Commit | Line | Data |
---|---|---|
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 | ||
b0a4e7d8 | 44 | #include "libipw.h" |
b453872c | 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 `----.----' | |
64265651 | 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 | `-----| |-----' | |
64265651 YH |
67 | `-----.-----' |
68 | | | |
44d7a8cf | 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 | ||
b0a4e7d8 | 129 | static int libipw_copy_snap(u8 * data, __be16 h_proto) |
b453872c | 130 | { |
b0a4e7d8 | 131 | struct libipw_snap_hdr *snap; |
b453872c JG |
132 | u8 *oui; |
133 | ||
b0a4e7d8 | 134 | snap = (struct libipw_snap_hdr *)data; |
b453872c JG |
135 | snap->dsap = 0xaa; |
136 | snap->ssap = 0xaa; | |
137 | snap->ctrl = 0x03; | |
138 | ||
d9e94d56 | 139 | if (h_proto == htons(ETH_P_AARP) || h_proto == htons(ETH_P_IPX)) |
b453872c JG |
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 | ||
01e1f045 | 147 | memcpy(data + SNAP_SIZE, &h_proto, sizeof(u16)); |
b453872c JG |
148 | |
149 | return SNAP_SIZE + sizeof(u16); | |
150 | } | |
151 | ||
b0a4e7d8 | 152 | static int libipw_encrypt_fragment(struct libipw_device *ieee, |
0edd5b44 | 153 | struct sk_buff *frag, int hdr_len) |
b453872c | 154 | { |
274bfb8d JL |
155 | struct lib80211_crypt_data *crypt = |
156 | ieee->crypt_info.crypt[ieee->crypt_info.tx_keyidx]; | |
b453872c JG |
157 | int res; |
158 | ||
f0f15ab5 HL |
159 | if (crypt == NULL) |
160 | return -1; | |
161 | ||
b453872c JG |
162 | /* To encrypt, frame format is: |
163 | * IV (4 bytes), clear payload (including SNAP), ICV (4 bytes) */ | |
b453872c JG |
164 | atomic_inc(&crypt->refcnt); |
165 | res = 0; | |
f0f15ab5 | 166 | if (crypt->ops && crypt->ops->encrypt_mpdu) |
b453872c JG |
167 | res = crypt->ops->encrypt_mpdu(frag, hdr_len, crypt->priv); |
168 | ||
169 | atomic_dec(&crypt->refcnt); | |
170 | if (res < 0) { | |
171 | printk(KERN_INFO "%s: Encryption failed: len=%d.\n", | |
172 | ieee->dev->name, frag->len); | |
173 | ieee->ieee_stats.tx_discards++; | |
174 | return -1; | |
175 | } | |
176 | ||
177 | return 0; | |
178 | } | |
179 | ||
b0a4e7d8 | 180 | void libipw_txb_free(struct libipw_txb *txb) |
0edd5b44 | 181 | { |
b453872c JG |
182 | int i; |
183 | if (unlikely(!txb)) | |
184 | return; | |
185 | for (i = 0; i < txb->nr_frags; i++) | |
186 | if (txb->fragments[i]) | |
187 | dev_kfree_skb_any(txb->fragments[i]); | |
188 | kfree(txb); | |
189 | } | |
190 | ||
b0a4e7d8 | 191 | static struct libipw_txb *libipw_alloc_txb(int nr_frags, int txb_size, |
d3f7bf4f | 192 | int headroom, gfp_t gfp_mask) |
b453872c | 193 | { |
b0a4e7d8 | 194 | struct libipw_txb *txb; |
b453872c | 195 | int i; |
b0a4e7d8 | 196 | txb = kmalloc(sizeof(struct libipw_txb) + (sizeof(u8 *) * nr_frags), |
0edd5b44 | 197 | gfp_mask); |
b453872c JG |
198 | if (!txb) |
199 | return NULL; | |
200 | ||
b0a4e7d8 | 201 | memset(txb, 0, sizeof(struct libipw_txb)); |
b453872c JG |
202 | txb->nr_frags = nr_frags; |
203 | txb->frag_size = txb_size; | |
204 | ||
205 | for (i = 0; i < nr_frags; i++) { | |
d3f7bf4f MB |
206 | txb->fragments[i] = __dev_alloc_skb(txb_size + headroom, |
207 | gfp_mask); | |
b453872c JG |
208 | if (unlikely(!txb->fragments[i])) { |
209 | i--; | |
210 | break; | |
211 | } | |
d3f7bf4f | 212 | skb_reserve(txb->fragments[i], headroom); |
b453872c JG |
213 | } |
214 | if (unlikely(i != nr_frags)) { | |
215 | while (i >= 0) | |
216 | dev_kfree_skb_any(txb->fragments[i--]); | |
217 | kfree(txb); | |
218 | return NULL; | |
219 | } | |
220 | return txb; | |
221 | } | |
222 | ||
b0a4e7d8 | 223 | static int libipw_classify(struct sk_buff *skb) |
73858062 ZY |
224 | { |
225 | struct ethhdr *eth; | |
226 | struct iphdr *ip; | |
227 | ||
228 | eth = (struct ethhdr *)skb->data; | |
1c9e8ef7 | 229 | if (eth->h_proto != htons(ETH_P_IP)) |
73858062 ZY |
230 | return 0; |
231 | ||
eddc9ec5 | 232 | ip = ip_hdr(skb); |
73858062 ZY |
233 | switch (ip->tos & 0xfc) { |
234 | case 0x20: | |
235 | return 2; | |
236 | case 0x40: | |
237 | return 1; | |
238 | case 0x60: | |
239 | return 3; | |
240 | case 0x80: | |
241 | return 4; | |
242 | case 0xa0: | |
243 | return 5; | |
244 | case 0xc0: | |
245 | return 6; | |
246 | case 0xe0: | |
247 | return 7; | |
248 | default: | |
249 | return 0; | |
250 | } | |
251 | } | |
252 | ||
1264fc04 | 253 | /* Incoming skb is converted to a txb which consists of |
3cdd00c5 | 254 | * a block of 802.11 fragment packets (stored as skbs) */ |
b0a4e7d8 | 255 | int libipw_xmit(struct sk_buff *skb, struct net_device *dev) |
b453872c | 256 | { |
b0a4e7d8 JL |
257 | struct libipw_device *ieee = netdev_priv(dev); |
258 | struct libipw_txb *txb = NULL; | |
259 | struct libipw_hdr_3addrqos *frag_hdr; | |
3cdd00c5 JK |
260 | int i, bytes_per_frag, nr_frags, bytes_last_frag, frag_size, |
261 | rts_required; | |
b453872c | 262 | unsigned long flags; |
d9e94d56 AV |
263 | int encrypt, host_encrypt, host_encrypt_msdu, host_build_iv; |
264 | __be16 ether_type; | |
b453872c JG |
265 | int bytes, fc, hdr_len; |
266 | struct sk_buff *skb_frag; | |
b0a4e7d8 | 267 | struct libipw_hdr_3addrqos header = {/* Ensure zero initialized */ |
b453872c | 268 | .duration_id = 0, |
73858062 ZY |
269 | .seq_ctl = 0, |
270 | .qos_ctl = 0 | |
b453872c JG |
271 | }; |
272 | u8 dest[ETH_ALEN], src[ETH_ALEN]; | |
274bfb8d | 273 | struct lib80211_crypt_data *crypt; |
2c0aa2a5 | 274 | int priority = skb->priority; |
1264fc04 | 275 | int snapped = 0; |
b453872c | 276 | |
2c0aa2a5 JK |
277 | if (ieee->is_queue_full && (*ieee->is_queue_full) (dev, priority)) |
278 | return NETDEV_TX_BUSY; | |
279 | ||
b453872c JG |
280 | spin_lock_irqsave(&ieee->lock, flags); |
281 | ||
282 | /* If there is no driver handler to take the TXB, dont' bother | |
283 | * creating it... */ | |
284 | if (!ieee->hard_start_xmit) { | |
0edd5b44 | 285 | printk(KERN_WARNING "%s: No xmit handler.\n", ieee->dev->name); |
b453872c JG |
286 | goto success; |
287 | } | |
288 | ||
289 | if (unlikely(skb->len < SNAP_SIZE + sizeof(u16))) { | |
290 | printk(KERN_WARNING "%s: skb too small (%d).\n", | |
291 | ieee->dev->name, skb->len); | |
292 | goto success; | |
293 | } | |
294 | ||
d9e94d56 | 295 | ether_type = ((struct ethhdr *)skb->data)->h_proto; |
b453872c | 296 | |
274bfb8d | 297 | crypt = ieee->crypt_info.crypt[ieee->crypt_info.tx_keyidx]; |
b453872c | 298 | |
d9e94d56 | 299 | encrypt = !(ether_type == htons(ETH_P_PAE) && ieee->ieee802_1x) && |
f1bf6638 | 300 | ieee->sec.encrypt; |
31b59eae | 301 | |
f0f15ab5 HL |
302 | host_encrypt = ieee->host_encrypt && encrypt && crypt; |
303 | host_encrypt_msdu = ieee->host_encrypt_msdu && encrypt && crypt; | |
304 | host_build_iv = ieee->host_build_iv && encrypt && crypt; | |
b453872c JG |
305 | |
306 | if (!encrypt && ieee->ieee802_1x && | |
d9e94d56 | 307 | ieee->drop_unencrypted && ether_type != htons(ETH_P_PAE)) { |
ce55cbaf | 308 | dev->stats.tx_dropped++; |
b453872c JG |
309 | goto success; |
310 | } | |
311 | ||
b453872c | 312 | /* Save source and destination addresses */ |
d626f62b ACM |
313 | skb_copy_from_linear_data(skb, dest, ETH_ALEN); |
314 | skb_copy_from_linear_data_offset(skb, ETH_ALEN, src, ETH_ALEN); | |
b453872c | 315 | |
a4bf26f3 | 316 | if (host_encrypt || host_build_iv) |
b453872c | 317 | fc = IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA | |
0edd5b44 | 318 | IEEE80211_FCTL_PROTECTED; |
b453872c JG |
319 | else |
320 | fc = IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA; | |
321 | ||
322 | if (ieee->iw_mode == IW_MODE_INFRA) { | |
323 | fc |= IEEE80211_FCTL_TODS; | |
1264fc04 | 324 | /* To DS: Addr1 = BSSID, Addr2 = SA, Addr3 = DA */ |
18294d87 JK |
325 | memcpy(header.addr1, ieee->bssid, ETH_ALEN); |
326 | memcpy(header.addr2, src, ETH_ALEN); | |
327 | memcpy(header.addr3, dest, ETH_ALEN); | |
b453872c | 328 | } else if (ieee->iw_mode == IW_MODE_ADHOC) { |
1264fc04 | 329 | /* not From/To DS: Addr1 = DA, Addr2 = SA, Addr3 = BSSID */ |
18294d87 JK |
330 | memcpy(header.addr1, dest, ETH_ALEN); |
331 | memcpy(header.addr2, src, ETH_ALEN); | |
332 | memcpy(header.addr3, ieee->bssid, ETH_ALEN); | |
b453872c | 333 | } |
b0a4e7d8 | 334 | hdr_len = LIBIPW_3ADDR_LEN; |
b453872c | 335 | |
73858062 ZY |
336 | if (ieee->is_qos_active && ieee->is_qos_active(dev, skb)) { |
337 | fc |= IEEE80211_STYPE_QOS_DATA; | |
338 | hdr_len += 2; | |
339 | ||
b0a4e7d8 JL |
340 | skb->priority = libipw_classify(skb); |
341 | header.qos_ctl |= cpu_to_le16(skb->priority & LIBIPW_QCTL_TID); | |
73858062 ZY |
342 | } |
343 | header.frame_ctl = cpu_to_le16(fc); | |
344 | ||
345 | /* Advance the SKB to the start of the payload */ | |
346 | skb_pull(skb, sizeof(struct ethhdr)); | |
347 | ||
348 | /* Determine total amount of storage required for TXB packets */ | |
349 | bytes = skb->len + SNAP_SIZE + sizeof(u16); | |
350 | ||
1264fc04 JK |
351 | /* Encrypt msdu first on the whole data packet. */ |
352 | if ((host_encrypt || host_encrypt_msdu) && | |
353 | crypt && crypt->ops && crypt->ops->encrypt_msdu) { | |
354 | int res = 0; | |
355 | int len = bytes + hdr_len + crypt->ops->extra_msdu_prefix_len + | |
356 | crypt->ops->extra_msdu_postfix_len; | |
357 | struct sk_buff *skb_new = dev_alloc_skb(len); | |
31b59eae | 358 | |
1264fc04 JK |
359 | if (unlikely(!skb_new)) |
360 | goto failed; | |
31b59eae | 361 | |
1264fc04 JK |
362 | skb_reserve(skb_new, crypt->ops->extra_msdu_prefix_len); |
363 | memcpy(skb_put(skb_new, hdr_len), &header, hdr_len); | |
364 | snapped = 1; | |
b0a4e7d8 | 365 | libipw_copy_snap(skb_put(skb_new, SNAP_SIZE + sizeof(u16)), |
1264fc04 | 366 | ether_type); |
d626f62b | 367 | skb_copy_from_linear_data(skb, skb_put(skb_new, skb->len), skb->len); |
1264fc04 JK |
368 | res = crypt->ops->encrypt_msdu(skb_new, hdr_len, crypt->priv); |
369 | if (res < 0) { | |
b0a4e7d8 | 370 | LIBIPW_ERROR("msdu encryption failed\n"); |
1264fc04 JK |
371 | dev_kfree_skb_any(skb_new); |
372 | goto failed; | |
373 | } | |
374 | dev_kfree_skb_any(skb); | |
375 | skb = skb_new; | |
376 | bytes += crypt->ops->extra_msdu_prefix_len + | |
377 | crypt->ops->extra_msdu_postfix_len; | |
378 | skb_pull(skb, hdr_len); | |
379 | } | |
380 | ||
381 | if (host_encrypt || ieee->host_open_frag) { | |
382 | /* Determine fragmentation size based on destination (multicast | |
383 | * and broadcast are not fragmented) */ | |
5b74eda7 HL |
384 | if (is_multicast_ether_addr(dest) || |
385 | is_broadcast_ether_addr(dest)) | |
1264fc04 JK |
386 | frag_size = MAX_FRAG_THRESHOLD; |
387 | else | |
388 | frag_size = ieee->fts; | |
389 | ||
390 | /* Determine amount of payload per fragment. Regardless of if | |
391 | * this stack is providing the full 802.11 header, one will | |
392 | * eventually be affixed to this fragment -- so we must account | |
393 | * for it when determining the amount of payload space. */ | |
efa53ebe | 394 | bytes_per_frag = frag_size - hdr_len; |
1264fc04 | 395 | if (ieee->config & |
b0a4e7d8 JL |
396 | (CFG_LIBIPW_COMPUTE_FCS | CFG_LIBIPW_RESERVE_FCS)) |
397 | bytes_per_frag -= LIBIPW_FCS_LEN; | |
1264fc04 JK |
398 | |
399 | /* Each fragment may need to have room for encryptiong | |
400 | * pre/postfix */ | |
401 | if (host_encrypt) | |
402 | bytes_per_frag -= crypt->ops->extra_mpdu_prefix_len + | |
403 | crypt->ops->extra_mpdu_postfix_len; | |
404 | ||
405 | /* Number of fragments is the total | |
406 | * bytes_per_frag / payload_per_fragment */ | |
407 | nr_frags = bytes / bytes_per_frag; | |
408 | bytes_last_frag = bytes % bytes_per_frag; | |
409 | if (bytes_last_frag) | |
410 | nr_frags++; | |
411 | else | |
412 | bytes_last_frag = bytes_per_frag; | |
413 | } else { | |
414 | nr_frags = 1; | |
415 | bytes_per_frag = bytes_last_frag = bytes; | |
efa53ebe | 416 | frag_size = bytes + hdr_len; |
1264fc04 | 417 | } |
b453872c | 418 | |
3cdd00c5 | 419 | rts_required = (frag_size > ieee->rts |
b0a4e7d8 | 420 | && ieee->config & CFG_LIBIPW_RTS); |
3cdd00c5 JK |
421 | if (rts_required) |
422 | nr_frags++; | |
3cdd00c5 | 423 | |
b453872c JG |
424 | /* When we allocate the TXB we allocate enough space for the reserve |
425 | * and full fragment bytes (bytes_per_frag doesn't include prefix, | |
426 | * postfix, header, FCS, etc.) */ | |
b0a4e7d8 | 427 | txb = libipw_alloc_txb(nr_frags, frag_size, |
d3f7bf4f | 428 | ieee->tx_headroom, GFP_ATOMIC); |
b453872c JG |
429 | if (unlikely(!txb)) { |
430 | printk(KERN_WARNING "%s: Could not allocate TXB\n", | |
431 | ieee->dev->name); | |
432 | goto failed; | |
433 | } | |
434 | txb->encrypted = encrypt; | |
1264fc04 JK |
435 | if (host_encrypt) |
436 | txb->payload_size = frag_size * (nr_frags - 1) + | |
437 | bytes_last_frag; | |
438 | else | |
439 | txb->payload_size = bytes; | |
b453872c | 440 | |
3cdd00c5 JK |
441 | if (rts_required) { |
442 | skb_frag = txb->fragments[0]; | |
443 | frag_hdr = | |
b0a4e7d8 | 444 | (struct libipw_hdr_3addrqos *)skb_put(skb_frag, hdr_len); |
3cdd00c5 JK |
445 | |
446 | /* | |
447 | * Set header frame_ctl to the RTS. | |
448 | */ | |
449 | header.frame_ctl = | |
450 | cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS); | |
451 | memcpy(frag_hdr, &header, hdr_len); | |
452 | ||
453 | /* | |
454 | * Restore header frame_ctl to the original data setting. | |
455 | */ | |
456 | header.frame_ctl = cpu_to_le16(fc); | |
457 | ||
458 | if (ieee->config & | |
b0a4e7d8 | 459 | (CFG_LIBIPW_COMPUTE_FCS | CFG_LIBIPW_RESERVE_FCS)) |
3cdd00c5 JK |
460 | skb_put(skb_frag, 4); |
461 | ||
462 | txb->rts_included = 1; | |
463 | i = 1; | |
464 | } else | |
465 | i = 0; | |
466 | ||
467 | for (; i < nr_frags; i++) { | |
b453872c JG |
468 | skb_frag = txb->fragments[i]; |
469 | ||
31b59eae | 470 | if (host_encrypt || host_build_iv) |
1264fc04 JK |
471 | skb_reserve(skb_frag, |
472 | crypt->ops->extra_mpdu_prefix_len); | |
b453872c | 473 | |
ee34af37 | 474 | frag_hdr = |
b0a4e7d8 | 475 | (struct libipw_hdr_3addrqos *)skb_put(skb_frag, hdr_len); |
b453872c JG |
476 | memcpy(frag_hdr, &header, hdr_len); |
477 | ||
478 | /* If this is not the last fragment, then add the MOREFRAGS | |
479 | * bit to the frame control */ | |
480 | if (i != nr_frags - 1) { | |
0edd5b44 JG |
481 | frag_hdr->frame_ctl = |
482 | cpu_to_le16(fc | IEEE80211_FCTL_MOREFRAGS); | |
b453872c JG |
483 | bytes = bytes_per_frag; |
484 | } else { | |
485 | /* The last fragment takes the remaining length */ | |
486 | bytes = bytes_last_frag; | |
487 | } | |
488 | ||
1264fc04 | 489 | if (i == 0 && !snapped) { |
b0a4e7d8 | 490 | libipw_copy_snap(skb_put |
1264fc04 JK |
491 | (skb_frag, SNAP_SIZE + sizeof(u16)), |
492 | ether_type); | |
b453872c JG |
493 | bytes -= SNAP_SIZE + sizeof(u16); |
494 | } | |
495 | ||
d626f62b | 496 | skb_copy_from_linear_data(skb, skb_put(skb_frag, bytes), bytes); |
b453872c JG |
497 | |
498 | /* Advance the SKB... */ | |
499 | skb_pull(skb, bytes); | |
500 | ||
501 | /* Encryption routine will move the header forward in order | |
502 | * to insert the IV between the header and the payload */ | |
f1bf6638 | 503 | if (host_encrypt) |
b0a4e7d8 | 504 | libipw_encrypt_fragment(ieee, skb_frag, hdr_len); |
31b59eae | 505 | else if (host_build_iv) { |
31b59eae JK |
506 | atomic_inc(&crypt->refcnt); |
507 | if (crypt->ops->build_iv) | |
508 | crypt->ops->build_iv(skb_frag, hdr_len, | |
9184d934 ZY |
509 | ieee->sec.keys[ieee->sec.active_key], |
510 | ieee->sec.key_sizes[ieee->sec.active_key], | |
511 | crypt->priv); | |
31b59eae JK |
512 | atomic_dec(&crypt->refcnt); |
513 | } | |
f1bf6638 | 514 | |
b453872c | 515 | if (ieee->config & |
b0a4e7d8 | 516 | (CFG_LIBIPW_COMPUTE_FCS | CFG_LIBIPW_RESERVE_FCS)) |
b453872c JG |
517 | skb_put(skb_frag, 4); |
518 | } | |
519 | ||
0edd5b44 | 520 | success: |
b453872c JG |
521 | spin_unlock_irqrestore(&ieee->lock, flags); |
522 | ||
523 | dev_kfree_skb_any(skb); | |
524 | ||
525 | if (txb) { | |
9e8571af | 526 | int ret = (*ieee->hard_start_xmit) (txb, dev, priority); |
1264fc04 | 527 | if (ret == 0) { |
ce55cbaf SH |
528 | dev->stats.tx_packets++; |
529 | dev->stats.tx_bytes += txb->payload_size; | |
ec634fe3 | 530 | return NETDEV_TX_OK; |
b453872c | 531 | } |
2c0aa2a5 | 532 | |
b0a4e7d8 | 533 | libipw_txb_free(txb); |
b453872c JG |
534 | } |
535 | ||
ec634fe3 | 536 | return NETDEV_TX_OK; |
b453872c | 537 | |
0edd5b44 | 538 | failed: |
b453872c JG |
539 | spin_unlock_irqrestore(&ieee->lock, flags); |
540 | netif_stop_queue(dev); | |
ce55cbaf | 541 | dev->stats.tx_errors++; |
5b548140 | 542 | return NETDEV_TX_BUSY; |
3f552bbf | 543 | } |
b0a4e7d8 | 544 | EXPORT_SYMBOL(libipw_xmit); |
3f552bbf | 545 | |
b0a4e7d8 | 546 | EXPORT_SYMBOL(libipw_txb_free); |