This patch creates an 6lowpan sub-directory inside ieee802154.
Additional we move all ieee802154 6lowpan relevant files into
this sub-directory instead of placing the 6lowpan related files
inside ieee802154.
Signed-off-by: Alexander Aring <alex.aring@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
--- /dev/null
+/* 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/bitops.h>
+#include <linux/if_arp.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/netdevice.h>
+#include <linux/ieee802154.h>
+#include <net/af_ieee802154.h>
+#include <net/ieee802154_netdev.h>
+#include <net/6lowpan.h>
+#include <net/ipv6.h>
+
+#include "reassembly.h"
+
+static LIST_HEAD(lowpan_devices);
+static int lowpan_open_count;
+
+/* private device info */
+struct lowpan_dev_info {
+ struct net_device *real_dev; /* real WPAN device ptr */
+ struct mutex dev_list_mtx; /* mutex for list ops */
+ u16 fragment_tag;
+};
+
+struct lowpan_dev_record {
+ struct net_device *ldev;
+ struct list_head list;
+};
+
+/* don't save pan id, it's intra pan */
+struct lowpan_addr {
+ u8 mode;
+ union {
+ /* IPv6 needs big endian here */
+ __be64 extended_addr;
+ __be16 short_addr;
+ } u;
+};
+
+struct lowpan_addr_info {
+ struct lowpan_addr daddr;
+ struct lowpan_addr saddr;
+};
+
+static inline struct
+lowpan_dev_info *lowpan_dev_info(const struct net_device *dev)
+{
+ return netdev_priv(dev);
+}
+
+static inline struct
+lowpan_addr_info *lowpan_skb_priv(const struct sk_buff *skb)
+{
+ WARN_ON_ONCE(skb_headroom(skb) < sizeof(struct lowpan_addr_info));
+ return (struct lowpan_addr_info *)(skb->data -
+ sizeof(struct lowpan_addr_info));
+}
+
+static int lowpan_header_create(struct sk_buff *skb, struct net_device *dev,
+ unsigned short type, const void *_daddr,
+ const void *_saddr, unsigned int len)
+{
+ const u8 *saddr = _saddr;
+ const u8 *daddr = _daddr;
+ struct lowpan_addr_info *info;
+
+ /* TODO:
+ * if this package isn't ipv6 one, where should it be routed?
+ */
+ if (type != ETH_P_IPV6)
+ return 0;
+
+ if (!saddr)
+ saddr = dev->dev_addr;
+
+ raw_dump_inline(__func__, "saddr", (unsigned char *)saddr, 8);
+ raw_dump_inline(__func__, "daddr", (unsigned char *)daddr, 8);
+
+ info = lowpan_skb_priv(skb);
+
+ /* TODO: Currently we only support extended_addr */
+ info->daddr.mode = IEEE802154_ADDR_LONG;
+ memcpy(&info->daddr.u.extended_addr, daddr,
+ sizeof(info->daddr.u.extended_addr));
+ info->saddr.mode = IEEE802154_ADDR_LONG;
+ memcpy(&info->saddr.u.extended_addr, saddr,
+ sizeof(info->daddr.u.extended_addr));
+
+ return 0;
+}
+
+static int lowpan_give_skb_to_devices(struct sk_buff *skb,
+ struct net_device *dev)
+{
+ struct lowpan_dev_record *entry;
+ struct sk_buff *skb_cp;
+ int stat = NET_RX_SUCCESS;
+
+ skb->protocol = htons(ETH_P_IPV6);
+ skb->pkt_type = PACKET_HOST;
+
+ rcu_read_lock();
+ list_for_each_entry_rcu(entry, &lowpan_devices, list)
+ if (lowpan_dev_info(entry->ldev)->real_dev == skb->dev) {
+ skb_cp = skb_copy(skb, GFP_ATOMIC);
+ if (!skb_cp) {
+ kfree_skb(skb);
+ rcu_read_unlock();
+ return NET_RX_DROP;
+ }
+
+ skb_cp->dev = entry->ldev;
+ stat = netif_rx(skb_cp);
+ if (stat == NET_RX_DROP)
+ break;
+ }
+ rcu_read_unlock();
+
+ consume_skb(skb);
+
+ return stat;
+}
+
+static int
+iphc_decompress(struct sk_buff *skb, const struct ieee802154_hdr *hdr)
+{
+ u8 iphc0, iphc1;
+ struct ieee802154_addr_sa sa, da;
+ void *sap, *dap;
+
+ raw_dump_table(__func__, "raw skb data dump", skb->data, skb->len);
+ /* at least two bytes will be used for the encoding */
+ if (skb->len < 2)
+ return -EINVAL;
+
+ if (lowpan_fetch_skb_u8(skb, &iphc0))
+ return -EINVAL;
+
+ if (lowpan_fetch_skb_u8(skb, &iphc1))
+ return -EINVAL;
+
+ ieee802154_addr_to_sa(&sa, &hdr->source);
+ ieee802154_addr_to_sa(&da, &hdr->dest);
+
+ if (sa.addr_type == IEEE802154_ADDR_SHORT)
+ sap = &sa.short_addr;
+ else
+ sap = &sa.hwaddr;
+
+ if (da.addr_type == IEEE802154_ADDR_SHORT)
+ dap = &da.short_addr;
+ else
+ dap = &da.hwaddr;
+
+ return lowpan_header_decompress(skb, skb->dev, sap, sa.addr_type,
+ IEEE802154_ADDR_LEN, dap, da.addr_type,
+ IEEE802154_ADDR_LEN, iphc0, iphc1);
+}
+
+static struct sk_buff*
+lowpan_alloc_frag(struct sk_buff *skb, int size,
+ const struct ieee802154_hdr *master_hdr)
+{
+ struct net_device *real_dev = lowpan_dev_info(skb->dev)->real_dev;
+ struct sk_buff *frag;
+ int rc;
+
+ frag = alloc_skb(real_dev->hard_header_len +
+ real_dev->needed_tailroom + size,
+ GFP_ATOMIC);
+
+ if (likely(frag)) {
+ frag->dev = real_dev;
+ frag->priority = skb->priority;
+ skb_reserve(frag, real_dev->hard_header_len);
+ skb_reset_network_header(frag);
+ *mac_cb(frag) = *mac_cb(skb);
+
+ rc = dev_hard_header(frag, real_dev, 0, &master_hdr->dest,
+ &master_hdr->source, size);
+ if (rc < 0) {
+ kfree_skb(frag);
+ return ERR_PTR(rc);
+ }
+ } else {
+ frag = ERR_PTR(-ENOMEM);
+ }
+
+ return frag;
+}
+
+static int
+lowpan_xmit_fragment(struct sk_buff *skb, const struct ieee802154_hdr *wpan_hdr,
+ u8 *frag_hdr, int frag_hdrlen,
+ int offset, int len)
+{
+ struct sk_buff *frag;
+
+ raw_dump_inline(__func__, " fragment header", frag_hdr, frag_hdrlen);
+
+ frag = lowpan_alloc_frag(skb, frag_hdrlen + len, wpan_hdr);
+ if (IS_ERR(frag))
+ return -PTR_ERR(frag);
+
+ memcpy(skb_put(frag, frag_hdrlen), frag_hdr, frag_hdrlen);
+ memcpy(skb_put(frag, len), skb_network_header(skb) + offset, len);
+
+ raw_dump_table(__func__, " fragment dump", frag->data, frag->len);
+
+ return dev_queue_xmit(frag);
+}
+
+static int
+lowpan_xmit_fragmented(struct sk_buff *skb, struct net_device *dev,
+ const struct ieee802154_hdr *wpan_hdr)
+{
+ u16 dgram_size, dgram_offset;
+ __be16 frag_tag;
+ u8 frag_hdr[5];
+ int frag_cap, frag_len, payload_cap, rc;
+ int skb_unprocessed, skb_offset;
+
+ dgram_size = lowpan_uncompress_size(skb, &dgram_offset) -
+ skb->mac_len;
+ frag_tag = htons(lowpan_dev_info(dev)->fragment_tag);
+ lowpan_dev_info(dev)->fragment_tag++;
+
+ frag_hdr[0] = LOWPAN_DISPATCH_FRAG1 | ((dgram_size >> 8) & 0x07);
+ frag_hdr[1] = dgram_size & 0xff;
+ memcpy(frag_hdr + 2, &frag_tag, sizeof(frag_tag));
+
+ payload_cap = ieee802154_max_payload(wpan_hdr);
+
+ frag_len = round_down(payload_cap - LOWPAN_FRAG1_HEAD_SIZE -
+ skb_network_header_len(skb), 8);
+
+ skb_offset = skb_network_header_len(skb);
+ skb_unprocessed = skb->len - skb->mac_len - skb_offset;
+
+ rc = lowpan_xmit_fragment(skb, wpan_hdr, frag_hdr,
+ LOWPAN_FRAG1_HEAD_SIZE, 0,
+ frag_len + skb_network_header_len(skb));
+ if (rc) {
+ pr_debug("%s unable to send FRAG1 packet (tag: %d)",
+ __func__, ntohs(frag_tag));
+ goto err;
+ }
+
+ frag_hdr[0] &= ~LOWPAN_DISPATCH_FRAG1;
+ frag_hdr[0] |= LOWPAN_DISPATCH_FRAGN;
+ frag_cap = round_down(payload_cap - LOWPAN_FRAGN_HEAD_SIZE, 8);
+
+ do {
+ dgram_offset += frag_len;
+ skb_offset += frag_len;
+ skb_unprocessed -= frag_len;
+ frag_len = min(frag_cap, skb_unprocessed);
+
+ frag_hdr[4] = dgram_offset >> 3;
+
+ rc = lowpan_xmit_fragment(skb, wpan_hdr, frag_hdr,
+ LOWPAN_FRAGN_HEAD_SIZE, skb_offset,
+ frag_len);
+ if (rc) {
+ pr_debug("%s unable to send a FRAGN packet. (tag: %d, offset: %d)\n",
+ __func__, ntohs(frag_tag), skb_offset);
+ goto err;
+ }
+ } while (skb_unprocessed > frag_cap);
+
+ consume_skb(skb);
+ return NET_XMIT_SUCCESS;
+
+err:
+ kfree_skb(skb);
+ return rc;
+}
+
+static int lowpan_header(struct sk_buff *skb, struct net_device *dev)
+{
+ struct ieee802154_addr sa, da;
+ struct ieee802154_mac_cb *cb = mac_cb_init(skb);
+ struct lowpan_addr_info info;
+ void *daddr, *saddr;
+
+ memcpy(&info, lowpan_skb_priv(skb), sizeof(info));
+
+ /* TODO: Currently we only support extended_addr */
+ daddr = &info.daddr.u.extended_addr;
+ saddr = &info.saddr.u.extended_addr;
+
+ lowpan_header_compress(skb, dev, ETH_P_IPV6, daddr, saddr, skb->len);
+
+ cb->type = IEEE802154_FC_TYPE_DATA;
+
+ /* prepare wpan address data */
+ sa.mode = IEEE802154_ADDR_LONG;
+ sa.pan_id = ieee802154_mlme_ops(dev)->get_pan_id(dev);
+ sa.extended_addr = ieee802154_devaddr_from_raw(saddr);
+
+ /* intra-PAN communications */
+ da.pan_id = sa.pan_id;
+
+ /* if the destination address is the broadcast address, use the
+ * corresponding short address
+ */
+ if (lowpan_is_addr_broadcast((const u8 *)daddr)) {
+ da.mode = IEEE802154_ADDR_SHORT;
+ da.short_addr = cpu_to_le16(IEEE802154_ADDR_BROADCAST);
+ cb->ackreq = false;
+ } else {
+ da.mode = IEEE802154_ADDR_LONG;
+ da.extended_addr = ieee802154_devaddr_from_raw(daddr);
+ cb->ackreq = true;
+ }
+
+ return dev_hard_header(skb, lowpan_dev_info(dev)->real_dev,
+ ETH_P_IPV6, (void *)&da, (void *)&sa, 0);
+}
+
+static netdev_tx_t lowpan_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+ struct ieee802154_hdr wpan_hdr;
+ int max_single, ret;
+
+ pr_debug("package xmit\n");
+
+ /* We must take a copy of the skb before we modify/replace the ipv6
+ * header as the header could be used elsewhere
+ */
+ skb = skb_unshare(skb, GFP_ATOMIC);
+ if (!skb)
+ return NET_XMIT_DROP;
+
+ ret = lowpan_header(skb, dev);
+ if (ret < 0) {
+ kfree_skb(skb);
+ return NET_XMIT_DROP;
+ }
+
+ if (ieee802154_hdr_peek(skb, &wpan_hdr) < 0) {
+ kfree_skb(skb);
+ return NET_XMIT_DROP;
+ }
+
+ max_single = ieee802154_max_payload(&wpan_hdr);
+
+ if (skb_tail_pointer(skb) - skb_network_header(skb) <= max_single) {
+ skb->dev = lowpan_dev_info(dev)->real_dev;
+ return dev_queue_xmit(skb);
+ } else {
+ netdev_tx_t rc;
+
+ pr_debug("frame is too big, fragmentation is needed\n");
+ rc = lowpan_xmit_fragmented(skb, dev, &wpan_hdr);
+
+ return rc < 0 ? NET_XMIT_DROP : rc;
+ }
+}
+
+static __le16 lowpan_get_pan_id(const struct net_device *dev)
+{
+ struct net_device *real_dev = lowpan_dev_info(dev)->real_dev;
+
+ return ieee802154_mlme_ops(real_dev)->get_pan_id(real_dev);
+}
+
+static __le16 lowpan_get_short_addr(const struct net_device *dev)
+{
+ struct net_device *real_dev = lowpan_dev_info(dev)->real_dev;
+
+ return ieee802154_mlme_ops(real_dev)->get_short_addr(real_dev);
+}
+
+static u8 lowpan_get_dsn(const struct net_device *dev)
+{
+ struct net_device *real_dev = lowpan_dev_info(dev)->real_dev;
+
+ return ieee802154_mlme_ops(real_dev)->get_dsn(real_dev);
+}
+
+static struct header_ops lowpan_header_ops = {
+ .create = lowpan_header_create,
+};
+
+static struct lock_class_key lowpan_tx_busylock;
+static struct lock_class_key lowpan_netdev_xmit_lock_key;
+
+static void lowpan_set_lockdep_class_one(struct net_device *dev,
+ struct netdev_queue *txq,
+ void *_unused)
+{
+ lockdep_set_class(&txq->_xmit_lock,
+ &lowpan_netdev_xmit_lock_key);
+}
+
+static int lowpan_dev_init(struct net_device *dev)
+{
+ netdev_for_each_tx_queue(dev, lowpan_set_lockdep_class_one, NULL);
+ dev->qdisc_tx_busylock = &lowpan_tx_busylock;
+ return 0;
+}
+
+static const struct net_device_ops lowpan_netdev_ops = {
+ .ndo_init = lowpan_dev_init,
+ .ndo_start_xmit = lowpan_xmit,
+};
+
+static struct ieee802154_mlme_ops lowpan_mlme = {
+ .get_pan_id = lowpan_get_pan_id,
+ .get_short_addr = lowpan_get_short_addr,
+ .get_dsn = lowpan_get_dsn,
+};
+
+static void lowpan_setup(struct net_device *dev)
+{
+ dev->addr_len = IEEE802154_ADDR_LEN;
+ memset(dev->broadcast, 0xff, IEEE802154_ADDR_LEN);
+ dev->type = ARPHRD_IEEE802154;
+ /* Frame Control + Sequence Number + Address fields + Security Header */
+ dev->hard_header_len = 2 + 1 + 20 + 14;
+ dev->needed_tailroom = 2; /* FCS */
+ dev->mtu = IPV6_MIN_MTU;
+ dev->tx_queue_len = 0;
+ dev->flags = IFF_BROADCAST | IFF_MULTICAST;
+ dev->watchdog_timeo = 0;
+
+ dev->netdev_ops = &lowpan_netdev_ops;
+ dev->header_ops = &lowpan_header_ops;
+ dev->ml_priv = &lowpan_mlme;
+ dev->destructor = free_netdev;
+}
+
+static int lowpan_validate(struct nlattr *tb[], struct nlattr *data[])
+{
+ if (tb[IFLA_ADDRESS]) {
+ if (nla_len(tb[IFLA_ADDRESS]) != IEEE802154_ADDR_LEN)
+ return -EINVAL;
+ }
+ return 0;
+}
+
+static int lowpan_rcv(struct sk_buff *skb, struct net_device *dev,
+ struct packet_type *pt, struct net_device *orig_dev)
+{
+ struct ieee802154_hdr hdr;
+ int ret;
+
+ skb = skb_share_check(skb, GFP_ATOMIC);
+ if (!skb)
+ goto drop;
+
+ if (!netif_running(dev))
+ goto drop_skb;
+
+ if (skb->pkt_type == PACKET_OTHERHOST)
+ goto drop_skb;
+
+ if (dev->type != ARPHRD_IEEE802154)
+ goto drop_skb;
+
+ if (ieee802154_hdr_peek_addrs(skb, &hdr) < 0)
+ goto drop_skb;
+
+ /* check that it's our buffer */
+ if (skb->data[0] == LOWPAN_DISPATCH_IPV6) {
+ /* Pull off the 1-byte of 6lowpan header. */
+ skb_pull(skb, 1);
+ return lowpan_give_skb_to_devices(skb, NULL);
+ } else {
+ switch (skb->data[0] & 0xe0) {
+ case LOWPAN_DISPATCH_IPHC: /* ipv6 datagram */
+ ret = iphc_decompress(skb, &hdr);
+ if (ret < 0)
+ goto drop_skb;
+
+ return lowpan_give_skb_to_devices(skb, NULL);
+ case LOWPAN_DISPATCH_FRAG1: /* first fragment header */
+ ret = lowpan_frag_rcv(skb, LOWPAN_DISPATCH_FRAG1);
+ if (ret == 1) {
+ ret = iphc_decompress(skb, &hdr);
+ if (ret < 0)
+ goto drop_skb;
+
+ return lowpan_give_skb_to_devices(skb, NULL);
+ } else if (ret == -1) {
+ return NET_RX_DROP;
+ } else {
+ return NET_RX_SUCCESS;
+ }
+ case LOWPAN_DISPATCH_FRAGN: /* next fragments headers */
+ ret = lowpan_frag_rcv(skb, LOWPAN_DISPATCH_FRAGN);
+ if (ret == 1) {
+ ret = iphc_decompress(skb, &hdr);
+ if (ret < 0)
+ goto drop_skb;
+
+ return lowpan_give_skb_to_devices(skb, NULL);
+ } else if (ret == -1) {
+ return NET_RX_DROP;
+ } else {
+ return NET_RX_SUCCESS;
+ }
+ default:
+ break;
+ }
+ }
+
+drop_skb:
+ kfree_skb(skb);
+drop:
+ return NET_RX_DROP;
+}
+
+static struct packet_type lowpan_packet_type = {
+ .type = htons(ETH_P_IEEE802154),
+ .func = lowpan_rcv,
+};
+
+static int lowpan_newlink(struct net *src_net, struct net_device *dev,
+ struct nlattr *tb[], struct nlattr *data[])
+{
+ struct net_device *real_dev;
+ struct lowpan_dev_record *entry;
+ int ret;
+
+ ASSERT_RTNL();
+
+ pr_debug("adding new link\n");
+
+ if (!tb[IFLA_LINK])
+ return -EINVAL;
+ /* find and hold real wpan device */
+ real_dev = dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
+ if (!real_dev)
+ return -ENODEV;
+ if (real_dev->type != ARPHRD_IEEE802154) {
+ dev_put(real_dev);
+ return -EINVAL;
+ }
+
+ lowpan_dev_info(dev)->real_dev = real_dev;
+ mutex_init(&lowpan_dev_info(dev)->dev_list_mtx);
+
+ entry = kzalloc(sizeof(*entry), GFP_KERNEL);
+ if (!entry) {
+ dev_put(real_dev);
+ lowpan_dev_info(dev)->real_dev = NULL;
+ return -ENOMEM;
+ }
+
+ entry->ldev = dev;
+
+ /* Set the lowpan hardware address to the wpan hardware address. */
+ memcpy(dev->dev_addr, real_dev->dev_addr, IEEE802154_ADDR_LEN);
+
+ mutex_lock(&lowpan_dev_info(dev)->dev_list_mtx);
+ INIT_LIST_HEAD(&entry->list);
+ list_add_tail(&entry->list, &lowpan_devices);
+ mutex_unlock(&lowpan_dev_info(dev)->dev_list_mtx);
+
+ ret = register_netdevice(dev);
+ if (ret >= 0) {
+ if (!lowpan_open_count)
+ dev_add_pack(&lowpan_packet_type);
+ lowpan_open_count++;
+ }
+
+ return ret;
+}
+
+static void lowpan_dellink(struct net_device *dev, struct list_head *head)
+{
+ struct lowpan_dev_info *lowpan_dev = lowpan_dev_info(dev);
+ struct net_device *real_dev = lowpan_dev->real_dev;
+ struct lowpan_dev_record *entry, *tmp;
+
+ ASSERT_RTNL();
+
+ lowpan_open_count--;
+ if (!lowpan_open_count)
+ dev_remove_pack(&lowpan_packet_type);
+
+ mutex_lock(&lowpan_dev_info(dev)->dev_list_mtx);
+ list_for_each_entry_safe(entry, tmp, &lowpan_devices, list) {
+ if (entry->ldev == dev) {
+ list_del(&entry->list);
+ kfree(entry);
+ }
+ }
+ mutex_unlock(&lowpan_dev_info(dev)->dev_list_mtx);
+
+ mutex_destroy(&lowpan_dev_info(dev)->dev_list_mtx);
+
+ unregister_netdevice_queue(dev, head);
+
+ dev_put(real_dev);
+}
+
+static struct rtnl_link_ops lowpan_link_ops __read_mostly = {
+ .kind = "lowpan",
+ .priv_size = sizeof(struct lowpan_dev_info),
+ .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 *dev = netdev_notifier_info_to_dev(ptr);
+ LIST_HEAD(del_list);
+ struct lowpan_dev_record *entry, *tmp;
+
+ if (dev->type != ARPHRD_IEEE802154)
+ goto out;
+
+ if (event == NETDEV_UNREGISTER) {
+ list_for_each_entry_safe(entry, tmp, &lowpan_devices, list) {
+ if (lowpan_dev_info(entry->ldev)->real_dev == dev)
+ lowpan_dellink(entry->ldev, &del_list);
+ }
+
+ unregister_netdevice_many(&del_list);
+ }
+
+out:
+ return NOTIFY_DONE;
+}
+
+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");
--- /dev/null
+config IEEE802154_6LOWPAN
+ tristate "6lowpan support over IEEE 802.15.4"
+ depends on 6LOWPAN
+ ---help---
+ IPv6 compression over IEEE 802.15.4.
--- /dev/null
+obj-y += ieee802154_6lowpan.o
+
+ieee802154_6lowpan-y := 6lowpan_rtnl.o reassembly.o
--- /dev/null
+/* 6LoWPAN fragment reassembly
+ *
+ *
+ * Authors:
+ * Alexander Aring <aar@pengutronix.de>
+ *
+ * Based on: net/ipv6/reassembly.c
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#define pr_fmt(fmt) "6LoWPAN: " fmt
+
+#include <linux/net.h>
+#include <linux/list.h>
+#include <linux/netdevice.h>
+#include <linux/random.h>
+#include <linux/jhash.h>
+#include <linux/skbuff.h>
+#include <linux/slab.h>
+#include <linux/export.h>
+
+#include <net/ieee802154_netdev.h>
+#include <net/6lowpan.h>
+#include <net/ipv6.h>
+#include <net/inet_frag.h>
+
+#include "reassembly.h"
+
+static const char lowpan_frags_cache_name[] = "lowpan-frags";
+
+struct lowpan_frag_info {
+ u16 d_tag;
+ u16 d_size;
+ u8 d_offset;
+};
+
+static struct lowpan_frag_info *lowpan_cb(struct sk_buff *skb)
+{
+ return (struct lowpan_frag_info *)skb->cb;
+}
+
+static struct inet_frags lowpan_frags;
+
+static int lowpan_frag_reasm(struct lowpan_frag_queue *fq,
+ struct sk_buff *prev, struct net_device *dev);
+
+static unsigned int lowpan_hash_frag(u16 tag, u16 d_size,
+ const struct ieee802154_addr *saddr,
+ const struct ieee802154_addr *daddr)
+{
+ net_get_random_once(&lowpan_frags.rnd, sizeof(lowpan_frags.rnd));
+ return jhash_3words(ieee802154_addr_hash(saddr),
+ ieee802154_addr_hash(daddr),
+ (__force u32)(tag + (d_size << 16)),
+ lowpan_frags.rnd);
+}
+
+static unsigned int lowpan_hashfn(const struct inet_frag_queue *q)
+{
+ const struct lowpan_frag_queue *fq;
+
+ fq = container_of(q, struct lowpan_frag_queue, q);
+ return lowpan_hash_frag(fq->tag, fq->d_size, &fq->saddr, &fq->daddr);
+}
+
+static bool lowpan_frag_match(const struct inet_frag_queue *q, const void *a)
+{
+ const struct lowpan_frag_queue *fq;
+ const struct lowpan_create_arg *arg = a;
+
+ fq = container_of(q, struct lowpan_frag_queue, q);
+ return fq->tag == arg->tag && fq->d_size == arg->d_size &&
+ ieee802154_addr_equal(&fq->saddr, arg->src) &&
+ ieee802154_addr_equal(&fq->daddr, arg->dst);
+}
+
+static void lowpan_frag_init(struct inet_frag_queue *q, const void *a)
+{
+ const struct lowpan_create_arg *arg = a;
+ struct lowpan_frag_queue *fq;
+
+ fq = container_of(q, struct lowpan_frag_queue, q);
+
+ fq->tag = arg->tag;
+ fq->d_size = arg->d_size;
+ fq->saddr = *arg->src;
+ fq->daddr = *arg->dst;
+}
+
+static void lowpan_frag_expire(unsigned long data)
+{
+ struct frag_queue *fq;
+ struct net *net;
+
+ fq = container_of((struct inet_frag_queue *)data, struct frag_queue, q);
+ net = container_of(fq->q.net, struct net, ieee802154_lowpan.frags);
+
+ spin_lock(&fq->q.lock);
+
+ if (fq->q.flags & INET_FRAG_COMPLETE)
+ goto out;
+
+ inet_frag_kill(&fq->q, &lowpan_frags);
+out:
+ spin_unlock(&fq->q.lock);
+ inet_frag_put(&fq->q, &lowpan_frags);
+}
+
+static inline struct lowpan_frag_queue *
+fq_find(struct net *net, const struct lowpan_frag_info *frag_info,
+ const struct ieee802154_addr *src,
+ const struct ieee802154_addr *dst)
+{
+ struct inet_frag_queue *q;
+ struct lowpan_create_arg arg;
+ unsigned int hash;
+ struct netns_ieee802154_lowpan *ieee802154_lowpan =
+ net_ieee802154_lowpan(net);
+
+ arg.tag = frag_info->d_tag;
+ arg.d_size = frag_info->d_size;
+ arg.src = src;
+ arg.dst = dst;
+
+ hash = lowpan_hash_frag(frag_info->d_tag, frag_info->d_size, src, dst);
+
+ q = inet_frag_find(&ieee802154_lowpan->frags,
+ &lowpan_frags, &arg, hash);
+ if (IS_ERR_OR_NULL(q)) {
+ inet_frag_maybe_warn_overflow(q, pr_fmt());
+ return NULL;
+ }
+ return container_of(q, struct lowpan_frag_queue, q);
+}
+
+static int lowpan_frag_queue(struct lowpan_frag_queue *fq,
+ struct sk_buff *skb, const u8 frag_type)
+{
+ struct sk_buff *prev, *next;
+ struct net_device *dev;
+ int end, offset;
+
+ if (fq->q.flags & INET_FRAG_COMPLETE)
+ goto err;
+
+ offset = lowpan_cb(skb)->d_offset << 3;
+ end = lowpan_cb(skb)->d_size;
+
+ /* Is this the final fragment? */
+ if (offset + skb->len == end) {
+ /* If we already have some bits beyond end
+ * or have different end, the segment is corrupted.
+ */
+ if (end < fq->q.len ||
+ ((fq->q.flags & INET_FRAG_LAST_IN) && end != fq->q.len))
+ goto err;
+ fq->q.flags |= INET_FRAG_LAST_IN;
+ fq->q.len = end;
+ } else {
+ if (end > fq->q.len) {
+ /* Some bits beyond end -> corruption. */
+ if (fq->q.flags & INET_FRAG_LAST_IN)
+ goto err;
+ fq->q.len = end;
+ }
+ }
+
+ /* Find out which fragments are in front and at the back of us
+ * in the chain of fragments so far. We must know where to put
+ * this fragment, right?
+ */
+ prev = fq->q.fragments_tail;
+ if (!prev || lowpan_cb(prev)->d_offset < lowpan_cb(skb)->d_offset) {
+ next = NULL;
+ goto found;
+ }
+ prev = NULL;
+ for (next = fq->q.fragments; next != NULL; next = next->next) {
+ if (lowpan_cb(next)->d_offset >= lowpan_cb(skb)->d_offset)
+ break; /* bingo! */
+ prev = next;
+ }
+
+found:
+ /* Insert this fragment in the chain of fragments. */
+ skb->next = next;
+ if (!next)
+ fq->q.fragments_tail = skb;
+ if (prev)
+ prev->next = skb;
+ else
+ fq->q.fragments = skb;
+
+ dev = skb->dev;
+ if (dev)
+ skb->dev = NULL;
+
+ fq->q.stamp = skb->tstamp;
+ if (frag_type == LOWPAN_DISPATCH_FRAG1) {
+ /* Calculate uncomp. 6lowpan header to estimate full size */
+ fq->q.meat += lowpan_uncompress_size(skb, NULL);
+ fq->q.flags |= INET_FRAG_FIRST_IN;
+ } else {
+ fq->q.meat += skb->len;
+ }
+ add_frag_mem_limit(&fq->q, skb->truesize);
+
+ if (fq->q.flags == (INET_FRAG_FIRST_IN | INET_FRAG_LAST_IN) &&
+ fq->q.meat == fq->q.len) {
+ int res;
+ unsigned long orefdst = skb->_skb_refdst;
+
+ skb->_skb_refdst = 0UL;
+ res = lowpan_frag_reasm(fq, prev, dev);
+ skb->_skb_refdst = orefdst;
+ return res;
+ }
+
+ return -1;
+err:
+ kfree_skb(skb);
+ return -1;
+}
+
+/* Check if this packet is complete.
+ * Returns NULL on failure by any reason, and pointer
+ * to current nexthdr field in reassembled frame.
+ *
+ * It is called with locked fq, and caller must check that
+ * queue is eligible for reassembly i.e. it is not COMPLETE,
+ * the last and the first frames arrived and all the bits are here.
+ */
+static int lowpan_frag_reasm(struct lowpan_frag_queue *fq, struct sk_buff *prev,
+ struct net_device *dev)
+{
+ struct sk_buff *fp, *head = fq->q.fragments;
+ int sum_truesize;
+
+ inet_frag_kill(&fq->q, &lowpan_frags);
+
+ /* Make the one we just received the head. */
+ if (prev) {
+ head = prev->next;
+ fp = skb_clone(head, GFP_ATOMIC);
+
+ if (!fp)
+ goto out_oom;
+
+ fp->next = head->next;
+ if (!fp->next)
+ fq->q.fragments_tail = fp;
+ prev->next = fp;
+
+ skb_morph(head, fq->q.fragments);
+ head->next = fq->q.fragments->next;
+
+ consume_skb(fq->q.fragments);
+ fq->q.fragments = head;
+ }
+
+ /* Head of list must not be cloned. */
+ if (skb_unclone(head, GFP_ATOMIC))
+ goto out_oom;
+
+ /* If the first fragment is fragmented itself, we split
+ * it to two chunks: the first with data and paged part
+ * and the second, holding only fragments.
+ */
+ if (skb_has_frag_list(head)) {
+ struct sk_buff *clone;
+ int i, plen = 0;
+
+ clone = alloc_skb(0, GFP_ATOMIC);
+ if (!clone)
+ goto out_oom;
+ clone->next = head->next;
+ head->next = clone;
+ skb_shinfo(clone)->frag_list = skb_shinfo(head)->frag_list;
+ skb_frag_list_init(head);
+ for (i = 0; i < skb_shinfo(head)->nr_frags; i++)
+ plen += skb_frag_size(&skb_shinfo(head)->frags[i]);
+ clone->len = head->data_len - plen;
+ clone->data_len = clone->len;
+ head->data_len -= clone->len;
+ head->len -= clone->len;
+ add_frag_mem_limit(&fq->q, clone->truesize);
+ }
+
+ WARN_ON(head == NULL);
+
+ sum_truesize = head->truesize;
+ for (fp = head->next; fp;) {
+ bool headstolen;
+ int delta;
+ struct sk_buff *next = fp->next;
+
+ sum_truesize += fp->truesize;
+ if (skb_try_coalesce(head, fp, &headstolen, &delta)) {
+ kfree_skb_partial(fp, headstolen);
+ } else {
+ if (!skb_shinfo(head)->frag_list)
+ skb_shinfo(head)->frag_list = fp;
+ head->data_len += fp->len;
+ head->len += fp->len;
+ head->truesize += fp->truesize;
+ }
+ fp = next;
+ }
+ sub_frag_mem_limit(&fq->q, sum_truesize);
+
+ head->next = NULL;
+ head->dev = dev;
+ head->tstamp = fq->q.stamp;
+
+ fq->q.fragments = NULL;
+ fq->q.fragments_tail = NULL;
+
+ return 1;
+out_oom:
+ net_dbg_ratelimited("lowpan_frag_reasm: no memory for reassembly\n");
+ return -1;
+}
+
+static int lowpan_get_frag_info(struct sk_buff *skb, const u8 frag_type,
+ struct lowpan_frag_info *frag_info)
+{
+ bool fail;
+ u8 pattern = 0, low = 0;
+ __be16 d_tag = 0;
+
+ fail = lowpan_fetch_skb(skb, &pattern, 1);
+ fail |= lowpan_fetch_skb(skb, &low, 1);
+ frag_info->d_size = (pattern & 7) << 8 | low;
+ fail |= lowpan_fetch_skb(skb, &d_tag, 2);
+ frag_info->d_tag = ntohs(d_tag);
+
+ if (frag_type == LOWPAN_DISPATCH_FRAGN) {
+ fail |= lowpan_fetch_skb(skb, &frag_info->d_offset, 1);
+ } else {
+ skb_reset_network_header(skb);
+ frag_info->d_offset = 0;
+ }
+
+ if (unlikely(fail))
+ return -EIO;
+
+ return 0;
+}
+
+int lowpan_frag_rcv(struct sk_buff *skb, const u8 frag_type)
+{
+ struct lowpan_frag_queue *fq;
+ struct net *net = dev_net(skb->dev);
+ struct lowpan_frag_info *frag_info = lowpan_cb(skb);
+ struct ieee802154_addr source, dest;
+ int err;
+
+ source = mac_cb(skb)->source;
+ dest = mac_cb(skb)->dest;
+
+ err = lowpan_get_frag_info(skb, frag_type, frag_info);
+ if (err < 0)
+ goto err;
+
+ if (frag_info->d_size > IPV6_MIN_MTU) {
+ net_warn_ratelimited("lowpan_frag_rcv: datagram size exceeds MTU\n");
+ goto err;
+ }
+
+ fq = fq_find(net, frag_info, &source, &dest);
+ if (fq != NULL) {
+ int ret;
+
+ spin_lock(&fq->q.lock);
+ ret = lowpan_frag_queue(fq, skb, frag_type);
+ spin_unlock(&fq->q.lock);
+
+ inet_frag_put(&fq->q, &lowpan_frags);
+ return ret;
+ }
+
+err:
+ kfree_skb(skb);
+ return -1;
+}
+EXPORT_SYMBOL(lowpan_frag_rcv);
+
+#ifdef CONFIG_SYSCTL
+static int zero;
+
+static struct ctl_table lowpan_frags_ns_ctl_table[] = {
+ {
+ .procname = "6lowpanfrag_high_thresh",
+ .data = &init_net.ieee802154_lowpan.frags.high_thresh,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = &init_net.ieee802154_lowpan.frags.low_thresh
+ },
+ {
+ .procname = "6lowpanfrag_low_thresh",
+ .data = &init_net.ieee802154_lowpan.frags.low_thresh,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = &zero,
+ .extra2 = &init_net.ieee802154_lowpan.frags.high_thresh
+ },
+ {
+ .procname = "6lowpanfrag_time",
+ .data = &init_net.ieee802154_lowpan.frags.timeout,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_jiffies,
+ },
+ { }
+};
+
+/* secret interval has been deprecated */
+static int lowpan_frags_secret_interval_unused;
+static struct ctl_table lowpan_frags_ctl_table[] = {
+ {
+ .procname = "6lowpanfrag_secret_interval",
+ .data = &lowpan_frags_secret_interval_unused,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_jiffies,
+ },
+ { }
+};
+
+static int __net_init lowpan_frags_ns_sysctl_register(struct net *net)
+{
+ struct ctl_table *table;
+ struct ctl_table_header *hdr;
+ struct netns_ieee802154_lowpan *ieee802154_lowpan =
+ net_ieee802154_lowpan(net);
+
+ table = lowpan_frags_ns_ctl_table;
+ if (!net_eq(net, &init_net)) {
+ table = kmemdup(table, sizeof(lowpan_frags_ns_ctl_table),
+ GFP_KERNEL);
+ if (table == NULL)
+ goto err_alloc;
+
+ table[0].data = &ieee802154_lowpan->frags.high_thresh;
+ table[0].extra1 = &ieee802154_lowpan->frags.low_thresh;
+ table[0].extra2 = &init_net.ieee802154_lowpan.frags.high_thresh;
+ table[1].data = &ieee802154_lowpan->frags.low_thresh;
+ table[1].extra2 = &ieee802154_lowpan->frags.high_thresh;
+ table[2].data = &ieee802154_lowpan->frags.timeout;
+
+ /* Don't export sysctls to unprivileged users */
+ if (net->user_ns != &init_user_ns)
+ table[0].procname = NULL;
+ }
+
+ hdr = register_net_sysctl(net, "net/ieee802154/6lowpan", table);
+ if (hdr == NULL)
+ goto err_reg;
+
+ ieee802154_lowpan->sysctl.frags_hdr = hdr;
+ return 0;
+
+err_reg:
+ if (!net_eq(net, &init_net))
+ kfree(table);
+err_alloc:
+ return -ENOMEM;
+}
+
+static void __net_exit lowpan_frags_ns_sysctl_unregister(struct net *net)
+{
+ struct ctl_table *table;
+ struct netns_ieee802154_lowpan *ieee802154_lowpan =
+ net_ieee802154_lowpan(net);
+
+ table = ieee802154_lowpan->sysctl.frags_hdr->ctl_table_arg;
+ unregister_net_sysctl_table(ieee802154_lowpan->sysctl.frags_hdr);
+ if (!net_eq(net, &init_net))
+ kfree(table);
+}
+
+static struct ctl_table_header *lowpan_ctl_header;
+
+static int __init lowpan_frags_sysctl_register(void)
+{
+ lowpan_ctl_header = register_net_sysctl(&init_net,
+ "net/ieee802154/6lowpan",
+ lowpan_frags_ctl_table);
+ return lowpan_ctl_header == NULL ? -ENOMEM : 0;
+}
+
+static void lowpan_frags_sysctl_unregister(void)
+{
+ unregister_net_sysctl_table(lowpan_ctl_header);
+}
+#else
+static inline int lowpan_frags_ns_sysctl_register(struct net *net)
+{
+ return 0;
+}
+
+static inline void lowpan_frags_ns_sysctl_unregister(struct net *net)
+{
+}
+
+static inline int __init lowpan_frags_sysctl_register(void)
+{
+ return 0;
+}
+
+static inline void lowpan_frags_sysctl_unregister(void)
+{
+}
+#endif
+
+static int __net_init lowpan_frags_init_net(struct net *net)
+{
+ struct netns_ieee802154_lowpan *ieee802154_lowpan =
+ net_ieee802154_lowpan(net);
+
+ ieee802154_lowpan->frags.high_thresh = IPV6_FRAG_HIGH_THRESH;
+ ieee802154_lowpan->frags.low_thresh = IPV6_FRAG_LOW_THRESH;
+ ieee802154_lowpan->frags.timeout = IPV6_FRAG_TIMEOUT;
+
+ inet_frags_init_net(&ieee802154_lowpan->frags);
+
+ return lowpan_frags_ns_sysctl_register(net);
+}
+
+static void __net_exit lowpan_frags_exit_net(struct net *net)
+{
+ struct netns_ieee802154_lowpan *ieee802154_lowpan =
+ net_ieee802154_lowpan(net);
+
+ lowpan_frags_ns_sysctl_unregister(net);
+ inet_frags_exit_net(&ieee802154_lowpan->frags, &lowpan_frags);
+}
+
+static struct pernet_operations lowpan_frags_ops = {
+ .init = lowpan_frags_init_net,
+ .exit = lowpan_frags_exit_net,
+};
+
+int __init lowpan_net_frag_init(void)
+{
+ int ret;
+
+ ret = lowpan_frags_sysctl_register();
+ if (ret)
+ return ret;
+
+ ret = register_pernet_subsys(&lowpan_frags_ops);
+ if (ret)
+ goto err_pernet;
+
+ lowpan_frags.hashfn = lowpan_hashfn;
+ lowpan_frags.constructor = lowpan_frag_init;
+ lowpan_frags.destructor = NULL;
+ lowpan_frags.skb_free = NULL;
+ lowpan_frags.qsize = sizeof(struct frag_queue);
+ lowpan_frags.match = lowpan_frag_match;
+ lowpan_frags.frag_expire = lowpan_frag_expire;
+ lowpan_frags.frags_cache_name = lowpan_frags_cache_name;
+ ret = inet_frags_init(&lowpan_frags);
+ if (ret)
+ goto err_pernet;
+
+ return ret;
+err_pernet:
+ lowpan_frags_sysctl_unregister();
+ return ret;
+}
+
+void lowpan_net_frag_exit(void)
+{
+ inet_frags_fini(&lowpan_frags);
+ lowpan_frags_sysctl_unregister();
+ unregister_pernet_subsys(&lowpan_frags_ops);
+}
--- /dev/null
+#ifndef __IEEE802154_6LOWPAN_REASSEMBLY_H__
+#define __IEEE802154_6LOWPAN_REASSEMBLY_H__
+
+#include <net/inet_frag.h>
+
+struct lowpan_create_arg {
+ u16 tag;
+ u16 d_size;
+ const struct ieee802154_addr *src;
+ const struct ieee802154_addr *dst;
+};
+
+/* Equivalent of ipv4 struct ip
+ */
+struct lowpan_frag_queue {
+ struct inet_frag_queue q;
+
+ u16 tag;
+ u16 d_size;
+ struct ieee802154_addr saddr;
+ struct ieee802154_addr daddr;
+};
+
+static inline u32 ieee802154_addr_hash(const struct ieee802154_addr *a)
+{
+ switch (a->mode) {
+ case IEEE802154_ADDR_LONG:
+ return (((__force u64)a->extended_addr) >> 32) ^
+ (((__force u64)a->extended_addr) & 0xffffffff);
+ case IEEE802154_ADDR_SHORT:
+ return (__force u32)(a->short_addr);
+ default:
+ return 0;
+ }
+}
+
+int lowpan_frag_rcv(struct sk_buff *skb, const u8 frag_type);
+void lowpan_net_frag_exit(void);
+int lowpan_net_frag_init(void);
+
+#endif /* __IEEE802154_6LOWPAN_REASSEMBLY_H__ */
+++ /dev/null
-/* 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/bitops.h>
-#include <linux/if_arp.h>
-#include <linux/module.h>
-#include <linux/moduleparam.h>
-#include <linux/netdevice.h>
-#include <linux/ieee802154.h>
-#include <net/af_ieee802154.h>
-#include <net/ieee802154_netdev.h>
-#include <net/6lowpan.h>
-#include <net/ipv6.h>
-
-#include "reassembly.h"
-
-static LIST_HEAD(lowpan_devices);
-static int lowpan_open_count;
-
-/* private device info */
-struct lowpan_dev_info {
- struct net_device *real_dev; /* real WPAN device ptr */
- struct mutex dev_list_mtx; /* mutex for list ops */
- u16 fragment_tag;
-};
-
-struct lowpan_dev_record {
- struct net_device *ldev;
- struct list_head list;
-};
-
-/* don't save pan id, it's intra pan */
-struct lowpan_addr {
- u8 mode;
- union {
- /* IPv6 needs big endian here */
- __be64 extended_addr;
- __be16 short_addr;
- } u;
-};
-
-struct lowpan_addr_info {
- struct lowpan_addr daddr;
- struct lowpan_addr saddr;
-};
-
-static inline struct
-lowpan_dev_info *lowpan_dev_info(const struct net_device *dev)
-{
- return netdev_priv(dev);
-}
-
-static inline struct
-lowpan_addr_info *lowpan_skb_priv(const struct sk_buff *skb)
-{
- WARN_ON_ONCE(skb_headroom(skb) < sizeof(struct lowpan_addr_info));
- return (struct lowpan_addr_info *)(skb->data -
- sizeof(struct lowpan_addr_info));
-}
-
-static int lowpan_header_create(struct sk_buff *skb, struct net_device *dev,
- unsigned short type, const void *_daddr,
- const void *_saddr, unsigned int len)
-{
- const u8 *saddr = _saddr;
- const u8 *daddr = _daddr;
- struct lowpan_addr_info *info;
-
- /* TODO:
- * if this package isn't ipv6 one, where should it be routed?
- */
- if (type != ETH_P_IPV6)
- return 0;
-
- if (!saddr)
- saddr = dev->dev_addr;
-
- raw_dump_inline(__func__, "saddr", (unsigned char *)saddr, 8);
- raw_dump_inline(__func__, "daddr", (unsigned char *)daddr, 8);
-
- info = lowpan_skb_priv(skb);
-
- /* TODO: Currently we only support extended_addr */
- info->daddr.mode = IEEE802154_ADDR_LONG;
- memcpy(&info->daddr.u.extended_addr, daddr,
- sizeof(info->daddr.u.extended_addr));
- info->saddr.mode = IEEE802154_ADDR_LONG;
- memcpy(&info->saddr.u.extended_addr, saddr,
- sizeof(info->daddr.u.extended_addr));
-
- return 0;
-}
-
-static int lowpan_give_skb_to_devices(struct sk_buff *skb,
- struct net_device *dev)
-{
- struct lowpan_dev_record *entry;
- struct sk_buff *skb_cp;
- int stat = NET_RX_SUCCESS;
-
- skb->protocol = htons(ETH_P_IPV6);
- skb->pkt_type = PACKET_HOST;
-
- rcu_read_lock();
- list_for_each_entry_rcu(entry, &lowpan_devices, list)
- if (lowpan_dev_info(entry->ldev)->real_dev == skb->dev) {
- skb_cp = skb_copy(skb, GFP_ATOMIC);
- if (!skb_cp) {
- kfree_skb(skb);
- rcu_read_unlock();
- return NET_RX_DROP;
- }
-
- skb_cp->dev = entry->ldev;
- stat = netif_rx(skb_cp);
- if (stat == NET_RX_DROP)
- break;
- }
- rcu_read_unlock();
-
- consume_skb(skb);
-
- return stat;
-}
-
-static int
-iphc_decompress(struct sk_buff *skb, const struct ieee802154_hdr *hdr)
-{
- u8 iphc0, iphc1;
- struct ieee802154_addr_sa sa, da;
- void *sap, *dap;
-
- raw_dump_table(__func__, "raw skb data dump", skb->data, skb->len);
- /* at least two bytes will be used for the encoding */
- if (skb->len < 2)
- return -EINVAL;
-
- if (lowpan_fetch_skb_u8(skb, &iphc0))
- return -EINVAL;
-
- if (lowpan_fetch_skb_u8(skb, &iphc1))
- return -EINVAL;
-
- ieee802154_addr_to_sa(&sa, &hdr->source);
- ieee802154_addr_to_sa(&da, &hdr->dest);
-
- if (sa.addr_type == IEEE802154_ADDR_SHORT)
- sap = &sa.short_addr;
- else
- sap = &sa.hwaddr;
-
- if (da.addr_type == IEEE802154_ADDR_SHORT)
- dap = &da.short_addr;
- else
- dap = &da.hwaddr;
-
- return lowpan_header_decompress(skb, skb->dev, sap, sa.addr_type,
- IEEE802154_ADDR_LEN, dap, da.addr_type,
- IEEE802154_ADDR_LEN, iphc0, iphc1);
-}
-
-static struct sk_buff*
-lowpan_alloc_frag(struct sk_buff *skb, int size,
- const struct ieee802154_hdr *master_hdr)
-{
- struct net_device *real_dev = lowpan_dev_info(skb->dev)->real_dev;
- struct sk_buff *frag;
- int rc;
-
- frag = alloc_skb(real_dev->hard_header_len +
- real_dev->needed_tailroom + size,
- GFP_ATOMIC);
-
- if (likely(frag)) {
- frag->dev = real_dev;
- frag->priority = skb->priority;
- skb_reserve(frag, real_dev->hard_header_len);
- skb_reset_network_header(frag);
- *mac_cb(frag) = *mac_cb(skb);
-
- rc = dev_hard_header(frag, real_dev, 0, &master_hdr->dest,
- &master_hdr->source, size);
- if (rc < 0) {
- kfree_skb(frag);
- return ERR_PTR(rc);
- }
- } else {
- frag = ERR_PTR(-ENOMEM);
- }
-
- return frag;
-}
-
-static int
-lowpan_xmit_fragment(struct sk_buff *skb, const struct ieee802154_hdr *wpan_hdr,
- u8 *frag_hdr, int frag_hdrlen,
- int offset, int len)
-{
- struct sk_buff *frag;
-
- raw_dump_inline(__func__, " fragment header", frag_hdr, frag_hdrlen);
-
- frag = lowpan_alloc_frag(skb, frag_hdrlen + len, wpan_hdr);
- if (IS_ERR(frag))
- return -PTR_ERR(frag);
-
- memcpy(skb_put(frag, frag_hdrlen), frag_hdr, frag_hdrlen);
- memcpy(skb_put(frag, len), skb_network_header(skb) + offset, len);
-
- raw_dump_table(__func__, " fragment dump", frag->data, frag->len);
-
- return dev_queue_xmit(frag);
-}
-
-static int
-lowpan_xmit_fragmented(struct sk_buff *skb, struct net_device *dev,
- const struct ieee802154_hdr *wpan_hdr)
-{
- u16 dgram_size, dgram_offset;
- __be16 frag_tag;
- u8 frag_hdr[5];
- int frag_cap, frag_len, payload_cap, rc;
- int skb_unprocessed, skb_offset;
-
- dgram_size = lowpan_uncompress_size(skb, &dgram_offset) -
- skb->mac_len;
- frag_tag = htons(lowpan_dev_info(dev)->fragment_tag);
- lowpan_dev_info(dev)->fragment_tag++;
-
- frag_hdr[0] = LOWPAN_DISPATCH_FRAG1 | ((dgram_size >> 8) & 0x07);
- frag_hdr[1] = dgram_size & 0xff;
- memcpy(frag_hdr + 2, &frag_tag, sizeof(frag_tag));
-
- payload_cap = ieee802154_max_payload(wpan_hdr);
-
- frag_len = round_down(payload_cap - LOWPAN_FRAG1_HEAD_SIZE -
- skb_network_header_len(skb), 8);
-
- skb_offset = skb_network_header_len(skb);
- skb_unprocessed = skb->len - skb->mac_len - skb_offset;
-
- rc = lowpan_xmit_fragment(skb, wpan_hdr, frag_hdr,
- LOWPAN_FRAG1_HEAD_SIZE, 0,
- frag_len + skb_network_header_len(skb));
- if (rc) {
- pr_debug("%s unable to send FRAG1 packet (tag: %d)",
- __func__, ntohs(frag_tag));
- goto err;
- }
-
- frag_hdr[0] &= ~LOWPAN_DISPATCH_FRAG1;
- frag_hdr[0] |= LOWPAN_DISPATCH_FRAGN;
- frag_cap = round_down(payload_cap - LOWPAN_FRAGN_HEAD_SIZE, 8);
-
- do {
- dgram_offset += frag_len;
- skb_offset += frag_len;
- skb_unprocessed -= frag_len;
- frag_len = min(frag_cap, skb_unprocessed);
-
- frag_hdr[4] = dgram_offset >> 3;
-
- rc = lowpan_xmit_fragment(skb, wpan_hdr, frag_hdr,
- LOWPAN_FRAGN_HEAD_SIZE, skb_offset,
- frag_len);
- if (rc) {
- pr_debug("%s unable to send a FRAGN packet. (tag: %d, offset: %d)\n",
- __func__, ntohs(frag_tag), skb_offset);
- goto err;
- }
- } while (skb_unprocessed > frag_cap);
-
- consume_skb(skb);
- return NET_XMIT_SUCCESS;
-
-err:
- kfree_skb(skb);
- return rc;
-}
-
-static int lowpan_header(struct sk_buff *skb, struct net_device *dev)
-{
- struct ieee802154_addr sa, da;
- struct ieee802154_mac_cb *cb = mac_cb_init(skb);
- struct lowpan_addr_info info;
- void *daddr, *saddr;
-
- memcpy(&info, lowpan_skb_priv(skb), sizeof(info));
-
- /* TODO: Currently we only support extended_addr */
- daddr = &info.daddr.u.extended_addr;
- saddr = &info.saddr.u.extended_addr;
-
- lowpan_header_compress(skb, dev, ETH_P_IPV6, daddr, saddr, skb->len);
-
- cb->type = IEEE802154_FC_TYPE_DATA;
-
- /* prepare wpan address data */
- sa.mode = IEEE802154_ADDR_LONG;
- sa.pan_id = ieee802154_mlme_ops(dev)->get_pan_id(dev);
- sa.extended_addr = ieee802154_devaddr_from_raw(saddr);
-
- /* intra-PAN communications */
- da.pan_id = sa.pan_id;
-
- /* if the destination address is the broadcast address, use the
- * corresponding short address
- */
- if (lowpan_is_addr_broadcast((const u8 *)daddr)) {
- da.mode = IEEE802154_ADDR_SHORT;
- da.short_addr = cpu_to_le16(IEEE802154_ADDR_BROADCAST);
- cb->ackreq = false;
- } else {
- da.mode = IEEE802154_ADDR_LONG;
- da.extended_addr = ieee802154_devaddr_from_raw(daddr);
- cb->ackreq = true;
- }
-
- return dev_hard_header(skb, lowpan_dev_info(dev)->real_dev,
- ETH_P_IPV6, (void *)&da, (void *)&sa, 0);
-}
-
-static netdev_tx_t lowpan_xmit(struct sk_buff *skb, struct net_device *dev)
-{
- struct ieee802154_hdr wpan_hdr;
- int max_single, ret;
-
- pr_debug("package xmit\n");
-
- /* We must take a copy of the skb before we modify/replace the ipv6
- * header as the header could be used elsewhere
- */
- skb = skb_unshare(skb, GFP_ATOMIC);
- if (!skb)
- return NET_XMIT_DROP;
-
- ret = lowpan_header(skb, dev);
- if (ret < 0) {
- kfree_skb(skb);
- return NET_XMIT_DROP;
- }
-
- if (ieee802154_hdr_peek(skb, &wpan_hdr) < 0) {
- kfree_skb(skb);
- return NET_XMIT_DROP;
- }
-
- max_single = ieee802154_max_payload(&wpan_hdr);
-
- if (skb_tail_pointer(skb) - skb_network_header(skb) <= max_single) {
- skb->dev = lowpan_dev_info(dev)->real_dev;
- return dev_queue_xmit(skb);
- } else {
- netdev_tx_t rc;
-
- pr_debug("frame is too big, fragmentation is needed\n");
- rc = lowpan_xmit_fragmented(skb, dev, &wpan_hdr);
-
- return rc < 0 ? NET_XMIT_DROP : rc;
- }
-}
-
-static __le16 lowpan_get_pan_id(const struct net_device *dev)
-{
- struct net_device *real_dev = lowpan_dev_info(dev)->real_dev;
-
- return ieee802154_mlme_ops(real_dev)->get_pan_id(real_dev);
-}
-
-static __le16 lowpan_get_short_addr(const struct net_device *dev)
-{
- struct net_device *real_dev = lowpan_dev_info(dev)->real_dev;
-
- return ieee802154_mlme_ops(real_dev)->get_short_addr(real_dev);
-}
-
-static u8 lowpan_get_dsn(const struct net_device *dev)
-{
- struct net_device *real_dev = lowpan_dev_info(dev)->real_dev;
-
- return ieee802154_mlme_ops(real_dev)->get_dsn(real_dev);
-}
-
-static struct header_ops lowpan_header_ops = {
- .create = lowpan_header_create,
-};
-
-static struct lock_class_key lowpan_tx_busylock;
-static struct lock_class_key lowpan_netdev_xmit_lock_key;
-
-static void lowpan_set_lockdep_class_one(struct net_device *dev,
- struct netdev_queue *txq,
- void *_unused)
-{
- lockdep_set_class(&txq->_xmit_lock,
- &lowpan_netdev_xmit_lock_key);
-}
-
-static int lowpan_dev_init(struct net_device *dev)
-{
- netdev_for_each_tx_queue(dev, lowpan_set_lockdep_class_one, NULL);
- dev->qdisc_tx_busylock = &lowpan_tx_busylock;
- return 0;
-}
-
-static const struct net_device_ops lowpan_netdev_ops = {
- .ndo_init = lowpan_dev_init,
- .ndo_start_xmit = lowpan_xmit,
-};
-
-static struct ieee802154_mlme_ops lowpan_mlme = {
- .get_pan_id = lowpan_get_pan_id,
- .get_short_addr = lowpan_get_short_addr,
- .get_dsn = lowpan_get_dsn,
-};
-
-static void lowpan_setup(struct net_device *dev)
-{
- dev->addr_len = IEEE802154_ADDR_LEN;
- memset(dev->broadcast, 0xff, IEEE802154_ADDR_LEN);
- dev->type = ARPHRD_IEEE802154;
- /* Frame Control + Sequence Number + Address fields + Security Header */
- dev->hard_header_len = 2 + 1 + 20 + 14;
- dev->needed_tailroom = 2; /* FCS */
- dev->mtu = IPV6_MIN_MTU;
- dev->tx_queue_len = 0;
- dev->flags = IFF_BROADCAST | IFF_MULTICAST;
- dev->watchdog_timeo = 0;
-
- dev->netdev_ops = &lowpan_netdev_ops;
- dev->header_ops = &lowpan_header_ops;
- dev->ml_priv = &lowpan_mlme;
- dev->destructor = free_netdev;
-}
-
-static int lowpan_validate(struct nlattr *tb[], struct nlattr *data[])
-{
- if (tb[IFLA_ADDRESS]) {
- if (nla_len(tb[IFLA_ADDRESS]) != IEEE802154_ADDR_LEN)
- return -EINVAL;
- }
- return 0;
-}
-
-static int lowpan_rcv(struct sk_buff *skb, struct net_device *dev,
- struct packet_type *pt, struct net_device *orig_dev)
-{
- struct ieee802154_hdr hdr;
- int ret;
-
- skb = skb_share_check(skb, GFP_ATOMIC);
- if (!skb)
- goto drop;
-
- if (!netif_running(dev))
- goto drop_skb;
-
- if (skb->pkt_type == PACKET_OTHERHOST)
- goto drop_skb;
-
- if (dev->type != ARPHRD_IEEE802154)
- goto drop_skb;
-
- if (ieee802154_hdr_peek_addrs(skb, &hdr) < 0)
- goto drop_skb;
-
- /* check that it's our buffer */
- if (skb->data[0] == LOWPAN_DISPATCH_IPV6) {
- /* Pull off the 1-byte of 6lowpan header. */
- skb_pull(skb, 1);
- return lowpan_give_skb_to_devices(skb, NULL);
- } else {
- switch (skb->data[0] & 0xe0) {
- case LOWPAN_DISPATCH_IPHC: /* ipv6 datagram */
- ret = iphc_decompress(skb, &hdr);
- if (ret < 0)
- goto drop_skb;
-
- return lowpan_give_skb_to_devices(skb, NULL);
- case LOWPAN_DISPATCH_FRAG1: /* first fragment header */
- ret = lowpan_frag_rcv(skb, LOWPAN_DISPATCH_FRAG1);
- if (ret == 1) {
- ret = iphc_decompress(skb, &hdr);
- if (ret < 0)
- goto drop_skb;
-
- return lowpan_give_skb_to_devices(skb, NULL);
- } else if (ret == -1) {
- return NET_RX_DROP;
- } else {
- return NET_RX_SUCCESS;
- }
- case LOWPAN_DISPATCH_FRAGN: /* next fragments headers */
- ret = lowpan_frag_rcv(skb, LOWPAN_DISPATCH_FRAGN);
- if (ret == 1) {
- ret = iphc_decompress(skb, &hdr);
- if (ret < 0)
- goto drop_skb;
-
- return lowpan_give_skb_to_devices(skb, NULL);
- } else if (ret == -1) {
- return NET_RX_DROP;
- } else {
- return NET_RX_SUCCESS;
- }
- default:
- break;
- }
- }
-
-drop_skb:
- kfree_skb(skb);
-drop:
- return NET_RX_DROP;
-}
-
-static struct packet_type lowpan_packet_type = {
- .type = htons(ETH_P_IEEE802154),
- .func = lowpan_rcv,
-};
-
-static int lowpan_newlink(struct net *src_net, struct net_device *dev,
- struct nlattr *tb[], struct nlattr *data[])
-{
- struct net_device *real_dev;
- struct lowpan_dev_record *entry;
- int ret;
-
- ASSERT_RTNL();
-
- pr_debug("adding new link\n");
-
- if (!tb[IFLA_LINK])
- return -EINVAL;
- /* find and hold real wpan device */
- real_dev = dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
- if (!real_dev)
- return -ENODEV;
- if (real_dev->type != ARPHRD_IEEE802154) {
- dev_put(real_dev);
- return -EINVAL;
- }
-
- lowpan_dev_info(dev)->real_dev = real_dev;
- mutex_init(&lowpan_dev_info(dev)->dev_list_mtx);
-
- entry = kzalloc(sizeof(*entry), GFP_KERNEL);
- if (!entry) {
- dev_put(real_dev);
- lowpan_dev_info(dev)->real_dev = NULL;
- return -ENOMEM;
- }
-
- entry->ldev = dev;
-
- /* Set the lowpan hardware address to the wpan hardware address. */
- memcpy(dev->dev_addr, real_dev->dev_addr, IEEE802154_ADDR_LEN);
-
- mutex_lock(&lowpan_dev_info(dev)->dev_list_mtx);
- INIT_LIST_HEAD(&entry->list);
- list_add_tail(&entry->list, &lowpan_devices);
- mutex_unlock(&lowpan_dev_info(dev)->dev_list_mtx);
-
- ret = register_netdevice(dev);
- if (ret >= 0) {
- if (!lowpan_open_count)
- dev_add_pack(&lowpan_packet_type);
- lowpan_open_count++;
- }
-
- return ret;
-}
-
-static void lowpan_dellink(struct net_device *dev, struct list_head *head)
-{
- struct lowpan_dev_info *lowpan_dev = lowpan_dev_info(dev);
- struct net_device *real_dev = lowpan_dev->real_dev;
- struct lowpan_dev_record *entry, *tmp;
-
- ASSERT_RTNL();
-
- lowpan_open_count--;
- if (!lowpan_open_count)
- dev_remove_pack(&lowpan_packet_type);
-
- mutex_lock(&lowpan_dev_info(dev)->dev_list_mtx);
- list_for_each_entry_safe(entry, tmp, &lowpan_devices, list) {
- if (entry->ldev == dev) {
- list_del(&entry->list);
- kfree(entry);
- }
- }
- mutex_unlock(&lowpan_dev_info(dev)->dev_list_mtx);
-
- mutex_destroy(&lowpan_dev_info(dev)->dev_list_mtx);
-
- unregister_netdevice_queue(dev, head);
-
- dev_put(real_dev);
-}
-
-static struct rtnl_link_ops lowpan_link_ops __read_mostly = {
- .kind = "lowpan",
- .priv_size = sizeof(struct lowpan_dev_info),
- .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 *dev = netdev_notifier_info_to_dev(ptr);
- LIST_HEAD(del_list);
- struct lowpan_dev_record *entry, *tmp;
-
- if (dev->type != ARPHRD_IEEE802154)
- goto out;
-
- if (event == NETDEV_UNREGISTER) {
- list_for_each_entry_safe(entry, tmp, &lowpan_devices, list) {
- if (lowpan_dev_info(entry->ldev)->real_dev == dev)
- lowpan_dellink(entry->ldev, &del_list);
- }
-
- unregister_netdevice_many(&del_list);
- }
-
-out:
- return NOTIFY_DONE;
-}
-
-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");
for 802.15.4 dataframes. Also RAW socket interface to build MAC
header from userspace.
-config IEEE802154_6LOWPAN
- tristate "6lowpan support over IEEE 802.15.4"
- depends on 6LOWPAN
- ---help---
- IPv6 compression over IEEE 802.15.4.
+source "net/ieee802154/6lowpan/Kconfig"
endif
obj-$(CONFIG_IEEE802154) += ieee802154.o
obj-$(CONFIG_IEEE802154_SOCKET) += ieee802154_socket.o
-obj-$(CONFIG_IEEE802154_6LOWPAN) += ieee802154_6lowpan.o
+obj-$(CONFIG_IEEE802154_6LOWPAN) += 6lowpan/
-ieee802154_6lowpan-y := 6lowpan_rtnl.o reassembly.o
ieee802154-y := netlink.o nl-mac.o nl-phy.o nl_policy.o core.o \
header_ops.o sysfs.o nl802154.o
ieee802154_socket-y := socket.o
+++ /dev/null
-/* 6LoWPAN fragment reassembly
- *
- *
- * Authors:
- * Alexander Aring <aar@pengutronix.de>
- *
- * Based on: net/ipv6/reassembly.c
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
- */
-
-#define pr_fmt(fmt) "6LoWPAN: " fmt
-
-#include <linux/net.h>
-#include <linux/list.h>
-#include <linux/netdevice.h>
-#include <linux/random.h>
-#include <linux/jhash.h>
-#include <linux/skbuff.h>
-#include <linux/slab.h>
-#include <linux/export.h>
-
-#include <net/ieee802154_netdev.h>
-#include <net/6lowpan.h>
-#include <net/ipv6.h>
-#include <net/inet_frag.h>
-
-#include "reassembly.h"
-
-static const char lowpan_frags_cache_name[] = "lowpan-frags";
-
-struct lowpan_frag_info {
- u16 d_tag;
- u16 d_size;
- u8 d_offset;
-};
-
-static struct lowpan_frag_info *lowpan_cb(struct sk_buff *skb)
-{
- return (struct lowpan_frag_info *)skb->cb;
-}
-
-static struct inet_frags lowpan_frags;
-
-static int lowpan_frag_reasm(struct lowpan_frag_queue *fq,
- struct sk_buff *prev, struct net_device *dev);
-
-static unsigned int lowpan_hash_frag(u16 tag, u16 d_size,
- const struct ieee802154_addr *saddr,
- const struct ieee802154_addr *daddr)
-{
- net_get_random_once(&lowpan_frags.rnd, sizeof(lowpan_frags.rnd));
- return jhash_3words(ieee802154_addr_hash(saddr),
- ieee802154_addr_hash(daddr),
- (__force u32)(tag + (d_size << 16)),
- lowpan_frags.rnd);
-}
-
-static unsigned int lowpan_hashfn(const struct inet_frag_queue *q)
-{
- const struct lowpan_frag_queue *fq;
-
- fq = container_of(q, struct lowpan_frag_queue, q);
- return lowpan_hash_frag(fq->tag, fq->d_size, &fq->saddr, &fq->daddr);
-}
-
-static bool lowpan_frag_match(const struct inet_frag_queue *q, const void *a)
-{
- const struct lowpan_frag_queue *fq;
- const struct lowpan_create_arg *arg = a;
-
- fq = container_of(q, struct lowpan_frag_queue, q);
- return fq->tag == arg->tag && fq->d_size == arg->d_size &&
- ieee802154_addr_equal(&fq->saddr, arg->src) &&
- ieee802154_addr_equal(&fq->daddr, arg->dst);
-}
-
-static void lowpan_frag_init(struct inet_frag_queue *q, const void *a)
-{
- const struct lowpan_create_arg *arg = a;
- struct lowpan_frag_queue *fq;
-
- fq = container_of(q, struct lowpan_frag_queue, q);
-
- fq->tag = arg->tag;
- fq->d_size = arg->d_size;
- fq->saddr = *arg->src;
- fq->daddr = *arg->dst;
-}
-
-static void lowpan_frag_expire(unsigned long data)
-{
- struct frag_queue *fq;
- struct net *net;
-
- fq = container_of((struct inet_frag_queue *)data, struct frag_queue, q);
- net = container_of(fq->q.net, struct net, ieee802154_lowpan.frags);
-
- spin_lock(&fq->q.lock);
-
- if (fq->q.flags & INET_FRAG_COMPLETE)
- goto out;
-
- inet_frag_kill(&fq->q, &lowpan_frags);
-out:
- spin_unlock(&fq->q.lock);
- inet_frag_put(&fq->q, &lowpan_frags);
-}
-
-static inline struct lowpan_frag_queue *
-fq_find(struct net *net, const struct lowpan_frag_info *frag_info,
- const struct ieee802154_addr *src,
- const struct ieee802154_addr *dst)
-{
- struct inet_frag_queue *q;
- struct lowpan_create_arg arg;
- unsigned int hash;
- struct netns_ieee802154_lowpan *ieee802154_lowpan =
- net_ieee802154_lowpan(net);
-
- arg.tag = frag_info->d_tag;
- arg.d_size = frag_info->d_size;
- arg.src = src;
- arg.dst = dst;
-
- hash = lowpan_hash_frag(frag_info->d_tag, frag_info->d_size, src, dst);
-
- q = inet_frag_find(&ieee802154_lowpan->frags,
- &lowpan_frags, &arg, hash);
- if (IS_ERR_OR_NULL(q)) {
- inet_frag_maybe_warn_overflow(q, pr_fmt());
- return NULL;
- }
- return container_of(q, struct lowpan_frag_queue, q);
-}
-
-static int lowpan_frag_queue(struct lowpan_frag_queue *fq,
- struct sk_buff *skb, const u8 frag_type)
-{
- struct sk_buff *prev, *next;
- struct net_device *dev;
- int end, offset;
-
- if (fq->q.flags & INET_FRAG_COMPLETE)
- goto err;
-
- offset = lowpan_cb(skb)->d_offset << 3;
- end = lowpan_cb(skb)->d_size;
-
- /* Is this the final fragment? */
- if (offset + skb->len == end) {
- /* If we already have some bits beyond end
- * or have different end, the segment is corrupted.
- */
- if (end < fq->q.len ||
- ((fq->q.flags & INET_FRAG_LAST_IN) && end != fq->q.len))
- goto err;
- fq->q.flags |= INET_FRAG_LAST_IN;
- fq->q.len = end;
- } else {
- if (end > fq->q.len) {
- /* Some bits beyond end -> corruption. */
- if (fq->q.flags & INET_FRAG_LAST_IN)
- goto err;
- fq->q.len = end;
- }
- }
-
- /* Find out which fragments are in front and at the back of us
- * in the chain of fragments so far. We must know where to put
- * this fragment, right?
- */
- prev = fq->q.fragments_tail;
- if (!prev || lowpan_cb(prev)->d_offset < lowpan_cb(skb)->d_offset) {
- next = NULL;
- goto found;
- }
- prev = NULL;
- for (next = fq->q.fragments; next != NULL; next = next->next) {
- if (lowpan_cb(next)->d_offset >= lowpan_cb(skb)->d_offset)
- break; /* bingo! */
- prev = next;
- }
-
-found:
- /* Insert this fragment in the chain of fragments. */
- skb->next = next;
- if (!next)
- fq->q.fragments_tail = skb;
- if (prev)
- prev->next = skb;
- else
- fq->q.fragments = skb;
-
- dev = skb->dev;
- if (dev)
- skb->dev = NULL;
-
- fq->q.stamp = skb->tstamp;
- if (frag_type == LOWPAN_DISPATCH_FRAG1) {
- /* Calculate uncomp. 6lowpan header to estimate full size */
- fq->q.meat += lowpan_uncompress_size(skb, NULL);
- fq->q.flags |= INET_FRAG_FIRST_IN;
- } else {
- fq->q.meat += skb->len;
- }
- add_frag_mem_limit(&fq->q, skb->truesize);
-
- if (fq->q.flags == (INET_FRAG_FIRST_IN | INET_FRAG_LAST_IN) &&
- fq->q.meat == fq->q.len) {
- int res;
- unsigned long orefdst = skb->_skb_refdst;
-
- skb->_skb_refdst = 0UL;
- res = lowpan_frag_reasm(fq, prev, dev);
- skb->_skb_refdst = orefdst;
- return res;
- }
-
- return -1;
-err:
- kfree_skb(skb);
- return -1;
-}
-
-/* Check if this packet is complete.
- * Returns NULL on failure by any reason, and pointer
- * to current nexthdr field in reassembled frame.
- *
- * It is called with locked fq, and caller must check that
- * queue is eligible for reassembly i.e. it is not COMPLETE,
- * the last and the first frames arrived and all the bits are here.
- */
-static int lowpan_frag_reasm(struct lowpan_frag_queue *fq, struct sk_buff *prev,
- struct net_device *dev)
-{
- struct sk_buff *fp, *head = fq->q.fragments;
- int sum_truesize;
-
- inet_frag_kill(&fq->q, &lowpan_frags);
-
- /* Make the one we just received the head. */
- if (prev) {
- head = prev->next;
- fp = skb_clone(head, GFP_ATOMIC);
-
- if (!fp)
- goto out_oom;
-
- fp->next = head->next;
- if (!fp->next)
- fq->q.fragments_tail = fp;
- prev->next = fp;
-
- skb_morph(head, fq->q.fragments);
- head->next = fq->q.fragments->next;
-
- consume_skb(fq->q.fragments);
- fq->q.fragments = head;
- }
-
- /* Head of list must not be cloned. */
- if (skb_unclone(head, GFP_ATOMIC))
- goto out_oom;
-
- /* If the first fragment is fragmented itself, we split
- * it to two chunks: the first with data and paged part
- * and the second, holding only fragments.
- */
- if (skb_has_frag_list(head)) {
- struct sk_buff *clone;
- int i, plen = 0;
-
- clone = alloc_skb(0, GFP_ATOMIC);
- if (!clone)
- goto out_oom;
- clone->next = head->next;
- head->next = clone;
- skb_shinfo(clone)->frag_list = skb_shinfo(head)->frag_list;
- skb_frag_list_init(head);
- for (i = 0; i < skb_shinfo(head)->nr_frags; i++)
- plen += skb_frag_size(&skb_shinfo(head)->frags[i]);
- clone->len = head->data_len - plen;
- clone->data_len = clone->len;
- head->data_len -= clone->len;
- head->len -= clone->len;
- add_frag_mem_limit(&fq->q, clone->truesize);
- }
-
- WARN_ON(head == NULL);
-
- sum_truesize = head->truesize;
- for (fp = head->next; fp;) {
- bool headstolen;
- int delta;
- struct sk_buff *next = fp->next;
-
- sum_truesize += fp->truesize;
- if (skb_try_coalesce(head, fp, &headstolen, &delta)) {
- kfree_skb_partial(fp, headstolen);
- } else {
- if (!skb_shinfo(head)->frag_list)
- skb_shinfo(head)->frag_list = fp;
- head->data_len += fp->len;
- head->len += fp->len;
- head->truesize += fp->truesize;
- }
- fp = next;
- }
- sub_frag_mem_limit(&fq->q, sum_truesize);
-
- head->next = NULL;
- head->dev = dev;
- head->tstamp = fq->q.stamp;
-
- fq->q.fragments = NULL;
- fq->q.fragments_tail = NULL;
-
- return 1;
-out_oom:
- net_dbg_ratelimited("lowpan_frag_reasm: no memory for reassembly\n");
- return -1;
-}
-
-static int lowpan_get_frag_info(struct sk_buff *skb, const u8 frag_type,
- struct lowpan_frag_info *frag_info)
-{
- bool fail;
- u8 pattern = 0, low = 0;
- __be16 d_tag = 0;
-
- fail = lowpan_fetch_skb(skb, &pattern, 1);
- fail |= lowpan_fetch_skb(skb, &low, 1);
- frag_info->d_size = (pattern & 7) << 8 | low;
- fail |= lowpan_fetch_skb(skb, &d_tag, 2);
- frag_info->d_tag = ntohs(d_tag);
-
- if (frag_type == LOWPAN_DISPATCH_FRAGN) {
- fail |= lowpan_fetch_skb(skb, &frag_info->d_offset, 1);
- } else {
- skb_reset_network_header(skb);
- frag_info->d_offset = 0;
- }
-
- if (unlikely(fail))
- return -EIO;
-
- return 0;
-}
-
-int lowpan_frag_rcv(struct sk_buff *skb, const u8 frag_type)
-{
- struct lowpan_frag_queue *fq;
- struct net *net = dev_net(skb->dev);
- struct lowpan_frag_info *frag_info = lowpan_cb(skb);
- struct ieee802154_addr source, dest;
- int err;
-
- source = mac_cb(skb)->source;
- dest = mac_cb(skb)->dest;
-
- err = lowpan_get_frag_info(skb, frag_type, frag_info);
- if (err < 0)
- goto err;
-
- if (frag_info->d_size > IPV6_MIN_MTU) {
- net_warn_ratelimited("lowpan_frag_rcv: datagram size exceeds MTU\n");
- goto err;
- }
-
- fq = fq_find(net, frag_info, &source, &dest);
- if (fq != NULL) {
- int ret;
-
- spin_lock(&fq->q.lock);
- ret = lowpan_frag_queue(fq, skb, frag_type);
- spin_unlock(&fq->q.lock);
-
- inet_frag_put(&fq->q, &lowpan_frags);
- return ret;
- }
-
-err:
- kfree_skb(skb);
- return -1;
-}
-EXPORT_SYMBOL(lowpan_frag_rcv);
-
-#ifdef CONFIG_SYSCTL
-static int zero;
-
-static struct ctl_table lowpan_frags_ns_ctl_table[] = {
- {
- .procname = "6lowpanfrag_high_thresh",
- .data = &init_net.ieee802154_lowpan.frags.high_thresh,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec_minmax,
- .extra1 = &init_net.ieee802154_lowpan.frags.low_thresh
- },
- {
- .procname = "6lowpanfrag_low_thresh",
- .data = &init_net.ieee802154_lowpan.frags.low_thresh,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec_minmax,
- .extra1 = &zero,
- .extra2 = &init_net.ieee802154_lowpan.frags.high_thresh
- },
- {
- .procname = "6lowpanfrag_time",
- .data = &init_net.ieee802154_lowpan.frags.timeout,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec_jiffies,
- },
- { }
-};
-
-/* secret interval has been deprecated */
-static int lowpan_frags_secret_interval_unused;
-static struct ctl_table lowpan_frags_ctl_table[] = {
- {
- .procname = "6lowpanfrag_secret_interval",
- .data = &lowpan_frags_secret_interval_unused,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec_jiffies,
- },
- { }
-};
-
-static int __net_init lowpan_frags_ns_sysctl_register(struct net *net)
-{
- struct ctl_table *table;
- struct ctl_table_header *hdr;
- struct netns_ieee802154_lowpan *ieee802154_lowpan =
- net_ieee802154_lowpan(net);
-
- table = lowpan_frags_ns_ctl_table;
- if (!net_eq(net, &init_net)) {
- table = kmemdup(table, sizeof(lowpan_frags_ns_ctl_table),
- GFP_KERNEL);
- if (table == NULL)
- goto err_alloc;
-
- table[0].data = &ieee802154_lowpan->frags.high_thresh;
- table[0].extra1 = &ieee802154_lowpan->frags.low_thresh;
- table[0].extra2 = &init_net.ieee802154_lowpan.frags.high_thresh;
- table[1].data = &ieee802154_lowpan->frags.low_thresh;
- table[1].extra2 = &ieee802154_lowpan->frags.high_thresh;
- table[2].data = &ieee802154_lowpan->frags.timeout;
-
- /* Don't export sysctls to unprivileged users */
- if (net->user_ns != &init_user_ns)
- table[0].procname = NULL;
- }
-
- hdr = register_net_sysctl(net, "net/ieee802154/6lowpan", table);
- if (hdr == NULL)
- goto err_reg;
-
- ieee802154_lowpan->sysctl.frags_hdr = hdr;
- return 0;
-
-err_reg:
- if (!net_eq(net, &init_net))
- kfree(table);
-err_alloc:
- return -ENOMEM;
-}
-
-static void __net_exit lowpan_frags_ns_sysctl_unregister(struct net *net)
-{
- struct ctl_table *table;
- struct netns_ieee802154_lowpan *ieee802154_lowpan =
- net_ieee802154_lowpan(net);
-
- table = ieee802154_lowpan->sysctl.frags_hdr->ctl_table_arg;
- unregister_net_sysctl_table(ieee802154_lowpan->sysctl.frags_hdr);
- if (!net_eq(net, &init_net))
- kfree(table);
-}
-
-static struct ctl_table_header *lowpan_ctl_header;
-
-static int __init lowpan_frags_sysctl_register(void)
-{
- lowpan_ctl_header = register_net_sysctl(&init_net,
- "net/ieee802154/6lowpan",
- lowpan_frags_ctl_table);
- return lowpan_ctl_header == NULL ? -ENOMEM : 0;
-}
-
-static void lowpan_frags_sysctl_unregister(void)
-{
- unregister_net_sysctl_table(lowpan_ctl_header);
-}
-#else
-static inline int lowpan_frags_ns_sysctl_register(struct net *net)
-{
- return 0;
-}
-
-static inline void lowpan_frags_ns_sysctl_unregister(struct net *net)
-{
-}
-
-static inline int __init lowpan_frags_sysctl_register(void)
-{
- return 0;
-}
-
-static inline void lowpan_frags_sysctl_unregister(void)
-{
-}
-#endif
-
-static int __net_init lowpan_frags_init_net(struct net *net)
-{
- struct netns_ieee802154_lowpan *ieee802154_lowpan =
- net_ieee802154_lowpan(net);
-
- ieee802154_lowpan->frags.high_thresh = IPV6_FRAG_HIGH_THRESH;
- ieee802154_lowpan->frags.low_thresh = IPV6_FRAG_LOW_THRESH;
- ieee802154_lowpan->frags.timeout = IPV6_FRAG_TIMEOUT;
-
- inet_frags_init_net(&ieee802154_lowpan->frags);
-
- return lowpan_frags_ns_sysctl_register(net);
-}
-
-static void __net_exit lowpan_frags_exit_net(struct net *net)
-{
- struct netns_ieee802154_lowpan *ieee802154_lowpan =
- net_ieee802154_lowpan(net);
-
- lowpan_frags_ns_sysctl_unregister(net);
- inet_frags_exit_net(&ieee802154_lowpan->frags, &lowpan_frags);
-}
-
-static struct pernet_operations lowpan_frags_ops = {
- .init = lowpan_frags_init_net,
- .exit = lowpan_frags_exit_net,
-};
-
-int __init lowpan_net_frag_init(void)
-{
- int ret;
-
- ret = lowpan_frags_sysctl_register();
- if (ret)
- return ret;
-
- ret = register_pernet_subsys(&lowpan_frags_ops);
- if (ret)
- goto err_pernet;
-
- lowpan_frags.hashfn = lowpan_hashfn;
- lowpan_frags.constructor = lowpan_frag_init;
- lowpan_frags.destructor = NULL;
- lowpan_frags.skb_free = NULL;
- lowpan_frags.qsize = sizeof(struct frag_queue);
- lowpan_frags.match = lowpan_frag_match;
- lowpan_frags.frag_expire = lowpan_frag_expire;
- lowpan_frags.frags_cache_name = lowpan_frags_cache_name;
- ret = inet_frags_init(&lowpan_frags);
- if (ret)
- goto err_pernet;
-
- return ret;
-err_pernet:
- lowpan_frags_sysctl_unregister();
- return ret;
-}
-
-void lowpan_net_frag_exit(void)
-{
- inet_frags_fini(&lowpan_frags);
- lowpan_frags_sysctl_unregister();
- unregister_pernet_subsys(&lowpan_frags_ops);
-}
+++ /dev/null
-#ifndef __IEEE802154_6LOWPAN_REASSEMBLY_H__
-#define __IEEE802154_6LOWPAN_REASSEMBLY_H__
-
-#include <net/inet_frag.h>
-
-struct lowpan_create_arg {
- u16 tag;
- u16 d_size;
- const struct ieee802154_addr *src;
- const struct ieee802154_addr *dst;
-};
-
-/* Equivalent of ipv4 struct ip
- */
-struct lowpan_frag_queue {
- struct inet_frag_queue q;
-
- u16 tag;
- u16 d_size;
- struct ieee802154_addr saddr;
- struct ieee802154_addr daddr;
-};
-
-static inline u32 ieee802154_addr_hash(const struct ieee802154_addr *a)
-{
- switch (a->mode) {
- case IEEE802154_ADDR_LONG:
- return (((__force u64)a->extended_addr) >> 32) ^
- (((__force u64)a->extended_addr) & 0xffffffff);
- case IEEE802154_ADDR_SHORT:
- return (__force u32)(a->short_addr);
- default:
- return 0;
- }
-}
-
-int lowpan_frag_rcv(struct sk_buff *skb, const u8 frag_type);
-void lowpan_net_frag_exit(void);
-int lowpan_net_frag_init(void);
-
-#endif /* __IEEE802154_6LOWPAN_REASSEMBLY_H__ */
projects / mirror_ubuntu-bionic-kernel.git / commitdiff