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