cregit-Linux how code gets into the kernel

Release 4.11 net/ieee802154/nl802154.c

Directory: net/ieee802154
/* This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2
 * as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * Authors:
 * Alexander Aring <aar@pengutronix.de>
 *
 * Based on: net/wireless/nl80211.c
 */

#include <linux/rtnetlink.h>

#include <net/cfg802154.h>
#include <net/genetlink.h>
#include <net/mac802154.h>
#include <net/netlink.h>
#include <net/nl802154.h>
#include <net/sock.h>

#include "nl802154.h"
#include "rdev-ops.h"
#include "core.h"

/* the netlink family */

static struct genl_family nl802154_fam;

/* multicast groups */

enum nl802154_multicast_groups {
	
NL802154_MCGRP_CONFIG,
};


static const struct genl_multicast_group nl802154_mcgrps[] = {
	[NL802154_MCGRP_CONFIG] = { .name = "config", },
};

/* returns ERR_PTR values */


static struct wpan_dev *

__cfg802154_wpan_dev_from_attrs(struct net *netns, struct nlattr **attrs)
{
	struct cfg802154_registered_device *rdev;
	struct wpan_dev *result = NULL;
	bool have_ifidx = attrs[NL802154_ATTR_IFINDEX];
	bool have_wpan_dev_id = attrs[NL802154_ATTR_WPAN_DEV];
	u64 wpan_dev_id;
	int wpan_phy_idx = -1;
	int ifidx = -1;

	ASSERT_RTNL();

	if (!have_ifidx && !have_wpan_dev_id)
		return ERR_PTR(-EINVAL);

	if (have_ifidx)
		ifidx = nla_get_u32(attrs[NL802154_ATTR_IFINDEX]);
	if (have_wpan_dev_id) {
		wpan_dev_id = nla_get_u64(attrs[NL802154_ATTR_WPAN_DEV]);
		wpan_phy_idx = wpan_dev_id >> 32;
	}

	list_for_each_entry(rdev, &cfg802154_rdev_list, list) {
		struct wpan_dev *wpan_dev;

		if (wpan_phy_net(&rdev->wpan_phy) != netns)
			continue;

		if (have_wpan_dev_id && rdev->wpan_phy_idx != wpan_phy_idx)
			continue;

		list_for_each_entry(wpan_dev, &rdev->wpan_dev_list, list) {
			if (have_ifidx && wpan_dev->netdev &&
			    wpan_dev->netdev->ifindex == ifidx) {
				result = wpan_dev;
				break;
			}
			if (have_wpan_dev_id &&
			    wpan_dev->identifier == (u32)wpan_dev_id) {
				result = wpan_dev;
				break;
			}
		}

		if (result)
			break;
	}

	if (result)
		return result;

	return ERR_PTR(-ENODEV);
}


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static struct cfg802154_registered_device *

__cfg802154_rdev_from_attrs(struct net *netns, struct nlattr **attrs)
{
	struct cfg802154_registered_device *rdev = NULL, *tmp;
	struct net_device *netdev;

	ASSERT_RTNL();

	if (!attrs[NL802154_ATTR_WPAN_PHY] &&
	    !attrs[NL802154_ATTR_IFINDEX] &&
	    !attrs[NL802154_ATTR_WPAN_DEV])
		return ERR_PTR(-EINVAL);

	if (attrs[NL802154_ATTR_WPAN_PHY])
		rdev = cfg802154_rdev_by_wpan_phy_idx(
				nla_get_u32(attrs[NL802154_ATTR_WPAN_PHY]));

	if (attrs[NL802154_ATTR_WPAN_DEV]) {
		u64 wpan_dev_id = nla_get_u64(attrs[NL802154_ATTR_WPAN_DEV]);
		struct wpan_dev *wpan_dev;
		bool found = false;

		tmp = cfg802154_rdev_by_wpan_phy_idx(wpan_dev_id >> 32);
		if (tmp) {
			/* make sure wpan_dev exists */
			list_for_each_entry(wpan_dev, &tmp->wpan_dev_list, list) {
				if (wpan_dev->identifier != (u32)wpan_dev_id)
					continue;
				found = true;
				break;
			}

			if (!found)
				tmp = NULL;

			if (rdev && tmp != rdev)
				return ERR_PTR(-EINVAL);
			rdev = tmp;
		}
	}

	if (attrs[NL802154_ATTR_IFINDEX]) {
		int ifindex = nla_get_u32(attrs[NL802154_ATTR_IFINDEX]);

		netdev = __dev_get_by_index(netns, ifindex);
		if (netdev) {
			if (netdev->ieee802154_ptr)
				tmp = wpan_phy_to_rdev(
						netdev->ieee802154_ptr->wpan_phy);
			else
				tmp = NULL;

			/* not wireless device -- return error */
			if (!tmp)
				return ERR_PTR(-EINVAL);

			/* mismatch -- return error */
			if (rdev && tmp != rdev)
				return ERR_PTR(-EINVAL);

			rdev = tmp;
		}
	}

	if (!rdev)
		return ERR_PTR(-ENODEV);

	if (netns != wpan_phy_net(&rdev->wpan_phy))
		return ERR_PTR(-ENODEV);

	return rdev;
}


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/* This function returns a pointer to the driver
 * that the genl_info item that is passed refers to.
 *
 * The result of this can be a PTR_ERR and hence must
 * be checked with IS_ERR() for errors.
 */


static struct cfg802154_registered_device *

cfg802154_get_dev_from_info(struct net *netns, struct genl_info *info)
{
	return __cfg802154_rdev_from_attrs(netns, info->attrs);
}


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/* policy for the attributes */

static const struct nla_policy nl802154_policy[NL802154_ATTR_MAX+1] = {
	[NL802154_ATTR_WPAN_PHY] = { .type = NLA_U32 },
	[NL802154_ATTR_WPAN_PHY_NAME] = { .type = NLA_NUL_STRING,
					  .len = 20-1 },

	[NL802154_ATTR_IFINDEX] = { .type = NLA_U32 },
	[NL802154_ATTR_IFTYPE] = { .type = NLA_U32 },
	[NL802154_ATTR_IFNAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ-1 },

	[NL802154_ATTR_WPAN_DEV] = { .type = NLA_U64 },

	[NL802154_ATTR_PAGE] = { .type = NLA_U8, },
	[NL802154_ATTR_CHANNEL] = { .type = NLA_U8, },

	[NL802154_ATTR_TX_POWER] = { .type = NLA_S32, },

	[NL802154_ATTR_CCA_MODE] = { .type = NLA_U32, },
	[NL802154_ATTR_CCA_OPT] = { .type = NLA_U32, },
	[NL802154_ATTR_CCA_ED_LEVEL] = { .type = NLA_S32, },

	[NL802154_ATTR_SUPPORTED_CHANNEL] = { .type = NLA_U32, },

	[NL802154_ATTR_PAN_ID] = { .type = NLA_U16, },
	[NL802154_ATTR_EXTENDED_ADDR] = { .type = NLA_U64 },
	[NL802154_ATTR_SHORT_ADDR] = { .type = NLA_U16, },

	[NL802154_ATTR_MIN_BE] = { .type = NLA_U8, },
	[NL802154_ATTR_MAX_BE] = { .type = NLA_U8, },
	[NL802154_ATTR_MAX_CSMA_BACKOFFS] = { .type = NLA_U8, },

	[NL802154_ATTR_MAX_FRAME_RETRIES] = { .type = NLA_S8, },

	[NL802154_ATTR_LBT_MODE] = { .type = NLA_U8, },

	[NL802154_ATTR_WPAN_PHY_CAPS] = { .type = NLA_NESTED },

	[NL802154_ATTR_SUPPORTED_COMMANDS] = { .type = NLA_NESTED },

	[NL802154_ATTR_ACKREQ_DEFAULT] = { .type = NLA_U8 },

	[NL802154_ATTR_PID] = { .type = NLA_U32 },
	[NL802154_ATTR_NETNS_FD] = { .type = NLA_U32 },
#ifdef CONFIG_IEEE802154_NL802154_EXPERIMENTAL
	[NL802154_ATTR_SEC_ENABLED] = { .type = NLA_U8, },
	[NL802154_ATTR_SEC_OUT_LEVEL] = { .type = NLA_U32, },
	[NL802154_ATTR_SEC_OUT_KEY_ID] = { .type = NLA_NESTED, },
	[NL802154_ATTR_SEC_FRAME_COUNTER] = { .type = NLA_U32 },

	[NL802154_ATTR_SEC_LEVEL] = { .type = NLA_NESTED },
	[NL802154_ATTR_SEC_DEVICE] = { .type = NLA_NESTED },
	[NL802154_ATTR_SEC_DEVKEY] = { .type = NLA_NESTED },
	[NL802154_ATTR_SEC_KEY] = { .type = NLA_NESTED },
#endif /* CONFIG_IEEE802154_NL802154_EXPERIMENTAL */
};

#ifdef CONFIG_IEEE802154_NL802154_EXPERIMENTAL


static int

nl802154_prepare_wpan_dev_dump(struct sk_buff *skb,
			       struct netlink_callback *cb,
			       struct cfg802154_registered_device **rdev,
			       struct wpan_dev **wpan_dev)
{
	int err;

	rtnl_lock();

	if (!cb->args[0]) {
		err = nlmsg_parse(cb->nlh, GENL_HDRLEN + nl802154_fam.hdrsize,
				  genl_family_attrbuf(&nl802154_fam),
				  nl802154_fam.maxattr,
				  nl802154_policy);
		if (err)
			goto out_unlock;

		*wpan_dev = __cfg802154_wpan_dev_from_attrs(sock_net(skb->sk),
							    genl_family_attrbuf(&nl802154_fam));
		if (IS_ERR(*wpan_dev)) {
			err = PTR_ERR(*wpan_dev);
			goto out_unlock;
		}
		*rdev = wpan_phy_to_rdev((*wpan_dev)->wpan_phy);
		/* 0 is the first index - add 1 to parse only once */
		cb->args[0] = (*rdev)->wpan_phy_idx + 1;
		cb->args[1] = (*wpan_dev)->identifier;
	} else {
		/* subtract the 1 again here */
		struct wpan_phy *wpan_phy = wpan_phy_idx_to_wpan_phy(cb->args[0] - 1);
		struct wpan_dev *tmp;

		if (!wpan_phy) {
			err = -ENODEV;
			goto out_unlock;
		}
		*rdev = wpan_phy_to_rdev(wpan_phy);
		*wpan_dev = NULL;

		list_for_each_entry(tmp, &(*rdev)->wpan_dev_list, list) {
			if (tmp->identifier == cb->args[1]) {
				*wpan_dev = tmp;
				break;
			}
		}

		if (!*wpan_dev) {
			err = -ENODEV;
			goto out_unlock;
		}
	}

	return 0;
 out_unlock:
	rtnl_unlock();
	return err;
}


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static void

nl802154_finish_wpan_dev_dump(struct cfg802154_registered_device *rdev)
{
	rtnl_unlock();
}

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#endif /* CONFIG_IEEE802154_NL802154_EXPERIMENTAL */

/* message building helper */



static inline void *nl802154hdr_put(struct sk_buff *skb, u32 portid, u32 seq,
				    int flags, u8 cmd)
{
	/* since there is no private header just add the generic one */
	return genlmsg_put(skb, portid, seq, &nl802154_fam, flags, cmd);
}


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static int

nl802154_put_flags(struct sk_buff *msg, int attr, u32 mask)
{
	struct nlattr *nl_flags = nla_nest_start(msg, attr);
	int i;

	if (!nl_flags)
		return -ENOBUFS;

	i = 0;
	while (mask) {
		if ((mask & 1) && nla_put_flag(msg, i))
			return -ENOBUFS;

		mask >>= 1;
		i++;
	}

	nla_nest_end(msg, nl_flags);
	return 0;
}


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static int

nl802154_send_wpan_phy_channels(struct cfg802154_registered_device *rdev,
				struct sk_buff *msg)
{
	struct nlattr *nl_page;
	unsigned long page;

	nl_page = nla_nest_start(msg, NL802154_ATTR_CHANNELS_SUPPORTED);
	if (!nl_page)
		return -ENOBUFS;

	for (page = 0; page <= IEEE802154_MAX_PAGE; page++) {
		if (nla_put_u32(msg, NL802154_ATTR_SUPPORTED_CHANNEL,
				rdev->wpan_phy.supported.channels[page]))
			return -ENOBUFS;
	}
	nla_nest_end(msg, nl_page);

	return 0;
}


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static int

nl802154_put_capabilities(struct sk_buff *msg,
			  struct cfg802154_registered_device *rdev)
{
	const struct wpan_phy_supported *caps = &rdev->wpan_phy.supported;
	struct nlattr *nl_caps, *nl_channels;
	int i;

	nl_caps = nla_nest_start(msg, NL802154_ATTR_WPAN_PHY_CAPS);
	if (!nl_caps)
		return -ENOBUFS;

	nl_channels = nla_nest_start(msg, NL802154_CAP_ATTR_CHANNELS);
	if (!nl_channels)
		return -ENOBUFS;

	for (i = 0; i <= IEEE802154_MAX_PAGE; i++) {
		if (caps->channels[i]) {
			if (nl802154_put_flags(msg, i, caps->channels[i]))
				return -ENOBUFS;
		}
	}

	nla_nest_end(msg, nl_channels);

	if (rdev->wpan_phy.flags & WPAN_PHY_FLAG_CCA_ED_LEVEL) {
		struct nlattr *nl_ed_lvls;

		nl_ed_lvls = nla_nest_start(msg,
					    NL802154_CAP_ATTR_CCA_ED_LEVELS);
		if (!nl_ed_lvls)
			return -ENOBUFS;

		for (i = 0; i < caps->cca_ed_levels_size; i++) {
			if (nla_put_s32(msg, i, caps->cca_ed_levels[i]))
				return -ENOBUFS;
		}

		nla_nest_end(msg, nl_ed_lvls);
	}

	if (rdev->wpan_phy.flags & WPAN_PHY_FLAG_TXPOWER) {
		struct nlattr *nl_tx_pwrs;

		nl_tx_pwrs = nla_nest_start(msg, NL802154_CAP_ATTR_TX_POWERS);
		if (!nl_tx_pwrs)
			return -ENOBUFS;

		for (i = 0; i < caps->tx_powers_size; i++) {
			if (nla_put_s32(msg, i, caps->tx_powers[i]))
				return -ENOBUFS;
		}

		nla_nest_end(msg, nl_tx_pwrs);
	}

	if (rdev->wpan_phy.flags & WPAN_PHY_FLAG_CCA_MODE) {
		if (nl802154_put_flags(msg, NL802154_CAP_ATTR_CCA_MODES,
				       caps->cca_modes) ||
		    nl802154_put_flags(msg, NL802154_CAP_ATTR_CCA_OPTS,
				       caps->cca_opts))
			return -ENOBUFS;
	}

	if (nla_put_u8(msg, NL802154_CAP_ATTR_MIN_MINBE, caps->min_minbe) ||
	    nla_put_u8(msg, NL802154_CAP_ATTR_MAX_MINBE, caps->max_minbe) ||
	    nla_put_u8(msg, NL802154_CAP_ATTR_MIN_MAXBE, caps->min_maxbe) ||
	    nla_put_u8(msg, NL802154_CAP_ATTR_MAX_MAXBE, caps->max_maxbe) ||
	    nla_put_u8(msg, NL802154_CAP_ATTR_MIN_CSMA_BACKOFFS,
		       caps->min_csma_backoffs) ||
	    nla_put_u8(msg, NL802154_CAP_ATTR_MAX_CSMA_BACKOFFS,
		       caps->max_csma_backoffs) ||
	    nla_put_s8(msg, NL802154_CAP_ATTR_MIN_FRAME_RETRIES,
		       caps->min_frame_retries) ||
	    nla_put_s8(msg, NL802154_CAP_ATTR_MAX_FRAME_RETRIES,
		       caps->max_frame_retries) ||
	    nl802154_put_flags(msg, NL802154_CAP_ATTR_IFTYPES,
			       caps->iftypes) ||
	    nla_put_u32(msg, NL802154_CAP_ATTR_LBT, caps->lbt))
		return -ENOBUFS;

	nla_nest_end(msg, nl_caps);

	return 0;
}


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static int nl802154_send_wpan_phy(struct cfg802154_registered_device *rdev,
				  enum nl802154_commands cmd,
				  struct sk_buff *msg, u32 portid, u32 seq,
				  int flags)
{
	struct nlattr *nl_cmds;
	void *hdr;
	int i;

	hdr = nl802154hdr_put(msg, portid, seq, flags, cmd);
	if (!hdr)
		return -ENOBUFS;

	if (nla_put_u32(msg, NL802154_ATTR_WPAN_PHY, rdev->wpan_phy_idx) ||
	    nla_put_string(msg, NL802154_ATTR_WPAN_PHY_NAME,
			   wpan_phy_name(&rdev->wpan_phy)) ||
	    nla_put_u32(msg, NL802154_ATTR_GENERATION,
			cfg802154_rdev_list_generation))
		goto nla_put_failure;

	if (cmd != NL802154_CMD_NEW_WPAN_PHY)
		goto finish;

	/* DUMP PHY PIB */

	/* current channel settings */
	if (nla_put_u8(msg, NL802154_ATTR_PAGE,
		       rdev->wpan_phy.current_page) ||
	    nla_put_u8(msg, NL802154_ATTR_CHANNEL,
		       rdev->wpan_phy.current_channel))
		goto nla_put_failure;

	/* TODO remove this behaviour, we still keep support it for a while
         * so users can change the behaviour to the new one.
         */
	if (nl802154_send_wpan_phy_channels(rdev, msg))
		goto nla_put_failure;

	/* cca mode */
	if (rdev->wpan_phy.flags & WPAN_PHY_FLAG_CCA_MODE) {
		if (nla_put_u32(msg, NL802154_ATTR_CCA_MODE,
				rdev->wpan_phy.cca.mode))
			goto nla_put_failure;

		if (rdev->wpan_phy.cca.mode == NL802154_CCA_ENERGY_CARRIER) {
			if (nla_put_u32(msg, NL802154_ATTR_CCA_OPT,
					rdev->wpan_phy.cca.opt))
				goto nla_put_failure;
		}
	}

	if (rdev->wpan_phy.flags & WPAN_PHY_FLAG_TXPOWER) {
		if (nla_put_s32(msg, NL802154_ATTR_TX_POWER,
				rdev->wpan_phy.transmit_power))
			goto nla_put_failure;
	}

	if (rdev->wpan_phy.flags & WPAN_PHY_FLAG_CCA_ED_LEVEL) {
		if (nla_put_s32(msg, NL802154_ATTR_CCA_ED_LEVEL,
				rdev->wpan_phy.cca_ed_level))
			goto nla_put_failure;
	}

	if (nl802154_put_capabilities(msg, rdev))
		goto nla_put_failure;

	nl_cmds = nla_nest_start(msg, NL802154_ATTR_SUPPORTED_COMMANDS);
	if (!nl_cmds)
		goto nla_put_failure;

	i = 0;

#define CMD(op, n)							\
	do {                                                            \
                if (rdev->ops->op) {                                    \
                        i++;                                            \
                        if (nla_put_u32(msg, i, NL802154_CMD_ ## n))    \
                                goto nla_put_failure;                   \
                }                                                       \
        } while (0)

	CMD(add_virtual_intf, NEW_INTERFACE);
	CMD(del_virtual_intf, DEL_INTERFACE);
	CMD(set_channel, SET_CHANNEL);
	CMD(set_pan_id, SET_PAN_ID);
	CMD(set_short_addr, SET_SHORT_ADDR);
	CMD(set_backoff_exponent, SET_BACKOFF_EXPONENT);
	CMD(set_max_csma_backoffs, SET_MAX_CSMA_BACKOFFS);
	CMD(set_max_frame_retries, SET_MAX_FRAME_RETRIES);
	CMD(set_lbt_mode, SET_LBT_MODE);
	CMD(set_ackreq_default, SET_ACKREQ_DEFAULT);

	if (rdev->wpan_phy.flags & WPAN_PHY_FLAG_TXPOWER)
		CMD(set_tx_power, SET_TX_POWER);

	if (rdev->wpan_phy.flags & WPAN_PHY_FLAG_CCA_ED_LEVEL)
		CMD(set_cca_ed_level, SET_CCA_ED_LEVEL);

	if (rdev->wpan_phy.flags & WPAN_PHY_FLAG_CCA_MODE)
		CMD(set_cca_mode, SET_CCA_MODE);


#undef CMD
	nla_nest_end(msg, nl_cmds);

finish:
	genlmsg_end(msg, hdr);
	return 0;

nla_put_failure:
	genlmsg_cancel(msg, hdr);
	return -EMSGSIZE;
}


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struct nl802154_dump_wpan_phy_state {
	
s64 filter_wpan_phy;
	
long start;

};




static int nl802154_dump_wpan_phy_parse(struct sk_buff *skb,
					struct netlink_callback *cb,
					struct nl802154_dump_wpan_phy_state *state)
{
	struct nlattr **tb = genl_family_attrbuf(&nl802154_fam);
	int ret = nlmsg_parse(cb->nlh, GENL_HDRLEN + nl802154_fam.hdrsize,
			      tb, nl802154_fam.maxattr, nl802154_policy);

	/* TODO check if we can handle error here,
         * we have no backward compatibility
         */
	if (ret)
		return 0;

	if (tb[NL802154_ATTR_WPAN_PHY])
		state->filter_wpan_phy = nla_get_u32(tb[NL802154_ATTR_WPAN_PHY]);
	if (tb[NL802154_ATTR_WPAN_DEV])
		state->filter_wpan_phy = nla_get_u64(tb[NL802154_ATTR_WPAN_DEV]) >> 32;
	if (tb[NL802154_ATTR_IFINDEX]) {
		struct net_device *netdev;
		struct cfg802154_registered_device *rdev;
		int ifidx = nla_get_u32(tb[NL802154_ATTR_IFINDEX]);

		netdev = __dev_get_by_index(&init_net, ifidx);
		if (!netdev)
			return -ENODEV;
		if (netdev->ieee802154_ptr) {
			rdev = wpan_phy_to_rdev(
					netdev->ieee802154_ptr->wpan_phy);
			state->filter_wpan_phy = rdev->wpan_phy_idx;
		}
	}

	return 0;
}


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static int

nl802154_dump_wpan_phy(struct sk_buff *skb, struct netlink_callback *cb)
{
	int idx = 0, ret;
	struct nl802154_dump_wpan_phy_state *state = (void *)cb->args[0];
	struct cfg802154_registered_device *rdev;

	rtnl_lock();
	if (!state) {
		state = kzalloc(sizeof(*state), GFP_KERNEL);
		if (!state) {
			rtnl_unlock();
			return -ENOMEM;
		}
		state->filter_wpan_phy = -1;
		ret = nl802154_dump_wpan_phy_parse(skb, cb, state);
		if (ret) {
			kfree(state);
			rtnl_unlock();
			return ret;
		}
		cb->args[0] = (long)state;
	}

	list_for_each_entry(rdev, &cfg802154_rdev_list, list) {
		if (!net_eq(wpan_phy_net(&rdev->wpan_phy), sock_net(skb->sk)))
			continue;
		if (++idx <= state->start)
			continue;
		if (state->filter_wpan_phy != -1 &&
		    state->filter_wpan_phy != rdev->wpan_phy_idx)
			continue;
		/* attempt to fit multiple wpan_phy data chunks into the skb */
		ret = nl802154_send_wpan_phy(rdev,
					     NL802154_CMD_NEW_WPAN_PHY,
					     skb,
					     NETLINK_CB(cb->skb).portid,
					     cb->nlh->nlmsg_seq, NLM_F_MULTI);
		if (ret < 0) {
			if ((ret == -ENOBUFS || ret == -EMSGSIZE) &&
			    !skb->len && cb->min_dump_alloc < 4096) {
				cb->min_dump_alloc = 4096;
				rtnl_unlock();
				return 1;
			}
			idx--;
			break;
		}
		break;
	}
	rtnl_unlock();

	state->start = idx;

	return skb->len;
}


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static int nl802154_dump_wpan_phy_done(struct netlink_callback *cb)
{
	kfree((void *)cb->args[0]);
	return 0;
}


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static int nl802154_get_wpan_phy(struct sk_buff *skb, struct genl_info *info)
{
	struct sk_buff *msg;
	struct cfg802154_registered_device *rdev = info->user_ptr[0];

	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
	if (!msg)
		return -ENOMEM;

	if (nl802154_send_wpan_phy(rdev, NL802154_CMD_NEW_WPAN_PHY, msg,
				   info->snd_portid, info->snd_seq, 0) < 0) {
		nlmsg_free(msg);
		return -ENOBUFS;
	}

	return genlmsg_reply(msg, info);
}


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static inline u64 wpan_dev_id(struct wpan_dev