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 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 /* 135 * Check the current frame sequence number against the current TID 136 * state and return whether it's in sequence or should be dropped. 137 * 138 * Since out of order packet and duplicate packet eliminations should 139 * be done by the AMPDU RX code, this routine blindly accepts all 140 * frames from a HT station w/ a TID that is currently doing AMPDU-RX. 141 * HT stations without WME or where the TID is not doing AMPDU-RX 142 * are checked like non-HT stations. 143 * 144 * The routine only eliminates packets whose sequence/fragment 145 * match or are less than the last seen sequence/fragment number 146 * AND are retransmits It doesn't try to eliminate out of order packets. 147 * 148 * Since all frames after sequence number 4095 will be less than 4095 149 * (as the seqnum wraps), handle that special case so packets aren't 150 * incorrectly dropped - ie, if the next packet is sequence number 0 151 * but a retransmit since the initial packet didn't make it. 152 */ 153 static __inline int 154 ieee80211_check_rxseq(struct ieee80211_node *ni, struct ieee80211_frame *wh, 155 uint8_t *bssid) 156 { 157 #define SEQ_LEQ(a,b) ((int)((a)-(b)) <= 0) 158 #define SEQ_EQ(a,b) ((int)((a)-(b)) == 0) 159 #define SEQNO(a) ((a) >> IEEE80211_SEQ_SEQ_SHIFT) 160 #define FRAGNO(a) ((a) & IEEE80211_SEQ_FRAG_MASK) 161 struct ieee80211vap *vap = ni->ni_vap; 162 uint16_t rxseq; 163 uint8_t type, subtype; 164 uint8_t tid; 165 struct ieee80211_rx_ampdu *rap; 166 167 rxseq = le16toh(*(uint16_t *)wh->i_seq); 168 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK; 169 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK; 170 171 /* 172 * Types with no sequence number (or QoS (+)Null frames) 173 * are always treated valid. 174 */ 175 if (! IEEE80211_HAS_SEQ(type, subtype)) 176 return 1; 177 178 tid = ieee80211_gettid(wh); 179 180 /* 181 * Only do the HT AMPDU check for WME stations; non-WME HT stations 182 * shouldn't exist outside of debugging. We should at least 183 * handle that. 184 */ 185 if (tid < WME_NUM_TID) { 186 rap = &ni->ni_rx_ampdu[tid]; 187 /* HT nodes currently doing RX AMPDU are always valid */ 188 if ((ni->ni_flags & IEEE80211_NODE_HT) && 189 (rap->rxa_flags & IEEE80211_AGGR_RUNNING)) 190 goto ok; 191 } 192 193 /* 194 * Otherwise, retries for packets below or equal to the last 195 * seen sequence number should be dropped. 196 */ 197 198 /* 199 * Treat frame seqnum 4095 as special due to boundary 200 * wrapping conditions. 201 */ 202 if (SEQNO(ni->ni_rxseqs[tid]) == 4095) { 203 /* 204 * Drop retransmits on seqnum 4095/current fragment for itself. 205 */ 206 if (SEQ_EQ(rxseq, ni->ni_rxseqs[tid]) && 207 (wh->i_fc[1] & IEEE80211_FC1_RETRY)) 208 goto fail; 209 /* 210 * Treat any subsequent frame as fine if the last seen frame 211 * is 4095 and it's not a retransmit for the same sequence 212 * number. However, this doesn't capture incorrectly ordered 213 * fragments w/ sequence number 4095. It shouldn't be seen 214 * in practice, but see the comment above for further info. 215 */ 216 goto ok; 217 } 218 219 /* 220 * At this point we assume that retransmitted seq/frag numbers below 221 * the current can simply be eliminated. 222 */ 223 if ((wh->i_fc[1] & IEEE80211_FC1_RETRY) && 224 SEQ_LEQ(rxseq, ni->ni_rxseqs[tid])) 225 goto fail; 226 227 ok: 228 ni->ni_rxseqs[tid] = rxseq; 229 230 return 1; 231 232 fail: 233 /* duplicate, discard */ 234 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, bssid, "duplicate", 235 "seqno <%u,%u> fragno <%u,%u> tid %u", 236 SEQNO(rxseq), SEQNO(ni->ni_rxseqs[tid]), 237 FRAGNO(rxseq), FRAGNO(ni->ni_rxseqs[tid]), tid); 238 vap->iv_stats.is_rx_dup++; 239 IEEE80211_NODE_STAT(ni, rx_dup); 240 241 return 0; 242 #undef SEQ_LEQ 243 #undef SEQ_EQ 244 #undef SEQNO 245 #undef FRAGNO 246 } 247 248 void ieee80211_deliver_data(struct ieee80211vap *, 249 struct ieee80211_node *, struct mbuf *); 250 struct mbuf *ieee80211_defrag(struct ieee80211_node *, 251 struct mbuf *, int); 252 struct mbuf *ieee80211_realign(struct ieee80211vap *, struct mbuf *, size_t); 253 struct mbuf *ieee80211_decap(struct ieee80211vap *, struct mbuf *, int); 254 struct mbuf *ieee80211_decap1(struct mbuf *, int *); 255 int ieee80211_setup_rates(struct ieee80211_node *ni, 256 const uint8_t *rates, const uint8_t *xrates, int flags); 257 void ieee80211_send_error(struct ieee80211_node *, 258 const uint8_t mac[IEEE80211_ADDR_LEN], int subtype, int arg); 259 int ieee80211_alloc_challenge(struct ieee80211_node *); 260 int ieee80211_parse_beacon(struct ieee80211_node *, struct mbuf *, 261 struct ieee80211_channel *, 262 struct ieee80211_scanparams *); 263 int ieee80211_parse_action(struct ieee80211_node *, struct mbuf *); 264 #endif /* _NET80211_IEEE80211_INPUT_H_ */ 265