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freebsd-dev/sys/net80211/ieee80211_ht.c
Sam Leffler eddedabe31 Miscellaneous fixups to 802.11 defs: 
o update 11n definitions to D2.0 spec
o add IEEE80211_CAPINFO_SPECTRUM_MGMT for DFS support
o add CSA ie definition for DFS support
o purge some unused definitions
o correct 802.11 reason and status codes
o correct reason code returned when a sta tries to associate to an
  ap operating with WPA/RSN but without a WPA/RSN ie

Reviewed by:	thompsa, avatar
Approved by:	re (blanket wireless)
2007-09-05 20:29:51 +00:00

1473 lines
41 KiB
C
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/*-
* 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_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);
/* 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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