From 17b19396a675659e04eac6dbdbe57b2a9e462950 Mon Sep 17 00:00:00 2001 From: Jes Sorensen Date: Mon, 9 Jun 2014 15:16:25 +0200 Subject: [PATCH] staging: rtl8723au: rtw_check_bcn_info23a(): Don't make a local copy of beacon just to parse it In addition be consistent with return values and parsing them. Signed-off-by: Jes Sorensen Signed-off-by: Greg Kroah-Hartman --- drivers/staging/rtl8723au/core/rtw_mlme_ext.c | 2 +- .../staging/rtl8723au/core/rtw_wlan_util.c | 88 +++++++------------ 2 files changed, 32 insertions(+), 58 deletions(-) diff --git a/drivers/staging/rtl8723au/core/rtw_mlme_ext.c b/drivers/staging/rtl8723au/core/rtw_mlme_ext.c index ff0800e836e..693a1a48407 100644 --- a/drivers/staging/rtl8723au/core/rtw_mlme_ext.c +++ b/drivers/staging/rtl8723au/core/rtw_mlme_ext.c @@ -857,7 +857,7 @@ OnBeacon23a(struct rtw_adapter *padapter, struct recv_frame *precv_frame) psta = rtw_get_stainfo23a(pstapriv, mgmt->sa); if (psta) { ret = rtw_check_bcn_info23a(padapter, mgmt, pkt_len); - if (!ret) { + if (ret != _SUCCESS) { DBG_8723A_LEVEL(_drv_always_, "ap has changed, " "disconnect now\n"); receive_disconnect23a(padapter, pmlmeinfo->network.MacAddress, 65535); diff --git a/drivers/staging/rtl8723au/core/rtw_wlan_util.c b/drivers/staging/rtl8723au/core/rtw_wlan_util.c index a2c249fd88b..17b04c20541 100644 --- a/drivers/staging/rtl8723au/core/rtw_wlan_util.c +++ b/drivers/staging/rtl8723au/core/rtw_wlan_util.c @@ -885,28 +885,19 @@ int rtw_check_bcn_info23a(struct rtw_adapter *Adapter, { struct wlan_network *cur_network = &Adapter->mlmepriv.cur_network; struct ieee80211_ht_operation *pht_info; - struct wlan_bssid_ex *bssid; unsigned short val16; u8 encryp_protocol; int group_cipher = 0, pairwise_cipher = 0, is_8021x = 0, r; u32 bcn_channel; - int len, pie_len, ie_offset; - const u8 *p; - u8 *pie; + int pie_len, ie_offset, ssid_len, privacy; + const u8 *p, *ssid; if (is_client_associated_to_ap23a(Adapter) == false) - return true; + return _SUCCESS; if (unlikely(!ieee80211_is_beacon(mgmt->frame_control))) { printk(KERN_WARNING "%s: received a non beacon frame!\n", __func__); - return false; - } - - len = pkt_len - sizeof(struct ieee80211_hdr_3addr); - - if (len > MAX_IE_SZ) { - DBG_8723A("%s IE too long for survey event\n", __func__); return _FAIL; } @@ -914,36 +905,25 @@ int rtw_check_bcn_info23a(struct rtw_adapter *Adapter, DBG_8723A("%s: linked but recv other bssid bcn" MAC_FMT MAC_FMT "\n", __func__, MAC_ARG(mgmt->bssid), MAC_ARG(cur_network->network.MacAddress)); - return true; - } - - bssid = kzalloc(sizeof(struct wlan_bssid_ex), GFP_ATOMIC); - if (!bssid) return _FAIL; - - bssid->reserved = 1; - - bssid->Length = offsetof(struct wlan_bssid_ex, IEs) + len; - - /* below is to copy the information element */ - bssid->IELength = len; - memcpy(bssid->IEs, &mgmt->u, len); + } /* check bw and channel offset */ /* parsing HT_CAP_IE */ ie_offset = offsetof(struct ieee80211_mgmt, u.beacon.variable) - offsetof(struct ieee80211_mgmt, u); - pie = bssid->IEs + ie_offset; - pie_len = pkt_len - ie_offset; + pie_len = pkt_len - offsetof(struct ieee80211_mgmt, u.beacon.variable); /* Checking for channel */ - p = cfg80211_find_ie(WLAN_EID_DS_PARAMS, pie, pie_len); + p = cfg80211_find_ie(WLAN_EID_DS_PARAMS, mgmt->u.beacon.variable, + pie_len); if (p) bcn_channel = p[2]; else { /* In 5G, some ap do not have DSSET IE checking HT info for channel */ - p = cfg80211_find_ie(WLAN_EID_HT_OPERATION, pie, pie_len); + p = cfg80211_find_ie(WLAN_EID_HT_OPERATION, + mgmt->u.beacon.variable, pie_len); if (p && p[1] > 0) { pht_info = (struct ieee80211_ht_operation *)(p + 2); @@ -962,60 +942,55 @@ int rtw_check_bcn_info23a(struct rtw_adapter *Adapter, } /* checking SSID */ - p = cfg80211_find_ie(WLAN_EID_SSID, pie, pie_len); + p = cfg80211_find_ie(WLAN_EID_SSID, mgmt->u.beacon.variable, pie_len); if (p && p[1]) { - memcpy(bssid->Ssid.ssid, p + 2, p[1]); - bssid->Ssid.ssid_len = p[1]; + ssid = p + 2; + ssid_len = p[1]; } else { DBG_8723A("%s marc: cannot find SSID for survey event\n", __func__); - bssid->Ssid.ssid_len = 0; - bssid->Ssid.ssid[0] = '\0'; + ssid = NULL; + ssid_len = 0; } RT_TRACE(_module_rtl871x_mlme_c_, _drv_info_, ("%s bssid.Ssid.Ssid:%s bssid.Ssid.SsidLength:%d " "cur_network->network.Ssid.Ssid:%s len:%d\n", __func__, - bssid->Ssid.ssid, bssid->Ssid.ssid_len, - cur_network->network.Ssid.ssid, + ssid, ssid_len, cur_network->network.Ssid.ssid, cur_network->network.Ssid.ssid_len)); - if (memcmp(bssid->Ssid.ssid, cur_network->network.Ssid.ssid, 32) || - bssid->Ssid.ssid_len != cur_network->network.Ssid.ssid_len) { - if (bssid->Ssid.ssid[0] != '\0' && - bssid->Ssid.ssid_len != 0) { /* not hidden ssid */ - DBG_8723A("%s(), SSID is not match return FAIL\n", - __func__); - goto _mismatch; - } + if (ssid_len != cur_network->network.Ssid.ssid_len || ssid_len > 32 || + (ssid_len && + memcmp(ssid, cur_network->network.Ssid.ssid, ssid_len))) { + DBG_8723A("%s(), SSID is not match return FAIL\n", __func__); + goto _mismatch; } /* check encryption info */ - val16 = rtw_get_capability23a(bssid); + val16 = le16_to_cpu(mgmt->u.beacon.capab_info); if (val16 & WLAN_CAPABILITY_PRIVACY) - bssid->Privacy = 1; + privacy = 1; else - bssid->Privacy = 0; + privacy = 0; RT_TRACE(_module_rtl871x_mlme_c_, _drv_info_, ("%s(): cur_network->network.Privacy is %d, bssid.Privacy " - "is %d\n", __func__, cur_network->network.Privacy, - bssid->Privacy)); - if (cur_network->network.Privacy != bssid->Privacy) { + "is %d\n", __func__, cur_network->network.Privacy, privacy)); + if (cur_network->network.Privacy != privacy) { DBG_8723A("%s(), privacy is not match return FAIL\n", __func__); goto _mismatch; } - p = cfg80211_find_ie(WLAN_EID_RSN, pie, pie_len); + p = cfg80211_find_ie(WLAN_EID_RSN, mgmt->u.beacon.variable, pie_len); if (p && p[1]) { encryp_protocol = ENCRYP_PROTOCOL_WPA2; } else if (cfg80211_find_vendor_ie(WLAN_OUI_MICROSOFT, WLAN_OUI_TYPE_MICROSOFT_WPA, - pie, pie_len)) { + mgmt->u.beacon.variable, pie_len)) { encryp_protocol = ENCRYP_PROTOCOL_WPA; } else { - if (bssid->Privacy) + if (privacy) encryp_protocol = ENCRYP_PROTOCOL_WEP; else encryp_protocol = ENCRYP_PROTOCOL_OPENSYS; @@ -1030,7 +1005,7 @@ int rtw_check_bcn_info23a(struct rtw_adapter *Adapter, encryp_protocol == ENCRYP_PROTOCOL_WPA2) { p = cfg80211_find_vendor_ie(WLAN_OUI_MICROSOFT, WLAN_OUI_TYPE_MICROSOFT_WPA, - pie, pie_len); + mgmt->u.beacon.variable, pie_len); if (p && p[1] > 0) { r = rtw_parse_wpa_ie23a(p, p[1] + 2, &group_cipher, &pairwise_cipher, &is_8021x); @@ -1041,7 +1016,8 @@ int rtw_check_bcn_info23a(struct rtw_adapter *Adapter, "%d\n", __func__, pairwise_cipher, group_cipher, is_8021x)); } else { - p = cfg80211_find_ie(WLAN_EID_RSN, pie, pie_len); + p = cfg80211_find_ie(WLAN_EID_RSN, + mgmt->u.beacon.variable, pie_len); if (p && p[1] > 0) { r = rtw_parse_wpa2_ie23a(p, p[1] + 2, @@ -1080,11 +1056,9 @@ int rtw_check_bcn_info23a(struct rtw_adapter *Adapter, } } - kfree(bssid); return _SUCCESS; _mismatch: - kfree(bssid); return _FAIL; } -- 2.46.0