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freebsd-nq/sys/net80211/ieee80211_ht.c
Sam Leffler 7f5144364e use the current left edge of the BA window when forming ADDBA request 
so an existing session is re-established with the correct seq#
2008-05-11 23:27:57 +00:00

2143 lines
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/*-
* Copyright (c) 2007-2008 Sam Leffler, Errno Consulting
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#ifdef __FreeBSD__
__FBSDID("$FreeBSD$");
#endif
/*
* IEEE 802.11n protocol support.
*/
#include "opt_inet.h"
#include "opt_wlan.h"
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/systm.h>
#include <sys/endian.h>
#include <sys/socket.h>
#include <net/if.h>
#include <net/if_media.h>
#include <net/ethernet.h>
#include <net80211/ieee80211_var.h>
#include <net80211/ieee80211_input.h>
/* define here, used throughout file */
#define MS(_v, _f) (((_v) & _f) >> _f##_S)
#define SM(_v, _f) (((_v) << _f##_S) & _f)
const struct ieee80211_mcs_rates ieee80211_htrates[16] = {
{ 13, 14, 27, 30 }, /* MCS 0 */
{ 26, 29, 54, 60 }, /* MCS 1 */
{ 39, 43, 81, 90 }, /* MCS 2 */
{ 52, 58, 108, 120 }, /* MCS 3 */
{ 78, 87, 162, 180 }, /* MCS 4 */
{ 104, 116, 216, 240 }, /* MCS 5 */
{ 117, 130, 243, 270 }, /* MCS 6 */
{ 130, 144, 270, 300 }, /* MCS 7 */
{ 26, 29, 54, 60 }, /* MCS 8 */
{ 52, 58, 108, 120 }, /* MCS 9 */
{ 78, 87, 162, 180 }, /* MCS 10 */
{ 104, 116, 216, 240 }, /* MCS 11 */
{ 156, 173, 324, 360 }, /* MCS 12 */
{ 208, 231, 432, 480 }, /* MCS 13 */
{ 234, 260, 486, 540 }, /* MCS 14 */
{ 260, 289, 540, 600 } /* MCS 15 */
};
static const struct ieee80211_htrateset ieee80211_rateset_11n =
{ 16, {
0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
10, 11, 12, 13, 14, 15 }
};
#ifdef IEEE80211_AMPDU_AGE
/* XXX public for sysctl hookup */
int ieee80211_ampdu_age = -1; /* threshold for ampdu reorder q (ms) */
#endif
int ieee80211_recv_bar_ena = 1;
int ieee80211_addba_timeout = -1; /* timeout waiting for ADDBA response */
int ieee80211_addba_backoff = -1; /* backoff after max ADDBA requests */
int ieee80211_addba_maxtries = 3; /* max ADDBA requests before backoff */
/*
* Setup HT parameters that depends on the clock frequency.
*/
static void
ieee80211_ht_setup(void)
{
#ifdef IEEE80211_AMPDU_AGE
ieee80211_ampdu_age = msecs_to_ticks(500);
#endif
ieee80211_addba_timeout = msecs_to_ticks(250);
ieee80211_addba_backoff = msecs_to_ticks(10*1000);
}
SYSINIT(wlan_ht, SI_SUB_DRIVERS, SI_ORDER_FIRST, ieee80211_ht_setup, NULL);
static int ieee80211_ampdu_enable(struct ieee80211_node *ni,
struct ieee80211_tx_ampdu *tap);
static int ieee80211_addba_request(struct ieee80211_node *ni,
struct ieee80211_tx_ampdu *tap,
int dialogtoken, int baparamset, int batimeout);
static int ieee80211_addba_response(struct ieee80211_node *ni,
struct ieee80211_tx_ampdu *tap,
int code, int baparamset, int batimeout);
static void ieee80211_addba_stop(struct ieee80211_node *ni,
struct ieee80211_tx_ampdu *tap);
static void ieee80211_aggr_recv_action(struct ieee80211_node *ni,
const uint8_t *frm, const uint8_t *efrm);
void
ieee80211_ht_attach(struct ieee80211com *ic)
{
/* setup default aggregation policy */
ic->ic_recv_action = ieee80211_aggr_recv_action;
ic->ic_send_action = ieee80211_send_action;
ic->ic_ampdu_enable = ieee80211_ampdu_enable;
ic->ic_addba_request = ieee80211_addba_request;
ic->ic_addba_response = ieee80211_addba_response;
ic->ic_addba_stop = ieee80211_addba_stop;
ic->ic_htprotmode = IEEE80211_PROT_RTSCTS;
ic->ic_curhtprotmode = IEEE80211_HTINFO_OPMODE_PURE;
}
void
ieee80211_ht_detach(struct ieee80211com *ic)
{
}
void
ieee80211_ht_vattach(struct ieee80211vap *vap)
{
/* driver can override defaults */
vap->iv_ampdu_rxmax = IEEE80211_HTCAP_MAXRXAMPDU_8K;
vap->iv_ampdu_density = IEEE80211_HTCAP_MPDUDENSITY_NA;
vap->iv_ampdu_limit = vap->iv_ampdu_rxmax;
vap->iv_amsdu_limit = vap->iv_htcaps & IEEE80211_HTCAP_MAXAMSDU;
/* tx aggregation traffic thresholds */
vap->iv_ampdu_mintraffic[WME_AC_BK] = 128;
vap->iv_ampdu_mintraffic[WME_AC_BE] = 64;
vap->iv_ampdu_mintraffic[WME_AC_VO] = 32;
vap->iv_ampdu_mintraffic[WME_AC_VI] = 32;
if (vap->iv_htcaps & IEEE80211_HTC_HT) {
/*
* Device is HT capable; enable all HT-related
* facilities by default.
* XXX these choices may be too aggressive.
*/
vap->iv_flags_ext |= IEEE80211_FEXT_HT
| IEEE80211_FEXT_HTCOMPAT
;
if (vap->iv_htcaps & IEEE80211_HTCAP_SHORTGI20)
vap->iv_flags_ext |= IEEE80211_FEXT_SHORTGI20;
/* XXX infer from channel list? */
if (vap->iv_htcaps & IEEE80211_HTCAP_CHWIDTH40) {
vap->iv_flags_ext |= IEEE80211_FEXT_USEHT40;
if (vap->iv_htcaps & IEEE80211_HTCAP_SHORTGI40)
vap->iv_flags_ext |= IEEE80211_FEXT_SHORTGI40;
}
/* NB: A-MPDU and A-MSDU rx are mandated, these are tx only */
vap->iv_flags_ext |= IEEE80211_FEXT_AMPDU_RX;
if (vap->iv_htcaps & IEEE80211_HTC_AMPDU)
vap->iv_flags_ext |= IEEE80211_FEXT_AMPDU_TX;
vap->iv_flags_ext |= IEEE80211_FEXT_AMSDU_RX;
if (vap->iv_htcaps & IEEE80211_HTC_AMSDU)
vap->iv_flags_ext |= IEEE80211_FEXT_AMSDU_TX;
}
/* NB: disable default legacy WDS, too many issues right now */
if (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY)
vap->iv_flags_ext &= ~IEEE80211_FEXT_HT;
}
void
ieee80211_ht_vdetach(struct ieee80211vap *vap)
{
}
static void
ht_announce(struct ieee80211com *ic, int mode,
const struct ieee80211_htrateset *rs)
{
struct ifnet *ifp = ic->ic_ifp;
int i, rate, mword;
if_printf(ifp, "%s MCS: ", ieee80211_phymode_name[mode]);
for (i = 0; i < rs->rs_nrates; i++) {
mword = ieee80211_rate2media(ic,
rs->rs_rates[i] | IEEE80211_RATE_MCS, mode);
if (IFM_SUBTYPE(mword) != IFM_IEEE80211_MCS)
continue;
rate = ieee80211_htrates[rs->rs_rates[i]].ht40_rate_400ns;
printf("%s%d%sMbps", (i != 0 ? " " : ""),
rate / 2, ((rate & 0x1) != 0 ? ".5" : ""));
}
printf("\n");
}
void
ieee80211_ht_announce(struct ieee80211com *ic)
{
if (isset(ic->ic_modecaps, IEEE80211_MODE_11NA))
ht_announce(ic, IEEE80211_MODE_11NA, &ieee80211_rateset_11n);
if (isset(ic->ic_modecaps, IEEE80211_MODE_11NG))
ht_announce(ic, IEEE80211_MODE_11NG, &ieee80211_rateset_11n);
}
const struct ieee80211_htrateset *
ieee80211_get_suphtrates(struct ieee80211com *ic,
const struct ieee80211_channel *c)
{
return &ieee80211_rateset_11n;
}
/*
* Receive processing.
*/
/*
* Decap the encapsulated A-MSDU frames and dispatch all but
* the last for delivery. The last frame is returned for
* delivery via the normal path.
*/
struct mbuf *
ieee80211_decap_amsdu(struct ieee80211_node *ni, struct mbuf *m)
{
struct ieee80211vap *vap = ni->ni_vap;
int framelen;
struct mbuf *n;
/* discard 802.3 header inserted by ieee80211_decap */
m_adj(m, sizeof(struct ether_header));
vap->iv_stats.is_amsdu_decap++;
for (;;) {
/*
* Decap the first frame, bust it apart from the
* remainder and deliver. We leave the last frame
* delivery to the caller (for consistency with other
* code paths, could also do it here).
*/
m = ieee80211_decap1(m, &framelen);
if (m == NULL) {
IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
ni->ni_macaddr, "a-msdu", "%s", "decap failed");
vap->iv_stats.is_amsdu_tooshort++;
return NULL;
}
if (m->m_pkthdr.len == framelen)
break;
n = m_split(m, framelen, M_NOWAIT);
if (n == NULL) {
IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
ni->ni_macaddr, "a-msdu",
"%s", "unable to split encapsulated frames");
vap->iv_stats.is_amsdu_split++;
m_freem(m); /* NB: must reclaim */
return NULL;
}
vap->iv_deliver_data(vap, ni, m);
/*
* Remove frame contents; each intermediate frame
* is required to be aligned to a 4-byte boundary.
*/
m = n;
m_adj(m, roundup2(framelen, 4) - framelen); /* padding */
}
return m; /* last delivered by caller */
}
/*
* Purge all frames in the A-MPDU re-order queue.
*/
static void
ampdu_rx_purge(struct ieee80211_rx_ampdu *rap)
{
struct mbuf *m;
int i;
for (i = 0; i < rap->rxa_wnd; i++) {
m = rap->rxa_m[i];
if (m != NULL) {
rap->rxa_m[i] = NULL;
rap->rxa_qbytes -= m->m_pkthdr.len;
m_freem(m);
if (--rap->rxa_qframes == 0)
break;
}
}
KASSERT(rap->rxa_qbytes == 0 && rap->rxa_qframes == 0,
("lost %u data, %u frames on ampdu rx q",
rap->rxa_qbytes, rap->rxa_qframes));
}
/*
* Start A-MPDU rx/re-order processing for the specified TID.
*/
static void
ampdu_rx_start(struct ieee80211_rx_ampdu *rap, int bufsiz, int start)
{
if (rap->rxa_flags & IEEE80211_AGGR_RUNNING) {
/*
* AMPDU previously setup and not terminated with a DELBA,
* flush the reorder q's in case anything remains.
*/
ampdu_rx_purge(rap);
}
memset(rap, 0, sizeof(*rap));
rap->rxa_wnd = (bufsiz == 0) ?
IEEE80211_AGGR_BAWMAX : min(bufsiz, IEEE80211_AGGR_BAWMAX);
rap->rxa_start = start;
rap->rxa_flags |= IEEE80211_AGGR_RUNNING | IEEE80211_AGGR_XCHGPEND;
}
/*
* Stop A-MPDU rx processing for the specified TID.
*/
static void
ampdu_rx_stop(struct ieee80211_rx_ampdu *rap)
{
ampdu_rx_purge(rap);
rap->rxa_flags &= ~(IEEE80211_AGGR_RUNNING | IEEE80211_AGGR_XCHGPEND);
}
/*
* Dispatch a frame from the A-MPDU reorder queue. The
* frame is fed back into ieee80211_input marked with an
* M_AMPDU flag so it doesn't come back to us (it also
* permits ieee80211_input to optimize re-processing).
*/
static __inline void
ampdu_dispatch(struct ieee80211_node *ni, struct mbuf *m)
{
m->m_flags |= M_AMPDU; /* bypass normal processing */
/* NB: rssi, noise, and rstamp are ignored w/ M_AMPDU set */
(void) ieee80211_input(ni, m, 0, 0, 0);
}
/*
* Dispatch as many frames as possible from the re-order queue.
* Frames will always be "at the front"; we process all frames
* up to the first empty slot in the window. On completion we
* cleanup state if there are still pending frames in the current
* BA window. We assume the frame at slot 0 is already handled
* by the caller; we always start at slot 1.
*/
static void
ampdu_rx_dispatch(struct ieee80211_rx_ampdu *rap, struct ieee80211_node *ni)
{
struct ieee80211vap *vap = ni->ni_vap;
struct mbuf *m;
int i;
/* flush run of frames */
for (i = 1; i < rap->rxa_wnd; i++) {
m = rap->rxa_m[i];
if (m == NULL)
break;
rap->rxa_m[i] = NULL;
rap->rxa_qbytes -= m->m_pkthdr.len;
rap->rxa_qframes--;
ampdu_dispatch(ni, m);
}
/*
* If frames remain, copy the mbuf pointers down so
* they correspond to the offsets in the new window.
*/
if (rap->rxa_qframes != 0) {
int n = rap->rxa_qframes, j;
for (j = i+1; j < rap->rxa_wnd; j++) {
if (rap->rxa_m[j] != NULL) {
rap->rxa_m[j-i] = rap->rxa_m[j];
rap->rxa_m[j] = NULL;
if (--n == 0)
break;
}
}
KASSERT(n == 0, ("lost %d frames", n));
vap->iv_stats.is_ampdu_rx_copy += rap->rxa_qframes;
}
/*
* Adjust the start of the BA window to
* reflect the frames just dispatched.
*/
rap->rxa_start = IEEE80211_SEQ_ADD(rap->rxa_start, i);
vap->iv_stats.is_ampdu_rx_oor += i;
}
#ifdef IEEE80211_AMPDU_AGE
/*
* Dispatch all frames in the A-MPDU re-order queue.
*/
static void
ampdu_rx_flush(struct ieee80211_node *ni, struct ieee80211_rx_ampdu *rap)
{
struct ieee80211vap *vap = ni->ni_vap;
struct mbuf *m;
int i;
for (i = 0; i < rap->rxa_wnd; i++) {
m = rap->rxa_m[i];
if (m == NULL)
continue;
rap->rxa_m[i] = NULL;
rap->rxa_qbytes -= m->m_pkthdr.len;
rap->rxa_qframes--;
vap->iv_stats.is_ampdu_rx_oor++;
ampdu_dispatch(ni, m);
if (rap->rxa_qframes == 0)
break;
}
}
#endif /* IEEE80211_AMPDU_AGE */
/*
* Dispatch all frames in the A-MPDU re-order queue
* preceding the specified sequence number. This logic
* handles window moves due to a received MSDU or BAR.
*/
static void
ampdu_rx_flush_upto(struct ieee80211_node *ni,
struct ieee80211_rx_ampdu *rap, ieee80211_seq winstart)
{
struct ieee80211vap *vap = ni->ni_vap;
struct mbuf *m;
ieee80211_seq seqno;
int i;
/*
* Flush any complete MSDU's with a sequence number lower
* than winstart. Gaps may exist. Note that we may actually
* dispatch frames past winstart if a run continues; this is
* an optimization that avoids having to do a separate pass
* to dispatch frames after moving the BA window start.
*/
seqno = rap->rxa_start;
for (i = 0; i < rap->rxa_wnd; i++) {
m = rap->rxa_m[i];
if (m != NULL) {
rap->rxa_m[i] = NULL;
rap->rxa_qbytes -= m->m_pkthdr.len;
rap->rxa_qframes--;
vap->iv_stats.is_ampdu_rx_oor++;
ampdu_dispatch(ni, m);
} else {
if (!IEEE80211_SEQ_BA_BEFORE(seqno, winstart))
break;
}
seqno = IEEE80211_SEQ_INC(seqno);
}
/*
* If frames remain, copy the mbuf pointers down so
* they correspond to the offsets in the new window.
*/
if (rap->rxa_qframes != 0) {
int n = rap->rxa_qframes, j;
/* NB: this loop assumes i > 0 and/or rxa_m[0] is NULL */
KASSERT(rap->rxa_m[0] == NULL,
("%s: BA window slot 0 occupied", __func__));
for (j = i+1; j < rap->rxa_wnd; j++) {
if (rap->rxa_m[j] != NULL) {
rap->rxa_m[j-i] = rap->rxa_m[j];
rap->rxa_m[j] = NULL;
if (--n == 0)
break;
}
}
KASSERT(n == 0, ("%s: lost %d frames, qframes %d off %d "
"BA win <%d:%d> winstart %d",
__func__, n, rap->rxa_qframes, i, rap->rxa_start,
IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1),
winstart));
vap->iv_stats.is_ampdu_rx_copy += rap->rxa_qframes;
}
/*
* Move the start of the BA window; we use the
* sequence number of the last MSDU that was
* passed up the stack+1 or winstart if stopped on
* a gap in the reorder buffer.
*/
rap->rxa_start = seqno;
}
/*
* Process a received QoS data frame for an HT station. Handle
* A-MPDU reordering: if this frame is received out of order
* and falls within the BA window hold onto it. Otherwise if
* this frame completes a run, flush any pending frames. We
* return 1 if the frame is consumed. A 0 is returned if
* the frame should be processed normally by the caller.
*/
int
ieee80211_ampdu_reorder(struct ieee80211_node *ni, struct mbuf *m)
{
#define IEEE80211_FC0_QOSDATA \
(IEEE80211_FC0_TYPE_DATA|IEEE80211_FC0_SUBTYPE_QOS|IEEE80211_FC0_VERSION_0)
#define PROCESS 0 /* caller should process frame */
#define CONSUMED 1 /* frame consumed, caller does nothing */
struct ieee80211vap *vap = ni->ni_vap;
struct ieee80211_qosframe *wh;
struct ieee80211_rx_ampdu *rap;
ieee80211_seq rxseq;
uint8_t tid;
int off;
KASSERT(ni->ni_flags & IEEE80211_NODE_HT, ("not an HT sta"));
/* NB: m_len known to be sufficient */
wh = mtod(m, struct ieee80211_qosframe *);
KASSERT(wh->i_fc[0] == IEEE80211_FC0_QOSDATA, ("not QoS data"));
if ((wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) == IEEE80211_FC1_DIR_DSTODS)
tid = ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0];
else
tid = wh->i_qos[0];
tid &= IEEE80211_QOS_TID;
rap = &ni->ni_rx_ampdu[tid];
if ((rap->rxa_flags & IEEE80211_AGGR_XCHGPEND) == 0) {
/*
* No ADDBA request yet, don't touch.
*/
return PROCESS;
}
rxseq = le16toh(*(uint16_t *)wh->i_seq) >> IEEE80211_SEQ_SEQ_SHIFT;
rap->rxa_nframes++;
again:
if (rxseq == rap->rxa_start) {
/*
* First frame in window.
*/
if (rap->rxa_qframes != 0) {
/*
* Dispatch as many packets as we can.
*/
KASSERT(rap->rxa_m[0] == NULL, ("unexpected dup"));
ampdu_dispatch(ni, m);
ampdu_rx_dispatch(rap, ni);
return CONSUMED;
} else {
/*
* In order; advance window and notify
* caller to dispatch directly.
*/
rap->rxa_start = IEEE80211_SEQ_INC(rxseq);
return PROCESS;
}
}
/*
* Frame is out of order; store if in the BA window.
*/
/* calculate offset in BA window */
off = IEEE80211_SEQ_SUB(rxseq, rap->rxa_start);
if (off < rap->rxa_wnd) {
/*
* Common case (hopefully): in the BA window.
* Sec 9.10.7.6 a) (D2.04 p.118 line 47)
*/
#ifdef IEEE80211_AMPDU_AGE
/*
* Check for frames sitting too long in the reorder queue.
* This should only ever happen if frames are not delivered
* without the sender otherwise notifying us (e.g. with a
* BAR to move the window). Typically this happens because
* of vendor bugs that cause the sequence number to jump.
* When this happens we get a gap in the reorder queue that
* leaves frame sitting on the queue until they get pushed
* out due to window moves. When the vendor does not send
* BAR this move only happens due to explicit packet sends
*
* NB: we only track the time of the oldest frame in the
* reorder q; this means that if we flush we might push
* frames that still "new"; if this happens then subsequent
* frames will result in BA window moves which cost something
* but is still better than a big throughput dip.
*/
if (rap->rxa_qframes != 0) {
/* XXX honor batimeout? */
if (ticks - rap->rxa_age > ieee80211_ampdu_age) {
/*
* Too long since we received the first
* frame; flush the reorder buffer.
*/
if (rap->rxa_qframes != 0) {
vap->iv_stats.is_ampdu_rx_age +=
rap->rxa_qframes;
ampdu_rx_flush(ni, rap);
}
rap->rxa_start = IEEE80211_SEQ_INC(rxseq);
return PROCESS;
}
} else {
/*
* First frame, start aging timer.
*/
rap->rxa_age = ticks;
}
#endif /* IEEE80211_AMPDU_AGE */
/* save packet */
if (rap->rxa_m[off] == NULL) {
rap->rxa_m[off] = m;
rap->rxa_qframes++;
rap->rxa_qbytes += m->m_pkthdr.len;
vap->iv_stats.is_ampdu_rx_reorder++;
} else {
IEEE80211_DISCARD_MAC(vap,
IEEE80211_MSG_INPUT | IEEE80211_MSG_11N,
ni->ni_macaddr, "a-mpdu duplicate",
"seqno %u tid %u BA win <%u:%u>",
rxseq, tid, rap->rxa_start,
IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1));
vap->iv_stats.is_rx_dup++;
IEEE80211_NODE_STAT(ni, rx_dup);
m_freem(m);
}
return CONSUMED;
}
if (off < IEEE80211_SEQ_BA_RANGE) {
/*
* Outside the BA window, but within range;
* flush the reorder q and move the window.
* Sec 9.10.7.6 b) (D2.04 p.118 line 60)
*/
IEEE80211_NOTE(vap, IEEE80211_MSG_11N, ni,
"move BA win <%u:%u> (%u frames) rxseq %u tid %u",
rap->rxa_start,
IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1),
rap->rxa_qframes, rxseq, tid);
vap->iv_stats.is_ampdu_rx_move++;
/*
* The spec says to flush frames up to but not including:
* WinStart_B = rxseq - rap->rxa_wnd + 1
* Then insert the frame or notify the caller to process
* it immediately. We can safely do this by just starting
* over again because we know the frame will now be within
* the BA window.
*/
/* NB: rxa_wnd known to be >0 */
ampdu_rx_flush_upto(ni, rap,
IEEE80211_SEQ_SUB(rxseq, rap->rxa_wnd-1));
goto again;
} else {
/*
* Outside the BA window and out of range; toss.
* Sec 9.10.7.6 c) (D2.04 p.119 line 16)
*/
IEEE80211_DISCARD_MAC(vap,
IEEE80211_MSG_INPUT | IEEE80211_MSG_11N, ni->ni_macaddr,
"MPDU", "BA win <%u:%u> (%u frames) rxseq %u tid %u%s",
rap->rxa_start,
IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1),
rap->rxa_qframes, rxseq, tid,
wh->i_fc[1] & IEEE80211_FC1_RETRY ? " (retransmit)" : "");
vap->iv_stats.is_ampdu_rx_drop++;
IEEE80211_NODE_STAT(ni, rx_drop);
m_freem(m);
return CONSUMED;
}
#undef CONSUMED
#undef PROCESS
#undef IEEE80211_FC0_QOSDATA
}
/*
* Process a BAR ctl frame. Dispatch all frames up to
* the sequence number of the frame. If this frame is
* out of range it's discarded.
*/
void
ieee80211_recv_bar(struct ieee80211_node *ni, struct mbuf *m0)
{
struct ieee80211vap *vap = ni->ni_vap;
struct ieee80211_frame_bar *wh;
struct ieee80211_rx_ampdu *rap;
ieee80211_seq rxseq;
int tid, off;
if (!ieee80211_recv_bar_ena) {
#if 0
IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_11N,
ni->ni_macaddr, "BAR", "%s", "processing disabled");
#endif
vap->iv_stats.is_ampdu_bar_bad++;
return;
}
wh = mtod(m0, struct ieee80211_frame_bar *);
/* XXX check basic BAR */
tid = MS(le16toh(wh->i_ctl), IEEE80211_BAR_TID);
rap = &ni->ni_rx_ampdu[tid];
if ((rap->rxa_flags & IEEE80211_AGGR_XCHGPEND) == 0) {
/*
* No ADDBA request yet, don't touch.
*/
IEEE80211_DISCARD_MAC(vap,
IEEE80211_MSG_INPUT | IEEE80211_MSG_11N,
ni->ni_macaddr, "BAR", "no BA stream, tid %u", tid);
vap->iv_stats.is_ampdu_bar_bad++;
return;
}
vap->iv_stats.is_ampdu_bar_rx++;
rxseq = le16toh(wh->i_seq) >> IEEE80211_SEQ_SEQ_SHIFT;
if (rxseq == rap->rxa_start)
return;
/* calculate offset in BA window */
off = IEEE80211_SEQ_SUB(rxseq, rap->rxa_start);
if (off < IEEE80211_SEQ_BA_RANGE) {
/*
* Flush the reorder q up to rxseq and move the window.
* Sec 9.10.7.6 a) (D2.04 p.119 line 22)
*/
IEEE80211_NOTE(vap, IEEE80211_MSG_11N, ni,
"BAR moves BA win <%u:%u> (%u frames) rxseq %u tid %u",
rap->rxa_start,
IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1),
rap->rxa_qframes, rxseq, tid);
vap->iv_stats.is_ampdu_bar_move++;
ampdu_rx_flush_upto(ni, rap, rxseq);
if (off >= rap->rxa_wnd) {
/*
* BAR specifies a window start to the right of BA
* window; we must move it explicitly since
* ampdu_rx_flush_upto will not.
*/
rap->rxa_start = rxseq;
}
} else {
/*
* Out of range; toss.
* Sec 9.10.7.6 b) (D2.04 p.119 line 41)
*/
IEEE80211_DISCARD_MAC(vap,
IEEE80211_MSG_INPUT | IEEE80211_MSG_11N, ni->ni_macaddr,
"BAR", "BA win <%u:%u> (%u frames) rxseq %u tid %u%s",
rap->rxa_start,
IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd-1),
rap->rxa_qframes, rxseq, tid,
wh->i_fc[1] & IEEE80211_FC1_RETRY ? " (retransmit)" : "");
vap->iv_stats.is_ampdu_bar_oow++;
IEEE80211_NODE_STAT(ni, rx_drop);
}
}
/*
* Setup HT-specific state in a node. Called only
* when HT use is negotiated so we don't do extra
* work for temporary and/or legacy sta's.
*/
void
ieee80211_ht_node_init(struct ieee80211_node *ni, const uint8_t *htcap)
{
struct ieee80211_tx_ampdu *tap;
int ac;
if (ni->ni_flags & IEEE80211_NODE_HT) {
/*
* Clean AMPDU state on re-associate. This handles the case
* where a station leaves w/o notifying us and then returns
* before node is reaped for inactivity.
*/
ieee80211_ht_node_cleanup(ni);
}
ieee80211_parse_htcap(ni, htcap);
for (ac = 0; ac < WME_NUM_AC; ac++) {
tap = &ni->ni_tx_ampdu[ac];
tap->txa_ac = ac;
/* NB: further initialization deferred */
}
ni->ni_flags |= IEEE80211_NODE_HT | IEEE80211_NODE_AMPDU;
}
/*
* Cleanup HT-specific state in a node. Called only
* when HT use has been marked.
*/
void
ieee80211_ht_node_cleanup(struct ieee80211_node *ni)
{
struct ieee80211com *ic = ni->ni_ic;
int i;
KASSERT(ni->ni_flags & IEEE80211_NODE_HT, ("not an HT node"));
/* XXX optimize this */
for (i = 0; i < WME_NUM_AC; i++) {
struct ieee80211_tx_ampdu *tap = &ni->ni_tx_ampdu[i];
if (tap->txa_flags & IEEE80211_AGGR_SETUP) {
/*
* Stop BA stream if setup so driver has a chance
* to reclaim any resources it might have allocated.
*/
ic->ic_addba_stop(ni, &ni->ni_tx_ampdu[i]);
IEEE80211_TAPQ_DESTROY(tap);
tap->txa_lastsample = 0;
tap->txa_avgpps = 0;
/* NB: clearing NAK means we may re-send ADDBA */
tap->txa_flags &=
~(IEEE80211_AGGR_SETUP | IEEE80211_AGGR_NAK);
}
}
for (i = 0; i < WME_NUM_TID; i++)
ampdu_rx_stop(&ni->ni_rx_ampdu[i]);
ni->ni_htcap = 0;
ni->ni_flags &= ~(IEEE80211_NODE_HT | IEEE80211_NODE_HTCOMPAT |
IEEE80211_NODE_AMPDU);
}
/*
* Age out HT resources for a station.
*/
void
ieee80211_ht_node_age(struct ieee80211_node *ni)
{
#ifdef IEEE80211_AMPDU_AGE
struct ieee80211vap *vap = ni->ni_vap;
uint8_t tid;
#endif
KASSERT(ni->ni_flags & IEEE80211_NODE_HT, ("not an HT sta"));
#ifdef IEEE80211_AMPDU_AGE
for (tid = 0; tid < WME_NUM_TID; tid++) {
struct ieee80211_rx_ampdu *rap;
rap = &ni->ni_rx_ampdu[tid];
if ((rap->rxa_flags & IEEE80211_AGGR_XCHGPEND) == 0)
continue;
if (rap->rxa_qframes == 0)
continue;
/*
* Check for frames sitting too long in the reorder queue.
* See above for more details on what's happening here.
*/
/* XXX honor batimeout? */
if (ticks - rap->rxa_age > ieee80211_ampdu_age) {
/*
* Too long since we received the first
* frame; flush the reorder buffer.
*/
vap->iv_stats.is_ampdu_rx_age += rap->rxa_qframes;
ampdu_rx_flush(ni, rap);
}
}
#endif /* IEEE80211_AMPDU_AGE */
}
static struct ieee80211_channel *
findhtchan(struct ieee80211com *ic, struct ieee80211_channel *c, int htflags)
{
return ieee80211_find_channel(ic, c->ic_freq,
(c->ic_flags &~ IEEE80211_CHAN_HT) | htflags);
}
/*
* Adjust a channel to be HT/non-HT according to the vap's configuration.
*/
struct ieee80211_channel *
ieee80211_ht_adjust_channel(struct ieee80211com *ic,
struct ieee80211_channel *chan, int flags)
{
struct ieee80211_channel *c;
if (flags & IEEE80211_FEXT_HT) {
/* promote to HT if possible */
if (flags & IEEE80211_FEXT_USEHT40) {
if (!IEEE80211_IS_CHAN_HT40(chan)) {
/* NB: arbitrarily pick ht40+ over ht40- */
c = findhtchan(ic, chan, IEEE80211_CHAN_HT40U);
if (c == NULL)
c = findhtchan(ic, chan,
IEEE80211_CHAN_HT40D);
if (c == NULL)
c = findhtchan(ic, chan,
IEEE80211_CHAN_HT20);
if (c != NULL)
chan = c;
}
} else if (!IEEE80211_IS_CHAN_HT20(chan)) {
c = findhtchan(ic, chan, IEEE80211_CHAN_HT20);
if (c != NULL)
chan = c;
}
} else if (IEEE80211_IS_CHAN_HT(chan)) {
/* demote to legacy, HT use is disabled */
c = ieee80211_find_channel(ic, chan->ic_freq,
chan->ic_flags &~ IEEE80211_CHAN_HT);
if (c != NULL)
chan = c;
}
return chan;
}
/*
* Setup HT-specific state for a legacy WDS peer.
*/
void
ieee80211_ht_wds_init(struct ieee80211_node *ni)
{
struct ieee80211vap *vap = ni->ni_vap;
struct ieee80211_tx_ampdu *tap;
int ac;
KASSERT(vap->iv_flags_ext & IEEE80211_FEXT_HT, ("no HT requested"));
/* XXX check scan cache in case peer has an ap and we have info */
/*
* If setup with a legacy channel; locate an HT channel.
* Otherwise if the inherited channel (from a companion
* AP) is suitable use it so we use the same location
* for the extension channel).
*/
ni->ni_chan = ieee80211_ht_adjust_channel(ni->ni_ic,
ni->ni_chan, ieee80211_htchanflags(ni->ni_chan));
ni->ni_htcap = 0;
if (vap->iv_flags_ext & IEEE80211_FEXT_SHORTGI20)
ni->ni_htcap |= IEEE80211_HTCAP_SHORTGI20;
if (IEEE80211_IS_CHAN_HT40(ni->ni_chan)) {
ni->ni_htcap |= IEEE80211_HTCAP_CHWIDTH40;
ni->ni_chw = 40;
if (IEEE80211_IS_CHAN_HT40U(ni->ni_chan))
ni->ni_ht2ndchan = IEEE80211_HTINFO_2NDCHAN_ABOVE;
else if (IEEE80211_IS_CHAN_HT40D(ni->ni_chan))
ni->ni_ht2ndchan = IEEE80211_HTINFO_2NDCHAN_BELOW;
if (vap->iv_flags_ext & IEEE80211_FEXT_SHORTGI40)
ni->ni_htcap |= IEEE80211_HTCAP_SHORTGI40;
} else {
ni->ni_chw = 20;
ni->ni_ht2ndchan = IEEE80211_HTINFO_2NDCHAN_NONE;
}
ni->ni_htctlchan = ni->ni_chan->ic_ieee;
ni->ni_htopmode = 0; /* XXX need protection state */
ni->ni_htstbc = 0; /* XXX need info */
for (ac = 0; ac < WME_NUM_AC; ac++) {
tap = &ni->ni_tx_ampdu[ac];
tap->txa_ac = ac;
}
/* NB: AMPDU tx/rx governed by IEEE80211_FEXT_AMPDU_{TX,RX} */
ni->ni_flags |= IEEE80211_NODE_HT | IEEE80211_NODE_AMPDU;
}
/*
* Notify hostap vaps of a change in the HTINFO ie.
*/
static void
htinfo_notify(struct ieee80211com *ic)
{
struct ieee80211vap *vap;
int first = 1;
IEEE80211_LOCK_ASSERT(ic);
TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) {
if (vap->iv_opmode != IEEE80211_M_HOSTAP)
continue;
if (first) {
IEEE80211_NOTE(vap,
IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N,
vap->iv_bss,
"HT bss occupancy change: %d sta, %d ht, "
"%d ht40%s, HT protmode now 0x%x"
, ic->ic_sta_assoc
, ic->ic_ht_sta_assoc
, ic->ic_ht40_sta_assoc
, (ic->ic_flags_ext & IEEE80211_FEXT_NONHT_PR) ?
", non-HT sta present" : ""
, ic->ic_curhtprotmode);
first = 0;
}
ieee80211_beacon_notify(vap, IEEE80211_BEACON_HTINFO);
}
}
/*
* Calculate HT protection mode from current
* state and handle updates.
*/
static void
htinfo_update(struct ieee80211com *ic)
{
uint8_t protmode;
if (ic->ic_sta_assoc != ic->ic_ht_sta_assoc) {
protmode = IEEE80211_HTINFO_OPMODE_MIXED
| IEEE80211_HTINFO_NONHT_PRESENT;
} else if (ic->ic_flags_ext & IEEE80211_FEXT_NONHT_PR) {
protmode = IEEE80211_HTINFO_OPMODE_PROTOPT
| IEEE80211_HTINFO_NONHT_PRESENT;
} else if (ic->ic_bsschan != IEEE80211_CHAN_ANYC &&
IEEE80211_IS_CHAN_HT40(ic->ic_bsschan) &&
ic->ic_sta_assoc != ic->ic_ht40_sta_assoc) {
protmode = IEEE80211_HTINFO_OPMODE_HT20PR;
} else {
protmode = IEEE80211_HTINFO_OPMODE_PURE;
}
if (protmode != ic->ic_curhtprotmode) {
ic->ic_curhtprotmode = protmode;
htinfo_notify(ic);
}
}
/*
* Handle an HT station joining a BSS.
*/
void
ieee80211_ht_node_join(struct ieee80211_node *ni)
{
struct ieee80211com *ic = ni->ni_ic;
IEEE80211_LOCK_ASSERT(ic);
if (ni->ni_flags & IEEE80211_NODE_HT) {
ic->ic_ht_sta_assoc++;
if (ni->ni_chw == 40)
ic->ic_ht40_sta_assoc++;
}
htinfo_update(ic);
}
/*
* Handle an HT station leaving a BSS.
*/
void
ieee80211_ht_node_leave(struct ieee80211_node *ni)
{
struct ieee80211com *ic = ni->ni_ic;
IEEE80211_LOCK_ASSERT(ic);
if (ni->ni_flags & IEEE80211_NODE_HT) {
ic->ic_ht_sta_assoc--;
if (ni->ni_chw == 40)
ic->ic_ht40_sta_assoc--;
}
htinfo_update(ic);
}
/*
* Public version of htinfo_update; used for processing
* beacon frames from overlapping bss.
*
* Caller can specify either IEEE80211_HTINFO_OPMODE_MIXED
* (on receipt of a beacon that advertises MIXED) or
* IEEE80211_HTINFO_OPMODE_PROTOPT (on receipt of a beacon
* from an overlapping legacy bss). We treat MIXED with
* a higher precedence than PROTOPT (i.e. we will not change
* change PROTOPT -> MIXED; only MIXED -> PROTOPT). This
* corresponds to how we handle things in htinfo_update.
*/
void
ieee80211_htprot_update(struct ieee80211com *ic, int protmode)
{
#define OPMODE(x) SM(x, IEEE80211_HTINFO_OPMODE)
if (protmode == ic->ic_curhtprotmode)
return;
if (OPMODE(ic->ic_curhtprotmode) == IEEE80211_HTINFO_OPMODE_MIXED &&
OPMODE(protmode) == IEEE80211_HTINFO_OPMODE_PROTOPT)
return;
/* track non-HT station presence */
KASSERT(protmode & IEEE80211_HTINFO_NONHT_PRESENT,
("missing NONHT_PRESENT"));
ic->ic_flags_ext |= IEEE80211_FEXT_NONHT_PR;
ic->ic_lastnonht = ticks;
/* push beacon update */
ic->ic_curhtprotmode = protmode;
htinfo_notify(ic);
#undef OPMODE
}
/*
* Time out presence of an overlapping bss with non-HT
* stations. When operating in hostap mode we listen for
* beacons from other stations and if we identify a non-HT
* station is present we update the opmode field of the
* HTINFO ie. To identify when all non-HT stations are
* gone we time out this condition.
*/
void
ieee80211_ht_timeout(struct ieee80211com *ic)
{
IEEE80211_LOCK_ASSERT(ic);
if ((ic->ic_flags_ext & IEEE80211_FEXT_NONHT_PR) &&
time_after(ticks, ic->ic_lastnonht + IEEE80211_NONHT_PRESENT_AGE)) {
#if 0
IEEE80211_NOTE(vap, IEEE80211_MSG_11N, ni,
"%s", "time out non-HT STA present on channel");
#endif
ic->ic_flags_ext &= ~IEEE80211_FEXT_NONHT_PR;
htinfo_update(ic);
}
}
/* unalligned little endian access */
#define LE_READ_2(p) \
((uint16_t) \
((((const uint8_t *)(p))[0] ) | \
(((const uint8_t *)(p))[1] << 8)))
/*
* Process an 802.11n HT capabilities ie.
*/
void
ieee80211_parse_htcap(struct ieee80211_node *ni, const uint8_t *ie)
{
struct ieee80211vap *vap = ni->ni_vap;
if (ie[0] == IEEE80211_ELEMID_VENDOR) {
/*
* Station used Vendor OUI ie to associate;
* mark the node so when we respond we'll use
* the Vendor OUI's and not the standard ie's.
*/
ni->ni_flags |= IEEE80211_NODE_HTCOMPAT;
ie += 4;
} else
ni->ni_flags &= ~IEEE80211_NODE_HTCOMPAT;
ni->ni_htcap = LE_READ_2(ie +
__offsetof(struct ieee80211_ie_htcap, hc_cap));
ni->ni_htparam = ie[__offsetof(struct ieee80211_ie_htcap, hc_param)];
/* XXX needed or will ieee80211_parse_htinfo always be called? */
ni->ni_chw = (ni->ni_htcap & IEEE80211_HTCAP_CHWIDTH40) &&
(vap->iv_flags_ext & IEEE80211_FEXT_USEHT40) ? 40 : 20;
}
/*
* Process an 802.11n HT info ie and update the node state.
* Note that we handle use this information to identify the
* correct channel (HT20, HT40+, HT40-, legacy). The caller
* is responsible for insuring any required channel change is
* done (e.g. in sta mode when parsing the contents of a
* beacon frame).
*/
void
ieee80211_parse_htinfo(struct ieee80211_node *ni, const uint8_t *ie)
{
struct ieee80211com *ic = ni->ni_ic;
struct ieee80211vap *vap = ni->ni_vap;
const struct ieee80211_ie_htinfo *htinfo;
struct ieee80211_channel *c;
uint16_t w;
int htflags, chanflags;
if (ie[0] == IEEE80211_ELEMID_VENDOR)
ie += 4;
htinfo = (const struct ieee80211_ie_htinfo *) ie;
ni->ni_htctlchan = htinfo->hi_ctrlchannel;
ni->ni_ht2ndchan = SM(htinfo->hi_byte1, IEEE80211_HTINFO_2NDCHAN);
w = LE_READ_2(&htinfo->hi_byte2);
ni->ni_htopmode = SM(w, IEEE80211_HTINFO_OPMODE);
w = LE_READ_2(&htinfo->hi_byte45);
ni->ni_htstbc = SM(w, IEEE80211_HTINFO_BASIC_STBCMCS);
/*
* Handle 11n channel switch. Use the received HT ie's to
* identify the right channel to use. If we cannot locate it
* in the channel table then fallback to legacy operation.
*/
/* NB: honor operating mode constraint */
htflags = (vap->iv_flags_ext & IEEE80211_FEXT_HT) ?
IEEE80211_CHAN_HT20 : 0;
if ((htinfo->hi_byte1 & IEEE80211_HTINFO_TXWIDTH_2040) &&
(vap->iv_flags_ext & IEEE80211_FEXT_USEHT40)) {
if (ni->ni_ht2ndchan == IEEE80211_HTINFO_2NDCHAN_ABOVE)
htflags = IEEE80211_CHAN_HT40U;
else if (ni->ni_ht2ndchan == IEEE80211_HTINFO_2NDCHAN_BELOW)
htflags = IEEE80211_CHAN_HT40D;
}
chanflags = (ni->ni_chan->ic_flags &~ IEEE80211_CHAN_HT) | htflags;
if (chanflags != ni->ni_chan->ic_flags) {
c = ieee80211_find_channel(ic, ni->ni_chan->ic_freq, chanflags);
if (c == NULL && (htflags & IEEE80211_CHAN_HT40)) {
/*
* No HT40 channel entry in our table; fall back
* to HT20 operation. This should not happen.
*/
c = findhtchan(ic, ni->ni_chan, IEEE80211_CHAN_HT20);
IEEE80211_NOTE(vap,
IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, ni,
"no HT40 channel (freq %u), falling back to HT20",
ni->ni_chan->ic_freq);
/* XXX stat */
}
if (c != NULL && c != ni->ni_chan) {
IEEE80211_NOTE(vap,
IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, ni,
"switch station to HT%d channel %u/0x%x",
IEEE80211_IS_CHAN_HT40(c) ? 40 : 20,
c->ic_freq, c->ic_flags);
ni->ni_chan = c;
}
/* NB: caller responsible for forcing any channel change */
}
/* update node's tx channel width */
ni->ni_chw = IEEE80211_IS_CHAN_HT40(ni->ni_chan)? 40 : 20;
}
/*
* Install received HT rate set by parsing the HT cap ie.
*/
int
ieee80211_setup_htrates(struct ieee80211_node *ni, const uint8_t *ie, int flags)
{
struct ieee80211vap *vap = ni->ni_vap;
const struct ieee80211_ie_htcap *htcap;
struct ieee80211_htrateset *rs;
int i;
rs = &ni->ni_htrates;
memset(rs, 0, sizeof(*rs));
if (ie != NULL) {
if (ie[0] == IEEE80211_ELEMID_VENDOR)
ie += 4;
htcap = (const struct ieee80211_ie_htcap *) ie;
for (i = 0; i < IEEE80211_HTRATE_MAXSIZE; i++) {
if (isclr(htcap->hc_mcsset, i))
continue;
if (rs->rs_nrates == IEEE80211_HTRATE_MAXSIZE) {
IEEE80211_NOTE(vap,
IEEE80211_MSG_XRATE | IEEE80211_MSG_11N, ni,
"WARNING, HT rate set too large; only "
"using %u rates", IEEE80211_HTRATE_MAXSIZE);
vap->iv_stats.is_rx_rstoobig++;
break;
}
rs->rs_rates[rs->rs_nrates++] = i;
}
}
return ieee80211_fix_rate(ni, (struct ieee80211_rateset *) rs, flags);
}
/*
* Mark rates in a node's HT rate set as basic according
* to the information in the supplied HT info ie.
*/
void
ieee80211_setup_basic_htrates(struct ieee80211_node *ni, const uint8_t *ie)
{
const struct ieee80211_ie_htinfo *htinfo;
struct ieee80211_htrateset *rs;
int i, j;
if (ie[0] == IEEE80211_ELEMID_VENDOR)
ie += 4;
htinfo = (const struct ieee80211_ie_htinfo *) ie;
rs = &ni->ni_htrates;
if (rs->rs_nrates == 0) {
IEEE80211_NOTE(ni->ni_vap,
IEEE80211_MSG_XRATE | IEEE80211_MSG_11N, ni,
"%s", "WARNING, empty HT rate set");
return;
}
for (i = 0; i < IEEE80211_HTRATE_MAXSIZE; i++) {
if (isclr(htinfo->hi_basicmcsset, i))
continue;
for (j = 0; j < rs->rs_nrates; j++)
if ((rs->rs_rates[j] & IEEE80211_RATE_VAL) == i)
rs->rs_rates[j] |= IEEE80211_RATE_BASIC;
}
}
static void
addba_timeout(void *arg)
{
struct ieee80211_tx_ampdu *tap = arg;
/* XXX ? */
tap->txa_flags &= ~IEEE80211_AGGR_XCHGPEND;
tap->txa_attempts++;
}
static void
addba_start_timeout(struct ieee80211_tx_ampdu *tap)
{
/* XXX use CALLOUT_PENDING instead? */
callout_reset(&tap->txa_timer, ieee80211_addba_timeout,
addba_timeout, tap);
tap->txa_flags |= IEEE80211_AGGR_XCHGPEND;
tap->txa_nextrequest = ticks + ieee80211_addba_timeout;
}
static void
addba_stop_timeout(struct ieee80211_tx_ampdu *tap)
{
/* XXX use CALLOUT_PENDING instead? */
if (tap->txa_flags & IEEE80211_AGGR_XCHGPEND) {
callout_stop(&tap->txa_timer);
tap->txa_flags &= ~IEEE80211_AGGR_XCHGPEND;
}
}
/*
* Default method for requesting A-MPDU tx aggregation.
* We setup the specified state block and start a timer
* to wait for an ADDBA response frame.
*/
static int
ieee80211_addba_request(struct ieee80211_node *ni,
struct ieee80211_tx_ampdu *tap,
int dialogtoken, int baparamset, int batimeout)
{
int bufsiz;
/* XXX locking */
tap->txa_token = dialogtoken;
tap->txa_flags |= IEEE80211_AGGR_IMMEDIATE;
tap->txa_start = tap->txa_seqstart = 0;
bufsiz = MS(baparamset, IEEE80211_BAPS_BUFSIZ);
tap->txa_wnd = (bufsiz == 0) ?
IEEE80211_AGGR_BAWMAX : min(bufsiz, IEEE80211_AGGR_BAWMAX);
addba_start_timeout(tap);
return 1;
}
/*
* Default method for processing an A-MPDU tx aggregation
* response. We shutdown any pending timer and update the
* state block according to the reply.
*/
static int
ieee80211_addba_response(struct ieee80211_node *ni,
struct ieee80211_tx_ampdu *tap,
int status, int baparamset, int batimeout)
{
int bufsiz;
/* XXX locking */
addba_stop_timeout(tap);
if (status == IEEE80211_STATUS_SUCCESS) {
bufsiz = MS(baparamset, IEEE80211_BAPS_BUFSIZ);
/* XXX override our request? */
tap->txa_wnd = (bufsiz == 0) ?
IEEE80211_AGGR_BAWMAX : min(bufsiz, IEEE80211_AGGR_BAWMAX);
tap->txa_flags |= IEEE80211_AGGR_RUNNING;
} else {
/* mark tid so we don't try again */
tap->txa_flags |= IEEE80211_AGGR_NAK;
}
return 1;
}
/*
* Default method for stopping A-MPDU tx aggregation.
* Any timer is cleared and we drain any pending frames.
*/
static void
ieee80211_addba_stop(struct ieee80211_node *ni, struct ieee80211_tx_ampdu *tap)
{
/* XXX locking */
addba_stop_timeout(tap);
if (tap->txa_flags & IEEE80211_AGGR_RUNNING) {
/* clear aggregation queue */
ieee80211_drain_ifq(&tap->txa_q);
tap->txa_flags &= ~IEEE80211_AGGR_RUNNING;
}
tap->txa_attempts = 0;
}
/*
* Process a received action frame using the default aggregation
* policy. We intercept ADDBA-related frames and use them to
* update our aggregation state. All other frames are passed up
* for processing by ieee80211_recv_action.
*/
static void
ieee80211_aggr_recv_action(struct ieee80211_node *ni,
const uint8_t *frm, const uint8_t *efrm)
{
struct ieee80211com *ic = ni->ni_ic;
struct ieee80211vap *vap = ni->ni_vap;
const struct ieee80211_action *ia;
struct ieee80211_rx_ampdu *rap;
struct ieee80211_tx_ampdu *tap;
uint8_t dialogtoken;
uint16_t baparamset, batimeout, baseqctl, code;
uint16_t args[4];
int tid, ac, bufsiz;
ia = (const struct ieee80211_action *) frm;
switch (ia->ia_category) {
case IEEE80211_ACTION_CAT_BA:
switch (ia->ia_action) {
case IEEE80211_ACTION_BA_ADDBA_REQUEST:
dialogtoken = frm[2];
baparamset = LE_READ_2(frm+3);
batimeout = LE_READ_2(frm+5);
baseqctl = LE_READ_2(frm+7);
tid = MS(baparamset, IEEE80211_BAPS_TID);
bufsiz = MS(baparamset, IEEE80211_BAPS_BUFSIZ);
IEEE80211_NOTE(vap,
IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
"recv ADDBA request: dialogtoken %u "
"baparamset 0x%x (tid %d bufsiz %d) batimeout %d "
"baseqctl %d:%d",
dialogtoken, baparamset, tid, bufsiz, batimeout,
MS(baseqctl, IEEE80211_BASEQ_START),
MS(baseqctl, IEEE80211_BASEQ_FRAG));
rap = &ni->ni_rx_ampdu[tid];
/* Send ADDBA response */
args[0] = dialogtoken;
/*
* NB: We ack only if the sta associated with HT and
* the ap is configured to do AMPDU rx (the latter
* violates the 11n spec and is mostly for testing).
*/
if ((ni->ni_flags & IEEE80211_NODE_AMPDU_RX) &&
(vap->iv_flags_ext & IEEE80211_FEXT_AMPDU_RX)) {
ampdu_rx_start(rap, bufsiz,
MS(baseqctl, IEEE80211_BASEQ_START));
args[1] = IEEE80211_STATUS_SUCCESS;
} else {
IEEE80211_NOTE(vap,
IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
ni, "reject ADDBA request: %s",
ni->ni_flags & IEEE80211_NODE_AMPDU_RX ?
"administratively disabled" :
"not negotiated for station");
vap->iv_stats.is_addba_reject++;
args[1] = IEEE80211_STATUS_UNSPECIFIED;
}
/* XXX honor rap flags? */
args[2] = IEEE80211_BAPS_POLICY_IMMEDIATE
| SM(tid, IEEE80211_BAPS_TID)
| SM(rap->rxa_wnd, IEEE80211_BAPS_BUFSIZ)
;
args[3] = 0;
ic->ic_send_action(ni, IEEE80211_ACTION_CAT_BA,
IEEE80211_ACTION_BA_ADDBA_RESPONSE, args);
return;
case IEEE80211_ACTION_BA_ADDBA_RESPONSE:
dialogtoken = frm[2];
code = LE_READ_2(frm+3);
baparamset = LE_READ_2(frm+5);
tid = MS(baparamset, IEEE80211_BAPS_TID);
bufsiz = MS(baparamset, IEEE80211_BAPS_BUFSIZ);
batimeout = LE_READ_2(frm+7);
ac = TID_TO_WME_AC(tid);
tap = &ni->ni_tx_ampdu[ac];
if ((tap->txa_flags & IEEE80211_AGGR_XCHGPEND) == 0) {
IEEE80211_DISCARD_MAC(vap,
IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
ni->ni_macaddr, "ADDBA response",
"no pending ADDBA, tid %d dialogtoken %u "
"code %d", tid, dialogtoken, code);
vap->iv_stats.is_addba_norequest++;
return;
}
if (dialogtoken != tap->txa_token) {
IEEE80211_DISCARD_MAC(vap,
IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
ni->ni_macaddr, "ADDBA response",
"dialogtoken mismatch: waiting for %d, "
"received %d, tid %d code %d",
tap->txa_token, dialogtoken, tid, code);
vap->iv_stats.is_addba_badtoken++;
return;
}
IEEE80211_NOTE(vap,
IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
"recv ADDBA response: dialogtoken %u code %d "
"baparamset 0x%x (tid %d bufsiz %d) batimeout %d",
dialogtoken, code, baparamset, tid, bufsiz,
batimeout);
ic->ic_addba_response(ni, tap,
code, baparamset, batimeout);
return;
case IEEE80211_ACTION_BA_DELBA:
baparamset = LE_READ_2(frm+2);
code = LE_READ_2(frm+4);
tid = MS(baparamset, IEEE80211_DELBAPS_TID);
IEEE80211_NOTE(vap,
IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
"recv DELBA: baparamset 0x%x (tid %d initiator %d) "
"code %d", baparamset, tid,
MS(baparamset, IEEE80211_DELBAPS_INIT), code);
if ((baparamset & IEEE80211_DELBAPS_INIT) == 0) {
ac = TID_TO_WME_AC(tid);
tap = &ni->ni_tx_ampdu[ac];
ic->ic_addba_stop(ni, tap);
} else {
rap = &ni->ni_rx_ampdu[tid];
ampdu_rx_stop(rap);
}
return;
}
break;
}
ieee80211_recv_action(ni, frm, efrm);
}
/*
* Process a received 802.11n action frame.
* Aggregation-related frames are assumed to be handled
* already; we handle any other frames we can, otherwise
* complain about being unsupported (with debugging).
*/
void
ieee80211_recv_action(struct ieee80211_node *ni,
const uint8_t *frm, const uint8_t *efrm)
{
struct ieee80211vap *vap = ni->ni_vap;
const struct ieee80211_action *ia;
int chw;
ia = (const struct ieee80211_action *) frm;
switch (ia->ia_category) {
case IEEE80211_ACTION_CAT_BA:
IEEE80211_NOTE(vap,
IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
"%s: BA action %d not implemented", __func__,
ia->ia_action);
vap->iv_stats.is_rx_mgtdiscard++;
break;
case IEEE80211_ACTION_CAT_HT:
switch (ia->ia_action) {
case IEEE80211_ACTION_HT_TXCHWIDTH:
chw = frm[2] == IEEE80211_A_HT_TXCHWIDTH_2040 ? 40 : 20;
if (chw != ni->ni_chw) {
ni->ni_chw = chw;
ni->ni_flags |= IEEE80211_NODE_CHWUPDATE;
}
IEEE80211_NOTE(vap,
IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
"%s: HT txchwidth, width %d (%s)",
__func__, chw,
ni->ni_flags & IEEE80211_NODE_CHWUPDATE ?
"new" : "no change");
break;
case IEEE80211_ACTION_HT_MIMOPWRSAVE:
IEEE80211_NOTE(vap,
IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
"%s: HT MIMO PS", __func__);
break;
default:
IEEE80211_NOTE(vap,
IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
"%s: HT action %d not implemented", __func__,
ia->ia_action);
vap->iv_stats.is_rx_mgtdiscard++;
break;
}
break;
default:
IEEE80211_NOTE(vap,
IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
"%s: category %d not implemented", __func__,
ia->ia_category);
vap->iv_stats.is_rx_mgtdiscard++;
break;
}
}
/*
* Transmit processing.
*/
/*
* Check if A-MPDU should be requested/enabled for a stream.
* We require a traffic rate above a per-AC threshold and we
* also handle backoff from previous failed attempts.
*
* Drivers may override this method to bring in information
* such as link state conditions in making the decision.
*/
static int
ieee80211_ampdu_enable(struct ieee80211_node *ni,
struct ieee80211_tx_ampdu *tap)
{
struct ieee80211vap *vap = ni->ni_vap;
if (tap->txa_avgpps < vap->iv_ampdu_mintraffic[tap->txa_ac])
return 0;
/* XXX check rssi? */
if (tap->txa_attempts >= ieee80211_addba_maxtries &&
ticks < tap->txa_nextrequest) {
/*
* Don't retry too often; txa_nextrequest is set
* to the minimum interval we'll retry after
* ieee80211_addba_maxtries failed attempts are made.
*/
return 0;
}
IEEE80211_NOTE(vap, IEEE80211_MSG_11N, ni,
"%s: enable AMPDU on %s, avgpps %d pkts %d",
__func__, ieee80211_wme_acnames[tap->txa_ac],
tap->txa_avgpps, tap->txa_pkts);
return 1;
}
/*
* Request A-MPDU tx aggregation. Setup local state and
* issue an ADDBA request. BA use will only happen after
* the other end replies with ADDBA response.
*/
int
ieee80211_ampdu_request(struct ieee80211_node *ni,
struct ieee80211_tx_ampdu *tap)
{
struct ieee80211com *ic = ni->ni_ic;
uint16_t args[4];
int tid, dialogtoken;
static int tokens = 0; /* XXX */
/* XXX locking */
if ((tap->txa_flags & IEEE80211_AGGR_SETUP) == 0) {
/* do deferred setup of state */
IEEE80211_TAPQ_INIT(tap);
callout_init(&tap->txa_timer, CALLOUT_MPSAFE);
tap->txa_flags |= IEEE80211_AGGR_SETUP;
}
/* XXX hack for not doing proper locking */
tap->txa_flags &= ~IEEE80211_AGGR_NAK;
dialogtoken = (tokens+1) % 63; /* XXX */
tid = WME_AC_TO_TID(tap->txa_ac);
args[0] = dialogtoken;
args[1] = IEEE80211_BAPS_POLICY_IMMEDIATE
| SM(tid, IEEE80211_BAPS_TID)
| SM(IEEE80211_AGGR_BAWMAX, IEEE80211_BAPS_BUFSIZ)
;
args[2] = 0; /* batimeout */
/* NB: do first so there's no race against reply */
if (!ic->ic_addba_request(ni, tap, dialogtoken, args[1], args[2])) {
/* unable to setup state, don't make request */
IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_11N,
ni, "%s: could not setup BA stream for AC %d",
__func__, tap->txa_ac);
/* defer next try so we don't slam the driver with requests */
tap->txa_attempts = ieee80211_addba_maxtries;
/* NB: check in case driver wants to override */
if (tap->txa_nextrequest <= ticks)
tap->txa_nextrequest = ticks + ieee80211_addba_backoff;
return 0;
}
tokens = dialogtoken; /* allocate token */
/* NB: after calling ic_addba_request so driver can set seqstart */
args[3] = SM(tap->txa_seqstart, IEEE80211_BASEQ_START)
| SM(0, IEEE80211_BASEQ_FRAG)
;
return ic->ic_send_action(ni, IEEE80211_ACTION_CAT_BA,
IEEE80211_ACTION_BA_ADDBA_REQUEST, args);
}
/*
* Terminate an AMPDU tx stream. State is reclaimed
* and the peer notified with a DelBA Action frame.
*/
void
ieee80211_ampdu_stop(struct ieee80211_node *ni, struct ieee80211_tx_ampdu *tap)
{
struct ieee80211com *ic = ni->ni_ic;
struct ieee80211vap *vap = ni->ni_vap;
uint16_t args[4];
/* XXX locking */
if (IEEE80211_AMPDU_RUNNING(tap)) {
IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
ni, "%s: stop BA stream for AC %d", __func__, tap->txa_ac);
vap->iv_stats.is_ampdu_stop++;
ic->ic_addba_stop(ni, tap);
args[0] = WME_AC_TO_TID(tap->txa_ac);
args[1] = IEEE80211_DELBAPS_INIT;
args[2] = 1; /* XXX reason code */
ieee80211_send_action(ni, IEEE80211_ACTION_CAT_BA,
IEEE80211_ACTION_BA_DELBA, args);
} else {
IEEE80211_NOTE(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
ni, "%s: BA stream for AC %d not running",
__func__, tap->txa_ac);
vap->iv_stats.is_ampdu_stop_failed++;
}
}
/*
* Transmit a BAR frame to the specified node. The
* BAR contents are drawn from the supplied aggregation
* state associated with the node.
*/
int
ieee80211_send_bar(struct ieee80211_node *ni,
const struct ieee80211_tx_ampdu *tap)
{
#define senderr(_x, _v) do { vap->iv_stats._v++; ret = _x; goto bad; } while (0)
#define ADDSHORT(frm, v) do { \
frm[0] = (v) & 0xff; \
frm[1] = (v) >> 8; \
frm += 2; \
} while (0)
struct ieee80211vap *vap = ni->ni_vap;
struct ieee80211com *ic = ni->ni_ic;
struct ieee80211_frame_min *wh;
struct mbuf *m;
uint8_t *frm;
uint16_t barctl, barseqctl;
int tid, ret;
ieee80211_ref_node(ni);
m = ieee80211_getmgtframe(&frm,
ic->ic_headroom + sizeof(struct ieee80211_frame_min),
sizeof(struct ieee80211_ba_request)
);
if (m == NULL)
senderr(ENOMEM, is_tx_nobuf);
wh = mtod(m, struct ieee80211_frame_min *);
wh->i_fc[0] = IEEE80211_FC0_VERSION_0 |
IEEE80211_FC0_TYPE_CTL | IEEE80211_FC0_SUBTYPE_BAR;
wh->i_fc[1] = 0;
IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_macaddr);
IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr);
tid = WME_AC_TO_TID(tap->txa_ac);
barctl = (tap->txa_flags & IEEE80211_AGGR_IMMEDIATE ?
IEEE80211_BAPS_POLICY_IMMEDIATE :
IEEE80211_BAPS_POLICY_DELAYED)
| SM(tid, IEEE80211_BAPS_TID)
| SM(tap->txa_wnd, IEEE80211_BAPS_BUFSIZ)
;
barseqctl = SM(tap->txa_start, IEEE80211_BASEQ_START)
| SM(0, IEEE80211_BASEQ_FRAG)
;
ADDSHORT(frm, barctl);
ADDSHORT(frm, barseqctl);
m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
M_WME_SETAC(m, WME_AC_VO);
IEEE80211_NODE_STAT(ni, tx_mgmt); /* XXX tx_ctl? */
IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS,
ni, "send bar frame (tid %u start %u) on channel %u",
tid, tap->txa_start, ieee80211_chan2ieee(ic, ic->ic_curchan));
return ic->ic_raw_xmit(ni, m, NULL);
bad:
ieee80211_free_node(ni);
return ret;
#undef ADDSHORT
#undef senderr
}
/*
* Send an action management frame. The arguments are stuff
* into a frame without inspection; the caller is assumed to
* prepare them carefully (e.g. based on the aggregation state).
*/
int
ieee80211_send_action(struct ieee80211_node *ni,
int category, int action, uint16_t args[4])
{
#define senderr(_x, _v) do { vap->iv_stats._v++; ret = _x; goto bad; } while (0)
#define ADDSHORT(frm, v) do { \
frm[0] = (v) & 0xff; \
frm[1] = (v) >> 8; \
frm += 2; \
} while (0)
struct ieee80211vap *vap = ni->ni_vap;
struct ieee80211com *ic = ni->ni_ic;
struct mbuf *m;
uint8_t *frm;
uint16_t baparamset;
int ret;
KASSERT(ni != NULL, ("null node"));
/*
* Hold a reference on the node so it doesn't go away until after
* the xmit is complete all the way in the driver. On error we
* will remove our reference.
*/
IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
"ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n",
__func__, __LINE__,
ni, ether_sprintf(ni->ni_macaddr),
ieee80211_node_refcnt(ni)+1);
ieee80211_ref_node(ni);
m = ieee80211_getmgtframe(&frm,
ic->ic_headroom + sizeof(struct ieee80211_frame),
sizeof(uint16_t) /* action+category */
/* XXX may action payload */
+ sizeof(struct ieee80211_action_ba_addbaresponse)
);
if (m == NULL)
senderr(ENOMEM, is_tx_nobuf);
*frm++ = category;
*frm++ = action;
switch (category) {
case IEEE80211_ACTION_CAT_BA:
switch (action) {
case IEEE80211_ACTION_BA_ADDBA_REQUEST:
IEEE80211_NOTE(vap,
IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
"send ADDBA request: dialogtoken %d "
"baparamset 0x%x (tid %d) batimeout 0x%x baseqctl 0x%x",
args[0], args[1], MS(args[1], IEEE80211_BAPS_TID),
args[2], args[3]);
*frm++ = args[0]; /* dialog token */
ADDSHORT(frm, args[1]); /* baparamset */
ADDSHORT(frm, args[2]); /* batimeout */
ADDSHORT(frm, args[3]); /* baseqctl */
break;
case IEEE80211_ACTION_BA_ADDBA_RESPONSE:
IEEE80211_NOTE(vap,
IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
"send ADDBA response: dialogtoken %d status %d "
"baparamset 0x%x (tid %d) batimeout %d",
args[0], args[1], args[2],
MS(args[2], IEEE80211_BAPS_TID), args[3]);
*frm++ = args[0]; /* dialog token */
ADDSHORT(frm, args[1]); /* statuscode */
ADDSHORT(frm, args[2]); /* baparamset */
ADDSHORT(frm, args[3]); /* batimeout */
break;
case IEEE80211_ACTION_BA_DELBA:
/* XXX */
baparamset = SM(args[0], IEEE80211_DELBAPS_TID)
| SM(args[1], IEEE80211_DELBAPS_INIT)
;
ADDSHORT(frm, baparamset);
ADDSHORT(frm, args[2]); /* reason code */
IEEE80211_NOTE(vap,
IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
"send DELBA action: tid %d, initiator %d reason %d",
args[0], args[1], args[2]);
break;
default:
goto badaction;
}
break;
case IEEE80211_ACTION_CAT_HT:
switch (action) {
case IEEE80211_ACTION_HT_TXCHWIDTH:
IEEE80211_NOTE(vap,
IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
ni, "send HT txchwidth: width %d",
IEEE80211_IS_CHAN_HT40(ni->ni_chan) ? 40 : 20
);
*frm++ = IEEE80211_IS_CHAN_HT40(ni->ni_chan) ?
IEEE80211_A_HT_TXCHWIDTH_2040 :
IEEE80211_A_HT_TXCHWIDTH_20;
break;
default:
goto badaction;
}
break;
default:
badaction:
IEEE80211_NOTE(vap,
IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
"%s: unsupported category %d action %d", __func__,
category, action);
senderr(EINVAL, is_tx_unknownmgt);
/* NOTREACHED */
}
m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
return ieee80211_mgmt_output(ni, m, IEEE80211_FC0_SUBTYPE_ACTION);
bad:
ieee80211_free_node(ni);
if (m != NULL)
m_freem(m);
return ret;
#undef ADDSHORT
#undef senderr
}
/*
* Construct the MCS bit mask for inclusion
* in an HT information element.
*/
static void
ieee80211_set_htrates(uint8_t *frm, const struct ieee80211_htrateset *rs)
{
int i;
for (i = 0; i < rs->rs_nrates; i++) {
int r = rs->rs_rates[i] & IEEE80211_RATE_VAL;
if (r < IEEE80211_HTRATE_MAXSIZE) { /* XXX? */
/* NB: this assumes a particular implementation */
setbit(frm, r);
}
}
}
/*
* Add body of an HTCAP information element.
*/
static uint8_t *
ieee80211_add_htcap_body(uint8_t *frm, struct ieee80211_node *ni)
{
#define ADDSHORT(frm, v) do { \
frm[0] = (v) & 0xff; \
frm[1] = (v) >> 8; \
frm += 2; \
} while (0)
struct ieee80211vap *vap = ni->ni_vap;
uint16_t caps;
int rxmax, density;
/* HT capabilities */
caps = vap->iv_htcaps & 0xffff;
/*
* Note channel width depends on whether we are operating as
* a sta or not. When operating as a sta we are generating
* a request based on our desired configuration. Otherwise
* we are operational and the channel attributes identify
* how we've been setup (which might be different if a fixed
* channel is specified).
*/
if (vap->iv_opmode == IEEE80211_M_STA) {
/* override 20/40 use based on config */
if (vap->iv_flags_ext & IEEE80211_FEXT_USEHT40)
caps |= IEEE80211_HTCAP_CHWIDTH40;
else
caps &= ~IEEE80211_HTCAP_CHWIDTH40;
/* use advertised setting (XXX locally constraint) */
rxmax = MS(ni->ni_htparam, IEEE80211_HTCAP_MAXRXAMPDU);
density = MS(ni->ni_htparam, IEEE80211_HTCAP_MPDUDENSITY);
} else {
/* override 20/40 use based on current channel */
if (IEEE80211_IS_CHAN_HT40(ni->ni_chan))
caps |= IEEE80211_HTCAP_CHWIDTH40;
else
caps &= ~IEEE80211_HTCAP_CHWIDTH40;
rxmax = vap->iv_ampdu_rxmax;
density = vap->iv_ampdu_density;
}
/* adjust short GI based on channel and config */
if ((vap->iv_flags_ext & IEEE80211_FEXT_SHORTGI20) == 0)
caps &= ~IEEE80211_HTCAP_SHORTGI20;
if ((vap->iv_flags_ext & IEEE80211_FEXT_SHORTGI40) == 0 ||
(caps & IEEE80211_HTCAP_CHWIDTH40) == 0)
caps &= ~IEEE80211_HTCAP_SHORTGI40;
ADDSHORT(frm, caps);
/* HT parameters */
*frm = SM(rxmax, IEEE80211_HTCAP_MAXRXAMPDU)
| SM(density, IEEE80211_HTCAP_MPDUDENSITY)
;
frm++;
/* pre-zero remainder of ie */
memset(frm, 0, sizeof(struct ieee80211_ie_htcap) -
__offsetof(struct ieee80211_ie_htcap, hc_mcsset));
/* supported MCS set */
/*
* XXX it would better to get the rate set from ni_htrates
* so we can restrict it but for sta mode ni_htrates isn't
* setup when we're called to form an AssocReq frame so for
* now we're restricted to the default HT rate set.
*/
ieee80211_set_htrates(frm, &ieee80211_rateset_11n);
frm += sizeof(struct ieee80211_ie_htcap) -
__offsetof(struct ieee80211_ie_htcap, hc_mcsset);
return frm;
#undef ADDSHORT
}
/*
* Add 802.11n HT capabilities information element
*/
uint8_t *
ieee80211_add_htcap(uint8_t *frm, struct ieee80211_node *ni)
{
frm[0] = IEEE80211_ELEMID_HTCAP;
frm[1] = sizeof(struct ieee80211_ie_htcap) - 2;
return ieee80211_add_htcap_body(frm + 2, ni);
}
/*
* Add Broadcom OUI wrapped standard HTCAP ie; this is
* used for compatibility w/ pre-draft implementations.
*/
uint8_t *
ieee80211_add_htcap_vendor(uint8_t *frm, struct ieee80211_node *ni)
{
frm[0] = IEEE80211_ELEMID_VENDOR;
frm[1] = 4 + sizeof(struct ieee80211_ie_htcap) - 2;
frm[2] = (BCM_OUI >> 0) & 0xff;
frm[3] = (BCM_OUI >> 8) & 0xff;
frm[4] = (BCM_OUI >> 16) & 0xff;
frm[5] = BCM_OUI_HTCAP;
return ieee80211_add_htcap_body(frm + 6, ni);
}
/*
* Construct the MCS bit mask of basic rates
* for inclusion in an HT information element.
*/
static void
ieee80211_set_basic_htrates(uint8_t *frm, const struct ieee80211_htrateset *rs)
{
int i;
for (i = 0; i < rs->rs_nrates; i++) {
int r = rs->rs_rates[i] & IEEE80211_RATE_VAL;
if ((rs->rs_rates[i] & IEEE80211_RATE_BASIC) &&
r < IEEE80211_HTRATE_MAXSIZE) {
/* NB: this assumes a particular implementation */
setbit(frm, r);
}
}
}
/*
* Update the HTINFO ie for a beacon frame.
*/
void
ieee80211_ht_update_beacon(struct ieee80211vap *vap,
struct ieee80211_beacon_offsets *bo)
{
#define PROTMODE (IEEE80211_HTINFO_OPMODE|IEEE80211_HTINFO_NONHT_PRESENT)
const struct ieee80211_channel *bsschan = vap->iv_bss->ni_chan;
struct ieee80211com *ic = vap->iv_ic;
struct ieee80211_ie_htinfo *ht =
(struct ieee80211_ie_htinfo *) bo->bo_htinfo;
/* XXX only update on channel change */
ht->hi_ctrlchannel = ieee80211_chan2ieee(ic, bsschan);
ht->hi_byte1 = IEEE80211_HTINFO_RIFSMODE_PROH;
if (IEEE80211_IS_CHAN_HT40U(bsschan))
ht->hi_byte1 |= IEEE80211_HTINFO_2NDCHAN_ABOVE;
else if (IEEE80211_IS_CHAN_HT40D(bsschan))
ht->hi_byte1 |= IEEE80211_HTINFO_2NDCHAN_BELOW;
else
ht->hi_byte1 |= IEEE80211_HTINFO_2NDCHAN_NONE;
if (IEEE80211_IS_CHAN_HT40(bsschan))
ht->hi_byte1 |= IEEE80211_HTINFO_TXWIDTH_2040;
/* protection mode */
ht->hi_byte2 = (ht->hi_byte2 &~ PROTMODE) | ic->ic_curhtprotmode;
/* XXX propagate to vendor ie's */
#undef PROTMODE
}
/*
* Add body of an HTINFO information element.
*
* NB: We don't use struct ieee80211_ie_htinfo because we can
* be called to fillin both a standard ie and a compat ie that
* has a vendor OUI at the front.
*/
static uint8_t *
ieee80211_add_htinfo_body(uint8_t *frm, struct ieee80211_node *ni)
{
struct ieee80211com *ic = ni->ni_ic;
/* pre-zero remainder of ie */
memset(frm, 0, sizeof(struct ieee80211_ie_htinfo) - 2);
/* primary/control channel center */
*frm++ = ieee80211_chan2ieee(ic, ni->ni_chan);
frm[0] = IEEE80211_HTINFO_RIFSMODE_PROH;
if (IEEE80211_IS_CHAN_HT40U(ni->ni_chan))
frm[0] |= IEEE80211_HTINFO_2NDCHAN_ABOVE;
else if (IEEE80211_IS_CHAN_HT40D(ni->ni_chan))
frm[0] |= IEEE80211_HTINFO_2NDCHAN_BELOW;
else
frm[0] |= IEEE80211_HTINFO_2NDCHAN_NONE;
if (IEEE80211_IS_CHAN_HT40(ni->ni_chan))
frm[0] |= IEEE80211_HTINFO_TXWIDTH_2040;
frm[1] = ic->ic_curhtprotmode;
frm += 5;
/* basic MCS set */
ieee80211_set_basic_htrates(frm, &ni->ni_htrates);
frm += sizeof(struct ieee80211_ie_htinfo) -
__offsetof(struct ieee80211_ie_htinfo, hi_basicmcsset);
return frm;
}
/*
* Add 802.11n HT information information element.
*/
uint8_t *
ieee80211_add_htinfo(uint8_t *frm, struct ieee80211_node *ni)
{
frm[0] = IEEE80211_ELEMID_HTINFO;
frm[1] = sizeof(struct ieee80211_ie_htinfo) - 2;
return ieee80211_add_htinfo_body(frm + 2, ni);
}
/*
* Add Broadcom OUI wrapped standard HTINFO ie; this is
* used for compatibility w/ pre-draft implementations.
*/
uint8_t *
ieee80211_add_htinfo_vendor(uint8_t *frm, struct ieee80211_node *ni)
{
frm[0] = IEEE80211_ELEMID_VENDOR;
frm[1] = 4 + sizeof(struct ieee80211_ie_htinfo) - 2;
frm[2] = (BCM_OUI >> 0) & 0xff;
frm[3] = (BCM_OUI >> 8) & 0xff;
frm[4] = (BCM_OUI >> 16) & 0xff;
frm[5] = BCM_OUI_HTINFO;
return ieee80211_add_htinfo_body(frm + 6, ni);
}
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