Commit 8e664fb3 authored by Johannes Berg's avatar Johannes Berg Committed by John W. Linville
Browse files

mac80211: split up and insert custom IEs correctly 



Currently, we insert all user-specified IEs before the HT
IE for association, and after the HT IE for probe requests.
For association, that's correct only if the user-specified
IEs are RSN only, incorrect in all other cases including
WPA. Change this to split apart the user-specified IEs in
two places for association: before the HT IE (e.g. RSN),
after the HT IE (generally empty right now I think?) and
after WMM (all other vendor-specific IEs). For probes,
split the IEs in different places to be correct according
to the spec.

Signed-off-by: default avatarJohannes Berg <johannes@sipsolutions.net>
Signed-off-by: default avatarJohn W. Linville <linville@tuxdriver.com>
parent 77c8144a

include/linux/ieee80211.h

+30 −9
Original line number Diff line number Diff line
@@ -1085,12 +1085,12 @@ enum ieee80211_eid { 
	WLAN_EID_TIM = 5,

	WLAN_EID_IBSS_PARAMS = 6,

	WLAN_EID_CHALLENGE = 16,

	/* 802.11d */



	WLAN_EID_COUNTRY = 7,

	WLAN_EID_HP_PARAMS = 8,

	WLAN_EID_HP_TABLE = 9,

	WLAN_EID_REQUEST = 10,

	/* 802.11e */



	WLAN_EID_QBSS_LOAD = 11,

	WLAN_EID_EDCA_PARAM_SET = 12,

	WLAN_EID_TSPEC = 13,
@@ -1113,7 +1113,7 @@ enum ieee80211_eid { 
	WLAN_EID_PREP = 69,

	WLAN_EID_PERR = 70,

	WLAN_EID_RANN = 49,	/* compatible with FreeBSD */

	/* 802.11h */



	WLAN_EID_PWR_CONSTRAINT = 32,

	WLAN_EID_PWR_CAPABILITY = 33,

	WLAN_EID_TPC_REQUEST = 34,
@@ -1124,20 +1124,41 @@ enum ieee80211_eid { 
	WLAN_EID_MEASURE_REPORT = 39,

	WLAN_EID_QUIET = 40,

	WLAN_EID_IBSS_DFS = 41,

	/* 802.11g */



	WLAN_EID_ERP_INFO = 42,

	WLAN_EID_EXT_SUPP_RATES = 50,

	/* 802.11n */



	WLAN_EID_HT_CAPABILITY = 45,

	WLAN_EID_HT_INFORMATION = 61,

	/* 802.11i */



	WLAN_EID_RSN = 48,

	WLAN_EID_TIMEOUT_INTERVAL = 56,

	WLAN_EID_MMIE = 76 /* 802.11w */,

	WLAN_EID_MMIE = 76,

	WLAN_EID_WPA = 221,

	WLAN_EID_GENERIC = 221,

	WLAN_EID_VENDOR_SPECIFIC = 221,

	WLAN_EID_QOS_PARAMETER = 222

	WLAN_EID_QOS_PARAMETER = 222,



	WLAN_EID_AP_CHAN_REPORT = 51,

	WLAN_EID_NEIGHBOR_REPORT = 52,

	WLAN_EID_RCPI = 53,

	WLAN_EID_BSS_AVG_ACCESS_DELAY = 63,

	WLAN_EID_ANTENNA_INFO = 64,

	WLAN_EID_RSNI = 65,

	WLAN_EID_MEASUREMENT_PILOT_TX_INFO = 66,

	WLAN_EID_BSS_AVAILABLE_CAPACITY = 67,

	WLAN_EID_BSS_AC_ACCESS_DELAY = 68,

	WLAN_EID_RRM_ENABLED_CAPABILITIES = 70,

	WLAN_EID_MULTIPLE_BSSID = 71,



	WLAN_EID_MOBILITY_DOMAIN = 54,

	WLAN_EID_FAST_BSS_TRANSITION = 55,

	WLAN_EID_TIMEOUT_INTERVAL = 56,

	WLAN_EID_RIC_DATA = 57,

	WLAN_EID_RIC_DESCRIPTOR = 75,



	WLAN_EID_DSE_REGISTERED_LOCATION = 58,

	WLAN_EID_SUPPORTED_REGULATORY_CLASSES = 59,

	WLAN_EID_EXT_CHANSWITCH_ANN = 60,

};



/* Action category code */

net/mac80211/ieee80211_i.h

+4 −0
Original line number Diff line number Diff line
@@ -1148,6 +1148,10 @@ int __ieee80211_request_smps(struct ieee80211_sub_if_data *sdata, 
void ieee80211_recalc_smps(struct ieee80211_local *local,

			   struct ieee80211_sub_if_data *forsdata);



size_t ieee80211_ie_split(const u8 *ies, size_t ielen,

			  const u8 *ids, int n_ids, size_t offset);

size_t ieee80211_ie_split_vendor(const u8 *ies, size_t ielen, size_t offset);



/* internal work items */

void ieee80211_work_init(struct ieee80211_local *local);

void ieee80211_add_work(struct ieee80211_work *wk);

net/mac80211/util.c

+114 −20
Original line number Diff line number Diff line
@@ -881,30 +881,66 @@ int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer, 
			     enum ieee80211_band band)

{

	struct ieee80211_supported_band *sband;

	u8 *pos, *supp_rates_len, *esupp_rates_len = NULL;

	int i;

	u8 *pos;

	size_t offset = 0, noffset;

	int supp_rates_len, i;



	sband = local->hw.wiphy->bands[band];



	pos = buffer;



	*pos++ = WLAN_EID_SUPP_RATES;

	supp_rates_len = pos;

	*pos++ = 0;



	for (i = 0; i < sband->n_bitrates; i++) {

		struct ieee80211_rate *rate = &sband->bitrates[i];

	supp_rates_len = min_t(int, sband->n_bitrates, 8);



		if (esupp_rates_len) {

			*esupp_rates_len += 1;

		} else if (*supp_rates_len == 8) {

	*pos++ = WLAN_EID_SUPP_RATES;

	*pos++ = supp_rates_len;



	for (i = 0; i < supp_rates_len; i++) {

		int rate = sband->bitrates[i].bitrate;

		*pos++ = (u8) (rate / 5);

	}



	/* insert "request information" if in custom IEs */

	if (ie && ie_len) {

		static const u8 before_extrates[] = {

			WLAN_EID_SSID,

			WLAN_EID_SUPP_RATES,

			WLAN_EID_REQUEST,

		};

		noffset = ieee80211_ie_split(ie, ie_len,

					     before_extrates,

					     ARRAY_SIZE(before_extrates),

					     offset);

		memcpy(pos, ie + offset, noffset - offset);

		pos += noffset - offset;

		offset = noffset;

	}



	if (sband->n_bitrates > i) {

		*pos++ = WLAN_EID_EXT_SUPP_RATES;

			esupp_rates_len = pos;

			*pos++ = 1;

		} else

			*supp_rates_len += 1;

		*pos++ = sband->n_bitrates - i;



		for (; i < sband->n_bitrates; i++) {

			int rate = sband->bitrates[i].bitrate;

			*pos++ = (u8) (rate / 5);

		}

	}



		*pos++ = rate->bitrate / 5;

	/* insert custom IEs that go before HT */

	if (ie && ie_len) {

		static const u8 before_ht[] = {

			WLAN_EID_SSID,

			WLAN_EID_SUPP_RATES,

			WLAN_EID_REQUEST,

			WLAN_EID_EXT_SUPP_RATES,

			WLAN_EID_DS_PARAMS,

			WLAN_EID_SUPPORTED_REGULATORY_CLASSES,

		};

		noffset = ieee80211_ie_split(ie, ie_len,

					     before_ht, ARRAY_SIZE(before_ht),

					     offset);

		memcpy(pos, ie + offset, noffset - offset);

		pos += noffset - offset;

		offset = noffset;

	}



	if (sband->ht_cap.ht_supported) {
@@ -936,9 +972,11 @@ int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer, 
	 * that calculates local->scan_ies_len.

	 */



	if (ie) {

		memcpy(pos, ie, ie_len);

		pos += ie_len;

	/* add any remaining custom IEs */

	if (ie && ie_len) {

		noffset = ie_len;

		memcpy(pos, ie + offset, noffset - offset);

		pos += noffset - offset;

	}



	return pos - buffer;
@@ -1252,3 +1290,59 @@ void ieee80211_recalc_smps(struct ieee80211_local *local, 
	/* changed flag is auto-detected for this */

	ieee80211_hw_config(local, 0);

}



static bool ieee80211_id_in_list(const u8 *ids, int n_ids, u8 id)

{

	int i;



	for (i = 0; i < n_ids; i++)

		if (ids[i] == id)

			return true;

	return false;

}



/**

 * ieee80211_ie_split - split an IE buffer according to ordering

 *

 * @ies: the IE buffer

 * @ielen: the length of the IE buffer

 * @ids: an array with element IDs that are allowed before

 *	the split

 * @n_ids: the size of the element ID array

 * @offset: offset where to start splitting in the buffer

 *

 * This function splits an IE buffer by updating the @offset

 * variable to point to the location where the buffer should be

 * split.

 *

 * It assumes that the given IE buffer is well-formed, this

 * has to be guaranteed by the caller!

 *

 * It also assumes that the IEs in the buffer are ordered

 * correctly, if not the result of using this function will not

 * be ordered correctly either, i.e. it does no reordering.

 *

 * The function returns the offset where the next part of the

 * buffer starts, which may be @ielen if the entire (remainder)

 * of the buffer should be used.

 */

size_t ieee80211_ie_split(const u8 *ies, size_t ielen,

			  const u8 *ids, int n_ids, size_t offset)

{

	size_t pos = offset;



	while (pos < ielen && ieee80211_id_in_list(ids, n_ids, ies[pos]))

		pos += 2 + ies[pos + 1];



	return pos;

}



size_t ieee80211_ie_split_vendor(const u8 *ies, size_t ielen, size_t offset)

{

	size_t pos = offset;



	while (pos < ielen && ies[pos] != WLAN_EID_VENDOR_SPECIFIC)

		pos += 2 + ies[pos + 1];



	return pos;

}

net/mac80211/work.c

+36 −7
Original line number Diff line number Diff line
@@ -204,6 +204,7 @@ static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata, 
	struct ieee80211_mgmt *mgmt;

	u8 *pos;

	const u8 *ies;

	size_t offset = 0, noffset;

	int i, len, count, rates_len, supp_rates_len;

	u16 capab;

	struct ieee80211_supported_band *sband;
@@ -337,14 +338,26 @@ static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata, 
		}

	}



	/*

	 * XXX:	These IEs could contain (vendor-specified)

	 *	IEs that belong after HT -- the buffer may

	 *	need to be split up.

	 */

	/* if present, add any custom IEs that go before HT */

	if (wk->ie_len && wk->ie) {

		pos = skb_put(skb, wk->ie_len);

		memcpy(pos, wk->ie, wk->ie_len);

		static const u8 before_ht[] = {

			WLAN_EID_SSID,

			WLAN_EID_SUPP_RATES,

			WLAN_EID_EXT_SUPP_RATES,

			WLAN_EID_PWR_CAPABILITY,

			WLAN_EID_SUPPORTED_CHANNELS,

			WLAN_EID_RSN,

			WLAN_EID_QOS_CAPA,

			WLAN_EID_RRM_ENABLED_CAPABILITIES,

			WLAN_EID_MOBILITY_DOMAIN,

			WLAN_EID_SUPPORTED_REGULATORY_CLASSES,

		};

		noffset = ieee80211_ie_split(wk->ie, wk->ie_len,

					     before_ht, ARRAY_SIZE(before_ht),

					     offset);

		pos = skb_put(skb, noffset - offset);

		memcpy(pos, wk->ie + offset, noffset - offset);

		offset = noffset;

	}



	if (wk->assoc.use_11n && wk->assoc.wmm_used &&
@@ -352,6 +365,15 @@ static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata, 
		ieee80211_add_ht_ie(skb, wk->assoc.ht_information_ie,

				    sband, wk->chan, wk->assoc.smps);



	/* if present, add any custom non-vendor IEs that go after HT */

	if (wk->ie_len && wk->ie) {

		noffset = ieee80211_ie_split_vendor(wk->ie, wk->ie_len,

						    offset);

		pos = skb_put(skb, noffset - offset);

		memcpy(pos, wk->ie + offset, noffset - offset);

		offset = noffset;

	}



	if (wk->assoc.wmm_used && local->hw.queues >= 4) {

		pos = skb_put(skb, 9);

		*pos++ = WLAN_EID_VENDOR_SPECIFIC;
@@ -365,6 +387,13 @@ static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata, 
		*pos++ = 0;

	}



	/* add any remaining custom (i.e. vendor specific here) IEs */

	if (wk->ie_len && wk->ie) {

		noffset = wk->ie_len;

		pos = skb_put(skb, noffset - offset);

		memcpy(pos, wk->ie + offset, noffset - offset);

	}



	IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;

	ieee80211_tx_skb(sdata, skb);

}

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