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netconfig: Introduce IPv4 DHCP client

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The client is used to obtain and configure the dynamic IPv4
addresses for the network.
This commit is contained in:
Tim Kourt 2019-06-25 15:20:56 -07:00 committed by Denis Kenzior
parent 1368851611
commit 3d40f3a38b
1 changed files with 142 additions and 0 deletions
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142
src/netconfig.c
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@ -25,16 +25,22 @@
#endif
#include <errno.h>
#include <arpa/inet.h>
#include <linux/rtnetlink.h>
#include <linux/if_arp.h>
#include <linux/in.h>
#include <ell/ell.h>
#include "src/iwd.h"
#include "src/netdev.h"
#include "src/station.h"
#include "src/rtnlutil.h"
#include "src/netconfig.h"
struct netconfig {
uint32_t ifindex;
struct l_dhcp_client *dhcp_client;
struct l_queue *ifaddr_list;
};
@ -69,6 +75,8 @@ static void netconfig_destroy(void *data)
{
struct netconfig *netconfig = data;
l_dhcp_client_destroy(netconfig->dhcp_client);
l_queue_destroy(netconfig->ifaddr_list, netconfig_ifaddr_destroy);
l_free(netconfig);
@ -211,9 +219,137 @@ static void netconfig_ifaddr_cmd_cb(int error, uint16_t type,
netconfig_ifaddr_notify(type, data, len, user_data);
}
static bool netconfig_install_addresses(struct netconfig *netconfig,
const struct netconfig_ifaddr *ifaddr,
const char *gateway, char **dns)
{
return false;
}
static bool netconfig_uninstall_addresses(struct netconfig *netconfig,
const struct netconfig_ifaddr *ifaddr,
const char *gateway, char **dns)
{
return false;
}
enum lease_action {
LEASE_ACTION_INSTALL,
LEASE_ACTION_UNINSTALL,
};
static void netconfig_dhcp_lease_received(struct netconfig *netconfig,
const struct l_dhcp_client *client,
enum lease_action action)
{
const struct l_dhcp_lease *lease;
struct netconfig_ifaddr ifaddr;
struct in_addr in_addr;
char *netmask;
char *gateway;
char **dns;
l_debug();
lease = l_dhcp_client_get_lease(client);
if (!lease)
return;
ifaddr.ip = l_dhcp_lease_get_address(lease);
gateway = l_dhcp_lease_get_gateway(lease);
if (!ifaddr.ip || !gateway)
goto no_ip;
netmask = l_dhcp_lease_get_netmask(lease);
if (netmask && inet_pton(AF_INET, netmask, &in_addr) > 0)
ifaddr.prefix_len =
__builtin_popcountl(L_BE32_TO_CPU(in_addr.s_addr));
else
ifaddr.prefix_len = 24;
ifaddr.broadcast = l_dhcp_lease_get_broadcast(lease);
dns = l_dhcp_lease_get_dns(lease);
ifaddr.family = AF_INET;
switch (action) {
case LEASE_ACTION_INSTALL:
netconfig_install_addresses(netconfig, &ifaddr, gateway, dns);
break;
case LEASE_ACTION_UNINSTALL:
netconfig_uninstall_addresses(netconfig, &ifaddr, gateway, dns);
break;
}
l_strfreev(dns);
l_free(netmask);
l_free(ifaddr.broadcast);
no_ip:
l_free(ifaddr.ip);
l_free(gateway);
}
static void netconfig_dhcp_event_handler(struct l_dhcp_client *client,
enum l_dhcp_client_event event,
void *userdata)
{
struct netconfig *netconfig = userdata;
l_debug("DHCPv4 event %d", event);
switch (event) {
case L_DHCP_CLIENT_EVENT_LEASE_RENEWED:
case L_DHCP_CLIENT_EVENT_LEASE_OBTAINED:
case L_DHCP_CLIENT_EVENT_IP_CHANGED:
netconfig_dhcp_lease_received(netconfig, client,
LEASE_ACTION_INSTALL);
break;
case L_DHCP_CLIENT_EVENT_LEASE_EXPIRED:
netconfig_dhcp_lease_received(netconfig, client,
LEASE_ACTION_UNINSTALL);
/* Fall through. */
case L_DHCP_CLIENT_EVENT_NO_LEASE:
/*
* The requested address is no longer available, try to restart
* the client.
*/
if (!l_dhcp_client_start(client))
l_error("netconfig: Failed to re-start DHCPv4 client "
"for interface %u", netconfig->ifindex);
break;
default:
l_error("netconfig: Received unsupported DHCPv4 event: %d",
event);
}
}
static bool netconfig_dhcp_create(struct netconfig *netconfig,
struct station *station)
{
netconfig->dhcp_client = l_dhcp_client_new(netconfig->ifindex);
l_dhcp_client_set_address(netconfig->dhcp_client, ARPHRD_ETHER,
netdev_get_address(
station_get_netdev(station)),
ETH_ALEN);
l_dhcp_client_set_event_handler(netconfig->dhcp_client,
netconfig_dhcp_event_handler,
netconfig, NULL);
if (getenv("IWD_DHCP_DEBUG"))
l_dhcp_client_set_debug(netconfig->dhcp_client, do_debug,
"[DHCPv4] ", NULL);
return true;
}
bool netconfig_ifindex_add(uint32_t ifindex)
{
struct netconfig *netconfig;
struct station *station;
if (!netconfig_list)
return false;
@ -224,10 +360,16 @@ bool netconfig_ifindex_add(uint32_t ifindex)
if (netconfig)
return true;
station = station_find(ifindex);
if (!station)
return false;
netconfig = l_new(struct netconfig, 1);
netconfig->ifindex = ifindex;
netconfig->ifaddr_list = l_queue_new();
netconfig_dhcp_create(netconfig, station);
l_queue_push_tail(netconfig_list, netconfig);
return true;