2 * Some parts based on code from net80211
3 * Copyright (c) 2001 Atsushi Onoe
4 * Copyright (c) 2002-2005 Sam Leffler, Errno Consulting
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. The name of the author may not be used to endorse or promote products
16 * derived from this software without specific prior written permission.
18 * Alternatively, this software may be distributed under the terms of the
19 * GNU General Public License ("GPL") version 2 as published by the Free
20 * Software Foundation.
22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
25 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
27 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
31 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
35 #include "ieee80211softmac_priv.h"
37 /* Helper functions for inserting data into the frames */
40 * Adds an ESSID element to the frame
44 ieee80211softmac_add_essid(u8 *dst, struct ieee80211softmac_essid *essid)
47 *dst++ = MFIE_TYPE_SSID;
49 memcpy(dst, essid->data, essid->len);
50 return dst+essid->len;
52 *dst++ = MFIE_TYPE_SSID;
58 /* Adds Supported Rates and if required Extended Rates Information Element
59 * to the frame, ASSUMES WE HAVE A SORTED LIST OF RATES */
61 ieee80211softmac_frame_add_rates(u8 *dst, const struct ieee80211softmac_ratesinfo *r)
63 int cck_len, ofdm_len;
64 *dst++ = MFIE_TYPE_RATES;
66 for(cck_len=0; ieee80211_is_cck_rate(r->rates[cck_len]) && (cck_len < r->count);cck_len++);
68 if(cck_len > IEEE80211SOFTMAC_MAX_RATES_LEN)
69 cck_len = IEEE80211SOFTMAC_MAX_RATES_LEN;
71 memcpy(dst, r->rates, cck_len);
74 if(cck_len < r->count){
75 for (ofdm_len=0; ieee80211_is_ofdm_rate(r->rates[ofdm_len + cck_len]) && (ofdm_len + cck_len < r->count); ofdm_len++);
77 if (ofdm_len > IEEE80211SOFTMAC_MAX_EX_RATES_LEN)
78 ofdm_len = IEEE80211SOFTMAC_MAX_EX_RATES_LEN;
79 *dst++ = MFIE_TYPE_RATES_EX;
81 memcpy(dst, r->rates + cck_len, ofdm_len);
88 /* Allocate a management frame */
90 ieee80211softmac_alloc_mgt(u32 size)
94 /* Add the header and FCS to the size */
95 size = size + IEEE80211_3ADDR_LEN;
96 if(size > IEEE80211_DATA_LEN)
98 /* Allocate the frame */
99 data = kmalloc(size, GFP_ATOMIC);
100 memset(data, 0, size);
105 * Add a 2 Address Header
108 ieee80211softmac_hdr_2addr(struct ieee80211softmac_device *mac,
109 struct ieee80211_hdr_2addr *header, u32 type, u8 *dest)
111 /* Fill in the frame control flags */
112 header->frame_ctl = cpu_to_le16(type);
113 /* Control packets always have WEP turned off */
114 if(type > IEEE80211_STYPE_CFENDACK && type < IEEE80211_STYPE_PSPOLL)
115 header->frame_ctl |= mac->ieee->sec.level ? cpu_to_le16(IEEE80211_FCTL_PROTECTED) : 0;
117 /* Fill in the duration */
118 header->duration_id = 0;
119 /* FIXME: How do I find this?
120 * calculate. But most drivers just fill in 0 (except if it's a station id of course) */
122 /* Fill in the Destination Address */
124 memset(header->addr1, 0xFF, ETH_ALEN);
126 memcpy(header->addr1, dest, ETH_ALEN);
127 /* Fill in the Source Address */
128 memcpy(header->addr2, mac->ieee->dev->dev_addr, ETH_ALEN);
133 /* Add a 3 Address Header */
135 ieee80211softmac_hdr_3addr(struct ieee80211softmac_device *mac,
136 struct ieee80211_hdr_3addr *header, u32 type, u8 *dest, u8 *bssid)
138 /* This is common with 2addr, so use that instead */
139 ieee80211softmac_hdr_2addr(mac, (struct ieee80211_hdr_2addr *)header, type, dest);
141 /* Fill in the BSS ID */
143 memset(header->addr3, 0xFF, ETH_ALEN);
145 memcpy(header->addr3, bssid, ETH_ALEN);
147 /* Fill in the sequence # */
148 /* FIXME: I need to add this to the softmac struct
149 * shouldn't the sequence number be in ieee80211? */
153 /*****************************************************************************
154 * Create Management packets
155 *****************************************************************************/
157 /* Creates an association request packet */
159 ieee80211softmac_assoc_req(struct ieee80211_assoc_request **pkt,
160 struct ieee80211softmac_device *mac, struct ieee80211softmac_network *net)
163 (*pkt) = (struct ieee80211_assoc_request *)ieee80211softmac_alloc_mgt(
164 2 + /* Capability Info */
165 2 + /* Listen Interval */
167 1 + 1 + IW_ESSID_MAX_SIZE +
169 1 + 1 + IEEE80211SOFTMAC_MAX_RATES_LEN +
170 /* Extended Rates IE */
171 1 + 1 + IEEE80211SOFTMAC_MAX_EX_RATES_LEN +
172 /* WPA IE if present */
174 /* Other IE's? Optional?
175 * Yeah, probably need an extra IE parameter -- lots of vendors like to
176 * fill in their own IEs */
178 if (unlikely((*pkt) == NULL))
180 ieee80211softmac_hdr_3addr(mac, &((*pkt)->header), IEEE80211_STYPE_ASSOC_REQ, net->bssid, net->bssid);
182 /* Fill in capability Info */
183 switch (mac->ieee->iw_mode) {
185 (*pkt)->capability = cpu_to_le16(WLAN_CAPABILITY_ESS);
188 (*pkt)->capability = cpu_to_le16(WLAN_CAPABILITY_IBSS);
191 (*pkt)->capability = net->capabilities & (WLAN_CAPABILITY_ESS|WLAN_CAPABILITY_IBSS);
194 /* bleh. we don't ever go to these modes */
195 printk(KERN_ERR PFX "invalid iw_mode!\n");
199 (*pkt)->capability |= mac->ieee->short_slot ?
200 cpu_to_le16(WLAN_CAPABILITY_SHORT_SLOT_TIME) : 0;
202 (*pkt)->capability |= mac->ieee->sec.level ? cpu_to_le16(WLAN_CAPABILITY_PRIVACY) : 0;
203 /* Fill in Listen Interval (?) */
204 (*pkt)->listen_interval = cpu_to_le16(10);
206 data = (u8 *)(*pkt)->info_element;
208 data = ieee80211softmac_add_essid(data, &net->essid);
210 data = ieee80211softmac_frame_add_rates(data, &mac->ratesinfo);
212 if (mac->wpa.IElen && mac->wpa.IE) {
213 memcpy(data, mac->wpa.IE, mac->wpa.IElen);
214 data += mac->wpa.IElen;
216 /* Return the number of used bytes */
217 return (data - (u8*)(*pkt));
220 /* Create a reassociation request packet */
222 ieee80211softmac_reassoc_req(struct ieee80211_reassoc_request **pkt,
223 struct ieee80211softmac_device *mac, struct ieee80211softmac_network *net)
226 (*pkt) = (struct ieee80211_reassoc_request *)ieee80211softmac_alloc_mgt(
227 2 + /* Capability Info */
228 2 + /* Listen Interval */
229 ETH_ALEN + /* AP MAC */
231 1 + 1 + IW_ESSID_MAX_SIZE +
233 1 + 1 + IEEE80211SOFTMAC_MAX_RATES_LEN +
234 /* Extended Rates IE */
235 1 + 1 + IEEE80211SOFTMAC_MAX_EX_RATES_LEN
238 if (unlikely((*pkt) == NULL))
240 ieee80211softmac_hdr_3addr(mac, &((*pkt)->header), IEEE80211_STYPE_REASSOC_REQ, net->bssid, net->bssid);
242 /* Fill in capability Info */
243 (*pkt)->capability = mac->ieee->iw_mode == IW_MODE_MASTER ?
244 cpu_to_le16(WLAN_CAPABILITY_ESS) :
245 cpu_to_le16(WLAN_CAPABILITY_IBSS);
247 (*pkt)->capability |= mac->ieee->short_slot ?
248 cpu_to_le16(WLAN_CAPABILITY_SHORT_SLOT_TIME) : 0;
250 (*pkt)->capability |= mac->ieee->sec.level ?
251 cpu_to_le16(WLAN_CAPABILITY_PRIVACY) : 0;
253 /* Fill in Listen Interval (?) */
254 (*pkt)->listen_interval = cpu_to_le16(10);
255 /* Fill in the current AP MAC */
256 memcpy((*pkt)->current_ap, mac->ieee->bssid, ETH_ALEN);
258 data = (u8 *)(*pkt)->info_element;
260 data = ieee80211softmac_add_essid(data, &net->essid);
262 data = ieee80211softmac_frame_add_rates(data, &mac->ratesinfo);
263 /* Return packet size */
264 return (data - (u8 *)(*pkt));
267 /* Create an authentication packet */
269 ieee80211softmac_auth(struct ieee80211_auth **pkt,
270 struct ieee80211softmac_device *mac, struct ieee80211softmac_network *net,
271 u16 transaction, u16 status)
274 /* Allocate Packet */
275 (*pkt) = (struct ieee80211_auth *)ieee80211softmac_alloc_mgt(
276 2 + /* Auth Algorithm */
277 2 + /* Auth Transaction Seq */
278 2 + /* Status Code */
279 /* Challenge Text IE */
280 mac->ieee->open_wep ? 0 :
281 1 + 1 + WLAN_AUTH_CHALLENGE_LEN
283 if (unlikely((*pkt) == NULL))
285 ieee80211softmac_hdr_3addr(mac, &((*pkt)->header), IEEE80211_STYPE_AUTH, net->bssid, net->bssid);
288 (*pkt)->algorithm = mac->ieee->open_wep ?
289 cpu_to_le16(WLAN_AUTH_OPEN) :
290 cpu_to_le16(WLAN_AUTH_SHARED_KEY);
292 (*pkt)->transaction = cpu_to_le16(transaction);
294 (*pkt)->status = cpu_to_le16(status);
296 data = (u8 *)(*pkt)->info_element;
298 if(!mac->ieee->open_wep){
299 *data = MFIE_TYPE_CHALLENGE;
302 /* Copy the challenge in */
303 // *data = challenge length
304 // data += sizeof(u16);
305 // memcpy(data, challenge, challenge length);
306 // data += challenge length;
308 /* Add the full size to the packet length */
311 /* Return the packet size */
312 return (data - (u8 *)(*pkt));
315 /* Create a disassocation or deauthentication packet */
317 ieee80211softmac_disassoc_deauth(struct ieee80211_disassoc **pkt,
318 struct ieee80211softmac_device *mac, struct ieee80211softmac_network *net,
319 u16 type, u16 reason)
321 /* Allocate Packet */
322 (*pkt) = (struct ieee80211_disassoc *)ieee80211softmac_alloc_mgt(2);
323 if (unlikely((*pkt) == NULL))
325 ieee80211softmac_hdr_3addr(mac, &((*pkt)->header), type, net->bssid, net->bssid);
327 (*pkt)->reason = cpu_to_le16(reason);
328 /* Return the packet size */
329 return (2 + IEEE80211_3ADDR_LEN);
332 /* Create a probe request packet */
334 ieee80211softmac_probe_req(struct ieee80211_probe_request **pkt,
335 struct ieee80211softmac_device *mac, struct ieee80211softmac_essid *essid)
338 /* Allocate Packet */
339 (*pkt) = (struct ieee80211_probe_request *)ieee80211softmac_alloc_mgt(
340 /* SSID of requested network */
341 1 + 1 + IW_ESSID_MAX_SIZE +
343 1 + 1 + IEEE80211SOFTMAC_MAX_RATES_LEN +
344 /* Extended Rates IE */
345 1 + 1 + IEEE80211SOFTMAC_MAX_EX_RATES_LEN
347 if (unlikely((*pkt) == NULL))
349 ieee80211softmac_hdr_3addr(mac, &((*pkt)->header), IEEE80211_STYPE_PROBE_REQ, NULL, NULL);
351 data = (u8 *)(*pkt)->info_element;
352 /* Add ESSID (can be NULL) */
353 data = ieee80211softmac_add_essid(data, essid);
355 data = ieee80211softmac_frame_add_rates(data, &mac->ratesinfo);
356 /* Return packet size */
357 return (data - (u8 *)(*pkt));
360 /* Create a probe response packet */
361 /* FIXME: Not complete */
363 ieee80211softmac_probe_resp(struct ieee80211_probe_response **pkt,
364 struct ieee80211softmac_device *mac, struct ieee80211softmac_network *net)
367 /* Allocate Packet */
368 (*pkt) = (struct ieee80211_probe_response *)ieee80211softmac_alloc_mgt(
370 2 + /* Beacon Interval */
371 2 + /* Capability Info */
373 1 + 1 + IW_ESSID_MAX_SIZE +
374 7 + /* FH Parameter Set */
375 2 + /* DS Parameter Set */
376 8 + /* CF Parameter Set */
377 4 /* IBSS Parameter Set */
379 if (unlikely((*pkt) == NULL))
381 ieee80211softmac_hdr_3addr(mac, &((*pkt)->header), IEEE80211_STYPE_PROBE_RESP, net->bssid, net->bssid);
382 data = (u8 *)(*pkt)->info_element;
384 /* Return the packet size */
385 return (data - (u8 *)(*pkt));
389 /* Sends a manangement packet
390 * FIXME: document the use of the arg parameter
391 * for _AUTH: (transaction #) | (status << 16)
394 ieee80211softmac_send_mgt_frame(struct ieee80211softmac_device *mac,
395 void *ptrarg, u32 type, u32 arg)
401 case IEEE80211_STYPE_ASSOC_REQ:
402 pkt_size = ieee80211softmac_assoc_req((struct ieee80211_assoc_request **)(&pkt), mac, (struct ieee80211softmac_network *)ptrarg);
404 case IEEE80211_STYPE_REASSOC_REQ:
405 pkt_size = ieee80211softmac_reassoc_req((struct ieee80211_reassoc_request **)(&pkt), mac, (struct ieee80211softmac_network *)ptrarg);
407 case IEEE80211_STYPE_AUTH:
408 pkt_size = ieee80211softmac_auth((struct ieee80211_auth **)(&pkt), mac, (struct ieee80211softmac_network *)ptrarg, (u16)(arg & 0xFFFF), (u16) (arg >> 16));
410 case IEEE80211_STYPE_DISASSOC:
411 case IEEE80211_STYPE_DEAUTH:
412 pkt_size = ieee80211softmac_disassoc_deauth((struct ieee80211_disassoc **)(&pkt), mac, (struct ieee80211softmac_network *)ptrarg, type, (u16)(arg & 0xFFFF));
414 case IEEE80211_STYPE_PROBE_REQ:
415 pkt_size = ieee80211softmac_probe_req((struct ieee80211_probe_request **)(&pkt), mac, (struct ieee80211softmac_essid *)ptrarg);
417 case IEEE80211_STYPE_PROBE_RESP:
418 pkt_size = ieee80211softmac_probe_resp((struct ieee80211_probe_response **)(&pkt), mac, (struct ieee80211softmac_network *)ptrarg);
421 printkl(KERN_DEBUG PFX "Unsupported Management Frame type: %i\n", type);
425 if(pkt_size == 0 || pkt == NULL) {
426 printkl(KERN_DEBUG PFX "Error, packet is nonexistant or 0 length\n");
430 /* Send the packet to the ieee80211 layer for tx */
431 /* we defined softmac->mgmt_xmit for this. Should we keep it
432 * as it is (that means we'd need to wrap this into a txb),
433 * modify the prototype (so it matches this function),
434 * or get rid of it alltogether?
435 * Does this work for you now?
437 ieee80211_tx_frame(mac->ieee, (struct ieee80211_hdr *)pkt, pkt_size);
444 /* Create an rts/cts frame */
446 ieee80211softmac_rts_cts(struct ieee80211_hdr_2addr **pkt,
447 struct ieee80211softmac_device *mac, struct ieee80211softmac_network *net,
450 /* Allocate Packet */
451 (*pkt) = kmalloc(IEEE80211_2ADDR_LEN, GFP_ATOMIC);
452 memset(*pkt, 0, IEEE80211_2ADDR_LEN);
455 ieee80211softmac_hdr_2addr(mac, (*pkt), type, net->bssid);
456 return IEEE80211_2ADDR_LEN;
460 /* Sends a control packet */
462 ieee80211softmac_send_ctl_frame(struct ieee80211softmac_device *mac,
463 struct ieee80211softmac_network *net, u32 type, u32 arg)
469 case IEEE80211_STYPE_RTS:
470 case IEEE80211_STYPE_CTS:
471 pkt_size = ieee80211softmac_rts_cts((struct ieee80211_hdr_2addr **)(&pkt), mac, net, type);
474 printkl(KERN_DEBUG PFX "Unsupported Control Frame type: %i\n", type);
481 /* Send the packet to the ieee80211 layer for tx */
482 ieee80211_tx_frame(mac->ieee, (struct ieee80211_hdr *) pkt, pkt_size);