root/net/sunrpc/auth_gss/svcauth_gss.c

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DEFINITIONS

This source file includes following definitions.
  1. netobj_equal
  2. rsi_free
  3. rsi_free_rcu
  4. rsi_put
  5. rsi_hash
  6. rsi_match
  7. dup_to_netobj
  8. dup_netobj
  9. rsi_init
  10. update_rsi
  11. rsi_alloc
  12. rsi_request
  13. rsi_parse
  14. rsi_lookup
  15. rsi_update
  16. rsc_free
  17. rsc_free_rcu
  18. rsc_put
  19. rsc_hash
  20. rsc_match
  21. rsc_init
  22. update_rsc
  23. rsc_alloc
  24. rsc_parse
  25. rsc_lookup
  26. rsc_update
  27. gss_svc_searchbyctx
  28. gss_check_seq_num
  29. round_up_to_quad
  30. svc_safe_getnetobj
  31. svc_safe_putnetobj
  32. gss_verify_header
  33. gss_write_null_verf
  34. gss_write_verf
  35. find_gss_auth_domain
  36. svcauth_gss_flavor
  37. svcauth_gss_register_pseudoflavor
  38. read_u32_from_xdr_buf
  39. unwrap_integ_data
  40. total_buf_len
  41. fix_priv_head
  42. unwrap_priv_data
  43. svcauth_gss_set_client
  44. gss_write_init_verf
  45. gss_read_common_verf
  46. gss_read_verf
  47. gss_free_in_token_pages
  48. gss_read_proxy_verf
  49. gss_write_resv
  50. svcauth_gss_legacy_init
  51. gss_proxy_save_rsc
  52. svcauth_gss_proxy_init
  53. set_gss_proxy
  54. use_gss_proxy
  55. write_gssp
  56. read_gssp
  57. create_use_gss_proxy_proc_entry
  58. destroy_use_gss_proxy_proc_entry
  59. create_use_gss_proxy_proc_entry
  60. destroy_use_gss_proxy_proc_entry
  61. svcauth_gss_accept
  62. svcauth_gss_prepare_to_wrap
  63. svcauth_gss_wrap_resp_integ
  64. svcauth_gss_wrap_resp_priv
  65. svcauth_gss_release
  66. svcauth_gss_domain_release_rcu
  67. svcauth_gss_domain_release
  68. rsi_cache_create_net
  69. rsi_cache_destroy_net
  70. rsc_cache_create_net
  71. rsc_cache_destroy_net
  72. gss_svc_init_net
  73. gss_svc_shutdown_net
  74. gss_svc_init
  75. gss_svc_shutdown

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Neil Brown <neilb@cse.unsw.edu.au>
   4  * J. Bruce Fields <bfields@umich.edu>
   5  * Andy Adamson <andros@umich.edu>
   6  * Dug Song <dugsong@monkey.org>
   7  *
   8  * RPCSEC_GSS server authentication.
   9  * This implements RPCSEC_GSS as defined in rfc2203 (rpcsec_gss) and rfc2078
  10  * (gssapi)
  11  *
  12  * The RPCSEC_GSS involves three stages:
  13  *  1/ context creation
  14  *  2/ data exchange
  15  *  3/ context destruction
  16  *
  17  * Context creation is handled largely by upcalls to user-space.
  18  *  In particular, GSS_Accept_sec_context is handled by an upcall
  19  * Data exchange is handled entirely within the kernel
  20  *  In particular, GSS_GetMIC, GSS_VerifyMIC, GSS_Seal, GSS_Unseal are in-kernel.
  21  * Context destruction is handled in-kernel
  22  *  GSS_Delete_sec_context is in-kernel
  23  *
  24  * Context creation is initiated by a RPCSEC_GSS_INIT request arriving.
  25  * The context handle and gss_token are used as a key into the rpcsec_init cache.
  26  * The content of this cache includes some of the outputs of GSS_Accept_sec_context,
  27  * being major_status, minor_status, context_handle, reply_token.
  28  * These are sent back to the client.
  29  * Sequence window management is handled by the kernel.  The window size if currently
  30  * a compile time constant.
  31  *
  32  * When user-space is happy that a context is established, it places an entry
  33  * in the rpcsec_context cache. The key for this cache is the context_handle.
  34  * The content includes:
  35  *   uid/gidlist - for determining access rights
  36  *   mechanism type
  37  *   mechanism specific information, such as a key
  38  *
  39  */
  40 
  41 #include <linux/slab.h>
  42 #include <linux/types.h>
  43 #include <linux/module.h>
  44 #include <linux/pagemap.h>
  45 #include <linux/user_namespace.h>
  46 
  47 #include <linux/sunrpc/auth_gss.h>
  48 #include <linux/sunrpc/gss_err.h>
  49 #include <linux/sunrpc/svcauth.h>
  50 #include <linux/sunrpc/svcauth_gss.h>
  51 #include <linux/sunrpc/cache.h>
  52 #include "gss_rpc_upcall.h"
  53 
  54 
  55 #if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
  56 # define RPCDBG_FACILITY        RPCDBG_AUTH
  57 #endif
  58 
  59 /* The rpcsec_init cache is used for mapping RPCSEC_GSS_{,CONT_}INIT requests
  60  * into replies.
  61  *
  62  * Key is context handle (\x if empty) and gss_token.
  63  * Content is major_status minor_status (integers) context_handle, reply_token.
  64  *
  65  */
  66 
  67 static int netobj_equal(struct xdr_netobj *a, struct xdr_netobj *b)
  68 {
  69         return a->len == b->len && 0 == memcmp(a->data, b->data, a->len);
  70 }
  71 
  72 #define RSI_HASHBITS    6
  73 #define RSI_HASHMAX     (1<<RSI_HASHBITS)
  74 
  75 struct rsi {
  76         struct cache_head       h;
  77         struct xdr_netobj       in_handle, in_token;
  78         struct xdr_netobj       out_handle, out_token;
  79         int                     major_status, minor_status;
  80         struct rcu_head         rcu_head;
  81 };
  82 
  83 static struct rsi *rsi_update(struct cache_detail *cd, struct rsi *new, struct rsi *old);
  84 static struct rsi *rsi_lookup(struct cache_detail *cd, struct rsi *item);
  85 
  86 static void rsi_free(struct rsi *rsii)
  87 {
  88         kfree(rsii->in_handle.data);
  89         kfree(rsii->in_token.data);
  90         kfree(rsii->out_handle.data);
  91         kfree(rsii->out_token.data);
  92 }
  93 
  94 static void rsi_free_rcu(struct rcu_head *head)
  95 {
  96         struct rsi *rsii = container_of(head, struct rsi, rcu_head);
  97 
  98         rsi_free(rsii);
  99         kfree(rsii);
 100 }
 101 
 102 static void rsi_put(struct kref *ref)
 103 {
 104         struct rsi *rsii = container_of(ref, struct rsi, h.ref);
 105 
 106         call_rcu(&rsii->rcu_head, rsi_free_rcu);
 107 }
 108 
 109 static inline int rsi_hash(struct rsi *item)
 110 {
 111         return hash_mem(item->in_handle.data, item->in_handle.len, RSI_HASHBITS)
 112              ^ hash_mem(item->in_token.data, item->in_token.len, RSI_HASHBITS);
 113 }
 114 
 115 static int rsi_match(struct cache_head *a, struct cache_head *b)
 116 {
 117         struct rsi *item = container_of(a, struct rsi, h);
 118         struct rsi *tmp = container_of(b, struct rsi, h);
 119         return netobj_equal(&item->in_handle, &tmp->in_handle) &&
 120                netobj_equal(&item->in_token, &tmp->in_token);
 121 }
 122 
 123 static int dup_to_netobj(struct xdr_netobj *dst, char *src, int len)
 124 {
 125         dst->len = len;
 126         dst->data = (len ? kmemdup(src, len, GFP_KERNEL) : NULL);
 127         if (len && !dst->data)
 128                 return -ENOMEM;
 129         return 0;
 130 }
 131 
 132 static inline int dup_netobj(struct xdr_netobj *dst, struct xdr_netobj *src)
 133 {
 134         return dup_to_netobj(dst, src->data, src->len);
 135 }
 136 
 137 static void rsi_init(struct cache_head *cnew, struct cache_head *citem)
 138 {
 139         struct rsi *new = container_of(cnew, struct rsi, h);
 140         struct rsi *item = container_of(citem, struct rsi, h);
 141 
 142         new->out_handle.data = NULL;
 143         new->out_handle.len = 0;
 144         new->out_token.data = NULL;
 145         new->out_token.len = 0;
 146         new->in_handle.len = item->in_handle.len;
 147         item->in_handle.len = 0;
 148         new->in_token.len = item->in_token.len;
 149         item->in_token.len = 0;
 150         new->in_handle.data = item->in_handle.data;
 151         item->in_handle.data = NULL;
 152         new->in_token.data = item->in_token.data;
 153         item->in_token.data = NULL;
 154 }
 155 
 156 static void update_rsi(struct cache_head *cnew, struct cache_head *citem)
 157 {
 158         struct rsi *new = container_of(cnew, struct rsi, h);
 159         struct rsi *item = container_of(citem, struct rsi, h);
 160 
 161         BUG_ON(new->out_handle.data || new->out_token.data);
 162         new->out_handle.len = item->out_handle.len;
 163         item->out_handle.len = 0;
 164         new->out_token.len = item->out_token.len;
 165         item->out_token.len = 0;
 166         new->out_handle.data = item->out_handle.data;
 167         item->out_handle.data = NULL;
 168         new->out_token.data = item->out_token.data;
 169         item->out_token.data = NULL;
 170 
 171         new->major_status = item->major_status;
 172         new->minor_status = item->minor_status;
 173 }
 174 
 175 static struct cache_head *rsi_alloc(void)
 176 {
 177         struct rsi *rsii = kmalloc(sizeof(*rsii), GFP_KERNEL);
 178         if (rsii)
 179                 return &rsii->h;
 180         else
 181                 return NULL;
 182 }
 183 
 184 static void rsi_request(struct cache_detail *cd,
 185                        struct cache_head *h,
 186                        char **bpp, int *blen)
 187 {
 188         struct rsi *rsii = container_of(h, struct rsi, h);
 189 
 190         qword_addhex(bpp, blen, rsii->in_handle.data, rsii->in_handle.len);
 191         qword_addhex(bpp, blen, rsii->in_token.data, rsii->in_token.len);
 192         (*bpp)[-1] = '\n';
 193 }
 194 
 195 static int rsi_parse(struct cache_detail *cd,
 196                     char *mesg, int mlen)
 197 {
 198         /* context token expiry major minor context token */
 199         char *buf = mesg;
 200         char *ep;
 201         int len;
 202         struct rsi rsii, *rsip = NULL;
 203         time_t expiry;
 204         int status = -EINVAL;
 205 
 206         memset(&rsii, 0, sizeof(rsii));
 207         /* handle */
 208         len = qword_get(&mesg, buf, mlen);
 209         if (len < 0)
 210                 goto out;
 211         status = -ENOMEM;
 212         if (dup_to_netobj(&rsii.in_handle, buf, len))
 213                 goto out;
 214 
 215         /* token */
 216         len = qword_get(&mesg, buf, mlen);
 217         status = -EINVAL;
 218         if (len < 0)
 219                 goto out;
 220         status = -ENOMEM;
 221         if (dup_to_netobj(&rsii.in_token, buf, len))
 222                 goto out;
 223 
 224         rsip = rsi_lookup(cd, &rsii);
 225         if (!rsip)
 226                 goto out;
 227 
 228         rsii.h.flags = 0;
 229         /* expiry */
 230         expiry = get_expiry(&mesg);
 231         status = -EINVAL;
 232         if (expiry == 0)
 233                 goto out;
 234 
 235         /* major/minor */
 236         len = qword_get(&mesg, buf, mlen);
 237         if (len <= 0)
 238                 goto out;
 239         rsii.major_status = simple_strtoul(buf, &ep, 10);
 240         if (*ep)
 241                 goto out;
 242         len = qword_get(&mesg, buf, mlen);
 243         if (len <= 0)
 244                 goto out;
 245         rsii.minor_status = simple_strtoul(buf, &ep, 10);
 246         if (*ep)
 247                 goto out;
 248 
 249         /* out_handle */
 250         len = qword_get(&mesg, buf, mlen);
 251         if (len < 0)
 252                 goto out;
 253         status = -ENOMEM;
 254         if (dup_to_netobj(&rsii.out_handle, buf, len))
 255                 goto out;
 256 
 257         /* out_token */
 258         len = qword_get(&mesg, buf, mlen);
 259         status = -EINVAL;
 260         if (len < 0)
 261                 goto out;
 262         status = -ENOMEM;
 263         if (dup_to_netobj(&rsii.out_token, buf, len))
 264                 goto out;
 265         rsii.h.expiry_time = expiry;
 266         rsip = rsi_update(cd, &rsii, rsip);
 267         status = 0;
 268 out:
 269         rsi_free(&rsii);
 270         if (rsip)
 271                 cache_put(&rsip->h, cd);
 272         else
 273                 status = -ENOMEM;
 274         return status;
 275 }
 276 
 277 static const struct cache_detail rsi_cache_template = {
 278         .owner          = THIS_MODULE,
 279         .hash_size      = RSI_HASHMAX,
 280         .name           = "auth.rpcsec.init",
 281         .cache_put      = rsi_put,
 282         .cache_request  = rsi_request,
 283         .cache_parse    = rsi_parse,
 284         .match          = rsi_match,
 285         .init           = rsi_init,
 286         .update         = update_rsi,
 287         .alloc          = rsi_alloc,
 288 };
 289 
 290 static struct rsi *rsi_lookup(struct cache_detail *cd, struct rsi *item)
 291 {
 292         struct cache_head *ch;
 293         int hash = rsi_hash(item);
 294 
 295         ch = sunrpc_cache_lookup_rcu(cd, &item->h, hash);
 296         if (ch)
 297                 return container_of(ch, struct rsi, h);
 298         else
 299                 return NULL;
 300 }
 301 
 302 static struct rsi *rsi_update(struct cache_detail *cd, struct rsi *new, struct rsi *old)
 303 {
 304         struct cache_head *ch;
 305         int hash = rsi_hash(new);
 306 
 307         ch = sunrpc_cache_update(cd, &new->h,
 308                                  &old->h, hash);
 309         if (ch)
 310                 return container_of(ch, struct rsi, h);
 311         else
 312                 return NULL;
 313 }
 314 
 315 
 316 /*
 317  * The rpcsec_context cache is used to store a context that is
 318  * used in data exchange.
 319  * The key is a context handle. The content is:
 320  *  uid, gidlist, mechanism, service-set, mech-specific-data
 321  */
 322 
 323 #define RSC_HASHBITS    10
 324 #define RSC_HASHMAX     (1<<RSC_HASHBITS)
 325 
 326 #define GSS_SEQ_WIN     128
 327 
 328 struct gss_svc_seq_data {
 329         /* highest seq number seen so far: */
 330         int                     sd_max;
 331         /* for i such that sd_max-GSS_SEQ_WIN < i <= sd_max, the i-th bit of
 332          * sd_win is nonzero iff sequence number i has been seen already: */
 333         unsigned long           sd_win[GSS_SEQ_WIN/BITS_PER_LONG];
 334         spinlock_t              sd_lock;
 335 };
 336 
 337 struct rsc {
 338         struct cache_head       h;
 339         struct xdr_netobj       handle;
 340         struct svc_cred         cred;
 341         struct gss_svc_seq_data seqdata;
 342         struct gss_ctx          *mechctx;
 343         struct rcu_head         rcu_head;
 344 };
 345 
 346 static struct rsc *rsc_update(struct cache_detail *cd, struct rsc *new, struct rsc *old);
 347 static struct rsc *rsc_lookup(struct cache_detail *cd, struct rsc *item);
 348 
 349 static void rsc_free(struct rsc *rsci)
 350 {
 351         kfree(rsci->handle.data);
 352         if (rsci->mechctx)
 353                 gss_delete_sec_context(&rsci->mechctx);
 354         free_svc_cred(&rsci->cred);
 355 }
 356 
 357 static void rsc_free_rcu(struct rcu_head *head)
 358 {
 359         struct rsc *rsci = container_of(head, struct rsc, rcu_head);
 360 
 361         kfree(rsci->handle.data);
 362         kfree(rsci);
 363 }
 364 
 365 static void rsc_put(struct kref *ref)
 366 {
 367         struct rsc *rsci = container_of(ref, struct rsc, h.ref);
 368 
 369         if (rsci->mechctx)
 370                 gss_delete_sec_context(&rsci->mechctx);
 371         free_svc_cred(&rsci->cred);
 372         call_rcu(&rsci->rcu_head, rsc_free_rcu);
 373 }
 374 
 375 static inline int
 376 rsc_hash(struct rsc *rsci)
 377 {
 378         return hash_mem(rsci->handle.data, rsci->handle.len, RSC_HASHBITS);
 379 }
 380 
 381 static int
 382 rsc_match(struct cache_head *a, struct cache_head *b)
 383 {
 384         struct rsc *new = container_of(a, struct rsc, h);
 385         struct rsc *tmp = container_of(b, struct rsc, h);
 386 
 387         return netobj_equal(&new->handle, &tmp->handle);
 388 }
 389 
 390 static void
 391 rsc_init(struct cache_head *cnew, struct cache_head *ctmp)
 392 {
 393         struct rsc *new = container_of(cnew, struct rsc, h);
 394         struct rsc *tmp = container_of(ctmp, struct rsc, h);
 395 
 396         new->handle.len = tmp->handle.len;
 397         tmp->handle.len = 0;
 398         new->handle.data = tmp->handle.data;
 399         tmp->handle.data = NULL;
 400         new->mechctx = NULL;
 401         init_svc_cred(&new->cred);
 402 }
 403 
 404 static void
 405 update_rsc(struct cache_head *cnew, struct cache_head *ctmp)
 406 {
 407         struct rsc *new = container_of(cnew, struct rsc, h);
 408         struct rsc *tmp = container_of(ctmp, struct rsc, h);
 409 
 410         new->mechctx = tmp->mechctx;
 411         tmp->mechctx = NULL;
 412         memset(&new->seqdata, 0, sizeof(new->seqdata));
 413         spin_lock_init(&new->seqdata.sd_lock);
 414         new->cred = tmp->cred;
 415         init_svc_cred(&tmp->cred);
 416 }
 417 
 418 static struct cache_head *
 419 rsc_alloc(void)
 420 {
 421         struct rsc *rsci = kmalloc(sizeof(*rsci), GFP_KERNEL);
 422         if (rsci)
 423                 return &rsci->h;
 424         else
 425                 return NULL;
 426 }
 427 
 428 static int rsc_parse(struct cache_detail *cd,
 429                      char *mesg, int mlen)
 430 {
 431         /* contexthandle expiry [ uid gid N <n gids> mechname ...mechdata... ] */
 432         char *buf = mesg;
 433         int id;
 434         int len, rv;
 435         struct rsc rsci, *rscp = NULL;
 436         time_t expiry;
 437         int status = -EINVAL;
 438         struct gss_api_mech *gm = NULL;
 439 
 440         memset(&rsci, 0, sizeof(rsci));
 441         /* context handle */
 442         len = qword_get(&mesg, buf, mlen);
 443         if (len < 0) goto out;
 444         status = -ENOMEM;
 445         if (dup_to_netobj(&rsci.handle, buf, len))
 446                 goto out;
 447 
 448         rsci.h.flags = 0;
 449         /* expiry */
 450         expiry = get_expiry(&mesg);
 451         status = -EINVAL;
 452         if (expiry == 0)
 453                 goto out;
 454 
 455         rscp = rsc_lookup(cd, &rsci);
 456         if (!rscp)
 457                 goto out;
 458 
 459         /* uid, or NEGATIVE */
 460         rv = get_int(&mesg, &id);
 461         if (rv == -EINVAL)
 462                 goto out;
 463         if (rv == -ENOENT)
 464                 set_bit(CACHE_NEGATIVE, &rsci.h.flags);
 465         else {
 466                 int N, i;
 467 
 468                 /*
 469                  * NOTE: we skip uid_valid()/gid_valid() checks here:
 470                  * instead, * -1 id's are later mapped to the
 471                  * (export-specific) anonymous id by nfsd_setuser.
 472                  *
 473                  * (But supplementary gid's get no such special
 474                  * treatment so are checked for validity here.)
 475                  */
 476                 /* uid */
 477                 rsci.cred.cr_uid = make_kuid(current_user_ns(), id);
 478 
 479                 /* gid */
 480                 if (get_int(&mesg, &id))
 481                         goto out;
 482                 rsci.cred.cr_gid = make_kgid(current_user_ns(), id);
 483 
 484                 /* number of additional gid's */
 485                 if (get_int(&mesg, &N))
 486                         goto out;
 487                 if (N < 0 || N > NGROUPS_MAX)
 488                         goto out;
 489                 status = -ENOMEM;
 490                 rsci.cred.cr_group_info = groups_alloc(N);
 491                 if (rsci.cred.cr_group_info == NULL)
 492                         goto out;
 493 
 494                 /* gid's */
 495                 status = -EINVAL;
 496                 for (i=0; i<N; i++) {
 497                         kgid_t kgid;
 498                         if (get_int(&mesg, &id))
 499                                 goto out;
 500                         kgid = make_kgid(current_user_ns(), id);
 501                         if (!gid_valid(kgid))
 502                                 goto out;
 503                         rsci.cred.cr_group_info->gid[i] = kgid;
 504                 }
 505                 groups_sort(rsci.cred.cr_group_info);
 506 
 507                 /* mech name */
 508                 len = qword_get(&mesg, buf, mlen);
 509                 if (len < 0)
 510                         goto out;
 511                 gm = rsci.cred.cr_gss_mech = gss_mech_get_by_name(buf);
 512                 status = -EOPNOTSUPP;
 513                 if (!gm)
 514                         goto out;
 515 
 516                 status = -EINVAL;
 517                 /* mech-specific data: */
 518                 len = qword_get(&mesg, buf, mlen);
 519                 if (len < 0)
 520                         goto out;
 521                 status = gss_import_sec_context(buf, len, gm, &rsci.mechctx,
 522                                                 NULL, GFP_KERNEL);
 523                 if (status)
 524                         goto out;
 525 
 526                 /* get client name */
 527                 len = qword_get(&mesg, buf, mlen);
 528                 if (len > 0) {
 529                         rsci.cred.cr_principal = kstrdup(buf, GFP_KERNEL);
 530                         if (!rsci.cred.cr_principal) {
 531                                 status = -ENOMEM;
 532                                 goto out;
 533                         }
 534                 }
 535 
 536         }
 537         rsci.h.expiry_time = expiry;
 538         rscp = rsc_update(cd, &rsci, rscp);
 539         status = 0;
 540 out:
 541         rsc_free(&rsci);
 542         if (rscp)
 543                 cache_put(&rscp->h, cd);
 544         else
 545                 status = -ENOMEM;
 546         return status;
 547 }
 548 
 549 static const struct cache_detail rsc_cache_template = {
 550         .owner          = THIS_MODULE,
 551         .hash_size      = RSC_HASHMAX,
 552         .name           = "auth.rpcsec.context",
 553         .cache_put      = rsc_put,
 554         .cache_parse    = rsc_parse,
 555         .match          = rsc_match,
 556         .init           = rsc_init,
 557         .update         = update_rsc,
 558         .alloc          = rsc_alloc,
 559 };
 560 
 561 static struct rsc *rsc_lookup(struct cache_detail *cd, struct rsc *item)
 562 {
 563         struct cache_head *ch;
 564         int hash = rsc_hash(item);
 565 
 566         ch = sunrpc_cache_lookup_rcu(cd, &item->h, hash);
 567         if (ch)
 568                 return container_of(ch, struct rsc, h);
 569         else
 570                 return NULL;
 571 }
 572 
 573 static struct rsc *rsc_update(struct cache_detail *cd, struct rsc *new, struct rsc *old)
 574 {
 575         struct cache_head *ch;
 576         int hash = rsc_hash(new);
 577 
 578         ch = sunrpc_cache_update(cd, &new->h,
 579                                  &old->h, hash);
 580         if (ch)
 581                 return container_of(ch, struct rsc, h);
 582         else
 583                 return NULL;
 584 }
 585 
 586 
 587 static struct rsc *
 588 gss_svc_searchbyctx(struct cache_detail *cd, struct xdr_netobj *handle)
 589 {
 590         struct rsc rsci;
 591         struct rsc *found;
 592 
 593         memset(&rsci, 0, sizeof(rsci));
 594         if (dup_to_netobj(&rsci.handle, handle->data, handle->len))
 595                 return NULL;
 596         found = rsc_lookup(cd, &rsci);
 597         rsc_free(&rsci);
 598         if (!found)
 599                 return NULL;
 600         if (cache_check(cd, &found->h, NULL))
 601                 return NULL;
 602         return found;
 603 }
 604 
 605 /* Implements sequence number algorithm as specified in RFC 2203. */
 606 static int
 607 gss_check_seq_num(struct rsc *rsci, int seq_num)
 608 {
 609         struct gss_svc_seq_data *sd = &rsci->seqdata;
 610 
 611         spin_lock(&sd->sd_lock);
 612         if (seq_num > sd->sd_max) {
 613                 if (seq_num >= sd->sd_max + GSS_SEQ_WIN) {
 614                         memset(sd->sd_win,0,sizeof(sd->sd_win));
 615                         sd->sd_max = seq_num;
 616                 } else while (sd->sd_max < seq_num) {
 617                         sd->sd_max++;
 618                         __clear_bit(sd->sd_max % GSS_SEQ_WIN, sd->sd_win);
 619                 }
 620                 __set_bit(seq_num % GSS_SEQ_WIN, sd->sd_win);
 621                 goto ok;
 622         } else if (seq_num <= sd->sd_max - GSS_SEQ_WIN) {
 623                 goto drop;
 624         }
 625         /* sd_max - GSS_SEQ_WIN < seq_num <= sd_max */
 626         if (__test_and_set_bit(seq_num % GSS_SEQ_WIN, sd->sd_win))
 627                 goto drop;
 628 ok:
 629         spin_unlock(&sd->sd_lock);
 630         return 1;
 631 drop:
 632         spin_unlock(&sd->sd_lock);
 633         return 0;
 634 }
 635 
 636 static inline u32 round_up_to_quad(u32 i)
 637 {
 638         return (i + 3 ) & ~3;
 639 }
 640 
 641 static inline int
 642 svc_safe_getnetobj(struct kvec *argv, struct xdr_netobj *o)
 643 {
 644         int l;
 645 
 646         if (argv->iov_len < 4)
 647                 return -1;
 648         o->len = svc_getnl(argv);
 649         l = round_up_to_quad(o->len);
 650         if (argv->iov_len < l)
 651                 return -1;
 652         o->data = argv->iov_base;
 653         argv->iov_base += l;
 654         argv->iov_len -= l;
 655         return 0;
 656 }
 657 
 658 static inline int
 659 svc_safe_putnetobj(struct kvec *resv, struct xdr_netobj *o)
 660 {
 661         u8 *p;
 662 
 663         if (resv->iov_len + 4 > PAGE_SIZE)
 664                 return -1;
 665         svc_putnl(resv, o->len);
 666         p = resv->iov_base + resv->iov_len;
 667         resv->iov_len += round_up_to_quad(o->len);
 668         if (resv->iov_len > PAGE_SIZE)
 669                 return -1;
 670         memcpy(p, o->data, o->len);
 671         memset(p + o->len, 0, round_up_to_quad(o->len) - o->len);
 672         return 0;
 673 }
 674 
 675 /*
 676  * Verify the checksum on the header and return SVC_OK on success.
 677  * Otherwise, return SVC_DROP (in the case of a bad sequence number)
 678  * or return SVC_DENIED and indicate error in authp.
 679  */
 680 static int
 681 gss_verify_header(struct svc_rqst *rqstp, struct rsc *rsci,
 682                   __be32 *rpcstart, struct rpc_gss_wire_cred *gc, __be32 *authp)
 683 {
 684         struct gss_ctx          *ctx_id = rsci->mechctx;
 685         struct xdr_buf          rpchdr;
 686         struct xdr_netobj       checksum;
 687         u32                     flavor = 0;
 688         struct kvec             *argv = &rqstp->rq_arg.head[0];
 689         struct kvec             iov;
 690 
 691         /* data to compute the checksum over: */
 692         iov.iov_base = rpcstart;
 693         iov.iov_len = (u8 *)argv->iov_base - (u8 *)rpcstart;
 694         xdr_buf_from_iov(&iov, &rpchdr);
 695 
 696         *authp = rpc_autherr_badverf;
 697         if (argv->iov_len < 4)
 698                 return SVC_DENIED;
 699         flavor = svc_getnl(argv);
 700         if (flavor != RPC_AUTH_GSS)
 701                 return SVC_DENIED;
 702         if (svc_safe_getnetobj(argv, &checksum))
 703                 return SVC_DENIED;
 704 
 705         if (rqstp->rq_deferred) /* skip verification of revisited request */
 706                 return SVC_OK;
 707         if (gss_verify_mic(ctx_id, &rpchdr, &checksum) != GSS_S_COMPLETE) {
 708                 *authp = rpcsec_gsserr_credproblem;
 709                 return SVC_DENIED;
 710         }
 711 
 712         if (gc->gc_seq > MAXSEQ) {
 713                 dprintk("RPC:       svcauth_gss: discarding request with "
 714                                 "large sequence number %d\n", gc->gc_seq);
 715                 *authp = rpcsec_gsserr_ctxproblem;
 716                 return SVC_DENIED;
 717         }
 718         if (!gss_check_seq_num(rsci, gc->gc_seq)) {
 719                 dprintk("RPC:       svcauth_gss: discarding request with "
 720                                 "old sequence number %d\n", gc->gc_seq);
 721                 return SVC_DROP;
 722         }
 723         return SVC_OK;
 724 }
 725 
 726 static int
 727 gss_write_null_verf(struct svc_rqst *rqstp)
 728 {
 729         __be32     *p;
 730 
 731         svc_putnl(rqstp->rq_res.head, RPC_AUTH_NULL);
 732         p = rqstp->rq_res.head->iov_base + rqstp->rq_res.head->iov_len;
 733         /* don't really need to check if head->iov_len > PAGE_SIZE ... */
 734         *p++ = 0;
 735         if (!xdr_ressize_check(rqstp, p))
 736                 return -1;
 737         return 0;
 738 }
 739 
 740 static int
 741 gss_write_verf(struct svc_rqst *rqstp, struct gss_ctx *ctx_id, u32 seq)
 742 {
 743         __be32                  *xdr_seq;
 744         u32                     maj_stat;
 745         struct xdr_buf          verf_data;
 746         struct xdr_netobj       mic;
 747         __be32                  *p;
 748         struct kvec             iov;
 749         int err = -1;
 750 
 751         svc_putnl(rqstp->rq_res.head, RPC_AUTH_GSS);
 752         xdr_seq = kmalloc(4, GFP_KERNEL);
 753         if (!xdr_seq)
 754                 return -1;
 755         *xdr_seq = htonl(seq);
 756 
 757         iov.iov_base = xdr_seq;
 758         iov.iov_len = 4;
 759         xdr_buf_from_iov(&iov, &verf_data);
 760         p = rqstp->rq_res.head->iov_base + rqstp->rq_res.head->iov_len;
 761         mic.data = (u8 *)(p + 1);
 762         maj_stat = gss_get_mic(ctx_id, &verf_data, &mic);
 763         if (maj_stat != GSS_S_COMPLETE)
 764                 goto out;
 765         *p++ = htonl(mic.len);
 766         memset((u8 *)p + mic.len, 0, round_up_to_quad(mic.len) - mic.len);
 767         p += XDR_QUADLEN(mic.len);
 768         if (!xdr_ressize_check(rqstp, p))
 769                 goto out;
 770         err = 0;
 771 out:
 772         kfree(xdr_seq);
 773         return err;
 774 }
 775 
 776 struct gss_domain {
 777         struct auth_domain      h;
 778         u32                     pseudoflavor;
 779 };
 780 
 781 static struct auth_domain *
 782 find_gss_auth_domain(struct gss_ctx *ctx, u32 svc)
 783 {
 784         char *name;
 785 
 786         name = gss_service_to_auth_domain_name(ctx->mech_type, svc);
 787         if (!name)
 788                 return NULL;
 789         return auth_domain_find(name);
 790 }
 791 
 792 static struct auth_ops svcauthops_gss;
 793 
 794 u32 svcauth_gss_flavor(struct auth_domain *dom)
 795 {
 796         struct gss_domain *gd = container_of(dom, struct gss_domain, h);
 797 
 798         return gd->pseudoflavor;
 799 }
 800 
 801 EXPORT_SYMBOL_GPL(svcauth_gss_flavor);
 802 
 803 int
 804 svcauth_gss_register_pseudoflavor(u32 pseudoflavor, char * name)
 805 {
 806         struct gss_domain       *new;
 807         struct auth_domain      *test;
 808         int                     stat = -ENOMEM;
 809 
 810         new = kmalloc(sizeof(*new), GFP_KERNEL);
 811         if (!new)
 812                 goto out;
 813         kref_init(&new->h.ref);
 814         new->h.name = kstrdup(name, GFP_KERNEL);
 815         if (!new->h.name)
 816                 goto out_free_dom;
 817         new->h.flavour = &svcauthops_gss;
 818         new->pseudoflavor = pseudoflavor;
 819 
 820         stat = 0;
 821         test = auth_domain_lookup(name, &new->h);
 822         if (test != &new->h) { /* Duplicate registration */
 823                 auth_domain_put(test);
 824                 kfree(new->h.name);
 825                 goto out_free_dom;
 826         }
 827         return 0;
 828 
 829 out_free_dom:
 830         kfree(new);
 831 out:
 832         return stat;
 833 }
 834 
 835 EXPORT_SYMBOL_GPL(svcauth_gss_register_pseudoflavor);
 836 
 837 static inline int
 838 read_u32_from_xdr_buf(struct xdr_buf *buf, int base, u32 *obj)
 839 {
 840         __be32  raw;
 841         int     status;
 842 
 843         status = read_bytes_from_xdr_buf(buf, base, &raw, sizeof(*obj));
 844         if (status)
 845                 return status;
 846         *obj = ntohl(raw);
 847         return 0;
 848 }
 849 
 850 /* It would be nice if this bit of code could be shared with the client.
 851  * Obstacles:
 852  *      The client shouldn't malloc(), would have to pass in own memory.
 853  *      The server uses base of head iovec as read pointer, while the
 854  *      client uses separate pointer. */
 855 static int
 856 unwrap_integ_data(struct svc_rqst *rqstp, struct xdr_buf *buf, u32 seq, struct gss_ctx *ctx)
 857 {
 858         int stat = -EINVAL;
 859         u32 integ_len, maj_stat;
 860         struct xdr_netobj mic;
 861         struct xdr_buf integ_buf;
 862 
 863         /* NFS READ normally uses splice to send data in-place. However
 864          * the data in cache can change after the reply's MIC is computed
 865          * but before the RPC reply is sent. To prevent the client from
 866          * rejecting the server-computed MIC in this somewhat rare case,
 867          * do not use splice with the GSS integrity service.
 868          */
 869         clear_bit(RQ_SPLICE_OK, &rqstp->rq_flags);
 870 
 871         /* Did we already verify the signature on the original pass through? */
 872         if (rqstp->rq_deferred)
 873                 return 0;
 874 
 875         integ_len = svc_getnl(&buf->head[0]);
 876         if (integ_len & 3)
 877                 return stat;
 878         if (integ_len > buf->len)
 879                 return stat;
 880         if (xdr_buf_subsegment(buf, &integ_buf, 0, integ_len)) {
 881                 WARN_ON_ONCE(1);
 882                 return stat;
 883         }
 884         /* copy out mic... */
 885         if (read_u32_from_xdr_buf(buf, integ_len, &mic.len))
 886                 return stat;
 887         if (mic.len > RPC_MAX_AUTH_SIZE)
 888                 return stat;
 889         mic.data = kmalloc(mic.len, GFP_KERNEL);
 890         if (!mic.data)
 891                 return stat;
 892         if (read_bytes_from_xdr_buf(buf, integ_len + 4, mic.data, mic.len))
 893                 goto out;
 894         maj_stat = gss_verify_mic(ctx, &integ_buf, &mic);
 895         if (maj_stat != GSS_S_COMPLETE)
 896                 goto out;
 897         if (svc_getnl(&buf->head[0]) != seq)
 898                 goto out;
 899         /* trim off the mic and padding at the end before returning */
 900         xdr_buf_trim(buf, round_up_to_quad(mic.len) + 4);
 901         stat = 0;
 902 out:
 903         kfree(mic.data);
 904         return stat;
 905 }
 906 
 907 static inline int
 908 total_buf_len(struct xdr_buf *buf)
 909 {
 910         return buf->head[0].iov_len + buf->page_len + buf->tail[0].iov_len;
 911 }
 912 
 913 static void
 914 fix_priv_head(struct xdr_buf *buf, int pad)
 915 {
 916         if (buf->page_len == 0) {
 917                 /* We need to adjust head and buf->len in tandem in this
 918                  * case to make svc_defer() work--it finds the original
 919                  * buffer start using buf->len - buf->head[0].iov_len. */
 920                 buf->head[0].iov_len -= pad;
 921         }
 922 }
 923 
 924 static int
 925 unwrap_priv_data(struct svc_rqst *rqstp, struct xdr_buf *buf, u32 seq, struct gss_ctx *ctx)
 926 {
 927         u32 priv_len, maj_stat;
 928         int pad, remaining_len, offset;
 929 
 930         clear_bit(RQ_SPLICE_OK, &rqstp->rq_flags);
 931 
 932         priv_len = svc_getnl(&buf->head[0]);
 933         if (rqstp->rq_deferred) {
 934                 /* Already decrypted last time through! The sequence number
 935                  * check at out_seq is unnecessary but harmless: */
 936                 goto out_seq;
 937         }
 938         /* buf->len is the number of bytes from the original start of the
 939          * request to the end, where head[0].iov_len is just the bytes
 940          * not yet read from the head, so these two values are different: */
 941         remaining_len = total_buf_len(buf);
 942         if (priv_len > remaining_len)
 943                 return -EINVAL;
 944         pad = remaining_len - priv_len;
 945         buf->len -= pad;
 946         fix_priv_head(buf, pad);
 947 
 948         maj_stat = gss_unwrap(ctx, 0, priv_len, buf);
 949         pad = priv_len - buf->len;
 950         buf->len -= pad;
 951         /* The upper layers assume the buffer is aligned on 4-byte boundaries.
 952          * In the krb5p case, at least, the data ends up offset, so we need to
 953          * move it around. */
 954         /* XXX: This is very inefficient.  It would be better to either do
 955          * this while we encrypt, or maybe in the receive code, if we can peak
 956          * ahead and work out the service and mechanism there. */
 957         offset = buf->head[0].iov_len % 4;
 958         if (offset) {
 959                 buf->buflen = RPCSVC_MAXPAYLOAD;
 960                 xdr_shift_buf(buf, offset);
 961                 fix_priv_head(buf, pad);
 962         }
 963         if (maj_stat != GSS_S_COMPLETE)
 964                 return -EINVAL;
 965 out_seq:
 966         if (svc_getnl(&buf->head[0]) != seq)
 967                 return -EINVAL;
 968         return 0;
 969 }
 970 
 971 struct gss_svc_data {
 972         /* decoded gss client cred: */
 973         struct rpc_gss_wire_cred        clcred;
 974         /* save a pointer to the beginning of the encoded verifier,
 975          * for use in encryption/checksumming in svcauth_gss_release: */
 976         __be32                          *verf_start;
 977         struct rsc                      *rsci;
 978 };
 979 
 980 static int
 981 svcauth_gss_set_client(struct svc_rqst *rqstp)
 982 {
 983         struct gss_svc_data *svcdata = rqstp->rq_auth_data;
 984         struct rsc *rsci = svcdata->rsci;
 985         struct rpc_gss_wire_cred *gc = &svcdata->clcred;
 986         int stat;
 987 
 988         /*
 989          * A gss export can be specified either by:
 990          *      export  *(sec=krb5,rw)
 991          * or by
 992          *      export gss/krb5(rw)
 993          * The latter is deprecated; but for backwards compatibility reasons
 994          * the nfsd code will still fall back on trying it if the former
 995          * doesn't work; so we try to make both available to nfsd, below.
 996          */
 997         rqstp->rq_gssclient = find_gss_auth_domain(rsci->mechctx, gc->gc_svc);
 998         if (rqstp->rq_gssclient == NULL)
 999                 return SVC_DENIED;
1000         stat = svcauth_unix_set_client(rqstp);
1001         if (stat == SVC_DROP || stat == SVC_CLOSE)
1002                 return stat;
1003         return SVC_OK;
1004 }
1005 
1006 static inline int
1007 gss_write_init_verf(struct cache_detail *cd, struct svc_rqst *rqstp,
1008                 struct xdr_netobj *out_handle, int *major_status)
1009 {
1010         struct rsc *rsci;
1011         int        rc;
1012 
1013         if (*major_status != GSS_S_COMPLETE)
1014                 return gss_write_null_verf(rqstp);
1015         rsci = gss_svc_searchbyctx(cd, out_handle);
1016         if (rsci == NULL) {
1017                 *major_status = GSS_S_NO_CONTEXT;
1018                 return gss_write_null_verf(rqstp);
1019         }
1020         rc = gss_write_verf(rqstp, rsci->mechctx, GSS_SEQ_WIN);
1021         cache_put(&rsci->h, cd);
1022         return rc;
1023 }
1024 
1025 static inline int
1026 gss_read_common_verf(struct rpc_gss_wire_cred *gc,
1027                      struct kvec *argv, __be32 *authp,
1028                      struct xdr_netobj *in_handle)
1029 {
1030         /* Read the verifier; should be NULL: */
1031         *authp = rpc_autherr_badverf;
1032         if (argv->iov_len < 2 * 4)
1033                 return SVC_DENIED;
1034         if (svc_getnl(argv) != RPC_AUTH_NULL)
1035                 return SVC_DENIED;
1036         if (svc_getnl(argv) != 0)
1037                 return SVC_DENIED;
1038         /* Martial context handle and token for upcall: */
1039         *authp = rpc_autherr_badcred;
1040         if (gc->gc_proc == RPC_GSS_PROC_INIT && gc->gc_ctx.len != 0)
1041                 return SVC_DENIED;
1042         if (dup_netobj(in_handle, &gc->gc_ctx))
1043                 return SVC_CLOSE;
1044         *authp = rpc_autherr_badverf;
1045 
1046         return 0;
1047 }
1048 
1049 static inline int
1050 gss_read_verf(struct rpc_gss_wire_cred *gc,
1051               struct kvec *argv, __be32 *authp,
1052               struct xdr_netobj *in_handle,
1053               struct xdr_netobj *in_token)
1054 {
1055         struct xdr_netobj tmpobj;
1056         int res;
1057 
1058         res = gss_read_common_verf(gc, argv, authp, in_handle);
1059         if (res)
1060                 return res;
1061 
1062         if (svc_safe_getnetobj(argv, &tmpobj)) {
1063                 kfree(in_handle->data);
1064                 return SVC_DENIED;
1065         }
1066         if (dup_netobj(in_token, &tmpobj)) {
1067                 kfree(in_handle->data);
1068                 return SVC_CLOSE;
1069         }
1070 
1071         return 0;
1072 }
1073 
1074 static void gss_free_in_token_pages(struct gssp_in_token *in_token)
1075 {
1076         u32 inlen;
1077         int i;
1078 
1079         i = 0;
1080         inlen = in_token->page_len;
1081         while (inlen) {
1082                 if (in_token->pages[i])
1083                         put_page(in_token->pages[i]);
1084                 inlen -= inlen > PAGE_SIZE ? PAGE_SIZE : inlen;
1085         }
1086 
1087         kfree(in_token->pages);
1088         in_token->pages = NULL;
1089 }
1090 
1091 static int gss_read_proxy_verf(struct svc_rqst *rqstp,
1092                                struct rpc_gss_wire_cred *gc, __be32 *authp,
1093                                struct xdr_netobj *in_handle,
1094                                struct gssp_in_token *in_token)
1095 {
1096         struct kvec *argv = &rqstp->rq_arg.head[0];
1097         unsigned int page_base, length;
1098         int pages, i, res;
1099         size_t inlen;
1100 
1101         res = gss_read_common_verf(gc, argv, authp, in_handle);
1102         if (res)
1103                 return res;
1104 
1105         inlen = svc_getnl(argv);
1106         if (inlen > (argv->iov_len + rqstp->rq_arg.page_len))
1107                 return SVC_DENIED;
1108 
1109         pages = DIV_ROUND_UP(inlen, PAGE_SIZE);
1110         in_token->pages = kcalloc(pages, sizeof(struct page *), GFP_KERNEL);
1111         if (!in_token->pages)
1112                 return SVC_DENIED;
1113         in_token->page_base = 0;
1114         in_token->page_len = inlen;
1115         for (i = 0; i < pages; i++) {
1116                 in_token->pages[i] = alloc_page(GFP_KERNEL);
1117                 if (!in_token->pages[i]) {
1118                         gss_free_in_token_pages(in_token);
1119                         return SVC_DENIED;
1120                 }
1121         }
1122 
1123         length = min_t(unsigned int, inlen, argv->iov_len);
1124         memcpy(page_address(in_token->pages[0]), argv->iov_base, length);
1125         inlen -= length;
1126 
1127         i = 1;
1128         page_base = rqstp->rq_arg.page_base;
1129         while (inlen) {
1130                 length = min_t(unsigned int, inlen, PAGE_SIZE);
1131                 memcpy(page_address(in_token->pages[i]),
1132                        page_address(rqstp->rq_arg.pages[i]) + page_base,
1133                        length);
1134 
1135                 inlen -= length;
1136                 page_base = 0;
1137                 i++;
1138         }
1139         return 0;
1140 }
1141 
1142 static inline int
1143 gss_write_resv(struct kvec *resv, size_t size_limit,
1144                struct xdr_netobj *out_handle, struct xdr_netobj *out_token,
1145                int major_status, int minor_status)
1146 {
1147         if (resv->iov_len + 4 > size_limit)
1148                 return -1;
1149         svc_putnl(resv, RPC_SUCCESS);
1150         if (svc_safe_putnetobj(resv, out_handle))
1151                 return -1;
1152         if (resv->iov_len + 3 * 4 > size_limit)
1153                 return -1;
1154         svc_putnl(resv, major_status);
1155         svc_putnl(resv, minor_status);
1156         svc_putnl(resv, GSS_SEQ_WIN);
1157         if (svc_safe_putnetobj(resv, out_token))
1158                 return -1;
1159         return 0;
1160 }
1161 
1162 /*
1163  * Having read the cred already and found we're in the context
1164  * initiation case, read the verifier and initiate (or check the results
1165  * of) upcalls to userspace for help with context initiation.  If
1166  * the upcall results are available, write the verifier and result.
1167  * Otherwise, drop the request pending an answer to the upcall.
1168  */
1169 static int svcauth_gss_legacy_init(struct svc_rqst *rqstp,
1170                         struct rpc_gss_wire_cred *gc, __be32 *authp)
1171 {
1172         struct kvec *argv = &rqstp->rq_arg.head[0];
1173         struct kvec *resv = &rqstp->rq_res.head[0];
1174         struct rsi *rsip, rsikey;
1175         int ret;
1176         struct sunrpc_net *sn = net_generic(SVC_NET(rqstp), sunrpc_net_id);
1177 
1178         memset(&rsikey, 0, sizeof(rsikey));
1179         ret = gss_read_verf(gc, argv, authp,
1180                             &rsikey.in_handle, &rsikey.in_token);
1181         if (ret)
1182                 return ret;
1183 
1184         /* Perform upcall, or find upcall result: */
1185         rsip = rsi_lookup(sn->rsi_cache, &rsikey);
1186         rsi_free(&rsikey);
1187         if (!rsip)
1188                 return SVC_CLOSE;
1189         if (cache_check(sn->rsi_cache, &rsip->h, &rqstp->rq_chandle) < 0)
1190                 /* No upcall result: */
1191                 return SVC_CLOSE;
1192 
1193         ret = SVC_CLOSE;
1194         /* Got an answer to the upcall; use it: */
1195         if (gss_write_init_verf(sn->rsc_cache, rqstp,
1196                                 &rsip->out_handle, &rsip->major_status))
1197                 goto out;
1198         if (gss_write_resv(resv, PAGE_SIZE,
1199                            &rsip->out_handle, &rsip->out_token,
1200                            rsip->major_status, rsip->minor_status))
1201                 goto out;
1202 
1203         ret = SVC_COMPLETE;
1204 out:
1205         cache_put(&rsip->h, sn->rsi_cache);
1206         return ret;
1207 }
1208 
1209 static int gss_proxy_save_rsc(struct cache_detail *cd,
1210                                 struct gssp_upcall_data *ud,
1211                                 uint64_t *handle)
1212 {
1213         struct rsc rsci, *rscp = NULL;
1214         static atomic64_t ctxhctr;
1215         long long ctxh;
1216         struct gss_api_mech *gm = NULL;
1217         time_t expiry;
1218         int status = -EINVAL;
1219 
1220         memset(&rsci, 0, sizeof(rsci));
1221         /* context handle */
1222         status = -ENOMEM;
1223         /* the handle needs to be just a unique id,
1224          * use a static counter */
1225         ctxh = atomic64_inc_return(&ctxhctr);
1226 
1227         /* make a copy for the caller */
1228         *handle = ctxh;
1229 
1230         /* make a copy for the rsc cache */
1231         if (dup_to_netobj(&rsci.handle, (char *)handle, sizeof(uint64_t)))
1232                 goto out;
1233         rscp = rsc_lookup(cd, &rsci);
1234         if (!rscp)
1235                 goto out;
1236 
1237         /* creds */
1238         if (!ud->found_creds) {
1239                 /* userspace seem buggy, we should always get at least a
1240                  * mapping to nobody */
1241                 dprintk("RPC:       No creds found!\n");
1242                 goto out;
1243         } else {
1244                 struct timespec64 boot;
1245 
1246                 /* steal creds */
1247                 rsci.cred = ud->creds;
1248                 memset(&ud->creds, 0, sizeof(struct svc_cred));
1249 
1250                 status = -EOPNOTSUPP;
1251                 /* get mech handle from OID */
1252                 gm = gss_mech_get_by_OID(&ud->mech_oid);
1253                 if (!gm)
1254                         goto out;
1255                 rsci.cred.cr_gss_mech = gm;
1256 
1257                 status = -EINVAL;
1258                 /* mech-specific data: */
1259                 status = gss_import_sec_context(ud->out_handle.data,
1260                                                 ud->out_handle.len,
1261                                                 gm, &rsci.mechctx,
1262                                                 &expiry, GFP_KERNEL);
1263                 if (status)
1264                         goto out;
1265 
1266                 getboottime64(&boot);
1267                 expiry -= boot.tv_sec;
1268         }
1269 
1270         rsci.h.expiry_time = expiry;
1271         rscp = rsc_update(cd, &rsci, rscp);
1272         status = 0;
1273 out:
1274         rsc_free(&rsci);
1275         if (rscp)
1276                 cache_put(&rscp->h, cd);
1277         else
1278                 status = -ENOMEM;
1279         return status;
1280 }
1281 
1282 static int svcauth_gss_proxy_init(struct svc_rqst *rqstp,
1283                         struct rpc_gss_wire_cred *gc, __be32 *authp)
1284 {
1285         struct kvec *resv = &rqstp->rq_res.head[0];
1286         struct xdr_netobj cli_handle;
1287         struct gssp_upcall_data ud;
1288         uint64_t handle;
1289         int status;
1290         int ret;
1291         struct net *net = SVC_NET(rqstp);
1292         struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1293 
1294         memset(&ud, 0, sizeof(ud));
1295         ret = gss_read_proxy_verf(rqstp, gc, authp,
1296                                   &ud.in_handle, &ud.in_token);
1297         if (ret)
1298                 return ret;
1299 
1300         ret = SVC_CLOSE;
1301 
1302         /* Perform synchronous upcall to gss-proxy */
1303         status = gssp_accept_sec_context_upcall(net, &ud);
1304         if (status)
1305                 goto out;
1306 
1307         dprintk("RPC:       svcauth_gss: gss major status = %d "
1308                         "minor status = %d\n",
1309                         ud.major_status, ud.minor_status);
1310 
1311         switch (ud.major_status) {
1312         case GSS_S_CONTINUE_NEEDED:
1313                 cli_handle = ud.out_handle;
1314                 break;
1315         case GSS_S_COMPLETE:
1316                 status = gss_proxy_save_rsc(sn->rsc_cache, &ud, &handle);
1317                 if (status) {
1318                         pr_info("%s: gss_proxy_save_rsc failed (%d)\n",
1319                                 __func__, status);
1320                         goto out;
1321                 }
1322                 cli_handle.data = (u8 *)&handle;
1323                 cli_handle.len = sizeof(handle);
1324                 break;
1325         default:
1326                 ret = SVC_CLOSE;
1327                 goto out;
1328         }
1329 
1330         /* Got an answer to the upcall; use it: */
1331         if (gss_write_init_verf(sn->rsc_cache, rqstp,
1332                                 &cli_handle, &ud.major_status)) {
1333                 pr_info("%s: gss_write_init_verf failed\n", __func__);
1334                 goto out;
1335         }
1336         if (gss_write_resv(resv, PAGE_SIZE,
1337                            &cli_handle, &ud.out_token,
1338                            ud.major_status, ud.minor_status)) {
1339                 pr_info("%s: gss_write_resv failed\n", __func__);
1340                 goto out;
1341         }
1342 
1343         ret = SVC_COMPLETE;
1344 out:
1345         gss_free_in_token_pages(&ud.in_token);
1346         gssp_free_upcall_data(&ud);
1347         return ret;
1348 }
1349 
1350 /*
1351  * Try to set the sn->use_gss_proxy variable to a new value. We only allow
1352  * it to be changed if it's currently undefined (-1). If it's any other value
1353  * then return -EBUSY unless the type wouldn't have changed anyway.
1354  */
1355 static int set_gss_proxy(struct net *net, int type)
1356 {
1357         struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1358         int ret;
1359 
1360         WARN_ON_ONCE(type != 0 && type != 1);
1361         ret = cmpxchg(&sn->use_gss_proxy, -1, type);
1362         if (ret != -1 && ret != type)
1363                 return -EBUSY;
1364         return 0;
1365 }
1366 
1367 static bool use_gss_proxy(struct net *net)
1368 {
1369         struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1370 
1371         /* If use_gss_proxy is still undefined, then try to disable it */
1372         if (sn->use_gss_proxy == -1)
1373                 set_gss_proxy(net, 0);
1374         return sn->use_gss_proxy;
1375 }
1376 
1377 #ifdef CONFIG_PROC_FS
1378 
1379 static ssize_t write_gssp(struct file *file, const char __user *buf,
1380                          size_t count, loff_t *ppos)
1381 {
1382         struct net *net = PDE_DATA(file_inode(file));
1383         char tbuf[20];
1384         unsigned long i;
1385         int res;
1386 
1387         if (*ppos || count > sizeof(tbuf)-1)
1388                 return -EINVAL;
1389         if (copy_from_user(tbuf, buf, count))
1390                 return -EFAULT;
1391 
1392         tbuf[count] = 0;
1393         res = kstrtoul(tbuf, 0, &i);
1394         if (res)
1395                 return res;
1396         if (i != 1)
1397                 return -EINVAL;
1398         res = set_gssp_clnt(net);
1399         if (res)
1400                 return res;
1401         res = set_gss_proxy(net, 1);
1402         if (res)
1403                 return res;
1404         return count;
1405 }
1406 
1407 static ssize_t read_gssp(struct file *file, char __user *buf,
1408                          size_t count, loff_t *ppos)
1409 {
1410         struct net *net = PDE_DATA(file_inode(file));
1411         struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1412         unsigned long p = *ppos;
1413         char tbuf[10];
1414         size_t len;
1415 
1416         snprintf(tbuf, sizeof(tbuf), "%d\n", sn->use_gss_proxy);
1417         len = strlen(tbuf);
1418         if (p >= len)
1419                 return 0;
1420         len -= p;
1421         if (len > count)
1422                 len = count;
1423         if (copy_to_user(buf, (void *)(tbuf+p), len))
1424                 return -EFAULT;
1425         *ppos += len;
1426         return len;
1427 }
1428 
1429 static const struct file_operations use_gss_proxy_ops = {
1430         .open = nonseekable_open,
1431         .write = write_gssp,
1432         .read = read_gssp,
1433 };
1434 
1435 static int create_use_gss_proxy_proc_entry(struct net *net)
1436 {
1437         struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1438         struct proc_dir_entry **p = &sn->use_gssp_proc;
1439 
1440         sn->use_gss_proxy = -1;
1441         *p = proc_create_data("use-gss-proxy", S_IFREG | 0600,
1442                               sn->proc_net_rpc,
1443                               &use_gss_proxy_ops, net);
1444         if (!*p)
1445                 return -ENOMEM;
1446         init_gssp_clnt(sn);
1447         return 0;
1448 }
1449 
1450 static void destroy_use_gss_proxy_proc_entry(struct net *net)
1451 {
1452         struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1453 
1454         if (sn->use_gssp_proc) {
1455                 remove_proc_entry("use-gss-proxy", sn->proc_net_rpc);
1456                 clear_gssp_clnt(sn);
1457         }
1458 }
1459 #else /* CONFIG_PROC_FS */
1460 
1461 static int create_use_gss_proxy_proc_entry(struct net *net)
1462 {
1463         return 0;
1464 }
1465 
1466 static void destroy_use_gss_proxy_proc_entry(struct net *net) {}
1467 
1468 #endif /* CONFIG_PROC_FS */
1469 
1470 /*
1471  * Accept an rpcsec packet.
1472  * If context establishment, punt to user space
1473  * If data exchange, verify/decrypt
1474  * If context destruction, handle here
1475  * In the context establishment and destruction case we encode
1476  * response here and return SVC_COMPLETE.
1477  */
1478 static int
1479 svcauth_gss_accept(struct svc_rqst *rqstp, __be32 *authp)
1480 {
1481         struct kvec     *argv = &rqstp->rq_arg.head[0];
1482         struct kvec     *resv = &rqstp->rq_res.head[0];
1483         u32             crlen;
1484         struct gss_svc_data *svcdata = rqstp->rq_auth_data;
1485         struct rpc_gss_wire_cred *gc;
1486         struct rsc      *rsci = NULL;
1487         __be32          *rpcstart;
1488         __be32          *reject_stat = resv->iov_base + resv->iov_len;
1489         int             ret;
1490         struct sunrpc_net *sn = net_generic(SVC_NET(rqstp), sunrpc_net_id);
1491 
1492         dprintk("RPC:       svcauth_gss: argv->iov_len = %zd\n",
1493                         argv->iov_len);
1494 
1495         *authp = rpc_autherr_badcred;
1496         if (!svcdata)
1497                 svcdata = kmalloc(sizeof(*svcdata), GFP_KERNEL);
1498         if (!svcdata)
1499                 goto auth_err;
1500         rqstp->rq_auth_data = svcdata;
1501         svcdata->verf_start = NULL;
1502         svcdata->rsci = NULL;
1503         gc = &svcdata->clcred;
1504 
1505         /* start of rpc packet is 7 u32's back from here:
1506          * xid direction rpcversion prog vers proc flavour
1507          */
1508         rpcstart = argv->iov_base;
1509         rpcstart -= 7;
1510 
1511         /* credential is:
1512          *   version(==1), proc(0,1,2,3), seq, service (1,2,3), handle
1513          * at least 5 u32s, and is preceded by length, so that makes 6.
1514          */
1515 
1516         if (argv->iov_len < 5 * 4)
1517                 goto auth_err;
1518         crlen = svc_getnl(argv);
1519         if (svc_getnl(argv) != RPC_GSS_VERSION)
1520                 goto auth_err;
1521         gc->gc_proc = svc_getnl(argv);
1522         gc->gc_seq = svc_getnl(argv);
1523         gc->gc_svc = svc_getnl(argv);
1524         if (svc_safe_getnetobj(argv, &gc->gc_ctx))
1525                 goto auth_err;
1526         if (crlen != round_up_to_quad(gc->gc_ctx.len) + 5 * 4)
1527                 goto auth_err;
1528 
1529         if ((gc->gc_proc != RPC_GSS_PROC_DATA) && (rqstp->rq_proc != 0))
1530                 goto auth_err;
1531 
1532         *authp = rpc_autherr_badverf;
1533         switch (gc->gc_proc) {
1534         case RPC_GSS_PROC_INIT:
1535         case RPC_GSS_PROC_CONTINUE_INIT:
1536                 if (use_gss_proxy(SVC_NET(rqstp)))
1537                         return svcauth_gss_proxy_init(rqstp, gc, authp);
1538                 else
1539                         return svcauth_gss_legacy_init(rqstp, gc, authp);
1540         case RPC_GSS_PROC_DATA:
1541         case RPC_GSS_PROC_DESTROY:
1542                 /* Look up the context, and check the verifier: */
1543                 *authp = rpcsec_gsserr_credproblem;
1544                 rsci = gss_svc_searchbyctx(sn->rsc_cache, &gc->gc_ctx);
1545                 if (!rsci)
1546                         goto auth_err;
1547                 switch (gss_verify_header(rqstp, rsci, rpcstart, gc, authp)) {
1548                 case SVC_OK:
1549                         break;
1550                 case SVC_DENIED:
1551                         goto auth_err;
1552                 case SVC_DROP:
1553                         goto drop;
1554                 }
1555                 break;
1556         default:
1557                 *authp = rpc_autherr_rejectedcred;
1558                 goto auth_err;
1559         }
1560 
1561         /* now act upon the command: */
1562         switch (gc->gc_proc) {
1563         case RPC_GSS_PROC_DESTROY:
1564                 if (gss_write_verf(rqstp, rsci->mechctx, gc->gc_seq))
1565                         goto auth_err;
1566                 /* Delete the entry from the cache_list and call cache_put */
1567                 sunrpc_cache_unhash(sn->rsc_cache, &rsci->h);
1568                 if (resv->iov_len + 4 > PAGE_SIZE)
1569                         goto drop;
1570                 svc_putnl(resv, RPC_SUCCESS);
1571                 goto complete;
1572         case RPC_GSS_PROC_DATA:
1573                 *authp = rpcsec_gsserr_ctxproblem;
1574                 svcdata->verf_start = resv->iov_base + resv->iov_len;
1575                 if (gss_write_verf(rqstp, rsci->mechctx, gc->gc_seq))
1576                         goto auth_err;
1577                 rqstp->rq_cred = rsci->cred;
1578                 get_group_info(rsci->cred.cr_group_info);
1579                 *authp = rpc_autherr_badcred;
1580                 switch (gc->gc_svc) {
1581                 case RPC_GSS_SVC_NONE:
1582                         break;
1583                 case RPC_GSS_SVC_INTEGRITY:
1584                         /* placeholders for length and seq. number: */
1585                         svc_putnl(resv, 0);
1586                         svc_putnl(resv, 0);
1587                         if (unwrap_integ_data(rqstp, &rqstp->rq_arg,
1588                                         gc->gc_seq, rsci->mechctx))
1589                                 goto garbage_args;
1590                         rqstp->rq_auth_slack = RPC_MAX_AUTH_SIZE;
1591                         break;
1592                 case RPC_GSS_SVC_PRIVACY:
1593                         /* placeholders for length and seq. number: */
1594                         svc_putnl(resv, 0);
1595                         svc_putnl(resv, 0);
1596                         if (unwrap_priv_data(rqstp, &rqstp->rq_arg,
1597                                         gc->gc_seq, rsci->mechctx))
1598                                 goto garbage_args;
1599                         rqstp->rq_auth_slack = RPC_MAX_AUTH_SIZE * 2;
1600                         break;
1601                 default:
1602                         goto auth_err;
1603                 }
1604                 svcdata->rsci = rsci;
1605                 cache_get(&rsci->h);
1606                 rqstp->rq_cred.cr_flavor = gss_svc_to_pseudoflavor(
1607                                         rsci->mechctx->mech_type,
1608                                         GSS_C_QOP_DEFAULT,
1609                                         gc->gc_svc);
1610                 ret = SVC_OK;
1611                 goto out;
1612         }
1613 garbage_args:
1614         ret = SVC_GARBAGE;
1615         goto out;
1616 auth_err:
1617         /* Restore write pointer to its original value: */
1618         xdr_ressize_check(rqstp, reject_stat);
1619         ret = SVC_DENIED;
1620         goto out;
1621 complete:
1622         ret = SVC_COMPLETE;
1623         goto out;
1624 drop:
1625         ret = SVC_CLOSE;
1626 out:
1627         if (rsci)
1628                 cache_put(&rsci->h, sn->rsc_cache);
1629         return ret;
1630 }
1631 
1632 static __be32 *
1633 svcauth_gss_prepare_to_wrap(struct xdr_buf *resbuf, struct gss_svc_data *gsd)
1634 {
1635         __be32 *p;
1636         u32 verf_len;
1637 
1638         p = gsd->verf_start;
1639         gsd->verf_start = NULL;
1640 
1641         /* If the reply stat is nonzero, don't wrap: */
1642         if (*(p-1) != rpc_success)
1643                 return NULL;
1644         /* Skip the verifier: */
1645         p += 1;
1646         verf_len = ntohl(*p++);
1647         p += XDR_QUADLEN(verf_len);
1648         /* move accept_stat to right place: */
1649         memcpy(p, p + 2, 4);
1650         /* Also don't wrap if the accept stat is nonzero: */
1651         if (*p != rpc_success) {
1652                 resbuf->head[0].iov_len -= 2 * 4;
1653                 return NULL;
1654         }
1655         p++;
1656         return p;
1657 }
1658 
1659 static inline int
1660 svcauth_gss_wrap_resp_integ(struct svc_rqst *rqstp)
1661 {
1662         struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data;
1663         struct rpc_gss_wire_cred *gc = &gsd->clcred;
1664         struct xdr_buf *resbuf = &rqstp->rq_res;
1665         struct xdr_buf integ_buf;
1666         struct xdr_netobj mic;
1667         struct kvec *resv;
1668         __be32 *p;
1669         int integ_offset, integ_len;
1670         int stat = -EINVAL;
1671 
1672         p = svcauth_gss_prepare_to_wrap(resbuf, gsd);
1673         if (p == NULL)
1674                 goto out;
1675         integ_offset = (u8 *)(p + 1) - (u8 *)resbuf->head[0].iov_base;
1676         integ_len = resbuf->len - integ_offset;
1677         BUG_ON(integ_len % 4);
1678         *p++ = htonl(integ_len);
1679         *p++ = htonl(gc->gc_seq);
1680         if (xdr_buf_subsegment(resbuf, &integ_buf, integ_offset, integ_len)) {
1681                 WARN_ON_ONCE(1);
1682                 goto out_err;
1683         }
1684         if (resbuf->tail[0].iov_base == NULL) {
1685                 if (resbuf->head[0].iov_len + RPC_MAX_AUTH_SIZE > PAGE_SIZE)
1686                         goto out_err;
1687                 resbuf->tail[0].iov_base = resbuf->head[0].iov_base
1688                                                 + resbuf->head[0].iov_len;
1689                 resbuf->tail[0].iov_len = 0;
1690         }
1691         resv = &resbuf->tail[0];
1692         mic.data = (u8 *)resv->iov_base + resv->iov_len + 4;
1693         if (gss_get_mic(gsd->rsci->mechctx, &integ_buf, &mic))
1694                 goto out_err;
1695         svc_putnl(resv, mic.len);
1696         memset(mic.data + mic.len, 0,
1697                         round_up_to_quad(mic.len) - mic.len);
1698         resv->iov_len += XDR_QUADLEN(mic.len) << 2;
1699         /* not strictly required: */
1700         resbuf->len += XDR_QUADLEN(mic.len) << 2;
1701         BUG_ON(resv->iov_len > PAGE_SIZE);
1702 out:
1703         stat = 0;
1704 out_err:
1705         return stat;
1706 }
1707 
1708 static inline int
1709 svcauth_gss_wrap_resp_priv(struct svc_rqst *rqstp)
1710 {
1711         struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data;
1712         struct rpc_gss_wire_cred *gc = &gsd->clcred;
1713         struct xdr_buf *resbuf = &rqstp->rq_res;
1714         struct page **inpages = NULL;
1715         __be32 *p, *len;
1716         int offset;
1717         int pad;
1718 
1719         p = svcauth_gss_prepare_to_wrap(resbuf, gsd);
1720         if (p == NULL)
1721                 return 0;
1722         len = p++;
1723         offset = (u8 *)p - (u8 *)resbuf->head[0].iov_base;
1724         *p++ = htonl(gc->gc_seq);
1725         inpages = resbuf->pages;
1726         /* XXX: Would be better to write some xdr helper functions for
1727          * nfs{2,3,4}xdr.c that place the data right, instead of copying: */
1728 
1729         /*
1730          * If there is currently tail data, make sure there is
1731          * room for the head, tail, and 2 * RPC_MAX_AUTH_SIZE in
1732          * the page, and move the current tail data such that
1733          * there is RPC_MAX_AUTH_SIZE slack space available in
1734          * both the head and tail.
1735          */
1736         if (resbuf->tail[0].iov_base) {
1737                 BUG_ON(resbuf->tail[0].iov_base >= resbuf->head[0].iov_base
1738                                                         + PAGE_SIZE);
1739                 BUG_ON(resbuf->tail[0].iov_base < resbuf->head[0].iov_base);
1740                 if (resbuf->tail[0].iov_len + resbuf->head[0].iov_len
1741                                 + 2 * RPC_MAX_AUTH_SIZE > PAGE_SIZE)
1742                         return -ENOMEM;
1743                 memmove(resbuf->tail[0].iov_base + RPC_MAX_AUTH_SIZE,
1744                         resbuf->tail[0].iov_base,
1745                         resbuf->tail[0].iov_len);
1746                 resbuf->tail[0].iov_base += RPC_MAX_AUTH_SIZE;
1747         }
1748         /*
1749          * If there is no current tail data, make sure there is
1750          * room for the head data, and 2 * RPC_MAX_AUTH_SIZE in the
1751          * allotted page, and set up tail information such that there
1752          * is RPC_MAX_AUTH_SIZE slack space available in both the
1753          * head and tail.
1754          */
1755         if (resbuf->tail[0].iov_base == NULL) {
1756                 if (resbuf->head[0].iov_len + 2*RPC_MAX_AUTH_SIZE > PAGE_SIZE)
1757                         return -ENOMEM;
1758                 resbuf->tail[0].iov_base = resbuf->head[0].iov_base
1759                         + resbuf->head[0].iov_len + RPC_MAX_AUTH_SIZE;
1760                 resbuf->tail[0].iov_len = 0;
1761         }
1762         if (gss_wrap(gsd->rsci->mechctx, offset, resbuf, inpages))
1763                 return -ENOMEM;
1764         *len = htonl(resbuf->len - offset);
1765         pad = 3 - ((resbuf->len - offset - 1)&3);
1766         p = (__be32 *)(resbuf->tail[0].iov_base + resbuf->tail[0].iov_len);
1767         memset(p, 0, pad);
1768         resbuf->tail[0].iov_len += pad;
1769         resbuf->len += pad;
1770         return 0;
1771 }
1772 
1773 static int
1774 svcauth_gss_release(struct svc_rqst *rqstp)
1775 {
1776         struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data;
1777         struct rpc_gss_wire_cred *gc = &gsd->clcred;
1778         struct xdr_buf *resbuf = &rqstp->rq_res;
1779         int stat = -EINVAL;
1780         struct sunrpc_net *sn = net_generic(SVC_NET(rqstp), sunrpc_net_id);
1781 
1782         if (gc->gc_proc != RPC_GSS_PROC_DATA)
1783                 goto out;
1784         /* Release can be called twice, but we only wrap once. */
1785         if (gsd->verf_start == NULL)
1786                 goto out;
1787         /* normally not set till svc_send, but we need it here: */
1788         /* XXX: what for?  Do we mess it up the moment we call svc_putu32
1789          * or whatever? */
1790         resbuf->len = total_buf_len(resbuf);
1791         switch (gc->gc_svc) {
1792         case RPC_GSS_SVC_NONE:
1793                 break;
1794         case RPC_GSS_SVC_INTEGRITY:
1795                 stat = svcauth_gss_wrap_resp_integ(rqstp);
1796                 if (stat)
1797                         goto out_err;
1798                 break;
1799         case RPC_GSS_SVC_PRIVACY:
1800                 stat = svcauth_gss_wrap_resp_priv(rqstp);
1801                 if (stat)
1802                         goto out_err;
1803                 break;
1804         /*
1805          * For any other gc_svc value, svcauth_gss_accept() already set
1806          * the auth_error appropriately; just fall through:
1807          */
1808         }
1809 
1810 out:
1811         stat = 0;
1812 out_err:
1813         if (rqstp->rq_client)
1814                 auth_domain_put(rqstp->rq_client);
1815         rqstp->rq_client = NULL;
1816         if (rqstp->rq_gssclient)
1817                 auth_domain_put(rqstp->rq_gssclient);
1818         rqstp->rq_gssclient = NULL;
1819         if (rqstp->rq_cred.cr_group_info)
1820                 put_group_info(rqstp->rq_cred.cr_group_info);
1821         rqstp->rq_cred.cr_group_info = NULL;
1822         if (gsd->rsci)
1823                 cache_put(&gsd->rsci->h, sn->rsc_cache);
1824         gsd->rsci = NULL;
1825 
1826         return stat;
1827 }
1828 
1829 static void
1830 svcauth_gss_domain_release_rcu(struct rcu_head *head)
1831 {
1832         struct auth_domain *dom = container_of(head, struct auth_domain, rcu_head);
1833         struct gss_domain *gd = container_of(dom, struct gss_domain, h);
1834 
1835         kfree(dom->name);
1836         kfree(gd);
1837 }
1838 
1839 static void
1840 svcauth_gss_domain_release(struct auth_domain *dom)
1841 {
1842         call_rcu(&dom->rcu_head, svcauth_gss_domain_release_rcu);
1843 }
1844 
1845 static struct auth_ops svcauthops_gss = {
1846         .name           = "rpcsec_gss",
1847         .owner          = THIS_MODULE,
1848         .flavour        = RPC_AUTH_GSS,
1849         .accept         = svcauth_gss_accept,
1850         .release        = svcauth_gss_release,
1851         .domain_release = svcauth_gss_domain_release,
1852         .set_client     = svcauth_gss_set_client,
1853 };
1854 
1855 static int rsi_cache_create_net(struct net *net)
1856 {
1857         struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1858         struct cache_detail *cd;
1859         int err;
1860 
1861         cd = cache_create_net(&rsi_cache_template, net);
1862         if (IS_ERR(cd))
1863                 return PTR_ERR(cd);
1864         err = cache_register_net(cd, net);
1865         if (err) {
1866                 cache_destroy_net(cd, net);
1867                 return err;
1868         }
1869         sn->rsi_cache = cd;
1870         return 0;
1871 }
1872 
1873 static void rsi_cache_destroy_net(struct net *net)
1874 {
1875         struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1876         struct cache_detail *cd = sn->rsi_cache;
1877 
1878         sn->rsi_cache = NULL;
1879         cache_purge(cd);
1880         cache_unregister_net(cd, net);
1881         cache_destroy_net(cd, net);
1882 }
1883 
1884 static int rsc_cache_create_net(struct net *net)
1885 {
1886         struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1887         struct cache_detail *cd;
1888         int err;
1889 
1890         cd = cache_create_net(&rsc_cache_template, net);
1891         if (IS_ERR(cd))
1892                 return PTR_ERR(cd);
1893         err = cache_register_net(cd, net);
1894         if (err) {
1895                 cache_destroy_net(cd, net);
1896                 return err;
1897         }
1898         sn->rsc_cache = cd;
1899         return 0;
1900 }
1901 
1902 static void rsc_cache_destroy_net(struct net *net)
1903 {
1904         struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1905         struct cache_detail *cd = sn->rsc_cache;
1906 
1907         sn->rsc_cache = NULL;
1908         cache_purge(cd);
1909         cache_unregister_net(cd, net);
1910         cache_destroy_net(cd, net);
1911 }
1912 
1913 int
1914 gss_svc_init_net(struct net *net)
1915 {
1916         int rv;
1917 
1918         rv = rsc_cache_create_net(net);
1919         if (rv)
1920                 return rv;
1921         rv = rsi_cache_create_net(net);
1922         if (rv)
1923                 goto out1;
1924         rv = create_use_gss_proxy_proc_entry(net);
1925         if (rv)
1926                 goto out2;
1927         return 0;
1928 out2:
1929         destroy_use_gss_proxy_proc_entry(net);
1930 out1:
1931         rsc_cache_destroy_net(net);
1932         return rv;
1933 }
1934 
1935 void
1936 gss_svc_shutdown_net(struct net *net)
1937 {
1938         destroy_use_gss_proxy_proc_entry(net);
1939         rsi_cache_destroy_net(net);
1940         rsc_cache_destroy_net(net);
1941 }
1942 
1943 int
1944 gss_svc_init(void)
1945 {
1946         return svc_auth_register(RPC_AUTH_GSS, &svcauthops_gss);
1947 }
1948 
1949 void
1950 gss_svc_shutdown(void)
1951 {
1952         svc_auth_unregister(RPC_AUTH_GSS);
1953 }

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