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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/etherdevice.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070029
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
Linus Torvalds1da177e2005-04-16 15:20:36 -070036#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
Linus Torvalds1da177e2005-04-16 15:20:36 -070050static void bnep_net_set_mc_list(struct net_device *dev)
51{
52#ifdef CONFIG_BT_BNEP_MC_FILTER
Wang Chen524ad0a2008-11-12 23:39:10 -080053 struct bnep_session *s = netdev_priv(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -070054 struct sock *sk = s->sock->sk;
55 struct bnep_set_filter_req *r;
56 struct sk_buff *skb;
57 int size;
58
Jiri Pirko4cd24ea2010-02-08 04:30:35 +000059 BT_DBG("%s mc_count %d", dev->name, netdev_mc_count(dev));
Linus Torvalds1da177e2005-04-16 15:20:36 -070060
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
YOSHIFUJI Hideaki8e87d142007-02-09 23:24:33 +090074 if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070075 u8 start[ETH_ALEN] = { 0x01 };
76
77 /* Request all addresses */
78 memcpy(__skb_put(skb, ETH_ALEN), start, ETH_ALEN);
79 memcpy(__skb_put(skb, ETH_ALEN), dev->broadcast, ETH_ALEN);
80 r->len = htons(ETH_ALEN * 2);
81 } else {
Jiri Pirko22bedad32010-04-01 21:22:57 +000082 struct netdev_hw_addr *ha;
Linus Torvalds1da177e2005-04-16 15:20:36 -070083 int i, len = skb->len;
84
85 if (dev->flags & IFF_BROADCAST) {
86 memcpy(__skb_put(skb, ETH_ALEN), dev->broadcast, ETH_ALEN);
87 memcpy(__skb_put(skb, ETH_ALEN), dev->broadcast, ETH_ALEN);
YOSHIFUJI Hideaki8e87d142007-02-09 23:24:33 +090088 }
89
Linus Torvalds1da177e2005-04-16 15:20:36 -070090 /* FIXME: We should group addresses here. */
91
Jiri Pirkoff6e2162010-03-01 05:09:14 +000092 i = 0;
Jiri Pirko22bedad32010-04-01 21:22:57 +000093 netdev_for_each_mc_addr(ha, dev) {
Jiri Pirkoff6e2162010-03-01 05:09:14 +000094 if (i == BNEP_MAX_MULTICAST_FILTERS)
95 break;
Jiri Pirko22bedad32010-04-01 21:22:57 +000096 memcpy(__skb_put(skb, ETH_ALEN), ha->addr, ETH_ALEN);
97 memcpy(__skb_put(skb, ETH_ALEN), ha->addr, ETH_ALEN);
Gustavo F. Padovan1a61a832010-06-18 14:24:00 +000098
99 i++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100 }
101 r->len = htons(skb->len - len);
102 }
103
104 skb_queue_tail(&sk->sk_write_queue, skb);
Eric Dumazetaa395142010-04-20 13:03:51 +0000105 wake_up_interruptible(sk_sleep(sk));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106#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)
116{
117 BT_DBG("net_timeout");
118 netif_wake_queue(dev);
119}
120
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121#ifdef CONFIG_BT_BNEP_MC_FILTER
Gustavo Padovan6039aa732012-05-23 04:04:18 -0300122static int bnep_net_mc_filter(struct sk_buff *skb, struct bnep_session *s)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123{
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. */
Gustavo Padovan6039aa732012-05-23 04:04:18 -0300134static u16 bnep_net_eth_proto(struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135{
136 struct ethhdr *eh = (void *) skb->data;
Al Viroe41d2162006-11-08 00:27:36 -0800137 u16 proto = ntohs(eh->h_proto);
YOSHIFUJI Hideaki8e87d142007-02-09 23:24:33 +0900138
Simon Hormane5c5d222013-03-28 13:38:25 +0900139 if (proto >= ETH_P_802_3_MIN)
Al Viroe41d2162006-11-08 00:27:36 -0800140 return proto;
YOSHIFUJI Hideaki8e87d142007-02-09 23:24:33 +0900141
Al Viroe41d2162006-11-08 00:27:36 -0800142 if (get_unaligned((__be16 *) skb->data) == htons(0xFFFF))
143 return ETH_P_802_3;
YOSHIFUJI Hideaki8e87d142007-02-09 23:24:33 +0900144
Al Viroe41d2162006-11-08 00:27:36 -0800145 return ETH_P_802_2;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146}
147
Gustavo Padovan6039aa732012-05-23 04:04:18 -0300148static int bnep_net_proto_filter(struct sk_buff *skb, struct bnep_session *s)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149{
150 u16 proto = bnep_net_eth_proto(skb);
151 struct bnep_proto_filter *f = s->proto_filter;
152 int i;
YOSHIFUJI Hideaki8e87d142007-02-09 23:24:33 +0900153
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154 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
Stephen Hemminger6fef4c02009-08-31 19:50:41 +0000164static netdev_tx_t bnep_net_xmit(struct sk_buff *skb,
165 struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166{
Wang Chen524ad0a2008-11-12 23:39:10 -0800167 struct bnep_session *s = netdev_priv(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168 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);
Patrick McHardy6ed10652009-06-23 06:03:08 +0000175 return NETDEV_TX_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176 }
177#endif
YOSHIFUJI Hideaki8e87d142007-02-09 23:24:33 +0900178
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179#ifdef CONFIG_BT_BNEP_PROTO_FILTER
180 if (bnep_net_proto_filter(skb, s)) {
181 kfree_skb(skb);
Patrick McHardy6ed10652009-06-23 06:03:08 +0000182 return NETDEV_TX_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183 }
184#endif
YOSHIFUJI Hideaki8e87d142007-02-09 23:24:33 +0900185
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186 /*
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
Eric Dumazetaa395142010-04-20 13:03:51 +0000189 * on the sk_sleep(sk).
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190 */
Florian Westphal860e9532016-05-03 16:33:13 +0200191 netif_trans_update(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192 skb_queue_tail(&sk->sk_write_queue, skb);
Eric Dumazetaa395142010-04-20 13:03:51 +0000193 wake_up_interruptible(sk_sleep(sk));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194
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
Patrick McHardy6ed10652009-06-23 06:03:08 +0000203 return NETDEV_TX_OK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204}
205
Stephen Hemmingerb4d7f0a2009-01-07 17:23:17 -0800206static 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,
Jiri Pirkoafc4b132011-08-16 06:29:01 +0000211 .ndo_set_rx_mode = bnep_net_set_mc_list,
Stephen Hemmingerb4d7f0a2009-01-07 17:23:17 -0800212 .ndo_set_mac_address = bnep_net_set_mac_addr,
213 .ndo_tx_timeout = bnep_net_timeout,
214 .ndo_change_mtu = eth_change_mtu,
215
216};
217
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218void bnep_net_setup(struct net_device *dev)
219{
220
Joe Perches211b8532015-03-02 19:54:55 -0800221 eth_broadcast_addr(dev->broadcast);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222 dev->addr_len = ETH_ALEN;
223
224 ether_setup(dev);
Neil Horman550fd082011-07-26 06:05:38 +0000225 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
Stephen Hemmingerb4d7f0a2009-01-07 17:23:17 -0800226 dev->netdev_ops = &bnep_netdev_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227
228 dev->watchdog_timeo = HZ * 2;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229}