tag	line	file	source code
IPPROTO_ICMP	239	net/ipv4/icmp.c	daddr, saddr, &icmp_param->replyopts, 0, IPPROTO_ICMP, 1);
IPPROTO_ICMP	300	net/ipv4/icmp.c	if(iph->protocol==IPPROTO_ICMP)
IPPROTO_ICMP	746	net/ipv4/icmp.c	if((err=ops->create(&icmp_socket, IPPROTO_ICMP))<0)
IPPROTO_ICMP	293	net/ipv4/ip_fw.c	case IPPROTO_ICMP:
IPPROTO_ICMP	443	net/ipv4/ip_fw.c	case IPPROTO_ICMP:
IPPROTO_ICMP	100	net/ipv4/protocol.c	IPPROTO_ICMP,    /* protocol ID    */