void route_table_mgr::new_route_event(route_val &netlink_route_val)
{
int number_of_entries = m_tab.entries_num++;
netlink_route_val.set_state(true);
in_addr_t new_dst_addr = netlink_route_val.get_dst_addr();
in_addr_t new_dst_mask = netlink_route_val.get_dst_mask();
int new_dst_pref_len = netlink_route_val.get_dst_pref_len();
char *new_if_name = (char *) netlink_route_val.get_if_name();
rt_mgr_logdbg("netlink event- route added: dst '%d.%d.%d.%d', netmask '%d.%d.%d.%d', interface '%s'", NIPQUAD(new_dst_addr), NIPQUAD(new_dst_mask), new_if_name);
if(find_route_val(netlink_route_val)) {
rt_mgr_logdbg("route already exists: dst '%d.%d.%d.%d', netmask '%d.%d.%d.%d', interface '%s'", NIPQUAD(new_dst_addr), NIPQUAD(new_dst_mask), new_if_name);
return;
}
m_tab.value[number_of_entries] = netlink_route_val;
in_addr_t common_prefix;
// set necessary route_vals as not valid
for (int i = 0; i < m_tab.entries_num; i++) {
route_val* p_val_from_tbl = &m_tab.value[i];
if (!p_val_from_tbl->is_deleted() && p_val_from_tbl->is_if_up()) {
common_prefix = p_val_from_tbl->get_dst_addr() & new_dst_mask;
// check if the new route is more specific than an existing route
// example: if route table contains entry for- 1.1.1.1/24
// and a new entry for- 1.1.1.1/32 is added
// then route might change for some dst ips ---> set as invalid
if((common_prefix == (new_dst_addr & new_dst_mask)) && p_val_from_tbl->get_dst_pref_len() < new_dst_pref_len) {
p_val_from_tbl->set_state(false);
rt_mgr_logdbg("route_val %p is not valid", p_val_from_tbl);
p_val_from_tbl->print_route_val();
}
}
}
rt_mgr_logdbg("route added: dst '%d.%d.%d.%d', netmask '%d.%d.%d.%d', interface '%s'", NIPQUAD(new_dst_addr), NIPQUAD(new_dst_mask), new_if_name);
if (g_vlogger_level >= VLOG_FUNC) {
print_route_tbl();
}
update_invalid_entries();
}
route_table_mgr::route_table_mgr() : cache_table_mgr<ip_address,route_val*>("route_table_mgr")
{
rt_mgr_logdbg("");
m_pid = getpid();
m_buff_size = MSG_BUFF_SIZE;
m_seq_num = 0;
// Create Socket
BULLSEYE_EXCLUDE_BLOCK_START
if ((m_fd = orig_os_api.socket(PF_NETLINK, SOCK_DGRAM, NETLINK_ROUTE)) < 0) {
rt_mgr_logerr("NL socket Creation: ");
return;
}
BULLSEYE_EXCLUDE_BLOCK_END
//save the routing table
rt_mgr_update_tbl();
// create route_entry for each net_dev- needed for receiving port up/down events for net_dev_entry
route_val *p_rtv;
for (int i = 0; i < m_rt_tab.entries_num; i++)
{
p_rtv = &m_rt_tab.rtv[i];
in_addr_t src_addr = p_rtv->get_src_addr();
std::tr1::unordered_map<in_addr_t, route_entry*>::iterator iter = m_rte_list_for_each_net_dev.find(src_addr);
// if src_addr of interface exists in the map, no need to create another route_entry
if (iter == m_rte_list_for_each_net_dev.end()) {
m_rte_list_for_each_net_dev.insert(pair<in_addr_t, route_entry*> (src_addr, create_new_entry(ip_address(src_addr), NULL)));
}
}
print_route_tbl();
// register to netlink event
g_p_netlink_handler->register_event(nlgrpROUTE, this);
rt_mgr_logdbg("Registered to g_p_netlink_handler");
rt_mgr_logdbg("Done");
}
void route_table_mgr::del_route_event(route_val &netlink_route_val)
{
in_addr_t del_dst_addr = netlink_route_val.get_dst_addr();
in_addr_t del_dst_mask = netlink_route_val.get_dst_mask();
char *del_if_name = (char *) netlink_route_val.get_if_name();
rt_mgr_logdbg("netlink event- route deleted: dst '%d.%d.%d.%d', netmask '%d.%d.%d.%d', interface '%s'", NIPQUAD(del_dst_addr), NIPQUAD(del_dst_mask), del_if_name);
route_val* p_val_from_tbl = find_route_val(netlink_route_val);
if(p_val_from_tbl) {
rt_mgr_logdbg("found deleted route val[%p]: %s", p_val_from_tbl, p_val_from_tbl->to_str());
p_val_from_tbl->set_deleted();
p_val_from_tbl->set_state(false);
return;
}
rt_mgr_logdbg("route does not exist!");
if (g_vlogger_level >= VLOG_FUNC) {
print_route_tbl();
}
update_invalid_entries();
}
