커널에 전송층 프로토콜을 추가하려고 합니다.

#define IPPROTO_SDP 137 
 
static struct net_protocol sdp_protocol = {
  .handler = sdp_rcv,
  .err_handler = sdp_err,
  .no_policy = 1,
};
 
struct proto 	sdp_prot = {
	.name		   = "SDP",
	.owner		   = THIS_MODULE,
	.close		   = udp_lib_close,
	.connect	   = ip4_datagram_connect,
	.disconnect	   = udp_disconnect,
	.ioctl		   = udp_ioctl,
	.init		   = udplite_sk_init,
	.destroy	   = udp_destroy_sock,
	.setsockopt	   = udp_setsockopt,
	.getsockopt	   = udp_getsockopt,
	.sendmsg	   = sdp_sendmsg,
	.recvmsg	   = sdp_recvmsg,
	.sendpage	   = udp_sendpage,
	.backlog_rcv	   = udp_queue_rcv_skb,
	.hash		   = udp_lib_hash,
	.unhash		   = udp_lib_unhash,
	.get_port	   = udplite_v4_get_port,
	.obj_size	   = sizeof(struct udp_sock),
};
 
static struct inet_protosw sdp_inetsw = {
  .type = SOCK_DGRAM,
  .protocol = IPPROTO_SDP,
  .prot = &sdp_prot,
  .ops = &inet_dgram_ops,
  .capability = -1,
  .no_check = 0,
  .flags = INET_PROTOSW_PERMANENT,
};
 
int __init sdp_init(void)
{
  if(proto_register(&sdp_prot, 1))
    printk("proto_register error\n");
 
  if(inet_add_protocol(&sdp_protocol, IPPROTO_SDP) < 0) {
    printk("inet_add_protocol error\n");
    proto_unregister(&sdp_prot);
  }
 
  inet_register_protosw(&sdp_inetsw);
 
  return 0;
 
}
 
void __exit sdp_exit(void)
{
  proto_unregisteer(&sdp_prot);
  inet_del_protocol(&sdp_protocol, IPPROTO_SDP);
}
 
module_init(sdp_init);
module_exit(sdp_exit);