#include "all.h"#include "mem.h" #include "../ip/ip.h" enum			/* Packet Types */{	EchoReply	= 0,	Unreachable	= 3,	SrcQuench	= 4,	EchoRequest	= 8,	TimeExceed	= 11,	Timestamp	= 13,	TimestampReply	= 14,	InfoRequest	= 15,	InfoReply	= 16,}; voidicmprecv(Msgbuf *mb, Ifc *ifc){	Icmppkt *p;	uchar tmp[Pasize]; 	p = (Icmppkt*)mb->data; 	switch(p->icmptype) {	default:		goto drop; 	case EchoRequest:		memmove(tmp, p->src, Pasize);		memmove(p->src, p->dst, Pasize);		memmove(p->dst, tmp, Pasize);		p->icmptype = EchoReply;		p->icmpsum[0] = 0;		p->icmpsum[1] = 0;		hnputs(p->icmpsum,			ptclcsum((uchar*)mb->data+(Ensize+Ipsize),				mb->count-(Ensize+Ipsize))); 		/* note that tmp contains dst */		if((nhgetl(ifc->ipa)&ifc->mask) != (nhgetl(p->dst)&ifc->mask))			iproute(tmp, p->dst, ifc->netgate);		ipsend1(mb, ifc, tmp);		break;	}	return; drop:	mbfree(mb);} voidigmprecv(Msgbuf *mb, Ifc*){	mbfree(mb);} voidtcprecv(Msgbuf *mb, Ifc*){	mbfree(mb);}