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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include <net/if_arp.h>
#include "sd-netlink.h"
#include "netlink-util.h"
#include "networkd-manager.h"
#include "networkd-wiphy.h"
#include "parse-util.h"
#include "wifi-util.h"
#include "wlan.h"
static void wlan_done(NetDev *netdev) {
WLan *w = WLAN(netdev);
w->wiphy_name = mfree(w->wiphy_name);
}
static void wlan_init(NetDev *netdev) {
WLan *w = WLAN(netdev);
w->wiphy_index = UINT32_MAX;
w->wds = -1;
}
static int wlan_get_wiphy(NetDev *netdev, Wiphy **ret) {
WLan *w = WLAN(netdev);
if (w->wiphy_name)
return wiphy_get_by_name(netdev->manager, w->wiphy_name, ret);
return wiphy_get_by_index(netdev->manager, w->wiphy_index, ret);
}
static int wlan_is_ready_to_create(NetDev *netdev, Link *link) {
return wlan_get_wiphy(netdev, NULL) >= 0;
}
static int wlan_fill_message(NetDev *netdev, sd_netlink_message *m) {
WLan *w = WLAN(netdev);
Wiphy *wiphy;
int r;
r = wlan_get_wiphy(netdev, &wiphy);
if (r < 0)
return r;
r = sd_netlink_message_append_u32(m, NL80211_ATTR_WIPHY, wiphy->index);
if (r < 0)
return r;
r = sd_netlink_message_append_string(m, NL80211_ATTR_IFNAME, netdev->ifname);
if (r < 0)
return r;
r = sd_netlink_message_append_u32(m, NL80211_ATTR_IFTYPE, w->iftype);
if (r < 0)
return r;
if (!hw_addr_is_null(&netdev->hw_addr) && netdev->hw_addr.length == ETH_ALEN) {
r = sd_netlink_message_append_ether_addr(m, NL80211_ATTR_MAC, &netdev->hw_addr.ether);
if (r < 0)
return r;
}
if (w->wds >= 0) {
r = sd_netlink_message_append_u8(m, NL80211_ATTR_4ADDR, w->wds);
if (r < 0)
return r;
}
return 0;
}
static int wlan_create_handler(sd_netlink *genl, sd_netlink_message *m, NetDev *netdev) {
int r;
assert(netdev);
assert(netdev->state != _NETDEV_STATE_INVALID);
r = sd_netlink_message_get_errno(m);
if (IN_SET(r, -EEXIST, -ENFILE))
/* Unlike the other netdevs, the kernel may return -ENFILE. See dev_alloc_name(). */
log_netdev_info(netdev, "WLAN interface exists, using existing without changing its parameters.");
else if (r < 0) {
log_netdev_warning_errno(netdev, r, "WLAN interface could not be created: %m");
netdev_enter_failed(netdev);
return 1;
}
log_netdev_debug(netdev, "WLAN interface is created.");
return 1;
}
static int wlan_create(NetDev *netdev) {
_cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
int r;
assert(netdev);
assert(netdev->manager);
assert(netdev->manager->genl);
r = sd_genl_message_new(netdev->manager->genl, NL80211_GENL_NAME, NL80211_CMD_NEW_INTERFACE, &m);
if (r < 0)
return log_netdev_warning_errno(netdev, r, "Failed to allocate netlink message: %m");
r = wlan_fill_message(netdev, m);
if (r < 0)
return log_netdev_warning_errno(netdev, r, "Failed to fill netlink message: %m");
r = netlink_call_async(netdev->manager->genl, NULL, m, wlan_create_handler,
netdev_destroy_callback, netdev);
if (r < 0)
return log_netdev_warning_errno(netdev, r, "Failed to send netlink message: %m");
netdev_ref(netdev);
return 0;
}
static int wlan_verify(NetDev *netdev, const char *filename) {
WLan *w = WLAN(netdev);
assert(filename);
if (w->iftype == NL80211_IFTYPE_UNSPECIFIED)
return log_netdev_warning_errno(netdev, SYNTHETIC_ERRNO(EINVAL),
"%s: WLAN interface type is not specified, ignoring.",
filename);
if (w->wiphy_index == UINT32_MAX && isempty(w->wiphy_name))
return log_netdev_warning_errno(netdev, SYNTHETIC_ERRNO(EINVAL),
"%s: physical WLAN device is not specified, ignoring.",
filename);
return 0;
}
int config_parse_wiphy(
const char *unit,
const char *filename,
unsigned line,
const char *section,
unsigned section_line,
const char *lvalue,
int ltype,
const char *rvalue,
void *data,
void *userdata) {
WLan *w = WLAN(userdata);
int r;
assert(filename);
assert(lvalue);
assert(rvalue);
if (isempty(rvalue)) {
w->wiphy_name = mfree(w->wiphy_name);
w->wiphy_index = UINT32_MAX;
return 0;
}
r = safe_atou32(rvalue, &w->wiphy_index);
if (r >= 0) {
w->wiphy_name = mfree(w->wiphy_name);
return 0;
}
r = free_and_strdup_warn(&w->wiphy_name, rvalue);
if (r < 0)
return r;
w->wiphy_index = UINT32_MAX;
return 0;
}
int config_parse_wlan_iftype(
const char *unit,
const char *filename,
unsigned line,
const char *section,
unsigned section_line,
const char *lvalue,
int ltype,
const char *rvalue,
void *data,
void *userdata) {
enum nl80211_iftype t, *iftype = ASSERT_PTR(data);
assert(filename);
assert(lvalue);
assert(rvalue);
if (isempty(rvalue)) {
*iftype = NL80211_IFTYPE_UNSPECIFIED;
return 0;
}
t = nl80211_iftype_from_string(rvalue);
/* We reuse the kernel provided enum which does not contain negative value. So, the cast
* below is mandatory. Otherwise, the check below always passes. */
if ((int) t < 0) {
log_syntax(unit, LOG_WARNING, filename, line, t,
"Failed to parse wlan interface type, ignoring assignment: %s",
rvalue);
return 0;
}
*iftype = t;
return 0;
}
const NetDevVTable wlan_vtable = {
.object_size = sizeof(WLan),
.init = wlan_init,
.done = wlan_done,
.sections = NETDEV_COMMON_SECTIONS "WLAN\0",
.is_ready_to_create = wlan_is_ready_to_create,
.create = wlan_create,
.create_type = NETDEV_CREATE_INDEPENDENT,
.config_verify = wlan_verify,
.iftype = ARPHRD_ETHER,
.generate_mac = true,
.skip_netdev_kind_check = true,
};
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