[S390] cio/ipl: Clean interface between cio and ipl code.
[linux-2.6] / 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/err.h>
9 #include <linux/seq_file.h>
10 #include <linux/hash.h>
11 #include <linux/string.h>
12 #include <net/sock.h>
13
14 #define RPCDBG_FACILITY RPCDBG_AUTH
15
16
17 /*
18  * AUTHUNIX and AUTHNULL credentials are both handled here.
19  * AUTHNULL is treated just like AUTHUNIX except that the uid/gid
20  * are always nobody (-2).  i.e. we do the same IP address checks for
21  * AUTHNULL as for AUTHUNIX, and that is done here.
22  */
23
24
25 struct unix_domain {
26         struct auth_domain      h;
27         int     addr_changes;
28         /* other stuff later */
29 };
30
31 extern struct auth_ops svcauth_unix;
32
33 struct auth_domain *unix_domain_find(char *name)
34 {
35         struct auth_domain *rv;
36         struct unix_domain *new = NULL;
37
38         rv = auth_domain_lookup(name, NULL);
39         while(1) {
40                 if (rv) {
41                         if (new && rv != &new->h)
42                                 auth_domain_put(&new->h);
43
44                         if (rv->flavour != &svcauth_unix) {
45                                 auth_domain_put(rv);
46                                 return NULL;
47                         }
48                         return rv;
49                 }
50
51                 new = kmalloc(sizeof(*new), GFP_KERNEL);
52                 if (new == NULL)
53                         return NULL;
54                 kref_init(&new->h.ref);
55                 new->h.name = kstrdup(name, GFP_KERNEL);
56                 if (new->h.name == NULL) {
57                         kfree(new);
58                         return NULL;
59                 }
60                 new->h.flavour = &svcauth_unix;
61                 new->addr_changes = 0;
62                 rv = auth_domain_lookup(name, &new->h);
63         }
64 }
65
66 static void svcauth_unix_domain_release(struct auth_domain *dom)
67 {
68         struct unix_domain *ud = container_of(dom, struct unix_domain, h);
69
70         kfree(dom->name);
71         kfree(ud);
72 }
73
74
75 /**************************************************
76  * cache for IP address to unix_domain
77  * as needed by AUTH_UNIX
78  */
79 #define IP_HASHBITS     8
80 #define IP_HASHMAX      (1<<IP_HASHBITS)
81 #define IP_HASHMASK     (IP_HASHMAX-1)
82
83 struct ip_map {
84         struct cache_head       h;
85         char                    m_class[8]; /* e.g. "nfsd" */
86         struct in_addr          m_addr;
87         struct unix_domain      *m_client;
88         int                     m_add_change;
89 };
90 static struct cache_head        *ip_table[IP_HASHMAX];
91
92 static void ip_map_put(struct kref *kref)
93 {
94         struct cache_head *item = container_of(kref, struct cache_head, ref);
95         struct ip_map *im = container_of(item, struct ip_map,h);
96
97         if (test_bit(CACHE_VALID, &item->flags) &&
98             !test_bit(CACHE_NEGATIVE, &item->flags))
99                 auth_domain_put(&im->m_client->h);
100         kfree(im);
101 }
102
103 #if IP_HASHBITS == 8
104 /* hash_long on a 64 bit machine is currently REALLY BAD for
105  * IP addresses in reverse-endian (i.e. on a little-endian machine).
106  * So use a trivial but reliable hash instead
107  */
108 static inline int hash_ip(__be32 ip)
109 {
110         int hash = (__force u32)ip ^ ((__force u32)ip>>16);
111         return (hash ^ (hash>>8)) & 0xff;
112 }
113 #endif
114 static int ip_map_match(struct cache_head *corig, struct cache_head *cnew)
115 {
116         struct ip_map *orig = container_of(corig, struct ip_map, h);
117         struct ip_map *new = container_of(cnew, struct ip_map, h);
118         return strcmp(orig->m_class, new->m_class) == 0
119                 && orig->m_addr.s_addr == new->m_addr.s_addr;
120 }
121 static void ip_map_init(struct cache_head *cnew, struct cache_head *citem)
122 {
123         struct ip_map *new = container_of(cnew, struct ip_map, h);
124         struct ip_map *item = container_of(citem, struct ip_map, h);
125
126         strcpy(new->m_class, item->m_class);
127         new->m_addr.s_addr = item->m_addr.s_addr;
128 }
129 static void update(struct cache_head *cnew, struct cache_head *citem)
130 {
131         struct ip_map *new = container_of(cnew, struct ip_map, h);
132         struct ip_map *item = container_of(citem, struct ip_map, h);
133
134         kref_get(&item->m_client->h.ref);
135         new->m_client = item->m_client;
136         new->m_add_change = item->m_add_change;
137 }
138 static struct cache_head *ip_map_alloc(void)
139 {
140         struct ip_map *i = kmalloc(sizeof(*i), GFP_KERNEL);
141         if (i)
142                 return &i->h;
143         else
144                 return NULL;
145 }
146
147 static void ip_map_request(struct cache_detail *cd,
148                                   struct cache_head *h,
149                                   char **bpp, int *blen)
150 {
151         char text_addr[20];
152         struct ip_map *im = container_of(h, struct ip_map, h);
153         __be32 addr = im->m_addr.s_addr;
154
155         snprintf(text_addr, 20, "%u.%u.%u.%u",
156                  ntohl(addr) >> 24 & 0xff,
157                  ntohl(addr) >> 16 & 0xff,
158                  ntohl(addr) >>  8 & 0xff,
159                  ntohl(addr) >>  0 & 0xff);
160
161         qword_add(bpp, blen, im->m_class);
162         qword_add(bpp, blen, text_addr);
163         (*bpp)[-1] = '\n';
164 }
165
166 static struct ip_map *ip_map_lookup(char *class, struct in_addr addr);
167 static int ip_map_update(struct ip_map *ipm, struct unix_domain *udom, time_t expiry);
168
169 static int ip_map_parse(struct cache_detail *cd,
170                           char *mesg, int mlen)
171 {
172         /* class ipaddress [domainname] */
173         /* should be safe just to use the start of the input buffer
174          * for scratch: */
175         char *buf = mesg;
176         int len;
177         int b1,b2,b3,b4;
178         char c;
179         char class[8];
180         struct in_addr addr;
181         int err;
182
183         struct ip_map *ipmp;
184         struct auth_domain *dom;
185         time_t expiry;
186
187         if (mesg[mlen-1] != '\n')
188                 return -EINVAL;
189         mesg[mlen-1] = 0;
190
191         /* class */
192         len = qword_get(&mesg, class, sizeof(class));
193         if (len <= 0) return -EINVAL;
194
195         /* ip address */
196         len = qword_get(&mesg, buf, mlen);
197         if (len <= 0) return -EINVAL;
198
199         if (sscanf(buf, "%u.%u.%u.%u%c", &b1, &b2, &b3, &b4, &c) != 4)
200                 return -EINVAL;
201
202         expiry = get_expiry(&mesg);
203         if (expiry ==0)
204                 return -EINVAL;
205
206         /* domainname, or empty for NEGATIVE */
207         len = qword_get(&mesg, buf, mlen);
208         if (len < 0) return -EINVAL;
209
210         if (len) {
211                 dom = unix_domain_find(buf);
212                 if (dom == NULL)
213                         return -ENOENT;
214         } else
215                 dom = NULL;
216
217         addr.s_addr =
218                 htonl((((((b1<<8)|b2)<<8)|b3)<<8)|b4);
219
220         ipmp = ip_map_lookup(class,addr);
221         if (ipmp) {
222                 err = ip_map_update(ipmp,
223                              container_of(dom, struct unix_domain, h),
224                              expiry);
225         } else
226                 err = -ENOMEM;
227
228         if (dom)
229                 auth_domain_put(dom);
230
231         cache_flush();
232         return err;
233 }
234
235 static int ip_map_show(struct seq_file *m,
236                        struct cache_detail *cd,
237                        struct cache_head *h)
238 {
239         struct ip_map *im;
240         struct in_addr addr;
241         char *dom = "-no-domain-";
242
243         if (h == NULL) {
244                 seq_puts(m, "#class IP domain\n");
245                 return 0;
246         }
247         im = container_of(h, struct ip_map, h);
248         /* class addr domain */
249         addr = im->m_addr;
250
251         if (test_bit(CACHE_VALID, &h->flags) &&
252             !test_bit(CACHE_NEGATIVE, &h->flags))
253                 dom = im->m_client->h.name;
254
255         seq_printf(m, "%s %d.%d.%d.%d %s\n",
256                    im->m_class,
257                    ntohl(addr.s_addr) >> 24 & 0xff,
258                    ntohl(addr.s_addr) >> 16 & 0xff,
259                    ntohl(addr.s_addr) >>  8 & 0xff,
260                    ntohl(addr.s_addr) >>  0 & 0xff,
261                    dom
262                    );
263         return 0;
264 }
265
266
267 struct cache_detail ip_map_cache = {
268         .owner          = THIS_MODULE,
269         .hash_size      = IP_HASHMAX,
270         .hash_table     = ip_table,
271         .name           = "auth.unix.ip",
272         .cache_put      = ip_map_put,
273         .cache_request  = ip_map_request,
274         .cache_parse    = ip_map_parse,
275         .cache_show     = ip_map_show,
276         .match          = ip_map_match,
277         .init           = ip_map_init,
278         .update         = update,
279         .alloc          = ip_map_alloc,
280 };
281
282 static struct ip_map *ip_map_lookup(char *class, struct in_addr addr)
283 {
284         struct ip_map ip;
285         struct cache_head *ch;
286
287         strcpy(ip.m_class, class);
288         ip.m_addr = addr;
289         ch = sunrpc_cache_lookup(&ip_map_cache, &ip.h,
290                                  hash_str(class, IP_HASHBITS) ^
291                                  hash_ip(addr.s_addr));
292
293         if (ch)
294                 return container_of(ch, struct ip_map, h);
295         else
296                 return NULL;
297 }
298
299 static int ip_map_update(struct ip_map *ipm, struct unix_domain *udom, time_t expiry)
300 {
301         struct ip_map ip;
302         struct cache_head *ch;
303
304         ip.m_client = udom;
305         ip.h.flags = 0;
306         if (!udom)
307                 set_bit(CACHE_NEGATIVE, &ip.h.flags);
308         else {
309                 ip.m_add_change = udom->addr_changes;
310                 /* if this is from the legacy set_client system call,
311                  * we need m_add_change to be one higher
312                  */
313                 if (expiry == NEVER)
314                         ip.m_add_change++;
315         }
316         ip.h.expiry_time = expiry;
317         ch = sunrpc_cache_update(&ip_map_cache,
318                                  &ip.h, &ipm->h,
319                                  hash_str(ipm->m_class, IP_HASHBITS) ^
320                                  hash_ip(ipm->m_addr.s_addr));
321         if (!ch)
322                 return -ENOMEM;
323         cache_put(ch, &ip_map_cache);
324         return 0;
325 }
326
327 int auth_unix_add_addr(struct in_addr addr, struct auth_domain *dom)
328 {
329         struct unix_domain *udom;
330         struct ip_map *ipmp;
331
332         if (dom->flavour != &svcauth_unix)
333                 return -EINVAL;
334         udom = container_of(dom, struct unix_domain, h);
335         ipmp = ip_map_lookup("nfsd", addr);
336
337         if (ipmp)
338                 return ip_map_update(ipmp, udom, NEVER);
339         else
340                 return -ENOMEM;
341 }
342
343 int auth_unix_forget_old(struct auth_domain *dom)
344 {
345         struct unix_domain *udom;
346
347         if (dom->flavour != &svcauth_unix)
348                 return -EINVAL;
349         udom = container_of(dom, struct unix_domain, h);
350         udom->addr_changes++;
351         return 0;
352 }
353
354 struct auth_domain *auth_unix_lookup(struct in_addr addr)
355 {
356         struct ip_map *ipm;
357         struct auth_domain *rv;
358
359         ipm = ip_map_lookup("nfsd", addr);
360
361         if (!ipm)
362                 return NULL;
363         if (cache_check(&ip_map_cache, &ipm->h, NULL))
364                 return NULL;
365
366         if ((ipm->m_client->addr_changes - ipm->m_add_change) >0) {
367                 if (test_and_set_bit(CACHE_NEGATIVE, &ipm->h.flags) == 0)
368                         auth_domain_put(&ipm->m_client->h);
369                 rv = NULL;
370         } else {
371                 rv = &ipm->m_client->h;
372                 kref_get(&rv->ref);
373         }
374         cache_put(&ipm->h, &ip_map_cache);
375         return rv;
376 }
377
378 void svcauth_unix_purge(void)
379 {
380         cache_purge(&ip_map_cache);
381 }
382
383 static inline struct ip_map *
384 ip_map_cached_get(struct svc_rqst *rqstp)
385 {
386         struct ip_map *ipm;
387         struct svc_sock *svsk = rqstp->rq_sock;
388         spin_lock_bh(&svsk->sk_defer_lock);
389         ipm = svsk->sk_info_authunix;
390         if (ipm != NULL) {
391                 if (!cache_valid(&ipm->h)) {
392                         /*
393                          * The entry has been invalidated since it was
394                          * remembered, e.g. by a second mount from the
395                          * same IP address.
396                          */
397                         svsk->sk_info_authunix = NULL;
398                         spin_unlock_bh(&svsk->sk_defer_lock);
399                         cache_put(&ipm->h, &ip_map_cache);
400                         return NULL;
401                 }
402                 cache_get(&ipm->h);
403         }
404         spin_unlock_bh(&svsk->sk_defer_lock);
405         return ipm;
406 }
407
408 static inline void
409 ip_map_cached_put(struct svc_rqst *rqstp, struct ip_map *ipm)
410 {
411         struct svc_sock *svsk = rqstp->rq_sock;
412
413         spin_lock_bh(&svsk->sk_defer_lock);
414         if (svsk->sk_sock->type == SOCK_STREAM &&
415             svsk->sk_info_authunix == NULL) {
416                 /* newly cached, keep the reference */
417                 svsk->sk_info_authunix = ipm;
418                 ipm = NULL;
419         }
420         spin_unlock_bh(&svsk->sk_defer_lock);
421         if (ipm)
422                 cache_put(&ipm->h, &ip_map_cache);
423 }
424
425 void
426 svcauth_unix_info_release(void *info)
427 {
428         struct ip_map *ipm = info;
429         cache_put(&ipm->h, &ip_map_cache);
430 }
431
432 /****************************************************************************
433  * auth.unix.gid cache
434  * simple cache to map a UID to a list of GIDs
435  * because AUTH_UNIX aka AUTH_SYS has a max of 16
436  */
437 #define GID_HASHBITS    8
438 #define GID_HASHMAX     (1<<GID_HASHBITS)
439 #define GID_HASHMASK    (GID_HASHMAX - 1)
440
441 struct unix_gid {
442         struct cache_head       h;
443         uid_t                   uid;
444         struct group_info       *gi;
445 };
446 static struct cache_head        *gid_table[GID_HASHMAX];
447
448 static void unix_gid_put(struct kref *kref)
449 {
450         struct cache_head *item = container_of(kref, struct cache_head, ref);
451         struct unix_gid *ug = container_of(item, struct unix_gid, h);
452         if (test_bit(CACHE_VALID, &item->flags) &&
453             !test_bit(CACHE_NEGATIVE, &item->flags))
454                 put_group_info(ug->gi);
455         kfree(ug);
456 }
457
458 static int unix_gid_match(struct cache_head *corig, struct cache_head *cnew)
459 {
460         struct unix_gid *orig = container_of(corig, struct unix_gid, h);
461         struct unix_gid *new = container_of(cnew, struct unix_gid, h);
462         return orig->uid == new->uid;
463 }
464 static void unix_gid_init(struct cache_head *cnew, struct cache_head *citem)
465 {
466         struct unix_gid *new = container_of(cnew, struct unix_gid, h);
467         struct unix_gid *item = container_of(citem, struct unix_gid, h);
468         new->uid = item->uid;
469 }
470 static void unix_gid_update(struct cache_head *cnew, struct cache_head *citem)
471 {
472         struct unix_gid *new = container_of(cnew, struct unix_gid, h);
473         struct unix_gid *item = container_of(citem, struct unix_gid, h);
474
475         get_group_info(item->gi);
476         new->gi = item->gi;
477 }
478 static struct cache_head *unix_gid_alloc(void)
479 {
480         struct unix_gid *g = kmalloc(sizeof(*g), GFP_KERNEL);
481         if (g)
482                 return &g->h;
483         else
484                 return NULL;
485 }
486
487 static void unix_gid_request(struct cache_detail *cd,
488                              struct cache_head *h,
489                              char **bpp, int *blen)
490 {
491         char tuid[20];
492         struct unix_gid *ug = container_of(h, struct unix_gid, h);
493
494         snprintf(tuid, 20, "%u", ug->uid);
495         qword_add(bpp, blen, tuid);
496         (*bpp)[-1] = '\n';
497 }
498
499 static struct unix_gid *unix_gid_lookup(uid_t uid);
500 extern struct cache_detail unix_gid_cache;
501
502 static int unix_gid_parse(struct cache_detail *cd,
503                         char *mesg, int mlen)
504 {
505         /* uid expiry Ngid gid0 gid1 ... gidN-1 */
506         int uid;
507         int gids;
508         int rv;
509         int i;
510         int err;
511         time_t expiry;
512         struct unix_gid ug, *ugp;
513
514         if (mlen <= 0 || mesg[mlen-1] != '\n')
515                 return -EINVAL;
516         mesg[mlen-1] = 0;
517
518         rv = get_int(&mesg, &uid);
519         if (rv)
520                 return -EINVAL;
521         ug.uid = uid;
522
523         expiry = get_expiry(&mesg);
524         if (expiry == 0)
525                 return -EINVAL;
526
527         rv = get_int(&mesg, &gids);
528         if (rv || gids < 0 || gids > 8192)
529                 return -EINVAL;
530
531         ug.gi = groups_alloc(gids);
532         if (!ug.gi)
533                 return -ENOMEM;
534
535         for (i = 0 ; i < gids ; i++) {
536                 int gid;
537                 rv = get_int(&mesg, &gid);
538                 err = -EINVAL;
539                 if (rv)
540                         goto out;
541                 GROUP_AT(ug.gi, i) = gid;
542         }
543
544         ugp = unix_gid_lookup(uid);
545         if (ugp) {
546                 struct cache_head *ch;
547                 ug.h.flags = 0;
548                 ug.h.expiry_time = expiry;
549                 ch = sunrpc_cache_update(&unix_gid_cache,
550                                          &ug.h, &ugp->h,
551                                          hash_long(uid, GID_HASHBITS));
552                 if (!ch)
553                         err = -ENOMEM;
554                 else {
555                         err = 0;
556                         cache_put(ch, &unix_gid_cache);
557                 }
558         } else
559                 err = -ENOMEM;
560  out:
561         if (ug.gi)
562                 put_group_info(ug.gi);
563         return err;
564 }
565
566 static int unix_gid_show(struct seq_file *m,
567                          struct cache_detail *cd,
568                          struct cache_head *h)
569 {
570         struct unix_gid *ug;
571         int i;
572         int glen;
573
574         if (h == NULL) {
575                 seq_puts(m, "#uid cnt: gids...\n");
576                 return 0;
577         }
578         ug = container_of(h, struct unix_gid, h);
579         if (test_bit(CACHE_VALID, &h->flags) &&
580             !test_bit(CACHE_NEGATIVE, &h->flags))
581                 glen = ug->gi->ngroups;
582         else
583                 glen = 0;
584
585         seq_printf(m, "%d %d:", ug->uid, glen);
586         for (i = 0; i < glen; i++)
587                 seq_printf(m, " %d", GROUP_AT(ug->gi, i));
588         seq_printf(m, "\n");
589         return 0;
590 }
591
592 struct cache_detail unix_gid_cache = {
593         .owner          = THIS_MODULE,
594         .hash_size      = GID_HASHMAX,
595         .hash_table     = gid_table,
596         .name           = "auth.unix.gid",
597         .cache_put      = unix_gid_put,
598         .cache_request  = unix_gid_request,
599         .cache_parse    = unix_gid_parse,
600         .cache_show     = unix_gid_show,
601         .match          = unix_gid_match,
602         .init           = unix_gid_init,
603         .update         = unix_gid_update,
604         .alloc          = unix_gid_alloc,
605 };
606
607 static struct unix_gid *unix_gid_lookup(uid_t uid)
608 {
609         struct unix_gid ug;
610         struct cache_head *ch;
611
612         ug.uid = uid;
613         ch = sunrpc_cache_lookup(&unix_gid_cache, &ug.h,
614                                  hash_long(uid, GID_HASHBITS));
615         if (ch)
616                 return container_of(ch, struct unix_gid, h);
617         else
618                 return NULL;
619 }
620
621 static int unix_gid_find(uid_t uid, struct group_info **gip,
622                          struct svc_rqst *rqstp)
623 {
624         struct unix_gid *ug = unix_gid_lookup(uid);
625         if (!ug)
626                 return -EAGAIN;
627         switch (cache_check(&unix_gid_cache, &ug->h, &rqstp->rq_chandle)) {
628         case -ENOENT:
629                 *gip = NULL;
630                 return 0;
631         case 0:
632                 *gip = ug->gi;
633                 get_group_info(*gip);
634                 return 0;
635         default:
636                 return -EAGAIN;
637         }
638 }
639
640 static int
641 svcauth_unix_set_client(struct svc_rqst *rqstp)
642 {
643         struct sockaddr_in *sin = svc_addr_in(rqstp);
644         struct ip_map *ipm;
645
646         rqstp->rq_client = NULL;
647         if (rqstp->rq_proc == 0)
648                 return SVC_OK;
649
650         ipm = ip_map_cached_get(rqstp);
651         if (ipm == NULL)
652                 ipm = ip_map_lookup(rqstp->rq_server->sv_program->pg_class,
653                                     sin->sin_addr);
654
655         if (ipm == NULL)
656                 return SVC_DENIED;
657
658         switch (cache_check(&ip_map_cache, &ipm->h, &rqstp->rq_chandle)) {
659                 default:
660                         BUG();
661                 case -EAGAIN:
662                 case -ETIMEDOUT:
663                         return SVC_DROP;
664                 case -ENOENT:
665                         return SVC_DENIED;
666                 case 0:
667                         rqstp->rq_client = &ipm->m_client->h;
668                         kref_get(&rqstp->rq_client->ref);
669                         ip_map_cached_put(rqstp, ipm);
670                         break;
671         }
672         return SVC_OK;
673 }
674
675 static int
676 svcauth_null_accept(struct svc_rqst *rqstp, __be32 *authp)
677 {
678         struct kvec     *argv = &rqstp->rq_arg.head[0];
679         struct kvec     *resv = &rqstp->rq_res.head[0];
680         struct svc_cred *cred = &rqstp->rq_cred;
681
682         cred->cr_group_info = NULL;
683         rqstp->rq_client = NULL;
684
685         if (argv->iov_len < 3*4)
686                 return SVC_GARBAGE;
687
688         if (svc_getu32(argv) != 0) {
689                 dprintk("svc: bad null cred\n");
690                 *authp = rpc_autherr_badcred;
691                 return SVC_DENIED;
692         }
693         if (svc_getu32(argv) != htonl(RPC_AUTH_NULL) || svc_getu32(argv) != 0) {
694                 dprintk("svc: bad null verf\n");
695                 *authp = rpc_autherr_badverf;
696                 return SVC_DENIED;
697         }
698
699         /* Signal that mapping to nobody uid/gid is required */
700         cred->cr_uid = (uid_t) -1;
701         cred->cr_gid = (gid_t) -1;
702         cred->cr_group_info = groups_alloc(0);
703         if (cred->cr_group_info == NULL)
704                 return SVC_DROP; /* kmalloc failure - client must retry */
705
706         /* Put NULL verifier */
707         svc_putnl(resv, RPC_AUTH_NULL);
708         svc_putnl(resv, 0);
709
710         return SVC_OK;
711 }
712
713 static int
714 svcauth_null_release(struct svc_rqst *rqstp)
715 {
716         if (rqstp->rq_client)
717                 auth_domain_put(rqstp->rq_client);
718         rqstp->rq_client = NULL;
719         if (rqstp->rq_cred.cr_group_info)
720                 put_group_info(rqstp->rq_cred.cr_group_info);
721         rqstp->rq_cred.cr_group_info = NULL;
722
723         return 0; /* don't drop */
724 }
725
726
727 struct auth_ops svcauth_null = {
728         .name           = "null",
729         .owner          = THIS_MODULE,
730         .flavour        = RPC_AUTH_NULL,
731         .accept         = svcauth_null_accept,
732         .release        = svcauth_null_release,
733         .set_client     = svcauth_unix_set_client,
734 };
735
736
737 static int
738 svcauth_unix_accept(struct svc_rqst *rqstp, __be32 *authp)
739 {
740         struct kvec     *argv = &rqstp->rq_arg.head[0];
741         struct kvec     *resv = &rqstp->rq_res.head[0];
742         struct svc_cred *cred = &rqstp->rq_cred;
743         u32             slen, i;
744         int             len   = argv->iov_len;
745
746         cred->cr_group_info = NULL;
747         rqstp->rq_client = NULL;
748
749         if ((len -= 3*4) < 0)
750                 return SVC_GARBAGE;
751
752         svc_getu32(argv);                       /* length */
753         svc_getu32(argv);                       /* time stamp */
754         slen = XDR_QUADLEN(svc_getnl(argv));    /* machname length */
755         if (slen > 64 || (len -= (slen + 3)*4) < 0)
756                 goto badcred;
757         argv->iov_base = (void*)((__be32*)argv->iov_base + slen);       /* skip machname */
758         argv->iov_len -= slen*4;
759
760         cred->cr_uid = svc_getnl(argv);         /* uid */
761         cred->cr_gid = svc_getnl(argv);         /* gid */
762         slen = svc_getnl(argv);                 /* gids length */
763         if (slen > 16 || (len -= (slen + 2)*4) < 0)
764                 goto badcred;
765         if (unix_gid_find(cred->cr_uid, &cred->cr_group_info, rqstp)
766             == -EAGAIN)
767                 return SVC_DROP;
768         if (cred->cr_group_info == NULL) {
769                 cred->cr_group_info = groups_alloc(slen);
770                 if (cred->cr_group_info == NULL)
771                         return SVC_DROP;
772                 for (i = 0; i < slen; i++)
773                         GROUP_AT(cred->cr_group_info, i) = svc_getnl(argv);
774         } else {
775                 for (i = 0; i < slen ; i++)
776                         svc_getnl(argv);
777         }
778         if (svc_getu32(argv) != htonl(RPC_AUTH_NULL) || svc_getu32(argv) != 0) {
779                 *authp = rpc_autherr_badverf;
780                 return SVC_DENIED;
781         }
782
783         /* Put NULL verifier */
784         svc_putnl(resv, RPC_AUTH_NULL);
785         svc_putnl(resv, 0);
786
787         return SVC_OK;
788
789 badcred:
790         *authp = rpc_autherr_badcred;
791         return SVC_DENIED;
792 }
793
794 static int
795 svcauth_unix_release(struct svc_rqst *rqstp)
796 {
797         /* Verifier (such as it is) is already in place.
798          */
799         if (rqstp->rq_client)
800                 auth_domain_put(rqstp->rq_client);
801         rqstp->rq_client = NULL;
802         if (rqstp->rq_cred.cr_group_info)
803                 put_group_info(rqstp->rq_cred.cr_group_info);
804         rqstp->rq_cred.cr_group_info = NULL;
805
806         return 0;
807 }
808
809
810 struct auth_ops svcauth_unix = {
811         .name           = "unix",
812         .owner          = THIS_MODULE,
813         .flavour        = RPC_AUTH_UNIX,
814         .accept         = svcauth_unix_accept,
815         .release        = svcauth_unix_release,
816         .domain_release = svcauth_unix_domain_release,
817         .set_client     = svcauth_unix_set_client,
818 };
819