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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
commit2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch)
tree848558de17fb3008cdf4d861b01ac7781903ce39 /net/ieee802154/6lowpan/core.c
parentInitial commit. (diff)
downloadlinux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz
linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip
Adding upstream version 6.1.76.upstream/6.1.76
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'net/ieee802154/6lowpan/core.c')
-rw-r--r--net/ieee802154/6lowpan/core.c284
1 files changed, 284 insertions, 0 deletions
diff --git a/net/ieee802154/6lowpan/core.c b/net/ieee802154/6lowpan/core.c
new file mode 100644
index 000000000..2c087b7f1
--- /dev/null
+++ b/net/ieee802154/6lowpan/core.c
@@ -0,0 +1,284 @@
+/* Copyright 2011, Siemens AG
+ * written by Alexander Smirnov <alex.bluesman.smirnov@gmail.com>
+ */
+
+/* Based on patches from Jon Smirl <jonsmirl@gmail.com>
+ * Copyright (c) 2011 Jon Smirl <jonsmirl@gmail.com>
+ *
+ * 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.
+ */
+
+/* Jon's code is based on 6lowpan implementation for Contiki which is:
+ * Copyright (c) 2008, Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the Institute nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <linux/module.h>
+#include <linux/netdevice.h>
+#include <linux/ieee802154.h>
+#include <linux/if_arp.h>
+
+#include <net/ipv6.h>
+
+#include "6lowpan_i.h"
+
+static int open_count;
+
+static const struct header_ops lowpan_header_ops = {
+ .create = lowpan_header_create,
+};
+
+static int lowpan_dev_init(struct net_device *ldev)
+{
+ netdev_lockdep_set_classes(ldev);
+
+ return 0;
+}
+
+static int lowpan_open(struct net_device *dev)
+{
+ if (!open_count)
+ lowpan_rx_init();
+ open_count++;
+ return 0;
+}
+
+static int lowpan_stop(struct net_device *dev)
+{
+ open_count--;
+ if (!open_count)
+ lowpan_rx_exit();
+ return 0;
+}
+
+static int lowpan_neigh_construct(struct net_device *dev, struct neighbour *n)
+{
+ struct lowpan_802154_neigh *neigh = lowpan_802154_neigh(neighbour_priv(n));
+
+ /* default no short_addr is available for a neighbour */
+ neigh->short_addr = cpu_to_le16(IEEE802154_ADDR_SHORT_UNSPEC);
+ return 0;
+}
+
+static int lowpan_get_iflink(const struct net_device *dev)
+{
+ return lowpan_802154_dev(dev)->wdev->ifindex;
+}
+
+static const struct net_device_ops lowpan_netdev_ops = {
+ .ndo_init = lowpan_dev_init,
+ .ndo_start_xmit = lowpan_xmit,
+ .ndo_open = lowpan_open,
+ .ndo_stop = lowpan_stop,
+ .ndo_neigh_construct = lowpan_neigh_construct,
+ .ndo_get_iflink = lowpan_get_iflink,
+};
+
+static void lowpan_setup(struct net_device *ldev)
+{
+ memset(ldev->broadcast, 0xff, IEEE802154_ADDR_LEN);
+ /* We need an ipv6hdr as minimum len when calling xmit */
+ ldev->hard_header_len = sizeof(struct ipv6hdr);
+ ldev->flags = IFF_BROADCAST | IFF_MULTICAST;
+ ldev->priv_flags |= IFF_NO_QUEUE;
+
+ ldev->netdev_ops = &lowpan_netdev_ops;
+ ldev->header_ops = &lowpan_header_ops;
+ ldev->needs_free_netdev = true;
+ ldev->features |= NETIF_F_NETNS_LOCAL;
+}
+
+static int lowpan_validate(struct nlattr *tb[], struct nlattr *data[],
+ struct netlink_ext_ack *extack)
+{
+ if (tb[IFLA_ADDRESS]) {
+ if (nla_len(tb[IFLA_ADDRESS]) != IEEE802154_ADDR_LEN)
+ return -EINVAL;
+ }
+ return 0;
+}
+
+static int lowpan_newlink(struct net *src_net, struct net_device *ldev,
+ struct nlattr *tb[], struct nlattr *data[],
+ struct netlink_ext_ack *extack)
+{
+ struct net_device *wdev;
+ int ret;
+
+ ASSERT_RTNL();
+
+ pr_debug("adding new link\n");
+
+ if (!tb[IFLA_LINK])
+ return -EINVAL;
+ /* find and hold wpan device */
+ wdev = dev_get_by_index(dev_net(ldev), nla_get_u32(tb[IFLA_LINK]));
+ if (!wdev)
+ return -ENODEV;
+ if (wdev->type != ARPHRD_IEEE802154) {
+ dev_put(wdev);
+ return -EINVAL;
+ }
+
+ if (wdev->ieee802154_ptr->lowpan_dev) {
+ dev_put(wdev);
+ return -EBUSY;
+ }
+
+ lowpan_802154_dev(ldev)->wdev = wdev;
+ /* Set the lowpan hardware address to the wpan hardware address. */
+ __dev_addr_set(ldev, wdev->dev_addr, IEEE802154_ADDR_LEN);
+ /* We need headroom for possible wpan_dev_hard_header call and tailroom
+ * for encryption/fcs handling. The lowpan interface will replace
+ * the IPv6 header with 6LoWPAN header. At worst case the 6LoWPAN
+ * header has LOWPAN_IPHC_MAX_HEADER_LEN more bytes than the IPv6
+ * header.
+ */
+ ldev->needed_headroom = LOWPAN_IPHC_MAX_HEADER_LEN +
+ wdev->needed_headroom;
+ ldev->needed_tailroom = wdev->needed_tailroom;
+
+ ldev->neigh_priv_len = sizeof(struct lowpan_802154_neigh);
+
+ ret = lowpan_register_netdevice(ldev, LOWPAN_LLTYPE_IEEE802154);
+ if (ret < 0) {
+ dev_put(wdev);
+ return ret;
+ }
+
+ wdev->ieee802154_ptr->lowpan_dev = ldev;
+ return 0;
+}
+
+static void lowpan_dellink(struct net_device *ldev, struct list_head *head)
+{
+ struct net_device *wdev = lowpan_802154_dev(ldev)->wdev;
+
+ ASSERT_RTNL();
+
+ wdev->ieee802154_ptr->lowpan_dev = NULL;
+ lowpan_unregister_netdevice(ldev);
+ dev_put(wdev);
+}
+
+static struct rtnl_link_ops lowpan_link_ops __read_mostly = {
+ .kind = "lowpan",
+ .priv_size = LOWPAN_PRIV_SIZE(sizeof(struct lowpan_802154_dev)),
+ .setup = lowpan_setup,
+ .newlink = lowpan_newlink,
+ .dellink = lowpan_dellink,
+ .validate = lowpan_validate,
+};
+
+static inline int __init lowpan_netlink_init(void)
+{
+ return rtnl_link_register(&lowpan_link_ops);
+}
+
+static inline void lowpan_netlink_fini(void)
+{
+ rtnl_link_unregister(&lowpan_link_ops);
+}
+
+static int lowpan_device_event(struct notifier_block *unused,
+ unsigned long event, void *ptr)
+{
+ struct net_device *ndev = netdev_notifier_info_to_dev(ptr);
+ struct wpan_dev *wpan_dev;
+
+ if (ndev->type != ARPHRD_IEEE802154)
+ return NOTIFY_DONE;
+ wpan_dev = ndev->ieee802154_ptr;
+ if (!wpan_dev)
+ return NOTIFY_DONE;
+
+ switch (event) {
+ case NETDEV_UNREGISTER:
+ /* Check if wpan interface is unregistered that we
+ * also delete possible lowpan interfaces which belongs
+ * to the wpan interface.
+ */
+ if (wpan_dev->lowpan_dev)
+ lowpan_dellink(wpan_dev->lowpan_dev, NULL);
+ break;
+ default:
+ return NOTIFY_DONE;
+ }
+
+ return NOTIFY_OK;
+}
+
+static struct notifier_block lowpan_dev_notifier = {
+ .notifier_call = lowpan_device_event,
+};
+
+static int __init lowpan_init_module(void)
+{
+ int err = 0;
+
+ err = lowpan_net_frag_init();
+ if (err < 0)
+ goto out;
+
+ err = lowpan_netlink_init();
+ if (err < 0)
+ goto out_frag;
+
+ err = register_netdevice_notifier(&lowpan_dev_notifier);
+ if (err < 0)
+ goto out_pack;
+
+ return 0;
+
+out_pack:
+ lowpan_netlink_fini();
+out_frag:
+ lowpan_net_frag_exit();
+out:
+ return err;
+}
+
+static void __exit lowpan_cleanup_module(void)
+{
+ lowpan_netlink_fini();
+
+ lowpan_net_frag_exit();
+
+ unregister_netdevice_notifier(&lowpan_dev_notifier);
+}
+
+module_init(lowpan_init_module);
+module_exit(lowpan_cleanup_module);
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_RTNL_LINK("lowpan");