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iwd/src/netconfig.c

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/*
*
* Wireless daemon for Linux
*
* Copyright (C) 2019 Intel Corporation. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#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/common.h"
#include "src/network.h"
#include "src/rtnlutil.h"
#include "src/netconfig.h"
struct netconfig {
uint32_t ifindex;
enum station_state station_state;
struct l_dhcp_client *dhcp_client;
struct l_queue *ifaddr_list;
};
struct netconfig_ifaddr {
uint8_t family;
uint8_t prefix_len;
char *ip;
char *broadcast;
};
static struct l_netlink *rtnl;
static struct l_queue *netconfig_list;
static void do_debug(const char *str, void *user_data)
{
const char *prefix = user_data;
l_info("%s%s", prefix, str);
}
static void netconfig_ifaddr_destroy(void *data)
{
struct netconfig_ifaddr *ifaddr = data;
l_free(ifaddr->ip);
l_free(ifaddr->broadcast);
l_free(ifaddr);
}
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);
}
static bool netconfig_match(const void *a, const void *b)
{
const struct netconfig *netconfig = a;
uint32_t ifindex = L_PTR_TO_UINT(b);
if (netconfig->ifindex == ifindex)
return true;
return false;
}
static struct netconfig *netconfig_find(uint32_t ifindex)
{
const struct l_queue_entry *entry;
for (entry = l_queue_get_entries(netconfig_list); entry;
entry = entry->next) {
struct netconfig *netconfig = entry->data;
if (netconfig->ifindex != ifindex)
continue;
return netconfig;
}
return NULL;
}
static struct netconfig_ifaddr *netconfig_ifaddr_find(
const struct netconfig *netconfig,
uint8_t family, uint8_t prefix_len,
const char *ip)
{
const struct l_queue_entry *entry;
for (entry = l_queue_get_entries(netconfig->ifaddr_list); entry;
entry = entry->next) {
struct netconfig_ifaddr *ifaddr = entry->data;
if (ifaddr->family != family)
continue;
if (ifaddr->prefix_len != prefix_len)
continue;
if (strcmp(ifaddr->ip, ip))
continue;
return ifaddr;
}
return NULL;
}
static void netconfig_ifaddr_added(struct netconfig *netconfig,
const struct ifaddrmsg *ifa, int bytes)
{
struct netconfig_ifaddr *ifaddr;
char *label;
ifaddr = l_new(struct netconfig_ifaddr, 1);
ifaddr->family = ifa->ifa_family;
ifaddr->prefix_len = ifa->ifa_prefixlen;
rtnl_ifaddr_extract(ifa, bytes, &label, &ifaddr->ip,
&ifaddr->broadcast);
l_debug("%s: ifaddr %s/%u broadcast %s", label, ifaddr->ip,
ifaddr->prefix_len, ifaddr->broadcast);
l_free(label);
l_queue_push_tail(netconfig->ifaddr_list, ifaddr);
}
static void netconfig_ifaddr_deleted(struct netconfig *netconfig,
const struct ifaddrmsg *ifa, int bytes)
{
struct netconfig_ifaddr *ifaddr;
char *ip;
rtnl_ifaddr_extract(ifa, bytes, NULL, &ip, NULL);
ifaddr = netconfig_ifaddr_find(netconfig, ifa->ifa_family,
ifa->ifa_prefixlen, ip);
l_free(ip);
if (!ifaddr)
return;
l_debug("ifaddr %s/%u", ifaddr->ip, ifaddr->prefix_len);
l_queue_remove(netconfig->ifaddr_list, ifaddr);
netconfig_ifaddr_destroy(ifaddr);
}
static void netconfig_ifaddr_notify(uint16_t type, const void *data,
uint32_t len, void *user_data)
{
const struct ifaddrmsg *ifa = data;
struct netconfig *netconfig;
unsigned int bytes;
netconfig = netconfig_find(ifa->ifa_index);
if (!netconfig)
/* Ignore the interfaces which aren't managed by iwd. */
return;
bytes = len - NLMSG_ALIGN(sizeof(struct ifaddrmsg));
switch (type) {
case RTM_NEWADDR:
netconfig_ifaddr_added(netconfig, ifa, bytes);
break;
case RTM_DELADDR:
netconfig_ifaddr_deleted(netconfig, ifa, bytes);
break;
}
}
static void netconfig_ifaddr_cmd_cb(int error, uint16_t type,
const void *data, uint32_t len,
void *user_data)
{
if (error) {
l_error("netconfig: ifaddr command failure. "
"Error %d: %s", error, strerror(-error));
return;
}
if (type != RTM_NEWADDR)
return;
netconfig_ifaddr_notify(type, data, len, user_data);
}
static bool netconfig_ifaddr_remove(void *data, void *user_data)
{
struct netconfig *netconfig = user_data;
struct netconfig_ifaddr *ifaddr = data;
switch (ifaddr->family) {
case AF_INET:
if (rtnl_ifaddr_delete(rtnl, netconfig->ifindex,
ifaddr->prefix_len, ifaddr->ip,
ifaddr->broadcast,
netconfig_ifaddr_cmd_cb, NULL, NULL))
break;
l_error("netconfig: Failed to remove ifaddr %s from "
"interface %u", ifaddr->ip, netconfig->ifindex);
break;
default:
l_error("netconfig: Unsupported address family: %u",
ifaddr->family);
break;
}
netconfig_ifaddr_destroy(ifaddr);
return true;
}
static bool netconfig_install_addresses(struct netconfig *netconfig,
const struct netconfig_ifaddr *ifaddr,
const char *gateway, char **dns)
{
if (netconfig_ifaddr_find(netconfig, ifaddr->family, ifaddr->prefix_len,
ifaddr->ip))
/* The address is already installed. */
goto gateway;
switch (ifaddr->family) {
case AF_INET:
if (rtnl_ifaddr_add(rtnl, netconfig->ifindex,
ifaddr->prefix_len, ifaddr->ip,
ifaddr->broadcast,
netconfig_ifaddr_cmd_cb, netconfig,
NULL))
break;
l_error("netconfig: Failed to set IP %s/%u.", ifaddr->ip,
ifaddr->prefix_len);
return false;
default:
l_error("netconfig: Unsupported address family: %u",
ifaddr->family);
break;
}
gateway:
/* TODO: Add the routes and domain name servers. */
return true;
}
static bool netconfig_uninstall_addresses(struct netconfig *netconfig,
const struct netconfig_ifaddr *ifaddr,
const char *gateway, char **dns)
{
if (!netconfig_ifaddr_find(netconfig, ifaddr->family,
ifaddr->prefix_len, ifaddr->ip))
/* The address is already removed. */
goto gateway;
if (!netconfig_ifaddr_remove(netconfig, (void *) ifaddr)) {
l_error("netconfig: Failed to remove IP %s/%u.", ifaddr->ip,
ifaddr->prefix_len);
return false;
}
gateway:
/* TODO: Remove the routes and domain name servers. */
return true;
}
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;
}
static bool netconfig_load_static_addresses(struct netconfig *netconfig,
struct station *station)
{
const struct network *network;
const struct l_settings *settings;
struct netconfig_ifaddr ifaddr;
struct in_addr in_addr;
char *netmask;
char *gateway;
char **dns;
l_debug();
network = station_get_connected_network(station);
if (!network)
return false;
settings = network_get_settings(network);
if (!settings)
return false;
ifaddr.ip = l_settings_get_string(settings, "IPv4", "ip");
gateway = l_settings_get_string(settings, "IPv4", "gateway");
if (!ifaddr.ip || !gateway) {
l_free(ifaddr.ip);
l_free(gateway);
return false;
}
netmask = l_settings_get_string(settings, "IPv4", "netmask");
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;
l_free(netmask);
ifaddr.broadcast = l_settings_get_string(settings, "IPv4", "broadcast");
dns = l_settings_get_string_list(settings, "IPv4", "dns", ' ');
ifaddr.family = AF_INET;
netconfig_install_addresses(netconfig, &ifaddr, gateway, dns);
l_free(ifaddr.ip);
l_free(gateway);
l_free(ifaddr.broadcast);
l_strfreev(dns);
return true;
}
static void netconfig_station_state_changed(enum station_state state,
void *userdata)
{
struct netconfig *netconfig = userdata;
struct station *station;
l_debug("");
switch (state) {
case STATION_STATE_CONNECTED:
station = station_find(netconfig->ifindex);
if (!station)
break;
if (netconfig_load_static_addresses(netconfig, station))
break;
if (netconfig->station_state == STATION_STATE_ROAMING) {
/*
* TODO l_dhcp_client to try to request a previously
* used address.
*
* break;
*/
}
if (!l_dhcp_client_start(netconfig->dhcp_client))
l_error("netconfig: Failed to start DHCPv4 client for "
"interface %u", netconfig->ifindex);
break;
case STATION_STATE_DISCONNECTED:
l_dhcp_client_stop(netconfig->dhcp_client);
l_queue_foreach_remove(netconfig->ifaddr_list,
netconfig_ifaddr_remove, netconfig);
break;
case STATION_STATE_ROAMING:
break;
default:
return;
}
netconfig->station_state = state;
}
bool netconfig_ifindex_add(uint32_t ifindex)
{
struct netconfig *netconfig;
struct station *station;
if (!netconfig_list)
return false;
l_debug("Starting netconfig for interface: %d", ifindex);
netconfig = netconfig_find(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);
station_add_state_watch(station, netconfig_station_state_changed,
netconfig, NULL);
l_queue_push_tail(netconfig_list, netconfig);
return true;
}
bool netconfig_ifindex_remove(uint32_t ifindex)
{
struct netconfig *netconfig;
if (!netconfig_list)
return false;
l_debug();
netconfig = l_queue_remove_if(netconfig_list, netconfig_match,
L_UINT_TO_PTR(ifindex));
if (!netconfig)
return false;
netconfig_destroy(netconfig);
return true;
}
static int netconfig_init(void)
{
bool enabled;
uint32_t r;
if (netconfig_list)
return -EALREADY;
if (!l_settings_get_bool(iwd_get_config(), "General",
"enable_network_config", &enabled) ||
!enabled) {
l_warn("netconfig: Network configuration with the IP addresses "
"is disabled.");
return false;
}
rtnl = l_netlink_new(NETLINK_ROUTE);
if (!rtnl) {
l_error("netconfig: Failed to open route netlink socket");
return -EPERM;
}
if (getenv("IWD_RTNL_DEBUG"))
l_netlink_set_debug(rtnl, do_debug, "[NETCONFIG RTNL] ", NULL);
r = l_netlink_register(rtnl, RTNLGRP_IPV4_IFADDR,
netconfig_ifaddr_notify, NULL, NULL);
if (!r) {
l_error("netconfig: Failed to register for RTNL link address"
" notifications.");
l_netlink_destroy(rtnl);
rtnl = NULL;
return r;
}
r = rtnl_ifaddr_get(rtnl, netconfig_ifaddr_cmd_cb, NULL, NULL);
if (!r) {
l_error("netconfig: Failed to get addresses from RTNL link.");
l_netlink_destroy(rtnl);
rtnl = NULL;
return r;
}
netconfig_list = l_queue_new();
return 0;
}
static void netconfig_exit(void)
{
if (!netconfig_list)
return;
l_netlink_destroy(rtnl);
rtnl = NULL;
l_queue_destroy(netconfig_list, netconfig_destroy);
}
IWD_MODULE(netconfig, netconfig_init, netconfig_exit)