1 /*- 2 * Copyright (c) 2007-2009 Sam Leffler, Errno Consulting 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 17 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 * 25 * $FreeBSD$ 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 %ld, expected %ld", \ 49 (long)(_len), (long)(_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 #include <sys/types.h> 84 85 static __inline int 86 iswpaoui(const uint8_t *frm) 87 { 88 return frm[1] > 3 && le32dec(frm+2) == ((WPA_OUI_TYPE<<24)|WPA_OUI); 89 } 90 91 static __inline int 92 iswmeoui(const uint8_t *frm) 93 { 94 return frm[1] > 3 && le32dec(frm+2) == ((WME_OUI_TYPE<<24)|WME_OUI); 95 } 96 97 static __inline int 98 iswmeparam(const uint8_t *frm) 99 { 100 return frm[1] > 5 && le32dec(frm+2) == ((WME_OUI_TYPE<<24)|WME_OUI) && 101 frm[6] == WME_PARAM_OUI_SUBTYPE; 102 } 103 104 static __inline int 105 iswmeinfo(const uint8_t *frm) 106 { 107 return frm[1] > 5 && le32dec(frm+2) == ((WME_OUI_TYPE<<24)|WME_OUI) && 108 frm[6] == WME_INFO_OUI_SUBTYPE; 109 } 110 111 static __inline int 112 isatherosoui(const uint8_t *frm) 113 { 114 return frm[1] > 3 && le32dec(frm+2) == ((ATH_OUI_TYPE<<24)|ATH_OUI); 115 } 116 117 static __inline int 118 istdmaoui(const uint8_t *frm) 119 { 120 return frm[1] > 3 && le32dec(frm+2) == ((TDMA_OUI_TYPE<<24)|TDMA_OUI); 121 } 122 123 static __inline int 124 ishtcapoui(const uint8_t *frm) 125 { 126 return frm[1] > 3 && le32dec(frm+2) == ((BCM_OUI_HTCAP<<24)|BCM_OUI); 127 } 128 129 static __inline int 130 ishtinfooui(const uint8_t *frm) 131 { 132 return frm[1] > 3 && le32dec(frm+2) == ((BCM_OUI_HTINFO<<24)|BCM_OUI); 133 } 134 135 /* 136 * Check the current frame sequence number against the current TID 137 * state and return whether it's in sequence or should be dropped. 138 * 139 * Since out of order packet and duplicate packet eliminations should 140 * be done by the AMPDU RX code, this routine blindly accepts all 141 * frames from a HT station w/ a TID that is currently doing AMPDU-RX. 142 * HT stations without WME or where the TID is not doing AMPDU-RX 143 * are checked like non-HT stations. 144 * 145 * The routine only eliminates packets whose sequence/fragment 146 * match or are less than the last seen sequence/fragment number 147 * AND are retransmits It doesn't try to eliminate out of order packets. 148 * 149 * Since all frames after sequence number 4095 will be less than 4095 150 * (as the seqnum wraps), handle that special case so packets aren't 151 * incorrectly dropped - ie, if the next packet is sequence number 0 152 * but a retransmit since the initial packet didn't make it. 153 */ 154 static __inline int 155 ieee80211_check_rxseq(struct ieee80211_node *ni, struct ieee80211_frame *wh, 156 uint8_t *bssid) 157 { 158 #define SEQ_LEQ(a,b) ((int)((a)-(b)) <= 0) 159 #define SEQ_EQ(a,b) ((int)((a)-(b)) == 0) 160 #define SEQNO(a) ((a) >> IEEE80211_SEQ_SEQ_SHIFT) 161 #define FRAGNO(a) ((a) & IEEE80211_SEQ_FRAG_MASK) 162 struct ieee80211vap *vap = ni->ni_vap; 163 uint16_t rxseq; 164 uint8_t type, subtype; 165 uint8_t tid; 166 struct ieee80211_rx_ampdu *rap; 167 168 rxseq = le16toh(*(uint16_t *)wh->i_seq); 169 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK; 170 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK; 171 172 /* 173 * Types with no sequence number (or QoS (+)Null frames) 174 * are always treated valid. 175 */ 176 if (! IEEE80211_HAS_SEQ(type, subtype)) 177 return 1; 178 179 tid = ieee80211_gettid(wh); 180 181 /* 182 * Only do the HT AMPDU check for WME stations; non-WME HT stations 183 * shouldn't exist outside of debugging. We should at least 184 * handle that. 185 */ 186 if (tid < WME_NUM_TID) { 187 rap = &ni->ni_rx_ampdu[tid]; 188 /* HT nodes currently doing RX AMPDU are always valid */ 189 if ((ni->ni_flags & IEEE80211_NODE_HT) && 190 (rap->rxa_flags & IEEE80211_AGGR_RUNNING)) 191 goto ok; 192 } 193 194 /* 195 * Otherwise, retries for packets below or equal to the last 196 * seen sequence number should be dropped. 197 */ 198 199 /* 200 * Treat frame seqnum 4095 as special due to boundary 201 * wrapping conditions. 202 */ 203 if (SEQNO(ni->ni_rxseqs[tid]) == 4095) { 204 /* 205 * Drop retransmits on seqnum 4095/current fragment for itself. 206 */ 207 if (SEQ_EQ(rxseq, ni->ni_rxseqs[tid]) && 208 (wh->i_fc[1] & IEEE80211_FC1_RETRY)) 209 goto fail; 210 /* 211 * Treat any subsequent frame as fine if the last seen frame 212 * is 4095 and it's not a retransmit for the same sequence 213 * number. However, this doesn't capture incorrectly ordered 214 * fragments w/ sequence number 4095. It shouldn't be seen 215 * in practice, but see the comment above for further info. 216 */ 217 goto ok; 218 } 219 220 /* 221 * At this point we assume that retransmitted seq/frag numbers below 222 * the current can simply be eliminated. 223 */ 224 if ((wh->i_fc[1] & IEEE80211_FC1_RETRY) && 225 SEQ_LEQ(rxseq, ni->ni_rxseqs[tid])) 226 goto fail; 227 228 ok: 229 ni->ni_rxseqs[tid] = rxseq; 230 231 return 1; 232 233 fail: 234 /* duplicate, discard */ 235 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, bssid, "duplicate", 236 "seqno <%u,%u> fragno <%u,%u> tid %u", 237 SEQNO(rxseq), SEQNO(ni->ni_rxseqs[tid]), 238 FRAGNO(rxseq), FRAGNO(ni->ni_rxseqs[tid]), tid); 239 vap->iv_stats.is_rx_dup++; 240 IEEE80211_NODE_STAT(ni, rx_dup); 241 242 return 0; 243 #undef SEQ_LEQ 244 #undef SEQ_EQ 245 #undef SEQNO 246 #undef FRAGNO 247 } 248 249 void ieee80211_deliver_data(struct ieee80211vap *, 250 struct ieee80211_node *, struct mbuf *); 251 struct mbuf *ieee80211_defrag(struct ieee80211_node *, 252 struct mbuf *, int); 253 struct mbuf *ieee80211_realign(struct ieee80211vap *, struct mbuf *, size_t); 254 struct mbuf *ieee80211_decap(struct ieee80211vap *, struct mbuf *, int); 255 struct mbuf *ieee80211_decap1(struct mbuf *, int *); 256 int ieee80211_setup_rates(struct ieee80211_node *ni, 257 const uint8_t *rates, const uint8_t *xrates, int flags); 258 void ieee80211_send_error(struct ieee80211_node *, 259 const uint8_t mac[IEEE80211_ADDR_LEN], int subtype, int arg); 260 int ieee80211_alloc_challenge(struct ieee80211_node *); 261 int ieee80211_parse_beacon(struct ieee80211_node *, struct mbuf *, 262 struct ieee80211_channel *, 263 struct ieee80211_scanparams *); 264 int ieee80211_parse_action(struct ieee80211_node *, struct mbuf *); 265 #endif /* _NET80211_IEEE80211_INPUT_H_ */ 266