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 int hostap_data_start_xmit(struct sk_buff *skb, struct net_device *dev)
58 struct hostap_interface *iface;
60 int need_headroom, need_tailroom = 0;
61 struct ieee80211_hdr hdr;
62 u16 fc, ethertype = 0;
64 WDS_NO = 0, WDS_OWN_FRAME, WDS_COMPLIANT_FRAME
67 int hdr_len, encaps_len, skip_header_bytes;
69 struct hostap_skb_tx_data *meta;
71 iface = netdev_priv(dev);
74 if (skb->len < ETH_HLEN) {
75 printk(KERN_DEBUG "%s: hostap_data_start_xmit: short skb "
76 "(len=%d)\n", dev->name, skb->len);
81 if (local->ddev != dev) {
82 use_wds = (local->iw_mode == IW_MODE_MASTER &&
83 !(local->wds_type & HOSTAP_WDS_STANDARD_FRAME)) ?
84 WDS_OWN_FRAME : WDS_COMPLIANT_FRAME;
85 if (dev == local->stadev) {
88 } else if (dev == local->apdev) {
89 printk(KERN_DEBUG "%s: prism2_tx: trying to use "
90 "AP device with Ethernet net dev\n", dev->name);
95 if (local->iw_mode == IW_MODE_REPEAT) {
96 printk(KERN_DEBUG "%s: prism2_tx: trying to use "
97 "non-WDS link in Repeater mode\n", dev->name);
100 } else if (local->iw_mode == IW_MODE_INFRA &&
101 (local->wds_type & HOSTAP_WDS_AP_CLIENT) &&
102 memcmp(skb->data + ETH_ALEN, dev->dev_addr,
104 /* AP client mode: send frames with foreign src addr
105 * using 4-addr WDS frames */
106 use_wds = WDS_COMPLIANT_FRAME;
110 /* Incoming skb->data: dst_addr[6], src_addr[6], proto[2], payload
112 * Prism2 TX frame with 802.11 header:
113 * txdesc (address order depending on used mode; includes dst_addr and
114 * src_addr), possible encapsulation (RFC1042/Bridge-Tunnel;
115 * proto[2], payload {, possible addr4[6]} */
117 ethertype = (skb->data[12] << 8) | skb->data[13];
119 memset(&hdr, 0, sizeof(hdr));
121 /* Length of data after IEEE 802.11 header */
124 skip_header_bytes = ETH_HLEN;
125 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
126 encaps_data = bridge_tunnel_header;
127 encaps_len = sizeof(bridge_tunnel_header);
128 skip_header_bytes -= 2;
129 } else if (ethertype >= 0x600) {
130 encaps_data = rfc1042_header;
131 encaps_len = sizeof(rfc1042_header);
132 skip_header_bytes -= 2;
135 fc = IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA;
136 hdr_len = IEEE80211_DATA_HDR3_LEN;
138 if (use_wds != WDS_NO) {
139 /* Note! Prism2 station firmware has problems with sending real
140 * 802.11 frames with four addresses; until these problems can
141 * be fixed or worked around, 4-addr frames needed for WDS are
142 * using incompatible format: FromDS flag is not set and the
143 * fourth address is added after the frame payload; it is
144 * assumed, that the receiving station knows how to handle this
147 if (use_wds == WDS_COMPLIANT_FRAME) {
148 fc |= IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS;
149 /* From&To DS: Addr1 = RA, Addr2 = TA, Addr3 = DA,
151 skb_copy_from_linear_data_offset(skb, ETH_ALEN,
152 &hdr.addr4, ETH_ALEN);
155 /* bogus 4-addr format to workaround Prism2 station
157 fc |= IEEE80211_FCTL_TODS;
158 /* From DS: Addr1 = DA (used as RA),
159 * Addr2 = BSSID (used as TA), Addr3 = SA (used as DA),
162 /* SA from skb->data + ETH_ALEN will be added after
163 * frame payload; use hdr.addr4 as a temporary buffer
165 skb_copy_from_linear_data_offset(skb, ETH_ALEN,
166 &hdr.addr4, ETH_ALEN);
167 need_tailroom += ETH_ALEN;
170 /* send broadcast and multicast frames to broadcast RA, if
171 * configured; otherwise, use unicast RA of the WDS link */
172 if ((local->wds_type & HOSTAP_WDS_BROADCAST_RA) &&
174 memset(&hdr.addr1, 0xff, ETH_ALEN);
175 else if (iface->type == HOSTAP_INTERFACE_WDS)
176 memcpy(&hdr.addr1, iface->u.wds.remote_addr,
179 memcpy(&hdr.addr1, local->bssid, ETH_ALEN);
180 memcpy(&hdr.addr2, dev->dev_addr, ETH_ALEN);
181 skb_copy_from_linear_data(skb, &hdr.addr3, ETH_ALEN);
182 } else if (local->iw_mode == IW_MODE_MASTER && !to_assoc_ap) {
183 fc |= IEEE80211_FCTL_FROMDS;
184 /* From DS: Addr1 = DA, Addr2 = BSSID, Addr3 = SA */
185 skb_copy_from_linear_data(skb, &hdr.addr1, ETH_ALEN);
186 memcpy(&hdr.addr2, dev->dev_addr, ETH_ALEN);
187 skb_copy_from_linear_data_offset(skb, ETH_ALEN, &hdr.addr3,
189 } else if (local->iw_mode == IW_MODE_INFRA || to_assoc_ap) {
190 fc |= IEEE80211_FCTL_TODS;
191 /* To DS: Addr1 = BSSID, Addr2 = SA, Addr3 = DA */
192 memcpy(&hdr.addr1, to_assoc_ap ?
193 local->assoc_ap_addr : local->bssid, ETH_ALEN);
194 skb_copy_from_linear_data_offset(skb, ETH_ALEN, &hdr.addr2,
196 skb_copy_from_linear_data(skb, &hdr.addr3, ETH_ALEN);
197 } else if (local->iw_mode == IW_MODE_ADHOC) {
198 /* not From/To DS: Addr1 = DA, Addr2 = SA, Addr3 = BSSID */
199 skb_copy_from_linear_data(skb, &hdr.addr1, ETH_ALEN);
200 skb_copy_from_linear_data_offset(skb, ETH_ALEN, &hdr.addr2,
202 memcpy(&hdr.addr3, local->bssid, ETH_ALEN);
205 hdr.frame_control = cpu_to_le16(fc);
207 skb_pull(skb, skip_header_bytes);
208 need_headroom = local->func->need_tx_headroom + hdr_len + encaps_len;
209 if (skb_tailroom(skb) < need_tailroom) {
210 skb = skb_unshare(skb, GFP_ATOMIC);
212 iface->stats.tx_dropped++;
215 if (pskb_expand_head(skb, need_headroom, need_tailroom,
218 iface->stats.tx_dropped++;
221 } else if (skb_headroom(skb) < need_headroom) {
222 struct sk_buff *tmp = skb;
223 skb = skb_realloc_headroom(skb, need_headroom);
226 iface->stats.tx_dropped++;
230 skb = skb_unshare(skb, GFP_ATOMIC);
232 iface->stats.tx_dropped++;
238 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
239 memcpy(skb_push(skb, hdr_len), &hdr, hdr_len);
240 if (use_wds == WDS_OWN_FRAME) {
241 memcpy(skb_put(skb, ETH_ALEN), &hdr.addr4, ETH_ALEN);
244 iface->stats.tx_packets++;
245 iface->stats.tx_bytes += skb->len;
247 skb_reset_mac_header(skb);
248 meta = (struct hostap_skb_tx_data *) skb->cb;
249 memset(meta, 0, sizeof(*meta));
250 meta->magic = HOSTAP_SKB_TX_DATA_MAGIC;
252 meta->flags |= HOSTAP_TX_FLAGS_WDS;
253 meta->ethertype = ethertype;
256 /* Send IEEE 802.11 encapsulated frame using the master radio device */
257 skb->dev = local->dev;
263 /* hard_start_xmit function for hostapd wlan#ap interfaces */
264 int hostap_mgmt_start_xmit(struct sk_buff *skb, struct net_device *dev)
266 struct hostap_interface *iface;
268 struct hostap_skb_tx_data *meta;
269 struct ieee80211_hdr *hdr;
272 iface = netdev_priv(dev);
273 local = iface->local;
276 printk(KERN_DEBUG "%s: hostap_mgmt_start_xmit: short skb "
277 "(len=%d)\n", dev->name, skb->len);
282 iface->stats.tx_packets++;
283 iface->stats.tx_bytes += skb->len;
285 meta = (struct hostap_skb_tx_data *) skb->cb;
286 memset(meta, 0, sizeof(*meta));
287 meta->magic = HOSTAP_SKB_TX_DATA_MAGIC;
290 if (skb->len >= IEEE80211_DATA_HDR3_LEN + sizeof(rfc1042_header) + 2) {
291 hdr = (struct ieee80211_hdr *) skb->data;
292 fc = le16_to_cpu(hdr->frame_control);
293 if (ieee80211_is_data(hdr->frame_control) &&
294 (fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_DATA) {
295 u8 *pos = &skb->data[IEEE80211_DATA_HDR3_LEN +
296 sizeof(rfc1042_header)];
297 meta->ethertype = (pos[0] << 8) | pos[1];
301 /* Send IEEE 802.11 encapsulated frame using the master radio device */
302 skb->dev = local->dev;
308 /* Called only from software IRQ */
309 static struct sk_buff * hostap_tx_encrypt(struct sk_buff *skb,
310 struct lib80211_crypt_data *crypt)
312 struct hostap_interface *iface;
314 struct ieee80211_hdr *hdr;
315 int prefix_len, postfix_len, hdr_len, res;
317 iface = netdev_priv(skb->dev);
318 local = iface->local;
320 if (skb->len < IEEE80211_DATA_HDR3_LEN) {
325 if (local->tkip_countermeasures &&
326 strcmp(crypt->ops->name, "TKIP") == 0) {
327 hdr = (struct ieee80211_hdr *) skb->data;
328 if (net_ratelimit()) {
329 printk(KERN_DEBUG "%s: TKIP countermeasures: dropped "
330 "TX packet to %pM\n",
331 local->dev->name, hdr->addr1);
337 skb = skb_unshare(skb, GFP_ATOMIC);
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)) {
352 hdr = (struct ieee80211_hdr *) skb->data;
353 hdr_len = hostap_80211_get_hdrlen(hdr->frame_control);
355 /* Host-based IEEE 802.11 fragmentation for TX is not yet supported, so
356 * call both MSDU and MPDU encryption functions from here. */
357 atomic_inc(&crypt->refcnt);
359 if (crypt->ops->encrypt_msdu)
360 res = crypt->ops->encrypt_msdu(skb, hdr_len, crypt->priv);
361 if (res == 0 && crypt->ops->encrypt_mpdu)
362 res = crypt->ops->encrypt_mpdu(skb, hdr_len, crypt->priv);
363 atomic_dec(&crypt->refcnt);
373 /* hard_start_xmit function for master radio interface wifi#.
374 * AP processing (TX rate control, power save buffering, etc.).
375 * Use hardware TX function to send the frame. */
376 int hostap_master_start_xmit(struct sk_buff *skb, struct net_device *dev)
378 struct hostap_interface *iface;
380 int ret = NETDEV_TX_BUSY;
382 struct hostap_tx_data tx;
384 struct hostap_skb_tx_data *meta;
386 struct ieee80211_hdr *hdr;
388 iface = netdev_priv(dev);
389 local = iface->local;
394 meta = (struct hostap_skb_tx_data *) skb->cb;
395 if (meta->magic != HOSTAP_SKB_TX_DATA_MAGIC) {
396 printk(KERN_DEBUG "%s: invalid skb->cb magic (0x%08x, "
397 "expected 0x%08x)\n",
398 dev->name, meta->magic, HOSTAP_SKB_TX_DATA_MAGIC);
400 iface->stats.tx_dropped++;
404 if (local->host_encrypt) {
405 /* Set crypt to default algorithm and key; will be replaced in
406 * AP code if STA has own alg/key */
407 tx.crypt = local->crypt_info.crypt[local->crypt_info.tx_keyidx];
415 printk(KERN_DEBUG "%s: hostap_master_start_xmit: short skb "
416 "(len=%d)\n", dev->name, skb->len);
418 iface->stats.tx_dropped++;
423 * Wi-Fi 802.11b test plan suggests that AP should ignore power save
424 * bit in authentication and (re)association frames and assume tha
425 * STA remains awake for the response. */
426 tx_ret = hostap_handle_sta_tx(local, &tx);
428 meta = (struct hostap_skb_tx_data *) skb->cb;
429 hdr = (struct ieee80211_hdr *) skb->data;
430 fc = le16_to_cpu(hdr->frame_control);
434 case AP_TX_CONTINUE_NOT_AUTHORIZED:
435 if (local->ieee_802_1x &&
436 ieee80211_is_data(hdr->frame_control) &&
437 meta->ethertype != ETH_P_PAE &&
438 !(meta->flags & HOSTAP_TX_FLAGS_WDS)) {
439 printk(KERN_DEBUG "%s: dropped frame to unauthorized "
440 "port (IEEE 802.1X): ethertype=0x%04x\n",
441 dev->name, meta->ethertype);
442 hostap_dump_tx_80211(dev->name, skb);
444 ret = NETDEV_TX_OK; /* drop packet */
445 iface->stats.tx_dropped++;
450 ret = NETDEV_TX_OK; /* drop packet */
451 iface->stats.tx_dropped++;
456 /* do not free skb here, it will be freed when the
457 * buffered frame is sent/timed out */
462 /* Request TX callback if protocol version is 2 in 802.11 header;
463 * this version 2 is a special case used between hostapd and kernel
465 if (((fc & IEEE80211_FCTL_VERS) == BIT(1)) &&
466 local->ap && local->ap->tx_callback_idx && meta->tx_cb_idx == 0) {
467 meta->tx_cb_idx = local->ap->tx_callback_idx;
469 /* remove special version from the frame header */
470 fc &= ~IEEE80211_FCTL_VERS;
471 hdr->frame_control = cpu_to_le16(fc);
474 if (!ieee80211_is_data(hdr->frame_control)) {
479 if (local->ieee_802_1x && meta->ethertype == ETH_P_PAE && tx.crypt &&
480 !(fc & IEEE80211_FCTL_PROTECTED)) {
482 PDEBUG(DEBUG_EXTRA2, "%s: TX: IEEE 802.1X - passing "
483 "unencrypted EAPOL frame\n", dev->name);
484 tx.crypt = NULL; /* no encryption for IEEE 802.1X frames */
487 if (tx.crypt && (!tx.crypt->ops || !tx.crypt->ops->encrypt_mpdu))
489 else if ((tx.crypt ||
490 local->crypt_info.crypt[local->crypt_info.tx_keyidx]) &&
492 /* Add ISWEP flag both for firmware and host based encryption
494 fc |= IEEE80211_FCTL_PROTECTED;
495 hdr->frame_control = cpu_to_le16(fc);
496 } else if (local->drop_unencrypted &&
497 ieee80211_is_data(hdr->frame_control) &&
498 meta->ethertype != ETH_P_PAE) {
499 if (net_ratelimit()) {
500 printk(KERN_DEBUG "%s: dropped unencrypted TX data "
501 "frame (drop_unencrypted=1)\n", dev->name);
503 iface->stats.tx_dropped++;
509 skb = hostap_tx_encrypt(skb, tx.crypt);
511 printk(KERN_DEBUG "%s: TX - encryption failed\n",
516 meta = (struct hostap_skb_tx_data *) skb->cb;
517 if (meta->magic != HOSTAP_SKB_TX_DATA_MAGIC) {
518 printk(KERN_DEBUG "%s: invalid skb->cb magic (0x%08x, "
519 "expected 0x%08x) after hostap_tx_encrypt\n",
520 dev->name, meta->magic,
521 HOSTAP_SKB_TX_DATA_MAGIC);
523 iface->stats.tx_dropped++;
528 if (local->func->tx == NULL || local->func->tx(skb, dev)) {
530 iface->stats.tx_dropped++;
533 iface->stats.tx_packets++;
534 iface->stats.tx_bytes += skb->len;
538 if (ret == NETDEV_TX_OK && skb)
542 hostap_handle_sta_release(tx.sta_ptr);
547 EXPORT_SYMBOL(hostap_master_start_xmit);