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>
16 #include <linux/gcd.h>
21 struct ieee80211_rate *
22 ieee80211_get_response_rate(struct ieee80211_supported_band *sband,
23 u32 basic_rates, int bitrate)
25 struct ieee80211_rate *result = &sband->bitrates[0];
28 for (i = 0; i < sband->n_bitrates; i++) {
29 if (!(basic_rates & BIT(i)))
31 if (sband->bitrates[i].bitrate > bitrate)
33 result = &sband->bitrates[i];
38 EXPORT_SYMBOL(ieee80211_get_response_rate);
40 u32 ieee80211_mandatory_rates(struct ieee80211_supported_band *sband,
41 enum nl80211_bss_scan_width scan_width)
43 struct ieee80211_rate *bitrates;
44 u32 mandatory_rates = 0;
45 enum ieee80211_rate_flags mandatory_flag;
51 if (sband->band == NL80211_BAND_2GHZ) {
52 if (scan_width == NL80211_BSS_CHAN_WIDTH_5 ||
53 scan_width == NL80211_BSS_CHAN_WIDTH_10)
54 mandatory_flag = IEEE80211_RATE_MANDATORY_G;
56 mandatory_flag = IEEE80211_RATE_MANDATORY_B;
58 mandatory_flag = IEEE80211_RATE_MANDATORY_A;
61 bitrates = sband->bitrates;
62 for (i = 0; i < sband->n_bitrates; i++)
63 if (bitrates[i].flags & mandatory_flag)
64 mandatory_rates |= BIT(i);
65 return mandatory_rates;
67 EXPORT_SYMBOL(ieee80211_mandatory_rates);
69 int ieee80211_channel_to_frequency(int chan, enum nl80211_band band)
71 /* see 802.11 17.3.8.3.2 and Annex J
72 * there are overlapping channel numbers in 5GHz and 2GHz bands */
74 return 0; /* not supported */
76 case NL80211_BAND_2GHZ:
80 return 2407 + chan * 5;
82 case NL80211_BAND_5GHZ:
83 if (chan >= 182 && chan <= 196)
84 return 4000 + chan * 5;
86 return 5000 + chan * 5;
88 case NL80211_BAND_60GHZ:
90 return 56160 + chan * 2160;
95 return 0; /* not supported */
97 EXPORT_SYMBOL(ieee80211_channel_to_frequency);
99 int ieee80211_frequency_to_channel(int freq)
101 /* see 802.11 17.3.8.3.2 and Annex J */
104 else if (freq < 2484)
105 return (freq - 2407) / 5;
106 else if (freq >= 4910 && freq <= 4980)
107 return (freq - 4000) / 5;
108 else if (freq <= 45000) /* DMG band lower limit */
109 return (freq - 5000) / 5;
110 else if (freq >= 58320 && freq <= 64800)
111 return (freq - 56160) / 2160;
115 EXPORT_SYMBOL(ieee80211_frequency_to_channel);
117 struct ieee80211_channel *ieee80211_get_channel(struct wiphy *wiphy, int freq)
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)
143 switch (sband->band) {
144 case NL80211_BAND_5GHZ:
146 for (i = 0; i < sband->n_bitrates; i++) {
147 if (sband->bitrates[i].bitrate == 60 ||
148 sband->bitrates[i].bitrate == 120 ||
149 sband->bitrates[i].bitrate == 240) {
150 sband->bitrates[i].flags |=
151 IEEE80211_RATE_MANDATORY_A;
157 case NL80211_BAND_2GHZ:
159 for (i = 0; i < sband->n_bitrates; i++) {
160 if (sband->bitrates[i].bitrate == 10) {
161 sband->bitrates[i].flags |=
162 IEEE80211_RATE_MANDATORY_B |
163 IEEE80211_RATE_MANDATORY_G;
167 if (sband->bitrates[i].bitrate == 20 ||
168 sband->bitrates[i].bitrate == 55 ||
169 sband->bitrates[i].bitrate == 110 ||
170 sband->bitrates[i].bitrate == 60 ||
171 sband->bitrates[i].bitrate == 120 ||
172 sband->bitrates[i].bitrate == 240) {
173 sband->bitrates[i].flags |=
174 IEEE80211_RATE_MANDATORY_G;
178 if (sband->bitrates[i].bitrate != 10 &&
179 sband->bitrates[i].bitrate != 20 &&
180 sband->bitrates[i].bitrate != 55 &&
181 sband->bitrates[i].bitrate != 110)
182 sband->bitrates[i].flags |=
183 IEEE80211_RATE_ERP_G;
185 WARN_ON(want != 0 && want != 3 && want != 6);
187 case NL80211_BAND_60GHZ:
188 /* check for mandatory HT MCS 1..4 */
189 WARN_ON(!sband->ht_cap.ht_supported);
190 WARN_ON((sband->ht_cap.mcs.rx_mask[0] & 0x1e) != 0x1e);
192 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]);
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)
221 if (key_idx < 0 || key_idx > 5)
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 */
255 case WLAN_CIPHER_SUITE_WEP40:
256 case WLAN_CIPHER_SUITE_WEP104:
263 switch (params->cipher) {
264 case WLAN_CIPHER_SUITE_WEP40:
265 if (params->key_len != WLAN_KEY_LEN_WEP40)
268 case WLAN_CIPHER_SUITE_TKIP:
269 if (params->key_len != WLAN_KEY_LEN_TKIP)
272 case WLAN_CIPHER_SUITE_CCMP:
273 if (params->key_len != WLAN_KEY_LEN_CCMP)
276 case WLAN_CIPHER_SUITE_CCMP_256:
277 if (params->key_len != WLAN_KEY_LEN_CCMP_256)
280 case WLAN_CIPHER_SUITE_GCMP:
281 if (params->key_len != WLAN_KEY_LEN_GCMP)
284 case WLAN_CIPHER_SUITE_GCMP_256:
285 if (params->key_len != WLAN_KEY_LEN_GCMP_256)
288 case WLAN_CIPHER_SUITE_WEP104:
289 if (params->key_len != WLAN_KEY_LEN_WEP104)
292 case WLAN_CIPHER_SUITE_AES_CMAC:
293 if (params->key_len != WLAN_KEY_LEN_AES_CMAC)
296 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
297 if (params->key_len != WLAN_KEY_LEN_BIP_CMAC_256)
300 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
301 if (params->key_len != WLAN_KEY_LEN_BIP_GMAC_128)
304 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
305 if (params->key_len != WLAN_KEY_LEN_BIP_GMAC_256)
310 * We don't know anything about this algorithm,
311 * allow using it -- but the driver must check
312 * all parameters! We still check below whether
313 * or not the driver supports this algorithm,
320 switch (params->cipher) {
321 case WLAN_CIPHER_SUITE_WEP40:
322 case WLAN_CIPHER_SUITE_WEP104:
323 /* These ciphers do not use key sequence */
325 case WLAN_CIPHER_SUITE_TKIP:
326 case WLAN_CIPHER_SUITE_CCMP:
327 case WLAN_CIPHER_SUITE_CCMP_256:
328 case WLAN_CIPHER_SUITE_GCMP:
329 case WLAN_CIPHER_SUITE_GCMP_256:
330 case WLAN_CIPHER_SUITE_AES_CMAC:
331 case WLAN_CIPHER_SUITE_BIP_CMAC_256:
332 case WLAN_CIPHER_SUITE_BIP_GMAC_128:
333 case WLAN_CIPHER_SUITE_BIP_GMAC_256:
334 if (params->seq_len != 6)
340 if (!cfg80211_supported_cipher_suite(&rdev->wiphy, params->cipher))
346 unsigned int __attribute_const__ ieee80211_hdrlen(__le16 fc)
348 unsigned int hdrlen = 24;
350 if (ieee80211_is_data(fc)) {
351 if (ieee80211_has_a4(fc))
353 if (ieee80211_is_data_qos(fc)) {
354 hdrlen += IEEE80211_QOS_CTL_LEN;
355 if (ieee80211_has_order(fc))
356 hdrlen += IEEE80211_HT_CTL_LEN;
361 if (ieee80211_is_mgmt(fc)) {
362 if (ieee80211_has_order(fc))
363 hdrlen += IEEE80211_HT_CTL_LEN;
367 if (ieee80211_is_ctl(fc)) {
369 * ACK and CTS are 10 bytes, all others 16. To see how
370 * to get this condition consider
371 * subtype mask: 0b0000000011110000 (0x00F0)
372 * ACK subtype: 0b0000000011010000 (0x00D0)
373 * CTS subtype: 0b0000000011000000 (0x00C0)
374 * bits that matter: ^^^ (0x00E0)
375 * value of those: 0b0000000011000000 (0x00C0)
377 if ((fc & cpu_to_le16(0x00E0)) == cpu_to_le16(0x00C0))
385 EXPORT_SYMBOL(ieee80211_hdrlen);
387 unsigned int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb)
389 const struct ieee80211_hdr *hdr =
390 (const struct ieee80211_hdr *)skb->data;
393 if (unlikely(skb->len < 10))
395 hdrlen = ieee80211_hdrlen(hdr->frame_control);
396 if (unlikely(hdrlen > skb->len))
400 EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb);
402 static unsigned int __ieee80211_get_mesh_hdrlen(u8 flags)
404 int ae = flags & MESH_FLAGS_AE;
405 /* 802.11-2012, 8.2.4.7.3 */
410 case MESH_FLAGS_AE_A4:
412 case MESH_FLAGS_AE_A5_A6:
417 unsigned int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr)
419 return __ieee80211_get_mesh_hdrlen(meshhdr->flags);
421 EXPORT_SYMBOL(ieee80211_get_mesh_hdrlen);
423 int ieee80211_data_to_8023_exthdr(struct sk_buff *skb, struct ethhdr *ehdr,
424 const u8 *addr, enum nl80211_iftype iftype)
426 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
428 u8 hdr[ETH_ALEN] __aligned(2);
435 if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
438 hdrlen = ieee80211_hdrlen(hdr->frame_control);
439 if (skb->len < hdrlen + 8)
442 /* convert IEEE 802.11 header + possible LLC headers into Ethernet
444 * IEEE 802.11 address fields:
445 * ToDS FromDS Addr1 Addr2 Addr3 Addr4
446 * 0 0 DA SA BSSID n/a
447 * 0 1 DA BSSID SA n/a
448 * 1 0 BSSID SA DA n/a
451 memcpy(tmp.h_dest, ieee80211_get_DA(hdr), ETH_ALEN);
452 memcpy(tmp.h_source, ieee80211_get_SA(hdr), ETH_ALEN);
454 if (iftype == NL80211_IFTYPE_MESH_POINT)
455 skb_copy_bits(skb, hdrlen, &mesh_flags, 1);
457 switch (hdr->frame_control &
458 cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
459 case cpu_to_le16(IEEE80211_FCTL_TODS):
460 if (unlikely(iftype != NL80211_IFTYPE_AP &&
461 iftype != NL80211_IFTYPE_AP_VLAN &&
462 iftype != NL80211_IFTYPE_P2P_GO))
465 case cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
466 if (unlikely(iftype != NL80211_IFTYPE_WDS &&
467 iftype != NL80211_IFTYPE_MESH_POINT &&
468 iftype != NL80211_IFTYPE_AP_VLAN &&
469 iftype != NL80211_IFTYPE_STATION))
471 if (iftype == NL80211_IFTYPE_MESH_POINT) {
472 if (mesh_flags & MESH_FLAGS_AE_A4)
474 if (mesh_flags & MESH_FLAGS_AE_A5_A6) {
475 skb_copy_bits(skb, hdrlen +
476 offsetof(struct ieee80211s_hdr, eaddr1),
477 tmp.h_dest, 2 * ETH_ALEN);
479 hdrlen += __ieee80211_get_mesh_hdrlen(mesh_flags);
482 case cpu_to_le16(IEEE80211_FCTL_FROMDS):
483 if ((iftype != NL80211_IFTYPE_STATION &&
484 iftype != NL80211_IFTYPE_P2P_CLIENT &&
485 iftype != NL80211_IFTYPE_MESH_POINT) ||
486 (is_multicast_ether_addr(tmp.h_dest) &&
487 ether_addr_equal(tmp.h_source, addr)))
489 if (iftype == NL80211_IFTYPE_MESH_POINT) {
490 if (mesh_flags & MESH_FLAGS_AE_A5_A6)
492 if (mesh_flags & MESH_FLAGS_AE_A4)
493 skb_copy_bits(skb, hdrlen +
494 offsetof(struct ieee80211s_hdr, eaddr1),
495 tmp.h_source, ETH_ALEN);
496 hdrlen += __ieee80211_get_mesh_hdrlen(mesh_flags);
500 if (iftype != NL80211_IFTYPE_ADHOC &&
501 iftype != NL80211_IFTYPE_STATION &&
502 iftype != NL80211_IFTYPE_OCB)
507 skb_copy_bits(skb, hdrlen, &payload, sizeof(payload));
508 tmp.h_proto = payload.proto;
510 if (likely((ether_addr_equal(payload.hdr, rfc1042_header) &&
511 tmp.h_proto != htons(ETH_P_AARP) &&
512 tmp.h_proto != htons(ETH_P_IPX)) ||
513 ether_addr_equal(payload.hdr, bridge_tunnel_header)))
514 /* remove RFC1042 or Bridge-Tunnel encapsulation and
515 * replace EtherType */
516 hdrlen += ETH_ALEN + 2;
518 tmp.h_proto = htons(skb->len - hdrlen);
520 pskb_pull(skb, hdrlen);
523 ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr));
524 memcpy(ehdr, &tmp, sizeof(tmp));
528 EXPORT_SYMBOL(ieee80211_data_to_8023_exthdr);
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))
624 memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
625 nh_pos += encaps_len;
629 memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
634 /* Update skb pointers to various headers since this modified frame
635 * is going to go through Linux networking code that may potentially
636 * need things like pointer to IP header. */
637 skb_reset_mac_header(skb);
638 skb_set_network_header(skb, nh_pos);
639 skb_set_transport_header(skb, h_pos);
643 EXPORT_SYMBOL(ieee80211_data_from_8023);
646 __frame_add_frag(struct sk_buff *skb, struct page *page,
647 void *ptr, int len, int size)
649 struct skb_shared_info *sh = skb_shinfo(skb);
653 page_offset = ptr - page_address(page);
654 skb_add_rx_frag(skb, sh->nr_frags, page, page_offset, len, size);
658 __ieee80211_amsdu_copy_frag(struct sk_buff *skb, struct sk_buff *frame,
661 struct skb_shared_info *sh = skb_shinfo(skb);
662 const skb_frag_t *frag = &sh->frags[0];
663 struct page *frag_page;
665 int frag_len, frag_size;
666 int head_size = skb->len - skb->data_len;
669 frag_page = virt_to_head_page(skb->head);
670 frag_ptr = skb->data;
671 frag_size = head_size;
673 while (offset >= frag_size) {
675 frag_page = skb_frag_page(frag);
676 frag_ptr = skb_frag_address(frag);
677 frag_size = skb_frag_size(frag);
682 frag_len = frag_size - offset;
684 cur_len = min(len, frag_len);
686 __frame_add_frag(frame, frag_page, frag_ptr, cur_len, frag_size);
690 frag_len = skb_frag_size(frag);
691 cur_len = min(len, frag_len);
692 __frame_add_frag(frame, skb_frag_page(frag),
693 skb_frag_address(frag), cur_len, frag_len);
699 static struct sk_buff *
700 __ieee80211_amsdu_copy(struct sk_buff *skb, unsigned int hlen,
701 int offset, int len, bool reuse_frag)
703 struct sk_buff *frame;
706 if (skb->len - offset < len)
710 * When reusing framents, copy some data to the head to simplify
711 * ethernet header handling and speed up protocol header processing
712 * in the stack later.
715 cur_len = min_t(int, len, 32);
718 * Allocate and reserve two bytes more for payload
719 * alignment since sizeof(struct ethhdr) is 14.
721 frame = dev_alloc_skb(hlen + sizeof(struct ethhdr) + 2 + cur_len);
725 skb_reserve(frame, hlen + sizeof(struct ethhdr) + 2);
726 skb_copy_bits(skb, offset, skb_put(frame, cur_len), cur_len);
733 __ieee80211_amsdu_copy_frag(skb, frame, offset, len);
738 void ieee80211_amsdu_to_8023s(struct sk_buff *skb, struct sk_buff_head *list,
739 const u8 *addr, enum nl80211_iftype iftype,
740 const unsigned int extra_headroom,
741 const u8 *check_da, const u8 *check_sa)
743 unsigned int hlen = ALIGN(extra_headroom, 4);
744 struct sk_buff *frame = NULL;
747 int offset = 0, remaining;
749 bool reuse_frag = skb->head_frag && !skb_has_frag_list(skb);
750 bool reuse_skb = false;
754 unsigned int subframe_len;
758 skb_copy_bits(skb, offset, ð, sizeof(eth));
759 len = ntohs(eth.h_proto);
760 subframe_len = sizeof(struct ethhdr) + len;
761 padding = (4 - subframe_len) & 0x3;
763 /* the last MSDU has no padding */
764 remaining = skb->len - offset;
765 if (subframe_len > remaining)
768 offset += sizeof(struct ethhdr);
769 last = remaining <= subframe_len + padding;
771 /* FIXME: should we really accept multicast DA? */
772 if ((check_da && !is_multicast_ether_addr(eth.h_dest) &&
773 !ether_addr_equal(check_da, eth.h_dest)) ||
774 (check_sa && !ether_addr_equal(check_sa, eth.h_source))) {
775 offset += len + padding;
779 /* reuse skb for the last subframe */
780 if (!skb_is_nonlinear(skb) && !reuse_frag && last) {
781 skb_pull(skb, offset);
785 frame = __ieee80211_amsdu_copy(skb, hlen, offset, len,
790 offset += len + padding;
793 skb_reset_network_header(frame);
794 frame->dev = skb->dev;
795 frame->priority = skb->priority;
797 payload = frame->data;
798 ethertype = (payload[6] << 8) | payload[7];
799 if (likely((ether_addr_equal(payload, rfc1042_header) &&
800 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
801 ether_addr_equal(payload, bridge_tunnel_header))) {
802 eth.h_proto = htons(ethertype);
803 skb_pull(frame, ETH_ALEN + 2);
806 memcpy(skb_push(frame, sizeof(eth)), ð, sizeof(eth));
807 __skb_queue_tail(list, frame);
816 __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 < CFG80211_MAX_WEP_KEYS; 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 rdev_set_default_key(rdev, dev, i, true, true)) {
919 netdev_err(dev, "failed to set defkey %d\n", i);
924 kzfree(wdev->connect_keys);
925 wdev->connect_keys = NULL;
928 void cfg80211_process_wdev_events(struct wireless_dev *wdev)
930 struct cfg80211_event *ev;
933 spin_lock_irqsave(&wdev->event_lock, flags);
934 while (!list_empty(&wdev->event_list)) {
935 ev = list_first_entry(&wdev->event_list,
936 struct cfg80211_event, list);
938 spin_unlock_irqrestore(&wdev->event_lock, flags);
942 case EVENT_CONNECT_RESULT:
943 __cfg80211_connect_result(
946 ev->cr.status == WLAN_STATUS_SUCCESS);
949 __cfg80211_roamed(wdev, &ev->rm);
951 case EVENT_DISCONNECTED:
952 __cfg80211_disconnected(wdev->netdev,
953 ev->dc.ie, ev->dc.ie_len,
955 !ev->dc.locally_generated);
957 case EVENT_IBSS_JOINED:
958 __cfg80211_ibss_joined(wdev->netdev, ev->ij.bssid,
962 __cfg80211_leave(wiphy_to_rdev(wdev->wiphy), wdev);
969 spin_lock_irqsave(&wdev->event_lock, flags);
971 spin_unlock_irqrestore(&wdev->event_lock, flags);
974 void cfg80211_process_rdev_events(struct cfg80211_registered_device *rdev)
976 struct wireless_dev *wdev;
980 list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list)
981 cfg80211_process_wdev_events(wdev);
984 int cfg80211_change_iface(struct cfg80211_registered_device *rdev,
985 struct net_device *dev, enum nl80211_iftype ntype,
986 struct vif_params *params)
989 enum nl80211_iftype otype = dev->ieee80211_ptr->iftype;
993 /* don't support changing VLANs, you just re-create them */
994 if (otype == NL80211_IFTYPE_AP_VLAN)
997 /* cannot change into P2P device or NAN */
998 if (ntype == NL80211_IFTYPE_P2P_DEVICE ||
999 ntype == NL80211_IFTYPE_NAN)
1002 if (!rdev->ops->change_virtual_intf ||
1003 !(rdev->wiphy.interface_modes & (1 << ntype)))
1006 /* if it's part of a bridge, reject changing type to station/ibss */
1007 if ((dev->priv_flags & IFF_BRIDGE_PORT) &&
1008 (ntype == NL80211_IFTYPE_ADHOC ||
1009 ntype == NL80211_IFTYPE_STATION ||
1010 ntype == NL80211_IFTYPE_P2P_CLIENT))
1013 if (ntype != otype) {
1014 dev->ieee80211_ptr->use_4addr = false;
1015 dev->ieee80211_ptr->mesh_id_up_len = 0;
1016 wdev_lock(dev->ieee80211_ptr);
1017 rdev_set_qos_map(rdev, dev, NULL);
1018 wdev_unlock(dev->ieee80211_ptr);
1021 case NL80211_IFTYPE_AP:
1022 cfg80211_stop_ap(rdev, dev, true);
1024 case NL80211_IFTYPE_ADHOC:
1025 cfg80211_leave_ibss(rdev, dev, false);
1027 case NL80211_IFTYPE_STATION:
1028 case NL80211_IFTYPE_P2P_CLIENT:
1029 wdev_lock(dev->ieee80211_ptr);
1030 cfg80211_disconnect(rdev, dev,
1031 WLAN_REASON_DEAUTH_LEAVING, true);
1032 wdev_unlock(dev->ieee80211_ptr);
1034 case NL80211_IFTYPE_MESH_POINT:
1035 /* mesh should be handled? */
1041 cfg80211_process_rdev_events(rdev);
1044 err = rdev_change_virtual_intf(rdev, dev, ntype, params);
1046 WARN_ON(!err && dev->ieee80211_ptr->iftype != ntype);
1048 if (!err && params && params->use_4addr != -1)
1049 dev->ieee80211_ptr->use_4addr = params->use_4addr;
1052 dev->priv_flags &= ~IFF_DONT_BRIDGE;
1054 case NL80211_IFTYPE_STATION:
1055 if (dev->ieee80211_ptr->use_4addr)
1058 case NL80211_IFTYPE_OCB:
1059 case NL80211_IFTYPE_P2P_CLIENT:
1060 case NL80211_IFTYPE_ADHOC:
1061 dev->priv_flags |= IFF_DONT_BRIDGE;
1063 case NL80211_IFTYPE_P2P_GO:
1064 case NL80211_IFTYPE_AP:
1065 case NL80211_IFTYPE_AP_VLAN:
1066 case NL80211_IFTYPE_WDS:
1067 case NL80211_IFTYPE_MESH_POINT:
1070 case NL80211_IFTYPE_MONITOR:
1071 /* monitor can't bridge anyway */
1073 case NL80211_IFTYPE_UNSPECIFIED:
1074 case NUM_NL80211_IFTYPES:
1077 case NL80211_IFTYPE_P2P_DEVICE:
1078 case NL80211_IFTYPE_NAN:
1084 if (!err && ntype != otype && netif_running(dev)) {
1085 cfg80211_update_iface_num(rdev, ntype, 1);
1086 cfg80211_update_iface_num(rdev, otype, -1);
1092 static u32 cfg80211_calculate_bitrate_ht(struct rate_info *rate)
1094 int modulation, streams, bitrate;
1096 /* the formula below does only work for MCS values smaller than 32 */
1097 if (WARN_ON_ONCE(rate->mcs >= 32))
1100 modulation = rate->mcs & 7;
1101 streams = (rate->mcs >> 3) + 1;
1103 bitrate = (rate->bw == RATE_INFO_BW_40) ? 13500000 : 6500000;
1106 bitrate *= (modulation + 1);
1107 else if (modulation == 4)
1108 bitrate *= (modulation + 2);
1110 bitrate *= (modulation + 3);
1114 if (rate->flags & RATE_INFO_FLAGS_SHORT_GI)
1115 bitrate = (bitrate / 9) * 10;
1117 /* do NOT round down here */
1118 return (bitrate + 50000) / 100000;
1121 static u32 cfg80211_calculate_bitrate_60g(struct rate_info *rate)
1123 static const u32 __mcs2bitrate[] = {
1131 [5] = 12512, /* 1251.25 mbps */
1141 [14] = 8662, /* 866.25 mbps */
1151 [24] = 67568, /* 6756.75 mbps */
1162 if (WARN_ON_ONCE(rate->mcs >= ARRAY_SIZE(__mcs2bitrate)))
1165 return __mcs2bitrate[rate->mcs];
1168 static u32 cfg80211_calculate_bitrate_vht(struct rate_info *rate)
1170 static const u32 base[4][10] = {
1180 /* not in the spec, but some devices use this: */
1220 if (WARN_ON_ONCE(rate->mcs > 9))
1224 case RATE_INFO_BW_160:
1227 case RATE_INFO_BW_80:
1230 case RATE_INFO_BW_40:
1233 case RATE_INFO_BW_5:
1234 case RATE_INFO_BW_10:
1238 case RATE_INFO_BW_20:
1242 bitrate = base[idx][rate->mcs];
1243 bitrate *= rate->nss;
1245 if (rate->flags & RATE_INFO_FLAGS_SHORT_GI)
1246 bitrate = (bitrate / 9) * 10;
1248 /* do NOT round down here */
1249 return (bitrate + 50000) / 100000;
1252 u32 cfg80211_calculate_bitrate(struct rate_info *rate)
1254 if (rate->flags & RATE_INFO_FLAGS_MCS)
1255 return cfg80211_calculate_bitrate_ht(rate);
1256 if (rate->flags & RATE_INFO_FLAGS_60G)
1257 return cfg80211_calculate_bitrate_60g(rate);
1258 if (rate->flags & RATE_INFO_FLAGS_VHT_MCS)
1259 return cfg80211_calculate_bitrate_vht(rate);
1261 return rate->legacy;
1263 EXPORT_SYMBOL(cfg80211_calculate_bitrate);
1265 int cfg80211_get_p2p_attr(const u8 *ies, unsigned int len,
1266 enum ieee80211_p2p_attr_id attr,
1267 u8 *buf, unsigned int bufsize)
1270 u16 attr_remaining = 0;
1271 bool desired_attr = false;
1272 u16 desired_len = 0;
1275 unsigned int iedatalen;
1282 if (iedatalen + 2 > len)
1285 if (ies[0] != WLAN_EID_VENDOR_SPECIFIC)
1293 /* check WFA OUI, P2P subtype */
1294 if (iedata[0] != 0x50 || iedata[1] != 0x6f ||
1295 iedata[2] != 0x9a || iedata[3] != 0x09)
1301 /* check attribute continuation into this IE */
1302 copy = min_t(unsigned int, attr_remaining, iedatalen);
1303 if (copy && desired_attr) {
1304 desired_len += copy;
1306 memcpy(out, iedata, min(bufsize, copy));
1307 out += min(bufsize, copy);
1308 bufsize -= min(bufsize, copy);
1312 if (copy == attr_remaining)
1316 attr_remaining -= copy;
1323 while (iedatalen > 0) {
1326 /* P2P attribute ID & size must fit */
1329 desired_attr = iedata[0] == attr;
1330 attr_len = get_unaligned_le16(iedata + 1);
1334 copy = min_t(unsigned int, attr_len, iedatalen);
1337 desired_len += copy;
1339 memcpy(out, iedata, min(bufsize, copy));
1340 out += min(bufsize, copy);
1341 bufsize -= min(bufsize, copy);
1344 if (copy == attr_len)
1350 attr_remaining = attr_len - copy;
1358 if (attr_remaining && desired_attr)
1363 EXPORT_SYMBOL(cfg80211_get_p2p_attr);
1365 static bool ieee80211_id_in_list(const u8 *ids, int n_ids, u8 id)
1369 for (i = 0; i < n_ids; i++)
1375 static size_t skip_ie(const u8 *ies, size_t ielen, size_t pos)
1377 /* we assume a validly formed IEs buffer */
1378 u8 len = ies[pos + 1];
1382 /* the IE itself must have 255 bytes for fragments to follow */
1386 while (pos < ielen && ies[pos] == WLAN_EID_FRAGMENT) {
1394 size_t ieee80211_ie_split_ric(const u8 *ies, size_t ielen,
1395 const u8 *ids, int n_ids,
1396 const u8 *after_ric, int n_after_ric,
1399 size_t pos = offset;
1401 while (pos < ielen && ieee80211_id_in_list(ids, n_ids, ies[pos])) {
1402 if (ies[pos] == WLAN_EID_RIC_DATA && n_after_ric) {
1403 pos = skip_ie(ies, ielen, pos);
1405 while (pos < ielen &&
1406 !ieee80211_id_in_list(after_ric, n_after_ric,
1408 pos = skip_ie(ies, ielen, pos);
1410 pos = skip_ie(ies, ielen, pos);
1416 EXPORT_SYMBOL(ieee80211_ie_split_ric);
1418 bool ieee80211_operating_class_to_band(u8 operating_class,
1419 enum nl80211_band *band)
1421 switch (operating_class) {
1425 *band = NL80211_BAND_5GHZ;
1431 *band = NL80211_BAND_2GHZ;
1434 *band = NL80211_BAND_60GHZ;
1440 EXPORT_SYMBOL(ieee80211_operating_class_to_band);
1442 bool ieee80211_chandef_to_operating_class(struct cfg80211_chan_def *chandef,
1446 u16 freq = chandef->center_freq1;
1448 if (freq >= 2412 && freq <= 2472) {
1449 if (chandef->width > NL80211_CHAN_WIDTH_40)
1452 /* 2.407 GHz, channels 1..13 */
1453 if (chandef->width == NL80211_CHAN_WIDTH_40) {
1454 if (freq > chandef->chan->center_freq)
1455 *op_class = 83; /* HT40+ */
1457 *op_class = 84; /* HT40- */
1466 if (chandef->width > NL80211_CHAN_WIDTH_40)
1469 *op_class = 82; /* channel 14 */
1473 switch (chandef->width) {
1474 case NL80211_CHAN_WIDTH_80:
1477 case NL80211_CHAN_WIDTH_160:
1480 case NL80211_CHAN_WIDTH_80P80:
1483 case NL80211_CHAN_WIDTH_10:
1484 case NL80211_CHAN_WIDTH_5:
1485 return false; /* unsupported for now */
1491 /* 5 GHz, channels 36..48 */
1492 if (freq >= 5180 && freq <= 5240) {
1494 *op_class = vht_opclass;
1495 } else if (chandef->width == NL80211_CHAN_WIDTH_40) {
1496 if (freq > chandef->chan->center_freq)
1507 /* 5 GHz, channels 52..64 */
1508 if (freq >= 5260 && freq <= 5320) {
1510 *op_class = vht_opclass;
1511 } else if (chandef->width == NL80211_CHAN_WIDTH_40) {
1512 if (freq > chandef->chan->center_freq)
1523 /* 5 GHz, channels 100..144 */
1524 if (freq >= 5500 && freq <= 5720) {
1526 *op_class = vht_opclass;
1527 } else if (chandef->width == NL80211_CHAN_WIDTH_40) {
1528 if (freq > chandef->chan->center_freq)
1539 /* 5 GHz, channels 149..169 */
1540 if (freq >= 5745 && freq <= 5845) {
1542 *op_class = vht_opclass;
1543 } else if (chandef->width == NL80211_CHAN_WIDTH_40) {
1544 if (freq > chandef->chan->center_freq)
1548 } else if (freq <= 5805) {
1557 /* 56.16 GHz, channel 1..4 */
1558 if (freq >= 56160 + 2160 * 1 && freq <= 56160 + 2160 * 4) {
1559 if (chandef->width >= NL80211_CHAN_WIDTH_40)
1566 /* not supported yet */
1569 EXPORT_SYMBOL(ieee80211_chandef_to_operating_class);
1571 static void cfg80211_calculate_bi_data(struct wiphy *wiphy, u32 new_beacon_int,
1572 u32 *beacon_int_gcd,
1573 bool *beacon_int_different)
1575 struct wireless_dev *wdev;
1577 *beacon_int_gcd = 0;
1578 *beacon_int_different = false;
1580 list_for_each_entry(wdev, &wiphy->wdev_list, list) {
1581 if (!wdev->beacon_interval)
1584 if (!*beacon_int_gcd) {
1585 *beacon_int_gcd = wdev->beacon_interval;
1589 if (wdev->beacon_interval == *beacon_int_gcd)
1592 *beacon_int_different = true;
1593 *beacon_int_gcd = gcd(*beacon_int_gcd, wdev->beacon_interval);
1596 if (new_beacon_int && *beacon_int_gcd != new_beacon_int) {
1597 if (*beacon_int_gcd)
1598 *beacon_int_different = true;
1599 *beacon_int_gcd = gcd(*beacon_int_gcd, new_beacon_int);
1603 int cfg80211_validate_beacon_int(struct cfg80211_registered_device *rdev,
1604 enum nl80211_iftype iftype, u32 beacon_int)
1607 * This is just a basic pre-condition check; if interface combinations
1608 * are possible the driver must already be checking those with a call
1609 * to cfg80211_check_combinations(), in which case we'll validate more
1610 * through the cfg80211_calculate_bi_data() call and code in
1611 * cfg80211_iter_combinations().
1614 if (beacon_int < 10 || beacon_int > 10000)
1620 int cfg80211_iter_combinations(struct wiphy *wiphy,
1621 struct iface_combination_params *params,
1622 void (*iter)(const struct ieee80211_iface_combination *c,
1626 const struct ieee80211_regdomain *regdom;
1627 enum nl80211_dfs_regions region = 0;
1629 int num_interfaces = 0;
1630 u32 used_iftypes = 0;
1632 bool beacon_int_different;
1635 * This is a bit strange, since the iteration used to rely only on
1636 * the data given by the driver, but here it now relies on context,
1637 * in form of the currently operating interfaces.
1638 * This is OK for all current users, and saves us from having to
1639 * push the GCD calculations into all the drivers.
1640 * In the future, this should probably rely more on data that's in
1641 * cfg80211 already - the only thing not would appear to be any new
1642 * interfaces (while being brought up) and channel/radar data.
1644 cfg80211_calculate_bi_data(wiphy, params->new_beacon_int,
1645 &beacon_int_gcd, &beacon_int_different);
1647 if (params->radar_detect) {
1649 regdom = rcu_dereference(cfg80211_regdomain);
1651 region = regdom->dfs_region;
1655 for (iftype = 0; iftype < NUM_NL80211_IFTYPES; iftype++) {
1656 num_interfaces += params->iftype_num[iftype];
1657 if (params->iftype_num[iftype] > 0 &&
1658 !(wiphy->software_iftypes & BIT(iftype)))
1659 used_iftypes |= BIT(iftype);
1662 for (i = 0; i < wiphy->n_iface_combinations; i++) {
1663 const struct ieee80211_iface_combination *c;
1664 struct ieee80211_iface_limit *limits;
1665 u32 all_iftypes = 0;
1667 c = &wiphy->iface_combinations[i];
1669 if (num_interfaces > c->max_interfaces)
1671 if (params->num_different_channels > c->num_different_channels)
1674 limits = kmemdup(c->limits, sizeof(limits[0]) * c->n_limits,
1679 for (iftype = 0; iftype < NUM_NL80211_IFTYPES; iftype++) {
1680 if (wiphy->software_iftypes & BIT(iftype))
1682 for (j = 0; j < c->n_limits; j++) {
1683 all_iftypes |= limits[j].types;
1684 if (!(limits[j].types & BIT(iftype)))
1686 if (limits[j].max < params->iftype_num[iftype])
1688 limits[j].max -= params->iftype_num[iftype];
1692 if (params->radar_detect !=
1693 (c->radar_detect_widths & params->radar_detect))
1696 if (params->radar_detect && c->radar_detect_regions &&
1697 !(c->radar_detect_regions & BIT(region)))
1700 /* Finally check that all iftypes that we're currently
1701 * using are actually part of this combination. If they
1702 * aren't then we can't use this combination and have
1703 * to continue to the next.
1705 if ((all_iftypes & used_iftypes) != used_iftypes)
1708 if (beacon_int_gcd) {
1709 if (c->beacon_int_min_gcd &&
1710 beacon_int_gcd < c->beacon_int_min_gcd)
1712 if (!c->beacon_int_min_gcd && beacon_int_different)
1716 /* This combination covered all interface types and
1717 * supported the requested numbers, so we're good.
1727 EXPORT_SYMBOL(cfg80211_iter_combinations);
1730 cfg80211_iter_sum_ifcombs(const struct ieee80211_iface_combination *c,
1737 int cfg80211_check_combinations(struct wiphy *wiphy,
1738 struct iface_combination_params *params)
1742 err = cfg80211_iter_combinations(wiphy, params,
1743 cfg80211_iter_sum_ifcombs, &num);
1751 EXPORT_SYMBOL(cfg80211_check_combinations);
1753 int ieee80211_get_ratemask(struct ieee80211_supported_band *sband,
1754 const u8 *rates, unsigned int n_rates,
1762 if (n_rates == 0 || n_rates > NL80211_MAX_SUPP_RATES)
1767 for (i = 0; i < n_rates; i++) {
1768 int rate = (rates[i] & 0x7f) * 5;
1771 for (j = 0; j < sband->n_bitrates; j++) {
1772 if (sband->bitrates[j].bitrate == rate) {
1783 * mask must have at least one bit set here since we
1784 * didn't accept a 0-length rates array nor allowed
1785 * entries in the array that didn't exist
1791 unsigned int ieee80211_get_num_supported_channels(struct wiphy *wiphy)
1793 enum nl80211_band band;
1794 unsigned int n_channels = 0;
1796 for (band = 0; band < NUM_NL80211_BANDS; band++)
1797 if (wiphy->bands[band])
1798 n_channels += wiphy->bands[band]->n_channels;
1802 EXPORT_SYMBOL(ieee80211_get_num_supported_channels);
1804 int cfg80211_get_station(struct net_device *dev, const u8 *mac_addr,
1805 struct station_info *sinfo)
1807 struct cfg80211_registered_device *rdev;
1808 struct wireless_dev *wdev;
1810 wdev = dev->ieee80211_ptr;
1814 rdev = wiphy_to_rdev(wdev->wiphy);
1815 if (!rdev->ops->get_station)
1818 return rdev_get_station(rdev, dev, mac_addr, sinfo);
1820 EXPORT_SYMBOL(cfg80211_get_station);
1822 void cfg80211_free_nan_func(struct cfg80211_nan_func *f)
1829 kfree(f->serv_spec_info);
1832 for (i = 0; i < f->num_rx_filters; i++)
1833 kfree(f->rx_filters[i].filter);
1835 for (i = 0; i < f->num_tx_filters; i++)
1836 kfree(f->tx_filters[i].filter);
1838 kfree(f->rx_filters);
1839 kfree(f->tx_filters);
1842 EXPORT_SYMBOL(cfg80211_free_nan_func);
1844 bool cfg80211_does_bw_fit_range(const struct ieee80211_freq_range *freq_range,
1845 u32 center_freq_khz, u32 bw_khz)
1847 u32 start_freq_khz, end_freq_khz;
1849 start_freq_khz = center_freq_khz - (bw_khz / 2);
1850 end_freq_khz = center_freq_khz + (bw_khz / 2);
1852 if (start_freq_khz >= freq_range->start_freq_khz &&
1853 end_freq_khz <= freq_range->end_freq_khz)
1859 /* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
1860 /* Ethernet-II snap header (RFC1042 for most EtherTypes) */
1861 const unsigned char rfc1042_header[] __aligned(2) =
1862 { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
1863 EXPORT_SYMBOL(rfc1042_header);
1865 /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
1866 const unsigned char bridge_tunnel_header[] __aligned(2) =
1867 { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
1868 EXPORT_SYMBOL(bridge_tunnel_header);