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