kernel의 네트워크 계층에서 ip header가 포함된 packet을 가로채고 싶습니다.

socket(PF_PACKET , SOCK_DGRAM , htons(ETH_P_IP));
socket(PF_INET, SOCK_RAW, IPPROTO_RAW);

const int	buf_len		= 0xFFFF;
unsigned char	buffer[buf_len]	= {0,};
int		sock_packet	= 0;
int		recv_len	= 0;
struct iphdr*	hdr		= NULL;
void*		payload		= NULL;
 
sock_packet = socket(PF_PACKET , SOCK_DGRAM , htons(ETH_P_IP));
if(sock_packet < 0)
{
	perror("socket()");
	return -1;
}
 
rcv_len = recv(sock_packet , buffer , buf_len , 0);
 
hdr 	= (struct iphdr*)buffer;		/* ip header */
payload	= buffer + sizeof(struct iphdr);	/* ip payload */