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cfg80211: add cfg80211_find_vendor_ie() function

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Add function to find vendor-specific ie (along with
vendor-specific ie struct definition and P2P OUI values)

Signed-off-by: Eliad Peller <eliad@wizery.com>
Reviewed-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Eliad Peller 2011-09-15 11:53:01 +03:00 committed by John W. Linville
parent 6e82bc4a5b
commit 0c28ec587a
3 changed files with 55 additions and 0 deletions
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10
include/linux/ieee80211.h
View File

@ -777,6 +777,13 @@ struct ieee80211_mmie {
u8 mic[8];
} __attribute__ ((packed));
struct ieee80211_vendor_ie {
u8 element_id;
u8 len;
u8 oui[3];
u8 oui_type;
} __packed;
/* Control frames */
struct ieee80211_rts {
__le16 frame_control;
@ -1470,6 +1477,9 @@ enum ieee80211_sa_query_action {
#define WLAN_PMKID_LEN 16
#define WLAN_OUI_WFA 0x506f9a
#define WLAN_OUI_TYPE_WFA_P2P 9
/*
* WMM/802.11e Tspec Element
*/

18
include/net/cfg80211.h
View File

@ -2458,6 +2458,24 @@ unsigned int cfg80211_classify8021d(struct sk_buff *skb);
*/
const u8 *cfg80211_find_ie(u8 eid, const u8 *ies, int len);
/**
* cfg80211_find_vendor_ie - find vendor specific information element in data
*
* @oui: vendor OUI
* @oui_type: vendor-specific OUI type
* @ies: data consisting of IEs
* @len: length of data
*
* This function will return %NULL if the vendor specific element ID
* could not be found or if the element is invalid (claims to be
* longer than the given data), or a pointer to the first byte
* of the requested element, that is the byte containing the
* element ID. There are no checks on the element length
* other than having to fit into the given data.
*/
const u8 *cfg80211_find_vendor_ie(unsigned int oui, u8 oui_type,
const u8 *ies, int len);
/**
* DOC: Regulatory enforcement infrastructure
*

27
net/wireless/scan.c
View File

@ -228,6 +228,33 @@ const u8 *cfg80211_find_ie(u8 eid, const u8 *ies, int len)
}
EXPORT_SYMBOL(cfg80211_find_ie);
const u8 *cfg80211_find_vendor_ie(unsigned int oui, u8 oui_type,
const u8 *ies, int len)
{
struct ieee80211_vendor_ie *ie;
const u8 *pos = ies, *end = ies + len;
int ie_oui;
while (pos < end) {
pos = cfg80211_find_ie(WLAN_EID_VENDOR_SPECIFIC, pos,
end - pos);
if (!pos)
return NULL;
if (end - pos < sizeof(*ie))
return NULL;
ie = (struct ieee80211_vendor_ie *)pos;
ie_oui = ie->oui[0] << 16 | ie->oui[1] << 8 | ie->oui[2];
if (ie_oui == oui && ie->oui_type == oui_type)
return pos;
pos += 2 + ie->len;
}
return NULL;
}
EXPORT_SYMBOL(cfg80211_find_vendor_ie);
static int cmp_ies(u8 num, u8 *ies1, size_t len1, u8 *ies2, size_t len2)
{
const u8 *ie1 = cfg80211_find_ie(num, ies1, len1);