2 * Wireless utility functions
4 * Copyright 2007-2009 Johannes Berg <johannes@sipsolutions.net>
6 #include <linux/export.h>
7 #include <linux/bitops.h>
8 #include <linux/etherdevice.h>
9 #include <linux/slab.h>
10 #include <net/cfg80211.h>
14 struct ieee80211_rate *
15 ieee80211_get_response_rate(struct ieee80211_supported_band *sband,
16 u32 basic_rates, int bitrate)
18 struct ieee80211_rate *result = &sband->bitrates[0];
21 for (i = 0; i < sband->n_bitrates; i++) {
22 if (!(basic_rates & BIT(i)))
24 if (sband->bitrates[i].bitrate > bitrate)
26 result = &sband->bitrates[i];
31 EXPORT_SYMBOL(ieee80211_get_response_rate);
33 int ieee80211_channel_to_frequency(int chan, enum ieee80211_band band)
35 /* see 802.11 17.3.8.3.2 and Annex J
36 * there are overlapping channel numbers in 5GHz and 2GHz bands */
37 if (band == IEEE80211_BAND_5GHZ) {
38 if (chan >= 182 && chan <= 196)
39 return 4000 + chan * 5;
41 return 5000 + chan * 5;
42 } else { /* IEEE80211_BAND_2GHZ */
46 return 2407 + chan * 5;
48 return 0; /* not supported */
51 EXPORT_SYMBOL(ieee80211_channel_to_frequency);
53 int ieee80211_frequency_to_channel(int freq)
55 /* see 802.11 17.3.8.3.2 and Annex J */
59 return (freq - 2407) / 5;
60 else if (freq >= 4910 && freq <= 4980)
61 return (freq - 4000) / 5;
63 return (freq - 5000) / 5;
65 EXPORT_SYMBOL(ieee80211_frequency_to_channel);
67 struct ieee80211_channel *__ieee80211_get_channel(struct wiphy *wiphy,
70 enum ieee80211_band band;
71 struct ieee80211_supported_band *sband;
74 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
75 sband = wiphy->bands[band];
80 for (i = 0; i < sband->n_channels; i++) {
81 if (sband->channels[i].center_freq == freq)
82 return &sband->channels[i];
88 EXPORT_SYMBOL(__ieee80211_get_channel);
90 static void set_mandatory_flags_band(struct ieee80211_supported_band *sband,
91 enum ieee80211_band band)
96 case IEEE80211_BAND_5GHZ:
98 for (i = 0; i < sband->n_bitrates; i++) {
99 if (sband->bitrates[i].bitrate == 60 ||
100 sband->bitrates[i].bitrate == 120 ||
101 sband->bitrates[i].bitrate == 240) {
102 sband->bitrates[i].flags |=
103 IEEE80211_RATE_MANDATORY_A;
109 case IEEE80211_BAND_2GHZ:
111 for (i = 0; i < sband->n_bitrates; i++) {
112 if (sband->bitrates[i].bitrate == 10) {
113 sband->bitrates[i].flags |=
114 IEEE80211_RATE_MANDATORY_B |
115 IEEE80211_RATE_MANDATORY_G;
119 if (sband->bitrates[i].bitrate == 20 ||
120 sband->bitrates[i].bitrate == 55 ||
121 sband->bitrates[i].bitrate == 110 ||
122 sband->bitrates[i].bitrate == 60 ||
123 sband->bitrates[i].bitrate == 120 ||
124 sband->bitrates[i].bitrate == 240) {
125 sband->bitrates[i].flags |=
126 IEEE80211_RATE_MANDATORY_G;
130 if (sband->bitrates[i].bitrate != 10 &&
131 sband->bitrates[i].bitrate != 20 &&
132 sband->bitrates[i].bitrate != 55 &&
133 sband->bitrates[i].bitrate != 110)
134 sband->bitrates[i].flags |=
135 IEEE80211_RATE_ERP_G;
137 WARN_ON(want != 0 && want != 3 && want != 6);
139 case IEEE80211_NUM_BANDS:
145 void ieee80211_set_bitrate_flags(struct wiphy *wiphy)
147 enum ieee80211_band band;
149 for (band = 0; band < IEEE80211_NUM_BANDS; band++)
150 if (wiphy->bands[band])
151 set_mandatory_flags_band(wiphy->bands[band], band);
154 bool cfg80211_supported_cipher_suite(struct wiphy *wiphy, u32 cipher)
157 for (i = 0; i < wiphy->n_cipher_suites; i++)
158 if (cipher == wiphy->cipher_suites[i])
163 int cfg80211_validate_key_settings(struct cfg80211_registered_device *rdev,
164 struct key_params *params, int key_idx,
165 bool pairwise, const u8 *mac_addr)
170 if (!pairwise && mac_addr && !(rdev->wiphy.flags & WIPHY_FLAG_IBSS_RSN))
173 if (pairwise && !mac_addr)
177 * Disallow pairwise keys with non-zero index unless it's WEP
178 * or a vendor specific cipher (because current deployments use
179 * pairwise WEP keys with non-zero indices and for vendor specific
180 * ciphers this should be validated in the driver or hardware level
181 * - but 802.11i clearly specifies to use zero)
183 if (pairwise && key_idx &&
184 ((params->cipher == WLAN_CIPHER_SUITE_TKIP) ||
185 (params->cipher == WLAN_CIPHER_SUITE_CCMP) ||
186 (params->cipher == WLAN_CIPHER_SUITE_AES_CMAC)))
189 switch (params->cipher) {
190 case WLAN_CIPHER_SUITE_WEP40:
191 if (params->key_len != WLAN_KEY_LEN_WEP40)
194 case WLAN_CIPHER_SUITE_TKIP:
195 if (params->key_len != WLAN_KEY_LEN_TKIP)
198 case WLAN_CIPHER_SUITE_CCMP:
199 if (params->key_len != WLAN_KEY_LEN_CCMP)
202 case WLAN_CIPHER_SUITE_WEP104:
203 if (params->key_len != WLAN_KEY_LEN_WEP104)
206 case WLAN_CIPHER_SUITE_AES_CMAC:
207 if (params->key_len != WLAN_KEY_LEN_AES_CMAC)
212 * We don't know anything about this algorithm,
213 * allow using it -- but the driver must check
214 * all parameters! We still check below whether
215 * or not the driver supports this algorithm,
222 switch (params->cipher) {
223 case WLAN_CIPHER_SUITE_WEP40:
224 case WLAN_CIPHER_SUITE_WEP104:
225 /* These ciphers do not use key sequence */
227 case WLAN_CIPHER_SUITE_TKIP:
228 case WLAN_CIPHER_SUITE_CCMP:
229 case WLAN_CIPHER_SUITE_AES_CMAC:
230 if (params->seq_len != 6)
236 if (!cfg80211_supported_cipher_suite(&rdev->wiphy, params->cipher))
242 unsigned int __attribute_const__ ieee80211_hdrlen(__le16 fc)
244 unsigned int hdrlen = 24;
246 if (ieee80211_is_data(fc)) {
247 if (ieee80211_has_a4(fc))
249 if (ieee80211_is_data_qos(fc)) {
250 hdrlen += IEEE80211_QOS_CTL_LEN;
251 if (ieee80211_has_order(fc))
252 hdrlen += IEEE80211_HT_CTL_LEN;
257 if (ieee80211_is_ctl(fc)) {
259 * ACK and CTS are 10 bytes, all others 16. To see how
260 * to get this condition consider
261 * subtype mask: 0b0000000011110000 (0x00F0)
262 * ACK subtype: 0b0000000011010000 (0x00D0)
263 * CTS subtype: 0b0000000011000000 (0x00C0)
264 * bits that matter: ^^^ (0x00E0)
265 * value of those: 0b0000000011000000 (0x00C0)
267 if ((fc & cpu_to_le16(0x00E0)) == cpu_to_le16(0x00C0))
275 EXPORT_SYMBOL(ieee80211_hdrlen);
277 unsigned int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb)
279 const struct ieee80211_hdr *hdr =
280 (const struct ieee80211_hdr *)skb->data;
283 if (unlikely(skb->len < 10))
285 hdrlen = ieee80211_hdrlen(hdr->frame_control);
286 if (unlikely(hdrlen > skb->len))
290 EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb);
292 static int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr)
294 int ae = meshhdr->flags & MESH_FLAGS_AE;
299 case MESH_FLAGS_AE_A4:
301 case MESH_FLAGS_AE_A5_A6:
303 case (MESH_FLAGS_AE_A4 | MESH_FLAGS_AE_A5_A6):
310 int ieee80211_data_to_8023(struct sk_buff *skb, const u8 *addr,
311 enum nl80211_iftype iftype)
313 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
314 u16 hdrlen, ethertype;
317 u8 src[ETH_ALEN] __aligned(2);
319 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
322 hdrlen = ieee80211_hdrlen(hdr->frame_control);
324 /* convert IEEE 802.11 header + possible LLC headers into Ethernet
326 * IEEE 802.11 address fields:
327 * ToDS FromDS Addr1 Addr2 Addr3 Addr4
328 * 0 0 DA SA BSSID n/a
329 * 0 1 DA BSSID SA n/a
330 * 1 0 BSSID SA DA n/a
333 memcpy(dst, ieee80211_get_DA(hdr), ETH_ALEN);
334 memcpy(src, ieee80211_get_SA(hdr), ETH_ALEN);
336 switch (hdr->frame_control &
337 cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
338 case cpu_to_le16(IEEE80211_FCTL_TODS):
339 if (unlikely(iftype != NL80211_IFTYPE_AP &&
340 iftype != NL80211_IFTYPE_AP_VLAN &&
341 iftype != NL80211_IFTYPE_P2P_GO))
344 case cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
345 if (unlikely(iftype != NL80211_IFTYPE_WDS &&
346 iftype != NL80211_IFTYPE_MESH_POINT &&
347 iftype != NL80211_IFTYPE_AP_VLAN &&
348 iftype != NL80211_IFTYPE_STATION))
350 if (iftype == NL80211_IFTYPE_MESH_POINT) {
351 struct ieee80211s_hdr *meshdr =
352 (struct ieee80211s_hdr *) (skb->data + hdrlen);
353 /* make sure meshdr->flags is on the linear part */
354 if (!pskb_may_pull(skb, hdrlen + 1))
356 if (meshdr->flags & MESH_FLAGS_AE_A5_A6) {
357 skb_copy_bits(skb, hdrlen +
358 offsetof(struct ieee80211s_hdr, eaddr1),
360 skb_copy_bits(skb, hdrlen +
361 offsetof(struct ieee80211s_hdr, eaddr2),
364 hdrlen += ieee80211_get_mesh_hdrlen(meshdr);
367 case cpu_to_le16(IEEE80211_FCTL_FROMDS):
368 if ((iftype != NL80211_IFTYPE_STATION &&
369 iftype != NL80211_IFTYPE_P2P_CLIENT &&
370 iftype != NL80211_IFTYPE_MESH_POINT) ||
371 (is_multicast_ether_addr(dst) &&
372 !compare_ether_addr(src, addr)))
374 if (iftype == NL80211_IFTYPE_MESH_POINT) {
375 struct ieee80211s_hdr *meshdr =
376 (struct ieee80211s_hdr *) (skb->data + hdrlen);
377 /* make sure meshdr->flags is on the linear part */
378 if (!pskb_may_pull(skb, hdrlen + 1))
380 if (meshdr->flags & MESH_FLAGS_AE_A4)
381 skb_copy_bits(skb, hdrlen +
382 offsetof(struct ieee80211s_hdr, eaddr1),
384 hdrlen += ieee80211_get_mesh_hdrlen(meshdr);
388 if (iftype != NL80211_IFTYPE_ADHOC &&
389 iftype != NL80211_IFTYPE_STATION)
394 if (!pskb_may_pull(skb, hdrlen + 8))
397 payload = skb->data + hdrlen;
398 ethertype = (payload[6] << 8) | payload[7];
400 if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
401 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
402 compare_ether_addr(payload, bridge_tunnel_header) == 0)) {
403 /* remove RFC1042 or Bridge-Tunnel encapsulation and
404 * replace EtherType */
405 skb_pull(skb, hdrlen + 6);
406 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
407 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
412 skb_pull(skb, hdrlen);
413 len = htons(skb->len);
414 ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr));
415 memcpy(ehdr->h_dest, dst, ETH_ALEN);
416 memcpy(ehdr->h_source, src, ETH_ALEN);
421 EXPORT_SYMBOL(ieee80211_data_to_8023);
423 int ieee80211_data_from_8023(struct sk_buff *skb, const u8 *addr,
424 enum nl80211_iftype iftype, u8 *bssid, bool qos)
426 struct ieee80211_hdr hdr;
427 u16 hdrlen, ethertype;
429 const u8 *encaps_data;
430 int encaps_len, skip_header_bytes;
434 if (unlikely(skb->len < ETH_HLEN))
437 nh_pos = skb_network_header(skb) - skb->data;
438 h_pos = skb_transport_header(skb) - skb->data;
440 /* convert Ethernet header to proper 802.11 header (based on
442 ethertype = (skb->data[12] << 8) | skb->data[13];
443 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
446 case NL80211_IFTYPE_AP:
447 case NL80211_IFTYPE_AP_VLAN:
448 case NL80211_IFTYPE_P2P_GO:
449 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
451 memcpy(hdr.addr1, skb->data, ETH_ALEN);
452 memcpy(hdr.addr2, addr, ETH_ALEN);
453 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
456 case NL80211_IFTYPE_STATION:
457 case NL80211_IFTYPE_P2P_CLIENT:
458 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
460 memcpy(hdr.addr1, bssid, ETH_ALEN);
461 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
462 memcpy(hdr.addr3, skb->data, ETH_ALEN);
465 case NL80211_IFTYPE_ADHOC:
467 memcpy(hdr.addr1, skb->data, ETH_ALEN);
468 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
469 memcpy(hdr.addr3, bssid, ETH_ALEN);
477 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
481 hdr.frame_control = fc;
485 skip_header_bytes = ETH_HLEN;
486 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
487 encaps_data = bridge_tunnel_header;
488 encaps_len = sizeof(bridge_tunnel_header);
489 skip_header_bytes -= 2;
490 } else if (ethertype > 0x600) {
491 encaps_data = rfc1042_header;
492 encaps_len = sizeof(rfc1042_header);
493 skip_header_bytes -= 2;
499 skb_pull(skb, skip_header_bytes);
500 nh_pos -= skip_header_bytes;
501 h_pos -= skip_header_bytes;
503 head_need = hdrlen + encaps_len - skb_headroom(skb);
505 if (head_need > 0 || skb_cloned(skb)) {
506 head_need = max(head_need, 0);
510 if (pskb_expand_head(skb, head_need, 0, GFP_ATOMIC))
513 skb->truesize += head_need;
517 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
518 nh_pos += encaps_len;
522 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
527 /* Update skb pointers to various headers since this modified frame
528 * is going to go through Linux networking code that may potentially
529 * need things like pointer to IP header. */
530 skb_set_mac_header(skb, 0);
531 skb_set_network_header(skb, nh_pos);
532 skb_set_transport_header(skb, h_pos);
536 EXPORT_SYMBOL(ieee80211_data_from_8023);
539 void ieee80211_amsdu_to_8023s(struct sk_buff *skb, struct sk_buff_head *list,
540 const u8 *addr, enum nl80211_iftype iftype,
541 const unsigned int extra_headroom,
542 bool has_80211_header)
544 struct sk_buff *frame = NULL;
547 const struct ethhdr *eth;
549 u8 dst[ETH_ALEN], src[ETH_ALEN];
551 if (has_80211_header) {
552 err = ieee80211_data_to_8023(skb, addr, iftype);
556 /* skip the wrapping header */
557 eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr));
561 eth = (struct ethhdr *) skb->data;
564 while (skb != frame) {
566 __be16 len = eth->h_proto;
567 unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len);
569 remaining = skb->len;
570 memcpy(dst, eth->h_dest, ETH_ALEN);
571 memcpy(src, eth->h_source, ETH_ALEN);
573 padding = (4 - subframe_len) & 0x3;
574 /* the last MSDU has no padding */
575 if (subframe_len > remaining)
578 skb_pull(skb, sizeof(struct ethhdr));
579 /* reuse skb for the last subframe */
580 if (remaining <= subframe_len + padding)
583 unsigned int hlen = ALIGN(extra_headroom, 4);
585 * Allocate and reserve two bytes more for payload
586 * alignment since sizeof(struct ethhdr) is 14.
588 frame = dev_alloc_skb(hlen + subframe_len + 2);
592 skb_reserve(frame, hlen + sizeof(struct ethhdr) + 2);
593 memcpy(skb_put(frame, ntohs(len)), skb->data,
596 eth = (struct ethhdr *)skb_pull(skb, ntohs(len) +
599 dev_kfree_skb(frame);
604 skb_reset_network_header(frame);
605 frame->dev = skb->dev;
606 frame->priority = skb->priority;
608 payload = frame->data;
609 ethertype = (payload[6] << 8) | payload[7];
611 if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
612 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
613 compare_ether_addr(payload,
614 bridge_tunnel_header) == 0)) {
615 /* remove RFC1042 or Bridge-Tunnel
616 * encapsulation and replace EtherType */
618 memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
619 memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
621 memcpy(skb_push(frame, sizeof(__be16)), &len,
623 memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
624 memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
626 __skb_queue_tail(list, frame);
632 __skb_queue_purge(list);
636 EXPORT_SYMBOL(ieee80211_amsdu_to_8023s);
638 /* Given a data frame determine the 802.1p/1d tag to use. */
639 unsigned int cfg80211_classify8021d(struct sk_buff *skb)
643 /* skb->priority values from 256->263 are magic values to
644 * directly indicate a specific 802.1d priority. This is used
645 * to allow 802.1d priority to be passed directly in from VLAN
648 if (skb->priority >= 256 && skb->priority <= 263)
649 return skb->priority - 256;
651 switch (skb->protocol) {
652 case htons(ETH_P_IP):
653 dscp = ip_hdr(skb)->tos & 0xfc;
661 EXPORT_SYMBOL(cfg80211_classify8021d);
663 const u8 *ieee80211_bss_get_ie(struct cfg80211_bss *bss, u8 ie)
667 pos = bss->information_elements;
670 end = pos + bss->len_information_elements;
672 while (pos + 1 < end) {
673 if (pos + 2 + pos[1] > end)
682 EXPORT_SYMBOL(ieee80211_bss_get_ie);
684 void cfg80211_upload_connect_keys(struct wireless_dev *wdev)
686 struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
687 struct net_device *dev = wdev->netdev;
690 if (!wdev->connect_keys)
693 for (i = 0; i < 6; i++) {
694 if (!wdev->connect_keys->params[i].cipher)
696 if (rdev->ops->add_key(wdev->wiphy, dev, i, false, NULL,
697 &wdev->connect_keys->params[i])) {
698 netdev_err(dev, "failed to set key %d\n", i);
701 if (wdev->connect_keys->def == i)
702 if (rdev->ops->set_default_key(wdev->wiphy, dev,
704 netdev_err(dev, "failed to set defkey %d\n", i);
707 if (wdev->connect_keys->defmgmt == i)
708 if (rdev->ops->set_default_mgmt_key(wdev->wiphy, dev, i))
709 netdev_err(dev, "failed to set mgtdef %d\n", i);
712 kfree(wdev->connect_keys);
713 wdev->connect_keys = NULL;
716 static void cfg80211_process_wdev_events(struct wireless_dev *wdev)
718 struct cfg80211_event *ev;
720 const u8 *bssid = NULL;
722 spin_lock_irqsave(&wdev->event_lock, flags);
723 while (!list_empty(&wdev->event_list)) {
724 ev = list_first_entry(&wdev->event_list,
725 struct cfg80211_event, list);
727 spin_unlock_irqrestore(&wdev->event_lock, flags);
731 case EVENT_CONNECT_RESULT:
732 if (!is_zero_ether_addr(ev->cr.bssid))
733 bssid = ev->cr.bssid;
734 __cfg80211_connect_result(
736 ev->cr.req_ie, ev->cr.req_ie_len,
737 ev->cr.resp_ie, ev->cr.resp_ie_len,
739 ev->cr.status == WLAN_STATUS_SUCCESS,
743 __cfg80211_roamed(wdev, ev->rm.channel, ev->rm.bssid,
744 ev->rm.req_ie, ev->rm.req_ie_len,
745 ev->rm.resp_ie, ev->rm.resp_ie_len);
747 case EVENT_DISCONNECTED:
748 __cfg80211_disconnected(wdev->netdev,
749 ev->dc.ie, ev->dc.ie_len,
750 ev->dc.reason, true);
752 case EVENT_IBSS_JOINED:
753 __cfg80211_ibss_joined(wdev->netdev, ev->ij.bssid);
760 spin_lock_irqsave(&wdev->event_lock, flags);
762 spin_unlock_irqrestore(&wdev->event_lock, flags);
765 void cfg80211_process_rdev_events(struct cfg80211_registered_device *rdev)
767 struct wireless_dev *wdev;
770 ASSERT_RDEV_LOCK(rdev);
772 mutex_lock(&rdev->devlist_mtx);
774 list_for_each_entry(wdev, &rdev->netdev_list, list)
775 cfg80211_process_wdev_events(wdev);
777 mutex_unlock(&rdev->devlist_mtx);
780 int cfg80211_change_iface(struct cfg80211_registered_device *rdev,
781 struct net_device *dev, enum nl80211_iftype ntype,
782 u32 *flags, struct vif_params *params)
785 enum nl80211_iftype otype = dev->ieee80211_ptr->iftype;
787 ASSERT_RDEV_LOCK(rdev);
789 /* don't support changing VLANs, you just re-create them */
790 if (otype == NL80211_IFTYPE_AP_VLAN)
793 if (!rdev->ops->change_virtual_intf ||
794 !(rdev->wiphy.interface_modes & (1 << ntype)))
797 /* if it's part of a bridge, reject changing type to station/ibss */
798 if ((dev->priv_flags & IFF_BRIDGE_PORT) &&
799 (ntype == NL80211_IFTYPE_ADHOC ||
800 ntype == NL80211_IFTYPE_STATION ||
801 ntype == NL80211_IFTYPE_P2P_CLIENT))
804 if (ntype != otype) {
805 err = cfg80211_can_change_interface(rdev, dev->ieee80211_ptr,
810 dev->ieee80211_ptr->use_4addr = false;
811 dev->ieee80211_ptr->mesh_id_up_len = 0;
814 case NL80211_IFTYPE_ADHOC:
815 cfg80211_leave_ibss(rdev, dev, false);
817 case NL80211_IFTYPE_STATION:
818 case NL80211_IFTYPE_P2P_CLIENT:
819 cfg80211_disconnect(rdev, dev,
820 WLAN_REASON_DEAUTH_LEAVING, true);
822 case NL80211_IFTYPE_MESH_POINT:
823 /* mesh should be handled? */
829 cfg80211_process_rdev_events(rdev);
832 err = rdev->ops->change_virtual_intf(&rdev->wiphy, dev,
833 ntype, flags, params);
835 WARN_ON(!err && dev->ieee80211_ptr->iftype != ntype);
837 if (!err && params && params->use_4addr != -1)
838 dev->ieee80211_ptr->use_4addr = params->use_4addr;
841 dev->priv_flags &= ~IFF_DONT_BRIDGE;
843 case NL80211_IFTYPE_STATION:
844 if (dev->ieee80211_ptr->use_4addr)
847 case NL80211_IFTYPE_P2P_CLIENT:
848 case NL80211_IFTYPE_ADHOC:
849 dev->priv_flags |= IFF_DONT_BRIDGE;
851 case NL80211_IFTYPE_P2P_GO:
852 case NL80211_IFTYPE_AP:
853 case NL80211_IFTYPE_AP_VLAN:
854 case NL80211_IFTYPE_WDS:
855 case NL80211_IFTYPE_MESH_POINT:
858 case NL80211_IFTYPE_MONITOR:
859 /* monitor can't bridge anyway */
861 case NL80211_IFTYPE_UNSPECIFIED:
862 case NUM_NL80211_IFTYPES:
871 u16 cfg80211_calculate_bitrate(struct rate_info *rate)
873 int modulation, streams, bitrate;
875 if (!(rate->flags & RATE_INFO_FLAGS_MCS))
878 /* the formula below does only work for MCS values smaller than 32 */
882 modulation = rate->mcs & 7;
883 streams = (rate->mcs >> 3) + 1;
885 bitrate = (rate->flags & RATE_INFO_FLAGS_40_MHZ_WIDTH) ?
889 bitrate *= (modulation + 1);
890 else if (modulation == 4)
891 bitrate *= (modulation + 2);
893 bitrate *= (modulation + 3);
897 if (rate->flags & RATE_INFO_FLAGS_SHORT_GI)
898 bitrate = (bitrate / 9) * 10;
900 /* do NOT round down here */
901 return (bitrate + 50000) / 100000;
904 int cfg80211_validate_beacon_int(struct cfg80211_registered_device *rdev,
907 struct wireless_dev *wdev;
913 mutex_lock(&rdev->devlist_mtx);
915 list_for_each_entry(wdev, &rdev->netdev_list, list) {
916 if (!wdev->beacon_interval)
918 if (wdev->beacon_interval != beacon_int) {
924 mutex_unlock(&rdev->devlist_mtx);
929 int cfg80211_can_change_interface(struct cfg80211_registered_device *rdev,
930 struct wireless_dev *wdev,
931 enum nl80211_iftype iftype)
933 struct wireless_dev *wdev_iter;
934 int num[NUM_NL80211_IFTYPES];
940 /* Always allow software iftypes */
941 if (rdev->wiphy.software_iftypes & BIT(iftype))
945 * Drivers will gradually all set this flag, until all
946 * have it we only enforce for those that set it.
948 if (!(rdev->wiphy.flags & WIPHY_FLAG_ENFORCE_COMBINATIONS))
951 memset(num, 0, sizeof(num));
955 mutex_lock(&rdev->devlist_mtx);
956 list_for_each_entry(wdev_iter, &rdev->netdev_list, list) {
957 if (wdev_iter == wdev)
959 if (!netif_running(wdev_iter->netdev))
962 if (rdev->wiphy.software_iftypes & BIT(wdev_iter->iftype))
965 num[wdev_iter->iftype]++;
968 mutex_unlock(&rdev->devlist_mtx);
970 for (i = 0; i < rdev->wiphy.n_iface_combinations; i++) {
971 const struct ieee80211_iface_combination *c;
972 struct ieee80211_iface_limit *limits;
974 c = &rdev->wiphy.iface_combinations[i];
976 limits = kmemdup(c->limits, sizeof(limits[0]) * c->n_limits,
980 if (total > c->max_interfaces)
983 for (iftype = 0; iftype < NUM_NL80211_IFTYPES; iftype++) {
984 if (rdev->wiphy.software_iftypes & BIT(iftype))
986 for (j = 0; j < c->n_limits; j++) {
987 if (!(limits[j].types & iftype))
989 if (limits[j].max < num[iftype])
991 limits[j].max -= num[iftype];
1004 int ieee80211_get_ratemask(struct ieee80211_supported_band *sband,
1005 const u8 *rates, unsigned int n_rates,
1013 if (n_rates == 0 || n_rates > NL80211_MAX_SUPP_RATES)
1018 for (i = 0; i < n_rates; i++) {
1019 int rate = (rates[i] & 0x7f) * 5;
1022 for (j = 0; j < sband->n_bitrates; j++) {
1023 if (sband->bitrates[j].bitrate == rate) {
1034 * mask must have at least one bit set here since we
1035 * didn't accept a 0-length rates array nor allowed
1036 * entries in the array that didn't exist
1042 /* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
1043 /* Ethernet-II snap header (RFC1042 for most EtherTypes) */
1044 const unsigned char rfc1042_header[] __aligned(2) =
1045 { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
1046 EXPORT_SYMBOL(rfc1042_header);
1048 /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
1049 const unsigned char bridge_tunnel_header[] __aligned(2) =
1050 { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
1051 EXPORT_SYMBOL(bridge_tunnel_header);