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OpenCloudOS-Kernel/net/mac802154/wpan.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 int mac802154_wpan_update_llsec(struct net_device *dev)
{
struct mac802154_sub_if_data *priv = netdev_priv(dev);
struct ieee802154_mlme_ops *ops = ieee802154_mlme_ops(dev);
int rc = 0;
if (ops->llsec) {
struct ieee802154_llsec_params params;
int changed = 0;
params.pan_id = priv->pan_id;
changed |= IEEE802154_LLSEC_PARAM_PAN_ID;
params.hwaddr = priv->extended_addr;
changed |= IEEE802154_LLSEC_PARAM_HWADDR;
rc = ops->llsec->set_params(dev, &params, changed);
}
return rc;
}
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:
{
u16 pan_id, short_addr;
pan_id = le16_to_cpu(priv->pan_id);
short_addr = le16_to_cpu(priv->short_addr);
if (pan_id == IEEE802154_PANID_BROADCAST ||
short_addr == IEEE802154_ADDR_BROADCAST) {
err = -EADDRNOTAVAIL;
break;
}
sa->family = AF_IEEE802154;
sa->addr.addr_type = IEEE802154_ADDR_SHORT;
sa->addr.pan_id = pan_id;
sa->addr.short_addr = 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 = cpu_to_le16(sa->addr.pan_id);
priv->short_addr = cpu_to_le16(sa->addr.short_addr);
err = mac802154_wpan_update_llsec(dev);
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 mac802154_wpan_update_llsec(dev);
}
int mac802154_set_mac_params(struct net_device *dev,
const struct ieee802154_mac_params *params)
{
struct mac802154_sub_if_data *priv = netdev_priv(dev);
mutex_lock(&priv->hw->slaves_mtx);
priv->mac_params = *params;
mutex_unlock(&priv->hw->slaves_mtx);
return 0;
}
void mac802154_get_mac_params(struct net_device *dev,
struct ieee802154_mac_params *params)
{
struct mac802154_sub_if_data *priv = netdev_priv(dev);
mutex_lock(&priv->hw->slaves_mtx);
*params = priv->mac_params;
mutex_unlock(&priv->hw->slaves_mtx);
}
static int mac802154_wpan_open(struct net_device *dev)
{
int rc;
struct mac802154_sub_if_data *priv = netdev_priv(dev);
struct wpan_phy *phy = priv->hw->phy;
rc = mac802154_slave_open(dev);
if (rc < 0)
return rc;
mutex_lock(&phy->pib_lock);
if (phy->set_txpower) {
rc = phy->set_txpower(phy, priv->mac_params.transmit_power);
if (rc < 0)
goto out;
}
if (phy->set_lbt) {
rc = phy->set_lbt(phy, priv->mac_params.lbt);
if (rc < 0)
goto out;
}
if (phy->set_cca_mode) {
rc = phy->set_cca_mode(phy, priv->mac_params.cca_mode);
if (rc < 0)
goto out;
}
if (phy->set_cca_ed_level) {
rc = phy->set_cca_ed_level(phy, priv->mac_params.cca_ed_level);
if (rc < 0)
goto out;
}
if (phy->set_csma_params) {
rc = phy->set_csma_params(phy, priv->mac_params.min_be,
priv->mac_params.max_be,
priv->mac_params.csma_retries);
if (rc < 0)
goto out;
}
if (phy->set_frame_retries) {
rc = phy->set_frame_retries(phy,
priv->mac_params.frame_retries);
if (rc < 0)
goto out;
}
mutex_unlock(&phy->pib_lock);
return 0;
out:
mutex_unlock(&phy->pib_lock);
return rc;
}
static int mac802154_set_header_security(struct mac802154_sub_if_data *priv,
struct ieee802154_hdr *hdr,
const struct ieee802154_mac_cb *cb)
{
struct ieee802154_llsec_params params;
u8 level;
mac802154_llsec_get_params(&priv->sec, &params);
if (!params.enabled && cb->secen_override && cb->secen)
return -EINVAL;
if (!params.enabled ||
(cb->secen_override && !cb->secen) ||
!params.out_level)
return 0;
if (cb->seclevel_override && !cb->seclevel)
return -EINVAL;
level = cb->seclevel_override ? cb->seclevel : params.out_level;
hdr->fc.security_enabled = 1;
hdr->sec.level = level;
hdr->sec.key_id_mode = params.out_key.mode;
if (params.out_key.mode == IEEE802154_SCF_KEY_SHORT_INDEX)
hdr->sec.short_src = params.out_key.short_source;
else if (params.out_key.mode == IEEE802154_SCF_KEY_HW_INDEX)
hdr->sec.extended_src = params.out_key.extended_source;
hdr->sec.key_id = params.out_key.id;
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)
{
struct ieee802154_hdr hdr;
struct mac802154_sub_if_data *priv = netdev_priv(dev);
struct ieee802154_mac_cb *cb = mac_cb(skb);
int hlen;
if (!daddr)
return -EINVAL;
memset(&hdr.fc, 0, sizeof(hdr.fc));
hdr.fc.type = cb->type;
hdr.fc.security_enabled = cb->secen;
hdr.fc.ack_request = cb->ackreq;
hdr.seq = ieee802154_mlme_ops(dev)->get_dsn(dev);
if (mac802154_set_header_security(priv, &hdr, cb) < 0)
return -EINVAL;
if (!saddr) {
spin_lock_bh(&priv->mib_lock);
if (priv->short_addr == cpu_to_le16(IEEE802154_ADDR_BROADCAST) ||
priv->short_addr == cpu_to_le16(IEEE802154_ADDR_UNDEF) ||
priv->pan_id == cpu_to_le16(IEEE802154_PANID_BROADCAST)) {
hdr.source.mode = IEEE802154_ADDR_LONG;
hdr.source.extended_addr = priv->extended_addr;
} else {
hdr.source.mode = IEEE802154_ADDR_SHORT;
hdr.source.short_addr = priv->short_addr;
}
hdr.source.pan_id = priv->pan_id;
spin_unlock_bh(&priv->mib_lock);
} else {
hdr.source = *(const struct ieee802154_addr *)saddr;
}
hdr.dest = *(const struct ieee802154_addr *)daddr;
hlen = ieee802154_hdr_push(skb, &hdr);
if (hlen < 0)
return -EINVAL;
skb_reset_mac_header(skb);
skb->mac_len = hlen;
if (len > ieee802154_max_payload(&hdr))
return -EMSGSIZE;
return hlen;
}
static int
mac802154_header_parse(const struct sk_buff *skb, unsigned char *haddr)
{
struct ieee802154_hdr hdr;
struct ieee802154_addr *addr = (struct ieee802154_addr *)haddr;
if (ieee802154_hdr_peek_addrs(skb, &hdr) < 0) {
pr_debug("malformed packet\n");
return 0;
}
*addr = hdr.source;
return sizeof(*addr);
}
static netdev_tx_t
mac802154_wpan_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct mac802154_sub_if_data *priv;
u8 chan, page;
int rc;
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;
}
rc = mac802154_llsec_encrypt(&priv->sec, skb);
if (rc) {
pr_warn("encryption failed: %i\n", rc);
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_wpan_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,
};
static void mac802154_wpan_free(struct net_device *dev)
{
struct mac802154_sub_if_data *priv = netdev_priv(dev);
mac802154_llsec_destroy(&priv->sec);
free_netdev(dev);
}
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 + 16; /* FCS + MIC */
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 = mac802154_wpan_free;
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);
mutex_init(&priv->sec_mtx);
get_random_bytes(&priv->bsn, 1);
get_random_bytes(&priv->dsn, 1);
/* defaults per 802.15.4-2011 */
priv->mac_params.min_be = 3;
priv->mac_params.max_be = 5;
priv->mac_params.csma_retries = 4;
priv->mac_params.frame_retries = -1; /* for compatibility, actual default is 3 */
priv->pan_id = cpu_to_le16(IEEE802154_PANID_BROADCAST);
priv->short_addr = cpu_to_le16(IEEE802154_ADDR_BROADCAST);
mac802154_llsec_init(&priv->sec);
}
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,
const struct ieee802154_hdr *hdr)
{
__le16 span, sshort;
int rc;
pr_debug("getting packet via slave interface %s\n", sdata->dev->name);
spin_lock_bh(&sdata->mib_lock);
span = sdata->pan_id;
sshort = sdata->short_addr;
switch (mac_cb(skb)->dest.mode) {
case IEEE802154_ADDR_NONE:
if (mac_cb(skb)->dest.mode != 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)->dest.pan_id != span &&
mac_cb(skb)->dest.pan_id != cpu_to_le16(IEEE802154_PANID_BROADCAST))
skb->pkt_type = PACKET_OTHERHOST;
else if (mac_cb(skb)->dest.extended_addr == sdata->extended_addr)
skb->pkt_type = PACKET_HOST;
else
skb->pkt_type = PACKET_OTHERHOST;
break;
case IEEE802154_ADDR_SHORT:
if (mac_cb(skb)->dest.pan_id != span &&
mac_cb(skb)->dest.pan_id != cpu_to_le16(IEEE802154_PANID_BROADCAST))
skb->pkt_type = PACKET_OTHERHOST;
else if (mac_cb(skb)->dest.short_addr == sshort)
skb->pkt_type = PACKET_HOST;
else if (mac_cb(skb)->dest.short_addr ==
cpu_to_le16(IEEE802154_ADDR_BROADCAST))
skb->pkt_type = PACKET_BROADCAST;
else
skb->pkt_type = PACKET_OTHERHOST;
break;
default:
spin_unlock_bh(&sdata->mib_lock);
pr_debug("invalid dest mode\n");
kfree_skb(skb);
return NET_RX_DROP;
}
spin_unlock_bh(&sdata->mib_lock);
skb->dev = sdata->dev;
rc = mac802154_llsec_decrypt(&sdata->sec, skb);
if (rc) {
pr_debug("decryption failed: %i\n", rc);
goto fail;
}
sdata->dev->stats.rx_packets++;
sdata->dev->stats.rx_bytes += skb->len;
switch (mac_cb(skb)->type) {
case IEEE802154_FC_TYPE_DATA:
return mac802154_process_data(sdata->dev, skb);
default:
pr_warn("ieee802154: bad frame received (type = %d)\n",
mac_cb(skb)->type);
goto fail;
}
fail:
kfree_skb(skb);
return NET_RX_DROP;
}
static void mac802154_print_addr(const char *name,
const struct ieee802154_addr *addr)
{
if (addr->mode == IEEE802154_ADDR_NONE)
pr_debug("%s not present\n", name);
pr_debug("%s PAN ID: %04x\n", name, le16_to_cpu(addr->pan_id));
if (addr->mode == IEEE802154_ADDR_SHORT) {
pr_debug("%s is short: %04x\n", name,
le16_to_cpu(addr->short_addr));
} else {
u64 hw = swab64((__force u64) addr->extended_addr);
pr_debug("%s is hardware: %8phC\n", name, &hw);
}
}
static int mac802154_parse_frame_start(struct sk_buff *skb,
struct ieee802154_hdr *hdr)
{
int hlen;
struct ieee802154_mac_cb *cb = mac_cb_init(skb);
hlen = ieee802154_hdr_pull(skb, hdr);
if (hlen < 0)
return -EINVAL;
skb->mac_len = hlen;
pr_debug("fc: %04x dsn: %02x\n", le16_to_cpup((__le16 *)&hdr->fc),
hdr->seq);
cb->type = hdr->fc.type;
cb->ackreq = hdr->fc.ack_request;
cb->secen = hdr->fc.security_enabled;
mac802154_print_addr("destination", &hdr->dest);
mac802154_print_addr("source", &hdr->source);
cb->source = hdr->source;
cb->dest = hdr->dest;
if (hdr->fc.security_enabled) {
u64 key;
pr_debug("seclevel %i\n", hdr->sec.level);
switch (hdr->sec.key_id_mode) {
case IEEE802154_SCF_KEY_IMPLICIT:
pr_debug("implicit key\n");
break;
case IEEE802154_SCF_KEY_INDEX:
pr_debug("key %02x\n", hdr->sec.key_id);
break;
case IEEE802154_SCF_KEY_SHORT_INDEX:
pr_debug("key %04x:%04x %02x\n",
le32_to_cpu(hdr->sec.short_src) >> 16,
le32_to_cpu(hdr->sec.short_src) & 0xffff,
hdr->sec.key_id);
break;
case IEEE802154_SCF_KEY_HW_INDEX:
key = swab64((__force u64) hdr->sec.extended_src);
pr_debug("key source %8phC %02x\n", &key,
hdr->sec.key_id);
break;
}
}
return 0;
}
void mac802154_wpans_rx(struct mac802154_priv *priv, struct sk_buff *skb)
{
int ret;
struct mac802154_sub_if_data *sdata;
struct ieee802154_hdr hdr;
ret = mac802154_parse_frame_start(skb, &hdr);
if (ret) {
pr_debug("got invalid frame\n");
kfree_skb(skb);
return;
}
rcu_read_lock();
list_for_each_entry_rcu(sdata, &priv->slaves, list) {
if (sdata->type != IEEE802154_DEV_WPAN ||
!netif_running(sdata->dev))
continue;
mac802154_subif_frame(sdata, skb, &hdr);
skb = NULL;
break;
}
rcu_read_unlock();
if (skb)
kfree_skb(skb);
}
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