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 
53 #include <trace/events/rpcgss.h>
54 
55 #include "gss_rpc_upcall.h"
56 
57 
58 /* The rpcsec_init cache is used for mapping RPCSEC_GSS_{,CONT_}INIT requests
59  * into replies.
60  *
61  * Key is context handle (\x if empty) and gss_token.
62  * Content is major_status minor_status (integers) context_handle, reply_token.
63  *
64  */
65 
66 static int netobj_equal(struct xdr_netobj *a, struct xdr_netobj *b)
67 {
68 	return a->len == b->len && 0 == memcmp(a->data, b->data, a->len);
69 }
70 
71 #define	RSI_HASHBITS	6
72 #define	RSI_HASHMAX	(1<<RSI_HASHBITS)
73 
74 struct rsi {
75 	struct cache_head	h;
76 	struct xdr_netobj	in_handle, in_token;
77 	struct xdr_netobj	out_handle, out_token;
78 	int			major_status, minor_status;
79 	struct rcu_head		rcu_head;
80 };
81 
82 static struct rsi *rsi_update(struct cache_detail *cd, struct rsi *new, struct rsi *old);
83 static struct rsi *rsi_lookup(struct cache_detail *cd, struct rsi *item);
84 
85 static void rsi_free(struct rsi *rsii)
86 {
87 	kfree(rsii->in_handle.data);
88 	kfree(rsii->in_token.data);
89 	kfree(rsii->out_handle.data);
90 	kfree(rsii->out_token.data);
91 }
92 
93 static void rsi_free_rcu(struct rcu_head *head)
94 {
95 	struct rsi *rsii = container_of(head, struct rsi, rcu_head);
96 
97 	rsi_free(rsii);
98 	kfree(rsii);
99 }
100 
101 static void rsi_put(struct kref *ref)
102 {
103 	struct rsi *rsii = container_of(ref, struct rsi, h.ref);
104 
105 	call_rcu(&rsii->rcu_head, rsi_free_rcu);
106 }
107 
108 static inline int rsi_hash(struct rsi *item)
109 {
110 	return hash_mem(item->in_handle.data, item->in_handle.len, RSI_HASHBITS)
111 	     ^ hash_mem(item->in_token.data, item->in_token.len, RSI_HASHBITS);
112 }
113 
114 static int rsi_match(struct cache_head *a, struct cache_head *b)
115 {
116 	struct rsi *item = container_of(a, struct rsi, h);
117 	struct rsi *tmp = container_of(b, struct rsi, h);
118 	return netobj_equal(&item->in_handle, &tmp->in_handle) &&
119 	       netobj_equal(&item->in_token, &tmp->in_token);
120 }
121 
122 static int dup_to_netobj(struct xdr_netobj *dst, char *src, int len)
123 {
124 	dst->len = len;
125 	dst->data = (len ? kmemdup(src, len, GFP_KERNEL) : NULL);
126 	if (len && !dst->data)
127 		return -ENOMEM;
128 	return 0;
129 }
130 
131 static inline int dup_netobj(struct xdr_netobj *dst, struct xdr_netobj *src)
132 {
133 	return dup_to_netobj(dst, src->data, src->len);
134 }
135 
136 static void rsi_init(struct cache_head *cnew, struct cache_head *citem)
137 {
138 	struct rsi *new = container_of(cnew, struct rsi, h);
139 	struct rsi *item = container_of(citem, struct rsi, h);
140 
141 	new->out_handle.data = NULL;
142 	new->out_handle.len = 0;
143 	new->out_token.data = NULL;
144 	new->out_token.len = 0;
145 	new->in_handle.len = item->in_handle.len;
146 	item->in_handle.len = 0;
147 	new->in_token.len = item->in_token.len;
148 	item->in_token.len = 0;
149 	new->in_handle.data = item->in_handle.data;
150 	item->in_handle.data = NULL;
151 	new->in_token.data = item->in_token.data;
152 	item->in_token.data = NULL;
153 }
154 
155 static void update_rsi(struct cache_head *cnew, struct cache_head *citem)
156 {
157 	struct rsi *new = container_of(cnew, struct rsi, h);
158 	struct rsi *item = container_of(citem, struct rsi, h);
159 
160 	BUG_ON(new->out_handle.data || new->out_token.data);
161 	new->out_handle.len = item->out_handle.len;
162 	item->out_handle.len = 0;
163 	new->out_token.len = item->out_token.len;
164 	item->out_token.len = 0;
165 	new->out_handle.data = item->out_handle.data;
166 	item->out_handle.data = NULL;
167 	new->out_token.data = item->out_token.data;
168 	item->out_token.data = NULL;
169 
170 	new->major_status = item->major_status;
171 	new->minor_status = item->minor_status;
172 }
173 
174 static struct cache_head *rsi_alloc(void)
175 {
176 	struct rsi *rsii = kmalloc(sizeof(*rsii), GFP_KERNEL);
177 	if (rsii)
178 		return &rsii->h;
179 	else
180 		return NULL;
181 }
182 
183 static int rsi_upcall(struct cache_detail *cd, struct cache_head *h)
184 {
185 	return sunrpc_cache_pipe_upcall_timeout(cd, h);
186 }
187 
188 static void rsi_request(struct cache_detail *cd,
189 		       struct cache_head *h,
190 		       char **bpp, int *blen)
191 {
192 	struct rsi *rsii = container_of(h, struct rsi, h);
193 
194 	qword_addhex(bpp, blen, rsii->in_handle.data, rsii->in_handle.len);
195 	qword_addhex(bpp, blen, rsii->in_token.data, rsii->in_token.len);
196 	(*bpp)[-1] = '\n';
197 }
198 
199 static int rsi_parse(struct cache_detail *cd,
200 		    char *mesg, int mlen)
201 {
202 	/* context token expiry major minor context token */
203 	char *buf = mesg;
204 	char *ep;
205 	int len;
206 	struct rsi rsii, *rsip = NULL;
207 	time64_t expiry;
208 	int status = -EINVAL;
209 
210 	memset(&rsii, 0, sizeof(rsii));
211 	/* handle */
212 	len = qword_get(&mesg, buf, mlen);
213 	if (len < 0)
214 		goto out;
215 	status = -ENOMEM;
216 	if (dup_to_netobj(&rsii.in_handle, buf, len))
217 		goto out;
218 
219 	/* token */
220 	len = qword_get(&mesg, buf, mlen);
221 	status = -EINVAL;
222 	if (len < 0)
223 		goto out;
224 	status = -ENOMEM;
225 	if (dup_to_netobj(&rsii.in_token, buf, len))
226 		goto out;
227 
228 	rsip = rsi_lookup(cd, &rsii);
229 	if (!rsip)
230 		goto out;
231 
232 	rsii.h.flags = 0;
233 	/* expiry */
234 	expiry = get_expiry(&mesg);
235 	status = -EINVAL;
236 	if (expiry == 0)
237 		goto out;
238 
239 	/* major/minor */
240 	len = qword_get(&mesg, buf, mlen);
241 	if (len <= 0)
242 		goto out;
243 	rsii.major_status = simple_strtoul(buf, &ep, 10);
244 	if (*ep)
245 		goto out;
246 	len = qword_get(&mesg, buf, mlen);
247 	if (len <= 0)
248 		goto out;
249 	rsii.minor_status = simple_strtoul(buf, &ep, 10);
250 	if (*ep)
251 		goto out;
252 
253 	/* out_handle */
254 	len = qword_get(&mesg, buf, mlen);
255 	if (len < 0)
256 		goto out;
257 	status = -ENOMEM;
258 	if (dup_to_netobj(&rsii.out_handle, buf, len))
259 		goto out;
260 
261 	/* out_token */
262 	len = qword_get(&mesg, buf, mlen);
263 	status = -EINVAL;
264 	if (len < 0)
265 		goto out;
266 	status = -ENOMEM;
267 	if (dup_to_netobj(&rsii.out_token, buf, len))
268 		goto out;
269 	rsii.h.expiry_time = expiry;
270 	rsip = rsi_update(cd, &rsii, rsip);
271 	status = 0;
272 out:
273 	rsi_free(&rsii);
274 	if (rsip)
275 		cache_put(&rsip->h, cd);
276 	else
277 		status = -ENOMEM;
278 	return status;
279 }
280 
281 static const struct cache_detail rsi_cache_template = {
282 	.owner		= THIS_MODULE,
283 	.hash_size	= RSI_HASHMAX,
284 	.name           = "auth.rpcsec.init",
285 	.cache_put      = rsi_put,
286 	.cache_upcall	= rsi_upcall,
287 	.cache_request  = rsi_request,
288 	.cache_parse    = rsi_parse,
289 	.match		= rsi_match,
290 	.init		= rsi_init,
291 	.update		= update_rsi,
292 	.alloc		= rsi_alloc,
293 };
294 
295 static struct rsi *rsi_lookup(struct cache_detail *cd, struct rsi *item)
296 {
297 	struct cache_head *ch;
298 	int hash = rsi_hash(item);
299 
300 	ch = sunrpc_cache_lookup_rcu(cd, &item->h, hash);
301 	if (ch)
302 		return container_of(ch, struct rsi, h);
303 	else
304 		return NULL;
305 }
306 
307 static struct rsi *rsi_update(struct cache_detail *cd, struct rsi *new, struct rsi *old)
308 {
309 	struct cache_head *ch;
310 	int hash = rsi_hash(new);
311 
312 	ch = sunrpc_cache_update(cd, &new->h,
313 				 &old->h, hash);
314 	if (ch)
315 		return container_of(ch, struct rsi, h);
316 	else
317 		return NULL;
318 }
319 
320 
321 /*
322  * The rpcsec_context cache is used to store a context that is
323  * used in data exchange.
324  * The key is a context handle. The content is:
325  *  uid, gidlist, mechanism, service-set, mech-specific-data
326  */
327 
328 #define	RSC_HASHBITS	10
329 #define	RSC_HASHMAX	(1<<RSC_HASHBITS)
330 
331 #define GSS_SEQ_WIN	128
332 
333 struct gss_svc_seq_data {
334 	/* highest seq number seen so far: */
335 	u32			sd_max;
336 	/* for i such that sd_max-GSS_SEQ_WIN < i <= sd_max, the i-th bit of
337 	 * sd_win is nonzero iff sequence number i has been seen already: */
338 	unsigned long		sd_win[GSS_SEQ_WIN/BITS_PER_LONG];
339 	spinlock_t		sd_lock;
340 };
341 
342 struct rsc {
343 	struct cache_head	h;
344 	struct xdr_netobj	handle;
345 	struct svc_cred		cred;
346 	struct gss_svc_seq_data	seqdata;
347 	struct gss_ctx		*mechctx;
348 	struct rcu_head		rcu_head;
349 };
350 
351 static struct rsc *rsc_update(struct cache_detail *cd, struct rsc *new, struct rsc *old);
352 static struct rsc *rsc_lookup(struct cache_detail *cd, struct rsc *item);
353 
354 static void rsc_free(struct rsc *rsci)
355 {
356 	kfree(rsci->handle.data);
357 	if (rsci->mechctx)
358 		gss_delete_sec_context(&rsci->mechctx);
359 	free_svc_cred(&rsci->cred);
360 }
361 
362 static void rsc_free_rcu(struct rcu_head *head)
363 {
364 	struct rsc *rsci = container_of(head, struct rsc, rcu_head);
365 
366 	kfree(rsci->handle.data);
367 	kfree(rsci);
368 }
369 
370 static void rsc_put(struct kref *ref)
371 {
372 	struct rsc *rsci = container_of(ref, struct rsc, h.ref);
373 
374 	if (rsci->mechctx)
375 		gss_delete_sec_context(&rsci->mechctx);
376 	free_svc_cred(&rsci->cred);
377 	call_rcu(&rsci->rcu_head, rsc_free_rcu);
378 }
379 
380 static inline int
381 rsc_hash(struct rsc *rsci)
382 {
383 	return hash_mem(rsci->handle.data, rsci->handle.len, RSC_HASHBITS);
384 }
385 
386 static int
387 rsc_match(struct cache_head *a, struct cache_head *b)
388 {
389 	struct rsc *new = container_of(a, struct rsc, h);
390 	struct rsc *tmp = container_of(b, struct rsc, h);
391 
392 	return netobj_equal(&new->handle, &tmp->handle);
393 }
394 
395 static void
396 rsc_init(struct cache_head *cnew, struct cache_head *ctmp)
397 {
398 	struct rsc *new = container_of(cnew, struct rsc, h);
399 	struct rsc *tmp = container_of(ctmp, struct rsc, h);
400 
401 	new->handle.len = tmp->handle.len;
402 	tmp->handle.len = 0;
403 	new->handle.data = tmp->handle.data;
404 	tmp->handle.data = NULL;
405 	new->mechctx = NULL;
406 	init_svc_cred(&new->cred);
407 }
408 
409 static void
410 update_rsc(struct cache_head *cnew, struct cache_head *ctmp)
411 {
412 	struct rsc *new = container_of(cnew, struct rsc, h);
413 	struct rsc *tmp = container_of(ctmp, struct rsc, h);
414 
415 	new->mechctx = tmp->mechctx;
416 	tmp->mechctx = NULL;
417 	memset(&new->seqdata, 0, sizeof(new->seqdata));
418 	spin_lock_init(&new->seqdata.sd_lock);
419 	new->cred = tmp->cred;
420 	init_svc_cred(&tmp->cred);
421 }
422 
423 static struct cache_head *
424 rsc_alloc(void)
425 {
426 	struct rsc *rsci = kmalloc(sizeof(*rsci), GFP_KERNEL);
427 	if (rsci)
428 		return &rsci->h;
429 	else
430 		return NULL;
431 }
432 
433 static int rsc_upcall(struct cache_detail *cd, struct cache_head *h)
434 {
435 	return -EINVAL;
436 }
437 
438 static int rsc_parse(struct cache_detail *cd,
439 		     char *mesg, int mlen)
440 {
441 	/* contexthandle expiry [ uid gid N <n gids> mechname ...mechdata... ] */
442 	char *buf = mesg;
443 	int id;
444 	int len, rv;
445 	struct rsc rsci, *rscp = NULL;
446 	time64_t expiry;
447 	int status = -EINVAL;
448 	struct gss_api_mech *gm = NULL;
449 
450 	memset(&rsci, 0, sizeof(rsci));
451 	/* context handle */
452 	len = qword_get(&mesg, buf, mlen);
453 	if (len < 0) goto out;
454 	status = -ENOMEM;
455 	if (dup_to_netobj(&rsci.handle, buf, len))
456 		goto out;
457 
458 	rsci.h.flags = 0;
459 	/* expiry */
460 	expiry = get_expiry(&mesg);
461 	status = -EINVAL;
462 	if (expiry == 0)
463 		goto out;
464 
465 	rscp = rsc_lookup(cd, &rsci);
466 	if (!rscp)
467 		goto out;
468 
469 	/* uid, or NEGATIVE */
470 	rv = get_int(&mesg, &id);
471 	if (rv == -EINVAL)
472 		goto out;
473 	if (rv == -ENOENT)
474 		set_bit(CACHE_NEGATIVE, &rsci.h.flags);
475 	else {
476 		int N, i;
477 
478 		/*
479 		 * NOTE: we skip uid_valid()/gid_valid() checks here:
480 		 * instead, * -1 id's are later mapped to the
481 		 * (export-specific) anonymous id by nfsd_setuser.
482 		 *
483 		 * (But supplementary gid's get no such special
484 		 * treatment so are checked for validity here.)
485 		 */
486 		/* uid */
487 		rsci.cred.cr_uid = make_kuid(current_user_ns(), id);
488 
489 		/* gid */
490 		if (get_int(&mesg, &id))
491 			goto out;
492 		rsci.cred.cr_gid = make_kgid(current_user_ns(), id);
493 
494 		/* number of additional gid's */
495 		if (get_int(&mesg, &N))
496 			goto out;
497 		if (N < 0 || N > NGROUPS_MAX)
498 			goto out;
499 		status = -ENOMEM;
500 		rsci.cred.cr_group_info = groups_alloc(N);
501 		if (rsci.cred.cr_group_info == NULL)
502 			goto out;
503 
504 		/* gid's */
505 		status = -EINVAL;
506 		for (i=0; i<N; i++) {
507 			kgid_t kgid;
508 			if (get_int(&mesg, &id))
509 				goto out;
510 			kgid = make_kgid(current_user_ns(), id);
511 			if (!gid_valid(kgid))
512 				goto out;
513 			rsci.cred.cr_group_info->gid[i] = kgid;
514 		}
515 		groups_sort(rsci.cred.cr_group_info);
516 
517 		/* mech name */
518 		len = qword_get(&mesg, buf, mlen);
519 		if (len < 0)
520 			goto out;
521 		gm = rsci.cred.cr_gss_mech = gss_mech_get_by_name(buf);
522 		status = -EOPNOTSUPP;
523 		if (!gm)
524 			goto out;
525 
526 		status = -EINVAL;
527 		/* mech-specific data: */
528 		len = qword_get(&mesg, buf, mlen);
529 		if (len < 0)
530 			goto out;
531 		status = gss_import_sec_context(buf, len, gm, &rsci.mechctx,
532 						NULL, GFP_KERNEL);
533 		if (status)
534 			goto out;
535 
536 		/* get client name */
537 		len = qword_get(&mesg, buf, mlen);
538 		if (len > 0) {
539 			rsci.cred.cr_principal = kstrdup(buf, GFP_KERNEL);
540 			if (!rsci.cred.cr_principal) {
541 				status = -ENOMEM;
542 				goto out;
543 			}
544 		}
545 
546 	}
547 	rsci.h.expiry_time = expiry;
548 	rscp = rsc_update(cd, &rsci, rscp);
549 	status = 0;
550 out:
551 	rsc_free(&rsci);
552 	if (rscp)
553 		cache_put(&rscp->h, cd);
554 	else
555 		status = -ENOMEM;
556 	return status;
557 }
558 
559 static const struct cache_detail rsc_cache_template = {
560 	.owner		= THIS_MODULE,
561 	.hash_size	= RSC_HASHMAX,
562 	.name		= "auth.rpcsec.context",
563 	.cache_put	= rsc_put,
564 	.cache_upcall	= rsc_upcall,
565 	.cache_parse	= rsc_parse,
566 	.match		= rsc_match,
567 	.init		= rsc_init,
568 	.update		= update_rsc,
569 	.alloc		= rsc_alloc,
570 };
571 
572 static struct rsc *rsc_lookup(struct cache_detail *cd, struct rsc *item)
573 {
574 	struct cache_head *ch;
575 	int hash = rsc_hash(item);
576 
577 	ch = sunrpc_cache_lookup_rcu(cd, &item->h, hash);
578 	if (ch)
579 		return container_of(ch, struct rsc, h);
580 	else
581 		return NULL;
582 }
583 
584 static struct rsc *rsc_update(struct cache_detail *cd, struct rsc *new, struct rsc *old)
585 {
586 	struct cache_head *ch;
587 	int hash = rsc_hash(new);
588 
589 	ch = sunrpc_cache_update(cd, &new->h,
590 				 &old->h, hash);
591 	if (ch)
592 		return container_of(ch, struct rsc, h);
593 	else
594 		return NULL;
595 }
596 
597 
598 static struct rsc *
599 gss_svc_searchbyctx(struct cache_detail *cd, struct xdr_netobj *handle)
600 {
601 	struct rsc rsci;
602 	struct rsc *found;
603 
604 	memset(&rsci, 0, sizeof(rsci));
605 	if (dup_to_netobj(&rsci.handle, handle->data, handle->len))
606 		return NULL;
607 	found = rsc_lookup(cd, &rsci);
608 	rsc_free(&rsci);
609 	if (!found)
610 		return NULL;
611 	if (cache_check(cd, &found->h, NULL))
612 		return NULL;
613 	return found;
614 }
615 
616 /**
617  * gss_check_seq_num - GSS sequence number window check
618  * @rqstp: RPC Call to use when reporting errors
619  * @rsci: cached GSS context state (updated on return)
620  * @seq_num: sequence number to check
621  *
622  * Implements sequence number algorithm as specified in
623  * RFC 2203, Section 5.3.3.1. "Context Management".
624  *
625  * Return values:
626  *   %true: @rqstp's GSS sequence number is inside the window
627  *   %false: @rqstp's GSS sequence number is outside the window
628  */
629 static bool gss_check_seq_num(const struct svc_rqst *rqstp, struct rsc *rsci,
630 			      u32 seq_num)
631 {
632 	struct gss_svc_seq_data *sd = &rsci->seqdata;
633 	bool result = false;
634 
635 	spin_lock(&sd->sd_lock);
636 	if (seq_num > sd->sd_max) {
637 		if (seq_num >= sd->sd_max + GSS_SEQ_WIN) {
638 			memset(sd->sd_win, 0, sizeof(sd->sd_win));
639 			sd->sd_max = seq_num;
640 		} else while (sd->sd_max < seq_num) {
641 			sd->sd_max++;
642 			__clear_bit(sd->sd_max % GSS_SEQ_WIN, sd->sd_win);
643 		}
644 		__set_bit(seq_num % GSS_SEQ_WIN, sd->sd_win);
645 		goto ok;
646 	} else if (seq_num <= sd->sd_max - GSS_SEQ_WIN) {
647 		goto toolow;
648 	}
649 	if (__test_and_set_bit(seq_num % GSS_SEQ_WIN, sd->sd_win))
650 		goto alreadyseen;
651 
652 ok:
653 	result = true;
654 out:
655 	spin_unlock(&sd->sd_lock);
656 	return result;
657 
658 toolow:
659 	trace_rpcgss_svc_seqno_low(rqstp, seq_num,
660 				   sd->sd_max - GSS_SEQ_WIN,
661 				   sd->sd_max);
662 	goto out;
663 alreadyseen:
664 	trace_rpcgss_svc_seqno_seen(rqstp, seq_num);
665 	goto out;
666 }
667 
668 static inline u32 round_up_to_quad(u32 i)
669 {
670 	return (i + 3 ) & ~3;
671 }
672 
673 static inline int
674 svc_safe_getnetobj(struct kvec *argv, struct xdr_netobj *o)
675 {
676 	int l;
677 
678 	if (argv->iov_len < 4)
679 		return -1;
680 	o->len = svc_getnl(argv);
681 	l = round_up_to_quad(o->len);
682 	if (argv->iov_len < l)
683 		return -1;
684 	o->data = argv->iov_base;
685 	argv->iov_base += l;
686 	argv->iov_len -= l;
687 	return 0;
688 }
689 
690 static inline int
691 svc_safe_putnetobj(struct kvec *resv, struct xdr_netobj *o)
692 {
693 	u8 *p;
694 
695 	if (resv->iov_len + 4 > PAGE_SIZE)
696 		return -1;
697 	svc_putnl(resv, o->len);
698 	p = resv->iov_base + resv->iov_len;
699 	resv->iov_len += round_up_to_quad(o->len);
700 	if (resv->iov_len > PAGE_SIZE)
701 		return -1;
702 	memcpy(p, o->data, o->len);
703 	memset(p + o->len, 0, round_up_to_quad(o->len) - o->len);
704 	return 0;
705 }
706 
707 /*
708  * Verify the checksum on the header and return SVC_OK on success.
709  * Otherwise, return SVC_DROP (in the case of a bad sequence number)
710  * or return SVC_DENIED and indicate error in authp.
711  */
712 static int
713 gss_verify_header(struct svc_rqst *rqstp, struct rsc *rsci,
714 		  __be32 *rpcstart, struct rpc_gss_wire_cred *gc, __be32 *authp)
715 {
716 	struct gss_ctx		*ctx_id = rsci->mechctx;
717 	struct xdr_buf		rpchdr;
718 	struct xdr_netobj	checksum;
719 	u32			flavor = 0;
720 	struct kvec		*argv = &rqstp->rq_arg.head[0];
721 	struct kvec		iov;
722 
723 	/* data to compute the checksum over: */
724 	iov.iov_base = rpcstart;
725 	iov.iov_len = (u8 *)argv->iov_base - (u8 *)rpcstart;
726 	xdr_buf_from_iov(&iov, &rpchdr);
727 
728 	*authp = rpc_autherr_badverf;
729 	if (argv->iov_len < 4)
730 		return SVC_DENIED;
731 	flavor = svc_getnl(argv);
732 	if (flavor != RPC_AUTH_GSS)
733 		return SVC_DENIED;
734 	if (svc_safe_getnetobj(argv, &checksum))
735 		return SVC_DENIED;
736 
737 	if (rqstp->rq_deferred) /* skip verification of revisited request */
738 		return SVC_OK;
739 	if (gss_verify_mic(ctx_id, &rpchdr, &checksum) != GSS_S_COMPLETE) {
740 		*authp = rpcsec_gsserr_credproblem;
741 		return SVC_DENIED;
742 	}
743 
744 	if (gc->gc_seq > MAXSEQ) {
745 		trace_rpcgss_svc_seqno_large(rqstp, gc->gc_seq);
746 		*authp = rpcsec_gsserr_ctxproblem;
747 		return SVC_DENIED;
748 	}
749 	if (!gss_check_seq_num(rqstp, rsci, gc->gc_seq))
750 		return SVC_DROP;
751 	return SVC_OK;
752 }
753 
754 static int
755 gss_write_null_verf(struct svc_rqst *rqstp)
756 {
757 	__be32     *p;
758 
759 	svc_putnl(rqstp->rq_res.head, RPC_AUTH_NULL);
760 	p = rqstp->rq_res.head->iov_base + rqstp->rq_res.head->iov_len;
761 	/* don't really need to check if head->iov_len > PAGE_SIZE ... */
762 	*p++ = 0;
763 	if (!xdr_ressize_check(rqstp, p))
764 		return -1;
765 	return 0;
766 }
767 
768 static int
769 gss_write_verf(struct svc_rqst *rqstp, struct gss_ctx *ctx_id, u32 seq)
770 {
771 	__be32			*xdr_seq;
772 	u32			maj_stat;
773 	struct xdr_buf		verf_data;
774 	struct xdr_netobj	mic;
775 	__be32			*p;
776 	struct kvec		iov;
777 	int err = -1;
778 
779 	svc_putnl(rqstp->rq_res.head, RPC_AUTH_GSS);
780 	xdr_seq = kmalloc(4, GFP_KERNEL);
781 	if (!xdr_seq)
782 		return -1;
783 	*xdr_seq = htonl(seq);
784 
785 	iov.iov_base = xdr_seq;
786 	iov.iov_len = 4;
787 	xdr_buf_from_iov(&iov, &verf_data);
788 	p = rqstp->rq_res.head->iov_base + rqstp->rq_res.head->iov_len;
789 	mic.data = (u8 *)(p + 1);
790 	maj_stat = gss_get_mic(ctx_id, &verf_data, &mic);
791 	if (maj_stat != GSS_S_COMPLETE)
792 		goto out;
793 	*p++ = htonl(mic.len);
794 	memset((u8 *)p + mic.len, 0, round_up_to_quad(mic.len) - mic.len);
795 	p += XDR_QUADLEN(mic.len);
796 	if (!xdr_ressize_check(rqstp, p))
797 		goto out;
798 	err = 0;
799 out:
800 	kfree(xdr_seq);
801 	return err;
802 }
803 
804 struct gss_domain {
805 	struct auth_domain	h;
806 	u32			pseudoflavor;
807 };
808 
809 static struct auth_domain *
810 find_gss_auth_domain(struct gss_ctx *ctx, u32 svc)
811 {
812 	char *name;
813 
814 	name = gss_service_to_auth_domain_name(ctx->mech_type, svc);
815 	if (!name)
816 		return NULL;
817 	return auth_domain_find(name);
818 }
819 
820 static struct auth_ops svcauthops_gss;
821 
822 u32 svcauth_gss_flavor(struct auth_domain *dom)
823 {
824 	struct gss_domain *gd = container_of(dom, struct gss_domain, h);
825 
826 	return gd->pseudoflavor;
827 }
828 
829 EXPORT_SYMBOL_GPL(svcauth_gss_flavor);
830 
831 struct auth_domain *
832 svcauth_gss_register_pseudoflavor(u32 pseudoflavor, char * name)
833 {
834 	struct gss_domain	*new;
835 	struct auth_domain	*test;
836 	int			stat = -ENOMEM;
837 
838 	new = kmalloc(sizeof(*new), GFP_KERNEL);
839 	if (!new)
840 		goto out;
841 	kref_init(&new->h.ref);
842 	new->h.name = kstrdup(name, GFP_KERNEL);
843 	if (!new->h.name)
844 		goto out_free_dom;
845 	new->h.flavour = &svcauthops_gss;
846 	new->pseudoflavor = pseudoflavor;
847 
848 	test = auth_domain_lookup(name, &new->h);
849 	if (test != &new->h) {
850 		pr_warn("svc: duplicate registration of gss pseudo flavour %s.\n",
851 			name);
852 		stat = -EADDRINUSE;
853 		auth_domain_put(test);
854 		goto out_free_name;
855 	}
856 	return test;
857 
858 out_free_name:
859 	kfree(new->h.name);
860 out_free_dom:
861 	kfree(new);
862 out:
863 	return ERR_PTR(stat);
864 }
865 EXPORT_SYMBOL_GPL(svcauth_gss_register_pseudoflavor);
866 
867 static inline int
868 read_u32_from_xdr_buf(struct xdr_buf *buf, int base, u32 *obj)
869 {
870 	__be32  raw;
871 	int     status;
872 
873 	status = read_bytes_from_xdr_buf(buf, base, &raw, sizeof(*obj));
874 	if (status)
875 		return status;
876 	*obj = ntohl(raw);
877 	return 0;
878 }
879 
880 /* It would be nice if this bit of code could be shared with the client.
881  * Obstacles:
882  *	The client shouldn't malloc(), would have to pass in own memory.
883  *	The server uses base of head iovec as read pointer, while the
884  *	client uses separate pointer. */
885 static int
886 unwrap_integ_data(struct svc_rqst *rqstp, struct xdr_buf *buf, u32 seq, struct gss_ctx *ctx)
887 {
888 	u32 integ_len, rseqno, maj_stat;
889 	int stat = -EINVAL;
890 	struct xdr_netobj mic;
891 	struct xdr_buf integ_buf;
892 
893 	mic.data = NULL;
894 
895 	/* NFS READ normally uses splice to send data in-place. However
896 	 * the data in cache can change after the reply's MIC is computed
897 	 * but before the RPC reply is sent. To prevent the client from
898 	 * rejecting the server-computed MIC in this somewhat rare case,
899 	 * do not use splice with the GSS integrity service.
900 	 */
901 	clear_bit(RQ_SPLICE_OK, &rqstp->rq_flags);
902 
903 	/* Did we already verify the signature on the original pass through? */
904 	if (rqstp->rq_deferred)
905 		return 0;
906 
907 	integ_len = svc_getnl(&buf->head[0]);
908 	if (integ_len & 3)
909 		goto unwrap_failed;
910 	if (integ_len > buf->len)
911 		goto unwrap_failed;
912 	if (xdr_buf_subsegment(buf, &integ_buf, 0, integ_len))
913 		goto unwrap_failed;
914 
915 	/* copy out mic... */
916 	if (read_u32_from_xdr_buf(buf, integ_len, &mic.len))
917 		goto unwrap_failed;
918 	if (mic.len > RPC_MAX_AUTH_SIZE)
919 		goto unwrap_failed;
920 	mic.data = kmalloc(mic.len, GFP_KERNEL);
921 	if (!mic.data)
922 		goto unwrap_failed;
923 	if (read_bytes_from_xdr_buf(buf, integ_len + 4, mic.data, mic.len))
924 		goto unwrap_failed;
925 	maj_stat = gss_verify_mic(ctx, &integ_buf, &mic);
926 	if (maj_stat != GSS_S_COMPLETE)
927 		goto bad_mic;
928 	rseqno = svc_getnl(&buf->head[0]);
929 	if (rseqno != seq)
930 		goto bad_seqno;
931 	/* trim off the mic and padding at the end before returning */
932 	xdr_buf_trim(buf, round_up_to_quad(mic.len) + 4);
933 	stat = 0;
934 out:
935 	kfree(mic.data);
936 	return stat;
937 
938 unwrap_failed:
939 	trace_rpcgss_svc_unwrap_failed(rqstp);
940 	goto out;
941 bad_seqno:
942 	trace_rpcgss_svc_seqno_bad(rqstp, seq, rseqno);
943 	goto out;
944 bad_mic:
945 	trace_rpcgss_svc_mic(rqstp, maj_stat);
946 	goto out;
947 }
948 
949 static inline int
950 total_buf_len(struct xdr_buf *buf)
951 {
952 	return buf->head[0].iov_len + buf->page_len + buf->tail[0].iov_len;
953 }
954 
955 static void
956 fix_priv_head(struct xdr_buf *buf, int pad)
957 {
958 	if (buf->page_len == 0) {
959 		/* We need to adjust head and buf->len in tandem in this
960 		 * case to make svc_defer() work--it finds the original
961 		 * buffer start using buf->len - buf->head[0].iov_len. */
962 		buf->head[0].iov_len -= pad;
963 	}
964 }
965 
966 static int
967 unwrap_priv_data(struct svc_rqst *rqstp, struct xdr_buf *buf, u32 seq, struct gss_ctx *ctx)
968 {
969 	u32 priv_len, maj_stat;
970 	int pad, remaining_len, offset;
971 	u32 rseqno;
972 
973 	clear_bit(RQ_SPLICE_OK, &rqstp->rq_flags);
974 
975 	priv_len = svc_getnl(&buf->head[0]);
976 	if (rqstp->rq_deferred) {
977 		/* Already decrypted last time through! The sequence number
978 		 * check at out_seq is unnecessary but harmless: */
979 		goto out_seq;
980 	}
981 	/* buf->len is the number of bytes from the original start of the
982 	 * request to the end, where head[0].iov_len is just the bytes
983 	 * not yet read from the head, so these two values are different: */
984 	remaining_len = total_buf_len(buf);
985 	if (priv_len > remaining_len)
986 		goto unwrap_failed;
987 	pad = remaining_len - priv_len;
988 	buf->len -= pad;
989 	fix_priv_head(buf, pad);
990 
991 	maj_stat = gss_unwrap(ctx, 0, priv_len, buf);
992 	pad = priv_len - buf->len;
993 	/* The upper layers assume the buffer is aligned on 4-byte boundaries.
994 	 * In the krb5p case, at least, the data ends up offset, so we need to
995 	 * move it around. */
996 	/* XXX: This is very inefficient.  It would be better to either do
997 	 * this while we encrypt, or maybe in the receive code, if we can peak
998 	 * ahead and work out the service and mechanism there. */
999 	offset = xdr_pad_size(buf->head[0].iov_len);
1000 	if (offset) {
1001 		buf->buflen = RPCSVC_MAXPAYLOAD;
1002 		xdr_shift_buf(buf, offset);
1003 		fix_priv_head(buf, pad);
1004 	}
1005 	if (maj_stat != GSS_S_COMPLETE)
1006 		goto bad_unwrap;
1007 out_seq:
1008 	rseqno = svc_getnl(&buf->head[0]);
1009 	if (rseqno != seq)
1010 		goto bad_seqno;
1011 	return 0;
1012 
1013 unwrap_failed:
1014 	trace_rpcgss_svc_unwrap_failed(rqstp);
1015 	return -EINVAL;
1016 bad_seqno:
1017 	trace_rpcgss_svc_seqno_bad(rqstp, seq, rseqno);
1018 	return -EINVAL;
1019 bad_unwrap:
1020 	trace_rpcgss_svc_unwrap(rqstp, maj_stat);
1021 	return -EINVAL;
1022 }
1023 
1024 struct gss_svc_data {
1025 	/* decoded gss client cred: */
1026 	struct rpc_gss_wire_cred	clcred;
1027 	/* save a pointer to the beginning of the encoded verifier,
1028 	 * for use in encryption/checksumming in svcauth_gss_release: */
1029 	__be32				*verf_start;
1030 	struct rsc			*rsci;
1031 };
1032 
1033 static int
1034 svcauth_gss_set_client(struct svc_rqst *rqstp)
1035 {
1036 	struct gss_svc_data *svcdata = rqstp->rq_auth_data;
1037 	struct rsc *rsci = svcdata->rsci;
1038 	struct rpc_gss_wire_cred *gc = &svcdata->clcred;
1039 	int stat;
1040 
1041 	/*
1042 	 * A gss export can be specified either by:
1043 	 * 	export	*(sec=krb5,rw)
1044 	 * or by
1045 	 * 	export gss/krb5(rw)
1046 	 * The latter is deprecated; but for backwards compatibility reasons
1047 	 * the nfsd code will still fall back on trying it if the former
1048 	 * doesn't work; so we try to make both available to nfsd, below.
1049 	 */
1050 	rqstp->rq_gssclient = find_gss_auth_domain(rsci->mechctx, gc->gc_svc);
1051 	if (rqstp->rq_gssclient == NULL)
1052 		return SVC_DENIED;
1053 	stat = svcauth_unix_set_client(rqstp);
1054 	if (stat == SVC_DROP || stat == SVC_CLOSE)
1055 		return stat;
1056 	return SVC_OK;
1057 }
1058 
1059 static inline int
1060 gss_write_init_verf(struct cache_detail *cd, struct svc_rqst *rqstp,
1061 		struct xdr_netobj *out_handle, int *major_status)
1062 {
1063 	struct rsc *rsci;
1064 	int        rc;
1065 
1066 	if (*major_status != GSS_S_COMPLETE)
1067 		return gss_write_null_verf(rqstp);
1068 	rsci = gss_svc_searchbyctx(cd, out_handle);
1069 	if (rsci == NULL) {
1070 		*major_status = GSS_S_NO_CONTEXT;
1071 		return gss_write_null_verf(rqstp);
1072 	}
1073 	rc = gss_write_verf(rqstp, rsci->mechctx, GSS_SEQ_WIN);
1074 	cache_put(&rsci->h, cd);
1075 	return rc;
1076 }
1077 
1078 static inline int
1079 gss_read_common_verf(struct rpc_gss_wire_cred *gc,
1080 		     struct kvec *argv, __be32 *authp,
1081 		     struct xdr_netobj *in_handle)
1082 {
1083 	/* Read the verifier; should be NULL: */
1084 	*authp = rpc_autherr_badverf;
1085 	if (argv->iov_len < 2 * 4)
1086 		return SVC_DENIED;
1087 	if (svc_getnl(argv) != RPC_AUTH_NULL)
1088 		return SVC_DENIED;
1089 	if (svc_getnl(argv) != 0)
1090 		return SVC_DENIED;
1091 	/* Martial context handle and token for upcall: */
1092 	*authp = rpc_autherr_badcred;
1093 	if (gc->gc_proc == RPC_GSS_PROC_INIT && gc->gc_ctx.len != 0)
1094 		return SVC_DENIED;
1095 	if (dup_netobj(in_handle, &gc->gc_ctx))
1096 		return SVC_CLOSE;
1097 	*authp = rpc_autherr_badverf;
1098 
1099 	return 0;
1100 }
1101 
1102 static inline int
1103 gss_read_verf(struct rpc_gss_wire_cred *gc,
1104 	      struct kvec *argv, __be32 *authp,
1105 	      struct xdr_netobj *in_handle,
1106 	      struct xdr_netobj *in_token)
1107 {
1108 	struct xdr_netobj tmpobj;
1109 	int res;
1110 
1111 	res = gss_read_common_verf(gc, argv, authp, in_handle);
1112 	if (res)
1113 		return res;
1114 
1115 	if (svc_safe_getnetobj(argv, &tmpobj)) {
1116 		kfree(in_handle->data);
1117 		return SVC_DENIED;
1118 	}
1119 	if (dup_netobj(in_token, &tmpobj)) {
1120 		kfree(in_handle->data);
1121 		return SVC_CLOSE;
1122 	}
1123 
1124 	return 0;
1125 }
1126 
1127 static void gss_free_in_token_pages(struct gssp_in_token *in_token)
1128 {
1129 	u32 inlen;
1130 	int i;
1131 
1132 	i = 0;
1133 	inlen = in_token->page_len;
1134 	while (inlen) {
1135 		if (in_token->pages[i])
1136 			put_page(in_token->pages[i]);
1137 		inlen -= inlen > PAGE_SIZE ? PAGE_SIZE : inlen;
1138 	}
1139 
1140 	kfree(in_token->pages);
1141 	in_token->pages = NULL;
1142 }
1143 
1144 static int gss_read_proxy_verf(struct svc_rqst *rqstp,
1145 			       struct rpc_gss_wire_cred *gc, __be32 *authp,
1146 			       struct xdr_netobj *in_handle,
1147 			       struct gssp_in_token *in_token)
1148 {
1149 	struct kvec *argv = &rqstp->rq_arg.head[0];
1150 	unsigned int length, pgto_offs, pgfrom_offs;
1151 	int pages, i, res, pgto, pgfrom;
1152 	size_t inlen, to_offs, from_offs;
1153 
1154 	res = gss_read_common_verf(gc, argv, authp, in_handle);
1155 	if (res)
1156 		return res;
1157 
1158 	inlen = svc_getnl(argv);
1159 	if (inlen > (argv->iov_len + rqstp->rq_arg.page_len))
1160 		return SVC_DENIED;
1161 
1162 	pages = DIV_ROUND_UP(inlen, PAGE_SIZE);
1163 	in_token->pages = kcalloc(pages, sizeof(struct page *), GFP_KERNEL);
1164 	if (!in_token->pages)
1165 		return SVC_DENIED;
1166 	in_token->page_base = 0;
1167 	in_token->page_len = inlen;
1168 	for (i = 0; i < pages; i++) {
1169 		in_token->pages[i] = alloc_page(GFP_KERNEL);
1170 		if (!in_token->pages[i]) {
1171 			gss_free_in_token_pages(in_token);
1172 			return SVC_DENIED;
1173 		}
1174 	}
1175 
1176 	length = min_t(unsigned int, inlen, argv->iov_len);
1177 	memcpy(page_address(in_token->pages[0]), argv->iov_base, length);
1178 	inlen -= length;
1179 
1180 	to_offs = length;
1181 	from_offs = rqstp->rq_arg.page_base;
1182 	while (inlen) {
1183 		pgto = to_offs >> PAGE_SHIFT;
1184 		pgfrom = from_offs >> PAGE_SHIFT;
1185 		pgto_offs = to_offs & ~PAGE_MASK;
1186 		pgfrom_offs = from_offs & ~PAGE_MASK;
1187 
1188 		length = min_t(unsigned int, inlen,
1189 			 min_t(unsigned int, PAGE_SIZE - pgto_offs,
1190 			       PAGE_SIZE - pgfrom_offs));
1191 		memcpy(page_address(in_token->pages[pgto]) + pgto_offs,
1192 		       page_address(rqstp->rq_arg.pages[pgfrom]) + pgfrom_offs,
1193 		       length);
1194 
1195 		to_offs += length;
1196 		from_offs += length;
1197 		inlen -= length;
1198 	}
1199 	return 0;
1200 }
1201 
1202 static inline int
1203 gss_write_resv(struct kvec *resv, size_t size_limit,
1204 	       struct xdr_netobj *out_handle, struct xdr_netobj *out_token,
1205 	       int major_status, int minor_status)
1206 {
1207 	if (resv->iov_len + 4 > size_limit)
1208 		return -1;
1209 	svc_putnl(resv, RPC_SUCCESS);
1210 	if (svc_safe_putnetobj(resv, out_handle))
1211 		return -1;
1212 	if (resv->iov_len + 3 * 4 > size_limit)
1213 		return -1;
1214 	svc_putnl(resv, major_status);
1215 	svc_putnl(resv, minor_status);
1216 	svc_putnl(resv, GSS_SEQ_WIN);
1217 	if (svc_safe_putnetobj(resv, out_token))
1218 		return -1;
1219 	return 0;
1220 }
1221 
1222 /*
1223  * Having read the cred already and found we're in the context
1224  * initiation case, read the verifier and initiate (or check the results
1225  * of) upcalls to userspace for help with context initiation.  If
1226  * the upcall results are available, write the verifier and result.
1227  * Otherwise, drop the request pending an answer to the upcall.
1228  */
1229 static int svcauth_gss_legacy_init(struct svc_rqst *rqstp,
1230 			struct rpc_gss_wire_cred *gc, __be32 *authp)
1231 {
1232 	struct kvec *argv = &rqstp->rq_arg.head[0];
1233 	struct kvec *resv = &rqstp->rq_res.head[0];
1234 	struct rsi *rsip, rsikey;
1235 	int ret;
1236 	struct sunrpc_net *sn = net_generic(SVC_NET(rqstp), sunrpc_net_id);
1237 
1238 	memset(&rsikey, 0, sizeof(rsikey));
1239 	ret = gss_read_verf(gc, argv, authp,
1240 			    &rsikey.in_handle, &rsikey.in_token);
1241 	if (ret)
1242 		return ret;
1243 
1244 	/* Perform upcall, or find upcall result: */
1245 	rsip = rsi_lookup(sn->rsi_cache, &rsikey);
1246 	rsi_free(&rsikey);
1247 	if (!rsip)
1248 		return SVC_CLOSE;
1249 	if (cache_check(sn->rsi_cache, &rsip->h, &rqstp->rq_chandle) < 0)
1250 		/* No upcall result: */
1251 		return SVC_CLOSE;
1252 
1253 	ret = SVC_CLOSE;
1254 	/* Got an answer to the upcall; use it: */
1255 	if (gss_write_init_verf(sn->rsc_cache, rqstp,
1256 				&rsip->out_handle, &rsip->major_status))
1257 		goto out;
1258 	if (gss_write_resv(resv, PAGE_SIZE,
1259 			   &rsip->out_handle, &rsip->out_token,
1260 			   rsip->major_status, rsip->minor_status))
1261 		goto out;
1262 
1263 	ret = SVC_COMPLETE;
1264 out:
1265 	cache_put(&rsip->h, sn->rsi_cache);
1266 	return ret;
1267 }
1268 
1269 static int gss_proxy_save_rsc(struct cache_detail *cd,
1270 				struct gssp_upcall_data *ud,
1271 				uint64_t *handle)
1272 {
1273 	struct rsc rsci, *rscp = NULL;
1274 	static atomic64_t ctxhctr;
1275 	long long ctxh;
1276 	struct gss_api_mech *gm = NULL;
1277 	time64_t expiry;
1278 	int status = -EINVAL;
1279 
1280 	memset(&rsci, 0, sizeof(rsci));
1281 	/* context handle */
1282 	status = -ENOMEM;
1283 	/* the handle needs to be just a unique id,
1284 	 * use a static counter */
1285 	ctxh = atomic64_inc_return(&ctxhctr);
1286 
1287 	/* make a copy for the caller */
1288 	*handle = ctxh;
1289 
1290 	/* make a copy for the rsc cache */
1291 	if (dup_to_netobj(&rsci.handle, (char *)handle, sizeof(uint64_t)))
1292 		goto out;
1293 	rscp = rsc_lookup(cd, &rsci);
1294 	if (!rscp)
1295 		goto out;
1296 
1297 	/* creds */
1298 	if (!ud->found_creds) {
1299 		/* userspace seem buggy, we should always get at least a
1300 		 * mapping to nobody */
1301 		goto out;
1302 	} else {
1303 		struct timespec64 boot;
1304 
1305 		/* steal creds */
1306 		rsci.cred = ud->creds;
1307 		memset(&ud->creds, 0, sizeof(struct svc_cred));
1308 
1309 		status = -EOPNOTSUPP;
1310 		/* get mech handle from OID */
1311 		gm = gss_mech_get_by_OID(&ud->mech_oid);
1312 		if (!gm)
1313 			goto out;
1314 		rsci.cred.cr_gss_mech = gm;
1315 
1316 		status = -EINVAL;
1317 		/* mech-specific data: */
1318 		status = gss_import_sec_context(ud->out_handle.data,
1319 						ud->out_handle.len,
1320 						gm, &rsci.mechctx,
1321 						&expiry, GFP_KERNEL);
1322 		if (status)
1323 			goto out;
1324 
1325 		getboottime64(&boot);
1326 		expiry -= boot.tv_sec;
1327 	}
1328 
1329 	rsci.h.expiry_time = expiry;
1330 	rscp = rsc_update(cd, &rsci, rscp);
1331 	status = 0;
1332 out:
1333 	rsc_free(&rsci);
1334 	if (rscp)
1335 		cache_put(&rscp->h, cd);
1336 	else
1337 		status = -ENOMEM;
1338 	return status;
1339 }
1340 
1341 static int svcauth_gss_proxy_init(struct svc_rqst *rqstp,
1342 			struct rpc_gss_wire_cred *gc, __be32 *authp)
1343 {
1344 	struct kvec *resv = &rqstp->rq_res.head[0];
1345 	struct xdr_netobj cli_handle;
1346 	struct gssp_upcall_data ud;
1347 	uint64_t handle;
1348 	int status;
1349 	int ret;
1350 	struct net *net = SVC_NET(rqstp);
1351 	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1352 
1353 	memset(&ud, 0, sizeof(ud));
1354 	ret = gss_read_proxy_verf(rqstp, gc, authp,
1355 				  &ud.in_handle, &ud.in_token);
1356 	if (ret)
1357 		return ret;
1358 
1359 	ret = SVC_CLOSE;
1360 
1361 	/* Perform synchronous upcall to gss-proxy */
1362 	status = gssp_accept_sec_context_upcall(net, &ud);
1363 	if (status)
1364 		goto out;
1365 
1366 	trace_rpcgss_svc_accept_upcall(rqstp, ud.major_status, ud.minor_status);
1367 
1368 	switch (ud.major_status) {
1369 	case GSS_S_CONTINUE_NEEDED:
1370 		cli_handle = ud.out_handle;
1371 		break;
1372 	case GSS_S_COMPLETE:
1373 		status = gss_proxy_save_rsc(sn->rsc_cache, &ud, &handle);
1374 		if (status)
1375 			goto out;
1376 		cli_handle.data = (u8 *)&handle;
1377 		cli_handle.len = sizeof(handle);
1378 		break;
1379 	default:
1380 		goto out;
1381 	}
1382 
1383 	/* Got an answer to the upcall; use it: */
1384 	if (gss_write_init_verf(sn->rsc_cache, rqstp,
1385 				&cli_handle, &ud.major_status))
1386 		goto out;
1387 	if (gss_write_resv(resv, PAGE_SIZE,
1388 			   &cli_handle, &ud.out_token,
1389 			   ud.major_status, ud.minor_status))
1390 		goto out;
1391 
1392 	ret = SVC_COMPLETE;
1393 out:
1394 	gss_free_in_token_pages(&ud.in_token);
1395 	gssp_free_upcall_data(&ud);
1396 	return ret;
1397 }
1398 
1399 /*
1400  * Try to set the sn->use_gss_proxy variable to a new value. We only allow
1401  * it to be changed if it's currently undefined (-1). If it's any other value
1402  * then return -EBUSY unless the type wouldn't have changed anyway.
1403  */
1404 static int set_gss_proxy(struct net *net, int type)
1405 {
1406 	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1407 	int ret;
1408 
1409 	WARN_ON_ONCE(type != 0 && type != 1);
1410 	ret = cmpxchg(&sn->use_gss_proxy, -1, type);
1411 	if (ret != -1 && ret != type)
1412 		return -EBUSY;
1413 	return 0;
1414 }
1415 
1416 static bool use_gss_proxy(struct net *net)
1417 {
1418 	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1419 
1420 	/* If use_gss_proxy is still undefined, then try to disable it */
1421 	if (sn->use_gss_proxy == -1)
1422 		set_gss_proxy(net, 0);
1423 	return sn->use_gss_proxy;
1424 }
1425 
1426 #ifdef CONFIG_PROC_FS
1427 
1428 static ssize_t write_gssp(struct file *file, const char __user *buf,
1429 			 size_t count, loff_t *ppos)
1430 {
1431 	struct net *net = PDE_DATA(file_inode(file));
1432 	char tbuf[20];
1433 	unsigned long i;
1434 	int res;
1435 
1436 	if (*ppos || count > sizeof(tbuf)-1)
1437 		return -EINVAL;
1438 	if (copy_from_user(tbuf, buf, count))
1439 		return -EFAULT;
1440 
1441 	tbuf[count] = 0;
1442 	res = kstrtoul(tbuf, 0, &i);
1443 	if (res)
1444 		return res;
1445 	if (i != 1)
1446 		return -EINVAL;
1447 	res = set_gssp_clnt(net);
1448 	if (res)
1449 		return res;
1450 	res = set_gss_proxy(net, 1);
1451 	if (res)
1452 		return res;
1453 	return count;
1454 }
1455 
1456 static ssize_t read_gssp(struct file *file, char __user *buf,
1457 			 size_t count, loff_t *ppos)
1458 {
1459 	struct net *net = PDE_DATA(file_inode(file));
1460 	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1461 	unsigned long p = *ppos;
1462 	char tbuf[10];
1463 	size_t len;
1464 
1465 	snprintf(tbuf, sizeof(tbuf), "%d\n", sn->use_gss_proxy);
1466 	len = strlen(tbuf);
1467 	if (p >= len)
1468 		return 0;
1469 	len -= p;
1470 	if (len > count)
1471 		len = count;
1472 	if (copy_to_user(buf, (void *)(tbuf+p), len))
1473 		return -EFAULT;
1474 	*ppos += len;
1475 	return len;
1476 }
1477 
1478 static const struct proc_ops use_gss_proxy_proc_ops = {
1479 	.proc_open	= nonseekable_open,
1480 	.proc_write	= write_gssp,
1481 	.proc_read	= read_gssp,
1482 };
1483 
1484 static int create_use_gss_proxy_proc_entry(struct net *net)
1485 {
1486 	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1487 	struct proc_dir_entry **p = &sn->use_gssp_proc;
1488 
1489 	sn->use_gss_proxy = -1;
1490 	*p = proc_create_data("use-gss-proxy", S_IFREG | 0600,
1491 			      sn->proc_net_rpc,
1492 			      &use_gss_proxy_proc_ops, net);
1493 	if (!*p)
1494 		return -ENOMEM;
1495 	init_gssp_clnt(sn);
1496 	return 0;
1497 }
1498 
1499 static void destroy_use_gss_proxy_proc_entry(struct net *net)
1500 {
1501 	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1502 
1503 	if (sn->use_gssp_proc) {
1504 		remove_proc_entry("use-gss-proxy", sn->proc_net_rpc);
1505 		clear_gssp_clnt(sn);
1506 	}
1507 }
1508 #else /* CONFIG_PROC_FS */
1509 
1510 static int create_use_gss_proxy_proc_entry(struct net *net)
1511 {
1512 	return 0;
1513 }
1514 
1515 static void destroy_use_gss_proxy_proc_entry(struct net *net) {}
1516 
1517 #endif /* CONFIG_PROC_FS */
1518 
1519 /*
1520  * Accept an rpcsec packet.
1521  * If context establishment, punt to user space
1522  * If data exchange, verify/decrypt
1523  * If context destruction, handle here
1524  * In the context establishment and destruction case we encode
1525  * response here and return SVC_COMPLETE.
1526  */
1527 static int
1528 svcauth_gss_accept(struct svc_rqst *rqstp, __be32 *authp)
1529 {
1530 	struct kvec	*argv = &rqstp->rq_arg.head[0];
1531 	struct kvec	*resv = &rqstp->rq_res.head[0];
1532 	u32		crlen;
1533 	struct gss_svc_data *svcdata = rqstp->rq_auth_data;
1534 	struct rpc_gss_wire_cred *gc;
1535 	struct rsc	*rsci = NULL;
1536 	__be32		*rpcstart;
1537 	__be32		*reject_stat = resv->iov_base + resv->iov_len;
1538 	int		ret;
1539 	struct sunrpc_net *sn = net_generic(SVC_NET(rqstp), sunrpc_net_id);
1540 
1541 	*authp = rpc_autherr_badcred;
1542 	if (!svcdata)
1543 		svcdata = kmalloc(sizeof(*svcdata), GFP_KERNEL);
1544 	if (!svcdata)
1545 		goto auth_err;
1546 	rqstp->rq_auth_data = svcdata;
1547 	svcdata->verf_start = NULL;
1548 	svcdata->rsci = NULL;
1549 	gc = &svcdata->clcred;
1550 
1551 	/* start of rpc packet is 7 u32's back from here:
1552 	 * xid direction rpcversion prog vers proc flavour
1553 	 */
1554 	rpcstart = argv->iov_base;
1555 	rpcstart -= 7;
1556 
1557 	/* credential is:
1558 	 *   version(==1), proc(0,1,2,3), seq, service (1,2,3), handle
1559 	 * at least 5 u32s, and is preceded by length, so that makes 6.
1560 	 */
1561 
1562 	if (argv->iov_len < 5 * 4)
1563 		goto auth_err;
1564 	crlen = svc_getnl(argv);
1565 	if (svc_getnl(argv) != RPC_GSS_VERSION)
1566 		goto auth_err;
1567 	gc->gc_proc = svc_getnl(argv);
1568 	gc->gc_seq = svc_getnl(argv);
1569 	gc->gc_svc = svc_getnl(argv);
1570 	if (svc_safe_getnetobj(argv, &gc->gc_ctx))
1571 		goto auth_err;
1572 	if (crlen != round_up_to_quad(gc->gc_ctx.len) + 5 * 4)
1573 		goto auth_err;
1574 
1575 	if ((gc->gc_proc != RPC_GSS_PROC_DATA) && (rqstp->rq_proc != 0))
1576 		goto auth_err;
1577 
1578 	*authp = rpc_autherr_badverf;
1579 	switch (gc->gc_proc) {
1580 	case RPC_GSS_PROC_INIT:
1581 	case RPC_GSS_PROC_CONTINUE_INIT:
1582 		if (use_gss_proxy(SVC_NET(rqstp)))
1583 			return svcauth_gss_proxy_init(rqstp, gc, authp);
1584 		else
1585 			return svcauth_gss_legacy_init(rqstp, gc, authp);
1586 	case RPC_GSS_PROC_DATA:
1587 	case RPC_GSS_PROC_DESTROY:
1588 		/* Look up the context, and check the verifier: */
1589 		*authp = rpcsec_gsserr_credproblem;
1590 		rsci = gss_svc_searchbyctx(sn->rsc_cache, &gc->gc_ctx);
1591 		if (!rsci)
1592 			goto auth_err;
1593 		switch (gss_verify_header(rqstp, rsci, rpcstart, gc, authp)) {
1594 		case SVC_OK:
1595 			break;
1596 		case SVC_DENIED:
1597 			goto auth_err;
1598 		case SVC_DROP:
1599 			goto drop;
1600 		}
1601 		break;
1602 	default:
1603 		*authp = rpc_autherr_rejectedcred;
1604 		goto auth_err;
1605 	}
1606 
1607 	/* now act upon the command: */
1608 	switch (gc->gc_proc) {
1609 	case RPC_GSS_PROC_DESTROY:
1610 		if (gss_write_verf(rqstp, rsci->mechctx, gc->gc_seq))
1611 			goto auth_err;
1612 		/* Delete the entry from the cache_list and call cache_put */
1613 		sunrpc_cache_unhash(sn->rsc_cache, &rsci->h);
1614 		if (resv->iov_len + 4 > PAGE_SIZE)
1615 			goto drop;
1616 		svc_putnl(resv, RPC_SUCCESS);
1617 		goto complete;
1618 	case RPC_GSS_PROC_DATA:
1619 		*authp = rpcsec_gsserr_ctxproblem;
1620 		svcdata->verf_start = resv->iov_base + resv->iov_len;
1621 		if (gss_write_verf(rqstp, rsci->mechctx, gc->gc_seq))
1622 			goto auth_err;
1623 		rqstp->rq_cred = rsci->cred;
1624 		get_group_info(rsci->cred.cr_group_info);
1625 		*authp = rpc_autherr_badcred;
1626 		switch (gc->gc_svc) {
1627 		case RPC_GSS_SVC_NONE:
1628 			break;
1629 		case RPC_GSS_SVC_INTEGRITY:
1630 			/* placeholders for length and seq. number: */
1631 			svc_putnl(resv, 0);
1632 			svc_putnl(resv, 0);
1633 			if (unwrap_integ_data(rqstp, &rqstp->rq_arg,
1634 					gc->gc_seq, rsci->mechctx))
1635 				goto garbage_args;
1636 			rqstp->rq_auth_slack = RPC_MAX_AUTH_SIZE;
1637 			break;
1638 		case RPC_GSS_SVC_PRIVACY:
1639 			/* placeholders for length and seq. number: */
1640 			svc_putnl(resv, 0);
1641 			svc_putnl(resv, 0);
1642 			if (unwrap_priv_data(rqstp, &rqstp->rq_arg,
1643 					gc->gc_seq, rsci->mechctx))
1644 				goto garbage_args;
1645 			rqstp->rq_auth_slack = RPC_MAX_AUTH_SIZE * 2;
1646 			break;
1647 		default:
1648 			goto auth_err;
1649 		}
1650 		svcdata->rsci = rsci;
1651 		cache_get(&rsci->h);
1652 		rqstp->rq_cred.cr_flavor = gss_svc_to_pseudoflavor(
1653 					rsci->mechctx->mech_type,
1654 					GSS_C_QOP_DEFAULT,
1655 					gc->gc_svc);
1656 		ret = SVC_OK;
1657 		trace_rpcgss_svc_authenticate(rqstp, gc);
1658 		goto out;
1659 	}
1660 garbage_args:
1661 	ret = SVC_GARBAGE;
1662 	goto out;
1663 auth_err:
1664 	/* Restore write pointer to its original value: */
1665 	xdr_ressize_check(rqstp, reject_stat);
1666 	ret = SVC_DENIED;
1667 	goto out;
1668 complete:
1669 	ret = SVC_COMPLETE;
1670 	goto out;
1671 drop:
1672 	ret = SVC_CLOSE;
1673 out:
1674 	if (rsci)
1675 		cache_put(&rsci->h, sn->rsc_cache);
1676 	return ret;
1677 }
1678 
1679 static __be32 *
1680 svcauth_gss_prepare_to_wrap(struct xdr_buf *resbuf, struct gss_svc_data *gsd)
1681 {
1682 	__be32 *p;
1683 	u32 verf_len;
1684 
1685 	p = gsd->verf_start;
1686 	gsd->verf_start = NULL;
1687 
1688 	/* If the reply stat is nonzero, don't wrap: */
1689 	if (*(p-1) != rpc_success)
1690 		return NULL;
1691 	/* Skip the verifier: */
1692 	p += 1;
1693 	verf_len = ntohl(*p++);
1694 	p += XDR_QUADLEN(verf_len);
1695 	/* move accept_stat to right place: */
1696 	memcpy(p, p + 2, 4);
1697 	/* Also don't wrap if the accept stat is nonzero: */
1698 	if (*p != rpc_success) {
1699 		resbuf->head[0].iov_len -= 2 * 4;
1700 		return NULL;
1701 	}
1702 	p++;
1703 	return p;
1704 }
1705 
1706 static inline int
1707 svcauth_gss_wrap_resp_integ(struct svc_rqst *rqstp)
1708 {
1709 	struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data;
1710 	struct rpc_gss_wire_cred *gc = &gsd->clcred;
1711 	struct xdr_buf *resbuf = &rqstp->rq_res;
1712 	struct xdr_buf integ_buf;
1713 	struct xdr_netobj mic;
1714 	struct kvec *resv;
1715 	__be32 *p;
1716 	int integ_offset, integ_len;
1717 	int stat = -EINVAL;
1718 
1719 	p = svcauth_gss_prepare_to_wrap(resbuf, gsd);
1720 	if (p == NULL)
1721 		goto out;
1722 	integ_offset = (u8 *)(p + 1) - (u8 *)resbuf->head[0].iov_base;
1723 	integ_len = resbuf->len - integ_offset;
1724 	if (integ_len & 3)
1725 		goto out;
1726 	*p++ = htonl(integ_len);
1727 	*p++ = htonl(gc->gc_seq);
1728 	if (xdr_buf_subsegment(resbuf, &integ_buf, integ_offset, integ_len)) {
1729 		WARN_ON_ONCE(1);
1730 		goto out_err;
1731 	}
1732 	if (resbuf->tail[0].iov_base == NULL) {
1733 		if (resbuf->head[0].iov_len + RPC_MAX_AUTH_SIZE > PAGE_SIZE)
1734 			goto out_err;
1735 		resbuf->tail[0].iov_base = resbuf->head[0].iov_base
1736 						+ resbuf->head[0].iov_len;
1737 		resbuf->tail[0].iov_len = 0;
1738 	}
1739 	resv = &resbuf->tail[0];
1740 	mic.data = (u8 *)resv->iov_base + resv->iov_len + 4;
1741 	if (gss_get_mic(gsd->rsci->mechctx, &integ_buf, &mic))
1742 		goto out_err;
1743 	svc_putnl(resv, mic.len);
1744 	memset(mic.data + mic.len, 0,
1745 			round_up_to_quad(mic.len) - mic.len);
1746 	resv->iov_len += XDR_QUADLEN(mic.len) << 2;
1747 	/* not strictly required: */
1748 	resbuf->len += XDR_QUADLEN(mic.len) << 2;
1749 	if (resv->iov_len > PAGE_SIZE)
1750 		goto out_err;
1751 out:
1752 	stat = 0;
1753 out_err:
1754 	return stat;
1755 }
1756 
1757 static inline int
1758 svcauth_gss_wrap_resp_priv(struct svc_rqst *rqstp)
1759 {
1760 	struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data;
1761 	struct rpc_gss_wire_cred *gc = &gsd->clcred;
1762 	struct xdr_buf *resbuf = &rqstp->rq_res;
1763 	struct page **inpages = NULL;
1764 	__be32 *p, *len;
1765 	int offset;
1766 	int pad;
1767 
1768 	p = svcauth_gss_prepare_to_wrap(resbuf, gsd);
1769 	if (p == NULL)
1770 		return 0;
1771 	len = p++;
1772 	offset = (u8 *)p - (u8 *)resbuf->head[0].iov_base;
1773 	*p++ = htonl(gc->gc_seq);
1774 	inpages = resbuf->pages;
1775 	/* XXX: Would be better to write some xdr helper functions for
1776 	 * nfs{2,3,4}xdr.c that place the data right, instead of copying: */
1777 
1778 	/*
1779 	 * If there is currently tail data, make sure there is
1780 	 * room for the head, tail, and 2 * RPC_MAX_AUTH_SIZE in
1781 	 * the page, and move the current tail data such that
1782 	 * there is RPC_MAX_AUTH_SIZE slack space available in
1783 	 * both the head and tail.
1784 	 */
1785 	if (resbuf->tail[0].iov_base) {
1786 		if (resbuf->tail[0].iov_base >=
1787 			resbuf->head[0].iov_base + PAGE_SIZE)
1788 			return -EINVAL;
1789 		if (resbuf->tail[0].iov_base < resbuf->head[0].iov_base)
1790 			return -EINVAL;
1791 		if (resbuf->tail[0].iov_len + resbuf->head[0].iov_len
1792 				+ 2 * RPC_MAX_AUTH_SIZE > PAGE_SIZE)
1793 			return -ENOMEM;
1794 		memmove(resbuf->tail[0].iov_base + RPC_MAX_AUTH_SIZE,
1795 			resbuf->tail[0].iov_base,
1796 			resbuf->tail[0].iov_len);
1797 		resbuf->tail[0].iov_base += RPC_MAX_AUTH_SIZE;
1798 	}
1799 	/*
1800 	 * If there is no current tail data, make sure there is
1801 	 * room for the head data, and 2 * RPC_MAX_AUTH_SIZE in the
1802 	 * allotted page, and set up tail information such that there
1803 	 * is RPC_MAX_AUTH_SIZE slack space available in both the
1804 	 * head and tail.
1805 	 */
1806 	if (resbuf->tail[0].iov_base == NULL) {
1807 		if (resbuf->head[0].iov_len + 2*RPC_MAX_AUTH_SIZE > PAGE_SIZE)
1808 			return -ENOMEM;
1809 		resbuf->tail[0].iov_base = resbuf->head[0].iov_base
1810 			+ resbuf->head[0].iov_len + RPC_MAX_AUTH_SIZE;
1811 		resbuf->tail[0].iov_len = 0;
1812 	}
1813 	if (gss_wrap(gsd->rsci->mechctx, offset, resbuf, inpages))
1814 		return -ENOMEM;
1815 	*len = htonl(resbuf->len - offset);
1816 	pad = 3 - ((resbuf->len - offset - 1)&3);
1817 	p = (__be32 *)(resbuf->tail[0].iov_base + resbuf->tail[0].iov_len);
1818 	memset(p, 0, pad);
1819 	resbuf->tail[0].iov_len += pad;
1820 	resbuf->len += pad;
1821 	return 0;
1822 }
1823 
1824 static int
1825 svcauth_gss_release(struct svc_rqst *rqstp)
1826 {
1827 	struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data;
1828 	struct rpc_gss_wire_cred *gc = &gsd->clcred;
1829 	struct xdr_buf *resbuf = &rqstp->rq_res;
1830 	int stat = -EINVAL;
1831 	struct sunrpc_net *sn = net_generic(SVC_NET(rqstp), sunrpc_net_id);
1832 
1833 	if (gc->gc_proc != RPC_GSS_PROC_DATA)
1834 		goto out;
1835 	/* Release can be called twice, but we only wrap once. */
1836 	if (gsd->verf_start == NULL)
1837 		goto out;
1838 	/* normally not set till svc_send, but we need it here: */
1839 	/* XXX: what for?  Do we mess it up the moment we call svc_putu32
1840 	 * or whatever? */
1841 	resbuf->len = total_buf_len(resbuf);
1842 	switch (gc->gc_svc) {
1843 	case RPC_GSS_SVC_NONE:
1844 		break;
1845 	case RPC_GSS_SVC_INTEGRITY:
1846 		stat = svcauth_gss_wrap_resp_integ(rqstp);
1847 		if (stat)
1848 			goto out_err;
1849 		break;
1850 	case RPC_GSS_SVC_PRIVACY:
1851 		stat = svcauth_gss_wrap_resp_priv(rqstp);
1852 		if (stat)
1853 			goto out_err;
1854 		break;
1855 	/*
1856 	 * For any other gc_svc value, svcauth_gss_accept() already set
1857 	 * the auth_error appropriately; just fall through:
1858 	 */
1859 	}
1860 
1861 out:
1862 	stat = 0;
1863 out_err:
1864 	if (rqstp->rq_client)
1865 		auth_domain_put(rqstp->rq_client);
1866 	rqstp->rq_client = NULL;
1867 	if (rqstp->rq_gssclient)
1868 		auth_domain_put(rqstp->rq_gssclient);
1869 	rqstp->rq_gssclient = NULL;
1870 	if (rqstp->rq_cred.cr_group_info)
1871 		put_group_info(rqstp->rq_cred.cr_group_info);
1872 	rqstp->rq_cred.cr_group_info = NULL;
1873 	if (gsd->rsci)
1874 		cache_put(&gsd->rsci->h, sn->rsc_cache);
1875 	gsd->rsci = NULL;
1876 
1877 	return stat;
1878 }
1879 
1880 static void
1881 svcauth_gss_domain_release_rcu(struct rcu_head *head)
1882 {
1883 	struct auth_domain *dom = container_of(head, struct auth_domain, rcu_head);
1884 	struct gss_domain *gd = container_of(dom, struct gss_domain, h);
1885 
1886 	kfree(dom->name);
1887 	kfree(gd);
1888 }
1889 
1890 static void
1891 svcauth_gss_domain_release(struct auth_domain *dom)
1892 {
1893 	call_rcu(&dom->rcu_head, svcauth_gss_domain_release_rcu);
1894 }
1895 
1896 static struct auth_ops svcauthops_gss = {
1897 	.name		= "rpcsec_gss",
1898 	.owner		= THIS_MODULE,
1899 	.flavour	= RPC_AUTH_GSS,
1900 	.accept		= svcauth_gss_accept,
1901 	.release	= svcauth_gss_release,
1902 	.domain_release = svcauth_gss_domain_release,
1903 	.set_client	= svcauth_gss_set_client,
1904 };
1905 
1906 static int rsi_cache_create_net(struct net *net)
1907 {
1908 	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1909 	struct cache_detail *cd;
1910 	int err;
1911 
1912 	cd = cache_create_net(&rsi_cache_template, net);
1913 	if (IS_ERR(cd))
1914 		return PTR_ERR(cd);
1915 	err = cache_register_net(cd, net);
1916 	if (err) {
1917 		cache_destroy_net(cd, net);
1918 		return err;
1919 	}
1920 	sn->rsi_cache = cd;
1921 	return 0;
1922 }
1923 
1924 static void rsi_cache_destroy_net(struct net *net)
1925 {
1926 	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1927 	struct cache_detail *cd = sn->rsi_cache;
1928 
1929 	sn->rsi_cache = NULL;
1930 	cache_purge(cd);
1931 	cache_unregister_net(cd, net);
1932 	cache_destroy_net(cd, net);
1933 }
1934 
1935 static int rsc_cache_create_net(struct net *net)
1936 {
1937 	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1938 	struct cache_detail *cd;
1939 	int err;
1940 
1941 	cd = cache_create_net(&rsc_cache_template, net);
1942 	if (IS_ERR(cd))
1943 		return PTR_ERR(cd);
1944 	err = cache_register_net(cd, net);
1945 	if (err) {
1946 		cache_destroy_net(cd, net);
1947 		return err;
1948 	}
1949 	sn->rsc_cache = cd;
1950 	return 0;
1951 }
1952 
1953 static void rsc_cache_destroy_net(struct net *net)
1954 {
1955 	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1956 	struct cache_detail *cd = sn->rsc_cache;
1957 
1958 	sn->rsc_cache = NULL;
1959 	cache_purge(cd);
1960 	cache_unregister_net(cd, net);
1961 	cache_destroy_net(cd, net);
1962 }
1963 
1964 int
1965 gss_svc_init_net(struct net *net)
1966 {
1967 	int rv;
1968 
1969 	rv = rsc_cache_create_net(net);
1970 	if (rv)
1971 		return rv;
1972 	rv = rsi_cache_create_net(net);
1973 	if (rv)
1974 		goto out1;
1975 	rv = create_use_gss_proxy_proc_entry(net);
1976 	if (rv)
1977 		goto out2;
1978 	return 0;
1979 out2:
1980 	destroy_use_gss_proxy_proc_entry(net);
1981 out1:
1982 	rsc_cache_destroy_net(net);
1983 	return rv;
1984 }
1985 
1986 void
1987 gss_svc_shutdown_net(struct net *net)
1988 {
1989 	destroy_use_gss_proxy_proc_entry(net);
1990 	rsi_cache_destroy_net(net);
1991 	rsc_cache_destroy_net(net);
1992 }
1993 
1994 int
1995 gss_svc_init(void)
1996 {
1997 	return svc_auth_register(RPC_AUTH_GSS, &svcauthops_gss);
1998 }
1999 
2000 void
2001 gss_svc_shutdown(void)
2002 {
2003 	svc_auth_unregister(RPC_AUTH_GSS);
2004 }
2005