diff options
Diffstat (limited to 'src/network/networkd-wifi.c')
| -rw-r--r-- | src/network/networkd-wifi.c | 345 |
1 files changed, 345 insertions, 0 deletions
diff --git a/src/network/networkd-wifi.c b/src/network/networkd-wifi.c new file mode 100644 index 0000000..98e7a72 --- /dev/null +++ b/src/network/networkd-wifi.c @@ -0,0 +1,345 @@ +/* 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_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; +} |