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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
38static int bnep_net_open(struct net_device *dev)
39{
40 netif_start_queue(dev);
41 return 0;
42}
43
44static int bnep_net_close(struct net_device *dev)
45{
46 netif_stop_queue(dev);
47 return 0;
48}
49
50static 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
109static int bnep_net_set_mac_addr(struct net_device *dev, void *arg)
110{
111 BT_DBG("%s", dev->name);
112 return 0;
113}
114
115static 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
122static 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. */
134static 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
148static 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
164static 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
206static 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
217void 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}
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/module.h>
29#include <linux/slab.h>
30
31#include <linux/socket.h>
32#include <linux/netdevice.h>
33#include <linux/etherdevice.h>
34#include <linux/skbuff.h>
35#include <linux/wait.h>
36
37#include <asm/unaligned.h>
38
39#include <net/bluetooth/bluetooth.h>
40#include <net/bluetooth/hci_core.h>
41#include <net/bluetooth/l2cap.h>
42
43#include "bnep.h"
44
45#define BNEP_TX_QUEUE_LEN 20
46
47static int bnep_net_open(struct net_device *dev)
48{
49 netif_start_queue(dev);
50 return 0;
51}
52
53static int bnep_net_close(struct net_device *dev)
54{
55 netif_stop_queue(dev);
56 return 0;
57}
58
59static void bnep_net_set_mc_list(struct net_device *dev)
60{
61#ifdef CONFIG_BT_BNEP_MC_FILTER
62 struct bnep_session *s = netdev_priv(dev);
63 struct sock *sk = s->sock->sk;
64 struct bnep_set_filter_req *r;
65 struct sk_buff *skb;
66 int size;
67
68 BT_DBG("%s mc_count %d", dev->name, netdev_mc_count(dev));
69
70 size = sizeof(*r) + (BNEP_MAX_MULTICAST_FILTERS + 1) * ETH_ALEN * 2;
71 skb = alloc_skb(size, GFP_ATOMIC);
72 if (!skb) {
73 BT_ERR("%s Multicast list allocation failed", dev->name);
74 return;
75 }
76
77 r = (void *) skb->data;
78 __skb_put(skb, sizeof(*r));
79
80 r->type = BNEP_CONTROL;
81 r->ctrl = BNEP_FILTER_MULTI_ADDR_SET;
82
83 if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
84 u8 start[ETH_ALEN] = { 0x01 };
85
86 /* Request all addresses */
87 memcpy(__skb_put(skb, ETH_ALEN), start, ETH_ALEN);
88 memcpy(__skb_put(skb, ETH_ALEN), dev->broadcast, ETH_ALEN);
89 r->len = htons(ETH_ALEN * 2);
90 } else {
91 struct netdev_hw_addr *ha;
92 int i, len = skb->len;
93
94 if (dev->flags & IFF_BROADCAST) {
95 memcpy(__skb_put(skb, ETH_ALEN), dev->broadcast, ETH_ALEN);
96 memcpy(__skb_put(skb, ETH_ALEN), dev->broadcast, ETH_ALEN);
97 }
98
99 /* FIXME: We should group addresses here. */
100
101 i = 0;
102 netdev_for_each_mc_addr(ha, dev) {
103 if (i == BNEP_MAX_MULTICAST_FILTERS)
104 break;
105 memcpy(__skb_put(skb, ETH_ALEN), ha->addr, ETH_ALEN);
106 memcpy(__skb_put(skb, ETH_ALEN), ha->addr, ETH_ALEN);
107
108 i++;
109 }
110 r->len = htons(skb->len - len);
111 }
112
113 skb_queue_tail(&sk->sk_write_queue, skb);
114 wake_up_interruptible(sk_sleep(sk));
115#endif
116}
117
118static int bnep_net_set_mac_addr(struct net_device *dev, void *arg)
119{
120 BT_DBG("%s", dev->name);
121 return 0;
122}
123
124static void bnep_net_timeout(struct net_device *dev)
125{
126 BT_DBG("net_timeout");
127 netif_wake_queue(dev);
128}
129
130#ifdef CONFIG_BT_BNEP_MC_FILTER
131static inline int bnep_net_mc_filter(struct sk_buff *skb, struct bnep_session *s)
132{
133 struct ethhdr *eh = (void *) skb->data;
134
135 if ((eh->h_dest[0] & 1) && !test_bit(bnep_mc_hash(eh->h_dest), (ulong *) &s->mc_filter))
136 return 1;
137 return 0;
138}
139#endif
140
141#ifdef CONFIG_BT_BNEP_PROTO_FILTER
142/* Determine ether protocol. Based on eth_type_trans. */
143static inline u16 bnep_net_eth_proto(struct sk_buff *skb)
144{
145 struct ethhdr *eh = (void *) skb->data;
146 u16 proto = ntohs(eh->h_proto);
147
148 if (proto >= 1536)
149 return proto;
150
151 if (get_unaligned((__be16 *) skb->data) == htons(0xFFFF))
152 return ETH_P_802_3;
153
154 return ETH_P_802_2;
155}
156
157static inline int bnep_net_proto_filter(struct sk_buff *skb, struct bnep_session *s)
158{
159 u16 proto = bnep_net_eth_proto(skb);
160 struct bnep_proto_filter *f = s->proto_filter;
161 int i;
162
163 for (i = 0; i < BNEP_MAX_PROTO_FILTERS && f[i].end; i++) {
164 if (proto >= f[i].start && proto <= f[i].end)
165 return 0;
166 }
167
168 BT_DBG("BNEP: filtered skb %p, proto 0x%.4x", skb, proto);
169 return 1;
170}
171#endif
172
173static netdev_tx_t bnep_net_xmit(struct sk_buff *skb,
174 struct net_device *dev)
175{
176 struct bnep_session *s = netdev_priv(dev);
177 struct sock *sk = s->sock->sk;
178
179 BT_DBG("skb %p, dev %p", skb, dev);
180
181#ifdef CONFIG_BT_BNEP_MC_FILTER
182 if (bnep_net_mc_filter(skb, s)) {
183 kfree_skb(skb);
184 return NETDEV_TX_OK;
185 }
186#endif
187
188#ifdef CONFIG_BT_BNEP_PROTO_FILTER
189 if (bnep_net_proto_filter(skb, s)) {
190 kfree_skb(skb);
191 return NETDEV_TX_OK;
192 }
193#endif
194
195 /*
196 * We cannot send L2CAP packets from here as we are potentially in a bh.
197 * So we have to queue them and wake up session thread which is sleeping
198 * on the sk_sleep(sk).
199 */
200 dev->trans_start = jiffies;
201 skb_queue_tail(&sk->sk_write_queue, skb);
202 wake_up_interruptible(sk_sleep(sk));
203
204 if (skb_queue_len(&sk->sk_write_queue) >= BNEP_TX_QUEUE_LEN) {
205 BT_DBG("tx queue is full");
206
207 /* Stop queuing.
208 * Session thread will do netif_wake_queue() */
209 netif_stop_queue(dev);
210 }
211
212 return NETDEV_TX_OK;
213}
214
215static const struct net_device_ops bnep_netdev_ops = {
216 .ndo_open = bnep_net_open,
217 .ndo_stop = bnep_net_close,
218 .ndo_start_xmit = bnep_net_xmit,
219 .ndo_validate_addr = eth_validate_addr,
220 .ndo_set_multicast_list = bnep_net_set_mc_list,
221 .ndo_set_mac_address = bnep_net_set_mac_addr,
222 .ndo_tx_timeout = bnep_net_timeout,
223 .ndo_change_mtu = eth_change_mtu,
224
225};
226
227void bnep_net_setup(struct net_device *dev)
228{
229
230 memset(dev->broadcast, 0xff, ETH_ALEN);
231 dev->addr_len = ETH_ALEN;
232
233 ether_setup(dev);
234 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
235 dev->netdev_ops = &bnep_netdev_ops;
236
237 dev->watchdog_timeo = HZ * 2;
238}