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// SPDX-License-Identifier: LGPL-2.1+
// Copyright (C) 2022, Linaro Ltd - Daniel Lezcano <daniel.lezcano@linaro.org>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <thermal.h>
#include "thermal_nl.h"
struct handler_args {
const char *group;
int id;
};
static __thread int err;
static __thread int done;
static int nl_seq_check_handler(struct nl_msg *msg, void *arg)
{
return NL_OK;
}
static int nl_error_handler(struct sockaddr_nl *nla, struct nlmsgerr *nl_err,
void *arg)
{
int *ret = arg;
if (ret)
*ret = nl_err->error;
return NL_STOP;
}
static int nl_finish_handler(struct nl_msg *msg, void *arg)
{
int *ret = arg;
if (ret)
*ret = 1;
return NL_OK;
}
static int nl_ack_handler(struct nl_msg *msg, void *arg)
{
int *ret = arg;
if (ret)
*ret = 1;
return NL_OK;
}
int nl_send_msg(struct nl_sock *sock, struct nl_cb *cb, struct nl_msg *msg,
int (*rx_handler)(struct nl_msg *, void *), void *data)
{
if (!rx_handler)
return THERMAL_ERROR;
err = nl_send_auto_complete(sock, msg);
if (err < 0)
return err;
nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM, rx_handler, data);
err = done = 0;
while (err == 0 && done == 0)
nl_recvmsgs(sock, cb);
return err;
}
static int nl_family_handler(struct nl_msg *msg, void *arg)
{
struct handler_args *grp = arg;
struct nlattr *tb[CTRL_ATTR_MAX + 1];
struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
struct nlattr *mcgrp;
int rem_mcgrp;
nla_parse(tb, CTRL_ATTR_MAX, genlmsg_attrdata(gnlh, 0),
genlmsg_attrlen(gnlh, 0), NULL);
if (!tb[CTRL_ATTR_MCAST_GROUPS])
return THERMAL_ERROR;
nla_for_each_nested(mcgrp, tb[CTRL_ATTR_MCAST_GROUPS], rem_mcgrp) {
struct nlattr *tb_mcgrp[CTRL_ATTR_MCAST_GRP_MAX + 1];
nla_parse(tb_mcgrp, CTRL_ATTR_MCAST_GRP_MAX,
nla_data(mcgrp), nla_len(mcgrp), NULL);
if (!tb_mcgrp[CTRL_ATTR_MCAST_GRP_NAME] ||
!tb_mcgrp[CTRL_ATTR_MCAST_GRP_ID])
continue;
if (strncmp(nla_data(tb_mcgrp[CTRL_ATTR_MCAST_GRP_NAME]),
grp->group,
nla_len(tb_mcgrp[CTRL_ATTR_MCAST_GRP_NAME])))
continue;
grp->id = nla_get_u32(tb_mcgrp[CTRL_ATTR_MCAST_GRP_ID]);
break;
}
return THERMAL_SUCCESS;
}
static int nl_get_multicast_id(struct nl_sock *sock, struct nl_cb *cb,
const char *family, const char *group)
{
struct nl_msg *msg;
int ret = 0, ctrlid;
struct handler_args grp = {
.group = group,
.id = -ENOENT,
};
msg = nlmsg_alloc();
if (!msg)
return THERMAL_ERROR;
ctrlid = genl_ctrl_resolve(sock, "nlctrl");
genlmsg_put(msg, 0, 0, ctrlid, 0, 0, CTRL_CMD_GETFAMILY, 0);
nla_put_string(msg, CTRL_ATTR_FAMILY_NAME, family);
ret = nl_send_msg(sock, cb, msg, nl_family_handler, &grp);
if (ret)
goto nla_put_failure;
ret = grp.id;
nla_put_failure:
nlmsg_free(msg);
return ret;
}
int nl_thermal_connect(struct nl_sock **nl_sock, struct nl_cb **nl_cb)
{
struct nl_cb *cb;
struct nl_sock *sock;
cb = nl_cb_alloc(NL_CB_DEFAULT);
if (!cb)
return THERMAL_ERROR;
sock = nl_socket_alloc();
if (!sock)
goto out_cb_free;
if (genl_connect(sock))
goto out_socket_free;
if (nl_cb_err(cb, NL_CB_CUSTOM, nl_error_handler, &err) ||
nl_cb_set(cb, NL_CB_FINISH, NL_CB_CUSTOM, nl_finish_handler, &done) ||
nl_cb_set(cb, NL_CB_ACK, NL_CB_CUSTOM, nl_ack_handler, &done) ||
nl_cb_set(cb, NL_CB_SEQ_CHECK, NL_CB_CUSTOM, nl_seq_check_handler, &done))
return THERMAL_ERROR;
*nl_sock = sock;
*nl_cb = cb;
return THERMAL_SUCCESS;
out_socket_free:
nl_socket_free(sock);
out_cb_free:
nl_cb_put(cb);
return THERMAL_ERROR;
}
void nl_thermal_disconnect(struct nl_sock *nl_sock, struct nl_cb *nl_cb)
{
nl_close(nl_sock);
nl_socket_free(nl_sock);
nl_cb_put(nl_cb);
}
int nl_unsubscribe_thermal(struct nl_sock *nl_sock, struct nl_cb *nl_cb,
const char *group)
{
int mcid;
mcid = nl_get_multicast_id(nl_sock, nl_cb, THERMAL_GENL_FAMILY_NAME,
group);
if (mcid < 0)
return THERMAL_ERROR;
if (nl_socket_drop_membership(nl_sock, mcid))
return THERMAL_ERROR;
return THERMAL_SUCCESS;
}
int nl_subscribe_thermal(struct nl_sock *nl_sock, struct nl_cb *nl_cb,
const char *group)
{
int mcid;
mcid = nl_get_multicast_id(nl_sock, nl_cb, THERMAL_GENL_FAMILY_NAME,
group);
if (mcid < 0)
return THERMAL_ERROR;
if (nl_socket_add_membership(nl_sock, mcid))
return THERMAL_ERROR;
return THERMAL_SUCCESS;
}
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