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Message-ID: <20090810172843.GD6791@linux.vnet.ibm.com>
Date: Mon, 10 Aug 2009 10:28:43 -0700
From: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To: Dmitry Eremin-Solenikov <dbaryshkov@...il.com>
Cc: netdev@...r.kernel.org, linux-zigbee-devel@...ts.sourceforge.net,
linux-wireless@...r.kernel.org, Sergey Lapin <slapin@...fans.org>
Subject: Re: [PATCH 1/2] mac802154: add a software MAC 802.15.4
implementation
On Mon, Aug 10, 2009 at 06:16:39PM +0400, Dmitry Eremin-Solenikov wrote:
> Some of available devices are just dump radios implementing IEEE 802.15.4
> PHY layer. This commit adds a common library that acts like an intermediate
> layer between our socket family and drivers for those dumb devices.
>
> Currently this is data-only part (no commands, no beacons). Control
> interfaces will follow up shortly.
>
> Note this implementaion is neither certified, nor feature complete!
One question below, otherwise looks plausible. (I am not entirely sure
which lists are which...)
Thanx, Paul
> Signed-off-by: Dmitry Eremin-Solenikov <dbaryshkov@...il.com>
> Signed-off-by: Sergey Lapin <slapin@...fans.org>
> ---
> MAINTAINERS | 1 +
> include/linux/mac802154.h | 35 ++
> include/net/mac802154.h | 106 ++++++
> net/Kconfig | 1 +
> net/Makefile | 1 +
> net/mac802154/Kconfig | 17 +
> net/mac802154/Makefile | 4 +
> net/mac802154/dev.c | 924 +++++++++++++++++++++++++++++++++++++++++++++
> net/mac802154/mac802154.h | 85 +++++
> net/mac802154/mac_cmd.c | 99 +++++
> net/mac802154/mdev.c | 295 +++++++++++++++
> net/mac802154/mib.h | 32 ++
> net/mac802154/rx.c | 98 +++++
> 13 files changed, 1698 insertions(+), 0 deletions(-)
> create mode 100644 include/linux/mac802154.h
> create mode 100644 include/net/mac802154.h
> create mode 100644 net/mac802154/Kconfig
> create mode 100644 net/mac802154/Makefile
> create mode 100644 net/mac802154/dev.c
> create mode 100644 net/mac802154/mac802154.h
> create mode 100644 net/mac802154/mac_cmd.c
> create mode 100644 net/mac802154/mdev.c
> create mode 100644 net/mac802154/mib.h
> create mode 100644 net/mac802154/rx.c
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index d6befb2..5bdb64e 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -2529,6 +2529,7 @@ W: http://apps.sourceforge.net/trac/linux-zigbee
> T: git git://git.kernel.org/pub/scm/linux/kernel/git/lowpan/lowpan.git
> S: Maintained
> F: net/ieee802154/
> +F: net/mac802154/
> F: drivers/ieee802154/
>
> INTEGRITY MEASUREMENT ARCHITECTURE (IMA)
> diff --git a/include/linux/mac802154.h b/include/linux/mac802154.h
> new file mode 100644
> index 0000000..e95e38d
> --- /dev/null
> +++ b/include/linux/mac802154.h
> @@ -0,0 +1,35 @@
> +/*
> + * Copyright (C) 2007, 2008, 2009 Siemens AG
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2
> + * as published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License along
> + * with this program; if not, write to the Free Software Foundation, Inc.,
> + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
> + *
> + */
> +
> +#ifndef LINUX_MAC802154_H
> +#define LINUX_MAC802154_H
> +
> +enum {
> + IFLA_WPAN_UNSPEC,
> + IFLA_WPAN_CHANNEL,
> + IFLA_WPAN_PAN_ID,
> + IFLA_WPAN_SHORT_ADDR,
> + IFLA_WPAN_COORD_SHORT_ADDR,
> + IFLA_WPAN_COORD_EXT_ADDR,
> + __IFLA_WPAN_MAX,
> +};
> +
> +#define IFLA_WPAN_MAX (__IFLA_WPAN_MAX - 1)
> +
> +#endif
> +
> diff --git a/include/net/mac802154.h b/include/net/mac802154.h
> new file mode 100644
> index 0000000..db76799
> --- /dev/null
> +++ b/include/net/mac802154.h
> @@ -0,0 +1,106 @@
> +/*
> + * IEEE802.15.4-2003 specification
> + *
> + * Copyright (C) 2007, 2008 Siemens AG
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2
> + * as published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License along
> + * with this program; if not, write to the Free Software Foundation, Inc.,
> + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
> + *
> + * Written by:
> + */
> +#ifndef NET_MAC802154_H
> +#define NET_MAC802154_H
> +
> +struct ieee802154_dev {
> + int extra_tx_headroom; /* headroom to reserve for tx skb */
> + void *priv; /* driver-specific data */
> + u32 channel_mask;
> + u8 current_channel;
> + u32 flags; /* Flags for device to set */
> + struct device *parent;
> +};
> +
> +/* Checksum is in hardware and is omitted from packet */
> +/**
> + * enum ieee802154_hw_flags - hardware flags
> + *
> + * These flags are used to indicate hardware capabilities to
> + * the stack. Generally, flags here should have their meaning
> + * done in a way that the simplest hardware doesn't need setting
> + * any particular flags. There are some exceptions to this rule,
> + * however, so you are advised to review these flags carefully.
> + *
> + * @IEEE802154_HW_OMIT_CKSUM:
> + * Indicates that receiver omits FCS and transmitter will add
> + * FCS on it's own.
> + *
> + * @IEEE802154_HW_AACK:
> + * Indicates that receiver will autorespond with ACK frames.
> + */
> +enum ieee802154_hw_flags {
> + IEEE802154_HW_OMIT_CKSUM = 1 << 0,
> + IEEE802154_HW_AACK = 1 << 1,
> +};
> +
> +struct sk_buff;
> +
> +/**
> + * struct ieee802154_ops - callbacks from mac802154 to the driver
> + *
> + * This structure contains various callbacks that the driver may
> + * handle or, in some cases, must handle, for example to transmit
> + * a frame.
> + *
> + * @start: Handler that 802.15.4 module calls for device initialisation.
> + * This function is called before the first interface is attached.
> + *
> + * @stop: Handler that 802.15.4 module calls for device cleanup
> + * This function is called after the last interface is removed.
> + *
> + * @tx: Handler that 802.15.4 module calls for each transmitted frame.
> + * skb cntains the buffer starting from the IEEE 802.15.4 header.
> + * The low-level driver should send the frame based on available
> + * configuration.
> + * This function should return zero or negative errno.
> + *
> + * @ed: Handler that 802.15.4 module calls for Energy Detection.
> + * This function should place the value for detected energy
> + * (usually device-dependant) in the level pointer and return
> + * either zero or negative errno.
> + *
> + * @set_channel: Set radio for listening on specific channel.
> + * Set the device for listening on specified channel.
> + * Returns either zero, or negative errno.
> + */
> +struct ieee802154_ops {
> + struct module *owner;
> + int (*start)(struct ieee802154_dev *dev);
> + void (*stop)(struct ieee802154_dev *dev);
> + int (*xmit)(struct ieee802154_dev *dev,
> + struct sk_buff *skb);
> + int (*ed)(struct ieee802154_dev *dev, u8 *level);
> + int (*set_channel)(struct ieee802154_dev *dev,
> + int channel);
> +};
> +
> +struct ieee802154_dev *ieee802154_alloc_device(size_t priv_size,
> + struct ieee802154_ops *ops);
> +int ieee802154_register_device(struct ieee802154_dev *dev);
> +void ieee802154_unregister_device(struct ieee802154_dev *dev);
> +void ieee802154_free_device(struct ieee802154_dev *dev);
> +
> +void ieee802154_rx(struct ieee802154_dev *dev, struct sk_buff *skb, u8 lqi);
> +void ieee802154_rx_irqsafe(struct ieee802154_dev *dev, struct sk_buff *skb,
> + u8 lqi);
> +#endif
> +
> diff --git a/net/Kconfig b/net/Kconfig
> index 7051b97..b42d325 100644
> --- a/net/Kconfig
> +++ b/net/Kconfig
> @@ -180,6 +180,7 @@ source "net/econet/Kconfig"
> source "net/wanrouter/Kconfig"
> source "net/phonet/Kconfig"
> source "net/ieee802154/Kconfig"
> +source "net/mac802154/Kconfig"
> source "net/sched/Kconfig"
> source "net/dcb/Kconfig"
>
> diff --git a/net/Makefile b/net/Makefile
> index ba324ae..81115f6 100644
> --- a/net/Makefile
> +++ b/net/Makefile
> @@ -61,6 +61,7 @@ ifneq ($(CONFIG_DCB),)
> obj-y += dcb/
> endif
> obj-y += ieee802154/
> +obj-y += mac802154/
>
> ifeq ($(CONFIG_NET),y)
> obj-$(CONFIG_SYSCTL) += sysctl_net.o
> diff --git a/net/mac802154/Kconfig b/net/mac802154/Kconfig
> new file mode 100644
> index 0000000..2dd7f99
> --- /dev/null
> +++ b/net/mac802154/Kconfig
> @@ -0,0 +1,17 @@
> +config MAC802154
> + tristate "Generic IEEE 802.15.4 Soft Networking Stack (mac802154)"
> + depends on IEEE802154 && EXPERIMENTAL
> + select CRC_CCITT
> + ---help---
> + This option enables the hardware independent IEEE 802.15.4
> + networking stack for SoftMAC devices (the ones implementing
> + only PHY level of IEEE 802.15.4 standard).
> +
> + Note: this implementation is neither certified, nor feature
> + complete! We do not garantee that it is compatible w/ other
> + implementations, etc.
> +
> + If you plan to use HardMAC IEEE 802.15.4 devices, you can
> + say N here. Alternatievly you can say M to compile it as
> + module.
> +
> diff --git a/net/mac802154/Makefile b/net/mac802154/Makefile
> new file mode 100644
> index 0000000..07b7821
> --- /dev/null
> +++ b/net/mac802154/Makefile
> @@ -0,0 +1,4 @@
> +obj-$(CONFIG_MAC802154) += mac802154.o
> +mac802154-objs := rx.o mdev.o dev.o mac_cmd.o
> +
> +EXTRA_CFLAGS += -Wall -DDEBUG
> diff --git a/net/mac802154/dev.c b/net/mac802154/dev.c
> new file mode 100644
> index 0000000..b40f6fd
> --- /dev/null
> +++ b/net/mac802154/dev.c
> @@ -0,0 +1,924 @@
> +/*
> + * Copyright 2007, 2008, 2009 Siemens AG
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2
> + * as published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License along
> + * with this program; if not, write to the Free Software Foundation, Inc.,
> + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
> + *
> + * Written by:
> + * Sergey Lapin <slapin@...fans.org>
> + * Maxim Gorbachyov <maxim.gorbachev@...mens.com>
> + */
> +
> +#include <linux/net.h>
> +#include <linux/capability.h>
> +#include <linux/module.h>
> +#include <linux/if_arp.h>
> +#include <linux/rculist.h>
> +#include <linux/random.h>
> +#include <linux/crc-ccitt.h>
> +#include <linux/mac802154.h>
> +#include <net/rtnetlink.h>
> +
> +#include <net/af_ieee802154.h>
> +#include <net/mac802154.h>
> +#include <net/ieee802154_netdev.h>
> +#include <net/ieee802154.h>
> +
> +#include "mac802154.h"
> +#include "mib.h"
> +
> +static int ieee802154_net_xmit(struct sk_buff *skb, struct net_device *dev)
> +{
> + struct ieee802154_sub_if_data *priv;
> + priv = netdev_priv(dev);
> +
> + if (!(priv->hw->hw.flags & IEEE802154_HW_OMIT_CKSUM)) {
> + u16 crc = crc_ccitt(0, skb->data, skb->len);
> + u8 *data = skb_put(skb, 2);
> + data[0] = crc & 0xff;
> + data[1] = crc >> 8;
> + }
> +
> + read_lock(&priv->mib_lock);
> + phy_cb(skb)->chan = priv->chan;
> + read_unlock(&priv->mib_lock);
> +
> + skb->iif = dev->ifindex;
> + skb->dev = priv->hw->netdev;
> + dev->stats.tx_packets++;
> + dev->stats.tx_bytes += skb->len;
> +
> + dev->trans_start = jiffies;
> + dev_queue_xmit(skb);
> +
> + return 0;
> +}
> +
> +static int ieee802154_slave_open(struct net_device *dev)
> +{
> + struct ieee802154_sub_if_data *priv = netdev_priv(dev);
> + int res = 0;
> +
> + if (priv->hw->open_count++ == 0) {
> + res = dev_open(priv->hw->netdev);
> + WARN_ON(res);
> + if (res)
> + goto err;
> + }
> +
> + netif_start_queue(dev);
> + return 0;
> +err:
> + priv->hw->open_count--;
> +
> + return res;
> +}
> +
> +static int ieee802154_slave_close(struct net_device *dev)
> +{
> + struct ieee802154_sub_if_data *priv = netdev_priv(dev);
> +
> + netif_stop_queue(dev);
> +
> + if ((--priv->hw->open_count) == 0) {
> + if (netif_running(priv->hw->netdev))
> + dev_close(priv->hw->netdev);
> + }
> +
> + return 0;
> +}
> +
> +
> +static int ieee802154_slave_ioctl(struct net_device *dev, struct ifreq *ifr,
> + int cmd)
> +{
> + struct ieee802154_sub_if_data *priv = netdev_priv(dev);
> + struct sockaddr_ieee802154 *sa =
> + (struct sockaddr_ieee802154 *)&ifr->ifr_addr;
> + int err = -ENOIOCTLCMD;
> +
> + read_lock(&priv->mib_lock);
> +
> + switch (cmd) {
> + case SIOCGIFADDR:
> + if (priv->pan_id == IEEE802154_PANID_BROADCAST ||
> + priv->short_addr == IEEE802154_ADDR_BROADCAST) {
> + err = -EADDRNOTAVAIL;
> + break;
> + }
> +
> + sa->family = AF_IEEE802154;
> + sa->addr.addr_type = IEEE802154_ADDR_SHORT;
> + sa->addr.pan_id = priv->pan_id;
> + sa->addr.short_addr = priv->short_addr;
> +
> + err = 0;
> + break;
> + case SIOCSIFADDR:
> + dev_warn(&dev->dev,
> + "Using DEBUGing ioctl SIOCSIFADDR isn't recommened!\n");
> + if (sa->family != AF_IEEE802154 ||
> + sa->addr.addr_type != IEEE802154_ADDR_SHORT ||
> + sa->addr.pan_id == IEEE802154_PANID_BROADCAST ||
> + sa->addr.short_addr == IEEE802154_ADDR_BROADCAST ||
> + sa->addr.short_addr == IEEE802154_ADDR_UNDEF) {
> + err = -EINVAL;
> + break;
> + }
> +
> + priv->pan_id = sa->addr.pan_id;
> + priv->short_addr = sa->addr.short_addr;
> + err = 0;
> + break;
> + }
> + read_unlock(&priv->mib_lock);
> + return err;
> +}
> +
> +static int ieee802154_slave_mac_addr(struct net_device *dev, void *p)
> +{
> + struct sockaddr *addr = p;
> +
> + if (netif_running(dev))
> + return -EBUSY;
> + /* FIXME: validate addr */
> + memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
> + return 0;
> +}
> +
> +static void ieee802154_haddr_copy_swap(u8 *dest, const u8 *src)
> +{
> + int i;
> + for (i = 0; i < IEEE802154_ADDR_LEN; i++)
> + dest[IEEE802154_ADDR_LEN - i - 1] = src[i];
> +}
> +
> +static int ieee802154_header_create(struct sk_buff *skb,
> + struct net_device *dev,
> + unsigned short type, const void *_daddr,
> + const void *_saddr, unsigned len)
> +{
> + u8 head[24] = {};
> + int pos = 0;
> +
> + u16 fc;
> + const struct ieee802154_addr *saddr = _saddr;
> + const struct ieee802154_addr *daddr = _daddr;
> + struct ieee802154_addr dev_addr;
> + struct ieee802154_sub_if_data *priv = netdev_priv(dev);
> +
> + fc = mac_cb_type(skb);
> + if (mac_cb_is_ackreq(skb))
> + fc |= IEEE802154_FC_ACK_REQ;
> +
> + pos = 2;
> +
> + head[pos++] = mac_cb(skb)->seq; /* DSN/BSN */
> +
> + if (!daddr)
> + return -EINVAL;
> +
> + if (!saddr) {
> + read_lock(&priv->mib_lock);
> + if (priv->short_addr == IEEE802154_ADDR_BROADCAST ||
> + priv->short_addr == IEEE802154_ADDR_UNDEF ||
> + priv->pan_id == IEEE802154_PANID_BROADCAST) {
> + dev_addr.addr_type = IEEE802154_ADDR_LONG;
> + memcpy(dev_addr.hwaddr, dev->dev_addr,
> + IEEE802154_ADDR_LEN);
> + } else {
> + dev_addr.addr_type = IEEE802154_ADDR_SHORT;
> + dev_addr.short_addr = priv->short_addr;
> + }
> +
> + dev_addr.pan_id = priv->pan_id;
> + saddr = &dev_addr;
> +
> + read_unlock(&priv->mib_lock);
> + }
> +
> + if (daddr->addr_type != IEEE802154_ADDR_NONE) {
> + fc |= (daddr->addr_type << IEEE802154_FC_DAMODE_SHIFT);
> +
> + head[pos++] = daddr->pan_id & 0xff;
> + head[pos++] = daddr->pan_id >> 8;
> +
> + if (daddr->addr_type == IEEE802154_ADDR_SHORT) {
> + head[pos++] = daddr->short_addr & 0xff;
> + head[pos++] = daddr->short_addr >> 8;
> + } else {
> + ieee802154_haddr_copy_swap(head + pos, daddr->hwaddr);
> + pos += IEEE802154_ADDR_LEN;
> + }
> + }
> +
> + if (saddr->addr_type != IEEE802154_ADDR_NONE) {
> + fc |= (saddr->addr_type << IEEE802154_FC_SAMODE_SHIFT);
> +
> + if ((saddr->pan_id == daddr->pan_id) &&
> + (saddr->pan_id != IEEE802154_PANID_BROADCAST))
> + /* PANID compression/ intra PAN */
> + fc |= IEEE802154_FC_INTRA_PAN;
> + else {
> + head[pos++] = saddr->pan_id & 0xff;
> + head[pos++] = saddr->pan_id >> 8;
> + }
> +
> + if (saddr->addr_type == IEEE802154_ADDR_SHORT) {
> + head[pos++] = saddr->short_addr & 0xff;
> + head[pos++] = saddr->short_addr >> 8;
> + } else {
> + ieee802154_haddr_copy_swap(head + pos, saddr->hwaddr);
> + pos += IEEE802154_ADDR_LEN;
> + }
> + }
> +
> + head[0] = fc;
> + head[1] = fc >> 8;
> +
> + memcpy(skb_push(skb, pos), head, pos);
> +
> + return pos;
> +}
> +
> +static int ieee802154_header_parse(const struct sk_buff *skb,
> + unsigned char *haddr)
> +{
> + const u8 *hdr = skb_mac_header(skb), *tail = skb_tail_pointer(skb);
> + struct ieee802154_addr *addr = (struct ieee802154_addr *)haddr;
> + u16 fc;
> + int da_type;
> +
> + if (hdr + 3 > tail)
> + goto malformed;
> +
> + fc = hdr[0] | (hdr[1] << 8);
> +
> + hdr += 3;
> +
> + da_type = IEEE802154_FC_DAMODE(fc);
> + addr->addr_type = IEEE802154_FC_SAMODE(fc);
> +
> + switch (da_type) {
> + case IEEE802154_ADDR_NONE:
> + if (fc & IEEE802154_FC_INTRA_PAN)
> + goto malformed;
> + break;
> +
> + case IEEE802154_ADDR_LONG:
> + if (hdr + 2 > tail)
> + goto malformed;
> + if (fc & IEEE802154_FC_INTRA_PAN) {
> + addr->pan_id = hdr[0] | (hdr[1] << 8);
> + hdr += 2;
> + }
> +
> + if (hdr + IEEE802154_ADDR_LEN > tail)
> + goto malformed;
> + hdr += IEEE802154_ADDR_LEN;
> + break;
> +
> + case IEEE802154_ADDR_SHORT:
> + if (hdr + 2 > tail)
> + goto malformed;
> + if (fc & IEEE802154_FC_INTRA_PAN) {
> + addr->pan_id = hdr[0] | (hdr[1] << 8);
> + hdr += 2;
> + }
> +
> + if (hdr + 2 > tail)
> + goto malformed;
> + hdr += 2;
> + break;
> +
> + default:
> + goto malformed;
> +
> + }
> +
> + switch (addr->addr_type) {
> + case IEEE802154_ADDR_NONE:
> + break;
> +
> + case IEEE802154_ADDR_LONG:
> + if (hdr + 2 > tail)
> + goto malformed;
> + if (!(fc & IEEE802154_FC_INTRA_PAN)) {
> + addr->pan_id = hdr[0] | (hdr[1] << 8);
> + hdr += 2;
> + }
> +
> + if (hdr + IEEE802154_ADDR_LEN > tail)
> + goto malformed;
> + memcpy(addr->hwaddr, hdr, IEEE802154_ADDR_LEN);
> + hdr += IEEE802154_ADDR_LEN;
> + break;
> +
> + case IEEE802154_ADDR_SHORT:
> + if (hdr + 2 > tail)
> + goto malformed;
> + if (!(fc & IEEE802154_FC_INTRA_PAN)) {
> + addr->pan_id = hdr[0] | (hdr[1] << 8);
> + hdr += 2;
> + }
> +
> + if (hdr + 2 > tail)
> + goto malformed;
> + addr->short_addr = hdr[0] | (hdr[1] << 8);
> + hdr += 2;
> + break;
> +
> + default:
> + goto malformed;
> +
> + }
> +
> + return sizeof(struct ieee802154_addr);
> +
> +malformed:
> + pr_debug("malformed packet\n");
> + return 0;
> +}
> +
> +static struct header_ops ieee802154_header_ops = {
> + .create = ieee802154_header_create,
> + .parse = ieee802154_header_parse,
> +};
> +
> +static const struct net_device_ops ieee802154_slave_ops = {
> + .ndo_open = ieee802154_slave_open,
> + .ndo_stop = ieee802154_slave_close,
> + .ndo_start_xmit = ieee802154_net_xmit,
> + .ndo_do_ioctl = ieee802154_slave_ioctl,
> + .ndo_set_mac_address = ieee802154_slave_mac_addr,
> +};
> +
> +static void ieee802154_netdev_setup(struct net_device *dev)
> +{
> + dev->addr_len = IEEE802154_ADDR_LEN;
> + memset(dev->broadcast, 0xff, IEEE802154_ADDR_LEN);
> + dev->features = NETIF_F_NO_CSUM;
> + dev->hard_header_len = 2 + 1 + 20 + 14;
> + dev->header_ops = &ieee802154_header_ops;
> + dev->needed_tailroom = 2; /* FCS */
> + dev->mtu = 127;
> + dev->tx_queue_len = 10;
> + dev->type = ARPHRD_IEEE802154;
> + dev->flags = IFF_NOARP | IFF_BROADCAST;
> + dev->watchdog_timeo = 0;
> +
> + dev->destructor = free_netdev;
> + dev->netdev_ops = &ieee802154_slave_ops;
> + dev->ml_priv = &mac802154_mlme;
> +}
> +
> +/*
> + * This is for hw unregistration only, as it doesn't do RCU locking
So this list is different than the RCU-protected one, and readers
always hold locks when traversing it?
I am not familiar with this code, so might be missing something, but
it looks to me like the same list that RCU readers traverse. If so,
need list_del_rcu() and synchronize_rcu().
> + */
> +void ieee802154_drop_slaves(struct ieee802154_dev *hw)
> +{
> + struct ieee802154_priv *priv = ieee802154_to_priv(hw);
> + struct ieee802154_sub_if_data *sdata, *next;
> +
> + ASSERT_RTNL();
> +
> + list_for_each_entry_safe(sdata, next, &priv->slaves, list) {
> + mutex_lock(&sdata->hw->slaves_mtx);
> + list_del(&sdata->list);
> + mutex_unlock(&sdata->hw->slaves_mtx);
> +
> + dev_put(sdata->hw->netdev);
> +
> + unregister_netdevice(sdata->dev);
> + }
> +}
> +
> +static int ieee802154_netdev_validate(struct nlattr *tb[],
> + struct nlattr *data[])
> +{
> + if (tb[IFLA_ADDRESS])
> + if (nla_len(tb[IFLA_ADDRESS]) != IEEE802154_ADDR_LEN)
> + return -EINVAL;
> +
> + if (tb[IFLA_BROADCAST])
> + return -EINVAL;
> +
> + return 0;
> +}
> +
> +static int ieee802154_netdev_newlink(struct net_device *dev,
> + struct nlattr *tb[],
> + struct nlattr *data[])
> +{
> + struct net_device *mdev;
> + struct ieee802154_sub_if_data *priv;
> + struct ieee802154_priv *ipriv;
> + int err;
> +
> + if (!tb[IFLA_LINK])
> + return -EOPNOTSUPP;
> +
> + mdev = __dev_get_by_index(dev_net(dev), nla_get_u32(tb[IFLA_LINK]));
> + if (!mdev)
> + return -ENODEV;
> +
> + if (mdev->type != ARPHRD_IEEE802154_PHY)
> + return -EINVAL;
> +
> + ipriv = netdev_priv(mdev);
> +
> + priv = netdev_priv(dev);
> + priv->dev = dev;
> + priv->hw = ipriv;
> +
> + rwlock_init(&priv->mib_lock);
> +
> + get_random_bytes(&priv->bsn, 1);
> + get_random_bytes(&priv->dsn, 1);
> +
> + priv->pan_id = IEEE802154_PANID_BROADCAST;
> + priv->short_addr = IEEE802154_ADDR_BROADCAST;
> +
> + dev_hold(ipriv->netdev);
> +
> + dev->needed_headroom = ipriv->hw.extra_tx_headroom;
> +
> + SET_NETDEV_DEV(dev, &ipriv->netdev->dev);
> +
> + err = register_netdevice(dev);
> + if (err < 0)
> + return err;
> +
> + mutex_lock(&ipriv->slaves_mtx);
> + list_add_tail_rcu(&priv->list, &ipriv->slaves);
> + mutex_unlock(&ipriv->slaves_mtx);
> +
> + return 0;
> +}
> +
> +static void ieee802154_netdev_dellink(struct net_device *dev)
> +{
> + struct ieee802154_sub_if_data *sdata;
> + ASSERT_RTNL();
> +
> + BUG_ON(dev->type != ARPHRD_IEEE802154);
> +
> + sdata = netdev_priv(dev);
> +
> + mutex_lock(&sdata->hw->slaves_mtx);
> + list_del_rcu(&sdata->list);
> + mutex_unlock(&sdata->hw->slaves_mtx);
> +
> + dev_put(sdata->hw->netdev);
> +
> + synchronize_rcu();
> + unregister_netdevice(sdata->dev);
> +}
> +
> +static size_t ieee802154_netdev_get_size(const struct net_device *dev)
> +{
> + return nla_total_size(2) + /* IFLA_WPAN_CHANNEL */
> + nla_total_size(2) + /* IFLA_WPAN_PAN_ID */
> + nla_total_size(2) + /* IFLA_WPAN_SHORT_ADDR */
> + nla_total_size(2) + /* IFLA_WPAN_COORD_SHORT_ADDR */
> + nla_total_size(8); /* IFLA_WPAN_COORD_EXT_ADDR */
> +}
> +
> +static int ieee802154_netdev_fill_info(struct sk_buff *skb,
> + const struct net_device *dev)
> +{
> + struct ieee802154_sub_if_data *priv = netdev_priv(dev);
> +
> + read_lock(&priv->mib_lock);
> +
> + NLA_PUT_U16(skb, IFLA_WPAN_CHANNEL, priv->chan);
> + NLA_PUT_U16(skb, IFLA_WPAN_PAN_ID, priv->pan_id);
> + NLA_PUT_U16(skb, IFLA_WPAN_SHORT_ADDR, priv->short_addr);
> + /* TODO: IFLA_WPAN_COORD_SHORT_ADDR */
> + /* TODO: IFLA_WPAN_COORD_EXT_ADDR */
> +
> + read_unlock(&priv->mib_lock);
> +
> + return 0;
> +
> +nla_put_failure:
> + read_unlock(&priv->mib_lock);
> + return -EMSGSIZE;
> +}
> +
> +static struct rtnl_link_ops wpan_link_ops __read_mostly = {
> + .kind = "wpan",
> + .priv_size = sizeof(struct ieee802154_sub_if_data),
> + .setup = ieee802154_netdev_setup,
> + .validate = ieee802154_netdev_validate,
> + .newlink = ieee802154_netdev_newlink,
> + .dellink = ieee802154_netdev_dellink,
> + .get_size = ieee802154_netdev_get_size,
> + .fill_info = ieee802154_netdev_fill_info,
> +};
> +
> +static int ieee802154_process_beacon(struct net_device *dev,
> + struct sk_buff *skb)
> +{
> + pr_warning("ieee802154: beacon frames are not yet supported\n");
> + kfree_skb(skb);
> + return NET_RX_DROP;
> +}
> +
> +static int ieee802154_process_ack(struct net_device *dev, struct sk_buff *skb)
> +{
> + pr_debug("got ACK for SEQ=%d\n", mac_cb(skb)->seq);
> +
> + kfree_skb(skb);
> + return NET_RX_SUCCESS;
> +}
> +
> +static int ieee802154_process_data(struct net_device *dev, struct sk_buff *skb)
> +{
> + return netif_rx(skb);
> +}
> +
> +static int ieee802154_subif_frame(struct ieee802154_sub_if_data *sdata,
> + struct sk_buff *skb)
> +{
> + pr_debug("%s Getting packet via slave interface %s\n",
> + __func__, sdata->dev->name);
> +
> + read_lock(&sdata->mib_lock);
> +
> + switch (mac_cb(skb)->da.addr_type) {
> + case IEEE802154_ADDR_NONE:
> + if (mac_cb(skb)->sa.addr_type != IEEE802154_ADDR_NONE)
> + /* FIXME: check if we are PAN coordinator :) */
> + skb->pkt_type = PACKET_OTHERHOST;
> + else
> + /* ACK comes with both addresses empty */
> + skb->pkt_type = PACKET_HOST;
> + break;
> + case IEEE802154_ADDR_LONG:
> + if (mac_cb(skb)->da.pan_id != sdata->pan_id &&
> + mac_cb(skb)->da.pan_id != IEEE802154_PANID_BROADCAST)
> + skb->pkt_type = PACKET_OTHERHOST;
> + else if (!memcmp(mac_cb(skb)->da.hwaddr, sdata->dev->dev_addr,
> + IEEE802154_ADDR_LEN))
> + skb->pkt_type = PACKET_HOST;
> + else
> + skb->pkt_type = PACKET_OTHERHOST;
> + break;
> + case IEEE802154_ADDR_SHORT:
> + if (mac_cb(skb)->da.pan_id != sdata->pan_id &&
> + mac_cb(skb)->da.pan_id != IEEE802154_PANID_BROADCAST)
> + skb->pkt_type = PACKET_OTHERHOST;
> + else if (mac_cb(skb)->da.short_addr == sdata->short_addr)
> + skb->pkt_type = PACKET_HOST;
> + else if (mac_cb(skb)->da.short_addr ==
> + IEEE802154_ADDR_BROADCAST)
> + skb->pkt_type = PACKET_BROADCAST;
> + else
> + skb->pkt_type = PACKET_OTHERHOST;
> + break;
> + }
> +
> + read_unlock(&sdata->mib_lock);
> +
> + skb->dev = sdata->dev;
> +
> + if (skb->pkt_type == PACKET_HOST && mac_cb_is_ackreq(skb) &&
> + !(sdata->hw->hw.flags & IEEE802154_HW_AACK))
> + dev_warn(&sdata->dev->dev,
> + "ACK requested, however AACK not supported.\n");
> +
> + switch (mac_cb_type(skb)) {
> + case IEEE802154_FC_TYPE_BEACON:
> + return ieee802154_process_beacon(sdata->dev, skb);
> + case IEEE802154_FC_TYPE_ACK:
> + return ieee802154_process_ack(sdata->dev, skb);
> + case IEEE802154_FC_TYPE_MAC_CMD:
> + return ieee802154_process_cmd(sdata->dev, skb);
> + case IEEE802154_FC_TYPE_DATA:
> + return ieee802154_process_data(sdata->dev, skb);
> + default:
> + pr_warning("ieee802154: Bad frame received (type = %d)\n",
> + mac_cb_type(skb));
> + kfree_skb(skb);
> + return NET_RX_DROP;
> + }
> +}
> +
> +static u8 fetch_skb_u8(struct sk_buff *skb)
> +{
> + u8 ret;
> +
> + BUG_ON(skb->len < 1);
> +
> + ret = skb->data[0];
> + skb_pull(skb, 1);
> +
> + return ret;
> +}
> +
> +static u16 fetch_skb_u16(struct sk_buff *skb)
> +{
> + u16 ret;
> +
> + BUG_ON(skb->len < 2);
> +
> + ret = skb->data[0] + (skb->data[1] * 256);
> + skb_pull(skb, 2);
> + return ret;
> +}
> +
> +static void fetch_skb_u64(struct sk_buff *skb, void *data)
> +{
> + BUG_ON(skb->len < IEEE802154_ADDR_LEN);
> +
> + memcpy(data, skb->data, IEEE802154_ADDR_LEN);
> + skb_pull(skb, IEEE802154_ADDR_LEN);
> +}
> +
> +#define IEEE802154_FETCH_U8(skb, var) \
> + do { \
> + if (skb->len < 1) \
> + goto exit_error; \
> + var = fetch_skb_u8(skb); \
> + } while (0)
> +
> +#define IEEE802154_FETCH_U16(skb, var) \
> + do { \
> + if (skb->len < 2) \
> + goto exit_error; \
> + var = fetch_skb_u16(skb); \
> + } while (0)
> +
> +#define IEEE802154_FETCH_U64(skb, var) \
> + do { \
> + if (skb->len < IEEE802154_ADDR_LEN) \
> + goto exit_error; \
> + fetch_skb_u64(skb, &var); \
> + } while (0)
> +
> +static int parse_frame_start(struct sk_buff *skb)
> +{
> + u8 *head = skb->data;
> + u16 fc;
> +
> + if (skb->len < 3) {
> + pr_debug("frame size %d bytes is too short\n", skb->len);
> + return -EINVAL;
> + }
> +
> + IEEE802154_FETCH_U16(skb, fc);
> + IEEE802154_FETCH_U8(skb, mac_cb(skb)->seq);
> +
> + pr_debug("%s: %04x dsn%02x\n", __func__, fc, head[2]);
> +
> + mac_cb(skb)->flags = IEEE802154_FC_TYPE(fc);
> +
> + if (fc & IEEE802154_FC_ACK_REQ) {
> + pr_debug("%s(): ACKNOWLEDGE required\n", __func__);
> + mac_cb(skb)->flags |= MAC_CB_FLAG_ACKREQ;
> + }
> +
> + if (fc & IEEE802154_FC_SECEN)
> + mac_cb(skb)->flags |= MAC_CB_FLAG_SECEN;
> +
> + if (fc & IEEE802154_FC_INTRA_PAN)
> + mac_cb(skb)->flags |= MAC_CB_FLAG_INTRAPAN;
> +
> + /* TODO */
> + if (mac_cb_is_secen(skb)) {
> + pr_info("security support is not implemented\n");
> + return -EINVAL;
> + }
> +
> + mac_cb(skb)->sa.addr_type = IEEE802154_FC_SAMODE(fc);
> + if (mac_cb(skb)->sa.addr_type == IEEE802154_ADDR_NONE)
> + pr_debug("%s(): src addr_type is NONE\n", __func__);
> +
> + mac_cb(skb)->da.addr_type = IEEE802154_FC_DAMODE(fc);
> + if (mac_cb(skb)->da.addr_type == IEEE802154_ADDR_NONE)
> + pr_debug("%s(): dst addr_type is NONE\n", __func__);
> +
> + if (IEEE802154_FC_TYPE(fc) == IEEE802154_FC_TYPE_ACK) {
> + /* ACK can only have NONE-type addresses */
> + if (mac_cb(skb)->sa.addr_type != IEEE802154_ADDR_NONE ||
> + mac_cb(skb)->da.addr_type != IEEE802154_ADDR_NONE)
> + return -EINVAL;
> + }
> +
> + if (mac_cb(skb)->da.addr_type != IEEE802154_ADDR_NONE) {
> + IEEE802154_FETCH_U16(skb, mac_cb(skb)->da.pan_id);
> +
> + if (mac_cb_is_intrapan(skb)) { /* ! panid compress */
> + pr_debug("%s(): src IEEE802154_FC_INTRA_PAN\n",
> + __func__);
> + mac_cb(skb)->sa.pan_id = mac_cb(skb)->da.pan_id;
> + pr_debug("%s(): src PAN address %04x\n",
> + __func__, mac_cb(skb)->sa.pan_id);
> + }
> +
> + pr_debug("%s(): dst PAN address %04x\n",
> + __func__, mac_cb(skb)->da.pan_id);
> +
> + if (mac_cb(skb)->da.addr_type == IEEE802154_ADDR_SHORT) {
> + IEEE802154_FETCH_U16(skb, mac_cb(skb)->da.short_addr);
> + pr_debug("%s(): dst SHORT address %04x\n",
> + __func__, mac_cb(skb)->da.short_addr);
> +
> + } else {
> + IEEE802154_FETCH_U64(skb, mac_cb(skb)->da.hwaddr);
> + pr_debug("%s(): dst hardware addr\n", __func__);
> + }
> + }
> +
> + if (mac_cb(skb)->sa.addr_type != IEEE802154_ADDR_NONE) {
> + pr_debug("%s(): got src non-NONE address\n", __func__);
> + if (!(mac_cb_is_intrapan(skb))) { /* ! panid compress */
> + IEEE802154_FETCH_U16(skb, mac_cb(skb)->sa.pan_id);
> + pr_debug("%s(): src IEEE802154_FC_INTRA_PAN\n",
> + __func__);
> + }
> +
> + if (mac_cb(skb)->sa.addr_type == IEEE802154_ADDR_SHORT) {
> + IEEE802154_FETCH_U16(skb, mac_cb(skb)->sa.short_addr);
> + pr_debug("%s(): src IEEE802154_ADDR_SHORT\n",
> + __func__);
> + } else {
> + IEEE802154_FETCH_U64(skb, mac_cb(skb)->sa.hwaddr);
> + pr_debug("%s(): src hardware addr\n", __func__);
> + }
> + }
> +
> + return 0;
> +
> +exit_error:
> + return -EINVAL;
> +}
> +
> +void ieee802154_subif_rx(struct ieee802154_dev *hw, struct sk_buff *skb)
> +{
> + struct ieee802154_priv *priv = ieee802154_to_priv(hw);
> + struct ieee802154_sub_if_data *sdata, *prev = NULL;
> + int ret;
> +
> + BUILD_BUG_ON(sizeof(struct ieee802154_mac_cb) > sizeof(skb->cb));
> + pr_debug("%s()\n", __func__);
> +
> + if (!(priv->hw.flags & IEEE802154_HW_OMIT_CKSUM)) {
> + u16 crc;
> +
> + if (skb->len < 2) {
> + pr_debug("%s(): Got invalid frame\n", __func__);
> + goto out;
> + }
> + crc = crc_ccitt(0, skb->data, skb->len);
> + if (crc) {
> + pr_debug("%s(): CRC mismatch\n", __func__);
> + goto out;
> + }
> + skb_trim(skb, skb->len - 2); /* CRC */
> + }
> +
> + ret = parse_frame_start(skb); /* 3 bytes pulled after this */
> + if (ret) {
> + pr_debug("%s(): Got invalid frame\n", __func__);
> + goto out;
> + }
> +
> + pr_debug("%s() frame %d\n", __func__, mac_cb_type(skb));
> +
> + rcu_read_lock();
> + list_for_each_entry_rcu(sdata, &priv->slaves, list)
> + {
> + if (prev) {
> + struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
> + if (skb2)
> + ieee802154_subif_frame(prev, skb2);
> + }
> +
> + prev = sdata;
> + }
> +
> + if (prev) {
> + ieee802154_subif_frame(prev, skb);
> + skb = NULL;
> + }
> +
> + rcu_read_unlock();
> +
> +out:
> + dev_kfree_skb(skb);
> + return;
> +}
> +
> +u16 ieee802154_dev_get_pan_id(struct net_device *dev)
> +{
> + struct ieee802154_sub_if_data *priv = netdev_priv(dev);
> + u16 ret;
> +
> + BUG_ON(dev->type != ARPHRD_IEEE802154);
> +
> + read_lock(&priv->mib_lock);
> + ret = priv->pan_id;
> + read_unlock(&priv->mib_lock);
> +
> + return ret;
> +}
> +
> +u16 ieee802154_dev_get_short_addr(struct net_device *dev)
> +{
> + struct ieee802154_sub_if_data *priv = netdev_priv(dev);
> + u16 ret;
> +
> + BUG_ON(dev->type != ARPHRD_IEEE802154);
> +
> + read_lock(&priv->mib_lock);
> + ret = priv->short_addr;
> + read_unlock(&priv->mib_lock);
> +
> + return ret;
> +}
> +
> +void ieee802154_dev_set_pan_id(struct net_device *dev, u16 val)
> +{
> + struct ieee802154_sub_if_data *priv = netdev_priv(dev);
> +
> + BUG_ON(dev->type != ARPHRD_IEEE802154);
> +
> + write_lock(&priv->mib_lock);
> + priv->pan_id = val;
> + write_unlock(&priv->mib_lock);
> +}
> +void ieee802154_dev_set_short_addr(struct net_device *dev, u16 val)
> +{
> + struct ieee802154_sub_if_data *priv = netdev_priv(dev);
> +
> + BUG_ON(dev->type != ARPHRD_IEEE802154);
> +
> + write_lock(&priv->mib_lock);
> + priv->short_addr = val;
> + write_unlock(&priv->mib_lock);
> +}
> +void ieee802154_dev_set_channel(struct net_device *dev, u8 val)
> +{
> + struct ieee802154_sub_if_data *priv = netdev_priv(dev);
> +
> + BUG_ON(dev->type != ARPHRD_IEEE802154);
> +
> + write_lock(&priv->mib_lock);
> + priv->chan = val;
> + write_unlock(&priv->mib_lock);
> +}
> +
> +u8 ieee802154_dev_get_dsn(struct net_device *dev)
> +{
> + struct ieee802154_sub_if_data *priv = netdev_priv(dev);
> + u16 ret;
> +
> + BUG_ON(dev->type != ARPHRD_IEEE802154);
> +
> + write_lock(&priv->mib_lock);
> + ret = priv->dsn++;
> + write_unlock(&priv->mib_lock);
> +
> + return ret;
> +}
> +
> +u8 ieee802154_dev_get_bsn(struct net_device *dev)
> +{
> + struct ieee802154_sub_if_data *priv = netdev_priv(dev);
> + u16 ret;
> +
> + BUG_ON(dev->type != ARPHRD_IEEE802154);
> +
> + write_lock(&priv->mib_lock);
> + ret = priv->bsn++;
> + write_unlock(&priv->mib_lock);
> +
> + return ret;
> +}
> +
> +static int __init ieee802154_dev_init(void)
> +{
> + return rtnl_link_register(&wpan_link_ops);
> +}
> +module_init(ieee802154_dev_init);
> +
> +static void __exit ieee802154_dev_exit(void)
> +{
> + rtnl_link_unregister(&wpan_link_ops);
> +}
> +module_exit(ieee802154_dev_exit);
> +
> +MODULE_ALIAS_RTNL_LINK("wpan");
> +
> diff --git a/net/mac802154/mac802154.h b/net/mac802154/mac802154.h
> new file mode 100644
> index 0000000..f4e8d29
> --- /dev/null
> +++ b/net/mac802154/mac802154.h
> @@ -0,0 +1,85 @@
> +/*
> + * Copyright (C) 2007, 2008 Siemens AG
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2
> + * as published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License along
> + * with this program; if not, write to the Free Software Foundation, Inc.,
> + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
> + *
> + * Written by:
> + * Pavel Smolenskiy <pavel.smolenskiy@...il.com>
> + * Maxim Gorbachyov <maxim.gorbachev@...mens.com>
> + * Dmitry Eremin-Solenikov <dbaryshkov@...il.com>
> + */
> +#ifndef MAC802154_H
> +#define MAC802154_H
> +
> +#include <linux/spinlock.h>
> +struct ieee802154_priv {
> + struct ieee802154_dev hw;
> + struct ieee802154_ops *ops;
> +
> + struct net_device *netdev; /* mwpanX device */
> + int open_count;
> + /* As in mac80211 slaves list is modified:
> + * 1) under the RTNL
> + * 2) protected by slaves_mtx;
> + * 3) in an RCU manner
> + *
> + * So atomic readers can use any of this protection methods
> + */
> + struct list_head slaves;
> + struct mutex slaves_mtx;
> + /* This one is used for scanning and other
> + * jobs not to be interfered with serial driver */
> + struct workqueue_struct *dev_workqueue;
> +};
> +
> +#define ieee802154_to_priv(_hw) container_of(_hw, struct ieee802154_priv, hw)
> +
> +struct ieee802154_sub_if_data {
> + struct list_head list; /* the ieee802154_priv->slaves list */
> +
> + struct ieee802154_priv *hw;
> + struct net_device *dev;
> +
> + rwlock_t mib_lock;
> +
> + u16 pan_id;
> + u16 short_addr;
> +
> + u8 chan;
> +
> + /* MAC BSN field */
> + u8 bsn;
> + /* MAC BSN field */
> + u8 dsn;
> +};
> +
> +void ieee802154_drop_slaves(struct ieee802154_dev *hw);
> +
> +void ieee802154_subif_rx(struct ieee802154_dev *hw, struct sk_buff *skb);
> +
> +struct ieee802154_phy_cb {
> + u8 lqi;
> + u8 chan;
> +};
> +
> +static inline struct ieee802154_phy_cb *phy_cb(struct sk_buff *skb)
> +{
> + return (struct ieee802154_phy_cb *)skb->cb;
> +}
> +
> +extern struct ieee802154_mlme_ops mac802154_mlme;
> +
> +int ieee802154_process_cmd(struct net_device *dev, struct sk_buff *skb);
> +
> +#endif
> diff --git a/net/mac802154/mac_cmd.c b/net/mac802154/mac_cmd.c
> new file mode 100644
> index 0000000..8941628
> --- /dev/null
> +++ b/net/mac802154/mac_cmd.c
> @@ -0,0 +1,99 @@
> +/*
> + * MAC commands interface
> + *
> + * Copyright 2007, 2008 Siemens AG
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2
> + * as published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License along
> + * with this program; if not, write to the Free Software Foundation, Inc.,
> + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
> + *
> + * Written by:
> + * Sergey Lapin <slapin@...fans.org>
> + * Dmitry Eremin-Solenikov <dbaryshkov@...il.com>
> + */
> +
> +#include <linux/kernel.h>
> +#include <linux/skbuff.h>
> +#include <linux/if_arp.h>
> +#include <net/af_ieee802154.h>
> +#include <net/mac802154.h>
> +#include <net/ieee802154.h>
> +#include <net/ieee802154_netdev.h>
> +#include <net/nl802154.h>
> +
> +#include "mac802154.h"
> +#include "mib.h"
> +
> +int ieee802154_process_cmd(struct net_device *dev, struct sk_buff *skb)
> +{
> + pr_warning("ieee802154: command frames are not yet supported\n");
> + kfree_skb(skb);
> + return NET_RX_DROP;
> +}
> +
> +
> +static int ieee802154_mlme_assoc_req(struct net_device *dev,
> + struct ieee802154_addr *addr, u8 channel, u8 cap)
> +{
> + /* We simply emulate it here */
> + return ieee802154_nl_assoc_confirm(dev,
> + ieee802154_dev_get_short_addr(dev),
> + IEEE802154_SUCCESS);
> +}
> +
> +static int ieee802154_mlme_assoc_resp(struct net_device *dev,
> + struct ieee802154_addr *addr, u16 short_addr, u8 status)
> +{
> + return 0;
> +}
> +
> +static int ieee802154_mlme_disassoc_req(struct net_device *dev,
> + struct ieee802154_addr *addr, u8 reason)
> +{
> + return ieee802154_nl_disassoc_confirm(dev, IEEE802154_SUCCESS);
> +}
> +
> +static int ieee802154_mlme_start_req(struct net_device *dev,
> + struct ieee802154_addr *addr,
> + u8 channel,
> + u8 bcn_ord, u8 sf_ord, u8 pan_coord, u8 blx,
> + u8 coord_realign)
> +{
> + /* We don't emulate beacons here at all, so START should fail */
> + ieee802154_nl_start_confirm(dev, IEEE802154_INVALID_PARAMETER);
> + return 0;
> +}
> +
> +static int ieee802154_mlme_scan_req(struct net_device *dev, u8 type,
> + u32 channels,
> + u8 duration)
> +{
> + u8 edl[27] = {};
> + return ieee802154_nl_scan_confirm(dev, IEEE802154_SUCCESS, type,
> + channels,
> + type == IEEE802154_MAC_SCAN_ED ? edl : NULL);
> +}
> +
> +
> +struct ieee802154_mlme_ops mac802154_mlme = {
> + .assoc_req = ieee802154_mlme_assoc_req,
> + .assoc_resp = ieee802154_mlme_assoc_resp,
> + .disassoc_req = ieee802154_mlme_disassoc_req,
> + .start_req = ieee802154_mlme_start_req,
> + .scan_req = ieee802154_mlme_scan_req,
> +
> + .get_pan_id = ieee802154_dev_get_pan_id,
> + .get_short_addr = ieee802154_dev_get_short_addr,
> + .get_dsn = ieee802154_dev_get_dsn,
> + .get_bsn = ieee802154_dev_get_bsn,
> +};
> +
> diff --git a/net/mac802154/mdev.c b/net/mac802154/mdev.c
> new file mode 100644
> index 0000000..191e942
> --- /dev/null
> +++ b/net/mac802154/mdev.c
> @@ -0,0 +1,295 @@
> +/*
> + * Copyright (C) 2007, 2008 Siemens AG
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2
> + * as published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License along
> + * with this program; if not, write to the Free Software Foundation, Inc.,
> + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
> + *
> + */
> +
> +#include <linux/kernel.h>
> +#include <linux/netdevice.h>
> +#include <linux/if_arp.h>
> +#include <net/route.h>
> +
> +#include <net/af_ieee802154.h>
> +#include <net/mac802154.h>
> +
> +#include "mac802154.h"
> +
> +struct xmit_work {
> + struct sk_buff *skb;
> + struct work_struct work;
> + struct ieee802154_priv *priv;
> +};
> +
> +static void ieee802154_xmit_worker(struct work_struct *work)
> +{
> + struct xmit_work *xw = container_of(work, struct xmit_work, work);
> + int res;
> +
> + if (xw->priv->hw.current_channel != phy_cb(xw->skb)->chan) {
> + res = xw->priv->ops->set_channel(&xw->priv->hw,
> + phy_cb(xw->skb)->chan);
> + if (res) {
> + pr_debug("set_channel failed\n");
> + goto out;
> + }
> + }
> +
> + res = xw->priv->ops->xmit(&xw->priv->hw, xw->skb);
> +
> +out:
> + /* FIXME: result processing and/or requeue!!! */
> + dev_kfree_skb(xw->skb);
> +
> + kfree(xw);
> +}
> +
> +static int ieee802154_master_hard_start_xmit(struct sk_buff *skb,
> + struct net_device *dev)
> +{
> + struct ieee802154_priv *priv = netdev_priv(dev);
> + struct xmit_work *work;
> +
> + if (skb_cow_head(skb, priv->hw.extra_tx_headroom)) {
> + dev_kfree_skb(skb);
> + return NETDEV_TX_OK;
> + }
> +
> + work = kzalloc(sizeof(struct xmit_work), GFP_ATOMIC);
> + if (!work)
> + return NETDEV_TX_BUSY;
> +
> + INIT_WORK(&work->work, ieee802154_xmit_worker);
> + work->skb = skb;
> + work->priv = priv;
> +
> + queue_work(priv->dev_workqueue, &work->work);
> +
> + return NETDEV_TX_OK;
> +}
> +
> +static int ieee802154_master_open(struct net_device *dev)
> +{
> + int rc;
> + struct ieee802154_priv *priv = netdev_priv(dev);
> +
> + if (!priv) {
> + pr_debug("%s:%s: unable to get master private data\n",
> + __FILE__, __func__);
> + return -ENODEV;
> + }
> +
> + if (!priv->open_count)
> + return -EOPNOTSUPP;
> +
> + rc = priv->ops->start(&priv->hw);
> +
> + if (!rc)
> + netif_tx_start_all_queues(dev);
> +
> + return rc;
> +}
> +
> +static int ieee802154_master_close(struct net_device *dev)
> +{
> + struct ieee802154_priv *priv = netdev_priv(dev);
> + struct ieee802154_sub_if_data *sdata;
> +
> + ASSERT_RTNL();
> +
> + /* We are under RTNL, so it's fine to do this */
> + list_for_each_entry(sdata, &priv->slaves, list)
> + if (netif_running(sdata->dev))
> + dev_close(sdata->dev);
> +
> + priv->ops->stop(&priv->hw);
> +
> + return 0;
> +}
> +
> +static ssize_t ieee802154_netdev_show(const struct device *dev,
> + struct device_attribute *attr, char *buf,
> + ssize_t (*format)(const struct net_device *, char *))
> +{
> + struct net_device *netdev = to_net_dev(dev);
> + ssize_t ret = -EINVAL;
> +
> + if (netdev->reg_state <= NETREG_REGISTERED)
> + ret = (*format)(netdev, buf);
> +
> + return ret;
> +}
> +#define MASTER_SHOW(field, format_string) \
> +static ssize_t format_##field(const struct net_device *dev, char *buf) \
> +{ \
> + struct ieee802154_priv *priv = netdev_priv(dev); \
> + return sprintf(buf, format_string, priv->hw.field); \
> +} \
> +static ssize_t show_##field(struct device *dev, \
> + struct device_attribute *attr, char *buf) \
> +{ \
> + return ieee802154_netdev_show(dev, attr, buf, format_##field); \
> +} \
> +static DEVICE_ATTR(field, S_IRUGO, show_##field, NULL)
> +
> +static const char fmt_long_hex[] = "%#lx\n";
> +static const char fmt_hex[] = "%#x\n";
> +static const char fmt_dec[] = "%d\n";
> +
> +MASTER_SHOW(current_channel, fmt_dec);
> +MASTER_SHOW(channel_mask, fmt_hex);
> +
> +static struct attribute *pmib_attrs[] = {
> + &dev_attr_current_channel.attr,
> + &dev_attr_channel_mask.attr,
> + NULL
> +};
> +
> +static struct attribute_group pmib_group = {
> + .name = "pib",
> + .attrs = pmib_attrs,
> +};
> +
> +static const struct net_device_ops ieee802154_master_ops = {
> + .ndo_open = ieee802154_master_open,
> + .ndo_stop = ieee802154_master_close,
> + .ndo_start_xmit = ieee802154_master_hard_start_xmit,
> +};
> +
> +static void ieee802154_netdev_setup_master(struct net_device *dev)
> +{
> + dev->addr_len = 0;
> + dev->features = NETIF_F_NO_CSUM;
> + dev->hard_header_len = 0;
> + dev->mtu = 127;
> + dev->tx_queue_len = 0;
> + dev->type = ARPHRD_IEEE802154_PHY;
> + dev->flags = IFF_NOARP | IFF_BROADCAST;
> + dev->watchdog_timeo = 0;
> +
> + dev->netdev_ops = &ieee802154_master_ops;
> +}
> +
> +struct ieee802154_dev *ieee802154_alloc_device(size_t priv_size,
> + struct ieee802154_ops *ops)
> +{
> + struct net_device *dev;
> + struct ieee802154_priv *priv;
> +
> + dev = alloc_netdev(ALIGN(sizeof(*priv), NETDEV_ALIGN) + priv_size,
> + "mwpan%d", ieee802154_netdev_setup_master);
> + if (!dev) {
> + printk(KERN_ERR
> + "Failure to initialize master IEEE802154 device\n");
> + return NULL;
> + }
> + priv = netdev_priv(dev);
> + priv->netdev = dev;
> + priv->hw.priv = (char *)priv + ALIGN(sizeof(*priv), NETDEV_ALIGN);
> +
> + BUG_ON(!dev);
> + BUG_ON(!ops);
> + BUG_ON(!ops->xmit);
> + BUG_ON(!ops->ed);
> + BUG_ON(!ops->start);
> + BUG_ON(!ops->stop);
> +
> + if (!try_module_get(ops->owner)) {
> + free_netdev(dev);
> + return NULL;
> + }
> +
> + priv->ops = ops;
> +
> + INIT_LIST_HEAD(&priv->slaves);
> + mutex_init(&priv->slaves_mtx);
> +
> + return &priv->hw;
> +}
> +EXPORT_SYMBOL(ieee802154_alloc_device);
> +
> +void ieee802154_free_device(struct ieee802154_dev *hw)
> +{
> + struct ieee802154_priv *priv = ieee802154_to_priv(hw);
> +
> + BUG_ON(!list_empty(&priv->slaves));
> + BUG_ON(!priv->netdev);
> +
> + module_put(priv->ops->owner);
> +
> + free_netdev(priv->netdev);
> +}
> +EXPORT_SYMBOL(ieee802154_free_device);
> +
> +int ieee802154_register_device(struct ieee802154_dev *dev)
> +{
> + struct ieee802154_priv *priv = ieee802154_to_priv(dev);
> + struct net_device *ndev = priv->netdev;
> +
> + int rc;
> +
> + rtnl_lock();
> + if (strchr(ndev->name, '%')) {
> + rc = dev_alloc_name(ndev, ndev->name);
> + if (rc < 0)
> + goto out_unlock;
> + }
> +
> + priv->dev_workqueue =
> + create_singlethread_workqueue(ndev->name);
> + if (!priv->dev_workqueue) {
> + rc = -ENOMEM;
> + goto out_unlock;
> + }
> +
> + ndev->needed_headroom = priv->hw.extra_tx_headroom;
> + SET_NETDEV_DEV(ndev, priv->hw.parent);
> +
> + ndev->sysfs_groups[1] = &pmib_group;
> +
> + rc = register_netdevice(ndev);
> + if (rc < 0)
> + goto out_wq;
> +
> + rtnl_unlock();
> +
> + return 0;
> +
> +out_wq:
> + destroy_workqueue(priv->dev_workqueue);
> +out_unlock:
> + rtnl_unlock();
> + return rc;
> +}
> +EXPORT_SYMBOL(ieee802154_register_device);
> +
> +void ieee802154_unregister_device(struct ieee802154_dev *dev)
> +{
> + struct ieee802154_priv *priv = ieee802154_to_priv(dev);
> +
> + flush_workqueue(priv->dev_workqueue);
> + destroy_workqueue(priv->dev_workqueue);
> +
> + rtnl_lock();
> +
> + ieee802154_drop_slaves(dev);
> + unregister_netdevice(priv->netdev);
> +
> + rtnl_unlock();
> +}
> +EXPORT_SYMBOL(ieee802154_unregister_device);
> +
> +MODULE_DESCRIPTION("IEEE 802.15.4 implementation");
> +MODULE_LICENSE("GPL v2");
> +
> diff --git a/net/mac802154/mib.h b/net/mac802154/mib.h
> new file mode 100644
> index 0000000..57bf03f
> --- /dev/null
> +++ b/net/mac802154/mib.h
> @@ -0,0 +1,32 @@
> +/*
> + * Copyright 2008 Siemens AG
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2
> + * as published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License along
> + * with this program; if not, write to the Free Software Foundation, Inc.,
> + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
> + *
> + */
> +
> +#ifndef MIB802154_H
> +#define MIB802154_H
> +
> +/* FIXME: should be dropped in favour of generic MIB API */
> +u8 ieee802154_dev_get_dsn(struct net_device *dev);
> +u8 ieee802154_dev_get_bsn(struct net_device *dev);
> +u16 ieee802154_dev_get_pan_id(struct net_device *dev);
> +u16 ieee802154_dev_get_short_addr(struct net_device *dev);
> +void ieee802154_dev_set_pan_id(struct net_device *dev, u16 val);
> +void ieee802154_dev_set_short_addr(struct net_device *dev, u16 val);
> +void ieee802154_dev_set_channel(struct net_device *dev, u8 chan);
> +
> +
> +#endif
> diff --git a/net/mac802154/rx.c b/net/mac802154/rx.c
> new file mode 100644
> index 0000000..81a269e
> --- /dev/null
> +++ b/net/mac802154/rx.c
> @@ -0,0 +1,98 @@
> +/*
> + * Copyright (C) 2007, 2008, 2009 Siemens AG
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2
> + * as published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License along
> + * with this program; if not, write to the Free Software Foundation, Inc.,
> + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
> + *
> + * Written by:
> + * Pavel Smolenskiy <pavel.smolenskiy@...il.com>
> + * Maxim Gorbachyov <maxim.gorbachev@...mens.com>
> + * Dmitry Eremin-Solenikov <dbaryshkov@...il.com>
> + */
> +
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/workqueue.h>
> +#include <linux/netdevice.h>
> +
> +#include <net/mac802154.h>
> +
> +#include "mac802154.h"
> +
> +static void __ieee802154_rx_prepare(struct ieee802154_dev *dev,
> + struct sk_buff *skb, u8 lqi)
> +{
> + struct ieee802154_priv *priv = ieee802154_to_priv(dev);
> +
> + BUG_ON(!skb);
> +
> + phy_cb(skb)->lqi = lqi;
> +
> + skb->dev = priv->netdev;
> +
> + skb->iif = skb->dev->ifindex;
> +
> + skb->protocol = htons(ETH_P_IEEE802154);
> +
> + skb_reset_mac_header(skb);
> +}
> +
> +void ieee802154_rx(struct ieee802154_dev *dev, struct sk_buff *skb, u8 lqi)
> +{
> + struct sk_buff *skb2;
> +
> + __ieee802154_rx_prepare(dev, skb, lqi);
> +
> + skb2 = skb_clone(skb, GFP_KERNEL);
> + netif_rx(skb2);
> +
> + ieee802154_subif_rx(dev, skb);
> +}
> +EXPORT_SYMBOL(ieee802154_rx);
> +
> +struct rx_work {
> + struct sk_buff *skb;
> + struct work_struct work;
> + struct ieee802154_dev *dev;
> +};
> +
> +static void ieee802154_rx_worker(struct work_struct *work)
> +{
> + struct rx_work *rw = container_of(work, struct rx_work, work);
> + struct sk_buff *skb = rw->skb;
> +
> + struct sk_buff *skb2 = skb_clone(skb, GFP_KERNEL);
> + netif_rx(skb2);
> +
> + ieee802154_subif_rx(rw->dev, skb);
> + kfree(rw);
> +}
> +
> +void ieee802154_rx_irqsafe(struct ieee802154_dev *dev,
> + struct sk_buff *skb, u8 lqi)
> +{
> + struct ieee802154_priv *priv = ieee802154_to_priv(dev);
> + struct rx_work *work = kzalloc(sizeof(struct rx_work), GFP_ATOMIC);
> +
> + if (!work)
> + return;
> +
> + __ieee802154_rx_prepare(dev, skb, lqi);
> +
> + INIT_WORK(&work->work, ieee802154_rx_worker);
> + work->skb = skb;
> + work->dev = dev;
> +
> + queue_work(priv->dev_workqueue, &work->work);
> +}
> +EXPORT_SYMBOL(ieee802154_rx_irqsafe);
> --
> 1.6.3.3
>
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