[net-next-2.6.git] / net / bluetooth / bnep / netdev.c

/*
   BNEP implementation for Linux Bluetooth stack (BlueZ).
   Copyright (C) 2001-2002 Inventel Systemes
   Written 2001-2002 by
	Clément Moreau <clement.moreau@inventel.fr>
	David Libault  <david.libault@inventel.fr>

   Copyright (C) 2002 Maxim Krasnyansky <maxk@qualcomm.com>

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License version 2 as
   published by the Free Software Foundation;

   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
   OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
   IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
   CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
   WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
   ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
   OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

   ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
   COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
   SOFTWARE IS DISCLAIMED.
*/

/*
 * $Id: netdev.c,v 1.8 2002/08/04 21:23:58 maxk Exp $
 */

#include <linux/module.h>

#include <linux/socket.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/wait.h>

#include <asm/unaligned.h>

#include <net/bluetooth/bluetooth.h>
#include <net/bluetooth/hci_core.h>
#include <net/bluetooth/l2cap.h>

#include "bnep.h"

#ifndef CONFIG_BT_BNEP_DEBUG
#undef  BT_DBG
#define BT_DBG( A... )
#endif

#define BNEP_TX_QUEUE_LEN 20

static int bnep_net_open(struct net_device *dev)
{
	netif_start_queue(dev);
	return 0;
}

static int bnep_net_close(struct net_device *dev)
{
	netif_stop_queue(dev);
	return 0;
}

static struct net_device_stats *bnep_net_get_stats(struct net_device *dev)
{
	struct bnep_session *s = dev->priv;
	return &s->stats;
}

static void bnep_net_set_mc_list(struct net_device *dev)
{
#ifdef CONFIG_BT_BNEP_MC_FILTER
	struct bnep_session *s = dev->priv;
	struct sock *sk = s->sock->sk;
	struct bnep_set_filter_req *r;
	struct sk_buff *skb;
	int size;

	BT_DBG("%s mc_count %d", dev->name, dev->mc_count);

	size = sizeof(*r) + (BNEP_MAX_MULTICAST_FILTERS + 1) * ETH_ALEN * 2;
	skb  = alloc_skb(size, GFP_ATOMIC);
	if (!skb) {
		BT_ERR("%s Multicast list allocation failed", dev->name);
		return;
	}

	r = (void *) skb->data;
	__skb_put(skb, sizeof(*r));

	r->type = BNEP_CONTROL;
	r->ctrl = BNEP_FILTER_MULTI_ADDR_SET;

	if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
		u8 start[ETH_ALEN] = { 0x01 };

		/* Request all addresses */
		memcpy(__skb_put(skb, ETH_ALEN), start, ETH_ALEN);
		memcpy(__skb_put(skb, ETH_ALEN), dev->broadcast, ETH_ALEN);
		r->len = htons(ETH_ALEN * 2);
	} else {
		struct dev_mc_list *dmi = dev->mc_list;
		int i, len = skb->len;

		if (dev->flags & IFF_BROADCAST) {
			memcpy(__skb_put(skb, ETH_ALEN), dev->broadcast, ETH_ALEN);
			memcpy(__skb_put(skb, ETH_ALEN), dev->broadcast, ETH_ALEN);
		}

		/* FIXME: We should group addresses here. */

		for (i = 0; i < dev->mc_count && i < BNEP_MAX_MULTICAST_FILTERS; i++) {
			memcpy(__skb_put(skb, ETH_ALEN), dmi->dmi_addr, ETH_ALEN);
			memcpy(__skb_put(skb, ETH_ALEN), dmi->dmi_addr, ETH_ALEN);
			dmi = dmi->next;
		}
		r->len = htons(skb->len - len);
	}

	skb_queue_tail(&sk->sk_write_queue, skb);
	wake_up_interruptible(sk->sk_sleep);
#endif
}

static int bnep_net_set_mac_addr(struct net_device *dev, void *arg)
{
	BT_DBG("%s", dev->name);
	return 0;
}

static void bnep_net_timeout(struct net_device *dev)
{
	BT_DBG("net_timeout");
	netif_wake_queue(dev);
}

static int bnep_net_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
{
	return -EINVAL;
}

#ifdef CONFIG_BT_BNEP_MC_FILTER
static inline int bnep_net_mc_filter(struct sk_buff *skb, struct bnep_session *s)
{
	struct ethhdr *eh = (void *) skb->data;

	if ((eh->h_dest[0] & 1) && !test_bit(bnep_mc_hash(eh->h_dest), (ulong *) &s->mc_filter))
		return 1;
	return 0;
}
#endif

#ifdef CONFIG_BT_BNEP_PROTO_FILTER
/* Determine ether protocol. Based on eth_type_trans. */
static inline u16 bnep_net_eth_proto(struct sk_buff *skb)
{
	struct ethhdr *eh = (void *) skb->data;
	u16 proto = ntohs(eh->h_proto);

	if (proto >= 1536)
		return proto;

	if (get_unaligned((__be16 *) skb->data) == htons(0xFFFF))
		return ETH_P_802_3;

	return ETH_P_802_2;
}

static inline int bnep_net_proto_filter(struct sk_buff *skb, struct bnep_session *s)
{
	u16 proto = bnep_net_eth_proto(skb);
	struct bnep_proto_filter *f = s->proto_filter;
	int i;

	for (i = 0; i < BNEP_MAX_PROTO_FILTERS && f[i].end; i++) {
		if (proto >= f[i].start && proto <= f[i].end)
			return 0;
	}

	BT_DBG("BNEP: filtered skb %p, proto 0x%.4x", skb, proto);
	return 1;
}
#endif

static int bnep_net_xmit(struct sk_buff *skb, struct net_device *dev)
{
	struct bnep_session *s = dev->priv;
	struct sock *sk = s->sock->sk;

	BT_DBG("skb %p, dev %p", skb, dev);

#ifdef CONFIG_BT_BNEP_MC_FILTER
	if (bnep_net_mc_filter(skb, s)) {
		kfree_skb(skb);
		return 0;
	}
#endif

#ifdef CONFIG_BT_BNEP_PROTO_FILTER
	if (bnep_net_proto_filter(skb, s)) {
		kfree_skb(skb);
		return 0;
	}
#endif

	/*
	 * We cannot send L2CAP packets from here as we are potentially in a bh.
	 * So we have to queue them and wake up session thread which is sleeping
	 * on the sk->sk_sleep.
	 */
	dev->trans_start = jiffies;
	skb_queue_tail(&sk->sk_write_queue, skb);
	wake_up_interruptible(sk->sk_sleep);

	if (skb_queue_len(&sk->sk_write_queue) >= BNEP_TX_QUEUE_LEN) {
		BT_DBG("tx queue is full");

		/* Stop queuing.
		 * Session thread will do netif_wake_queue() */
		netif_stop_queue(dev);
	}

	return 0;
}

void bnep_net_setup(struct net_device *dev)
{

	memset(dev->broadcast, 0xff, ETH_ALEN);
	dev->addr_len = ETH_ALEN;

	ether_setup(dev);

	dev->open            = bnep_net_open;
	dev->stop            = bnep_net_close;
	dev->hard_start_xmit = bnep_net_xmit;
	dev->get_stats       = bnep_net_get_stats;
	dev->do_ioctl        = bnep_net_ioctl;
	dev->set_mac_address = bnep_net_set_mac_addr;
	dev->set_multicast_list = bnep_net_set_mc_list;

	dev->watchdog_timeo  = HZ * 2;
	dev->tx_timeout      = bnep_net_timeout;
}
Commit	Line	Data
8e87d142	1	/*
1da177e4 LT	2	BNEP implementation for Linux Bluetooth stack (BlueZ).
	3	Copyright (C) 2001-2002 Inventel Systemes
	4	Written 2001-2002 by
96de0e25	5	Clément Moreau <clement.moreau@inventel.fr>
1da177e4 LT	6	David Libault <david.libault@inventel.fr>
	7
	8	Copyright (C) 2002 Maxim Krasnyansky <maxk@qualcomm.com>
	9
	10	This program is free software; you can redistribute it and/or modify
	11	it under the terms of the GNU General Public License version 2 as
	12	published by the Free Software Foundation;
	13
	14	THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
	15	OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	16	FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
	17	IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
8e87d142 YH	18	CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
	19	WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
	20	ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
1da177e4 LT	21	OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
1da177e4 LT	22
8e87d142 YH	23	ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
8e87d142 YH	24	COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
1da177e4 LT	25	SOFTWARE IS DISCLAIMED.
	26	*/
	27
	28	/*
	29	* $Id: netdev.c,v 1.8 2002/08/04 21:23:58 maxk Exp $
8e87d142	30	*/
1da177e4	31
1da177e4 LT	32	#include <linux/module.h>
	33
	34	#include <linux/socket.h>
	35	#include <linux/netdevice.h>
	36	#include <linux/etherdevice.h>
	37	#include <linux/skbuff.h>
	38	#include <linux/wait.h>
	39
	40	#include <asm/unaligned.h>
	41
	42	#include <net/bluetooth/bluetooth.h>
	43	#include <net/bluetooth/hci_core.h>
	44	#include <net/bluetooth/l2cap.h>
	45
	46	#include "bnep.h"
	47
	48	#ifndef CONFIG_BT_BNEP_DEBUG
	49	#undef BT_DBG
	50	#define BT_DBG( A... )
	51	#endif
	52
	53	#define BNEP_TX_QUEUE_LEN 20
	54
	55	static int bnep_net_open(struct net_device *dev)
	56	{
	57	netif_start_queue(dev);
	58	return 0;
	59	}
	60
	61	static int bnep_net_close(struct net_device *dev)
	62	{
	63	netif_stop_queue(dev);
	64	return 0;
	65	}
	66
	67	static struct net_device_stats bnep_net_get_stats(struct net_device dev)
	68	{
	69	struct bnep_session *s = dev->priv;
	70	return &s->stats;
	71	}
	72
	73	static void bnep_net_set_mc_list(struct net_device *dev)
	74	{
	75	#ifdef CONFIG_BT_BNEP_MC_FILTER
	76	struct bnep_session *s = dev->priv;
	77	struct sock *sk = s->sock->sk;
	78	struct bnep_set_filter_req *r;
	79	struct sk_buff *skb;
	80	int size;
	81
	82	BT_DBG("%s mc_count %d", dev->name, dev->mc_count);
	83
	84	size = sizeof(r) + (BNEP_MAX_MULTICAST_FILTERS + 1) ETH_ALEN * 2;
	85	skb = alloc_skb(size, GFP_ATOMIC);
	86	if (!skb) {
	87	BT_ERR("%s Multicast list allocation failed", dev->name);
	88	return;
	89	}
	90
	91	r = (void *) skb->data;
	92	__skb_put(skb, sizeof(*r));
	93
	94	r->type = BNEP_CONTROL;
	95	r->ctrl = BNEP_FILTER_MULTI_ADDR_SET;
96
8e87d142	97	if (dev->flags & (IFF_PROMISC \| IFF_ALLMULTI)) {
1da177e4 LT	98	u8 start[ETH_ALEN] = { 0x01 };
	99
	100	/* Request all addresses */
	101	memcpy(__skb_put(skb, ETH_ALEN), start, ETH_ALEN);
	102	memcpy(__skb_put(skb, ETH_ALEN), dev->broadcast, ETH_ALEN);
	103	r->len = htons(ETH_ALEN * 2);
	104	} else {
8e87d142	105	struct dev_mc_list *dmi = dev->mc_list;
1da177e4 LT	106	int i, len = skb->len;
	107
	108	if (dev->flags & IFF_BROADCAST) {
	109	memcpy(__skb_put(skb, ETH_ALEN), dev->broadcast, ETH_ALEN);
	110	memcpy(__skb_put(skb, ETH_ALEN), dev->broadcast, ETH_ALEN);
8e87d142 YH	111	}
8e87d142 YH	112
1da177e4 LT	113	/* FIXME: We should group addresses here. */
	114
	115	for (i = 0; i < dev->mc_count && i < BNEP_MAX_MULTICAST_FILTERS; i++) {
	116	memcpy(__skb_put(skb, ETH_ALEN), dmi->dmi_addr, ETH_ALEN);
	117	memcpy(__skb_put(skb, ETH_ALEN), dmi->dmi_addr, ETH_ALEN);
	118	dmi = dmi->next;
	119	}
	120	r->len = htons(skb->len - len);
	121	}
	122
	123	skb_queue_tail(&sk->sk_write_queue, skb);
	124	wake_up_interruptible(sk->sk_sleep);
	125	#endif
	126	}
	127
	128	static int bnep_net_set_mac_addr(struct net_device dev, void arg)
	129	{
	130	BT_DBG("%s", dev->name);
	131	return 0;
	132	}
	133
	134	static void bnep_net_timeout(struct net_device *dev)
	135	{
	136	BT_DBG("net_timeout");
	137	netif_wake_queue(dev);
	138	}
	139
	140	static int bnep_net_ioctl(struct net_device dev, struct ifreq ifr, int cmd)
	141	{
	142	return -EINVAL;
	143	}
	144
	145	#ifdef CONFIG_BT_BNEP_MC_FILTER
	146	static inline int bnep_net_mc_filter(struct sk_buff skb, struct bnep_session s)
	147	{
	148	struct ethhdr eh = (void ) skb->data;
	149
	150	if ((eh->h_dest[0] & 1) && !test_bit(bnep_mc_hash(eh->h_dest), (ulong *) &s->mc_filter))
	151	return 1;
	152	return 0;
	153	}
	154	#endif
	155
	156	#ifdef CONFIG_BT_BNEP_PROTO_FILTER
	157	/* Determine ether protocol. Based on eth_type_trans. */
	158	static inline u16 bnep_net_eth_proto(struct sk_buff *skb)
	159	{
	160	struct ethhdr eh = (void ) skb->data;
e41d2169	161	u16 proto = ntohs(eh->h_proto);
8e87d142	162
e41d2169 AV	163	if (proto >= 1536)
e41d2169 AV	164	return proto;
8e87d142	165
e41d2169 AV	166	if (get_unaligned((__be16 *) skb->data) == htons(0xFFFF))
e41d2169 AV	167	return ETH_P_802_3;
8e87d142	168
e41d2169	169	return ETH_P_802_2;
1da177e4 LT	170	}
	171
	172	static inline int bnep_net_proto_filter(struct sk_buff skb, struct bnep_session s)
	173	{
	174	u16 proto = bnep_net_eth_proto(skb);
	175	struct bnep_proto_filter *f = s->proto_filter;
	176	int i;
8e87d142	177
1da177e4 LT	178	for (i = 0; i < BNEP_MAX_PROTO_FILTERS && f[i].end; i++) {
	179	if (proto >= f[i].start && proto <= f[i].end)
	180	return 0;
	181	}
	182
	183	BT_DBG("BNEP: filtered skb %p, proto 0x%.4x", skb, proto);
	184	return 1;
	185	}
	186	#endif
	187
	188	static int bnep_net_xmit(struct sk_buff skb, struct net_device dev)
	189	{
	190	struct bnep_session *s = dev->priv;
	191	struct sock *sk = s->sock->sk;
	192
	193	BT_DBG("skb %p, dev %p", skb, dev);
	194
	195	#ifdef CONFIG_BT_BNEP_MC_FILTER
	196	if (bnep_net_mc_filter(skb, s)) {
	197	kfree_skb(skb);
	198	return 0;
	199	}
	200	#endif
8e87d142	201
1da177e4 LT	202	#ifdef CONFIG_BT_BNEP_PROTO_FILTER
	203	if (bnep_net_proto_filter(skb, s)) {
	204	kfree_skb(skb);
	205	return 0;
	206	}
	207	#endif
8e87d142	208
1da177e4 LT	209	/*
	210	* We cannot send L2CAP packets from here as we are potentially in a bh.
	211	* So we have to queue them and wake up session thread which is sleeping
	212	* on the sk->sk_sleep.
	213	*/
	214	dev->trans_start = jiffies;
	215	skb_queue_tail(&sk->sk_write_queue, skb);
	216	wake_up_interruptible(sk->sk_sleep);
	217
	218	if (skb_queue_len(&sk->sk_write_queue) >= BNEP_TX_QUEUE_LEN) {
	219	BT_DBG("tx queue is full");
	220
	221	/* Stop queuing.
	222	* Session thread will do netif_wake_queue() */
	223	netif_stop_queue(dev);
	224	}
	225
	226	return 0;
	227	}
	228
	229	void bnep_net_setup(struct net_device *dev)
	230	{
	231
	232	memset(dev->broadcast, 0xff, ETH_ALEN);
	233	dev->addr_len = ETH_ALEN;
	234
	235	ether_setup(dev);
	236
	237	dev->open = bnep_net_open;
	238	dev->stop = bnep_net_close;
	239	dev->hard_start_xmit = bnep_net_xmit;
	240	dev->get_stats = bnep_net_get_stats;
	241	dev->do_ioctl = bnep_net_ioctl;
	242	dev->set_mac_address = bnep_net_set_mac_addr;
	243	dev->set_multicast_list = bnep_net_set_mc_list;
	244
	245	dev->watchdog_timeo = HZ * 2;
	246	dev->tx_timeout = bnep_net_timeout;
	247	}