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Merge branch 'hwmon-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jdelv...
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / sunrpc / svcauth_unix.c
blob560677d187f1b0fc7eb3d72c119aa848eb306145
1 #include <linux/types.h>
2 #include <linux/sched.h>
3 #include <linux/module.h>
4 #include <linux/sunrpc/types.h>
5 #include <linux/sunrpc/xdr.h>
6 #include <linux/sunrpc/svcsock.h>
7 #include <linux/sunrpc/svcauth.h>
8 #include <linux/sunrpc/gss_api.h>
9 #include <linux/err.h>
10 #include <linux/seq_file.h>
11 #include <linux/hash.h>
12 #include <linux/string.h>
13 #include <linux/slab.h>
14 #include <net/sock.h>
15 #include <net/ipv6.h>
16 #include <linux/kernel.h>
17 #define RPCDBG_FACILITY RPCDBG_AUTH
18
19 #include <linux/sunrpc/clnt.h>
20
21 #include "netns.h"
22
23 /*
24 * AUTHUNIX and AUTHNULL credentials are both handled here.
25 * AUTHNULL is treated just like AUTHUNIX except that the uid/gid
26 * are always nobody (-2). i.e. we do the same IP address checks for
27 * AUTHNULL as for AUTHUNIX, and that is done here.
28 */
29
30
31 struct unix_domain {
32 struct auth_domain h;
33 int addr_changes;
34 /* other stuff later */
35 };
36
37 extern struct auth_ops svcauth_unix;
38
39 struct auth_domain *unix_domain_find(char *name)
40 {
41 struct auth_domain *rv;
42 struct unix_domain *new = NULL;
43
44 rv = auth_domain_lookup(name, NULL);
45 while(1) {
46 if (rv) {
47 if (new && rv != &new->h)
48 auth_domain_put(&new->h);
49
50 if (rv->flavour != &svcauth_unix) {
51 auth_domain_put(rv);
52 return NULL;
53 }
54 return rv;
55 }
56
57 new = kmalloc(sizeof(*new), GFP_KERNEL);
58 if (new == NULL)
59 return NULL;
60 kref_init(&new->h.ref);
61 new->h.name = kstrdup(name, GFP_KERNEL);
62 if (new->h.name == NULL) {
63 kfree(new);
64 return NULL;
65 }
66 new->h.flavour = &svcauth_unix;
67 new->addr_changes = 0;
68 rv = auth_domain_lookup(name, &new->h);
69 }
70 }
71 EXPORT_SYMBOL_GPL(unix_domain_find);
72
73 static void svcauth_unix_domain_release(struct auth_domain *dom)
74 {
75 struct unix_domain *ud = container_of(dom, struct unix_domain, h);
76
77 kfree(dom->name);
78 kfree(ud);
79 }
80
81
82 /**************************************************
83 * cache for IP address to unix_domain
84 * as needed by AUTH_UNIX
85 */
86 #define IP_HASHBITS 8
87 #define IP_HASHMAX (1<<IP_HASHBITS)
88 #define IP_HASHMASK (IP_HASHMAX-1)
89
90 struct ip_map {
91 struct cache_head h;
92 char m_class[8]; /* e.g. "nfsd" */
93 struct in6_addr m_addr;
94 struct unix_domain *m_client;
95 int m_add_change;
96 };
97
98 static void ip_map_put(struct kref *kref)
99 {
100 struct cache_head *item = container_of(kref, struct cache_head, ref);
101 struct ip_map *im = container_of(item, struct ip_map,h);
102
103 if (test_bit(CACHE_VALID, &item->flags) &&
104 !test_bit(CACHE_NEGATIVE, &item->flags))
105 auth_domain_put(&im->m_client->h);
106 kfree(im);
107 }
108
109 #if IP_HASHBITS == 8
110 /* hash_long on a 64 bit machine is currently REALLY BAD for
111 * IP addresses in reverse-endian (i.e. on a little-endian machine).
112 * So use a trivial but reliable hash instead
113 */
114 static inline int hash_ip(__be32 ip)
115 {
116 int hash = (__force u32)ip ^ ((__force u32)ip>>16);
117 return (hash ^ (hash>>8)) & 0xff;
118 }
119 #endif
120 static inline int hash_ip6(struct in6_addr ip)
121 {
122 return (hash_ip(ip.s6_addr32[0]) ^
123 hash_ip(ip.s6_addr32[1]) ^
124 hash_ip(ip.s6_addr32[2]) ^
125 hash_ip(ip.s6_addr32[3]));
126 }
127 static int ip_map_match(struct cache_head *corig, struct cache_head *cnew)
128 {
129 struct ip_map *orig = container_of(corig, struct ip_map, h);
130 struct ip_map *new = container_of(cnew, struct ip_map, h);
131 return strcmp(orig->m_class, new->m_class) == 0 &&
132 ipv6_addr_equal(&orig->m_addr, &new->m_addr);
133 }
134 static void ip_map_init(struct cache_head *cnew, struct cache_head *citem)
135 {
136 struct ip_map *new = container_of(cnew, struct ip_map, h);
137 struct ip_map *item = container_of(citem, struct ip_map, h);
138
139 strcpy(new->m_class, item->m_class);
140 ipv6_addr_copy(&new->m_addr, &item->m_addr);
141 }
142 static void update(struct cache_head *cnew, struct cache_head *citem)
143 {
144 struct ip_map *new = container_of(cnew, struct ip_map, h);
145 struct ip_map *item = container_of(citem, struct ip_map, h);
146
147 kref_get(&item->m_client->h.ref);
148 new->m_client = item->m_client;
149 new->m_add_change = item->m_add_change;
150 }
151 static struct cache_head *ip_map_alloc(void)
152 {
153 struct ip_map *i = kmalloc(sizeof(*i), GFP_KERNEL);
154 if (i)
155 return &i->h;
156 else
157 return NULL;
158 }
159
160 static void ip_map_request(struct cache_detail *cd,
161 struct cache_head *h,
162 char **bpp, int *blen)
163 {
164 char text_addr[40];
165 struct ip_map *im = container_of(h, struct ip_map, h);
166
167 if (ipv6_addr_v4mapped(&(im->m_addr))) {
168 snprintf(text_addr, 20, "%pI4", &im->m_addr.s6_addr32[3]);
169 } else {
170 snprintf(text_addr, 40, "%pI6", &im->m_addr);
171 }
172 qword_add(bpp, blen, im->m_class);
173 qword_add(bpp, blen, text_addr);
174 (*bpp)[-1] = '\n';
175 }
176
177 static int ip_map_upcall(struct cache_detail *cd, struct cache_head *h)
178 {
179 return sunrpc_cache_pipe_upcall(cd, h, ip_map_request);
180 }
181
182 static struct ip_map *__ip_map_lookup(struct cache_detail *cd, char *class, struct in6_addr *addr);
183 static int __ip_map_update(struct cache_detail *cd, struct ip_map *ipm, struct unix_domain *udom, time_t expiry);
184
185 static int ip_map_parse(struct cache_detail *cd,
186 char *mesg, int mlen)
187 {
188 /* class ipaddress [domainname] */
189 /* should be safe just to use the start of the input buffer
190 * for scratch: */
191 char *buf = mesg;
192 int len;
193 char class[8];
194 union {
195 struct sockaddr sa;
196 struct sockaddr_in s4;
197 struct sockaddr_in6 s6;
198 } address;
199 struct sockaddr_in6 sin6;
200 int err;
201
202 struct ip_map *ipmp;
203 struct auth_domain *dom;
204 time_t expiry;
205
206 if (mesg[mlen-1] != '\n')
207 return -EINVAL;
208 mesg[mlen-1] = 0;
209
210 /* class */
211 len = qword_get(&mesg, class, sizeof(class));
212 if (len <= 0) return -EINVAL;
213
214 /* ip address */
215 len = qword_get(&mesg, buf, mlen);
216 if (len <= 0) return -EINVAL;
217
218 if (rpc_pton(buf, len, &address.sa, sizeof(address)) == 0)
219 return -EINVAL;
220 switch (address.sa.sa_family) {
221 case AF_INET:
222 /* Form a mapped IPv4 address in sin6 */
223 sin6.sin6_family = AF_INET6;
224 ipv6_addr_set_v4mapped(address.s4.sin_addr.s_addr,
225 &sin6.sin6_addr);
226 break;
227 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
228 case AF_INET6:
229 memcpy(&sin6, &address.s6, sizeof(sin6));
230 break;
231 #endif
232 default:
233 return -EINVAL;
234 }
235
236 expiry = get_expiry(&mesg);
237 if (expiry ==0)
238 return -EINVAL;
239
240 /* domainname, or empty for NEGATIVE */
241 len = qword_get(&mesg, buf, mlen);
242 if (len < 0) return -EINVAL;
243
244 if (len) {
245 dom = unix_domain_find(buf);
246 if (dom == NULL)
247 return -ENOENT;
248 } else
249 dom = NULL;
250
251 /* IPv6 scope IDs are ignored for now */
252 ipmp = __ip_map_lookup(cd, class, &sin6.sin6_addr);
253 if (ipmp) {
254 err = __ip_map_update(cd, ipmp,
255 container_of(dom, struct unix_domain, h),
256 expiry);
257 } else
258 err = -ENOMEM;
259
260 if (dom)
261 auth_domain_put(dom);
262
263 cache_flush();
264 return err;
265 }
266
267 static int ip_map_show(struct seq_file *m,
268 struct cache_detail *cd,
269 struct cache_head *h)
270 {
271 struct ip_map *im;
272 struct in6_addr addr;
273 char *dom = "-no-domain-";
274
275 if (h == NULL) {
276 seq_puts(m, "#class IP domain\n");
277 return 0;
278 }
279 im = container_of(h, struct ip_map, h);
280 /* class addr domain */
281 ipv6_addr_copy(&addr, &im->m_addr);
282
283 if (test_bit(CACHE_VALID, &h->flags) &&
284 !test_bit(CACHE_NEGATIVE, &h->flags))
285 dom = im->m_client->h.name;
286
287 if (ipv6_addr_v4mapped(&addr)) {
288 seq_printf(m, "%s %pI4 %s\n",
289 im->m_class, &addr.s6_addr32[3], dom);
290 } else {
291 seq_printf(m, "%s %pI6 %s\n", im->m_class, &addr, dom);
292 }
293 return 0;
294 }
295
296
297 static struct ip_map *__ip_map_lookup(struct cache_detail *cd, char *class,
298 struct in6_addr *addr)
299 {
300 struct ip_map ip;
301 struct cache_head *ch;
302
303 strcpy(ip.m_class, class);
304 ipv6_addr_copy(&ip.m_addr, addr);
305 ch = sunrpc_cache_lookup(cd, &ip.h,
306 hash_str(class, IP_HASHBITS) ^
307 hash_ip6(*addr));
308
309 if (ch)
310 return container_of(ch, struct ip_map, h);
311 else
312 return NULL;
313 }
314
315 static inline struct ip_map *ip_map_lookup(struct net *net, char *class,
316 struct in6_addr *addr)
317 {
318 struct sunrpc_net *sn;
319
320 sn = net_generic(net, sunrpc_net_id);
321 return __ip_map_lookup(sn->ip_map_cache, class, addr);
322 }
323
324 static int __ip_map_update(struct cache_detail *cd, struct ip_map *ipm,
325 struct unix_domain *udom, time_t expiry)
326 {
327 struct ip_map ip;
328 struct cache_head *ch;
329
330 ip.m_client = udom;
331 ip.h.flags = 0;
332 if (!udom)
333 set_bit(CACHE_NEGATIVE, &ip.h.flags);
334 else {
335 ip.m_add_change = udom->addr_changes;
336 /* if this is from the legacy set_client system call,
337 * we need m_add_change to be one higher
338 */
339 if (expiry == NEVER)
340 ip.m_add_change++;
341 }
342 ip.h.expiry_time = expiry;
343 ch = sunrpc_cache_update(cd, &ip.h, &ipm->h,
344 hash_str(ipm->m_class, IP_HASHBITS) ^
345 hash_ip6(ipm->m_addr));
346 if (!ch)
347 return -ENOMEM;
348 cache_put(ch, cd);
349 return 0;
350 }
351
352 static inline int ip_map_update(struct net *net, struct ip_map *ipm,
353 struct unix_domain *udom, time_t expiry)
354 {
355 struct sunrpc_net *sn;
356
357 sn = net_generic(net, sunrpc_net_id);
358 return __ip_map_update(sn->ip_map_cache, ipm, udom, expiry);
359 }
360
361 int auth_unix_add_addr(struct net *net, struct in6_addr *addr, struct auth_domain *dom)
362 {
363 struct unix_domain *udom;
364 struct ip_map *ipmp;
365
366 if (dom->flavour != &svcauth_unix)
367 return -EINVAL;
368 udom = container_of(dom, struct unix_domain, h);
369 ipmp = ip_map_lookup(net, "nfsd", addr);
370
371 if (ipmp)
372 return ip_map_update(net, ipmp, udom, NEVER);
373 else
374 return -ENOMEM;
375 }
376 EXPORT_SYMBOL_GPL(auth_unix_add_addr);
377
378 int auth_unix_forget_old(struct auth_domain *dom)
379 {
380 struct unix_domain *udom;
381
382 if (dom->flavour != &svcauth_unix)
383 return -EINVAL;
384 udom = container_of(dom, struct unix_domain, h);
385 udom->addr_changes++;
386 return 0;
387 }
388 EXPORT_SYMBOL_GPL(auth_unix_forget_old);
389
390 struct auth_domain *auth_unix_lookup(struct net *net, struct in6_addr *addr)
391 {
392 struct ip_map *ipm;
393 struct auth_domain *rv;
394 struct sunrpc_net *sn;
395
396 sn = net_generic(net, sunrpc_net_id);
397 ipm = ip_map_lookup(net, "nfsd", addr);
398
399 if (!ipm)
400 return NULL;
401 if (cache_check(sn->ip_map_cache, &ipm->h, NULL))
402 return NULL;
403
404 if ((ipm->m_client->addr_changes - ipm->m_add_change) >0) {
405 if (test_and_set_bit(CACHE_NEGATIVE, &ipm->h.flags) == 0)
406 auth_domain_put(&ipm->m_client->h);
407 rv = NULL;
408 } else {
409 rv = &ipm->m_client->h;
410 kref_get(&rv->ref);
411 }
412 cache_put(&ipm->h, sn->ip_map_cache);
413 return rv;
414 }
415 EXPORT_SYMBOL_GPL(auth_unix_lookup);
416
417 void svcauth_unix_purge(void)
418 {
419 struct net *net;
420
421 for_each_net(net) {
422 struct sunrpc_net *sn;
423
424 sn = net_generic(net, sunrpc_net_id);
425 cache_purge(sn->ip_map_cache);
426 }
427 }
428 EXPORT_SYMBOL_GPL(svcauth_unix_purge);
429
430 static inline struct ip_map *
431 ip_map_cached_get(struct svc_xprt *xprt)
432 {
433 struct ip_map *ipm = NULL;
434 struct sunrpc_net *sn;
435
436 if (test_bit(XPT_CACHE_AUTH, &xprt->xpt_flags)) {
437 spin_lock(&xprt->xpt_lock);
438 ipm = xprt->xpt_auth_cache;
439 if (ipm != NULL) {
440 if (!cache_valid(&ipm->h)) {
441 /*
442 * The entry has been invalidated since it was
443 * remembered, e.g. by a second mount from the
444 * same IP address.
445 */
446 sn = net_generic(xprt->xpt_net, sunrpc_net_id);
447 xprt->xpt_auth_cache = NULL;
448 spin_unlock(&xprt->xpt_lock);
449 cache_put(&ipm->h, sn->ip_map_cache);
450 return NULL;
451 }
452 cache_get(&ipm->h);
453 }
454 spin_unlock(&xprt->xpt_lock);
455 }
456 return ipm;
457 }
458
459 static inline void
460 ip_map_cached_put(struct svc_xprt *xprt, struct ip_map *ipm)
461 {
462 if (test_bit(XPT_CACHE_AUTH, &xprt->xpt_flags)) {
463 spin_lock(&xprt->xpt_lock);
464 if (xprt->xpt_auth_cache == NULL) {
465 /* newly cached, keep the reference */
466 xprt->xpt_auth_cache = ipm;
467 ipm = NULL;
468 }
469 spin_unlock(&xprt->xpt_lock);
470 }
471 if (ipm) {
472 struct sunrpc_net *sn;
473
474 sn = net_generic(xprt->xpt_net, sunrpc_net_id);
475 cache_put(&ipm->h, sn->ip_map_cache);
476 }
477 }
478
479 void
480 svcauth_unix_info_release(struct svc_xprt *xpt)
481 {
482 struct ip_map *ipm;
483
484 ipm = xpt->xpt_auth_cache;
485 if (ipm != NULL) {
486 struct sunrpc_net *sn;
487
488 sn = net_generic(xpt->xpt_net, sunrpc_net_id);
489 cache_put(&ipm->h, sn->ip_map_cache);
490 }
491 }
492
493 /****************************************************************************
494 * auth.unix.gid cache
495 * simple cache to map a UID to a list of GIDs
496 * because AUTH_UNIX aka AUTH_SYS has a max of 16
497 */
498 #define GID_HASHBITS 8
499 #define GID_HASHMAX (1<<GID_HASHBITS)
500 #define GID_HASHMASK (GID_HASHMAX - 1)
501
502 struct unix_gid {
503 struct cache_head h;
504 uid_t uid;
505 struct group_info *gi;
506 };
507 static struct cache_head *gid_table[GID_HASHMAX];
508
509 static void unix_gid_put(struct kref *kref)
510 {
511 struct cache_head *item = container_of(kref, struct cache_head, ref);
512 struct unix_gid *ug = container_of(item, struct unix_gid, h);
513 if (test_bit(CACHE_VALID, &item->flags) &&
514 !test_bit(CACHE_NEGATIVE, &item->flags))
515 put_group_info(ug->gi);
516 kfree(ug);
517 }
518
519 static int unix_gid_match(struct cache_head *corig, struct cache_head *cnew)
520 {
521 struct unix_gid *orig = container_of(corig, struct unix_gid, h);
522 struct unix_gid *new = container_of(cnew, struct unix_gid, h);
523 return orig->uid == new->uid;
524 }
525 static void unix_gid_init(struct cache_head *cnew, struct cache_head *citem)
526 {
527 struct unix_gid *new = container_of(cnew, struct unix_gid, h);
528 struct unix_gid *item = container_of(citem, struct unix_gid, h);
529 new->uid = item->uid;
530 }
531 static void unix_gid_update(struct cache_head *cnew, struct cache_head *citem)
532 {
533 struct unix_gid *new = container_of(cnew, struct unix_gid, h);
534 struct unix_gid *item = container_of(citem, struct unix_gid, h);
535
536 get_group_info(item->gi);
537 new->gi = item->gi;
538 }
539 static struct cache_head *unix_gid_alloc(void)
540 {
541 struct unix_gid *g = kmalloc(sizeof(*g), GFP_KERNEL);
542 if (g)
543 return &g->h;
544 else
545 return NULL;
546 }
547
548 static void unix_gid_request(struct cache_detail *cd,
549 struct cache_head *h,
550 char **bpp, int *blen)
551 {
552 char tuid[20];
553 struct unix_gid *ug = container_of(h, struct unix_gid, h);
554
555 snprintf(tuid, 20, "%u", ug->uid);
556 qword_add(bpp, blen, tuid);
557 (*bpp)[-1] = '\n';
558 }
559
560 static int unix_gid_upcall(struct cache_detail *cd, struct cache_head *h)
561 {
562 return sunrpc_cache_pipe_upcall(cd, h, unix_gid_request);
563 }
564
565 static struct unix_gid *unix_gid_lookup(uid_t uid);
566 extern struct cache_detail unix_gid_cache;
567
568 static int unix_gid_parse(struct cache_detail *cd,
569 char *mesg, int mlen)
570 {
571 /* uid expiry Ngid gid0 gid1 ... gidN-1 */
572 int uid;
573 int gids;
574 int rv;
575 int i;
576 int err;
577 time_t expiry;
578 struct unix_gid ug, *ugp;
579
580 if (mlen <= 0 || mesg[mlen-1] != '\n')
581 return -EINVAL;
582 mesg[mlen-1] = 0;
583
584 rv = get_int(&mesg, &uid);
585 if (rv)
586 return -EINVAL;
587 ug.uid = uid;
588
589 expiry = get_expiry(&mesg);
590 if (expiry == 0)
591 return -EINVAL;
592
593 rv = get_int(&mesg, &gids);
594 if (rv || gids < 0 || gids > 8192)
595 return -EINVAL;
596
597 ug.gi = groups_alloc(gids);
598 if (!ug.gi)
599 return -ENOMEM;
600
601 for (i = 0 ; i < gids ; i++) {
602 int gid;
603 rv = get_int(&mesg, &gid);
604 err = -EINVAL;
605 if (rv)
606 goto out;
607 GROUP_AT(ug.gi, i) = gid;
608 }
609
610 ugp = unix_gid_lookup(uid);
611 if (ugp) {
612 struct cache_head *ch;
613 ug.h.flags = 0;
614 ug.h.expiry_time = expiry;
615 ch = sunrpc_cache_update(&unix_gid_cache,
616 &ug.h, &ugp->h,
617 hash_long(uid, GID_HASHBITS));
618 if (!ch)
619 err = -ENOMEM;
620 else {
621 err = 0;
622 cache_put(ch, &unix_gid_cache);
623 }
624 } else
625 err = -ENOMEM;
626 out:
627 if (ug.gi)
628 put_group_info(ug.gi);
629 return err;
630 }
631
632 static int unix_gid_show(struct seq_file *m,
633 struct cache_detail *cd,
634 struct cache_head *h)
635 {
636 struct unix_gid *ug;
637 int i;
638 int glen;
639
640 if (h == NULL) {
641 seq_puts(m, "#uid cnt: gids...\n");
642 return 0;
643 }
644 ug = container_of(h, struct unix_gid, h);
645 if (test_bit(CACHE_VALID, &h->flags) &&
646 !test_bit(CACHE_NEGATIVE, &h->flags))
647 glen = ug->gi->ngroups;
648 else
649 glen = 0;
650
651 seq_printf(m, "%u %d:", ug->uid, glen);
652 for (i = 0; i < glen; i++)
653 seq_printf(m, " %d", GROUP_AT(ug->gi, i));
654 seq_printf(m, "\n");
655 return 0;
656 }
657
658 struct cache_detail unix_gid_cache = {
659 .owner = THIS_MODULE,
660 .hash_size = GID_HASHMAX,
661 .hash_table = gid_table,
662 .name = "auth.unix.gid",
663 .cache_put = unix_gid_put,
664 .cache_upcall = unix_gid_upcall,
665 .cache_parse = unix_gid_parse,
666 .cache_show = unix_gid_show,
667 .match = unix_gid_match,
668 .init = unix_gid_init,
669 .update = unix_gid_update,
670 .alloc = unix_gid_alloc,
671 };
672
673 static struct unix_gid *unix_gid_lookup(uid_t uid)
674 {
675 struct unix_gid ug;
676 struct cache_head *ch;
677
678 ug.uid = uid;
679 ch = sunrpc_cache_lookup(&unix_gid_cache, &ug.h,
680 hash_long(uid, GID_HASHBITS));
681 if (ch)
682 return container_of(ch, struct unix_gid, h);
683 else
684 return NULL;
685 }
686
687 static struct group_info *unix_gid_find(uid_t uid, struct svc_rqst *rqstp)
688 {
689 struct unix_gid *ug;
690 struct group_info *gi;
691 int ret;
692
693 ug = unix_gid_lookup(uid);
694 if (!ug)
695 return ERR_PTR(-EAGAIN);
696 ret = cache_check(&unix_gid_cache, &ug->h, &rqstp->rq_chandle);
697 switch (ret) {
698 case -ENOENT:
699 return ERR_PTR(-ENOENT);
700 case -ETIMEDOUT:
701 return ERR_PTR(-ESHUTDOWN);
702 case 0:
703 gi = get_group_info(ug->gi);
704 cache_put(&ug->h, &unix_gid_cache);
705 return gi;
706 default:
707 return ERR_PTR(-EAGAIN);
708 }
709 }
710
711 int
712 svcauth_unix_set_client(struct svc_rqst *rqstp)
713 {
714 struct sockaddr_in *sin;
715 struct sockaddr_in6 *sin6, sin6_storage;
716 struct ip_map *ipm;
717 struct group_info *gi;
718 struct svc_cred *cred = &rqstp->rq_cred;
719 struct svc_xprt *xprt = rqstp->rq_xprt;
720 struct net *net = xprt->xpt_net;
721 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
722
723 switch (rqstp->rq_addr.ss_family) {
724 case AF_INET:
725 sin = svc_addr_in(rqstp);
726 sin6 = &sin6_storage;
727 ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &sin6->sin6_addr);
728 break;
729 case AF_INET6:
730 sin6 = svc_addr_in6(rqstp);
731 break;
732 default:
733 BUG();
734 }
735
736 rqstp->rq_client = NULL;
737 if (rqstp->rq_proc == 0)
738 return SVC_OK;
739
740 ipm = ip_map_cached_get(xprt);
741 if (ipm == NULL)
742 ipm = __ip_map_lookup(sn->ip_map_cache, rqstp->rq_server->sv_program->pg_class,
743 &sin6->sin6_addr);
744
745 if (ipm == NULL)
746 return SVC_DENIED;
747
748 switch (cache_check(sn->ip_map_cache, &ipm->h, &rqstp->rq_chandle)) {
749 default:
750 BUG();
751 case -ETIMEDOUT:
752 return SVC_CLOSE;
753 case -EAGAIN:
754 return SVC_DROP;
755 case -ENOENT:
756 return SVC_DENIED;
757 case 0:
758 rqstp->rq_client = &ipm->m_client->h;
759 kref_get(&rqstp->rq_client->ref);
760 ip_map_cached_put(xprt, ipm);
761 break;
762 }
763
764 gi = unix_gid_find(cred->cr_uid, rqstp);
765 switch (PTR_ERR(gi)) {
766 case -EAGAIN:
767 return SVC_DROP;
768 case -ESHUTDOWN:
769 return SVC_CLOSE;
770 case -ENOENT:
771 break;
772 default:
773 put_group_info(cred->cr_group_info);
774 cred->cr_group_info = gi;
775 }
776 return SVC_OK;
777 }
778
779 EXPORT_SYMBOL_GPL(svcauth_unix_set_client);
780
781 static int
782 svcauth_null_accept(struct svc_rqst *rqstp, __be32 *authp)
783 {
784 struct kvec *argv = &rqstp->rq_arg.head[0];
785 struct kvec *resv = &rqstp->rq_res.head[0];
786 struct svc_cred *cred = &rqstp->rq_cred;
787
788 cred->cr_group_info = NULL;
789 rqstp->rq_client = NULL;
790
791 if (argv->iov_len < 3*4)
792 return SVC_GARBAGE;
793
794 if (svc_getu32(argv) != 0) {
795 dprintk("svc: bad null cred\n");
796 *authp = rpc_autherr_badcred;
797 return SVC_DENIED;
798 }
799 if (svc_getu32(argv) != htonl(RPC_AUTH_NULL) || svc_getu32(argv) != 0) {
800 dprintk("svc: bad null verf\n");
801 *authp = rpc_autherr_badverf;
802 return SVC_DENIED;
803 }
804
805 /* Signal that mapping to nobody uid/gid is required */
806 cred->cr_uid = (uid_t) -1;
807 cred->cr_gid = (gid_t) -1;
808 cred->cr_group_info = groups_alloc(0);
809 if (cred->cr_group_info == NULL)
810 return SVC_CLOSE; /* kmalloc failure - client must retry */
811
812 /* Put NULL verifier */
813 svc_putnl(resv, RPC_AUTH_NULL);
814 svc_putnl(resv, 0);
815
816 rqstp->rq_flavor = RPC_AUTH_NULL;
817 return SVC_OK;
818 }
819
820 static int
821 svcauth_null_release(struct svc_rqst *rqstp)
822 {
823 if (rqstp->rq_client)
824 auth_domain_put(rqstp->rq_client);
825 rqstp->rq_client = NULL;
826 if (rqstp->rq_cred.cr_group_info)
827 put_group_info(rqstp->rq_cred.cr_group_info);
828 rqstp->rq_cred.cr_group_info = NULL;
829
830 return 0; /* don't drop */
831 }
832
833
834 struct auth_ops svcauth_null = {
835 .name = "null",
836 .owner = THIS_MODULE,
837 .flavour = RPC_AUTH_NULL,
838 .accept = svcauth_null_accept,
839 .release = svcauth_null_release,
840 .set_client = svcauth_unix_set_client,
841 };
842
843
844 static int
845 svcauth_unix_accept(struct svc_rqst *rqstp, __be32 *authp)
846 {
847 struct kvec *argv = &rqstp->rq_arg.head[0];
848 struct kvec *resv = &rqstp->rq_res.head[0];
849 struct svc_cred *cred = &rqstp->rq_cred;
850 u32 slen, i;
851 int len = argv->iov_len;
852
853 cred->cr_group_info = NULL;
854 rqstp->rq_client = NULL;
855
856 if ((len -= 3*4) < 0)
857 return SVC_GARBAGE;
858
859 svc_getu32(argv); /* length */
860 svc_getu32(argv); /* time stamp */
861 slen = XDR_QUADLEN(svc_getnl(argv)); /* machname length */
862 if (slen > 64 || (len -= (slen + 3)*4) < 0)
863 goto badcred;
864 argv->iov_base = (void*)((__be32*)argv->iov_base + slen); /* skip machname */
865 argv->iov_len -= slen*4;
866
867 cred->cr_uid = svc_getnl(argv); /* uid */
868 cred->cr_gid = svc_getnl(argv); /* gid */
869 slen = svc_getnl(argv); /* gids length */
870 if (slen > 16 || (len -= (slen + 2)*4) < 0)
871 goto badcred;
872 cred->cr_group_info = groups_alloc(slen);
873 if (cred->cr_group_info == NULL)
874 return SVC_CLOSE;
875 for (i = 0; i < slen; i++)
876 GROUP_AT(cred->cr_group_info, i) = svc_getnl(argv);
877 if (svc_getu32(argv) != htonl(RPC_AUTH_NULL) || svc_getu32(argv) != 0) {
878 *authp = rpc_autherr_badverf;
879 return SVC_DENIED;
880 }
881
882 /* Put NULL verifier */
883 svc_putnl(resv, RPC_AUTH_NULL);
884 svc_putnl(resv, 0);
885
886 rqstp->rq_flavor = RPC_AUTH_UNIX;
887 return SVC_OK;
888
889 badcred:
890 *authp = rpc_autherr_badcred;
891 return SVC_DENIED;
892 }
893
894 static int
895 svcauth_unix_release(struct svc_rqst *rqstp)
896 {
897 /* Verifier (such as it is) is already in place.
898 */
899 if (rqstp->rq_client)
900 auth_domain_put(rqstp->rq_client);
901 rqstp->rq_client = NULL;
902 if (rqstp->rq_cred.cr_group_info)
903 put_group_info(rqstp->rq_cred.cr_group_info);
904 rqstp->rq_cred.cr_group_info = NULL;
905
906 return 0;
907 }
908
909
910 struct auth_ops svcauth_unix = {
911 .name = "unix",
912 .owner = THIS_MODULE,
913 .flavour = RPC_AUTH_UNIX,
914 .accept = svcauth_unix_accept,
915 .release = svcauth_unix_release,
916 .domain_release = svcauth_unix_domain_release,
917 .set_client = svcauth_unix_set_client,
918 };
919
920 int ip_map_cache_create(struct net *net)
921 {
922 int err = -ENOMEM;
923 struct cache_detail *cd;
924 struct cache_head **tbl;
925 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
926
927 cd = kzalloc(sizeof(struct cache_detail), GFP_KERNEL);
928 if (cd == NULL)
929 goto err_cd;
930
931 tbl = kzalloc(IP_HASHMAX * sizeof(struct cache_head *), GFP_KERNEL);
932 if (tbl == NULL)
933 goto err_tbl;
934
935 cd->owner = THIS_MODULE,
936 cd->hash_size = IP_HASHMAX,
937 cd->hash_table = tbl,
938 cd->name = "auth.unix.ip",
939 cd->cache_put = ip_map_put,
940 cd->cache_upcall = ip_map_upcall,
941 cd->cache_parse = ip_map_parse,
942 cd->cache_show = ip_map_show,
943 cd->match = ip_map_match,
944 cd->init = ip_map_init,
945 cd->update = update,
946 cd->alloc = ip_map_alloc,
947
948 err = cache_register_net(cd, net);
949 if (err)
950 goto err_reg;
951
952 sn->ip_map_cache = cd;
953 return 0;
954
955 err_reg:
956 kfree(tbl);
957 err_tbl:
958 kfree(cd);
959 err_cd:
960 return err;
961 }
962
963 void ip_map_cache_destroy(struct net *net)
964 {
965 struct sunrpc_net *sn;
966
967 sn = net_generic(net, sunrpc_net_id);
968 cache_purge(sn->ip_map_cache);
969 cache_unregister_net(sn->ip_map_cache, net);
970 kfree(sn->ip_map_cache->hash_table);
971 kfree(sn->ip_map_cache);
972 }
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree