| /* |
| * 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 "smb2pdu.h" |
| #include "cifsglob.h" |
| #include "cifsproto.h" |
| #include "smb2proto.h" |
| #include "cifs_debug.h" |
| #include "smb2status.h" |
| |
| /* |
| * 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 *hdr) |
| { |
| hdr->MessageId = get_next_mid(server); |
| } |
| |
| static struct mid_q_entry * |
| smb2_mid_entry_alloc(const struct smb2_hdr *smb_buffer, |
| struct TCP_Server_Info *server) |
| { |
| struct mid_q_entry *temp; |
| |
| if (server == NULL) { |
| cERROR(1, "Null TCP session in smb2_mid_entry_alloc"); |
| return NULL; |
| } |
| |
| temp = mempool_alloc(cifs_mid_poolp, GFP_NOFS); |
| if (temp == NULL) |
| return temp; |
| else { |
| memset(temp, 0, sizeof(struct mid_q_entry)); |
| temp->mid = smb_buffer->MessageId; /* always LE */ |
| temp->pid = current->pid; |
| temp->command = smb_buffer->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_hdr *buf, |
| struct mid_q_entry **mid) |
| { |
| if (ses->server->tcpStatus == CifsExiting) |
| return -ENOENT; |
| |
| if (ses->server->tcpStatus == CifsNeedReconnect) { |
| cFYI(1, "tcp session dead - return to caller to retry"); |
| return -EAGAIN; |
| } |
| |
| if (ses->status != CifsGood) { |
| /* check if SMB2 session is bad because we are setting it up */ |
| if ((buf->Command != SMB2_SESSION_SETUP) && |
| (buf->Command != SMB2_NEGOTIATE)) |
| return -EAGAIN; |
| /* else ok - we are setting up session */ |
| } |
| *mid = smb2_mid_entry_alloc(buf, 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); |
| |
| dump_smb(mid->resp_buf, min_t(u32, 80, len)); |
| /* convert the length into a more usable form */ |
| /* BB - uncomment with SMB2 signing implementation */ |
| /* if ((len > 24) && |
| (server->sec_mode & (SECMODE_SIGN_REQUIRED|SECMODE_SIGN_ENABLED))) { |
| if (smb2_verify_signature(mid->resp_buf, server)) |
| cERROR(1, "Unexpected SMB signature"); |
| } */ |
| |
| return map_smb2_to_linux_error(mid->resp_buf, log_error); |
| } |
| |
| int |
| smb2_setup_request(struct cifs_ses *ses, struct kvec *iov, |
| unsigned int nvec, struct mid_q_entry **ret_mid) |
| { |
| int rc; |
| struct smb2_hdr *hdr = (struct smb2_hdr *)iov[0].iov_base; |
| struct mid_q_entry *mid; |
| |
| smb2_seq_num_into_buf(ses->server, hdr); |
| |
| rc = smb2_get_mid_entry(ses, hdr, &mid); |
| if (rc) |
| return rc; |
| /* rc = smb2_sign_smb2(iov, nvec, ses->server); |
| if (rc) |
| delete_mid(mid); */ |
| *ret_mid = mid; |
| return rc; |
| } |
| |
| /* BB add missing functions here */ |