mac80211: factor out station lookup from ieee80211_build_hdr()
In order to look up the RA station earlier to implement a TX fastpath, factor out the lookup from ieee80211_build_hdr(). To always have a valid station pointer, also move some of the checks into the new function. Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Johannes Berg
Родитель
527871d720
Коммит
97ffe75791
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@ -1789,6 +1789,91 @@ fail:
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return NETDEV_TX_OK; /* meaning, we dealt with the skb */
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}
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static inline bool ieee80211_is_tdls_setup(struct sk_buff *skb)
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{
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u16 ethertype = (skb->data[12] << 8) | skb->data[13];
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return ethertype == ETH_P_TDLS &&
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skb->len > 14 &&
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skb->data[14] == WLAN_TDLS_SNAP_RFTYPE;
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}
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static int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data *sdata,
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struct sk_buff *skb,
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struct sta_info **sta_out)
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{
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struct sta_info *sta;
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switch (sdata->vif.type) {
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case NL80211_IFTYPE_AP_VLAN:
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sta = rcu_dereference(sdata->u.vlan.sta);
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if (sta) {
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*sta_out = sta;
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return 0;
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} else if (sdata->wdev.use_4addr) {
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return -ENOLINK;
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}
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/* fall through */
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case NL80211_IFTYPE_AP:
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case NL80211_IFTYPE_OCB:
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case NL80211_IFTYPE_ADHOC:
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if (is_multicast_ether_addr(skb->data)) {
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*sta_out = ERR_PTR(-ENOENT);
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return 0;
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}
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sta = sta_info_get_bss(sdata, skb->data);
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break;
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case NL80211_IFTYPE_WDS:
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sta = sta_info_get(sdata, sdata->u.wds.remote_addr);
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break;
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#ifdef CONFIG_MAC80211_MESH
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case NL80211_IFTYPE_MESH_POINT:
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/* determined much later */
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*sta_out = NULL;
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return 0;
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#endif
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case NL80211_IFTYPE_STATION:
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if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
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sta = sta_info_get(sdata, skb->data);
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if (sta) {
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bool tdls_peer, tdls_auth;
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tdls_peer = test_sta_flag(sta,
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WLAN_STA_TDLS_PEER);
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tdls_auth = test_sta_flag(sta,
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WLAN_STA_TDLS_PEER_AUTH);
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if (tdls_peer && tdls_auth) {
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*sta_out = sta;
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return 0;
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}
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/*
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* TDLS link during setup - throw out frames to
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* peer. Allow TDLS-setup frames to unauthorized
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* peers for the special case of a link teardown
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* after a TDLS sta is removed due to being
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* unreachable.
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*/
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if (tdls_peer && !tdls_auth &&
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!ieee80211_is_tdls_setup(skb))
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return -EINVAL;
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}
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}
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sta = sta_info_get(sdata, sdata->u.mgd.bssid);
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if (!sta)
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return -ENOLINK;
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break;
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default:
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return -EINVAL;
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}
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*sta_out = sta ?: ERR_PTR(-ENOENT);
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return 0;
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}
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/**
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* ieee80211_build_hdr - build 802.11 header in the given frame
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* @sdata: virtual interface to build the header for
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@ -1809,7 +1894,7 @@ fail:
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*/
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static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata,
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struct sk_buff *skb, u32 info_flags,
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struct sta_info **sta_out)
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struct sta_info *sta)
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{
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struct ieee80211_local *local = sdata->local;
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struct ieee80211_tx_info *info;
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@ -1822,17 +1907,18 @@ static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata,
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const u8 *encaps_data;
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int encaps_len, skip_header_bytes;
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int nh_pos, h_pos;
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struct sta_info *sta = NULL;
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bool wme_sta = false, authorized = false, tdls_auth = false;
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bool tdls_peer = false, tdls_setup_frame = false;
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bool wme_sta = false, authorized = false;
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bool tdls_peer;
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bool multicast;
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bool have_station = false;
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u16 info_id = 0;
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struct ieee80211_chanctx_conf *chanctx_conf;
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struct ieee80211_sub_if_data *ap_sdata;
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enum ieee80211_band band;
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int ret;
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if (IS_ERR(sta))
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sta = NULL;
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/* convert Ethernet header to proper 802.11 header (based on
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* operation mode) */
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ethertype = (skb->data[12] << 8) | skb->data[13];
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@ -1840,8 +1926,7 @@ static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata,
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switch (sdata->vif.type) {
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case NL80211_IFTYPE_AP_VLAN:
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sta = rcu_dereference(sdata->u.vlan.sta);
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if (sta) {
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if (sdata->wdev.use_4addr) {
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fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
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/* RA TA DA SA */
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memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN);
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@ -1851,11 +1936,6 @@ static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata,
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hdrlen = 30;
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authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
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wme_sta = sta->sta.wme;
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have_station = true;
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*sta_out = sta;
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} else if (sdata->wdev.use_4addr) {
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ret = -ENOLINK;
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goto free;
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}
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ap_sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
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u.ap);
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@ -1865,7 +1945,7 @@ static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata,
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goto free;
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}
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band = chanctx_conf->def.chan->band;
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if (sta)
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if (sdata->wdev.use_4addr)
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break;
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/* fall through */
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case NL80211_IFTYPE_AP:
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@ -1969,44 +2049,15 @@ static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata,
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break;
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#endif
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case NL80211_IFTYPE_STATION:
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if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
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sta = sta_info_get(sdata, skb->data);
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if (sta) {
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tdls_peer = test_sta_flag(sta,
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WLAN_STA_TDLS_PEER);
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tdls_auth = test_sta_flag(sta,
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WLAN_STA_TDLS_PEER_AUTH);
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}
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/* we already did checks when looking up the RA STA */
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tdls_peer = test_sta_flag(sta, WLAN_STA_TDLS_PEER);
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if (tdls_peer)
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tdls_setup_frame =
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ethertype == ETH_P_TDLS &&
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skb->len > 14 &&
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skb->data[14] == WLAN_TDLS_SNAP_RFTYPE;
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}
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/*
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* TDLS link during setup - throw out frames to peer. We allow
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* TDLS-setup frames to unauthorized peers for the special case
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* of a link teardown after a TDLS sta is removed due to being
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* unreachable.
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*/
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if (tdls_peer && !tdls_auth && !tdls_setup_frame) {
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ret = -EINVAL;
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goto free;
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}
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/* send direct packets to authorized TDLS peers */
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if (tdls_peer && tdls_auth) {
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if (tdls_peer) {
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/* DA SA BSSID */
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memcpy(hdr.addr1, skb->data, ETH_ALEN);
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memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
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memcpy(hdr.addr3, sdata->u.mgd.bssid, ETH_ALEN);
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hdrlen = 24;
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have_station = true;
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authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
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wme_sta = sta->sta.wme;
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*sta_out = sta;
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} else if (sdata->u.mgd.use_4addr &&
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cpu_to_be16(ethertype) != sdata->control_port_protocol) {
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fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
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@ -2063,30 +2114,16 @@ static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata,
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goto free;
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}
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/*
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* There's no need to try to look up the destination station
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* if it is a multicast address. In mesh, there's no need to
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* look up the station at all as it always must be QoS capable
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* and mesh mode checks authorization later.
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*/
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multicast = is_multicast_ether_addr(hdr.addr1);
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if (multicast) {
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*sta_out = ERR_PTR(-ENOENT);
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} else if (!have_station && !ieee80211_vif_is_mesh(&sdata->vif)) {
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if (sdata->control_port_protocol == skb->protocol)
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sta = sta_info_get_bss(sdata, hdr.addr1);
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else
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sta = sta_info_get(sdata, hdr.addr1);
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if (sta) {
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authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
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wme_sta = sta->sta.wme;
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}
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*sta_out = sta ?: ERR_PTR(-ENOENT);
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}
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/* For mesh, the use of the QoS header is mandatory */
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if (ieee80211_vif_is_mesh(&sdata->vif))
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/* sta is always NULL for mesh */
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if (sta) {
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authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
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wme_sta = sta->sta.wme;
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} else if (ieee80211_vif_is_mesh(&sdata->vif)) {
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/* For mesh, the use of the QoS header is mandatory */
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wme_sta = true;
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}
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/* receiver does QoS (which also means we do) use it */
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if (wme_sta) {
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@ -2259,7 +2296,7 @@ void __ieee80211_subif_start_xmit(struct sk_buff *skb,
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u32 info_flags)
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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 sta_info *sta = NULL;
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struct sta_info *sta;
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if (unlikely(skb->len < ETH_HLEN)) {
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kfree_skb(skb);
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@ -2268,7 +2305,12 @@ void __ieee80211_subif_start_xmit(struct sk_buff *skb,
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rcu_read_lock();
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skb = ieee80211_build_hdr(sdata, skb, info_flags, &sta);
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if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) {
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kfree_skb(skb);
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goto out;
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}
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skb = ieee80211_build_hdr(sdata, skb, info_flags, sta);
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if (IS_ERR(skb))
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goto out;
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@ -2304,11 +2346,17 @@ ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata,
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.local = sdata->local,
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.sdata = sdata,
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};
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struct sta_info *sta_ignore;
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struct sta_info *sta;
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rcu_read_lock();
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skb = ieee80211_build_hdr(sdata, skb, info_flags, &sta_ignore);
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if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) {
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kfree_skb(skb);
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skb = ERR_PTR(-EINVAL);
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goto out;
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}
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skb = ieee80211_build_hdr(sdata, skb, info_flags, sta);
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if (IS_ERR(skb))
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goto out;
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