smb: move client and server files to common directory fs/smb

commit 38c8a9a52082579090e34c033d439ed2cd1a462d upstream.

Move CIFS/SMB3 related client and server files (cifs.ko and ksmbd.ko
and helper modules) to new fs/smb subdirectory:

   fs/cifs --> fs/smb/client
   fs/ksmbd --> fs/smb/server
   fs/smbfs_common --> fs/smb/common

Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Acked-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
[ added to stable trees to handle the directory change to handle the
  future stable patches due to the constant churn in this filesystem at
  the moment - gregkh ]
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 0 insertions, 1858 deletions

diff --git a/fs/cifs/sess.c b/fs/cifs/sess.c
deleted file mode 100644
index 81be17845072..000000000000
--- a/fs/cifs/sess.c
+++ /dev/null
@@ -1,1858 +0,0 @@
-// SPDX-License-Identifier: LGPL-2.1
-/*
- *
- *   SMB/CIFS session setup handling routines
- *
- *   Copyright (c) International Business Machines  Corp., 2006, 2009
- *   Author(s): Steve French (sfrench@us.ibm.com)
- *
- */
-
-#include "cifspdu.h"
-#include "cifsglob.h"
-#include "cifsproto.h"
-#include "cifs_unicode.h"
-#include "cifs_debug.h"
-#include "ntlmssp.h"
-#include "nterr.h"
-#include <linux/utsname.h>
-#include <linux/slab.h>
-#include <linux/version.h>
-#include "cifsfs.h"
-#include "cifs_spnego.h"
-#include "smb2proto.h"
-#include "fs_context.h"
-
-static int
-cifs_ses_add_channel(struct cifs_sb_info *cifs_sb, struct cifs_ses *ses,
-		     struct cifs_server_iface *iface);
-
-bool
-is_server_using_iface(struct TCP_Server_Info *server,
-		      struct cifs_server_iface *iface)
-{
-	struct sockaddr_in *i4 = (struct sockaddr_in *)&iface->sockaddr;
-	struct sockaddr_in6 *i6 = (struct sockaddr_in6 *)&iface->sockaddr;
-	struct sockaddr_in *s4 = (struct sockaddr_in *)&server->dstaddr;
-	struct sockaddr_in6 *s6 = (struct sockaddr_in6 *)&server->dstaddr;
-
-	if (server->dstaddr.ss_family != iface->sockaddr.ss_family)
-		return false;
-	if (server->dstaddr.ss_family == AF_INET) {
-		if (s4->sin_addr.s_addr != i4->sin_addr.s_addr)
-			return false;
-	} else if (server->dstaddr.ss_family == AF_INET6) {
-		if (memcmp(&s6->sin6_addr, &i6->sin6_addr,
-			   sizeof(i6->sin6_addr)) != 0)
-			return false;
-	} else {
-		/* unknown family.. */
-		return false;
-	}
-	return true;
-}
-
-bool is_ses_using_iface(struct cifs_ses *ses, struct cifs_server_iface *iface)
-{
-	int i;
-
-	spin_lock(&ses->chan_lock);
-	for (i = 0; i < ses->chan_count; i++) {
-		if (ses->chans[i].iface == iface) {
-			spin_unlock(&ses->chan_lock);
-			return true;
-		}
-	}
-	spin_unlock(&ses->chan_lock);
-	return false;
-}
-
-/* channel helper functions. assumed that chan_lock is held by caller. */
-
-unsigned int
-cifs_ses_get_chan_index(struct cifs_ses *ses,
-			struct TCP_Server_Info *server)
-{
-	unsigned int i;
-
-	for (i = 0; i < ses->chan_count; i++) {
-		if (ses->chans[i].server == server)
-			return i;
-	}
-
-	/* If we didn't find the channel, it is likely a bug */
-	if (server)
-		cifs_dbg(VFS, "unable to get chan index for server: 0x%llx",
-			 server->conn_id);
-	WARN_ON(1);
-	return 0;
-}
-
-void
-cifs_chan_set_in_reconnect(struct cifs_ses *ses,
-			     struct TCP_Server_Info *server)
-{
-	unsigned int chan_index = cifs_ses_get_chan_index(ses, server);
-
-	ses->chans[chan_index].in_reconnect = true;
-}
-
-void
-cifs_chan_clear_in_reconnect(struct cifs_ses *ses,
-			     struct TCP_Server_Info *server)
-{
-	unsigned int chan_index = cifs_ses_get_chan_index(ses, server);
-
-	ses->chans[chan_index].in_reconnect = false;
-}
-
-bool
-cifs_chan_in_reconnect(struct cifs_ses *ses,
-			  struct TCP_Server_Info *server)
-{
-	unsigned int chan_index = cifs_ses_get_chan_index(ses, server);
-
-	return CIFS_CHAN_IN_RECONNECT(ses, chan_index);
-}
-
-void
-cifs_chan_set_need_reconnect(struct cifs_ses *ses,
-			     struct TCP_Server_Info *server)
-{
-	unsigned int chan_index = cifs_ses_get_chan_index(ses, server);
-
-	set_bit(chan_index, &ses->chans_need_reconnect);
-	cifs_dbg(FYI, "Set reconnect bitmask for chan %u; now 0x%lx\n",
-		 chan_index, ses->chans_need_reconnect);
-}
-
-void
-cifs_chan_clear_need_reconnect(struct cifs_ses *ses,
-			       struct TCP_Server_Info *server)
-{
-	unsigned int chan_index = cifs_ses_get_chan_index(ses, server);
-
-	clear_bit(chan_index, &ses->chans_need_reconnect);
-	cifs_dbg(FYI, "Cleared reconnect bitmask for chan %u; now 0x%lx\n",
-		 chan_index, ses->chans_need_reconnect);
-}
-
-bool
-cifs_chan_needs_reconnect(struct cifs_ses *ses,
-			  struct TCP_Server_Info *server)
-{
-	unsigned int chan_index = cifs_ses_get_chan_index(ses, server);
-
-	return CIFS_CHAN_NEEDS_RECONNECT(ses, chan_index);
-}
-
-bool
-cifs_chan_is_iface_active(struct cifs_ses *ses,
-			  struct TCP_Server_Info *server)
-{
-	unsigned int chan_index = cifs_ses_get_chan_index(ses, server);
-
-	return ses->chans[chan_index].iface &&
-		ses->chans[chan_index].iface->is_active;
-}
-
-/* returns number of channels added */
-int cifs_try_adding_channels(struct cifs_sb_info *cifs_sb, struct cifs_ses *ses)
-{
-	struct TCP_Server_Info *server = ses->server;
-	int old_chan_count, new_chan_count;
-	int left;
-	int rc = 0;
-	int tries = 0;
-	struct cifs_server_iface *iface = NULL, *niface = NULL;
-
-	spin_lock(&ses->chan_lock);
-
-	new_chan_count = old_chan_count = ses->chan_count;
-	left = ses->chan_max - ses->chan_count;
-
-	if (left <= 0) {
-		spin_unlock(&ses->chan_lock);
-		cifs_dbg(FYI,
-			 "ses already at max_channels (%zu), nothing to open\n",
-			 ses->chan_max);
-		return 0;
-	}
-
-	if (server->dialect < SMB30_PROT_ID) {
-		spin_unlock(&ses->chan_lock);
-		cifs_dbg(VFS, "multichannel is not supported on this protocol version, use 3.0 or above\n");
-		return 0;
-	}
-
-	if (!(server->capabilities & SMB2_GLOBAL_CAP_MULTI_CHANNEL)) {
-		ses->chan_max = 1;
-		spin_unlock(&ses->chan_lock);
-		cifs_server_dbg(VFS, "no multichannel support\n");
-		return 0;
-	}
-	spin_unlock(&ses->chan_lock);
-
-	/*
-	 * Keep connecting to same, fastest, iface for all channels as
-	 * long as its RSS. Try next fastest one if not RSS or channel
-	 * creation fails.
-	 */
-	spin_lock(&ses->iface_lock);
-	iface = list_first_entry(&ses->iface_list, struct cifs_server_iface,
-				 iface_head);
-	spin_unlock(&ses->iface_lock);
-
-	while (left > 0) {
-
-		tries++;
-		if (tries > 3*ses->chan_max) {
-			cifs_dbg(FYI, "too many channel open attempts (%d channels left to open)\n",
-				 left);
-			break;
-		}
-
-		spin_lock(&ses->iface_lock);
-		if (!ses->iface_count) {
-			spin_unlock(&ses->iface_lock);
-			break;
-		}
-
-		list_for_each_entry_safe_from(iface, niface, &ses->iface_list,
-				    iface_head) {
-			/* skip ifaces that are unusable */
-			if (!iface->is_active ||
-			    (is_ses_using_iface(ses, iface) &&
-			     !iface->rss_capable)) {
-				continue;
-			}
-
-			/* take ref before unlock */
-			kref_get(&iface->refcount);
-
-			spin_unlock(&ses->iface_lock);
-			rc = cifs_ses_add_channel(cifs_sb, ses, iface);
-			spin_lock(&ses->iface_lock);
-
-			if (rc) {
-				cifs_dbg(VFS, "failed to open extra channel on iface:%pIS rc=%d\n",
-					 &iface->sockaddr,
-					 rc);
-				kref_put(&iface->refcount, release_iface);
-				continue;
-			}
-
-			cifs_dbg(FYI, "successfully opened new channel on iface:%pIS\n",
-				 &iface->sockaddr);
-			break;
-		}
-		spin_unlock(&ses->iface_lock);
-
-		left--;
-		new_chan_count++;
-	}
-
-	return new_chan_count - old_chan_count;
-}
-
-/*
- * update the iface for the channel if necessary.
- * will return 0 when iface is updated, 1 if removed, 2 otherwise
- * Must be called with chan_lock held.
- */
-int
-cifs_chan_update_iface(struct cifs_ses *ses, struct TCP_Server_Info *server)
-{
-	unsigned int chan_index;
-	struct cifs_server_iface *iface = NULL;
-	struct cifs_server_iface *old_iface = NULL;
-	int rc = 0;
-
-	spin_lock(&ses->chan_lock);
-	chan_index = cifs_ses_get_chan_index(ses, server);
-	if (!chan_index) {
-		spin_unlock(&ses->chan_lock);
-		return 0;
-	}
-
-	if (ses->chans[chan_index].iface) {
-		old_iface = ses->chans[chan_index].iface;
-		if (old_iface->is_active) {
-			spin_unlock(&ses->chan_lock);
-			return 1;
-		}
-	}
-	spin_unlock(&ses->chan_lock);
-
-	spin_lock(&ses->iface_lock);
-	/* then look for a new one */
-	list_for_each_entry(iface, &ses->iface_list, iface_head) {
-		if (!iface->is_active ||
-		    (is_ses_using_iface(ses, iface) &&
-		     !iface->rss_capable)) {
-			continue;
-		}
-		kref_get(&iface->refcount);
-		break;
-	}
-
-	if (list_entry_is_head(iface, &ses->iface_list, iface_head)) {
-		rc = 1;
-		iface = NULL;
-		cifs_dbg(FYI, "unable to find a suitable iface\n");
-	}
-
-	/* now drop the ref to the current iface */
-	if (old_iface && iface) {
-		cifs_dbg(FYI, "replacing iface: %pIS with %pIS\n",
-			 &old_iface->sockaddr,
-			 &iface->sockaddr);
-		kref_put(&old_iface->refcount, release_iface);
-	} else if (old_iface) {
-		cifs_dbg(FYI, "releasing ref to iface: %pIS\n",
-			 &old_iface->sockaddr);
-		kref_put(&old_iface->refcount, release_iface);
-	} else {
-		WARN_ON(!iface);
-		cifs_dbg(FYI, "adding new iface: %pIS\n", &iface->sockaddr);
-	}
-	spin_unlock(&ses->iface_lock);
-
-	spin_lock(&ses->chan_lock);
-	chan_index = cifs_ses_get_chan_index(ses, server);
-	ses->chans[chan_index].iface = iface;
-
-	/* No iface is found. if secondary chan, drop connection */
-	if (!iface && CIFS_SERVER_IS_CHAN(server))
-		ses->chans[chan_index].server = NULL;
-
-	spin_unlock(&ses->chan_lock);
-
-	if (!iface && CIFS_SERVER_IS_CHAN(server))
-		cifs_put_tcp_session(server, false);
-
-	return rc;
-}
-
-/*
- * If server is a channel of ses, return the corresponding enclosing
- * cifs_chan otherwise return NULL.
- */
-struct cifs_chan *
-cifs_ses_find_chan(struct cifs_ses *ses, struct TCP_Server_Info *server)
-{
-	int i;
-
-	spin_lock(&ses->chan_lock);
-	for (i = 0; i < ses->chan_count; i++) {
-		if (ses->chans[i].server == server) {
-			spin_unlock(&ses->chan_lock);
-			return &ses->chans[i];
-		}
-	}
-	spin_unlock(&ses->chan_lock);
-	return NULL;
-}
-
-static int
-cifs_ses_add_channel(struct cifs_sb_info *cifs_sb, struct cifs_ses *ses,
-		     struct cifs_server_iface *iface)
-{
-	struct TCP_Server_Info *chan_server;
-	struct cifs_chan *chan;
-	struct smb3_fs_context ctx = {NULL};
-	static const char unc_fmt[] = "\\%s\\foo";
-	char unc[sizeof(unc_fmt)+SERVER_NAME_LEN_WITH_NULL] = {0};
-	struct sockaddr_in *ipv4 = (struct sockaddr_in *)&iface->sockaddr;
-	struct sockaddr_in6 *ipv6 = (struct sockaddr_in6 *)&iface->sockaddr;
-	int rc;
-	unsigned int xid = get_xid();
-
-	if (iface->sockaddr.ss_family == AF_INET)
-		cifs_dbg(FYI, "adding channel to ses %p (speed:%zu bps rdma:%s ip:%pI4)\n",
-			 ses, iface->speed, iface->rdma_capable ? "yes" : "no",
-			 &ipv4->sin_addr);
-	else
-		cifs_dbg(FYI, "adding channel to ses %p (speed:%zu bps rdma:%s ip:%pI6)\n",
-			 ses, iface->speed, iface->rdma_capable ? "yes" : "no",
-			 &ipv6->sin6_addr);
-
-	/*
-	 * Setup a ctx with mostly the same info as the existing
-	 * session and overwrite it with the requested iface data.
-	 *
-	 * We need to setup at least the fields used for negprot and
-	 * sesssetup.
-	 *
-	 * We only need the ctx here, so we can reuse memory from
-	 * the session and server without caring about memory
-	 * management.
-	 */
-
-	/* Always make new connection for now (TODO?) */
-	ctx.nosharesock = true;
-
-	/* Auth */
-	ctx.domainauto = ses->domainAuto;
-	ctx.domainname = ses->domainName;
-
-	/* no hostname for extra channels */
-	ctx.server_hostname = "";
-
-	ctx.username = ses->user_name;
-	ctx.password = ses->password;
-	ctx.sectype = ses->sectype;
-	ctx.sign = ses->sign;
-
-	/* UNC and paths */
-	/* XXX: Use ses->server->hostname? */
-	sprintf(unc, unc_fmt, ses->ip_addr);
-	ctx.UNC = unc;
-	ctx.prepath = "";
-
-	/* Reuse same version as master connection */
-	ctx.vals = ses->server->vals;
-	ctx.ops = ses->server->ops;
-
-	ctx.noblocksnd = ses->server->noblocksnd;
-	ctx.noautotune = ses->server->noautotune;
-	ctx.sockopt_tcp_nodelay = ses->server->tcp_nodelay;
-	ctx.echo_interval = ses->server->echo_interval / HZ;
-	ctx.max_credits = ses->server->max_credits;
-
-	/*
-	 * This will be used for encoding/decoding user/domain/pw
-	 * during sess setup auth.
-	 */
-	ctx.local_nls = cifs_sb->local_nls;
-
-	/* Use RDMA if possible */
-	ctx.rdma = iface->rdma_capable;
-	memcpy(&ctx.dstaddr, &iface->sockaddr, sizeof(struct sockaddr_storage));
-
-	/* reuse master con client guid */
-	memcpy(&ctx.client_guid, ses->server->client_guid,
-	       SMB2_CLIENT_GUID_SIZE);
-	ctx.use_client_guid = true;
-
-	chan_server = cifs_get_tcp_session(&ctx, ses->server);
-
-	spin_lock(&ses->chan_lock);
-	chan = &ses->chans[ses->chan_count];
-	chan->server = chan_server;
-	if (IS_ERR(chan->server)) {
-		rc = PTR_ERR(chan->server);
-		chan->server = NULL;
-		spin_unlock(&ses->chan_lock);
-		goto out;
-	}
-	chan->iface = iface;
-	ses->chan_count++;
-	atomic_set(&ses->chan_seq, 0);
-
-	/* Mark this channel as needing connect/setup */
-	cifs_chan_set_need_reconnect(ses, chan->server);
-
-	spin_unlock(&ses->chan_lock);
-
-	mutex_lock(&ses->session_mutex);
-	/*
-	 * We need to allocate the server crypto now as we will need
-	 * to sign packets before we generate the channel signing key
-	 * (we sign with the session key)
-	 */
-	rc = smb311_crypto_shash_allocate(chan->server);
-	if (rc) {
-		cifs_dbg(VFS, "%s: crypto alloc failed\n", __func__);
-		mutex_unlock(&ses->session_mutex);
-		goto out;
-	}
-
-	rc = cifs_negotiate_protocol(xid, ses, chan->server);
-	if (!rc)
-		rc = cifs_setup_session(xid, ses, chan->server, cifs_sb->local_nls);
-
-	mutex_unlock(&ses->session_mutex);
-
-out:
-	if (rc && chan->server) {
-		/*
-		 * we should avoid race with these delayed works before we
-		 * remove this channel
-		 */
-		cancel_delayed_work_sync(&chan->server->echo);
-		cancel_delayed_work_sync(&chan->server->resolve);
-		cancel_delayed_work_sync(&chan->server->reconnect);
-
-		spin_lock(&ses->chan_lock);
-		/* we rely on all bits beyond chan_count to be clear */
-		cifs_chan_clear_need_reconnect(ses, chan->server);
-		ses->chan_count--;
-		/*
-		 * chan_count should never reach 0 as at least the primary
-		 * channel is always allocated
-		 */
-		WARN_ON(ses->chan_count < 1);
-		spin_unlock(&ses->chan_lock);
-
-		cifs_put_tcp_session(chan->server, 0);
-	}
-
-	free_xid(xid);
-	return rc;
-}
-
-#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
-static __u32 cifs_ssetup_hdr(struct cifs_ses *ses,
-			     struct TCP_Server_Info *server,
-			     SESSION_SETUP_ANDX *pSMB)
-{
-	__u32 capabilities = 0;
-
-	/* init fields common to all four types of SessSetup */
-	/* Note that offsets for first seven fields in req struct are same  */
-	/*	in CIFS Specs so does not matter which of 3 forms of struct */
-	/*	that we use in next few lines                               */
-	/* Note that header is initialized to zero in header_assemble */
-	pSMB->req.AndXCommand = 0xFF;
-	pSMB->req.MaxBufferSize = cpu_to_le16(min_t(u32,
-					CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4,
-					USHRT_MAX));
-	pSMB->req.MaxMpxCount = cpu_to_le16(server->maxReq);
-	pSMB->req.VcNumber = cpu_to_le16(1);
-
-	/* Now no need to set SMBFLG_CASELESS or obsolete CANONICAL PATH */
-
-	/* BB verify whether signing required on neg or just on auth frame
-	   (and NTLM case) */
-
-	capabilities = CAP_LARGE_FILES | CAP_NT_SMBS | CAP_LEVEL_II_OPLOCKS |
-			CAP_LARGE_WRITE_X | CAP_LARGE_READ_X;
-
-	if (server->sign)
-		pSMB->req.hdr.Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
-
-	if (ses->capabilities & CAP_UNICODE) {
-		pSMB->req.hdr.Flags2 |= SMBFLG2_UNICODE;
-		capabilities |= CAP_UNICODE;
-	}
-	if (ses->capabilities & CAP_STATUS32) {
-		pSMB->req.hdr.Flags2 |= SMBFLG2_ERR_STATUS;
-		capabilities |= CAP_STATUS32;
-	}
-	if (ses->capabilities & CAP_DFS) {
-		pSMB->req.hdr.Flags2 |= SMBFLG2_DFS;
-		capabilities |= CAP_DFS;
-	}
-	if (ses->capabilities & CAP_UNIX)
-		capabilities |= CAP_UNIX;
-
-	return capabilities;
-}
-
-static void
-unicode_oslm_strings(char **pbcc_area, const struct nls_table *nls_cp)
-{
-	char *bcc_ptr = *pbcc_area;
-	int bytes_ret = 0;
-
-	/* Copy OS version */
-	bytes_ret = cifs_strtoUTF16((__le16 *)bcc_ptr, "Linux version ", 32,
-				    nls_cp);
-	bcc_ptr += 2 * bytes_ret;
-	bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, init_utsname()->release,
-				    32, nls_cp);
-	bcc_ptr += 2 * bytes_ret;
-	bcc_ptr += 2; /* trailing null */
-
-	bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, CIFS_NETWORK_OPSYS,
-				    32, nls_cp);
-	bcc_ptr += 2 * bytes_ret;
-	bcc_ptr += 2; /* trailing null */
-
-	*pbcc_area = bcc_ptr;
-}
-
-static void unicode_domain_string(char **pbcc_area, struct cifs_ses *ses,
-				   const struct nls_table *nls_cp)
-{
-	char *bcc_ptr = *pbcc_area;
-	int bytes_ret = 0;
-
-	/* copy domain */
-	if (ses->domainName == NULL) {
-		/* Sending null domain better than using a bogus domain name (as
-		we did briefly in 2.6.18) since server will use its default */
-		*bcc_ptr = 0;
-		*(bcc_ptr+1) = 0;
-		bytes_ret = 0;
-	} else
-		bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, ses->domainName,
-					    CIFS_MAX_DOMAINNAME_LEN, nls_cp);
-	bcc_ptr += 2 * bytes_ret;
-	bcc_ptr += 2;  /* account for null terminator */
-
-	*pbcc_area = bcc_ptr;
-}
-
-static void unicode_ssetup_strings(char **pbcc_area, struct cifs_ses *ses,
-				   const struct nls_table *nls_cp)
-{
-	char *bcc_ptr = *pbcc_area;
-	int bytes_ret = 0;
-
-	/* BB FIXME add check that strings total less
-	than 335 or will need to send them as arrays */
-
-	/* copy user */
-	if (ses->user_name == NULL) {
-		/* null user mount */
-		*bcc_ptr = 0;
-		*(bcc_ptr+1) = 0;
-	} else {
-		bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, ses->user_name,
-					    CIFS_MAX_USERNAME_LEN, nls_cp);
-	}
-	bcc_ptr += 2 * bytes_ret;
-	bcc_ptr += 2; /* account for null termination */
-
-	unicode_domain_string(&bcc_ptr, ses, nls_cp);
-	unicode_oslm_strings(&bcc_ptr, nls_cp);
-
-	*pbcc_area = bcc_ptr;
-}
-
-static void ascii_ssetup_strings(char **pbcc_area, struct cifs_ses *ses,
-				 const struct nls_table *nls_cp)
-{
-	char *bcc_ptr = *pbcc_area;
-	int len;
-
-	/* copy user */
-	/* BB what about null user mounts - check that we do this BB */
-	/* copy user */
-	if (ses->user_name != NULL) {
-		len = strscpy(bcc_ptr, ses->user_name, CIFS_MAX_USERNAME_LEN);
-		if (WARN_ON_ONCE(len < 0))
-			len = CIFS_MAX_USERNAME_LEN - 1;
-		bcc_ptr += len;
-	}
-	/* else null user mount */
-	*bcc_ptr = 0;
-	bcc_ptr++; /* account for null termination */
-
-	/* copy domain */
-	if (ses->domainName != NULL) {
-		len = strscpy(bcc_ptr, ses->domainName, CIFS_MAX_DOMAINNAME_LEN);
-		if (WARN_ON_ONCE(len < 0))
-			len = CIFS_MAX_DOMAINNAME_LEN - 1;
-		bcc_ptr += len;
-	} /* else we will send a null domain name
-	     so the server will default to its own domain */
-	*bcc_ptr = 0;
-	bcc_ptr++;
-
-	/* BB check for overflow here */
-
-	strcpy(bcc_ptr, "Linux version ");
-	bcc_ptr += strlen("Linux version ");
-	strcpy(bcc_ptr, init_utsname()->release);
-	bcc_ptr += strlen(init_utsname()->release) + 1;
-
-	strcpy(bcc_ptr, CIFS_NETWORK_OPSYS);
-	bcc_ptr += strlen(CIFS_NETWORK_OPSYS) + 1;
-
-	*pbcc_area = bcc_ptr;
-}
-
-static void
-decode_unicode_ssetup(char **pbcc_area, int bleft, struct cifs_ses *ses,
-		      const struct nls_table *nls_cp)
-{
-	int len;
-	char *data = *pbcc_area;
-
-	cifs_dbg(FYI, "bleft %d\n", bleft);
-
-	kfree(ses->serverOS);
-	ses->serverOS = cifs_strndup_from_utf16(data, bleft, true, nls_cp);
-	cifs_dbg(FYI, "serverOS=%s\n", ses->serverOS);
-	len = (UniStrnlen((wchar_t *) data, bleft / 2) * 2) + 2;
-	data += len;
-	bleft -= len;
-	if (bleft <= 0)
-		return;
-
-	kfree(ses->serverNOS);
-	ses->serverNOS = cifs_strndup_from_utf16(data, bleft, true, nls_cp);
-	cifs_dbg(FYI, "serverNOS=%s\n", ses->serverNOS);
-	len = (UniStrnlen((wchar_t *) data, bleft / 2) * 2) + 2;
-	data += len;
-	bleft -= len;
-	if (bleft <= 0)
-		return;
-
-	kfree(ses->serverDomain);
-	ses->serverDomain = cifs_strndup_from_utf16(data, bleft, true, nls_cp);
-	cifs_dbg(FYI, "serverDomain=%s\n", ses->serverDomain);
-
-	return;
-}
-
-static void decode_ascii_ssetup(char **pbcc_area, __u16 bleft,
-				struct cifs_ses *ses,
-				const struct nls_table *nls_cp)
-{
-	int len;
-	char *bcc_ptr = *pbcc_area;
-
-	cifs_dbg(FYI, "decode sessetup ascii. bleft %d\n", bleft);
-
-	len = strnlen(bcc_ptr, bleft);
-	if (len >= bleft)
-		return;
-
-	kfree(ses->serverOS);
-
-	ses->serverOS = kmalloc(len + 1, GFP_KERNEL);
-	if (ses->serverOS) {
-		memcpy(ses->serverOS, bcc_ptr, len);
-		ses->serverOS[len] = 0;
-		if (strncmp(ses->serverOS, "OS/2", 4) == 0)
-			cifs_dbg(FYI, "OS/2 server\n");
-	}
-
-	bcc_ptr += len + 1;
-	bleft -= len + 1;
-
-	len = strnlen(bcc_ptr, bleft);
-	if (len >= bleft)
-		return;
-
-	kfree(ses->serverNOS);
-
-	ses->serverNOS = kmalloc(len + 1, GFP_KERNEL);
-	if (ses->serverNOS) {
-		memcpy(ses->serverNOS, bcc_ptr, len);
-		ses->serverNOS[len] = 0;
-	}
-
-	bcc_ptr += len + 1;
-	bleft -= len + 1;
-
-	len = strnlen(bcc_ptr, bleft);
-	if (len > bleft)
-		return;
-
-	/* No domain field in LANMAN case. Domain is
-	   returned by old servers in the SMB negprot response */
-	/* BB For newer servers which do not support Unicode,
-	   but thus do return domain here we could add parsing
-	   for it later, but it is not very important */
-	cifs_dbg(FYI, "ascii: bytes left %d\n", bleft);
-}
-#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
-
-int decode_ntlmssp_challenge(char *bcc_ptr, int blob_len,
-				    struct cifs_ses *ses)
-{
-	unsigned int tioffset; /* challenge message target info area */
-	unsigned int tilen; /* challenge message target info area length  */
-	CHALLENGE_MESSAGE *pblob = (CHALLENGE_MESSAGE *)bcc_ptr;
-	__u32 server_flags;
-
-	if (blob_len < sizeof(CHALLENGE_MESSAGE)) {
-		cifs_dbg(VFS, "challenge blob len %d too small\n", blob_len);
-		return -EINVAL;
-	}
-
-	if (memcmp(pblob->Signature, "NTLMSSP", 8)) {
-		cifs_dbg(VFS, "blob signature incorrect %s\n",
-			 pblob->Signature);
-		return -EINVAL;
-	}
-	if (pblob->MessageType != NtLmChallenge) {
-		cifs_dbg(VFS, "Incorrect message type %d\n",
-			 pblob->MessageType);
-		return -EINVAL;
-	}
-
-	server_flags = le32_to_cpu(pblob->NegotiateFlags);
-	cifs_dbg(FYI, "%s: negotiate=0x%08x challenge=0x%08x\n", __func__,
-		 ses->ntlmssp->client_flags, server_flags);
-
-	if ((ses->ntlmssp->client_flags & (NTLMSSP_NEGOTIATE_SEAL | NTLMSSP_NEGOTIATE_SIGN)) &&
-	    (!(server_flags & NTLMSSP_NEGOTIATE_56) && !(server_flags & NTLMSSP_NEGOTIATE_128))) {
-		cifs_dbg(VFS, "%s: requested signing/encryption but server did not return either 56-bit or 128-bit session key size\n",
-			 __func__);
-		return -EINVAL;
-	}
-	if (!(server_flags & NTLMSSP_NEGOTIATE_NTLM) && !(server_flags & NTLMSSP_NEGOTIATE_EXTENDED_SEC)) {
-		cifs_dbg(VFS, "%s: server does not seem to support either NTLMv1 or NTLMv2\n", __func__);
-		return -EINVAL;
-	}
-	if (ses->server->sign && !(server_flags & NTLMSSP_NEGOTIATE_SIGN)) {
-		cifs_dbg(VFS, "%s: forced packet signing but server does not seem to support it\n",
-			 __func__);
-		return -EOPNOTSUPP;
-	}
-	if ((ses->ntlmssp->client_flags & NTLMSSP_NEGOTIATE_KEY_XCH) &&
-	    !(server_flags & NTLMSSP_NEGOTIATE_KEY_XCH))
-		pr_warn_once("%s: authentication has been weakened as server does not support key exchange\n",
-			     __func__);
-
-	ses->ntlmssp->server_flags = server_flags;
-
-	memcpy(ses->ntlmssp->cryptkey, pblob->Challenge, CIFS_CRYPTO_KEY_SIZE);
-	/* In particular we can examine sign flags */
-	/* BB spec says that if AvId field of MsvAvTimestamp is populated then
-		we must set the MIC field of the AUTHENTICATE_MESSAGE */
-
-	tioffset = le32_to_cpu(pblob->TargetInfoArray.BufferOffset);
-	tilen = le16_to_cpu(pblob->TargetInfoArray.Length);
-	if (tioffset > blob_len || tioffset + tilen > blob_len) {
-		cifs_dbg(VFS, "tioffset + tilen too high %u + %u\n",
-			 tioffset, tilen);
-		return -EINVAL;
-	}
-	if (tilen) {
-		kfree_sensitive(ses->auth_key.response);
-		ses->auth_key.response = kmemdup(bcc_ptr + tioffset, tilen,
-						 GFP_KERNEL);
-		if (!ses->auth_key.response) {
-			cifs_dbg(VFS, "Challenge target info alloc failure\n");
-			return -ENOMEM;
-		}
-		ses->auth_key.len = tilen;
-	}
-
-	return 0;
-}
-
-static int size_of_ntlmssp_blob(struct cifs_ses *ses, int base_size)
-{
-	int sz = base_size + ses->auth_key.len
-		- CIFS_SESS_KEY_SIZE + CIFS_CPHTXT_SIZE + 2;
-
-	if (ses->domainName)
-		sz += sizeof(__le16) * strnlen(ses->domainName, CIFS_MAX_DOMAINNAME_LEN);
-	else
-		sz += sizeof(__le16);
-
-	if (ses->user_name)
-		sz += sizeof(__le16) * strnlen(ses->user_name, CIFS_MAX_USERNAME_LEN);
-	else
-		sz += sizeof(__le16);
-
-	if (ses->workstation_name[0])
-		sz += sizeof(__le16) * strnlen(ses->workstation_name,
-					       ntlmssp_workstation_name_size(ses));
-	else
-		sz += sizeof(__le16);
-
-	return sz;
-}
-
-static inline void cifs_security_buffer_from_str(SECURITY_BUFFER *pbuf,
-						 char *str_value,
-						 int str_length,
-						 unsigned char *pstart,
-						 unsigned char **pcur,
-						 const struct nls_table *nls_cp)
-{
-	unsigned char *tmp = pstart;
-	int len;
-
-	if (!pbuf)
-		return;
-
-	if (!pcur)
-		pcur = &tmp;
-
-	if (!str_value) {
-		pbuf->BufferOffset = cpu_to_le32(*pcur - pstart);
-		pbuf->Length = 0;
-		pbuf->MaximumLength = 0;
-		*pcur += sizeof(__le16);
-	} else {
-		len = cifs_strtoUTF16((__le16 *)*pcur,
-				      str_value,
-				      str_length,
-				      nls_cp);
-		len *= sizeof(__le16);
-		pbuf->BufferOffset = cpu_to_le32(*pcur - pstart);
-		pbuf->Length = cpu_to_le16(len);
-		pbuf->MaximumLength = cpu_to_le16(len);
-		*pcur += len;
-	}
-}
-
-/* BB Move to ntlmssp.c eventually */
-
-int build_ntlmssp_negotiate_blob(unsigned char **pbuffer,
-				 u16 *buflen,
-				 struct cifs_ses *ses,
-				 struct TCP_Server_Info *server,
-				 const struct nls_table *nls_cp)
-{
-	int rc = 0;
-	NEGOTIATE_MESSAGE *sec_blob;
-	__u32 flags;
-	unsigned char *tmp;
-	int len;
-
-	len = size_of_ntlmssp_blob(ses, sizeof(NEGOTIATE_MESSAGE));
-	*pbuffer = kmalloc(len, GFP_KERNEL);
-	if (!*pbuffer) {
-		rc = -ENOMEM;
-		cifs_dbg(VFS, "Error %d during NTLMSSP allocation\n", rc);
-		*buflen = 0;
-		goto setup_ntlm_neg_ret;
-	}
-	sec_blob = (NEGOTIATE_MESSAGE *)*pbuffer;
-
-	memset(*pbuffer, 0, sizeof(NEGOTIATE_MESSAGE));
-	memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8);
-	sec_blob->MessageType = NtLmNegotiate;
-
-	/* BB is NTLMV2 session security format easier to use here? */
-	flags = NTLMSSP_NEGOTIATE_56 |	NTLMSSP_REQUEST_TARGET |
-		NTLMSSP_NEGOTIATE_128 | NTLMSSP_NEGOTIATE_UNICODE |
-		NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_EXTENDED_SEC |
-		NTLMSSP_NEGOTIATE_ALWAYS_SIGN | NTLMSSP_NEGOTIATE_SEAL |
-		NTLMSSP_NEGOTIATE_SIGN;
-	if (!server->session_estab || ses->ntlmssp->sesskey_per_smbsess)
-		flags |= NTLMSSP_NEGOTIATE_KEY_XCH;
-
-	tmp = *pbuffer + sizeof(NEGOTIATE_MESSAGE);
-	ses->ntlmssp->client_flags = flags;
-	sec_blob->NegotiateFlags = cpu_to_le32(flags);
-
-	/* these fields should be null in negotiate phase MS-NLMP 3.1.5.1.1 */
-	cifs_security_buffer_from_str(&sec_blob->DomainName,
-				      NULL,
-				      CIFS_MAX_DOMAINNAME_LEN,
-				      *pbuffer, &tmp,
-				      nls_cp);
-
-	cifs_security_buffer_from_str(&sec_blob->WorkstationName,
-				      NULL,
-				      CIFS_MAX_WORKSTATION_LEN,
-				      *pbuffer, &tmp,
-				      nls_cp);
-
-	*buflen = tmp - *pbuffer;
-setup_ntlm_neg_ret:
-	return rc;
-}
-
-/*
- * Build ntlmssp blob with additional fields, such as version,
- * supported by modern servers. For safety limit to SMB3 or later
- * See notes in MS-NLMP Section 2.2.2.1 e.g.
- */
-int build_ntlmssp_smb3_negotiate_blob(unsigned char **pbuffer,
-				 u16 *buflen,
-				 struct cifs_ses *ses,
-				 struct TCP_Server_Info *server,
-				 const struct nls_table *nls_cp)
-{
-	int rc = 0;
-	struct negotiate_message *sec_blob;
-	__u32 flags;
-	unsigned char *tmp;
-	int len;
-
-	len = size_of_ntlmssp_blob(ses, sizeof(struct negotiate_message));
-	*pbuffer = kmalloc(len, GFP_KERNEL);
-	if (!*pbuffer) {
-		rc = -ENOMEM;
-		cifs_dbg(VFS, "Error %d during NTLMSSP allocation\n", rc);
-		*buflen = 0;
-		goto setup_ntlm_smb3_neg_ret;
-	}
-	sec_blob = (struct negotiate_message *)*pbuffer;
-
-	memset(*pbuffer, 0, sizeof(struct negotiate_message));
-	memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8);
-	sec_blob->MessageType = NtLmNegotiate;
-
-	/* BB is NTLMV2 session security format easier to use here? */
-	flags = NTLMSSP_NEGOTIATE_56 |	NTLMSSP_REQUEST_TARGET |
-		NTLMSSP_NEGOTIATE_128 | NTLMSSP_NEGOTIATE_UNICODE |
-		NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_EXTENDED_SEC |
-		NTLMSSP_NEGOTIATE_ALWAYS_SIGN | NTLMSSP_NEGOTIATE_SEAL |
-		NTLMSSP_NEGOTIATE_SIGN | NTLMSSP_NEGOTIATE_VERSION;
-	if (!server->session_estab || ses->ntlmssp->sesskey_per_smbsess)
-		flags |= NTLMSSP_NEGOTIATE_KEY_XCH;
-
-	sec_blob->Version.ProductMajorVersion = LINUX_VERSION_MAJOR;
-	sec_blob->Version.ProductMinorVersion = LINUX_VERSION_PATCHLEVEL;
-	sec_blob->Version.ProductBuild = cpu_to_le16(SMB3_PRODUCT_BUILD);
-	sec_blob->Version.NTLMRevisionCurrent = NTLMSSP_REVISION_W2K3;
-
-	tmp = *pbuffer + sizeof(struct negotiate_message);
-	ses->ntlmssp->client_flags = flags;
-	sec_blob->NegotiateFlags = cpu_to_le32(flags);
-
-	/* these fields should be null in negotiate phase MS-NLMP 3.1.5.1.1 */
-	cifs_security_buffer_from_str(&sec_blob->DomainName,
-				      NULL,
-				      CIFS_MAX_DOMAINNAME_LEN,
-				      *pbuffer, &tmp,
-				      nls_cp);
-
-	cifs_security_buffer_from_str(&sec_blob->WorkstationName,
-				      NULL,
-				      CIFS_MAX_WORKSTATION_LEN,
-				      *pbuffer, &tmp,
-				      nls_cp);
-
-	*buflen = tmp - *pbuffer;
-setup_ntlm_smb3_neg_ret:
-	return rc;
-}
-
-
-int build_ntlmssp_auth_blob(unsigned char **pbuffer,
-					u16 *buflen,
-				   struct cifs_ses *ses,
-				   struct TCP_Server_Info *server,
-				   const struct nls_table *nls_cp)
-{
-	int rc;
-	AUTHENTICATE_MESSAGE *sec_blob;
-	__u32 flags;
-	unsigned char *tmp;
-	int len;
-
-	rc = setup_ntlmv2_rsp(ses, nls_cp);
-	if (rc) {
-		cifs_dbg(VFS, "Error %d during NTLMSSP authentication\n", rc);
-		*buflen = 0;
-		goto setup_ntlmv2_ret;
-	}
-
-	len = size_of_ntlmssp_blob(ses, sizeof(AUTHENTICATE_MESSAGE));
-	*pbuffer = kmalloc(len, GFP_KERNEL);
-	if (!*pbuffer) {
-		rc = -ENOMEM;
-		cifs_dbg(VFS, "Error %d during NTLMSSP allocation\n", rc);
-		*buflen = 0;
-		goto setup_ntlmv2_ret;
-	}
-	sec_blob = (AUTHENTICATE_MESSAGE *)*pbuffer;
-
-	memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8);
-	sec_blob->MessageType = NtLmAuthenticate;
-
-	flags = ses->ntlmssp->server_flags | NTLMSSP_REQUEST_TARGET |
-		NTLMSSP_NEGOTIATE_TARGET_INFO | NTLMSSP_NEGOTIATE_WORKSTATION_SUPPLIED;
-
-	tmp = *pbuffer + sizeof(AUTHENTICATE_MESSAGE);
-	sec_blob->NegotiateFlags = cpu_to_le32(flags);
-
-	sec_blob->LmChallengeResponse.BufferOffset =
-				cpu_to_le32(sizeof(AUTHENTICATE_MESSAGE));
-	sec_blob->LmChallengeResponse.Length = 0;
-	sec_blob->LmChallengeResponse.MaximumLength = 0;
-
-	sec_blob->NtChallengeResponse.BufferOffset =
-				cpu_to_le32(tmp - *pbuffer);
-	if (ses->user_name != NULL) {
-		memcpy(tmp, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
-				ses->auth_key.len - CIFS_SESS_KEY_SIZE);
-		tmp += ses->auth_key.len - CIFS_SESS_KEY_SIZE;
-
-		sec_blob->NtChallengeResponse.Length =
-				cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
-		sec_blob->NtChallengeResponse.MaximumLength =
-				cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
-	} else {
-		/*
-		 * don't send an NT Response for anonymous access
-		 */
-		sec_blob->NtChallengeResponse.Length = 0;
-		sec_blob->NtChallengeResponse.MaximumLength = 0;
-	}
-
-	cifs_security_buffer_from_str(&sec_blob->DomainName,
-				      ses->domainName,
-				      CIFS_MAX_DOMAINNAME_LEN,
-				      *pbuffer, &tmp,
-				      nls_cp);
-
-	cifs_security_buffer_from_str(&sec_blob->UserName,
-				      ses->user_name,
-				      CIFS_MAX_USERNAME_LEN,
-				      *pbuffer, &tmp,
-				      nls_cp);
-
-	cifs_security_buffer_from_str(&sec_blob->WorkstationName,
-				      ses->workstation_name,
-				      ntlmssp_workstation_name_size(ses),
-				      *pbuffer, &tmp,
-				      nls_cp);
-
-	if ((ses->ntlmssp->server_flags & NTLMSSP_NEGOTIATE_KEY_XCH) &&
-	    (!ses->server->session_estab || ses->ntlmssp->sesskey_per_smbsess) &&
-	    !calc_seckey(ses)) {
-		memcpy(tmp, ses->ntlmssp->ciphertext, CIFS_CPHTXT_SIZE);
-		sec_blob->SessionKey.BufferOffset = cpu_to_le32(tmp - *pbuffer);
-		sec_blob->SessionKey.Length = cpu_to_le16(CIFS_CPHTXT_SIZE);
-		sec_blob->SessionKey.MaximumLength =
-				cpu_to_le16(CIFS_CPHTXT_SIZE);
-		tmp += CIFS_CPHTXT_SIZE;
-	} else {
-		sec_blob->SessionKey.BufferOffset = cpu_to_le32(tmp - *pbuffer);
-		sec_blob->SessionKey.Length = 0;
-		sec_blob->SessionKey.MaximumLength = 0;
-	}
-
-	*buflen = tmp - *pbuffer;
-setup_ntlmv2_ret:
-	return rc;
-}
-
-enum securityEnum
-cifs_select_sectype(struct TCP_Server_Info *server, enum securityEnum requested)
-{
-	switch (server->negflavor) {
-	case CIFS_NEGFLAVOR_EXTENDED:
-		switch (requested) {
-		case Kerberos:
-		case RawNTLMSSP:
-			return requested;
-		case Unspecified:
-			if (server->sec_ntlmssp &&
-			    (global_secflags & CIFSSEC_MAY_NTLMSSP))
-				return RawNTLMSSP;
-			if ((server->sec_kerberos || server->sec_mskerberos) &&
-			    (global_secflags & CIFSSEC_MAY_KRB5))
-				return Kerberos;
-			fallthrough;
-		default:
-			return Unspecified;
-		}
-	case CIFS_NEGFLAVOR_UNENCAP:
-		switch (requested) {
-		case NTLMv2:
-			return requested;
-		case Unspecified:
-			if (global_secflags & CIFSSEC_MAY_NTLMV2)
-				return NTLMv2;
-			break;
-		default:
-			break;
-		}
-		fallthrough;
-	default:
-		return Unspecified;
-	}
-}
-
-struct sess_data {
-	unsigned int xid;
-	struct cifs_ses *ses;
-	struct TCP_Server_Info *server;
-	struct nls_table *nls_cp;
-	void (*func)(struct sess_data *);
-	int result;
-
-	/* we will send the SMB in three pieces:
-	 * a fixed length beginning part, an optional
-	 * SPNEGO blob (which can be zero length), and a
-	 * last part which will include the strings
-	 * and rest of bcc area. This allows us to avoid
-	 * a large buffer 17K allocation
-	 */
-	int buf0_type;
-	struct kvec iov[3];
-};
-
-#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
-static int
-sess_alloc_buffer(struct sess_data *sess_data, int wct)
-{
-	int rc;
-	struct cifs_ses *ses = sess_data->ses;
-	struct smb_hdr *smb_buf;
-
-	rc = small_smb_init_no_tc(SMB_COM_SESSION_SETUP_ANDX, wct, ses,
-				  (void **)&smb_buf);
-
-	if (rc)
-		return rc;
-
-	sess_data->iov[0].iov_base = (char *)smb_buf;
-	sess_data->iov[0].iov_len = be32_to_cpu(smb_buf->smb_buf_length) + 4;
-	/*
-	 * This variable will be used to clear the buffer
-	 * allocated above in case of any error in the calling function.
-	 */
-	sess_data->buf0_type = CIFS_SMALL_BUFFER;
-
-	/* 2000 big enough to fit max user, domain, NOS name etc. */
-	sess_data->iov[2].iov_base = kmalloc(2000, GFP_KERNEL);
-	if (!sess_data->iov[2].iov_base) {
-		rc = -ENOMEM;
-		goto out_free_smb_buf;
-	}
-
-	return 0;
-
-out_free_smb_buf:
-	cifs_small_buf_release(smb_buf);
-	sess_data->iov[0].iov_base = NULL;
-	sess_data->iov[0].iov_len = 0;
-	sess_data->buf0_type = CIFS_NO_BUFFER;
-	return rc;
-}
-
-static void
-sess_free_buffer(struct sess_data *sess_data)
-{
-	struct kvec *iov = sess_data->iov;
-
-	/*
-	 * Zero the session data before freeing, as it might contain sensitive info (keys, etc).
-	 * Note that iov[1] is already freed by caller.
-	 */
-	if (sess_data->buf0_type != CIFS_NO_BUFFER && iov[0].iov_base)
-		memzero_explicit(iov[0].iov_base, iov[0].iov_len);
-
-	free_rsp_buf(sess_data->buf0_type, iov[0].iov_base);
-	sess_data->buf0_type = CIFS_NO_BUFFER;
-	kfree_sensitive(iov[2].iov_base);
-}
-
-static int
-sess_establish_session(struct sess_data *sess_data)
-{
-	struct cifs_ses *ses = sess_data->ses;
-	struct TCP_Server_Info *server = sess_data->server;
-
-	cifs_server_lock(server);
-	if (!server->session_estab) {
-		if (server->sign) {
-			server->session_key.response =
-				kmemdup(ses->auth_key.response,
-				ses->auth_key.len, GFP_KERNEL);
-			if (!server->session_key.response) {
-				cifs_server_unlock(server);
-				return -ENOMEM;
-			}
-			server->session_key.len =
-						ses->auth_key.len;
-		}
-		server->sequence_number = 0x2;
-		server->session_estab = true;
-	}
-	cifs_server_unlock(server);
-
-	cifs_dbg(FYI, "CIFS session established successfully\n");
-	return 0;
-}
-
-static int
-sess_sendreceive(struct sess_data *sess_data)
-{
-	int rc;
-	struct smb_hdr *smb_buf = (struct smb_hdr *) sess_data->iov[0].iov_base;
-	__u16 count;
-	struct kvec rsp_iov = { NULL, 0 };
-
-	count = sess_data->iov[1].iov_len + sess_data->iov[2].iov_len;
-	be32_add_cpu(&smb_buf->smb_buf_length, count);
-	put_bcc(count, smb_buf);
-
-	rc = SendReceive2(sess_data->xid, sess_data->ses,
-			  sess_data->iov, 3 /* num_iovecs */,
-			  &sess_data->buf0_type,
-			  CIFS_LOG_ERROR, &rsp_iov);
-	cifs_small_buf_release(sess_data->iov[0].iov_base);
-	memcpy(&sess_data->iov[0], &rsp_iov, sizeof(struct kvec));
-
-	return rc;
-}
-
-static void
-sess_auth_ntlmv2(struct sess_data *sess_data)
-{
-	int rc = 0;
-	struct smb_hdr *smb_buf;
-	SESSION_SETUP_ANDX *pSMB;
-	char *bcc_ptr;
-	struct cifs_ses *ses = sess_data->ses;
-	struct TCP_Server_Info *server = sess_data->server;
-	__u32 capabilities;
-	__u16 bytes_remaining;
-
-	/* old style NTLM sessionsetup */
-	/* wct = 13 */
-	rc = sess_alloc_buffer(sess_data, 13);
-	if (rc)
-		goto out;
-
-	pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
-	bcc_ptr = sess_data->iov[2].iov_base;
-	capabilities = cifs_ssetup_hdr(ses, server, pSMB);
-
-	pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities);
-
-	/* LM2 password would be here if we supported it */
-	pSMB->req_no_secext.CaseInsensitivePasswordLength = 0;
-
-	if (ses->user_name != NULL) {
-		/* calculate nlmv2 response and session key */
-		rc = setup_ntlmv2_rsp(ses, sess_data->nls_cp);
-		if (rc) {
-			cifs_dbg(VFS, "Error %d during NTLMv2 authentication\n", rc);
-			goto out;
-		}
-
-		memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
-				ses->auth_key.len - CIFS_SESS_KEY_SIZE);
-		bcc_ptr += ses->auth_key.len - CIFS_SESS_KEY_SIZE;
-
-		/* set case sensitive password length after tilen may get
-		 * assigned, tilen is 0 otherwise.
-		 */
-		pSMB->req_no_secext.CaseSensitivePasswordLength =
-			cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
-	} else {
-		pSMB->req_no_secext.CaseSensitivePasswordLength = 0;
-	}
-
-	if (ses->capabilities & CAP_UNICODE) {
-		if (!IS_ALIGNED(sess_data->iov[0].iov_len, 2)) {
-			*bcc_ptr = 0;
-			bcc_ptr++;
-		}
-		unicode_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
-	} else {
-		ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
-	}
-
-
-	sess_data->iov[2].iov_len = (long) bcc_ptr -
-			(long) sess_data->iov[2].iov_base;
-
-	rc = sess_sendreceive(sess_data);
-	if (rc)
-		goto out;
-
-	pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
-	smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
-
-	if (smb_buf->WordCount != 3) {
-		rc = -EIO;
-		cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
-		goto out;
-	}
-
-	if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
-		cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
-
-	ses->Suid = smb_buf->Uid;   /* UID left in wire format (le) */
-	cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
-
-	bytes_remaining = get_bcc(smb_buf);
-	bcc_ptr = pByteArea(smb_buf);
-
-	/* BB check if Unicode and decode strings */
-	if (bytes_remaining == 0) {
-		/* no string area to decode, do nothing */
-	} else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
-		/* unicode string area must be word-aligned */
-		if (!IS_ALIGNED((unsigned long)bcc_ptr - (unsigned long)smb_buf, 2)) {
-			++bcc_ptr;
-			--bytes_remaining;
-		}
-		decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
-				      sess_data->nls_cp);
-	} else {
-		decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
-				    sess_data->nls_cp);
-	}
-
-	rc = sess_establish_session(sess_data);
-out:
-	sess_data->result = rc;
-	sess_data->func = NULL;
-	sess_free_buffer(sess_data);
-	kfree_sensitive(ses->auth_key.response);
-	ses->auth_key.response = NULL;
-}
-
-#ifdef CONFIG_CIFS_UPCALL
-static void
-sess_auth_kerberos(struct sess_data *sess_data)
-{
-	int rc = 0;
-	struct smb_hdr *smb_buf;
-	SESSION_SETUP_ANDX *pSMB;
-	char *bcc_ptr;
-	struct cifs_ses *ses = sess_data->ses;
-	struct TCP_Server_Info *server = sess_data->server;
-	__u32 capabilities;
-	__u16 bytes_remaining;
-	struct key *spnego_key = NULL;
-	struct cifs_spnego_msg *msg;
-	u16 blob_len;
-
-	/* extended security */
-	/* wct = 12 */
-	rc = sess_alloc_buffer(sess_data, 12);
-	if (rc)
-		goto out;
-
-	pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
-	bcc_ptr = sess_data->iov[2].iov_base;
-	capabilities = cifs_ssetup_hdr(ses, server, pSMB);
-
-	spnego_key = cifs_get_spnego_key(ses, server);
-	if (IS_ERR(spnego_key)) {
-		rc = PTR_ERR(spnego_key);
-		spnego_key = NULL;
-		goto out;
-	}
-
-	msg = spnego_key->payload.data[0];
-	/*
-	 * check version field to make sure that cifs.upcall is
-	 * sending us a response in an expected form
-	 */
-	if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
-		cifs_dbg(VFS, "incorrect version of cifs.upcall (expected %d but got %d)\n",
-			 CIFS_SPNEGO_UPCALL_VERSION, msg->version);
-		rc = -EKEYREJECTED;
-		goto out_put_spnego_key;
-	}
-
-	kfree_sensitive(ses->auth_key.response);
-	ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
-					 GFP_KERNEL);
-	if (!ses->auth_key.response) {
-		cifs_dbg(VFS, "Kerberos can't allocate (%u bytes) memory\n",
-			 msg->sesskey_len);
-		rc = -ENOMEM;
-		goto out_put_spnego_key;
-	}
-	ses->auth_key.len = msg->sesskey_len;
-
-	pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC;
-	capabilities |= CAP_EXTENDED_SECURITY;
-	pSMB->req.Capabilities = cpu_to_le32(capabilities);
-	sess_data->iov[1].iov_base = msg->data + msg->sesskey_len;
-	sess_data->iov[1].iov_len = msg->secblob_len;
-	pSMB->req.SecurityBlobLength = cpu_to_le16(sess_data->iov[1].iov_len);
-
-	if (ses->capabilities & CAP_UNICODE) {
-		/* unicode strings must be word aligned */
-		if (!IS_ALIGNED(sess_data->iov[0].iov_len + sess_data->iov[1].iov_len, 2)) {
-			*bcc_ptr = 0;
-			bcc_ptr++;
-		}
-		unicode_oslm_strings(&bcc_ptr, sess_data->nls_cp);
-		unicode_domain_string(&bcc_ptr, ses, sess_data->nls_cp);
-	} else {
-		/* BB: is this right? */
-		ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
-	}
-
-	sess_data->iov[2].iov_len = (long) bcc_ptr -
-			(long) sess_data->iov[2].iov_base;
-
-	rc = sess_sendreceive(sess_data);
-	if (rc)
-		goto out_put_spnego_key;
-
-	pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
-	smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
-
-	if (smb_buf->WordCount != 4) {
-		rc = -EIO;
-		cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
-		goto out_put_spnego_key;
-	}
-
-	if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
-		cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
-
-	ses->Suid = smb_buf->Uid;   /* UID left in wire format (le) */
-	cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
-
-	bytes_remaining = get_bcc(smb_buf);
-	bcc_ptr = pByteArea(smb_buf);
-
-	blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
-	if (blob_len > bytes_remaining) {
-		cifs_dbg(VFS, "bad security blob length %d\n",
-				blob_len);
-		rc = -EINVAL;
-		goto out_put_spnego_key;
-	}
-	bcc_ptr += blob_len;
-	bytes_remaining -= blob_len;
-
-	/* BB check if Unicode and decode strings */
-	if (bytes_remaining == 0) {
-		/* no string area to decode, do nothing */
-	} else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
-		/* unicode string area must be word-aligned */
-		if (!IS_ALIGNED((unsigned long)bcc_ptr - (unsigned long)smb_buf, 2)) {
-			++bcc_ptr;
-			--bytes_remaining;
-		}
-		decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
-				      sess_data->nls_cp);
-	} else {
-		decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
-				    sess_data->nls_cp);
-	}
-
-	rc = sess_establish_session(sess_data);
-out_put_spnego_key:
-	key_invalidate(spnego_key);
-	key_put(spnego_key);
-out:
-	sess_data->result = rc;
-	sess_data->func = NULL;
-	sess_free_buffer(sess_data);
-	kfree_sensitive(ses->auth_key.response);
-	ses->auth_key.response = NULL;
-}
-
-#endif /* ! CONFIG_CIFS_UPCALL */
-
-/*
- * The required kvec buffers have to be allocated before calling this
- * function.
- */
-static int
-_sess_auth_rawntlmssp_assemble_req(struct sess_data *sess_data)
-{
-	SESSION_SETUP_ANDX *pSMB;
-	struct cifs_ses *ses = sess_data->ses;
-	struct TCP_Server_Info *server = sess_data->server;
-	__u32 capabilities;
-	char *bcc_ptr;
-
-	pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
-
-	capabilities = cifs_ssetup_hdr(ses, server, pSMB);
-	if ((pSMB->req.hdr.Flags2 & SMBFLG2_UNICODE) == 0) {
-		cifs_dbg(VFS, "NTLMSSP requires Unicode support\n");
-		return -ENOSYS;
-	}
-
-	pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC;
-	capabilities |= CAP_EXTENDED_SECURITY;
-	pSMB->req.Capabilities |= cpu_to_le32(capabilities);
-
-	bcc_ptr = sess_data->iov[2].iov_base;
-	/* unicode strings must be word aligned */
-	if (!IS_ALIGNED(sess_data->iov[0].iov_len + sess_data->iov[1].iov_len, 2)) {
-		*bcc_ptr = 0;
-		bcc_ptr++;
-	}
-	unicode_oslm_strings(&bcc_ptr, sess_data->nls_cp);
-
-	sess_data->iov[2].iov_len = (long) bcc_ptr -
-					(long) sess_data->iov[2].iov_base;
-
-	return 0;
-}
-
-static void
-sess_auth_rawntlmssp_authenticate(struct sess_data *sess_data);
-
-static void
-sess_auth_rawntlmssp_negotiate(struct sess_data *sess_data)
-{
-	int rc;
-	struct smb_hdr *smb_buf;
-	SESSION_SETUP_ANDX *pSMB;
-	struct cifs_ses *ses = sess_data->ses;
-	struct TCP_Server_Info *server = sess_data->server;
-	__u16 bytes_remaining;
-	char *bcc_ptr;
-	unsigned char *ntlmsspblob = NULL;
-	u16 blob_len;
-
-	cifs_dbg(FYI, "rawntlmssp session setup negotiate phase\n");
-
-	/*
-	 * if memory allocation is successful, caller of this function
-	 * frees it.
-	 */
-	ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
-	if (!ses->ntlmssp) {
-		rc = -ENOMEM;
-		goto out;
-	}
-	ses->ntlmssp->sesskey_per_smbsess = false;
-
-	/* wct = 12 */
-	rc = sess_alloc_buffer(sess_data, 12);
-	if (rc)
-		goto out;
-
-	pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
-
-	/* Build security blob before we assemble the request */
-	rc = build_ntlmssp_negotiate_blob(&ntlmsspblob,
-				     &blob_len, ses, server,
-				     sess_data->nls_cp);
-	if (rc)
-		goto out_free_ntlmsspblob;
-
-	sess_data->iov[1].iov_len = blob_len;
-	sess_data->iov[1].iov_base = ntlmsspblob;
-	pSMB->req.SecurityBlobLength = cpu_to_le16(blob_len);
-
-	rc = _sess_auth_rawntlmssp_assemble_req(sess_data);
-	if (rc)
-		goto out_free_ntlmsspblob;
-
-	rc = sess_sendreceive(sess_data);
-
-	pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
-	smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
-
-	/* If true, rc here is expected and not an error */
-	if (sess_data->buf0_type != CIFS_NO_BUFFER &&
-	    smb_buf->Status.CifsError ==
-			cpu_to_le32(NT_STATUS_MORE_PROCESSING_REQUIRED))
-		rc = 0;
-
-	if (rc)
-		goto out_free_ntlmsspblob;
-
-	cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n");
-
-	if (smb_buf->WordCount != 4) {
-		rc = -EIO;
-		cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
-		goto out_free_ntlmsspblob;
-	}
-
-	ses->Suid = smb_buf->Uid;   /* UID left in wire format (le) */
-	cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
-
-	bytes_remaining = get_bcc(smb_buf);
-	bcc_ptr = pByteArea(smb_buf);
-
-	blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
-	if (blob_len > bytes_remaining) {
-		cifs_dbg(VFS, "bad security blob length %d\n",
-				blob_len);
-		rc = -EINVAL;
-		goto out_free_ntlmsspblob;
-	}
-
-	rc = decode_ntlmssp_challenge(bcc_ptr, blob_len, ses);
-
-out_free_ntlmsspblob:
-	kfree_sensitive(ntlmsspblob);
-out:
-	sess_free_buffer(sess_data);
-
-	if (!rc) {
-		sess_data->func = sess_auth_rawntlmssp_authenticate;
-		return;
-	}
-
-	/* Else error. Cleanup */
-	kfree_sensitive(ses->auth_key.response);
-	ses->auth_key.response = NULL;
-	kfree_sensitive(ses->ntlmssp);
-	ses->ntlmssp = NULL;
-
-	sess_data->func = NULL;
-	sess_data->result = rc;
-}
-
-static void
-sess_auth_rawntlmssp_authenticate(struct sess_data *sess_data)
-{
-	int rc;
-	struct smb_hdr *smb_buf;
-	SESSION_SETUP_ANDX *pSMB;
-	struct cifs_ses *ses = sess_data->ses;
-	struct TCP_Server_Info *server = sess_data->server;
-	__u16 bytes_remaining;
-	char *bcc_ptr;
-	unsigned char *ntlmsspblob = NULL;
-	u16 blob_len;
-
-	cifs_dbg(FYI, "rawntlmssp session setup authenticate phase\n");
-
-	/* wct = 12 */
-	rc = sess_alloc_buffer(sess_data, 12);
-	if (rc)
-		goto out;
-
-	/* Build security blob before we assemble the request */
-	pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
-	smb_buf = (struct smb_hdr *)pSMB;
-	rc = build_ntlmssp_auth_blob(&ntlmsspblob,
-					&blob_len, ses, server,
-					sess_data->nls_cp);
-	if (rc)
-		goto out_free_ntlmsspblob;
-	sess_data->iov[1].iov_len = blob_len;
-	sess_data->iov[1].iov_base = ntlmsspblob;
-	pSMB->req.SecurityBlobLength = cpu_to_le16(blob_len);
-	/*
-	 * Make sure that we tell the server that we are using
-	 * the uid that it just gave us back on the response
-	 * (challenge)
-	 */
-	smb_buf->Uid = ses->Suid;
-
-	rc = _sess_auth_rawntlmssp_assemble_req(sess_data);
-	if (rc)
-		goto out_free_ntlmsspblob;
-
-	rc = sess_sendreceive(sess_data);
-	if (rc)
-		goto out_free_ntlmsspblob;
-
-	pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
-	smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
-	if (smb_buf->WordCount != 4) {
-		rc = -EIO;
-		cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
-		goto out_free_ntlmsspblob;
-	}
-
-	if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
-		cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
-
-	if (ses->Suid != smb_buf->Uid) {
-		ses->Suid = smb_buf->Uid;
-		cifs_dbg(FYI, "UID changed! new UID = %llu\n", ses->Suid);
-	}
-
-	bytes_remaining = get_bcc(smb_buf);
-	bcc_ptr = pByteArea(smb_buf);
-	blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
-	if (blob_len > bytes_remaining) {
-		cifs_dbg(VFS, "bad security blob length %d\n",
-				blob_len);
-		rc = -EINVAL;
-		goto out_free_ntlmsspblob;
-	}
-	bcc_ptr += blob_len;
-	bytes_remaining -= blob_len;
-
-
-	/* BB check if Unicode and decode strings */
-	if (bytes_remaining == 0) {
-		/* no string area to decode, do nothing */
-	} else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
-		/* unicode string area must be word-aligned */
-		if (!IS_ALIGNED((unsigned long)bcc_ptr - (unsigned long)smb_buf, 2)) {
-			++bcc_ptr;
-			--bytes_remaining;
-		}
-		decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
-				      sess_data->nls_cp);
-	} else {
-		decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
-				    sess_data->nls_cp);
-	}
-
-out_free_ntlmsspblob:
-	kfree_sensitive(ntlmsspblob);
-out:
-	sess_free_buffer(sess_data);
-
-	if (!rc)
-		rc = sess_establish_session(sess_data);
-
-	/* Cleanup */
-	kfree_sensitive(ses->auth_key.response);
-	ses->auth_key.response = NULL;
-	kfree_sensitive(ses->ntlmssp);
-	ses->ntlmssp = NULL;
-
-	sess_data->func = NULL;
-	sess_data->result = rc;
-}
-
-static int select_sec(struct sess_data *sess_data)
-{
-	int type;
-	struct cifs_ses *ses = sess_data->ses;
-	struct TCP_Server_Info *server = sess_data->server;
-
-	type = cifs_select_sectype(server, ses->sectype);
-	cifs_dbg(FYI, "sess setup type %d\n", type);
-	if (type == Unspecified) {
-		cifs_dbg(VFS, "Unable to select appropriate authentication method!\n");
-		return -EINVAL;
-	}
-
-	switch (type) {
-	case NTLMv2:
-		sess_data->func = sess_auth_ntlmv2;
-		break;
-	case Kerberos:
-#ifdef CONFIG_CIFS_UPCALL
-		sess_data->func = sess_auth_kerberos;
-		break;
-#else
-		cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n");
-		return -ENOSYS;
-#endif /* CONFIG_CIFS_UPCALL */
-	case RawNTLMSSP:
-		sess_data->func = sess_auth_rawntlmssp_negotiate;
-		break;
-	default:
-		cifs_dbg(VFS, "secType %d not supported!\n", type);
-		return -ENOSYS;
-	}
-
-	return 0;
-}
-
-int CIFS_SessSetup(const unsigned int xid, struct cifs_ses *ses,
-		   struct TCP_Server_Info *server,
-		   const struct nls_table *nls_cp)
-{
-	int rc = 0;
-	struct sess_data *sess_data;
-
-	if (ses == NULL) {
-		WARN(1, "%s: ses == NULL!", __func__);
-		return -EINVAL;
-	}
-
-	sess_data = kzalloc(sizeof(struct sess_data), GFP_KERNEL);
-	if (!sess_data)
-		return -ENOMEM;
-
-	sess_data->xid = xid;
-	sess_data->ses = ses;
-	sess_data->server = server;
-	sess_data->buf0_type = CIFS_NO_BUFFER;
-	sess_data->nls_cp = (struct nls_table *) nls_cp;
-
-	rc = select_sec(sess_data);
-	if (rc)
-		goto out;
-
-	while (sess_data->func)
-		sess_data->func(sess_data);
-
-	/* Store result before we free sess_data */
-	rc = sess_data->result;
-
-out:
-	kfree_sensitive(sess_data);
-	return rc;
-}
-#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */