ieee802154: add nl802154 framework
This patch adds a basic nl802154 framework. Most of this code was
grabbed from nl80211 framework.
Signed-off-by: Alexander Aring <alex.aring@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
diff --git a/net/ieee802154/nl802154.c b/net/ieee802154/nl802154.c
new file mode 100644
index 0000000..5dec0bb
--- /dev/null
+++ b/net/ieee802154/nl802154.c
@@ -0,0 +1,309 @@
+/* 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 "core.h"
+
+static int nl802154_pre_doit(const struct genl_ops *ops, struct sk_buff *skb,
+ struct genl_info *info);
+
+static void nl802154_post_doit(const struct genl_ops *ops, struct sk_buff *skb,
+ struct genl_info *info);
+
+/* the netlink family */
+static struct genl_family nl802154_fam = {
+ .id = GENL_ID_GENERATE, /* don't bother with a hardcoded ID */
+ .name = NL802154_GENL_NAME, /* have users key off the name instead */
+ .hdrsize = 0, /* no private header */
+ .version = 1, /* no particular meaning now */
+ .maxattr = NL802154_ATTR_MAX,
+ .netnsok = true,
+ .pre_doit = nl802154_pre_doit,
+ .post_doit = nl802154_post_doit,
+};
+
+/* 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;
+
+ /* TODO netns compare */
+
+ 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);
+}
+
+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);
+
+ /* TODO netns compare */
+
+ return rdev;
+}
+
+/* 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);
+}
+
+/* policy for the attributes */
+static const struct nla_policy nl802154_policy[NL802154_ATTR_MAX+1] = {
+};
+
+/* 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);
+}
+
+#define NL802154_FLAG_NEED_WPAN_PHY 0x01
+#define NL802154_FLAG_NEED_NETDEV 0x02
+#define NL802154_FLAG_NEED_RTNL 0x04
+#define NL802154_FLAG_CHECK_NETDEV_UP 0x08
+#define NL802154_FLAG_NEED_NETDEV_UP (NL802154_FLAG_NEED_NETDEV |\
+ NL802154_FLAG_CHECK_NETDEV_UP)
+#define NL802154_FLAG_NEED_WPAN_DEV 0x10
+#define NL802154_FLAG_NEED_WPAN_DEV_UP (NL802154_FLAG_NEED_WPAN_DEV |\
+ NL802154_FLAG_CHECK_NETDEV_UP)
+
+static int nl802154_pre_doit(const struct genl_ops *ops, struct sk_buff *skb,
+ struct genl_info *info)
+{
+ struct cfg802154_registered_device *rdev;
+ struct wpan_dev *wpan_dev;
+ struct net_device *dev;
+ bool rtnl = ops->internal_flags & NL802154_FLAG_NEED_RTNL;
+
+ if (rtnl)
+ rtnl_lock();
+
+ if (ops->internal_flags & NL802154_FLAG_NEED_WPAN_PHY) {
+ rdev = cfg802154_get_dev_from_info(genl_info_net(info), info);
+ if (IS_ERR(rdev)) {
+ if (rtnl)
+ rtnl_unlock();
+ return PTR_ERR(rdev);
+ }
+ info->user_ptr[0] = rdev;
+ } else if (ops->internal_flags & NL802154_FLAG_NEED_NETDEV ||
+ ops->internal_flags & NL802154_FLAG_NEED_WPAN_DEV) {
+ ASSERT_RTNL();
+ wpan_dev = __cfg802154_wpan_dev_from_attrs(genl_info_net(info),
+ info->attrs);
+ if (IS_ERR(wpan_dev)) {
+ if (rtnl)
+ rtnl_unlock();
+ return PTR_ERR(wpan_dev);
+ }
+
+ dev = wpan_dev->netdev;
+ rdev = wpan_phy_to_rdev(wpan_dev->wpan_phy);
+
+ if (ops->internal_flags & NL802154_FLAG_NEED_NETDEV) {
+ if (!dev) {
+ if (rtnl)
+ rtnl_unlock();
+ return -EINVAL;
+ }
+
+ info->user_ptr[1] = dev;
+ } else {
+ info->user_ptr[1] = wpan_dev;
+ }
+
+ if (dev) {
+ if (ops->internal_flags & NL802154_FLAG_CHECK_NETDEV_UP &&
+ !netif_running(dev)) {
+ if (rtnl)
+ rtnl_unlock();
+ return -ENETDOWN;
+ }
+
+ dev_hold(dev);
+ }
+
+ info->user_ptr[0] = rdev;
+ }
+
+ return 0;
+}
+
+static void nl802154_post_doit(const struct genl_ops *ops, struct sk_buff *skb,
+ struct genl_info *info)
+{
+ if (info->user_ptr[1]) {
+ if (ops->internal_flags & NL802154_FLAG_NEED_WPAN_DEV) {
+ struct wpan_dev *wpan_dev = info->user_ptr[1];
+
+ if (wpan_dev->netdev)
+ dev_put(wpan_dev->netdev);
+ } else {
+ dev_put(info->user_ptr[1]);
+ }
+ }
+
+ if (ops->internal_flags & NL802154_FLAG_NEED_RTNL)
+ rtnl_unlock();
+}
+
+static const struct genl_ops nl802154_ops[] = {
+};
+
+/* initialisation/exit functions */
+int nl802154_init(void)
+{
+ return genl_register_family_with_ops_groups(&nl802154_fam, nl802154_ops,
+ nl802154_mcgrps);
+}
+
+void nl802154_exit(void)
+{
+ genl_unregister_family(&nl802154_fam);
+}