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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> | |
23 | ||
457c4cbc | 24 | #include <net/net_namespace.h> |
1da177e4 LT |
25 | #include <net/sock.h> |
26 | ||
27 | #include <net/ipv6.h> | |
28 | #include <net/ndisc.h> | |
29 | #include <net/protocol.h> | |
30 | #include <net/ip6_route.h> | |
31 | #include <net/addrconf.h> | |
32 | #include <net/rawv6.h> | |
33 | #include <net/icmp.h> | |
34 | #include <net/transp_v6.h> | |
35 | ||
36 | #include <asm/uaccess.h> | |
37 | ||
38 | #define FL_MIN_LINGER 6 /* Minimal linger. It is set to 6sec specified | |
39 | in old IPv6 RFC. Well, it was reasonable value. | |
40 | */ | |
41 | #define FL_MAX_LINGER 60 /* Maximal linger timeout */ | |
42 | ||
43 | /* FL hash table */ | |
44 | ||
45 | #define FL_MAX_PER_SOCK 32 | |
46 | #define FL_MAX_SIZE 4096 | |
47 | #define FL_HASH_MASK 255 | |
48 | #define FL_HASH(l) (ntohl(l)&FL_HASH_MASK) | |
49 | ||
50 | static atomic_t fl_size = ATOMIC_INIT(0); | |
51 | static struct ip6_flowlabel *fl_ht[FL_HASH_MASK+1]; | |
52 | ||
53 | static void ip6_fl_gc(unsigned long dummy); | |
8d06afab | 54 | static DEFINE_TIMER(ip6_fl_gc_timer, ip6_fl_gc, 0, 0); |
1da177e4 LT |
55 | |
56 | /* FL hash table lock: it protects only of GC */ | |
57 | ||
58 | static DEFINE_RWLOCK(ip6_fl_lock); | |
59 | ||
60 | /* Big socket sock */ | |
61 | ||
62 | static DEFINE_RWLOCK(ip6_sk_fl_lock); | |
63 | ||
64 | ||
90bcaf7b | 65 | static __inline__ struct ip6_flowlabel * __fl_lookup(__be32 label) |
1da177e4 LT |
66 | { |
67 | struct ip6_flowlabel *fl; | |
68 | ||
69 | for (fl=fl_ht[FL_HASH(label)]; fl; fl = fl->next) { | |
70 | if (fl->label == label) | |
71 | return fl; | |
72 | } | |
73 | return NULL; | |
74 | } | |
75 | ||
90bcaf7b | 76 | static struct ip6_flowlabel * fl_lookup(__be32 label) |
1da177e4 LT |
77 | { |
78 | struct ip6_flowlabel *fl; | |
79 | ||
80 | read_lock_bh(&ip6_fl_lock); | |
81 | fl = __fl_lookup(label); | |
82 | if (fl) | |
83 | atomic_inc(&fl->users); | |
84 | read_unlock_bh(&ip6_fl_lock); | |
85 | return fl; | |
86 | } | |
87 | ||
88 | ||
89 | static void fl_free(struct ip6_flowlabel *fl) | |
90 | { | |
91 | if (fl) | |
92 | kfree(fl->opt); | |
93 | kfree(fl); | |
94 | } | |
95 | ||
96 | static void fl_release(struct ip6_flowlabel *fl) | |
97 | { | |
98 | write_lock_bh(&ip6_fl_lock); | |
99 | ||
100 | fl->lastuse = jiffies; | |
101 | if (atomic_dec_and_test(&fl->users)) { | |
102 | unsigned long ttd = fl->lastuse + fl->linger; | |
103 | if (time_after(ttd, fl->expires)) | |
104 | fl->expires = ttd; | |
105 | ttd = fl->expires; | |
106 | if (fl->opt && fl->share == IPV6_FL_S_EXCL) { | |
107 | struct ipv6_txoptions *opt = fl->opt; | |
108 | fl->opt = NULL; | |
109 | kfree(opt); | |
110 | } | |
111 | if (!timer_pending(&ip6_fl_gc_timer) || | |
112 | time_after(ip6_fl_gc_timer.expires, ttd)) | |
113 | mod_timer(&ip6_fl_gc_timer, ttd); | |
114 | } | |
115 | ||
116 | write_unlock_bh(&ip6_fl_lock); | |
117 | } | |
118 | ||
119 | static void ip6_fl_gc(unsigned long dummy) | |
120 | { | |
121 | int i; | |
122 | unsigned long now = jiffies; | |
123 | unsigned long sched = 0; | |
124 | ||
125 | write_lock(&ip6_fl_lock); | |
126 | ||
127 | for (i=0; i<=FL_HASH_MASK; i++) { | |
128 | struct ip6_flowlabel *fl, **flp; | |
129 | flp = &fl_ht[i]; | |
130 | while ((fl=*flp) != NULL) { | |
131 | if (atomic_read(&fl->users) == 0) { | |
132 | unsigned long ttd = fl->lastuse + fl->linger; | |
133 | if (time_after(ttd, fl->expires)) | |
134 | fl->expires = ttd; | |
135 | ttd = fl->expires; | |
136 | if (time_after_eq(now, ttd)) { | |
137 | *flp = fl->next; | |
138 | fl_free(fl); | |
139 | atomic_dec(&fl_size); | |
140 | continue; | |
141 | } | |
142 | if (!sched || time_before(ttd, sched)) | |
143 | sched = ttd; | |
144 | } | |
145 | flp = &fl->next; | |
146 | } | |
147 | } | |
148 | if (!sched && atomic_read(&fl_size)) | |
149 | sched = now + FL_MAX_LINGER; | |
150 | if (sched) { | |
151 | ip6_fl_gc_timer.expires = sched; | |
152 | add_timer(&ip6_fl_gc_timer); | |
153 | } | |
154 | write_unlock(&ip6_fl_lock); | |
155 | } | |
156 | ||
78c2e502 | 157 | static struct ip6_flowlabel *fl_intern(struct ip6_flowlabel *fl, __be32 label) |
1da177e4 | 158 | { |
78c2e502 PE |
159 | struct ip6_flowlabel *lfl; |
160 | ||
1da177e4 LT |
161 | fl->label = label & IPV6_FLOWLABEL_MASK; |
162 | ||
163 | write_lock_bh(&ip6_fl_lock); | |
164 | if (label == 0) { | |
165 | for (;;) { | |
166 | fl->label = htonl(net_random())&IPV6_FLOWLABEL_MASK; | |
167 | if (fl->label) { | |
1da177e4 LT |
168 | lfl = __fl_lookup(fl->label); |
169 | if (lfl == NULL) | |
170 | break; | |
171 | } | |
172 | } | |
78c2e502 PE |
173 | } else { |
174 | /* | |
175 | * we dropper the ip6_fl_lock, so this entry could reappear | |
176 | * and we need to recheck with it. | |
177 | * | |
178 | * OTOH no need to search the active socket first, like it is | |
179 | * done in ipv6_flowlabel_opt - sock is locked, so new entry | |
180 | * with the same label can only appear on another sock | |
181 | */ | |
182 | lfl = __fl_lookup(fl->label); | |
183 | if (lfl != NULL) { | |
184 | atomic_inc(&lfl->users); | |
185 | write_unlock_bh(&ip6_fl_lock); | |
186 | return lfl; | |
187 | } | |
1da177e4 LT |
188 | } |
189 | ||
190 | fl->lastuse = jiffies; | |
191 | fl->next = fl_ht[FL_HASH(fl->label)]; | |
192 | fl_ht[FL_HASH(fl->label)] = fl; | |
193 | atomic_inc(&fl_size); | |
194 | write_unlock_bh(&ip6_fl_lock); | |
78c2e502 | 195 | return NULL; |
1da177e4 LT |
196 | } |
197 | ||
198 | ||
199 | ||
200 | /* Socket flowlabel lists */ | |
201 | ||
90bcaf7b | 202 | struct ip6_flowlabel * fl6_sock_lookup(struct sock *sk, __be32 label) |
1da177e4 LT |
203 | { |
204 | struct ipv6_fl_socklist *sfl; | |
205 | struct ipv6_pinfo *np = inet6_sk(sk); | |
206 | ||
207 | label &= IPV6_FLOWLABEL_MASK; | |
208 | ||
bd0bf577 | 209 | read_lock_bh(&ip6_sk_fl_lock); |
1da177e4 LT |
210 | for (sfl=np->ipv6_fl_list; sfl; sfl = sfl->next) { |
211 | struct ip6_flowlabel *fl = sfl->fl; | |
212 | if (fl->label == label) { | |
213 | fl->lastuse = jiffies; | |
214 | atomic_inc(&fl->users); | |
52f095ee | 215 | read_unlock_bh(&ip6_sk_fl_lock); |
1da177e4 LT |
216 | return fl; |
217 | } | |
218 | } | |
bd0bf577 | 219 | read_unlock_bh(&ip6_sk_fl_lock); |
1da177e4 LT |
220 | return NULL; |
221 | } | |
222 | ||
3cf3dc6c ACM |
223 | EXPORT_SYMBOL_GPL(fl6_sock_lookup); |
224 | ||
1da177e4 LT |
225 | void fl6_free_socklist(struct sock *sk) |
226 | { | |
227 | struct ipv6_pinfo *np = inet6_sk(sk); | |
228 | struct ipv6_fl_socklist *sfl; | |
229 | ||
230 | while ((sfl = np->ipv6_fl_list) != NULL) { | |
231 | np->ipv6_fl_list = sfl->next; | |
232 | fl_release(sfl->fl); | |
233 | kfree(sfl); | |
234 | } | |
235 | } | |
236 | ||
237 | /* Service routines */ | |
238 | ||
239 | ||
240 | /* | |
241 | It is the only difficult place. flowlabel enforces equal headers | |
242 | before and including routing header, however user may supply options | |
243 | following rthdr. | |
244 | */ | |
245 | ||
246 | struct ipv6_txoptions *fl6_merge_options(struct ipv6_txoptions * opt_space, | |
247 | struct ip6_flowlabel * fl, | |
248 | struct ipv6_txoptions * fopt) | |
249 | { | |
df9890c3 | 250 | struct ipv6_txoptions * fl_opt = fl->opt; |
1ab1457c | 251 | |
df9890c3 YH |
252 | if (fopt == NULL || fopt->opt_flen == 0) |
253 | return fl_opt; | |
1ab1457c | 254 | |
1da177e4 LT |
255 | if (fl_opt != NULL) { |
256 | opt_space->hopopt = fl_opt->hopopt; | |
df9890c3 | 257 | opt_space->dst0opt = fl_opt->dst0opt; |
1da177e4 LT |
258 | opt_space->srcrt = fl_opt->srcrt; |
259 | opt_space->opt_nflen = fl_opt->opt_nflen; | |
260 | } else { | |
261 | if (fopt->opt_nflen == 0) | |
262 | return fopt; | |
263 | opt_space->hopopt = NULL; | |
264 | opt_space->dst0opt = NULL; | |
265 | opt_space->srcrt = NULL; | |
266 | opt_space->opt_nflen = 0; | |
267 | } | |
268 | opt_space->dst1opt = fopt->dst1opt; | |
1da177e4 LT |
269 | opt_space->opt_flen = fopt->opt_flen; |
270 | return opt_space; | |
271 | } | |
272 | ||
273 | static unsigned long check_linger(unsigned long ttl) | |
274 | { | |
275 | if (ttl < FL_MIN_LINGER) | |
276 | return FL_MIN_LINGER*HZ; | |
277 | if (ttl > FL_MAX_LINGER && !capable(CAP_NET_ADMIN)) | |
278 | return 0; | |
279 | return ttl*HZ; | |
280 | } | |
281 | ||
282 | static int fl6_renew(struct ip6_flowlabel *fl, unsigned long linger, unsigned long expires) | |
283 | { | |
284 | linger = check_linger(linger); | |
285 | if (!linger) | |
286 | return -EPERM; | |
287 | expires = check_linger(expires); | |
288 | if (!expires) | |
289 | return -EPERM; | |
290 | fl->lastuse = jiffies; | |
291 | if (time_before(fl->linger, linger)) | |
292 | fl->linger = linger; | |
293 | if (time_before(expires, fl->linger)) | |
294 | expires = fl->linger; | |
295 | if (time_before(fl->expires, fl->lastuse + expires)) | |
296 | fl->expires = fl->lastuse + expires; | |
297 | return 0; | |
298 | } | |
299 | ||
300 | static struct ip6_flowlabel * | |
301 | fl_create(struct in6_flowlabel_req *freq, char __user *optval, int optlen, int *err_p) | |
302 | { | |
303 | struct ip6_flowlabel *fl; | |
304 | int olen; | |
305 | int addr_type; | |
306 | int err; | |
307 | ||
308 | err = -ENOMEM; | |
0c600eda | 309 | fl = kzalloc(sizeof(*fl), GFP_KERNEL); |
1da177e4 LT |
310 | if (fl == NULL) |
311 | goto done; | |
1da177e4 LT |
312 | |
313 | olen = optlen - CMSG_ALIGN(sizeof(*freq)); | |
314 | if (olen > 0) { | |
315 | struct msghdr msg; | |
316 | struct flowi flowi; | |
317 | int junk; | |
318 | ||
319 | err = -ENOMEM; | |
320 | fl->opt = kmalloc(sizeof(*fl->opt) + olen, GFP_KERNEL); | |
321 | if (fl->opt == NULL) | |
322 | goto done; | |
323 | ||
324 | memset(fl->opt, 0, sizeof(*fl->opt)); | |
325 | fl->opt->tot_len = sizeof(*fl->opt) + olen; | |
326 | err = -EFAULT; | |
327 | if (copy_from_user(fl->opt+1, optval+CMSG_ALIGN(sizeof(*freq)), olen)) | |
328 | goto done; | |
329 | ||
330 | msg.msg_controllen = olen; | |
331 | msg.msg_control = (void*)(fl->opt+1); | |
332 | flowi.oif = 0; | |
333 | ||
41a1f8ea | 334 | err = datagram_send_ctl(&msg, &flowi, fl->opt, &junk, &junk); |
1da177e4 LT |
335 | if (err) |
336 | goto done; | |
337 | err = -EINVAL; | |
338 | if (fl->opt->opt_flen) | |
339 | goto done; | |
340 | if (fl->opt->opt_nflen == 0) { | |
341 | kfree(fl->opt); | |
342 | fl->opt = NULL; | |
343 | } | |
344 | } | |
345 | ||
346 | fl->expires = jiffies; | |
347 | err = fl6_renew(fl, freq->flr_linger, freq->flr_expires); | |
348 | if (err) | |
349 | goto done; | |
350 | fl->share = freq->flr_share; | |
351 | addr_type = ipv6_addr_type(&freq->flr_dst); | |
352 | if ((addr_type&IPV6_ADDR_MAPPED) | |
c6817e4c JM |
353 | || addr_type == IPV6_ADDR_ANY) { |
354 | err = -EINVAL; | |
1da177e4 | 355 | goto done; |
c6817e4c | 356 | } |
1da177e4 LT |
357 | ipv6_addr_copy(&fl->dst, &freq->flr_dst); |
358 | atomic_set(&fl->users, 1); | |
359 | switch (fl->share) { | |
360 | case IPV6_FL_S_EXCL: | |
361 | case IPV6_FL_S_ANY: | |
362 | break; | |
363 | case IPV6_FL_S_PROCESS: | |
364 | fl->owner = current->pid; | |
365 | break; | |
366 | case IPV6_FL_S_USER: | |
367 | fl->owner = current->euid; | |
368 | break; | |
369 | default: | |
370 | err = -EINVAL; | |
371 | goto done; | |
372 | } | |
373 | return fl; | |
374 | ||
375 | done: | |
376 | fl_free(fl); | |
377 | *err_p = err; | |
378 | return NULL; | |
379 | } | |
380 | ||
381 | static int mem_check(struct sock *sk) | |
382 | { | |
383 | struct ipv6_pinfo *np = inet6_sk(sk); | |
384 | struct ipv6_fl_socklist *sfl; | |
385 | int room = FL_MAX_SIZE - atomic_read(&fl_size); | |
386 | int count = 0; | |
387 | ||
388 | if (room > FL_MAX_SIZE - FL_MAX_PER_SOCK) | |
389 | return 0; | |
390 | ||
391 | for (sfl = np->ipv6_fl_list; sfl; sfl = sfl->next) | |
392 | count++; | |
393 | ||
394 | if (room <= 0 || | |
395 | ((count >= FL_MAX_PER_SOCK || | |
396 | (count > 0 && room < FL_MAX_SIZE/2) || room < FL_MAX_SIZE/4) | |
397 | && !capable(CAP_NET_ADMIN))) | |
398 | return -ENOBUFS; | |
399 | ||
400 | return 0; | |
401 | } | |
402 | ||
403 | static int ipv6_hdr_cmp(struct ipv6_opt_hdr *h1, struct ipv6_opt_hdr *h2) | |
404 | { | |
405 | if (h1 == h2) | |
406 | return 0; | |
407 | if (h1 == NULL || h2 == NULL) | |
408 | return 1; | |
409 | if (h1->hdrlen != h2->hdrlen) | |
410 | return 1; | |
411 | return memcmp(h1+1, h2+1, ((h1->hdrlen+1)<<3) - sizeof(*h1)); | |
412 | } | |
413 | ||
414 | static int ipv6_opt_cmp(struct ipv6_txoptions *o1, struct ipv6_txoptions *o2) | |
415 | { | |
416 | if (o1 == o2) | |
417 | return 0; | |
418 | if (o1 == NULL || o2 == NULL) | |
419 | return 1; | |
420 | if (o1->opt_nflen != o2->opt_nflen) | |
421 | return 1; | |
422 | if (ipv6_hdr_cmp(o1->hopopt, o2->hopopt)) | |
423 | return 1; | |
424 | if (ipv6_hdr_cmp(o1->dst0opt, o2->dst0opt)) | |
425 | return 1; | |
426 | if (ipv6_hdr_cmp((struct ipv6_opt_hdr *)o1->srcrt, (struct ipv6_opt_hdr *)o2->srcrt)) | |
427 | return 1; | |
428 | return 0; | |
429 | } | |
430 | ||
04028045 PE |
431 | static inline void fl_link(struct ipv6_pinfo *np, struct ipv6_fl_socklist *sfl, |
432 | struct ip6_flowlabel *fl) | |
433 | { | |
434 | write_lock_bh(&ip6_sk_fl_lock); | |
435 | sfl->fl = fl; | |
436 | sfl->next = np->ipv6_fl_list; | |
437 | np->ipv6_fl_list = sfl; | |
438 | write_unlock_bh(&ip6_sk_fl_lock); | |
439 | } | |
440 | ||
1da177e4 LT |
441 | int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen) |
442 | { | |
443 | int err; | |
444 | struct ipv6_pinfo *np = inet6_sk(sk); | |
445 | struct in6_flowlabel_req freq; | |
446 | struct ipv6_fl_socklist *sfl1=NULL; | |
447 | struct ipv6_fl_socklist *sfl, **sflp; | |
78c2e502 PE |
448 | struct ip6_flowlabel *fl, *fl1 = NULL; |
449 | ||
1da177e4 LT |
450 | |
451 | if (optlen < sizeof(freq)) | |
452 | return -EINVAL; | |
453 | ||
454 | if (copy_from_user(&freq, optval, sizeof(freq))) | |
455 | return -EFAULT; | |
456 | ||
457 | switch (freq.flr_action) { | |
458 | case IPV6_FL_A_PUT: | |
459 | write_lock_bh(&ip6_sk_fl_lock); | |
460 | for (sflp = &np->ipv6_fl_list; (sfl=*sflp)!=NULL; sflp = &sfl->next) { | |
461 | if (sfl->fl->label == freq.flr_label) { | |
462 | if (freq.flr_label == (np->flow_label&IPV6_FLOWLABEL_MASK)) | |
463 | np->flow_label &= ~IPV6_FLOWLABEL_MASK; | |
464 | *sflp = sfl->next; | |
465 | write_unlock_bh(&ip6_sk_fl_lock); | |
466 | fl_release(sfl->fl); | |
467 | kfree(sfl); | |
468 | return 0; | |
469 | } | |
470 | } | |
471 | write_unlock_bh(&ip6_sk_fl_lock); | |
472 | return -ESRCH; | |
473 | ||
474 | case IPV6_FL_A_RENEW: | |
475 | read_lock_bh(&ip6_sk_fl_lock); | |
476 | for (sfl = np->ipv6_fl_list; sfl; sfl = sfl->next) { | |
477 | if (sfl->fl->label == freq.flr_label) { | |
478 | err = fl6_renew(sfl->fl, freq.flr_linger, freq.flr_expires); | |
479 | read_unlock_bh(&ip6_sk_fl_lock); | |
480 | return err; | |
481 | } | |
482 | } | |
483 | read_unlock_bh(&ip6_sk_fl_lock); | |
484 | ||
485 | if (freq.flr_share == IPV6_FL_S_NONE && capable(CAP_NET_ADMIN)) { | |
486 | fl = fl_lookup(freq.flr_label); | |
487 | if (fl) { | |
488 | err = fl6_renew(fl, freq.flr_linger, freq.flr_expires); | |
489 | fl_release(fl); | |
490 | return err; | |
491 | } | |
492 | } | |
493 | return -ESRCH; | |
494 | ||
495 | case IPV6_FL_A_GET: | |
496 | if (freq.flr_label & ~IPV6_FLOWLABEL_MASK) | |
497 | return -EINVAL; | |
498 | ||
499 | fl = fl_create(&freq, optval, optlen, &err); | |
500 | if (fl == NULL) | |
501 | return err; | |
502 | sfl1 = kmalloc(sizeof(*sfl1), GFP_KERNEL); | |
503 | ||
504 | if (freq.flr_label) { | |
1da177e4 LT |
505 | err = -EEXIST; |
506 | read_lock_bh(&ip6_sk_fl_lock); | |
507 | for (sfl = np->ipv6_fl_list; sfl; sfl = sfl->next) { | |
508 | if (sfl->fl->label == freq.flr_label) { | |
509 | if (freq.flr_flags&IPV6_FL_F_EXCL) { | |
510 | read_unlock_bh(&ip6_sk_fl_lock); | |
511 | goto done; | |
512 | } | |
513 | fl1 = sfl->fl; | |
4ea6a804 | 514 | atomic_inc(&fl1->users); |
1da177e4 LT |
515 | break; |
516 | } | |
517 | } | |
518 | read_unlock_bh(&ip6_sk_fl_lock); | |
519 | ||
520 | if (fl1 == NULL) | |
521 | fl1 = fl_lookup(freq.flr_label); | |
522 | if (fl1) { | |
78c2e502 | 523 | recheck: |
1da177e4 LT |
524 | err = -EEXIST; |
525 | if (freq.flr_flags&IPV6_FL_F_EXCL) | |
526 | goto release; | |
527 | err = -EPERM; | |
528 | if (fl1->share == IPV6_FL_S_EXCL || | |
529 | fl1->share != fl->share || | |
530 | fl1->owner != fl->owner) | |
531 | goto release; | |
532 | ||
533 | err = -EINVAL; | |
534 | if (!ipv6_addr_equal(&fl1->dst, &fl->dst) || | |
535 | ipv6_opt_cmp(fl1->opt, fl->opt)) | |
536 | goto release; | |
537 | ||
538 | err = -ENOMEM; | |
539 | if (sfl1 == NULL) | |
540 | goto release; | |
541 | if (fl->linger > fl1->linger) | |
542 | fl1->linger = fl->linger; | |
543 | if ((long)(fl->expires - fl1->expires) > 0) | |
544 | fl1->expires = fl->expires; | |
04028045 | 545 | fl_link(np, sfl1, fl1); |
1da177e4 LT |
546 | fl_free(fl); |
547 | return 0; | |
548 | ||
549 | release: | |
550 | fl_release(fl1); | |
551 | goto done; | |
552 | } | |
553 | } | |
554 | err = -ENOENT; | |
555 | if (!(freq.flr_flags&IPV6_FL_F_CREATE)) | |
556 | goto done; | |
557 | ||
558 | err = -ENOMEM; | |
559 | if (sfl1 == NULL || (err = mem_check(sk)) != 0) | |
560 | goto done; | |
561 | ||
78c2e502 PE |
562 | fl1 = fl_intern(fl, freq.flr_label); |
563 | if (fl1 != NULL) | |
564 | goto recheck; | |
1da177e4 | 565 | |
6c94d361 DM |
566 | if (!freq.flr_label) { |
567 | if (copy_to_user(&((struct in6_flowlabel_req __user *) optval)->flr_label, | |
568 | &fl->label, sizeof(fl->label))) { | |
569 | /* Intentionally ignore fault. */ | |
570 | } | |
571 | } | |
1da177e4 | 572 | |
04028045 | 573 | fl_link(np, sfl1, fl); |
1da177e4 LT |
574 | return 0; |
575 | ||
576 | default: | |
577 | return -EINVAL; | |
578 | } | |
579 | ||
580 | done: | |
581 | fl_free(fl); | |
582 | kfree(sfl1); | |
583 | return err; | |
584 | } | |
585 | ||
586 | #ifdef CONFIG_PROC_FS | |
587 | ||
588 | struct ip6fl_iter_state { | |
589 | int bucket; | |
590 | }; | |
591 | ||
592 | #define ip6fl_seq_private(seq) ((struct ip6fl_iter_state *)(seq)->private) | |
593 | ||
594 | static struct ip6_flowlabel *ip6fl_get_first(struct seq_file *seq) | |
595 | { | |
596 | struct ip6_flowlabel *fl = NULL; | |
597 | struct ip6fl_iter_state *state = ip6fl_seq_private(seq); | |
598 | ||
599 | for (state->bucket = 0; state->bucket <= FL_HASH_MASK; ++state->bucket) { | |
600 | if (fl_ht[state->bucket]) { | |
601 | fl = fl_ht[state->bucket]; | |
602 | break; | |
603 | } | |
604 | } | |
605 | return fl; | |
606 | } | |
607 | ||
608 | static struct ip6_flowlabel *ip6fl_get_next(struct seq_file *seq, struct ip6_flowlabel *fl) | |
609 | { | |
610 | struct ip6fl_iter_state *state = ip6fl_seq_private(seq); | |
611 | ||
612 | fl = fl->next; | |
613 | while (!fl) { | |
614 | if (++state->bucket <= FL_HASH_MASK) | |
615 | fl = fl_ht[state->bucket]; | |
bcd62075 JM |
616 | else |
617 | break; | |
1da177e4 LT |
618 | } |
619 | return fl; | |
620 | } | |
621 | ||
622 | static struct ip6_flowlabel *ip6fl_get_idx(struct seq_file *seq, loff_t pos) | |
623 | { | |
624 | struct ip6_flowlabel *fl = ip6fl_get_first(seq); | |
625 | if (fl) | |
626 | while (pos && (fl = ip6fl_get_next(seq, fl)) != NULL) | |
627 | --pos; | |
628 | return pos ? NULL : fl; | |
629 | } | |
630 | ||
631 | static void *ip6fl_seq_start(struct seq_file *seq, loff_t *pos) | |
9a429c49 | 632 | __acquires(ip6_fl_lock) |
1da177e4 LT |
633 | { |
634 | read_lock_bh(&ip6_fl_lock); | |
635 | return *pos ? ip6fl_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; | |
636 | } | |
637 | ||
638 | static void *ip6fl_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
639 | { | |
640 | struct ip6_flowlabel *fl; | |
641 | ||
642 | if (v == SEQ_START_TOKEN) | |
643 | fl = ip6fl_get_first(seq); | |
644 | else | |
645 | fl = ip6fl_get_next(seq, v); | |
646 | ++*pos; | |
647 | return fl; | |
648 | } | |
649 | ||
650 | static void ip6fl_seq_stop(struct seq_file *seq, void *v) | |
9a429c49 | 651 | __releases(ip6_fl_lock) |
1da177e4 LT |
652 | { |
653 | read_unlock_bh(&ip6_fl_lock); | |
654 | } | |
655 | ||
1b7c2dbc | 656 | static int ip6fl_seq_show(struct seq_file *seq, void *v) |
1da177e4 | 657 | { |
1b7c2dbc JM |
658 | if (v == SEQ_START_TOKEN) |
659 | seq_printf(seq, "%-5s %-1s %-6s %-6s %-6s %-8s %-32s %s\n", | |
660 | "Label", "S", "Owner", "Users", "Linger", "Expires", "Dst", "Opt"); | |
661 | else { | |
662 | struct ip6_flowlabel *fl = v; | |
1da177e4 | 663 | seq_printf(seq, |
9343e79a | 664 | "%05X %-1d %-6d %-6d %-6ld %-8ld " NIP6_SEQFMT " %-4d\n", |
1da177e4 LT |
665 | (unsigned)ntohl(fl->label), |
666 | fl->share, | |
667 | (unsigned)fl->owner, | |
668 | atomic_read(&fl->users), | |
669 | fl->linger/HZ, | |
670 | (long)(fl->expires - jiffies)/HZ, | |
671 | NIP6(fl->dst), | |
672 | fl->opt ? fl->opt->opt_nflen : 0); | |
1da177e4 | 673 | } |
1da177e4 LT |
674 | return 0; |
675 | } | |
676 | ||
56b3d975 | 677 | static const struct seq_operations ip6fl_seq_ops = { |
1da177e4 LT |
678 | .start = ip6fl_seq_start, |
679 | .next = ip6fl_seq_next, | |
680 | .stop = ip6fl_seq_stop, | |
681 | .show = ip6fl_seq_show, | |
682 | }; | |
683 | ||
684 | static int ip6fl_seq_open(struct inode *inode, struct file *file) | |
685 | { | |
cf7732e4 PE |
686 | return seq_open_private(file, &ip6fl_seq_ops, |
687 | sizeof(struct ip6fl_iter_state)); | |
1da177e4 LT |
688 | } |
689 | ||
9a32144e | 690 | static const struct file_operations ip6fl_seq_fops = { |
1da177e4 LT |
691 | .owner = THIS_MODULE, |
692 | .open = ip6fl_seq_open, | |
693 | .read = seq_read, | |
694 | .llseek = seq_lseek, | |
695 | .release = seq_release_private, | |
696 | }; | |
1da177e4 | 697 | |
0a3e78ac DL |
698 | static int ip6_flowlabel_proc_init(struct net *net) |
699 | { | |
700 | if (!proc_net_fops_create(net, "ip6_flowlabel", S_IRUGO, &ip6fl_seq_fops)) | |
701 | return -ENOMEM; | |
702 | return 0; | |
703 | } | |
1da177e4 | 704 | |
0a3e78ac | 705 | static void ip6_flowlabel_proc_fini(struct net *net) |
1da177e4 | 706 | { |
0a3e78ac DL |
707 | proc_net_remove(net, "ip6_flowlabel"); |
708 | } | |
709 | #else | |
710 | static inline int ip6_flowlabel_proc_init(struct net *net) | |
711 | { | |
712 | return 0; | |
713 | } | |
714 | static inline void ip6_flowlabel_proc_fini(struct net *net) | |
715 | { | |
716 | return ; | |
717 | } | |
1da177e4 | 718 | #endif |
0a3e78ac DL |
719 | |
720 | int ip6_flowlabel_init(void) | |
721 | { | |
722 | return ip6_flowlabel_proc_init(&init_net); | |
1da177e4 LT |
723 | } |
724 | ||
725 | void ip6_flowlabel_cleanup(void) | |
726 | { | |
727 | del_timer(&ip6_fl_gc_timer); | |
0a3e78ac | 728 | ip6_flowlabel_proc_fini(&init_net); |
1da177e4 | 729 | } |