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b453872c JG |
1 | /****************************************************************************** |
2 | ||
ebeaddcc | 3 | Copyright(c) 2003 - 2005 Intel Corporation. All rights reserved. |
b453872c JG |
4 | |
5 | This program is free software; you can redistribute it and/or modify it | |
6 | under the terms of version 2 of the GNU General Public License as | |
7 | published by the Free Software Foundation. | |
8 | ||
9 | This program is distributed in the hope that it will be useful, but WITHOUT | |
10 | ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
12 | more details. | |
13 | ||
14 | You should have received a copy of the GNU General Public License along with | |
15 | this program; if not, write to the Free Software Foundation, Inc., 59 | |
16 | Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
17 | ||
18 | The full GNU General Public License is included in this distribution in the | |
19 | file called LICENSE. | |
20 | ||
21 | Contact Information: | |
22 | James P. Ketrenos <ipw2100-admin@linux.intel.com> | |
23 | Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497 | |
24 | ||
25 | ******************************************************************************/ | |
26 | #include <linux/compiler.h> | |
b453872c JG |
27 | #include <linux/errno.h> |
28 | #include <linux/if_arp.h> | |
29 | #include <linux/in6.h> | |
30 | #include <linux/in.h> | |
31 | #include <linux/ip.h> | |
32 | #include <linux/kernel.h> | |
33 | #include <linux/module.h> | |
34 | #include <linux/netdevice.h> | |
b453872c JG |
35 | #include <linux/proc_fs.h> |
36 | #include <linux/skbuff.h> | |
37 | #include <linux/slab.h> | |
38 | #include <linux/tcp.h> | |
39 | #include <linux/types.h> | |
b453872c JG |
40 | #include <linux/wireless.h> |
41 | #include <linux/etherdevice.h> | |
42 | #include <asm/uaccess.h> | |
43 | ||
44 | #include <net/ieee80211.h> | |
45 | ||
b453872c JG |
46 | /* |
47 | ||
b453872c JG |
48 | 802.11 Data Frame |
49 | ||
50 | ,-------------------------------------------------------------------. | |
51 | Bytes | 2 | 2 | 6 | 6 | 6 | 2 | 0..2312 | 4 | | |
52 | |------|------|---------|---------|---------|------|---------|------| | |
53 | Desc. | ctrl | dura | DA/RA | TA | SA | Sequ | Frame | fcs | | |
54 | | | tion | (BSSID) | | | ence | data | | | |
55 | `--------------------------------------------------| |------' | |
56 | Total: 28 non-data bytes `----.----' | |
57 | | | |
44d7a8cf DV |
58 | .- 'Frame data' expands, if WEP enabled, to <----------' |
59 | | | |
60 | V | |
61 | ,-----------------------. | |
62 | Bytes | 4 | 0-2296 | 4 | | |
63 | |-----|-----------|-----| | |
64 | Desc. | IV | Encrypted | ICV | | |
65 | | | Packet | | | |
66 | `-----| |-----' | |
67 | `-----.-----' | |
68 | | | |
69 | .- 'Encrypted Packet' expands to | |
b453872c JG |
70 | | |
71 | V | |
72 | ,---------------------------------------------------. | |
73 | Bytes | 1 | 1 | 1 | 3 | 2 | 0-2304 | | |
74 | |------|------|---------|----------|------|---------| | |
75 | Desc. | SNAP | SNAP | Control |Eth Tunnel| Type | IP | | |
76 | | DSAP | SSAP | | | | Packet | | |
77 | | 0xAA | 0xAA |0x03 (UI)|0x00-00-F8| | | | |
44d7a8cf | 78 | `---------------------------------------------------- |
b453872c JG |
79 | Total: 8 non-data bytes |
80 | ||
b453872c JG |
81 | 802.3 Ethernet Data Frame |
82 | ||
83 | ,-----------------------------------------. | |
84 | Bytes | 6 | 6 | 2 | Variable | 4 | | |
85 | |-------|-------|------|-----------|------| | |
86 | Desc. | Dest. | Source| Type | IP Packet | fcs | | |
87 | | MAC | MAC | | | | | |
88 | `-----------------------------------------' | |
89 | Total: 18 non-data bytes | |
90 | ||
91 | In the event that fragmentation is required, the incoming payload is split into | |
92 | N parts of size ieee->fts. The first fragment contains the SNAP header and the | |
93 | remaining packets are just data. | |
94 | ||
95 | If encryption is enabled, each fragment payload size is reduced by enough space | |
96 | to add the prefix and postfix (IV and ICV totalling 8 bytes in the case of WEP) | |
97 | So if you have 1500 bytes of payload with ieee->fts set to 500 without | |
98 | encryption it will take 3 frames. With WEP it will take 4 frames as the | |
99 | payload of each frame is reduced to 492 bytes. | |
100 | ||
101 | * SKB visualization | |
102 | * | |
103 | * ,- skb->data | |
104 | * | | |
105 | * | ETHERNET HEADER ,-<-- PAYLOAD | |
106 | * | | 14 bytes from skb->data | |
107 | * | 2 bytes for Type --> ,T. | (sizeof ethhdr) | |
108 | * | | | | | |
109 | * |,-Dest.--. ,--Src.---. | | | | |
110 | * | 6 bytes| | 6 bytes | | | | | |
111 | * v | | | | | | | |
112 | * 0 | v 1 | v | v 2 | |
113 | * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 | |
114 | * ^ | ^ | ^ | | |
115 | * | | | | | | | |
116 | * | | | | `T' <---- 2 bytes for Type | |
117 | * | | | | | |
118 | * | | '---SNAP--' <-------- 6 bytes for SNAP | |
119 | * | | | |
120 | * `-IV--' <-------------------- 4 bytes for IV (WEP) | |
121 | * | |
122 | * SNAP HEADER | |
123 | * | |
124 | */ | |
125 | ||
126 | static u8 P802_1H_OUI[P80211_OUI_LEN] = { 0x00, 0x00, 0xf8 }; | |
127 | static u8 RFC1042_OUI[P80211_OUI_LEN] = { 0x00, 0x00, 0x00 }; | |
128 | ||
858119e1 | 129 | static int ieee80211_copy_snap(u8 * data, u16 h_proto) |
b453872c JG |
130 | { |
131 | struct ieee80211_snap_hdr *snap; | |
132 | u8 *oui; | |
133 | ||
134 | snap = (struct ieee80211_snap_hdr *)data; | |
135 | snap->dsap = 0xaa; | |
136 | snap->ssap = 0xaa; | |
137 | snap->ctrl = 0x03; | |
138 | ||
139 | if (h_proto == 0x8137 || h_proto == 0x80f3) | |
140 | oui = P802_1H_OUI; | |
141 | else | |
142 | oui = RFC1042_OUI; | |
143 | snap->oui[0] = oui[0]; | |
144 | snap->oui[1] = oui[1]; | |
145 | snap->oui[2] = oui[2]; | |
146 | ||
0edd5b44 | 147 | *(u16 *) (data + SNAP_SIZE) = htons(h_proto); |
b453872c JG |
148 | |
149 | return SNAP_SIZE + sizeof(u16); | |
150 | } | |
151 | ||
858119e1 | 152 | static int ieee80211_encrypt_fragment(struct ieee80211_device *ieee, |
0edd5b44 | 153 | struct sk_buff *frag, int hdr_len) |
b453872c | 154 | { |
0edd5b44 | 155 | struct ieee80211_crypt_data *crypt = ieee->crypt[ieee->tx_keyidx]; |
b453872c JG |
156 | int res; |
157 | ||
f0f15ab5 HL |
158 | if (crypt == NULL) |
159 | return -1; | |
160 | ||
b453872c JG |
161 | /* To encrypt, frame format is: |
162 | * IV (4 bytes), clear payload (including SNAP), ICV (4 bytes) */ | |
b453872c JG |
163 | atomic_inc(&crypt->refcnt); |
164 | res = 0; | |
f0f15ab5 | 165 | if (crypt->ops && crypt->ops->encrypt_mpdu) |
b453872c JG |
166 | res = crypt->ops->encrypt_mpdu(frag, hdr_len, crypt->priv); |
167 | ||
168 | atomic_dec(&crypt->refcnt); | |
169 | if (res < 0) { | |
170 | printk(KERN_INFO "%s: Encryption failed: len=%d.\n", | |
171 | ieee->dev->name, frag->len); | |
172 | ieee->ieee_stats.tx_discards++; | |
173 | return -1; | |
174 | } | |
175 | ||
176 | return 0; | |
177 | } | |
178 | ||
0edd5b44 JG |
179 | void ieee80211_txb_free(struct ieee80211_txb *txb) |
180 | { | |
b453872c JG |
181 | int i; |
182 | if (unlikely(!txb)) | |
183 | return; | |
184 | for (i = 0; i < txb->nr_frags; i++) | |
185 | if (txb->fragments[i]) | |
186 | dev_kfree_skb_any(txb->fragments[i]); | |
187 | kfree(txb); | |
188 | } | |
189 | ||
e157249d | 190 | static struct ieee80211_txb *ieee80211_alloc_txb(int nr_frags, int txb_size, |
d3f7bf4f | 191 | int headroom, gfp_t gfp_mask) |
b453872c JG |
192 | { |
193 | struct ieee80211_txb *txb; | |
194 | int i; | |
0edd5b44 JG |
195 | txb = kmalloc(sizeof(struct ieee80211_txb) + (sizeof(u8 *) * nr_frags), |
196 | gfp_mask); | |
b453872c JG |
197 | if (!txb) |
198 | return NULL; | |
199 | ||
0a989b24 | 200 | memset(txb, 0, sizeof(struct ieee80211_txb)); |
b453872c JG |
201 | txb->nr_frags = nr_frags; |
202 | txb->frag_size = txb_size; | |
203 | ||
204 | for (i = 0; i < nr_frags; i++) { | |
d3f7bf4f MB |
205 | txb->fragments[i] = __dev_alloc_skb(txb_size + headroom, |
206 | gfp_mask); | |
b453872c JG |
207 | if (unlikely(!txb->fragments[i])) { |
208 | i--; | |
209 | break; | |
210 | } | |
d3f7bf4f | 211 | skb_reserve(txb->fragments[i], headroom); |
b453872c JG |
212 | } |
213 | if (unlikely(i != nr_frags)) { | |
214 | while (i >= 0) | |
215 | dev_kfree_skb_any(txb->fragments[i--]); | |
216 | kfree(txb); | |
217 | return NULL; | |
218 | } | |
219 | return txb; | |
220 | } | |
221 | ||
73858062 ZY |
222 | static int ieee80211_classify(struct sk_buff *skb) |
223 | { | |
224 | struct ethhdr *eth; | |
225 | struct iphdr *ip; | |
226 | ||
227 | eth = (struct ethhdr *)skb->data; | |
228 | if (eth->h_proto != __constant_htons(ETH_P_IP)) | |
229 | return 0; | |
230 | ||
231 | ip = skb->nh.iph; | |
232 | switch (ip->tos & 0xfc) { | |
233 | case 0x20: | |
234 | return 2; | |
235 | case 0x40: | |
236 | return 1; | |
237 | case 0x60: | |
238 | return 3; | |
239 | case 0x80: | |
240 | return 4; | |
241 | case 0xa0: | |
242 | return 5; | |
243 | case 0xc0: | |
244 | return 6; | |
245 | case 0xe0: | |
246 | return 7; | |
247 | default: | |
248 | return 0; | |
249 | } | |
250 | } | |
251 | ||
1264fc04 | 252 | /* Incoming skb is converted to a txb which consists of |
3cdd00c5 | 253 | * a block of 802.11 fragment packets (stored as skbs) */ |
0edd5b44 | 254 | int ieee80211_xmit(struct sk_buff *skb, struct net_device *dev) |
b453872c JG |
255 | { |
256 | struct ieee80211_device *ieee = netdev_priv(dev); | |
257 | struct ieee80211_txb *txb = NULL; | |
73858062 | 258 | struct ieee80211_hdr_3addrqos *frag_hdr; |
3cdd00c5 JK |
259 | int i, bytes_per_frag, nr_frags, bytes_last_frag, frag_size, |
260 | rts_required; | |
b453872c JG |
261 | unsigned long flags; |
262 | struct net_device_stats *stats = &ieee->stats; | |
31b59eae | 263 | int ether_type, encrypt, host_encrypt, host_encrypt_msdu, host_build_iv; |
b453872c JG |
264 | int bytes, fc, hdr_len; |
265 | struct sk_buff *skb_frag; | |
73858062 | 266 | struct ieee80211_hdr_3addrqos header = {/* Ensure zero initialized */ |
b453872c | 267 | .duration_id = 0, |
73858062 ZY |
268 | .seq_ctl = 0, |
269 | .qos_ctl = 0 | |
b453872c JG |
270 | }; |
271 | u8 dest[ETH_ALEN], src[ETH_ALEN]; | |
0edd5b44 | 272 | struct ieee80211_crypt_data *crypt; |
2c0aa2a5 | 273 | int priority = skb->priority; |
1264fc04 | 274 | int snapped = 0; |
b453872c | 275 | |
2c0aa2a5 JK |
276 | if (ieee->is_queue_full && (*ieee->is_queue_full) (dev, priority)) |
277 | return NETDEV_TX_BUSY; | |
278 | ||
b453872c JG |
279 | spin_lock_irqsave(&ieee->lock, flags); |
280 | ||
281 | /* If there is no driver handler to take the TXB, dont' bother | |
282 | * creating it... */ | |
283 | if (!ieee->hard_start_xmit) { | |
0edd5b44 | 284 | printk(KERN_WARNING "%s: No xmit handler.\n", ieee->dev->name); |
b453872c JG |
285 | goto success; |
286 | } | |
287 | ||
288 | if (unlikely(skb->len < SNAP_SIZE + sizeof(u16))) { | |
289 | printk(KERN_WARNING "%s: skb too small (%d).\n", | |
290 | ieee->dev->name, skb->len); | |
291 | goto success; | |
292 | } | |
293 | ||
294 | ether_type = ntohs(((struct ethhdr *)skb->data)->h_proto); | |
295 | ||
296 | crypt = ieee->crypt[ieee->tx_keyidx]; | |
297 | ||
298 | encrypt = !(ether_type == ETH_P_PAE && ieee->ieee802_1x) && | |
f1bf6638 | 299 | ieee->sec.encrypt; |
31b59eae | 300 | |
f0f15ab5 HL |
301 | host_encrypt = ieee->host_encrypt && encrypt && crypt; |
302 | host_encrypt_msdu = ieee->host_encrypt_msdu && encrypt && crypt; | |
303 | host_build_iv = ieee->host_build_iv && encrypt && crypt; | |
b453872c JG |
304 | |
305 | if (!encrypt && ieee->ieee802_1x && | |
306 | ieee->drop_unencrypted && ether_type != ETH_P_PAE) { | |
307 | stats->tx_dropped++; | |
308 | goto success; | |
309 | } | |
310 | ||
b453872c | 311 | /* Save source and destination addresses */ |
18294d87 JK |
312 | memcpy(dest, skb->data, ETH_ALEN); |
313 | memcpy(src, skb->data + ETH_ALEN, ETH_ALEN); | |
b453872c | 314 | |
a4bf26f3 | 315 | if (host_encrypt || host_build_iv) |
b453872c | 316 | fc = IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA | |
0edd5b44 | 317 | IEEE80211_FCTL_PROTECTED; |
b453872c JG |
318 | else |
319 | fc = IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA; | |
320 | ||
321 | if (ieee->iw_mode == IW_MODE_INFRA) { | |
322 | fc |= IEEE80211_FCTL_TODS; | |
1264fc04 | 323 | /* To DS: Addr1 = BSSID, Addr2 = SA, Addr3 = DA */ |
18294d87 JK |
324 | memcpy(header.addr1, ieee->bssid, ETH_ALEN); |
325 | memcpy(header.addr2, src, ETH_ALEN); | |
326 | memcpy(header.addr3, dest, ETH_ALEN); | |
b453872c | 327 | } else if (ieee->iw_mode == IW_MODE_ADHOC) { |
1264fc04 | 328 | /* not From/To DS: Addr1 = DA, Addr2 = SA, Addr3 = BSSID */ |
18294d87 JK |
329 | memcpy(header.addr1, dest, ETH_ALEN); |
330 | memcpy(header.addr2, src, ETH_ALEN); | |
331 | memcpy(header.addr3, ieee->bssid, ETH_ALEN); | |
b453872c | 332 | } |
b453872c JG |
333 | hdr_len = IEEE80211_3ADDR_LEN; |
334 | ||
73858062 ZY |
335 | if (ieee->is_qos_active && ieee->is_qos_active(dev, skb)) { |
336 | fc |= IEEE80211_STYPE_QOS_DATA; | |
337 | hdr_len += 2; | |
338 | ||
339 | skb->priority = ieee80211_classify(skb); | |
340 | header.qos_ctl |= skb->priority & IEEE80211_QCTL_TID; | |
341 | } | |
342 | header.frame_ctl = cpu_to_le16(fc); | |
343 | ||
344 | /* Advance the SKB to the start of the payload */ | |
345 | skb_pull(skb, sizeof(struct ethhdr)); | |
346 | ||
347 | /* Determine total amount of storage required for TXB packets */ | |
348 | bytes = skb->len + SNAP_SIZE + sizeof(u16); | |
349 | ||
1264fc04 JK |
350 | /* Encrypt msdu first on the whole data packet. */ |
351 | if ((host_encrypt || host_encrypt_msdu) && | |
352 | crypt && crypt->ops && crypt->ops->encrypt_msdu) { | |
353 | int res = 0; | |
354 | int len = bytes + hdr_len + crypt->ops->extra_msdu_prefix_len + | |
355 | crypt->ops->extra_msdu_postfix_len; | |
356 | struct sk_buff *skb_new = dev_alloc_skb(len); | |
31b59eae | 357 | |
1264fc04 JK |
358 | if (unlikely(!skb_new)) |
359 | goto failed; | |
31b59eae | 360 | |
1264fc04 JK |
361 | skb_reserve(skb_new, crypt->ops->extra_msdu_prefix_len); |
362 | memcpy(skb_put(skb_new, hdr_len), &header, hdr_len); | |
363 | snapped = 1; | |
364 | ieee80211_copy_snap(skb_put(skb_new, SNAP_SIZE + sizeof(u16)), | |
365 | ether_type); | |
366 | memcpy(skb_put(skb_new, skb->len), skb->data, skb->len); | |
367 | res = crypt->ops->encrypt_msdu(skb_new, hdr_len, crypt->priv); | |
368 | if (res < 0) { | |
369 | IEEE80211_ERROR("msdu encryption failed\n"); | |
370 | dev_kfree_skb_any(skb_new); | |
371 | goto failed; | |
372 | } | |
373 | dev_kfree_skb_any(skb); | |
374 | skb = skb_new; | |
375 | bytes += crypt->ops->extra_msdu_prefix_len + | |
376 | crypt->ops->extra_msdu_postfix_len; | |
377 | skb_pull(skb, hdr_len); | |
378 | } | |
379 | ||
380 | if (host_encrypt || ieee->host_open_frag) { | |
381 | /* Determine fragmentation size based on destination (multicast | |
382 | * and broadcast are not fragmented) */ | |
5b74eda7 HL |
383 | if (is_multicast_ether_addr(dest) || |
384 | is_broadcast_ether_addr(dest)) | |
1264fc04 JK |
385 | frag_size = MAX_FRAG_THRESHOLD; |
386 | else | |
387 | frag_size = ieee->fts; | |
388 | ||
389 | /* Determine amount of payload per fragment. Regardless of if | |
390 | * this stack is providing the full 802.11 header, one will | |
391 | * eventually be affixed to this fragment -- so we must account | |
392 | * for it when determining the amount of payload space. */ | |
393 | bytes_per_frag = frag_size - IEEE80211_3ADDR_LEN; | |
394 | if (ieee->config & | |
395 | (CFG_IEEE80211_COMPUTE_FCS | CFG_IEEE80211_RESERVE_FCS)) | |
396 | bytes_per_frag -= IEEE80211_FCS_LEN; | |
397 | ||
398 | /* Each fragment may need to have room for encryptiong | |
399 | * pre/postfix */ | |
400 | if (host_encrypt) | |
401 | bytes_per_frag -= crypt->ops->extra_mpdu_prefix_len + | |
402 | crypt->ops->extra_mpdu_postfix_len; | |
403 | ||
404 | /* Number of fragments is the total | |
405 | * bytes_per_frag / payload_per_fragment */ | |
406 | nr_frags = bytes / bytes_per_frag; | |
407 | bytes_last_frag = bytes % bytes_per_frag; | |
408 | if (bytes_last_frag) | |
409 | nr_frags++; | |
410 | else | |
411 | bytes_last_frag = bytes_per_frag; | |
412 | } else { | |
413 | nr_frags = 1; | |
414 | bytes_per_frag = bytes_last_frag = bytes; | |
415 | frag_size = bytes + IEEE80211_3ADDR_LEN; | |
416 | } | |
b453872c | 417 | |
3cdd00c5 JK |
418 | rts_required = (frag_size > ieee->rts |
419 | && ieee->config & CFG_IEEE80211_RTS); | |
420 | if (rts_required) | |
421 | nr_frags++; | |
3cdd00c5 | 422 | |
b453872c JG |
423 | /* When we allocate the TXB we allocate enough space for the reserve |
424 | * and full fragment bytes (bytes_per_frag doesn't include prefix, | |
425 | * postfix, header, FCS, etc.) */ | |
d3f7bf4f MB |
426 | txb = ieee80211_alloc_txb(nr_frags, frag_size, |
427 | ieee->tx_headroom, GFP_ATOMIC); | |
b453872c JG |
428 | if (unlikely(!txb)) { |
429 | printk(KERN_WARNING "%s: Could not allocate TXB\n", | |
430 | ieee->dev->name); | |
431 | goto failed; | |
432 | } | |
433 | txb->encrypted = encrypt; | |
1264fc04 JK |
434 | if (host_encrypt) |
435 | txb->payload_size = frag_size * (nr_frags - 1) + | |
436 | bytes_last_frag; | |
437 | else | |
438 | txb->payload_size = bytes; | |
b453872c | 439 | |
3cdd00c5 JK |
440 | if (rts_required) { |
441 | skb_frag = txb->fragments[0]; | |
442 | frag_hdr = | |
73858062 | 443 | (struct ieee80211_hdr_3addrqos *)skb_put(skb_frag, hdr_len); |
3cdd00c5 JK |
444 | |
445 | /* | |
446 | * Set header frame_ctl to the RTS. | |
447 | */ | |
448 | header.frame_ctl = | |
449 | cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS); | |
450 | memcpy(frag_hdr, &header, hdr_len); | |
451 | ||
452 | /* | |
453 | * Restore header frame_ctl to the original data setting. | |
454 | */ | |
455 | header.frame_ctl = cpu_to_le16(fc); | |
456 | ||
457 | if (ieee->config & | |
458 | (CFG_IEEE80211_COMPUTE_FCS | CFG_IEEE80211_RESERVE_FCS)) | |
459 | skb_put(skb_frag, 4); | |
460 | ||
461 | txb->rts_included = 1; | |
462 | i = 1; | |
463 | } else | |
464 | i = 0; | |
465 | ||
466 | for (; i < nr_frags; i++) { | |
b453872c JG |
467 | skb_frag = txb->fragments[i]; |
468 | ||
31b59eae | 469 | if (host_encrypt || host_build_iv) |
1264fc04 JK |
470 | skb_reserve(skb_frag, |
471 | crypt->ops->extra_mpdu_prefix_len); | |
b453872c | 472 | |
ee34af37 | 473 | frag_hdr = |
73858062 | 474 | (struct ieee80211_hdr_3addrqos *)skb_put(skb_frag, hdr_len); |
b453872c JG |
475 | memcpy(frag_hdr, &header, hdr_len); |
476 | ||
477 | /* If this is not the last fragment, then add the MOREFRAGS | |
478 | * bit to the frame control */ | |
479 | if (i != nr_frags - 1) { | |
0edd5b44 JG |
480 | frag_hdr->frame_ctl = |
481 | cpu_to_le16(fc | IEEE80211_FCTL_MOREFRAGS); | |
b453872c JG |
482 | bytes = bytes_per_frag; |
483 | } else { | |
484 | /* The last fragment takes the remaining length */ | |
485 | bytes = bytes_last_frag; | |
486 | } | |
487 | ||
1264fc04 JK |
488 | if (i == 0 && !snapped) { |
489 | ieee80211_copy_snap(skb_put | |
490 | (skb_frag, SNAP_SIZE + sizeof(u16)), | |
491 | ether_type); | |
b453872c JG |
492 | bytes -= SNAP_SIZE + sizeof(u16); |
493 | } | |
494 | ||
495 | memcpy(skb_put(skb_frag, bytes), skb->data, bytes); | |
496 | ||
497 | /* Advance the SKB... */ | |
498 | skb_pull(skb, bytes); | |
499 | ||
500 | /* Encryption routine will move the header forward in order | |
501 | * to insert the IV between the header and the payload */ | |
f1bf6638 | 502 | if (host_encrypt) |
b453872c | 503 | ieee80211_encrypt_fragment(ieee, skb_frag, hdr_len); |
31b59eae JK |
504 | else if (host_build_iv) { |
505 | struct ieee80211_crypt_data *crypt; | |
506 | ||
507 | crypt = ieee->crypt[ieee->tx_keyidx]; | |
508 | atomic_inc(&crypt->refcnt); | |
509 | if (crypt->ops->build_iv) | |
510 | crypt->ops->build_iv(skb_frag, hdr_len, | |
9184d934 ZY |
511 | ieee->sec.keys[ieee->sec.active_key], |
512 | ieee->sec.key_sizes[ieee->sec.active_key], | |
513 | crypt->priv); | |
31b59eae JK |
514 | atomic_dec(&crypt->refcnt); |
515 | } | |
f1bf6638 | 516 | |
b453872c JG |
517 | if (ieee->config & |
518 | (CFG_IEEE80211_COMPUTE_FCS | CFG_IEEE80211_RESERVE_FCS)) | |
519 | skb_put(skb_frag, 4); | |
520 | } | |
521 | ||
0edd5b44 | 522 | success: |
b453872c JG |
523 | spin_unlock_irqrestore(&ieee->lock, flags); |
524 | ||
525 | dev_kfree_skb_any(skb); | |
526 | ||
527 | if (txb) { | |
9e8571af | 528 | int ret = (*ieee->hard_start_xmit) (txb, dev, priority); |
1264fc04 | 529 | if (ret == 0) { |
b453872c JG |
530 | stats->tx_packets++; |
531 | stats->tx_bytes += txb->payload_size; | |
532 | return 0; | |
533 | } | |
2c0aa2a5 JK |
534 | |
535 | if (ret == NETDEV_TX_BUSY) { | |
536 | printk(KERN_ERR "%s: NETDEV_TX_BUSY returned; " | |
537 | "driver should report queue full via " | |
538 | "ieee_device->is_queue_full.\n", | |
539 | ieee->dev->name); | |
540 | } | |
541 | ||
b453872c JG |
542 | ieee80211_txb_free(txb); |
543 | } | |
544 | ||
545 | return 0; | |
546 | ||
0edd5b44 | 547 | failed: |
b453872c JG |
548 | spin_unlock_irqrestore(&ieee->lock, flags); |
549 | netif_stop_queue(dev); | |
550 | stats->tx_errors++; | |
551 | return 1; | |
3f552bbf JK |
552 | } |
553 | ||
554 | /* Incoming 802.11 strucure is converted to a TXB | |
555 | * a block of 802.11 fragment packets (stored as skbs) */ | |
556 | int ieee80211_tx_frame(struct ieee80211_device *ieee, | |
76ea4c7f DD |
557 | struct ieee80211_hdr *frame, int hdr_len, int total_len, |
558 | int encrypt_mpdu) | |
3f552bbf JK |
559 | { |
560 | struct ieee80211_txb *txb = NULL; | |
561 | unsigned long flags; | |
562 | struct net_device_stats *stats = &ieee->stats; | |
563 | struct sk_buff *skb_frag; | |
9e8571af | 564 | int priority = -1; |
4b301536 HL |
565 | int fraglen = total_len; |
566 | int headroom = ieee->tx_headroom; | |
567 | struct ieee80211_crypt_data *crypt = ieee->crypt[ieee->tx_keyidx]; | |
3f552bbf JK |
568 | |
569 | spin_lock_irqsave(&ieee->lock, flags); | |
570 | ||
4b301536 | 571 | if (encrypt_mpdu && (!ieee->sec.encrypt || !crypt)) |
76ea4c7f DD |
572 | encrypt_mpdu = 0; |
573 | ||
3f552bbf JK |
574 | /* If there is no driver handler to take the TXB, dont' bother |
575 | * creating it... */ | |
576 | if (!ieee->hard_start_xmit) { | |
577 | printk(KERN_WARNING "%s: No xmit handler.\n", ieee->dev->name); | |
578 | goto success; | |
579 | } | |
b453872c | 580 | |
76ea4c7f | 581 | if (unlikely(total_len < 24)) { |
3f552bbf | 582 | printk(KERN_WARNING "%s: skb too small (%d).\n", |
76ea4c7f | 583 | ieee->dev->name, total_len); |
3f552bbf JK |
584 | goto success; |
585 | } | |
586 | ||
4b301536 | 587 | if (encrypt_mpdu) { |
76ea4c7f | 588 | frame->frame_ctl |= cpu_to_le16(IEEE80211_FCTL_PROTECTED); |
4b301536 HL |
589 | fraglen += crypt->ops->extra_mpdu_prefix_len + |
590 | crypt->ops->extra_mpdu_postfix_len; | |
591 | headroom += crypt->ops->extra_mpdu_prefix_len; | |
592 | } | |
76ea4c7f | 593 | |
3f552bbf JK |
594 | /* When we allocate the TXB we allocate enough space for the reserve |
595 | * and full fragment bytes (bytes_per_frag doesn't include prefix, | |
596 | * postfix, header, FCS, etc.) */ | |
4b301536 | 597 | txb = ieee80211_alloc_txb(1, fraglen, headroom, GFP_ATOMIC); |
3f552bbf JK |
598 | if (unlikely(!txb)) { |
599 | printk(KERN_WARNING "%s: Could not allocate TXB\n", | |
600 | ieee->dev->name); | |
601 | goto failed; | |
602 | } | |
603 | txb->encrypted = 0; | |
4b301536 | 604 | txb->payload_size = fraglen; |
3f552bbf JK |
605 | |
606 | skb_frag = txb->fragments[0]; | |
607 | ||
76ea4c7f | 608 | memcpy(skb_put(skb_frag, total_len), frame, total_len); |
3f552bbf JK |
609 | |
610 | if (ieee->config & | |
611 | (CFG_IEEE80211_COMPUTE_FCS | CFG_IEEE80211_RESERVE_FCS)) | |
612 | skb_put(skb_frag, 4); | |
613 | ||
76ea4c7f DD |
614 | /* To avoid overcomplicating things, we do the corner-case frame |
615 | * encryption in software. The only real situation where encryption is | |
616 | * needed here is during software-based shared key authentication. */ | |
617 | if (encrypt_mpdu) | |
618 | ieee80211_encrypt_fragment(ieee, skb_frag, hdr_len); | |
619 | ||
3f552bbf JK |
620 | success: |
621 | spin_unlock_irqrestore(&ieee->lock, flags); | |
622 | ||
623 | if (txb) { | |
9e8571af | 624 | if ((*ieee->hard_start_xmit) (txb, ieee->dev, priority) == 0) { |
3f552bbf JK |
625 | stats->tx_packets++; |
626 | stats->tx_bytes += txb->payload_size; | |
627 | return 0; | |
628 | } | |
629 | ieee80211_txb_free(txb); | |
630 | } | |
631 | return 0; | |
632 | ||
633 | failed: | |
634 | spin_unlock_irqrestore(&ieee->lock, flags); | |
635 | stats->tx_errors++; | |
636 | return 1; | |
b453872c JG |
637 | } |
638 | ||
3f552bbf | 639 | EXPORT_SYMBOL(ieee80211_tx_frame); |
b453872c | 640 | EXPORT_SYMBOL(ieee80211_txb_free); |