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Commit | Line | Data |
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1da177e4 LT |
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 | ||
4fc268d2 | 12 | #include <linux/capability.h> |
1da177e4 LT |
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> | |
5a0e3ad6 | 23 | #include <linux/slab.h> |
bc3b2d7f | 24 | #include <linux/export.h> |
4f82f457 | 25 | #include <linux/pid_namespace.h> |
1da177e4 | 26 | |
457c4cbc | 27 | #include <net/net_namespace.h> |
1da177e4 LT |
28 | #include <net/sock.h> |
29 | ||
30 | #include <net/ipv6.h> | |
31 | #include <net/ndisc.h> | |
32 | #include <net/protocol.h> | |
33 | #include <net/ip6_route.h> | |
34 | #include <net/addrconf.h> | |
35 | #include <net/rawv6.h> | |
36 | #include <net/icmp.h> | |
37 | #include <net/transp_v6.h> | |
38 | ||
39 | #include <asm/uaccess.h> | |
40 | ||
41 | #define FL_MIN_LINGER 6 /* Minimal linger. It is set to 6sec specified | |
42 | in old IPv6 RFC. Well, it was reasonable value. | |
43 | */ | |
44 | #define FL_MAX_LINGER 60 /* Maximal linger timeout */ | |
45 | ||
46 | /* FL hash table */ | |
47 | ||
48 | #define FL_MAX_PER_SOCK 32 | |
49 | #define FL_MAX_SIZE 4096 | |
50 | #define FL_HASH_MASK 255 | |
51 | #define FL_HASH(l) (ntohl(l)&FL_HASH_MASK) | |
52 | ||
53 | static atomic_t fl_size = ATOMIC_INIT(0); | |
54 | static struct ip6_flowlabel *fl_ht[FL_HASH_MASK+1]; | |
55 | ||
56 | static void ip6_fl_gc(unsigned long dummy); | |
8d06afab | 57 | static DEFINE_TIMER(ip6_fl_gc_timer, ip6_fl_gc, 0, 0); |
1da177e4 LT |
58 | |
59 | /* FL hash table lock: it protects only of GC */ | |
60 | ||
61 | static DEFINE_RWLOCK(ip6_fl_lock); | |
62 | ||
63 | /* Big socket sock */ | |
64 | ||
65 | static DEFINE_RWLOCK(ip6_sk_fl_lock); | |
66 | ||
67 | ||
60e8fbc4 | 68 | static inline struct ip6_flowlabel *__fl_lookup(struct net *net, __be32 label) |
1da177e4 LT |
69 | { |
70 | struct ip6_flowlabel *fl; | |
71 | ||
72 | for (fl=fl_ht[FL_HASH(label)]; fl; fl = fl->next) { | |
09ad9bc7 | 73 | if (fl->label == label && net_eq(fl->fl_net, net)) |
1da177e4 LT |
74 | return fl; |
75 | } | |
76 | return NULL; | |
77 | } | |
78 | ||
60e8fbc4 | 79 | static struct ip6_flowlabel *fl_lookup(struct net *net, __be32 label) |
1da177e4 LT |
80 | { |
81 | struct ip6_flowlabel *fl; | |
82 | ||
83 | read_lock_bh(&ip6_fl_lock); | |
60e8fbc4 | 84 | fl = __fl_lookup(net, label); |
1da177e4 LT |
85 | if (fl) |
86 | atomic_inc(&fl->users); | |
87 | read_unlock_bh(&ip6_fl_lock); | |
88 | return fl; | |
89 | } | |
90 | ||
91 | ||
92 | static void fl_free(struct ip6_flowlabel *fl) | |
93 | { | |
4f82f457 EB |
94 | switch (fl->share) { |
95 | case IPV6_FL_S_PROCESS: | |
96 | put_pid(fl->owner.pid); | |
97 | break; | |
98 | } | |
60e8fbc4 BT |
99 | if (fl) { |
100 | release_net(fl->fl_net); | |
1da177e4 | 101 | kfree(fl->opt); |
60e8fbc4 | 102 | } |
1da177e4 LT |
103 | kfree(fl); |
104 | } | |
105 | ||
106 | static void fl_release(struct ip6_flowlabel *fl) | |
107 | { | |
108 | write_lock_bh(&ip6_fl_lock); | |
109 | ||
110 | fl->lastuse = jiffies; | |
111 | if (atomic_dec_and_test(&fl->users)) { | |
112 | unsigned long ttd = fl->lastuse + fl->linger; | |
113 | if (time_after(ttd, fl->expires)) | |
114 | fl->expires = ttd; | |
115 | ttd = fl->expires; | |
116 | if (fl->opt && fl->share == IPV6_FL_S_EXCL) { | |
117 | struct ipv6_txoptions *opt = fl->opt; | |
118 | fl->opt = NULL; | |
119 | kfree(opt); | |
120 | } | |
121 | if (!timer_pending(&ip6_fl_gc_timer) || | |
122 | time_after(ip6_fl_gc_timer.expires, ttd)) | |
123 | mod_timer(&ip6_fl_gc_timer, ttd); | |
124 | } | |
1da177e4 LT |
125 | write_unlock_bh(&ip6_fl_lock); |
126 | } | |
127 | ||
128 | static void ip6_fl_gc(unsigned long dummy) | |
129 | { | |
130 | int i; | |
131 | unsigned long now = jiffies; | |
132 | unsigned long sched = 0; | |
133 | ||
134 | write_lock(&ip6_fl_lock); | |
135 | ||
136 | for (i=0; i<=FL_HASH_MASK; i++) { | |
137 | struct ip6_flowlabel *fl, **flp; | |
138 | flp = &fl_ht[i]; | |
139 | while ((fl=*flp) != NULL) { | |
140 | if (atomic_read(&fl->users) == 0) { | |
141 | unsigned long ttd = fl->lastuse + fl->linger; | |
142 | if (time_after(ttd, fl->expires)) | |
143 | fl->expires = ttd; | |
144 | ttd = fl->expires; | |
145 | if (time_after_eq(now, ttd)) { | |
146 | *flp = fl->next; | |
147 | fl_free(fl); | |
148 | atomic_dec(&fl_size); | |
149 | continue; | |
150 | } | |
151 | if (!sched || time_before(ttd, sched)) | |
152 | sched = ttd; | |
153 | } | |
154 | flp = &fl->next; | |
155 | } | |
156 | } | |
157 | if (!sched && atomic_read(&fl_size)) | |
158 | sched = now + FL_MAX_LINGER; | |
159 | if (sched) { | |
60e8fbc4 | 160 | mod_timer(&ip6_fl_gc_timer, sched); |
1da177e4 LT |
161 | } |
162 | write_unlock(&ip6_fl_lock); | |
163 | } | |
164 | ||
2c8c1e72 | 165 | static void __net_exit ip6_fl_purge(struct net *net) |
60e8fbc4 BT |
166 | { |
167 | int i; | |
168 | ||
169 | write_lock(&ip6_fl_lock); | |
170 | for (i = 0; i <= FL_HASH_MASK; i++) { | |
171 | struct ip6_flowlabel *fl, **flp; | |
172 | flp = &fl_ht[i]; | |
173 | while ((fl = *flp) != NULL) { | |
09ad9bc7 OP |
174 | if (net_eq(fl->fl_net, net) && |
175 | atomic_read(&fl->users) == 0) { | |
60e8fbc4 BT |
176 | *flp = fl->next; |
177 | fl_free(fl); | |
178 | atomic_dec(&fl_size); | |
179 | continue; | |
180 | } | |
181 | flp = &fl->next; | |
182 | } | |
183 | } | |
184 | write_unlock(&ip6_fl_lock); | |
185 | } | |
186 | ||
187 | static struct ip6_flowlabel *fl_intern(struct net *net, | |
188 | struct ip6_flowlabel *fl, __be32 label) | |
1da177e4 | 189 | { |
78c2e502 PE |
190 | struct ip6_flowlabel *lfl; |
191 | ||
1da177e4 LT |
192 | fl->label = label & IPV6_FLOWLABEL_MASK; |
193 | ||
194 | write_lock_bh(&ip6_fl_lock); | |
195 | if (label == 0) { | |
196 | for (;;) { | |
197 | fl->label = htonl(net_random())&IPV6_FLOWLABEL_MASK; | |
198 | if (fl->label) { | |
60e8fbc4 | 199 | lfl = __fl_lookup(net, fl->label); |
1da177e4 LT |
200 | if (lfl == NULL) |
201 | break; | |
202 | } | |
203 | } | |
78c2e502 PE |
204 | } else { |
205 | /* | |
206 | * we dropper the ip6_fl_lock, so this entry could reappear | |
207 | * and we need to recheck with it. | |
208 | * | |
209 | * OTOH no need to search the active socket first, like it is | |
210 | * done in ipv6_flowlabel_opt - sock is locked, so new entry | |
211 | * with the same label can only appear on another sock | |
212 | */ | |
60e8fbc4 | 213 | lfl = __fl_lookup(net, fl->label); |
78c2e502 PE |
214 | if (lfl != NULL) { |
215 | atomic_inc(&lfl->users); | |
216 | write_unlock_bh(&ip6_fl_lock); | |
217 | return lfl; | |
218 | } | |
1da177e4 LT |
219 | } |
220 | ||
221 | fl->lastuse = jiffies; | |
222 | fl->next = fl_ht[FL_HASH(fl->label)]; | |
223 | fl_ht[FL_HASH(fl->label)] = fl; | |
224 | atomic_inc(&fl_size); | |
225 | write_unlock_bh(&ip6_fl_lock); | |
78c2e502 | 226 | return NULL; |
1da177e4 LT |
227 | } |
228 | ||
229 | ||
230 | ||
231 | /* Socket flowlabel lists */ | |
232 | ||
90bcaf7b | 233 | struct ip6_flowlabel * fl6_sock_lookup(struct sock *sk, __be32 label) |
1da177e4 LT |
234 | { |
235 | struct ipv6_fl_socklist *sfl; | |
236 | struct ipv6_pinfo *np = inet6_sk(sk); | |
237 | ||
238 | label &= IPV6_FLOWLABEL_MASK; | |
239 | ||
bd0bf577 | 240 | read_lock_bh(&ip6_sk_fl_lock); |
1da177e4 LT |
241 | for (sfl=np->ipv6_fl_list; sfl; sfl = sfl->next) { |
242 | struct ip6_flowlabel *fl = sfl->fl; | |
243 | if (fl->label == label) { | |
244 | fl->lastuse = jiffies; | |
245 | atomic_inc(&fl->users); | |
52f095ee | 246 | read_unlock_bh(&ip6_sk_fl_lock); |
1da177e4 LT |
247 | return fl; |
248 | } | |
249 | } | |
bd0bf577 | 250 | read_unlock_bh(&ip6_sk_fl_lock); |
1da177e4 LT |
251 | return NULL; |
252 | } | |
253 | ||
3cf3dc6c ACM |
254 | EXPORT_SYMBOL_GPL(fl6_sock_lookup); |
255 | ||
1da177e4 LT |
256 | void fl6_free_socklist(struct sock *sk) |
257 | { | |
258 | struct ipv6_pinfo *np = inet6_sk(sk); | |
259 | struct ipv6_fl_socklist *sfl; | |
260 | ||
261 | while ((sfl = np->ipv6_fl_list) != NULL) { | |
262 | np->ipv6_fl_list = sfl->next; | |
263 | fl_release(sfl->fl); | |
264 | kfree(sfl); | |
265 | } | |
266 | } | |
267 | ||
268 | /* Service routines */ | |
269 | ||
270 | ||
271 | /* | |
272 | It is the only difficult place. flowlabel enforces equal headers | |
273 | before and including routing header, however user may supply options | |
274 | following rthdr. | |
275 | */ | |
276 | ||
277 | struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions * opt_space, | |
278 | struct ip6_flowlabel * fl, | |
279 | struct ipv6_txoptions * fopt) | |
280 | { | |
df9890c3 | 281 | struct ipv6_txoptions * fl_opt = fl->opt; |
1ab1457c | 282 | |
df9890c3 YH |
283 | if (fopt == NULL || fopt->opt_flen == 0) |
284 | return fl_opt; | |
1ab1457c | 285 | |
1da177e4 LT |
286 | if (fl_opt != NULL) { |
287 | opt_space->hopopt = fl_opt->hopopt; | |
df9890c3 | 288 | opt_space->dst0opt = fl_opt->dst0opt; |
1da177e4 LT |
289 | opt_space->srcrt = fl_opt->srcrt; |
290 | opt_space->opt_nflen = fl_opt->opt_nflen; | |
291 | } else { | |
292 | if (fopt->opt_nflen == 0) | |
293 | return fopt; | |
294 | opt_space->hopopt = NULL; | |
295 | opt_space->dst0opt = NULL; | |
296 | opt_space->srcrt = NULL; | |
297 | opt_space->opt_nflen = 0; | |
298 | } | |
299 | opt_space->dst1opt = fopt->dst1opt; | |
1da177e4 LT |
300 | opt_space->opt_flen = fopt->opt_flen; |
301 | return opt_space; | |
302 | } | |
a495f836 | 303 | EXPORT_SYMBOL_GPL(fl6_merge_options); |
1da177e4 LT |
304 | |
305 | static unsigned long check_linger(unsigned long ttl) | |
306 | { | |
307 | if (ttl < FL_MIN_LINGER) | |
308 | return FL_MIN_LINGER*HZ; | |
309 | if (ttl > FL_MAX_LINGER && !capable(CAP_NET_ADMIN)) | |
310 | return 0; | |
311 | return ttl*HZ; | |
312 | } | |
313 | ||
314 | static int fl6_renew(struct ip6_flowlabel *fl, unsigned long linger, unsigned long expires) | |
315 | { | |
316 | linger = check_linger(linger); | |
317 | if (!linger) | |
318 | return -EPERM; | |
319 | expires = check_linger(expires); | |
320 | if (!expires) | |
321 | return -EPERM; | |
322 | fl->lastuse = jiffies; | |
323 | if (time_before(fl->linger, linger)) | |
324 | fl->linger = linger; | |
325 | if (time_before(expires, fl->linger)) | |
326 | expires = fl->linger; | |
327 | if (time_before(fl->expires, fl->lastuse + expires)) | |
328 | fl->expires = fl->lastuse + expires; | |
329 | return 0; | |
330 | } | |
331 | ||
332 | static struct ip6_flowlabel * | |
ec0506db MÅ» |
333 | fl_create(struct net *net, struct sock *sk, struct in6_flowlabel_req *freq, |
334 | char __user *optval, int optlen, int *err_p) | |
1da177e4 | 335 | { |
684de409 | 336 | struct ip6_flowlabel *fl = NULL; |
1da177e4 LT |
337 | int olen; |
338 | int addr_type; | |
339 | int err; | |
340 | ||
684de409 DM |
341 | olen = optlen - CMSG_ALIGN(sizeof(*freq)); |
342 | err = -EINVAL; | |
343 | if (olen > 64 * 1024) | |
344 | goto done; | |
345 | ||
1da177e4 | 346 | err = -ENOMEM; |
0c600eda | 347 | fl = kzalloc(sizeof(*fl), GFP_KERNEL); |
1da177e4 LT |
348 | if (fl == NULL) |
349 | goto done; | |
1da177e4 | 350 | |
1da177e4 LT |
351 | if (olen > 0) { |
352 | struct msghdr msg; | |
4c9483b2 | 353 | struct flowi6 flowi6; |
1da177e4 LT |
354 | int junk; |
355 | ||
356 | err = -ENOMEM; | |
357 | fl->opt = kmalloc(sizeof(*fl->opt) + olen, GFP_KERNEL); | |
358 | if (fl->opt == NULL) | |
359 | goto done; | |
360 | ||
361 | memset(fl->opt, 0, sizeof(*fl->opt)); | |
362 | fl->opt->tot_len = sizeof(*fl->opt) + olen; | |
363 | err = -EFAULT; | |
364 | if (copy_from_user(fl->opt+1, optval+CMSG_ALIGN(sizeof(*freq)), olen)) | |
365 | goto done; | |
366 | ||
367 | msg.msg_controllen = olen; | |
368 | msg.msg_control = (void*)(fl->opt+1); | |
4c9483b2 | 369 | memset(&flowi6, 0, sizeof(flowi6)); |
1da177e4 | 370 | |
ec0506db | 371 | err = datagram_send_ctl(net, sk, &msg, &flowi6, fl->opt, &junk, |
13b52cd4 | 372 | &junk, &junk); |
1da177e4 LT |
373 | if (err) |
374 | goto done; | |
375 | err = -EINVAL; | |
376 | if (fl->opt->opt_flen) | |
377 | goto done; | |
378 | if (fl->opt->opt_nflen == 0) { | |
379 | kfree(fl->opt); | |
380 | fl->opt = NULL; | |
381 | } | |
382 | } | |
383 | ||
60e8fbc4 | 384 | fl->fl_net = hold_net(net); |
1da177e4 LT |
385 | fl->expires = jiffies; |
386 | err = fl6_renew(fl, freq->flr_linger, freq->flr_expires); | |
387 | if (err) | |
388 | goto done; | |
389 | fl->share = freq->flr_share; | |
390 | addr_type = ipv6_addr_type(&freq->flr_dst); | |
35700212 JP |
391 | if ((addr_type & IPV6_ADDR_MAPPED) || |
392 | addr_type == IPV6_ADDR_ANY) { | |
c6817e4c | 393 | err = -EINVAL; |
1da177e4 | 394 | goto done; |
c6817e4c | 395 | } |
4e3fd7a0 | 396 | fl->dst = freq->flr_dst; |
1da177e4 LT |
397 | atomic_set(&fl->users, 1); |
398 | switch (fl->share) { | |
399 | case IPV6_FL_S_EXCL: | |
400 | case IPV6_FL_S_ANY: | |
401 | break; | |
402 | case IPV6_FL_S_PROCESS: | |
4f82f457 | 403 | fl->owner.pid = get_task_pid(current, PIDTYPE_PID); |
1da177e4 LT |
404 | break; |
405 | case IPV6_FL_S_USER: | |
4f82f457 | 406 | fl->owner.uid = current_euid(); |
1da177e4 LT |
407 | break; |
408 | default: | |
409 | err = -EINVAL; | |
410 | goto done; | |
411 | } | |
412 | return fl; | |
413 | ||
414 | done: | |
415 | fl_free(fl); | |
416 | *err_p = err; | |
417 | return NULL; | |
418 | } | |
419 | ||
420 | static int mem_check(struct sock *sk) | |
421 | { | |
422 | struct ipv6_pinfo *np = inet6_sk(sk); | |
423 | struct ipv6_fl_socklist *sfl; | |
424 | int room = FL_MAX_SIZE - atomic_read(&fl_size); | |
425 | int count = 0; | |
426 | ||
427 | if (room > FL_MAX_SIZE - FL_MAX_PER_SOCK) | |
428 | return 0; | |
429 | ||
430 | for (sfl = np->ipv6_fl_list; sfl; sfl = sfl->next) | |
431 | count++; | |
432 | ||
433 | if (room <= 0 || | |
434 | ((count >= FL_MAX_PER_SOCK || | |
35700212 JP |
435 | (count > 0 && room < FL_MAX_SIZE/2) || room < FL_MAX_SIZE/4) && |
436 | !capable(CAP_NET_ADMIN))) | |
1da177e4 LT |
437 | return -ENOBUFS; |
438 | ||
439 | return 0; | |
440 | } | |
441 | ||
a50feda5 | 442 | static bool ipv6_hdr_cmp(struct ipv6_opt_hdr *h1, struct ipv6_opt_hdr *h2) |
1da177e4 LT |
443 | { |
444 | if (h1 == h2) | |
a50feda5 | 445 | return false; |
1da177e4 | 446 | if (h1 == NULL || h2 == NULL) |
a50feda5 | 447 | return true; |
1da177e4 | 448 | if (h1->hdrlen != h2->hdrlen) |
a50feda5 | 449 | return true; |
1da177e4 LT |
450 | return memcmp(h1+1, h2+1, ((h1->hdrlen+1)<<3) - sizeof(*h1)); |
451 | } | |
452 | ||
a50feda5 | 453 | static bool ipv6_opt_cmp(struct ipv6_txoptions *o1, struct ipv6_txoptions *o2) |
1da177e4 LT |
454 | { |
455 | if (o1 == o2) | |
a50feda5 | 456 | return false; |
1da177e4 | 457 | if (o1 == NULL || o2 == NULL) |
a50feda5 | 458 | return true; |
1da177e4 | 459 | if (o1->opt_nflen != o2->opt_nflen) |
a50feda5 | 460 | return true; |
1da177e4 | 461 | if (ipv6_hdr_cmp(o1->hopopt, o2->hopopt)) |
a50feda5 | 462 | return true; |
1da177e4 | 463 | if (ipv6_hdr_cmp(o1->dst0opt, o2->dst0opt)) |
a50feda5 | 464 | return true; |
1da177e4 | 465 | if (ipv6_hdr_cmp((struct ipv6_opt_hdr *)o1->srcrt, (struct ipv6_opt_hdr *)o2->srcrt)) |
a50feda5 ED |
466 | return true; |
467 | return false; | |
1da177e4 LT |
468 | } |
469 | ||
04028045 PE |
470 | static inline void fl_link(struct ipv6_pinfo *np, struct ipv6_fl_socklist *sfl, |
471 | struct ip6_flowlabel *fl) | |
472 | { | |
473 | write_lock_bh(&ip6_sk_fl_lock); | |
474 | sfl->fl = fl; | |
475 | sfl->next = np->ipv6_fl_list; | |
476 | np->ipv6_fl_list = sfl; | |
477 | write_unlock_bh(&ip6_sk_fl_lock); | |
478 | } | |
479 | ||
1da177e4 LT |
480 | int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen) |
481 | { | |
55205d40 | 482 | int uninitialized_var(err); |
60e8fbc4 | 483 | struct net *net = sock_net(sk); |
1da177e4 LT |
484 | struct ipv6_pinfo *np = inet6_sk(sk); |
485 | struct in6_flowlabel_req freq; | |
486 | struct ipv6_fl_socklist *sfl1=NULL; | |
487 | struct ipv6_fl_socklist *sfl, **sflp; | |
78c2e502 PE |
488 | struct ip6_flowlabel *fl, *fl1 = NULL; |
489 | ||
1da177e4 LT |
490 | |
491 | if (optlen < sizeof(freq)) | |
492 | return -EINVAL; | |
493 | ||
494 | if (copy_from_user(&freq, optval, sizeof(freq))) | |
495 | return -EFAULT; | |
496 | ||
497 | switch (freq.flr_action) { | |
498 | case IPV6_FL_A_PUT: | |
499 | write_lock_bh(&ip6_sk_fl_lock); | |
500 | for (sflp = &np->ipv6_fl_list; (sfl=*sflp)!=NULL; sflp = &sfl->next) { | |
501 | if (sfl->fl->label == freq.flr_label) { | |
502 | if (freq.flr_label == (np->flow_label&IPV6_FLOWLABEL_MASK)) | |
503 | np->flow_label &= ~IPV6_FLOWLABEL_MASK; | |
504 | *sflp = sfl->next; | |
505 | write_unlock_bh(&ip6_sk_fl_lock); | |
506 | fl_release(sfl->fl); | |
507 | kfree(sfl); | |
508 | return 0; | |
509 | } | |
510 | } | |
511 | write_unlock_bh(&ip6_sk_fl_lock); | |
512 | return -ESRCH; | |
513 | ||
514 | case IPV6_FL_A_RENEW: | |
515 | read_lock_bh(&ip6_sk_fl_lock); | |
516 | for (sfl = np->ipv6_fl_list; sfl; sfl = sfl->next) { | |
517 | if (sfl->fl->label == freq.flr_label) { | |
518 | err = fl6_renew(sfl->fl, freq.flr_linger, freq.flr_expires); | |
519 | read_unlock_bh(&ip6_sk_fl_lock); | |
520 | return err; | |
521 | } | |
522 | } | |
523 | read_unlock_bh(&ip6_sk_fl_lock); | |
524 | ||
525 | if (freq.flr_share == IPV6_FL_S_NONE && capable(CAP_NET_ADMIN)) { | |
60e8fbc4 | 526 | fl = fl_lookup(net, freq.flr_label); |
1da177e4 LT |
527 | if (fl) { |
528 | err = fl6_renew(fl, freq.flr_linger, freq.flr_expires); | |
529 | fl_release(fl); | |
530 | return err; | |
531 | } | |
532 | } | |
533 | return -ESRCH; | |
534 | ||
535 | case IPV6_FL_A_GET: | |
536 | if (freq.flr_label & ~IPV6_FLOWLABEL_MASK) | |
537 | return -EINVAL; | |
538 | ||
ec0506db | 539 | fl = fl_create(net, sk, &freq, optval, optlen, &err); |
1da177e4 LT |
540 | if (fl == NULL) |
541 | return err; | |
542 | sfl1 = kmalloc(sizeof(*sfl1), GFP_KERNEL); | |
543 | ||
544 | if (freq.flr_label) { | |
1da177e4 LT |
545 | err = -EEXIST; |
546 | read_lock_bh(&ip6_sk_fl_lock); | |
547 | for (sfl = np->ipv6_fl_list; sfl; sfl = sfl->next) { | |
548 | if (sfl->fl->label == freq.flr_label) { | |
549 | if (freq.flr_flags&IPV6_FL_F_EXCL) { | |
550 | read_unlock_bh(&ip6_sk_fl_lock); | |
551 | goto done; | |
552 | } | |
553 | fl1 = sfl->fl; | |
4ea6a804 | 554 | atomic_inc(&fl1->users); |
1da177e4 LT |
555 | break; |
556 | } | |
557 | } | |
558 | read_unlock_bh(&ip6_sk_fl_lock); | |
559 | ||
560 | if (fl1 == NULL) | |
60e8fbc4 | 561 | fl1 = fl_lookup(net, freq.flr_label); |
1da177e4 | 562 | if (fl1) { |
78c2e502 | 563 | recheck: |
1da177e4 LT |
564 | err = -EEXIST; |
565 | if (freq.flr_flags&IPV6_FL_F_EXCL) | |
566 | goto release; | |
567 | err = -EPERM; | |
568 | if (fl1->share == IPV6_FL_S_EXCL || | |
569 | fl1->share != fl->share || | |
4f82f457 EB |
570 | ((fl1->share == IPV6_FL_S_PROCESS) && |
571 | (fl1->owner.pid == fl->owner.pid)) || | |
572 | ((fl1->share == IPV6_FL_S_USER) && | |
573 | uid_eq(fl1->owner.uid, fl->owner.uid))) | |
1da177e4 LT |
574 | goto release; |
575 | ||
576 | err = -EINVAL; | |
577 | if (!ipv6_addr_equal(&fl1->dst, &fl->dst) || | |
578 | ipv6_opt_cmp(fl1->opt, fl->opt)) | |
579 | goto release; | |
580 | ||
581 | err = -ENOMEM; | |
582 | if (sfl1 == NULL) | |
583 | goto release; | |
584 | if (fl->linger > fl1->linger) | |
585 | fl1->linger = fl->linger; | |
586 | if ((long)(fl->expires - fl1->expires) > 0) | |
587 | fl1->expires = fl->expires; | |
04028045 | 588 | fl_link(np, sfl1, fl1); |
1da177e4 LT |
589 | fl_free(fl); |
590 | return 0; | |
591 | ||
592 | release: | |
593 | fl_release(fl1); | |
594 | goto done; | |
595 | } | |
596 | } | |
597 | err = -ENOENT; | |
598 | if (!(freq.flr_flags&IPV6_FL_F_CREATE)) | |
599 | goto done; | |
600 | ||
601 | err = -ENOMEM; | |
602 | if (sfl1 == NULL || (err = mem_check(sk)) != 0) | |
603 | goto done; | |
604 | ||
60e8fbc4 | 605 | fl1 = fl_intern(net, fl, freq.flr_label); |
78c2e502 PE |
606 | if (fl1 != NULL) |
607 | goto recheck; | |
1da177e4 | 608 | |
6c94d361 DM |
609 | if (!freq.flr_label) { |
610 | if (copy_to_user(&((struct in6_flowlabel_req __user *) optval)->flr_label, | |
611 | &fl->label, sizeof(fl->label))) { | |
612 | /* Intentionally ignore fault. */ | |
613 | } | |
614 | } | |
1da177e4 | 615 | |
04028045 | 616 | fl_link(np, sfl1, fl); |
1da177e4 LT |
617 | return 0; |
618 | ||
619 | default: | |
620 | return -EINVAL; | |
621 | } | |
622 | ||
623 | done: | |
624 | fl_free(fl); | |
625 | kfree(sfl1); | |
626 | return err; | |
627 | } | |
628 | ||
629 | #ifdef CONFIG_PROC_FS | |
630 | ||
631 | struct ip6fl_iter_state { | |
5983a3df | 632 | struct seq_net_private p; |
4f82f457 | 633 | struct pid_namespace *pid_ns; |
1da177e4 LT |
634 | int bucket; |
635 | }; | |
636 | ||
637 | #define ip6fl_seq_private(seq) ((struct ip6fl_iter_state *)(seq)->private) | |
638 | ||
639 | static struct ip6_flowlabel *ip6fl_get_first(struct seq_file *seq) | |
640 | { | |
641 | struct ip6_flowlabel *fl = NULL; | |
642 | struct ip6fl_iter_state *state = ip6fl_seq_private(seq); | |
5983a3df | 643 | struct net *net = seq_file_net(seq); |
1da177e4 LT |
644 | |
645 | for (state->bucket = 0; state->bucket <= FL_HASH_MASK; ++state->bucket) { | |
5983a3df BT |
646 | fl = fl_ht[state->bucket]; |
647 | ||
09ad9bc7 | 648 | while (fl && !net_eq(fl->fl_net, net)) |
5983a3df BT |
649 | fl = fl->next; |
650 | if (fl) | |
1da177e4 | 651 | break; |
1da177e4 LT |
652 | } |
653 | return fl; | |
654 | } | |
655 | ||
656 | static struct ip6_flowlabel *ip6fl_get_next(struct seq_file *seq, struct ip6_flowlabel *fl) | |
657 | { | |
658 | struct ip6fl_iter_state *state = ip6fl_seq_private(seq); | |
5983a3df | 659 | struct net *net = seq_file_net(seq); |
1da177e4 LT |
660 | |
661 | fl = fl->next; | |
5983a3df | 662 | try_again: |
09ad9bc7 | 663 | while (fl && !net_eq(fl->fl_net, net)) |
5983a3df BT |
664 | fl = fl->next; |
665 | ||
1da177e4 | 666 | while (!fl) { |
5983a3df | 667 | if (++state->bucket <= FL_HASH_MASK) { |
1da177e4 | 668 | fl = fl_ht[state->bucket]; |
5983a3df BT |
669 | goto try_again; |
670 | } else | |
bcd62075 | 671 | break; |
1da177e4 LT |
672 | } |
673 | return fl; | |
674 | } | |
675 | ||
676 | static struct ip6_flowlabel *ip6fl_get_idx(struct seq_file *seq, loff_t pos) | |
677 | { | |
678 | struct ip6_flowlabel *fl = ip6fl_get_first(seq); | |
679 | if (fl) | |
680 | while (pos && (fl = ip6fl_get_next(seq, fl)) != NULL) | |
681 | --pos; | |
682 | return pos ? NULL : fl; | |
683 | } | |
684 | ||
685 | static void *ip6fl_seq_start(struct seq_file *seq, loff_t *pos) | |
9a429c49 | 686 | __acquires(ip6_fl_lock) |
1da177e4 LT |
687 | { |
688 | read_lock_bh(&ip6_fl_lock); | |
689 | return *pos ? ip6fl_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; | |
690 | } | |
691 | ||
692 | static void *ip6fl_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
693 | { | |
694 | struct ip6_flowlabel *fl; | |
695 | ||
696 | if (v == SEQ_START_TOKEN) | |
697 | fl = ip6fl_get_first(seq); | |
698 | else | |
699 | fl = ip6fl_get_next(seq, v); | |
700 | ++*pos; | |
701 | return fl; | |
702 | } | |
703 | ||
704 | static void ip6fl_seq_stop(struct seq_file *seq, void *v) | |
9a429c49 | 705 | __releases(ip6_fl_lock) |
1da177e4 LT |
706 | { |
707 | read_unlock_bh(&ip6_fl_lock); | |
708 | } | |
709 | ||
1b7c2dbc | 710 | static int ip6fl_seq_show(struct seq_file *seq, void *v) |
1da177e4 | 711 | { |
4f82f457 | 712 | struct ip6fl_iter_state *state = ip6fl_seq_private(seq); |
1b7c2dbc JM |
713 | if (v == SEQ_START_TOKEN) |
714 | seq_printf(seq, "%-5s %-1s %-6s %-6s %-6s %-8s %-32s %s\n", | |
715 | "Label", "S", "Owner", "Users", "Linger", "Expires", "Dst", "Opt"); | |
716 | else { | |
717 | struct ip6_flowlabel *fl = v; | |
1da177e4 | 718 | seq_printf(seq, |
4b7a4274 | 719 | "%05X %-1d %-6d %-6d %-6ld %-8ld %pi6 %-4d\n", |
95c96174 | 720 | (unsigned int)ntohl(fl->label), |
1da177e4 | 721 | fl->share, |
4f82f457 EB |
722 | ((fl->share == IPV6_FL_S_PROCESS) ? |
723 | pid_nr_ns(fl->owner.pid, state->pid_ns) : | |
724 | ((fl->share == IPV6_FL_S_USER) ? | |
725 | from_kuid_munged(seq_user_ns(seq), fl->owner.uid) : | |
726 | 0)), | |
1da177e4 LT |
727 | atomic_read(&fl->users), |
728 | fl->linger/HZ, | |
729 | (long)(fl->expires - jiffies)/HZ, | |
b071195d | 730 | &fl->dst, |
1da177e4 | 731 | fl->opt ? fl->opt->opt_nflen : 0); |
1da177e4 | 732 | } |
1da177e4 LT |
733 | return 0; |
734 | } | |
735 | ||
56b3d975 | 736 | static const struct seq_operations ip6fl_seq_ops = { |
1da177e4 LT |
737 | .start = ip6fl_seq_start, |
738 | .next = ip6fl_seq_next, | |
739 | .stop = ip6fl_seq_stop, | |
740 | .show = ip6fl_seq_show, | |
741 | }; | |
742 | ||
743 | static int ip6fl_seq_open(struct inode *inode, struct file *file) | |
744 | { | |
4f82f457 EB |
745 | struct seq_file *seq; |
746 | struct ip6fl_iter_state *state; | |
747 | int err; | |
748 | ||
749 | err = seq_open_net(inode, file, &ip6fl_seq_ops, | |
750 | sizeof(struct ip6fl_iter_state)); | |
751 | ||
752 | if (!err) { | |
753 | seq = file->private_data; | |
754 | state = ip6fl_seq_private(seq); | |
755 | rcu_read_lock(); | |
756 | state->pid_ns = get_pid_ns(task_active_pid_ns(current)); | |
757 | rcu_read_unlock(); | |
758 | } | |
759 | return err; | |
760 | } | |
761 | ||
762 | static int ip6fl_seq_release(struct inode *inode, struct file *file) | |
763 | { | |
764 | struct seq_file *seq = file->private_data; | |
765 | struct ip6fl_iter_state *state = ip6fl_seq_private(seq); | |
766 | put_pid_ns(state->pid_ns); | |
767 | return seq_release_net(inode, file); | |
1da177e4 LT |
768 | } |
769 | ||
9a32144e | 770 | static const struct file_operations ip6fl_seq_fops = { |
1da177e4 LT |
771 | .owner = THIS_MODULE, |
772 | .open = ip6fl_seq_open, | |
773 | .read = seq_read, | |
774 | .llseek = seq_lseek, | |
4f82f457 | 775 | .release = ip6fl_seq_release, |
1da177e4 | 776 | }; |
1da177e4 | 777 | |
2c8c1e72 | 778 | static int __net_init ip6_flowlabel_proc_init(struct net *net) |
0a3e78ac | 779 | { |
5983a3df BT |
780 | if (!proc_net_fops_create(net, "ip6_flowlabel", |
781 | S_IRUGO, &ip6fl_seq_fops)) | |
0a3e78ac DL |
782 | return -ENOMEM; |
783 | return 0; | |
784 | } | |
1da177e4 | 785 | |
2c8c1e72 | 786 | static void __net_exit ip6_flowlabel_proc_fini(struct net *net) |
1da177e4 | 787 | { |
0a3e78ac DL |
788 | proc_net_remove(net, "ip6_flowlabel"); |
789 | } | |
790 | #else | |
791 | static inline int ip6_flowlabel_proc_init(struct net *net) | |
792 | { | |
793 | return 0; | |
794 | } | |
795 | static inline void ip6_flowlabel_proc_fini(struct net *net) | |
796 | { | |
0a3e78ac | 797 | } |
1da177e4 | 798 | #endif |
0a3e78ac | 799 | |
2c8c1e72 | 800 | static void __net_exit ip6_flowlabel_net_exit(struct net *net) |
60e8fbc4 BT |
801 | { |
802 | ip6_fl_purge(net); | |
5983a3df | 803 | ip6_flowlabel_proc_fini(net); |
60e8fbc4 BT |
804 | } |
805 | ||
806 | static struct pernet_operations ip6_flowlabel_net_ops = { | |
5983a3df | 807 | .init = ip6_flowlabel_proc_init, |
60e8fbc4 BT |
808 | .exit = ip6_flowlabel_net_exit, |
809 | }; | |
810 | ||
0a3e78ac DL |
811 | int ip6_flowlabel_init(void) |
812 | { | |
5983a3df | 813 | return register_pernet_subsys(&ip6_flowlabel_net_ops); |
1da177e4 LT |
814 | } |
815 | ||
816 | void ip6_flowlabel_cleanup(void) | |
817 | { | |
818 | del_timer(&ip6_fl_gc_timer); | |
60e8fbc4 | 819 | unregister_pernet_subsys(&ip6_flowlabel_net_ops); |
1da177e4 | 820 | } |