![Alexander Aring](/assets/img/avatar_default.png)
Set the mac header length while creating the 802.15.4 mac header. Drop the function for recalculate mac header length in upper layers which was static and works for intra pan communication only. Signed-off-by: Alexander Aring <alex.aring@gmail.com> Reviewed-by: Werner Almesberger <werner@almesberger.net> Signed-off-by: David S. Miller <davem@davemloft.net>
561 lines
13 KiB
C
561 lines
13 KiB
C
/*
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* Copyright 2007-2012 Siemens AG
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Written by:
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* Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
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* Sergey Lapin <slapin@ossfans.org>
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* Maxim Gorbachyov <maxim.gorbachev@siemens.com>
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* Alexander Smirnov <alex.bluesman.smirnov@gmail.com>
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*/
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#include <linux/netdevice.h>
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#include <linux/module.h>
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#include <linux/if_arp.h>
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#include <net/rtnetlink.h>
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#include <linux/nl802154.h>
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#include <net/af_ieee802154.h>
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#include <net/mac802154.h>
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#include <net/ieee802154_netdev.h>
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#include <net/ieee802154.h>
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#include <net/wpan-phy.h>
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#include "mac802154.h"
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static inline int mac802154_fetch_skb_u8(struct sk_buff *skb, u8 *val)
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{
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if (unlikely(!pskb_may_pull(skb, 1)))
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return -EINVAL;
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*val = skb->data[0];
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skb_pull(skb, 1);
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return 0;
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}
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static inline int mac802154_fetch_skb_u16(struct sk_buff *skb, u16 *val)
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{
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if (unlikely(!pskb_may_pull(skb, 2)))
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return -EINVAL;
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*val = skb->data[0] | (skb->data[1] << 8);
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skb_pull(skb, 2);
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return 0;
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}
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static inline void mac802154_haddr_copy_swap(u8 *dest, const u8 *src)
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{
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int i;
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for (i = 0; i < IEEE802154_ADDR_LEN; i++)
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dest[IEEE802154_ADDR_LEN - i - 1] = src[i];
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}
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static int
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mac802154_wpan_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
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{
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struct mac802154_sub_if_data *priv = netdev_priv(dev);
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struct sockaddr_ieee802154 *sa =
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(struct sockaddr_ieee802154 *)&ifr->ifr_addr;
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int err = -ENOIOCTLCMD;
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spin_lock_bh(&priv->mib_lock);
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switch (cmd) {
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case SIOCGIFADDR:
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if (priv->pan_id == IEEE802154_PANID_BROADCAST ||
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priv->short_addr == IEEE802154_ADDR_BROADCAST) {
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err = -EADDRNOTAVAIL;
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break;
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}
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sa->family = AF_IEEE802154;
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sa->addr.addr_type = IEEE802154_ADDR_SHORT;
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sa->addr.pan_id = priv->pan_id;
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sa->addr.short_addr = priv->short_addr;
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err = 0;
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break;
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case SIOCSIFADDR:
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dev_warn(&dev->dev,
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"Using DEBUGing ioctl SIOCSIFADDR isn't recommened!\n");
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if (sa->family != AF_IEEE802154 ||
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sa->addr.addr_type != IEEE802154_ADDR_SHORT ||
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sa->addr.pan_id == IEEE802154_PANID_BROADCAST ||
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sa->addr.short_addr == IEEE802154_ADDR_BROADCAST ||
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sa->addr.short_addr == IEEE802154_ADDR_UNDEF) {
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err = -EINVAL;
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break;
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}
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priv->pan_id = sa->addr.pan_id;
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priv->short_addr = sa->addr.short_addr;
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err = 0;
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break;
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}
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spin_unlock_bh(&priv->mib_lock);
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return err;
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}
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static int mac802154_wpan_mac_addr(struct net_device *dev, void *p)
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{
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struct sockaddr *addr = p;
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if (netif_running(dev))
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return -EBUSY;
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/* FIXME: validate addr */
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memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
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mac802154_dev_set_ieee_addr(dev);
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return 0;
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}
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static int mac802154_header_create(struct sk_buff *skb,
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struct net_device *dev,
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unsigned short type,
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const void *_daddr,
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const void *_saddr,
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unsigned len)
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{
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const struct ieee802154_addr *saddr = _saddr;
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const struct ieee802154_addr *daddr = _daddr;
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struct ieee802154_addr dev_addr;
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struct mac802154_sub_if_data *priv = netdev_priv(dev);
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int pos = 2;
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u8 head[MAC802154_FRAME_HARD_HEADER_LEN];
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u16 fc;
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if (!daddr)
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return -EINVAL;
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head[pos++] = mac_cb(skb)->seq; /* DSN/BSN */
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fc = mac_cb_type(skb);
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if (mac_cb_is_ackreq(skb))
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fc |= IEEE802154_FC_ACK_REQ;
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if (!saddr) {
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spin_lock_bh(&priv->mib_lock);
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if (priv->short_addr == IEEE802154_ADDR_BROADCAST ||
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priv->short_addr == IEEE802154_ADDR_UNDEF ||
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priv->pan_id == IEEE802154_PANID_BROADCAST) {
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dev_addr.addr_type = IEEE802154_ADDR_LONG;
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memcpy(dev_addr.hwaddr, dev->dev_addr,
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IEEE802154_ADDR_LEN);
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} else {
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dev_addr.addr_type = IEEE802154_ADDR_SHORT;
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dev_addr.short_addr = priv->short_addr;
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}
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dev_addr.pan_id = priv->pan_id;
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saddr = &dev_addr;
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spin_unlock_bh(&priv->mib_lock);
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}
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if (daddr->addr_type != IEEE802154_ADDR_NONE) {
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fc |= (daddr->addr_type << IEEE802154_FC_DAMODE_SHIFT);
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head[pos++] = daddr->pan_id & 0xff;
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head[pos++] = daddr->pan_id >> 8;
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if (daddr->addr_type == IEEE802154_ADDR_SHORT) {
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head[pos++] = daddr->short_addr & 0xff;
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head[pos++] = daddr->short_addr >> 8;
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} else {
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mac802154_haddr_copy_swap(head + pos, daddr->hwaddr);
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pos += IEEE802154_ADDR_LEN;
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}
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}
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if (saddr->addr_type != IEEE802154_ADDR_NONE) {
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fc |= (saddr->addr_type << IEEE802154_FC_SAMODE_SHIFT);
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if ((saddr->pan_id == daddr->pan_id) &&
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(saddr->pan_id != IEEE802154_PANID_BROADCAST)) {
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/* PANID compression/intra PAN */
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fc |= IEEE802154_FC_INTRA_PAN;
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} else {
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head[pos++] = saddr->pan_id & 0xff;
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head[pos++] = saddr->pan_id >> 8;
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}
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if (saddr->addr_type == IEEE802154_ADDR_SHORT) {
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head[pos++] = saddr->short_addr & 0xff;
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head[pos++] = saddr->short_addr >> 8;
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} else {
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mac802154_haddr_copy_swap(head + pos, saddr->hwaddr);
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pos += IEEE802154_ADDR_LEN;
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}
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}
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head[0] = fc;
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head[1] = fc >> 8;
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memcpy(skb_push(skb, pos), head, pos);
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skb_reset_mac_header(skb);
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skb->mac_len = pos;
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return pos;
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}
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static int
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mac802154_header_parse(const struct sk_buff *skb, unsigned char *haddr)
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{
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const u8 *hdr = skb_mac_header(skb);
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const u8 *tail = skb_tail_pointer(skb);
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struct ieee802154_addr *addr = (struct ieee802154_addr *)haddr;
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u16 fc;
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int da_type;
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if (hdr + 3 > tail)
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goto malformed;
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fc = hdr[0] | (hdr[1] << 8);
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hdr += 3;
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da_type = IEEE802154_FC_DAMODE(fc);
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addr->addr_type = IEEE802154_FC_SAMODE(fc);
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switch (da_type) {
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case IEEE802154_ADDR_NONE:
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if (fc & IEEE802154_FC_INTRA_PAN)
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goto malformed;
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break;
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case IEEE802154_ADDR_LONG:
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if (fc & IEEE802154_FC_INTRA_PAN) {
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if (hdr + 2 > tail)
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goto malformed;
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addr->pan_id = hdr[0] | (hdr[1] << 8);
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hdr += 2;
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}
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if (hdr + IEEE802154_ADDR_LEN > tail)
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goto malformed;
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hdr += IEEE802154_ADDR_LEN;
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break;
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case IEEE802154_ADDR_SHORT:
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if (fc & IEEE802154_FC_INTRA_PAN) {
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if (hdr + 2 > tail)
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goto malformed;
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addr->pan_id = hdr[0] | (hdr[1] << 8);
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hdr += 2;
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}
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if (hdr + 2 > tail)
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goto malformed;
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hdr += 2;
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break;
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default:
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goto malformed;
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}
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switch (addr->addr_type) {
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case IEEE802154_ADDR_NONE:
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break;
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case IEEE802154_ADDR_LONG:
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if (!(fc & IEEE802154_FC_INTRA_PAN)) {
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if (hdr + 2 > tail)
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goto malformed;
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addr->pan_id = hdr[0] | (hdr[1] << 8);
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hdr += 2;
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}
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if (hdr + IEEE802154_ADDR_LEN > tail)
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goto malformed;
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mac802154_haddr_copy_swap(addr->hwaddr, hdr);
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hdr += IEEE802154_ADDR_LEN;
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break;
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case IEEE802154_ADDR_SHORT:
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if (!(fc & IEEE802154_FC_INTRA_PAN)) {
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if (hdr + 2 > tail)
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goto malformed;
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addr->pan_id = hdr[0] | (hdr[1] << 8);
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hdr += 2;
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}
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if (hdr + 2 > tail)
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goto malformed;
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addr->short_addr = hdr[0] | (hdr[1] << 8);
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hdr += 2;
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break;
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default:
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goto malformed;
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}
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return sizeof(struct ieee802154_addr);
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malformed:
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pr_debug("malformed packet\n");
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return 0;
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}
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static netdev_tx_t
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mac802154_wpan_xmit(struct sk_buff *skb, struct net_device *dev)
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{
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struct mac802154_sub_if_data *priv;
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u8 chan, page;
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priv = netdev_priv(dev);
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spin_lock_bh(&priv->mib_lock);
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chan = priv->chan;
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page = priv->page;
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spin_unlock_bh(&priv->mib_lock);
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if (chan == MAC802154_CHAN_NONE ||
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page >= WPAN_NUM_PAGES ||
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chan >= WPAN_NUM_CHANNELS) {
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kfree_skb(skb);
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return NETDEV_TX_OK;
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}
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skb->skb_iif = dev->ifindex;
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dev->stats.tx_packets++;
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dev->stats.tx_bytes += skb->len;
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return mac802154_tx(priv->hw, skb, page, chan);
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}
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static struct header_ops mac802154_header_ops = {
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.create = mac802154_header_create,
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.parse = mac802154_header_parse,
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};
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static const struct net_device_ops mac802154_wpan_ops = {
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.ndo_open = mac802154_slave_open,
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.ndo_stop = mac802154_slave_close,
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.ndo_start_xmit = mac802154_wpan_xmit,
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.ndo_do_ioctl = mac802154_wpan_ioctl,
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.ndo_set_mac_address = mac802154_wpan_mac_addr,
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};
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void mac802154_wpan_setup(struct net_device *dev)
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{
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struct mac802154_sub_if_data *priv;
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dev->addr_len = IEEE802154_ADDR_LEN;
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memset(dev->broadcast, 0xff, IEEE802154_ADDR_LEN);
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dev->hard_header_len = MAC802154_FRAME_HARD_HEADER_LEN;
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dev->header_ops = &mac802154_header_ops;
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dev->needed_tailroom = 2; /* FCS */
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dev->mtu = IEEE802154_MTU;
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dev->tx_queue_len = 300;
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dev->type = ARPHRD_IEEE802154;
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dev->flags = IFF_NOARP | IFF_BROADCAST;
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dev->watchdog_timeo = 0;
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dev->destructor = free_netdev;
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dev->netdev_ops = &mac802154_wpan_ops;
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dev->ml_priv = &mac802154_mlme_wpan;
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priv = netdev_priv(dev);
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priv->type = IEEE802154_DEV_WPAN;
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priv->chan = MAC802154_CHAN_NONE;
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priv->page = 0;
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spin_lock_init(&priv->mib_lock);
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get_random_bytes(&priv->bsn, 1);
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get_random_bytes(&priv->dsn, 1);
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priv->pan_id = IEEE802154_PANID_BROADCAST;
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priv->short_addr = IEEE802154_ADDR_BROADCAST;
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}
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static int mac802154_process_data(struct net_device *dev, struct sk_buff *skb)
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{
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return netif_rx_ni(skb);
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}
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static int
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mac802154_subif_frame(struct mac802154_sub_if_data *sdata, struct sk_buff *skb)
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{
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pr_debug("getting packet via slave interface %s\n", sdata->dev->name);
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spin_lock_bh(&sdata->mib_lock);
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switch (mac_cb(skb)->da.addr_type) {
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case IEEE802154_ADDR_NONE:
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if (mac_cb(skb)->sa.addr_type != IEEE802154_ADDR_NONE)
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/* FIXME: check if we are PAN coordinator */
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skb->pkt_type = PACKET_OTHERHOST;
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else
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/* ACK comes with both addresses empty */
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skb->pkt_type = PACKET_HOST;
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break;
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case IEEE802154_ADDR_LONG:
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if (mac_cb(skb)->da.pan_id != sdata->pan_id &&
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mac_cb(skb)->da.pan_id != IEEE802154_PANID_BROADCAST)
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skb->pkt_type = PACKET_OTHERHOST;
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else if (!memcmp(mac_cb(skb)->da.hwaddr, sdata->dev->dev_addr,
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IEEE802154_ADDR_LEN))
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skb->pkt_type = PACKET_HOST;
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else
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skb->pkt_type = PACKET_OTHERHOST;
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break;
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case IEEE802154_ADDR_SHORT:
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if (mac_cb(skb)->da.pan_id != sdata->pan_id &&
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mac_cb(skb)->da.pan_id != IEEE802154_PANID_BROADCAST)
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skb->pkt_type = PACKET_OTHERHOST;
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else if (mac_cb(skb)->da.short_addr == sdata->short_addr)
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skb->pkt_type = PACKET_HOST;
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else if (mac_cb(skb)->da.short_addr ==
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IEEE802154_ADDR_BROADCAST)
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skb->pkt_type = PACKET_BROADCAST;
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else
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skb->pkt_type = PACKET_OTHERHOST;
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break;
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default:
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break;
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}
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spin_unlock_bh(&sdata->mib_lock);
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skb->dev = sdata->dev;
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sdata->dev->stats.rx_packets++;
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sdata->dev->stats.rx_bytes += skb->len;
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switch (mac_cb_type(skb)) {
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case IEEE802154_FC_TYPE_DATA:
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return mac802154_process_data(sdata->dev, skb);
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default:
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pr_warning("ieee802154: bad frame received (type = %d)\n",
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mac_cb_type(skb));
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kfree_skb(skb);
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return NET_RX_DROP;
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}
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}
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static int mac802154_parse_frame_start(struct sk_buff *skb)
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{
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u8 *head = skb->data;
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u16 fc;
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if (mac802154_fetch_skb_u16(skb, &fc) ||
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mac802154_fetch_skb_u8(skb, &(mac_cb(skb)->seq)))
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goto err;
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pr_debug("fc: %04x dsn: %02x\n", fc, head[2]);
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mac_cb(skb)->flags = IEEE802154_FC_TYPE(fc);
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mac_cb(skb)->sa.addr_type = IEEE802154_FC_SAMODE(fc);
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mac_cb(skb)->da.addr_type = IEEE802154_FC_DAMODE(fc);
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if (fc & IEEE802154_FC_INTRA_PAN)
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mac_cb(skb)->flags |= MAC_CB_FLAG_INTRAPAN;
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if (mac_cb(skb)->da.addr_type != IEEE802154_ADDR_NONE) {
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if (mac802154_fetch_skb_u16(skb, &(mac_cb(skb)->da.pan_id)))
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goto err;
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/* source PAN id compression */
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if (mac_cb_is_intrapan(skb))
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mac_cb(skb)->sa.pan_id = mac_cb(skb)->da.pan_id;
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pr_debug("dest PAN addr: %04x\n", mac_cb(skb)->da.pan_id);
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if (mac_cb(skb)->da.addr_type == IEEE802154_ADDR_SHORT) {
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u16 *da = &(mac_cb(skb)->da.short_addr);
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if (mac802154_fetch_skb_u16(skb, da))
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goto err;
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pr_debug("destination address is short: %04x\n",
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mac_cb(skb)->da.short_addr);
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} else {
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if (!pskb_may_pull(skb, IEEE802154_ADDR_LEN))
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goto err;
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|
|
mac802154_haddr_copy_swap(mac_cb(skb)->da.hwaddr,
|
|
skb->data);
|
|
skb_pull(skb, IEEE802154_ADDR_LEN);
|
|
|
|
pr_debug("destination address is hardware\n");
|
|
}
|
|
}
|
|
|
|
if (mac_cb(skb)->sa.addr_type != IEEE802154_ADDR_NONE) {
|
|
/* non PAN-compression, fetch source address id */
|
|
if (!(mac_cb_is_intrapan(skb))) {
|
|
u16 *sa_pan = &(mac_cb(skb)->sa.pan_id);
|
|
|
|
if (mac802154_fetch_skb_u16(skb, sa_pan))
|
|
goto err;
|
|
}
|
|
|
|
pr_debug("source PAN addr: %04x\n", mac_cb(skb)->da.pan_id);
|
|
|
|
if (mac_cb(skb)->sa.addr_type == IEEE802154_ADDR_SHORT) {
|
|
u16 *sa = &(mac_cb(skb)->sa.short_addr);
|
|
|
|
if (mac802154_fetch_skb_u16(skb, sa))
|
|
goto err;
|
|
|
|
pr_debug("source address is short: %04x\n",
|
|
mac_cb(skb)->sa.short_addr);
|
|
} else {
|
|
if (!pskb_may_pull(skb, IEEE802154_ADDR_LEN))
|
|
goto err;
|
|
|
|
mac802154_haddr_copy_swap(mac_cb(skb)->sa.hwaddr,
|
|
skb->data);
|
|
skb_pull(skb, IEEE802154_ADDR_LEN);
|
|
|
|
pr_debug("source address is hardware\n");
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
err:
|
|
return -EINVAL;
|
|
}
|
|
|
|
void mac802154_wpans_rx(struct mac802154_priv *priv, struct sk_buff *skb)
|
|
{
|
|
int ret;
|
|
struct sk_buff *sskb;
|
|
struct mac802154_sub_if_data *sdata;
|
|
|
|
ret = mac802154_parse_frame_start(skb);
|
|
if (ret) {
|
|
pr_debug("got invalid frame\n");
|
|
return;
|
|
}
|
|
|
|
rcu_read_lock();
|
|
list_for_each_entry_rcu(sdata, &priv->slaves, list) {
|
|
if (sdata->type != IEEE802154_DEV_WPAN)
|
|
continue;
|
|
|
|
sskb = skb_clone(skb, GFP_ATOMIC);
|
|
if (sskb)
|
|
mac802154_subif_frame(sdata, sskb);
|
|
}
|
|
rcu_read_unlock();
|
|
}
|