if (time_before(expires, fl->linger))
319 expires = fl->linger;
320 if (time_before(fl->expires, fl->lastuse + expires))
321 fl->expires = fl->lastuse + expires;
322 return 0;
323}
324
325static struct ip6_flowlabel *
Maciej Żenczykowskiec0506d2011-08-28 12:35:31 +0000326fl_create(struct net *net, struct sock *sk, struct in6_flowlabel_req *freq,
327 char __user *optval, int optlen, int *err_p)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328{
David S. Miller684de402009-02-06 00:49:55 -0800329 struct ip6_flowlabel *fl = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330 int olen;
331 int addr_type;
332 int err;
333
David S. Miller684de402009-02-06 00:49:55 -0800334 olen = optlen - CMSG_ALIGN(sizeof(*freq));
335 err = -EINVAL;
336 if (olen > 64 * 1024)
337 goto done;
338
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339 err = -ENOMEM;
Ingo Oeser0c600ed2006-03-20 23:01:32 -0800340 fl = kzalloc(sizeof(*fl), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341 if (fl == NULL)
342 goto done;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344 if (olen > 0) {
345 struct msghdr msg;
David S. Miller4c9483b2011-03-12 16:22:43 -0500346 struct flowi6 flowi6;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347 int junk;
348
349 err = -ENOMEM;
350 fl->opt = kmalloc(sizeof(*fl->opt) + olen, GFP_KERNEL);
351 if (fl->opt == NULL)
352 goto done;
353
354 memset(fl->opt, 0, sizeof(*fl->opt));
355 fl->opt->tot_len = sizeof(*fl->opt) + olen;
356 err = -EFAULT;
357 if (copy_from_user(fl->opt+1, optval+CMSG_ALIGN(sizeof(*freq)), olen))
358 goto done;
359
360 msg.msg_controllen = olen;
361 msg.msg_control = (void*)(fl->opt+1);
David S. Miller4c9483b2011-03-12 16:22:43 -0500362 memset(&flowi6, 0, sizeof(flowi6));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363
Maciej Żenczykowskiec0506d2011-08-28 12:35:31 +0000364 err = datagram_send_ctl(net, sk, &msg, &flowi6, fl->opt, &junk,
Brian Haley13b52cd2010-04-23 11:26:08 +0000365 &junk, &junk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366 if (err)
367 goto done;
368 err = -EINVAL;
369 if (fl->opt->opt_flen)
370 goto done;
371 if (fl->opt->opt_nflen == 0) {
372 kfree(fl->opt);
373 fl->opt = NULL;
374 }
375 }
376
Benjamin Thery60e8fbc2008-03-26 16:53:08 -0700377 fl->fl_net = hold_net(net);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378 fl->expires = jiffies;
379 err = fl6_renew(fl, freq->flr_linger, freq->flr_expires);
380 if (err)
381 goto done;
382 fl->share = freq->flr_share;
383 addr_type = ipv6_addr_type(&freq->flr_dst);
Joe Perches35700212009-11-24 14:52:52 -0800384 if ((addr_type & IPV6_ADDR_MAPPED) ||
385 addr_type == IPV6_ADDR_ANY) {
James Morrisc6817e42006-10-30 18:56:06 -0800386 err = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387 goto done;
James Morrisc6817e42006-10-30 18:56:06 -0800388 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389 ipv6_addr_copy(&fl->dst, &freq->flr_dst);
390 atomic_set(&fl->users, 1);
391 switch (fl->share) {
392 case IPV6_FL_S_EXCL:
393 case IPV6_FL_S_ANY:
394 break;
395 case IPV6_FL_S_PROCESS:
396 fl->owner = current->pid;
397 break;
398 case IPV6_FL_S_USER:
David Howellsf82b35902008-11-14 10:39:07 +1100399 fl->owner = current_euid();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400 break;
401 default:
402 err = -EINVAL;
403 goto done;
404 }
405 return fl;
406
407done:
408 fl_free(fl);
409 *err_p = err;
410 return NULL;
411}
412
413static int mem_check(struct sock *sk)
414{
415 struct ipv6_pinfo *np = inet6_sk(sk);
416 struct ipv6_fl_socklist *sfl;
417 int room = FL_MAX_SIZE - atomic_read(&fl_size);
418 int count = 0;
419
420 if (room > FL_MAX_SIZE - FL_MAX_PER_SOCK)
421 return 0;
422
423 for (sfl = np->ipv6_fl_list; sfl; sfl = sfl->next)
424 count++;
425
426 if (room <= 0 ||
427 ((count >= FL_MAX_PER_SOCK ||
Joe Perches35700212009-11-24 14:52:52 -0800428 (count > 0 && room < FL_MAX_SIZE/2) || room < FL_MAX_SIZE/4) &&
429 !capable(CAP_NET_ADMIN)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430 return -ENOBUFS;
431
432 return 0;
433}
434
435static int ipv6_hdr_cmp(struct ipv6_opt_hdr *h1, struct ipv6_opt_hdr *h2)
436{
437 if (h1 == h2)
438 return 0;
439 if (h1 == NULL || h2 == NULL)
440 return 1;
441 if (h1->hdrlen != h2->hdrlen)
442 return 1;
443 return memcmp(h1+1, h2+1, ((h1->hdrlen+1)<<3) - sizeof(*h1));
444}
445
446static int ipv6_opt_cmp(struct ipv6_txoptions *o1, struct ipv6_txoptions *o2)
447{
448 if (o1 == o2)
449 return 0;
450 if (o1 == NULL || o2 == NULL)
451 return 1;
452 if (o1->opt_nflen != o2->opt_nflen)
453 return 1;
454 if (ipv6_hdr_cmp(o1->hopopt, o2->hopopt))
455 return 1;
456 if (ipv6_hdr_cmp(o1->dst0opt, o2->dst0opt))
457 return 1;
458 if (ipv6_hdr_cmp((struct ipv6_opt_hdr *)o1->srcrt, (struct ipv6_opt_hdr *)o2->srcrt))
459 return 1;
460 return 0;
461}
462
Pavel Emelyanov04028042007-10-18 05:14:58 -0700463static inline void fl_link(struct ipv6_pinfo *np, struct ipv6_fl_socklist *sfl,
464 struct ip6_flowlabel *fl)
465{
466 write_lock_bh(&ip6_sk_fl_lock);
467 sfl->fl = fl;
468 sfl->next = np->ipv6_fl_list;
469 np->ipv6_fl_list = sfl;
470 write_unlock_bh(&ip6_sk_fl_lock);
471}
472
Linus Torvalds1da177e2005-04-16 15:20:36 -0700473int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen)
474{
Ingo Molnar55205d42008-11-25 16:50:30 -0800475 int uninitialized_var(err);
Benjamin Thery60e8fbc2008-03-26 16:53:08 -0700476 struct net *net = sock_net(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477 struct ipv6_pinfo *np = inet6_sk(sk);
478 struct in6_flowlabel_req freq;
479 struct ipv6_fl_socklist *sfl1=NULL;
480 struct ipv6_fl_socklist *sfl, **sflp;
Pavel Emelyanov78c2e502007-10-18 05:18:56 -0700481 struct ip6_flowlabel *fl, *fl1 = NULL;
482
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483
484 if (optlen < sizeof(freq))
485 return -EINVAL;
486
487 if (copy_from_user(&freq, optval, sizeof(freq)))
488 return -EFAULT;
489
490 switch (freq.flr_action) {
491 case IPV6_FL_A_PUT:
492 write_lock_bh(&ip6_sk_fl_lock);
493 for (sflp = &np->ipv6_fl_list; (sfl=*sflp)!=NULL; sflp = &sfl->next) {
494 if (sfl->fl->label == freq.flr_label) {
495 if (freq.flr_label == (np->flow_label&IPV6_FLOWLABEL_MASK))
496 np->flow_label &= ~IPV6_FLOWLABEL_MASK;
497 *sflp = sfl->next;
498 write_unlock_bh(&ip6_sk_fl_lock);
499 fl_release(sfl->fl);
500 kfree(sfl);
501 return 0;
502 }
503 }
504 write_unlock_bh(&ip6_sk_fl_lock);
505 return -ESRCH;
506
507 case IPV6_FL_A_RENEW:
508 read_lock_bh(&ip6_sk_fl_lock);
509 for (sfl = np->ipv6_fl_list; sfl; sfl = sfl->next) {
510 if (sfl->fl->label == freq.flr_label) {
511 err = fl6_renew(sfl->fl, freq.flr_linger, freq.flr_expires);
512 read_unlock_bh(&ip6_sk_fl_lock);
513 return err;
514 }
515 }
516 read_unlock_bh(&ip6_sk_fl_lock);
517
518 if (freq.flr_share == IPV6_FL_S_NONE && capable(CAP_NET_ADMIN)) {
Benjamin Thery60e8fbc2008-03-26 16:53:08 -0700519 fl = fl_lookup(net, freq.flr_label);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700520 if (fl) {
521 err = fl6_renew(fl, freq.flr_linger, freq.flr_expires);
522 fl_release(fl);
523 return err;
524 }
525 }
526 return -ESRCH;
527
528 case IPV6_FL_A_GET:
529 if (freq.flr_label & ~IPV6_FLOWLABEL_MASK)
530 return -EINVAL;
531
Maciej Żenczykowskiec0506d2011-08-28 12:35:31 +0000532 fl = fl_create(net, sk, &freq, optval, optlen, &err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700533 if (fl == NULL)
534 return err;
535 sfl1 = kmalloc(sizeof(*sfl1), GFP_KERNEL);
536
537 if (freq.flr_label) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700538 err = -EEXIST;
539 read_lock_bh(&ip6_sk_fl_lock);
540 for (sfl = np->ipv6_fl_list; sfl; sfl = sfl->next) {
541 if (sfl->fl->label == freq.flr_label) {
542 if (freq.flr_flags&IPV6_FL_F_EXCL) {
543 read_unlock_bh(&ip6_sk_fl_lock);
544 goto done;
545 }
546 fl1 = sfl->fl;
Yan Zheng4ea6a802005-10-24 19:55:23 +0800547 atomic_inc(&fl1->users);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700548 break;
549 }
550 }
551 read_unlock_bh(&ip6_sk_fl_lock);
552
553 if (fl1 == NULL)
Benjamin Thery60e8fbc2008-03-26 16:53:08 -0700554 fl1 = fl_lookup(net, freq.flr_label);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700555 if (fl1) {
Pavel Emelyanov78c2e502007-10-18 05:18:56 -0700556recheck:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557 err = -EEXIST;
558 if (freq.flr_flags&IPV6_FL_F_EXCL)
559 goto release;
560 err = -EPERM;
561 if (fl1->share == IPV6_FL_S_EXCL ||
562 fl1->share != fl->share ||
563 fl1->owner != fl->owner)
564 goto release;
565
566 err = -EINVAL;
567 if (!ipv6_addr_equal(&fl1->dst, &fl->dst) ||
568 ipv6_opt_cmp(fl1->opt, fl->opt))
569 goto release;
570
571 err = -ENOMEM;
572 if (sfl1 == NULL)
573 goto release;
574 if (fl->linger > fl1->linger)
575 fl1->linger = fl->linger;
576 if ((long)(fl->expires - fl1->expires) > 0)
577 fl1->expires = fl->expires;
Pavel Emelyanov04028042007-10-18 05:14:58 -0700578 fl_link(np, sfl1, fl1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700579 fl_free(fl);
580 return 0;
581
582release:
583 fl_release(fl1);
584 goto done;
585 }
586 }
587 err = -ENOENT;
588 if (!(freq.flr_flags&IPV6_FL_F_CREATE))
589 goto done;
590
591 err = -ENOMEM;
592 if (sfl1 == NULL || (err = mem_check(sk)) != 0)
593 goto done;
594
Benjamin Thery60e8fbc2008-03-26 16:53:08 -0700595 fl1 = fl_intern(net, fl, freq.flr_label);
Pavel Emelyanov78c2e502007-10-18 05:18:56 -0700596 if (fl1 != NULL)
597 goto recheck;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700598
David S. Miller6c94d362005-05-29 20:28:01 -0700599 if (!freq.flr_label) {
600 if (copy_to_user(&((struct in6_flowlabel_req __user *) optval)->flr_label,
601 &fl->label, sizeof(fl->label))) {
602 /* Intentionally ignore fault. */
603 }
604 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700605
Pavel Emelyanov04028042007-10-18 05:14:58 -0700606 fl_link(np, sfl1, fl);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700607 return 0;
608
609 default:
610 return -EINVAL;
611 }
612
613done:
614 fl_free(fl);
615 kfree(sfl1);
616 return err;
617}
618
619#ifdef CONFIG_PROC_FS
620
621struct ip6fl_iter_state {
Benjamin Thery5983a3d2008-03-26 16:53:30 -0700622 struct seq_net_private p;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700623 int bucket;
624};
625
626#define ip6fl_seq_private(seq) ((struct ip6fl_iter_state *)(seq)->private)
627
628static struct ip6_flowlabel *ip6fl_get_first(struct seq_file *seq)
629{
630 struct ip6_flowlabel *fl = NULL;
631 struct ip6fl_iter_state *state = ip6fl_seq_private(seq);
Benjamin Thery5983a3d2008-03-26 16:53:30 -0700632 struct net *net = seq_file_net(seq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700633
634 for (state->bucket = 0; state->bucket <= FL_HASH_MASK; ++state->bucket) {
Benjamin Thery5983a3d2008-03-26 16:53:30 -0700635 fl = fl_ht[state->bucket];
636
Octavian Purdila09ad9bc2009-11-25 15:14:13 -0800637 while (fl && !net_eq(fl->fl_net, net))
Benjamin Thery5983a3d2008-03-26 16:53:30 -0700638 fl = fl->next;
639 if (fl)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700640 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700641 }
642 return fl;
643}
644
645static struct ip6_flowlabel *ip6fl_get_next(struct seq_file *seq, struct ip6_flowlabel *fl)
646{
647 struct ip6fl_iter_state *state = ip6fl_seq_private(seq);
Benjamin Thery5983a3d2008-03-26 16:53:30 -0700648 struct net *net = seq_file_net(seq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700649
650 fl = fl->next;
Benjamin Thery5983a3d2008-03-26 16:53:30 -0700651try_again:
Octavian Purdila09ad9bc2009-11-25 15:14:13 -0800652 while (fl && !net_eq(fl->fl_net, net))
Benjamin Thery5983a3d2008-03-26 16:53:30 -0700653 fl = fl->next;
654
Linus Torvalds1da177e2005-04-16 15:20:36 -0700655 while (!fl) {
Benjamin Thery5983a3d2008-03-26 16:53:30 -0700656 if (++state->bucket <= FL_HASH_MASK) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700657 fl = fl_ht[state->bucket];
Benjamin Thery5983a3d2008-03-26 16:53:30 -0700658 goto try_again;
659 } else
James Morrisbcd62072006-10-30 15:08:42 -0800660 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700661 }
662 return fl;
663}
664
665static struct ip6_flowlabel *ip6fl_get_idx(struct seq_file *seq, loff_t pos)
666{
667 struct ip6_flowlabel *fl = ip6fl_get_first(seq);
668 if (fl)
669 while (pos && (fl = ip6fl_get_next(seq, fl)) != NULL)
670 --pos;
671 return pos ? NULL : fl;
672}
673
674static void *ip6fl_seq_start(struct seq_file *seq, loff_t *pos)
Eric Dumazet9a429c42008-01-01 21:58:02 -0800675 __acquires(ip6_fl_lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700676{
677 read_lock_bh(&ip6_fl_lock);
678 return *pos ? ip6fl_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
679}
680
681static void *ip6fl_seq_next(struct seq_file *seq, void *v, loff_t *pos)
682{
683 struct ip6_flowlabel *fl;
684
685 if (v == SEQ_START_TOKEN)
686 fl = ip6fl_get_first(seq);
687 else
688 fl = ip6fl_get_next(seq, v);
689 ++*pos;
690 return fl;
691}
692
693static void ip6fl_seq_stop(struct seq_file *seq, void *v)
Eric Dumazet9a429c42008-01-01 21:58:02 -0800694 __releases(ip6_fl_lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700695{
696 read_unlock_bh(&ip6_fl_lock);
697}
698
James Morris1b7c2db2006-10-31 00:43:44 -0800699static int ip6fl_seq_show(struct seq_file *seq, void *v)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700700{
James Morris1b7c2db2006-10-31 00:43:44 -0800701 if (v == SEQ_START_TOKEN)
702 seq_printf(seq, "%-5s %-1s %-6s %-6s %-6s %-8s %-32s %s\n",
703 "Label", "S", "Owner", "Users", "Linger", "Expires", "Dst", "Opt");
704 else {
705 struct ip6_flowlabel *fl = v;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700706 seq_printf(seq,
Harvey Harrison4b7a4272008-10-29 12:50:24 -0700707 "%05X %-1d %-6d %-6d %-6ld %-8ld %pi6 %-4d\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700708 (unsigned)ntohl(fl->label),
709 fl->share,
710 (unsigned)fl->owner,
711 atomic_read(&fl->users),
712 fl->linger/HZ,
713 (long)(fl->expires - jiffies)/HZ,
Harvey Harrisonb0711952008-10-28 16:05:40 -0700714 &fl->dst,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700715 fl->opt ? fl->opt->opt_nflen : 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700716 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700717 return 0;
718}
719
Philippe De Muyter56b3d972007-07-10 23:07:31 -0700720static const struct seq_operations ip6fl_seq_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700721 .start = ip6fl_seq_start,
722 .next = ip6fl_seq_next,
723 .stop = ip6fl_seq_stop,
724 .show = ip6fl_seq_show,
725};
726
727static int ip6fl_seq_open(struct inode *inode, struct file *file)
728{
Benjamin Thery5983a3d2008-03-26 16:53:30 -0700729 return seq_open_net(inode, file, &ip6fl_seq_ops,
730 sizeof(struct ip6fl_iter_state));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700731}
732
Arjan van de Ven9a321442007-02-12 00:55:35 -0800733static const struct file_operations ip6fl_seq_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700734 .owner = THIS_MODULE,
735 .open = ip6fl_seq_open,
736 .read = seq_read,
737 .llseek = seq_lseek,
Benjamin Thery5983a3d2008-03-26 16:53:30 -0700738 .release = seq_release_net,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700739};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700740
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +0000741static int __net_init ip6_flowlabel_proc_init(struct net *net)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700742{
Benjamin Thery5983a3d2008-03-26 16:53:30 -0700743 if (!proc_net_fops_create(net, "ip6_flowlabel",
744 S_IRUGO, &ip6fl_seq_fops))
Daniel Lezcano0a3e78a2007-12-11 02:23:18 -0800745 return -ENOMEM;
746 return 0;
747}
748
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +0000749static void __net_exit ip6_flowlabel_proc_fini(struct net *net)
Daniel Lezcano0a3e78a2007-12-11 02:23:18 -0800750{
751 proc_net_remove(net, "ip6_flowlabel");
752}
753#else
754static inline int ip6_flowlabel_proc_init(struct net *net)
755{
756 return 0;
757}
758static inline void ip6_flowlabel_proc_fini(struct net *net)
759{
Daniel Lezcano0a3e78a2007-12-11 02:23:18 -0800760}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700761#endif
Daniel Lezcano0a3e78a2007-12-11 02:23:18 -0800762
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +0000763static void __net_exit ip6_flowlabel_net_exit(struct net *net)
Benjamin Thery60e8fbc2008-03-26 16:53:08 -0700764{
765 ip6_fl_purge(net);
Benjamin Thery5983a3d2008-03-26 16:53:30 -0700766 ip6_flowlabel_proc_fini(net);
Benjamin Thery60e8fbc2008-03-26 16:53:08 -0700767}
768
769static struct pernet_operations ip6_flowlabel_net_ops = {
Benjamin Thery5983a3d2008-03-26 16:53:30 -0700770 .init = ip6_flowlabel_proc_init,
Benjamin Thery60e8fbc2008-03-26 16:53:08 -0700771 .exit = ip6_flowlabel_net_exit,
772};
773
Daniel Lezcano0a3e78a2007-12-11 02:23:18 -0800774int ip6_flowlabel_init(void)
775{
Benjamin Thery5983a3d2008-03-26 16:53:30 -0700776 return register_pernet_subsys(&ip6_flowlabel_net_ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700777}
778
779void ip6_flowlabel_cleanup(void)
780{
781 del_timer(&ip6_fl_gc_timer);
Benjamin Thery60e8fbc2008-03-26 16:53:08 -0700782 unregister_pernet_subsys(&ip6_flowlabel_net_ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700783}