1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
|
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* cn_test.c
*
* 2004+ Copyright (c) Evgeniy Polyakov <zbr@ioremap.net>
* All rights reserved.
*/
#define pr_fmt(fmt) "cn_test: " fmt
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/skbuff.h>
#include <linux/slab.h>
#include <linux/timer.h>
#include <linux/connector.h>
static struct cb_id cn_test_id = { CN_NETLINK_USERS + 3, 0x456 };
static char cn_test_name[] = "cn_test";
static struct sock *nls;
static struct timer_list cn_test_timer;
static void cn_test_callback(struct cn_msg *msg, struct netlink_skb_parms *nsp)
{
pr_info("%s: %lu: idx=%x, val=%x, seq=%u, ack=%u, len=%d: %s.\n",
__func__, jiffies, msg->id.idx, msg->id.val,
msg->seq, msg->ack, msg->len,
msg->len ? (char *)msg->data : "");
}
/*
* Do not remove this function even if no one is using it as
* this is an example of how to get notifications about new
* connector user registration
*/
#if 0
static int cn_test_want_notify(void)
{
struct cn_ctl_msg *ctl;
struct cn_notify_req *req;
struct cn_msg *msg = NULL;
int size, size0;
struct sk_buff *skb;
struct nlmsghdr *nlh;
u32 group = 1;
size0 = sizeof(*msg) + sizeof(*ctl) + 3 * sizeof(*req);
size = NLMSG_SPACE(size0);
skb = alloc_skb(size, GFP_ATOMIC);
if (!skb) {
pr_err("failed to allocate new skb with size=%u\n", size);
return -ENOMEM;
}
nlh = nlmsg_put(skb, 0, 0x123, NLMSG_DONE, size - sizeof(*nlh), 0);
if (!nlh) {
kfree_skb(skb);
return -EMSGSIZE;
}
msg = nlmsg_data(nlh);
memset(msg, 0, size0);
msg->id.idx = -1;
msg->id.val = -1;
msg->seq = 0x123;
msg->ack = 0x345;
msg->len = size0 - sizeof(*msg);
ctl = (struct cn_ctl_msg *)(msg + 1);
ctl->idx_notify_num = 1;
ctl->val_notify_num = 2;
ctl->group = group;
ctl->len = msg->len - sizeof(*ctl);
req = (struct cn_notify_req *)(ctl + 1);
/*
* Idx.
*/
req->first = cn_test_id.idx;
req->range = 10;
/*
* Val 0.
*/
req++;
req->first = cn_test_id.val;
req->range = 10;
/*
* Val 1.
*/
req++;
req->first = cn_test_id.val + 20;
req->range = 10;
NETLINK_CB(skb).dst_group = ctl->group;
//netlink_broadcast(nls, skb, 0, ctl->group, GFP_ATOMIC);
netlink_unicast(nls, skb, 0, 0);
pr_info("request was sent: group=0x%x\n", ctl->group);
return 0;
}
#endif
static u32 cn_test_timer_counter;
static void cn_test_timer_func(struct timer_list *unused)
{
struct cn_msg *m;
char data[32];
pr_debug("%s: timer fired\n", __func__);
m = kzalloc(sizeof(*m) + sizeof(data), GFP_ATOMIC);
if (m) {
memcpy(&m->id, &cn_test_id, sizeof(m->id));
m->seq = cn_test_timer_counter;
m->len = sizeof(data);
m->len =
scnprintf(data, sizeof(data), "counter = %u",
cn_test_timer_counter) + 1;
memcpy(m + 1, data, m->len);
cn_netlink_send(m, 0, 0, GFP_ATOMIC);
kfree(m);
}
cn_test_timer_counter++;
mod_timer(&cn_test_timer, jiffies + msecs_to_jiffies(1000));
}
static int cn_test_init(void)
{
int err;
err = cn_add_callback(&cn_test_id, cn_test_name, cn_test_callback);
if (err)
goto err_out;
cn_test_id.val++;
err = cn_add_callback(&cn_test_id, cn_test_name, cn_test_callback);
if (err) {
cn_del_callback(&cn_test_id);
goto err_out;
}
timer_setup(&cn_test_timer, cn_test_timer_func, 0);
mod_timer(&cn_test_timer, jiffies + msecs_to_jiffies(1000));
pr_info("initialized with id={%u.%u}\n",
cn_test_id.idx, cn_test_id.val);
return 0;
err_out:
if (nls && nls->sk_socket)
sock_release(nls->sk_socket);
return err;
}
static void cn_test_fini(void)
{
del_timer_sync(&cn_test_timer);
cn_del_callback(&cn_test_id);
cn_test_id.val--;
cn_del_callback(&cn_test_id);
if (nls && nls->sk_socket)
sock_release(nls->sk_socket);
}
module_init(cn_test_init);
module_exit(cn_test_fini);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Evgeniy Polyakov <zbr@ioremap.net>");
MODULE_DESCRIPTION("Connector's test module");
|
