mac80211: PS processing for every Beacon with our AID in TIM (30196673) · Commits · 戴 / test

If the AP includes our AID in the TIM IE, we need to process the Beacon frame as far as PS is concerned (send PS-Poll or nullfunc data with PM=0). The previous code skipped this in cases where the CRC value did not change and it would not change if the AP continues including our AID in the TIM.. There is no need to count the crc32 value for directed_tim with this change, so we can remove that part. In order not to change the order of operations (i.e., update WMM parameters prior to sending PS-Poll), the CRC match is checked twice as only after the PS processing step, the rest of the function is skipped if nothing changed in the Beacon. Signed-off-by:

Jouni Malinen <jouni.malinen@atheros.com> Signed-off-by:

John W. Linville <linville@tuxdriver.com>

net/mac80211/mlme.c

+10 −9

Original line number	Diff line number	Diff line
		@@ -1951,16 +1951,13 @@ static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
		directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
		ifmgd->aid);

		ncrc = crc32_be(ncrc, (void *)&directed_tim, sizeof(directed_tim));

		if (ncrc == ifmgd->beacon_crc)
		return;
		ifmgd->beacon_crc = ncrc;

		ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, true);
		if (ncrc != ifmgd->beacon_crc) {
		ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
		true);

		ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
		elems.wmm_param_len);
		}

		if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
		if (directed_tim) {
		@@ -1985,6 +1982,10 @@ static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
		}
		}

		if (ncrc == ifmgd->beacon_crc)
		return;
		ifmgd->beacon_crc = ncrc;

		if (elems.erp_info && elems.erp_info_len >= 1) {
		erp_valid = true;
		erp_value = elems.erp_info[0];

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