1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * GSS Proxy upcall module
4 *
5 * Copyright (C) 2012 Simo Sorce <simo@redhat.com>
6 */
7
8 #include <linux/sunrpc/svcauth.h>
9 #include "gss_rpc_xdr.h"
10
gssx_enc_bool(struct xdr_stream * xdr,int v)11 static int gssx_enc_bool(struct xdr_stream *xdr, int v)
12 {
13 __be32 *p;
14
15 p = xdr_reserve_space(xdr, 4);
16 if (unlikely(p == NULL))
17 return -ENOSPC;
18 *p = v ? xdr_one : xdr_zero;
19 return 0;
20 }
21
gssx_dec_bool(struct xdr_stream * xdr,u32 * v)22 static int gssx_dec_bool(struct xdr_stream *xdr, u32 *v)
23 {
24 __be32 *p;
25
26 p = xdr_inline_decode(xdr, 4);
27 if (unlikely(p == NULL))
28 return -ENOSPC;
29 *v = be32_to_cpu(*p);
30 return 0;
31 }
32
gssx_enc_buffer(struct xdr_stream * xdr,const gssx_buffer * buf)33 static int gssx_enc_buffer(struct xdr_stream *xdr,
34 const gssx_buffer *buf)
35 {
36 __be32 *p;
37
38 p = xdr_reserve_space(xdr, sizeof(u32) + buf->len);
39 if (!p)
40 return -ENOSPC;
41 xdr_encode_opaque(p, buf->data, buf->len);
42 return 0;
43 }
44
gssx_enc_in_token(struct xdr_stream * xdr,const struct gssp_in_token * in)45 static int gssx_enc_in_token(struct xdr_stream *xdr,
46 const struct gssp_in_token *in)
47 {
48 __be32 *p;
49
50 p = xdr_reserve_space(xdr, 4);
51 if (!p)
52 return -ENOSPC;
53 *p = cpu_to_be32(in->page_len);
54
55 /* all we need to do is to write pages */
56 xdr_write_pages(xdr, in->pages, in->page_base, in->page_len);
57
58 return 0;
59 }
60
61
gssx_dec_buffer(struct xdr_stream * xdr,gssx_buffer * buf)62 static int gssx_dec_buffer(struct xdr_stream *xdr,
63 gssx_buffer *buf)
64 {
65 u32 length;
66 __be32 *p;
67
68 p = xdr_inline_decode(xdr, 4);
69 if (unlikely(p == NULL))
70 return -ENOSPC;
71
72 length = be32_to_cpup(p);
73 p = xdr_inline_decode(xdr, length);
74 if (unlikely(p == NULL))
75 return -ENOSPC;
76
77 if (buf->len == 0) {
78 /* we intentionally are not interested in this buffer */
79 return 0;
80 }
81 if (length > buf->len)
82 return -ENOSPC;
83
84 if (!buf->data) {
85 buf->data = kmemdup(p, length, GFP_KERNEL);
86 if (!buf->data)
87 return -ENOMEM;
88 } else {
89 memcpy(buf->data, p, length);
90 }
91 buf->len = length;
92 return 0;
93 }
94
gssx_enc_option(struct xdr_stream * xdr,struct gssx_option * opt)95 static int gssx_enc_option(struct xdr_stream *xdr,
96 struct gssx_option *opt)
97 {
98 int err;
99
100 err = gssx_enc_buffer(xdr, &opt->option);
101 if (err)
102 return err;
103 err = gssx_enc_buffer(xdr, &opt->value);
104 return err;
105 }
106
gssx_dec_option(struct xdr_stream * xdr,struct gssx_option * opt)107 static int gssx_dec_option(struct xdr_stream *xdr,
108 struct gssx_option *opt)
109 {
110 int err;
111
112 err = gssx_dec_buffer(xdr, &opt->option);
113 if (err)
114 return err;
115 err = gssx_dec_buffer(xdr, &opt->value);
116 return err;
117 }
118
dummy_enc_opt_array(struct xdr_stream * xdr,const struct gssx_option_array * oa)119 static int dummy_enc_opt_array(struct xdr_stream *xdr,
120 const struct gssx_option_array *oa)
121 {
122 __be32 *p;
123
124 if (oa->count != 0)
125 return -EINVAL;
126
127 p = xdr_reserve_space(xdr, 4);
128 if (!p)
129 return -ENOSPC;
130 *p = 0;
131
132 return 0;
133 }
134
dummy_dec_opt_array(struct xdr_stream * xdr,struct gssx_option_array * oa)135 static int dummy_dec_opt_array(struct xdr_stream *xdr,
136 struct gssx_option_array *oa)
137 {
138 struct gssx_option dummy;
139 u32 count, i;
140 __be32 *p;
141
142 p = xdr_inline_decode(xdr, 4);
143 if (unlikely(p == NULL))
144 return -ENOSPC;
145 count = be32_to_cpup(p++);
146 memset(&dummy, 0, sizeof(dummy));
147 for (i = 0; i < count; i++) {
148 gssx_dec_option(xdr, &dummy);
149 }
150
151 oa->count = 0;
152 oa->data = NULL;
153 return 0;
154 }
155
get_host_u32(struct xdr_stream * xdr,u32 * res)156 static int get_host_u32(struct xdr_stream *xdr, u32 *res)
157 {
158 __be32 *p;
159
160 p = xdr_inline_decode(xdr, 4);
161 if (!p)
162 return -EINVAL;
163 /* Contents of linux creds are all host-endian: */
164 memcpy(res, p, sizeof(u32));
165 return 0;
166 }
167
gssx_dec_linux_creds(struct xdr_stream * xdr,struct svc_cred * creds)168 static int gssx_dec_linux_creds(struct xdr_stream *xdr,
169 struct svc_cred *creds)
170 {
171 u32 length;
172 __be32 *p;
173 u32 tmp;
174 u32 N;
175 int i, err;
176
177 p = xdr_inline_decode(xdr, 4);
178 if (unlikely(p == NULL))
179 return -ENOSPC;
180
181 length = be32_to_cpup(p);
182
183 if (length > (3 + NGROUPS_MAX) * sizeof(u32))
184 return -ENOSPC;
185
186 /* uid */
187 err = get_host_u32(xdr, &tmp);
188 if (err)
189 return err;
190 creds->cr_uid = make_kuid(&init_user_ns, tmp);
191
192 /* gid */
193 err = get_host_u32(xdr, &tmp);
194 if (err)
195 return err;
196 creds->cr_gid = make_kgid(&init_user_ns, tmp);
197
198 /* number of additional gid's */
199 err = get_host_u32(xdr, &tmp);
200 if (err)
201 return err;
202 N = tmp;
203 if ((3 + N) * sizeof(u32) != length)
204 return -EINVAL;
205 creds->cr_group_info = groups_alloc(N);
206 if (creds->cr_group_info == NULL)
207 return -ENOMEM;
208
209 /* gid's */
210 for (i = 0; i < N; i++) {
211 kgid_t kgid;
212 err = get_host_u32(xdr, &tmp);
213 if (err)
214 goto out_free_groups;
215 err = -EINVAL;
216 kgid = make_kgid(&init_user_ns, tmp);
217 if (!gid_valid(kgid))
218 goto out_free_groups;
219 creds->cr_group_info->gid[i] = kgid;
220 }
221 groups_sort(creds->cr_group_info);
222
223 return 0;
224 out_free_groups:
225 groups_free(creds->cr_group_info);
226 return err;
227 }
228
gssx_dec_option_array(struct xdr_stream * xdr,struct gssx_option_array * oa)229 static int gssx_dec_option_array(struct xdr_stream *xdr,
230 struct gssx_option_array *oa)
231 {
232 struct svc_cred *creds;
233 u32 count, i;
234 __be32 *p;
235 int err;
236
237 p = xdr_inline_decode(xdr, 4);
238 if (unlikely(p == NULL))
239 return -ENOSPC;
240 count = be32_to_cpup(p++);
241 if (!count)
242 return 0;
243
244 /* we recognize only 1 currently: CREDS_VALUE */
245 oa->count = 1;
246
247 oa->data = kmalloc(sizeof(struct gssx_option), GFP_KERNEL);
248 if (!oa->data)
249 return -ENOMEM;
250
251 creds = kzalloc(sizeof(struct svc_cred), GFP_KERNEL);
252 if (!creds) {
253 kfree(oa->data);
254 return -ENOMEM;
255 }
256
257 oa->data[0].option.data = CREDS_VALUE;
258 oa->data[0].option.len = sizeof(CREDS_VALUE);
259 oa->data[0].value.data = (void *)creds;
260 oa->data[0].value.len = 0;
261
262 for (i = 0; i < count; i++) {
263 gssx_buffer dummy = { 0, NULL };
264 u32 length;
265
266 /* option buffer */
267 p = xdr_inline_decode(xdr, 4);
268 if (unlikely(p == NULL))
269 return -ENOSPC;
270
271 length = be32_to_cpup(p);
272 p = xdr_inline_decode(xdr, length);
273 if (unlikely(p == NULL))
274 return -ENOSPC;
275
276 if (length == sizeof(CREDS_VALUE) &&
277 memcmp(p, CREDS_VALUE, sizeof(CREDS_VALUE)) == 0) {
278 /* We have creds here. parse them */
279 err = gssx_dec_linux_creds(xdr, creds);
280 if (err)
281 return err;
282 oa->data[0].value.len = 1; /* presence */
283 } else {
284 /* consume uninteresting buffer */
285 err = gssx_dec_buffer(xdr, &dummy);
286 if (err)
287 return err;
288 }
289 }
290 return 0;
291 }
292
gssx_dec_status(struct xdr_stream * xdr,struct gssx_status * status)293 static int gssx_dec_status(struct xdr_stream *xdr,
294 struct gssx_status *status)
295 {
296 __be32 *p;
297 int err;
298
299 /* status->major_status */
300 p = xdr_inline_decode(xdr, 8);
301 if (unlikely(p == NULL))
302 return -ENOSPC;
303 p = xdr_decode_hyper(p, &status->major_status);
304
305 /* status->mech */
306 err = gssx_dec_buffer(xdr, &status->mech);
307 if (err)
308 return err;
309
310 /* status->minor_status */
311 p = xdr_inline_decode(xdr, 8);
312 if (unlikely(p == NULL))
313 return -ENOSPC;
314 p = xdr_decode_hyper(p, &status->minor_status);
315
316 /* status->major_status_string */
317 err = gssx_dec_buffer(xdr, &status->major_status_string);
318 if (err)
319 return err;
320
321 /* status->minor_status_string */
322 err = gssx_dec_buffer(xdr, &status->minor_status_string);
323 if (err)
324 return err;
325
326 /* status->server_ctx */
327 err = gssx_dec_buffer(xdr, &status->server_ctx);
328 if (err)
329 return err;
330
331 /* we assume we have no options for now, so simply consume them */
332 /* status->options */
333 err = dummy_dec_opt_array(xdr, &status->options);
334
335 return err;
336 }
337
gssx_enc_call_ctx(struct xdr_stream * xdr,const struct gssx_call_ctx * ctx)338 static int gssx_enc_call_ctx(struct xdr_stream *xdr,
339 const struct gssx_call_ctx *ctx)
340 {
341 struct gssx_option opt;
342 __be32 *p;
343 int err;
344
345 /* ctx->locale */
346 err = gssx_enc_buffer(xdr, &ctx->locale);
347 if (err)
348 return err;
349
350 /* ctx->server_ctx */
351 err = gssx_enc_buffer(xdr, &ctx->server_ctx);
352 if (err)
353 return err;
354
355 /* we always want to ask for lucid contexts */
356 /* ctx->options */
357 p = xdr_reserve_space(xdr, 4);
358 *p = cpu_to_be32(2);
359
360 /* we want a lucid_v1 context */
361 opt.option.data = LUCID_OPTION;
362 opt.option.len = sizeof(LUCID_OPTION);
363 opt.value.data = LUCID_VALUE;
364 opt.value.len = sizeof(LUCID_VALUE);
365 err = gssx_enc_option(xdr, &opt);
366
367 /* ..and user creds */
368 opt.option.data = CREDS_OPTION;
369 opt.option.len = sizeof(CREDS_OPTION);
370 opt.value.data = CREDS_VALUE;
371 opt.value.len = sizeof(CREDS_VALUE);
372 err = gssx_enc_option(xdr, &opt);
373
374 return err;
375 }
376
gssx_dec_name_attr(struct xdr_stream * xdr,struct gssx_name_attr * attr)377 static int gssx_dec_name_attr(struct xdr_stream *xdr,
378 struct gssx_name_attr *attr)
379 {
380 int err;
381
382 /* attr->attr */
383 err = gssx_dec_buffer(xdr, &attr->attr);
384 if (err)
385 return err;
386
387 /* attr->value */
388 err = gssx_dec_buffer(xdr, &attr->value);
389 if (err)
390 return err;
391
392 /* attr->extensions */
393 err = dummy_dec_opt_array(xdr, &attr->extensions);
394
395 return err;
396 }
397
dummy_enc_nameattr_array(struct xdr_stream * xdr,struct gssx_name_attr_array * naa)398 static int dummy_enc_nameattr_array(struct xdr_stream *xdr,
399 struct gssx_name_attr_array *naa)
400 {
401 __be32 *p;
402
403 if (naa->count != 0)
404 return -EINVAL;
405
406 p = xdr_reserve_space(xdr, 4);
407 if (!p)
408 return -ENOSPC;
409 *p = 0;
410
411 return 0;
412 }
413
dummy_dec_nameattr_array(struct xdr_stream * xdr,struct gssx_name_attr_array * naa)414 static int dummy_dec_nameattr_array(struct xdr_stream *xdr,
415 struct gssx_name_attr_array *naa)
416 {
417 struct gssx_name_attr dummy = { .attr = {.len = 0} };
418 u32 count, i;
419 __be32 *p;
420
421 p = xdr_inline_decode(xdr, 4);
422 if (unlikely(p == NULL))
423 return -ENOSPC;
424 count = be32_to_cpup(p++);
425 for (i = 0; i < count; i++) {
426 gssx_dec_name_attr(xdr, &dummy);
427 }
428
429 naa->count = 0;
430 naa->data = NULL;
431 return 0;
432 }
433
434 static struct xdr_netobj zero_netobj = {};
435
436 static struct gssx_name_attr_array zero_name_attr_array = {};
437
438 static struct gssx_option_array zero_option_array = {};
439
gssx_enc_name(struct xdr_stream * xdr,struct gssx_name * name)440 static int gssx_enc_name(struct xdr_stream *xdr,
441 struct gssx_name *name)
442 {
443 int err;
444
445 /* name->display_name */
446 err = gssx_enc_buffer(xdr, &name->display_name);
447 if (err)
448 return err;
449
450 /* name->name_type */
451 err = gssx_enc_buffer(xdr, &zero_netobj);
452 if (err)
453 return err;
454
455 /* name->exported_name */
456 err = gssx_enc_buffer(xdr, &zero_netobj);
457 if (err)
458 return err;
459
460 /* name->exported_composite_name */
461 err = gssx_enc_buffer(xdr, &zero_netobj);
462 if (err)
463 return err;
464
465 /* leave name_attributes empty for now, will add once we have any
466 * to pass up at all */
467 /* name->name_attributes */
468 err = dummy_enc_nameattr_array(xdr, &zero_name_attr_array);
469 if (err)
470 return err;
471
472 /* leave options empty for now, will add once we have any options
473 * to pass up at all */
474 /* name->extensions */
475 err = dummy_enc_opt_array(xdr, &zero_option_array);
476
477 return err;
478 }
479
480
gssx_dec_name(struct xdr_stream * xdr,struct gssx_name * name)481 static int gssx_dec_name(struct xdr_stream *xdr,
482 struct gssx_name *name)
483 {
484 struct xdr_netobj dummy_netobj = { .len = 0 };
485 struct gssx_name_attr_array dummy_name_attr_array = { .count = 0 };
486 struct gssx_option_array dummy_option_array = { .count = 0 };
487 int err;
488
489 /* name->display_name */
490 err = gssx_dec_buffer(xdr, &name->display_name);
491 if (err)
492 return err;
493
494 /* name->name_type */
495 err = gssx_dec_buffer(xdr, &dummy_netobj);
496 if (err)
497 return err;
498
499 /* name->exported_name */
500 err = gssx_dec_buffer(xdr, &dummy_netobj);
501 if (err)
502 return err;
503
504 /* name->exported_composite_name */
505 err = gssx_dec_buffer(xdr, &dummy_netobj);
506 if (err)
507 return err;
508
509 /* we assume we have no attributes for now, so simply consume them */
510 /* name->name_attributes */
511 err = dummy_dec_nameattr_array(xdr, &dummy_name_attr_array);
512 if (err)
513 return err;
514
515 /* we assume we have no options for now, so simply consume them */
516 /* name->extensions */
517 err = dummy_dec_opt_array(xdr, &dummy_option_array);
518
519 return err;
520 }
521
dummy_enc_credel_array(struct xdr_stream * xdr,struct gssx_cred_element_array * cea)522 static int dummy_enc_credel_array(struct xdr_stream *xdr,
523 struct gssx_cred_element_array *cea)
524 {
525 __be32 *p;
526
527 if (cea->count != 0)
528 return -EINVAL;
529
530 p = xdr_reserve_space(xdr, 4);
531 if (!p)
532 return -ENOSPC;
533 *p = 0;
534
535 return 0;
536 }
537
gssx_enc_cred(struct xdr_stream * xdr,struct gssx_cred * cred)538 static int gssx_enc_cred(struct xdr_stream *xdr,
539 struct gssx_cred *cred)
540 {
541 int err;
542
543 /* cred->desired_name */
544 err = gssx_enc_name(xdr, &cred->desired_name);
545 if (err)
546 return err;
547
548 /* cred->elements */
549 err = dummy_enc_credel_array(xdr, &cred->elements);
550 if (err)
551 return err;
552
553 /* cred->cred_handle_reference */
554 err = gssx_enc_buffer(xdr, &cred->cred_handle_reference);
555 if (err)
556 return err;
557
558 /* cred->needs_release */
559 err = gssx_enc_bool(xdr, cred->needs_release);
560
561 return err;
562 }
563
gssx_enc_ctx(struct xdr_stream * xdr,struct gssx_ctx * ctx)564 static int gssx_enc_ctx(struct xdr_stream *xdr,
565 struct gssx_ctx *ctx)
566 {
567 __be32 *p;
568 int err;
569
570 /* ctx->exported_context_token */
571 err = gssx_enc_buffer(xdr, &ctx->exported_context_token);
572 if (err)
573 return err;
574
575 /* ctx->state */
576 err = gssx_enc_buffer(xdr, &ctx->state);
577 if (err)
578 return err;
579
580 /* ctx->need_release */
581 err = gssx_enc_bool(xdr, ctx->need_release);
582 if (err)
583 return err;
584
585 /* ctx->mech */
586 err = gssx_enc_buffer(xdr, &ctx->mech);
587 if (err)
588 return err;
589
590 /* ctx->src_name */
591 err = gssx_enc_name(xdr, &ctx->src_name);
592 if (err)
593 return err;
594
595 /* ctx->targ_name */
596 err = gssx_enc_name(xdr, &ctx->targ_name);
597 if (err)
598 return err;
599
600 /* ctx->lifetime */
601 p = xdr_reserve_space(xdr, 8+8);
602 if (!p)
603 return -ENOSPC;
604 p = xdr_encode_hyper(p, ctx->lifetime);
605
606 /* ctx->ctx_flags */
607 p = xdr_encode_hyper(p, ctx->ctx_flags);
608
609 /* ctx->locally_initiated */
610 err = gssx_enc_bool(xdr, ctx->locally_initiated);
611 if (err)
612 return err;
613
614 /* ctx->open */
615 err = gssx_enc_bool(xdr, ctx->open);
616 if (err)
617 return err;
618
619 /* leave options empty for now, will add once we have any options
620 * to pass up at all */
621 /* ctx->options */
622 err = dummy_enc_opt_array(xdr, &ctx->options);
623
624 return err;
625 }
626
gssx_dec_ctx(struct xdr_stream * xdr,struct gssx_ctx * ctx)627 static int gssx_dec_ctx(struct xdr_stream *xdr,
628 struct gssx_ctx *ctx)
629 {
630 __be32 *p;
631 int err;
632
633 /* ctx->exported_context_token */
634 err = gssx_dec_buffer(xdr, &ctx->exported_context_token);
635 if (err)
636 return err;
637
638 /* ctx->state */
639 err = gssx_dec_buffer(xdr, &ctx->state);
640 if (err)
641 return err;
642
643 /* ctx->need_release */
644 err = gssx_dec_bool(xdr, &ctx->need_release);
645 if (err)
646 return err;
647
648 /* ctx->mech */
649 err = gssx_dec_buffer(xdr, &ctx->mech);
650 if (err)
651 return err;
652
653 /* ctx->src_name */
654 err = gssx_dec_name(xdr, &ctx->src_name);
655 if (err)
656 return err;
657
658 /* ctx->targ_name */
659 err = gssx_dec_name(xdr, &ctx->targ_name);
660 if (err)
661 return err;
662
663 /* ctx->lifetime */
664 p = xdr_inline_decode(xdr, 8+8);
665 if (unlikely(p == NULL))
666 return -ENOSPC;
667 p = xdr_decode_hyper(p, &ctx->lifetime);
668
669 /* ctx->ctx_flags */
670 p = xdr_decode_hyper(p, &ctx->ctx_flags);
671
672 /* ctx->locally_initiated */
673 err = gssx_dec_bool(xdr, &ctx->locally_initiated);
674 if (err)
675 return err;
676
677 /* ctx->open */
678 err = gssx_dec_bool(xdr, &ctx->open);
679 if (err)
680 return err;
681
682 /* we assume we have no options for now, so simply consume them */
683 /* ctx->options */
684 err = dummy_dec_opt_array(xdr, &ctx->options);
685
686 return err;
687 }
688
gssx_enc_cb(struct xdr_stream * xdr,struct gssx_cb * cb)689 static int gssx_enc_cb(struct xdr_stream *xdr, struct gssx_cb *cb)
690 {
691 __be32 *p;
692 int err;
693
694 /* cb->initiator_addrtype */
695 p = xdr_reserve_space(xdr, 8);
696 if (!p)
697 return -ENOSPC;
698 p = xdr_encode_hyper(p, cb->initiator_addrtype);
699
700 /* cb->initiator_address */
701 err = gssx_enc_buffer(xdr, &cb->initiator_address);
702 if (err)
703 return err;
704
705 /* cb->acceptor_addrtype */
706 p = xdr_reserve_space(xdr, 8);
707 if (!p)
708 return -ENOSPC;
709 p = xdr_encode_hyper(p, cb->acceptor_addrtype);
710
711 /* cb->acceptor_address */
712 err = gssx_enc_buffer(xdr, &cb->acceptor_address);
713 if (err)
714 return err;
715
716 /* cb->application_data */
717 err = gssx_enc_buffer(xdr, &cb->application_data);
718
719 return err;
720 }
721
gssx_enc_accept_sec_context(struct rpc_rqst * req,struct xdr_stream * xdr,const void * data)722 void gssx_enc_accept_sec_context(struct rpc_rqst *req,
723 struct xdr_stream *xdr,
724 const void *data)
725 {
726 const struct gssx_arg_accept_sec_context *arg = data;
727 int err;
728
729 err = gssx_enc_call_ctx(xdr, &arg->call_ctx);
730 if (err)
731 goto done;
732
733 /* arg->context_handle */
734 if (arg->context_handle)
735 err = gssx_enc_ctx(xdr, arg->context_handle);
736 else
737 err = gssx_enc_bool(xdr, 0);
738 if (err)
739 goto done;
740
741 /* arg->cred_handle */
742 if (arg->cred_handle)
743 err = gssx_enc_cred(xdr, arg->cred_handle);
744 else
745 err = gssx_enc_bool(xdr, 0);
746 if (err)
747 goto done;
748
749 /* arg->input_token */
750 err = gssx_enc_in_token(xdr, &arg->input_token);
751 if (err)
752 goto done;
753
754 /* arg->input_cb */
755 if (arg->input_cb)
756 err = gssx_enc_cb(xdr, arg->input_cb);
757 else
758 err = gssx_enc_bool(xdr, 0);
759 if (err)
760 goto done;
761
762 err = gssx_enc_bool(xdr, arg->ret_deleg_cred);
763 if (err)
764 goto done;
765
766 /* leave options empty for now, will add once we have any options
767 * to pass up at all */
768 /* arg->options */
769 err = dummy_enc_opt_array(xdr, &arg->options);
770
771 xdr_inline_pages(&req->rq_rcv_buf,
772 PAGE_SIZE/2 /* pretty arbitrary */,
773 arg->pages, 0 /* page base */, arg->npages * PAGE_SIZE);
774 done:
775 if (err)
776 dprintk("RPC: gssx_enc_accept_sec_context: %d\n", err);
777 }
778
gssx_dec_accept_sec_context(struct rpc_rqst * rqstp,struct xdr_stream * xdr,void * data)779 int gssx_dec_accept_sec_context(struct rpc_rqst *rqstp,
780 struct xdr_stream *xdr,
781 void *data)
782 {
783 struct gssx_res_accept_sec_context *res = data;
784 u32 value_follows;
785 int err;
786 struct page *scratch;
787
788 scratch = alloc_page(GFP_KERNEL);
789 if (!scratch)
790 return -ENOMEM;
791 xdr_set_scratch_page(xdr, scratch);
792
793 /* res->status */
794 err = gssx_dec_status(xdr, &res->status);
795 if (err)
796 goto out_free;
797
798 /* res->context_handle */
799 err = gssx_dec_bool(xdr, &value_follows);
800 if (err)
801 goto out_free;
802 if (value_follows) {
803 err = gssx_dec_ctx(xdr, res->context_handle);
804 if (err)
805 goto out_free;
806 } else {
807 res->context_handle = NULL;
808 }
809
810 /* res->output_token */
811 err = gssx_dec_bool(xdr, &value_follows);
812 if (err)
813 goto out_free;
814 if (value_follows) {
815 err = gssx_dec_buffer(xdr, res->output_token);
816 if (err)
817 goto out_free;
818 } else {
819 res->output_token = NULL;
820 }
821
822 /* res->delegated_cred_handle */
823 err = gssx_dec_bool(xdr, &value_follows);
824 if (err)
825 goto out_free;
826 if (value_follows) {
827 /* we do not support upcall servers sending this data. */
828 err = -EINVAL;
829 goto out_free;
830 }
831
832 /* res->options */
833 err = gssx_dec_option_array(xdr, &res->options);
834
835 out_free:
836 __free_page(scratch);
837 return err;
838 }
839