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/*
* Copyright (C) 2022 The Android Open Source Project
*
* Portions copyright (C) 2023 Broadcom Limited
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <stdint.h>
#include <fcntl.h>
#include <sys/socket.h>
#include <netlink/genl/genl.h>
#include <netlink/genl/family.h>
#include <netlink/genl/ctrl.h>
#include <linux/rtnetlink.h>
#include <netpacket/packet.h>
#include <linux/filter.h>
#include <linux/errqueue.h>
#include <linux/pkt_sched.h>
#include <netlink/object-api.h>
#include <netlink/netlink.h>
#include <netlink/socket.h>
#include <netlink/handlers.h>
#include "sync.h"
#define LOG_TAG "WifiHAL"
#include <utils/Log.h>
#include <hardware_legacy/wifi_hal.h>
#include "common.h"
#include "cpp_bindings.h"
#define CACHE_SCAN_RESULT_SIZE sizeof(wifi_cached_scan_result)
#define MAX_CACHE_SCAN_RESULT_SIZE (MAX_CACHED_SCAN_RESULT*CACHE_SCAN_RESULT_SIZE)
typedef enum {
WIFI_ATTRIBUTE_CACHED_SCAN_INVALID = 0,
WIFI_ATTRIBUTE_CACHED_SCAN_BOOT_TIMESTAMP = 1,
WIFI_ATTRIBUTE_CACHED_SCANNED_FREQ_NUM = 2,
WIFI_ATTRIBUTE_CACHED_SCANNED_FREQ_LIST = 3,
WIFI_ATTRIBUTE_CACHED_SCAN_RESULT_CNT = 4,
WIFI_ATTRIBUTE_CACHED_SCAN_RESULTS = 5,
WIFI_ATTRIBUTE_CACHED_SCAN_MAX
} SCAN_ATTRIBUTE;
/////////////////////////////////////////////////////////////////////////////
class GetCachedScanResultsCommand : public WifiCommand {
wifi_cached_scan_result_handler mHandler;
wifi_cached_scan_report *mReport;
public:
GetCachedScanResultsCommand(wifi_interface_handle iface, int id,
wifi_cached_scan_result_handler handler)
: WifiCommand("GetCachedScanResultsCommand", iface, id), mHandler(handler)
{
mReport = NULL;
}
virtual int create() {
ALOGE("Creating message to get cached scan results");
int ret = mMsg.create(GOOGLE_OUI, WIFI_SUBCMD_GET_CACHED_SCAN_RESULTS);
if (ret < 0) {
return ret;
}
return ret;
}
protected:
virtual int handleResponse(WifiEvent& reply) {
ALOGI("In GetCachedScanResultsCommand::handleResponse");
if (reply.get_cmd() != NL80211_CMD_VENDOR) {
ALOGD("Ignoring reply with cmd = %d", reply.get_cmd());
return NL_SKIP;
}
int id = reply.get_vendor_id();
int subcmd = reply.get_vendor_subcmd();
int valid_entries = 0;
int result_size = 0;
wifi_timestamp timestamp = 0;
int size = 0;
ALOGV("Id = %0x, subcmd = %d", id, subcmd);
nlattr *vendor_data = reply.get_attribute(NL80211_ATTR_VENDOR_DATA);
int len = reply.get_vendor_data_len();
if (vendor_data == NULL || len == 0) {
ALOGE("no vendor data in GetCachedScanResults response; ignoring it");
return NL_SKIP;
}
mReport = (wifi_cached_scan_report *)malloc(sizeof(wifi_cached_scan_report));
if (mReport == NULL) {
ALOGE("Failed to allocate!!\n");
return NL_SKIP;
}
memset(mReport, 0, sizeof(wifi_cached_scan_report));
ALOGV("Id = %0x, subcmd = %d, len = %d", id, subcmd, len);
for (nl_iterator it(vendor_data); it.has_next(); it.next()) {
if (it.get_type() == WIFI_ATTRIBUTE_CACHED_SCAN_BOOT_TIMESTAMP) {
timestamp = it.get_u32();
ALOGV("Time since boot_ms: %ld\n", timestamp);
} else if (it.get_type() == WIFI_ATTRIBUTE_CACHED_SCAN_RESULT_CNT) {
valid_entries = min(it.get_u16(), MAX_CACHED_SCAN_RESULT);
ALOGV("cached scan result cnt: %d", valid_entries);
} else if ((it.get_type() == WIFI_ATTRIBUTE_CACHED_SCAN_RESULTS) &&
valid_entries && timestamp) {
size = min(it.get_len(), MAX_CACHE_SCAN_RESULT_SIZE);
if (size > (valid_entries*CACHE_SCAN_RESULT_SIZE)) {
ALOGE("Not enough space to copy!!\n");
return NL_SKIP;
}
result_size = valid_entries * CACHE_SCAN_RESULT_SIZE;
mReport->results = (wifi_cached_scan_result *)malloc(result_size);
if (mReport->results == NULL) {
ALOGE("Failed to allocate!!\n");
return NL_SKIP;
}
memcpy((void *)mReport->results, (void *)it.get_data(), size);
} else {
ALOGW("Ignoring invalid attribute type = %d, size = %d",
it.get_type(), it.get_len());
}
}
mReport->ts = timestamp;
mReport->result_cnt = valid_entries;
if (*mHandler.on_cached_scan_results && mReport) {
(*mHandler.on_cached_scan_results)(mReport);
ALOGV("Notified cache scan report!!");
}
if (mReport) {
if (mReport->results) {
free((void *)mReport->results);
}
free(mReport);
}
return NL_OK;
}
};
wifi_error wifi_get_cached_scan_results(wifi_interface_handle iface,
wifi_cached_scan_result_handler handler)
{
ALOGI("Getting cached scan results, iface handle = %p", iface);
GetCachedScanResultsCommand command(iface, 0, handler);
return (wifi_error) command.requestResponse();
}
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