[linux.git] / net / sunrpc / auth.c

/*
 * linux/net/sunrpc/auth.c
 *
 * Generic RPC client authentication API.
 *
 * Copyright (C) 1996, Olaf Kirch <[email protected]>
 */

#include <linux/types.h>
#include <linux/sched.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/errno.h>
#include <linux/sunrpc/clnt.h>
#include <linux/spinlock.h>

#ifdef RPC_DEBUG
# define RPCDBG_FACILITY	RPCDBG_AUTH
#endif

static struct rpc_authops *	auth_flavors[RPC_AUTH_MAXFLAVOR] = {
	&authnull_ops,		/* AUTH_NULL */
	&authunix_ops,		/* AUTH_UNIX */
	NULL,			/* others can be loadable modules */
};

static u32
pseudoflavor_to_flavor(u32 flavor) {
	if (flavor >= RPC_AUTH_MAXFLAVOR)
		return RPC_AUTH_GSS;
	return flavor;
}

int
rpcauth_register(struct rpc_authops *ops)
{
	rpc_authflavor_t flavor;

	if ((flavor = ops->au_flavor) >= RPC_AUTH_MAXFLAVOR)
		return -EINVAL;
	if (auth_flavors[flavor] != NULL)
		return -EPERM;		/* what else? */
	auth_flavors[flavor] = ops;
	return 0;
}

int
rpcauth_unregister(struct rpc_authops *ops)
{
	rpc_authflavor_t flavor;

	if ((flavor = ops->au_flavor) >= RPC_AUTH_MAXFLAVOR)
		return -EINVAL;
	if (auth_flavors[flavor] != ops)
		return -EPERM;		/* what else? */
	auth_flavors[flavor] = NULL;
	return 0;
}

struct rpc_auth *
rpcauth_create(rpc_authflavor_t pseudoflavor, struct rpc_clnt *clnt)
{
	struct rpc_auth		*auth;
	struct rpc_authops	*ops;
	u32			flavor = pseudoflavor_to_flavor(pseudoflavor);

	auth = ERR_PTR(-EINVAL);
	if (flavor >= RPC_AUTH_MAXFLAVOR)
		goto out;

	/* FIXME - auth_flavors[] really needs an rw lock,
	 * and module refcounting. */
#ifdef CONFIG_KMOD
	if ((ops = auth_flavors[flavor]) == NULL)
		request_module("rpc-auth-%u", flavor);
#endif
	if ((ops = auth_flavors[flavor]) == NULL)
		goto out;
	auth = ops->create(clnt, pseudoflavor);
	if (IS_ERR(auth))
		return auth;
	if (clnt->cl_auth)
		rpcauth_destroy(clnt->cl_auth);
	clnt->cl_auth = auth;

out:
	return auth;
}

void
rpcauth_destroy(struct rpc_auth *auth)
{
	if (!atomic_dec_and_test(&auth->au_count))
		return;
	auth->au_ops->destroy(auth);
}

static DEFINE_SPINLOCK(rpc_credcache_lock);

/*
 * Initialize RPC credential cache
 */
int
rpcauth_init_credcache(struct rpc_auth *auth, unsigned long expire)
{
	struct rpc_cred_cache *new;
	int i;

	new = kmalloc(sizeof(*new), GFP_KERNEL);
	if (!new)
		return -ENOMEM;
	for (i = 0; i < RPC_CREDCACHE_NR; i++)
		INIT_HLIST_HEAD(&new->hashtable[i]);
	new->expire = expire;
	new->nextgc = jiffies + (expire >> 1);
	auth->au_credcache = new;
	return 0;
}

/*
 * Destroy a list of credentials
 */
static inline
void rpcauth_destroy_credlist(struct hlist_head *head)
{
	struct rpc_cred *cred;

	while (!hlist_empty(head)) {
		cred = hlist_entry(head->first, struct rpc_cred, cr_hash);
		hlist_del_init(&cred->cr_hash);
		put_rpccred(cred);
	}
}

/*
 * Clear the RPC credential cache, and delete those credentials
 * that are not referenced.
 */
void
rpcauth_free_credcache(struct rpc_auth *auth)
{
	struct rpc_cred_cache *cache = auth->au_credcache;
	HLIST_HEAD(free);
	struct hlist_node *pos, *next;
	struct rpc_cred	*cred;
	int		i;

	spin_lock(&rpc_credcache_lock);
	for (i = 0; i < RPC_CREDCACHE_NR; i++) {
		hlist_for_each_safe(pos, next, &cache->hashtable[i]) {
			cred = hlist_entry(pos, struct rpc_cred, cr_hash);
			__hlist_del(&cred->cr_hash);
			hlist_add_head(&cred->cr_hash, &free);
		}
	}
	spin_unlock(&rpc_credcache_lock);
	rpcauth_destroy_credlist(&free);
}

static void
rpcauth_prune_expired(struct rpc_auth *auth, struct rpc_cred *cred, struct hlist_head *free)
{
	if (atomic_read(&cred->cr_count) != 1)
	       return;
	if (time_after(jiffies, cred->cr_expire + auth->au_credcache->expire))
		cred->cr_flags &= ~RPCAUTH_CRED_UPTODATE;
	if (!(cred->cr_flags & RPCAUTH_CRED_UPTODATE)) {
		__hlist_del(&cred->cr_hash);
		hlist_add_head(&cred->cr_hash, free);
	}
}

/*
 * Remove stale credentials. Avoid sleeping inside the loop.
 */
static void
rpcauth_gc_credcache(struct rpc_auth *auth, struct hlist_head *free)
{
	struct rpc_cred_cache *cache = auth->au_credcache;
	struct hlist_node *pos, *next;
	struct rpc_cred	*cred;
	int		i;

	dprintk("RPC: gc'ing RPC credentials for auth %p\n", auth);
	for (i = 0; i < RPC_CREDCACHE_NR; i++) {
		hlist_for_each_safe(pos, next, &cache->hashtable[i]) {
			cred = hlist_entry(pos, struct rpc_cred, cr_hash);
			rpcauth_prune_expired(auth, cred, free);
		}
	}
	cache->nextgc = jiffies + cache->expire;
}

/*
 * Look up a process' credentials in the authentication cache
 */
struct rpc_cred *
rpcauth_lookup_credcache(struct rpc_auth *auth, struct auth_cred * acred,
		int flags)
{
	struct rpc_cred_cache *cache = auth->au_credcache;
	HLIST_HEAD(free);
	struct hlist_node *pos, *next;
	struct rpc_cred	*new = NULL,
			*cred = NULL;
	int		nr = 0;

	if (!(flags & RPCAUTH_LOOKUP_ROOTCREDS))
		nr = acred->uid & RPC_CREDCACHE_MASK;
retry:
	spin_lock(&rpc_credcache_lock);
	if (time_before(cache->nextgc, jiffies))
		rpcauth_gc_credcache(auth, &free);
	hlist_for_each_safe(pos, next, &cache->hashtable[nr]) {
		struct rpc_cred *entry;
	       	entry = hlist_entry(pos, struct rpc_cred, cr_hash);
		if (entry->cr_ops->crmatch(acred, entry, flags)) {
			hlist_del(&entry->cr_hash);
			cred = entry;
			break;
		}
		rpcauth_prune_expired(auth, entry, &free);
	}
	if (new) {
		if (cred)
			hlist_add_head(&new->cr_hash, &free);
		else
			cred = new;
	}
	if (cred) {
		hlist_add_head(&cred->cr_hash, &cache->hashtable[nr]);
		get_rpccred(cred);
	}
	spin_unlock(&rpc_credcache_lock);

	rpcauth_destroy_credlist(&free);

	if (!cred) {
		new = auth->au_ops->crcreate(auth, acred, flags);
		if (!IS_ERR(new)) {
#ifdef RPC_DEBUG
			new->cr_magic = RPCAUTH_CRED_MAGIC;
#endif
			goto retry;
		} else
			cred = new;
	} else if ((cred->cr_flags & RPCAUTH_CRED_NEW)
			&& cred->cr_ops->cr_init != NULL
			&& !(flags & RPCAUTH_LOOKUP_NEW)) {
		int res = cred->cr_ops->cr_init(auth, cred);
		if (res < 0) {
			put_rpccred(cred);
			cred = ERR_PTR(res);
		}
	}

	return (struct rpc_cred *) cred;
}

struct rpc_cred *
rpcauth_lookupcred(struct rpc_auth *auth, int flags)
{
	struct auth_cred acred = {
		.uid = current->fsuid,
		.gid = current->fsgid,
		.group_info = current->group_info,
	};
	struct rpc_cred *ret;

	dprintk("RPC:     looking up %s cred\n",
		auth->au_ops->au_name);
	get_group_info(acred.group_info);
	ret = auth->au_ops->lookup_cred(auth, &acred, flags);
	put_group_info(acred.group_info);
	return ret;
}

struct rpc_cred *
rpcauth_bindcred(struct rpc_task *task)
{
	struct rpc_auth *auth = task->tk_auth;
	struct auth_cred acred = {
		.uid = current->fsuid,
		.gid = current->fsgid,
		.group_info = current->group_info,
	};
	struct rpc_cred *ret;
	int flags = 0;

	dprintk("RPC: %4d looking up %s cred\n",
		task->tk_pid, task->tk_auth->au_ops->au_name);
	get_group_info(acred.group_info);
	if (task->tk_flags & RPC_TASK_ROOTCREDS)
		flags |= RPCAUTH_LOOKUP_ROOTCREDS;
	ret = auth->au_ops->lookup_cred(auth, &acred, flags);
	if (!IS_ERR(ret))
		task->tk_msg.rpc_cred = ret;
	else
		task->tk_status = PTR_ERR(ret);
	put_group_info(acred.group_info);
	return ret;
}

void
rpcauth_holdcred(struct rpc_task *task)
{
	dprintk("RPC: %4d holding %s cred %p\n",
		task->tk_pid, task->tk_auth->au_ops->au_name, task->tk_msg.rpc_cred);
	if (task->tk_msg.rpc_cred)
		get_rpccred(task->tk_msg.rpc_cred);
}

void
put_rpccred(struct rpc_cred *cred)
{
	cred->cr_expire = jiffies;
	if (!atomic_dec_and_test(&cred->cr_count))
		return;
	cred->cr_ops->crdestroy(cred);
}

void
rpcauth_unbindcred(struct rpc_task *task)
{
	struct rpc_cred	*cred = task->tk_msg.rpc_cred;

	dprintk("RPC: %4d releasing %s cred %p\n",
		task->tk_pid, task->tk_auth->au_ops->au_name, cred);

	put_rpccred(cred);
	task->tk_msg.rpc_cred = NULL;
}

u32 *
rpcauth_marshcred(struct rpc_task *task, u32 *p)
{
	struct rpc_cred	*cred = task->tk_msg.rpc_cred;

	dprintk("RPC: %4d marshaling %s cred %p\n",
		task->tk_pid, task->tk_auth->au_ops->au_name, cred);

	return cred->cr_ops->crmarshal(task, p);
}

u32 *
rpcauth_checkverf(struct rpc_task *task, u32 *p)
{
	struct rpc_cred	*cred = task->tk_msg.rpc_cred;

	dprintk("RPC: %4d validating %s cred %p\n",
		task->tk_pid, task->tk_auth->au_ops->au_name, cred);

	return cred->cr_ops->crvalidate(task, p);
}

int
rpcauth_wrap_req(struct rpc_task *task, kxdrproc_t encode, void *rqstp,
		u32 *data, void *obj)
{
	struct rpc_cred *cred = task->tk_msg.rpc_cred;

	dprintk("RPC: %4d using %s cred %p to wrap rpc data\n",
			task->tk_pid, cred->cr_ops->cr_name, cred);
	if (cred->cr_ops->crwrap_req)
		return cred->cr_ops->crwrap_req(task, encode, rqstp, data, obj);
	/* By default, we encode the arguments normally. */
	return encode(rqstp, data, obj);
}

int
rpcauth_unwrap_resp(struct rpc_task *task, kxdrproc_t decode, void *rqstp,
		u32 *data, void *obj)
{
	struct rpc_cred *cred = task->tk_msg.rpc_cred;

	dprintk("RPC: %4d using %s cred %p to unwrap rpc data\n",
			task->tk_pid, cred->cr_ops->cr_name, cred);
	if (cred->cr_ops->crunwrap_resp)
		return cred->cr_ops->crunwrap_resp(task, decode, rqstp,
						   data, obj);
	/* By default, we decode the arguments normally. */
	return decode(rqstp, data, obj);
}

int
rpcauth_refreshcred(struct rpc_task *task)
{
	struct rpc_cred	*cred = task->tk_msg.rpc_cred;
	int err;

	dprintk("RPC: %4d refreshing %s cred %p\n",
		task->tk_pid, task->tk_auth->au_ops->au_name, cred);

	err = cred->cr_ops->crrefresh(task);
	if (err < 0)
		task->tk_status = err;
	return err;
}

void
rpcauth_invalcred(struct rpc_task *task)
{
	dprintk("RPC: %4d invalidating %s cred %p\n",
		task->tk_pid, task->tk_auth->au_ops->au_name, task->tk_msg.rpc_cred);
	spin_lock(&rpc_credcache_lock);
	if (task->tk_msg.rpc_cred)
		task->tk_msg.rpc_cred->cr_flags &= ~RPCAUTH_CRED_UPTODATE;
	spin_unlock(&rpc_credcache_lock);
}

int
rpcauth_uptodatecred(struct rpc_task *task)
{
	return !(task->tk_msg.rpc_cred) ||
		(task->tk_msg.rpc_cred->cr_flags & RPCAUTH_CRED_UPTODATE);
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/net/sunrpc/auth.c
	3	*
	4	* Generic RPC client authentication API.
	5	*
	6	* Copyright (C) 1996, Olaf Kirch <[email protected]>
	7	*/
	8
	9	#include <linux/types.h>
	10	#include <linux/sched.h>
	11	#include <linux/module.h>
	12	#include <linux/slab.h>
	13	#include <linux/errno.h>
1da177e4 LT	14	#include <linux/sunrpc/clnt.h>
	15	#include <linux/spinlock.h>
	16
	17	#ifdef RPC_DEBUG
	18	# define RPCDBG_FACILITY RPCDBG_AUTH
	19	#endif
	20
	21	static struct rpc_authops * auth_flavors[RPC_AUTH_MAXFLAVOR] = {
	22	&authnull_ops, /* AUTH_NULL */
	23	&authunix_ops, /* AUTH_UNIX */
	24	NULL, /* others can be loadable modules */
	25	};
	26
	27	static u32
	28	pseudoflavor_to_flavor(u32 flavor) {
	29	if (flavor >= RPC_AUTH_MAXFLAVOR)
	30	return RPC_AUTH_GSS;
	31	return flavor;
	32	}
	33
	34	int
	35	rpcauth_register(struct rpc_authops *ops)
	36	{
	37	rpc_authflavor_t flavor;
	38
	39	if ((flavor = ops->au_flavor) >= RPC_AUTH_MAXFLAVOR)
	40	return -EINVAL;
	41	if (auth_flavors[flavor] != NULL)
	42	return -EPERM; /* what else? */
	43	auth_flavors[flavor] = ops;
	44	return 0;
	45	}
	46
	47	int
	48	rpcauth_unregister(struct rpc_authops *ops)
	49	{
	50	rpc_authflavor_t flavor;
	51
	52	if ((flavor = ops->au_flavor) >= RPC_AUTH_MAXFLAVOR)
	53	return -EINVAL;
	54	if (auth_flavors[flavor] != ops)
	55	return -EPERM; /* what else? */
	56	auth_flavors[flavor] = NULL;
	57	return 0;
	58	}
	59
	60	struct rpc_auth *
	61	rpcauth_create(rpc_authflavor_t pseudoflavor, struct rpc_clnt *clnt)
	62	{
	63	struct rpc_auth *auth;
	64	struct rpc_authops *ops;
	65	u32 flavor = pseudoflavor_to_flavor(pseudoflavor);
	66
f344f6df OK	67	auth = ERR_PTR(-EINVAL);
	68	if (flavor >= RPC_AUTH_MAXFLAVOR)
	69	goto out;
	70
	71	/* FIXME - auth_flavors[] really needs an rw lock,
	72	* and module refcounting. */
	73	#ifdef CONFIG_KMOD
	74	if ((ops = auth_flavors[flavor]) == NULL)
	75	request_module("rpc-auth-%u", flavor);
	76	#endif
	77	if ((ops = auth_flavors[flavor]) == NULL)
	78	goto out;
1da177e4	79	auth = ops->create(clnt, pseudoflavor);
6a19275a BF	80	if (IS_ERR(auth))
6a19275a BF	81	return auth;
1da177e4 LT	82	if (clnt->cl_auth)
	83	rpcauth_destroy(clnt->cl_auth);
	84	clnt->cl_auth = auth;
f344f6df OK	85
f344f6df OK	86	out:
1da177e4 LT	87	return auth;
	88	}
	89
	90	void
	91	rpcauth_destroy(struct rpc_auth *auth)
	92	{
	93	if (!atomic_dec_and_test(&auth->au_count))
	94	return;
	95	auth->au_ops->destroy(auth);
	96	}
	97
	98	static DEFINE_SPINLOCK(rpc_credcache_lock);
	99
	100	/*
	101	* Initialize RPC credential cache
	102	*/
	103	int
	104	rpcauth_init_credcache(struct rpc_auth *auth, unsigned long expire)
	105	{
	106	struct rpc_cred_cache *new;
	107	int i;
	108
8b3a7005	109	new = kmalloc(sizeof(*new), GFP_KERNEL);
1da177e4 LT	110	if (!new)
	111	return -ENOMEM;
	112	for (i = 0; i < RPC_CREDCACHE_NR; i++)
	113	INIT_HLIST_HEAD(&new->hashtable[i]);
	114	new->expire = expire;
	115	new->nextgc = jiffies + (expire >> 1);
	116	auth->au_credcache = new;
	117	return 0;
	118	}
	119
	120	/*
	121	* Destroy a list of credentials
	122	*/
	123	static inline
	124	void rpcauth_destroy_credlist(struct hlist_head *head)
	125	{
	126	struct rpc_cred *cred;
	127
	128	while (!hlist_empty(head)) {
	129	cred = hlist_entry(head->first, struct rpc_cred, cr_hash);
	130	hlist_del_init(&cred->cr_hash);
	131	put_rpccred(cred);
	132	}
	133	}
	134
	135	/*
	136	* Clear the RPC credential cache, and delete those credentials
	137	* that are not referenced.
	138	*/
	139	void
	140	rpcauth_free_credcache(struct rpc_auth *auth)
	141	{
	142	struct rpc_cred_cache *cache = auth->au_credcache;
	143	HLIST_HEAD(free);
	144	struct hlist_node pos, next;
	145	struct rpc_cred *cred;
	146	int i;
	147
	148	spin_lock(&rpc_credcache_lock);
	149	for (i = 0; i < RPC_CREDCACHE_NR; i++) {
	150	hlist_for_each_safe(pos, next, &cache->hashtable[i]) {
	151	cred = hlist_entry(pos, struct rpc_cred, cr_hash);
	152	__hlist_del(&cred->cr_hash);
	153	hlist_add_head(&cred->cr_hash, &free);
	154	}
	155	}
	156	spin_unlock(&rpc_credcache_lock);
	157	rpcauth_destroy_credlist(&free);
	158	}
	159
	160	static void
	161	rpcauth_prune_expired(struct rpc_auth auth, struct rpc_cred cred, struct hlist_head *free)
	162	{
	163	if (atomic_read(&cred->cr_count) != 1)
	164	return;
	165	if (time_after(jiffies, cred->cr_expire + auth->au_credcache->expire))
	166	cred->cr_flags &= ~RPCAUTH_CRED_UPTODATE;
	167	if (!(cred->cr_flags & RPCAUTH_CRED_UPTODATE)) {
	168	__hlist_del(&cred->cr_hash);
	169	hlist_add_head(&cred->cr_hash, free);
	170	}
	171	}
	172
	173	/*
174	* Remove stale credentials. Avoid sleeping inside the loop.
175	*/
176	static void
177	rpcauth_gc_credcache(struct rpc_auth auth, struct hlist_head free)
178	{
179	struct rpc_cred_cache *cache = auth->au_credcache;
180	struct hlist_node pos, next;
181	struct rpc_cred *cred;
182	int i;
183
184	dprintk("RPC: gc'ing RPC credentials for auth %p\n", auth);
185	for (i = 0; i < RPC_CREDCACHE_NR; i++) {
186	hlist_for_each_safe(pos, next, &cache->hashtable[i]) {
187	cred = hlist_entry(pos, struct rpc_cred, cr_hash);
188	rpcauth_prune_expired(auth, cred, free);
189	}
190	}
191	cache->nextgc = jiffies + cache->expire;
192	}
193
194	/*
195	* Look up a process' credentials in the authentication cache
196	*/
197	struct rpc_cred *
198	rpcauth_lookup_credcache(struct rpc_auth auth, struct auth_cred acred,
8a317760	199	int flags)
1da177e4 LT	200	{
	201	struct rpc_cred_cache *cache = auth->au_credcache;
	202	HLIST_HEAD(free);
	203	struct hlist_node pos, next;
	204	struct rpc_cred *new = NULL,
	205	*cred = NULL;
	206	int nr = 0;
	207
8a317760	208	if (!(flags & RPCAUTH_LOOKUP_ROOTCREDS))
1da177e4 LT	209	nr = acred->uid & RPC_CREDCACHE_MASK;
	210	retry:
	211	spin_lock(&rpc_credcache_lock);
	212	if (time_before(cache->nextgc, jiffies))
	213	rpcauth_gc_credcache(auth, &free);
	214	hlist_for_each_safe(pos, next, &cache->hashtable[nr]) {
	215	struct rpc_cred *entry;
	216	entry = hlist_entry(pos, struct rpc_cred, cr_hash);
8a317760	217	if (entry->cr_ops->crmatch(acred, entry, flags)) {
1da177e4 LT	218	hlist_del(&entry->cr_hash);
	219	cred = entry;
	220	break;
	221	}
	222	rpcauth_prune_expired(auth, entry, &free);
	223	}
	224	if (new) {
	225	if (cred)
	226	hlist_add_head(&new->cr_hash, &free);
	227	else
	228	cred = new;
	229	}
	230	if (cred) {
	231	hlist_add_head(&cred->cr_hash, &cache->hashtable[nr]);
	232	get_rpccred(cred);
	233	}
	234	spin_unlock(&rpc_credcache_lock);
	235
	236	rpcauth_destroy_credlist(&free);
	237
	238	if (!cred) {
8a317760	239	new = auth->au_ops->crcreate(auth, acred, flags);
1da177e4 LT	240	if (!IS_ERR(new)) {
	241	#ifdef RPC_DEBUG
	242	new->cr_magic = RPCAUTH_CRED_MAGIC;
	243	#endif
	244	goto retry;
	245	} else
	246	cred = new;
fba3bad4 TM	247	} else if ((cred->cr_flags & RPCAUTH_CRED_NEW)
	248	&& cred->cr_ops->cr_init != NULL
	249	&& !(flags & RPCAUTH_LOOKUP_NEW)) {
	250	int res = cred->cr_ops->cr_init(auth, cred);
	251	if (res < 0) {
	252	put_rpccred(cred);
	253	cred = ERR_PTR(res);
	254	}
1da177e4 LT	255	}
	256
	257	return (struct rpc_cred *) cred;
	258	}
	259
	260	struct rpc_cred *
8a317760	261	rpcauth_lookupcred(struct rpc_auth *auth, int flags)
1da177e4 LT	262	{
	263	struct auth_cred acred = {
	264	.uid = current->fsuid,
	265	.gid = current->fsgid,
	266	.group_info = current->group_info,
	267	};
	268	struct rpc_cred *ret;
	269
	270	dprintk("RPC: looking up %s cred\n",
	271	auth->au_ops->au_name);
	272	get_group_info(acred.group_info);
8a317760	273	ret = auth->au_ops->lookup_cred(auth, &acred, flags);
1da177e4 LT	274	put_group_info(acred.group_info);
	275	return ret;
	276	}
	277
	278	struct rpc_cred *
	279	rpcauth_bindcred(struct rpc_task *task)
	280	{
	281	struct rpc_auth *auth = task->tk_auth;
	282	struct auth_cred acred = {
	283	.uid = current->fsuid,
	284	.gid = current->fsgid,
	285	.group_info = current->group_info,
	286	};
	287	struct rpc_cred *ret;
8a317760	288	int flags = 0;
1da177e4 LT	289
	290	dprintk("RPC: %4d looking up %s cred\n",
	291	task->tk_pid, task->tk_auth->au_ops->au_name);
	292	get_group_info(acred.group_info);
8a317760 TM	293	if (task->tk_flags & RPC_TASK_ROOTCREDS)
	294	flags \|= RPCAUTH_LOOKUP_ROOTCREDS;
	295	ret = auth->au_ops->lookup_cred(auth, &acred, flags);
1da177e4 LT	296	if (!IS_ERR(ret))
	297	task->tk_msg.rpc_cred = ret;
	298	else
	299	task->tk_status = PTR_ERR(ret);
	300	put_group_info(acred.group_info);
	301	return ret;
	302	}
	303
	304	void
	305	rpcauth_holdcred(struct rpc_task *task)
	306	{
	307	dprintk("RPC: %4d holding %s cred %p\n",
	308	task->tk_pid, task->tk_auth->au_ops->au_name, task->tk_msg.rpc_cred);
	309	if (task->tk_msg.rpc_cred)
	310	get_rpccred(task->tk_msg.rpc_cred);
	311	}
	312
	313	void
	314	put_rpccred(struct rpc_cred *cred)
	315	{
	316	cred->cr_expire = jiffies;
	317	if (!atomic_dec_and_test(&cred->cr_count))
	318	return;
	319	cred->cr_ops->crdestroy(cred);
	320	}
	321
	322	void
	323	rpcauth_unbindcred(struct rpc_task *task)
	324	{
1da177e4 LT	325	struct rpc_cred *cred = task->tk_msg.rpc_cred;
	326
	327	dprintk("RPC: %4d releasing %s cred %p\n",
0bbacc40	328	task->tk_pid, task->tk_auth->au_ops->au_name, cred);
1da177e4 LT	329
	330	put_rpccred(cred);
	331	task->tk_msg.rpc_cred = NULL;
	332	}
	333
	334	u32 *
	335	rpcauth_marshcred(struct rpc_task task, u32 p)
	336	{
1da177e4 LT	337	struct rpc_cred *cred = task->tk_msg.rpc_cred;
	338
	339	dprintk("RPC: %4d marshaling %s cred %p\n",
0bbacc40 CL	340	task->tk_pid, task->tk_auth->au_ops->au_name, cred);
0bbacc40 CL	341
1da177e4 LT	342	return cred->cr_ops->crmarshal(task, p);
	343	}
	344
	345	u32 *
	346	rpcauth_checkverf(struct rpc_task task, u32 p)
	347	{
1da177e4 LT	348	struct rpc_cred *cred = task->tk_msg.rpc_cred;
	349
	350	dprintk("RPC: %4d validating %s cred %p\n",
0bbacc40 CL	351	task->tk_pid, task->tk_auth->au_ops->au_name, cred);
0bbacc40 CL	352
1da177e4 LT	353	return cred->cr_ops->crvalidate(task, p);
	354	}
	355
	356	int
	357	rpcauth_wrap_req(struct rpc_task task, kxdrproc_t encode, void rqstp,
	358	u32 data, void obj)
	359	{
	360	struct rpc_cred *cred = task->tk_msg.rpc_cred;
	361
	362	dprintk("RPC: %4d using %s cred %p to wrap rpc data\n",
	363	task->tk_pid, cred->cr_ops->cr_name, cred);
	364	if (cred->cr_ops->crwrap_req)
	365	return cred->cr_ops->crwrap_req(task, encode, rqstp, data, obj);
	366	/* By default, we encode the arguments normally. */
	367	return encode(rqstp, data, obj);
	368	}
	369
	370	int
	371	rpcauth_unwrap_resp(struct rpc_task task, kxdrproc_t decode, void rqstp,
	372	u32 data, void obj)
	373	{
	374	struct rpc_cred *cred = task->tk_msg.rpc_cred;
	375
	376	dprintk("RPC: %4d using %s cred %p to unwrap rpc data\n",
	377	task->tk_pid, cred->cr_ops->cr_name, cred);
	378	if (cred->cr_ops->crunwrap_resp)
	379	return cred->cr_ops->crunwrap_resp(task, decode, rqstp,
	380	data, obj);
	381	/* By default, we decode the arguments normally. */
	382	return decode(rqstp, data, obj);
	383	}
	384
	385	int
	386	rpcauth_refreshcred(struct rpc_task *task)
	387	{
1da177e4 LT	388	struct rpc_cred *cred = task->tk_msg.rpc_cred;
	389	int err;
	390
	391	dprintk("RPC: %4d refreshing %s cred %p\n",
0bbacc40 CL	392	task->tk_pid, task->tk_auth->au_ops->au_name, cred);
0bbacc40 CL	393
1da177e4 LT	394	err = cred->cr_ops->crrefresh(task);
	395	if (err < 0)
	396	task->tk_status = err;
	397	return err;
	398	}
	399
	400	void
	401	rpcauth_invalcred(struct rpc_task *task)
	402	{
	403	dprintk("RPC: %4d invalidating %s cred %p\n",
	404	task->tk_pid, task->tk_auth->au_ops->au_name, task->tk_msg.rpc_cred);
	405	spin_lock(&rpc_credcache_lock);
	406	if (task->tk_msg.rpc_cred)
	407	task->tk_msg.rpc_cred->cr_flags &= ~RPCAUTH_CRED_UPTODATE;
	408	spin_unlock(&rpc_credcache_lock);
	409	}
	410
	411	int
	412	rpcauth_uptodatecred(struct rpc_task *task)
	413	{
	414	return !(task->tk_msg.rpc_cred) \|\|
	415	(task->tk_msg.rpc_cred->cr_flags & RPCAUTH_CRED_UPTODATE);
	416	}