154 lines
5.3 KiB
C
154 lines
5.3 KiB
C
/*
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Copyright (c) 2016, Julian Kornberger <jk+freifunk@digineo.de>
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Martin Müller <geno+ffhb@fireorbit.de>
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Jan-Philipp Litza <janphilipp@litza.de>
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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1. Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright notice,
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this list of conditions and the following disclaimer in the documentation
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and/or other materials provided with the distribution.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <linux/nl80211.h>
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#include <netlink/genl/genl.h>
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#include "netlink.h"
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#include "airtime.h"
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/*
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* Excerpt from nl80211.h:
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* enum nl80211_survey_info - survey information
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*
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* These attribute types are used with %NL80211_ATTR_SURVEY_INFO
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* when getting information about a survey.
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*
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* @__NL80211_SURVEY_INFO_INVALID: attribute number 0 is reserved
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* @NL80211_SURVEY_INFO_FREQUENCY: center frequency of channel
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* @NL80211_SURVEY_INFO_NOISE: noise level of channel (u8, dBm)
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* @NL80211_SURVEY_INFO_IN_USE: channel is currently being used
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* @NL80211_SURVEY_INFO_CHANNEL_TIME: amount of time (in ms) that the radio
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* spent on this channel
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* @NL80211_SURVEY_INFO_CHANNEL_TIME_BUSY: amount of the time the primary
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* channel was sensed busy (either due to activity or energy detect)
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* @NL80211_SURVEY_INFO_CHANNEL_TIME_EXT_BUSY: amount of time the extension
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* channel was sensed busy
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* @NL80211_SURVEY_INFO_CHANNEL_TIME_RX: amount of time the radio spent
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* receiving data
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* @NL80211_SURVEY_INFO_CHANNEL_TIME_TX: amount of time the radio spent
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* transmitting data
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* @NL80211_SURVEY_INFO_MAX: highest survey info attribute number
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* currently defined
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* @__NL80211_SURVEY_INFO_AFTER_LAST: internal use
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*/
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static const char *const msg_names[NL80211_SURVEY_INFO_MAX + 1] = {
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[NL80211_SURVEY_INFO_FREQUENCY] = "frequency",
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[NL80211_SURVEY_INFO_CHANNEL_TIME] = "active",
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[NL80211_SURVEY_INFO_CHANNEL_TIME_BUSY] = "busy",
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[NL80211_SURVEY_INFO_CHANNEL_TIME_RX] = "rx",
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[NL80211_SURVEY_INFO_CHANNEL_TIME_TX] = "tx",
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[NL80211_SURVEY_INFO_NOISE] = "noise",
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};
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static int survey_airtime_handler(struct nl_msg *msg, void *arg) {
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struct json_object **result = arg;
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struct json_object *freq_json = NULL;
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struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
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struct nlattr *survey_info = nla_find(genlmsg_attrdata(gnlh, 0), genlmsg_attrlen(gnlh, 0), NL80211_ATTR_SURVEY_INFO);
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if (*result) {
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fprintf(stderr, "respondd-module-airtime: callback called again after NL_STOP\n");
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return NL_STOP;
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}
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if (!survey_info) {
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fprintf(stderr, "respondd-module-airtime: survey data missing in netlink message\n");
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return NL_STOP;
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}
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freq_json = json_object_new_object();
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if (!freq_json) {
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fprintf(stderr, "respondd-module-airtime: failed allocating JSON object\n");
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return NL_STOP;
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}
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// This variable counts the number of required attributes that are
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// found in the message and is afterwards checked against the number of
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// required attributes.
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unsigned int req_fields = 0;
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int rem;
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struct nlattr *nla;
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nla_for_each_nested(nla, survey_info, rem) {
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int type = nla_type(nla);
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if (type > NL80211_SURVEY_INFO_MAX)
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continue;
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switch (type) {
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// these are the required fields
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case NL80211_SURVEY_INFO_IN_USE:
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case NL80211_SURVEY_INFO_FREQUENCY:
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case NL80211_SURVEY_INFO_CHANNEL_TIME:
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req_fields++;
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}
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if (!msg_names[type])
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continue;
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struct json_object *data_json = NULL;
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switch (nla_len(nla)) {
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case sizeof(uint64_t):
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data_json = json_object_new_int64(nla_get_u64(nla));
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break;
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case sizeof(uint32_t):
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data_json = json_object_new_int(nla_get_u32(nla));
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break;
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case sizeof(uint8_t):
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if (type == NL80211_SURVEY_INFO_NOISE)
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data_json = json_object_new_int((int8_t)nla_get_u8(nla));
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else
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data_json = json_object_new_int(nla_get_u8(nla));
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break;
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default:
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fprintf(stderr, "respondd-module-airtime: Unexpected NL attribute length: %d\n", nla_len(nla));
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}
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if (data_json)
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json_object_object_add(freq_json, msg_names[type], data_json);
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}
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/* The kernel didn't report all required fields: continue with next
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* record, this entry was off-channel */
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if (req_fields != 3) {
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json_object_put(freq_json);
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return NL_OK;
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}
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*result = freq_json;
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return NL_STOP;
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}
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struct json_object * get_airtime(int ifx) {
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struct json_object *result = NULL;
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nl_send_dump(survey_airtime_handler, &result, NL80211_CMD_GET_SURVEY, ifx);
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return result;
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}
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