/* SPDX-License-Identifier: LGPL-2.1-or-later */ #include #include #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_suffix0(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; }