1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 BNEP implementation for Linux Bluetooth stack (BlueZ). 4 Copyright (C) 2001-2002 Inventel Systemes 5 Written 2001-2002 by 6 Clément Moreau <clement.moreau@inventel.fr> 7 David Libault <david.libault@inventel.fr> 8 9 Copyright (C) 2002 Maxim Krasnyansky <maxk@qualcomm.com> 10 11 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS 12 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 13 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. 14 IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY 15 CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES 16 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 17 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 18 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 19 20 ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS, 21 COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS 22 SOFTWARE IS DISCLAIMED. 23 */ 24 25 #include <linux/etherdevice.h> 26 27 #include <net/bluetooth/bluetooth.h> 28 #include <net/bluetooth/hci_core.h> 29 #include <net/bluetooth/l2cap.h> 30 31 #include "bnep.h" 32 33 #define BNEP_TX_QUEUE_LEN 20 34 35 static int bnep_net_open(struct net_device *dev) 36 { 37 netif_start_queue(dev); 38 return 0; 39 } 40 41 static int bnep_net_close(struct net_device *dev) 42 { 43 netif_stop_queue(dev); 44 return 0; 45 } 46 47 static void bnep_net_set_mc_list(struct net_device *dev) 48 { 49 #ifdef CONFIG_BT_BNEP_MC_FILTER 50 struct bnep_session *s = netdev_priv(dev); 51 struct sock *sk = s->sock->sk; 52 struct bnep_set_filter_req *r; 53 struct sk_buff *skb; 54 int size; 55 56 BT_DBG("%s mc_count %d", dev->name, netdev_mc_count(dev)); 57 58 size = sizeof(*r) + (BNEP_MAX_MULTICAST_FILTERS + 1) * ETH_ALEN * 2; 59 skb = alloc_skb(size, GFP_ATOMIC); 60 if (!skb) { 61 BT_ERR("%s Multicast list allocation failed", dev->name); 62 return; 63 } 64 65 r = (void *) skb->data; 66 __skb_put(skb, sizeof(*r)); 67 68 r->type = BNEP_CONTROL; 69 r->ctrl = BNEP_FILTER_MULTI_ADDR_SET; 70 71 if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) { 72 u8 start[ETH_ALEN] = { 0x01 }; 73 74 /* Request all addresses */ 75 __skb_put_data(skb, start, ETH_ALEN); 76 __skb_put_data(skb, dev->broadcast, ETH_ALEN); 77 r->len = htons(ETH_ALEN * 2); 78 } else { 79 struct netdev_hw_addr *ha; 80 int i, len = skb->len; 81 82 if (dev->flags & IFF_BROADCAST) { 83 __skb_put_data(skb, dev->broadcast, ETH_ALEN); 84 __skb_put_data(skb, dev->broadcast, ETH_ALEN); 85 } 86 87 /* FIXME: We should group addresses here. */ 88 89 i = 0; 90 netdev_for_each_mc_addr(ha, dev) { 91 if (i == BNEP_MAX_MULTICAST_FILTERS) 92 break; 93 __skb_put_data(skb, ha->addr, ETH_ALEN); 94 __skb_put_data(skb, ha->addr, ETH_ALEN); 95 96 i++; 97 } 98 r->len = htons(skb->len - len); 99 } 100 101 skb_queue_tail(&sk->sk_write_queue, skb); 102 wake_up_interruptible(sk_sleep(sk)); 103 #endif 104 } 105 106 static int bnep_net_set_mac_addr(struct net_device *dev, void *arg) 107 { 108 BT_DBG("%s", dev->name); 109 return 0; 110 } 111 112 static void bnep_net_timeout(struct net_device *dev, unsigned int txqueue) 113 { 114 BT_DBG("net_timeout"); 115 netif_wake_queue(dev); 116 } 117 118 #ifdef CONFIG_BT_BNEP_MC_FILTER 119 static int bnep_net_mc_filter(struct sk_buff *skb, struct bnep_session *s) 120 { 121 struct ethhdr *eh = (void *) skb->data; 122 123 if ((eh->h_dest[0] & 1) && !test_bit(bnep_mc_hash(eh->h_dest), (ulong *) &s->mc_filter)) 124 return 1; 125 return 0; 126 } 127 #endif 128 129 #ifdef CONFIG_BT_BNEP_PROTO_FILTER 130 /* Determine ether protocol. Based on eth_type_trans. */ 131 static u16 bnep_net_eth_proto(struct sk_buff *skb) 132 { 133 struct ethhdr *eh = (void *) skb->data; 134 u16 proto = ntohs(eh->h_proto); 135 136 if (proto >= ETH_P_802_3_MIN) 137 return proto; 138 139 if (get_unaligned((__be16 *) skb->data) == htons(0xFFFF)) 140 return ETH_P_802_3; 141 142 return ETH_P_802_2; 143 } 144 145 static int bnep_net_proto_filter(struct sk_buff *skb, struct bnep_session *s) 146 { 147 u16 proto = bnep_net_eth_proto(skb); 148 struct bnep_proto_filter *f = s->proto_filter; 149 int i; 150 151 for (i = 0; i < BNEP_MAX_PROTO_FILTERS && f[i].end; i++) { 152 if (proto >= f[i].start && proto <= f[i].end) 153 return 0; 154 } 155 156 BT_DBG("BNEP: filtered skb %p, proto 0x%.4x", skb, proto); 157 return 1; 158 } 159 #endif 160 161 static netdev_tx_t bnep_net_xmit(struct sk_buff *skb, 162 struct net_device *dev) 163 { 164 struct bnep_session *s = netdev_priv(dev); 165 struct sock *sk = s->sock->sk; 166 167 BT_DBG("skb %p, dev %p", skb, dev); 168 169 if (!pskb_may_pull(skb, ETH_HLEN)) { 170 dev->stats.tx_dropped++; 171 kfree_skb(skb); 172 return NETDEV_TX_OK; 173 } 174 175 #ifdef CONFIG_BT_BNEP_MC_FILTER 176 if (bnep_net_mc_filter(skb, s)) { 177 kfree_skb(skb); 178 return NETDEV_TX_OK; 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 NETDEV_TX_OK; 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_sleep(sk). 193 */ 194 netif_trans_update(dev); 195 skb_queue_tail(&sk->sk_write_queue, skb); 196 wake_up_interruptible(sk_sleep(sk)); 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 NETDEV_TX_OK; 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_rx_mode = bnep_net_set_mc_list, 215 .ndo_set_mac_address = bnep_net_set_mac_addr, 216 .ndo_tx_timeout = bnep_net_timeout, 217 218 }; 219 220 void bnep_net_setup(struct net_device *dev) 221 { 222 223 eth_broadcast_addr(dev->broadcast); 224 dev->addr_len = ETH_ALEN; 225 226 ether_setup(dev); 227 dev->min_mtu = ETH_MIN_MTU; 228 dev->max_mtu = ETH_MAX_MTU; 229 dev->priv_flags &= ~IFF_TX_SKB_SHARING; 230 dev->netdev_ops = &bnep_netdev_ops; 231 232 dev->watchdog_timeo = HZ * 2; 233 } 234