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);
/* fill in code here */
/* check if header has the correct size */
if (len < sizeof(sr_ethernet_hdr_t)) {
fprintf(stderr, "Error: invalid packet length (ether_hdr)\n");
return;
}
if (len > 1500) {
fprintf(stderr, "Error: packet length longer than MTU(ether_hdr)");
return;
}
switch (ethertype(packet)) {
/* ------------- Handling ARP -------------------- */
case ethertype_arp:
sr_handlearp(sr, packet, len, interface);
break;
/* ------------- Handling IP -------------------- */
case ethertype_ip:
sr_handleip(sr, packet, len, interface);
break;
default:
fprintf(stderr, "Unknown ether_type: %d\n", ethertype(packet));
break;
}/* -- switch -- */
}/* end sr_ForwardPacket */
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);
/*print_hdrs(packet, len);*/
struct sr_if* iface = sr_get_interface(sr, interface);
assert(iface);
if (len < sizeof(sr_ethernet_hdr_t)) {
fprintf(stderr, "ERROR: Packet too small.\n");
return;
}
uint16_t ethtype = ethertype(packet);
switch (ethtype) {
case ethertype_arp:
sr_handlearp(sr, packet, len, iface);
break;
case ethertype_ip:
sr_handleip(sr, packet, len, iface);
break;
default:
fprintf(stderr, "ERROR: Unrecognized Ethernet Type: %d\n", ethtype);
}
}
void sr_handlepacket(struct sr_instance* sr,
uint8_t* packet/* lent */,
unsigned int len,
char* interface/* lent */)
{
/* REQUIRES */
assert(sr);
assert(packet);
assert(interface);
struct sr_if *in_f;
/*We are storing the header inside of packet, which is the address of a buffer*/
sr_ethernet_hdr_t* eth_header_buffer = (sr_ethernet_hdr_t*)packet;
ntoh_eth_hdr(ð_header_buffer);
/* Find the interface packet came from */
in_f = sr_get_interface(sr, interface);
/*Get the address of the data located after the ethernet header*/
uint8_t* ethernet_data_addr = packet + sizeof(sr_ethernet_hdr_t);
if (eth_header_buffer->ether_type == ethertype_ip) {
sr_handleip(sr, packet, len, in_f, ðernet_data_addr);
}
else if (eth_header_buffer->ether_type == ethertype_arp) { /* We have recieved a packet containing ARP data */
sr_handlearp(&sr, ðernet_data_addr, in_f, len); /* Process ARP data */
}
printf("*** -> Received packet of length %d \n",len);
/* fill in code here */
}/* end sr_ForwardPacket */
