[deliverable/linux.git] / fs / cifs / smb2transport.c

/*
 *   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 */
Commit	Line	Data
2dc7e1c0 PS	1	/*
	2	* fs/cifs/smb2transport.c
	3	*
	4	* Copyright (C) International Business Machines Corp., 2002, 2011
	5	* Etersoft, 2012
	6	* Author(s): Steve French (sfrench@us.ibm.com)
	7	* Jeremy Allison (jra@samba.org) 2006
	8	* Pavel Shilovsky (pshilovsky@samba.org) 2012
	9	*
	10	* This library is free software; you can redistribute it and/or modify
	11	* it under the terms of the GNU Lesser General Public License as published
	12	* by the Free Software Foundation; either version 2.1 of the License, or
	13	* (at your option) any later version.
	14	*
	15	* This library is distributed in the hope that it will be useful,
	16	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	17	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
	18	* the GNU Lesser General Public License for more details.
	19	*
	20	* You should have received a copy of the GNU Lesser General Public License
	21	* along with this library; if not, write to the Free Software
	22	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	23	*/
	24
	25	#include <linux/fs.h>
	26	#include <linux/list.h>
	27	#include <linux/wait.h>
	28	#include <linux/net.h>
	29	#include <linux/delay.h>
	30	#include <linux/uaccess.h>
	31	#include <asm/processor.h>
	32	#include <linux/mempool.h>
	33	#include "smb2pdu.h"
	34	#include "cifsglob.h"
	35	#include "cifsproto.h"
	36	#include "smb2proto.h"
	37	#include "cifs_debug.h"
	38	#include "smb2status.h"
	39
	40	/*
	41	* Set message id for the request. Should be called after wait_for_free_request
	42	* and when srv_mutex is held.
	43	*/
	44	static inline void
	45	smb2_seq_num_into_buf(struct TCP_Server_Info server, struct smb2_hdr hdr)
	46	{
	47	hdr->MessageId = get_next_mid(server);
	48	}
	49
	50	static struct mid_q_entry *
	51	smb2_mid_entry_alloc(const struct smb2_hdr *smb_buffer,
	52	struct TCP_Server_Info *server)
	53	{
	54	struct mid_q_entry *temp;
	55
	56	if (server == NULL) {
	57	cERROR(1, "Null TCP session in smb2_mid_entry_alloc");
	58	return NULL;
	59	}
	60
	61	temp = mempool_alloc(cifs_mid_poolp, GFP_NOFS);
	62	if (temp == NULL)
	63	return temp;
	64	else {
65	memset(temp, 0, sizeof(struct mid_q_entry));
66	temp->mid = smb_buffer->MessageId; /* always LE */
67	temp->pid = current->pid;
68	temp->command = smb_buffer->Command; /* Always LE */
69	temp->when_alloc = jiffies;
70	temp->server = server;
71
72	/*
73	* The default is for the mid to be synchronous, so the
74	* default callback just wakes up the current task.
75	*/
76	temp->callback = cifs_wake_up_task;
77	temp->callback_data = current;
78	}
79
80	atomic_inc(&midCount);
81	temp->mid_state = MID_REQUEST_ALLOCATED;
82	return temp;
83	}
84
85	static int
86	smb2_get_mid_entry(struct cifs_ses ses, struct smb2_hdr buf,
87	struct mid_q_entry **mid)
88	{
89	if (ses->server->tcpStatus == CifsExiting)
90	return -ENOENT;
91
92	if (ses->server->tcpStatus == CifsNeedReconnect) {
93	cFYI(1, "tcp session dead - return to caller to retry");
94	return -EAGAIN;
95	}
96
97	if (ses->status != CifsGood) {
98	/* check if SMB2 session is bad because we are setting it up */
99	if ((buf->Command != SMB2_SESSION_SETUP) &&
100	(buf->Command != SMB2_NEGOTIATE))
101	return -EAGAIN;
102	/* else ok - we are setting up session */
103	}
104	*mid = smb2_mid_entry_alloc(buf, ses->server);
105	if (*mid == NULL)
106	return -ENOMEM;
107	spin_lock(&GlobalMid_Lock);
108	list_add_tail(&(*mid)->qhead, &ses->server->pending_mid_q);
109	spin_unlock(&GlobalMid_Lock);
110	return 0;
111	}
112
113	int
114	smb2_check_receive(struct mid_q_entry mid, struct TCP_Server_Info server,
115	bool log_error)
116	{
117	unsigned int len = get_rfc1002_length(mid->resp_buf);
118
119	dump_smb(mid->resp_buf, min_t(u32, 80, len));
120	/* convert the length into a more usable form */
121	/* BB - uncomment with SMB2 signing implementation */
122	/* if ((len > 24) &&
123	(server->sec_mode & (SECMODE_SIGN_REQUIRED\|SECMODE_SIGN_ENABLED))) {
124	if (smb2_verify_signature(mid->resp_buf, server))
125	cERROR(1, "Unexpected SMB signature");
126	} */
127
128	return map_smb2_to_linux_error(mid->resp_buf, log_error);
129	}
130
131	int
132	smb2_setup_request(struct cifs_ses ses, struct kvec iov,
133	unsigned int nvec, struct mid_q_entry **ret_mid)
134	{
135	int rc;
136	struct smb2_hdr hdr = (struct smb2_hdr )iov[0].iov_base;
137	struct mid_q_entry *mid;
138
139	smb2_seq_num_into_buf(ses->server, hdr);
140
141	rc = smb2_get_mid_entry(ses, hdr, &mid);
142	if (rc)
143	return rc;
144	/* rc = smb2_sign_smb2(iov, nvec, ses->server);
145	if (rc)
146	delete_mid(mid); */
147	*ret_mid = mid;
148	return rc;
149	}
150
151	/* BB add missing functions here */