net/bluetooth/bnep/netdev.c

   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/etherdevice.h>
  29
  30 #include <net/bluetooth/bluetooth.h>
  31 #include <net/bluetooth/hci_core.h>
  32 #include <net/bluetooth/l2cap.h>
  33
  34 #include "bnep.h"
  35
  36 #define BNEP_TX_QUEUE_LEN 20
  37
  38 static int bnep_net_open(struct net_device *dev)
  39 {
  40         netif_start_queue(dev);
  41         return 0;
  42 }
  43
  44 static int bnep_net_close(struct net_device *dev)
  45 {
  46         netif_stop_queue(dev);
  47         return 0;
  48 }
  49
  50 static void bnep_net_set_mc_list(struct net_device *dev)
  51 {
  52 #ifdef CONFIG_BT_BNEP_MC_FILTER
  53         struct bnep_session *s = netdev_priv(dev);
  54         struct sock *sk = s->sock->sk;
  55         struct bnep_set_filter_req *r;
  56         struct sk_buff *skb;
  57         int size;
  58
  59         BT_DBG("%s mc_count %d", dev->name, netdev_mc_count(dev));
  60
  61         size = sizeof(*r) + (BNEP_MAX_MULTICAST_FILTERS + 1) * ETH_ALEN * 2;
  62         skb  = alloc_skb(size, GFP_ATOMIC);
  63         if (!skb) {
  64                 BT_ERR("%s Multicast list allocation failed", dev->name);
  65                 return;
  66         }
  67
  68         r = (void *) skb->data;
  69         __skb_put(skb, sizeof(*r));
  70
  71         r->type = BNEP_CONTROL;
  72         r->ctrl = BNEP_FILTER_MULTI_ADDR_SET;
  73
  74         if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
  75                 u8 start[ETH_ALEN] = { 0x01 };
  76
  77                 /* Request all addresses */
  78                 __skb_put_data(skb, start, ETH_ALEN);
  79                 __skb_put_data(skb, dev->broadcast, ETH_ALEN);
  80                 r->len = htons(ETH_ALEN * 2);
  81         } else {
  82                 struct netdev_hw_addr *ha;
  83                 int i, len = skb->len;
  84
  85                 if (dev->flags & IFF_BROADCAST) {
  86                         __skb_put_data(skb, dev->broadcast, ETH_ALEN);
  87                         __skb_put_data(skb, dev->broadcast, ETH_ALEN);
  88                 }
  89
  90                 /* FIXME: We should group addresses here. */
  91
  92                 i = 0;
  93                 netdev_for_each_mc_addr(ha, dev) {
  94                         if (i == BNEP_MAX_MULTICAST_FILTERS)
  95                                 break;
  96                         __skb_put_data(skb, ha->addr, ETH_ALEN);
  97                         __skb_put_data(skb, ha->addr, ETH_ALEN);
  98
  99                         i++;
 100                 }
 101                 r->len = htons(skb->len - len);
 102         }
 103
 104         skb_queue_tail(&sk->sk_write_queue, skb);
 105         wake_up_interruptible(sk_sleep(sk));
 106 #endif
 107 }
 108
 109 static int bnep_net_set_mac_addr(struct net_device *dev, void *arg)
 110 {
 111         BT_DBG("%s", dev->name);
 112         return 0;
 113 }
 114
 115 static void bnep_net_timeout(struct net_device *dev, unsigned int txqueue)
 116 {
 117         BT_DBG("net_timeout");
 118         netif_wake_queue(dev);
 119 }
 120
 121 #ifdef CONFIG_BT_BNEP_MC_FILTER
 122 static int bnep_net_mc_filter(struct sk_buff *skb, struct bnep_session *s)
 123 {
 124         struct ethhdr *eh = (void *) skb->data;
 125
 126         if ((eh->h_dest[0] & 1) && !test_bit(bnep_mc_hash(eh->h_dest), (ulong *) &s->mc_filter))
 127                 return 1;
 128         return 0;
 129 }
 130 #endif
 131
 132 #ifdef CONFIG_BT_BNEP_PROTO_FILTER
 133 /* Determine ether protocol. Based on eth_type_trans. */
 134 static u16 bnep_net_eth_proto(struct sk_buff *skb)
 135 {
 136         struct ethhdr *eh = (void *) skb->data;
 137         u16 proto = ntohs(eh->h_proto);
 138
 139         if (proto >= ETH_P_802_3_MIN)
 140                 return proto;
 141
 142         if (get_unaligned((__be16 *) skb->data) == htons(0xFFFF))
 143                 return ETH_P_802_3;
 144
 145         return ETH_P_802_2;
 146 }
 147
 148 static int bnep_net_proto_filter(struct sk_buff *skb, struct bnep_session *s)
 149 {
 150         u16 proto = bnep_net_eth_proto(skb);
 151         struct bnep_proto_filter *f = s->proto_filter;
 152         int i;
 153
 154         for (i = 0; i < BNEP_MAX_PROTO_FILTERS && f[i].end; i++) {
 155                 if (proto >= f[i].start && proto <= f[i].end)
 156                         return 0;
 157         }
 158
 159         BT_DBG("BNEP: filtered skb %p, proto 0x%.4x", skb, proto);
 160         return 1;
 161 }
 162 #endif
 163
 164 static netdev_tx_t bnep_net_xmit(struct sk_buff *skb,
 165                                  struct net_device *dev)
 166 {
 167         struct bnep_session *s = netdev_priv(dev);
 168         struct sock *sk = s->sock->sk;
 169
 170         BT_DBG("skb %p, dev %p", skb, dev);
 171
 172 #ifdef CONFIG_BT_BNEP_MC_FILTER
 173         if (bnep_net_mc_filter(skb, s)) {
 174                 kfree_skb(skb);
 175                 return NETDEV_TX_OK;
 176         }
 177 #endif
 178
 179 #ifdef CONFIG_BT_BNEP_PROTO_FILTER
 180         if (bnep_net_proto_filter(skb, s)) {
 181                 kfree_skb(skb);
 182                 return NETDEV_TX_OK;
 183         }
 184 #endif
 185
 186         /*
 187          * We cannot send L2CAP packets from here as we are potentially in a bh.
 188          * So we have to queue them and wake up session thread which is sleeping
 189          * on the sk_sleep(sk).
 190          */
 191         netif_trans_update(dev);
 192         skb_queue_tail(&sk->sk_write_queue, skb);
 193         wake_up_interruptible(sk_sleep(sk));
 194
 195         if (skb_queue_len(&sk->sk_write_queue) >= BNEP_TX_QUEUE_LEN) {
 196                 BT_DBG("tx queue is full");
 197
 198                 /* Stop queuing.
 199                  * Session thread will do netif_wake_queue() */
 200                 netif_stop_queue(dev);
 201         }
 202
 203         return NETDEV_TX_OK;
 204 }
 205
 206 static const struct net_device_ops bnep_netdev_ops = {
 207         .ndo_open            = bnep_net_open,
 208         .ndo_stop            = bnep_net_close,
 209         .ndo_start_xmit      = bnep_net_xmit,
 210         .ndo_validate_addr   = eth_validate_addr,
 211         .ndo_set_rx_mode     = bnep_net_set_mc_list,
 212         .ndo_set_mac_address = bnep_net_set_mac_addr,
 213         .ndo_tx_timeout      = bnep_net_timeout,
 214
 215 };
 216
 217 void bnep_net_setup(struct net_device *dev)
 218 {
 219
 220         eth_broadcast_addr(dev->broadcast);
 221         dev->addr_len = ETH_ALEN;
 222
 223         ether_setup(dev);
 224         dev->min_mtu = 0;
 225         dev->max_mtu = ETH_MAX_MTU;
 226         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
 227         dev->netdev_ops = &bnep_netdev_ops;
 228
 229         dev->watchdog_timeo  = HZ * 2;
 230 }