fs/smb/server/connection.h

   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
  92         struct ksmbd_conn_ops   *conn_ops;
  93
  94         /* Preauth Session Table */
  95         struct list_head                preauth_sess_table;
  96
  97         struct sockaddr_storage         peer_addr;
  98
  99         /* Identifier for async message */
 100         struct ida                      async_ida;
 101
 102         __le16                          cipher_type;
 103         __le16                          compress_algorithm;
 104         bool                            posix_ext_supported;
 105         bool                            signing_negotiated;
 106         __le16                          signing_algorithm;
 107         bool                            binding;
 108 };
 109
 110 struct ksmbd_conn_ops {
 111         int     (*process_fn)(struct ksmbd_conn *conn);
 112         int     (*terminate_fn)(struct ksmbd_conn *conn);
 113 };
 114
 115 struct ksmbd_transport_ops {
 116         int (*prepare)(struct ksmbd_transport *t);
 117         void (*disconnect)(struct ksmbd_transport *t);
 118         void (*shutdown)(struct ksmbd_transport *t);
 119         int (*read)(struct ksmbd_transport *t, char *buf,
 120                     unsigned int size, int max_retries);
 121         int (*writev)(struct ksmbd_transport *t, struct kvec *iovs, int niov,
 122                       int size, bool need_invalidate_rkey,
 123                       unsigned int remote_key);
 124         int (*rdma_read)(struct ksmbd_transport *t,
 125                          void *buf, unsigned int len,
 126                          struct smb2_buffer_desc_v1 *desc,
 127                          unsigned int desc_len);
 128         int (*rdma_write)(struct ksmbd_transport *t,
 129                           void *buf, unsigned int len,
 130                           struct smb2_buffer_desc_v1 *desc,
 131                           unsigned int desc_len);
 132 };
 133
 134 struct ksmbd_transport {
 135         struct ksmbd_conn               *conn;
 136         struct ksmbd_transport_ops      *ops;
 137         struct task_struct              *handler;
 138 };
 139
 140 #define KSMBD_TCP_RECV_TIMEOUT  (7 * HZ)
 141 #define KSMBD_TCP_SEND_TIMEOUT  (5 * HZ)
 142 #define KSMBD_TCP_PEER_SOCKADDR(c)      ((struct sockaddr *)&((c)->peer_addr))
 143
 144 extern struct list_head conn_list;
 145 extern struct rw_semaphore conn_list_lock;
 146
 147 bool ksmbd_conn_alive(struct ksmbd_conn *conn);
 148 void ksmbd_conn_wait_idle(struct ksmbd_conn *conn, u64 sess_id);
 149 struct ksmbd_conn *ksmbd_conn_alloc(void);
 150 void ksmbd_conn_free(struct ksmbd_conn *conn);
 151 bool ksmbd_conn_lookup_dialect(struct ksmbd_conn *c);
 152 int ksmbd_conn_write(struct ksmbd_work *work);
 153 int ksmbd_conn_rdma_read(struct ksmbd_conn *conn,
 154                          void *buf, unsigned int buflen,
 155                          struct smb2_buffer_desc_v1 *desc,
 156                          unsigned int desc_len);
 157 int ksmbd_conn_rdma_write(struct ksmbd_conn *conn,
 158                           void *buf, unsigned int buflen,
 159                           struct smb2_buffer_desc_v1 *desc,
 160                           unsigned int desc_len);
 161 void ksmbd_conn_enqueue_request(struct ksmbd_work *work);
 162 void 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 void ksmbd_conn_lock(struct ksmbd_conn *conn);
 168 void ksmbd_conn_unlock(struct ksmbd_conn *conn);
 169
 170 /*
 171  * WARNING
 172  *
 173  * This is a hack. We will move status to a proper place once we land
 174  * a multi-sessions support.
 175  */
 176 static inline bool ksmbd_conn_good(struct ksmbd_conn *conn)
 177 {
 178         return READ_ONCE(conn->status) == KSMBD_SESS_GOOD;
 179 }
 180
 181 static inline bool ksmbd_conn_need_negotiate(struct ksmbd_conn *conn)
 182 {
 183         return READ_ONCE(conn->status) == KSMBD_SESS_NEED_NEGOTIATE;
 184 }
 185
 186 static inline bool ksmbd_conn_need_reconnect(struct ksmbd_conn *conn)
 187 {
 188         return READ_ONCE(conn->status) == KSMBD_SESS_NEED_RECONNECT;
 189 }
 190
 191 static inline bool ksmbd_conn_exiting(struct ksmbd_conn *conn)
 192 {
 193         return READ_ONCE(conn->status) == KSMBD_SESS_EXITING;
 194 }
 195
 196 static inline bool ksmbd_conn_releasing(struct ksmbd_conn *conn)
 197 {
 198         return READ_ONCE(conn->status) == KSMBD_SESS_RELEASING;
 199 }
 200
 201 static inline void ksmbd_conn_set_new(struct ksmbd_conn *conn)
 202 {
 203         WRITE_ONCE(conn->status, KSMBD_SESS_NEW);
 204 }
 205
 206 static inline void ksmbd_conn_set_good(struct ksmbd_conn *conn)
 207 {
 208         WRITE_ONCE(conn->status, KSMBD_SESS_GOOD);
 209 }
 210
 211 static inline void ksmbd_conn_set_need_negotiate(struct ksmbd_conn *conn)
 212 {
 213         WRITE_ONCE(conn->status, KSMBD_SESS_NEED_NEGOTIATE);
 214 }
 215
 216 static inline void ksmbd_conn_set_need_reconnect(struct ksmbd_conn *conn)
 217 {
 218         WRITE_ONCE(conn->status, KSMBD_SESS_NEED_RECONNECT);
 219 }
 220
 221 static inline void ksmbd_conn_set_exiting(struct ksmbd_conn *conn)
 222 {
 223         WRITE_ONCE(conn->status, KSMBD_SESS_EXITING);
 224 }
 225
 226 static inline void ksmbd_conn_set_releasing(struct ksmbd_conn *conn)
 227 {
 228         WRITE_ONCE(conn->status, KSMBD_SESS_RELEASING);
 229 }
 230
 231 void ksmbd_all_conn_set_status(u64 sess_id, u32 status);
 232 #endif /* __CONNECTION_H__ */