1 /*- 2 * Copyright (c) 2003-2005 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 * 3. The name of the author may not be used to endorse or promote products 14 * derived from this software without specific prior written permission. 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 28 #include <sys/cdefs.h> 29 __FBSDID("$FreeBSD$"); 30 31 /* 32 * IEEE 802.11 support (FreeBSD-specific code) 33 */ 34 #include <sys/param.h> 35 #include <sys/kernel.h> 36 #include <sys/systm.h> 37 #include <sys/linker.h> 38 #include <sys/mbuf.h> 39 #include <sys/module.h> 40 #include <sys/proc.h> 41 #include <sys/sysctl.h> 42 43 #include <sys/socket.h> 44 45 #include <net/if.h> 46 #include <net/if_media.h> 47 #include <net/ethernet.h> 48 #include <net/route.h> 49 50 #include <net80211/ieee80211_var.h> 51 52 SYSCTL_NODE(_net, OID_AUTO, wlan, CTLFLAG_RD, 0, "IEEE 80211 parameters"); 53 54 #ifdef IEEE80211_DEBUG 55 int ieee80211_debug = 0; 56 SYSCTL_INT(_net_wlan, OID_AUTO, debug, CTLFLAG_RW, &ieee80211_debug, 57 0, "debugging printfs"); 58 #endif 59 60 static int 61 ieee80211_sysctl_inact(SYSCTL_HANDLER_ARGS) 62 { 63 int inact = (*(int *)arg1) * IEEE80211_INACT_WAIT; 64 int error; 65 66 error = sysctl_handle_int(oidp, &inact, 0, req); 67 if (error || !req->newptr) 68 return error; 69 *(int *)arg1 = inact / IEEE80211_INACT_WAIT; 70 return 0; 71 } 72 73 static int 74 ieee80211_sysctl_parent(SYSCTL_HANDLER_ARGS) 75 { 76 struct ieee80211com *ic = arg1; 77 const char *name = ic->ic_ifp->if_xname; 78 79 return SYSCTL_OUT(req, name, strlen(name)); 80 } 81 82 void 83 ieee80211_sysctl_attach(struct ieee80211com *ic) 84 { 85 struct sysctl_ctx_list *ctx; 86 struct sysctl_oid *oid; 87 char num[14]; /* sufficient for 32 bits */ 88 89 MALLOC(ctx, struct sysctl_ctx_list *, sizeof(struct sysctl_ctx_list), 90 M_DEVBUF, M_NOWAIT | M_ZERO); 91 if (ctx == NULL) { 92 if_printf(ic->ic_ifp, "%s: cannot allocate sysctl context!\n", 93 __func__); 94 return; 95 } 96 sysctl_ctx_init(ctx); 97 snprintf(num, sizeof(num), "%u", ic->ic_vap); 98 oid = SYSCTL_ADD_NODE(ctx, &SYSCTL_NODE_CHILDREN(_net, wlan), 99 OID_AUTO, num, CTLFLAG_RD, NULL, ""); 100 SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(oid), OID_AUTO, 101 "%parent", CTLFLAG_RD, ic, 0, ieee80211_sysctl_parent, "A", 102 "parent device"); 103 #ifdef IEEE80211_DEBUG 104 ic->ic_debug = ieee80211_debug; 105 SYSCTL_ADD_INT(ctx, SYSCTL_CHILDREN(oid), OID_AUTO, 106 "debug", CTLFLAG_RW, &ic->ic_debug, 0, 107 "control debugging printfs"); 108 #endif 109 /* XXX inherit from tunables */ 110 SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(oid), OID_AUTO, 111 "inact_run", CTLTYPE_INT | CTLFLAG_RW, &ic->ic_inact_run, 0, 112 ieee80211_sysctl_inact, "I", 113 "station inactivity timeout (sec)"); 114 SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(oid), OID_AUTO, 115 "inact_probe", CTLTYPE_INT | CTLFLAG_RW, &ic->ic_inact_probe, 0, 116 ieee80211_sysctl_inact, "I", 117 "station inactivity probe timeout (sec)"); 118 SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(oid), OID_AUTO, 119 "inact_auth", CTLTYPE_INT | CTLFLAG_RW, &ic->ic_inact_auth, 0, 120 ieee80211_sysctl_inact, "I", 121 "station authentication timeout (sec)"); 122 SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(oid), OID_AUTO, 123 "inact_init", CTLTYPE_INT | CTLFLAG_RW, &ic->ic_inact_init, 0, 124 ieee80211_sysctl_inact, "I", 125 "station initial state timeout (sec)"); 126 SYSCTL_ADD_INT(ctx, SYSCTL_CHILDREN(oid), OID_AUTO, 127 "driver_caps", CTLFLAG_RW, &ic->ic_caps, 0, 128 "driver capabilities"); 129 SYSCTL_ADD_INT(ctx, SYSCTL_CHILDREN(oid), OID_AUTO, 130 "bmiss_max", CTLFLAG_RW, &ic->ic_bmiss_max, 0, 131 "consecutive beacon misses before scanning"); 132 ic->ic_sysctl = ctx; 133 } 134 135 void 136 ieee80211_sysctl_detach(struct ieee80211com *ic) 137 { 138 139 if (ic->ic_sysctl != NULL) { 140 sysctl_ctx_free(ic->ic_sysctl); 141 ic->ic_sysctl = NULL; 142 } 143 } 144 145 int 146 ieee80211_node_dectestref(struct ieee80211_node *ni) 147 { 148 /* XXX need equivalent of atomic_dec_and_test */ 149 atomic_subtract_int(&ni->ni_refcnt, 1); 150 return atomic_cmpset_int(&ni->ni_refcnt, 0, 1); 151 } 152 153 /* 154 * Allocate and setup a management frame of the specified 155 * size. We return the mbuf and a pointer to the start 156 * of the contiguous data area that's been reserved based 157 * on the packet length. The data area is forced to 32-bit 158 * alignment and the buffer length to a multiple of 4 bytes. 159 * This is done mainly so beacon frames (that require this) 160 * can use this interface too. 161 */ 162 struct mbuf * 163 ieee80211_getmgtframe(u_int8_t **frm, u_int pktlen) 164 { 165 struct mbuf *m; 166 u_int len; 167 168 /* 169 * NB: we know the mbuf routines will align the data area 170 * so we don't need to do anything special. 171 */ 172 /* XXX 4-address frame? */ 173 len = roundup(sizeof(struct ieee80211_frame) + pktlen, 4); 174 KASSERT(len <= MCLBYTES, ("802.11 mgt frame too large: %u", len)); 175 if (len < MINCLSIZE) { 176 m = m_gethdr(M_NOWAIT, MT_DATA); 177 /* 178 * Align the data in case additional headers are added. 179 * This should only happen when a WEP header is added 180 * which only happens for shared key authentication mgt 181 * frames which all fit in MHLEN. 182 */ 183 if (m != NULL) 184 MH_ALIGN(m, len); 185 } else 186 m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR); 187 if (m != NULL) { 188 m->m_data += sizeof(struct ieee80211_frame); 189 *frm = m->m_data; 190 } 191 return m; 192 } 193 194 #include <sys/libkern.h> 195 196 void 197 get_random_bytes(void *p, size_t n) 198 { 199 u_int8_t *dp = p; 200 201 while (n > 0) { 202 u_int32_t v = arc4random(); 203 size_t nb = n > sizeof(u_int32_t) ? sizeof(u_int32_t) : n; 204 bcopy(&v, dp, n > sizeof(u_int32_t) ? sizeof(u_int32_t) : n); 205 dp += sizeof(u_int32_t), n -= nb; 206 } 207 } 208 209 void 210 ieee80211_notify_node_join(struct ieee80211com *ic, struct ieee80211_node *ni, int newassoc) 211 { 212 struct ifnet *ifp = ic->ic_ifp; 213 struct ieee80211_join_event iev; 214 215 memset(&iev, 0, sizeof(iev)); 216 if (ni == ic->ic_bss) { 217 IEEE80211_ADDR_COPY(iev.iev_addr, ni->ni_bssid); 218 rt_ieee80211msg(ifp, newassoc ? 219 RTM_IEEE80211_ASSOC : RTM_IEEE80211_REASSOC, 220 &iev, sizeof(iev)); 221 if_link_state_change(ifp, LINK_STATE_UP); 222 } else { 223 IEEE80211_ADDR_COPY(iev.iev_addr, ni->ni_macaddr); 224 rt_ieee80211msg(ifp, newassoc ? 225 RTM_IEEE80211_JOIN : RTM_IEEE80211_REJOIN, 226 &iev, sizeof(iev)); 227 } 228 } 229 230 void 231 ieee80211_notify_node_leave(struct ieee80211com *ic, struct ieee80211_node *ni) 232 { 233 struct ifnet *ifp = ic->ic_ifp; 234 struct ieee80211_leave_event iev; 235 236 if (ni == ic->ic_bss) { 237 rt_ieee80211msg(ifp, RTM_IEEE80211_DISASSOC, NULL, 0); 238 if_link_state_change(ifp, LINK_STATE_DOWN); 239 } else { 240 /* fire off wireless event station leaving */ 241 memset(&iev, 0, sizeof(iev)); 242 IEEE80211_ADDR_COPY(iev.iev_addr, ni->ni_macaddr); 243 rt_ieee80211msg(ifp, RTM_IEEE80211_LEAVE, &iev, sizeof(iev)); 244 } 245 } 246 247 void 248 ieee80211_notify_scan_done(struct ieee80211com *ic) 249 { 250 struct ifnet *ifp = ic->ic_ifp; 251 252 IEEE80211_DPRINTF(ic, IEEE80211_MSG_SCAN, "%s\n", "notify scan done"); 253 254 /* dispatch wireless event indicating scan completed */ 255 rt_ieee80211msg(ifp, RTM_IEEE80211_SCAN, NULL, 0); 256 } 257 258 void 259 ieee80211_notify_replay_failure(struct ieee80211com *ic, 260 const struct ieee80211_frame *wh, const struct ieee80211_key *k, 261 u_int64_t rsc) 262 { 263 struct ifnet *ifp = ic->ic_ifp; 264 265 IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO, 266 "[%s] %s replay detected <rsc %ju, csc %ju, keyix %u rxkeyix %u>\n", 267 ether_sprintf(wh->i_addr2), k->wk_cipher->ic_name, 268 (intmax_t) rsc, (intmax_t) k->wk_keyrsc, 269 k->wk_keyix, k->wk_rxkeyix); 270 271 if (ifp != NULL) { /* NB: for cipher test modules */ 272 struct ieee80211_replay_event iev; 273 274 IEEE80211_ADDR_COPY(iev.iev_dst, wh->i_addr1); 275 IEEE80211_ADDR_COPY(iev.iev_src, wh->i_addr2); 276 iev.iev_cipher = k->wk_cipher->ic_cipher; 277 if (k->wk_rxkeyix != IEEE80211_KEYIX_NONE) 278 iev.iev_keyix = k->wk_rxkeyix; 279 else 280 iev.iev_keyix = k->wk_keyix; 281 iev.iev_keyrsc = k->wk_keyrsc; 282 iev.iev_rsc = rsc; 283 rt_ieee80211msg(ifp, RTM_IEEE80211_REPLAY, &iev, sizeof(iev)); 284 } 285 } 286 287 void 288 ieee80211_notify_michael_failure(struct ieee80211com *ic, 289 const struct ieee80211_frame *wh, u_int keyix) 290 { 291 struct ifnet *ifp = ic->ic_ifp; 292 293 IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO, 294 "[%s] michael MIC verification failed <keyix %u>\n", 295 ether_sprintf(wh->i_addr2), keyix); 296 ic->ic_stats.is_rx_tkipmic++; 297 298 if (ifp != NULL) { /* NB: for cipher test modules */ 299 struct ieee80211_michael_event iev; 300 301 IEEE80211_ADDR_COPY(iev.iev_dst, wh->i_addr1); 302 IEEE80211_ADDR_COPY(iev.iev_src, wh->i_addr2); 303 iev.iev_cipher = IEEE80211_CIPHER_TKIP; 304 iev.iev_keyix = keyix; 305 rt_ieee80211msg(ifp, RTM_IEEE80211_MICHAEL, &iev, sizeof(iev)); 306 } 307 } 308 309 void 310 ieee80211_load_module(const char *modname) 311 { 312 313 #ifdef notyet 314 (void)kern_kldload(curthread, modname, NULL); 315 #else 316 printf("%s: load the %s module by hand for now.\n", __func__, modname); 317 #endif 318 } 319 320 /* 321 * Module glue. 322 * 323 * NB: the module name is "wlan" for compatibility with NetBSD. 324 */ 325 static int 326 wlan_modevent(module_t mod, int type, void *unused) 327 { 328 switch (type) { 329 case MOD_LOAD: 330 if (bootverbose) 331 printf("wlan: <802.11 Link Layer>\n"); 332 return 0; 333 case MOD_UNLOAD: 334 return 0; 335 } 336 return EINVAL; 337 } 338 339 static moduledata_t wlan_mod = { 340 "wlan", 341 wlan_modevent, 342 0 343 }; 344 DECLARE_MODULE(wlan, wlan_mod, SI_SUB_DRIVERS, SI_ORDER_FIRST); 345 MODULE_VERSION(wlan, 1); 346 MODULE_DEPEND(wlan, ether, 1, 1, 1); 347