/* * * Wireless daemon for Linux * * Copyright (C) 2017-2019 Intel Corporation. All rights reserved. * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA * */ #ifdef HAVE_CONFIG_H #include #endif #include #include #include #include "linux/nl80211.h" #include "src/iwd.h" #include "src/scan.h" #include "src/device.h" #include "src/netdev.h" #include "src/wiphy.h" #include "src/crypto.h" #include "src/ie.h" #include "src/mpdu.h" #include "src/util.h" #include "src/eapol.h" #include "src/handshake.h" #include "src/dbus.h" #include "src/nl80211util.h" struct ap_state { struct netdev *netdev; struct l_genl_family *nl80211; char *ssid; uint8_t channel; unsigned int ciphers; enum ie_rsn_cipher_suite group_cipher; uint32_t beacon_interval; struct l_uintset *rates; uint8_t pmk[32]; struct l_queue *frame_watch_ids; uint32_t start_stop_cmd_id; uint8_t gtk[CRYPTO_MAX_GTK_LEN]; uint8_t gtk_index; uint16_t last_aid; struct l_queue *sta_states; struct l_dbus_message *pending; bool started : 1; bool gtk_set : 1; }; struct sta_state { uint8_t addr[6]; bool associated; bool rsna; uint16_t aid; struct mmpdu_field_capability capability; uint16_t listen_interval; struct l_uintset *rates; uint32_t assoc_resp_cmd_id; struct ap_state *ap; uint8_t *assoc_rsne; struct eapol_sm *sm; struct handshake_state *hs; uint32_t gtk_query_cmd_id; }; static uint32_t netdev_watch; static void ap_sta_free(void *data) { struct sta_state *sta = data; struct ap_state *ap = sta->ap; l_uintset_free(sta->rates); l_free(sta->assoc_rsne); if (sta->assoc_resp_cmd_id) l_genl_family_cancel(ap->nl80211, sta->assoc_resp_cmd_id); if (sta->gtk_query_cmd_id) l_genl_family_cancel(ap->nl80211, sta->gtk_query_cmd_id); if (sta->sm) eapol_sm_free(sta->sm); if (sta->hs) handshake_state_free(sta->hs); l_free(sta); } static void ap_frame_watch_remove(void *data, void *user_data) { struct netdev *netdev = user_data; if (L_PTR_TO_UINT(data)) netdev_frame_watch_remove(netdev, L_PTR_TO_UINT(data)); } static void ap_reset(struct ap_state *ap) { struct netdev *netdev = ap->netdev; if (!ap->started) return; if (ap->pending) dbus_pending_reply(&ap->pending, dbus_error_aborted(ap->pending)); l_free(ap->ssid); memset(ap->pmk, 0, sizeof(ap->pmk)); l_queue_foreach(ap->frame_watch_ids, ap_frame_watch_remove, netdev); l_queue_destroy(ap->frame_watch_ids, NULL); if (ap->start_stop_cmd_id) l_genl_family_cancel(ap->nl80211, ap->start_stop_cmd_id); l_queue_destroy(ap->sta_states, ap_sta_free); if (ap->rates) l_uintset_free(ap->rates); ap->started = false; l_dbus_property_changed(dbus_get_bus(), netdev_get_path(ap->netdev), IWD_AP_INTERFACE, "Started"); } static void ap_free(void *data) { struct ap_state *ap = data; ap_reset(ap); l_genl_family_free(ap->nl80211); l_free(ap); } static void ap_del_station(struct sta_state *sta, uint16_t reason, bool disassociate) { struct ap_state *ap = sta->ap; netdev_del_station(ap->netdev, sta->addr, reason, disassociate); sta->associated = false; sta->rsna = false; if (sta->gtk_query_cmd_id) { l_genl_family_cancel(ap->nl80211, sta->gtk_query_cmd_id); sta->gtk_query_cmd_id = 0; } if (sta->sm) eapol_sm_free(sta->sm); if (sta->hs) handshake_state_free(sta->hs); sta->hs = NULL; sta->sm = NULL; } static bool ap_sta_match_addr(const void *a, const void *b) { const struct sta_state *sta = a; return !memcmp(sta->addr, b, 6); } static void ap_remove_sta(struct sta_state *sta) { if (!l_queue_remove(sta->ap->sta_states, sta)) { l_error("tried to remove station that doesn't exist"); return; } ap_sta_free(sta); } static void ap_set_sta_cb(struct l_genl_msg *msg, void *user_data) { if (l_genl_msg_get_error(msg) < 0) l_error("SET_STATION failed: %i", l_genl_msg_get_error(msg)); } static void ap_del_key_cb(struct l_genl_msg *msg, void *user_data) { if (l_genl_msg_get_error(msg) < 0) l_debug("DEL_KEY failed: %i", l_genl_msg_get_error(msg)); } static void ap_new_rsna(struct sta_state *sta) { l_debug("STA "MAC" authenticated", MAC_STR(sta->addr)); sta->rsna = true; /* * TODO: Once new AP interface is implemented this is where a * new "ConnectedPeer" property will be added. */ } static void ap_drop_rsna(struct sta_state *sta) { struct ap_state *ap = sta->ap; struct l_genl_msg *msg; uint32_t ifindex = netdev_get_ifindex(sta->ap->netdev); uint8_t key_id = 0; sta->rsna = false; msg = nl80211_build_set_station_unauthorized(ifindex, sta->addr); l_genl_msg_append_attr(msg, NL80211_ATTR_STA_AID, 2, &sta->aid); if (!l_genl_family_send(ap->nl80211, msg, ap_set_sta_cb, NULL, NULL)) { l_genl_msg_unref(msg); l_error("Issuing SET_STATION failed"); } msg = l_genl_msg_new_sized(NL80211_CMD_DEL_KEY, 64); l_genl_msg_append_attr(msg, NL80211_ATTR_IFINDEX, 4, &ifindex); l_genl_msg_append_attr(msg, NL80211_ATTR_KEY_IDX, 1, &key_id); l_genl_msg_append_attr(msg, NL80211_ATTR_MAC, 6, sta->addr); if (!l_genl_family_send(ap->nl80211, msg, ap_del_key_cb, NULL, NULL)) { l_genl_msg_unref(msg); l_error("Issuing DEL_KEY failed"); } if (sta->sm) eapol_sm_free(sta->sm); if (sta->hs) handshake_state_free(sta->hs); sta->hs = NULL; sta->sm = NULL; } static void ap_set_rsn_info(struct ap_state *ap, struct ie_rsn_info *rsn) { memset(rsn, 0, sizeof(*rsn)); rsn->akm_suites = IE_RSN_AKM_SUITE_PSK; rsn->pairwise_ciphers = ap->ciphers; rsn->group_cipher = ap->group_cipher; } /* * Build a Beacon frame or a Probe Response frame's header and body until * the TIM IE. Except for the optional TIM IE which is inserted by the * kernel when needed, our contents for both frames are the same. * See Beacon format in 8.3.3.2 and Probe Response format in 8.3.3.10. */ static size_t ap_build_beacon_pr_head(struct ap_state *ap, enum mpdu_management_subtype stype, const uint8_t *dest, uint8_t *out_buf, size_t out_len) { struct mmpdu_header *mpdu = (void *) out_buf; unsigned int len; uint16_t capability = IE_BSS_CAP_ESS | IE_BSS_CAP_PRIVACY; const uint8_t *bssid = netdev_get_address(ap->netdev); uint32_t minr, maxr, count, r; uint8_t *rates; struct ie_tlv_builder builder; memset(mpdu, 0, 36); /* Zero out header + non-IE fields */ /* Header */ mpdu->fc.protocol_version = 0; mpdu->fc.type = MPDU_TYPE_MANAGEMENT; mpdu->fc.subtype = stype; memcpy(mpdu->address_1, dest, 6); /* DA */ memcpy(mpdu->address_2, bssid, 6); /* SA */ memcpy(mpdu->address_3, bssid, 6); /* BSSID */ /* Body non-IE fields */ l_put_le16(ap->beacon_interval, out_buf + 32); /* Beacon Interval */ l_put_le16(capability, out_buf + 34); /* Capability Info */ ie_tlv_builder_init(&builder, out_buf + 36, out_len - 36); /* SSID IE */ ie_tlv_builder_next(&builder, IE_TYPE_SSID); ie_tlv_builder_set_data(&builder, ap->ssid, strlen(ap->ssid)); /* Supported Rates IE */ ie_tlv_builder_next(&builder, IE_TYPE_SUPPORTED_RATES); rates = ie_tlv_builder_get_data(&builder); minr = l_uintset_find_min(ap->rates); maxr = l_uintset_find_max(ap->rates); count = 0; for (r = minr; r <= maxr && count < 8; r++) if (l_uintset_contains(ap->rates, r)) { uint8_t flag = 0; /* Mark only the lowest rate as Basic Rate */ if (count == 0) flag = 0x80; *rates++ = r | flag; } ie_tlv_builder_set_length(&builder, rates - ie_tlv_builder_get_data(&builder)); /* DSSS Parameter Set IE for DSSS, HR, ERP and HT PHY rates */ ie_tlv_builder_next(&builder, IE_TYPE_DSSS_PARAMETER_SET); ie_tlv_builder_set_data(&builder, &ap->channel, 1); ie_tlv_builder_finalize(&builder, &len); return 36 + len; } /* Beacon / Probe Response frame portion after the TIM IE */ static size_t ap_build_beacon_pr_tail(struct ap_state *ap, uint8_t *out_buf) { size_t len; struct ie_rsn_info rsn; /* TODO: Country IE between TIM IE and RSNE */ /* RSNE */ ap_set_rsn_info(ap, &rsn); if (!ie_build_rsne(&rsn, out_buf)) return 0; len = 2 + out_buf[1]; return len; } static uint32_t ap_send_mgmt_frame(struct ap_state *ap, const struct mmpdu_header *frame, size_t frame_len, bool wait_ack, l_genl_msg_func_t callback, void *user_data) { struct l_genl_msg *msg; uint32_t ifindex = netdev_get_ifindex(ap->netdev); uint32_t id; uint32_t ch_freq = scan_channel_to_freq(ap->channel, SCAN_BAND_2_4_GHZ); msg = l_genl_msg_new_sized(NL80211_CMD_FRAME, 128 + frame_len); l_genl_msg_append_attr(msg, NL80211_ATTR_IFINDEX, 4, &ifindex); l_genl_msg_append_attr(msg, NL80211_ATTR_WIPHY_FREQ, 4, &ch_freq); l_genl_msg_append_attr(msg, NL80211_ATTR_FRAME, frame_len, frame); if (!wait_ack) l_genl_msg_append_attr(msg, NL80211_ATTR_DONT_WAIT_FOR_ACK, 0, NULL); id = l_genl_family_send(ap->nl80211, msg, callback, user_data, NULL); if (!id) l_genl_msg_unref(msg); return id; } static void ap_handshake_event(struct handshake_state *hs, enum handshake_event event, void *event_data, void *user_data) { struct sta_state *sta = user_data; switch (event) { case HANDSHAKE_EVENT_COMPLETE: ap_new_rsna(sta); break; case HANDSHAKE_EVENT_FAILED: netdev_handshake_failed(hs, l_get_u16(event_data)); /* fall through */ case HANDSHAKE_EVENT_SETTING_KEYS_FAILED: sta->sm = NULL; ap_remove_sta(sta); default: break; } } static void ap_start_rsna(struct sta_state *sta, const uint8_t *gtk_rsc) { struct ap_state *ap = sta->ap; struct netdev *netdev = sta->ap->netdev; const uint8_t *own_addr = netdev_get_address(netdev); struct scan_bss bss; struct ie_rsn_info rsn; uint8_t bss_rsne[24]; memset(&bss, 0, sizeof(bss)); ap_set_rsn_info(ap, &rsn); /* * TODO: This assumes the length that ap_set_rsn_info() requires. If * ap_set_rsn_info() changes then this will need to be updated. */ ie_build_rsne(&rsn, bss_rsne); /* this handshake setup assumes PSK network */ sta->hs = netdev_handshake_state_new(netdev); handshake_state_set_event_func(sta->hs, ap_handshake_event, sta); handshake_state_set_ssid(sta->hs, (void *)ap->ssid, strlen(ap->ssid)); handshake_state_set_authenticator(sta->hs, true); handshake_state_set_authenticator_ie(sta->hs, bss_rsne); handshake_state_set_supplicant_ie(sta->hs, sta->assoc_rsne); handshake_state_set_pmk(sta->hs, ap->pmk, 32); handshake_state_set_authenticator_address(sta->hs, own_addr); handshake_state_set_supplicant_address(sta->hs, sta->addr); if (gtk_rsc) handshake_state_set_gtk(sta->hs, ap->gtk, ap->gtk_index, gtk_rsc); sta->sm = eapol_sm_new(sta->hs); if (!sta->sm) { handshake_state_free(sta->hs); sta->hs = NULL; l_error("could not create sm object"); goto error; } eapol_sm_set_listen_interval(sta->sm, sta->listen_interval); eapol_register(sta->sm); return; error: ap_del_station(sta, MMPDU_REASON_CODE_UNSPECIFIED, true); } static void ap_gtk_query_cb(struct l_genl_msg *msg, void *user_data) { struct sta_state *sta = user_data; const void *gtk_rsc; sta->gtk_query_cmd_id = 0; gtk_rsc = nl80211_parse_get_key_seq(msg); if (!gtk_rsc) goto error; ap_start_rsna(sta, gtk_rsc); return; error: ap_del_station(sta, MMPDU_REASON_CODE_UNSPECIFIED, true); } static struct l_genl_msg *ap_build_cmd_del_key(struct ap_state *ap) { uint32_t ifindex = netdev_get_ifindex(ap->netdev); struct l_genl_msg *msg; msg = l_genl_msg_new_sized(NL80211_CMD_DEL_KEY, 128); l_genl_msg_append_attr(msg, NL80211_ATTR_IFINDEX, 4, &ifindex); l_genl_msg_enter_nested(msg, NL80211_ATTR_KEY); l_genl_msg_append_attr(msg, NL80211_KEY_IDX, 1, &ap->gtk_index); l_genl_msg_leave_nested(msg); return msg; } static struct l_genl_msg *ap_build_cmd_new_station(struct sta_state *sta) { struct l_genl_msg *msg; uint32_t ifindex = netdev_get_ifindex(sta->ap->netdev); /* * This should hopefully work both with and without * NL80211_FEATURE_FULL_AP_CLIENT_STATE. */ struct nl80211_sta_flag_update flags = { .mask = (1 << NL80211_STA_FLAG_AUTHENTICATED) | (1 << NL80211_STA_FLAG_ASSOCIATED) | (1 << NL80211_STA_FLAG_AUTHORIZED) | (1 << NL80211_STA_FLAG_MFP), .set = (1 << NL80211_STA_FLAG_AUTHENTICATED) | (1 << NL80211_STA_FLAG_ASSOCIATED), }; msg = l_genl_msg_new_sized(NL80211_CMD_NEW_STATION, 300); l_genl_msg_append_attr(msg, NL80211_ATTR_IFINDEX, 4, &ifindex); l_genl_msg_append_attr(msg, NL80211_ATTR_MAC, 6, sta->addr); l_genl_msg_append_attr(msg, NL80211_ATTR_STA_FLAGS2, 8, &flags); return msg; } static void ap_gtk_op_cb(struct l_genl_msg *msg, void *user_data) { if (l_genl_msg_get_error(msg) < 0) { uint8_t cmd = l_genl_msg_get_command(msg); const char *cmd_name = cmd == NL80211_CMD_NEW_KEY ? "NEW_KEY" : cmd == NL80211_CMD_SET_KEY ? "SET_KEY" : "DEL_KEY"; l_error("%s failed for the GTK: %i", cmd_name, l_genl_msg_get_error(msg)); } } static void ap_associate_sta_cb(struct l_genl_msg *msg, void *user_data) { struct sta_state *sta = user_data; struct ap_state *ap = sta->ap; if (l_genl_msg_get_error(msg) < 0) { l_error("NEW_STATION/SET_STATION failed: %i", l_genl_msg_get_error(msg)); return; } /* * Set up the group key. If this is our first STA then we have * to add the new GTK to the kernel. In theory we should be * able to supply our own RSC (e.g. generated randomly) and use it * immediately for our 4-Way Handshake without querying the kernel. * However NL80211_CMD_NEW_KEY only lets us set the receive RSC -- * the Rx PN for CCMP and the Rx IV for TKIP -- and the * transmit RSC always starts as all zeros. There's effectively * no way to set the Tx RSC or query the Rx RSC through nl80211. * So we query the Tx RSC in both scenarios just in case some * driver/hardware uses a different initial Tx RSC. * * Optimally we would get called back by the EAPoL state machine * only when building the step 3 of 4 message to query the RSC as * late as possible but that would complicate EAPoL. */ if (ap->group_cipher != IE_RSN_CIPHER_SUITE_NO_GROUP_TRAFFIC && !ap->gtk_set) { enum crypto_cipher group_cipher = ie_rsn_cipher_suite_to_cipher(ap->group_cipher); int gtk_len = crypto_cipher_key_len(group_cipher); /* * Generate our GTK. Not following the example derivation * method in 802.11-2016 section 12.7.1.4 because a simple * l_getrandom is just as good. */ l_getrandom(ap->gtk, gtk_len); ap->gtk_index = 1; msg = nl80211_build_new_key_group( netdev_get_ifindex(ap->netdev), group_cipher, ap->gtk_index, ap->gtk, gtk_len, NULL, 0, NULL); if (!l_genl_family_send(ap->nl80211, msg, ap_gtk_op_cb, NULL, NULL)) { l_genl_msg_unref(msg); l_error("Issuing NEW_KEY failed"); goto error; } msg = nl80211_build_set_key(netdev_get_ifindex(ap->netdev), ap->gtk_index); if (!l_genl_family_send(ap->nl80211, msg, ap_gtk_op_cb, NULL, NULL)) { l_genl_msg_unref(msg); l_error("Issuing SET_KEY failed"); goto error; } /* * Set the flag now because any new associating STA will * just use NL80211_CMD_GET_KEY from now. */ ap->gtk_set = true; } if (ap->group_cipher == IE_RSN_CIPHER_SUITE_NO_GROUP_TRAFFIC) ap_start_rsna(sta, NULL); else { msg = nl80211_build_get_key(netdev_get_ifindex(ap->netdev), ap->gtk_index); sta->gtk_query_cmd_id = l_genl_family_send(ap->nl80211, msg, ap_gtk_query_cb, sta, NULL); if (!sta->gtk_query_cmd_id) { l_genl_msg_unref(msg); l_error("Issuing GET_KEY failed"); goto error; } } return; error: ap_del_station(sta, MMPDU_REASON_CODE_UNSPECIFIED, true); } static void ap_associate_sta(struct ap_state *ap, struct sta_state *sta) { struct l_genl_msg *msg; uint32_t ifindex = netdev_get_ifindex(ap->netdev); uint8_t rates[256]; uint32_t r, minr, maxr, count = 0; uint16_t capability = l_get_le16(&sta->capability); if (sta->associated) msg = nl80211_build_set_station_associated(ifindex, sta->addr); else msg = ap_build_cmd_new_station(sta); sta->associated = true; sta->rsna = false; minr = l_uintset_find_min(sta->rates); maxr = l_uintset_find_max(sta->rates); for (r = minr; r <= maxr; r++) if (l_uintset_contains(sta->rates, r)) rates[count++] = r; l_genl_msg_append_attr(msg, NL80211_ATTR_STA_AID, 2, &sta->aid); l_genl_msg_append_attr(msg, NL80211_ATTR_STA_SUPPORTED_RATES, count, &rates); l_genl_msg_append_attr(msg, NL80211_ATTR_STA_LISTEN_INTERVAL, 2, &sta->listen_interval); l_genl_msg_append_attr(msg, NL80211_ATTR_STA_CAPABILITY, 2, &capability); if (!l_genl_family_send(ap->nl80211, msg, ap_associate_sta_cb, sta, NULL)) { l_genl_msg_unref(msg); if (l_genl_msg_get_command(msg) == NL80211_CMD_NEW_STATION) l_error("Issuing NEW_STATION failed"); else l_error("Issuing SET_STATION failed"); } } static bool ap_common_rates(struct l_uintset *ap_rates, struct l_uintset *sta_rates) { uint32_t minr = l_uintset_find_min(ap_rates); /* Our lowest rate is a Basic Rate so must be supported */ if (l_uintset_contains(sta_rates, minr)) return true; return false; } static void ap_success_assoc_resp_cb(struct l_genl_msg *msg, void *user_data) { struct sta_state *sta = user_data; struct ap_state *ap = sta->ap; sta->assoc_resp_cmd_id = 0; if (l_genl_msg_get_error(msg) < 0) { l_error("AP (Re)Association Response not sent or not ACKed: %i", l_genl_msg_get_error(msg)); /* If we were in State 3 or 4 go to back to State 2 */ if (sta->associated) ap_del_station(sta, MMPDU_REASON_CODE_UNSPECIFIED, true); return; } /* If we were in State 2, 3 or 4 also go to State 3 */ ap_associate_sta(ap, sta); l_info("AP (Re)Association Response ACK received"); } static void ap_fail_assoc_resp_cb(struct l_genl_msg *msg, void *user_data) { if (l_genl_msg_get_error(msg) < 0) l_error("AP (Re)Association Response with an error status not " "sent or not ACKed: %i", l_genl_msg_get_error(msg)); else l_info("AP (Re)Association Response with an error status " "delivered OK"); } static uint32_t ap_assoc_resp(struct ap_state *ap, struct sta_state *sta, const uint8_t *dest, uint16_t aid, enum mmpdu_reason_code status_code, bool reassoc, l_genl_msg_func_t callback) { const uint8_t *addr = netdev_get_address(ap->netdev); uint8_t mpdu_buf[128]; struct mmpdu_header *mpdu = (void *) mpdu_buf; struct mmpdu_association_response *resp; size_t ies_len = 0; uint16_t capability = IE_BSS_CAP_ESS | IE_BSS_CAP_PRIVACY; uint32_t r, minr, maxr, count; memset(mpdu, 0, sizeof(*mpdu)); /* Header */ mpdu->fc.protocol_version = 0; mpdu->fc.type = MPDU_TYPE_MANAGEMENT; mpdu->fc.subtype = reassoc ? MPDU_MANAGEMENT_SUBTYPE_REASSOCIATION_RESPONSE : MPDU_MANAGEMENT_SUBTYPE_ASSOCIATION_RESPONSE; memcpy(mpdu->address_1, dest, 6); /* DA */ memcpy(mpdu->address_2, addr, 6); /* SA */ memcpy(mpdu->address_3, addr, 6); /* BSSID */ /* Association Response body */ resp = (void *) mmpdu_body(mpdu); l_put_le16(capability, &resp->capability); resp->status_code = L_CPU_TO_LE16(status_code); resp->aid = L_CPU_TO_LE16(aid | 0xc000); /* Supported Rates IE */ resp->ies[ies_len++] = IE_TYPE_SUPPORTED_RATES; minr = l_uintset_find_min(ap->rates); maxr = l_uintset_find_max(ap->rates); count = 0; for (r = minr; r <= maxr && count < 8; r++) if (l_uintset_contains(ap->rates, r)) { uint8_t flag = 0; /* Mark only the lowest rate as Basic Rate */ if (count == 0) flag = 0x80; resp->ies[ies_len + 1 + count++] = r | flag; } resp->ies[ies_len++] = count; ies_len += count; return ap_send_mgmt_frame(ap, mpdu, resp->ies + ies_len - mpdu_buf, true, callback, sta); } static int ap_parse_supported_rates(struct ie_tlv_iter *iter, struct l_uintset **set) { const uint8_t *rates; unsigned int len; unsigned int i; len = ie_tlv_iter_get_length(iter); if (ie_tlv_iter_get_tag(iter) == IE_TYPE_SUPPORTED_RATES && len == 0) return -EINVAL; rates = ie_tlv_iter_get_data(iter); if (!*set) *set = l_uintset_new(108); for (i = 0; i < len; i++) { if (rates[i] == 0xff) continue; l_uintset_put(*set, rates[i] & 0x7f); } return 0; } /* * This handles both the Association and Reassociation Request frames. * Association Request is documented in 802.11-2016 9.3.3.6 (frame format), * 802.11-2016 11.3.5.3 (MLME/SME) and Reassociation in 802.11-2016 * 9.3.3.8 (frame format), 802.11-2016 11.3.5.3 (MLME/SME). * * The difference between Association and Reassociation procedures is * documented in 11.3.5.1 "General" but seems inconsistent with specific * instructions in 11.3.5.3 vs. 11.3.5.5 and 11.3.5.2 vs. 11.3.5.4. * According to 11.3.5.1: * 1. Reassociation requires the STA to be already associated in the ESS, * Association doesn't. * 2. Unsuccessful Reassociation should not cause a state transition of * the authentication state between the two STAs. * * The first requirement is not present in 11.3.5.5 which is virtually * identical with 11.3.5.3, but we do implement it. Number 2 is also not * reflected in 11.3.5.5 where the state transitions are the same as in * 11.3.5.3 and 11.3.5.4 where the state transitions are the same as in * 11.3.5.2 including f) "If a Reassociation Response frame is received * with a status code other than SUCCESS [...] 1. [...] the state for * the AP [...] shall be set to State 2 [...]" * * For the record here are the apparent differences between 802.11-2016 * 11.3.5.2 and 11.3.5.4 ignoring the s/Associate/Reassociate/ changes * and the special case of Reassociation during a Fast Transition. * o Points c) and d) are switched around. * o On success, the STA is disassociated from all other APs in 11.3.5.2, * and from the previous AP in 11.3.5.4 c). (Shouldn't make a * difference as there seems to be no way for the STA to become * associated with more than one AP) * o After Association a 4-Way Handshake is always performed, after * Reassociation it is only performed if STA was in State 3 according * to 11.3.5.4 g). This is not reflected in 11.3.5.5 though. * Additionally 11.3.5.4 and 11.3.5.5 require the STA and AP * respectively to delete current PTKSA/GTKSA/IGTKSA at the beginning * of the procedure independent of the STA state so without a 4-Way * Handshake the two stations end up with no encryption keys. * * The main difference between 11.3.5.3 and 11.3.5.5 is presence of p). */ static void ap_assoc_reassoc(struct sta_state *sta, bool reassoc, const struct mmpdu_field_capability *capability, uint16_t listen_interval, struct ie_tlv_iter *ies) { struct ap_state *ap = sta->ap; const char *ssid = NULL; const uint8_t *rsn = NULL; size_t ssid_len = 0; struct l_uintset *rates = NULL; struct ie_rsn_info rsn_info; int err; if (sta->assoc_resp_cmd_id) return; if (reassoc && !sta->associated) { err = MMPDU_REASON_CODE_CLASS3_FRAME_FROM_NONASSOC_STA; goto unsupported; } while (ie_tlv_iter_next(ies)) switch (ie_tlv_iter_get_tag(ies)) { case IE_TYPE_SSID: ssid = (const char *) ie_tlv_iter_get_data(ies); ssid_len = ie_tlv_iter_get_length(ies); break; case IE_TYPE_SUPPORTED_RATES: case IE_TYPE_EXTENDED_SUPPORTED_RATES: if (ap_parse_supported_rates(ies, &rates) < 0) { err = MMPDU_REASON_CODE_INVALID_IE; goto bad_frame; } break; case IE_TYPE_RSN: if (ie_parse_rsne(ies, &rsn_info) < 0) { err = MMPDU_REASON_CODE_INVALID_IE; goto bad_frame; } rsn = (const uint8_t *) ie_tlv_iter_get_data(ies) - 2; break; } if (!rates || !ssid || !rsn || ssid_len != strlen(ap->ssid) || memcmp(ssid, ap->ssid, ssid_len)) { err = MMPDU_REASON_CODE_INVALID_IE; goto bad_frame; } if (!ap_common_rates(ap->rates, rates)) { err = MMPDU_REASON_CODE_UNSPECIFIED; goto unsupported; } if (rsn_info.mfpr && rsn_info.spp_a_msdu_required) { err = MMPDU_REASON_CODE_UNSPECIFIED; goto unsupported; } if (!(rsn_info.pairwise_ciphers & ap->ciphers)) { err = MMPDU_REASON_CODE_INVALID_PAIRWISE_CIPHER; goto unsupported; } if (rsn_info.akm_suites != IE_RSN_AKM_SUITE_PSK) { err = MMPDU_REASON_CODE_INVALID_AKMP; goto unsupported; } if (!sta->associated) { /* * Everything fine so far, assign an AID, send response. * According to 802.11-2016 11.3.5.3 l) we will only go to * State 3 (set sta->associated) once we receive the station's * ACK or gave up on resends. */ sta->aid = ++ap->last_aid; } sta->capability = *capability; sta->listen_interval = listen_interval; if (sta->rates) l_uintset_free(sta->rates); sta->rates = rates; if (sta->assoc_rsne) l_free(sta->assoc_rsne); sta->assoc_rsne = l_memdup(rsn, rsn[1] + 2); /* 802.11-2016 11.3.5.3 j) */ if (sta->rsna) ap_drop_rsna(sta); sta->assoc_resp_cmd_id = ap_assoc_resp(ap, sta, sta->addr, sta->aid, 0, reassoc, ap_success_assoc_resp_cb); if (!sta->assoc_resp_cmd_id) l_error("Sending success (Re)Association Response failed"); return; unsupported: bad_frame: /* * TODO: MFP * * 802.11-2016 11.3.5.3 m) * "If the ResultCode in the MLME-ASSOCIATE.response primitive is * not SUCCESS and management frame protection is in use the state * for the STA shall be left unchanged. If the ResultCode is not * SUCCESS and management frame protection is not in use the state * for the STA shall be set to State 3 if it was State 4." * * For now, we need to drop the RSNA. */ if (sta->associated && sta->rsna) ap_drop_rsna(sta); if (rates) l_uintset_free(rates); if (!ap_assoc_resp(ap, NULL, sta->addr, 0, err, reassoc, ap_fail_assoc_resp_cb)) l_error("Sending error (Re)Association Response failed"); } /* 802.11-2016 9.3.3.6 */ static void ap_assoc_req_cb(struct netdev *netdev, const struct mmpdu_header *hdr, const void *body, size_t body_len, void *user_data) { struct ap_state *ap = user_data; struct sta_state *sta; const uint8_t *from = hdr->address_2; const struct mmpdu_association_request *req = body; const uint8_t *bssid = netdev_get_address(ap->netdev); struct ie_tlv_iter iter; l_info("AP Association Request from %s", util_address_to_string(from)); if (memcmp(hdr->address_1, bssid, 6) || memcmp(hdr->address_3, bssid, 6)) return; sta = l_queue_find(ap->sta_states, ap_sta_match_addr, from); if (!sta) { if (!ap_assoc_resp(ap, NULL, from, 0, MMPDU_REASON_CODE_STA_REQ_ASSOC_WITHOUT_AUTH, false, ap_fail_assoc_resp_cb)) l_error("Sending error Association Response failed"); return; } ie_tlv_iter_init(&iter, req->ies, body_len - sizeof(*req)); ap_assoc_reassoc(sta, false, &req->capability, L_LE16_TO_CPU(req->listen_interval), &iter); } /* 802.11-2016 9.3.3.8 */ static void ap_reassoc_req_cb(struct netdev *netdev, const struct mmpdu_header *hdr, const void *body, size_t body_len, void *user_data) { struct ap_state *ap = user_data; struct sta_state *sta; const uint8_t *from = hdr->address_2; const struct mmpdu_reassociation_request *req = body; const uint8_t *bssid = netdev_get_address(ap->netdev); struct ie_tlv_iter iter; int err; l_info("AP Reassociation Request from %s", util_address_to_string(from)); if (memcmp(hdr->address_1, bssid, 6) || memcmp(hdr->address_3, bssid, 6)) return; sta = l_queue_find(ap->sta_states, ap_sta_match_addr, from); if (!sta) { err = MMPDU_REASON_CODE_STA_REQ_ASSOC_WITHOUT_AUTH; goto bad_frame; } if (memcmp(req->current_ap_address, bssid, 6)) { err = MMPDU_REASON_CODE_UNSPECIFIED; goto bad_frame; } ie_tlv_iter_init(&iter, req->ies, body_len - sizeof(*req)); ap_assoc_reassoc(sta, true, &req->capability, L_LE16_TO_CPU(req->listen_interval), &iter); return; bad_frame: if (!ap_assoc_resp(ap, NULL, from, 0, err, true, ap_fail_assoc_resp_cb)) l_error("Sending error Reassociation Response failed"); } static void ap_probe_resp_cb(struct l_genl_msg *msg, void *user_data) { if (l_genl_msg_get_error(msg) < 0) l_error("AP Probe Response not sent: %i", l_genl_msg_get_error(msg)); else l_info("AP Probe Response sent OK"); } /* * Parse Probe Request according to 802.11-2016 9.3.3.10 and act according * to 802.11-2016 11.1.4.3 */ static void ap_probe_req_cb(struct netdev *netdev, const struct mmpdu_header *hdr, const void *body, size_t body_len, void *user_data) { struct ap_state *ap = user_data; const struct mmpdu_probe_request *req = body; const char *ssid = NULL; const uint8_t *ssid_list = NULL; size_t ssid_len = 0, ssid_list_len = 0, len; uint8_t dsss_channel = 0; struct ie_tlv_iter iter; const uint8_t *bssid = netdev_get_address(ap->netdev); bool match = false; uint8_t resp[512]; l_info("AP Probe Request from %s", util_address_to_string(hdr->address_2)); ie_tlv_iter_init(&iter, req->ies, body_len - sizeof(*req)); while (ie_tlv_iter_next(&iter)) switch (ie_tlv_iter_get_tag(&iter)) { case IE_TYPE_SSID: ssid = (const char *) ie_tlv_iter_get_data(&iter); ssid_len = ie_tlv_iter_get_length(&iter); break; case IE_TYPE_SSID_LIST: ssid_list = ie_tlv_iter_get_data(&iter); ssid_list_len = ie_tlv_iter_get_length(&iter); break; case IE_TYPE_DSSS_PARAMETER_SET: if (ie_tlv_iter_get_length(&iter) != 1) return; dsss_channel = ie_tlv_iter_get_data(&iter)[0]; break; } /* * Check if we should reply to this Probe Request according to * 802.11-2016 section 11.1.4.3.2. */ if (memcmp(hdr->address_1, bssid, 6) && !util_is_broadcast_address(hdr->address_1)) match = false; if (memcmp(hdr->address_3, bssid, 6) && !util_is_broadcast_address(hdr->address_3)) match = false; if (!ssid || ssid_len == 0) /* Wildcard SSID */ match = true; else if (ssid && ssid_len == strlen(ap->ssid) && /* Specific SSID */ !memcmp(ssid, ap->ssid, ssid_len)) match = true; else if (ssid_list) { /* SSID List */ ie_tlv_iter_init(&iter, ssid_list, ssid_list_len); while (ie_tlv_iter_next(&iter)) { if (ie_tlv_iter_get_tag(&iter) != IE_TYPE_SSID) return; ssid = (const char *) ie_tlv_iter_get_data(&iter); ssid_len = ie_tlv_iter_get_length(&iter); if (ssid_len == strlen(ap->ssid) && !memcmp(ssid, ap->ssid, ssid_len)) { match = true; break; } } } if (dsss_channel != 0 && dsss_channel != ap->channel) match = false; if (!match) return; len = ap_build_beacon_pr_head(ap, MPDU_MANAGEMENT_SUBTYPE_PROBE_RESPONSE, hdr->address_2, resp, sizeof(resp)); len += ap_build_beacon_pr_tail(ap, resp + len); ap_send_mgmt_frame(ap, (struct mmpdu_header *) resp, len, false, ap_probe_resp_cb, NULL); } /* 802.11-2016 9.3.3.5 (frame format), 802.11-2016 11.3.5.9 (MLME/SME) */ static void ap_disassoc_cb(struct netdev *netdev, const struct mmpdu_header *hdr, const void *body, size_t body_len, void *user_data) { struct ap_state *ap = user_data; struct sta_state *sta; const struct mmpdu_disassociation *disassoc = body; const uint8_t *bssid = netdev_get_address(ap->netdev); l_info("AP Disassociation from %s, reason %i", util_address_to_string(hdr->address_2), (int) L_LE16_TO_CPU(disassoc->reason_code)); if (memcmp(hdr->address_1, bssid, 6) || memcmp(hdr->address_3, bssid, 6)) return; sta = l_queue_find(ap->sta_states, ap_sta_match_addr, hdr->address_2); if (sta && sta->assoc_resp_cmd_id) { l_genl_family_cancel(ap->nl80211, sta->assoc_resp_cmd_id); sta->assoc_resp_cmd_id = 0; } if (!sta || !sta->associated) return; ap_del_station(sta, L_LE16_TO_CPU(disassoc->reason_code), true); } static void ap_auth_reply_cb(struct l_genl_msg *msg, void *user_data) { if (l_genl_msg_get_error(msg) < 0) l_error("AP Authentication frame 2 not sent or not ACKed: %i", l_genl_msg_get_error(msg)); else l_info("AP Authentication frame 2 ACKed by STA"); } static void ap_auth_reply(struct ap_state *ap, const uint8_t *dest, enum mmpdu_reason_code status_code) { const uint8_t *addr = netdev_get_address(ap->netdev); uint8_t mpdu_buf[64]; struct mmpdu_header *mpdu = (struct mmpdu_header *) mpdu_buf; struct mmpdu_authentication *auth; memset(mpdu, 0, sizeof(*mpdu)); /* Header */ mpdu->fc.protocol_version = 0; mpdu->fc.type = MPDU_TYPE_MANAGEMENT; mpdu->fc.subtype = MPDU_MANAGEMENT_SUBTYPE_AUTHENTICATION; memcpy(mpdu->address_1, dest, 6); /* DA */ memcpy(mpdu->address_2, addr, 6); /* SA */ memcpy(mpdu->address_3, addr, 6); /* BSSID */ /* Authentication body */ auth = (void *) mmpdu_body(mpdu); auth->algorithm = L_CPU_TO_LE16(MMPDU_AUTH_ALGO_OPEN_SYSTEM); auth->transaction_sequence = L_CPU_TO_LE16(2); auth->status = L_CPU_TO_LE16(status_code); ap_send_mgmt_frame(ap, mpdu, (uint8_t *) auth + 6 - mpdu_buf, true, ap_auth_reply_cb, NULL); } /* * 802.11-2016 9.3.3.12 (frame format), 802.11-2016 11.3.4.3 and * 802.11-2016 12.3.3.2 (MLME/SME) */ static void ap_auth_cb(struct netdev *netdev, const struct mmpdu_header *hdr, const void *body, size_t body_len, void *user_data) { struct ap_state *ap = user_data; const struct mmpdu_authentication *auth = body; const uint8_t *from = hdr->address_2; const uint8_t *bssid = netdev_get_address(ap->netdev); struct sta_state *sta; l_info("AP Authentication from %s", util_address_to_string(from)); if (memcmp(hdr->address_1, bssid, 6) || memcmp(hdr->address_3, bssid, 6)) return; /* Only Open System authentication implemented here */ if (L_LE16_TO_CPU(auth->algorithm) != MMPDU_AUTH_ALGO_OPEN_SYSTEM) { ap_auth_reply(ap, from, MMPDU_REASON_CODE_UNSPECIFIED); return; } if (L_LE16_TO_CPU(auth->transaction_sequence) != 1) { ap_auth_reply(ap, from, MMPDU_REASON_CODE_UNSPECIFIED); return; } sta = l_queue_find(ap->sta_states, ap_sta_match_addr, from); /* * Figure 11-13 in 802.11-2016 11.3.2 shows a transition from * States 3 / 4 to State 2 on "Successful 802.11 Authentication" * however 11.3.4.2 and 11.3.4.3 clearly say the connection goes to * State 2 only if it was in State 1: * * "c) [...] the state for the indicated STA shall be set to State 2 * if it was State 1; the state shall remain unchanged if it was other * than State 1." */ if (sta) goto done; /* * Per 12.3.3.2.3 with Open System the state change is immediate, * no waiting for the response to be ACKed as with the association * frames. */ sta = l_new(struct sta_state, 1); memcpy(sta->addr, from, 6); sta->ap = ap; if (!ap->sta_states) ap->sta_states = l_queue_new(); l_queue_push_tail(ap->sta_states, sta); /* * Nothing to do here netlink-wise as we can't receive any data * frames until after association anyway. We do need to add a * timeout for the authentication and possibly the kernel could * handle that if we registered the STA with NEW_STATION now (TODO) */ done: ap_auth_reply(ap, from, 0); } /* 802.11-2016 9.3.3.13 (frame format), 802.11-2016 11.3.4.5 (MLME/SME) */ static void ap_deauth_cb(struct netdev *netdev, const struct mmpdu_header *hdr, const void *body, size_t body_len, void *user_data) { struct ap_state *ap = user_data; struct sta_state *sta; const struct mmpdu_deauthentication *deauth = body; const uint8_t *bssid = netdev_get_address(ap->netdev); l_info("AP Deauthentication from %s, reason %i", util_address_to_string(hdr->address_2), (int) L_LE16_TO_CPU(deauth->reason_code)); if (memcmp(hdr->address_1, bssid, 6) || memcmp(hdr->address_3, bssid, 6)) return; sta = l_queue_remove_if(ap->sta_states, ap_sta_match_addr, hdr->address_2); if (!sta) return; ap_del_station(sta, L_LE16_TO_CPU(deauth->reason_code), false); ap_sta_free(sta); } static void ap_start_cb(struct l_genl_msg *msg, void *user_data) { struct ap_state *ap = user_data; ap->start_stop_cmd_id = 0; if (!ap->pending) return; if (l_genl_msg_get_error(msg) < 0) { l_error("START_AP failed: %i", l_genl_msg_get_error(msg)); dbus_pending_reply(&ap->pending, dbus_error_invalid_args(ap->pending)); ap_reset(ap); return; } dbus_pending_reply(&ap->pending, l_dbus_message_new_method_return(ap->pending)); ap->started = true; l_dbus_property_changed(dbus_get_bus(), netdev_get_path(ap->netdev), IWD_AP_INTERFACE, "Started"); } static struct l_genl_msg *ap_build_cmd_start_ap(struct ap_state *ap) { struct l_genl_msg *cmd; uint8_t head[256], tail[256]; size_t head_len, tail_len; uint32_t dtim_period = 3; uint32_t ifindex = netdev_get_ifindex(ap->netdev); struct wiphy *wiphy = netdev_get_wiphy(ap->netdev); uint32_t hidden_ssid = NL80211_HIDDEN_SSID_NOT_IN_USE; uint32_t nl_ciphers = ie_rsn_cipher_suite_to_cipher(ap->ciphers); uint32_t nl_akm = CRYPTO_AKM_PSK; uint32_t wpa_version = NL80211_WPA_VERSION_2; uint32_t auth_type = NL80211_AUTHTYPE_OPEN_SYSTEM; uint32_t ch_freq = scan_channel_to_freq(ap->channel, SCAN_BAND_2_4_GHZ); uint32_t ch_width = NL80211_CHAN_WIDTH_20; static const uint8_t bcast_addr[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; head_len = ap_build_beacon_pr_head(ap, MPDU_MANAGEMENT_SUBTYPE_BEACON, bcast_addr, head, sizeof(head)); tail_len = ap_build_beacon_pr_tail(ap, tail); if (!head_len || !tail_len) return NULL; cmd = l_genl_msg_new_sized(NL80211_CMD_START_AP, 256 + head_len + tail_len + strlen(ap->ssid)); /* SET_BEACON attrs */ l_genl_msg_append_attr(cmd, NL80211_ATTR_BEACON_HEAD, head_len, head); l_genl_msg_append_attr(cmd, NL80211_ATTR_BEACON_TAIL, tail_len, tail); l_genl_msg_append_attr(cmd, NL80211_ATTR_IE, 0, ""); l_genl_msg_append_attr(cmd, NL80211_ATTR_IE_PROBE_RESP, 0, ""); l_genl_msg_append_attr(cmd, NL80211_ATTR_IE_ASSOC_RESP, 0, ""); /* START_AP attrs */ l_genl_msg_append_attr(cmd, NL80211_ATTR_BEACON_INTERVAL, 4, &ap->beacon_interval); l_genl_msg_append_attr(cmd, NL80211_ATTR_DTIM_PERIOD, 4, &dtim_period); l_genl_msg_append_attr(cmd, NL80211_ATTR_IFINDEX, 4, &ifindex); l_genl_msg_append_attr(cmd, NL80211_ATTR_SSID, strlen(ap->ssid), ap->ssid); l_genl_msg_append_attr(cmd, NL80211_ATTR_HIDDEN_SSID, 4, &hidden_ssid); l_genl_msg_append_attr(cmd, NL80211_ATTR_CIPHER_SUITES_PAIRWISE, 4, &nl_ciphers); l_genl_msg_append_attr(cmd, NL80211_ATTR_WPA_VERSIONS, 4, &wpa_version); l_genl_msg_append_attr(cmd, NL80211_ATTR_AKM_SUITES, 4, &nl_akm); l_genl_msg_append_attr(cmd, NL80211_ATTR_AUTH_TYPE, 4, &auth_type); l_genl_msg_append_attr(cmd, NL80211_ATTR_WIPHY_FREQ, 4, &ch_freq); l_genl_msg_append_attr(cmd, NL80211_ATTR_CHANNEL_WIDTH, 4, &ch_width); if (wiphy_has_ext_feature(wiphy, NL80211_EXT_FEATURE_CONTROL_PORT_OVER_NL80211)) { l_genl_msg_append_attr(cmd, NL80211_ATTR_SOCKET_OWNER, 0, NULL); l_genl_msg_append_attr(cmd, NL80211_ATTR_CONTROL_PORT_OVER_NL80211, 0, NULL); } return cmd; } static int ap_start(struct ap_state *ap, const char *ssid, const char *psk, struct l_dbus_message *message) { struct netdev *netdev = ap->netdev; struct wiphy *wiphy = netdev_get_wiphy(netdev); struct l_genl_msg *cmd; const struct l_queue_entry *entry; uint32_t id; ap->ssid = l_strdup(ssid); /* TODO: Start a Get Survey to decide the channel */ ap->channel = 6; /* TODO: Add all ciphers supported by wiphy */ ap->ciphers = wiphy_select_cipher(wiphy, 0xffff); ap->group_cipher = wiphy_select_cipher(wiphy, 0xffff); ap->beacon_interval = 100; /* TODO: Use actual supported rates */ ap->rates = l_uintset_new(200); l_uintset_put(ap->rates, 2); /* 1 Mbps*/ l_uintset_put(ap->rates, 11); /* 5.5 Mbps*/ l_uintset_put(ap->rates, 22); /* 11 Mbps*/ if (crypto_psk_from_passphrase(psk, (uint8_t *) ssid, strlen(ssid), ap->pmk) < 0) goto error; ap->frame_watch_ids = l_queue_new(); id = netdev_frame_watch_add(netdev, 0x0000 | (MPDU_MANAGEMENT_SUBTYPE_ASSOCIATION_REQUEST << 4), NULL, 0, ap_assoc_req_cb, ap); l_queue_push_tail(ap->frame_watch_ids, L_UINT_TO_PTR(id)); id = netdev_frame_watch_add(netdev, 0x0000 | (MPDU_MANAGEMENT_SUBTYPE_REASSOCIATION_REQUEST << 4), NULL, 0, ap_reassoc_req_cb, ap); l_queue_push_tail(ap->frame_watch_ids, L_UINT_TO_PTR(id)); id = netdev_frame_watch_add(netdev, 0x0000 | (MPDU_MANAGEMENT_SUBTYPE_PROBE_REQUEST << 4), NULL, 0, ap_probe_req_cb, ap); l_queue_push_tail(ap->frame_watch_ids, L_UINT_TO_PTR(id)); id = netdev_frame_watch_add(netdev, 0x0000 | (MPDU_MANAGEMENT_SUBTYPE_DISASSOCIATION << 4), NULL, 0, ap_disassoc_cb, ap); l_queue_push_tail(ap->frame_watch_ids, L_UINT_TO_PTR(id)); id = netdev_frame_watch_add(netdev, 0x0000 | (MPDU_MANAGEMENT_SUBTYPE_AUTHENTICATION << 4), NULL, 0, ap_auth_cb, ap); l_queue_push_tail(ap->frame_watch_ids, L_UINT_TO_PTR(id)); id = netdev_frame_watch_add(netdev, 0x0000 | (MPDU_MANAGEMENT_SUBTYPE_DEAUTHENTICATION << 4), NULL, 0, ap_deauth_cb, ap); l_queue_push_tail(ap->frame_watch_ids, L_UINT_TO_PTR(id)); for (entry = l_queue_get_entries(ap->frame_watch_ids); entry; entry = entry->next) if (!L_PTR_TO_UINT(entry->data)) goto error; cmd = ap_build_cmd_start_ap(ap); if (!cmd) goto error; ap->start_stop_cmd_id = l_genl_family_send(ap->nl80211, cmd, ap_start_cb, ap, NULL); if (!ap->start_stop_cmd_id) { l_genl_msg_unref(cmd); goto error; } ap->pending = l_dbus_message_ref(message); return 0; error: ap_reset(ap); return -EIO; } static void ap_stop_cb(struct l_genl_msg *msg, void *user_data) { struct ap_state *ap = user_data; ap->start_stop_cmd_id = 0; if (!ap->pending) goto end; if (l_genl_msg_get_error(msg) < 0) { l_error("STOP_AP failed: %i", l_genl_msg_get_error(msg)); dbus_pending_reply(&ap->pending, dbus_error_failed(ap->pending)); goto end; } dbus_pending_reply(&ap->pending, l_dbus_message_new_method_return(ap->pending)); end: ap_reset(ap); } static struct l_genl_msg *ap_build_cmd_stop_ap(struct ap_state *ap) { struct l_genl_msg *cmd; uint32_t ifindex = netdev_get_ifindex(ap->netdev); cmd = l_genl_msg_new_sized(NL80211_CMD_STOP_AP, 16); l_genl_msg_append_attr(cmd, NL80211_ATTR_IFINDEX, 4, &ifindex); return cmd; } static int ap_stop(struct ap_state *ap, struct l_dbus_message *message) { struct l_genl_msg *cmd; cmd = ap_build_cmd_stop_ap(ap); if (!cmd) return -ENOMEM; if (ap->start_stop_cmd_id) l_genl_family_cancel(ap->nl80211, ap->start_stop_cmd_id); ap->start_stop_cmd_id = l_genl_family_send(ap->nl80211, cmd, ap_stop_cb, ap, NULL); if (!ap->start_stop_cmd_id) { l_genl_msg_unref(cmd); return -EIO; } if (ap->gtk_set) { struct l_genl_msg *msg; ap->gtk_set = false; msg = ap_build_cmd_del_key(ap); if (!l_genl_family_send(ap->nl80211, msg, ap_gtk_op_cb, NULL, NULL)) { l_genl_msg_unref(msg); l_error("Issuing DEL_KEY failed"); } } ap->pending = l_dbus_message_ref(message); return 0; } static struct l_dbus_message *ap_dbus_start(struct l_dbus *dbus, struct l_dbus_message *message, void *user_data) { struct ap_state *ap = user_data; const char *ssid, *wpa2_psk; if (ap->pending) return dbus_error_busy(message); if (ap->started) return dbus_error_already_exists(message); if (!l_dbus_message_get_arguments(message, "ss", &ssid, &wpa2_psk)) return dbus_error_invalid_args(message); if (ap_start(ap, ssid, wpa2_psk, message) < 0) return dbus_error_invalid_args(message); return NULL; } static struct l_dbus_message *ap_dbus_stop(struct l_dbus *dbus, struct l_dbus_message *message, void *user_data) { struct ap_state *ap = user_data; if (ap->pending) return dbus_error_busy(message); /* already stopped, no-op */ if (!ap->started) return l_dbus_message_new_method_return(message); if (ap_stop(ap, message) < 0) return dbus_error_failed(message); return NULL; } static bool ap_dbus_property_get_started(struct l_dbus *dbus, struct l_dbus_message *message, struct l_dbus_message_builder *builder, void *user_data) { struct ap_state *ap = user_data; bool started = ap->started; l_dbus_message_builder_append_basic(builder, 'b', &started); return true; } static void ap_setup_interface(struct l_dbus_interface *interface) { l_dbus_interface_method(interface, "Start", 0, ap_dbus_start, "", "ss", "ssid", "wpa2_psk"); l_dbus_interface_method(interface, "Stop", 0, ap_dbus_stop, "", ""); l_dbus_interface_property(interface, "Started", 0, "b", ap_dbus_property_get_started, NULL); } static void ap_destroy_interface(void *user_data) { struct ap_state *ap = user_data; ap_free(ap); } static void ap_add_interface(struct netdev *netdev) { struct ap_state *ap; /* * TODO: Check wiphy supported channels and NL80211_ATTR_TX_FRAME_TYPES */ /* just allocate/set device, Start method will complete setup */ ap = l_new(struct ap_state, 1); ap->netdev = netdev; ap->nl80211 = l_genl_family_new(iwd_get_genl(), NL80211_GENL_NAME); /* setup ap dbus interface */ l_dbus_object_add_interface(dbus_get_bus(), netdev_get_path(netdev), IWD_AP_INTERFACE, ap); } static void ap_remove_interface(struct netdev *netdev) { l_dbus_object_remove_interface(dbus_get_bus(), netdev_get_path(netdev), IWD_AP_INTERFACE); } static void ap_netdev_watch(struct netdev *netdev, enum netdev_watch_event event, void *userdata) { switch (event) { case NETDEV_WATCH_EVENT_UP: case NETDEV_WATCH_EVENT_NEW: if (netdev_get_iftype(netdev) == NETDEV_IFTYPE_AP && netdev_get_is_up(netdev)) ap_add_interface(netdev); break; case NETDEV_WATCH_EVENT_DOWN: case NETDEV_WATCH_EVENT_DEL: ap_remove_interface(netdev); break; default: break; } } static int ap_init(void) { netdev_watch = netdev_watch_add(ap_netdev_watch, NULL, NULL); l_dbus_register_interface(dbus_get_bus(), IWD_AP_INTERFACE, ap_setup_interface, ap_destroy_interface, false); return 0; } static void ap_exit(void) { netdev_watch_remove(netdev_watch); l_dbus_unregister_interface(dbus_get_bus(), IWD_AP_INTERFACE); } IWD_MODULE(ap, ap_init, ap_exit)