Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

33 files changed, 15934 insertions, 0 deletions

diff --git a/net/sunrpc/Makefile b/net/sunrpc/Makefile
new file mode 100644
index 000000000000..46a2ce00a29b
--- /dev/null
+++ b/net/sunrpc/Makefile
@@ -0,0 +1,15 @@
+#
+# Makefile for Linux kernel SUN RPC
+#
+
+
+obj-$(CONFIG_SUNRPC) += sunrpc.o
+obj-$(CONFIG_SUNRPC_GSS) += auth_gss/
+
+sunrpc-y := clnt.o xprt.o sched.o \
+	    auth.o auth_null.o auth_unix.o \
+	    svc.o svcsock.o svcauth.o svcauth_unix.o \
+	    pmap_clnt.o timer.o xdr.o \
+	    sunrpc_syms.o cache.o rpc_pipe.o
+sunrpc-$(CONFIG_PROC_FS) += stats.o
+sunrpc-$(CONFIG_SYSCTL) += sysctl.o
diff --git a/net/sunrpc/auth.c b/net/sunrpc/auth.c
new file mode 100644
index 000000000000..9bcec9b927b9
--- /dev/null
+++ b/net/sunrpc/auth.c
@@ -0,0 +1,395 @@
+/*
+ * linux/net/sunrpc/auth.c
+ *
+ * Generic RPC client authentication API.
+ *
+ * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
+ */
+
+#include <linux/types.h>
+#include <linux/sched.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/errno.h>
+#include <linux/socket.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);
+
+	if (flavor >= RPC_AUTH_MAXFLAVOR || !(ops = auth_flavors[flavor]))
+		return NULL;
+	auth = ops->create(clnt, pseudoflavor);
+	if (!auth)
+		return NULL;
+	if (clnt->cl_auth)
+		rpcauth_destroy(clnt->cl_auth);
+	clnt->cl_auth = auth;
+	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 = (struct rpc_cred_cache *)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 taskflags)
+{
+	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 (!(taskflags & RPC_TASK_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, taskflags)) {
+			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, taskflags);
+		if (!IS_ERR(new)) {
+#ifdef RPC_DEBUG
+			new->cr_magic = RPCAUTH_CRED_MAGIC;
+#endif
+			goto retry;
+		} else
+			cred = new;
+	}
+
+	return (struct rpc_cred *) cred;
+}
+
+struct rpc_cred *
+rpcauth_lookupcred(struct rpc_auth *auth, int taskflags)
+{
+	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, taskflags);
+	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;
+
+	dprintk("RPC: %4d looking up %s cred\n",
+		task->tk_pid, task->tk_auth->au_ops->au_name);
+	get_group_info(acred.group_info);
+	ret = auth->au_ops->lookup_cred(auth, &acred, task->tk_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_auth	*auth = task->tk_auth;
+	struct rpc_cred	*cred = task->tk_msg.rpc_cred;
+
+	dprintk("RPC: %4d releasing %s cred %p\n",
+		task->tk_pid, 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_auth	*auth = task->tk_auth;
+	struct rpc_cred	*cred = task->tk_msg.rpc_cred;
+
+	dprintk("RPC: %4d marshaling %s cred %p\n",
+		task->tk_pid, auth->au_ops->au_name, cred);
+	return cred->cr_ops->crmarshal(task, p);
+}
+
+u32 *
+rpcauth_checkverf(struct rpc_task *task, u32 *p)
+{
+	struct rpc_auth	*auth = task->tk_auth;
+	struct rpc_cred	*cred = task->tk_msg.rpc_cred;
+
+	dprintk("RPC: %4d validating %s cred %p\n",
+		task->tk_pid, 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_auth	*auth = task->tk_auth;
+	struct rpc_cred	*cred = task->tk_msg.rpc_cred;
+	int err;
+
+	dprintk("RPC: %4d refreshing %s cred %p\n",
+		task->tk_pid, 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);
+}
diff --git a/net/sunrpc/auth_gss/Makefile b/net/sunrpc/auth_gss/Makefile
new file mode 100644
index 000000000000..fe1b874084bc
--- /dev/null
+++ b/net/sunrpc/auth_gss/Makefile
@@ -0,0 +1,18 @@
+#
+# Makefile for Linux kernel rpcsec_gss implementation
+#
+
+obj-$(CONFIG_SUNRPC_GSS) += auth_rpcgss.o
+
+auth_rpcgss-objs := auth_gss.o gss_generic_token.o \
+	gss_mech_switch.o svcauth_gss.o gss_krb5_crypto.o
+
+obj-$(CONFIG_RPCSEC_GSS_KRB5) += rpcsec_gss_krb5.o
+
+rpcsec_gss_krb5-objs := gss_krb5_mech.o gss_krb5_seal.o gss_krb5_unseal.o \
+	gss_krb5_seqnum.o
+
+obj-$(CONFIG_RPCSEC_GSS_SPKM3) += rpcsec_gss_spkm3.o
+
+rpcsec_gss_spkm3-objs := gss_spkm3_mech.o gss_spkm3_seal.o gss_spkm3_unseal.o \
+	gss_spkm3_token.o
diff --git a/net/sunrpc/auth_gss/auth_gss.c b/net/sunrpc/auth_gss/auth_gss.c
new file mode 100644
index 000000000000..a33b627cbef4
--- /dev/null
+++ b/net/sunrpc/auth_gss/auth_gss.c
@@ -0,0 +1,1152 @@
+/*
+ * linux/net/sunrpc/auth_gss.c
+ *
+ * RPCSEC_GSS client authentication.
+ * 
+ *  Copyright (c) 2000 The Regents of the University of Michigan.
+ *  All rights reserved.
+ *
+ *  Dug Song       <dugsong@monkey.org>
+ *  Andy Adamson   <andros@umich.edu>
+ *
+ *  Redistribution and use in source and binary forms, with or without
+ *  modification, are permitted provided that the following conditions
+ *  are met:
+ *
+ *  1. Redistributions of source code must retain the above copyright
+ *     notice, this list of conditions and the following disclaimer.
+ *  2. Redistributions in binary form must reproduce the above copyright
+ *     notice, this list of conditions and the following disclaimer in the
+ *     documentation and/or other materials provided with the distribution.
+ *  3. Neither the name of the University nor the names of its
+ *     contributors may be used to endorse or promote products derived
+ *     from this software without specific prior written permission.
+ *
+ *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+ *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * $Id$
+ */
+
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/slab.h>
+#include <linux/socket.h>
+#include <linux/in.h>
+#include <linux/sched.h>
+#include <linux/sunrpc/clnt.h>
+#include <linux/sunrpc/auth.h>
+#include <linux/sunrpc/auth_gss.h>
+#include <linux/sunrpc/svcauth_gss.h>
+#include <linux/sunrpc/gss_err.h>
+#include <linux/workqueue.h>
+#include <linux/sunrpc/rpc_pipe_fs.h>
+#include <linux/sunrpc/gss_api.h>
+#include <asm/uaccess.h>
+
+static struct rpc_authops authgss_ops;
+
+static struct rpc_credops gss_credops;
+
+#ifdef RPC_DEBUG
+# define RPCDBG_FACILITY	RPCDBG_AUTH
+#endif
+
+#define NFS_NGROUPS	16
+
+#define GSS_CRED_EXPIRE		(60 * HZ)	/* XXX: reasonable? */
+#define GSS_CRED_SLACK		1024		/* XXX: unused */
+/* length of a krb5 verifier (48), plus data added before arguments when
+ * using integrity (two 4-byte integers): */
+#define GSS_VERF_SLACK		56
+
+/* XXX this define must match the gssd define
+* as it is passed to gssd to signal the use of
+* machine creds should be part of the shared rpc interface */
+
+#define CA_RUN_AS_MACHINE  0x00000200 
+
+/* dump the buffer in `emacs-hexl' style */
+#define isprint(c)      ((c > 0x1f) && (c < 0x7f))
+
+static DEFINE_RWLOCK(gss_ctx_lock);
+
+struct gss_auth {
+	struct rpc_auth rpc_auth;
+	struct gss_api_mech *mech;
+	enum rpc_gss_svc service;
+	struct list_head upcalls;
+	struct rpc_clnt *client;
+	struct dentry *dentry;
+	char path[48];
+	spinlock_t lock;
+};
+
+static void gss_destroy_ctx(struct gss_cl_ctx *);
+static struct rpc_pipe_ops gss_upcall_ops;
+
+void
+print_hexl(u32 *p, u_int length, u_int offset)
+{
+	u_int i, j, jm;
+	u8 c, *cp;
+	
+	dprintk("RPC: print_hexl: length %d\n",length);
+	dprintk("\n");
+	cp = (u8 *) p;
+	
+	for (i = 0; i < length; i += 0x10) {
+		dprintk("  %04x: ", (u_int)(i + offset));
+		jm = length - i;
+		jm = jm > 16 ? 16 : jm;
+		
+		for (j = 0; j < jm; j++) {
+			if ((j % 2) == 1)
+				dprintk("%02x ", (u_int)cp[i+j]);
+			else
+				dprintk("%02x", (u_int)cp[i+j]);
+		}
+		for (; j < 16; j++) {
+			if ((j % 2) == 1)
+				dprintk("   ");
+			else
+				dprintk("  ");
+		}
+		dprintk(" ");
+		
+		for (j = 0; j < jm; j++) {
+			c = cp[i+j];
+			c = isprint(c) ? c : '.';
+			dprintk("%c", c);
+		}
+		dprintk("\n");
+	}
+}
+
+EXPORT_SYMBOL(print_hexl);
+
+static inline struct gss_cl_ctx *
+gss_get_ctx(struct gss_cl_ctx *ctx)
+{
+	atomic_inc(&ctx->count);
+	return ctx;
+}
+
+static inline void
+gss_put_ctx(struct gss_cl_ctx *ctx)
+{
+	if (atomic_dec_and_test(&ctx->count))
+		gss_destroy_ctx(ctx);
+}
+
+static void
+gss_cred_set_ctx(struct rpc_cred *cred, struct gss_cl_ctx *ctx)
+{
+	struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base);
+	struct gss_cl_ctx *old;
+	write_lock(&gss_ctx_lock);
+	old = gss_cred->gc_ctx;
+	gss_cred->gc_ctx = ctx;
+	cred->cr_flags |= RPCAUTH_CRED_UPTODATE;
+	write_unlock(&gss_ctx_lock);
+	if (old)
+		gss_put_ctx(old);
+}
+
+static int
+gss_cred_is_uptodate_ctx(struct rpc_cred *cred)
+{
+	struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base);
+	int res = 0;
+
+	read_lock(&gss_ctx_lock);
+	if ((cred->cr_flags & RPCAUTH_CRED_UPTODATE) && gss_cred->gc_ctx)
+		res = 1;
+	read_unlock(&gss_ctx_lock);
+	return res;
+}
+
+static const void *
+simple_get_bytes(const void *p, const void *end, void *res, size_t len)
+{
+	const void *q = (const void *)((const char *)p + len);
+	if (unlikely(q > end || q < p))
+		return ERR_PTR(-EFAULT);
+	memcpy(res, p, len);
+	return q;
+}
+
+static inline const void *
+simple_get_netobj(const void *p, const void *end, struct xdr_netobj *dest)
+{
+	const void *q;
+	unsigned int len;
+
+	p = simple_get_bytes(p, end, &len, sizeof(len));
+	if (IS_ERR(p))
+		return p;
+	q = (const void *)((const char *)p + len);
+	if (unlikely(q > end || q < p))
+		return ERR_PTR(-EFAULT);
+	dest->data = kmalloc(len, GFP_KERNEL);
+	if (unlikely(dest->data == NULL))
+		return ERR_PTR(-ENOMEM);
+	dest->len = len;
+	memcpy(dest->data, p, len);
+	return q;
+}
+
+static struct gss_cl_ctx *
+gss_cred_get_ctx(struct rpc_cred *cred)
+{
+	struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base);
+	struct gss_cl_ctx *ctx = NULL;
+
+	read_lock(&gss_ctx_lock);
+	if (gss_cred->gc_ctx)
+		ctx = gss_get_ctx(gss_cred->gc_ctx);
+	read_unlock(&gss_ctx_lock);
+	return ctx;
+}
+
+static struct gss_cl_ctx *
+gss_alloc_context(void)
+{
+	struct gss_cl_ctx *ctx;
+
+	ctx = kmalloc(sizeof(*ctx), GFP_KERNEL);
+	if (ctx != NULL) {
+		memset(ctx, 0, sizeof(*ctx));
+		ctx->gc_proc = RPC_GSS_PROC_DATA;
+		ctx->gc_seq = 1;	/* NetApp 6.4R1 doesn't accept seq. no. 0 */
+		spin_lock_init(&ctx->gc_seq_lock);
+		atomic_set(&ctx->count,1);
+	}
+	return ctx;
+}
+
+#define GSSD_MIN_TIMEOUT (60 * 60)
+static const void *
+gss_fill_context(const void *p, const void *end, struct gss_cl_ctx *ctx, struct gss_api_mech *gm)
+{
+	const void *q;
+	unsigned int seclen;
+	unsigned int timeout;
+	u32 window_size;
+	int ret;
+
+	/* First unsigned int gives the lifetime (in seconds) of the cred */
+	p = simple_get_bytes(p, end, &timeout, sizeof(timeout));
+	if (IS_ERR(p))
+		goto err;
+	if (timeout == 0)
+		timeout = GSSD_MIN_TIMEOUT;
+	ctx->gc_expiry = jiffies + (unsigned long)timeout * HZ * 3 / 4;
+	/* Sequence number window. Determines the maximum number of simultaneous requests */
+	p = simple_get_bytes(p, end, &window_size, sizeof(window_size));
+	if (IS_ERR(p))
+		goto err;
+	ctx->gc_win = window_size;
+	/* gssd signals an error by passing ctx->gc_win = 0: */
+	if (ctx->gc_win == 0) {
+		/* in which case, p points to  an error code which we ignore */
+		p = ERR_PTR(-EACCES);
+		goto err;
+	}
+	/* copy the opaque wire context */
+	p = simple_get_netobj(p, end, &ctx->gc_wire_ctx);
+	if (IS_ERR(p))
+		goto err;
+	/* import the opaque security context */
+	p  = simple_get_bytes(p, end, &seclen, sizeof(seclen));
+	if (IS_ERR(p))
+		goto err;
+	q = (const void *)((const char *)p + seclen);
+	if (unlikely(q > end || q < p)) {
+		p = ERR_PTR(-EFAULT);
+		goto err;
+	}
+	ret = gss_import_sec_context(p, seclen, gm, &ctx->gc_gss_ctx);
+	if (ret < 0) {
+		p = ERR_PTR(ret);
+		goto err;
+	}
+	return q;
+err:
+	dprintk("RPC:      gss_fill_context returning %ld\n", -PTR_ERR(p));
+	return p;
+}
+
+
+struct gss_upcall_msg {
+	atomic_t count;
+	uid_t	uid;
+	struct rpc_pipe_msg msg;
+	struct list_head list;
+	struct gss_auth *auth;
+	struct rpc_wait_queue rpc_waitqueue;
+	wait_queue_head_t waitqueue;
+	struct gss_cl_ctx *ctx;
+};
+
+static void
+gss_release_msg(struct gss_upcall_msg *gss_msg)
+{
+	if (!atomic_dec_and_test(&gss_msg->count))
+		return;
+	BUG_ON(!list_empty(&gss_msg->list));
+	if (gss_msg->ctx != NULL)
+		gss_put_ctx(gss_msg->ctx);
+	kfree(gss_msg);
+}
+
+static struct gss_upcall_msg *
+__gss_find_upcall(struct gss_auth *gss_auth, uid_t uid)
+{
+	struct gss_upcall_msg *pos;
+	list_for_each_entry(pos, &gss_auth->upcalls, list) {
+		if (pos->uid != uid)
+			continue;
+		atomic_inc(&pos->count);
+		dprintk("RPC:      gss_find_upcall found msg %p\n", pos);
+		return pos;
+	}
+	dprintk("RPC:      gss_find_upcall found nothing\n");
+	return NULL;
+}
+
+/* Try to add a upcall to the pipefs queue.
+ * If an upcall owned by our uid already exists, then we return a reference
+ * to that upcall instead of adding the new upcall.
+ */
+static inline struct gss_upcall_msg *
+gss_add_msg(struct gss_auth *gss_auth, struct gss_upcall_msg *gss_msg)
+{
+	struct gss_upcall_msg *old;
+
+	spin_lock(&gss_auth->lock);
+	old = __gss_find_upcall(gss_auth, gss_msg->uid);
+	if (old == NULL) {
+		atomic_inc(&gss_msg->count);
+		list_add(&gss_msg->list, &gss_auth->upcalls);
+	} else
+		gss_msg = old;
+	spin_unlock(&gss_auth->lock);
+	return gss_msg;
+}
+
+static void
+__gss_unhash_msg(struct gss_upcall_msg *gss_msg)
+{
+	if (list_empty(&gss_msg->list))
+		return;
+	list_del_init(&gss_msg->list);
+	rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno);
+	wake_up_all(&gss_msg->waitqueue);
+	atomic_dec(&gss_msg->count);
+}
+
+static void
+gss_unhash_msg(struct gss_upcall_msg *gss_msg)
+{
+	struct gss_auth *gss_auth = gss_msg->auth;
+
+	spin_lock(&gss_auth->lock);
+	__gss_unhash_msg(gss_msg);
+	spin_unlock(&gss_auth->lock);
+}
+
+static void
+gss_upcall_callback(struct rpc_task *task)
+{
+	struct gss_cred *gss_cred = container_of(task->tk_msg.rpc_cred,
+			struct gss_cred, gc_base);
+	struct gss_upcall_msg *gss_msg = gss_cred->gc_upcall;
+
+	BUG_ON(gss_msg == NULL);
+	if (gss_msg->ctx)
+		gss_cred_set_ctx(task->tk_msg.rpc_cred, gss_get_ctx(gss_msg->ctx));
+	else
+		task->tk_status = gss_msg->msg.errno;
+	spin_lock(&gss_msg->auth->lock);
+	gss_cred->gc_upcall = NULL;
+	rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno);
+	spin_unlock(&gss_msg->auth->lock);
+	gss_release_msg(gss_msg);
+}
+
+static inline struct gss_upcall_msg *
+gss_alloc_msg(struct gss_auth *gss_auth, uid_t uid)
+{
+	struct gss_upcall_msg *gss_msg;
+
+	gss_msg = kmalloc(sizeof(*gss_msg), GFP_KERNEL);
+	if (gss_msg != NULL) {
+		memset(gss_msg, 0, sizeof(*gss_msg));
+		INIT_LIST_HEAD(&gss_msg->list);
+		rpc_init_wait_queue(&gss_msg->rpc_waitqueue, "RPCSEC_GSS upcall waitq");
+		init_waitqueue_head(&gss_msg->waitqueue);
+		atomic_set(&gss_msg->count, 1);
+		gss_msg->msg.data = &gss_msg->uid;
+		gss_msg->msg.len = sizeof(gss_msg->uid);
+		gss_msg->uid = uid;
+		gss_msg->auth = gss_auth;
+	}
+	return gss_msg;
+}
+
+static struct gss_upcall_msg *
+gss_setup_upcall(struct rpc_clnt *clnt, struct gss_auth *gss_auth, struct rpc_cred *cred)
+{
+	struct gss_upcall_msg *gss_new, *gss_msg;
+
+	gss_new = gss_alloc_msg(gss_auth, cred->cr_uid);
+	if (gss_new == NULL)
+		return ERR_PTR(-ENOMEM);
+	gss_msg = gss_add_msg(gss_auth, gss_new);
+	if (gss_msg == gss_new) {
+		int res = rpc_queue_upcall(gss_auth->dentry->d_inode, &gss_new->msg);
+		if (res) {
+			gss_unhash_msg(gss_new);
+			gss_msg = ERR_PTR(res);
+		}
+	} else
+		gss_release_msg(gss_new);
+	return gss_msg;
+}
+
+static inline int
+gss_refresh_upcall(struct rpc_task *task)
+{
+	struct rpc_cred *cred = task->tk_msg.rpc_cred;
+	struct gss_auth *gss_auth = container_of(task->tk_client->cl_auth,
+			struct gss_auth, rpc_auth);
+	struct gss_cred *gss_cred = container_of(cred,
+			struct gss_cred, gc_base);
+	struct gss_upcall_msg *gss_msg;
+	int err = 0;
+
+	dprintk("RPC: %4u gss_refresh_upcall for uid %u\n", task->tk_pid, cred->cr_uid);
+	gss_msg = gss_setup_upcall(task->tk_client, gss_auth, cred);
+	if (IS_ERR(gss_msg)) {
+		err = PTR_ERR(gss_msg);
+		goto out;
+	}
+	spin_lock(&gss_auth->lock);
+	if (gss_cred->gc_upcall != NULL)
+		rpc_sleep_on(&gss_cred->gc_upcall->rpc_waitqueue, task, NULL, NULL);
+	else if (gss_msg->ctx == NULL && gss_msg->msg.errno >= 0) {
+		task->tk_timeout = 0;
+		gss_cred->gc_upcall = gss_msg;
+		/* gss_upcall_callback will release the reference to gss_upcall_msg */
+		atomic_inc(&gss_msg->count);
+		rpc_sleep_on(&gss_msg->rpc_waitqueue, task, gss_upcall_callback, NULL);
+	} else
+		err = gss_msg->msg.errno;
+	spin_unlock(&gss_auth->lock);
+	gss_release_msg(gss_msg);
+out:
+	dprintk("RPC: %4u gss_refresh_upcall for uid %u result %d\n", task->tk_pid,
+			cred->cr_uid, err);
+	return err;
+}