static int
arp_find(Conn_t *conn)
{
Reg_t *tmp;
Lecdb_t *ltmp;
Debug_unit(&conn_unit, "Arp_find called");
dump_conn(conn);
Debug_unit(&conn_unit,"Arping for:");
dump_addr(&control_packet->target);
dump_printf(EL_CONT,"\n");
/* If requested multicast /broadcast address, respond with BUS address */
if (is_multicast(&control_packet->target)) {
tmp = mem_alloc(&conn_unit, sizeof(Reg_t));
memcpy(&tmp->atm_address, get_var_addr(&conn_unit, "S6"),
sizeof(AtmAddr_t));
Debug_unit(&conn_unit,"Arp for multicast address");
send_arp_response(conn->sfd, control_packet,
LE_STATUS_SUCCESS, tmp);
return 1;
}
/* Check lecid */
ltmp = leciddb_find(control_packet->lecid);
if (!ltmp) {
send_arp_response(conn->sfd, control_packet,
LE_STATUS_BAD_LECID, NULL);
return 1;
}
tmp = regdb_find_mac(control_packet->target);
if (tmp) {
Debug_unit(&conn_unit,"Address in databases");
/* Send response */
send_arp_response(conn->sfd, control_packet,
LE_STATUS_SUCCESS,
tmp);
return 1;
}
forward_arp_request(control_packet, proxylist);
return 1;
}
int handle_arp_packet(struct sr_instance * sr, uint8_t * packet, unsigned int len ){
int res;
struct sr_arp_hdr *arp_hdr = (struct sr_arp_hdr *)(packet + sizeof(sr_ethernet_hdr_t));
int arp_op = ntohs(arp_hdr->ar_op);
/* check to see if the target IP belongs to one of our routers */
struct sr_if* assoc_iface = validate_ip(sr->if_list, arp_hdr->ar_tip);
if (!assoc_iface){
/* if its not one of ours, ignore it */
return -1;
}
if (arp_op == arp_op_request){
/* this is an incoming request */
res = send_arp_response(sr, assoc_iface, packet, len);
if (res != 0){
fprintf(stderr, "bad send_arp_response\n");
return -1;
}
} else if (arp_op == arp_op_reply) {
/* this is an incoming reply */
res = handle_arp_reply(sr, packet, len);
if (res != 0){
return -1;
}
} else {
/* bad arp_op type */
return -1;
}
return 0;
}
