xref: /linux/net/bluetooth/bnep/netdev.c (revision 8dd06ef34b6e2f41b29fbf5fc1663780f2524285)
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