ieee802154: add LIST_PHY command support

Add nl802154 command to get information about PHY's present in
the system.

Signed-off-by: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>

1 files changed, 188 insertions, 0 deletions

diff --git a/net/ieee802154/nl-phy.c b/net/ieee802154/nl-phy.c
new file mode 100644
index 000000000000..b7af722eb784
--- /dev/null
+++ b/net/ieee802154/nl-phy.c
@@ -0,0 +1,188 @@
+/*
+ * 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>
+ * Maxim Osipov <maxim.osipov@siemens.com>
+ */
+
+#include <linux/kernel.h>
+#include <net/netlink.h>
+#include <net/genetlink.h>
+#include <net/wpan-phy.h>
+#include <linux/nl802154.h>
+
+#include "ieee802154.h"
+
+static int ieee802154_nl_fill_phy(struct sk_buff *msg, u32 pid,
+        u32 seq, int flags, struct wpan_phy *phy)
+{
+        void *hdr;
+        int i, pages = 0;
+        uint32_t *buf = kzalloc(32 * sizeof(uint32_t), GFP_KERNEL);
+
+        pr_debug("%s\n", __func__);
+
+        if (!buf)
+                goto out;
+
+        hdr = genlmsg_put(msg, 0, seq, &nl802154_family, flags,
+                IEEE802154_LIST_PHY);
+        if (!hdr)
+                goto out;
+
+        mutex_lock(&phy->pib_lock);
+        NLA_PUT_STRING(msg, IEEE802154_ATTR_PHY_NAME, wpan_phy_name(phy));
+
+        NLA_PUT_U8(msg, IEEE802154_ATTR_PAGE, phy->current_page);
+        NLA_PUT_U8(msg, IEEE802154_ATTR_CHANNEL, phy->current_channel);
+        for (i = 0; i < 32; i++) {
+                if (phy->channels_supported[i])
+                        buf[pages++] = phy->channels_supported[i] | (i << 27);
+        }
+        if (pages)
+                NLA_PUT(msg, IEEE802154_ATTR_CHANNEL_PAGE_LIST,
+                                pages * sizeof(uint32_t), buf);
+
+        mutex_unlock(&phy->pib_lock);
+        return genlmsg_end(msg, hdr);
+
+nla_put_failure:
+        mutex_unlock(&phy->pib_lock);
+        genlmsg_cancel(msg, hdr);
+out:
+        kfree(buf);
+        return -EMSGSIZE;
+}
+
+static int ieee802154_list_phy(struct sk_buff *skb,
+        struct genl_info *info)
+{
+        /* Request for interface name, index, type, IEEE address,
+           PAN Id, short address */
+        struct sk_buff *msg;
+        struct wpan_phy *phy;
+        const char *name;
+        int rc = -ENOBUFS;
+
+        pr_debug("%s\n", __func__);
+
+        if (!info->attrs[IEEE802154_ATTR_PHY_NAME])
+                return -EINVAL;
+
+        name = nla_data(info->attrs[IEEE802154_ATTR_PHY_NAME]);
+        if (name[nla_len(info->attrs[IEEE802154_ATTR_PHY_NAME]) - 1] != '\0')
+                return -EINVAL; /* phy name should be null-terminated */
+
+
+        phy = wpan_phy_find(name);
+        if (!phy)
+                return -ENODEV;
+
+        msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
+        if (!msg)
+                goto out_dev;
+
+        rc = ieee802154_nl_fill_phy(msg, info->snd_pid, info->snd_seq,
+                        0, phy);
+        if (rc < 0)
+                goto out_free;
+
+        wpan_phy_put(phy);
+
+        return genlmsg_reply(msg, info);
+out_free:
+        nlmsg_free(msg);
+out_dev:
+        wpan_phy_put(phy);
+        return rc;
+
+}
+
+struct dump_phy_data {
+        struct sk_buff *skb;
+        struct netlink_callback *cb;
+        int idx, s_idx;
+};
+
+static int ieee802154_dump_phy_iter(struct wpan_phy *phy, void *_data)
+{
+        int rc;
+        struct dump_phy_data *data = _data;
+
+        pr_debug("%s\n", __func__);
+
+        if (data->idx++ < data->s_idx)
+                return 0;
+
+        rc = ieee802154_nl_fill_phy(data->skb,
+                        NETLINK_CB(data->cb->skb).pid,
+                        data->cb->nlh->nlmsg_seq,
+                        NLM_F_MULTI,
+                        phy);
+
+        if (rc < 0) {
+                data->idx--;
+                return rc;
+        }
+
+        return 0;
+}
+
+static int ieee802154_dump_phy(struct sk_buff *skb,
+        struct netlink_callback *cb)
+{
+        struct dump_phy_data data = {
+                .cb = cb,
+                .skb = skb,
+                .s_idx = cb->args[0],
+                .idx = 0,
+        };
+
+        pr_debug("%s\n", __func__);
+
+        wpan_phy_for_each(ieee802154_dump_phy_iter, &data);
+
+        cb->args[0] = data.idx;
+
+        return skb->len;
+}
+
+static struct genl_ops ieee802154_phy_ops[] = {
+        IEEE802154_DUMP(IEEE802154_LIST_PHY, ieee802154_list_phy,
+                                                        ieee802154_dump_phy),
+};
+
+/*
+ * No need to unregister as family unregistration will do it.
+ */
+int nl802154_phy_register(void)
+{
+        int i;
+        int rc;
+
+        for (i = 0; i < ARRAY_SIZE(ieee802154_phy_ops); i++) {
+                rc = genl_register_ops(&nl802154_family,
+                                &ieee802154_phy_ops[i]);
+                if (rc)
+                        return rc;
+        }
+
+        return 0;
+}