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 <linux/crc32.h>
11 #include <net/cfg80211.h>
15 struct ieee80211_rate *
16 ieee80211_get_response_rate(struct ieee80211_supported_band *sband,
17 u32 basic_rates, int bitrate)
19 struct ieee80211_rate *result = &sband->bitrates[0];
22 for (i = 0; i < sband->n_bitrates; i++) {
23 if (!(basic_rates & BIT(i)))
25 if (sband->bitrates[i].bitrate > bitrate)
27 result = &sband->bitrates[i];
32 EXPORT_SYMBOL(ieee80211_get_response_rate);
34 int ieee80211_channel_to_frequency(int chan, enum ieee80211_band band)
36 /* see 802.11 17.3.8.3.2 and Annex J
37 * there are overlapping channel numbers in 5GHz and 2GHz bands */
38 if (band == IEEE80211_BAND_5GHZ) {
39 if (chan >= 182 && chan <= 196)
40 return 4000 + chan * 5;
42 return 5000 + chan * 5;
43 } else { /* IEEE80211_BAND_2GHZ */
47 return 2407 + chan * 5;
49 return 0; /* not supported */
52 EXPORT_SYMBOL(ieee80211_channel_to_frequency);
54 int ieee80211_frequency_to_channel(int freq)
56 /* see 802.11 17.3.8.3.2 and Annex J */
60 return (freq - 2407) / 5;
61 else if (freq >= 4910 && freq <= 4980)
62 return (freq - 4000) / 5;
64 return (freq - 5000) / 5;
66 EXPORT_SYMBOL(ieee80211_frequency_to_channel);
68 struct ieee80211_channel *__ieee80211_get_channel(struct wiphy *wiphy,
71 enum ieee80211_band band;
72 struct ieee80211_supported_band *sband;
75 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
76 sband = wiphy->bands[band];
81 for (i = 0; i < sband->n_channels; i++) {
82 if (sband->channels[i].center_freq == freq)
83 return &sband->channels[i];
89 EXPORT_SYMBOL(__ieee80211_get_channel);
91 static void set_mandatory_flags_band(struct ieee80211_supported_band *sband,
92 enum ieee80211_band band)
97 case IEEE80211_BAND_5GHZ:
99 for (i = 0; i < sband->n_bitrates; i++) {
100 if (sband->bitrates[i].bitrate == 60 ||
101 sband->bitrates[i].bitrate == 120 ||
102 sband->bitrates[i].bitrate == 240) {
103 sband->bitrates[i].flags |=
104 IEEE80211_RATE_MANDATORY_A;
110 case IEEE80211_BAND_2GHZ:
112 for (i = 0; i < sband->n_bitrates; i++) {
113 if (sband->bitrates[i].bitrate == 10) {
114 sband->bitrates[i].flags |=
115 IEEE80211_RATE_MANDATORY_B |
116 IEEE80211_RATE_MANDATORY_G;
120 if (sband->bitrates[i].bitrate == 20 ||
121 sband->bitrates[i].bitrate == 55 ||
122 sband->bitrates[i].bitrate == 110 ||
123 sband->bitrates[i].bitrate == 60 ||
124 sband->bitrates[i].bitrate == 120 ||
125 sband->bitrates[i].bitrate == 240) {
126 sband->bitrates[i].flags |=
127 IEEE80211_RATE_MANDATORY_G;
131 if (sband->bitrates[i].bitrate != 10 &&
132 sband->bitrates[i].bitrate != 20 &&
133 sband->bitrates[i].bitrate != 55 &&
134 sband->bitrates[i].bitrate != 110)
135 sband->bitrates[i].flags |=
136 IEEE80211_RATE_ERP_G;
138 WARN_ON(want != 0 && want != 3 && want != 6);
140 case IEEE80211_NUM_BANDS:
146 void ieee80211_set_bitrate_flags(struct wiphy *wiphy)
148 enum ieee80211_band band;
150 for (band = 0; band < IEEE80211_NUM_BANDS; band++)
151 if (wiphy->bands[band])
152 set_mandatory_flags_band(wiphy->bands[band], band);
155 bool cfg80211_supported_cipher_suite(struct wiphy *wiphy, u32 cipher)
158 for (i = 0; i < wiphy->n_cipher_suites; i++)
159 if (cipher == wiphy->cipher_suites[i])
164 int cfg80211_validate_key_settings(struct cfg80211_registered_device *rdev,
165 struct key_params *params, int key_idx,
166 bool pairwise, const u8 *mac_addr)
171 if (!pairwise && mac_addr && !(rdev->wiphy.flags & WIPHY_FLAG_IBSS_RSN))
174 if (pairwise && !mac_addr)
178 * Disallow pairwise keys with non-zero index unless it's WEP
179 * or a vendor specific cipher (because current deployments use
180 * pairwise WEP keys with non-zero indices and for vendor specific
181 * ciphers this should be validated in the driver or hardware level
182 * - but 802.11i clearly specifies to use zero)
184 if (pairwise && key_idx &&
185 ((params->cipher == WLAN_CIPHER_SUITE_TKIP) ||
186 (params->cipher == WLAN_CIPHER_SUITE_CCMP) ||
187 (params->cipher == WLAN_CIPHER_SUITE_AES_CMAC)))
190 switch (params->cipher) {
191 case WLAN_CIPHER_SUITE_WEP40:
192 if (params->key_len != WLAN_KEY_LEN_WEP40)
195 case WLAN_CIPHER_SUITE_TKIP:
196 if (params->key_len != WLAN_KEY_LEN_TKIP)
199 case WLAN_CIPHER_SUITE_CCMP:
200 if (params->key_len != WLAN_KEY_LEN_CCMP)
203 case WLAN_CIPHER_SUITE_WEP104:
204 if (params->key_len != WLAN_KEY_LEN_WEP104)
207 case WLAN_CIPHER_SUITE_AES_CMAC:
208 if (params->key_len != WLAN_KEY_LEN_AES_CMAC)
213 * We don't know anything about this algorithm,
214 * allow using it -- but the driver must check
215 * all parameters! We still check below whether
216 * or not the driver supports this algorithm,
223 switch (params->cipher) {
224 case WLAN_CIPHER_SUITE_WEP40:
225 case WLAN_CIPHER_SUITE_WEP104:
226 /* These ciphers do not use key sequence */
228 case WLAN_CIPHER_SUITE_TKIP:
229 case WLAN_CIPHER_SUITE_CCMP:
230 case WLAN_CIPHER_SUITE_AES_CMAC:
231 if (params->seq_len != 6)
237 if (!cfg80211_supported_cipher_suite(&rdev->wiphy, params->cipher))
243 /* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
244 /* Ethernet-II snap header (RFC1042 for most EtherTypes) */
245 const unsigned char rfc1042_header[] __aligned(2) =
246 { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
247 EXPORT_SYMBOL(rfc1042_header);
249 /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
250 const unsigned char bridge_tunnel_header[] __aligned(2) =
251 { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
252 EXPORT_SYMBOL(bridge_tunnel_header);
254 unsigned int __attribute_const__ ieee80211_hdrlen(__le16 fc)
256 unsigned int hdrlen = 24;
258 if (ieee80211_is_data(fc)) {
259 if (ieee80211_has_a4(fc))
261 if (ieee80211_is_data_qos(fc)) {
262 hdrlen += IEEE80211_QOS_CTL_LEN;
263 if (ieee80211_has_order(fc))
264 hdrlen += IEEE80211_HT_CTL_LEN;
269 if (ieee80211_is_ctl(fc)) {
271 * ACK and CTS are 10 bytes, all others 16. To see how
272 * to get this condition consider
273 * subtype mask: 0b0000000011110000 (0x00F0)
274 * ACK subtype: 0b0000000011010000 (0x00D0)
275 * CTS subtype: 0b0000000011000000 (0x00C0)
276 * bits that matter: ^^^ (0x00E0)
277 * value of those: 0b0000000011000000 (0x00C0)
279 if ((fc & cpu_to_le16(0x00E0)) == cpu_to_le16(0x00C0))
287 EXPORT_SYMBOL(ieee80211_hdrlen);
289 unsigned int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb)
291 const struct ieee80211_hdr *hdr =
292 (const struct ieee80211_hdr *)skb->data;
295 if (unlikely(skb->len < 10))
297 hdrlen = ieee80211_hdrlen(hdr->frame_control);
298 if (unlikely(hdrlen > skb->len))
302 EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb);
304 unsigned int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr)
306 int ae = meshhdr->flags & MESH_FLAGS_AE;
307 /* 802.11-2012, 8.2.4.7.3 */
312 case MESH_FLAGS_AE_A4:
314 case MESH_FLAGS_AE_A5_A6:
318 EXPORT_SYMBOL(ieee80211_get_mesh_hdrlen);
320 int ieee80211_data_to_8023(struct sk_buff *skb, const u8 *addr,
321 enum nl80211_iftype iftype)
323 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
324 u16 hdrlen, ethertype;
327 u8 src[ETH_ALEN] __aligned(2);
329 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
332 hdrlen = ieee80211_hdrlen(hdr->frame_control);
334 /* convert IEEE 802.11 header + possible LLC headers into Ethernet
336 * IEEE 802.11 address fields:
337 * ToDS FromDS Addr1 Addr2 Addr3 Addr4
338 * 0 0 DA SA BSSID n/a
339 * 0 1 DA BSSID SA n/a
340 * 1 0 BSSID SA DA n/a
343 memcpy(dst, ieee80211_get_DA(hdr), ETH_ALEN);
344 memcpy(src, ieee80211_get_SA(hdr), ETH_ALEN);
346 switch (hdr->frame_control &
347 cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
348 case cpu_to_le16(IEEE80211_FCTL_TODS):
349 if (unlikely(iftype != NL80211_IFTYPE_AP &&
350 iftype != NL80211_IFTYPE_AP_VLAN &&
351 iftype != NL80211_IFTYPE_P2P_GO))
354 case cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
355 if (unlikely(iftype != NL80211_IFTYPE_WDS &&
356 iftype != NL80211_IFTYPE_MESH_POINT &&
357 iftype != NL80211_IFTYPE_AP_VLAN &&
358 iftype != NL80211_IFTYPE_STATION))
360 if (iftype == NL80211_IFTYPE_MESH_POINT) {
361 struct ieee80211s_hdr *meshdr =
362 (struct ieee80211s_hdr *) (skb->data + hdrlen);
365 /* make sure meshdr->flags is on the linear part */
366 if (!pskb_may_pull(skb, hdrlen + 1))
368 mesh_flags = meshdr->flags & MESH_FLAGS_AE;
369 if (mesh_flags == MESH_FLAGS_AE_A4)
371 if (mesh_flags == MESH_FLAGS_AE_A5_A6) {
372 skb_copy_bits(skb, hdrlen +
373 offsetof(struct ieee80211s_hdr, eaddr1),
375 skb_copy_bits(skb, hdrlen +
376 offsetof(struct ieee80211s_hdr, eaddr2),
379 hdrlen += ieee80211_get_mesh_hdrlen(meshdr);
382 case cpu_to_le16(IEEE80211_FCTL_FROMDS):
383 if ((iftype != NL80211_IFTYPE_STATION &&
384 iftype != NL80211_IFTYPE_P2P_CLIENT &&
385 iftype != NL80211_IFTYPE_MESH_POINT) ||
386 (is_multicast_ether_addr(dst) &&
387 !compare_ether_addr(src, addr)))
389 if (iftype == NL80211_IFTYPE_MESH_POINT) {
390 struct ieee80211s_hdr *meshdr =
391 (struct ieee80211s_hdr *) (skb->data + hdrlen);
394 /* make sure meshdr->flags is on the linear part */
395 if (!pskb_may_pull(skb, hdrlen + 1))
397 mesh_flags = meshdr->flags & MESH_FLAGS_AE;
398 if (mesh_flags == MESH_FLAGS_AE_A5_A6)
400 if (mesh_flags == MESH_FLAGS_AE_A4)
401 skb_copy_bits(skb, hdrlen +
402 offsetof(struct ieee80211s_hdr, eaddr1),
404 hdrlen += ieee80211_get_mesh_hdrlen(meshdr);
408 if (iftype != NL80211_IFTYPE_ADHOC &&
409 iftype != NL80211_IFTYPE_STATION)
414 if (!pskb_may_pull(skb, hdrlen + 8))
417 payload = skb->data + hdrlen;
418 ethertype = (payload[6] << 8) | payload[7];
420 if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
421 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
422 compare_ether_addr(payload, bridge_tunnel_header) == 0)) {
423 /* remove RFC1042 or Bridge-Tunnel encapsulation and
424 * replace EtherType */
425 skb_pull(skb, hdrlen + 6);
426 memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
427 memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
432 skb_pull(skb, hdrlen);
433 len = htons(skb->len);
434 ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr));
435 memcpy(ehdr->h_dest, dst, ETH_ALEN);
436 memcpy(ehdr->h_source, src, ETH_ALEN);
441 EXPORT_SYMBOL(ieee80211_data_to_8023);
443 int ieee80211_data_from_8023(struct sk_buff *skb, const u8 *addr,
444 enum nl80211_iftype iftype, u8 *bssid, bool qos)
446 struct ieee80211_hdr hdr;
447 u16 hdrlen, ethertype;
449 const u8 *encaps_data;
450 int encaps_len, skip_header_bytes;
454 if (unlikely(skb->len < ETH_HLEN))
457 nh_pos = skb_network_header(skb) - skb->data;
458 h_pos = skb_transport_header(skb) - skb->data;
460 /* convert Ethernet header to proper 802.11 header (based on
462 ethertype = (skb->data[12] << 8) | skb->data[13];
463 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
466 case NL80211_IFTYPE_AP:
467 case NL80211_IFTYPE_AP_VLAN:
468 case NL80211_IFTYPE_P2P_GO:
469 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
471 memcpy(hdr.addr1, skb->data, ETH_ALEN);
472 memcpy(hdr.addr2, addr, ETH_ALEN);
473 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
476 case NL80211_IFTYPE_STATION:
477 case NL80211_IFTYPE_P2P_CLIENT:
478 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
480 memcpy(hdr.addr1, bssid, ETH_ALEN);
481 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
482 memcpy(hdr.addr3, skb->data, ETH_ALEN);
485 case NL80211_IFTYPE_ADHOC:
487 memcpy(hdr.addr1, skb->data, ETH_ALEN);
488 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
489 memcpy(hdr.addr3, bssid, ETH_ALEN);
497 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
501 hdr.frame_control = fc;
505 skip_header_bytes = ETH_HLEN;
506 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
507 encaps_data = bridge_tunnel_header;
508 encaps_len = sizeof(bridge_tunnel_header);
509 skip_header_bytes -= 2;
510 } else if (ethertype > 0x600) {
511 encaps_data = rfc1042_header;
512 encaps_len = sizeof(rfc1042_header);
513 skip_header_bytes -= 2;
519 skb_pull(skb, skip_header_bytes);
520 nh_pos -= skip_header_bytes;
521 h_pos -= skip_header_bytes;
523 head_need = hdrlen + encaps_len - skb_headroom(skb);
525 if (head_need > 0 || skb_cloned(skb)) {
526 head_need = max(head_need, 0);
530 if (pskb_expand_head(skb, head_need, 0, GFP_ATOMIC))
533 skb->truesize += head_need;
537 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
538 nh_pos += encaps_len;
542 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
547 /* Update skb pointers to various headers since this modified frame
548 * is going to go through Linux networking code that may potentially
549 * need things like pointer to IP header. */
550 skb_set_mac_header(skb, 0);
551 skb_set_network_header(skb, nh_pos);
552 skb_set_transport_header(skb, h_pos);
556 EXPORT_SYMBOL(ieee80211_data_from_8023);
559 void ieee80211_amsdu_to_8023s(struct sk_buff *skb, struct sk_buff_head *list,
560 const u8 *addr, enum nl80211_iftype iftype,
561 const unsigned int extra_headroom,
562 bool has_80211_header)
564 struct sk_buff *frame = NULL;
567 const struct ethhdr *eth;
569 u8 dst[ETH_ALEN], src[ETH_ALEN];
571 if (has_80211_header) {
572 err = ieee80211_data_to_8023(skb, addr, iftype);
576 /* skip the wrapping header */
577 eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr));
581 eth = (struct ethhdr *) skb->data;
584 while (skb != frame) {
586 __be16 len = eth->h_proto;
587 unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len);
589 remaining = skb->len;
590 memcpy(dst, eth->h_dest, ETH_ALEN);
591 memcpy(src, eth->h_source, ETH_ALEN);
593 padding = (4 - subframe_len) & 0x3;
594 /* the last MSDU has no padding */
595 if (subframe_len > remaining)
598 skb_pull(skb, sizeof(struct ethhdr));
599 /* reuse skb for the last subframe */
600 if (remaining <= subframe_len + padding)
603 unsigned int hlen = ALIGN(extra_headroom, 4);
605 * Allocate and reserve two bytes more for payload
606 * alignment since sizeof(struct ethhdr) is 14.
608 frame = dev_alloc_skb(hlen + subframe_len + 2);
612 skb_reserve(frame, hlen + sizeof(struct ethhdr) + 2);
613 memcpy(skb_put(frame, ntohs(len)), skb->data,
616 eth = (struct ethhdr *)skb_pull(skb, ntohs(len) +
619 dev_kfree_skb(frame);
624 skb_reset_network_header(frame);
625 frame->dev = skb->dev;
626 frame->priority = skb->priority;
628 payload = frame->data;
629 ethertype = (payload[6] << 8) | payload[7];
631 if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
632 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
633 compare_ether_addr(payload,
634 bridge_tunnel_header) == 0)) {
635 /* remove RFC1042 or Bridge-Tunnel
636 * encapsulation and replace EtherType */
638 memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
639 memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
641 memcpy(skb_push(frame, sizeof(__be16)), &len,
643 memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
644 memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
646 __skb_queue_tail(list, frame);
652 __skb_queue_purge(list);
656 EXPORT_SYMBOL(ieee80211_amsdu_to_8023s);
658 /* Given a data frame determine the 802.1p/1d tag to use. */
659 unsigned int cfg80211_classify8021d(struct sk_buff *skb)
663 /* skb->priority values from 256->263 are magic values to
664 * directly indicate a specific 802.1d priority. This is used
665 * to allow 802.1d priority to be passed directly in from VLAN
668 if (skb->priority >= 256 && skb->priority <= 263)
669 return skb->priority - 256;
671 switch (skb->protocol) {
672 case htons(ETH_P_IP):
673 dscp = ip_hdr(skb)->tos & 0xfc;
681 EXPORT_SYMBOL(cfg80211_classify8021d);
683 const u8 *ieee80211_bss_get_ie(struct cfg80211_bss *bss, u8 ie)
687 pos = bss->information_elements;
690 end = pos + bss->len_information_elements;
692 while (pos + 1 < end) {
693 if (pos + 2 + pos[1] > end)
702 EXPORT_SYMBOL(ieee80211_bss_get_ie);
704 void cfg80211_upload_connect_keys(struct wireless_dev *wdev)
706 struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
707 struct net_device *dev = wdev->netdev;
710 if (!wdev->connect_keys)
713 for (i = 0; i < 6; i++) {
714 if (!wdev->connect_keys->params[i].cipher)
716 if (rdev->ops->add_key(wdev->wiphy, dev, i, false, NULL,
717 &wdev->connect_keys->params[i])) {
718 netdev_err(dev, "failed to set key %d\n", i);
721 if (wdev->connect_keys->def == i)
722 if (rdev->ops->set_default_key(wdev->wiphy, dev,
724 netdev_err(dev, "failed to set defkey %d\n", i);
727 if (wdev->connect_keys->defmgmt == i)
728 if (rdev->ops->set_default_mgmt_key(wdev->wiphy, dev, i))
729 netdev_err(dev, "failed to set mgtdef %d\n", i);
732 kfree(wdev->connect_keys);
733 wdev->connect_keys = NULL;
736 void cfg80211_process_wdev_events(struct wireless_dev *wdev)
738 struct cfg80211_event *ev;
740 const u8 *bssid = NULL;
742 spin_lock_irqsave(&wdev->event_lock, flags);
743 while (!list_empty(&wdev->event_list)) {
744 ev = list_first_entry(&wdev->event_list,
745 struct cfg80211_event, list);
747 spin_unlock_irqrestore(&wdev->event_lock, flags);
751 case EVENT_CONNECT_RESULT:
752 if (!is_zero_ether_addr(ev->cr.bssid))
753 bssid = ev->cr.bssid;
754 __cfg80211_connect_result(
756 ev->cr.req_ie, ev->cr.req_ie_len,
757 ev->cr.resp_ie, ev->cr.resp_ie_len,
759 ev->cr.status == WLAN_STATUS_SUCCESS,
763 __cfg80211_roamed(wdev, ev->rm.channel, ev->rm.bssid,
764 ev->rm.req_ie, ev->rm.req_ie_len,
765 ev->rm.resp_ie, ev->rm.resp_ie_len);
767 case EVENT_DISCONNECTED:
768 __cfg80211_disconnected(wdev->netdev,
769 ev->dc.ie, ev->dc.ie_len,
770 ev->dc.reason, true);
772 case EVENT_IBSS_JOINED:
773 __cfg80211_ibss_joined(wdev->netdev, ev->ij.bssid);
780 spin_lock_irqsave(&wdev->event_lock, flags);
782 spin_unlock_irqrestore(&wdev->event_lock, flags);
785 void cfg80211_process_rdev_events(struct cfg80211_registered_device *rdev)
787 struct wireless_dev *wdev;
790 ASSERT_RDEV_LOCK(rdev);
792 mutex_lock(&rdev->devlist_mtx);
794 list_for_each_entry(wdev, &rdev->netdev_list, list)
795 cfg80211_process_wdev_events(wdev);
797 mutex_unlock(&rdev->devlist_mtx);
800 int cfg80211_change_iface(struct cfg80211_registered_device *rdev,
801 struct net_device *dev, enum nl80211_iftype ntype,
802 u32 *flags, struct vif_params *params)
805 enum nl80211_iftype otype = dev->ieee80211_ptr->iftype;
807 ASSERT_RDEV_LOCK(rdev);
809 /* don't support changing VLANs, you just re-create them */
810 if (otype == NL80211_IFTYPE_AP_VLAN)
813 if (!rdev->ops->change_virtual_intf ||
814 !(rdev->wiphy.interface_modes & (1 << ntype)))
817 /* if it's part of a bridge, reject changing type to station/ibss */
818 if ((dev->priv_flags & IFF_BRIDGE_PORT) &&
819 (ntype == NL80211_IFTYPE_ADHOC ||
820 ntype == NL80211_IFTYPE_STATION ||
821 ntype == NL80211_IFTYPE_P2P_CLIENT))
824 if (ntype != otype && netif_running(dev)) {
825 err = cfg80211_can_change_interface(rdev, dev->ieee80211_ptr,
830 dev->ieee80211_ptr->use_4addr = false;
831 dev->ieee80211_ptr->mesh_id_up_len = 0;
834 case NL80211_IFTYPE_ADHOC:
835 cfg80211_leave_ibss(rdev, dev, false);
837 case NL80211_IFTYPE_STATION:
838 case NL80211_IFTYPE_P2P_CLIENT:
839 cfg80211_disconnect(rdev, dev,
840 WLAN_REASON_DEAUTH_LEAVING, true);
842 case NL80211_IFTYPE_MESH_POINT:
843 /* mesh should be handled? */
849 cfg80211_process_rdev_events(rdev);
852 err = rdev->ops->change_virtual_intf(&rdev->wiphy, dev,
853 ntype, flags, params);
855 WARN_ON(!err && dev->ieee80211_ptr->iftype != ntype);
857 if (!err && params && params->use_4addr != -1)
858 dev->ieee80211_ptr->use_4addr = params->use_4addr;
861 dev->priv_flags &= ~IFF_DONT_BRIDGE;
863 case NL80211_IFTYPE_STATION:
864 if (dev->ieee80211_ptr->use_4addr)
867 case NL80211_IFTYPE_P2P_CLIENT:
868 case NL80211_IFTYPE_ADHOC:
869 dev->priv_flags |= IFF_DONT_BRIDGE;
871 case NL80211_IFTYPE_P2P_GO:
872 case NL80211_IFTYPE_AP:
873 case NL80211_IFTYPE_AP_VLAN:
874 case NL80211_IFTYPE_WDS:
875 case NL80211_IFTYPE_MESH_POINT:
878 case NL80211_IFTYPE_MONITOR:
879 /* monitor can't bridge anyway */
881 case NL80211_IFTYPE_UNSPECIFIED:
882 case NUM_NL80211_IFTYPES:
891 u16 cfg80211_calculate_bitrate(struct rate_info *rate)
893 int modulation, streams, bitrate;
895 if (!(rate->flags & RATE_INFO_FLAGS_MCS))
898 /* the formula below does only work for MCS values smaller than 32 */
902 modulation = rate->mcs & 7;
903 streams = (rate->mcs >> 3) + 1;
905 bitrate = (rate->flags & RATE_INFO_FLAGS_40_MHZ_WIDTH) ?
909 bitrate *= (modulation + 1);
910 else if (modulation == 4)
911 bitrate *= (modulation + 2);
913 bitrate *= (modulation + 3);
917 if (rate->flags & RATE_INFO_FLAGS_SHORT_GI)
918 bitrate = (bitrate / 9) * 10;
920 /* do NOT round down here */
921 return (bitrate + 50000) / 100000;
924 int cfg80211_validate_beacon_int(struct cfg80211_registered_device *rdev,
927 struct wireless_dev *wdev;
933 mutex_lock(&rdev->devlist_mtx);
935 list_for_each_entry(wdev, &rdev->netdev_list, list) {
936 if (!wdev->beacon_interval)
938 if (wdev->beacon_interval != beacon_int) {
944 mutex_unlock(&rdev->devlist_mtx);
949 int cfg80211_can_change_interface(struct cfg80211_registered_device *rdev,
950 struct wireless_dev *wdev,
951 enum nl80211_iftype iftype)
953 struct wireless_dev *wdev_iter;
954 u32 used_iftypes = BIT(iftype);
955 int num[NUM_NL80211_IFTYPES];
961 /* Always allow software iftypes */
962 if (rdev->wiphy.software_iftypes & BIT(iftype))
966 * Drivers will gradually all set this flag, until all
967 * have it we only enforce for those that set it.
969 if (!(rdev->wiphy.flags & WIPHY_FLAG_ENFORCE_COMBINATIONS))
972 memset(num, 0, sizeof(num));
976 mutex_lock(&rdev->devlist_mtx);
977 list_for_each_entry(wdev_iter, &rdev->netdev_list, list) {
978 if (wdev_iter == wdev)
980 if (!netif_running(wdev_iter->netdev))
983 if (rdev->wiphy.software_iftypes & BIT(wdev_iter->iftype))
986 num[wdev_iter->iftype]++;
988 used_iftypes |= BIT(wdev_iter->iftype);
990 mutex_unlock(&rdev->devlist_mtx);
995 for (i = 0; i < rdev->wiphy.n_iface_combinations; i++) {
996 const struct ieee80211_iface_combination *c;
997 struct ieee80211_iface_limit *limits;
1000 c = &rdev->wiphy.iface_combinations[i];
1002 limits = kmemdup(c->limits, sizeof(limits[0]) * c->n_limits,
1006 if (total > c->max_interfaces)
1009 for (iftype = 0; iftype < NUM_NL80211_IFTYPES; iftype++) {
1010 if (rdev->wiphy.software_iftypes & BIT(iftype))
1012 for (j = 0; j < c->n_limits; j++) {
1013 all_iftypes |= limits[j].types;
1014 if (!(limits[j].types & BIT(iftype)))
1016 if (limits[j].max < num[iftype])
1018 limits[j].max -= num[iftype];
1023 * Finally check that all iftypes that we're currently
1024 * using are actually part of this combination. If they
1025 * aren't then we can't use this combination and have
1026 * to continue to the next.
1028 if ((all_iftypes & used_iftypes) != used_iftypes)
1032 * This combination covered all interface types and
1033 * supported the requested numbers, so we're good.
1044 int ieee80211_get_ratemask(struct ieee80211_supported_band *sband,
1045 const u8 *rates, unsigned int n_rates,
1053 if (n_rates == 0 || n_rates > NL80211_MAX_SUPP_RATES)
1058 for (i = 0; i < n_rates; i++) {
1059 int rate = (rates[i] & 0x7f) * 5;
1062 for (j = 0; j < sband->n_bitrates; j++) {
1063 if (sband->bitrates[j].bitrate == rate) {
1074 * mask must have at least one bit set here since we
1075 * didn't accept a 0-length rates array nor allowed
1076 * entries in the array that didn't exist
1082 u32 ieee802_11_parse_elems_crc(u8 *start, size_t len,
1083 struct ieee802_11_elems *elems,
1084 u64 filter, u32 crc)
1088 bool calc_crc = filter != 0;
1090 memset(elems, 0, sizeof(*elems));
1091 elems->ie_start = start;
1092 elems->total_len = len;
1104 if (calc_crc && id < 64 && (filter & (1ULL << id)))
1105 crc = crc32_be(crc, pos - 2, elen + 2);
1110 elems->ssid_len = elen;
1112 case WLAN_EID_SUPP_RATES:
1113 elems->supp_rates = pos;
1114 elems->supp_rates_len = elen;
1116 case WLAN_EID_FH_PARAMS:
1117 elems->fh_params = pos;
1118 elems->fh_params_len = elen;
1120 case WLAN_EID_DS_PARAMS:
1121 elems->ds_params = pos;
1122 elems->ds_params_len = elen;
1124 case WLAN_EID_CF_PARAMS:
1125 elems->cf_params = pos;
1126 elems->cf_params_len = elen;
1129 if (elen >= sizeof(struct ieee80211_tim_ie)) {
1130 elems->tim = (void *)pos;
1131 elems->tim_len = elen;
1134 case WLAN_EID_IBSS_PARAMS:
1135 elems->ibss_params = pos;
1136 elems->ibss_params_len = elen;
1138 case WLAN_EID_CHALLENGE:
1139 elems->challenge = pos;
1140 elems->challenge_len = elen;
1142 case WLAN_EID_VENDOR_SPECIFIC:
1143 if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
1145 /* Microsoft OUI (00:50:F2) */
1148 crc = crc32_be(crc, pos - 2, elen + 2);
1151 /* OUI Type 1 - WPA IE */
1153 elems->wpa_len = elen;
1154 } else if (elen >= 5 && pos[3] == 2) {
1155 /* OUI Type 2 - WMM IE */
1157 elems->wmm_info = pos;
1158 elems->wmm_info_len = elen;
1159 } else if (pos[4] == 1) {
1160 elems->wmm_param = pos;
1161 elems->wmm_param_len = elen;
1168 elems->rsn_len = elen;
1170 case WLAN_EID_ERP_INFO:
1171 elems->erp_info = pos;
1172 elems->erp_info_len = elen;
1174 case WLAN_EID_EXT_SUPP_RATES:
1175 elems->ext_supp_rates = pos;
1176 elems->ext_supp_rates_len = elen;
1178 case WLAN_EID_HT_CAPABILITY:
1179 if (elen >= sizeof(struct ieee80211_ht_cap))
1180 elems->ht_cap_elem = (void *)pos;
1182 case WLAN_EID_HT_INFORMATION:
1183 if (elen >= sizeof(struct ieee80211_ht_info))
1184 elems->ht_info_elem = (void *)pos;
1186 case WLAN_EID_MESH_ID:
1187 elems->mesh_id = pos;
1188 elems->mesh_id_len = elen;
1190 case WLAN_EID_MESH_CONFIG:
1191 if (elen >= sizeof(struct ieee80211_meshconf_ie))
1192 elems->mesh_config = (void *)pos;
1194 case WLAN_EID_PEER_MGMT:
1195 elems->peering = pos;
1196 elems->peering_len = elen;
1200 elems->preq_len = elen;
1204 elems->prep_len = elen;
1208 elems->perr_len = elen;
1211 if (elen >= sizeof(struct ieee80211_rann_ie))
1212 elems->rann = (void *)pos;
1214 case WLAN_EID_CHANNEL_SWITCH:
1215 elems->ch_switch_elem = pos;
1216 elems->ch_switch_elem_len = elen;
1218 case WLAN_EID_QUIET:
1219 if (!elems->quiet_elem) {
1220 elems->quiet_elem = pos;
1221 elems->quiet_elem_len = elen;
1223 elems->num_of_quiet_elem++;
1225 case WLAN_EID_COUNTRY:
1226 elems->country_elem = pos;
1227 elems->country_elem_len = elen;
1229 case WLAN_EID_PWR_CONSTRAINT:
1230 elems->pwr_constr_elem = pos;
1231 elems->pwr_constr_elem_len = elen;
1233 case WLAN_EID_TIMEOUT_INTERVAL:
1234 elems->timeout_int = pos;
1235 elems->timeout_int_len = elen;
1247 EXPORT_SYMBOL(ieee802_11_parse_elems_crc);