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netdev.c
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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  ClĂ©ment Moreau <[email protected]>
6  David Libault <[email protected]>
7 
8  Copyright (C) 2002 Maxim Krasnyansky <[email protected]>
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/export.h>
29 #include <linux/etherdevice.h>
30 
32 #include <net/bluetooth/hci_core.h>
33 #include <net/bluetooth/l2cap.h>
34 
35 #include "bnep.h"
36 
37 #define BNEP_TX_QUEUE_LEN 20
38 
39 static int bnep_net_open(struct net_device *dev)
40 {
41  netif_start_queue(dev);
42  return 0;
43 }
44 
45 static int bnep_net_close(struct net_device *dev)
46 {
47  netif_stop_queue(dev);
48  return 0;
49 }
50 
51 static void bnep_net_set_mc_list(struct net_device *dev)
52 {
53 #ifdef CONFIG_BT_BNEP_MC_FILTER
54  struct bnep_session *s = netdev_priv(dev);
55  struct sock *sk = s->sock->sk;
56  struct bnep_set_filter_req *r;
57  struct sk_buff *skb;
58  int size;
59 
60  BT_DBG("%s mc_count %d", dev->name, netdev_mc_count(dev));
61 
62  size = sizeof(*r) + (BNEP_MAX_MULTICAST_FILTERS + 1) * ETH_ALEN * 2;
63  skb = alloc_skb(size, GFP_ATOMIC);
64  if (!skb) {
65  BT_ERR("%s Multicast list allocation failed", dev->name);
66  return;
67  }
68 
69  r = (void *) skb->data;
70  __skb_put(skb, sizeof(*r));
71 
72  r->type = BNEP_CONTROL;
74 
75  if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
76  u8 start[ETH_ALEN] = { 0x01 };
77 
78  /* Request all addresses */
79  memcpy(__skb_put(skb, ETH_ALEN), start, ETH_ALEN);
80  memcpy(__skb_put(skb, ETH_ALEN), dev->broadcast, ETH_ALEN);
81  r->len = htons(ETH_ALEN * 2);
82  } else {
83  struct netdev_hw_addr *ha;
84  int i, len = skb->len;
85 
86  if (dev->flags & IFF_BROADCAST) {
87  memcpy(__skb_put(skb, ETH_ALEN), dev->broadcast, ETH_ALEN);
88  memcpy(__skb_put(skb, ETH_ALEN), dev->broadcast, ETH_ALEN);
89  }
90 
91  /* FIXME: We should group addresses here. */
92 
93  i = 0;
94  netdev_for_each_mc_addr(ha, dev) {
96  break;
97  memcpy(__skb_put(skb, ETH_ALEN), ha->addr, ETH_ALEN);
98  memcpy(__skb_put(skb, ETH_ALEN), ha->addr, ETH_ALEN);
99 
100  i++;
101  }
102  r->len = htons(skb->len - len);
103  }
104 
105  skb_queue_tail(&sk->sk_write_queue, skb);
106  wake_up_interruptible(sk_sleep(sk));
107 #endif
108 }
109 
110 static int bnep_net_set_mac_addr(struct net_device *dev, void *arg)
111 {
112  BT_DBG("%s", dev->name);
113  return 0;
114 }
115 
116 static void bnep_net_timeout(struct net_device *dev)
117 {
118  BT_DBG("net_timeout");
119  netif_wake_queue(dev);
120 }
121 
122 #ifdef CONFIG_BT_BNEP_MC_FILTER
123 static int bnep_net_mc_filter(struct sk_buff *skb, struct bnep_session *s)
124 {
125  struct ethhdr *eh = (void *) skb->data;
126 
127  if ((eh->h_dest[0] & 1) && !test_bit(bnep_mc_hash(eh->h_dest), (ulong *) &s->mc_filter))
128  return 1;
129  return 0;
130 }
131 #endif
132 
133 #ifdef CONFIG_BT_BNEP_PROTO_FILTER
134 /* Determine ether protocol. Based on eth_type_trans. */
135 static u16 bnep_net_eth_proto(struct sk_buff *skb)
136 {
137  struct ethhdr *eh = (void *) skb->data;
138  u16 proto = ntohs(eh->h_proto);
139 
140  if (proto >= 1536)
141  return proto;
142 
143  if (get_unaligned((__be16 *) skb->data) == htons(0xFFFF))
144  return ETH_P_802_3;
145 
146  return ETH_P_802_2;
147 }
148 
149 static int bnep_net_proto_filter(struct sk_buff *skb, struct bnep_session *s)
150 {
151  u16 proto = bnep_net_eth_proto(skb);
152  struct bnep_proto_filter *f = s->proto_filter;
153  int i;
154 
155  for (i = 0; i < BNEP_MAX_PROTO_FILTERS && f[i].end; i++) {
156  if (proto >= f[i].start && proto <= f[i].end)
157  return 0;
158  }
159 
160  BT_DBG("BNEP: filtered skb %p, proto 0x%.4x", skb, proto);
161  return 1;
162 }
163 #endif
164 
165 static netdev_tx_t bnep_net_xmit(struct sk_buff *skb,
166  struct net_device *dev)
167 {
168  struct bnep_session *s = netdev_priv(dev);
169  struct sock *sk = s->sock->sk;
170 
171  BT_DBG("skb %p, dev %p", skb, dev);
172 
173 #ifdef CONFIG_BT_BNEP_MC_FILTER
174  if (bnep_net_mc_filter(skb, s)) {
175  kfree_skb(skb);
176  return NETDEV_TX_OK;
177  }
178 #endif
179 
180 #ifdef CONFIG_BT_BNEP_PROTO_FILTER
181  if (bnep_net_proto_filter(skb, s)) {
182  kfree_skb(skb);
183  return NETDEV_TX_OK;
184  }
185 #endif
186 
187  /*
188  * We cannot send L2CAP packets from here as we are potentially in a bh.
189  * So we have to queue them and wake up session thread which is sleeping
190  * on the sk_sleep(sk).
191  */
192  dev->trans_start = jiffies;
193  skb_queue_tail(&sk->sk_write_queue, skb);
194  wake_up_interruptible(sk_sleep(sk));
195 
196  if (skb_queue_len(&sk->sk_write_queue) >= BNEP_TX_QUEUE_LEN) {
197  BT_DBG("tx queue is full");
198 
199  /* Stop queuing.
200  * Session thread will do netif_wake_queue() */
201  netif_stop_queue(dev);
202  }
203 
204  return NETDEV_TX_OK;
205 }
206 
207 static const struct net_device_ops bnep_netdev_ops = {
208  .ndo_open = bnep_net_open,
209  .ndo_stop = bnep_net_close,
210  .ndo_start_xmit = bnep_net_xmit,
211  .ndo_validate_addr = eth_validate_addr,
212  .ndo_set_rx_mode = bnep_net_set_mc_list,
213  .ndo_set_mac_address = bnep_net_set_mac_addr,
214  .ndo_tx_timeout = bnep_net_timeout,
215  .ndo_change_mtu = eth_change_mtu,
216 
217 };
218 
219 void bnep_net_setup(struct net_device *dev)
220 {
221 
222  memset(dev->broadcast, 0xff, ETH_ALEN);
223  dev->addr_len = ETH_ALEN;
224 
225  ether_setup(dev);
227  dev->netdev_ops = &bnep_netdev_ops;
228 
229  dev->watchdog_timeo = HZ * 2;
230 }