[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.
*/

#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"

#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 void bnep_net_set_mc_list(struct net_device *dev)
{
#ifdef CONFIG_BT_BNEP_MC_FILTER
	struct bnep_session *s = netdev_priv(dev);
	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);
}

#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 = netdev_priv(dev);
	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 NETDEV_TX_OK;
	}
#endif

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

static const struct net_device_ops bnep_netdev_ops = {
	.ndo_open            = bnep_net_open,
	.ndo_stop            = bnep_net_close,
	.ndo_start_xmit	     = bnep_net_xmit,
	.ndo_validate_addr   = eth_validate_addr,
	.ndo_set_multicast_list = bnep_net_set_mc_list,
	.ndo_set_mac_address = bnep_net_set_mac_addr,
	.ndo_tx_timeout      = bnep_net_timeout,
	.ndo_change_mtu	     = eth_change_mtu,

};

void bnep_net_setup(struct net_device *dev)
{

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

	ether_setup(dev);
	dev->netdev_ops = &bnep_netdev_ops;

	dev->watchdog_timeo  = HZ * 2;
}
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
1da177e4 LT	28	#include <linux/module.h>
	29
	30	#include <linux/socket.h>
	31	#include <linux/netdevice.h>
	32	#include <linux/etherdevice.h>
	33	#include <linux/skbuff.h>
	34	#include <linux/wait.h>
	35
	36	#include <asm/unaligned.h>
	37
	38	#include <net/bluetooth/bluetooth.h>
	39	#include <net/bluetooth/hci_core.h>
	40	#include <net/bluetooth/l2cap.h>
	41
	42	#include "bnep.h"
	43
1da177e4 LT	44	#define BNEP_TX_QUEUE_LEN 20
	45
	46	static int bnep_net_open(struct net_device *dev)
	47	{
	48	netif_start_queue(dev);
	49	return 0;
	50	}
	51
	52	static int bnep_net_close(struct net_device *dev)
	53	{
	54	netif_stop_queue(dev);
	55	return 0;
	56	}
	57
1da177e4 LT	58	static void bnep_net_set_mc_list(struct net_device *dev)
	59	{
	60	#ifdef CONFIG_BT_BNEP_MC_FILTER
524ad0a7	61	struct bnep_session *s = netdev_priv(dev);
1da177e4 LT	62	struct sock *sk = s->sock->sk;
	63	struct bnep_set_filter_req *r;
	64	struct sk_buff *skb;
	65	int size;
	66
	67	BT_DBG("%s mc_count %d", dev->name, dev->mc_count);
	68
	69	size = sizeof(r) + (BNEP_MAX_MULTICAST_FILTERS + 1) ETH_ALEN * 2;
	70	skb = alloc_skb(size, GFP_ATOMIC);
	71	if (!skb) {
	72	BT_ERR("%s Multicast list allocation failed", dev->name);
	73	return;
	74	}
	75
	76	r = (void *) skb->data;
	77	__skb_put(skb, sizeof(*r));
	78
	79	r->type = BNEP_CONTROL;
	80	r->ctrl = BNEP_FILTER_MULTI_ADDR_SET;
	81
8e87d142	82	if (dev->flags & (IFF_PROMISC \| IFF_ALLMULTI)) {
1da177e4 LT	83	u8 start[ETH_ALEN] = { 0x01 };
	84
	85	/* Request all addresses */
	86	memcpy(__skb_put(skb, ETH_ALEN), start, ETH_ALEN);
	87	memcpy(__skb_put(skb, ETH_ALEN), dev->broadcast, ETH_ALEN);
	88	r->len = htons(ETH_ALEN * 2);
	89	} else {
8e87d142	90	struct dev_mc_list *dmi = dev->mc_list;
1da177e4 LT	91	int i, len = skb->len;
	92
	93	if (dev->flags & IFF_BROADCAST) {
	94	memcpy(__skb_put(skb, ETH_ALEN), dev->broadcast, ETH_ALEN);
	95	memcpy(__skb_put(skb, ETH_ALEN), dev->broadcast, ETH_ALEN);
8e87d142 YH	96	}
8e87d142 YH	97
1da177e4 LT	98	/* FIXME: We should group addresses here. */
	99
	100	for (i = 0; i < dev->mc_count && i < BNEP_MAX_MULTICAST_FILTERS; i++) {
	101	memcpy(__skb_put(skb, ETH_ALEN), dmi->dmi_addr, ETH_ALEN);
	102	memcpy(__skb_put(skb, ETH_ALEN), dmi->dmi_addr, ETH_ALEN);
	103	dmi = dmi->next;
	104	}
	105	r->len = htons(skb->len - len);
	106	}
	107
	108	skb_queue_tail(&sk->sk_write_queue, skb);
	109	wake_up_interruptible(sk->sk_sleep);
	110	#endif
	111	}
	112
	113	static int bnep_net_set_mac_addr(struct net_device dev, void arg)
	114	{
	115	BT_DBG("%s", dev->name);
	116	return 0;
	117	}
	118
	119	static void bnep_net_timeout(struct net_device *dev)
	120	{
	121	BT_DBG("net_timeout");
	122	netif_wake_queue(dev);
	123	}
	124
1da177e4 LT	125	#ifdef CONFIG_BT_BNEP_MC_FILTER
	126	static inline int bnep_net_mc_filter(struct sk_buff skb, struct bnep_session s)
	127	{
	128	struct ethhdr eh = (void ) skb->data;
	129
	130	if ((eh->h_dest[0] & 1) && !test_bit(bnep_mc_hash(eh->h_dest), (ulong *) &s->mc_filter))
	131	return 1;
	132	return 0;
	133	}
	134	#endif
	135
	136	#ifdef CONFIG_BT_BNEP_PROTO_FILTER
	137	/* Determine ether protocol. Based on eth_type_trans. */
	138	static inline u16 bnep_net_eth_proto(struct sk_buff *skb)
	139	{
	140	struct ethhdr eh = (void ) skb->data;
e41d2169	141	u16 proto = ntohs(eh->h_proto);
8e87d142	142
e41d2169 AV	143	if (proto >= 1536)
e41d2169 AV	144	return proto;
8e87d142	145
e41d2169 AV	146	if (get_unaligned((__be16 *) skb->data) == htons(0xFFFF))
e41d2169 AV	147	return ETH_P_802_3;
8e87d142	148
e41d2169	149	return ETH_P_802_2;
1da177e4 LT	150	}
	151
	152	static inline int bnep_net_proto_filter(struct sk_buff skb, struct bnep_session s)
	153	{
	154	u16 proto = bnep_net_eth_proto(skb);
	155	struct bnep_proto_filter *f = s->proto_filter;
	156	int i;
8e87d142	157
1da177e4 LT	158	for (i = 0; i < BNEP_MAX_PROTO_FILTERS && f[i].end; i++) {
	159	if (proto >= f[i].start && proto <= f[i].end)
	160	return 0;
	161	}
	162
	163	BT_DBG("BNEP: filtered skb %p, proto 0x%.4x", skb, proto);
	164	return 1;
	165	}
	166	#endif
	167
	168	static int bnep_net_xmit(struct sk_buff skb, struct net_device dev)
	169	{
524ad0a7	170	struct bnep_session *s = netdev_priv(dev);
1da177e4 LT	171	struct sock *sk = s->sock->sk;
	172
	173	BT_DBG("skb %p, dev %p", skb, dev);
	174
	175	#ifdef CONFIG_BT_BNEP_MC_FILTER
	176	if (bnep_net_mc_filter(skb, s)) {
	177	kfree_skb(skb);
6ed10654	178	return NETDEV_TX_OK;
1da177e4 LT	179	}
1da177e4 LT	180	#endif
8e87d142	181
1da177e4 LT	182	#ifdef CONFIG_BT_BNEP_PROTO_FILTER
	183	if (bnep_net_proto_filter(skb, s)) {
	184	kfree_skb(skb);
6ed10654	185	return NETDEV_TX_OK;
1da177e4 LT	186	}
1da177e4 LT	187	#endif
8e87d142	188
1da177e4 LT	189	/*
	190	* We cannot send L2CAP packets from here as we are potentially in a bh.
	191	* So we have to queue them and wake up session thread which is sleeping
	192	* on the sk->sk_sleep.
	193	*/
	194	dev->trans_start = jiffies;
	195	skb_queue_tail(&sk->sk_write_queue, skb);
	196	wake_up_interruptible(sk->sk_sleep);
	197
	198	if (skb_queue_len(&sk->sk_write_queue) >= BNEP_TX_QUEUE_LEN) {
	199	BT_DBG("tx queue is full");
	200
	201	/* Stop queuing.
	202	* Session thread will do netif_wake_queue() */
	203	netif_stop_queue(dev);
	204	}
	205
6ed10654	206	return NETDEV_TX_OK;
1da177e4 LT	207	}
1da177e4 LT	208
b4d7f0a4 SH	209	static const struct net_device_ops bnep_netdev_ops = {
	210	.ndo_open = bnep_net_open,
	211	.ndo_stop = bnep_net_close,
	212	.ndo_start_xmit = bnep_net_xmit,
	213	.ndo_validate_addr = eth_validate_addr,
	214	.ndo_set_multicast_list = bnep_net_set_mc_list,
	215	.ndo_set_mac_address = bnep_net_set_mac_addr,
	216	.ndo_tx_timeout = bnep_net_timeout,
	217	.ndo_change_mtu = eth_change_mtu,
	218
	219	};
	220
1da177e4 LT	221	void bnep_net_setup(struct net_device *dev)
	222	{
	223
	224	memset(dev->broadcast, 0xff, ETH_ALEN);
	225	dev->addr_len = ETH_ALEN;
	226
	227	ether_setup(dev);
b4d7f0a4	228	dev->netdev_ops = &bnep_netdev_ops;
1da177e4 LT	229
1da177e4 LT	230	dev->watchdog_timeo = HZ * 2;
1da177e4	231	}