/**
* \brief output max payload size for a link
*
* This does a best effort to find the maximum packet size
* for the link. In case of uncertainty, it will output a
* majorant to be sure avoid the cost of dynamic allocation.
*
* \param Name of a network interface
* \retval 0 in case of error
*/
int GetIfaceMaxPayloadSize(char *pcap_dev)
{
int ll_header = GetIfaceMaxHWHeaderLength(pcap_dev);
int mtu = GetIfaceMTU(pcap_dev);
switch (mtu) {
case 0:
case -1:
return 0;
}
if (ll_header == -1) {
/* be conservative, choose a big one */
ll_header = 16;
}
return ll_header + mtu;
}
/**
* \brief output max packet size for a link
*
* This does a best effort to find the maximum packet size
* for the link. In case of uncertainty, it will output a
* majorant to be sure avoid the cost of dynamic allocation.
*
* \param Name of a network interface
* \retval 0 in case of error
*/
int GetIfaceMaxPacketSize(const char *pcap_dev)
{
if ((pcap_dev == NULL) || strlen(pcap_dev) == 0)
return 0;
int mtu = GetIfaceMTU(pcap_dev);
switch (mtu) {
case 0:
case -1:
return 0;
}
int ll_header = GetIfaceMaxHWHeaderLength(pcap_dev);
if (ll_header == -1) {
/* be conservative, choose a big one */
ll_header = 16;
}
return ll_header + mtu;
}
