[Feature]add MT2731_MP2_MR2_SVN388 baseline version
Change-Id: Ief04314834b31e27effab435d3ca8ba33b499059
diff --git a/src/kernel/linux/v4.14/fs/cifs/smb2transport.c b/src/kernel/linux/v4.14/fs/cifs/smb2transport.c
new file mode 100644
index 0000000..a41fc4a
--- /dev/null
+++ b/src/kernel/linux/v4.14/fs/cifs/smb2transport.c
@@ -0,0 +1,704 @@
+/*
+ * fs/cifs/smb2transport.c
+ *
+ * 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
+ *
+ * This library is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published
+ * by the Free Software Foundation; either version 2.1 of the License, or
+ * (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
+ * the GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#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 "smb2pdu.h"
+#include "cifsglob.h"
+#include "cifsproto.h"
+#include "smb2proto.h"
+#include "cifs_debug.h"
+#include "smb2status.h"
+#include "smb2glob.h"
+
+static int
+smb2_crypto_shash_allocate(struct TCP_Server_Info *server)
+{
+ return cifs_alloc_hash("hmac(sha256)",
+ &server->secmech.hmacsha256,
+ &server->secmech.sdeschmacsha256);
+}
+
+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,
+ &p->sdeschmacsha256);
+ if (rc)
+ goto err;
+
+ rc = cifs_alloc_hash("cmac(aes)", &p->cmacaes, &p->sdesccmacaes);
+ if (rc)
+ goto err;
+
+ return 0;
+err:
+ cifs_free_hash(&p->hmacsha256, &p->sdeschmacsha256);
+ return rc;
+}
+
+#ifdef CONFIG_CIFS_SMB311
+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,
+ &p->sdeschmacsha256);
+ if (rc)
+ return rc;
+
+ rc = cifs_alloc_hash("cmac(aes)", &p->cmacaes, &p->sdesccmacaes);
+ if (rc)
+ goto err;
+
+ rc = cifs_alloc_hash("sha512", &p->sha512, &p->sdescsha512);
+ if (rc)
+ goto err;
+
+ return 0;
+
+err:
+ cifs_free_hash(&p->cmacaes, &p->sdesccmacaes);
+ cifs_free_hash(&p->hmacsha256, &p->sdeschmacsha256);
+ return rc;
+}
+#endif
+
+static struct cifs_ses *
+smb2_find_smb_ses_unlocked(struct TCP_Server_Info *server, __u64 ses_id)
+{
+ struct cifs_ses *ses;
+
+ list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
+ if (ses->Suid != ses_id)
+ continue;
+ 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);
+ spin_unlock(&cifs_tcp_ses_lock);
+
+ return tcon;
+}
+
+int
+smb2_calc_signature(struct smb_rqst *rqst, struct TCP_Server_Info *server)
+{
+ int rc;
+ unsigned char smb2_signature[SMB2_HMACSHA256_SIZE];
+ unsigned char *sigptr = smb2_signature;
+ struct kvec *iov = rqst->rq_iov;
+ struct smb2_sync_hdr *shdr = (struct smb2_sync_hdr *)iov[1].iov_base;
+ struct cifs_ses *ses;
+
+ ses = smb2_find_smb_ses(server, shdr->SessionId);
+ if (!ses) {
+ cifs_dbg(VFS, "%s: Could not find session\n", __func__);
+ return 0;
+ }
+
+ memset(smb2_signature, 0x0, SMB2_HMACSHA256_SIZE);
+ memset(shdr->Signature, 0x0, SMB2_SIGNATURE_SIZE);
+
+ rc = smb2_crypto_shash_allocate(server);
+ if (rc) {
+ cifs_dbg(VFS, "%s: shah256 alloc failed\n", __func__);
+ return rc;
+ }
+
+ rc = crypto_shash_setkey(server->secmech.hmacsha256,
+ ses->auth_key.response, SMB2_NTLMV2_SESSKEY_SIZE);
+ if (rc) {
+ cifs_dbg(VFS, "%s: Could not update with response\n", __func__);
+ return rc;
+ }
+
+ rc = crypto_shash_init(&server->secmech.sdeschmacsha256->shash);
+ if (rc) {
+ cifs_dbg(VFS, "%s: Could not init sha256", __func__);
+ return rc;
+ }
+
+ rc = __cifs_calc_signature(rqst, server, sigptr,
+ &server->secmech.sdeschmacsha256->shash);
+
+ if (!rc)
+ memcpy(shdr->Signature, sigptr, SMB2_SIGNATURE_SIZE);
+
+ 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 L[4] = {0, 0, 0, 128};
+ int rc = 0;
+ unsigned char prfhash[SMB2_HMACSHA256_SIZE];
+ unsigned char *hashptr = prfhash;
+
+ memset(prfhash, 0x0, SMB2_HMACSHA256_SIZE);
+ memset(key, 0x0, key_size);
+
+ rc = smb3_crypto_shash_allocate(ses->server);
+ if (rc) {
+ cifs_dbg(VFS, "%s: crypto alloc failed\n", __func__);
+ goto smb3signkey_ret;
+ }
+
+ rc = crypto_shash_setkey(ses->server->secmech.hmacsha256,
+ ses->auth_key.response, SMB2_NTLMV2_SESSKEY_SIZE);
+ if (rc) {
+ cifs_dbg(VFS, "%s: Could not set with session key\n", __func__);
+ goto smb3signkey_ret;
+ }
+
+ rc = crypto_shash_init(&ses->server->secmech.sdeschmacsha256->shash);
+ if (rc) {
+ cifs_dbg(VFS, "%s: Could not init sign hmac\n", __func__);
+ goto smb3signkey_ret;
+ }
+
+ rc = crypto_shash_update(&ses->server->secmech.sdeschmacsha256->shash,
+ i, 4);
+ if (rc) {
+ cifs_dbg(VFS, "%s: Could not update with n\n", __func__);
+ goto smb3signkey_ret;
+ }
+
+ rc = crypto_shash_update(&ses->server->secmech.sdeschmacsha256->shash,
+ label.iov_base, label.iov_len);
+ if (rc) {
+ cifs_dbg(VFS, "%s: Could not update with label\n", __func__);
+ goto smb3signkey_ret;
+ }
+
+ rc = crypto_shash_update(&ses->server->secmech.sdeschmacsha256->shash,
+ &zero, 1);
+ if (rc) {
+ cifs_dbg(VFS, "%s: Could not update with zero\n", __func__);
+ goto smb3signkey_ret;
+ }
+
+ rc = crypto_shash_update(&ses->server->secmech.sdeschmacsha256->shash,
+ context.iov_base, context.iov_len);
+ if (rc) {
+ cifs_dbg(VFS, "%s: Could not update with context\n", __func__);
+ goto smb3signkey_ret;
+ }
+
+ rc = crypto_shash_update(&ses->server->secmech.sdeschmacsha256->shash,
+ L, 4);
+ if (rc) {
+ cifs_dbg(VFS, "%s: Could not update with L\n", __func__);
+ goto smb3signkey_ret;
+ }
+
+ rc = crypto_shash_final(&ses->server->secmech.sdeschmacsha256->shash,
+ hashptr);
+ if (rc) {
+ cifs_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,
+ const struct derivation_triplet *ptriplet)
+{
+ int rc;
+
+ rc = generate_key(ses, ptriplet->signing.label,
+ ptriplet->signing.context, ses->smb3signingkey,
+ SMB3_SIGN_KEY_SIZE);
+ if (rc)
+ return rc;
+
+ rc = generate_key(ses, ptriplet->encryption.label,
+ ptriplet->encryption.context, ses->smb3encryptionkey,
+ SMB3_SIGN_KEY_SIZE);
+ if (rc)
+ return rc;
+
+ rc = generate_key(ses, ptriplet->decryption.label,
+ ptriplet->decryption.context,
+ ses->smb3decryptionkey, SMB3_SIGN_KEY_SIZE);
+
+ 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, "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);
+ cifs_dbg(VFS, "ServerIn Key %*ph\n",
+ SMB3_SIGN_KEY_SIZE, ses->smb3encryptionkey);
+ cifs_dbg(VFS, "ServerOut Key %*ph\n",
+ SMB3_SIGN_KEY_SIZE, ses->smb3decryptionkey);
+#endif
+ return rc;
+}
+
+int
+generate_smb30signingkey(struct cifs_ses *ses)
+
+{
+ 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, &triplet);
+}
+
+#ifdef CONFIG_CIFS_SMB311
+int
+generate_smb311signingkey(struct cifs_ses *ses)
+
+{
+ 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, &triplet);
+}
+#endif /* 311 */
+
+int
+smb3_calc_signature(struct smb_rqst *rqst, struct TCP_Server_Info *server)
+{
+ int rc = 0;
+ unsigned char smb3_signature[SMB2_CMACAES_SIZE];
+ unsigned char *sigptr = smb3_signature;
+ struct kvec *iov = rqst->rq_iov;
+ struct smb2_sync_hdr *shdr = (struct smb2_sync_hdr *)iov[1].iov_base;
+ struct cifs_ses *ses;
+
+ ses = smb2_find_smb_ses(server, shdr->SessionId);
+ if (!ses) {
+ cifs_dbg(VFS, "%s: Could not find session\n", __func__);
+ return 0;
+ }
+
+ memset(smb3_signature, 0x0, SMB2_CMACAES_SIZE);
+ memset(shdr->Signature, 0x0, SMB2_SIGNATURE_SIZE);
+
+ rc = crypto_shash_setkey(server->secmech.cmacaes,
+ ses->smb3signingkey, SMB2_CMACAES_SIZE);
+
+ if (rc) {
+ cifs_dbg(VFS, "%s: Could not set key for cmac aes\n", __func__);
+ return rc;
+ }
+
+ /*
+ * we already allocate sdesccmacaes 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(&server->secmech.sdesccmacaes->shash);
+ if (rc) {
+ cifs_dbg(VFS, "%s: Could not init cmac aes\n", __func__);
+ return rc;
+ }
+
+ rc = __cifs_calc_signature(rqst, server, sigptr,
+ &server->secmech.sdesccmacaes->shash);
+
+ if (!rc)
+ memcpy(shdr->Signature, sigptr, SMB2_SIGNATURE_SIZE);
+
+ 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_sync_hdr *shdr =
+ (struct smb2_sync_hdr *)rqst->rq_iov[1].iov_base;
+
+ if (!(shdr->Flags & SMB2_FLAGS_SIGNED) ||
+ server->tcpStatus == CifsNeedNegotiate)
+ return rc;
+
+ if (!server->session_estab) {
+ strncpy(shdr->Signature, "BSRSPYL", 8);
+ return rc;
+ }
+
+ rc = server->ops->calc_signature(rqst, server);
+
+ return rc;
+}
+
+int
+smb2_verify_signature(struct smb_rqst *rqst, struct TCP_Server_Info *server)
+{
+ unsigned int rc;
+ char server_response_sig[16];
+ struct smb2_sync_hdr *shdr =
+ (struct smb2_sync_hdr *)rqst->rq_iov[1].iov_base;
+
+ if ((shdr->Command == SMB2_NEGOTIATE) ||
+ (shdr->Command == SMB2_SESSION_SETUP) ||
+ (shdr->Command == SMB2_OPLOCK_BREAK) ||
+ (!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);
+
+ mutex_lock(&server->srv_mutex);
+ rc = server->ops->calc_signature(rqst, server);
+ mutex_unlock(&server->srv_mutex);
+
+ if (rc)
+ return rc;
+
+ if (memcmp(server_response_sig, shdr->Signature, SMB2_SIGNATURE_SIZE))
+ 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_sync_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_sync_hdr *shdr,
+ struct TCP_Server_Info *server)
+{
+ struct mid_q_entry *temp;
+
+ 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->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.
+ */
+ temp->callback = cifs_wake_up_task;
+ temp->callback_data = current;
+
+ atomic_inc(&midCount);
+ temp->mid_state = MID_REQUEST_ALLOCATED;
+ return temp;
+}
+
+static int
+smb2_get_mid_entry(struct cifs_ses *ses, struct smb2_sync_hdr *shdr,
+ struct mid_q_entry **mid)
+{
+ if (ses->server->tcpStatus == CifsExiting)
+ return -ENOENT;
+
+ if (ses->server->tcpStatus == CifsNeedReconnect) {
+ cifs_dbg(FYI, "tcp session dead - return to caller to retry\n");
+ return -EAGAIN;
+ }
+
+ if (ses->status == CifsNew) {
+ if ((shdr->Command != SMB2_SESSION_SETUP) &&
+ (shdr->Command != SMB2_NEGOTIATE))
+ return -EAGAIN;
+ /* else ok - we are setting up session */
+ }
+
+ if (ses->status == CifsExiting) {
+ if (shdr->Command != SMB2_LOGOFF)
+ return -EAGAIN;
+ /* else ok - we are shutting down the session */
+ }
+
+ *mid = smb2_mid_entry_alloc(shdr, ses->server);
+ if (*mid == NULL)
+ return -ENOMEM;
+ spin_lock(&GlobalMid_Lock);
+ list_add_tail(&(*mid)->qhead, &ses->server->pending_mid_q);
+ spin_unlock(&GlobalMid_Lock);
+ return 0;
+}
+
+int
+smb2_check_receive(struct mid_q_entry *mid, struct TCP_Server_Info *server,
+ bool log_error)
+{
+ unsigned int len = get_rfc1002_length(mid->resp_buf);
+ struct kvec iov[2];
+ struct smb_rqst rqst = { .rq_iov = iov,
+ .rq_nvec = 2 };
+
+ iov[0].iov_base = (char *)mid->resp_buf;
+ iov[0].iov_len = 4;
+ iov[1].iov_base = (char *)mid->resp_buf + 4;
+ iov[1].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_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 smb_rqst *rqst)
+{
+ int rc;
+ struct smb2_sync_hdr *shdr =
+ (struct smb2_sync_hdr *)rqst->rq_iov[1].iov_base;
+ struct mid_q_entry *mid;
+
+ smb2_seq_num_into_buf(ses->server, shdr);
+
+ rc = smb2_get_mid_entry(ses, shdr, &mid);
+ if (rc)
+ return ERR_PTR(rc);
+ rc = smb2_sign_rqst(rqst, ses->server);
+ if (rc) {
+ cifs_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_sync_hdr *shdr =
+ (struct smb2_sync_hdr *)rqst->rq_iov[1].iov_base;
+ struct mid_q_entry *mid;
+
+ smb2_seq_num_into_buf(server, shdr);
+
+ mid = smb2_mid_entry_alloc(shdr, server);
+ if (mid == NULL)
+ return ERR_PTR(-ENOMEM);
+
+ rc = smb2_sign_rqst(rqst, server);
+ if (rc) {
+ DeleteMidQEntry(mid);
+ return ERR_PTR(rc);
+ }
+
+ return mid;
+}
+
+int
+smb3_crypto_aead_allocate(struct TCP_Server_Info *server)
+{
+ struct crypto_aead *tfm;
+
+ if (!server->secmech.ccmaesencrypt) {
+ tfm = crypto_alloc_aead("ccm(aes)", 0, 0);
+ if (IS_ERR(tfm)) {
+ cifs_dbg(VFS, "%s: Failed to alloc encrypt aead\n",
+ __func__);
+ return PTR_ERR(tfm);
+ }
+ server->secmech.ccmaesencrypt = tfm;
+ }
+
+ if (!server->secmech.ccmaesdecrypt) {
+ tfm = crypto_alloc_aead("ccm(aes)", 0, 0);
+ if (IS_ERR(tfm)) {
+ crypto_free_aead(server->secmech.ccmaesencrypt);
+ server->secmech.ccmaesencrypt = NULL;
+ cifs_dbg(VFS, "%s: Failed to alloc decrypt aead\n",
+ __func__);
+ return PTR_ERR(tfm);
+ }
+ server->secmech.ccmaesdecrypt = tfm;
+ }
+
+ return 0;
+}