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/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* Copyright (C) 2018 Red Hat, Inc.
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*/
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#include "src/core/nm-default-daemon.h"
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#include "nm-wpan-utils.h"
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#include <linux/if.h>
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#include "nm-platform/nm-netlink.h"
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#include "platform/linux/nl802154.h"
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#include "nm-platform/nm-platform-utils.h"
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#define _NMLOG_PREFIX_NAME "wpan-nl802154"
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#define _NMLOG(level, domain, ...) \
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G_STMT_START \
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{ \
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char _ifname_buf[IFNAMSIZ]; \
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const char *_ifname = self ? nmp_utils_if_indextoname(self->ifindex, _ifname_buf) : NULL; \
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\
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nm_log((level), \
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(domain), \
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_ifname ?: NULL, \
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NULL, \
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"%s%s%s%s: " _NM_UTILS_MACRO_FIRST(__VA_ARGS__), \
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_NMLOG_PREFIX_NAME, \
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NM_PRINT_FMT_QUOTED(_ifname, " (", _ifname, ")", "") \
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_NM_UTILS_MACRO_REST(__VA_ARGS__)); \
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} \
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G_STMT_END
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/*****************************************************************************/
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struct NMWpanUtils {
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GObject parent;
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int ifindex;
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struct nl_sock *nl_sock;
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int id;
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};
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typedef struct {
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GObjectClass parent;
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} NMWpanUtilsClass;
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G_DEFINE_TYPE(NMWpanUtils, nm_wpan_utils, G_TYPE_OBJECT)
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/*****************************************************************************/
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static int
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ack_handler(struct nl_msg *msg, void *arg)
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{
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int *done = arg;
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*done = 1;
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return NL_STOP;
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}
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static int
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finish_handler(struct nl_msg *msg, void *arg)
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{
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int *done = arg;
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*done = 1;
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return NL_SKIP;
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}
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static int
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error_handler(struct sockaddr_nl *nla, struct nlmsgerr *err, void *arg)
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{
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int *done = arg;
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*done = err->error;
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return NL_SKIP;
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}
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static struct nl_msg *
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_nl802154_alloc_msg(int id, int ifindex, guint32 cmd, guint32 flags)
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{
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nm_auto_nlmsg struct nl_msg *msg = NULL;
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msg = nlmsg_alloc();
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genlmsg_put(msg, 0, 0, id, 0, flags, cmd, 0);
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NLA_PUT_U32(msg, NL802154_ATTR_IFINDEX, ifindex);
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return g_steal_pointer(&msg;;
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nla_put_failure:
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g_return_val_if_reached(NULL);
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}
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static struct nl_msg *
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nl802154_alloc_msg(NMWpanUtils *self, guint32 cmd, guint32 flags)
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{
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return _nl802154_alloc_msg(self->id, self->ifindex, cmd, flags);
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}
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static int
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nl802154_send_and_recv(NMWpanUtils * self,
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struct nl_msg *msg,
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int (*valid_handler)(struct nl_msg *, void *),
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void *valid_data)
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{
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int err;
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int done = 0;
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const struct nl_cb cb = {
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.err_cb = error_handler,
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.err_arg = &done,
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.finish_cb = finish_handler,
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.finish_arg = &done,
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.ack_cb = ack_handler,
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.ack_arg = &done,
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.valid_cb = valid_handler,
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.valid_arg = valid_data,
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};
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g_return_val_if_fail(msg != NULL, -ENOMEM);
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err = nl_send_auto(self->nl_sock, msg);
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if (err < 0)
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return err;
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/* Loop until one of our NL callbacks says we're done; on success
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* done will be 1, on error it will be < 0.
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*/
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while (!done) {
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err = nl_recvmsgs(self->nl_sock, &cb;;
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if (err < 0 && err != -EAGAIN) {
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_LOGW(LOGD_PLATFORM, "nl_recvmsgs() error: (%d) %s", err, nm_strerror(err));
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break;
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}
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}
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if (err >= 0 && done < 0)
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err = done;
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return err;
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}
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struct nl802154_interface {
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guint16 pan_id;
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guint16 short_addr;
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gboolean valid;
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};
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static int
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nl802154_get_interface_handler(struct nl_msg *msg, void *arg)
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{
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static const struct nla_policy nl802154_policy[] = {
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[NL802154_ATTR_PAN_ID] = {.type = NLA_U16},
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[NL802154_ATTR_SHORT_ADDR] = {.type = NLA_U16},
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};
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struct nlattr * tb[G_N_ELEMENTS(nl802154_policy)];
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struct nl802154_interface *info = arg;
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struct genlmsghdr * gnlh = nlmsg_data(nlmsg_hdr(msg));
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if (nla_parse_arr(tb, genlmsg_attrdata(gnlh, 0), genlmsg_attrlen(gnlh, 0), nl802154_policy) < 0)
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return NL_SKIP;
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if (tb[NL802154_ATTR_PAN_ID])
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info->pan_id = le16toh(nla_get_u16(tb[NL802154_ATTR_PAN_ID]));
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if (tb[NL802154_ATTR_SHORT_ADDR])
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info->short_addr = le16toh(nla_get_u16(tb[NL802154_ATTR_SHORT_ADDR]));
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info->valid = TRUE;
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return NL_SKIP;
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}
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static void
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nl802154_get_interface(NMWpanUtils *self, struct nl802154_interface *interface)
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{
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nm_auto_nlmsg struct nl_msg *msg = NULL;
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memset(interface, 0, sizeof(*interface));
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msg = nl802154_alloc_msg(self, NL802154_CMD_GET_INTERFACE, 0);
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nl802154_send_and_recv(self, msg, nl802154_get_interface_handler, interface);
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}
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/*****************************************************************************/
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guint16
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nm_wpan_utils_get_pan_id(NMWpanUtils *self)
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{
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struct nl802154_interface interface;
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nl802154_get_interface(self, &interface);
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return interface.pan_id;
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}
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gboolean
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nm_wpan_utils_set_pan_id(NMWpanUtils *self, guint16 pan_id)
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{
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nm_auto_nlmsg struct nl_msg *msg = NULL;
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int err;
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g_return_val_if_fail(self != NULL, FALSE);
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msg = nl802154_alloc_msg(self, NL802154_CMD_SET_PAN_ID, 0);
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NLA_PUT_U16(msg, NL802154_ATTR_PAN_ID, htole16(pan_id));
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err = nl802154_send_and_recv(self, msg, NULL, NULL);
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return err >= 0;
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nla_put_failure:
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g_return_val_if_reached(FALSE);
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}
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guint16
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nm_wpan_utils_get_short_addr(NMWpanUtils *self)
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{
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struct nl802154_interface interface;
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nl802154_get_interface(self, &interface);
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return interface.short_addr;
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}
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gboolean
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nm_wpan_utils_set_short_addr(NMWpanUtils *self, guint16 short_addr)
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{
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nm_auto_nlmsg struct nl_msg *msg = NULL;
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int err;
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g_return_val_if_fail(self != NULL, FALSE);
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msg = nl802154_alloc_msg(self, NL802154_CMD_SET_SHORT_ADDR, 0);
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NLA_PUT_U16(msg, NL802154_ATTR_SHORT_ADDR, htole16(short_addr));
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err = nl802154_send_and_recv(self, msg, NULL, NULL);
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return err >= 0;
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nla_put_failure:
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g_return_val_if_reached(FALSE);
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}
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gboolean
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nm_wpan_utils_set_channel(NMWpanUtils *self, guint8 page, guint8 channel)
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{
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nm_auto_nlmsg struct nl_msg *msg = NULL;
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int err;
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g_return_val_if_fail(self != NULL, FALSE);
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msg = nl802154_alloc_msg(self, NL802154_CMD_SET_CHANNEL, 0);
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NLA_PUT_U8(msg, NL802154_ATTR_PAGE, page);
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NLA_PUT_U8(msg, NL802154_ATTR_CHANNEL, channel);
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err = nl802154_send_and_recv(self, msg, NULL, NULL);
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return err >= 0;
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nla_put_failure:
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g_return_val_if_reached(FALSE);
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}
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/*****************************************************************************/
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static void
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nm_wpan_utils_init(NMWpanUtils *self)
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{}
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static void
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nm_wpan_utils_class_init(NMWpanUtilsClass *klass)
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{}
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NMWpanUtils *
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nm_wpan_utils_new(int ifindex, struct nl_sock *genl, gboolean check_scan)
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{
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NMWpanUtils *self;
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g_return_val_if_fail(ifindex > 0, NULL);
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if (!genl)
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return NULL;
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self = g_object_new(NM_TYPE_WPAN_UTILS, NULL);
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self->ifindex = ifindex;
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self->nl_sock = genl;
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self->id = genl_ctrl_resolve(genl, "nl802154");
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if (self->id < 0) {
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_LOGD(LOGD_PLATFORM, "genl_ctrl_resolve: failed to resolve \"nl802154\"");
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g_object_unref(self);
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return NULL;
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}
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return self;
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}
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