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