// SPDX-License-Identifier: GPL-2.0+ /* * Copyright (C) 2005 - 2018 Red Hat, Inc. * Copyright (C) 2006 - 2008 Novell, Inc. * Copyright (C) 2011 Intel Corporation. All rights reserved. */ #include "nm-default.h" #include "nm-wifi-utils-nl80211.h" #include #include #include #include #include #include "platform/nm-netlink.h" #include "nm-wifi-utils-private.h" #include "platform/nm-platform.h" #include "platform/nm-platform-utils.h" #include "nm-utils.h" #define _NMLOG_PREFIX_NAME "wifi-nl80211" #define _NMLOG_DOMAIN LOGD_PLATFORM | LOGD_WIFI #define _NMLOG(level, ...) \ G_STMT_START { \ char _ifname_buf[IFNAMSIZ]; \ const char *_ifname = self ? nmp_utils_if_indextoname (self->parent.ifindex, _ifname_buf) : NULL; \ \ nm_log ((level), _NMLOG_DOMAIN, _ifname ?: NULL, NULL, \ "%s%s%s%s: " _NM_UTILS_MACRO_FIRST(__VA_ARGS__), \ _NMLOG_PREFIX_NAME, \ NM_PRINT_FMT_QUOTED (_ifname, " (", _ifname, ")", "") \ _NM_UTILS_MACRO_REST(__VA_ARGS__)); \ } G_STMT_END typedef struct { NMWifiUtils parent; struct nl_sock *nl_sock; guint32 *freqs; int id; int num_freqs; int phy; bool can_wowlan:1; } NMWifiUtilsNl80211; typedef struct { NMWifiUtilsClass parent; } NMWifiUtilsNl80211Class; G_DEFINE_TYPE (NMWifiUtilsNl80211, nm_wifi_utils_nl80211, NM_TYPE_WIFI_UTILS) static int ack_handler (struct nl_msg *msg, void *arg) { int *done = arg; *done = 1; return NL_STOP; } static int finish_handler (struct nl_msg *msg, void *arg) { int *done = arg; *done = 1; return NL_SKIP; } static int error_handler (struct sockaddr_nl *nla, struct nlmsgerr *err, void *arg) { int *done = arg; *done = err->error; return NL_SKIP; } static struct nl_msg * _nl80211_alloc_msg (int id, int ifindex, int phy, guint32 cmd, guint32 flags) { nm_auto_nlmsg struct nl_msg *msg = NULL; msg = nlmsg_alloc (); genlmsg_put (msg, 0, 0, id, 0, flags, cmd, 0); NLA_PUT_U32 (msg, NL80211_ATTR_IFINDEX, ifindex); if (phy != -1) NLA_PUT_U32 (msg, NL80211_ATTR_WIPHY, phy); return g_steal_pointer (&msg); nla_put_failure: g_return_val_if_reached (NULL); } static struct nl_msg * nl80211_alloc_msg (NMWifiUtilsNl80211 *self, guint32 cmd, guint32 flags) { return _nl80211_alloc_msg (self->id, self->parent.ifindex, self->phy, cmd, flags); } static int nl80211_send_and_recv (NMWifiUtilsNl80211 *self, struct nl_msg *msg, int (*valid_handler) (struct nl_msg *, void *), void *valid_data) { int err; int done = 0; const struct nl_cb cb = { .err_cb = error_handler, .err_arg = &done, .finish_cb = finish_handler, .finish_arg = &done, .ack_cb = ack_handler, .ack_arg = &done, .valid_cb = valid_handler, .valid_arg = valid_data, }; g_return_val_if_fail (msg != NULL, -ENOMEM); err = nl_send_auto (self->nl_sock, msg); if (err < 0) return err; /* Loop until one of our NL callbacks says we're done; on success * done will be 1, on error it will be < 0. */ while (!done) { err = nl_recvmsgs (self->nl_sock, &cb); if (err < 0 && err != -EAGAIN) { /* Kernel scan list can change while we are dumping it, as new scan * results from H/W can arrive. BSS info is assured to be consistent * and we don't need consistent view of whole scan list. Hence do * not warn on DUMP_INTR error for get scan command. */ if (err == -NME_NL_DUMP_INTR && genlmsg_hdr (nlmsg_hdr (msg))->cmd == NL80211_CMD_GET_SCAN) break; _LOGW ("nl_recvmsgs() error: (%d) %s", err, nm_strerror (err)); break; } } if (err >= 0 && done < 0) err = done; return err; } static void dispose (GObject *object) { NMWifiUtilsNl80211 *self = NM_WIFI_UTILS_NL80211 (object); g_clear_pointer (&self->freqs, g_free); } struct nl80211_iface_info { NM80211Mode mode; }; static int nl80211_iface_info_handler (struct nl_msg *msg, void *arg) { struct nl80211_iface_info *info = arg; struct genlmsghdr *gnlh = nlmsg_data (nlmsg_hdr (msg)); struct nlattr *tb[NL80211_ATTR_MAX + 1]; if (nla_parse_arr (tb, genlmsg_attrdata (gnlh, 0), genlmsg_attrlen (gnlh, 0), NULL) < 0) return NL_SKIP; if (!tb[NL80211_ATTR_IFTYPE]) return NL_SKIP; switch (nla_get_u32 (tb[NL80211_ATTR_IFTYPE])) { case NL80211_IFTYPE_ADHOC: info->mode = NM_802_11_MODE_ADHOC; break; case NL80211_IFTYPE_AP: info->mode = NM_802_11_MODE_AP; break; case NL80211_IFTYPE_STATION: info->mode = NM_802_11_MODE_INFRA; break; case NL80211_IFTYPE_MESH_POINT: info->mode = NM_802_11_MODE_MESH; break; } return NL_SKIP; } static NM80211Mode wifi_nl80211_get_mode (NMWifiUtils *data) { NMWifiUtilsNl80211 *self = (NMWifiUtilsNl80211 *) data; struct nl80211_iface_info iface_info = { .mode = NM_802_11_MODE_UNKNOWN, }; nm_auto_nlmsg struct nl_msg *msg = NULL; msg = nl80211_alloc_msg (self, NL80211_CMD_GET_INTERFACE, 0); if (nl80211_send_and_recv (self, msg, nl80211_iface_info_handler, &iface_info) < 0) return NM_802_11_MODE_UNKNOWN; return iface_info.mode; } static gboolean wifi_nl80211_set_mode (NMWifiUtils *data, const NM80211Mode mode) { NMWifiUtilsNl80211 *self = (NMWifiUtilsNl80211 *) data; nm_auto_nlmsg struct nl_msg *msg = NULL; int err; msg = nl80211_alloc_msg (self, NL80211_CMD_SET_INTERFACE, 0); switch (mode) { case NM_802_11_MODE_INFRA: NLA_PUT_U32 (msg, NL80211_ATTR_IFTYPE, NL80211_IFTYPE_STATION); break; case NM_802_11_MODE_ADHOC: NLA_PUT_U32 (msg, NL80211_ATTR_IFTYPE, NL80211_IFTYPE_ADHOC); break; case NM_802_11_MODE_AP: NLA_PUT_U32 (msg, NL80211_ATTR_IFTYPE, NL80211_IFTYPE_AP); break; case NM_802_11_MODE_MESH: NLA_PUT_U32 (msg, NL80211_ATTR_IFTYPE, NL80211_IFTYPE_MESH_POINT); break; default: g_assert_not_reached (); } err = nl80211_send_and_recv (self, msg, NULL, NULL); return err >= 0; nla_put_failure: g_return_val_if_reached (FALSE); } static gboolean wifi_nl80211_set_powersave (NMWifiUtils *data, guint32 powersave) { NMWifiUtilsNl80211 *self = (NMWifiUtilsNl80211 *) data; nm_auto_nlmsg struct nl_msg *msg = NULL; int err; msg = nl80211_alloc_msg (self, NL80211_CMD_SET_POWER_SAVE, 0); NLA_PUT_U32 (msg, NL80211_ATTR_PS_STATE, powersave == 1 ? NL80211_PS_ENABLED : NL80211_PS_DISABLED); err = nl80211_send_and_recv (self, msg, NULL, NULL); return err >= 0; nla_put_failure: g_return_val_if_reached (FALSE); } static int nl80211_get_wake_on_wlan_handler (struct nl_msg *msg, void *arg) { NMSettingWirelessWakeOnWLan *wowl = arg; struct nlattr *attrs[NL80211_ATTR_MAX + 1]; struct nlattr *trig[NUM_NL80211_WOWLAN_TRIG]; struct genlmsghdr *gnlh = nlmsg_data (nlmsg_hdr (msg)); nla_parse_arr (attrs, genlmsg_attrdata (gnlh, 0), genlmsg_attrlen (gnlh, 0), NULL); if (!attrs[NL80211_ATTR_WOWLAN_TRIGGERS]) return NL_SKIP; nla_parse_arr (trig, nla_data (attrs[NL80211_ATTR_WOWLAN_TRIGGERS]), nla_len (attrs[NL80211_ATTR_WOWLAN_TRIGGERS]), NULL); *wowl = NM_SETTING_WIRELESS_WAKE_ON_WLAN_NONE; if (trig[NL80211_WOWLAN_TRIG_ANY]) *wowl |= NM_SETTING_WIRELESS_WAKE_ON_WLAN_ANY; if (trig[NL80211_WOWLAN_TRIG_DISCONNECT]) *wowl |= NM_SETTING_WIRELESS_WAKE_ON_WLAN_DISCONNECT; if (trig[NL80211_WOWLAN_TRIG_MAGIC_PKT]) *wowl |= NM_SETTING_WIRELESS_WAKE_ON_WLAN_MAGIC; if (trig[NL80211_WOWLAN_TRIG_GTK_REKEY_FAILURE]) *wowl |= NM_SETTING_WIRELESS_WAKE_ON_WLAN_GTK_REKEY_FAILURE; if (trig[NL80211_WOWLAN_TRIG_EAP_IDENT_REQUEST]) *wowl |= NM_SETTING_WIRELESS_WAKE_ON_WLAN_EAP_IDENTITY_REQUEST; if (trig[NL80211_WOWLAN_TRIG_4WAY_HANDSHAKE]) *wowl |= NM_SETTING_WIRELESS_WAKE_ON_WLAN_4WAY_HANDSHAKE; if (trig[NL80211_WOWLAN_TRIG_RFKILL_RELEASE]) *wowl |= NM_SETTING_WIRELESS_WAKE_ON_WLAN_RFKILL_RELEASE; if (trig[NL80211_WOWLAN_TRIG_TCP_CONNECTION]) *wowl |= NM_SETTING_WIRELESS_WAKE_ON_WLAN_TCP; return NL_SKIP; } static NMSettingWirelessWakeOnWLan wifi_nl80211_get_wake_on_wlan (NMWifiUtils *data) { NMWifiUtilsNl80211 *self = (NMWifiUtilsNl80211 *) data; NMSettingWirelessWakeOnWLan wowl = NM_SETTING_WIRELESS_WAKE_ON_WLAN_IGNORE; nm_auto_nlmsg struct nl_msg *msg = NULL; msg = nl80211_alloc_msg (self, NL80211_CMD_GET_WOWLAN, 0); nl80211_send_and_recv (self, msg, nl80211_get_wake_on_wlan_handler, &wowl); return wowl; } static gboolean wifi_nl80211_set_wake_on_wlan (NMWifiUtils *data, NMSettingWirelessWakeOnWLan wowl) { NMWifiUtilsNl80211 *self = (NMWifiUtilsNl80211 *) data; nm_auto_nlmsg struct nl_msg *msg = NULL; struct nlattr *triggers; int err; if (wowl == NM_SETTING_WIRELESS_WAKE_ON_WLAN_IGNORE) return TRUE; msg = nl80211_alloc_msg (self, NL80211_CMD_SET_WOWLAN, 0); triggers = nla_nest_start (msg, NL80211_ATTR_WOWLAN_TRIGGERS); if (!triggers) goto nla_put_failure; if (NM_FLAGS_HAS (wowl, NM_SETTING_WIRELESS_WAKE_ON_WLAN_ANY)) NLA_PUT_FLAG (msg, NL80211_WOWLAN_TRIG_ANY); if (NM_FLAGS_HAS (wowl, NM_SETTING_WIRELESS_WAKE_ON_WLAN_DISCONNECT)) NLA_PUT_FLAG (msg, NL80211_WOWLAN_TRIG_DISCONNECT); if (NM_FLAGS_HAS (wowl, NM_SETTING_WIRELESS_WAKE_ON_WLAN_MAGIC)) NLA_PUT_FLAG (msg, NL80211_WOWLAN_TRIG_MAGIC_PKT); if (NM_FLAGS_HAS (wowl, NM_SETTING_WIRELESS_WAKE_ON_WLAN_GTK_REKEY_FAILURE)) NLA_PUT_FLAG (msg, NL80211_WOWLAN_TRIG_GTK_REKEY_FAILURE); if (NM_FLAGS_HAS (wowl, NM_SETTING_WIRELESS_WAKE_ON_WLAN_EAP_IDENTITY_REQUEST)) NLA_PUT_FLAG (msg, NL80211_WOWLAN_TRIG_EAP_IDENT_REQUEST); if (NM_FLAGS_HAS (wowl, NM_SETTING_WIRELESS_WAKE_ON_WLAN_4WAY_HANDSHAKE)) NLA_PUT_FLAG (msg, NL80211_WOWLAN_TRIG_4WAY_HANDSHAKE); if (NM_FLAGS_HAS (wowl, NM_SETTING_WIRELESS_WAKE_ON_WLAN_RFKILL_RELEASE)) NLA_PUT_FLAG (msg, NL80211_WOWLAN_TRIG_RFKILL_RELEASE); nla_nest_end (msg, triggers); err = nl80211_send_and_recv (self, msg, NULL, NULL); return err >= 0; nla_put_failure: g_return_val_if_reached (FALSE); } /* @divisor: pass what value @xbm should be divided by to get dBm */ static guint32 nl80211_xbm_to_percent (gint32 xbm, guint32 divisor) { #define NOISE_FLOOR_DBM -90 #define SIGNAL_MAX_DBM -20 xbm /= divisor; xbm = CLAMP (xbm, NOISE_FLOOR_DBM, SIGNAL_MAX_DBM); return 100 - 70 * (((float) SIGNAL_MAX_DBM - (float) xbm) / ((float) SIGNAL_MAX_DBM - (float) NOISE_FLOOR_DBM)); } struct nl80211_bss_info { guint32 freq; guint8 bssid[ETH_ALEN]; guint8 ssid[32]; guint32 ssid_len; guint32 beacon_signal; gboolean valid; }; #define WLAN_EID_SSID 0 static void find_ssid (guint8 *ies, guint32 ies_len, guint8 **ssid, guint32 *ssid_len) { *ssid = NULL; *ssid_len = 0; while (ies_len > 2 && ies[0] != WLAN_EID_SSID) { ies_len -= ies[1] + 2; ies += ies[1] + 2; } if (ies_len < 2) return; if (ies_len < 2 + ies[1]) return; *ssid_len = ies[1]; *ssid = ies + 2; } static int nl80211_bss_dump_handler (struct nl_msg *msg, void *arg) { static const struct nla_policy bss_policy[] = { [NL80211_BSS_TSF] = { .type = NLA_U64 }, [NL80211_BSS_FREQUENCY] = { .type = NLA_U32 }, [NL80211_BSS_BSSID] = { .minlen = ETH_ALEN }, [NL80211_BSS_BEACON_INTERVAL] = { .type = NLA_U16 }, [NL80211_BSS_CAPABILITY] = { .type = NLA_U16 }, [NL80211_BSS_INFORMATION_ELEMENTS] = { }, [NL80211_BSS_SIGNAL_MBM] = { .type = NLA_U32 }, [NL80211_BSS_SIGNAL_UNSPEC] = { .type = NLA_U8 }, [NL80211_BSS_STATUS] = { .type = NLA_U32 }, }; struct nl80211_bss_info *info = arg; struct genlmsghdr *gnlh = nlmsg_data (nlmsg_hdr (msg)); struct nlattr *tb[NL80211_ATTR_MAX + 1]; struct nlattr *bss[G_N_ELEMENTS (bss_policy)]; guint32 status; if (nla_parse_arr (tb, genlmsg_attrdata (gnlh, 0), genlmsg_attrlen (gnlh, 0), NULL) < 0) return NL_SKIP; if (tb[NL80211_ATTR_BSS] == NULL) return NL_SKIP; if (nla_parse_nested_arr (bss, tb[NL80211_ATTR_BSS], bss_policy)) return NL_SKIP; if (bss[NL80211_BSS_STATUS] == NULL) return NL_SKIP; status = nla_get_u32 (bss[NL80211_BSS_STATUS]); if (status != NL80211_BSS_STATUS_ASSOCIATED && status != NL80211_BSS_STATUS_IBSS_JOINED) return NL_SKIP; if (bss[NL80211_BSS_BSSID] == NULL) return NL_SKIP; memcpy (info->bssid, nla_data (bss[NL80211_BSS_BSSID]), ETH_ALEN); if (bss[NL80211_BSS_FREQUENCY]) info->freq = nla_get_u32 (bss[NL80211_BSS_FREQUENCY]); if (bss[NL80211_BSS_SIGNAL_UNSPEC]) info->beacon_signal = nla_get_u8 (bss[NL80211_BSS_SIGNAL_UNSPEC]); if (bss[NL80211_BSS_SIGNAL_MBM]) info->beacon_signal = nl80211_xbm_to_percent (nla_get_u32 (bss[NL80211_BSS_SIGNAL_MBM]), 100); if (bss[NL80211_BSS_INFORMATION_ELEMENTS]) { guint8 *ssid; guint32 ssid_len; find_ssid (nla_data (bss[NL80211_BSS_INFORMATION_ELEMENTS]), nla_len (bss[NL80211_BSS_INFORMATION_ELEMENTS]), &ssid, &ssid_len); if ( ssid && ssid_len && ssid_len <= sizeof (info->ssid)) { memcpy (info->ssid, ssid, ssid_len); info->ssid_len = ssid_len; } } info->valid = TRUE; return NL_SKIP; } static void nl80211_get_bss_info (NMWifiUtilsNl80211 *self, struct nl80211_bss_info *bss_info) { nm_auto_nlmsg struct nl_msg *msg = NULL; memset (bss_info, 0, sizeof (*bss_info)); msg = nl80211_alloc_msg (self, NL80211_CMD_GET_SCAN, NLM_F_DUMP); nl80211_send_and_recv (self, msg, nl80211_bss_dump_handler, bss_info); } static guint32 wifi_nl80211_get_freq (NMWifiUtils *data) { NMWifiUtilsNl80211 *self = (NMWifiUtilsNl80211 *) data; struct nl80211_bss_info bss_info; nl80211_get_bss_info (self, &bss_info); return bss_info.freq; } static guint32 wifi_nl80211_find_freq (NMWifiUtils *data, const guint32 *freqs) { NMWifiUtilsNl80211 *self = (NMWifiUtilsNl80211 *) data; int i; for (i = 0; i < self->num_freqs; i++) { while (*freqs) { if (self->freqs[i] == *freqs) return *freqs; freqs++; } } return 0; } static gboolean wifi_nl80211_get_bssid (NMWifiUtils *data, guint8 *out_bssid) { NMWifiUtilsNl80211 *self = (NMWifiUtilsNl80211 *) data; struct nl80211_bss_info bss_info; nl80211_get_bss_info (self, &bss_info); if (bss_info.valid) memcpy (out_bssid, bss_info.bssid, ETH_ALEN); return bss_info.valid; } struct nl80211_station_info { guint32 txrate; gboolean txrate_valid; guint8 signal; gboolean signal_valid; }; static int nl80211_station_handler (struct nl_msg *msg, void *arg) { static const struct nla_policy stats_policy[] = { [NL80211_STA_INFO_INACTIVE_TIME] = { .type = NLA_U32 }, [NL80211_STA_INFO_RX_BYTES] = { .type = NLA_U32 }, [NL80211_STA_INFO_TX_BYTES] = { .type = NLA_U32 }, [NL80211_STA_INFO_RX_PACKETS] = { .type = NLA_U32 }, [NL80211_STA_INFO_TX_PACKETS] = { .type = NLA_U32 }, [NL80211_STA_INFO_SIGNAL] = { .type = NLA_U8 }, [NL80211_STA_INFO_TX_BITRATE] = { .type = NLA_NESTED }, [NL80211_STA_INFO_LLID] = { .type = NLA_U16 }, [NL80211_STA_INFO_PLID] = { .type = NLA_U16 }, [NL80211_STA_INFO_PLINK_STATE] = { .type = NLA_U8 }, }; static const struct nla_policy rate_policy[] = { [NL80211_RATE_INFO_BITRATE] = { .type = NLA_U16 }, [NL80211_RATE_INFO_MCS] = { .type = NLA_U8 }, [NL80211_RATE_INFO_40_MHZ_WIDTH] = { .type = NLA_FLAG }, [NL80211_RATE_INFO_SHORT_GI] = { .type = NLA_FLAG }, }; struct nlattr *rinfo[G_N_ELEMENTS (rate_policy)]; struct nlattr *sinfo[G_N_ELEMENTS (stats_policy)]; struct nl80211_station_info *info = arg; struct nlattr *tb[NL80211_ATTR_MAX + 1]; struct genlmsghdr *gnlh = nlmsg_data (nlmsg_hdr (msg)); if (nla_parse_arr (tb, genlmsg_attrdata (gnlh, 0), genlmsg_attrlen (gnlh, 0), NULL) < 0) return NL_SKIP; if (tb[NL80211_ATTR_STA_INFO] == NULL) return NL_SKIP; if (nla_parse_nested_arr (sinfo, tb[NL80211_ATTR_STA_INFO], stats_policy)) return NL_SKIP; if (sinfo[NL80211_STA_INFO_TX_BITRATE] == NULL) return NL_SKIP; if (nla_parse_nested_arr (rinfo, sinfo[NL80211_STA_INFO_TX_BITRATE], rate_policy)) return NL_SKIP; if (rinfo[NL80211_RATE_INFO_BITRATE] == NULL) return NL_SKIP; /* convert from nl80211's units of 100kbps to NM's kbps */ info->txrate = nla_get_u16 (rinfo[NL80211_RATE_INFO_BITRATE]) * 100; info->txrate_valid = TRUE; if (sinfo[NL80211_STA_INFO_SIGNAL] != NULL) { info->signal = nl80211_xbm_to_percent ((gint8) nla_get_u8 (sinfo[NL80211_STA_INFO_SIGNAL]), 1); info->signal_valid = TRUE; } return NL_SKIP; } static void nl80211_get_ap_info (NMWifiUtilsNl80211 *self, struct nl80211_station_info *sta_info) { nm_auto_nlmsg struct nl_msg *msg = NULL; struct nl80211_bss_info bss_info; memset (sta_info, 0, sizeof (*sta_info)); nl80211_get_bss_info (self, &bss_info); if (!bss_info.valid) return; msg = nl80211_alloc_msg (self, NL80211_CMD_GET_STATION, 0); NLA_PUT (msg, NL80211_ATTR_MAC, ETH_ALEN, bss_info.bssid); nl80211_send_and_recv (self, msg, nl80211_station_handler, sta_info); if (!sta_info->signal_valid) { /* Fall back to bss_info signal quality (both are in percent) */ sta_info->signal = bss_info.beacon_signal; } return; nla_put_failure: g_return_if_reached (); } static guint32 wifi_nl80211_get_rate (NMWifiUtils *data) { NMWifiUtilsNl80211 *self = (NMWifiUtilsNl80211 *) data; struct nl80211_station_info sta_info; nl80211_get_ap_info (self, &sta_info); return sta_info.txrate; } static int wifi_nl80211_get_qual (NMWifiUtils *data) { NMWifiUtilsNl80211 *self = (NMWifiUtilsNl80211 *) data; struct nl80211_station_info sta_info; nl80211_get_ap_info (self, &sta_info); return sta_info.signal; } static gboolean wifi_nl80211_indicate_addressing_running (NMWifiUtils *data, gboolean running) { NMWifiUtilsNl80211 *self = (NMWifiUtilsNl80211 *) data; nm_auto_nlmsg struct nl_msg *msg = NULL; int err; msg = nl80211_alloc_msg (self, running ? 98 /* NL80211_CMD_CRIT_PROTOCOL_START */ : 99 /* NL80211_CMD_CRIT_PROTOCOL_STOP */, 0); /* Despite the DHCP name, we're using this for any type of IP addressing, * DHCPv4, DHCPv6, and IPv6 SLAAC. */ NLA_PUT_U16 (msg, 179 /* NL80211_ATTR_CRIT_PROT_ID */, 1 /* NL80211_CRIT_PROTO_DHCP */); if (running) { /* Give DHCP 5 seconds to complete */ NLA_PUT_U16 (msg, 180 /* NL80211_ATTR_MAX_CRIT_PROT_DURATION */, 5000); } err = nl80211_send_and_recv (self, msg, NULL, NULL); return err >= 0; nla_put_failure: g_return_val_if_reached (FALSE); } struct nl80211_device_info { NMWifiUtilsNl80211 *self; int phy; guint32 *freqs; int num_freqs; guint32 freq; guint32 caps; gboolean can_scan; gboolean can_scan_ssid; gboolean supported; gboolean success; gboolean can_wowlan; }; #define WLAN_CIPHER_SUITE_USE_GROUP 0x000FAC00 #define WLAN_CIPHER_SUITE_WEP40 0x000FAC01 #define WLAN_CIPHER_SUITE_TKIP 0x000FAC02 #define WLAN_CIPHER_SUITE_CCMP 0x000FAC04 #define WLAN_CIPHER_SUITE_WEP104 0x000FAC05 #define WLAN_CIPHER_SUITE_AES_CMAC 0x000FAC06 #define WLAN_CIPHER_SUITE_GCMP 0x000FAC08 #define WLAN_CIPHER_SUITE_SMS4 0x00147201 static int nl80211_wiphy_info_handler (struct nl_msg *msg, void *arg) { static const struct nla_policy freq_policy[] = { [NL80211_FREQUENCY_ATTR_FREQ] = { .type = NLA_U32 }, [NL80211_FREQUENCY_ATTR_DISABLED] = { .type = NLA_FLAG }, #ifdef NL80211_FREQUENCY_ATTR_NO_IR [NL80211_FREQUENCY_ATTR_NO_IR] = { .type = NLA_FLAG }, #else [NL80211_FREQUENCY_ATTR_PASSIVE_SCAN] = { .type = NLA_FLAG }, [NL80211_FREQUENCY_ATTR_NO_IBSS] = { .type = NLA_FLAG }, #endif [NL80211_FREQUENCY_ATTR_RADAR] = { .type = NLA_FLAG }, [NL80211_FREQUENCY_ATTR_MAX_TX_POWER] = { .type = NLA_U32 }, }; struct nlattr *tb[NL80211_ATTR_MAX + 1]; struct genlmsghdr *gnlh = nlmsg_data (nlmsg_hdr (msg)); struct nl80211_device_info *info = arg; NMWifiUtilsNl80211 *self = info->self; struct nlattr *tb_band[NL80211_BAND_ATTR_MAX + 1]; struct nlattr *tb_freq[G_N_ELEMENTS (freq_policy)]; struct nlattr *nl_band; struct nlattr *nl_freq; int rem_freq; int rem_band; int freq_idx; #ifdef NL80211_FREQUENCY_ATTR_NO_IR G_STATIC_ASSERT_EXPR (NL80211_FREQUENCY_ATTR_PASSIVE_SCAN == NL80211_FREQUENCY_ATTR_NO_IR && NL80211_FREQUENCY_ATTR_NO_IBSS == NL80211_FREQUENCY_ATTR_NO_IR); #else G_STATIC_ASSERT_EXPR (NL80211_FREQUENCY_ATTR_PASSIVE_SCAN != NL80211_FREQUENCY_ATTR_NO_IBSS); #endif if (nla_parse_arr (tb, genlmsg_attrdata (gnlh, 0), genlmsg_attrlen (gnlh, 0), NULL) < 0) return NL_SKIP; if ( tb[NL80211_ATTR_WIPHY] == NULL || tb[NL80211_ATTR_WIPHY_BANDS] == NULL) return NL_SKIP; info->phy = nla_get_u32 (tb[NL80211_ATTR_WIPHY]); if (tb[NL80211_ATTR_WIPHY_FREQ]) info->freq = nla_get_u32 (tb[NL80211_ATTR_WIPHY_FREQ]); else info->freq = 0; if (tb[NL80211_ATTR_MAX_NUM_SCAN_SSIDS]) { info->can_scan_ssid = nla_get_u8 (tb[NL80211_ATTR_MAX_NUM_SCAN_SSIDS]) > 0; } else { /* old kernel that only had mac80211, so assume it can */ info->can_scan_ssid = TRUE; } if (tb[NL80211_ATTR_SUPPORTED_COMMANDS]) { struct nlattr *nl_cmd; int i; nla_for_each_nested (nl_cmd, tb[NL80211_ATTR_SUPPORTED_COMMANDS], i) { switch (nla_get_u32 (nl_cmd)) { case NL80211_CMD_TRIGGER_SCAN: info->can_scan = TRUE; break; case NL80211_CMD_CONNECT: case NL80211_CMD_AUTHENTICATE: /* Only devices that support CONNECT or AUTH actually support * 802.11, unlike say ipw2x00 (up to at least kernel 3.4) which * has minimal info support, but no actual command support. * This check mirrors what wpa_supplicant does to determine * whether or not to use the nl80211 driver. */ info->supported = TRUE; break; default: break; } } } /* Find number of supported frequencies */ info->num_freqs = 0; nla_for_each_nested (nl_band, tb[NL80211_ATTR_WIPHY_BANDS], rem_band) { if (nla_parse_nested_arr (tb_band, nl_band, NULL) < 0) return NL_SKIP; nla_for_each_nested (nl_freq, tb_band[NL80211_BAND_ATTR_FREQS], rem_freq) { if (nla_parse_nested_arr (tb_freq, nl_freq, freq_policy) < 0) continue; if (!tb_freq[NL80211_FREQUENCY_ATTR_FREQ]) continue; info->num_freqs++; } } /* Read supported frequencies */ info->freqs = g_malloc0 (sizeof (guint32) * info->num_freqs); freq_idx = 0; nla_for_each_nested (nl_band, tb[NL80211_ATTR_WIPHY_BANDS], rem_band) { if (nla_parse_nested_arr (tb_band, nl_band, NULL) < 0) return NL_SKIP; nla_for_each_nested (nl_freq, tb_band[NL80211_BAND_ATTR_FREQS], rem_freq) { if (nla_parse_nested_arr (tb_freq, nl_freq, freq_policy) < 0) continue; if (!tb_freq[NL80211_FREQUENCY_ATTR_FREQ]) continue; info->freqs[freq_idx] = nla_get_u32 (tb_freq[NL80211_FREQUENCY_ATTR_FREQ]); info->caps |= NM_WIFI_DEVICE_CAP_FREQ_VALID; if (info->freqs[freq_idx] > 2400 && info->freqs[freq_idx] < 2500) info->caps |= NM_WIFI_DEVICE_CAP_FREQ_2GHZ; if (info->freqs[freq_idx] > 4900 && info->freqs[freq_idx] < 6000) info->caps |= NM_WIFI_DEVICE_CAP_FREQ_5GHZ; freq_idx++; } } /* Read security/encryption support */ if (tb[NL80211_ATTR_CIPHER_SUITES]) { guint32 *ciphers = nla_data (tb[NL80211_ATTR_CIPHER_SUITES]); guint i, num; num = nla_len (tb[NL80211_ATTR_CIPHER_SUITES]) / sizeof (guint32); for (i = 0; i < num; i++) { switch (ciphers[i]) { case WLAN_CIPHER_SUITE_WEP40: info->caps |= NM_WIFI_DEVICE_CAP_CIPHER_WEP40; break; case WLAN_CIPHER_SUITE_WEP104: info->caps |= NM_WIFI_DEVICE_CAP_CIPHER_WEP104; break; case WLAN_CIPHER_SUITE_TKIP: info->caps |= (NM_WIFI_DEVICE_CAP_CIPHER_TKIP | NM_WIFI_DEVICE_CAP_WPA); break; case WLAN_CIPHER_SUITE_CCMP: info->caps |= (NM_WIFI_DEVICE_CAP_CIPHER_CCMP | NM_WIFI_DEVICE_CAP_RSN); break; case WLAN_CIPHER_SUITE_AES_CMAC: case WLAN_CIPHER_SUITE_GCMP: case WLAN_CIPHER_SUITE_SMS4: break; default: _LOGD ("don't know the meaning of NL80211_ATTR_CIPHER_SUITE %#8.8x.", ciphers[i]); break; } } } if (tb[NL80211_ATTR_SUPPORTED_IFTYPES]) { struct nlattr *nl_mode; int i; nla_for_each_nested (nl_mode, tb[NL80211_ATTR_SUPPORTED_IFTYPES], i) { switch (nla_type (nl_mode)) { case NL80211_IFTYPE_AP: info->caps |= NM_WIFI_DEVICE_CAP_AP; break; case NL80211_IFTYPE_ADHOC: info->caps |= NM_WIFI_DEVICE_CAP_ADHOC; break; case NL80211_IFTYPE_MESH_POINT: info->caps |= NM_WIFI_DEVICE_CAP_MESH; break; } } } if (tb[NL80211_ATTR_WOWLAN_TRIGGERS_SUPPORTED]) info->can_wowlan = TRUE; if (tb[NL80211_ATTR_SUPPORT_IBSS_RSN]) info->caps |= NM_WIFI_DEVICE_CAP_IBSS_RSN; info->success = TRUE; return NL_SKIP; } static guint32 wifi_nl80211_get_mesh_channel (NMWifiUtils *data) { NMWifiUtilsNl80211 *self = (NMWifiUtilsNl80211 *) data; nm_auto_nlmsg struct nl_msg *msg = NULL; struct nl80211_device_info device_info = { .self = self }; int i; msg = nl80211_alloc_msg (self, NL80211_CMD_GET_WIPHY, 0); if (nl80211_send_and_recv (self, msg, nl80211_wiphy_info_handler, &device_info) < 0) { _LOGW ("NL80211_CMD_GET_WIPHY request failed"); return 0; } for (i = 0; i < self->num_freqs; i++) { if (device_info.freq == self->freqs[i]) return i + 1; } return 0; } static gboolean wifi_nl80211_set_mesh_channel (NMWifiUtils *data, guint32 channel) { NMWifiUtilsNl80211 *self = (NMWifiUtilsNl80211 *) data; nm_auto_nlmsg struct nl_msg *msg = NULL; int err; if (channel > self->num_freqs) return FALSE; msg = nl80211_alloc_msg (self, NL80211_CMD_SET_WIPHY, 0); NLA_PUT_U32 (msg, NL80211_ATTR_WIPHY_FREQ, self->freqs[channel - 1]); err = nl80211_send_and_recv (self, msg, NULL, NULL); return err >= 0; nla_put_failure: g_return_val_if_reached (FALSE); } static gboolean wifi_nl80211_set_mesh_ssid (NMWifiUtils *data, const guint8 *ssid, gsize len) { NMWifiUtilsNl80211 *self = (NMWifiUtilsNl80211 *) data; nm_auto_nlmsg struct nl_msg *msg = NULL; int err; msg = nl80211_alloc_msg (self, NL80211_CMD_SET_INTERFACE, 0); NLA_PUT (msg, NL80211_ATTR_MESH_ID, len, ssid); err = nl80211_send_and_recv (self, msg, NULL, NULL); return err >= 0; nla_put_failure: g_return_val_if_reached (FALSE); } static void nm_wifi_utils_nl80211_init (NMWifiUtilsNl80211 *self) { } static void nm_wifi_utils_nl80211_class_init (NMWifiUtilsNl80211Class *klass) { GObjectClass *object_class = G_OBJECT_CLASS (klass); NMWifiUtilsClass *wifi_utils_class = NM_WIFI_UTILS_CLASS (klass); object_class->dispose = dispose; wifi_utils_class->get_mode = wifi_nl80211_get_mode; wifi_utils_class->set_mode = wifi_nl80211_set_mode; wifi_utils_class->set_powersave = wifi_nl80211_set_powersave; wifi_utils_class->get_wake_on_wlan = wifi_nl80211_get_wake_on_wlan, wifi_utils_class->set_wake_on_wlan = wifi_nl80211_set_wake_on_wlan, wifi_utils_class->get_freq = wifi_nl80211_get_freq; wifi_utils_class->find_freq = wifi_nl80211_find_freq; wifi_utils_class->get_bssid = wifi_nl80211_get_bssid; wifi_utils_class->get_rate = wifi_nl80211_get_rate; wifi_utils_class->get_qual = wifi_nl80211_get_qual; wifi_utils_class->indicate_addressing_running = wifi_nl80211_indicate_addressing_running; wifi_utils_class->get_mesh_channel = wifi_nl80211_get_mesh_channel; wifi_utils_class->set_mesh_channel = wifi_nl80211_set_mesh_channel; wifi_utils_class->set_mesh_ssid = wifi_nl80211_set_mesh_ssid; } NMWifiUtils * nm_wifi_utils_nl80211_new (int ifindex, struct nl_sock *genl) { gs_unref_object NMWifiUtilsNl80211 *self = NULL; nm_auto_nlmsg struct nl_msg *msg = NULL; struct nl80211_device_info device_info = { }; if (!genl) return NULL; self = g_object_new (NM_TYPE_WIFI_UTILS_NL80211, NULL); self->parent.ifindex = ifindex; self->nl_sock = genl; self->id = genl_ctrl_resolve (self->nl_sock, "nl80211"); if (self->id < 0) { _LOGD ("genl_ctrl_resolve: failed to resolve \"nl80211\""); return NULL; } self->phy = -1; msg = nl80211_alloc_msg (self, NL80211_CMD_GET_WIPHY, 0); device_info.self = self; if (nl80211_send_and_recv (self, msg, nl80211_wiphy_info_handler, &device_info) < 0) { _LOGD ("NL80211_CMD_GET_WIPHY request failed"); return NULL; } if (!device_info.success) { _LOGD ("NL80211_CMD_GET_WIPHY request indicated failure"); return NULL; } if (!device_info.supported) { _LOGD ("driver does not fully support nl80211, falling back to WEXT"); return NULL; } if (!device_info.can_scan_ssid) { _LOGE ("driver does not support SSID scans"); return NULL; } if (device_info.num_freqs == 0 || device_info.freqs == NULL) { _LOGE ("driver reports no supported frequencies"); return NULL; } if (device_info.caps == 0) { _LOGE ("driver doesn't report support of any encryption"); return NULL; } self->phy = device_info.phy; self->freqs = device_info.freqs; self->num_freqs = device_info.num_freqs; self->parent.caps = device_info.caps; self->can_wowlan = device_info.can_wowlan; _LOGD ("using nl80211 for Wi-Fi device control"); return (NMWifiUtils *) g_steal_pointer (&self); }