Documentation/connector/cn_test.c

   1 /*
   2  *      cn_test.c
   3  *
   4  * 2004-2005 Copyright (c) Evgeniy Polyakov <johnpol@2ka.mipt.ru>
   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 void cn_test_callback(void *data)
  36 {
  37         struct cn_msg *msg = (struct cn_msg *)data;
  38
  39         printk("%s: %lu: idx=%x, val=%x, seq=%u, ack=%u, len=%d: %s.\n",
  40                __func__, jiffies, msg->id.idx, msg->id.val,
  41                msg->seq, msg->ack, msg->len, (char *)msg->data);
  42 }
  43
  44 static int cn_test_want_notify(void)
  45 {
  46         struct cn_ctl_msg *ctl;
  47         struct cn_notify_req *req;
  48         struct cn_msg *msg = NULL;
  49         int size, size0;
  50         struct sk_buff *skb;
  51         struct nlmsghdr *nlh;
  52         u32 group = 1;
  53
  54         size0 = sizeof(*msg) + sizeof(*ctl) + 3 * sizeof(*req);
  55
  56         size = NLMSG_SPACE(size0);
  57
  58         skb = alloc_skb(size, GFP_ATOMIC);
  59         if (!skb) {
  60                 printk(KERN_ERR "Failed to allocate new skb with size=%u.\n",
  61                        size);
  62
  63                 return -ENOMEM;
  64         }
  65
  66         nlh = NLMSG_PUT(skb, 0, 0x123, NLMSG_DONE, size - sizeof(*nlh));
  67
  68         msg = (struct cn_msg *)NLMSG_DATA(nlh);
  69
  70         memset(msg, 0, size0);
  71
  72         msg->id.idx = -1;
  73         msg->id.val = -1;
  74         msg->seq = 0x123;
  75         msg->ack = 0x345;
  76         msg->len = size0 - sizeof(*msg);
  77
  78         ctl = (struct cn_ctl_msg *)(msg + 1);
  79
  80         ctl->idx_notify_num = 1;
  81         ctl->val_notify_num = 2;
  82         ctl->group = group;
  83         ctl->len = msg->len - sizeof(*ctl);
  84
  85         req = (struct cn_notify_req *)(ctl + 1);
  86
  87         /*
  88          * Idx.
  89          */
  90         req->first = cn_test_id.idx;
  91         req->range = 10;
  92
  93         /*
  94          * Val 0.
  95          */
  96         req++;
  97         req->first = cn_test_id.val;
  98         req->range = 10;
  99
 100         /*
 101          * Val 1.
 102          */
 103         req++;
 104         req->first = cn_test_id.val + 20;
 105         req->range = 10;
 106
 107         NETLINK_CB(skb).dst_group = ctl->group;
 108         //netlink_broadcast(nls, skb, 0, ctl->group, GFP_ATOMIC);
 109         netlink_unicast(nls, skb, 0, 0);
 110
 111         printk(KERN_INFO "Request was sent. Group=0x%x.\n", ctl->group);
 112
 113         return 0;
 114
 115 nlmsg_failure:
 116         printk(KERN_ERR "Failed to send %u.%u\n", msg->seq, msg->ack);
 117         kfree_skb(skb);
 118         return -EINVAL;
 119 }
 120
 121 static u32 cn_test_timer_counter;
 122 static void cn_test_timer_func(unsigned long __data)
 123 {
 124         struct cn_msg *m;
 125         char data[32];
 126
 127         m = kzalloc(sizeof(*m) + sizeof(data), GFP_ATOMIC);
 128         if (m) {
 129
 130                 memcpy(&m->id, &cn_test_id, sizeof(m->id));
 131                 m->seq = cn_test_timer_counter;
 132                 m->len = sizeof(data);
 133
 134                 m->len =
 135                     scnprintf(data, sizeof(data), "counter = %u",
 136                               cn_test_timer_counter) + 1;
 137
 138                 memcpy(m + 1, data, m->len);
 139
 140                 cn_netlink_send(m, 0, gfp_any());
 141                 kfree(m);
 142         }
 143
 144         cn_test_timer_counter++;
 145
 146         mod_timer(&cn_test_timer, jiffies + HZ);
 147 }
 148
 149 static int cn_test_init(void)
 150 {
 151         int err;
 152
 153         err = cn_add_callback(&cn_test_id, cn_test_name, cn_test_callback);
 154         if (err)
 155                 goto err_out;
 156         cn_test_id.val++;
 157         err = cn_add_callback(&cn_test_id, cn_test_name, cn_test_callback);
 158         if (err) {
 159                 cn_del_callback(&cn_test_id);
 160                 goto err_out;
 161         }
 162
 163         init_timer(&cn_test_timer);
 164         cn_test_timer.function = cn_test_timer_func;
 165         cn_test_timer.expires = jiffies + HZ;
 166         cn_test_timer.data = 0;
 167         add_timer(&cn_test_timer);
 168
 169         return 0;
 170
 171       err_out:
 172         if (nls && nls->sk_socket)
 173                 sock_release(nls->sk_socket);
 174
 175         return err;
 176 }
 177
 178 static void cn_test_fini(void)
 179 {
 180         del_timer_sync(&cn_test_timer);
 181         cn_del_callback(&cn_test_id);
 182         cn_test_id.val--;
 183         cn_del_callback(&cn_test_id);
 184         if (nls && nls->sk_socket)
 185                 sock_release(nls->sk_socket);
 186 }
 187
 188 module_init(cn_test_init);
 189 module_exit(cn_test_fini);
 190
 191 MODULE_LICENSE("GPL");
 192 MODULE_AUTHOR("Evgeniy Polyakov <johnpol@2ka.mipt.ru>");
 193 MODULE_DESCRIPTION("Connector's test module");