diff options
Diffstat (limited to 'drivers/staging/wfx/data_rx.c')
| -rw-r--r-- | drivers/staging/wfx/data_rx.c | 213 |
1 files changed, 213 insertions, 0 deletions
diff --git a/drivers/staging/wfx/data_rx.c b/drivers/staging/wfx/data_rx.c new file mode 100644 index 000000000000..e7fcce8d0cc4 --- /dev/null +++ b/drivers/staging/wfx/data_rx.c @@ -0,0 +1,213 @@ +// 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); +} |