ieee80211_superg.c revision 190391
1/*- 2 * Copyright (c) 2002-2009 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 26#include <sys/cdefs.h> 27__FBSDID("$FreeBSD: head/sys/net80211/ieee80211_superg.c 190391 2009-03-24 20:39:08Z sam $"); 28 29#include "opt_wlan.h" 30 31#include <sys/param.h> 32#include <sys/systm.h> 33#include <sys/mbuf.h> 34#include <sys/kernel.h> 35#include <sys/endian.h> 36 37#include <sys/socket.h> 38 39#include <net/bpf.h> 40#include <net/ethernet.h> 41#include <net/if.h> 42#include <net/if_llc.h> 43#include <net/if_media.h> 44 45#include <net80211/ieee80211_var.h> 46#include <net80211/ieee80211_input.h> 47#include <net80211/ieee80211_phy.h> 48#include <net80211/ieee80211_superg.h> 49 50#define ETHER_HEADER_COPY(dst, src) \ 51 memcpy(dst, src, sizeof(struct ether_header)) 52 53void 54ieee80211_superg_attach(struct ieee80211com *ic) 55{ 56} 57 58void 59ieee80211_superg_detach(struct ieee80211com *ic) 60{ 61} 62 63void 64ieee80211_superg_vattach(struct ieee80211vap *vap) 65{ 66 if (vap->iv_caps & IEEE80211_C_FF) 67 vap->iv_flags |= IEEE80211_F_FF; 68 if (vap->iv_caps & IEEE80211_C_TURBOP) 69 vap->iv_flags |= IEEE80211_F_TURBOP; 70} 71 72void 73ieee80211_superg_vdetach(struct ieee80211vap *vap) 74{ 75} 76 77#define ATH_OUI_BYTES 0x00, 0x03, 0x7f 78/* 79 * Add a WME information element to a frame. 80 */ 81uint8_t * 82ieee80211_add_ath(uint8_t *frm, uint8_t caps, uint16_t defkeyix) 83{ 84 static const struct ieee80211_ath_ie info = { 85 .ath_id = IEEE80211_ELEMID_VENDOR, 86 .ath_len = sizeof(struct ieee80211_ath_ie) - 2, 87 .ath_oui = { ATH_OUI_BYTES }, 88 .ath_oui_type = ATH_OUI_TYPE, 89 .ath_oui_subtype= ATH_OUI_SUBTYPE, 90 .ath_version = ATH_OUI_VERSION, 91 }; 92 struct ieee80211_ath_ie *ath = (struct ieee80211_ath_ie *) frm; 93 94 memcpy(frm, &info, sizeof(info)); 95 ath->ath_capability = caps; 96 ath->ath_defkeyix[0] = (defkeyix & 0xff); 97 ath->ath_defkeyix[1] = ((defkeyix >> 8) & 0xff); 98 return frm + sizeof(info); 99} 100#undef ATH_OUI_BYTES 101 102void 103ieee80211_parse_ath(struct ieee80211_node *ni, uint8_t *ie) 104{ 105 const struct ieee80211_ath_ie *ath = 106 (const struct ieee80211_ath_ie *) ie; 107 108 ni->ni_ath_flags = ath->ath_capability; 109 ni->ni_ath_defkeyix = LE_READ_2(&ath->ath_defkeyix); 110} 111 112int 113ieee80211_parse_athparams(struct ieee80211_node *ni, uint8_t *frm, 114 const struct ieee80211_frame *wh) 115{ 116 struct ieee80211vap *vap = ni->ni_vap; 117 const struct ieee80211_ath_ie *ath; 118 u_int len = frm[1]; 119 int capschanged; 120 uint16_t defkeyix; 121 122 if (len < sizeof(struct ieee80211_ath_ie)-2) { 123 IEEE80211_DISCARD_IE(vap, 124 IEEE80211_MSG_ELEMID | IEEE80211_MSG_SUPERG, 125 wh, "Atheros", "too short, len %u", len); 126 return -1; 127 } 128 ath = (const struct ieee80211_ath_ie *)frm; 129 capschanged = (ni->ni_ath_flags != ath->ath_capability); 130 defkeyix = LE_READ_2(ath->ath_defkeyix); 131 if (capschanged || defkeyix != ni->ni_ath_defkeyix) { 132 ni->ni_ath_flags = ath->ath_capability; 133 ni->ni_ath_defkeyix = defkeyix; 134 IEEE80211_NOTE(vap, IEEE80211_MSG_SUPERG, ni, 135 "ath ie change: new caps 0x%x defkeyix 0x%x", 136 ni->ni_ath_flags, ni->ni_ath_defkeyix); 137 } 138 if (IEEE80211_ATH_CAP(vap, ni, ATHEROS_CAP_TURBO_PRIME)) { 139 uint16_t curflags, newflags; 140 141 /* 142 * Check for turbo mode switch. Calculate flags 143 * for the new mode and effect the switch. 144 */ 145 newflags = curflags = vap->iv_ic->ic_bsschan->ic_flags; 146 /* NB: BOOST is not in ic_flags, so get it from the ie */ 147 if (ath->ath_capability & ATHEROS_CAP_BOOST) 148 newflags |= IEEE80211_CHAN_TURBO; 149 else 150 newflags &= ~IEEE80211_CHAN_TURBO; 151 if (newflags != curflags) 152 ieee80211_dturbo_switch(vap, newflags); 153 } 154 return capschanged; 155} 156 157/* 158 * Decap the encapsulated frame pair and dispatch the first 159 * for delivery. The second frame is returned for delivery 160 * via the normal path. 161 */ 162struct mbuf * 163ieee80211_ff_decap(struct ieee80211_node *ni, struct mbuf *m) 164{ 165#define FF_LLC_SIZE (sizeof(struct ether_header) + sizeof(struct llc)) 166#define MS(x,f) (((x) & f) >> f##_S) 167 struct ieee80211vap *vap = ni->ni_vap; 168 struct llc *llc; 169 uint32_t ath; 170 struct mbuf *n; 171 int framelen; 172 173 /* NB: we assume caller does this check for us */ 174 KASSERT(IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_FF), 175 ("ff not negotiated")); 176 /* 177 * Check for fast-frame tunnel encapsulation. 178 */ 179 if (m->m_pkthdr.len < 3*FF_LLC_SIZE) 180 return m; 181 if (m->m_len < FF_LLC_SIZE && 182 (m = m_pullup(m, FF_LLC_SIZE)) == NULL) { 183 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 184 ni->ni_macaddr, "fast-frame", 185 "%s", "m_pullup(llc) failed"); 186 vap->iv_stats.is_rx_tooshort++; 187 return NULL; 188 } 189 llc = (struct llc *)(mtod(m, uint8_t *) + 190 sizeof(struct ether_header)); 191 if (llc->llc_snap.ether_type != htons(ATH_FF_ETH_TYPE)) 192 return m; 193 m_adj(m, FF_LLC_SIZE); 194 m_copydata(m, 0, sizeof(uint32_t), (caddr_t) &ath); 195 if (MS(ath, ATH_FF_PROTO) != ATH_FF_PROTO_L2TUNNEL) { 196 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 197 ni->ni_macaddr, "fast-frame", 198 "unsupport tunnel protocol, header 0x%x", ath); 199 vap->iv_stats.is_ff_badhdr++; 200 m_freem(m); 201 return NULL; 202 } 203 /* NB: skip header and alignment padding */ 204 m_adj(m, roundup(sizeof(uint32_t) - 2, 4) + 2); 205 206 vap->iv_stats.is_ff_decap++; 207 208 /* 209 * Decap the first frame, bust it apart from the 210 * second and deliver; then decap the second frame 211 * and return it to the caller for normal delivery. 212 */ 213 m = ieee80211_decap1(m, &framelen); 214 if (m == NULL) { 215 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 216 ni->ni_macaddr, "fast-frame", "%s", "first decap failed"); 217 vap->iv_stats.is_ff_tooshort++; 218 return NULL; 219 } 220 n = m_split(m, framelen, M_NOWAIT); 221 if (n == NULL) { 222 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 223 ni->ni_macaddr, "fast-frame", 224 "%s", "unable to split encapsulated frames"); 225 vap->iv_stats.is_ff_split++; 226 m_freem(m); /* NB: must reclaim */ 227 return NULL; 228 } 229 /* XXX not right for WDS */ 230 vap->iv_deliver_data(vap, ni, m); /* 1st of pair */ 231 232 /* 233 * Decap second frame. 234 */ 235 m_adj(n, roundup2(framelen, 4) - framelen); /* padding */ 236 n = ieee80211_decap1(n, &framelen); 237 if (n == NULL) { 238 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 239 ni->ni_macaddr, "fast-frame", "%s", "second decap failed"); 240 vap->iv_stats.is_ff_tooshort++; 241 } 242 /* XXX verify framelen against mbuf contents */ 243 return n; /* 2nd delivered by caller */ 244#undef MS 245#undef FF_LLC_SIZE 246} 247 248/* 249 * Do Ethernet-LLC encapsulation for each payload in a fast frame 250 * tunnel encapsulation. The frame is assumed to have an Ethernet 251 * header at the front that must be stripped before prepending the 252 * LLC followed by the Ethernet header passed in (with an Ethernet 253 * type that specifies the payload size). 254 */ 255static struct mbuf * 256ff_encap1(struct ieee80211vap *vap, struct mbuf *m, 257 const struct ether_header *eh) 258{ 259 struct llc *llc; 260 uint16_t payload; 261 262 /* XXX optimize by combining m_adj+M_PREPEND */ 263 m_adj(m, sizeof(struct ether_header) - sizeof(struct llc)); 264 llc = mtod(m, struct llc *); 265 llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP; 266 llc->llc_control = LLC_UI; 267 llc->llc_snap.org_code[0] = 0; 268 llc->llc_snap.org_code[1] = 0; 269 llc->llc_snap.org_code[2] = 0; 270 llc->llc_snap.ether_type = eh->ether_type; 271 payload = m->m_pkthdr.len; /* NB: w/o Ethernet header */ 272 273 M_PREPEND(m, sizeof(struct ether_header), M_DONTWAIT); 274 if (m == NULL) { /* XXX cannot happen */ 275 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG, 276 "%s: no space for ether_header\n", __func__); 277 vap->iv_stats.is_tx_nobuf++; 278 return NULL; 279 } 280 ETHER_HEADER_COPY(mtod(m, void *), eh); 281 mtod(m, struct ether_header *)->ether_type = htons(payload); 282 return m; 283} 284 285/* 286 * Fast frame encapsulation. There must be two packets 287 * chained with m_nextpkt. We do header adjustment for 288 * each, add the tunnel encapsulation, and then concatenate 289 * the mbuf chains to form a single frame for transmission. 290 */ 291struct mbuf * 292ieee80211_ff_encap(struct ieee80211vap *vap, struct mbuf *m1, int hdrspace, 293 struct ieee80211_key *key) 294{ 295 struct mbuf *m2; 296 struct ether_header eh1, eh2; 297 struct llc *llc; 298 struct mbuf *m; 299 int pad; 300 301 m2 = m1->m_nextpkt; 302 if (m2 == NULL) { 303 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG, 304 "%s: only one frame\n", __func__); 305 goto bad; 306 } 307 m1->m_nextpkt = NULL; 308 /* 309 * Include fast frame headers in adjusting header 310 * layout; this allocates space according to what 311 * ff_encap will do. 312 */ 313 m1 = ieee80211_mbuf_adjust(vap, 314 hdrspace + sizeof(struct llc) + sizeof(uint32_t) + 2 + 315 sizeof(struct ether_header), 316 key, m1); 317 if (m1 == NULL) { 318 /* NB: ieee80211_mbuf_adjust handles msgs+statistics */ 319 m_freem(m2); 320 goto bad; 321 } 322 323 /* 324 * Copy second frame's Ethernet header out of line 325 * and adjust for encapsulation headers. Note that 326 * we make room for padding in case there isn't room 327 * at the end of first frame. 328 */ 329 KASSERT(m2->m_len >= sizeof(eh2), ("no ethernet header!")); 330 ETHER_HEADER_COPY(&eh2, mtod(m2, caddr_t)); 331 m2 = ieee80211_mbuf_adjust(vap, 332 ATH_FF_MAX_HDR_PAD + sizeof(struct ether_header), 333 NULL, m2); 334 if (m2 == NULL) { 335 /* NB: ieee80211_mbuf_adjust handles msgs+statistics */ 336 goto bad; 337 } 338 339 /* 340 * Now do tunnel encapsulation. First, each 341 * frame gets a standard encapsulation. 342 */ 343 m1 = ff_encap1(vap, m1, &eh1); 344 if (m1 == NULL) 345 goto bad; 346 m2 = ff_encap1(vap, m2, &eh2); 347 if (m2 == NULL) 348 goto bad; 349 350 /* 351 * Pad leading frame to a 4-byte boundary. If there 352 * is space at the end of the first frame, put it 353 * there; otherwise prepend to the front of the second 354 * frame. We know doing the second will always work 355 * because we reserve space above. We prefer appending 356 * as this typically has better DMA alignment properties. 357 */ 358 for (m = m1; m->m_next != NULL; m = m->m_next) 359 ; 360 pad = roundup2(m1->m_pkthdr.len, 4) - m1->m_pkthdr.len; 361 if (pad) { 362 if (M_TRAILINGSPACE(m) < pad) { /* prepend to second */ 363 m2->m_data -= pad; 364 m2->m_len += pad; 365 m2->m_pkthdr.len += pad; 366 } else { /* append to first */ 367 m->m_len += pad; 368 m1->m_pkthdr.len += pad; 369 } 370 } 371 372 /* 373 * Now, stick 'em together and prepend the tunnel headers; 374 * first the Atheros tunnel header (all zero for now) and 375 * then a special fast frame LLC. 376 * 377 * XXX optimize by prepending together 378 */ 379 m->m_next = m2; /* NB: last mbuf from above */ 380 m1->m_pkthdr.len += m2->m_pkthdr.len; 381 M_PREPEND(m1, sizeof(uint32_t)+2, M_DONTWAIT); 382 if (m1 == NULL) { /* XXX cannot happen */ 383 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG, 384 "%s: no space for tunnel header\n", __func__); 385 vap->iv_stats.is_tx_nobuf++; 386 return NULL; 387 } 388 memset(mtod(m1, void *), 0, sizeof(uint32_t)+2); 389 390 M_PREPEND(m1, sizeof(struct llc), M_DONTWAIT); 391 if (m1 == NULL) { /* XXX cannot happen */ 392 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG, 393 "%s: no space for llc header\n", __func__); 394 vap->iv_stats.is_tx_nobuf++; 395 return NULL; 396 } 397 llc = mtod(m1, struct llc *); 398 llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP; 399 llc->llc_control = LLC_UI; 400 llc->llc_snap.org_code[0] = ATH_FF_SNAP_ORGCODE_0; 401 llc->llc_snap.org_code[1] = ATH_FF_SNAP_ORGCODE_1; 402 llc->llc_snap.org_code[2] = ATH_FF_SNAP_ORGCODE_2; 403 llc->llc_snap.ether_type = htons(ATH_FF_ETH_TYPE); 404 405 vap->iv_stats.is_ff_encap++; 406 407 return m1; 408bad: 409 if (m1 != NULL) 410 m_freem(m1); 411 if (m2 != NULL) 412 m_freem(m2); 413 return NULL; 414} 415 416/* 417 * Switch between turbo and non-turbo operating modes. 418 * Use the specified channel flags to locate the new 419 * channel, update 802.11 state, and then call back into 420 * the driver to effect the change. 421 */ 422void 423ieee80211_dturbo_switch(struct ieee80211vap *vap, int newflags) 424{ 425 struct ieee80211com *ic = vap->iv_ic; 426 struct ieee80211_channel *chan; 427 428 chan = ieee80211_find_channel(ic, ic->ic_bsschan->ic_freq, newflags); 429 if (chan == NULL) { /* XXX should not happen */ 430 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG, 431 "%s: no channel with freq %u flags 0x%x\n", 432 __func__, ic->ic_bsschan->ic_freq, newflags); 433 return; 434 } 435 436 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG, 437 "%s: %s -> %s (freq %u flags 0x%x)\n", __func__, 438 ieee80211_phymode_name[ieee80211_chan2mode(ic->ic_bsschan)], 439 ieee80211_phymode_name[ieee80211_chan2mode(chan)], 440 chan->ic_freq, chan->ic_flags); 441 442 ic->ic_bsschan = chan; 443 ic->ic_prevchan = ic->ic_curchan; 444 ic->ic_curchan = chan; 445 ic->ic_set_channel(ic); 446 /* NB: do not need to reset ERP state 'cuz we're in sta mode */ 447} 448 449/* 450 * Return the current ``state'' of an Atheros capbility. 451 * If associated in station mode report the negotiated 452 * setting. Otherwise report the current setting. 453 */ 454static int 455getathcap(struct ieee80211vap *vap, int cap) 456{ 457 if (vap->iv_opmode == IEEE80211_M_STA && 458 vap->iv_state == IEEE80211_S_RUN) 459 return IEEE80211_ATH_CAP(vap, vap->iv_bss, cap) != 0; 460 else 461 return (vap->iv_flags & cap) != 0; 462} 463 464static int 465superg_ioctl_get80211(struct ieee80211vap *vap, struct ieee80211req *ireq) 466{ 467 switch (ireq->i_type) { 468 case IEEE80211_IOC_FF: 469 ireq->i_val = getathcap(vap, IEEE80211_F_FF); 470 break; 471 case IEEE80211_IOC_TURBOP: 472 ireq->i_val = getathcap(vap, IEEE80211_F_TURBOP); 473 break; 474 default: 475 return ENOSYS; 476 } 477 return 0; 478} 479IEEE80211_IOCTL_GET(superg, superg_ioctl_get80211); 480 481static int 482superg_ioctl_set80211(struct ieee80211vap *vap, struct ieee80211req *ireq) 483{ 484 switch (ireq->i_type) { 485 case IEEE80211_IOC_FF: 486 if (ireq->i_val) { 487 if ((vap->iv_caps & IEEE80211_C_FF) == 0) 488 return EOPNOTSUPP; 489 vap->iv_flags |= IEEE80211_F_FF; 490 } else 491 vap->iv_flags &= ~IEEE80211_F_FF; 492 return ERESTART; 493 case IEEE80211_IOC_TURBOP: 494 if (ireq->i_val) { 495 if ((vap->iv_caps & IEEE80211_C_TURBOP) == 0) 496 return EOPNOTSUPP; 497 vap->iv_flags |= IEEE80211_F_TURBOP; 498 } else 499 vap->iv_flags &= ~IEEE80211_F_TURBOP; 500 return ENETRESET; 501 default: 502 return ENOSYS; 503 } 504 return 0; 505} 506IEEE80211_IOCTL_SET(superg, superg_ioctl_set80211); 507