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 ic->ic_sysctl = ctx; 130 } 131 132 void 133 ieee80211_sysctl_detach(struct ieee80211com *ic) 134 { 135 136 if (ic->ic_sysctl != NULL) { 137 sysctl_ctx_free(ic->ic_sysctl); 138 ic->ic_sysctl = NULL; 139 } 140 } 141 142 int 143 ieee80211_node_dectestref(struct ieee80211_node *ni) 144 { 145 /* XXX need equivalent of atomic_dec_and_test */ 146 atomic_subtract_int(&ni->ni_refcnt, 1); 147 return atomic_cmpset_int(&ni->ni_refcnt, 0, 1); 148 } 149 150 /* 151 * Allocate and setup a management frame of the specified 152 * size. We return the mbuf and a pointer to the start 153 * of the contiguous data area that's been reserved based 154 * on the packet length. The data area is forced to 32-bit 155 * alignment and the buffer length to a multiple of 4 bytes. 156 * This is done mainly so beacon frames (that require this) 157 * can use this interface too. 158 */ 159 struct mbuf * 160 ieee80211_getmgtframe(u_int8_t **frm, u_int pktlen) 161 { 162 struct mbuf *m; 163 u_int len; 164 165 /* 166 * NB: we know the mbuf routines will align the data area 167 * so we don't need to do anything special. 168 */ 169 /* XXX 4-address frame? */ 170 len = roundup(sizeof(struct ieee80211_frame) + pktlen, 4); 171 KASSERT(len <= MCLBYTES, ("802.11 mgt frame too large: %u", len)); 172 if (len < MINCLSIZE) { 173 m = m_gethdr(M_NOWAIT, MT_HEADER); 174 /* 175 * Align the data in case additional headers are added. 176 * This should only happen when a WEP header is added 177 * which only happens for shared key authentication mgt 178 * frames which all fit in MHLEN. 179 */ 180 if (m != NULL) 181 MH_ALIGN(m, len); 182 } else 183 m = m_getcl(M_NOWAIT, MT_HEADER, M_PKTHDR); 184 if (m != NULL) { 185 m->m_data += sizeof(struct ieee80211_frame); 186 *frm = m->m_data; 187 } 188 return m; 189 } 190 191 #include <sys/libkern.h> 192 193 void 194 get_random_bytes(void *p, size_t n) 195 { 196 u_int8_t *dp = p; 197 198 while (n > 0) { 199 u_int32_t v = arc4random(); 200 size_t nb = n > sizeof(u_int32_t) ? sizeof(u_int32_t) : n; 201 bcopy(&v, dp, n > sizeof(u_int32_t) ? sizeof(u_int32_t) : n); 202 dp += sizeof(u_int32_t), n -= nb; 203 } 204 } 205 206 void 207 ieee80211_notify_node_join(struct ieee80211com *ic, struct ieee80211_node *ni, int newassoc) 208 { 209 struct ifnet *ifp = ic->ic_ifp; 210 struct ieee80211_join_event iev; 211 212 if (ni == ic->ic_bss) { 213 memset(&iev, 0, sizeof(iev)); 214 IEEE80211_ADDR_COPY(iev.iev_addr, ni->ni_bssid); 215 rt_ieee80211msg(ifp, newassoc ? 216 RTM_IEEE80211_ASSOC : RTM_IEEE80211_REASSOC, 217 &iev, sizeof(iev)); 218 if_link_state_change(ifp, LINK_STATE_UP); 219 } else if (newassoc) { 220 /* fire off wireless event only for new station */ 221 memset(&iev, 0, sizeof(iev)); 222 IEEE80211_ADDR_COPY(iev.iev_addr, ni->ni_macaddr); 223 rt_ieee80211msg(ifp, RTM_IEEE80211_JOIN, &iev, sizeof(iev)); 224 } 225 } 226 227 void 228 ieee80211_notify_node_leave(struct ieee80211com *ic, struct ieee80211_node *ni) 229 { 230 struct ifnet *ifp = ic->ic_ifp; 231 struct ieee80211_leave_event iev; 232 233 if (ni == ic->ic_bss) { 234 rt_ieee80211msg(ifp, RTM_IEEE80211_DISASSOC, NULL, 0); 235 if_link_state_change(ifp, LINK_STATE_DOWN); 236 } else { 237 /* fire off wireless event station leaving */ 238 memset(&iev, 0, sizeof(iev)); 239 IEEE80211_ADDR_COPY(iev.iev_addr, ni->ni_macaddr); 240 rt_ieee80211msg(ifp, RTM_IEEE80211_LEAVE, &iev, sizeof(iev)); 241 } 242 } 243 244 void 245 ieee80211_notify_scan_done(struct ieee80211com *ic) 246 { 247 struct ifnet *ifp = ic->ic_ifp; 248 249 IEEE80211_DPRINTF(ic, IEEE80211_MSG_SCAN, 250 "%s: notify scan done\n", ic->ic_ifp->if_xname); 251 252 /* dispatch wireless event indicating scan completed */ 253 rt_ieee80211msg(ifp, RTM_IEEE80211_SCAN, NULL, 0); 254 } 255 256 void 257 ieee80211_notify_replay_failure(struct ieee80211com *ic, 258 const struct ieee80211_frame *wh, const struct ieee80211_key *k, 259 u_int64_t rsc) 260 { 261 struct ifnet *ifp = ic->ic_ifp; 262 263 IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO, 264 "[%s] %s replay detected <rsc %ju, csc %ju, keyix %u>\n", 265 ether_sprintf(wh->i_addr2), k->wk_cipher->ic_name, 266 (intmax_t) rsc, (intmax_t) k->wk_keyrsc, k->wk_keyix); 267 268 if (ifp != NULL) { /* NB: for cipher test modules */ 269 struct ieee80211_replay_event iev; 270 271 IEEE80211_ADDR_COPY(iev.iev_dst, wh->i_addr1); 272 IEEE80211_ADDR_COPY(iev.iev_src, wh->i_addr2); 273 iev.iev_cipher = k->wk_cipher->ic_cipher; 274 iev.iev_keyix = k->wk_keyix; 275 iev.iev_keyrsc = k->wk_keyrsc; 276 iev.iev_rsc = rsc; 277 rt_ieee80211msg(ifp, RTM_IEEE80211_REPLAY, &iev, sizeof(iev)); 278 } 279 } 280 281 void 282 ieee80211_notify_michael_failure(struct ieee80211com *ic, 283 const struct ieee80211_frame *wh, u_int keyix) 284 { 285 struct ifnet *ifp = ic->ic_ifp; 286 287 IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO, 288 "[%s] michael MIC verification failed <keyix %u>\n", 289 ether_sprintf(wh->i_addr2), keyix); 290 ic->ic_stats.is_rx_tkipmic++; 291 292 if (ifp != NULL) { /* NB: for cipher test modules */ 293 struct ieee80211_michael_event iev; 294 295 IEEE80211_ADDR_COPY(iev.iev_dst, wh->i_addr1); 296 IEEE80211_ADDR_COPY(iev.iev_src, wh->i_addr2); 297 iev.iev_cipher = IEEE80211_CIPHER_TKIP; 298 iev.iev_keyix = keyix; 299 rt_ieee80211msg(ifp, RTM_IEEE80211_MICHAEL, &iev, sizeof(iev)); 300 } 301 } 302 303 void 304 ieee80211_load_module(const char *modname) 305 { 306 #ifdef notyet 307 struct thread *td = curthread; 308 309 if (suser(td) == 0 && securelevel_gt(td->td_ucred, 0) == 0) { 310 mtx_lock(&Giant); 311 (void) linker_load_module(modname, NULL, NULL, NULL, NULL); 312 mtx_unlock(&Giant); 313 } 314 #else 315 printf("%s: load the %s module by hand for now.\n", __func__, modname); 316 #endif 317 } 318 319 /* 320 * Module glue. 321 * 322 * NB: the module name is "wlan" for compatibility with NetBSD. 323 */ 324 static int 325 wlan_modevent(module_t mod, int type, void *unused) 326 { 327 switch (type) { 328 case MOD_LOAD: 329 if (bootverbose) 330 printf("wlan: <802.11 Link Layer>\n"); 331 return 0; 332 case MOD_UNLOAD: 333 return 0; 334 } 335 return EINVAL; 336 } 337 338 static moduledata_t wlan_mod = { 339 "wlan", 340 wlan_modevent, 341 0 342 }; 343 DECLARE_MODULE(wlan, wlan_mod, SI_SUB_DRIVERS, SI_ORDER_FIRST); 344 MODULE_VERSION(wlan, 1); 345 MODULE_DEPEND(wlan, ether, 1, 1, 1); 346