Commit | Line | Data |
---|---|---|
5fad5a2e AB |
1 | #include "hostap_80211.h" |
2 | #include "hostap_common.h" | |
3 | #include "hostap_wlan.h" | |
4 | #include "hostap.h" | |
5 | #include "hostap_ap.h" | |
6 | ||
7 | /* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */ | |
8 | /* Ethernet-II snap header (RFC1042 for most EtherTypes) */ | |
9 | static unsigned char rfc1042_header[] = | |
10 | { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 }; | |
11 | /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */ | |
12 | static unsigned char bridge_tunnel_header[] = | |
13 | { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 }; | |
14 | /* No encapsulation header if EtherType < 0x600 (=length) */ | |
15 | ||
ff1d2767 JM |
16 | void hostap_dump_tx_80211(const char *name, struct sk_buff *skb) |
17 | { | |
d041674d | 18 | struct ieee80211_hdr_4addr *hdr; |
ff1d2767 JM |
19 | u16 fc; |
20 | ||
d041674d | 21 | hdr = (struct ieee80211_hdr_4addr *) skb->data; |
ff1d2767 JM |
22 | |
23 | printk(KERN_DEBUG "%s: TX len=%d jiffies=%ld\n", | |
24 | name, skb->len, jiffies); | |
25 | ||
26 | if (skb->len < 2) | |
27 | return; | |
28 | ||
c0f72ca8 | 29 | fc = le16_to_cpu(hdr->frame_ctl); |
ff1d2767 | 30 | printk(KERN_DEBUG " FC=0x%04x (type=%d:%d)%s%s", |
4339d328 | 31 | fc, WLAN_FC_GET_TYPE(fc) >> 2, WLAN_FC_GET_STYPE(fc) >> 4, |
b2f4a2e3 JM |
32 | fc & IEEE80211_FCTL_TODS ? " [ToDS]" : "", |
33 | fc & IEEE80211_FCTL_FROMDS ? " [FromDS]" : ""); | |
ff1d2767 JM |
34 | |
35 | if (skb->len < IEEE80211_DATA_HDR3_LEN) { | |
36 | printk("\n"); | |
37 | return; | |
38 | } | |
39 | ||
40 | printk(" dur=0x%04x seq=0x%04x\n", le16_to_cpu(hdr->duration_id), | |
c0f72ca8 | 41 | le16_to_cpu(hdr->seq_ctl)); |
ff1d2767 | 42 | |
e174961c JB |
43 | printk(KERN_DEBUG " A1=%pM", hdr->addr1); |
44 | printk(" A2=%pM", hdr->addr2); | |
45 | printk(" A3=%pM", hdr->addr3); | |
ff1d2767 | 46 | if (skb->len >= 30) |
e174961c | 47 | printk(" A4=%pM", hdr->addr4); |
ff1d2767 JM |
48 | printk("\n"); |
49 | } | |
50 | ||
51 | ||
52 | /* hard_start_xmit function for data interfaces (wlan#, wlan#wds#, wlan#sta) | |
53 | * Convert Ethernet header into a suitable IEEE 802.11 header depending on | |
54 | * device configuration. */ | |
55 | int hostap_data_start_xmit(struct sk_buff *skb, struct net_device *dev) | |
56 | { | |
57 | struct hostap_interface *iface; | |
58 | local_info_t *local; | |
59 | int need_headroom, need_tailroom = 0; | |
d041674d | 60 | struct ieee80211_hdr_4addr hdr; |
ff1d2767 JM |
61 | u16 fc, ethertype = 0; |
62 | enum { | |
63 | WDS_NO = 0, WDS_OWN_FRAME, WDS_COMPLIANT_FRAME | |
64 | } use_wds = WDS_NO; | |
65 | u8 *encaps_data; | |
66 | int hdr_len, encaps_len, skip_header_bytes; | |
67 | int to_assoc_ap = 0; | |
68 | struct hostap_skb_tx_data *meta; | |
69 | ||
70 | iface = netdev_priv(dev); | |
71 | local = iface->local; | |
72 | ||
73 | if (skb->len < ETH_HLEN) { | |
74 | printk(KERN_DEBUG "%s: hostap_data_start_xmit: short skb " | |
75 | "(len=%d)\n", dev->name, skb->len); | |
76 | kfree_skb(skb); | |
77 | return 0; | |
78 | } | |
79 | ||
80 | if (local->ddev != dev) { | |
81 | use_wds = (local->iw_mode == IW_MODE_MASTER && | |
82 | !(local->wds_type & HOSTAP_WDS_STANDARD_FRAME)) ? | |
83 | WDS_OWN_FRAME : WDS_COMPLIANT_FRAME; | |
84 | if (dev == local->stadev) { | |
85 | to_assoc_ap = 1; | |
86 | use_wds = WDS_NO; | |
87 | } else if (dev == local->apdev) { | |
88 | printk(KERN_DEBUG "%s: prism2_tx: trying to use " | |
89 | "AP device with Ethernet net dev\n", dev->name); | |
90 | kfree_skb(skb); | |
91 | return 0; | |
92 | } | |
93 | } else { | |
94 | if (local->iw_mode == IW_MODE_REPEAT) { | |
95 | printk(KERN_DEBUG "%s: prism2_tx: trying to use " | |
96 | "non-WDS link in Repeater mode\n", dev->name); | |
97 | kfree_skb(skb); | |
98 | return 0; | |
99 | } else if (local->iw_mode == IW_MODE_INFRA && | |
100 | (local->wds_type & HOSTAP_WDS_AP_CLIENT) && | |
101 | memcmp(skb->data + ETH_ALEN, dev->dev_addr, | |
102 | ETH_ALEN) != 0) { | |
103 | /* AP client mode: send frames with foreign src addr | |
104 | * using 4-addr WDS frames */ | |
105 | use_wds = WDS_COMPLIANT_FRAME; | |
106 | } | |
107 | } | |
108 | ||
109 | /* Incoming skb->data: dst_addr[6], src_addr[6], proto[2], payload | |
110 | * ==> | |
111 | * Prism2 TX frame with 802.11 header: | |
112 | * txdesc (address order depending on used mode; includes dst_addr and | |
113 | * src_addr), possible encapsulation (RFC1042/Bridge-Tunnel; | |
114 | * proto[2], payload {, possible addr4[6]} */ | |
115 | ||
116 | ethertype = (skb->data[12] << 8) | skb->data[13]; | |
117 | ||
118 | memset(&hdr, 0, sizeof(hdr)); | |
119 | ||
120 | /* Length of data after IEEE 802.11 header */ | |
121 | encaps_data = NULL; | |
122 | encaps_len = 0; | |
123 | skip_header_bytes = ETH_HLEN; | |
124 | if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) { | |
125 | encaps_data = bridge_tunnel_header; | |
126 | encaps_len = sizeof(bridge_tunnel_header); | |
127 | skip_header_bytes -= 2; | |
128 | } else if (ethertype >= 0x600) { | |
129 | encaps_data = rfc1042_header; | |
130 | encaps_len = sizeof(rfc1042_header); | |
131 | skip_header_bytes -= 2; | |
132 | } | |
133 | ||
4339d328 | 134 | fc = IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA; |
ff1d2767 JM |
135 | hdr_len = IEEE80211_DATA_HDR3_LEN; |
136 | ||
137 | if (use_wds != WDS_NO) { | |
138 | /* Note! Prism2 station firmware has problems with sending real | |
139 | * 802.11 frames with four addresses; until these problems can | |
140 | * be fixed or worked around, 4-addr frames needed for WDS are | |
141 | * using incompatible format: FromDS flag is not set and the | |
142 | * fourth address is added after the frame payload; it is | |
143 | * assumed, that the receiving station knows how to handle this | |
144 | * frame format */ | |
145 | ||
146 | if (use_wds == WDS_COMPLIANT_FRAME) { | |
b2f4a2e3 | 147 | fc |= IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS; |
ff1d2767 JM |
148 | /* From&To DS: Addr1 = RA, Addr2 = TA, Addr3 = DA, |
149 | * Addr4 = SA */ | |
d626f62b ACM |
150 | skb_copy_from_linear_data_offset(skb, ETH_ALEN, |
151 | &hdr.addr4, ETH_ALEN); | |
ff1d2767 JM |
152 | hdr_len += ETH_ALEN; |
153 | } else { | |
154 | /* bogus 4-addr format to workaround Prism2 station | |
155 | * f/w bug */ | |
b2f4a2e3 | 156 | fc |= IEEE80211_FCTL_TODS; |
ff1d2767 JM |
157 | /* From DS: Addr1 = DA (used as RA), |
158 | * Addr2 = BSSID (used as TA), Addr3 = SA (used as DA), | |
159 | */ | |
160 | ||
161 | /* SA from skb->data + ETH_ALEN will be added after | |
162 | * frame payload; use hdr.addr4 as a temporary buffer | |
163 | */ | |
d626f62b ACM |
164 | skb_copy_from_linear_data_offset(skb, ETH_ALEN, |
165 | &hdr.addr4, ETH_ALEN); | |
ff1d2767 JM |
166 | need_tailroom += ETH_ALEN; |
167 | } | |
168 | ||
169 | /* send broadcast and multicast frames to broadcast RA, if | |
170 | * configured; otherwise, use unicast RA of the WDS link */ | |
171 | if ((local->wds_type & HOSTAP_WDS_BROADCAST_RA) && | |
172 | skb->data[0] & 0x01) | |
173 | memset(&hdr.addr1, 0xff, ETH_ALEN); | |
174 | else if (iface->type == HOSTAP_INTERFACE_WDS) | |
175 | memcpy(&hdr.addr1, iface->u.wds.remote_addr, | |
176 | ETH_ALEN); | |
177 | else | |
178 | memcpy(&hdr.addr1, local->bssid, ETH_ALEN); | |
179 | memcpy(&hdr.addr2, dev->dev_addr, ETH_ALEN); | |
d626f62b | 180 | skb_copy_from_linear_data(skb, &hdr.addr3, ETH_ALEN); |
ff1d2767 | 181 | } else if (local->iw_mode == IW_MODE_MASTER && !to_assoc_ap) { |
b2f4a2e3 | 182 | fc |= IEEE80211_FCTL_FROMDS; |
ff1d2767 | 183 | /* From DS: Addr1 = DA, Addr2 = BSSID, Addr3 = SA */ |
d626f62b | 184 | skb_copy_from_linear_data(skb, &hdr.addr1, ETH_ALEN); |
ff1d2767 | 185 | memcpy(&hdr.addr2, dev->dev_addr, ETH_ALEN); |
d626f62b ACM |
186 | skb_copy_from_linear_data_offset(skb, ETH_ALEN, &hdr.addr3, |
187 | ETH_ALEN); | |
ff1d2767 | 188 | } else if (local->iw_mode == IW_MODE_INFRA || to_assoc_ap) { |
b2f4a2e3 | 189 | fc |= IEEE80211_FCTL_TODS; |
ff1d2767 JM |
190 | /* To DS: Addr1 = BSSID, Addr2 = SA, Addr3 = DA */ |
191 | memcpy(&hdr.addr1, to_assoc_ap ? | |
192 | local->assoc_ap_addr : local->bssid, ETH_ALEN); | |
d626f62b ACM |
193 | skb_copy_from_linear_data_offset(skb, ETH_ALEN, &hdr.addr2, |
194 | ETH_ALEN); | |
195 | skb_copy_from_linear_data(skb, &hdr.addr3, ETH_ALEN); | |
ff1d2767 JM |
196 | } else if (local->iw_mode == IW_MODE_ADHOC) { |
197 | /* not From/To DS: Addr1 = DA, Addr2 = SA, Addr3 = BSSID */ | |
d626f62b ACM |
198 | skb_copy_from_linear_data(skb, &hdr.addr1, ETH_ALEN); |
199 | skb_copy_from_linear_data_offset(skb, ETH_ALEN, &hdr.addr2, | |
200 | ETH_ALEN); | |
ff1d2767 JM |
201 | memcpy(&hdr.addr3, local->bssid, ETH_ALEN); |
202 | } | |
203 | ||
c0f72ca8 | 204 | hdr.frame_ctl = cpu_to_le16(fc); |
ff1d2767 JM |
205 | |
206 | skb_pull(skb, skip_header_bytes); | |
207 | need_headroom = local->func->need_tx_headroom + hdr_len + encaps_len; | |
208 | if (skb_tailroom(skb) < need_tailroom) { | |
209 | skb = skb_unshare(skb, GFP_ATOMIC); | |
210 | if (skb == NULL) { | |
211 | iface->stats.tx_dropped++; | |
212 | return 0; | |
213 | } | |
214 | if (pskb_expand_head(skb, need_headroom, need_tailroom, | |
215 | GFP_ATOMIC)) { | |
216 | kfree_skb(skb); | |
217 | iface->stats.tx_dropped++; | |
218 | return 0; | |
219 | } | |
220 | } else if (skb_headroom(skb) < need_headroom) { | |
221 | struct sk_buff *tmp = skb; | |
222 | skb = skb_realloc_headroom(skb, need_headroom); | |
223 | kfree_skb(tmp); | |
224 | if (skb == NULL) { | |
225 | iface->stats.tx_dropped++; | |
226 | return 0; | |
227 | } | |
228 | } else { | |
229 | skb = skb_unshare(skb, GFP_ATOMIC); | |
230 | if (skb == NULL) { | |
231 | iface->stats.tx_dropped++; | |
232 | return 0; | |
233 | } | |
234 | } | |
235 | ||
236 | if (encaps_data) | |
237 | memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len); | |
238 | memcpy(skb_push(skb, hdr_len), &hdr, hdr_len); | |
239 | if (use_wds == WDS_OWN_FRAME) { | |
240 | memcpy(skb_put(skb, ETH_ALEN), &hdr.addr4, ETH_ALEN); | |
241 | } | |
242 | ||
243 | iface->stats.tx_packets++; | |
244 | iface->stats.tx_bytes += skb->len; | |
245 | ||
459a98ed | 246 | skb_reset_mac_header(skb); |
ff1d2767 JM |
247 | meta = (struct hostap_skb_tx_data *) skb->cb; |
248 | memset(meta, 0, sizeof(*meta)); | |
249 | meta->magic = HOSTAP_SKB_TX_DATA_MAGIC; | |
5bee720f JM |
250 | if (use_wds) |
251 | meta->flags |= HOSTAP_TX_FLAGS_WDS; | |
ff1d2767 JM |
252 | meta->ethertype = ethertype; |
253 | meta->iface = iface; | |
254 | ||
255 | /* Send IEEE 802.11 encapsulated frame using the master radio device */ | |
256 | skb->dev = local->dev; | |
257 | dev_queue_xmit(skb); | |
258 | return 0; | |
259 | } | |
260 | ||
261 | ||
262 | /* hard_start_xmit function for hostapd wlan#ap interfaces */ | |
263 | int hostap_mgmt_start_xmit(struct sk_buff *skb, struct net_device *dev) | |
264 | { | |
265 | struct hostap_interface *iface; | |
266 | local_info_t *local; | |
267 | struct hostap_skb_tx_data *meta; | |
d041674d | 268 | struct ieee80211_hdr_4addr *hdr; |
ff1d2767 JM |
269 | u16 fc; |
270 | ||
271 | iface = netdev_priv(dev); | |
272 | local = iface->local; | |
273 | ||
274 | if (skb->len < 10) { | |
275 | printk(KERN_DEBUG "%s: hostap_mgmt_start_xmit: short skb " | |
276 | "(len=%d)\n", dev->name, skb->len); | |
277 | kfree_skb(skb); | |
278 | return 0; | |
279 | } | |
280 | ||
281 | iface->stats.tx_packets++; | |
282 | iface->stats.tx_bytes += skb->len; | |
283 | ||
284 | meta = (struct hostap_skb_tx_data *) skb->cb; | |
285 | memset(meta, 0, sizeof(*meta)); | |
286 | meta->magic = HOSTAP_SKB_TX_DATA_MAGIC; | |
287 | meta->iface = iface; | |
288 | ||
289 | if (skb->len >= IEEE80211_DATA_HDR3_LEN + sizeof(rfc1042_header) + 2) { | |
d041674d | 290 | hdr = (struct ieee80211_hdr_4addr *) skb->data; |
c0f72ca8 | 291 | fc = le16_to_cpu(hdr->frame_ctl); |
4339d328 JM |
292 | if (WLAN_FC_GET_TYPE(fc) == IEEE80211_FTYPE_DATA && |
293 | WLAN_FC_GET_STYPE(fc) == IEEE80211_STYPE_DATA) { | |
ff1d2767 JM |
294 | u8 *pos = &skb->data[IEEE80211_DATA_HDR3_LEN + |
295 | sizeof(rfc1042_header)]; | |
296 | meta->ethertype = (pos[0] << 8) | pos[1]; | |
297 | } | |
298 | } | |
299 | ||
300 | /* Send IEEE 802.11 encapsulated frame using the master radio device */ | |
301 | skb->dev = local->dev; | |
302 | dev_queue_xmit(skb); | |
303 | return 0; | |
304 | } | |
305 | ||
306 | ||
307 | /* Called only from software IRQ */ | |
79058aca JM |
308 | static struct sk_buff * hostap_tx_encrypt(struct sk_buff *skb, |
309 | struct ieee80211_crypt_data *crypt) | |
ff1d2767 JM |
310 | { |
311 | struct hostap_interface *iface; | |
312 | local_info_t *local; | |
d041674d | 313 | struct ieee80211_hdr_4addr *hdr; |
ff1d2767 | 314 | u16 fc; |
d7ea3be5 | 315 | int prefix_len, postfix_len, hdr_len, res; |
ff1d2767 JM |
316 | |
317 | iface = netdev_priv(skb->dev); | |
318 | local = iface->local; | |
319 | ||
320 | if (skb->len < IEEE80211_DATA_HDR3_LEN) { | |
321 | kfree_skb(skb); | |
322 | return NULL; | |
323 | } | |
324 | ||
325 | if (local->tkip_countermeasures && | |
79058aca | 326 | strcmp(crypt->ops->name, "TKIP") == 0) { |
d041674d | 327 | hdr = (struct ieee80211_hdr_4addr *) skb->data; |
ff1d2767 JM |
328 | if (net_ratelimit()) { |
329 | printk(KERN_DEBUG "%s: TKIP countermeasures: dropped " | |
e174961c JB |
330 | "TX packet to %pM\n", |
331 | local->dev->name, hdr->addr1); | |
ff1d2767 JM |
332 | } |
333 | kfree_skb(skb); | |
334 | return NULL; | |
335 | } | |
336 | ||
337 | skb = skb_unshare(skb, GFP_ATOMIC); | |
338 | if (skb == NULL) | |
339 | return NULL; | |
340 | ||
d7ea3be5 BCR |
341 | prefix_len = crypt->ops->extra_mpdu_prefix_len + |
342 | crypt->ops->extra_msdu_prefix_len; | |
343 | postfix_len = crypt->ops->extra_mpdu_postfix_len + | |
344 | crypt->ops->extra_msdu_postfix_len; | |
345 | if ((skb_headroom(skb) < prefix_len || | |
346 | skb_tailroom(skb) < postfix_len) && | |
347 | pskb_expand_head(skb, prefix_len, postfix_len, GFP_ATOMIC)) { | |
ff1d2767 JM |
348 | kfree_skb(skb); |
349 | return NULL; | |
350 | } | |
351 | ||
d041674d | 352 | hdr = (struct ieee80211_hdr_4addr *) skb->data; |
c0f72ca8 | 353 | fc = le16_to_cpu(hdr->frame_ctl); |
ff1d2767 JM |
354 | hdr_len = hostap_80211_get_hdrlen(fc); |
355 | ||
356 | /* Host-based IEEE 802.11 fragmentation for TX is not yet supported, so | |
357 | * call both MSDU and MPDU encryption functions from here. */ | |
358 | atomic_inc(&crypt->refcnt); | |
359 | res = 0; | |
360 | if (crypt->ops->encrypt_msdu) | |
361 | res = crypt->ops->encrypt_msdu(skb, hdr_len, crypt->priv); | |
362 | if (res == 0 && crypt->ops->encrypt_mpdu) | |
363 | res = crypt->ops->encrypt_mpdu(skb, hdr_len, crypt->priv); | |
364 | atomic_dec(&crypt->refcnt); | |
365 | if (res < 0) { | |
366 | kfree_skb(skb); | |
367 | return NULL; | |
368 | } | |
369 | ||
370 | return skb; | |
371 | } | |
372 | ||
373 | ||
374 | /* hard_start_xmit function for master radio interface wifi#. | |
375 | * AP processing (TX rate control, power save buffering, etc.). | |
376 | * Use hardware TX function to send the frame. */ | |
377 | int hostap_master_start_xmit(struct sk_buff *skb, struct net_device *dev) | |
378 | { | |
379 | struct hostap_interface *iface; | |
380 | local_info_t *local; | |
381 | int ret = 1; | |
382 | u16 fc; | |
383 | struct hostap_tx_data tx; | |
384 | ap_tx_ret tx_ret; | |
385 | struct hostap_skb_tx_data *meta; | |
386 | int no_encrypt = 0; | |
d041674d | 387 | struct ieee80211_hdr_4addr *hdr; |
ff1d2767 JM |
388 | |
389 | iface = netdev_priv(dev); | |
390 | local = iface->local; | |
391 | ||
392 | tx.skb = skb; | |
393 | tx.sta_ptr = NULL; | |
394 | ||
395 | meta = (struct hostap_skb_tx_data *) skb->cb; | |
396 | if (meta->magic != HOSTAP_SKB_TX_DATA_MAGIC) { | |
397 | printk(KERN_DEBUG "%s: invalid skb->cb magic (0x%08x, " | |
398 | "expected 0x%08x)\n", | |
399 | dev->name, meta->magic, HOSTAP_SKB_TX_DATA_MAGIC); | |
400 | ret = 0; | |
401 | iface->stats.tx_dropped++; | |
402 | goto fail; | |
403 | } | |
404 | ||
405 | if (local->host_encrypt) { | |
406 | /* Set crypt to default algorithm and key; will be replaced in | |
407 | * AP code if STA has own alg/key */ | |
408 | tx.crypt = local->crypt[local->tx_keyidx]; | |
409 | tx.host_encrypt = 1; | |
410 | } else { | |
411 | tx.crypt = NULL; | |
412 | tx.host_encrypt = 0; | |
413 | } | |
414 | ||
415 | if (skb->len < 24) { | |
416 | printk(KERN_DEBUG "%s: hostap_master_start_xmit: short skb " | |
417 | "(len=%d)\n", dev->name, skb->len); | |
418 | ret = 0; | |
419 | iface->stats.tx_dropped++; | |
420 | goto fail; | |
421 | } | |
422 | ||
423 | /* FIX (?): | |
424 | * Wi-Fi 802.11b test plan suggests that AP should ignore power save | |
425 | * bit in authentication and (re)association frames and assume tha | |
426 | * STA remains awake for the response. */ | |
427 | tx_ret = hostap_handle_sta_tx(local, &tx); | |
428 | skb = tx.skb; | |
429 | meta = (struct hostap_skb_tx_data *) skb->cb; | |
d041674d | 430 | hdr = (struct ieee80211_hdr_4addr *) skb->data; |
c0f72ca8 | 431 | fc = le16_to_cpu(hdr->frame_ctl); |
ff1d2767 JM |
432 | switch (tx_ret) { |
433 | case AP_TX_CONTINUE: | |
434 | break; | |
435 | case AP_TX_CONTINUE_NOT_AUTHORIZED: | |
436 | if (local->ieee_802_1x && | |
4339d328 | 437 | WLAN_FC_GET_TYPE(fc) == IEEE80211_FTYPE_DATA && |
5bee720f JM |
438 | meta->ethertype != ETH_P_PAE && |
439 | !(meta->flags & HOSTAP_TX_FLAGS_WDS)) { | |
ff1d2767 JM |
440 | printk(KERN_DEBUG "%s: dropped frame to unauthorized " |
441 | "port (IEEE 802.1X): ethertype=0x%04x\n", | |
442 | dev->name, meta->ethertype); | |
443 | hostap_dump_tx_80211(dev->name, skb); | |
444 | ||
445 | ret = 0; /* drop packet */ | |
446 | iface->stats.tx_dropped++; | |
447 | goto fail; | |
448 | } | |
449 | break; | |
450 | case AP_TX_DROP: | |
451 | ret = 0; /* drop packet */ | |
452 | iface->stats.tx_dropped++; | |
453 | goto fail; | |
454 | case AP_TX_RETRY: | |
455 | goto fail; | |
456 | case AP_TX_BUFFERED: | |
457 | /* do not free skb here, it will be freed when the | |
458 | * buffered frame is sent/timed out */ | |
459 | ret = 0; | |
460 | goto tx_exit; | |
461 | } | |
462 | ||
463 | /* Request TX callback if protocol version is 2 in 802.11 header; | |
464 | * this version 2 is a special case used between hostapd and kernel | |
465 | * driver */ | |
b2f4a2e3 | 466 | if (((fc & IEEE80211_FCTL_VERS) == BIT(1)) && |
ff1d2767 JM |
467 | local->ap && local->ap->tx_callback_idx && meta->tx_cb_idx == 0) { |
468 | meta->tx_cb_idx = local->ap->tx_callback_idx; | |
469 | ||
470 | /* remove special version from the frame header */ | |
b2f4a2e3 | 471 | fc &= ~IEEE80211_FCTL_VERS; |
c0f72ca8 | 472 | hdr->frame_ctl = cpu_to_le16(fc); |
ff1d2767 JM |
473 | } |
474 | ||
4339d328 | 475 | if (WLAN_FC_GET_TYPE(fc) != IEEE80211_FTYPE_DATA) { |
ff1d2767 JM |
476 | no_encrypt = 1; |
477 | tx.crypt = NULL; | |
478 | } | |
479 | ||
480 | if (local->ieee_802_1x && meta->ethertype == ETH_P_PAE && tx.crypt && | |
cfa146e4 | 481 | !(fc & IEEE80211_FCTL_PROTECTED)) { |
ff1d2767 JM |
482 | no_encrypt = 1; |
483 | PDEBUG(DEBUG_EXTRA2, "%s: TX: IEEE 802.1X - passing " | |
484 | "unencrypted EAPOL frame\n", dev->name); | |
485 | tx.crypt = NULL; /* no encryption for IEEE 802.1X frames */ | |
486 | } | |
487 | ||
488 | if (tx.crypt && (!tx.crypt->ops || !tx.crypt->ops->encrypt_mpdu)) | |
489 | tx.crypt = NULL; | |
490 | else if ((tx.crypt || local->crypt[local->tx_keyidx]) && !no_encrypt) { | |
491 | /* Add ISWEP flag both for firmware and host based encryption | |
492 | */ | |
831a179f | 493 | fc |= IEEE80211_FCTL_PROTECTED; |
c0f72ca8 | 494 | hdr->frame_ctl = cpu_to_le16(fc); |
ff1d2767 | 495 | } else if (local->drop_unencrypted && |
4339d328 | 496 | WLAN_FC_GET_TYPE(fc) == IEEE80211_FTYPE_DATA && |
ff1d2767 JM |
497 | meta->ethertype != ETH_P_PAE) { |
498 | if (net_ratelimit()) { | |
499 | printk(KERN_DEBUG "%s: dropped unencrypted TX data " | |
500 | "frame (drop_unencrypted=1)\n", dev->name); | |
501 | } | |
502 | iface->stats.tx_dropped++; | |
503 | ret = 0; | |
504 | goto fail; | |
505 | } | |
506 | ||
507 | if (tx.crypt) { | |
508 | skb = hostap_tx_encrypt(skb, tx.crypt); | |
509 | if (skb == NULL) { | |
510 | printk(KERN_DEBUG "%s: TX - encryption failed\n", | |
511 | dev->name); | |
512 | ret = 0; | |
513 | goto fail; | |
514 | } | |
515 | meta = (struct hostap_skb_tx_data *) skb->cb; | |
516 | if (meta->magic != HOSTAP_SKB_TX_DATA_MAGIC) { | |
517 | printk(KERN_DEBUG "%s: invalid skb->cb magic (0x%08x, " | |
518 | "expected 0x%08x) after hostap_tx_encrypt\n", | |
519 | dev->name, meta->magic, | |
520 | HOSTAP_SKB_TX_DATA_MAGIC); | |
521 | ret = 0; | |
522 | iface->stats.tx_dropped++; | |
523 | goto fail; | |
524 | } | |
525 | } | |
526 | ||
527 | if (local->func->tx == NULL || local->func->tx(skb, dev)) { | |
528 | ret = 0; | |
529 | iface->stats.tx_dropped++; | |
530 | } else { | |
531 | ret = 0; | |
532 | iface->stats.tx_packets++; | |
533 | iface->stats.tx_bytes += skb->len; | |
534 | } | |
535 | ||
536 | fail: | |
537 | if (!ret && skb) | |
538 | dev_kfree_skb(skb); | |
539 | tx_exit: | |
540 | if (tx.sta_ptr) | |
541 | hostap_handle_sta_release(tx.sta_ptr); | |
542 | return ret; | |
543 | } | |
544 | ||
545 | ||
ff1d2767 | 546 | EXPORT_SYMBOL(hostap_master_start_xmit); |