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
ksmbd_tree_conn_connect(struct ksmbd_conn * conn,struct ksmbd_session * sess,const char * share_name)19 ksmbd_tree_conn_connect(struct ksmbd_conn *conn, struct ksmbd_session *sess,
20 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 int ret;
28
29 sc = ksmbd_share_config_get(conn->um, 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(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 if (test_tree_conn_flag(tree_conn, KSMBD_TREE_CONN_FLAG_UPDATE)) {
61 struct ksmbd_share_config *new_sc;
62
63 ksmbd_share_config_del(sc);
64 new_sc = ksmbd_share_config_get(conn->um, share_name);
65 if (!new_sc) {
66 pr_err("Failed to update stale share config\n");
67 status.ret = -ESTALE;
68 goto out_error;
69 }
70 ksmbd_share_config_put(sc);
71 sc = new_sc;
72 }
73
74 tree_conn->user = sess->user;
75 tree_conn->share_conf = sc;
76 status.tree_conn = tree_conn;
77
78 ret = xa_err(xa_store(&sess->tree_conns, tree_conn->id, tree_conn,
79 GFP_KERNEL));
80 if (ret) {
81 status.ret = -ENOMEM;
82 goto out_error;
83 }
84 kvfree(resp);
85 return status;
86
87 out_error:
88 if (tree_conn)
89 ksmbd_release_tree_conn_id(sess, tree_conn->id);
90 ksmbd_share_config_put(sc);
91 kfree(tree_conn);
92 kvfree(resp);
93 return status;
94 }
95
ksmbd_tree_conn_disconnect(struct ksmbd_session * sess,struct ksmbd_tree_connect * tree_conn)96 int ksmbd_tree_conn_disconnect(struct ksmbd_session *sess,
97 struct ksmbd_tree_connect *tree_conn)
98 {
99 int ret;
100
101 ret = ksmbd_ipc_tree_disconnect_request(sess->id, tree_conn->id);
102 ksmbd_release_tree_conn_id(sess, tree_conn->id);
103 xa_erase(&sess->tree_conns, tree_conn->id);
104 ksmbd_share_config_put(tree_conn->share_conf);
105 kfree(tree_conn);
106 return ret;
107 }
108
ksmbd_tree_conn_lookup(struct ksmbd_session * sess,unsigned int id)109 struct ksmbd_tree_connect *ksmbd_tree_conn_lookup(struct ksmbd_session *sess,
110 unsigned int id)
111 {
112 return xa_load(&sess->tree_conns, id);
113 }
114
ksmbd_tree_conn_share(struct ksmbd_session * sess,unsigned int id)115 struct ksmbd_share_config *ksmbd_tree_conn_share(struct ksmbd_session *sess,
116 unsigned int id)
117 {
118 struct ksmbd_tree_connect *tc;
119
120 tc = ksmbd_tree_conn_lookup(sess, id);
121 if (tc)
122 return tc->share_conf;
123 return NULL;
124 }
125
ksmbd_tree_conn_session_logoff(struct ksmbd_session * sess)126 int ksmbd_tree_conn_session_logoff(struct ksmbd_session *sess)
127 {
128 int ret = 0;
129 struct ksmbd_tree_connect *tc;
130 unsigned long id;
131
132 xa_for_each(&sess->tree_conns, id, tc)
133 ret |= ksmbd_tree_conn_disconnect(sess, tc);
134 xa_destroy(&sess->tree_conns);
135 return ret;
136 }
137