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4953 lines
137 KiB
4953 lines
137 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Copyright 2002-2005, Instant802 Networks, Inc. |
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* Copyright 2005-2006, Devicescape Software, Inc. |
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* Copyright 2006-2007 Jiri Benc <[email protected]> |
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* Copyright 2007-2010 Johannes Berg <[email protected]> |
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* Copyright 2013-2014 Intel Mobile Communications GmbH |
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* Copyright(c) 2015 - 2017 Intel Deutschland GmbH |
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* Copyright (C) 2018-2021 Intel Corporation |
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*/ |
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|
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#include <linux/jiffies.h> |
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#include <linux/slab.h> |
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#include <linux/kernel.h> |
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#include <linux/skbuff.h> |
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#include <linux/netdevice.h> |
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#include <linux/etherdevice.h> |
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#include <linux/rcupdate.h> |
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#include <linux/export.h> |
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#include <linux/bitops.h> |
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#include <net/mac80211.h> |
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#include <net/ieee80211_radiotap.h> |
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#include <asm/unaligned.h> |
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|
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#include "ieee80211_i.h" |
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#include "driver-ops.h" |
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#include "led.h" |
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#include "mesh.h" |
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#include "wep.h" |
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#include "wpa.h" |
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#include "tkip.h" |
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#include "wme.h" |
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#include "rate.h" |
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|
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/* |
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* monitor mode reception |
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* |
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* This function cleans up the SKB, i.e. it removes all the stuff |
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* only useful for monitoring. |
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*/ |
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static struct sk_buff *ieee80211_clean_skb(struct sk_buff *skb, |
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unsigned int present_fcs_len, |
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unsigned int rtap_space) |
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{ |
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struct ieee80211_hdr *hdr; |
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unsigned int hdrlen; |
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__le16 fc; |
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|
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if (present_fcs_len) |
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__pskb_trim(skb, skb->len - present_fcs_len); |
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__pskb_pull(skb, rtap_space); |
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|
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hdr = (void *)skb->data; |
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fc = hdr->frame_control; |
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|
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/* |
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* Remove the HT-Control field (if present) on management |
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* frames after we've sent the frame to monitoring. We |
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* (currently) don't need it, and don't properly parse |
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* frames with it present, due to the assumption of a |
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* fixed management header length. |
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*/ |
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if (likely(!ieee80211_is_mgmt(fc) || !ieee80211_has_order(fc))) |
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return skb; |
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|
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hdrlen = ieee80211_hdrlen(fc); |
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hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_ORDER); |
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|
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if (!pskb_may_pull(skb, hdrlen)) { |
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dev_kfree_skb(skb); |
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return NULL; |
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} |
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|
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memmove(skb->data + IEEE80211_HT_CTL_LEN, skb->data, |
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hdrlen - IEEE80211_HT_CTL_LEN); |
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__pskb_pull(skb, IEEE80211_HT_CTL_LEN); |
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|
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return skb; |
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} |
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|
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static inline bool should_drop_frame(struct sk_buff *skb, int present_fcs_len, |
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unsigned int rtap_space) |
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{ |
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struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
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struct ieee80211_hdr *hdr; |
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|
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hdr = (void *)(skb->data + rtap_space); |
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|
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if (status->flag & (RX_FLAG_FAILED_FCS_CRC | |
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RX_FLAG_FAILED_PLCP_CRC | |
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RX_FLAG_ONLY_MONITOR | |
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RX_FLAG_NO_PSDU)) |
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return true; |
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|
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if (unlikely(skb->len < 16 + present_fcs_len + rtap_space)) |
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return true; |
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|
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if (ieee80211_is_ctl(hdr->frame_control) && |
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!ieee80211_is_pspoll(hdr->frame_control) && |
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!ieee80211_is_back_req(hdr->frame_control)) |
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return true; |
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|
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return false; |
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} |
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|
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static int |
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ieee80211_rx_radiotap_hdrlen(struct ieee80211_local *local, |
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struct ieee80211_rx_status *status, |
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struct sk_buff *skb) |
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{ |
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int len; |
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|
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/* always present fields */ |
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len = sizeof(struct ieee80211_radiotap_header) + 8; |
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|
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/* allocate extra bitmaps */ |
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if (status->chains) |
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len += 4 * hweight8(status->chains); |
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/* vendor presence bitmap */ |
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if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) |
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len += 4; |
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|
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if (ieee80211_have_rx_timestamp(status)) { |
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len = ALIGN(len, 8); |
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len += 8; |
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} |
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if (ieee80211_hw_check(&local->hw, SIGNAL_DBM)) |
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len += 1; |
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|
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/* antenna field, if we don't have per-chain info */ |
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if (!status->chains) |
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len += 1; |
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|
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/* padding for RX_FLAGS if necessary */ |
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len = ALIGN(len, 2); |
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|
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if (status->encoding == RX_ENC_HT) /* HT info */ |
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len += 3; |
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|
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if (status->flag & RX_FLAG_AMPDU_DETAILS) { |
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len = ALIGN(len, 4); |
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len += 8; |
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} |
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|
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if (status->encoding == RX_ENC_VHT) { |
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len = ALIGN(len, 2); |
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len += 12; |
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} |
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|
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if (local->hw.radiotap_timestamp.units_pos >= 0) { |
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len = ALIGN(len, 8); |
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len += 12; |
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} |
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|
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if (status->encoding == RX_ENC_HE && |
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status->flag & RX_FLAG_RADIOTAP_HE) { |
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len = ALIGN(len, 2); |
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len += 12; |
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BUILD_BUG_ON(sizeof(struct ieee80211_radiotap_he) != 12); |
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} |
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|
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if (status->encoding == RX_ENC_HE && |
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status->flag & RX_FLAG_RADIOTAP_HE_MU) { |
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len = ALIGN(len, 2); |
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len += 12; |
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BUILD_BUG_ON(sizeof(struct ieee80211_radiotap_he_mu) != 12); |
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} |
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if (status->flag & RX_FLAG_NO_PSDU) |
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len += 1; |
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|
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if (status->flag & RX_FLAG_RADIOTAP_LSIG) { |
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len = ALIGN(len, 2); |
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len += 4; |
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BUILD_BUG_ON(sizeof(struct ieee80211_radiotap_lsig) != 4); |
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} |
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|
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if (status->chains) { |
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/* antenna and antenna signal fields */ |
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len += 2 * hweight8(status->chains); |
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} |
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|
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if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) { |
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struct ieee80211_vendor_radiotap *rtap; |
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int vendor_data_offset = 0; |
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|
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/* |
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* The position to look at depends on the existence (or non- |
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* existence) of other elements, so take that into account... |
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*/ |
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if (status->flag & RX_FLAG_RADIOTAP_HE) |
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vendor_data_offset += |
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sizeof(struct ieee80211_radiotap_he); |
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if (status->flag & RX_FLAG_RADIOTAP_HE_MU) |
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vendor_data_offset += |
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sizeof(struct ieee80211_radiotap_he_mu); |
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if (status->flag & RX_FLAG_RADIOTAP_LSIG) |
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vendor_data_offset += |
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sizeof(struct ieee80211_radiotap_lsig); |
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|
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rtap = (void *)&skb->data[vendor_data_offset]; |
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|
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/* alignment for fixed 6-byte vendor data header */ |
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len = ALIGN(len, 2); |
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/* vendor data header */ |
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len += 6; |
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if (WARN_ON(rtap->align == 0)) |
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rtap->align = 1; |
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len = ALIGN(len, rtap->align); |
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len += rtap->len + rtap->pad; |
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} |
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return len; |
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} |
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|
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static void ieee80211_handle_mu_mimo_mon(struct ieee80211_sub_if_data *sdata, |
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struct sk_buff *skb, |
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int rtap_space) |
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{ |
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struct { |
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struct ieee80211_hdr_3addr hdr; |
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u8 category; |
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u8 action_code; |
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} __packed __aligned(2) action; |
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|
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if (!sdata) |
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return; |
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BUILD_BUG_ON(sizeof(action) != IEEE80211_MIN_ACTION_SIZE + 1); |
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if (skb->len < rtap_space + sizeof(action) + |
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VHT_MUMIMO_GROUPS_DATA_LEN) |
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return; |
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if (!is_valid_ether_addr(sdata->u.mntr.mu_follow_addr)) |
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return; |
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skb_copy_bits(skb, rtap_space, &action, sizeof(action)); |
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|
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if (!ieee80211_is_action(action.hdr.frame_control)) |
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return; |
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if (action.category != WLAN_CATEGORY_VHT) |
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return; |
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if (action.action_code != WLAN_VHT_ACTION_GROUPID_MGMT) |
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return; |
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|
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if (!ether_addr_equal(action.hdr.addr1, sdata->u.mntr.mu_follow_addr)) |
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return; |
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skb = skb_copy(skb, GFP_ATOMIC); |
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if (!skb) |
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return; |
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skb_queue_tail(&sdata->skb_queue, skb); |
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ieee80211_queue_work(&sdata->local->hw, &sdata->work); |
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} |
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/* |
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* ieee80211_add_rx_radiotap_header - add radiotap header |
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* |
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* add a radiotap header containing all the fields which the hardware provided. |
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*/ |
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static void |
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ieee80211_add_rx_radiotap_header(struct ieee80211_local *local, |
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struct sk_buff *skb, |
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struct ieee80211_rate *rate, |
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int rtap_len, bool has_fcs) |
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{ |
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struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
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struct ieee80211_radiotap_header *rthdr; |
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unsigned char *pos; |
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__le32 *it_present; |
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u32 it_present_val; |
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u16 rx_flags = 0; |
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u16 channel_flags = 0; |
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int mpdulen, chain; |
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unsigned long chains = status->chains; |
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struct ieee80211_vendor_radiotap rtap = {}; |
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struct ieee80211_radiotap_he he = {}; |
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struct ieee80211_radiotap_he_mu he_mu = {}; |
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struct ieee80211_radiotap_lsig lsig = {}; |
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|
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if (status->flag & RX_FLAG_RADIOTAP_HE) { |
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he = *(struct ieee80211_radiotap_he *)skb->data; |
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skb_pull(skb, sizeof(he)); |
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WARN_ON_ONCE(status->encoding != RX_ENC_HE); |
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} |
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|
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if (status->flag & RX_FLAG_RADIOTAP_HE_MU) { |
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he_mu = *(struct ieee80211_radiotap_he_mu *)skb->data; |
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skb_pull(skb, sizeof(he_mu)); |
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} |
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if (status->flag & RX_FLAG_RADIOTAP_LSIG) { |
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lsig = *(struct ieee80211_radiotap_lsig *)skb->data; |
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skb_pull(skb, sizeof(lsig)); |
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} |
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if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) { |
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rtap = *(struct ieee80211_vendor_radiotap *)skb->data; |
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/* rtap.len and rtap.pad are undone immediately */ |
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skb_pull(skb, sizeof(rtap) + rtap.len + rtap.pad); |
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} |
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mpdulen = skb->len; |
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if (!(has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS))) |
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mpdulen += FCS_LEN; |
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rthdr = skb_push(skb, rtap_len); |
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memset(rthdr, 0, rtap_len - rtap.len - rtap.pad); |
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it_present = &rthdr->it_present; |
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|
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/* radiotap header, set always present flags */ |
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rthdr->it_len = cpu_to_le16(rtap_len); |
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it_present_val = BIT(IEEE80211_RADIOTAP_FLAGS) | |
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BIT(IEEE80211_RADIOTAP_CHANNEL) | |
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BIT(IEEE80211_RADIOTAP_RX_FLAGS); |
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if (!status->chains) |
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it_present_val |= BIT(IEEE80211_RADIOTAP_ANTENNA); |
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for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) { |
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it_present_val |= |
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BIT(IEEE80211_RADIOTAP_EXT) | |
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BIT(IEEE80211_RADIOTAP_RADIOTAP_NAMESPACE); |
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put_unaligned_le32(it_present_val, it_present); |
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it_present++; |
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it_present_val = BIT(IEEE80211_RADIOTAP_ANTENNA) | |
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BIT(IEEE80211_RADIOTAP_DBM_ANTSIGNAL); |
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} |
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if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) { |
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it_present_val |= BIT(IEEE80211_RADIOTAP_VENDOR_NAMESPACE) | |
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BIT(IEEE80211_RADIOTAP_EXT); |
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put_unaligned_le32(it_present_val, it_present); |
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it_present++; |
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it_present_val = rtap.present; |
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} |
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put_unaligned_le32(it_present_val, it_present); |
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pos = (void *)(it_present + 1); |
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|
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/* the order of the following fields is important */ |
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|
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/* IEEE80211_RADIOTAP_TSFT */ |
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if (ieee80211_have_rx_timestamp(status)) { |
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/* padding */ |
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while ((pos - (u8 *)rthdr) & 7) |
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*pos++ = 0; |
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put_unaligned_le64( |
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ieee80211_calculate_rx_timestamp(local, status, |
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mpdulen, 0), |
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pos); |
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rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT); |
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pos += 8; |
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} |
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|
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/* IEEE80211_RADIOTAP_FLAGS */ |
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if (has_fcs && ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)) |
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*pos |= IEEE80211_RADIOTAP_F_FCS; |
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if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC)) |
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*pos |= IEEE80211_RADIOTAP_F_BADFCS; |
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if (status->enc_flags & RX_ENC_FLAG_SHORTPRE) |
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*pos |= IEEE80211_RADIOTAP_F_SHORTPRE; |
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pos++; |
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|
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/* IEEE80211_RADIOTAP_RATE */ |
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if (!rate || status->encoding != RX_ENC_LEGACY) { |
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/* |
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* Without rate information don't add it. If we have, |
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* MCS information is a separate field in radiotap, |
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* added below. The byte here is needed as padding |
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* for the channel though, so initialise it to 0. |
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*/ |
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*pos = 0; |
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} else { |
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int shift = 0; |
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rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE); |
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if (status->bw == RATE_INFO_BW_10) |
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shift = 1; |
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else if (status->bw == RATE_INFO_BW_5) |
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shift = 2; |
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*pos = DIV_ROUND_UP(rate->bitrate, 5 * (1 << shift)); |
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} |
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pos++; |
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|
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/* IEEE80211_RADIOTAP_CHANNEL */ |
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/* TODO: frequency offset in KHz */ |
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put_unaligned_le16(status->freq, pos); |
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pos += 2; |
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if (status->bw == RATE_INFO_BW_10) |
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channel_flags |= IEEE80211_CHAN_HALF; |
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else if (status->bw == RATE_INFO_BW_5) |
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channel_flags |= IEEE80211_CHAN_QUARTER; |
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|
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if (status->band == NL80211_BAND_5GHZ || |
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status->band == NL80211_BAND_6GHZ) |
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channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ; |
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else if (status->encoding != RX_ENC_LEGACY) |
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channel_flags |= IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ; |
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else if (rate && rate->flags & IEEE80211_RATE_ERP_G) |
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channel_flags |= IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ; |
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else if (rate) |
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channel_flags |= IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ; |
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else |
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channel_flags |= IEEE80211_CHAN_2GHZ; |
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put_unaligned_le16(channel_flags, pos); |
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pos += 2; |
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|
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/* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */ |
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if (ieee80211_hw_check(&local->hw, SIGNAL_DBM) && |
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!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) { |
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*pos = status->signal; |
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rthdr->it_present |= |
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cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL); |
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pos++; |
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} |
|
|
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/* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */ |
|
|
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if (!status->chains) { |
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/* IEEE80211_RADIOTAP_ANTENNA */ |
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*pos = status->antenna; |
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pos++; |
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} |
|
|
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/* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */ |
|
|
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/* IEEE80211_RADIOTAP_RX_FLAGS */ |
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/* ensure 2 byte alignment for the 2 byte field as required */ |
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if ((pos - (u8 *)rthdr) & 1) |
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*pos++ = 0; |
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if (status->flag & RX_FLAG_FAILED_PLCP_CRC) |
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rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP; |
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put_unaligned_le16(rx_flags, pos); |
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pos += 2; |
|
|
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if (status->encoding == RX_ENC_HT) { |
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unsigned int stbc; |
|
|
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rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS); |
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*pos++ = local->hw.radiotap_mcs_details; |
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*pos = 0; |
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if (status->enc_flags & RX_ENC_FLAG_SHORT_GI) |
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*pos |= IEEE80211_RADIOTAP_MCS_SGI; |
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if (status->bw == RATE_INFO_BW_40) |
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*pos |= IEEE80211_RADIOTAP_MCS_BW_40; |
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if (status->enc_flags & RX_ENC_FLAG_HT_GF) |
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*pos |= IEEE80211_RADIOTAP_MCS_FMT_GF; |
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if (status->enc_flags & RX_ENC_FLAG_LDPC) |
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*pos |= IEEE80211_RADIOTAP_MCS_FEC_LDPC; |
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stbc = (status->enc_flags & RX_ENC_FLAG_STBC_MASK) >> RX_ENC_FLAG_STBC_SHIFT; |
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*pos |= stbc << IEEE80211_RADIOTAP_MCS_STBC_SHIFT; |
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pos++; |
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*pos++ = status->rate_idx; |
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} |
|
|
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if (status->flag & RX_FLAG_AMPDU_DETAILS) { |
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u16 flags = 0; |
|
|
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/* ensure 4 byte alignment */ |
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while ((pos - (u8 *)rthdr) & 3) |
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pos++; |
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rthdr->it_present |= |
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cpu_to_le32(1 << IEEE80211_RADIOTAP_AMPDU_STATUS); |
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put_unaligned_le32(status->ampdu_reference, pos); |
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pos += 4; |
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if (status->flag & RX_FLAG_AMPDU_LAST_KNOWN) |
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flags |= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN; |
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if (status->flag & RX_FLAG_AMPDU_IS_LAST) |
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flags |= IEEE80211_RADIOTAP_AMPDU_IS_LAST; |
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if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_ERROR) |
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flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR; |
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if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN) |
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flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN; |
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if (status->flag & RX_FLAG_AMPDU_EOF_BIT_KNOWN) |
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flags |= IEEE80211_RADIOTAP_AMPDU_EOF_KNOWN; |
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if (status->flag & RX_FLAG_AMPDU_EOF_BIT) |
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flags |= IEEE80211_RADIOTAP_AMPDU_EOF; |
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put_unaligned_le16(flags, pos); |
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pos += 2; |
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if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN) |
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*pos++ = status->ampdu_delimiter_crc; |
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else |
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*pos++ = 0; |
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*pos++ = 0; |
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} |
|
|
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if (status->encoding == RX_ENC_VHT) { |
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u16 known = local->hw.radiotap_vht_details; |
|
|
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rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT); |
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put_unaligned_le16(known, pos); |
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pos += 2; |
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/* flags */ |
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if (status->enc_flags & RX_ENC_FLAG_SHORT_GI) |
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*pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI; |
|
/* in VHT, STBC is binary */ |
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if (status->enc_flags & RX_ENC_FLAG_STBC_MASK) |
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*pos |= IEEE80211_RADIOTAP_VHT_FLAG_STBC; |
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if (status->enc_flags & RX_ENC_FLAG_BF) |
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*pos |= IEEE80211_RADIOTAP_VHT_FLAG_BEAMFORMED; |
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pos++; |
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/* bandwidth */ |
|
switch (status->bw) { |
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case RATE_INFO_BW_80: |
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*pos++ = 4; |
|
break; |
|
case RATE_INFO_BW_160: |
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*pos++ = 11; |
|
break; |
|
case RATE_INFO_BW_40: |
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*pos++ = 1; |
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break; |
|
default: |
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*pos++ = 0; |
|
} |
|
/* MCS/NSS */ |
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*pos = (status->rate_idx << 4) | status->nss; |
|
pos += 4; |
|
/* coding field */ |
|
if (status->enc_flags & RX_ENC_FLAG_LDPC) |
|
*pos |= IEEE80211_RADIOTAP_CODING_LDPC_USER0; |
|
pos++; |
|
/* group ID */ |
|
pos++; |
|
/* partial_aid */ |
|
pos += 2; |
|
} |
|
|
|
if (local->hw.radiotap_timestamp.units_pos >= 0) { |
|
u16 accuracy = 0; |
|
u8 flags = IEEE80211_RADIOTAP_TIMESTAMP_FLAG_32BIT; |
|
|
|
rthdr->it_present |= |
|
cpu_to_le32(1 << IEEE80211_RADIOTAP_TIMESTAMP); |
|
|
|
/* ensure 8 byte alignment */ |
|
while ((pos - (u8 *)rthdr) & 7) |
|
pos++; |
|
|
|
put_unaligned_le64(status->device_timestamp, pos); |
|
pos += sizeof(u64); |
|
|
|
if (local->hw.radiotap_timestamp.accuracy >= 0) { |
|
accuracy = local->hw.radiotap_timestamp.accuracy; |
|
flags |= IEEE80211_RADIOTAP_TIMESTAMP_FLAG_ACCURACY; |
|
} |
|
put_unaligned_le16(accuracy, pos); |
|
pos += sizeof(u16); |
|
|
|
*pos++ = local->hw.radiotap_timestamp.units_pos; |
|
*pos++ = flags; |
|
} |
|
|
|
if (status->encoding == RX_ENC_HE && |
|
status->flag & RX_FLAG_RADIOTAP_HE) { |
|
#define HE_PREP(f, val) le16_encode_bits(val, IEEE80211_RADIOTAP_HE_##f) |
|
|
|
if (status->enc_flags & RX_ENC_FLAG_STBC_MASK) { |
|
he.data6 |= HE_PREP(DATA6_NSTS, |
|
FIELD_GET(RX_ENC_FLAG_STBC_MASK, |
|
status->enc_flags)); |
|
he.data3 |= HE_PREP(DATA3_STBC, 1); |
|
} else { |
|
he.data6 |= HE_PREP(DATA6_NSTS, status->nss); |
|
} |
|
|
|
#define CHECK_GI(s) \ |
|
BUILD_BUG_ON(IEEE80211_RADIOTAP_HE_DATA5_GI_##s != \ |
|
(int)NL80211_RATE_INFO_HE_GI_##s) |
|
|
|
CHECK_GI(0_8); |
|
CHECK_GI(1_6); |
|
CHECK_GI(3_2); |
|
|
|
he.data3 |= HE_PREP(DATA3_DATA_MCS, status->rate_idx); |
|
he.data3 |= HE_PREP(DATA3_DATA_DCM, status->he_dcm); |
|
he.data3 |= HE_PREP(DATA3_CODING, |
|
!!(status->enc_flags & RX_ENC_FLAG_LDPC)); |
|
|
|
he.data5 |= HE_PREP(DATA5_GI, status->he_gi); |
|
|
|
switch (status->bw) { |
|
case RATE_INFO_BW_20: |
|
he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC, |
|
IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_20MHZ); |
|
break; |
|
case RATE_INFO_BW_40: |
|
he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC, |
|
IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_40MHZ); |
|
break; |
|
case RATE_INFO_BW_80: |
|
he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC, |
|
IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_80MHZ); |
|
break; |
|
case RATE_INFO_BW_160: |
|
he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC, |
|
IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_160MHZ); |
|
break; |
|
case RATE_INFO_BW_HE_RU: |
|
#define CHECK_RU_ALLOC(s) \ |
|
BUILD_BUG_ON(IEEE80211_RADIOTAP_HE_DATA5_DATA_BW_RU_ALLOC_##s##T != \ |
|
NL80211_RATE_INFO_HE_RU_ALLOC_##s + 4) |
|
|
|
CHECK_RU_ALLOC(26); |
|
CHECK_RU_ALLOC(52); |
|
CHECK_RU_ALLOC(106); |
|
CHECK_RU_ALLOC(242); |
|
CHECK_RU_ALLOC(484); |
|
CHECK_RU_ALLOC(996); |
|
CHECK_RU_ALLOC(2x996); |
|
|
|
he.data5 |= HE_PREP(DATA5_DATA_BW_RU_ALLOC, |
|
status->he_ru + 4); |
|
break; |
|
default: |
|
WARN_ONCE(1, "Invalid SU BW %d\n", status->bw); |
|
} |
|
|
|
/* ensure 2 byte alignment */ |
|
while ((pos - (u8 *)rthdr) & 1) |
|
pos++; |
|
rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_HE); |
|
memcpy(pos, &he, sizeof(he)); |
|
pos += sizeof(he); |
|
} |
|
|
|
if (status->encoding == RX_ENC_HE && |
|
status->flag & RX_FLAG_RADIOTAP_HE_MU) { |
|
/* ensure 2 byte alignment */ |
|
while ((pos - (u8 *)rthdr) & 1) |
|
pos++; |
|
rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_HE_MU); |
|
memcpy(pos, &he_mu, sizeof(he_mu)); |
|
pos += sizeof(he_mu); |
|
} |
|
|
|
if (status->flag & RX_FLAG_NO_PSDU) { |
|
rthdr->it_present |= |
|
cpu_to_le32(1 << IEEE80211_RADIOTAP_ZERO_LEN_PSDU); |
|
*pos++ = status->zero_length_psdu_type; |
|
} |
|
|
|
if (status->flag & RX_FLAG_RADIOTAP_LSIG) { |
|
/* ensure 2 byte alignment */ |
|
while ((pos - (u8 *)rthdr) & 1) |
|
pos++; |
|
rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_LSIG); |
|
memcpy(pos, &lsig, sizeof(lsig)); |
|
pos += sizeof(lsig); |
|
} |
|
|
|
for_each_set_bit(chain, &chains, IEEE80211_MAX_CHAINS) { |
|
*pos++ = status->chain_signal[chain]; |
|
*pos++ = chain; |
|
} |
|
|
|
if (status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA) { |
|
/* ensure 2 byte alignment for the vendor field as required */ |
|
if ((pos - (u8 *)rthdr) & 1) |
|
*pos++ = 0; |
|
*pos++ = rtap.oui[0]; |
|
*pos++ = rtap.oui[1]; |
|
*pos++ = rtap.oui[2]; |
|
*pos++ = rtap.subns; |
|
put_unaligned_le16(rtap.len, pos); |
|
pos += 2; |
|
/* align the actual payload as requested */ |
|
while ((pos - (u8 *)rthdr) & (rtap.align - 1)) |
|
*pos++ = 0; |
|
/* data (and possible padding) already follows */ |
|
} |
|
} |
|
|
|
static struct sk_buff * |
|
ieee80211_make_monitor_skb(struct ieee80211_local *local, |
|
struct sk_buff **origskb, |
|
struct ieee80211_rate *rate, |
|
int rtap_space, bool use_origskb) |
|
{ |
|
struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(*origskb); |
|
int rt_hdrlen, needed_headroom; |
|
struct sk_buff *skb; |
|
|
|
/* room for the radiotap header based on driver features */ |
|
rt_hdrlen = ieee80211_rx_radiotap_hdrlen(local, status, *origskb); |
|
needed_headroom = rt_hdrlen - rtap_space; |
|
|
|
if (use_origskb) { |
|
/* only need to expand headroom if necessary */ |
|
skb = *origskb; |
|
*origskb = NULL; |
|
|
|
/* |
|
* This shouldn't trigger often because most devices have an |
|
* RX header they pull before we get here, and that should |
|
* be big enough for our radiotap information. We should |
|
* probably export the length to drivers so that we can have |
|
* them allocate enough headroom to start with. |
|
*/ |
|
if (skb_headroom(skb) < needed_headroom && |
|
pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) { |
|
dev_kfree_skb(skb); |
|
return NULL; |
|
} |
|
} else { |
|
/* |
|
* Need to make a copy and possibly remove radiotap header |
|
* and FCS from the original. |
|
*/ |
|
skb = skb_copy_expand(*origskb, needed_headroom, 0, GFP_ATOMIC); |
|
|
|
if (!skb) |
|
return NULL; |
|
} |
|
|
|
/* prepend radiotap information */ |
|
ieee80211_add_rx_radiotap_header(local, skb, rate, rt_hdrlen, true); |
|
|
|
skb_reset_mac_header(skb); |
|
skb->ip_summed = CHECKSUM_UNNECESSARY; |
|
skb->pkt_type = PACKET_OTHERHOST; |
|
skb->protocol = htons(ETH_P_802_2); |
|
|
|
return skb; |
|
} |
|
|
|
/* |
|
* This function copies a received frame to all monitor interfaces and |
|
* returns a cleaned-up SKB that no longer includes the FCS nor the |
|
* radiotap header the driver might have added. |
|
*/ |
|
static struct sk_buff * |
|
ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb, |
|
struct ieee80211_rate *rate) |
|
{ |
|
struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb); |
|
struct ieee80211_sub_if_data *sdata; |
|
struct sk_buff *monskb = NULL; |
|
int present_fcs_len = 0; |
|
unsigned int rtap_space = 0; |
|
struct ieee80211_sub_if_data *monitor_sdata = |
|
rcu_dereference(local->monitor_sdata); |
|
bool only_monitor = false; |
|
unsigned int min_head_len; |
|
|
|
if (status->flag & RX_FLAG_RADIOTAP_HE) |
|
rtap_space += sizeof(struct ieee80211_radiotap_he); |
|
|
|
if (status->flag & RX_FLAG_RADIOTAP_HE_MU) |
|
rtap_space += sizeof(struct ieee80211_radiotap_he_mu); |
|
|
|
if (status->flag & RX_FLAG_RADIOTAP_LSIG) |
|
rtap_space += sizeof(struct ieee80211_radiotap_lsig); |
|
|
|
if (unlikely(status->flag & RX_FLAG_RADIOTAP_VENDOR_DATA)) { |
|
struct ieee80211_vendor_radiotap *rtap = |
|
(void *)(origskb->data + rtap_space); |
|
|
|
rtap_space += sizeof(*rtap) + rtap->len + rtap->pad; |
|
} |
|
|
|
min_head_len = rtap_space; |
|
|
|
/* |
|
* First, we may need to make a copy of the skb because |
|
* (1) we need to modify it for radiotap (if not present), and |
|
* (2) the other RX handlers will modify the skb we got. |
|
* |
|
* We don't need to, of course, if we aren't going to return |
|
* the SKB because it has a bad FCS/PLCP checksum. |
|
*/ |
|
|
|
if (!(status->flag & RX_FLAG_NO_PSDU)) { |
|
if (ieee80211_hw_check(&local->hw, RX_INCLUDES_FCS)) { |
|
if (unlikely(origskb->len <= FCS_LEN + rtap_space)) { |
|
/* driver bug */ |
|
WARN_ON(1); |
|
dev_kfree_skb(origskb); |
|
return NULL; |
|
} |
|
present_fcs_len = FCS_LEN; |
|
} |
|
|
|
/* also consider the hdr->frame_control */ |
|
min_head_len += 2; |
|
} |
|
|
|
/* ensure that the expected data elements are in skb head */ |
|
if (!pskb_may_pull(origskb, min_head_len)) { |
|
dev_kfree_skb(origskb); |
|
return NULL; |
|
} |
|
|
|
only_monitor = should_drop_frame(origskb, present_fcs_len, rtap_space); |
|
|
|
if (!local->monitors || (status->flag & RX_FLAG_SKIP_MONITOR)) { |
|
if (only_monitor) { |
|
dev_kfree_skb(origskb); |
|
return NULL; |
|
} |
|
|
|
return ieee80211_clean_skb(origskb, present_fcs_len, |
|
rtap_space); |
|
} |
|
|
|
ieee80211_handle_mu_mimo_mon(monitor_sdata, origskb, rtap_space); |
|
|
|
list_for_each_entry_rcu(sdata, &local->mon_list, u.mntr.list) { |
|
bool last_monitor = list_is_last(&sdata->u.mntr.list, |
|
&local->mon_list); |
|
|
|
if (!monskb) |
|
monskb = ieee80211_make_monitor_skb(local, &origskb, |
|
rate, rtap_space, |
|
only_monitor && |
|
last_monitor); |
|
|
|
if (monskb) { |
|
struct sk_buff *skb; |
|
|
|
if (last_monitor) { |
|
skb = monskb; |
|
monskb = NULL; |
|
} else { |
|
skb = skb_clone(monskb, GFP_ATOMIC); |
|
} |
|
|
|
if (skb) { |
|
skb->dev = sdata->dev; |
|
dev_sw_netstats_rx_add(skb->dev, skb->len); |
|
netif_receive_skb(skb); |
|
} |
|
} |
|
|
|
if (last_monitor) |
|
break; |
|
} |
|
|
|
/* this happens if last_monitor was erroneously false */ |
|
dev_kfree_skb(monskb); |
|
|
|
/* ditto */ |
|
if (!origskb) |
|
return NULL; |
|
|
|
return ieee80211_clean_skb(origskb, present_fcs_len, rtap_space); |
|
} |
|
|
|
static void ieee80211_parse_qos(struct ieee80211_rx_data *rx) |
|
{ |
|
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
|
struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); |
|
int tid, seqno_idx, security_idx; |
|
|
|
/* does the frame have a qos control field? */ |
|
if (ieee80211_is_data_qos(hdr->frame_control)) { |
|
u8 *qc = ieee80211_get_qos_ctl(hdr); |
|
/* frame has qos control */ |
|
tid = *qc & IEEE80211_QOS_CTL_TID_MASK; |
|
if (*qc & IEEE80211_QOS_CTL_A_MSDU_PRESENT) |
|
status->rx_flags |= IEEE80211_RX_AMSDU; |
|
|
|
seqno_idx = tid; |
|
security_idx = tid; |
|
} else { |
|
/* |
|
* IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"): |
|
* |
|
* Sequence numbers for management frames, QoS data |
|
* frames with a broadcast/multicast address in the |
|
* Address 1 field, and all non-QoS data frames sent |
|
* by QoS STAs are assigned using an additional single |
|
* modulo-4096 counter, [...] |
|
* |
|
* We also use that counter for non-QoS STAs. |
|
*/ |
|
seqno_idx = IEEE80211_NUM_TIDS; |
|
security_idx = 0; |
|
if (ieee80211_is_mgmt(hdr->frame_control)) |
|
security_idx = IEEE80211_NUM_TIDS; |
|
tid = 0; |
|
} |
|
|
|
rx->seqno_idx = seqno_idx; |
|
rx->security_idx = security_idx; |
|
/* Set skb->priority to 1d tag if highest order bit of TID is not set. |
|
* For now, set skb->priority to 0 for other cases. */ |
|
rx->skb->priority = (tid > 7) ? 0 : tid; |
|
} |
|
|
|
/** |
|
* DOC: Packet alignment |
|
* |
|
* Drivers always need to pass packets that are aligned to two-byte boundaries |
|
* to the stack. |
|
* |
|
* Additionally, should, if possible, align the payload data in a way that |
|
* guarantees that the contained IP header is aligned to a four-byte |
|
* boundary. In the case of regular frames, this simply means aligning the |
|
* payload to a four-byte boundary (because either the IP header is directly |
|
* contained, or IV/RFC1042 headers that have a length divisible by four are |
|
* in front of it). If the payload data is not properly aligned and the |
|
* architecture doesn't support efficient unaligned operations, mac80211 |
|
* will align the data. |
|
* |
|
* With A-MSDU frames, however, the payload data address must yield two modulo |
|
* four because there are 14-byte 802.3 headers within the A-MSDU frames that |
|
* push the IP header further back to a multiple of four again. Thankfully, the |
|
* specs were sane enough this time around to require padding each A-MSDU |
|
* subframe to a length that is a multiple of four. |
|
* |
|
* Padding like Atheros hardware adds which is between the 802.11 header and |
|
* the payload is not supported, the driver is required to move the 802.11 |
|
* header to be directly in front of the payload in that case. |
|
*/ |
|
static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx) |
|
{ |
|
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
|
WARN_ON_ONCE((unsigned long)rx->skb->data & 1); |
|
#endif |
|
} |
|
|
|
|
|
/* rx handlers */ |
|
|
|
static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb) |
|
{ |
|
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; |
|
|
|
if (is_multicast_ether_addr(hdr->addr1)) |
|
return 0; |
|
|
|
return ieee80211_is_robust_mgmt_frame(skb); |
|
} |
|
|
|
|
|
static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb) |
|
{ |
|
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; |
|
|
|
if (!is_multicast_ether_addr(hdr->addr1)) |
|
return 0; |
|
|
|
return ieee80211_is_robust_mgmt_frame(skb); |
|
} |
|
|
|
|
|
/* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */ |
|
static int ieee80211_get_mmie_keyidx(struct sk_buff *skb) |
|
{ |
|
struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data; |
|
struct ieee80211_mmie *mmie; |
|
struct ieee80211_mmie_16 *mmie16; |
|
|
|
if (skb->len < 24 + sizeof(*mmie) || !is_multicast_ether_addr(hdr->da)) |
|
return -1; |
|
|
|
if (!ieee80211_is_robust_mgmt_frame(skb) && |
|
!ieee80211_is_beacon(hdr->frame_control)) |
|
return -1; /* not a robust management frame */ |
|
|
|
mmie = (struct ieee80211_mmie *) |
|
(skb->data + skb->len - sizeof(*mmie)); |
|
if (mmie->element_id == WLAN_EID_MMIE && |
|
mmie->length == sizeof(*mmie) - 2) |
|
return le16_to_cpu(mmie->key_id); |
|
|
|
mmie16 = (struct ieee80211_mmie_16 *) |
|
(skb->data + skb->len - sizeof(*mmie16)); |
|
if (skb->len >= 24 + sizeof(*mmie16) && |
|
mmie16->element_id == WLAN_EID_MMIE && |
|
mmie16->length == sizeof(*mmie16) - 2) |
|
return le16_to_cpu(mmie16->key_id); |
|
|
|
return -1; |
|
} |
|
|
|
static int ieee80211_get_keyid(struct sk_buff *skb, |
|
const struct ieee80211_cipher_scheme *cs) |
|
{ |
|
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; |
|
__le16 fc; |
|
int hdrlen; |
|
int minlen; |
|
u8 key_idx_off; |
|
u8 key_idx_shift; |
|
u8 keyid; |
|
|
|
fc = hdr->frame_control; |
|
hdrlen = ieee80211_hdrlen(fc); |
|
|
|
if (cs) { |
|
minlen = hdrlen + cs->hdr_len; |
|
key_idx_off = hdrlen + cs->key_idx_off; |
|
key_idx_shift = cs->key_idx_shift; |
|
} else { |
|
/* WEP, TKIP, CCMP and GCMP */ |
|
minlen = hdrlen + IEEE80211_WEP_IV_LEN; |
|
key_idx_off = hdrlen + 3; |
|
key_idx_shift = 6; |
|
} |
|
|
|
if (unlikely(skb->len < minlen)) |
|
return -EINVAL; |
|
|
|
skb_copy_bits(skb, key_idx_off, &keyid, 1); |
|
|
|
if (cs) |
|
keyid &= cs->key_idx_mask; |
|
keyid >>= key_idx_shift; |
|
|
|
/* cs could use more than the usual two bits for the keyid */ |
|
if (unlikely(keyid >= NUM_DEFAULT_KEYS)) |
|
return -EINVAL; |
|
|
|
return keyid; |
|
} |
|
|
|
static ieee80211_rx_result ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx) |
|
{ |
|
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
|
char *dev_addr = rx->sdata->vif.addr; |
|
|
|
if (ieee80211_is_data(hdr->frame_control)) { |
|
if (is_multicast_ether_addr(hdr->addr1)) { |
|
if (ieee80211_has_tods(hdr->frame_control) || |
|
!ieee80211_has_fromds(hdr->frame_control)) |
|
return RX_DROP_MONITOR; |
|
if (ether_addr_equal(hdr->addr3, dev_addr)) |
|
return RX_DROP_MONITOR; |
|
} else { |
|
if (!ieee80211_has_a4(hdr->frame_control)) |
|
return RX_DROP_MONITOR; |
|
if (ether_addr_equal(hdr->addr4, dev_addr)) |
|
return RX_DROP_MONITOR; |
|
} |
|
} |
|
|
|
/* If there is not an established peer link and this is not a peer link |
|
* establisment frame, beacon or probe, drop the frame. |
|
*/ |
|
|
|
if (!rx->sta || sta_plink_state(rx->sta) != NL80211_PLINK_ESTAB) { |
|
struct ieee80211_mgmt *mgmt; |
|
|
|
if (!ieee80211_is_mgmt(hdr->frame_control)) |
|
return RX_DROP_MONITOR; |
|
|
|
if (ieee80211_is_action(hdr->frame_control)) { |
|
u8 category; |
|
|
|
/* make sure category field is present */ |
|
if (rx->skb->len < IEEE80211_MIN_ACTION_SIZE) |
|
return RX_DROP_MONITOR; |
|
|
|
mgmt = (struct ieee80211_mgmt *)hdr; |
|
category = mgmt->u.action.category; |
|
if (category != WLAN_CATEGORY_MESH_ACTION && |
|
category != WLAN_CATEGORY_SELF_PROTECTED) |
|
return RX_DROP_MONITOR; |
|
return RX_CONTINUE; |
|
} |
|
|
|
if (ieee80211_is_probe_req(hdr->frame_control) || |
|
ieee80211_is_probe_resp(hdr->frame_control) || |
|
ieee80211_is_beacon(hdr->frame_control) || |
|
ieee80211_is_auth(hdr->frame_control)) |
|
return RX_CONTINUE; |
|
|
|
return RX_DROP_MONITOR; |
|
} |
|
|
|
return RX_CONTINUE; |
|
} |
|
|
|
static inline bool ieee80211_rx_reorder_ready(struct tid_ampdu_rx *tid_agg_rx, |
|
int index) |
|
{ |
|
struct sk_buff_head *frames = &tid_agg_rx->reorder_buf[index]; |
|
struct sk_buff *tail = skb_peek_tail(frames); |
|
struct ieee80211_rx_status *status; |
|
|
|
if (tid_agg_rx->reorder_buf_filtered & BIT_ULL(index)) |
|
return true; |
|
|
|
if (!tail) |
|
return false; |
|
|
|
status = IEEE80211_SKB_RXCB(tail); |
|
if (status->flag & RX_FLAG_AMSDU_MORE) |
|
return false; |
|
|
|
return true; |
|
} |
|
|
|
static void ieee80211_release_reorder_frame(struct ieee80211_sub_if_data *sdata, |
|
struct tid_ampdu_rx *tid_agg_rx, |
|
int index, |
|
struct sk_buff_head *frames) |
|
{ |
|
struct sk_buff_head *skb_list = &tid_agg_rx->reorder_buf[index]; |
|
struct sk_buff *skb; |
|
struct ieee80211_rx_status *status; |
|
|
|
lockdep_assert_held(&tid_agg_rx->reorder_lock); |
|
|
|
if (skb_queue_empty(skb_list)) |
|
goto no_frame; |
|
|
|
if (!ieee80211_rx_reorder_ready(tid_agg_rx, index)) { |
|
__skb_queue_purge(skb_list); |
|
goto no_frame; |
|
} |
|
|
|
/* release frames from the reorder ring buffer */ |
|
tid_agg_rx->stored_mpdu_num--; |
|
while ((skb = __skb_dequeue(skb_list))) { |
|
status = IEEE80211_SKB_RXCB(skb); |
|
status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE; |
|
__skb_queue_tail(frames, skb); |
|
} |
|
|
|
no_frame: |
|
tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index); |
|
tid_agg_rx->head_seq_num = ieee80211_sn_inc(tid_agg_rx->head_seq_num); |
|
} |
|
|
|
static void ieee80211_release_reorder_frames(struct ieee80211_sub_if_data *sdata, |
|
struct tid_ampdu_rx *tid_agg_rx, |
|
u16 head_seq_num, |
|
struct sk_buff_head *frames) |
|
{ |
|
int index; |
|
|
|
lockdep_assert_held(&tid_agg_rx->reorder_lock); |
|
|
|
while (ieee80211_sn_less(tid_agg_rx->head_seq_num, head_seq_num)) { |
|
index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size; |
|
ieee80211_release_reorder_frame(sdata, tid_agg_rx, index, |
|
frames); |
|
} |
|
} |
|
|
|
/* |
|
* Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If |
|
* the skb was added to the buffer longer than this time ago, the earlier |
|
* frames that have not yet been received are assumed to be lost and the skb |
|
* can be released for processing. This may also release other skb's from the |
|
* reorder buffer if there are no additional gaps between the frames. |
|
* |
|
* Callers must hold tid_agg_rx->reorder_lock. |
|
*/ |
|
#define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10) |
|
|
|
static void ieee80211_sta_reorder_release(struct ieee80211_sub_if_data *sdata, |
|
struct tid_ampdu_rx *tid_agg_rx, |
|
struct sk_buff_head *frames) |
|
{ |
|
int index, i, j; |
|
|
|
lockdep_assert_held(&tid_agg_rx->reorder_lock); |
|
|
|
/* release the buffer until next missing frame */ |
|
index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size; |
|
if (!ieee80211_rx_reorder_ready(tid_agg_rx, index) && |
|
tid_agg_rx->stored_mpdu_num) { |
|
/* |
|
* No buffers ready to be released, but check whether any |
|
* frames in the reorder buffer have timed out. |
|
*/ |
|
int skipped = 1; |
|
for (j = (index + 1) % tid_agg_rx->buf_size; j != index; |
|
j = (j + 1) % tid_agg_rx->buf_size) { |
|
if (!ieee80211_rx_reorder_ready(tid_agg_rx, j)) { |
|
skipped++; |
|
continue; |
|
} |
|
if (skipped && |
|
!time_after(jiffies, tid_agg_rx->reorder_time[j] + |
|
HT_RX_REORDER_BUF_TIMEOUT)) |
|
goto set_release_timer; |
|
|
|
/* don't leave incomplete A-MSDUs around */ |
|
for (i = (index + 1) % tid_agg_rx->buf_size; i != j; |
|
i = (i + 1) % tid_agg_rx->buf_size) |
|
__skb_queue_purge(&tid_agg_rx->reorder_buf[i]); |
|
|
|
ht_dbg_ratelimited(sdata, |
|
"release an RX reorder frame due to timeout on earlier frames\n"); |
|
ieee80211_release_reorder_frame(sdata, tid_agg_rx, j, |
|
frames); |
|
|
|
/* |
|
* Increment the head seq# also for the skipped slots. |
|
*/ |
|
tid_agg_rx->head_seq_num = |
|
(tid_agg_rx->head_seq_num + |
|
skipped) & IEEE80211_SN_MASK; |
|
skipped = 0; |
|
} |
|
} else while (ieee80211_rx_reorder_ready(tid_agg_rx, index)) { |
|
ieee80211_release_reorder_frame(sdata, tid_agg_rx, index, |
|
frames); |
|
index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size; |
|
} |
|
|
|
if (tid_agg_rx->stored_mpdu_num) { |
|
j = index = tid_agg_rx->head_seq_num % tid_agg_rx->buf_size; |
|
|
|
for (; j != (index - 1) % tid_agg_rx->buf_size; |
|
j = (j + 1) % tid_agg_rx->buf_size) { |
|
if (ieee80211_rx_reorder_ready(tid_agg_rx, j)) |
|
break; |
|
} |
|
|
|
set_release_timer: |
|
|
|
if (!tid_agg_rx->removed) |
|
mod_timer(&tid_agg_rx->reorder_timer, |
|
tid_agg_rx->reorder_time[j] + 1 + |
|
HT_RX_REORDER_BUF_TIMEOUT); |
|
} else { |
|
del_timer(&tid_agg_rx->reorder_timer); |
|
} |
|
} |
|
|
|
/* |
|
* As this function belongs to the RX path it must be under |
|
* rcu_read_lock protection. It returns false if the frame |
|
* can be processed immediately, true if it was consumed. |
|
*/ |
|
static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_sub_if_data *sdata, |
|
struct tid_ampdu_rx *tid_agg_rx, |
|
struct sk_buff *skb, |
|
struct sk_buff_head *frames) |
|
{ |
|
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; |
|
struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
|
u16 sc = le16_to_cpu(hdr->seq_ctrl); |
|
u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4; |
|
u16 head_seq_num, buf_size; |
|
int index; |
|
bool ret = true; |
|
|
|
spin_lock(&tid_agg_rx->reorder_lock); |
|
|
|
/* |
|
* Offloaded BA sessions have no known starting sequence number so pick |
|
* one from first Rxed frame for this tid after BA was started. |
|
*/ |
|
if (unlikely(tid_agg_rx->auto_seq)) { |
|
tid_agg_rx->auto_seq = false; |
|
tid_agg_rx->ssn = mpdu_seq_num; |
|
tid_agg_rx->head_seq_num = mpdu_seq_num; |
|
} |
|
|
|
buf_size = tid_agg_rx->buf_size; |
|
head_seq_num = tid_agg_rx->head_seq_num; |
|
|
|
/* |
|
* If the current MPDU's SN is smaller than the SSN, it shouldn't |
|
* be reordered. |
|
*/ |
|
if (unlikely(!tid_agg_rx->started)) { |
|
if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) { |
|
ret = false; |
|
goto out; |
|
} |
|
tid_agg_rx->started = true; |
|
} |
|
|
|
/* frame with out of date sequence number */ |
|
if (ieee80211_sn_less(mpdu_seq_num, head_seq_num)) { |
|
dev_kfree_skb(skb); |
|
goto out; |
|
} |
|
|
|
/* |
|
* If frame the sequence number exceeds our buffering window |
|
* size release some previous frames to make room for this one. |
|
*/ |
|
if (!ieee80211_sn_less(mpdu_seq_num, head_seq_num + buf_size)) { |
|
head_seq_num = ieee80211_sn_inc( |
|
ieee80211_sn_sub(mpdu_seq_num, buf_size)); |
|
/* release stored frames up to new head to stack */ |
|
ieee80211_release_reorder_frames(sdata, tid_agg_rx, |
|
head_seq_num, frames); |
|
} |
|
|
|
/* Now the new frame is always in the range of the reordering buffer */ |
|
|
|
index = mpdu_seq_num % tid_agg_rx->buf_size; |
|
|
|
/* check if we already stored this frame */ |
|
if (ieee80211_rx_reorder_ready(tid_agg_rx, index)) { |
|
dev_kfree_skb(skb); |
|
goto out; |
|
} |
|
|
|
/* |
|
* If the current MPDU is in the right order and nothing else |
|
* is stored we can process it directly, no need to buffer it. |
|
* If it is first but there's something stored, we may be able |
|
* to release frames after this one. |
|
*/ |
|
if (mpdu_seq_num == tid_agg_rx->head_seq_num && |
|
tid_agg_rx->stored_mpdu_num == 0) { |
|
if (!(status->flag & RX_FLAG_AMSDU_MORE)) |
|
tid_agg_rx->head_seq_num = |
|
ieee80211_sn_inc(tid_agg_rx->head_seq_num); |
|
ret = false; |
|
goto out; |
|
} |
|
|
|
/* put the frame in the reordering buffer */ |
|
__skb_queue_tail(&tid_agg_rx->reorder_buf[index], skb); |
|
if (!(status->flag & RX_FLAG_AMSDU_MORE)) { |
|
tid_agg_rx->reorder_time[index] = jiffies; |
|
tid_agg_rx->stored_mpdu_num++; |
|
ieee80211_sta_reorder_release(sdata, tid_agg_rx, frames); |
|
} |
|
|
|
out: |
|
spin_unlock(&tid_agg_rx->reorder_lock); |
|
return ret; |
|
} |
|
|
|
/* |
|
* Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns |
|
* true if the MPDU was buffered, false if it should be processed. |
|
*/ |
|
static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx, |
|
struct sk_buff_head *frames) |
|
{ |
|
struct sk_buff *skb = rx->skb; |
|
struct ieee80211_local *local = rx->local; |
|
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; |
|
struct sta_info *sta = rx->sta; |
|
struct tid_ampdu_rx *tid_agg_rx; |
|
u16 sc; |
|
u8 tid, ack_policy; |
|
|
|
if (!ieee80211_is_data_qos(hdr->frame_control) || |
|
is_multicast_ether_addr(hdr->addr1)) |
|
goto dont_reorder; |
|
|
|
/* |
|
* filter the QoS data rx stream according to |
|
* STA/TID and check if this STA/TID is on aggregation |
|
*/ |
|
|
|
if (!sta) |
|
goto dont_reorder; |
|
|
|
ack_policy = *ieee80211_get_qos_ctl(hdr) & |
|
IEEE80211_QOS_CTL_ACK_POLICY_MASK; |
|
tid = ieee80211_get_tid(hdr); |
|
|
|
tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]); |
|
if (!tid_agg_rx) { |
|
if (ack_policy == IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK && |
|
!test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) && |
|
!test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg)) |
|
ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid, |
|
WLAN_BACK_RECIPIENT, |
|
WLAN_REASON_QSTA_REQUIRE_SETUP); |
|
goto dont_reorder; |
|
} |
|
|
|
/* qos null data frames are excluded */ |
|
if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC))) |
|
goto dont_reorder; |
|
|
|
/* not part of a BA session */ |
|
if (ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_BLOCKACK && |
|
ack_policy != IEEE80211_QOS_CTL_ACK_POLICY_NORMAL) |
|
goto dont_reorder; |
|
|
|
/* new, potentially un-ordered, ampdu frame - process it */ |
|
|
|
/* reset session timer */ |
|
if (tid_agg_rx->timeout) |
|
tid_agg_rx->last_rx = jiffies; |
|
|
|
/* if this mpdu is fragmented - terminate rx aggregation session */ |
|
sc = le16_to_cpu(hdr->seq_ctrl); |
|
if (sc & IEEE80211_SCTL_FRAG) { |
|
skb_queue_tail(&rx->sdata->skb_queue, skb); |
|
ieee80211_queue_work(&local->hw, &rx->sdata->work); |
|
return; |
|
} |
|
|
|
/* |
|
* No locking needed -- we will only ever process one |
|
* RX packet at a time, and thus own tid_agg_rx. All |
|
* other code manipulating it needs to (and does) make |
|
* sure that we cannot get to it any more before doing |
|
* anything with it. |
|
*/ |
|
if (ieee80211_sta_manage_reorder_buf(rx->sdata, tid_agg_rx, skb, |
|
frames)) |
|
return; |
|
|
|
dont_reorder: |
|
__skb_queue_tail(frames, skb); |
|
} |
|
|
|
static ieee80211_rx_result debug_noinline |
|
ieee80211_rx_h_check_dup(struct ieee80211_rx_data *rx) |
|
{ |
|
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
|
struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); |
|
|
|
if (status->flag & RX_FLAG_DUP_VALIDATED) |
|
return RX_CONTINUE; |
|
|
|
/* |
|
* Drop duplicate 802.11 retransmissions |
|
* (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery") |
|
*/ |
|
|
|
if (rx->skb->len < 24) |
|
return RX_CONTINUE; |
|
|
|
if (ieee80211_is_ctl(hdr->frame_control) || |
|
ieee80211_is_any_nullfunc(hdr->frame_control) || |
|
is_multicast_ether_addr(hdr->addr1)) |
|
return RX_CONTINUE; |
|
|
|
if (!rx->sta) |
|
return RX_CONTINUE; |
|
|
|
if (unlikely(ieee80211_has_retry(hdr->frame_control) && |
|
rx->sta->last_seq_ctrl[rx->seqno_idx] == hdr->seq_ctrl)) { |
|
I802_DEBUG_INC(rx->local->dot11FrameDuplicateCount); |
|
rx->sta->rx_stats.num_duplicates++; |
|
return RX_DROP_UNUSABLE; |
|
} else if (!(status->flag & RX_FLAG_AMSDU_MORE)) { |
|
rx->sta->last_seq_ctrl[rx->seqno_idx] = hdr->seq_ctrl; |
|
} |
|
|
|
return RX_CONTINUE; |
|
} |
|
|
|
static ieee80211_rx_result debug_noinline |
|
ieee80211_rx_h_check(struct ieee80211_rx_data *rx) |
|
{ |
|
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
|
|
|
/* Drop disallowed frame classes based on STA auth/assoc state; |
|
* IEEE 802.11, Chap 5.5. |
|
* |
|
* mac80211 filters only based on association state, i.e. it drops |
|
* Class 3 frames from not associated stations. hostapd sends |
|
* deauth/disassoc frames when needed. In addition, hostapd is |
|
* responsible for filtering on both auth and assoc states. |
|
*/ |
|
|
|
if (ieee80211_vif_is_mesh(&rx->sdata->vif)) |
|
return ieee80211_rx_mesh_check(rx); |
|
|
|
if (unlikely((ieee80211_is_data(hdr->frame_control) || |
|
ieee80211_is_pspoll(hdr->frame_control)) && |
|
rx->sdata->vif.type != NL80211_IFTYPE_ADHOC && |
|
rx->sdata->vif.type != NL80211_IFTYPE_OCB && |
|
(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_ASSOC)))) { |
|
/* |
|
* accept port control frames from the AP even when it's not |
|
* yet marked ASSOC to prevent a race where we don't set the |
|
* assoc bit quickly enough before it sends the first frame |
|
*/ |
|
if (rx->sta && rx->sdata->vif.type == NL80211_IFTYPE_STATION && |
|
ieee80211_is_data_present(hdr->frame_control)) { |
|
unsigned int hdrlen; |
|
__be16 ethertype; |
|
|
|
hdrlen = ieee80211_hdrlen(hdr->frame_control); |
|
|
|
if (rx->skb->len < hdrlen + 8) |
|
return RX_DROP_MONITOR; |
|
|
|
skb_copy_bits(rx->skb, hdrlen + 6, ðertype, 2); |
|
if (ethertype == rx->sdata->control_port_protocol) |
|
return RX_CONTINUE; |
|
} |
|
|
|
if (rx->sdata->vif.type == NL80211_IFTYPE_AP && |
|
cfg80211_rx_spurious_frame(rx->sdata->dev, |
|
hdr->addr2, |
|
GFP_ATOMIC)) |
|
return RX_DROP_UNUSABLE; |
|
|
|
return RX_DROP_MONITOR; |
|
} |
|
|
|
return RX_CONTINUE; |
|
} |
|
|
|
|
|
static ieee80211_rx_result debug_noinline |
|
ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx) |
|
{ |
|
struct ieee80211_local *local; |
|
struct ieee80211_hdr *hdr; |
|
struct sk_buff *skb; |
|
|
|
local = rx->local; |
|
skb = rx->skb; |
|
hdr = (struct ieee80211_hdr *) skb->data; |
|
|
|
if (!local->pspolling) |
|
return RX_CONTINUE; |
|
|
|
if (!ieee80211_has_fromds(hdr->frame_control)) |
|
/* this is not from AP */ |
|
return RX_CONTINUE; |
|
|
|
if (!ieee80211_is_data(hdr->frame_control)) |
|
return RX_CONTINUE; |
|
|
|
if (!ieee80211_has_moredata(hdr->frame_control)) { |
|
/* AP has no more frames buffered for us */ |
|
local->pspolling = false; |
|
return RX_CONTINUE; |
|
} |
|
|
|
/* more data bit is set, let's request a new frame from the AP */ |
|
ieee80211_send_pspoll(local, rx->sdata); |
|
|
|
return RX_CONTINUE; |
|
} |
|
|
|
static void sta_ps_start(struct sta_info *sta) |
|
{ |
|
struct ieee80211_sub_if_data *sdata = sta->sdata; |
|
struct ieee80211_local *local = sdata->local; |
|
struct ps_data *ps; |
|
int tid; |
|
|
|
if (sta->sdata->vif.type == NL80211_IFTYPE_AP || |
|
sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) |
|
ps = &sdata->bss->ps; |
|
else |
|
return; |
|
|
|
atomic_inc(&ps->num_sta_ps); |
|
set_sta_flag(sta, WLAN_STA_PS_STA); |
|
if (!ieee80211_hw_check(&local->hw, AP_LINK_PS)) |
|
drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta); |
|
ps_dbg(sdata, "STA %pM aid %d enters power save mode\n", |
|
sta->sta.addr, sta->sta.aid); |
|
|
|
ieee80211_clear_fast_xmit(sta); |
|
|
|
if (!sta->sta.txq[0]) |
|
return; |
|
|
|
for (tid = 0; tid < IEEE80211_NUM_TIDS; tid++) { |
|
struct ieee80211_txq *txq = sta->sta.txq[tid]; |
|
struct txq_info *txqi = to_txq_info(txq); |
|
|
|
spin_lock(&local->active_txq_lock[txq->ac]); |
|
if (!list_empty(&txqi->schedule_order)) |
|
list_del_init(&txqi->schedule_order); |
|
spin_unlock(&local->active_txq_lock[txq->ac]); |
|
|
|
if (txq_has_queue(txq)) |
|
set_bit(tid, &sta->txq_buffered_tids); |
|
else |
|
clear_bit(tid, &sta->txq_buffered_tids); |
|
} |
|
} |
|
|
|
static void sta_ps_end(struct sta_info *sta) |
|
{ |
|
ps_dbg(sta->sdata, "STA %pM aid %d exits power save mode\n", |
|
sta->sta.addr, sta->sta.aid); |
|
|
|
if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) { |
|
/* |
|
* Clear the flag only if the other one is still set |
|
* so that the TX path won't start TX'ing new frames |
|
* directly ... In the case that the driver flag isn't |
|
* set ieee80211_sta_ps_deliver_wakeup() will clear it. |
|
*/ |
|
clear_sta_flag(sta, WLAN_STA_PS_STA); |
|
ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n", |
|
sta->sta.addr, sta->sta.aid); |
|
return; |
|
} |
|
|
|
set_sta_flag(sta, WLAN_STA_PS_DELIVER); |
|
clear_sta_flag(sta, WLAN_STA_PS_STA); |
|
ieee80211_sta_ps_deliver_wakeup(sta); |
|
} |
|
|
|
int ieee80211_sta_ps_transition(struct ieee80211_sta *pubsta, bool start) |
|
{ |
|
struct sta_info *sta = container_of(pubsta, struct sta_info, sta); |
|
bool in_ps; |
|
|
|
WARN_ON(!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS)); |
|
|
|
/* Don't let the same PS state be set twice */ |
|
in_ps = test_sta_flag(sta, WLAN_STA_PS_STA); |
|
if ((start && in_ps) || (!start && !in_ps)) |
|
return -EINVAL; |
|
|
|
if (start) |
|
sta_ps_start(sta); |
|
else |
|
sta_ps_end(sta); |
|
|
|
return 0; |
|
} |
|
EXPORT_SYMBOL(ieee80211_sta_ps_transition); |
|
|
|
void ieee80211_sta_pspoll(struct ieee80211_sta *pubsta) |
|
{ |
|
struct sta_info *sta = container_of(pubsta, struct sta_info, sta); |
|
|
|
if (test_sta_flag(sta, WLAN_STA_SP)) |
|
return; |
|
|
|
if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER)) |
|
ieee80211_sta_ps_deliver_poll_response(sta); |
|
else |
|
set_sta_flag(sta, WLAN_STA_PSPOLL); |
|
} |
|
EXPORT_SYMBOL(ieee80211_sta_pspoll); |
|
|
|
void ieee80211_sta_uapsd_trigger(struct ieee80211_sta *pubsta, u8 tid) |
|
{ |
|
struct sta_info *sta = container_of(pubsta, struct sta_info, sta); |
|
int ac = ieee80211_ac_from_tid(tid); |
|
|
|
/* |
|
* If this AC is not trigger-enabled do nothing unless the |
|
* driver is calling us after it already checked. |
|
* |
|
* NB: This could/should check a separate bitmap of trigger- |
|
* enabled queues, but for now we only implement uAPSD w/o |
|
* TSPEC changes to the ACs, so they're always the same. |
|
*/ |
|
if (!(sta->sta.uapsd_queues & ieee80211_ac_to_qos_mask[ac]) && |
|
tid != IEEE80211_NUM_TIDS) |
|
return; |
|
|
|
/* if we are in a service period, do nothing */ |
|
if (test_sta_flag(sta, WLAN_STA_SP)) |
|
return; |
|
|
|
if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER)) |
|
ieee80211_sta_ps_deliver_uapsd(sta); |
|
else |
|
set_sta_flag(sta, WLAN_STA_UAPSD); |
|
} |
|
EXPORT_SYMBOL(ieee80211_sta_uapsd_trigger); |
|
|
|
static ieee80211_rx_result debug_noinline |
|
ieee80211_rx_h_uapsd_and_pspoll(struct ieee80211_rx_data *rx) |
|
{ |
|
struct ieee80211_sub_if_data *sdata = rx->sdata; |
|
struct ieee80211_hdr *hdr = (void *)rx->skb->data; |
|
struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); |
|
|
|
if (!rx->sta) |
|
return RX_CONTINUE; |
|
|
|
if (sdata->vif.type != NL80211_IFTYPE_AP && |
|
sdata->vif.type != NL80211_IFTYPE_AP_VLAN) |
|
return RX_CONTINUE; |
|
|
|
/* |
|
* The device handles station powersave, so don't do anything about |
|
* uAPSD and PS-Poll frames (the latter shouldn't even come up from |
|
* it to mac80211 since they're handled.) |
|
*/ |
|
if (ieee80211_hw_check(&sdata->local->hw, AP_LINK_PS)) |
|
return RX_CONTINUE; |
|
|
|
/* |
|
* Don't do anything if the station isn't already asleep. In |
|
* the uAPSD case, the station will probably be marked asleep, |
|
* in the PS-Poll case the station must be confused ... |
|
*/ |
|
if (!test_sta_flag(rx->sta, WLAN_STA_PS_STA)) |
|
return RX_CONTINUE; |
|
|
|
if (unlikely(ieee80211_is_pspoll(hdr->frame_control))) { |
|
ieee80211_sta_pspoll(&rx->sta->sta); |
|
|
|
/* Free PS Poll skb here instead of returning RX_DROP that would |
|
* count as an dropped frame. */ |
|
dev_kfree_skb(rx->skb); |
|
|
|
return RX_QUEUED; |
|
} else if (!ieee80211_has_morefrags(hdr->frame_control) && |
|
!(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) && |
|
ieee80211_has_pm(hdr->frame_control) && |
|
(ieee80211_is_data_qos(hdr->frame_control) || |
|
ieee80211_is_qos_nullfunc(hdr->frame_control))) { |
|
u8 tid = ieee80211_get_tid(hdr); |
|
|
|
ieee80211_sta_uapsd_trigger(&rx->sta->sta, tid); |
|
} |
|
|
|
return RX_CONTINUE; |
|
} |
|
|
|
static ieee80211_rx_result debug_noinline |
|
ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx) |
|
{ |
|
struct sta_info *sta = rx->sta; |
|
struct sk_buff *skb = rx->skb; |
|
struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
|
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; |
|
int i; |
|
|
|
if (!sta) |
|
return RX_CONTINUE; |
|
|
|
/* |
|
* Update last_rx only for IBSS packets which are for the current |
|
* BSSID and for station already AUTHORIZED to avoid keeping the |
|
* current IBSS network alive in cases where other STAs start |
|
* using different BSSID. This will also give the station another |
|
* chance to restart the authentication/authorization in case |
|
* something went wrong the first time. |
|
*/ |
|
if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) { |
|
u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len, |
|
NL80211_IFTYPE_ADHOC); |
|
if (ether_addr_equal(bssid, rx->sdata->u.ibss.bssid) && |
|
test_sta_flag(sta, WLAN_STA_AUTHORIZED)) { |
|
sta->rx_stats.last_rx = jiffies; |
|
if (ieee80211_is_data(hdr->frame_control) && |
|
!is_multicast_ether_addr(hdr->addr1)) |
|
sta->rx_stats.last_rate = |
|
sta_stats_encode_rate(status); |
|
} |
|
} else if (rx->sdata->vif.type == NL80211_IFTYPE_OCB) { |
|
sta->rx_stats.last_rx = jiffies; |
|
} else if (!ieee80211_is_s1g_beacon(hdr->frame_control) && |
|
!is_multicast_ether_addr(hdr->addr1)) { |
|
/* |
|
* Mesh beacons will update last_rx when if they are found to |
|
* match the current local configuration when processed. |
|
*/ |
|
sta->rx_stats.last_rx = jiffies; |
|
if (ieee80211_is_data(hdr->frame_control)) |
|
sta->rx_stats.last_rate = sta_stats_encode_rate(status); |
|
} |
|
|
|
sta->rx_stats.fragments++; |
|
|
|
u64_stats_update_begin(&rx->sta->rx_stats.syncp); |
|
sta->rx_stats.bytes += rx->skb->len; |
|
u64_stats_update_end(&rx->sta->rx_stats.syncp); |
|
|
|
if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) { |
|
sta->rx_stats.last_signal = status->signal; |
|
ewma_signal_add(&sta->rx_stats_avg.signal, -status->signal); |
|
} |
|
|
|
if (status->chains) { |
|
sta->rx_stats.chains = status->chains; |
|
for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) { |
|
int signal = status->chain_signal[i]; |
|
|
|
if (!(status->chains & BIT(i))) |
|
continue; |
|
|
|
sta->rx_stats.chain_signal_last[i] = signal; |
|
ewma_signal_add(&sta->rx_stats_avg.chain_signal[i], |
|
-signal); |
|
} |
|
} |
|
|
|
if (ieee80211_is_s1g_beacon(hdr->frame_control)) |
|
return RX_CONTINUE; |
|
|
|
/* |
|
* Change STA power saving mode only at the end of a frame |
|
* exchange sequence, and only for a data or management |
|
* frame as specified in IEEE 802.11-2016 11.2.3.2 |
|
*/ |
|
if (!ieee80211_hw_check(&sta->local->hw, AP_LINK_PS) && |
|
!ieee80211_has_morefrags(hdr->frame_control) && |
|
!is_multicast_ether_addr(hdr->addr1) && |
|
(ieee80211_is_mgmt(hdr->frame_control) || |
|
ieee80211_is_data(hdr->frame_control)) && |
|
!(status->rx_flags & IEEE80211_RX_DEFERRED_RELEASE) && |
|
(rx->sdata->vif.type == NL80211_IFTYPE_AP || |
|
rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) { |
|
if (test_sta_flag(sta, WLAN_STA_PS_STA)) { |
|
if (!ieee80211_has_pm(hdr->frame_control)) |
|
sta_ps_end(sta); |
|
} else { |
|
if (ieee80211_has_pm(hdr->frame_control)) |
|
sta_ps_start(sta); |
|
} |
|
} |
|
|
|
/* mesh power save support */ |
|
if (ieee80211_vif_is_mesh(&rx->sdata->vif)) |
|
ieee80211_mps_rx_h_sta_process(sta, hdr); |
|
|
|
/* |
|
* Drop (qos-)data::nullfunc frames silently, since they |
|
* are used only to control station power saving mode. |
|
*/ |
|
if (ieee80211_is_any_nullfunc(hdr->frame_control)) { |
|
I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc); |
|
|
|
/* |
|
* If we receive a 4-addr nullfunc frame from a STA |
|
* that was not moved to a 4-addr STA vlan yet send |
|
* the event to userspace and for older hostapd drop |
|
* the frame to the monitor interface. |
|
*/ |
|
if (ieee80211_has_a4(hdr->frame_control) && |
|
(rx->sdata->vif.type == NL80211_IFTYPE_AP || |
|
(rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN && |
|
!rx->sdata->u.vlan.sta))) { |
|
if (!test_and_set_sta_flag(sta, WLAN_STA_4ADDR_EVENT)) |
|
cfg80211_rx_unexpected_4addr_frame( |
|
rx->sdata->dev, sta->sta.addr, |
|
GFP_ATOMIC); |
|
return RX_DROP_MONITOR; |
|
} |
|
/* |
|
* Update counter and free packet here to avoid |
|
* counting this as a dropped packed. |
|
*/ |
|
sta->rx_stats.packets++; |
|
dev_kfree_skb(rx->skb); |
|
return RX_QUEUED; |
|
} |
|
|
|
return RX_CONTINUE; |
|
} /* ieee80211_rx_h_sta_process */ |
|
|
|
static struct ieee80211_key * |
|
ieee80211_rx_get_bigtk(struct ieee80211_rx_data *rx, int idx) |
|
{ |
|
struct ieee80211_key *key = NULL; |
|
struct ieee80211_sub_if_data *sdata = rx->sdata; |
|
int idx2; |
|
|
|
/* Make sure key gets set if either BIGTK key index is set so that |
|
* ieee80211_drop_unencrypted_mgmt() can properly drop both unprotected |
|
* Beacon frames and Beacon frames that claim to use another BIGTK key |
|
* index (i.e., a key that we do not have). |
|
*/ |
|
|
|
if (idx < 0) { |
|
idx = NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS; |
|
idx2 = idx + 1; |
|
} else { |
|
if (idx == NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS) |
|
idx2 = idx + 1; |
|
else |
|
idx2 = idx - 1; |
|
} |
|
|
|
if (rx->sta) |
|
key = rcu_dereference(rx->sta->gtk[idx]); |
|
if (!key) |
|
key = rcu_dereference(sdata->keys[idx]); |
|
if (!key && rx->sta) |
|
key = rcu_dereference(rx->sta->gtk[idx2]); |
|
if (!key) |
|
key = rcu_dereference(sdata->keys[idx2]); |
|
|
|
return key; |
|
} |
|
|
|
static ieee80211_rx_result debug_noinline |
|
ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx) |
|
{ |
|
struct sk_buff *skb = rx->skb; |
|
struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
|
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; |
|
int keyidx; |
|
ieee80211_rx_result result = RX_DROP_UNUSABLE; |
|
struct ieee80211_key *sta_ptk = NULL; |
|
struct ieee80211_key *ptk_idx = NULL; |
|
int mmie_keyidx = -1; |
|
__le16 fc; |
|
const struct ieee80211_cipher_scheme *cs = NULL; |
|
|
|
if (ieee80211_is_ext(hdr->frame_control)) |
|
return RX_CONTINUE; |
|
|
|
/* |
|
* Key selection 101 |
|
* |
|
* There are five types of keys: |
|
* - GTK (group keys) |
|
* - IGTK (group keys for management frames) |
|
* - BIGTK (group keys for Beacon frames) |
|
* - PTK (pairwise keys) |
|
* - STK (station-to-station pairwise keys) |
|
* |
|
* When selecting a key, we have to distinguish between multicast |
|
* (including broadcast) and unicast frames, the latter can only |
|
* use PTKs and STKs while the former always use GTKs, IGTKs, and |
|
* BIGTKs. Unless, of course, actual WEP keys ("pre-RSNA") are used, |
|
* then unicast frames can also use key indices like GTKs. Hence, if we |
|
* don't have a PTK/STK we check the key index for a WEP key. |
|
* |
|
* Note that in a regular BSS, multicast frames are sent by the |
|
* AP only, associated stations unicast the frame to the AP first |
|
* which then multicasts it on their behalf. |
|
* |
|
* There is also a slight problem in IBSS mode: GTKs are negotiated |
|
* with each station, that is something we don't currently handle. |
|
* The spec seems to expect that one negotiates the same key with |
|
* every station but there's no such requirement; VLANs could be |
|
* possible. |
|
*/ |
|
|
|
/* start without a key */ |
|
rx->key = NULL; |
|
fc = hdr->frame_control; |
|
|
|
if (rx->sta) { |
|
int keyid = rx->sta->ptk_idx; |
|
sta_ptk = rcu_dereference(rx->sta->ptk[keyid]); |
|
|
|
if (ieee80211_has_protected(fc)) { |
|
cs = rx->sta->cipher_scheme; |
|
keyid = ieee80211_get_keyid(rx->skb, cs); |
|
|
|
if (unlikely(keyid < 0)) |
|
return RX_DROP_UNUSABLE; |
|
|
|
ptk_idx = rcu_dereference(rx->sta->ptk[keyid]); |
|
} |
|
} |
|
|
|
if (!ieee80211_has_protected(fc)) |
|
mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb); |
|
|
|
if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) { |
|
rx->key = ptk_idx ? ptk_idx : sta_ptk; |
|
if ((status->flag & RX_FLAG_DECRYPTED) && |
|
(status->flag & RX_FLAG_IV_STRIPPED)) |
|
return RX_CONTINUE; |
|
/* Skip decryption if the frame is not protected. */ |
|
if (!ieee80211_has_protected(fc)) |
|
return RX_CONTINUE; |
|
} else if (mmie_keyidx >= 0 && ieee80211_is_beacon(fc)) { |
|
/* Broadcast/multicast robust management frame / BIP */ |
|
if ((status->flag & RX_FLAG_DECRYPTED) && |
|
(status->flag & RX_FLAG_IV_STRIPPED)) |
|
return RX_CONTINUE; |
|
|
|
if (mmie_keyidx < NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS || |
|
mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS + |
|
NUM_DEFAULT_BEACON_KEYS) { |
|
cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev, |
|
skb->data, |
|
skb->len); |
|
return RX_DROP_MONITOR; /* unexpected BIP keyidx */ |
|
} |
|
|
|
rx->key = ieee80211_rx_get_bigtk(rx, mmie_keyidx); |
|
if (!rx->key) |
|
return RX_CONTINUE; /* Beacon protection not in use */ |
|
} else if (mmie_keyidx >= 0) { |
|
/* Broadcast/multicast robust management frame / BIP */ |
|
if ((status->flag & RX_FLAG_DECRYPTED) && |
|
(status->flag & RX_FLAG_IV_STRIPPED)) |
|
return RX_CONTINUE; |
|
|
|
if (mmie_keyidx < NUM_DEFAULT_KEYS || |
|
mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS) |
|
return RX_DROP_MONITOR; /* unexpected BIP keyidx */ |
|
if (rx->sta) { |
|
if (ieee80211_is_group_privacy_action(skb) && |
|
test_sta_flag(rx->sta, WLAN_STA_MFP)) |
|
return RX_DROP_MONITOR; |
|
|
|
rx->key = rcu_dereference(rx->sta->gtk[mmie_keyidx]); |
|
} |
|
if (!rx->key) |
|
rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]); |
|
} else if (!ieee80211_has_protected(fc)) { |
|
/* |
|
* The frame was not protected, so skip decryption. However, we |
|
* need to set rx->key if there is a key that could have been |
|
* used so that the frame may be dropped if encryption would |
|
* have been expected. |
|
*/ |
|
struct ieee80211_key *key = NULL; |
|
struct ieee80211_sub_if_data *sdata = rx->sdata; |
|
int i; |
|
|
|
if (ieee80211_is_beacon(fc)) { |
|
key = ieee80211_rx_get_bigtk(rx, -1); |
|
} else if (ieee80211_is_mgmt(fc) && |
|
is_multicast_ether_addr(hdr->addr1)) { |
|
key = rcu_dereference(rx->sdata->default_mgmt_key); |
|
} else { |
|
if (rx->sta) { |
|
for (i = 0; i < NUM_DEFAULT_KEYS; i++) { |
|
key = rcu_dereference(rx->sta->gtk[i]); |
|
if (key) |
|
break; |
|
} |
|
} |
|
if (!key) { |
|
for (i = 0; i < NUM_DEFAULT_KEYS; i++) { |
|
key = rcu_dereference(sdata->keys[i]); |
|
if (key) |
|
break; |
|
} |
|
} |
|
} |
|
if (key) |
|
rx->key = key; |
|
return RX_CONTINUE; |
|
} else { |
|
/* |
|
* The device doesn't give us the IV so we won't be |
|
* able to look up the key. That's ok though, we |
|
* don't need to decrypt the frame, we just won't |
|
* be able to keep statistics accurate. |
|
* Except for key threshold notifications, should |
|
* we somehow allow the driver to tell us which key |
|
* the hardware used if this flag is set? |
|
*/ |
|
if ((status->flag & RX_FLAG_DECRYPTED) && |
|
(status->flag & RX_FLAG_IV_STRIPPED)) |
|
return RX_CONTINUE; |
|
|
|
keyidx = ieee80211_get_keyid(rx->skb, cs); |
|
|
|
if (unlikely(keyidx < 0)) |
|
return RX_DROP_UNUSABLE; |
|
|
|
/* check per-station GTK first, if multicast packet */ |
|
if (is_multicast_ether_addr(hdr->addr1) && rx->sta) |
|
rx->key = rcu_dereference(rx->sta->gtk[keyidx]); |
|
|
|
/* if not found, try default key */ |
|
if (!rx->key) { |
|
rx->key = rcu_dereference(rx->sdata->keys[keyidx]); |
|
|
|
/* |
|
* RSNA-protected unicast frames should always be |
|
* sent with pairwise or station-to-station keys, |
|
* but for WEP we allow using a key index as well. |
|
*/ |
|
if (rx->key && |
|
rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP40 && |
|
rx->key->conf.cipher != WLAN_CIPHER_SUITE_WEP104 && |
|
!is_multicast_ether_addr(hdr->addr1)) |
|
rx->key = NULL; |
|
} |
|
} |
|
|
|
if (rx->key) { |
|
if (unlikely(rx->key->flags & KEY_FLAG_TAINTED)) |
|
return RX_DROP_MONITOR; |
|
|
|
/* TODO: add threshold stuff again */ |
|
} else { |
|
return RX_DROP_MONITOR; |
|
} |
|
|
|
switch (rx->key->conf.cipher) { |
|
case WLAN_CIPHER_SUITE_WEP40: |
|
case WLAN_CIPHER_SUITE_WEP104: |
|
result = ieee80211_crypto_wep_decrypt(rx); |
|
break; |
|
case WLAN_CIPHER_SUITE_TKIP: |
|
result = ieee80211_crypto_tkip_decrypt(rx); |
|
break; |
|
case WLAN_CIPHER_SUITE_CCMP: |
|
result = ieee80211_crypto_ccmp_decrypt( |
|
rx, IEEE80211_CCMP_MIC_LEN); |
|
break; |
|
case WLAN_CIPHER_SUITE_CCMP_256: |
|
result = ieee80211_crypto_ccmp_decrypt( |
|
rx, IEEE80211_CCMP_256_MIC_LEN); |
|
break; |
|
case WLAN_CIPHER_SUITE_AES_CMAC: |
|
result = ieee80211_crypto_aes_cmac_decrypt(rx); |
|
break; |
|
case WLAN_CIPHER_SUITE_BIP_CMAC_256: |
|
result = ieee80211_crypto_aes_cmac_256_decrypt(rx); |
|
break; |
|
case WLAN_CIPHER_SUITE_BIP_GMAC_128: |
|
case WLAN_CIPHER_SUITE_BIP_GMAC_256: |
|
result = ieee80211_crypto_aes_gmac_decrypt(rx); |
|
break; |
|
case WLAN_CIPHER_SUITE_GCMP: |
|
case WLAN_CIPHER_SUITE_GCMP_256: |
|
result = ieee80211_crypto_gcmp_decrypt(rx); |
|
break; |
|
default: |
|
result = ieee80211_crypto_hw_decrypt(rx); |
|
} |
|
|
|
/* the hdr variable is invalid after the decrypt handlers */ |
|
|
|
/* either the frame has been decrypted or will be dropped */ |
|
status->flag |= RX_FLAG_DECRYPTED; |
|
|
|
if (unlikely(ieee80211_is_beacon(fc) && result == RX_DROP_UNUSABLE)) |
|
cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev, |
|
skb->data, skb->len); |
|
|
|
return result; |
|
} |
|
|
|
void ieee80211_init_frag_cache(struct ieee80211_fragment_cache *cache) |
|
{ |
|
int i; |
|
|
|
for (i = 0; i < ARRAY_SIZE(cache->entries); i++) |
|
skb_queue_head_init(&cache->entries[i].skb_list); |
|
} |
|
|
|
void ieee80211_destroy_frag_cache(struct ieee80211_fragment_cache *cache) |
|
{ |
|
int i; |
|
|
|
for (i = 0; i < ARRAY_SIZE(cache->entries); i++) |
|
__skb_queue_purge(&cache->entries[i].skb_list); |
|
} |
|
|
|
static inline struct ieee80211_fragment_entry * |
|
ieee80211_reassemble_add(struct ieee80211_fragment_cache *cache, |
|
unsigned int frag, unsigned int seq, int rx_queue, |
|
struct sk_buff **skb) |
|
{ |
|
struct ieee80211_fragment_entry *entry; |
|
|
|
entry = &cache->entries[cache->next++]; |
|
if (cache->next >= IEEE80211_FRAGMENT_MAX) |
|
cache->next = 0; |
|
|
|
__skb_queue_purge(&entry->skb_list); |
|
|
|
__skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */ |
|
*skb = NULL; |
|
entry->first_frag_time = jiffies; |
|
entry->seq = seq; |
|
entry->rx_queue = rx_queue; |
|
entry->last_frag = frag; |
|
entry->check_sequential_pn = false; |
|
entry->extra_len = 0; |
|
|
|
return entry; |
|
} |
|
|
|
static inline struct ieee80211_fragment_entry * |
|
ieee80211_reassemble_find(struct ieee80211_fragment_cache *cache, |
|
unsigned int frag, unsigned int seq, |
|
int rx_queue, struct ieee80211_hdr *hdr) |
|
{ |
|
struct ieee80211_fragment_entry *entry; |
|
int i, idx; |
|
|
|
idx = cache->next; |
|
for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) { |
|
struct ieee80211_hdr *f_hdr; |
|
struct sk_buff *f_skb; |
|
|
|
idx--; |
|
if (idx < 0) |
|
idx = IEEE80211_FRAGMENT_MAX - 1; |
|
|
|
entry = &cache->entries[idx]; |
|
if (skb_queue_empty(&entry->skb_list) || entry->seq != seq || |
|
entry->rx_queue != rx_queue || |
|
entry->last_frag + 1 != frag) |
|
continue; |
|
|
|
f_skb = __skb_peek(&entry->skb_list); |
|
f_hdr = (struct ieee80211_hdr *) f_skb->data; |
|
|
|
/* |
|
* Check ftype and addresses are equal, else check next fragment |
|
*/ |
|
if (((hdr->frame_control ^ f_hdr->frame_control) & |
|
cpu_to_le16(IEEE80211_FCTL_FTYPE)) || |
|
!ether_addr_equal(hdr->addr1, f_hdr->addr1) || |
|
!ether_addr_equal(hdr->addr2, f_hdr->addr2)) |
|
continue; |
|
|
|
if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) { |
|
__skb_queue_purge(&entry->skb_list); |
|
continue; |
|
} |
|
return entry; |
|
} |
|
|
|
return NULL; |
|
} |
|
|
|
static bool requires_sequential_pn(struct ieee80211_rx_data *rx, __le16 fc) |
|
{ |
|
return rx->key && |
|
(rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP || |
|
rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP_256 || |
|
rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP || |
|
rx->key->conf.cipher == WLAN_CIPHER_SUITE_GCMP_256) && |
|
ieee80211_has_protected(fc); |
|
} |
|
|
|
static ieee80211_rx_result debug_noinline |
|
ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx) |
|
{ |
|
struct ieee80211_fragment_cache *cache = &rx->sdata->frags; |
|
struct ieee80211_hdr *hdr; |
|
u16 sc; |
|
__le16 fc; |
|
unsigned int frag, seq; |
|
struct ieee80211_fragment_entry *entry; |
|
struct sk_buff *skb; |
|
struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); |
|
|
|
hdr = (struct ieee80211_hdr *)rx->skb->data; |
|
fc = hdr->frame_control; |
|
|
|
if (ieee80211_is_ctl(fc) || ieee80211_is_ext(fc)) |
|
return RX_CONTINUE; |
|
|
|
sc = le16_to_cpu(hdr->seq_ctrl); |
|
frag = sc & IEEE80211_SCTL_FRAG; |
|
|
|
if (is_multicast_ether_addr(hdr->addr1)) { |
|
I802_DEBUG_INC(rx->local->dot11MulticastReceivedFrameCount); |
|
goto out_no_led; |
|
} |
|
|
|
if (rx->sta) |
|
cache = &rx->sta->frags; |
|
|
|
if (likely(!ieee80211_has_morefrags(fc) && frag == 0)) |
|
goto out; |
|
|
|
I802_DEBUG_INC(rx->local->rx_handlers_fragments); |
|
|
|
if (skb_linearize(rx->skb)) |
|
return RX_DROP_UNUSABLE; |
|
|
|
/* |
|
* skb_linearize() might change the skb->data and |
|
* previously cached variables (in this case, hdr) need to |
|
* be refreshed with the new data. |
|
*/ |
|
hdr = (struct ieee80211_hdr *)rx->skb->data; |
|
seq = (sc & IEEE80211_SCTL_SEQ) >> 4; |
|
|
|
if (frag == 0) { |
|
/* This is the first fragment of a new frame. */ |
|
entry = ieee80211_reassemble_add(cache, frag, seq, |
|
rx->seqno_idx, &(rx->skb)); |
|
if (requires_sequential_pn(rx, fc)) { |
|
int queue = rx->security_idx; |
|
|
|
/* Store CCMP/GCMP PN so that we can verify that the |
|
* next fragment has a sequential PN value. |
|
*/ |
|
entry->check_sequential_pn = true; |
|
entry->is_protected = true; |
|
entry->key_color = rx->key->color; |
|
memcpy(entry->last_pn, |
|
rx->key->u.ccmp.rx_pn[queue], |
|
IEEE80211_CCMP_PN_LEN); |
|
BUILD_BUG_ON(offsetof(struct ieee80211_key, |
|
u.ccmp.rx_pn) != |
|
offsetof(struct ieee80211_key, |
|
u.gcmp.rx_pn)); |
|
BUILD_BUG_ON(sizeof(rx->key->u.ccmp.rx_pn[queue]) != |
|
sizeof(rx->key->u.gcmp.rx_pn[queue])); |
|
BUILD_BUG_ON(IEEE80211_CCMP_PN_LEN != |
|
IEEE80211_GCMP_PN_LEN); |
|
} else if (rx->key && |
|
(ieee80211_has_protected(fc) || |
|
(status->flag & RX_FLAG_DECRYPTED))) { |
|
entry->is_protected = true; |
|
entry->key_color = rx->key->color; |
|
} |
|
return RX_QUEUED; |
|
} |
|
|
|
/* This is a fragment for a frame that should already be pending in |
|
* fragment cache. Add this fragment to the end of the pending entry. |
|
*/ |
|
entry = ieee80211_reassemble_find(cache, frag, seq, |
|
rx->seqno_idx, hdr); |
|
if (!entry) { |
|
I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); |
|
return RX_DROP_MONITOR; |
|
} |
|
|
|
/* "The receiver shall discard MSDUs and MMPDUs whose constituent |
|
* MPDU PN values are not incrementing in steps of 1." |
|
* see IEEE P802.11-REVmc/D5.0, 12.5.3.4.4, item d (for CCMP) |
|
* and IEEE P802.11-REVmc/D5.0, 12.5.5.4.4, item d (for GCMP) |
|
*/ |
|
if (entry->check_sequential_pn) { |
|
int i; |
|
u8 pn[IEEE80211_CCMP_PN_LEN], *rpn; |
|
|
|
if (!requires_sequential_pn(rx, fc)) |
|
return RX_DROP_UNUSABLE; |
|
|
|
/* Prevent mixed key and fragment cache attacks */ |
|
if (entry->key_color != rx->key->color) |
|
return RX_DROP_UNUSABLE; |
|
|
|
memcpy(pn, entry->last_pn, IEEE80211_CCMP_PN_LEN); |
|
for (i = IEEE80211_CCMP_PN_LEN - 1; i >= 0; i--) { |
|
pn[i]++; |
|
if (pn[i]) |
|
break; |
|
} |
|
|
|
rpn = rx->ccm_gcm.pn; |
|
if (memcmp(pn, rpn, IEEE80211_CCMP_PN_LEN)) |
|
return RX_DROP_UNUSABLE; |
|
memcpy(entry->last_pn, pn, IEEE80211_CCMP_PN_LEN); |
|
} else if (entry->is_protected && |
|
(!rx->key || |
|
(!ieee80211_has_protected(fc) && |
|
!(status->flag & RX_FLAG_DECRYPTED)) || |
|
rx->key->color != entry->key_color)) { |
|
/* Drop this as a mixed key or fragment cache attack, even |
|
* if for TKIP Michael MIC should protect us, and WEP is a |
|
* lost cause anyway. |
|
*/ |
|
return RX_DROP_UNUSABLE; |
|
} else if (entry->is_protected && rx->key && |
|
entry->key_color != rx->key->color && |
|
(status->flag & RX_FLAG_DECRYPTED)) { |
|
return RX_DROP_UNUSABLE; |
|
} |
|
|
|
skb_pull(rx->skb, ieee80211_hdrlen(fc)); |
|
__skb_queue_tail(&entry->skb_list, rx->skb); |
|
entry->last_frag = frag; |
|
entry->extra_len += rx->skb->len; |
|
if (ieee80211_has_morefrags(fc)) { |
|
rx->skb = NULL; |
|
return RX_QUEUED; |
|
} |
|
|
|
rx->skb = __skb_dequeue(&entry->skb_list); |
|
if (skb_tailroom(rx->skb) < entry->extra_len) { |
|
I802_DEBUG_INC(rx->local->rx_expand_skb_head_defrag); |
|
if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len, |
|
GFP_ATOMIC))) { |
|
I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); |
|
__skb_queue_purge(&entry->skb_list); |
|
return RX_DROP_UNUSABLE; |
|
} |
|
} |
|
while ((skb = __skb_dequeue(&entry->skb_list))) { |
|
skb_put_data(rx->skb, skb->data, skb->len); |
|
dev_kfree_skb(skb); |
|
} |
|
|
|
out: |
|
ieee80211_led_rx(rx->local); |
|
out_no_led: |
|
if (rx->sta) |
|
rx->sta->rx_stats.packets++; |
|
return RX_CONTINUE; |
|
} |
|
|
|
static int ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx) |
|
{ |
|
if (unlikely(!rx->sta || !test_sta_flag(rx->sta, WLAN_STA_AUTHORIZED))) |
|
return -EACCES; |
|
|
|
return 0; |
|
} |
|
|
|
static int ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc) |
|
{ |
|
struct ieee80211_hdr *hdr = (void *)rx->skb->data; |
|
struct sk_buff *skb = rx->skb; |
|
struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
|
|
|
/* |
|
* Pass through unencrypted frames if the hardware has |
|
* decrypted them already. |
|
*/ |
|
if (status->flag & RX_FLAG_DECRYPTED) |
|
return 0; |
|
|
|
/* check mesh EAPOL frames first */ |
|
if (unlikely(rx->sta && ieee80211_vif_is_mesh(&rx->sdata->vif) && |
|
ieee80211_is_data(fc))) { |
|
struct ieee80211s_hdr *mesh_hdr; |
|
u16 hdr_len = ieee80211_hdrlen(fc); |
|
u16 ethertype_offset; |
|
__be16 ethertype; |
|
|
|
if (!ether_addr_equal(hdr->addr1, rx->sdata->vif.addr)) |
|
goto drop_check; |
|
|
|
/* make sure fixed part of mesh header is there, also checks skb len */ |
|
if (!pskb_may_pull(rx->skb, hdr_len + 6)) |
|
goto drop_check; |
|
|
|
mesh_hdr = (struct ieee80211s_hdr *)(skb->data + hdr_len); |
|
ethertype_offset = hdr_len + ieee80211_get_mesh_hdrlen(mesh_hdr) + |
|
sizeof(rfc1042_header); |
|
|
|
if (skb_copy_bits(rx->skb, ethertype_offset, ðertype, 2) == 0 && |
|
ethertype == rx->sdata->control_port_protocol) |
|
return 0; |
|
} |
|
|
|
drop_check: |
|
/* Drop unencrypted frames if key is set. */ |
|
if (unlikely(!ieee80211_has_protected(fc) && |
|
!ieee80211_is_any_nullfunc(fc) && |
|
ieee80211_is_data(fc) && rx->key)) |
|
return -EACCES; |
|
|
|
return 0; |
|
} |
|
|
|
static int ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx) |
|
{ |
|
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
|
struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); |
|
__le16 fc = hdr->frame_control; |
|
|
|
/* |
|
* Pass through unencrypted frames if the hardware has |
|
* decrypted them already. |
|
*/ |
|
if (status->flag & RX_FLAG_DECRYPTED) |
|
return 0; |
|
|
|
if (rx->sta && test_sta_flag(rx->sta, WLAN_STA_MFP)) { |
|
if (unlikely(!ieee80211_has_protected(fc) && |
|
ieee80211_is_unicast_robust_mgmt_frame(rx->skb) && |
|
rx->key)) { |
|
if (ieee80211_is_deauth(fc) || |
|
ieee80211_is_disassoc(fc)) |
|
cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev, |
|
rx->skb->data, |
|
rx->skb->len); |
|
return -EACCES; |
|
} |
|
/* BIP does not use Protected field, so need to check MMIE */ |
|
if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) && |
|
ieee80211_get_mmie_keyidx(rx->skb) < 0)) { |
|
if (ieee80211_is_deauth(fc) || |
|
ieee80211_is_disassoc(fc)) |
|
cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev, |
|
rx->skb->data, |
|
rx->skb->len); |
|
return -EACCES; |
|
} |
|
if (unlikely(ieee80211_is_beacon(fc) && rx->key && |
|
ieee80211_get_mmie_keyidx(rx->skb) < 0)) { |
|
cfg80211_rx_unprot_mlme_mgmt(rx->sdata->dev, |
|
rx->skb->data, |
|
rx->skb->len); |
|
return -EACCES; |
|
} |
|
/* |
|
* When using MFP, Action frames are not allowed prior to |
|
* having configured keys. |
|
*/ |
|
if (unlikely(ieee80211_is_action(fc) && !rx->key && |
|
ieee80211_is_robust_mgmt_frame(rx->skb))) |
|
return -EACCES; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static int |
|
__ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control) |
|
{ |
|
struct ieee80211_sub_if_data *sdata = rx->sdata; |
|
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
|
bool check_port_control = false; |
|
struct ethhdr *ehdr; |
|
int ret; |
|
|
|
*port_control = false; |
|
if (ieee80211_has_a4(hdr->frame_control) && |
|
sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta) |
|
return -1; |
|
|
|
if (sdata->vif.type == NL80211_IFTYPE_STATION && |
|
!!sdata->u.mgd.use_4addr != !!ieee80211_has_a4(hdr->frame_control)) { |
|
|
|
if (!sdata->u.mgd.use_4addr) |
|
return -1; |
|
else if (!ether_addr_equal(hdr->addr1, sdata->vif.addr)) |
|
check_port_control = true; |
|
} |
|
|
|
if (is_multicast_ether_addr(hdr->addr1) && |
|
sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta) |
|
return -1; |
|
|
|
ret = ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type); |
|
if (ret < 0) |
|
return ret; |
|
|
|
ehdr = (struct ethhdr *) rx->skb->data; |
|
if (ehdr->h_proto == rx->sdata->control_port_protocol) |
|
*port_control = true; |
|
else if (check_port_control) |
|
return -1; |
|
|
|
return 0; |
|
} |
|
|
|
/* |
|
* requires that rx->skb is a frame with ethernet header |
|
*/ |
|
static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc) |
|
{ |
|
static const u8 pae_group_addr[ETH_ALEN] __aligned(2) |
|
= { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 }; |
|
struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data; |
|
|
|
/* |
|
* Allow EAPOL frames to us/the PAE group address regardless of |
|
* whether the frame was encrypted or not, and always disallow |
|
* all other destination addresses for them. |
|
*/ |
|
if (unlikely(ehdr->h_proto == rx->sdata->control_port_protocol)) |
|
return ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) || |
|
ether_addr_equal(ehdr->h_dest, pae_group_addr); |
|
|
|
if (ieee80211_802_1x_port_control(rx) || |
|
ieee80211_drop_unencrypted(rx, fc)) |
|
return false; |
|
|
|
return true; |
|
} |
|
|
|
static void ieee80211_deliver_skb_to_local_stack(struct sk_buff *skb, |
|
struct ieee80211_rx_data *rx) |
|
{ |
|
struct ieee80211_sub_if_data *sdata = rx->sdata; |
|
struct net_device *dev = sdata->dev; |
|
|
|
if (unlikely((skb->protocol == sdata->control_port_protocol || |
|
(skb->protocol == cpu_to_be16(ETH_P_PREAUTH) && |
|
!sdata->control_port_no_preauth)) && |
|
sdata->control_port_over_nl80211)) { |
|
struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
|
bool noencrypt = !(status->flag & RX_FLAG_DECRYPTED); |
|
|
|
cfg80211_rx_control_port(dev, skb, noencrypt); |
|
dev_kfree_skb(skb); |
|
} else { |
|
struct ethhdr *ehdr = (void *)skb_mac_header(skb); |
|
|
|
memset(skb->cb, 0, sizeof(skb->cb)); |
|
|
|
/* |
|
* 802.1X over 802.11 requires that the authenticator address |
|
* be used for EAPOL frames. However, 802.1X allows the use of |
|
* the PAE group address instead. If the interface is part of |
|
* a bridge and we pass the frame with the PAE group address, |
|
* then the bridge will forward it to the network (even if the |
|
* client was not associated yet), which isn't supposed to |
|
* happen. |
|
* To avoid that, rewrite the destination address to our own |
|
* address, so that the authenticator (e.g. hostapd) will see |
|
* the frame, but bridge won't forward it anywhere else. Note |
|
* that due to earlier filtering, the only other address can |
|
* be the PAE group address. |
|
*/ |
|
if (unlikely(skb->protocol == sdata->control_port_protocol && |
|
!ether_addr_equal(ehdr->h_dest, sdata->vif.addr))) |
|
ether_addr_copy(ehdr->h_dest, sdata->vif.addr); |
|
|
|
/* deliver to local stack */ |
|
if (rx->list) |
|
list_add_tail(&skb->list, rx->list); |
|
else |
|
netif_receive_skb(skb); |
|
} |
|
} |
|
|
|
/* |
|
* requires that rx->skb is a frame with ethernet header |
|
*/ |
|
static void |
|
ieee80211_deliver_skb(struct ieee80211_rx_data *rx) |
|
{ |
|
struct ieee80211_sub_if_data *sdata = rx->sdata; |
|
struct net_device *dev = sdata->dev; |
|
struct sk_buff *skb, *xmit_skb; |
|
struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data; |
|
struct sta_info *dsta; |
|
|
|
skb = rx->skb; |
|
xmit_skb = NULL; |
|
|
|
dev_sw_netstats_rx_add(dev, skb->len); |
|
|
|
if (rx->sta) { |
|
/* The seqno index has the same property as needed |
|
* for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS |
|
* for non-QoS-data frames. Here we know it's a data |
|
* frame, so count MSDUs. |
|
*/ |
|
u64_stats_update_begin(&rx->sta->rx_stats.syncp); |
|
rx->sta->rx_stats.msdu[rx->seqno_idx]++; |
|
u64_stats_update_end(&rx->sta->rx_stats.syncp); |
|
} |
|
|
|
if ((sdata->vif.type == NL80211_IFTYPE_AP || |
|
sdata->vif.type == NL80211_IFTYPE_AP_VLAN) && |
|
!(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) && |
|
ehdr->h_proto != rx->sdata->control_port_protocol && |
|
(sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) { |
|
if (is_multicast_ether_addr(ehdr->h_dest) && |
|
ieee80211_vif_get_num_mcast_if(sdata) != 0) { |
|
/* |
|
* send multicast frames both to higher layers in |
|
* local net stack and back to the wireless medium |
|
*/ |
|
xmit_skb = skb_copy(skb, GFP_ATOMIC); |
|
if (!xmit_skb) |
|
net_info_ratelimited("%s: failed to clone multicast frame\n", |
|
dev->name); |
|
} else if (!is_multicast_ether_addr(ehdr->h_dest) && |
|
!ether_addr_equal(ehdr->h_dest, ehdr->h_source)) { |
|
dsta = sta_info_get(sdata, ehdr->h_dest); |
|
if (dsta) { |
|
/* |
|
* The destination station is associated to |
|
* this AP (in this VLAN), so send the frame |
|
* directly to it and do not pass it to local |
|
* net stack. |
|
*/ |
|
xmit_skb = skb; |
|
skb = NULL; |
|
} |
|
} |
|
} |
|
|
|
#ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS |
|
if (skb) { |
|
/* 'align' will only take the values 0 or 2 here since all |
|
* frames are required to be aligned to 2-byte boundaries |
|
* when being passed to mac80211; the code here works just |
|
* as well if that isn't true, but mac80211 assumes it can |
|
* access fields as 2-byte aligned (e.g. for ether_addr_equal) |
|
*/ |
|
int align; |
|
|
|
align = (unsigned long)(skb->data + sizeof(struct ethhdr)) & 3; |
|
if (align) { |
|
if (WARN_ON(skb_headroom(skb) < 3)) { |
|
dev_kfree_skb(skb); |
|
skb = NULL; |
|
} else { |
|
u8 *data = skb->data; |
|
size_t len = skb_headlen(skb); |
|
skb->data -= align; |
|
memmove(skb->data, data, len); |
|
skb_set_tail_pointer(skb, len); |
|
} |
|
} |
|
} |
|
#endif |
|
|
|
if (skb) { |
|
skb->protocol = eth_type_trans(skb, dev); |
|
ieee80211_deliver_skb_to_local_stack(skb, rx); |
|
} |
|
|
|
if (xmit_skb) { |
|
/* |
|
* Send to wireless media and increase priority by 256 to |
|
* keep the received priority instead of reclassifying |
|
* the frame (see cfg80211_classify8021d). |
|
*/ |
|
xmit_skb->priority += 256; |
|
xmit_skb->protocol = htons(ETH_P_802_3); |
|
skb_reset_network_header(xmit_skb); |
|
skb_reset_mac_header(xmit_skb); |
|
dev_queue_xmit(xmit_skb); |
|
} |
|
} |
|
|
|
static ieee80211_rx_result debug_noinline |
|
__ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx, u8 data_offset) |
|
{ |
|
struct net_device *dev = rx->sdata->dev; |
|
struct sk_buff *skb = rx->skb; |
|
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; |
|
__le16 fc = hdr->frame_control; |
|
struct sk_buff_head frame_list; |
|
struct ethhdr ethhdr; |
|
const u8 *check_da = ethhdr.h_dest, *check_sa = ethhdr.h_source; |
|
|
|
if (unlikely(ieee80211_has_a4(hdr->frame_control))) { |
|
check_da = NULL; |
|
check_sa = NULL; |
|
} else switch (rx->sdata->vif.type) { |
|
case NL80211_IFTYPE_AP: |
|
case NL80211_IFTYPE_AP_VLAN: |
|
check_da = NULL; |
|
break; |
|
case NL80211_IFTYPE_STATION: |
|
if (!rx->sta || |
|
!test_sta_flag(rx->sta, WLAN_STA_TDLS_PEER)) |
|
check_sa = NULL; |
|
break; |
|
case NL80211_IFTYPE_MESH_POINT: |
|
check_sa = NULL; |
|
break; |
|
default: |
|
break; |
|
} |
|
|
|
skb->dev = dev; |
|
__skb_queue_head_init(&frame_list); |
|
|
|
if (ieee80211_data_to_8023_exthdr(skb, ðhdr, |
|
rx->sdata->vif.addr, |
|
rx->sdata->vif.type, |
|
data_offset, true)) |
|
return RX_DROP_UNUSABLE; |
|
|
|
ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr, |
|
rx->sdata->vif.type, |
|
rx->local->hw.extra_tx_headroom, |
|
check_da, check_sa); |
|
|
|
while (!skb_queue_empty(&frame_list)) { |
|
rx->skb = __skb_dequeue(&frame_list); |
|
|
|
if (!ieee80211_frame_allowed(rx, fc)) { |
|
dev_kfree_skb(rx->skb); |
|
continue; |
|
} |
|
|
|
ieee80211_deliver_skb(rx); |
|
} |
|
|
|
return RX_QUEUED; |
|
} |
|
|
|
static ieee80211_rx_result debug_noinline |
|
ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx) |
|
{ |
|
struct sk_buff *skb = rx->skb; |
|
struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
|
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; |
|
__le16 fc = hdr->frame_control; |
|
|
|
if (!(status->rx_flags & IEEE80211_RX_AMSDU)) |
|
return RX_CONTINUE; |
|
|
|
if (unlikely(!ieee80211_is_data(fc))) |
|
return RX_CONTINUE; |
|
|
|
if (unlikely(!ieee80211_is_data_present(fc))) |
|
return RX_DROP_MONITOR; |
|
|
|
if (unlikely(ieee80211_has_a4(hdr->frame_control))) { |
|
switch (rx->sdata->vif.type) { |
|
case NL80211_IFTYPE_AP_VLAN: |
|
if (!rx->sdata->u.vlan.sta) |
|
return RX_DROP_UNUSABLE; |
|
break; |
|
case NL80211_IFTYPE_STATION: |
|
if (!rx->sdata->u.mgd.use_4addr) |
|
return RX_DROP_UNUSABLE; |
|
break; |
|
default: |
|
return RX_DROP_UNUSABLE; |
|
} |
|
} |
|
|
|
if (is_multicast_ether_addr(hdr->addr1)) |
|
return RX_DROP_UNUSABLE; |
|
|
|
if (rx->key) { |
|
/* |
|
* We should not receive A-MSDUs on pre-HT connections, |
|
* and HT connections cannot use old ciphers. Thus drop |
|
* them, as in those cases we couldn't even have SPP |
|
* A-MSDUs or such. |
|
*/ |
|
switch (rx->key->conf.cipher) { |
|
case WLAN_CIPHER_SUITE_WEP40: |
|
case WLAN_CIPHER_SUITE_WEP104: |
|
case WLAN_CIPHER_SUITE_TKIP: |
|
return RX_DROP_UNUSABLE; |
|
default: |
|
break; |
|
} |
|
} |
|
|
|
return __ieee80211_rx_h_amsdu(rx, 0); |
|
} |
|
|
|
#ifdef CONFIG_MAC80211_MESH |
|
static ieee80211_rx_result |
|
ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx) |
|
{ |
|
struct ieee80211_hdr *fwd_hdr, *hdr; |
|
struct ieee80211_tx_info *info; |
|
struct ieee80211s_hdr *mesh_hdr; |
|
struct sk_buff *skb = rx->skb, *fwd_skb; |
|
struct ieee80211_local *local = rx->local; |
|
struct ieee80211_sub_if_data *sdata = rx->sdata; |
|
struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
|
u16 ac, q, hdrlen; |
|
int tailroom = 0; |
|
|
|
hdr = (struct ieee80211_hdr *) skb->data; |
|
hdrlen = ieee80211_hdrlen(hdr->frame_control); |
|
|
|
/* make sure fixed part of mesh header is there, also checks skb len */ |
|
if (!pskb_may_pull(rx->skb, hdrlen + 6)) |
|
return RX_DROP_MONITOR; |
|
|
|
mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen); |
|
|
|
/* make sure full mesh header is there, also checks skb len */ |
|
if (!pskb_may_pull(rx->skb, |
|
hdrlen + ieee80211_get_mesh_hdrlen(mesh_hdr))) |
|
return RX_DROP_MONITOR; |
|
|
|
/* reload pointers */ |
|
hdr = (struct ieee80211_hdr *) skb->data; |
|
mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen); |
|
|
|
if (ieee80211_drop_unencrypted(rx, hdr->frame_control)) |
|
return RX_DROP_MONITOR; |
|
|
|
/* frame is in RMC, don't forward */ |
|
if (ieee80211_is_data(hdr->frame_control) && |
|
is_multicast_ether_addr(hdr->addr1) && |
|
mesh_rmc_check(rx->sdata, hdr->addr3, mesh_hdr)) |
|
return RX_DROP_MONITOR; |
|
|
|
if (!ieee80211_is_data(hdr->frame_control)) |
|
return RX_CONTINUE; |
|
|
|
if (!mesh_hdr->ttl) |
|
return RX_DROP_MONITOR; |
|
|
|
if (mesh_hdr->flags & MESH_FLAGS_AE) { |
|
struct mesh_path *mppath; |
|
char *proxied_addr; |
|
char *mpp_addr; |
|
|
|
if (is_multicast_ether_addr(hdr->addr1)) { |
|
mpp_addr = hdr->addr3; |
|
proxied_addr = mesh_hdr->eaddr1; |
|
} else if ((mesh_hdr->flags & MESH_FLAGS_AE) == |
|
MESH_FLAGS_AE_A5_A6) { |
|
/* has_a4 already checked in ieee80211_rx_mesh_check */ |
|
mpp_addr = hdr->addr4; |
|
proxied_addr = mesh_hdr->eaddr2; |
|
} else { |
|
return RX_DROP_MONITOR; |
|
} |
|
|
|
rcu_read_lock(); |
|
mppath = mpp_path_lookup(sdata, proxied_addr); |
|
if (!mppath) { |
|
mpp_path_add(sdata, proxied_addr, mpp_addr); |
|
} else { |
|
spin_lock_bh(&mppath->state_lock); |
|
if (!ether_addr_equal(mppath->mpp, mpp_addr)) |
|
memcpy(mppath->mpp, mpp_addr, ETH_ALEN); |
|
mppath->exp_time = jiffies; |
|
spin_unlock_bh(&mppath->state_lock); |
|
} |
|
rcu_read_unlock(); |
|
} |
|
|
|
/* Frame has reached destination. Don't forward */ |
|
if (!is_multicast_ether_addr(hdr->addr1) && |
|
ether_addr_equal(sdata->vif.addr, hdr->addr3)) |
|
return RX_CONTINUE; |
|
|
|
ac = ieee80211_select_queue_80211(sdata, skb, hdr); |
|
q = sdata->vif.hw_queue[ac]; |
|
if (ieee80211_queue_stopped(&local->hw, q)) { |
|
IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_congestion); |
|
return RX_DROP_MONITOR; |
|
} |
|
skb_set_queue_mapping(skb, q); |
|
|
|
if (!--mesh_hdr->ttl) { |
|
if (!is_multicast_ether_addr(hdr->addr1)) |
|
IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, |
|
dropped_frames_ttl); |
|
goto out; |
|
} |
|
|
|
if (!ifmsh->mshcfg.dot11MeshForwarding) |
|
goto out; |
|
|
|
if (sdata->crypto_tx_tailroom_needed_cnt) |
|
tailroom = IEEE80211_ENCRYPT_TAILROOM; |
|
|
|
fwd_skb = skb_copy_expand(skb, local->tx_headroom + |
|
sdata->encrypt_headroom, |
|
tailroom, GFP_ATOMIC); |
|
if (!fwd_skb) |
|
goto out; |
|
|
|
fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data; |
|
fwd_hdr->frame_control &= ~cpu_to_le16(IEEE80211_FCTL_RETRY); |
|
info = IEEE80211_SKB_CB(fwd_skb); |
|
memset(info, 0, sizeof(*info)); |
|
info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING; |
|
info->control.vif = &rx->sdata->vif; |
|
info->control.jiffies = jiffies; |
|
if (is_multicast_ether_addr(fwd_hdr->addr1)) { |
|
IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_mcast); |
|
memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN); |
|
/* update power mode indication when forwarding */ |
|
ieee80211_mps_set_frame_flags(sdata, NULL, fwd_hdr); |
|
} else if (!mesh_nexthop_lookup(sdata, fwd_skb)) { |
|
/* mesh power mode flags updated in mesh_nexthop_lookup */ |
|
IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_unicast); |
|
} else { |
|
/* unable to resolve next hop */ |
|
mesh_path_error_tx(sdata, ifmsh->mshcfg.element_ttl, |
|
fwd_hdr->addr3, 0, |
|
WLAN_REASON_MESH_PATH_NOFORWARD, |
|
fwd_hdr->addr2); |
|
IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_no_route); |
|
kfree_skb(fwd_skb); |
|
return RX_DROP_MONITOR; |
|
} |
|
|
|
IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, fwded_frames); |
|
ieee80211_add_pending_skb(local, fwd_skb); |
|
out: |
|
if (is_multicast_ether_addr(hdr->addr1)) |
|
return RX_CONTINUE; |
|
return RX_DROP_MONITOR; |
|
} |
|
#endif |
|
|
|
static ieee80211_rx_result debug_noinline |
|
ieee80211_rx_h_data(struct ieee80211_rx_data *rx) |
|
{ |
|
struct ieee80211_sub_if_data *sdata = rx->sdata; |
|
struct ieee80211_local *local = rx->local; |
|
struct net_device *dev = sdata->dev; |
|
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
|
__le16 fc = hdr->frame_control; |
|
bool port_control; |
|
int err; |
|
|
|
if (unlikely(!ieee80211_is_data(hdr->frame_control))) |
|
return RX_CONTINUE; |
|
|
|
if (unlikely(!ieee80211_is_data_present(hdr->frame_control))) |
|
return RX_DROP_MONITOR; |
|
|
|
/* |
|
* Send unexpected-4addr-frame event to hostapd. For older versions, |
|
* also drop the frame to cooked monitor interfaces. |
|
*/ |
|
if (ieee80211_has_a4(hdr->frame_control) && |
|
sdata->vif.type == NL80211_IFTYPE_AP) { |
|
if (rx->sta && |
|
!test_and_set_sta_flag(rx->sta, WLAN_STA_4ADDR_EVENT)) |
|
cfg80211_rx_unexpected_4addr_frame( |
|
rx->sdata->dev, rx->sta->sta.addr, GFP_ATOMIC); |
|
return RX_DROP_MONITOR; |
|
} |
|
|
|
err = __ieee80211_data_to_8023(rx, &port_control); |
|
if (unlikely(err)) |
|
return RX_DROP_UNUSABLE; |
|
|
|
if (!ieee80211_frame_allowed(rx, fc)) |
|
return RX_DROP_MONITOR; |
|
|
|
/* directly handle TDLS channel switch requests/responses */ |
|
if (unlikely(((struct ethhdr *)rx->skb->data)->h_proto == |
|
cpu_to_be16(ETH_P_TDLS))) { |
|
struct ieee80211_tdls_data *tf = (void *)rx->skb->data; |
|
|
|
if (pskb_may_pull(rx->skb, |
|
offsetof(struct ieee80211_tdls_data, u)) && |
|
tf->payload_type == WLAN_TDLS_SNAP_RFTYPE && |
|
tf->category == WLAN_CATEGORY_TDLS && |
|
(tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_REQUEST || |
|
tf->action_code == WLAN_TDLS_CHANNEL_SWITCH_RESPONSE)) { |
|
skb_queue_tail(&local->skb_queue_tdls_chsw, rx->skb); |
|
schedule_work(&local->tdls_chsw_work); |
|
if (rx->sta) |
|
rx->sta->rx_stats.packets++; |
|
|
|
return RX_QUEUED; |
|
} |
|
} |
|
|
|
if (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN && |
|
unlikely(port_control) && sdata->bss) { |
|
sdata = container_of(sdata->bss, struct ieee80211_sub_if_data, |
|
u.ap); |
|
dev = sdata->dev; |
|
rx->sdata = sdata; |
|
} |
|
|
|
rx->skb->dev = dev; |
|
|
|
if (!ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) && |
|
local->ps_sdata && local->hw.conf.dynamic_ps_timeout > 0 && |
|
!is_multicast_ether_addr( |
|
((struct ethhdr *)rx->skb->data)->h_dest) && |
|
(!local->scanning && |
|
!test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))) |
|
mod_timer(&local->dynamic_ps_timer, jiffies + |
|
msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout)); |
|
|
|
ieee80211_deliver_skb(rx); |
|
|
|
return RX_QUEUED; |
|
} |
|
|
|
static ieee80211_rx_result debug_noinline |
|
ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames) |
|
{ |
|
struct sk_buff *skb = rx->skb; |
|
struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data; |
|
struct tid_ampdu_rx *tid_agg_rx; |
|
u16 start_seq_num; |
|
u16 tid; |
|
|
|
if (likely(!ieee80211_is_ctl(bar->frame_control))) |
|
return RX_CONTINUE; |
|
|
|
if (ieee80211_is_back_req(bar->frame_control)) { |
|
struct { |
|
__le16 control, start_seq_num; |
|
} __packed bar_data; |
|
struct ieee80211_event event = { |
|
.type = BAR_RX_EVENT, |
|
}; |
|
|
|
if (!rx->sta) |
|
return RX_DROP_MONITOR; |
|
|
|
if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control), |
|
&bar_data, sizeof(bar_data))) |
|
return RX_DROP_MONITOR; |
|
|
|
tid = le16_to_cpu(bar_data.control) >> 12; |
|
|
|
if (!test_bit(tid, rx->sta->ampdu_mlme.agg_session_valid) && |
|
!test_and_set_bit(tid, rx->sta->ampdu_mlme.unexpected_agg)) |
|
ieee80211_send_delba(rx->sdata, rx->sta->sta.addr, tid, |
|
WLAN_BACK_RECIPIENT, |
|
WLAN_REASON_QSTA_REQUIRE_SETUP); |
|
|
|
tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]); |
|
if (!tid_agg_rx) |
|
return RX_DROP_MONITOR; |
|
|
|
start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4; |
|
event.u.ba.tid = tid; |
|
event.u.ba.ssn = start_seq_num; |
|
event.u.ba.sta = &rx->sta->sta; |
|
|
|
/* reset session timer */ |
|
if (tid_agg_rx->timeout) |
|
mod_timer(&tid_agg_rx->session_timer, |
|
TU_TO_EXP_TIME(tid_agg_rx->timeout)); |
|
|
|
spin_lock(&tid_agg_rx->reorder_lock); |
|
/* release stored frames up to start of BAR */ |
|
ieee80211_release_reorder_frames(rx->sdata, tid_agg_rx, |
|
start_seq_num, frames); |
|
spin_unlock(&tid_agg_rx->reorder_lock); |
|
|
|
drv_event_callback(rx->local, rx->sdata, &event); |
|
|
|
kfree_skb(skb); |
|
return RX_QUEUED; |
|
} |
|
|
|
/* |
|
* After this point, we only want management frames, |
|
* so we can drop all remaining control frames to |
|
* cooked monitor interfaces. |
|
*/ |
|
return RX_DROP_MONITOR; |
|
} |
|
|
|
static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata, |
|
struct ieee80211_mgmt *mgmt, |
|
size_t len) |
|
{ |
|
struct ieee80211_local *local = sdata->local; |
|
struct sk_buff *skb; |
|
struct ieee80211_mgmt *resp; |
|
|
|
if (!ether_addr_equal(mgmt->da, sdata->vif.addr)) { |
|
/* Not to own unicast address */ |
|
return; |
|
} |
|
|
|
if (!ether_addr_equal(mgmt->sa, sdata->u.mgd.bssid) || |
|
!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) { |
|
/* Not from the current AP or not associated yet. */ |
|
return; |
|
} |
|
|
|
if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) { |
|
/* Too short SA Query request frame */ |
|
return; |
|
} |
|
|
|
skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom); |
|
if (skb == NULL) |
|
return; |
|
|
|
skb_reserve(skb, local->hw.extra_tx_headroom); |
|
resp = skb_put_zero(skb, 24); |
|
memcpy(resp->da, mgmt->sa, ETH_ALEN); |
|
memcpy(resp->sa, sdata->vif.addr, ETH_ALEN); |
|
memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN); |
|
resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
|
IEEE80211_STYPE_ACTION); |
|
skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query)); |
|
resp->u.action.category = WLAN_CATEGORY_SA_QUERY; |
|
resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE; |
|
memcpy(resp->u.action.u.sa_query.trans_id, |
|
mgmt->u.action.u.sa_query.trans_id, |
|
WLAN_SA_QUERY_TR_ID_LEN); |
|
|
|
ieee80211_tx_skb(sdata, skb); |
|
} |
|
|
|
static ieee80211_rx_result debug_noinline |
|
ieee80211_rx_h_mgmt_check(struct ieee80211_rx_data *rx) |
|
{ |
|
struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; |
|
struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); |
|
|
|
if (ieee80211_is_s1g_beacon(mgmt->frame_control)) |
|
return RX_CONTINUE; |
|
|
|
/* |
|
* From here on, look only at management frames. |
|
* Data and control frames are already handled, |
|
* and unknown (reserved) frames are useless. |
|
*/ |
|
if (rx->skb->len < 24) |
|
return RX_DROP_MONITOR; |
|
|
|
if (!ieee80211_is_mgmt(mgmt->frame_control)) |
|
return RX_DROP_MONITOR; |
|
|
|
if (rx->sdata->vif.type == NL80211_IFTYPE_AP && |
|
ieee80211_is_beacon(mgmt->frame_control) && |
|
!(rx->flags & IEEE80211_RX_BEACON_REPORTED)) { |
|
int sig = 0; |
|
|
|
if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM) && |
|
!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) |
|
sig = status->signal; |
|
|
|
cfg80211_report_obss_beacon_khz(rx->local->hw.wiphy, |
|
rx->skb->data, rx->skb->len, |
|
ieee80211_rx_status_to_khz(status), |
|
sig); |
|
rx->flags |= IEEE80211_RX_BEACON_REPORTED; |
|
} |
|
|
|
if (ieee80211_drop_unencrypted_mgmt(rx)) |
|
return RX_DROP_UNUSABLE; |
|
|
|
return RX_CONTINUE; |
|
} |
|
|
|
static ieee80211_rx_result debug_noinline |
|
ieee80211_rx_h_action(struct ieee80211_rx_data *rx) |
|
{ |
|
struct ieee80211_local *local = rx->local; |
|
struct ieee80211_sub_if_data *sdata = rx->sdata; |
|
struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; |
|
struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); |
|
int len = rx->skb->len; |
|
|
|
if (!ieee80211_is_action(mgmt->frame_control)) |
|
return RX_CONTINUE; |
|
|
|
/* drop too small frames */ |
|
if (len < IEEE80211_MIN_ACTION_SIZE) |
|
return RX_DROP_UNUSABLE; |
|
|
|
if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC && |
|
mgmt->u.action.category != WLAN_CATEGORY_SELF_PROTECTED && |
|
mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT) |
|
return RX_DROP_UNUSABLE; |
|
|
|
switch (mgmt->u.action.category) { |
|
case WLAN_CATEGORY_HT: |
|
/* reject HT action frames from stations not supporting HT */ |
|
if (!rx->sta->sta.ht_cap.ht_supported) |
|
goto invalid; |
|
|
|
if (sdata->vif.type != NL80211_IFTYPE_STATION && |
|
sdata->vif.type != NL80211_IFTYPE_MESH_POINT && |
|
sdata->vif.type != NL80211_IFTYPE_AP_VLAN && |
|
sdata->vif.type != NL80211_IFTYPE_AP && |
|
sdata->vif.type != NL80211_IFTYPE_ADHOC) |
|
break; |
|
|
|
/* verify action & smps_control/chanwidth are present */ |
|
if (len < IEEE80211_MIN_ACTION_SIZE + 2) |
|
goto invalid; |
|
|
|
switch (mgmt->u.action.u.ht_smps.action) { |
|
case WLAN_HT_ACTION_SMPS: { |
|
struct ieee80211_supported_band *sband; |
|
enum ieee80211_smps_mode smps_mode; |
|
struct sta_opmode_info sta_opmode = {}; |
|
|
|
if (sdata->vif.type != NL80211_IFTYPE_AP && |
|
sdata->vif.type != NL80211_IFTYPE_AP_VLAN) |
|
goto handled; |
|
|
|
/* convert to HT capability */ |
|
switch (mgmt->u.action.u.ht_smps.smps_control) { |
|
case WLAN_HT_SMPS_CONTROL_DISABLED: |
|
smps_mode = IEEE80211_SMPS_OFF; |
|
break; |
|
case WLAN_HT_SMPS_CONTROL_STATIC: |
|
smps_mode = IEEE80211_SMPS_STATIC; |
|
break; |
|
case WLAN_HT_SMPS_CONTROL_DYNAMIC: |
|
smps_mode = IEEE80211_SMPS_DYNAMIC; |
|
break; |
|
default: |
|
goto invalid; |
|
} |
|
|
|
/* if no change do nothing */ |
|
if (rx->sta->sta.smps_mode == smps_mode) |
|
goto handled; |
|
rx->sta->sta.smps_mode = smps_mode; |
|
sta_opmode.smps_mode = |
|
ieee80211_smps_mode_to_smps_mode(smps_mode); |
|
sta_opmode.changed = STA_OPMODE_SMPS_MODE_CHANGED; |
|
|
|
sband = rx->local->hw.wiphy->bands[status->band]; |
|
|
|
rate_control_rate_update(local, sband, rx->sta, |
|
IEEE80211_RC_SMPS_CHANGED); |
|
cfg80211_sta_opmode_change_notify(sdata->dev, |
|
rx->sta->addr, |
|
&sta_opmode, |
|
GFP_ATOMIC); |
|
goto handled; |
|
} |
|
case WLAN_HT_ACTION_NOTIFY_CHANWIDTH: { |
|
struct ieee80211_supported_band *sband; |
|
u8 chanwidth = mgmt->u.action.u.ht_notify_cw.chanwidth; |
|
enum ieee80211_sta_rx_bandwidth max_bw, new_bw; |
|
struct sta_opmode_info sta_opmode = {}; |
|
|
|
/* If it doesn't support 40 MHz it can't change ... */ |
|
if (!(rx->sta->sta.ht_cap.cap & |
|
IEEE80211_HT_CAP_SUP_WIDTH_20_40)) |
|
goto handled; |
|
|
|
if (chanwidth == IEEE80211_HT_CHANWIDTH_20MHZ) |
|
max_bw = IEEE80211_STA_RX_BW_20; |
|
else |
|
max_bw = ieee80211_sta_cap_rx_bw(rx->sta); |
|
|
|
/* set cur_max_bandwidth and recalc sta bw */ |
|
rx->sta->cur_max_bandwidth = max_bw; |
|
new_bw = ieee80211_sta_cur_vht_bw(rx->sta); |
|
|
|
if (rx->sta->sta.bandwidth == new_bw) |
|
goto handled; |
|
|
|
rx->sta->sta.bandwidth = new_bw; |
|
sband = rx->local->hw.wiphy->bands[status->band]; |
|
sta_opmode.bw = |
|
ieee80211_sta_rx_bw_to_chan_width(rx->sta); |
|
sta_opmode.changed = STA_OPMODE_MAX_BW_CHANGED; |
|
|
|
rate_control_rate_update(local, sband, rx->sta, |
|
IEEE80211_RC_BW_CHANGED); |
|
cfg80211_sta_opmode_change_notify(sdata->dev, |
|
rx->sta->addr, |
|
&sta_opmode, |
|
GFP_ATOMIC); |
|
goto handled; |
|
} |
|
default: |
|
goto invalid; |
|
} |
|
|
|
break; |
|
case WLAN_CATEGORY_PUBLIC: |
|
if (len < IEEE80211_MIN_ACTION_SIZE + 1) |
|
goto invalid; |
|
if (sdata->vif.type != NL80211_IFTYPE_STATION) |
|
break; |
|
if (!rx->sta) |
|
break; |
|
if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) |
|
break; |
|
if (mgmt->u.action.u.ext_chan_switch.action_code != |
|
WLAN_PUB_ACTION_EXT_CHANSW_ANN) |
|
break; |
|
if (len < offsetof(struct ieee80211_mgmt, |
|
u.action.u.ext_chan_switch.variable)) |
|
goto invalid; |
|
goto queue; |
|
case WLAN_CATEGORY_VHT: |
|
if (sdata->vif.type != NL80211_IFTYPE_STATION && |
|
sdata->vif.type != NL80211_IFTYPE_MESH_POINT && |
|
sdata->vif.type != NL80211_IFTYPE_AP_VLAN && |
|
sdata->vif.type != NL80211_IFTYPE_AP && |
|
sdata->vif.type != NL80211_IFTYPE_ADHOC) |
|
break; |
|
|
|
/* verify action code is present */ |
|
if (len < IEEE80211_MIN_ACTION_SIZE + 1) |
|
goto invalid; |
|
|
|
switch (mgmt->u.action.u.vht_opmode_notif.action_code) { |
|
case WLAN_VHT_ACTION_OPMODE_NOTIF: { |
|
/* verify opmode is present */ |
|
if (len < IEEE80211_MIN_ACTION_SIZE + 2) |
|
goto invalid; |
|
goto queue; |
|
} |
|
case WLAN_VHT_ACTION_GROUPID_MGMT: { |
|
if (len < IEEE80211_MIN_ACTION_SIZE + 25) |
|
goto invalid; |
|
goto queue; |
|
} |
|
default: |
|
break; |
|
} |
|
break; |
|
case WLAN_CATEGORY_BACK: |
|
if (sdata->vif.type != NL80211_IFTYPE_STATION && |
|
sdata->vif.type != NL80211_IFTYPE_MESH_POINT && |
|
sdata->vif.type != NL80211_IFTYPE_AP_VLAN && |
|
sdata->vif.type != NL80211_IFTYPE_AP && |
|
sdata->vif.type != NL80211_IFTYPE_ADHOC) |
|
break; |
|
|
|
/* verify action_code is present */ |
|
if (len < IEEE80211_MIN_ACTION_SIZE + 1) |
|
break; |
|
|
|
switch (mgmt->u.action.u.addba_req.action_code) { |
|
case WLAN_ACTION_ADDBA_REQ: |
|
if (len < (IEEE80211_MIN_ACTION_SIZE + |
|
sizeof(mgmt->u.action.u.addba_req))) |
|
goto invalid; |
|
break; |
|
case WLAN_ACTION_ADDBA_RESP: |
|
if (len < (IEEE80211_MIN_ACTION_SIZE + |
|
sizeof(mgmt->u.action.u.addba_resp))) |
|
goto invalid; |
|
break; |
|
case WLAN_ACTION_DELBA: |
|
if (len < (IEEE80211_MIN_ACTION_SIZE + |
|
sizeof(mgmt->u.action.u.delba))) |
|
goto invalid; |
|
break; |
|
default: |
|
goto invalid; |
|
} |
|
|
|
goto queue; |
|
case WLAN_CATEGORY_SPECTRUM_MGMT: |
|
/* verify action_code is present */ |
|
if (len < IEEE80211_MIN_ACTION_SIZE + 1) |
|
break; |
|
|
|
switch (mgmt->u.action.u.measurement.action_code) { |
|
case WLAN_ACTION_SPCT_MSR_REQ: |
|
if (status->band != NL80211_BAND_5GHZ) |
|
break; |
|
|
|
if (len < (IEEE80211_MIN_ACTION_SIZE + |
|
sizeof(mgmt->u.action.u.measurement))) |
|
break; |
|
|
|
if (sdata->vif.type != NL80211_IFTYPE_STATION) |
|
break; |
|
|
|
ieee80211_process_measurement_req(sdata, mgmt, len); |
|
goto handled; |
|
case WLAN_ACTION_SPCT_CHL_SWITCH: { |
|
u8 *bssid; |
|
if (len < (IEEE80211_MIN_ACTION_SIZE + |
|
sizeof(mgmt->u.action.u.chan_switch))) |
|
break; |
|
|
|
if (sdata->vif.type != NL80211_IFTYPE_STATION && |
|
sdata->vif.type != NL80211_IFTYPE_ADHOC && |
|
sdata->vif.type != NL80211_IFTYPE_MESH_POINT) |
|
break; |
|
|
|
if (sdata->vif.type == NL80211_IFTYPE_STATION) |
|
bssid = sdata->u.mgd.bssid; |
|
else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) |
|
bssid = sdata->u.ibss.bssid; |
|
else if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT) |
|
bssid = mgmt->sa; |
|
else |
|
break; |
|
|
|
if (!ether_addr_equal(mgmt->bssid, bssid)) |
|
break; |
|
|
|
goto queue; |
|
} |
|
} |
|
break; |
|
case WLAN_CATEGORY_SELF_PROTECTED: |
|
if (len < (IEEE80211_MIN_ACTION_SIZE + |
|
sizeof(mgmt->u.action.u.self_prot.action_code))) |
|
break; |
|
|
|
switch (mgmt->u.action.u.self_prot.action_code) { |
|
case WLAN_SP_MESH_PEERING_OPEN: |
|
case WLAN_SP_MESH_PEERING_CLOSE: |
|
case WLAN_SP_MESH_PEERING_CONFIRM: |
|
if (!ieee80211_vif_is_mesh(&sdata->vif)) |
|
goto invalid; |
|
if (sdata->u.mesh.user_mpm) |
|
/* userspace handles this frame */ |
|
break; |
|
goto queue; |
|
case WLAN_SP_MGK_INFORM: |
|
case WLAN_SP_MGK_ACK: |
|
if (!ieee80211_vif_is_mesh(&sdata->vif)) |
|
goto invalid; |
|
break; |
|
} |
|
break; |
|
case WLAN_CATEGORY_MESH_ACTION: |
|
if (len < (IEEE80211_MIN_ACTION_SIZE + |
|
sizeof(mgmt->u.action.u.mesh_action.action_code))) |
|
break; |
|
|
|
if (!ieee80211_vif_is_mesh(&sdata->vif)) |
|
break; |
|
if (mesh_action_is_path_sel(mgmt) && |
|
!mesh_path_sel_is_hwmp(sdata)) |
|
break; |
|
goto queue; |
|
} |
|
|
|
return RX_CONTINUE; |
|
|
|
invalid: |
|
status->rx_flags |= IEEE80211_RX_MALFORMED_ACTION_FRM; |
|
/* will return in the next handlers */ |
|
return RX_CONTINUE; |
|
|
|
handled: |
|
if (rx->sta) |
|
rx->sta->rx_stats.packets++; |
|
dev_kfree_skb(rx->skb); |
|
return RX_QUEUED; |
|
|
|
queue: |
|
skb_queue_tail(&sdata->skb_queue, rx->skb); |
|
ieee80211_queue_work(&local->hw, &sdata->work); |
|
if (rx->sta) |
|
rx->sta->rx_stats.packets++; |
|
return RX_QUEUED; |
|
} |
|
|
|
static ieee80211_rx_result debug_noinline |
|
ieee80211_rx_h_userspace_mgmt(struct ieee80211_rx_data *rx) |
|
{ |
|
struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); |
|
int sig = 0; |
|
|
|
/* skip known-bad action frames and return them in the next handler */ |
|
if (status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) |
|
return RX_CONTINUE; |
|
|
|
/* |
|
* Getting here means the kernel doesn't know how to handle |
|
* it, but maybe userspace does ... include returned frames |
|
* so userspace can register for those to know whether ones |
|
* it transmitted were processed or returned. |
|
*/ |
|
|
|
if (ieee80211_hw_check(&rx->local->hw, SIGNAL_DBM) && |
|
!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) |
|
sig = status->signal; |
|
|
|
if (cfg80211_rx_mgmt_khz(&rx->sdata->wdev, |
|
ieee80211_rx_status_to_khz(status), sig, |
|
rx->skb->data, rx->skb->len, 0)) { |
|
if (rx->sta) |
|
rx->sta->rx_stats.packets++; |
|
dev_kfree_skb(rx->skb); |
|
return RX_QUEUED; |
|
} |
|
|
|
return RX_CONTINUE; |
|
} |
|
|
|
static ieee80211_rx_result debug_noinline |
|
ieee80211_rx_h_action_post_userspace(struct ieee80211_rx_data *rx) |
|
{ |
|
struct ieee80211_sub_if_data *sdata = rx->sdata; |
|
struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; |
|
int len = rx->skb->len; |
|
|
|
if (!ieee80211_is_action(mgmt->frame_control)) |
|
return RX_CONTINUE; |
|
|
|
switch (mgmt->u.action.category) { |
|
case WLAN_CATEGORY_SA_QUERY: |
|
if (len < (IEEE80211_MIN_ACTION_SIZE + |
|
sizeof(mgmt->u.action.u.sa_query))) |
|
break; |
|
|
|
switch (mgmt->u.action.u.sa_query.action) { |
|
case WLAN_ACTION_SA_QUERY_REQUEST: |
|
if (sdata->vif.type != NL80211_IFTYPE_STATION) |
|
break; |
|
ieee80211_process_sa_query_req(sdata, mgmt, len); |
|
goto handled; |
|
} |
|
break; |
|
} |
|
|
|
return RX_CONTINUE; |
|
|
|
handled: |
|
if (rx->sta) |
|
rx->sta->rx_stats.packets++; |
|
dev_kfree_skb(rx->skb); |
|
return RX_QUEUED; |
|
} |
|
|
|
static ieee80211_rx_result debug_noinline |
|
ieee80211_rx_h_action_return(struct ieee80211_rx_data *rx) |
|
{ |
|
struct ieee80211_local *local = rx->local; |
|
struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; |
|
struct sk_buff *nskb; |
|
struct ieee80211_sub_if_data *sdata = rx->sdata; |
|
struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); |
|
|
|
if (!ieee80211_is_action(mgmt->frame_control)) |
|
return RX_CONTINUE; |
|
|
|
/* |
|
* For AP mode, hostapd is responsible for handling any action |
|
* frames that we didn't handle, including returning unknown |
|
* ones. For all other modes we will return them to the sender, |
|
* setting the 0x80 bit in the action category, as required by |
|
* 802.11-2012 9.24.4. |
|
* Newer versions of hostapd shall also use the management frame |
|
* registration mechanisms, but older ones still use cooked |
|
* monitor interfaces so push all frames there. |
|
*/ |
|
if (!(status->rx_flags & IEEE80211_RX_MALFORMED_ACTION_FRM) && |
|
(sdata->vif.type == NL80211_IFTYPE_AP || |
|
sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) |
|
return RX_DROP_MONITOR; |
|
|
|
if (is_multicast_ether_addr(mgmt->da)) |
|
return RX_DROP_MONITOR; |
|
|
|
/* do not return rejected action frames */ |
|
if (mgmt->u.action.category & 0x80) |
|
return RX_DROP_UNUSABLE; |
|
|
|
nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0, |
|
GFP_ATOMIC); |
|
if (nskb) { |
|
struct ieee80211_mgmt *nmgmt = (void *)nskb->data; |
|
|
|
nmgmt->u.action.category |= 0x80; |
|
memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN); |
|
memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN); |
|
|
|
memset(nskb->cb, 0, sizeof(nskb->cb)); |
|
|
|
if (rx->sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) { |
|
struct ieee80211_tx_info *info = IEEE80211_SKB_CB(nskb); |
|
|
|
info->flags = IEEE80211_TX_CTL_TX_OFFCHAN | |
|
IEEE80211_TX_INTFL_OFFCHAN_TX_OK | |
|
IEEE80211_TX_CTL_NO_CCK_RATE; |
|
if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) |
|
info->hw_queue = |
|
local->hw.offchannel_tx_hw_queue; |
|
} |
|
|
|
__ieee80211_tx_skb_tid_band(rx->sdata, nskb, 7, |
|
status->band); |
|
} |
|
dev_kfree_skb(rx->skb); |
|
return RX_QUEUED; |
|
} |
|
|
|
static ieee80211_rx_result debug_noinline |
|
ieee80211_rx_h_ext(struct ieee80211_rx_data *rx) |
|
{ |
|
struct ieee80211_sub_if_data *sdata = rx->sdata; |
|
struct ieee80211_hdr *hdr = (void *)rx->skb->data; |
|
|
|
if (!ieee80211_is_ext(hdr->frame_control)) |
|
return RX_CONTINUE; |
|
|
|
if (sdata->vif.type != NL80211_IFTYPE_STATION) |
|
return RX_DROP_MONITOR; |
|
|
|
/* for now only beacons are ext, so queue them */ |
|
skb_queue_tail(&sdata->skb_queue, rx->skb); |
|
ieee80211_queue_work(&rx->local->hw, &sdata->work); |
|
if (rx->sta) |
|
rx->sta->rx_stats.packets++; |
|
|
|
return RX_QUEUED; |
|
} |
|
|
|
static ieee80211_rx_result debug_noinline |
|
ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx) |
|
{ |
|
struct ieee80211_sub_if_data *sdata = rx->sdata; |
|
struct ieee80211_mgmt *mgmt = (void *)rx->skb->data; |
|
__le16 stype; |
|
|
|
stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE); |
|
|
|
if (!ieee80211_vif_is_mesh(&sdata->vif) && |
|
sdata->vif.type != NL80211_IFTYPE_ADHOC && |
|
sdata->vif.type != NL80211_IFTYPE_OCB && |
|
sdata->vif.type != NL80211_IFTYPE_STATION) |
|
return RX_DROP_MONITOR; |
|
|
|
switch (stype) { |
|
case cpu_to_le16(IEEE80211_STYPE_AUTH): |
|
case cpu_to_le16(IEEE80211_STYPE_BEACON): |
|
case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP): |
|
/* process for all: mesh, mlme, ibss */ |
|
break; |
|
case cpu_to_le16(IEEE80211_STYPE_DEAUTH): |
|
if (is_multicast_ether_addr(mgmt->da) && |
|
!is_broadcast_ether_addr(mgmt->da)) |
|
return RX_DROP_MONITOR; |
|
|
|
/* process only for station/IBSS */ |
|
if (sdata->vif.type != NL80211_IFTYPE_STATION && |
|
sdata->vif.type != NL80211_IFTYPE_ADHOC) |
|
return RX_DROP_MONITOR; |
|
break; |
|
case cpu_to_le16(IEEE80211_STYPE_ASSOC_RESP): |
|
case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP): |
|
case cpu_to_le16(IEEE80211_STYPE_DISASSOC): |
|
if (is_multicast_ether_addr(mgmt->da) && |
|
!is_broadcast_ether_addr(mgmt->da)) |
|
return RX_DROP_MONITOR; |
|
|
|
/* process only for station */ |
|
if (sdata->vif.type != NL80211_IFTYPE_STATION) |
|
return RX_DROP_MONITOR; |
|
break; |
|
case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ): |
|
/* process only for ibss and mesh */ |
|
if (sdata->vif.type != NL80211_IFTYPE_ADHOC && |
|
sdata->vif.type != NL80211_IFTYPE_MESH_POINT) |
|
return RX_DROP_MONITOR; |
|
break; |
|
default: |
|
return RX_DROP_MONITOR; |
|
} |
|
|
|
/* queue up frame and kick off work to process it */ |
|
skb_queue_tail(&sdata->skb_queue, rx->skb); |
|
ieee80211_queue_work(&rx->local->hw, &sdata->work); |
|
if (rx->sta) |
|
rx->sta->rx_stats.packets++; |
|
|
|
return RX_QUEUED; |
|
} |
|
|
|
static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx, |
|
struct ieee80211_rate *rate) |
|
{ |
|
struct ieee80211_sub_if_data *sdata; |
|
struct ieee80211_local *local = rx->local; |
|
struct sk_buff *skb = rx->skb, *skb2; |
|
struct net_device *prev_dev = NULL; |
|
struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
|
int needed_headroom; |
|
|
|
/* |
|
* If cooked monitor has been processed already, then |
|
* don't do it again. If not, set the flag. |
|
*/ |
|
if (rx->flags & IEEE80211_RX_CMNTR) |
|
goto out_free_skb; |
|
rx->flags |= IEEE80211_RX_CMNTR; |
|
|
|
/* If there are no cooked monitor interfaces, just free the SKB */ |
|
if (!local->cooked_mntrs) |
|
goto out_free_skb; |
|
|
|
/* vendor data is long removed here */ |
|
status->flag &= ~RX_FLAG_RADIOTAP_VENDOR_DATA; |
|
/* room for the radiotap header based on driver features */ |
|
needed_headroom = ieee80211_rx_radiotap_hdrlen(local, status, skb); |
|
|
|
if (skb_headroom(skb) < needed_headroom && |
|
pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) |
|
goto out_free_skb; |
|
|
|
/* prepend radiotap information */ |
|
ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom, |
|
false); |
|
|
|
skb_reset_mac_header(skb); |
|
skb->ip_summed = CHECKSUM_UNNECESSARY; |
|
skb->pkt_type = PACKET_OTHERHOST; |
|
skb->protocol = htons(ETH_P_802_2); |
|
|
|
list_for_each_entry_rcu(sdata, &local->interfaces, list) { |
|
if (!ieee80211_sdata_running(sdata)) |
|
continue; |
|
|
|
if (sdata->vif.type != NL80211_IFTYPE_MONITOR || |
|
!(sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES)) |
|
continue; |
|
|
|
if (prev_dev) { |
|
skb2 = skb_clone(skb, GFP_ATOMIC); |
|
if (skb2) { |
|
skb2->dev = prev_dev; |
|
netif_receive_skb(skb2); |
|
} |
|
} |
|
|
|
prev_dev = sdata->dev; |
|
dev_sw_netstats_rx_add(sdata->dev, skb->len); |
|
} |
|
|
|
if (prev_dev) { |
|
skb->dev = prev_dev; |
|
netif_receive_skb(skb); |
|
return; |
|
} |
|
|
|
out_free_skb: |
|
dev_kfree_skb(skb); |
|
} |
|
|
|
static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx, |
|
ieee80211_rx_result res) |
|
{ |
|
switch (res) { |
|
case RX_DROP_MONITOR: |
|
I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop); |
|
if (rx->sta) |
|
rx->sta->rx_stats.dropped++; |
|
fallthrough; |
|
case RX_CONTINUE: { |
|
struct ieee80211_rate *rate = NULL; |
|
struct ieee80211_supported_band *sband; |
|
struct ieee80211_rx_status *status; |
|
|
|
status = IEEE80211_SKB_RXCB((rx->skb)); |
|
|
|
sband = rx->local->hw.wiphy->bands[status->band]; |
|
if (status->encoding == RX_ENC_LEGACY) |
|
rate = &sband->bitrates[status->rate_idx]; |
|
|
|
ieee80211_rx_cooked_monitor(rx, rate); |
|
break; |
|
} |
|
case RX_DROP_UNUSABLE: |
|
I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop); |
|
if (rx->sta) |
|
rx->sta->rx_stats.dropped++; |
|
dev_kfree_skb(rx->skb); |
|
break; |
|
case RX_QUEUED: |
|
I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued); |
|
break; |
|
} |
|
} |
|
|
|
static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx, |
|
struct sk_buff_head *frames) |
|
{ |
|
ieee80211_rx_result res = RX_DROP_MONITOR; |
|
struct sk_buff *skb; |
|
|
|
#define CALL_RXH(rxh) \ |
|
do { \ |
|
res = rxh(rx); \ |
|
if (res != RX_CONTINUE) \ |
|
goto rxh_next; \ |
|
} while (0) |
|
|
|
/* Lock here to avoid hitting all of the data used in the RX |
|
* path (e.g. key data, station data, ...) concurrently when |
|
* a frame is released from the reorder buffer due to timeout |
|
* from the timer, potentially concurrently with RX from the |
|
* driver. |
|
*/ |
|
spin_lock_bh(&rx->local->rx_path_lock); |
|
|
|
while ((skb = __skb_dequeue(frames))) { |
|
/* |
|
* all the other fields are valid across frames |
|
* that belong to an aMPDU since they are on the |
|
* same TID from the same station |
|
*/ |
|
rx->skb = skb; |
|
|
|
CALL_RXH(ieee80211_rx_h_check_more_data); |
|
CALL_RXH(ieee80211_rx_h_uapsd_and_pspoll); |
|
CALL_RXH(ieee80211_rx_h_sta_process); |
|
CALL_RXH(ieee80211_rx_h_decrypt); |
|
CALL_RXH(ieee80211_rx_h_defragment); |
|
CALL_RXH(ieee80211_rx_h_michael_mic_verify); |
|
/* must be after MMIC verify so header is counted in MPDU mic */ |
|
#ifdef CONFIG_MAC80211_MESH |
|
if (ieee80211_vif_is_mesh(&rx->sdata->vif)) |
|
CALL_RXH(ieee80211_rx_h_mesh_fwding); |
|
#endif |
|
CALL_RXH(ieee80211_rx_h_amsdu); |
|
CALL_RXH(ieee80211_rx_h_data); |
|
|
|
/* special treatment -- needs the queue */ |
|
res = ieee80211_rx_h_ctrl(rx, frames); |
|
if (res != RX_CONTINUE) |
|
goto rxh_next; |
|
|
|
CALL_RXH(ieee80211_rx_h_mgmt_check); |
|
CALL_RXH(ieee80211_rx_h_action); |
|
CALL_RXH(ieee80211_rx_h_userspace_mgmt); |
|
CALL_RXH(ieee80211_rx_h_action_post_userspace); |
|
CALL_RXH(ieee80211_rx_h_action_return); |
|
CALL_RXH(ieee80211_rx_h_ext); |
|
CALL_RXH(ieee80211_rx_h_mgmt); |
|
|
|
rxh_next: |
|
ieee80211_rx_handlers_result(rx, res); |
|
|
|
#undef CALL_RXH |
|
} |
|
|
|
spin_unlock_bh(&rx->local->rx_path_lock); |
|
} |
|
|
|
static void ieee80211_invoke_rx_handlers(struct ieee80211_rx_data *rx) |
|
{ |
|
struct sk_buff_head reorder_release; |
|
ieee80211_rx_result res = RX_DROP_MONITOR; |
|
|
|
__skb_queue_head_init(&reorder_release); |
|
|
|
#define CALL_RXH(rxh) \ |
|
do { \ |
|
res = rxh(rx); \ |
|
if (res != RX_CONTINUE) \ |
|
goto rxh_next; \ |
|
} while (0) |
|
|
|
CALL_RXH(ieee80211_rx_h_check_dup); |
|
CALL_RXH(ieee80211_rx_h_check); |
|
|
|
ieee80211_rx_reorder_ampdu(rx, &reorder_release); |
|
|
|
ieee80211_rx_handlers(rx, &reorder_release); |
|
return; |
|
|
|
rxh_next: |
|
ieee80211_rx_handlers_result(rx, res); |
|
|
|
#undef CALL_RXH |
|
} |
|
|
|
/* |
|
* This function makes calls into the RX path, therefore |
|
* it has to be invoked under RCU read lock. |
|
*/ |
|
void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid) |
|
{ |
|
struct sk_buff_head frames; |
|
struct ieee80211_rx_data rx = { |
|
.sta = sta, |
|
.sdata = sta->sdata, |
|
.local = sta->local, |
|
/* This is OK -- must be QoS data frame */ |
|
.security_idx = tid, |
|
.seqno_idx = tid, |
|
}; |
|
struct tid_ampdu_rx *tid_agg_rx; |
|
|
|
tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]); |
|
if (!tid_agg_rx) |
|
return; |
|
|
|
__skb_queue_head_init(&frames); |
|
|
|
spin_lock(&tid_agg_rx->reorder_lock); |
|
ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames); |
|
spin_unlock(&tid_agg_rx->reorder_lock); |
|
|
|
if (!skb_queue_empty(&frames)) { |
|
struct ieee80211_event event = { |
|
.type = BA_FRAME_TIMEOUT, |
|
.u.ba.tid = tid, |
|
.u.ba.sta = &sta->sta, |
|
}; |
|
drv_event_callback(rx.local, rx.sdata, &event); |
|
} |
|
|
|
ieee80211_rx_handlers(&rx, &frames); |
|
} |
|
|
|
void ieee80211_mark_rx_ba_filtered_frames(struct ieee80211_sta *pubsta, u8 tid, |
|
u16 ssn, u64 filtered, |
|
u16 received_mpdus) |
|
{ |
|
struct sta_info *sta; |
|
struct tid_ampdu_rx *tid_agg_rx; |
|
struct sk_buff_head frames; |
|
struct ieee80211_rx_data rx = { |
|
/* This is OK -- must be QoS data frame */ |
|
.security_idx = tid, |
|
.seqno_idx = tid, |
|
}; |
|
int i, diff; |
|
|
|
if (WARN_ON(!pubsta || tid >= IEEE80211_NUM_TIDS)) |
|
return; |
|
|
|
__skb_queue_head_init(&frames); |
|
|
|
sta = container_of(pubsta, struct sta_info, sta); |
|
|
|
rx.sta = sta; |
|
rx.sdata = sta->sdata; |
|
rx.local = sta->local; |
|
|
|
rcu_read_lock(); |
|
tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]); |
|
if (!tid_agg_rx) |
|
goto out; |
|
|
|
spin_lock_bh(&tid_agg_rx->reorder_lock); |
|
|
|
if (received_mpdus >= IEEE80211_SN_MODULO >> 1) { |
|
int release; |
|
|
|
/* release all frames in the reorder buffer */ |
|
release = (tid_agg_rx->head_seq_num + tid_agg_rx->buf_size) % |
|
IEEE80211_SN_MODULO; |
|
ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx, |
|
release, &frames); |
|
/* update ssn to match received ssn */ |
|
tid_agg_rx->head_seq_num = ssn; |
|
} else { |
|
ieee80211_release_reorder_frames(sta->sdata, tid_agg_rx, ssn, |
|
&frames); |
|
} |
|
|
|
/* handle the case that received ssn is behind the mac ssn. |
|
* it can be tid_agg_rx->buf_size behind and still be valid */ |
|
diff = (tid_agg_rx->head_seq_num - ssn) & IEEE80211_SN_MASK; |
|
if (diff >= tid_agg_rx->buf_size) { |
|
tid_agg_rx->reorder_buf_filtered = 0; |
|
goto release; |
|
} |
|
filtered = filtered >> diff; |
|
ssn += diff; |
|
|
|
/* update bitmap */ |
|
for (i = 0; i < tid_agg_rx->buf_size; i++) { |
|
int index = (ssn + i) % tid_agg_rx->buf_size; |
|
|
|
tid_agg_rx->reorder_buf_filtered &= ~BIT_ULL(index); |
|
if (filtered & BIT_ULL(i)) |
|
tid_agg_rx->reorder_buf_filtered |= BIT_ULL(index); |
|
} |
|
|
|
/* now process also frames that the filter marking released */ |
|
ieee80211_sta_reorder_release(sta->sdata, tid_agg_rx, &frames); |
|
|
|
release: |
|
spin_unlock_bh(&tid_agg_rx->reorder_lock); |
|
|
|
ieee80211_rx_handlers(&rx, &frames); |
|
|
|
out: |
|
rcu_read_unlock(); |
|
} |
|
EXPORT_SYMBOL(ieee80211_mark_rx_ba_filtered_frames); |
|
|
|
/* main receive path */ |
|
|
|
static bool ieee80211_accept_frame(struct ieee80211_rx_data *rx) |
|
{ |
|
struct ieee80211_sub_if_data *sdata = rx->sdata; |
|
struct sk_buff *skb = rx->skb; |
|
struct ieee80211_hdr *hdr = (void *)skb->data; |
|
struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
|
u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type); |
|
bool multicast = is_multicast_ether_addr(hdr->addr1) || |
|
ieee80211_is_s1g_beacon(hdr->frame_control); |
|
|
|
switch (sdata->vif.type) { |
|
case NL80211_IFTYPE_STATION: |
|
if (!bssid && !sdata->u.mgd.use_4addr) |
|
return false; |
|
if (ieee80211_is_robust_mgmt_frame(skb) && !rx->sta) |
|
return false; |
|
if (multicast) |
|
return true; |
|
return ether_addr_equal(sdata->vif.addr, hdr->addr1); |
|
case NL80211_IFTYPE_ADHOC: |
|
if (!bssid) |
|
return false; |
|
if (ether_addr_equal(sdata->vif.addr, hdr->addr2) || |
|
ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2)) |
|
return false; |
|
if (ieee80211_is_beacon(hdr->frame_control)) |
|
return true; |
|
if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) |
|
return false; |
|
if (!multicast && |
|
!ether_addr_equal(sdata->vif.addr, hdr->addr1)) |
|
return false; |
|
if (!rx->sta) { |
|
int rate_idx; |
|
if (status->encoding != RX_ENC_LEGACY) |
|
rate_idx = 0; /* TODO: HT/VHT rates */ |
|
else |
|
rate_idx = status->rate_idx; |
|
ieee80211_ibss_rx_no_sta(sdata, bssid, hdr->addr2, |
|
BIT(rate_idx)); |
|
} |
|
return true; |
|
case NL80211_IFTYPE_OCB: |
|
if (!bssid) |
|
return false; |
|
if (!ieee80211_is_data_present(hdr->frame_control)) |
|
return false; |
|
if (!is_broadcast_ether_addr(bssid)) |
|
return false; |
|
if (!multicast && |
|
!ether_addr_equal(sdata->dev->dev_addr, hdr->addr1)) |
|
return false; |
|
if (!rx->sta) { |
|
int rate_idx; |
|
if (status->encoding != RX_ENC_LEGACY) |
|
rate_idx = 0; /* TODO: HT rates */ |
|
else |
|
rate_idx = status->rate_idx; |
|
ieee80211_ocb_rx_no_sta(sdata, bssid, hdr->addr2, |
|
BIT(rate_idx)); |
|
} |
|
return true; |
|
case NL80211_IFTYPE_MESH_POINT: |
|
if (ether_addr_equal(sdata->vif.addr, hdr->addr2)) |
|
return false; |
|
if (multicast) |
|
return true; |
|
return ether_addr_equal(sdata->vif.addr, hdr->addr1); |
|
case NL80211_IFTYPE_AP_VLAN: |
|
case NL80211_IFTYPE_AP: |
|
if (!bssid) |
|
return ether_addr_equal(sdata->vif.addr, hdr->addr1); |
|
|
|
if (!ieee80211_bssid_match(bssid, sdata->vif.addr)) { |
|
/* |
|
* Accept public action frames even when the |
|
* BSSID doesn't match, this is used for P2P |
|
* and location updates. Note that mac80211 |
|
* itself never looks at these frames. |
|
*/ |
|
if (!multicast && |
|
!ether_addr_equal(sdata->vif.addr, hdr->addr1)) |
|
return false; |
|
if (ieee80211_is_public_action(hdr, skb->len)) |
|
return true; |
|
return ieee80211_is_beacon(hdr->frame_control); |
|
} |
|
|
|
if (!ieee80211_has_tods(hdr->frame_control)) { |
|
/* ignore data frames to TDLS-peers */ |
|
if (ieee80211_is_data(hdr->frame_control)) |
|
return false; |
|
/* ignore action frames to TDLS-peers */ |
|
if (ieee80211_is_action(hdr->frame_control) && |
|
!is_broadcast_ether_addr(bssid) && |
|
!ether_addr_equal(bssid, hdr->addr1)) |
|
return false; |
|
} |
|
|
|
/* |
|
* 802.11-2016 Table 9-26 says that for data frames, A1 must be |
|
* the BSSID - we've checked that already but may have accepted |
|
* the wildcard (ff:ff:ff:ff:ff:ff). |
|
* |
|
* It also says: |
|
* The BSSID of the Data frame is determined as follows: |
|
* a) If the STA is contained within an AP or is associated |
|
* with an AP, the BSSID is the address currently in use |
|
* by the STA contained in the AP. |
|
* |
|
* So we should not accept data frames with an address that's |
|
* multicast. |
|
* |
|
* Accepting it also opens a security problem because stations |
|
* could encrypt it with the GTK and inject traffic that way. |
|
*/ |
|
if (ieee80211_is_data(hdr->frame_control) && multicast) |
|
return false; |
|
|
|
return true; |
|
case NL80211_IFTYPE_P2P_DEVICE: |
|
return ieee80211_is_public_action(hdr, skb->len) || |
|
ieee80211_is_probe_req(hdr->frame_control) || |
|
ieee80211_is_probe_resp(hdr->frame_control) || |
|
ieee80211_is_beacon(hdr->frame_control); |
|
case NL80211_IFTYPE_NAN: |
|
/* Currently no frames on NAN interface are allowed */ |
|
return false; |
|
default: |
|
break; |
|
} |
|
|
|
WARN_ON_ONCE(1); |
|
return false; |
|
} |
|
|
|
void ieee80211_check_fast_rx(struct sta_info *sta) |
|
{ |
|
struct ieee80211_sub_if_data *sdata = sta->sdata; |
|
struct ieee80211_local *local = sdata->local; |
|
struct ieee80211_key *key; |
|
struct ieee80211_fast_rx fastrx = { |
|
.dev = sdata->dev, |
|
.vif_type = sdata->vif.type, |
|
.control_port_protocol = sdata->control_port_protocol, |
|
}, *old, *new = NULL; |
|
bool set_offload = false; |
|
bool assign = false; |
|
bool offload; |
|
|
|
/* use sparse to check that we don't return without updating */ |
|
__acquire(check_fast_rx); |
|
|
|
BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != sizeof(rfc1042_header)); |
|
BUILD_BUG_ON(sizeof(fastrx.rfc1042_hdr) != ETH_ALEN); |
|
ether_addr_copy(fastrx.rfc1042_hdr, rfc1042_header); |
|
ether_addr_copy(fastrx.vif_addr, sdata->vif.addr); |
|
|
|
fastrx.uses_rss = ieee80211_hw_check(&local->hw, USES_RSS); |
|
|
|
/* fast-rx doesn't do reordering */ |
|
if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) && |
|
!ieee80211_hw_check(&local->hw, SUPPORTS_REORDERING_BUFFER)) |
|
goto clear; |
|
|
|
switch (sdata->vif.type) { |
|
case NL80211_IFTYPE_STATION: |
|
if (sta->sta.tdls) { |
|
fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1); |
|
fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2); |
|
fastrx.expected_ds_bits = 0; |
|
} else { |
|
fastrx.da_offs = offsetof(struct ieee80211_hdr, addr1); |
|
fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr3); |
|
fastrx.expected_ds_bits = |
|
cpu_to_le16(IEEE80211_FCTL_FROMDS); |
|
} |
|
|
|
if (sdata->u.mgd.use_4addr && !sta->sta.tdls) { |
|
fastrx.expected_ds_bits |= |
|
cpu_to_le16(IEEE80211_FCTL_TODS); |
|
fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3); |
|
fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr4); |
|
} |
|
|
|
if (!sdata->u.mgd.powersave) |
|
break; |
|
|
|
/* software powersave is a huge mess, avoid all of it */ |
|
if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK)) |
|
goto clear; |
|
if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) && |
|
!ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS)) |
|
goto clear; |
|
break; |
|
case NL80211_IFTYPE_AP_VLAN: |
|
case NL80211_IFTYPE_AP: |
|
/* parallel-rx requires this, at least with calls to |
|
* ieee80211_sta_ps_transition() |
|
*/ |
|
if (!ieee80211_hw_check(&local->hw, AP_LINK_PS)) |
|
goto clear; |
|
fastrx.da_offs = offsetof(struct ieee80211_hdr, addr3); |
|
fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr2); |
|
fastrx.expected_ds_bits = cpu_to_le16(IEEE80211_FCTL_TODS); |
|
|
|
fastrx.internal_forward = |
|
!(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) && |
|
(sdata->vif.type != NL80211_IFTYPE_AP_VLAN || |
|
!sdata->u.vlan.sta); |
|
|
|
if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN && |
|
sdata->u.vlan.sta) { |
|
fastrx.expected_ds_bits |= |
|
cpu_to_le16(IEEE80211_FCTL_FROMDS); |
|
fastrx.sa_offs = offsetof(struct ieee80211_hdr, addr4); |
|
fastrx.internal_forward = 0; |
|
} |
|
|
|
break; |
|
default: |
|
goto clear; |
|
} |
|
|
|
if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED)) |
|
goto clear; |
|
|
|
rcu_read_lock(); |
|
key = rcu_dereference(sta->ptk[sta->ptk_idx]); |
|
if (!key) |
|
key = rcu_dereference(sdata->default_unicast_key); |
|
if (key) { |
|
switch (key->conf.cipher) { |
|
case WLAN_CIPHER_SUITE_TKIP: |
|
/* we don't want to deal with MMIC in fast-rx */ |
|
goto clear_rcu; |
|
case WLAN_CIPHER_SUITE_CCMP: |
|
case WLAN_CIPHER_SUITE_CCMP_256: |
|
case WLAN_CIPHER_SUITE_GCMP: |
|
case WLAN_CIPHER_SUITE_GCMP_256: |
|
break; |
|
default: |
|
/* We also don't want to deal with |
|
* WEP or cipher scheme. |
|
*/ |
|
goto clear_rcu; |
|
} |
|
|
|
fastrx.key = true; |
|
fastrx.icv_len = key->conf.icv_len; |
|
} |
|
|
|
assign = true; |
|
clear_rcu: |
|
rcu_read_unlock(); |
|
clear: |
|
__release(check_fast_rx); |
|
|
|
if (assign) |
|
new = kmemdup(&fastrx, sizeof(fastrx), GFP_KERNEL); |
|
|
|
offload = assign && |
|
(sdata->vif.offload_flags & IEEE80211_OFFLOAD_DECAP_ENABLED); |
|
|
|
if (offload) |
|
set_offload = !test_and_set_sta_flag(sta, WLAN_STA_DECAP_OFFLOAD); |
|
else |
|
set_offload = test_and_clear_sta_flag(sta, WLAN_STA_DECAP_OFFLOAD); |
|
|
|
if (set_offload) |
|
drv_sta_set_decap_offload(local, sdata, &sta->sta, assign); |
|
|
|
spin_lock_bh(&sta->lock); |
|
old = rcu_dereference_protected(sta->fast_rx, true); |
|
rcu_assign_pointer(sta->fast_rx, new); |
|
spin_unlock_bh(&sta->lock); |
|
|
|
if (old) |
|
kfree_rcu(old, rcu_head); |
|
} |
|
|
|
void ieee80211_clear_fast_rx(struct sta_info *sta) |
|
{ |
|
struct ieee80211_fast_rx *old; |
|
|
|
spin_lock_bh(&sta->lock); |
|
old = rcu_dereference_protected(sta->fast_rx, true); |
|
RCU_INIT_POINTER(sta->fast_rx, NULL); |
|
spin_unlock_bh(&sta->lock); |
|
|
|
if (old) |
|
kfree_rcu(old, rcu_head); |
|
} |
|
|
|
void __ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata) |
|
{ |
|
struct ieee80211_local *local = sdata->local; |
|
struct sta_info *sta; |
|
|
|
lockdep_assert_held(&local->sta_mtx); |
|
|
|
list_for_each_entry(sta, &local->sta_list, list) { |
|
if (sdata != sta->sdata && |
|
(!sta->sdata->bss || sta->sdata->bss != sdata->bss)) |
|
continue; |
|
ieee80211_check_fast_rx(sta); |
|
} |
|
} |
|
|
|
void ieee80211_check_fast_rx_iface(struct ieee80211_sub_if_data *sdata) |
|
{ |
|
struct ieee80211_local *local = sdata->local; |
|
|
|
mutex_lock(&local->sta_mtx); |
|
__ieee80211_check_fast_rx_iface(sdata); |
|
mutex_unlock(&local->sta_mtx); |
|
} |
|
|
|
static void ieee80211_rx_8023(struct ieee80211_rx_data *rx, |
|
struct ieee80211_fast_rx *fast_rx, |
|
int orig_len) |
|
{ |
|
struct ieee80211_sta_rx_stats *stats; |
|
struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); |
|
struct sta_info *sta = rx->sta; |
|
struct sk_buff *skb = rx->skb; |
|
void *sa = skb->data + ETH_ALEN; |
|
void *da = skb->data; |
|
|
|
stats = &sta->rx_stats; |
|
if (fast_rx->uses_rss) |
|
stats = this_cpu_ptr(sta->pcpu_rx_stats); |
|
|
|
/* statistics part of ieee80211_rx_h_sta_process() */ |
|
if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) { |
|
stats->last_signal = status->signal; |
|
if (!fast_rx->uses_rss) |
|
ewma_signal_add(&sta->rx_stats_avg.signal, |
|
-status->signal); |
|
} |
|
|
|
if (status->chains) { |
|
int i; |
|
|
|
stats->chains = status->chains; |
|
for (i = 0; i < ARRAY_SIZE(status->chain_signal); i++) { |
|
int signal = status->chain_signal[i]; |
|
|
|
if (!(status->chains & BIT(i))) |
|
continue; |
|
|
|
stats->chain_signal_last[i] = signal; |
|
if (!fast_rx->uses_rss) |
|
ewma_signal_add(&sta->rx_stats_avg.chain_signal[i], |
|
-signal); |
|
} |
|
} |
|
/* end of statistics */ |
|
|
|
stats->last_rx = jiffies; |
|
stats->last_rate = sta_stats_encode_rate(status); |
|
|
|
stats->fragments++; |
|
stats->packets++; |
|
|
|
skb->dev = fast_rx->dev; |
|
|
|
dev_sw_netstats_rx_add(fast_rx->dev, skb->len); |
|
|
|
/* The seqno index has the same property as needed |
|
* for the rx_msdu field, i.e. it is IEEE80211_NUM_TIDS |
|
* for non-QoS-data frames. Here we know it's a data |
|
* frame, so count MSDUs. |
|
*/ |
|
u64_stats_update_begin(&stats->syncp); |
|
stats->msdu[rx->seqno_idx]++; |
|
stats->bytes += orig_len; |
|
u64_stats_update_end(&stats->syncp); |
|
|
|
if (fast_rx->internal_forward) { |
|
struct sk_buff *xmit_skb = NULL; |
|
if (is_multicast_ether_addr(da)) { |
|
xmit_skb = skb_copy(skb, GFP_ATOMIC); |
|
} else if (!ether_addr_equal(da, sa) && |
|
sta_info_get(rx->sdata, da)) { |
|
xmit_skb = skb; |
|
skb = NULL; |
|
} |
|
|
|
if (xmit_skb) { |
|
/* |
|
* Send to wireless media and increase priority by 256 |
|
* to keep the received priority instead of |
|
* reclassifying the frame (see cfg80211_classify8021d). |
|
*/ |
|
xmit_skb->priority += 256; |
|
xmit_skb->protocol = htons(ETH_P_802_3); |
|
skb_reset_network_header(xmit_skb); |
|
skb_reset_mac_header(xmit_skb); |
|
dev_queue_xmit(xmit_skb); |
|
} |
|
|
|
if (!skb) |
|
return; |
|
} |
|
|
|
/* deliver to local stack */ |
|
skb->protocol = eth_type_trans(skb, fast_rx->dev); |
|
memset(skb->cb, 0, sizeof(skb->cb)); |
|
if (rx->list) |
|
list_add_tail(&skb->list, rx->list); |
|
else |
|
netif_receive_skb(skb); |
|
|
|
} |
|
|
|
static bool ieee80211_invoke_fast_rx(struct ieee80211_rx_data *rx, |
|
struct ieee80211_fast_rx *fast_rx) |
|
{ |
|
struct sk_buff *skb = rx->skb; |
|
struct ieee80211_hdr *hdr = (void *)skb->data; |
|
struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
|
struct sta_info *sta = rx->sta; |
|
int orig_len = skb->len; |
|
int hdrlen = ieee80211_hdrlen(hdr->frame_control); |
|
int snap_offs = hdrlen; |
|
struct { |
|
u8 snap[sizeof(rfc1042_header)]; |
|
__be16 proto; |
|
} *payload __aligned(2); |
|
struct { |
|
u8 da[ETH_ALEN]; |
|
u8 sa[ETH_ALEN]; |
|
} addrs __aligned(2); |
|
struct ieee80211_sta_rx_stats *stats = &sta->rx_stats; |
|
|
|
/* for parallel-rx, we need to have DUP_VALIDATED, otherwise we write |
|
* to a common data structure; drivers can implement that per queue |
|
* but we don't have that information in mac80211 |
|
*/ |
|
if (!(status->flag & RX_FLAG_DUP_VALIDATED)) |
|
return false; |
|
|
|
#define FAST_RX_CRYPT_FLAGS (RX_FLAG_PN_VALIDATED | RX_FLAG_DECRYPTED) |
|
|
|
/* If using encryption, we also need to have: |
|
* - PN_VALIDATED: similar, but the implementation is tricky |
|
* - DECRYPTED: necessary for PN_VALIDATED |
|
*/ |
|
if (fast_rx->key && |
|
(status->flag & FAST_RX_CRYPT_FLAGS) != FAST_RX_CRYPT_FLAGS) |
|
return false; |
|
|
|
if (unlikely(!ieee80211_is_data_present(hdr->frame_control))) |
|
return false; |
|
|
|
if (unlikely(ieee80211_is_frag(hdr))) |
|
return false; |
|
|
|
/* Since our interface address cannot be multicast, this |
|
* implicitly also rejects multicast frames without the |
|
* explicit check. |
|
* |
|
* We shouldn't get any *data* frames not addressed to us |
|
* (AP mode will accept multicast *management* frames), but |
|
* punting here will make it go through the full checks in |
|
* ieee80211_accept_frame(). |
|
*/ |
|
if (!ether_addr_equal(fast_rx->vif_addr, hdr->addr1)) |
|
return false; |
|
|
|
if ((hdr->frame_control & cpu_to_le16(IEEE80211_FCTL_FROMDS | |
|
IEEE80211_FCTL_TODS)) != |
|
fast_rx->expected_ds_bits) |
|
return false; |
|
|
|
/* assign the key to drop unencrypted frames (later) |
|
* and strip the IV/MIC if necessary |
|
*/ |
|
if (fast_rx->key && !(status->flag & RX_FLAG_IV_STRIPPED)) { |
|
/* GCMP header length is the same */ |
|
snap_offs += IEEE80211_CCMP_HDR_LEN; |
|
} |
|
|
|
if (!(status->rx_flags & IEEE80211_RX_AMSDU)) { |
|
if (!pskb_may_pull(skb, snap_offs + sizeof(*payload))) |
|
goto drop; |
|
|
|
payload = (void *)(skb->data + snap_offs); |
|
|
|
if (!ether_addr_equal(payload->snap, fast_rx->rfc1042_hdr)) |
|
return false; |
|
|
|
/* Don't handle these here since they require special code. |
|
* Accept AARP and IPX even though they should come with a |
|
* bridge-tunnel header - but if we get them this way then |
|
* there's little point in discarding them. |
|
*/ |
|
if (unlikely(payload->proto == cpu_to_be16(ETH_P_TDLS) || |
|
payload->proto == fast_rx->control_port_protocol)) |
|
return false; |
|
} |
|
|
|
/* after this point, don't punt to the slowpath! */ |
|
|
|
if (rx->key && !(status->flag & RX_FLAG_MIC_STRIPPED) && |
|
pskb_trim(skb, skb->len - fast_rx->icv_len)) |
|
goto drop; |
|
|
|
if (rx->key && !ieee80211_has_protected(hdr->frame_control)) |
|
goto drop; |
|
|
|
if (status->rx_flags & IEEE80211_RX_AMSDU) { |
|
if (__ieee80211_rx_h_amsdu(rx, snap_offs - hdrlen) != |
|
RX_QUEUED) |
|
goto drop; |
|
|
|
return true; |
|
} |
|
|
|
/* do the header conversion - first grab the addresses */ |
|
ether_addr_copy(addrs.da, skb->data + fast_rx->da_offs); |
|
ether_addr_copy(addrs.sa, skb->data + fast_rx->sa_offs); |
|
/* remove the SNAP but leave the ethertype */ |
|
skb_pull(skb, snap_offs + sizeof(rfc1042_header)); |
|
/* push the addresses in front */ |
|
memcpy(skb_push(skb, sizeof(addrs)), &addrs, sizeof(addrs)); |
|
|
|
ieee80211_rx_8023(rx, fast_rx, orig_len); |
|
|
|
return true; |
|
drop: |
|
dev_kfree_skb(skb); |
|
if (fast_rx->uses_rss) |
|
stats = this_cpu_ptr(sta->pcpu_rx_stats); |
|
|
|
stats->dropped++; |
|
return true; |
|
} |
|
|
|
/* |
|
* This function returns whether or not the SKB |
|
* was destined for RX processing or not, which, |
|
* if consume is true, is equivalent to whether |
|
* or not the skb was consumed. |
|
*/ |
|
static bool ieee80211_prepare_and_rx_handle(struct ieee80211_rx_data *rx, |
|
struct sk_buff *skb, bool consume) |
|
{ |
|
struct ieee80211_local *local = rx->local; |
|
struct ieee80211_sub_if_data *sdata = rx->sdata; |
|
|
|
rx->skb = skb; |
|
|
|
/* See if we can do fast-rx; if we have to copy we already lost, |
|
* so punt in that case. We should never have to deliver a data |
|
* frame to multiple interfaces anyway. |
|
* |
|
* We skip the ieee80211_accept_frame() call and do the necessary |
|
* checking inside ieee80211_invoke_fast_rx(). |
|
*/ |
|
if (consume && rx->sta) { |
|
struct ieee80211_fast_rx *fast_rx; |
|
|
|
fast_rx = rcu_dereference(rx->sta->fast_rx); |
|
if (fast_rx && ieee80211_invoke_fast_rx(rx, fast_rx)) |
|
return true; |
|
} |
|
|
|
if (!ieee80211_accept_frame(rx)) |
|
return false; |
|
|
|
if (!consume) { |
|
skb = skb_copy(skb, GFP_ATOMIC); |
|
if (!skb) { |
|
if (net_ratelimit()) |
|
wiphy_debug(local->hw.wiphy, |
|
"failed to copy skb for %s\n", |
|
sdata->name); |
|
return true; |
|
} |
|
|
|
rx->skb = skb; |
|
} |
|
|
|
ieee80211_invoke_rx_handlers(rx); |
|
return true; |
|
} |
|
|
|
static void __ieee80211_rx_handle_8023(struct ieee80211_hw *hw, |
|
struct ieee80211_sta *pubsta, |
|
struct sk_buff *skb, |
|
struct list_head *list) |
|
{ |
|
struct ieee80211_local *local = hw_to_local(hw); |
|
struct ieee80211_fast_rx *fast_rx; |
|
struct ieee80211_rx_data rx; |
|
|
|
memset(&rx, 0, sizeof(rx)); |
|
rx.skb = skb; |
|
rx.local = local; |
|
rx.list = list; |
|
|
|
I802_DEBUG_INC(local->dot11ReceivedFragmentCount); |
|
|
|
/* drop frame if too short for header */ |
|
if (skb->len < sizeof(struct ethhdr)) |
|
goto drop; |
|
|
|
if (!pubsta) |
|
goto drop; |
|
|
|
rx.sta = container_of(pubsta, struct sta_info, sta); |
|
rx.sdata = rx.sta->sdata; |
|
|
|
fast_rx = rcu_dereference(rx.sta->fast_rx); |
|
if (!fast_rx) |
|
goto drop; |
|
|
|
ieee80211_rx_8023(&rx, fast_rx, skb->len); |
|
return; |
|
|
|
drop: |
|
dev_kfree_skb(skb); |
|
} |
|
|
|
/* |
|
* This is the actual Rx frames handler. as it belongs to Rx path it must |
|
* be called with rcu_read_lock protection. |
|
*/ |
|
static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw, |
|
struct ieee80211_sta *pubsta, |
|
struct sk_buff *skb, |
|
struct list_head *list) |
|
{ |
|
struct ieee80211_local *local = hw_to_local(hw); |
|
struct ieee80211_sub_if_data *sdata; |
|
struct ieee80211_hdr *hdr; |
|
__le16 fc; |
|
struct ieee80211_rx_data rx; |
|
struct ieee80211_sub_if_data *prev; |
|
struct rhlist_head *tmp; |
|
int err = 0; |
|
|
|
fc = ((struct ieee80211_hdr *)skb->data)->frame_control; |
|
memset(&rx, 0, sizeof(rx)); |
|
rx.skb = skb; |
|
rx.local = local; |
|
rx.list = list; |
|
|
|
if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc)) |
|
I802_DEBUG_INC(local->dot11ReceivedFragmentCount); |
|
|
|
if (ieee80211_is_mgmt(fc)) { |
|
/* drop frame if too short for header */ |
|
if (skb->len < ieee80211_hdrlen(fc)) |
|
err = -ENOBUFS; |
|
else |
|
err = skb_linearize(skb); |
|
} else { |
|
err = !pskb_may_pull(skb, ieee80211_hdrlen(fc)); |
|
} |
|
|
|
if (err) { |
|
dev_kfree_skb(skb); |
|
return; |
|
} |
|
|
|
hdr = (struct ieee80211_hdr *)skb->data; |
|
ieee80211_parse_qos(&rx); |
|
ieee80211_verify_alignment(&rx); |
|
|
|
if (unlikely(ieee80211_is_probe_resp(hdr->frame_control) || |
|
ieee80211_is_beacon(hdr->frame_control) || |
|
ieee80211_is_s1g_beacon(hdr->frame_control))) |
|
ieee80211_scan_rx(local, skb); |
|
|
|
if (ieee80211_is_data(fc)) { |
|
struct sta_info *sta, *prev_sta; |
|
|
|
if (pubsta) { |
|
rx.sta = container_of(pubsta, struct sta_info, sta); |
|
rx.sdata = rx.sta->sdata; |
|
if (ieee80211_prepare_and_rx_handle(&rx, skb, true)) |
|
return; |
|
goto out; |
|
} |
|
|
|
prev_sta = NULL; |
|
|
|
for_each_sta_info(local, hdr->addr2, sta, tmp) { |
|
if (!prev_sta) { |
|
prev_sta = sta; |
|
continue; |
|
} |
|
|
|
rx.sta = prev_sta; |
|
rx.sdata = prev_sta->sdata; |
|
ieee80211_prepare_and_rx_handle(&rx, skb, false); |
|
|
|
prev_sta = sta; |
|
} |
|
|
|
if (prev_sta) { |
|
rx.sta = prev_sta; |
|
rx.sdata = prev_sta->sdata; |
|
|
|
if (ieee80211_prepare_and_rx_handle(&rx, skb, true)) |
|
return; |
|
goto out; |
|
} |
|
} |
|
|
|
prev = NULL; |
|
|
|
list_for_each_entry_rcu(sdata, &local->interfaces, list) { |
|
if (!ieee80211_sdata_running(sdata)) |
|
continue; |
|
|
|
if (sdata->vif.type == NL80211_IFTYPE_MONITOR || |
|
sdata->vif.type == NL80211_IFTYPE_AP_VLAN) |
|
continue; |
|
|
|
/* |
|
* frame is destined for this interface, but if it's |
|
* not also for the previous one we handle that after |
|
* the loop to avoid copying the SKB once too much |
|
*/ |
|
|
|
if (!prev) { |
|
prev = sdata; |
|
continue; |
|
} |
|
|
|
rx.sta = sta_info_get_bss(prev, hdr->addr2); |
|
rx.sdata = prev; |
|
ieee80211_prepare_and_rx_handle(&rx, skb, false); |
|
|
|
prev = sdata; |
|
} |
|
|
|
if (prev) { |
|
rx.sta = sta_info_get_bss(prev, hdr->addr2); |
|
rx.sdata = prev; |
|
|
|
if (ieee80211_prepare_and_rx_handle(&rx, skb, true)) |
|
return; |
|
} |
|
|
|
out: |
|
dev_kfree_skb(skb); |
|
} |
|
|
|
/* |
|
* This is the receive path handler. It is called by a low level driver when an |
|
* 802.11 MPDU is received from the hardware. |
|
*/ |
|
void ieee80211_rx_list(struct ieee80211_hw *hw, struct ieee80211_sta *pubsta, |
|
struct sk_buff *skb, struct list_head *list) |
|
{ |
|
struct ieee80211_local *local = hw_to_local(hw); |
|
struct ieee80211_rate *rate = NULL; |
|
struct ieee80211_supported_band *sband; |
|
struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
|
|
|
WARN_ON_ONCE(softirq_count() == 0); |
|
|
|
if (WARN_ON(status->band >= NUM_NL80211_BANDS)) |
|
goto drop; |
|
|
|
sband = local->hw.wiphy->bands[status->band]; |
|
if (WARN_ON(!sband)) |
|
goto drop; |
|
|
|
/* |
|
* If we're suspending, it is possible although not too likely |
|
* that we'd be receiving frames after having already partially |
|
* quiesced the stack. We can't process such frames then since |
|
* that might, for example, cause stations to be added or other |
|
* driver callbacks be invoked. |
|
*/ |
|
if (unlikely(local->quiescing || local->suspended)) |
|
goto drop; |
|
|
|
/* We might be during a HW reconfig, prevent Rx for the same reason */ |
|
if (unlikely(local->in_reconfig)) |
|
goto drop; |
|
|
|
/* |
|
* The same happens when we're not even started, |
|
* but that's worth a warning. |
|
*/ |
|
if (WARN_ON(!local->started)) |
|
goto drop; |
|
|
|
if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) { |
|
/* |
|
* Validate the rate, unless a PLCP error means that |
|
* we probably can't have a valid rate here anyway. |
|
*/ |
|
|
|
switch (status->encoding) { |
|
case RX_ENC_HT: |
|
/* |
|
* rate_idx is MCS index, which can be [0-76] |
|
* as documented on: |
|
* |
|
* https://wireless.wiki.kernel.org/en/developers/Documentation/ieee80211/802.11n |
|
* |
|
* Anything else would be some sort of driver or |
|
* hardware error. The driver should catch hardware |
|
* errors. |
|
*/ |
|
if (WARN(status->rate_idx > 76, |
|
"Rate marked as an HT rate but passed " |
|
"status->rate_idx is not " |
|
"an MCS index [0-76]: %d (0x%02x)\n", |
|
status->rate_idx, |
|
status->rate_idx)) |
|
goto drop; |
|
break; |
|
case RX_ENC_VHT: |
|
if (WARN_ONCE(status->rate_idx > 9 || |
|
!status->nss || |
|
status->nss > 8, |
|
"Rate marked as a VHT rate but data is invalid: MCS: %d, NSS: %d\n", |
|
status->rate_idx, status->nss)) |
|
goto drop; |
|
break; |
|
case RX_ENC_HE: |
|
if (WARN_ONCE(status->rate_idx > 11 || |
|
!status->nss || |
|
status->nss > 8, |
|
"Rate marked as an HE rate but data is invalid: MCS: %d, NSS: %d\n", |
|
status->rate_idx, status->nss)) |
|
goto drop; |
|
break; |
|
default: |
|
WARN_ON_ONCE(1); |
|
fallthrough; |
|
case RX_ENC_LEGACY: |
|
if (WARN_ON(status->rate_idx >= sband->n_bitrates)) |
|
goto drop; |
|
rate = &sband->bitrates[status->rate_idx]; |
|
} |
|
} |
|
|
|
status->rx_flags = 0; |
|
|
|
kcov_remote_start_common(skb_get_kcov_handle(skb)); |
|
|
|
/* |
|
* Frames with failed FCS/PLCP checksum are not returned, |
|
* all other frames are returned without radiotap header |
|
* if it was previously present. |
|
* Also, frames with less than 16 bytes are dropped. |
|
*/ |
|
if (!(status->flag & RX_FLAG_8023)) |
|
skb = ieee80211_rx_monitor(local, skb, rate); |
|
if (skb) { |
|
ieee80211_tpt_led_trig_rx(local, |
|
((struct ieee80211_hdr *)skb->data)->frame_control, |
|
skb->len); |
|
|
|
if (status->flag & RX_FLAG_8023) |
|
__ieee80211_rx_handle_8023(hw, pubsta, skb, list); |
|
else |
|
__ieee80211_rx_handle_packet(hw, pubsta, skb, list); |
|
} |
|
|
|
kcov_remote_stop(); |
|
return; |
|
drop: |
|
kfree_skb(skb); |
|
} |
|
EXPORT_SYMBOL(ieee80211_rx_list); |
|
|
|
void ieee80211_rx_napi(struct ieee80211_hw *hw, struct ieee80211_sta *pubsta, |
|
struct sk_buff *skb, struct napi_struct *napi) |
|
{ |
|
struct sk_buff *tmp; |
|
LIST_HEAD(list); |
|
|
|
|
|
/* |
|
* key references and virtual interfaces are protected using RCU |
|
* and this requires that we are in a read-side RCU section during |
|
* receive processing |
|
*/ |
|
rcu_read_lock(); |
|
ieee80211_rx_list(hw, pubsta, skb, &list); |
|
rcu_read_unlock(); |
|
|
|
if (!napi) { |
|
netif_receive_skb_list(&list); |
|
return; |
|
} |
|
|
|
list_for_each_entry_safe(skb, tmp, &list, list) { |
|
skb_list_del_init(skb); |
|
napi_gro_receive(napi, skb); |
|
} |
|
} |
|
EXPORT_SYMBOL(ieee80211_rx_napi); |
|
|
|
/* This is a version of the rx handler that can be called from hard irq |
|
* context. Post the skb on the queue and schedule the tasklet */ |
|
void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb) |
|
{ |
|
struct ieee80211_local *local = hw_to_local(hw); |
|
|
|
BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb)); |
|
|
|
skb->pkt_type = IEEE80211_RX_MSG; |
|
skb_queue_tail(&local->skb_queue, skb); |
|
tasklet_schedule(&local->tasklet); |
|
} |
|
EXPORT_SYMBOL(ieee80211_rx_irqsafe);
|
|
|