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cifsd: add server handler for central processing and tranport layers

Browse Source 
This adds server handler for central processing,
transport layers(tcp, rdma, ipc) and a document describing cifsd
architecture.

Signed-off-by: Namjae Jeon <namjae.jeon@samsung.com>
Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Signed-off-by: Hyunchul Lee <hyc.lee@gmail.com>
Acked-by: Ronnie Sahlberg <lsahlber@redhat.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
This commit is contained in:
Namjae Jeon 2021-03-16 13:07:11 +09:00 committed by Steve French
parent 6efb943b86
commit 0626e6641f
15 changed files with 5741 additions and 0 deletions
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136
Documentation/filesystems/cifs/cifsd.rst Normal file
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.. SPDX-License-Identifier: GPL-2.0
=========================
CIFSD - SMB3 Kernel Server
=========================
CIFSD is a linux kernel server which implements SMB3 protocol in kernel space
for sharing files over network.
CIFSD architecture
==================
The subset of performance related operations belong in kernelspace and
the other subset which belong to operations which are not really related with
performance in userspace. So, DCE/RPC management that has historically resulted
into number of buffer overflow issues and dangerous security bugs and user
account management are implemented in user space as ksmbd.mountd.
File operations that are related with performance (open/read/write/close etc.)
in kernel space (ksmbd). This also allows for easier integration with VFS
interface for all file operations.
ksmbd (kernel daemon)
---------------------
When the server daemon is started, It starts up a forker thread
(ksmbd/interface name) at initialization time and open a dedicated port 445
for listening to SMB requests. Whenever new clients make request, Forker
thread will accept the client connection and fork a new thread for dedicated
communication channel between the client and the server. It allows for parallel
processing of SMB requests(commands) from clients as well as allowing for new
clients to make new connections. Each instance is named ksmbd/1~n(port number)
to indicate connected clients. Depending on the SMB request types, each new
thread can decide to pass through the commands to the user space (ksmbd.mountd),
currently DCE/RPC commands are identified to be handled through the user space.
To further utilize the linux kernel, it has been chosen to process the commands
as workitems and to be executed in the handlers of the ksmbd-io kworker threads.
It allows for multiplexing of the handlers as the kernel take care of initiating
extra worker threads if the load is increased and vice versa, if the load is
decreased it destroys the extra worker threads. So, after connection is
established with client. Dedicated ksmbd/1..n(port number) takes complete
ownership of receiving/parsing of SMB commands. Each received command is worked
in parallel i.e., There can be multiple clients commands which are worked in
parallel. After receiving each command a separated kernel workitem is prepared
for each command which is further queued to be handled by ksmbd-io kworkers.
So, each SMB workitem is queued to the kworkers. This allows the benefit of load
sharing to be managed optimally by the default kernel and optimizing client
performance by handling client commands in parallel.
ksmbd.mountd (user space daemon)
--------------------------------
ksmbd.mountd is userspace process to, transfer user account and password that
are registered using ksmbd.adduser(part of utils for user space). Further it
allows sharing information parameters that parsed from smb.conf to ksmbd in
kernel. For the execution part it has a daemon which is continuously running
and connected to the kernel interface using netlink socket, it waits for the
requests(dcerpc and share/user info). It handles RPC calls (at a minimum few
dozen) that are most important for file server from NetShareEnum and
NetServerGetInfo. Complete DCE/RPC response is prepared from the user space
and passed over to the associated kernel thread for the client.
Key Features
============
The supported features are:
* SMB3 protocols for basic file sharing
* Auto negotiation
* Compound requests
* Oplock/Lease
* Large MTU
* NTLM/NTLMv2
* HMAC-SHA256 Signing
* Secure negotiate
* Signing Update
* Pre-authentication integrity(SMB 3.1.1)
* SMB3 encryption(CCM, GCM)
* SMB direct(RDMA)
* SMB3.1.1 POSIX extension support
* ACLs
* Kerberos
The features that are planned or not supported:
* SMB3 Multi-channel
* Durable handle v1,v2
* Persistent handles
* Directory lease
* SMB2 notify
How to run
==========
1. Download ksmbd-tools and compile them.
- https://github.com/cifsd-team/ksmbd-tools
2. Create user/password for SMB share.
# mkdir /etc/ksmbd/
# ksmbd.adduser -a <Enter USERNAME for SMB share access>
3. Create /etc/ksmbd/smb.conf file, add SMB share in smb.conf file
- Refer smb.conf.example and Documentation/configuration.txt
in ksmbd-tools
4. Insert ksmbd.ko module
# insmod ksmbd.ko
5. Start ksmbd user space daemon
# ksmbd.mountd
6. Access share from Windows or Linux using CIFS
Shutdown CIFSD
==============
1. kill user and kernel space daemon
# sudo ksmbd.control -s
How to turn debug print on
==========================
Each layer
/sys/class/ksmbd-control/debug
1. Enable all component prints
# sudo ksmbd.control -d "all"
2. Enable one of components(smb, auth, vfs, oplock, ipc, conn, rdma)
# sudo ksmbd.control -d "smb"
3. Show what prints are enable.
# cat/sys/class/ksmbd-control/debug
[smb] auth vfs oplock ipc conn [rdma]
4. Disable prints:
If you try the selected component once more, It is disabled without brackets.

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fs/cifsd/connection.c Normal file
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// 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 "buffer_pool.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;
static LIST_HEAD(conn_list);
static 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);
ksmbd_free_request(conn->request_buf);
ksmbd_ida_free(conn->async_ida);
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);
init_waitqueue_head(&conn->req_running_q);
INIT_LIST_HEAD(&conn->conns_list);
INIT_LIST_HEAD(&conn->sessions);
INIT_LIST_HEAD(&conn->requests);
INIT_LIST_HEAD(&conn->async_requests);
spin_lock_init(&conn->request_lock);
spin_lock_init(&conn->credits_lock);
conn->async_ida = ksmbd_ida_alloc();
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;
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;
struct smb_hdr *rsp_hdr = RESPONSE_BUF(work);
size_t len = 0;
int sent;
struct kvec iov[3];
int iov_idx = 0;
ksmbd_conn_try_dequeue_request(work);
if (!rsp_hdr) {
ksmbd_err("NULL response header\n");
return -EINVAL;
}
if (HAS_TRANSFORM_BUF(work)) {
iov[iov_idx] = (struct kvec) { work->tr_buf,
sizeof(struct smb2_transform_hdr) };
len += iov[iov_idx++].iov_len;
}
if (HAS_AUX_PAYLOAD(work)) {
iov[iov_idx] = (struct kvec) { rsp_hdr, RESP_HDR_SIZE(work) };
len += iov[iov_idx++].iov_len;
iov[iov_idx] = (struct kvec) { AUX_PAYLOAD(work),
AUX_PAYLOAD_SIZE(work) };
len += iov[iov_idx++].iov_len;
} else {
if (HAS_TRANSFORM_BUF(work))
iov[iov_idx].iov_len = RESP_HDR_SIZE(work);
else
iov[iov_idx].iov_len = get_rfc1002_len(rsp_hdr) + 4;
iov[iov_idx].iov_base = rsp_hdr;
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) {
ksmbd_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,
u32 remote_key, u64 remote_offset,
u32 remote_len)
{
int ret = -EINVAL;
if (conn->transport->ops->rdma_read)
ret = conn->transport->ops->rdma_read(conn->transport,
buf, buflen,
remote_key, remote_offset,
remote_len);
return ret;
}
int ksmbd_conn_rdma_write(struct ksmbd_conn *conn,
void *buf, unsigned int buflen,
u32 remote_key, u64 remote_offset,
u32 remote_len)
{
int ret = -EINVAL;
if (conn->transport->ops->rdma_write)
ret = conn->transport->ops->rdma_write(conn->transport,
buf, buflen,
remote_key, remote_offset,
remote_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 openning 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;
ksmbd_free_request(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);
/* make sure we have enough to get to SMB header end */
if (!ksmbd_pdu_size_has_room(pdu_size)) {
ksmbd_debug(CONN, "SMB request too short (%u bytes)\n",
pdu_size);
continue;
}
/* 4 for rfc1002 length field */
size = pdu_size + 4;
conn->request_buf = ksmbd_alloc_request(size);
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) {
ksmbd_err("sock_read failed: %d\n", size);
break;
}
if (size != pdu_size) {
ksmbd_err("PDU error. Read: %d, Expected: %d\n",
size,
pdu_size);
continue;
}
if (!default_conn_ops.process_fn) {
ksmbd_err("No connection request callback\n");
break;
}
if (default_conn_ops.process_fn(conn)) {
ksmbd_err("Cannot handle request\n");
break;
}
}
out:
/* Wait till all reference dropped to the Server object*/
while (atomic_read(&conn->r_count) > 0)
schedule_timeout(HZ);
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 KSMBD subsystem: %d\n", ret);
goto out;
}
out:
mutex_unlock(&init_lock);
return ret;
}
static void stop_sessions(void)
{
struct ksmbd_conn *conn;
again:
read_lock(&conn_list_lock);
list_for_each_entry(conn, &conn_list, conns_list) {
struct task_struct *task;
task = conn->transport->handler;
if (task)
ksmbd_debug(CONN, "Stop session handler %s/%d\n",
task->comm,
task_pid_nr(task));
conn->status = KSMBD_SESS_EXITING;
}
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);
}

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fs/cifsd/connection.h Normal file
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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* Copyright (C) 2018 Samsung Electronics Co., Ltd.
*/
#ifndef __KSMBD_CONNECTION_H__
#define __KSMBD_CONNECTION_H__
#include <linux/list.h>
#include <linux/ip.h>
#include <net/sock.h>
#include <net/tcp.h>
#include <net/inet_connection_sock.h>
#include <net/request_sock.h>
#include <linux/kthread.h>
#include <linux/nls.h>
#include "smb_common.h"
#include "ksmbd_work.h"
#define KSMBD_SOCKET_BACKLOG 16
/*
* WARNING
*
* This is nothing but a HACK. Session status should move to channel
* or to session. As of now we have 1 tcp_conn : 1 ksmbd_session, but
* we need to change it to 1 tcp_conn : N ksmbd_sessions.
*/
enum {
KSMBD_SESS_NEW = 0,
KSMBD_SESS_GOOD,
KSMBD_SESS_EXITING,
KSMBD_SESS_NEED_RECONNECT,
KSMBD_SESS_NEED_NEGOTIATE
};
struct ksmbd_stats {
atomic_t open_files_count;
atomic64_t request_served;
};
struct ksmbd_transport;
struct ksmbd_conn {
struct smb_version_values *vals;
struct smb_version_ops *ops;
struct smb_version_cmds *cmds;
unsigned int max_cmds;
struct mutex srv_mutex;
int status;
unsigned int cli_cap;
char *request_buf;
struct ksmbd_transport *transport;
struct nls_table *local_nls;
struct list_head conns_list;
/* smb session 1 per user */
struct list_head sessions;
unsigned long last_active;
/* How many request are running currently */
atomic_t req_running;
/* References which are made for this Server object*/
atomic_t r_count;
unsigned short total_credits;
unsigned short max_credits;
spinlock_t credits_lock;
wait_queue_head_t req_running_q;
/* Lock to protect requests list*/
spinlock_t request_lock;
struct list_head requests;
struct list_head async_requests;
int connection_type;
struct ksmbd_stats stats;
char ClientGUID[SMB2_CLIENT_GUID_SIZE];
union {
/* pending trans request table */
struct trans_state *recent_trans;
/* Used by ntlmssp */
char *ntlmssp_cryptkey;
};
struct preauth_integrity_info *preauth_info;
bool need_neg;
unsigned int auth_mechs;
unsigned int preferred_auth_mech;
bool sign;
bool use_spnego:1;
__u16 cli_sec_mode;
__u16 srv_sec_mode;
/* dialect index that server chose */
__u16 dialect;
char *mechToken;
struct ksmbd_conn_ops *conn_ops;
/* Preauth Session Table */
struct list_head preauth_sess_table;
struct sockaddr_storage peer_addr;
/* Identifier for async message */
struct ksmbd_ida *async_ida;
__le16 cipher_type;
__le16 compress_algorithm;
bool posix_ext_supported;
};
struct ksmbd_conn_ops {
int (*process_fn)(struct ksmbd_conn *conn);
int (*terminate_fn)(struct ksmbd_conn *conn);
};
struct ksmbd_transport_ops {
int (*prepare)(struct ksmbd_transport *t);
void (*disconnect)(struct ksmbd_transport *t);
int (*read)(struct ksmbd_transport *t,
char *buf, unsigned int size);
int (*writev)(struct ksmbd_transport *t,
struct kvec *iovs, int niov, int size,
bool need_invalidate_rkey, unsigned int remote_key);
int (*rdma_read)(struct ksmbd_transport *t,
void *buf, unsigned int len, u32 remote_key,
u64 remote_offset, u32 remote_len);
int (*rdma_write)(struct ksmbd_transport *t,
void *buf, unsigned int len, u32 remote_key,
u64 remote_offset, u32 remote_len);
};
struct ksmbd_transport {
struct ksmbd_conn *conn;
struct ksmbd_transport_ops *ops;
struct task_struct *handler;
};
#define KSMBD_TCP_RECV_TIMEOUT (7 * HZ)
#define KSMBD_TCP_SEND_TIMEOUT (5 * HZ)
#define KSMBD_TCP_PEER_SOCKADDR(c) ((struct sockaddr *)&((c)->peer_addr))
bool ksmbd_conn_alive(struct ksmbd_conn *conn);
void ksmbd_conn_wait_idle(struct ksmbd_conn *conn);
struct ksmbd_conn *ksmbd_conn_alloc(void);
void ksmbd_conn_free(struct ksmbd_conn *conn);
bool ksmbd_conn_lookup_dialect(struct ksmbd_conn *c);
int ksmbd_conn_write(struct ksmbd_work *work);
int ksmbd_conn_rdma_read(struct ksmbd_conn *conn,
void *buf, unsigned int buflen,
u32 remote_key, u64 remote_offset,
u32 remote_len);
int ksmbd_conn_rdma_write(struct ksmbd_conn *conn,
void *buf, unsigned int buflen,
u32 remote_key, u64 remote_offset,
u32 remote_len);
void ksmbd_conn_enqueue_request(struct ksmbd_work *work);
int ksmbd_conn_try_dequeue_request(struct ksmbd_work *work);
void ksmbd_conn_init_server_callbacks(struct ksmbd_conn_ops *ops);
int ksmbd_conn_handler_loop(void *p);
int ksmbd_conn_transport_init(void);
void ksmbd_conn_transport_destroy(void);
/*
* WARNING
*
* This is a hack. We will move status to a proper place once we land
* a multi-sessions support.
*/
static inline bool ksmbd_conn_good(struct ksmbd_work *work)
{
return work->conn->status == KSMBD_SESS_GOOD;
}
static inline bool ksmbd_conn_need_negotiate(struct ksmbd_work *work)
{
return work->conn->status == KSMBD_SESS_NEED_NEGOTIATE;
}
static inline bool ksmbd_conn_need_reconnect(struct ksmbd_work *work)
{
return work->conn->status == KSMBD_SESS_NEED_RECONNECT;
}
static inline bool ksmbd_conn_exiting(struct ksmbd_work *work)
{
return work->conn->status == KSMBD_SESS_EXITING;
}
static inline void ksmbd_conn_set_good(struct ksmbd_work *work)
{
work->conn->status = KSMBD_SESS_GOOD;
}
static inline void ksmbd_conn_set_need_negotiate(struct ksmbd_work *work)
{
work->conn->status = KSMBD_SESS_NEED_NEGOTIATE;
}
static inline void ksmbd_conn_set_need_reconnect(struct ksmbd_work *work)
{
work->conn->status = KSMBD_SESS_NEED_RECONNECT;
}
static inline void ksmbd_conn_set_exiting(struct ksmbd_work *work)
{
work->conn->status = KSMBD_SESS_EXITING;
}
#endif /* __CONNECTION_H__ */

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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* Copyright (C) 2016 Namjae Jeon <linkinjeon@kernel.org>
* Copyright (C) 2018 Samsung Electronics Co., Ltd.
*/
#ifndef __KSMBD_GLOB_H
#define __KSMBD_GLOB_H
#include <linux/ctype.h>
#include <linux/version.h>
#include "unicode.h"
#include "vfs_cache.h"
#include "smberr.h"
#define KSMBD_VERSION "3.1.9"
/* @FIXME clean up this code */
extern int ksmbd_debug_types;
extern int ksmbd_caseless_search;
#define DATA_STREAM 1
#define DIR_STREAM 2
#define KSMBD_DEBUG_SMB (1 << 0)
#define KSMBD_DEBUG_AUTH (1 << 1)
#define KSMBD_DEBUG_VFS (1 << 2)
#define KSMBD_DEBUG_OPLOCK (1 << 3)
#define KSMBD_DEBUG_IPC (1 << 4)
#define KSMBD_DEBUG_CONN (1 << 5)
#define KSMBD_DEBUG_RDMA (1 << 6)
#define KSMBD_DEBUG_ALL (KSMBD_DEBUG_SMB | KSMBD_DEBUG_AUTH | \
KSMBD_DEBUG_VFS | KSMBD_DEBUG_OPLOCK | \
KSMBD_DEBUG_IPC | KSMBD_DEBUG_CONN | \
KSMBD_DEBUG_RDMA)
#ifndef ksmbd_pr_fmt
#ifdef SUBMOD_NAME
#define ksmbd_pr_fmt(fmt) "ksmbd: " SUBMOD_NAME ": " fmt
#else
#define ksmbd_pr_fmt(fmt) "ksmbd: " fmt
#endif
#endif
#define ksmbd_debug(type, fmt, ...) \
do { \
if (ksmbd_debug_types & KSMBD_DEBUG_##type) \
pr_info(ksmbd_pr_fmt("%s:%d: " fmt), \
__func__, \
__LINE__, \
##__VA_ARGS__); \
} while (0)
#define ksmbd_info(fmt, ...) \
pr_info(ksmbd_pr_fmt(fmt), ##__VA_ARGS__)
#define ksmbd_err(fmt, ...) \
pr_err(ksmbd_pr_fmt("%s:%d: " fmt), \
__func__, \
__LINE__, \
##__VA_ARGS__)
#define UNICODE_LEN(x) ((x) * 2)
#endif /* __KSMBD_GLOB_H */

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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* Copyright (C) 2018 Samsung Electronics Co., Ltd.
*
* linux-ksmbd-devel@lists.sourceforge.net
*/
#ifndef _LINUX_KSMBD_SERVER_H
#define _LINUX_KSMBD_SERVER_H
#include <linux/types.h>
#define KSMBD_GENL_NAME "SMBD_GENL"
#define KSMBD_GENL_VERSION 0x01
#ifndef ____ksmbd_align
#define ____ksmbd_align __aligned(4)
#endif
#define KSMBD_REQ_MAX_ACCOUNT_NAME_SZ 48
#define KSMBD_REQ_MAX_HASH_SZ 18
#define KSMBD_REQ_MAX_SHARE_NAME 64
struct ksmbd_heartbeat {
__u32 handle;
};
/*
* Global config flags.
*/
#define KSMBD_GLOBAL_FLAG_INVALID (0)
#define KSMBD_GLOBAL_FLAG_SMB2_LEASES (1 << 0)
#define KSMBD_GLOBAL_FLAG_CACHE_TBUF (1 << 1)
#define KSMBD_GLOBAL_FLAG_CACHE_RBUF (1 << 2)
#define KSMBD_GLOBAL_FLAG_SMB2_ENCRYPTION (1 << 3)
#define KSMBD_GLOBAL_FLAG_DURABLE_HANDLE (1 << 4)
struct ksmbd_startup_request {
__u32 flags;
__s32 signing;
__s8 min_prot[16];
__s8 max_prot[16];
__s8 netbios_name[16];
__s8 work_group[64];
__s8 server_string[64];
__u16 tcp_port;
__u16 ipc_timeout;
__u32 deadtime;
__u32 file_max;
__u32 smb2_max_write;
__u32 smb2_max_read;
__u32 smb2_max_trans;
__u32 share_fake_fscaps;
__u32 sub_auth[3];
__u32 ifc_list_sz;
__s8 ____payload[0];
} ____ksmbd_align;
#define KSMBD_STARTUP_CONFIG_INTERFACES(s) ((s)->____payload)
struct ksmbd_shutdown_request {
__s32 reserved;
} ____ksmbd_align;
struct ksmbd_login_request {
__u32 handle;
__s8 account[KSMBD_REQ_MAX_ACCOUNT_NAME_SZ];
} ____ksmbd_align;
struct ksmbd_login_response {
__u32 handle;
__u32 gid;
__u32 uid;
__s8 account[KSMBD_REQ_MAX_ACCOUNT_NAME_SZ];
__u16 status;
__u16 hash_sz;
__s8 hash[KSMBD_REQ_MAX_HASH_SZ];
} ____ksmbd_align;
struct ksmbd_share_config_request {
__u32 handle;
__s8 share_name[KSMBD_REQ_MAX_SHARE_NAME];
} ____ksmbd_align;
struct ksmbd_share_config_response {
__u32 handle;
__u32 flags;
__u16 create_mask;
__u16 directory_mask;
__u16 force_create_mode;
__u16 force_directory_mode;
__u16 force_uid;
__u16 force_gid;
__u32 veto_list_sz;
__s8 ____payload[0];
} ____ksmbd_align;
#define KSMBD_SHARE_CONFIG_VETO_LIST(s) ((s)->____payload)
#define KSMBD_SHARE_CONFIG_PATH(s) \
({ \
char *p = (s)->____payload; \
if ((s)->veto_list_sz) \
p += (s)->veto_list_sz + 1; \
p; \
})
struct ksmbd_tree_connect_request {
__u32 handle;
__u16 account_flags;
__u16 flags;
__u64 session_id;
__u64 connect_id;
__s8 account[KSMBD_REQ_MAX_ACCOUNT_NAME_SZ];
__s8 share[KSMBD_REQ_MAX_SHARE_NAME];
__s8 peer_addr[64];
} ____ksmbd_align;
struct ksmbd_tree_connect_response {
__u32 handle;
__u16 status;
__u16 connection_flags;
} ____ksmbd_align;
struct ksmbd_tree_disconnect_request {
__u64 session_id;
__u64 connect_id;
} ____ksmbd_align;
struct ksmbd_logout_request {
__s8 account[KSMBD_REQ_MAX_ACCOUNT_NAME_SZ];
} ____ksmbd_align;
struct ksmbd_rpc_command {
__u32 handle;
__u32 flags;
__u32 payload_sz;
__u8 payload[0];
} ____ksmbd_align;
struct ksmbd_spnego_authen_request {
__u32 handle;
__u16 spnego_blob_len;
__u8 spnego_blob[0];
} ____ksmbd_align;
struct ksmbd_spnego_authen_response {
__u32 handle;
struct ksmbd_login_response login_response;
__u16 session_key_len;
__u16 spnego_blob_len;
__u8 payload[0]; /* session key + AP_REP */
} ____ksmbd_align;
/*
* This also used as NETLINK attribute type value.
*
* NOTE:
* Response message type value should be equal to
* request message type value + 1.
*/
enum ksmbd_event {
KSMBD_EVENT_UNSPEC = 0,
KSMBD_EVENT_HEARTBEAT_REQUEST,
KSMBD_EVENT_STARTING_UP,
KSMBD_EVENT_SHUTTING_DOWN,
KSMBD_EVENT_LOGIN_REQUEST,
KSMBD_EVENT_LOGIN_RESPONSE = 5,
KSMBD_EVENT_SHARE_CONFIG_REQUEST,
KSMBD_EVENT_SHARE_CONFIG_RESPONSE,
KSMBD_EVENT_TREE_CONNECT_REQUEST,
KSMBD_EVENT_TREE_CONNECT_RESPONSE,
KSMBD_EVENT_TREE_DISCONNECT_REQUEST = 10,
KSMBD_EVENT_LOGOUT_REQUEST,
KSMBD_EVENT_RPC_REQUEST,
KSMBD_EVENT_RPC_RESPONSE,
KSMBD_EVENT_SPNEGO_AUTHEN_REQUEST,
KSMBD_EVENT_SPNEGO_AUTHEN_RESPONSE = 15,
KSMBD_EVENT_MAX
};
enum KSMBD_TREE_CONN_STATUS {
KSMBD_TREE_CONN_STATUS_OK = 0,
KSMBD_TREE_CONN_STATUS_NOMEM,
KSMBD_TREE_CONN_STATUS_NO_SHARE,
KSMBD_TREE_CONN_STATUS_NO_USER,
KSMBD_TREE_CONN_STATUS_INVALID_USER,
KSMBD_TREE_CONN_STATUS_HOST_DENIED = 5,
KSMBD_TREE_CONN_STATUS_CONN_EXIST,
KSMBD_TREE_CONN_STATUS_TOO_MANY_CONNS,
KSMBD_TREE_CONN_STATUS_TOO_MANY_SESSIONS,
KSMBD_TREE_CONN_STATUS_ERROR,
};
/*
* User config flags.
*/
#define KSMBD_USER_FLAG_INVALID (0)
#define KSMBD_USER_FLAG_OK (1 << 0)
#define KSMBD_USER_FLAG_BAD_PASSWORD (1 << 1)
#define KSMBD_USER_FLAG_BAD_UID (1 << 2)
#define KSMBD_USER_FLAG_BAD_USER (1 << 3)
#define KSMBD_USER_FLAG_GUEST_ACCOUNT (1 << 4)
/*
* Share config flags.
*/
#define KSMBD_SHARE_FLAG_INVALID (0)
#define KSMBD_SHARE_FLAG_AVAILABLE (1 << 0)
#define KSMBD_SHARE_FLAG_BROWSEABLE (1 << 1)
#define KSMBD_SHARE_FLAG_WRITEABLE (1 << 2)
#define KSMBD_SHARE_FLAG_READONLY (1 << 3)
#define KSMBD_SHARE_FLAG_GUEST_OK (1 << 4)
#define KSMBD_SHARE_FLAG_GUEST_ONLY (1 << 5)
#define KSMBD_SHARE_FLAG_STORE_DOS_ATTRS (1 << 6)
#define KSMBD_SHARE_FLAG_OPLOCKS (1 << 7)
#define KSMBD_SHARE_FLAG_PIPE (1 << 8)
#define KSMBD_SHARE_FLAG_HIDE_DOT_FILES (1 << 9)
#define KSMBD_SHARE_FLAG_INHERIT_SMACK (1 << 10)
#define KSMBD_SHARE_FLAG_INHERIT_OWNER (1 << 11)
#define KSMBD_SHARE_FLAG_STREAMS (1 << 12)
#define KSMBD_SHARE_FLAG_FOLLOW_SYMLINKS (1 << 13)
#define KSMBD_SHARE_FLAG_ACL_XATTR (1 << 14)
/*
* Tree connect request flags.
*/
#define KSMBD_TREE_CONN_FLAG_REQUEST_SMB1 (0)
#define KSMBD_TREE_CONN_FLAG_REQUEST_IPV6 (1 << 0)
#define KSMBD_TREE_CONN_FLAG_REQUEST_SMB2 (1 << 1)
/*
* Tree connect flags.
*/
#define KSMBD_TREE_CONN_FLAG_GUEST_ACCOUNT (1 << 0)
#define KSMBD_TREE_CONN_FLAG_READ_ONLY (1 << 1)
#define KSMBD_TREE_CONN_FLAG_WRITABLE (1 << 2)
#define KSMBD_TREE_CONN_FLAG_ADMIN_ACCOUNT (1 << 3)
/*
* RPC over IPC.
*/
#define KSMBD_RPC_METHOD_RETURN (1 << 0)
#define KSMBD_RPC_SRVSVC_METHOD_INVOKE (1 << 1)
#define KSMBD_RPC_SRVSVC_METHOD_RETURN ((1 << 1) | KSMBD_RPC_METHOD_RETURN)
#define KSMBD_RPC_WKSSVC_METHOD_INVOKE (1 << 2)
#define KSMBD_RPC_WKSSVC_METHOD_RETURN ((1 << 2) | KSMBD_RPC_METHOD_RETURN)
#define KSMBD_RPC_IOCTL_METHOD ((1 << 3) | KSMBD_RPC_METHOD_RETURN)
#define KSMBD_RPC_OPEN_METHOD (1 << 4)
#define KSMBD_RPC_WRITE_METHOD (1 << 5)
#define KSMBD_RPC_READ_METHOD ((1 << 6) | KSMBD_RPC_METHOD_RETURN)
#define KSMBD_RPC_CLOSE_METHOD (1 << 7)
#define KSMBD_RPC_RAP_METHOD ((1 << 8) | KSMBD_RPC_METHOD_RETURN)
#define KSMBD_RPC_RESTRICTED_CONTEXT (1 << 9)
#define KSMBD_RPC_SAMR_METHOD_INVOKE (1 << 10)
#define KSMBD_RPC_SAMR_METHOD_RETURN ((1 << 10) | KSMBD_RPC_METHOD_RETURN)
#define KSMBD_RPC_LSARPC_METHOD_INVOKE (1 << 11)
#define KSMBD_RPC_LSARPC_METHOD_RETURN ((1 << 11) | KSMBD_RPC_METHOD_RETURN)
#define KSMBD_RPC_OK 0
#define KSMBD_RPC_EBAD_FUNC 0x00000001
#define KSMBD_RPC_EACCESS_DENIED 0x00000005
#define KSMBD_RPC_EBAD_FID 0x00000006
#define KSMBD_RPC_ENOMEM 0x00000008
#define KSMBD_RPC_EBAD_DATA 0x0000000D
#define KSMBD_RPC_ENOTIMPLEMENTED 0x00000040
#define KSMBD_RPC_EINVALID_PARAMETER 0x00000057
#define KSMBD_RPC_EMORE_DATA 0x000000EA
#define KSMBD_RPC_EINVALID_LEVEL 0x0000007C
#define KSMBD_RPC_SOME_NOT_MAPPED 0x00000107
#define KSMBD_CONFIG_OPT_DISABLED 0
#define KSMBD_CONFIG_OPT_ENABLED 1
#define KSMBD_CONFIG_OPT_AUTO 2
#define KSMBD_CONFIG_OPT_MANDATORY 3
#endif /* _LINUX_KSMBD_SERVER_H */

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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (C) 2019 Samsung Electronics Co., Ltd.
*/
#include <linux/list.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/workqueue.h>
#include "server.h"
#include "connection.h"
#include "ksmbd_work.h"
#include "buffer_pool.h"
#include "mgmt/ksmbd_ida.h"
/* @FIXME */
#include "ksmbd_server.h"
static struct kmem_cache *work_cache;
static struct workqueue_struct *ksmbd_wq;
struct ksmbd_work *ksmbd_alloc_work_struct(void)
{
struct ksmbd_work *work = kmem_cache_zalloc(work_cache, GFP_KERNEL);
if (work) {
work->compound_fid = KSMBD_NO_FID;
work->compound_pfid = KSMBD_NO_FID;
INIT_LIST_HEAD(&work->request_entry);
INIT_LIST_HEAD(&work->async_request_entry);
INIT_LIST_HEAD(&work->fp_entry);
INIT_LIST_HEAD(&work->interim_entry);
}
return work;
}
void ksmbd_free_work_struct(struct ksmbd_work *work)
{
WARN_ON(work->saved_cred != NULL);
if (server_conf.flags & KSMBD_GLOBAL_FLAG_CACHE_TBUF &&
work->set_trans_buf)
ksmbd_release_buffer(RESPONSE_BUF(work));
else
ksmbd_free_response(RESPONSE_BUF(work));
if (server_conf.flags & KSMBD_GLOBAL_FLAG_CACHE_RBUF &&
work->set_read_buf)
ksmbd_release_buffer(AUX_PAYLOAD(work));
else
ksmbd_free_response(AUX_PAYLOAD(work));
ksmbd_free_response(TRANSFORM_BUF(work));
ksmbd_free_request(REQUEST_BUF(work));
if (work->async_id)
ksmbd_release_id(work->conn->async_ida, work->async_id);
kmem_cache_free(work_cache, work);
}
void ksmbd_work_pool_destroy(void)
{
kmem_cache_destroy(work_cache);
}
int ksmbd_work_pool_init(void)
{
work_cache = kmem_cache_create("ksmbd_work_cache",
sizeof(struct ksmbd_work), 0,
SLAB_HWCACHE_ALIGN, NULL);
if (!work_cache)
return -ENOMEM;
return 0;
}
int ksmbd_workqueue_init(void)
{
ksmbd_wq = alloc_workqueue("ksmbd-io", 0, 0);
if (!ksmbd_wq)
return -ENOMEM;
return 0;
}
void ksmbd_workqueue_destroy(void)
{
flush_workqueue(ksmbd_wq);
destroy_workqueue(ksmbd_wq);
ksmbd_wq = NULL;
}
bool ksmbd_queue_work(struct ksmbd_work *work)
{
return queue_work(ksmbd_wq, &work->work);
}

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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* Copyright (C) 2019 Samsung Electronics Co., Ltd.
*/
#ifndef __KSMBD_WORK_H__
#define __KSMBD_WORK_H__
#include <linux/ctype.h>
#include <linux/workqueue.h>
struct ksmbd_conn;
struct ksmbd_session;
struct ksmbd_tree_connect;
enum {
KSMBD_WORK_ACTIVE = 0,
KSMBD_WORK_CANCELLED,
KSMBD_WORK_CLOSED,
};
/* one of these for every pending CIFS request at the connection */
struct ksmbd_work {
/* Server corresponding to this mid */
struct ksmbd_conn *conn;
struct ksmbd_session *sess;
struct ksmbd_tree_connect *tcon;
/* Pointer to received SMB header */
char *request_buf;
/* Response buffer */
char *response_buf;
/* Read data buffer */
char *aux_payload_buf;
/* Next cmd hdr in compound req buf*/
int next_smb2_rcv_hdr_off;
/* Next cmd hdr in compound rsp buf*/
int next_smb2_rsp_hdr_off;
/*
* Current Local FID assigned compound response if SMB2 CREATE
* command is present in compound request
*/
unsigned int compound_fid;
unsigned int compound_pfid;
unsigned int compound_sid;
const struct cred *saved_cred;
/* Number of granted credits */
unsigned int credits_granted;
/* response smb header size */
unsigned int resp_hdr_sz;
unsigned int response_sz;
/* Read data count */
unsigned int aux_payload_sz;
void *tr_buf;
unsigned char state;
/* Multiple responses for one request e.g. SMB ECHO */
bool multiRsp:1;
/* No response for cancelled request */
bool send_no_response:1;
/* Request is encrypted */
bool encrypted:1;
/* Is this SYNC or ASYNC ksmbd_work */
bool syncronous:1;
bool need_invalidate_rkey:1;
bool set_trans_buf:1;
bool set_read_buf:1;
unsigned int remote_key;
/* cancel works */
int async_id;
void **cancel_argv;
void (*cancel_fn)(void **argv);
struct work_struct work;
/* List head at conn->requests */
struct list_head request_entry;
/* List head at conn->async_requests */
struct list_head async_request_entry;
struct list_head fp_entry;
struct list_head interim_entry;
};
#define WORK_CANCELLED(w) ((w)->state == KSMBD_WORK_CANCELLED)
#define WORK_CLOSED(w) ((w)->state == KSMBD_WORK_CLOSED)
#define WORK_ACTIVE(w) ((w)->state == KSMBD_WORK_ACTIVE)
#define RESPONSE_BUF(w) ((void *)(w)->response_buf)
#define REQUEST_BUF(w) ((void *)(w)->request_buf)
#define RESPONSE_BUF_NEXT(w) \
((void *)((w)->response_buf + (w)->next_smb2_rsp_hdr_off))
#define REQUEST_BUF_NEXT(w) \
((void *)((w)->request_buf + (w)->next_smb2_rcv_hdr_off))
#define RESPONSE_SZ(w) ((w)->response_sz)
#define INIT_AUX_PAYLOAD(w) ((w)->aux_payload_buf = NULL)
#define HAS_AUX_PAYLOAD(w) ((w)->aux_payload_sz != 0)
#define AUX_PAYLOAD(w) ((void *)((w)->aux_payload_buf))
#define AUX_PAYLOAD_SIZE(w) ((w)->aux_payload_sz)
#define RESP_HDR_SIZE(w) ((w)->resp_hdr_sz)
#define HAS_TRANSFORM_BUF(w) ((w)->tr_buf != NULL)
#define TRANSFORM_BUF(w) ((void *)((w)->tr_buf))
struct ksmbd_work *ksmbd_alloc_work_struct(void);
void ksmbd_free_work_struct(struct ksmbd_work *work);
void ksmbd_work_pool_destroy(void);
int ksmbd_work_pool_init(void);
int ksmbd_workqueue_init(void);
void ksmbd_workqueue_destroy(void);
bool ksmbd_queue_work(struct ksmbd_work *work);
#endif /* __KSMBD_WORK_H__ */

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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (C) 2016 Namjae Jeon <linkinjeon@kernel.org>
* Copyright (C) 2018 Samsung Electronics Co., Ltd.
*/
#include "glob.h"
#include "oplock.h"
#include "misc.h"
#include <linux/sched/signal.h>
#include <linux/workqueue.h>
#include <linux/sysfs.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include "server.h"
#include "smb_common.h"
#include "smbstatus.h"
#include "buffer_pool.h"
#include "connection.h"
#include "transport_ipc.h"
#include "mgmt/user_session.h"
#include "crypto_ctx.h"
#include "auth.h"
int ksmbd_debug_types;
struct ksmbd_server_config server_conf;
enum SERVER_CTRL_TYPE {
SERVER_CTRL_TYPE_INIT,
SERVER_CTRL_TYPE_RESET,
};
struct server_ctrl_struct {
int type;
struct work_struct ctrl_work;
};
static DEFINE_MUTEX(ctrl_lock);
static int ___server_conf_set(int idx, char *val)
{
if (idx >= ARRAY_SIZE(server_conf.conf))
return -EINVAL;
if (!val || val[0] == 0x00)
return -EINVAL;
kfree(server_conf.conf[idx]);
server_conf.conf[idx] = kstrdup(val, GFP_KERNEL);
if (!server_conf.conf[idx])
return -ENOMEM;
return 0;
}
int ksmbd_set_netbios_name(char *v)
{
return ___server_conf_set(SERVER_CONF_NETBIOS_NAME, v);
}
int ksmbd_set_server_string(char *v)
{
return ___server_conf_set(SERVER_CONF_SERVER_STRING, v);
}
int ksmbd_set_work_group(char *v)
{
return ___server_conf_set(SERVER_CONF_WORK_GROUP, v);
}
char *ksmbd_netbios_name(void)
{
return server_conf.conf[SERVER_CONF_NETBIOS_NAME];
}
char *ksmbd_server_string(void)
{
return server_conf.conf[SERVER_CONF_SERVER_STRING];
}
char *ksmbd_work_group(void)
{
return server_conf.conf[SERVER_CONF_WORK_GROUP];
}
/**
* check_conn_state() - check state of server thread connection
* @ksmbd_work: smb work containing server thread information
*
* Return: 0 on valid connection, otherwise 1 to reconnect
*/
static inline int check_conn_state(struct ksmbd_work *work)
{
struct smb_hdr *rsp_hdr;
if (ksmbd_conn_exiting(work) || ksmbd_conn_need_reconnect(work)) {
rsp_hdr = RESPONSE_BUF(work);
rsp_hdr->Status.CifsError = STATUS_CONNECTION_DISCONNECTED;
return 1;
}
return 0;
}
/* @FIXME what a mess... god help. */
#define TCP_HANDLER_CONTINUE 0
#define TCP_HANDLER_ABORT 1
static int __process_request(struct ksmbd_work *work,
struct ksmbd_conn *conn,
uint16_t *cmd)
{
struct smb_version_cmds *cmds;
uint16_t command;
int ret;
if (check_conn_state(work))
return TCP_HANDLER_CONTINUE;
if (ksmbd_verify_smb_message(work))
return TCP_HANDLER_ABORT;
command = conn->ops->get_cmd_val(work);
*cmd = command;
andx_again:
if (command >= conn->max_cmds) {
conn->ops->set_rsp_status(work, STATUS_INVALID_PARAMETER);
return TCP_HANDLER_CONTINUE;
}
cmds = &conn->cmds[command];
if (!cmds->proc) {
ksmbd_debug(SMB, "*** not implemented yet cmd = %x\n", command);
conn->ops->set_rsp_status(work, STATUS_NOT_IMPLEMENTED);
return TCP_HANDLER_CONTINUE;
}
if (work->sess && conn->ops->is_sign_req(work, command)) {
ret = conn->ops->check_sign_req(work);
if (!ret) {
conn->ops->set_rsp_status(work, STATUS_ACCESS_DENIED);
return TCP_HANDLER_CONTINUE;
}
}
ret = cmds->proc(work);
if (ret < 0)
ksmbd_debug(CONN, "Failed to process %u [%d]\n", command, ret);
/* AndX commands - chained request can return positive values */
else if (ret > 0) {
command = ret;
*cmd = command;
goto andx_again;
}
if (work->send_no_response)
return TCP_HANDLER_ABORT;
return TCP_HANDLER_CONTINUE;
}
static void __handle_ksmbd_work(struct ksmbd_work *work,
struct ksmbd_conn *conn)
{
uint16_t command = 0;
int rc;
if (conn->ops->allocate_rsp_buf(work))
return;
if (conn->ops->is_transform_hdr &&
conn->ops->is_transform_hdr(REQUEST_BUF(work))) {
rc = conn->ops->decrypt_req(work);
if (rc < 0) {
conn->ops->set_rsp_status(work, STATUS_DATA_ERROR);
goto send;
}
work->encrypted = true;
}
rc = conn->ops->init_rsp_hdr(work);
if (rc) {
/* either uid or tid is not correct */
conn->ops->set_rsp_status(work, STATUS_INVALID_HANDLE);
goto send;
}
if (conn->ops->check_user_session) {
rc = conn->ops->check_user_session(work);
if (rc < 0) {
command = conn->ops->get_cmd_val(work);
conn->ops->set_rsp_status(work,
STATUS_USER_SESSION_DELETED);
goto send;
} else if (rc > 0) {
rc = conn->ops->get_ksmbd_tcon(work);
if (rc < 0) {
conn->ops->set_rsp_status(work,
STATUS_NETWORK_NAME_DELETED);
goto send;
}
}
}
do {
rc = __process_request(work, conn, &command);
if (rc == TCP_HANDLER_ABORT)
break;
/*
* Call smb2_set_rsp_credits() function to set number of credits
* granted in hdr of smb2 response.
*/
if (conn->ops->set_rsp_credits) {
spin_lock(&conn->credits_lock);
rc = conn->ops->set_rsp_credits(work);
spin_unlock(&conn->credits_lock);
if (rc < 0) {
conn->ops->set_rsp_status(work,
STATUS_INVALID_PARAMETER);
goto send;
}
}
if (work->sess && (work->sess->sign ||
smb3_11_final_sess_setup_resp(work) ||
conn->ops->is_sign_req(work, command)))
conn->ops->set_sign_rsp(work);
} while (is_chained_smb2_message(work));
if (work->send_no_response)
return;
send:
smb3_preauth_hash_rsp(work);
if (work->sess && work->sess->enc && work->encrypted &&
conn->ops->encrypt_resp) {
rc = conn->ops->encrypt_resp(work);
if (rc < 0) {
conn->ops->set_rsp_status(work, STATUS_DATA_ERROR);
goto send;
}
}
ksmbd_conn_write(work);
}
/**
* handle_ksmbd_work() - process pending smb work requests
* @ksmbd_work: smb work containing request command buffer
*
* called by kworker threads to processing remaining smb work requests
*/
static void handle_ksmbd_work(struct work_struct *wk)
{
struct ksmbd_work *work = container_of(wk, struct ksmbd_work, work);
struct ksmbd_conn *conn = work->conn;
atomic64_inc(&conn->stats.request_served);
__handle_ksmbd_work(work, conn);
ksmbd_conn_try_dequeue_request(work);
ksmbd_free_work_struct(work);
atomic_dec(&conn->r_count);
}
/**
* queue_ksmbd_work() - queue a smb request to worker thread queue
* for proccessing smb command and sending response
* @conn: connection instance
*
* read remaining data from socket create and submit work.
*/
static int queue_ksmbd_work(struct ksmbd_conn *conn)
{
struct ksmbd_work *work;
work = ksmbd_alloc_work_struct();
if (!work) {
ksmbd_err("allocation for work failed\n");
return -ENOMEM;
}
work->conn = conn;
work->request_buf = conn->request_buf;
conn->request_buf = NULL;
if (ksmbd_init_smb_server(work)) {
ksmbd_free_work_struct(work);
return -EINVAL;
}
ksmbd_conn_enqueue_request(work);
atomic_inc(&conn->r_count);
/* update activity on connection */
conn->last_active = jiffies;
INIT_WORK(&work->work, handle_ksmbd_work);
ksmbd_queue_work(work);
return 0;
}
static int ksmbd_server_process_request(struct ksmbd_conn *conn)
{
return queue_ksmbd_work(conn);
}
static int ksmbd_server_terminate_conn(struct ksmbd_conn *conn)
{
ksmbd_sessions_deregister(conn);
destroy_lease_table(conn);
return 0;
}
static void ksmbd_server_tcp_callbacks_init(void)
{
struct ksmbd_conn_ops ops;
ops.process_fn = ksmbd_server_process_request;
ops.terminate_fn = ksmbd_server_terminate_conn;
ksmbd_conn_init_server_callbacks(&ops);
}
static void server_conf_free(void)
{
int i;
for (i = 0; i < ARRAY_SIZE(server_conf.conf); i++) {
kfree(server_conf.conf[i]);
server_conf.conf[i] = NULL;
}
}
static int server_conf_init(void)
{
WRITE_ONCE(server_conf.state, SERVER_STATE_STARTING_UP);
server_conf.enforced_signing = 0;
server_conf.min_protocol = ksmbd_min_protocol();
server_conf.max_protocol = ksmbd_max_protocol();
server_conf.auth_mechs = KSMBD_AUTH_NTLMSSP;
#ifdef CONFIG_SMB_SERVER_KERBEROS5
server_conf.auth_mechs |= KSMBD_AUTH_KRB5 |
KSMBD_AUTH_MSKRB5;
#endif
return 0;
}
static void server_ctrl_handle_init(struct server_ctrl_struct *ctrl)
{
int ret;
ret = ksmbd_conn_transport_init();
if (ret) {
server_queue_ctrl_reset_work();
return;
}
WRITE_ONCE(server_conf.state, SERVER_STATE_RUNNING);
}
static void server_ctrl_handle_reset(struct server_ctrl_struct *ctrl)
{
ksmbd_ipc_soft_reset();
ksmbd_conn_transport_destroy();
server_conf_free();
server_conf_init();
WRITE_ONCE(server_conf.state, SERVER_STATE_STARTING_UP);
}
static void server_ctrl_handle_work(struct work_struct *work)
{
struct server_ctrl_struct *ctrl;
ctrl = container_of(work, struct server_ctrl_struct, ctrl_work);
mutex_lock(&ctrl_lock);
switch (ctrl->type) {
case SERVER_CTRL_TYPE_INIT:
server_ctrl_handle_init(ctrl);
break;
case SERVER_CTRL_TYPE_RESET:
server_ctrl_handle_reset(ctrl);
break;
default:
pr_err("Unknown server work type: %d\n", ctrl->type);
}
mutex_unlock(&ctrl_lock);
kfree(ctrl);
module_put(THIS_MODULE);
}
static int __queue_ctrl_work(int type)
{
struct server_ctrl_struct *ctrl;
ctrl = kmalloc(sizeof(struct server_ctrl_struct), GFP_KERNEL);
if (!ctrl)
return -ENOMEM;
__module_get(THIS_MODULE);
ctrl->type = type;
INIT_WORK(&ctrl->ctrl_work, server_ctrl_handle_work);
queue_work(system_long_wq, &ctrl->ctrl_work);
return 0;
}
int server_queue_ctrl_init_work(void)
{
return __queue_ctrl_work(SERVER_CTRL_TYPE_INIT);
}
int server_queue_ctrl_reset_work(void)
{
return __queue_ctrl_work(SERVER_CTRL_TYPE_RESET);
}
static ssize_t stats_show(struct class *class,
struct class_attribute *attr,
char *buf)
{
/*
* Inc this each time you change stats output format,
* so user space will know what to do.
*/
static int stats_version = 2;
static const char * const state[] = {
"startup",
"running",
"reset",
"shutdown"
};
ssize_t sz = scnprintf(buf,
PAGE_SIZE,
"%d %s %d %lu\n",
stats_version,
state[server_conf.state],
server_conf.tcp_port,
server_conf.ipc_last_active / HZ);
return sz;
}
static ssize_t kill_server_store(struct class *class,
struct class_attribute *attr,
const char *buf,
size_t len)
{
if (!sysfs_streq(buf, "hard"))
return len;
ksmbd_info("kill command received\n");
mutex_lock(&ctrl_lock);
WRITE_ONCE(server_conf.state, SERVER_STATE_RESETTING);
__module_get(THIS_MODULE);
server_ctrl_handle_reset(NULL);
module_put(THIS_MODULE);
mutex_unlock(&ctrl_lock);
return len;
}
static const char * const debug_type_strings[] = {"smb", "auth", "vfs",
"oplock", "ipc", "conn",
"rdma"};
static ssize_t debug_show(struct class *class,
struct class_attribute *attr,
char *buf)
{
ssize_t sz = 0;
int i, pos = 0;
for (i = 0; i < ARRAY_SIZE(debug_type_strings); i++) {
if ((ksmbd_debug_types >> i) & 1) {
pos = scnprintf(buf + sz,
PAGE_SIZE - sz,
"[%s] ",
debug_type_strings[i]);
} else {
pos = scnprintf(buf + sz,
PAGE_SIZE - sz,
"%s ",
debug_type_strings[i]);
}
sz += pos;
}
sz += scnprintf(buf + sz, PAGE_SIZE - sz, "\n");
return sz;
}
static ssize_t debug_store(struct class *class,
struct class_attribute *attr,
const char *buf,
size_t len)
{
int i;
for (i = 0; i < ARRAY_SIZE(debug_type_strings); i++) {
if (sysfs_streq(buf, "all")) {
if (ksmbd_debug_types == KSMBD_DEBUG_ALL)
ksmbd_debug_types = 0;
else
ksmbd_debug_types = KSMBD_DEBUG_ALL;
break;
}
if (sysfs_streq(buf, debug_type_strings[i])) {
if (ksmbd_debug_types & (1 << i))
ksmbd_debug_types &= ~(1 << i);
else
ksmbd_debug_types |= (1 << i);
break;
}
}
return len;
}
static CLASS_ATTR_RO(stats);
static CLASS_ATTR_WO(kill_server);
static CLASS_ATTR_RW(debug);
static struct attribute *ksmbd_control_class_attrs[] = {
&class_attr_stats.attr,
&class_attr_kill_server.attr,
&class_attr_debug.attr,
NULL,
};
ATTRIBUTE_GROUPS(ksmbd_control_class);
static struct class ksmbd_control_class = {
.name = "ksmbd-control",
.owner = THIS_MODULE,
.class_groups = ksmbd_control_class_groups,
};
static int ksmbd_server_shutdown(void)
{
WRITE_ONCE(server_conf.state, SERVER_STATE_SHUTTING_DOWN);
class_unregister(&ksmbd_control_class);
ksmbd_workqueue_destroy();
ksmbd_ipc_release();
ksmbd_conn_transport_destroy();
ksmbd_free_session_table();
ksmbd_crypto_destroy();
ksmbd_free_global_file_table();
destroy_lease_table(NULL);
ksmbd_destroy_buffer_pools();
server_conf_free();
return 0;
}
static int __init ksmbd_server_init(void)
{
int ret;
ret = class_register(&ksmbd_control_class);
if (ret) {
ksmbd_err("Unable to register ksmbd-control class\n");
return ret;
}
ksmbd_server_tcp_callbacks_init();
ret = server_conf_init();
if (ret)
return ret;
ret = ksmbd_init_buffer_pools();
if (ret)
return ret;
ret = ksmbd_init_session_table();
if (ret)
goto error;
ret = ksmbd_ipc_init();
if (ret)
goto error;
ret = ksmbd_init_global_file_table();
if (ret)
goto error;
ret = ksmbd_inode_hash_init();
if (ret)
goto error;
ret = ksmbd_crypto_create();
if (ret)
goto error;
ret = ksmbd_workqueue_init();
if (ret)
goto error;
return 0;
error:
ksmbd_server_shutdown();
return ret;
}
/**
* exit_smb_server() - shutdown forker thread and free memory at module exit
*/
static void __exit ksmbd_server_exit(void)
{
ksmbd_server_shutdown();
ksmbd_release_inode_hash();
}
MODULE_AUTHOR("Namjae Jeon <linkinjeon@kernel.org>");
MODULE_VERSION(KSMBD_VERSION);
MODULE_DESCRIPTION("Linux kernel CIFS/SMB SERVER");
MODULE_LICENSE("GPL");
MODULE_SOFTDEP("pre: arc4");
MODULE_SOFTDEP("pre: ecb");
MODULE_SOFTDEP("pre: hmac");
MODULE_SOFTDEP("pre: md4");
MODULE_SOFTDEP("pre: md5");
MODULE_SOFTDEP("pre: nls");
MODULE_SOFTDEP("pre: aes");
MODULE_SOFTDEP("pre: cmac");
MODULE_SOFTDEP("pre: sha256");
MODULE_SOFTDEP("pre: sha512");
MODULE_SOFTDEP("pre: aead2");
MODULE_SOFTDEP("pre: ccm");
MODULE_SOFTDEP("pre: gcm");
module_init(ksmbd_server_init)
module_exit(ksmbd_server_exit)

62
fs/cifsd/server.h Normal file
View File

@ -0,0 +1,62 @@
/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* Copyright (C) 2018 Samsung Electronics Co., Ltd.
*/
#ifndef __SERVER_H__
#define __SERVER_H__
#include "smbacl.h"
#define SERVER_STATE_STARTING_UP 0
#define SERVER_STATE_RUNNING 1
#define SERVER_STATE_RESETTING 2
#define SERVER_STATE_SHUTTING_DOWN 3
#define SERVER_CONF_NETBIOS_NAME 0
#define SERVER_CONF_SERVER_STRING 1
#define SERVER_CONF_WORK_GROUP 2
extern int ksmbd_debugging;
struct ksmbd_server_config {
unsigned int flags;
unsigned int state;
short signing;
short enforced_signing;
short min_protocol;
short max_protocol;
unsigned short tcp_port;
unsigned short ipc_timeout;
unsigned long ipc_last_active;
unsigned long deadtime;
unsigned int share_fake_fscaps;
struct smb_sid domain_sid;
unsigned int auth_mechs;
char *conf[SERVER_CONF_WORK_GROUP + 1];
};
extern struct ksmbd_server_config server_conf;
int ksmbd_set_netbios_name(char *v);
int ksmbd_set_server_string(char *v);
int ksmbd_set_work_group(char *v);
char *ksmbd_netbios_name(void);
char *ksmbd_server_string(void);
char *ksmbd_work_group(void);
static inline int ksmbd_server_running(void)
{
return READ_ONCE(server_conf.state) == SERVER_STATE_RUNNING;
}
static inline int ksmbd_server_configurable(void)
{
return READ_ONCE(server_conf.state) < SERVER_STATE_RESETTING;
}
int server_queue_ctrl_init_work(void);
int server_queue_ctrl_reset_work(void);
#endif /* __SERVER_H__ */

900
fs/cifsd/transport_ipc.c Normal file
View File

@ -0,0 +1,900 @@
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (C) 2018 Samsung Electronics Co., Ltd.
*/
#include <linux/jhash.h>
#include <linux/slab.h>
#include <linux/rwsem.h>
#include <linux/mutex.h>
#include <linux/wait.h>
#include <linux/hashtable.h>
#include <net/net_namespace.h>
#include <net/genetlink.h>
#include <linux/socket.h>
#include <linux/workqueue.h>
#include "vfs_cache.h"
#include "transport_ipc.h"
#include "buffer_pool.h"
#include "server.h"
#include "smb_common.h"
#include "mgmt/user_config.h"
#include "mgmt/share_config.h"
#include "mgmt/user_session.h"
#include "mgmt/tree_connect.h"
#include "mgmt/ksmbd_ida.h"
#include "connection.h"
#include "transport_tcp.h"
/* @FIXME fix this code */
extern int get_protocol_idx(char *str);
#define IPC_WAIT_TIMEOUT (2 * HZ)
#define IPC_MSG_HASH_BITS 3
static DEFINE_HASHTABLE(ipc_msg_table, IPC_MSG_HASH_BITS);
static DECLARE_RWSEM(ipc_msg_table_lock);
static DEFINE_MUTEX(startup_lock);
static struct ksmbd_ida *ida;
static unsigned int ksmbd_tools_pid;
#define KSMBD_IPC_MSG_HANDLE(m) (*(unsigned int *)m)
static bool ksmbd_ipc_validate_version(struct genl_info *m)
{
if (m->genlhdr->version != KSMBD_GENL_VERSION) {
ksmbd_err("%s. ksmbd: %d, kernel module: %d. %s.\n",
"Daemon and kernel module version mismatch",
m->genlhdr->version,
KSMBD_GENL_VERSION,
"User-space ksmbd should terminate");
return false;
}
return true;
}
struct ksmbd_ipc_msg {
unsigned int type;
unsigned int sz;
unsigned char ____payload[0];
};
#define KSMBD_IPC_MSG_PAYLOAD(m) \
((void *)(((struct ksmbd_ipc_msg *)(m))->____payload))
struct ipc_msg_table_entry {
unsigned int handle;
unsigned int type;
wait_queue_head_t wait;
struct hlist_node ipc_table_hlist;
void *response;
};
static struct delayed_work ipc_timer_work;
static int handle_startup_event(struct sk_buff *skb, struct genl_info *info);
static int handle_unsupported_event(struct sk_buff *skb,
struct genl_info *info);
static int handle_generic_event(struct sk_buff *skb, struct genl_info *info);
static int ksmbd_ipc_heartbeat_request(void);
static const struct nla_policy ksmbd_nl_policy[KSMBD_EVENT_MAX] = {
[KSMBD_EVENT_UNSPEC] = {
.len = 0,
},
[KSMBD_EVENT_HEARTBEAT_REQUEST] = {
.len = sizeof(struct ksmbd_heartbeat),
},
[KSMBD_EVENT_STARTING_UP] = {
.len = sizeof(struct ksmbd_startup_request),
},
[KSMBD_EVENT_SHUTTING_DOWN] = {
.len = sizeof(struct ksmbd_shutdown_request),
},
[KSMBD_EVENT_LOGIN_REQUEST] = {
.len = sizeof(struct ksmbd_login_request),
},
[KSMBD_EVENT_LOGIN_RESPONSE] = {
.len = sizeof(struct ksmbd_login_response),
},
[KSMBD_EVENT_SHARE_CONFIG_REQUEST] = {
.len = sizeof(struct ksmbd_share_config_request),
},
[KSMBD_EVENT_SHARE_CONFIG_RESPONSE] = {
.len = sizeof(struct ksmbd_share_config_response),
},
[KSMBD_EVENT_TREE_CONNECT_REQUEST] = {
.len = sizeof(struct ksmbd_tree_connect_request),
},
[KSMBD_EVENT_TREE_CONNECT_RESPONSE] = {
.len = sizeof(struct ksmbd_tree_connect_response),
},
[KSMBD_EVENT_TREE_DISCONNECT_REQUEST] = {
.len = sizeof(struct ksmbd_tree_disconnect_request),
},
[KSMBD_EVENT_LOGOUT_REQUEST] = {
.len = sizeof(struct ksmbd_logout_request),
},
[KSMBD_EVENT_RPC_REQUEST] = {
},
[KSMBD_EVENT_RPC_RESPONSE] = {
},
[KSMBD_EVENT_SPNEGO_AUTHEN_REQUEST] = {
},
[KSMBD_EVENT_SPNEGO_AUTHEN_RESPONSE] = {
},
};
static struct genl_ops ksmbd_genl_ops[] = {
{
.cmd = KSMBD_EVENT_UNSPEC,
.doit = handle_unsupported_event,
},
{
.cmd = KSMBD_EVENT_HEARTBEAT_REQUEST,
.doit = handle_unsupported_event,
},
{
.cmd = KSMBD_EVENT_STARTING_UP,
.doit = handle_startup_event,
},
{
.cmd = KSMBD_EVENT_SHUTTING_DOWN,
.doit = handle_unsupported_event,
},
{
.cmd = KSMBD_EVENT_LOGIN_REQUEST,
.doit = handle_unsupported_event,
},
{
.cmd = KSMBD_EVENT_LOGIN_RESPONSE,
.doit = handle_generic_event,
},
{
.cmd = KSMBD_EVENT_SHARE_CONFIG_REQUEST,
.doit = handle_unsupported_event,
},
{
.cmd = KSMBD_EVENT_SHARE_CONFIG_RESPONSE,
.doit = handle_generic_event,
},
{
.cmd = KSMBD_EVENT_TREE_CONNECT_REQUEST,
.doit = handle_unsupported_event,
},
{
.cmd = KSMBD_EVENT_TREE_CONNECT_RESPONSE,
.doit = handle_generic_event,
},
{
.cmd = KSMBD_EVENT_TREE_DISCONNECT_REQUEST,
.doit = handle_unsupported_event,
},
{
.cmd = KSMBD_EVENT_LOGOUT_REQUEST,
.doit = handle_unsupported_event,
},
{
.cmd = KSMBD_EVENT_RPC_REQUEST,
.doit = handle_unsupported_event,
},
{
.cmd = KSMBD_EVENT_RPC_RESPONSE,
.doit = handle_generic_event,
},
{
.cmd = KSMBD_EVENT_SPNEGO_AUTHEN_REQUEST,
.doit = handle_unsupported_event,
},
{
.cmd = KSMBD_EVENT_SPNEGO_AUTHEN_RESPONSE,
.doit = handle_generic_event,
},
};
static struct genl_family ksmbd_genl_family = {
.name = KSMBD_GENL_NAME,
.version = KSMBD_GENL_VERSION,
.hdrsize = 0,
.maxattr = KSMBD_EVENT_MAX,
.netnsok = true,
.module = THIS_MODULE,
.ops = ksmbd_genl_ops,
.n_ops = ARRAY_SIZE(ksmbd_genl_ops),
};
static void ksmbd_nl_init_fixup(void)
{
int i;
for (i = 0; i < ARRAY_SIZE(ksmbd_genl_ops); i++)
ksmbd_genl_ops[i].validate = GENL_DONT_VALIDATE_STRICT |
GENL_DONT_VALIDATE_DUMP;
ksmbd_genl_family.policy = ksmbd_nl_policy;
}
static int rpc_context_flags(struct ksmbd_session *sess)
{
if (user_guest(sess->user))
return KSMBD_RPC_RESTRICTED_CONTEXT;
return 0;
}
static void ipc_update_last_active(void)
{
if (server_conf.ipc_timeout)
server_conf.ipc_last_active = jiffies;
}
static struct ksmbd_ipc_msg *ipc_msg_alloc(size_t sz)
{
struct ksmbd_ipc_msg *msg;
size_t msg_sz = sz + sizeof(struct ksmbd_ipc_msg);
msg = ksmbd_alloc(msg_sz);
if (msg)
msg->sz = sz;
return msg;
}
static void ipc_msg_free(struct ksmbd_ipc_msg *msg)
{
ksmbd_free(msg);
}
static void ipc_msg_handle_free(int handle)
{
if (handle >= 0)
ksmbd_release_id(ida, handle);
}
static int handle_response(int type, void *payload, size_t sz)
{
int handle = KSMBD_IPC_MSG_HANDLE(payload);
struct ipc_msg_table_entry *entry;
int ret = 0;
ipc_update_last_active();
down_read(&ipc_msg_table_lock);
hash_for_each_possible(ipc_msg_table, entry, ipc_table_hlist, handle) {
if (handle != entry->handle)
continue;
entry->response = NULL;
/*
* Response message type value should be equal to
* request message type + 1.
*/
if (entry->type + 1 != type) {
ksmbd_err("Waiting for IPC type %d, got %d. Ignore.\n",
entry->type + 1, type);
}
entry->response = ksmbd_alloc(sz);
if (!entry->response) {
ret = -ENOMEM;
break;
}
memcpy(entry->response, payload, sz);
wake_up_interruptible(&entry->wait);
ret = 0;
break;
}
up_read(&ipc_msg_table_lock);
return ret;
}
static int ipc_server_config_on_startup(struct ksmbd_startup_request *req)
{
int ret;
ksmbd_set_fd_limit(req->file_max);
server_conf.flags = req->flags;
server_conf.signing = req->signing;
server_conf.tcp_port = req->tcp_port;
server_conf.ipc_timeout = req->ipc_timeout * HZ;
server_conf.deadtime = req->deadtime * SMB_ECHO_INTERVAL;
server_conf.share_fake_fscaps = req->share_fake_fscaps;
ksmbd_init_domain(req->sub_auth);
if (req->smb2_max_read)
init_smb2_max_read_size(req->smb2_max_read);
if (req->smb2_max_write)
init_smb2_max_write_size(req->smb2_max_write);
if (req->smb2_max_trans)
init_smb2_max_trans_size(req->smb2_max_trans);
ret = ksmbd_set_netbios_name(req->netbios_name);
ret |= ksmbd_set_server_string(req->server_string);
ret |= ksmbd_set_work_group(req->work_group);
ret |= ksmbd_tcp_set_interfaces(KSMBD_STARTUP_CONFIG_INTERFACES(req),
req->ifc_list_sz);
if (ret) {
ksmbd_err("Server configuration error: %s %s %s\n",
req->netbios_name,
req->server_string,
req->work_group);
return ret;
}
if (req->min_prot[0]) {
ret = ksmbd_lookup_protocol_idx(req->min_prot);
if (ret >= 0)
server_conf.min_protocol = ret;
}
if (req->max_prot[0]) {
ret = ksmbd_lookup_protocol_idx(req->max_prot);
if (ret >= 0)
server_conf.max_protocol = ret;
}
if (server_conf.ipc_timeout)
schedule_delayed_work(&ipc_timer_work, server_conf.ipc_timeout);
return 0;
}
static int handle_startup_event(struct sk_buff *skb, struct genl_info *info)
{
int ret = 0;
#ifdef CONFIG_SMB_SERVER_CHECK_CAP_NET_ADMIN
if (!netlink_capable(skb, CAP_NET_ADMIN))
return -EPERM;
#endif
if (!ksmbd_ipc_validate_version(info))
return -EINVAL;
if (!info->attrs[KSMBD_EVENT_STARTING_UP])
return -EINVAL;
mutex_lock(&startup_lock);
if (!ksmbd_server_configurable()) {
mutex_unlock(&startup_lock);
ksmbd_err("Server reset is in progress, can't start daemon\n");
return -EINVAL;
}
if (ksmbd_tools_pid) {
if (ksmbd_ipc_heartbeat_request() == 0) {
ret = -EINVAL;
goto out;
}
ksmbd_err("Reconnect to a new user space daemon\n");
} else {
struct ksmbd_startup_request *req;
req = nla_data(info->attrs[info->genlhdr->cmd]);
ret = ipc_server_config_on_startup(req);
if (ret)
goto out;
server_queue_ctrl_init_work();
}
ksmbd_tools_pid = info->snd_portid;
ipc_update_last_active();
out:
mutex_unlock(&startup_lock);
return ret;
}
static int handle_unsupported_event(struct sk_buff *skb,
struct genl_info *info)
{
ksmbd_err("Unknown IPC event: %d, ignore.\n", info->genlhdr->cmd);
return -EINVAL;
}
static int handle_generic_event(struct sk_buff *skb, struct genl_info *info)
{
void *payload;
int sz;
int type = info->genlhdr->cmd;
#ifdef CONFIG_SMB_SERVER_CHECK_CAP_NET_ADMIN
if (!netlink_capable(skb, CAP_NET_ADMIN))
return -EPERM;
#endif
if (type >= KSMBD_EVENT_MAX) {
WARN_ON(1);
return -EINVAL;
}
if (!ksmbd_ipc_validate_version(info))
return -EINVAL;
if (!info->attrs[type])
return -EINVAL;
payload = nla_data(info->attrs[info->genlhdr->cmd]);
sz = nla_len(info->attrs[info->genlhdr->cmd]);
return handle_response(type, payload, sz);
}
static int ipc_msg_send(struct ksmbd_ipc_msg *msg)
{
struct genlmsghdr *nlh;
struct sk_buff *skb;
int ret = -EINVAL;
if (!ksmbd_tools_pid)
return ret;
skb = genlmsg_new(msg->sz, GFP_KERNEL);
if (!skb)
return -ENOMEM;
nlh = genlmsg_put(skb, 0, 0, &ksmbd_genl_family, 0, msg->type);
if (!nlh)
goto out;
ret = nla_put(skb, msg->type, msg->sz, KSMBD_IPC_MSG_PAYLOAD(msg));
if (ret) {
genlmsg_cancel(skb, nlh);
goto out;
}
genlmsg_end(skb, nlh);
ret = genlmsg_unicast(&init_net, skb, ksmbd_tools_pid);
if (!ret)
ipc_update_last_active();
return ret;
out:
nlmsg_free(skb);
return ret;
}
static void *ipc_msg_send_request(struct ksmbd_ipc_msg *msg,
unsigned int handle)
{
struct ipc_msg_table_entry entry;
int ret;
if ((int)handle < 0)
return NULL;
entry.type = msg->type;
entry.response = NULL;
init_waitqueue_head(&entry.wait);
down_write(&ipc_msg_table_lock);
entry.handle = handle;
hash_add(ipc_msg_table, &entry.ipc_table_hlist, entry.handle);
up_write(&ipc_msg_table_lock);
ret = ipc_msg_send(msg);
if (ret)
goto out;
ret = wait_event_interruptible_timeout(entry.wait,
entry.response != NULL,
IPC_WAIT_TIMEOUT);
out:
down_write(&ipc_msg_table_lock);
hash_del(&entry.ipc_table_hlist);
up_write(&ipc_msg_table_lock);
return entry.response;
}
static int ksmbd_ipc_heartbeat_request(void)
{
struct ksmbd_ipc_msg *msg;
int ret;
msg = ipc_msg_alloc(sizeof(struct ksmbd_heartbeat));
if (!msg)
return -EINVAL;
msg->type = KSMBD_EVENT_HEARTBEAT_REQUEST;
ret = ipc_msg_send(msg);
ipc_msg_free(msg);
return ret;
}
struct ksmbd_login_response *ksmbd_ipc_login_request(const char *account)
{
struct ksmbd_ipc_msg *msg;
struct ksmbd_login_request *req;
struct ksmbd_login_response *resp;
if (strlen(account) >= KSMBD_REQ_MAX_ACCOUNT_NAME_SZ)
return NULL;
msg = ipc_msg_alloc(sizeof(struct ksmbd_login_request));
if (!msg)
return NULL;
msg->type = KSMBD_EVENT_LOGIN_REQUEST;
req = KSMBD_IPC_MSG_PAYLOAD(msg);
req->handle = ksmbd_acquire_id(ida);
strscpy(req->account, account, KSMBD_REQ_MAX_ACCOUNT_NAME_SZ);
resp = ipc_msg_send_request(msg, req->handle);
ipc_msg_handle_free(req->handle);
ipc_msg_free(msg);
return resp;
}
struct ksmbd_spnego_authen_response *
ksmbd_ipc_spnego_authen_request(const char *spnego_blob, int blob_len)
{
struct ksmbd_ipc_msg *msg;
struct ksmbd_spnego_authen_request *req;
struct ksmbd_spnego_authen_response *resp;
msg = ipc_msg_alloc(sizeof(struct ksmbd_spnego_authen_request) +
blob_len + 1);
if (!msg)
return NULL;
msg->type = KSMBD_EVENT_SPNEGO_AUTHEN_REQUEST;
req = KSMBD_IPC_MSG_PAYLOAD(msg);
req->handle = ksmbd_acquire_id(ida);
req->spnego_blob_len = blob_len;
memcpy(req->spnego_blob, spnego_blob, blob_len);
resp = ipc_msg_send_request(msg, req->handle);
ipc_msg_handle_free(req->handle);
ipc_msg_free(msg);
return resp;
}
struct ksmbd_tree_connect_response *
ksmbd_ipc_tree_connect_request(struct ksmbd_session *sess,
struct ksmbd_share_config *share,
struct ksmbd_tree_connect *tree_conn,
struct sockaddr *peer_addr)
{
struct ksmbd_ipc_msg *msg;
struct ksmbd_tree_connect_request *req;
struct ksmbd_tree_connect_response *resp;
if (strlen(user_name(sess->user)) >= KSMBD_REQ_MAX_ACCOUNT_NAME_SZ)
return NULL;
if (strlen(share->name) >= KSMBD_REQ_MAX_SHARE_NAME)
return NULL;
msg = ipc_msg_alloc(sizeof(struct ksmbd_tree_connect_request));
if (!msg)
return NULL;
msg->type = KSMBD_EVENT_TREE_CONNECT_REQUEST;
req = KSMBD_IPC_MSG_PAYLOAD(msg);
req->handle = ksmbd_acquire_id(ida);
req->account_flags = sess->user->flags;
req->session_id = sess->id;
req->connect_id = tree_conn->id;
strscpy(req->account, user_name(sess->user), KSMBD_REQ_MAX_ACCOUNT_NAME_SZ);
strscpy(req->share, share->name, KSMBD_REQ_MAX_SHARE_NAME);
snprintf(req->peer_addr, sizeof(req->peer_addr), "%pIS", peer_addr);
if (peer_addr->sa_family == AF_INET6)
req->flags |= KSMBD_TREE_CONN_FLAG_REQUEST_IPV6;
if (test_session_flag(sess, CIFDS_SESSION_FLAG_SMB2))
req->flags |= KSMBD_TREE_CONN_FLAG_REQUEST_SMB2;
resp = ipc_msg_send_request(msg, req->handle);
ipc_msg_handle_free(req->handle);
ipc_msg_free(msg);
return resp;
}
int ksmbd_ipc_tree_disconnect_request(unsigned long long session_id,
unsigned long long connect_id)
{
struct ksmbd_ipc_msg *msg;
struct ksmbd_tree_disconnect_request *req;
int ret;
msg = ipc_msg_alloc(sizeof(struct ksmbd_tree_disconnect_request));
if (!msg)
return -ENOMEM;
msg->type = KSMBD_EVENT_TREE_DISCONNECT_REQUEST;
req = KSMBD_IPC_MSG_PAYLOAD(msg);
req->session_id = session_id;
req->connect_id = connect_id;
ret = ipc_msg_send(msg);
ipc_msg_free(msg);
return ret;
}
int ksmbd_ipc_logout_request(const char *account)
{
struct ksmbd_ipc_msg *msg;
struct ksmbd_logout_request *req;
int ret;
if (strlen(account) >= KSMBD_REQ_MAX_ACCOUNT_NAME_SZ)
return -EINVAL;
msg = ipc_msg_alloc(sizeof(struct ksmbd_logout_request));
if (!msg)
return -ENOMEM;
msg->type = KSMBD_EVENT_LOGOUT_REQUEST;
req = KSMBD_IPC_MSG_PAYLOAD(msg);
strscpy(req->account, account, KSMBD_REQ_MAX_ACCOUNT_NAME_SZ);
ret = ipc_msg_send(msg);
ipc_msg_free(msg);
return ret;
}
struct ksmbd_share_config_response *
ksmbd_ipc_share_config_request(const char *name)
{
struct ksmbd_ipc_msg *msg;
struct ksmbd_share_config_request *req;
struct ksmbd_share_config_response *resp;
if (strlen(name) >= KSMBD_REQ_MAX_SHARE_NAME)
return NULL;
msg = ipc_msg_alloc(sizeof(struct ksmbd_share_config_request));
if (!msg)
return NULL;
msg->type = KSMBD_EVENT_SHARE_CONFIG_REQUEST;
req = KSMBD_IPC_MSG_PAYLOAD(msg);
req->handle = ksmbd_acquire_id(ida);
strscpy(req->share_name, name, KSMBD_REQ_MAX_SHARE_NAME);
resp = ipc_msg_send_request(msg, req->handle);
ipc_msg_handle_free(req->handle);
ipc_msg_free(msg);
return resp;
}
struct ksmbd_rpc_command *ksmbd_rpc_open(struct ksmbd_session *sess,
int handle)
{
struct ksmbd_ipc_msg *msg;
struct ksmbd_rpc_command *req;
struct ksmbd_rpc_command *resp;
msg = ipc_msg_alloc(sizeof(struct ksmbd_rpc_command));
if (!msg)
return NULL;
msg->type = KSMBD_EVENT_RPC_REQUEST;
req = KSMBD_IPC_MSG_PAYLOAD(msg);
req->handle = handle;
req->flags = ksmbd_session_rpc_method(sess, handle);
req->flags |= KSMBD_RPC_OPEN_METHOD;
req->payload_sz = 0;
resp = ipc_msg_send_request(msg, req->handle);
ipc_msg_free(msg);
return resp;
}
struct ksmbd_rpc_command *ksmbd_rpc_close(struct ksmbd_session *sess,
int handle)
{
struct ksmbd_ipc_msg *msg;
struct ksmbd_rpc_command *req;
struct ksmbd_rpc_command *resp;
msg = ipc_msg_alloc(sizeof(struct ksmbd_rpc_command));
if (!msg)
return NULL;
msg->type = KSMBD_EVENT_RPC_REQUEST;
req = KSMBD_IPC_MSG_PAYLOAD(msg);
req->handle = handle;
req->flags = ksmbd_session_rpc_method(sess, handle);
req->flags |= KSMBD_RPC_CLOSE_METHOD;
req->payload_sz = 0;
resp = ipc_msg_send_request(msg, req->handle);
ipc_msg_free(msg);
return resp;
}
struct ksmbd_rpc_command *ksmbd_rpc_write(struct ksmbd_session *sess,
int handle,
void *payload,
size_t payload_sz)
{
struct ksmbd_ipc_msg *msg;
struct ksmbd_rpc_command *req;
struct ksmbd_rpc_command *resp;
msg = ipc_msg_alloc(sizeof(struct ksmbd_rpc_command) + payload_sz + 1);
if (!msg)
return NULL;
msg->type = KSMBD_EVENT_RPC_REQUEST;
req = KSMBD_IPC_MSG_PAYLOAD(msg);
req->handle = handle;
req->flags = ksmbd_session_rpc_method(sess, handle);
req->flags |= rpc_context_flags(sess);
req->flags |= KSMBD_RPC_WRITE_METHOD;
req->payload_sz = payload_sz;
memcpy(req->payload, payload, payload_sz);
resp = ipc_msg_send_request(msg, req->handle);
ipc_msg_free(msg);
return resp;
}
struct ksmbd_rpc_command *ksmbd_rpc_read(struct ksmbd_session *sess,
int handle)
{
struct ksmbd_ipc_msg *msg;
struct ksmbd_rpc_command *req;
struct ksmbd_rpc_command *resp;
msg = ipc_msg_alloc(sizeof(struct ksmbd_rpc_command));
if (!msg)
return NULL;
msg->type = KSMBD_EVENT_RPC_REQUEST;
req = KSMBD_IPC_MSG_PAYLOAD(msg);
req->handle = handle;
req->flags = ksmbd_session_rpc_method(sess, handle);
req->flags |= rpc_context_flags(sess);
req->flags |= KSMBD_RPC_READ_METHOD;
req->payload_sz = 0;
resp = ipc_msg_send_request(msg, req->handle);
ipc_msg_free(msg);
return resp;
}
struct ksmbd_rpc_command *ksmbd_rpc_ioctl(struct ksmbd_session *sess,
int handle,
void *payload,
size_t payload_sz)
{
struct ksmbd_ipc_msg *msg;
struct ksmbd_rpc_command *req;
struct ksmbd_rpc_command *resp;
msg = ipc_msg_alloc(sizeof(struct ksmbd_rpc_command) + payload_sz + 1);
if (!msg)
return NULL;
msg->type = KSMBD_EVENT_RPC_REQUEST;
req = KSMBD_IPC_MSG_PAYLOAD(msg);
req->handle = handle;
req->flags = ksmbd_session_rpc_method(sess, handle);
req->flags |= rpc_context_flags(sess);
req->flags |= KSMBD_RPC_IOCTL_METHOD;
req->payload_sz = payload_sz;
memcpy(req->payload, payload, payload_sz);
resp = ipc_msg_send_request(msg, req->handle);
ipc_msg_free(msg);
return resp;
}
struct ksmbd_rpc_command *ksmbd_rpc_rap(struct ksmbd_session *sess,
void *payload,
size_t payload_sz)
{
struct ksmbd_ipc_msg *msg;
struct ksmbd_rpc_command *req;
struct ksmbd_rpc_command *resp;
msg = ipc_msg_alloc(sizeof(struct ksmbd_rpc_command) + payload_sz + 1);
if (!msg)
return NULL;
msg->type = KSMBD_EVENT_RPC_REQUEST;
req = KSMBD_IPC_MSG_PAYLOAD(msg);
req->handle = ksmbd_acquire_id(ida);
req->flags = rpc_context_flags(sess);
req->flags |= KSMBD_RPC_RAP_METHOD;
req->payload_sz = payload_sz;
memcpy(req->payload, payload, payload_sz);
resp = ipc_msg_send_request(msg, req->handle);
ipc_msg_handle_free(req->handle);
ipc_msg_free(msg);
return resp;
}
static int __ipc_heartbeat(void)
{
unsigned long delta;
if (!ksmbd_server_running())
return 0;
if (time_after(jiffies, server_conf.ipc_last_active)) {
delta = (jiffies - server_conf.ipc_last_active);
} else {
ipc_update_last_active();
schedule_delayed_work(&ipc_timer_work,
server_conf.ipc_timeout);
return 0;
}
if (delta < server_conf.ipc_timeout) {
schedule_delayed_work(&ipc_timer_work,
server_conf.ipc_timeout - delta);
return 0;
}
if (ksmbd_ipc_heartbeat_request() == 0) {
schedule_delayed_work(&ipc_timer_work,
server_conf.ipc_timeout);
return 0;
}
mutex_lock(&startup_lock);
WRITE_ONCE(server_conf.state, SERVER_STATE_RESETTING);
server_conf.ipc_last_active = 0;
ksmbd_tools_pid = 0;
ksmbd_err("No IPC daemon response for %lus\n", delta / HZ);
mutex_unlock(&startup_lock);
return -EINVAL;
}
static void ipc_timer_heartbeat(struct work_struct *w)
{
if (__ipc_heartbeat())
server_queue_ctrl_reset_work();
}
int ksmbd_ipc_id_alloc(void)
{
return ksmbd_acquire_id(ida);
}
void ksmbd_rpc_id_free(int handle)
{
ksmbd_release_id(ida, handle);
}
void ksmbd_ipc_release(void)
{
cancel_delayed_work_sync(&ipc_timer_work);
ksmbd_ida_free(ida);
genl_unregister_family(&ksmbd_genl_family);
}
void ksmbd_ipc_soft_reset(void)
{
mutex_lock(&startup_lock);
ksmbd_tools_pid = 0;
cancel_delayed_work_sync(&ipc_timer_work);
mutex_unlock(&startup_lock);
}
int ksmbd_ipc_init(void)
{
int ret;
ksmbd_nl_init_fixup();
INIT_DELAYED_WORK(&ipc_timer_work, ipc_timer_heartbeat);
ret = genl_register_family(&ksmbd_genl_family);
if (ret) {
ksmbd_err("Failed to register KSMBD netlink interface %d\n",
ret);
return ret;
}
ida = ksmbd_ida_alloc();
if (!ida)
return -ENOMEM;
return 0;
}

63
fs/cifsd/transport_ipc.h Normal file
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@ -0,0 +1,63 @@
/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* Copyright (C) 2018 Samsung Electronics Co., Ltd.
*/
#ifndef __KSMBD_TRANSPORT_IPC_H__
#define __KSMBD_TRANSPORT_IPC_H__
#include <linux/wait.h>
#include "ksmbd_server.h" /* FIXME */
#define KSMBD_IPC_MAX_PAYLOAD 4096
struct ksmbd_login_response *
ksmbd_ipc_login_request(const char *account);
struct ksmbd_session;
struct ksmbd_share_config;
struct ksmbd_tree_connect;
struct sockaddr;
struct ksmbd_tree_connect_response *
ksmbd_ipc_tree_connect_request(struct ksmbd_session *sess,
struct ksmbd_share_config *share,
struct ksmbd_tree_connect *tree_conn,
struct sockaddr *peer_addr);
int ksmbd_ipc_tree_disconnect_request(unsigned long long session_id,
unsigned long long connect_id);
int ksmbd_ipc_logout_request(const char *account);
struct ksmbd_share_config_response *
ksmbd_ipc_share_config_request(const char *name);
struct ksmbd_spnego_authen_response *
ksmbd_ipc_spnego_authen_request(const char *spnego_blob, int blob_len);
int ksmbd_ipc_id_alloc(void);
void ksmbd_rpc_id_free(int handle);
struct ksmbd_rpc_command *ksmbd_rpc_open(struct ksmbd_session *sess,
int handle);
struct ksmbd_rpc_command *ksmbd_rpc_close(struct ksmbd_session *sess,
int handle);
struct ksmbd_rpc_command *ksmbd_rpc_write(struct ksmbd_session *sess,
int handle,
void *payload,
size_t payload_sz);
struct ksmbd_rpc_command *ksmbd_rpc_read(struct ksmbd_session *sess,
int handle);
struct ksmbd_rpc_command *ksmbd_rpc_ioctl(struct ksmbd_session *sess,
int handle,
void *payload,
size_t payload_sz);
struct ksmbd_rpc_command *ksmbd_rpc_rap(struct ksmbd_session *sess,
void *payload,
size_t payload_sz);
void ksmbd_ipc_release(void);
void ksmbd_ipc_soft_reset(void);
int ksmbd_ipc_init(void);
#endif /* __KSMBD_TRANSPORT_IPC_H__ */

2050
fs/cifsd/transport_rdma.c Normal file
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61
fs/cifsd/transport_rdma.h Normal file
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@ -0,0 +1,61 @@
/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* Copyright (C) 2017, Microsoft Corporation.
* Copyright (C) 2018, LG Electronics.
*/
#ifndef __KSMBD_TRANSPORT_RDMA_H__
#define __KSMBD_TRANSPORT_RDMA_H__
#define SMB_DIRECT_PORT 5445
/* SMB DIRECT negotiation request packet [MS-KSMBD] 2.2.1 */
struct smb_direct_negotiate_req {
__le16 min_version;
__le16 max_version;
__le16 reserved;
__le16 credits_requested;
__le32 preferred_send_size;
__le32 max_receive_size;
__le32 max_fragmented_size;
} __packed;
/* SMB DIRECT negotiation response packet [MS-KSMBD] 2.2.2 */
struct smb_direct_negotiate_resp {
__le16 min_version;
__le16 max_version;
__le16 negotiated_version;
__le16 reserved;
__le16 credits_requested;
__le16 credits_granted;
__le32 status;
__le32 max_readwrite_size;
__le32 preferred_send_size;
__le32 max_receive_size;
__le32 max_fragmented_size;
} __packed;
#define SMB_DIRECT_RESPONSE_REQUESTED 0x0001
/* SMB DIRECT data transfer packet with payload [MS-KSMBD] 2.2.3 */
struct smb_direct_data_transfer {
__le16 credits_requested;
__le16 credits_granted;
__le16 flags;
__le16 reserved;
__le32 remaining_data_length;
__le32 data_offset;
__le32 data_length;
__le32 padding;
__u8 buffer[];
} __packed;
#ifdef CONFIG_SMB_SERVER_SMBDIRECT
int ksmbd_rdma_init(void);
int ksmbd_rdma_destroy(void);
#else
static inline int ksmbd_rdma_init(void) { return 0; }
static inline int ksmbd_rdma_destroy(void) { return 0; }
#endif
#endif /* __KSMBD_TRANSPORT_RDMA_H__ */

624
fs/cifsd/transport_tcp.c Normal file
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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (C) 2016 Namjae Jeon <linkinjeon@kernel.org>
* Copyright (C) 2018 Samsung Electronics Co., Ltd.
*/
#include <linux/freezer.h>
#include "smb_common.h"
#include "server.h"
#include "auth.h"
#include "buffer_pool.h"
#include "connection.h"
#include "transport_tcp.h"
#define IFACE_STATE_DOWN (1 << 0)
#define IFACE_STATE_CONFIGURED (1 << 1)
struct interface {
struct task_struct *ksmbd_kthread;
struct socket *ksmbd_socket;
struct list_head entry;
char *name;
struct mutex sock_release_lock;
int state;
};
static LIST_HEAD(iface_list);
static int bind_additional_ifaces;
struct tcp_transport {
struct ksmbd_transport transport;
struct socket *sock;
struct kvec *iov;
unsigned int nr_iov;
};
static struct ksmbd_transport_ops ksmbd_tcp_transport_ops;
static void tcp_stop_kthread(struct task_struct *kthread);
static struct interface *alloc_iface(char *ifname);
#define KSMBD_TRANS(t) (&(t)->transport)
#define TCP_TRANS(t) ((struct tcp_transport *)container_of(t, \
struct tcp_transport, transport))
static inline void ksmbd_tcp_nodelay(struct socket *sock)
{
tcp_sock_set_nodelay(sock->sk);
}
static inline void ksmbd_tcp_reuseaddr(struct socket *sock)
{
sock_set_reuseaddr(sock->sk);
}
static inline void ksmbd_tcp_rcv_timeout(struct socket *sock, s64 secs)
{
lock_sock(sock->sk);
if (secs && secs < MAX_SCHEDULE_TIMEOUT / HZ - 1)
sock->sk->sk_rcvtimeo = secs * HZ;
else
sock->sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
release_sock(sock->sk);
}
static inline void ksmbd_tcp_snd_timeout(struct socket *sock, s64 secs)
{
sock_set_sndtimeo(sock->sk, secs);
}
static struct tcp_transport *alloc_transport(struct socket *client_sk)
{
struct tcp_transport *t;
struct ksmbd_conn *conn;
t = kzalloc(sizeof(*t), GFP_KERNEL);
if (!t)
return NULL;
t->sock = client_sk;
conn = ksmbd_conn_alloc();
if (!conn) {
kfree(t);
return NULL;
}
conn->transport = KSMBD_TRANS(t);
KSMBD_TRANS(t)->conn = conn;
KSMBD_TRANS(t)->ops = &ksmbd_tcp_transport_ops;
return t;
}
static void free_transport(struct tcp_transport *t)
{
kernel_sock_shutdown(t->sock, SHUT_RDWR);
sock_release(t->sock);
t->sock = NULL;
ksmbd_conn_free(KSMBD_TRANS(t)->conn);
kfree(t->iov);
kfree(t);
}
/**
* kvec_array_init() - initialize a IO vector segment
* @new: IO vector to be initialized
* @iov: base IO vector
* @nr_segs: number of segments in base iov
* @bytes: total iovec length so far for read
*
* Return: Number of IO segments
*/
static unsigned int kvec_array_init(struct kvec *new, struct kvec *iov,
unsigned int nr_segs, size_t bytes)
{
size_t base = 0;
while (bytes || !iov->iov_len) {
int copy = min(bytes, iov->iov_len);
bytes -= copy;
base += copy;
if (iov->iov_len == base) {
iov++;
nr_segs--;
base = 0;
}
}
memcpy(new, iov, sizeof(*iov) * nr_segs);
new->iov_base += base;
new->iov_len -= base;
return nr_segs;
}
/**
* get_conn_iovec() - get connection iovec for reading from socket
* @t: TCP transport instance
* @nr_segs: number of segments in iov
*
* Return: return existing or newly allocate iovec
*/
static struct kvec *get_conn_iovec(struct tcp_transport *t,
unsigned int nr_segs)
{
struct kvec *new_iov;
if (t->iov && nr_segs <= t->nr_iov)
return t->iov;
/* not big enough -- allocate a new one and release the old */
new_iov = kmalloc_array(nr_segs, sizeof(*new_iov), GFP_KERNEL);
if (new_iov) {
kfree(t->iov);
t->iov = new_iov;
t->nr_iov = nr_segs;
}
return new_iov;
}
static unsigned short ksmbd_tcp_get_port(const struct sockaddr *sa)
{
switch (sa->sa_family) {
case AF_INET:
return ntohs(((struct sockaddr_in *)sa)->sin_port);
case AF_INET6:
return ntohs(((struct sockaddr_in6 *)sa)->sin6_port);
}
return 0;
}
/**
* ksmbd_tcp_new_connection() - create a new tcp session on mount
* @sock: socket associated with new connection
*
* whenever a new connection is requested, create a conn thread
* (session thread) to handle new incoming smb requests from the connection
*
* Return: 0 on success, otherwise error
*/
static int ksmbd_tcp_new_connection(struct socket *client_sk)
{
struct sockaddr *csin;
int rc = 0;
struct tcp_transport *t;
t = alloc_transport(client_sk);
if (!t)
return -ENOMEM;
csin = KSMBD_TCP_PEER_SOCKADDR(KSMBD_TRANS(t)->conn);
if (kernel_getpeername(client_sk, csin) < 0) {
ksmbd_err("client ip resolution failed\n");
rc = -EINVAL;
goto out_error;
}
KSMBD_TRANS(t)->handler = kthread_run(ksmbd_conn_handler_loop,
KSMBD_TRANS(t)->conn,
"ksmbd:%u", ksmbd_tcp_get_port(csin));
if (IS_ERR(KSMBD_TRANS(t)->handler)) {
ksmbd_err("cannot start conn thread\n");
rc = PTR_ERR(KSMBD_TRANS(t)->handler);
free_transport(t);
}
return rc;
out_error:
free_transport(t);
return rc;
}
/**
* ksmbd_kthread_fn() - listen to new SMB connections and callback server
* @p: arguments to forker thread
*
* Return: Returns a task_struct or ERR_PTR
*/
static int ksmbd_kthread_fn(void *p)
{
struct socket *client_sk = NULL;
struct interface *iface = (struct interface *)p;
int ret;
while (!kthread_should_stop()) {
mutex_lock(&iface->sock_release_lock);
if (!iface->ksmbd_socket) {
mutex_unlock(&iface->sock_release_lock);
break;
}
ret = kernel_accept(iface->ksmbd_socket, &client_sk,
O_NONBLOCK);
mutex_unlock(&iface->sock_release_lock);
if (ret) {
if (ret == -EAGAIN)
/* check for new connections every 100 msecs */
schedule_timeout_interruptible(HZ / 10);
continue;
}
ksmbd_debug(CONN, "connect success: accepted new connection\n");
client_sk->sk->sk_rcvtimeo = KSMBD_TCP_RECV_TIMEOUT;
client_sk->sk->sk_sndtimeo = KSMBD_TCP_SEND_TIMEOUT;
ksmbd_tcp_new_connection(client_sk);
}
ksmbd_debug(CONN, "releasing socket\n");
return 0;
}
/**
* ksmbd_create_ksmbd_kthread() - start forker thread
*
* start forker thread(ksmbd/0) at module init time to listen
* on port 445 for new SMB connection requests. It creates per connection
* server threads(ksmbd/x)
*
* Return: 0 on success or error number
*/
static int ksmbd_tcp_run_kthread(struct interface *iface)
{
int rc;
struct task_struct *kthread;
kthread = kthread_run(ksmbd_kthread_fn, (void *)iface,
"ksmbd-%s", iface->name);
if (IS_ERR(kthread)) {
rc = PTR_ERR(kthread);
return rc;
}
iface->ksmbd_kthread = kthread;
return 0;
}
/**
* ksmbd_tcp_readv() - read data from socket in given iovec
* @t: TCP transport instance
* @iov_orig: base IO vector
* @nr_segs: number of segments in base iov
* @to_read: number of bytes to read from socket
*
* Return: on success return number of bytes read from socket,
* otherwise return error number
*/
static int ksmbd_tcp_readv(struct tcp_transport *t,
struct kvec *iov_orig,
unsigned int nr_segs,
unsigned int to_read)
{
int length = 0;
int total_read;
unsigned int segs;
struct msghdr ksmbd_msg;
struct kvec *iov;
struct ksmbd_conn *conn = KSMBD_TRANS(t)->conn;
iov = get_conn_iovec(t, nr_segs);
if (!iov)
return -ENOMEM;
ksmbd_msg.msg_control = NULL;
ksmbd_msg.msg_controllen = 0;
for (total_read = 0; to_read; total_read += length, to_read -= length) {
try_to_freeze();
if (!ksmbd_conn_alive(conn)) {
total_read = -ESHUTDOWN;
break;
}
segs = kvec_array_init(iov, iov_orig, nr_segs, total_read);
length = kernel_recvmsg(t->sock, &ksmbd_msg,
iov, segs, to_read, 0);
if (length == -EINTR) {
total_read = -ESHUTDOWN;
break;
} else if (conn->status == KSMBD_SESS_NEED_RECONNECT) {
total_read = -EAGAIN;
break;
} else if (length == -ERESTARTSYS || length == -EAGAIN) {
usleep_range(1000, 2000);
length = 0;
continue;
} else if (length <= 0) {
total_read = -EAGAIN;
break;
}
}
return total_read;
}
/**
* ksmbd_tcp_read() - read data from socket in given buffer
* @t: TCP transport instance
* @buf: buffer to store read data from socket
* @to_read: number of bytes to read from socket
*
* Return: on success return number of bytes read from socket,
* otherwise return error number
*/
static int ksmbd_tcp_read(struct ksmbd_transport *t,
char *buf,
unsigned int to_read)
{
struct kvec iov;
iov.iov_base = buf;
iov.iov_len = to_read;
return ksmbd_tcp_readv(TCP_TRANS(t), &iov, 1, to_read);
}
static int ksmbd_tcp_writev(struct ksmbd_transport *t,
struct kvec *iov, int nvecs, int size,
bool need_invalidate, unsigned int remote_key)
{
struct msghdr smb_msg = {.msg_flags = MSG_NOSIGNAL};
return kernel_sendmsg(TCP_TRANS(t)->sock, &smb_msg, iov, nvecs, size);
}
static void ksmbd_tcp_disconnect(struct ksmbd_transport *t)
{
free_transport(TCP_TRANS(t));
}
static void tcp_destroy_socket(struct socket *ksmbd_socket)
{
int ret;
if (!ksmbd_socket)
return;
/* set zero to timeout */
ksmbd_tcp_rcv_timeout(ksmbd_socket, 0);
ksmbd_tcp_snd_timeout(ksmbd_socket, 0);
ret = kernel_sock_shutdown(ksmbd_socket, SHUT_RDWR);
if (ret)
ksmbd_err("Failed to shutdown socket: %d\n", ret);
else
sock_release(ksmbd_socket);
}
/**
* create_socket - create socket for ksmbd/0
*
* Return: Returns a task_struct or ERR_PTR
*/
static int create_socket(struct interface *iface)
{
int ret;
struct sockaddr_in6 sin6;
struct sockaddr_in sin;
struct socket *ksmbd_socket;
bool ipv4 = false;
ret = sock_create(PF_INET6, SOCK_STREAM, IPPROTO_TCP, &ksmbd_socket);
if (ret) {
ksmbd_err("Can't create socket for ipv6, try ipv4: %d\n", ret);
ret = sock_create(PF_INET, SOCK_STREAM, IPPROTO_TCP,
&ksmbd_socket);
if (ret) {
ksmbd_err("Can't create socket for ipv4: %d\n", ret);
goto out_error;
}
sin.sin_family = PF_INET;
sin.sin_addr.s_addr = htonl(INADDR_ANY);
sin.sin_port = htons(server_conf.tcp_port);
ipv4 = true;
} else {
sin6.sin6_family = PF_INET6;
sin6.sin6_addr = in6addr_any;
sin6.sin6_port = htons(server_conf.tcp_port);
}
ksmbd_tcp_nodelay(ksmbd_socket);
ksmbd_tcp_reuseaddr(ksmbd_socket);
ret = sock_setsockopt(ksmbd_socket,
SOL_SOCKET,
SO_BINDTODEVICE,
KERNEL_SOCKPTR(iface->name),
strlen(iface->name));
if (ret != -ENODEV && ret < 0) {
ksmbd_err("Failed to set SO_BINDTODEVICE: %d\n", ret);
goto out_error;
}
if (ipv4)
ret = kernel_bind(ksmbd_socket, (struct sockaddr *)&sin,
sizeof(sin));
else
ret = kernel_bind(ksmbd_socket, (struct sockaddr *)&sin6,
sizeof(sin6));
if (ret) {
ksmbd_err("Failed to bind socket: %d\n", ret);
goto out_error;
}
ksmbd_socket->sk->sk_rcvtimeo = KSMBD_TCP_RECV_TIMEOUT;
ksmbd_socket->sk->sk_sndtimeo = KSMBD_TCP_SEND_TIMEOUT;
ret = kernel_listen(ksmbd_socket, KSMBD_SOCKET_BACKLOG);
if (ret) {
ksmbd_err("Port listen() error: %d\n", ret);
goto out_error;
}
iface->ksmbd_socket = ksmbd_socket;
ret = ksmbd_tcp_run_kthread(iface);
if (ret) {
ksmbd_err("Can't start ksmbd main kthread: %d\n", ret);
goto out_error;
}
iface->state = IFACE_STATE_CONFIGURED;
return 0;
out_error:
tcp_destroy_socket(ksmbd_socket);
iface->ksmbd_socket = NULL;
return ret;
}
static int ksmbd_netdev_event(struct notifier_block *nb, unsigned long event,
void *ptr)
{
struct net_device *netdev = netdev_notifier_info_to_dev(ptr);
struct interface *iface;
int ret, found = 0;
switch (event) {
case NETDEV_UP:
if (netdev->priv_flags & IFF_BRIDGE_PORT)
return NOTIFY_OK;
list_for_each_entry(iface, &iface_list, entry) {
if (!strcmp(iface->name, netdev->name)) {
found = 1;
if (iface->state != IFACE_STATE_DOWN)
break;
ret = create_socket(iface);
if (ret)
return NOTIFY_OK;
break;
}
}
if (!found && bind_additional_ifaces) {
iface = alloc_iface(kstrdup(netdev->name, GFP_KERNEL));
if (!iface)
return NOTIFY_OK;
ret = create_socket(iface);
if (ret)
break;
}
break;
case NETDEV_DOWN:
list_for_each_entry(iface, &iface_list, entry) {
if (!strcmp(iface->name, netdev->name) &&
iface->state == IFACE_STATE_CONFIGURED) {
tcp_stop_kthread(iface->ksmbd_kthread);
iface->ksmbd_kthread = NULL;
mutex_lock(&iface->sock_release_lock);
tcp_destroy_socket(iface->ksmbd_socket);
iface->ksmbd_socket = NULL;
mutex_unlock(&iface->sock_release_lock);
iface->state = IFACE_STATE_DOWN;
break;
}
}
break;
}
return NOTIFY_DONE;
}
static struct notifier_block ksmbd_netdev_notifier = {
.notifier_call = ksmbd_netdev_event,
};
int ksmbd_tcp_init(void)
{
register_netdevice_notifier(&ksmbd_netdev_notifier);
return 0;
}
static void tcp_stop_kthread(struct task_struct *kthread)
{
int ret;
if (!kthread)
return;
ret = kthread_stop(kthread);
if (ret)
ksmbd_err("failed to stop forker thread\n");
}
void ksmbd_tcp_destroy(void)
{
struct interface *iface, *tmp;
unregister_netdevice_notifier(&ksmbd_netdev_notifier);
list_for_each_entry_safe(iface, tmp, &iface_list, entry) {
list_del(&iface->entry);
kfree(iface->name);
ksmbd_free(iface);
}
}
static struct interface *alloc_iface(char *ifname)
{
struct interface *iface;
if (!ifname)
return NULL;
iface = ksmbd_alloc(sizeof(struct interface));
if (!iface) {
kfree(ifname);
return NULL;
}
iface->name = ifname;
iface->state = IFACE_STATE_DOWN;
list_add(&iface->entry, &iface_list);
mutex_init(&iface->sock_release_lock);
return iface;
}
int ksmbd_tcp_set_interfaces(char *ifc_list, int ifc_list_sz)
{
int sz = 0;
if (!ifc_list_sz) {
struct net_device *netdev;
rtnl_lock();
for_each_netdev(&init_net, netdev) {
if (netdev->priv_flags & IFF_BRIDGE_PORT)
continue;
if (!alloc_iface(kstrdup(netdev->name, GFP_KERNEL)))
return -ENOMEM;
}
rtnl_unlock();
bind_additional_ifaces = 1;
return 0;
}
while (ifc_list_sz > 0) {
if (!alloc_iface(kstrdup(ifc_list, GFP_KERNEL)))
return -ENOMEM;
sz = strlen(ifc_list);
if (!sz)
break;
ifc_list += sz + 1;
ifc_list_sz -= (sz + 1);
}
bind_additional_ifaces = 0;
return 0;
}
static struct ksmbd_transport_ops ksmbd_tcp_transport_ops = {
.read = ksmbd_tcp_read,
.writev = ksmbd_tcp_writev,
.disconnect = ksmbd_tcp_disconnect,
};

13
fs/cifsd/transport_tcp.h Normal file
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@ -0,0 +1,13 @@
/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* Copyright (C) 2018 Samsung Electronics Co., Ltd.
*/
#ifndef __KSMBD_TRANSPORT_TCP_H__
#define __KSMBD_TRANSPORT_TCP_H__
int ksmbd_tcp_set_interfaces(char *ifc_list, int ifc_list_sz);
int ksmbd_tcp_init(void);
void ksmbd_tcp_destroy(void);
#endif /* __KSMBD_TRANSPORT_TCP_H__ */