401 lines
8.9 KiB
C
401 lines
8.9 KiB
C
/*
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*
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* Wireless daemon for Linux
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*
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* Copyright (C) 2018-2019 Intel Corporation. All rights reserved.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include <errno.h>
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#include <linux/if_ether.h>
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#include <ell/ell.h>
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#include "linux/nl80211.h"
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#include "src/nl80211util.h"
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typedef bool (*attr_handler)(const void *data, uint16_t len, void *o);
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static bool extract_ifindex(const void *data, uint16_t len, void *o)
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{
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uint32_t *out = o;
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if (len != 4)
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return false;
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/* ifindex cannot be 0 */
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if (l_get_u32(data) == 0)
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return false;
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*out = l_get_u32(data);
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return true;
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}
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static bool extract_name(const void *data, uint16_t len, void *o)
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{
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const char **out = o;
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if (len < 1)
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return false;
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if (!memchr(data + 1, 0, len - 1))
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return false;
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*out = data;
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return true;
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}
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static bool extract_mac(const void *data, uint16_t len, void *o)
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{
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const uint8_t **out = o;
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if (len != 6)
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return false;
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*out = data;
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return true;
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}
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static bool extract_uint64(const void *data, uint16_t len, void *o)
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{
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uint64_t *out = o;
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if (len != 8)
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return false;
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*out = l_get_u64(data);
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return true;
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}
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static bool extract_uint32(const void *data, uint16_t len, void *o)
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{
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uint32_t *out = o;
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if (len != 4)
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return false;
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*out = l_get_u32(data);
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return true;
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}
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static attr_handler handler_for_type(enum nl80211_attrs type)
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{
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switch (type) {
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case NL80211_ATTR_IFINDEX:
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return extract_ifindex;
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case NL80211_ATTR_WIPHY:
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case NL80211_ATTR_IFTYPE:
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return extract_uint32;
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case NL80211_ATTR_WDEV:
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case NL80211_ATTR_COOKIE:
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return extract_uint64;
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case NL80211_ATTR_IFNAME:
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case NL80211_ATTR_WIPHY_NAME:
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return extract_name;
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case NL80211_ATTR_MAC:
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return extract_mac;
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default:
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break;
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}
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return NULL;
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}
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struct attr_entry {
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uint16_t type;
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void *data;
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attr_handler handler;
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bool present : 1;
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};
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int nl80211_parse_attrs(struct l_genl_msg *msg, int tag, ...)
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{
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struct l_genl_attr attr;
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va_list args;
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struct l_queue *entries;
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const struct l_queue_entry *e;
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struct attr_entry *entry;
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uint16_t type;
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uint16_t len;
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const void *data;
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int ret;
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if (!l_genl_attr_init(&attr, msg))
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return -EINVAL;
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va_start(args, tag);
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entries = l_queue_new();
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ret = -ENOSYS;
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while (tag != NL80211_ATTR_UNSPEC) {
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entry = l_new(struct attr_entry, 1);
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entry->type = tag;
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entry->data = va_arg(args, void *);
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entry->handler = handler_for_type(tag);
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l_queue_push_tail(entries, entry);
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if (!entry->handler)
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goto done;
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tag = va_arg(args, enum nl80211_attrs);
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}
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va_end(args);
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while (l_genl_attr_next(&attr, &type, &len, &data)) {
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for (e = l_queue_get_entries(entries); e; e = e->next) {
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entry = e->data;
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if (entry->type == type)
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break;
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}
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if (!e)
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continue;
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if (entry->present) {
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ret = -EALREADY;
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goto done;
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}
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if (!entry->handler(data, len, entry->data)) {
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ret = -EINVAL;
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goto done;
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}
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entry->present = true;
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}
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ret = -ENOENT;
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for (e = l_queue_get_entries(entries); e; e = e->next) {
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entry = e->data;
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if (entry->present)
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continue;
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goto done;
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}
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ret = 0;
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done:
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l_queue_destroy(entries, l_free);
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return ret;
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}
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struct l_genl_msg *nl80211_build_new_key_group(uint32_t ifindex, uint32_t cipher,
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uint8_t key_id, const uint8_t *key,
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size_t key_len, const uint8_t *ctr,
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size_t ctr_len, const uint8_t *addr)
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{
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struct l_genl_msg *msg;
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msg = l_genl_msg_new_sized(NL80211_CMD_NEW_KEY, 512);
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l_genl_msg_append_attr(msg, NL80211_ATTR_IFINDEX, 4, &ifindex);
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if (addr)
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l_genl_msg_append_attr(msg, NL80211_ATTR_MAC, ETH_ALEN, addr);
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l_genl_msg_enter_nested(msg, NL80211_ATTR_KEY);
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l_genl_msg_append_attr(msg, NL80211_KEY_DATA, key_len, key);
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l_genl_msg_append_attr(msg, NL80211_KEY_CIPHER, 4, &cipher);
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l_genl_msg_append_attr(msg, NL80211_KEY_IDX, 1, &key_id);
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if (ctr)
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l_genl_msg_append_attr(msg, NL80211_KEY_SEQ, ctr_len, ctr);
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if (addr) {
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uint32_t type = NL80211_KEYTYPE_GROUP;
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l_genl_msg_append_attr(msg, NL80211_KEY_TYPE, 4, &type);
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l_genl_msg_enter_nested(msg, NL80211_KEY_DEFAULT_TYPES);
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l_genl_msg_append_attr(msg, NL80211_KEY_DEFAULT_TYPE_MULTICAST,
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0, NULL);
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l_genl_msg_leave_nested(msg);
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}
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l_genl_msg_leave_nested(msg);
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return msg;
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}
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static struct l_genl_msg *nl80211_build_set_station(uint32_t ifindex,
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const uint8_t *addr,
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struct nl80211_sta_flag_update *flags)
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{
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struct l_genl_msg *msg;
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msg = l_genl_msg_new_sized(NL80211_CMD_SET_STATION, 512);
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l_genl_msg_append_attr(msg, NL80211_ATTR_IFINDEX, 4, &ifindex);
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l_genl_msg_append_attr(msg, NL80211_ATTR_MAC, ETH_ALEN, addr);
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l_genl_msg_append_attr(msg, NL80211_ATTR_STA_FLAGS2,
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sizeof(struct nl80211_sta_flag_update), flags);
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return msg;
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}
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struct l_genl_msg *nl80211_build_set_station_authorized(uint32_t ifindex,
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const uint8_t *addr)
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{
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struct nl80211_sta_flag_update flags = {
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.mask = (1 << NL80211_STA_FLAG_AUTHORIZED),
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.set = (1 << NL80211_STA_FLAG_AUTHORIZED),
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};
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return nl80211_build_set_station(ifindex, addr, &flags);
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}
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struct l_genl_msg *nl80211_build_set_station_associated(uint32_t ifindex,
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const uint8_t *addr)
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{
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struct nl80211_sta_flag_update flags = {
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.mask = (1 << NL80211_STA_FLAG_AUTHENTICATED) |
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(1 << NL80211_STA_FLAG_ASSOCIATED),
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.set = (1 << NL80211_STA_FLAG_AUTHENTICATED) |
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(1 << NL80211_STA_FLAG_ASSOCIATED),
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};
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return nl80211_build_set_station(ifindex, addr, &flags);
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}
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struct l_genl_msg *nl80211_build_set_station_unauthorized(uint32_t ifindex,
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const uint8_t *addr)
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{
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struct nl80211_sta_flag_update flags = {
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.mask = (1 << NL80211_STA_FLAG_AUTHORIZED),
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.set = 0,
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};
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return nl80211_build_set_station(ifindex, addr, &flags);
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}
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struct l_genl_msg *nl80211_build_set_key(uint32_t ifindex, uint8_t key_index)
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{
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struct l_genl_msg *msg;
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msg = l_genl_msg_new_sized(NL80211_CMD_SET_KEY, 128);
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l_genl_msg_append_attr(msg, NL80211_ATTR_IFINDEX, 4, &ifindex);
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l_genl_msg_enter_nested(msg, NL80211_ATTR_KEY);
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l_genl_msg_append_attr(msg, NL80211_KEY_IDX, 1, &key_index);
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l_genl_msg_append_attr(msg, NL80211_KEY_DEFAULT, 0, NULL);
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l_genl_msg_enter_nested(msg, NL80211_KEY_DEFAULT_TYPES);
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l_genl_msg_append_attr(msg, NL80211_KEY_DEFAULT_TYPE_MULTICAST,
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0, NULL);
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l_genl_msg_leave_nested(msg);
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l_genl_msg_leave_nested(msg);
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return msg;
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}
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struct l_genl_msg *nl80211_build_get_key(uint32_t ifindex, uint8_t key_index)
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{
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struct l_genl_msg *msg;
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msg = l_genl_msg_new_sized(NL80211_CMD_GET_KEY, 128);
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l_genl_msg_append_attr(msg, NL80211_ATTR_IFINDEX, 4, &ifindex);
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l_genl_msg_append_attr(msg, NL80211_ATTR_KEY_IDX, 1, &key_index);
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return msg;
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}
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const void *nl80211_parse_get_key_seq(struct l_genl_msg *msg)
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{
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struct l_genl_attr attr, nested;
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uint16_t type, len;
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const void *data;
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if (l_genl_msg_get_error(msg) < 0 || !l_genl_attr_init(&attr, msg)) {
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l_error("GET_KEY failed for the GTK: %i",
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l_genl_msg_get_error(msg));
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return NULL;
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}
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while (l_genl_attr_next(&attr, &type, &len, &data)) {
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if (type != NL80211_ATTR_KEY)
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continue;
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break;
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}
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if (type != NL80211_ATTR_KEY || !l_genl_attr_recurse(&attr, &nested)) {
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l_error("Can't recurse into ATTR_KEY in GET_KEY reply");
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return NULL;
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}
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while (l_genl_attr_next(&nested, &type, &len, &data)) {
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if (type != NL80211_KEY_SEQ)
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continue;
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break;
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}
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if (type != NL80211_KEY_SEQ) {
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l_error("KEY_SEQ not returned in GET_KEY reply");
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return NULL;
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}
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if (len != 6) {
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l_error("KEY_SEQ length != 6 in GET_KEY reply");
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return NULL;
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}
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return data;
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}
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struct l_genl_msg *nl80211_build_cmd_frame(uint32_t ifindex,
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const uint8_t *addr,
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const uint8_t *to,
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uint32_t freq,
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struct iovec *iov,
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size_t iov_len)
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{
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struct l_genl_msg *msg;
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struct iovec iovs[iov_len + 1];
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const uint16_t frame_type = 0x00d0;
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uint8_t action_frame[24];
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memset(action_frame, 0, 24);
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l_put_le16(frame_type, action_frame + 0);
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memcpy(action_frame + 4, to, 6);
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memcpy(action_frame + 10, addr, 6);
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memcpy(action_frame + 16, to, 6);
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iovs[0].iov_base = action_frame;
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iovs[0].iov_len = sizeof(action_frame);
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memcpy(iovs + 1, iov, sizeof(*iov) * iov_len);
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msg = l_genl_msg_new_sized(NL80211_CMD_FRAME, 128 + 512);
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l_genl_msg_append_attr(msg, NL80211_ATTR_IFINDEX, 4, &ifindex);
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l_genl_msg_append_attr(msg, NL80211_ATTR_WIPHY_FREQ, 4, &freq);
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l_genl_msg_append_attrv(msg, NL80211_ATTR_FRAME, iovs, iov_len + 1);
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return msg;
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}
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