[linux-block.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);
DECLARE_RWSEM(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)
{
	down_write(&conn_list_lock);
	list_del(&conn->conns_list);
	up_write(&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;
	ksmbd_conn_set_new(conn);
	conn->local_nls = load_nls("utf8");
	if (!conn->local_nls)
		conn->local_nls = load_nls_default();
	if (IS_ENABLED(CONFIG_UNICODE))
		conn->um = utf8_load(UNICODE_AGE(12, 1, 0));
	else
		conn->um = ERR_PTR(-EOPNOTSUPP);
	if (IS_ERR(conn->um))
		conn->um = NULL;
	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);

	down_write(&conn_list_lock);
	list_add(&conn->conns_list, &conn_list);
	up_write(&conn_list_lock);
	return conn;
}

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

	down_read(&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;
	}
	up_read(&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;

	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);
	if (!work->multiRsp) {
		spin_lock(&conn->request_lock);
		list_del_init(&work->request_entry);
		spin_unlock(&conn->request_lock);
		if (work->asynchronous)
			release_async_work(work);
		ret = 0;
	}

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

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

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

void ksmbd_all_conn_set_status(u64 sess_id, u32 status)
{
	struct ksmbd_conn *conn;

	down_read(&conn_list_lock);
	list_for_each_entry(conn, &conn_list, conns_list) {
		if (conn->binding || xa_load(&conn->sessions, sess_id))
			WRITE_ONCE(conn->status, status);
	}
	up_read(&conn_list_lock);
}

void ksmbd_conn_wait_idle(struct ksmbd_conn *conn, u64 sess_id)
{
	struct ksmbd_conn *bind_conn;

	wait_event(conn->req_running_q, atomic_read(&conn->req_running) < 2);

	down_read(&conn_list_lock);
	list_for_each_entry(bind_conn, &conn_list, conns_list) {
		if (bind_conn == conn)
			continue;

		if ((bind_conn->binding || xa_load(&bind_conn->sessions, sess_id)) &&
		    !ksmbd_conn_releasing(bind_conn) &&
		    atomic_read(&bind_conn->req_running)) {
			wait_event(bind_conn->req_running_q,
				atomic_read(&bind_conn->req_running) == 0);
		}
	}
	up_read(&conn_list_lock);
}

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 (ksmbd_conn_exiting(conn))
		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, max_allowed_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), -1);
		if (size != sizeof(hdr_buf))
			break;

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

		if (ksmbd_conn_good(conn))
			max_allowed_pdu_size =
				SMB3_MAX_MSGSIZE + conn->vals->max_write_size;
		else
			max_allowed_pdu_size = SMB3_MAX_MSGSIZE;

		if (pdu_size > max_allowed_pdu_size) {
			pr_err_ratelimited("PDU length(%u) exceeded maximum allowed pdu size(%u) on connection(%d)\n",
					pdu_size, max_allowed_pdu_size,
					READ_ONCE(conn->status));
			break;
		}

		/*
		 * Check maximum pdu size(0x00FFFFFF).
		 */
		if (pdu_size > MAX_STREAM_PROT_LEN)
			break;

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

		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, 2);
		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:
	ksmbd_conn_set_releasing(conn);
	/* Wait till all reference dropped to the Server object*/
	wait_event(conn->r_count_q, atomic_read(&conn->r_count) == 0);

	if (IS_ENABLED(CONFIG_UNICODE))
		utf8_unload(conn->um);
	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:
	down_read(&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));
		ksmbd_conn_set_exiting(conn);
		if (t->ops->shutdown) {
			up_read(&conn_list_lock);
			t->ops->shutdown(t);
			down_read(&conn_list_lock);
		}
	}
	up_read(&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	22	LIST_HEAD(conn_list);
abcc506a	23	DECLARE_RWSEM(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	{
abcc506a	35	down_write(&conn_list_lock);
0626e664	36	list_del(&conn->conns_list);
abcc506a	37	up_write(&conn_list_lock);
0626e664	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;
f5c779b7	59	ksmbd_conn_set_new(conn);
0626e664 NJ	60	conn->local_nls = load_nls("utf8");
	61	if (!conn->local_nls)
	62	conn->local_nls = load_nls_default();
16b5f54e AH	63	if (IS_ENABLED(CONFIG_UNICODE))
	64	conn->um = utf8_load(UNICODE_AGE(12, 1, 0));
	65	else
	66	conn->um = ERR_PTR(-EOPNOTSUPP);
	67	if (IS_ERR(conn->um))
	68	conn->um = NULL;
0626e664 NJ	69	atomic_set(&conn->req_running, 0);
0626e664 NJ	70	atomic_set(&conn->r_count, 0);
bf8acc9e	71	conn->total_credits = 1;
376b9133	72	conn->outstanding_credits = 0;
bf8acc9e	73
0626e664	74	init_waitqueue_head(&conn->req_running_q);
a14c5738	75	init_waitqueue_head(&conn->r_count_q);
0626e664	76	INIT_LIST_HEAD(&conn->conns_list);
0626e664 NJ	77	INIT_LIST_HEAD(&conn->requests);
	78	INIT_LIST_HEAD(&conn->async_requests);
	79	spin_lock_init(&conn->request_lock);
	80	spin_lock_init(&conn->credits_lock);
d40012a8	81	ida_init(&conn->async_ida);
e4d3e6b5	82	xa_init(&conn->sessions);
0626e664	83
d63528eb HL	84	spin_lock_init(&conn->llist_lock);
	85	INIT_LIST_HEAD(&conn->lock_list);
	86
abcc506a	87	down_write(&conn_list_lock);
0626e664	88	list_add(&conn->conns_list, &conn_list);
abcc506a	89	up_write(&conn_list_lock);
0626e664 NJ	90	return conn;
	91	}
	92
	93	bool ksmbd_conn_lookup_dialect(struct ksmbd_conn *c)
	94	{
	95	struct ksmbd_conn *t;
	96	bool ret = false;
	97
abcc506a	98	down_read(&conn_list_lock);
0626e664 NJ	99	list_for_each_entry(t, &conn_list, conns_list) {
	100	if (memcmp(t->ClientGUID, c->ClientGUID, SMB2_CLIENT_GUID_SIZE))
	101	continue;
	102
	103	ret = true;
	104	break;
	105	}
abcc506a	106	up_read(&conn_list_lock);
0626e664 NJ	107	return ret;
	108	}
	109
	110	void ksmbd_conn_enqueue_request(struct ksmbd_work *work)
	111	{
	112	struct ksmbd_conn *conn = work->conn;
	113	struct list_head *requests_queue = NULL;
	114
3a9b557f	115	if (conn->ops->get_cmd_val(work) != SMB2_CANCEL_HE)
0626e664	116	requests_queue = &conn->requests;
0626e664 NJ	117
	118	if (requests_queue) {
	119	atomic_inc(&conn->req_running);
	120	spin_lock(&conn->request_lock);
	121	list_add_tail(&work->request_entry, requests_queue);
	122	spin_unlock(&conn->request_lock);
	123	}
	124	}
	125
	126	int ksmbd_conn_try_dequeue_request(struct ksmbd_work *work)
	127	{
	128	struct ksmbd_conn *conn = work->conn;
	129	int ret = 1;
	130
	131	if (list_empty(&work->request_entry) &&
64b39f4a	132	list_empty(&work->async_request_entry))
0626e664 NJ	133	return 0;
0626e664 NJ	134
4b92841e HL	135	if (!work->multiRsp)
4b92841e HL	136	atomic_dec(&conn->req_running);
0626e664	137	if (!work->multiRsp) {
3a9b557f	138	spin_lock(&conn->request_lock);
0626e664	139	list_del_init(&work->request_entry);
3a9b557f NJ	140	spin_unlock(&conn->request_lock);
	141	if (work->asynchronous)
	142	release_async_work(work);
0626e664 NJ	143	ret = 0;
0626e664 NJ	144	}
0626e664 NJ	145
	146	wake_up_all(&conn->req_running_q);
	147	return ret;
	148	}
	149
f5c779b7	150	void ksmbd_conn_lock(struct ksmbd_conn *conn)
0626e664 NJ	151	{
	152	mutex_lock(&conn->srv_mutex);
	153	}
	154
f5c779b7	155	void ksmbd_conn_unlock(struct ksmbd_conn *conn)
0626e664 NJ	156	{
	157	mutex_unlock(&conn->srv_mutex);
	158	}
	159
abcc506a	160	void ksmbd_all_conn_set_status(u64 sess_id, u32 status)
0626e664	161	{
abcc506a NJ	162	struct ksmbd_conn *conn;
	163
	164	down_read(&conn_list_lock);
	165	list_for_each_entry(conn, &conn_list, conns_list) {
	166	if (conn->binding \|\| xa_load(&conn->sessions, sess_id))
	167	WRITE_ONCE(conn->status, status);
	168	}
	169	up_read(&conn_list_lock);
	170	}
	171
	172	void ksmbd_conn_wait_idle(struct ksmbd_conn *conn, u64 sess_id)
	173	{
	174	struct ksmbd_conn *bind_conn;
	175
0626e664	176	wait_event(conn->req_running_q, atomic_read(&conn->req_running) < 2);
abcc506a NJ	177
	178	down_read(&conn_list_lock);
	179	list_for_each_entry(bind_conn, &conn_list, conns_list) {
	180	if (bind_conn == conn)
	181	continue;
	182
	183	if ((bind_conn->binding \|\| xa_load(&bind_conn->sessions, sess_id)) &&
	184	!ksmbd_conn_releasing(bind_conn) &&
	185	atomic_read(&bind_conn->req_running)) {
	186	wait_event(bind_conn->req_running_q,
	187	atomic_read(&bind_conn->req_running) == 0);
	188	}
	189	}
	190	up_read(&conn_list_lock);
0626e664 NJ	191	}
	192
	193	int ksmbd_conn_write(struct ksmbd_work *work)
	194	{
	195	struct ksmbd_conn *conn = work->conn;
0626e664 NJ	196	size_t len = 0;
	197	int sent;
	198	struct kvec iov[3];
	199	int iov_idx = 0;
	200
cb451720	201	if (!work->response_buf) {
bde1694a	202	pr_err("NULL response header\n");
0626e664 NJ	203	return -EINVAL;
	204	}
	205
e5066499	206	if (work->tr_buf) {
0626e664	207	iov[iov_idx] = (struct kvec) { work->tr_buf,
2dd9129f	208	sizeof(struct smb2_transform_hdr) + 4 };
0626e664 NJ	209	len += iov[iov_idx++].iov_len;
	210	}
	211
e5066499	212	if (work->aux_payload_sz) {
cb451720	213	iov[iov_idx] = (struct kvec) { work->response_buf, work->resp_hdr_sz };
0626e664	214	len += iov[iov_idx++].iov_len;
e5066499	215	iov[iov_idx] = (struct kvec) { work->aux_payload_buf, work->aux_payload_sz };
0626e664 NJ	216	len += iov[iov_idx++].iov_len;
0626e664 NJ	217	} else {
e5066499 NJ	218	if (work->tr_buf)
e5066499 NJ	219	iov[iov_idx].iov_len = work->resp_hdr_sz;
0626e664	220	else
cb451720 NJ	221	iov[iov_idx].iov_len = get_rfc1002_len(work->response_buf) + 4;
cb451720 NJ	222	iov[iov_idx].iov_base = work->response_buf;
0626e664 NJ	223	len += iov[iov_idx++].iov_len;
	224	}
	225
	226	ksmbd_conn_lock(conn);
	227	sent = conn->transport->ops->writev(conn->transport, &iov[0],
	228	iov_idx, len,
	229	work->need_invalidate_rkey,
	230	work->remote_key);
	231	ksmbd_conn_unlock(conn);
	232
	233	if (sent < 0) {
bde1694a	234	pr_err("Failed to send message: %d\n", sent);
0626e664 NJ	235	return sent;
	236	}
	237
	238	return 0;
	239	}
	240
1807abcf HL	241	int ksmbd_conn_rdma_read(struct ksmbd_conn *conn,
	242	void *buf, unsigned int buflen,
	243	struct smb2_buffer_desc_v1 *desc,
	244	unsigned int desc_len)
0626e664 NJ	245	{
	246	int ret = -EINVAL;
	247
	248	if (conn->transport->ops->rdma_read)
	249	ret = conn->transport->ops->rdma_read(conn->transport,
070fb21e	250	buf, buflen,
1807abcf	251	desc, desc_len);
0626e664 NJ	252	return ret;
	253	}
	254
1807abcf HL	255	int ksmbd_conn_rdma_write(struct ksmbd_conn *conn,
	256	void *buf, unsigned int buflen,
	257	struct smb2_buffer_desc_v1 *desc,
	258	unsigned int desc_len)
0626e664 NJ	259	{
	260	int ret = -EINVAL;
	261
	262	if (conn->transport->ops->rdma_write)
	263	ret = conn->transport->ops->rdma_write(conn->transport,
070fb21e	264	buf, buflen,
1807abcf	265	desc, desc_len);
0626e664 NJ	266	return ret;
	267	}
	268
	269	bool ksmbd_conn_alive(struct ksmbd_conn *conn)
	270	{
	271	if (!ksmbd_server_running())
	272	return false;
	273
f5c779b7	274	if (ksmbd_conn_exiting(conn))
0626e664 NJ	275	return false;
	276
	277	if (kthread_should_stop())
	278	return false;
	279
	280	if (atomic_read(&conn->stats.open_files_count) > 0)
	281	return true;
	282
	283	/*
	284	* Stop current session if the time that get last request from client
a9c241d0	285	* is bigger than deadtime user configured and opening file count is
0626e664 NJ	286	* zero.
	287	*/
	288	if (server_conf.deadtime > 0 &&
64b39f4a	289	time_after(jiffies, conn->last_active + server_conf.deadtime)) {
0626e664	290	ksmbd_debug(CONN, "No response from client in %lu minutes\n",
070fb21e	291	server_conf.deadtime / SMB_ECHO_INTERVAL);
0626e664 NJ	292	return false;
	293	}
	294	return true;
	295	}
	296
	297	/**
	298	* ksmbd_conn_handler_loop() - session thread to listen on new smb requests
	299	* @p: connection instance
	300	*
	301	* One thread each per connection
	302	*
	303	* Return: 0 on success
	304	*/
	305	int ksmbd_conn_handler_loop(void *p)
	306	{
	307	struct ksmbd_conn conn = (struct ksmbd_conn )p;
	308	struct ksmbd_transport *t = conn->transport;
62c487b5	309	unsigned int pdu_size, max_allowed_pdu_size;
0626e664 NJ	310	char hdr_buf[4] = {0,};
	311	int size;
	312
	313	mutex_init(&conn->srv_mutex);
	314	__module_get(THIS_MODULE);
	315
	316	if (t->ops->prepare && t->ops->prepare(t))
	317	goto out;
	318
	319	conn->last_active = jiffies;
	320	while (ksmbd_conn_alive(conn)) {
	321	if (try_to_freeze())
	322	continue;
	323
79f6b11a	324	kvfree(conn->request_buf);
0626e664 NJ	325	conn->request_buf = NULL;
0626e664 NJ	326
be6f42fa	327	size = t->ops->read(t, hdr_buf, sizeof(hdr_buf), -1);
0626e664 NJ	328	if (size != sizeof(hdr_buf))
	329	break;
	330
	331	pdu_size = get_rfc1002_len(hdr_buf);
	332	ksmbd_debug(CONN, "RFC1002 header %u bytes\n", pdu_size);
	333
f5c779b7	334	if (ksmbd_conn_good(conn))
62c487b5 NJ	335	max_allowed_pdu_size =
	336	SMB3_MAX_MSGSIZE + conn->vals->max_write_size;
	337	else
	338	max_allowed_pdu_size = SMB3_MAX_MSGSIZE;
	339
	340	if (pdu_size > max_allowed_pdu_size) {
7a17c61e	341	pr_err_ratelimited("PDU length(%u) exceeded maximum allowed pdu size(%u) on connection(%d)\n",
62c487b5	342	pdu_size, max_allowed_pdu_size,
f5c779b7	343	READ_ONCE(conn->status));
62c487b5 NJ	344	break;
	345	}
	346
36399990	347	/*
39b291b8	348	* Check maximum pdu size(0x00FFFFFF).
36399990	349	*/
39b291b8	350	if (pdu_size > MAX_STREAM_PROT_LEN)
62c487b5	351	break;
0626e664 NJ	352
	353	/* 4 for rfc1002 length field */
	354	size = pdu_size + 4;
e416ea62	355	conn->request_buf = kvmalloc(size, GFP_KERNEL);
0626e664	356	if (!conn->request_buf)
83dcedd5	357	break;
0626e664 NJ	358
	359	memcpy(conn->request_buf, hdr_buf, sizeof(hdr_buf));
	360	if (!ksmbd_smb_request(conn))
	361	break;
	362
	363	/*
	364	* We already read 4 bytes to find out PDU size, now
	365	* read in PDU
	366	*/
be6f42fa	367	size = t->ops->read(t, conn->request_buf + 4, pdu_size, 2);
0626e664	368	if (size < 0) {
bde1694a	369	pr_err("sock_read failed: %d\n", size);
0626e664 NJ	370	break;
	371	}
	372
	373	if (size != pdu_size) {
bde1694a NJ	374	pr_err("PDU error. Read: %d, Expected: %d\n",
bde1694a NJ	375	size, pdu_size);
0626e664 NJ	376	continue;
	377	}
	378
	379	if (!default_conn_ops.process_fn) {
bde1694a	380	pr_err("No connection request callback\n");
0626e664 NJ	381	break;
	382	}
	383
	384	if (default_conn_ops.process_fn(conn)) {
bde1694a	385	pr_err("Cannot handle request\n");
0626e664 NJ	386	break;
	387	}
	388	}
	389
	390	out:
abcc506a	391	ksmbd_conn_set_releasing(conn);
0626e664	392	/* Wait till all reference dropped to the Server object*/
a14c5738 NJ	393	wait_event(conn->r_count_q, atomic_read(&conn->r_count) == 0);
a14c5738 NJ	394
16b5f54e AH	395	if (IS_ENABLED(CONFIG_UNICODE))
16b5f54e AH	396	utf8_unload(conn->um);
0626e664 NJ	397	unload_nls(conn->local_nls);
	398	if (default_conn_ops.terminate_fn)
	399	default_conn_ops.terminate_fn(conn);
	400	t->ops->disconnect(t);
	401	module_put(THIS_MODULE);
	402	return 0;
	403	}
	404
	405	void ksmbd_conn_init_server_callbacks(struct ksmbd_conn_ops *ops)
	406	{
	407	default_conn_ops.process_fn = ops->process_fn;
	408	default_conn_ops.terminate_fn = ops->terminate_fn;
	409	}
	410
	411	int ksmbd_conn_transport_init(void)
	412	{
	413	int ret;
	414
	415	mutex_lock(&init_lock);
	416	ret = ksmbd_tcp_init();
	417	if (ret) {
	418	pr_err("Failed to init TCP subsystem: %d\n", ret);
	419	goto out;
	420	}
	421
	422	ret = ksmbd_rdma_init();
	423	if (ret) {
0a427cc6	424	pr_err("Failed to init RDMA subsystem: %d\n", ret);
0626e664 NJ	425	goto out;
	426	}
	427	out:
	428	mutex_unlock(&init_lock);
	429	return ret;
	430	}
	431
	432	static void stop_sessions(void)
	433	{
	434	struct ksmbd_conn *conn;
136dff3a	435	struct ksmbd_transport *t;
0626e664 NJ	436
0626e664 NJ	437	again:
abcc506a	438	down_read(&conn_list_lock);
0626e664 NJ	439	list_for_each_entry(conn, &conn_list, conns_list) {
	440	struct task_struct *task;
	441
136dff3a YC	442	t = conn->transport;
136dff3a YC	443	task = t->handler;
0626e664 NJ	444	if (task)
0626e664 NJ	445	ksmbd_debug(CONN, "Stop session handler %s/%d\n",
070fb21e	446	task->comm, task_pid_nr(task));
f5c779b7	447	ksmbd_conn_set_exiting(conn);
136dff3a	448	if (t->ops->shutdown) {
abcc506a	449	up_read(&conn_list_lock);
136dff3a	450	t->ops->shutdown(t);
abcc506a	451	down_read(&conn_list_lock);
136dff3a	452	}
0626e664	453	}
abcc506a	454	up_read(&conn_list_lock);
0626e664 NJ	455
0626e664 NJ	456	if (!list_empty(&conn_list)) {
64b39f4a	457	schedule_timeout_interruptible(HZ / 10); /* 100ms */
0626e664 NJ	458	goto again;
	459	}
	460	}
	461
	462	void ksmbd_conn_transport_destroy(void)
	463	{
	464	mutex_lock(&init_lock);
	465	ksmbd_tcp_destroy();
	466	ksmbd_rdma_destroy();
	467	stop_sessions();
	468	mutex_unlock(&init_lock);
	469	}