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 "../transport_ipc.h" 11 #include "../connection.h" 12 #include "../stats.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_work *work, const char *share_name) 21 { 22 struct ksmbd_tree_conn_status status = {-ENOENT, 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 struct ksmbd_conn *conn = work->conn; 28 struct ksmbd_session *sess = work->sess; 29 int ret; 30 31 sc = ksmbd_share_config_get(work, share_name); 32 if (!sc) 33 return status; 34 35 tree_conn = kzalloc_obj(struct ksmbd_tree_connect, KSMBD_DEFAULT_GFP); 36 if (!tree_conn) { 37 status.ret = -ENOMEM; 38 goto out_error; 39 } 40 41 tree_conn->id = ksmbd_acquire_tree_conn_id(sess); 42 if (tree_conn->id < 0) { 43 status.ret = -EINVAL; 44 goto out_error; 45 } 46 47 peer_addr = KSMBD_TCP_PEER_SOCKADDR(conn); 48 resp = ksmbd_ipc_tree_connect_request(sess, 49 sc, 50 tree_conn, 51 peer_addr); 52 if (!resp) { 53 status.ret = -EINVAL; 54 goto out_error; 55 } 56 57 status.ret = resp->status; 58 if (status.ret != KSMBD_TREE_CONN_STATUS_OK) 59 goto out_error; 60 61 tree_conn->flags = resp->connection_flags; 62 if (test_tree_conn_flag(tree_conn, KSMBD_TREE_CONN_FLAG_UPDATE)) { 63 struct ksmbd_share_config *new_sc; 64 65 ksmbd_share_config_del(sc); 66 new_sc = ksmbd_share_config_get(work, share_name); 67 if (!new_sc) { 68 pr_err("Failed to update stale share config\n"); 69 status.ret = -ESTALE; 70 goto out_error; 71 } 72 ksmbd_share_config_put(sc); 73 sc = new_sc; 74 } 75 76 tree_conn->user = sess->user; 77 tree_conn->share_conf = sc; 78 tree_conn->t_state = TREE_NEW; 79 status.tree_conn = tree_conn; 80 atomic_set(&tree_conn->refcount, 1); 81 82 down_write(&sess->tree_conns_lock); 83 ret = xa_err(xa_store(&sess->tree_conns, tree_conn->id, tree_conn, 84 KSMBD_DEFAULT_GFP)); 85 up_write(&sess->tree_conns_lock); 86 if (ret) { 87 status.ret = -ENOMEM; 88 goto out_error; 89 } 90 ksmbd_counter_inc(KSMBD_COUNTER_TREE_CONNS); 91 kvfree(resp); 92 return status; 93 94 out_error: 95 if (tree_conn) 96 ksmbd_release_tree_conn_id(sess, tree_conn->id); 97 ksmbd_share_config_put(sc); 98 kfree(tree_conn); 99 kvfree(resp); 100 return status; 101 } 102 103 void ksmbd_tree_connect_put(struct ksmbd_tree_connect *tcon) 104 { 105 if (atomic_dec_and_test(&tcon->refcount)) 106 kfree(tcon); 107 } 108 109 static int __ksmbd_tree_conn_disconnect(struct ksmbd_session *sess, 110 struct ksmbd_tree_connect *tree_conn) 111 { 112 int ret; 113 114 ret = ksmbd_ipc_tree_disconnect_request(sess->id, tree_conn->id); 115 ksmbd_release_tree_conn_id(sess, tree_conn->id); 116 ksmbd_share_config_put(tree_conn->share_conf); 117 ksmbd_counter_dec(KSMBD_COUNTER_TREE_CONNS); 118 if (atomic_dec_and_test(&tree_conn->refcount)) 119 kfree(tree_conn); 120 return ret; 121 } 122 123 int ksmbd_tree_conn_disconnect(struct ksmbd_session *sess, 124 struct ksmbd_tree_connect *tree_conn) 125 { 126 down_write(&sess->tree_conns_lock); 127 xa_erase(&sess->tree_conns, tree_conn->id); 128 up_write(&sess->tree_conns_lock); 129 130 return __ksmbd_tree_conn_disconnect(sess, tree_conn); 131 } 132 133 struct ksmbd_tree_connect *ksmbd_tree_conn_lookup(struct ksmbd_session *sess, 134 unsigned int id) 135 { 136 struct ksmbd_tree_connect *tcon; 137 138 down_read(&sess->tree_conns_lock); 139 tcon = xa_load(&sess->tree_conns, id); 140 if (tcon) { 141 if (tcon->t_state != TREE_CONNECTED) 142 tcon = NULL; 143 else if (!atomic_inc_not_zero(&tcon->refcount)) 144 tcon = NULL; 145 } 146 up_read(&sess->tree_conns_lock); 147 148 return tcon; 149 } 150 151 int ksmbd_tree_conn_session_logoff(struct ksmbd_session *sess) 152 { 153 int ret = 0; 154 struct ksmbd_tree_connect *tc; 155 unsigned long id; 156 157 if (!sess) 158 return -EINVAL; 159 160 down_write(&sess->tree_conns_lock); 161 xa_for_each(&sess->tree_conns, id, tc) { 162 if (tc->t_state == TREE_DISCONNECTED) { 163 ret = -ENOENT; 164 continue; 165 } 166 tc->t_state = TREE_DISCONNECTED; 167 168 xa_erase(&sess->tree_conns, tc->id); 169 ret |= __ksmbd_tree_conn_disconnect(sess, tc); 170 } 171 xa_destroy(&sess->tree_conns); 172 up_write(&sess->tree_conns_lock); 173 174 return ret; 175 } 176