Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2002-2005, Instant802 Networks, Inc. |
| 3 | * Copyright 2005-2006, Devicescape Software, Inc. |
| 4 | * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> |
Johannes Berg | 8404080 | 2010-02-15 12:46:39 +0200 | [diff] [blame] | 5 | * Copyright 2007-2010 Johannes Berg <johannes@sipsolutions.net> |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License version 2 as |
| 9 | * published by the Free Software Foundation. |
| 10 | */ |
| 11 | |
S.Çağlar Onur | ab46623 | 2008-02-14 17:36:47 +0200 | [diff] [blame] | 12 | #include <linux/jiffies.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 13 | #include <linux/slab.h> |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 14 | #include <linux/kernel.h> |
| 15 | #include <linux/skbuff.h> |
| 16 | #include <linux/netdevice.h> |
| 17 | #include <linux/etherdevice.h> |
Johannes Berg | d4e46a3 | 2007-09-14 11:10:24 -0400 | [diff] [blame] | 18 | #include <linux/rcupdate.h> |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 19 | #include <net/mac80211.h> |
| 20 | #include <net/ieee80211_radiotap.h> |
| 21 | |
| 22 | #include "ieee80211_i.h" |
Johannes Berg | 2448798 | 2009-04-23 18:52:52 +0200 | [diff] [blame] | 23 | #include "driver-ops.h" |
Johannes Berg | 2c8dccc | 2008-04-08 15:14:40 -0400 | [diff] [blame] | 24 | #include "led.h" |
Luis Carlos Cobo | 33b64eb | 2008-02-23 15:17:10 +0100 | [diff] [blame] | 25 | #include "mesh.h" |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 26 | #include "wep.h" |
| 27 | #include "wpa.h" |
| 28 | #include "tkip.h" |
| 29 | #include "wme.h" |
| 30 | |
Johannes Berg | b2e7771 | 2007-09-26 15:19:39 +0200 | [diff] [blame] | 31 | /* |
| 32 | * monitor mode reception |
| 33 | * |
| 34 | * This function cleans up the SKB, i.e. it removes all the stuff |
| 35 | * only useful for monitoring. |
| 36 | */ |
| 37 | static struct sk_buff *remove_monitor_info(struct ieee80211_local *local, |
Johannes Berg | 0869aea | 2009-10-28 10:03:35 +0100 | [diff] [blame] | 38 | struct sk_buff *skb) |
Johannes Berg | b2e7771 | 2007-09-26 15:19:39 +0200 | [diff] [blame] | 39 | { |
Johannes Berg | b2e7771 | 2007-09-26 15:19:39 +0200 | [diff] [blame] | 40 | if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) { |
| 41 | if (likely(skb->len > FCS_LEN)) |
Zhu Yi | e3cf8b3 | 2010-03-29 17:35:07 +0800 | [diff] [blame] | 42 | __pskb_trim(skb, skb->len - FCS_LEN); |
Johannes Berg | b2e7771 | 2007-09-26 15:19:39 +0200 | [diff] [blame] | 43 | else { |
| 44 | /* driver bug */ |
| 45 | WARN_ON(1); |
| 46 | dev_kfree_skb(skb); |
| 47 | skb = NULL; |
| 48 | } |
| 49 | } |
| 50 | |
| 51 | return skb; |
| 52 | } |
| 53 | |
Johannes Berg | f1d58c2 | 2009-06-17 13:13:00 +0200 | [diff] [blame] | 54 | static inline int should_drop_frame(struct sk_buff *skb, |
Johannes Berg | 0869aea | 2009-10-28 10:03:35 +0100 | [diff] [blame] | 55 | int present_fcs_len) |
Johannes Berg | b2e7771 | 2007-09-26 15:19:39 +0200 | [diff] [blame] | 56 | { |
Johannes Berg | f1d58c2 | 2009-06-17 13:13:00 +0200 | [diff] [blame] | 57 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
Harvey Harrison | 182503a | 2008-06-22 16:45:29 -0700 | [diff] [blame] | 58 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; |
Johannes Berg | b2e7771 | 2007-09-26 15:19:39 +0200 | [diff] [blame] | 59 | |
| 60 | if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC)) |
| 61 | return 1; |
Johannes Berg | 0869aea | 2009-10-28 10:03:35 +0100 | [diff] [blame] | 62 | if (unlikely(skb->len < 16 + present_fcs_len)) |
Johannes Berg | b2e7771 | 2007-09-26 15:19:39 +0200 | [diff] [blame] | 63 | return 1; |
Harvey Harrison | 87228f5 | 2008-06-11 14:21:59 -0700 | [diff] [blame] | 64 | if (ieee80211_is_ctl(hdr->frame_control) && |
| 65 | !ieee80211_is_pspoll(hdr->frame_control) && |
| 66 | !ieee80211_is_back_req(hdr->frame_control)) |
Johannes Berg | b2e7771 | 2007-09-26 15:19:39 +0200 | [diff] [blame] | 67 | return 1; |
| 68 | return 0; |
| 69 | } |
| 70 | |
Bruno Randolf | 601ae7f | 2008-05-08 19:22:43 +0200 | [diff] [blame] | 71 | static int |
| 72 | ieee80211_rx_radiotap_len(struct ieee80211_local *local, |
| 73 | struct ieee80211_rx_status *status) |
| 74 | { |
| 75 | int len; |
| 76 | |
| 77 | /* always present fields */ |
| 78 | len = sizeof(struct ieee80211_radiotap_header) + 9; |
| 79 | |
| 80 | if (status->flag & RX_FLAG_TSFT) |
| 81 | len += 8; |
Johannes Berg | 7fee537 | 2009-01-30 11:13:06 +0100 | [diff] [blame] | 82 | if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) |
Bruno Randolf | 601ae7f | 2008-05-08 19:22:43 +0200 | [diff] [blame] | 83 | len += 1; |
Bruno Randolf | 601ae7f | 2008-05-08 19:22:43 +0200 | [diff] [blame] | 84 | |
| 85 | if (len & 1) /* padding for RX_FLAGS if necessary */ |
| 86 | len++; |
| 87 | |
Bruno Randolf | 601ae7f | 2008-05-08 19:22:43 +0200 | [diff] [blame] | 88 | return len; |
| 89 | } |
| 90 | |
Johannes Berg | d1c3a37 | 2009-01-07 00:26:10 +0100 | [diff] [blame] | 91 | /* |
Bruno Randolf | 601ae7f | 2008-05-08 19:22:43 +0200 | [diff] [blame] | 92 | * ieee80211_add_rx_radiotap_header - add radiotap header |
| 93 | * |
| 94 | * add a radiotap header containing all the fields which the hardware provided. |
| 95 | */ |
| 96 | static void |
| 97 | ieee80211_add_rx_radiotap_header(struct ieee80211_local *local, |
| 98 | struct sk_buff *skb, |
Bruno Randolf | 601ae7f | 2008-05-08 19:22:43 +0200 | [diff] [blame] | 99 | struct ieee80211_rate *rate, |
| 100 | int rtap_len) |
| 101 | { |
Johannes Berg | f1d58c2 | 2009-06-17 13:13:00 +0200 | [diff] [blame] | 102 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
Bruno Randolf | 601ae7f | 2008-05-08 19:22:43 +0200 | [diff] [blame] | 103 | struct ieee80211_radiotap_header *rthdr; |
| 104 | unsigned char *pos; |
Johannes Berg | 6a86b9c | 2009-10-28 09:58:52 +0100 | [diff] [blame] | 105 | u16 rx_flags = 0; |
Bruno Randolf | 601ae7f | 2008-05-08 19:22:43 +0200 | [diff] [blame] | 106 | |
| 107 | rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len); |
| 108 | memset(rthdr, 0, rtap_len); |
| 109 | |
| 110 | /* radiotap header, set always present flags */ |
| 111 | rthdr->it_present = |
| 112 | cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) | |
Bruno Randolf | 601ae7f | 2008-05-08 19:22:43 +0200 | [diff] [blame] | 113 | (1 << IEEE80211_RADIOTAP_CHANNEL) | |
| 114 | (1 << IEEE80211_RADIOTAP_ANTENNA) | |
| 115 | (1 << IEEE80211_RADIOTAP_RX_FLAGS)); |
| 116 | rthdr->it_len = cpu_to_le16(rtap_len); |
| 117 | |
| 118 | pos = (unsigned char *)(rthdr+1); |
| 119 | |
| 120 | /* the order of the following fields is important */ |
| 121 | |
| 122 | /* IEEE80211_RADIOTAP_TSFT */ |
| 123 | if (status->flag & RX_FLAG_TSFT) { |
Johannes Berg | 6a86b9c | 2009-10-28 09:58:52 +0100 | [diff] [blame] | 124 | put_unaligned_le64(status->mactime, pos); |
Bruno Randolf | 601ae7f | 2008-05-08 19:22:43 +0200 | [diff] [blame] | 125 | rthdr->it_present |= |
| 126 | cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT); |
| 127 | pos += 8; |
| 128 | } |
| 129 | |
| 130 | /* IEEE80211_RADIOTAP_FLAGS */ |
| 131 | if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) |
| 132 | *pos |= IEEE80211_RADIOTAP_F_FCS; |
Johannes Berg | aae8983 | 2009-03-13 12:52:10 +0100 | [diff] [blame] | 133 | if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC)) |
| 134 | *pos |= IEEE80211_RADIOTAP_F_BADFCS; |
Bruno Randolf | b4f28bb | 2008-07-30 17:19:55 +0200 | [diff] [blame] | 135 | if (status->flag & RX_FLAG_SHORTPRE) |
| 136 | *pos |= IEEE80211_RADIOTAP_F_SHORTPRE; |
Bruno Randolf | 601ae7f | 2008-05-08 19:22:43 +0200 | [diff] [blame] | 137 | pos++; |
| 138 | |
| 139 | /* IEEE80211_RADIOTAP_RATE */ |
Jouni Malinen | 0fb8ca4 | 2008-12-12 14:38:33 +0200 | [diff] [blame] | 140 | if (status->flag & RX_FLAG_HT) { |
| 141 | /* |
| 142 | * TODO: add following information into radiotap header once |
| 143 | * suitable fields are defined for it: |
| 144 | * - MCS index (status->rate_idx) |
| 145 | * - HT40 (status->flag & RX_FLAG_40MHZ) |
| 146 | * - short-GI (status->flag & RX_FLAG_SHORT_GI) |
| 147 | */ |
| 148 | *pos = 0; |
Jouni Malinen | 8d6f658 | 2008-12-15 10:37:50 +0200 | [diff] [blame] | 149 | } else { |
Jouni Malinen | ebe6c7b | 2009-01-10 11:47:33 +0200 | [diff] [blame] | 150 | rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE); |
Jouni Malinen | 0fb8ca4 | 2008-12-12 14:38:33 +0200 | [diff] [blame] | 151 | *pos = rate->bitrate / 5; |
Jouni Malinen | 8d6f658 | 2008-12-15 10:37:50 +0200 | [diff] [blame] | 152 | } |
Bruno Randolf | 601ae7f | 2008-05-08 19:22:43 +0200 | [diff] [blame] | 153 | pos++; |
| 154 | |
| 155 | /* IEEE80211_RADIOTAP_CHANNEL */ |
Johannes Berg | 6a86b9c | 2009-10-28 09:58:52 +0100 | [diff] [blame] | 156 | put_unaligned_le16(status->freq, pos); |
Bruno Randolf | 601ae7f | 2008-05-08 19:22:43 +0200 | [diff] [blame] | 157 | pos += 2; |
| 158 | if (status->band == IEEE80211_BAND_5GHZ) |
Johannes Berg | 6a86b9c | 2009-10-28 09:58:52 +0100 | [diff] [blame] | 159 | put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_5GHZ, |
| 160 | pos); |
Johannes Berg | 5f0b7de | 2009-11-16 13:58:21 +0100 | [diff] [blame] | 161 | else if (status->flag & RX_FLAG_HT) |
| 162 | put_unaligned_le16(IEEE80211_CHAN_DYN | IEEE80211_CHAN_2GHZ, |
| 163 | pos); |
Bruno Randolf | 9deb1ae | 2008-07-30 17:20:06 +0200 | [diff] [blame] | 164 | else if (rate->flags & IEEE80211_RATE_ERP_G) |
Johannes Berg | 6a86b9c | 2009-10-28 09:58:52 +0100 | [diff] [blame] | 165 | put_unaligned_le16(IEEE80211_CHAN_OFDM | IEEE80211_CHAN_2GHZ, |
| 166 | pos); |
Bruno Randolf | 601ae7f | 2008-05-08 19:22:43 +0200 | [diff] [blame] | 167 | else |
Johannes Berg | 6a86b9c | 2009-10-28 09:58:52 +0100 | [diff] [blame] | 168 | put_unaligned_le16(IEEE80211_CHAN_CCK | IEEE80211_CHAN_2GHZ, |
| 169 | pos); |
Bruno Randolf | 601ae7f | 2008-05-08 19:22:43 +0200 | [diff] [blame] | 170 | pos += 2; |
| 171 | |
| 172 | /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */ |
| 173 | if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) { |
| 174 | *pos = status->signal; |
| 175 | rthdr->it_present |= |
| 176 | cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL); |
| 177 | pos++; |
| 178 | } |
| 179 | |
Bruno Randolf | 601ae7f | 2008-05-08 19:22:43 +0200 | [diff] [blame] | 180 | /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */ |
| 181 | |
| 182 | /* IEEE80211_RADIOTAP_ANTENNA */ |
| 183 | *pos = status->antenna; |
| 184 | pos++; |
| 185 | |
Bruno Randolf | 601ae7f | 2008-05-08 19:22:43 +0200 | [diff] [blame] | 186 | /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */ |
| 187 | |
| 188 | /* IEEE80211_RADIOTAP_RX_FLAGS */ |
| 189 | /* ensure 2 byte alignment for the 2 byte field as required */ |
Johannes Berg | 6a86b9c | 2009-10-28 09:58:52 +0100 | [diff] [blame] | 190 | if ((pos - (u8 *)rthdr) & 1) |
Bruno Randolf | 601ae7f | 2008-05-08 19:22:43 +0200 | [diff] [blame] | 191 | pos++; |
Johannes Berg | aae8983 | 2009-03-13 12:52:10 +0100 | [diff] [blame] | 192 | if (status->flag & RX_FLAG_FAILED_PLCP_CRC) |
Johannes Berg | 6a86b9c | 2009-10-28 09:58:52 +0100 | [diff] [blame] | 193 | rx_flags |= IEEE80211_RADIOTAP_F_RX_BADPLCP; |
| 194 | put_unaligned_le16(rx_flags, pos); |
Bruno Randolf | 601ae7f | 2008-05-08 19:22:43 +0200 | [diff] [blame] | 195 | pos += 2; |
| 196 | } |
| 197 | |
Johannes Berg | b2e7771 | 2007-09-26 15:19:39 +0200 | [diff] [blame] | 198 | /* |
| 199 | * This function copies a received frame to all monitor interfaces and |
| 200 | * returns a cleaned-up SKB that no longer includes the FCS nor the |
| 201 | * radiotap header the driver might have added. |
| 202 | */ |
| 203 | static struct sk_buff * |
| 204 | ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb, |
Johannes Berg | 8318d78 | 2008-01-24 19:38:38 +0100 | [diff] [blame] | 205 | struct ieee80211_rate *rate) |
Johannes Berg | b2e7771 | 2007-09-26 15:19:39 +0200 | [diff] [blame] | 206 | { |
Johannes Berg | f1d58c2 | 2009-06-17 13:13:00 +0200 | [diff] [blame] | 207 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb); |
Johannes Berg | b2e7771 | 2007-09-26 15:19:39 +0200 | [diff] [blame] | 208 | struct ieee80211_sub_if_data *sdata; |
Johannes Berg | b2e7771 | 2007-09-26 15:19:39 +0200 | [diff] [blame] | 209 | int needed_headroom = 0; |
Johannes Berg | b2e7771 | 2007-09-26 15:19:39 +0200 | [diff] [blame] | 210 | struct sk_buff *skb, *skb2; |
| 211 | struct net_device *prev_dev = NULL; |
| 212 | int present_fcs_len = 0; |
Johannes Berg | b2e7771 | 2007-09-26 15:19:39 +0200 | [diff] [blame] | 213 | |
| 214 | /* |
| 215 | * First, we may need to make a copy of the skb because |
| 216 | * (1) we need to modify it for radiotap (if not present), and |
| 217 | * (2) the other RX handlers will modify the skb we got. |
| 218 | * |
| 219 | * We don't need to, of course, if we aren't going to return |
| 220 | * the SKB because it has a bad FCS/PLCP checksum. |
| 221 | */ |
Johannes Berg | 0869aea | 2009-10-28 10:03:35 +0100 | [diff] [blame] | 222 | |
| 223 | /* room for the radiotap header based on driver features */ |
| 224 | needed_headroom = ieee80211_rx_radiotap_len(local, status); |
Johannes Berg | b2e7771 | 2007-09-26 15:19:39 +0200 | [diff] [blame] | 225 | |
| 226 | if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) |
| 227 | present_fcs_len = FCS_LEN; |
| 228 | |
Zhu Yi | e3cf8b3 | 2010-03-29 17:35:07 +0800 | [diff] [blame] | 229 | /* make sure hdr->frame_control is on the linear part */ |
| 230 | if (!pskb_may_pull(origskb, 2)) { |
| 231 | dev_kfree_skb(origskb); |
| 232 | return NULL; |
| 233 | } |
| 234 | |
Johannes Berg | b2e7771 | 2007-09-26 15:19:39 +0200 | [diff] [blame] | 235 | if (!local->monitors) { |
Johannes Berg | 0869aea | 2009-10-28 10:03:35 +0100 | [diff] [blame] | 236 | if (should_drop_frame(origskb, present_fcs_len)) { |
Johannes Berg | b2e7771 | 2007-09-26 15:19:39 +0200 | [diff] [blame] | 237 | dev_kfree_skb(origskb); |
| 238 | return NULL; |
| 239 | } |
| 240 | |
Johannes Berg | 0869aea | 2009-10-28 10:03:35 +0100 | [diff] [blame] | 241 | return remove_monitor_info(local, origskb); |
Johannes Berg | b2e7771 | 2007-09-26 15:19:39 +0200 | [diff] [blame] | 242 | } |
| 243 | |
Johannes Berg | 0869aea | 2009-10-28 10:03:35 +0100 | [diff] [blame] | 244 | if (should_drop_frame(origskb, present_fcs_len)) { |
Johannes Berg | b2e7771 | 2007-09-26 15:19:39 +0200 | [diff] [blame] | 245 | /* only need to expand headroom if necessary */ |
| 246 | skb = origskb; |
| 247 | origskb = NULL; |
| 248 | |
| 249 | /* |
| 250 | * This shouldn't trigger often because most devices have an |
| 251 | * RX header they pull before we get here, and that should |
| 252 | * be big enough for our radiotap information. We should |
| 253 | * probably export the length to drivers so that we can have |
| 254 | * them allocate enough headroom to start with. |
| 255 | */ |
| 256 | if (skb_headroom(skb) < needed_headroom && |
Johannes Berg | c49e5ea | 2007-12-11 21:33:42 +0100 | [diff] [blame] | 257 | pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) { |
Johannes Berg | b2e7771 | 2007-09-26 15:19:39 +0200 | [diff] [blame] | 258 | dev_kfree_skb(skb); |
| 259 | return NULL; |
| 260 | } |
| 261 | } else { |
| 262 | /* |
| 263 | * Need to make a copy and possibly remove radiotap header |
| 264 | * and FCS from the original. |
| 265 | */ |
| 266 | skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC); |
| 267 | |
Johannes Berg | 0869aea | 2009-10-28 10:03:35 +0100 | [diff] [blame] | 268 | origskb = remove_monitor_info(local, origskb); |
Johannes Berg | b2e7771 | 2007-09-26 15:19:39 +0200 | [diff] [blame] | 269 | |
| 270 | if (!skb) |
| 271 | return origskb; |
| 272 | } |
| 273 | |
Johannes Berg | 0869aea | 2009-10-28 10:03:35 +0100 | [diff] [blame] | 274 | /* prepend radiotap information */ |
| 275 | ieee80211_add_rx_radiotap_header(local, skb, rate, needed_headroom); |
Johannes Berg | b2e7771 | 2007-09-26 15:19:39 +0200 | [diff] [blame] | 276 | |
Johannes Berg | ce3edf6d0 | 2007-12-19 01:31:22 +0100 | [diff] [blame] | 277 | skb_reset_mac_header(skb); |
Johannes Berg | b2e7771 | 2007-09-26 15:19:39 +0200 | [diff] [blame] | 278 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
| 279 | skb->pkt_type = PACKET_OTHERHOST; |
| 280 | skb->protocol = htons(ETH_P_802_2); |
| 281 | |
| 282 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { |
Johannes Berg | 05c914f | 2008-09-11 00:01:58 +0200 | [diff] [blame] | 283 | if (sdata->vif.type != NL80211_IFTYPE_MONITOR) |
Johannes Berg | b2e7771 | 2007-09-26 15:19:39 +0200 | [diff] [blame] | 284 | continue; |
| 285 | |
Michael Wu | 3d30d94 | 2008-01-31 19:48:27 +0100 | [diff] [blame] | 286 | if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) |
| 287 | continue; |
| 288 | |
Johannes Berg | 9607e6b | 2009-12-23 13:15:31 +0100 | [diff] [blame] | 289 | if (!ieee80211_sdata_running(sdata)) |
Johannes Berg | 47846c9 | 2009-11-25 17:46:19 +0100 | [diff] [blame] | 290 | continue; |
| 291 | |
Johannes Berg | b2e7771 | 2007-09-26 15:19:39 +0200 | [diff] [blame] | 292 | if (prev_dev) { |
| 293 | skb2 = skb_clone(skb, GFP_ATOMIC); |
| 294 | if (skb2) { |
| 295 | skb2->dev = prev_dev; |
John W. Linville | 5548a8a | 2010-06-24 14:25:56 -0400 | [diff] [blame] | 296 | netif_receive_skb(skb2); |
Johannes Berg | b2e7771 | 2007-09-26 15:19:39 +0200 | [diff] [blame] | 297 | } |
| 298 | } |
| 299 | |
| 300 | prev_dev = sdata->dev; |
| 301 | sdata->dev->stats.rx_packets++; |
| 302 | sdata->dev->stats.rx_bytes += skb->len; |
| 303 | } |
| 304 | |
| 305 | if (prev_dev) { |
| 306 | skb->dev = prev_dev; |
John W. Linville | 5548a8a | 2010-06-24 14:25:56 -0400 | [diff] [blame] | 307 | netif_receive_skb(skb); |
Johannes Berg | b2e7771 | 2007-09-26 15:19:39 +0200 | [diff] [blame] | 308 | } else |
| 309 | dev_kfree_skb(skb); |
| 310 | |
| 311 | return origskb; |
| 312 | } |
| 313 | |
| 314 | |
Johannes Berg | 5cf121c | 2008-02-25 16:27:43 +0100 | [diff] [blame] | 315 | static void ieee80211_parse_qos(struct ieee80211_rx_data *rx) |
Johannes Berg | 6e0d114 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 316 | { |
Harvey Harrison | 238f74a | 2008-07-02 11:05:34 -0700 | [diff] [blame] | 317 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
Johannes Berg | 6e0d114 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 318 | int tid; |
| 319 | |
| 320 | /* does the frame have a qos control field? */ |
Harvey Harrison | 238f74a | 2008-07-02 11:05:34 -0700 | [diff] [blame] | 321 | if (ieee80211_is_data_qos(hdr->frame_control)) { |
| 322 | u8 *qc = ieee80211_get_qos_ctl(hdr); |
Johannes Berg | 6e0d114 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 323 | /* frame has qos control */ |
Harvey Harrison | 238f74a | 2008-07-02 11:05:34 -0700 | [diff] [blame] | 324 | tid = *qc & IEEE80211_QOS_CTL_TID_MASK; |
| 325 | if (*qc & IEEE80211_QOS_CONTROL_A_MSDU_PRESENT) |
Johannes Berg | 5cf121c | 2008-02-25 16:27:43 +0100 | [diff] [blame] | 326 | rx->flags |= IEEE80211_RX_AMSDU; |
Ron Rindjunsky | fd4c7f2 | 2007-11-26 16:14:33 +0200 | [diff] [blame] | 327 | else |
Johannes Berg | 5cf121c | 2008-02-25 16:27:43 +0100 | [diff] [blame] | 328 | rx->flags &= ~IEEE80211_RX_AMSDU; |
Johannes Berg | 6e0d114 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 329 | } else { |
Johannes Berg | 1411f9b | 2008-07-10 10:11:02 +0200 | [diff] [blame] | 330 | /* |
| 331 | * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"): |
| 332 | * |
| 333 | * Sequence numbers for management frames, QoS data |
| 334 | * frames with a broadcast/multicast address in the |
| 335 | * Address 1 field, and all non-QoS data frames sent |
| 336 | * by QoS STAs are assigned using an additional single |
| 337 | * modulo-4096 counter, [...] |
| 338 | * |
| 339 | * We also use that counter for non-QoS STAs. |
| 340 | */ |
| 341 | tid = NUM_RX_DATA_QUEUES - 1; |
Johannes Berg | 6e0d114 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 342 | } |
Johannes Berg | 52865df | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 343 | |
Johannes Berg | 5cf121c | 2008-02-25 16:27:43 +0100 | [diff] [blame] | 344 | rx->queue = tid; |
Johannes Berg | 6e0d114 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 345 | /* Set skb->priority to 1d tag if highest order bit of TID is not set. |
| 346 | * For now, set skb->priority to 0 for other cases. */ |
| 347 | rx->skb->priority = (tid > 7) ? 0 : tid; |
Johannes Berg | 38f3714 | 2008-01-29 17:07:43 +0100 | [diff] [blame] | 348 | } |
Johannes Berg | 6e0d114 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 349 | |
Johannes Berg | d1c3a37 | 2009-01-07 00:26:10 +0100 | [diff] [blame] | 350 | /** |
| 351 | * DOC: Packet alignment |
| 352 | * |
| 353 | * Drivers always need to pass packets that are aligned to two-byte boundaries |
| 354 | * to the stack. |
| 355 | * |
| 356 | * Additionally, should, if possible, align the payload data in a way that |
| 357 | * guarantees that the contained IP header is aligned to a four-byte |
| 358 | * boundary. In the case of regular frames, this simply means aligning the |
| 359 | * payload to a four-byte boundary (because either the IP header is directly |
| 360 | * contained, or IV/RFC1042 headers that have a length divisible by four are |
Kalle Valo | 59d9cb0 | 2009-12-17 13:54:57 +0100 | [diff] [blame] | 361 | * in front of it). If the payload data is not properly aligned and the |
| 362 | * architecture doesn't support efficient unaligned operations, mac80211 |
| 363 | * will align the data. |
Johannes Berg | d1c3a37 | 2009-01-07 00:26:10 +0100 | [diff] [blame] | 364 | * |
| 365 | * With A-MSDU frames, however, the payload data address must yield two modulo |
| 366 | * four because there are 14-byte 802.3 headers within the A-MSDU frames that |
| 367 | * push the IP header further back to a multiple of four again. Thankfully, the |
| 368 | * specs were sane enough this time around to require padding each A-MSDU |
| 369 | * subframe to a length that is a multiple of four. |
| 370 | * |
| 371 | * Padding like Atheros hardware adds which is inbetween the 802.11 header and |
| 372 | * the payload is not supported, the driver is required to move the 802.11 |
| 373 | * header to be directly in front of the payload in that case. |
| 374 | */ |
| 375 | static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx) |
Johannes Berg | 38f3714 | 2008-01-29 17:07:43 +0100 | [diff] [blame] | 376 | { |
Kalle Valo | 59d9cb0 | 2009-12-17 13:54:57 +0100 | [diff] [blame] | 377 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
| 378 | WARN_ONCE((unsigned long)rx->skb->data & 1, |
| 379 | "unaligned packet at 0x%p\n", rx->skb->data); |
Johannes Berg | d1c3a37 | 2009-01-07 00:26:10 +0100 | [diff] [blame] | 380 | #endif |
Johannes Berg | 6e0d114 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 381 | } |
| 382 | |
Ron Rindjunsky | 6368e4b | 2007-12-24 13:36:39 +0200 | [diff] [blame] | 383 | |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 384 | /* rx handlers */ |
| 385 | |
Johannes Berg | 4946162 | 2008-06-30 15:10:45 +0200 | [diff] [blame] | 386 | static ieee80211_rx_result debug_noinline |
Johannes Berg | 5cf121c | 2008-02-25 16:27:43 +0100 | [diff] [blame] | 387 | ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx) |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 388 | { |
| 389 | struct ieee80211_local *local = rx->local; |
| 390 | struct sk_buff *skb = rx->skb; |
| 391 | |
Helmut Schaa | fbe9c42 | 2009-07-23 12:14:04 +0200 | [diff] [blame] | 392 | if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning))) |
Johannes Berg | f1d58c2 | 2009-06-17 13:13:00 +0200 | [diff] [blame] | 393 | return ieee80211_scan_rx(rx->sdata, skb); |
Zhu Yi | ece8edd | 2007-11-22 10:53:21 +0800 | [diff] [blame] | 394 | |
Helmut Schaa | 142b9f5 | 2009-07-23 13:18:01 +0200 | [diff] [blame] | 395 | if (unlikely(test_bit(SCAN_SW_SCANNING, &local->scanning) && |
| 396 | (rx->flags & IEEE80211_RX_IN_SCAN))) { |
Zhu Yi | ece8edd | 2007-11-22 10:53:21 +0800 | [diff] [blame] | 397 | /* drop all the other packets during a software scan anyway */ |
Johannes Berg | f1d58c2 | 2009-06-17 13:13:00 +0200 | [diff] [blame] | 398 | if (ieee80211_scan_rx(rx->sdata, skb) != RX_QUEUED) |
Zhu Yi | ece8edd | 2007-11-22 10:53:21 +0800 | [diff] [blame] | 399 | dev_kfree_skb(skb); |
Johannes Berg | 9ae54c8 | 2008-01-31 19:48:20 +0100 | [diff] [blame] | 400 | return RX_QUEUED; |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 401 | } |
| 402 | |
Johannes Berg | 5cf121c | 2008-02-25 16:27:43 +0100 | [diff] [blame] | 403 | if (unlikely(rx->flags & IEEE80211_RX_IN_SCAN)) { |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 404 | /* scanning finished during invoking of handlers */ |
| 405 | I802_DEBUG_INC(local->rx_handlers_drop_passive_scan); |
Johannes Berg | e4c26ad | 2008-01-31 19:48:21 +0100 | [diff] [blame] | 406 | return RX_DROP_UNUSABLE; |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 407 | } |
| 408 | |
Johannes Berg | 9ae54c8 | 2008-01-31 19:48:20 +0100 | [diff] [blame] | 409 | return RX_CONTINUE; |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 410 | } |
| 411 | |
Jouni Malinen | 3cfcf6a | 2009-01-08 13:32:02 +0200 | [diff] [blame] | 412 | |
| 413 | static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb) |
| 414 | { |
| 415 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; |
| 416 | |
| 417 | if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1)) |
| 418 | return 0; |
| 419 | |
| 420 | return ieee80211_is_robust_mgmt_frame(hdr); |
| 421 | } |
| 422 | |
| 423 | |
| 424 | static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb) |
| 425 | { |
| 426 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; |
| 427 | |
| 428 | if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1)) |
| 429 | return 0; |
| 430 | |
| 431 | return ieee80211_is_robust_mgmt_frame(hdr); |
| 432 | } |
| 433 | |
| 434 | |
| 435 | /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */ |
| 436 | static int ieee80211_get_mmie_keyidx(struct sk_buff *skb) |
| 437 | { |
| 438 | struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data; |
| 439 | struct ieee80211_mmie *mmie; |
| 440 | |
| 441 | if (skb->len < 24 + sizeof(*mmie) || |
| 442 | !is_multicast_ether_addr(hdr->da)) |
| 443 | return -1; |
| 444 | |
| 445 | if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr)) |
| 446 | return -1; /* not a robust management frame */ |
| 447 | |
| 448 | mmie = (struct ieee80211_mmie *) |
| 449 | (skb->data + skb->len - sizeof(*mmie)); |
| 450 | if (mmie->element_id != WLAN_EID_MMIE || |
| 451 | mmie->length != sizeof(*mmie) - 2) |
| 452 | return -1; |
| 453 | |
| 454 | return le16_to_cpu(mmie->key_id); |
| 455 | } |
| 456 | |
| 457 | |
Luis Carlos Cobo | 33b64eb | 2008-02-23 15:17:10 +0100 | [diff] [blame] | 458 | static ieee80211_rx_result |
Johannes Berg | 5cf121c | 2008-02-25 16:27:43 +0100 | [diff] [blame] | 459 | ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx) |
Luis Carlos Cobo | 33b64eb | 2008-02-23 15:17:10 +0100 | [diff] [blame] | 460 | { |
Harvey Harrison | a7767f9 | 2008-07-02 16:30:51 -0700 | [diff] [blame] | 461 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
| 462 | unsigned int hdrlen = ieee80211_hdrlen(hdr->frame_control); |
Johannes Berg | 47846c9 | 2009-11-25 17:46:19 +0100 | [diff] [blame] | 463 | char *dev_addr = rx->sdata->vif.addr; |
Johannes Berg | d6d1a5a | 2008-02-25 16:24:38 +0100 | [diff] [blame] | 464 | |
Harvey Harrison | a7767f9 | 2008-07-02 16:30:51 -0700 | [diff] [blame] | 465 | if (ieee80211_is_data(hdr->frame_control)) { |
Javier Cardona | 3c5772a | 2009-08-10 12:15:48 -0700 | [diff] [blame] | 466 | if (is_multicast_ether_addr(hdr->addr1)) { |
| 467 | if (ieee80211_has_tods(hdr->frame_control) || |
| 468 | !ieee80211_has_fromds(hdr->frame_control)) |
| 469 | return RX_DROP_MONITOR; |
| 470 | if (memcmp(hdr->addr3, dev_addr, ETH_ALEN) == 0) |
| 471 | return RX_DROP_MONITOR; |
| 472 | } else { |
| 473 | if (!ieee80211_has_a4(hdr->frame_control)) |
| 474 | return RX_DROP_MONITOR; |
| 475 | if (memcmp(hdr->addr4, dev_addr, ETH_ALEN) == 0) |
| 476 | return RX_DROP_MONITOR; |
| 477 | } |
Luis Carlos Cobo | 33b64eb | 2008-02-23 15:17:10 +0100 | [diff] [blame] | 478 | } |
| 479 | |
| 480 | /* If there is not an established peer link and this is not a peer link |
| 481 | * establisment frame, beacon or probe, drop the frame. |
| 482 | */ |
| 483 | |
Luis Carlos Cobo | b4e08ea | 2008-02-29 15:46:08 -0800 | [diff] [blame] | 484 | if (!rx->sta || sta_plink_state(rx->sta) != PLINK_ESTAB) { |
Luis Carlos Cobo | 33b64eb | 2008-02-23 15:17:10 +0100 | [diff] [blame] | 485 | struct ieee80211_mgmt *mgmt; |
Johannes Berg | d6d1a5a | 2008-02-25 16:24:38 +0100 | [diff] [blame] | 486 | |
Harvey Harrison | a7767f9 | 2008-07-02 16:30:51 -0700 | [diff] [blame] | 487 | if (!ieee80211_is_mgmt(hdr->frame_control)) |
Luis Carlos Cobo | 33b64eb | 2008-02-23 15:17:10 +0100 | [diff] [blame] | 488 | return RX_DROP_MONITOR; |
| 489 | |
Harvey Harrison | a7767f9 | 2008-07-02 16:30:51 -0700 | [diff] [blame] | 490 | if (ieee80211_is_action(hdr->frame_control)) { |
Luis Carlos Cobo | 33b64eb | 2008-02-23 15:17:10 +0100 | [diff] [blame] | 491 | mgmt = (struct ieee80211_mgmt *)hdr; |
Javier Cardona | 97ad913 | 2010-03-29 11:00:21 -0700 | [diff] [blame] | 492 | if (mgmt->u.action.category != WLAN_CATEGORY_MESH_PLINK) |
Luis Carlos Cobo | 33b64eb | 2008-02-23 15:17:10 +0100 | [diff] [blame] | 493 | return RX_DROP_MONITOR; |
Luis Carlos Cobo | 33b64eb | 2008-02-23 15:17:10 +0100 | [diff] [blame] | 494 | return RX_CONTINUE; |
Luis Carlos Cobo | 33b64eb | 2008-02-23 15:17:10 +0100 | [diff] [blame] | 495 | } |
| 496 | |
Harvey Harrison | a7767f9 | 2008-07-02 16:30:51 -0700 | [diff] [blame] | 497 | if (ieee80211_is_probe_req(hdr->frame_control) || |
| 498 | ieee80211_is_probe_resp(hdr->frame_control) || |
| 499 | ieee80211_is_beacon(hdr->frame_control)) |
| 500 | return RX_CONTINUE; |
| 501 | |
| 502 | return RX_DROP_MONITOR; |
| 503 | |
| 504 | } |
| 505 | |
| 506 | #define msh_h_get(h, l) ((struct ieee80211s_hdr *) ((u8 *)h + l)) |
| 507 | |
| 508 | if (ieee80211_is_data(hdr->frame_control) && |
| 509 | is_multicast_ether_addr(hdr->addr1) && |
Javier Cardona | 3c5772a | 2009-08-10 12:15:48 -0700 | [diff] [blame] | 510 | mesh_rmc_check(hdr->addr3, msh_h_get(hdr, hdrlen), rx->sdata)) |
Luis Carlos Cobo | 33b64eb | 2008-02-23 15:17:10 +0100 | [diff] [blame] | 511 | return RX_DROP_MONITOR; |
Johannes Berg | 902acc7 | 2008-02-23 15:17:19 +0100 | [diff] [blame] | 512 | #undef msh_h_get |
Johannes Berg | d6d1a5a | 2008-02-25 16:24:38 +0100 | [diff] [blame] | 513 | |
Johannes Berg | 902acc7 | 2008-02-23 15:17:19 +0100 | [diff] [blame] | 514 | return RX_CONTINUE; |
| 515 | } |
Luis Carlos Cobo | 33b64eb | 2008-02-23 15:17:10 +0100 | [diff] [blame] | 516 | |
Johannes Berg | 1edfb1a | 2009-11-25 17:46:16 +0100 | [diff] [blame] | 517 | #define SEQ_MODULO 0x1000 |
| 518 | #define SEQ_MASK 0xfff |
| 519 | |
| 520 | static inline int seq_less(u16 sq1, u16 sq2) |
| 521 | { |
| 522 | return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1); |
| 523 | } |
| 524 | |
| 525 | static inline u16 seq_inc(u16 sq) |
| 526 | { |
| 527 | return (sq + 1) & SEQ_MASK; |
| 528 | } |
| 529 | |
| 530 | static inline u16 seq_sub(u16 sq1, u16 sq2) |
| 531 | { |
| 532 | return (sq1 - sq2) & SEQ_MASK; |
| 533 | } |
| 534 | |
| 535 | |
| 536 | static void ieee80211_release_reorder_frame(struct ieee80211_hw *hw, |
| 537 | struct tid_ampdu_rx *tid_agg_rx, |
Johannes Berg | 2569a82 | 2009-11-25 17:46:17 +0100 | [diff] [blame] | 538 | int index, |
| 539 | struct sk_buff_head *frames) |
Johannes Berg | 1edfb1a | 2009-11-25 17:46:16 +0100 | [diff] [blame] | 540 | { |
| 541 | struct ieee80211_supported_band *sband; |
| 542 | struct ieee80211_rate *rate = NULL; |
| 543 | struct sk_buff *skb = tid_agg_rx->reorder_buf[index]; |
| 544 | struct ieee80211_rx_status *status; |
| 545 | |
| 546 | if (!skb) |
| 547 | goto no_frame; |
| 548 | |
| 549 | status = IEEE80211_SKB_RXCB(skb); |
| 550 | |
| 551 | /* release the reordered frames to stack */ |
| 552 | sband = hw->wiphy->bands[status->band]; |
| 553 | if (!(status->flag & RX_FLAG_HT)) |
| 554 | rate = &sband->bitrates[status->rate_idx]; |
Johannes Berg | 1edfb1a | 2009-11-25 17:46:16 +0100 | [diff] [blame] | 555 | tid_agg_rx->stored_mpdu_num--; |
| 556 | tid_agg_rx->reorder_buf[index] = NULL; |
Johannes Berg | d29cecd | 2009-12-04 14:25:43 -0800 | [diff] [blame] | 557 | __skb_queue_tail(frames, skb); |
Johannes Berg | 1edfb1a | 2009-11-25 17:46:16 +0100 | [diff] [blame] | 558 | |
| 559 | no_frame: |
| 560 | tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num); |
| 561 | } |
| 562 | |
| 563 | static void ieee80211_release_reorder_frames(struct ieee80211_hw *hw, |
| 564 | struct tid_ampdu_rx *tid_agg_rx, |
Johannes Berg | 2569a82 | 2009-11-25 17:46:17 +0100 | [diff] [blame] | 565 | u16 head_seq_num, |
| 566 | struct sk_buff_head *frames) |
Johannes Berg | 1edfb1a | 2009-11-25 17:46:16 +0100 | [diff] [blame] | 567 | { |
| 568 | int index; |
| 569 | |
| 570 | while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) { |
| 571 | index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) % |
| 572 | tid_agg_rx->buf_size; |
Johannes Berg | 2569a82 | 2009-11-25 17:46:17 +0100 | [diff] [blame] | 573 | ieee80211_release_reorder_frame(hw, tid_agg_rx, index, frames); |
Johannes Berg | 1edfb1a | 2009-11-25 17:46:16 +0100 | [diff] [blame] | 574 | } |
| 575 | } |
| 576 | |
| 577 | /* |
| 578 | * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If |
| 579 | * the skb was added to the buffer longer than this time ago, the earlier |
| 580 | * frames that have not yet been received are assumed to be lost and the skb |
| 581 | * can be released for processing. This may also release other skb's from the |
| 582 | * reorder buffer if there are no additional gaps between the frames. |
| 583 | */ |
| 584 | #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10) |
| 585 | |
Christian Lamparter | aa0c863 | 2010-08-05 01:36:04 +0200 | [diff] [blame^] | 586 | static void ieee80211_sta_reorder_release(struct ieee80211_hw *hw, |
| 587 | struct tid_ampdu_rx *tid_agg_rx, |
| 588 | struct sk_buff_head *frames) |
| 589 | { |
| 590 | int index; |
| 591 | |
| 592 | /* release the buffer until next missing frame */ |
| 593 | index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) % |
| 594 | tid_agg_rx->buf_size; |
| 595 | if (!tid_agg_rx->reorder_buf[index] && |
| 596 | tid_agg_rx->stored_mpdu_num > 1) { |
| 597 | /* |
| 598 | * No buffers ready to be released, but check whether any |
| 599 | * frames in the reorder buffer have timed out. |
| 600 | */ |
| 601 | int j; |
| 602 | int skipped = 1; |
| 603 | for (j = (index + 1) % tid_agg_rx->buf_size; j != index; |
| 604 | j = (j + 1) % tid_agg_rx->buf_size) { |
| 605 | if (!tid_agg_rx->reorder_buf[j]) { |
| 606 | skipped++; |
| 607 | continue; |
| 608 | } |
| 609 | if (!time_after(jiffies, tid_agg_rx->reorder_time[j] + |
| 610 | HT_RX_REORDER_BUF_TIMEOUT)) |
| 611 | break; |
| 612 | |
| 613 | #ifdef CONFIG_MAC80211_HT_DEBUG |
| 614 | if (net_ratelimit()) |
| 615 | printk(KERN_DEBUG "%s: release an RX reorder " |
| 616 | "frame due to timeout on earlier " |
| 617 | "frames\n", |
| 618 | wiphy_name(hw->wiphy)); |
| 619 | #endif |
| 620 | ieee80211_release_reorder_frame(hw, tid_agg_rx, |
| 621 | j, frames); |
| 622 | |
| 623 | /* |
| 624 | * Increment the head seq# also for the skipped slots. |
| 625 | */ |
| 626 | tid_agg_rx->head_seq_num = |
| 627 | (tid_agg_rx->head_seq_num + skipped) & SEQ_MASK; |
| 628 | skipped = 0; |
| 629 | } |
| 630 | } else while (tid_agg_rx->reorder_buf[index]) { |
| 631 | ieee80211_release_reorder_frame(hw, tid_agg_rx, index, frames); |
| 632 | index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) % |
| 633 | tid_agg_rx->buf_size; |
| 634 | } |
| 635 | } |
| 636 | |
Johannes Berg | 1edfb1a | 2009-11-25 17:46:16 +0100 | [diff] [blame] | 637 | /* |
| 638 | * As this function belongs to the RX path it must be under |
| 639 | * rcu_read_lock protection. It returns false if the frame |
| 640 | * can be processed immediately, true if it was consumed. |
| 641 | */ |
| 642 | static bool ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw, |
| 643 | struct tid_ampdu_rx *tid_agg_rx, |
Johannes Berg | 2569a82 | 2009-11-25 17:46:17 +0100 | [diff] [blame] | 644 | struct sk_buff *skb, |
| 645 | struct sk_buff_head *frames) |
Johannes Berg | 1edfb1a | 2009-11-25 17:46:16 +0100 | [diff] [blame] | 646 | { |
| 647 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; |
| 648 | u16 sc = le16_to_cpu(hdr->seq_ctrl); |
| 649 | u16 mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4; |
| 650 | u16 head_seq_num, buf_size; |
| 651 | int index; |
| 652 | |
| 653 | buf_size = tid_agg_rx->buf_size; |
| 654 | head_seq_num = tid_agg_rx->head_seq_num; |
| 655 | |
| 656 | /* frame with out of date sequence number */ |
| 657 | if (seq_less(mpdu_seq_num, head_seq_num)) { |
| 658 | dev_kfree_skb(skb); |
| 659 | return true; |
| 660 | } |
| 661 | |
| 662 | /* |
| 663 | * If frame the sequence number exceeds our buffering window |
| 664 | * size release some previous frames to make room for this one. |
| 665 | */ |
| 666 | if (!seq_less(mpdu_seq_num, head_seq_num + buf_size)) { |
| 667 | head_seq_num = seq_inc(seq_sub(mpdu_seq_num, buf_size)); |
| 668 | /* release stored frames up to new head to stack */ |
Johannes Berg | 2569a82 | 2009-11-25 17:46:17 +0100 | [diff] [blame] | 669 | ieee80211_release_reorder_frames(hw, tid_agg_rx, head_seq_num, |
| 670 | frames); |
Johannes Berg | 1edfb1a | 2009-11-25 17:46:16 +0100 | [diff] [blame] | 671 | } |
| 672 | |
| 673 | /* Now the new frame is always in the range of the reordering buffer */ |
| 674 | |
| 675 | index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn) % tid_agg_rx->buf_size; |
| 676 | |
| 677 | /* check if we already stored this frame */ |
| 678 | if (tid_agg_rx->reorder_buf[index]) { |
| 679 | dev_kfree_skb(skb); |
| 680 | return true; |
| 681 | } |
| 682 | |
| 683 | /* |
| 684 | * If the current MPDU is in the right order and nothing else |
| 685 | * is stored we can process it directly, no need to buffer it. |
| 686 | */ |
| 687 | if (mpdu_seq_num == tid_agg_rx->head_seq_num && |
| 688 | tid_agg_rx->stored_mpdu_num == 0) { |
| 689 | tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num); |
| 690 | return false; |
| 691 | } |
| 692 | |
| 693 | /* put the frame in the reordering buffer */ |
| 694 | tid_agg_rx->reorder_buf[index] = skb; |
| 695 | tid_agg_rx->reorder_time[index] = jiffies; |
| 696 | tid_agg_rx->stored_mpdu_num++; |
Christian Lamparter | aa0c863 | 2010-08-05 01:36:04 +0200 | [diff] [blame^] | 697 | ieee80211_sta_reorder_release(hw, tid_agg_rx, frames); |
Johannes Berg | 1edfb1a | 2009-11-25 17:46:16 +0100 | [diff] [blame] | 698 | |
| 699 | return true; |
| 700 | } |
| 701 | |
| 702 | /* |
| 703 | * Reorder MPDUs from A-MPDUs, keeping them on a buffer. Returns |
| 704 | * true if the MPDU was buffered, false if it should be processed. |
| 705 | */ |
Johannes Berg | 2569a82 | 2009-11-25 17:46:17 +0100 | [diff] [blame] | 706 | static void ieee80211_rx_reorder_ampdu(struct ieee80211_rx_data *rx, |
| 707 | struct sk_buff_head *frames) |
Johannes Berg | 1edfb1a | 2009-11-25 17:46:16 +0100 | [diff] [blame] | 708 | { |
Johannes Berg | 2569a82 | 2009-11-25 17:46:17 +0100 | [diff] [blame] | 709 | struct sk_buff *skb = rx->skb; |
| 710 | struct ieee80211_local *local = rx->local; |
Johannes Berg | 1edfb1a | 2009-11-25 17:46:16 +0100 | [diff] [blame] | 711 | struct ieee80211_hw *hw = &local->hw; |
| 712 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; |
Johannes Berg | 2569a82 | 2009-11-25 17:46:17 +0100 | [diff] [blame] | 713 | struct sta_info *sta = rx->sta; |
Johannes Berg | 1edfb1a | 2009-11-25 17:46:16 +0100 | [diff] [blame] | 714 | struct tid_ampdu_rx *tid_agg_rx; |
| 715 | u16 sc; |
| 716 | int tid; |
| 717 | |
| 718 | if (!ieee80211_is_data_qos(hdr->frame_control)) |
Johannes Berg | 2569a82 | 2009-11-25 17:46:17 +0100 | [diff] [blame] | 719 | goto dont_reorder; |
Johannes Berg | 1edfb1a | 2009-11-25 17:46:16 +0100 | [diff] [blame] | 720 | |
| 721 | /* |
| 722 | * filter the QoS data rx stream according to |
| 723 | * STA/TID and check if this STA/TID is on aggregation |
| 724 | */ |
| 725 | |
Johannes Berg | 1edfb1a | 2009-11-25 17:46:16 +0100 | [diff] [blame] | 726 | if (!sta) |
Johannes Berg | 2569a82 | 2009-11-25 17:46:17 +0100 | [diff] [blame] | 727 | goto dont_reorder; |
Johannes Berg | 1edfb1a | 2009-11-25 17:46:16 +0100 | [diff] [blame] | 728 | |
| 729 | tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK; |
| 730 | |
Johannes Berg | a87f736 | 2010-06-10 10:21:38 +0200 | [diff] [blame] | 731 | tid_agg_rx = rcu_dereference(sta->ampdu_mlme.tid_rx[tid]); |
| 732 | if (!tid_agg_rx) |
| 733 | goto dont_reorder; |
Johannes Berg | 1edfb1a | 2009-11-25 17:46:16 +0100 | [diff] [blame] | 734 | |
| 735 | /* qos null data frames are excluded */ |
| 736 | if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC))) |
Johannes Berg | a87f736 | 2010-06-10 10:21:38 +0200 | [diff] [blame] | 737 | goto dont_reorder; |
Johannes Berg | 1edfb1a | 2009-11-25 17:46:16 +0100 | [diff] [blame] | 738 | |
| 739 | /* new, potentially un-ordered, ampdu frame - process it */ |
| 740 | |
| 741 | /* reset session timer */ |
| 742 | if (tid_agg_rx->timeout) |
| 743 | mod_timer(&tid_agg_rx->session_timer, |
| 744 | TU_TO_EXP_TIME(tid_agg_rx->timeout)); |
| 745 | |
| 746 | /* if this mpdu is fragmented - terminate rx aggregation session */ |
| 747 | sc = le16_to_cpu(hdr->seq_ctrl); |
| 748 | if (sc & IEEE80211_SCTL_FRAG) { |
Johannes Berg | c1475ca | 2010-06-10 10:21:37 +0200 | [diff] [blame] | 749 | skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME; |
Johannes Berg | 344eec6 | 2010-06-10 10:21:36 +0200 | [diff] [blame] | 750 | skb_queue_tail(&rx->sdata->skb_queue, skb); |
| 751 | ieee80211_queue_work(&local->hw, &rx->sdata->work); |
Johannes Berg | 2569a82 | 2009-11-25 17:46:17 +0100 | [diff] [blame] | 752 | return; |
Johannes Berg | 1edfb1a | 2009-11-25 17:46:16 +0100 | [diff] [blame] | 753 | } |
| 754 | |
Johannes Berg | a87f736 | 2010-06-10 10:21:38 +0200 | [diff] [blame] | 755 | /* |
| 756 | * No locking needed -- we will only ever process one |
| 757 | * RX packet at a time, and thus own tid_agg_rx. All |
| 758 | * other code manipulating it needs to (and does) make |
| 759 | * sure that we cannot get to it any more before doing |
| 760 | * anything with it. |
| 761 | */ |
| 762 | if (ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb, frames)) |
Johannes Berg | 2569a82 | 2009-11-25 17:46:17 +0100 | [diff] [blame] | 763 | return; |
| 764 | |
| 765 | dont_reorder: |
| 766 | __skb_queue_tail(frames, skb); |
Johannes Berg | 1edfb1a | 2009-11-25 17:46:16 +0100 | [diff] [blame] | 767 | } |
Luis Carlos Cobo | 33b64eb | 2008-02-23 15:17:10 +0100 | [diff] [blame] | 768 | |
Johannes Berg | 4946162 | 2008-06-30 15:10:45 +0200 | [diff] [blame] | 769 | static ieee80211_rx_result debug_noinline |
Johannes Berg | 5cf121c | 2008-02-25 16:27:43 +0100 | [diff] [blame] | 770 | ieee80211_rx_h_check(struct ieee80211_rx_data *rx) |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 771 | { |
Harvey Harrison | a7767f9 | 2008-07-02 16:30:51 -0700 | [diff] [blame] | 772 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 773 | |
| 774 | /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */ |
| 775 | if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) { |
Harvey Harrison | a7767f9 | 2008-07-02 16:30:51 -0700 | [diff] [blame] | 776 | if (unlikely(ieee80211_has_retry(hdr->frame_control) && |
Johannes Berg | 5cf121c | 2008-02-25 16:27:43 +0100 | [diff] [blame] | 777 | rx->sta->last_seq_ctrl[rx->queue] == |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 778 | hdr->seq_ctrl)) { |
Johannes Berg | 5cf121c | 2008-02-25 16:27:43 +0100 | [diff] [blame] | 779 | if (rx->flags & IEEE80211_RX_RA_MATCH) { |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 780 | rx->local->dot11FrameDuplicateCount++; |
| 781 | rx->sta->num_duplicates++; |
| 782 | } |
Johannes Berg | e4c26ad | 2008-01-31 19:48:21 +0100 | [diff] [blame] | 783 | return RX_DROP_MONITOR; |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 784 | } else |
Johannes Berg | 5cf121c | 2008-02-25 16:27:43 +0100 | [diff] [blame] | 785 | rx->sta->last_seq_ctrl[rx->queue] = hdr->seq_ctrl; |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 786 | } |
| 787 | |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 788 | if (unlikely(rx->skb->len < 16)) { |
| 789 | I802_DEBUG_INC(rx->local->rx_handlers_drop_short); |
Johannes Berg | e4c26ad | 2008-01-31 19:48:21 +0100 | [diff] [blame] | 790 | return RX_DROP_MONITOR; |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 791 | } |
| 792 | |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 793 | /* Drop disallowed frame classes based on STA auth/assoc state; |
| 794 | * IEEE 802.11, Chap 5.5. |
| 795 | * |
Johannes Berg | ccd7b36 | 2008-09-11 00:01:56 +0200 | [diff] [blame] | 796 | * mac80211 filters only based on association state, i.e. it drops |
| 797 | * Class 3 frames from not associated stations. hostapd sends |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 798 | * deauth/disassoc frames when needed. In addition, hostapd is |
| 799 | * responsible for filtering on both auth and assoc states. |
| 800 | */ |
Luis Carlos Cobo | 33b64eb | 2008-02-23 15:17:10 +0100 | [diff] [blame] | 801 | |
Johannes Berg | 902acc7 | 2008-02-23 15:17:19 +0100 | [diff] [blame] | 802 | if (ieee80211_vif_is_mesh(&rx->sdata->vif)) |
Luis Carlos Cobo | 33b64eb | 2008-02-23 15:17:10 +0100 | [diff] [blame] | 803 | return ieee80211_rx_mesh_check(rx); |
Luis Carlos Cobo | 33b64eb | 2008-02-23 15:17:10 +0100 | [diff] [blame] | 804 | |
Harvey Harrison | a7767f9 | 2008-07-02 16:30:51 -0700 | [diff] [blame] | 805 | if (unlikely((ieee80211_is_data(hdr->frame_control) || |
| 806 | ieee80211_is_pspoll(hdr->frame_control)) && |
Johannes Berg | 05c914f | 2008-09-11 00:01:58 +0200 | [diff] [blame] | 807 | rx->sdata->vif.type != NL80211_IFTYPE_ADHOC && |
Johannes Berg | 07346f81 | 2008-05-03 01:02:02 +0200 | [diff] [blame] | 808 | (!rx->sta || !test_sta_flags(rx->sta, WLAN_STA_ASSOC)))) { |
Harvey Harrison | a7767f9 | 2008-07-02 16:30:51 -0700 | [diff] [blame] | 809 | if ((!ieee80211_has_fromds(hdr->frame_control) && |
| 810 | !ieee80211_has_tods(hdr->frame_control) && |
| 811 | ieee80211_is_data(hdr->frame_control)) || |
| 812 | !(rx->flags & IEEE80211_RX_RA_MATCH)) { |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 813 | /* Drop IBSS frames and frames for other hosts |
| 814 | * silently. */ |
Johannes Berg | e4c26ad | 2008-01-31 19:48:21 +0100 | [diff] [blame] | 815 | return RX_DROP_MONITOR; |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 816 | } |
| 817 | |
Johannes Berg | e4c26ad | 2008-01-31 19:48:21 +0100 | [diff] [blame] | 818 | return RX_DROP_MONITOR; |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 819 | } |
| 820 | |
Johannes Berg | 9ae54c8 | 2008-01-31 19:48:20 +0100 | [diff] [blame] | 821 | return RX_CONTINUE; |
Johannes Berg | 570bd53 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 822 | } |
| 823 | |
| 824 | |
Johannes Berg | 4946162 | 2008-06-30 15:10:45 +0200 | [diff] [blame] | 825 | static ieee80211_rx_result debug_noinline |
Johannes Berg | 5cf121c | 2008-02-25 16:27:43 +0100 | [diff] [blame] | 826 | ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx) |
Johannes Berg | 570bd53 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 827 | { |
Johannes Berg | eb9fb5b | 2009-11-16 13:58:20 +0100 | [diff] [blame] | 828 | struct sk_buff *skb = rx->skb; |
| 829 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
| 830 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; |
Johannes Berg | 3017b80 | 2007-08-28 17:01:53 -0400 | [diff] [blame] | 831 | int keyidx; |
| 832 | int hdrlen; |
Johannes Berg | e4c26ad | 2008-01-31 19:48:21 +0100 | [diff] [blame] | 833 | ieee80211_rx_result result = RX_DROP_UNUSABLE; |
Johannes Berg | d4e46a3 | 2007-09-14 11:10:24 -0400 | [diff] [blame] | 834 | struct ieee80211_key *stakey = NULL; |
Jouni Malinen | 3cfcf6a | 2009-01-08 13:32:02 +0200 | [diff] [blame] | 835 | int mmie_keyidx = -1; |
Johannes Berg | 761ab47 | 2010-05-28 14:24:19 +0200 | [diff] [blame] | 836 | __le16 fc; |
Johannes Berg | 570bd53 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 837 | |
Johannes Berg | 3017b80 | 2007-08-28 17:01:53 -0400 | [diff] [blame] | 838 | /* |
| 839 | * Key selection 101 |
| 840 | * |
Jouni Malinen | 3cfcf6a | 2009-01-08 13:32:02 +0200 | [diff] [blame] | 841 | * There are four types of keys: |
Johannes Berg | 3017b80 | 2007-08-28 17:01:53 -0400 | [diff] [blame] | 842 | * - GTK (group keys) |
Jouni Malinen | 3cfcf6a | 2009-01-08 13:32:02 +0200 | [diff] [blame] | 843 | * - IGTK (group keys for management frames) |
Johannes Berg | 3017b80 | 2007-08-28 17:01:53 -0400 | [diff] [blame] | 844 | * - PTK (pairwise keys) |
| 845 | * - STK (station-to-station pairwise keys) |
| 846 | * |
| 847 | * When selecting a key, we have to distinguish between multicast |
| 848 | * (including broadcast) and unicast frames, the latter can only |
Jouni Malinen | 3cfcf6a | 2009-01-08 13:32:02 +0200 | [diff] [blame] | 849 | * use PTKs and STKs while the former always use GTKs and IGTKs. |
| 850 | * Unless, of course, actual WEP keys ("pre-RSNA") are used, then |
| 851 | * unicast frames can also use key indices like GTKs. Hence, if we |
| 852 | * don't have a PTK/STK we check the key index for a WEP key. |
Johannes Berg | 3017b80 | 2007-08-28 17:01:53 -0400 | [diff] [blame] | 853 | * |
Johannes Berg | 8dc06a1 | 2007-08-28 17:01:55 -0400 | [diff] [blame] | 854 | * Note that in a regular BSS, multicast frames are sent by the |
| 855 | * AP only, associated stations unicast the frame to the AP first |
| 856 | * which then multicasts it on their behalf. |
| 857 | * |
Johannes Berg | 3017b80 | 2007-08-28 17:01:53 -0400 | [diff] [blame] | 858 | * There is also a slight problem in IBSS mode: GTKs are negotiated |
| 859 | * with each station, that is something we don't currently handle. |
Johannes Berg | 8dc06a1 | 2007-08-28 17:01:55 -0400 | [diff] [blame] | 860 | * The spec seems to expect that one negotiates the same key with |
| 861 | * every station but there's no such requirement; VLANs could be |
| 862 | * possible. |
Johannes Berg | 3017b80 | 2007-08-28 17:01:53 -0400 | [diff] [blame] | 863 | */ |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 864 | |
Johannes Berg | 3017b80 | 2007-08-28 17:01:53 -0400 | [diff] [blame] | 865 | /* |
Johannes Berg | 1990af8 | 2007-09-26 17:53:15 +0200 | [diff] [blame] | 866 | * No point in finding a key and decrypting if the frame is neither |
Johannes Berg | 3017b80 | 2007-08-28 17:01:53 -0400 | [diff] [blame] | 867 | * addressed to us nor a multicast frame. |
| 868 | */ |
Johannes Berg | 5cf121c | 2008-02-25 16:27:43 +0100 | [diff] [blame] | 869 | if (!(rx->flags & IEEE80211_RX_RA_MATCH)) |
Johannes Berg | 9ae54c8 | 2008-01-31 19:48:20 +0100 | [diff] [blame] | 870 | return RX_CONTINUE; |
Johannes Berg | 3017b80 | 2007-08-28 17:01:53 -0400 | [diff] [blame] | 871 | |
Johannes Berg | 2569a82 | 2009-11-25 17:46:17 +0100 | [diff] [blame] | 872 | /* start without a key */ |
| 873 | rx->key = NULL; |
| 874 | |
Johannes Berg | d4e46a3 | 2007-09-14 11:10:24 -0400 | [diff] [blame] | 875 | if (rx->sta) |
| 876 | stakey = rcu_dereference(rx->sta->key); |
| 877 | |
Johannes Berg | 761ab47 | 2010-05-28 14:24:19 +0200 | [diff] [blame] | 878 | fc = hdr->frame_control; |
| 879 | |
| 880 | if (!ieee80211_has_protected(fc)) |
Jouni Malinen | 0c7c10c | 2009-05-08 12:34:10 +0300 | [diff] [blame] | 881 | mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb); |
| 882 | |
Johannes Berg | d4e46a3 | 2007-09-14 11:10:24 -0400 | [diff] [blame] | 883 | if (!is_multicast_ether_addr(hdr->addr1) && stakey) { |
| 884 | rx->key = stakey; |
Jouni Malinen | 0c7c10c | 2009-05-08 12:34:10 +0300 | [diff] [blame] | 885 | /* Skip decryption if the frame is not protected. */ |
Johannes Berg | 761ab47 | 2010-05-28 14:24:19 +0200 | [diff] [blame] | 886 | if (!ieee80211_has_protected(fc)) |
Jouni Malinen | 0c7c10c | 2009-05-08 12:34:10 +0300 | [diff] [blame] | 887 | return RX_CONTINUE; |
Jouni Malinen | 3cfcf6a | 2009-01-08 13:32:02 +0200 | [diff] [blame] | 888 | } else if (mmie_keyidx >= 0) { |
| 889 | /* Broadcast/multicast robust management frame / BIP */ |
Johannes Berg | eb9fb5b | 2009-11-16 13:58:20 +0100 | [diff] [blame] | 890 | if ((status->flag & RX_FLAG_DECRYPTED) && |
| 891 | (status->flag & RX_FLAG_IV_STRIPPED)) |
Jouni Malinen | 3cfcf6a | 2009-01-08 13:32:02 +0200 | [diff] [blame] | 892 | return RX_CONTINUE; |
| 893 | |
| 894 | if (mmie_keyidx < NUM_DEFAULT_KEYS || |
| 895 | mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS) |
| 896 | return RX_DROP_MONITOR; /* unexpected BIP keyidx */ |
| 897 | rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]); |
Johannes Berg | 761ab47 | 2010-05-28 14:24:19 +0200 | [diff] [blame] | 898 | } else if (!ieee80211_has_protected(fc)) { |
Jouni Malinen | 0c7c10c | 2009-05-08 12:34:10 +0300 | [diff] [blame] | 899 | /* |
| 900 | * The frame was not protected, so skip decryption. However, we |
| 901 | * need to set rx->key if there is a key that could have been |
| 902 | * used so that the frame may be dropped if encryption would |
| 903 | * have been expected. |
| 904 | */ |
| 905 | struct ieee80211_key *key = NULL; |
Johannes Berg | 761ab47 | 2010-05-28 14:24:19 +0200 | [diff] [blame] | 906 | if (ieee80211_is_mgmt(fc) && |
Jouni Malinen | 0c7c10c | 2009-05-08 12:34:10 +0300 | [diff] [blame] | 907 | is_multicast_ether_addr(hdr->addr1) && |
| 908 | (key = rcu_dereference(rx->sdata->default_mgmt_key))) |
| 909 | rx->key = key; |
| 910 | else if ((key = rcu_dereference(rx->sdata->default_key))) |
| 911 | rx->key = key; |
| 912 | return RX_CONTINUE; |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 913 | } else { |
Zhu Yi | 39184b1 | 2010-04-08 15:35:10 +0800 | [diff] [blame] | 914 | u8 keyid; |
Johannes Berg | 3017b80 | 2007-08-28 17:01:53 -0400 | [diff] [blame] | 915 | /* |
| 916 | * The device doesn't give us the IV so we won't be |
| 917 | * able to look up the key. That's ok though, we |
| 918 | * don't need to decrypt the frame, we just won't |
| 919 | * be able to keep statistics accurate. |
| 920 | * Except for key threshold notifications, should |
| 921 | * we somehow allow the driver to tell us which key |
| 922 | * the hardware used if this flag is set? |
| 923 | */ |
Johannes Berg | eb9fb5b | 2009-11-16 13:58:20 +0100 | [diff] [blame] | 924 | if ((status->flag & RX_FLAG_DECRYPTED) && |
| 925 | (status->flag & RX_FLAG_IV_STRIPPED)) |
Johannes Berg | 9ae54c8 | 2008-01-31 19:48:20 +0100 | [diff] [blame] | 926 | return RX_CONTINUE; |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 927 | |
Johannes Berg | 761ab47 | 2010-05-28 14:24:19 +0200 | [diff] [blame] | 928 | hdrlen = ieee80211_hdrlen(fc); |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 929 | |
Johannes Berg | 3017b80 | 2007-08-28 17:01:53 -0400 | [diff] [blame] | 930 | if (rx->skb->len < 8 + hdrlen) |
Johannes Berg | e4c26ad | 2008-01-31 19:48:21 +0100 | [diff] [blame] | 931 | return RX_DROP_UNUSABLE; /* TODO: count this? */ |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 932 | |
Johannes Berg | 3017b80 | 2007-08-28 17:01:53 -0400 | [diff] [blame] | 933 | /* |
| 934 | * no need to call ieee80211_wep_get_keyidx, |
| 935 | * it verifies a bunch of things we've done already |
| 936 | */ |
Zhu Yi | 39184b1 | 2010-04-08 15:35:10 +0800 | [diff] [blame] | 937 | skb_copy_bits(rx->skb, hdrlen + 3, &keyid, 1); |
| 938 | keyidx = keyid >> 6; |
Johannes Berg | 3017b80 | 2007-08-28 17:01:53 -0400 | [diff] [blame] | 939 | |
Johannes Berg | d4e46a3 | 2007-09-14 11:10:24 -0400 | [diff] [blame] | 940 | rx->key = rcu_dereference(rx->sdata->keys[keyidx]); |
Johannes Berg | 3017b80 | 2007-08-28 17:01:53 -0400 | [diff] [blame] | 941 | |
| 942 | /* |
| 943 | * RSNA-protected unicast frames should always be sent with |
| 944 | * pairwise or station-to-station keys, but for WEP we allow |
| 945 | * using a key index as well. |
| 946 | */ |
Johannes Berg | 8f20fc2 | 2007-08-28 17:01:54 -0400 | [diff] [blame] | 947 | if (rx->key && rx->key->conf.alg != ALG_WEP && |
Johannes Berg | 3017b80 | 2007-08-28 17:01:53 -0400 | [diff] [blame] | 948 | !is_multicast_ether_addr(hdr->addr1)) |
| 949 | rx->key = NULL; |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 950 | } |
| 951 | |
Johannes Berg | 3017b80 | 2007-08-28 17:01:53 -0400 | [diff] [blame] | 952 | if (rx->key) { |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 953 | rx->key->tx_rx_count++; |
Johannes Berg | 011bfcc | 2007-09-17 01:29:25 -0400 | [diff] [blame] | 954 | /* TODO: add threshold stuff again */ |
Johannes Berg | 1990af8 | 2007-09-26 17:53:15 +0200 | [diff] [blame] | 955 | } else { |
Johannes Berg | e4c26ad | 2008-01-31 19:48:21 +0100 | [diff] [blame] | 956 | return RX_DROP_MONITOR; |
Johannes Berg | 70f0876 | 2007-09-26 17:53:14 +0200 | [diff] [blame] | 957 | } |
| 958 | |
Zhu Yi | 39184b1 | 2010-04-08 15:35:10 +0800 | [diff] [blame] | 959 | if (skb_linearize(rx->skb)) |
| 960 | return RX_DROP_UNUSABLE; |
Johannes Berg | 761ab47 | 2010-05-28 14:24:19 +0200 | [diff] [blame] | 961 | /* the hdr variable is invalid now! */ |
Johannes Berg | 1990af8 | 2007-09-26 17:53:15 +0200 | [diff] [blame] | 962 | |
Johannes Berg | 70f0876 | 2007-09-26 17:53:14 +0200 | [diff] [blame] | 963 | switch (rx->key->conf.alg) { |
| 964 | case ALG_WEP: |
Johannes Berg | 761ab47 | 2010-05-28 14:24:19 +0200 | [diff] [blame] | 965 | /* Check for weak IVs if possible */ |
| 966 | if (rx->sta && ieee80211_is_data(fc) && |
| 967 | (!(status->flag & RX_FLAG_IV_STRIPPED) || |
| 968 | !(status->flag & RX_FLAG_DECRYPTED)) && |
| 969 | ieee80211_wep_is_weak_iv(rx->skb, rx->key)) |
| 970 | rx->sta->wep_weak_iv_count++; |
| 971 | |
Mattias Nissler | e2f036d | 2007-10-07 16:35:31 +0200 | [diff] [blame] | 972 | result = ieee80211_crypto_wep_decrypt(rx); |
| 973 | break; |
Johannes Berg | 70f0876 | 2007-09-26 17:53:14 +0200 | [diff] [blame] | 974 | case ALG_TKIP: |
Mattias Nissler | e2f036d | 2007-10-07 16:35:31 +0200 | [diff] [blame] | 975 | result = ieee80211_crypto_tkip_decrypt(rx); |
| 976 | break; |
Johannes Berg | 70f0876 | 2007-09-26 17:53:14 +0200 | [diff] [blame] | 977 | case ALG_CCMP: |
Mattias Nissler | e2f036d | 2007-10-07 16:35:31 +0200 | [diff] [blame] | 978 | result = ieee80211_crypto_ccmp_decrypt(rx); |
| 979 | break; |
Jouni Malinen | 3cfcf6a | 2009-01-08 13:32:02 +0200 | [diff] [blame] | 980 | case ALG_AES_CMAC: |
| 981 | result = ieee80211_crypto_aes_cmac_decrypt(rx); |
| 982 | break; |
Johannes Berg | 70f0876 | 2007-09-26 17:53:14 +0200 | [diff] [blame] | 983 | } |
| 984 | |
Mattias Nissler | e2f036d | 2007-10-07 16:35:31 +0200 | [diff] [blame] | 985 | /* either the frame has been decrypted or will be dropped */ |
Johannes Berg | eb9fb5b | 2009-11-16 13:58:20 +0100 | [diff] [blame] | 986 | status->flag |= RX_FLAG_DECRYPTED; |
Mattias Nissler | e2f036d | 2007-10-07 16:35:31 +0200 | [diff] [blame] | 987 | |
| 988 | return result; |
Johannes Berg | 70f0876 | 2007-09-26 17:53:14 +0200 | [diff] [blame] | 989 | } |
| 990 | |
Kalle Valo | 572e001 | 2009-02-10 17:09:31 +0200 | [diff] [blame] | 991 | static ieee80211_rx_result debug_noinline |
| 992 | ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx) |
| 993 | { |
| 994 | struct ieee80211_local *local; |
| 995 | struct ieee80211_hdr *hdr; |
| 996 | struct sk_buff *skb; |
| 997 | |
| 998 | local = rx->local; |
| 999 | skb = rx->skb; |
| 1000 | hdr = (struct ieee80211_hdr *) skb->data; |
| 1001 | |
| 1002 | if (!local->pspolling) |
| 1003 | return RX_CONTINUE; |
| 1004 | |
| 1005 | if (!ieee80211_has_fromds(hdr->frame_control)) |
| 1006 | /* this is not from AP */ |
| 1007 | return RX_CONTINUE; |
| 1008 | |
| 1009 | if (!ieee80211_is_data(hdr->frame_control)) |
| 1010 | return RX_CONTINUE; |
| 1011 | |
| 1012 | if (!ieee80211_has_moredata(hdr->frame_control)) { |
| 1013 | /* AP has no more frames buffered for us */ |
| 1014 | local->pspolling = false; |
| 1015 | return RX_CONTINUE; |
| 1016 | } |
| 1017 | |
| 1018 | /* more data bit is set, let's request a new frame from the AP */ |
| 1019 | ieee80211_send_pspoll(local, rx->sdata); |
| 1020 | |
| 1021 | return RX_CONTINUE; |
| 1022 | } |
| 1023 | |
Johannes Berg | 133b822 | 2008-09-16 14:18:59 +0200 | [diff] [blame] | 1024 | static void ap_sta_ps_start(struct sta_info *sta) |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 1025 | { |
Johannes Berg | 133b822 | 2008-09-16 14:18:59 +0200 | [diff] [blame] | 1026 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
Christian Lamparter | 4571d3b | 2008-11-30 00:48:41 +0100 | [diff] [blame] | 1027 | struct ieee80211_local *local = sdata->local; |
Joe Perches | 0795af5 | 2007-10-03 17:59:30 -0700 | [diff] [blame] | 1028 | |
Johannes Berg | 3e122be | 2008-07-09 14:40:34 +0200 | [diff] [blame] | 1029 | atomic_inc(&sdata->bss->num_sta_ps); |
Johannes Berg | af81858 | 2009-11-06 11:35:50 +0100 | [diff] [blame] | 1030 | set_sta_flags(sta, WLAN_STA_PS_STA); |
Johannes Berg | 12375ef | 2009-11-25 20:30:31 +0100 | [diff] [blame] | 1031 | drv_sta_notify(local, sdata, STA_NOTIFY_SLEEP, &sta->sta); |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 1032 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
Johannes Berg | 0c68ae26 | 2008-10-27 15:56:10 -0700 | [diff] [blame] | 1033 | printk(KERN_DEBUG "%s: STA %pM aid %d enters power save mode\n", |
Johannes Berg | 47846c9 | 2009-11-25 17:46:19 +0100 | [diff] [blame] | 1034 | sdata->name, sta->sta.addr, sta->sta.aid); |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 1035 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
| 1036 | } |
| 1037 | |
Johannes Berg | ff9458d | 2009-10-30 12:56:02 +0100 | [diff] [blame] | 1038 | static void ap_sta_ps_end(struct sta_info *sta) |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 1039 | { |
Johannes Berg | 133b822 | 2008-09-16 14:18:59 +0200 | [diff] [blame] | 1040 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 1041 | |
Johannes Berg | 3e122be | 2008-07-09 14:40:34 +0200 | [diff] [blame] | 1042 | atomic_dec(&sdata->bss->num_sta_ps); |
Johannes Berg | 004c872 | 2008-02-20 11:21:35 +0100 | [diff] [blame] | 1043 | |
Johannes Berg | af81858 | 2009-11-06 11:35:50 +0100 | [diff] [blame] | 1044 | clear_sta_flags(sta, WLAN_STA_PS_STA); |
Johannes Berg | 004c872 | 2008-02-20 11:21:35 +0100 | [diff] [blame] | 1045 | |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 1046 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
Johannes Berg | 0c68ae26 | 2008-10-27 15:56:10 -0700 | [diff] [blame] | 1047 | printk(KERN_DEBUG "%s: STA %pM aid %d exits power save mode\n", |
Johannes Berg | 47846c9 | 2009-11-25 17:46:19 +0100 | [diff] [blame] | 1048 | sdata->name, sta->sta.addr, sta->sta.aid); |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 1049 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
Johannes Berg | 004c872 | 2008-02-20 11:21:35 +0100 | [diff] [blame] | 1050 | |
Johannes Berg | af81858 | 2009-11-06 11:35:50 +0100 | [diff] [blame] | 1051 | if (test_sta_flags(sta, WLAN_STA_PS_DRIVER)) { |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 1052 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
Johannes Berg | af81858 | 2009-11-06 11:35:50 +0100 | [diff] [blame] | 1053 | printk(KERN_DEBUG "%s: STA %pM aid %d driver-ps-blocked\n", |
Johannes Berg | 47846c9 | 2009-11-25 17:46:19 +0100 | [diff] [blame] | 1054 | sdata->name, sta->sta.addr, sta->sta.aid); |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 1055 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
Johannes Berg | af81858 | 2009-11-06 11:35:50 +0100 | [diff] [blame] | 1056 | return; |
| 1057 | } |
| 1058 | |
| 1059 | ieee80211_sta_ps_deliver_wakeup(sta); |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 1060 | } |
| 1061 | |
Johannes Berg | 4946162 | 2008-06-30 15:10:45 +0200 | [diff] [blame] | 1062 | static ieee80211_rx_result debug_noinline |
Johannes Berg | 5cf121c | 2008-02-25 16:27:43 +0100 | [diff] [blame] | 1063 | ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx) |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 1064 | { |
| 1065 | struct sta_info *sta = rx->sta; |
Johannes Berg | eb9fb5b | 2009-11-16 13:58:20 +0100 | [diff] [blame] | 1066 | struct sk_buff *skb = rx->skb; |
| 1067 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
| 1068 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 1069 | |
| 1070 | if (!sta) |
Johannes Berg | 9ae54c8 | 2008-01-31 19:48:20 +0100 | [diff] [blame] | 1071 | return RX_CONTINUE; |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 1072 | |
Johannes Berg | b291ba1 | 2009-07-10 15:29:03 +0200 | [diff] [blame] | 1073 | /* |
| 1074 | * Update last_rx only for IBSS packets which are for the current |
| 1075 | * BSSID to avoid keeping the current IBSS network alive in cases |
| 1076 | * where other STAs start using different BSSID. |
| 1077 | */ |
Johannes Berg | 05c914f | 2008-09-11 00:01:58 +0200 | [diff] [blame] | 1078 | if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) { |
Ron Rindjunsky | 7136471 | 2007-12-25 17:00:36 +0200 | [diff] [blame] | 1079 | u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len, |
Johannes Berg | 05c914f | 2008-09-11 00:01:58 +0200 | [diff] [blame] | 1080 | NL80211_IFTYPE_ADHOC); |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 1081 | if (compare_ether_addr(bssid, rx->sdata->u.ibss.bssid) == 0) |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 1082 | sta->last_rx = jiffies; |
Johannes Berg | b291ba1 | 2009-07-10 15:29:03 +0200 | [diff] [blame] | 1083 | } else if (!is_multicast_ether_addr(hdr->addr1)) { |
| 1084 | /* |
Luis Carlos Cobo | 33b64eb | 2008-02-23 15:17:10 +0100 | [diff] [blame] | 1085 | * Mesh beacons will update last_rx when if they are found to |
| 1086 | * match the current local configuration when processed. |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 1087 | */ |
Johannes Berg | b291ba1 | 2009-07-10 15:29:03 +0200 | [diff] [blame] | 1088 | sta->last_rx = jiffies; |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 1089 | } |
| 1090 | |
Johannes Berg | 5cf121c | 2008-02-25 16:27:43 +0100 | [diff] [blame] | 1091 | if (!(rx->flags & IEEE80211_RX_RA_MATCH)) |
Johannes Berg | 9ae54c8 | 2008-01-31 19:48:20 +0100 | [diff] [blame] | 1092 | return RX_CONTINUE; |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 1093 | |
Kalle Valo | 3cf335d | 2009-03-22 21:57:06 +0200 | [diff] [blame] | 1094 | if (rx->sdata->vif.type == NL80211_IFTYPE_STATION) |
| 1095 | ieee80211_sta_rx_notify(rx->sdata, hdr); |
| 1096 | |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 1097 | sta->rx_fragments++; |
| 1098 | sta->rx_bytes += rx->skb->len; |
Johannes Berg | eb9fb5b | 2009-11-16 13:58:20 +0100 | [diff] [blame] | 1099 | sta->last_signal = status->signal; |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 1100 | |
Johannes Berg | 72eaa43 | 2008-11-26 15:02:58 +0100 | [diff] [blame] | 1101 | /* |
| 1102 | * Change STA power saving mode only at the end of a frame |
| 1103 | * exchange sequence. |
| 1104 | */ |
Johannes Berg | 3e122be | 2008-07-09 14:40:34 +0200 | [diff] [blame] | 1105 | if (!ieee80211_has_morefrags(hdr->frame_control) && |
Johannes Berg | 05c914f | 2008-09-11 00:01:58 +0200 | [diff] [blame] | 1106 | (rx->sdata->vif.type == NL80211_IFTYPE_AP || |
| 1107 | rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) { |
Johannes Berg | af81858 | 2009-11-06 11:35:50 +0100 | [diff] [blame] | 1108 | if (test_sta_flags(sta, WLAN_STA_PS_STA)) { |
Johannes Berg | 72eaa43 | 2008-11-26 15:02:58 +0100 | [diff] [blame] | 1109 | /* |
| 1110 | * Ignore doze->wake transitions that are |
| 1111 | * indicated by non-data frames, the standard |
| 1112 | * is unclear here, but for example going to |
| 1113 | * PS mode and then scanning would cause a |
| 1114 | * doze->wake transition for the probe request, |
| 1115 | * and that is clearly undesirable. |
| 1116 | */ |
| 1117 | if (ieee80211_is_data(hdr->frame_control) && |
| 1118 | !ieee80211_has_pm(hdr->frame_control)) |
Johannes Berg | ff9458d | 2009-10-30 12:56:02 +0100 | [diff] [blame] | 1119 | ap_sta_ps_end(sta); |
Johannes Berg | 72eaa43 | 2008-11-26 15:02:58 +0100 | [diff] [blame] | 1120 | } else { |
| 1121 | if (ieee80211_has_pm(hdr->frame_control)) |
| 1122 | ap_sta_ps_start(sta); |
| 1123 | } |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 1124 | } |
| 1125 | |
Johannes Berg | 22403de | 2009-10-30 12:55:03 +0100 | [diff] [blame] | 1126 | /* |
| 1127 | * Drop (qos-)data::nullfunc frames silently, since they |
| 1128 | * are used only to control station power saving mode. |
| 1129 | */ |
| 1130 | if (ieee80211_is_nullfunc(hdr->frame_control) || |
| 1131 | ieee80211_is_qos_nullfunc(hdr->frame_control)) { |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 1132 | I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc); |
Felix Fietkau | d524215 | 2010-01-08 18:06:26 +0100 | [diff] [blame] | 1133 | |
| 1134 | /* |
| 1135 | * If we receive a 4-addr nullfunc frame from a STA |
| 1136 | * that was not moved to a 4-addr STA vlan yet, drop |
| 1137 | * the frame to the monitor interface, to make sure |
| 1138 | * that hostapd sees it |
| 1139 | */ |
| 1140 | if (ieee80211_has_a4(hdr->frame_control) && |
| 1141 | (rx->sdata->vif.type == NL80211_IFTYPE_AP || |
| 1142 | (rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN && |
| 1143 | !rx->sdata->u.vlan.sta))) |
| 1144 | return RX_DROP_MONITOR; |
Johannes Berg | 22403de | 2009-10-30 12:55:03 +0100 | [diff] [blame] | 1145 | /* |
| 1146 | * Update counter and free packet here to avoid |
| 1147 | * counting this as a dropped packed. |
| 1148 | */ |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 1149 | sta->rx_packets++; |
| 1150 | dev_kfree_skb(rx->skb); |
Johannes Berg | 9ae54c8 | 2008-01-31 19:48:20 +0100 | [diff] [blame] | 1151 | return RX_QUEUED; |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 1152 | } |
| 1153 | |
Johannes Berg | 9ae54c8 | 2008-01-31 19:48:20 +0100 | [diff] [blame] | 1154 | return RX_CONTINUE; |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 1155 | } /* ieee80211_rx_h_sta_process */ |
| 1156 | |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 1157 | static inline struct ieee80211_fragment_entry * |
| 1158 | ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata, |
| 1159 | unsigned int frag, unsigned int seq, int rx_queue, |
| 1160 | struct sk_buff **skb) |
| 1161 | { |
| 1162 | struct ieee80211_fragment_entry *entry; |
| 1163 | int idx; |
| 1164 | |
| 1165 | idx = sdata->fragment_next; |
| 1166 | entry = &sdata->fragments[sdata->fragment_next++]; |
| 1167 | if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX) |
| 1168 | sdata->fragment_next = 0; |
| 1169 | |
| 1170 | if (!skb_queue_empty(&entry->skb_list)) { |
Johannes Berg | f4ea83d | 2008-06-30 15:10:46 +0200 | [diff] [blame] | 1171 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 1172 | struct ieee80211_hdr *hdr = |
| 1173 | (struct ieee80211_hdr *) entry->skb_list.next->data; |
| 1174 | printk(KERN_DEBUG "%s: RX reassembly removed oldest " |
| 1175 | "fragment entry (idx=%d age=%lu seq=%d last_frag=%d " |
Johannes Berg | 0c68ae26 | 2008-10-27 15:56:10 -0700 | [diff] [blame] | 1176 | "addr1=%pM addr2=%pM\n", |
Johannes Berg | 47846c9 | 2009-11-25 17:46:19 +0100 | [diff] [blame] | 1177 | sdata->name, idx, |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 1178 | jiffies - entry->first_frag_time, entry->seq, |
Johannes Berg | 0c68ae26 | 2008-10-27 15:56:10 -0700 | [diff] [blame] | 1179 | entry->last_frag, hdr->addr1, hdr->addr2); |
Johannes Berg | f4ea83d | 2008-06-30 15:10:46 +0200 | [diff] [blame] | 1180 | #endif |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 1181 | __skb_queue_purge(&entry->skb_list); |
| 1182 | } |
| 1183 | |
| 1184 | __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */ |
| 1185 | *skb = NULL; |
| 1186 | entry->first_frag_time = jiffies; |
| 1187 | entry->seq = seq; |
| 1188 | entry->rx_queue = rx_queue; |
| 1189 | entry->last_frag = frag; |
| 1190 | entry->ccmp = 0; |
| 1191 | entry->extra_len = 0; |
| 1192 | |
| 1193 | return entry; |
| 1194 | } |
| 1195 | |
| 1196 | static inline struct ieee80211_fragment_entry * |
| 1197 | ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata, |
Harvey Harrison | b73d70a | 2008-07-15 18:44:12 -0700 | [diff] [blame] | 1198 | unsigned int frag, unsigned int seq, |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 1199 | int rx_queue, struct ieee80211_hdr *hdr) |
| 1200 | { |
| 1201 | struct ieee80211_fragment_entry *entry; |
| 1202 | int i, idx; |
| 1203 | |
| 1204 | idx = sdata->fragment_next; |
| 1205 | for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) { |
| 1206 | struct ieee80211_hdr *f_hdr; |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 1207 | |
| 1208 | idx--; |
| 1209 | if (idx < 0) |
| 1210 | idx = IEEE80211_FRAGMENT_MAX - 1; |
| 1211 | |
| 1212 | entry = &sdata->fragments[idx]; |
| 1213 | if (skb_queue_empty(&entry->skb_list) || entry->seq != seq || |
| 1214 | entry->rx_queue != rx_queue || |
| 1215 | entry->last_frag + 1 != frag) |
| 1216 | continue; |
| 1217 | |
Harvey Harrison | b73d70a | 2008-07-15 18:44:12 -0700 | [diff] [blame] | 1218 | f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data; |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 1219 | |
Harvey Harrison | b73d70a | 2008-07-15 18:44:12 -0700 | [diff] [blame] | 1220 | /* |
| 1221 | * Check ftype and addresses are equal, else check next fragment |
| 1222 | */ |
| 1223 | if (((hdr->frame_control ^ f_hdr->frame_control) & |
| 1224 | cpu_to_le16(IEEE80211_FCTL_FTYPE)) || |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 1225 | compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 || |
| 1226 | compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0) |
| 1227 | continue; |
| 1228 | |
S.Çağlar Onur | ab46623 | 2008-02-14 17:36:47 +0200 | [diff] [blame] | 1229 | if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) { |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 1230 | __skb_queue_purge(&entry->skb_list); |
| 1231 | continue; |
| 1232 | } |
| 1233 | return entry; |
| 1234 | } |
| 1235 | |
| 1236 | return NULL; |
| 1237 | } |
| 1238 | |
Johannes Berg | 4946162 | 2008-06-30 15:10:45 +0200 | [diff] [blame] | 1239 | static ieee80211_rx_result debug_noinline |
Johannes Berg | 5cf121c | 2008-02-25 16:27:43 +0100 | [diff] [blame] | 1240 | ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx) |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 1241 | { |
| 1242 | struct ieee80211_hdr *hdr; |
| 1243 | u16 sc; |
Harvey Harrison | 358c8d9 | 2008-07-15 18:44:13 -0700 | [diff] [blame] | 1244 | __le16 fc; |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 1245 | unsigned int frag, seq; |
| 1246 | struct ieee80211_fragment_entry *entry; |
| 1247 | struct sk_buff *skb; |
| 1248 | |
Harvey Harrison | b73d70a | 2008-07-15 18:44:12 -0700 | [diff] [blame] | 1249 | hdr = (struct ieee80211_hdr *)rx->skb->data; |
Harvey Harrison | 358c8d9 | 2008-07-15 18:44:13 -0700 | [diff] [blame] | 1250 | fc = hdr->frame_control; |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 1251 | sc = le16_to_cpu(hdr->seq_ctrl); |
| 1252 | frag = sc & IEEE80211_SCTL_FRAG; |
| 1253 | |
Harvey Harrison | 358c8d9 | 2008-07-15 18:44:13 -0700 | [diff] [blame] | 1254 | if (likely((!ieee80211_has_morefrags(fc) && frag == 0) || |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 1255 | (rx->skb)->len < 24 || |
| 1256 | is_multicast_ether_addr(hdr->addr1))) { |
| 1257 | /* not fragmented */ |
| 1258 | goto out; |
| 1259 | } |
| 1260 | I802_DEBUG_INC(rx->local->rx_handlers_fragments); |
| 1261 | |
Zhu Yi | e3cf8b3 | 2010-03-29 17:35:07 +0800 | [diff] [blame] | 1262 | if (skb_linearize(rx->skb)) |
| 1263 | return RX_DROP_UNUSABLE; |
| 1264 | |
Abhijeet Kolekar | 058897a | 2010-05-11 11:22:11 -0700 | [diff] [blame] | 1265 | /* |
| 1266 | * skb_linearize() might change the skb->data and |
| 1267 | * previously cached variables (in this case, hdr) need to |
| 1268 | * be refreshed with the new data. |
| 1269 | */ |
| 1270 | hdr = (struct ieee80211_hdr *)rx->skb->data; |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 1271 | seq = (sc & IEEE80211_SCTL_SEQ) >> 4; |
| 1272 | |
| 1273 | if (frag == 0) { |
| 1274 | /* This is the first fragment of a new frame. */ |
| 1275 | entry = ieee80211_reassemble_add(rx->sdata, frag, seq, |
Johannes Berg | 5cf121c | 2008-02-25 16:27:43 +0100 | [diff] [blame] | 1276 | rx->queue, &(rx->skb)); |
Johannes Berg | 8f20fc2 | 2007-08-28 17:01:54 -0400 | [diff] [blame] | 1277 | if (rx->key && rx->key->conf.alg == ALG_CCMP && |
Harvey Harrison | 358c8d9 | 2008-07-15 18:44:13 -0700 | [diff] [blame] | 1278 | ieee80211_has_protected(fc)) { |
Jouni Malinen | 9190252 | 2010-06-11 10:27:33 -0700 | [diff] [blame] | 1279 | int queue = ieee80211_is_mgmt(fc) ? |
| 1280 | NUM_RX_DATA_QUEUES : rx->queue; |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 1281 | /* Store CCMP PN so that we can verify that the next |
| 1282 | * fragment has a sequential PN value. */ |
| 1283 | entry->ccmp = 1; |
| 1284 | memcpy(entry->last_pn, |
Jouni Malinen | 9190252 | 2010-06-11 10:27:33 -0700 | [diff] [blame] | 1285 | rx->key->u.ccmp.rx_pn[queue], |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 1286 | CCMP_PN_LEN); |
| 1287 | } |
Johannes Berg | 9ae54c8 | 2008-01-31 19:48:20 +0100 | [diff] [blame] | 1288 | return RX_QUEUED; |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 1289 | } |
| 1290 | |
| 1291 | /* This is a fragment for a frame that should already be pending in |
| 1292 | * fragment cache. Add this fragment to the end of the pending entry. |
| 1293 | */ |
Harvey Harrison | b73d70a | 2008-07-15 18:44:12 -0700 | [diff] [blame] | 1294 | entry = ieee80211_reassemble_find(rx->sdata, frag, seq, rx->queue, hdr); |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 1295 | if (!entry) { |
| 1296 | I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); |
Johannes Berg | e4c26ad | 2008-01-31 19:48:21 +0100 | [diff] [blame] | 1297 | return RX_DROP_MONITOR; |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 1298 | } |
| 1299 | |
| 1300 | /* Verify that MPDUs within one MSDU have sequential PN values. |
| 1301 | * (IEEE 802.11i, 8.3.3.4.5) */ |
| 1302 | if (entry->ccmp) { |
| 1303 | int i; |
| 1304 | u8 pn[CCMP_PN_LEN], *rpn; |
Jouni Malinen | 9190252 | 2010-06-11 10:27:33 -0700 | [diff] [blame] | 1305 | int queue; |
Johannes Berg | 8f20fc2 | 2007-08-28 17:01:54 -0400 | [diff] [blame] | 1306 | if (!rx->key || rx->key->conf.alg != ALG_CCMP) |
Johannes Berg | e4c26ad | 2008-01-31 19:48:21 +0100 | [diff] [blame] | 1307 | return RX_DROP_UNUSABLE; |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 1308 | memcpy(pn, entry->last_pn, CCMP_PN_LEN); |
| 1309 | for (i = CCMP_PN_LEN - 1; i >= 0; i--) { |
| 1310 | pn[i]++; |
| 1311 | if (pn[i]) |
| 1312 | break; |
| 1313 | } |
Jouni Malinen | 9190252 | 2010-06-11 10:27:33 -0700 | [diff] [blame] | 1314 | queue = ieee80211_is_mgmt(fc) ? |
| 1315 | NUM_RX_DATA_QUEUES : rx->queue; |
| 1316 | rpn = rx->key->u.ccmp.rx_pn[queue]; |
Johannes Berg | f4ea83d | 2008-06-30 15:10:46 +0200 | [diff] [blame] | 1317 | if (memcmp(pn, rpn, CCMP_PN_LEN)) |
Johannes Berg | e4c26ad | 2008-01-31 19:48:21 +0100 | [diff] [blame] | 1318 | return RX_DROP_UNUSABLE; |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 1319 | memcpy(entry->last_pn, pn, CCMP_PN_LEN); |
| 1320 | } |
| 1321 | |
Harvey Harrison | 358c8d9 | 2008-07-15 18:44:13 -0700 | [diff] [blame] | 1322 | skb_pull(rx->skb, ieee80211_hdrlen(fc)); |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 1323 | __skb_queue_tail(&entry->skb_list, rx->skb); |
| 1324 | entry->last_frag = frag; |
| 1325 | entry->extra_len += rx->skb->len; |
Harvey Harrison | 358c8d9 | 2008-07-15 18:44:13 -0700 | [diff] [blame] | 1326 | if (ieee80211_has_morefrags(fc)) { |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 1327 | rx->skb = NULL; |
Johannes Berg | 9ae54c8 | 2008-01-31 19:48:20 +0100 | [diff] [blame] | 1328 | return RX_QUEUED; |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 1329 | } |
| 1330 | |
| 1331 | rx->skb = __skb_dequeue(&entry->skb_list); |
| 1332 | if (skb_tailroom(rx->skb) < entry->extra_len) { |
| 1333 | I802_DEBUG_INC(rx->local->rx_expand_skb_head2); |
| 1334 | if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len, |
| 1335 | GFP_ATOMIC))) { |
| 1336 | I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); |
| 1337 | __skb_queue_purge(&entry->skb_list); |
Johannes Berg | e4c26ad | 2008-01-31 19:48:21 +0100 | [diff] [blame] | 1338 | return RX_DROP_UNUSABLE; |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 1339 | } |
| 1340 | } |
| 1341 | while ((skb = __skb_dequeue(&entry->skb_list))) { |
| 1342 | memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len); |
| 1343 | dev_kfree_skb(skb); |
| 1344 | } |
| 1345 | |
| 1346 | /* Complete frame has been reassembled - process it now */ |
Johannes Berg | 5cf121c | 2008-02-25 16:27:43 +0100 | [diff] [blame] | 1347 | rx->flags |= IEEE80211_RX_FRAGMENTED; |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 1348 | |
| 1349 | out: |
| 1350 | if (rx->sta) |
| 1351 | rx->sta->rx_packets++; |
| 1352 | if (is_multicast_ether_addr(hdr->addr1)) |
| 1353 | rx->local->dot11MulticastReceivedFrameCount++; |
| 1354 | else |
| 1355 | ieee80211_led_rx(rx->local); |
Johannes Berg | 9ae54c8 | 2008-01-31 19:48:20 +0100 | [diff] [blame] | 1356 | return RX_CONTINUE; |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 1357 | } |
| 1358 | |
Johannes Berg | 4946162 | 2008-06-30 15:10:45 +0200 | [diff] [blame] | 1359 | static ieee80211_rx_result debug_noinline |
Johannes Berg | 5cf121c | 2008-02-25 16:27:43 +0100 | [diff] [blame] | 1360 | ieee80211_rx_h_ps_poll(struct ieee80211_rx_data *rx) |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 1361 | { |
Johannes Berg | af81858 | 2009-11-06 11:35:50 +0100 | [diff] [blame] | 1362 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
Harvey Harrison | 358c8d9 | 2008-07-15 18:44:13 -0700 | [diff] [blame] | 1363 | __le16 fc = ((struct ieee80211_hdr *)rx->skb->data)->frame_control; |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 1364 | |
Harvey Harrison | 358c8d9 | 2008-07-15 18:44:13 -0700 | [diff] [blame] | 1365 | if (likely(!rx->sta || !ieee80211_is_pspoll(fc) || |
Johannes Berg | 5cf121c | 2008-02-25 16:27:43 +0100 | [diff] [blame] | 1366 | !(rx->flags & IEEE80211_RX_RA_MATCH))) |
Johannes Berg | 9ae54c8 | 2008-01-31 19:48:20 +0100 | [diff] [blame] | 1367 | return RX_CONTINUE; |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 1368 | |
Johannes Berg | 05c914f | 2008-09-11 00:01:58 +0200 | [diff] [blame] | 1369 | if ((sdata->vif.type != NL80211_IFTYPE_AP) && |
| 1370 | (sdata->vif.type != NL80211_IFTYPE_AP_VLAN)) |
Johannes Berg | e4c26ad | 2008-01-31 19:48:21 +0100 | [diff] [blame] | 1371 | return RX_DROP_UNUSABLE; |
Ron Rindjunsky | 98f0b0a | 2007-12-18 17:23:53 +0200 | [diff] [blame] | 1372 | |
Johannes Berg | af81858 | 2009-11-06 11:35:50 +0100 | [diff] [blame] | 1373 | if (!test_sta_flags(rx->sta, WLAN_STA_PS_DRIVER)) |
| 1374 | ieee80211_sta_ps_deliver_poll_response(rx->sta); |
| 1375 | else |
| 1376 | set_sta_flags(rx->sta, WLAN_STA_PSPOLL); |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 1377 | |
Johannes Berg | 9ae54c8 | 2008-01-31 19:48:20 +0100 | [diff] [blame] | 1378 | /* Free PS Poll skb here instead of returning RX_DROP that would |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 1379 | * count as an dropped frame. */ |
| 1380 | dev_kfree_skb(rx->skb); |
| 1381 | |
Johannes Berg | 9ae54c8 | 2008-01-31 19:48:20 +0100 | [diff] [blame] | 1382 | return RX_QUEUED; |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 1383 | } |
| 1384 | |
Johannes Berg | 4946162 | 2008-06-30 15:10:45 +0200 | [diff] [blame] | 1385 | static ieee80211_rx_result debug_noinline |
Johannes Berg | 5cf121c | 2008-02-25 16:27:43 +0100 | [diff] [blame] | 1386 | ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx) |
Johannes Berg | 6e0d114 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 1387 | { |
Johannes Berg | 6e0d114 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 1388 | u8 *data = rx->skb->data; |
Harvey Harrison | 238f74a | 2008-07-02 11:05:34 -0700 | [diff] [blame] | 1389 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data; |
Johannes Berg | 6e0d114 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 1390 | |
Harvey Harrison | 238f74a | 2008-07-02 11:05:34 -0700 | [diff] [blame] | 1391 | if (!ieee80211_is_data_qos(hdr->frame_control)) |
Johannes Berg | 9ae54c8 | 2008-01-31 19:48:20 +0100 | [diff] [blame] | 1392 | return RX_CONTINUE; |
Johannes Berg | 6e0d114 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 1393 | |
| 1394 | /* remove the qos control field, update frame type and meta-data */ |
Harvey Harrison | 238f74a | 2008-07-02 11:05:34 -0700 | [diff] [blame] | 1395 | memmove(data + IEEE80211_QOS_CTL_LEN, data, |
| 1396 | ieee80211_hdrlen(hdr->frame_control) - IEEE80211_QOS_CTL_LEN); |
| 1397 | hdr = (struct ieee80211_hdr *)skb_pull(rx->skb, IEEE80211_QOS_CTL_LEN); |
Johannes Berg | 6e0d114 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 1398 | /* change frame type to non QOS */ |
Harvey Harrison | 238f74a | 2008-07-02 11:05:34 -0700 | [diff] [blame] | 1399 | hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA); |
Johannes Berg | 6e0d114 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 1400 | |
Johannes Berg | 9ae54c8 | 2008-01-31 19:48:20 +0100 | [diff] [blame] | 1401 | return RX_CONTINUE; |
Johannes Berg | 6e0d114 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 1402 | } |
| 1403 | |
Ron Rindjunsky | 76ee65b | 2007-11-22 19:49:12 +0200 | [diff] [blame] | 1404 | static int |
Johannes Berg | 5cf121c | 2008-02-25 16:27:43 +0100 | [diff] [blame] | 1405 | ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx) |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 1406 | { |
Johannes Berg | 07346f81 | 2008-05-03 01:02:02 +0200 | [diff] [blame] | 1407 | if (unlikely(!rx->sta || |
Johannes Berg | f4ea83d | 2008-06-30 15:10:46 +0200 | [diff] [blame] | 1408 | !test_sta_flags(rx->sta, WLAN_STA_AUTHORIZED))) |
Ron Rindjunsky | 76ee65b | 2007-11-22 19:49:12 +0200 | [diff] [blame] | 1409 | return -EACCES; |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 1410 | |
Ron Rindjunsky | 76ee65b | 2007-11-22 19:49:12 +0200 | [diff] [blame] | 1411 | return 0; |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 1412 | } |
| 1413 | |
Ron Rindjunsky | 76ee65b | 2007-11-22 19:49:12 +0200 | [diff] [blame] | 1414 | static int |
Harvey Harrison | 358c8d9 | 2008-07-15 18:44:13 -0700 | [diff] [blame] | 1415 | ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc) |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 1416 | { |
Johannes Berg | eb9fb5b | 2009-11-16 13:58:20 +0100 | [diff] [blame] | 1417 | struct sk_buff *skb = rx->skb; |
| 1418 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
| 1419 | |
Johannes Berg | 3017b80 | 2007-08-28 17:01:53 -0400 | [diff] [blame] | 1420 | /* |
Johannes Berg | 7848ba7 | 2007-09-14 11:10:25 -0400 | [diff] [blame] | 1421 | * Pass through unencrypted frames if the hardware has |
| 1422 | * decrypted them already. |
Johannes Berg | 3017b80 | 2007-08-28 17:01:53 -0400 | [diff] [blame] | 1423 | */ |
Johannes Berg | eb9fb5b | 2009-11-16 13:58:20 +0100 | [diff] [blame] | 1424 | if (status->flag & RX_FLAG_DECRYPTED) |
Ron Rindjunsky | 76ee65b | 2007-11-22 19:49:12 +0200 | [diff] [blame] | 1425 | return 0; |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 1426 | |
| 1427 | /* Drop unencrypted frames if key is set. */ |
Harvey Harrison | 358c8d9 | 2008-07-15 18:44:13 -0700 | [diff] [blame] | 1428 | if (unlikely(!ieee80211_has_protected(fc) && |
| 1429 | !ieee80211_is_nullfunc(fc) && |
Jouni Malinen | f2ca3ea4 | 2009-05-08 12:36:03 +0300 | [diff] [blame] | 1430 | ieee80211_is_data(fc) && |
Jouni Malinen | 3cfcf6a | 2009-01-08 13:32:02 +0200 | [diff] [blame] | 1431 | (rx->key || rx->sdata->drop_unencrypted))) |
| 1432 | return -EACCES; |
Johannes Berg | bef5d1c | 2010-02-16 11:05:00 +0100 | [diff] [blame] | 1433 | |
| 1434 | return 0; |
| 1435 | } |
| 1436 | |
| 1437 | static int |
| 1438 | ieee80211_drop_unencrypted_mgmt(struct ieee80211_rx_data *rx) |
| 1439 | { |
| 1440 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
Jouni Malinen | e3efca0 | 2010-03-28 22:31:15 -0700 | [diff] [blame] | 1441 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(rx->skb); |
Johannes Berg | bef5d1c | 2010-02-16 11:05:00 +0100 | [diff] [blame] | 1442 | __le16 fc = hdr->frame_control; |
Johannes Berg | bef5d1c | 2010-02-16 11:05:00 +0100 | [diff] [blame] | 1443 | |
Jouni Malinen | e3efca0 | 2010-03-28 22:31:15 -0700 | [diff] [blame] | 1444 | /* |
| 1445 | * Pass through unencrypted frames if the hardware has |
| 1446 | * decrypted them already. |
| 1447 | */ |
| 1448 | if (status->flag & RX_FLAG_DECRYPTED) |
| 1449 | return 0; |
Johannes Berg | bef5d1c | 2010-02-16 11:05:00 +0100 | [diff] [blame] | 1450 | |
Jouni Malinen | f2ca3ea4 | 2009-05-08 12:36:03 +0300 | [diff] [blame] | 1451 | if (rx->sta && test_sta_flags(rx->sta, WLAN_STA_MFP)) { |
Jouni Malinen | d211e90 | 2010-03-28 22:29:52 -0700 | [diff] [blame] | 1452 | if (unlikely(!ieee80211_has_protected(fc) && |
| 1453 | ieee80211_is_unicast_robust_mgmt_frame(rx->skb) && |
Jouni Malinen | f2ca3ea4 | 2009-05-08 12:36:03 +0300 | [diff] [blame] | 1454 | rx->key)) |
| 1455 | return -EACCES; |
| 1456 | /* BIP does not use Protected field, so need to check MMIE */ |
Joe Perches | f64f9e7 | 2009-11-29 16:55:45 -0800 | [diff] [blame] | 1457 | if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) && |
Jouni Malinen | fa83a21 | 2010-03-29 23:36:15 -0700 | [diff] [blame] | 1458 | ieee80211_get_mmie_keyidx(rx->skb) < 0)) |
Jouni Malinen | f2ca3ea4 | 2009-05-08 12:36:03 +0300 | [diff] [blame] | 1459 | return -EACCES; |
| 1460 | /* |
| 1461 | * When using MFP, Action frames are not allowed prior to |
| 1462 | * having configured keys. |
| 1463 | */ |
| 1464 | if (unlikely(ieee80211_is_action(fc) && !rx->key && |
| 1465 | ieee80211_is_robust_mgmt_frame( |
| 1466 | (struct ieee80211_hdr *) rx->skb->data))) |
| 1467 | return -EACCES; |
| 1468 | } |
Johannes Berg | b3fc9c6 | 2008-04-13 10:12:47 +0200 | [diff] [blame] | 1469 | |
Ron Rindjunsky | 76ee65b | 2007-11-22 19:49:12 +0200 | [diff] [blame] | 1470 | return 0; |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 1471 | } |
| 1472 | |
Ron Rindjunsky | 76ee65b | 2007-11-22 19:49:12 +0200 | [diff] [blame] | 1473 | static int |
Zhu Yi | e31a16d | 2009-05-21 21:47:03 +0800 | [diff] [blame] | 1474 | __ieee80211_data_to_8023(struct ieee80211_rx_data *rx) |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 1475 | { |
Johannes Berg | eb9fb5b | 2009-11-16 13:58:20 +0100 | [diff] [blame] | 1476 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
Felix Fietkau | f14543e | 2009-11-10 20:10:05 +0100 | [diff] [blame] | 1477 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
| 1478 | |
Johannes Berg | 9bc383d | 2009-11-19 11:55:19 +0100 | [diff] [blame] | 1479 | if (ieee80211_has_a4(hdr->frame_control) && |
| 1480 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN && !sdata->u.vlan.sta) |
Felix Fietkau | f14543e | 2009-11-10 20:10:05 +0100 | [diff] [blame] | 1481 | return -1; |
Johannes Berg | 9bc383d | 2009-11-19 11:55:19 +0100 | [diff] [blame] | 1482 | |
| 1483 | if (is_multicast_ether_addr(hdr->addr1) && |
| 1484 | ((sdata->vif.type == NL80211_IFTYPE_AP_VLAN && sdata->u.vlan.sta) || |
| 1485 | (sdata->vif.type == NL80211_IFTYPE_STATION && sdata->u.mgd.use_4addr))) |
Felix Fietkau | f14543e | 2009-11-10 20:10:05 +0100 | [diff] [blame] | 1486 | return -1; |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 1487 | |
Johannes Berg | 47846c9 | 2009-11-25 17:46:19 +0100 | [diff] [blame] | 1488 | return ieee80211_data_to_8023(rx->skb, sdata->vif.addr, sdata->vif.type); |
Ron Rindjunsky | 76ee65b | 2007-11-22 19:49:12 +0200 | [diff] [blame] | 1489 | } |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 1490 | |
Johannes Berg | ce3edf6d0 | 2007-12-19 01:31:22 +0100 | [diff] [blame] | 1491 | /* |
| 1492 | * requires that rx->skb is a frame with ethernet header |
| 1493 | */ |
Harvey Harrison | 358c8d9 | 2008-07-15 18:44:13 -0700 | [diff] [blame] | 1494 | static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc) |
Johannes Berg | ce3edf6d0 | 2007-12-19 01:31:22 +0100 | [diff] [blame] | 1495 | { |
Senthil Balasubramanian | c97c23e | 2008-05-28 23:15:32 +0530 | [diff] [blame] | 1496 | static const u8 pae_group_addr[ETH_ALEN] __aligned(2) |
Johannes Berg | ce3edf6d0 | 2007-12-19 01:31:22 +0100 | [diff] [blame] | 1497 | = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 }; |
| 1498 | struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data; |
| 1499 | |
| 1500 | /* |
| 1501 | * Allow EAPOL frames to us/the PAE group address regardless |
| 1502 | * of whether the frame was encrypted or not. |
| 1503 | */ |
| 1504 | if (ehdr->h_proto == htons(ETH_P_PAE) && |
Johannes Berg | 47846c9 | 2009-11-25 17:46:19 +0100 | [diff] [blame] | 1505 | (compare_ether_addr(ehdr->h_dest, rx->sdata->vif.addr) == 0 || |
Johannes Berg | ce3edf6d0 | 2007-12-19 01:31:22 +0100 | [diff] [blame] | 1506 | compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0)) |
| 1507 | return true; |
| 1508 | |
| 1509 | if (ieee80211_802_1x_port_control(rx) || |
Harvey Harrison | 358c8d9 | 2008-07-15 18:44:13 -0700 | [diff] [blame] | 1510 | ieee80211_drop_unencrypted(rx, fc)) |
Johannes Berg | ce3edf6d0 | 2007-12-19 01:31:22 +0100 | [diff] [blame] | 1511 | return false; |
| 1512 | |
| 1513 | return true; |
| 1514 | } |
| 1515 | |
| 1516 | /* |
| 1517 | * requires that rx->skb is a frame with ethernet header |
| 1518 | */ |
Ron Rindjunsky | 76ee65b | 2007-11-22 19:49:12 +0200 | [diff] [blame] | 1519 | static void |
Johannes Berg | 5cf121c | 2008-02-25 16:27:43 +0100 | [diff] [blame] | 1520 | ieee80211_deliver_skb(struct ieee80211_rx_data *rx) |
Ron Rindjunsky | 76ee65b | 2007-11-22 19:49:12 +0200 | [diff] [blame] | 1521 | { |
Johannes Berg | eb9fb5b | 2009-11-16 13:58:20 +0100 | [diff] [blame] | 1522 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
| 1523 | struct net_device *dev = sdata->dev; |
Ron Rindjunsky | 76ee65b | 2007-11-22 19:49:12 +0200 | [diff] [blame] | 1524 | struct sk_buff *skb, *xmit_skb; |
Johannes Berg | ce3edf6d0 | 2007-12-19 01:31:22 +0100 | [diff] [blame] | 1525 | struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data; |
| 1526 | struct sta_info *dsta; |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 1527 | |
Ron Rindjunsky | 76ee65b | 2007-11-22 19:49:12 +0200 | [diff] [blame] | 1528 | skb = rx->skb; |
| 1529 | xmit_skb = NULL; |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 1530 | |
Johannes Berg | 05c914f | 2008-09-11 00:01:58 +0200 | [diff] [blame] | 1531 | if ((sdata->vif.type == NL80211_IFTYPE_AP || |
| 1532 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN) && |
Johannes Berg | 213cd11 | 2008-09-11 00:01:54 +0200 | [diff] [blame] | 1533 | !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) && |
Johannes Berg | 9bc383d | 2009-11-19 11:55:19 +0100 | [diff] [blame] | 1534 | (rx->flags & IEEE80211_RX_RA_MATCH) && |
| 1535 | (sdata->vif.type != NL80211_IFTYPE_AP_VLAN || !sdata->u.vlan.sta)) { |
Johannes Berg | ce3edf6d0 | 2007-12-19 01:31:22 +0100 | [diff] [blame] | 1536 | if (is_multicast_ether_addr(ehdr->h_dest)) { |
| 1537 | /* |
| 1538 | * send multicast frames both to higher layers in |
| 1539 | * local net stack and back to the wireless medium |
| 1540 | */ |
Ron Rindjunsky | 76ee65b | 2007-11-22 19:49:12 +0200 | [diff] [blame] | 1541 | xmit_skb = skb_copy(skb, GFP_ATOMIC); |
| 1542 | if (!xmit_skb && net_ratelimit()) |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 1543 | printk(KERN_DEBUG "%s: failed to clone " |
| 1544 | "multicast frame\n", dev->name); |
| 1545 | } else { |
Johannes Berg | abe6063 | 2009-11-25 17:46:18 +0100 | [diff] [blame] | 1546 | dsta = sta_info_get(sdata, skb->data); |
| 1547 | if (dsta) { |
Johannes Berg | ce3edf6d0 | 2007-12-19 01:31:22 +0100 | [diff] [blame] | 1548 | /* |
| 1549 | * The destination station is associated to |
| 1550 | * this AP (in this VLAN), so send the frame |
| 1551 | * directly to it and do not pass it to local |
| 1552 | * net stack. |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 1553 | */ |
Ron Rindjunsky | 76ee65b | 2007-11-22 19:49:12 +0200 | [diff] [blame] | 1554 | xmit_skb = skb; |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 1555 | skb = NULL; |
| 1556 | } |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 1557 | } |
| 1558 | } |
| 1559 | |
| 1560 | if (skb) { |
Johannes Berg | d1c3a37 | 2009-01-07 00:26:10 +0100 | [diff] [blame] | 1561 | int align __maybe_unused; |
| 1562 | |
Kalle Valo | 59d9cb0 | 2009-12-17 13:54:57 +0100 | [diff] [blame] | 1563 | #ifndef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS |
Johannes Berg | d1c3a37 | 2009-01-07 00:26:10 +0100 | [diff] [blame] | 1564 | /* |
| 1565 | * 'align' will only take the values 0 or 2 here |
| 1566 | * since all frames are required to be aligned |
| 1567 | * to 2-byte boundaries when being passed to |
| 1568 | * mac80211. That also explains the __skb_push() |
| 1569 | * below. |
| 1570 | */ |
matthieu castet | dacb6f1 | 2009-06-04 22:16:18 +0200 | [diff] [blame] | 1571 | align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3; |
Johannes Berg | d1c3a37 | 2009-01-07 00:26:10 +0100 | [diff] [blame] | 1572 | if (align) { |
| 1573 | if (WARN_ON(skb_headroom(skb) < 3)) { |
| 1574 | dev_kfree_skb(skb); |
| 1575 | skb = NULL; |
| 1576 | } else { |
| 1577 | u8 *data = skb->data; |
Zhu Yi | 8ce0b58 | 2009-10-28 13:13:52 -0700 | [diff] [blame] | 1578 | size_t len = skb_headlen(skb); |
| 1579 | skb->data -= align; |
| 1580 | memmove(skb->data, data, len); |
| 1581 | skb_set_tail_pointer(skb, len); |
Johannes Berg | d1c3a37 | 2009-01-07 00:26:10 +0100 | [diff] [blame] | 1582 | } |
| 1583 | } |
| 1584 | #endif |
| 1585 | |
| 1586 | if (skb) { |
| 1587 | /* deliver to local stack */ |
| 1588 | skb->protocol = eth_type_trans(skb, dev); |
| 1589 | memset(skb->cb, 0, sizeof(skb->cb)); |
John W. Linville | 5548a8a | 2010-06-24 14:25:56 -0400 | [diff] [blame] | 1590 | netif_receive_skb(skb); |
Johannes Berg | d1c3a37 | 2009-01-07 00:26:10 +0100 | [diff] [blame] | 1591 | } |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 1592 | } |
| 1593 | |
Ron Rindjunsky | 76ee65b | 2007-11-22 19:49:12 +0200 | [diff] [blame] | 1594 | if (xmit_skb) { |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 1595 | /* send to wireless media */ |
YOSHIFUJI Hideaki | f831e90 | 2007-12-12 03:54:23 +0900 | [diff] [blame] | 1596 | xmit_skb->protocol = htons(ETH_P_802_3); |
Johannes Berg | ce3edf6d0 | 2007-12-19 01:31:22 +0100 | [diff] [blame] | 1597 | skb_reset_network_header(xmit_skb); |
| 1598 | skb_reset_mac_header(xmit_skb); |
Ron Rindjunsky | 76ee65b | 2007-11-22 19:49:12 +0200 | [diff] [blame] | 1599 | dev_queue_xmit(xmit_skb); |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 1600 | } |
Ron Rindjunsky | 76ee65b | 2007-11-22 19:49:12 +0200 | [diff] [blame] | 1601 | } |
| 1602 | |
Johannes Berg | 4946162 | 2008-06-30 15:10:45 +0200 | [diff] [blame] | 1603 | static ieee80211_rx_result debug_noinline |
Johannes Berg | 5cf121c | 2008-02-25 16:27:43 +0100 | [diff] [blame] | 1604 | ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx) |
Ron Rindjunsky | fd4c7f2 | 2007-11-26 16:14:33 +0200 | [diff] [blame] | 1605 | { |
Johannes Berg | eb9fb5b | 2009-11-16 13:58:20 +0100 | [diff] [blame] | 1606 | struct net_device *dev = rx->sdata->dev; |
Zhu Yi | eaf85ca | 2009-12-01 10:18:37 +0800 | [diff] [blame] | 1607 | struct sk_buff *skb = rx->skb; |
Harvey Harrison | 358c8d9 | 2008-07-15 18:44:13 -0700 | [diff] [blame] | 1608 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; |
| 1609 | __le16 fc = hdr->frame_control; |
Zhu Yi | eaf85ca | 2009-12-01 10:18:37 +0800 | [diff] [blame] | 1610 | struct sk_buff_head frame_list; |
Ron Rindjunsky | fd4c7f2 | 2007-11-26 16:14:33 +0200 | [diff] [blame] | 1611 | |
Harvey Harrison | 358c8d9 | 2008-07-15 18:44:13 -0700 | [diff] [blame] | 1612 | if (unlikely(!ieee80211_is_data(fc))) |
Johannes Berg | 9ae54c8 | 2008-01-31 19:48:20 +0100 | [diff] [blame] | 1613 | return RX_CONTINUE; |
Ron Rindjunsky | fd4c7f2 | 2007-11-26 16:14:33 +0200 | [diff] [blame] | 1614 | |
Harvey Harrison | 358c8d9 | 2008-07-15 18:44:13 -0700 | [diff] [blame] | 1615 | if (unlikely(!ieee80211_is_data_present(fc))) |
Johannes Berg | e4c26ad | 2008-01-31 19:48:21 +0100 | [diff] [blame] | 1616 | return RX_DROP_MONITOR; |
Ron Rindjunsky | fd4c7f2 | 2007-11-26 16:14:33 +0200 | [diff] [blame] | 1617 | |
Johannes Berg | 5cf121c | 2008-02-25 16:27:43 +0100 | [diff] [blame] | 1618 | if (!(rx->flags & IEEE80211_RX_AMSDU)) |
Johannes Berg | 9ae54c8 | 2008-01-31 19:48:20 +0100 | [diff] [blame] | 1619 | return RX_CONTINUE; |
Ron Rindjunsky | fd4c7f2 | 2007-11-26 16:14:33 +0200 | [diff] [blame] | 1620 | |
Zhu Yi | eaf85ca | 2009-12-01 10:18:37 +0800 | [diff] [blame] | 1621 | if (ieee80211_has_a4(hdr->frame_control) && |
| 1622 | rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN && |
| 1623 | !rx->sdata->u.vlan.sta) |
| 1624 | return RX_DROP_UNUSABLE; |
| 1625 | |
| 1626 | if (is_multicast_ether_addr(hdr->addr1) && |
| 1627 | ((rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN && |
| 1628 | rx->sdata->u.vlan.sta) || |
| 1629 | (rx->sdata->vif.type == NL80211_IFTYPE_STATION && |
| 1630 | rx->sdata->u.mgd.use_4addr))) |
Johannes Berg | e4c26ad | 2008-01-31 19:48:21 +0100 | [diff] [blame] | 1631 | return RX_DROP_UNUSABLE; |
Ron Rindjunsky | fd4c7f2 | 2007-11-26 16:14:33 +0200 | [diff] [blame] | 1632 | |
| 1633 | skb->dev = dev; |
Zhu Yi | eaf85ca | 2009-12-01 10:18:37 +0800 | [diff] [blame] | 1634 | __skb_queue_head_init(&frame_list); |
Ron Rindjunsky | fd4c7f2 | 2007-11-26 16:14:33 +0200 | [diff] [blame] | 1635 | |
Zhu Yi | e3cf8b3 | 2010-03-29 17:35:07 +0800 | [diff] [blame] | 1636 | if (skb_linearize(skb)) |
| 1637 | return RX_DROP_UNUSABLE; |
| 1638 | |
Zhu Yi | eaf85ca | 2009-12-01 10:18:37 +0800 | [diff] [blame] | 1639 | ieee80211_amsdu_to_8023s(skb, &frame_list, dev->dev_addr, |
| 1640 | rx->sdata->vif.type, |
| 1641 | rx->local->hw.extra_tx_headroom); |
Ron Rindjunsky | fd4c7f2 | 2007-11-26 16:14:33 +0200 | [diff] [blame] | 1642 | |
Zhu Yi | eaf85ca | 2009-12-01 10:18:37 +0800 | [diff] [blame] | 1643 | while (!skb_queue_empty(&frame_list)) { |
| 1644 | rx->skb = __skb_dequeue(&frame_list); |
Ron Rindjunsky | fd4c7f2 | 2007-11-26 16:14:33 +0200 | [diff] [blame] | 1645 | |
Harvey Harrison | 358c8d9 | 2008-07-15 18:44:13 -0700 | [diff] [blame] | 1646 | if (!ieee80211_frame_allowed(rx, fc)) { |
Zhu Yi | eaf85ca | 2009-12-01 10:18:37 +0800 | [diff] [blame] | 1647 | dev_kfree_skb(rx->skb); |
Johannes Berg | ce3edf6d0 | 2007-12-19 01:31:22 +0100 | [diff] [blame] | 1648 | continue; |
| 1649 | } |
Zhu Yi | eaf85ca | 2009-12-01 10:18:37 +0800 | [diff] [blame] | 1650 | dev->stats.rx_packets++; |
| 1651 | dev->stats.rx_bytes += rx->skb->len; |
Ron Rindjunsky | fd4c7f2 | 2007-11-26 16:14:33 +0200 | [diff] [blame] | 1652 | |
| 1653 | ieee80211_deliver_skb(rx); |
| 1654 | } |
| 1655 | |
Johannes Berg | 9ae54c8 | 2008-01-31 19:48:20 +0100 | [diff] [blame] | 1656 | return RX_QUEUED; |
Ron Rindjunsky | fd4c7f2 | 2007-11-26 16:14:33 +0200 | [diff] [blame] | 1657 | } |
| 1658 | |
Ingo Molnar | bf94e17 | 2008-10-12 23:51:38 -0700 | [diff] [blame] | 1659 | #ifdef CONFIG_MAC80211_MESH |
Davide Pesavento | b0dee57 | 2008-09-27 17:29:12 +0200 | [diff] [blame] | 1660 | static ieee80211_rx_result |
Luis Carlos Cobo | e32f85f | 2008-08-05 19:34:52 +0200 | [diff] [blame] | 1661 | ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx) |
| 1662 | { |
| 1663 | struct ieee80211_hdr *hdr; |
| 1664 | struct ieee80211s_hdr *mesh_hdr; |
| 1665 | unsigned int hdrlen; |
| 1666 | struct sk_buff *skb = rx->skb, *fwd_skb; |
Johannes Berg | 3b8d81e | 2009-06-17 17:43:56 +0200 | [diff] [blame] | 1667 | struct ieee80211_local *local = rx->local; |
Johannes Berg | eb9fb5b | 2009-11-16 13:58:20 +0100 | [diff] [blame] | 1668 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
Luis Carlos Cobo | e32f85f | 2008-08-05 19:34:52 +0200 | [diff] [blame] | 1669 | |
| 1670 | hdr = (struct ieee80211_hdr *) skb->data; |
| 1671 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
| 1672 | mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen); |
| 1673 | |
| 1674 | if (!ieee80211_is_data(hdr->frame_control)) |
| 1675 | return RX_CONTINUE; |
| 1676 | |
| 1677 | if (!mesh_hdr->ttl) |
| 1678 | /* illegal frame */ |
| 1679 | return RX_DROP_MONITOR; |
| 1680 | |
Javier Cardona | 43b7b31 | 2009-10-15 18:10:51 -0700 | [diff] [blame] | 1681 | if (mesh_hdr->flags & MESH_FLAGS_AE) { |
YanBo | 79617de | 2008-09-22 13:30:32 +0800 | [diff] [blame] | 1682 | struct mesh_path *mppath; |
Javier Cardona | 43b7b31 | 2009-10-15 18:10:51 -0700 | [diff] [blame] | 1683 | char *proxied_addr; |
| 1684 | char *mpp_addr; |
| 1685 | |
| 1686 | if (is_multicast_ether_addr(hdr->addr1)) { |
| 1687 | mpp_addr = hdr->addr3; |
| 1688 | proxied_addr = mesh_hdr->eaddr1; |
| 1689 | } else { |
| 1690 | mpp_addr = hdr->addr4; |
| 1691 | proxied_addr = mesh_hdr->eaddr2; |
| 1692 | } |
YanBo | 79617de | 2008-09-22 13:30:32 +0800 | [diff] [blame] | 1693 | |
YanBo | 79617de | 2008-09-22 13:30:32 +0800 | [diff] [blame] | 1694 | rcu_read_lock(); |
Javier Cardona | 43b7b31 | 2009-10-15 18:10:51 -0700 | [diff] [blame] | 1695 | mppath = mpp_path_lookup(proxied_addr, sdata); |
YanBo | 79617de | 2008-09-22 13:30:32 +0800 | [diff] [blame] | 1696 | if (!mppath) { |
Javier Cardona | 43b7b31 | 2009-10-15 18:10:51 -0700 | [diff] [blame] | 1697 | mpp_path_add(proxied_addr, mpp_addr, sdata); |
YanBo | 79617de | 2008-09-22 13:30:32 +0800 | [diff] [blame] | 1698 | } else { |
| 1699 | spin_lock_bh(&mppath->state_lock); |
Javier Cardona | 43b7b31 | 2009-10-15 18:10:51 -0700 | [diff] [blame] | 1700 | if (compare_ether_addr(mppath->mpp, mpp_addr) != 0) |
| 1701 | memcpy(mppath->mpp, mpp_addr, ETH_ALEN); |
YanBo | 79617de | 2008-09-22 13:30:32 +0800 | [diff] [blame] | 1702 | spin_unlock_bh(&mppath->state_lock); |
| 1703 | } |
| 1704 | rcu_read_unlock(); |
| 1705 | } |
| 1706 | |
Javier Cardona | 3c5772a | 2009-08-10 12:15:48 -0700 | [diff] [blame] | 1707 | /* Frame has reached destination. Don't forward */ |
| 1708 | if (!is_multicast_ether_addr(hdr->addr1) && |
Johannes Berg | 47846c9 | 2009-11-25 17:46:19 +0100 | [diff] [blame] | 1709 | compare_ether_addr(sdata->vif.addr, hdr->addr3) == 0) |
Luis Carlos Cobo | e32f85f | 2008-08-05 19:34:52 +0200 | [diff] [blame] | 1710 | return RX_CONTINUE; |
| 1711 | |
| 1712 | mesh_hdr->ttl--; |
| 1713 | |
| 1714 | if (rx->flags & IEEE80211_RX_RA_MATCH) { |
| 1715 | if (!mesh_hdr->ttl) |
Johannes Berg | 472dbc4 | 2008-09-11 00:01:49 +0200 | [diff] [blame] | 1716 | IEEE80211_IFSTA_MESH_CTR_INC(&rx->sdata->u.mesh, |
Luis Carlos Cobo | e32f85f | 2008-08-05 19:34:52 +0200 | [diff] [blame] | 1717 | dropped_frames_ttl); |
| 1718 | else { |
| 1719 | struct ieee80211_hdr *fwd_hdr; |
Johannes Berg | 3b8d81e | 2009-06-17 17:43:56 +0200 | [diff] [blame] | 1720 | struct ieee80211_tx_info *info; |
| 1721 | |
Luis Carlos Cobo | e32f85f | 2008-08-05 19:34:52 +0200 | [diff] [blame] | 1722 | fwd_skb = skb_copy(skb, GFP_ATOMIC); |
| 1723 | |
| 1724 | if (!fwd_skb && net_ratelimit()) |
| 1725 | printk(KERN_DEBUG "%s: failed to clone mesh frame\n", |
Johannes Berg | 47846c9 | 2009-11-25 17:46:19 +0100 | [diff] [blame] | 1726 | sdata->name); |
Luis Carlos Cobo | e32f85f | 2008-08-05 19:34:52 +0200 | [diff] [blame] | 1727 | |
| 1728 | fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data; |
Johannes Berg | 47846c9 | 2009-11-25 17:46:19 +0100 | [diff] [blame] | 1729 | memcpy(fwd_hdr->addr2, sdata->vif.addr, ETH_ALEN); |
Johannes Berg | 3b8d81e | 2009-06-17 17:43:56 +0200 | [diff] [blame] | 1730 | info = IEEE80211_SKB_CB(fwd_skb); |
| 1731 | memset(info, 0, sizeof(*info)); |
| 1732 | info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; |
Johannes Berg | 5061b0c | 2009-07-14 00:33:34 +0200 | [diff] [blame] | 1733 | info->control.vif = &rx->sdata->vif; |
Johannes Berg | cf0277e | 2010-01-05 18:00:58 +0100 | [diff] [blame] | 1734 | skb_set_queue_mapping(skb, |
| 1735 | ieee80211_select_queue(rx->sdata, fwd_skb)); |
| 1736 | ieee80211_set_qos_hdr(local, skb); |
Daniel Walker | c8a61a7 | 2009-08-18 10:59:00 -0700 | [diff] [blame] | 1737 | if (is_multicast_ether_addr(fwd_hdr->addr1)) |
| 1738 | IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh, |
| 1739 | fwded_mcast); |
| 1740 | else { |
Javier Cardona | 3c5772a | 2009-08-10 12:15:48 -0700 | [diff] [blame] | 1741 | int err; |
| 1742 | /* |
| 1743 | * Save TA to addr1 to send TA a path error if a |
| 1744 | * suitable next hop is not found |
| 1745 | */ |
| 1746 | memcpy(fwd_hdr->addr1, fwd_hdr->addr2, |
Javier Cardona | 249b405 | 2009-07-07 10:55:03 -0700 | [diff] [blame] | 1747 | ETH_ALEN); |
Javier Cardona | 3c5772a | 2009-08-10 12:15:48 -0700 | [diff] [blame] | 1748 | err = mesh_nexthop_lookup(fwd_skb, sdata); |
Javier Cardona | 249b405 | 2009-07-07 10:55:03 -0700 | [diff] [blame] | 1749 | /* Failed to immediately resolve next hop: |
| 1750 | * fwded frame was dropped or will be added |
| 1751 | * later to the pending skb queue. */ |
| 1752 | if (err) |
| 1753 | return RX_DROP_MONITOR; |
Daniel Walker | c8a61a7 | 2009-08-18 10:59:00 -0700 | [diff] [blame] | 1754 | |
| 1755 | IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh, |
| 1756 | fwded_unicast); |
Javier Cardona | 249b405 | 2009-07-07 10:55:03 -0700 | [diff] [blame] | 1757 | } |
| 1758 | IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh, |
| 1759 | fwded_frames); |
Johannes Berg | 3b8d81e | 2009-06-17 17:43:56 +0200 | [diff] [blame] | 1760 | ieee80211_add_pending_skb(local, fwd_skb); |
Luis Carlos Cobo | e32f85f | 2008-08-05 19:34:52 +0200 | [diff] [blame] | 1761 | } |
| 1762 | } |
| 1763 | |
Javier Cardona | 3c5772a | 2009-08-10 12:15:48 -0700 | [diff] [blame] | 1764 | if (is_multicast_ether_addr(hdr->addr1) || |
Johannes Berg | eb9fb5b | 2009-11-16 13:58:20 +0100 | [diff] [blame] | 1765 | sdata->dev->flags & IFF_PROMISC) |
Luis Carlos Cobo | e32f85f | 2008-08-05 19:34:52 +0200 | [diff] [blame] | 1766 | return RX_CONTINUE; |
| 1767 | else |
| 1768 | return RX_DROP_MONITOR; |
| 1769 | } |
Ingo Molnar | bf94e17 | 2008-10-12 23:51:38 -0700 | [diff] [blame] | 1770 | #endif |
Luis Carlos Cobo | e32f85f | 2008-08-05 19:34:52 +0200 | [diff] [blame] | 1771 | |
| 1772 | static ieee80211_rx_result debug_noinline |
Johannes Berg | 5cf121c | 2008-02-25 16:27:43 +0100 | [diff] [blame] | 1773 | ieee80211_rx_h_data(struct ieee80211_rx_data *rx) |
Ron Rindjunsky | 76ee65b | 2007-11-22 19:49:12 +0200 | [diff] [blame] | 1774 | { |
Johannes Berg | eb9fb5b | 2009-11-16 13:58:20 +0100 | [diff] [blame] | 1775 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
Vivek Natarajan | e15276a | 2010-02-08 17:47:01 +0530 | [diff] [blame] | 1776 | struct ieee80211_local *local = rx->local; |
Johannes Berg | eb9fb5b | 2009-11-16 13:58:20 +0100 | [diff] [blame] | 1777 | struct net_device *dev = sdata->dev; |
Harvey Harrison | 358c8d9 | 2008-07-15 18:44:13 -0700 | [diff] [blame] | 1778 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
| 1779 | __le16 fc = hdr->frame_control; |
Johannes Berg | ce3edf6d0 | 2007-12-19 01:31:22 +0100 | [diff] [blame] | 1780 | int err; |
Ron Rindjunsky | 76ee65b | 2007-11-22 19:49:12 +0200 | [diff] [blame] | 1781 | |
Harvey Harrison | 358c8d9 | 2008-07-15 18:44:13 -0700 | [diff] [blame] | 1782 | if (unlikely(!ieee80211_is_data(hdr->frame_control))) |
Johannes Berg | 9ae54c8 | 2008-01-31 19:48:20 +0100 | [diff] [blame] | 1783 | return RX_CONTINUE; |
Ron Rindjunsky | 76ee65b | 2007-11-22 19:49:12 +0200 | [diff] [blame] | 1784 | |
Harvey Harrison | 358c8d9 | 2008-07-15 18:44:13 -0700 | [diff] [blame] | 1785 | if (unlikely(!ieee80211_is_data_present(hdr->frame_control))) |
Johannes Berg | e4c26ad | 2008-01-31 19:48:21 +0100 | [diff] [blame] | 1786 | return RX_DROP_MONITOR; |
Ron Rindjunsky | 76ee65b | 2007-11-22 19:49:12 +0200 | [diff] [blame] | 1787 | |
Felix Fietkau | f14543e | 2009-11-10 20:10:05 +0100 | [diff] [blame] | 1788 | /* |
| 1789 | * Allow the cooked monitor interface of an AP to see 4-addr frames so |
| 1790 | * that a 4-addr station can be detected and moved into a separate VLAN |
| 1791 | */ |
| 1792 | if (ieee80211_has_a4(hdr->frame_control) && |
| 1793 | sdata->vif.type == NL80211_IFTYPE_AP) |
| 1794 | return RX_DROP_MONITOR; |
| 1795 | |
Zhu Yi | e31a16d | 2009-05-21 21:47:03 +0800 | [diff] [blame] | 1796 | err = __ieee80211_data_to_8023(rx); |
Ron Rindjunsky | 76ee65b | 2007-11-22 19:49:12 +0200 | [diff] [blame] | 1797 | if (unlikely(err)) |
Johannes Berg | e4c26ad | 2008-01-31 19:48:21 +0100 | [diff] [blame] | 1798 | return RX_DROP_UNUSABLE; |
Ron Rindjunsky | 76ee65b | 2007-11-22 19:49:12 +0200 | [diff] [blame] | 1799 | |
Harvey Harrison | 358c8d9 | 2008-07-15 18:44:13 -0700 | [diff] [blame] | 1800 | if (!ieee80211_frame_allowed(rx, fc)) |
Johannes Berg | e4c26ad | 2008-01-31 19:48:21 +0100 | [diff] [blame] | 1801 | return RX_DROP_MONITOR; |
Johannes Berg | ce3edf6d0 | 2007-12-19 01:31:22 +0100 | [diff] [blame] | 1802 | |
Ron Rindjunsky | 76ee65b | 2007-11-22 19:49:12 +0200 | [diff] [blame] | 1803 | rx->skb->dev = dev; |
| 1804 | |
| 1805 | dev->stats.rx_packets++; |
| 1806 | dev->stats.rx_bytes += rx->skb->len; |
| 1807 | |
Vivek Natarajan | e15276a | 2010-02-08 17:47:01 +0530 | [diff] [blame] | 1808 | if (ieee80211_is_data(hdr->frame_control) && |
| 1809 | !is_multicast_ether_addr(hdr->addr1) && |
| 1810 | local->hw.conf.dynamic_ps_timeout > 0 && local->ps_sdata) { |
| 1811 | mod_timer(&local->dynamic_ps_timer, jiffies + |
| 1812 | msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout)); |
| 1813 | } |
| 1814 | |
Ron Rindjunsky | 76ee65b | 2007-11-22 19:49:12 +0200 | [diff] [blame] | 1815 | ieee80211_deliver_skb(rx); |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 1816 | |
Johannes Berg | 9ae54c8 | 2008-01-31 19:48:20 +0100 | [diff] [blame] | 1817 | return RX_QUEUED; |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 1818 | } |
| 1819 | |
Johannes Berg | 4946162 | 2008-06-30 15:10:45 +0200 | [diff] [blame] | 1820 | static ieee80211_rx_result debug_noinline |
Johannes Berg | 2569a82 | 2009-11-25 17:46:17 +0100 | [diff] [blame] | 1821 | ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx, struct sk_buff_head *frames) |
Ron Rindjunsky | 7136471 | 2007-12-25 17:00:36 +0200 | [diff] [blame] | 1822 | { |
| 1823 | struct ieee80211_local *local = rx->local; |
| 1824 | struct ieee80211_hw *hw = &local->hw; |
| 1825 | struct sk_buff *skb = rx->skb; |
Harvey Harrison | a7767f9 | 2008-07-02 16:30:51 -0700 | [diff] [blame] | 1826 | struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data; |
Ron Rindjunsky | 7136471 | 2007-12-25 17:00:36 +0200 | [diff] [blame] | 1827 | struct tid_ampdu_rx *tid_agg_rx; |
| 1828 | u16 start_seq_num; |
| 1829 | u16 tid; |
| 1830 | |
Harvey Harrison | a7767f9 | 2008-07-02 16:30:51 -0700 | [diff] [blame] | 1831 | if (likely(!ieee80211_is_ctl(bar->frame_control))) |
Johannes Berg | 9ae54c8 | 2008-01-31 19:48:20 +0100 | [diff] [blame] | 1832 | return RX_CONTINUE; |
Ron Rindjunsky | 7136471 | 2007-12-25 17:00:36 +0200 | [diff] [blame] | 1833 | |
Harvey Harrison | a7767f9 | 2008-07-02 16:30:51 -0700 | [diff] [blame] | 1834 | if (ieee80211_is_back_req(bar->frame_control)) { |
Johannes Berg | 8ae5977 | 2010-05-30 14:52:58 +0200 | [diff] [blame] | 1835 | struct { |
| 1836 | __le16 control, start_seq_num; |
| 1837 | } __packed bar_data; |
| 1838 | |
Ron Rindjunsky | 7136471 | 2007-12-25 17:00:36 +0200 | [diff] [blame] | 1839 | if (!rx->sta) |
Johannes Berg | a02ae75 | 2009-11-16 12:00:40 +0100 | [diff] [blame] | 1840 | return RX_DROP_MONITOR; |
Johannes Berg | 8ae5977 | 2010-05-30 14:52:58 +0200 | [diff] [blame] | 1841 | |
| 1842 | if (skb_copy_bits(skb, offsetof(struct ieee80211_bar, control), |
| 1843 | &bar_data, sizeof(bar_data))) |
| 1844 | return RX_DROP_MONITOR; |
| 1845 | |
Johannes Berg | 8ae5977 | 2010-05-30 14:52:58 +0200 | [diff] [blame] | 1846 | tid = le16_to_cpu(bar_data.control) >> 12; |
Johannes Berg | a87f736 | 2010-06-10 10:21:38 +0200 | [diff] [blame] | 1847 | |
| 1848 | tid_agg_rx = rcu_dereference(rx->sta->ampdu_mlme.tid_rx[tid]); |
| 1849 | if (!tid_agg_rx) |
Johannes Berg | a02ae75 | 2009-11-16 12:00:40 +0100 | [diff] [blame] | 1850 | return RX_DROP_MONITOR; |
Ron Rindjunsky | 7136471 | 2007-12-25 17:00:36 +0200 | [diff] [blame] | 1851 | |
Johannes Berg | 8ae5977 | 2010-05-30 14:52:58 +0200 | [diff] [blame] | 1852 | start_seq_num = le16_to_cpu(bar_data.start_seq_num) >> 4; |
Ron Rindjunsky | 7136471 | 2007-12-25 17:00:36 +0200 | [diff] [blame] | 1853 | |
| 1854 | /* reset session timer */ |
Johannes Berg | 20ad19d | 2009-02-10 21:25:45 +0100 | [diff] [blame] | 1855 | if (tid_agg_rx->timeout) |
| 1856 | mod_timer(&tid_agg_rx->session_timer, |
| 1857 | TU_TO_EXP_TIME(tid_agg_rx->timeout)); |
Ron Rindjunsky | 7136471 | 2007-12-25 17:00:36 +0200 | [diff] [blame] | 1858 | |
Johannes Berg | a02ae75 | 2009-11-16 12:00:40 +0100 | [diff] [blame] | 1859 | /* release stored frames up to start of BAR */ |
Johannes Berg | 2569a82 | 2009-11-25 17:46:17 +0100 | [diff] [blame] | 1860 | ieee80211_release_reorder_frames(hw, tid_agg_rx, start_seq_num, |
| 1861 | frames); |
Johannes Berg | a02ae75 | 2009-11-16 12:00:40 +0100 | [diff] [blame] | 1862 | kfree_skb(skb); |
| 1863 | return RX_QUEUED; |
Ron Rindjunsky | 7136471 | 2007-12-25 17:00:36 +0200 | [diff] [blame] | 1864 | } |
| 1865 | |
Johannes Berg | 08daeca | 2010-05-30 14:53:43 +0200 | [diff] [blame] | 1866 | /* |
| 1867 | * After this point, we only want management frames, |
| 1868 | * so we can drop all remaining control frames to |
| 1869 | * cooked monitor interfaces. |
| 1870 | */ |
| 1871 | return RX_DROP_MONITOR; |
Ron Rindjunsky | 7136471 | 2007-12-25 17:00:36 +0200 | [diff] [blame] | 1872 | } |
| 1873 | |
Jouni Malinen | f4f727a | 2009-01-10 11:46:53 +0200 | [diff] [blame] | 1874 | static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata, |
| 1875 | struct ieee80211_mgmt *mgmt, |
| 1876 | size_t len) |
Jouni Malinen | fea1473 | 2009-01-08 13:32:06 +0200 | [diff] [blame] | 1877 | { |
| 1878 | struct ieee80211_local *local = sdata->local; |
| 1879 | struct sk_buff *skb; |
| 1880 | struct ieee80211_mgmt *resp; |
| 1881 | |
Johannes Berg | 47846c9 | 2009-11-25 17:46:19 +0100 | [diff] [blame] | 1882 | if (compare_ether_addr(mgmt->da, sdata->vif.addr) != 0) { |
Jouni Malinen | fea1473 | 2009-01-08 13:32:06 +0200 | [diff] [blame] | 1883 | /* Not to own unicast address */ |
| 1884 | return; |
| 1885 | } |
| 1886 | |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 1887 | if (compare_ether_addr(mgmt->sa, sdata->u.mgd.bssid) != 0 || |
| 1888 | compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid) != 0) { |
Johannes Berg | 77fdaa1 | 2009-07-07 03:45:17 +0200 | [diff] [blame] | 1889 | /* Not from the current AP or not associated yet. */ |
Jouni Malinen | fea1473 | 2009-01-08 13:32:06 +0200 | [diff] [blame] | 1890 | return; |
| 1891 | } |
| 1892 | |
| 1893 | if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) { |
| 1894 | /* Too short SA Query request frame */ |
| 1895 | return; |
| 1896 | } |
| 1897 | |
| 1898 | skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom); |
| 1899 | if (skb == NULL) |
| 1900 | return; |
| 1901 | |
| 1902 | skb_reserve(skb, local->hw.extra_tx_headroom); |
| 1903 | resp = (struct ieee80211_mgmt *) skb_put(skb, 24); |
| 1904 | memset(resp, 0, 24); |
| 1905 | memcpy(resp->da, mgmt->sa, ETH_ALEN); |
Johannes Berg | 47846c9 | 2009-11-25 17:46:19 +0100 | [diff] [blame] | 1906 | memcpy(resp->sa, sdata->vif.addr, ETH_ALEN); |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 1907 | memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN); |
Jouni Malinen | fea1473 | 2009-01-08 13:32:06 +0200 | [diff] [blame] | 1908 | resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
| 1909 | IEEE80211_STYPE_ACTION); |
| 1910 | skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query)); |
| 1911 | resp->u.action.category = WLAN_CATEGORY_SA_QUERY; |
| 1912 | resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE; |
| 1913 | memcpy(resp->u.action.u.sa_query.trans_id, |
| 1914 | mgmt->u.action.u.sa_query.trans_id, |
| 1915 | WLAN_SA_QUERY_TR_ID_LEN); |
| 1916 | |
Johannes Berg | 62ae67b | 2009-11-18 18:42:05 +0100 | [diff] [blame] | 1917 | ieee80211_tx_skb(sdata, skb); |
Jouni Malinen | fea1473 | 2009-01-08 13:32:06 +0200 | [diff] [blame] | 1918 | } |
| 1919 | |
Johannes Berg | 4946162 | 2008-06-30 15:10:45 +0200 | [diff] [blame] | 1920 | static ieee80211_rx_result debug_noinline |
Johannes Berg | de1ede7a | 2008-09-09 14:42:50 +0200 | [diff] [blame] | 1921 | ieee80211_rx_h_action(struct ieee80211_rx_data *rx) |
| 1922 | { |
| 1923 | struct ieee80211_local *local = rx->local; |
Johannes Berg | eb9fb5b | 2009-11-16 13:58:20 +0100 | [diff] [blame] | 1924 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
Johannes Berg | de1ede7a | 2008-09-09 14:42:50 +0200 | [diff] [blame] | 1925 | struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; |
Johannes Berg | 8404080 | 2010-02-15 12:46:39 +0200 | [diff] [blame] | 1926 | struct sk_buff *nskb; |
Jouni Malinen | 026331c | 2010-02-15 12:53:10 +0200 | [diff] [blame] | 1927 | struct ieee80211_rx_status *status; |
Johannes Berg | de1ede7a | 2008-09-09 14:42:50 +0200 | [diff] [blame] | 1928 | int len = rx->skb->len; |
| 1929 | |
| 1930 | if (!ieee80211_is_action(mgmt->frame_control)) |
| 1931 | return RX_CONTINUE; |
| 1932 | |
Jouni Malinen | 026331c | 2010-02-15 12:53:10 +0200 | [diff] [blame] | 1933 | /* drop too small frames */ |
| 1934 | if (len < IEEE80211_MIN_ACTION_SIZE) |
| 1935 | return RX_DROP_UNUSABLE; |
| 1936 | |
| 1937 | if (!rx->sta && mgmt->u.action.category != WLAN_CATEGORY_PUBLIC) |
Johannes Berg | 8404080 | 2010-02-15 12:46:39 +0200 | [diff] [blame] | 1938 | return RX_DROP_UNUSABLE; |
Johannes Berg | de1ede7a | 2008-09-09 14:42:50 +0200 | [diff] [blame] | 1939 | |
| 1940 | if (!(rx->flags & IEEE80211_RX_RA_MATCH)) |
Johannes Berg | 8404080 | 2010-02-15 12:46:39 +0200 | [diff] [blame] | 1941 | return RX_DROP_UNUSABLE; |
Johannes Berg | de1ede7a | 2008-09-09 14:42:50 +0200 | [diff] [blame] | 1942 | |
Johannes Berg | bef5d1c | 2010-02-16 11:05:00 +0100 | [diff] [blame] | 1943 | if (ieee80211_drop_unencrypted_mgmt(rx)) |
Johannes Berg | 8404080 | 2010-02-15 12:46:39 +0200 | [diff] [blame] | 1944 | return RX_DROP_UNUSABLE; |
Jouni Malinen | 97ebe12 | 2009-01-08 13:32:08 +0200 | [diff] [blame] | 1945 | |
Johannes Berg | de1ede7a | 2008-09-09 14:42:50 +0200 | [diff] [blame] | 1946 | switch (mgmt->u.action.category) { |
| 1947 | case WLAN_CATEGORY_BACK: |
Johannes Berg | 8abd3f9 | 2009-02-10 21:25:47 +0100 | [diff] [blame] | 1948 | /* |
| 1949 | * The aggregation code is not prepared to handle |
| 1950 | * anything but STA/AP due to the BSSID handling; |
| 1951 | * IBSS could work in the code but isn't supported |
| 1952 | * by drivers or the standard. |
| 1953 | */ |
| 1954 | if (sdata->vif.type != NL80211_IFTYPE_STATION && |
| 1955 | sdata->vif.type != NL80211_IFTYPE_AP_VLAN && |
| 1956 | sdata->vif.type != NL80211_IFTYPE_AP) |
Johannes Berg | 8404080 | 2010-02-15 12:46:39 +0200 | [diff] [blame] | 1957 | break; |
Johannes Berg | 8abd3f9 | 2009-02-10 21:25:47 +0100 | [diff] [blame] | 1958 | |
Jouni Malinen | 026331c | 2010-02-15 12:53:10 +0200 | [diff] [blame] | 1959 | /* verify action_code is present */ |
| 1960 | if (len < IEEE80211_MIN_ACTION_SIZE + 1) |
| 1961 | break; |
| 1962 | |
Johannes Berg | de1ede7a | 2008-09-09 14:42:50 +0200 | [diff] [blame] | 1963 | switch (mgmt->u.action.u.addba_req.action_code) { |
| 1964 | case WLAN_ACTION_ADDBA_REQ: |
| 1965 | if (len < (IEEE80211_MIN_ACTION_SIZE + |
| 1966 | sizeof(mgmt->u.action.u.addba_req))) |
Johannes Berg | bed7ee6 | 2010-06-10 10:21:35 +0200 | [diff] [blame] | 1967 | goto invalid; |
| 1968 | break; |
Johannes Berg | de1ede7a | 2008-09-09 14:42:50 +0200 | [diff] [blame] | 1969 | case WLAN_ACTION_ADDBA_RESP: |
| 1970 | if (len < (IEEE80211_MIN_ACTION_SIZE + |
| 1971 | sizeof(mgmt->u.action.u.addba_resp))) |
Johannes Berg | bed7ee6 | 2010-06-10 10:21:35 +0200 | [diff] [blame] | 1972 | goto invalid; |
| 1973 | break; |
Johannes Berg | de1ede7a | 2008-09-09 14:42:50 +0200 | [diff] [blame] | 1974 | case WLAN_ACTION_DELBA: |
| 1975 | if (len < (IEEE80211_MIN_ACTION_SIZE + |
| 1976 | sizeof(mgmt->u.action.u.delba))) |
Johannes Berg | bed7ee6 | 2010-06-10 10:21:35 +0200 | [diff] [blame] | 1977 | goto invalid; |
| 1978 | break; |
| 1979 | default: |
| 1980 | goto invalid; |
Johannes Berg | de1ede7a | 2008-09-09 14:42:50 +0200 | [diff] [blame] | 1981 | } |
Johannes Berg | bed7ee6 | 2010-06-10 10:21:35 +0200 | [diff] [blame] | 1982 | |
Johannes Berg | 8b58ff8 | 2010-06-10 10:21:51 +0200 | [diff] [blame] | 1983 | goto queue; |
Johannes Berg | 39192c0 | 2008-09-09 14:49:03 +0200 | [diff] [blame] | 1984 | case WLAN_CATEGORY_SPECTRUM_MGMT: |
| 1985 | if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ) |
Johannes Berg | 8404080 | 2010-02-15 12:46:39 +0200 | [diff] [blame] | 1986 | break; |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 1987 | |
| 1988 | if (sdata->vif.type != NL80211_IFTYPE_STATION) |
Johannes Berg | 8404080 | 2010-02-15 12:46:39 +0200 | [diff] [blame] | 1989 | break; |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 1990 | |
Jouni Malinen | 026331c | 2010-02-15 12:53:10 +0200 | [diff] [blame] | 1991 | /* verify action_code is present */ |
| 1992 | if (len < IEEE80211_MIN_ACTION_SIZE + 1) |
| 1993 | break; |
| 1994 | |
Johannes Berg | 39192c0 | 2008-09-09 14:49:03 +0200 | [diff] [blame] | 1995 | switch (mgmt->u.action.u.measurement.action_code) { |
| 1996 | case WLAN_ACTION_SPCT_MSR_REQ: |
| 1997 | if (len < (IEEE80211_MIN_ACTION_SIZE + |
| 1998 | sizeof(mgmt->u.action.u.measurement))) |
Johannes Berg | 8404080 | 2010-02-15 12:46:39 +0200 | [diff] [blame] | 1999 | break; |
Johannes Berg | 39192c0 | 2008-09-09 14:49:03 +0200 | [diff] [blame] | 2000 | ieee80211_process_measurement_req(sdata, mgmt, len); |
Johannes Berg | 8404080 | 2010-02-15 12:46:39 +0200 | [diff] [blame] | 2001 | goto handled; |
Sujith | c481ec9 | 2009-01-06 09:28:37 +0530 | [diff] [blame] | 2002 | case WLAN_ACTION_SPCT_CHL_SWITCH: |
| 2003 | if (len < (IEEE80211_MIN_ACTION_SIZE + |
| 2004 | sizeof(mgmt->u.action.u.chan_switch))) |
Johannes Berg | 8404080 | 2010-02-15 12:46:39 +0200 | [diff] [blame] | 2005 | break; |
Sujith | c481ec9 | 2009-01-06 09:28:37 +0530 | [diff] [blame] | 2006 | |
Johannes Berg | cc32abd | 2009-05-15 11:52:31 +0200 | [diff] [blame] | 2007 | if (sdata->vif.type != NL80211_IFTYPE_STATION) |
Johannes Berg | 8404080 | 2010-02-15 12:46:39 +0200 | [diff] [blame] | 2008 | break; |
Johannes Berg | cc32abd | 2009-05-15 11:52:31 +0200 | [diff] [blame] | 2009 | |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 2010 | if (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN)) |
Johannes Berg | 8404080 | 2010-02-15 12:46:39 +0200 | [diff] [blame] | 2011 | break; |
Sujith | c481ec9 | 2009-01-06 09:28:37 +0530 | [diff] [blame] | 2012 | |
Johannes Berg | 8b58ff8 | 2010-06-10 10:21:51 +0200 | [diff] [blame] | 2013 | goto queue; |
Johannes Berg | 39192c0 | 2008-09-09 14:49:03 +0200 | [diff] [blame] | 2014 | } |
| 2015 | break; |
Jouni Malinen | fea1473 | 2009-01-08 13:32:06 +0200 | [diff] [blame] | 2016 | case WLAN_CATEGORY_SA_QUERY: |
| 2017 | if (len < (IEEE80211_MIN_ACTION_SIZE + |
| 2018 | sizeof(mgmt->u.action.u.sa_query))) |
Johannes Berg | 8404080 | 2010-02-15 12:46:39 +0200 | [diff] [blame] | 2019 | break; |
| 2020 | |
Jouni Malinen | fea1473 | 2009-01-08 13:32:06 +0200 | [diff] [blame] | 2021 | switch (mgmt->u.action.u.sa_query.action) { |
| 2022 | case WLAN_ACTION_SA_QUERY_REQUEST: |
| 2023 | if (sdata->vif.type != NL80211_IFTYPE_STATION) |
Johannes Berg | 8404080 | 2010-02-15 12:46:39 +0200 | [diff] [blame] | 2024 | break; |
Jouni Malinen | fea1473 | 2009-01-08 13:32:06 +0200 | [diff] [blame] | 2025 | ieee80211_process_sa_query_req(sdata, mgmt, len); |
Johannes Berg | 8404080 | 2010-02-15 12:46:39 +0200 | [diff] [blame] | 2026 | goto handled; |
Jouni Malinen | fea1473 | 2009-01-08 13:32:06 +0200 | [diff] [blame] | 2027 | } |
| 2028 | break; |
Javier Cardona | 97ad913 | 2010-03-29 11:00:21 -0700 | [diff] [blame] | 2029 | case WLAN_CATEGORY_MESH_PLINK: |
| 2030 | case WLAN_CATEGORY_MESH_PATH_SEL: |
Johannes Berg | 77a121c | 2010-06-10 10:21:34 +0200 | [diff] [blame] | 2031 | if (!ieee80211_vif_is_mesh(&sdata->vif)) |
| 2032 | break; |
Johannes Berg | 8b58ff8 | 2010-06-10 10:21:51 +0200 | [diff] [blame] | 2033 | goto queue; |
Johannes Berg | 8404080 | 2010-02-15 12:46:39 +0200 | [diff] [blame] | 2034 | } |
Jouni Malinen | 026331c | 2010-02-15 12:53:10 +0200 | [diff] [blame] | 2035 | |
Johannes Berg | bed7ee6 | 2010-06-10 10:21:35 +0200 | [diff] [blame] | 2036 | invalid: |
Johannes Berg | 8404080 | 2010-02-15 12:46:39 +0200 | [diff] [blame] | 2037 | /* |
| 2038 | * For AP mode, hostapd is responsible for handling any action |
| 2039 | * frames that we didn't handle, including returning unknown |
| 2040 | * ones. For all other modes we will return them to the sender, |
| 2041 | * setting the 0x80 bit in the action category, as required by |
| 2042 | * 802.11-2007 7.3.1.11. |
| 2043 | */ |
| 2044 | if (sdata->vif.type == NL80211_IFTYPE_AP || |
| 2045 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN) |
| 2046 | return RX_DROP_MONITOR; |
Felix Fietkau | d790744 | 2010-01-07 20:23:53 +0100 | [diff] [blame] | 2047 | |
Jouni Malinen | 026331c | 2010-02-15 12:53:10 +0200 | [diff] [blame] | 2048 | /* |
| 2049 | * Getting here means the kernel doesn't know how to handle |
| 2050 | * it, but maybe userspace does ... include returned frames |
| 2051 | * so userspace can register for those to know whether ones |
| 2052 | * it transmitted were processed or returned. |
| 2053 | */ |
| 2054 | status = IEEE80211_SKB_RXCB(rx->skb); |
| 2055 | |
Johannes Berg | 9d38d85 | 2010-06-09 17:20:33 +0200 | [diff] [blame] | 2056 | if (cfg80211_rx_action(rx->sdata->dev, status->freq, |
Jouni Malinen | 026331c | 2010-02-15 12:53:10 +0200 | [diff] [blame] | 2057 | rx->skb->data, rx->skb->len, |
| 2058 | GFP_ATOMIC)) |
| 2059 | goto handled; |
| 2060 | |
Johannes Berg | 8404080 | 2010-02-15 12:46:39 +0200 | [diff] [blame] | 2061 | /* do not return rejected action frames */ |
| 2062 | if (mgmt->u.action.category & 0x80) |
| 2063 | return RX_DROP_UNUSABLE; |
| 2064 | |
| 2065 | nskb = skb_copy_expand(rx->skb, local->hw.extra_tx_headroom, 0, |
| 2066 | GFP_ATOMIC); |
| 2067 | if (nskb) { |
John W. Linville | 292b4df | 2010-06-24 11:13:56 -0400 | [diff] [blame] | 2068 | struct ieee80211_mgmt *nmgmt = (void *)nskb->data; |
Johannes Berg | 8404080 | 2010-02-15 12:46:39 +0200 | [diff] [blame] | 2069 | |
John W. Linville | 292b4df | 2010-06-24 11:13:56 -0400 | [diff] [blame] | 2070 | nmgmt->u.action.category |= 0x80; |
| 2071 | memcpy(nmgmt->da, nmgmt->sa, ETH_ALEN); |
| 2072 | memcpy(nmgmt->sa, rx->sdata->vif.addr, ETH_ALEN); |
Johannes Berg | 8404080 | 2010-02-15 12:46:39 +0200 | [diff] [blame] | 2073 | |
| 2074 | memset(nskb->cb, 0, sizeof(nskb->cb)); |
| 2075 | |
| 2076 | ieee80211_tx_skb(rx->sdata, nskb); |
Johannes Berg | de1ede7a | 2008-09-09 14:42:50 +0200 | [diff] [blame] | 2077 | } |
| 2078 | |
Johannes Berg | 8404080 | 2010-02-15 12:46:39 +0200 | [diff] [blame] | 2079 | handled: |
Jouni Malinen | 026331c | 2010-02-15 12:53:10 +0200 | [diff] [blame] | 2080 | if (rx->sta) |
| 2081 | rx->sta->rx_packets++; |
Johannes Berg | 39192c0 | 2008-09-09 14:49:03 +0200 | [diff] [blame] | 2082 | dev_kfree_skb(rx->skb); |
| 2083 | return RX_QUEUED; |
Johannes Berg | 8b58ff8 | 2010-06-10 10:21:51 +0200 | [diff] [blame] | 2084 | |
| 2085 | queue: |
| 2086 | rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME; |
| 2087 | skb_queue_tail(&sdata->skb_queue, rx->skb); |
| 2088 | ieee80211_queue_work(&local->hw, &sdata->work); |
| 2089 | if (rx->sta) |
| 2090 | rx->sta->rx_packets++; |
| 2091 | return RX_QUEUED; |
Johannes Berg | de1ede7a | 2008-09-09 14:42:50 +0200 | [diff] [blame] | 2092 | } |
| 2093 | |
| 2094 | static ieee80211_rx_result debug_noinline |
Johannes Berg | 5cf121c | 2008-02-25 16:27:43 +0100 | [diff] [blame] | 2095 | ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx) |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 2096 | { |
Johannes Berg | eb9fb5b | 2009-11-16 13:58:20 +0100 | [diff] [blame] | 2097 | struct ieee80211_sub_if_data *sdata = rx->sdata; |
Johannes Berg | af6b637 | 2009-12-23 13:15:35 +0100 | [diff] [blame] | 2098 | ieee80211_rx_result rxs; |
Johannes Berg | 77a121c | 2010-06-10 10:21:34 +0200 | [diff] [blame] | 2099 | struct ieee80211_mgmt *mgmt = (void *)rx->skb->data; |
| 2100 | __le16 stype; |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 2101 | |
Johannes Berg | 5cf121c | 2008-02-25 16:27:43 +0100 | [diff] [blame] | 2102 | if (!(rx->flags & IEEE80211_RX_RA_MATCH)) |
Johannes Berg | e4c26ad | 2008-01-31 19:48:21 +0100 | [diff] [blame] | 2103 | return RX_DROP_MONITOR; |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 2104 | |
Johannes Berg | 77a121c | 2010-06-10 10:21:34 +0200 | [diff] [blame] | 2105 | if (rx->skb->len < 24) |
| 2106 | return RX_DROP_MONITOR; |
| 2107 | |
Johannes Berg | bef5d1c | 2010-02-16 11:05:00 +0100 | [diff] [blame] | 2108 | if (ieee80211_drop_unencrypted_mgmt(rx)) |
| 2109 | return RX_DROP_UNUSABLE; |
Jouni Malinen | 97ebe12 | 2009-01-08 13:32:08 +0200 | [diff] [blame] | 2110 | |
Johannes Berg | af6b637 | 2009-12-23 13:15:35 +0100 | [diff] [blame] | 2111 | rxs = ieee80211_work_rx_mgmt(rx->sdata, rx->skb); |
| 2112 | if (rxs != RX_CONTINUE) |
| 2113 | return rxs; |
| 2114 | |
Johannes Berg | 77a121c | 2010-06-10 10:21:34 +0200 | [diff] [blame] | 2115 | stype = mgmt->frame_control & cpu_to_le16(IEEE80211_FCTL_STYPE); |
Johannes Berg | 472dbc4 | 2008-09-11 00:01:49 +0200 | [diff] [blame] | 2116 | |
Johannes Berg | 77a121c | 2010-06-10 10:21:34 +0200 | [diff] [blame] | 2117 | if (!ieee80211_vif_is_mesh(&sdata->vif) && |
| 2118 | sdata->vif.type != NL80211_IFTYPE_ADHOC && |
| 2119 | sdata->vif.type != NL80211_IFTYPE_STATION) |
| 2120 | return RX_DROP_MONITOR; |
Johannes Berg | f9d540e | 2007-09-28 14:02:09 +0200 | [diff] [blame] | 2121 | |
Johannes Berg | 77a121c | 2010-06-10 10:21:34 +0200 | [diff] [blame] | 2122 | switch (stype) { |
| 2123 | case cpu_to_le16(IEEE80211_STYPE_BEACON): |
| 2124 | case cpu_to_le16(IEEE80211_STYPE_PROBE_RESP): |
| 2125 | /* process for all: mesh, mlme, ibss */ |
| 2126 | break; |
| 2127 | case cpu_to_le16(IEEE80211_STYPE_DEAUTH): |
| 2128 | case cpu_to_le16(IEEE80211_STYPE_DISASSOC): |
| 2129 | /* process only for station */ |
| 2130 | if (sdata->vif.type != NL80211_IFTYPE_STATION) |
| 2131 | return RX_DROP_MONITOR; |
| 2132 | break; |
| 2133 | case cpu_to_le16(IEEE80211_STYPE_PROBE_REQ): |
| 2134 | case cpu_to_le16(IEEE80211_STYPE_AUTH): |
| 2135 | /* process only for ibss */ |
| 2136 | if (sdata->vif.type != NL80211_IFTYPE_ADHOC) |
| 2137 | return RX_DROP_MONITOR; |
| 2138 | break; |
| 2139 | default: |
| 2140 | return RX_DROP_MONITOR; |
| 2141 | } |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 2142 | |
Johannes Berg | 77a121c | 2010-06-10 10:21:34 +0200 | [diff] [blame] | 2143 | /* queue up frame and kick off work to process it */ |
Johannes Berg | c1475ca | 2010-06-10 10:21:37 +0200 | [diff] [blame] | 2144 | rx->skb->pkt_type = IEEE80211_SDATA_QUEUE_TYPE_FRAME; |
Johannes Berg | 77a121c | 2010-06-10 10:21:34 +0200 | [diff] [blame] | 2145 | skb_queue_tail(&sdata->skb_queue, rx->skb); |
| 2146 | ieee80211_queue_work(&rx->local->hw, &sdata->work); |
Johannes Berg | 8b58ff8 | 2010-06-10 10:21:51 +0200 | [diff] [blame] | 2147 | if (rx->sta) |
| 2148 | rx->sta->rx_packets++; |
Johannes Berg | 77a121c | 2010-06-10 10:21:34 +0200 | [diff] [blame] | 2149 | |
| 2150 | return RX_QUEUED; |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 2151 | } |
| 2152 | |
Johannes Berg | 3b8d81e | 2009-06-17 17:43:56 +0200 | [diff] [blame] | 2153 | static void ieee80211_rx_michael_mic_report(struct ieee80211_hdr *hdr, |
Johannes Berg | 5cf121c | 2008-02-25 16:27:43 +0100 | [diff] [blame] | 2154 | struct ieee80211_rx_data *rx) |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 2155 | { |
Harvey Harrison | a7767f9 | 2008-07-02 16:30:51 -0700 | [diff] [blame] | 2156 | int keyidx; |
| 2157 | unsigned int hdrlen; |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 2158 | |
Harvey Harrison | a7767f9 | 2008-07-02 16:30:51 -0700 | [diff] [blame] | 2159 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 2160 | if (rx->skb->len >= hdrlen + 4) |
| 2161 | keyidx = rx->skb->data[hdrlen + 3] >> 6; |
| 2162 | else |
| 2163 | keyidx = -1; |
| 2164 | |
Johannes Berg | 8944b79 | 2008-01-31 19:48:26 +0100 | [diff] [blame] | 2165 | if (!rx->sta) { |
Johannes Berg | aa0daf0 | 2007-09-10 14:15:25 +0200 | [diff] [blame] | 2166 | /* |
| 2167 | * Some hardware seem to generate incorrect Michael MIC |
| 2168 | * reports; ignore them to avoid triggering countermeasures. |
| 2169 | */ |
Johannes Berg | af2ced6 | 2009-11-16 12:00:39 +0100 | [diff] [blame] | 2170 | return; |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 2171 | } |
| 2172 | |
Harvey Harrison | a7767f9 | 2008-07-02 16:30:51 -0700 | [diff] [blame] | 2173 | if (!ieee80211_has_protected(hdr->frame_control)) |
Johannes Berg | af2ced6 | 2009-11-16 12:00:39 +0100 | [diff] [blame] | 2174 | return; |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 2175 | |
Johannes Berg | 05c914f | 2008-09-11 00:01:58 +0200 | [diff] [blame] | 2176 | if (rx->sdata->vif.type == NL80211_IFTYPE_AP && keyidx) { |
Johannes Berg | aa0daf0 | 2007-09-10 14:15:25 +0200 | [diff] [blame] | 2177 | /* |
| 2178 | * APs with pairwise keys should never receive Michael MIC |
| 2179 | * errors for non-zero keyidx because these are reserved for |
| 2180 | * group keys and only the AP is sending real multicast |
| 2181 | * frames in the BSS. |
| 2182 | */ |
Johannes Berg | af2ced6 | 2009-11-16 12:00:39 +0100 | [diff] [blame] | 2183 | return; |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 2184 | } |
| 2185 | |
Harvey Harrison | a7767f9 | 2008-07-02 16:30:51 -0700 | [diff] [blame] | 2186 | if (!ieee80211_is_data(hdr->frame_control) && |
| 2187 | !ieee80211_is_auth(hdr->frame_control)) |
Johannes Berg | af2ced6 | 2009-11-16 12:00:39 +0100 | [diff] [blame] | 2188 | return; |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 2189 | |
Johannes Berg | e6d6e34 | 2009-07-01 21:26:47 +0200 | [diff] [blame] | 2190 | mac80211_ev_michael_mic_failure(rx->sdata, keyidx, hdr, NULL, |
| 2191 | GFP_ATOMIC); |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 2192 | } |
| 2193 | |
Johannes Berg | 5cf121c | 2008-02-25 16:27:43 +0100 | [diff] [blame] | 2194 | /* TODO: use IEEE80211_RX_FRAGMENTED */ |
Johannes Berg | 5f0b7de | 2009-11-16 13:58:21 +0100 | [diff] [blame] | 2195 | static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx, |
| 2196 | struct ieee80211_rate *rate) |
Michael Wu | 3d30d94 | 2008-01-31 19:48:27 +0100 | [diff] [blame] | 2197 | { |
| 2198 | struct ieee80211_sub_if_data *sdata; |
| 2199 | struct ieee80211_local *local = rx->local; |
| 2200 | struct ieee80211_rtap_hdr { |
| 2201 | struct ieee80211_radiotap_header hdr; |
| 2202 | u8 flags; |
Johannes Berg | 5f0b7de | 2009-11-16 13:58:21 +0100 | [diff] [blame] | 2203 | u8 rate_or_pad; |
Michael Wu | 3d30d94 | 2008-01-31 19:48:27 +0100 | [diff] [blame] | 2204 | __le16 chan_freq; |
| 2205 | __le16 chan_flags; |
Eric Dumazet | bc10502 | 2010-06-03 03:21:52 -0700 | [diff] [blame] | 2206 | } __packed *rthdr; |
Michael Wu | 3d30d94 | 2008-01-31 19:48:27 +0100 | [diff] [blame] | 2207 | struct sk_buff *skb = rx->skb, *skb2; |
| 2208 | struct net_device *prev_dev = NULL; |
Johannes Berg | eb9fb5b | 2009-11-16 13:58:20 +0100 | [diff] [blame] | 2209 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
Michael Wu | 3d30d94 | 2008-01-31 19:48:27 +0100 | [diff] [blame] | 2210 | |
Johannes Berg | 8c0c709 | 2009-11-25 17:46:15 +0100 | [diff] [blame] | 2211 | if (status->flag & RX_FLAG_INTERNAL_CMTR) |
Michael Wu | 3d30d94 | 2008-01-31 19:48:27 +0100 | [diff] [blame] | 2212 | goto out_free_skb; |
| 2213 | |
| 2214 | if (skb_headroom(skb) < sizeof(*rthdr) && |
| 2215 | pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC)) |
| 2216 | goto out_free_skb; |
| 2217 | |
| 2218 | rthdr = (void *)skb_push(skb, sizeof(*rthdr)); |
| 2219 | memset(rthdr, 0, sizeof(*rthdr)); |
| 2220 | rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr)); |
| 2221 | rthdr->hdr.it_present = |
| 2222 | cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) | |
Michael Wu | 3d30d94 | 2008-01-31 19:48:27 +0100 | [diff] [blame] | 2223 | (1 << IEEE80211_RADIOTAP_CHANNEL)); |
| 2224 | |
Johannes Berg | 5f0b7de | 2009-11-16 13:58:21 +0100 | [diff] [blame] | 2225 | if (rate) { |
| 2226 | rthdr->rate_or_pad = rate->bitrate / 5; |
| 2227 | rthdr->hdr.it_present |= |
| 2228 | cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE); |
| 2229 | } |
Michael Wu | 3d30d94 | 2008-01-31 19:48:27 +0100 | [diff] [blame] | 2230 | rthdr->chan_freq = cpu_to_le16(status->freq); |
| 2231 | |
| 2232 | if (status->band == IEEE80211_BAND_5GHZ) |
| 2233 | rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM | |
| 2234 | IEEE80211_CHAN_5GHZ); |
| 2235 | else |
| 2236 | rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN | |
| 2237 | IEEE80211_CHAN_2GHZ); |
| 2238 | |
| 2239 | skb_set_mac_header(skb, 0); |
| 2240 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
| 2241 | skb->pkt_type = PACKET_OTHERHOST; |
| 2242 | skb->protocol = htons(ETH_P_802_2); |
| 2243 | |
| 2244 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { |
Johannes Berg | 9607e6b | 2009-12-23 13:15:31 +0100 | [diff] [blame] | 2245 | if (!ieee80211_sdata_running(sdata)) |
Michael Wu | 3d30d94 | 2008-01-31 19:48:27 +0100 | [diff] [blame] | 2246 | continue; |
| 2247 | |
Johannes Berg | 05c914f | 2008-09-11 00:01:58 +0200 | [diff] [blame] | 2248 | if (sdata->vif.type != NL80211_IFTYPE_MONITOR || |
Michael Wu | 3d30d94 | 2008-01-31 19:48:27 +0100 | [diff] [blame] | 2249 | !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)) |
| 2250 | continue; |
| 2251 | |
| 2252 | if (prev_dev) { |
| 2253 | skb2 = skb_clone(skb, GFP_ATOMIC); |
| 2254 | if (skb2) { |
| 2255 | skb2->dev = prev_dev; |
John W. Linville | 5548a8a | 2010-06-24 14:25:56 -0400 | [diff] [blame] | 2256 | netif_receive_skb(skb2); |
Michael Wu | 3d30d94 | 2008-01-31 19:48:27 +0100 | [diff] [blame] | 2257 | } |
| 2258 | } |
| 2259 | |
| 2260 | prev_dev = sdata->dev; |
| 2261 | sdata->dev->stats.rx_packets++; |
| 2262 | sdata->dev->stats.rx_bytes += skb->len; |
| 2263 | } |
| 2264 | |
| 2265 | if (prev_dev) { |
| 2266 | skb->dev = prev_dev; |
John W. Linville | 5548a8a | 2010-06-24 14:25:56 -0400 | [diff] [blame] | 2267 | netif_receive_skb(skb); |
Michael Wu | 3d30d94 | 2008-01-31 19:48:27 +0100 | [diff] [blame] | 2268 | skb = NULL; |
| 2269 | } else |
| 2270 | goto out_free_skb; |
| 2271 | |
Johannes Berg | 8c0c709 | 2009-11-25 17:46:15 +0100 | [diff] [blame] | 2272 | status->flag |= RX_FLAG_INTERNAL_CMTR; |
Michael Wu | 3d30d94 | 2008-01-31 19:48:27 +0100 | [diff] [blame] | 2273 | return; |
| 2274 | |
| 2275 | out_free_skb: |
| 2276 | dev_kfree_skb(skb); |
| 2277 | } |
| 2278 | |
Christian Lamparter | aa0c863 | 2010-08-05 01:36:04 +0200 | [diff] [blame^] | 2279 | static void ieee80211_rx_handlers_result(struct ieee80211_rx_data *rx, |
| 2280 | ieee80211_rx_result res) |
| 2281 | { |
| 2282 | switch (res) { |
| 2283 | case RX_DROP_MONITOR: |
| 2284 | I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop); |
| 2285 | if (rx->sta) |
| 2286 | rx->sta->rx_dropped++; |
| 2287 | /* fall through */ |
| 2288 | case RX_CONTINUE: { |
| 2289 | struct ieee80211_rate *rate = NULL; |
| 2290 | struct ieee80211_supported_band *sband; |
| 2291 | struct ieee80211_rx_status *status; |
| 2292 | |
| 2293 | status = IEEE80211_SKB_RXCB((rx->skb)); |
| 2294 | |
| 2295 | sband = rx->local->hw.wiphy->bands[status->band]; |
| 2296 | if (!(status->flag & RX_FLAG_HT)) |
| 2297 | rate = &sband->bitrates[status->rate_idx]; |
| 2298 | |
| 2299 | ieee80211_rx_cooked_monitor(rx, rate); |
| 2300 | break; |
| 2301 | } |
| 2302 | case RX_DROP_UNUSABLE: |
| 2303 | I802_DEBUG_INC(rx->sdata->local->rx_handlers_drop); |
| 2304 | if (rx->sta) |
| 2305 | rx->sta->rx_dropped++; |
| 2306 | dev_kfree_skb(rx->skb); |
| 2307 | break; |
| 2308 | case RX_QUEUED: |
| 2309 | I802_DEBUG_INC(rx->sdata->local->rx_handlers_queued); |
| 2310 | break; |
| 2311 | } |
| 2312 | } |
| 2313 | |
| 2314 | static void ieee80211_rx_handlers(struct ieee80211_rx_data *rx, |
| 2315 | struct sk_buff_head *frames) |
| 2316 | { |
| 2317 | ieee80211_rx_result res = RX_DROP_MONITOR; |
| 2318 | struct sk_buff *skb; |
| 2319 | |
| 2320 | #define CALL_RXH(rxh) \ |
| 2321 | do { \ |
| 2322 | res = rxh(rx); \ |
| 2323 | if (res != RX_CONTINUE) \ |
| 2324 | goto rxh_next; \ |
| 2325 | } while (0); |
| 2326 | |
| 2327 | while ((skb = __skb_dequeue(frames))) { |
| 2328 | /* |
| 2329 | * all the other fields are valid across frames |
| 2330 | * that belong to an aMPDU since they are on the |
| 2331 | * same TID from the same station |
| 2332 | */ |
| 2333 | rx->skb = skb; |
| 2334 | |
| 2335 | CALL_RXH(ieee80211_rx_h_decrypt) |
| 2336 | CALL_RXH(ieee80211_rx_h_check_more_data) |
| 2337 | CALL_RXH(ieee80211_rx_h_sta_process) |
| 2338 | CALL_RXH(ieee80211_rx_h_defragment) |
| 2339 | CALL_RXH(ieee80211_rx_h_ps_poll) |
| 2340 | CALL_RXH(ieee80211_rx_h_michael_mic_verify) |
| 2341 | /* must be after MMIC verify so header is counted in MPDU mic */ |
| 2342 | CALL_RXH(ieee80211_rx_h_remove_qos_control) |
| 2343 | CALL_RXH(ieee80211_rx_h_amsdu) |
| 2344 | #ifdef CONFIG_MAC80211_MESH |
| 2345 | if (ieee80211_vif_is_mesh(&rx->sdata->vif)) |
| 2346 | CALL_RXH(ieee80211_rx_h_mesh_fwding); |
| 2347 | #endif |
| 2348 | CALL_RXH(ieee80211_rx_h_data) |
| 2349 | |
| 2350 | /* special treatment -- needs the queue */ |
| 2351 | res = ieee80211_rx_h_ctrl(rx, frames); |
| 2352 | if (res != RX_CONTINUE) |
| 2353 | goto rxh_next; |
| 2354 | |
| 2355 | CALL_RXH(ieee80211_rx_h_action) |
| 2356 | CALL_RXH(ieee80211_rx_h_mgmt) |
| 2357 | |
| 2358 | rxh_next: |
| 2359 | ieee80211_rx_handlers_result(rx, res); |
| 2360 | |
| 2361 | #undef CALL_RXH |
| 2362 | } |
| 2363 | } |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 2364 | |
Johannes Berg | 8944b79 | 2008-01-31 19:48:26 +0100 | [diff] [blame] | 2365 | static void ieee80211_invoke_rx_handlers(struct ieee80211_sub_if_data *sdata, |
Johannes Berg | 5cf121c | 2008-02-25 16:27:43 +0100 | [diff] [blame] | 2366 | struct ieee80211_rx_data *rx, |
Johannes Berg | 5f0b7de | 2009-11-16 13:58:21 +0100 | [diff] [blame] | 2367 | struct sk_buff *skb, |
| 2368 | struct ieee80211_rate *rate) |
Johannes Berg | 5890529 | 2008-01-31 19:48:25 +0100 | [diff] [blame] | 2369 | { |
Johannes Berg | 2569a82 | 2009-11-25 17:46:17 +0100 | [diff] [blame] | 2370 | struct sk_buff_head reorder_release; |
Johannes Berg | 5890529 | 2008-01-31 19:48:25 +0100 | [diff] [blame] | 2371 | ieee80211_rx_result res = RX_DROP_MONITOR; |
| 2372 | |
Johannes Berg | 2569a82 | 2009-11-25 17:46:17 +0100 | [diff] [blame] | 2373 | __skb_queue_head_init(&reorder_release); |
| 2374 | |
Johannes Berg | 8944b79 | 2008-01-31 19:48:26 +0100 | [diff] [blame] | 2375 | rx->skb = skb; |
| 2376 | rx->sdata = sdata; |
Johannes Berg | 8944b79 | 2008-01-31 19:48:26 +0100 | [diff] [blame] | 2377 | |
Luis Carlos Cobo | e32f85f | 2008-08-05 19:34:52 +0200 | [diff] [blame] | 2378 | #define CALL_RXH(rxh) \ |
| 2379 | do { \ |
| 2380 | res = rxh(rx); \ |
| 2381 | if (res != RX_CONTINUE) \ |
Johannes Berg | 2569a82 | 2009-11-25 17:46:17 +0100 | [diff] [blame] | 2382 | goto rxh_next; \ |
Luis Carlos Cobo | e32f85f | 2008-08-05 19:34:52 +0200 | [diff] [blame] | 2383 | } while (0); |
Johannes Berg | 5890529 | 2008-01-31 19:48:25 +0100 | [diff] [blame] | 2384 | |
Johannes Berg | 4946162 | 2008-06-30 15:10:45 +0200 | [diff] [blame] | 2385 | CALL_RXH(ieee80211_rx_h_passive_scan) |
| 2386 | CALL_RXH(ieee80211_rx_h_check) |
Johannes Berg | 2569a82 | 2009-11-25 17:46:17 +0100 | [diff] [blame] | 2387 | |
| 2388 | ieee80211_rx_reorder_ampdu(rx, &reorder_release); |
| 2389 | |
Christian Lamparter | aa0c863 | 2010-08-05 01:36:04 +0200 | [diff] [blame^] | 2390 | ieee80211_rx_handlers(rx, &reorder_release); |
| 2391 | return; |
Johannes Berg | 4946162 | 2008-06-30 15:10:45 +0200 | [diff] [blame] | 2392 | |
Johannes Berg | 2569a82 | 2009-11-25 17:46:17 +0100 | [diff] [blame] | 2393 | rxh_next: |
Christian Lamparter | aa0c863 | 2010-08-05 01:36:04 +0200 | [diff] [blame^] | 2394 | ieee80211_rx_handlers_result(rx, res); |
| 2395 | |
| 2396 | #undef CALL_RXH |
Johannes Berg | 5890529 | 2008-01-31 19:48:25 +0100 | [diff] [blame] | 2397 | } |
| 2398 | |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 2399 | /* main receive path */ |
| 2400 | |
Johannes Berg | 23a24de | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 2401 | static int prepare_for_handlers(struct ieee80211_sub_if_data *sdata, |
Johannes Berg | 7ab17c4 | 2009-02-10 21:25:43 +0100 | [diff] [blame] | 2402 | struct ieee80211_rx_data *rx, |
Johannes Berg | 23a24de | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 2403 | struct ieee80211_hdr *hdr) |
| 2404 | { |
Johannes Berg | eb9fb5b | 2009-11-16 13:58:20 +0100 | [diff] [blame] | 2405 | struct sk_buff *skb = rx->skb; |
| 2406 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
| 2407 | u8 *bssid = ieee80211_get_bssid(hdr, skb->len, sdata->vif.type); |
Johannes Berg | 23a24de | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 2408 | int multicast = is_multicast_ether_addr(hdr->addr1); |
| 2409 | |
Johannes Berg | 51fb61e | 2007-12-19 01:31:27 +0100 | [diff] [blame] | 2410 | switch (sdata->vif.type) { |
Johannes Berg | 05c914f | 2008-09-11 00:01:58 +0200 | [diff] [blame] | 2411 | case NL80211_IFTYPE_STATION: |
Johannes Berg | 9bc383d | 2009-11-19 11:55:19 +0100 | [diff] [blame] | 2412 | if (!bssid && !sdata->u.mgd.use_4addr) |
Johannes Berg | 23a24de | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 2413 | return 0; |
Johannes Berg | 77fdaa1 | 2009-07-07 03:45:17 +0200 | [diff] [blame] | 2414 | if (!multicast && |
Johannes Berg | 47846c9 | 2009-11-25 17:46:19 +0100 | [diff] [blame] | 2415 | compare_ether_addr(sdata->vif.addr, hdr->addr1) != 0) { |
Johannes Berg | 4150c57 | 2007-09-17 01:29:23 -0400 | [diff] [blame] | 2416 | if (!(sdata->dev->flags & IFF_PROMISC)) |
Johannes Berg | 23a24de | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 2417 | return 0; |
Johannes Berg | 5cf121c | 2008-02-25 16:27:43 +0100 | [diff] [blame] | 2418 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
Johannes Berg | 23a24de | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 2419 | } |
| 2420 | break; |
Johannes Berg | 05c914f | 2008-09-11 00:01:58 +0200 | [diff] [blame] | 2421 | case NL80211_IFTYPE_ADHOC: |
Johannes Berg | 23a24de | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 2422 | if (!bssid) |
| 2423 | return 0; |
Harvey Harrison | a7767f9 | 2008-07-02 16:30:51 -0700 | [diff] [blame] | 2424 | if (ieee80211_is_beacon(hdr->frame_control)) { |
Bruno Randolf | 9d9bf77 | 2008-02-18 11:21:36 +0900 | [diff] [blame] | 2425 | return 1; |
Vladimir Koutny | 87291c0 | 2008-06-13 16:50:44 +0200 | [diff] [blame] | 2426 | } |
Johannes Berg | 4690029 | 2009-02-15 12:44:28 +0100 | [diff] [blame] | 2427 | else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) { |
Johannes Berg | 5cf121c | 2008-02-25 16:27:43 +0100 | [diff] [blame] | 2428 | if (!(rx->flags & IEEE80211_RX_IN_SCAN)) |
Johannes Berg | 23a24de | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 2429 | return 0; |
Johannes Berg | 5cf121c | 2008-02-25 16:27:43 +0100 | [diff] [blame] | 2430 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
Johannes Berg | 23a24de | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 2431 | } else if (!multicast && |
Johannes Berg | 47846c9 | 2009-11-25 17:46:19 +0100 | [diff] [blame] | 2432 | compare_ether_addr(sdata->vif.addr, |
Johannes Berg | 23a24de | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 2433 | hdr->addr1) != 0) { |
Johannes Berg | 4150c57 | 2007-09-17 01:29:23 -0400 | [diff] [blame] | 2434 | if (!(sdata->dev->flags & IFF_PROMISC)) |
Johannes Berg | 23a24de | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 2435 | return 0; |
Johannes Berg | 5cf121c | 2008-02-25 16:27:43 +0100 | [diff] [blame] | 2436 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
Jouni Malinen | 0fb8ca4 | 2008-12-12 14:38:33 +0200 | [diff] [blame] | 2437 | } else if (!rx->sta) { |
| 2438 | int rate_idx; |
Johannes Berg | eb9fb5b | 2009-11-16 13:58:20 +0100 | [diff] [blame] | 2439 | if (status->flag & RX_FLAG_HT) |
Jouni Malinen | 0fb8ca4 | 2008-12-12 14:38:33 +0200 | [diff] [blame] | 2440 | rate_idx = 0; /* TODO: HT rates */ |
| 2441 | else |
Johannes Berg | eb9fb5b | 2009-11-16 13:58:20 +0100 | [diff] [blame] | 2442 | rate_idx = status->rate_idx; |
Johannes Berg | 34e8950 | 2010-02-03 13:59:58 +0100 | [diff] [blame] | 2443 | rx->sta = ieee80211_ibss_add_sta(sdata, bssid, |
| 2444 | hdr->addr2, BIT(rate_idx), GFP_ATOMIC); |
Jouni Malinen | 0fb8ca4 | 2008-12-12 14:38:33 +0200 | [diff] [blame] | 2445 | } |
Johannes Berg | 23a24de | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 2446 | break; |
Johannes Berg | 05c914f | 2008-09-11 00:01:58 +0200 | [diff] [blame] | 2447 | case NL80211_IFTYPE_MESH_POINT: |
Johannes Berg | 6032f93 | 2008-02-23 15:17:07 +0100 | [diff] [blame] | 2448 | if (!multicast && |
Johannes Berg | 47846c9 | 2009-11-25 17:46:19 +0100 | [diff] [blame] | 2449 | compare_ether_addr(sdata->vif.addr, |
Johannes Berg | 6032f93 | 2008-02-23 15:17:07 +0100 | [diff] [blame] | 2450 | hdr->addr1) != 0) { |
| 2451 | if (!(sdata->dev->flags & IFF_PROMISC)) |
| 2452 | return 0; |
| 2453 | |
Johannes Berg | 5cf121c | 2008-02-25 16:27:43 +0100 | [diff] [blame] | 2454 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
Johannes Berg | 6032f93 | 2008-02-23 15:17:07 +0100 | [diff] [blame] | 2455 | } |
| 2456 | break; |
Johannes Berg | 05c914f | 2008-09-11 00:01:58 +0200 | [diff] [blame] | 2457 | case NL80211_IFTYPE_AP_VLAN: |
| 2458 | case NL80211_IFTYPE_AP: |
Johannes Berg | 23a24de | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 2459 | if (!bssid) { |
Johannes Berg | 47846c9 | 2009-11-25 17:46:19 +0100 | [diff] [blame] | 2460 | if (compare_ether_addr(sdata->vif.addr, |
Johannes Berg | 23a24de | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 2461 | hdr->addr1)) |
| 2462 | return 0; |
| 2463 | } else if (!ieee80211_bssid_match(bssid, |
Johannes Berg | 47846c9 | 2009-11-25 17:46:19 +0100 | [diff] [blame] | 2464 | sdata->vif.addr)) { |
Johannes Berg | 5cf121c | 2008-02-25 16:27:43 +0100 | [diff] [blame] | 2465 | if (!(rx->flags & IEEE80211_RX_IN_SCAN)) |
Johannes Berg | 23a24de | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 2466 | return 0; |
Johannes Berg | 5cf121c | 2008-02-25 16:27:43 +0100 | [diff] [blame] | 2467 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
Johannes Berg | 23a24de | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 2468 | } |
Johannes Berg | 23a24de | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 2469 | break; |
Johannes Berg | 05c914f | 2008-09-11 00:01:58 +0200 | [diff] [blame] | 2470 | case NL80211_IFTYPE_WDS: |
Harvey Harrison | a7767f9 | 2008-07-02 16:30:51 -0700 | [diff] [blame] | 2471 | if (bssid || !ieee80211_is_data(hdr->frame_control)) |
Johannes Berg | 23a24de | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 2472 | return 0; |
| 2473 | if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2)) |
| 2474 | return 0; |
| 2475 | break; |
Johannes Berg | 05c914f | 2008-09-11 00:01:58 +0200 | [diff] [blame] | 2476 | case NL80211_IFTYPE_MONITOR: |
Johannes Berg | 05c914f | 2008-09-11 00:01:58 +0200 | [diff] [blame] | 2477 | case NL80211_IFTYPE_UNSPECIFIED: |
| 2478 | case __NL80211_IFTYPE_AFTER_LAST: |
Johannes Berg | fb1c1cd | 2007-09-26 15:19:43 +0200 | [diff] [blame] | 2479 | /* should never get here */ |
| 2480 | WARN_ON(1); |
| 2481 | break; |
Johannes Berg | 23a24de | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 2482 | } |
| 2483 | |
| 2484 | return 1; |
| 2485 | } |
| 2486 | |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 2487 | /* |
Ron Rindjunsky | 6368e4b | 2007-12-24 13:36:39 +0200 | [diff] [blame] | 2488 | * This is the actual Rx frames handler. as it blongs to Rx path it must |
| 2489 | * be called with rcu_read_lock protection. |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 2490 | */ |
Ron Rindjunsky | 71ebb4a | 2008-01-21 12:39:12 +0200 | [diff] [blame] | 2491 | static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw, |
| 2492 | struct sk_buff *skb, |
Johannes Berg | 8318d78 | 2008-01-24 19:38:38 +0100 | [diff] [blame] | 2493 | struct ieee80211_rate *rate) |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 2494 | { |
Johannes Berg | f1d58c2 | 2009-06-17 13:13:00 +0200 | [diff] [blame] | 2495 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 2496 | struct ieee80211_local *local = hw_to_local(hw); |
| 2497 | struct ieee80211_sub_if_data *sdata; |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 2498 | struct ieee80211_hdr *hdr; |
Zhu Yi | e3cf8b3 | 2010-03-29 17:35:07 +0800 | [diff] [blame] | 2499 | __le16 fc; |
Johannes Berg | 5cf121c | 2008-02-25 16:27:43 +0100 | [diff] [blame] | 2500 | struct ieee80211_rx_data rx; |
Ron Rindjunsky | 6368e4b | 2007-12-24 13:36:39 +0200 | [diff] [blame] | 2501 | int prepares; |
Johannes Berg | 8e6f003 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 2502 | struct ieee80211_sub_if_data *prev = NULL; |
| 2503 | struct sk_buff *skb_new; |
Johannes Berg | abe6063 | 2009-11-25 17:46:18 +0100 | [diff] [blame] | 2504 | struct sta_info *sta, *tmp; |
| 2505 | bool found_sta = false; |
Zhu Yi | e3cf8b3 | 2010-03-29 17:35:07 +0800 | [diff] [blame] | 2506 | int err = 0; |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 2507 | |
Zhu Yi | e3cf8b3 | 2010-03-29 17:35:07 +0800 | [diff] [blame] | 2508 | fc = ((struct ieee80211_hdr *)skb->data)->frame_control; |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 2509 | memset(&rx, 0, sizeof(rx)); |
| 2510 | rx.skb = skb; |
| 2511 | rx.local = local; |
Johannes Berg | 72abd81 | 2007-09-17 01:29:22 -0400 | [diff] [blame] | 2512 | |
Zhu Yi | e3cf8b3 | 2010-03-29 17:35:07 +0800 | [diff] [blame] | 2513 | if (ieee80211_is_data(fc) || ieee80211_is_mgmt(fc)) |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 2514 | local->dot11ReceivedFragmentCount++; |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 2515 | |
Helmut Schaa | 142b9f5 | 2009-07-23 13:18:01 +0200 | [diff] [blame] | 2516 | if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning) || |
| 2517 | test_bit(SCAN_OFF_CHANNEL, &local->scanning))) |
Johannes Berg | 5cf121c | 2008-02-25 16:27:43 +0100 | [diff] [blame] | 2518 | rx.flags |= IEEE80211_RX_IN_SCAN; |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 2519 | |
Zhu Yi | e3cf8b3 | 2010-03-29 17:35:07 +0800 | [diff] [blame] | 2520 | if (ieee80211_is_mgmt(fc)) |
| 2521 | err = skb_linearize(skb); |
| 2522 | else |
| 2523 | err = !pskb_may_pull(skb, ieee80211_hdrlen(fc)); |
| 2524 | |
| 2525 | if (err) { |
| 2526 | dev_kfree_skb(skb); |
| 2527 | return; |
| 2528 | } |
| 2529 | |
| 2530 | hdr = (struct ieee80211_hdr *)skb->data; |
Johannes Berg | 38f3714 | 2008-01-29 17:07:43 +0100 | [diff] [blame] | 2531 | ieee80211_parse_qos(&rx); |
Johannes Berg | d1c3a37 | 2009-01-07 00:26:10 +0100 | [diff] [blame] | 2532 | ieee80211_verify_alignment(&rx); |
Johannes Berg | 38f3714 | 2008-01-29 17:07:43 +0100 | [diff] [blame] | 2533 | |
Zhu Yi | e3cf8b3 | 2010-03-29 17:35:07 +0800 | [diff] [blame] | 2534 | if (ieee80211_is_data(fc)) { |
Johannes Berg | abe6063 | 2009-11-25 17:46:18 +0100 | [diff] [blame] | 2535 | for_each_sta_info(local, hdr->addr2, sta, tmp) { |
| 2536 | rx.sta = sta; |
| 2537 | found_sta = true; |
| 2538 | rx.sdata = sta->sdata; |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 2539 | |
Johannes Berg | abe6063 | 2009-11-25 17:46:18 +0100 | [diff] [blame] | 2540 | rx.flags |= IEEE80211_RX_RA_MATCH; |
| 2541 | prepares = prepare_for_handlers(rx.sdata, &rx, hdr); |
| 2542 | if (prepares) { |
| 2543 | if (status->flag & RX_FLAG_MMIC_ERROR) { |
| 2544 | if (rx.flags & IEEE80211_RX_RA_MATCH) |
| 2545 | ieee80211_rx_michael_mic_report(hdr, &rx); |
| 2546 | } else |
| 2547 | prev = rx.sdata; |
| 2548 | } |
| 2549 | } |
| 2550 | } |
| 2551 | if (!found_sta) { |
| 2552 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { |
Johannes Berg | 9607e6b | 2009-12-23 13:15:31 +0100 | [diff] [blame] | 2553 | if (!ieee80211_sdata_running(sdata)) |
Johannes Berg | abe6063 | 2009-11-25 17:46:18 +0100 | [diff] [blame] | 2554 | continue; |
| 2555 | |
| 2556 | if (sdata->vif.type == NL80211_IFTYPE_MONITOR || |
| 2557 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN) |
| 2558 | continue; |
| 2559 | |
Johannes Berg | abe6063 | 2009-11-25 17:46:18 +0100 | [diff] [blame] | 2560 | /* |
| 2561 | * frame is destined for this interface, but if it's |
| 2562 | * not also for the previous one we handle that after |
| 2563 | * the loop to avoid copying the SKB once too much |
| 2564 | */ |
Johannes Berg | b2e7771 | 2007-09-26 15:19:39 +0200 | [diff] [blame] | 2565 | |
Johannes Berg | abe6063 | 2009-11-25 17:46:18 +0100 | [diff] [blame] | 2566 | if (!prev) { |
| 2567 | prev = sdata; |
| 2568 | continue; |
| 2569 | } |
Johannes Berg | 23a24de | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 2570 | |
Felix Fietkau | 4754ffd | 2010-01-31 21:50:12 +0100 | [diff] [blame] | 2571 | rx.sta = sta_info_get_bss(prev, hdr->addr2); |
Felix Fietkau | 4bb29f8 | 2010-01-22 00:36:39 +0100 | [diff] [blame] | 2572 | |
| 2573 | rx.flags |= IEEE80211_RX_RA_MATCH; |
| 2574 | prepares = prepare_for_handlers(prev, &rx, hdr); |
| 2575 | |
| 2576 | if (!prepares) |
| 2577 | goto next; |
| 2578 | |
| 2579 | if (status->flag & RX_FLAG_MMIC_ERROR) { |
| 2580 | rx.sdata = prev; |
| 2581 | if (rx.flags & IEEE80211_RX_RA_MATCH) |
| 2582 | ieee80211_rx_michael_mic_report(hdr, |
| 2583 | &rx); |
| 2584 | goto next; |
| 2585 | } |
| 2586 | |
Johannes Berg | abe6063 | 2009-11-25 17:46:18 +0100 | [diff] [blame] | 2587 | /* |
| 2588 | * frame was destined for the previous interface |
| 2589 | * so invoke RX handlers for it |
| 2590 | */ |
Johannes Berg | 8e6f003 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 2591 | |
Johannes Berg | abe6063 | 2009-11-25 17:46:18 +0100 | [diff] [blame] | 2592 | skb_new = skb_copy(skb, GFP_ATOMIC); |
| 2593 | if (!skb_new) { |
| 2594 | if (net_ratelimit()) |
| 2595 | printk(KERN_DEBUG "%s: failed to copy " |
| 2596 | "multicast frame for %s\n", |
| 2597 | wiphy_name(local->hw.wiphy), |
Johannes Berg | 47846c9 | 2009-11-25 17:46:19 +0100 | [diff] [blame] | 2598 | prev->name); |
Felix Fietkau | 4bb29f8 | 2010-01-22 00:36:39 +0100 | [diff] [blame] | 2599 | goto next; |
Johannes Berg | abe6063 | 2009-11-25 17:46:18 +0100 | [diff] [blame] | 2600 | } |
| 2601 | ieee80211_invoke_rx_handlers(prev, &rx, skb_new, rate); |
Felix Fietkau | 4bb29f8 | 2010-01-22 00:36:39 +0100 | [diff] [blame] | 2602 | next: |
Johannes Berg | 340e11f | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 2603 | prev = sdata; |
Johannes Berg | 8e6f003 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 2604 | } |
Felix Fietkau | 4bb29f8 | 2010-01-22 00:36:39 +0100 | [diff] [blame] | 2605 | |
| 2606 | if (prev) { |
Felix Fietkau | 4754ffd | 2010-01-31 21:50:12 +0100 | [diff] [blame] | 2607 | rx.sta = sta_info_get_bss(prev, hdr->addr2); |
Felix Fietkau | 4bb29f8 | 2010-01-22 00:36:39 +0100 | [diff] [blame] | 2608 | |
| 2609 | rx.flags |= IEEE80211_RX_RA_MATCH; |
| 2610 | prepares = prepare_for_handlers(prev, &rx, hdr); |
| 2611 | |
| 2612 | if (!prepares) |
| 2613 | prev = NULL; |
| 2614 | } |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 2615 | } |
Harvey Harrison | a4b7d7b | 2008-07-15 18:44:14 -0700 | [diff] [blame] | 2616 | if (prev) |
Johannes Berg | 5f0b7de | 2009-11-16 13:58:21 +0100 | [diff] [blame] | 2617 | ieee80211_invoke_rx_handlers(prev, &rx, skb, rate); |
Harvey Harrison | a4b7d7b | 2008-07-15 18:44:14 -0700 | [diff] [blame] | 2618 | else |
Johannes Berg | 8e6f003 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 2619 | dev_kfree_skb(skb); |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 2620 | } |
Ron Rindjunsky | 6368e4b | 2007-12-24 13:36:39 +0200 | [diff] [blame] | 2621 | |
| 2622 | /* |
| 2623 | * This is the receive path handler. It is called by a low level driver when an |
| 2624 | * 802.11 MPDU is received from the hardware. |
| 2625 | */ |
John W. Linville | 103bf9f | 2009-08-20 16:34:15 -0400 | [diff] [blame] | 2626 | void ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb) |
Ron Rindjunsky | 6368e4b | 2007-12-24 13:36:39 +0200 | [diff] [blame] | 2627 | { |
| 2628 | struct ieee80211_local *local = hw_to_local(hw); |
Johannes Berg | 8318d78 | 2008-01-24 19:38:38 +0100 | [diff] [blame] | 2629 | struct ieee80211_rate *rate = NULL; |
| 2630 | struct ieee80211_supported_band *sband; |
Johannes Berg | f1d58c2 | 2009-06-17 13:13:00 +0200 | [diff] [blame] | 2631 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
Johannes Berg | 8318d78 | 2008-01-24 19:38:38 +0100 | [diff] [blame] | 2632 | |
Johannes Berg | d20ef63 | 2009-10-11 15:10:40 +0200 | [diff] [blame] | 2633 | WARN_ON_ONCE(softirq_count() == 0); |
| 2634 | |
Johannes Berg | 77a980d | 2009-08-24 11:46:30 +0200 | [diff] [blame] | 2635 | if (WARN_ON(status->band < 0 || |
| 2636 | status->band >= IEEE80211_NUM_BANDS)) |
| 2637 | goto drop; |
Johannes Berg | 8318d78 | 2008-01-24 19:38:38 +0100 | [diff] [blame] | 2638 | |
| 2639 | sband = local->hw.wiphy->bands[status->band]; |
Johannes Berg | 77a980d | 2009-08-24 11:46:30 +0200 | [diff] [blame] | 2640 | if (WARN_ON(!sband)) |
| 2641 | goto drop; |
Johannes Berg | 8318d78 | 2008-01-24 19:38:38 +0100 | [diff] [blame] | 2642 | |
Johannes Berg | 89c3a8a | 2009-07-28 18:10:17 +0200 | [diff] [blame] | 2643 | /* |
| 2644 | * If we're suspending, it is possible although not too likely |
| 2645 | * that we'd be receiving frames after having already partially |
| 2646 | * quiesced the stack. We can't process such frames then since |
| 2647 | * that might, for example, cause stations to be added or other |
| 2648 | * driver callbacks be invoked. |
| 2649 | */ |
Johannes Berg | 77a980d | 2009-08-24 11:46:30 +0200 | [diff] [blame] | 2650 | if (unlikely(local->quiescing || local->suspended)) |
| 2651 | goto drop; |
Johannes Berg | 89c3a8a | 2009-07-28 18:10:17 +0200 | [diff] [blame] | 2652 | |
Johannes Berg | ea77f12 | 2009-08-21 14:44:45 +0200 | [diff] [blame] | 2653 | /* |
| 2654 | * The same happens when we're not even started, |
| 2655 | * but that's worth a warning. |
| 2656 | */ |
Johannes Berg | 77a980d | 2009-08-24 11:46:30 +0200 | [diff] [blame] | 2657 | if (WARN_ON(!local->started)) |
| 2658 | goto drop; |
Johannes Berg | ea77f12 | 2009-08-21 14:44:45 +0200 | [diff] [blame] | 2659 | |
Johannes Berg | fc88518 | 2010-07-30 13:23:12 +0200 | [diff] [blame] | 2660 | if (likely(!(status->flag & RX_FLAG_FAILED_PLCP_CRC))) { |
Luis R. Rodriguez | e5d6eb8 | 2009-11-09 16:03:22 -0500 | [diff] [blame] | 2661 | /* |
Johannes Berg | fc88518 | 2010-07-30 13:23:12 +0200 | [diff] [blame] | 2662 | * Validate the rate, unless a PLCP error means that |
| 2663 | * we probably can't have a valid rate here anyway. |
Luis R. Rodriguez | e5d6eb8 | 2009-11-09 16:03:22 -0500 | [diff] [blame] | 2664 | */ |
Johannes Berg | fc88518 | 2010-07-30 13:23:12 +0200 | [diff] [blame] | 2665 | |
| 2666 | if (status->flag & RX_FLAG_HT) { |
| 2667 | /* |
| 2668 | * rate_idx is MCS index, which can be [0-76] |
| 2669 | * as documented on: |
| 2670 | * |
| 2671 | * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n |
| 2672 | * |
| 2673 | * Anything else would be some sort of driver or |
| 2674 | * hardware error. The driver should catch hardware |
| 2675 | * errors. |
| 2676 | */ |
| 2677 | if (WARN((status->rate_idx < 0 || |
| 2678 | status->rate_idx > 76), |
| 2679 | "Rate marked as an HT rate but passed " |
| 2680 | "status->rate_idx is not " |
| 2681 | "an MCS index [0-76]: %d (0x%02x)\n", |
| 2682 | status->rate_idx, |
| 2683 | status->rate_idx)) |
| 2684 | goto drop; |
| 2685 | } else { |
| 2686 | if (WARN_ON(status->rate_idx < 0 || |
| 2687 | status->rate_idx >= sband->n_bitrates)) |
| 2688 | goto drop; |
| 2689 | rate = &sband->bitrates[status->rate_idx]; |
| 2690 | } |
Jouni Malinen | 0fb8ca4 | 2008-12-12 14:38:33 +0200 | [diff] [blame] | 2691 | } |
Ron Rindjunsky | 6368e4b | 2007-12-24 13:36:39 +0200 | [diff] [blame] | 2692 | |
| 2693 | /* |
| 2694 | * key references and virtual interfaces are protected using RCU |
| 2695 | * and this requires that we are in a read-side RCU section during |
| 2696 | * receive processing |
| 2697 | */ |
| 2698 | rcu_read_lock(); |
| 2699 | |
| 2700 | /* |
| 2701 | * Frames with failed FCS/PLCP checksum are not returned, |
| 2702 | * all other frames are returned without radiotap header |
| 2703 | * if it was previously present. |
| 2704 | * Also, frames with less than 16 bytes are dropped. |
| 2705 | */ |
Johannes Berg | f1d58c2 | 2009-06-17 13:13:00 +0200 | [diff] [blame] | 2706 | skb = ieee80211_rx_monitor(local, skb, rate); |
Ron Rindjunsky | 6368e4b | 2007-12-24 13:36:39 +0200 | [diff] [blame] | 2707 | if (!skb) { |
| 2708 | rcu_read_unlock(); |
| 2709 | return; |
| 2710 | } |
| 2711 | |
Johannes Berg | 2569a82 | 2009-11-25 17:46:17 +0100 | [diff] [blame] | 2712 | __ieee80211_rx_handle_packet(hw, skb, rate); |
Ron Rindjunsky | 6368e4b | 2007-12-24 13:36:39 +0200 | [diff] [blame] | 2713 | |
| 2714 | rcu_read_unlock(); |
Johannes Berg | 77a980d | 2009-08-24 11:46:30 +0200 | [diff] [blame] | 2715 | |
| 2716 | return; |
| 2717 | drop: |
| 2718 | kfree_skb(skb); |
Ron Rindjunsky | 6368e4b | 2007-12-24 13:36:39 +0200 | [diff] [blame] | 2719 | } |
John W. Linville | 103bf9f | 2009-08-20 16:34:15 -0400 | [diff] [blame] | 2720 | EXPORT_SYMBOL(ieee80211_rx); |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 2721 | |
| 2722 | /* This is a version of the rx handler that can be called from hard irq |
| 2723 | * context. Post the skb on the queue and schedule the tasklet */ |
Johannes Berg | f1d58c2 | 2009-06-17 13:13:00 +0200 | [diff] [blame] | 2724 | void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb) |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 2725 | { |
| 2726 | struct ieee80211_local *local = hw_to_local(hw); |
| 2727 | |
| 2728 | BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb)); |
| 2729 | |
Johannes Berg | 571ecf6 | 2007-07-27 15:43:22 +0200 | [diff] [blame] | 2730 | skb->pkt_type = IEEE80211_RX_MSG; |
| 2731 | skb_queue_tail(&local->skb_queue, skb); |
| 2732 | tasklet_schedule(&local->tasklet); |
| 2733 | } |
| 2734 | EXPORT_SYMBOL(ieee80211_rx_irqsafe); |