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-rw-r--r--sys/net80211/ieee80211_ht.c1472
1 files changed, 1472 insertions, 0 deletions
diff --git a/sys/net80211/ieee80211_ht.c b/sys/net80211/ieee80211_ht.c
new file mode 100644
index 0000000..9b6223c
--- /dev/null
+++ b/sys/net80211/ieee80211_ht.c
@@ -0,0 +1,1472 @@
+/*-
+ * Copyright (c) 2007 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 <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>
+
+/* define here, used throughout file */
+#define MS(_v, _f) (((_v) & _f) >> _f##_S)
+#define SM(_v, _f) (((_v) << _f##_S) & _f)
+
+/* XXX need max array size */
+const int ieee80211_htrates[16] = {
+ 13, /* IFM_IEEE80211_MCS0 */
+ 26, /* IFM_IEEE80211_MCS1 */
+ 39, /* IFM_IEEE80211_MCS2 */
+ 52, /* IFM_IEEE80211_MCS3 */
+ 78, /* IFM_IEEE80211_MCS4 */
+ 104, /* IFM_IEEE80211_MCS5 */
+ 117, /* IFM_IEEE80211_MCS6 */
+ 130, /* IFM_IEEE80211_MCS7 */
+ 26, /* IFM_IEEE80211_MCS8 */
+ 52, /* IFM_IEEE80211_MCS9 */
+ 78, /* IFM_IEEE80211_MCS10 */
+ 104, /* IFM_IEEE80211_MCS11 */
+ 156, /* IFM_IEEE80211_MCS12 */
+ 208, /* IFM_IEEE80211_MCS13 */
+ 234, /* IFM_IEEE80211_MCS14 */
+ 260, /* IFM_IEEE80211_MCS15 */
+};
+
+static const struct ieee80211_htrateset ieee80211_rateset_11n =
+ { 16, {
+ /* MCS: 6.5 13 19.5 26 39 52 58.5 65 13 26 */
+ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
+ /* 39 52 78 104 117, 130 */
+ 10, 11, 12, 13, 14, 15 }
+ };
+
+#define IEEE80211_AGGR_TIMEOUT msecs_to_ticks(250)
+#define IEEE80211_AGGR_MINRETRY msecs_to_ticks(10*1000)
+#define IEEE80211_AGGR_MAXTRIES 3
+
+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)
+{
+
+ ic->ic_ampdu_rxmax = IEEE80211_HTCAP_MAXRXAMPDU_8K;
+ ic->ic_ampdu_density = IEEE80211_HTCAP_MPDUDENSITY_NA;
+ ic->ic_ampdu_limit = ic->ic_ampdu_rxmax;
+
+ ic->ic_amsdu_limit = IEEE80211_HTCAP_MAXAMSDU_3839;
+
+ /* setup default aggregation policy */
+ ic->ic_recv_action = ieee80211_aggr_recv_action;
+ ic->ic_send_action = ieee80211_send_action;
+ ic->ic_addba_request = ieee80211_addba_request;
+ ic->ic_addba_response = ieee80211_addba_response;
+ ic->ic_addba_stop = ieee80211_addba_stop;
+
+ if (isset(ic->ic_modecaps, IEEE80211_MODE_11NA) ||
+ isset(ic->ic_modecaps, IEEE80211_MODE_11NG)) {
+ /*
+ * There are HT channels in the channel list; enable
+ * all HT-related facilities by default.
+ * XXX these choices may be too aggressive.
+ */
+ ic->ic_flags_ext |= IEEE80211_FEXT_HT
+ | IEEE80211_FEXT_HTCOMPAT
+ ;
+ if (ic->ic_htcaps & IEEE80211_HTCAP_SHORTGI20)
+ ic->ic_flags_ext |= IEEE80211_FEXT_SHORTGI20;
+ /* XXX infer from channel list */
+ if (ic->ic_htcaps & IEEE80211_HTCAP_CHWIDTH40) {
+ ic->ic_flags_ext |= IEEE80211_FEXT_USEHT40;
+ if (ic->ic_htcaps & IEEE80211_HTCAP_SHORTGI40)
+ ic->ic_flags_ext |= IEEE80211_FEXT_SHORTGI40;
+ }
+ /* NB: A-MPDU and A-MSDU rx are mandated, these are tx only */
+ ic->ic_flags_ext |= IEEE80211_FEXT_AMPDU_RX;
+ if (ic->ic_htcaps & IEEE80211_HTC_AMPDU)
+ ic->ic_flags_ext |= IEEE80211_FEXT_AMPDU_TX;
+ ic->ic_flags_ext |= IEEE80211_FEXT_AMSDU_RX;
+ if (ic->ic_htcaps & IEEE80211_HTC_AMSDU)
+ ic->ic_flags_ext |= IEEE80211_FEXT_AMSDU_TX;
+ }
+}
+
+void
+ieee80211_ht_detach(struct ieee80211com *ic)
+{
+}
+
+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], mode);
+ if (IFM_SUBTYPE(mword) != IFM_IEEE80211_MCS)
+ continue;
+ rate = ieee80211_htrates[rs->rs_rates[i]];
+ 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)
+{
+ if (IEEE80211_IS_CHAN_HT(c))
+ return &ieee80211_rateset_11n;
+ /* XXX what's the right thing to do here? */
+ return (const struct ieee80211_htrateset *)
+ ieee80211_get_suprates(ic, c);
+}
+
+/*
+ * 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 ieee80211com *ic = ni->ni_ic;
+ int totallen, framelen;
+ struct mbuf *n;
+
+ /* discard 802.3 header inserted by ieee80211_decap */
+ m_adj(m, sizeof(struct ether_header));
+
+ ic->ic_stats.is_amsdu_decap++;
+
+ totallen = m->m_pkthdr.len;
+ 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(ic, IEEE80211_MSG_ANY,
+ ni->ni_macaddr, "a-msdu", "%s", "first decap failed");
+ ic->ic_stats.is_amsdu_tooshort++;
+ return NULL;
+ }
+ if (framelen == totallen)
+ break;
+ n = m_split(m, framelen, M_NOWAIT);
+ if (n == NULL) {
+ IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_ANY,
+ ni->ni_macaddr, "a-msdu",
+ "%s", "unable to split encapsulated frames");
+ ic->ic_stats.is_amsdu_split++;
+ m_freem(m); /* NB: must reclaim */
+ return NULL;
+ }
+ ieee80211_deliver_data(ic, 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 */
+}
+
+/*
+ * 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)
+{
+ memset(rap, 0, sizeof(*rap));
+ rap->rxa_wnd = (bufsiz == 0) ?
+ IEEE80211_AGGR_BAWMAX : min(bufsiz, IEEE80211_AGGR_BAWMAX);
+ rap->rxa_start = start;
+ rap->rxa_nxt = rap->rxa_start;
+ rap->rxa_flags |= IEEE80211_AGGR_XCHGPEND;
+}
+
+/*
+ * 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));
+}
+
+/*
+ * Stop A-MPDU rx processing for the specified TID.
+ */
+static void
+ampdu_rx_stop(struct ieee80211_rx_ampdu *rap)
+{
+ rap->rxa_flags &= ~IEEE80211_AGGR_XCHGPEND;
+ ampdu_rx_purge(rap);
+}
+
+/*
+ * 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->ni_ic, m, ni, 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 ieee80211com *ic = ni->ni_ic;
+ 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);
+ }
+ /*
+ * Adjust the start of the BA window to
+ * reflect the frames just dispatched.
+ */
+ rap->rxa_start = IEEE80211_SEQ_ADD(rap->rxa_start, i);
+ rap->rxa_nxt = rap->rxa_start;
+ ic->ic_stats.is_ampdu_rx_oor += i;
+ /*
+ * 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));
+ ic->ic_stats.is_ampdu_rx_copy += rap->rxa_qframes;
+ }
+}
+
+/*
+ * Dispatch all frames in the A-MPDU
+ * re-order queue up to the specified slot.
+ */
+static void
+ampdu_rx_flush(struct ieee80211_node *ni,
+ struct ieee80211_rx_ampdu *rap, int limit)
+{
+ struct mbuf *m;
+ int i;
+
+ for (i = 0; i < limit; i++) {
+ m = rap->rxa_m[i];
+ if (m == NULL)
+ continue;
+ rap->rxa_m[i] = NULL;
+ rap->rxa_qbytes -= m->m_pkthdr.len;
+ ampdu_dispatch(ni, m);
+ if (--rap->rxa_qframes == 0)
+ break;
+ }
+}
+
+/*
+ * 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)
+ struct ieee80211com *ic = ni->ni_ic;
+ 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"));
+
+ /* XXX 4-address frame */
+ tid = wh->i_qos[0] & 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 0;
+ }
+ rxseq = le16toh(*(uint16_t *)wh->i_seq) >> IEEE80211_SEQ_SEQ_SHIFT;
+ 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 1; /* NB: consumed */
+ } else {
+ /*
+ * In order; advance window and notify
+ * caller to dispatch directly.
+ */
+ rap->rxa_start = IEEE80211_SEQ_INC(rxseq);
+ rap->rxa_nxt = rap->rxa_start;
+ return 0; /* NB: process packet */
+ }
+ }
+ /*
+ * This packet is out of order; store it
+ * if it's in the BA window.
+ */
+ /* calculate offset in BA window */
+ off = IEEE80211_SEQ_SUB(rxseq, rap->rxa_start);
+ if (off >= rap->rxa_wnd) {
+ /*
+ * Outside the window, clear the q and start over.
+ *
+ * NB: this handles the case where rxseq is before
+ * rxa_start because our max BA window is 64
+ * and the sequence number range is 4096.
+ */
+ IEEE80211_NOTE(ic, IEEE80211_MSG_11N, ni,
+ "flush BA win <%u:%u> (%u frames) rxseq %u tid %u",
+ rap->rxa_start,
+ IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd),
+ rap->rxa_qframes, rxseq, tid);
+
+ if (rap->rxa_qframes != 0) {
+ ic->ic_stats.is_ampdu_rx_oor += rap->rxa_qframes;
+ ampdu_rx_flush(ni, rap, rap->rxa_wnd);
+ KASSERT(rap->rxa_qbytes == 0 && rap->rxa_qframes == 0,
+ ("lost %u data, %u frames on ampdu rx q",
+ rap->rxa_qbytes, rap->rxa_qframes));
+ }
+ rap->rxa_start = IEEE80211_SEQ_INC(rxseq);
+ rap->rxa_nxt = rap->rxa_start;
+ return 0; /* NB: process packet */
+ }
+ if (rap->rxa_qframes != 0) {
+#if 0
+ /* XXX honor batimeout? */
+ if (ticks - mn->mn_age[tid] > 50) {
+ /*
+ * Too long since we received the first frame; flush.
+ */
+ if (rap->rxa_qframes != 0) {
+ ic->ic_stats.is_ampdu_rx_oor +=
+ rap->rxa_qframes;
+ ampdu_rx_flush(ni, rap, rap->rxa_wnd);
+ }
+ rap->rxa_start = IEEE80211_SEQ_INC(rxseq);
+ rap->rxa_nxt = rap->rxa_start;
+ return 0; /* NB: process packet */
+ }
+#endif
+ rap->rxa_nxt = rxseq;
+ } else {
+ /*
+ * First frame, start aging timer.
+ */
+#if 0
+ mn->mn_age[tid] = ticks;
+#endif
+ }
+ /* save packet */
+ if (rap->rxa_m[off] == NULL) {
+ rap->rxa_m[off] = m;
+ rap->rxa_qframes++;
+ rap->rxa_qbytes += m->m_pkthdr.len;
+ } else {
+ IEEE80211_DISCARD_MAC(ic,
+ 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, rap->rxa_wnd);
+ ic->ic_stats.is_rx_dup++;
+ IEEE80211_NODE_STAT(ni, rx_dup);
+ m_freem(m);
+ }
+ return 1; /* NB: consumed */
+#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 the window it's discarded.
+ */
+void
+ieee80211_recv_bar(struct ieee80211_node *ni, struct mbuf *m0)
+{
+ struct ieee80211com *ic = ni->ni_ic;
+ struct ieee80211_frame_bar *wh;
+ struct ieee80211_rx_ampdu *rap;
+ ieee80211_seq rxseq;
+ int tid, off;
+
+ 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(ic,
+ IEEE80211_MSG_INPUT | IEEE80211_MSG_11N,
+ ni->ni_macaddr, "BAR", "no BA stream, tid %u", tid);
+ ic->ic_stats.is_ampdu_bar_bad++;
+ return;
+ }
+ ic->ic_stats.is_ampdu_bar_rx++;
+ rxseq = le16toh(wh->i_seq) >> IEEE80211_SEQ_SEQ_SHIFT;
+ /* calculate offset in BA window */
+ off = IEEE80211_SEQ_SUB(rxseq, rap->rxa_start);
+ if (off >= rap->rxa_wnd) {
+ /*
+ * Outside the window, flush the reorder q if
+ * not pulling the sequence # backward. The
+ * latter is typically caused by a dropped BA.
+ */
+ IEEE80211_NOTE(ic, IEEE80211_MSG_INPUT | IEEE80211_MSG_11N, ni,
+ "recv BAR outside BA win <%u:%u> rxseq %u tid %u",
+ rap->rxa_start,
+ IEEE80211_SEQ_ADD(rap->rxa_start, rap->rxa_wnd),
+ rxseq, tid);
+ ic->ic_stats.is_ampdu_bar_oow++;
+ if (rxseq < rap->rxa_start) {
+ /* XXX stat? */
+ return;
+ }
+ if (rap->rxa_qframes != 0) {
+ ic->ic_stats.is_ampdu_rx_oor += rap->rxa_qframes;
+ ampdu_rx_flush(ni, rap, rap->rxa_wnd);
+ KASSERT(rap->rxa_qbytes == 0 && rap->rxa_qframes == 0,
+ ("lost %u data, %u frames on ampdu rx q",
+ rap->rxa_qbytes, rap->rxa_qframes));
+ }
+ } else if (rap->rxa_qframes != 0) {
+ /*
+ * Dispatch packets up to rxseq.
+ */
+ ampdu_rx_flush(ni, rap, off);
+ ic->ic_stats.is_ampdu_rx_oor += off;
+
+ /*
+ * 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 = off+1; j < rap->rxa_wnd; j++) {
+ if (rap->rxa_m[j] != NULL) {
+ rap->rxa_m[j-off] = rap->rxa_m[j];
+ rap->rxa_m[j] = NULL;
+ if (--n == 0)
+ break;
+ }
+ }
+ KASSERT(n == 0, ("lost %d frames", n));
+ ic->ic_stats.is_ampdu_rx_copy += rap->rxa_qframes;
+ }
+ }
+ rap->rxa_start = rxseq;
+ rap->rxa_nxt = rap->rxa_start;
+}
+
+/*
+ * 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;
+
+ ieee80211_parse_htcap(ni, htcap);
+ for (ac = 0; ac < WME_NUM_AC; ac++) {
+ tap = &ni->ni_tx_ampdu[ac];
+ tap->txa_ac = ac;
+ }
+ ni->ni_flags |= IEEE80211_NODE_HT;
+}
+
+/*
+ * 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 (IEEE80211_AMPDU_REQUESTED(tap))
+ ic->ic_addba_stop(ni, &ni->ni_tx_ampdu[i]);
+ }
+ 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);
+}
+
+/* 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 ieee80211com *ic = ni->ni_ic;
+
+ 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));
+ if ((ic->ic_flags_ext & IEEE80211_FEXT_SHORTGI40) == 0)
+ ni->ni_htcap &= ~IEEE80211_HTCAP_SHORTGI40;
+ if ((ic->ic_flags_ext & IEEE80211_FEXT_SHORTGI20) == 0)
+ ni->ni_htcap &= ~IEEE80211_HTCAP_SHORTGI20;
+ ni->ni_chw = (ni->ni_htcap & IEEE80211_HTCAP_CHWIDTH40) ? 40 : 20;
+ ni->ni_htparam = ie[__offsetof(struct ieee80211_ie_htcap, hc_param)];
+#if 0
+ ni->ni_maxampdu =
+ (8*1024) << MS(ni->ni_htparam, IEEE80211_HTCAP_MAXRXAMPDU);
+ ni->ni_mpdudensity = MS(ni->ni_htparam, IEEE80211_HTCAP_MPDUDENSITY);
+#endif
+}
+
+/*
+ * Process an 802.11n HT info ie.
+ */
+void
+ieee80211_parse_htinfo(struct ieee80211_node *ni, const uint8_t *ie)
+{
+ const struct ieee80211_ie_htinfo *htinfo;
+ uint16_t w;
+ int chw;
+
+ 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_byte23);
+ ni->ni_htopmode = SM(w, IEEE80211_HTINFO_OPMODE);
+ w = LE_READ_2(&htinfo->hi_byte45);
+ ni->ni_htstbc = SM(w, IEEE80211_HTINFO_BASIC_STBCMCS);
+ /* update node's recommended tx channel width */
+ chw = (htinfo->hi_byte1 & IEEE80211_HTINFO_TXWIDTH_2040) ? 40 : 20;
+ if (chw != ni->ni_chw) {
+ ni->ni_chw = chw;
+ ni->ni_flags |= IEEE80211_NODE_CHWUPDATE;
+ }
+}
+
+/*
+ * 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 ieee80211com *ic = ni->ni_ic;
+ 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(ic,
+ IEEE80211_MSG_XRATE | IEEE80211_MSG_11N, ni,
+ "WARNING, HT rate set too large; only "
+ "using %u rates", IEEE80211_HTRATE_MAXSIZE);
+ ic->ic_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_ic,
+ 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_AGGR_TIMEOUT,
+ addba_timeout, tap);
+ tap->txa_flags |= IEEE80211_AGGR_XCHGPEND;
+ tap->txa_lastrequest = ticks;
+}
+
+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;
+ }
+ 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;
+ 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(ic,
+ IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
+ "recv ADDBA request: dialogtoken %u "
+ "baparamset 0x%x (tid %d bufsiz %d) batimeout %d "
+ "baseqctl %d",
+ dialogtoken, baparamset, tid, bufsiz,
+ batimeout, baseqctl);
+
+ rap = &ni->ni_rx_ampdu[tid];
+
+ /* Send ADDBA response */
+ args[0] = dialogtoken;
+ if (ic->ic_flags_ext & IEEE80211_FEXT_AMPDU_RX) {
+ ampdu_rx_start(rap, bufsiz,
+ MS(baseqctl, IEEE80211_BASEQ_START));
+
+ args[1] = IEEE80211_STATUS_SUCCESS;
+ } else
+ 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);
+
+ IEEE80211_NOTE(ic,
+ 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);
+
+ ac = TID_TO_WME_AC(tid);
+ tap = &ni->ni_tx_ampdu[ac];
+
+ 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(ic,
+ 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;
+ }
+ return 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 ieee80211com *ic = ni->ni_ic;
+ const struct ieee80211_action *ia;
+ int chw;
+
+ ia = (const struct ieee80211_action *) frm;
+ switch (ia->ia_category) {
+ case IEEE80211_ACTION_CAT_BA:
+ IEEE80211_NOTE(ic,
+ IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
+ "%s: BA action %d not implemented", __func__,
+ ia->ia_action);
+ ic->ic_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(ic,
+ 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;
+ default:
+ IEEE80211_NOTE(ic,
+ IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
+ "%s: HT action %d not implemented", __func__,
+ ia->ia_action);
+ ic->ic_stats.is_rx_mgtdiscard++;
+ break;
+ }
+ break;
+ default:
+ IEEE80211_NOTE(ic,
+ IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
+ "%s: category %d not implemented", __func__,
+ ia->ia_category);
+ ic->ic_stats.is_rx_mgtdiscard++;
+ break;
+ }
+}
+
+/*
+ * Transmit processing.
+ */
+
+/*
+ * 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 */
+ /* XXX tap->txa_q */
+ callout_init(&tap->txa_timer, CALLOUT_MPSAFE);
+ tap->txa_flags |= IEEE80211_AGGR_SETUP;
+ }
+ if (tap->txa_attempts >= IEEE80211_AGGR_MAXTRIES &&
+ (ticks - tap->txa_lastrequest) < IEEE80211_AGGR_MINRETRY) {
+ /*
+ * Don't retry too often; IEEE80211_AGGR_MINRETRY
+ * defines the minimum interval we'll retry after
+ * IEEE80211_AGGR_MAXTRIES failed attempts to
+ * negotiate use.
+ */
+ return 0;
+ }
+ 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 */
+ args[3] = SM(0, IEEE80211_BASEQ_START)
+ | SM(0, IEEE80211_BASEQ_FRAG)
+ ;
+ /* 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 */
+ return 0;
+ }
+ tokens = dialogtoken; /* allocate token */
+ return ic->ic_send_action(ni, IEEE80211_ACTION_CAT_BA,
+ IEEE80211_ACTION_BA_ADDBA_REQUEST, args);
+}
+
+/*
+ * 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 { ic->ic_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 ieee80211com *ic = ni->ni_ic;
+ struct ifnet *ifp = ic->ic_ifp;
+ 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, ic->ic_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 *);
+
+ IEEE80211_NODE_STAT(ni, tx_mgmt); /* XXX tx_ctl? */
+
+ IEEE80211_DPRINTF(ic, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS,
+ "[%s] send bar frame (tid %u start %u) on channel %u\n",
+ ether_sprintf(ni->ni_macaddr), tid, tap->txa_start,
+ ieee80211_chan2ieee(ic, ic->ic_curchan));
+
+ m->m_pkthdr.rcvif = (void *)ni;
+ IF_ENQUEUE(&ic->ic_mgtq, m); /* cheat */
+ (*ifp->if_start)(ifp);
+
+ return 0;
+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 { ic->ic_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 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(ic, 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(ic,
+ IEEE80211_MSG_ACTION | IEEE80211_MSG_11N, ni,
+ "send ADDBA request: tid %d, baparamset 0x%x",
+ args[0], args[1]);
+
+ *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(ic,
+ 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(ic,
+ 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(ic,
+ IEEE80211_MSG_ACTION | IEEE80211_MSG_11N,
+ ni, "send HT txchwidth: width %d",
+ IEEE80211_IS_CHAN_HT40(ic->ic_bsschan) ? 40 : 20
+ );
+ *frm++ = IEEE80211_IS_CHAN_HT40(ic->ic_bsschan) ?
+ IEEE80211_A_HT_TXCHWIDTH_2040 :
+ IEEE80211_A_HT_TXCHWIDTH_20;
+ break;
+ default:
+ goto badaction;
+ }
+ break;
+ default:
+ badaction:
+ IEEE80211_NOTE(ic,
+ 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 *);
+
+ ret = ieee80211_mgmt_output(ic, ni, m, IEEE80211_FC0_SUBTYPE_ACTION);
+ if (ret != 0)
+ goto bad;
+ return 0;
+bad:
+ ieee80211_free_node(ni);
+ 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 ieee80211com *ic = ni->ni_ic;
+ uint16_t caps;
+
+ /* HT capabilities */
+ caps = ic->ic_htcaps & 0xffff;
+ /* override 20/40 use based on channel and config */
+ if (IEEE80211_IS_CHAN_HT40(ic->ic_bsschan) &&
+ (ic->ic_flags_ext & IEEE80211_FEXT_USEHT40))
+ caps |= IEEE80211_HTCAP_CHWIDTH40;
+ else
+ caps &= ~IEEE80211_HTCAP_CHWIDTH40;
+ /* adjust short GI based on channel and config */
+ if ((ic->ic_flags_ext & IEEE80211_FEXT_SHORTGI20) == 0)
+ caps &= ~IEEE80211_HTCAP_SHORTGI20;
+ if ((ic->ic_flags_ext & IEEE80211_FEXT_SHORTGI40) == 0 ||
+ (caps & IEEE80211_HTCAP_CHWIDTH40) == 0)
+ caps &= ~IEEE80211_HTCAP_SHORTGI40;
+ ADDSHORT(frm, caps);
+
+ /* HT parameters */
+ switch (ic->ic_ampdu_rxmax / 1024) {
+ case 8: *frm = IEEE80211_HTCAP_MAXRXAMPDU_8K; break;
+ case 16: *frm = IEEE80211_HTCAP_MAXRXAMPDU_16K; break;
+ case 32: *frm = IEEE80211_HTCAP_MAXRXAMPDU_32K; break;
+ default: *frm = IEEE80211_HTCAP_MAXRXAMPDU_64K; break;
+ }
+ *frm |= SM(ic->ic_ampdu_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 */
+ ieee80211_set_htrates(frm, &ni->ni_htrates);
+
+ 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);
+ }
+ }
+}
+
+/*
+ * Add body of an HTINFO information element.
+ */
+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, ic->ic_bsschan);
+
+ frm[0] = IEEE80211_HTINFO_RIFSMODE_PROH;
+ if (IEEE80211_IS_CHAN_HT40U(ic->ic_bsschan))
+ frm[0] |= IEEE80211_HTINFO_2NDCHAN_ABOVE;
+ else if (IEEE80211_IS_CHAN_HT40D(ic->ic_bsschan))
+ frm[0] |= IEEE80211_HTINFO_2NDCHAN_BELOW;
+ else
+ frm[0] |= IEEE80211_HTINFO_2NDCHAN_NONE;
+ if (IEEE80211_IS_CHAN_HT40(ic->ic_bsschan))
+ frm[0] |= IEEE80211_HTINFO_TXWIDTH_2040;
+
+ frm[1] = (ic->ic_flags_ext & IEEE80211_FEXT_PUREN) ?
+ IEEE80211_HTINFO_OPMODE_PURE : IEEE80211_HTINFO_OPMODE_MIXED;
+ /* XXX IEEE80211_HTINFO_NONHT_PRESENT */
+
+ 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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