// SPDX-License-Identifier: GPL-2.0-only
/*
 * Netlink interface for IEEE 802.15.4 stack
 *
 * Copyright 2007, 2008 Siemens AG
 *
 * Written by:
 * Sergey Lapin <slapin@ossfans.org>
 * Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
 * Maxim Osipov <maxim.osipov@siemens.com>
 */

#include <linux/kernel.h>
#include <linux/gfp.h>
#include <net/genetlink.h>
#include <linux/nl802154.h>

#include "ieee802154.h"

static unsigned int ieee802154_seq_num;
static DEFINE_SPINLOCK(ieee802154_seq_lock);

/* Requests to userspace */
struct sk_buff *ieee802154_nl_create(int flags, u8 req)
{
        void *hdr;
        struct sk_buff *msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
        unsigned long f;

        if (!msg)
                return NULL;

        spin_lock_irqsave(&ieee802154_seq_lock, f);
        hdr = genlmsg_put(msg, 0, ieee802154_seq_num++,
                          &nl802154_family, flags, req);
        spin_unlock_irqrestore(&ieee802154_seq_lock, f);
        if (!hdr) {
                nlmsg_free(msg);
                return NULL;
        }

        return msg;
}

int ieee802154_nl_mcast(struct sk_buff *msg, unsigned int group)
{
        struct nlmsghdr *nlh = nlmsg_hdr(msg);
        void *hdr = genlmsg_data(nlmsg_data(nlh));

        genlmsg_end(msg, hdr);

        return genlmsg_multicast(&nl802154_family, msg, 0, group, GFP_ATOMIC);
}

struct sk_buff *ieee802154_nl_new_reply(struct genl_info *info,
                                        int flags, u8 req)
{
        void *hdr;
        struct sk_buff *msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);

        if (!msg)
                return NULL;

        hdr = genlmsg_put_reply(msg, info,
                                &nl802154_family, flags, req);
        if (!hdr) {
                nlmsg_free(msg);
                return NULL;
        }

        return msg;
}

int ieee802154_nl_reply(struct sk_buff *msg, struct genl_info *info)
{
        struct nlmsghdr *nlh = nlmsg_hdr(msg);
        void *hdr = genlmsg_data(nlmsg_data(nlh));

        genlmsg_end(msg, hdr);

        return genlmsg_reply(msg, info);
}

static const struct genl_small_ops ieee802154_ops[] = {
        /* see nl-phy.c */
        IEEE802154_DUMP(IEEE802154_LIST_PHY, ieee802154_list_phy,
                        ieee802154_dump_phy),
        IEEE802154_OP(IEEE802154_ADD_IFACE, ieee802154_add_iface),
        IEEE802154_OP(IEEE802154_DEL_IFACE, ieee802154_del_iface),
        /* see nl-mac.c */
        IEEE802154_OP(IEEE802154_ASSOCIATE_REQ, ieee802154_associate_req),
        IEEE802154_OP(IEEE802154_ASSOCIATE_RESP, ieee802154_associate_resp),
        IEEE802154_OP(IEEE802154_DISASSOCIATE_REQ, ieee802154_disassociate_req),
        IEEE802154_OP(IEEE802154_SCAN_REQ, ieee802154_scan_req),
        IEEE802154_OP(IEEE802154_START_REQ, ieee802154_start_req),
        IEEE802154_DUMP(IEEE802154_LIST_IFACE, ieee802154_list_iface,
                        ieee802154_dump_iface),
        IEEE802154_OP(IEEE802154_SET_MACPARAMS, ieee802154_set_macparams),
        IEEE802154_OP(IEEE802154_LLSEC_GETPARAMS, ieee802154_llsec_getparams),
        IEEE802154_OP(IEEE802154_LLSEC_SETPARAMS, ieee802154_llsec_setparams),
        IEEE802154_DUMP(IEEE802154_LLSEC_LIST_KEY, NULL,
                        ieee802154_llsec_dump_keys),
        IEEE802154_OP(IEEE802154_LLSEC_ADD_KEY, ieee802154_llsec_add_key),
        IEEE802154_OP(IEEE802154_LLSEC_DEL_KEY, ieee802154_llsec_del_key),
        IEEE802154_DUMP(IEEE802154_LLSEC_LIST_DEV, NULL,
                        ieee802154_llsec_dump_devs),
        IEEE802154_OP(IEEE802154_LLSEC_ADD_DEV, ieee802154_llsec_add_dev),
        IEEE802154_OP(IEEE802154_LLSEC_DEL_DEV, ieee802154_llsec_del_dev),
        IEEE802154_DUMP(IEEE802154_LLSEC_LIST_DEVKEY, NULL,
                        ieee802154_llsec_dump_devkeys),
        IEEE802154_OP(IEEE802154_LLSEC_ADD_DEVKEY, ieee802154_llsec_add_devkey),
        IEEE802154_OP(IEEE802154_LLSEC_DEL_DEVKEY, ieee802154_llsec_del_devkey),
        IEEE802154_DUMP(IEEE802154_LLSEC_LIST_SECLEVEL, NULL,
                        ieee802154_llsec_dump_seclevels),
        IEEE802154_OP(IEEE802154_LLSEC_ADD_SECLEVEL,
                      ieee802154_llsec_add_seclevel),
        IEEE802154_OP(IEEE802154_LLSEC_DEL_SECLEVEL,
                      ieee802154_llsec_del_seclevel),
};

static const struct genl_multicast_group ieee802154_mcgrps[] = {
        [IEEE802154_COORD_MCGRP] = { .name = IEEE802154_MCAST_COORD_NAME, },
        [IEEE802154_BEACON_MCGRP] = { .name = IEEE802154_MCAST_BEACON_NAME, },
};

struct genl_family nl802154_family __ro_after_init = {
        .hdrsize        = 0,
        .name           = IEEE802154_NL_NAME,
        .version        = 1,
        .maxattr        = IEEE802154_ATTR_MAX,
        .policy         = ieee802154_policy,
        .module         = THIS_MODULE,
        .small_ops      = ieee802154_ops,
        .n_small_ops    = ARRAY_SIZE(ieee802154_ops),
        .resv_start_op  = IEEE802154_LLSEC_DEL_SECLEVEL + 1,
        .mcgrps         = ieee802154_mcgrps,
        .n_mcgrps       = ARRAY_SIZE(ieee802154_mcgrps),
};

int __init ieee802154_nl_init(void)
{
        return genl_register_family(&nl802154_family);
}

void ieee802154_nl_exit(void)
{
        genl_unregister_family(&nl802154_family);
}