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 short total_credits;
65 unsigned short max_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 union {
76 /* pending trans request table */
77 struct trans_state *recent_trans;
78 /* Used by ntlmssp */
79 char *ntlmssp_cryptkey;
80 };
81
82 spinlock_t llist_lock;
83 struct list_head lock_list;
84
85 struct preauth_integrity_info *preauth_info;
86
87 bool need_neg;
88 unsigned int auth_mechs;
89 unsigned int preferred_auth_mech;
90 bool sign;
91 bool use_spnego:1;
92 __u16 cli_sec_mode;
93 __u16 srv_sec_mode;
94 /* dialect index that server chose */
95 __u16 dialect;
96
97 char *mechToken;
98
99 struct ksmbd_conn_ops *conn_ops;
100
101 /* Preauth Session Table */
102 struct list_head preauth_sess_table;
103
104 struct sockaddr_storage peer_addr;
105
106 /* Identifier for async message */
107 struct ida async_ida;
108
109 __le16 cipher_type;
110 __le16 compress_algorithm;
111 bool posix_ext_supported;
112 bool signing_negotiated;
113 __le16 signing_algorithm;
114 bool binding;
115 };
116
117 struct ksmbd_conn_ops {
118 int (*process_fn)(struct ksmbd_conn *conn);
119 int (*terminate_fn)(struct ksmbd_conn *conn);
120 };
121
122 struct ksmbd_transport_ops {
123 int (*prepare)(struct ksmbd_transport *t);
124 void (*disconnect)(struct ksmbd_transport *t);
125 int (*read)(struct ksmbd_transport *t, char *buf, unsigned int size);
126 int (*writev)(struct ksmbd_transport *t, struct kvec *iovs, int niov,
127 int size, bool need_invalidate_rkey,
128 unsigned int remote_key);
129 int (*rdma_read)(struct ksmbd_transport *t, void *buf, unsigned int len,
130 u32 remote_key, u64 remote_offset, u32 remote_len);
131 int (*rdma_write)(struct ksmbd_transport *t, void *buf,
132 unsigned int len, u32 remote_key, u64 remote_offset,
133 u32 remote_len);
134 };
135
136 struct ksmbd_transport {
137 struct ksmbd_conn *conn;
138 struct ksmbd_transport_ops *ops;
139 struct task_struct *handler;
140 };
141
142 #define KSMBD_TCP_RECV_TIMEOUT (7 * HZ)
143 #define KSMBD_TCP_SEND_TIMEOUT (5 * HZ)
144 #define KSMBD_TCP_PEER_SOCKADDR(c) ((struct sockaddr *)&((c)->peer_addr))
145
146 extern struct list_head conn_list;
147 extern rwlock_t conn_list_lock;
148
149 bool ksmbd_conn_alive(struct ksmbd_conn *conn);
150 void ksmbd_conn_wait_idle(struct ksmbd_conn *conn);
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, void *buf,
156 unsigned int buflen, u32 remote_key, u64 remote_offset,
157 u32 remote_len);
158 int ksmbd_conn_rdma_write(struct ksmbd_conn *conn, void *buf,
159 unsigned int buflen, u32 remote_key, u64 remote_offset,
160 u32 remote_len);
161 void ksmbd_conn_enqueue_request(struct ksmbd_work *work);
162 int ksmbd_conn_try_dequeue_request(struct ksmbd_work *work);
163 void ksmbd_conn_init_server_callbacks(struct ksmbd_conn_ops *ops);
164 int ksmbd_conn_handler_loop(void *p);
165 int ksmbd_conn_transport_init(void);
166 void ksmbd_conn_transport_destroy(void);
167
168 /*
169 * WARNING
170 *
171 * This is a hack. We will move status to a proper place once we land
172 * a multi-sessions support.
173 */
ksmbd_conn_good(struct ksmbd_work * work)174 static inline bool ksmbd_conn_good(struct ksmbd_work *work)
175 {
176 return work->conn->status == KSMBD_SESS_GOOD;
177 }
178
ksmbd_conn_need_negotiate(struct ksmbd_work * work)179 static inline bool ksmbd_conn_need_negotiate(struct ksmbd_work *work)
180 {
181 return work->conn->status == KSMBD_SESS_NEED_NEGOTIATE;
182 }
183
ksmbd_conn_need_reconnect(struct ksmbd_work * work)184 static inline bool ksmbd_conn_need_reconnect(struct ksmbd_work *work)
185 {
186 return work->conn->status == KSMBD_SESS_NEED_RECONNECT;
187 }
188
ksmbd_conn_exiting(struct ksmbd_work * work)189 static inline bool ksmbd_conn_exiting(struct ksmbd_work *work)
190 {
191 return work->conn->status == KSMBD_SESS_EXITING;
192 }
193
ksmbd_conn_set_good(struct ksmbd_work * work)194 static inline void ksmbd_conn_set_good(struct ksmbd_work *work)
195 {
196 work->conn->status = KSMBD_SESS_GOOD;
197 }
198
ksmbd_conn_set_need_negotiate(struct ksmbd_work * work)199 static inline void ksmbd_conn_set_need_negotiate(struct ksmbd_work *work)
200 {
201 work->conn->status = KSMBD_SESS_NEED_NEGOTIATE;
202 }
203
ksmbd_conn_set_need_reconnect(struct ksmbd_work * work)204 static inline void ksmbd_conn_set_need_reconnect(struct ksmbd_work *work)
205 {
206 work->conn->status = KSMBD_SESS_NEED_RECONNECT;
207 }
208
ksmbd_conn_set_exiting(struct ksmbd_work * work)209 static inline void ksmbd_conn_set_exiting(struct ksmbd_work *work)
210 {
211 work->conn->status = KSMBD_SESS_EXITING;
212 }
213 #endif /* __CONNECTION_H__ */
214