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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> | |
1da177e4 | 18 | #include <linux/in6.h> |
1da177e4 LT |
19 | #include <linux/proc_fs.h> |
20 | #include <linux/seq_file.h> | |
5a0e3ad6 | 21 | #include <linux/slab.h> |
bc3b2d7f | 22 | #include <linux/export.h> |
4f82f457 | 23 | #include <linux/pid_namespace.h> |
1da177e4 | 24 | |
457c4cbc | 25 | #include <net/net_namespace.h> |
1da177e4 LT |
26 | #include <net/sock.h> |
27 | ||
28 | #include <net/ipv6.h> | |
1da177e4 | 29 | #include <net/rawv6.h> |
1da177e4 LT |
30 | #include <net/transp_v6.h> |
31 | ||
7c0f6ba6 | 32 | #include <linux/uaccess.h> |
1da177e4 LT |
33 | |
34 | #define FL_MIN_LINGER 6 /* Minimal linger. It is set to 6sec specified | |
35 | in old IPv6 RFC. Well, it was reasonable value. | |
36 | */ | |
53b47106 | 37 | #define FL_MAX_LINGER 150 /* Maximal linger timeout */ |
1da177e4 LT |
38 | |
39 | /* FL hash table */ | |
40 | ||
41 | #define FL_MAX_PER_SOCK 32 | |
42 | #define FL_MAX_SIZE 4096 | |
43 | #define FL_HASH_MASK 255 | |
44 | #define FL_HASH(l) (ntohl(l)&FL_HASH_MASK) | |
45 | ||
46 | static atomic_t fl_size = ATOMIC_INIT(0); | |
d3aedd5e | 47 | static struct ip6_flowlabel __rcu *fl_ht[FL_HASH_MASK+1]; |
1da177e4 LT |
48 | |
49 | static void ip6_fl_gc(unsigned long dummy); | |
8d06afab | 50 | static DEFINE_TIMER(ip6_fl_gc_timer, ip6_fl_gc, 0, 0); |
1da177e4 LT |
51 | |
52 | /* FL hash table lock: it protects only of GC */ | |
53 | ||
d3aedd5e | 54 | static DEFINE_SPINLOCK(ip6_fl_lock); |
1da177e4 LT |
55 | |
56 | /* Big socket sock */ | |
57 | ||
18367681 | 58 | static DEFINE_SPINLOCK(ip6_sk_fl_lock); |
1da177e4 | 59 | |
d3aedd5e | 60 | #define for_each_fl_rcu(hash, fl) \ |
6a98dcf0 | 61 | for (fl = rcu_dereference_bh(fl_ht[(hash)]); \ |
d3aedd5e | 62 | fl != NULL; \ |
6a98dcf0 | 63 | fl = rcu_dereference_bh(fl->next)) |
d3aedd5e | 64 | #define for_each_fl_continue_rcu(fl) \ |
6a98dcf0 | 65 | for (fl = rcu_dereference_bh(fl->next); \ |
d3aedd5e | 66 | fl != NULL; \ |
6a98dcf0 | 67 | fl = rcu_dereference_bh(fl->next)) |
1da177e4 | 68 | |
18367681 YH |
69 | #define for_each_sk_fl_rcu(np, sfl) \ |
70 | for (sfl = rcu_dereference_bh(np->ipv6_fl_list); \ | |
71 | sfl != NULL; \ | |
72 | sfl = rcu_dereference_bh(sfl->next)) | |
73 | ||
60e8fbc4 | 74 | static inline struct ip6_flowlabel *__fl_lookup(struct net *net, __be32 label) |
1da177e4 LT |
75 | { |
76 | struct ip6_flowlabel *fl; | |
77 | ||
d3aedd5e | 78 | for_each_fl_rcu(FL_HASH(label), fl) { |
09ad9bc7 | 79 | if (fl->label == label && net_eq(fl->fl_net, net)) |
1da177e4 LT |
80 | return fl; |
81 | } | |
82 | return NULL; | |
83 | } | |
84 | ||
60e8fbc4 | 85 | static struct ip6_flowlabel *fl_lookup(struct net *net, __be32 label) |
1da177e4 LT |
86 | { |
87 | struct ip6_flowlabel *fl; | |
88 | ||
d3aedd5e | 89 | rcu_read_lock_bh(); |
60e8fbc4 | 90 | fl = __fl_lookup(net, label); |
d3aedd5e YH |
91 | if (fl && !atomic_inc_not_zero(&fl->users)) |
92 | fl = NULL; | |
93 | rcu_read_unlock_bh(); | |
1da177e4 LT |
94 | return fl; |
95 | } | |
96 | ||
97 | ||
98 | static void fl_free(struct ip6_flowlabel *fl) | |
99 | { | |
60e8fbc4 | 100 | if (fl) { |
898132ae DC |
101 | if (fl->share == IPV6_FL_S_PROCESS) |
102 | put_pid(fl->owner.pid); | |
1da177e4 | 103 | kfree(fl->opt); |
d3aedd5e | 104 | kfree_rcu(fl, rcu); |
60e8fbc4 | 105 | } |
1da177e4 LT |
106 | } |
107 | ||
108 | static void fl_release(struct ip6_flowlabel *fl) | |
109 | { | |
d3aedd5e | 110 | spin_lock_bh(&ip6_fl_lock); |
1da177e4 LT |
111 | |
112 | fl->lastuse = jiffies; | |
113 | if (atomic_dec_and_test(&fl->users)) { | |
114 | unsigned long ttd = fl->lastuse + fl->linger; | |
115 | if (time_after(ttd, fl->expires)) | |
116 | fl->expires = ttd; | |
117 | ttd = fl->expires; | |
118 | if (fl->opt && fl->share == IPV6_FL_S_EXCL) { | |
119 | struct ipv6_txoptions *opt = fl->opt; | |
120 | fl->opt = NULL; | |
121 | kfree(opt); | |
122 | } | |
123 | if (!timer_pending(&ip6_fl_gc_timer) || | |
124 | time_after(ip6_fl_gc_timer.expires, ttd)) | |
125 | mod_timer(&ip6_fl_gc_timer, ttd); | |
126 | } | |
d3aedd5e | 127 | spin_unlock_bh(&ip6_fl_lock); |
1da177e4 LT |
128 | } |
129 | ||
130 | static void ip6_fl_gc(unsigned long dummy) | |
131 | { | |
132 | int i; | |
133 | unsigned long now = jiffies; | |
134 | unsigned long sched = 0; | |
135 | ||
d3aedd5e | 136 | spin_lock(&ip6_fl_lock); |
1da177e4 | 137 | |
67ba4152 | 138 | for (i = 0; i <= FL_HASH_MASK; i++) { |
7f0e44ac ED |
139 | struct ip6_flowlabel *fl; |
140 | struct ip6_flowlabel __rcu **flp; | |
141 | ||
1da177e4 | 142 | flp = &fl_ht[i]; |
d3aedd5e YH |
143 | while ((fl = rcu_dereference_protected(*flp, |
144 | lockdep_is_held(&ip6_fl_lock))) != NULL) { | |
1da177e4 LT |
145 | if (atomic_read(&fl->users) == 0) { |
146 | unsigned long ttd = fl->lastuse + fl->linger; | |
147 | if (time_after(ttd, fl->expires)) | |
148 | fl->expires = ttd; | |
149 | ttd = fl->expires; | |
150 | if (time_after_eq(now, ttd)) { | |
151 | *flp = fl->next; | |
152 | fl_free(fl); | |
153 | atomic_dec(&fl_size); | |
154 | continue; | |
155 | } | |
156 | if (!sched || time_before(ttd, sched)) | |
157 | sched = ttd; | |
158 | } | |
159 | flp = &fl->next; | |
160 | } | |
161 | } | |
162 | if (!sched && atomic_read(&fl_size)) | |
163 | sched = now + FL_MAX_LINGER; | |
164 | if (sched) { | |
60e8fbc4 | 165 | mod_timer(&ip6_fl_gc_timer, sched); |
1da177e4 | 166 | } |
d3aedd5e | 167 | spin_unlock(&ip6_fl_lock); |
1da177e4 LT |
168 | } |
169 | ||
2c8c1e72 | 170 | static void __net_exit ip6_fl_purge(struct net *net) |
60e8fbc4 BT |
171 | { |
172 | int i; | |
173 | ||
4762fb98 | 174 | spin_lock_bh(&ip6_fl_lock); |
60e8fbc4 | 175 | for (i = 0; i <= FL_HASH_MASK; i++) { |
7f0e44ac ED |
176 | struct ip6_flowlabel *fl; |
177 | struct ip6_flowlabel __rcu **flp; | |
178 | ||
60e8fbc4 | 179 | flp = &fl_ht[i]; |
d3aedd5e YH |
180 | while ((fl = rcu_dereference_protected(*flp, |
181 | lockdep_is_held(&ip6_fl_lock))) != NULL) { | |
09ad9bc7 OP |
182 | if (net_eq(fl->fl_net, net) && |
183 | atomic_read(&fl->users) == 0) { | |
60e8fbc4 BT |
184 | *flp = fl->next; |
185 | fl_free(fl); | |
186 | atomic_dec(&fl_size); | |
187 | continue; | |
188 | } | |
189 | flp = &fl->next; | |
190 | } | |
191 | } | |
4762fb98 | 192 | spin_unlock_bh(&ip6_fl_lock); |
60e8fbc4 BT |
193 | } |
194 | ||
195 | static struct ip6_flowlabel *fl_intern(struct net *net, | |
196 | struct ip6_flowlabel *fl, __be32 label) | |
1da177e4 | 197 | { |
78c2e502 PE |
198 | struct ip6_flowlabel *lfl; |
199 | ||
1da177e4 LT |
200 | fl->label = label & IPV6_FLOWLABEL_MASK; |
201 | ||
d3aedd5e | 202 | spin_lock_bh(&ip6_fl_lock); |
1da177e4 LT |
203 | if (label == 0) { |
204 | for (;;) { | |
63862b5b | 205 | fl->label = htonl(prandom_u32())&IPV6_FLOWLABEL_MASK; |
1da177e4 | 206 | if (fl->label) { |
60e8fbc4 | 207 | lfl = __fl_lookup(net, fl->label); |
63159f29 | 208 | if (!lfl) |
1da177e4 LT |
209 | break; |
210 | } | |
211 | } | |
78c2e502 PE |
212 | } else { |
213 | /* | |
214 | * we dropper the ip6_fl_lock, so this entry could reappear | |
215 | * and we need to recheck with it. | |
216 | * | |
217 | * OTOH no need to search the active socket first, like it is | |
218 | * done in ipv6_flowlabel_opt - sock is locked, so new entry | |
219 | * with the same label can only appear on another sock | |
220 | */ | |
60e8fbc4 | 221 | lfl = __fl_lookup(net, fl->label); |
53b24b8f | 222 | if (lfl) { |
78c2e502 | 223 | atomic_inc(&lfl->users); |
d3aedd5e | 224 | spin_unlock_bh(&ip6_fl_lock); |
78c2e502 PE |
225 | return lfl; |
226 | } | |
1da177e4 LT |
227 | } |
228 | ||
229 | fl->lastuse = jiffies; | |
230 | fl->next = fl_ht[FL_HASH(fl->label)]; | |
d3aedd5e | 231 | rcu_assign_pointer(fl_ht[FL_HASH(fl->label)], fl); |
1da177e4 | 232 | atomic_inc(&fl_size); |
d3aedd5e | 233 | spin_unlock_bh(&ip6_fl_lock); |
78c2e502 | 234 | return NULL; |
1da177e4 LT |
235 | } |
236 | ||
237 | ||
238 | ||
239 | /* Socket flowlabel lists */ | |
240 | ||
67ba4152 | 241 | struct ip6_flowlabel *fl6_sock_lookup(struct sock *sk, __be32 label) |
1da177e4 LT |
242 | { |
243 | struct ipv6_fl_socklist *sfl; | |
244 | struct ipv6_pinfo *np = inet6_sk(sk); | |
245 | ||
246 | label &= IPV6_FLOWLABEL_MASK; | |
247 | ||
18367681 YH |
248 | rcu_read_lock_bh(); |
249 | for_each_sk_fl_rcu(np, sfl) { | |
1da177e4 LT |
250 | struct ip6_flowlabel *fl = sfl->fl; |
251 | if (fl->label == label) { | |
252 | fl->lastuse = jiffies; | |
253 | atomic_inc(&fl->users); | |
18367681 | 254 | rcu_read_unlock_bh(); |
1da177e4 LT |
255 | return fl; |
256 | } | |
257 | } | |
18367681 | 258 | rcu_read_unlock_bh(); |
1da177e4 LT |
259 | return NULL; |
260 | } | |
3cf3dc6c ACM |
261 | EXPORT_SYMBOL_GPL(fl6_sock_lookup); |
262 | ||
1da177e4 LT |
263 | void fl6_free_socklist(struct sock *sk) |
264 | { | |
265 | struct ipv6_pinfo *np = inet6_sk(sk); | |
266 | struct ipv6_fl_socklist *sfl; | |
267 | ||
18367681 | 268 | if (!rcu_access_pointer(np->ipv6_fl_list)) |
f256dc59 YH |
269 | return; |
270 | ||
18367681 YH |
271 | spin_lock_bh(&ip6_sk_fl_lock); |
272 | while ((sfl = rcu_dereference_protected(np->ipv6_fl_list, | |
273 | lockdep_is_held(&ip6_sk_fl_lock))) != NULL) { | |
274 | np->ipv6_fl_list = sfl->next; | |
275 | spin_unlock_bh(&ip6_sk_fl_lock); | |
f256dc59 | 276 | |
1da177e4 | 277 | fl_release(sfl->fl); |
18367681 YH |
278 | kfree_rcu(sfl, rcu); |
279 | ||
280 | spin_lock_bh(&ip6_sk_fl_lock); | |
1da177e4 | 281 | } |
18367681 | 282 | spin_unlock_bh(&ip6_sk_fl_lock); |
1da177e4 LT |
283 | } |
284 | ||
285 | /* Service routines */ | |
286 | ||
287 | ||
288 | /* | |
289 | It is the only difficult place. flowlabel enforces equal headers | |
290 | before and including routing header, however user may supply options | |
291 | following rthdr. | |
292 | */ | |
293 | ||
67ba4152 IM |
294 | struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions *opt_space, |
295 | struct ip6_flowlabel *fl, | |
296 | struct ipv6_txoptions *fopt) | |
1da177e4 | 297 | { |
67ba4152 | 298 | struct ipv6_txoptions *fl_opt = fl->opt; |
1ab1457c | 299 | |
63159f29 | 300 | if (!fopt || fopt->opt_flen == 0) |
df9890c3 | 301 | return fl_opt; |
1ab1457c | 302 | |
53b24b8f | 303 | if (fl_opt) { |
1da177e4 | 304 | opt_space->hopopt = fl_opt->hopopt; |
df9890c3 | 305 | opt_space->dst0opt = fl_opt->dst0opt; |
1da177e4 LT |
306 | opt_space->srcrt = fl_opt->srcrt; |
307 | opt_space->opt_nflen = fl_opt->opt_nflen; | |
308 | } else { | |
309 | if (fopt->opt_nflen == 0) | |
310 | return fopt; | |
311 | opt_space->hopopt = NULL; | |
312 | opt_space->dst0opt = NULL; | |
313 | opt_space->srcrt = NULL; | |
314 | opt_space->opt_nflen = 0; | |
315 | } | |
316 | opt_space->dst1opt = fopt->dst1opt; | |
1da177e4 | 317 | opt_space->opt_flen = fopt->opt_flen; |
864e2a1f | 318 | opt_space->tot_len = fopt->tot_len; |
1da177e4 LT |
319 | return opt_space; |
320 | } | |
a495f836 | 321 | EXPORT_SYMBOL_GPL(fl6_merge_options); |
1da177e4 LT |
322 | |
323 | static unsigned long check_linger(unsigned long ttl) | |
324 | { | |
325 | if (ttl < FL_MIN_LINGER) | |
326 | return FL_MIN_LINGER*HZ; | |
327 | if (ttl > FL_MAX_LINGER && !capable(CAP_NET_ADMIN)) | |
328 | return 0; | |
329 | return ttl*HZ; | |
330 | } | |
331 | ||
332 | static int fl6_renew(struct ip6_flowlabel *fl, unsigned long linger, unsigned long expires) | |
333 | { | |
334 | linger = check_linger(linger); | |
335 | if (!linger) | |
336 | return -EPERM; | |
337 | expires = check_linger(expires); | |
338 | if (!expires) | |
339 | return -EPERM; | |
394055f6 FF |
340 | |
341 | spin_lock_bh(&ip6_fl_lock); | |
1da177e4 LT |
342 | fl->lastuse = jiffies; |
343 | if (time_before(fl->linger, linger)) | |
344 | fl->linger = linger; | |
345 | if (time_before(expires, fl->linger)) | |
346 | expires = fl->linger; | |
347 | if (time_before(fl->expires, fl->lastuse + expires)) | |
348 | fl->expires = fl->lastuse + expires; | |
394055f6 FF |
349 | spin_unlock_bh(&ip6_fl_lock); |
350 | ||
1da177e4 LT |
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); |
63159f29 | 370 | if (!fl) |
1da177e4 | 371 | goto done; |
1da177e4 | 372 | |
1da177e4 LT |
373 | if (olen > 0) { |
374 | struct msghdr msg; | |
4c9483b2 | 375 | struct flowi6 flowi6; |
ad1e46a8 | 376 | struct sockcm_cookie sockc_junk; |
26879da5 | 377 | struct ipcm6_cookie ipc6; |
1da177e4 LT |
378 | |
379 | err = -ENOMEM; | |
380 | fl->opt = kmalloc(sizeof(*fl->opt) + olen, GFP_KERNEL); | |
63159f29 | 381 | if (!fl->opt) |
1da177e4 LT |
382 | goto done; |
383 | ||
384 | memset(fl->opt, 0, sizeof(*fl->opt)); | |
385 | fl->opt->tot_len = sizeof(*fl->opt) + olen; | |
386 | err = -EFAULT; | |
387 | if (copy_from_user(fl->opt+1, optval+CMSG_ALIGN(sizeof(*freq)), olen)) | |
388 | goto done; | |
389 | ||
390 | msg.msg_controllen = olen; | |
67ba4152 | 391 | msg.msg_control = (void *)(fl->opt+1); |
4c9483b2 | 392 | memset(&flowi6, 0, sizeof(flowi6)); |
1da177e4 | 393 | |
26879da5 WW |
394 | ipc6.opt = fl->opt; |
395 | err = ip6_datagram_send_ctl(net, sk, &msg, &flowi6, &ipc6, &sockc_junk); | |
1da177e4 LT |
396 | if (err) |
397 | goto done; | |
398 | err = -EINVAL; | |
399 | if (fl->opt->opt_flen) | |
400 | goto done; | |
401 | if (fl->opt->opt_nflen == 0) { | |
402 | kfree(fl->opt); | |
403 | fl->opt = NULL; | |
404 | } | |
405 | } | |
406 | ||
efd7ef1c | 407 | fl->fl_net = net; |
1da177e4 LT |
408 | fl->expires = jiffies; |
409 | err = fl6_renew(fl, freq->flr_linger, freq->flr_expires); | |
410 | if (err) | |
411 | goto done; | |
412 | fl->share = freq->flr_share; | |
413 | addr_type = ipv6_addr_type(&freq->flr_dst); | |
35700212 JP |
414 | if ((addr_type & IPV6_ADDR_MAPPED) || |
415 | addr_type == IPV6_ADDR_ANY) { | |
c6817e4c | 416 | err = -EINVAL; |
1da177e4 | 417 | goto done; |
c6817e4c | 418 | } |
4e3fd7a0 | 419 | fl->dst = freq->flr_dst; |
1da177e4 LT |
420 | atomic_set(&fl->users, 1); |
421 | switch (fl->share) { | |
422 | case IPV6_FL_S_EXCL: | |
423 | case IPV6_FL_S_ANY: | |
424 | break; | |
425 | case IPV6_FL_S_PROCESS: | |
4f82f457 | 426 | fl->owner.pid = get_task_pid(current, PIDTYPE_PID); |
1da177e4 LT |
427 | break; |
428 | case IPV6_FL_S_USER: | |
4f82f457 | 429 | fl->owner.uid = current_euid(); |
1da177e4 LT |
430 | break; |
431 | default: | |
432 | err = -EINVAL; | |
433 | goto done; | |
434 | } | |
435 | return fl; | |
436 | ||
437 | done: | |
438 | fl_free(fl); | |
439 | *err_p = err; | |
440 | return NULL; | |
441 | } | |
442 | ||
443 | static int mem_check(struct sock *sk) | |
444 | { | |
445 | struct ipv6_pinfo *np = inet6_sk(sk); | |
446 | struct ipv6_fl_socklist *sfl; | |
447 | int room = FL_MAX_SIZE - atomic_read(&fl_size); | |
448 | int count = 0; | |
449 | ||
450 | if (room > FL_MAX_SIZE - FL_MAX_PER_SOCK) | |
451 | return 0; | |
452 | ||
f8c31c8f | 453 | rcu_read_lock_bh(); |
18367681 | 454 | for_each_sk_fl_rcu(np, sfl) |
1da177e4 | 455 | count++; |
f8c31c8f | 456 | rcu_read_unlock_bh(); |
1da177e4 LT |
457 | |
458 | if (room <= 0 || | |
459 | ((count >= FL_MAX_PER_SOCK || | |
35700212 JP |
460 | (count > 0 && room < FL_MAX_SIZE/2) || room < FL_MAX_SIZE/4) && |
461 | !capable(CAP_NET_ADMIN))) | |
1da177e4 LT |
462 | return -ENOBUFS; |
463 | ||
464 | return 0; | |
465 | } | |
466 | ||
04028045 PE |
467 | static inline void fl_link(struct ipv6_pinfo *np, struct ipv6_fl_socklist *sfl, |
468 | struct ip6_flowlabel *fl) | |
469 | { | |
18367681 | 470 | spin_lock_bh(&ip6_sk_fl_lock); |
04028045 PE |
471 | sfl->fl = fl; |
472 | sfl->next = np->ipv6_fl_list; | |
18367681 YH |
473 | rcu_assign_pointer(np->ipv6_fl_list, sfl); |
474 | spin_unlock_bh(&ip6_sk_fl_lock); | |
04028045 PE |
475 | } |
476 | ||
46e5f401 FF |
477 | int ipv6_flowlabel_opt_get(struct sock *sk, struct in6_flowlabel_req *freq, |
478 | int flags) | |
3fdfa5ff FF |
479 | { |
480 | struct ipv6_pinfo *np = inet6_sk(sk); | |
481 | struct ipv6_fl_socklist *sfl; | |
482 | ||
46e5f401 FF |
483 | if (flags & IPV6_FL_F_REMOTE) { |
484 | freq->flr_label = np->rcv_flowinfo & IPV6_FLOWLABEL_MASK; | |
485 | return 0; | |
486 | } | |
487 | ||
df3687ff FF |
488 | if (np->repflow) { |
489 | freq->flr_label = np->flow_label; | |
490 | return 0; | |
491 | } | |
492 | ||
3fdfa5ff FF |
493 | rcu_read_lock_bh(); |
494 | ||
495 | for_each_sk_fl_rcu(np, sfl) { | |
496 | if (sfl->fl->label == (np->flow_label & IPV6_FLOWLABEL_MASK)) { | |
497 | spin_lock_bh(&ip6_fl_lock); | |
498 | freq->flr_label = sfl->fl->label; | |
499 | freq->flr_dst = sfl->fl->dst; | |
500 | freq->flr_share = sfl->fl->share; | |
501 | freq->flr_expires = (sfl->fl->expires - jiffies) / HZ; | |
502 | freq->flr_linger = sfl->fl->linger / HZ; | |
503 | ||
504 | spin_unlock_bh(&ip6_fl_lock); | |
505 | rcu_read_unlock_bh(); | |
506 | return 0; | |
507 | } | |
508 | } | |
509 | rcu_read_unlock_bh(); | |
510 | ||
511 | return -ENOENT; | |
512 | } | |
513 | ||
1da177e4 LT |
514 | int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen) |
515 | { | |
55205d40 | 516 | int uninitialized_var(err); |
60e8fbc4 | 517 | struct net *net = sock_net(sk); |
1da177e4 LT |
518 | struct ipv6_pinfo *np = inet6_sk(sk); |
519 | struct in6_flowlabel_req freq; | |
67ba4152 | 520 | struct ipv6_fl_socklist *sfl1 = NULL; |
7f0e44ac ED |
521 | struct ipv6_fl_socklist *sfl; |
522 | struct ipv6_fl_socklist __rcu **sflp; | |
78c2e502 PE |
523 | struct ip6_flowlabel *fl, *fl1 = NULL; |
524 | ||
1da177e4 LT |
525 | |
526 | if (optlen < sizeof(freq)) | |
527 | return -EINVAL; | |
528 | ||
529 | if (copy_from_user(&freq, optval, sizeof(freq))) | |
530 | return -EFAULT; | |
531 | ||
532 | switch (freq.flr_action) { | |
533 | case IPV6_FL_A_PUT: | |
df3687ff FF |
534 | if (freq.flr_flags & IPV6_FL_F_REFLECT) { |
535 | if (sk->sk_protocol != IPPROTO_TCP) | |
536 | return -ENOPROTOOPT; | |
537 | if (!np->repflow) | |
538 | return -ESRCH; | |
539 | np->flow_label = 0; | |
540 | np->repflow = 0; | |
541 | return 0; | |
542 | } | |
18367681 YH |
543 | spin_lock_bh(&ip6_sk_fl_lock); |
544 | for (sflp = &np->ipv6_fl_list; | |
44c3d0c1 ED |
545 | (sfl = rcu_dereference_protected(*sflp, |
546 | lockdep_is_held(&ip6_sk_fl_lock))) != NULL; | |
18367681 | 547 | sflp = &sfl->next) { |
1da177e4 LT |
548 | if (sfl->fl->label == freq.flr_label) { |
549 | if (freq.flr_label == (np->flow_label&IPV6_FLOWLABEL_MASK)) | |
550 | np->flow_label &= ~IPV6_FLOWLABEL_MASK; | |
44c3d0c1 | 551 | *sflp = sfl->next; |
18367681 | 552 | spin_unlock_bh(&ip6_sk_fl_lock); |
1da177e4 | 553 | fl_release(sfl->fl); |
18367681 | 554 | kfree_rcu(sfl, rcu); |
1da177e4 LT |
555 | return 0; |
556 | } | |
557 | } | |
18367681 | 558 | spin_unlock_bh(&ip6_sk_fl_lock); |
1da177e4 LT |
559 | return -ESRCH; |
560 | ||
561 | case IPV6_FL_A_RENEW: | |
18367681 YH |
562 | rcu_read_lock_bh(); |
563 | for_each_sk_fl_rcu(np, sfl) { | |
1da177e4 LT |
564 | if (sfl->fl->label == freq.flr_label) { |
565 | err = fl6_renew(sfl->fl, freq.flr_linger, freq.flr_expires); | |
18367681 | 566 | rcu_read_unlock_bh(); |
1da177e4 LT |
567 | return err; |
568 | } | |
569 | } | |
18367681 | 570 | rcu_read_unlock_bh(); |
1da177e4 | 571 | |
af31f412 EB |
572 | if (freq.flr_share == IPV6_FL_S_NONE && |
573 | ns_capable(net->user_ns, CAP_NET_ADMIN)) { | |
60e8fbc4 | 574 | fl = fl_lookup(net, freq.flr_label); |
1da177e4 LT |
575 | if (fl) { |
576 | err = fl6_renew(fl, freq.flr_linger, freq.flr_expires); | |
577 | fl_release(fl); | |
578 | return err; | |
579 | } | |
580 | } | |
581 | return -ESRCH; | |
582 | ||
583 | case IPV6_FL_A_GET: | |
df3687ff | 584 | if (freq.flr_flags & IPV6_FL_F_REFLECT) { |
6444f72b FF |
585 | struct net *net = sock_net(sk); |
586 | if (net->ipv6.sysctl.flowlabel_consistency) { | |
587 | net_info_ratelimited("Can not set IPV6_FL_F_REFLECT if flowlabel_consistency sysctl is enable\n"); | |
588 | return -EPERM; | |
589 | } | |
590 | ||
df3687ff FF |
591 | if (sk->sk_protocol != IPPROTO_TCP) |
592 | return -ENOPROTOOPT; | |
6444f72b | 593 | |
df3687ff FF |
594 | np->repflow = 1; |
595 | return 0; | |
596 | } | |
597 | ||
1da177e4 LT |
598 | if (freq.flr_label & ~IPV6_FLOWLABEL_MASK) |
599 | return -EINVAL; | |
600 | ||
82a584b7 TH |
601 | if (net->ipv6.sysctl.flowlabel_state_ranges && |
602 | (freq.flr_label & IPV6_FLOWLABEL_STATELESS_FLAG)) | |
603 | return -ERANGE; | |
604 | ||
ec0506db | 605 | fl = fl_create(net, sk, &freq, optval, optlen, &err); |
63159f29 | 606 | if (!fl) |
1da177e4 LT |
607 | return err; |
608 | sfl1 = kmalloc(sizeof(*sfl1), GFP_KERNEL); | |
609 | ||
610 | if (freq.flr_label) { | |
1da177e4 | 611 | err = -EEXIST; |
18367681 YH |
612 | rcu_read_lock_bh(); |
613 | for_each_sk_fl_rcu(np, sfl) { | |
1da177e4 LT |
614 | if (sfl->fl->label == freq.flr_label) { |
615 | if (freq.flr_flags&IPV6_FL_F_EXCL) { | |
18367681 | 616 | rcu_read_unlock_bh(); |
1da177e4 LT |
617 | goto done; |
618 | } | |
619 | fl1 = sfl->fl; | |
4ea6a804 | 620 | atomic_inc(&fl1->users); |
1da177e4 LT |
621 | break; |
622 | } | |
623 | } | |
18367681 | 624 | rcu_read_unlock_bh(); |
1da177e4 | 625 | |
63159f29 | 626 | if (!fl1) |
60e8fbc4 | 627 | fl1 = fl_lookup(net, freq.flr_label); |
1da177e4 | 628 | if (fl1) { |
78c2e502 | 629 | recheck: |
1da177e4 LT |
630 | err = -EEXIST; |
631 | if (freq.flr_flags&IPV6_FL_F_EXCL) | |
632 | goto release; | |
633 | err = -EPERM; | |
634 | if (fl1->share == IPV6_FL_S_EXCL || | |
635 | fl1->share != fl->share || | |
4f82f457 EB |
636 | ((fl1->share == IPV6_FL_S_PROCESS) && |
637 | (fl1->owner.pid == fl->owner.pid)) || | |
638 | ((fl1->share == IPV6_FL_S_USER) && | |
639 | uid_eq(fl1->owner.uid, fl->owner.uid))) | |
1da177e4 LT |
640 | goto release; |
641 | ||
1da177e4 | 642 | err = -ENOMEM; |
63159f29 | 643 | if (!sfl1) |
1da177e4 LT |
644 | goto release; |
645 | if (fl->linger > fl1->linger) | |
646 | fl1->linger = fl->linger; | |
647 | if ((long)(fl->expires - fl1->expires) > 0) | |
648 | fl1->expires = fl->expires; | |
04028045 | 649 | fl_link(np, sfl1, fl1); |
1da177e4 LT |
650 | fl_free(fl); |
651 | return 0; | |
652 | ||
653 | release: | |
654 | fl_release(fl1); | |
655 | goto done; | |
656 | } | |
657 | } | |
658 | err = -ENOENT; | |
659 | if (!(freq.flr_flags&IPV6_FL_F_CREATE)) | |
660 | goto done; | |
661 | ||
662 | err = -ENOMEM; | |
63159f29 | 663 | if (!sfl1) |
e5d08d71 IM |
664 | goto done; |
665 | ||
666 | err = mem_check(sk); | |
667 | if (err != 0) | |
1da177e4 LT |
668 | goto done; |
669 | ||
60e8fbc4 | 670 | fl1 = fl_intern(net, fl, freq.flr_label); |
53b24b8f | 671 | if (fl1) |
78c2e502 | 672 | goto recheck; |
1da177e4 | 673 | |
6c94d361 DM |
674 | if (!freq.flr_label) { |
675 | if (copy_to_user(&((struct in6_flowlabel_req __user *) optval)->flr_label, | |
676 | &fl->label, sizeof(fl->label))) { | |
677 | /* Intentionally ignore fault. */ | |
678 | } | |
679 | } | |
1da177e4 | 680 | |
04028045 | 681 | fl_link(np, sfl1, fl); |
1da177e4 LT |
682 | return 0; |
683 | ||
684 | default: | |
685 | return -EINVAL; | |
686 | } | |
687 | ||
688 | done: | |
689 | fl_free(fl); | |
690 | kfree(sfl1); | |
691 | return err; | |
692 | } | |
693 | ||
694 | #ifdef CONFIG_PROC_FS | |
695 | ||
696 | struct ip6fl_iter_state { | |
5983a3df | 697 | struct seq_net_private p; |
4f82f457 | 698 | struct pid_namespace *pid_ns; |
1da177e4 LT |
699 | int bucket; |
700 | }; | |
701 | ||
702 | #define ip6fl_seq_private(seq) ((struct ip6fl_iter_state *)(seq)->private) | |
703 | ||
704 | static struct ip6_flowlabel *ip6fl_get_first(struct seq_file *seq) | |
705 | { | |
706 | struct ip6_flowlabel *fl = NULL; | |
707 | struct ip6fl_iter_state *state = ip6fl_seq_private(seq); | |
5983a3df | 708 | struct net *net = seq_file_net(seq); |
1da177e4 LT |
709 | |
710 | for (state->bucket = 0; state->bucket <= FL_HASH_MASK; ++state->bucket) { | |
d3aedd5e YH |
711 | for_each_fl_rcu(state->bucket, fl) { |
712 | if (net_eq(fl->fl_net, net)) | |
713 | goto out; | |
714 | } | |
1da177e4 | 715 | } |
d3aedd5e YH |
716 | fl = NULL; |
717 | out: | |
1da177e4 LT |
718 | return fl; |
719 | } | |
720 | ||
721 | static struct ip6_flowlabel *ip6fl_get_next(struct seq_file *seq, struct ip6_flowlabel *fl) | |
722 | { | |
723 | struct ip6fl_iter_state *state = ip6fl_seq_private(seq); | |
5983a3df | 724 | struct net *net = seq_file_net(seq); |
1da177e4 | 725 | |
d3aedd5e YH |
726 | for_each_fl_continue_rcu(fl) { |
727 | if (net_eq(fl->fl_net, net)) | |
728 | goto out; | |
729 | } | |
730 | ||
5983a3df | 731 | try_again: |
d3aedd5e YH |
732 | if (++state->bucket <= FL_HASH_MASK) { |
733 | for_each_fl_rcu(state->bucket, fl) { | |
734 | if (net_eq(fl->fl_net, net)) | |
735 | goto out; | |
736 | } | |
737 | goto try_again; | |
1da177e4 | 738 | } |
d3aedd5e YH |
739 | fl = NULL; |
740 | ||
741 | out: | |
1da177e4 LT |
742 | return fl; |
743 | } | |
744 | ||
745 | static struct ip6_flowlabel *ip6fl_get_idx(struct seq_file *seq, loff_t pos) | |
746 | { | |
747 | struct ip6_flowlabel *fl = ip6fl_get_first(seq); | |
748 | if (fl) | |
749 | while (pos && (fl = ip6fl_get_next(seq, fl)) != NULL) | |
750 | --pos; | |
751 | return pos ? NULL : fl; | |
752 | } | |
753 | ||
754 | static void *ip6fl_seq_start(struct seq_file *seq, loff_t *pos) | |
d3aedd5e | 755 | __acquires(RCU) |
1da177e4 | 756 | { |
d3aedd5e | 757 | rcu_read_lock_bh(); |
1da177e4 LT |
758 | return *pos ? ip6fl_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; |
759 | } | |
760 | ||
761 | static void *ip6fl_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
762 | { | |
763 | struct ip6_flowlabel *fl; | |
764 | ||
765 | if (v == SEQ_START_TOKEN) | |
766 | fl = ip6fl_get_first(seq); | |
767 | else | |
768 | fl = ip6fl_get_next(seq, v); | |
769 | ++*pos; | |
770 | return fl; | |
771 | } | |
772 | ||
773 | static void ip6fl_seq_stop(struct seq_file *seq, void *v) | |
d3aedd5e | 774 | __releases(RCU) |
1da177e4 | 775 | { |
d3aedd5e | 776 | rcu_read_unlock_bh(); |
1da177e4 LT |
777 | } |
778 | ||
1b7c2dbc | 779 | static int ip6fl_seq_show(struct seq_file *seq, void *v) |
1da177e4 | 780 | { |
4f82f457 | 781 | struct ip6fl_iter_state *state = ip6fl_seq_private(seq); |
869ba988 | 782 | if (v == SEQ_START_TOKEN) { |
1744bea1 | 783 | seq_puts(seq, "Label S Owner Users Linger Expires Dst Opt\n"); |
869ba988 | 784 | } else { |
1b7c2dbc | 785 | struct ip6_flowlabel *fl = v; |
1da177e4 | 786 | seq_printf(seq, |
4b7a4274 | 787 | "%05X %-1d %-6d %-6d %-6ld %-8ld %pi6 %-4d\n", |
95c96174 | 788 | (unsigned int)ntohl(fl->label), |
1da177e4 | 789 | fl->share, |
4f82f457 EB |
790 | ((fl->share == IPV6_FL_S_PROCESS) ? |
791 | pid_nr_ns(fl->owner.pid, state->pid_ns) : | |
792 | ((fl->share == IPV6_FL_S_USER) ? | |
793 | from_kuid_munged(seq_user_ns(seq), fl->owner.uid) : | |
794 | 0)), | |
1da177e4 LT |
795 | atomic_read(&fl->users), |
796 | fl->linger/HZ, | |
797 | (long)(fl->expires - jiffies)/HZ, | |
b071195d | 798 | &fl->dst, |
1da177e4 | 799 | fl->opt ? fl->opt->opt_nflen : 0); |
1da177e4 | 800 | } |
1da177e4 LT |
801 | return 0; |
802 | } | |
803 | ||
56b3d975 | 804 | static const struct seq_operations ip6fl_seq_ops = { |
1da177e4 LT |
805 | .start = ip6fl_seq_start, |
806 | .next = ip6fl_seq_next, | |
807 | .stop = ip6fl_seq_stop, | |
808 | .show = ip6fl_seq_show, | |
809 | }; | |
810 | ||
811 | static int ip6fl_seq_open(struct inode *inode, struct file *file) | |
812 | { | |
4f82f457 EB |
813 | struct seq_file *seq; |
814 | struct ip6fl_iter_state *state; | |
815 | int err; | |
816 | ||
817 | err = seq_open_net(inode, file, &ip6fl_seq_ops, | |
818 | sizeof(struct ip6fl_iter_state)); | |
819 | ||
820 | if (!err) { | |
821 | seq = file->private_data; | |
822 | state = ip6fl_seq_private(seq); | |
823 | rcu_read_lock(); | |
824 | state->pid_ns = get_pid_ns(task_active_pid_ns(current)); | |
825 | rcu_read_unlock(); | |
826 | } | |
827 | return err; | |
828 | } | |
829 | ||
830 | static int ip6fl_seq_release(struct inode *inode, struct file *file) | |
831 | { | |
832 | struct seq_file *seq = file->private_data; | |
833 | struct ip6fl_iter_state *state = ip6fl_seq_private(seq); | |
834 | put_pid_ns(state->pid_ns); | |
835 | return seq_release_net(inode, file); | |
1da177e4 LT |
836 | } |
837 | ||
9a32144e | 838 | static const struct file_operations ip6fl_seq_fops = { |
1da177e4 LT |
839 | .owner = THIS_MODULE, |
840 | .open = ip6fl_seq_open, | |
841 | .read = seq_read, | |
842 | .llseek = seq_lseek, | |
4f82f457 | 843 | .release = ip6fl_seq_release, |
1da177e4 | 844 | }; |
1da177e4 | 845 | |
2c8c1e72 | 846 | static int __net_init ip6_flowlabel_proc_init(struct net *net) |
0a3e78ac | 847 | { |
d4beaa66 G |
848 | if (!proc_create("ip6_flowlabel", S_IRUGO, net->proc_net, |
849 | &ip6fl_seq_fops)) | |
0a3e78ac DL |
850 | return -ENOMEM; |
851 | return 0; | |
852 | } | |
1da177e4 | 853 | |
2c8c1e72 | 854 | static void __net_exit ip6_flowlabel_proc_fini(struct net *net) |
1da177e4 | 855 | { |
ece31ffd | 856 | remove_proc_entry("ip6_flowlabel", net->proc_net); |
0a3e78ac DL |
857 | } |
858 | #else | |
859 | static inline int ip6_flowlabel_proc_init(struct net *net) | |
860 | { | |
861 | return 0; | |
862 | } | |
863 | static inline void ip6_flowlabel_proc_fini(struct net *net) | |
864 | { | |
0a3e78ac | 865 | } |
1da177e4 | 866 | #endif |
0a3e78ac | 867 | |
2c8c1e72 | 868 | static void __net_exit ip6_flowlabel_net_exit(struct net *net) |
60e8fbc4 BT |
869 | { |
870 | ip6_fl_purge(net); | |
5983a3df | 871 | ip6_flowlabel_proc_fini(net); |
60e8fbc4 BT |
872 | } |
873 | ||
874 | static struct pernet_operations ip6_flowlabel_net_ops = { | |
5983a3df | 875 | .init = ip6_flowlabel_proc_init, |
60e8fbc4 BT |
876 | .exit = ip6_flowlabel_net_exit, |
877 | }; | |
878 | ||
0a3e78ac DL |
879 | int ip6_flowlabel_init(void) |
880 | { | |
5983a3df | 881 | return register_pernet_subsys(&ip6_flowlabel_net_ops); |
1da177e4 LT |
882 | } |
883 | ||
884 | void ip6_flowlabel_cleanup(void) | |
885 | { | |
886 | del_timer(&ip6_fl_gc_timer); | |
60e8fbc4 | 887 | unregister_pernet_subsys(&ip6_flowlabel_net_ops); |
1da177e4 | 888 | } |