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