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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include <net/ethernet.h>
#include <linux/nl80211.h>
#include "ether-addr-util.h"
#include "netlink-util.h"
#include "networkd-link.h"
#include "networkd-manager.h"
#include "networkd-wifi.h"
#include "networkd-wiphy.h"
#include "string-util.h"
#include "wifi-util.h"
int link_get_wlan_interface(Link *link) {
_cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL, *reply = NULL;
int r;
assert(link);
r = sd_genl_message_new(link->manager->genl, NL80211_GENL_NAME, NL80211_CMD_GET_INTERFACE, &req);
if (r < 0)
return log_link_debug_errno(link, r, "Failed to create generic netlink message: %m");
r = sd_netlink_message_append_u32(req, NL80211_ATTR_IFINDEX, link->ifindex);
if (r < 0)
return log_link_debug_errno(link, r, "Could not append NL80211_ATTR_IFINDEX attribute: %m");
r = sd_netlink_call(link->manager->genl, req, 0, &reply);
if (r < 0)
return log_link_debug_errno(link, r, "Failed to request information about wlan interface: %m");
if (!reply) {
log_link_debug(link, "No reply received to request for information about wifi interface, ignoring.");
return 0;
}
return manager_genl_process_nl80211_config(link->manager->genl, reply, link->manager);
}
int manager_genl_process_nl80211_config(sd_netlink *genl, sd_netlink_message *message, Manager *manager) {
_cleanup_free_ char *ssid = NULL;
uint32_t ifindex, wlan_iftype;
const char *family, *ifname;
uint8_t cmd;
size_t len;
Link *link;
int r;
assert(genl);
assert(message);
assert(manager);
if (sd_netlink_message_is_error(message)) {
r = sd_netlink_message_get_errno(message);
if (r < 0)
log_message_warning_errno(message, r, "nl80211: received error message, ignoring");
return 0;
}
r = sd_genl_message_get_family_name(genl, message, &family);
if (r < 0) {
log_debug_errno(r, "nl80211: failed to determine genl family, ignoring: %m");
return 0;
}
if (!streq(family, NL80211_GENL_NAME)) {
log_debug("nl80211: received message of unexpected genl family '%s', ignoring.", family);
return 0;
}
r = sd_genl_message_get_command(genl, message, &cmd);
if (r < 0) {
log_debug_errno(r, "nl80211: failed to determine genl message command, ignoring: %m");
return 0;
}
if (IN_SET(cmd, NL80211_CMD_NEW_WIPHY, NL80211_CMD_DEL_WIPHY))
return manager_genl_process_nl80211_wiphy(genl, message, manager);
if (!IN_SET(cmd, NL80211_CMD_SET_INTERFACE, NL80211_CMD_NEW_INTERFACE, NL80211_CMD_DEL_INTERFACE)) {
log_debug("nl80211: ignoring nl80211 %s(%u) message.",
strna(nl80211_cmd_to_string(cmd)), cmd);
return 0;
}
r = sd_netlink_message_read_u32(message, NL80211_ATTR_IFINDEX, &ifindex);
if (r < 0) {
log_debug_errno(r, "nl80211: received %s(%u) message without valid ifindex, ignoring: %m",
strna(nl80211_cmd_to_string(cmd)), cmd);
return 0;
}
r = link_get_by_index(manager, ifindex, &link);
if (r < 0) {
log_debug_errno(r, "nl80211: received %s(%u) message for link '%"PRIu32"' we don't know about, ignoring.",
strna(nl80211_cmd_to_string(cmd)), cmd, ifindex);
/* The NL80211_CMD_NEW_INTERFACE message might arrive before RTM_NEWLINK, in which case a
* link will not have been created yet. Store the interface index such that the wireless
* properties of the link (such as wireless interface type) are queried again after the link
* is created.
*/
if (cmd == NL80211_CMD_NEW_INTERFACE) {
r = set_ensure_put(&manager->new_wlan_ifindices, NULL, INT_TO_PTR(ifindex));
if (r < 0)
log_warning_errno(r, "Failed to add new wireless interface index to set, ignoring: %m");
} else if (cmd == NL80211_CMD_DEL_INTERFACE)
set_remove(manager->new_wlan_ifindices, INT_TO_PTR(ifindex));
return 0;
}
r = sd_netlink_message_read_string(message, NL80211_ATTR_IFNAME, &ifname);
if (r < 0) {
log_link_debug_errno(link, r, "nl80211: received %s(%u) message without valid interface name, ignoring: %m",
strna(nl80211_cmd_to_string(cmd)), cmd);
return 0;
}
if (!streq(ifname, link->ifname)) {
log_link_debug(link, "nl80211: received %s(%u) message with invalid interface name '%s', ignoring: %m",
strna(nl80211_cmd_to_string(cmd)), cmd, ifname);
return 0;
}
r = sd_netlink_message_read_u32(message, NL80211_ATTR_IFTYPE, &wlan_iftype);
if (r < 0) {
log_link_debug_errno(link, r, "nl80211: received %s(%u) message without valid wlan interface type, ignoring: %m",
strna(nl80211_cmd_to_string(cmd)), cmd);
return 0;
}
r = sd_netlink_message_read_data(message, NL80211_ATTR_SSID, &len, (void**) &ssid);
if (r < 0 && r != -ENODATA) {
log_link_debug_errno(link, r, "nl80211: received %s(%u) message without valid SSID, ignoring: %m",
strna(nl80211_cmd_to_string(cmd)), cmd);
return 0;
}
if (r >= 0) {
if (len == 0) {
log_link_debug(link, "nl80211: received SSID has zero length, ignoring it: %m");
ssid = mfree(ssid);
} else if (strlen_ptr(ssid) != len) {
log_link_debug(link, "nl80211: received SSID contains NUL characters, ignoring it.");
ssid = mfree(ssid);
}
}
log_link_debug(link, "nl80211: received %s(%u) message: iftype=%s, ssid=%s",
strna(nl80211_cmd_to_string(cmd)), cmd,
strna(nl80211_iftype_to_string(wlan_iftype)), strna(ssid));
switch (cmd) {
case NL80211_CMD_SET_INTERFACE:
case NL80211_CMD_NEW_INTERFACE:
link->wlan_iftype = wlan_iftype;
free_and_replace(link->ssid, ssid);
break;
case NL80211_CMD_DEL_INTERFACE:
link->wlan_iftype = NL80211_IFTYPE_UNSPECIFIED;
link->ssid = mfree(link->ssid);
break;
default:
assert_not_reached();
}
return 0;
}
int manager_genl_process_nl80211_mlme(sd_netlink *genl, sd_netlink_message *message, Manager *manager) {
const char *family;
uint32_t ifindex;
uint8_t cmd;
Link *link;
int r;
assert(genl);
assert(message);
assert(manager);
if (sd_netlink_message_is_error(message)) {
r = sd_netlink_message_get_errno(message);
if (r < 0)
log_message_warning_errno(message, r, "nl80211: received error message, ignoring");
return 0;
}
r = sd_genl_message_get_family_name(genl, message, &family);
if (r < 0) {
log_debug_errno(r, "nl80211: failed to determine genl family, ignoring: %m");
return 0;
}
if (!streq(family, NL80211_GENL_NAME)) {
log_debug("nl80211: Received message of unexpected genl family '%s', ignoring.", family);
return 0;
}
r = sd_genl_message_get_command(genl, message, &cmd);
if (r < 0) {
log_debug_errno(r, "nl80211: failed to determine genl message command, ignoring: %m");
return 0;
}
r = sd_netlink_message_read_u32(message, NL80211_ATTR_IFINDEX, &ifindex);
if (r < 0) {
log_debug_errno(r, "nl80211: received %s(%u) message without valid ifindex, ignoring: %m",
strna(nl80211_cmd_to_string(cmd)), cmd);
return 0;
}
r = link_get_by_index(manager, ifindex, &link);
if (r < 0) {
log_debug_errno(r, "nl80211: received %s(%u) message for link '%"PRIu32"' we don't know about, ignoring.",
strna(nl80211_cmd_to_string(cmd)), cmd, ifindex);
return 0;
}
switch (cmd) {
case NL80211_CMD_NEW_STATION:
case NL80211_CMD_DEL_STATION: {
struct ether_addr bssid;
r = sd_netlink_message_read_ether_addr(message, NL80211_ATTR_MAC, &bssid);
if (r < 0) {
log_link_debug_errno(link, r, "nl80211: received %s(%u) message without valid BSSID, ignoring: %m",
strna(nl80211_cmd_to_string(cmd)), cmd);
return 0;
}
log_link_debug(link, "nl80211: received %s(%u) message: bssid=%s",
strna(nl80211_cmd_to_string(cmd)), cmd, ETHER_ADDR_TO_STR(&bssid));
if (cmd == NL80211_CMD_DEL_STATION) {
link->bssid = ETHER_ADDR_NULL;
return 0;
}
link->bssid = bssid;
if (manager->enumerating &&
link->wlan_iftype == NL80211_IFTYPE_STATION && link->ssid)
log_link_info(link, "Connected WiFi access point: %s (%s)",
link->ssid, ETHER_ADDR_TO_STR(&link->bssid));
break;
}
case NL80211_CMD_CONNECT: {
struct ether_addr bssid;
uint16_t status_code;
r = sd_netlink_message_read_ether_addr(message, NL80211_ATTR_MAC, &bssid);
if (r < 0 && r != -ENODATA) {
log_link_debug_errno(link, r, "nl80211: received %s(%u) message without valid BSSID, ignoring: %m",
strna(nl80211_cmd_to_string(cmd)), cmd);
return 0;
}
r = sd_netlink_message_read_u16(message, NL80211_ATTR_STATUS_CODE, &status_code);
if (r < 0) {
log_link_debug_errno(link, r, "nl80211: received %s(%u) message without valid status code, ignoring: %m",
strna(nl80211_cmd_to_string(cmd)), cmd);
return 0;
}
log_link_debug(link, "nl80211: received %s(%u) message: status=%u, bssid=%s",
strna(nl80211_cmd_to_string(cmd)), cmd, status_code, ETHER_ADDR_TO_STR(&bssid));
if (status_code != 0)
return 0;
link->bssid = bssid;
if (!manager->enumerating) {
r = link_get_wlan_interface(link);
if (r < 0) {
log_link_warning_errno(link, r, "Failed to update wireless LAN interface: %m");
link_enter_failed(link);
return 0;
}
}
if (link->wlan_iftype == NL80211_IFTYPE_STATION && link->ssid)
log_link_info(link, "Connected WiFi access point: %s (%s)",
link->ssid, ETHER_ADDR_TO_STR(&link->bssid));
/* Sometimes, RTM_NEWLINK message with carrier is received earlier than NL80211_CMD_CONNECT.
* To make SSID= or other WiFi related settings in [Match] section work, let's try to
* reconfigure the interface. */
if (link->ssid && link_has_carrier(link)) {
r = link_reconfigure_impl(link, /* force = */ false);
if (r < 0) {
log_link_warning_errno(link, r, "Failed to reconfigure interface: %m");
link_enter_failed(link);
return 0;
}
}
break;
}
case NL80211_CMD_DISCONNECT:
log_link_debug(link, "nl80211: received %s(%u) message.",
strna(nl80211_cmd_to_string(cmd)), cmd);
link->bssid = ETHER_ADDR_NULL;
free_and_replace(link->previous_ssid, link->ssid);
break;
case NL80211_CMD_START_AP: {
log_link_debug(link, "nl80211: received %s(%u) message.",
strna(nl80211_cmd_to_string(cmd)), cmd);
/* No need to reconfigure during enumeration */
if (manager->enumerating)
break;
/* If there is no carrier, let the link get configured on
* carrier gain instead */
if (!link_has_carrier(link))
break;
/* AP start event may indicate different properties (e.g. SSID) */
r = link_get_wlan_interface(link);
if (r < 0) {
log_link_warning_errno(link, r, "Failed to update wireless LAN interface: %m");
link_enter_failed(link);
return 0;
}
/* If necessary, reconfigure based on those new properties */
r = link_reconfigure_impl(link, /* force = */ false);
if (r < 0) {
log_link_warning_errno(link, r, "Failed to reconfigure interface: %m");
link_enter_failed(link);
return 0;
}
break;
}
default:
log_link_debug(link, "nl80211: received %s(%u) message.",
strna(nl80211_cmd_to_string(cmd)), cmd);
}
return 0;
}
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