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