1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /*
3 * Copyright (C) 2018 Samsung Electronics Co., Ltd.
4 */
5
6 #ifndef __KSMBD_CONNECTION_H__
7 #define __KSMBD_CONNECTION_H__
8
9 #include <linux/list.h>
10 #include <linux/ip.h>
11 #include <net/sock.h>
12 #include <net/tcp.h>
13 #include <net/inet_connection_sock.h>
14 #include <net/request_sock.h>
15 #include <linux/kthread.h>
16 #include <linux/nls.h>
17 #include <linux/unicode.h>
18
19 #include "smb_common.h"
20 #include "ksmbd_work.h"
21
22 #define KSMBD_SOCKET_BACKLOG 16
23
24 enum {
25 KSMBD_SESS_NEW = 0,
26 KSMBD_SESS_GOOD,
27 KSMBD_SESS_EXITING,
28 KSMBD_SESS_NEED_RECONNECT,
29 KSMBD_SESS_NEED_NEGOTIATE,
30 KSMBD_SESS_RELEASING
31 };
32
33 struct ksmbd_stats {
34 atomic_t open_files_count;
35 atomic64_t request_served;
36 };
37
38 struct ksmbd_transport;
39
40 struct ksmbd_conn {
41 struct smb_version_values *vals;
42 struct smb_version_ops *ops;
43 struct smb_version_cmds *cmds;
44 unsigned int max_cmds;
45 struct mutex srv_mutex;
46 int status;
47 unsigned int cli_cap;
48 char *request_buf;
49 struct ksmbd_transport *transport;
50 struct nls_table *local_nls;
51 struct unicode_map *um;
52 struct list_head conns_list;
53 struct rw_semaphore session_lock;
54 /* smb session 1 per user */
55 struct xarray sessions;
56 unsigned long last_active;
57 /* How many request are running currently */
58 atomic_t req_running;
59 /* References which are made for this Server object*/
60 atomic_t r_count;
61 unsigned int total_credits;
62 unsigned int outstanding_credits;
63 spinlock_t credits_lock;
64 wait_queue_head_t req_running_q;
65 wait_queue_head_t r_count_q;
66 /* Lock to protect requests list*/
67 spinlock_t request_lock;
68 struct list_head requests;
69 struct list_head async_requests;
70 int connection_type;
71 struct ksmbd_stats stats;
72 char ClientGUID[SMB2_CLIENT_GUID_SIZE];
73 struct ntlmssp_auth ntlmssp;
74
75 spinlock_t llist_lock;
76 struct list_head lock_list;
77
78 struct preauth_integrity_info *preauth_info;
79
80 bool need_neg;
81 unsigned int auth_mechs;
82 unsigned int preferred_auth_mech;
83 bool sign;
84 bool use_spnego:1;
85 __u16 cli_sec_mode;
86 __u16 srv_sec_mode;
87 /* dialect index that server chose */
88 __u16 dialect;
89
90 char *mechToken;
91 unsigned int mechTokenLen;
92
93 struct ksmbd_conn_ops *conn_ops;
94
95 /* Preauth Session Table */
96 struct list_head preauth_sess_table;
97
98 struct sockaddr_storage peer_addr;
99
100 /* Identifier for async message */
101 struct ida async_ida;
102
103 __le16 cipher_type;
104 __le16 compress_algorithm;
105 bool posix_ext_supported;
106 bool signing_negotiated;
107 __le16 signing_algorithm;
108 bool binding;
109 atomic_t refcnt;
110 };
111
112 struct ksmbd_conn_ops {
113 int (*process_fn)(struct ksmbd_conn *conn);
114 int (*terminate_fn)(struct ksmbd_conn *conn);
115 };
116
117 struct ksmbd_transport_ops {
118 int (*prepare)(struct ksmbd_transport *t);
119 void (*disconnect)(struct ksmbd_transport *t);
120 void (*shutdown)(struct ksmbd_transport *t);
121 int (*read)(struct ksmbd_transport *t, char *buf,
122 unsigned int size, int max_retries);
123 int (*writev)(struct ksmbd_transport *t, struct kvec *iovs, int niov,
124 int size, bool need_invalidate_rkey,
125 unsigned int remote_key);
126 int (*rdma_read)(struct ksmbd_transport *t,
127 void *buf, unsigned int len,
128 struct smb2_buffer_desc_v1 *desc,
129 unsigned int desc_len);
130 int (*rdma_write)(struct ksmbd_transport *t,
131 void *buf, unsigned int len,
132 struct smb2_buffer_desc_v1 *desc,
133 unsigned int desc_len);
134 };
135
136 struct ksmbd_transport {
137 struct ksmbd_conn *conn;
138 const struct ksmbd_transport_ops *ops;
139 };
140
141 #define KSMBD_TCP_RECV_TIMEOUT (7 * HZ)
142 #define KSMBD_TCP_SEND_TIMEOUT (5 * HZ)
143 #define KSMBD_TCP_PEER_SOCKADDR(c) ((struct sockaddr *)&((c)->peer_addr))
144
145 extern struct list_head conn_list;
146 extern struct rw_semaphore conn_list_lock;
147
148 bool ksmbd_conn_alive(struct ksmbd_conn *conn);
149 void ksmbd_conn_wait_idle(struct ksmbd_conn *conn);
150 int ksmbd_conn_wait_idle_sess_id(struct ksmbd_conn *curr_conn, u64 sess_id);
151 struct ksmbd_conn *ksmbd_conn_alloc(void);
152 void ksmbd_conn_free(struct ksmbd_conn *conn);
153 bool ksmbd_conn_lookup_dialect(struct ksmbd_conn *c);
154 int ksmbd_conn_write(struct ksmbd_work *work);
155 int ksmbd_conn_rdma_read(struct ksmbd_conn *conn,
156 void *buf, unsigned int buflen,
157 struct smb2_buffer_desc_v1 *desc,
158 unsigned int desc_len);
159 int ksmbd_conn_rdma_write(struct ksmbd_conn *conn,
160 void *buf, unsigned int buflen,
161 struct smb2_buffer_desc_v1 *desc,
162 unsigned int desc_len);
163 void ksmbd_conn_enqueue_request(struct ksmbd_work *work);
164 void ksmbd_conn_try_dequeue_request(struct ksmbd_work *work);
165 void ksmbd_conn_init_server_callbacks(struct ksmbd_conn_ops *ops);
166 int ksmbd_conn_handler_loop(void *p);
167 int ksmbd_conn_transport_init(void);
168 void ksmbd_conn_transport_destroy(void);
169 void ksmbd_conn_lock(struct ksmbd_conn *conn);
170 void ksmbd_conn_unlock(struct ksmbd_conn *conn);
171
172 /*
173 * WARNING
174 *
175 * This is a hack. We will move status to a proper place once we land
176 * a multi-sessions support.
177 */
178 static inline bool ksmbd_conn_good(struct ksmbd_conn *conn)
179 {
180 return READ_ONCE(conn->status) == KSMBD_SESS_GOOD;
181 }
182
183 static inline bool ksmbd_conn_need_negotiate(struct ksmbd_conn *conn)
184 {
185 return READ_ONCE(conn->status) == KSMBD_SESS_NEED_NEGOTIATE;
186 }
187
188 static inline bool ksmbd_conn_need_reconnect(struct ksmbd_conn *conn)
189 {
190 return READ_ONCE(conn->status) == KSMBD_SESS_NEED_RECONNECT;
191 }
192
193 static inline bool ksmbd_conn_exiting(struct ksmbd_conn *conn)
194 {
195 return READ_ONCE(conn->status) == KSMBD_SESS_EXITING;
196 }
197
198 static inline bool ksmbd_conn_releasing(struct ksmbd_conn *conn)
199 {
200 return READ_ONCE(conn->status) == KSMBD_SESS_RELEASING;
201 }
202
203 static inline void ksmbd_conn_set_new(struct ksmbd_conn *conn)
204 {
205 WRITE_ONCE(conn->status, KSMBD_SESS_NEW);
206 }
207
208 static inline void ksmbd_conn_set_good(struct ksmbd_conn *conn)
209 {
210 WRITE_ONCE(conn->status, KSMBD_SESS_GOOD);
211 }
212
213 static inline void ksmbd_conn_set_need_negotiate(struct ksmbd_conn *conn)
214 {
215 WRITE_ONCE(conn->status, KSMBD_SESS_NEED_NEGOTIATE);
216 }
217
218 static inline void ksmbd_conn_set_need_reconnect(struct ksmbd_conn *conn)
219 {
220 WRITE_ONCE(conn->status, KSMBD_SESS_NEED_RECONNECT);
221 }
222
223 static inline void ksmbd_conn_set_exiting(struct ksmbd_conn *conn)
224 {
225 WRITE_ONCE(conn->status, KSMBD_SESS_EXITING);
226 }
227
228 static inline void ksmbd_conn_set_releasing(struct ksmbd_conn *conn)
229 {
230 WRITE_ONCE(conn->status, KSMBD_SESS_RELEASING);
231 }
232
233 void ksmbd_all_conn_set_status(u64 sess_id, u32 status);
234 #endif /* __CONNECTION_H__ */
235
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