| // SPDX-License-Identifier: GPL-2.0-only |
| /* |
| * mac80211 TDLS handling code |
| * |
| * Copyright 2006-2010 Johannes Berg <johannes@sipsolutions.net> |
| * Copyright 2014, Intel Corporation |
| * Copyright 2014 Intel Mobile Communications GmbH |
| * Copyright 2015 - 2016 Intel Deutschland GmbH |
| * Copyright (C) 2019 Intel Corporation |
| */ |
| |
| #include <linux/ieee80211.h> |
| #include <linux/log2.h> |
| #include <net/cfg80211.h> |
| #include <linux/rtnetlink.h> |
| #include "ieee80211_i.h" |
| #include "driver-ops.h" |
| #include "rate.h" |
| #include "wme.h" |
| |
| /* give usermode some time for retries in setting up the TDLS session */ |
| #define TDLS_PEER_SETUP_TIMEOUT (15 * HZ) |
| |
| void ieee80211_tdls_peer_del_work(struct work_struct *wk) |
| { |
| struct ieee80211_sub_if_data *sdata; |
| struct ieee80211_local *local; |
| |
| sdata = container_of(wk, struct ieee80211_sub_if_data, |
| u.mgd.tdls_peer_del_work.work); |
| local = sdata->local; |
| |
| mutex_lock(&local->mtx); |
| if (!is_zero_ether_addr(sdata->u.mgd.tdls_peer)) { |
| tdls_dbg(sdata, "TDLS del peer %pM\n", sdata->u.mgd.tdls_peer); |
| sta_info_destroy_addr(sdata, sdata->u.mgd.tdls_peer); |
| eth_zero_addr(sdata->u.mgd.tdls_peer); |
| } |
| mutex_unlock(&local->mtx); |
| } |
| |
| static void ieee80211_tdls_add_ext_capab(struct ieee80211_sub_if_data *sdata, |
| struct sk_buff *skb) |
| { |
| struct ieee80211_local *local = sdata->local; |
| struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; |
| bool chan_switch = local->hw.wiphy->features & |
| NL80211_FEATURE_TDLS_CHANNEL_SWITCH; |
| bool wider_band = ieee80211_hw_check(&local->hw, TDLS_WIDER_BW) && |
| !ifmgd->tdls_wider_bw_prohibited; |
| bool buffer_sta = ieee80211_hw_check(&local->hw, |
| SUPPORTS_TDLS_BUFFER_STA); |
| struct ieee80211_supported_band *sband = ieee80211_get_sband(sdata); |
| bool vht = sband && sband->vht_cap.vht_supported; |
| u8 *pos = skb_put(skb, 10); |
| |
| *pos++ = WLAN_EID_EXT_CAPABILITY; |
| *pos++ = 8; /* len */ |
| *pos++ = 0x0; |
| *pos++ = 0x0; |
| *pos++ = 0x0; |
| *pos++ = (chan_switch ? WLAN_EXT_CAPA4_TDLS_CHAN_SWITCH : 0) | |
| (buffer_sta ? WLAN_EXT_CAPA4_TDLS_BUFFER_STA : 0); |
| *pos++ = WLAN_EXT_CAPA5_TDLS_ENABLED; |
| *pos++ = 0; |
| *pos++ = 0; |
| *pos++ = (vht && wider_band) ? WLAN_EXT_CAPA8_TDLS_WIDE_BW_ENABLED : 0; |
| } |
| |
| static u8 |
| ieee80211_tdls_add_subband(struct ieee80211_sub_if_data *sdata, |
| struct sk_buff *skb, u16 start, u16 end, |
| u16 spacing) |
| { |
| u8 subband_cnt = 0, ch_cnt = 0; |
| struct ieee80211_channel *ch; |
| struct cfg80211_chan_def chandef; |
| int i, subband_start; |
| struct wiphy *wiphy = sdata->local->hw.wiphy; |
| |
| for (i = start; i <= end; i += spacing) { |
| if (!ch_cnt) |
| subband_start = i; |
| |
| ch = ieee80211_get_channel(sdata->local->hw.wiphy, i); |
| if (ch) { |
| /* we will be active on the channel */ |
| cfg80211_chandef_create(&chandef, ch, |
| NL80211_CHAN_NO_HT); |
| if (cfg80211_reg_can_beacon_relax(wiphy, &chandef, |
| sdata->wdev.iftype)) { |
| ch_cnt++; |
| /* |
| * check if the next channel is also part of |
| * this allowed range |
| */ |
| continue; |
| } |
| } |
| |
| /* |
| * we've reached the end of a range, with allowed channels |
| * found |
| */ |
| if (ch_cnt) { |
| u8 *pos = skb_put(skb, 2); |
| *pos++ = ieee80211_frequency_to_channel(subband_start); |
| *pos++ = ch_cnt; |
| |
| subband_cnt++; |
| ch_cnt = 0; |
| } |
| } |
| |
| /* all channels in the requested range are allowed - add them here */ |
| if (ch_cnt) { |
| u8 *pos = skb_put(skb, 2); |
| *pos++ = ieee80211_frequency_to_channel(subband_start); |
| *pos++ = ch_cnt; |
| |
| subband_cnt++; |
| } |
| |
| return subband_cnt; |
| } |
| |
| static void |
| ieee80211_tdls_add_supp_channels(struct ieee80211_sub_if_data *sdata, |
| struct sk_buff *skb) |
| { |
| /* |
| * Add possible channels for TDLS. These are channels that are allowed |
| * to be active. |
| */ |
| u8 subband_cnt; |
| u8 *pos = skb_put(skb, 2); |
| |
| *pos++ = WLAN_EID_SUPPORTED_CHANNELS; |
| |
| /* |
| * 5GHz and 2GHz channels numbers can overlap. Ignore this for now, as |
| * this doesn't happen in real world scenarios. |
| */ |
| |
| /* 2GHz, with 5MHz spacing */ |
| subband_cnt = ieee80211_tdls_add_subband(sdata, skb, 2412, 2472, 5); |
| |
| /* 5GHz, with 20MHz spacing */ |
| subband_cnt += ieee80211_tdls_add_subband(sdata, skb, 5000, 5825, 20); |
| |
| /* length */ |
| *pos = 2 * subband_cnt; |
| } |
| |
| static void ieee80211_tdls_add_oper_classes(struct ieee80211_sub_if_data *sdata, |
| struct sk_buff *skb) |
| { |
| u8 *pos; |
| u8 op_class; |
| |
| if (!ieee80211_chandef_to_operating_class(&sdata->vif.bss_conf.chandef, |
| &op_class)) |
| return; |
| |
| pos = skb_put(skb, 4); |
| *pos++ = WLAN_EID_SUPPORTED_REGULATORY_CLASSES; |
| *pos++ = 2; /* len */ |
| |
| *pos++ = op_class; |
| *pos++ = op_class; /* give current operating class as alternate too */ |
| } |
| |
| static void ieee80211_tdls_add_bss_coex_ie(struct sk_buff *skb) |
| { |
| u8 *pos = skb_put(skb, 3); |
| |
| *pos++ = WLAN_EID_BSS_COEX_2040; |
| *pos++ = 1; /* len */ |
| |
| *pos++ = WLAN_BSS_COEX_INFORMATION_REQUEST; |
| } |
| |
| static u16 ieee80211_get_tdls_sta_capab(struct ieee80211_sub_if_data *sdata, |
| u16 status_code) |
| { |
| struct ieee80211_supported_band *sband; |
| |
| /* The capability will be 0 when sending a failure code */ |
| if (status_code != 0) |
| return 0; |
| |
| sband = ieee80211_get_sband(sdata); |
| if (sband && sband->band == NL80211_BAND_2GHZ) { |
| return WLAN_CAPABILITY_SHORT_SLOT_TIME | |
| WLAN_CAPABILITY_SHORT_PREAMBLE; |
| } |
| |
| return 0; |
| } |
| |
| static void ieee80211_tdls_add_link_ie(struct ieee80211_sub_if_data *sdata, |
| struct sk_buff *skb, const u8 *peer, |
| bool initiator) |
| { |
| struct ieee80211_tdls_lnkie *lnkid; |
| const u8 *init_addr, *rsp_addr; |
| |
| if (initiator) { |
| init_addr = sdata->vif.addr; |
| rsp_addr = peer; |
| } else { |
| init_addr = peer; |
| rsp_addr = sdata->vif.addr; |
| } |
| |
| lnkid = skb_put(skb, sizeof(struct ieee80211_tdls_lnkie)); |
| |
| lnkid->ie_type = WLAN_EID_LINK_ID; |
| lnkid->ie_len = sizeof(struct ieee80211_tdls_lnkie) - 2; |
| |
| memcpy(lnkid->bssid, sdata->u.mgd.bssid, ETH_ALEN); |
| memcpy(lnkid->init_sta, init_addr, ETH_ALEN); |
| memcpy(lnkid->resp_sta, rsp_addr, ETH_ALEN); |
| } |
| |
| static void |
| ieee80211_tdls_add_aid(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb) |
| { |
| u8 *pos = skb_put(skb, 4); |
| |
| *pos++ = WLAN_EID_AID; |
| *pos++ = 2; /* len */ |
| put_unaligned_le16(sdata->vif.bss_conf.aid, pos); |
| } |
| |
| /* translate numbering in the WMM parameter IE to the mac80211 notation */ |
| static enum ieee80211_ac_numbers ieee80211_ac_from_wmm(int ac) |
| { |
| switch (ac) { |
| default: |
| WARN_ON_ONCE(1); |
| /* fall through */ |
| case 0: |
| return IEEE80211_AC_BE; |
| case 1: |
| return IEEE80211_AC_BK; |
| case 2: |
| return IEEE80211_AC_VI; |
| case 3: |
| return IEEE80211_AC_VO; |
| } |
| } |
| |
| static u8 ieee80211_wmm_aci_aifsn(int aifsn, bool acm, int aci) |
| { |
| u8 ret; |
| |
| ret = aifsn & 0x0f; |
| if (acm) |
| ret |= 0x10; |
| ret |= (aci << 5) & 0x60; |
| return ret; |
| } |
| |
| static u8 ieee80211_wmm_ecw(u16 cw_min, u16 cw_max) |
| { |
| return ((ilog2(cw_min + 1) << 0x0) & 0x0f) | |
| ((ilog2(cw_max + 1) << 0x4) & 0xf0); |
| } |
| |
| static void ieee80211_tdls_add_wmm_param_ie(struct ieee80211_sub_if_data *sdata, |
| struct sk_buff *skb) |
| { |
| struct ieee80211_wmm_param_ie *wmm; |
| struct ieee80211_tx_queue_params *txq; |
| int i; |
| |
| wmm = skb_put_zero(skb, sizeof(*wmm)); |
| |
| wmm->element_id = WLAN_EID_VENDOR_SPECIFIC; |
| wmm->len = sizeof(*wmm) - 2; |
| |
| wmm->oui[0] = 0x00; /* Microsoft OUI 00:50:F2 */ |
| wmm->oui[1] = 0x50; |
| wmm->oui[2] = 0xf2; |
| wmm->oui_type = 2; /* WME */ |
| wmm->oui_subtype = 1; /* WME param */ |
| wmm->version = 1; /* WME ver */ |
| wmm->qos_info = 0; /* U-APSD not in use */ |
| |
| /* |
| * Use the EDCA parameters defined for the BSS, or default if the AP |
| * doesn't support it, as mandated by 802.11-2012 section 10.22.4 |
| */ |
| for (i = 0; i < IEEE80211_NUM_ACS; i++) { |
| txq = &sdata->tx_conf[ieee80211_ac_from_wmm(i)]; |
| wmm->ac[i].aci_aifsn = ieee80211_wmm_aci_aifsn(txq->aifs, |
| txq->acm, i); |
| wmm->ac[i].cw = ieee80211_wmm_ecw(txq->cw_min, txq->cw_max); |
| wmm->ac[i].txop_limit = cpu_to_le16(txq->txop); |
| } |
| } |
| |
| static void |
| ieee80211_tdls_chandef_vht_upgrade(struct ieee80211_sub_if_data *sdata, |
| struct sta_info *sta) |
| { |
| /* IEEE802.11ac-2013 Table E-4 */ |
| u16 centers_80mhz[] = { 5210, 5290, 5530, 5610, 5690, 5775 }; |
| struct cfg80211_chan_def uc = sta->tdls_chandef; |
| enum nl80211_chan_width max_width = ieee80211_sta_cap_chan_bw(sta); |
| int i; |
| |
| /* only support upgrading non-narrow channels up to 80Mhz */ |
| if (max_width == NL80211_CHAN_WIDTH_5 || |
| max_width == NL80211_CHAN_WIDTH_10) |
| return; |
| |
| if (max_width > NL80211_CHAN_WIDTH_80) |
| max_width = NL80211_CHAN_WIDTH_80; |
| |
| if (uc.width >= max_width) |
| return; |
| /* |
| * Channel usage constrains in the IEEE802.11ac-2013 specification only |
| * allow expanding a 20MHz channel to 80MHz in a single way. In |
| * addition, there are no 40MHz allowed channels that are not part of |
| * the allowed 80MHz range in the 5GHz spectrum (the relevant one here). |
| */ |
| for (i = 0; i < ARRAY_SIZE(centers_80mhz); i++) |
| if (abs(uc.chan->center_freq - centers_80mhz[i]) <= 30) { |
| uc.center_freq1 = centers_80mhz[i]; |
| uc.center_freq2 = 0; |
| uc.width = NL80211_CHAN_WIDTH_80; |
| break; |
| } |
| |
| if (!uc.center_freq1) |
| return; |
| |
| /* proceed to downgrade the chandef until usable or the same as AP BW */ |
| while (uc.width > max_width || |
| (uc.width > sta->tdls_chandef.width && |
| !cfg80211_reg_can_beacon_relax(sdata->local->hw.wiphy, &uc, |
| sdata->wdev.iftype))) |
| ieee80211_chandef_downgrade(&uc); |
| |
| if (!cfg80211_chandef_identical(&uc, &sta->tdls_chandef)) { |
| tdls_dbg(sdata, "TDLS ch width upgraded %d -> %d\n", |
| sta->tdls_chandef.width, uc.width); |
| |
| /* |
| * the station is not yet authorized when BW upgrade is done, |
| * locking is not required |
| */ |
| sta->tdls_chandef = uc; |
| } |
| } |
| |
| static void |
| ieee80211_tdls_add_setup_start_ies(struct ieee80211_sub_if_data *sdata, |
| struct sk_buff *skb, const u8 *peer, |
| u8 action_code, bool initiator, |
| const u8 *extra_ies, size_t extra_ies_len) |
| { |
| struct ieee80211_supported_band *sband; |
| struct ieee80211_local *local = sdata->local; |
| struct ieee80211_sta_ht_cap ht_cap; |
| struct ieee80211_sta_vht_cap vht_cap; |
| struct sta_info *sta = NULL; |
| size_t offset = 0, noffset; |
| u8 *pos; |
| |
| sband = ieee80211_get_sband(sdata); |
| if (!sband) |
| return; |
| |
| ieee80211_add_srates_ie(sdata, skb, false, sband->band); |
| ieee80211_add_ext_srates_ie(sdata, skb, false, sband->band); |
| ieee80211_tdls_add_supp_channels(sdata, skb); |
| |
| /* add any custom IEs that go before Extended Capabilities */ |
| if (extra_ies_len) { |
| static const u8 before_ext_cap[] = { |
| WLAN_EID_SUPP_RATES, |
| WLAN_EID_COUNTRY, |
| WLAN_EID_EXT_SUPP_RATES, |
| WLAN_EID_SUPPORTED_CHANNELS, |
| WLAN_EID_RSN, |
| }; |
| noffset = ieee80211_ie_split(extra_ies, extra_ies_len, |
| before_ext_cap, |
| ARRAY_SIZE(before_ext_cap), |
| offset); |
| skb_put_data(skb, extra_ies + offset, noffset - offset); |
| offset = noffset; |
| } |
| |
| ieee80211_tdls_add_ext_capab(sdata, skb); |
| |
| /* add the QoS element if we support it */ |
| if (local->hw.queues >= IEEE80211_NUM_ACS && |
| action_code != WLAN_PUB_ACTION_TDLS_DISCOVER_RES) |
| ieee80211_add_wmm_info_ie(skb_put(skb, 9), 0); /* no U-APSD */ |
| |
| /* add any custom IEs that go before HT capabilities */ |
| if (extra_ies_len) { |
| static const u8 before_ht_cap[] = { |
| WLAN_EID_SUPP_RATES, |
| WLAN_EID_COUNTRY, |
| WLAN_EID_EXT_SUPP_RATES, |
| WLAN_EID_SUPPORTED_CHANNELS, |
| WLAN_EID_RSN, |
| WLAN_EID_EXT_CAPABILITY, |
| WLAN_EID_QOS_CAPA, |
| WLAN_EID_FAST_BSS_TRANSITION, |
| WLAN_EID_TIMEOUT_INTERVAL, |
| WLAN_EID_SUPPORTED_REGULATORY_CLASSES, |
| }; |
| noffset = ieee80211_ie_split(extra_ies, extra_ies_len, |
| before_ht_cap, |
| ARRAY_SIZE(before_ht_cap), |
| offset); |
| skb_put_data(skb, extra_ies + offset, noffset - offset); |
| offset = noffset; |
| } |
| |
| mutex_lock(&local->sta_mtx); |
| |
| /* we should have the peer STA if we're already responding */ |
| if (action_code == WLAN_TDLS_SETUP_RESPONSE) { |
| sta = sta_info_get(sdata, peer); |
| if (WARN_ON_ONCE(!sta)) { |
| mutex_unlock(&local->sta_mtx); |
| return; |
| } |
| |
| sta->tdls_chandef = sdata->vif.bss_conf.chandef; |
| } |
| |
| ieee80211_tdls_add_oper_classes(sdata, skb); |
| |
| /* |
| * with TDLS we can switch channels, and HT-caps are not necessarily |
| * the same on all bands. The specification limits the setup to a |
| * single HT-cap, so use the current band for now. |
| */ |
| memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap)); |
| |
| if ((action_code == WLAN_TDLS_SETUP_REQUEST || |
| action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) && |
| ht_cap.ht_supported) { |
| ieee80211_apply_htcap_overrides(sdata, &ht_cap); |
| |
| /* disable SMPS in TDLS initiator */ |
| ht_cap.cap |= WLAN_HT_CAP_SM_PS_DISABLED |
| << IEEE80211_HT_CAP_SM_PS_SHIFT; |
| |
| pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2); |
| ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap); |
| } else if (action_code == WLAN_TDLS_SETUP_RESPONSE && |
| ht_cap.ht_supported && sta->sta.ht_cap.ht_supported) { |
| /* the peer caps are already intersected with our own */ |
| memcpy(&ht_cap, &sta->sta.ht_cap, sizeof(ht_cap)); |
| |
| pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2); |
| ieee80211_ie_build_ht_cap(pos, &ht_cap, ht_cap.cap); |
| } |
| |
| if (ht_cap.ht_supported && |
| (ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40)) |
| ieee80211_tdls_add_bss_coex_ie(skb); |
| |
| ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator); |
| |
| /* add any custom IEs that go before VHT capabilities */ |
| if (extra_ies_len) { |
| static const u8 before_vht_cap[] = { |
| WLAN_EID_SUPP_RATES, |
| WLAN_EID_COUNTRY, |
| WLAN_EID_EXT_SUPP_RATES, |
| WLAN_EID_SUPPORTED_CHANNELS, |
| WLAN_EID_RSN, |
| WLAN_EID_EXT_CAPABILITY, |
| WLAN_EID_QOS_CAPA, |
| WLAN_EID_FAST_BSS_TRANSITION, |
| WLAN_EID_TIMEOUT_INTERVAL, |
| WLAN_EID_SUPPORTED_REGULATORY_CLASSES, |
| WLAN_EID_MULTI_BAND, |
| }; |
| noffset = ieee80211_ie_split(extra_ies, extra_ies_len, |
| before_vht_cap, |
| ARRAY_SIZE(before_vht_cap), |
| offset); |
| skb_put_data(skb, extra_ies + offset, noffset - offset); |
| offset = noffset; |
| } |
| |
| /* build the VHT-cap similarly to the HT-cap */ |
| memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap)); |
| if ((action_code == WLAN_TDLS_SETUP_REQUEST || |
| action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) && |
| vht_cap.vht_supported) { |
| ieee80211_apply_vhtcap_overrides(sdata, &vht_cap); |
| |
| /* the AID is present only when VHT is implemented */ |
| if (action_code == WLAN_TDLS_SETUP_REQUEST) |
| ieee80211_tdls_add_aid(sdata, skb); |
| |
| pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2); |
| ieee80211_ie_build_vht_cap(pos, &vht_cap, vht_cap.cap); |
| } else if (action_code == WLAN_TDLS_SETUP_RESPONSE && |
| vht_cap.vht_supported && sta->sta.vht_cap.vht_supported) { |
| /* the peer caps are already intersected with our own */ |
| memcpy(&vht_cap, &sta->sta.vht_cap, sizeof(vht_cap)); |
| |
| /* the AID is present only when VHT is implemented */ |
| ieee80211_tdls_add_aid(sdata, skb); |
| |
| pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2); |
| ieee80211_ie_build_vht_cap(pos, &vht_cap, vht_cap.cap); |
| |
| /* |
| * if both peers support WIDER_BW, we can expand the chandef to |
| * a wider compatible one, up to 80MHz |
| */ |
| if (test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW)) |
| ieee80211_tdls_chandef_vht_upgrade(sdata, sta); |
| } |
| |
| mutex_unlock(&local->sta_mtx); |
| |
| /* add any remaining IEs */ |
| if (extra_ies_len) { |
| noffset = extra_ies_len; |
| skb_put_data(skb, extra_ies + offset, noffset - offset); |
| } |
| |
| } |
| |
| static void |
| ieee80211_tdls_add_setup_cfm_ies(struct ieee80211_sub_if_data *sdata, |
| struct sk_buff *skb, const u8 *peer, |
| bool initiator, const u8 *extra_ies, |
| size_t extra_ies_len) |
| { |
| struct ieee80211_local *local = sdata->local; |
| struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; |
| size_t offset = 0, noffset; |
| struct sta_info *sta, *ap_sta; |
| struct ieee80211_supported_band *sband; |
| u8 *pos; |
| |
| sband = ieee80211_get_sband(sdata); |
| if (!sband) |
| return; |
| |
| mutex_lock(&local->sta_mtx); |
| |
| sta = sta_info_get(sdata, peer); |
| ap_sta = sta_info_get(sdata, ifmgd->bssid); |
| if (WARN_ON_ONCE(!sta || !ap_sta)) { |
| mutex_unlock(&local->sta_mtx); |
| return; |
| } |
| |
| sta->tdls_chandef = sdata->vif.bss_conf.chandef; |
| |
| /* add any custom IEs that go before the QoS IE */ |
| if (extra_ies_len) { |
| static const u8 before_qos[] = { |
| WLAN_EID_RSN, |
| }; |
| noffset = ieee80211_ie_split(extra_ies, extra_ies_len, |
| before_qos, |
| ARRAY_SIZE(before_qos), |
| offset); |
| skb_put_data(skb, extra_ies + offset, noffset - offset); |
| offset = noffset; |
| } |
| |
| /* add the QoS param IE if both the peer and we support it */ |
| if (local->hw.queues >= IEEE80211_NUM_ACS && sta->sta.wme) |
| ieee80211_tdls_add_wmm_param_ie(sdata, skb); |
| |
| /* add any custom IEs that go before HT operation */ |
| if (extra_ies_len) { |
| static const u8 before_ht_op[] = { |
| WLAN_EID_RSN, |
| WLAN_EID_QOS_CAPA, |
| WLAN_EID_FAST_BSS_TRANSITION, |
| WLAN_EID_TIMEOUT_INTERVAL, |
| }; |
| noffset = ieee80211_ie_split(extra_ies, extra_ies_len, |
| before_ht_op, |
| ARRAY_SIZE(before_ht_op), |
| offset); |
| skb_put_data(skb, extra_ies + offset, noffset - offset); |
| offset = noffset; |
| } |
| |
| /* |
| * if HT support is only added in TDLS, we need an HT-operation IE. |
| * add the IE as required by IEEE802.11-2012 9.23.3.2. |
| */ |
| if (!ap_sta->sta.ht_cap.ht_supported && sta->sta.ht_cap.ht_supported) { |
| u16 prot = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED | |
| IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT | |
| IEEE80211_HT_OP_MODE_NON_HT_STA_PRSNT; |
| |
| pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_operation)); |
| ieee80211_ie_build_ht_oper(pos, &sta->sta.ht_cap, |
| &sdata->vif.bss_conf.chandef, prot, |
| true); |
| } |
| |
| ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator); |
| |
| /* only include VHT-operation if not on the 2.4GHz band */ |
| if (sband->band != NL80211_BAND_2GHZ && |
| sta->sta.vht_cap.vht_supported) { |
| /* |
| * if both peers support WIDER_BW, we can expand the chandef to |
| * a wider compatible one, up to 80MHz |
| */ |
| if (test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW)) |
| ieee80211_tdls_chandef_vht_upgrade(sdata, sta); |
| |
| pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_operation)); |
| ieee80211_ie_build_vht_oper(pos, &sta->sta.vht_cap, |
| &sta->tdls_chandef); |
| } |
| |
| mutex_unlock(&local->sta_mtx); |
| |
| /* add any remaining IEs */ |
| if (extra_ies_len) { |
| noffset = extra_ies_len; |
| skb_put_data(skb, extra_ies + offset, noffset - offset); |
| } |
| } |
| |
| static void |
| ieee80211_tdls_add_chan_switch_req_ies(struct ieee80211_sub_if_data *sdata, |
| struct sk_buff *skb, const u8 *peer, |
| bool initiator, const u8 *extra_ies, |
| size_t extra_ies_len, u8 oper_class, |
| struct cfg80211_chan_def *chandef) |
| { |
| struct ieee80211_tdls_data *tf; |
| size_t offset = 0, noffset; |
| |
| if (WARN_ON_ONCE(!chandef)) |
| return; |
| |
| tf = (void *)skb->data; |
| tf->u.chan_switch_req.target_channel = |
| ieee80211_frequency_to_channel(chandef->chan->center_freq); |
| tf->u.chan_switch_req.oper_class = oper_class; |
| |
| if (extra_ies_len) { |
| static const u8 before_lnkie[] = { |
| WLAN_EID_SECONDARY_CHANNEL_OFFSET, |
| }; |
| noffset = ieee80211_ie_split(extra_ies, extra_ies_len, |
| before_lnkie, |
| ARRAY_SIZE(before_lnkie), |
| offset); |
| skb_put_data(skb, extra_ies + offset, noffset - offset); |
| offset = noffset; |
| } |
| |
| ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator); |
| |
| /* add any remaining IEs */ |
| if (extra_ies_len) { |
| noffset = extra_ies_len; |
| skb_put_data(skb, extra_ies + offset, noffset - offset); |
| } |
| } |
| |
| static void |
| ieee80211_tdls_add_chan_switch_resp_ies(struct ieee80211_sub_if_data *sdata, |
| struct sk_buff *skb, const u8 *peer, |
| u16 status_code, bool initiator, |
| const u8 *extra_ies, |
| size_t extra_ies_len) |
| { |
| if (status_code == 0) |
| ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator); |
| |
| if (extra_ies_len) |
| skb_put_data(skb, extra_ies, extra_ies_len); |
| } |
| |
| static void ieee80211_tdls_add_ies(struct ieee80211_sub_if_data *sdata, |
| struct sk_buff *skb, const u8 *peer, |
| u8 action_code, u16 status_code, |
| bool initiator, const u8 *extra_ies, |
| size_t extra_ies_len, u8 oper_class, |
| struct cfg80211_chan_def *chandef) |
| { |
| switch (action_code) { |
| case WLAN_TDLS_SETUP_REQUEST: |
| case WLAN_TDLS_SETUP_RESPONSE: |
| case WLAN_PUB_ACTION_TDLS_DISCOVER_RES: |
| if (status_code == 0) |
| ieee80211_tdls_add_setup_start_ies(sdata, skb, peer, |
| action_code, |
| initiator, |
| extra_ies, |
| extra_ies_len); |
| break; |
| case WLAN_TDLS_SETUP_CONFIRM: |
| if (status_code == 0) |
| ieee80211_tdls_add_setup_cfm_ies(sdata, skb, peer, |
| initiator, extra_ies, |
| extra_ies_len); |
| break; |
| case WLAN_TDLS_TEARDOWN: |
| case WLAN_TDLS_DISCOVERY_REQUEST: |
| if (extra_ies_len) |
| skb_put_data(skb, extra_ies, extra_ies_len); |
| if (status_code == 0 || action_code == WLAN_TDLS_TEARDOWN) |
| ieee80211_tdls_add_link_ie(sdata, skb, peer, initiator); |
| break; |
| case WLAN_TDLS_CHANNEL_SWITCH_REQUEST: |
| ieee80211_tdls_add_chan_switch_req_ies(sdata, skb, peer, |
| initiator, extra_ies, |
| extra_ies_len, |
| oper_class, chandef); |
| break; |
| case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE: |
| ieee80211_tdls_add_chan_switch_resp_ies(sdata, skb, peer, |
| status_code, |
| initiator, extra_ies, |
| extra_ies_len); |
| break; |
| } |
| |
| } |
| |
| static int |
| ieee80211_prep_tdls_encap_data(struct wiphy *wiphy, struct net_device *dev, |
| const u8 *peer, u8 action_code, u8 dialog_token, |
| u16 status_code, struct sk_buff *skb) |
| { |
| struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); |
| struct ieee80211_tdls_data *tf; |
| |
| tf = skb_put(skb, offsetof(struct ieee80211_tdls_data, u)); |
| |
| memcpy(tf->da, peer, ETH_ALEN); |
| memcpy(tf->sa, sdata->vif.addr, ETH_ALEN); |
| tf->ether_type = cpu_to_be16(ETH_P_TDLS); |
| tf->payload_type = WLAN_TDLS_SNAP_RFTYPE; |
| |
| /* network header is after the ethernet header */ |
| skb_set_network_header(skb, ETH_HLEN); |
| |
| switch (action_code) { |
| case WLAN_TDLS_SETUP_REQUEST: |
| tf->category = WLAN_CATEGORY_TDLS; |
| tf->action_code = WLAN_TDLS_SETUP_REQUEST; |
| |
| skb_put(skb, sizeof(tf->u.setup_req)); |
| tf->u.setup_req.dialog_token = dialog_token; |
| tf->u.setup_req.capability = |
| cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata, |
| status_code)); |
| break; |
| case WLAN_TDLS_SETUP_RESPONSE: |
| tf->category = WLAN_CATEGORY_TDLS; |
| tf->action_code = WLAN_TDLS_SETUP_RESPONSE; |
| |
| skb_put(skb, sizeof(tf->u.setup_resp)); |
| tf->u.setup_resp.status_code = cpu_to_le16(status_code); |
| tf->u.setup_resp.dialog_token = dialog_token; |
| tf->u.setup_resp.capability = |
| cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata, |
| status_code)); |
| break; |
| case WLAN_TDLS_SETUP_CONFIRM: |
| tf->category = WLAN_CATEGORY_TDLS; |
| tf->action_code = WLAN_TDLS_SETUP_CONFIRM; |
| |
| skb_put(skb, sizeof(tf->u.setup_cfm)); |
| tf->u.setup_cfm.status_code = cpu_to_le16(status_code); |
| tf->u.setup_cfm.dialog_token = dialog_token; |
| break; |
| case WLAN_TDLS_TEARDOWN: |
| tf->category = WLAN_CATEGORY_TDLS; |
| tf->action_code = WLAN_TDLS_TEARDOWN; |
| |
| skb_put(skb, sizeof(tf->u.teardown)); |
| tf->u.teardown.reason_code = cpu_to_le16(status_code); |
| break; |
| case WLAN_TDLS_DISCOVERY_REQUEST: |
| tf->category = WLAN_CATEGORY_TDLS; |
| tf->action_code = WLAN_TDLS_DISCOVERY_REQUEST; |
| |
| skb_put(skb, sizeof(tf->u.discover_req)); |
| tf->u.discover_req.dialog_token = dialog_token; |
| break; |
| case WLAN_TDLS_CHANNEL_SWITCH_REQUEST: |
| tf->category = WLAN_CATEGORY_TDLS; |
| tf->action_code = WLAN_TDLS_CHANNEL_SWITCH_REQUEST; |
| |
| skb_put(skb, sizeof(tf->u.chan_switch_req)); |
| break; |
| case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE: |
| tf->category = WLAN_CATEGORY_TDLS; |
| tf->action_code = WLAN_TDLS_CHANNEL_SWITCH_RESPONSE; |
| |
| skb_put(skb, sizeof(tf->u.chan_switch_resp)); |
| tf->u.chan_switch_resp.status_code = cpu_to_le16(status_code); |
| break; |
| default: |
| return -EINVAL; |
| } |
| |
| return 0; |
| } |
| |
| static int |
| ieee80211_prep_tdls_direct(struct wiphy *wiphy, struct net_device *dev, |
| const u8 *peer, u8 action_code, u8 dialog_token, |
| u16 status_code, struct sk_buff *skb) |
| { |
| struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); |
| struct ieee80211_mgmt *mgmt; |
| |
| mgmt = skb_put_zero(skb, 24); |
| memcpy(mgmt->da, peer, ETH_ALEN); |
| memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN); |
| memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN); |
| |
| mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
| IEEE80211_STYPE_ACTION); |
| |
| switch (action_code) { |
| case WLAN_PUB_ACTION_TDLS_DISCOVER_RES: |
| skb_put(skb, 1 + sizeof(mgmt->u.action.u.tdls_discover_resp)); |
| mgmt->u.action.category = WLAN_CATEGORY_PUBLIC; |
| mgmt->u.action.u.tdls_discover_resp.action_code = |
| WLAN_PUB_ACTION_TDLS_DISCOVER_RES; |
| mgmt->u.action.u.tdls_discover_resp.dialog_token = |
| dialog_token; |
| mgmt->u.action.u.tdls_discover_resp.capability = |
| cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata, |
| status_code)); |
| break; |
| default: |
| return -EINVAL; |
| } |
| |
| return 0; |
| } |
| |
| static struct sk_buff * |
| ieee80211_tdls_build_mgmt_packet_data(struct ieee80211_sub_if_data *sdata, |
| const u8 *peer, u8 action_code, |
| u8 dialog_token, u16 status_code, |
| bool initiator, const u8 *extra_ies, |
| size_t extra_ies_len, u8 oper_class, |
| struct cfg80211_chan_def *chandef) |
| { |
| struct ieee80211_local *local = sdata->local; |
| struct sk_buff *skb; |
| int ret; |
| |
| skb = netdev_alloc_skb(sdata->dev, |
| local->hw.extra_tx_headroom + |
| max(sizeof(struct ieee80211_mgmt), |
| sizeof(struct ieee80211_tdls_data)) + |
| 50 + /* supported rates */ |
| 10 + /* ext capab */ |
| 26 + /* max(WMM-info, WMM-param) */ |
| 2 + max(sizeof(struct ieee80211_ht_cap), |
| sizeof(struct ieee80211_ht_operation)) + |
| 2 + max(sizeof(struct ieee80211_vht_cap), |
| sizeof(struct ieee80211_vht_operation)) + |
| 50 + /* supported channels */ |
| 3 + /* 40/20 BSS coex */ |
| 4 + /* AID */ |
| 4 + /* oper classes */ |
| extra_ies_len + |
| sizeof(struct ieee80211_tdls_lnkie)); |
| if (!skb) |
| return NULL; |
| |
| skb_reserve(skb, local->hw.extra_tx_headroom); |
| |
| switch (action_code) { |
| case WLAN_TDLS_SETUP_REQUEST: |
| case WLAN_TDLS_SETUP_RESPONSE: |
| case WLAN_TDLS_SETUP_CONFIRM: |
| case WLAN_TDLS_TEARDOWN: |
| case WLAN_TDLS_DISCOVERY_REQUEST: |
| case WLAN_TDLS_CHANNEL_SWITCH_REQUEST: |
| case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE: |
| ret = ieee80211_prep_tdls_encap_data(local->hw.wiphy, |
| sdata->dev, peer, |
| action_code, dialog_token, |
| status_code, skb); |
| break; |
| case WLAN_PUB_ACTION_TDLS_DISCOVER_RES: |
| ret = ieee80211_prep_tdls_direct(local->hw.wiphy, sdata->dev, |
| peer, action_code, |
| dialog_token, status_code, |
| skb); |
| break; |
| default: |
| ret = -ENOTSUPP; |
| break; |
| } |
| |
| if (ret < 0) |
| goto fail; |
| |
| ieee80211_tdls_add_ies(sdata, skb, peer, action_code, status_code, |
| initiator, extra_ies, extra_ies_len, oper_class, |
| chandef); |
| return skb; |
| |
| fail: |
| dev_kfree_skb(skb); |
| return NULL; |
| } |
| |
| static int |
| ieee80211_tdls_prep_mgmt_packet(struct wiphy *wiphy, struct net_device *dev, |
| const u8 *peer, u8 action_code, u8 dialog_token, |
| u16 status_code, u32 peer_capability, |
| bool initiator, const u8 *extra_ies, |
| size_t extra_ies_len, u8 oper_class, |
| struct cfg80211_chan_def *chandef) |
| { |
| struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); |
| struct sk_buff *skb = NULL; |
| struct sta_info *sta; |
| u32 flags = 0; |
| int ret = 0; |
| |
| rcu_read_lock(); |
| sta = sta_info_get(sdata, peer); |
| |
| /* infer the initiator if we can, to support old userspace */ |
| switch (action_code) { |
| case WLAN_TDLS_SETUP_REQUEST: |
| if (sta) { |
| set_sta_flag(sta, WLAN_STA_TDLS_INITIATOR); |
| sta->sta.tdls_initiator = false; |
| } |
| /* fall-through */ |
| case WLAN_TDLS_SETUP_CONFIRM: |
| case WLAN_TDLS_DISCOVERY_REQUEST: |
| initiator = true; |
| break; |
| case WLAN_TDLS_SETUP_RESPONSE: |
| /* |
| * In some testing scenarios, we send a request and response. |
| * Make the last packet sent take effect for the initiator |
| * value. |
| */ |
| if (sta) { |
| clear_sta_flag(sta, WLAN_STA_TDLS_INITIATOR); |
| sta->sta.tdls_initiator = true; |
| } |
| /* fall-through */ |
| case WLAN_PUB_ACTION_TDLS_DISCOVER_RES: |
| initiator = false; |
| break; |
| case WLAN_TDLS_TEARDOWN: |
| case WLAN_TDLS_CHANNEL_SWITCH_REQUEST: |
| case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE: |
| /* any value is ok */ |
| break; |
| default: |
| ret = -ENOTSUPP; |
| break; |
| } |
| |
| if (sta && test_sta_flag(sta, WLAN_STA_TDLS_INITIATOR)) |
| initiator = true; |
| |
| rcu_read_unlock(); |
| if (ret < 0) |
| goto fail; |
| |
| skb = ieee80211_tdls_build_mgmt_packet_data(sdata, peer, action_code, |
| dialog_token, status_code, |
| initiator, extra_ies, |
| extra_ies_len, oper_class, |
| chandef); |
| if (!skb) { |
| ret = -EINVAL; |
| goto fail; |
| } |
| |
| if (action_code == WLAN_PUB_ACTION_TDLS_DISCOVER_RES) { |
| ieee80211_tx_skb(sdata, skb); |
| return 0; |
| } |
| |
| /* |
| * According to 802.11z: Setup req/resp are sent in AC_BK, otherwise |
| * we should default to AC_VI. |
| */ |
| switch (action_code) { |
| case WLAN_TDLS_SETUP_REQUEST: |
| case WLAN_TDLS_SETUP_RESPONSE: |
| skb->priority = 256 + 2; |
| break; |
| default: |
| skb->priority = 256 + 5; |
| break; |
| } |
| skb_set_queue_mapping(skb, ieee80211_select_queue(sdata, skb)); |
| |
| /* |
| * Set the WLAN_TDLS_TEARDOWN flag to indicate a teardown in progress. |
| * Later, if no ACK is returned from peer, we will re-send the teardown |
| * packet through the AP. |
| */ |
| if ((action_code == WLAN_TDLS_TEARDOWN) && |
| ieee80211_hw_check(&sdata->local->hw, REPORTS_TX_ACK_STATUS)) { |
| bool try_resend; /* Should we keep skb for possible resend */ |
| |
| /* If not sending directly to peer - no point in keeping skb */ |
| rcu_read_lock(); |
| sta = sta_info_get(sdata, peer); |
| try_resend = sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH); |
| rcu_read_unlock(); |
| |
| spin_lock_bh(&sdata->u.mgd.teardown_lock); |
| if (try_resend && !sdata->u.mgd.teardown_skb) { |
| /* Mark it as requiring TX status callback */ |
| flags |= IEEE80211_TX_CTL_REQ_TX_STATUS | |
| IEEE80211_TX_INTFL_MLME_CONN_TX; |
| |
| /* |
| * skb is copied since mac80211 will later set |
| * properties that might not be the same as the AP, |
| * such as encryption, QoS, addresses, etc. |
| * |
| * No problem if skb_copy() fails, so no need to check. |
| */ |
| sdata->u.mgd.teardown_skb = skb_copy(skb, GFP_ATOMIC); |
| sdata->u.mgd.orig_teardown_skb = skb; |
| } |
| spin_unlock_bh(&sdata->u.mgd.teardown_lock); |
| } |
| |
| /* disable bottom halves when entering the Tx path */ |
| local_bh_disable(); |
| __ieee80211_subif_start_xmit(skb, dev, flags, 0, NULL); |
| local_bh_enable(); |
| |
| return ret; |
| |
| fail: |
| dev_kfree_skb(skb); |
| return ret; |
| } |
| |
| static int |
| ieee80211_tdls_mgmt_setup(struct wiphy *wiphy, struct net_device *dev, |
| const u8 *peer, u8 action_code, u8 dialog_token, |
| u16 status_code, u32 peer_capability, bool initiator, |
| const u8 *extra_ies, size_t extra_ies_len) |
| { |
| struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); |
| struct ieee80211_local *local = sdata->local; |
| enum ieee80211_smps_mode smps_mode = sdata->u.mgd.driver_smps_mode; |
| int ret; |
| |
| /* don't support setup with forced SMPS mode that's not off */ |
| if (smps_mode != IEEE80211_SMPS_AUTOMATIC && |
| smps_mode != IEEE80211_SMPS_OFF) { |
| tdls_dbg(sdata, "Aborting TDLS setup due to SMPS mode %d\n", |
| smps_mode); |
| return -ENOTSUPP; |
| } |
| |
| mutex_lock(&local->mtx); |
| |
| /* we don't support concurrent TDLS peer setups */ |
| if (!is_zero_ether_addr(sdata->u.mgd.tdls_peer) && |
| !ether_addr_equal(sdata->u.mgd.tdls_peer, peer)) { |
| ret = -EBUSY; |
| goto out_unlock; |
| } |
| |
| /* |
| * make sure we have a STA representing the peer so we drop or buffer |
| * non-TDLS-setup frames to the peer. We can't send other packets |
| * during setup through the AP path. |
| * Allow error packets to be sent - sometimes we don't even add a STA |
| * before failing the setup. |
| */ |
| if (status_code == 0) { |
| rcu_read_lock(); |
| if (!sta_info_get(sdata, peer)) { |
| rcu_read_unlock(); |
| ret = -ENOLINK; |
| goto out_unlock; |
| } |
| rcu_read_unlock(); |
| } |
| |
| ieee80211_flush_queues(local, sdata, false); |
| memcpy(sdata->u.mgd.tdls_peer, peer, ETH_ALEN); |
| mutex_unlock(&local->mtx); |
| |
| /* we cannot take the mutex while preparing the setup packet */ |
| ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, action_code, |
| dialog_token, status_code, |
| peer_capability, initiator, |
| extra_ies, extra_ies_len, 0, |
| NULL); |
| if (ret < 0) { |
| mutex_lock(&local->mtx); |
| eth_zero_addr(sdata->u.mgd.tdls_peer); |
| mutex_unlock(&local->mtx); |
| return ret; |
| } |
| |
| ieee80211_queue_delayed_work(&sdata->local->hw, |
| &sdata->u.mgd.tdls_peer_del_work, |
| TDLS_PEER_SETUP_TIMEOUT); |
| return 0; |
| |
| out_unlock: |
| mutex_unlock(&local->mtx); |
| return ret; |
| } |
| |
| static int |
| ieee80211_tdls_mgmt_teardown(struct wiphy *wiphy, struct net_device *dev, |
| const u8 *peer, u8 action_code, u8 dialog_token, |
| u16 status_code, u32 peer_capability, |
| bool initiator, const u8 *extra_ies, |
| size_t extra_ies_len) |
| { |
| struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); |
| struct ieee80211_local *local = sdata->local; |
| struct sta_info *sta; |
| int ret; |
| |
| /* |
| * No packets can be transmitted to the peer via the AP during setup - |
| * the STA is set as a TDLS peer, but is not authorized. |
| * During teardown, we prevent direct transmissions by stopping the |
| * queues and flushing all direct packets. |
| */ |
| ieee80211_stop_vif_queues(local, sdata, |
| IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN); |
| ieee80211_flush_queues(local, sdata, false); |
| |
| ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, action_code, |
| dialog_token, status_code, |
| peer_capability, initiator, |
| extra_ies, extra_ies_len, 0, |
| NULL); |
| if (ret < 0) |
| sdata_err(sdata, "Failed sending TDLS teardown packet %d\n", |
| ret); |
| |
| /* |
| * Remove the STA AUTH flag to force further traffic through the AP. If |
| * the STA was unreachable, it was already removed. |
| */ |
| rcu_read_lock(); |
| sta = sta_info_get(sdata, peer); |
| if (sta) |
| clear_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH); |
| rcu_read_unlock(); |
| |
| ieee80211_wake_vif_queues(local, sdata, |
| IEEE80211_QUEUE_STOP_REASON_TDLS_TEARDOWN); |
| |
| return 0; |
| } |
| |
| int ieee80211_tdls_mgmt(struct wiphy *wiphy, struct net_device *dev, |
| const u8 *peer, u8 action_code, u8 dialog_token, |
| u16 status_code, u32 peer_capability, |
| bool initiator, const u8 *extra_ies, |
| size_t extra_ies_len) |
| { |
| struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); |
| int ret; |
| |
| if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS)) |
| return -ENOTSUPP; |
| |
| /* make sure we are in managed mode, and associated */ |
| if (sdata->vif.type != NL80211_IFTYPE_STATION || |
| !sdata->u.mgd.associated) |
| return -EINVAL; |
| |
| switch (action_code) { |
| case WLAN_TDLS_SETUP_REQUEST: |
| case WLAN_TDLS_SETUP_RESPONSE: |
| ret = ieee80211_tdls_mgmt_setup(wiphy, dev, peer, action_code, |
| dialog_token, status_code, |
| peer_capability, initiator, |
| extra_ies, extra_ies_len); |
| break; |
| case WLAN_TDLS_TEARDOWN: |
| ret = ieee80211_tdls_mgmt_teardown(wiphy, dev, peer, |
| action_code, dialog_token, |
| status_code, |
| peer_capability, initiator, |
| extra_ies, extra_ies_len); |
| break; |
| case WLAN_TDLS_DISCOVERY_REQUEST: |
| /* |
| * Protect the discovery so we can hear the TDLS discovery |
| * response frame. It is transmitted directly and not buffered |
| * by the AP. |
| */ |
| drv_mgd_protect_tdls_discover(sdata->local, sdata); |
| /* fall-through */ |
| case WLAN_TDLS_SETUP_CONFIRM: |
| case WLAN_PUB_ACTION_TDLS_DISCOVER_RES: |
| /* no special handling */ |
| ret = ieee80211_tdls_prep_mgmt_packet(wiphy, dev, peer, |
| action_code, |
| dialog_token, |
| status_code, |
| peer_capability, |
| initiator, extra_ies, |
| extra_ies_len, 0, NULL); |
| break; |
| default: |
| ret = -EOPNOTSUPP; |
| break; |
| } |
| |
| tdls_dbg(sdata, "TDLS mgmt action %d peer %pM status %d\n", |
| action_code, peer, ret); |
| return ret; |
| } |
| |
| static void iee80211_tdls_recalc_chanctx(struct ieee80211_sub_if_data *sdata, |
| struct sta_info *sta) |
| { |
| struct ieee80211_local *local = sdata->local; |
| struct ieee80211_chanctx_conf *conf; |
| struct ieee80211_chanctx *ctx; |
| enum nl80211_chan_width width; |
| struct ieee80211_supported_band *sband; |
| |
| mutex_lock(&local->chanctx_mtx); |
| conf = rcu_dereference_protected(sdata->vif.chanctx_conf, |
| lockdep_is_held(&local->chanctx_mtx)); |
| if (conf) { |
| width = conf->def.width; |
| sband = local->hw.wiphy->bands[conf->def.chan->band]; |
| ctx = container_of(conf, struct ieee80211_chanctx, conf); |
| ieee80211_recalc_chanctx_chantype(local, ctx); |
| |
| /* if width changed and a peer is given, update its BW */ |
| if (width != conf->def.width && sta && |
| test_sta_flag(sta, WLAN_STA_TDLS_WIDER_BW)) { |
| enum ieee80211_sta_rx_bandwidth bw; |
| |
| bw = ieee80211_chan_width_to_rx_bw(conf->def.width); |
| bw = min(bw, ieee80211_sta_cap_rx_bw(sta)); |
| if (bw != sta->sta.bandwidth) { |
| sta->sta.bandwidth = bw; |
| rate_control_rate_update(local, sband, sta, |
| IEEE80211_RC_BW_CHANGED); |
| /* |
| * if a TDLS peer BW was updated, we need to |
| * recalc the chandef width again, to get the |
| * correct chanctx min_def |
| */ |
| ieee80211_recalc_chanctx_chantype(local, ctx); |
| } |
| } |
| |
| } |
| mutex_unlock(&local->chanctx_mtx); |
| } |
| |
| static int iee80211_tdls_have_ht_peers(struct ieee80211_sub_if_data *sdata) |
| { |
| struct sta_info *sta; |
| bool result = false; |
| |
| rcu_read_lock(); |
| list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) { |
| if (!sta->sta.tdls || sta->sdata != sdata || !sta->uploaded || |
| !test_sta_flag(sta, WLAN_STA_AUTHORIZED) || |
| !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH) || |
| !sta->sta.ht_cap.ht_supported) |
| continue; |
| result = true; |
| break; |
| } |
| rcu_read_unlock(); |
| |
| return result; |
| } |
| |
| static void |
| iee80211_tdls_recalc_ht_protection(struct ieee80211_sub_if_data *sdata, |
| struct sta_info *sta) |
| { |
| struct ieee80211_if_managed *ifmgd = &sdata->u.mgd; |
| bool tdls_ht; |
| u16 protection = IEEE80211_HT_OP_MODE_PROTECTION_NONHT_MIXED | |
| IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT | |
| IEEE80211_HT_OP_MODE_NON_HT_STA_PRSNT; |
| u16 opmode; |
| |
| /* Nothing to do if the BSS connection uses HT */ |
| if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) |
| return; |
| |
| tdls_ht = (sta && sta->sta.ht_cap.ht_supported) || |
| iee80211_tdls_have_ht_peers(sdata); |
| |
| opmode = sdata->vif.bss_conf.ht_operation_mode; |
| |
| if (tdls_ht) |
| opmode |= protection; |
| else |
| opmode &= ~protection; |
| |
| if (opmode == sdata->vif.bss_conf.ht_operation_mode) |
| return; |
| |
| sdata->vif.bss_conf.ht_operation_mode = opmode; |
| ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_HT); |
| } |
| |
| int ieee80211_tdls_oper(struct wiphy *wiphy, struct net_device *dev, |
| const u8 *peer, enum nl80211_tdls_operation oper) |
| { |
| struct sta_info *sta; |
| struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); |
| struct ieee80211_local *local = sdata->local; |
| int ret; |
| |
| if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS)) |
| return -ENOTSUPP; |
| |
| if (sdata->vif.type != NL80211_IFTYPE_STATION) |
| return -EINVAL; |
| |
| switch (oper) { |
| case NL80211_TDLS_ENABLE_LINK: |
| case NL80211_TDLS_DISABLE_LINK: |
| break; |
| case NL80211_TDLS_TEARDOWN: |
| case NL80211_TDLS_SETUP: |
| case NL80211_TDLS_DISCOVERY_REQ: |
| /* We don't support in-driver setup/teardown/discovery */ |
| return -ENOTSUPP; |
| } |
| |
| /* protect possible bss_conf changes and avoid concurrency in |
| * ieee80211_bss_info_change_notify() |
| */ |
| sdata_lock(sdata); |
| mutex_lock(&local->mtx); |
| tdls_dbg(sdata, "TDLS oper %d peer %pM\n", oper, peer); |
| |
| switch (oper) { |
| case NL80211_TDLS_ENABLE_LINK: |
| if (sdata->vif.csa_active) { |
| tdls_dbg(sdata, "TDLS: disallow link during CSA\n"); |
| ret = -EBUSY; |
| break; |
| } |
| |
| mutex_lock(&local->sta_mtx); |
| sta = sta_info_get(sdata, peer); |
| if (!sta) { |
| mutex_unlock(&local->sta_mtx); |
| ret = -ENOLINK; |
| break; |
| } |
| |
| iee80211_tdls_recalc_chanctx(sdata, sta); |
| iee80211_tdls_recalc_ht_protection(sdata, sta); |
| |
| set_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH); |
| mutex_unlock(&local->sta_mtx); |
| |
| WARN_ON_ONCE(is_zero_ether_addr(sdata->u.mgd.tdls_peer) || |
| !ether_addr_equal(sdata->u.mgd.tdls_peer, peer)); |
| ret = 0; |
| break; |
| case NL80211_TDLS_DISABLE_LINK: |
| /* |
| * The teardown message in ieee80211_tdls_mgmt_teardown() was |
| * created while the queues were stopped, so it might still be |
| * pending. Before flushing the queues we need to be sure the |
| * message is handled by the tasklet handling pending messages, |
| * otherwise we might start destroying the station before |
| * sending the teardown packet. |
| * Note that this only forces the tasklet to flush pendings - |
| * not to stop the tasklet from rescheduling itself. |
| */ |
| tasklet_kill(&local->tx_pending_tasklet); |
| /* flush a potentially queued teardown packet */ |
| ieee80211_flush_queues(local, sdata, false); |
| |
| ret = sta_info_destroy_addr(sdata, peer); |
| |
| mutex_lock(&local->sta_mtx); |
| iee80211_tdls_recalc_ht_protection(sdata, NULL); |
| mutex_unlock(&local->sta_mtx); |
| |
| iee80211_tdls_recalc_chanctx(sdata, NULL); |
| break; |
| default: |
| ret = -ENOTSUPP; |
| break; |
| } |
| |
| if (ret == 0 && ether_addr_equal(sdata->u.mgd.tdls_peer, peer)) { |
| cancel_delayed_work(&sdata->u.mgd.tdls_peer_del_work); |
| eth_zero_addr(sdata->u.mgd.tdls_peer); |
| } |
| |
| if (ret == 0) |
| ieee80211_queue_work(&sdata->local->hw, |
| &sdata->u.mgd.request_smps_work); |
| |
| mutex_unlock(&local->mtx); |
| sdata_unlock(sdata); |
| return ret; |
| } |
| |
| void ieee80211_tdls_oper_request(struct ieee80211_vif *vif, const u8 *peer, |
| enum nl80211_tdls_operation oper, |
| u16 reason_code, gfp_t gfp) |
| { |
| struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif); |
| |
| if (vif->type != NL80211_IFTYPE_STATION || !vif->bss_conf.assoc) { |
| sdata_err(sdata, "Discarding TDLS oper %d - not STA or disconnected\n", |
| oper); |
| return; |
| } |
| |
| cfg80211_tdls_oper_request(sdata->dev, peer, oper, reason_code, gfp); |
| } |
| EXPORT_SYMBOL(ieee80211_tdls_oper_request); |
| |
| static void |
| iee80211_tdls_add_ch_switch_timing(u8 *buf, u16 switch_time, u16 switch_timeout) |
| { |
| struct ieee80211_ch_switch_timing *ch_sw; |
| |
| *buf++ = WLAN_EID_CHAN_SWITCH_TIMING; |
| *buf++ = sizeof(struct ieee80211_ch_switch_timing); |
| |
| ch_sw = (void *)buf; |
| ch_sw->switch_time = cpu_to_le16(switch_time); |
| ch_sw->switch_timeout = cpu_to_le16(switch_timeout); |
| } |
| |
| /* find switch timing IE in SKB ready for Tx */ |
| static const u8 *ieee80211_tdls_find_sw_timing_ie(struct sk_buff *skb) |
| { |
| struct ieee80211_tdls_data *tf; |
| const u8 *ie_start; |
| |
| /* |
| * Get the offset for the new location of the switch timing IE. |
| * The SKB network header will now point to the "payload_type" |
| * element of the TDLS data frame struct. |
| */ |
| tf = container_of(skb->data + skb_network_offset(skb), |
| struct ieee80211_tdls_data, payload_type); |
| ie_start = tf->u.chan_switch_req.variable; |
| return cfg80211_find_ie(WLAN_EID_CHAN_SWITCH_TIMING, ie_start, |
| skb->len - (ie_start - skb->data)); |
| } |
| |
| static struct sk_buff * |
| ieee80211_tdls_ch_sw_tmpl_get(struct sta_info *sta, u8 oper_class, |
| struct cfg80211_chan_def *chandef, |
| u32 *ch_sw_tm_ie_offset) |
| { |
| struct ieee80211_sub_if_data *sdata = sta->sdata; |
| u8 extra_ies[2 + sizeof(struct ieee80211_sec_chan_offs_ie) + |
| 2 + sizeof(struct ieee80211_ch_switch_timing)]; |
| int extra_ies_len = 2 + sizeof(struct ieee80211_ch_switch_timing); |
| u8 *pos = extra_ies; |
| struct sk_buff *skb; |
| |
| /* |
| * if chandef points to a wide channel add a Secondary-Channel |
| * Offset information element |
| */ |
| if (chandef->width == NL80211_CHAN_WIDTH_40) { |
| struct ieee80211_sec_chan_offs_ie *sec_chan_ie; |
| bool ht40plus; |
| |
| *pos++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET; |
| *pos++ = sizeof(*sec_chan_ie); |
| sec_chan_ie = (void *)pos; |
| |
| ht40plus = cfg80211_get_chandef_type(chandef) == |
| NL80211_CHAN_HT40PLUS; |
| sec_chan_ie->sec_chan_offs = ht40plus ? |
| IEEE80211_HT_PARAM_CHA_SEC_ABOVE : |
| IEEE80211_HT_PARAM_CHA_SEC_BELOW; |
| pos += sizeof(*sec_chan_ie); |
| |
| extra_ies_len += 2 + sizeof(struct ieee80211_sec_chan_offs_ie); |
| } |
| |
| /* just set the values to 0, this is a template */ |
| iee80211_tdls_add_ch_switch_timing(pos, 0, 0); |
| |
| skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr, |
| WLAN_TDLS_CHANNEL_SWITCH_REQUEST, |
| 0, 0, !sta->sta.tdls_initiator, |
| extra_ies, extra_ies_len, |
| oper_class, chandef); |
| if (!skb) |
| return NULL; |
| |
| skb = ieee80211_build_data_template(sdata, skb, 0); |
| if (IS_ERR(skb)) { |
| tdls_dbg(sdata, "Failed building TDLS channel switch frame\n"); |
| return NULL; |
| } |
| |
| if (ch_sw_tm_ie_offset) { |
| const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb); |
| |
| if (!tm_ie) { |
| tdls_dbg(sdata, "No switch timing IE in TDLS switch\n"); |
| dev_kfree_skb_any(skb); |
| return NULL; |
| } |
| |
| *ch_sw_tm_ie_offset = tm_ie - skb->data; |
| } |
| |
| tdls_dbg(sdata, |
| "TDLS channel switch request template for %pM ch %d width %d\n", |
| sta->sta.addr, chandef->chan->center_freq, chandef->width); |
| return skb; |
| } |
| |
| int |
| ieee80211_tdls_channel_switch(struct wiphy *wiphy, struct net_device *dev, |
| const u8 *addr, u8 oper_class, |
| struct cfg80211_chan_def *chandef) |
| { |
| struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); |
| struct ieee80211_local *local = sdata->local; |
| struct sta_info *sta; |
| struct sk_buff *skb = NULL; |
| u32 ch_sw_tm_ie; |
| int ret; |
| |
| if (chandef->chan->freq_offset) |
| /* this may work, but is untested */ |
| return -EOPNOTSUPP; |
| |
| mutex_lock(&local->sta_mtx); |
| sta = sta_info_get(sdata, addr); |
| if (!sta) { |
| tdls_dbg(sdata, |
| "Invalid TDLS peer %pM for channel switch request\n", |
| addr); |
| ret = -ENOENT; |
| goto out; |
| } |
| |
| if (!test_sta_flag(sta, WLAN_STA_TDLS_CHAN_SWITCH)) { |
| tdls_dbg(sdata, "TDLS channel switch unsupported by %pM\n", |
| addr); |
| ret = -ENOTSUPP; |
| goto out; |
| } |
| |
| skb = ieee80211_tdls_ch_sw_tmpl_get(sta, oper_class, chandef, |
| &ch_sw_tm_ie); |
| if (!skb) { |
| ret = -ENOENT; |
| goto out; |
| } |
| |
| ret = drv_tdls_channel_switch(local, sdata, &sta->sta, oper_class, |
| chandef, skb, ch_sw_tm_ie); |
| if (!ret) |
| set_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL); |
| |
| out: |
| mutex_unlock(&local->sta_mtx); |
| dev_kfree_skb_any(skb); |
| return ret; |
| } |
| |
| void |
| ieee80211_tdls_cancel_channel_switch(struct wiphy *wiphy, |
| struct net_device *dev, |
| const u8 *addr) |
| { |
| struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); |
| struct ieee80211_local *local = sdata->local; |
| struct sta_info *sta; |
| |
| mutex_lock(&local->sta_mtx); |
| sta = sta_info_get(sdata, addr); |
| if (!sta) { |
| tdls_dbg(sdata, |
| "Invalid TDLS peer %pM for channel switch cancel\n", |
| addr); |
| goto out; |
| } |
| |
| if (!test_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL)) { |
| tdls_dbg(sdata, "TDLS channel switch not initiated by %pM\n", |
| addr); |
| goto out; |
| } |
| |
| drv_tdls_cancel_channel_switch(local, sdata, &sta->sta); |
| clear_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL); |
| |
| out: |
| mutex_unlock(&local->sta_mtx); |
| } |
| |
| static struct sk_buff * |
| ieee80211_tdls_ch_sw_resp_tmpl_get(struct sta_info *sta, |
| u32 *ch_sw_tm_ie_offset) |
| { |
| struct ieee80211_sub_if_data *sdata = sta->sdata; |
| struct sk_buff *skb; |
| u8 extra_ies[2 + sizeof(struct ieee80211_ch_switch_timing)]; |
| |
| /* initial timing are always zero in the template */ |
| iee80211_tdls_add_ch_switch_timing(extra_ies, 0, 0); |
| |
| skb = ieee80211_tdls_build_mgmt_packet_data(sdata, sta->sta.addr, |
| WLAN_TDLS_CHANNEL_SWITCH_RESPONSE, |
| 0, 0, !sta->sta.tdls_initiator, |
| extra_ies, sizeof(extra_ies), 0, NULL); |
| if (!skb) |
| return NULL; |
| |
| skb = ieee80211_build_data_template(sdata, skb, 0); |
| if (IS_ERR(skb)) { |
| tdls_dbg(sdata, |
| "Failed building TDLS channel switch resp frame\n"); |
| return NULL; |
| } |
| |
| if (ch_sw_tm_ie_offset) { |
| const u8 *tm_ie = ieee80211_tdls_find_sw_timing_ie(skb); |
| |
| if (!tm_ie) { |
| tdls_dbg(sdata, |
| "No switch timing IE in TDLS switch resp\n"); |
| dev_kfree_skb_any(skb); |
| return NULL; |
| } |
| |
| *ch_sw_tm_ie_offset = tm_ie - skb->data; |
| } |
| |
| tdls_dbg(sdata, "TDLS get channel switch response template for %pM\n", |
| sta->sta.addr); |
| return skb; |
| } |
| |
| static int |
| ieee80211_process_tdls_channel_switch_resp(struct ieee80211_sub_if_data *sdata, |
| struct sk_buff *skb) |
| { |
| struct ieee80211_local *local = sdata->local; |
| struct ieee802_11_elems elems; |
| struct sta_info *sta; |
| struct ieee80211_tdls_data *tf = (void *)skb->data; |
| bool local_initiator; |
| struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb); |
| int baselen = offsetof(typeof(*tf), u.chan_switch_resp.variable); |
| struct ieee80211_tdls_ch_sw_params params = {}; |
| int ret; |
| |
| params.action_code = WLAN_TDLS_CHANNEL_SWITCH_RESPONSE; |
| params.timestamp = rx_status->device_timestamp; |
| |
| if (skb->len < baselen) { |
| tdls_dbg(sdata, "TDLS channel switch resp too short: %d\n", |
| skb->len); |
| return -EINVAL; |
| } |
| |
| mutex_lock(&local->sta_mtx); |
| sta = sta_info_get(sdata, tf->sa); |
| if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) { |
| tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n", |
| tf->sa); |
| ret = -EINVAL; |
| goto out; |
| } |
| |
| params.sta = &sta->sta; |
| params.status = le16_to_cpu(tf->u.chan_switch_resp.status_code); |
| if (params.status != 0) { |
| ret = 0; |
| goto call_drv; |
| } |
| |
| ieee802_11_parse_elems(tf->u.chan_switch_resp.variable, |
| skb->len - baselen, false, &elems, |
| NULL, NULL); |
| if (elems.parse_error) { |
| tdls_dbg(sdata, "Invalid IEs in TDLS channel switch resp\n"); |
| ret = -EINVAL; |
| goto out; |
| } |
| |
| if (!elems.ch_sw_timing || !elems.lnk_id) { |
| tdls_dbg(sdata, "TDLS channel switch resp - missing IEs\n"); |
| ret = -EINVAL; |
| goto out; |
| } |
| |
| /* validate the initiator is set correctly */ |
| local_initiator = |
| !memcmp(elems.lnk_id->init_sta, sdata->vif.addr, ETH_ALEN); |
| if (local_initiator == sta->sta.tdls_initiator) { |
| tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n"); |
| ret = -EINVAL; |
| goto out; |
| } |
| |
| params.switch_time = le16_to_cpu(elems.ch_sw_timing->switch_time); |
| params.switch_timeout = le16_to_cpu(elems.ch_sw_timing->switch_timeout); |
| |
| params.tmpl_skb = |
| ieee80211_tdls_ch_sw_resp_tmpl_get(sta, ¶ms.ch_sw_tm_ie); |
| if (!params.tmpl_skb) { |
| ret = -ENOENT; |
| goto out; |
| } |
| |
| ret = 0; |
| call_drv: |
| drv_tdls_recv_channel_switch(sdata->local, sdata, ¶ms); |
| |
| tdls_dbg(sdata, |
| "TDLS channel switch response received from %pM status %d\n", |
| tf->sa, params.status); |
| |
| out: |
| mutex_unlock(&local->sta_mtx); |
| dev_kfree_skb_any(params.tmpl_skb); |
| return ret; |
| } |
| |
| static int |
| ieee80211_process_tdls_channel_switch_req(struct ieee80211_sub_if_data *sdata, |
| struct sk_buff *skb) |
| { |
| struct ieee80211_local *local = sdata->local; |
| struct ieee802_11_elems elems; |
| struct cfg80211_chan_def chandef; |
| struct ieee80211_channel *chan; |
| enum nl80211_channel_type chan_type; |
| int freq; |
| u8 target_channel, oper_class; |
| bool local_initiator; |
| struct sta_info *sta; |
| enum nl80211_band band; |
| struct ieee80211_tdls_data *tf = (void *)skb->data; |
| struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb); |
| int baselen = offsetof(typeof(*tf), u.chan_switch_req.variable); |
| struct ieee80211_tdls_ch_sw_params params = {}; |
| int ret = 0; |
| |
| params.action_code = WLAN_TDLS_CHANNEL_SWITCH_REQUEST; |
| params.timestamp = rx_status->device_timestamp; |
| |
| if (skb->len < baselen) { |
| tdls_dbg(sdata, "TDLS channel switch req too short: %d\n", |
| skb->len); |
| return -EINVAL; |
| } |
| |
| target_channel = tf->u.chan_switch_req.target_channel; |
| oper_class = tf->u.chan_switch_req.oper_class; |
| |
| /* |
| * We can't easily infer the channel band. The operating class is |
| * ambiguous - there are multiple tables (US/Europe/JP/Global). The |
| * solution here is to treat channels with number >14 as 5GHz ones, |
| * and specifically check for the (oper_class, channel) combinations |
| * where this doesn't hold. These are thankfully unique according to |
| * IEEE802.11-2012. |
| * We consider only the 2GHz and 5GHz bands and 20MHz+ channels as |
| * valid here. |
| */ |
| if ((oper_class == 112 || oper_class == 2 || oper_class == 3 || |
| oper_class == 4 || oper_class == 5 || oper_class == 6) && |
| target_channel < 14) |
| band = NL80211_BAND_5GHZ; |
| else |
| band = target_channel < 14 ? NL80211_BAND_2GHZ : |
| NL80211_BAND_5GHZ; |
| |
| freq = ieee80211_channel_to_frequency(target_channel, band); |
| if (freq == 0) { |
| tdls_dbg(sdata, "Invalid channel in TDLS chan switch: %d\n", |
| target_channel); |
| return -EINVAL; |
| } |
| |
| chan = ieee80211_get_channel(sdata->local->hw.wiphy, freq); |
| if (!chan) { |
| tdls_dbg(sdata, |
| "Unsupported channel for TDLS chan switch: %d\n", |
| target_channel); |
| return -EINVAL; |
| } |
| |
| ieee802_11_parse_elems(tf->u.chan_switch_req.variable, |
| skb->len - baselen, false, &elems, NULL, NULL); |
| if (elems.parse_error) { |
| tdls_dbg(sdata, "Invalid IEs in TDLS channel switch req\n"); |
| return -EINVAL; |
| } |
| |
| if (!elems.ch_sw_timing || !elems.lnk_id) { |
| tdls_dbg(sdata, "TDLS channel switch req - missing IEs\n"); |
| return -EINVAL; |
| } |
| |
| if (!elems.sec_chan_offs) { |
| chan_type = NL80211_CHAN_HT20; |
| } else { |
| switch (elems.sec_chan_offs->sec_chan_offs) { |
| case IEEE80211_HT_PARAM_CHA_SEC_ABOVE: |
| chan_type = NL80211_CHAN_HT40PLUS; |
| break; |
| case IEEE80211_HT_PARAM_CHA_SEC_BELOW: |
| chan_type = NL80211_CHAN_HT40MINUS; |
| break; |
| default: |
| chan_type = NL80211_CHAN_HT20; |
| break; |
| } |
| } |
| |
| cfg80211_chandef_create(&chandef, chan, chan_type); |
| |
| /* we will be active on the TDLS link */ |
| if (!cfg80211_reg_can_beacon_relax(sdata->local->hw.wiphy, &chandef, |
| sdata->wdev.iftype)) { |
| tdls_dbg(sdata, "TDLS chan switch to forbidden channel\n"); |
| return -EINVAL; |
| } |
| |
| mutex_lock(&local->sta_mtx); |
| sta = sta_info_get(sdata, tf->sa); |
| if (!sta || !test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH)) { |
| tdls_dbg(sdata, "TDLS chan switch from non-peer sta %pM\n", |
| tf->sa); |
| ret = -EINVAL; |
| goto out; |
| } |
| |
| params.sta = &sta->sta; |
| |
| /* validate the initiator is set correctly */ |
| local_initiator = |
| !memcmp(elems.lnk_id->init_sta, sdata->vif.addr, ETH_ALEN); |
| if (local_initiator == sta->sta.tdls_initiator) { |
| tdls_dbg(sdata, "TDLS chan switch invalid lnk-id initiator\n"); |
| ret = -EINVAL; |
| goto out; |
| } |
| |
| /* peer should have known better */ |
| if (!sta->sta.ht_cap.ht_supported && elems.sec_chan_offs && |
| elems.sec_chan_offs->sec_chan_offs) { |
| tdls_dbg(sdata, "TDLS chan switch - wide chan unsupported\n"); |
| ret = -ENOTSUPP; |
| goto out; |
| } |
| |
| params.chandef = &chandef; |
| params.switch_time = le16_to_cpu(elems.ch_sw_timing->switch_time); |
| params.switch_timeout = le16_to_cpu(elems.ch_sw_timing->switch_timeout); |
| |
| params.tmpl_skb = |
| ieee80211_tdls_ch_sw_resp_tmpl_get(sta, |
| ¶ms.ch_sw_tm_ie); |
| if (!params.tmpl_skb) { |
| ret = -ENOENT; |
| goto out; |
| } |
| |
| drv_tdls_recv_channel_switch(sdata->local, sdata, ¶ms); |
| |
| tdls_dbg(sdata, |
| "TDLS ch switch request received from %pM ch %d width %d\n", |
| tf->sa, params.chandef->chan->center_freq, |
| params.chandef->width); |
| out: |
| mutex_unlock(&local->sta_mtx); |
| dev_kfree_skb_any(params.tmpl_skb); |
| return ret; |
| } |
| |
| static void |
| ieee80211_process_tdls_channel_switch(struct ieee80211_sub_if_data *sdata, |
| struct sk_buff *skb) |
| { |
| struct ieee80211_tdls_data *tf = (void *)skb->data; |
| struct wiphy *wiphy = sdata->local->hw.wiphy; |
| |
| ASSERT_RTNL(); |
| |
| /* make sure the driver supports it */ |
| if (!(wiphy->features & NL80211_FEATURE_TDLS_CHANNEL_SWITCH)) |
| return; |
| |
| /* we want to access the entire packet */ |
| if (skb_linearize(skb)) |
| return; |
| /* |
| * The packet/size was already validated by mac80211 Rx path, only look |
| * at the action type. |
| */ |
| switch (tf->action_code) { |
| case WLAN_TDLS_CHANNEL_SWITCH_REQUEST: |
| ieee80211_process_tdls_channel_switch_req(sdata, skb); |
| break; |
| case WLAN_TDLS_CHANNEL_SWITCH_RESPONSE: |
| ieee80211_process_tdls_channel_switch_resp(sdata, skb); |
| break; |
| default: |
| WARN_ON_ONCE(1); |
| return; |
| } |
| } |
| |
| void ieee80211_teardown_tdls_peers(struct ieee80211_sub_if_data *sdata) |
| { |
| struct sta_info *sta; |
| u16 reason = WLAN_REASON_TDLS_TEARDOWN_UNSPECIFIED; |
| |
| rcu_read_lock(); |
| list_for_each_entry_rcu(sta, &sdata->local->sta_list, list) { |
| if (!sta->sta.tdls || sta->sdata != sdata || !sta->uploaded || |
| !test_sta_flag(sta, WLAN_STA_AUTHORIZED)) |
| continue; |
| |
| ieee80211_tdls_oper_request(&sdata->vif, sta->sta.addr, |
| NL80211_TDLS_TEARDOWN, reason, |
| GFP_ATOMIC); |
| } |
| rcu_read_unlock(); |
| } |
| |
| void ieee80211_tdls_chsw_work(struct work_struct *wk) |
| { |
| struct ieee80211_local *local = |
| container_of(wk, struct ieee80211_local, tdls_chsw_work); |
| struct ieee80211_sub_if_data *sdata; |
| struct sk_buff *skb; |
| struct ieee80211_tdls_data *tf; |
| |
| rtnl_lock(); |
| while ((skb = skb_dequeue(&local->skb_queue_tdls_chsw))) { |
| tf = (struct ieee80211_tdls_data *)skb->data; |
| list_for_each_entry(sdata, &local->interfaces, list) { |
| if (!ieee80211_sdata_running(sdata) || |
| sdata->vif.type != NL80211_IFTYPE_STATION || |
| !ether_addr_equal(tf->da, sdata->vif.addr)) |
| continue; |
| |
| ieee80211_process_tdls_channel_switch(sdata, skb); |
| break; |
| } |
| |
| kfree_skb(skb); |
| } |
| rtnl_unlock(); |
| } |
| |
| void ieee80211_tdls_handle_disconnect(struct ieee80211_sub_if_data *sdata, |
| const u8 *peer, u16 reason) |
| { |
| struct ieee80211_sta *sta; |
| |
| rcu_read_lock(); |
| sta = ieee80211_find_sta(&sdata->vif, peer); |
| if (!sta || !sta->tdls) { |
| rcu_read_unlock(); |
| return; |
| } |
| rcu_read_unlock(); |
| |
| tdls_dbg(sdata, "disconnected from TDLS peer %pM (Reason: %u=%s)\n", |
| peer, reason, |
| ieee80211_get_reason_code_string(reason)); |
| |
| ieee80211_tdls_oper_request(&sdata->vif, peer, |
| NL80211_TDLS_TEARDOWN, |
| WLAN_REASON_TDLS_TEARDOWN_UNREACHABLE, |
| GFP_ATOMIC); |
| } |