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 struct net_device_stats *bnep_net_get_stats(struct net_device *dev) 59 { 60 struct bnep_session *s = netdev_priv(dev); 61 return &s->stats; 62 } 63 64 static void bnep_net_set_mc_list(struct net_device *dev) 65 { 66 #ifdef CONFIG_BT_BNEP_MC_FILTER 67 struct bnep_session *s = netdev_priv(dev); 68 struct sock *sk = s->sock->sk; 69 struct bnep_set_filter_req *r; 70 struct sk_buff *skb; 71 int size; 72 73 BT_DBG("%s mc_count %d", dev->name, dev->mc_count); 74 75 size = sizeof(*r) + (BNEP_MAX_MULTICAST_FILTERS + 1) * ETH_ALEN * 2; 76 skb = alloc_skb(size, GFP_ATOMIC); 77 if (!skb) { 78 BT_ERR("%s Multicast list allocation failed", dev->name); 79 return; 80 } 81 82 r = (void *) skb->data; 83 __skb_put(skb, sizeof(*r)); 84 85 r->type = BNEP_CONTROL; 86 r->ctrl = BNEP_FILTER_MULTI_ADDR_SET; 87 88 if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) { 89 u8 start[ETH_ALEN] = { 0x01 }; 90 91 /* Request all addresses */ 92 memcpy(__skb_put(skb, ETH_ALEN), start, ETH_ALEN); 93 memcpy(__skb_put(skb, ETH_ALEN), dev->broadcast, ETH_ALEN); 94 r->len = htons(ETH_ALEN * 2); 95 } else { 96 struct dev_mc_list *dmi = dev->mc_list; 97 int i, len = skb->len; 98 99 if (dev->flags & IFF_BROADCAST) { 100 memcpy(__skb_put(skb, ETH_ALEN), dev->broadcast, ETH_ALEN); 101 memcpy(__skb_put(skb, ETH_ALEN), dev->broadcast, ETH_ALEN); 102 } 103 104 /* FIXME: We should group addresses here. */ 105 106 for (i = 0; i < dev->mc_count && i < BNEP_MAX_MULTICAST_FILTERS; i++) { 107 memcpy(__skb_put(skb, ETH_ALEN), dmi->dmi_addr, ETH_ALEN); 108 memcpy(__skb_put(skb, ETH_ALEN), dmi->dmi_addr, ETH_ALEN); 109 dmi = dmi->next; 110 } 111 r->len = htons(skb->len - len); 112 } 113 114 skb_queue_tail(&sk->sk_write_queue, skb); 115 wake_up_interruptible(sk->sk_sleep); 116 #endif 117 } 118 119 static int bnep_net_set_mac_addr(struct net_device *dev, void *arg) 120 { 121 BT_DBG("%s", dev->name); 122 return 0; 123 } 124 125 static void bnep_net_timeout(struct net_device *dev) 126 { 127 BT_DBG("net_timeout"); 128 netif_wake_queue(dev); 129 } 130 131 static int bnep_net_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) 132 { 133 return -EINVAL; 134 } 135 136 #ifdef CONFIG_BT_BNEP_MC_FILTER 137 static inline int bnep_net_mc_filter(struct sk_buff *skb, struct bnep_session *s) 138 { 139 struct ethhdr *eh = (void *) skb->data; 140 141 if ((eh->h_dest[0] & 1) && !test_bit(bnep_mc_hash(eh->h_dest), (ulong *) &s->mc_filter)) 142 return 1; 143 return 0; 144 } 145 #endif 146 147 #ifdef CONFIG_BT_BNEP_PROTO_FILTER 148 /* Determine ether protocol. Based on eth_type_trans. */ 149 static inline u16 bnep_net_eth_proto(struct sk_buff *skb) 150 { 151 struct ethhdr *eh = (void *) skb->data; 152 u16 proto = ntohs(eh->h_proto); 153 154 if (proto >= 1536) 155 return proto; 156 157 if (get_unaligned((__be16 *) skb->data) == htons(0xFFFF)) 158 return ETH_P_802_3; 159 160 return ETH_P_802_2; 161 } 162 163 static inline int bnep_net_proto_filter(struct sk_buff *skb, struct bnep_session *s) 164 { 165 u16 proto = bnep_net_eth_proto(skb); 166 struct bnep_proto_filter *f = s->proto_filter; 167 int i; 168 169 for (i = 0; i < BNEP_MAX_PROTO_FILTERS && f[i].end; i++) { 170 if (proto >= f[i].start && proto <= f[i].end) 171 return 0; 172 } 173 174 BT_DBG("BNEP: filtered skb %p, proto 0x%.4x", skb, proto); 175 return 1; 176 } 177 #endif 178 179 static int bnep_net_xmit(struct sk_buff *skb, struct net_device *dev) 180 { 181 struct bnep_session *s = netdev_priv(dev); 182 struct sock *sk = s->sock->sk; 183 184 BT_DBG("skb %p, dev %p", skb, dev); 185 186 #ifdef CONFIG_BT_BNEP_MC_FILTER 187 if (bnep_net_mc_filter(skb, s)) { 188 kfree_skb(skb); 189 return 0; 190 } 191 #endif 192 193 #ifdef CONFIG_BT_BNEP_PROTO_FILTER 194 if (bnep_net_proto_filter(skb, s)) { 195 kfree_skb(skb); 196 return 0; 197 } 198 #endif 199 200 /* 201 * We cannot send L2CAP packets from here as we are potentially in a bh. 202 * So we have to queue them and wake up session thread which is sleeping 203 * on the sk->sk_sleep. 204 */ 205 dev->trans_start = jiffies; 206 skb_queue_tail(&sk->sk_write_queue, skb); 207 wake_up_interruptible(sk->sk_sleep); 208 209 if (skb_queue_len(&sk->sk_write_queue) >= BNEP_TX_QUEUE_LEN) { 210 BT_DBG("tx queue is full"); 211 212 /* Stop queuing. 213 * Session thread will do netif_wake_queue() */ 214 netif_stop_queue(dev); 215 } 216 217 return 0; 218 } 219 220 void bnep_net_setup(struct net_device *dev) 221 { 222 223 memset(dev->broadcast, 0xff, ETH_ALEN); 224 dev->addr_len = ETH_ALEN; 225 226 ether_setup(dev); 227 228 dev->open = bnep_net_open; 229 dev->stop = bnep_net_close; 230 dev->hard_start_xmit = bnep_net_xmit; 231 dev->get_stats = bnep_net_get_stats; 232 dev->do_ioctl = bnep_net_ioctl; 233 dev->set_mac_address = bnep_net_set_mac_addr; 234 dev->set_multicast_list = bnep_net_set_mc_list; 235 236 dev->watchdog_timeo = HZ * 2; 237 dev->tx_timeout = bnep_net_timeout; 238 } 239