fs/cifsd/mgmt/tree_connect.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *   Copyright (C) 2018 Samsung Electronics Co., Ltd.
   4  */
   5
   6 #include <linux/list.h>
   7 #include <linux/slab.h>
   8 #include <linux/xarray.h>
   9
  10 #include "../buffer_pool.h"
  11 #include "../transport_ipc.h"
  12 #include "../connection.h"
  13
  14 #include "tree_connect.h"
  15 #include "user_config.h"
  16 #include "share_config.h"
  17 #include "user_session.h"
  18
  19 struct ksmbd_tree_conn_status
  20 ksmbd_tree_conn_connect(struct ksmbd_session *sess, char *share_name)
  21 {
  22         struct ksmbd_tree_conn_status status = {-EINVAL, NULL};
  23         struct ksmbd_tree_connect_response *resp = NULL;
  24         struct ksmbd_share_config *sc;
  25         struct ksmbd_tree_connect *tree_conn = NULL;
  26         struct sockaddr *peer_addr;
  27         int ret;
  28
  29         sc = ksmbd_share_config_get(share_name);
  30         if (!sc)
  31                 return status;
  32
  33         tree_conn = kzalloc(sizeof(struct ksmbd_tree_connect), GFP_KERNEL);
  34         if (!tree_conn) {
  35                 status.ret = -ENOMEM;
  36                 goto out_error;
  37         }
  38
  39         tree_conn->id = ksmbd_acquire_tree_conn_id(sess);
  40         if (tree_conn->id < 0) {
  41                 status.ret = -EINVAL;
  42                 goto out_error;
  43         }
  44
  45         peer_addr = KSMBD_TCP_PEER_SOCKADDR(sess->conn);
  46         resp = ksmbd_ipc_tree_connect_request(sess,
  47                                               sc,
  48                                               tree_conn,
  49                                               peer_addr);
  50         if (!resp) {
  51                 status.ret = -EINVAL;
  52                 goto out_error;
  53         }
  54
  55         status.ret = resp->status;
  56         if (status.ret != KSMBD_TREE_CONN_STATUS_OK)
  57                 goto out_error;
  58
  59         tree_conn->flags = resp->connection_flags;
  60         tree_conn->user = sess->user;
  61         tree_conn->share_conf = sc;
  62         status.tree_conn = tree_conn;
  63
  64         ret = xa_err(xa_store(&sess->tree_conns, tree_conn->id, tree_conn,
  65                         GFP_KERNEL));
  66         if (ret) {
  67                 status.ret = -ENOMEM;
  68                 goto out_error;
  69         }
  70         kvfree(resp);
  71         return status;
  72
  73 out_error:
  74         if (tree_conn)
  75                 ksmbd_release_tree_conn_id(sess, tree_conn->id);
  76         ksmbd_share_config_put(sc);
  77         kfree(tree_conn);
  78         kvfree(resp);
  79         return status;
  80 }
  81
  82 int ksmbd_tree_conn_disconnect(struct ksmbd_session *sess,
  83                                struct ksmbd_tree_connect *tree_conn)
  84 {
  85         int ret;
  86
  87         ret = ksmbd_ipc_tree_disconnect_request(sess->id, tree_conn->id);
  88         ksmbd_release_tree_conn_id(sess, tree_conn->id);
  89         xa_erase(&sess->tree_conns, tree_conn->id);
  90         ksmbd_share_config_put(tree_conn->share_conf);
  91         kfree(tree_conn);
  92         return ret;
  93 }
  94
  95 struct ksmbd_tree_connect *ksmbd_tree_conn_lookup(struct ksmbd_session *sess,
  96                                                   unsigned int id)
  97 {
  98         return xa_load(&sess->tree_conns, id);
  99 }
 100
 101 struct ksmbd_share_config *ksmbd_tree_conn_share(struct ksmbd_session *sess,
 102                                                  unsigned int id)
 103 {
 104         struct ksmbd_tree_connect *tc;
 105
 106         tc = ksmbd_tree_conn_lookup(sess, id);
 107         if (tc)
 108                 return tc->share_conf;
 109         return NULL;
 110 }
 111
 112 int ksmbd_tree_conn_session_logoff(struct ksmbd_session *sess)
 113 {
 114         int ret = 0;
 115         struct ksmbd_tree_connect *tc;
 116         unsigned long id;
 117
 118         xa_for_each(&sess->tree_conns, id, tc)
 119                 ret |= ksmbd_tree_conn_disconnect(sess, tc);
 120         xa_destroy(&sess->tree_conns);
 121         return ret;
 122 }