Documentation/connector/cn_test.c

   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 #include <linux/kernel.h>
  23 #include <linux/module.h>
  24 #include <linux/moduleparam.h>
  25 #include <linux/skbuff.h>
  26 #include <linux/timer.h>
  27
  28 #include <linux/connector.h>
  29
  30 static struct cb_id cn_test_id = { 0x123, 0x456 };
  31 static char cn_test_name[] = "cn_test";
  32 static struct sock *nls;
  33 static struct timer_list cn_test_timer;
  34
  35 static void cn_test_callback(struct cn_msg *msg, struct netlink_skb_parms *nsp)
  36 {
  37         printk("%s: %lu: idx=%x, val=%x, seq=%u, ack=%u, len=%d: %s.\n",
  38                __func__, jiffies, msg->id.idx, msg->id.val,
  39                msg->seq, msg->ack, msg->len, (char *)msg->data);
  40 }
  41
  42 /*
  43  * Do not remove this function even if no one is using it as
  44  * this is an example of how to get notifications about new
  45  * connector user registration
  46  */
  47 #if 0
  48 static int cn_test_want_notify(void)
  49 {
  50         struct cn_ctl_msg *ctl;
  51         struct cn_notify_req *req;
  52         struct cn_msg *msg = NULL;
  53         int size, size0;
  54         struct sk_buff *skb;
  55         struct nlmsghdr *nlh;
  56         u32 group = 1;
  57
  58         size0 = sizeof(*msg) + sizeof(*ctl) + 3 * sizeof(*req);
  59
  60         size = NLMSG_SPACE(size0);
  61
  62         skb = alloc_skb(size, GFP_ATOMIC);
  63         if (!skb) {
  64                 printk(KERN_ERR "Failed to allocate new skb with size=%u.\n",
  65                        size);
  66
  67                 return -ENOMEM;
  68         }
  69
  70         nlh = NLMSG_PUT(skb, 0, 0x123, NLMSG_DONE, size - sizeof(*nlh));
  71
  72         msg = (struct cn_msg *)NLMSG_DATA(nlh);
  73
  74         memset(msg, 0, size0);
  75
  76         msg->id.idx = -1;
  77         msg->id.val = -1;
  78         msg->seq = 0x123;
  79         msg->ack = 0x345;
  80         msg->len = size0 - sizeof(*msg);
  81
  82         ctl = (struct cn_ctl_msg *)(msg + 1);
  83
  84         ctl->idx_notify_num = 1;
  85         ctl->val_notify_num = 2;
  86         ctl->group = group;
  87         ctl->len = msg->len - sizeof(*ctl);
  88
  89         req = (struct cn_notify_req *)(ctl + 1);
  90
  91         /*
  92          * Idx.
  93          */
  94         req->first = cn_test_id.idx;
  95         req->range = 10;
  96
  97         /*
  98          * Val 0.
  99          */
 100         req++;
 101         req->first = cn_test_id.val;
 102         req->range = 10;
 103
 104         /*
 105          * Val 1.
 106          */
 107         req++;
 108         req->first = cn_test_id.val + 20;
 109         req->range = 10;
 110
 111         NETLINK_CB(skb).dst_group = ctl->group;
 112         //netlink_broadcast(nls, skb, 0, ctl->group, GFP_ATOMIC);
 113         netlink_unicast(nls, skb, 0, 0);
 114
 115         printk(KERN_INFO "Request was sent. Group=0x%x.\n", ctl->group);
 116
 117         return 0;
 118
 119 nlmsg_failure:
 120         printk(KERN_ERR "Failed to send %u.%u\n", msg->seq, msg->ack);
 121         kfree_skb(skb);
 122         return -EINVAL;
 123 }
 124 #endif
 125
 126 static u32 cn_test_timer_counter;
 127 static void cn_test_timer_func(unsigned long __data)
 128 {
 129         struct cn_msg *m;
 130         char data[32];
 131
 132         m = kzalloc(sizeof(*m) + sizeof(data), GFP_ATOMIC);
 133         if (m) {
 134
 135                 memcpy(&m->id, &cn_test_id, sizeof(m->id));
 136                 m->seq = cn_test_timer_counter;
 137                 m->len = sizeof(data);
 138
 139                 m->len =
 140                     scnprintf(data, sizeof(data), "counter = %u",
 141                               cn_test_timer_counter) + 1;
 142
 143                 memcpy(m + 1, data, m->len);
 144
 145                 cn_netlink_send(m, 0, GFP_ATOMIC);
 146                 kfree(m);
 147         }
 148
 149         cn_test_timer_counter++;
 150
 151         mod_timer(&cn_test_timer, jiffies + HZ);
 152 }
 153
 154 static int cn_test_init(void)
 155 {
 156         int err;
 157
 158         err = cn_add_callback(&cn_test_id, cn_test_name, cn_test_callback);
 159         if (err)
 160                 goto err_out;
 161         cn_test_id.val++;
 162         err = cn_add_callback(&cn_test_id, cn_test_name, cn_test_callback);
 163         if (err) {
 164                 cn_del_callback(&cn_test_id);
 165                 goto err_out;
 166         }
 167
 168         setup_timer(&cn_test_timer, cn_test_timer_func, 0);
 169         cn_test_timer.expires = jiffies + HZ;
 170         add_timer(&cn_test_timer);
 171
 172         return 0;
 173
 174       err_out:
 175         if (nls && nls->sk_socket)
 176                 sock_release(nls->sk_socket);
 177
 178         return err;
 179 }
 180
 181 static void cn_test_fini(void)
 182 {
 183         del_timer_sync(&cn_test_timer);
 184         cn_del_callback(&cn_test_id);
 185         cn_test_id.val--;
 186         cn_del_callback(&cn_test_id);
 187         if (nls && nls->sk_socket)
 188                 sock_release(nls->sk_socket);
 189 }
 190
 191 module_init(cn_test_init);
 192 module_exit(cn_test_fini);
 193
 194 MODULE_LICENSE("GPL");
 195 MODULE_AUTHOR("Evgeniy Polyakov <zbr@ioremap.net>");
 196 MODULE_DESCRIPTION("Connector's test module");