| /* |
| * Copyright 2002-2005, Instant802 Networks, Inc. |
| * Copyright 2005-2006, Devicescape Software, Inc. |
| * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> |
| * Copyright 2007-2010 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/slab.h> |
| #include <linux/kernel.h> |
| #include <linux/skbuff.h> |
| #include <linux/netdevice.h> |
| #include <linux/etherdevice.h> |
| #include <linux/rcupdate.h> |
| #include <linux/export.h> |
| #include <net/mac80211.h> |
| #include <net/ieee80211_radiotap.h> |
| #include <asm/unaligned.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" |
| #include "rate.h" |
| |
| /* |
| * 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) |
| { |
| struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
| |
| if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) { |
| if (likely(skb->len > FCS_LEN)) |
| __pskb_trim(skb, skb->len - FCS_LEN); |
| else { |
| /* driver bug */ |
| WARN_ON(1); |
| dev_kfree_skb(skb); |
| return NULL; |
| } |
| } |
| |
| if (status->vendor_radiotap_len) |
| __pskb_pull(skb, status->vendor_radiotap_len); |
| |
| return skb; |
| } |
| |
| static inline int should_drop_frame(struct sk_buff *skb, int present_fcs_len) |
| { |
| struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
| struct ieee80211_hdr *hdr; |
| |
| hdr = (void *)(skb->data + status->vendor_radiotap_len); |
| |
| if (status->flag & (RX_FLAG_FAILED_FCS_CRC | |
| RX_FLAG_FAILED_PLCP_CRC | |
| RX_FLAG_AMPDU_IS_ZEROLEN)) |
| return 1; |
| if (unlikely(skb->len < 16 + present_fcs_len + |
| status->vendor_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_space(struct ieee80211_local *local, |
| struct ieee80211_rx_status *status) |
| { |
| int len; |
| |
| /* always present fields */ |
| len = sizeof(struct ieee80211_radiotap_header) + 9; |
| |
| /* allocate extra bitmap */ |
| if (status->vendor_radiotap_len) |
| len += 4; |
| |
| if (ieee80211_have_rx_timestamp(status)) { |
| len = ALIGN(len, 8); |
| len += 8; |
| } |
| if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) |
| len += 1; |
| |
| /* padding for RX_FLAGS if necessary */ |
| len = ALIGN(len, 2); |
| |
| if (status->flag & RX_FLAG_HT) /* HT info */ |
| len += 3; |
| |
| if (status->flag & RX_FLAG_AMPDU_DETAILS) { |
| len = ALIGN(len, 4); |
| len += 8; |
| } |
| |
| if (status->flag & RX_FLAG_VHT) { |
| len = ALIGN(len, 2); |
| len += 12; |
| } |
| |
| if (status->vendor_radiotap_len) { |
| if (WARN_ON_ONCE(status->vendor_radiotap_align == 0)) |
| status->vendor_radiotap_align = 1; |
| /* align standard part of vendor namespace */ |
| len = ALIGN(len, 2); |
| /* allocate standard part of vendor namespace */ |
| len += 6; |
| /* align vendor-defined part */ |
| len = ALIGN(len, status->vendor_radiotap_align); |
| /* vendor-defined part is already in skb */ |
| } |
| |
| 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, bool has_fcs) |
| { |
| struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
| struct ieee80211_radiotap_header *rthdr; |
| unsigned char *pos; |
| u16 rx_flags = 0; |
| int mpdulen; |
| |
| mpdulen = skb->len; |
| if (!(has_fcs && (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS))) |
| mpdulen += FCS_LEN; |
| |
| 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 + status->vendor_radiotap_len); |
| |
| pos = (unsigned char *)(rthdr + 1); |
| |
| if (status->vendor_radiotap_len) { |
| rthdr->it_present |= |
| cpu_to_le32(BIT(IEEE80211_RADIOTAP_VENDOR_NAMESPACE)) | |
| cpu_to_le32(BIT(IEEE80211_RADIOTAP_EXT)); |
| put_unaligned_le32(status->vendor_radiotap_bitmap, pos); |
| pos += 4; |
| } |
| |
| /* the order of the following fields is important */ |
| |
| /* IEEE80211_RADIOTAP_TSFT */ |
| if (ieee80211_have_rx_timestamp(status)) { |
| /* padding */ |
| while ((pos - (u8 *)rthdr) & 7) |
| *pos++ = 0; |
| put_unaligned_le64( |
| ieee80211_calculate_rx_timestamp(local, status, |
| mpdulen, 0), |
| pos); |
| rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT); |
| pos += 8; |
| } |
| |
| /* IEEE80211_RADIOTAP_FLAGS */ |
| if (has_fcs && (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 (!rate || status->flag & (RX_FLAG_HT | RX_FLAG_VHT)) { |
| /* |
| * Without rate information don't add it. If we have, |
| * MCS information is a separate field in radiotap, |
| * added below. The byte here is needed as padding |
| * for the channel though, so initialise it to 0. |
| */ |
| *pos = 0; |
| } else { |
| rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE); |
| *pos = rate->bitrate / 5; |
| } |
| pos++; |
| |
| /* IEEE80211_RADIOTAP_CHANNEL */ |
| put_unaligned_le16(status->freq, pos); |
| pos += 2; |
| if (status->band == IEEE80211_BAND_5GHZ) |
| put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ, |
| pos); |
| else if (status->flag & (RX_FLAG_HT | RX_FLAG_VHT)) |
| put_unaligned_le16(IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ, |
| pos); |
| else if (rate && rate->flags & IEEE80211_RATE_ERP_G) |
| put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ, |
| pos); |
| else if (rate) |
| put_unaligned_le16(IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ, |
| pos); |
| else |
| put_unaligned_le16(IEEE80211_CHAN_2GHZ, pos); |
| pos += 2; |
| |
| /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */ |
| if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM && |
| !(status->flag & RX_FLAG_NO_SIGNAL_VAL)) { |
| *pos = status->signal; |
| rthdr->it_present |= |
| cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL); |
| 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 - (u8 *)rthdr) & 1) |
| *pos++ = 0; |
| if (status->flag & RX_FLAG_FAILED_PLCP_CRC) |
| rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP; |
| put_unaligned_le16(rx_flags, pos); |
| pos += 2; |
| |
| if (status->flag & RX_FLAG_HT) { |
| rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_MCS); |
| *pos++ = local->hw.radiotap_mcs_details; |
| *pos = 0; |
| if (status->flag & RX_FLAG_SHORT_GI) |
| *pos |= IEEE80211_RADIOTAP_MCS_SGI; |
| if (status->flag & RX_FLAG_40MHZ) |
| *pos |= IEEE80211_RADIOTAP_MCS_BW_40; |
| if (status->flag & RX_FLAG_HT_GF) |
| *pos |= IEEE80211_RADIOTAP_MCS_FMT_GF; |
| pos++; |
| *pos++ = status->rate_idx; |
| } |
| |
| if (status->flag & RX_FLAG_AMPDU_DETAILS) { |
| u16 flags = 0; |
| |
| /* ensure 4 byte alignment */ |
| while ((pos - (u8 *)rthdr) & 3) |
| pos++; |
| rthdr->it_present |= |
| cpu_to_le32(1 << IEEE80211_RADIOTAP_AMPDU_STATUS); |
| put_unaligned_le32(status->ampdu_reference, pos); |
| pos += 4; |
| if (status->flag & RX_FLAG_AMPDU_REPORT_ZEROLEN) |
| flags |= IEEE80211_RADIOTAP_AMPDU_REPORT_ZEROLEN; |
| if (status->flag & RX_FLAG_AMPDU_IS_ZEROLEN) |
| flags |= IEEE80211_RADIOTAP_AMPDU_IS_ZEROLEN; |
| if (status->flag & RX_FLAG_AMPDU_LAST_KNOWN) |
| flags |= IEEE80211_RADIOTAP_AMPDU_LAST_KNOWN; |
| if (status->flag & RX_FLAG_AMPDU_IS_LAST) |
| flags |= IEEE80211_RADIOTAP_AMPDU_IS_LAST; |
| if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_ERROR) |
| flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_ERR; |
| if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN) |
| flags |= IEEE80211_RADIOTAP_AMPDU_DELIM_CRC_KNOWN; |
| put_unaligned_le16(flags, pos); |
| pos += 2; |
| if (status->flag & RX_FLAG_AMPDU_DELIM_CRC_KNOWN) |
| *pos++ = status->ampdu_delimiter_crc; |
| else |
| *pos++ = 0; |
| *pos++ = 0; |
| } |
| |
| if (status->flag & RX_FLAG_VHT) { |
| u16 known = local->hw.radiotap_vht_details; |
| |
| rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_VHT); |
| /* known field - how to handle 80+80? */ |
| if (status->flag & RX_FLAG_80P80MHZ) |
| known &= ~IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH; |
| put_unaligned_le16(known, pos); |
| pos += 2; |
| /* flags */ |
| if (status->flag & RX_FLAG_SHORT_GI) |
| *pos |= IEEE80211_RADIOTAP_VHT_FLAG_SGI; |
| pos++; |
| /* bandwidth */ |
| if (status->flag & RX_FLAG_80MHZ) |
| *pos++ = 4; |
| else if (status->flag & RX_FLAG_80P80MHZ) |
| *pos++ = 0; /* marked not known above */ |
| else if (status->flag & RX_FLAG_160MHZ) |
| *pos++ = 11; |
| else if (status->flag & RX_FLAG_40MHZ) |
| *pos++ = 1; |
| else /* 20 MHz */ |
| *pos++ = 0; |
| /* MCS/NSS */ |
| *pos = (status->rate_idx << 4) | status->vht_nss; |
| pos += 4; |
| /* coding field */ |
| pos++; |
| /* group ID */ |
| pos++; |
| /* partial_aid */ |
| pos += 2; |
| } |
| |
| if (status->vendor_radiotap_len) { |
| /* ensure 2 byte alignment for the vendor field as required */ |
| if ((pos - (u8 *)rthdr) & 1) |
| *pos++ = 0; |
| *pos++ = status->vendor_radiotap_oui[0]; |
| *pos++ = status->vendor_radiotap_oui[1]; |
| *pos++ = status->vendor_radiotap_oui[2]; |
| *pos++ = status->vendor_radiotap_subns; |
| put_unaligned_le16(status->vendor_radiotap_len, pos); |
| pos += 2; |
| /* align the actual payload as requested */ |
| while ((pos - (u8 *)rthdr) & (status->vendor_radiotap_align - 1)) |
| *pos++ = 0; |
| } |
| } |
| |
| /* |
| * 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; |
| struct sk_buff *skb, *skb2; |
| struct net_device *prev_dev = NULL; |
| int present_fcs_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 (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) |
| present_fcs_len = FCS_LEN; |
| |
| /* ensure hdr->frame_control and vendor radiotap data are in skb head */ |
| if (!pskb_may_pull(origskb, 2 + status->vendor_radiotap_len)) { |
| dev_kfree_skb(origskb); |
| return NULL; |
| } |
| |
| if (!local->monitors) { |
| if (should_drop_frame(origskb, present_fcs_len)) { |
| dev_kfree_skb(origskb); |
| return NULL; |
| } |
| |
| return remove_monitor_info(local, origskb); |
| } |
| |
| /* room for the radiotap header based on driver features */ |
| needed_headroom = ieee80211_rx_radiotap_space(local, status); |
| |
| if (should_drop_frame(origskb, present_fcs_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); |
| |
| if (!skb) |
| return origskb; |
| } |
| |
| /* prepend radiotap information */ |
| ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom, |
| true); |
| |
| 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 (sdata->vif.type != NL80211_IFTYPE_MONITOR) |
| continue; |
| |
| if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) |
| continue; |
| |
| if (!ieee80211_sdata_running(sdata)) |
| continue; |
| |
| if (prev_dev) { |
| skb2 = skb_clone(skb, GFP_ATOMIC); |
| if (skb2) { |
| skb2->dev = prev_dev; |
| netif_receive_skb(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_receive_skb(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; |
| 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_ONCE((unsigned long)rx->skb->data & 1, |
| "unaligned packet at 0x%p\n", rx->skb->data); |
| #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 (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; |
| 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 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 *skb = tid_agg_rx->reorder_buf[index]; |
| struct ieee80211_rx_status *status; |
| |
| lockdep_assert_held(&tid_agg_rx->reorder_lock); |
| |
| if (!skb) |
| goto no_frame; |
| |
| /* release the frame from the reorder ring buffer */ |
| tid_agg_rx->stored_mpdu_num--; |
| tid_agg_rx->reorder_buf[index] = NULL; |
| status = IEEE80211_SKB_RXCB(skb); |
| status->rx_flags |= IEEE80211_RX_DEFERRED_RELEASE; |
| __skb_queue_tail(frames, skb); |
| |
| no_frame: |
| 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 = ieee80211_sn_sub(tid_agg_rx->head_seq_num, |
| tid_agg_rx->ssn) % |
| 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, j; |
| |
| lockdep_assert_held(&tid_agg_rx->reorder_lock); |
| |
| /* release the buffer until next missing frame */ |
| index = ieee80211_sn_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) { |
| /* |
| * 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 (!tid_agg_rx->reorder_buf[j]) { |
| skipped++; |
| continue; |
| } |
| if (skipped && |
| !time_after(jiffies, tid_agg_rx->reorder_time[j] + |
| HT_RX_REORDER_BUF_TIMEOUT)) |
| goto set_release_timer; |
| |
| 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 (tid_agg_rx->reorder_buf[index]) { |
| ieee80211_release_reorder_frame(sdata, tid_agg_rx, index, |
| frames); |
| index = ieee80211_sn_sub(tid_agg_rx->head_seq_num, |
| tid_agg_rx->ssn) % |
| tid_agg_rx->buf_size; |
| } |
| |
| if (tid_agg_rx->stored_mpdu_num) { |
| j = index = ieee80211_sn_sub(tid_agg_rx->head_seq_num, |
| tid_agg_rx->ssn) % |
| tid_agg_rx->buf_size; |
| |
| for (; j != (index - 1) % tid_agg_rx->buf_size; |
| j = (j + 1) % tid_agg_rx->buf_size) { |
| if (tid_agg_rx->reorder_buf[j]) |
| break; |
| } |
| |
| set_release_timer: |
| |
| 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; |
| 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); |
| |
| buf_size = tid_agg_rx->buf_size; |
| head_seq_num = tid_agg_rx->head_seq_num; |
| |
| /* 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 = ieee80211_sn_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); |
| 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) { |
| 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 */ |
| tid_agg_rx->reorder_buf[index] = skb; |
| 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 ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
| 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)) |
| 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_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK; |
| |
| tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]); |
| if (!tid_agg_rx) |
| 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; |
| |
| /* not actually part of this BA session */ |
| if (!(status->rx_flags & IEEE80211_RX_RA_MATCH)) |
| 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->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME; |
| 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(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); |
| |
| /* |
| * Drop duplicate 802.11 retransmissions |
| * (IEEE 802.11-2012: 9.3.2.10 "Duplicate detection and recovery") |
| */ |
| if (rx->skb->len >= 24 && rx->sta && |
| !ieee80211_is_ctl(hdr->frame_control) && |
| !ieee80211_is_qos_nullfunc(hdr->frame_control) && |
| !is_multicast_ether_addr(hdr->addr1)) { |
| if (unlikely(ieee80211_has_retry(hdr->frame_control) && |
| rx->sta->last_seq_ctrl[rx->seqno_idx] == |
| hdr->seq_ctrl)) { |
| if (status->rx_flags & IEEE80211_RX_RA_MATCH) { |
| rx->local->dot11FrameDuplicateCount++; |
| rx->sta->num_duplicates++; |
| } |
| return RX_DROP_UNUSABLE; |
| } else |
| rx->sta->last_seq_ctrl[rx->seqno_idx] = 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->sdata->vif.type != NL80211_IFTYPE_WDS && |
| (!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_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; |
| int hdrlen; |
| ieee80211_rx_result result = RX_DROP_UNUSABLE; |
| struct ieee80211_key *sta_ptk = NULL; |
| int mmie_keyidx = -1; |
| __le16 fc; |
| |
| /* |
| * 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 (!(status->rx_flags & IEEE80211_RX_RA_MATCH)) |
| return RX_CONTINUE; |
| |
| /* start without a key */ |
| rx->key = NULL; |
| |
| if (rx->sta) |
| sta_ptk = rcu_dereference(rx->sta->ptk); |
| |
| fc = hdr->frame_control; |
| |
| if (!ieee80211_has_protected(fc)) |
| mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb); |
| |
| if (!is_multicast_ether_addr(hdr->addr1) && sta_ptk) { |
| rx->key = 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) { |
| /* 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) |
| 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_mgmt(fc) && |
| is_multicast_ether_addr(hdr->addr1) && |
| (key = rcu_dereference(rx->sdata->default_mgmt_key))) |
| rx->key = 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 { |
| u8 keyid; |
| /* |
| * 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; |
| |
| hdrlen = ieee80211_hdrlen(fc); |
| |
| 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 |
| */ |
| skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1); |
| keyidx = keyid >> 6; |
| |
| /* 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; |
| |
| rx->key->tx_rx_count++; |
| /* 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); |
| break; |
| case WLAN_CIPHER_SUITE_AES_CMAC: |
| result = ieee80211_crypto_aes_cmac_decrypt(rx); |
| break; |
| default: |
| /* |
| * We can reach here only with HW-only algorithms |
| * but why didn't it decrypt the frame?! |
| */ |
| return RX_DROP_UNUSABLE; |
| } |
| |
| /* the hdr variable is invalid after the decrypt handlers */ |
| |
| /* either the frame has been decrypted or will be dropped */ |
| 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 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; |
| |
| 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 (!(local->hw.flags & IEEE80211_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); |
| } |
| |
| 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)) { |
| ps_dbg(sta->sdata, "STA %pM aid %d driver-ps-blocked\n", |
| sta->sta.addr, sta->sta.aid); |
| return; |
| } |
| |
| ieee80211_sta_ps_deliver_wakeup(sta); |
| } |
| |
| int ieee80211_sta_ps_transition(struct ieee80211_sta *sta, bool start) |
| { |
| struct sta_info *sta_inf = container_of(sta, struct sta_info, sta); |
| bool in_ps; |
| |
| WARN_ON(!(sta_inf->local->hw.flags & IEEE80211_HW_AP_LINK_PS)); |
| |
| /* Don't let the same PS state be set twice */ |
| in_ps = test_sta_flag(sta_inf, WLAN_STA_PS_STA); |
| if ((start && in_ps) || (!start && !in_ps)) |
| return -EINVAL; |
| |
| if (start) |
| sta_ps_start(sta_inf); |
| else |
| sta_ps_end(sta_inf); |
| |
| return 0; |
| } |
| EXPORT_SYMBOL(ieee80211_sta_ps_transition); |
| |
| 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); |
| int tid, ac; |
| |
| if (!rx->sta || !(status->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_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 (sdata->local->hw.flags & IEEE80211_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))) { |
| if (!test_sta_flag(rx->sta, WLAN_STA_SP)) { |
| if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER)) |
| ieee80211_sta_ps_deliver_poll_response(rx->sta); |
| else |
| set_sta_flag(rx->sta, WLAN_STA_PSPOLL); |
| } |
| |
| /* 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))) { |
| tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK; |
| ac = ieee802_1d_to_ac[tid & 7]; |
| |
| /* |
| * If this AC is not trigger-enabled do nothing. |
| * |
| * 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 (!(rx->sta->sta.uapsd_queues & BIT(ac))) |
| return RX_CONTINUE; |
| |
| /* if we are in a service period, do nothing */ |
| if (test_sta_flag(rx->sta, WLAN_STA_SP)) |
| return RX_CONTINUE; |
| |
| if (!test_sta_flag(rx->sta, WLAN_STA_PS_DRIVER)) |
| ieee80211_sta_ps_deliver_uapsd(rx->sta); |
| else |
| set_sta_flag(rx->sta, WLAN_STA_UAPSD); |
| } |
| |
| 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; |
| |
| 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->last_rx = jiffies; |
| if (ieee80211_is_data(hdr->frame_control)) { |
| sta->last_rx_rate_idx = status->rate_idx; |
| sta->last_rx_rate_flag = status->flag; |
| sta->last_rx_rate_vht_nss = status->vht_nss; |
| } |
| } |
| } 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 (ieee80211_is_data(hdr->frame_control)) { |
| sta->last_rx_rate_idx = status->rate_idx; |
| sta->last_rx_rate_flag = status->flag; |
| sta->last_rx_rate_vht_nss = status->vht_nss; |
| } |
| } |
| |
| if (!(status->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; |
| if (!(status->flag & RX_FLAG_NO_SIGNAL_VAL)) { |
| sta->last_signal = status->signal; |
| ewma_add(&sta->avg_signal, -status->signal); |
| } |
| |
| /* |
| * Change STA power saving mode only at the end of a frame |
| * exchange sequence. |
| */ |
| if (!(sta->local->hw.flags & IEEE80211_HW_AP_LINK_PS) && |
| !ieee80211_has_morefrags(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)) { |
| /* |
| * 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)) |
| 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_nullfunc(hdr->frame_control) || |
| ieee80211_is_qos_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_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; |
| |
| entry = &sdata->fragments[sdata->fragment_next++]; |
| if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX) |
| sdata->fragment_next = 0; |
| |
| if (!skb_queue_empty(&entry->skb_list)) |
| __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)) || |
| !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 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; |
| struct ieee80211_rx_status *status; |
| |
| hdr = (struct ieee80211_hdr *)rx->skb->data; |
| fc = hdr->frame_control; |
| |
| if (ieee80211_is_ctl(fc)) |
| return RX_CONTINUE; |
| |
| sc = le16_to_cpu(hdr->seq_ctrl); |
| frag = sc & IEEE80211_SCTL_FRAG; |
| |
| if (likely((!ieee80211_has_morefrags(fc) && frag == 0) || |
| is_multicast_ether_addr(hdr->addr1))) { |
| /* not fragmented */ |
| 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(rx->sdata, frag, seq, |
| rx->seqno_idx, &(rx->skb)); |
| if (rx->key && rx->key->conf.cipher == WLAN_CIPHER_SUITE_CCMP && |
| ieee80211_has_protected(fc)) { |
| int queue = rx->security_idx; |
| /* 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[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->seqno_idx, 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; |
| int queue; |
| if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_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; |
| } |
| queue = rx->security_idx; |
| rpn = rx->key->u.ccmp.rx_pn[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 */ |
| status = IEEE80211_SKB_RXCB(rx->skb); |
| status->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 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 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; |
| |
| /* 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; |
| |
| 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)) |
| cfg80211_send_unprot_deauth(rx->sdata->dev, |
| rx->skb->data, |
| rx->skb->len); |
| else if (ieee80211_is_disassoc(fc)) |
| cfg80211_send_unprot_disassoc(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)) |
| cfg80211_send_unprot_deauth(rx->sdata->dev, |
| rx->skb->data, |
| rx->skb->len); |
| else if (ieee80211_is_disassoc(fc)) |
| cfg80211_send_unprot_disassoc(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( |
| (struct ieee80211_hdr *) rx->skb->data))) |
| 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 |
| 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. |
| */ |
| if (ehdr->h_proto == rx->sdata->control_port_protocol && |
| (ether_addr_equal(ehdr->h_dest, rx->sdata->vif.addr) || |
| ether_addr_equal(ehdr->h_dest, pae_group_addr))) |
| 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 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; |
| struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); |
| |
| 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) && |
| (status->rx_flags & IEEE80211_RX_RA_MATCH) && |
| (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) { |
| 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_info_ratelimited("%s: failed to clone multicast frame\n", |
| dev->name); |
| } else { |
| dsta = sta_info_get(sdata, skb->data); |
| 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; |
| } |
| } |
| } |
| |
| if (skb) { |
| int align __maybe_unused; |
| |
| #ifndef 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; 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 |
| * compare_ether_addr) |
| */ |
| 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) { |
| /* deliver to local stack */ |
| skb->protocol = eth_type_trans(skb, dev); |
| memset(skb->cb, 0, sizeof(skb->cb)); |
| netif_receive_skb(skb); |
| } |
| } |
| |
| 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) |
| { |
| 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 ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); |
| |
| if (unlikely(!ieee80211_is_data(fc))) |
| return RX_CONTINUE; |
| |
| if (unlikely(!ieee80211_is_data_present(fc))) |
| return RX_DROP_MONITOR; |
| |
| if (!(status->rx_flags & IEEE80211_RX_AMSDU)) |
| return RX_CONTINUE; |
| |
| if (ieee80211_has_a4(hdr->frame_control) && |
| rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN && |
| !rx->sdata->u.vlan.sta) |
| return RX_DROP_UNUSABLE; |
| |
| if (is_multicast_ether_addr(hdr->addr1) && |
| ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN && |
| rx->sdata->u.vlan.sta) || |
| (rx->sdata->vif.type == NL80211_IFTYPE_STATION && |
| rx->sdata->u.mgd.use_4addr))) |
| return RX_DROP_UNUSABLE; |
| |
| skb->dev = dev; |
| __skb_queue_head_init(&frame_list); |
| |
| if (skb_linearize(skb)) |
| return RX_DROP_UNUSABLE; |
| |
| ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr, |
| rx->sdata->vif.type, |
| rx->local->hw.extra_tx_headroom, true); |
| |
| while (!skb_queue_empty(&frame_list)) { |
| rx->skb = __skb_dequeue(&frame_list); |
| |
| if (!ieee80211_frame_allowed(rx, fc)) { |
| dev_kfree_skb(rx->skb); |
| continue; |
| } |
| dev->stats.rx_packets++; |
| dev->stats.rx_bytes += rx->skb->len; |
| |
| 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 *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_rx_status *status = IEEE80211_SKB_RXCB(skb); |
| struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh; |
| __le16 reason = cpu_to_le16(WLAN_REASON_MESH_PATH_NOFORWARD); |
| u16 q, hdrlen; |
| |
| 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); |
| |
| /* 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) || |
| !(status->rx_flags & IEEE80211_RX_RA_MATCH)) |
| 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_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); |
| 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; |
| |
| q = ieee80211_select_queue_80211(sdata, skb, hdr); |
| 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) { |
| IEEE80211_IFSTA_MESH_CTR_INC(ifmsh, dropped_frames_ttl); |
| goto out; |
| } |
| |
| if (!ifmsh->mshcfg.dot11MeshForwarding) |
| goto out; |
| |
| fwd_skb = skb_copy(skb, GFP_ATOMIC); |
| if (!fwd_skb) { |
| net_info_ratelimited("%s: failed to clone mesh frame\n", |
| sdata->name); |
| 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->flags |= IEEE80211_TX_INTFL_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, reason, 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) || |
| sdata->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 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; |
| |
| 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; |
| |
| dev->stats.rx_packets++; |
| dev->stats.rx_bytes += rx->skb->len; |
| |
| if (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; |
| |
| 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; |
| |
| 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; |
| |
| /* 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); |
| |
| 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 = (struct ieee80211_mgmt *) skb_put(skb, 24); |
| memset(resp, 0, 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); |
| |
| /* |
| * 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 (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM) |
| sig = status->signal; |
| |
| cfg80211_report_obss_beacon(rx->local->hw.wiphy, |
| rx->skb->data, rx->skb->len, |
| status->freq, sig); |
| rx->flags |= IEEE80211_RX_BEACON_REPORTED; |
| } |
| |
| if (!(status->rx_flags & IEEE80211_RX_RA_MATCH)) |
| return RX_DROP_MONITOR; |
| |
| 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) |
| return RX_DROP_UNUSABLE; |
| |
| if (!(status->rx_flags & IEEE80211_RX_RA_MATCH)) |
| 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; |
| |
| /* 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; |
| |
| sband = rx->local->hw.wiphy->bands[status->band]; |
| |
| rate_control_rate_update(local, sband, rx->sta, |
| IEEE80211_RC_SMPS_CHANGED); |
| 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 new_bw; |
| |
| /* 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) |
| new_bw = IEEE80211_STA_RX_BW_20; |
| else |
| new_bw = ieee80211_sta_cur_vht_bw(rx->sta); |
| |
| if (rx->sta->sta.bandwidth == new_bw) |
| goto handled; |
| |
| sband = rx->local->hw.wiphy->bands[status->band]; |
| |
| rate_control_rate_update(local, sband, rx->sta, |
| IEEE80211_RC_BW_CHANGED); |
| 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: { |
| u8 opmode; |
| |
| /* verify opmode is present */ |
| if (len < IEEE80211_MIN_ACTION_SIZE + 2) |
| goto invalid; |
| |
| opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode; |
| |
| ieee80211_vht_handle_opmode(rx->sdata, rx->sta, |
| opmode, status->band, |
| false); |
| goto handled; |
| } |
| 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: |
| if (status->band != IEEE80211_BAND_5GHZ) |
| break; |
| |
| if (sdata->vif.type != NL80211_IFTYPE_STATION) |
| break; |
| |
| /* 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 (len < (IEEE80211_MIN_ACTION_SIZE + |
| sizeof(mgmt->u.action.u.measurement))) |
| break; |
| ieee80211_process_measurement_req(sdata, mgmt, len); |
| goto handled; |
| case WLAN_ACTION_SPCT_CHL_SWITCH: |
| if (sdata->vif.type != NL80211_IFTYPE_STATION) |
| break; |
| |
| if (!ether_addr_equal(mgmt->bssid, sdata->u.mgd.bssid)) |
| break; |
| |
| goto queue; |
| } |
| break; |
| 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; |
| 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_packets++; |
| dev_kfree_skb(rx->skb); |
| return RX_QUEUED; |
| |
| queue: |
| rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME; |
| skb_queue_tail(&sdata->skb_queue, rx->skb); |
| ieee80211_queue_work(&local->hw, &sdata->work); |
| if (rx->sta) |
| rx->sta->rx_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 (rx->local->hw.flags & IEEE80211_HW_SIGNAL_DBM) |
| sig = status->signal; |
| |
| if (cfg80211_rx_mgmt(&rx->sdata->wdev, status->freq, sig, |
| rx->skb->data, rx->skb->len, |
| GFP_ATOMIC)) { |
| if (rx->sta) |
| rx->sta->rx_packets++; |
| dev_kfree_skb(rx->skb); |
| return RX_QUEUED; |
| } |
| |
| return RX_CONTINUE; |
| } |
| |
| 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 (local->hw.flags & IEEE80211_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_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_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_ASSOC_RESP): |
| case cpu_to_le16(IEEE80211_STYPE_REASSOC_RESP): |
| case cpu_to_le16(IEEE80211_STYPE_DEAUTH): |
| 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 */ |
| rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME; |
| skb_queue_tail(&sdata->skb_queue, rx->skb); |
| ieee80211_queue_work(&rx->local->hw, &sdata->work); |
| if (rx->sta) |
| rx->sta->rx_packets++; |
| |
| return RX_QUEUED; |
| } |
| |
| /* TODO: use IEEE80211_RX_FRAGMENTED */ |
| 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; |
| |
| /* room for the radiotap header based on driver features */ |
| needed_headroom = ieee80211_rx_radiotap_space(local, status); |
| |
| 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_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 (!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; |
| sdata->dev->stats.rx_packets++; |
| sdata->dev->stats.rx_bytes += 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_dropped++; |
| /* fall through */ |
| 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->flag & RX_FLAG_HT) && |
| !(status->flag & RX_FLAG_VHT)) |
| 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_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); |
| |
| 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_decrypt) |
| 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_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_return) |
| 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) |
| |
| 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, |
| .flags = 0, |
| }; |
| 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); |
| |
| ieee80211_rx_handlers(&rx, &frames); |
| } |
| |
| /* main receive path */ |
| |
| static int prepare_for_handlers(struct ieee80211_rx_data *rx, |
| struct ieee80211_hdr *hdr) |
| { |
| struct ieee80211_sub_if_data *sdata = rx->sdata; |
| struct sk_buff *skb = rx->skb; |
| struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
| u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type); |
| int multicast = is_multicast_ether_addr(hdr->addr1); |
| |
| switch (sdata->vif.type) { |
| case NL80211_IFTYPE_STATION: |
| if (!bssid && !sdata->u.mgd.use_4addr) |
| return 0; |
| if (!multicast && |
| !ether_addr_equal(sdata->vif.addr, hdr->addr1)) { |
| if (!(sdata->dev->flags & IFF_PROMISC) || |
| sdata->u.mgd.use_4addr) |
| return 0; |
| status->rx_flags &= ~IEEE80211_RX_RA_MATCH; |
| } |
| break; |
| case NL80211_IFTYPE_ADHOC: |
| if (!bssid) |
| return 0; |
| if (ether_addr_equal(sdata->vif.addr, hdr->addr2) || |
| ether_addr_equal(sdata->u.ibss.bssid, hdr->addr2)) |
| return 0; |
| if (ieee80211_is_beacon(hdr->frame_control)) { |
| return 1; |
| } else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) { |
| return 0; |
| } else if (!multicast && |
| !ether_addr_equal(sdata->vif.addr, hdr->addr1)) { |
| if (!(sdata->dev->flags & IFF_PROMISC)) |
| return <
|