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iwd/src/nl80211util.c

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/*
*
* Wireless daemon for Linux
*
* Copyright (C) 2018-2019 Intel Corporation. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <errno.h>
#include <linux/if_ether.h>
#include <ell/ell.h>
#include "linux/nl80211.h"
#include "src/nl80211util.h"
#include "src/band.h"
#include "src/ie.h"
#include "src/handshake.h"
#include "src/util.h"
typedef bool (*attr_handler)(const void *data, uint16_t len, void *o);
static bool extract_ifindex(const void *data, uint16_t len, void *o)
{
uint32_t *out = o;
if (len != 4)
return false;
/* ifindex cannot be 0 */
if (l_get_u32(data) == 0)
return false;
*out = l_get_u32(data);
return true;
}
static bool extract_name(const void *data, uint16_t len, void *o)
{
const char **out = o;
if (len < 1)
return false;
if (!memchr(data + 1, 0, len - 1))
return false;
*out = data;
return true;
}
static bool extract_2_chars(const void *data, uint16_t len, void *o)
{
char *out = o;
const char *in = data;
if (len != 3 || in[2] != 0)
return false;
out[0] = in[0];
out[1] = in[1];
return true;
}
static bool extract_mac(const void *data, uint16_t len, void *o)
{
const uint8_t **out = o;
if (len != 6)
return false;
*out = data;
return true;
}
static bool extract_uint64(const void *data, uint16_t len, void *o)
{
uint64_t *out = o;
if (len != 8)
return false;
*out = l_get_u64(data);
return true;
}
static bool extract_uint32(const void *data, uint16_t len, void *o)
{
uint32_t *out = o;
if (len != 4)
return false;
*out = l_get_u32(data);
return true;
}
static bool extract_flag(const void *data, uint16_t len, void *o)
{
if (len != 0)
return false;
return true;
}
static bool extract_iovec(const void *data, uint16_t len, void *o)
{
struct iovec *iov = o;
iov->iov_base = (void *) data;
iov->iov_len = len;
return true;
}
static bool extract_nested(const void *data, uint16_t len, void *o)
{
const struct l_genl_attr *outer = data;
struct l_genl_attr *nested = o;
l_genl_attr_recurse(outer, nested);
return true;
}
static bool extract_u8(const void *data, uint16_t len, void *o)
{
uint8_t *out = o;
if (len != 1)
return false;
*out = l_get_u8(data);
return true;
}
static attr_handler handler_for_type(enum nl80211_attrs type)
{
switch (type) {
case NL80211_ATTR_IFINDEX:
return extract_ifindex;
case NL80211_ATTR_WIPHY:
case NL80211_ATTR_IFTYPE:
case NL80211_ATTR_KEY_TYPE:
return extract_uint32;
case NL80211_ATTR_WDEV:
case NL80211_ATTR_COOKIE:
return extract_uint64;
case NL80211_ATTR_IFNAME:
case NL80211_ATTR_WIPHY_NAME:
return extract_name;
case NL80211_ATTR_REG_ALPHA2:
return extract_2_chars;
case NL80211_ATTR_MAC:
return extract_mac;
case NL80211_ATTR_ACK:
return extract_flag;
case NL80211_ATTR_WIPHY_FREQ:
case NL80211_ATTR_WIPHY_FREQ_OFFSET:
case NL80211_ATTR_WIPHY_CHANNEL_TYPE:
case NL80211_ATTR_CHANNEL_WIDTH:
case NL80211_ATTR_CENTER_FREQ1:
case NL80211_ATTR_CENTER_FREQ2:
return extract_uint32;
case NL80211_ATTR_FRAME:
return extract_iovec;
case NL80211_ATTR_WIPHY_BANDS:
return extract_nested;
case NL80211_ATTR_KEY_IDX:
return extract_u8;
default:
break;
}
return NULL;
}
struct attr_entry {
uint16_t type;
void *data;
attr_handler handler;
bool present : 1;
};
int nl80211_parse_attrs(struct l_genl_msg *msg, int tag, ...)
{
struct l_genl_attr attr;
va_list args;
struct l_queue *entries;
const struct l_queue_entry *e;
struct attr_entry *entry;
uint16_t type;
uint16_t len;
const void *data;
int ret;
if (!l_genl_attr_init(&attr, msg))
return -EINVAL;
va_start(args, tag);
entries = l_queue_new();
ret = -ENOSYS;
while (tag != NL80211_ATTR_UNSPEC) {
entry = l_new(struct attr_entry, 1);
entry->type = tag;
entry->data = va_arg(args, void *);
entry->handler = handler_for_type(tag);
l_queue_push_tail(entries, entry);
if (!entry->handler)
goto done;
tag = va_arg(args, enum nl80211_attrs);
}
va_end(args);
while (l_genl_attr_next(&attr, &type, &len, &data)) {
for (e = l_queue_get_entries(entries); e; e = e->next) {
entry = e->data;
if (entry->type == type)
break;
}
if (!e)
continue;
if (entry->present) {
ret = -EALREADY;
goto done;
}
/* For nested attributes use the outer attribute as data */
if (entry->handler == extract_nested)
data = &attr;
if (!entry->handler(data, len, entry->data)) {
ret = -EINVAL;
goto done;
}
entry->present = true;
}
ret = -ENOENT;
for (e = l_queue_get_entries(entries); e; e = e->next) {
entry = e->data;
if (entry->handler == extract_flag) {
*(bool *) entry->data = entry->present;
continue;
}
if (entry->present)
continue;
goto done;
}
ret = 0;
done:
l_queue_destroy(entries, l_free);
return ret;
}
struct l_genl_msg *nl80211_build_deauthenticate(uint32_t ifindex,
const uint8_t addr[static 6],
uint16_t reason_code)
{
struct l_genl_msg *msg;
msg = l_genl_msg_new_sized(NL80211_CMD_DEAUTHENTICATE, 128);
l_genl_msg_append_attr(msg, NL80211_ATTR_IFINDEX, 4, &ifindex);
l_genl_msg_append_attr(msg, NL80211_ATTR_REASON_CODE, 2, &reason_code);
l_genl_msg_append_attr(msg, NL80211_ATTR_MAC, ETH_ALEN, addr);
return msg;
}
struct l_genl_msg *nl80211_build_disconnect(uint32_t ifindex,
uint16_t reason_code)
{
struct l_genl_msg *msg;
msg = l_genl_msg_new_sized(NL80211_CMD_DISCONNECT, 64);
l_genl_msg_append_attr(msg, NL80211_ATTR_IFINDEX, 4, &ifindex);
l_genl_msg_append_attr(msg, NL80211_ATTR_REASON_CODE, 2, &reason_code);
return msg;
}
struct l_genl_msg *nl80211_build_del_station(uint32_t ifindex,
const uint8_t addr[static 6],
uint16_t reason_code,
uint8_t subtype)
{
struct l_genl_msg *msg;
msg = l_genl_msg_new_sized(NL80211_CMD_DEL_STATION, 64);
l_genl_msg_append_attr(msg, NL80211_ATTR_IFINDEX, 4, &ifindex);
l_genl_msg_append_attr(msg, NL80211_ATTR_MAC, 6, addr);
l_genl_msg_append_attr(msg, NL80211_ATTR_MGMT_SUBTYPE, 1, &subtype);
l_genl_msg_append_attr(msg, NL80211_ATTR_REASON_CODE, 2, &reason_code);
return msg;
}
struct l_genl_msg *nl80211_build_new_key_group(uint32_t ifindex, uint32_t cipher,
uint8_t key_id, const uint8_t *key,
size_t key_len, const uint8_t *ctr,
size_t ctr_len, const uint8_t *addr)
{
struct l_genl_msg *msg;
uint32_t type = NL80211_KEYTYPE_GROUP;
msg = l_genl_msg_new_sized(NL80211_CMD_NEW_KEY, 512);
l_genl_msg_append_attr(msg, NL80211_ATTR_IFINDEX, 4, &ifindex);
if (addr)
l_genl_msg_append_attr(msg, NL80211_ATTR_MAC, ETH_ALEN, addr);
l_genl_msg_enter_nested(msg, NL80211_ATTR_KEY);
l_genl_msg_append_attr(msg, NL80211_KEY_DATA, key_len, key);
l_genl_msg_append_attr(msg, NL80211_KEY_CIPHER, 4, &cipher);
l_genl_msg_append_attr(msg, NL80211_KEY_IDX, 1, &key_id);
if (ctr)
l_genl_msg_append_attr(msg, NL80211_KEY_SEQ, ctr_len, ctr);
l_genl_msg_append_attr(msg, NL80211_KEY_TYPE, 4, &type);
l_genl_msg_enter_nested(msg, NL80211_KEY_DEFAULT_TYPES);
l_genl_msg_append_attr(msg, NL80211_KEY_DEFAULT_TYPE_MULTICAST,
0, NULL);
l_genl_msg_leave_nested(msg);
l_genl_msg_leave_nested(msg);
return msg;
}
struct l_genl_msg *nl80211_build_new_key_pairwise(uint32_t ifindex,
uint32_t cipher,
const uint8_t addr[static 6],
const uint8_t *tk,
size_t tk_len,
uint8_t key_id)
{
struct l_genl_msg *msg;
msg = l_genl_msg_new_sized(NL80211_CMD_NEW_KEY, 512);
l_genl_msg_append_attr(msg, NL80211_ATTR_KEY_DATA, tk_len, tk);
l_genl_msg_append_attr(msg, NL80211_ATTR_KEY_CIPHER, 4, &cipher);
l_genl_msg_append_attr(msg, NL80211_ATTR_MAC, ETH_ALEN, addr);
l_genl_msg_append_attr(msg, NL80211_ATTR_KEY_IDX, 1, &key_id);
l_genl_msg_append_attr(msg, NL80211_ATTR_IFINDEX, 4, &ifindex);
return msg;
}
struct l_genl_msg *nl80211_build_new_rx_key_pairwise(uint32_t ifindex,
uint32_t cipher,
const uint8_t addr[static 6],
const uint8_t *tk,
size_t tk_len,
uint8_t key_id)
{
uint8_t key_mode = NL80211_KEY_NO_TX;
uint32_t key_type = NL80211_KEYTYPE_PAIRWISE;
struct l_genl_msg *msg;
msg = l_genl_msg_new_sized(NL80211_CMD_NEW_KEY, 512);
l_genl_msg_append_attr(msg, NL80211_ATTR_MAC, ETH_ALEN, addr);
l_genl_msg_append_attr(msg, NL80211_ATTR_IFINDEX, 4, &ifindex);
l_genl_msg_enter_nested(msg, NL80211_ATTR_KEY);
l_genl_msg_append_attr(msg, NL80211_KEY_DATA, tk_len, tk);
l_genl_msg_append_attr(msg, NL80211_KEY_CIPHER, 4, &cipher);
l_genl_msg_append_attr(msg, NL80211_KEY_IDX, 1, &key_id);
l_genl_msg_append_attr(msg, NL80211_KEY_MODE, 1, &key_mode);
l_genl_msg_append_attr(msg, NL80211_KEY_TYPE, 4, &key_type);
l_genl_msg_leave_nested(msg);
return msg;
}
struct l_genl_msg *nl80211_build_rekey_offload(uint32_t ifindex,
const uint8_t *kek,
const uint8_t *kck,
uint64_t replay_ctr)
{
struct l_genl_msg *msg;
msg = l_genl_msg_new_sized(NL80211_CMD_SET_REKEY_OFFLOAD, 512);
l_genl_msg_append_attr(msg, NL80211_ATTR_IFINDEX, 4, &ifindex);
l_genl_msg_enter_nested(msg, NL80211_ATTR_REKEY_DATA);
l_genl_msg_append_attr(msg, NL80211_REKEY_DATA_KEK,
NL80211_KEK_LEN, kek);
l_genl_msg_append_attr(msg, NL80211_REKEY_DATA_KCK,
NL80211_KCK_LEN, kck);
l_genl_msg_append_attr(msg, NL80211_REKEY_DATA_REPLAY_CTR,
NL80211_REPLAY_CTR_LEN, &replay_ctr);
l_genl_msg_leave_nested(msg);
return msg;
}
static struct l_genl_msg *nl80211_build_set_station(uint32_t ifindex,
const uint8_t *addr,
struct nl80211_sta_flag_update *flags)
{
struct l_genl_msg *msg;
msg = l_genl_msg_new_sized(NL80211_CMD_SET_STATION, 512);
l_genl_msg_append_attr(msg, NL80211_ATTR_IFINDEX, 4, &ifindex);
l_genl_msg_append_attr(msg, NL80211_ATTR_MAC, ETH_ALEN, addr);
l_genl_msg_append_attr(msg, NL80211_ATTR_STA_FLAGS2,
sizeof(struct nl80211_sta_flag_update), flags);
return msg;
}
struct l_genl_msg *nl80211_build_set_station_authorized(uint32_t ifindex,
const uint8_t *addr)
{
struct nl80211_sta_flag_update flags = {
.mask = (1 << NL80211_STA_FLAG_AUTHORIZED),
.set = (1 << NL80211_STA_FLAG_AUTHORIZED),
};
return nl80211_build_set_station(ifindex, addr, &flags);
}
struct l_genl_msg *nl80211_build_set_station_associated(uint32_t ifindex,
const uint8_t *addr)
{
struct nl80211_sta_flag_update flags = {
.mask = (1 << NL80211_STA_FLAG_AUTHENTICATED) |
(1 << NL80211_STA_FLAG_ASSOCIATED),
.set = (1 << NL80211_STA_FLAG_AUTHENTICATED) |
(1 << NL80211_STA_FLAG_ASSOCIATED),
};
return nl80211_build_set_station(ifindex, addr, &flags);
}
struct l_genl_msg *nl80211_build_set_station_unauthorized(uint32_t ifindex,
const uint8_t *addr)
{
struct nl80211_sta_flag_update flags = {
.mask = (1 << NL80211_STA_FLAG_AUTHORIZED),
.set = 0,
};
return nl80211_build_set_station(ifindex, addr, &flags);
}
struct l_genl_msg *nl80211_build_set_key(uint32_t ifindex, uint8_t key_index)
{
struct l_genl_msg *msg;
msg = l_genl_msg_new_sized(NL80211_CMD_SET_KEY, 128);
l_genl_msg_append_attr(msg, NL80211_ATTR_IFINDEX, 4, &ifindex);
l_genl_msg_enter_nested(msg, NL80211_ATTR_KEY);
l_genl_msg_append_attr(msg, NL80211_KEY_IDX, 1, &key_index);
l_genl_msg_append_attr(msg, NL80211_KEY_DEFAULT, 0, NULL);
l_genl_msg_enter_nested(msg, NL80211_KEY_DEFAULT_TYPES);
l_genl_msg_append_attr(msg, NL80211_KEY_DEFAULT_TYPE_MULTICAST,
0, NULL);
l_genl_msg_leave_nested(msg);
l_genl_msg_leave_nested(msg);
return msg;
}
struct l_genl_msg *nl80211_build_get_key(uint32_t ifindex, uint8_t key_index)
{
struct l_genl_msg *msg;
msg = l_genl_msg_new_sized(NL80211_CMD_GET_KEY, 128);
l_genl_msg_append_attr(msg, NL80211_ATTR_IFINDEX, 4, &ifindex);
l_genl_msg_append_attr(msg, NL80211_ATTR_KEY_IDX, 1, &key_index);
return msg;
}
const void *nl80211_parse_get_key_seq(struct l_genl_msg *msg)
{
struct l_genl_attr attr, nested;
uint16_t type, len;
const void *data;
if (l_genl_msg_get_error(msg) < 0 || !l_genl_attr_init(&attr, msg)) {
l_error("GET_KEY failed for the GTK: %i",
l_genl_msg_get_error(msg));
return NULL;
}
while (l_genl_attr_next(&attr, &type, &len, &data)) {
if (type != NL80211_ATTR_KEY)
continue;
break;
}
if (type != NL80211_ATTR_KEY || !l_genl_attr_recurse(&attr, &nested)) {
l_error("Can't recurse into ATTR_KEY in GET_KEY reply");
return NULL;
}
while (l_genl_attr_next(&nested, &type, &len, &data)) {
if (type != NL80211_KEY_SEQ)
continue;
break;
}
if (type != NL80211_KEY_SEQ) {
l_error("KEY_SEQ not returned in GET_KEY reply");
return NULL;
}
if (len != 6) {
l_error("KEY_SEQ length != 6 in GET_KEY reply");
return NULL;
}
return data;
}
struct l_genl_msg *nl80211_build_cmd_frame(uint32_t ifindex,
uint16_t frame_type,
const uint8_t *addr,
const uint8_t *to,
uint32_t freq,
struct iovec *iov,
size_t iov_len)
{
struct l_genl_msg *msg;
struct iovec iovs[iov_len + 1];
uint8_t hdr[24];
memset(hdr, 0, 24);
l_put_le16(frame_type, hdr + 0);
memcpy(hdr + 4, to, 6);
memcpy(hdr + 10, addr, 6);
memcpy(hdr + 16, to, 6);
iovs[0].iov_base = hdr;
iovs[0].iov_len = sizeof(hdr);
memcpy(iovs + 1, iov, sizeof(*iov) * iov_len);
msg = l_genl_msg_new_sized(NL80211_CMD_FRAME, 128 + 512);
l_genl_msg_append_attr(msg, NL80211_ATTR_IFINDEX, 4, &ifindex);
l_genl_msg_append_attr(msg, NL80211_ATTR_WIPHY_FREQ, 4, &freq);
l_genl_msg_append_attrv(msg, NL80211_ATTR_FRAME, iovs, iov_len + 1);
return msg;
}
int nl80211_parse_chandef(struct l_genl_msg *msg, struct band_chandef *out)
{
struct band_chandef t;
if (nl80211_parse_attrs(msg,
NL80211_ATTR_WIPHY_FREQ, &t.frequency,
NL80211_ATTR_CHANNEL_WIDTH, &t.channel_width,
NL80211_ATTR_CENTER_FREQ1, &t.center1_frequency,
NL80211_ATTR_UNSPEC) < 0)
return -ENOENT;
t.center2_frequency = 0;
/* Try to parse CENTER_FREQ2, but it is given only for 80P80 */
if (t.channel_width == NL80211_CHAN_WIDTH_80P80 &&
nl80211_parse_attrs(msg,
NL80211_ATTR_CENTER_FREQ2, &t.center2_frequency,
NL80211_ATTR_UNSPEC) < 0)
return -ENOENT;
memcpy(out, &t, sizeof(t));
return 0;
}
int nl80211_parse_supported_frequencies(struct l_genl_attr *band_freqs,
struct scan_freq_set *supported_list,
struct band_freq_attrs *list,
size_t num_channels)
{
uint16_t type, len;
const void *data;
struct l_genl_attr attr;
struct l_genl_attr nested;
uint8_t channel;
if (!l_genl_attr_recurse(band_freqs, &nested))
return -EBADMSG;
while (l_genl_attr_next(&nested, NULL, NULL, NULL)) {
uint32_t freq = 0;
struct band_freq_attrs freq_attr = { 0 };
if (!l_genl_attr_recurse(&nested, &attr))
continue;
while (l_genl_attr_next(&attr, &type, &len, &data)) {
switch (type) {
case NL80211_FREQUENCY_ATTR_FREQ:
freq = *((uint32_t *) data);
freq_attr.supported = true;
break;
case NL80211_FREQUENCY_ATTR_DISABLED:
freq_attr.disabled = true;
break;
case NL80211_FREQUENCY_ATTR_NO_IR:
freq_attr.no_ir = true;
break;
case NL80211_FREQUENCY_ATTR_NO_HT40_MINUS:
freq_attr.no_ht40_minus = true;
break;
case NL80211_FREQUENCY_ATTR_NO_HT40_PLUS:
freq_attr.no_ht40_plus = true;
break;
case NL80211_FREQUENCY_ATTR_NO_80MHZ:
freq_attr.no_80mhz = true;
break;
case NL80211_FREQUENCY_ATTR_NO_160MHZ:
freq_attr.no_160mhz = true;
break;
case NL80211_FREQUENCY_ATTR_NO_HE:
freq_attr.no_he = true;
break;
case NL80211_FREQUENCY_ATTR_MAX_TX_POWER:
freq_attr.tx_power = *((uint32_t *) data) / 100;
break;
}
}
if (!freq)
continue;
channel = band_freq_to_channel(freq, NULL);
if (!channel)
continue;
if (L_WARN_ON(channel > num_channels))
continue;
if (supported_list)
scan_freq_set_add(supported_list, freq);
list[channel] = freq_attr;
}
return 0;
}
void nl80211_append_rsn_attributes(struct l_genl_msg *msg,
struct handshake_state *hs)
{
uint32_t nl_cipher;
uint32_t nl_akm;
uint32_t wpa_version;
nl_cipher = ie_rsn_cipher_suite_to_cipher(hs->pairwise_cipher);
L_WARN_ON(!nl_cipher);
l_genl_msg_append_attr(msg, NL80211_ATTR_CIPHER_SUITES_PAIRWISE,
4, &nl_cipher);
nl_cipher = ie_rsn_cipher_suite_to_cipher(hs->group_cipher);
L_WARN_ON(!nl_cipher);
l_genl_msg_append_attr(msg, NL80211_ATTR_CIPHER_SUITE_GROUP,
4, &nl_cipher);
if (hs->mfp) {
uint32_t use_mfp = NL80211_MFP_REQUIRED;
l_genl_msg_append_attr(msg, NL80211_ATTR_USE_MFP, 4, &use_mfp);
}
nl_akm = ie_rsn_akm_suite_to_akm(hs->akm_suite);
L_WARN_ON(!nl_akm);
l_genl_msg_append_attr(msg, NL80211_ATTR_AKM_SUITES, 4, &nl_akm);
if (IE_AKM_IS_SAE(hs->akm_suite))
wpa_version = NL80211_WPA_VERSION_3;
else if (hs->wpa_ie)
wpa_version = NL80211_WPA_VERSION_1;
else
wpa_version = NL80211_WPA_VERSION_2;
l_genl_msg_append_attr(msg, NL80211_ATTR_WPA_VERSIONS,
4, &wpa_version);
}
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