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80279fb7ba
linux/net/wireless/util.c
Johannes Berg 80279fb7ba cfg80211: properly send NL80211_ATTR_DISCONNECTED_BY_AP in disconnect 
When we disconnect from the AP, drivers call cfg80211_disconnect().
This doesn't know whether the disconnection was initiated locally
or by the AP though, which can cause problems with the supplicant,
for example with WPS. This issue obviously doesn't show up with any
mac80211 based driver since mac80211 doesn't call this function.

Fix this by requiring drivers to indicate whether the disconnect is
locally generated or not. I've tried to update the drivers, but may
not have gotten the values correct, and some drivers may currently
not be able to report correct values. In case of doubt I left it at
false, which is the current behaviour.

For libertas, make adjustments as indicated by Dan Williams.

Reported-by: Matthieu Mauger <matthieux.mauger@intel.com>
Tested-by: Matthieu Mauger <matthieux.mauger@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
2015-05-26 15:21:27 +02:00

1816 lines
43 KiB
C
Raw Blame History

/*
* Wireless utility functions
*
* Copyright 2007-2009 Johannes Berg <johannes@sipsolutions.net>
* Copyright 2013-2014 Intel Mobile Communications GmbH
*/
#include <linux/export.h>
#include <linux/bitops.h>
#include <linux/etherdevice.h>
#include <linux/slab.h>
#include <net/cfg80211.h>
#include <net/ip.h>
#include <net/dsfield.h>
#include <linux/if_vlan.h>
#include <linux/mpls.h>
#include "core.h"
#include "rdev-ops.h"
struct ieee80211_rate *
ieee80211_get_response_rate(struct ieee80211_supported_band *sband,
u32 basic_rates, int bitrate)
{
struct ieee80211_rate *result = &sband->bitrates[0];
int i;
for (i = 0; i < sband->n_bitrates; i++) {
if (!(basic_rates & BIT(i)))
continue;
if (sband->bitrates[i].bitrate > bitrate)
continue;
result = &sband->bitrates[i];
}
return result;
}
EXPORT_SYMBOL(ieee80211_get_response_rate);
u32 ieee80211_mandatory_rates(struct ieee80211_supported_band *sband,
enum nl80211_bss_scan_width scan_width)
{
struct ieee80211_rate *bitrates;
u32 mandatory_rates = 0;
enum ieee80211_rate_flags mandatory_flag;
int i;
if (WARN_ON(!sband))
return 1;
if (sband->band == IEEE80211_BAND_2GHZ) {
if (scan_width == NL80211_BSS_CHAN_WIDTH_5 ||
scan_width == NL80211_BSS_CHAN_WIDTH_10)
mandatory_flag = IEEE80211_RATE_MANDATORY_G;
else
mandatory_flag = IEEE80211_RATE_MANDATORY_B;
} else {
mandatory_flag = IEEE80211_RATE_MANDATORY_A;
}
bitrates = sband->bitrates;
for (i = 0; i < sband->n_bitrates; i++)
if (bitrates[i].flags & mandatory_flag)
mandatory_rates |= BIT(i);
return mandatory_rates;
}
EXPORT_SYMBOL(ieee80211_mandatory_rates);
int ieee80211_channel_to_frequency(int chan, enum ieee80211_band band)
{
/* see 802.11 17.3.8.3.2 and Annex J
* there are overlapping channel numbers in 5GHz and 2GHz bands */
if (chan <= 0)
return 0; /* not supported */
switch (band) {
case IEEE80211_BAND_2GHZ:
if (chan == 14)
return 2484;
else if (chan < 14)
return 2407 + chan * 5;
break;
case IEEE80211_BAND_5GHZ:
if (chan >= 182 && chan <= 196)
return 4000 + chan * 5;
else
return 5000 + chan * 5;
break;
case IEEE80211_BAND_60GHZ:
if (chan < 5)
return 56160 + chan * 2160;
break;
default:
;
}
return 0; /* not supported */
}
EXPORT_SYMBOL(ieee80211_channel_to_frequency);
int ieee80211_frequency_to_channel(int freq)
{
/* see 802.11 17.3.8.3.2 and Annex J */
if (freq == 2484)
return 14;
else if (freq < 2484)
return (freq - 2407) / 5;
else if (freq >= 4910 && freq <= 4980)
return (freq - 4000) / 5;
else if (freq <= 45000) /* DMG band lower limit */
return (freq - 5000) / 5;
else if (freq >= 58320 && freq <= 64800)
return (freq - 56160) / 2160;
else
return 0;
}
EXPORT_SYMBOL(ieee80211_frequency_to_channel);
struct ieee80211_channel *__ieee80211_get_channel(struct wiphy *wiphy,
int freq)
{
enum ieee80211_band band;
struct ieee80211_supported_band *sband;
int i;
for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
sband = wiphy->bands[band];
if (!sband)
continue;
for (i = 0; i < sband->n_channels; i++) {
if (sband->channels[i].center_freq == freq)
return &sband->channels[i];
}
}
return NULL;
}
EXPORT_SYMBOL(__ieee80211_get_channel);
static void set_mandatory_flags_band(struct ieee80211_supported_band *sband,
enum ieee80211_band band)
{
int i, want;
switch (band) {
case IEEE80211_BAND_5GHZ:
want = 3;
for (i = 0; i < sband->n_bitrates; i++) {
if (sband->bitrates[i].bitrate == 60 ||
sband->bitrates[i].bitrate == 120 ||
sband->bitrates[i].bitrate == 240) {
sband->bitrates[i].flags |=
IEEE80211_RATE_MANDATORY_A;
want--;
}
}
WARN_ON(want);
break;
case IEEE80211_BAND_2GHZ:
want = 7;
for (i = 0; i < sband->n_bitrates; i++) {
if (sband->bitrates[i].bitrate == 10) {
sband->bitrates[i].flags |=
IEEE80211_RATE_MANDATORY_B |
IEEE80211_RATE_MANDATORY_G;
want--;
}
if (sband->bitrates[i].bitrate == 20 ||
sband->bitrates[i].bitrate == 55 ||
sband->bitrates[i].bitrate == 110 ||
sband->bitrates[i].bitrate == 60 ||
sband->bitrates[i].bitrate == 120 ||
sband->bitrates[i].bitrate == 240) {
sband->bitrates[i].flags |=
IEEE80211_RATE_MANDATORY_G;
want--;
}
if (sband->bitrates[i].bitrate != 10 &&
sband->bitrates[i].bitrate != 20 &&
sband->bitrates[i].bitrate != 55 &&
sband->bitrates[i].bitrate != 110)
sband->bitrates[i].flags |=
IEEE80211_RATE_ERP_G;
}
WARN_ON(want != 0 && want != 3 && want != 6);
break;
case IEEE80211_BAND_60GHZ:
/* check for mandatory HT MCS 1..4 */
WARN_ON(!sband->ht_cap.ht_supported);
WARN_ON((sband->ht_cap.mcs.rx_mask[0] & 0x1e) != 0x1e);
break;
case IEEE80211_NUM_BANDS:
WARN_ON(1);
break;
}
}
void ieee80211_set_bitrate_flags(struct wiphy *wiphy)
{
enum ieee80211_band band;
for (band = 0; band < IEEE80211_NUM_BANDS; band++)
if (wiphy->bands[band])
set_mandatory_flags_band(wiphy->bands[band], band);
}
bool cfg80211_supported_cipher_suite(struct wiphy *wiphy, u32 cipher)
{
int i;
for (i = 0; i < wiphy->n_cipher_suites; i++)
if (cipher == wiphy->cipher_suites[i])
return true;
return false;
}
int cfg80211_validate_key_settings(struct cfg80211_registered_device *rdev,
struct key_params *params, int key_idx,
bool pairwise, const u8 *mac_addr)
{
if (key_idx > 5)
return -EINVAL;
if (!pairwise && mac_addr && !(rdev->wiphy.flags & WIPHY_FLAG_IBSS_RSN))
return -EINVAL;
if (pairwise && !mac_addr)
return -EINVAL;
switch (params->cipher) {
case WLAN_CIPHER_SUITE_TKIP:
case WLAN_CIPHER_SUITE_CCMP:
case WLAN_CIPHER_SUITE_CCMP_256:
case WLAN_CIPHER_SUITE_GCMP:
case WLAN_CIPHER_SUITE_GCMP_256:
/* Disallow pairwise keys with non-zero index unless it's WEP
* or a vendor specific cipher (because current deployments use
* pairwise WEP keys with non-zero indices and for vendor
* specific ciphers this should be validated in the driver or
* hardware level - but 802.11i clearly specifies to use zero)
*/
if (pairwise && key_idx)
return -EINVAL;
break;
case WLAN_CIPHER_SUITE_AES_CMAC:
case WLAN_CIPHER_SUITE_BIP_CMAC_256:
case WLAN_CIPHER_SUITE_BIP_GMAC_128:
case WLAN_CIPHER_SUITE_BIP_GMAC_256:
/* Disallow BIP (group-only) cipher as pairwise cipher */
if (pairwise)
return -EINVAL;
break;
default:
break;
}
switch (params->cipher) {
case WLAN_CIPHER_SUITE_WEP40:
if (params->key_len != WLAN_KEY_LEN_WEP40)
return -EINVAL;
break;
case WLAN_CIPHER_SUITE_TKIP:
if (params->key_len != WLAN_KEY_LEN_TKIP)
return -EINVAL;
break;
case WLAN_CIPHER_SUITE_CCMP:
if (params->key_len != WLAN_KEY_LEN_CCMP)
return -EINVAL;
break;
case WLAN_CIPHER_SUITE_CCMP_256:
if (params->key_len != WLAN_KEY_LEN_CCMP_256)
return -EINVAL;
break;
case WLAN_CIPHER_SUITE_GCMP:
if (params->key_len != WLAN_KEY_LEN_GCMP)
return -EINVAL;
break;
case WLAN_CIPHER_SUITE_GCMP_256:
if (params->key_len != WLAN_KEY_LEN_GCMP_256)
return -EINVAL;
break;
case WLAN_CIPHER_SUITE_WEP104:
if (params->key_len != WLAN_KEY_LEN_WEP104)
return -EINVAL;
break;
case WLAN_CIPHER_SUITE_AES_CMAC:
if (params->key_len != WLAN_KEY_LEN_AES_CMAC)
return -EINVAL;
break;
case WLAN_CIPHER_SUITE_BIP_CMAC_256:
if (params->key_len != WLAN_KEY_LEN_BIP_CMAC_256)
return -EINVAL;
break;
case WLAN_CIPHER_SUITE_BIP_GMAC_128:
if (params->key_len != WLAN_KEY_LEN_BIP_GMAC_128)
return -EINVAL;
break;
case WLAN_CIPHER_SUITE_BIP_GMAC_256:
if (params->key_len != WLAN_KEY_LEN_BIP_GMAC_256)
return -EINVAL;
break;
default:
/*
* We don't know anything about this algorithm,
* allow using it -- but the driver must check
* all parameters! We still check below whether
* or not the driver supports this algorithm,
* of course.
*/
break;
}
if (params->seq) {
switch (params->cipher) {
case WLAN_CIPHER_SUITE_WEP40:
case WLAN_CIPHER_SUITE_WEP104:
/* These ciphers do not use key sequence */
return -EINVAL;
case WLAN_CIPHER_SUITE_TKIP:
case WLAN_CIPHER_SUITE_CCMP:
case WLAN_CIPHER_SUITE_CCMP_256:
case WLAN_CIPHER_SUITE_GCMP:
case WLAN_CIPHER_SUITE_GCMP_256:
case WLAN_CIPHER_SUITE_AES_CMAC:
case WLAN_CIPHER_SUITE_BIP_CMAC_256:
case WLAN_CIPHER_SUITE_BIP_GMAC_128:
case WLAN_CIPHER_SUITE_BIP_GMAC_256:
if (params->seq_len != 6)
return -EINVAL;
break;
}
}
if (!cfg80211_supported_cipher_suite(&rdev->wiphy, params->cipher))
return -EINVAL;
return 0;
}
unsigned int __attribute_const__ ieee80211_hdrlen(__le16 fc)
{
unsigned int hdrlen = 24;
if (ieee80211_is_data(fc)) {
if (ieee80211_has_a4(fc))
hdrlen = 30;
if (ieee80211_is_data_qos(fc)) {
hdrlen += IEEE80211_QOS_CTL_LEN;
if (ieee80211_has_order(fc))
hdrlen += IEEE80211_HT_CTL_LEN;
}
goto out;
}
if (ieee80211_is_mgmt(fc)) {
if (ieee80211_has_order(fc))
hdrlen += IEEE80211_HT_CTL_LEN;
goto out;
}
if (ieee80211_is_ctl(fc)) {
/*
* ACK and CTS are 10 bytes, all others 16. To see how
* to get this condition consider
* subtype mask: 0b0000000011110000 (0x00F0)
* ACK subtype: 0b0000000011010000 (0x00D0)
* CTS subtype: 0b0000000011000000 (0x00C0)
* bits that matter: ^^^ (0x00E0)
* value of those: 0b0000000011000000 (0x00C0)
*/
if ((fc & cpu_to_le16(0x00E0)) == cpu_to_le16(0x00C0))
hdrlen = 10;
else
hdrlen = 16;
}
out:
return hdrlen;
}
EXPORT_SYMBOL(ieee80211_hdrlen);
unsigned int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb)
{
const struct ieee80211_hdr *hdr =
(const struct ieee80211_hdr *)skb->data;
unsigned int hdrlen;
if (unlikely(skb->len < 10))
return 0;
hdrlen = ieee80211_hdrlen(hdr->frame_control);
if (unlikely(hdrlen > skb->len))
return 0;
return hdrlen;
}
EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb);
unsigned int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr)
{
int ae = meshhdr->flags & MESH_FLAGS_AE;
/* 802.11-2012, 8.2.4.7.3 */
switch (ae) {
default:
case 0:
return 6;
case MESH_FLAGS_AE_A4:
return 12;
case MESH_FLAGS_AE_A5_A6:
return 18;
}
}
EXPORT_SYMBOL(ieee80211_get_mesh_hdrlen);
int ieee80211_data_to_8023(struct sk_buff *skb, const u8 *addr,
enum nl80211_iftype iftype)
{
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
u16 hdrlen, ethertype;
u8 *payload;
u8 dst[ETH_ALEN];
u8 src[ETH_ALEN] __aligned(2);
if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
return -1;
hdrlen = ieee80211_hdrlen(hdr->frame_control);
/* convert IEEE 802.11 header + possible LLC headers into Ethernet
* header
* IEEE 802.11 address fields:
* ToDS FromDS Addr1 Addr2 Addr3 Addr4
* 0 0 DA SA BSSID n/a
* 0 1 DA BSSID SA n/a
* 1 0 BSSID SA DA n/a
* 1 1 RA TA DA SA
*/
memcpy(dst, ieee80211_get_DA(hdr), ETH_ALEN);
memcpy(src, ieee80211_get_SA(hdr), ETH_ALEN);
switch (hdr->frame_control &
cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
case cpu_to_le16(IEEE80211_FCTL_TODS):
if (unlikely(iftype != NL80211_IFTYPE_AP &&
iftype != NL80211_IFTYPE_AP_VLAN &&
iftype != NL80211_IFTYPE_P2P_GO))
return -1;
break;
case cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
if (unlikely(iftype != NL80211_IFTYPE_WDS &&
iftype != NL80211_IFTYPE_MESH_POINT &&
iftype != NL80211_IFTYPE_AP_VLAN &&
iftype != NL80211_IFTYPE_STATION))
return -1;
if (iftype == NL80211_IFTYPE_MESH_POINT) {
struct ieee80211s_hdr *meshdr =
(struct ieee80211s_hdr *) (skb->data + hdrlen);
/* make sure meshdr->flags is on the linear part */
if (!pskb_may_pull(skb, hdrlen + 1))
return -1;
if (meshdr->flags & MESH_FLAGS_AE_A4)
return -1;
if (meshdr->flags & MESH_FLAGS_AE_A5_A6) {
skb_copy_bits(skb, hdrlen +
offsetof(struct ieee80211s_hdr, eaddr1),
dst, ETH_ALEN);
skb_copy_bits(skb, hdrlen +
offsetof(struct ieee80211s_hdr, eaddr2),
src, ETH_ALEN);
}
hdrlen += ieee80211_get_mesh_hdrlen(meshdr);
}
break;
case cpu_to_le16(IEEE80211_FCTL_FROMDS):
if ((iftype != NL80211_IFTYPE_STATION &&
iftype != NL80211_IFTYPE_P2P_CLIENT &&
iftype != NL80211_IFTYPE_MESH_POINT) ||
(is_multicast_ether_addr(dst) &&
ether_addr_equal(src, addr)))
return -1;
if (iftype == NL80211_IFTYPE_MESH_POINT) {
struct ieee80211s_hdr *meshdr =
(struct ieee80211s_hdr *) (skb->data + hdrlen);
/* make sure meshdr->flags is on the linear part */
if (!pskb_may_pull(skb, hdrlen + 1))
return -1;
if (meshdr->flags & MESH_FLAGS_AE_A5_A6)
return -1;
if (meshdr->flags & MESH_FLAGS_AE_A4)
skb_copy_bits(skb, hdrlen +
offsetof(struct ieee80211s_hdr, eaddr1),
src, ETH_ALEN);
hdrlen += ieee80211_get_mesh_hdrlen(meshdr);
}
break;
case cpu_to_le16(0):
if (iftype != NL80211_IFTYPE_ADHOC &&
iftype != NL80211_IFTYPE_STATION &&
iftype != NL80211_IFTYPE_OCB)
return -1;
break;
}
if (!pskb_may_pull(skb, hdrlen + 8))
return -1;
payload = skb->data + hdrlen;
ethertype = (payload[6] << 8) | payload[7];
if (likely((ether_addr_equal(payload, rfc1042_header) &&
ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
ether_addr_equal(payload, bridge_tunnel_header))) {
/* remove RFC1042 or Bridge-Tunnel encapsulation and
* replace EtherType */
skb_pull(skb, hdrlen + 6);
memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
} else {
struct ethhdr *ehdr;
__be16 len;
skb_pull(skb, hdrlen);
len = htons(skb->len);
ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr));
memcpy(ehdr->h_dest, dst, ETH_ALEN);
memcpy(ehdr->h_source, src, ETH_ALEN);
ehdr->h_proto = len;
}
return 0;
}
EXPORT_SYMBOL(ieee80211_data_to_8023);
int ieee80211_data_from_8023(struct sk_buff *skb, const u8 *addr,
enum nl80211_iftype iftype,
const u8 *bssid, bool qos)
{
struct ieee80211_hdr hdr;
u16 hdrlen, ethertype;
__le16 fc;
const u8 *encaps_data;
int encaps_len, skip_header_bytes;
int nh_pos, h_pos;
int head_need;
if (unlikely(skb->len < ETH_HLEN))
return -EINVAL;
nh_pos = skb_network_header(skb) - skb->data;
h_pos = skb_transport_header(skb) - skb->data;
/* convert Ethernet header to proper 802.11 header (based on
* operation mode) */
ethertype = (skb->data[12] << 8) | skb->data[13];
fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
switch (iftype) {
case NL80211_IFTYPE_AP:
case NL80211_IFTYPE_AP_VLAN:
case NL80211_IFTYPE_P2P_GO:
fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
/* DA BSSID SA */
memcpy(hdr.addr1, skb->data, ETH_ALEN);
memcpy(hdr.addr2, addr, ETH_ALEN);
memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
hdrlen = 24;
break;
case NL80211_IFTYPE_STATION:
case NL80211_IFTYPE_P2P_CLIENT:
fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
/* BSSID SA DA */
memcpy(hdr.addr1, bssid, ETH_ALEN);
memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
memcpy(hdr.addr3, skb->data, ETH_ALEN);
hdrlen = 24;
break;
case NL80211_IFTYPE_OCB:
case NL80211_IFTYPE_ADHOC:
/* DA SA BSSID */
memcpy(hdr.addr1, skb->data, ETH_ALEN);
memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
memcpy(hdr.addr3, bssid, ETH_ALEN);
hdrlen = 24;
break;
default:
return -EOPNOTSUPP;
}
if (qos) {
fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
hdrlen += 2;
}
hdr.frame_control = fc;
hdr.duration_id = 0;
hdr.seq_ctrl = 0;
skip_header_bytes = ETH_HLEN;
if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
encaps_data = bridge_tunnel_header;
encaps_len = sizeof(bridge_tunnel_header);
skip_header_bytes -= 2;
} else if (ethertype >= ETH_P_802_3_MIN) {
encaps_data = rfc1042_header;
encaps_len = sizeof(rfc1042_header);
skip_header_bytes -= 2;
} else {
encaps_data = NULL;
encaps_len = 0;
}
skb_pull(skb, skip_header_bytes);
nh_pos -= skip_header_bytes;
h_pos -= skip_header_bytes;
head_need = hdrlen + encaps_len - skb_headroom(skb);
if (head_need > 0 || skb_cloned(skb)) {
head_need = max(head_need, 0);
if (head_need)
skb_orphan(skb);
if (pskb_expand_head(skb, head_need, 0, GFP_ATOMIC))
return -ENOMEM;
skb->truesize += head_need;
}
if (encaps_data) {
memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
nh_pos += encaps_len;
h_pos += encaps_len;
}
memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
nh_pos += hdrlen;
h_pos += hdrlen;
/* Update skb pointers to various headers since this modified frame
* is going to go through Linux networking code that may potentially
* need things like pointer to IP header. */
skb_set_mac_header(skb, 0);
skb_set_network_header(skb, nh_pos);
skb_set_transport_header(skb, h_pos);
return 0;
}
EXPORT_SYMBOL(ieee80211_data_from_8023);
void ieee80211_amsdu_to_8023s(struct sk_buff *skb, struct sk_buff_head *list,
const u8 *addr, enum nl80211_iftype iftype,
const unsigned int extra_headroom,
bool has_80211_header)
{
struct sk_buff *frame = NULL;
u16 ethertype;
u8 *payload;
const struct ethhdr *eth;
int remaining, err;
u8 dst[ETH_ALEN], src[ETH_ALEN];
if (has_80211_header) {
err = ieee80211_data_to_8023(skb, addr, iftype);
if (err)
goto out;
/* skip the wrapping header */
eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr));
if (!eth)
goto out;
} else {
eth = (struct ethhdr *) skb->data;
}
while (skb != frame) {
u8 padding;
__be16 len = eth->h_proto;
unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len);
remaining = skb->len;
memcpy(dst, eth->h_dest, ETH_ALEN);
memcpy(src, eth->h_source, ETH_ALEN);
padding = (4 - subframe_len) & 0x3;
/* the last MSDU has no padding */
if (subframe_len > remaining)
goto purge;
skb_pull(skb, sizeof(struct ethhdr));
/* reuse skb for the last subframe */
if (remaining <= subframe_len + padding)
frame = skb;
else {
unsigned int hlen = ALIGN(extra_headroom, 4);
/*
* Allocate and reserve two bytes more for payload
* alignment since sizeof(struct ethhdr) is 14.
*/
frame = dev_alloc_skb(hlen + subframe_len + 2);
if (!frame)
goto purge;
skb_reserve(frame, hlen + sizeof(struct ethhdr) + 2);
memcpy(skb_put(frame, ntohs(len)), skb->data,
ntohs(len));
eth = (struct ethhdr *)skb_pull(skb, ntohs(len) +
padding);
if (!eth) {
dev_kfree_skb(frame);
goto purge;
}
}
skb_reset_network_header(frame);
frame->dev = skb->dev;
frame->priority = skb->priority;
payload = frame->data;
ethertype = (payload[6] << 8) | payload[7];
if (likely((ether_addr_equal(payload, rfc1042_header) &&
ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
ether_addr_equal(payload, bridge_tunnel_header))) {
/* remove RFC1042 or Bridge-Tunnel
* encapsulation and replace EtherType */
skb_pull(frame, 6);
memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
} else {
memcpy(skb_push(frame, sizeof(__be16)), &len,
sizeof(__be16));
memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
}
__skb_queue_tail(list, frame);
}
return;
purge:
__skb_queue_purge(list);
out:
dev_kfree_skb(skb);
}
EXPORT_SYMBOL(ieee80211_amsdu_to_8023s);
/* Given a data frame determine the 802.1p/1d tag to use. */
unsigned int cfg80211_classify8021d(struct sk_buff *skb,
struct cfg80211_qos_map *qos_map)
{
unsigned int dscp;
unsigned char vlan_priority;
/* skb->priority values from 256->263 are magic values to
* directly indicate a specific 802.1d priority. This is used
* to allow 802.1d priority to be passed directly in from VLAN
* tags, etc.
*/
if (skb->priority >= 256 && skb->priority <= 263)
return skb->priority - 256;
if (skb_vlan_tag_present(skb)) {
vlan_priority = (skb_vlan_tag_get(skb) & VLAN_PRIO_MASK)
>> VLAN_PRIO_SHIFT;
if (vlan_priority > 0)
return vlan_priority;
}
switch (skb->protocol) {
case htons(ETH_P_IP):
dscp = ipv4_get_dsfield(ip_hdr(skb)) & 0xfc;
break;
case htons(ETH_P_IPV6):
dscp = ipv6_get_dsfield(ipv6_hdr(skb)) & 0xfc;
break;
case htons(ETH_P_MPLS_UC):
case htons(ETH_P_MPLS_MC): {
struct mpls_label mpls_tmp, *mpls;
mpls = skb_header_pointer(skb, sizeof(struct ethhdr),
sizeof(*mpls), &mpls_tmp);
if (!mpls)
return 0;
return (ntohl(mpls->entry) & MPLS_LS_TC_MASK)
>> MPLS_LS_TC_SHIFT;
}
case htons(ETH_P_80221):
/* 802.21 is always network control traffic */
return 7;
default:
return 0;
}
if (qos_map) {
unsigned int i, tmp_dscp = dscp >> 2;
for (i = 0; i < qos_map->num_des; i++) {
if (tmp_dscp == qos_map->dscp_exception[i].dscp)
return qos_map->dscp_exception[i].up;
}
for (i = 0; i < 8; i++) {
if (tmp_dscp >= qos_map->up[i].low &&
tmp_dscp <= qos_map->up[i].high)
return i;
}
}
return dscp >> 5;
}
EXPORT_SYMBOL(cfg80211_classify8021d);
const u8 *ieee80211_bss_get_ie(struct cfg80211_bss *bss, u8 ie)
{
const struct cfg80211_bss_ies *ies;
ies = rcu_dereference(bss->ies);
if (!ies)
return NULL;
return cfg80211_find_ie(ie, ies->data, ies->len);
}
EXPORT_SYMBOL(ieee80211_bss_get_ie);
void cfg80211_upload_connect_keys(struct wireless_dev *wdev)
{
struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
struct net_device *dev = wdev->netdev;
int i;
if (!wdev->connect_keys)
return;
for (i = 0; i < 6; i++) {
if (!wdev->connect_keys->params[i].cipher)
continue;
if (rdev_add_key(rdev, dev, i, false, NULL,
&wdev->connect_keys->params[i])) {
netdev_err(dev, "failed to set key %d\n", i);
continue;
}
if (wdev->connect_keys->def == i)
if (rdev_set_default_key(rdev, dev, i, true, true)) {
netdev_err(dev, "failed to set defkey %d\n", i);
continue;
}
if (wdev->connect_keys->defmgmt == i)
if (rdev_set_default_mgmt_key(rdev, dev, i))
netdev_err(dev, "failed to set mgtdef %d\n", i);
}
kzfree(wdev->connect_keys);
wdev->connect_keys = NULL;
}
void cfg80211_process_wdev_events(struct wireless_dev *wdev)
{
struct cfg80211_event *ev;
unsigned long flags;
const u8 *bssid = NULL;
spin_lock_irqsave(&wdev->event_lock, flags);
while (!list_empty(&wdev->event_list)) {
ev = list_first_entry(&wdev->event_list,
struct cfg80211_event, list);
list_del(&ev->list);
spin_unlock_irqrestore(&wdev->event_lock, flags);
wdev_lock(wdev);
switch (ev->type) {
case EVENT_CONNECT_RESULT:
if (!is_zero_ether_addr(ev->cr.bssid))
bssid = ev->cr.bssid;
__cfg80211_connect_result(
wdev->netdev, bssid,
ev->cr.req_ie, ev->cr.req_ie_len,
ev->cr.resp_ie, ev->cr.resp_ie_len,
ev->cr.status,
ev->cr.status == WLAN_STATUS_SUCCESS,
NULL);
break;
case EVENT_ROAMED:
__cfg80211_roamed(wdev, ev->rm.bss, ev->rm.req_ie,
ev->rm.req_ie_len, ev->rm.resp_ie,
ev->rm.resp_ie_len);
break;
case EVENT_DISCONNECTED:
__cfg80211_disconnected(wdev->netdev,
ev->dc.ie, ev->dc.ie_len,
ev->dc.reason,
!ev->dc.locally_generated);
break;
case EVENT_IBSS_JOINED:
__cfg80211_ibss_joined(wdev->netdev, ev->ij.bssid,
ev->ij.channel);
break;
case EVENT_STOPPED:
__cfg80211_leave(wiphy_to_rdev(wdev->wiphy), wdev);
break;
}
wdev_unlock(wdev);
kfree(ev);
spin_lock_irqsave(&wdev->event_lock, flags);
}
spin_unlock_irqrestore(&wdev->event_lock, flags);
}
void cfg80211_process_rdev_events(struct cfg80211_registered_device *rdev)
{
struct wireless_dev *wdev;
ASSERT_RTNL();
list_for_each_entry(wdev, &rdev->wdev_list, list)
cfg80211_process_wdev_events(wdev);
}
int cfg80211_change_iface(struct cfg80211_registered_device *rdev,
struct net_device *dev, enum nl80211_iftype ntype,
u32 *flags, struct vif_params *params)
{
int err;
enum nl80211_iftype otype = dev->ieee80211_ptr->iftype;
ASSERT_RTNL();
/* don't support changing VLANs, you just re-create them */
if (otype == NL80211_IFTYPE_AP_VLAN)
return -EOPNOTSUPP;
/* cannot change into P2P device type */
if (ntype == NL80211_IFTYPE_P2P_DEVICE)
return -EOPNOTSUPP;
if (!rdev->ops->change_virtual_intf ||
!(rdev->wiphy.interface_modes & (1 << ntype)))
return -EOPNOTSUPP;
/* if it's part of a bridge, reject changing type to station/ibss */
if ((dev->priv_flags & IFF_BRIDGE_PORT) &&
(ntype == NL80211_IFTYPE_ADHOC ||
ntype == NL80211_IFTYPE_STATION ||
ntype == NL80211_IFTYPE_P2P_CLIENT))
return -EBUSY;
if (ntype != otype && netif_running(dev)) {
dev->ieee80211_ptr->use_4addr = false;
dev->ieee80211_ptr->mesh_id_up_len = 0;
wdev_lock(dev->ieee80211_ptr);
rdev_set_qos_map(rdev, dev, NULL);
wdev_unlock(dev->ieee80211_ptr);
switch (otype) {
case NL80211_IFTYPE_AP:
cfg80211_stop_ap(rdev, dev, true);
break;
case NL80211_IFTYPE_ADHOC:
cfg80211_leave_ibss(rdev, dev, false);
break;
case NL80211_IFTYPE_STATION:
case NL80211_IFTYPE_P2P_CLIENT:
wdev_lock(dev->ieee80211_ptr);
cfg80211_disconnect(rdev, dev,
WLAN_REASON_DEAUTH_LEAVING, true);
wdev_unlock(dev->ieee80211_ptr);
break;
case NL80211_IFTYPE_MESH_POINT:
/* mesh should be handled? */
break;
default:
break;
}
cfg80211_process_rdev_events(rdev);
}
err = rdev_change_virtual_intf(rdev, dev, ntype, flags, params);
WARN_ON(!err && dev->ieee80211_ptr->iftype != ntype);
if (!err && params && params->use_4addr != -1)
dev->ieee80211_ptr->use_4addr = params->use_4addr;
if (!err) {
dev->priv_flags &= ~IFF_DONT_BRIDGE;
switch (ntype) {
case NL80211_IFTYPE_STATION:
if (dev->ieee80211_ptr->use_4addr)
break;
/* fall through */
case NL80211_IFTYPE_OCB:
case NL80211_IFTYPE_P2P_CLIENT:
case NL80211_IFTYPE_ADHOC:
dev->priv_flags |= IFF_DONT_BRIDGE;
break;
case NL80211_IFTYPE_P2P_GO:
case NL80211_IFTYPE_AP:
case NL80211_IFTYPE_AP_VLAN:
case NL80211_IFTYPE_WDS:
case NL80211_IFTYPE_MESH_POINT:
/* bridging OK */
break;
case NL80211_IFTYPE_MONITOR:
/* monitor can't bridge anyway */
break;
case NL80211_IFTYPE_UNSPECIFIED:
case NUM_NL80211_IFTYPES:
/* not happening */
break;
case NL80211_IFTYPE_P2P_DEVICE:
WARN_ON(1);
break;
}
}
if (!err && ntype != otype && netif_running(dev)) {
cfg80211_update_iface_num(rdev, ntype, 1);
cfg80211_update_iface_num(rdev, otype, -1);
}
return err;
}
static u32 cfg80211_calculate_bitrate_60g(struct rate_info *rate)
{
static const u32 __mcs2bitrate[] = {
/* control PHY */
[0] = 275,
/* SC PHY */
[1] = 3850,
[2] = 7700,
[3] = 9625,
[4] = 11550,
[5] = 12512, /* 1251.25 mbps */
[6] = 15400,
[7] = 19250,
[8] = 23100,
[9] = 25025,
[10] = 30800,
[11] = 38500,
[12] = 46200,
/* OFDM PHY */
[13] = 6930,
[14] = 8662, /* 866.25 mbps */
[15] = 13860,
[16] = 17325,
[17] = 20790,
[18] = 27720,
[19] = 34650,
[20] = 41580,
[21] = 45045,
[22] = 51975,
[23] = 62370,
[24] = 67568, /* 6756.75 mbps */
/* LP-SC PHY */
[25] = 6260,
[26] = 8340,
[27] = 11120,
[28] = 12510,
[29] = 16680,
[30] = 22240,
[31] = 25030,
};
if (WARN_ON_ONCE(rate->mcs >= ARRAY_SIZE(__mcs2bitrate)))
return 0;
return __mcs2bitrate[rate->mcs];
}
static u32 cfg80211_calculate_bitrate_vht(struct rate_info *rate)
{
static const u32 base[4][10] = {
{ 6500000,
13000000,
19500000,
26000000,
39000000,
52000000,
58500000,
65000000,
78000000,
0,
},
{ 13500000,
27000000,
40500000,
54000000,
81000000,
108000000,
121500000,
135000000,
162000000,
180000000,
},
{ 29300000,
58500000,
87800000,
117000000,
175500000,
234000000,
263300000,
292500000,
351000000,
390000000,
},
{ 58500000,
117000000,
175500000,
234000000,
351000000,
468000000,
526500000,
585000000,
702000000,
780000000,
},
};
u32 bitrate;
int idx;
if (WARN_ON_ONCE(rate->mcs > 9))
return 0;
switch (rate->bw) {
case RATE_INFO_BW_160:
idx = 3;
break;
case RATE_INFO_BW_80:
idx = 2;
break;
case RATE_INFO_BW_40:
idx = 1;
break;
case RATE_INFO_BW_5:
case RATE_INFO_BW_10:
default:
WARN_ON(1);
/* fall through */
case RATE_INFO_BW_20:
idx = 0;
}
bitrate = base[idx][rate->mcs];
bitrate *= rate->nss;
if (rate->flags & RATE_INFO_FLAGS_SHORT_GI)
bitrate = (bitrate / 9) * 10;
/* do NOT round down here */
return (bitrate + 50000) / 100000;
}
u32 cfg80211_calculate_bitrate(struct rate_info *rate)
{
int modulation, streams, bitrate;
if (!(rate->flags & RATE_INFO_FLAGS_MCS) &&
!(rate->flags & RATE_INFO_FLAGS_VHT_MCS))
return rate->legacy;
if (rate->flags & RATE_INFO_FLAGS_60G)
return cfg80211_calculate_bitrate_60g(rate);
if (rate->flags & RATE_INFO_FLAGS_VHT_MCS)
return cfg80211_calculate_bitrate_vht(rate);
/* the formula below does only work for MCS values smaller than 32 */
if (WARN_ON_ONCE(rate->mcs >= 32))
return 0;
modulation = rate->mcs & 7;
streams = (rate->mcs >> 3) + 1;
bitrate = (rate->bw == RATE_INFO_BW_40) ? 13500000 : 6500000;
if (modulation < 4)
bitrate *= (modulation + 1);
else if (modulation == 4)
bitrate *= (modulation + 2);
else
bitrate *= (modulation + 3);
bitrate *= streams;
if (rate->flags & RATE_INFO_FLAGS_SHORT_GI)
bitrate = (bitrate / 9) * 10;
/* do NOT round down here */
return (bitrate + 50000) / 100000;
}
EXPORT_SYMBOL(cfg80211_calculate_bitrate);
int cfg80211_get_p2p_attr(const u8 *ies, unsigned int len,
enum ieee80211_p2p_attr_id attr,
u8 *buf, unsigned int bufsize)
{
u8 *out = buf;
u16 attr_remaining = 0;
bool desired_attr = false;
u16 desired_len = 0;
while (len > 0) {
unsigned int iedatalen;
unsigned int copy;
const u8 *iedata;
if (len < 2)
return -EILSEQ;
iedatalen = ies[1];
if (iedatalen + 2 > len)
return -EILSEQ;
if (ies[0] != WLAN_EID_VENDOR_SPECIFIC)
goto cont;
if (iedatalen < 4)
goto cont;
iedata = ies + 2;
/* check WFA OUI, P2P subtype */
if (iedata[0] != 0x50 || iedata[1] != 0x6f ||
iedata[2] != 0x9a || iedata[3] != 0x09)
goto cont;
iedatalen -= 4;
iedata += 4;
/* check attribute continuation into this IE */
copy = min_t(unsigned int, attr_remaining, iedatalen);
if (copy && desired_attr) {
desired_len += copy;
if (out) {
memcpy(out, iedata, min(bufsize, copy));
out += min(bufsize, copy);
bufsize -= min(bufsize, copy);
}
if (copy == attr_remaining)
return desired_len;
}
attr_remaining -= copy;
if (attr_remaining)
goto cont;
iedatalen -= copy;
iedata += copy;
while (iedatalen > 0) {
u16 attr_len;
/* P2P attribute ID & size must fit */
if (iedatalen < 3)
return -EILSEQ;
desired_attr = iedata[0] == attr;
attr_len = get_unaligned_le16(iedata + 1);
iedatalen -= 3;
iedata += 3;
copy = min_t(unsigned int, attr_len, iedatalen);
if (desired_attr) {
desired_len += copy;
if (out) {
memcpy(out, iedata, min(bufsize, copy));
out += min(bufsize, copy);
bufsize -= min(bufsize, copy);
}
if (copy == attr_len)
return desired_len;
}
iedata += copy;
iedatalen -= copy;
attr_remaining = attr_len - copy;
}
cont:
len -= ies[1] + 2;
ies += ies[1] + 2;
}
if (attr_remaining && desired_attr)
return -EILSEQ;
return -ENOENT;
}
EXPORT_SYMBOL(cfg80211_get_p2p_attr);
static bool ieee80211_id_in_list(const u8 *ids, int n_ids, u8 id)
{
int i;
for (i = 0; i < n_ids; i++)
if (ids[i] == id)
return true;
return false;
}
size_t ieee80211_ie_split_ric(const u8 *ies, size_t ielen,
const u8 *ids, int n_ids,
const u8 *after_ric, int n_after_ric,
size_t offset)
{
size_t pos = offset;
while (pos < ielen && ieee80211_id_in_list(ids, n_ids, ies[pos])) {
if (ies[pos] == WLAN_EID_RIC_DATA && n_after_ric) {
pos += 2 + ies[pos + 1];
while (pos < ielen &&
!ieee80211_id_in_list(after_ric, n_after_ric,
ies[pos]))
pos += 2 + ies[pos + 1];
} else {
pos += 2 + ies[pos + 1];
}
}
return pos;
}
EXPORT_SYMBOL(ieee80211_ie_split_ric);
size_t ieee80211_ie_split(const u8 *ies, size_t ielen,
const u8 *ids, int n_ids, size_t offset)
{
return ieee80211_ie_split_ric(ies, ielen, ids, n_ids, NULL, 0, offset);
}
EXPORT_SYMBOL(ieee80211_ie_split);
bool ieee80211_operating_class_to_band(u8 operating_class,
enum ieee80211_band *band)
{
switch (operating_class) {
case 112:
case 115 ... 127:
case 128 ... 130:
*band = IEEE80211_BAND_5GHZ;
return true;
case 81:
case 82:
case 83:
case 84:
*band = IEEE80211_BAND_2GHZ;
return true;
case 180:
*band = IEEE80211_BAND_60GHZ;
return true;
}
return false;
}
EXPORT_SYMBOL(ieee80211_operating_class_to_band);
bool ieee80211_chandef_to_operating_class(struct cfg80211_chan_def *chandef,
u8 *op_class)
{
u8 vht_opclass;
u16 freq = chandef->center_freq1;
if (freq >= 2412 && freq <= 2472) {
if (chandef->width > NL80211_CHAN_WIDTH_40)
return false;
/* 2.407 GHz, channels 1..13 */
if (chandef->width == NL80211_CHAN_WIDTH_40) {
if (freq > chandef->chan->center_freq)
*op_class = 83; /* HT40+ */
else
*op_class = 84; /* HT40- */
} else {
*op_class = 81;
}
return true;
}
if (freq == 2484) {
if (chandef->width > NL80211_CHAN_WIDTH_40)
return false;
*op_class = 82; /* channel 14 */
return true;
}
switch (chandef->width) {
case NL80211_CHAN_WIDTH_80:
vht_opclass = 128;
break;
case NL80211_CHAN_WIDTH_160:
vht_opclass = 129;
break;
case NL80211_CHAN_WIDTH_80P80:
vht_opclass = 130;
break;
case NL80211_CHAN_WIDTH_10:
case NL80211_CHAN_WIDTH_5:
return false; /* unsupported for now */
default:
vht_opclass = 0;
break;
}
/* 5 GHz, channels 36..48 */
if (freq >= 5180 && freq <= 5240) {
if (vht_opclass) {
*op_class = vht_opclass;
} else if (chandef->width == NL80211_CHAN_WIDTH_40) {
if (freq > chandef->chan->center_freq)
*op_class = 116;
else
*op_class = 117;
} else {
*op_class = 115;
}
return true;
}
/* 5 GHz, channels 52..64 */
if (freq >= 5260 && freq <= 5320) {
if (vht_opclass) {
*op_class = vht_opclass;
} else if (chandef->width == NL80211_CHAN_WIDTH_40) {
if (freq > chandef->chan->center_freq)
*op_class = 119;
else
*op_class = 120;
} else {
*op_class = 118;
}
return true;
}
/* 5 GHz, channels 100..144 */
if (freq >= 5500 && freq <= 5720) {
if (vht_opclass) {
*op_class = vht_opclass;
} else if (chandef->width == NL80211_CHAN_WIDTH_40) {
if (freq > chandef->chan->center_freq)
*op_class = 122;
else
*op_class = 123;
} else {
*op_class = 121;
}
return true;
}
/* 5 GHz, channels 149..169 */
if (freq >= 5745 && freq <= 5845) {
if (vht_opclass) {
*op_class = vht_opclass;
} else if (chandef->width == NL80211_CHAN_WIDTH_40) {
if (freq > chandef->chan->center_freq)
*op_class = 126;
else
*op_class = 127;
} else if (freq <= 5805) {
*op_class = 124;
} else {
*op_class = 125;
}
return true;
}
/* 56.16 GHz, channel 1..4 */
if (freq >= 56160 + 2160 * 1 && freq <= 56160 + 2160 * 4) {
if (chandef->width >= NL80211_CHAN_WIDTH_40)
return false;
*op_class = 180;
return true;
}
/* not supported yet */
return false;
}
EXPORT_SYMBOL(ieee80211_chandef_to_operating_class);
int cfg80211_validate_beacon_int(struct cfg80211_registered_device *rdev,
u32 beacon_int)
{
struct wireless_dev *wdev;
int res = 0;
if (!beacon_int)
return -EINVAL;
list_for_each_entry(wdev, &rdev->wdev_list, list) {
if (!wdev->beacon_interval)
continue;
if (wdev->beacon_interval != beacon_int) {
res = -EINVAL;
break;
}
}
return res;
}
int cfg80211_iter_combinations(struct wiphy *wiphy,
const int num_different_channels,
const u8 radar_detect,
const int iftype_num[NUM_NL80211_IFTYPES],
void (*iter)(const struct ieee80211_iface_combination *c,
void *data),
void *data)
{
const struct ieee80211_regdomain *regdom;
enum nl80211_dfs_regions region = 0;
int i, j, iftype;
int num_interfaces = 0;
u32 used_iftypes = 0;
if (radar_detect) {
rcu_read_lock();
regdom = rcu_dereference(cfg80211_regdomain);
if (regdom)
region = regdom->dfs_region;
rcu_read_unlock();
}
for (iftype = 0; iftype < NUM_NL80211_IFTYPES; iftype++) {
num_interfaces += iftype_num[iftype];
if (iftype_num[iftype] > 0 &&
!(wiphy->software_iftypes & BIT(iftype)))
used_iftypes |= BIT(iftype);
}
for (i = 0; i < wiphy->n_iface_combinations; i++) {
const struct ieee80211_iface_combination *c;
struct ieee80211_iface_limit *limits;
u32 all_iftypes = 0;
c = &wiphy->iface_combinations[i];
if (num_interfaces > c->max_interfaces)
continue;
if (num_different_channels > c->num_different_channels)
continue;
limits = kmemdup(c->limits, sizeof(limits[0]) * c->n_limits,
GFP_KERNEL);
if (!limits)
return -ENOMEM;
for (iftype = 0; iftype < NUM_NL80211_IFTYPES; iftype++) {
if (wiphy->software_iftypes & BIT(iftype))
continue;
for (j = 0; j < c->n_limits; j++) {
all_iftypes |= limits[j].types;
if (!(limits[j].types & BIT(iftype)))
continue;
if (limits[j].max < iftype_num[iftype])
goto cont;
limits[j].max -= iftype_num[iftype];
}
}
if (radar_detect != (c->radar_detect_widths & radar_detect))
goto cont;
if (radar_detect && c->radar_detect_regions &&
!(c->radar_detect_regions & BIT(region)))
goto cont;
/* Finally check that all iftypes that we're currently
* using are actually part of this combination. If they
* aren't then we can't use this combination and have
* to continue to the next.
*/
if ((all_iftypes & used_iftypes) != used_iftypes)
goto cont;
/* This combination covered all interface types and
* supported the requested numbers, so we're good.
*/
(*iter)(c, data);
cont:
kfree(limits);
}
return 0;
}
EXPORT_SYMBOL(cfg80211_iter_combinations);
static void
cfg80211_iter_sum_ifcombs(const struct ieee80211_iface_combination *c,
void *data)
{
int *num = data;
(*num)++;
}
int cfg80211_check_combinations(struct wiphy *wiphy,
const int num_different_channels,
const u8 radar_detect,
const int iftype_num[NUM_NL80211_IFTYPES])
{
int err, num = 0;
err = cfg80211_iter_combinations(wiphy, num_different_channels,
radar_detect, iftype_num,
cfg80211_iter_sum_ifcombs, &num);
if (err)
return err;
if (num == 0)
return -EBUSY;
return 0;
}
EXPORT_SYMBOL(cfg80211_check_combinations);
int cfg80211_can_use_iftype_chan(struct cfg80211_registered_device *rdev,
struct wireless_dev *wdev,
enum nl80211_iftype iftype,
struct ieee80211_channel *chan,
enum cfg80211_chan_mode chanmode,
u8 radar_detect)
{
struct wireless_dev *wdev_iter;
int num[NUM_NL80211_IFTYPES];
struct ieee80211_channel
*used_channels[CFG80211_MAX_NUM_DIFFERENT_CHANNELS];
struct ieee80211_channel *ch;
enum cfg80211_chan_mode chmode;
int num_different_channels = 0;
int total = 1;
int i;
ASSERT_RTNL();
if (WARN_ON(hweight32(radar_detect) > 1))
return -EINVAL;
if (WARN_ON(iftype >= NUM_NL80211_IFTYPES))
return -EINVAL;
/* Always allow software iftypes */
if (rdev->wiphy.software_iftypes & BIT(iftype)) {
if (radar_detect)
return -EINVAL;
return 0;
}
memset(num, 0, sizeof(num));
memset(used_channels, 0, sizeof(used_channels));
num[iftype] = 1;
/* TODO: We'll probably not need this anymore, since this
* should only be called with CHAN_MODE_UNDEFINED. There are
* still a couple of pending calls where other chanmodes are
* used, but we should get rid of them.
*/
switch (chanmode) {
case CHAN_MODE_UNDEFINED:
break;
case CHAN_MODE_SHARED:
WARN_ON(!chan);
used_channels[0] = chan;
num_different_channels++;
break;
case CHAN_MODE_EXCLUSIVE:
num_different_channels++;
break;
}
list_for_each_entry(wdev_iter, &rdev->wdev_list, list) {
if (wdev_iter == wdev)
continue;
if (wdev_iter->iftype == NL80211_IFTYPE_P2P_DEVICE) {
if (!wdev_iter->p2p_started)
continue;
} else if (wdev_iter->netdev) {
if (!netif_running(wdev_iter->netdev))
continue;
} else {
WARN_ON(1);
}
if (rdev->wiphy.software_iftypes & BIT(wdev_iter->iftype))
continue;
/*
* We may be holding the "wdev" mutex, but now need to lock
* wdev_iter. This is OK because once we get here wdev_iter
* is not wdev (tested above), but we need to use the nested
* locking for lockdep.
*/
mutex_lock_nested(&wdev_iter->mtx, 1);
__acquire(wdev_iter->mtx);
cfg80211_get_chan_state(wdev_iter, &ch, &chmode, &radar_detect);
wdev_unlock(wdev_iter);
switch (chmode) {
case CHAN_MODE_UNDEFINED:
break;
case CHAN_MODE_SHARED:
for (i = 0; i < CFG80211_MAX_NUM_DIFFERENT_CHANNELS; i++)
if (!used_channels[i] || used_channels[i] == ch)
break;
if (i == CFG80211_MAX_NUM_DIFFERENT_CHANNELS)
return -EBUSY;
if (used_channels[i] == NULL) {
used_channels[i] = ch;
num_different_channels++;
}
break;
case CHAN_MODE_EXCLUSIVE:
num_different_channels++;
break;
}
num[wdev_iter->iftype]++;
total++;
}
if (total == 1 && !radar_detect)
return 0;
return cfg80211_check_combinations(&rdev->wiphy, num_different_channels,
radar_detect, num);
}
int ieee80211_get_ratemask(struct ieee80211_supported_band *sband,
const u8 *rates, unsigned int n_rates,
u32 *mask)
{
int i, j;
if (!sband)
return -EINVAL;
if (n_rates == 0 || n_rates > NL80211_MAX_SUPP_RATES)
return -EINVAL;
*mask = 0;
for (i = 0; i < n_rates; i++) {
int rate = (rates[i] & 0x7f) * 5;
bool found = false;
for (j = 0; j < sband->n_bitrates; j++) {
if (sband->bitrates[j].bitrate == rate) {
found = true;
*mask |= BIT(j);
break;
}
}
if (!found)
return -EINVAL;
}
/*
* mask must have at least one bit set here since we
* didn't accept a 0-length rates array nor allowed
* entries in the array that didn't exist
*/
return 0;
}
unsigned int ieee80211_get_num_supported_channels(struct wiphy *wiphy)
{
enum ieee80211_band band;
unsigned int n_channels = 0;
for (band = 0; band < IEEE80211_NUM_BANDS; band++)
if (wiphy->bands[band])
n_channels += wiphy->bands[band]->n_channels;
return n_channels;
}
EXPORT_SYMBOL(ieee80211_get_num_supported_channels);
int cfg80211_get_station(struct net_device *dev, const u8 *mac_addr,
struct station_info *sinfo)
{
struct cfg80211_registered_device *rdev;
struct wireless_dev *wdev;
wdev = dev->ieee80211_ptr;
if (!wdev)
return -EOPNOTSUPP;
rdev = wiphy_to_rdev(wdev->wiphy);
if (!rdev->ops->get_station)
return -EOPNOTSUPP;
return rdev_get_station(rdev, dev, mac_addr, sinfo);
}
EXPORT_SYMBOL(cfg80211_get_station);
/* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
/* Ethernet-II snap header (RFC1042 for most EtherTypes) */
const unsigned char rfc1042_header[] __aligned(2) =
{ 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
EXPORT_SYMBOL(rfc1042_header);
/* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
const unsigned char bridge_tunnel_header[] __aligned(2) =
{ 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
EXPORT_SYMBOL(bridge_tunnel_header);
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