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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); | |
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++) { | |
147 | struct ip6_flowlabel *fl, **flp; | |
148 | flp = &fl_ht[i]; | |
d3aedd5e YH |
149 | while ((fl = rcu_dereference_protected(*flp, |
150 | lockdep_is_held(&ip6_fl_lock))) != NULL) { | |
1da177e4 LT |
151 | if (atomic_read(&fl->users) == 0) { |
152 | unsigned long ttd = fl->lastuse + fl->linger; | |
153 | if (time_after(ttd, fl->expires)) | |
154 | fl->expires = ttd; | |
155 | ttd = fl->expires; | |
156 | if (time_after_eq(now, ttd)) { | |
157 | *flp = fl->next; | |
158 | fl_free(fl); | |
159 | atomic_dec(&fl_size); | |
160 | continue; | |
161 | } | |
162 | if (!sched || time_before(ttd, sched)) | |
163 | sched = ttd; | |
164 | } | |
165 | flp = &fl->next; | |
166 | } | |
167 | } | |
168 | if (!sched && atomic_read(&fl_size)) | |
169 | sched = now + FL_MAX_LINGER; | |
170 | if (sched) { | |
60e8fbc4 | 171 | mod_timer(&ip6_fl_gc_timer, sched); |
1da177e4 | 172 | } |
d3aedd5e | 173 | spin_unlock(&ip6_fl_lock); |
1da177e4 LT |
174 | } |
175 | ||
2c8c1e72 | 176 | static void __net_exit ip6_fl_purge(struct net *net) |
60e8fbc4 BT |
177 | { |
178 | int i; | |
179 | ||
d3aedd5e | 180 | spin_lock(&ip6_fl_lock); |
60e8fbc4 BT |
181 | for (i = 0; i <= FL_HASH_MASK; i++) { |
182 | struct ip6_flowlabel *fl, **flp; | |
183 | flp = &fl_ht[i]; | |
d3aedd5e YH |
184 | while ((fl = rcu_dereference_protected(*flp, |
185 | lockdep_is_held(&ip6_fl_lock))) != NULL) { | |
09ad9bc7 OP |
186 | if (net_eq(fl->fl_net, net) && |
187 | atomic_read(&fl->users) == 0) { | |
60e8fbc4 BT |
188 | *flp = fl->next; |
189 | fl_free(fl); | |
190 | atomic_dec(&fl_size); | |
191 | continue; | |
192 | } | |
193 | flp = &fl->next; | |
194 | } | |
195 | } | |
d3aedd5e | 196 | spin_unlock(&ip6_fl_lock); |
60e8fbc4 BT |
197 | } |
198 | ||
199 | static struct ip6_flowlabel *fl_intern(struct net *net, | |
200 | struct ip6_flowlabel *fl, __be32 label) | |
1da177e4 | 201 | { |
78c2e502 PE |
202 | struct ip6_flowlabel *lfl; |
203 | ||
1da177e4 LT |
204 | fl->label = label & IPV6_FLOWLABEL_MASK; |
205 | ||
d3aedd5e | 206 | spin_lock_bh(&ip6_fl_lock); |
1da177e4 LT |
207 | if (label == 0) { |
208 | for (;;) { | |
209 | fl->label = htonl(net_random())&IPV6_FLOWLABEL_MASK; | |
210 | if (fl->label) { | |
60e8fbc4 | 211 | lfl = __fl_lookup(net, fl->label); |
1da177e4 LT |
212 | if (lfl == NULL) |
213 | break; | |
214 | } | |
215 | } | |
78c2e502 PE |
216 | } else { |
217 | /* | |
218 | * we dropper the ip6_fl_lock, so this entry could reappear | |
219 | * and we need to recheck with it. | |
220 | * | |
221 | * OTOH no need to search the active socket first, like it is | |
222 | * done in ipv6_flowlabel_opt - sock is locked, so new entry | |
223 | * with the same label can only appear on another sock | |
224 | */ | |
60e8fbc4 | 225 | lfl = __fl_lookup(net, fl->label); |
78c2e502 PE |
226 | if (lfl != NULL) { |
227 | atomic_inc(&lfl->users); | |
d3aedd5e | 228 | spin_unlock_bh(&ip6_fl_lock); |
78c2e502 PE |
229 | return lfl; |
230 | } | |
1da177e4 LT |
231 | } |
232 | ||
233 | fl->lastuse = jiffies; | |
234 | fl->next = fl_ht[FL_HASH(fl->label)]; | |
d3aedd5e | 235 | rcu_assign_pointer(fl_ht[FL_HASH(fl->label)], fl); |
1da177e4 | 236 | atomic_inc(&fl_size); |
d3aedd5e | 237 | spin_unlock_bh(&ip6_fl_lock); |
78c2e502 | 238 | return NULL; |
1da177e4 LT |
239 | } |
240 | ||
241 | ||
242 | ||
243 | /* Socket flowlabel lists */ | |
244 | ||
90bcaf7b | 245 | struct ip6_flowlabel * fl6_sock_lookup(struct sock *sk, __be32 label) |
1da177e4 LT |
246 | { |
247 | struct ipv6_fl_socklist *sfl; | |
248 | struct ipv6_pinfo *np = inet6_sk(sk); | |
249 | ||
250 | label &= IPV6_FLOWLABEL_MASK; | |
251 | ||
18367681 YH |
252 | rcu_read_lock_bh(); |
253 | for_each_sk_fl_rcu(np, sfl) { | |
1da177e4 LT |
254 | struct ip6_flowlabel *fl = sfl->fl; |
255 | if (fl->label == label) { | |
256 | fl->lastuse = jiffies; | |
257 | atomic_inc(&fl->users); | |
18367681 | 258 | rcu_read_unlock_bh(); |
1da177e4 LT |
259 | return fl; |
260 | } | |
261 | } | |
18367681 | 262 | rcu_read_unlock_bh(); |
1da177e4 LT |
263 | return NULL; |
264 | } | |
265 | ||
3cf3dc6c ACM |
266 | EXPORT_SYMBOL_GPL(fl6_sock_lookup); |
267 | ||
1da177e4 LT |
268 | void fl6_free_socklist(struct sock *sk) |
269 | { | |
270 | struct ipv6_pinfo *np = inet6_sk(sk); | |
271 | struct ipv6_fl_socklist *sfl; | |
272 | ||
18367681 | 273 | if (!rcu_access_pointer(np->ipv6_fl_list)) |
f256dc59 YH |
274 | return; |
275 | ||
18367681 YH |
276 | spin_lock_bh(&ip6_sk_fl_lock); |
277 | while ((sfl = rcu_dereference_protected(np->ipv6_fl_list, | |
278 | lockdep_is_held(&ip6_sk_fl_lock))) != NULL) { | |
279 | np->ipv6_fl_list = sfl->next; | |
280 | spin_unlock_bh(&ip6_sk_fl_lock); | |
f256dc59 | 281 | |
1da177e4 | 282 | fl_release(sfl->fl); |
18367681 YH |
283 | kfree_rcu(sfl, rcu); |
284 | ||
285 | spin_lock_bh(&ip6_sk_fl_lock); | |
1da177e4 | 286 | } |
18367681 | 287 | spin_unlock_bh(&ip6_sk_fl_lock); |
1da177e4 LT |
288 | } |
289 | ||
290 | /* Service routines */ | |
291 | ||
292 | ||
293 | /* | |
294 | It is the only difficult place. flowlabel enforces equal headers | |
295 | before and including routing header, however user may supply options | |
296 | following rthdr. | |
297 | */ | |
298 | ||
299 | struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions * opt_space, | |
300 | struct ip6_flowlabel * fl, | |
301 | struct ipv6_txoptions * fopt) | |
302 | { | |
df9890c3 | 303 | struct ipv6_txoptions * fl_opt = fl->opt; |
1ab1457c | 304 | |
df9890c3 YH |
305 | if (fopt == NULL || fopt->opt_flen == 0) |
306 | return fl_opt; | |
1ab1457c | 307 | |
1da177e4 LT |
308 | if (fl_opt != NULL) { |
309 | opt_space->hopopt = fl_opt->hopopt; | |
df9890c3 | 310 | opt_space->dst0opt = fl_opt->dst0opt; |
1da177e4 LT |
311 | opt_space->srcrt = fl_opt->srcrt; |
312 | opt_space->opt_nflen = fl_opt->opt_nflen; | |
313 | } else { | |
314 | if (fopt->opt_nflen == 0) | |
315 | return fopt; | |
316 | opt_space->hopopt = NULL; | |
317 | opt_space->dst0opt = NULL; | |
318 | opt_space->srcrt = NULL; | |
319 | opt_space->opt_nflen = 0; | |
320 | } | |
321 | opt_space->dst1opt = fopt->dst1opt; | |
1da177e4 LT |
322 | opt_space->opt_flen = fopt->opt_flen; |
323 | return opt_space; | |
324 | } | |
a495f836 | 325 | EXPORT_SYMBOL_GPL(fl6_merge_options); |
1da177e4 LT |
326 | |
327 | static unsigned long check_linger(unsigned long ttl) | |
328 | { | |
329 | if (ttl < FL_MIN_LINGER) | |
330 | return FL_MIN_LINGER*HZ; | |
331 | if (ttl > FL_MAX_LINGER && !capable(CAP_NET_ADMIN)) | |
332 | return 0; | |
333 | return ttl*HZ; | |
334 | } | |
335 | ||
336 | static int fl6_renew(struct ip6_flowlabel *fl, unsigned long linger, unsigned long expires) | |
337 | { | |
338 | linger = check_linger(linger); | |
339 | if (!linger) | |
340 | return -EPERM; | |
341 | expires = check_linger(expires); | |
342 | if (!expires) | |
343 | return -EPERM; | |
344 | fl->lastuse = jiffies; | |
345 | if (time_before(fl->linger, linger)) | |
346 | fl->linger = linger; | |
347 | if (time_before(expires, fl->linger)) | |
348 | expires = fl->linger; | |
349 | if (time_before(fl->expires, fl->lastuse + expires)) | |
350 | fl->expires = fl->lastuse + expires; | |
351 | return 0; | |
352 | } | |
353 | ||
354 | static struct ip6_flowlabel * | |
ec0506db MŻ |
355 | fl_create(struct net *net, struct sock *sk, struct in6_flowlabel_req *freq, |
356 | char __user *optval, int optlen, int *err_p) | |
1da177e4 | 357 | { |
684de409 | 358 | struct ip6_flowlabel *fl = NULL; |
1da177e4 LT |
359 | int olen; |
360 | int addr_type; | |
361 | int err; | |
362 | ||
684de409 DM |
363 | olen = optlen - CMSG_ALIGN(sizeof(*freq)); |
364 | err = -EINVAL; | |
365 | if (olen > 64 * 1024) | |
366 | goto done; | |
367 | ||
1da177e4 | 368 | err = -ENOMEM; |
0c600eda | 369 | fl = kzalloc(sizeof(*fl), GFP_KERNEL); |
1da177e4 LT |
370 | if (fl == NULL) |
371 | goto done; | |
1da177e4 | 372 | |
1da177e4 LT |
373 | if (olen > 0) { |
374 | struct msghdr msg; | |
4c9483b2 | 375 | struct flowi6 flowi6; |
1da177e4 LT |
376 | int junk; |
377 | ||
378 | err = -ENOMEM; | |
379 | fl->opt = kmalloc(sizeof(*fl->opt) + olen, GFP_KERNEL); | |
380 | if (fl->opt == NULL) | |
381 | goto done; | |
382 | ||
383 | memset(fl->opt, 0, sizeof(*fl->opt)); | |
384 | fl->opt->tot_len = sizeof(*fl->opt) + olen; | |
385 | err = -EFAULT; | |
386 | if (copy_from_user(fl->opt+1, optval+CMSG_ALIGN(sizeof(*freq)), olen)) | |
387 | goto done; | |
388 | ||
389 | msg.msg_controllen = olen; | |
390 | msg.msg_control = (void*)(fl->opt+1); | |
4c9483b2 | 391 | memset(&flowi6, 0, sizeof(flowi6)); |
1da177e4 | 392 | |
73df66f8 TP |
393 | err = ip6_datagram_send_ctl(net, sk, &msg, &flowi6, fl->opt, |
394 | &junk, &junk, &junk); | |
1da177e4 LT |
395 | if (err) |
396 | goto done; | |
397 | err = -EINVAL; | |
398 | if (fl->opt->opt_flen) | |
399 | goto done; | |
400 | if (fl->opt->opt_nflen == 0) { | |
401 | kfree(fl->opt); | |
402 | fl->opt = NULL; | |
403 | } | |
404 | } | |
405 | ||
60e8fbc4 | 406 | fl->fl_net = hold_net(net); |
1da177e4 LT |
407 | fl->expires = jiffies; |
408 | err = fl6_renew(fl, freq->flr_linger, freq->flr_expires); | |
409 | if (err) | |
410 | goto done; | |
411 | fl->share = freq->flr_share; | |
412 | addr_type = ipv6_addr_type(&freq->flr_dst); | |
35700212 JP |
413 | if ((addr_type & IPV6_ADDR_MAPPED) || |
414 | addr_type == IPV6_ADDR_ANY) { | |
c6817e4c | 415 | err = -EINVAL; |
1da177e4 | 416 | goto done; |
c6817e4c | 417 | } |
4e3fd7a0 | 418 | fl->dst = freq->flr_dst; |
1da177e4 LT |
419 | atomic_set(&fl->users, 1); |
420 | switch (fl->share) { | |
421 | case IPV6_FL_S_EXCL: | |
422 | case IPV6_FL_S_ANY: | |
423 | break; | |
424 | case IPV6_FL_S_PROCESS: | |
4f82f457 | 425 | fl->owner.pid = get_task_pid(current, PIDTYPE_PID); |
1da177e4 LT |
426 | break; |
427 | case IPV6_FL_S_USER: | |
4f82f457 | 428 | fl->owner.uid = current_euid(); |
1da177e4 LT |
429 | break; |
430 | default: | |
431 | err = -EINVAL; | |
432 | goto done; | |
433 | } | |
434 | return fl; | |
435 | ||
436 | done: | |
437 | fl_free(fl); | |
438 | *err_p = err; | |
439 | return NULL; | |
440 | } | |
441 | ||
442 | static int mem_check(struct sock *sk) | |
443 | { | |
444 | struct ipv6_pinfo *np = inet6_sk(sk); | |
445 | struct ipv6_fl_socklist *sfl; | |
446 | int room = FL_MAX_SIZE - atomic_read(&fl_size); | |
447 | int count = 0; | |
448 | ||
449 | if (room > FL_MAX_SIZE - FL_MAX_PER_SOCK) | |
450 | return 0; | |
451 | ||
18367681 | 452 | for_each_sk_fl_rcu(np, sfl) |
1da177e4 LT |
453 | count++; |
454 | ||
455 | if (room <= 0 || | |
456 | ((count >= FL_MAX_PER_SOCK || | |
35700212 JP |
457 | (count > 0 && room < FL_MAX_SIZE/2) || room < FL_MAX_SIZE/4) && |
458 | !capable(CAP_NET_ADMIN))) | |
1da177e4 LT |
459 | return -ENOBUFS; |
460 | ||
461 | return 0; | |
462 | } | |
463 | ||
a50feda5 | 464 | static bool ipv6_hdr_cmp(struct ipv6_opt_hdr *h1, struct ipv6_opt_hdr *h2) |
1da177e4 LT |
465 | { |
466 | if (h1 == h2) | |
a50feda5 | 467 | return false; |
1da177e4 | 468 | if (h1 == NULL || h2 == NULL) |
a50feda5 | 469 | return true; |
1da177e4 | 470 | if (h1->hdrlen != h2->hdrlen) |
a50feda5 | 471 | return true; |
1da177e4 LT |
472 | return memcmp(h1+1, h2+1, ((h1->hdrlen+1)<<3) - sizeof(*h1)); |
473 | } | |
474 | ||
a50feda5 | 475 | static bool ipv6_opt_cmp(struct ipv6_txoptions *o1, struct ipv6_txoptions *o2) |
1da177e4 LT |
476 | { |
477 | if (o1 == o2) | |
a50feda5 | 478 | return false; |
1da177e4 | 479 | if (o1 == NULL || o2 == NULL) |
a50feda5 | 480 | return true; |
1da177e4 | 481 | if (o1->opt_nflen != o2->opt_nflen) |
a50feda5 | 482 | return true; |
1da177e4 | 483 | if (ipv6_hdr_cmp(o1->hopopt, o2->hopopt)) |
a50feda5 | 484 | return true; |
1da177e4 | 485 | if (ipv6_hdr_cmp(o1->dst0opt, o2->dst0opt)) |
a50feda5 | 486 | return true; |
1da177e4 | 487 | if (ipv6_hdr_cmp((struct ipv6_opt_hdr *)o1->srcrt, (struct ipv6_opt_hdr *)o2->srcrt)) |
a50feda5 ED |
488 | return true; |
489 | return false; | |
1da177e4 LT |
490 | } |
491 | ||
04028045 PE |
492 | static inline void fl_link(struct ipv6_pinfo *np, struct ipv6_fl_socklist *sfl, |
493 | struct ip6_flowlabel *fl) | |
494 | { | |
18367681 | 495 | spin_lock_bh(&ip6_sk_fl_lock); |
04028045 PE |
496 | sfl->fl = fl; |
497 | sfl->next = np->ipv6_fl_list; | |
18367681 YH |
498 | rcu_assign_pointer(np->ipv6_fl_list, sfl); |
499 | spin_unlock_bh(&ip6_sk_fl_lock); | |
04028045 PE |
500 | } |
501 | ||
1da177e4 LT |
502 | int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen) |
503 | { | |
55205d40 | 504 | int uninitialized_var(err); |
60e8fbc4 | 505 | struct net *net = sock_net(sk); |
1da177e4 LT |
506 | struct ipv6_pinfo *np = inet6_sk(sk); |
507 | struct in6_flowlabel_req freq; | |
508 | struct ipv6_fl_socklist *sfl1=NULL; | |
509 | struct ipv6_fl_socklist *sfl, **sflp; | |
78c2e502 PE |
510 | struct ip6_flowlabel *fl, *fl1 = NULL; |
511 | ||
1da177e4 LT |
512 | |
513 | if (optlen < sizeof(freq)) | |
514 | return -EINVAL; | |
515 | ||
516 | if (copy_from_user(&freq, optval, sizeof(freq))) | |
517 | return -EFAULT; | |
518 | ||
519 | switch (freq.flr_action) { | |
520 | case IPV6_FL_A_PUT: | |
18367681 YH |
521 | spin_lock_bh(&ip6_sk_fl_lock); |
522 | for (sflp = &np->ipv6_fl_list; | |
523 | (sfl = rcu_dereference(*sflp))!=NULL; | |
524 | sflp = &sfl->next) { | |
1da177e4 LT |
525 | if (sfl->fl->label == freq.flr_label) { |
526 | if (freq.flr_label == (np->flow_label&IPV6_FLOWLABEL_MASK)) | |
527 | np->flow_label &= ~IPV6_FLOWLABEL_MASK; | |
18367681 YH |
528 | *sflp = rcu_dereference(sfl->next); |
529 | spin_unlock_bh(&ip6_sk_fl_lock); | |
1da177e4 | 530 | fl_release(sfl->fl); |
18367681 | 531 | kfree_rcu(sfl, rcu); |
1da177e4 LT |
532 | return 0; |
533 | } | |
534 | } | |
18367681 | 535 | spin_unlock_bh(&ip6_sk_fl_lock); |
1da177e4 LT |
536 | return -ESRCH; |
537 | ||
538 | case IPV6_FL_A_RENEW: | |
18367681 YH |
539 | rcu_read_lock_bh(); |
540 | for_each_sk_fl_rcu(np, sfl) { | |
1da177e4 LT |
541 | if (sfl->fl->label == freq.flr_label) { |
542 | err = fl6_renew(sfl->fl, freq.flr_linger, freq.flr_expires); | |
18367681 | 543 | rcu_read_unlock_bh(); |
1da177e4 LT |
544 | return err; |
545 | } | |
546 | } | |
18367681 | 547 | rcu_read_unlock_bh(); |
1da177e4 | 548 | |
af31f412 EB |
549 | if (freq.flr_share == IPV6_FL_S_NONE && |
550 | ns_capable(net->user_ns, CAP_NET_ADMIN)) { | |
60e8fbc4 | 551 | fl = fl_lookup(net, freq.flr_label); |
1da177e4 LT |
552 | if (fl) { |
553 | err = fl6_renew(fl, freq.flr_linger, freq.flr_expires); | |
554 | fl_release(fl); | |
555 | return err; | |
556 | } | |
557 | } | |
558 | return -ESRCH; | |
559 | ||
560 | case IPV6_FL_A_GET: | |
561 | if (freq.flr_label & ~IPV6_FLOWLABEL_MASK) | |
562 | return -EINVAL; | |
563 | ||
ec0506db | 564 | fl = fl_create(net, sk, &freq, optval, optlen, &err); |
1da177e4 LT |
565 | if (fl == NULL) |
566 | return err; | |
567 | sfl1 = kmalloc(sizeof(*sfl1), GFP_KERNEL); | |
568 | ||
569 | if (freq.flr_label) { | |
1da177e4 | 570 | err = -EEXIST; |
18367681 YH |
571 | rcu_read_lock_bh(); |
572 | for_each_sk_fl_rcu(np, sfl) { | |
1da177e4 LT |
573 | if (sfl->fl->label == freq.flr_label) { |
574 | if (freq.flr_flags&IPV6_FL_F_EXCL) { | |
18367681 | 575 | rcu_read_unlock_bh(); |
1da177e4 LT |
576 | goto done; |
577 | } | |
578 | fl1 = sfl->fl; | |
4ea6a804 | 579 | atomic_inc(&fl1->users); |
1da177e4 LT |
580 | break; |
581 | } | |
582 | } | |
18367681 | 583 | rcu_read_unlock_bh(); |
1da177e4 LT |
584 | |
585 | if (fl1 == NULL) | |
60e8fbc4 | 586 | fl1 = fl_lookup(net, freq.flr_label); |
1da177e4 | 587 | if (fl1) { |
78c2e502 | 588 | recheck: |
1da177e4 LT |
589 | err = -EEXIST; |
590 | if (freq.flr_flags&IPV6_FL_F_EXCL) | |
591 | goto release; | |
592 | err = -EPERM; | |
593 | if (fl1->share == IPV6_FL_S_EXCL || | |
594 | fl1->share != fl->share || | |
4f82f457 EB |
595 | ((fl1->share == IPV6_FL_S_PROCESS) && |
596 | (fl1->owner.pid == fl->owner.pid)) || | |
597 | ((fl1->share == IPV6_FL_S_USER) && | |
598 | uid_eq(fl1->owner.uid, fl->owner.uid))) | |
1da177e4 LT |
599 | goto release; |
600 | ||
601 | err = -EINVAL; | |
602 | if (!ipv6_addr_equal(&fl1->dst, &fl->dst) || | |
603 | ipv6_opt_cmp(fl1->opt, fl->opt)) | |
604 | goto release; | |
605 | ||
606 | err = -ENOMEM; | |
607 | if (sfl1 == NULL) | |
608 | goto release; | |
609 | if (fl->linger > fl1->linger) | |
610 | fl1->linger = fl->linger; | |
611 | if ((long)(fl->expires - fl1->expires) > 0) | |
612 | fl1->expires = fl->expires; | |
04028045 | 613 | fl_link(np, sfl1, fl1); |
1da177e4 LT |
614 | fl_free(fl); |
615 | return 0; | |
616 | ||
617 | release: | |
618 | fl_release(fl1); | |
619 | goto done; | |
620 | } | |
621 | } | |
622 | err = -ENOENT; | |
623 | if (!(freq.flr_flags&IPV6_FL_F_CREATE)) | |
624 | goto done; | |
625 | ||
626 | err = -ENOMEM; | |
627 | if (sfl1 == NULL || (err = mem_check(sk)) != 0) | |
628 | goto done; | |
629 | ||
60e8fbc4 | 630 | fl1 = fl_intern(net, fl, freq.flr_label); |
78c2e502 PE |
631 | if (fl1 != NULL) |
632 | goto recheck; | |
1da177e4 | 633 | |
6c94d361 DM |
634 | if (!freq.flr_label) { |
635 | if (copy_to_user(&((struct in6_flowlabel_req __user *) optval)->flr_label, | |
636 | &fl->label, sizeof(fl->label))) { | |
637 | /* Intentionally ignore fault. */ | |
638 | } | |
639 | } | |
1da177e4 | 640 | |
04028045 | 641 | fl_link(np, sfl1, fl); |
1da177e4 LT |
642 | return 0; |
643 | ||
644 | default: | |
645 | return -EINVAL; | |
646 | } | |
647 | ||
648 | done: | |
649 | fl_free(fl); | |
650 | kfree(sfl1); | |
651 | return err; | |
652 | } | |
653 | ||
654 | #ifdef CONFIG_PROC_FS | |
655 | ||
656 | struct ip6fl_iter_state { | |
5983a3df | 657 | struct seq_net_private p; |
4f82f457 | 658 | struct pid_namespace *pid_ns; |
1da177e4 LT |
659 | int bucket; |
660 | }; | |
661 | ||
662 | #define ip6fl_seq_private(seq) ((struct ip6fl_iter_state *)(seq)->private) | |
663 | ||
664 | static struct ip6_flowlabel *ip6fl_get_first(struct seq_file *seq) | |
665 | { | |
666 | struct ip6_flowlabel *fl = NULL; | |
667 | struct ip6fl_iter_state *state = ip6fl_seq_private(seq); | |
5983a3df | 668 | struct net *net = seq_file_net(seq); |
1da177e4 LT |
669 | |
670 | for (state->bucket = 0; state->bucket <= FL_HASH_MASK; ++state->bucket) { | |
d3aedd5e YH |
671 | for_each_fl_rcu(state->bucket, fl) { |
672 | if (net_eq(fl->fl_net, net)) | |
673 | goto out; | |
674 | } | |
1da177e4 | 675 | } |
d3aedd5e YH |
676 | fl = NULL; |
677 | out: | |
1da177e4 LT |
678 | return fl; |
679 | } | |
680 | ||
681 | static struct ip6_flowlabel *ip6fl_get_next(struct seq_file *seq, struct ip6_flowlabel *fl) | |
682 | { | |
683 | struct ip6fl_iter_state *state = ip6fl_seq_private(seq); | |
5983a3df | 684 | struct net *net = seq_file_net(seq); |
1da177e4 | 685 | |
d3aedd5e YH |
686 | for_each_fl_continue_rcu(fl) { |
687 | if (net_eq(fl->fl_net, net)) | |
688 | goto out; | |
689 | } | |
690 | ||
5983a3df | 691 | try_again: |
d3aedd5e YH |
692 | if (++state->bucket <= FL_HASH_MASK) { |
693 | for_each_fl_rcu(state->bucket, fl) { | |
694 | if (net_eq(fl->fl_net, net)) | |
695 | goto out; | |
696 | } | |
697 | goto try_again; | |
1da177e4 | 698 | } |
d3aedd5e YH |
699 | fl = NULL; |
700 | ||
701 | out: | |
1da177e4 LT |
702 | return fl; |
703 | } | |
704 | ||
705 | static struct ip6_flowlabel *ip6fl_get_idx(struct seq_file *seq, loff_t pos) | |
706 | { | |
707 | struct ip6_flowlabel *fl = ip6fl_get_first(seq); | |
708 | if (fl) | |
709 | while (pos && (fl = ip6fl_get_next(seq, fl)) != NULL) | |
710 | --pos; | |
711 | return pos ? NULL : fl; | |
712 | } | |
713 | ||
714 | static void *ip6fl_seq_start(struct seq_file *seq, loff_t *pos) | |
d3aedd5e | 715 | __acquires(RCU) |
1da177e4 | 716 | { |
d3aedd5e | 717 | rcu_read_lock_bh(); |
1da177e4 LT |
718 | return *pos ? ip6fl_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; |
719 | } | |
720 | ||
721 | static void *ip6fl_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
722 | { | |
723 | struct ip6_flowlabel *fl; | |
724 | ||
725 | if (v == SEQ_START_TOKEN) | |
726 | fl = ip6fl_get_first(seq); | |
727 | else | |
728 | fl = ip6fl_get_next(seq, v); | |
729 | ++*pos; | |
730 | return fl; | |
731 | } | |
732 | ||
733 | static void ip6fl_seq_stop(struct seq_file *seq, void *v) | |
d3aedd5e | 734 | __releases(RCU) |
1da177e4 | 735 | { |
d3aedd5e | 736 | rcu_read_unlock_bh(); |
1da177e4 LT |
737 | } |
738 | ||
1b7c2dbc | 739 | static int ip6fl_seq_show(struct seq_file *seq, void *v) |
1da177e4 | 740 | { |
4f82f457 | 741 | struct ip6fl_iter_state *state = ip6fl_seq_private(seq); |
1b7c2dbc JM |
742 | if (v == SEQ_START_TOKEN) |
743 | seq_printf(seq, "%-5s %-1s %-6s %-6s %-6s %-8s %-32s %s\n", | |
744 | "Label", "S", "Owner", "Users", "Linger", "Expires", "Dst", "Opt"); | |
745 | else { | |
746 | struct ip6_flowlabel *fl = v; | |
1da177e4 | 747 | seq_printf(seq, |
4b7a4274 | 748 | "%05X %-1d %-6d %-6d %-6ld %-8ld %pi6 %-4d\n", |
95c96174 | 749 | (unsigned int)ntohl(fl->label), |
1da177e4 | 750 | fl->share, |
4f82f457 EB |
751 | ((fl->share == IPV6_FL_S_PROCESS) ? |
752 | pid_nr_ns(fl->owner.pid, state->pid_ns) : | |
753 | ((fl->share == IPV6_FL_S_USER) ? | |
754 | from_kuid_munged(seq_user_ns(seq), fl->owner.uid) : | |
755 | 0)), | |
1da177e4 LT |
756 | atomic_read(&fl->users), |
757 | fl->linger/HZ, | |
758 | (long)(fl->expires - jiffies)/HZ, | |
b071195d | 759 | &fl->dst, |
1da177e4 | 760 | fl->opt ? fl->opt->opt_nflen : 0); |
1da177e4 | 761 | } |
1da177e4 LT |
762 | return 0; |
763 | } | |
764 | ||
56b3d975 | 765 | static const struct seq_operations ip6fl_seq_ops = { |
1da177e4 LT |
766 | .start = ip6fl_seq_start, |
767 | .next = ip6fl_seq_next, | |
768 | .stop = ip6fl_seq_stop, | |
769 | .show = ip6fl_seq_show, | |
770 | }; | |
771 | ||
772 | static int ip6fl_seq_open(struct inode *inode, struct file *file) | |
773 | { | |
4f82f457 EB |
774 | struct seq_file *seq; |
775 | struct ip6fl_iter_state *state; | |
776 | int err; | |
777 | ||
778 | err = seq_open_net(inode, file, &ip6fl_seq_ops, | |
779 | sizeof(struct ip6fl_iter_state)); | |
780 | ||
781 | if (!err) { | |
782 | seq = file->private_data; | |
783 | state = ip6fl_seq_private(seq); | |
784 | rcu_read_lock(); | |
785 | state->pid_ns = get_pid_ns(task_active_pid_ns(current)); | |
786 | rcu_read_unlock(); | |
787 | } | |
788 | return err; | |
789 | } | |
790 | ||
791 | static int ip6fl_seq_release(struct inode *inode, struct file *file) | |
792 | { | |
793 | struct seq_file *seq = file->private_data; | |
794 | struct ip6fl_iter_state *state = ip6fl_seq_private(seq); | |
795 | put_pid_ns(state->pid_ns); | |
796 | return seq_release_net(inode, file); | |
1da177e4 LT |
797 | } |
798 | ||
9a32144e | 799 | static const struct file_operations ip6fl_seq_fops = { |
1da177e4 LT |
800 | .owner = THIS_MODULE, |
801 | .open = ip6fl_seq_open, | |
802 | .read = seq_read, | |
803 | .llseek = seq_lseek, | |
4f82f457 | 804 | .release = ip6fl_seq_release, |
1da177e4 | 805 | }; |
1da177e4 | 806 | |
2c8c1e72 | 807 | static int __net_init ip6_flowlabel_proc_init(struct net *net) |
0a3e78ac | 808 | { |
d4beaa66 G |
809 | if (!proc_create("ip6_flowlabel", S_IRUGO, net->proc_net, |
810 | &ip6fl_seq_fops)) | |
0a3e78ac DL |
811 | return -ENOMEM; |
812 | return 0; | |
813 | } | |
1da177e4 | 814 | |
2c8c1e72 | 815 | static void __net_exit ip6_flowlabel_proc_fini(struct net *net) |
1da177e4 | 816 | { |
0a3e78ac DL |
817 | proc_net_remove(net, "ip6_flowlabel"); |
818 | } | |
819 | #else | |
820 | static inline int ip6_flowlabel_proc_init(struct net *net) | |
821 | { | |
822 | return 0; | |
823 | } | |
824 | static inline void ip6_flowlabel_proc_fini(struct net *net) | |
825 | { | |
0a3e78ac | 826 | } |
1da177e4 | 827 | #endif |
0a3e78ac | 828 | |
2c8c1e72 | 829 | static void __net_exit ip6_flowlabel_net_exit(struct net *net) |
60e8fbc4 BT |
830 | { |
831 | ip6_fl_purge(net); | |
5983a3df | 832 | ip6_flowlabel_proc_fini(net); |
60e8fbc4 BT |
833 | } |
834 | ||
835 | static struct pernet_operations ip6_flowlabel_net_ops = { | |
5983a3df | 836 | .init = ip6_flowlabel_proc_init, |
60e8fbc4 BT |
837 | .exit = ip6_flowlabel_net_exit, |
838 | }; | |
839 | ||
0a3e78ac DL |
840 | int ip6_flowlabel_init(void) |
841 | { | |
5983a3df | 842 | return register_pernet_subsys(&ip6_flowlabel_net_ops); |
1da177e4 LT |
843 | } |
844 | ||
845 | void ip6_flowlabel_cleanup(void) | |
846 | { | |
847 | del_timer(&ip6_fl_gc_timer); | |
60e8fbc4 | 848 | unregister_pernet_subsys(&ip6_flowlabel_net_ops); |
1da177e4 | 849 | } |