471 lines
11 KiB
C
471 lines
11 KiB
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 */
|
||
|
/* 1 for implied bcc[0] */
|
||
|
size = pdu_size + 4 + 1;
|
||
|
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);
|
||
|
}
|