1 /* 2 BNEP implementation for Linux Bluetooth stack (BlueZ). 3 Copyright (C) 2001-2002 Inventel Systemes 4 Written 2001-2002 by 5 Cl�ment 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; 161 162 if (ntohs(eh->h_proto) >= 1536) 163 return eh->h_proto; 164 165 if (get_unaligned((u16 *) skb->data) == 0xFFFF) 166 return htons(ETH_P_802_3); 167 168 return htons(ETH_P_802_2); 169 } 170 171 static inline int bnep_net_proto_filter(struct sk_buff *skb, struct bnep_session *s) 172 { 173 u16 proto = bnep_net_eth_proto(skb); 174 struct bnep_proto_filter *f = s->proto_filter; 175 int i; 176 177 for (i = 0; i < BNEP_MAX_PROTO_FILTERS && f[i].end; i++) { 178 if (proto >= f[i].start && proto <= f[i].end) 179 return 0; 180 } 181 182 BT_DBG("BNEP: filtered skb %p, proto 0x%.4x", skb, proto); 183 return 1; 184 } 185 #endif 186 187 static int bnep_net_xmit(struct sk_buff *skb, struct net_device *dev) 188 { 189 struct bnep_session *s = dev->priv; 190 struct sock *sk = s->sock->sk; 191 192 BT_DBG("skb %p, dev %p", skb, dev); 193 194 #ifdef CONFIG_BT_BNEP_MC_FILTER 195 if (bnep_net_mc_filter(skb, s)) { 196 kfree_skb(skb); 197 return 0; 198 } 199 #endif 200 201 #ifdef CONFIG_BT_BNEP_PROTO_FILTER 202 if (bnep_net_proto_filter(skb, s)) { 203 kfree_skb(skb); 204 return 0; 205 } 206 #endif 207 208 /* 209 * We cannot send L2CAP packets from here as we are potentially in a bh. 210 * So we have to queue them and wake up session thread which is sleeping 211 * on the sk->sk_sleep. 212 */ 213 dev->trans_start = jiffies; 214 skb_queue_tail(&sk->sk_write_queue, skb); 215 wake_up_interruptible(sk->sk_sleep); 216 217 if (skb_queue_len(&sk->sk_write_queue) >= BNEP_TX_QUEUE_LEN) { 218 BT_DBG("tx queue is full"); 219 220 /* Stop queuing. 221 * Session thread will do netif_wake_queue() */ 222 netif_stop_queue(dev); 223 } 224 225 return 0; 226 } 227 228 void bnep_net_setup(struct net_device *dev) 229 { 230 231 memset(dev->broadcast, 0xff, ETH_ALEN); 232 dev->addr_len = ETH_ALEN; 233 234 ether_setup(dev); 235 236 dev->open = bnep_net_open; 237 dev->stop = bnep_net_close; 238 dev->hard_start_xmit = bnep_net_xmit; 239 dev->get_stats = bnep_net_get_stats; 240 dev->do_ioctl = bnep_net_ioctl; 241 dev->set_mac_address = bnep_net_set_mac_addr; 242 dev->set_multicast_list = bnep_net_set_mc_list; 243 244 dev->watchdog_timeo = HZ * 2; 245 dev->tx_timeout = bnep_net_timeout; 246 } 247