[people/ms/linux.git] / fs / ksmbd / connection.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *   Copyright (C) 2016 Namjae Jeon <namjae.jeon@protocolfreedom.org>
 *   Copyright (C) 2018 Samsung Electronics Co., Ltd.
 */

#include <linux/mutex.h>
#include <linux/freezer.h>
#include <linux/module.h>

#include "server.h"
#include "smb_common.h"
#include "mgmt/ksmbd_ida.h"
#include "connection.h"
#include "transport_tcp.h"
#include "transport_rdma.h"

static DEFINE_MUTEX(init_lock);

static struct ksmbd_conn_ops default_conn_ops;

LIST_HEAD(conn_list);
DEFINE_RWLOCK(conn_list_lock);

/**
 * ksmbd_conn_free() - free resources of the connection instance
 *
 * @conn:	connection instance to be cleand up
 *
 * During the thread termination, the corresponding conn instance
 * resources(sock/memory) are released and finally the conn object is freed.
 */
void ksmbd_conn_free(struct ksmbd_conn *conn)
{
	write_lock(&conn_list_lock);
	list_del(&conn->conns_list);
	write_unlock(&conn_list_lock);

	xa_destroy(&conn->sessions);
	kvfree(conn->request_buf);
	kfree(conn->preauth_info);
	kfree(conn);
}

/**
 * ksmbd_conn_alloc() - initialize a new connection instance
 *
 * Return:	ksmbd_conn struct on success, otherwise NULL
 */
struct ksmbd_conn *ksmbd_conn_alloc(void)
{
	struct ksmbd_conn *conn;

	conn = kzalloc(sizeof(struct ksmbd_conn), GFP_KERNEL);
	if (!conn)
		return NULL;

	conn->need_neg = true;
	conn->status = KSMBD_SESS_NEW;
	conn->local_nls = load_nls("utf8");
	if (!conn->local_nls)
		conn->local_nls = load_nls_default();
	atomic_set(&conn->req_running, 0);
	atomic_set(&conn->r_count, 0);
	conn->total_credits = 1;
	conn->outstanding_credits = 0;

	init_waitqueue_head(&conn->req_running_q);
	init_waitqueue_head(&conn->r_count_q);
	INIT_LIST_HEAD(&conn->conns_list);
	INIT_LIST_HEAD(&conn->requests);
	INIT_LIST_HEAD(&conn->async_requests);
	spin_lock_init(&conn->request_lock);
	spin_lock_init(&conn->credits_lock);
	ida_init(&conn->async_ida);
	xa_init(&conn->sessions);

	spin_lock_init(&conn->llist_lock);
	INIT_LIST_HEAD(&conn->lock_list);

	write_lock(&conn_list_lock);
	list_add(&conn->conns_list, &conn_list);
	write_unlock(&conn_list_lock);
	return conn;
}

bool ksmbd_conn_lookup_dialect(struct ksmbd_conn *c)
{
	struct ksmbd_conn *t;
	bool ret = false;

	read_lock(&conn_list_lock);
	list_for_each_entry(t, &conn_list, conns_list) {
		if (memcmp(t->ClientGUID, c->ClientGUID, SMB2_CLIENT_GUID_SIZE))
			continue;

		ret = true;
		break;
	}
	read_unlock(&conn_list_lock);
	return ret;
}

void ksmbd_conn_enqueue_request(struct ksmbd_work *work)
{
	struct ksmbd_conn *conn = work->conn;
	struct list_head *requests_queue = NULL;

	if (conn->ops->get_cmd_val(work) != SMB2_CANCEL_HE) {
		requests_queue = &conn->requests;
		work->syncronous = true;
	}

	if (requests_queue) {
		atomic_inc(&conn->req_running);
		spin_lock(&conn->request_lock);
		list_add_tail(&work->request_entry, requests_queue);
		spin_unlock(&conn->request_lock);
	}
}

int ksmbd_conn_try_dequeue_request(struct ksmbd_work *work)
{
	struct ksmbd_conn *conn = work->conn;
	int ret = 1;

	if (list_empty(&work->request_entry) &&
	    list_empty(&work->async_request_entry))
		return 0;

	if (!work->multiRsp)
		atomic_dec(&conn->req_running);
	spin_lock(&conn->request_lock);
	if (!work->multiRsp) {
		list_del_init(&work->request_entry);
		if (work->syncronous == false)
			list_del_init(&work->async_request_entry);
		ret = 0;
	}
	spin_unlock(&conn->request_lock);

	wake_up_all(&conn->req_running_q);
	return ret;
}

static void ksmbd_conn_lock(struct ksmbd_conn *conn)
{
	mutex_lock(&conn->srv_mutex);
}

static void ksmbd_conn_unlock(struct ksmbd_conn *conn)
{
	mutex_unlock(&conn->srv_mutex);
}

void ksmbd_conn_wait_idle(struct ksmbd_conn *conn)
{
	wait_event(conn->req_running_q, atomic_read(&conn->req_running) < 2);
}

int ksmbd_conn_write(struct ksmbd_work *work)
{
	struct ksmbd_conn *conn = work->conn;
	size_t len = 0;
	int sent;
	struct kvec iov[3];
	int iov_idx = 0;

	if (!work->response_buf) {
		pr_err("NULL response header\n");
		return -EINVAL;
	}

	if (work->tr_buf) {
		iov[iov_idx] = (struct kvec) { work->tr_buf,
				sizeof(struct smb2_transform_hdr) + 4 };
		len += iov[iov_idx++].iov_len;
	}

	if (work->aux_payload_sz) {
		iov[iov_idx] = (struct kvec) { work->response_buf, work->resp_hdr_sz };
		len += iov[iov_idx++].iov_len;
		iov[iov_idx] = (struct kvec) { work->aux_payload_buf, work->aux_payload_sz };
		len += iov[iov_idx++].iov_len;
	} else {
		if (work->tr_buf)
			iov[iov_idx].iov_len = work->resp_hdr_sz;
		else
			iov[iov_idx].iov_len = get_rfc1002_len(work->response_buf) + 4;
		iov[iov_idx].iov_base = work->response_buf;
		len += iov[iov_idx++].iov_len;
	}

	ksmbd_conn_lock(conn);
	sent = conn->transport->ops->writev(conn->transport, &iov[0],
					iov_idx, len,
					work->need_invalidate_rkey,
					work->remote_key);
	ksmbd_conn_unlock(conn);

	if (sent < 0) {
		pr_err("Failed to send message: %d\n", sent);
		return sent;
	}

	return 0;
}

int ksmbd_conn_rdma_read(struct ksmbd_conn *conn,
			 void *buf, unsigned int buflen,
			 struct smb2_buffer_desc_v1 *desc,
			 unsigned int desc_len)
{
	int ret = -EINVAL;

	if (conn->transport->ops->rdma_read)
		ret = conn->transport->ops->rdma_read(conn->transport,
						      buf, buflen,
						      desc, desc_len);
	return ret;
}

int ksmbd_conn_rdma_write(struct ksmbd_conn *conn,
			  void *buf, unsigned int buflen,
			  struct smb2_buffer_desc_v1 *desc,
			  unsigned int desc_len)
{
	int ret = -EINVAL;

	if (conn->transport->ops->rdma_write)
		ret = conn->transport->ops->rdma_write(conn->transport,
						       buf, buflen,
						       desc, desc_len);
	return ret;
}

bool ksmbd_conn_alive(struct ksmbd_conn *conn)
{
	if (!ksmbd_server_running())
		return false;

	if (conn->status == KSMBD_SESS_EXITING)
		return false;

	if (kthread_should_stop())
		return false;

	if (atomic_read(&conn->stats.open_files_count) > 0)
		return true;

	/*
	 * Stop current session if the time that get last request from client
	 * is bigger than deadtime user configured and opening file count is
	 * zero.
	 */
	if (server_conf.deadtime > 0 &&
	    time_after(jiffies, conn->last_active + server_conf.deadtime)) {
		ksmbd_debug(CONN, "No response from client in %lu minutes\n",
			    server_conf.deadtime / SMB_ECHO_INTERVAL);
		return false;
	}
	return true;
}

/**
 * ksmbd_conn_handler_loop() - session thread to listen on new smb requests
 * @p:		connection instance
 *
 * One thread each per connection
 *
 * Return:	0 on success
 */
int ksmbd_conn_handler_loop(void *p)
{
	struct ksmbd_conn *conn = (struct ksmbd_conn *)p;
	struct ksmbd_transport *t = conn->transport;
	unsigned int pdu_size;
	char hdr_buf[4] = {0,};
	int size;

	mutex_init(&conn->srv_mutex);
	__module_get(THIS_MODULE);

	if (t->ops->prepare && t->ops->prepare(t))
		goto out;

	conn->last_active = jiffies;
	while (ksmbd_conn_alive(conn)) {
		if (try_to_freeze())
			continue;

		kvfree(conn->request_buf);
		conn->request_buf = NULL;

		size = t->ops->read(t, hdr_buf, sizeof(hdr_buf));
		if (size != sizeof(hdr_buf))
			break;

		pdu_size = get_rfc1002_len(hdr_buf);
		ksmbd_debug(CONN, "RFC1002 header %u bytes\n", pdu_size);

		/*
		 * Check if pdu size is valid (min : smb header size,
		 * max : 0x00FFFFFF).
		 */
		if (pdu_size < __SMB2_HEADER_STRUCTURE_SIZE ||
		    pdu_size > MAX_STREAM_PROT_LEN) {
			continue;
		}

		/* 4 for rfc1002 length field */
		size = pdu_size + 4;
		conn->request_buf = kvmalloc(size, GFP_KERNEL);
		if (!conn->request_buf)
			continue;

		memcpy(conn->request_buf, hdr_buf, sizeof(hdr_buf));
		if (!ksmbd_smb_request(conn))
			break;

		/*
		 * We already read 4 bytes to find out PDU size, now
		 * read in PDU
		 */
		size = t->ops->read(t, conn->request_buf + 4, pdu_size);
		if (size < 0) {
			pr_err("sock_read failed: %d\n", size);
			break;
		}

		if (size != pdu_size) {
			pr_err("PDU error. Read: %d, Expected: %d\n",
			       size, pdu_size);
			continue;
		}

		if (!default_conn_ops.process_fn) {
			pr_err("No connection request callback\n");
			break;
		}

		if (default_conn_ops.process_fn(conn)) {
			pr_err("Cannot handle request\n");
			break;
		}
	}

out:
	/* Wait till all reference dropped to the Server object*/
	wait_event(conn->r_count_q, atomic_read(&conn->r_count) == 0);


	unload_nls(conn->local_nls);
	if (default_conn_ops.terminate_fn)
		default_conn_ops.terminate_fn(conn);
	t->ops->disconnect(t);
	module_put(THIS_MODULE);
	return 0;
}

void ksmbd_conn_init_server_callbacks(struct ksmbd_conn_ops *ops)
{
	default_conn_ops.process_fn = ops->process_fn;
	default_conn_ops.terminate_fn = ops->terminate_fn;
}

int ksmbd_conn_transport_init(void)
{
	int ret;

	mutex_lock(&init_lock);
	ret = ksmbd_tcp_init();
	if (ret) {
		pr_err("Failed to init TCP subsystem: %d\n", ret);
		goto out;
	}

	ret = ksmbd_rdma_init();
	if (ret) {
		pr_err("Failed to init RDMA subsystem: %d\n", ret);
		goto out;
	}
out:
	mutex_unlock(&init_lock);
	return ret;
}

static void stop_sessions(void)
{
	struct ksmbd_conn *conn;
	struct ksmbd_transport *t;

again:
	read_lock(&conn_list_lock);
	list_for_each_entry(conn, &conn_list, conns_list) {
		struct task_struct *task;

		t = conn->transport;
		task = t->handler;
		if (task)
			ksmbd_debug(CONN, "Stop session handler %s/%d\n",
				    task->comm, task_pid_nr(task));
		conn->status = KSMBD_SESS_EXITING;
		if (t->ops->shutdown) {
			read_unlock(&conn_list_lock);
			t->ops->shutdown(t);
			read_lock(&conn_list_lock);
		}
	}
	read_unlock(&conn_list_lock);

	if (!list_empty(&conn_list)) {
		schedule_timeout_interruptible(HZ / 10); /* 100ms */
		goto again;
	}
}

void ksmbd_conn_transport_destroy(void)
{
	mutex_lock(&init_lock);
	ksmbd_tcp_destroy();
	ksmbd_rdma_destroy();
	stop_sessions();
	mutex_unlock(&init_lock);
}
Commit	Line	Data
0626e664 NJ	1	// SPDX-License-Identifier: GPL-2.0-or-later
	2	/*
	3	* Copyright (C) 2016 Namjae Jeon <namjae.jeon@protocolfreedom.org>
	4	* Copyright (C) 2018 Samsung Electronics Co., Ltd.
	5	*/
	6
	7	#include <linux/mutex.h>
	8	#include <linux/freezer.h>
	9	#include <linux/module.h>
	10
	11	#include "server.h"
0626e664 NJ	12	#include "smb_common.h"
	13	#include "mgmt/ksmbd_ida.h"
	14	#include "connection.h"
	15	#include "transport_tcp.h"
	16	#include "transport_rdma.h"
	17
	18	static DEFINE_MUTEX(init_lock);
	19
	20	static struct ksmbd_conn_ops default_conn_ops;
	21
d63528eb HL	22	LIST_HEAD(conn_list);
d63528eb HL	23	DEFINE_RWLOCK(conn_list_lock);
0626e664 NJ	24
	25	/**
	26	* ksmbd_conn_free() - free resources of the connection instance
	27	*
	28	* @conn: connection instance to be cleand up
	29	*
	30	* During the thread termination, the corresponding conn instance
	31	* resources(sock/memory) are released and finally the conn object is freed.
	32	*/
	33	void ksmbd_conn_free(struct ksmbd_conn *conn)
	34	{
	35	write_lock(&conn_list_lock);
	36	list_del(&conn->conns_list);
	37	write_unlock(&conn_list_lock);
	38
e4d3e6b5	39	xa_destroy(&conn->sessions);
79f6b11a	40	kvfree(conn->request_buf);
0626e664 NJ	41	kfree(conn->preauth_info);
	42	kfree(conn);
	43	}
	44
	45	/**
	46	* ksmbd_conn_alloc() - initialize a new connection instance
	47	*
	48	* Return: ksmbd_conn struct on success, otherwise NULL
	49	*/
	50	struct ksmbd_conn *ksmbd_conn_alloc(void)
	51	{
	52	struct ksmbd_conn *conn;
	53
	54	conn = kzalloc(sizeof(struct ksmbd_conn), GFP_KERNEL);
	55	if (!conn)
	56	return NULL;
	57
	58	conn->need_neg = true;
	59	conn->status = KSMBD_SESS_NEW;
	60	conn->local_nls = load_nls("utf8");
	61	if (!conn->local_nls)
	62	conn->local_nls = load_nls_default();
	63	atomic_set(&conn->req_running, 0);
	64	atomic_set(&conn->r_count, 0);
bf8acc9e	65	conn->total_credits = 1;
376b9133	66	conn->outstanding_credits = 0;
bf8acc9e	67
0626e664	68	init_waitqueue_head(&conn->req_running_q);
a14c5738	69	init_waitqueue_head(&conn->r_count_q);
0626e664	70	INIT_LIST_HEAD(&conn->conns_list);
0626e664 NJ	71	INIT_LIST_HEAD(&conn->requests);
	72	INIT_LIST_HEAD(&conn->async_requests);
	73	spin_lock_init(&conn->request_lock);
	74	spin_lock_init(&conn->credits_lock);
d40012a8	75	ida_init(&conn->async_ida);
e4d3e6b5	76	xa_init(&conn->sessions);
0626e664	77
d63528eb HL	78	spin_lock_init(&conn->llist_lock);
	79	INIT_LIST_HEAD(&conn->lock_list);
	80
0626e664 NJ	81	write_lock(&conn_list_lock);
	82	list_add(&conn->conns_list, &conn_list);
	83	write_unlock(&conn_list_lock);
	84	return conn;
	85	}
	86
	87	bool ksmbd_conn_lookup_dialect(struct ksmbd_conn *c)
	88	{
	89	struct ksmbd_conn *t;
	90	bool ret = false;
	91
	92	read_lock(&conn_list_lock);
	93	list_for_each_entry(t, &conn_list, conns_list) {
	94	if (memcmp(t->ClientGUID, c->ClientGUID, SMB2_CLIENT_GUID_SIZE))
	95	continue;
	96
	97	ret = true;
	98	break;
	99	}
	100	read_unlock(&conn_list_lock);
	101	return ret;
	102	}
	103
	104	void ksmbd_conn_enqueue_request(struct ksmbd_work *work)
	105	{
	106	struct ksmbd_conn *conn = work->conn;
	107	struct list_head *requests_queue = NULL;
	108
	109	if (conn->ops->get_cmd_val(work) != SMB2_CANCEL_HE) {
	110	requests_queue = &conn->requests;
	111	work->syncronous = true;
	112	}
	113
	114	if (requests_queue) {
	115	atomic_inc(&conn->req_running);
	116	spin_lock(&conn->request_lock);
	117	list_add_tail(&work->request_entry, requests_queue);
	118	spin_unlock(&conn->request_lock);
	119	}
	120	}
	121
	122	int ksmbd_conn_try_dequeue_request(struct ksmbd_work *work)
	123	{
	124	struct ksmbd_conn *conn = work->conn;
	125	int ret = 1;
	126
	127	if (list_empty(&work->request_entry) &&
64b39f4a	128	list_empty(&work->async_request_entry))
0626e664 NJ	129	return 0;
0626e664 NJ	130
4b92841e HL	131	if (!work->multiRsp)
4b92841e HL	132	atomic_dec(&conn->req_running);
0626e664 NJ	133	spin_lock(&conn->request_lock);
	134	if (!work->multiRsp) {
	135	list_del_init(&work->request_entry);
	136	if (work->syncronous == false)
	137	list_del_init(&work->async_request_entry);
	138	ret = 0;
	139	}
	140	spin_unlock(&conn->request_lock);
	141
	142	wake_up_all(&conn->req_running_q);
	143	return ret;
	144	}
	145
	146	static void ksmbd_conn_lock(struct ksmbd_conn *conn)
	147	{
	148	mutex_lock(&conn->srv_mutex);
	149	}
	150
	151	static void ksmbd_conn_unlock(struct ksmbd_conn *conn)
	152	{
	153	mutex_unlock(&conn->srv_mutex);
	154	}
	155
	156	void ksmbd_conn_wait_idle(struct ksmbd_conn *conn)
	157	{
	158	wait_event(conn->req_running_q, atomic_read(&conn->req_running) < 2);
	159	}
	160
	161	int ksmbd_conn_write(struct ksmbd_work *work)
	162	{
	163	struct ksmbd_conn *conn = work->conn;
0626e664 NJ	164	size_t len = 0;
	165	int sent;
	166	struct kvec iov[3];
	167	int iov_idx = 0;
	168
cb451720	169	if (!work->response_buf) {
bde1694a	170	pr_err("NULL response header\n");
0626e664 NJ	171	return -EINVAL;
	172	}
	173
e5066499	174	if (work->tr_buf) {
0626e664	175	iov[iov_idx] = (struct kvec) { work->tr_buf,
2dd9129f	176	sizeof(struct smb2_transform_hdr) + 4 };
0626e664 NJ	177	len += iov[iov_idx++].iov_len;
	178	}
	179
e5066499	180	if (work->aux_payload_sz) {
cb451720	181	iov[iov_idx] = (struct kvec) { work->response_buf, work->resp_hdr_sz };
0626e664	182	len += iov[iov_idx++].iov_len;
e5066499	183	iov[iov_idx] = (struct kvec) { work->aux_payload_buf, work->aux_payload_sz };
0626e664 NJ	184	len += iov[iov_idx++].iov_len;
0626e664 NJ	185	} else {
e5066499 NJ	186	if (work->tr_buf)
e5066499 NJ	187	iov[iov_idx].iov_len = work->resp_hdr_sz;
0626e664	188	else
cb451720 NJ	189	iov[iov_idx].iov_len = get_rfc1002_len(work->response_buf) + 4;
cb451720 NJ	190	iov[iov_idx].iov_base = work->response_buf;
0626e664 NJ	191	len += iov[iov_idx++].iov_len;
	192	}
	193
	194	ksmbd_conn_lock(conn);
	195	sent = conn->transport->ops->writev(conn->transport, &iov[0],
	196	iov_idx, len,
	197	work->need_invalidate_rkey,
	198	work->remote_key);
	199	ksmbd_conn_unlock(conn);
	200
	201	if (sent < 0) {
bde1694a	202	pr_err("Failed to send message: %d\n", sent);
0626e664 NJ	203	return sent;
	204	}
	205
	206	return 0;
	207	}
	208
1807abcf HL	209	int ksmbd_conn_rdma_read(struct ksmbd_conn *conn,
	210	void *buf, unsigned int buflen,
	211	struct smb2_buffer_desc_v1 *desc,
	212	unsigned int desc_len)
0626e664 NJ	213	{
	214	int ret = -EINVAL;
	215
	216	if (conn->transport->ops->rdma_read)
	217	ret = conn->transport->ops->rdma_read(conn->transport,
070fb21e	218	buf, buflen,
1807abcf	219	desc, desc_len);
0626e664 NJ	220	return ret;
	221	}
	222
1807abcf HL	223	int ksmbd_conn_rdma_write(struct ksmbd_conn *conn,
	224	void *buf, unsigned int buflen,
	225	struct smb2_buffer_desc_v1 *desc,
	226	unsigned int desc_len)
0626e664 NJ	227	{
	228	int ret = -EINVAL;
	229
	230	if (conn->transport->ops->rdma_write)
	231	ret = conn->transport->ops->rdma_write(conn->transport,
070fb21e	232	buf, buflen,
1807abcf	233	desc, desc_len);
0626e664 NJ	234	return ret;
	235	}
	236
	237	bool ksmbd_conn_alive(struct ksmbd_conn *conn)
	238	{
	239	if (!ksmbd_server_running())
	240	return false;
	241
	242	if (conn->status == KSMBD_SESS_EXITING)
	243	return false;
	244
	245	if (kthread_should_stop())
	246	return false;
	247
	248	if (atomic_read(&conn->stats.open_files_count) > 0)
	249	return true;
	250
	251	/*
	252	* Stop current session if the time that get last request from client
a9c241d0	253	* is bigger than deadtime user configured and opening file count is
0626e664 NJ	254	* zero.
	255	*/
	256	if (server_conf.deadtime > 0 &&
64b39f4a	257	time_after(jiffies, conn->last_active + server_conf.deadtime)) {
0626e664	258	ksmbd_debug(CONN, "No response from client in %lu minutes\n",
070fb21e	259	server_conf.deadtime / SMB_ECHO_INTERVAL);
0626e664 NJ	260	return false;
	261	}
	262	return true;
	263	}
	264
	265	/**
	266	* ksmbd_conn_handler_loop() - session thread to listen on new smb requests
	267	* @p: connection instance
	268	*
	269	* One thread each per connection
	270	*
	271	* Return: 0 on success
	272	*/
	273	int ksmbd_conn_handler_loop(void *p)
	274	{
	275	struct ksmbd_conn conn = (struct ksmbd_conn )p;
	276	struct ksmbd_transport *t = conn->transport;
	277	unsigned int pdu_size;
	278	char hdr_buf[4] = {0,};
	279	int size;
	280
	281	mutex_init(&conn->srv_mutex);
	282	__module_get(THIS_MODULE);
	283
	284	if (t->ops->prepare && t->ops->prepare(t))
	285	goto out;
	286
	287	conn->last_active = jiffies;
	288	while (ksmbd_conn_alive(conn)) {
	289	if (try_to_freeze())
	290	continue;
	291
79f6b11a	292	kvfree(conn->request_buf);
0626e664 NJ	293	conn->request_buf = NULL;
	294
	295	size = t->ops->read(t, hdr_buf, sizeof(hdr_buf));
	296	if (size != sizeof(hdr_buf))
	297	break;
	298
	299	pdu_size = get_rfc1002_len(hdr_buf);
	300	ksmbd_debug(CONN, "RFC1002 header %u bytes\n", pdu_size);
	301
36399990 NJ	302	/*
	303	* Check if pdu size is valid (min : smb header size,
	304	* max : 0x00FFFFFF).
	305	*/
	306	if (pdu_size < __SMB2_HEADER_STRUCTURE_SIZE \|\|
	307	pdu_size > MAX_STREAM_PROT_LEN) {
0626e664 NJ	308	continue;
	309	}
	310
	311	/* 4 for rfc1002 length field */
	312	size = pdu_size + 4;
79f6b11a	313	conn->request_buf = kvmalloc(size, GFP_KERNEL);
0626e664 NJ	314	if (!conn->request_buf)
	315	continue;
	316
	317	memcpy(conn->request_buf, hdr_buf, sizeof(hdr_buf));
	318	if (!ksmbd_smb_request(conn))
	319	break;
	320
	321	/*
	322	* We already read 4 bytes to find out PDU size, now
	323	* read in PDU
	324	*/
	325	size = t->ops->read(t, conn->request_buf + 4, pdu_size);
	326	if (size < 0) {
bde1694a	327	pr_err("sock_read failed: %d\n", size);
0626e664 NJ	328	break;
	329	}
	330
	331	if (size != pdu_size) {
bde1694a NJ	332	pr_err("PDU error. Read: %d, Expected: %d\n",
bde1694a NJ	333	size, pdu_size);
0626e664 NJ	334	continue;
	335	}
	336
	337	if (!default_conn_ops.process_fn) {
bde1694a	338	pr_err("No connection request callback\n");
0626e664 NJ	339	break;
	340	}
	341
	342	if (default_conn_ops.process_fn(conn)) {
bde1694a	343	pr_err("Cannot handle request\n");
0626e664 NJ	344	break;
	345	}
	346	}
	347
	348	out:
	349	/* Wait till all reference dropped to the Server object*/
a14c5738 NJ	350	wait_event(conn->r_count_q, atomic_read(&conn->r_count) == 0);
a14c5738 NJ	351
0626e664 NJ	352
	353	unload_nls(conn->local_nls);
	354	if (default_conn_ops.terminate_fn)
	355	default_conn_ops.terminate_fn(conn);
	356	t->ops->disconnect(t);
	357	module_put(THIS_MODULE);
	358	return 0;
	359	}
	360
	361	void ksmbd_conn_init_server_callbacks(struct ksmbd_conn_ops *ops)
	362	{
	363	default_conn_ops.process_fn = ops->process_fn;
	364	default_conn_ops.terminate_fn = ops->terminate_fn;
	365	}
	366
	367	int ksmbd_conn_transport_init(void)
	368	{
	369	int ret;
	370
	371	mutex_lock(&init_lock);
	372	ret = ksmbd_tcp_init();
	373	if (ret) {
	374	pr_err("Failed to init TCP subsystem: %d\n", ret);
	375	goto out;
	376	}
	377
	378	ret = ksmbd_rdma_init();
	379	if (ret) {
0a427cc6	380	pr_err("Failed to init RDMA subsystem: %d\n", ret);
0626e664 NJ	381	goto out;
	382	}
	383	out:
	384	mutex_unlock(&init_lock);
	385	return ret;
	386	}
	387
	388	static void stop_sessions(void)
	389	{
	390	struct ksmbd_conn *conn;
136dff3a	391	struct ksmbd_transport *t;
0626e664 NJ	392
	393	again:
	394	read_lock(&conn_list_lock);
	395	list_for_each_entry(conn, &conn_list, conns_list) {
	396	struct task_struct *task;
	397
136dff3a YC	398	t = conn->transport;
136dff3a YC	399	task = t->handler;
0626e664 NJ	400	if (task)
0626e664 NJ	401	ksmbd_debug(CONN, "Stop session handler %s/%d\n",
070fb21e	402	task->comm, task_pid_nr(task));
0626e664	403	conn->status = KSMBD_SESS_EXITING;
136dff3a YC	404	if (t->ops->shutdown) {
	405	read_unlock(&conn_list_lock);
	406	t->ops->shutdown(t);
	407	read_lock(&conn_list_lock);
	408	}
0626e664 NJ	409	}
	410	read_unlock(&conn_list_lock);
	411
	412	if (!list_empty(&conn_list)) {
64b39f4a	413	schedule_timeout_interruptible(HZ / 10); /* 100ms */
0626e664 NJ	414	goto again;
	415	}
	416	}
	417
	418	void ksmbd_conn_transport_destroy(void)
	419	{
	420	mutex_lock(&init_lock);
	421	ksmbd_tcp_destroy();
	422	ksmbd_rdma_destroy();
	423	stop_sessions();
	424	mutex_unlock(&init_lock);
	425	}