forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
433 lines
9.7 KiB
433 lines
9.7 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
|
/* |
|
* Copyright (C) 2016 Namjae Jeon <[email protected]> |
|
* 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(); |
|
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); |
|
|
|
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); |
|
|
|
|
|
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: |
|
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); |
|
}
|
|
|