1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2007-2009 Sam Leffler, Errno Consulting 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 */ 27 #ifndef _NET80211_IEEE80211_INPUT_H_ 28 #define _NET80211_IEEE80211_INPUT_H_ 29 30 /* Verify the existence and length of __elem or get out. */ 31 #define IEEE80211_VERIFY_ELEMENT(__elem, __maxlen, _action) do { \ 32 if ((__elem) == NULL) { \ 33 IEEE80211_DISCARD(vap, IEEE80211_MSG_ELEMID, \ 34 wh, NULL, "%s", "no " #__elem ); \ 35 vap->iv_stats.is_rx_elem_missing++; \ 36 _action; \ 37 } else if ((__elem)[1] > (__maxlen)) { \ 38 IEEE80211_DISCARD(vap, IEEE80211_MSG_ELEMID, \ 39 wh, NULL, "bad " #__elem " len %d", (__elem)[1]); \ 40 vap->iv_stats.is_rx_elem_toobig++; \ 41 _action; \ 42 } \ 43 } while (0) 44 45 #define IEEE80211_VERIFY_LENGTH(_len, _minlen, _action) do { \ 46 if ((_len) < (_minlen)) { \ 47 IEEE80211_DISCARD(vap, IEEE80211_MSG_ELEMID, \ 48 wh, NULL, "ie too short, got %d, expected %d", \ 49 (_len), (_minlen)); \ 50 vap->iv_stats.is_rx_elem_toosmall++; \ 51 _action; \ 52 } \ 53 } while (0) 54 55 #ifdef IEEE80211_DEBUG 56 void ieee80211_ssid_mismatch(struct ieee80211vap *, const char *tag, 57 uint8_t mac[IEEE80211_ADDR_LEN], uint8_t *ssid); 58 59 #define IEEE80211_VERIFY_SSID(_ni, _ssid, _action) do { \ 60 if ((_ssid)[1] != 0 && \ 61 ((_ssid)[1] != (_ni)->ni_esslen || \ 62 memcmp((_ssid) + 2, (_ni)->ni_essid, (_ssid)[1]) != 0)) { \ 63 if (ieee80211_msg_input(vap)) \ 64 ieee80211_ssid_mismatch(vap, \ 65 ieee80211_mgt_subtype_name(subtype), \ 66 wh->i_addr2, _ssid); \ 67 vap->iv_stats.is_rx_ssidmismatch++; \ 68 _action; \ 69 } \ 70 } while (0) 71 #else /* !IEEE80211_DEBUG */ 72 #define IEEE80211_VERIFY_SSID(_ni, _ssid, _action) do { \ 73 if ((_ssid)[1] != 0 && \ 74 ((_ssid)[1] != (_ni)->ni_esslen || \ 75 memcmp((_ssid) + 2, (_ni)->ni_essid, (_ssid)[1]) != 0)) { \ 76 vap->iv_stats.is_rx_ssidmismatch++; \ 77 _action; \ 78 } \ 79 } while (0) 80 #endif /* !IEEE80211_DEBUG */ 81 82 #include <sys/endian.h> /* For le16toh() / le32dec() */ 83 84 static __inline int 85 iswpaoui(const uint8_t *frm) 86 { 87 return frm[1] > 3 && le32dec(frm+2) == ((WPA_OUI_TYPE<<24)|WPA_OUI); 88 } 89 90 static __inline int 91 iswmeoui(const uint8_t *frm) 92 { 93 return frm[1] > 3 && le32dec(frm+2) == ((WME_OUI_TYPE<<24)|WME_OUI); 94 } 95 96 static __inline int 97 iswmeparam(const uint8_t *frm) 98 { 99 return frm[1] > 5 && le32dec(frm+2) == ((WME_OUI_TYPE<<24)|WME_OUI) && 100 frm[6] == WME_PARAM_OUI_SUBTYPE; 101 } 102 103 static __inline int 104 iswmeinfo(const uint8_t *frm) 105 { 106 return frm[1] > 5 && le32dec(frm+2) == ((WME_OUI_TYPE<<24)|WME_OUI) && 107 frm[6] == WME_INFO_OUI_SUBTYPE; 108 } 109 110 static __inline int 111 isatherosoui(const uint8_t *frm) 112 { 113 return frm[1] > 3 && le32dec(frm+2) == ((ATH_OUI_TYPE<<24)|ATH_OUI); 114 } 115 116 static __inline int 117 istdmaoui(const uint8_t *frm) 118 { 119 return frm[1] > 3 && le32dec(frm+2) == ((TDMA_OUI_TYPE<<24)|TDMA_OUI); 120 } 121 122 static __inline int 123 ishtcapoui(const uint8_t *frm) 124 { 125 return frm[1] > 3 && le32dec(frm+2) == ((BCM_OUI_HTCAP<<24)|BCM_OUI); 126 } 127 128 static __inline int 129 ishtinfooui(const uint8_t *frm) 130 { 131 return frm[1] > 3 && le32dec(frm+2) == ((BCM_OUI_HTINFO<<24)|BCM_OUI); 132 } 133 134 static __inline int 135 ieee80211_check_rxseq_amsdu(const struct ieee80211_rx_stats *rxs) 136 { 137 if (rxs == NULL) 138 return 0; 139 return (!! (rxs->c_pktflags & IEEE80211_RX_F_AMSDU)); 140 } 141 142 /* 143 * Return 1 if the rxseq check should increment the sequence 144 * number. Return 0 if it's part of an AMSDU batch and it isn't 145 * the final frame in the decap'ed burst. 146 */ 147 static __inline int 148 ieee80211_check_rxseq_amsdu_more(const struct ieee80211_rx_stats *rxs) 149 { 150 /* No state? ok */ 151 if (rxs == NULL) 152 return (1); 153 154 /* State but no AMSDU set? ok */ 155 if ((rxs->c_pktflags & IEEE80211_RX_F_AMSDU) == 0) 156 return (1); 157 158 /* State, AMSDU set, then _MORE means "don't inc yet" */ 159 if (rxs->c_pktflags & IEEE80211_RX_F_AMSDU_MORE) { 160 return (0); 161 } 162 163 /* Both are set, so return ok */ 164 return (1); 165 } 166 167 /* 168 * Check the current frame sequence number against the current TID 169 * state and return whether it's in sequence or should be dropped. 170 * 171 * Since out of order packet and duplicate packet eliminations should 172 * be done by the AMPDU RX code, this routine blindly accepts all 173 * frames from a HT station w/ a TID that is currently doing AMPDU-RX. 174 * HT stations without WME or where the TID is not doing AMPDU-RX 175 * are checked like non-HT stations. 176 * 177 * The routine only eliminates packets whose sequence/fragment 178 * match or are less than the last seen sequence/fragment number 179 * AND are retransmits. It doesn't try to eliminate out of order packets. 180 * 181 * Since all frames after sequence number 4095 will be less than 4095 182 * (as the seqnum wraps), handle that special case so packets aren't 183 * incorrectly dropped - ie, if the next packet is sequence number 0 184 * but a retransmit since the initial packet didn't make it. 185 * 186 * XXX TODO: handle sequence number space wrapping with dropped frames; 187 * especially in high interference conditions under high traffic load 188 * The RX AMPDU reorder code also needs it. 189 * 190 * XXX TODO: update for 802.11-2012 9.3.2.10 Duplicate Detection and Recovery. 191 */ 192 static __inline int 193 ieee80211_check_rxseq(struct ieee80211_node *ni, struct ieee80211_frame *wh, 194 uint8_t *bssid, const struct ieee80211_rx_stats *rxs) 195 { 196 #define SEQ_LEQ(a,b) ((int)((a)-(b)) <= 0) 197 #define SEQ_EQ(a,b) ((int)((a)-(b)) == 0) 198 #define SEQNO(a) ((a) >> IEEE80211_SEQ_SEQ_SHIFT) 199 #define FRAGNO(a) ((a) & IEEE80211_SEQ_FRAG_MASK) 200 struct ieee80211vap *vap = ni->ni_vap; 201 uint16_t rxseq; 202 uint8_t type, subtype; 203 uint8_t tid; 204 struct ieee80211_rx_ampdu *rap; 205 206 rxseq = le16toh(*(uint16_t *)wh->i_seq); 207 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK; 208 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK; 209 210 /* 211 * Types with no sequence number (or QoS (+)Null frames) 212 * are always treated valid. 213 */ 214 if (! IEEE80211_HAS_SEQ(type, subtype)) 215 return 1; 216 217 /* 218 * Always allow multicast frames for now - QoS (any TID) 219 * or not. 220 */ 221 if (IEEE80211_IS_MULTICAST(wh->i_addr1)) 222 return 1; 223 224 tid = ieee80211_gettid(wh); 225 226 /* 227 * Only do the HT AMPDU check for WME stations; non-WME HT stations 228 * shouldn't exist outside of debugging. We should at least 229 * handle that. 230 */ 231 if (tid < WME_NUM_TID) { 232 rap = &ni->ni_rx_ampdu[tid]; 233 /* HT nodes currently doing RX AMPDU are always valid */ 234 if ((ni->ni_flags & IEEE80211_NODE_HT) && 235 (rap->rxa_flags & IEEE80211_AGGR_RUNNING)) 236 goto ok; 237 } 238 239 /* 240 * Otherwise, retries for packets below or equal to the last 241 * seen sequence number should be dropped. 242 */ 243 244 /* 245 * Treat frame seqnum 4095 as special due to boundary 246 * wrapping conditions. 247 */ 248 if (SEQNO(ni->ni_rxseqs[tid]) == 4095) { 249 /* 250 * Drop retransmits on seqnum 4095/current fragment for itself. 251 */ 252 if (SEQ_EQ(rxseq, ni->ni_rxseqs[tid]) && 253 (wh->i_fc[1] & IEEE80211_FC1_RETRY)) 254 goto fail; 255 /* 256 * Treat any subsequent frame as fine if the last seen frame 257 * is 4095 and it's not a retransmit for the same sequence 258 * number. However, this doesn't capture incorrectly ordered 259 * fragments w/ sequence number 4095. It shouldn't be seen 260 * in practice, but see the comment above for further info. 261 */ 262 goto ok; 263 } 264 265 /* 266 * At this point we assume that retransmitted seq/frag numbers below 267 * the current can simply be eliminated. 268 */ 269 if ((wh->i_fc[1] & IEEE80211_FC1_RETRY) && 270 SEQ_LEQ(rxseq, ni->ni_rxseqs[tid])) 271 goto fail; 272 273 ok: 274 /* 275 * Only bump the sequence number if it's the last frame 276 * in a batch. That way frames in the rest of the batch 277 * get included, and the last frame in the batch kicks 278 * it next. 279 */ 280 if (ieee80211_check_rxseq_amsdu_more(rxs)) { 281 ni->ni_rxseqs[tid] = rxseq; 282 if ((rxs != NULL) && ieee80211_check_rxseq_amsdu(rxs)) 283 IEEE80211_NODE_STAT(ni, rx_amsdu_more_end); 284 } else { 285 /* .. still waiting */ 286 IEEE80211_NODE_STAT(ni, rx_amsdu_more); 287 } 288 289 return 1; 290 291 fail: 292 /* duplicate, discard */ 293 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, bssid, "duplicate", 294 "seqno <%u,%u> fragno <%u,%u> tid %u", 295 SEQNO(rxseq), SEQNO(ni->ni_rxseqs[tid]), 296 FRAGNO(rxseq), FRAGNO(ni->ni_rxseqs[tid]), tid); 297 vap->iv_stats.is_rx_dup++; 298 IEEE80211_NODE_STAT(ni, rx_dup); 299 300 return 0; 301 #undef SEQ_LEQ 302 #undef SEQ_EQ 303 #undef SEQNO 304 #undef FRAGNO 305 } 306 307 void ieee80211_deliver_data(struct ieee80211vap *, 308 struct ieee80211_node *, struct mbuf *); 309 struct mbuf *ieee80211_defrag(struct ieee80211_node *, 310 struct mbuf *, int, int); 311 struct mbuf *ieee80211_realign(struct ieee80211vap *, struct mbuf *, size_t); 312 struct mbuf *ieee80211_decap(struct ieee80211vap *, struct mbuf *, int, 313 uint8_t); 314 struct mbuf *ieee80211_decap1(struct mbuf *, int *); 315 int ieee80211_setup_rates(struct ieee80211_node *ni, 316 const uint8_t *rates, const uint8_t *xrates, int flags); 317 void ieee80211_send_error(struct ieee80211_node *, 318 const uint8_t mac[IEEE80211_ADDR_LEN], int subtype, int arg); 319 int ieee80211_alloc_challenge(struct ieee80211_node *); 320 int ieee80211_parse_beacon(struct ieee80211_node *, struct mbuf *, 321 struct ieee80211_channel *, 322 struct ieee80211_scanparams *); 323 int ieee80211_parse_action(struct ieee80211_node *, struct mbuf *); 324 #endif /* _NET80211_IEEE80211_INPUT_H_ */ 325