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cn_test.c

/*
 *    cn_test.c
 * 
 * 2004-2005 Copyright (c) Evgeniy Polyakov <johnpol@2ka.mipt.ru>
 * All rights reserved.
 * 
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/skbuff.h>
#include <linux/timer.h>

#include <linux/connector.h>

static struct cb_id cn_test_id = { 0x123, 0x456 };
static char cn_test_name[] = "cn_test";
static struct sock *nls;
static struct timer_list cn_test_timer;

void cn_test_callback(void *data)
{
      struct cn_msg *msg = (struct cn_msg *)data;

      printk("%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, (char *)msg->data);
}

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) {
            printk(KERN_ERR "Failed to allocate new skb with size=%u.\n",
                   size);

            return -ENOMEM;
      }

      nlh = NLMSG_PUT(skb, 0, 0x123, NLMSG_DONE, size - sizeof(*nlh));

      msg = (struct cn_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);

      printk(KERN_INFO "Request was sent. Group=0x%x.\n", ctl->group);

      return 0;

nlmsg_failure:
      printk(KERN_ERR "Failed to send %u.%u\n", msg->seq, msg->ack);
      kfree_skb(skb);
      return -EINVAL;
}

static u32 cn_test_timer_counter;
static void cn_test_timer_func(unsigned long __data)
{
      struct cn_msg *m;
      char data[32];

      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, gfp_any());
            kfree(m);
      }

      cn_test_timer_counter++;

      mod_timer(&cn_test_timer, jiffies + HZ);
}

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;
      }

      init_timer(&cn_test_timer);
      cn_test_timer.function = cn_test_timer_func;
      cn_test_timer.expires = jiffies + HZ;
      cn_test_timer.data = 0;
      add_timer(&cn_test_timer);

      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 <johnpol@2ka.mipt.ru>");
MODULE_DESCRIPTION("Connector's test module");

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