ksmbd/mgmt/tree_connect.c

0001 // SPDX-License-Identifier: GPL-2.0-or-later
0002 /*
0003  *   Copyright (C) 2018 Samsung Electronics Co., Ltd.
0004  */
0005
0006 #include <linux/list.h>
0007 #include <linux/slab.h>
0008 #include <linux/xarray.h>
0009
0010 #include "../transport_ipc.h"
0011 #include "../connection.h"
0012
0013 #include "tree_connect.h"
0014 #include "user_config.h"
0015 #include "share_config.h"
0016 #include "user_session.h"
0017
0018 struct ksmbd_tree_conn_status
0019 ksmbd_tree_conn_connect(struct ksmbd_conn *conn, struct ksmbd_session *sess,
0020             char *share_name)
0021 {
0022     struct ksmbd_tree_conn_status status = {-ENOENT, NULL};
0023     struct ksmbd_tree_connect_response *resp = NULL;
0024     struct ksmbd_share_config *sc;
0025     struct ksmbd_tree_connect *tree_conn = NULL;
0026     struct sockaddr *peer_addr;
0027     int ret;
0028
0029     sc = ksmbd_share_config_get(share_name);
0030     if (!sc)
0031         return status;
0032
0033     tree_conn = kzalloc(sizeof(struct ksmbd_tree_connect), GFP_KERNEL);
0034     if (!tree_conn) {
0035         status.ret = -ENOMEM;
0036         goto out_error;
0037     }
0038
0039     tree_conn->id = ksmbd_acquire_tree_conn_id(sess);
0040     if (tree_conn->id < 0) {
0041         status.ret = -EINVAL;
0042         goto out_error;
0043     }
0044
0045     peer_addr = KSMBD_TCP_PEER_SOCKADDR(conn);
0046     resp = ksmbd_ipc_tree_connect_request(sess,
0047                           sc,
0048                           tree_conn,
0049                           peer_addr);
0050     if (!resp) {
0051         status.ret = -EINVAL;
0052         goto out_error;
0053     }
0054
0055     status.ret = resp->status;
0056     if (status.ret != KSMBD_TREE_CONN_STATUS_OK)
0057         goto out_error;
0058
0059     tree_conn->flags = resp->connection_flags;
0060     if (test_tree_conn_flag(tree_conn, KSMBD_TREE_CONN_FLAG_UPDATE)) {
0061         struct ksmbd_share_config *new_sc;
0062
0063         ksmbd_share_config_del(sc);
0064         new_sc = ksmbd_share_config_get(share_name);
0065         if (!new_sc) {
0066             pr_err("Failed to update stale share config\n");
0067             status.ret = -ESTALE;
0068             goto out_error;
0069         }
0070         ksmbd_share_config_put(sc);
0071         sc = new_sc;
0072     }
0073
0074     tree_conn->user = sess->user;
0075     tree_conn->share_conf = sc;
0076     status.tree_conn = tree_conn;
0077
0078     ret = xa_err(xa_store(&sess->tree_conns, tree_conn->id, tree_conn,
0079                   GFP_KERNEL));
0080     if (ret) {
0081         status.ret = -ENOMEM;
0082         goto out_error;
0083     }
0084     kvfree(resp);
0085     return status;
0086
0087 out_error:
0088     if (tree_conn)
0089         ksmbd_release_tree_conn_id(sess, tree_conn->id);
0090     ksmbd_share_config_put(sc);
0091     kfree(tree_conn);
0092     kvfree(resp);
0093     return status;
0094 }
0095
0096 int ksmbd_tree_conn_disconnect(struct ksmbd_session *sess,
0097                    struct ksmbd_tree_connect *tree_conn)
0098 {
0099     int ret;
0100
0101     ret = ksmbd_ipc_tree_disconnect_request(sess->id, tree_conn->id);
0102     ksmbd_release_tree_conn_id(sess, tree_conn->id);
0103     xa_erase(&sess->tree_conns, tree_conn->id);
0104     ksmbd_share_config_put(tree_conn->share_conf);
0105     kfree(tree_conn);
0106     return ret;
0107 }
0108
0109 struct ksmbd_tree_connect *ksmbd_tree_conn_lookup(struct ksmbd_session *sess,
0110                           unsigned int id)
0111 {
0112     return xa_load(&sess->tree_conns, id);
0113 }
0114
0115 struct ksmbd_share_config *ksmbd_tree_conn_share(struct ksmbd_session *sess,
0116                          unsigned int id)
0117 {
0118     struct ksmbd_tree_connect *tc;
0119
0120     tc = ksmbd_tree_conn_lookup(sess, id);
0121     if (tc)
0122         return tc->share_conf;
0123     return NULL;
0124 }
0125
0126 int ksmbd_tree_conn_session_logoff(struct ksmbd_session *sess)
0127 {
0128     int ret = 0;
0129     struct ksmbd_tree_connect *tc;
0130     unsigned long id;
0131
0132     xa_for_each(&sess->tree_conns, id, tc)
0133         ret |= ksmbd_tree_conn_disconnect(sess, tc);
0134     xa_destroy(&sess->tree_conns);
0135     return ret;
0136 }