net: Move && and || to end of previous line
[linux-2.6.git] / net / sunrpc / svcauth_unix.c
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 <net/sock.h>
14 #include <net/ipv6.h>
15 #include <linux/kernel.h>
16 #define RPCDBG_FACILITY RPCDBG_AUTH
17
18
19 /*
20  * AUTHUNIX and AUTHNULL credentials are both handled here.
21  * AUTHNULL is treated just like AUTHUNIX except that the uid/gid
22  * are always nobody (-2).  i.e. we do the same IP address checks for
23  * AUTHNULL as for AUTHUNIX, and that is done here.
24  */
25
26
27 struct unix_domain {
28         struct auth_domain      h;
29         int     addr_changes;
30         /* other stuff later */
31 };
32
33 extern struct auth_ops svcauth_unix;
34
35 struct auth_domain *unix_domain_find(char *name)
36 {
37         struct auth_domain *rv;
38         struct unix_domain *new = NULL;
39
40         rv = auth_domain_lookup(name, NULL);
41         while(1) {
42                 if (rv) {
43                         if (new && rv != &new->h)
44                                 auth_domain_put(&new->h);
45
46                         if (rv->flavour != &svcauth_unix) {
47                                 auth_domain_put(rv);
48                                 return NULL;
49                         }
50                         return rv;
51                 }
52
53                 new = kmalloc(sizeof(*new), GFP_KERNEL);
54                 if (new == NULL)
55                         return NULL;
56                 kref_init(&new->h.ref);
57                 new->h.name = kstrdup(name, GFP_KERNEL);
58                 if (new->h.name == NULL) {
59                         kfree(new);
60                         return NULL;
61                 }
62                 new->h.flavour = &svcauth_unix;
63                 new->addr_changes = 0;
64                 rv = auth_domain_lookup(name, &new->h);
65         }
66 }
67 EXPORT_SYMBOL_GPL(unix_domain_find);
68
69 static void svcauth_unix_domain_release(struct auth_domain *dom)
70 {
71         struct unix_domain *ud = container_of(dom, struct unix_domain, h);
72
73         kfree(dom->name);
74         kfree(ud);
75 }
76
77
78 /**************************************************
79  * cache for IP address to unix_domain
80  * as needed by AUTH_UNIX
81  */
82 #define IP_HASHBITS     8
83 #define IP_HASHMAX      (1<<IP_HASHBITS)
84 #define IP_HASHMASK     (IP_HASHMAX-1)
85
86 struct ip_map {
87         struct cache_head       h;
88         char                    m_class[8]; /* e.g. "nfsd" */
89         struct in6_addr         m_addr;
90         struct unix_domain      *m_client;
91         int                     m_add_change;
92 };
93 static struct cache_head        *ip_table[IP_HASHMAX];
94
95 static void ip_map_put(struct kref *kref)
96 {
97         struct cache_head *item = container_of(kref, struct cache_head, ref);
98         struct ip_map *im = container_of(item, struct ip_map,h);
99
100         if (test_bit(CACHE_VALID, &item->flags) &&
101             !test_bit(CACHE_NEGATIVE, &item->flags))
102                 auth_domain_put(&im->m_client->h);
103         kfree(im);
104 }
105
106 #if IP_HASHBITS == 8
107 /* hash_long on a 64 bit machine is currently REALLY BAD for
108  * IP addresses in reverse-endian (i.e. on a little-endian machine).
109  * So use a trivial but reliable hash instead
110  */
111 static inline int hash_ip(__be32 ip)
112 {
113         int hash = (__force u32)ip ^ ((__force u32)ip>>16);
114         return (hash ^ (hash>>8)) & 0xff;
115 }
116 #endif
117 static inline int hash_ip6(struct in6_addr ip)
118 {
119         return (hash_ip(ip.s6_addr32[0]) ^
120                 hash_ip(ip.s6_addr32[1]) ^
121                 hash_ip(ip.s6_addr32[2]) ^
122                 hash_ip(ip.s6_addr32[3]));
123 }
124 static int ip_map_match(struct cache_head *corig, struct cache_head *cnew)
125 {
126         struct ip_map *orig = container_of(corig, struct ip_map, h);
127         struct ip_map *new = container_of(cnew, struct ip_map, h);
128         return strcmp(orig->m_class, new->m_class) == 0 &&
129                ipv6_addr_equal(&orig->m_addr, &new->m_addr);
130 }
131 static void ip_map_init(struct cache_head *cnew, struct cache_head *citem)
132 {
133         struct ip_map *new = container_of(cnew, struct ip_map, h);
134         struct ip_map *item = container_of(citem, struct ip_map, h);
135
136         strcpy(new->m_class, item->m_class);
137         ipv6_addr_copy(&new->m_addr, &item->m_addr);
138 }
139 static void update(struct cache_head *cnew, struct cache_head *citem)
140 {
141         struct ip_map *new = container_of(cnew, struct ip_map, h);
142         struct ip_map *item = container_of(citem, struct ip_map, h);
143
144         kref_get(&item->m_client->h.ref);
145         new->m_client = item->m_client;
146         new->m_add_change = item->m_add_change;
147 }
148 static struct cache_head *ip_map_alloc(void)
149 {
150         struct ip_map *i = kmalloc(sizeof(*i), GFP_KERNEL);
151         if (i)
152                 return &i->h;
153         else
154                 return NULL;
155 }
156
157 static void ip_map_request(struct cache_detail *cd,
158                                   struct cache_head *h,
159                                   char **bpp, int *blen)
160 {
161         char text_addr[40];
162         struct ip_map *im = container_of(h, struct ip_map, h);
163
164         if (ipv6_addr_v4mapped(&(im->m_addr))) {
165                 snprintf(text_addr, 20, "%pI4", &im->m_addr.s6_addr32[3]);
166         } else {
167                 snprintf(text_addr, 40, "%pI6", &im->m_addr);
168         }
169         qword_add(bpp, blen, im->m_class);
170         qword_add(bpp, blen, text_addr);
171         (*bpp)[-1] = '\n';
172 }
173
174 static int ip_map_upcall(struct cache_detail *cd, struct cache_head *h)
175 {
176         return sunrpc_cache_pipe_upcall(cd, h, ip_map_request);
177 }
178
179 static struct ip_map *ip_map_lookup(char *class, struct in6_addr *addr);
180 static int ip_map_update(struct ip_map *ipm, struct unix_domain *udom, time_t expiry);
181
182 static int ip_map_parse(struct cache_detail *cd,
183                           char *mesg, int mlen)
184 {
185         /* class ipaddress [domainname] */
186         /* should be safe just to use the start of the input buffer
187          * for scratch: */
188         char *buf = mesg;
189         int len;
190         int b1, b2, b3, b4, b5, b6, b7, b8;
191         char c;
192         char class[8];
193         struct in6_addr addr;
194         int err;
195
196         struct ip_map *ipmp;
197         struct auth_domain *dom;
198         time_t expiry;
199
200         if (mesg[mlen-1] != '\n')
201                 return -EINVAL;
202         mesg[mlen-1] = 0;
203
204         /* class */
205         len = qword_get(&mesg, class, sizeof(class));
206         if (len <= 0) return -EINVAL;
207
208         /* ip address */
209         len = qword_get(&mesg, buf, mlen);
210         if (len <= 0) return -EINVAL;
211
212         if (sscanf(buf, "%u.%u.%u.%u%c", &b1, &b2, &b3, &b4, &c) == 4) {
213                 addr.s6_addr32[0] = 0;
214                 addr.s6_addr32[1] = 0;
215                 addr.s6_addr32[2] = htonl(0xffff);
216                 addr.s6_addr32[3] =
217                         htonl((((((b1<<8)|b2)<<8)|b3)<<8)|b4);
218        } else if (sscanf(buf, "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x%c",
219                         &b1, &b2, &b3, &b4, &b5, &b6, &b7, &b8, &c) == 8) {
220                 addr.s6_addr16[0] = htons(b1);
221                 addr.s6_addr16[1] = htons(b2);
222                 addr.s6_addr16[2] = htons(b3);
223                 addr.s6_addr16[3] = htons(b4);
224                 addr.s6_addr16[4] = htons(b5);
225                 addr.s6_addr16[5] = htons(b6);
226                 addr.s6_addr16[6] = htons(b7);
227                 addr.s6_addr16[7] = htons(b8);
228        } else
229                 return -EINVAL;
230
231         expiry = get_expiry(&mesg);
232         if (expiry ==0)
233                 return -EINVAL;
234
235         /* domainname, or empty for NEGATIVE */
236         len = qword_get(&mesg, buf, mlen);
237         if (len < 0) return -EINVAL;
238
239         if (len) {
240                 dom = unix_domain_find(buf);
241                 if (dom == NULL)
242                         return -ENOENT;
243         } else
244                 dom = NULL;
245
246         ipmp = ip_map_lookup(class, &addr);
247         if (ipmp) {
248                 err = ip_map_update(ipmp,
249                              container_of(dom, struct unix_domain, h),
250                              expiry);
251         } else
252                 err = -ENOMEM;
253
254         if (dom)
255                 auth_domain_put(dom);
256
257         cache_flush();
258         return err;
259 }
260
261 static int ip_map_show(struct seq_file *m,
262                        struct cache_detail *cd,
263                        struct cache_head *h)
264 {
265         struct ip_map *im;
266         struct in6_addr addr;
267         char *dom = "-no-domain-";
268
269         if (h == NULL) {
270                 seq_puts(m, "#class IP domain\n");
271                 return 0;
272         }
273         im = container_of(h, struct ip_map, h);
274         /* class addr domain */
275         ipv6_addr_copy(&addr, &im->m_addr);
276
277         if (test_bit(CACHE_VALID, &h->flags) &&
278             !test_bit(CACHE_NEGATIVE, &h->flags))
279                 dom = im->m_client->h.name;
280
281         if (ipv6_addr_v4mapped(&addr)) {
282                 seq_printf(m, "%s %pI4 %s\n",
283                         im->m_class, &addr.s6_addr32[3], dom);
284         } else {
285                 seq_printf(m, "%s %pI6 %s\n", im->m_class, &addr, dom);
286         }
287         return 0;
288 }
289
290
291 struct cache_detail ip_map_cache = {
292         .owner          = THIS_MODULE,
293         .hash_size      = IP_HASHMAX,
294         .hash_table     = ip_table,
295         .name           = "auth.unix.ip",
296         .cache_put      = ip_map_put,
297         .cache_upcall   = ip_map_upcall,
298         .cache_parse    = ip_map_parse,
299         .cache_show     = ip_map_show,
300         .match          = ip_map_match,
301         .init           = ip_map_init,
302         .update         = update,
303         .alloc          = ip_map_alloc,
304 };
305
306 static struct ip_map *ip_map_lookup(char *class, struct in6_addr *addr)
307 {
308         struct ip_map ip;
309         struct cache_head *ch;
310
311         strcpy(ip.m_class, class);
312         ipv6_addr_copy(&ip.m_addr, addr);
313         ch = sunrpc_cache_lookup(&ip_map_cache, &ip.h,
314                                  hash_str(class, IP_HASHBITS) ^
315                                  hash_ip6(*addr));
316
317         if (ch)
318                 return container_of(ch, struct ip_map, h);
319         else
320                 return NULL;
321 }
322
323 static int ip_map_update(struct ip_map *ipm, struct unix_domain *udom, time_t expiry)
324 {
325         struct ip_map ip;
326         struct cache_head *ch;
327
328         ip.m_client = udom;
329         ip.h.flags = 0;
330         if (!udom)
331                 set_bit(CACHE_NEGATIVE, &ip.h.flags);
332         else {
333                 ip.m_add_change = udom->addr_changes;
334                 /* if this is from the legacy set_client system call,
335                  * we need m_add_change to be one higher
336                  */
337                 if (expiry == NEVER)
338                         ip.m_add_change++;
339         }
340         ip.h.expiry_time = expiry;
341         ch = sunrpc_cache_update(&ip_map_cache,
342                                  &ip.h, &ipm->h,
343                                  hash_str(ipm->m_class, IP_HASHBITS) ^
344                                  hash_ip6(ipm->m_addr));
345         if (!ch)
346                 return -ENOMEM;
347         cache_put(ch, &ip_map_cache);
348         return 0;
349 }
350
351 int auth_unix_add_addr(struct in6_addr *addr, struct auth_domain *dom)
352 {
353         struct unix_domain *udom;
354         struct ip_map *ipmp;
355
356         if (dom->flavour != &svcauth_unix)
357                 return -EINVAL;
358         udom = container_of(dom, struct unix_domain, h);
359         ipmp = ip_map_lookup("nfsd", addr);
360
361         if (ipmp)
362                 return ip_map_update(ipmp, udom, NEVER);
363         else
364                 return -ENOMEM;
365 }
366 EXPORT_SYMBOL_GPL(auth_unix_add_addr);
367
368 int auth_unix_forget_old(struct auth_domain *dom)
369 {
370         struct unix_domain *udom;
371
372         if (dom->flavour != &svcauth_unix)
373                 return -EINVAL;
374         udom = container_of(dom, struct unix_domain, h);
375         udom->addr_changes++;
376         return 0;
377 }
378 EXPORT_SYMBOL_GPL(auth_unix_forget_old);
379
380 struct auth_domain *auth_unix_lookup(struct in6_addr *addr)
381 {
382         struct ip_map *ipm;
383         struct auth_domain *rv;
384
385         ipm = ip_map_lookup("nfsd", addr);
386
387         if (!ipm)
388                 return NULL;
389         if (cache_check(&ip_map_cache, &ipm->h, NULL))
390                 return NULL;
391
392         if ((ipm->m_client->addr_changes - ipm->m_add_change) >0) {
393                 if (test_and_set_bit(CACHE_NEGATIVE, &ipm->h.flags) == 0)
394                         auth_domain_put(&ipm->m_client->h);
395                 rv = NULL;
396         } else {
397                 rv = &ipm->m_client->h;
398                 kref_get(&rv->ref);
399         }
400         cache_put(&ipm->h, &ip_map_cache);
401         return rv;
402 }
403 EXPORT_SYMBOL_GPL(auth_unix_lookup);
404
405 void svcauth_unix_purge(void)
406 {
407         cache_purge(&ip_map_cache);
408 }
409 EXPORT_SYMBOL_GPL(svcauth_unix_purge);
410
411 static inline struct ip_map *
412 ip_map_cached_get(struct svc_rqst *rqstp)
413 {
414         struct ip_map *ipm = NULL;
415         struct svc_xprt *xprt = rqstp->rq_xprt;
416
417         if (test_bit(XPT_CACHE_AUTH, &xprt->xpt_flags)) {
418                 spin_lock(&xprt->xpt_lock);
419                 ipm = xprt->xpt_auth_cache;
420                 if (ipm != NULL) {
421                         if (!cache_valid(&ipm->h)) {
422                                 /*
423                                  * The entry has been invalidated since it was
424                                  * remembered, e.g. by a second mount from the
425                                  * same IP address.
426                                  */
427                                 xprt->xpt_auth_cache = NULL;
428                                 spin_unlock(&xprt->xpt_lock);
429                                 cache_put(&ipm->h, &ip_map_cache);
430                                 return NULL;
431                         }
432                         cache_get(&ipm->h);
433                 }
434                 spin_unlock(&xprt->xpt_lock);
435         }
436         return ipm;
437 }
438
439 static inline void
440 ip_map_cached_put(struct svc_rqst *rqstp, struct ip_map *ipm)
441 {
442         struct svc_xprt *xprt = rqstp->rq_xprt;
443
444         if (test_bit(XPT_CACHE_AUTH, &xprt->xpt_flags)) {
445                 spin_lock(&xprt->xpt_lock);
446                 if (xprt->xpt_auth_cache == NULL) {
447                         /* newly cached, keep the reference */
448                         xprt->xpt_auth_cache = ipm;
449                         ipm = NULL;
450                 }
451                 spin_unlock(&xprt->xpt_lock);
452         }
453         if (ipm)
454                 cache_put(&ipm->h, &ip_map_cache);
455 }
456
457 void
458 svcauth_unix_info_release(void *info)
459 {
460         struct ip_map *ipm = info;
461         cache_put(&ipm->h, &ip_map_cache);
462 }
463
464 /****************************************************************************
465  * auth.unix.gid cache
466  * simple cache to map a UID to a list of GIDs
467  * because AUTH_UNIX aka AUTH_SYS has a max of 16
468  */
469 #define GID_HASHBITS    8
470 #define GID_HASHMAX     (1<<GID_HASHBITS)
471 #define GID_HASHMASK    (GID_HASHMAX - 1)
472
473 struct unix_gid {
474         struct cache_head       h;
475         uid_t                   uid;
476         struct group_info       *gi;
477 };
478 static struct cache_head        *gid_table[GID_HASHMAX];
479
480 static void unix_gid_put(struct kref *kref)
481 {
482         struct cache_head *item = container_of(kref, struct cache_head, ref);
483         struct unix_gid *ug = container_of(item, struct unix_gid, h);
484         if (test_bit(CACHE_VALID, &item->flags) &&
485             !test_bit(CACHE_NEGATIVE, &item->flags))
486                 put_group_info(ug->gi);
487         kfree(ug);
488 }
489
490 static int unix_gid_match(struct cache_head *corig, struct cache_head *cnew)
491 {
492         struct unix_gid *orig = container_of(corig, struct unix_gid, h);
493         struct unix_gid *new = container_of(cnew, struct unix_gid, h);
494         return orig->uid == new->uid;
495 }
496 static void unix_gid_init(struct cache_head *cnew, struct cache_head *citem)
497 {
498         struct unix_gid *new = container_of(cnew, struct unix_gid, h);
499         struct unix_gid *item = container_of(citem, struct unix_gid, h);
500         new->uid = item->uid;
501 }
502 static void unix_gid_update(struct cache_head *cnew, struct cache_head *citem)
503 {
504         struct unix_gid *new = container_of(cnew, struct unix_gid, h);
505         struct unix_gid *item = container_of(citem, struct unix_gid, h);
506
507         get_group_info(item->gi);
508         new->gi = item->gi;
509 }
510 static struct cache_head *unix_gid_alloc(void)
511 {
512         struct unix_gid *g = kmalloc(sizeof(*g), GFP_KERNEL);
513         if (g)
514                 return &g->h;
515         else
516                 return NULL;
517 }
518
519 static void unix_gid_request(struct cache_detail *cd,
520                              struct cache_head *h,
521                              char **bpp, int *blen)
522 {
523         char tuid[20];
524         struct unix_gid *ug = container_of(h, struct unix_gid, h);
525
526         snprintf(tuid, 20, "%u", ug->uid);
527         qword_add(bpp, blen, tuid);
528         (*bpp)[-1] = '\n';
529 }
530
531 static int unix_gid_upcall(struct cache_detail *cd, struct cache_head *h)
532 {
533         return sunrpc_cache_pipe_upcall(cd, h, unix_gid_request);
534 }
535
536 static struct unix_gid *unix_gid_lookup(uid_t uid);
537 extern struct cache_detail unix_gid_cache;
538
539 static int unix_gid_parse(struct cache_detail *cd,
540                         char *mesg, int mlen)
541 {
542         /* uid expiry Ngid gid0 gid1 ... gidN-1 */
543         int uid;
544         int gids;
545         int rv;
546         int i;
547         int err;
548         time_t expiry;
549         struct unix_gid ug, *ugp;
550
551         if (mlen <= 0 || mesg[mlen-1] != '\n')
552                 return -EINVAL;
553         mesg[mlen-1] = 0;
554
555         rv = get_int(&mesg, &uid);
556         if (rv)
557                 return -EINVAL;
558         ug.uid = uid;
559
560         expiry = get_expiry(&mesg);
561         if (expiry == 0)
562                 return -EINVAL;
563
564         rv = get_int(&mesg, &gids);
565         if (rv || gids < 0 || gids > 8192)
566                 return -EINVAL;
567
568         ug.gi = groups_alloc(gids);
569         if (!ug.gi)
570                 return -ENOMEM;
571
572         for (i = 0 ; i < gids ; i++) {
573                 int gid;
574                 rv = get_int(&mesg, &gid);
575                 err = -EINVAL;
576                 if (rv)
577                         goto out;
578                 GROUP_AT(ug.gi, i) = gid;
579         }
580
581         ugp = unix_gid_lookup(uid);
582         if (ugp) {
583                 struct cache_head *ch;
584                 ug.h.flags = 0;
585                 ug.h.expiry_time = expiry;
586                 ch = sunrpc_cache_update(&unix_gid_cache,
587                                          &ug.h, &ugp->h,
588                                          hash_long(uid, GID_HASHBITS));
589                 if (!ch)
590                         err = -ENOMEM;
591                 else {
592                         err = 0;
593                         cache_put(ch, &unix_gid_cache);
594                 }
595         } else
596                 err = -ENOMEM;
597  out:
598         if (ug.gi)
599                 put_group_info(ug.gi);
600         return err;
601 }
602
603 static int unix_gid_show(struct seq_file *m,
604                          struct cache_detail *cd,
605                          struct cache_head *h)
606 {
607         struct unix_gid *ug;
608         int i;
609         int glen;
610
611         if (h == NULL) {
612                 seq_puts(m, "#uid cnt: gids...\n");
613                 return 0;
614         }
615         ug = container_of(h, struct unix_gid, h);
616         if (test_bit(CACHE_VALID, &h->flags) &&
617             !test_bit(CACHE_NEGATIVE, &h->flags))
618                 glen = ug->gi->ngroups;
619         else
620                 glen = 0;
621
622         seq_printf(m, "%d %d:", ug->uid, glen);
623         for (i = 0; i < glen; i++)
624                 seq_printf(m, " %d", GROUP_AT(ug->gi, i));
625         seq_printf(m, "\n");
626         return 0;
627 }
628
629 struct cache_detail unix_gid_cache = {
630         .owner          = THIS_MODULE,
631         .hash_size      = GID_HASHMAX,
632         .hash_table     = gid_table,
633         .name           = "auth.unix.gid",
634         .cache_put      = unix_gid_put,
635         .cache_upcall   = unix_gid_upcall,
636         .cache_parse    = unix_gid_parse,
637         .cache_show     = unix_gid_show,
638         .match          = unix_gid_match,
639         .init           = unix_gid_init,
640         .update         = unix_gid_update,
641         .alloc          = unix_gid_alloc,
642 };
643
644 static struct unix_gid *unix_gid_lookup(uid_t uid)
645 {
646         struct unix_gid ug;
647         struct cache_head *ch;
648
649         ug.uid = uid;
650         ch = sunrpc_cache_lookup(&unix_gid_cache, &ug.h,
651                                  hash_long(uid, GID_HASHBITS));
652         if (ch)
653                 return container_of(ch, struct unix_gid, h);
654         else
655                 return NULL;
656 }
657
658 static int unix_gid_find(uid_t uid, struct group_info **gip,
659                          struct svc_rqst *rqstp)
660 {
661         struct unix_gid *ug = unix_gid_lookup(uid);
662         if (!ug)
663                 return -EAGAIN;
664         switch (cache_check(&unix_gid_cache, &ug->h, &rqstp->rq_chandle)) {
665         case -ENOENT:
666                 *gip = NULL;
667                 return 0;
668         case 0:
669                 *gip = ug->gi;
670                 get_group_info(*gip);
671                 cache_put(&ug->h, &unix_gid_cache);
672                 return 0;
673         default:
674                 return -EAGAIN;
675         }
676 }
677
678 int
679 svcauth_unix_set_client(struct svc_rqst *rqstp)
680 {
681         struct sockaddr_in *sin;
682         struct sockaddr_in6 *sin6, sin6_storage;
683         struct ip_map *ipm;
684
685         switch (rqstp->rq_addr.ss_family) {
686         case AF_INET:
687                 sin = svc_addr_in(rqstp);
688                 sin6 = &sin6_storage;
689                 ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &sin6->sin6_addr);
690                 break;
691         case AF_INET6:
692                 sin6 = svc_addr_in6(rqstp);
693                 break;
694         default:
695                 BUG();
696         }
697
698         rqstp->rq_client = NULL;
699         if (rqstp->rq_proc == 0)
700                 return SVC_OK;
701
702         ipm = ip_map_cached_get(rqstp);
703         if (ipm == NULL)
704                 ipm = ip_map_lookup(rqstp->rq_server->sv_program->pg_class,
705                                     &sin6->sin6_addr);
706
707         if (ipm == NULL)
708                 return SVC_DENIED;
709
710         switch (cache_check(&ip_map_cache, &ipm->h, &rqstp->rq_chandle)) {
711                 default:
712                         BUG();
713                 case -EAGAIN:
714                 case -ETIMEDOUT:
715                         return SVC_DROP;
716                 case -ENOENT:
717                         return SVC_DENIED;
718                 case 0:
719                         rqstp->rq_client = &ipm->m_client->h;
720                         kref_get(&rqstp->rq_client->ref);
721                         ip_map_cached_put(rqstp, ipm);
722                         break;
723         }
724         return SVC_OK;
725 }
726
727 EXPORT_SYMBOL_GPL(svcauth_unix_set_client);
728
729 static int
730 svcauth_null_accept(struct svc_rqst *rqstp, __be32 *authp)
731 {
732         struct kvec     *argv = &rqstp->rq_arg.head[0];
733         struct kvec     *resv = &rqstp->rq_res.head[0];
734         struct svc_cred *cred = &rqstp->rq_cred;
735
736         cred->cr_group_info = NULL;
737         rqstp->rq_client = NULL;
738
739         if (argv->iov_len < 3*4)
740                 return SVC_GARBAGE;
741
742         if (svc_getu32(argv) != 0) {
743                 dprintk("svc: bad null cred\n");
744                 *authp = rpc_autherr_badcred;
745                 return SVC_DENIED;
746         }
747         if (svc_getu32(argv) != htonl(RPC_AUTH_NULL) || svc_getu32(argv) != 0) {
748                 dprintk("svc: bad null verf\n");
749                 *authp = rpc_autherr_badverf;
750                 return SVC_DENIED;
751         }
752
753         /* Signal that mapping to nobody uid/gid is required */
754         cred->cr_uid = (uid_t) -1;
755         cred->cr_gid = (gid_t) -1;
756         cred->cr_group_info = groups_alloc(0);
757         if (cred->cr_group_info == NULL)
758                 return SVC_DROP; /* kmalloc failure - client must retry */
759
760         /* Put NULL verifier */
761         svc_putnl(resv, RPC_AUTH_NULL);
762         svc_putnl(resv, 0);
763
764         rqstp->rq_flavor = RPC_AUTH_NULL;
765         return SVC_OK;
766 }
767
768 static int
769 svcauth_null_release(struct svc_rqst *rqstp)
770 {
771         if (rqstp->rq_client)
772                 auth_domain_put(rqstp->rq_client);
773         rqstp->rq_client = NULL;
774         if (rqstp->rq_cred.cr_group_info)
775                 put_group_info(rqstp->rq_cred.cr_group_info);
776         rqstp->rq_cred.cr_group_info = NULL;
777
778         return 0; /* don't drop */
779 }
780
781
782 struct auth_ops svcauth_null = {
783         .name           = "null",
784         .owner          = THIS_MODULE,
785         .flavour        = RPC_AUTH_NULL,
786         .accept         = svcauth_null_accept,
787         .release        = svcauth_null_release,
788         .set_client     = svcauth_unix_set_client,
789 };
790
791
792 static int
793 svcauth_unix_accept(struct svc_rqst *rqstp, __be32 *authp)
794 {
795         struct kvec     *argv = &rqstp->rq_arg.head[0];
796         struct kvec     *resv = &rqstp->rq_res.head[0];
797         struct svc_cred *cred = &rqstp->rq_cred;
798         u32             slen, i;
799         int             len   = argv->iov_len;
800
801         cred->cr_group_info = NULL;
802         rqstp->rq_client = NULL;
803
804         if ((len -= 3*4) < 0)
805                 return SVC_GARBAGE;
806
807         svc_getu32(argv);                       /* length */
808         svc_getu32(argv);                       /* time stamp */
809         slen = XDR_QUADLEN(svc_getnl(argv));    /* machname length */
810         if (slen > 64 || (len -= (slen + 3)*4) < 0)
811                 goto badcred;
812         argv->iov_base = (void*)((__be32*)argv->iov_base + slen);       /* skip machname */
813         argv->iov_len -= slen*4;
814
815         cred->cr_uid = svc_getnl(argv);         /* uid */
816         cred->cr_gid = svc_getnl(argv);         /* gid */
817         slen = svc_getnl(argv);                 /* gids length */
818         if (slen > 16 || (len -= (slen + 2)*4) < 0)
819                 goto badcred;
820         if (unix_gid_find(cred->cr_uid, &cred->cr_group_info, rqstp)
821             == -EAGAIN)
822                 return SVC_DROP;
823         if (cred->cr_group_info == NULL) {
824                 cred->cr_group_info = groups_alloc(slen);
825                 if (cred->cr_group_info == NULL)
826                         return SVC_DROP;
827                 for (i = 0; i < slen; i++)
828                         GROUP_AT(cred->cr_group_info, i) = svc_getnl(argv);
829         } else {
830                 for (i = 0; i < slen ; i++)
831                         svc_getnl(argv);
832         }
833         if (svc_getu32(argv) != htonl(RPC_AUTH_NULL) || svc_getu32(argv) != 0) {
834                 *authp = rpc_autherr_badverf;
835                 return SVC_DENIED;
836         }
837
838         /* Put NULL verifier */
839         svc_putnl(resv, RPC_AUTH_NULL);
840         svc_putnl(resv, 0);
841
842         rqstp->rq_flavor = RPC_AUTH_UNIX;
843         return SVC_OK;
844
845 badcred:
846         *authp = rpc_autherr_badcred;
847         return SVC_DENIED;
848 }
849
850 static int
851 svcauth_unix_release(struct svc_rqst *rqstp)
852 {
853         /* Verifier (such as it is) is already in place.
854          */
855         if (rqstp->rq_client)
856                 auth_domain_put(rqstp->rq_client);
857         rqstp->rq_client = NULL;
858         if (rqstp->rq_cred.cr_group_info)
859                 put_group_info(rqstp->rq_cred.cr_group_info);
860         rqstp->rq_cred.cr_group_info = NULL;
861
862         return 0;
863 }
864
865
866 struct auth_ops svcauth_unix = {
867         .name           = "unix",
868         .owner          = THIS_MODULE,
869         .flavour        = RPC_AUTH_UNIX,
870         .accept         = svcauth_unix_accept,
871         .release        = svcauth_unix_release,
872         .domain_release = svcauth_unix_domain_release,
873         .set_client     = svcauth_unix_set_client,
874 };
875