void route_table_mgr::create_route_val_from_info(const netlink_route_info *netlink_route_info, route_val &netlink_route_val)
{
char dst_addr_chr[ADDR_LEN];
inet_ntop(AF_INET, netlink_route_info->dst_addr, dst_addr_chr, ADDR_LEN);
netlink_route_val.set_dst_addr(inet_addr((const char*)dst_addr_chr));
in_addr_t dst_mask = htonl(VMA_NETMASK(netlink_route_info->dst_prefixlen));
netlink_route_val.set_dst_mask(dst_mask);
netlink_route_val.set_dst_pref_len(netlink_route_info->dst_prefixlen);
netlink_route_val.set_protocol(netlink_route_info->protocol);
netlink_route_val.set_scope(netlink_route_info->scope);
netlink_route_val.set_type(netlink_route_info->type);
int if_index = netlink_route_info->oif;
netlink_route_val.set_if_index(if_index);
char if_name[IFNAMSIZ];
if_indextoname(if_index,if_name);
netlink_route_val.set_if_name(if_name);
struct sockaddr_in src_addr;
if (!get_ipv4_from_ifname(if_name, &src_addr)) {
netlink_route_val.set_src_addr(src_addr.sin_addr.s_addr);
}
netlink_route_val.set_str();
if (g_vlogger_level >= VLOG_FUNC) {
netlink_route_val.print_route_val();
}
}
bool route_table_mgr::rt_mgr_parse_enrty(nlmsghdr *nl_header, route_val *p_rtv)
{
int len;
struct rtmsg *rt_msg;
struct rtattr *rt_attribute;
// get route entry header
rt_msg = (struct rtmsg *) NLMSG_DATA(nl_header);
// we are only concerned about the main route table
if (rt_msg->rtm_family != AF_INET || rt_msg->rtm_table != RT_TABLE_MAIN)
return false;
p_rtv->set_protocol(rt_msg->rtm_protocol);
p_rtv->set_scope(rt_msg->rtm_scope);
p_rtv->set_type(rt_msg->rtm_type);
in_addr_t dst_mask = htonl(VMA_NETMASK(rt_msg->rtm_dst_len));
p_rtv->set_dst_mask(dst_mask);
p_rtv->set_dst_pref_len(rt_msg->rtm_dst_len);
len = RTM_PAYLOAD(nl_header);
rt_attribute = (struct rtattr *) RTM_RTA(rt_msg);
for (;RTA_OK(rt_attribute, len);rt_attribute=RTA_NEXT(rt_attribute,len)) {
rt_mgr_parse_attr(rt_attribute, p_rtv);
}
p_rtv->set_state(true);
if (!p_rtv->get_src_addr()) {
struct sockaddr_in src_addr;
char *if_name = (char *)p_rtv->get_if_name();
if (!get_ipv4_from_ifname(if_name, &src_addr)) {
p_rtv->set_src_addr(src_addr.sin_addr.s_addr);
}
else {
// Failed mapping if_name to IPv4 address
// Should we log or return error also from here?
}
}
p_rtv->set_str();
return true;
}
void route_table_mgr::rt_mgr_update_source_ip()
{
route_val *p_val;
//for route entries which still have no src ip and no gw
for (int i = 0; i < m_tab.entries_num; i++) {
p_val = &m_tab.value[i];
if (p_val->get_src_addr() || p_val->get_gw_addr()) continue;
if (g_p_net_device_table_mgr) { //try to get src ip from net_dev list of the interface
in_addr_t longest_prefix = 0;
in_addr_t correct_src = 0;
net_dev_lst_t* nd_lst = g_p_net_device_table_mgr->get_net_device_val_lst_from_index(p_val->get_if_index());
if (nd_lst) {
net_dev_lst_t::iterator iter = nd_lst->begin();
while (iter != nd_lst->end()) {
if((p_val->get_dst_addr() & (*iter)->get_netmask()) == ((*iter)->get_local_addr() & (*iter)->get_netmask())) { //found a match in routing table
if(((*iter)->get_netmask() | longest_prefix) != longest_prefix){
longest_prefix = (*iter)->get_netmask(); // this is the longest prefix match
correct_src = (*iter)->get_local_addr();
}
}
iter++;
}
if (correct_src) {
p_val->set_src_addr(correct_src);
continue;
}
}
}
// if still no src ip, get it from ioctl
struct sockaddr_in src_addr;
char *if_name = (char *)p_val->get_if_name();
if (!get_ipv4_from_ifname(if_name, &src_addr)) {
p_val->set_src_addr(src_addr.sin_addr.s_addr);
}
else {
// Failed mapping if_name to IPv4 address
rt_mgr_logwarn("could not figure out source ip for rtv = %s", p_val->to_str());
}
}
//for route entries with gateway, do recursive search for src ip
int num_unresolved_src = m_tab.entries_num;
int prev_num_unresolved_src = 0;
do {
prev_num_unresolved_src = num_unresolved_src;
num_unresolved_src = 0;
for (int i = 0; i < m_tab.entries_num; i++) {
p_val = &m_tab.value[i];
if (p_val->get_gw_addr() && !p_val->get_src_addr()) {
route_val* p_val_dst;
in_addr_t in_addr = p_val->get_gw_addr();
unsigned char table_id = p_val->get_table_id();
if (find_route_val(in_addr, table_id, p_val_dst)) {
if (p_val_dst->get_src_addr()) {
p_val->set_src_addr(p_val_dst->get_src_addr());
} else if (p_val == p_val_dst) { //gateway of the entry lead to same entry
net_dev_lst_t* nd_lst = g_p_net_device_table_mgr->get_net_device_val_lst_from_index(p_val->get_if_index());
if (nd_lst) {
net_dev_lst_t::iterator iter = nd_lst->begin();
while (iter != nd_lst->end()) {
if(p_val->get_gw_addr() == (*iter)->get_local_addr()) {
p_val->set_gw(0);
p_val->set_src_addr((*iter)->get_local_addr());
break;
}
iter++;
}
}
if (!p_val->get_src_addr())
num_unresolved_src++;
} else {
num_unresolved_src++;
}
// gateway and source are equal, no need of gw.
if (p_val->get_src_addr() == p_val->get_gw_addr()) {
p_val->set_gw(0);
}
} else {
num_unresolved_src++;
}
}
}
} while (num_unresolved_src && prev_num_unresolved_src > num_unresolved_src);
//for route entries which still have no src ip
for (int i = 0; i < m_tab.entries_num; i++) {
p_val = &m_tab.value[i];
if (p_val->get_src_addr()) continue;
if (p_val->get_gw_addr()) {
rt_mgr_logdbg("could not figure out source ip for gw address. rtv = %s", p_val->to_str());
}
// if still no src ip, get it from ioctl
struct sockaddr_in src_addr;
char *if_name = (char *)p_val->get_if_name();
if (!get_ipv4_from_ifname(if_name, &src_addr)) {
p_val->set_src_addr(src_addr.sin_addr.s_addr);
}
else {
// Failed mapping if_name to IPv4 address
rt_mgr_logwarn("could not figure out source ip for rtv = %s", p_val->to_str());
}
}
}
