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// SPDX-License-Identifier: GPL-2.0-only
/*
* Datapath implementation.
*
* Copyright (c) 2017-2019, Silicon Laboratories, Inc.
* Copyright (c) 2010, ST-Ericsson
*/
#include <linux/etherdevice.h>
#include <net/mac80211.h>
#include "data_rx.h"
#include "wfx.h"
#include "bh.h"
#include "sta.h"
static int wfx_handle_pspoll(struct wfx_vif *wvif, struct sk_buff *skb)
{
struct ieee80211_sta *sta;
struct ieee80211_pspoll *pspoll = (struct ieee80211_pspoll *)skb->data;
int link_id = 0;
u32 pspoll_mask = 0;
int i;
if (wvif->state != WFX_STATE_AP)
return 1;
if (!ether_addr_equal(wvif->vif->addr, pspoll->bssid))
return 1;
rcu_read_lock();
sta = ieee80211_find_sta(wvif->vif, pspoll->ta);
if (sta)
link_id = ((struct wfx_sta_priv *)&sta->drv_priv)->link_id;
rcu_read_unlock();
if (link_id)
pspoll_mask = BIT(link_id);
else
return 1;
wvif->pspoll_mask |= pspoll_mask;
/* Do not report pspols if data for given link id is queued already. */
for (i = 0; i < IEEE80211_NUM_ACS; ++i) {
if (wfx_tx_queue_get_num_queued(&wvif->wdev->tx_queue[i],
pspoll_mask)) {
wfx_bh_request_tx(wvif->wdev);
return 1;
}
}
return 0;
}
static int wfx_drop_encrypt_data(struct wfx_dev *wdev, struct hif_ind_rx *arg, struct sk_buff *skb)
{
struct ieee80211_hdr *frame = (struct ieee80211_hdr *) skb->data;
size_t hdrlen = ieee80211_hdrlen(frame->frame_control);
size_t iv_len, icv_len;
/* Oops... There is no fast way to ask mac80211 about
* IV/ICV lengths. Even defineas are not exposed.
*/
switch (arg->rx_flags.encryp) {
case HIF_RI_FLAGS_WEP_ENCRYPTED:
iv_len = 4 /* WEP_IV_LEN */;
icv_len = 4 /* WEP_ICV_LEN */;
break;
case HIF_RI_FLAGS_TKIP_ENCRYPTED:
iv_len = 8 /* TKIP_IV_LEN */;
icv_len = 4 /* TKIP_ICV_LEN */
+ 8 /*MICHAEL_MIC_LEN*/;
break;
case HIF_RI_FLAGS_AES_ENCRYPTED:
iv_len = 8 /* CCMP_HDR_LEN */;
icv_len = 8 /* CCMP_MIC_LEN */;
break;
case HIF_RI_FLAGS_WAPI_ENCRYPTED:
iv_len = 18 /* WAPI_HDR_LEN */;
icv_len = 16 /* WAPI_MIC_LEN */;
break;
default:
dev_err(wdev->dev, "unknown encryption type %d\n",
arg->rx_flags.encryp);
return -EIO;
}
/* Firmware strips ICV in case of MIC failure. */
if (arg->status == HIF_STATUS_MICFAILURE)
icv_len = 0;
if (skb->len < hdrlen + iv_len + icv_len) {
dev_warn(wdev->dev, "malformed SDU received\n");
return -EIO;
}
/* Remove IV, ICV and MIC */
skb_trim(skb, skb->len - icv_len);
memmove(skb->data + iv_len, skb->data, hdrlen);
skb_pull(skb, iv_len);
return 0;
}
void wfx_rx_cb(struct wfx_vif *wvif, struct hif_ind_rx *arg,
struct sk_buff *skb)
{
int link_id = arg->rx_flags.peer_sta_id;
struct ieee80211_rx_status *hdr = IEEE80211_SKB_RXCB(skb);
struct ieee80211_hdr *frame = (struct ieee80211_hdr *)skb->data;
struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)skb->data;
struct wfx_link_entry *entry = NULL;
bool early_data = false;
memset(hdr, 0, sizeof(*hdr));
// FIXME: Why do we drop these frames?
if (!arg->rcpi_rssi &&
(ieee80211_is_probe_resp(frame->frame_control) ||
ieee80211_is_beacon(frame->frame_control)))
goto drop;
if (link_id && link_id <= WFX_MAX_STA_IN_AP_MODE) {
entry = &wvif->link_id_db[link_id - 1];
entry->timestamp = jiffies;
if (entry->status == WFX_LINK_SOFT &&
ieee80211_is_data(frame->frame_control))
early_data = true;
}
if (arg->status == HIF_STATUS_MICFAILURE)
hdr->flag |= RX_FLAG_MMIC_ERROR;
else if (arg->status)
goto drop;
if (skb->len < sizeof(struct ieee80211_pspoll)) {
dev_warn(wvif->wdev->dev, "malformed SDU received\n");
goto drop;
}
if (ieee80211_is_pspoll(frame->frame_control))
if (wfx_handle_pspoll(wvif, skb))
goto drop;
hdr->band = NL80211_BAND_2GHZ;
hdr->freq = ieee80211_channel_to_frequency(arg->channel_number,
hdr->band);
if (arg->rxed_rate >= 14) {
hdr->encoding = RX_ENC_HT;
hdr->rate_idx = arg->rxed_rate - 14;
} else if (arg->rxed_rate >= 4) {
hdr->rate_idx = arg->rxed_rate - 2;
} else {
hdr->rate_idx = arg->rxed_rate;
}
hdr->signal = arg->rcpi_rssi / 2 - 110;
hdr->antenna = 0;
if (arg->rx_flags.encryp) {
if (wfx_drop_encrypt_data(wvif->wdev, arg, skb))
goto drop;
hdr->flag |= RX_FLAG_DECRYPTED | RX_FLAG_IV_STRIPPED;
if (arg->rx_flags.encryp == HIF_RI_FLAGS_TKIP_ENCRYPTED)
hdr->flag |= RX_FLAG_MMIC_STRIPPED;
}
/* Filter block ACK negotiation: fully controlled by firmware */
if (ieee80211_is_action(frame->frame_control) &&
arg->rx_flags.match_uc_addr &&
mgmt->u.action.category == WLAN_CATEGORY_BACK)
goto drop;
if (ieee80211_is_beacon(frame->frame_control) &&
!arg->status && wvif->vif &&
ether_addr_equal(ieee80211_get_SA(frame),
wvif->vif->bss_conf.bssid)) {
const u8 *tim_ie;
u8 *ies = mgmt->u.beacon.variable;
size_t ies_len = skb->len - (ies - skb->data);
tim_ie = cfg80211_find_ie(WLAN_EID_TIM, ies, ies_len);
if (tim_ie) {
struct ieee80211_tim_ie *tim = (struct ieee80211_tim_ie *)&tim_ie[2];
if (wvif->dtim_period != tim->dtim_period) {
wvif->dtim_period = tim->dtim_period;
schedule_work(&wvif->set_beacon_wakeup_period_work);
}
}
/* Disable beacon filter once we're associated... */
if (wvif->disable_beacon_filter &&
(wvif->vif->bss_conf.assoc ||
wvif->vif->bss_conf.ibss_joined)) {
wvif->disable_beacon_filter = false;
schedule_work(&wvif->update_filtering_work);
}
}
if (early_data) {
spin_lock_bh(&wvif->ps_state_lock);
/* Double-check status with lock held */
if (entry->status == WFX_LINK_SOFT)
skb_queue_tail(&entry->rx_queue, skb);
else
ieee80211_rx_irqsafe(wvif->wdev->hw, skb);
spin_unlock_bh(&wvif->ps_state_lock);
} else {
ieee80211_rx_irqsafe(wvif->wdev->hw, skb);
}
return;
drop:
dev_kfree_skb(skb);
}
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