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ap: Add MACs to FILS IP Assignment responses

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Try to include the gateway and DNS MAC addresses in the corresponding
fields in the FILS IP Address Assignment IEs we send to the clients.
This commit is contained in:
Andrew Zaborowski 2021-08-28 05:23:05 +02:00 committed by Denis Kenzior
parent 093d23a869
commit 5b7ec7689a
1 changed files with 122 additions and 2 deletions
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124
src/ap.c
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@ -92,6 +92,10 @@ struct ap_state {
struct l_dhcp_server *netconfig_dhcp;
struct l_rtnl_address *netconfig_addr4;
uint32_t rtnl_add_cmd;
uint32_t rtnl_get_gateway4_mac_cmd;
uint32_t rtnl_get_dns4_mac_cmd;
uint8_t netconfig_gateway4_mac[6];
uint8_t netconfig_dns4_mac[6];
bool started : 1;
bool gtk_set : 1;
@ -211,6 +215,16 @@ static void ap_reset(struct ap_state *ap)
if (ap->rtnl_add_cmd)
l_netlink_cancel(rtnl, ap->rtnl_add_cmd);
if (ap->rtnl_get_gateway4_mac_cmd) {
l_netlink_cancel(rtnl, ap->rtnl_get_gateway4_mac_cmd);
ap->rtnl_get_gateway4_mac_cmd = 0;
}
if (ap->rtnl_get_dns4_mac_cmd) {
l_netlink_cancel(rtnl, ap->rtnl_get_dns4_mac_cmd);
ap->rtnl_get_dns4_mac_cmd = 0;
}
l_queue_destroy(ap->sta_states, ap_sta_free);
if (ap->rates)
@ -1470,13 +1484,19 @@ static uint32_t ap_assoc_resp(struct ap_state *ap, struct sta_state *sta,
if (lease_lifetime != 0xffffffff)
ip_resp_info.ipv4_lifetime = lease_lifetime;
if (lease_gateway_str)
if (lease_gateway_str) {
ip_resp_info.ipv4_gateway =
IP4_FROM_STR(lease_gateway_str);
memcpy(ip_resp_info.ipv4_gateway_mac,
ap->netconfig_gateway4_mac, 6);
}
if (lease_dns_str_list && lease_dns_str_list[0])
if (lease_dns_str_list && lease_dns_str_list[0]) {
ip_resp_info.ipv4_dns =
IP4_FROM_STR(lease_dns_str_list[0]);
memcpy(ip_resp_info.ipv4_dns_mac,
ap->netconfig_dns4_mac, 6);
}
l_strv_free(lease_dns_str_list);
sta->ip_alloc_sent = true;
@ -2561,6 +2581,104 @@ static void ap_mlme_notify(struct l_genl_msg *msg, void *user_data)
}
}
static void ap_get_gateway4_mac_cb(int error, const uint8_t *hwaddr,
size_t hwaddr_len, void *user_data)
{
struct ap_state *ap = user_data;
ap->rtnl_get_gateway4_mac_cmd = 0;
if (error) {
l_debug("Error: %s (%i)", strerror(-error), -error);
return;
}
if (L_WARN_ON(unlikely(hwaddr_len != 6)))
return;
l_debug("Resolved mac to " MAC, MAC_STR(hwaddr));
memcpy(ap->netconfig_gateway4_mac, hwaddr, 6);
}
static void ap_get_dns4_mac_cb(int error, const uint8_t *hwaddr,
size_t hwaddr_len, void *user_data)
{
struct ap_state *ap = user_data;
ap->rtnl_get_dns4_mac_cmd = 0;
if (error) {
l_debug("Error: %s (%i)", strerror(-error), -error);
return;
}
if (L_WARN_ON(unlikely(hwaddr_len != 6)))
return;
l_debug("Resolved mac to " MAC, MAC_STR(hwaddr));
memcpy(ap->netconfig_dns4_mac, hwaddr, 6);
}
static void ap_query_macs(struct ap_state *ap, const char *addr_str,
uint8_t prefix_len, const char *gateway_str,
const char **dns_str_list)
{
uint32_t local = IP4_FROM_STR(addr_str);
uint32_t gateway = 0;
uint32_t dns = 0;
uint32_t ifindex = netdev_get_ifindex(ap->netdev);
/*
* For simplicity only check the ARP/NDP tables to see if we already
* have the MACs that we need. There doesn't seem to be an API to
* actually resolve addresses that are not in these tables other than
* by triggering IP traffic to those hosts, such as a ping. In a PC
* or mobile device scenario we're likely to have these MACs already,
* otherwise we give up as this is a pretty low-priority feature.
*/
if (gateway_str) {
gateway = IP4_FROM_STR(gateway_str);
if (L_WARN_ON(unlikely(!gateway)))
return;
if (gateway == local)
memcpy(ap->netconfig_gateway4_mac,
netdev_get_address(ap->netdev), 6);
else {
ap->rtnl_get_gateway4_mac_cmd =
l_rtnl_neighbor_get_hwaddr(rtnl, ifindex,
AF_INET, &gateway,
ap_get_gateway4_mac_cb,
ap, NULL);
if (!ap->rtnl_get_gateway4_mac_cmd)
l_debug("l_rtnl_neighbor_get_hwaddr() failed "
"for the gateway IP");
}
}
if (dns_str_list) {
dns = IP4_FROM_STR(dns_str_list[0]);
if (L_WARN_ON(unlikely(!dns)))
return;
/* TODO: can also skip query if dns == gateway */
if (dns == local)
memcpy(ap->netconfig_dns4_mac,
netdev_get_address(ap->netdev), 6);
else if (util_ip_subnet_match(prefix_len, &dns, &local)) {
ap->rtnl_get_dns4_mac_cmd =
l_rtnl_neighbor_get_hwaddr(rtnl, ifindex,
AF_INET, &dns,
ap_get_dns4_mac_cb,
ap, NULL);
if (!ap->rtnl_get_dns4_mac_cmd)
l_debug("l_rtnl_neighbor_get_hwaddr() failed "
"for the DNS IP");
}
}
}
#define AP_DEFAULT_IPV4_PREFIX_LEN 28
static int ap_setup_netconfig4(struct ap_state *ap, const char **addr_str_list,
@ -2689,6 +2807,8 @@ static int ap_setup_netconfig4(struct ap_state *ap, const char **addr_str_list,
ap->netconfig_set_addr4 = false;
}
ap_query_macs(ap, addr_str_buf, prefix_len, gateway_str, dns_str_list);
cleanup:
l_dhcp_server_destroy(dhcp);
l_rtnl_address_free(new_addr);