void sr_handlepacket(struct sr_instance* sr,
uint8_t * packet/* lent */,
unsigned int len,
char* interface/* lent */)
{
/* REQUIRES */
assert(sr);
assert(packet);
assert(interface);
printf("*** -> Received packet of length %d \n",len);
/* check length */
if (len < sizeof(sr_ethernet_hdr_t)) {
fprintf(stderr, "Failed to process ETHERNET header, insufficient length\n");
return;
}
sr_ethernet_hdr_t *eth_hdr = (sr_ethernet_hdr_t *)packet;
uint16_t ether_type = ntohs(eth_hdr->ether_type);
struct sr_if *iface = sr_get_interface(sr, interface);
if (ether_type == ethertype_ip) {
sr_handle_ip(sr, packet, len, iface);
} else if (ether_type == ethertype_arp) {
sr_handle_arp(sr, packet, len, iface);
}
}
void sr_handlepacket(struct sr_instance* sr,
uint8_t * packet/* lent */,
unsigned int len,
char* interface/* lent */)
{
/* REQUIRES */
assert(sr);
assert(packet);
assert(interface);
printf("*** -> Received packet of length %d \n",len);
/* Check packet type */
uint16_t ethtype = ethertype(packet);
unsigned int minlen = sizeof(sr_ethernet_hdr_t);
if (len < minlen) {
fprintf(stderr, "Invalid Ethernet frame size");
return;
}
switch(ethtype) {
case ethertype_arp:
Debug("Receive an ARP packet sent to interface %s\n", interface);
sr_handle_arp(sr, packet , len, interface);
break;
case ethertype_ip:
Debug("Get an IP header sent to interface: %s\n", interface);
sr_handle_ip(sr, packet, len, interface);
break;
default:
fprintf(stderr, "Unrecognized Ethernet Type: %d\n", ethtype);
break;
}
}/* end sr_ForwardPacket */