Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux...
[platform/adaptation/renesas_rcar/renesas_kernel.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 <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 }