[deliverable/linux.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"

#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
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
	44	#ifndef CONFIG_BT_BNEP_DEBUG
	45	#undef BT_DBG
	46	#define BT_DBG( A... )
	47	#endif
	48
	49	#define BNEP_TX_QUEUE_LEN 20
	50
	51	static int bnep_net_open(struct net_device *dev)
	52	{
	53	netif_start_queue(dev);
	54	return 0;
	55	}
	56
	57	static int bnep_net_close(struct net_device *dev)
	58	{
	59	netif_stop_queue(dev);
	60	return 0;
	61	}
	62
	63	static struct net_device_stats bnep_net_get_stats(struct net_device dev)
	64	{
	65	struct bnep_session *s = dev->priv;
	66	return &s->stats;
	67	}
	68
	69	static void bnep_net_set_mc_list(struct net_device *dev)
	70	{
	71	#ifdef CONFIG_BT_BNEP_MC_FILTER
	72	struct bnep_session *s = dev->priv;
	73	struct sock *sk = s->sock->sk;
	74	struct bnep_set_filter_req *r;
	75	struct sk_buff *skb;
	76	int size;
	77
	78	BT_DBG("%s mc_count %d", dev->name, dev->mc_count);
	79
	80	size = sizeof(r) + (BNEP_MAX_MULTICAST_FILTERS + 1) ETH_ALEN * 2;
	81	skb = alloc_skb(size, GFP_ATOMIC);
	82	if (!skb) {
	83	BT_ERR("%s Multicast list allocation failed", dev->name);
	84	return;
	85	}
	86
	87	r = (void *) skb->data;
	88	__skb_put(skb, sizeof(*r));
	89
	90	r->type = BNEP_CONTROL;
	91	r->ctrl = BNEP_FILTER_MULTI_ADDR_SET;
92
8e87d142	93	if (dev->flags & (IFF_PROMISC \| IFF_ALLMULTI)) {
1da177e4 LT	94	u8 start[ETH_ALEN] = { 0x01 };
	95
	96	/* Request all addresses */
	97	memcpy(__skb_put(skb, ETH_ALEN), start, ETH_ALEN);
	98	memcpy(__skb_put(skb, ETH_ALEN), dev->broadcast, ETH_ALEN);
	99	r->len = htons(ETH_ALEN * 2);
	100	} else {
8e87d142	101	struct dev_mc_list *dmi = dev->mc_list;
1da177e4 LT	102	int i, len = skb->len;
	103
	104	if (dev->flags & IFF_BROADCAST) {
	105	memcpy(__skb_put(skb, ETH_ALEN), dev->broadcast, ETH_ALEN);
	106	memcpy(__skb_put(skb, ETH_ALEN), dev->broadcast, ETH_ALEN);
8e87d142 YH	107	}
8e87d142 YH	108
1da177e4 LT	109	/* FIXME: We should group addresses here. */
	110
	111	for (i = 0; i < dev->mc_count && i < BNEP_MAX_MULTICAST_FILTERS; i++) {
	112	memcpy(__skb_put(skb, ETH_ALEN), dmi->dmi_addr, ETH_ALEN);
	113	memcpy(__skb_put(skb, ETH_ALEN), dmi->dmi_addr, ETH_ALEN);
	114	dmi = dmi->next;
	115	}
	116	r->len = htons(skb->len - len);
	117	}
	118
	119	skb_queue_tail(&sk->sk_write_queue, skb);
	120	wake_up_interruptible(sk->sk_sleep);
	121	#endif
	122	}
	123
	124	static int bnep_net_set_mac_addr(struct net_device dev, void arg)
	125	{
	126	BT_DBG("%s", dev->name);
	127	return 0;
	128	}
	129
	130	static void bnep_net_timeout(struct net_device *dev)
	131	{
	132	BT_DBG("net_timeout");
	133	netif_wake_queue(dev);
	134	}
	135
	136	static int bnep_net_ioctl(struct net_device dev, struct ifreq ifr, int cmd)
	137	{
	138	return -EINVAL;
	139	}
	140
	141	#ifdef CONFIG_BT_BNEP_MC_FILTER
	142	static inline int bnep_net_mc_filter(struct sk_buff skb, struct bnep_session s)
	143	{
	144	struct ethhdr eh = (void ) skb->data;
	145
	146	if ((eh->h_dest[0] & 1) && !test_bit(bnep_mc_hash(eh->h_dest), (ulong *) &s->mc_filter))
	147	return 1;
	148	return 0;
	149	}
	150	#endif
	151
	152	#ifdef CONFIG_BT_BNEP_PROTO_FILTER
	153	/* Determine ether protocol. Based on eth_type_trans. */
	154	static inline u16 bnep_net_eth_proto(struct sk_buff *skb)
	155	{
	156	struct ethhdr eh = (void ) skb->data;
e41d2169	157	u16 proto = ntohs(eh->h_proto);
8e87d142	158
e41d2169 AV	159	if (proto >= 1536)
e41d2169 AV	160	return proto;
8e87d142	161
e41d2169 AV	162	if (get_unaligned((__be16 *) skb->data) == htons(0xFFFF))
e41d2169 AV	163	return ETH_P_802_3;
8e87d142	164
e41d2169	165	return ETH_P_802_2;
1da177e4 LT	166	}
	167
	168	static inline int bnep_net_proto_filter(struct sk_buff skb, struct bnep_session s)
	169	{
	170	u16 proto = bnep_net_eth_proto(skb);
	171	struct bnep_proto_filter *f = s->proto_filter;
	172	int i;
8e87d142	173
1da177e4 LT	174	for (i = 0; i < BNEP_MAX_PROTO_FILTERS && f[i].end; i++) {
	175	if (proto >= f[i].start && proto <= f[i].end)
	176	return 0;
	177	}
	178
	179	BT_DBG("BNEP: filtered skb %p, proto 0x%.4x", skb, proto);
	180	return 1;
	181	}
	182	#endif
	183
	184	static int bnep_net_xmit(struct sk_buff skb, struct net_device dev)
	185	{
	186	struct bnep_session *s = dev->priv;
	187	struct sock *sk = s->sock->sk;
	188
	189	BT_DBG("skb %p, dev %p", skb, dev);
	190
	191	#ifdef CONFIG_BT_BNEP_MC_FILTER
	192	if (bnep_net_mc_filter(skb, s)) {
	193	kfree_skb(skb);
	194	return 0;
	195	}
	196	#endif
8e87d142	197
1da177e4 LT	198	#ifdef CONFIG_BT_BNEP_PROTO_FILTER
	199	if (bnep_net_proto_filter(skb, s)) {
	200	kfree_skb(skb);
	201	return 0;
	202	}
	203	#endif
8e87d142	204
1da177e4 LT	205	/*
	206	* We cannot send L2CAP packets from here as we are potentially in a bh.
	207	* So we have to queue them and wake up session thread which is sleeping
	208	* on the sk->sk_sleep.
	209	*/
	210	dev->trans_start = jiffies;
	211	skb_queue_tail(&sk->sk_write_queue, skb);
	212	wake_up_interruptible(sk->sk_sleep);
	213
	214	if (skb_queue_len(&sk->sk_write_queue) >= BNEP_TX_QUEUE_LEN) {
	215	BT_DBG("tx queue is full");
	216
	217	/* Stop queuing.
	218	* Session thread will do netif_wake_queue() */
	219	netif_stop_queue(dev);
	220	}
	221
	222	return 0;
	223	}
	224
	225	void bnep_net_setup(struct net_device *dev)
	226	{
	227
	228	memset(dev->broadcast, 0xff, ETH_ALEN);
	229	dev->addr_len = ETH_ALEN;
	230
	231	ether_setup(dev);
	232
	233	dev->open = bnep_net_open;
	234	dev->stop = bnep_net_close;
	235	dev->hard_start_xmit = bnep_net_xmit;
	236	dev->get_stats = bnep_net_get_stats;
	237	dev->do_ioctl = bnep_net_ioctl;
	238	dev->set_mac_address = bnep_net_set_mac_addr;
	239	dev->set_multicast_list = bnep_net_set_mc_list;
	240
	241	dev->watchdog_timeo = HZ * 2;
	242	dev->tx_timeout = bnep_net_timeout;
	243	}