| /* |
| * Copyright 2002-2005, Instant802 Networks, Inc. |
| * Copyright 2005-2006, Devicescape Software, Inc. |
| * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> |
| * Copyright 2007 Johannes Berg <johannes@sipsolutions.net> |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| */ |
| |
| #include <linux/jiffies.h> |
| #include <linux/kernel.h> |
| #include <linux/skbuff.h> |
| #include <linux/netdevice.h> |
| #include <linux/etherdevice.h> |
| #include <linux/rcupdate.h> |
| #include <net/mac80211.h> |
| #include <net/ieee80211_radiotap.h> |
| |
| #include "ieee80211_i.h" |
| #include "driver-ops.h" |
| #include "led.h" |
| #include "mesh.h" |
| #include "wep.h" |
| #include "wpa.h" |
| #include "tkip.h" |
| #include "wme.h" |
| |
| static u8 ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw, |
| struct tid_ampdu_rx *tid_agg_rx, |
| struct sk_buff *skb, |
| u16 mpdu_seq_num, |
| int bar_req); |
| /* |
| * monitor mode reception |
| * |
| * This function cleans up the SKB, i.e. it removes all the stuff |
| * only useful for monitoring. |
| */ |
| static struct sk_buff *remove_monitor_info(struct ieee80211_local *local, |
| struct sk_buff *skb, |
| int rtap_len) |
| { |
| skb_pull(skb, rtap_len); |
| |
| if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) { |
| if (likely(skb->len > FCS_LEN)) |
| skb_trim(skb, skb->len - FCS_LEN); |
| else { |
| /* driver bug */ |
| WARN_ON(1); |
| dev_kfree_skb(skb); |
| skb = NULL; |
| } |
| } |
| |
| return skb; |
| } |
| |
| static inline int should_drop_frame(struct sk_buff *skb, |
| int present_fcs_len, |
| int radiotap_len) |
| { |
| struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
| struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; |
| |
| if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC)) |
| return 1; |
| if (unlikely(skb->len < 16 + present_fcs_len + radiotap_len)) |
| return 1; |
| if (ieee80211_is_ctl(hdr->frame_control) && |
| !ieee80211_is_pspoll(hdr->frame_control) && |
| !ieee80211_is_back_req(hdr->frame_control)) |
| return 1; |
| return 0; |
| } |
| |
| static int |
| ieee80211_rx_radiotap_len(struct ieee80211_local *local, |
| struct ieee80211_rx_status *status) |
| { |
| int len; |
| |
| /* always present fields */ |
| len = sizeof(struct ieee80211_radiotap_header) + 9; |
| |
| if (status->flag & RX_FLAG_TSFT) |
| len += 8; |
| if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) |
| len += 1; |
| if (local->hw.flags & IEEE80211_HW_NOISE_DBM) |
| len += 1; |
| |
| if (len & 1) /* padding for RX_FLAGS if necessary */ |
| len++; |
| |
| /* make sure radiotap starts at a naturally aligned address */ |
| if (len % 8) |
| len = roundup(len, 8); |
| |
| return len; |
| } |
| |
| /* |
| * ieee80211_add_rx_radiotap_header - add radiotap header |
| * |
| * add a radiotap header containing all the fields which the hardware provided. |
| */ |
| static void |
| ieee80211_add_rx_radiotap_header(struct ieee80211_local *local, |
| struct sk_buff *skb, |
| struct ieee80211_rate *rate, |
| int rtap_len) |
| { |
| struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
| struct ieee80211_radiotap_header *rthdr; |
| unsigned char *pos; |
| |
| rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len); |
| memset(rthdr, 0, rtap_len); |
| |
| /* radiotap header, set always present flags */ |
| rthdr->it_present = |
| cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) | |
| (1 << IEEE80211_RADIOTAP_CHANNEL) | |
| (1 << IEEE80211_RADIOTAP_ANTENNA) | |
| (1 << IEEE80211_RADIOTAP_RX_FLAGS)); |
| rthdr->it_len = cpu_to_le16(rtap_len); |
| |
| pos = (unsigned char *)(rthdr+1); |
| |
| /* the order of the following fields is important */ |
| |
| /* IEEE80211_RADIOTAP_TSFT */ |
| if (status->flag & RX_FLAG_TSFT) { |
| *(__le64 *)pos = cpu_to_le64(status->mactime); |
| rthdr->it_present |= |
| cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT); |
| pos += 8; |
| } |
| |
| /* IEEE80211_RADIOTAP_FLAGS */ |
| if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) |
| *pos |= IEEE80211_RADIOTAP_F_FCS; |
| if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC)) |
| *pos |= IEEE80211_RADIOTAP_F_BADFCS; |
| if (status->flag & RX_FLAG_SHORTPRE) |
| *pos |= IEEE80211_RADIOTAP_F_SHORTPRE; |
| pos++; |
| |
| /* IEEE80211_RADIOTAP_RATE */ |
| if (status->flag & RX_FLAG_HT) { |
| /* |
| * TODO: add following information into radiotap header once |
| * suitable fields are defined for it: |
| * - MCS index (status->rate_idx) |
| * - HT40 (status->flag & RX_FLAG_40MHZ) |
| * - short-GI (status->flag & RX_FLAG_SHORT_GI) |
| */ |
| *pos = 0; |
| } else { |
| rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE); |
| *pos = rate->bitrate / 5; |
| } |
| pos++; |
| |
| /* IEEE80211_RADIOTAP_CHANNEL */ |
| *(__le16 *)pos = cpu_to_le16(status->freq); |
| pos += 2; |
| if (status->band == IEEE80211_BAND_5GHZ) |
| *(__le16 *)pos = cpu_to_le16(IEEE80211_CHAN_OFDM | |
| IEEE80211_CHAN_5GHZ); |
| else if (rate->flags & IEEE80211_RATE_ERP_G) |
| *(__le16 *)pos = cpu_to_le16(IEEE80211_CHAN_OFDM | |
| IEEE80211_CHAN_2GHZ); |
| else |
| *(__le16 *)pos = cpu_to_le16(IEEE80211_CHAN_CCK | |
| IEEE80211_CHAN_2GHZ); |
| pos += 2; |
| |
| /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */ |
| if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) { |
| *pos = status->signal; |
| rthdr->it_present |= |
| cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL); |
| pos++; |
| } |
| |
| /* IEEE80211_RADIOTAP_DBM_ANTNOISE */ |
| if (local->hw.flags & IEEE80211_HW_NOISE_DBM) { |
| *pos = status->noise; |
| rthdr->it_present |= |
| cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTNOISE); |
| pos++; |
| } |
| |
| /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */ |
| |
| /* IEEE80211_RADIOTAP_ANTENNA */ |
| *pos = status->antenna; |
| pos++; |
| |
| /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */ |
| |
| /* IEEE80211_RADIOTAP_RX_FLAGS */ |
| /* ensure 2 byte alignment for the 2 byte field as required */ |
| if ((pos - (unsigned char *)rthdr) & 1) |
| pos++; |
| if (status->flag & RX_FLAG_FAILED_PLCP_CRC) |
| *(__le16 *)pos |= cpu_to_le16(IEEE80211_RADIOTAP_F_RX_BADPLCP); |
| pos += 2; |
| } |
| |
| /* |
| * 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; |
| int needed_headroom = 0; |
| struct sk_buff *skb, *skb2; |
| struct net_device *prev_dev = NULL; |
| int present_fcs_len = 0; |
| int rtap_len = 0; |
| |
| /* |
| * 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_RADIOTAP) |
| rtap_len = ieee80211_get_radiotap_len(origskb->data); |
| else |
| /* room for the radiotap header based on driver features */ |
| needed_headroom = ieee80211_rx_radiotap_len(local, status); |
| |
| if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) |
| present_fcs_len = FCS_LEN; |
| |
| if (!local->monitors) { |
| if (should_drop_frame(origskb, present_fcs_len, rtap_len)) { |
| dev_kfree_skb(origskb); |
| return NULL; |
| } |
| |
| return remove_monitor_info(local, origskb, rtap_len); |
| } |
| |
| if (should_drop_frame(origskb, present_fcs_len, rtap_len)) { |
| /* 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); |
| |
| origskb = remove_monitor_info(local, origskb, rtap_len); |
| |
| if (!skb) |
| return origskb; |
| } |
| |
| /* if necessary, prepend radiotap information */ |
| if (!(status->flag & RX_FLAG_RADIOTAP)) |
| ieee80211_add_rx_radiotap_header(local, skb, rate, |
| needed_headroom); |
| |
| 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 (!netif_running(sdata->dev)) |
| continue; |
| |
| if (sdata->vif.type != NL80211_IFTYPE_MONITOR) |
| continue; |
| |
| if (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_rx(skb2); |
| } |
| } |
| |
| prev_dev = sdata->dev; |
| sdata->dev->stats.rx_packets++; |
| sdata->dev->stats.rx_bytes += skb->len; |
| } |
| |
| if (prev_dev) { |
| skb->dev = prev_dev; |
| netif_rx(skb); |
| } else |
| dev_kfree_skb(skb); |
| |
| return origskb; |
| } |
| |
| |
| static void ieee80211_parse_qos(struct ieee80211_rx_data *rx) |
| { |
| struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
| int tid; |
| |
| /* 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_CONTROL_A_MSDU_PRESENT) |
| rx->flags |= IEEE80211_RX_AMSDU; |
| else |
| rx->flags &= ~IEEE80211_RX_AMSDU; |
| } 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. |
| */ |
| tid = NUM_RX_DATA_QUEUES - 1; |
| } |
| |
| rx->queue = tid; |
| /* 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). |
| * |
| * 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 inbetween 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) |
| { |
| struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
| int hdrlen; |
| |
| #ifndef CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT |
| return; |
| #endif |
| |
| if (WARN_ONCE((unsigned long)rx->skb->data & 1, |
| "unaligned packet at 0x%p\n", rx->skb->data)) |
| return; |
| |
| if (!ieee80211_is_data_present(hdr->frame_control)) |
| return; |
| |
| hdrlen = ieee80211_hdrlen(hdr->frame_control); |
| if (rx->flags & IEEE80211_RX_AMSDU) |
| hdrlen += ETH_HLEN; |
| WARN_ONCE(((unsigned long)(rx->skb->data + hdrlen)) & 3, |
| "unaligned IP payload at 0x%p\n", rx->skb->data + hdrlen); |
| } |
| |
| |
| /* rx handlers */ |
| |
| static ieee80211_rx_result debug_noinline |
| ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx) |
| { |
| struct ieee80211_local *local = rx->local; |
| struct sk_buff *skb = rx->skb; |
| |
| if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning))) |
| return ieee80211_scan_rx(rx->sdata, skb); |
| |
| if (unlikely(test_bit(SCAN_SW_SCANNING, &local->scanning) && |
| (rx->flags & IEEE80211_RX_IN_SCAN))) { |
| /* drop all the other packets during a software scan anyway */ |
| if (ieee80211_scan_rx(rx->sdata, skb) != RX_QUEUED) |
| dev_kfree_skb(skb); |
| return RX_QUEUED; |
| } |
| |
| if (unlikely(rx->flags & IEEE80211_RX_IN_SCAN)) { |
| /* scanning finished during invoking of handlers */ |
| I802_DEBUG_INC(local->rx_handlers_drop_passive_scan); |
| return RX_DROP_UNUSABLE; |
| } |
| |
| return RX_CONTINUE; |
| } |
| |
| |
| static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb) |
| { |
| struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; |
| |
| if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1)) |
| return 0; |
| |
| return ieee80211_is_robust_mgmt_frame(hdr); |
| } |
| |
| |
| static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb) |
| { |
| struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; |
| |
| if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1)) |
| return 0; |
| |
| return ieee80211_is_robust_mgmt_frame(hdr); |
| } |
| |
| |
| /* 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; |
| |
| if (skb->len < 24 + sizeof(*mmie) || |
| !is_multicast_ether_addr(hdr->da)) |
| return -1; |
| |
| if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr)) |
| 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 -1; |
| |
| return le16_to_cpu(mmie->key_id); |
| } |
| |
| |
| static ieee80211_rx_result |
| ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx) |
| { |
| struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
| unsigned int hdrlen = ieee80211_hdrlen(hdr->frame_control); |
| char *dev_addr = rx->dev->dev_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 (memcmp(hdr->addr3, dev_addr, ETH_ALEN) == 0) |
| return RX_DROP_MONITOR; |
| } else { |
| if (!ieee80211_has_a4(hdr->frame_control)) |
| return RX_DROP_MONITOR; |
| if (memcmp(hdr->addr4, dev_addr, ETH_ALEN) == 0) |
| 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) != PLINK_ESTAB) { |
| struct ieee80211_mgmt *mgmt; |
| |
| if (!ieee80211_is_mgmt(hdr->frame_control)) |
| return RX_DROP_MONITOR; |
| |
| if (ieee80211_is_action(hdr->frame_control)) { |
| mgmt = (struct ieee80211_mgmt *)hdr; |
| if (mgmt->u.action.category != PLINK_CATEGORY) |
| 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)) |
| return RX_CONTINUE; |
| |
| return RX_DROP_MONITOR; |
| |
| } |
| |
| #define msh_h_get(h, l) ((struct ieee80211s_hdr *) ((u8 *)h + l)) |
| |
| if (ieee80211_is_data(hdr->frame_control) && |
| is_multicast_ether_addr(hdr->addr1) && |
| mesh_rmc_check(hdr->addr3, msh_h_get(hdr, hdrlen), rx->sdata)) |
| return RX_DROP_MONITOR; |
| #undef msh_h_get |
| |
| 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 duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */ |
| if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) { |
| if (unlikely(ieee80211_has_retry(hdr->frame_control) && |
| rx->sta->last_seq_ctrl[rx->queue] == |
| hdr->seq_ctrl)) { |
| if (rx->flags & IEEE80211_RX_RA_MATCH) { |
| rx->local->dot11FrameDuplicateCount++; |
| rx->sta->num_duplicates++; |
| } |
| return RX_DROP_MONITOR; |
| } else |
| rx->sta->last_seq_ctrl[rx->queue] = hdr->seq_ctrl; |
| } |
| |
| if (unlikely(rx->skb->len < 16)) { |
| I802_DEBUG_INC(rx->local->rx_handlers_drop_short); |
| return RX_DROP_MONITOR; |
| } |
| |
| /* 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->sta || !test_sta_flags(rx->sta, WLAN_STA_ASSOC)))) { |
| if ((!ieee80211_has_fromds(hdr->frame_control) && |
| !ieee80211_has_tods(hdr->frame_control) && |
| ieee80211_is_data(hdr->frame_control)) || |
| !(rx->flags & IEEE80211_RX_RA_MATCH)) { |
| /* Drop IBSS frames and frames for other hosts |
| * silently. */ |
| return RX_DROP_MONITOR; |
| } |
| |
| return RX_DROP_MONITOR; |
| } |
| |
| return RX_CONTINUE; |
| } |
| |
| |
| static ieee80211_rx_result debug_noinline |
| ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx) |
| { |
| struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
| int keyidx; |
| int hdrlen; |
| ieee80211_rx_result result = RX_DROP_UNUSABLE; |
| struct ieee80211_key *stakey = NULL; |
| int mmie_keyidx = -1; |
| |
| /* |
| * Key selection 101 |
| * |
| * There are four types of keys: |
| * - GTK (group keys) |
| * - IGTK (group keys for management 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 and IGTKs. |
| * 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. |
| */ |
| |
| /* |
| * No point in finding a key and decrypting if the frame is neither |
| * addressed to us nor a multicast frame. |
| */ |
| if (!(rx->flags & IEEE80211_RX_RA_MATCH)) |
| return RX_CONTINUE; |
| |
| if (rx->sta) |
| stakey = rcu_dereference(rx->sta->key); |
| |
| if (!ieee80211_has_protected(hdr->frame_control)) |
| mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb); |
| |
| if (!is_multicast_ether_addr(hdr->addr1) && stakey) { |
| rx->key = stakey; |
| /* Skip decryption if the frame is not protected. */ |
| if (!ieee80211_has_protected(hdr->frame_control)) |
| return RX_CONTINUE; |
| } else if (mmie_keyidx >= 0) { |
| /* Broadcast/multicast robust management frame / BIP */ |
| if ((rx->status->flag & RX_FLAG_DECRYPTED) && |
| (rx->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 */ |
| rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]); |
| } else if (!ieee80211_has_protected(hdr->frame_control)) { |
| /* |
| * 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; |
| if (ieee80211_is_mgmt(hdr->frame_control) && |
| is_multicast_ether_addr(hdr->addr1) && |
| (key = rcu_dereference(rx->sdata->default_mgmt_key))) |
| rx->key = key; |
| else if ((key = rcu_dereference(rx->sdata->default_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 ((rx->status->flag & RX_FLAG_DECRYPTED) && |
| (rx->status->flag & RX_FLAG_IV_STRIPPED)) |
| return RX_CONTINUE; |
| |
| hdrlen = ieee80211_hdrlen(hdr->frame_control); |
| |
| if (rx->skb->len < 8 + hdrlen) |
| return RX_DROP_UNUSABLE; /* TODO: count this? */ |
| |
| /* |
| * no need to call ieee80211_wep_get_keyidx, |
| * it verifies a bunch of things we've done already |
| */ |
| keyidx = rx->skb->data[hdrlen + 3] >> 6; |
| |
| 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.alg != ALG_WEP && |
| !is_multicast_ether_addr(hdr->addr1)) |
| rx->key = NULL; |
| } |
| |
| if (rx->key) { |
| rx->key->tx_rx_count++; |
| /* TODO: add threshold stuff again */ |
| } else { |
| return RX_DROP_MONITOR; |
| } |
| |
| /* Check for weak IVs if possible */ |
| if (rx->sta && rx->key->conf.alg == ALG_WEP && |
| ieee80211_is_data(hdr->frame_control) && |
| (!(rx->status->flag & RX_FLAG_IV_STRIPPED) || |
| !(rx->status->flag & RX_FLAG_DECRYPTED)) && |
| ieee80211_wep_is_weak_iv(rx->skb, rx->key)) |
| rx->sta->wep_weak_iv_count++; |
| |
| switch (rx->key->conf.alg) { |
| case ALG_WEP: |
| result = ieee80211_crypto_wep_decrypt(rx); |
| break; |
| case ALG_TKIP: |
| result = ieee80211_crypto_tkip_decrypt(rx); |
| break; |
| case ALG_CCMP: |
| result = ieee80211_crypto_ccmp_decrypt(rx); |
| break; |
| case ALG_AES_CMAC: |
| result = ieee80211_crypto_aes_cmac_decrypt(rx); |
| break; |
| } |
| |
| /* either the frame has been decrypted or will be dropped */ |
| rx->status->flag |= RX_FLAG_DECRYPTED; |
| |
| return result; |
| } |
| |
| 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 ap_sta_ps_start(struct sta_info *sta) |
| { |
| struct ieee80211_sub_if_data *sdata = sta->sdata; |
| struct ieee80211_local *local = sdata->local; |
| |
| atomic_inc(&sdata->bss->num_sta_ps); |
| set_sta_flags(sta, WLAN_STA_PS); |
| drv_sta_notify(local, &sdata->vif, STA_NOTIFY_SLEEP, &sta->sta); |
| #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
| printk(KERN_DEBUG "%s: STA %pM aid %d enters power save mode\n", |
| sdata->dev->name, sta->sta.addr, sta->sta.aid); |
| #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
| } |
| |
| static int ap_sta_ps_end(struct sta_info *sta) |
| { |
| struct ieee80211_sub_if_data *sdata = sta->sdata; |
| struct ieee80211_local *local = sdata->local; |
| int sent, buffered; |
| |
| atomic_dec(&sdata->bss->num_sta_ps); |
| |
| clear_sta_flags(sta, WLAN_STA_PS); |
| drv_sta_notify(local, &sdata->vif, STA_NOTIFY_AWAKE, &sta->sta); |
| |
| if (!skb_queue_empty(&sta->ps_tx_buf)) |
| sta_info_clear_tim_bit(sta); |
| |
| #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
| printk(KERN_DEBUG "%s: STA %pM aid %d exits power save mode\n", |
| sdata->dev->name, sta->sta.addr, sta->sta.aid); |
| #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
| |
| /* Send all buffered frames to the station */ |
| sent = ieee80211_add_pending_skbs(local, &sta->tx_filtered); |
| buffered = ieee80211_add_pending_skbs(local, &sta->ps_tx_buf); |
| sent += buffered; |
| local->total_ps_buffered -= buffered; |
| |
| #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
| printk(KERN_DEBUG "%s: STA %pM aid %d sending %d filtered/%d PS frames " |
| "since STA not sleeping anymore\n", sdata->dev->name, |
| sta->sta.addr, sta->sta.aid, sent - buffered, buffered); |
| #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
| |
| return sent; |
| } |
| |
| static ieee80211_rx_result debug_noinline |
| ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx) |
| { |
| struct sta_info *sta = rx->sta; |
| struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
| |
| if (!sta) |
| return RX_CONTINUE; |
| |
| /* |
| * Update last_rx only for IBSS packets which are for the current |
| * BSSID to avoid keeping the current IBSS network alive in cases |
| * where other STAs start using different BSSID. |
| */ |
| if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) { |
| u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len, |
| NL80211_IFTYPE_ADHOC); |
| if (compare_ether_addr(bssid, rx->sdata->u.ibss.bssid) == 0) |
| sta->last_rx = jiffies; |
| } else if (!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->last_rx = jiffies; |
| } |
| |
| if (!(rx->flags & IEEE80211_RX_RA_MATCH)) |
| return RX_CONTINUE; |
| |
| if (rx->sdata->vif.type == NL80211_IFTYPE_STATION) |
| ieee80211_sta_rx_notify(rx->sdata, hdr); |
| |
| sta->rx_fragments++; |
| sta->rx_bytes += rx->skb->len; |
| sta->last_signal = rx->status->signal; |
| sta->last_qual = rx->status->qual; |
| sta->last_noise = rx->status->noise; |
| |
| /* |
| * Change STA power saving mode only at the end of a frame |
| * exchange sequence. |
| */ |
| if (!ieee80211_has_morefrags(hdr->frame_control) && |
| (rx->sdata->vif.type == NL80211_IFTYPE_AP || |
| rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) { |
| if (test_sta_flags(sta, WLAN_STA_PS)) { |
| /* |
| * Ignore doze->wake transitions that are |
| * indicated by non-data frames, the standard |
| * is unclear here, but for example going to |
| * PS mode and then scanning would cause a |
| * doze->wake transition for the probe request, |
| * and that is clearly undesirable. |
| */ |
| if (ieee80211_is_data(hdr->frame_control) && |
| !ieee80211_has_pm(hdr->frame_control)) |
| rx->sent_ps_buffered += ap_sta_ps_end(sta); |
| } else { |
| if (ieee80211_has_pm(hdr->frame_control)) |
| ap_sta_ps_start(sta); |
| } |
| } |
| |
| /* Drop data::nullfunc frames silently, since they are used only to |
| * control station power saving mode. */ |
| if (ieee80211_is_nullfunc(hdr->frame_control)) { |
| I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc); |
| /* Update counter and free packet here to avoid counting this |
| * as a dropped packed. */ |
| sta->rx_packets++; |
| dev_kfree_skb(rx->skb); |
| return RX_QUEUED; |
| } |
| |
| return RX_CONTINUE; |
| } /* ieee80211_rx_h_sta_process */ |
| |
| static inline struct ieee80211_fragment_entry * |
| ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata, |
| unsigned int frag, unsigned int seq, int rx_queue, |
| struct sk_buff **skb) |
| { |
| struct ieee80211_fragment_entry *entry; |
| int idx; |
| |
| idx = sdata->fragment_next; |
| entry = &sdata->fragments[sdata->fragment_next++]; |
| if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX) |
| sdata->fragment_next = 0; |
| |
| if (!skb_queue_empty(&entry->skb_list)) { |
| #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
| struct ieee80211_hdr *hdr = |
| (struct ieee80211_hdr *) entry->skb_list.next->data; |
| printk(KERN_DEBUG "%s: RX reassembly removed oldest " |
| "fragment entry (idx=%d age=%lu seq=%d last_frag=%d " |
| "addr1=%pM addr2=%pM\n", |
| sdata->dev->name, idx, |
| jiffies - entry->first_frag_time, entry->seq, |
| entry->last_frag, hdr->addr1, hdr->addr2); |
| #endif |
| __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->ccmp = 0; |
| entry->extra_len = 0; |
| |
| return entry; |
| } |
| |
| static inline struct ieee80211_fragment_entry * |
| ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata, |
| unsigned int frag, unsigned int seq, |
| int rx_queue, struct ieee80211_hdr *hdr) |
| { |
| struct ieee80211_fragment_entry *entry; |
| int i, idx; |
| |
| idx = sdata->fragment_next; |
| for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) { |
| struct ieee80211_hdr *f_hdr; |
| |
| idx--; |
| if (idx < 0) |
| idx = IEEE80211_FRAGMENT_MAX - 1; |
| |
| entry = &sdata->fragments[idx]; |
| if (skb_queue_empty(&entry->skb_list) || entry->seq != seq || |
| entry->rx_queue != rx_queue || |
| entry->last_frag + 1 != frag) |
| continue; |
| |
| f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->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)) || |
| compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 || |
| compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0) |
| continue; |
| |
| if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) { |
| __skb_queue_purge(&entry->skb_list); |
| continue; |
| } |
| return entry; |
| } |
| |
| return NULL; |
| } |
| |
| static ieee80211_rx_result debug_noinline |
| ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx) |
| { |
| struct ieee80211_hdr *hdr; |
| u16 sc; |
| __le16 fc; |
| unsigned int frag, seq; |
| struct ieee80211_fragment_entry *entry; |
| struct sk_buff *skb; |
| |
| hdr = (struct ieee80211_hdr *)rx->skb->data; |
| fc = hdr->frame_control; |
| sc = le16_to_cpu(hdr->seq_ctrl); |
| frag = sc & IEEE80211_SCTL_FRAG; |
| |
| if (likely((!ieee80211_has_morefrags(fc) && frag == 0) || |
| (rx->skb)->len < 24 || |
| is_multicast_ether_addr(hdr->addr1))) { |
| /* not fragmented */ |
| goto out; |
| } |
| I802_DEBUG_INC(rx->local->rx_handlers_fragments); |
| |
| seq = (sc & IEEE80211_SCTL_SEQ) >> 4; |
| |
| if (frag == 0) { |
| /* This is the first fragment of a new frame. */ |
| entry = ieee80211_reassemble_add(rx->sdata, frag, seq, |
| rx->queue, &(rx->skb)); |
| if (rx->key && rx->key->conf.alg == ALG_CCMP && |
| ieee80211_has_protected(fc)) { |
| /* Store CCMP PN so that we can verify that the next |
| * fragment has a sequential PN value. */ |
| entry->ccmp = 1; |
| memcpy(entry->last_pn, |
| rx->key->u.ccmp.rx_pn[rx->queue], |
| CCMP_PN_LEN); |
| } |
| 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(rx->sdata, frag, seq, rx->queue, hdr); |
| if (!entry) { |
| I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); |
| return RX_DROP_MONITOR; |
| } |
| |
| /* Verify that MPDUs within one MSDU have sequential PN values. |
| * (IEEE 802.11i, 8.3.3.4.5) */ |
| if (entry->ccmp) { |
| int i; |
| u8 pn[CCMP_PN_LEN], *rpn; |
| if (!rx->key || rx->key->conf.alg != ALG_CCMP) |
| return RX_DROP_UNUSABLE; |
| memcpy(pn, entry->last_pn, CCMP_PN_LEN); |
| for (i = CCMP_PN_LEN - 1; i >= 0; i--) { |
| pn[i]++; |
| if (pn[i]) |
| break; |
| } |
| rpn = rx->key->u.ccmp.rx_pn[rx->queue]; |
| if (memcmp(pn, rpn, CCMP_PN_LEN)) |
| return RX_DROP_UNUSABLE; |
| memcpy(entry->last_pn, pn, CCMP_PN_LEN); |
| } |
| |
| 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_head2); |
| 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))) { |
| memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len); |
| dev_kfree_skb(skb); |
| } |
| |
| /* Complete frame has been reassembled - process it now */ |
| rx->flags |= IEEE80211_RX_FRAGMENTED; |
| |
| out: |
| if (rx->sta) |
| rx->sta->rx_packets++; |
| if (is_multicast_ether_addr(hdr->addr1)) |
| rx->local->dot11MulticastReceivedFrameCount++; |
| else |
| ieee80211_led_rx(rx->local); |
| return RX_CONTINUE; |
| } |
| |
| static ieee80211_rx_result debug_noinline |
| ieee80211_rx_h_ps_poll(struct ieee80211_rx_data *rx) |
| { |
| struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev); |
| struct sk_buff *skb; |
| int no_pending_pkts; |
| __le16 fc = ((struct ieee80211_hdr *)rx->skb->data)->frame_control; |
| |
| if (likely(!rx->sta || !ieee80211_is_pspoll(fc) || |
| !(rx->flags & IEEE80211_RX_RA_MATCH))) |
| return RX_CONTINUE; |
| |
| if ((sdata->vif.type != NL80211_IFTYPE_AP) && |
| (sdata->vif.type != NL80211_IFTYPE_AP_VLAN)) |
| return RX_DROP_UNUSABLE; |
| |
| skb = skb_dequeue(&rx->sta->tx_filtered); |
| if (!skb) { |
| skb = skb_dequeue(&rx->sta->ps_tx_buf); |
| if (skb) |
| rx->local->total_ps_buffered--; |
| } |
| no_pending_pkts = skb_queue_empty(&rx->sta->tx_filtered) && |
| skb_queue_empty(&rx->sta->ps_tx_buf); |
| |
| if (skb) { |
| struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
| struct ieee80211_hdr *hdr = |
| (struct ieee80211_hdr *) skb->data; |
| |
| /* |
| * Tell TX path to send this frame even though the STA may |
| * still remain is PS mode after this frame exchange. |
| */ |
| info->flags |= IEEE80211_TX_CTL_PSPOLL_RESPONSE; |
| |
| #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
| printk(KERN_DEBUG "STA %pM aid %d: PS Poll (entries after %d)\n", |
| rx->sta->sta.addr, rx->sta->sta.aid, |
| skb_queue_len(&rx->sta->ps_tx_buf)); |
| #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
| |
| /* Use MoreData flag to indicate whether there are more |
| * buffered frames for this STA */ |
| if (no_pending_pkts) |
| hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREDATA); |
| else |
| hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA); |
| |
| ieee80211_add_pending_skb(rx->local, skb); |
| |
| if (no_pending_pkts) |
| sta_info_clear_tim_bit(rx->sta); |
| #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
| } else if (!rx->sent_ps_buffered) { |
| /* |
| * FIXME: This can be the result of a race condition between |
| * us expiring a frame and the station polling for it. |
| * Should we send it a null-func frame indicating we |
| * have nothing buffered for it? |
| */ |
| printk(KERN_DEBUG "%s: STA %pM sent PS Poll even " |
| "though there are no buffered frames for it\n", |
| rx->dev->name, rx->sta->sta.addr); |
| #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
| } |
| |
| /* 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; |
| } |
| |
| static ieee80211_rx_result debug_noinline |
| ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx) |
| { |
| u8 *data = rx->skb->data; |
| struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data; |
| |
| if (!ieee80211_is_data_qos(hdr->frame_control)) |
| return RX_CONTINUE; |
| |
| /* remove the qos control field, update frame type and meta-data */ |
| memmove(data + IEEE80211_QOS_CTL_LEN, data, |
| ieee80211_hdrlen(hdr->frame_control) - IEEE80211_QOS_CTL_LEN); |
| hdr = (struct ieee80211_hdr *)skb_pull(rx->skb, IEEE80211_QOS_CTL_LEN); |
| /* change frame type to non QOS */ |
| hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA); |
| |
| return RX_CONTINUE; |
| } |
| |
| static int |
| ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx) |
| { |
| if (unlikely(!rx->sta || |
| !test_sta_flags(rx->sta, WLAN_STA_AUTHORIZED))) |
| return -EACCES; |
| |
| return 0; |
| } |
| |
| static int |
| ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc) |
| { |
| /* |
| * Pass through unencrypted frames if the hardware has |
| * decrypted them already. |
| */ |
| if (rx->status->flag & RX_FLAG_DECRYPTED) |
| return 0; |
| |
| /* Drop unencrypted frames if key is set. */ |
| if (unlikely(!ieee80211_has_protected(fc) && |
| !ieee80211_is_nullfunc(fc) && |
| ieee80211_is_data(fc) && |
| (rx->key || rx->sdata->drop_unencrypted))) |
| return -EACCES; |
| if (rx->sta && test_sta_flags(rx->sta, WLAN_STA_MFP)) { |
| if (unlikely(ieee80211_is_unicast_robust_mgmt_frame(rx->skb) && |
| rx->key)) |
| 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 && |
| rx->key)) |
| 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( |
| (struct ieee80211_hdr *) rx->skb->data))) |
| return -EACCES; |
| } |
| |
| return 0; |
| } |
| |
| static int |
| __ieee80211_data_to_8023(struct ieee80211_rx_data *rx) |
| { |
| struct net_device *dev = rx->dev; |
| struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); |
| |
| return ieee80211_data_to_8023(rx->skb, dev->dev_addr, sdata->vif.type); |
| } |
| |
| /* |
| * 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. |
| */ |
| if (ehdr->h_proto == htons(ETH_P_PAE) && |
| (compare_ether_addr(ehdr->h_dest, rx->dev->dev_addr) == 0 || |
| compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0)) |
| return true; |
| |
| if (ieee80211_802_1x_port_control(rx) || |
| ieee80211_drop_unencrypted(rx, fc)) |
| return false; |
| |
| return true; |
| } |
| |
| /* |
| * requires that rx->skb is a frame with ethernet header |
| */ |
| static void |
| ieee80211_deliver_skb(struct ieee80211_rx_data *rx) |
| { |
| struct net_device *dev = rx->dev; |
| struct ieee80211_local *local = rx->local; |
| struct sk_buff *skb, *xmit_skb; |
| struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); |
| struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data; |
| struct sta_info *dsta; |
| |
| skb = rx->skb; |
| xmit_skb = NULL; |
| |
| if ((sdata->vif.type == NL80211_IFTYPE_AP || |
| sdata->vif.type == NL80211_IFTYPE_AP_VLAN) && |
| !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) && |
| (rx->flags & IEEE80211_RX_RA_MATCH)) { |
| if (is_multicast_ether_addr(ehdr->h_dest)) { |
| /* |
| * 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_ratelimit()) |
| printk(KERN_DEBUG "%s: failed to clone " |
| "multicast frame\n", dev->name); |
| } else { |
| dsta = sta_info_get(local, skb->data); |
| if (dsta && dsta->sdata->dev == dev) { |
| /* |
| * 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; |
| } |
| } |
| } |
| |
| if (skb) { |
| int align __maybe_unused; |
| |
| #if defined(CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT) || !defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) |
| /* |
| * '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. That also explains the __skb_push() |
| * below. |
| */ |
| 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->len; |
| u8 *new = __skb_push(skb, align); |
| memmove(new, data, len); |
| __skb_trim(skb, len); |
| } |
| } |
| #endif |
| |
| if (skb) { |
| /* deliver to local stack */ |
| skb->protocol = eth_type_trans(skb, dev); |
| memset(skb->cb, 0, sizeof(skb->cb)); |
| netif_rx(skb); |
| } |
| } |
| |
| if (xmit_skb) { |
| /* send to wireless media */ |
| 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) |
| { |
| struct net_device *dev = rx->dev; |
| struct ieee80211_local *local = rx->local; |
| u16 ethertype; |
| u8 *payload; |
| struct sk_buff *skb = rx->skb, *frame = NULL; |
| struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; |
| __le16 fc = hdr->frame_control; |
| const struct ethhdr *eth; |
| int remaining, err; |
| u8 dst[ETH_ALEN]; |
| u8 src[ETH_ALEN]; |
| |
| if (unlikely(!ieee80211_is_data(fc))) |
| return RX_CONTINUE; |
| |
| if (unlikely(!ieee80211_is_data_present(fc))) |
| return RX_DROP_MONITOR; |
| |
| if (!(rx->flags & IEEE80211_RX_AMSDU)) |
| return RX_CONTINUE; |
| |
| err = __ieee80211_data_to_8023(rx); |
| if (unlikely(err)) |
| return RX_DROP_UNUSABLE; |
| |
| skb->dev = dev; |
| |
| dev->stats.rx_packets++; |
| dev->stats.rx_bytes += skb->len; |
| |
| /* skip the wrapping header */ |
| eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr)); |
| if (!eth) |
| return RX_DROP_UNUSABLE; |
| |
| while (skb != frame) { |
| u8 padding; |
| __be16 len = eth->h_proto; |
| unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len); |
| |
| remaining = skb->len; |
| memcpy(dst, eth->h_dest, ETH_ALEN); |
| memcpy(src, eth->h_source, ETH_ALEN); |
| |
| padding = ((4 - subframe_len) & 0x3); |
| /* the last MSDU has no padding */ |
| if (subframe_len > remaining) |
| return RX_DROP_UNUSABLE; |
| |
| skb_pull(skb, sizeof(struct ethhdr)); |
| /* if last subframe reuse skb */ |
| if (remaining <= subframe_len + padding) |
| frame = skb; |
| else { |
| /* |
| * Allocate and reserve two bytes more for payload |
| * alignment since sizeof(struct ethhdr) is 14. |
| */ |
| frame = dev_alloc_skb( |
| ALIGN(local->hw.extra_tx_headroom, 4) + |
| subframe_len + 2); |
| |
| if (frame == NULL) |
| return RX_DROP_UNUSABLE; |
| |
| skb_reserve(frame, |
| ALIGN(local->hw.extra_tx_headroom, 4) + |
| sizeof(struct ethhdr) + 2); |
| memcpy(skb_put(frame, ntohs(len)), skb->data, |
| ntohs(len)); |
| |
| eth = (struct ethhdr *) skb_pull(skb, ntohs(len) + |
| padding); |
| if (!eth) { |
| dev_kfree_skb(frame); |
| return RX_DROP_UNUSABLE; |
| } |
| } |
| |
| skb_reset_network_header(frame); |
| frame->dev = dev; |
| frame->priority = skb->priority; |
| rx->skb = frame; |
| |
| payload = frame->data; |
| ethertype = (payload[6] << 8) | payload[7]; |
| |
| if (likely((compare_ether_addr(payload, rfc1042_header) == 0 && |
| ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) || |
| compare_ether_addr(payload, |
| bridge_tunnel_header) == 0)) { |
| /* remove RFC1042 or Bridge-Tunnel |
| * encapsulation and replace EtherType */ |
| skb_pull(frame, 6); |
| memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN); |
| memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN); |
| } else { |
| memcpy(skb_push(frame, sizeof(__be16)), |
| &len, sizeof(__be16)); |
| memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN); |
| memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN); |
| } |
| |
| if (!ieee80211_frame_allowed(rx, fc)) { |
| if (skb == frame) /* last frame */ |
| return RX_DROP_UNUSABLE; |
| dev_kfree_skb(frame); |
| continue; |
| } |
| |
| ieee80211_deliver_skb(rx); |
| } |
| |
| return RX_QUEUED; |
| } |
| |
| #ifdef CONFIG_MAC80211_MESH |
| static ieee80211_rx_result |
| ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx) |
| { |
| struct ieee80211_hdr *hdr; |
| struct ieee80211s_hdr *mesh_hdr; |
| unsigned int hdrlen; |
| struct sk_buff *skb = rx->skb, *fwd_skb; |
| struct ieee80211_local *local = rx->local; |
| struct ieee80211_sub_if_data *sdata; |
| |
| hdr = (struct ieee80211_hdr *) skb->data; |
| hdrlen = ieee80211_hdrlen(hdr->frame_control); |
| mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen); |
| sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev); |
| |
| if (!ieee80211_is_data(hdr->frame_control)) |
| return RX_CONTINUE; |
| |
| if (!mesh_hdr->ttl) |
| /* illegal frame */ |
| return RX_DROP_MONITOR; |
| |
| if (!is_multicast_ether_addr(hdr->addr1) && |
| (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6)) { |
| struct mesh_path *mppath; |
| |
| rcu_read_lock(); |
| mppath = mpp_path_lookup(mesh_hdr->eaddr2, sdata); |
| if (!mppath) { |
| mpp_path_add(mesh_hdr->eaddr2, hdr->addr4, sdata); |
| } else { |
| spin_lock_bh(&mppath->state_lock); |
| mppath->exp_time = jiffies; |
| if (compare_ether_addr(mppath->mpp, hdr->addr4) != 0) |
| memcpy(mppath->mpp, hdr->addr4, ETH_ALEN); |
| spin_unlock_bh(&mppath->state_lock); |
| } |
| rcu_read_unlock(); |
| } |
| |
| /* Frame has reached destination. Don't forward */ |
| if (!is_multicast_ether_addr(hdr->addr1) && |
| compare_ether_addr(rx->dev->dev_addr, hdr->addr3) == 0) |
| return RX_CONTINUE; |
| |
| mesh_hdr->ttl--; |
| |
| if (rx->flags & IEEE80211_RX_RA_MATCH) { |
| if (!mesh_hdr->ttl) |
| IEEE80211_IFSTA_MESH_CTR_INC(&rx->sdata->u.mesh, |
| dropped_frames_ttl); |
| else { |
| struct ieee80211_hdr *fwd_hdr; |
| struct ieee80211_tx_info *info; |
| |
| fwd_skb = skb_copy(skb, GFP_ATOMIC); |
| |
| if (!fwd_skb && net_ratelimit()) |
| printk(KERN_DEBUG "%s: failed to clone mesh frame\n", |
| rx->dev->name); |
| |
| fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data; |
| memcpy(fwd_hdr->addr2, rx->dev->dev_addr, ETH_ALEN); |
| info = IEEE80211_SKB_CB(fwd_skb); |
| memset(info, 0, sizeof(*info)); |
| info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; |
| info->control.vif = &rx->sdata->vif; |
| ieee80211_select_queue(local, fwd_skb); |
| if (is_multicast_ether_addr(fwd_hdr->addr1)) |
| IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh, |
| fwded_mcast); |
| else { |
| int err; |
| /* |
| * Save TA to addr1 to send TA a path error if a |
| * suitable next hop is not found |
| */ |
| memcpy(fwd_hdr->addr1, fwd_hdr->addr2, |
| ETH_ALEN); |
| err = mesh_nexthop_lookup(fwd_skb, sdata); |
| /* Failed to immediately resolve next hop: |
| * fwded frame was dropped or will be added |
| * later to the pending skb queue. */ |
| if (err) |
| return RX_DROP_MONITOR; |
| |
| IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh, |
| fwded_unicast); |
| } |
| IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh, |
| fwded_frames); |
| ieee80211_add_pending_skb(local, fwd_skb); |
| } |
| } |
| |
| if (is_multicast_ether_addr(hdr->addr1) || |
| rx->dev->flags & IFF_PROMISC) |
| return RX_CONTINUE; |
| else |
| return RX_DROP_MONITOR; |
| } |
| #endif |
| |
| static ieee80211_rx_result debug_noinline |
| ieee80211_rx_h_data(struct ieee80211_rx_data *rx) |
| { |
| struct net_device *dev = rx->dev; |
| struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
| __le16 fc = hdr->frame_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; |
| |
| err = __ieee80211_data_to_8023(rx); |
| if (unlikely(err)) |
| return RX_DROP_UNUSABLE; |
| |
| if (!ieee80211_frame_allowed(rx, fc)) |
| return RX_DROP_MONITOR; |
| |
| rx->skb->dev = dev; |
| |
| dev->stats.rx_packets++; |
| dev->stats.rx_bytes += rx->skb->len; |
| |
| ieee80211_deliver_skb(rx); |
| |
| return RX_QUEUED; |
| } |
| |
| static ieee80211_rx_result debug_noinline |
| ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx) |
| { |
| struct ieee80211_local *local = rx->local; |
| struct ieee80211_hw *hw = &local->hw; |
| 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)) { |
| if (!rx->sta) |
| return RX_CONTINUE; |
| tid = le16_to_cpu(bar->control) >> 12; |
| if (rx->sta->ampdu_mlme.tid_state_rx[tid] |
| != HT_AGG_STATE_OPERATIONAL) |
| return RX_CONTINUE; |
| tid_agg_rx = rx->sta->ampdu_mlme.tid_rx[tid]; |
| |
| start_seq_num = le16_to_cpu(bar->start_seq_num) >> 4; |
| |
| /* reset session timer */ |
| if (tid_agg_rx->timeout) |
| mod_timer(&tid_agg_rx->session_timer, |
| TU_TO_EXP_TIME(tid_agg_rx->timeout)); |
| |
| /* manage reordering buffer according to requested */ |
| /* sequence number */ |
| rcu_read_lock(); |
| ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, NULL, |
| start_seq_num, 1); |
| rcu_read_unlock(); |
| return RX_DROP_UNUSABLE; |
| } |
| |
| return RX_CONTINUE; |
| } |
| |
| 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 (compare_ether_addr(mgmt->da, sdata->dev->dev_addr) != 0) { |
| /* Not to own unicast address */ |
| return; |
| } |
| |
| if (compare_ether_addr(mgmt->sa, sdata->u.mgd.bssid) != 0 || |
| compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid) != 0) { |
| /* 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 = (struct ieee80211_mgmt *) skb_put(skb, 24); |
| memset(resp, 0, 24); |
| memcpy(resp->da, mgmt->sa, ETH_ALEN); |
| memcpy(resp->sa, sdata->dev->dev_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, 1); |
| } |
| |
| 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 = IEEE80211_DEV_TO_SUB_IF(rx->dev); |
| 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; |
| |
| if (!rx->sta) |
| return RX_DROP_MONITOR; |
| |
| if (!(rx->flags & IEEE80211_RX_RA_MATCH)) |
| return RX_DROP_MONITOR; |
| |
| if (ieee80211_drop_unencrypted(rx, mgmt->frame_control)) |
| return RX_DROP_MONITOR; |
| |
| /* all categories we currently handle have action_code */ |
| if (len < IEEE80211_MIN_ACTION_SIZE + 1) |
| return RX_DROP_MONITOR; |
| |
| switch (mgmt->u.action.category) { |
| case WLAN_CATEGORY_BACK: |
| /* |
| * The aggregation code is not prepared to handle |
| * anything but STA/AP due to the BSSID handling; |
| * IBSS could work in the code but isn't supported |
| * by drivers or the standard. |
| */ |
| if (sdata->vif.type != NL80211_IFTYPE_STATION && |
| sdata->vif.type != NL80211_IFTYPE_AP_VLAN && |
| sdata->vif.type != NL80211_IFTYPE_AP) |
| return RX_DROP_MONITOR; |
| |
| 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))) |
| return RX_DROP_MONITOR; |
| ieee80211_process_addba_request(local, rx->sta, mgmt, len); |
| break; |
| case WLAN_ACTION_ADDBA_RESP: |
| if (len < (IEEE80211_MIN_ACTION_SIZE + |
| sizeof(mgmt->u.action.u.addba_resp))) |
| return RX_DROP_MONITOR; |
| ieee80211_process_addba_resp(local, rx->sta, mgmt, len); |
| break; |
| case WLAN_ACTION_DELBA: |
| if (len < (IEEE80211_MIN_ACTION_SIZE + |
| sizeof(mgmt->u.action.u.delba))) |
| return RX_DROP_MONITOR; |
| ieee80211_process_delba(sdata, rx->sta, mgmt, len); |
| break; |
| } |
| break; |
| case WLAN_CATEGORY_SPECTRUM_MGMT: |
| if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ) |
| return RX_DROP_MONITOR; |
| |
| if (sdata->vif.type != NL80211_IFTYPE_STATION) |
| return RX_DROP_MONITOR; |
| |
| switch (mgmt->u.action.u.measurement.action_code) { |
| case WLAN_ACTION_SPCT_MSR_REQ: |
| if (len < (IEEE80211_MIN_ACTION_SIZE + |
| sizeof(mgmt->u.action.u.measurement))) |
| return RX_DROP_MONITOR; |
| ieee80211_process_measurement_req(sdata, mgmt, len); |
| break; |
| case WLAN_ACTION_SPCT_CHL_SWITCH: |
| if (len < (IEEE80211_MIN_ACTION_SIZE + |
| sizeof(mgmt->u.action.u.chan_switch))) |
| return RX_DROP_MONITOR; |
| |
| if (sdata->vif.type != NL80211_IFTYPE_STATION) |
| return RX_DROP_MONITOR; |
| |
| if (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN)) |
| return RX_DROP_MONITOR; |
| |
| return ieee80211_sta_rx_mgmt(sdata, rx->skb); |
| } |
| break; |
| case WLAN_CATEGORY_SA_QUERY: |
| if (len < (IEEE80211_MIN_ACTION_SIZE + |
| sizeof(mgmt->u.action.u.sa_query))) |
| return RX_DROP_MONITOR; |
| switch (mgmt->u.action.u.sa_query.action) { |
| case WLAN_ACTION_SA_QUERY_REQUEST: |
| if (sdata->vif.type != NL80211_IFTYPE_STATION) |
| return RX_DROP_MONITOR; |
| ieee80211_process_sa_query_req(sdata, mgmt, len); |
| break; |
| case WLAN_ACTION_SA_QUERY_RESPONSE: |
| /* |
| * SA Query response is currently only used in AP mode |
| * and it is processed in user space. |
| */ |
| return RX_CONTINUE; |
| } |
| break; |
| default: |
| return RX_CONTINUE; |
| } |
| |
| rx->sta->rx_packets++; |
| dev_kfree_skb(rx->skb); |
| return RX_QUEUED; |
| } |
| |
| static ieee80211_rx_result debug_noinline |
| ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx) |
| { |
| struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev); |
| struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; |
| |
| if (!(rx->flags & IEEE80211_RX_RA_MATCH)) |
| return RX_DROP_MONITOR; |
| |
| if (ieee80211_drop_unencrypted(rx, mgmt->frame_control)) |
| return RX_DROP_MONITOR; |
| |
| if (ieee80211_vif_is_mesh(&sdata->vif)) |
| return ieee80211_mesh_rx_mgmt(sdata, rx->skb); |
| |
| if (sdata->vif.type == NL80211_IFTYPE_ADHOC) |
| return ieee80211_ibss_rx_mgmt(sdata, rx->skb); |
| |
| if (sdata->vif.type == NL80211_IFTYPE_STATION) |
| return ieee80211_sta_rx_mgmt(sdata, rx->skb); |
| |
| return RX_DROP_MONITOR; |
| } |
| |
| static void ieee80211_rx_michael_mic_report(struct ieee80211_hdr *hdr, |
| struct ieee80211_rx_data *rx) |
| { |
| int keyidx; |
| unsigned int hdrlen; |
| |
| hdrlen = ieee80211_hdrlen(hdr->frame_control); |
| if (rx->skb->len >= hdrlen + 4) |
| keyidx = rx->skb->data[hdrlen + 3] >> 6; |
| else |
| keyidx = -1; |
| |
| if (!rx->sta) { |
| /* |
| * Some hardware seem to generate incorrect Michael MIC |
| * reports; ignore them to avoid triggering countermeasures. |
| */ |
| goto ignore; |
| } |
| |
| if (!ieee80211_has_protected(hdr->frame_control)) |
| goto ignore; |
| |
| if (rx->sdata->vif.type == NL80211_IFTYPE_AP && keyidx) { |
| /* |
| * APs with pairwise keys should never receive Michael MIC |
| * errors for non-zero keyidx because these are reserved for |
| * group keys and only the AP is sending real multicast |
| * frames in the BSS. |
| */ |
| goto ignore; |
| } |
| |
| if (!ieee80211_is_data(hdr->frame_control) && |
| !ieee80211_is_auth(hdr->frame_control)) |
| goto ignore; |
| |
| mac80211_ev_michael_mic_failure(rx->sdata, keyidx, hdr, NULL, |
| GFP_ATOMIC); |
| ignore: |
| dev_kfree_skb(rx->skb); |
| rx->skb = NULL; |
| } |
| |
| /* TODO: use IEEE80211_RX_FRAGMENTED */ |
| static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx) |
| { |
| struct ieee80211_sub_if_data *sdata; |
| struct ieee80211_local *local = rx->local; |
| struct ieee80211_rtap_hdr { |
| struct ieee80211_radiotap_header hdr; |
| u8 flags; |
| u8 rate; |
| __le16 chan_freq; |
| __le16 chan_flags; |
| } __attribute__ ((packed)) *rthdr; |
| struct sk_buff *skb = rx->skb, *skb2; |
| struct net_device *prev_dev = NULL; |
| struct ieee80211_rx_status *status = rx->status; |
| |
| if (rx->flags & IEEE80211_RX_CMNTR_REPORTED) |
| goto out_free_skb; |
| |
| if (skb_headroom(skb) < sizeof(*rthdr) && |
| pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC)) |
| goto out_free_skb; |
| |
| rthdr = (void *)skb_push(skb, sizeof(*rthdr)); |
| memset(rthdr, 0, sizeof(*rthdr)); |
| rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr)); |
| rthdr->hdr.it_present = |
| cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) | |
| (1 << IEEE80211_RADIOTAP_RATE) | |
| (1 << IEEE80211_RADIOTAP_CHANNEL)); |
| |
| rthdr->rate = rx->rate->bitrate / 5; |
| rthdr->chan_freq = cpu_to_le16(status->freq); |
| |
| if (status->band == IEEE80211_BAND_5GHZ) |
| rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM | |
| IEEE80211_CHAN_5GHZ); |
| else |
| rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN | |
| IEEE80211_CHAN_2GHZ); |
| |
| skb_set_mac_header(skb, 0); |
| 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 (!netif_running(sdata->dev)) |
| 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_rx(skb2); |
| } |
| } |
| |
| prev_dev = sdata->dev; |
| sdata->dev->stats.rx_packets++; |
| sdata->dev->stats.rx_bytes += skb->len; |
| } |
| |
| if (prev_dev) { |
| skb->dev = prev_dev; |
| netif_rx(skb); |
| skb = NULL; |
| } else |
| goto out_free_skb; |
| |
| rx->flags |= IEEE80211_RX_CMNTR_REPORTED; |
| return; |
| |
| out_free_skb: |
| dev_kfree_skb(skb); |
| } |
| |
| |
| static void ieee80211_invoke_rx_handlers(struct ieee80211_sub_if_data *sdata, |
| struct ieee80211_rx_data *rx, |
| struct sk_buff *skb) |
| { |
| ieee80211_rx_result res = RX_DROP_MONITOR; |
| |
| rx->skb = skb; |
| rx->sdata = sdata; |
| rx->dev = sdata->dev; |
| |
| #define CALL_RXH(rxh) \ |
| do { \ |
| res = rxh(rx); \ |
| if (res != RX_CONTINUE) \ |
| goto rxh_done; \ |
| } while (0); |
| |
| CALL_RXH(ieee80211_rx_h_passive_scan) |
| CALL_RXH(ieee80211_rx_h_check) |
| CALL_RXH(ieee80211_rx_h_decrypt) |
| CALL_RXH(ieee80211_rx_h_check_more_data) |
| CALL_RXH(ieee80211_rx_h_sta_process) |
| CALL_RXH(ieee80211_rx_h_defragment) |
| CALL_RXH(ieee80211_rx_h_ps_poll) |
| CALL_RXH(ieee80211_rx_h_michael_mic_verify) |
| /* must be after MMIC verify so header is counted in MPDU mic */ |
| CALL_RXH(ieee80211_rx_h_remove_qos_control) |
| CALL_RXH(ieee80211_rx_h_amsdu) |
| #ifdef CONFIG_MAC80211_MESH |
| if (ieee80211_vif_is_mesh(&sdata->vif)) |
| CALL_RXH(ieee80211_rx_h_mesh_fwding); |
| #endif |
| CALL_RXH(ieee80211_rx_h_data) |
| CALL_RXH(ieee80211_rx_h_ctrl) |
| CALL_RXH(ieee80211_rx_h_action) |
| CALL_RXH(ieee80211_rx_h_mgmt) |
| |
| #undef CALL_RXH |
| |
| rxh_done: |
| switch (res) { |
| case RX_DROP_MONITOR: |
| I802_DEBUG_INC(sdata->local->rx_handlers_drop); |
| if (rx->sta) |
| rx->sta->rx_dropped++; |
| /* fall through */ |
| case RX_CONTINUE: |
| ieee80211_rx_cooked_monitor(rx); |
| break; |
| case RX_DROP_UNUSABLE: |
| I802_DEBUG_INC(sdata->local->rx_handlers_drop); |
| if (rx->sta) |
| rx->sta->rx_dropped++; |
| dev_kfree_skb(rx->skb); |
| break; |
| case RX_QUEUED: |
| I802_DEBUG_INC(sdata->local->rx_handlers_queued); |
| break; |
| } |
| } |
| |
| /* main receive path */ |
| |
| static int prepare_for_handlers(struct ieee80211_sub_if_data *sdata, |
| struct ieee80211_rx_data *rx, |
| struct ieee80211_hdr *hdr) |
| { |
| u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len, sdata->vif.type); |
| int multicast = is_multicast_ether_addr(hdr->addr1); |
| |
| switch (sdata->vif.type) { |
| case NL80211_IFTYPE_STATION: |
| if (!bssid) |
| return 0; |
| if (!multicast && |
| compare_ether_addr(sdata->dev->dev_addr, hdr->addr1) != 0) { |
| if (!(sdata->dev->flags & IFF_PROMISC)) |
| return 0; |
| rx->flags &= ~IEEE80211_RX_RA_MATCH; |
| } |
| break; |
| case NL80211_IFTYPE_ADHOC: |
| if (!bssid) |
| return 0; |
| if (ieee80211_is_beacon(hdr->frame_control)) { |
| return 1; |
| } |
| else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) { |
| if (!(rx->flags & IEEE80211_RX_IN_SCAN)) |
| return 0; |
| rx->flags &= ~IEEE80211_RX_RA_MATCH; |
| } else if (!multicast && |
| compare_ether_addr(sdata->dev->dev_addr, |
| hdr->addr1) != 0) { |
| if (!(sdata->dev->flags & IFF_PROMISC)) |
| return 0; |
| rx->flags &= ~IEEE80211_RX_RA_MATCH; |
| } else if (!rx->sta) { |
| int rate_idx; |
| if (rx->status->flag & RX_FLAG_HT) |
| rate_idx = 0; /* TODO: HT rates */ |
| else |
| rate_idx = rx->status->rate_idx; |
| rx->sta = ieee80211_ibss_add_sta(sdata, bssid, hdr->addr2, |
| BIT(rate_idx)); |
| } |
| break; |
| case NL80211_IFTYPE_MESH_POINT: |
| if (!multicast && |
| compare_ether_addr(sdata->dev->dev_addr, |
| hdr->addr1) != 0) { |
| if (!(sdata->dev->flags & IFF_PROMISC)) |
| return 0; |
| |
| rx->flags &= ~IEEE80211_RX_RA_MATCH; |
| } |
| break; |
| case NL80211_IFTYPE_AP_VLAN: |
| case NL80211_IFTYPE_AP: |
| if (!bssid) { |
| if (compare_ether_addr(sdata->dev->dev_addr, |
| hdr->addr1)) |
| return 0; |
| } else if (!ieee80211_bssid_match(bssid, |
| sdata->dev->dev_addr)) { |
| if (!(rx->flags & IEEE80211_RX_IN_SCAN)) |
| return 0; |
| rx->flags &= ~IEEE80211_RX_RA_MATCH; |
| } |
| break; |
| case NL80211_IFTYPE_WDS: |
| if (bssid || !ieee80211_is_data(hdr->frame_control)) |
| return 0; |
| if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2)) |
| return 0; |
| break; |
| case NL80211_IFTYPE_MONITOR: |
| /* take everything */ |
| break; |
| case NL80211_IFTYPE_UNSPECIFIED: |
| case __NL80211_IFTYPE_AFTER_LAST: |
| /* should never get here */ |
| WARN_ON(1); |
| break; |
| } |
| |
| return 1; |
| } |
| |
| /* |
| * This is the actual Rx frames handler. as it blongs to Rx path it must |
| * be called with rcu_read_lock protection. |
| */ |
| static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw, |
| struct sk_buff *skb, |
| struct ieee80211_rate *rate) |
| { |
| struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
| struct ieee80211_local *local = hw_to_local(hw); |
| struct ieee80211_sub_if_data *sdata; |
| struct ieee80211_hdr *hdr; |
| struct ieee80211_rx_data rx; |
| int prepares; |
| struct ieee80211_sub_if_data *prev = NULL; |
| struct sk_buff *skb_new; |
| |
| hdr = (struct ieee80211_hdr *)skb->data; |
| memset(&rx, 0, sizeof(rx)); |
| rx.skb = skb; |
| rx.local = local; |
| |
| rx.status = status; |
| rx.rate = rate; |
| |
| if (ieee80211_is_data(hdr->frame_control) || ieee80211_is_mgmt(hdr->frame_control)) |
| local->dot11ReceivedFragmentCount++; |
| |
| rx.sta = sta_info_get(local, hdr->addr2); |
| if (rx.sta) { |
| rx.sdata = rx.sta->sdata; |
| rx.dev = rx.sta->sdata->dev; |
| } |
| |
| if ((status->flag & RX_FLAG_MMIC_ERROR)) { |
| ieee80211_rx_michael_mic_report(hdr, &rx); |
| return; |
| } |
| |
| if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning) || |
| test_bit(SCAN_OFF_CHANNEL, &local->scanning))) |
| rx.flags |= IEEE80211_RX_IN_SCAN; |
| |
| ieee80211_parse_qos(&rx); |
| ieee80211_verify_alignment(&rx); |
| |
| skb = rx.skb; |
| |
| if (rx.sdata && ieee80211_is_data(hdr->frame_control)) { |
| rx.flags |= IEEE80211_RX_RA_MATCH; |
| prepares = prepare_for_handlers(rx.sdata, &rx, hdr); |
| if (prepares) |
| prev = rx.sdata; |
| } else list_for_each_entry_rcu(sdata, &local->interfaces, list) { |
| if (!netif_running(sdata->dev)) |
| continue; |
| |
| if (sdata->vif.type == NL80211_IFTYPE_MONITOR || |
| sdata->vif.type == NL80211_IFTYPE_AP_VLAN) |
| continue; |
| |
| rx.flags |= IEEE80211_RX_RA_MATCH; |
| prepares = prepare_for_handlers(sdata, &rx, hdr); |
| |
| if (!prepares) |
| 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; |
| } |
| |
| /* |
| * frame was destined for the previous interface |
| * so invoke RX handlers for it |
| */ |
| |
| skb_new = skb_copy(skb, GFP_ATOMIC); |
| if (!skb_new) { |
| if (net_ratelimit()) |
| printk(KERN_DEBUG "%s: failed to copy " |
| "multicast frame for %s\n", |
| wiphy_name(local->hw.wiphy), |
| prev->dev->name); |
| continue; |
| } |
| ieee80211_invoke_rx_handlers(prev, &rx, skb_new); |
| prev = sdata; |
| } |
| if (prev) |
| ieee80211_invoke_rx_handlers(prev, &rx, skb); |
| else |
| dev_kfree_skb(skb); |
| } |
| |
| #define SEQ_MODULO 0x1000 |
| #define SEQ_MASK 0xfff |
| |
| static inline int seq_less(u16 sq1, u16 sq2) |
| { |
| return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1); |
| } |
| |
| static inline u16 seq_inc(u16 sq) |
| { |
| return (sq + 1) & SEQ_MASK; |
| } |
| |
| static inline u16 seq_sub(u16 sq1, u16 sq2) |
| { |
| return (sq1 - sq2) & SEQ_MASK; |
| } |
| |
| |
| static void ieee80211_release_reorder_frame(struct ieee80211_hw *hw, |
| struct tid_ampdu_rx *tid_agg_rx, |
| int index) |
| { |
| struct ieee80211_supported_band *sband; |
| struct ieee80211_rate *rate; |
| struct sk_buff *skb = tid_agg_rx->reorder_buf[index]; |
| struct ieee80211_rx_status *status; |
| |
| if (!skb) |
| goto no_frame; |
| |
| status = IEEE80211_SKB_RXCB(skb); |
| |
| /* release the reordered frames to stack */ |
| sband = hw->wiphy->bands[status->band]; |
| if (status->flag & RX_FLAG_HT) |
| rate = sband->bitrates; /* TODO: HT rates */ |
| else |
| rate = &sband->bitrates[status->rate_idx]; |
| __ieee80211_rx_handle_packet(hw, skb, rate); |
| tid_agg_rx->stored_mpdu_num--; |
| tid_agg_rx->reorder_buf[index] = NULL; |
| |
| no_frame: |
| tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num); |
| } |
| |
| |
| /* |
| * 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. |
| */ |
| #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10) |
| |
| /* |
| * As it function blongs to Rx path it must be called with |
| * the proper rcu_read_lock protection for its flow. |
| */ |
| static u8 ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw, |
| struct tid_ampdu_rx *tid_agg_rx, |
| struct sk_buff *skb, |
| u16 mpdu_seq_num, |
| int bar_req) |
| { |
| u16 head_seq_num, buf_size; |
| int index; |
| |
| buf_size = tid_agg_rx->buf_size; |
| head_seq_num = tid_agg_rx->head_seq_num; |
| |
| /* frame with out of date sequence number */ |
| if (seq_less(mpdu_seq_num, head_seq_num)) { |
| dev_kfree_skb(skb); |
| return 1; |
| } |
| |
| /* if frame sequence number exceeds our buffering window size or |
| * block Ack Request arrived - release stored frames */ |
| if ((!seq_less(mpdu_seq_num, head_seq_num + buf_size)) || (bar_req)) { |
| /* new head to the ordering buffer */ |
| if (bar_req) |
| head_seq_num = mpdu_seq_num; |
| else |
| head_seq_num = |
| seq_inc(seq_sub(mpdu_seq_num, buf_size)); |
| /* release stored frames up to new head to stack */ |
| while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) { |
| index = seq_sub(tid_agg_rx->head_seq_num, |
| tid_agg_rx->ssn) |
| % tid_agg_rx->buf_size; |
| ieee80211_release_reorder_frame(hw, tid_agg_rx, |
| index); |
| } |
| if (bar_req) |
| return 1; |
| } |
| |
| /* now the new frame is always in the range of the reordering */ |
| /* buffer window */ |
| index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn) |
| % tid_agg_rx->buf_size; |
| /* check if we already stored this frame */ |
| if (tid_agg_rx->reorder_buf[index]) { |
| dev_kfree_skb(skb); |
| return 1; |
| } |
| |
| /* if arrived mpdu is in the right order and nothing else stored */ |
| /* release it immediately */ |
| if (mpdu_seq_num == tid_agg_rx->head_seq_num && |
| tid_agg_rx->stored_mpdu_num == 0) { |
| tid_agg_rx->head_seq_num = |
| seq_inc(tid_agg_rx->head_seq_num); |
| return 0; |
| } |
| |
| /* put the frame in the reordering buffer */ |
| tid_agg_rx->reorder_buf[index] = skb; |
| tid_agg_rx->reorder_time[index] = jiffies; |
| tid_agg_rx->stored_mpdu_num++; |
| /* release the buffer until next missing frame */ |
| index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) |
| % tid_agg_rx->buf_size; |
| if (!tid_agg_rx->reorder_buf[index] && |
| tid_agg_rx->stored_mpdu_num > 1) { |
| /* |
| * No buffers ready to be released, but check whether any |
| * frames in the reorder buffer have timed out. |
| */ |
| int j; |
| int skipped = 1; |
| for (j = (index + 1) % tid_agg_rx->buf_size; j != index; |
| j = (j + 1) % tid_agg_rx->buf_size) { |
| if (tid_agg_rx->reorder_buf[j] == NULL) { |
| skipped++; |
| continue; |
| } |
| if (!time_after(jiffies, tid_agg_rx->reorder_time[j] + |
| HZ / 10)) |
| break; |
| |
| #ifdef CONFIG_MAC80211_HT_DEBUG |
| if (net_ratelimit()) |
| printk(KERN_DEBUG "%s: release an RX reorder " |
| "frame due to timeout on earlier " |
| "frames\n", |
| wiphy_name(hw->wiphy)); |
| #endif |
| ieee80211_release_reorder_frame(hw, tid_agg_rx, j); |
| |
| /* |
| * Increment the head seq# also for the skipped slots. |
| */ |
| tid_agg_rx->head_seq_num = |
| (tid_agg_rx->head_seq_num + skipped) & |
| SEQ_MASK; |
| skipped = 0; |
| } |
| } else while (tid_agg_rx->reorder_buf[index]) { |
| ieee80211_release_reorder_frame(hw, tid_agg_rx, index); |
| index = seq_sub(tid_agg_rx->head_seq_num, |
| tid_agg_rx->ssn) % tid_agg_rx->buf_size; |
| } |
| return 1; |
| } |
| |
| static u8 ieee80211_rx_reorder_ampdu(struct ieee80211_local *local, |
| struct sk_buff *skb) |
| { |
| struct ieee80211_hw *hw = &local->hw; |
| struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; |
| struct sta_info *sta; |
| struct tid_ampdu_rx *tid_agg_rx; |
| u16 sc; |
| u16 mpdu_seq_num; |
| u8 ret = 0; |
| int tid; |
| |
| sta = sta_info_get(local, hdr->addr2); |
| if (!sta) |
| return ret; |
| |
| /* filter the QoS data rx stream according to |
| * STA/TID and check if this STA/TID is on aggregation */ |
| if (!ieee80211_is_data_qos(hdr->frame_control)) |
| goto end_reorder; |
| |
| tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK; |
| |
| if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_OPERATIONAL) |
| goto end_reorder; |
| |
| tid_agg_rx = sta->ampdu_mlme.tid_rx[tid]; |
| |
| /* qos null data frames are excluded */ |
| if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC))) |
| goto end_reorder; |
| |
| /* new un-ordered ampdu frame - process it */ |
| |
| /* reset session timer */ |
| if (tid_agg_rx->timeout) |
| mod_timer(&tid_agg_rx->session_timer, |
| TU_TO_EXP_TIME(tid_agg_rx->timeout)); |
| |
| /* if this mpdu is fragmented - terminate rx aggregation session */ |
| sc = le16_to_cpu(hdr->seq_ctrl); |
| if (sc & IEEE80211_SCTL_FRAG) { |
| ieee80211_sta_stop_rx_ba_session(sta->sdata, sta->sta.addr, |
| tid, 0, WLAN_REASON_QSTA_REQUIRE_SETUP); |
| ret = 1; |
| goto end_reorder; |
| } |
| |
| /* according to mpdu sequence number deal with reordering buffer */ |
| mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4; |
| ret = ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb, |
| mpdu_seq_num, 0); |
| end_reorder: |
| return ret; |
| } |
| |
| /* |
| * 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(struct ieee80211_hw *hw, struct sk_buff *skb) |
| { |
| 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 < 0 || |
| status->band >= IEEE80211_NUM_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; |
| |
| /* |
| * The same happens when we're not even started, |
| * but that's worth a warning. |
| */ |
| if (WARN_ON(!local->started)) |
| goto drop; |
| |
| if (status->flag & RX_FLAG_HT) { |
| /* rate_idx is MCS index */ |
| if (WARN_ON(status->rate_idx < 0 || |
| status->rate_idx >= 76)) |
| goto drop; |
| /* HT rates are not in the table - use the highest legacy rate |
| * for now since other parts of mac80211 may not yet be fully |
| * MCS aware. */ |
| rate = &sband->bitrates[sband->n_bitrates - 1]; |
| } else { |
| if (WARN_ON(status->rate_idx < 0 || |
| status->rate_idx >= sband->n_bitrates)) |
| goto drop; |
| rate = &sband->bitrates[status->rate_idx]; |
| } |
| |
| /* |
| * 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(); |
| |
| /* |
| * 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. |
| */ |
| skb = ieee80211_rx_monitor(local, skb, rate); |
| if (!skb) { |
| rcu_read_unlock(); |
| return; |
| } |
| |
| /* |
| * In theory, the block ack reordering should happen after duplicate |
| * removal (ieee80211_rx_h_check(), which is an RX handler). As such, |
| * the call to ieee80211_rx_reorder_ampdu() should really be moved to |
| * happen as a new RX handler between ieee80211_rx_h_check and |
| * ieee80211_rx_h_decrypt. This cleanup may eventually happen, but for |
| * the time being, the call can be here since RX reorder buf processing |
| * will implicitly skip duplicates. We could, in theory at least, |
| * process frames that ieee80211_rx_h_passive_scan would drop (e.g., |
| * frames from other than operational channel), but that should not |
| * happen in normal networks. |
| */ |
| if (!ieee80211_rx_reorder_ampdu(local, skb)) |
| __ieee80211_rx_handle_packet(hw, skb, rate); |
| |
| rcu_read_unlock(); |
| |
| return; |
| drop: |
| kfree_skb(skb); |
| } |
| EXPORT_SYMBOL(ieee80211_rx); |
| |
| /* 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); |