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 13 #include "tree_connect.h" 14 #include "user_config.h" 15 #include "share_config.h" 16 #include "user_session.h" 17 18 struct ksmbd_tree_conn_status 19 ksmbd_tree_conn_connect(struct ksmbd_work *work, const char *share_name) 20 { 21 struct ksmbd_tree_conn_status status = {-ENOENT, NULL}; 22 struct ksmbd_tree_connect_response *resp = NULL; 23 struct ksmbd_share_config *sc; 24 struct ksmbd_tree_connect *tree_conn = NULL; 25 struct sockaddr *peer_addr; 26 struct ksmbd_conn *conn = work->conn; 27 struct ksmbd_session *sess = work->sess; 28 int ret; 29 30 sc = ksmbd_share_config_get(work, share_name); 31 if (!sc) 32 return status; 33 34 tree_conn = kzalloc(sizeof(struct ksmbd_tree_connect), 35 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 ret = xa_err(xa_store(&sess->tree_conns, tree_conn->id, tree_conn, 83 KSMBD_DEFAULT_GFP)); 84 if (ret) { 85 status.ret = -ENOMEM; 86 goto out_error; 87 } 88 kvfree(resp); 89 return status; 90 91 out_error: 92 if (tree_conn) 93 ksmbd_release_tree_conn_id(sess, tree_conn->id); 94 ksmbd_share_config_put(sc); 95 kfree(tree_conn); 96 kvfree(resp); 97 return status; 98 } 99 100 void ksmbd_tree_connect_put(struct ksmbd_tree_connect *tcon) 101 { 102 if (atomic_dec_and_test(&tcon->refcount)) 103 kfree(tcon); 104 } 105 106 int ksmbd_tree_conn_disconnect(struct ksmbd_session *sess, 107 struct ksmbd_tree_connect *tree_conn) 108 { 109 int ret; 110 111 write_lock(&sess->tree_conns_lock); 112 xa_erase(&sess->tree_conns, tree_conn->id); 113 write_unlock(&sess->tree_conns_lock); 114 115 ret = ksmbd_ipc_tree_disconnect_request(sess->id, tree_conn->id); 116 ksmbd_release_tree_conn_id(sess, tree_conn->id); 117 ksmbd_share_config_put(tree_conn->share_conf); 118 if (atomic_dec_and_test(&tree_conn->refcount)) 119 kfree(tree_conn); 120 return ret; 121 } 122 123 struct ksmbd_tree_connect *ksmbd_tree_conn_lookup(struct ksmbd_session *sess, 124 unsigned int id) 125 { 126 struct ksmbd_tree_connect *tcon; 127 128 read_lock(&sess->tree_conns_lock); 129 tcon = xa_load(&sess->tree_conns, id); 130 if (tcon) { 131 if (tcon->t_state != TREE_CONNECTED) 132 tcon = NULL; 133 else if (!atomic_inc_not_zero(&tcon->refcount)) 134 tcon = NULL; 135 } 136 read_unlock(&sess->tree_conns_lock); 137 138 return tcon; 139 } 140 141 int ksmbd_tree_conn_session_logoff(struct ksmbd_session *sess) 142 { 143 int ret = 0; 144 struct ksmbd_tree_connect *tc; 145 unsigned long id; 146 147 if (!sess) 148 return -EINVAL; 149 150 xa_for_each(&sess->tree_conns, id, tc) { 151 write_lock(&sess->tree_conns_lock); 152 if (tc->t_state == TREE_DISCONNECTED) { 153 write_unlock(&sess->tree_conns_lock); 154 ret = -ENOENT; 155 continue; 156 } 157 tc->t_state = TREE_DISCONNECTED; 158 write_unlock(&sess->tree_conns_lock); 159 160 ret |= ksmbd_tree_conn_disconnect(sess, tc); 161 } 162 xa_destroy(&sess->tree_conns); 163 return ret; 164 } 165