net: add NL802154 interface for configuration of 802.15.4 devices

Add a netlink interface for configuration of IEEE 802.15.4 device. Also this
interface specifies events notification sent by devices towards higher layers.

Signed-off-by: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
Signed-off-by: Sergey Lapin <slapin@ossfans.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 523 insertions, 0 deletions

diff --git a/net/ieee802154/netlink.c b/net/ieee802154/netlink.c
new file mode 100644
index 000000000000..105ad10876af
--- /dev/null
+++ b/net/ieee802154/netlink.c
@@ -0,0 +1,523 @@
+/*
+ * Netlink inteface for IEEE 802.15.4 stack
+ *
+ * Copyright 2007, 2008 Siemens AG
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Written by:
+ * Sergey Lapin <slapin@ossfans.org>
+ * Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
+ */
+
+#include <linux/kernel.h>
+#include <linux/if_arp.h>
+#include <linux/netdevice.h>
+#include <net/netlink.h>
+#include <net/genetlink.h>
+#include <linux/nl802154.h>
+#include <net/ieee802154/af_ieee802154.h>
+#include <net/ieee802154/nl802154.h>
+#include <net/ieee802154/netdevice.h>
+
+static unsigned int ieee802154_seq_num;
+
+static struct genl_family ieee802154_coordinator_family = {
+        .id             = GENL_ID_GENERATE,
+        .hdrsize        = 0,
+        .name           = IEEE802154_NL_NAME,
+        .version        = 1,
+        .maxattr        = IEEE802154_ATTR_MAX,
+};
+
+static struct genl_multicast_group ieee802154_coord_mcgrp = {
+        .name           = IEEE802154_MCAST_COORD_NAME,
+};
+
+static struct genl_multicast_group ieee802154_beacon_mcgrp = {
+        .name           = IEEE802154_MCAST_BEACON_NAME,
+};
+
+/* Requests to userspace */
+static struct sk_buff *ieee802154_nl_create(int flags, u8 req)
+{
+        void *hdr;
+        struct sk_buff *msg = nlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
+
+        if (!msg)
+                return NULL;
+
+        hdr = genlmsg_put(msg, 0, ieee802154_seq_num++,
+                        &ieee802154_coordinator_family, flags, req);
+        if (!hdr) {
+                nlmsg_free(msg);
+                return NULL;
+        }
+
+        return msg;
+}
+
+static int ieee802154_nl_finish(struct sk_buff *msg)
+{
+        /* XXX: nlh is right at the start of msg */
+        void *hdr = genlmsg_data(NLMSG_DATA(msg->data));
+
+        if (!genlmsg_end(msg, hdr))
+                goto out;
+
+        return genlmsg_multicast(msg, 0, ieee802154_coord_mcgrp.id,
+                        GFP_ATOMIC);
+out:
+        nlmsg_free(msg);
+        return -ENOBUFS;
+}
+
+int ieee802154_nl_assoc_indic(struct net_device *dev,
+                struct ieee802154_addr *addr, u8 cap)
+{
+        struct sk_buff *msg;
+
+        pr_debug("%s\n", __func__);
+
+        if (addr->addr_type != IEEE802154_ADDR_LONG) {
+                pr_err("%s: received non-long source address!\n", __func__);
+                return -EINVAL;
+        }
+
+        msg = ieee802154_nl_create(0, IEEE802154_ASSOCIATE_INDIC);
+        if (!msg)
+                return -ENOBUFS;
+
+        NLA_PUT_STRING(msg, IEEE802154_ATTR_DEV_NAME, dev->name);
+        NLA_PUT_U32(msg, IEEE802154_ATTR_DEV_INDEX, dev->ifindex);
+        NLA_PUT(msg, IEEE802154_ATTR_HW_ADDR, IEEE802154_ADDR_LEN,
+                        dev->dev_addr);
+
+        NLA_PUT(msg, IEEE802154_ATTR_SRC_HW_ADDR, IEEE802154_ADDR_LEN,
+                        addr->hwaddr);
+
+        NLA_PUT_U8(msg, IEEE802154_ATTR_CAPABILITY, cap);
+
+        return ieee802154_nl_finish(msg);
+
+nla_put_failure:
+        nlmsg_free(msg);
+        return -ENOBUFS;
+}
+EXPORT_SYMBOL(ieee802154_nl_assoc_indic);
+
+int ieee802154_nl_assoc_confirm(struct net_device *dev, u16 short_addr,
+                u8 status)
+{
+        struct sk_buff *msg;
+
+        pr_debug("%s\n", __func__);
+
+        msg = ieee802154_nl_create(0, IEEE802154_ASSOCIATE_CONF);
+        if (!msg)
+                return -ENOBUFS;
+
+        NLA_PUT_STRING(msg, IEEE802154_ATTR_DEV_NAME, dev->name);
+        NLA_PUT_U32(msg, IEEE802154_ATTR_DEV_INDEX, dev->ifindex);
+        NLA_PUT(msg, IEEE802154_ATTR_HW_ADDR, IEEE802154_ADDR_LEN,
+                        dev->dev_addr);
+
+        NLA_PUT_U16(msg, IEEE802154_ATTR_SHORT_ADDR, short_addr);
+        NLA_PUT_U8(msg, IEEE802154_ATTR_STATUS, status);
+
+        return ieee802154_nl_finish(msg);
+
+nla_put_failure:
+        nlmsg_free(msg);
+        return -ENOBUFS;
+}
+EXPORT_SYMBOL(ieee802154_nl_assoc_confirm);
+
+int ieee802154_nl_disassoc_indic(struct net_device *dev,
+                struct ieee802154_addr *addr, u8 reason)
+{
+        struct sk_buff *msg;
+
+        pr_debug("%s\n", __func__);
+
+        msg = ieee802154_nl_create(0, IEEE802154_DISASSOCIATE_INDIC);
+        if (!msg)
+                return -ENOBUFS;
+
+        NLA_PUT_STRING(msg, IEEE802154_ATTR_DEV_NAME, dev->name);
+        NLA_PUT_U32(msg, IEEE802154_ATTR_DEV_INDEX, dev->ifindex);
+        NLA_PUT(msg, IEEE802154_ATTR_HW_ADDR, IEEE802154_ADDR_LEN,
+                        dev->dev_addr);
+
+        if (addr->addr_type == IEEE802154_ADDR_LONG)
+                NLA_PUT(msg, IEEE802154_ATTR_SRC_HW_ADDR, IEEE802154_ADDR_LEN,
+                                addr->hwaddr);
+        else
+                NLA_PUT_U16(msg, IEEE802154_ATTR_SRC_SHORT_ADDR,
+                                addr->short_addr);
+
+        NLA_PUT_U8(msg, IEEE802154_ATTR_REASON, reason);
+
+        return ieee802154_nl_finish(msg);
+
+nla_put_failure:
+        nlmsg_free(msg);
+        return -ENOBUFS;
+}
+EXPORT_SYMBOL(ieee802154_nl_disassoc_indic);
+
+int ieee802154_nl_disassoc_confirm(struct net_device *dev, u8 status)
+{
+        struct sk_buff *msg;
+
+        pr_debug("%s\n", __func__);
+
+        msg = ieee802154_nl_create(0, IEEE802154_DISASSOCIATE_CONF);
+        if (!msg)
+                return -ENOBUFS;
+
+        NLA_PUT_STRING(msg, IEEE802154_ATTR_DEV_NAME, dev->name);
+        NLA_PUT_U32(msg, IEEE802154_ATTR_DEV_INDEX, dev->ifindex);
+        NLA_PUT(msg, IEEE802154_ATTR_HW_ADDR, IEEE802154_ADDR_LEN,
+                        dev->dev_addr);
+
+        NLA_PUT_U8(msg, IEEE802154_ATTR_STATUS, status);
+
+        return ieee802154_nl_finish(msg);
+
+nla_put_failure:
+        nlmsg_free(msg);
+        return -ENOBUFS;
+}
+EXPORT_SYMBOL(ieee802154_nl_disassoc_confirm);
+
+int ieee802154_nl_beacon_indic(struct net_device *dev,
+                u16 panid, u16 coord_addr)
+{
+        struct sk_buff *msg;
+
+        pr_debug("%s\n", __func__);
+
+        msg = ieee802154_nl_create(0, IEEE802154_BEACON_NOTIFY_INDIC);
+        if (!msg)
+                return -ENOBUFS;
+
+        NLA_PUT_STRING(msg, IEEE802154_ATTR_DEV_NAME, dev->name);
+        NLA_PUT_U32(msg, IEEE802154_ATTR_DEV_INDEX, dev->ifindex);
+        NLA_PUT(msg, IEEE802154_ATTR_HW_ADDR, IEEE802154_ADDR_LEN,
+                        dev->dev_addr);
+        NLA_PUT_U16(msg, IEEE802154_ATTR_COORD_SHORT_ADDR, coord_addr);
+        NLA_PUT_U16(msg, IEEE802154_ATTR_COORD_PAN_ID, panid);
+
+        return ieee802154_nl_finish(msg);
+
+nla_put_failure:
+        nlmsg_free(msg);
+        return -ENOBUFS;
+}
+EXPORT_SYMBOL(ieee802154_nl_beacon_indic);
+
+int ieee802154_nl_scan_confirm(struct net_device *dev,
+                u8 status, u8 scan_type, u32 unscanned,
+                u8 *edl/* , struct list_head *pan_desc_list */)
+{
+        struct sk_buff *msg;
+
+        pr_debug("%s\n", __func__);
+
+        msg = ieee802154_nl_create(0, IEEE802154_SCAN_CONF);
+        if (!msg)
+                return -ENOBUFS;
+
+        NLA_PUT_STRING(msg, IEEE802154_ATTR_DEV_NAME, dev->name);
+        NLA_PUT_U32(msg, IEEE802154_ATTR_DEV_INDEX, dev->ifindex);
+        NLA_PUT(msg, IEEE802154_ATTR_HW_ADDR, IEEE802154_ADDR_LEN,
+                        dev->dev_addr);
+
+        NLA_PUT_U8(msg, IEEE802154_ATTR_STATUS, status);
+        NLA_PUT_U8(msg, IEEE802154_ATTR_SCAN_TYPE, scan_type);
+        NLA_PUT_U32(msg, IEEE802154_ATTR_CHANNELS, unscanned);
+
+        if (edl)
+                NLA_PUT(msg, IEEE802154_ATTR_ED_LIST, 27, edl);
+
+        return ieee802154_nl_finish(msg);
+
+nla_put_failure:
+        nlmsg_free(msg);
+        return -ENOBUFS;
+}
+EXPORT_SYMBOL(ieee802154_nl_scan_confirm);
+
+/* Requests from userspace */
+static struct net_device *ieee802154_nl_get_dev(struct genl_info *info)
+{
+        struct net_device *dev;
+
+        if (info->attrs[IEEE802154_ATTR_DEV_NAME]) {
+                char name[IFNAMSIZ + 1];
+                nla_strlcpy(name, info->attrs[IEEE802154_ATTR_DEV_NAME],
+                                sizeof(name));
+                dev = dev_get_by_name(&init_net, name);
+        } else if (info->attrs[IEEE802154_ATTR_DEV_INDEX])
+                dev = dev_get_by_index(&init_net,
+                                nla_get_u32(info->attrs[IEEE802154_ATTR_DEV_INDEX]));
+        else
+                return NULL;
+
+        if (dev->type != ARPHRD_IEEE802154) {
+                dev_put(dev);
+                return NULL;
+        }
+
+        return dev;
+}
+
+static int ieee802154_associate_req(struct sk_buff *skb,
+                struct genl_info *info)
+{
+        struct net_device *dev;
+        struct ieee802154_addr addr;
+        int ret = -EINVAL;
+
+        if (!info->attrs[IEEE802154_ATTR_CHANNEL] ||
+            !info->attrs[IEEE802154_ATTR_COORD_PAN_ID] ||
+            (!info->attrs[IEEE802154_ATTR_COORD_HW_ADDR] &&
+                !info->attrs[IEEE802154_ATTR_COORD_SHORT_ADDR]) ||
+            !info->attrs[IEEE802154_ATTR_CAPABILITY])
+                return -EINVAL;
+
+        dev = ieee802154_nl_get_dev(info);
+        if (!dev)
+                return -ENODEV;
+
+        if (info->attrs[IEEE802154_ATTR_COORD_HW_ADDR]) {
+                addr.addr_type = IEEE802154_ADDR_LONG;
+                nla_memcpy(addr.hwaddr,
+                                info->attrs[IEEE802154_ATTR_COORD_HW_ADDR],
+                                IEEE802154_ADDR_LEN);
+        } else {
+                addr.addr_type = IEEE802154_ADDR_SHORT;
+                addr.short_addr = nla_get_u16(
+                                info->attrs[IEEE802154_ATTR_COORD_SHORT_ADDR]);
+        }
+        addr.pan_id = nla_get_u16(info->attrs[IEEE802154_ATTR_COORD_PAN_ID]);
+
+        ret = ieee802154_mlme_ops(dev)->assoc_req(dev, &addr,
+                        nla_get_u8(info->attrs[IEEE802154_ATTR_CHANNEL]),
+                        nla_get_u8(info->attrs[IEEE802154_ATTR_CAPABILITY]));
+
+        dev_put(dev);
+        return ret;
+}
+
+static int ieee802154_associate_resp(struct sk_buff *skb,
+                struct genl_info *info)
+{
+        struct net_device *dev;
+        struct ieee802154_addr addr;
+        int ret = -EINVAL;
+
+        if (!info->attrs[IEEE802154_ATTR_STATUS] ||
+            !info->attrs[IEEE802154_ATTR_DEST_HW_ADDR] ||
+            !info->attrs[IEEE802154_ATTR_DEST_SHORT_ADDR])
+                return -EINVAL;
+
+        dev = ieee802154_nl_get_dev(info);
+        if (!dev)
+                return -ENODEV;
+
+        addr.addr_type = IEEE802154_ADDR_LONG;
+        nla_memcpy(addr.hwaddr, info->attrs[IEEE802154_ATTR_DEST_HW_ADDR],
+                        IEEE802154_ADDR_LEN);
+        addr.pan_id = ieee802154_mlme_ops(dev)->get_pan_id(dev);
+
+
+        ret = ieee802154_mlme_ops(dev)->assoc_resp(dev, &addr,
+                nla_get_u16(info->attrs[IEEE802154_ATTR_DEST_SHORT_ADDR]),
+                nla_get_u8(info->attrs[IEEE802154_ATTR_STATUS]));
+
+        dev_put(dev);
+        return ret;
+}
+
+static int ieee802154_disassociate_req(struct sk_buff *skb,
+                struct genl_info *info)
+{
+        struct net_device *dev;
+        struct ieee802154_addr addr;
+        int ret = -EINVAL;
+
+        if ((!info->attrs[IEEE802154_ATTR_DEST_HW_ADDR] &&
+                !info->attrs[IEEE802154_ATTR_DEST_SHORT_ADDR]) ||
+            !info->attrs[IEEE802154_ATTR_REASON])
+                return -EINVAL;
+
+        dev = ieee802154_nl_get_dev(info);
+        if (!dev)
+                return -ENODEV;
+
+        if (info->attrs[IEEE802154_ATTR_DEST_HW_ADDR]) {
+                addr.addr_type = IEEE802154_ADDR_LONG;
+                nla_memcpy(addr.hwaddr,
+                                info->attrs[IEEE802154_ATTR_DEST_HW_ADDR],
+                                IEEE802154_ADDR_LEN);
+        } else {
+                addr.addr_type = IEEE802154_ADDR_SHORT;
+                addr.short_addr = nla_get_u16(
+                                info->attrs[IEEE802154_ATTR_DEST_SHORT_ADDR]);
+        }
+        addr.pan_id = ieee802154_mlme_ops(dev)->get_pan_id(dev);
+
+        ret = ieee802154_mlme_ops(dev)->disassoc_req(dev, &addr,
+                        nla_get_u8(info->attrs[IEEE802154_ATTR_REASON]));
+
+        dev_put(dev);
+        return ret;
+}
+
+/*
+ * PANid, channel, beacon_order = 15, superframe_order = 15,
+ * PAN_coordinator, battery_life_extension = 0,
+ * coord_realignment = 0, security_enable = 0
+*/
+static int ieee802154_start_req(struct sk_buff *skb, struct genl_info *info)
+{
+        struct net_device *dev;
+        struct ieee802154_addr addr;
+
+        u8 channel, bcn_ord, sf_ord;
+        int pan_coord, blx, coord_realign;
+        int ret;
+
+        if (!info->attrs[IEEE802154_ATTR_COORD_PAN_ID] ||
+            !info->attrs[IEEE802154_ATTR_COORD_SHORT_ADDR] ||
+            !info->attrs[IEEE802154_ATTR_CHANNEL] ||
+            !info->attrs[IEEE802154_ATTR_BCN_ORD] ||
+            !info->attrs[IEEE802154_ATTR_SF_ORD] ||
+            !info->attrs[IEEE802154_ATTR_PAN_COORD] ||
+            !info->attrs[IEEE802154_ATTR_BAT_EXT] ||
+            !info->attrs[IEEE802154_ATTR_COORD_REALIGN]
+         )
+                return -EINVAL;
+
+        dev = ieee802154_nl_get_dev(info);
+        if (!dev)
+                return -ENODEV;
+
+        addr.addr_type = IEEE802154_ADDR_SHORT;
+        addr.short_addr = nla_get_u16(
+                        info->attrs[IEEE802154_ATTR_COORD_SHORT_ADDR]);
+        addr.pan_id = nla_get_u16(info->attrs[IEEE802154_ATTR_COORD_PAN_ID]);
+
+        channel = nla_get_u8(info->attrs[IEEE802154_ATTR_CHANNEL]);
+        bcn_ord = nla_get_u8(info->attrs[IEEE802154_ATTR_BCN_ORD]);
+        sf_ord = nla_get_u8(info->attrs[IEEE802154_ATTR_SF_ORD]);
+        pan_coord = nla_get_u8(info->attrs[IEEE802154_ATTR_PAN_COORD]);
+        blx = nla_get_u8(info->attrs[IEEE802154_ATTR_BAT_EXT]);
+        coord_realign = nla_get_u8(info->attrs[IEEE802154_ATTR_COORD_REALIGN]);
+
+        ret = ieee802154_mlme_ops(dev)->start_req(dev, &addr, channel,
+                bcn_ord, sf_ord, pan_coord, blx, coord_realign);
+
+        dev_put(dev);
+        return ret;
+}
+
+static int ieee802154_scan_req(struct sk_buff *skb, struct genl_info *info)
+{
+        struct net_device *dev;
+        int ret;
+        u8 type;
+        u32 channels;
+        u8 duration;
+
+        if (!info->attrs[IEEE802154_ATTR_SCAN_TYPE] ||
+            !info->attrs[IEEE802154_ATTR_CHANNELS] ||
+            !info->attrs[IEEE802154_ATTR_DURATION])
+                return -EINVAL;
+
+        dev = ieee802154_nl_get_dev(info);
+        if (!dev)
+                return -ENODEV;
+
+        type = nla_get_u8(info->attrs[IEEE802154_ATTR_SCAN_TYPE]);
+        channels = nla_get_u32(info->attrs[IEEE802154_ATTR_CHANNELS]);
+        duration = nla_get_u8(info->attrs[IEEE802154_ATTR_DURATION]);
+
+        ret = ieee802154_mlme_ops(dev)->scan_req(dev, type, channels,
+                        duration);
+
+        dev_put(dev);
+        return ret;
+}
+
+#define IEEE802154_OP(_cmd, _func)                      \
+        {                                               \
+                .cmd    = _cmd,                         \
+                .policy = ieee802154_policy,            \
+                .doit   = _func,                        \
+                .dumpit = NULL,                         \
+                .flags  = GENL_ADMIN_PERM,              \
+        }
+
+static struct genl_ops ieee802154_coordinator_ops[] = {
+        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),
+};
+
+static int __init ieee802154_nl_init(void)
+{
+        int rc;
+        int i;
+
+        rc = genl_register_family(&ieee802154_coordinator_family);
+        if (rc)
+                goto fail;
+
+        rc = genl_register_mc_group(&ieee802154_coordinator_family,
+                        &ieee802154_coord_mcgrp);
+        if (rc)
+                goto fail;
+
+        rc = genl_register_mc_group(&ieee802154_coordinator_family,
+                        &ieee802154_beacon_mcgrp);
+        if (rc)
+                goto fail;
+
+
+        for (i = 0; i < ARRAY_SIZE(ieee802154_coordinator_ops); i++) {
+                rc = genl_register_ops(&ieee802154_coordinator_family,
+                                &ieee802154_coordinator_ops[i]);
+                if (rc)
+                        goto fail;
+        }
+
+        return 0;
+
+fail:
+        genl_unregister_family(&ieee802154_coordinator_family);
+        return rc;
+}
+module_init(ieee802154_nl_init);
+
+static void __exit ieee802154_nl_exit(void)
+{
+        genl_unregister_family(&ieee802154_coordinator_family);
+}
+module_exit(ieee802154_nl_exit);
+