ieee80211_freebsd.c revision 170360
155682Smarkm/*- 255682Smarkm * Copyright (c) 2003-2007 Sam Leffler, Errno Consulting 355682Smarkm * All rights reserved. 455682Smarkm * 555682Smarkm * Redistribution and use in source and binary forms, with or without 655682Smarkm * modification, are permitted provided that the following conditions 755682Smarkm * are met: 855682Smarkm * 1. Redistributions of source code must retain the above copyright 955682Smarkm * notice, this list of conditions and the following disclaimer. 1055682Smarkm * 2. Redistributions in binary form must reproduce the above copyright 1155682Smarkm * notice, this list of conditions and the following disclaimer in the 1255682Smarkm * documentation and/or other materials provided with the distribution. 1355682Smarkm * 1455682Smarkm * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 1555682Smarkm * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 1655682Smarkm * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 1755682Smarkm * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 1855682Smarkm * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 1955682Smarkm * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 2055682Smarkm * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 2155682Smarkm * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 2255682Smarkm * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 2355682Smarkm * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 2455682Smarkm */ 2555682Smarkm 2655682Smarkm#include <sys/cdefs.h> 2755682Smarkm__FBSDID("$FreeBSD: head/sys/net80211/ieee80211_freebsd.c 170360 2007-06-06 04:56:04Z sam $"); 2855682Smarkm 2955682Smarkm/* 3055682Smarkm * IEEE 802.11 support (FreeBSD-specific code) 3155682Smarkm */ 3255682Smarkm#include <sys/param.h> 3355682Smarkm#include <sys/kernel.h> 3455682Smarkm#include <sys/systm.h> 3555682Smarkm#include <sys/linker.h> 3657416Smarkm#include <sys/mbuf.h> 3755682Smarkm#include <sys/module.h> 3857416Smarkm#include <sys/proc.h> 3957416Smarkm#include <sys/sysctl.h> 4055682Smarkm 4155682Smarkm#include <sys/socket.h> 4255682Smarkm 4355682Smarkm#include <net/if.h> 4455682Smarkm#include <net/if_media.h> 4555682Smarkm#include <net/ethernet.h> 4655682Smarkm#include <net/route.h> 4755682Smarkm 4855682Smarkm#include <net80211/ieee80211_var.h> 4955682Smarkm 5055682SmarkmSYSCTL_NODE(_net, OID_AUTO, wlan, CTLFLAG_RD, 0, "IEEE 80211 parameters"); 5155682Smarkm 5255682Smarkm#ifdef IEEE80211_DEBUG 5355682Smarkmint ieee80211_debug = 0; 5455682SmarkmSYSCTL_INT(_net_wlan, OID_AUTO, debug, CTLFLAG_RW, &ieee80211_debug, 5555682Smarkm 0, "debugging printfs"); 5655682Smarkm#endif 5755682Smarkm 5855682Smarkmstatic int 5955682Smarkmieee80211_sysctl_inact(SYSCTL_HANDLER_ARGS) 6055682Smarkm{ 6155682Smarkm int inact = (*(int *)arg1) * IEEE80211_INACT_WAIT; 6255682Smarkm int error; 6355682Smarkm 6455682Smarkm error = sysctl_handle_int(oidp, &inact, 0, req); 6555682Smarkm if (error || !req->newptr) 6655682Smarkm return error; 6755682Smarkm *(int *)arg1 = inact / IEEE80211_INACT_WAIT; 6855682Smarkm return 0; 6955682Smarkm} 7055682Smarkm 7155682Smarkmstatic int 7255682Smarkmieee80211_sysctl_parent(SYSCTL_HANDLER_ARGS) 7355682Smarkm{ 7455682Smarkm struct ieee80211com *ic = arg1; 7555682Smarkm const char *name = ic->ic_ifp->if_xname; 7655682Smarkm 7755682Smarkm return SYSCTL_OUT(req, name, strlen(name)); 7855682Smarkm} 7955682Smarkm 8055682Smarkmvoid 8155682Smarkmieee80211_sysctl_attach(struct ieee80211com *ic) 8255682Smarkm{ 8355682Smarkm struct sysctl_ctx_list *ctx; 8455682Smarkm struct sysctl_oid *oid; 8555682Smarkm char num[14]; /* sufficient for 32 bits */ 8655682Smarkm 8755682Smarkm MALLOC(ctx, struct sysctl_ctx_list *, sizeof(struct sysctl_ctx_list), 8855682Smarkm M_DEVBUF, M_NOWAIT | M_ZERO); 8955682Smarkm if (ctx == NULL) { 9055682Smarkm if_printf(ic->ic_ifp, "%s: cannot allocate sysctl context!\n", 9155682Smarkm __func__); 9255682Smarkm return; 9355682Smarkm } 9455682Smarkm sysctl_ctx_init(ctx); 9555682Smarkm snprintf(num, sizeof(num), "%u", ic->ic_vap); 9655682Smarkm oid = SYSCTL_ADD_NODE(ctx, &SYSCTL_NODE_CHILDREN(_net, wlan), 9755682Smarkm OID_AUTO, num, CTLFLAG_RD, NULL, ""); 9855682Smarkm SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(oid), OID_AUTO, 9955682Smarkm "%parent", CTLFLAG_RD, ic, 0, ieee80211_sysctl_parent, "A", 10055682Smarkm "parent device"); 10155682Smarkm#ifdef IEEE80211_DEBUG 10255682Smarkm ic->ic_debug = ieee80211_debug; 10355682Smarkm SYSCTL_ADD_INT(ctx, SYSCTL_CHILDREN(oid), OID_AUTO, 10455682Smarkm "debug", CTLFLAG_RW, &ic->ic_debug, 0, 10555682Smarkm "control debugging printfs"); 10655682Smarkm#endif 10755682Smarkm /* XXX inherit from tunables */ 10855682Smarkm SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(oid), OID_AUTO, 10955682Smarkm "inact_run", CTLTYPE_INT | CTLFLAG_RW, &ic->ic_inact_run, 0, 11055682Smarkm ieee80211_sysctl_inact, "I", 11155682Smarkm "station inactivity timeout (sec)"); 11255682Smarkm SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(oid), OID_AUTO, 11355682Smarkm "inact_probe", CTLTYPE_INT | CTLFLAG_RW, &ic->ic_inact_probe, 0, 11455682Smarkm ieee80211_sysctl_inact, "I", 11555682Smarkm "station inactivity probe timeout (sec)"); 11655682Smarkm SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(oid), OID_AUTO, 11755682Smarkm "inact_auth", CTLTYPE_INT | CTLFLAG_RW, &ic->ic_inact_auth, 0, 11855682Smarkm ieee80211_sysctl_inact, "I", 11955682Smarkm "station authentication timeout (sec)"); 12055682Smarkm SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(oid), OID_AUTO, 12155682Smarkm "inact_init", CTLTYPE_INT | CTLFLAG_RW, &ic->ic_inact_init, 0, 12255682Smarkm ieee80211_sysctl_inact, "I", 12355682Smarkm "station initial state timeout (sec)"); 12455682Smarkm SYSCTL_ADD_INT(ctx, SYSCTL_CHILDREN(oid), OID_AUTO, 12555682Smarkm "driver_caps", CTLFLAG_RW, &ic->ic_caps, 0, 12655682Smarkm "driver capabilities"); 12755682Smarkm SYSCTL_ADD_INT(ctx, SYSCTL_CHILDREN(oid), OID_AUTO, 12855682Smarkm "bmiss_max", CTLFLAG_RW, &ic->ic_bmiss_max, 0, 12955682Smarkm "consecutive beacon misses before scanning"); 13055682Smarkm ic->ic_sysctl = ctx; 13155682Smarkm} 13255682Smarkm 13355682Smarkmvoid 13455682Smarkmieee80211_sysctl_detach(struct ieee80211com *ic) 13555682Smarkm{ 13655682Smarkm 13755682Smarkm if (ic->ic_sysctl != NULL) { 13855682Smarkm sysctl_ctx_free(ic->ic_sysctl); 13955682Smarkm ic->ic_sysctl = NULL; 14055682Smarkm } 14155682Smarkm} 14255682Smarkm 14355682Smarkmint 14455682Smarkmieee80211_node_dectestref(struct ieee80211_node *ni) 14555682Smarkm{ 14655682Smarkm /* XXX need equivalent of atomic_dec_and_test */ 14755682Smarkm atomic_subtract_int(&ni->ni_refcnt, 1); 14855682Smarkm return atomic_cmpset_int(&ni->ni_refcnt, 0, 1); 14955682Smarkm} 15055682Smarkm 15155682Smarkmvoid 15255682Smarkmieee80211_drain_ifq(struct ifqueue *ifq) 15355682Smarkm{ 15455682Smarkm struct ieee80211_node *ni; 15555682Smarkm struct mbuf *m; 156 157 for (;;) { 158 IF_DEQUEUE(ifq, m); 159 if (m == NULL) 160 break; 161 162 ni = (struct ieee80211_node *)m->m_pkthdr.rcvif; 163 KASSERT(ni != NULL, ("frame w/o node")); 164 ieee80211_free_node(ni); 165 m->m_pkthdr.rcvif = NULL; 166 167 m_freem(m); 168 } 169} 170 171/* 172 * Allocate and setup a management frame of the specified 173 * size. We return the mbuf and a pointer to the start 174 * of the contiguous data area that's been reserved based 175 * on the packet length. The data area is forced to 32-bit 176 * alignment and the buffer length to a multiple of 4 bytes. 177 * This is done mainly so beacon frames (that require this) 178 * can use this interface too. 179 */ 180struct mbuf * 181ieee80211_getmgtframe(u_int8_t **frm, u_int pktlen) 182{ 183 struct mbuf *m; 184 u_int len; 185 186 /* 187 * NB: we know the mbuf routines will align the data area 188 * so we don't need to do anything special. 189 */ 190 /* XXX 4-address frame? */ 191 len = roundup(sizeof(struct ieee80211_frame) + pktlen, 4); 192 KASSERT(len <= MCLBYTES, ("802.11 mgt frame too large: %u", len)); 193 if (len < MINCLSIZE) { 194 m = m_gethdr(M_NOWAIT, MT_DATA); 195 /* 196 * Align the data in case additional headers are added. 197 * This should only happen when a WEP header is added 198 * which only happens for shared key authentication mgt 199 * frames which all fit in MHLEN. 200 */ 201 if (m != NULL) 202 MH_ALIGN(m, len); 203 } else 204 m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR); 205 if (m != NULL) { 206 m->m_data += sizeof(struct ieee80211_frame); 207 *frm = m->m_data; 208 } 209 return m; 210} 211 212#include <sys/libkern.h> 213 214void 215get_random_bytes(void *p, size_t n) 216{ 217 u_int8_t *dp = p; 218 219 while (n > 0) { 220 u_int32_t v = arc4random(); 221 size_t nb = n > sizeof(u_int32_t) ? sizeof(u_int32_t) : n; 222 bcopy(&v, dp, n > sizeof(u_int32_t) ? sizeof(u_int32_t) : n); 223 dp += sizeof(u_int32_t), n -= nb; 224 } 225} 226 227void 228ieee80211_notify_node_join(struct ieee80211com *ic, struct ieee80211_node *ni, int newassoc) 229{ 230 struct ifnet *ifp = ic->ic_ifp; 231 struct ieee80211_join_event iev; 232 233 memset(&iev, 0, sizeof(iev)); 234 if (ni == ic->ic_bss) { 235 IEEE80211_ADDR_COPY(iev.iev_addr, ni->ni_bssid); 236 rt_ieee80211msg(ifp, newassoc ? 237 RTM_IEEE80211_ASSOC : RTM_IEEE80211_REASSOC, 238 &iev, sizeof(iev)); 239 if_link_state_change(ifp, LINK_STATE_UP); 240 } else { 241 IEEE80211_ADDR_COPY(iev.iev_addr, ni->ni_macaddr); 242 rt_ieee80211msg(ifp, newassoc ? 243 RTM_IEEE80211_JOIN : RTM_IEEE80211_REJOIN, 244 &iev, sizeof(iev)); 245 } 246} 247 248void 249ieee80211_notify_node_leave(struct ieee80211com *ic, struct ieee80211_node *ni) 250{ 251 struct ifnet *ifp = ic->ic_ifp; 252 struct ieee80211_leave_event iev; 253 254 if (ni == ic->ic_bss) { 255 rt_ieee80211msg(ifp, RTM_IEEE80211_DISASSOC, NULL, 0); 256 if_link_state_change(ifp, LINK_STATE_DOWN); 257 } else { 258 /* fire off wireless event station leaving */ 259 memset(&iev, 0, sizeof(iev)); 260 IEEE80211_ADDR_COPY(iev.iev_addr, ni->ni_macaddr); 261 rt_ieee80211msg(ifp, RTM_IEEE80211_LEAVE, &iev, sizeof(iev)); 262 } 263} 264 265void 266ieee80211_notify_scan_done(struct ieee80211com *ic) 267{ 268 struct ifnet *ifp = ic->ic_ifp; 269 270 IEEE80211_DPRINTF(ic, IEEE80211_MSG_SCAN, "%s\n", "notify scan done"); 271 272 /* dispatch wireless event indicating scan completed */ 273 rt_ieee80211msg(ifp, RTM_IEEE80211_SCAN, NULL, 0); 274} 275 276void 277ieee80211_notify_replay_failure(struct ieee80211com *ic, 278 const struct ieee80211_frame *wh, const struct ieee80211_key *k, 279 u_int64_t rsc) 280{ 281 struct ifnet *ifp = ic->ic_ifp; 282 283 IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO, 284 "[%s] %s replay detected <rsc %ju, csc %ju, keyix %u rxkeyix %u>\n", 285 ether_sprintf(wh->i_addr2), k->wk_cipher->ic_name, 286 (intmax_t) rsc, (intmax_t) k->wk_keyrsc, 287 k->wk_keyix, k->wk_rxkeyix); 288 289 if (ifp != NULL) { /* NB: for cipher test modules */ 290 struct ieee80211_replay_event iev; 291 292 IEEE80211_ADDR_COPY(iev.iev_dst, wh->i_addr1); 293 IEEE80211_ADDR_COPY(iev.iev_src, wh->i_addr2); 294 iev.iev_cipher = k->wk_cipher->ic_cipher; 295 if (k->wk_rxkeyix != IEEE80211_KEYIX_NONE) 296 iev.iev_keyix = k->wk_rxkeyix; 297 else 298 iev.iev_keyix = k->wk_keyix; 299 iev.iev_keyrsc = k->wk_keyrsc; 300 iev.iev_rsc = rsc; 301 rt_ieee80211msg(ifp, RTM_IEEE80211_REPLAY, &iev, sizeof(iev)); 302 } 303} 304 305void 306ieee80211_notify_michael_failure(struct ieee80211com *ic, 307 const struct ieee80211_frame *wh, u_int keyix) 308{ 309 struct ifnet *ifp = ic->ic_ifp; 310 311 IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO, 312 "[%s] michael MIC verification failed <keyix %u>\n", 313 ether_sprintf(wh->i_addr2), keyix); 314 ic->ic_stats.is_rx_tkipmic++; 315 316 if (ifp != NULL) { /* NB: for cipher test modules */ 317 struct ieee80211_michael_event iev; 318 319 IEEE80211_ADDR_COPY(iev.iev_dst, wh->i_addr1); 320 IEEE80211_ADDR_COPY(iev.iev_src, wh->i_addr2); 321 iev.iev_cipher = IEEE80211_CIPHER_TKIP; 322 iev.iev_keyix = keyix; 323 rt_ieee80211msg(ifp, RTM_IEEE80211_MICHAEL, &iev, sizeof(iev)); 324 } 325} 326 327void 328ieee80211_load_module(const char *modname) 329{ 330 331#ifdef notyet 332 (void)kern_kldload(curthread, modname, NULL); 333#else 334 printf("%s: load the %s module by hand for now.\n", __func__, modname); 335#endif 336} 337 338/* 339 * Module glue. 340 * 341 * NB: the module name is "wlan" for compatibility with NetBSD. 342 */ 343static int 344wlan_modevent(module_t mod, int type, void *unused) 345{ 346 switch (type) { 347 case MOD_LOAD: 348 if (bootverbose) 349 printf("wlan: <802.11 Link Layer>\n"); 350 return 0; 351 case MOD_UNLOAD: 352 return 0; 353 } 354 return EINVAL; 355} 356 357static moduledata_t wlan_mod = { 358 "wlan", 359 wlan_modevent, 360 0 361}; 362DECLARE_MODULE(wlan, wlan_mod, SI_SUB_DRIVERS, SI_ORDER_FIRST); 363MODULE_VERSION(wlan, 1); 364MODULE_DEPEND(wlan, ether, 1, 1, 1); 365