326 lines
8.7 KiB
C
326 lines
8.7 KiB
C
/*
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* mac80211 TDLS handling code
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*
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* Copyright 2006-2010 Johannes Berg <johannes@sipsolutions.net>
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* Copyright 2014, Intel Corporation
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*
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* This file is GPLv2 as found in COPYING.
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*/
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#include <linux/ieee80211.h>
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#include "ieee80211_i.h"
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static void ieee80211_tdls_add_ext_capab(struct sk_buff *skb)
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{
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u8 *pos = (void *)skb_put(skb, 7);
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*pos++ = WLAN_EID_EXT_CAPABILITY;
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*pos++ = 5; /* len */
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*pos++ = 0x0;
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*pos++ = 0x0;
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*pos++ = 0x0;
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*pos++ = 0x0;
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*pos++ = WLAN_EXT_CAPA5_TDLS_ENABLED;
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}
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static u16 ieee80211_get_tdls_sta_capab(struct ieee80211_sub_if_data *sdata)
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{
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struct ieee80211_local *local = sdata->local;
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u16 capab;
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capab = 0;
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if (ieee80211_get_sdata_band(sdata) != IEEE80211_BAND_2GHZ)
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return capab;
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if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
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capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
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if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
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capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
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return capab;
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}
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static void ieee80211_tdls_add_link_ie(struct sk_buff *skb, const u8 *src_addr,
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const u8 *peer, const u8 *bssid)
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{
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struct ieee80211_tdls_lnkie *lnkid;
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lnkid = (void *)skb_put(skb, sizeof(struct ieee80211_tdls_lnkie));
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lnkid->ie_type = WLAN_EID_LINK_ID;
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lnkid->ie_len = sizeof(struct ieee80211_tdls_lnkie) - 2;
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memcpy(lnkid->bssid, bssid, ETH_ALEN);
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memcpy(lnkid->init_sta, src_addr, ETH_ALEN);
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memcpy(lnkid->resp_sta, peer, ETH_ALEN);
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}
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static int
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ieee80211_prep_tdls_encap_data(struct wiphy *wiphy, struct net_device *dev,
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const u8 *peer, u8 action_code, u8 dialog_token,
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u16 status_code, struct sk_buff *skb)
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{
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struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
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enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
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struct ieee80211_tdls_data *tf;
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tf = (void *)skb_put(skb, offsetof(struct ieee80211_tdls_data, u));
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memcpy(tf->da, peer, ETH_ALEN);
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memcpy(tf->sa, sdata->vif.addr, ETH_ALEN);
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tf->ether_type = cpu_to_be16(ETH_P_TDLS);
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tf->payload_type = WLAN_TDLS_SNAP_RFTYPE;
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switch (action_code) {
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case WLAN_TDLS_SETUP_REQUEST:
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tf->category = WLAN_CATEGORY_TDLS;
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tf->action_code = WLAN_TDLS_SETUP_REQUEST;
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skb_put(skb, sizeof(tf->u.setup_req));
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tf->u.setup_req.dialog_token = dialog_token;
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tf->u.setup_req.capability =
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cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata));
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ieee80211_add_srates_ie(sdata, skb, false, band);
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ieee80211_add_ext_srates_ie(sdata, skb, false, band);
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ieee80211_tdls_add_ext_capab(skb);
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break;
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case WLAN_TDLS_SETUP_RESPONSE:
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tf->category = WLAN_CATEGORY_TDLS;
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tf->action_code = WLAN_TDLS_SETUP_RESPONSE;
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skb_put(skb, sizeof(tf->u.setup_resp));
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tf->u.setup_resp.status_code = cpu_to_le16(status_code);
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tf->u.setup_resp.dialog_token = dialog_token;
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tf->u.setup_resp.capability =
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cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata));
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ieee80211_add_srates_ie(sdata, skb, false, band);
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ieee80211_add_ext_srates_ie(sdata, skb, false, band);
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ieee80211_tdls_add_ext_capab(skb);
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break;
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case WLAN_TDLS_SETUP_CONFIRM:
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tf->category = WLAN_CATEGORY_TDLS;
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tf->action_code = WLAN_TDLS_SETUP_CONFIRM;
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skb_put(skb, sizeof(tf->u.setup_cfm));
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tf->u.setup_cfm.status_code = cpu_to_le16(status_code);
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tf->u.setup_cfm.dialog_token = dialog_token;
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break;
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case WLAN_TDLS_TEARDOWN:
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tf->category = WLAN_CATEGORY_TDLS;
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tf->action_code = WLAN_TDLS_TEARDOWN;
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skb_put(skb, sizeof(tf->u.teardown));
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tf->u.teardown.reason_code = cpu_to_le16(status_code);
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break;
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case WLAN_TDLS_DISCOVERY_REQUEST:
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tf->category = WLAN_CATEGORY_TDLS;
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tf->action_code = WLAN_TDLS_DISCOVERY_REQUEST;
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skb_put(skb, sizeof(tf->u.discover_req));
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tf->u.discover_req.dialog_token = dialog_token;
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break;
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default:
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return -EINVAL;
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}
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return 0;
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}
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static int
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ieee80211_prep_tdls_direct(struct wiphy *wiphy, struct net_device *dev,
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const u8 *peer, u8 action_code, u8 dialog_token,
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u16 status_code, struct sk_buff *skb)
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{
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struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
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enum ieee80211_band band = ieee80211_get_sdata_band(sdata);
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struct ieee80211_mgmt *mgmt;
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mgmt = (void *)skb_put(skb, 24);
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memset(mgmt, 0, 24);
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memcpy(mgmt->da, peer, ETH_ALEN);
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memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
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memcpy(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN);
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mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
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IEEE80211_STYPE_ACTION);
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switch (action_code) {
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case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
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skb_put(skb, 1 + sizeof(mgmt->u.action.u.tdls_discover_resp));
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mgmt->u.action.category = WLAN_CATEGORY_PUBLIC;
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mgmt->u.action.u.tdls_discover_resp.action_code =
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WLAN_PUB_ACTION_TDLS_DISCOVER_RES;
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mgmt->u.action.u.tdls_discover_resp.dialog_token =
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dialog_token;
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mgmt->u.action.u.tdls_discover_resp.capability =
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cpu_to_le16(ieee80211_get_tdls_sta_capab(sdata));
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ieee80211_add_srates_ie(sdata, skb, false, band);
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ieee80211_add_ext_srates_ie(sdata, skb, false, band);
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ieee80211_tdls_add_ext_capab(skb);
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break;
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default:
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return -EINVAL;
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}
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return 0;
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}
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int ieee80211_tdls_mgmt(struct wiphy *wiphy, struct net_device *dev,
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const u8 *peer, u8 action_code, u8 dialog_token,
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u16 status_code, u32 peer_capability,
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const u8 *extra_ies, size_t extra_ies_len)
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{
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struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
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struct ieee80211_local *local = sdata->local;
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struct sk_buff *skb = NULL;
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bool send_direct;
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int ret;
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if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS))
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return -ENOTSUPP;
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/* make sure we are in managed mode, and associated */
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if (sdata->vif.type != NL80211_IFTYPE_STATION ||
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!sdata->u.mgd.associated)
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return -EINVAL;
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tdls_dbg(sdata, "TDLS mgmt action %d peer %pM\n",
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action_code, peer);
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skb = dev_alloc_skb(local->hw.extra_tx_headroom +
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max(sizeof(struct ieee80211_mgmt),
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sizeof(struct ieee80211_tdls_data)) +
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50 + /* supported rates */
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7 + /* ext capab */
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extra_ies_len +
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sizeof(struct ieee80211_tdls_lnkie));
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if (!skb)
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return -ENOMEM;
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skb_reserve(skb, local->hw.extra_tx_headroom);
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switch (action_code) {
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case WLAN_TDLS_SETUP_REQUEST:
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case WLAN_TDLS_SETUP_RESPONSE:
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case WLAN_TDLS_SETUP_CONFIRM:
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case WLAN_TDLS_TEARDOWN:
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case WLAN_TDLS_DISCOVERY_REQUEST:
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ret = ieee80211_prep_tdls_encap_data(wiphy, dev, peer,
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action_code, dialog_token,
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status_code, skb);
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send_direct = false;
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break;
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case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
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ret = ieee80211_prep_tdls_direct(wiphy, dev, peer, action_code,
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dialog_token, status_code,
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skb);
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send_direct = true;
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break;
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default:
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ret = -ENOTSUPP;
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break;
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}
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if (ret < 0)
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goto fail;
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if (extra_ies_len)
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memcpy(skb_put(skb, extra_ies_len), extra_ies, extra_ies_len);
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/* the TDLS link IE is always added last */
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switch (action_code) {
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case WLAN_TDLS_SETUP_REQUEST:
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case WLAN_TDLS_SETUP_CONFIRM:
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case WLAN_TDLS_TEARDOWN:
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case WLAN_TDLS_DISCOVERY_REQUEST:
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/* we are the initiator */
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ieee80211_tdls_add_link_ie(skb, sdata->vif.addr, peer,
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sdata->u.mgd.bssid);
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break;
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case WLAN_TDLS_SETUP_RESPONSE:
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case WLAN_PUB_ACTION_TDLS_DISCOVER_RES:
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/* we are the responder */
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ieee80211_tdls_add_link_ie(skb, peer, sdata->vif.addr,
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sdata->u.mgd.bssid);
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break;
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default:
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ret = -ENOTSUPP;
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goto fail;
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}
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if (send_direct) {
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ieee80211_tx_skb(sdata, skb);
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return 0;
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}
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/*
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* According to 802.11z: Setup req/resp are sent in AC_BK, otherwise
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* we should default to AC_VI.
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*/
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switch (action_code) {
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case WLAN_TDLS_SETUP_REQUEST:
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case WLAN_TDLS_SETUP_RESPONSE:
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skb_set_queue_mapping(skb, IEEE80211_AC_BK);
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skb->priority = 2;
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break;
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default:
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skb_set_queue_mapping(skb, IEEE80211_AC_VI);
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skb->priority = 5;
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break;
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}
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/* disable bottom halves when entering the Tx path */
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local_bh_disable();
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ret = ieee80211_subif_start_xmit(skb, dev);
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local_bh_enable();
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return ret;
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fail:
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dev_kfree_skb(skb);
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return ret;
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}
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int ieee80211_tdls_oper(struct wiphy *wiphy, struct net_device *dev,
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const u8 *peer, enum nl80211_tdls_operation oper)
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{
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struct sta_info *sta;
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struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
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if (!(wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS))
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return -ENOTSUPP;
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if (sdata->vif.type != NL80211_IFTYPE_STATION)
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return -EINVAL;
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tdls_dbg(sdata, "TDLS oper %d peer %pM\n", oper, peer);
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switch (oper) {
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case NL80211_TDLS_ENABLE_LINK:
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rcu_read_lock();
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sta = sta_info_get(sdata, peer);
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if (!sta) {
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rcu_read_unlock();
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return -ENOLINK;
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}
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set_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH);
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rcu_read_unlock();
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break;
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case NL80211_TDLS_DISABLE_LINK:
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return sta_info_destroy_addr(sdata, peer);
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case NL80211_TDLS_TEARDOWN:
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case NL80211_TDLS_SETUP:
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case NL80211_TDLS_DISCOVERY_REQ:
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/* We don't support in-driver setup/teardown/discovery */
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return -ENOTSUPP;
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default:
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return -ENOTSUPP;
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}
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return 0;
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}
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