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YOSHIFUJI Hideaki8e87d142007-02-09 23:24:33 +09001/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07002 BNEP implementation for Linux Bluetooth stack (BlueZ).
3 Copyright (C) 2001-2002 Inventel Systemes
4 Written 2001-2002 by
Jan Engelhardt96de0e22007-10-19 23:21:04 +02005 Clément Moreau <clement.moreau@inventel.fr>
Linus Torvalds1da177e2005-04-16 15:20:36 -07006 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
YOSHIFUJI Hideaki8e87d142007-02-09 23:24:33 +090018 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
Linus Torvalds1da177e2005-04-16 15:20:36 -070021 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
22
YOSHIFUJI Hideaki8e87d142007-02-09 23:24:33 +090023 ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
24 COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
Linus Torvalds1da177e2005-04-16 15:20:36 -070025 SOFTWARE IS DISCLAIMED.
26*/
27
Linus Torvalds1da177e2005-04-16 15:20:36 -070028#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
51static int bnep_net_open(struct net_device *dev)
52{
53 netif_start_queue(dev);
54 return 0;
55}
56
57static int bnep_net_close(struct net_device *dev)
58{
59 netif_stop_queue(dev);
60 return 0;
61}
62
63static 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
69static 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
YOSHIFUJI Hideaki8e87d142007-02-09 23:24:33 +090093 if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070094 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 {
YOSHIFUJI Hideaki8e87d142007-02-09 23:24:33 +0900101 struct dev_mc_list *dmi = dev->mc_list;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102 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);
YOSHIFUJI Hideaki8e87d142007-02-09 23:24:33 +0900107 }
108
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109 /* 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
124static int bnep_net_set_mac_addr(struct net_device *dev, void *arg)
125{
126 BT_DBG("%s", dev->name);
127 return 0;
128}
129
130static void bnep_net_timeout(struct net_device *dev)
131{
132 BT_DBG("net_timeout");
133 netif_wake_queue(dev);
134}
135
136static 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
142static 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. */
154static inline u16 bnep_net_eth_proto(struct sk_buff *skb)
155{
156 struct ethhdr *eh = (void *) skb->data;
Al Viroe41d2162006-11-08 00:27:36 -0800157 u16 proto = ntohs(eh->h_proto);
YOSHIFUJI Hideaki8e87d142007-02-09 23:24:33 +0900158
Al Viroe41d2162006-11-08 00:27:36 -0800159 if (proto >= 1536)
160 return proto;
YOSHIFUJI Hideaki8e87d142007-02-09 23:24:33 +0900161
Al Viroe41d2162006-11-08 00:27:36 -0800162 if (get_unaligned((__be16 *) skb->data) == htons(0xFFFF))
163 return ETH_P_802_3;
YOSHIFUJI Hideaki8e87d142007-02-09 23:24:33 +0900164
Al Viroe41d2162006-11-08 00:27:36 -0800165 return ETH_P_802_2;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166}
167
168static 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;
YOSHIFUJI Hideaki8e87d142007-02-09 23:24:33 +0900173
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174 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
184static 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
YOSHIFUJI Hideaki8e87d142007-02-09 23:24:33 +0900197
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198#ifdef CONFIG_BT_BNEP_PROTO_FILTER
199 if (bnep_net_proto_filter(skb, s)) {
200 kfree_skb(skb);
201 return 0;
202 }
203#endif
YOSHIFUJI Hideaki8e87d142007-02-09 23:24:33 +0900204
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205 /*
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
225void 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}