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 dev_mc_list *dmi = dev->mc_list; 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 for (i = 0; 102 i < netdev_mc_count(dev) && i < BNEP_MAX_MULTICAST_FILTERS; 103 i++) { 104 memcpy(__skb_put(skb, ETH_ALEN), dmi->dmi_addr, ETH_ALEN); 105 memcpy(__skb_put(skb, ETH_ALEN), dmi->dmi_addr, ETH_ALEN); 106 dmi = dmi->next; 107 } 108 r->len = htons(skb->len - len); 109 } 110 111 skb_queue_tail(&sk->sk_write_queue, skb); 112 wake_up_interruptible(sk->sk_sleep); 113 #endif 114 } 115 116 static int bnep_net_set_mac_addr(struct net_device *dev, void *arg) 117 { 118 BT_DBG("%s", dev->name); 119 return 0; 120 } 121 122 static void bnep_net_timeout(struct net_device *dev) 123 { 124 BT_DBG("net_timeout"); 125 netif_wake_queue(dev); 126 } 127 128 #ifdef CONFIG_BT_BNEP_MC_FILTER 129 static inline int bnep_net_mc_filter(struct sk_buff *skb, struct bnep_session *s) 130 { 131 struct ethhdr *eh = (void *) skb->data; 132 133 if ((eh->h_dest[0] & 1) && !test_bit(bnep_mc_hash(eh->h_dest), (ulong *) &s->mc_filter)) 134 return 1; 135 return 0; 136 } 137 #endif 138 139 #ifdef CONFIG_BT_BNEP_PROTO_FILTER 140 /* Determine ether protocol. Based on eth_type_trans. */ 141 static inline u16 bnep_net_eth_proto(struct sk_buff *skb) 142 { 143 struct ethhdr *eh = (void *) skb->data; 144 u16 proto = ntohs(eh->h_proto); 145 146 if (proto >= 1536) 147 return proto; 148 149 if (get_unaligned((__be16 *) skb->data) == htons(0xFFFF)) 150 return ETH_P_802_3; 151 152 return ETH_P_802_2; 153 } 154 155 static inline int bnep_net_proto_filter(struct sk_buff *skb, struct bnep_session *s) 156 { 157 u16 proto = bnep_net_eth_proto(skb); 158 struct bnep_proto_filter *f = s->proto_filter; 159 int i; 160 161 for (i = 0; i < BNEP_MAX_PROTO_FILTERS && f[i].end; i++) { 162 if (proto >= f[i].start && proto <= f[i].end) 163 return 0; 164 } 165 166 BT_DBG("BNEP: filtered skb %p, proto 0x%.4x", skb, proto); 167 return 1; 168 } 169 #endif 170 171 static netdev_tx_t bnep_net_xmit(struct sk_buff *skb, 172 struct net_device *dev) 173 { 174 struct bnep_session *s = netdev_priv(dev); 175 struct sock *sk = s->sock->sk; 176 177 BT_DBG("skb %p, dev %p", skb, dev); 178 179 #ifdef CONFIG_BT_BNEP_MC_FILTER 180 if (bnep_net_mc_filter(skb, s)) { 181 kfree_skb(skb); 182 return NETDEV_TX_OK; 183 } 184 #endif 185 186 #ifdef CONFIG_BT_BNEP_PROTO_FILTER 187 if (bnep_net_proto_filter(skb, s)) { 188 kfree_skb(skb); 189 return NETDEV_TX_OK; 190 } 191 #endif 192 193 /* 194 * We cannot send L2CAP packets from here as we are potentially in a bh. 195 * So we have to queue them and wake up session thread which is sleeping 196 * on the sk->sk_sleep. 197 */ 198 dev->trans_start = jiffies; 199 skb_queue_tail(&sk->sk_write_queue, skb); 200 wake_up_interruptible(sk->sk_sleep); 201 202 if (skb_queue_len(&sk->sk_write_queue) >= BNEP_TX_QUEUE_LEN) { 203 BT_DBG("tx queue is full"); 204 205 /* Stop queuing. 206 * Session thread will do netif_wake_queue() */ 207 netif_stop_queue(dev); 208 } 209 210 return NETDEV_TX_OK; 211 } 212 213 static const struct net_device_ops bnep_netdev_ops = { 214 .ndo_open = bnep_net_open, 215 .ndo_stop = bnep_net_close, 216 .ndo_start_xmit = bnep_net_xmit, 217 .ndo_validate_addr = eth_validate_addr, 218 .ndo_set_multicast_list = bnep_net_set_mc_list, 219 .ndo_set_mac_address = bnep_net_set_mac_addr, 220 .ndo_tx_timeout = bnep_net_timeout, 221 .ndo_change_mtu = eth_change_mtu, 222 223 }; 224 225 void bnep_net_setup(struct net_device *dev) 226 { 227 228 memset(dev->broadcast, 0xff, ETH_ALEN); 229 dev->addr_len = ETH_ALEN; 230 231 ether_setup(dev); 232 dev->netdev_ops = &bnep_netdev_ops; 233 234 dev->watchdog_timeo = HZ * 2; 235 } 236