569 lines
14 KiB
C
569 lines
14 KiB
C
/*
|
|
* Wireless utility functions
|
|
*
|
|
* Copyright 2007-2009 Johannes Berg <johannes@sipsolutions.net>
|
|
*/
|
|
#include <linux/bitops.h>
|
|
#include <linux/etherdevice.h>
|
|
#include <net/cfg80211.h>
|
|
#include <net/ip.h>
|
|
#include "core.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);
|
|
|
|
int ieee80211_channel_to_frequency(int chan)
|
|
{
|
|
if (chan < 14)
|
|
return 2407 + chan * 5;
|
|
|
|
if (chan == 14)
|
|
return 2484;
|
|
|
|
/* FIXME: 802.11j 17.3.8.3.2 */
|
|
return (chan + 1000) * 5;
|
|
}
|
|
EXPORT_SYMBOL(ieee80211_channel_to_frequency);
|
|
|
|
int ieee80211_frequency_to_channel(int freq)
|
|
{
|
|
if (freq == 2484)
|
|
return 14;
|
|
|
|
if (freq < 2484)
|
|
return (freq - 2407) / 5;
|
|
|
|
/* FIXME: 802.11j 17.3.8.3.2 */
|
|
return freq/5 - 1000;
|
|
}
|
|
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_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);
|
|
}
|
|
|
|
int cfg80211_validate_key_settings(struct cfg80211_registered_device *rdev,
|
|
struct key_params *params, int key_idx,
|
|
const u8 *mac_addr)
|
|
{
|
|
int i;
|
|
|
|
if (key_idx > 5)
|
|
return -EINVAL;
|
|
|
|
/*
|
|
* Disallow pairwise keys with non-zero index unless it's WEP
|
|
* (because current deployments use pairwise WEP keys with
|
|
* non-zero indizes but 802.11i clearly specifies to use zero)
|
|
*/
|
|
if (mac_addr && key_idx &&
|
|
params->cipher != WLAN_CIPHER_SUITE_WEP40 &&
|
|
params->cipher != WLAN_CIPHER_SUITE_WEP104)
|
|
return -EINVAL;
|
|
|
|
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_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;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
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_AES_CMAC:
|
|
if (params->seq_len != 6)
|
|
return -EINVAL;
|
|
break;
|
|
}
|
|
}
|
|
|
|
for (i = 0; i < rdev->wiphy.n_cipher_suites; i++)
|
|
if (params->cipher == rdev->wiphy.cipher_suites[i])
|
|
break;
|
|
if (i == rdev->wiphy.n_cipher_suites)
|
|
return -EINVAL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* 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);
|
|
|
|
unsigned int 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;
|
|
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);
|
|
|
|
static int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr)
|
|
{
|
|
int ae = meshhdr->flags & MESH_FLAGS_AE;
|
|
/* 7.1.3.5a.2 */
|
|
switch (ae) {
|
|
case 0:
|
|
return 6;
|
|
case 1:
|
|
return 12;
|
|
case 2:
|
|
return 18;
|
|
case 3:
|
|
return 24;
|
|
default:
|
|
return 6;
|
|
}
|
|
}
|
|
|
|
int ieee80211_data_to_8023(struct sk_buff *skb, 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))
|
|
return -1;
|
|
break;
|
|
case cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
|
|
if (unlikely(iftype != NL80211_IFTYPE_WDS &&
|
|
iftype != NL80211_IFTYPE_MESH_POINT))
|
|
return -1;
|
|
if (iftype == NL80211_IFTYPE_MESH_POINT) {
|
|
struct ieee80211s_hdr *meshdr =
|
|
(struct ieee80211s_hdr *) (skb->data + hdrlen);
|
|
hdrlen += ieee80211_get_mesh_hdrlen(meshdr);
|
|
if (meshdr->flags & MESH_FLAGS_AE_A5_A6) {
|
|
memcpy(dst, meshdr->eaddr1, ETH_ALEN);
|
|
memcpy(src, meshdr->eaddr2, ETH_ALEN);
|
|
}
|
|
}
|
|
break;
|
|
case cpu_to_le16(IEEE80211_FCTL_FROMDS):
|
|
if (iftype != NL80211_IFTYPE_STATION ||
|
|
(is_multicast_ether_addr(dst) &&
|
|
!compare_ether_addr(src, addr)))
|
|
return -1;
|
|
break;
|
|
case cpu_to_le16(0):
|
|
if (iftype != NL80211_IFTYPE_ADHOC)
|
|
return -1;
|
|
break;
|
|
}
|
|
|
|
if (unlikely(skb->len - hdrlen < 8))
|
|
return -1;
|
|
|
|
payload = skb->data + hdrlen;
|
|
ethertype = (payload[6] << 8) | payload[7];
|
|
|
|
if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
|
|
ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
|
|
compare_ether_addr(payload, bridge_tunnel_header) == 0)) {
|
|
/* 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, u8 *addr,
|
|
enum nl80211_iftype iftype, 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:
|
|
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:
|
|
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_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 > 0x600) {
|
|
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)) {
|
|
printk(KERN_ERR "failed to reallocate Tx buffer\n");
|
|
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);
|
|
|
|
/* Given a data frame determine the 802.1p/1d tag to use. */
|
|
unsigned int cfg80211_classify8021d(struct sk_buff *skb)
|
|
{
|
|
unsigned int dscp;
|
|
|
|
/* 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;
|
|
|
|
switch (skb->protocol) {
|
|
case htons(ETH_P_IP):
|
|
dscp = ip_hdr(skb)->tos & 0xfc;
|
|
break;
|
|
default:
|
|
return 0;
|
|
}
|
|
|
|
return dscp >> 5;
|
|
}
|
|
EXPORT_SYMBOL(cfg80211_classify8021d);
|
|
|
|
const u8 *ieee80211_bss_get_ie(struct cfg80211_bss *bss, u8 ie)
|
|
{
|
|
u8 *end, *pos;
|
|
|
|
pos = bss->information_elements;
|
|
if (pos == NULL)
|
|
return NULL;
|
|
end = pos + bss->len_information_elements;
|
|
|
|
while (pos + 1 < end) {
|
|
if (pos + 2 + pos[1] > end)
|
|
break;
|
|
if (pos[0] == ie)
|
|
return pos;
|
|
pos += 2 + pos[1];
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL(ieee80211_bss_get_ie);
|
|
|
|
void cfg80211_upload_connect_keys(struct wireless_dev *wdev)
|
|
{
|
|
struct cfg80211_registered_device *rdev = wiphy_to_dev(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->ops->add_key(wdev->wiphy, dev, i, NULL,
|
|
&wdev->connect_keys->params[i])) {
|
|
printk(KERN_ERR "%s: failed to set key %d\n",
|
|
dev->name, i);
|
|
continue;
|
|
}
|
|
if (wdev->connect_keys->def == i)
|
|
if (rdev->ops->set_default_key(wdev->wiphy, dev, i)) {
|
|
printk(KERN_ERR "%s: failed to set defkey %d\n",
|
|
dev->name, i);
|
|
continue;
|
|
}
|
|
if (wdev->connect_keys->defmgmt == i)
|
|
if (rdev->ops->set_default_mgmt_key(wdev->wiphy, dev, i))
|
|
printk(KERN_ERR "%s: failed to set mgtdef %d\n",
|
|
dev->name, i);
|
|
}
|
|
|
|
kfree(wdev->connect_keys);
|
|
wdev->connect_keys = NULL;
|
|
}
|