2 * Wireless utility functions
4 * Copyright 2007-2009 Johannes Berg <johannes@sipsolutions.net>
5 * Copyright 2013-2014 Intel Mobile Communications GmbH
7 #include <linux/export.h>
8 #include <linux/bitops.h>
9 #include <linux/etherdevice.h>
10 #include <linux/slab.h>
11 #include <net/cfg80211.h>
13 #include <net/dsfield.h>
14 #include <linux/if_vlan.h>
15 #include <linux/mpls.h>
20 struct ieee80211_rate *
21 ieee80211_get_response_rate(struct ieee80211_supported_band *sband,
22 u32 basic_rates, int bitrate)
24 struct ieee80211_rate *result = &sband->bitrates[0];
27 for (i = 0; i < sband->n_bitrates; i++) {
28 if (!(basic_rates & BIT(i)))
30 if (sband->bitrates[i].bitrate > bitrate)
32 result = &sband->bitrates[i];
37 EXPORT_SYMBOL(ieee80211_get_response_rate);
39 u32 ieee80211_mandatory_rates(struct ieee80211_supported_band *sband,
40 enum nl80211_bss_scan_width scan_width)
42 struct ieee80211_rate *bitrates;
43 u32 mandatory_rates = 0;
44 enum ieee80211_rate_flags mandatory_flag;
50 if (sband->band == NL80211_BAND_2GHZ) {
51 if (scan_width == NL80211_BSS_CHAN_WIDTH_5 ||
52 scan_width == NL80211_BSS_CHAN_WIDTH_10)
53 mandatory_flag = IEEE80211_RATE_MANDATORY_G;
55 mandatory_flag = IEEE80211_RATE_MANDATORY_B;
57 mandatory_flag = IEEE80211_RATE_MANDATORY_A;
60 bitrates = sband->bitrates;
61 for (i = 0; i < sband->n_bitrates; i++)
62 if (bitrates[i].flags & mandatory_flag)
63 mandatory_rates |= BIT(i);
64 return mandatory_rates;
66 EXPORT_SYMBOL(ieee80211_mandatory_rates);
68 int ieee80211_channel_to_frequency(int chan, enum nl80211_band band)
70 /* see 802.11 17.3.8.3.2 and Annex J
71 * there are overlapping channel numbers in 5GHz and 2GHz bands */
73 return 0; /* not supported */
75 case NL80211_BAND_2GHZ:
79 return 2407 + chan * 5;
81 case NL80211_BAND_5GHZ:
82 if (chan >= 182 && chan <= 196)
83 return 4000 + chan * 5;
85 return 5000 + chan * 5;
87 case NL80211_BAND_60GHZ:
89 return 56160 + chan * 2160;
94 return 0; /* not supported */
96 EXPORT_SYMBOL(ieee80211_channel_to_frequency);
98 int ieee80211_frequency_to_channel(int freq)
100 /* see 802.11 17.3.8.3.2 and Annex J */
103 else if (freq < 2484)
104 return (freq - 2407) / 5;
105 else if (freq >= 4910 && freq <= 4980)
106 return (freq - 4000) / 5;
107 else if (freq <= 45000) /* DMG band lower limit */
108 return (freq - 5000) / 5;
109 else if (freq >= 58320 && freq <= 64800)
110 return (freq - 56160) / 2160;
114 EXPORT_SYMBOL(ieee80211_frequency_to_channel);
116 struct ieee80211_channel *__ieee80211_get_channel(struct wiphy *wiphy,
119 enum nl80211_band band;
120 struct ieee80211_supported_band *sband;
123 for (band = 0; band < NUM_NL80211_BANDS; band++) {
124 sband = wiphy->bands[band];
129 for (i = 0; i < sband->n_channels; i++) {
130 if (sband->channels[i].center_freq == freq)
131 return &sband->channels[i];
137 EXPORT_SYMBOL(__ieee80211_get_channel);
139 static void set_mandatory_flags_band(struct ieee80211_supported_band *sband,
140 enum nl80211_band band)
145 case NL80211_BAND_5GHZ:
147 for (i = 0; i < sband->n_bitrates; i++) {
148 if (sband->bitrates[i].bitrate == 60 ||
149 sband->bitrates[i].bitrate == 120 ||
150 sband->bitrates[i].bitrate == 240) {
151 sband->bitrates[i].flags |=
152 IEEE80211_RATE_MANDATORY_A;
158 case NL80211_BAND_2GHZ:
160 for (i = 0; i < sband->n_bitrates; i++) {
161 if (sband->bitrates[i].bitrate == 10) {
162 sband->bitrates[i].flags |=
163 IEEE80211_RATE_MANDATORY_B |
164 IEEE80211_RATE_MANDATORY_G;
168 if (sband->bitrates[i].bitrate == 20 ||
169 sband->bitrates[i].bitrate == 55 ||
170 sband->bitrates[i].bitrate == 110 ||
171 sband->bitrates[i].bitrate == 60 ||
172 sband->bitrates[i].bitrate == 120 ||
173 sband->bitrates[i].bitrate == 240) {
174 sband->bitrates[i].flags |=
175 IEEE80211_RATE_MANDATORY_G;
179 if (sband->bitrates[i].bitrate != 10 &&
180 sband->bitrates[i].bitrate != 20 &&
181 sband->bitrates[i].bitrate != 55 &&
182 sband->bitrates[i].bitrate != 110)
183 sband->bitrates[i].flags |=
184 IEEE80211_RATE_ERP_G;
186 WARN_ON(want != 0 && want != 3 && want != 6);
188 case NL80211_BAND_60GHZ:
189 /* check for mandatory HT MCS 1..4 */
190 WARN_ON(!sband->ht_cap.ht_supported);
191 WARN_ON((sband->ht_cap.mcs.rx_mask[0] & 0x1e) != 0x1e);
193 case NUM_NL80211_BANDS:
199 void ieee80211_set_bitrate_flags(struct wiphy *wiphy)
201 enum nl80211_band band;
203 for (band = 0; band < NUM_NL80211_BANDS; band++)
204 if (wiphy->bands[band])
205 set_mandatory_flags_band(wiphy->bands[band], band);
208 bool cfg80211_supported_cipher_suite(struct wiphy *wiphy, u32 cipher)
211 for (i = 0; i < wiphy->n_cipher_suites; i++)
212 if (cipher == wiphy->cipher_suites[i])
217 int cfg80211_validate_key_settings(struct cfg80211_registered_device *rdev,
218 struct key_params *params, int key_idx,
219 bool pairwise, const u8 *mac_addr)
224 if (!pairwise && mac_addr && !(rdev->wiphy.flags & WIPHY_FLAG_IBSS_RSN))
227 if (pairwise && !mac_addr)
230 switch (params->cipher) {
231 case WLAN_CIPHER_SUITE_TKIP:
232 case WLAN_CIPHER_SUITE_CCMP:
233 case WLAN_CIPHER_SUITE_CCMP_256:
234 case WLAN_CIPHER_SUITE_GCMP:
235 case WLAN_CIPHER_SUITE_GCMP_256:
236 /* Disallow pairwise keys with non-zero index unless it's WEP
237 * or a vendor specific cipher (because current deployments use
238 * pairwise WEP keys with non-zero indices and for vendor
239 * specific ciphers this should be validated in the driver or
240 * hardware level - but 802.11i clearly specifies to use zero)
242 if (pairwise && key_idx)
245 case WLAN_CIPHER_SUITE_AES_CMAC:
246 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
247 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
248 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
249 /* Disallow BIP (group-only) cipher as pairwise cipher */
257 switch (params->cipher) {
258 case WLAN_CIPHER_SUITE_WEP40:
259 if (params->key_len != WLAN_KEY_LEN_WEP40)
262 case WLAN_CIPHER_SUITE_TKIP:
263 if (params->key_len != WLAN_KEY_LEN_TKIP)
266 case WLAN_CIPHER_SUITE_CCMP:
267 if (params->key_len != WLAN_KEY_LEN_CCMP)
270 case WLAN_CIPHER_SUITE_CCMP_256:
271 if (params->key_len != WLAN_KEY_LEN_CCMP_256)
274 case WLAN_CIPHER_SUITE_GCMP:
275 if (params->key_len != WLAN_KEY_LEN_GCMP)
278 case WLAN_CIPHER_SUITE_GCMP_256:
279 if (params->key_len != WLAN_KEY_LEN_GCMP_256)
282 case WLAN_CIPHER_SUITE_WEP104:
283 if (params->key_len != WLAN_KEY_LEN_WEP104)
286 case WLAN_CIPHER_SUITE_AES_CMAC:
287 if (params->key_len != WLAN_KEY_LEN_AES_CMAC)
290 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
291 if (params->key_len != WLAN_KEY_LEN_BIP_CMAC_256)
294 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
295 if (params->key_len != WLAN_KEY_LEN_BIP_GMAC_128)
298 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
299 if (params->key_len != WLAN_KEY_LEN_BIP_GMAC_256)
304 * We don't know anything about this algorithm,
305 * allow using it -- but the driver must check
306 * all parameters! We still check below whether
307 * or not the driver supports this algorithm,
314 switch (params->cipher) {
315 case WLAN_CIPHER_SUITE_WEP40:
316 case WLAN_CIPHER_SUITE_WEP104:
317 /* These ciphers do not use key sequence */
319 case WLAN_CIPHER_SUITE_TKIP:
320 case WLAN_CIPHER_SUITE_CCMP:
321 case WLAN_CIPHER_SUITE_CCMP_256:
322 case WLAN_CIPHER_SUITE_GCMP:
323 case WLAN_CIPHER_SUITE_GCMP_256:
324 case WLAN_CIPHER_SUITE_AES_CMAC:
325 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
326 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
327 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
328 if (params->seq_len != 6)
334 if (!cfg80211_supported_cipher_suite(&rdev->wiphy, params->cipher))
340 unsigned int __attribute_const__ ieee80211_hdrlen(__le16 fc)
342 unsigned int hdrlen = 24;
344 if (ieee80211_is_data(fc)) {
345 if (ieee80211_has_a4(fc))
347 if (ieee80211_is_data_qos(fc)) {
348 hdrlen += IEEE80211_QOS_CTL_LEN;
349 if (ieee80211_has_order(fc))
350 hdrlen += IEEE80211_HT_CTL_LEN;
355 if (ieee80211_is_mgmt(fc)) {
356 if (ieee80211_has_order(fc))
357 hdrlen += IEEE80211_HT_CTL_LEN;
361 if (ieee80211_is_ctl(fc)) {
363 * ACK and CTS are 10 bytes, all others 16. To see how
364 * to get this condition consider
365 * subtype mask: 0b0000000011110000 (0x00F0)
366 * ACK subtype: 0b0000000011010000 (0x00D0)
367 * CTS subtype: 0b0000000011000000 (0x00C0)
368 * bits that matter: ^^^ (0x00E0)
369 * value of those: 0b0000000011000000 (0x00C0)
371 if ((fc & cpu_to_le16(0x00E0)) == cpu_to_le16(0x00C0))
379 EXPORT_SYMBOL(ieee80211_hdrlen);
381 unsigned int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb)
383 const struct ieee80211_hdr *hdr =
384 (const struct ieee80211_hdr *)skb->data;
387 if (unlikely(skb->len < 10))
389 hdrlen = ieee80211_hdrlen(hdr->frame_control);
390 if (unlikely(hdrlen > skb->len))
394 EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb);
396 static unsigned int __ieee80211_get_mesh_hdrlen(u8 flags)
398 int ae = flags & MESH_FLAGS_AE;
399 /* 802.11-2012, 8.2.4.7.3 */
404 case MESH_FLAGS_AE_A4:
406 case MESH_FLAGS_AE_A5_A6:
411 unsigned int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr)
413 return __ieee80211_get_mesh_hdrlen(meshhdr->flags);
415 EXPORT_SYMBOL(ieee80211_get_mesh_hdrlen);
417 static int __ieee80211_data_to_8023(struct sk_buff *skb, struct ethhdr *ehdr,
418 const u8 *addr, enum nl80211_iftype iftype)
420 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
422 u8 hdr[ETH_ALEN] __aligned(2);
429 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
432 hdrlen = ieee80211_hdrlen(hdr->frame_control);
433 if (skb->len < hdrlen + 8)
436 /* convert IEEE 802.11 header + possible LLC headers into Ethernet
438 * IEEE 802.11 address fields:
439 * ToDS FromDS Addr1 Addr2 Addr3 Addr4
440 * 0 0 DA SA BSSID n/a
441 * 0 1 DA BSSID SA n/a
442 * 1 0 BSSID SA DA n/a
445 memcpy(tmp.h_dest, ieee80211_get_DA(hdr), ETH_ALEN);
446 memcpy(tmp.h_source, ieee80211_get_SA(hdr), ETH_ALEN);
448 if (iftype == NL80211_IFTYPE_MESH_POINT)
449 skb_copy_bits(skb, hdrlen, &mesh_flags, 1);
451 switch (hdr->frame_control &
452 cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
453 case cpu_to_le16(IEEE80211_FCTL_TODS):
454 if (unlikely(iftype != NL80211_IFTYPE_AP &&
455 iftype != NL80211_IFTYPE_AP_VLAN &&
456 iftype != NL80211_IFTYPE_P2P_GO))
459 case cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
460 if (unlikely(iftype != NL80211_IFTYPE_WDS &&
461 iftype != NL80211_IFTYPE_MESH_POINT &&
462 iftype != NL80211_IFTYPE_AP_VLAN &&
463 iftype != NL80211_IFTYPE_STATION))
465 if (iftype == NL80211_IFTYPE_MESH_POINT) {
466 if (mesh_flags & MESH_FLAGS_AE_A4)
468 if (mesh_flags & MESH_FLAGS_AE_A5_A6) {
469 skb_copy_bits(skb, hdrlen +
470 offsetof(struct ieee80211s_hdr, eaddr1),
471 tmp.h_dest, 2 * ETH_ALEN);
473 hdrlen += __ieee80211_get_mesh_hdrlen(mesh_flags);
476 case cpu_to_le16(IEEE80211_FCTL_FROMDS):
477 if ((iftype != NL80211_IFTYPE_STATION &&
478 iftype != NL80211_IFTYPE_P2P_CLIENT &&
479 iftype != NL80211_IFTYPE_MESH_POINT) ||
480 (is_multicast_ether_addr(tmp.h_dest) &&
481 ether_addr_equal(tmp.h_source, addr)))
483 if (iftype == NL80211_IFTYPE_MESH_POINT) {
484 if (mesh_flags & MESH_FLAGS_AE_A5_A6)
486 if (mesh_flags & MESH_FLAGS_AE_A4)
487 skb_copy_bits(skb, hdrlen +
488 offsetof(struct ieee80211s_hdr, eaddr1),
489 tmp.h_source, ETH_ALEN);
490 hdrlen += __ieee80211_get_mesh_hdrlen(mesh_flags);
494 if (iftype != NL80211_IFTYPE_ADHOC &&
495 iftype != NL80211_IFTYPE_STATION &&
496 iftype != NL80211_IFTYPE_OCB)
501 skb_copy_bits(skb, hdrlen, &payload, sizeof(payload));
502 tmp.h_proto = payload.proto;
504 if (likely((ether_addr_equal(payload.hdr, rfc1042_header) &&
505 tmp.h_proto != htons(ETH_P_AARP) &&
506 tmp.h_proto != htons(ETH_P_IPX)) ||
507 ether_addr_equal(payload.hdr, bridge_tunnel_header)))
508 /* remove RFC1042 or Bridge-Tunnel encapsulation and
509 * replace EtherType */
510 hdrlen += ETH_ALEN + 2;
512 tmp.h_proto = htons(skb->len - hdrlen);
514 pskb_pull(skb, hdrlen);
517 ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr));
518 memcpy(ehdr, &tmp, sizeof(tmp));
523 int ieee80211_data_to_8023(struct sk_buff *skb, const u8 *addr,
524 enum nl80211_iftype iftype)
526 return __ieee80211_data_to_8023(skb, NULL, addr, iftype);
528 EXPORT_SYMBOL(ieee80211_data_to_8023);
530 int ieee80211_data_from_8023(struct sk_buff *skb, const u8 *addr,
531 enum nl80211_iftype iftype,
532 const u8 *bssid, bool qos)
534 struct ieee80211_hdr hdr;
535 u16 hdrlen, ethertype;
537 const u8 *encaps_data;
538 int encaps_len, skip_header_bytes;
542 if (unlikely(skb->len < ETH_HLEN))
545 nh_pos = skb_network_header(skb) - skb->data;
546 h_pos = skb_transport_header(skb) - skb->data;
548 /* convert Ethernet header to proper 802.11 header (based on
550 ethertype = (skb->data[12] << 8) | skb->data[13];
551 fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
554 case NL80211_IFTYPE_AP:
555 case NL80211_IFTYPE_AP_VLAN:
556 case NL80211_IFTYPE_P2P_GO:
557 fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
559 memcpy(hdr.addr1, skb->data, ETH_ALEN);
560 memcpy(hdr.addr2, addr, ETH_ALEN);
561 memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
564 case NL80211_IFTYPE_STATION:
565 case NL80211_IFTYPE_P2P_CLIENT:
566 fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
568 memcpy(hdr.addr1, bssid, ETH_ALEN);
569 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
570 memcpy(hdr.addr3, skb->data, ETH_ALEN);
573 case NL80211_IFTYPE_OCB:
574 case NL80211_IFTYPE_ADHOC:
576 memcpy(hdr.addr1, skb->data, ETH_ALEN);
577 memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
578 memcpy(hdr.addr3, bssid, ETH_ALEN);
586 fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
590 hdr.frame_control = fc;
594 skip_header_bytes = ETH_HLEN;
595 if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
596 encaps_data = bridge_tunnel_header;
597 encaps_len = sizeof(bridge_tunnel_header);
598 skip_header_bytes -= 2;
599 } else if (ethertype >= ETH_P_802_3_MIN) {
600 encaps_data = rfc1042_header;
601 encaps_len = sizeof(rfc1042_header);
602 skip_header_bytes -= 2;
608 skb_pull(skb, skip_header_bytes);
609 nh_pos -= skip_header_bytes;
610 h_pos -= skip_header_bytes;
612 head_need = hdrlen + encaps_len - skb_headroom(skb);
614 if (head_need > 0 || skb_cloned(skb)) {
615 head_need = max(head_need, 0);
619 if (pskb_expand_head(skb, head_need, 0, GFP_ATOMIC))
622 skb->truesize += head_need;
626 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
627 nh_pos += encaps_len;
631 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
636 /* Update skb pointers to various headers since this modified frame
637 * is going to go through Linux networking code that may potentially
638 * need things like pointer to IP header. */
639 skb_reset_mac_header(skb);
640 skb_set_network_header(skb, nh_pos);
641 skb_set_transport_header(skb, h_pos);
645 EXPORT_SYMBOL(ieee80211_data_from_8023);
648 __frame_add_frag(struct sk_buff *skb, struct page *page,
649 void *ptr, int len, int size)
651 struct skb_shared_info *sh = skb_shinfo(skb);
655 page_offset = ptr - page_address(page);
656 skb_add_rx_frag(skb, sh->nr_frags, page, page_offset, len, size);
660 __ieee80211_amsdu_copy_frag(struct sk_buff *skb, struct sk_buff *frame,
663 struct skb_shared_info *sh = skb_shinfo(skb);
664 const skb_frag_t *frag = &sh->frags[-1];
665 struct page *frag_page;
667 int frag_len, frag_size;
668 int head_size = skb->len - skb->data_len;
671 frag_page = virt_to_head_page(skb->head);
672 frag_ptr = skb->data;
673 frag_size = head_size;
675 while (offset >= frag_size) {
678 frag_page = skb_frag_page(frag);
679 frag_ptr = skb_frag_address(frag);
680 frag_size = skb_frag_size(frag);
684 frag_len = frag_size - offset;
686 cur_len = min(len, frag_len);
688 __frame_add_frag(frame, frag_page, frag_ptr, cur_len, frag_size);
693 frag_len = skb_frag_size(frag);
694 cur_len = min(len, frag_len);
695 __frame_add_frag(frame, skb_frag_page(frag),
696 skb_frag_address(frag), cur_len, frag_len);
701 static struct sk_buff *
702 __ieee80211_amsdu_copy(struct sk_buff *skb, unsigned int hlen,
703 int offset, int len, bool reuse_frag)
705 struct sk_buff *frame;
708 if (skb->len - offset < len)
712 * When reusing framents, copy some data to the head to simplify
713 * ethernet header handling and speed up protocol header processing
714 * in the stack later.
717 cur_len = min_t(int, len, 32);
720 * Allocate and reserve two bytes more for payload
721 * alignment since sizeof(struct ethhdr) is 14.
723 frame = dev_alloc_skb(hlen + sizeof(struct ethhdr) + 2 + cur_len);
727 skb_reserve(frame, hlen + sizeof(struct ethhdr) + 2);
728 skb_copy_bits(skb, offset, skb_put(frame, cur_len), cur_len);
735 __ieee80211_amsdu_copy_frag(skb, frame, offset, len);
740 void ieee80211_amsdu_to_8023s(struct sk_buff *skb, struct sk_buff_head *list,
741 const u8 *addr, enum nl80211_iftype iftype,
742 const unsigned int extra_headroom,
743 bool has_80211_header)
745 unsigned int hlen = ALIGN(extra_headroom, 4);
746 struct sk_buff *frame = NULL;
749 int offset = 0, remaining, err;
751 bool reuse_frag = skb->head_frag && !skb_has_frag_list(skb);
752 bool reuse_skb = false;
755 if (has_80211_header) {
756 err = __ieee80211_data_to_8023(skb, ð, addr, iftype);
762 unsigned int subframe_len;
766 skb_copy_bits(skb, offset, ð, sizeof(eth));
767 len = ntohs(eth.h_proto);
768 subframe_len = sizeof(struct ethhdr) + len;
769 padding = (4 - subframe_len) & 0x3;
771 /* the last MSDU has no padding */
772 remaining = skb->len - offset;
773 if (subframe_len > remaining)
776 offset += sizeof(struct ethhdr);
777 /* reuse skb for the last subframe */
778 last = remaining <= subframe_len + padding;
779 if (!skb_is_nonlinear(skb) && !reuse_frag && last) {
780 skb_pull(skb, offset);
784 frame = __ieee80211_amsdu_copy(skb, hlen, offset, len,
789 offset += len + padding;
792 skb_reset_network_header(frame);
793 frame->dev = skb->dev;
794 frame->priority = skb->priority;
796 payload = frame->data;
797 ethertype = (payload[6] << 8) | payload[7];
798 if (likely((ether_addr_equal(payload, rfc1042_header) &&
799 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
800 ether_addr_equal(payload, bridge_tunnel_header))) {
801 eth.h_proto = htons(ethertype);
802 skb_pull(frame, ETH_ALEN + 2);
805 memcpy(skb_push(frame, sizeof(eth)), ð, sizeof(eth));
806 __skb_queue_tail(list, frame);
815 __skb_queue_purge(list);
819 EXPORT_SYMBOL(ieee80211_amsdu_to_8023s);
821 /* Given a data frame determine the 802.1p/1d tag to use. */
822 unsigned int cfg80211_classify8021d(struct sk_buff *skb,
823 struct cfg80211_qos_map *qos_map)
826 unsigned char vlan_priority;
828 /* skb->priority values from 256->263 are magic values to
829 * directly indicate a specific 802.1d priority. This is used
830 * to allow 802.1d priority to be passed directly in from VLAN
833 if (skb->priority >= 256 && skb->priority <= 263)
834 return skb->priority - 256;
836 if (skb_vlan_tag_present(skb)) {
837 vlan_priority = (skb_vlan_tag_get(skb) & VLAN_PRIO_MASK)
839 if (vlan_priority > 0)
840 return vlan_priority;
843 switch (skb->protocol) {
844 case htons(ETH_P_IP):
845 dscp = ipv4_get_dsfield(ip_hdr(skb)) & 0xfc;
847 case htons(ETH_P_IPV6):
848 dscp = ipv6_get_dsfield(ipv6_hdr(skb)) & 0xfc;
850 case htons(ETH_P_MPLS_UC):
851 case htons(ETH_P_MPLS_MC): {
852 struct mpls_label mpls_tmp, *mpls;
854 mpls = skb_header_pointer(skb, sizeof(struct ethhdr),
855 sizeof(*mpls), &mpls_tmp);
859 return (ntohl(mpls->entry) & MPLS_LS_TC_MASK)
862 case htons(ETH_P_80221):
863 /* 802.21 is always network control traffic */
870 unsigned int i, tmp_dscp = dscp >> 2;
872 for (i = 0; i < qos_map->num_des; i++) {
873 if (tmp_dscp == qos_map->dscp_exception[i].dscp)
874 return qos_map->dscp_exception[i].up;
877 for (i = 0; i < 8; i++) {
878 if (tmp_dscp >= qos_map->up[i].low &&
879 tmp_dscp <= qos_map->up[i].high)
886 EXPORT_SYMBOL(cfg80211_classify8021d);
888 const u8 *ieee80211_bss_get_ie(struct cfg80211_bss *bss, u8 ie)
890 const struct cfg80211_bss_ies *ies;
892 ies = rcu_dereference(bss->ies);
896 return cfg80211_find_ie(ie, ies->data, ies->len);
898 EXPORT_SYMBOL(ieee80211_bss_get_ie);
900 void cfg80211_upload_connect_keys(struct wireless_dev *wdev)
902 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
903 struct net_device *dev = wdev->netdev;
906 if (!wdev->connect_keys)
909 for (i = 0; i < 6; i++) {
910 if (!wdev->connect_keys->params[i].cipher)
912 if (rdev_add_key(rdev, dev, i, false, NULL,
913 &wdev->connect_keys->params[i])) {
914 netdev_err(dev, "failed to set key %d\n", i);
917 if (wdev->connect_keys->def == i)
918 if (rdev_set_default_key(rdev, dev, i, true, true)) {
919 netdev_err(dev, "failed to set defkey %d\n", i);
922 if (wdev->connect_keys->defmgmt == i)
923 if (rdev_set_default_mgmt_key(rdev, dev, i))
924 netdev_err(dev, "failed to set mgtdef %d\n", i);
927 kzfree(wdev->connect_keys);
928 wdev->connect_keys = NULL;
931 void cfg80211_process_wdev_events(struct wireless_dev *wdev)
933 struct cfg80211_event *ev;
935 const u8 *bssid = NULL;
937 spin_lock_irqsave(&wdev->event_lock, flags);
938 while (!list_empty(&wdev->event_list)) {
939 ev = list_first_entry(&wdev->event_list,
940 struct cfg80211_event, list);
942 spin_unlock_irqrestore(&wdev->event_lock, flags);
946 case EVENT_CONNECT_RESULT:
947 if (!is_zero_ether_addr(ev->cr.bssid))
948 bssid = ev->cr.bssid;
949 __cfg80211_connect_result(
951 ev->cr.req_ie, ev->cr.req_ie_len,
952 ev->cr.resp_ie, ev->cr.resp_ie_len,
954 ev->cr.status == WLAN_STATUS_SUCCESS,
958 __cfg80211_roamed(wdev, ev->rm.bss, ev->rm.req_ie,
959 ev->rm.req_ie_len, ev->rm.resp_ie,
962 case EVENT_DISCONNECTED:
963 __cfg80211_disconnected(wdev->netdev,
964 ev->dc.ie, ev->dc.ie_len,
966 !ev->dc.locally_generated);
968 case EVENT_IBSS_JOINED:
969 __cfg80211_ibss_joined(wdev->netdev, ev->ij.bssid,
973 __cfg80211_leave(wiphy_to_rdev(wdev->wiphy), wdev);
980 spin_lock_irqsave(&wdev->event_lock, flags);
982 spin_unlock_irqrestore(&wdev->event_lock, flags);
985 void cfg80211_process_rdev_events(struct cfg80211_registered_device *rdev)
987 struct wireless_dev *wdev;
991 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list)
992 cfg80211_process_wdev_events(wdev);
995 int cfg80211_change_iface(struct cfg80211_registered_device *rdev,
996 struct net_device *dev, enum nl80211_iftype ntype,
997 u32 *flags, struct vif_params *params)
1000 enum nl80211_iftype otype = dev->ieee80211_ptr->iftype;
1004 /* don't support changing VLANs, you just re-create them */
1005 if (otype == NL80211_IFTYPE_AP_VLAN)
1008 /* cannot change into P2P device type */
1009 if (ntype == NL80211_IFTYPE_P2P_DEVICE)
1012 if (!rdev->ops->change_virtual_intf ||
1013 !(rdev->wiphy.interface_modes & (1 << ntype)))
1016 /* if it's part of a bridge, reject changing type to station/ibss */
1017 if ((dev->priv_flags & IFF_BRIDGE_PORT) &&
1018 (ntype == NL80211_IFTYPE_ADHOC ||
1019 ntype == NL80211_IFTYPE_STATION ||
1020 ntype == NL80211_IFTYPE_P2P_CLIENT))
1023 if (ntype != otype) {
1024 dev->ieee80211_ptr->use_4addr = false;
1025 dev->ieee80211_ptr->mesh_id_up_len = 0;
1026 wdev_lock(dev->ieee80211_ptr);
1027 rdev_set_qos_map(rdev, dev, NULL);
1028 wdev_unlock(dev->ieee80211_ptr);
1031 case NL80211_IFTYPE_AP:
1032 cfg80211_stop_ap(rdev, dev, true);
1034 case NL80211_IFTYPE_ADHOC:
1035 cfg80211_leave_ibss(rdev, dev, false);
1037 case NL80211_IFTYPE_STATION:
1038 case NL80211_IFTYPE_P2P_CLIENT:
1039 wdev_lock(dev->ieee80211_ptr);
1040 cfg80211_disconnect(rdev, dev,
1041 WLAN_REASON_DEAUTH_LEAVING, true);
1042 wdev_unlock(dev->ieee80211_ptr);
1044 case NL80211_IFTYPE_MESH_POINT:
1045 /* mesh should be handled? */
1051 cfg80211_process_rdev_events(rdev);
1054 err = rdev_change_virtual_intf(rdev, dev, ntype, flags, params);
1056 WARN_ON(!err && dev->ieee80211_ptr->iftype != ntype);
1058 if (!err && params && params->use_4addr != -1)
1059 dev->ieee80211_ptr->use_4addr = params->use_4addr;
1062 dev->priv_flags &= ~IFF_DONT_BRIDGE;
1064 case NL80211_IFTYPE_STATION:
1065 if (dev->ieee80211_ptr->use_4addr)
1068 case NL80211_IFTYPE_OCB:
1069 case NL80211_IFTYPE_P2P_CLIENT:
1070 case NL80211_IFTYPE_ADHOC:
1071 dev->priv_flags |= IFF_DONT_BRIDGE;
1073 case NL80211_IFTYPE_P2P_GO:
1074 case NL80211_IFTYPE_AP:
1075 case NL80211_IFTYPE_AP_VLAN:
1076 case NL80211_IFTYPE_WDS:
1077 case NL80211_IFTYPE_MESH_POINT:
1080 case NL80211_IFTYPE_MONITOR:
1081 /* monitor can't bridge anyway */
1083 case NL80211_IFTYPE_UNSPECIFIED:
1084 case NUM_NL80211_IFTYPES:
1087 case NL80211_IFTYPE_P2P_DEVICE:
1093 if (!err && ntype != otype && netif_running(dev)) {
1094 cfg80211_update_iface_num(rdev, ntype, 1);
1095 cfg80211_update_iface_num(rdev, otype, -1);
1101 static u32 cfg80211_calculate_bitrate_60g(struct rate_info *rate)
1103 static const u32 __mcs2bitrate[] = {
1111 [5] = 12512, /* 1251.25 mbps */
1121 [14] = 8662, /* 866.25 mbps */
1131 [24] = 67568, /* 6756.75 mbps */
1142 if (WARN_ON_ONCE(rate->mcs >= ARRAY_SIZE(__mcs2bitrate)))
1145 return __mcs2bitrate[rate->mcs];
1148 static u32 cfg80211_calculate_bitrate_vht(struct rate_info *rate)
1150 static const u32 base[4][10] = {
1199 if (WARN_ON_ONCE(rate->mcs > 9))
1203 case RATE_INFO_BW_160:
1206 case RATE_INFO_BW_80:
1209 case RATE_INFO_BW_40:
1212 case RATE_INFO_BW_5:
1213 case RATE_INFO_BW_10:
1217 case RATE_INFO_BW_20:
1221 bitrate = base[idx][rate->mcs];
1222 bitrate *= rate->nss;
1224 if (rate->flags & RATE_INFO_FLAGS_SHORT_GI)
1225 bitrate = (bitrate / 9) * 10;
1227 /* do NOT round down here */
1228 return (bitrate + 50000) / 100000;
1231 u32 cfg80211_calculate_bitrate(struct rate_info *rate)
1233 int modulation, streams, bitrate;
1235 if (!(rate->flags & RATE_INFO_FLAGS_MCS) &&
1236 !(rate->flags & RATE_INFO_FLAGS_VHT_MCS))
1237 return rate->legacy;
1238 if (rate->flags & RATE_INFO_FLAGS_60G)
1239 return cfg80211_calculate_bitrate_60g(rate);
1240 if (rate->flags & RATE_INFO_FLAGS_VHT_MCS)
1241 return cfg80211_calculate_bitrate_vht(rate);
1243 /* the formula below does only work for MCS values smaller than 32 */
1244 if (WARN_ON_ONCE(rate->mcs >= 32))
1247 modulation = rate->mcs & 7;
1248 streams = (rate->mcs >> 3) + 1;
1250 bitrate = (rate->bw == RATE_INFO_BW_40) ? 13500000 : 6500000;
1253 bitrate *= (modulation + 1);
1254 else if (modulation == 4)
1255 bitrate *= (modulation + 2);
1257 bitrate *= (modulation + 3);
1261 if (rate->flags & RATE_INFO_FLAGS_SHORT_GI)
1262 bitrate = (bitrate / 9) * 10;
1264 /* do NOT round down here */
1265 return (bitrate + 50000) / 100000;
1267 EXPORT_SYMBOL(cfg80211_calculate_bitrate);
1269 int cfg80211_get_p2p_attr(const u8 *ies, unsigned int len,
1270 enum ieee80211_p2p_attr_id attr,
1271 u8 *buf, unsigned int bufsize)
1274 u16 attr_remaining = 0;
1275 bool desired_attr = false;
1276 u16 desired_len = 0;
1279 unsigned int iedatalen;
1286 if (iedatalen + 2 > len)
1289 if (ies[0] != WLAN_EID_VENDOR_SPECIFIC)
1297 /* check WFA OUI, P2P subtype */
1298 if (iedata[0] != 0x50 || iedata[1] != 0x6f ||
1299 iedata[2] != 0x9a || iedata[3] != 0x09)
1305 /* check attribute continuation into this IE */
1306 copy = min_t(unsigned int, attr_remaining, iedatalen);
1307 if (copy && desired_attr) {
1308 desired_len += copy;
1310 memcpy(out, iedata, min(bufsize, copy));
1311 out += min(bufsize, copy);
1312 bufsize -= min(bufsize, copy);
1316 if (copy == attr_remaining)
1320 attr_remaining -= copy;
1327 while (iedatalen > 0) {
1330 /* P2P attribute ID & size must fit */
1333 desired_attr = iedata[0] == attr;
1334 attr_len = get_unaligned_le16(iedata + 1);
1338 copy = min_t(unsigned int, attr_len, iedatalen);
1341 desired_len += copy;
1343 memcpy(out, iedata, min(bufsize, copy));
1344 out += min(bufsize, copy);
1345 bufsize -= min(bufsize, copy);
1348 if (copy == attr_len)
1354 attr_remaining = attr_len - copy;
1362 if (attr_remaining && desired_attr)
1367 EXPORT_SYMBOL(cfg80211_get_p2p_attr);
1369 static bool ieee80211_id_in_list(const u8 *ids, int n_ids, u8 id)
1373 for (i = 0; i < n_ids; i++)
1379 size_t ieee80211_ie_split_ric(const u8 *ies, size_t ielen,
1380 const u8 *ids, int n_ids,
1381 const u8 *after_ric, int n_after_ric,
1384 size_t pos = offset;
1386 while (pos < ielen && ieee80211_id_in_list(ids, n_ids, ies[pos])) {
1387 if (ies[pos] == WLAN_EID_RIC_DATA && n_after_ric) {
1388 pos += 2 + ies[pos + 1];
1390 while (pos < ielen &&
1391 !ieee80211_id_in_list(after_ric, n_after_ric,
1393 pos += 2 + ies[pos + 1];
1395 pos += 2 + ies[pos + 1];
1401 EXPORT_SYMBOL(ieee80211_ie_split_ric);
1403 bool ieee80211_operating_class_to_band(u8 operating_class,
1404 enum nl80211_band *band)
1406 switch (operating_class) {
1410 *band = NL80211_BAND_5GHZ;
1416 *band = NL80211_BAND_2GHZ;
1419 *band = NL80211_BAND_60GHZ;
1425 EXPORT_SYMBOL(ieee80211_operating_class_to_band);
1427 bool ieee80211_chandef_to_operating_class(struct cfg80211_chan_def *chandef,
1431 u16 freq = chandef->center_freq1;
1433 if (freq >= 2412 && freq <= 2472) {
1434 if (chandef->width > NL80211_CHAN_WIDTH_40)
1437 /* 2.407 GHz, channels 1..13 */
1438 if (chandef->width == NL80211_CHAN_WIDTH_40) {
1439 if (freq > chandef->chan->center_freq)
1440 *op_class = 83; /* HT40+ */
1442 *op_class = 84; /* HT40- */
1451 if (chandef->width > NL80211_CHAN_WIDTH_40)
1454 *op_class = 82; /* channel 14 */
1458 switch (chandef->width) {
1459 case NL80211_CHAN_WIDTH_80:
1462 case NL80211_CHAN_WIDTH_160:
1465 case NL80211_CHAN_WIDTH_80P80:
1468 case NL80211_CHAN_WIDTH_10:
1469 case NL80211_CHAN_WIDTH_5:
1470 return false; /* unsupported for now */
1476 /* 5 GHz, channels 36..48 */
1477 if (freq >= 5180 && freq <= 5240) {
1479 *op_class = vht_opclass;
1480 } else if (chandef->width == NL80211_CHAN_WIDTH_40) {
1481 if (freq > chandef->chan->center_freq)
1492 /* 5 GHz, channels 52..64 */
1493 if (freq >= 5260 && freq <= 5320) {
1495 *op_class = vht_opclass;
1496 } else if (chandef->width == NL80211_CHAN_WIDTH_40) {
1497 if (freq > chandef->chan->center_freq)
1508 /* 5 GHz, channels 100..144 */
1509 if (freq >= 5500 && freq <= 5720) {
1511 *op_class = vht_opclass;
1512 } else if (chandef->width == NL80211_CHAN_WIDTH_40) {
1513 if (freq > chandef->chan->center_freq)
1524 /* 5 GHz, channels 149..169 */
1525 if (freq >= 5745 && freq <= 5845) {
1527 *op_class = vht_opclass;
1528 } else if (chandef->width == NL80211_CHAN_WIDTH_40) {
1529 if (freq > chandef->chan->center_freq)
1533 } else if (freq <= 5805) {
1542 /* 56.16 GHz, channel 1..4 */
1543 if (freq >= 56160 + 2160 * 1 && freq <= 56160 + 2160 * 4) {
1544 if (chandef->width >= NL80211_CHAN_WIDTH_40)
1551 /* not supported yet */
1554 EXPORT_SYMBOL(ieee80211_chandef_to_operating_class);
1556 int cfg80211_validate_beacon_int(struct cfg80211_registered_device *rdev,
1559 struct wireless_dev *wdev;
1565 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
1566 if (!wdev->beacon_interval)
1568 if (wdev->beacon_interval != beacon_int) {
1577 int cfg80211_iter_combinations(struct wiphy *wiphy,
1578 const int num_different_channels,
1579 const u8 radar_detect,
1580 const int iftype_num[NUM_NL80211_IFTYPES],
1581 void (*iter)(const struct ieee80211_iface_combination *c,
1585 const struct ieee80211_regdomain *regdom;
1586 enum nl80211_dfs_regions region = 0;
1588 int num_interfaces = 0;
1589 u32 used_iftypes = 0;
1593 regdom = rcu_dereference(cfg80211_regdomain);
1595 region = regdom->dfs_region;
1599 for (iftype = 0; iftype < NUM_NL80211_IFTYPES; iftype++) {
1600 num_interfaces += iftype_num[iftype];
1601 if (iftype_num[iftype] > 0 &&
1602 !(wiphy->software_iftypes & BIT(iftype)))
1603 used_iftypes |= BIT(iftype);
1606 for (i = 0; i < wiphy->n_iface_combinations; i++) {
1607 const struct ieee80211_iface_combination *c;
1608 struct ieee80211_iface_limit *limits;
1609 u32 all_iftypes = 0;
1611 c = &wiphy->iface_combinations[i];
1613 if (num_interfaces > c->max_interfaces)
1615 if (num_different_channels > c->num_different_channels)
1618 limits = kmemdup(c->limits, sizeof(limits[0]) * c->n_limits,
1623 for (iftype = 0; iftype < NUM_NL80211_IFTYPES; iftype++) {
1624 if (wiphy->software_iftypes & BIT(iftype))
1626 for (j = 0; j < c->n_limits; j++) {
1627 all_iftypes |= limits[j].types;
1628 if (!(limits[j].types & BIT(iftype)))
1630 if (limits[j].max < iftype_num[iftype])
1632 limits[j].max -= iftype_num[iftype];
1636 if (radar_detect != (c->radar_detect_widths & radar_detect))
1639 if (radar_detect && c->radar_detect_regions &&
1640 !(c->radar_detect_regions & BIT(region)))
1643 /* Finally check that all iftypes that we're currently
1644 * using are actually part of this combination. If they
1645 * aren't then we can't use this combination and have
1646 * to continue to the next.
1648 if ((all_iftypes & used_iftypes) != used_iftypes)
1651 /* This combination covered all interface types and
1652 * supported the requested numbers, so we're good.
1662 EXPORT_SYMBOL(cfg80211_iter_combinations);
1665 cfg80211_iter_sum_ifcombs(const struct ieee80211_iface_combination *c,
1672 int cfg80211_check_combinations(struct wiphy *wiphy,
1673 const int num_different_channels,
1674 const u8 radar_detect,
1675 const int iftype_num[NUM_NL80211_IFTYPES])
1679 err = cfg80211_iter_combinations(wiphy, num_different_channels,
1680 radar_detect, iftype_num,
1681 cfg80211_iter_sum_ifcombs, &num);
1689 EXPORT_SYMBOL(cfg80211_check_combinations);
1691 int ieee80211_get_ratemask(struct ieee80211_supported_band *sband,
1692 const u8 *rates, unsigned int n_rates,
1700 if (n_rates == 0 || n_rates > NL80211_MAX_SUPP_RATES)
1705 for (i = 0; i < n_rates; i++) {
1706 int rate = (rates[i] & 0x7f) * 5;
1709 for (j = 0; j < sband->n_bitrates; j++) {
1710 if (sband->bitrates[j].bitrate == rate) {
1721 * mask must have at least one bit set here since we
1722 * didn't accept a 0-length rates array nor allowed
1723 * entries in the array that didn't exist
1729 unsigned int ieee80211_get_num_supported_channels(struct wiphy *wiphy)
1731 enum nl80211_band band;
1732 unsigned int n_channels = 0;
1734 for (band = 0; band < NUM_NL80211_BANDS; band++)
1735 if (wiphy->bands[band])
1736 n_channels += wiphy->bands[band]->n_channels;
1740 EXPORT_SYMBOL(ieee80211_get_num_supported_channels);
1742 int cfg80211_get_station(struct net_device *dev, const u8 *mac_addr,
1743 struct station_info *sinfo)
1745 struct cfg80211_registered_device *rdev;
1746 struct wireless_dev *wdev;
1748 wdev = dev->ieee80211_ptr;
1752 rdev = wiphy_to_rdev(wdev->wiphy);
1753 if (!rdev->ops->get_station)
1756 return rdev_get_station(rdev, dev, mac_addr, sinfo);
1758 EXPORT_SYMBOL(cfg80211_get_station);
1760 /* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
1761 /* Ethernet-II snap header (RFC1042 for most EtherTypes) */
1762 const unsigned char rfc1042_header[] __aligned(2) =
1763 { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
1764 EXPORT_SYMBOL(rfc1042_header);
1766 /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
1767 const unsigned char bridge_tunnel_header[] __aligned(2) =
1768 { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
1769 EXPORT_SYMBOL(bridge_tunnel_header);