ICMPv6 패킷 수신

#include <stdio.h>
#include <unistd.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/icmp6.h>

int main(int argc, char *argv[])
{
 int sd;
 int on;
 int status;
 struct icmp6_hdr  icmpv6={0};
 sd = socket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6);
 if (sd < 0)
 {
  perror ("Failed to get socket descriptor ");
  return -2;
 }
on = 1;
 if ((status = setsockopt (sd, IPPROTO_IPV6, IPV6_RECVHOPLIMIT, &on, sizeof (on))) < 0) {
   perror ("setsockopt to IPV6_RECVHOPLIMIT failed ");
   return -1;
}
 status = recv(sd, &icmpv6, sizeof(struct icmp6_hdr), 0);
 if (status < 0)
 {
  perror ("recv error ");
  return -1;
 }
 printf("icmpv6 type:%d\n", icmpv6.icmp6_type);
 close(sd);
 return 0;
}