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sunrpc: Add net to pure API calls
[linux-2.6/btrfs-unstable.git] / net / sunrpc / svcauth_unix.c
blob2a76c7cf603ec4223f78144385676ff855a4ff0f
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 /*
22 * AUTHUNIX and AUTHNULL credentials are both handled here.
23 * AUTHNULL is treated just like AUTHUNIX except that the uid/gid
24 * are always nobody (-2). i.e. we do the same IP address checks for
25 * AUTHNULL as for AUTHUNIX, and that is done here.
26 */
27
28
29 struct unix_domain {
30 struct auth_domain h;
31 int addr_changes;
32 /* other stuff later */
33 };
34
35 extern struct auth_ops svcauth_unix;
36
37 struct auth_domain *unix_domain_find(char *name)
38 {
39 struct auth_domain *rv;
40 struct unix_domain *new = NULL;
41
42 rv = auth_domain_lookup(name, NULL);
43 while(1) {
44 if (rv) {
45 if (new && rv != &new->h)
46 auth_domain_put(&new->h);
47
48 if (rv->flavour != &svcauth_unix) {
49 auth_domain_put(rv);
50 return NULL;
51 }
52 return rv;
53 }
54
55 new = kmalloc(sizeof(*new), GFP_KERNEL);
56 if (new == NULL)
57 return NULL;
58 kref_init(&new->h.ref);
59 new->h.name = kstrdup(name, GFP_KERNEL);
60 if (new->h.name == NULL) {
61 kfree(new);
62 return NULL;
63 }
64 new->h.flavour = &svcauth_unix;
65 new->addr_changes = 0;
66 rv = auth_domain_lookup(name, &new->h);
67 }
68 }
69 EXPORT_SYMBOL_GPL(unix_domain_find);
70
71 static void svcauth_unix_domain_release(struct auth_domain *dom)
72 {
73 struct unix_domain *ud = container_of(dom, struct unix_domain, h);
74
75 kfree(dom->name);
76 kfree(ud);
77 }
78
79
80 /**************************************************
81 * cache for IP address to unix_domain
82 * as needed by AUTH_UNIX
83 */
84 #define IP_HASHBITS 8
85 #define IP_HASHMAX (1<<IP_HASHBITS)
86 #define IP_HASHMASK (IP_HASHMAX-1)
87
88 struct ip_map {
89 struct cache_head h;
90 char m_class[8]; /* e.g. "nfsd" */
91 struct in6_addr m_addr;
92 struct unix_domain *m_client;
93 int m_add_change;
94 };
95 static struct cache_head *ip_table[IP_HASHMAX];
96
97 static void ip_map_put(struct kref *kref)
98 {
99 struct cache_head *item = container_of(kref, struct cache_head, ref);
100 struct ip_map *im = container_of(item, struct ip_map,h);
101
102 if (test_bit(CACHE_VALID, &item->flags) &&
103 !test_bit(CACHE_NEGATIVE, &item->flags))
104 auth_domain_put(&im->m_client->h);
105 kfree(im);
106 }
107
108 #if IP_HASHBITS == 8
109 /* hash_long on a 64 bit machine is currently REALLY BAD for
110 * IP addresses in reverse-endian (i.e. on a little-endian machine).
111 * So use a trivial but reliable hash instead
112 */
113 static inline int hash_ip(__be32 ip)
114 {
115 int hash = (__force u32)ip ^ ((__force u32)ip>>16);
116 return (hash ^ (hash>>8)) & 0xff;
117 }
118 #endif
119 static inline int hash_ip6(struct in6_addr ip)
120 {
121 return (hash_ip(ip.s6_addr32[0]) ^
122 hash_ip(ip.s6_addr32[1]) ^
123 hash_ip(ip.s6_addr32[2]) ^
124 hash_ip(ip.s6_addr32[3]));
125 }
126 static int ip_map_match(struct cache_head *corig, struct cache_head *cnew)
127 {
128 struct ip_map *orig = container_of(corig, struct ip_map, h);
129 struct ip_map *new = container_of(cnew, struct ip_map, h);
130 return strcmp(orig->m_class, new->m_class) == 0 &&
131 ipv6_addr_equal(&orig->m_addr, &new->m_addr);
132 }
133 static void ip_map_init(struct cache_head *cnew, struct cache_head *citem)
134 {
135 struct ip_map *new = container_of(cnew, struct ip_map, h);
136 struct ip_map *item = container_of(citem, struct ip_map, h);
137
138 strcpy(new->m_class, item->m_class);
139 ipv6_addr_copy(&new->m_addr, &item->m_addr);
140 }
141 static void update(struct cache_head *cnew, struct cache_head *citem)
142 {
143 struct ip_map *new = container_of(cnew, struct ip_map, h);
144 struct ip_map *item = container_of(citem, struct ip_map, h);
145
146 kref_get(&item->m_client->h.ref);
147 new->m_client = item->m_client;
148 new->m_add_change = item->m_add_change;
149 }
150 static struct cache_head *ip_map_alloc(void)
151 {
152 struct ip_map *i = kmalloc(sizeof(*i), GFP_KERNEL);
153 if (i)
154 return &i->h;
155 else
156 return NULL;
157 }
158
159 static void ip_map_request(struct cache_detail *cd,
160 struct cache_head *h,
161 char **bpp, int *blen)
162 {
163 char text_addr[40];
164 struct ip_map *im = container_of(h, struct ip_map, h);
165
166 if (ipv6_addr_v4mapped(&(im->m_addr))) {
167 snprintf(text_addr, 20, "%pI4", &im->m_addr.s6_addr32[3]);
168 } else {
169 snprintf(text_addr, 40, "%pI6", &im->m_addr);
170 }
171 qword_add(bpp, blen, im->m_class);
172 qword_add(bpp, blen, text_addr);
173 (*bpp)[-1] = '\n';
174 }
175
176 static int ip_map_upcall(struct cache_detail *cd, struct cache_head *h)
177 {
178 return sunrpc_cache_pipe_upcall(cd, h, ip_map_request);
179 }
180
181 static struct ip_map *__ip_map_lookup(struct cache_detail *cd, char *class, struct in6_addr *addr);
182 static int __ip_map_update(struct cache_detail *cd, struct ip_map *ipm, struct unix_domain *udom, time_t expiry);
183
184 static int ip_map_parse(struct cache_detail *cd,
185 char *mesg, int mlen)
186 {
187 /* class ipaddress [domainname] */
188 /* should be safe just to use the start of the input buffer
189 * for scratch: */
190 char *buf = mesg;
191 int len;
192 char class[8];
193 union {
194 struct sockaddr sa;
195 struct sockaddr_in s4;
196 struct sockaddr_in6 s6;
197 } address;
198 struct sockaddr_in6 sin6;
199 int err;
200
201 struct ip_map *ipmp;
202 struct auth_domain *dom;
203 time_t expiry;
204
205 if (mesg[mlen-1] != '\n')
206 return -EINVAL;
207 mesg[mlen-1] = 0;
208
209 /* class */
210 len = qword_get(&mesg, class, sizeof(class));
211 if (len <= 0) return -EINVAL;
212
213 /* ip address */
214 len = qword_get(&mesg, buf, mlen);
215 if (len <= 0) return -EINVAL;
216
217 if (rpc_pton(buf, len, &address.sa, sizeof(address)) == 0)
218 return -EINVAL;
219 switch (address.sa.sa_family) {
220 case AF_INET:
221 /* Form a mapped IPv4 address in sin6 */
222 memset(&sin6, 0, sizeof(sin6));
223 sin6.sin6_family = AF_INET6;
224 sin6.sin6_addr.s6_addr32[2] = htonl(0xffff);
225 sin6.sin6_addr.s6_addr32[3] = address.s4.sin_addr.s_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 struct cache_detail ip_map_cache = {
298 .owner = THIS_MODULE,
299 .hash_size = IP_HASHMAX,
300 .hash_table = ip_table,
301 .name = "auth.unix.ip",
302 .cache_put = ip_map_put,
303 .cache_upcall = ip_map_upcall,
304 .cache_parse = ip_map_parse,
305 .cache_show = ip_map_show,
306 .match = ip_map_match,
307 .init = ip_map_init,
308 .update = update,
309 .alloc = ip_map_alloc,
310 };
311
312 static struct ip_map *__ip_map_lookup(struct cache_detail *cd, char *class,
313 struct in6_addr *addr)
314 {
315 struct ip_map ip;
316 struct cache_head *ch;
317
318 strcpy(ip.m_class, class);
319 ipv6_addr_copy(&ip.m_addr, addr);
320 ch = sunrpc_cache_lookup(cd, &ip.h,
321 hash_str(class, IP_HASHBITS) ^
322 hash_ip6(*addr));
323
324 if (ch)
325 return container_of(ch, struct ip_map, h);
326 else
327 return NULL;
328 }
329
330 static inline struct ip_map *ip_map_lookup(struct net *net, char *class,
331 struct in6_addr *addr)
332 {
333 return __ip_map_lookup(&ip_map_cache, class, addr);
334 }
335
336 static int __ip_map_update(struct cache_detail *cd, struct ip_map *ipm,
337 struct unix_domain *udom, time_t expiry)
338 {
339 struct ip_map ip;
340 struct cache_head *ch;
341
342 ip.m_client = udom;
343 ip.h.flags = 0;
344 if (!udom)
345 set_bit(CACHE_NEGATIVE, &ip.h.flags);
346 else {
347 ip.m_add_change = udom->addr_changes;
348 /* if this is from the legacy set_client system call,
349 * we need m_add_change to be one higher
350 */
351 if (expiry == NEVER)
352 ip.m_add_change++;
353 }
354 ip.h.expiry_time = expiry;
355 ch = sunrpc_cache_update(cd, &ip.h, &ipm->h,
356 hash_str(ipm->m_class, IP_HASHBITS) ^
357 hash_ip6(ipm->m_addr));
358 if (!ch)
359 return -ENOMEM;
360 cache_put(ch, cd);
361 return 0;
362 }
363
364 static inline int ip_map_update(struct net *net, struct ip_map *ipm,
365 struct unix_domain *udom, time_t expiry)
366 {
367 return __ip_map_update(&ip_map_cache, ipm, udom, expiry);
368 }
369
370 int auth_unix_add_addr(struct net *net, struct in6_addr *addr, struct auth_domain *dom)
371 {
372 struct unix_domain *udom;
373 struct ip_map *ipmp;
374
375 if (dom->flavour != &svcauth_unix)
376 return -EINVAL;
377 udom = container_of(dom, struct unix_domain, h);
378 ipmp = ip_map_lookup(net, "nfsd", addr);
379
380 if (ipmp)
381 return ip_map_update(net, ipmp, udom, NEVER);
382 else
383 return -ENOMEM;
384 }
385 EXPORT_SYMBOL_GPL(auth_unix_add_addr);
386
387 int auth_unix_forget_old(struct auth_domain *dom)
388 {
389 struct unix_domain *udom;
390
391 if (dom->flavour != &svcauth_unix)
392 return -EINVAL;
393 udom = container_of(dom, struct unix_domain, h);
394 udom->addr_changes++;
395 return 0;
396 }
397 EXPORT_SYMBOL_GPL(auth_unix_forget_old);
398
399 struct auth_domain *auth_unix_lookup(struct net *net, struct in6_addr *addr)
400 {
401 struct ip_map *ipm;
402 struct auth_domain *rv;
403
404 ipm = ip_map_lookup(net, "nfsd", addr);
405
406 if (!ipm)
407 return NULL;
408 if (cache_check(&ip_map_cache, &ipm->h, NULL))
409 return NULL;
410
411 if ((ipm->m_client->addr_changes - ipm->m_add_change) >0) {
412 if (test_and_set_bit(CACHE_NEGATIVE, &ipm->h.flags) == 0)
413 auth_domain_put(&ipm->m_client->h);
414 rv = NULL;
415 } else {
416 rv = &ipm->m_client->h;
417 kref_get(&rv->ref);
418 }
419 cache_put(&ipm->h, &ip_map_cache);
420 return rv;
421 }
422 EXPORT_SYMBOL_GPL(auth_unix_lookup);
423
424 void svcauth_unix_purge(void)
425 {
426 cache_purge(&ip_map_cache);
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
435 if (test_bit(XPT_CACHE_AUTH, &xprt->xpt_flags)) {
436 spin_lock(&xprt->xpt_lock);
437 ipm = xprt->xpt_auth_cache;
438 if (ipm != NULL) {
439 if (!cache_valid(&ipm->h)) {
440 /*
441 * The entry has been invalidated since it was
442 * remembered, e.g. by a second mount from the
443 * same IP address.
444 */
445 xprt->xpt_auth_cache = NULL;
446 spin_unlock(&xprt->xpt_lock);
447 cache_put(&ipm->h, &ip_map_cache);
448 return NULL;
449 }
450 cache_get(&ipm->h);
451 }
452 spin_unlock(&xprt->xpt_lock);
453 }
454 return ipm;
455 }
456
457 static inline void
458 ip_map_cached_put(struct svc_xprt *xprt, struct ip_map *ipm)
459 {
460 if (test_bit(XPT_CACHE_AUTH, &xprt->xpt_flags)) {
461 spin_lock(&xprt->xpt_lock);
462 if (xprt->xpt_auth_cache == NULL) {
463 /* newly cached, keep the reference */
464 xprt->xpt_auth_cache = ipm;
465 ipm = NULL;
466 }
467 spin_unlock(&xprt->xpt_lock);
468 }
469 if (ipm)
470 cache_put(&ipm->h, &ip_map_cache);
471 }
472
473 void
474 svcauth_unix_info_release(struct svc_xprt *xpt)
475 {
476 struct ip_map *ipm;
477
478 ipm = xpt->xpt_auth_cache;
479 if (ipm != NULL)
480 cache_put(&ipm->h, &ip_map_cache);
481 }
482
483 /****************************************************************************
484 * auth.unix.gid cache
485 * simple cache to map a UID to a list of GIDs
486 * because AUTH_UNIX aka AUTH_SYS has a max of 16
487 */
488 #define GID_HASHBITS 8
489 #define GID_HASHMAX (1<<GID_HASHBITS)
490 #define GID_HASHMASK (GID_HASHMAX - 1)
491
492 struct unix_gid {
493 struct cache_head h;
494 uid_t uid;
495 struct group_info *gi;
496 };
497 static struct cache_head *gid_table[GID_HASHMAX];
498
499 static void unix_gid_put(struct kref *kref)
500 {
501 struct cache_head *item = container_of(kref, struct cache_head, ref);
502 struct unix_gid *ug = container_of(item, struct unix_gid, h);
503 if (test_bit(CACHE_VALID, &item->flags) &&
504 !test_bit(CACHE_NEGATIVE, &item->flags))
505 put_group_info(ug->gi);
506 kfree(ug);
507 }
508
509 static int unix_gid_match(struct cache_head *corig, struct cache_head *cnew)
510 {
511 struct unix_gid *orig = container_of(corig, struct unix_gid, h);
512 struct unix_gid *new = container_of(cnew, struct unix_gid, h);
513 return orig->uid == new->uid;
514 }
515 static void unix_gid_init(struct cache_head *cnew, struct cache_head *citem)
516 {
517 struct unix_gid *new = container_of(cnew, struct unix_gid, h);
518 struct unix_gid *item = container_of(citem, struct unix_gid, h);
519 new->uid = item->uid;
520 }
521 static void unix_gid_update(struct cache_head *cnew, struct cache_head *citem)
522 {
523 struct unix_gid *new = container_of(cnew, struct unix_gid, h);
524 struct unix_gid *item = container_of(citem, struct unix_gid, h);
525
526 get_group_info(item->gi);
527 new->gi = item->gi;
528 }
529 static struct cache_head *unix_gid_alloc(void)
530 {
531 struct unix_gid *g = kmalloc(sizeof(*g), GFP_KERNEL);
532 if (g)
533 return &g->h;
534 else
535 return NULL;
536 }
537
538 static void unix_gid_request(struct cache_detail *cd,
539 struct cache_head *h,
540 char **bpp, int *blen)
541 {
542 char tuid[20];
543 struct unix_gid *ug = container_of(h, struct unix_gid, h);
544
545 snprintf(tuid, 20, "%u", ug->uid);
546 qword_add(bpp, blen, tuid);
547 (*bpp)[-1] = '\n';
548 }
549
550 static int unix_gid_upcall(struct cache_detail *cd, struct cache_head *h)
551 {
552 return sunrpc_cache_pipe_upcall(cd, h, unix_gid_request);
553 }
554
555 static struct unix_gid *unix_gid_lookup(uid_t uid);
556 extern struct cache_detail unix_gid_cache;
557
558 static int unix_gid_parse(struct cache_detail *cd,
559 char *mesg, int mlen)
560 {
561 /* uid expiry Ngid gid0 gid1 ... gidN-1 */
562 int uid;
563 int gids;
564 int rv;
565 int i;
566 int err;
567 time_t expiry;
568 struct unix_gid ug, *ugp;
569
570 if (mlen <= 0 || mesg[mlen-1] != '\n')
571 return -EINVAL;
572 mesg[mlen-1] = 0;
573
574 rv = get_int(&mesg, &uid);
575 if (rv)
576 return -EINVAL;
577 ug.uid = uid;
578
579 expiry = get_expiry(&mesg);
580 if (expiry == 0)
581 return -EINVAL;
582
583 rv = get_int(&mesg, &gids);
584 if (rv || gids < 0 || gids > 8192)
585 return -EINVAL;
586
587 ug.gi = groups_alloc(gids);
588 if (!ug.gi)
589 return -ENOMEM;
590
591 for (i = 0 ; i < gids ; i++) {
592 int gid;
593 rv = get_int(&mesg, &gid);
594 err = -EINVAL;
595 if (rv)
596 goto out;
597 GROUP_AT(ug.gi, i) = gid;
598 }
599
600 ugp = unix_gid_lookup(uid);
601 if (ugp) {
602 struct cache_head *ch;
603 ug.h.flags = 0;
604 ug.h.expiry_time = expiry;
605 ch = sunrpc_cache_update(&unix_gid_cache,
606 &ug.h, &ugp->h,
607 hash_long(uid, GID_HASHBITS));
608 if (!ch)
609 err = -ENOMEM;
610 else {
611 err = 0;
612 cache_put(ch, &unix_gid_cache);
613 }
614 } else
615 err = -ENOMEM;
616 out:
617 if (ug.gi)
618 put_group_info(ug.gi);
619 return err;
620 }
621
622 static int unix_gid_show(struct seq_file *m,
623 struct cache_detail *cd,
624 struct cache_head *h)
625 {
626 struct unix_gid *ug;
627 int i;
628 int glen;
629
630 if (h == NULL) {
631 seq_puts(m, "#uid cnt: gids...\n");
632 return 0;
633 }
634 ug = container_of(h, struct unix_gid, h);
635 if (test_bit(CACHE_VALID, &h->flags) &&
636 !test_bit(CACHE_NEGATIVE, &h->flags))
637 glen = ug->gi->ngroups;
638 else
639 glen = 0;
640
641 seq_printf(m, "%u %d:", ug->uid, glen);
642 for (i = 0; i < glen; i++)
643 seq_printf(m, " %d", GROUP_AT(ug->gi, i));
644 seq_printf(m, "\n");
645 return 0;
646 }
647
648 struct cache_detail unix_gid_cache = {
649 .owner = THIS_MODULE,
650 .hash_size = GID_HASHMAX,
651 .hash_table = gid_table,
652 .name = "auth.unix.gid",
653 .cache_put = unix_gid_put,
654 .cache_upcall = unix_gid_upcall,
655 .cache_parse = unix_gid_parse,
656 .cache_show = unix_gid_show,
657 .match = unix_gid_match,
658 .init = unix_gid_init,
659 .update = unix_gid_update,
660 .alloc = unix_gid_alloc,
661 };
662
663 static struct unix_gid *unix_gid_lookup(uid_t uid)
664 {
665 struct unix_gid ug;
666 struct cache_head *ch;
667
668 ug.uid = uid;
669 ch = sunrpc_cache_lookup(&unix_gid_cache, &ug.h,
670 hash_long(uid, GID_HASHBITS));
671 if (ch)
672 return container_of(ch, struct unix_gid, h);
673 else
674 return NULL;
675 }
676
677 static struct group_info *unix_gid_find(uid_t uid, struct svc_rqst *rqstp)
678 {
679 struct unix_gid *ug;
680 struct group_info *gi;
681 int ret;
682
683 ug = unix_gid_lookup(uid);
684 if (!ug)
685 return ERR_PTR(-EAGAIN);
686 ret = cache_check(&unix_gid_cache, &ug->h, &rqstp->rq_chandle);
687 switch (ret) {
688 case -ENOENT:
689 return ERR_PTR(-ENOENT);
690 case -ETIMEDOUT:
691 return ERR_PTR(-ESHUTDOWN);
692 case 0:
693 gi = get_group_info(ug->gi);
694 cache_put(&ug->h, &unix_gid_cache);
695 return gi;
696 default:
697 return ERR_PTR(-EAGAIN);
698 }
699 }
700
701 int
702 svcauth_unix_set_client(struct svc_rqst *rqstp)
703 {
704 struct sockaddr_in *sin;
705 struct sockaddr_in6 *sin6, sin6_storage;
706 struct ip_map *ipm;
707 struct group_info *gi;
708 struct svc_cred *cred = &rqstp->rq_cred;
709 struct svc_xprt *xprt = rqstp->rq_xprt;
710
711 switch (rqstp->rq_addr.ss_family) {
712 case AF_INET:
713 sin = svc_addr_in(rqstp);
714 sin6 = &sin6_storage;
715 ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &sin6->sin6_addr);
716 break;
717 case AF_INET6:
718 sin6 = svc_addr_in6(rqstp);
719 break;
720 default:
721 BUG();
722 }
723
724 rqstp->rq_client = NULL;
725 if (rqstp->rq_proc == 0)
726 return SVC_OK;
727
728 ipm = ip_map_cached_get(xprt);
729 if (ipm == NULL)
730 ipm = ip_map_lookup(&init_net, rqstp->rq_server->sv_program->pg_class,
731 &sin6->sin6_addr);
732
733 if (ipm == NULL)
734 return SVC_DENIED;
735
736 switch (cache_check(&ip_map_cache, &ipm->h, &rqstp->rq_chandle)) {
737 default:
738 BUG();
739 case -ETIMEDOUT:
740 return SVC_CLOSE;
741 case -EAGAIN:
742 return SVC_DROP;
743 case -ENOENT:
744 return SVC_DENIED;
745 case 0:
746 rqstp->rq_client = &ipm->m_client->h;
747 kref_get(&rqstp->rq_client->ref);
748 ip_map_cached_put(xprt, ipm);
749 break;
750 }
751
752 gi = unix_gid_find(cred->cr_uid, rqstp);
753 switch (PTR_ERR(gi)) {
754 case -EAGAIN:
755 return SVC_DROP;
756 case -ESHUTDOWN:
757 return SVC_CLOSE;
758 case -ENOENT:
759 break;
760 default:
761 put_group_info(cred->cr_group_info);
762 cred->cr_group_info = gi;
763 }
764 return SVC_OK;
765 }
766
767 EXPORT_SYMBOL_GPL(svcauth_unix_set_client);
768
769 static int
770 svcauth_null_accept(struct svc_rqst *rqstp, __be32 *authp)
771 {
772 struct kvec *argv = &rqstp->rq_arg.head[0];
773 struct kvec *resv = &rqstp->rq_res.head[0];
774 struct svc_cred *cred = &rqstp->rq_cred;
775
776 cred->cr_group_info = NULL;
777 rqstp->rq_client = NULL;
778
779 if (argv->iov_len < 3*4)
780 return SVC_GARBAGE;
781
782 if (svc_getu32(argv) != 0) {
783 dprintk("svc: bad null cred\n");
784 *authp = rpc_autherr_badcred;
785 return SVC_DENIED;
786 }
787 if (svc_getu32(argv) != htonl(RPC_AUTH_NULL) || svc_getu32(argv) != 0) {
788 dprintk("svc: bad null verf\n");
789 *authp = rpc_autherr_badverf;
790 return SVC_DENIED;
791 }
792
793 /* Signal that mapping to nobody uid/gid is required */
794 cred->cr_uid = (uid_t) -1;
795 cred->cr_gid = (gid_t) -1;
796 cred->cr_group_info = groups_alloc(0);
797 if (cred->cr_group_info == NULL)
798 return SVC_CLOSE; /* kmalloc failure - client must retry */
799
800 /* Put NULL verifier */
801 svc_putnl(resv, RPC_AUTH_NULL);
802 svc_putnl(resv, 0);
803
804 rqstp->rq_flavor = RPC_AUTH_NULL;
805 return SVC_OK;
806 }
807
808 static int
809 svcauth_null_release(struct svc_rqst *rqstp)
810 {
811 if (rqstp->rq_client)
812 auth_domain_put(rqstp->rq_client);
813 rqstp->rq_client = NULL;
814 if (rqstp->rq_cred.cr_group_info)
815 put_group_info(rqstp->rq_cred.cr_group_info);
816 rqstp->rq_cred.cr_group_info = NULL;
817
818 return 0; /* don't drop */
819 }
820
821
822 struct auth_ops svcauth_null = {
823 .name = "null",
824 .owner = THIS_MODULE,
825 .flavour = RPC_AUTH_NULL,
826 .accept = svcauth_null_accept,
827 .release = svcauth_null_release,
828 .set_client = svcauth_unix_set_client,
829 };
830
831
832 static int
833 svcauth_unix_accept(struct svc_rqst *rqstp, __be32 *authp)
834 {
835 struct kvec *argv = &rqstp->rq_arg.head[0];
836 struct kvec *resv = &rqstp->rq_res.head[0];
837 struct svc_cred *cred = &rqstp->rq_cred;
838 u32 slen, i;
839 int len = argv->iov_len;
840
841 cred->cr_group_info = NULL;
842 rqstp->rq_client = NULL;
843
844 if ((len -= 3*4) < 0)
845 return SVC_GARBAGE;
846
847 svc_getu32(argv); /* length */
848 svc_getu32(argv); /* time stamp */
849 slen = XDR_QUADLEN(svc_getnl(argv)); /* machname length */
850 if (slen > 64 || (len -= (slen + 3)*4) < 0)
851 goto badcred;
852 argv->iov_base = (void*)((__be32*)argv->iov_base + slen); /* skip machname */
853 argv->iov_len -= slen*4;
854
855 cred->cr_uid = svc_getnl(argv); /* uid */
856 cred->cr_gid = svc_getnl(argv); /* gid */
857 slen = svc_getnl(argv); /* gids length */
858 if (slen > 16 || (len -= (slen + 2)*4) < 0)
859 goto badcred;
860 cred->cr_group_info = groups_alloc(slen);
861 if (cred->cr_group_info == NULL)
862 return SVC_CLOSE;
863 for (i = 0; i < slen; i++)
864 GROUP_AT(cred->cr_group_info, i) = svc_getnl(argv);
865 if (svc_getu32(argv) != htonl(RPC_AUTH_NULL) || svc_getu32(argv) != 0) {
866 *authp = rpc_autherr_badverf;
867 return SVC_DENIED;
868 }
869
870 /* Put NULL verifier */
871 svc_putnl(resv, RPC_AUTH_NULL);
872 svc_putnl(resv, 0);
873
874 rqstp->rq_flavor = RPC_AUTH_UNIX;
875 return SVC_OK;
876
877 badcred:
878 *authp = rpc_autherr_badcred;
879 return SVC_DENIED;
880 }
881
882 static int
883 svcauth_unix_release(struct svc_rqst *rqstp)
884 {
885 /* Verifier (such as it is) is already in place.
886 */
887 if (rqstp->rq_client)
888 auth_domain_put(rqstp->rq_client);
889 rqstp->rq_client = NULL;
890 if (rqstp->rq_cred.cr_group_info)
891 put_group_info(rqstp->rq_cred.cr_group_info);
892 rqstp->rq_cred.cr_group_info = NULL;
893
894 return 0;
895 }
896
897
898 struct auth_ops svcauth_unix = {
899 .name = "unix",
900 .owner = THIS_MODULE,
901 .flavour = RPC_AUTH_UNIX,
902 .accept = svcauth_unix_accept,
903 .release = svcauth_unix_release,
904 .domain_release = svcauth_unix_domain_release,
905 .set_client = svcauth_unix_set_client,
906 };
907
(deprecated) Btrfs devel tree