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https://git.hardenedbsd.org/hardenedbsd/HardenedBSD.git
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[net80211] create a helper function to calculate the station facing VHT capabilities.
This is needed for two reasons: * Drivers will need to know what the negotiated set of VHT capabilities and rates are in order to configure (and reconfigure for opmode/chanwidth changes) how to speak to a given peer; and * Because some vendors are "special", we should be careful in what we announce to them during peer association. This isn't the complete solution, as I still need to make sure that when sending out probe requests before we know what we want, we don't limit the capabilities being announced. This is important for IBSS/mesh work later on as probe request/response exchanges are the first hint at what a peer supports. I'll look at adding that to the API soon.
This commit is contained in:
Adrian Chadd
parent
d37cece2b0
commit
791be271f1
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=311855
@ -70,6 +70,15 @@ __FBSDID("$FreeBSD$");
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frm += 4; \
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} while (0)
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/*
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* Immediate TODO:
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*
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* + handle WLAN_ACTION_VHT_OPMODE_NOTIF and other VHT action frames
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* + ensure vhtinfo/vhtcap parameters correctly use the negotiated
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* capabilities and ratesets
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* + group ID management operation
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*/
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/*
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* XXX TODO: handle WLAN_ACTION_VHT_OPMODE_NOTIF
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*
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@ -153,9 +162,9 @@ ieee80211_vht_announce(struct ieee80211com *ic)
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/* Channel width */
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ic_printf(ic, "[VHT] Channel Widths: 20MHz, 40MHz, 80MHz");
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if (ic->ic_vhtcaps & IEEE80211_VHTCAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ)
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if (MS(ic->ic_vhtcaps, IEEE80211_VHTCAP_SUPP_CHAN_WIDTH_MASK) == 2)
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printf(" 80+80MHz");
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if (ic->ic_vhtcaps & IEEE80211_VHTCAP_SUPP_CHAN_WIDTH_160MHZ)
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if (MS(ic->ic_vhtcaps, IEEE80211_VHTCAP_SUPP_CHAN_WIDTH_MASK) >= 1)
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printf(" 160MHz");
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printf("\n");
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@ -280,10 +289,342 @@ ieee80211_vht_node_leave(struct ieee80211_node *ni)
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"%s: called", __func__);
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}
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/*
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* Calculate the VHTCAP IE for a given node.
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*
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* This includes calculating the capability intersection based on the
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* current operating mode and intersection of the TX/RX MCS maps.
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*
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* The standard only makes it clear about MCS rate negotiation
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* and MCS basic rates (which must be a subset of the general
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* negotiated rates). It doesn't make it clear that the AP should
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* figure out the minimum functional overlap with the STA and
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* support that.
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*
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* Note: this is in host order, not in 802.11 endian order.
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*
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* TODO: ensure I re-read 9.7.11 Rate Selection for VHT STAs.
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*
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* TODO: investigate what we should negotiate for MU-MIMO beamforming
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* options.
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*
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* opmode is '1' for "vhtcap as if I'm a STA", 0 otherwise.
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*/
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void
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ieee80211_vht_get_vhtcap_ie(struct ieee80211_node *ni,
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struct ieee80211_ie_vhtcap *vhtcap, int opmode)
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{
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struct ieee80211vap *vap = ni->ni_vap;
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// struct ieee80211com *ic = vap->iv_ic;
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uint32_t val, val1, val2;
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uint32_t new_vhtcap;
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int i;
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vhtcap->ie = IEEE80211_ELEMID_VHT_CAP;
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vhtcap->len = sizeof(struct ieee80211_ie_vhtcap) - 2;
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/*
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* Capabilities - it depends on whether we are a station
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* or not.
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*/
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new_vhtcap = 0;
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/*
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* Station - use our desired configuration based on
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* local config, local device bits and the already-learnt
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* vhtcap/vhtinfo IE in the node.
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*/
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/* Limit MPDU size to the smaller of the two */
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val2 = val1 = MS(vap->iv_vhtcaps, IEEE80211_VHTCAP_MAX_MPDU_MASK);
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if (opmode == 1) {
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val2 = MS(ni->ni_vhtcap, IEEE80211_VHTCAP_MAX_MPDU_MASK);
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}
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val = MIN(val1, val2);
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new_vhtcap |= SM(val, IEEE80211_VHTCAP_MAX_MPDU_MASK);
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/* Limit supp channel config */
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val2 = val1 = MS(vap->iv_vhtcaps,
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IEEE80211_VHTCAP_SUPP_CHAN_WIDTH_MASK);
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if (opmode == 1) {
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val2 = MS(ni->ni_vhtcap,
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IEEE80211_VHTCAP_SUPP_CHAN_WIDTH_MASK);
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}
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if ((val2 == 2) &&
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((vap->iv_flags_vht & IEEE80211_FVHT_USEVHT80P80) == 0))
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val2 = 1;
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if ((val2 == 1) &&
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((vap->iv_flags_vht & IEEE80211_FVHT_USEVHT160) == 0))
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val2 = 0;
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val = MIN(val1, val2);
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new_vhtcap |= SM(val, IEEE80211_VHTCAP_SUPP_CHAN_WIDTH_MASK);
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/* RX LDPC */
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val2 = val1 = MS(vap->iv_vhtcaps, IEEE80211_VHTCAP_RXLDPC);
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if (opmode == 1) {
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val2 = MS(ni->ni_vhtcap, IEEE80211_VHTCAP_RXLDPC);
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}
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val = MIN(val1, val2);
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new_vhtcap |= SM(val, IEEE80211_VHTCAP_RXLDPC);
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/* Short-GI 80 */
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val2 = val1 = MS(vap->iv_vhtcaps, IEEE80211_VHTCAP_SHORT_GI_80);
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if (opmode == 1) {
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val2 = MS(ni->ni_vhtcap, IEEE80211_VHTCAP_SHORT_GI_80);
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}
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val = MIN(val1, val2);
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new_vhtcap |= SM(val, IEEE80211_VHTCAP_SHORT_GI_80);
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/* Short-GI 160 */
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val2 = val1 = MS(vap->iv_vhtcaps, IEEE80211_VHTCAP_SHORT_GI_160);
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if (opmode == 1) {
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val2 = MS(ni->ni_vhtcap, IEEE80211_VHTCAP_SHORT_GI_160);
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}
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val = MIN(val1, val2);
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new_vhtcap |= SM(val, IEEE80211_VHTCAP_SHORT_GI_160);
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/*
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* STBC is slightly more complicated.
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*
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* In non-STA mode, we just announce our capabilities and that
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* is that.
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*
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* In STA mode, we should calculate our capabilities based on
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* local capabilities /and/ what the remote says. So:
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*
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* + Only TX STBC if we support it and the remote supports RX STBC;
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* + Only announce RX STBC if we support it and the remote supports
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* TX STBC;
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* + RX STBC should be the minimum of local and remote RX STBC;
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*/
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/* TX STBC */
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val2 = val1 = MS(vap->iv_vhtcaps, IEEE80211_VHTCAP_TXSTBC);
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if (opmode == 1) {
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/* STA mode - enable it only if node RXSTBC is non-zero */
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val2 = !! MS(ni->ni_vhtcap, IEEE80211_VHTCAP_RXSTBC_MASK);
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}
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val = MIN(val1, val2);
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/* XXX For now, use the 11n config flag */
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if ((vap->iv_flags_ht & IEEE80211_FHT_STBC_TX) == 0)
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val = 0;
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new_vhtcap |= SM(val, IEEE80211_VHTCAP_TXSTBC);
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/* RX STBC1..4 */
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val2 = val1 = MS(vap->iv_vhtcaps, IEEE80211_VHTCAP_RXSTBC_MASK);
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if (opmode == 1) {
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/* STA mode - enable it only if node TXSTBC is non-zero */
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val2 = MS(ni->ni_vhtcap, IEEE80211_VHTCAP_TXSTBC);
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}
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val = MIN(val1, val2);
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/* XXX For now, use the 11n config flag */
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if ((vap->iv_flags_ht & IEEE80211_FHT_STBC_RX) == 0)
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val = 0;
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new_vhtcap |= SM(val, IEEE80211_VHTCAP_RXSTBC_MASK);
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/*
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* Finally - if RXSTBC is 0, then don't enable TXSTBC.
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* Strictly speaking a device can TXSTBC and not RXSTBC, but
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* it would be silly.
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*/
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if (val == 0)
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new_vhtcap &= ~IEEE80211_VHTCAP_TXSTBC;
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/*
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* Some of these fields require other fields to exist.
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* So before using it, the parent field needs to be checked
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* otherwise the overridden value may be wrong.
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*
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* For example, if SU beamformee is set to 0, then BF STS
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* needs to be 0.
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*/
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/* SU Beamformer capable */
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val2 = val1 = MS(vap->iv_vhtcaps,
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IEEE80211_VHTCAP_SU_BEAMFORMER_CAPABLE);
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if (opmode == 1) {
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val2 = MS(ni->ni_vhtcap,
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IEEE80211_VHTCAP_SU_BEAMFORMER_CAPABLE);
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}
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val = MIN(val1, val2);
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new_vhtcap |= SM(val, IEEE80211_VHTCAP_SU_BEAMFORMER_CAPABLE);
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/* SU Beamformee capable */
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val2 = val1 = MS(vap->iv_vhtcaps,
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IEEE80211_VHTCAP_SU_BEAMFORMEE_CAPABLE);
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if (opmode == 1) {
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val2 = MS(ni->ni_vhtcap,
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IEEE80211_VHTCAP_SU_BEAMFORMEE_CAPABLE);
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}
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val = MIN(val1, val2);
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new_vhtcap |= SM(val, IEEE80211_VHTCAP_SU_BEAMFORMEE_CAPABLE);
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/* Beamformee STS capability - only if SU beamformee capable */
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val2 = val1 = MS(vap->iv_vhtcaps, IEEE80211_VHTCAP_BEAMFORMEE_STS_MASK);
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if (opmode == 1) {
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val2 = MS(ni->ni_vhtcap, IEEE80211_VHTCAP_BEAMFORMEE_STS_MASK);
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}
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val = MIN(val1, val2);
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if ((new_vhtcap & IEEE80211_VHTCAP_SU_BEAMFORMEE_CAPABLE) == 0)
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val = 0;
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new_vhtcap |= SM(val, IEEE80211_VHTCAP_BEAMFORMEE_STS_MASK);
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/* Sounding dimensions - only if SU beamformer capable */
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val2 = val1 = MS(vap->iv_vhtcaps,
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IEEE80211_VHTCAP_SOUNDING_DIMENSIONS_MASK);
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if (opmode == 1)
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val2 = MS(ni->ni_vhtcap,
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IEEE80211_VHTCAP_SOUNDING_DIMENSIONS_MASK);
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val = MIN(val1, val2);
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if ((new_vhtcap & IEEE80211_VHTCAP_SU_BEAMFORMER_CAPABLE) == 0)
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val = 0;
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new_vhtcap |= SM(val, IEEE80211_VHTCAP_SOUNDING_DIMENSIONS_MASK);
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/*
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* MU Beamformer capable - only if SU BFF capable, MU BFF capable
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* and STA (not AP)
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*/
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val2 = val1 = MS(vap->iv_vhtcaps,
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IEEE80211_VHTCAP_MU_BEAMFORMER_CAPABLE);
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if (opmode == 1)
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val2 = MS(ni->ni_vhtcap,
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IEEE80211_VHTCAP_MU_BEAMFORMER_CAPABLE);
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val = MIN(val1, val2);
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if ((new_vhtcap & IEEE80211_VHTCAP_SU_BEAMFORMER_CAPABLE) == 0)
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val = 0;
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if (opmode != 1) /* Only enable for STA mode */
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val = 0;
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new_vhtcap |= SM(val, IEEE80211_VHTCAP_SU_BEAMFORMER_CAPABLE);
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/*
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* MU Beamformee capable - only if SU BFE capable, MU BFE capable
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* and AP (not STA)
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*/
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val2 = val1 = MS(vap->iv_vhtcaps,
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IEEE80211_VHTCAP_MU_BEAMFORMEE_CAPABLE);
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if (opmode == 1)
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val2 = MS(ni->ni_vhtcap,
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IEEE80211_VHTCAP_MU_BEAMFORMEE_CAPABLE);
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val = MIN(val1, val2);
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if ((new_vhtcap & IEEE80211_VHTCAP_SU_BEAMFORMEE_CAPABLE) == 0)
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val = 0;
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if (opmode != 0) /* Only enable for AP mode */
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val = 0;
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new_vhtcap |= SM(val, IEEE80211_VHTCAP_SU_BEAMFORMEE_CAPABLE);
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/* VHT TXOP PS */
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val2 = val1 = MS(vap->iv_vhtcaps, IEEE80211_VHTCAP_VHT_TXOP_PS);
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if (opmode == 1)
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val2 = MS(ni->ni_vhtcap, IEEE80211_VHTCAP_VHT_TXOP_PS);
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val = MIN(val1, val2);
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new_vhtcap |= SM(val, IEEE80211_VHTCAP_VHT_TXOP_PS);
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/* HTC_VHT */
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val2 = val1 = MS(vap->iv_vhtcaps, IEEE80211_VHTCAP_HTC_VHT);
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if (opmode == 1)
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val2 = MS(ni->ni_vhtcap, IEEE80211_VHTCAP_HTC_VHT);
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val = MIN(val1, val2);
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new_vhtcap |= SM(val, IEEE80211_VHTCAP_HTC_VHT);
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/* A-MPDU length max */
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/* XXX TODO: we need a userland config knob for this */
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val2 = val1 = MS(vap->iv_vhtcaps,
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IEEE80211_VHTCAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK);
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if (opmode == 1)
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val2 = MS(ni->ni_vhtcap,
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IEEE80211_VHTCAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK);
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val = MIN(val1, val2);
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new_vhtcap |= SM(val, IEEE80211_VHTCAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK);
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/*
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* Link adaptation is only valid if HTC-VHT capable is 1.
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* Otherwise, always set it to 0.
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*/
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val2 = val1 = MS(vap->iv_vhtcaps,
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IEEE80211_VHTCAP_VHT_LINK_ADAPTATION_VHT_MASK);
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if (opmode == 1)
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val2 = MS(ni->ni_vhtcap,
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IEEE80211_VHTCAP_VHT_LINK_ADAPTATION_VHT_MASK);
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val = MIN(val1, val2);
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if ((new_vhtcap & IEEE80211_VHTCAP_HTC_VHT) == 0)
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val = 0;
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new_vhtcap |= SM(val, IEEE80211_VHTCAP_VHT_LINK_ADAPTATION_VHT_MASK);
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/*
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* The following two options are 0 if the pattern may change, 1 if it
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* does not change. So, downgrade to the higher value.
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*/
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/* RX antenna pattern */
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val2 = val1 = MS(vap->iv_vhtcaps, IEEE80211_VHTCAP_RX_ANTENNA_PATTERN);
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if (opmode == 1)
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val2 = MS(ni->ni_vhtcap, IEEE80211_VHTCAP_RX_ANTENNA_PATTERN);
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val = MAX(val1, val2);
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new_vhtcap |= SM(val, IEEE80211_VHTCAP_RX_ANTENNA_PATTERN);
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/* TX antenna pattern */
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val2 = val1 = MS(vap->iv_vhtcaps, IEEE80211_VHTCAP_TX_ANTENNA_PATTERN);
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if (opmode == 1)
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val2 = MS(ni->ni_vhtcap, IEEE80211_VHTCAP_TX_ANTENNA_PATTERN);
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val = MAX(val1, val2);
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new_vhtcap |= SM(val, IEEE80211_VHTCAP_TX_ANTENNA_PATTERN);
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/*
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* MCS set - again, we announce what we want to use
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* based on configuration, device capabilities and
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* already-learnt vhtcap/vhtinfo IE information.
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*/
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/* MCS set - start with whatever the device supports */
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vhtcap->supp_mcs.rx_mcs_map = vap->iv_vht_mcsinfo.rx_mcs_map;
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vhtcap->supp_mcs.rx_highest = 0;
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vhtcap->supp_mcs.tx_mcs_map = vap->iv_vht_mcsinfo.tx_mcs_map;
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vhtcap->supp_mcs.tx_highest = 0;
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vhtcap->vht_cap_info = new_vhtcap;
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/*
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* Now, if we're a STA, mask off whatever the AP doesn't support.
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* Ie, we continue to state we can receive whatever we can do,
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* but we only announce that we will transmit rates that meet
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* the AP requirement.
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*
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* Note: 0 - MCS0..7; 1 - MCS0..8; 2 - MCS0..9; 3 = not supported.
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* We can't just use MIN() because '3' means "no", so special case it.
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*/
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if (opmode) {
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for (i = 0; i < 8; i++) {
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val1 = (vhtcap->supp_mcs.tx_mcs_map >> (i*2)) & 0x3;
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val2 = (ni->ni_vht_mcsinfo.tx_mcs_map >> (i*2)) & 0x3;
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val = MIN(val1, val2);
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if (val1 == 3 || val2 == 3)
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val = 3;
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vhtcap->supp_mcs.tx_mcs_map &= ~(0x3 << (i*2));
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vhtcap->supp_mcs.tx_mcs_map |= (val << (i*2));
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}
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}
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}
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/*
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* Add a VHTCAP field.
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*
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* If in station mode, we announce what we would like our
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* desired configuration to be.
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*
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* Else, we announce our capabilities based on our current
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* configuration.
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*/
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uint8_t *
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ieee80211_add_vhtcap(uint8_t *frm, struct ieee80211_node *ni)
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{
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uint32_t cap;
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struct ieee80211_ie_vhtcap vhtcap;
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int opmode;
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opmode = 0;
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if (ni->ni_vap->iv_opmode == IEEE80211_M_STA)
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opmode = 1;
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ieee80211_vht_get_vhtcap_ie(ni, &vhtcap, opmode);
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memset(frm, '\0', sizeof(struct ieee80211_ie_vhtcap));
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@ -291,27 +632,14 @@ ieee80211_add_vhtcap(uint8_t *frm, struct ieee80211_node *ni)
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frm[1] = sizeof(struct ieee80211_ie_vhtcap) - 2;
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frm += 2;
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/*
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* For now, don't do any configuration.
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* Just populate the node configuration.
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* We can worry about making it configurable later.
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*/
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cap = ni->ni_vhtcap;
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/*
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* XXX TODO: any capability changes required by
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* configuration.
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*/
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/* 32-bit VHT capability */
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ADDWORD(frm, cap);
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ADDWORD(frm, vhtcap.vht_cap_info);
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/* suppmcs */
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ADDSHORT(frm, ni->ni_vht_mcsinfo.rx_mcs_map);
|
||||
ADDSHORT(frm, ni->ni_vht_mcsinfo.rx_highest);
|
||||
ADDSHORT(frm, ni->ni_vht_mcsinfo.tx_mcs_map);
|
||||
ADDSHORT(frm, ni->ni_vht_mcsinfo.tx_highest);
|
||||
ADDSHORT(frm, vhtcap.supp_mcs.rx_mcs_map);
|
||||
ADDSHORT(frm, vhtcap.supp_mcs.rx_highest);
|
||||
ADDSHORT(frm, vhtcap.supp_mcs.tx_mcs_map);
|
||||
ADDSHORT(frm, vhtcap.supp_mcs.tx_highest);
|
||||
|
||||
return (frm);
|
||||
}
|
||||
@ -370,17 +698,6 @@ ieee80211_add_vhtinfo(uint8_t *frm, struct ieee80211_node *ni)
|
||||
frm[1] = sizeof(struct ieee80211_ie_vht_operation) - 2;
|
||||
frm += 2;
|
||||
|
||||
/*
|
||||
* XXX if it's a station, then see if we have a node
|
||||
* channel or ANYC. If it's ANYC then assume we're
|
||||
* scanning, and announce our capabilities.
|
||||
*
|
||||
* This should set the "20/40/80/160MHz wide config";
|
||||
* the 80/80 or 160MHz wide config is done in VHTCAP.
|
||||
*
|
||||
* Other modes - just limit it to the channel.
|
||||
*/
|
||||
|
||||
/* 8-bit chanwidth */
|
||||
*frm++ = ieee80211_vht_get_chwidth_ie(ni->ni_chan);
|
||||
|
||||
@ -475,3 +792,19 @@ ieee80211_vht_adjust_channel(struct ieee80211com *ic,
|
||||
#endif
|
||||
return (chan);
|
||||
}
|
||||
|
||||
/*
|
||||
* Calculate the VHT operation IE for a given node.
|
||||
*
|
||||
* This includes calculating the suitable channel width/parameters
|
||||
* and basic MCS set.
|
||||
*
|
||||
* TODO: ensure I read 9.7.11 Rate Selection for VHT STAs.
|
||||
* TODO: ensure I read 10.39.7 - BSS Basic VHT-MCS and NSS set operation.
|
||||
*/
|
||||
void
|
||||
ieee80211_vht_get_vhtinfo_ie(struct ieee80211_node *ni,
|
||||
struct ieee80211_ie_vht_operation *vhtop, int opmode)
|
||||
{
|
||||
printf("%s: called; TODO!\n", __func__);
|
||||
}
|
||||
|
||||
@ -60,4 +60,9 @@ struct ieee80211_channel *
|
||||
ieee80211_vht_adjust_channel(struct ieee80211com *,
|
||||
struct ieee80211_channel *, int);
|
||||
|
||||
void ieee80211_vht_get_vhtcap_ie(struct ieee80211_node *ni,
|
||||
struct ieee80211_ie_vhtcap *, int);
|
||||
void ieee80211_vht_get_vhtinfo_ie(struct ieee80211_node *ni,
|
||||
struct ieee80211_ie_vht_operation *, int);
|
||||
|
||||
#endif /* _NET80211_IEEE80211_VHT_H_ */
|
||||
|
||||
Loading…
Reference in New Issue
Block a user