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 void 154 ieee80211_drain_ifq(struct ifqueue *ifq) 155 { 156 struct ieee80211_node *ni; 157 struct mbuf *m; 158 159 for (;;) { 160 IF_DEQUEUE(ifq, m); 161 if (m == NULL) 162 break; 163 164 ni = (struct ieee80211_node *)m->m_pkthdr.rcvif; 165 KASSERT(ni != NULL, ("frame w/o node")); 166 ieee80211_free_node(ni); 167 m->m_pkthdr.rcvif = NULL; 168 169 m_freem(m); 170 } 171 } 172 173 /* 174 * Allocate and setup a management frame of the specified 175 * size. We return the mbuf and a pointer to the start 176 * of the contiguous data area that's been reserved based 177 * on the packet length. The data area is forced to 32-bit 178 * alignment and the buffer length to a multiple of 4 bytes. 179 * This is done mainly so beacon frames (that require this) 180 * can use this interface too. 181 */ 182 struct mbuf * 183 ieee80211_getmgtframe(u_int8_t **frm, u_int pktlen) 184 { 185 struct mbuf *m; 186 u_int len; 187 188 /* 189 * NB: we know the mbuf routines will align the data area 190 * so we don't need to do anything special. 191 */ 192 /* XXX 4-address frame? */ 193 len = roundup(sizeof(struct ieee80211_frame) + pktlen, 4); 194 KASSERT(len <= MCLBYTES, ("802.11 mgt frame too large: %u", len)); 195 if (len < MINCLSIZE) { 196 m = m_gethdr(M_NOWAIT, MT_DATA); 197 /* 198 * Align the data in case additional headers are added. 199 * This should only happen when a WEP header is added 200 * which only happens for shared key authentication mgt 201 * frames which all fit in MHLEN. 202 */ 203 if (m != NULL) 204 MH_ALIGN(m, len); 205 } else 206 m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR); 207 if (m != NULL) { 208 m->m_data += sizeof(struct ieee80211_frame); 209 *frm = m->m_data; 210 } 211 return m; 212 } 213 214 #include <sys/libkern.h> 215 216 void 217 get_random_bytes(void *p, size_t n) 218 { 219 u_int8_t *dp = p; 220 221 while (n > 0) { 222 u_int32_t v = arc4random(); 223 size_t nb = n > sizeof(u_int32_t) ? sizeof(u_int32_t) : n; 224 bcopy(&v, dp, n > sizeof(u_int32_t) ? sizeof(u_int32_t) : n); 225 dp += sizeof(u_int32_t), n -= nb; 226 } 227 } 228 229 void 230 ieee80211_notify_node_join(struct ieee80211com *ic, struct ieee80211_node *ni, int newassoc) 231 { 232 struct ifnet *ifp = ic->ic_ifp; 233 struct ieee80211_join_event iev; 234 235 memset(&iev, 0, sizeof(iev)); 236 if (ni == ic->ic_bss) { 237 IEEE80211_ADDR_COPY(iev.iev_addr, ni->ni_bssid); 238 rt_ieee80211msg(ifp, newassoc ? 239 RTM_IEEE80211_ASSOC : RTM_IEEE80211_REASSOC, 240 &iev, sizeof(iev)); 241 if_link_state_change(ifp, LINK_STATE_UP); 242 } else { 243 IEEE80211_ADDR_COPY(iev.iev_addr, ni->ni_macaddr); 244 rt_ieee80211msg(ifp, newassoc ? 245 RTM_IEEE80211_JOIN : RTM_IEEE80211_REJOIN, 246 &iev, sizeof(iev)); 247 } 248 } 249 250 void 251 ieee80211_notify_node_leave(struct ieee80211com *ic, struct ieee80211_node *ni) 252 { 253 struct ifnet *ifp = ic->ic_ifp; 254 struct ieee80211_leave_event iev; 255 256 if (ni == ic->ic_bss) { 257 rt_ieee80211msg(ifp, RTM_IEEE80211_DISASSOC, NULL, 0); 258 if_link_state_change(ifp, LINK_STATE_DOWN); 259 } else { 260 /* fire off wireless event station leaving */ 261 memset(&iev, 0, sizeof(iev)); 262 IEEE80211_ADDR_COPY(iev.iev_addr, ni->ni_macaddr); 263 rt_ieee80211msg(ifp, RTM_IEEE80211_LEAVE, &iev, sizeof(iev)); 264 } 265 } 266 267 void 268 ieee80211_notify_scan_done(struct ieee80211com *ic) 269 { 270 struct ifnet *ifp = ic->ic_ifp; 271 272 IEEE80211_DPRINTF(ic, IEEE80211_MSG_SCAN, "%s\n", "notify scan done"); 273 274 /* dispatch wireless event indicating scan completed */ 275 rt_ieee80211msg(ifp, RTM_IEEE80211_SCAN, NULL, 0); 276 } 277 278 void 279 ieee80211_notify_replay_failure(struct ieee80211com *ic, 280 const struct ieee80211_frame *wh, const struct ieee80211_key *k, 281 u_int64_t rsc) 282 { 283 struct ifnet *ifp = ic->ic_ifp; 284 285 IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO, 286 "[%s] %s replay detected <rsc %ju, csc %ju, keyix %u rxkeyix %u>\n", 287 ether_sprintf(wh->i_addr2), k->wk_cipher->ic_name, 288 (intmax_t) rsc, (intmax_t) k->wk_keyrsc, 289 k->wk_keyix, k->wk_rxkeyix); 290 291 if (ifp != NULL) { /* NB: for cipher test modules */ 292 struct ieee80211_replay_event iev; 293 294 IEEE80211_ADDR_COPY(iev.iev_dst, wh->i_addr1); 295 IEEE80211_ADDR_COPY(iev.iev_src, wh->i_addr2); 296 iev.iev_cipher = k->wk_cipher->ic_cipher; 297 if (k->wk_rxkeyix != IEEE80211_KEYIX_NONE) 298 iev.iev_keyix = k->wk_rxkeyix; 299 else 300 iev.iev_keyix = k->wk_keyix; 301 iev.iev_keyrsc = k->wk_keyrsc; 302 iev.iev_rsc = rsc; 303 rt_ieee80211msg(ifp, RTM_IEEE80211_REPLAY, &iev, sizeof(iev)); 304 } 305 } 306 307 void 308 ieee80211_notify_michael_failure(struct ieee80211com *ic, 309 const struct ieee80211_frame *wh, u_int keyix) 310 { 311 struct ifnet *ifp = ic->ic_ifp; 312 313 IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO, 314 "[%s] michael MIC verification failed <keyix %u>\n", 315 ether_sprintf(wh->i_addr2), keyix); 316 ic->ic_stats.is_rx_tkipmic++; 317 318 if (ifp != NULL) { /* NB: for cipher test modules */ 319 struct ieee80211_michael_event iev; 320 321 IEEE80211_ADDR_COPY(iev.iev_dst, wh->i_addr1); 322 IEEE80211_ADDR_COPY(iev.iev_src, wh->i_addr2); 323 iev.iev_cipher = IEEE80211_CIPHER_TKIP; 324 iev.iev_keyix = keyix; 325 rt_ieee80211msg(ifp, RTM_IEEE80211_MICHAEL, &iev, sizeof(iev)); 326 } 327 } 328 329 void 330 ieee80211_load_module(const char *modname) 331 { 332 333 #ifdef notyet 334 (void)kern_kldload(curthread, modname, NULL); 335 #else 336 printf("%s: load the %s module by hand for now.\n", __func__, modname); 337 #endif 338 } 339 340 /* 341 * Module glue. 342 * 343 * NB: the module name is "wlan" for compatibility with NetBSD. 344 */ 345 static int 346 wlan_modevent(module_t mod, int type, void *unused) 347 { 348 switch (type) { 349 case MOD_LOAD: 350 if (bootverbose) 351 printf("wlan: <802.11 Link Layer>\n"); 352 return 0; 353 case MOD_UNLOAD: 354 return 0; 355 } 356 return EINVAL; 357 } 358 359 static moduledata_t wlan_mod = { 360 "wlan", 361 wlan_modevent, 362 0 363 }; 364 DECLARE_MODULE(wlan, wlan_mod, SI_SUB_DRIVERS, SI_ORDER_FIRST); 365 MODULE_VERSION(wlan, 1); 366 MODULE_DEPEND(wlan, ether, 1, 1, 1); 367