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1 | /* |
2 | * cn_test.c |
3 | * |
4 | * 2004+ Copyright (c) Evgeniy Polyakov <zbr@ioremap.net> |
5 | * All rights reserved. |
6 | * |
7 | * This program is free software; you can redistribute it and/or modify |
8 | * it under the terms of the GNU General Public License as published by |
9 | * the Free Software Foundation; either version 2 of the License, or |
10 | * (at your option) any later version. |
11 | * |
12 | * This program is distributed in the hope that it will be useful, |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
15 | * GNU General Public License for more details. |
16 | * |
17 | * You should have received a copy of the GNU General Public License |
18 | * along with this program; if not, write to the Free Software |
19 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
20 | */ |
21 | |
22 | #define pr_fmt(fmt) "cn_test: " fmt |
23 | |
24 | #include <linux/kernel.h> |
25 | #include <linux/module.h> |
26 | #include <linux/moduleparam.h> |
27 | #include <linux/skbuff.h> |
28 | #include <linux/slab.h> |
29 | #include <linux/timer.h> |
30 | |
31 | #include <linux/connector.h> |
32 | |
33 | static struct cb_id cn_test_id = { CN_NETLINK_USERS + 3, 0x456 }; |
34 | static char cn_test_name[] = "cn_test"; |
35 | static struct sock *nls; |
36 | static struct timer_list cn_test_timer; |
37 | |
38 | static void cn_test_callback(struct cn_msg *msg, struct netlink_skb_parms *nsp) |
39 | { |
40 | pr_info("%s: %lu: idx=%x, val=%x, seq=%u, ack=%u, len=%d: %s.\n", |
41 | __func__, jiffies, msg->id.idx, msg->id.val, |
42 | msg->seq, msg->ack, msg->len, |
43 | msg->len ? (char *)msg->data : ""); |
44 | } |
45 | |
46 | /* |
47 | * Do not remove this function even if no one is using it as |
48 | * this is an example of how to get notifications about new |
49 | * connector user registration |
50 | */ |
51 | #if 0 |
52 | static int cn_test_want_notify(void) |
53 | { |
54 | struct cn_ctl_msg *ctl; |
55 | struct cn_notify_req *req; |
56 | struct cn_msg *msg = NULL; |
57 | int size, size0; |
58 | struct sk_buff *skb; |
59 | struct nlmsghdr *nlh; |
60 | u32 group = 1; |
61 | |
62 | size0 = sizeof(*msg) + sizeof(*ctl) + 3 * sizeof(*req); |
63 | |
64 | size = NLMSG_SPACE(size0); |
65 | |
66 | skb = alloc_skb(size, GFP_ATOMIC); |
67 | if (!skb) { |
68 | pr_err("failed to allocate new skb with size=%u\n", size); |
69 | return -ENOMEM; |
70 | } |
71 | |
72 | nlh = NLMSG_PUT(skb, 0, 0x123, NLMSG_DONE, size - sizeof(*nlh)); |
73 | |
74 | msg = (struct cn_msg *)NLMSG_DATA(nlh); |
75 | |
76 | memset(msg, 0, size0); |
77 | |
78 | msg->id.idx = -1; |
79 | msg->id.val = -1; |
80 | msg->seq = 0x123; |
81 | msg->ack = 0x345; |
82 | msg->len = size0 - sizeof(*msg); |
83 | |
84 | ctl = (struct cn_ctl_msg *)(msg + 1); |
85 | |
86 | ctl->idx_notify_num = 1; |
87 | ctl->val_notify_num = 2; |
88 | ctl->group = group; |
89 | ctl->len = msg->len - sizeof(*ctl); |
90 | |
91 | req = (struct cn_notify_req *)(ctl + 1); |
92 | |
93 | /* |
94 | * Idx. |
95 | */ |
96 | req->first = cn_test_id.idx; |
97 | req->range = 10; |
98 | |
99 | /* |
100 | * Val 0. |
101 | */ |
102 | req++; |
103 | req->first = cn_test_id.val; |
104 | req->range = 10; |
105 | |
106 | /* |
107 | * Val 1. |
108 | */ |
109 | req++; |
110 | req->first = cn_test_id.val + 20; |
111 | req->range = 10; |
112 | |
113 | NETLINK_CB(skb).dst_group = ctl->group; |
114 | //netlink_broadcast(nls, skb, 0, ctl->group, GFP_ATOMIC); |
115 | netlink_unicast(nls, skb, 0, 0); |
116 | |
117 | pr_info("request was sent: group=0x%x\n", ctl->group); |
118 | |
119 | return 0; |
120 | |
121 | nlmsg_failure: |
122 | pr_err("failed to send %u.%u\n", msg->seq, msg->ack); |
123 | kfree_skb(skb); |
124 | return -EINVAL; |
125 | } |
126 | #endif |
127 | |
128 | static u32 cn_test_timer_counter; |
129 | static void cn_test_timer_func(unsigned long __data) |
130 | { |
131 | struct cn_msg *m; |
132 | char data[32]; |
133 | |
134 | pr_debug("%s: timer fired with data %lu\n", __func__, __data); |
135 | |
136 | m = kzalloc(sizeof(*m) + sizeof(data), GFP_ATOMIC); |
137 | if (m) { |
138 | |
139 | memcpy(&m->id, &cn_test_id, sizeof(m->id)); |
140 | m->seq = cn_test_timer_counter; |
141 | m->len = sizeof(data); |
142 | |
143 | m->len = |
144 | scnprintf(data, sizeof(data), "counter = %u", |
145 | cn_test_timer_counter) + 1; |
146 | |
147 | memcpy(m + 1, data, m->len); |
148 | |
149 | cn_netlink_send(m, 0, GFP_ATOMIC); |
150 | kfree(m); |
151 | } |
152 | |
153 | cn_test_timer_counter++; |
154 | |
155 | mod_timer(&cn_test_timer, jiffies + msecs_to_jiffies(1000)); |
156 | } |
157 | |
158 | static int cn_test_init(void) |
159 | { |
160 | int err; |
161 | |
162 | err = cn_add_callback(&cn_test_id, cn_test_name, cn_test_callback); |
163 | if (err) |
164 | goto err_out; |
165 | cn_test_id.val++; |
166 | err = cn_add_callback(&cn_test_id, cn_test_name, cn_test_callback); |
167 | if (err) { |
168 | cn_del_callback(&cn_test_id); |
169 | goto err_out; |
170 | } |
171 | |
172 | setup_timer(&cn_test_timer, cn_test_timer_func, 0); |
173 | mod_timer(&cn_test_timer, jiffies + msecs_to_jiffies(1000)); |
174 | |
175 | pr_info("initialized with id={%u.%u}\n", |
176 | cn_test_id.idx, cn_test_id.val); |
177 | |
178 | return 0; |
179 | |
180 | err_out: |
181 | if (nls && nls->sk_socket) |
182 | sock_release(nls->sk_socket); |
183 | |
184 | return err; |
185 | } |
186 | |
187 | static void cn_test_fini(void) |
188 | { |
189 | del_timer_sync(&cn_test_timer); |
190 | cn_del_callback(&cn_test_id); |
191 | cn_test_id.val--; |
192 | cn_del_callback(&cn_test_id); |
193 | if (nls && nls->sk_socket) |
194 | sock_release(nls->sk_socket); |
195 | } |
196 | |
197 | module_init(cn_test_init); |
198 | module_exit(cn_test_fini); |
199 | |
200 | MODULE_LICENSE("GPL"); |
201 | MODULE_AUTHOR("Evgeniy Polyakov <zbr@ioremap.net>"); |
202 | MODULE_DESCRIPTION("Connector's test module"); |
203 |
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