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标题: 求助:netlink 中 netlink_kernel_create()中的回调INPUT [打印本页]

作者: Fart_King 时间: 2014-08-26 09:21
标题: 求助:netlink 中 netlink_kernel_create()中的回调INPUT
这个回调函数总是不调用 netlink_kernel_create()函数已经返回socket成功。
但挂载模块后 INPUT这个回调总不调用。

代码:

void input(struct sock *sk, int nlen)
{
printk("\n\nIs Enter CALLBACK FUNCTION \n");
if ( !p_content )
{
printk("p_content is null \n");
return;
}
struct sk_buff *skb;
  struct nlmsghdr *nlh;
  u32 pid;
  int rc, err;
  int len = NLMSG_SPACE(1200);
  char str[100];
  printk("net_link: data is ready to read.\n");
  skb = skb_recv_datagram(nl_sk, 0, 0, &err);
  if (skb->len >= NLMSG_SPACE(0)) {
nlh = nlmsg_hdr(skb);
printk("net_link: recv %s.\n", (char *)NLMSG_DATA(nlh));
memcpy(str,NLMSG_DATA(nlh), sizeof(str));
pid = nlh->nlmsg_pid; //pid of sending process
printk("net_link: pid is %d\n", pid);
kfree_skb(skb);
skb = alloc_skb(len, GFP_ATOMIC);
if (!skb){
   printk(KERN_ERR "net_link: allocate failed.\n");
   return;
}
nlh = nlmsg_put(skb,0,0,0,1200,0);
NETLINK_CB(skb).pid = 0; // from kernel
memcpy(NLMSG_DATA(nlh), p_content, sizeof(p_content));

printk("net_link: going to send.\n");
rc = netlink_unicast(nl_sk, skb, pid, MSG_DONTWAIT);
memset(p_content, 0, 1024);
if (rc < 0) {
   printk(KERN_ERR "net_link: can not unicast skb (%d)\n", rc);
}
printk("net_link: send is ok.\n");
  }
}

static int test_netlink(void) {
  nl_sk = netlink_kernel_create( &init_net, NETLINK_TEST, 0, input, NULL, THIS_MODULE);
  if (!nl_sk) {
printk(KERN_ERR "net_link: Cannot create netlink socket.\n");
return -EIO;
  }
  printk("net_link: create socket ok.\n");
  return 0;
}

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