/*!
* \brief Send an ICMP message to a given destination.
*
* \param type Type of the ICMP message. See NutIcmpOutput() for
* a list of valid types.
* \param code Type subcode.
* \param spec Type specific data item.
* \param dest IP address of the target.
* \param nb Network buffer structure containing the message to be sent.
* The structure must have been allocated by a previous
* call NutNetBufAlloc() and will be freed if this function
* returns with an error.
*
* \return 0 on success, -1 otherwise.
*/
int NutIcmpReply(uint8_t type, uint8_t code, uint32_t spec, uint32_t dest, NETBUF * nb)
{
ICMPHDR *icp;
if ((nb = NutNetBufAlloc(nb, NBAF_TRANSPORT, sizeof(ICMPHDR))) == 0)
return -1;
icp = (ICMPHDR *) nb->nb_tp.vp;
icp->icmp_code = code;
icp->icmp_spec = spec;
return NutIcmpOutput(type, dest, nb);
}
/*
* Send out ICMP echo response.
*/
static int NutIcmpReflect(NUTDEVICE * dev, u_char type, NETBUF * nb)
{
IPHDR *ip;
ICMPHDR *icmp;
u_long dest;
IFNET *nif;
ip = nb->nb_nw.vp;
icmp = nb->nb_tp.vp;
dest = ip->ip_src;
nif = dev->dev_icb;
ip->ip_src = nif->if_local_ip;
ip->ip_ttl = MAXTTL;
return NutIcmpOutput(type, dest, nb);
}
