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Revamp ht ie handling:

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o change ieee80211_parse_htcap and ieee80211_parse_htinfo to save only
  internal state obtained from the ie's; no dynamic state such as
  ni_chw is altered
o add ieee80211_ht_updateparams to parse ht cap+info ie's and update
  dynamic node state
o change ieee80211_ht_node_init to not take an htcap ie that is parsed;
  instead have the caller make a separate call as one caller wants to
  parse the ie while another wants to parse both cap+info ie's and
  update state so can better do this with ieee80211_ht_updateparams

These changes fix sta mode state handling where the node's channel
width was shifted to ht20/ht40 prematurely.
This commit is contained in:
Sam Leffler 2008-09-21 23:44:15 +00:00
parent bd985970b6
commit fdabd982e7
4 changed files with 110 additions and 49 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
sys/net80211/ieee80211_hostap.c
View File

@ -2038,7 +2038,8 @@ hostap_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0,
vap->iv_stats.is_ht_assoc_norate++;
return;
}
ieee80211_ht_node_init(ni, htcap);
ieee80211_ht_node_init(ni);
ieee80211_ht_updatehtcap(ni, htcap);
} else if (ni->ni_flags & IEEE80211_NODE_HT)
ieee80211_ht_node_cleanup(ni);
/*

132
sys/net80211/ieee80211_ht.c
View File

@ -783,7 +783,7 @@ ieee80211_recv_bar(struct ieee80211_node *ni, struct mbuf *m0)
* work for temporary and/or legacy sta's.
*/
void
ieee80211_ht_node_init(struct ieee80211_node *ni, const uint8_t *htcap)
ieee80211_ht_node_init(struct ieee80211_node *ni)
{
struct ieee80211_tx_ampdu *tap;
int ac;
@ -796,7 +796,6 @@ ieee80211_ht_node_init(struct ieee80211_node *ni, const uint8_t *htcap)
*/
ieee80211_ht_node_cleanup(ni);
}
ieee80211_parse_htcap(ni, htcap);
for (ac = 0; ac < WME_NUM_AC; ac++) {
tap = &ni->ni_tx_ampdu[ac];
tap->txa_ac = ac;
@ -1146,8 +1145,6 @@ ieee80211_ht_timeout(struct ieee80211com *ic)
void
ieee80211_parse_htcap(struct ieee80211_node *ni, const uint8_t *ie)
{
struct ieee80211vap *vap = ni->ni_vap;
if (ie[0] == IEEE80211_ELEMID_VENDOR) {
/*
* Station used Vendor OUI ie to associate;
@ -1162,55 +1159,54 @@ ieee80211_parse_htcap(struct ieee80211_node *ni, const uint8_t *ie)
ni->ni_htcap = LE_READ_2(ie +
__offsetof(struct ieee80211_ie_htcap, hc_cap));
ni->ni_htparam = ie[__offsetof(struct ieee80211_ie_htcap, hc_param)];
/* XXX needed or will ieee80211_parse_htinfo always be called? */
ni->ni_chw = (ni->ni_htcap & IEEE80211_HTCAP_CHWIDTH40) &&
(vap->iv_flags_ext & IEEE80211_FEXT_USEHT40) ? 40 : 20;
}
/*
* Process an 802.11n HT info ie and update the node state.
* Note that we handle use this information to identify the
* correct channel (HT20, HT40+, HT40-, legacy). The caller
* is responsible for insuring any required channel change is
* done (e.g. in sta mode when parsing the contents of a
* beacon frame).
*/
void
ieee80211_parse_htinfo(struct ieee80211_node *ni, const uint8_t *ie)
static void
htinfo_parse(struct ieee80211_node *ni,
const struct ieee80211_ie_htinfo *htinfo)
{
struct ieee80211com *ic = ni->ni_ic;
struct ieee80211vap *vap = ni->ni_vap;
const struct ieee80211_ie_htinfo *htinfo;
struct ieee80211_channel *c;
uint16_t w;
int htflags, chanflags;
if (ie[0] == IEEE80211_ELEMID_VENDOR)
ie += 4;
htinfo = (const struct ieee80211_ie_htinfo *) ie;
ni->ni_htctlchan = htinfo->hi_ctrlchannel;
ni->ni_ht2ndchan = SM(htinfo->hi_byte1, IEEE80211_HTINFO_2NDCHAN);
w = LE_READ_2(&htinfo->hi_byte2);
ni->ni_htopmode = SM(w, IEEE80211_HTINFO_OPMODE);
w = LE_READ_2(&htinfo->hi_byte45);
ni->ni_htstbc = SM(w, IEEE80211_HTINFO_BASIC_STBCMCS);
/*
}
/*
* Parse an 802.11n HT info ie and save useful information
* to the node state. Note this does not effect any state
* changes such as for channel width change.
*/
void
ieee80211_parse_htinfo(struct ieee80211_node *ni, const uint8_t *ie)
{
if (ie[0] == IEEE80211_ELEMID_VENDOR)
ie += 4;
htinfo_parse(ni, (const struct ieee80211_ie_htinfo *) ie);
}
/*
* Handle 11n channel switch. Use the received HT ie's to
* identify the right channel to use. If we cannot locate it
* in the channel table then fallback to legacy operation.
* Note that we use this information to identify the node's
* channel only; the caller is responsible for insuring any
* required channel change is done (e.g. in sta mode when
* parsing the contents of a beacon frame).
*/
/* NB: honor operating mode constraint */
htflags = (vap->iv_flags_ext & IEEE80211_FEXT_HT) ?
IEEE80211_CHAN_HT20 : 0;
if ((htinfo->hi_byte1 & IEEE80211_HTINFO_TXWIDTH_2040) &&
(vap->iv_flags_ext & IEEE80211_FEXT_USEHT40)) {
if (ni->ni_ht2ndchan == IEEE80211_HTINFO_2NDCHAN_ABOVE)
htflags = IEEE80211_CHAN_HT40U;
else if (ni->ni_ht2ndchan == IEEE80211_HTINFO_2NDCHAN_BELOW)
htflags = IEEE80211_CHAN_HT40D;
}
static void
htinfo_update_chw(struct ieee80211_node *ni, int htflags)
{
struct ieee80211com *ic = ni->ni_ic;
struct ieee80211_channel *c;
int chanflags;
chanflags = (ni->ni_chan->ic_flags &~ IEEE80211_CHAN_HT) | htflags;
if (chanflags != ni->ni_chan->ic_flags) {
/* XXX not right for ht40- */
c = ieee80211_find_channel(ic, ni->ni_chan->ic_freq, chanflags);
if (c == NULL && (htflags & IEEE80211_CHAN_HT40)) {
/*
@ -1218,14 +1214,16 @@ ieee80211_parse_htinfo(struct ieee80211_node *ni, const uint8_t *ie)
* to HT20 operation. This should not happen.
*/
c = findhtchan(ic, ni->ni_chan, IEEE80211_CHAN_HT20);
IEEE80211_NOTE(vap,
#if 0
IEEE80211_NOTE(ni->ni_vap,
IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, ni,
"no HT40 channel (freq %u), falling back to HT20",
ni->ni_chan->ic_freq);
#endif
/* XXX stat */
}
if (c != NULL && c != ni->ni_chan) {
IEEE80211_NOTE(vap,
IEEE80211_NOTE(ni->ni_vap,
IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, ni,
"switch station to HT%d channel %u/0x%x",
IEEE80211_IS_CHAN_HT40(c) ? 40 : 20,
@ -1238,6 +1236,64 @@ ieee80211_parse_htinfo(struct ieee80211_node *ni, const uint8_t *ie)
ni->ni_chw = IEEE80211_IS_CHAN_HT40(ni->ni_chan)? 40 : 20;
}
/*
* Parse and update HT-related state extracted from
* the HT cap and info ie's.
*/
void
ieee80211_ht_updateparams(struct ieee80211_node *ni,
const uint8_t *htcapie, const uint8_t *htinfoie)
{
struct ieee80211vap *vap = ni->ni_vap;
const struct ieee80211_ie_htinfo *htinfo;
int htflags;
ieee80211_parse_htcap(ni, htcapie);
if (htinfoie[0] == IEEE80211_ELEMID_VENDOR)
htinfoie += 4;
htinfo = (const struct ieee80211_ie_htinfo *) htinfoie;
htinfo_parse(ni, htinfo);
htflags = (vap->iv_flags_ext & IEEE80211_FEXT_HT) ?
IEEE80211_CHAN_HT20 : 0;
/* NB: honor operating mode constraint */
if ((htinfo->hi_byte1 & IEEE80211_HTINFO_TXWIDTH_2040) &&
(vap->iv_flags_ext & IEEE80211_FEXT_USEHT40)) {
if (ni->ni_ht2ndchan == IEEE80211_HTINFO_2NDCHAN_ABOVE)
htflags = IEEE80211_CHAN_HT40U;
else if (ni->ni_ht2ndchan == IEEE80211_HTINFO_2NDCHAN_BELOW)
htflags = IEEE80211_CHAN_HT40D;
}
htinfo_update_chw(ni, htflags);
}
/*
* Parse and update HT-related state extracted from the HT cap ie
* for a station joining an HT BSS.
*/
void
ieee80211_ht_updatehtcap(struct ieee80211_node *ni, const uint8_t *htcapie)
{
struct ieee80211vap *vap = ni->ni_vap;
int htflags;
ieee80211_parse_htcap(ni, htcapie);
/* NB: honor operating mode constraint */
/* XXX 40 MHZ intolerant */
htflags = (vap->iv_flags_ext & IEEE80211_FEXT_HT) ?
IEEE80211_CHAN_HT20 : 0;
if ((ni->ni_htcap & IEEE80211_HTCAP_CHWIDTH40) &&
(vap->iv_flags_ext & IEEE80211_FEXT_USEHT40)) {
if (IEEE80211_IS_CHAN_HT40U(vap->iv_bss->ni_chan))
htflags = IEEE80211_CHAN_HT40U;
else if (IEEE80211_IS_CHAN_HT40D(vap->iv_bss->ni_chan))
htflags = IEEE80211_CHAN_HT40D;
}
htinfo_update_chw(ni, htflags);
}
/*
* Install received HT rate set by parsing the HT cap ie.
*/

5
sys/net80211/ieee80211_ht.h
View File

@ -165,7 +165,7 @@ void ieee80211_setup_basic_htrates(struct ieee80211_node *,
struct mbuf *ieee80211_decap_amsdu(struct ieee80211_node *, struct mbuf *);
int ieee80211_ampdu_reorder(struct ieee80211_node *, struct mbuf *);
void ieee80211_recv_bar(struct ieee80211_node *, struct mbuf *);
void ieee80211_ht_node_init(struct ieee80211_node *, const uint8_t *);
void ieee80211_ht_node_init(struct ieee80211_node *);
void ieee80211_ht_node_cleanup(struct ieee80211_node *);
void ieee80211_ht_node_age(struct ieee80211_node *);
@ -178,6 +178,9 @@ void ieee80211_htprot_update(struct ieee80211com *, int protmode);
void ieee80211_ht_timeout(struct ieee80211com *);
void ieee80211_parse_htcap(struct ieee80211_node *, const uint8_t *);
void ieee80211_parse_htinfo(struct ieee80211_node *, const uint8_t *);
void ieee80211_ht_updateparams(struct ieee80211_node *, const uint8_t *,
const uint8_t *);
void ieee80211_ht_updatehtcap(struct ieee80211_node *, const uint8_t *);
void ieee80211_recv_action(struct ieee80211_node *,
const uint8_t *, const uint8_t *);
int ieee80211_ampdu_request(struct ieee80211_node *,

11
sys/net80211/ieee80211_sta.c
View File

@ -1268,9 +1268,10 @@ sta_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0,
ieee80211_wme_updateparams(vap);
if (scan.ath != NULL)
ieee80211_parse_athparams(ni, scan.ath, wh);
if (scan.htcap != NULL && scan.htinfo != NULL) {
ieee80211_parse_htcap(ni, scan.htcap);
ieee80211_parse_htinfo(ni, scan.htinfo);
if (scan.htcap != NULL && scan.htinfo != NULL &&
(vap->iv_flags_ext & IEEE80211_FEXT_HT)) {
ieee80211_ht_updateparams(ni,
scan.htcap, scan.htinfo);
/* XXX state changes? */
}
if (scan.tim != NULL) {
@ -1503,8 +1504,8 @@ sta_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0,
*/
if (htcap != NULL && htinfo != NULL &&
(vap->iv_flags_ext & IEEE80211_FEXT_HT)) {
ieee80211_ht_node_init(ni, htcap);
ieee80211_parse_htinfo(ni, htinfo);
ieee80211_ht_node_init(ni);
ieee80211_ht_updateparams(ni, htcap, htinfo);
ieee80211_setup_htrates(ni, htcap,
IEEE80211_F_JOIN | IEEE80211_F_DOBRS);
ieee80211_setup_basic_htrates(ni, htinfo);