1 /*
2 BNEP implementation for Linux Bluetooth stack (BlueZ).
3 Copyright (C) 2001-2002 Inventel Systemes
4 Written 2001-2002 by
5 Clément Moreau <clement.moreau@inventel.fr>
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
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
21 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
22
23 ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
24 COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
25 SOFTWARE IS DISCLAIMED.
26 */
27
28 #include <linux/etherdevice.h>
29
30 #include <net/bluetooth/bluetooth.h>
31 #include <net/bluetooth/hci_core.h>
32 #include <net/bluetooth/l2cap.h>
33
34 #include "bnep.h"
35
36 #define BNEP_TX_QUEUE_LEN 20
37
bnep_net_open(struct net_device * dev)38 static int bnep_net_open(struct net_device *dev)
39 {
40 netif_start_queue(dev);
41 return 0;
42 }
43
bnep_net_close(struct net_device * dev)44 static int bnep_net_close(struct net_device *dev)
45 {
46 netif_stop_queue(dev);
47 return 0;
48 }
49
bnep_net_set_mc_list(struct net_device * dev)50 static void bnep_net_set_mc_list(struct net_device *dev)
51 {
52 #ifdef CONFIG_BT_BNEP_MC_FILTER
53 struct bnep_session *s = netdev_priv(dev);
54 struct sock *sk = s->sock->sk;
55 struct bnep_set_filter_req *r;
56 struct sk_buff *skb;
57 int size;
58
59 BT_DBG("%s mc_count %d", dev->name, netdev_mc_count(dev));
60
61 size = sizeof(*r) + (BNEP_MAX_MULTICAST_FILTERS + 1) * ETH_ALEN * 2;
62 skb = alloc_skb(size, GFP_ATOMIC);
63 if (!skb) {
64 BT_ERR("%s Multicast list allocation failed", dev->name);
65 return;
66 }
67
68 r = (void *) skb->data;
69 __skb_put(skb, sizeof(*r));
70
71 r->type = BNEP_CONTROL;
72 r->ctrl = BNEP_FILTER_MULTI_ADDR_SET;
73
74 if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
75 u8 start[ETH_ALEN] = { 0x01 };
76
77 /* Request all addresses */
78 __skb_put_data(skb, start, ETH_ALEN);
79 __skb_put_data(skb, dev->broadcast, ETH_ALEN);
80 r->len = htons(ETH_ALEN * 2);
81 } else {
82 struct netdev_hw_addr *ha;
83 int i, len = skb->len;
84
85 if (dev->flags & IFF_BROADCAST) {
86 __skb_put_data(skb, dev->broadcast, ETH_ALEN);
87 __skb_put_data(skb, dev->broadcast, ETH_ALEN);
88 }
89
90 /* FIXME: We should group addresses here. */
91
92 i = 0;
93 netdev_for_each_mc_addr(ha, dev) {
94 if (i == BNEP_MAX_MULTICAST_FILTERS)
95 break;
96 __skb_put_data(skb, ha->addr, ETH_ALEN);
97 __skb_put_data(skb, ha->addr, ETH_ALEN);
98
99 i++;
100 }
101 r->len = htons(skb->len - len);
102 }
103
104 skb_queue_tail(&sk->sk_write_queue, skb);
105 wake_up_interruptible(sk_sleep(sk));
106 #endif
107 }
108
bnep_net_set_mac_addr(struct net_device * dev,void * arg)109 static int bnep_net_set_mac_addr(struct net_device *dev, void *arg)
110 {
111 BT_DBG("%s", dev->name);
112 return 0;
113 }
114
bnep_net_timeout(struct net_device * dev,unsigned int txqueue)115 static void bnep_net_timeout(struct net_device *dev, unsigned int txqueue)
116 {
117 BT_DBG("net_timeout");
118 netif_wake_queue(dev);
119 }
120
121 #ifdef CONFIG_BT_BNEP_MC_FILTER
bnep_net_mc_filter(struct sk_buff * skb,struct bnep_session * s)122 static int bnep_net_mc_filter(struct sk_buff *skb, struct bnep_session *s)
123 {
124 struct ethhdr *eh = (void *) skb->data;
125
126 if ((eh->h_dest[0] & 1) && !test_bit(bnep_mc_hash(eh->h_dest), (ulong *) &s->mc_filter))
127 return 1;
128 return 0;
129 }
130 #endif
131
132 #ifdef CONFIG_BT_BNEP_PROTO_FILTER
133 /* Determine ether protocol. Based on eth_type_trans. */
bnep_net_eth_proto(struct sk_buff * skb)134 static u16 bnep_net_eth_proto(struct sk_buff *skb)
135 {
136 struct ethhdr *eh = (void *) skb->data;
137 u16 proto = ntohs(eh->h_proto);
138
139 if (proto >= ETH_P_802_3_MIN)
140 return proto;
141
142 if (get_unaligned((__be16 *) skb->data) == htons(0xFFFF))
143 return ETH_P_802_3;
144
145 return ETH_P_802_2;
146 }
147
bnep_net_proto_filter(struct sk_buff * skb,struct bnep_session * s)148 static int bnep_net_proto_filter(struct sk_buff *skb, struct bnep_session *s)
149 {
150 u16 proto = bnep_net_eth_proto(skb);
151 struct bnep_proto_filter *f = s->proto_filter;
152 int i;
153
154 for (i = 0; i < BNEP_MAX_PROTO_FILTERS && f[i].end; i++) {
155 if (proto >= f[i].start && proto <= f[i].end)
156 return 0;
157 }
158
159 BT_DBG("BNEP: filtered skb %p, proto 0x%.4x", skb, proto);
160 return 1;
161 }
162 #endif
163
bnep_net_xmit(struct sk_buff * skb,struct net_device * dev)164 static netdev_tx_t bnep_net_xmit(struct sk_buff *skb,
165 struct net_device *dev)
166 {
167 struct bnep_session *s = netdev_priv(dev);
168 struct sock *sk = s->sock->sk;
169
170 BT_DBG("skb %p, dev %p", skb, dev);
171
172 #ifdef CONFIG_BT_BNEP_MC_FILTER
173 if (bnep_net_mc_filter(skb, s)) {
174 kfree_skb(skb);
175 return NETDEV_TX_OK;
176 }
177 #endif
178
179 #ifdef CONFIG_BT_BNEP_PROTO_FILTER
180 if (bnep_net_proto_filter(skb, s)) {
181 kfree_skb(skb);
182 return NETDEV_TX_OK;
183 }
184 #endif
185
186 /*
187 * We cannot send L2CAP packets from here as we are potentially in a bh.
188 * So we have to queue them and wake up session thread which is sleeping
189 * on the sk_sleep(sk).
190 */
191 netif_trans_update(dev);
192 skb_queue_tail(&sk->sk_write_queue, skb);
193 wake_up_interruptible(sk_sleep(sk));
194
195 if (skb_queue_len(&sk->sk_write_queue) >= BNEP_TX_QUEUE_LEN) {
196 BT_DBG("tx queue is full");
197
198 /* Stop queuing.
199 * Session thread will do netif_wake_queue() */
200 netif_stop_queue(dev);
201 }
202
203 return NETDEV_TX_OK;
204 }
205
206 static const struct net_device_ops bnep_netdev_ops = {
207 .ndo_open = bnep_net_open,
208 .ndo_stop = bnep_net_close,
209 .ndo_start_xmit = bnep_net_xmit,
210 .ndo_validate_addr = eth_validate_addr,
211 .ndo_set_rx_mode = bnep_net_set_mc_list,
212 .ndo_set_mac_address = bnep_net_set_mac_addr,
213 .ndo_tx_timeout = bnep_net_timeout,
214
215 };
216
bnep_net_setup(struct net_device * dev)217 void bnep_net_setup(struct net_device *dev)
218 {
219
220 eth_broadcast_addr(dev->broadcast);
221 dev->addr_len = ETH_ALEN;
222
223 ether_setup(dev);
224 dev->min_mtu = 0;
225 dev->max_mtu = ETH_MAX_MTU;
226 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
227 dev->netdev_ops = &bnep_netdev_ops;
228
229 dev->watchdog_timeo = HZ * 2;
230 }
231