/*******************************************************************
* Removes a given subnet from a given router. Moves last entry in subnets array into deleted space.
*******************************************************************/
int remove_subnet_from_router(struct sr_instance *sr, struct router *rt, struct route *subnet)
{
/*decrease size, remove appropriate subnet, move last subnet into empty spot in the array
this keeps all entries packed*/
int i;
for(i = 0; i < rt->subnet_size; i++)
{
if(route_cmp(rt->subnets[i], subnet) == 0)
{
rt->subnets[i] = NULL;
rt->subnets[i] = rt->subnets[rt->subnet_size-1];
i = rt->subnet_size;
rt->subnet_size--;
}
}
/*if this subnet is a router*/
if(subnet->r_id != 0)
{
for(i = 0; i < rt->adj_size; i++)
{
if(subnet->r_id == rt->adjacencies[i]->rid)
{
rt->adjacencies[i] = NULL;
rt->adjacencies[i] = rt->adjacencies[rt->adj_size-1];
i = rt->adj_size;
rt->adj_size--;
}
}
}
return 1;
}
route * r3_node_match_route(node *n, match_entry * entry) {
if (n->routes && n->route_len > 0) {
int i;
for (i = 0; i < n->route_len ; i++ ) {
if ( route_cmp(n->routes[i], entry) == 0 ) {
return n->routes[i];
}
}
}
return NULL;
}
/*******************************************************************
* Checks if a router contains a subnet based on prefix, mask, and rid.
*******************************************************************/
int router_contains(struct route* rt, struct router *host)
{
int i;
for(i = 0; i < host->subnet_size; i++)
{
if(route_cmp(host->subnets[i], rt) == 0)
{
return 1;
}
}
return 0;
}
/***********************************************************
* Checks that the array of advertisements contains a specific subnet
**************************************************************/
int sub_in_adv(struct sr_instance* sr, struct route** advs, struct route* route, int num_ads)
{
int i;
for(i=0; i< num_ads; i++)
{
if(route_cmp(route, advs[i])==0)
{
return 1;
}
}
return 0;
}
