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mac80211: extend ieee80211_ie_split to support EXTENSION

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Current ieee80211_ie_split() implementation doesn't
account for elements that are sub-elements of the
EXTENSION IE. To extend support to these IEs as well,
treat the WLAN_EID_EXTENSION ids in the %ids array
as indicating that the next id in the array is a
sub-element of the EXTENSION IE.

Signed-off-by: Liad Kaufman <liad.kaufman@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Liad Kaufman 2017-08-05 11:44:31 +03:00 • committed by Johannes Berg
parent 79af1f8661
commit 2512b1b18d
2 changed files with 50 additions and 10 deletions
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6
include/net/cfg80211.h
View file

@ -5934,7 +5934,8 @@ int cfg80211_get_p2p_attr(const u8 *ies, unsigned int len,
* @ies: the IE buffer * @ies: the IE buffer
* @ielen: the length of the IE buffer * @ielen: the length of the IE buffer
* @ids: an array with element IDs that are allowed before * @ids: an array with element IDs that are allowed before
* the split * the split. A WLAN_EID_EXTENSION value means that the next
* EID in the list is a sub-element of the EXTENSION IE.
* @n_ids: the size of the element ID array * @n_ids: the size of the element ID array
* @after_ric: array IE types that come after the RIC element * @after_ric: array IE types that come after the RIC element
* @n_after_ric: size of the @after_ric array * @n_after_ric: size of the @after_ric array
@ -5965,7 +5966,8 @@ size_t ieee80211_ie_split_ric(const u8 *ies, size_t ielen,
* @ies: the IE buffer * @ies: the IE buffer
* @ielen: the length of the IE buffer * @ielen: the length of the IE buffer
* @ids: an array with element IDs that are allowed before * @ids: an array with element IDs that are allowed before
* the split * the split. A WLAN_EID_EXTENSION value means that the next
* EID in the list is a sub-element of the EXTENSION IE.
* @n_ids: the size of the element ID array * @n_ids: the size of the element ID array
* @offset: offset where to start splitting in the buffer * @offset: offset where to start splitting in the buffer
* *

54
net/wireless/util.c
View file

@ -1367,13 +1367,29 @@ int cfg80211_get_p2p_attr(const u8 *ies, unsigned int len,
} }
EXPORT_SYMBOL(cfg80211_get_p2p_attr); EXPORT_SYMBOL(cfg80211_get_p2p_attr);
static bool ieee80211_id_in_list(const u8 *ids, int n_ids, u8 id) static bool ieee80211_id_in_list(const u8 *ids, int n_ids, u8 id, bool id_ext)
{ {
int i; int i;
for (i = 0; i < n_ids; i++) /* Make sure array values are legal */
if (ids[i] == id) if (WARN_ON(ids[n_ids - 1] == WLAN_EID_EXTENSION))
return false;
i = 0;
while (i < n_ids) {
if (ids[i] == WLAN_EID_EXTENSION) {
if (id_ext && (ids[i + 1] == id))
return true;
i += 2;
continue;
}
if (ids[i] == id && !id_ext)
return true; return true;
i++;
}
return false; return false;
} }
@ -1403,14 +1419,36 @@ size_t ieee80211_ie_split_ric(const u8 *ies, size_t ielen,
{ {
size_t pos = offset; size_t pos = offset;
while (pos < ielen && ieee80211_id_in_list(ids, n_ids, ies[pos])) { while (pos < ielen) {
u8 ext = 0;
if (ies[pos] == WLAN_EID_EXTENSION)
ext = 2;
if ((pos + ext) >= ielen)
break;
if (!ieee80211_id_in_list(ids, n_ids, ies[pos + ext],
ies[pos] == WLAN_EID_EXTENSION))
break;
if (ies[pos] == WLAN_EID_RIC_DATA && n_after_ric) { if (ies[pos] == WLAN_EID_RIC_DATA && n_after_ric) {
pos = skip_ie(ies, ielen, pos); pos = skip_ie(ies, ielen, pos);
while (pos < ielen && while (pos < ielen) {
!ieee80211_id_in_list(after_ric, n_after_ric, if (ies[pos] == WLAN_EID_EXTENSION)
ies[pos])) ext = 2;
pos = skip_ie(ies, ielen, pos); else
ext = 0;
if ((pos + ext) >= ielen)
break;
if (!ieee80211_id_in_list(after_ric,
n_after_ric,
ies[pos + ext],
ext == 2))
pos = skip_ie(ies, ielen, pos);
}
} else { } else {
pos = skip_ie(ies, ielen, pos); pos = skip_ie(ies, ielen, pos);
} }