[deliverable/linux.git] / fs / cifs / smb2ops.c

/*
 *  SMB2 version specific operations
 *
 *  Copyright (c) 2012, Jeff Layton <jlayton@redhat.com>
 *
 *  This library is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License v2 as published
 *  by the Free Software Foundation.
 *
 *  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 "cifsglob.h"
#include "smb2pdu.h"
#include "smb2proto.h"
#include "cifsproto.h"
#include "cifs_debug.h"

static int
change_conf(struct TCP_Server_Info *server)
{
	server->credits += server->echo_credits + server->oplock_credits;
	server->oplock_credits = server->echo_credits = 0;
	switch (server->credits) {
	case 0:
		return -1;
	case 1:
		server->echoes = false;
		server->oplocks = false;
		cERROR(1, "disabling echoes and oplocks");
		break;
	case 2:
		server->echoes = true;
		server->oplocks = false;
		server->echo_credits = 1;
		cFYI(1, "disabling oplocks");
		break;
	default:
		server->echoes = true;
		server->oplocks = true;
		server->echo_credits = 1;
		server->oplock_credits = 1;
	}
	server->credits -= server->echo_credits + server->oplock_credits;
	return 0;
}

static void
smb2_add_credits(struct TCP_Server_Info *server, const unsigned int add,
		 const int optype)
{
	int *val, rc = 0;
	spin_lock(&server->req_lock);
	val = server->ops->get_credits_field(server, optype);
	*val += add;
	server->in_flight--;
	if (server->in_flight == 0 && (optype & CIFS_OP_MASK) != CIFS_NEG_OP)
		rc = change_conf(server);
	spin_unlock(&server->req_lock);
	wake_up(&server->request_q);
	if (rc)
		cifs_reconnect(server);
}

static void
smb2_set_credits(struct TCP_Server_Info *server, const int val)
{
	spin_lock(&server->req_lock);
	server->credits = val;
	spin_unlock(&server->req_lock);
}

static int *
smb2_get_credits_field(struct TCP_Server_Info *server, const int optype)
{
	switch (optype) {
	case CIFS_ECHO_OP:
		return &server->echo_credits;
	case CIFS_OBREAK_OP:
		return &server->oplock_credits;
	default:
		return &server->credits;
	}
}

static unsigned int
smb2_get_credits(struct mid_q_entry *mid)
{
	return le16_to_cpu(((struct smb2_hdr *)mid->resp_buf)->CreditRequest);
}

static __u64
smb2_get_next_mid(struct TCP_Server_Info *server)
{
	__u64 mid;
	/* for SMB2 we need the current value */
	spin_lock(&GlobalMid_Lock);
	mid = server->CurrentMid++;
	spin_unlock(&GlobalMid_Lock);
	return mid;
}

static struct mid_q_entry *
smb2_find_mid(struct TCP_Server_Info *server, char *buf)
{
	struct mid_q_entry *mid;
	struct smb2_hdr *hdr = (struct smb2_hdr *)buf;

	spin_lock(&GlobalMid_Lock);
	list_for_each_entry(mid, &server->pending_mid_q, qhead) {
		if ((mid->mid == hdr->MessageId) &&
		    (mid->mid_state == MID_REQUEST_SUBMITTED) &&
		    (mid->command == hdr->Command)) {
			spin_unlock(&GlobalMid_Lock);
			return mid;
		}
	}
	spin_unlock(&GlobalMid_Lock);
	return NULL;
}

static void
smb2_dump_detail(void *buf)
{
#ifdef CONFIG_CIFS_DEBUG2
	struct smb2_hdr *smb = (struct smb2_hdr *)buf;

	cERROR(1, "Cmd: %d Err: 0x%x Flags: 0x%x Mid: %llu Pid: %d",
		  smb->Command, smb->Status, smb->Flags, smb->MessageId,
		  smb->ProcessId);
	cERROR(1, "smb buf %p len %u", smb, smb2_calc_size(smb));
#endif
}

static bool
smb2_need_neg(struct TCP_Server_Info *server)
{
	return server->max_read == 0;
}

static int
smb2_negotiate(const unsigned int xid, struct cifs_ses *ses)
{
	int rc;
	ses->server->CurrentMid = 0;
	rc = SMB2_negotiate(xid, ses);
	/* BB we probably don't need to retry with modern servers */
	if (rc == -EAGAIN)
		rc = -EHOSTDOWN;
	return rc;
}

static int
smb2_is_path_accessible(const unsigned int xid, struct cifs_tcon *tcon,
			struct cifs_sb_info *cifs_sb, const char *full_path)
{
	int rc;
	__u64 persistent_fid, volatile_fid;
	__le16 *utf16_path;

	utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
	if (!utf16_path)
		return -ENOMEM;

	rc = SMB2_open(xid, tcon, utf16_path, &persistent_fid, &volatile_fid,
		       FILE_READ_ATTRIBUTES, FILE_OPEN, 0, 0);
	if (rc) {
		kfree(utf16_path);
		return rc;
	}

	rc = SMB2_close(xid, tcon, persistent_fid, volatile_fid);
	kfree(utf16_path);
	return rc;
}

static int
smb2_get_srv_inum(const unsigned int xid, struct cifs_tcon *tcon,
		  struct cifs_sb_info *cifs_sb, const char *full_path,
		  u64 *uniqueid, FILE_ALL_INFO *data)
{
	*uniqueid = le64_to_cpu(data->IndexNumber);
	return 0;
}

static char *
smb2_build_path_to_root(struct smb_vol *vol, struct cifs_sb_info *cifs_sb,
			struct cifs_tcon *tcon)
{
	int pplen = vol->prepath ? strlen(vol->prepath) : 0;
	char *full_path = NULL;

	/* if no prefix path, simply set path to the root of share to "" */
	if (pplen == 0) {
		full_path = kzalloc(2, GFP_KERNEL);
		return full_path;
	}

	cERROR(1, "prefixpath is not supported for SMB2 now");
	return NULL;
}

struct smb_version_operations smb21_operations = {
	.setup_request = smb2_setup_request,
	.check_receive = smb2_check_receive,
	.add_credits = smb2_add_credits,
	.set_credits = smb2_set_credits,
	.get_credits_field = smb2_get_credits_field,
	.get_credits = smb2_get_credits,
	.get_next_mid = smb2_get_next_mid,
	.find_mid = smb2_find_mid,
	.check_message = smb2_check_message,
	.dump_detail = smb2_dump_detail,
	.need_neg = smb2_need_neg,
	.negotiate = smb2_negotiate,
	.sess_setup = SMB2_sess_setup,
	.logoff = SMB2_logoff,
	.tree_connect = SMB2_tcon,
	.tree_disconnect = SMB2_tdis,
	.is_path_accessible = smb2_is_path_accessible,
	.query_path_info = smb2_query_path_info,
	.get_srv_inum = smb2_get_srv_inum,
	.build_path_to_root = smb2_build_path_to_root,
};

struct smb_version_values smb21_values = {
	.version_string = SMB21_VERSION_STRING,
	.header_size = sizeof(struct smb2_hdr),
	.max_header_size = MAX_SMB2_HDR_SIZE,
	.lock_cmd = SMB2_LOCK,
};
Commit	Line	Data
1080ef75 SF	1	/*
	2	* SMB2 version specific operations
	3	*
	4	* Copyright (c) 2012, Jeff Layton <jlayton@redhat.com>
	5	*
	6	* This library is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License v2 as published
	8	* by the Free Software Foundation.
	9	*
	10	* This library is distributed in the hope that it will be useful,
	11	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	12	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
	13	* the GNU Lesser General Public License for more details.
	14	*
	15	* You should have received a copy of the GNU Lesser General Public License
	16	* along with this library; if not, write to the Free Software
	17	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	18	*/
	19
	20	#include "cifsglob.h"
2dc7e1c0 PS	21	#include "smb2pdu.h"
2dc7e1c0 PS	22	#include "smb2proto.h"
28ea5290 PS	23	#include "cifsproto.h"
	24	#include "cifs_debug.h"
	25
	26	static int
	27	change_conf(struct TCP_Server_Info *server)
	28	{
	29	server->credits += server->echo_credits + server->oplock_credits;
	30	server->oplock_credits = server->echo_credits = 0;
	31	switch (server->credits) {
	32	case 0:
	33	return -1;
	34	case 1:
	35	server->echoes = false;
	36	server->oplocks = false;
	37	cERROR(1, "disabling echoes and oplocks");
	38	break;
	39	case 2:
	40	server->echoes = true;
	41	server->oplocks = false;
	42	server->echo_credits = 1;
	43	cFYI(1, "disabling oplocks");
	44	break;
	45	default:
	46	server->echoes = true;
	47	server->oplocks = true;
	48	server->echo_credits = 1;
	49	server->oplock_credits = 1;
	50	}
	51	server->credits -= server->echo_credits + server->oplock_credits;
	52	return 0;
	53	}
	54
	55	static void
	56	smb2_add_credits(struct TCP_Server_Info *server, const unsigned int add,
	57	const int optype)
	58	{
	59	int *val, rc = 0;
	60	spin_lock(&server->req_lock);
	61	val = server->ops->get_credits_field(server, optype);
	62	*val += add;
	63	server->in_flight--;
ec2e4523	64	if (server->in_flight == 0 && (optype & CIFS_OP_MASK) != CIFS_NEG_OP)
28ea5290 PS	65	rc = change_conf(server);
	66	spin_unlock(&server->req_lock);
	67	wake_up(&server->request_q);
	68	if (rc)
	69	cifs_reconnect(server);
	70	}
	71
	72	static void
	73	smb2_set_credits(struct TCP_Server_Info *server, const int val)
	74	{
	75	spin_lock(&server->req_lock);
	76	server->credits = val;
	77	spin_unlock(&server->req_lock);
	78	}
	79
	80	static int *
	81	smb2_get_credits_field(struct TCP_Server_Info *server, const int optype)
	82	{
	83	switch (optype) {
	84	case CIFS_ECHO_OP:
	85	return &server->echo_credits;
	86	case CIFS_OBREAK_OP:
	87	return &server->oplock_credits;
	88	default:
	89	return &server->credits;
	90	}
	91	}
	92
	93	static unsigned int
	94	smb2_get_credits(struct mid_q_entry *mid)
	95	{
	96	return le16_to_cpu(((struct smb2_hdr *)mid->resp_buf)->CreditRequest);
	97	}
2dc7e1c0 PS	98
	99	static __u64
	100	smb2_get_next_mid(struct TCP_Server_Info *server)
	101	{
	102	__u64 mid;
	103	/* for SMB2 we need the current value */
	104	spin_lock(&GlobalMid_Lock);
	105	mid = server->CurrentMid++;
	106	spin_unlock(&GlobalMid_Lock);
	107	return mid;
	108	}
1080ef75	109
093b2bda PS	110	static struct mid_q_entry *
	111	smb2_find_mid(struct TCP_Server_Info server, char buf)
	112	{
	113	struct mid_q_entry *mid;
	114	struct smb2_hdr hdr = (struct smb2_hdr )buf;
	115
	116	spin_lock(&GlobalMid_Lock);
	117	list_for_each_entry(mid, &server->pending_mid_q, qhead) {
	118	if ((mid->mid == hdr->MessageId) &&
	119	(mid->mid_state == MID_REQUEST_SUBMITTED) &&
	120	(mid->command == hdr->Command)) {
	121	spin_unlock(&GlobalMid_Lock);
	122	return mid;
	123	}
	124	}
	125	spin_unlock(&GlobalMid_Lock);
	126	return NULL;
	127	}
	128
	129	static void
	130	smb2_dump_detail(void *buf)
	131	{
	132	#ifdef CONFIG_CIFS_DEBUG2
	133	struct smb2_hdr smb = (struct smb2_hdr )buf;
	134
	135	cERROR(1, "Cmd: %d Err: 0x%x Flags: 0x%x Mid: %llu Pid: %d",
	136	smb->Command, smb->Status, smb->Flags, smb->MessageId,
	137	smb->ProcessId);
	138	cERROR(1, "smb buf %p len %u", smb, smb2_calc_size(smb));
	139	#endif
	140	}
	141
ec2e4523 PS	142	static bool
	143	smb2_need_neg(struct TCP_Server_Info *server)
	144	{
	145	return server->max_read == 0;
	146	}
	147
	148	static int
	149	smb2_negotiate(const unsigned int xid, struct cifs_ses *ses)
	150	{
	151	int rc;
	152	ses->server->CurrentMid = 0;
	153	rc = SMB2_negotiate(xid, ses);
	154	/* BB we probably don't need to retry with modern servers */
	155	if (rc == -EAGAIN)
	156	rc = -EHOSTDOWN;
	157	return rc;
	158	}
	159
2503a0db PS	160	static int
	161	smb2_is_path_accessible(const unsigned int xid, struct cifs_tcon *tcon,
	162	struct cifs_sb_info cifs_sb, const char full_path)
	163	{
	164	int rc;
	165	__u64 persistent_fid, volatile_fid;
	166	__le16 *utf16_path;
	167
	168	utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
	169	if (!utf16_path)
	170	return -ENOMEM;
	171
	172	rc = SMB2_open(xid, tcon, utf16_path, &persistent_fid, &volatile_fid,
	173	FILE_READ_ATTRIBUTES, FILE_OPEN, 0, 0);
	174	if (rc) {
	175	kfree(utf16_path);
	176	return rc;
	177	}
	178
	179	rc = SMB2_close(xid, tcon, persistent_fid, volatile_fid);
	180	kfree(utf16_path);
	181	return rc;
	182	}
	183
be4cb9e3 PS	184	static int
	185	smb2_get_srv_inum(const unsigned int xid, struct cifs_tcon *tcon,
	186	struct cifs_sb_info cifs_sb, const char full_path,
	187	u64 uniqueid, FILE_ALL_INFO data)
	188	{
	189	*uniqueid = le64_to_cpu(data->IndexNumber);
	190	return 0;
	191	}
	192
25e26632 PS	193	static char *
	194	smb2_build_path_to_root(struct smb_vol vol, struct cifs_sb_info cifs_sb,
	195	struct cifs_tcon *tcon)
	196	{
	197	int pplen = vol->prepath ? strlen(vol->prepath) : 0;
	198	char *full_path = NULL;
	199
	200	/* if no prefix path, simply set path to the root of share to "" */
	201	if (pplen == 0) {
	202	full_path = kzalloc(2, GFP_KERNEL);
	203	return full_path;
	204	}
	205
	206	cERROR(1, "prefixpath is not supported for SMB2 now");
	207	return NULL;
	208	}
	209
1080ef75	210	struct smb_version_operations smb21_operations = {
2dc7e1c0 PS	211	.setup_request = smb2_setup_request,
2dc7e1c0 PS	212	.check_receive = smb2_check_receive,
28ea5290 PS	213	.add_credits = smb2_add_credits,
	214	.set_credits = smb2_set_credits,
	215	.get_credits_field = smb2_get_credits_field,
	216	.get_credits = smb2_get_credits,
2dc7e1c0	217	.get_next_mid = smb2_get_next_mid,
093b2bda PS	218	.find_mid = smb2_find_mid,
	219	.check_message = smb2_check_message,
	220	.dump_detail = smb2_dump_detail,
ec2e4523 PS	221	.need_neg = smb2_need_neg,
ec2e4523 PS	222	.negotiate = smb2_negotiate,
5478f9ba PS	223	.sess_setup = SMB2_sess_setup,
5478f9ba PS	224	.logoff = SMB2_logoff,
faaf946a PS	225	.tree_connect = SMB2_tcon,
faaf946a PS	226	.tree_disconnect = SMB2_tdis,
2503a0db	227	.is_path_accessible = smb2_is_path_accessible,
be4cb9e3 PS	228	.query_path_info = smb2_query_path_info,
be4cb9e3 PS	229	.get_srv_inum = smb2_get_srv_inum,
25e26632	230	.build_path_to_root = smb2_build_path_to_root,
1080ef75 SF	231	};
	232
	233	struct smb_version_values smb21_values = {
	234	.version_string = SMB21_VERSION_STRING,
093b2bda PS	235	.header_size = sizeof(struct smb2_hdr),
093b2bda PS	236	.max_header_size = MAX_SMB2_HDR_SIZE,
2dc7e1c0	237	.lock_cmd = SMB2_LOCK,
1080ef75	238	};