1 #include "hostap_80211.h"
2 #include "hostap_common.h"
3 #include "hostap_wlan.h"
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) */
16 void hostap_dump_tx_80211(const char *name, struct sk_buff *skb)
18 struct ieee80211_hdr *hdr;
21 hdr = (struct ieee80211_hdr *) skb->data;
23 printk(KERN_DEBUG "%s: TX len=%d jiffies=%ld\n",
24 name, skb->len, jiffies);
29 fc = le16_to_cpu(hdr->frame_control);
30 printk(KERN_DEBUG " FC=0x%04x (type=%d:%d)%s%s",
31 fc, (fc & IEEE80211_FCTL_FTYPE) >> 2,
32 (fc & IEEE80211_FCTL_STYPE) >> 4,
33 fc & IEEE80211_FCTL_TODS ? " [ToDS]" : "",
34 fc & IEEE80211_FCTL_FROMDS ? " [FromDS]" : "");
36 if (skb->len < IEEE80211_DATA_HDR3_LEN) {
41 printk(" dur=0x%04x seq=0x%04x\n", le16_to_cpu(hdr->duration_id),
42 le16_to_cpu(hdr->seq_ctrl));
44 printk(KERN_DEBUG " A1=%pM", hdr->addr1);
45 printk(" A2=%pM", hdr->addr2);
46 printk(" A3=%pM", hdr->addr3);
48 printk(" A4=%pM", hdr->addr4);
53 /* hard_start_xmit function for data interfaces (wlan#, wlan#wds#, wlan#sta)
54 * Convert Ethernet header into a suitable IEEE 802.11 header depending on
55 * device configuration. */
56 netdev_tx_t hostap_data_start_xmit(struct sk_buff *skb,
57 struct net_device *dev)
59 struct hostap_interface *iface;
61 int need_headroom, need_tailroom = 0;
62 struct ieee80211_hdr hdr;
63 u16 fc, ethertype = 0;
65 WDS_NO = 0, WDS_OWN_FRAME, WDS_COMPLIANT_FRAME
68 int hdr_len, encaps_len, skip_header_bytes;
70 struct hostap_skb_tx_data *meta;
72 iface = netdev_priv(dev);
75 if (skb->len < ETH_HLEN) {
76 printk(KERN_DEBUG "%s: hostap_data_start_xmit: short skb "
77 "(len=%d)\n", dev->name, skb->len);
82 if (local->ddev != dev) {
83 use_wds = (local->iw_mode == IW_MODE_MASTER &&
84 !(local->wds_type & HOSTAP_WDS_STANDARD_FRAME)) ?
85 WDS_OWN_FRAME : WDS_COMPLIANT_FRAME;
86 if (dev == local->stadev) {
89 } else if (dev == local->apdev) {
90 printk(KERN_DEBUG "%s: prism2_tx: trying to use "
91 "AP device with Ethernet net dev\n", dev->name);
96 if (local->iw_mode == IW_MODE_REPEAT) {
97 printk(KERN_DEBUG "%s: prism2_tx: trying to use "
98 "non-WDS link in Repeater mode\n", dev->name);
101 } else if (local->iw_mode == IW_MODE_INFRA &&
102 (local->wds_type & HOSTAP_WDS_AP_CLIENT) &&
103 memcmp(skb->data + ETH_ALEN, dev->dev_addr,
105 /* AP client mode: send frames with foreign src addr
106 * using 4-addr WDS frames */
107 use_wds = WDS_COMPLIANT_FRAME;
111 /* Incoming skb->data: dst_addr[6], src_addr[6], proto[2], payload
113 * Prism2 TX frame with 802.11 header:
114 * txdesc (address order depending on used mode; includes dst_addr and
115 * src_addr), possible encapsulation (RFC1042/Bridge-Tunnel;
116 * proto[2], payload {, possible addr4[6]} */
118 ethertype = (skb->data[12] << 8) | skb->data[13];
120 memset(&hdr, 0, sizeof(hdr));
122 /* Length of data after IEEE 802.11 header */
125 skip_header_bytes = ETH_HLEN;
126 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
127 encaps_data = bridge_tunnel_header;
128 encaps_len = sizeof(bridge_tunnel_header);
129 skip_header_bytes -= 2;
130 } else if (ethertype >= 0x600) {
131 encaps_data = rfc1042_header;
132 encaps_len = sizeof(rfc1042_header);
133 skip_header_bytes -= 2;
136 fc = IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA;
137 hdr_len = IEEE80211_DATA_HDR3_LEN;
139 if (use_wds != WDS_NO) {
140 /* Note! Prism2 station firmware has problems with sending real
141 * 802.11 frames with four addresses; until these problems can
142 * be fixed or worked around, 4-addr frames needed for WDS are
143 * using incompatible format: FromDS flag is not set and the
144 * fourth address is added after the frame payload; it is
145 * assumed, that the receiving station knows how to handle this
148 if (use_wds == WDS_COMPLIANT_FRAME) {
149 fc |= IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS;
150 /* From&To DS: Addr1 = RA, Addr2 = TA, Addr3 = DA,
152 skb_copy_from_linear_data_offset(skb, ETH_ALEN,
153 &hdr.addr4, ETH_ALEN);
156 /* bogus 4-addr format to workaround Prism2 station
158 fc |= IEEE80211_FCTL_TODS;
159 /* From DS: Addr1 = DA (used as RA),
160 * Addr2 = BSSID (used as TA), Addr3 = SA (used as DA),
163 /* SA from skb->data + ETH_ALEN will be added after
164 * frame payload; use hdr.addr4 as a temporary buffer
166 skb_copy_from_linear_data_offset(skb, ETH_ALEN,
167 &hdr.addr4, ETH_ALEN);
168 need_tailroom += ETH_ALEN;
171 /* send broadcast and multicast frames to broadcast RA, if
172 * configured; otherwise, use unicast RA of the WDS link */
173 if ((local->wds_type & HOSTAP_WDS_BROADCAST_RA) &&
175 memset(&hdr.addr1, 0xff, ETH_ALEN);
176 else if (iface->type == HOSTAP_INTERFACE_WDS)
177 memcpy(&hdr.addr1, iface->u.wds.remote_addr,
180 memcpy(&hdr.addr1, local->bssid, ETH_ALEN);
181 memcpy(&hdr.addr2, dev->dev_addr, ETH_ALEN);
182 skb_copy_from_linear_data(skb, &hdr.addr3, ETH_ALEN);
183 } else if (local->iw_mode == IW_MODE_MASTER && !to_assoc_ap) {
184 fc |= IEEE80211_FCTL_FROMDS;
185 /* From DS: Addr1 = DA, Addr2 = BSSID, Addr3 = SA */
186 skb_copy_from_linear_data(skb, &hdr.addr1, ETH_ALEN);
187 memcpy(&hdr.addr2, dev->dev_addr, ETH_ALEN);
188 skb_copy_from_linear_data_offset(skb, ETH_ALEN, &hdr.addr3,
190 } else if (local->iw_mode == IW_MODE_INFRA || to_assoc_ap) {
191 fc |= IEEE80211_FCTL_TODS;
192 /* To DS: Addr1 = BSSID, Addr2 = SA, Addr3 = DA */
193 memcpy(&hdr.addr1, to_assoc_ap ?
194 local->assoc_ap_addr : local->bssid, ETH_ALEN);
195 skb_copy_from_linear_data_offset(skb, ETH_ALEN, &hdr.addr2,
197 skb_copy_from_linear_data(skb, &hdr.addr3, ETH_ALEN);
198 } else if (local->iw_mode == IW_MODE_ADHOC) {
199 /* not From/To DS: Addr1 = DA, Addr2 = SA, Addr3 = BSSID */
200 skb_copy_from_linear_data(skb, &hdr.addr1, ETH_ALEN);
201 skb_copy_from_linear_data_offset(skb, ETH_ALEN, &hdr.addr2,
203 memcpy(&hdr.addr3, local->bssid, ETH_ALEN);
206 hdr.frame_control = cpu_to_le16(fc);
208 skb_pull(skb, skip_header_bytes);
209 need_headroom = local->func->need_tx_headroom + hdr_len + encaps_len;
210 if (skb_tailroom(skb) < need_tailroom) {
211 skb = skb_unshare(skb, GFP_ATOMIC);
213 iface->stats.tx_dropped++;
216 if (pskb_expand_head(skb, need_headroom, need_tailroom,
219 iface->stats.tx_dropped++;
222 } else if (skb_headroom(skb) < need_headroom) {
223 struct sk_buff *tmp = skb;
224 skb = skb_realloc_headroom(skb, need_headroom);
227 iface->stats.tx_dropped++;
231 skb = skb_unshare(skb, GFP_ATOMIC);
233 iface->stats.tx_dropped++;
239 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
240 memcpy(skb_push(skb, hdr_len), &hdr, hdr_len);
241 if (use_wds == WDS_OWN_FRAME) {
242 memcpy(skb_put(skb, ETH_ALEN), &hdr.addr4, ETH_ALEN);
245 iface->stats.tx_packets++;
246 iface->stats.tx_bytes += skb->len;
248 skb_reset_mac_header(skb);
249 meta = (struct hostap_skb_tx_data *) skb->cb;
250 memset(meta, 0, sizeof(*meta));
251 meta->magic = HOSTAP_SKB_TX_DATA_MAGIC;
253 meta->flags |= HOSTAP_TX_FLAGS_WDS;
254 meta->ethertype = ethertype;
257 /* Send IEEE 802.11 encapsulated frame using the master radio device */
258 skb->dev = local->dev;
264 /* hard_start_xmit function for hostapd wlan#ap interfaces */
265 netdev_tx_t hostap_mgmt_start_xmit(struct sk_buff *skb,
266 struct net_device *dev)
268 struct hostap_interface *iface;
270 struct hostap_skb_tx_data *meta;
271 struct ieee80211_hdr *hdr;
274 iface = netdev_priv(dev);
275 local = iface->local;
278 printk(KERN_DEBUG "%s: hostap_mgmt_start_xmit: short skb "
279 "(len=%d)\n", dev->name, skb->len);
284 iface->stats.tx_packets++;
285 iface->stats.tx_bytes += skb->len;
287 meta = (struct hostap_skb_tx_data *) skb->cb;
288 memset(meta, 0, sizeof(*meta));
289 meta->magic = HOSTAP_SKB_TX_DATA_MAGIC;
292 if (skb->len >= IEEE80211_DATA_HDR3_LEN + sizeof(rfc1042_header) + 2) {
293 hdr = (struct ieee80211_hdr *) skb->data;
294 fc = le16_to_cpu(hdr->frame_control);
295 if (ieee80211_is_data(hdr->frame_control) &&
296 (fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_DATA) {
297 u8 *pos = &skb->data[IEEE80211_DATA_HDR3_LEN +
298 sizeof(rfc1042_header)];
299 meta->ethertype = (pos[0] << 8) | pos[1];
303 /* Send IEEE 802.11 encapsulated frame using the master radio device */
304 skb->dev = local->dev;
310 /* Called only from software IRQ */
311 static struct sk_buff * hostap_tx_encrypt(struct sk_buff *skb,
312 struct lib80211_crypt_data *crypt)
314 struct hostap_interface *iface;
316 struct ieee80211_hdr *hdr;
317 int prefix_len, postfix_len, hdr_len, res;
319 iface = netdev_priv(skb->dev);
320 local = iface->local;
322 if (skb->len < IEEE80211_DATA_HDR3_LEN) {
327 if (local->tkip_countermeasures &&
328 strcmp(crypt->ops->name, "TKIP") == 0) {
329 hdr = (struct ieee80211_hdr *) skb->data;
330 if (net_ratelimit()) {
331 printk(KERN_DEBUG "%s: TKIP countermeasures: dropped "
332 "TX packet to %pM\n",
333 local->dev->name, hdr->addr1);
339 skb = skb_unshare(skb, GFP_ATOMIC);
343 prefix_len = crypt->ops->extra_mpdu_prefix_len +
344 crypt->ops->extra_msdu_prefix_len;
345 postfix_len = crypt->ops->extra_mpdu_postfix_len +
346 crypt->ops->extra_msdu_postfix_len;
347 if ((skb_headroom(skb) < prefix_len ||
348 skb_tailroom(skb) < postfix_len) &&
349 pskb_expand_head(skb, prefix_len, postfix_len, GFP_ATOMIC)) {
354 hdr = (struct ieee80211_hdr *) skb->data;
355 hdr_len = hostap_80211_get_hdrlen(hdr->frame_control);
357 /* Host-based IEEE 802.11 fragmentation for TX is not yet supported, so
358 * call both MSDU and MPDU encryption functions from here. */
359 atomic_inc(&crypt->refcnt);
361 if (crypt->ops->encrypt_msdu)
362 res = crypt->ops->encrypt_msdu(skb, hdr_len, crypt->priv);
363 if (res == 0 && crypt->ops->encrypt_mpdu)
364 res = crypt->ops->encrypt_mpdu(skb, hdr_len, crypt->priv);
365 atomic_dec(&crypt->refcnt);
375 /* hard_start_xmit function for master radio interface wifi#.
376 * AP processing (TX rate control, power save buffering, etc.).
377 * Use hardware TX function to send the frame. */
378 netdev_tx_t hostap_master_start_xmit(struct sk_buff *skb,
379 struct net_device *dev)
381 struct hostap_interface *iface;
383 netdev_tx_t ret = NETDEV_TX_BUSY;
385 struct hostap_tx_data tx;
387 struct hostap_skb_tx_data *meta;
389 struct ieee80211_hdr *hdr;
391 iface = netdev_priv(dev);
392 local = iface->local;
397 meta = (struct hostap_skb_tx_data *) skb->cb;
398 if (meta->magic != HOSTAP_SKB_TX_DATA_MAGIC) {
399 printk(KERN_DEBUG "%s: invalid skb->cb magic (0x%08x, "
400 "expected 0x%08x)\n",
401 dev->name, meta->magic, HOSTAP_SKB_TX_DATA_MAGIC);
403 iface->stats.tx_dropped++;
407 if (local->host_encrypt) {
408 /* Set crypt to default algorithm and key; will be replaced in
409 * AP code if STA has own alg/key */
410 tx.crypt = local->crypt_info.crypt[local->crypt_info.tx_keyidx];
418 printk(KERN_DEBUG "%s: hostap_master_start_xmit: short skb "
419 "(len=%d)\n", dev->name, skb->len);
421 iface->stats.tx_dropped++;
426 * Wi-Fi 802.11b test plan suggests that AP should ignore power save
427 * bit in authentication and (re)association frames and assume tha
428 * STA remains awake for the response. */
429 tx_ret = hostap_handle_sta_tx(local, &tx);
431 meta = (struct hostap_skb_tx_data *) skb->cb;
432 hdr = (struct ieee80211_hdr *) skb->data;
433 fc = le16_to_cpu(hdr->frame_control);
437 case AP_TX_CONTINUE_NOT_AUTHORIZED:
438 if (local->ieee_802_1x &&
439 ieee80211_is_data(hdr->frame_control) &&
440 meta->ethertype != ETH_P_PAE &&
441 !(meta->flags & HOSTAP_TX_FLAGS_WDS)) {
442 printk(KERN_DEBUG "%s: dropped frame to unauthorized "
443 "port (IEEE 802.1X): ethertype=0x%04x\n",
444 dev->name, meta->ethertype);
445 hostap_dump_tx_80211(dev->name, skb);
447 ret = NETDEV_TX_OK; /* drop packet */
448 iface->stats.tx_dropped++;
453 ret = NETDEV_TX_OK; /* drop packet */
454 iface->stats.tx_dropped++;
459 /* do not free skb here, it will be freed when the
460 * buffered frame is sent/timed out */
465 /* Request TX callback if protocol version is 2 in 802.11 header;
466 * this version 2 is a special case used between hostapd and kernel
468 if (((fc & IEEE80211_FCTL_VERS) == BIT(1)) &&
469 local->ap && local->ap->tx_callback_idx && meta->tx_cb_idx == 0) {
470 meta->tx_cb_idx = local->ap->tx_callback_idx;
472 /* remove special version from the frame header */
473 fc &= ~IEEE80211_FCTL_VERS;
474 hdr->frame_control = cpu_to_le16(fc);
477 if (!ieee80211_is_data(hdr->frame_control)) {
482 if (local->ieee_802_1x && meta->ethertype == ETH_P_PAE && tx.crypt &&
483 !(fc & IEEE80211_FCTL_PROTECTED)) {
485 PDEBUG(DEBUG_EXTRA2, "%s: TX: IEEE 802.1X - passing "
486 "unencrypted EAPOL frame\n", dev->name);
487 tx.crypt = NULL; /* no encryption for IEEE 802.1X frames */
490 if (tx.crypt && (!tx.crypt->ops || !tx.crypt->ops->encrypt_mpdu))
492 else if ((tx.crypt ||
493 local->crypt_info.crypt[local->crypt_info.tx_keyidx]) &&
495 /* Add ISWEP flag both for firmware and host based encryption
497 fc |= IEEE80211_FCTL_PROTECTED;
498 hdr->frame_control = cpu_to_le16(fc);
499 } else if (local->drop_unencrypted &&
500 ieee80211_is_data(hdr->frame_control) &&
501 meta->ethertype != ETH_P_PAE) {
502 if (net_ratelimit()) {
503 printk(KERN_DEBUG "%s: dropped unencrypted TX data "
504 "frame (drop_unencrypted=1)\n", dev->name);
506 iface->stats.tx_dropped++;
512 skb = hostap_tx_encrypt(skb, tx.crypt);
514 printk(KERN_DEBUG "%s: TX - encryption failed\n",
519 meta = (struct hostap_skb_tx_data *) skb->cb;
520 if (meta->magic != HOSTAP_SKB_TX_DATA_MAGIC) {
521 printk(KERN_DEBUG "%s: invalid skb->cb magic (0x%08x, "
522 "expected 0x%08x) after hostap_tx_encrypt\n",
523 dev->name, meta->magic,
524 HOSTAP_SKB_TX_DATA_MAGIC);
526 iface->stats.tx_dropped++;
531 if (local->func->tx == NULL || local->func->tx(skb, dev)) {
533 iface->stats.tx_dropped++;
536 iface->stats.tx_packets++;
537 iface->stats.tx_bytes += skb->len;
541 if (ret == NETDEV_TX_OK && skb)
545 hostap_handle_sta_release(tx.sta_ptr);
550 EXPORT_SYMBOL(hostap_master_start_xmit);