696 lines
17 KiB
C
696 lines
17 KiB
C
/*
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*
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* Wireless daemon for Linux
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*
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* Copyright (C) 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 <stdlib.h>
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#include <stdio.h>
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#include <errno.h>
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#include <linux/if_ether.h>
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#include <fnmatch.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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#include "src/iwd.h"
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#include "src/module.h"
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#include "src/netdev.h"
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#include "src/wiphy.h"
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#include "src/util.h"
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#include "src/common.h"
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#include "src/nl80211cmd.h"
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static struct l_genl_family *nl80211 = NULL;
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static char **whitelist_filter;
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static char **blacklist_filter;
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static bool randomize;
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static bool use_default;
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struct wiphy_setup_state {
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uint32_t id;
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struct wiphy *wiphy;
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unsigned int pending_cmd_count;
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bool aborted;
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/*
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* Data we may need if the driver does not seem to support interface
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* manipulation and we fall back to using the driver-created default
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* interface.
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*/
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bool use_default;
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struct l_genl_msg *default_if_msg;
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};
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static struct l_queue *pending_wiphys;
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/* With these drivers don't even try creating our interfaces */
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static const char *default_if_driver_list[] = {
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/*
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* The out-of-tree rtl88x2bu crashes the kernel hard. Seemingly
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* many other drivers are built from the same source code so
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* blacklist all of them. Unfortunately there are in-tree drivers
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* that also match these names and may be fine. Use
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* UseDefaultInterface to override.
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*/
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"rtl81*",
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"rtl87*",
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"rtl88*",
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"rtw_*",
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NULL,
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};
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static void wiphy_setup_state_free(void *data)
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{
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struct wiphy_setup_state *state = data;
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if (state->default_if_msg)
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l_genl_msg_unref(state->default_if_msg);
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L_WARN_ON(state->pending_cmd_count);
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l_free(state);
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}
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static void wiphy_setup_state_destroy(struct wiphy_setup_state *state)
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{
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l_queue_remove(pending_wiphys, state);
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wiphy_setup_state_free(state);
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}
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static bool manager_use_default(struct wiphy_setup_state *state)
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{
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uint8_t addr_buf[6];
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uint8_t *addr = NULL;
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l_debug("");
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if (!state->default_if_msg) {
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l_error("No default interface for wiphy %u",
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(unsigned int) state->id);
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return false;
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}
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if (randomize) {
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wiphy_generate_random_address(state->wiphy, addr_buf);
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addr = addr_buf;
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}
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netdev_create_from_genl(state->default_if_msg, addr);
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return true;
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}
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static void manager_new_interface_cb(struct l_genl_msg *msg, void *user_data)
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{
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struct wiphy_setup_state *state = user_data;
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uint8_t addr_buf[6];
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uint8_t *addr = NULL;
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l_debug("");
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if (state->aborted)
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return;
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if (l_genl_msg_get_error(msg) < 0) {
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l_error("NEW_INTERFACE failed: %s",
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strerror(-l_genl_msg_get_error(msg)));
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/*
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* Nothing we can do to use this wiphy since by now we
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* will have successfully deleted any default interface
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* there may have been.
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*/
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return;
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}
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if (randomize && !wiphy_has_feature(state->wiphy,
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NL80211_FEATURE_MAC_ON_CREATE)) {
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wiphy_generate_random_address(state->wiphy, addr_buf);
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addr = addr_buf;
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}
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netdev_create_from_genl(msg, addr);
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}
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static void manager_new_interface_done(void *user_data)
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{
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struct wiphy_setup_state *state = user_data;
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state->pending_cmd_count--;
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wiphy_setup_state_destroy(state);
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}
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static void manager_create_interfaces(struct wiphy_setup_state *state)
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{
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struct l_genl_msg *msg;
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char ifname[10];
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uint32_t iftype = NL80211_IFTYPE_STATION;
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unsigned cmd_id;
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if (state->aborted)
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return;
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if (state->use_default) {
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manager_use_default(state);
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return;
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}
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/*
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* Current policy: we maintain one netdev per wiphy for station,
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* AP and Ad-Hoc modes, one optional p2p-device and zero or more
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* p2p-GOs or p2p-clients. The P2P-related interfaces will be
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* created on request.
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*/
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/* To be improved */
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snprintf(ifname, sizeof(ifname), "wlan%i", (int) state->id);
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l_debug("creating %s", ifname);
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msg = l_genl_msg_new(NL80211_CMD_NEW_INTERFACE);
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l_genl_msg_append_attr(msg, NL80211_ATTR_WIPHY, 4, &state->id);
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l_genl_msg_append_attr(msg, NL80211_ATTR_IFTYPE, 4, &iftype);
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l_genl_msg_append_attr(msg, NL80211_ATTR_IFNAME,
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strlen(ifname) + 1, ifname);
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l_genl_msg_append_attr(msg, NL80211_ATTR_4ADDR, 1, "\0");
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l_genl_msg_append_attr(msg, NL80211_ATTR_SOCKET_OWNER, 0, "");
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if (randomize && wiphy_has_feature(state->wiphy,
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NL80211_FEATURE_MAC_ON_CREATE)) {
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uint8_t random_addr[6];
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wiphy_generate_random_address(state->wiphy, random_addr);
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l_debug("Creating interface on phy: %s with random addr: "MAC,
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wiphy_get_name(state->wiphy),
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MAC_STR(random_addr));
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l_genl_msg_append_attr(msg, NL80211_ATTR_MAC, 6, random_addr);
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}
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cmd_id = l_genl_family_send(nl80211, msg,
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manager_new_interface_cb, state,
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manager_new_interface_done);
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if (!cmd_id) {
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l_error("Error sending NEW_INTERFACE for %s", ifname);
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return;
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}
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state->pending_cmd_count++;
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}
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static void manager_setup_cmd_done(void *user_data)
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{
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struct wiphy_setup_state *state = user_data;
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state->pending_cmd_count--;
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if (state->pending_cmd_count)
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return;
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manager_create_interfaces(state);
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if (!state->pending_cmd_count)
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wiphy_setup_state_destroy(state);
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}
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static void manager_del_interface_cb(struct l_genl_msg *msg, void *user_data)
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{
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struct wiphy_setup_state *state = user_data;
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l_debug("");
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if (state->aborted)
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return;
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if (l_genl_msg_get_error(msg) < 0) {
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l_error("DEL_INTERFACE failed: %s",
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strerror(-l_genl_msg_get_error(msg)));
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state->use_default = true;
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}
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}
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static void manager_get_interface_cb(struct l_genl_msg *msg, void *user_data)
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{
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struct wiphy_setup_state *state = user_data;
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uint32_t wiphy;
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uint32_t ifindex;
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uint32_t iftype;
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uint64_t wdev;
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const char *ifname;
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struct l_genl_msg *del_msg;
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unsigned cmd_id;
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char *pattern;
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unsigned int i;
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bool whitelisted = false, blacklisted = false;
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l_debug("");
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if (state->aborted)
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return;
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if (nl80211_parse_attrs(msg, NL80211_ATTR_WDEV, &wdev,
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NL80211_ATTR_WIPHY, &wiphy,
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NL80211_ATTR_IFTYPE, &iftype,
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NL80211_ATTR_UNSPEC) < 0)
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return;
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if (wiphy != state->id) {
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l_debug("Wiphy attribute mis-match, wanted: %u, got %u",
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state->id, wiphy);
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return;
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}
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if (nl80211_parse_attrs(msg, NL80211_ATTR_IFINDEX, &ifindex,
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NL80211_ATTR_IFNAME, &ifname,
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NL80211_ATTR_UNSPEC) < 0)
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goto delete_interface;
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if (whitelist_filter) {
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for (i = 0; (pattern = whitelist_filter[i]); i++) {
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if (fnmatch(pattern, ifname, 0) != 0)
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continue;
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whitelisted = true;
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break;
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}
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}
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if (blacklist_filter) {
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for (i = 0; (pattern = blacklist_filter[i]); i++) {
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if (fnmatch(pattern, ifname, 0) != 0)
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continue;
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blacklisted = true;
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break;
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}
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}
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/*
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* If this interface is usable as our default netdev in case the
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* driver does not support interface manipulation, save the message
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* just in case.
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*/
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if ((iftype == NL80211_IFTYPE_ADHOC ||
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iftype == NL80211_IFTYPE_STATION ||
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iftype == NL80211_IFTYPE_AP) &&
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!state->default_if_msg &&
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(!whitelist_filter || whitelisted) &&
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!blacklisted)
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state->default_if_msg = l_genl_msg_ref(msg);
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delete_interface:
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if (state->use_default)
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return;
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del_msg = l_genl_msg_new(NL80211_CMD_DEL_INTERFACE);
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l_genl_msg_append_attr(del_msg, NL80211_ATTR_WDEV, 8, &wdev);
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l_genl_msg_append_attr(del_msg, NL80211_ATTR_WIPHY, 4, &state->id);
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cmd_id = l_genl_family_send(nl80211, del_msg,
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manager_del_interface_cb, state,
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manager_setup_cmd_done);
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if (!cmd_id) {
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l_error("Sending DEL_INTERFACE for wdev: %" PRIu64" failed",
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wdev);
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state->use_default = true;
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return;
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}
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l_debug("");
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state->pending_cmd_count++;
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}
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static struct wiphy_setup_state *manager_rx_cmd_new_wiphy(
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struct l_genl_msg *msg)
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{
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struct wiphy_setup_state *state = NULL;
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struct wiphy *wiphy;
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uint32_t id;
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const char *name;
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const char *driver, **driver_bad;
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if (nl80211_parse_attrs(msg, NL80211_ATTR_WIPHY, &id,
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NL80211_ATTR_WIPHY_NAME, &name,
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NL80211_ATTR_UNSPEC) < 0)
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return NULL;
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/*
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* A Wiphy split dump can generate many (6+) NEW_WIPHY messages
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* We need to parse attributes from all of them, but only perform
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* initialization steps once for each new wiphy detected
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*/
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wiphy = wiphy_find(id);
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if (wiphy)
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goto done;
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wiphy = wiphy_create(id, name);
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if (!wiphy)
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return NULL;
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state = l_new(struct wiphy_setup_state, 1);
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state->id = id;
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state->wiphy = wiphy;
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state->use_default = use_default;
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l_queue_push_tail(pending_wiphys, state);
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driver = wiphy_get_driver(wiphy);
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for (driver_bad = default_if_driver_list; *driver_bad; driver_bad++)
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if (fnmatch(*driver_bad, driver, 0) == 0)
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state->use_default = true;
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/*
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* If whitelist/blacklist were given only try to use existing
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* interfaces same as when the driver does not support NEW_INTERFACE
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* or DEL_INTERFACE, otherwise the interface names will become
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* meaningless after we've created our own interface(s). Optimally
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* phy name white/blacklists should be used.
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*/
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if (whitelist_filter || blacklist_filter)
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state->use_default = true;
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if (state->use_default)
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l_info("Wiphy %s will only use the default interface", name);
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done:
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wiphy_update_from_genl(wiphy, name, msg);
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return state;
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}
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static bool manager_wiphy_state_match(const void *a, const void *b)
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{
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const struct wiphy_setup_state *state = a;
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uint32_t id = L_PTR_TO_UINT(b);
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return (state->id == id);
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}
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static struct wiphy_setup_state *manager_find_pending(uint32_t id)
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{
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return l_queue_find(pending_wiphys, manager_wiphy_state_match,
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L_UINT_TO_PTR(id));
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}
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static uint32_t manager_parse_ifindex(struct l_genl_msg *msg)
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{
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uint32_t ifindex;
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if (nl80211_parse_attrs(msg, NL80211_ATTR_IFINDEX, &ifindex,
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NL80211_ATTR_UNSPEC) < 0)
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return -1;
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return ifindex;
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}
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static uint32_t manager_parse_wiphy_id(struct l_genl_msg *msg)
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{
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uint32_t wiphy;
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if (nl80211_parse_attrs(msg, NL80211_ATTR_WIPHY, &wiphy,
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NL80211_ATTR_UNSPEC) < 0)
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return -1;
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return wiphy;
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}
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static void manager_del_wiphy_event(struct l_genl_msg *msg)
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{
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struct wiphy_setup_state *state;
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struct wiphy *wiphy;
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uint32_t id;
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id = manager_parse_wiphy_id(msg);
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state = manager_find_pending(id);
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if (state) {
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if (state->pending_cmd_count)
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state->aborted = true;
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else
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wiphy_setup_state_destroy(state);
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}
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wiphy = wiphy_find(id);
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if (wiphy)
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wiphy_destroy(wiphy);
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}
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static void manager_interface_dump_callback(struct l_genl_msg *msg,
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void *user_data)
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{
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struct wiphy_setup_state *state;
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l_debug("");
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state = manager_find_pending(manager_parse_wiphy_id(msg));
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if (!state)
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return;
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manager_get_interface_cb(msg, state);
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}
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static bool manager_check_create_interfaces(const void *a, const void *b)
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{
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struct wiphy_setup_state *state = (void *) a;
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wiphy_create_complete(state->wiphy);
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if (state->pending_cmd_count)
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return false;
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/* If we are here, then there are no interfaces for this phy */
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manager_create_interfaces(state);
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if (state->pending_cmd_count)
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return false;
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wiphy_setup_state_free(state);
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return true;
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}
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static void manager_interface_dump_done(void *user_data)
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{
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l_queue_remove_if(pending_wiphys,
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manager_check_create_interfaces, NULL);
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}
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static void manager_wiphy_dump_callback(struct l_genl_msg *msg, void *user_data)
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{
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l_debug("");
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manager_rx_cmd_new_wiphy(msg);
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}
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static void manager_new_wiphy_event(struct l_genl_msg *msg)
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{
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unsigned int wiphy_cmd_id;
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unsigned int iface_cmd_id;
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uint32_t wiphy_id;
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if (!pending_wiphys)
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return;
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wiphy_id = manager_parse_wiphy_id(msg);
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/*
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* Until fixed, a NEW_WIPHY event will not include all the information
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* that may be available, but a dump will. Because of this we do both
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* GET_WIPHY/GET_INTERFACE, same as we would during initalization.
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*/
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msg = l_genl_msg_new_sized(NL80211_CMD_GET_WIPHY, 128);
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l_genl_msg_append_attr(msg, NL80211_ATTR_SPLIT_WIPHY_DUMP, 0, NULL);
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l_genl_msg_append_attr(msg, NL80211_ATTR_WIPHY, 4, &wiphy_id);
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wiphy_cmd_id = l_genl_family_dump(nl80211, msg,
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manager_wiphy_dump_callback,
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NULL, NULL);
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if (!wiphy_cmd_id) {
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l_error("Could not dump wiphy %u", wiphy_id);
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l_genl_msg_unref(msg);
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return;
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}
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/*
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* As the first step after new wiphy is detected we will query
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* the initial interface setup, delete the default interfaces
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* and create interfaces for our own use with NL80211_ATTR_SOCKET_OWNER
|
|
* on them. After that if new interfaces are created outside of
|
|
* IWD, or removed outside of IWD, we don't touch them and will
|
|
* try to minimally adapt to handle the removals correctly. It's
|
|
* a very unlikely situation in any case but it wouldn't make
|
|
* sense to try to continually enforce our setup fighting against
|
|
* some other process, and it wouldn't make sense to try to
|
|
* manage and use additional interfaces beyond the one or two
|
|
* we need for our operations.
|
|
*/
|
|
msg = l_genl_msg_new(NL80211_CMD_GET_INTERFACE);
|
|
l_genl_msg_append_attr(msg, NL80211_ATTR_WIPHY, 4, &wiphy_id);
|
|
|
|
iface_cmd_id = l_genl_family_dump(nl80211, msg,
|
|
manager_interface_dump_callback,
|
|
NULL, manager_interface_dump_done);
|
|
|
|
if (!iface_cmd_id) {
|
|
l_error("Could not dump interface for wiphy %u", wiphy_id);
|
|
l_genl_family_cancel(nl80211, wiphy_cmd_id);
|
|
l_genl_msg_unref(msg);
|
|
}
|
|
}
|
|
|
|
static void manager_config_notify(struct l_genl_msg *msg, void *user_data)
|
|
{
|
|
uint8_t cmd;
|
|
struct netdev *netdev;
|
|
|
|
cmd = l_genl_msg_get_command(msg);
|
|
|
|
l_debug("Notification of command %s(%u)",
|
|
nl80211cmd_to_string(cmd), cmd);
|
|
|
|
switch (cmd) {
|
|
case NL80211_CMD_NEW_WIPHY:
|
|
manager_new_wiphy_event(msg);
|
|
break;
|
|
|
|
case NL80211_CMD_DEL_WIPHY:
|
|
manager_del_wiphy_event(msg);
|
|
break;
|
|
|
|
case NL80211_CMD_NEW_INTERFACE:
|
|
/*
|
|
* TODO: Until NEW_WIPHY contains all required information we
|
|
* are stuck always having to do a full dump. This specific
|
|
* interface must also be dumped, and this is taken care of
|
|
* in manager_new_wiphy_event.
|
|
*/
|
|
break;
|
|
|
|
case NL80211_CMD_DEL_INTERFACE:
|
|
netdev = netdev_find(manager_parse_ifindex(msg));
|
|
if (!netdev)
|
|
break;
|
|
|
|
netdev_destroy(netdev);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static int manager_init(void)
|
|
{
|
|
struct l_genl *genl = iwd_get_genl();
|
|
const struct l_settings *config = iwd_get_config();
|
|
struct l_genl_msg *msg;
|
|
unsigned int wiphy_dump;
|
|
unsigned int interface_dump;
|
|
const char *randomize_str;
|
|
const char *if_whitelist = iwd_get_iface_whitelist();
|
|
const char *if_blacklist = iwd_get_iface_blacklist();
|
|
|
|
nl80211 = l_genl_family_new(genl, NL80211_GENL_NAME);
|
|
|
|
if (if_whitelist)
|
|
whitelist_filter = l_strsplit(if_whitelist, ',');
|
|
|
|
if (if_blacklist)
|
|
blacklist_filter = l_strsplit(if_blacklist, ',');
|
|
|
|
pending_wiphys = l_queue_new();
|
|
|
|
if (!l_genl_family_register(nl80211, "config", manager_config_notify,
|
|
NULL, NULL)) {
|
|
l_error("Registering for config notifications failed");
|
|
goto error;
|
|
}
|
|
|
|
msg = l_genl_msg_new_sized(NL80211_CMD_GET_WIPHY, 128);
|
|
l_genl_msg_append_attr(msg, NL80211_ATTR_SPLIT_WIPHY_DUMP, 0, NULL);
|
|
wiphy_dump = l_genl_family_dump(nl80211, msg,
|
|
manager_wiphy_dump_callback,
|
|
NULL, NULL);
|
|
if (!wiphy_dump) {
|
|
l_error("Initial wiphy information dump failed");
|
|
l_genl_msg_unref(msg);
|
|
goto error;
|
|
}
|
|
|
|
msg = l_genl_msg_new(NL80211_CMD_GET_INTERFACE);
|
|
interface_dump = l_genl_family_dump(nl80211, msg,
|
|
manager_interface_dump_callback,
|
|
NULL,
|
|
manager_interface_dump_done);
|
|
if (!interface_dump) {
|
|
l_error("Initial interface information dump failed");
|
|
l_genl_msg_unref(msg);
|
|
l_genl_family_cancel(nl80211, wiphy_dump);
|
|
goto error;
|
|
}
|
|
|
|
randomize_str = l_settings_get_value(config, "General",
|
|
"AddressRandomization");
|
|
if (randomize_str) {
|
|
if (!strcmp(randomize_str, "once"))
|
|
randomize = true;
|
|
else if (!strcmp(randomize_str, "disabled"))
|
|
randomize = false;
|
|
else
|
|
l_warn("Invalid [General].AddressRandomization"
|
|
" value: %s", randomize_str);
|
|
}
|
|
|
|
if (!l_settings_get_bool(config, "General",
|
|
"UseDefaultInterface", &use_default)) {
|
|
if (!l_settings_get_bool(config, "General",
|
|
"use_default_interface", &use_default))
|
|
use_default = false;
|
|
else
|
|
l_warn("[General].use_default_interface is deprecated"
|
|
", please use UseDefaultInterface");
|
|
}
|
|
|
|
return 0;
|
|
|
|
error:
|
|
l_queue_destroy(pending_wiphys, NULL);
|
|
pending_wiphys = NULL;
|
|
|
|
l_genl_family_free(nl80211);
|
|
nl80211 = NULL;
|
|
|
|
return -EIO;
|
|
}
|
|
|
|
static void manager_exit(void)
|
|
{
|
|
l_strfreev(whitelist_filter);
|
|
l_strfreev(blacklist_filter);
|
|
|
|
l_queue_destroy(pending_wiphys, wiphy_setup_state_free);
|
|
pending_wiphys = NULL;
|
|
|
|
l_genl_family_free(nl80211);
|
|
nl80211 = NULL;
|
|
randomize = false;
|
|
}
|
|
|
|
IWD_MODULE(manager, manager_init, manager_exit);
|