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 /* 29 * $Id: netdev.c,v 1.8 2002/08/04 21:23:58 maxk Exp $ 30 */ 31 32 #include <linux/module.h> 33 34 #include <linux/socket.h> 35 #include <linux/netdevice.h> 36 #include <linux/etherdevice.h> 37 #include <linux/skbuff.h> 38 #include <linux/wait.h> 39 40 #include <asm/unaligned.h> 41 42 #include <net/bluetooth/bluetooth.h> 43 #include <net/bluetooth/hci_core.h> 44 #include <net/bluetooth/l2cap.h> 45 46 #include "bnep.h" 47 48 #ifndef CONFIG_BT_BNEP_DEBUG 49 #undef BT_DBG 50 #define BT_DBG( A... ) 51 #endif 52 53 #define BNEP_TX_QUEUE_LEN 20 54 55 static int bnep_net_open(struct net_device *dev) 56 { 57 netif_start_queue(dev); 58 return 0; 59 } 60 61 static int bnep_net_close(struct net_device *dev) 62 { 63 netif_stop_queue(dev); 64 return 0; 65 } 66 67 static struct net_device_stats *bnep_net_get_stats(struct net_device *dev) 68 { 69 struct bnep_session *s = dev->priv; 70 return &s->stats; 71 } 72 73 static void bnep_net_set_mc_list(struct net_device *dev) 74 { 75 #ifdef CONFIG_BT_BNEP_MC_FILTER 76 struct bnep_session *s = dev->priv; 77 struct sock *sk = s->sock->sk; 78 struct bnep_set_filter_req *r; 79 struct sk_buff *skb; 80 int size; 81 82 BT_DBG("%s mc_count %d", dev->name, dev->mc_count); 83 84 size = sizeof(*r) + (BNEP_MAX_MULTICAST_FILTERS + 1) * ETH_ALEN * 2; 85 skb = alloc_skb(size, GFP_ATOMIC); 86 if (!skb) { 87 BT_ERR("%s Multicast list allocation failed", dev->name); 88 return; 89 } 90 91 r = (void *) skb->data; 92 __skb_put(skb, sizeof(*r)); 93 94 r->type = BNEP_CONTROL; 95 r->ctrl = BNEP_FILTER_MULTI_ADDR_SET; 96 97 if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) { 98 u8 start[ETH_ALEN] = { 0x01 }; 99 100 /* Request all addresses */ 101 memcpy(__skb_put(skb, ETH_ALEN), start, ETH_ALEN); 102 memcpy(__skb_put(skb, ETH_ALEN), dev->broadcast, ETH_ALEN); 103 r->len = htons(ETH_ALEN * 2); 104 } else { 105 struct dev_mc_list *dmi = dev->mc_list; 106 int i, len = skb->len; 107 108 if (dev->flags & IFF_BROADCAST) { 109 memcpy(__skb_put(skb, ETH_ALEN), dev->broadcast, ETH_ALEN); 110 memcpy(__skb_put(skb, ETH_ALEN), dev->broadcast, ETH_ALEN); 111 } 112 113 /* FIXME: We should group addresses here. */ 114 115 for (i = 0; i < dev->mc_count && i < BNEP_MAX_MULTICAST_FILTERS; i++) { 116 memcpy(__skb_put(skb, ETH_ALEN), dmi->dmi_addr, ETH_ALEN); 117 memcpy(__skb_put(skb, ETH_ALEN), dmi->dmi_addr, ETH_ALEN); 118 dmi = dmi->next; 119 } 120 r->len = htons(skb->len - len); 121 } 122 123 skb_queue_tail(&sk->sk_write_queue, skb); 124 wake_up_interruptible(sk->sk_sleep); 125 #endif 126 } 127 128 static int bnep_net_set_mac_addr(struct net_device *dev, void *arg) 129 { 130 BT_DBG("%s", dev->name); 131 return 0; 132 } 133 134 static void bnep_net_timeout(struct net_device *dev) 135 { 136 BT_DBG("net_timeout"); 137 netif_wake_queue(dev); 138 } 139 140 static int bnep_net_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) 141 { 142 return -EINVAL; 143 } 144 145 #ifdef CONFIG_BT_BNEP_MC_FILTER 146 static inline int bnep_net_mc_filter(struct sk_buff *skb, struct bnep_session *s) 147 { 148 struct ethhdr *eh = (void *) skb->data; 149 150 if ((eh->h_dest[0] & 1) && !test_bit(bnep_mc_hash(eh->h_dest), (ulong *) &s->mc_filter)) 151 return 1; 152 return 0; 153 } 154 #endif 155 156 #ifdef CONFIG_BT_BNEP_PROTO_FILTER 157 /* Determine ether protocol. Based on eth_type_trans. */ 158 static inline u16 bnep_net_eth_proto(struct sk_buff *skb) 159 { 160 struct ethhdr *eh = (void *) skb->data; 161 u16 proto = ntohs(eh->h_proto); 162 163 if (proto >= 1536) 164 return proto; 165 166 if (get_unaligned((__be16 *) skb->data) == htons(0xFFFF)) 167 return ETH_P_802_3; 168 169 return ETH_P_802_2; 170 } 171 172 static inline int bnep_net_proto_filter(struct sk_buff *skb, struct bnep_session *s) 173 { 174 u16 proto = bnep_net_eth_proto(skb); 175 struct bnep_proto_filter *f = s->proto_filter; 176 int i; 177 178 for (i = 0; i < BNEP_MAX_PROTO_FILTERS && f[i].end; i++) { 179 if (proto >= f[i].start && proto <= f[i].end) 180 return 0; 181 } 182 183 BT_DBG("BNEP: filtered skb %p, proto 0x%.4x", skb, proto); 184 return 1; 185 } 186 #endif 187 188 static int bnep_net_xmit(struct sk_buff *skb, struct net_device *dev) 189 { 190 struct bnep_session *s = dev->priv; 191 struct sock *sk = s->sock->sk; 192 193 BT_DBG("skb %p, dev %p", skb, dev); 194 195 #ifdef CONFIG_BT_BNEP_MC_FILTER 196 if (bnep_net_mc_filter(skb, s)) { 197 kfree_skb(skb); 198 return 0; 199 } 200 #endif 201 202 #ifdef CONFIG_BT_BNEP_PROTO_FILTER 203 if (bnep_net_proto_filter(skb, s)) { 204 kfree_skb(skb); 205 return 0; 206 } 207 #endif 208 209 /* 210 * We cannot send L2CAP packets from here as we are potentially in a bh. 211 * So we have to queue them and wake up session thread which is sleeping 212 * on the sk->sk_sleep. 213 */ 214 dev->trans_start = jiffies; 215 skb_queue_tail(&sk->sk_write_queue, skb); 216 wake_up_interruptible(sk->sk_sleep); 217 218 if (skb_queue_len(&sk->sk_write_queue) >= BNEP_TX_QUEUE_LEN) { 219 BT_DBG("tx queue is full"); 220 221 /* Stop queuing. 222 * Session thread will do netif_wake_queue() */ 223 netif_stop_queue(dev); 224 } 225 226 return 0; 227 } 228 229 void bnep_net_setup(struct net_device *dev) 230 { 231 232 memset(dev->broadcast, 0xff, ETH_ALEN); 233 dev->addr_len = ETH_ALEN; 234 235 ether_setup(dev); 236 237 dev->open = bnep_net_open; 238 dev->stop = bnep_net_close; 239 dev->hard_start_xmit = bnep_net_xmit; 240 dev->get_stats = bnep_net_get_stats; 241 dev->do_ioctl = bnep_net_ioctl; 242 dev->set_mac_address = bnep_net_set_mac_addr; 243 dev->set_multicast_list = bnep_net_set_mc_list; 244 245 dev->watchdog_timeo = HZ * 2; 246 dev->tx_timeout = bnep_net_timeout; 247 } 248