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
18 #include "smb_common.h"
19 #include "ksmbd_work.h"
20
21 #define KSMBD_SOCKET_BACKLOG 16
22
23 /*
24 * WARNING
25 *
26 * This is nothing but a HACK. Session status should move to channel
27 * or to session. As of now we have 1 tcp_conn : 1 ksmbd_session, but
28 * we need to change it to 1 tcp_conn : N ksmbd_sessions.
29 */
30 enum {
31 KSMBD_SESS_NEW = 0,
32 KSMBD_SESS_GOOD,
33 KSMBD_SESS_EXITING,
34 KSMBD_SESS_NEED_RECONNECT,
35 KSMBD_SESS_NEED_NEGOTIATE
36 };
37
38 struct ksmbd_stats {
39 atomic_t open_files_count;
40 atomic64_t request_served;
41 };
42
43 struct ksmbd_transport;
44
45 struct ksmbd_conn {
46 struct smb_version_values *vals;
47 struct smb_version_ops *ops;
48 struct smb_version_cmds *cmds;
49 unsigned int max_cmds;
50 struct mutex srv_mutex;
51 int status;
52 unsigned int cli_cap;
53 char *request_buf;
54 struct ksmbd_transport *transport;
55 struct nls_table *local_nls;
56 struct list_head conns_list;
57 /* smb session 1 per user */
58 struct list_head sessions;
59 unsigned long last_active;
60 /* How many request are running currently */
61 atomic_t req_running;
62 /* References which are made for this Server object*/
63 atomic_t r_count;
64 unsigned int total_credits;
65 unsigned int outstanding_credits;
66 spinlock_t credits_lock;
67 wait_queue_head_t req_running_q;
68 /* Lock to protect requests list*/
69 spinlock_t request_lock;
70 struct list_head requests;
71 struct list_head async_requests;
72 int connection_type;
73 struct ksmbd_stats stats;
74 char ClientGUID[SMB2_CLIENT_GUID_SIZE];
75 struct ntlmssp_auth ntlmssp;
76
77 spinlock_t llist_lock;
78 struct list_head lock_list;
79
80 struct preauth_integrity_info *preauth_info;
81
82 bool need_neg;
83 unsigned int auth_mechs;
84 unsigned int preferred_auth_mech;
85 bool sign;
86 bool use_spnego:1;
87 __u16 cli_sec_mode;
88 __u16 srv_sec_mode;
89 /* dialect index that server chose */
90 __u16 dialect;
91
92 char *mechToken;
93
94 struct ksmbd_conn_ops *conn_ops;
95
96 /* Preauth Session Table */
97 struct list_head preauth_sess_table;
98
99 struct sockaddr_storage peer_addr;
100
101 /* Identifier for async message */
102 struct ida async_ida;
103
104 __le16 cipher_type;
105 __le16 compress_algorithm;
106 bool posix_ext_supported;
107 bool signing_negotiated;
108 __le16 signing_algorithm;
109 bool binding;
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, unsigned int size);
122 int (*writev)(struct ksmbd_transport *t, struct kvec *iovs, int niov,
123 int size, bool need_invalidate_rkey,
124 unsigned int remote_key);
125 int (*rdma_read)(struct ksmbd_transport *t,
126 void *buf, unsigned int len,
127 struct smb2_buffer_desc_v1 *desc,
128 unsigned int desc_len);
129 int (*rdma_write)(struct ksmbd_transport *t,
130 void *buf, unsigned int len,
131 struct smb2_buffer_desc_v1 *desc,
132 unsigned int desc_len);
133 };
134
135 struct ksmbd_transport {
136 struct ksmbd_conn *conn;
137 struct ksmbd_transport_ops *ops;
138 struct task_struct *handler;
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 rwlock_t conn_list_lock;
147
148 bool ksmbd_conn_alive(struct ksmbd_conn *conn);
149 void ksmbd_conn_wait_idle(struct ksmbd_conn *conn);
150 struct ksmbd_conn *ksmbd_conn_alloc(void);
151 void ksmbd_conn_free(struct ksmbd_conn *conn);
152 bool ksmbd_conn_lookup_dialect(struct ksmbd_conn *c);
153 int ksmbd_conn_write(struct ksmbd_work *work);
154 int ksmbd_conn_rdma_read(struct ksmbd_conn *conn,
155 void *buf, unsigned int buflen,
156 struct smb2_buffer_desc_v1 *desc,
157 unsigned int desc_len);
158 int ksmbd_conn_rdma_write(struct ksmbd_conn *conn,
159 void *buf, unsigned int buflen,
160 struct smb2_buffer_desc_v1 *desc,
161 unsigned int desc_len);
162 void ksmbd_conn_enqueue_request(struct ksmbd_work *work);
163 int ksmbd_conn_try_dequeue_request(struct ksmbd_work *work);
164 void ksmbd_conn_init_server_callbacks(struct ksmbd_conn_ops *ops);
165 int ksmbd_conn_handler_loop(void *p);
166 int ksmbd_conn_transport_init(void);
167 void ksmbd_conn_transport_destroy(void);
168
169 /*
170 * WARNING
171 *
172 * This is a hack. We will move status to a proper place once we land
173 * a multi-sessions support.
174 */
ksmbd_conn_good(struct ksmbd_work * work)175 static inline bool ksmbd_conn_good(struct ksmbd_work *work)
176 {
177 return work->conn->status == KSMBD_SESS_GOOD;
178 }
179
ksmbd_conn_need_negotiate(struct ksmbd_work * work)180 static inline bool ksmbd_conn_need_negotiate(struct ksmbd_work *work)
181 {
182 return work->conn->status == KSMBD_SESS_NEED_NEGOTIATE;
183 }
184
ksmbd_conn_need_reconnect(struct ksmbd_work * work)185 static inline bool ksmbd_conn_need_reconnect(struct ksmbd_work *work)
186 {
187 return work->conn->status == KSMBD_SESS_NEED_RECONNECT;
188 }
189
ksmbd_conn_exiting(struct ksmbd_work * work)190 static inline bool ksmbd_conn_exiting(struct ksmbd_work *work)
191 {
192 return work->conn->status == KSMBD_SESS_EXITING;
193 }
194
ksmbd_conn_set_good(struct ksmbd_work * work)195 static inline void ksmbd_conn_set_good(struct ksmbd_work *work)
196 {
197 work->conn->status = KSMBD_SESS_GOOD;
198 }
199
ksmbd_conn_set_need_negotiate(struct ksmbd_work * work)200 static inline void ksmbd_conn_set_need_negotiate(struct ksmbd_work *work)
201 {
202 work->conn->status = KSMBD_SESS_NEED_NEGOTIATE;
203 }
204
ksmbd_conn_set_need_reconnect(struct ksmbd_work * work)205 static inline void ksmbd_conn_set_need_reconnect(struct ksmbd_work *work)
206 {
207 work->conn->status = KSMBD_SESS_NEED_RECONNECT;
208 }
209
ksmbd_conn_set_exiting(struct ksmbd_work * work)210 static inline void ksmbd_conn_set_exiting(struct ksmbd_work *work)
211 {
212 work->conn->status = KSMBD_SESS_EXITING;
213 }
214 #endif /* __CONNECTION_H__ */
215