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linux/net/mac802154/wpan.c
Alan Ott e937f583ec mac802154: Increase tx_buffer_len 
Increase the buffer length from 10 to 300 packets. Consider that traffic on
mac802154 devices will often be 6LoWPAN, and a full-length (1280 octet)
IPv6 packet will fragment into 15 6LoWPAN fragments (because the MTU of
IEEE 802.15.4 is 127).  A 300-packet queue is really 20 full-length IPv6
packets.

With a queue length of 10, an entire IPv6 packet was unable to get queued
at one time, causing fragments to be dropped, and making reassembly
impossible.

Signed-off-by: Alan Ott <alan@signal11.us>
Signed-off-by: David S. Miller <davem@davemloft.net>
2013-04-07 17:06:43 -04:00

559 lines
13 KiB
C
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/*
* Copyright 2007-2012 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:
* Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
* Sergey Lapin <slapin@ossfans.org>
* Maxim Gorbachyov <maxim.gorbachev@siemens.com>
* Alexander Smirnov <alex.bluesman.smirnov@gmail.com>
*/
#include <linux/netdevice.h>
#include <linux/module.h>
#include <linux/if_arp.h>
#include <net/rtnetlink.h>
#include <linux/nl802154.h>
#include <net/af_ieee802154.h>
#include <net/mac802154.h>
#include <net/ieee802154_netdev.h>
#include <net/ieee802154.h>
#include <net/wpan-phy.h>
#include "mac802154.h"
static inline int mac802154_fetch_skb_u8(struct sk_buff *skb, u8 *val)
{
if (unlikely(!pskb_may_pull(skb, 1)))
return -EINVAL;
*val = skb->data[0];
skb_pull(skb, 1);
return 0;
}
static inline int mac802154_fetch_skb_u16(struct sk_buff *skb, u16 *val)
{
if (unlikely(!pskb_may_pull(skb, 2)))
return -EINVAL;
*val = skb->data[0] | (skb->data[1] << 8);
skb_pull(skb, 2);
return 0;
}
static inline void mac802154_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
mac802154_wpan_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
{
struct mac802154_sub_if_data *priv = netdev_priv(dev);
struct sockaddr_ieee802154 *sa =
(struct sockaddr_ieee802154 *)&ifr->ifr_addr;
int err = -ENOIOCTLCMD;
spin_lock_bh(&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;
}
spin_unlock_bh(&priv->mib_lock);
return err;
}
static int mac802154_wpan_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);
mac802154_dev_set_ieee_addr(dev);
return 0;
}
static int mac802154_header_create(struct sk_buff *skb,
struct net_device *dev,
unsigned short type,
const void *_daddr,
const void *_saddr,
unsigned len)
{
const struct ieee802154_addr *saddr = _saddr;
const struct ieee802154_addr *daddr = _daddr;
struct ieee802154_addr dev_addr;
struct mac802154_sub_if_data *priv = netdev_priv(dev);
int pos = 2;
u8 head[MAC802154_FRAME_HARD_HEADER_LEN];
u16 fc;
if (!daddr)
return -EINVAL;
head[pos++] = mac_cb(skb)->seq; /* DSN/BSN */
fc = mac_cb_type(skb);
if (mac_cb_is_ackreq(skb))
fc |= IEEE802154_FC_ACK_REQ;
if (!saddr) {
spin_lock_bh(&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;
spin_unlock_bh(&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 {
mac802154_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 {
mac802154_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
mac802154_header_parse(const struct sk_buff *skb, unsigned char *haddr)
{
const u8 *hdr = skb_mac_header(skb);
const u8 *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 (fc & IEEE802154_FC_INTRA_PAN) {
if (hdr + 2 > tail)
goto malformed;
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 (fc & IEEE802154_FC_INTRA_PAN) {
if (hdr + 2 > tail)
goto malformed;
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 (!(fc & IEEE802154_FC_INTRA_PAN)) {
if (hdr + 2 > tail)
goto malformed;
addr->pan_id = hdr[0] | (hdr[1] << 8);
hdr += 2;
}
if (hdr + IEEE802154_ADDR_LEN > tail)
goto malformed;
mac802154_haddr_copy_swap(addr->hwaddr, hdr);
hdr += IEEE802154_ADDR_LEN;
break;
case IEEE802154_ADDR_SHORT:
if (!(fc & IEEE802154_FC_INTRA_PAN)) {
if (hdr + 2 > tail)
goto malformed;
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 netdev_tx_t
mac802154_wpan_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct mac802154_sub_if_data *priv;
u8 chan, page;
priv = netdev_priv(dev);
spin_lock_bh(&priv->mib_lock);
chan = priv->chan;
page = priv->page;
spin_unlock_bh(&priv->mib_lock);
if (chan == MAC802154_CHAN_NONE ||
page >= WPAN_NUM_PAGES ||
chan >= WPAN_NUM_CHANNELS) {
kfree_skb(skb);
return NETDEV_TX_OK;
}
skb->skb_iif = dev->ifindex;
dev->stats.tx_packets++;
dev->stats.tx_bytes += skb->len;
return mac802154_tx(priv->hw, skb, page, chan);
}
static struct header_ops mac802154_header_ops = {
.create = mac802154_header_create,
.parse = mac802154_header_parse,
};
static const struct net_device_ops mac802154_wpan_ops = {
.ndo_open = mac802154_slave_open,
.ndo_stop = mac802154_slave_close,
.ndo_start_xmit = mac802154_wpan_xmit,
.ndo_do_ioctl = mac802154_wpan_ioctl,
.ndo_set_mac_address = mac802154_wpan_mac_addr,
};
void mac802154_wpan_setup(struct net_device *dev)
{
struct mac802154_sub_if_data *priv;
dev->addr_len = IEEE802154_ADDR_LEN;
memset(dev->broadcast, 0xff, IEEE802154_ADDR_LEN);
dev->hard_header_len = MAC802154_FRAME_HARD_HEADER_LEN;
dev->header_ops = &mac802154_header_ops;
dev->needed_tailroom = 2; /* FCS */
dev->mtu = IEEE802154_MTU;
dev->tx_queue_len = 300;
dev->type = ARPHRD_IEEE802154;
dev->flags = IFF_NOARP | IFF_BROADCAST;
dev->watchdog_timeo = 0;
dev->destructor = free_netdev;
dev->netdev_ops = &mac802154_wpan_ops;
dev->ml_priv = &mac802154_mlme_wpan;
priv = netdev_priv(dev);
priv->type = IEEE802154_DEV_WPAN;
priv->chan = MAC802154_CHAN_NONE;
priv->page = 0;
spin_lock_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;
}
static int mac802154_process_data(struct net_device *dev, struct sk_buff *skb)
{
return netif_rx_ni(skb);
}
static int
mac802154_subif_frame(struct mac802154_sub_if_data *sdata, struct sk_buff *skb)
{
pr_debug("getting packet via slave interface %s\n", sdata->dev->name);
spin_lock_bh(&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;
default:
break;
}
spin_unlock_bh(&sdata->mib_lock);
skb->dev = sdata->dev;
sdata->dev->stats.rx_packets++;
sdata->dev->stats.rx_bytes += skb->len;
switch (mac_cb_type(skb)) {
case IEEE802154_FC_TYPE_DATA:
return mac802154_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 int mac802154_parse_frame_start(struct sk_buff *skb)
{
u8 *head = skb->data;
u16 fc;
if (mac802154_fetch_skb_u16(skb, &fc) ||
mac802154_fetch_skb_u8(skb, &(mac_cb(skb)->seq)))
goto err;
pr_debug("fc: %04x dsn: %02x\n", fc, head[2]);
mac_cb(skb)->flags = IEEE802154_FC_TYPE(fc);
mac_cb(skb)->sa.addr_type = IEEE802154_FC_SAMODE(fc);
mac_cb(skb)->da.addr_type = IEEE802154_FC_DAMODE(fc);
if (fc & IEEE802154_FC_INTRA_PAN)
mac_cb(skb)->flags |= MAC_CB_FLAG_INTRAPAN;
if (mac_cb(skb)->da.addr_type != IEEE802154_ADDR_NONE) {
if (mac802154_fetch_skb_u16(skb, &(mac_cb(skb)->da.pan_id)))
goto err;
/* source PAN id compression */
if (mac_cb_is_intrapan(skb))
mac_cb(skb)->sa.pan_id = mac_cb(skb)->da.pan_id;
pr_debug("dest PAN addr: %04x\n", mac_cb(skb)->da.pan_id);
if (mac_cb(skb)->da.addr_type == IEEE802154_ADDR_SHORT) {
u16 *da = &(mac_cb(skb)->da.short_addr);
if (mac802154_fetch_skb_u16(skb, da))
goto err;
pr_debug("destination address is short: %04x\n",
mac_cb(skb)->da.short_addr);
} else {
if (!pskb_may_pull(skb, IEEE802154_ADDR_LEN))
goto err;
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();
}
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