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

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>

1 files changed, 0 insertions, 934 deletions

diff --git a/fs/cifs/smb2transport.c b/fs/cifs/smb2transport.c
deleted file mode 100644
index 790acf65a092..000000000000
--- a/fs/cifs/smb2transport.c
+++ /dev/null
@@ -1,934 +0,0 @@
-// SPDX-License-Identifier: LGPL-2.1
-/*
- *
- *   Copyright (C) International Business Machines  Corp., 2002, 2011
- *                 Etersoft, 2012
- *   Author(s): Steve French (sfrench@us.ibm.com)
- *              Jeremy Allison (jra@samba.org) 2006
- *              Pavel Shilovsky (pshilovsky@samba.org) 2012
- *
- */
-
-#include <linux/fs.h>
-#include <linux/list.h>
-#include <linux/wait.h>
-#include <linux/net.h>
-#include <linux/delay.h>
-#include <linux/uaccess.h>
-#include <asm/processor.h>
-#include <linux/mempool.h>
-#include <linux/highmem.h>
-#include <crypto/aead.h>
-#include "cifsglob.h"
-#include "cifsproto.h"
-#include "smb2proto.h"
-#include "cifs_debug.h"
-#include "smb2status.h"
-#include "smb2glob.h"
-
-static int
-smb3_crypto_shash_allocate(struct TCP_Server_Info *server)
-{
-	struct cifs_secmech *p = &server->secmech;
-	int rc;
-
-	rc = cifs_alloc_hash("hmac(sha256)", &p->hmacsha256);
-	if (rc)
-		goto err;
-
-	rc = cifs_alloc_hash("cmac(aes)", &p->aes_cmac);
-	if (rc)
-		goto err;
-
-	return 0;
-err:
-	cifs_free_hash(&p->hmacsha256);
-	return rc;
-}
-
-int
-smb311_crypto_shash_allocate(struct TCP_Server_Info *server)
-{
-	struct cifs_secmech *p = &server->secmech;
-	int rc = 0;
-
-	rc = cifs_alloc_hash("hmac(sha256)", &p->hmacsha256);
-	if (rc)
-		return rc;
-
-	rc = cifs_alloc_hash("cmac(aes)", &p->aes_cmac);
-	if (rc)
-		goto err;
-
-	rc = cifs_alloc_hash("sha512", &p->sha512);
-	if (rc)
-		goto err;
-
-	return 0;
-
-err:
-	cifs_free_hash(&p->aes_cmac);
-	cifs_free_hash(&p->hmacsha256);
-	return rc;
-}
-
-
-static
-int smb2_get_sign_key(__u64 ses_id, struct TCP_Server_Info *server, u8 *key)
-{
-	struct cifs_chan *chan;
-	struct TCP_Server_Info *pserver;
-	struct cifs_ses *ses = NULL;
-	int i;
-	int rc = 0;
-	bool is_binding = false;
-
-	spin_lock(&cifs_tcp_ses_lock);
-
-	/* If server is a channel, select the primary channel */
-	pserver = CIFS_SERVER_IS_CHAN(server) ? server->primary_server : server;
-
-	list_for_each_entry(ses, &pserver->smb_ses_list, smb_ses_list) {
-		if (ses->Suid == ses_id)
-			goto found;
-	}
-	cifs_server_dbg(VFS, "%s: Could not find session 0x%llx\n",
-			__func__, ses_id);
-	rc = -ENOENT;
-	goto out;
-
-found:
-	spin_lock(&ses->ses_lock);
-	spin_lock(&ses->chan_lock);
-
-	is_binding = (cifs_chan_needs_reconnect(ses, server) &&
-		      ses->ses_status == SES_GOOD);
-	if (is_binding) {
-		/*
-		 * If we are in the process of binding a new channel
-		 * to an existing session, use the master connection
-		 * session key
-		 */
-		memcpy(key, ses->smb3signingkey, SMB3_SIGN_KEY_SIZE);
-		spin_unlock(&ses->chan_lock);
-		spin_unlock(&ses->ses_lock);
-		goto out;
-	}
-
-	/*
-	 * Otherwise, use the channel key.
-	 */
-
-	for (i = 0; i < ses->chan_count; i++) {
-		chan = ses->chans + i;
-		if (chan->server == server) {
-			memcpy(key, chan->signkey, SMB3_SIGN_KEY_SIZE);
-			spin_unlock(&ses->chan_lock);
-			spin_unlock(&ses->ses_lock);
-			goto out;
-		}
-	}
-	spin_unlock(&ses->chan_lock);
-	spin_unlock(&ses->ses_lock);
-
-	cifs_dbg(VFS,
-		 "%s: Could not find channel signing key for session 0x%llx\n",
-		 __func__, ses_id);
-	rc = -ENOENT;
-
-out:
-	spin_unlock(&cifs_tcp_ses_lock);
-	return rc;
-}
-
-static struct cifs_ses *
-smb2_find_smb_ses_unlocked(struct TCP_Server_Info *server, __u64 ses_id)
-{
-	struct TCP_Server_Info *pserver;
-	struct cifs_ses *ses;
-
-	/* If server is a channel, select the primary channel */
-	pserver = CIFS_SERVER_IS_CHAN(server) ? server->primary_server : server;
-
-	list_for_each_entry(ses, &pserver->smb_ses_list, smb_ses_list) {
-		if (ses->Suid != ses_id)
-			continue;
-		++ses->ses_count;
-		return ses;
-	}
-
-	return NULL;
-}
-
-struct cifs_ses *
-smb2_find_smb_ses(struct TCP_Server_Info *server, __u64 ses_id)
-{
-	struct cifs_ses *ses;
-
-	spin_lock(&cifs_tcp_ses_lock);
-	ses = smb2_find_smb_ses_unlocked(server, ses_id);
-	spin_unlock(&cifs_tcp_ses_lock);
-
-	return ses;
-}
-
-static struct cifs_tcon *
-smb2_find_smb_sess_tcon_unlocked(struct cifs_ses *ses, __u32  tid)
-{
-	struct cifs_tcon *tcon;
-
-	list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
-		if (tcon->tid != tid)
-			continue;
-		++tcon->tc_count;
-		return tcon;
-	}
-
-	return NULL;
-}
-
-/*
- * Obtain tcon corresponding to the tid in the given
- * cifs_ses
- */
-
-struct cifs_tcon *
-smb2_find_smb_tcon(struct TCP_Server_Info *server, __u64 ses_id, __u32  tid)
-{
-	struct cifs_ses *ses;
-	struct cifs_tcon *tcon;
-
-	spin_lock(&cifs_tcp_ses_lock);
-	ses = smb2_find_smb_ses_unlocked(server, ses_id);
-	if (!ses) {
-		spin_unlock(&cifs_tcp_ses_lock);
-		return NULL;
-	}
-	tcon = smb2_find_smb_sess_tcon_unlocked(ses, tid);
-	if (!tcon) {
-		cifs_put_smb_ses(ses);
-		spin_unlock(&cifs_tcp_ses_lock);
-		return NULL;
-	}
-	spin_unlock(&cifs_tcp_ses_lock);
-	/* tcon already has a ref to ses, so we don't need ses anymore */
-	cifs_put_smb_ses(ses);
-
-	return tcon;
-}
-
-int
-smb2_calc_signature(struct smb_rqst *rqst, struct TCP_Server_Info *server,
-			bool allocate_crypto)
-{
-	int rc;
-	unsigned char smb2_signature[SMB2_HMACSHA256_SIZE];
-	unsigned char *sigptr = smb2_signature;
-	struct kvec *iov = rqst->rq_iov;
-	struct smb2_hdr *shdr = (struct smb2_hdr *)iov[0].iov_base;
-	struct cifs_ses *ses;
-	struct shash_desc *shash = NULL;
-	struct smb_rqst drqst;
-
-	ses = smb2_find_smb_ses(server, le64_to_cpu(shdr->SessionId));
-	if (unlikely(!ses)) {
-		cifs_server_dbg(VFS, "%s: Could not find session\n", __func__);
-		return -ENOENT;
-	}
-
-	memset(smb2_signature, 0x0, SMB2_HMACSHA256_SIZE);
-	memset(shdr->Signature, 0x0, SMB2_SIGNATURE_SIZE);
-
-	if (allocate_crypto) {
-		rc = cifs_alloc_hash("hmac(sha256)", &shash);
-		if (rc) {
-			cifs_server_dbg(VFS,
-					"%s: sha256 alloc failed\n", __func__);
-			goto out;
-		}
-	} else {
-		shash = server->secmech.hmacsha256;
-	}
-
-	rc = crypto_shash_setkey(shash->tfm, ses->auth_key.response,
-			SMB2_NTLMV2_SESSKEY_SIZE);
-	if (rc) {
-		cifs_server_dbg(VFS,
-				"%s: Could not update with response\n",
-				__func__);
-		goto out;
-	}
-
-	rc = crypto_shash_init(shash);
-	if (rc) {
-		cifs_server_dbg(VFS, "%s: Could not init sha256", __func__);
-		goto out;
-	}
-
-	/*
-	 * For SMB2+, __cifs_calc_signature() expects to sign only the actual
-	 * data, that is, iov[0] should not contain a rfc1002 length.
-	 *
-	 * Sign the rfc1002 length prior to passing the data (iov[1-N]) down to
-	 * __cifs_calc_signature().
-	 */
-	drqst = *rqst;
-	if (drqst.rq_nvec >= 2 && iov[0].iov_len == 4) {
-		rc = crypto_shash_update(shash, iov[0].iov_base,
-					 iov[0].iov_len);
-		if (rc) {
-			cifs_server_dbg(VFS,
-					"%s: Could not update with payload\n",
-					__func__);
-			goto out;
-		}
-		drqst.rq_iov++;
-		drqst.rq_nvec--;
-	}
-
-	rc = __cifs_calc_signature(&drqst, server, sigptr, shash);
-	if (!rc)
-		memcpy(shdr->Signature, sigptr, SMB2_SIGNATURE_SIZE);
-
-out:
-	if (allocate_crypto)
-		cifs_free_hash(&shash);
-	if (ses)
-		cifs_put_smb_ses(ses);
-	return rc;
-}
-
-static int generate_key(struct cifs_ses *ses, struct kvec label,
-			struct kvec context, __u8 *key, unsigned int key_size)
-{
-	unsigned char zero = 0x0;
-	__u8 i[4] = {0, 0, 0, 1};
-	__u8 L128[4] = {0, 0, 0, 128};
-	__u8 L256[4] = {0, 0, 1, 0};
-	int rc = 0;
-	unsigned char prfhash[SMB2_HMACSHA256_SIZE];
-	unsigned char *hashptr = prfhash;
-	struct TCP_Server_Info *server = ses->server;
-
-	memset(prfhash, 0x0, SMB2_HMACSHA256_SIZE);
-	memset(key, 0x0, key_size);
-
-	rc = smb3_crypto_shash_allocate(server);
-	if (rc) {
-		cifs_server_dbg(VFS, "%s: crypto alloc failed\n", __func__);
-		goto smb3signkey_ret;
-	}
-
-	rc = crypto_shash_setkey(server->secmech.hmacsha256->tfm,
-		ses->auth_key.response, SMB2_NTLMV2_SESSKEY_SIZE);
-	if (rc) {
-		cifs_server_dbg(VFS, "%s: Could not set with session key\n", __func__);
-		goto smb3signkey_ret;
-	}
-
-	rc = crypto_shash_init(server->secmech.hmacsha256);
-	if (rc) {
-		cifs_server_dbg(VFS, "%s: Could not init sign hmac\n", __func__);
-		goto smb3signkey_ret;
-	}
-
-	rc = crypto_shash_update(server->secmech.hmacsha256, i, 4);
-	if (rc) {
-		cifs_server_dbg(VFS, "%s: Could not update with n\n", __func__);
-		goto smb3signkey_ret;
-	}
-
-	rc = crypto_shash_update(server->secmech.hmacsha256, label.iov_base, label.iov_len);
-	if (rc) {
-		cifs_server_dbg(VFS, "%s: Could not update with label\n", __func__);
-		goto smb3signkey_ret;
-	}
-
-	rc = crypto_shash_update(server->secmech.hmacsha256, &zero, 1);
-	if (rc) {
-		cifs_server_dbg(VFS, "%s: Could not update with zero\n", __func__);
-		goto smb3signkey_ret;
-	}
-
-	rc = crypto_shash_update(server->secmech.hmacsha256, context.iov_base, context.iov_len);
-	if (rc) {
-		cifs_server_dbg(VFS, "%s: Could not update with context\n", __func__);
-		goto smb3signkey_ret;
-	}
-
-	if ((server->cipher_type == SMB2_ENCRYPTION_AES256_CCM) ||
-		(server->cipher_type == SMB2_ENCRYPTION_AES256_GCM)) {
-		rc = crypto_shash_update(server->secmech.hmacsha256, L256, 4);
-	} else {
-		rc = crypto_shash_update(server->secmech.hmacsha256, L128, 4);
-	}
-	if (rc) {
-		cifs_server_dbg(VFS, "%s: Could not update with L\n", __func__);
-		goto smb3signkey_ret;
-	}
-
-	rc = crypto_shash_final(server->secmech.hmacsha256, hashptr);
-	if (rc) {
-		cifs_server_dbg(VFS, "%s: Could not generate sha256 hash\n", __func__);
-		goto smb3signkey_ret;
-	}
-
-	memcpy(key, hashptr, key_size);
-
-smb3signkey_ret:
-	return rc;
-}
-
-struct derivation {
-	struct kvec label;
-	struct kvec context;
-};
-
-struct derivation_triplet {
-	struct derivation signing;
-	struct derivation encryption;
-	struct derivation decryption;
-};
-
-static int
-generate_smb3signingkey(struct cifs_ses *ses,
-			struct TCP_Server_Info *server,
-			const struct derivation_triplet *ptriplet)
-{
-	int rc;
-	bool is_binding = false;
-	int chan_index = 0;
-
-	spin_lock(&ses->ses_lock);
-	spin_lock(&ses->chan_lock);
-	is_binding = (cifs_chan_needs_reconnect(ses, server) &&
-		      ses->ses_status == SES_GOOD);
-
-	chan_index = cifs_ses_get_chan_index(ses, server);
-	/* TODO: introduce ref counting for channels when the can be freed */
-	spin_unlock(&ses->chan_lock);
-	spin_unlock(&ses->ses_lock);
-
-	/*
-	 * All channels use the same encryption/decryption keys but
-	 * they have their own signing key.
-	 *
-	 * When we generate the keys, check if it is for a new channel
-	 * (binding) in which case we only need to generate a signing
-	 * key and store it in the channel as to not overwrite the
-	 * master connection signing key stored in the session
-	 */
-
-	if (is_binding) {
-		rc = generate_key(ses, ptriplet->signing.label,
-				  ptriplet->signing.context,
-				  ses->chans[chan_index].signkey,
-				  SMB3_SIGN_KEY_SIZE);
-		if (rc)
-			return rc;
-	} else {
-		rc = generate_key(ses, ptriplet->signing.label,
-				  ptriplet->signing.context,
-				  ses->smb3signingkey,
-				  SMB3_SIGN_KEY_SIZE);
-		if (rc)
-			return rc;
-
-		/* safe to access primary channel, since it will never go away */
-		spin_lock(&ses->chan_lock);
-		memcpy(ses->chans[chan_index].signkey, ses->smb3signingkey,
-		       SMB3_SIGN_KEY_SIZE);
-		spin_unlock(&ses->chan_lock);
-
-		rc = generate_key(ses, ptriplet->encryption.label,
-				  ptriplet->encryption.context,
-				  ses->smb3encryptionkey,
-				  SMB3_ENC_DEC_KEY_SIZE);
-		rc = generate_key(ses, ptriplet->decryption.label,
-				  ptriplet->decryption.context,
-				  ses->smb3decryptionkey,
-				  SMB3_ENC_DEC_KEY_SIZE);
-		if (rc)
-			return rc;
-	}
-
-	if (rc)
-		return rc;
-
-#ifdef CONFIG_CIFS_DEBUG_DUMP_KEYS
-	cifs_dbg(VFS, "%s: dumping generated AES session keys\n", __func__);
-	/*
-	 * The session id is opaque in terms of endianness, so we can't
-	 * print it as a long long. we dump it as we got it on the wire
-	 */
-	cifs_dbg(VFS, "Session Id    %*ph\n", (int)sizeof(ses->Suid),
-			&ses->Suid);
-	cifs_dbg(VFS, "Cipher type   %d\n", server->cipher_type);
-	cifs_dbg(VFS, "Session Key   %*ph\n",
-		 SMB2_NTLMV2_SESSKEY_SIZE, ses->auth_key.response);
-	cifs_dbg(VFS, "Signing Key   %*ph\n",
-		 SMB3_SIGN_KEY_SIZE, ses->smb3signingkey);
-	if ((server->cipher_type == SMB2_ENCRYPTION_AES256_CCM) ||
-		(server->cipher_type == SMB2_ENCRYPTION_AES256_GCM)) {
-		cifs_dbg(VFS, "ServerIn Key  %*ph\n",
-				SMB3_GCM256_CRYPTKEY_SIZE, ses->smb3encryptionkey);
-		cifs_dbg(VFS, "ServerOut Key %*ph\n",
-				SMB3_GCM256_CRYPTKEY_SIZE, ses->smb3decryptionkey);
-	} else {
-		cifs_dbg(VFS, "ServerIn Key  %*ph\n",
-				SMB3_GCM128_CRYPTKEY_SIZE, ses->smb3encryptionkey);
-		cifs_dbg(VFS, "ServerOut Key %*ph\n",
-				SMB3_GCM128_CRYPTKEY_SIZE, ses->smb3decryptionkey);
-	}
-#endif
-	return rc;
-}
-
-int
-generate_smb30signingkey(struct cifs_ses *ses,
-			 struct TCP_Server_Info *server)
-
-{
-	struct derivation_triplet triplet;
-	struct derivation *d;
-
-	d = &triplet.signing;
-	d->label.iov_base = "SMB2AESCMAC";
-	d->label.iov_len = 12;
-	d->context.iov_base = "SmbSign";
-	d->context.iov_len = 8;
-
-	d = &triplet.encryption;
-	d->label.iov_base = "SMB2AESCCM";
-	d->label.iov_len = 11;
-	d->context.iov_base = "ServerIn ";
-	d->context.iov_len = 10;
-
-	d = &triplet.decryption;
-	d->label.iov_base = "SMB2AESCCM";
-	d->label.iov_len = 11;
-	d->context.iov_base = "ServerOut";
-	d->context.iov_len = 10;
-
-	return generate_smb3signingkey(ses, server, &triplet);
-}
-
-int
-generate_smb311signingkey(struct cifs_ses *ses,
-			  struct TCP_Server_Info *server)
-
-{
-	struct derivation_triplet triplet;
-	struct derivation *d;
-
-	d = &triplet.signing;
-	d->label.iov_base = "SMBSigningKey";
-	d->label.iov_len = 14;
-	d->context.iov_base = ses->preauth_sha_hash;
-	d->context.iov_len = 64;
-
-	d = &triplet.encryption;
-	d->label.iov_base = "SMBC2SCipherKey";
-	d->label.iov_len = 16;
-	d->context.iov_base = ses->preauth_sha_hash;
-	d->context.iov_len = 64;
-
-	d = &triplet.decryption;
-	d->label.iov_base = "SMBS2CCipherKey";
-	d->label.iov_len = 16;
-	d->context.iov_base = ses->preauth_sha_hash;
-	d->context.iov_len = 64;
-
-	return generate_smb3signingkey(ses, server, &triplet);
-}
-
-int
-smb3_calc_signature(struct smb_rqst *rqst, struct TCP_Server_Info *server,
-			bool allocate_crypto)
-{
-	int rc;
-	unsigned char smb3_signature[SMB2_CMACAES_SIZE];
-	unsigned char *sigptr = smb3_signature;
-	struct kvec *iov = rqst->rq_iov;
-	struct smb2_hdr *shdr = (struct smb2_hdr *)iov[0].iov_base;
-	struct shash_desc *shash = NULL;
-	struct smb_rqst drqst;
-	u8 key[SMB3_SIGN_KEY_SIZE];
-
-	rc = smb2_get_sign_key(le64_to_cpu(shdr->SessionId), server, key);
-	if (unlikely(rc)) {
-		cifs_server_dbg(VFS, "%s: Could not get signing key\n", __func__);
-		return rc;
-	}
-
-	if (allocate_crypto) {
-		rc = cifs_alloc_hash("cmac(aes)", &shash);
-		if (rc)
-			return rc;
-	} else {
-		shash = server->secmech.aes_cmac;
-	}
-
-	memset(smb3_signature, 0x0, SMB2_CMACAES_SIZE);
-	memset(shdr->Signature, 0x0, SMB2_SIGNATURE_SIZE);
-
-	rc = crypto_shash_setkey(shash->tfm, key, SMB2_CMACAES_SIZE);
-	if (rc) {
-		cifs_server_dbg(VFS, "%s: Could not set key for cmac aes\n", __func__);
-		goto out;
-	}
-
-	/*
-	 * we already allocate aes_cmac when we init smb3 signing key,
-	 * so unlike smb2 case we do not have to check here if secmech are
-	 * initialized
-	 */
-	rc = crypto_shash_init(shash);
-	if (rc) {
-		cifs_server_dbg(VFS, "%s: Could not init cmac aes\n", __func__);
-		goto out;
-	}
-
-	/*
-	 * For SMB2+, __cifs_calc_signature() expects to sign only the actual
-	 * data, that is, iov[0] should not contain a rfc1002 length.
-	 *
-	 * Sign the rfc1002 length prior to passing the data (iov[1-N]) down to
-	 * __cifs_calc_signature().
-	 */
-	drqst = *rqst;
-	if (drqst.rq_nvec >= 2 && iov[0].iov_len == 4) {
-		rc = crypto_shash_update(shash, iov[0].iov_base,
-					 iov[0].iov_len);
-		if (rc) {
-			cifs_server_dbg(VFS, "%s: Could not update with payload\n",
-				 __func__);
-			goto out;
-		}
-		drqst.rq_iov++;
-		drqst.rq_nvec--;
-	}
-
-	rc = __cifs_calc_signature(&drqst, server, sigptr, shash);
-	if (!rc)
-		memcpy(shdr->Signature, sigptr, SMB2_SIGNATURE_SIZE);
-
-out:
-	if (allocate_crypto)
-		cifs_free_hash(&shash);
-	return rc;
-}
-
-/* must be called with server->srv_mutex held */
-static int
-smb2_sign_rqst(struct smb_rqst *rqst, struct TCP_Server_Info *server)
-{
-	int rc = 0;
-	struct smb2_hdr *shdr;
-	struct smb2_sess_setup_req *ssr;
-	bool is_binding;
-	bool is_signed;
-
-	shdr = (struct smb2_hdr *)rqst->rq_iov[0].iov_base;
-	ssr = (struct smb2_sess_setup_req *)shdr;
-
-	is_binding = shdr->Command == SMB2_SESSION_SETUP &&
-		(ssr->Flags & SMB2_SESSION_REQ_FLAG_BINDING);
-	is_signed = shdr->Flags & SMB2_FLAGS_SIGNED;
-
-	if (!is_signed)
-		return 0;
-	spin_lock(&server->srv_lock);
-	if (server->ops->need_neg &&
-	    server->ops->need_neg(server)) {
-		spin_unlock(&server->srv_lock);
-		return 0;
-	}
-	spin_unlock(&server->srv_lock);
-	if (!is_binding && !server->session_estab) {
-		strncpy(shdr->Signature, "BSRSPYL", 8);
-		return 0;
-	}
-
-	rc = server->ops->calc_signature(rqst, server, false);
-
-	return rc;
-}
-
-int
-smb2_verify_signature(struct smb_rqst *rqst, struct TCP_Server_Info *server)
-{
-	unsigned int rc;
-	char server_response_sig[SMB2_SIGNATURE_SIZE];
-	struct smb2_hdr *shdr =
-			(struct smb2_hdr *)rqst->rq_iov[0].iov_base;
-
-	if ((shdr->Command == SMB2_NEGOTIATE) ||
-	    (shdr->Command == SMB2_SESSION_SETUP) ||
-	    (shdr->Command == SMB2_OPLOCK_BREAK) ||
-	    server->ignore_signature ||
-	    (!server->session_estab))
-		return 0;
-
-	/*
-	 * BB what if signatures are supposed to be on for session but
-	 * server does not send one? BB
-	 */
-
-	/* Do not need to verify session setups with signature "BSRSPYL " */
-	if (memcmp(shdr->Signature, "BSRSPYL ", 8) == 0)
-		cifs_dbg(FYI, "dummy signature received for smb command 0x%x\n",
-			 shdr->Command);
-
-	/*
-	 * Save off the origiginal signature so we can modify the smb and check
-	 * our calculated signature against what the server sent.
-	 */
-	memcpy(server_response_sig, shdr->Signature, SMB2_SIGNATURE_SIZE);
-
-	memset(shdr->Signature, 0, SMB2_SIGNATURE_SIZE);
-
-	rc = server->ops->calc_signature(rqst, server, true);
-
-	if (rc)
-		return rc;
-
-	if (memcmp(server_response_sig, shdr->Signature, SMB2_SIGNATURE_SIZE)) {
-		cifs_dbg(VFS, "sign fail cmd 0x%x message id 0x%llx\n",
-			shdr->Command, shdr->MessageId);
-		return -EACCES;
-	} else
-		return 0;
-}
-
-/*
- * Set message id for the request. Should be called after wait_for_free_request
- * and when srv_mutex is held.
- */
-static inline void
-smb2_seq_num_into_buf(struct TCP_Server_Info *server,
-		      struct smb2_hdr *shdr)
-{
-	unsigned int i, num = le16_to_cpu(shdr->CreditCharge);
-
-	shdr->MessageId = get_next_mid64(server);
-	/* skip message numbers according to CreditCharge field */
-	for (i = 1; i < num; i++)
-		get_next_mid(server);
-}
-
-static struct mid_q_entry *
-smb2_mid_entry_alloc(const struct smb2_hdr *shdr,
-		     struct TCP_Server_Info *server)
-{
-	struct mid_q_entry *temp;
-	unsigned int credits = le16_to_cpu(shdr->CreditCharge);
-
-	if (server == NULL) {
-		cifs_dbg(VFS, "Null TCP session in smb2_mid_entry_alloc\n");
-		return NULL;
-	}
-
-	temp = mempool_alloc(cifs_mid_poolp, GFP_NOFS);
-	memset(temp, 0, sizeof(struct mid_q_entry));
-	kref_init(&temp->refcount);
-	temp->mid = le64_to_cpu(shdr->MessageId);
-	temp->credits = credits > 0 ? credits : 1;
-	temp->pid = current->pid;
-	temp->command = shdr->Command; /* Always LE */
-	temp->when_alloc = jiffies;
-	temp->server = server;
-
-	/*
-	 * The default is for the mid to be synchronous, so the
-	 * default callback just wakes up the current task.
-	 */
-	get_task_struct(current);
-	temp->creator = current;
-	temp->callback = cifs_wake_up_task;
-	temp->callback_data = current;
-
-	atomic_inc(&mid_count);
-	temp->mid_state = MID_REQUEST_ALLOCATED;
-	trace_smb3_cmd_enter(le32_to_cpu(shdr->Id.SyncId.TreeId),
-			     le64_to_cpu(shdr->SessionId),
-			     le16_to_cpu(shdr->Command), temp->mid);
-	return temp;
-}
-
-static int
-smb2_get_mid_entry(struct cifs_ses *ses, struct TCP_Server_Info *server,
-		   struct smb2_hdr *shdr, struct mid_q_entry **mid)
-{
-	spin_lock(&server->srv_lock);
-	if (server->tcpStatus == CifsExiting) {
-		spin_unlock(&server->srv_lock);
-		return -ENOENT;
-	}
-
-	if (server->tcpStatus == CifsNeedReconnect) {
-		spin_unlock(&server->srv_lock);
-		cifs_dbg(FYI, "tcp session dead - return to caller to retry\n");
-		return -EAGAIN;
-	}
-
-	if (server->tcpStatus == CifsNeedNegotiate &&
-	   shdr->Command != SMB2_NEGOTIATE) {
-		spin_unlock(&server->srv_lock);
-		return -EAGAIN;
-	}
-	spin_unlock(&server->srv_lock);
-
-	spin_lock(&ses->ses_lock);
-	if (ses->ses_status == SES_NEW) {
-		if ((shdr->Command != SMB2_SESSION_SETUP) &&
-		    (shdr->Command != SMB2_NEGOTIATE)) {
-			spin_unlock(&ses->ses_lock);
-			return -EAGAIN;
-		}
-		/* else ok - we are setting up session */
-	}
-
-	if (ses->ses_status == SES_EXITING) {
-		if (shdr->Command != SMB2_LOGOFF) {
-			spin_unlock(&ses->ses_lock);
-			return -EAGAIN;
-		}
-		/* else ok - we are shutting down the session */
-	}
-	spin_unlock(&ses->ses_lock);
-
-	*mid = smb2_mid_entry_alloc(shdr, server);
-	if (*mid == NULL)
-		return -ENOMEM;
-	spin_lock(&server->mid_lock);
-	list_add_tail(&(*mid)->qhead, &server->pending_mid_q);
-	spin_unlock(&server->mid_lock);
-
-	return 0;
-}
-
-int
-smb2_check_receive(struct mid_q_entry *mid, struct TCP_Server_Info *server,
-		   bool log_error)
-{
-	unsigned int len = mid->resp_buf_size;
-	struct kvec iov[1];
-	struct smb_rqst rqst = { .rq_iov = iov,
-				 .rq_nvec = 1 };
-
-	iov[0].iov_base = (char *)mid->resp_buf;
-	iov[0].iov_len = len;
-
-	dump_smb(mid->resp_buf, min_t(u32, 80, len));
-	/* convert the length into a more usable form */
-	if (len > 24 && server->sign && !mid->decrypted) {
-		int rc;
-
-		rc = smb2_verify_signature(&rqst, server);
-		if (rc)
-			cifs_server_dbg(VFS, "SMB signature verification returned error = %d\n",
-				 rc);
-	}
-
-	return map_smb2_to_linux_error(mid->resp_buf, log_error);
-}
-
-struct mid_q_entry *
-smb2_setup_request(struct cifs_ses *ses, struct TCP_Server_Info *server,
-		   struct smb_rqst *rqst)
-{
-	int rc;
-	struct smb2_hdr *shdr =
-			(struct smb2_hdr *)rqst->rq_iov[0].iov_base;
-	struct mid_q_entry *mid;
-
-	smb2_seq_num_into_buf(server, shdr);
-
-	rc = smb2_get_mid_entry(ses, server, shdr, &mid);
-	if (rc) {
-		revert_current_mid_from_hdr(server, shdr);
-		return ERR_PTR(rc);
-	}
-
-	rc = smb2_sign_rqst(rqst, server);
-	if (rc) {
-		revert_current_mid_from_hdr(server, shdr);
-		delete_mid(mid);
-		return ERR_PTR(rc);
-	}
-
-	return mid;
-}
-
-struct mid_q_entry *
-smb2_setup_async_request(struct TCP_Server_Info *server, struct smb_rqst *rqst)
-{
-	int rc;
-	struct smb2_hdr *shdr =
-			(struct smb2_hdr *)rqst->rq_iov[0].iov_base;
-	struct mid_q_entry *mid;
-
-	spin_lock(&server->srv_lock);
-	if (server->tcpStatus == CifsNeedNegotiate &&
-	   shdr->Command != SMB2_NEGOTIATE) {
-		spin_unlock(&server->srv_lock);
-		return ERR_PTR(-EAGAIN);
-	}
-	spin_unlock(&server->srv_lock);
-
-	smb2_seq_num_into_buf(server, shdr);
-
-	mid = smb2_mid_entry_alloc(shdr, server);
-	if (mid == NULL) {
-		revert_current_mid_from_hdr(server, shdr);
-		return ERR_PTR(-ENOMEM);
-	}
-
-	rc = smb2_sign_rqst(rqst, server);
-	if (rc) {
-		revert_current_mid_from_hdr(server, shdr);
-		release_mid(mid);
-		return ERR_PTR(rc);
-	}
-
-	return mid;
-}
-
-int
-smb3_crypto_aead_allocate(struct TCP_Server_Info *server)
-{
-	struct crypto_aead *tfm;
-
-	if (!server->secmech.enc) {
-		if ((server->cipher_type == SMB2_ENCRYPTION_AES128_GCM) ||
-		    (server->cipher_type == SMB2_ENCRYPTION_AES256_GCM))
-			tfm = crypto_alloc_aead("gcm(aes)", 0, 0);
-		else
-			tfm = crypto_alloc_aead("ccm(aes)", 0, 0);
-		if (IS_ERR(tfm)) {
-			cifs_server_dbg(VFS, "%s: Failed alloc encrypt aead\n",
-				 __func__);
-			return PTR_ERR(tfm);
-		}
-		server->secmech.enc = tfm;
-	}
-
-	if (!server->secmech.dec) {
-		if ((server->cipher_type == SMB2_ENCRYPTION_AES128_GCM) ||
-		    (server->cipher_type == SMB2_ENCRYPTION_AES256_GCM))
-			tfm = crypto_alloc_aead("gcm(aes)", 0, 0);
-		else
-			tfm = crypto_alloc_aead("ccm(aes)", 0, 0);
-		if (IS_ERR(tfm)) {
-			crypto_free_aead(server->secmech.enc);
-			server->secmech.enc = NULL;
-			cifs_server_dbg(VFS, "%s: Failed to alloc decrypt aead\n",
-				 __func__);
-			return PTR_ERR(tfm);
-		}
-		server->secmech.dec = tfm;
-	}
-
-	return 0;
-}