Greg Kroah-Hartman | 00b3ed1 | 2008-10-02 11:29:28 -0700 | [diff] [blame] | 1 | /* src/p80211/p80211conv.c |
| 2 | * |
| 3 | * Ether/802.11 conversions and packet buffer routines |
| 4 | * |
| 5 | * Copyright (C) 1999 AbsoluteValue Systems, Inc. All Rights Reserved. |
| 6 | * -------------------------------------------------------------------- |
| 7 | * |
| 8 | * linux-wlan |
| 9 | * |
| 10 | * The contents of this file are subject to the Mozilla Public |
| 11 | * License Version 1.1 (the "License"); you may not use this file |
| 12 | * except in compliance with the License. You may obtain a copy of |
| 13 | * the License at http://www.mozilla.org/MPL/ |
| 14 | * |
| 15 | * Software distributed under the License is distributed on an "AS |
| 16 | * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or |
| 17 | * implied. See the License for the specific language governing |
| 18 | * rights and limitations under the License. |
| 19 | * |
| 20 | * Alternatively, the contents of this file may be used under the |
| 21 | * terms of the GNU Public License version 2 (the "GPL"), in which |
| 22 | * case the provisions of the GPL are applicable instead of the |
| 23 | * above. If you wish to allow the use of your version of this file |
| 24 | * only under the terms of the GPL and not to allow others to use |
| 25 | * your version of this file under the MPL, indicate your decision |
| 26 | * by deleting the provisions above and replace them with the notice |
| 27 | * and other provisions required by the GPL. If you do not delete |
| 28 | * the provisions above, a recipient may use your version of this |
| 29 | * file under either the MPL or the GPL. |
| 30 | * |
| 31 | * -------------------------------------------------------------------- |
| 32 | * |
| 33 | * Inquiries regarding the linux-wlan Open Source project can be |
| 34 | * made directly to: |
| 35 | * |
| 36 | * AbsoluteValue Systems Inc. |
| 37 | * info@linux-wlan.com |
| 38 | * http://www.linux-wlan.com |
| 39 | * |
| 40 | * -------------------------------------------------------------------- |
| 41 | * |
| 42 | * Portions of the development of this software were funded by |
| 43 | * Intersil Corporation as part of PRISM(R) chipset product development. |
| 44 | * |
| 45 | * -------------------------------------------------------------------- |
| 46 | * |
| 47 | * This file defines the functions that perform Ethernet to/from |
| 48 | * 802.11 frame conversions. |
| 49 | * |
| 50 | * -------------------------------------------------------------------- |
| 51 | */ |
| 52 | /*================================================================*/ |
| 53 | /* System Includes */ |
| 54 | |
Greg Kroah-Hartman | 00b3ed1 | 2008-10-02 11:29:28 -0700 | [diff] [blame] | 55 | #include <linux/version.h> |
| 56 | |
| 57 | #include <linux/module.h> |
| 58 | #include <linux/kernel.h> |
| 59 | #include <linux/sched.h> |
| 60 | #include <linux/types.h> |
| 61 | #include <linux/skbuff.h> |
| 62 | #include <linux/slab.h> |
| 63 | #include <linux/wireless.h> |
| 64 | #include <linux/netdevice.h> |
| 65 | #include <linux/etherdevice.h> |
| 66 | #include <linux/if_ether.h> |
| 67 | |
| 68 | #include <asm/byteorder.h> |
| 69 | |
Greg Kroah-Hartman | 00b3ed1 | 2008-10-02 11:29:28 -0700 | [diff] [blame] | 70 | #include "wlan_compat.h" |
| 71 | |
| 72 | /*================================================================*/ |
| 73 | /* Project Includes */ |
| 74 | |
| 75 | #include "p80211types.h" |
| 76 | #include "p80211hdr.h" |
| 77 | #include "p80211conv.h" |
| 78 | #include "p80211mgmt.h" |
| 79 | #include "p80211msg.h" |
| 80 | #include "p80211netdev.h" |
| 81 | #include "p80211ioctl.h" |
| 82 | #include "p80211req.h" |
| 83 | |
| 84 | |
| 85 | /*================================================================*/ |
| 86 | /* Local Constants */ |
| 87 | |
| 88 | /*================================================================*/ |
| 89 | /* Local Macros */ |
| 90 | |
| 91 | |
| 92 | /*================================================================*/ |
| 93 | /* Local Types */ |
| 94 | |
| 95 | |
| 96 | /*================================================================*/ |
| 97 | /* Local Static Definitions */ |
| 98 | |
Solomon Peachy | aaad430 | 2008-10-29 10:42:53 -0400 | [diff] [blame] | 99 | static u8 oui_rfc1042[] = {0x00, 0x00, 0x00}; |
| 100 | static u8 oui_8021h[] = {0x00, 0x00, 0xf8}; |
Greg Kroah-Hartman | 00b3ed1 | 2008-10-02 11:29:28 -0700 | [diff] [blame] | 101 | |
| 102 | /*================================================================*/ |
| 103 | /* Local Function Declarations */ |
| 104 | |
| 105 | |
| 106 | /*================================================================*/ |
| 107 | /* Function Definitions */ |
| 108 | |
| 109 | /*---------------------------------------------------------------- |
| 110 | * p80211pb_ether_to_80211 |
| 111 | * |
| 112 | * Uses the contents of the ether frame and the etherconv setting |
| 113 | * to build the elements of the 802.11 frame. |
| 114 | * |
| 115 | * We don't actually set |
| 116 | * up the frame header here. That's the MAC's job. We're only handling |
| 117 | * conversion of DIXII or 802.3+LLC frames to something that works |
| 118 | * with 802.11. |
| 119 | * |
| 120 | * Note -- 802.11 header is NOT part of the skb. Likewise, the 802.11 |
| 121 | * FCS is also not present and will need to be added elsewhere. |
| 122 | * |
| 123 | * Arguments: |
| 124 | * ethconv Conversion type to perform |
| 125 | * skb skbuff containing the ether frame |
| 126 | * p80211_hdr 802.11 header |
| 127 | * |
| 128 | * Returns: |
| 129 | * 0 on success, non-zero otherwise |
| 130 | * |
| 131 | * Call context: |
| 132 | * May be called in interrupt or non-interrupt context |
| 133 | ----------------------------------------------------------------*/ |
Solomon Peachy | aaad430 | 2008-10-29 10:42:53 -0400 | [diff] [blame] | 134 | int skb_ether_to_p80211( wlandevice_t *wlandev, u32 ethconv, struct sk_buff *skb, p80211_hdr_t *p80211_hdr, p80211_metawep_t *p80211_wep) |
Greg Kroah-Hartman | 00b3ed1 | 2008-10-02 11:29:28 -0700 | [diff] [blame] | 135 | { |
| 136 | |
Solomon Peachy | aaad430 | 2008-10-29 10:42:53 -0400 | [diff] [blame] | 137 | u16 fc; |
| 138 | u16 proto; |
Greg Kroah-Hartman | 00b3ed1 | 2008-10-02 11:29:28 -0700 | [diff] [blame] | 139 | wlan_ethhdr_t e_hdr; |
| 140 | wlan_llc_t *e_llc; |
| 141 | wlan_snap_t *e_snap; |
| 142 | int foo; |
| 143 | |
| 144 | DBFENTER; |
| 145 | memcpy(&e_hdr, skb->data, sizeof(e_hdr)); |
| 146 | |
| 147 | if (skb->len <= 0) { |
| 148 | WLAN_LOG_DEBUG(1, "zero-length skb!\n"); |
| 149 | return 1; |
| 150 | } |
| 151 | |
| 152 | if ( ethconv == WLAN_ETHCONV_ENCAP ) { /* simplest case */ |
| 153 | WLAN_LOG_DEBUG(3, "ENCAP len: %d\n", skb->len); |
| 154 | /* here, we don't care what kind of ether frm. Just stick it */ |
| 155 | /* in the 80211 payload */ |
| 156 | /* which is to say, leave the skb alone. */ |
| 157 | } else { |
| 158 | /* step 1: classify ether frame, DIX or 802.3? */ |
| 159 | proto = ntohs(e_hdr.type); |
| 160 | if ( proto <= 1500 ) { |
| 161 | WLAN_LOG_DEBUG(3, "802.3 len: %d\n", skb->len); |
| 162 | /* codes <= 1500 reserved for 802.3 lengths */ |
| 163 | /* it's 802.3, pass ether payload unchanged, */ |
| 164 | |
| 165 | /* trim off ethernet header */ |
| 166 | skb_pull(skb, WLAN_ETHHDR_LEN); |
| 167 | |
| 168 | /* leave off any PAD octets. */ |
| 169 | skb_trim(skb, proto); |
| 170 | } else { |
| 171 | WLAN_LOG_DEBUG(3, "DIXII len: %d\n", skb->len); |
| 172 | /* it's DIXII, time for some conversion */ |
| 173 | |
| 174 | /* trim off ethernet header */ |
| 175 | skb_pull(skb, WLAN_ETHHDR_LEN); |
| 176 | |
| 177 | /* tack on SNAP */ |
| 178 | e_snap = (wlan_snap_t *) skb_push(skb, sizeof(wlan_snap_t)); |
| 179 | e_snap->type = htons(proto); |
| 180 | if ( ethconv == WLAN_ETHCONV_8021h && p80211_stt_findproto(proto) ) { |
| 181 | memcpy( e_snap->oui, oui_8021h, WLAN_IEEE_OUI_LEN); |
| 182 | } else { |
| 183 | memcpy( e_snap->oui, oui_rfc1042, WLAN_IEEE_OUI_LEN); |
| 184 | } |
| 185 | |
| 186 | /* tack on llc */ |
| 187 | e_llc = (wlan_llc_t *) skb_push(skb, sizeof(wlan_llc_t)); |
| 188 | e_llc->dsap = 0xAA; /* SNAP, see IEEE 802 */ |
| 189 | e_llc->ssap = 0xAA; |
| 190 | e_llc->ctl = 0x03; |
| 191 | |
| 192 | } |
| 193 | } |
| 194 | |
| 195 | /* Set up the 802.11 header */ |
| 196 | /* It's a data frame */ |
| 197 | fc = host2ieee16( WLAN_SET_FC_FTYPE(WLAN_FTYPE_DATA) | |
| 198 | WLAN_SET_FC_FSTYPE(WLAN_FSTYPE_DATAONLY)); |
| 199 | |
| 200 | switch ( wlandev->macmode ) { |
| 201 | case WLAN_MACMODE_IBSS_STA: |
| 202 | memcpy(p80211_hdr->a3.a1, &e_hdr.daddr, WLAN_ADDR_LEN); |
| 203 | memcpy(p80211_hdr->a3.a2, wlandev->netdev->dev_addr, WLAN_ADDR_LEN); |
| 204 | memcpy(p80211_hdr->a3.a3, wlandev->bssid, WLAN_ADDR_LEN); |
| 205 | break; |
| 206 | case WLAN_MACMODE_ESS_STA: |
| 207 | fc |= host2ieee16(WLAN_SET_FC_TODS(1)); |
| 208 | memcpy(p80211_hdr->a3.a1, wlandev->bssid, WLAN_ADDR_LEN); |
| 209 | memcpy(p80211_hdr->a3.a2, wlandev->netdev->dev_addr, WLAN_ADDR_LEN); |
| 210 | memcpy(p80211_hdr->a3.a3, &e_hdr.daddr, WLAN_ADDR_LEN); |
| 211 | break; |
| 212 | case WLAN_MACMODE_ESS_AP: |
| 213 | fc |= host2ieee16(WLAN_SET_FC_FROMDS(1)); |
| 214 | memcpy(p80211_hdr->a3.a1, &e_hdr.daddr, WLAN_ADDR_LEN); |
| 215 | memcpy(p80211_hdr->a3.a2, wlandev->bssid, WLAN_ADDR_LEN); |
| 216 | memcpy(p80211_hdr->a3.a3, &e_hdr.saddr, WLAN_ADDR_LEN); |
| 217 | break; |
| 218 | default: |
| 219 | WLAN_LOG_ERROR("Error: Converting eth to wlan in unknown mode.\n"); |
| 220 | return 1; |
| 221 | break; |
| 222 | } |
| 223 | |
| 224 | p80211_wep->data = NULL; |
| 225 | |
| 226 | if ((wlandev->hostwep & HOSTWEP_PRIVACYINVOKED) && (wlandev->hostwep & HOSTWEP_ENCRYPT)) { |
| 227 | // XXXX need to pick keynum other than default? |
| 228 | |
| 229 | #if 1 |
| 230 | p80211_wep->data = kmalloc(skb->len, GFP_ATOMIC); |
| 231 | #else |
| 232 | p80211_wep->data = skb->data; |
| 233 | #endif |
| 234 | |
| 235 | if ((foo = wep_encrypt(wlandev, skb->data, p80211_wep->data, |
| 236 | skb->len, |
| 237 | (wlandev->hostwep & HOSTWEP_DEFAULTKEY_MASK), |
| 238 | p80211_wep->iv, p80211_wep->icv))) { |
| 239 | WLAN_LOG_WARNING("Host en-WEP failed, dropping frame (%d).\n", foo); |
| 240 | return 2; |
| 241 | } |
| 242 | fc |= host2ieee16(WLAN_SET_FC_ISWEP(1)); |
| 243 | } |
| 244 | |
| 245 | |
| 246 | // skb->nh.raw = skb->data; |
| 247 | |
| 248 | p80211_hdr->a3.fc = fc; |
| 249 | p80211_hdr->a3.dur = 0; |
| 250 | p80211_hdr->a3.seq = 0; |
| 251 | |
| 252 | DBFEXIT; |
| 253 | return 0; |
| 254 | } |
| 255 | |
| 256 | /* jkriegl: from orinoco, modified */ |
| 257 | static void orinoco_spy_gather(wlandevice_t *wlandev, char *mac, |
| 258 | p80211_rxmeta_t *rxmeta) |
| 259 | { |
| 260 | int i; |
| 261 | |
| 262 | /* Gather wireless spy statistics: for each packet, compare the |
| 263 | * source address with out list, and if match, get the stats... */ |
| 264 | |
| 265 | for (i = 0; i < wlandev->spy_number; i++) { |
| 266 | |
| 267 | if (!memcmp(wlandev->spy_address[i], mac, ETH_ALEN)) { |
| 268 | memcpy(wlandev->spy_address[i], mac, ETH_ALEN); |
| 269 | wlandev->spy_stat[i].level = rxmeta->signal; |
| 270 | wlandev->spy_stat[i].noise = rxmeta->noise; |
| 271 | wlandev->spy_stat[i].qual = (rxmeta->signal > rxmeta->noise) ? \ |
| 272 | (rxmeta->signal - rxmeta->noise) : 0; |
| 273 | wlandev->spy_stat[i].updated = 0x7; |
| 274 | } |
| 275 | } |
| 276 | } |
| 277 | |
| 278 | /*---------------------------------------------------------------- |
| 279 | * p80211pb_80211_to_ether |
| 280 | * |
| 281 | * Uses the contents of a received 802.11 frame and the etherconv |
| 282 | * setting to build an ether frame. |
| 283 | * |
| 284 | * This function extracts the src and dest address from the 802.11 |
| 285 | * frame to use in the construction of the eth frame. |
| 286 | * |
| 287 | * Arguments: |
| 288 | * ethconv Conversion type to perform |
| 289 | * skb Packet buffer containing the 802.11 frame |
| 290 | * |
| 291 | * Returns: |
| 292 | * 0 on success, non-zero otherwise |
| 293 | * |
| 294 | * Call context: |
| 295 | * May be called in interrupt or non-interrupt context |
| 296 | ----------------------------------------------------------------*/ |
Solomon Peachy | aaad430 | 2008-10-29 10:42:53 -0400 | [diff] [blame] | 297 | int skb_p80211_to_ether( wlandevice_t *wlandev, u32 ethconv, struct sk_buff *skb) |
Greg Kroah-Hartman | 00b3ed1 | 2008-10-02 11:29:28 -0700 | [diff] [blame] | 298 | { |
| 299 | netdevice_t *netdev = wlandev->netdev; |
Solomon Peachy | aaad430 | 2008-10-29 10:42:53 -0400 | [diff] [blame] | 300 | u16 fc; |
| 301 | unsigned int payload_length; |
| 302 | unsigned int payload_offset; |
| 303 | u8 daddr[WLAN_ETHADDR_LEN]; |
| 304 | u8 saddr[WLAN_ETHADDR_LEN]; |
Greg Kroah-Hartman | 00b3ed1 | 2008-10-02 11:29:28 -0700 | [diff] [blame] | 305 | p80211_hdr_t *w_hdr; |
| 306 | wlan_ethhdr_t *e_hdr; |
| 307 | wlan_llc_t *e_llc; |
| 308 | wlan_snap_t *e_snap; |
| 309 | |
| 310 | int foo; |
| 311 | |
| 312 | DBFENTER; |
| 313 | |
| 314 | payload_length = skb->len - WLAN_HDR_A3_LEN - WLAN_CRC_LEN; |
| 315 | payload_offset = WLAN_HDR_A3_LEN; |
| 316 | |
| 317 | w_hdr = (p80211_hdr_t *) skb->data; |
| 318 | |
| 319 | /* setup some vars for convenience */ |
| 320 | fc = ieee2host16(w_hdr->a3.fc); |
| 321 | if ( (WLAN_GET_FC_TODS(fc) == 0) && (WLAN_GET_FC_FROMDS(fc) == 0) ) { |
| 322 | memcpy(daddr, w_hdr->a3.a1, WLAN_ETHADDR_LEN); |
| 323 | memcpy(saddr, w_hdr->a3.a2, WLAN_ETHADDR_LEN); |
| 324 | } else if( (WLAN_GET_FC_TODS(fc) == 0) && (WLAN_GET_FC_FROMDS(fc) == 1) ) { |
| 325 | memcpy(daddr, w_hdr->a3.a1, WLAN_ETHADDR_LEN); |
| 326 | memcpy(saddr, w_hdr->a3.a3, WLAN_ETHADDR_LEN); |
| 327 | } else if( (WLAN_GET_FC_TODS(fc) == 1) && (WLAN_GET_FC_FROMDS(fc) == 0) ) { |
| 328 | memcpy(daddr, w_hdr->a3.a3, WLAN_ETHADDR_LEN); |
| 329 | memcpy(saddr, w_hdr->a3.a2, WLAN_ETHADDR_LEN); |
| 330 | } else { |
| 331 | payload_offset = WLAN_HDR_A4_LEN; |
| 332 | payload_length -= ( WLAN_HDR_A4_LEN - WLAN_HDR_A3_LEN ); |
| 333 | if (payload_length < 0 ) { |
| 334 | WLAN_LOG_ERROR("A4 frame too short!\n"); |
| 335 | return 1; |
| 336 | } |
| 337 | memcpy(daddr, w_hdr->a4.a3, WLAN_ETHADDR_LEN); |
| 338 | memcpy(saddr, w_hdr->a4.a4, WLAN_ETHADDR_LEN); |
| 339 | } |
| 340 | |
| 341 | /* perform de-wep if necessary.. */ |
| 342 | if ((wlandev->hostwep & HOSTWEP_PRIVACYINVOKED) && WLAN_GET_FC_ISWEP(fc) && (wlandev->hostwep & HOSTWEP_DECRYPT)) { |
| 343 | if (payload_length <= 8) { |
| 344 | WLAN_LOG_ERROR("WEP frame too short (%u).\n", |
| 345 | skb->len); |
| 346 | return 1; |
| 347 | } |
| 348 | if ((foo = wep_decrypt(wlandev, skb->data + payload_offset + 4, |
| 349 | payload_length - 8, -1, |
| 350 | skb->data + payload_offset, |
| 351 | skb->data + payload_offset + payload_length - 4))) { |
| 352 | /* de-wep failed, drop skb. */ |
| 353 | WLAN_LOG_DEBUG(1, "Host de-WEP failed, dropping frame (%d).\n", foo); |
| 354 | wlandev->rx.decrypt_err++; |
| 355 | return 2; |
| 356 | } |
| 357 | |
| 358 | /* subtract the IV+ICV length off the payload */ |
| 359 | payload_length -= 8; |
| 360 | /* chop off the IV */ |
| 361 | skb_pull(skb, 4); |
| 362 | /* chop off the ICV. */ |
| 363 | skb_trim(skb, skb->len - 4); |
| 364 | |
| 365 | wlandev->rx.decrypt++; |
| 366 | } |
| 367 | |
| 368 | e_hdr = (wlan_ethhdr_t *) (skb->data + payload_offset); |
| 369 | |
| 370 | e_llc = (wlan_llc_t *) (skb->data + payload_offset); |
| 371 | e_snap = (wlan_snap_t *) (skb->data + payload_offset + sizeof(wlan_llc_t)); |
| 372 | |
| 373 | /* Test for the various encodings */ |
| 374 | if ( (payload_length >= sizeof(wlan_ethhdr_t)) && |
| 375 | ( e_llc->dsap != 0xaa || e_llc->ssap != 0xaa ) && |
| 376 | ((memcmp(daddr, e_hdr->daddr, WLAN_ETHADDR_LEN) == 0) || |
| 377 | (memcmp(saddr, e_hdr->saddr, WLAN_ETHADDR_LEN) == 0))) { |
| 378 | WLAN_LOG_DEBUG(3, "802.3 ENCAP len: %d\n", payload_length); |
| 379 | /* 802.3 Encapsulated */ |
Richard Kennedy | 33ce0ca | 2008-11-03 11:24:54 +0000 | [diff] [blame^] | 380 | /* Test for an overlength frame */ |
| 381 | if ( payload_length > (netdev->mtu + WLAN_ETHHDR_LEN)) { |
| 382 | /* A bogus length ethfrm has been encap'd. */ |
| 383 | /* Is someone trying an oflow attack? */ |
| 384 | WLAN_LOG_ERROR("ENCAP frame too large (%d > %d)\n", |
| 385 | payload_length, netdev->mtu + WLAN_ETHHDR_LEN); |
| 386 | return 1; |
| 387 | } |
Greg Kroah-Hartman | 00b3ed1 | 2008-10-02 11:29:28 -0700 | [diff] [blame] | 388 | |
| 389 | /* Chop off the 802.11 header. it's already sane. */ |
| 390 | skb_pull(skb, payload_offset); |
| 391 | /* chop off the 802.11 CRC */ |
| 392 | skb_trim(skb, skb->len - WLAN_CRC_LEN); |
| 393 | |
| 394 | } else if ((payload_length >= sizeof(wlan_llc_t) + sizeof(wlan_snap_t)) && |
| 395 | (e_llc->dsap == 0xaa) && |
| 396 | (e_llc->ssap == 0xaa) && |
| 397 | (e_llc->ctl == 0x03) && |
| 398 | (((memcmp( e_snap->oui, oui_rfc1042, WLAN_IEEE_OUI_LEN)==0) && |
| 399 | (ethconv == WLAN_ETHCONV_8021h) && |
| 400 | (p80211_stt_findproto(ieee2host16(e_snap->type)))) || |
| 401 | (memcmp( e_snap->oui, oui_rfc1042, WLAN_IEEE_OUI_LEN)!=0))) |
| 402 | { |
| 403 | WLAN_LOG_DEBUG(3, "SNAP+RFC1042 len: %d\n", payload_length); |
| 404 | /* it's a SNAP + RFC1042 frame && protocol is in STT */ |
| 405 | /* build 802.3 + RFC1042 */ |
| 406 | |
Richard Kennedy | 33ce0ca | 2008-11-03 11:24:54 +0000 | [diff] [blame^] | 407 | /* Test for an overlength frame */ |
| 408 | if ( payload_length > netdev->mtu ) { |
| 409 | /* A bogus length ethfrm has been sent. */ |
| 410 | /* Is someone trying an oflow attack? */ |
| 411 | WLAN_LOG_ERROR("SNAP frame too large (%d > %d)\n", |
| 412 | payload_length, netdev->mtu); |
| 413 | return 1; |
| 414 | } |
| 415 | |
Greg Kroah-Hartman | 00b3ed1 | 2008-10-02 11:29:28 -0700 | [diff] [blame] | 416 | /* chop 802.11 header from skb. */ |
| 417 | skb_pull(skb, payload_offset); |
| 418 | |
| 419 | /* create 802.3 header at beginning of skb. */ |
| 420 | e_hdr = (wlan_ethhdr_t *) skb_push(skb, WLAN_ETHHDR_LEN); |
| 421 | memcpy(e_hdr->daddr, daddr, WLAN_ETHADDR_LEN); |
| 422 | memcpy(e_hdr->saddr, saddr, WLAN_ETHADDR_LEN); |
| 423 | e_hdr->type = htons(payload_length); |
| 424 | |
| 425 | /* chop off the 802.11 CRC */ |
| 426 | skb_trim(skb, skb->len - WLAN_CRC_LEN); |
| 427 | |
| 428 | } else if ((payload_length >= sizeof(wlan_llc_t) + sizeof(wlan_snap_t)) && |
| 429 | (e_llc->dsap == 0xaa) && |
| 430 | (e_llc->ssap == 0xaa) && |
| 431 | (e_llc->ctl == 0x03) ) { |
| 432 | WLAN_LOG_DEBUG(3, "802.1h/RFC1042 len: %d\n", payload_length); |
| 433 | /* it's an 802.1h frame || (an RFC1042 && protocol is not in STT) */ |
| 434 | /* build a DIXII + RFC894 */ |
| 435 | |
Richard Kennedy | 33ce0ca | 2008-11-03 11:24:54 +0000 | [diff] [blame^] | 436 | /* Test for an overlength frame */ |
| 437 | if ((payload_length - sizeof(wlan_llc_t) - sizeof(wlan_snap_t)) |
| 438 | > netdev->mtu) { |
| 439 | /* A bogus length ethfrm has been sent. */ |
| 440 | /* Is someone trying an oflow attack? */ |
| 441 | WLAN_LOG_ERROR("DIXII frame too large (%ld > %d)\n", |
| 442 | (long int) (payload_length - sizeof(wlan_llc_t) - |
| 443 | sizeof(wlan_snap_t)), |
| 444 | netdev->mtu); |
| 445 | return 1; |
| 446 | } |
| 447 | |
Greg Kroah-Hartman | 00b3ed1 | 2008-10-02 11:29:28 -0700 | [diff] [blame] | 448 | /* chop 802.11 header from skb. */ |
| 449 | skb_pull(skb, payload_offset); |
| 450 | |
| 451 | /* chop llc header from skb. */ |
| 452 | skb_pull(skb, sizeof(wlan_llc_t)); |
| 453 | |
| 454 | /* chop snap header from skb. */ |
| 455 | skb_pull(skb, sizeof(wlan_snap_t)); |
| 456 | |
| 457 | /* create 802.3 header at beginning of skb. */ |
| 458 | e_hdr = (wlan_ethhdr_t *) skb_push(skb, WLAN_ETHHDR_LEN); |
| 459 | e_hdr->type = e_snap->type; |
| 460 | memcpy(e_hdr->daddr, daddr, WLAN_ETHADDR_LEN); |
| 461 | memcpy(e_hdr->saddr, saddr, WLAN_ETHADDR_LEN); |
| 462 | |
| 463 | /* chop off the 802.11 CRC */ |
| 464 | skb_trim(skb, skb->len - WLAN_CRC_LEN); |
| 465 | } else { |
| 466 | WLAN_LOG_DEBUG(3, "NON-ENCAP len: %d\n", payload_length); |
| 467 | /* any NON-ENCAP */ |
| 468 | /* it's a generic 80211+LLC or IPX 'Raw 802.3' */ |
| 469 | /* build an 802.3 frame */ |
| 470 | /* allocate space and setup hostbuf */ |
| 471 | |
Richard Kennedy | 33ce0ca | 2008-11-03 11:24:54 +0000 | [diff] [blame^] | 472 | /* Test for an overlength frame */ |
| 473 | if ( payload_length > netdev->mtu ) { |
| 474 | /* A bogus length ethfrm has been sent. */ |
| 475 | /* Is someone trying an oflow attack? */ |
| 476 | WLAN_LOG_ERROR("OTHER frame too large (%d > %d)\n", |
| 477 | payload_length, |
| 478 | netdev->mtu); |
| 479 | return 1; |
| 480 | } |
| 481 | |
Greg Kroah-Hartman | 00b3ed1 | 2008-10-02 11:29:28 -0700 | [diff] [blame] | 482 | /* Chop off the 802.11 header. */ |
| 483 | skb_pull(skb, payload_offset); |
| 484 | |
| 485 | /* create 802.3 header at beginning of skb. */ |
| 486 | e_hdr = (wlan_ethhdr_t *) skb_push(skb, WLAN_ETHHDR_LEN); |
| 487 | memcpy(e_hdr->daddr, daddr, WLAN_ETHADDR_LEN); |
| 488 | memcpy(e_hdr->saddr, saddr, WLAN_ETHADDR_LEN); |
| 489 | e_hdr->type = htons(payload_length); |
| 490 | |
| 491 | /* chop off the 802.11 CRC */ |
| 492 | skb_trim(skb, skb->len - WLAN_CRC_LEN); |
| 493 | |
| 494 | } |
| 495 | |
Richard Kennedy | 33ce0ca | 2008-11-03 11:24:54 +0000 | [diff] [blame^] | 496 | /* |
| 497 | * Note that eth_type_trans() expects an skb w/ skb->data pointing |
| 498 | * at the MAC header, it then sets the following skb members: |
| 499 | * skb->mac_header, |
| 500 | * skb->data, and |
| 501 | * skb->pkt_type. |
| 502 | * It then _returns_ the value that _we're_ supposed to stuff in |
| 503 | * skb->protocol. This is nuts. |
| 504 | */ |
Greg Kroah-Hartman | 00b3ed1 | 2008-10-02 11:29:28 -0700 | [diff] [blame] | 505 | skb->protocol = eth_type_trans(skb, netdev); |
Greg Kroah-Hartman | 00b3ed1 | 2008-10-02 11:29:28 -0700 | [diff] [blame] | 506 | |
| 507 | /* jkriegl: process signal and noise as set in hfa384x_int_rx() */ |
| 508 | /* jkriegl: only process signal/noise if requested by iwspy */ |
| 509 | if (wlandev->spy_number) |
| 510 | orinoco_spy_gather(wlandev, eth_hdr(skb)->h_source, P80211SKB_RXMETA(skb)); |
| 511 | |
| 512 | /* Free the metadata */ |
| 513 | p80211skb_rxmeta_detach(skb); |
| 514 | |
| 515 | DBFEXIT; |
| 516 | return 0; |
| 517 | } |
| 518 | |
| 519 | /*---------------------------------------------------------------- |
| 520 | * p80211_stt_findproto |
| 521 | * |
| 522 | * Searches the 802.1h Selective Translation Table for a given |
| 523 | * protocol. |
| 524 | * |
| 525 | * Arguments: |
| 526 | * proto protocl number (in host order) to search for. |
| 527 | * |
| 528 | * Returns: |
| 529 | * 1 - if the table is empty or a match is found. |
| 530 | * 0 - if the table is non-empty and a match is not found. |
| 531 | * |
| 532 | * Call context: |
| 533 | * May be called in interrupt or non-interrupt context |
| 534 | ----------------------------------------------------------------*/ |
Solomon Peachy | aaad430 | 2008-10-29 10:42:53 -0400 | [diff] [blame] | 535 | int p80211_stt_findproto(u16 proto) |
Greg Kroah-Hartman | 00b3ed1 | 2008-10-02 11:29:28 -0700 | [diff] [blame] | 536 | { |
| 537 | /* Always return found for now. This is the behavior used by the */ |
| 538 | /* Zoom Win95 driver when 802.1h mode is selected */ |
| 539 | /* TODO: If necessary, add an actual search we'll probably |
| 540 | need this to match the CMAC's way of doing things. |
| 541 | Need to do some testing to confirm. |
| 542 | */ |
| 543 | |
| 544 | if (proto == 0x80f3) /* APPLETALK */ |
| 545 | return 1; |
| 546 | |
| 547 | return 0; |
| 548 | } |
| 549 | |
| 550 | /*---------------------------------------------------------------- |
| 551 | * p80211skb_rxmeta_detach |
| 552 | * |
| 553 | * Disconnects the frmmeta and rxmeta from an skb. |
| 554 | * |
| 555 | * Arguments: |
| 556 | * wlandev The wlandev this skb belongs to. |
| 557 | * skb The skb we're attaching to. |
| 558 | * |
| 559 | * Returns: |
| 560 | * 0 on success, non-zero otherwise |
| 561 | * |
| 562 | * Call context: |
| 563 | * May be called in interrupt or non-interrupt context |
| 564 | ----------------------------------------------------------------*/ |
| 565 | void |
| 566 | p80211skb_rxmeta_detach(struct sk_buff *skb) |
| 567 | { |
| 568 | p80211_rxmeta_t *rxmeta; |
| 569 | p80211_frmmeta_t *frmmeta; |
| 570 | |
| 571 | DBFENTER; |
| 572 | /* Sanity checks */ |
| 573 | if ( skb==NULL ) { /* bad skb */ |
| 574 | WLAN_LOG_DEBUG(1, "Called w/ null skb.\n"); |
| 575 | goto exit; |
| 576 | } |
| 577 | frmmeta = P80211SKB_FRMMETA(skb); |
| 578 | if ( frmmeta == NULL ) { /* no magic */ |
| 579 | WLAN_LOG_DEBUG(1, "Called w/ bad frmmeta magic.\n"); |
| 580 | goto exit; |
| 581 | } |
| 582 | rxmeta = frmmeta->rx; |
| 583 | if ( rxmeta == NULL ) { /* bad meta ptr */ |
| 584 | WLAN_LOG_DEBUG(1, "Called w/ bad rxmeta ptr.\n"); |
| 585 | goto exit; |
| 586 | } |
| 587 | |
| 588 | /* Free rxmeta */ |
| 589 | kfree(rxmeta); |
| 590 | |
| 591 | /* Clear skb->cb */ |
| 592 | memset(skb->cb, 0, sizeof(skb->cb)); |
| 593 | exit: |
| 594 | DBFEXIT; |
| 595 | return; |
| 596 | } |
| 597 | |
| 598 | /*---------------------------------------------------------------- |
| 599 | * p80211skb_rxmeta_attach |
| 600 | * |
| 601 | * Allocates a p80211rxmeta structure, initializes it, and attaches |
| 602 | * it to an skb. |
| 603 | * |
| 604 | * Arguments: |
| 605 | * wlandev The wlandev this skb belongs to. |
| 606 | * skb The skb we're attaching to. |
| 607 | * |
| 608 | * Returns: |
| 609 | * 0 on success, non-zero otherwise |
| 610 | * |
| 611 | * Call context: |
| 612 | * May be called in interrupt or non-interrupt context |
| 613 | ----------------------------------------------------------------*/ |
| 614 | int |
| 615 | p80211skb_rxmeta_attach(struct wlandevice *wlandev, struct sk_buff *skb) |
| 616 | { |
| 617 | int result = 0; |
| 618 | p80211_rxmeta_t *rxmeta; |
| 619 | p80211_frmmeta_t *frmmeta; |
| 620 | |
| 621 | DBFENTER; |
| 622 | |
| 623 | /* If these already have metadata, we error out! */ |
| 624 | if (P80211SKB_RXMETA(skb) != NULL) { |
| 625 | WLAN_LOG_ERROR("%s: RXmeta already attached!\n", |
| 626 | wlandev->name); |
| 627 | result = 0; |
| 628 | goto exit; |
| 629 | } |
| 630 | |
| 631 | /* Allocate the rxmeta */ |
| 632 | rxmeta = kmalloc(sizeof(p80211_rxmeta_t), GFP_ATOMIC); |
| 633 | |
| 634 | if ( rxmeta == NULL ) { |
| 635 | WLAN_LOG_ERROR("%s: Failed to allocate rxmeta.\n", |
| 636 | wlandev->name); |
| 637 | result = 1; |
| 638 | goto exit; |
| 639 | } |
| 640 | |
| 641 | /* Initialize the rxmeta */ |
| 642 | memset(rxmeta, 0, sizeof(p80211_rxmeta_t)); |
| 643 | rxmeta->wlandev = wlandev; |
| 644 | rxmeta->hosttime = jiffies; |
| 645 | |
| 646 | /* Overlay a frmmeta_t onto skb->cb */ |
| 647 | memset(skb->cb, 0, sizeof(p80211_frmmeta_t)); |
| 648 | frmmeta = (p80211_frmmeta_t*)(skb->cb); |
| 649 | frmmeta->magic = P80211_FRMMETA_MAGIC; |
| 650 | frmmeta->rx = rxmeta; |
| 651 | exit: |
| 652 | DBFEXIT; |
| 653 | return result; |
| 654 | } |
| 655 | |
| 656 | /*---------------------------------------------------------------- |
| 657 | * p80211skb_free |
| 658 | * |
| 659 | * Frees an entire p80211skb by checking and freeing the meta struct |
| 660 | * and then freeing the skb. |
| 661 | * |
| 662 | * Arguments: |
| 663 | * wlandev The wlandev this skb belongs to. |
| 664 | * skb The skb we're attaching to. |
| 665 | * |
| 666 | * Returns: |
| 667 | * 0 on success, non-zero otherwise |
| 668 | * |
| 669 | * Call context: |
| 670 | * May be called in interrupt or non-interrupt context |
| 671 | ----------------------------------------------------------------*/ |
| 672 | void |
| 673 | p80211skb_free(struct wlandevice *wlandev, struct sk_buff *skb) |
| 674 | { |
| 675 | p80211_frmmeta_t *meta; |
| 676 | DBFENTER; |
| 677 | meta = P80211SKB_FRMMETA(skb); |
| 678 | if ( meta && meta->rx) { |
| 679 | p80211skb_rxmeta_detach(skb); |
| 680 | } else { |
| 681 | WLAN_LOG_ERROR("Freeing an skb (%p) w/ no frmmeta.\n", skb); |
| 682 | } |
| 683 | |
| 684 | dev_kfree_skb(skb); |
| 685 | DBFEXIT; |
| 686 | return; |
| 687 | } |