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Differential D48429 Diff 149741 sys/net80211/ieee80211_amrr.c

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sys/net80211/ieee80211_amrr.c

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{ {
KASSERT(nrefs > 0, ("imbalanced attach/detach")); KASSERT(nrefs > 0, ("imbalanced attach/detach"));
IEEE80211_FREE(vap->iv_rs, M_80211_RATECTL); IEEE80211_FREE(vap->iv_rs, M_80211_RATECTL);
vap->iv_rs = NULL; /* guard */ vap->iv_rs = NULL; /* guard */
nrefs--; /* XXX locking */ nrefs--; /* XXX locking */
} }
static void static void
amrr_node_init(struct ieee80211_node *ni) amrr_node_init_ht(struct ieee80211_node *ni)
{ {
const struct ieee80211_rateset *rs = NULL; const struct ieee80211_rateset *rs = NULL;
struct ieee80211_amrr_node *amn = ni->ni_rctls;
uint8_t rate; /* dot11rate */
/* Initial rate - lowest */
rate = rs->rs_rates[0];
bzUnsubmitted
Done
Inline Actions

Ok, this won't fly. rs is NULL. The line below initializes rs. This code was never run.

bz: Ok, this won't fly. rs is NULL. The line below initializes rs. This code was never run.
rs = (struct ieee80211_rateset *) &ni->ni_htrates;
/* Pick something low that's likely to succeed */
for (amn->amn_rix = rs->rs_nrates - 1; amn->amn_rix > 0;
amn->amn_rix--) {
/* 11n - stop at MCS4 */
if ((rs->rs_rates[amn->amn_rix] & 0x1f) < 4)
break;
}
rate = rs->rs_rates[amn->amn_rix] & IEEE80211_RATE_VAL;
/* Ensure the MCS bit is set */
rate |= IEEE80211_RATE_MCS;
/* Assign initial rate from the rateset */
ieee80211_node_set_txrate_dot11rate(ni, rate);
/* XXX TODO: we really need a rate-to-string method */
IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_RATECTL, ni,
"AMRR: nrates=%d, initial rate MCS %d",
rs->rs_nrates,
(rate & IEEE80211_RATE_VAL));
}
static void
amrr_node_init_legacy(struct ieee80211_node *ni)
{
const struct ieee80211_rateset *rs = NULL;
struct ieee80211_amrr_node *amn = ni->ni_rctls;
uint8_t rate; /* dot11rate */
/* Initial rate - lowest */
rate = rs->rs_rates[0];
bzUnsubmitted
Done
Inline Actions

And again here. rs is NULL. This is a NULL pointer deref.

bz: And again here. rs is NULL. This is a NULL pointer deref.
rs = &ni->ni_rates;
/* Clear the basic rate flag if it's not 11n */
rate &= IEEE80211_RATE_VAL;
/* Pick something low that's likely to succeed */
for (amn->amn_rix = rs->rs_nrates - 1; amn->amn_rix > 0;
amn->amn_rix--) {
/* legacy - anything < 36mbit, stop searching */
if ((rs->rs_rates[amn->amn_rix] &
IEEE80211_RATE_VAL) <= 72)
break;
}
rate = rs->rs_rates[amn->amn_rix] & IEEE80211_RATE_VAL;
/* Assign initial rate from the rateset */
ieee80211_node_set_txrate_dot11rate(ni, rate);
/* XXX TODO: we really need a rate-to-string method */
IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_RATECTL, ni,
"AMRR: nrates=%d, initial rate %d Mb",
rs->rs_nrates,
(rate & IEEE80211_RATE_VAL) / 2);
}
static void
amrr_node_init(struct ieee80211_node *ni)
{
struct ieee80211vap *vap = ni->ni_vap; struct ieee80211vap *vap = ni->ni_vap;
struct ieee80211_amrr *amrr = vap->iv_rs; struct ieee80211_amrr *amrr = vap->iv_rs;
struct ieee80211_amrr_node *amn; struct ieee80211_amrr_node *amn;
uint8_t rate;
if (!amrr) { if (!amrr) {
if_printf(vap->iv_ifp, "ratectl structure was not allocated, " if_printf(vap->iv_ifp, "ratectl structure was not allocated, "
"per-node structure allocation skipped\n"); "per-node structure allocation skipped\n");
return; return;
} }
if (ni->ni_rctls == NULL) { if (ni->ni_rctls == NULL) {
ni->ni_rctls = amn = IEEE80211_MALLOC(sizeof(struct ieee80211_amrr_node), ni->ni_rctls = amn = IEEE80211_MALLOC(sizeof(struct ieee80211_amrr_node),
M_80211_RATECTL, IEEE80211_M_NOWAIT | IEEE80211_M_ZERO); M_80211_RATECTL, IEEE80211_M_NOWAIT | IEEE80211_M_ZERO);
if (amn == NULL) { if (amn == NULL) {
if_printf(vap->iv_ifp, "couldn't alloc per-node ratectl " if_printf(vap->iv_ifp, "couldn't alloc per-node ratectl "
"structure\n"); "structure\n");
return; return;
} }
} else } else
amn = ni->ni_rctls; amn = ni->ni_rctls;
/* Common state */
amn->amn_amrr = amrr; amn->amn_amrr = amrr;
amn->amn_success = 0; amn->amn_success = 0;
amn->amn_recovery = 0; amn->amn_recovery = 0;
amn->amn_txcnt = amn->amn_retrycnt = 0; amn->amn_txcnt = amn->amn_retrycnt = 0;
amn->amn_success_threshold = amrr->amrr_min_success_threshold; amn->amn_success_threshold = amrr->amrr_min_success_threshold;
amn->amn_ticks = ticks;
/* 11n or not? Pick the right rateset */ /* 11n or not? Pick the right rateset */
if (ieee80211_ht_check_tx_ht(ni)) {
/* XXX ew */
IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_RATECTL, ni,
"%s: 11n node", __func__);
rs = (struct ieee80211_rateset *) &ni->ni_htrates;
} else {
IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_RATECTL, ni,
"%s: non-11n node", __func__);
rs = &ni->ni_rates;
}
/* Initial rate - lowest */
rate = rs->rs_rates[0];
/* XXX clear the basic rate flag if it's not 11n */
if (! ieee80211_ht_check_tx_ht(ni))
rate &= IEEE80211_RATE_VAL;
/* pick initial rate from the rateset - HT or otherwise */
/* Pick something low that's likely to succeed */
for (amn->amn_rix = rs->rs_nrates - 1; amn->amn_rix > 0;
amn->amn_rix--) {
/* legacy - anything < 36mbit, stop searching */
/* 11n - stop at MCS4 */
if (ieee80211_ht_check_tx_ht(ni)) {
if ((rs->rs_rates[amn->amn_rix] & 0x1f) < 4)
break;
} else if ((rs->rs_rates[amn->amn_rix] & IEEE80211_RATE_VAL) <= 72)
break;
}
rate = rs->rs_rates[amn->amn_rix] & IEEE80211_RATE_VAL;
/* if the rate is an 11n rate, ensure the MCS bit is set */
if (ieee80211_ht_check_tx_ht(ni)) if (ieee80211_ht_check_tx_ht(ni))
rate |= IEEE80211_RATE_MCS; amrr_node_init_ht(ni);
else
/* Assign initial rate from the rateset */ amrr_node_init_legacy(ni);
ieee80211_node_set_txrate_dot11rate(ni, rate);
amn->amn_ticks = ticks;
/* XXX TODO: we really need a rate-to-string method */
/* XXX TODO: non-11n rate should be divided by two.. */
IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_RATECTL, ni,
"AMRR: nrates=%d, initial rate %s%d",
rs->rs_nrates,
ieee80211_ht_check_tx_ht(ni) ? "MCS " : "",
rate & IEEE80211_RATE_VAL);
} }
static void static void
amrr_node_deinit(struct ieee80211_node *ni) amrr_node_deinit(struct ieee80211_node *ni)
{ {
IEEE80211_FREE(ni->ni_rctls, M_80211_RATECTL); IEEE80211_FREE(ni->ni_rctls, M_80211_RATECTL);
} }
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