/*- * 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 #ifdef __FreeBSD__ __FBSDID("$FreeBSD: head/sys/net80211/ieee80211_ht.c 170530 2007-06-11 03:36:55Z sam $"); #endif /* * IEEE 802.11n protocol support. */ #include "opt_inet.h" #include #include #include #include #include #include #include #include #include /* 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); }