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cfg80211: export cfg80211_find_ie

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This new function (previously a static function
called just "find_ie" can be used to find a
specific IE in a buffer of IEs.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Johannes Berg 2010-01-26 14:15:46 +01:00 committed by John W. Linville
parent 18c949070b
commit c21dbf9214
2 changed files with 36 additions and 18 deletions
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16
include/net/cfg80211.h
View File

@ -1658,6 +1658,22 @@ void ieee80211_amsdu_to_8023s(struct sk_buff *skb, struct sk_buff_head *list,
*/
unsigned int cfg80211_classify8021d(struct sk_buff *skb);
/**
* cfg80211_find_ie - find information element in data
*
* @eid: element ID
* @ies: data consisting of IEs
* @len: length of data
*
* This function will return %NULL if the 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_ie(u8 eid, const u8 *ies, int len);
/*
* Regulatory helper functions for wiphys
*/

38
net/wireless/scan.c
View File

@ -143,9 +143,9 @@ void cfg80211_bss_expire(struct cfg80211_registered_device *dev)
dev->bss_generation++;
}
static u8 *find_ie(u8 num, u8 *ies, int len)
const u8 *cfg80211_find_ie(u8 eid, const u8 *ies, int len)
{
while (len > 2 && ies[0] != num) {
while (len > 2 && ies[0] != eid) {
len -= ies[1] + 2;
ies += ies[1] + 2;
}
@ -155,11 +155,12 @@ static u8 *find_ie(u8 num, u8 *ies, int len)
return NULL;
return ies;
}
EXPORT_SYMBOL(cfg80211_find_ie);
static int cmp_ies(u8 num, u8 *ies1, size_t len1, u8 *ies2, size_t len2)
{
const u8 *ie1 = find_ie(num, ies1, len1);
const u8 *ie2 = find_ie(num, ies2, len2);
const u8 *ie1 = cfg80211_find_ie(num, ies1, len1);
const u8 *ie2 = cfg80211_find_ie(num, ies2, len2);
int r;
if (!ie1 && !ie2)
@ -185,9 +186,9 @@ static bool is_bss(struct cfg80211_bss *a,
if (!ssid)
return true;
ssidie = find_ie(WLAN_EID_SSID,
a->information_elements,
a->len_information_elements);
ssidie = cfg80211_find_ie(WLAN_EID_SSID,
a->information_elements,
a->len_information_elements);
if (!ssidie)
return false;
if (ssidie[1] != ssid_len)
@ -204,9 +205,9 @@ static bool is_mesh(struct cfg80211_bss *a,
if (!is_zero_ether_addr(a->bssid))
return false;
ie = find_ie(WLAN_EID_MESH_ID,
a->information_elements,
a->len_information_elements);
ie = cfg80211_find_ie(WLAN_EID_MESH_ID,
a->information_elements,
a->len_information_elements);
if (!ie)
return false;
if (ie[1] != meshidlen)
@ -214,9 +215,9 @@ static bool is_mesh(struct cfg80211_bss *a,
if (memcmp(ie + 2, meshid, meshidlen))
return false;
ie = find_ie(WLAN_EID_MESH_CONFIG,
a->information_elements,
a->len_information_elements);
ie = cfg80211_find_ie(WLAN_EID_MESH_CONFIG,
a->information_elements,
a->len_information_elements);
if (!ie)
return false;
if (ie[1] != sizeof(struct ieee80211_meshconf_ie))
@ -395,11 +396,12 @@ cfg80211_bss_update(struct cfg80211_registered_device *dev,
if (is_zero_ether_addr(res->pub.bssid)) {
/* must be mesh, verify */
meshid = find_ie(WLAN_EID_MESH_ID, res->pub.information_elements,
res->pub.len_information_elements);
meshcfg = find_ie(WLAN_EID_MESH_CONFIG,
res->pub.information_elements,
res->pub.len_information_elements);
meshid = cfg80211_find_ie(WLAN_EID_MESH_ID,
res->pub.information_elements,
res->pub.len_information_elements);
meshcfg = cfg80211_find_ie(WLAN_EID_MESH_CONFIG,
res->pub.information_elements,
res->pub.len_information_elements);
if (!meshid || !meshcfg ||
meshcfg[1] != sizeof(struct ieee80211_meshconf_ie)) {
/* bogus mesh */