diff options
Diffstat (limited to 'net/mac80211/util.c')
| -rw-r--r-- | net/mac80211/util.c | 23 |
1 files changed, 21 insertions, 2 deletions
diff --git a/net/mac80211/util.c b/net/mac80211/util.c index b361e2acfce9..3dd490fa4b68 100644 --- a/net/mac80211/util.c +++ b/net/mac80211/util.c @@ -20,6 +20,7 @@ #include <linux/if_arp.h> #include <linux/wireless.h> #include <linux/bitmap.h> +#include <linux/crc32.h> #include <net/net_namespace.h> #include <net/cfg80211.h> #include <net/rtnetlink.h> @@ -537,8 +538,16 @@ EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic); void ieee802_11_parse_elems(u8 *start, size_t len, struct ieee802_11_elems *elems) { + ieee802_11_parse_elems_crc(start, len, elems, 0, 0); +} + +u32 ieee802_11_parse_elems_crc(u8 *start, size_t len, + struct ieee802_11_elems *elems, + u64 filter, u32 crc) +{ size_t left = len; u8 *pos = start; + bool calc_crc = filter != 0; memset(elems, 0, sizeof(*elems)); elems->ie_start = start; @@ -552,7 +561,10 @@ void ieee802_11_parse_elems(u8 *start, size_t len, left -= 2; if (elen > left) - return; + break; + + if (calc_crc && id < 64 && (filter & BIT(id))) + crc = crc32_be(crc, pos - 2, elen + 2); switch (id) { case WLAN_EID_SSID: @@ -587,15 +599,20 @@ void ieee802_11_parse_elems(u8 *start, size_t len, elems->challenge = pos; elems->challenge_len = elen; break; - case WLAN_EID_WPA: + case WLAN_EID_VENDOR_SPECIFIC: if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 && pos[2] == 0xf2) { /* Microsoft OUI (00:50:F2) */ + + if (calc_crc) + crc = crc32_be(crc, pos - 2, elen + 2); + if (pos[3] == 1) { /* OUI Type 1 - WPA IE */ elems->wpa = pos; elems->wpa_len = elen; } else if (elen >= 5 && pos[3] == 2) { + /* OUI Type 2 - WMM IE */ if (pos[4] == 0) { elems->wmm_info = pos; elems->wmm_info_len = elen; @@ -680,6 +697,8 @@ void ieee802_11_parse_elems(u8 *start, size_t len, left -= elen; pos += elen; } + + return crc; } void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata) |