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/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 #ifndef CONFIG_BT_BNEP_DEBUG
  45 #undef  BT_DBG
  46 #define BT_DBG( A... )
  47 #endif
  48
  49 #define BNEP_TX_QUEUE_LEN 20
  50
  51 static int bnep_net_open(struct net_device *dev)
  52 {
  53         netif_start_queue(dev);
  54         return 0;
  55 }
  56
  57 static int bnep_net_close(struct net_device *dev)
  58 {
  59         netif_stop_queue(dev);
  60         return 0;
  61 }
  62
  63 static struct net_device_stats *bnep_net_get_stats(struct net_device *dev)
  64 {
  65         struct bnep_session *s = dev->priv;
  66         return &s->stats;
  67 }
  68
  69 static void bnep_net_set_mc_list(struct net_device *dev)
  70 {
  71 #ifdef CONFIG_BT_BNEP_MC_FILTER
  72         struct bnep_session *s = dev->priv;
  73         struct sock *sk = s->sock->sk;
  74         struct bnep_set_filter_req *r;
  75         struct sk_buff *skb;
  76         int size;
  77
  78         BT_DBG("%s mc_count %d", dev->name, dev->mc_count);
  79
  80         size = sizeof(*r) + (BNEP_MAX_MULTICAST_FILTERS + 1) * ETH_ALEN * 2;
  81         skb  = alloc_skb(size, GFP_ATOMIC);
  82         if (!skb) {
  83                 BT_ERR("%s Multicast list allocation failed", dev->name);
  84                 return;
  85         }
  86
  87         r = (void *) skb->data;
  88         __skb_put(skb, sizeof(*r));
  89
  90         r->type = BNEP_CONTROL;
  91         r->ctrl = BNEP_FILTER_MULTI_ADDR_SET;
  92
  93         if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
  94                 u8 start[ETH_ALEN] = { 0x01 };
  95
  96                 /* Request all addresses */
  97                 memcpy(__skb_put(skb, ETH_ALEN), start, ETH_ALEN);
  98                 memcpy(__skb_put(skb, ETH_ALEN), dev->broadcast, ETH_ALEN);
  99                 r->len = htons(ETH_ALEN * 2);
 100         } else {
 101                 struct dev_mc_list *dmi = dev->mc_list;
 102                 int i, len = skb->len;
 103
 104                 if (dev->flags & IFF_BROADCAST) {
 105                         memcpy(__skb_put(skb, ETH_ALEN), dev->broadcast, ETH_ALEN);
 106                         memcpy(__skb_put(skb, ETH_ALEN), dev->broadcast, ETH_ALEN);
 107                 }
 108
 109                 /* FIXME: We should group addresses here. */
 110
 111                 for (i = 0; i < dev->mc_count && i < BNEP_MAX_MULTICAST_FILTERS; i++) {
 112                         memcpy(__skb_put(skb, ETH_ALEN), dmi->dmi_addr, ETH_ALEN);
 113                         memcpy(__skb_put(skb, ETH_ALEN), dmi->dmi_addr, ETH_ALEN);
 114                         dmi = dmi->next;
 115                 }
 116                 r->len = htons(skb->len - len);
 117         }
 118
 119         skb_queue_tail(&sk->sk_write_queue, skb);
 120         wake_up_interruptible(sk->sk_sleep);
 121 #endif
 122 }
 123
 124 static int bnep_net_set_mac_addr(struct net_device *dev, void *arg)
 125 {
 126         BT_DBG("%s", dev->name);
 127         return 0;
 128 }
 129
 130 static void bnep_net_timeout(struct net_device *dev)
 131 {
 132         BT_DBG("net_timeout");
 133         netif_wake_queue(dev);
 134 }
 135
 136 static int bnep_net_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 137 {
 138         return -EINVAL;
 139 }
 140
 141 #ifdef CONFIG_BT_BNEP_MC_FILTER
 142 static inline int bnep_net_mc_filter(struct sk_buff *skb, struct bnep_session *s)
 143 {
 144         struct ethhdr *eh = (void *) skb->data;
 145
 146         if ((eh->h_dest[0] & 1) && !test_bit(bnep_mc_hash(eh->h_dest), (ulong *) &s->mc_filter))
 147                 return 1;
 148         return 0;
 149 }
 150 #endif
 151
 152 #ifdef CONFIG_BT_BNEP_PROTO_FILTER
 153 /* Determine ether protocol. Based on eth_type_trans. */
 154 static inline u16 bnep_net_eth_proto(struct sk_buff *skb)
 155 {
 156         struct ethhdr *eh = (void *) skb->data;
 157         u16 proto = ntohs(eh->h_proto);
 158
 159         if (proto >= 1536)
 160                 return proto;
 161
 162         if (get_unaligned((__be16 *) skb->data) == htons(0xFFFF))
 163                 return ETH_P_802_3;
 164
 165         return ETH_P_802_2;
 166 }
 167
 168 static inline int bnep_net_proto_filter(struct sk_buff *skb, struct bnep_session *s)
 169 {
 170         u16 proto = bnep_net_eth_proto(skb);
 171         struct bnep_proto_filter *f = s->proto_filter;
 172         int i;
 173
 174         for (i = 0; i < BNEP_MAX_PROTO_FILTERS && f[i].end; i++) {
 175                 if (proto >= f[i].start && proto <= f[i].end)
 176                         return 0;
 177         }
 178
 179         BT_DBG("BNEP: filtered skb %p, proto 0x%.4x", skb, proto);
 180         return 1;
 181 }
 182 #endif
 183
 184 static int bnep_net_xmit(struct sk_buff *skb, struct net_device *dev)
 185 {
 186         struct bnep_session *s = dev->priv;
 187         struct sock *sk = s->sock->sk;
 188
 189         BT_DBG("skb %p, dev %p", skb, dev);
 190
 191 #ifdef CONFIG_BT_BNEP_MC_FILTER
 192         if (bnep_net_mc_filter(skb, s)) {
 193                 kfree_skb(skb);
 194                 return 0;
 195         }
 196 #endif
 197
 198 #ifdef CONFIG_BT_BNEP_PROTO_FILTER
 199         if (bnep_net_proto_filter(skb, s)) {
 200                 kfree_skb(skb);
 201                 return 0;
 202         }
 203 #endif
 204
 205         /*
 206          * We cannot send L2CAP packets from here as we are potentially in a bh.
 207          * So we have to queue them and wake up session thread which is sleeping
 208          * on the sk->sk_sleep.
 209          */
 210         dev->trans_start = jiffies;
 211         skb_queue_tail(&sk->sk_write_queue, skb);
 212         wake_up_interruptible(sk->sk_sleep);
 213
 214         if (skb_queue_len(&sk->sk_write_queue) >= BNEP_TX_QUEUE_LEN) {
 215                 BT_DBG("tx queue is full");
 216
 217                 /* Stop queuing.
 218                  * Session thread will do netif_wake_queue() */
 219                 netif_stop_queue(dev);
 220         }
 221
 222         return 0;
 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
 233         dev->open            = bnep_net_open;
 234         dev->stop            = bnep_net_close;
 235         dev->hard_start_xmit = bnep_net_xmit;
 236         dev->get_stats       = bnep_net_get_stats;
 237         dev->do_ioctl        = bnep_net_ioctl;
 238         dev->set_mac_address = bnep_net_set_mac_addr;
 239         dev->set_multicast_list = bnep_net_set_mc_list;
 240
 241         dev->watchdog_timeo  = HZ * 2;
 242         dev->tx_timeout      = bnep_net_timeout;
 243 }