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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 | */ | |
53b47106 | 44 | #define FL_MAX_LINGER 150 /* Maximal linger timeout */ |
1da177e4 LT |
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); | |
d3aedd5e | 54 | static struct ip6_flowlabel __rcu *fl_ht[FL_HASH_MASK+1]; |
1da177e4 LT |
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 | ||
d3aedd5e | 61 | static DEFINE_SPINLOCK(ip6_fl_lock); |
1da177e4 LT |
62 | |
63 | /* Big socket sock */ | |
64 | ||
18367681 | 65 | static DEFINE_SPINLOCK(ip6_sk_fl_lock); |
1da177e4 | 66 | |
d3aedd5e | 67 | #define for_each_fl_rcu(hash, fl) \ |
6a98dcf0 | 68 | for (fl = rcu_dereference_bh(fl_ht[(hash)]); \ |
d3aedd5e | 69 | fl != NULL; \ |
6a98dcf0 | 70 | fl = rcu_dereference_bh(fl->next)) |
d3aedd5e | 71 | #define for_each_fl_continue_rcu(fl) \ |
6a98dcf0 | 72 | for (fl = rcu_dereference_bh(fl->next); \ |
d3aedd5e | 73 | fl != NULL; \ |
6a98dcf0 | 74 | fl = rcu_dereference_bh(fl->next)) |
1da177e4 | 75 | |
18367681 YH |
76 | #define for_each_sk_fl_rcu(np, sfl) \ |
77 | for (sfl = rcu_dereference_bh(np->ipv6_fl_list); \ | |
78 | sfl != NULL; \ | |
79 | sfl = rcu_dereference_bh(sfl->next)) | |
80 | ||
60e8fbc4 | 81 | static inline struct ip6_flowlabel *__fl_lookup(struct net *net, __be32 label) |
1da177e4 LT |
82 | { |
83 | struct ip6_flowlabel *fl; | |
84 | ||
d3aedd5e | 85 | for_each_fl_rcu(FL_HASH(label), fl) { |
09ad9bc7 | 86 | if (fl->label == label && net_eq(fl->fl_net, net)) |
1da177e4 LT |
87 | return fl; |
88 | } | |
89 | return NULL; | |
90 | } | |
91 | ||
60e8fbc4 | 92 | static struct ip6_flowlabel *fl_lookup(struct net *net, __be32 label) |
1da177e4 LT |
93 | { |
94 | struct ip6_flowlabel *fl; | |
95 | ||
d3aedd5e | 96 | rcu_read_lock_bh(); |
60e8fbc4 | 97 | fl = __fl_lookup(net, label); |
d3aedd5e YH |
98 | if (fl && !atomic_inc_not_zero(&fl->users)) |
99 | fl = NULL; | |
100 | rcu_read_unlock_bh(); | |
1da177e4 LT |
101 | return fl; |
102 | } | |
103 | ||
104 | ||
105 | static void fl_free(struct ip6_flowlabel *fl) | |
106 | { | |
60e8fbc4 | 107 | if (fl) { |
898132ae DC |
108 | if (fl->share == IPV6_FL_S_PROCESS) |
109 | put_pid(fl->owner.pid); | |
60e8fbc4 | 110 | release_net(fl->fl_net); |
1da177e4 | 111 | kfree(fl->opt); |
d3aedd5e | 112 | kfree_rcu(fl, rcu); |
60e8fbc4 | 113 | } |
1da177e4 LT |
114 | } |
115 | ||
116 | static void fl_release(struct ip6_flowlabel *fl) | |
117 | { | |
d3aedd5e | 118 | spin_lock_bh(&ip6_fl_lock); |
1da177e4 LT |
119 | |
120 | fl->lastuse = jiffies; | |
121 | if (atomic_dec_and_test(&fl->users)) { | |
122 | unsigned long ttd = fl->lastuse + fl->linger; | |
123 | if (time_after(ttd, fl->expires)) | |
124 | fl->expires = ttd; | |
125 | ttd = fl->expires; | |
126 | if (fl->opt && fl->share == IPV6_FL_S_EXCL) { | |
127 | struct ipv6_txoptions *opt = fl->opt; | |
128 | fl->opt = NULL; | |
129 | kfree(opt); | |
130 | } | |
131 | if (!timer_pending(&ip6_fl_gc_timer) || | |
132 | time_after(ip6_fl_gc_timer.expires, ttd)) | |
133 | mod_timer(&ip6_fl_gc_timer, ttd); | |
134 | } | |
d3aedd5e | 135 | spin_unlock_bh(&ip6_fl_lock); |
1da177e4 LT |
136 | } |
137 | ||
138 | static void ip6_fl_gc(unsigned long dummy) | |
139 | { | |
140 | int i; | |
141 | unsigned long now = jiffies; | |
142 | unsigned long sched = 0; | |
143 | ||
d3aedd5e | 144 | spin_lock(&ip6_fl_lock); |
1da177e4 LT |
145 | |
146 | for (i=0; i<=FL_HASH_MASK; i++) { | |
7f0e44ac ED |
147 | struct ip6_flowlabel *fl; |
148 | struct ip6_flowlabel __rcu **flp; | |
149 | ||
1da177e4 | 150 | flp = &fl_ht[i]; |
d3aedd5e YH |
151 | while ((fl = rcu_dereference_protected(*flp, |
152 | lockdep_is_held(&ip6_fl_lock))) != NULL) { | |
1da177e4 LT |
153 | if (atomic_read(&fl->users) == 0) { |
154 | unsigned long ttd = fl->lastuse + fl->linger; | |
155 | if (time_after(ttd, fl->expires)) | |
156 | fl->expires = ttd; | |
157 | ttd = fl->expires; | |
158 | if (time_after_eq(now, ttd)) { | |
159 | *flp = fl->next; | |
160 | fl_free(fl); | |
161 | atomic_dec(&fl_size); | |
162 | continue; | |
163 | } | |
164 | if (!sched || time_before(ttd, sched)) | |
165 | sched = ttd; | |
166 | } | |
167 | flp = &fl->next; | |
168 | } | |
169 | } | |
170 | if (!sched && atomic_read(&fl_size)) | |
171 | sched = now + FL_MAX_LINGER; | |
172 | if (sched) { | |
60e8fbc4 | 173 | mod_timer(&ip6_fl_gc_timer, sched); |
1da177e4 | 174 | } |
d3aedd5e | 175 | spin_unlock(&ip6_fl_lock); |
1da177e4 LT |
176 | } |
177 | ||
2c8c1e72 | 178 | static void __net_exit ip6_fl_purge(struct net *net) |
60e8fbc4 BT |
179 | { |
180 | int i; | |
181 | ||
d3aedd5e | 182 | spin_lock(&ip6_fl_lock); |
60e8fbc4 | 183 | for (i = 0; i <= FL_HASH_MASK; i++) { |
7f0e44ac ED |
184 | struct ip6_flowlabel *fl; |
185 | struct ip6_flowlabel __rcu **flp; | |
186 | ||
60e8fbc4 | 187 | flp = &fl_ht[i]; |
d3aedd5e YH |
188 | while ((fl = rcu_dereference_protected(*flp, |
189 | lockdep_is_held(&ip6_fl_lock))) != NULL) { | |
09ad9bc7 OP |
190 | if (net_eq(fl->fl_net, net) && |
191 | atomic_read(&fl->users) == 0) { | |
60e8fbc4 BT |
192 | *flp = fl->next; |
193 | fl_free(fl); | |
194 | atomic_dec(&fl_size); | |
195 | continue; | |
196 | } | |
197 | flp = &fl->next; | |
198 | } | |
199 | } | |
d3aedd5e | 200 | spin_unlock(&ip6_fl_lock); |
60e8fbc4 BT |
201 | } |
202 | ||
203 | static struct ip6_flowlabel *fl_intern(struct net *net, | |
204 | struct ip6_flowlabel *fl, __be32 label) | |
1da177e4 | 205 | { |
78c2e502 PE |
206 | struct ip6_flowlabel *lfl; |
207 | ||
1da177e4 LT |
208 | fl->label = label & IPV6_FLOWLABEL_MASK; |
209 | ||
d3aedd5e | 210 | spin_lock_bh(&ip6_fl_lock); |
1da177e4 LT |
211 | if (label == 0) { |
212 | for (;;) { | |
213 | fl->label = htonl(net_random())&IPV6_FLOWLABEL_MASK; | |
214 | if (fl->label) { | |
60e8fbc4 | 215 | lfl = __fl_lookup(net, fl->label); |
1da177e4 LT |
216 | if (lfl == NULL) |
217 | break; | |
218 | } | |
219 | } | |
78c2e502 PE |
220 | } else { |
221 | /* | |
222 | * we dropper the ip6_fl_lock, so this entry could reappear | |
223 | * and we need to recheck with it. | |
224 | * | |
225 | * OTOH no need to search the active socket first, like it is | |
226 | * done in ipv6_flowlabel_opt - sock is locked, so new entry | |
227 | * with the same label can only appear on another sock | |
228 | */ | |
60e8fbc4 | 229 | lfl = __fl_lookup(net, fl->label); |
78c2e502 PE |
230 | if (lfl != NULL) { |
231 | atomic_inc(&lfl->users); | |
d3aedd5e | 232 | spin_unlock_bh(&ip6_fl_lock); |
78c2e502 PE |
233 | return lfl; |
234 | } | |
1da177e4 LT |
235 | } |
236 | ||
237 | fl->lastuse = jiffies; | |
238 | fl->next = fl_ht[FL_HASH(fl->label)]; | |
d3aedd5e | 239 | rcu_assign_pointer(fl_ht[FL_HASH(fl->label)], fl); |
1da177e4 | 240 | atomic_inc(&fl_size); |
d3aedd5e | 241 | spin_unlock_bh(&ip6_fl_lock); |
78c2e502 | 242 | return NULL; |
1da177e4 LT |
243 | } |
244 | ||
245 | ||
246 | ||
247 | /* Socket flowlabel lists */ | |
248 | ||
90bcaf7b | 249 | struct ip6_flowlabel * fl6_sock_lookup(struct sock *sk, __be32 label) |
1da177e4 LT |
250 | { |
251 | struct ipv6_fl_socklist *sfl; | |
252 | struct ipv6_pinfo *np = inet6_sk(sk); | |
253 | ||
254 | label &= IPV6_FLOWLABEL_MASK; | |
255 | ||
18367681 YH |
256 | rcu_read_lock_bh(); |
257 | for_each_sk_fl_rcu(np, sfl) { | |
1da177e4 LT |
258 | struct ip6_flowlabel *fl = sfl->fl; |
259 | if (fl->label == label) { | |
260 | fl->lastuse = jiffies; | |
261 | atomic_inc(&fl->users); | |
18367681 | 262 | rcu_read_unlock_bh(); |
1da177e4 LT |
263 | return fl; |
264 | } | |
265 | } | |
18367681 | 266 | rcu_read_unlock_bh(); |
1da177e4 LT |
267 | return NULL; |
268 | } | |
269 | ||
3cf3dc6c ACM |
270 | EXPORT_SYMBOL_GPL(fl6_sock_lookup); |
271 | ||
1da177e4 LT |
272 | void fl6_free_socklist(struct sock *sk) |
273 | { | |
274 | struct ipv6_pinfo *np = inet6_sk(sk); | |
275 | struct ipv6_fl_socklist *sfl; | |
276 | ||
18367681 | 277 | if (!rcu_access_pointer(np->ipv6_fl_list)) |
f256dc59 YH |
278 | return; |
279 | ||
18367681 YH |
280 | spin_lock_bh(&ip6_sk_fl_lock); |
281 | while ((sfl = rcu_dereference_protected(np->ipv6_fl_list, | |
282 | lockdep_is_held(&ip6_sk_fl_lock))) != NULL) { | |
283 | np->ipv6_fl_list = sfl->next; | |
284 | spin_unlock_bh(&ip6_sk_fl_lock); | |
f256dc59 | 285 | |
1da177e4 | 286 | fl_release(sfl->fl); |
18367681 YH |
287 | kfree_rcu(sfl, rcu); |
288 | ||
289 | spin_lock_bh(&ip6_sk_fl_lock); | |
1da177e4 | 290 | } |
18367681 | 291 | spin_unlock_bh(&ip6_sk_fl_lock); |
1da177e4 LT |
292 | } |
293 | ||
294 | /* Service routines */ | |
295 | ||
296 | ||
297 | /* | |
298 | It is the only difficult place. flowlabel enforces equal headers | |
299 | before and including routing header, however user may supply options | |
300 | following rthdr. | |
301 | */ | |
302 | ||
303 | struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions * opt_space, | |
304 | struct ip6_flowlabel * fl, | |
305 | struct ipv6_txoptions * fopt) | |
306 | { | |
df9890c3 | 307 | struct ipv6_txoptions * fl_opt = fl->opt; |
1ab1457c | 308 | |
df9890c3 YH |
309 | if (fopt == NULL || fopt->opt_flen == 0) |
310 | return fl_opt; | |
1ab1457c | 311 | |
1da177e4 LT |
312 | if (fl_opt != NULL) { |
313 | opt_space->hopopt = fl_opt->hopopt; | |
df9890c3 | 314 | opt_space->dst0opt = fl_opt->dst0opt; |
1da177e4 LT |
315 | opt_space->srcrt = fl_opt->srcrt; |
316 | opt_space->opt_nflen = fl_opt->opt_nflen; | |
317 | } else { | |
318 | if (fopt->opt_nflen == 0) | |
319 | return fopt; | |
320 | opt_space->hopopt = NULL; | |
321 | opt_space->dst0opt = NULL; | |
322 | opt_space->srcrt = NULL; | |
323 | opt_space->opt_nflen = 0; | |
324 | } | |
325 | opt_space->dst1opt = fopt->dst1opt; | |
1da177e4 LT |
326 | opt_space->opt_flen = fopt->opt_flen; |
327 | return opt_space; | |
328 | } | |
a495f836 | 329 | EXPORT_SYMBOL_GPL(fl6_merge_options); |
1da177e4 LT |
330 | |
331 | static unsigned long check_linger(unsigned long ttl) | |
332 | { | |
333 | if (ttl < FL_MIN_LINGER) | |
334 | return FL_MIN_LINGER*HZ; | |
335 | if (ttl > FL_MAX_LINGER && !capable(CAP_NET_ADMIN)) | |
336 | return 0; | |
337 | return ttl*HZ; | |
338 | } | |
339 | ||
340 | static int fl6_renew(struct ip6_flowlabel *fl, unsigned long linger, unsigned long expires) | |
341 | { | |
342 | linger = check_linger(linger); | |
343 | if (!linger) | |
344 | return -EPERM; | |
345 | expires = check_linger(expires); | |
346 | if (!expires) | |
347 | return -EPERM; | |
394055f6 FF |
348 | |
349 | spin_lock_bh(&ip6_fl_lock); | |
1da177e4 LT |
350 | fl->lastuse = jiffies; |
351 | if (time_before(fl->linger, linger)) | |
352 | fl->linger = linger; | |
353 | if (time_before(expires, fl->linger)) | |
354 | expires = fl->linger; | |
355 | if (time_before(fl->expires, fl->lastuse + expires)) | |
356 | fl->expires = fl->lastuse + expires; | |
394055f6 FF |
357 | spin_unlock_bh(&ip6_fl_lock); |
358 | ||
1da177e4 LT |
359 | return 0; |
360 | } | |
361 | ||
362 | static struct ip6_flowlabel * | |
ec0506db MŻ |
363 | fl_create(struct net *net, struct sock *sk, struct in6_flowlabel_req *freq, |
364 | char __user *optval, int optlen, int *err_p) | |
1da177e4 | 365 | { |
684de409 | 366 | struct ip6_flowlabel *fl = NULL; |
1da177e4 LT |
367 | int olen; |
368 | int addr_type; | |
369 | int err; | |
370 | ||
684de409 DM |
371 | olen = optlen - CMSG_ALIGN(sizeof(*freq)); |
372 | err = -EINVAL; | |
373 | if (olen > 64 * 1024) | |
374 | goto done; | |
375 | ||
1da177e4 | 376 | err = -ENOMEM; |
0c600eda | 377 | fl = kzalloc(sizeof(*fl), GFP_KERNEL); |
1da177e4 LT |
378 | if (fl == NULL) |
379 | goto done; | |
1da177e4 | 380 | |
1da177e4 LT |
381 | if (olen > 0) { |
382 | struct msghdr msg; | |
4c9483b2 | 383 | struct flowi6 flowi6; |
1da177e4 LT |
384 | int junk; |
385 | ||
386 | err = -ENOMEM; | |
387 | fl->opt = kmalloc(sizeof(*fl->opt) + olen, GFP_KERNEL); | |
388 | if (fl->opt == NULL) | |
389 | goto done; | |
390 | ||
391 | memset(fl->opt, 0, sizeof(*fl->opt)); | |
392 | fl->opt->tot_len = sizeof(*fl->opt) + olen; | |
393 | err = -EFAULT; | |
394 | if (copy_from_user(fl->opt+1, optval+CMSG_ALIGN(sizeof(*freq)), olen)) | |
395 | goto done; | |
396 | ||
397 | msg.msg_controllen = olen; | |
398 | msg.msg_control = (void*)(fl->opt+1); | |
4c9483b2 | 399 | memset(&flowi6, 0, sizeof(flowi6)); |
1da177e4 | 400 | |
73df66f8 TP |
401 | err = ip6_datagram_send_ctl(net, sk, &msg, &flowi6, fl->opt, |
402 | &junk, &junk, &junk); | |
1da177e4 LT |
403 | if (err) |
404 | goto done; | |
405 | err = -EINVAL; | |
406 | if (fl->opt->opt_flen) | |
407 | goto done; | |
408 | if (fl->opt->opt_nflen == 0) { | |
409 | kfree(fl->opt); | |
410 | fl->opt = NULL; | |
411 | } | |
412 | } | |
413 | ||
60e8fbc4 | 414 | fl->fl_net = hold_net(net); |
1da177e4 LT |
415 | fl->expires = jiffies; |
416 | err = fl6_renew(fl, freq->flr_linger, freq->flr_expires); | |
417 | if (err) | |
418 | goto done; | |
419 | fl->share = freq->flr_share; | |
420 | addr_type = ipv6_addr_type(&freq->flr_dst); | |
35700212 JP |
421 | if ((addr_type & IPV6_ADDR_MAPPED) || |
422 | addr_type == IPV6_ADDR_ANY) { | |
c6817e4c | 423 | err = -EINVAL; |
1da177e4 | 424 | goto done; |
c6817e4c | 425 | } |
4e3fd7a0 | 426 | fl->dst = freq->flr_dst; |
1da177e4 LT |
427 | atomic_set(&fl->users, 1); |
428 | switch (fl->share) { | |
429 | case IPV6_FL_S_EXCL: | |
430 | case IPV6_FL_S_ANY: | |
431 | break; | |
432 | case IPV6_FL_S_PROCESS: | |
4f82f457 | 433 | fl->owner.pid = get_task_pid(current, PIDTYPE_PID); |
1da177e4 LT |
434 | break; |
435 | case IPV6_FL_S_USER: | |
4f82f457 | 436 | fl->owner.uid = current_euid(); |
1da177e4 LT |
437 | break; |
438 | default: | |
439 | err = -EINVAL; | |
440 | goto done; | |
441 | } | |
442 | return fl; | |
443 | ||
444 | done: | |
445 | fl_free(fl); | |
446 | *err_p = err; | |
447 | return NULL; | |
448 | } | |
449 | ||
450 | static int mem_check(struct sock *sk) | |
451 | { | |
452 | struct ipv6_pinfo *np = inet6_sk(sk); | |
453 | struct ipv6_fl_socklist *sfl; | |
454 | int room = FL_MAX_SIZE - atomic_read(&fl_size); | |
455 | int count = 0; | |
456 | ||
457 | if (room > FL_MAX_SIZE - FL_MAX_PER_SOCK) | |
458 | return 0; | |
459 | ||
f8c31c8f | 460 | rcu_read_lock_bh(); |
18367681 | 461 | for_each_sk_fl_rcu(np, sfl) |
1da177e4 | 462 | count++; |
f8c31c8f | 463 | rcu_read_unlock_bh(); |
1da177e4 LT |
464 | |
465 | if (room <= 0 || | |
466 | ((count >= FL_MAX_PER_SOCK || | |
35700212 JP |
467 | (count > 0 && room < FL_MAX_SIZE/2) || room < FL_MAX_SIZE/4) && |
468 | !capable(CAP_NET_ADMIN))) | |
1da177e4 LT |
469 | return -ENOBUFS; |
470 | ||
471 | return 0; | |
472 | } | |
473 | ||
04028045 PE |
474 | static inline void fl_link(struct ipv6_pinfo *np, struct ipv6_fl_socklist *sfl, |
475 | struct ip6_flowlabel *fl) | |
476 | { | |
18367681 | 477 | spin_lock_bh(&ip6_sk_fl_lock); |
04028045 PE |
478 | sfl->fl = fl; |
479 | sfl->next = np->ipv6_fl_list; | |
18367681 YH |
480 | rcu_assign_pointer(np->ipv6_fl_list, sfl); |
481 | spin_unlock_bh(&ip6_sk_fl_lock); | |
04028045 PE |
482 | } |
483 | ||
3fdfa5ff FF |
484 | int ipv6_flowlabel_opt_get(struct sock *sk, struct in6_flowlabel_req *freq) |
485 | { | |
486 | struct ipv6_pinfo *np = inet6_sk(sk); | |
487 | struct ipv6_fl_socklist *sfl; | |
488 | ||
489 | rcu_read_lock_bh(); | |
490 | ||
491 | for_each_sk_fl_rcu(np, sfl) { | |
492 | if (sfl->fl->label == (np->flow_label & IPV6_FLOWLABEL_MASK)) { | |
493 | spin_lock_bh(&ip6_fl_lock); | |
494 | freq->flr_label = sfl->fl->label; | |
495 | freq->flr_dst = sfl->fl->dst; | |
496 | freq->flr_share = sfl->fl->share; | |
497 | freq->flr_expires = (sfl->fl->expires - jiffies) / HZ; | |
498 | freq->flr_linger = sfl->fl->linger / HZ; | |
499 | ||
500 | spin_unlock_bh(&ip6_fl_lock); | |
501 | rcu_read_unlock_bh(); | |
502 | return 0; | |
503 | } | |
504 | } | |
505 | rcu_read_unlock_bh(); | |
506 | ||
507 | return -ENOENT; | |
508 | } | |
509 | ||
1da177e4 LT |
510 | int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen) |
511 | { | |
55205d40 | 512 | int uninitialized_var(err); |
60e8fbc4 | 513 | struct net *net = sock_net(sk); |
1da177e4 LT |
514 | struct ipv6_pinfo *np = inet6_sk(sk); |
515 | struct in6_flowlabel_req freq; | |
516 | struct ipv6_fl_socklist *sfl1=NULL; | |
7f0e44ac ED |
517 | struct ipv6_fl_socklist *sfl; |
518 | struct ipv6_fl_socklist __rcu **sflp; | |
78c2e502 PE |
519 | struct ip6_flowlabel *fl, *fl1 = NULL; |
520 | ||
1da177e4 LT |
521 | |
522 | if (optlen < sizeof(freq)) | |
523 | return -EINVAL; | |
524 | ||
525 | if (copy_from_user(&freq, optval, sizeof(freq))) | |
526 | return -EFAULT; | |
527 | ||
528 | switch (freq.flr_action) { | |
529 | case IPV6_FL_A_PUT: | |
18367681 YH |
530 | spin_lock_bh(&ip6_sk_fl_lock); |
531 | for (sflp = &np->ipv6_fl_list; | |
532 | (sfl = rcu_dereference(*sflp))!=NULL; | |
533 | sflp = &sfl->next) { | |
1da177e4 LT |
534 | if (sfl->fl->label == freq.flr_label) { |
535 | if (freq.flr_label == (np->flow_label&IPV6_FLOWLABEL_MASK)) | |
536 | np->flow_label &= ~IPV6_FLOWLABEL_MASK; | |
18367681 YH |
537 | *sflp = rcu_dereference(sfl->next); |
538 | spin_unlock_bh(&ip6_sk_fl_lock); | |
1da177e4 | 539 | fl_release(sfl->fl); |
18367681 | 540 | kfree_rcu(sfl, rcu); |
1da177e4 LT |
541 | return 0; |
542 | } | |
543 | } | |
18367681 | 544 | spin_unlock_bh(&ip6_sk_fl_lock); |
1da177e4 LT |
545 | return -ESRCH; |
546 | ||
547 | case IPV6_FL_A_RENEW: | |
18367681 YH |
548 | rcu_read_lock_bh(); |
549 | for_each_sk_fl_rcu(np, sfl) { | |
1da177e4 LT |
550 | if (sfl->fl->label == freq.flr_label) { |
551 | err = fl6_renew(sfl->fl, freq.flr_linger, freq.flr_expires); | |
18367681 | 552 | rcu_read_unlock_bh(); |
1da177e4 LT |
553 | return err; |
554 | } | |
555 | } | |
18367681 | 556 | rcu_read_unlock_bh(); |
1da177e4 | 557 | |
af31f412 EB |
558 | if (freq.flr_share == IPV6_FL_S_NONE && |
559 | ns_capable(net->user_ns, CAP_NET_ADMIN)) { | |
60e8fbc4 | 560 | fl = fl_lookup(net, freq.flr_label); |
1da177e4 LT |
561 | if (fl) { |
562 | err = fl6_renew(fl, freq.flr_linger, freq.flr_expires); | |
563 | fl_release(fl); | |
564 | return err; | |
565 | } | |
566 | } | |
567 | return -ESRCH; | |
568 | ||
569 | case IPV6_FL_A_GET: | |
570 | if (freq.flr_label & ~IPV6_FLOWLABEL_MASK) | |
571 | return -EINVAL; | |
572 | ||
ec0506db | 573 | fl = fl_create(net, sk, &freq, optval, optlen, &err); |
1da177e4 LT |
574 | if (fl == NULL) |
575 | return err; | |
576 | sfl1 = kmalloc(sizeof(*sfl1), GFP_KERNEL); | |
577 | ||
578 | if (freq.flr_label) { | |
1da177e4 | 579 | err = -EEXIST; |
18367681 YH |
580 | rcu_read_lock_bh(); |
581 | for_each_sk_fl_rcu(np, sfl) { | |
1da177e4 LT |
582 | if (sfl->fl->label == freq.flr_label) { |
583 | if (freq.flr_flags&IPV6_FL_F_EXCL) { | |
18367681 | 584 | rcu_read_unlock_bh(); |
1da177e4 LT |
585 | goto done; |
586 | } | |
587 | fl1 = sfl->fl; | |
4ea6a804 | 588 | atomic_inc(&fl1->users); |
1da177e4 LT |
589 | break; |
590 | } | |
591 | } | |
18367681 | 592 | rcu_read_unlock_bh(); |
1da177e4 LT |
593 | |
594 | if (fl1 == NULL) | |
60e8fbc4 | 595 | fl1 = fl_lookup(net, freq.flr_label); |
1da177e4 | 596 | if (fl1) { |
78c2e502 | 597 | recheck: |
1da177e4 LT |
598 | err = -EEXIST; |
599 | if (freq.flr_flags&IPV6_FL_F_EXCL) | |
600 | goto release; | |
601 | err = -EPERM; | |
602 | if (fl1->share == IPV6_FL_S_EXCL || | |
603 | fl1->share != fl->share || | |
4f82f457 EB |
604 | ((fl1->share == IPV6_FL_S_PROCESS) && |
605 | (fl1->owner.pid == fl->owner.pid)) || | |
606 | ((fl1->share == IPV6_FL_S_USER) && | |
607 | uid_eq(fl1->owner.uid, fl->owner.uid))) | |
1da177e4 LT |
608 | goto release; |
609 | ||
1da177e4 LT |
610 | err = -ENOMEM; |
611 | if (sfl1 == NULL) | |
612 | goto release; | |
613 | if (fl->linger > fl1->linger) | |
614 | fl1->linger = fl->linger; | |
615 | if ((long)(fl->expires - fl1->expires) > 0) | |
616 | fl1->expires = fl->expires; | |
04028045 | 617 | fl_link(np, sfl1, fl1); |
1da177e4 LT |
618 | fl_free(fl); |
619 | return 0; | |
620 | ||
621 | release: | |
622 | fl_release(fl1); | |
623 | goto done; | |
624 | } | |
625 | } | |
626 | err = -ENOENT; | |
627 | if (!(freq.flr_flags&IPV6_FL_F_CREATE)) | |
628 | goto done; | |
629 | ||
630 | err = -ENOMEM; | |
631 | if (sfl1 == NULL || (err = mem_check(sk)) != 0) | |
632 | goto done; | |
633 | ||
60e8fbc4 | 634 | fl1 = fl_intern(net, fl, freq.flr_label); |
78c2e502 PE |
635 | if (fl1 != NULL) |
636 | goto recheck; | |
1da177e4 | 637 | |
6c94d361 DM |
638 | if (!freq.flr_label) { |
639 | if (copy_to_user(&((struct in6_flowlabel_req __user *) optval)->flr_label, | |
640 | &fl->label, sizeof(fl->label))) { | |
641 | /* Intentionally ignore fault. */ | |
642 | } | |
643 | } | |
1da177e4 | 644 | |
04028045 | 645 | fl_link(np, sfl1, fl); |
1da177e4 LT |
646 | return 0; |
647 | ||
648 | default: | |
649 | return -EINVAL; | |
650 | } | |
651 | ||
652 | done: | |
653 | fl_free(fl); | |
654 | kfree(sfl1); | |
655 | return err; | |
656 | } | |
657 | ||
658 | #ifdef CONFIG_PROC_FS | |
659 | ||
660 | struct ip6fl_iter_state { | |
5983a3df | 661 | struct seq_net_private p; |
4f82f457 | 662 | struct pid_namespace *pid_ns; |
1da177e4 LT |
663 | int bucket; |
664 | }; | |
665 | ||
666 | #define ip6fl_seq_private(seq) ((struct ip6fl_iter_state *)(seq)->private) | |
667 | ||
668 | static struct ip6_flowlabel *ip6fl_get_first(struct seq_file *seq) | |
669 | { | |
670 | struct ip6_flowlabel *fl = NULL; | |
671 | struct ip6fl_iter_state *state = ip6fl_seq_private(seq); | |
5983a3df | 672 | struct net *net = seq_file_net(seq); |
1da177e4 LT |
673 | |
674 | for (state->bucket = 0; state->bucket <= FL_HASH_MASK; ++state->bucket) { | |
d3aedd5e YH |
675 | for_each_fl_rcu(state->bucket, fl) { |
676 | if (net_eq(fl->fl_net, net)) | |
677 | goto out; | |
678 | } | |
1da177e4 | 679 | } |
d3aedd5e YH |
680 | fl = NULL; |
681 | out: | |
1da177e4 LT |
682 | return fl; |
683 | } | |
684 | ||
685 | static struct ip6_flowlabel *ip6fl_get_next(struct seq_file *seq, struct ip6_flowlabel *fl) | |
686 | { | |
687 | struct ip6fl_iter_state *state = ip6fl_seq_private(seq); | |
5983a3df | 688 | struct net *net = seq_file_net(seq); |
1da177e4 | 689 | |
d3aedd5e YH |
690 | for_each_fl_continue_rcu(fl) { |
691 | if (net_eq(fl->fl_net, net)) | |
692 | goto out; | |
693 | } | |
694 | ||
5983a3df | 695 | try_again: |
d3aedd5e YH |
696 | if (++state->bucket <= FL_HASH_MASK) { |
697 | for_each_fl_rcu(state->bucket, fl) { | |
698 | if (net_eq(fl->fl_net, net)) | |
699 | goto out; | |
700 | } | |
701 | goto try_again; | |
1da177e4 | 702 | } |
d3aedd5e YH |
703 | fl = NULL; |
704 | ||
705 | out: | |
1da177e4 LT |
706 | return fl; |
707 | } | |
708 | ||
709 | static struct ip6_flowlabel *ip6fl_get_idx(struct seq_file *seq, loff_t pos) | |
710 | { | |
711 | struct ip6_flowlabel *fl = ip6fl_get_first(seq); | |
712 | if (fl) | |
713 | while (pos && (fl = ip6fl_get_next(seq, fl)) != NULL) | |
714 | --pos; | |
715 | return pos ? NULL : fl; | |
716 | } | |
717 | ||
718 | static void *ip6fl_seq_start(struct seq_file *seq, loff_t *pos) | |
d3aedd5e | 719 | __acquires(RCU) |
1da177e4 | 720 | { |
d3aedd5e | 721 | rcu_read_lock_bh(); |
1da177e4 LT |
722 | return *pos ? ip6fl_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; |
723 | } | |
724 | ||
725 | static void *ip6fl_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
726 | { | |
727 | struct ip6_flowlabel *fl; | |
728 | ||
729 | if (v == SEQ_START_TOKEN) | |
730 | fl = ip6fl_get_first(seq); | |
731 | else | |
732 | fl = ip6fl_get_next(seq, v); | |
733 | ++*pos; | |
734 | return fl; | |
735 | } | |
736 | ||
737 | static void ip6fl_seq_stop(struct seq_file *seq, void *v) | |
d3aedd5e | 738 | __releases(RCU) |
1da177e4 | 739 | { |
d3aedd5e | 740 | rcu_read_unlock_bh(); |
1da177e4 LT |
741 | } |
742 | ||
1b7c2dbc | 743 | static int ip6fl_seq_show(struct seq_file *seq, void *v) |
1da177e4 | 744 | { |
4f82f457 | 745 | struct ip6fl_iter_state *state = ip6fl_seq_private(seq); |
1b7c2dbc JM |
746 | if (v == SEQ_START_TOKEN) |
747 | seq_printf(seq, "%-5s %-1s %-6s %-6s %-6s %-8s %-32s %s\n", | |
748 | "Label", "S", "Owner", "Users", "Linger", "Expires", "Dst", "Opt"); | |
749 | else { | |
750 | struct ip6_flowlabel *fl = v; | |
1da177e4 | 751 | seq_printf(seq, |
4b7a4274 | 752 | "%05X %-1d %-6d %-6d %-6ld %-8ld %pi6 %-4d\n", |
95c96174 | 753 | (unsigned int)ntohl(fl->label), |
1da177e4 | 754 | fl->share, |
4f82f457 EB |
755 | ((fl->share == IPV6_FL_S_PROCESS) ? |
756 | pid_nr_ns(fl->owner.pid, state->pid_ns) : | |
757 | ((fl->share == IPV6_FL_S_USER) ? | |
758 | from_kuid_munged(seq_user_ns(seq), fl->owner.uid) : | |
759 | 0)), | |
1da177e4 LT |
760 | atomic_read(&fl->users), |
761 | fl->linger/HZ, | |
762 | (long)(fl->expires - jiffies)/HZ, | |
b071195d | 763 | &fl->dst, |
1da177e4 | 764 | fl->opt ? fl->opt->opt_nflen : 0); |
1da177e4 | 765 | } |
1da177e4 LT |
766 | return 0; |
767 | } | |
768 | ||
56b3d975 | 769 | static const struct seq_operations ip6fl_seq_ops = { |
1da177e4 LT |
770 | .start = ip6fl_seq_start, |
771 | .next = ip6fl_seq_next, | |
772 | .stop = ip6fl_seq_stop, | |
773 | .show = ip6fl_seq_show, | |
774 | }; | |
775 | ||
776 | static int ip6fl_seq_open(struct inode *inode, struct file *file) | |
777 | { | |
4f82f457 EB |
778 | struct seq_file *seq; |
779 | struct ip6fl_iter_state *state; | |
780 | int err; | |
781 | ||
782 | err = seq_open_net(inode, file, &ip6fl_seq_ops, | |
783 | sizeof(struct ip6fl_iter_state)); | |
784 | ||
785 | if (!err) { | |
786 | seq = file->private_data; | |
787 | state = ip6fl_seq_private(seq); | |
788 | rcu_read_lock(); | |
789 | state->pid_ns = get_pid_ns(task_active_pid_ns(current)); | |
790 | rcu_read_unlock(); | |
791 | } | |
792 | return err; | |
793 | } | |
794 | ||
795 | static int ip6fl_seq_release(struct inode *inode, struct file *file) | |
796 | { | |
797 | struct seq_file *seq = file->private_data; | |
798 | struct ip6fl_iter_state *state = ip6fl_seq_private(seq); | |
799 | put_pid_ns(state->pid_ns); | |
800 | return seq_release_net(inode, file); | |
1da177e4 LT |
801 | } |
802 | ||
9a32144e | 803 | static const struct file_operations ip6fl_seq_fops = { |
1da177e4 LT |
804 | .owner = THIS_MODULE, |
805 | .open = ip6fl_seq_open, | |
806 | .read = seq_read, | |
807 | .llseek = seq_lseek, | |
4f82f457 | 808 | .release = ip6fl_seq_release, |
1da177e4 | 809 | }; |
1da177e4 | 810 | |
2c8c1e72 | 811 | static int __net_init ip6_flowlabel_proc_init(struct net *net) |
0a3e78ac | 812 | { |
d4beaa66 G |
813 | if (!proc_create("ip6_flowlabel", S_IRUGO, net->proc_net, |
814 | &ip6fl_seq_fops)) | |
0a3e78ac DL |
815 | return -ENOMEM; |
816 | return 0; | |
817 | } | |
1da177e4 | 818 | |
2c8c1e72 | 819 | static void __net_exit ip6_flowlabel_proc_fini(struct net *net) |
1da177e4 | 820 | { |
ece31ffd | 821 | remove_proc_entry("ip6_flowlabel", net->proc_net); |
0a3e78ac DL |
822 | } |
823 | #else | |
824 | static inline int ip6_flowlabel_proc_init(struct net *net) | |
825 | { | |
826 | return 0; | |
827 | } | |
828 | static inline void ip6_flowlabel_proc_fini(struct net *net) | |
829 | { | |
0a3e78ac | 830 | } |
1da177e4 | 831 | #endif |
0a3e78ac | 832 | |
2c8c1e72 | 833 | static void __net_exit ip6_flowlabel_net_exit(struct net *net) |
60e8fbc4 BT |
834 | { |
835 | ip6_fl_purge(net); | |
5983a3df | 836 | ip6_flowlabel_proc_fini(net); |
60e8fbc4 BT |
837 | } |
838 | ||
839 | static struct pernet_operations ip6_flowlabel_net_ops = { | |
5983a3df | 840 | .init = ip6_flowlabel_proc_init, |
60e8fbc4 BT |
841 | .exit = ip6_flowlabel_net_exit, |
842 | }; | |
843 | ||
0a3e78ac DL |
844 | int ip6_flowlabel_init(void) |
845 | { | |
5983a3df | 846 | return register_pernet_subsys(&ip6_flowlabel_net_ops); |
1da177e4 LT |
847 | } |
848 | ||
849 | void ip6_flowlabel_cleanup(void) | |
850 | { | |
851 | del_timer(&ip6_fl_gc_timer); | |
60e8fbc4 | 852 | unregister_pernet_subsys(&ip6_flowlabel_net_ops); |
1da177e4 | 853 | } |