git.oblomov.eu Git - linux-2.6/blob - 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 struct ip_map *ip_map_lookup(char *class, struct in6_addr *addr);
 175 static int ip_map_update(struct ip_map *ipm, struct unix_domain *udom, time_t expiry);
 176
 177 static int ip_map_parse(struct cache_detail *cd,
 178                           char *mesg, int mlen)
 179 {
 180         /* class ipaddress [domainname] */
 181         /* should be safe just to use the start of the input buffer
 182          * for scratch: */
 183         char *buf = mesg;
 184         int len;
 185         int b1, b2, b3, b4, b5, b6, b7, b8;
 186         char c;
 187         char class[8];
 188         struct in6_addr addr;
 189         int err;
 190
 191         struct ip_map *ipmp;
 192         struct auth_domain *dom;
 193         time_t expiry;
 194
 195         if (mesg[mlen-1] != '\n')
 196                 return -EINVAL;
 197         mesg[mlen-1] = 0;
 198
 199         /* class */
 200         len = qword_get(&mesg, class, sizeof(class));
 201         if (len <= 0) return -EINVAL;
 202
 203         /* ip address */
 204         len = qword_get(&mesg, buf, mlen);
 205         if (len <= 0) return -EINVAL;
 206
 207         if (sscanf(buf, "%u.%u.%u.%u%c", &b1, &b2, &b3, &b4, &c) == 4) {
 208                 addr.s6_addr32[0] = 0;
 209                 addr.s6_addr32[1] = 0;
 210                 addr.s6_addr32[2] = htonl(0xffff);
 211                 addr.s6_addr32[3] =
 212                         htonl((((((b1<<8)|b2)<<8)|b3)<<8)|b4);
 213        } else if (sscanf(buf, "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x%c",
 214                         &b1, &b2, &b3, &b4, &b5, &b6, &b7, &b8, &c) == 8) {
 215                 addr.s6_addr16[0] = htons(b1);
 216                 addr.s6_addr16[1] = htons(b2);
 217                 addr.s6_addr16[2] = htons(b3);
 218                 addr.s6_addr16[3] = htons(b4);
 219                 addr.s6_addr16[4] = htons(b5);
 220                 addr.s6_addr16[5] = htons(b6);
 221                 addr.s6_addr16[6] = htons(b7);
 222                 addr.s6_addr16[7] = htons(b8);
 223        } else
 224                 return -EINVAL;
 225
 226         expiry = get_expiry(&mesg);
 227         if (expiry ==0)
 228                 return -EINVAL;
 229
 230         /* domainname, or empty for NEGATIVE */
 231         len = qword_get(&mesg, buf, mlen);
 232         if (len < 0) return -EINVAL;
 233
 234         if (len) {
 235                 dom = unix_domain_find(buf);
 236                 if (dom == NULL)
 237                         return -ENOENT;
 238         } else
 239                 dom = NULL;
 240
 241         ipmp = ip_map_lookup(class, &addr);
 242         if (ipmp) {
 243                 err = ip_map_update(ipmp,
 244                              container_of(dom, struct unix_domain, h),
 245                              expiry);
 246         } else
 247                 err = -ENOMEM;
 248
 249         if (dom)
 250                 auth_domain_put(dom);
 251
 252         cache_flush();
 253         return err;
 254 }
 255
 256 static int ip_map_show(struct seq_file *m,
 257                        struct cache_detail *cd,
 258                        struct cache_head *h)
 259 {
 260         struct ip_map *im;
 261         struct in6_addr addr;
 262         char *dom = "-no-domain-";
 263
 264         if (h == NULL) {
 265                 seq_puts(m, "#class IP domain\n");
 266                 return 0;
 267         }
 268         im = container_of(h, struct ip_map, h);
 269         /* class addr domain */
 270         ipv6_addr_copy(&addr, &im->m_addr);
 271
 272         if (test_bit(CACHE_VALID, &h->flags) &&
 273             !test_bit(CACHE_NEGATIVE, &h->flags))
 274                 dom = im->m_client->h.name;
 275
 276         if (ipv6_addr_v4mapped(&addr)) {
 277                 seq_printf(m, "%s %pI4 %s\n",
 278                         im->m_class, &addr.s6_addr32[3], dom);
 279         } else {
 280                 seq_printf(m, "%s %pI6 %s\n", im->m_class, &addr, dom);
 281         }
 282         return 0;
 283 }
 284
 285
 286 struct cache_detail ip_map_cache = {
 287         .owner          = THIS_MODULE,
 288         .hash_size      = IP_HASHMAX,
 289         .hash_table     = ip_table,
 290         .name           = "auth.unix.ip",
 291         .cache_put      = ip_map_put,
 292         .cache_request  = ip_map_request,
 293         .cache_parse    = ip_map_parse,
 294         .cache_show     = ip_map_show,
 295         .match          = ip_map_match,
 296         .init           = ip_map_init,
 297         .update         = update,
 298         .alloc          = ip_map_alloc,
 299 };
 300
 301 static struct ip_map *ip_map_lookup(char *class, struct in6_addr *addr)
 302 {
 303         struct ip_map ip;
 304         struct cache_head *ch;
 305
 306         strcpy(ip.m_class, class);
 307         ipv6_addr_copy(&ip.m_addr, addr);
 308         ch = sunrpc_cache_lookup(&ip_map_cache, &ip.h,
 309                                  hash_str(class, IP_HASHBITS) ^
 310                                  hash_ip6(*addr));
 311
 312         if (ch)
 313                 return container_of(ch, struct ip_map, h);
 314         else
 315                 return NULL;
 316 }
 317
 318 static int ip_map_update(struct ip_map *ipm, struct unix_domain *udom, time_t expiry)
 319 {
 320         struct ip_map ip;
 321         struct cache_head *ch;
 322
 323         ip.m_client = udom;
 324         ip.h.flags = 0;
 325         if (!udom)
 326                 set_bit(CACHE_NEGATIVE, &ip.h.flags);
 327         else {
 328                 ip.m_add_change = udom->addr_changes;
 329                 /* if this is from the legacy set_client system call,
 330                  * we need m_add_change to be one higher
 331                  */
 332                 if (expiry == NEVER)
 333                         ip.m_add_change++;
 334         }
 335         ip.h.expiry_time = expiry;
 336         ch = sunrpc_cache_update(&ip_map_cache,
 337                                  &ip.h, &ipm->h,
 338                                  hash_str(ipm->m_class, IP_HASHBITS) ^
 339                                  hash_ip6(ipm->m_addr));
 340         if (!ch)
 341                 return -ENOMEM;
 342         cache_put(ch, &ip_map_cache);
 343         return 0;
 344 }
 345
 346 int auth_unix_add_addr(struct in6_addr *addr, struct auth_domain *dom)
 347 {
 348         struct unix_domain *udom;
 349         struct ip_map *ipmp;
 350
 351         if (dom->flavour != &svcauth_unix)
 352                 return -EINVAL;
 353         udom = container_of(dom, struct unix_domain, h);
 354         ipmp = ip_map_lookup("nfsd", addr);
 355
 356         if (ipmp)
 357                 return ip_map_update(ipmp, udom, NEVER);
 358         else
 359                 return -ENOMEM;
 360 }
 361 EXPORT_SYMBOL_GPL(auth_unix_add_addr);
 362
 363 int auth_unix_forget_old(struct auth_domain *dom)
 364 {
 365         struct unix_domain *udom;
 366
 367         if (dom->flavour != &svcauth_unix)
 368                 return -EINVAL;
 369         udom = container_of(dom, struct unix_domain, h);
 370         udom->addr_changes++;
 371         return 0;
 372 }
 373 EXPORT_SYMBOL_GPL(auth_unix_forget_old);
 374
 375 struct auth_domain *auth_unix_lookup(struct in6_addr *addr)
 376 {
 377         struct ip_map *ipm;
 378         struct auth_domain *rv;
 379
 380         ipm = ip_map_lookup("nfsd", addr);
 381
 382         if (!ipm)
 383                 return NULL;
 384         if (cache_check(&ip_map_cache, &ipm->h, NULL))
 385                 return NULL;
 386
 387         if ((ipm->m_client->addr_changes - ipm->m_add_change) >0) {
 388                 if (test_and_set_bit(CACHE_NEGATIVE, &ipm->h.flags) == 0)
 389                         auth_domain_put(&ipm->m_client->h);
 390                 rv = NULL;
 391         } else {
 392                 rv = &ipm->m_client->h;
 393                 kref_get(&rv->ref);
 394         }
 395         cache_put(&ipm->h, &ip_map_cache);
 396         return rv;
 397 }
 398 EXPORT_SYMBOL_GPL(auth_unix_lookup);
 399
 400 void svcauth_unix_purge(void)
 401 {
 402         cache_purge(&ip_map_cache);
 403 }
 404 EXPORT_SYMBOL_GPL(svcauth_unix_purge);
 405
 406 static inline struct ip_map *
 407 ip_map_cached_get(struct svc_rqst *rqstp)
 408 {
 409         struct ip_map *ipm = NULL;
 410         struct svc_xprt *xprt = rqstp->rq_xprt;
 411
 412         if (test_bit(XPT_CACHE_AUTH, &xprt->xpt_flags)) {
 413                 spin_lock(&xprt->xpt_lock);
 414                 ipm = xprt->xpt_auth_cache;
 415                 if (ipm != NULL) {
 416                         if (!cache_valid(&ipm->h)) {
 417                                 /*
 418                                  * The entry has been invalidated since it was
 419                                  * remembered, e.g. by a second mount from the
 420                                  * same IP address.
 421                                  */
 422                                 xprt->xpt_auth_cache = NULL;
 423                                 spin_unlock(&xprt->xpt_lock);
 424                                 cache_put(&ipm->h, &ip_map_cache);
 425                                 return NULL;
 426                         }
 427                         cache_get(&ipm->h);
 428                 }
 429                 spin_unlock(&xprt->xpt_lock);
 430         }
 431         return ipm;
 432 }
 433
 434 static inline void
 435 ip_map_cached_put(struct svc_rqst *rqstp, struct ip_map *ipm)
 436 {
 437         struct svc_xprt *xprt = rqstp->rq_xprt;
 438
 439         if (test_bit(XPT_CACHE_AUTH, &xprt->xpt_flags)) {
 440                 spin_lock(&xprt->xpt_lock);
 441                 if (xprt->xpt_auth_cache == NULL) {
 442                         /* newly cached, keep the reference */
 443                         xprt->xpt_auth_cache = ipm;
 444                         ipm = NULL;
 445                 }
 446                 spin_unlock(&xprt->xpt_lock);
 447         }
 448         if (ipm)
 449                 cache_put(&ipm->h, &ip_map_cache);
 450 }
 451
 452 void
 453 svcauth_unix_info_release(void *info)
 454 {
 455         struct ip_map *ipm = info;
 456         cache_put(&ipm->h, &ip_map_cache);
 457 }
 458
 459 /****************************************************************************
 460  * auth.unix.gid cache
 461  * simple cache to map a UID to a list of GIDs
 462  * because AUTH_UNIX aka AUTH_SYS has a max of 16
 463  */
 464 #define GID_HASHBITS    8
 465 #define GID_HASHMAX     (1<<GID_HASHBITS)
 466 #define GID_HASHMASK    (GID_HASHMAX - 1)
 467
 468 struct unix_gid {
 469         struct cache_head       h;
 470         uid_t                   uid;
 471         struct group_info       *gi;
 472 };
 473 static struct cache_head        *gid_table[GID_HASHMAX];
 474
 475 static void unix_gid_put(struct kref *kref)
 476 {
 477         struct cache_head *item = container_of(kref, struct cache_head, ref);
 478         struct unix_gid *ug = container_of(item, struct unix_gid, h);
 479         if (test_bit(CACHE_VALID, &item->flags) &&
 480             !test_bit(CACHE_NEGATIVE, &item->flags))
 481                 put_group_info(ug->gi);
 482         kfree(ug);
 483 }
 484
 485 static int unix_gid_match(struct cache_head *corig, struct cache_head *cnew)
 486 {
 487         struct unix_gid *orig = container_of(corig, struct unix_gid, h);
 488         struct unix_gid *new = container_of(cnew, struct unix_gid, h);
 489         return orig->uid == new->uid;
 490 }
 491 static void unix_gid_init(struct cache_head *cnew, struct cache_head *citem)
 492 {
 493         struct unix_gid *new = container_of(cnew, struct unix_gid, h);
 494         struct unix_gid *item = container_of(citem, struct unix_gid, h);
 495         new->uid = item->uid;
 496 }
 497 static void unix_gid_update(struct cache_head *cnew, struct cache_head *citem)
 498 {
 499         struct unix_gid *new = container_of(cnew, struct unix_gid, h);
 500         struct unix_gid *item = container_of(citem, struct unix_gid, h);
 501
 502         get_group_info(item->gi);
 503         new->gi = item->gi;
 504 }
 505 static struct cache_head *unix_gid_alloc(void)
 506 {
 507         struct unix_gid *g = kmalloc(sizeof(*g), GFP_KERNEL);
 508         if (g)
 509                 return &g->h;
 510         else
 511                 return NULL;
 512 }
 513
 514 static void unix_gid_request(struct cache_detail *cd,
 515                              struct cache_head *h,
 516                              char **bpp, int *blen)
 517 {
 518         char tuid[20];
 519         struct unix_gid *ug = container_of(h, struct unix_gid, h);
 520
 521         snprintf(tuid, 20, "%u", ug->uid);
 522         qword_add(bpp, blen, tuid);
 523         (*bpp)[-1] = '\n';
 524 }
 525
 526 static struct unix_gid *unix_gid_lookup(uid_t uid);
 527 extern struct cache_detail unix_gid_cache;
 528
 529 static int unix_gid_parse(struct cache_detail *cd,
 530                         char *mesg, int mlen)
 531 {
 532         /* uid expiry Ngid gid0 gid1 ... gidN-1 */
 533         int uid;
 534         int gids;
 535         int rv;
 536         int i;
 537         int err;
 538         time_t expiry;
 539         struct unix_gid ug, *ugp;
 540
 541         if (mlen <= 0 || mesg[mlen-1] != '\n')
 542                 return -EINVAL;
 543         mesg[mlen-1] = 0;
 544
 545         rv = get_int(&mesg, &uid);
 546         if (rv)
 547                 return -EINVAL;
 548         ug.uid = uid;
 549
 550         expiry = get_expiry(&mesg);
 551         if (expiry == 0)
 552                 return -EINVAL;
 553
 554         rv = get_int(&mesg, &gids);
 555         if (rv || gids < 0 || gids > 8192)
 556                 return -EINVAL;
 557
 558         ug.gi = groups_alloc(gids);
 559         if (!ug.gi)
 560                 return -ENOMEM;
 561
 562         for (i = 0 ; i < gids ; i++) {
 563                 int gid;
 564                 rv = get_int(&mesg, &gid);
 565                 err = -EINVAL;
 566                 if (rv)
 567                         goto out;
 568                 GROUP_AT(ug.gi, i) = gid;
 569         }
 570
 571         ugp = unix_gid_lookup(uid);
 572         if (ugp) {
 573                 struct cache_head *ch;
 574                 ug.h.flags = 0;
 575                 ug.h.expiry_time = expiry;
 576                 ch = sunrpc_cache_update(&unix_gid_cache,
 577                                          &ug.h, &ugp->h,
 578                                          hash_long(uid, GID_HASHBITS));
 579                 if (!ch)
 580                         err = -ENOMEM;
 581                 else {
 582                         err = 0;
 583                         cache_put(ch, &unix_gid_cache);
 584                 }
 585         } else
 586                 err = -ENOMEM;
 587  out:
 588         if (ug.gi)
 589                 put_group_info(ug.gi);
 590         return err;
 591 }
 592
 593 static int unix_gid_show(struct seq_file *m,
 594                          struct cache_detail *cd,
 595                          struct cache_head *h)
 596 {
 597         struct unix_gid *ug;
 598         int i;
 599         int glen;
 600
 601         if (h == NULL) {
 602                 seq_puts(m, "#uid cnt: gids...\n");
 603                 return 0;
 604         }
 605         ug = container_of(h, struct unix_gid, h);
 606         if (test_bit(CACHE_VALID, &h->flags) &&
 607             !test_bit(CACHE_NEGATIVE, &h->flags))
 608                 glen = ug->gi->ngroups;
 609         else
 610                 glen = 0;
 611
 612         seq_printf(m, "%d %d:", ug->uid, glen);
 613         for (i = 0; i < glen; i++)
 614                 seq_printf(m, " %d", GROUP_AT(ug->gi, i));
 615         seq_printf(m, "\n");
 616         return 0;
 617 }
 618
 619 struct cache_detail unix_gid_cache = {
 620         .owner          = THIS_MODULE,
 621         .hash_size      = GID_HASHMAX,
 622         .hash_table     = gid_table,
 623         .name           = "auth.unix.gid",
 624         .cache_put      = unix_gid_put,
 625         .cache_request  = unix_gid_request,
 626         .cache_parse    = unix_gid_parse,
 627         .cache_show     = unix_gid_show,
 628         .match          = unix_gid_match,
 629         .init           = unix_gid_init,
 630         .update         = unix_gid_update,
 631         .alloc          = unix_gid_alloc,
 632 };
 633
 634 static struct unix_gid *unix_gid_lookup(uid_t uid)
 635 {
 636         struct unix_gid ug;
 637         struct cache_head *ch;
 638
 639         ug.uid = uid;
 640         ch = sunrpc_cache_lookup(&unix_gid_cache, &ug.h,
 641                                  hash_long(uid, GID_HASHBITS));
 642         if (ch)
 643                 return container_of(ch, struct unix_gid, h);
 644         else
 645                 return NULL;
 646 }
 647
 648 static int unix_gid_find(uid_t uid, struct group_info **gip,
 649                          struct svc_rqst *rqstp)
 650 {
 651         struct unix_gid *ug = unix_gid_lookup(uid);
 652         if (!ug)
 653                 return -EAGAIN;
 654         switch (cache_check(&unix_gid_cache, &ug->h, &rqstp->rq_chandle)) {
 655         case -ENOENT:
 656                 *gip = NULL;
 657                 return 0;
 658         case 0:
 659                 *gip = ug->gi;
 660                 get_group_info(*gip);
 661                 return 0;
 662         default:
 663                 return -EAGAIN;
 664         }
 665 }
 666
 667 int
 668 svcauth_unix_set_client(struct svc_rqst *rqstp)
 669 {
 670         struct sockaddr_in *sin;
 671         struct sockaddr_in6 *sin6, sin6_storage;
 672         struct ip_map *ipm;
 673
 674         switch (rqstp->rq_addr.ss_family) {
 675         case AF_INET:
 676                 sin = svc_addr_in(rqstp);
 677                 sin6 = &sin6_storage;
 678                 ipv6_addr_set(&sin6->sin6_addr, 0, 0,
 679                                 htonl(0x0000FFFF), sin->sin_addr.s_addr);
 680                 break;
 681         case AF_INET6:
 682                 sin6 = svc_addr_in6(rqstp);
 683                 break;
 684         default:
 685                 BUG();
 686         }
 687
 688         rqstp->rq_client = NULL;
 689         if (rqstp->rq_proc == 0)
 690                 return SVC_OK;
 691
 692         ipm = ip_map_cached_get(rqstp);
 693         if (ipm == NULL)
 694                 ipm = ip_map_lookup(rqstp->rq_server->sv_program->pg_class,
 695                                     &sin6->sin6_addr);
 696
 697         if (ipm == NULL)
 698                 return SVC_DENIED;
 699
 700         switch (cache_check(&ip_map_cache, &ipm->h, &rqstp->rq_chandle)) {
 701                 default:
 702                         BUG();
 703                 case -EAGAIN:
 704                 case -ETIMEDOUT:
 705                         return SVC_DROP;
 706                 case -ENOENT:
 707                         return SVC_DENIED;
 708                 case 0:
 709                         rqstp->rq_client = &ipm->m_client->h;
 710                         kref_get(&rqstp->rq_client->ref);
 711                         ip_map_cached_put(rqstp, ipm);
 712                         break;
 713         }
 714         return SVC_OK;
 715 }
 716
 717 EXPORT_SYMBOL_GPL(svcauth_unix_set_client);
 718
 719 static int
 720 svcauth_null_accept(struct svc_rqst *rqstp, __be32 *authp)
 721 {
 722         struct kvec     *argv = &rqstp->rq_arg.head[0];
 723         struct kvec     *resv = &rqstp->rq_res.head[0];
 724         struct svc_cred *cred = &rqstp->rq_cred;
 725
 726         cred->cr_group_info = NULL;
 727         rqstp->rq_client = NULL;
 728
 729         if (argv->iov_len < 3*4)
 730                 return SVC_GARBAGE;
 731
 732         if (svc_getu32(argv) != 0) {
 733                 dprintk("svc: bad null cred\n");
 734                 *authp = rpc_autherr_badcred;
 735                 return SVC_DENIED;
 736         }
 737         if (svc_getu32(argv) != htonl(RPC_AUTH_NULL) || svc_getu32(argv) != 0) {
 738                 dprintk("svc: bad null verf\n");
 739                 *authp = rpc_autherr_badverf;
 740                 return SVC_DENIED;
 741         }
 742
 743         /* Signal that mapping to nobody uid/gid is required */
 744         cred->cr_uid = (uid_t) -1;
 745         cred->cr_gid = (gid_t) -1;
 746         cred->cr_group_info = groups_alloc(0);
 747         if (cred->cr_group_info == NULL)
 748                 return SVC_DROP; /* kmalloc failure - client must retry */
 749
 750         /* Put NULL verifier */
 751         svc_putnl(resv, RPC_AUTH_NULL);
 752         svc_putnl(resv, 0);
 753
 754         rqstp->rq_flavor = RPC_AUTH_NULL;
 755         return SVC_OK;
 756 }
 757
 758 static int
 759 svcauth_null_release(struct svc_rqst *rqstp)
 760 {
 761         if (rqstp->rq_client)
 762                 auth_domain_put(rqstp->rq_client);
 763         rqstp->rq_client = NULL;
 764         if (rqstp->rq_cred.cr_group_info)
 765                 put_group_info(rqstp->rq_cred.cr_group_info);
 766         rqstp->rq_cred.cr_group_info = NULL;
 767
 768         return 0; /* don't drop */
 769 }
 770
 771
 772 struct auth_ops svcauth_null = {
 773         .name           = "null",
 774         .owner          = THIS_MODULE,
 775         .flavour        = RPC_AUTH_NULL,
 776         .accept         = svcauth_null_accept,
 777         .release        = svcauth_null_release,
 778         .set_client     = svcauth_unix_set_client,
 779 };
 780
 781
 782 static int
 783 svcauth_unix_accept(struct svc_rqst *rqstp, __be32 *authp)
 784 {
 785         struct kvec     *argv = &rqstp->rq_arg.head[0];
 786         struct kvec     *resv = &rqstp->rq_res.head[0];
 787         struct svc_cred *cred = &rqstp->rq_cred;
 788         u32             slen, i;
 789         int             len   = argv->iov_len;
 790
 791         cred->cr_group_info = NULL;
 792         rqstp->rq_client = NULL;
 793
 794         if ((len -= 3*4) < 0)
 795                 return SVC_GARBAGE;
 796
 797         svc_getu32(argv);                       /* length */
 798         svc_getu32(argv);                       /* time stamp */
 799         slen = XDR_QUADLEN(svc_getnl(argv));    /* machname length */
 800         if (slen > 64 || (len -= (slen + 3)*4) < 0)
 801                 goto badcred;
 802         argv->iov_base = (void*)((__be32*)argv->iov_base + slen);       /* skip machname */
 803         argv->iov_len -= slen*4;
 804
 805         cred->cr_uid = svc_getnl(argv);         /* uid */
 806         cred->cr_gid = svc_getnl(argv);         /* gid */
 807         slen = svc_getnl(argv);                 /* gids length */
 808         if (slen > 16 || (len -= (slen + 2)*4) < 0)
 809                 goto badcred;
 810         if (unix_gid_find(cred->cr_uid, &cred->cr_group_info, rqstp)
 811             == -EAGAIN)
 812                 return SVC_DROP;
 813         if (cred->cr_group_info == NULL) {
 814                 cred->cr_group_info = groups_alloc(slen);
 815                 if (cred->cr_group_info == NULL)
 816                         return SVC_DROP;
 817                 for (i = 0; i < slen; i++)
 818                         GROUP_AT(cred->cr_group_info, i) = svc_getnl(argv);
 819         } else {
 820                 for (i = 0; i < slen ; i++)
 821                         svc_getnl(argv);
 822         }
 823         if (svc_getu32(argv) != htonl(RPC_AUTH_NULL) || svc_getu32(argv) != 0) {
 824                 *authp = rpc_autherr_badverf;
 825                 return SVC_DENIED;
 826         }
 827
 828         /* Put NULL verifier */
 829         svc_putnl(resv, RPC_AUTH_NULL);
 830         svc_putnl(resv, 0);
 831
 832         rqstp->rq_flavor = RPC_AUTH_UNIX;
 833         return SVC_OK;
 834
 835 badcred:
 836         *authp = rpc_autherr_badcred;
 837         return SVC_DENIED;
 838 }
 839
 840 static int
 841 svcauth_unix_release(struct svc_rqst *rqstp)
 842 {
 843         /* Verifier (such as it is) is already in place.
 844          */
 845         if (rqstp->rq_client)
 846                 auth_domain_put(rqstp->rq_client);
 847         rqstp->rq_client = NULL;
 848         if (rqstp->rq_cred.cr_group_info)
 849                 put_group_info(rqstp->rq_cred.cr_group_info);
 850         rqstp->rq_cred.cr_group_info = NULL;
 851
 852         return 0;
 853 }
 854
 855
 856 struct auth_ops svcauth_unix = {
 857         .name           = "unix",
 858         .owner          = THIS_MODULE,
 859         .flavour        = RPC_AUTH_UNIX,
 860         .accept         = svcauth_unix_accept,
 861         .release        = svcauth_unix_release,
 862         .domain_release = svcauth_unix_domain_release,
 863         .set_client     = svcauth_unix_set_client,
 864 };
 865