685 строки
17 KiB
C
685 строки
17 KiB
C
/*
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* Wireless utility functions
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*
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* Copyright 2007-2009 Johannes Berg <johannes@sipsolutions.net>
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*/
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#include <linux/bitops.h>
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#include <linux/etherdevice.h>
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#include <net/cfg80211.h>
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#include <net/ip.h>
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#include "core.h"
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struct ieee80211_rate *
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ieee80211_get_response_rate(struct ieee80211_supported_band *sband,
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u32 basic_rates, int bitrate)
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{
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struct ieee80211_rate *result = &sband->bitrates[0];
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int i;
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for (i = 0; i < sband->n_bitrates; i++) {
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if (!(basic_rates & BIT(i)))
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continue;
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if (sband->bitrates[i].bitrate > bitrate)
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continue;
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result = &sband->bitrates[i];
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}
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return result;
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}
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EXPORT_SYMBOL(ieee80211_get_response_rate);
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int ieee80211_channel_to_frequency(int chan)
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{
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if (chan < 14)
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return 2407 + chan * 5;
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if (chan == 14)
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return 2484;
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/* FIXME: 802.11j 17.3.8.3.2 */
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return (chan + 1000) * 5;
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}
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EXPORT_SYMBOL(ieee80211_channel_to_frequency);
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int ieee80211_frequency_to_channel(int freq)
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{
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if (freq == 2484)
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return 14;
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if (freq < 2484)
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return (freq - 2407) / 5;
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/* FIXME: 802.11j 17.3.8.3.2 */
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return freq/5 - 1000;
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}
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EXPORT_SYMBOL(ieee80211_frequency_to_channel);
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struct ieee80211_channel *__ieee80211_get_channel(struct wiphy *wiphy,
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int freq)
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{
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enum ieee80211_band band;
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struct ieee80211_supported_band *sband;
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int i;
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for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
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sband = wiphy->bands[band];
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if (!sband)
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continue;
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for (i = 0; i < sband->n_channels; i++) {
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if (sband->channels[i].center_freq == freq)
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return &sband->channels[i];
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}
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}
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return NULL;
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}
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EXPORT_SYMBOL(__ieee80211_get_channel);
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static void set_mandatory_flags_band(struct ieee80211_supported_band *sband,
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enum ieee80211_band band)
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{
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int i, want;
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switch (band) {
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case IEEE80211_BAND_5GHZ:
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want = 3;
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for (i = 0; i < sband->n_bitrates; i++) {
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if (sband->bitrates[i].bitrate == 60 ||
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sband->bitrates[i].bitrate == 120 ||
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sband->bitrates[i].bitrate == 240) {
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sband->bitrates[i].flags |=
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IEEE80211_RATE_MANDATORY_A;
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want--;
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}
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}
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WARN_ON(want);
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break;
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case IEEE80211_BAND_2GHZ:
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want = 7;
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for (i = 0; i < sband->n_bitrates; i++) {
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if (sband->bitrates[i].bitrate == 10) {
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sband->bitrates[i].flags |=
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IEEE80211_RATE_MANDATORY_B |
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IEEE80211_RATE_MANDATORY_G;
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want--;
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}
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if (sband->bitrates[i].bitrate == 20 ||
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sband->bitrates[i].bitrate == 55 ||
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sband->bitrates[i].bitrate == 110 ||
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sband->bitrates[i].bitrate == 60 ||
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sband->bitrates[i].bitrate == 120 ||
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sband->bitrates[i].bitrate == 240) {
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sband->bitrates[i].flags |=
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IEEE80211_RATE_MANDATORY_G;
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want--;
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}
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if (sband->bitrates[i].bitrate != 10 &&
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sband->bitrates[i].bitrate != 20 &&
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sband->bitrates[i].bitrate != 55 &&
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sband->bitrates[i].bitrate != 110)
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sband->bitrates[i].flags |=
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IEEE80211_RATE_ERP_G;
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}
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WARN_ON(want != 0 && want != 3 && want != 6);
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break;
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case IEEE80211_NUM_BANDS:
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WARN_ON(1);
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break;
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}
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}
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void ieee80211_set_bitrate_flags(struct wiphy *wiphy)
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{
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enum ieee80211_band band;
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for (band = 0; band < IEEE80211_NUM_BANDS; band++)
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if (wiphy->bands[band])
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set_mandatory_flags_band(wiphy->bands[band], band);
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}
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int cfg80211_validate_key_settings(struct cfg80211_registered_device *rdev,
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struct key_params *params, int key_idx,
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const u8 *mac_addr)
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{
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int i;
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if (key_idx > 5)
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return -EINVAL;
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/*
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* Disallow pairwise keys with non-zero index unless it's WEP
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* (because current deployments use pairwise WEP keys with
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* non-zero indizes but 802.11i clearly specifies to use zero)
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*/
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if (mac_addr && key_idx &&
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params->cipher != WLAN_CIPHER_SUITE_WEP40 &&
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params->cipher != WLAN_CIPHER_SUITE_WEP104)
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return -EINVAL;
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switch (params->cipher) {
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case WLAN_CIPHER_SUITE_WEP40:
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if (params->key_len != WLAN_KEY_LEN_WEP40)
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return -EINVAL;
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break;
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case WLAN_CIPHER_SUITE_TKIP:
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if (params->key_len != WLAN_KEY_LEN_TKIP)
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return -EINVAL;
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break;
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case WLAN_CIPHER_SUITE_CCMP:
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if (params->key_len != WLAN_KEY_LEN_CCMP)
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return -EINVAL;
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break;
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case WLAN_CIPHER_SUITE_WEP104:
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if (params->key_len != WLAN_KEY_LEN_WEP104)
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return -EINVAL;
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break;
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case WLAN_CIPHER_SUITE_AES_CMAC:
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if (params->key_len != WLAN_KEY_LEN_AES_CMAC)
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return -EINVAL;
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break;
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default:
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return -EINVAL;
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}
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if (params->seq) {
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switch (params->cipher) {
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case WLAN_CIPHER_SUITE_WEP40:
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case WLAN_CIPHER_SUITE_WEP104:
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/* These ciphers do not use key sequence */
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return -EINVAL;
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case WLAN_CIPHER_SUITE_TKIP:
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case WLAN_CIPHER_SUITE_CCMP:
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case WLAN_CIPHER_SUITE_AES_CMAC:
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if (params->seq_len != 6)
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return -EINVAL;
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break;
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}
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}
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for (i = 0; i < rdev->wiphy.n_cipher_suites; i++)
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if (params->cipher == rdev->wiphy.cipher_suites[i])
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break;
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if (i == rdev->wiphy.n_cipher_suites)
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return -EINVAL;
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return 0;
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}
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/* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
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/* Ethernet-II snap header (RFC1042 for most EtherTypes) */
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const unsigned char rfc1042_header[] __aligned(2) =
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{ 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
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EXPORT_SYMBOL(rfc1042_header);
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/* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
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const unsigned char bridge_tunnel_header[] __aligned(2) =
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{ 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
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EXPORT_SYMBOL(bridge_tunnel_header);
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unsigned int ieee80211_hdrlen(__le16 fc)
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{
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unsigned int hdrlen = 24;
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if (ieee80211_is_data(fc)) {
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if (ieee80211_has_a4(fc))
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hdrlen = 30;
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if (ieee80211_is_data_qos(fc))
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hdrlen += IEEE80211_QOS_CTL_LEN;
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goto out;
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}
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if (ieee80211_is_ctl(fc)) {
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/*
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* ACK and CTS are 10 bytes, all others 16. To see how
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* to get this condition consider
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* subtype mask: 0b0000000011110000 (0x00F0)
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* ACK subtype: 0b0000000011010000 (0x00D0)
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* CTS subtype: 0b0000000011000000 (0x00C0)
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* bits that matter: ^^^ (0x00E0)
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* value of those: 0b0000000011000000 (0x00C0)
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*/
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if ((fc & cpu_to_le16(0x00E0)) == cpu_to_le16(0x00C0))
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hdrlen = 10;
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else
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hdrlen = 16;
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}
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out:
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return hdrlen;
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}
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EXPORT_SYMBOL(ieee80211_hdrlen);
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unsigned int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb)
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{
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const struct ieee80211_hdr *hdr =
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(const struct ieee80211_hdr *)skb->data;
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unsigned int hdrlen;
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if (unlikely(skb->len < 10))
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return 0;
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hdrlen = ieee80211_hdrlen(hdr->frame_control);
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if (unlikely(hdrlen > skb->len))
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return 0;
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return hdrlen;
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}
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EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb);
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static int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr)
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{
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int ae = meshhdr->flags & MESH_FLAGS_AE;
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/* 7.1.3.5a.2 */
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switch (ae) {
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case 0:
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return 6;
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case MESH_FLAGS_AE_A4:
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return 12;
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case MESH_FLAGS_AE_A5_A6:
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return 18;
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case (MESH_FLAGS_AE_A4 | MESH_FLAGS_AE_A5_A6):
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return 24;
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default:
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return 6;
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}
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}
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int ieee80211_data_to_8023(struct sk_buff *skb, u8 *addr,
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enum nl80211_iftype iftype)
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{
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struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
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u16 hdrlen, ethertype;
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u8 *payload;
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u8 dst[ETH_ALEN];
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u8 src[ETH_ALEN] __aligned(2);
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if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
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return -1;
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hdrlen = ieee80211_hdrlen(hdr->frame_control);
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/* convert IEEE 802.11 header + possible LLC headers into Ethernet
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* header
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* IEEE 802.11 address fields:
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* ToDS FromDS Addr1 Addr2 Addr3 Addr4
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* 0 0 DA SA BSSID n/a
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* 0 1 DA BSSID SA n/a
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* 1 0 BSSID SA DA n/a
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* 1 1 RA TA DA SA
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*/
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memcpy(dst, ieee80211_get_DA(hdr), ETH_ALEN);
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memcpy(src, ieee80211_get_SA(hdr), ETH_ALEN);
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switch (hdr->frame_control &
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cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
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case cpu_to_le16(IEEE80211_FCTL_TODS):
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if (unlikely(iftype != NL80211_IFTYPE_AP &&
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iftype != NL80211_IFTYPE_AP_VLAN))
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return -1;
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break;
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case cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
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if (unlikely(iftype != NL80211_IFTYPE_WDS &&
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iftype != NL80211_IFTYPE_MESH_POINT))
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return -1;
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if (iftype == NL80211_IFTYPE_MESH_POINT) {
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struct ieee80211s_hdr *meshdr =
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(struct ieee80211s_hdr *) (skb->data + hdrlen);
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hdrlen += ieee80211_get_mesh_hdrlen(meshdr);
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if (meshdr->flags & MESH_FLAGS_AE_A5_A6) {
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memcpy(dst, meshdr->eaddr1, ETH_ALEN);
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memcpy(src, meshdr->eaddr2, ETH_ALEN);
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}
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}
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break;
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case cpu_to_le16(IEEE80211_FCTL_FROMDS):
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if ((iftype != NL80211_IFTYPE_STATION &&
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iftype != NL80211_IFTYPE_MESH_POINT) ||
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(is_multicast_ether_addr(dst) &&
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!compare_ether_addr(src, addr)))
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return -1;
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if (iftype == NL80211_IFTYPE_MESH_POINT) {
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struct ieee80211s_hdr *meshdr =
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(struct ieee80211s_hdr *) (skb->data + hdrlen);
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hdrlen += ieee80211_get_mesh_hdrlen(meshdr);
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if (meshdr->flags & MESH_FLAGS_AE_A4)
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memcpy(src, meshdr->eaddr1, ETH_ALEN);
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}
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break;
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case cpu_to_le16(0):
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if (iftype != NL80211_IFTYPE_ADHOC)
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return -1;
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break;
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}
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if (unlikely(skb->len - hdrlen < 8))
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return -1;
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payload = skb->data + hdrlen;
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ethertype = (payload[6] << 8) | payload[7];
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if (likely((compare_ether_addr(payload, rfc1042_header) == 0 &&
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ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
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compare_ether_addr(payload, bridge_tunnel_header) == 0)) {
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/* remove RFC1042 or Bridge-Tunnel encapsulation and
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* replace EtherType */
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skb_pull(skb, hdrlen + 6);
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memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
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memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
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} else {
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struct ethhdr *ehdr;
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__be16 len;
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skb_pull(skb, hdrlen);
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len = htons(skb->len);
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ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr));
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memcpy(ehdr->h_dest, dst, ETH_ALEN);
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memcpy(ehdr->h_source, src, ETH_ALEN);
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ehdr->h_proto = len;
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}
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return 0;
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}
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EXPORT_SYMBOL(ieee80211_data_to_8023);
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int ieee80211_data_from_8023(struct sk_buff *skb, u8 *addr,
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enum nl80211_iftype iftype, u8 *bssid, bool qos)
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{
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struct ieee80211_hdr hdr;
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u16 hdrlen, ethertype;
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__le16 fc;
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const u8 *encaps_data;
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int encaps_len, skip_header_bytes;
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int nh_pos, h_pos;
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int head_need;
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if (unlikely(skb->len < ETH_HLEN))
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return -EINVAL;
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nh_pos = skb_network_header(skb) - skb->data;
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h_pos = skb_transport_header(skb) - skb->data;
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/* convert Ethernet header to proper 802.11 header (based on
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* operation mode) */
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ethertype = (skb->data[12] << 8) | skb->data[13];
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fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
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switch (iftype) {
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case NL80211_IFTYPE_AP:
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case NL80211_IFTYPE_AP_VLAN:
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fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
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/* DA BSSID SA */
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memcpy(hdr.addr1, skb->data, ETH_ALEN);
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memcpy(hdr.addr2, addr, ETH_ALEN);
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memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
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hdrlen = 24;
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break;
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case NL80211_IFTYPE_STATION:
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fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
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/* BSSID SA DA */
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memcpy(hdr.addr1, bssid, ETH_ALEN);
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memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
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memcpy(hdr.addr3, skb->data, ETH_ALEN);
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hdrlen = 24;
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break;
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case NL80211_IFTYPE_ADHOC:
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/* DA SA BSSID */
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memcpy(hdr.addr1, skb->data, ETH_ALEN);
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memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
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memcpy(hdr.addr3, bssid, ETH_ALEN);
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hdrlen = 24;
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break;
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default:
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return -EOPNOTSUPP;
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}
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if (qos) {
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fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
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hdrlen += 2;
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}
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hdr.frame_control = fc;
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hdr.duration_id = 0;
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hdr.seq_ctrl = 0;
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skip_header_bytes = ETH_HLEN;
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if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
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encaps_data = bridge_tunnel_header;
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encaps_len = sizeof(bridge_tunnel_header);
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skip_header_bytes -= 2;
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} else if (ethertype > 0x600) {
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encaps_data = rfc1042_header;
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encaps_len = sizeof(rfc1042_header);
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skip_header_bytes -= 2;
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} else {
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encaps_data = NULL;
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encaps_len = 0;
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}
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skb_pull(skb, skip_header_bytes);
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nh_pos -= skip_header_bytes;
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h_pos -= skip_header_bytes;
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head_need = hdrlen + encaps_len - skb_headroom(skb);
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if (head_need > 0 || skb_cloned(skb)) {
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head_need = max(head_need, 0);
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if (head_need)
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skb_orphan(skb);
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if (pskb_expand_head(skb, head_need, 0, GFP_ATOMIC)) {
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printk(KERN_ERR "failed to reallocate Tx buffer\n");
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return -ENOMEM;
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}
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skb->truesize += head_need;
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}
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if (encaps_data) {
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memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
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nh_pos += encaps_len;
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h_pos += encaps_len;
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}
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memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
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nh_pos += hdrlen;
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h_pos += hdrlen;
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/* Update skb pointers to various headers since this modified frame
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* is going to go through Linux networking code that may potentially
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* need things like pointer to IP header. */
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skb_set_mac_header(skb, 0);
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skb_set_network_header(skb, nh_pos);
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|
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;
|
|
}
|
|
|
|
static 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.bssid,
|
|
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, true);
|
|
break;
|
|
case EVENT_IBSS_JOINED:
|
|
__cfg80211_ibss_joined(wdev->netdev, ev->ij.bssid);
|
|
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();
|
|
ASSERT_RDEV_LOCK(rdev);
|
|
|
|
mutex_lock(&rdev->devlist_mtx);
|
|
|
|
list_for_each_entry(wdev, &rdev->netdev_list, list)
|
|
cfg80211_process_wdev_events(wdev);
|
|
|
|
mutex_unlock(&rdev->devlist_mtx);
|
|
}
|
|
|
|
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_RDEV_LOCK(rdev);
|
|
|
|
/* don't support changing VLANs, you just re-create them */
|
|
if (otype == NL80211_IFTYPE_AP_VLAN)
|
|
return -EOPNOTSUPP;
|
|
|
|
if (!rdev->ops->change_virtual_intf ||
|
|
!(rdev->wiphy.interface_modes & (1 << ntype)))
|
|
return -EOPNOTSUPP;
|
|
|
|
if (ntype != otype) {
|
|
switch (otype) {
|
|
case NL80211_IFTYPE_ADHOC:
|
|
cfg80211_leave_ibss(rdev, dev, false);
|
|
break;
|
|
case NL80211_IFTYPE_STATION:
|
|
cfg80211_disconnect(rdev, dev,
|
|
WLAN_REASON_DEAUTH_LEAVING, true);
|
|
break;
|
|
case NL80211_IFTYPE_MESH_POINT:
|
|
/* mesh should be handled? */
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
cfg80211_process_rdev_events(rdev);
|
|
}
|
|
|
|
err = rdev->ops->change_virtual_intf(&rdev->wiphy, dev,
|
|
ntype, flags, params);
|
|
|
|
WARN_ON(!err && dev->ieee80211_ptr->iftype != ntype);
|
|
|
|
return err;
|
|
}
|