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 /*
  29  * $Id: netdev.c,v 1.8 2002/08/04 21:23:58 maxk Exp $
  30  */
  31
  32 #include <linux/module.h>
  33
  34 #include <linux/socket.h>
  35 #include <linux/netdevice.h>
  36 #include <linux/etherdevice.h>
  37 #include <linux/skbuff.h>
  38 #include <linux/wait.h>
  39
  40 #include <asm/unaligned.h>
  41
  42 #include <net/bluetooth/bluetooth.h>
  43 #include <net/bluetooth/hci_core.h>
  44 #include <net/bluetooth/l2cap.h>
  45
  46 #include "bnep.h"
  47
  48 #ifndef CONFIG_BT_BNEP_DEBUG
  49 #undef  BT_DBG
  50 #define BT_DBG( A... )
  51 #endif
  52
  53 #define BNEP_TX_QUEUE_LEN 20
  54
  55 static int bnep_net_open(struct net_device *dev)
  56 {
  57         netif_start_queue(dev);
  58         return 0;
  59 }
  60
  61 static int bnep_net_close(struct net_device *dev)
  62 {
  63         netif_stop_queue(dev);
  64         return 0;
  65 }
  66
  67 static struct net_device_stats *bnep_net_get_stats(struct net_device *dev)
  68 {
  69         struct bnep_session *s = dev->priv;
  70         return &s->stats;
  71 }
  72
  73 static void bnep_net_set_mc_list(struct net_device *dev)
  74 {
  75 #ifdef CONFIG_BT_BNEP_MC_FILTER
  76         struct bnep_session *s = dev->priv;
  77         struct sock *sk = s->sock->sk;
  78         struct bnep_set_filter_req *r;
  79         struct sk_buff *skb;
  80         int size;
  81
  82         BT_DBG("%s mc_count %d", dev->name, dev->mc_count);
  83
  84         size = sizeof(*r) + (BNEP_MAX_MULTICAST_FILTERS + 1) * ETH_ALEN * 2;
  85         skb  = alloc_skb(size, GFP_ATOMIC);
  86         if (!skb) {
  87                 BT_ERR("%s Multicast list allocation failed", dev->name);
  88                 return;
  89         }
  90
  91         r = (void *) skb->data;
  92         __skb_put(skb, sizeof(*r));
  93
  94         r->type = BNEP_CONTROL;
  95         r->ctrl = BNEP_FILTER_MULTI_ADDR_SET;
  96
  97         if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
  98                 u8 start[ETH_ALEN] = { 0x01 };
  99
 100                 /* Request all addresses */
 101                 memcpy(__skb_put(skb, ETH_ALEN), start, ETH_ALEN);
 102                 memcpy(__skb_put(skb, ETH_ALEN), dev->broadcast, ETH_ALEN);
 103                 r->len = htons(ETH_ALEN * 2);
 104         } else {
 105                 struct dev_mc_list *dmi = dev->mc_list;
 106                 int i, len = skb->len;
 107
 108                 if (dev->flags & IFF_BROADCAST) {
 109                         memcpy(__skb_put(skb, ETH_ALEN), dev->broadcast, ETH_ALEN);
 110                         memcpy(__skb_put(skb, ETH_ALEN), dev->broadcast, ETH_ALEN);
 111                 }
 112
 113                 /* FIXME: We should group addresses here. */
 114
 115                 for (i = 0; i < dev->mc_count && i < BNEP_MAX_MULTICAST_FILTERS; i++) {
 116                         memcpy(__skb_put(skb, ETH_ALEN), dmi->dmi_addr, ETH_ALEN);
 117                         memcpy(__skb_put(skb, ETH_ALEN), dmi->dmi_addr, ETH_ALEN);
 118                         dmi = dmi->next;
 119                 }
 120                 r->len = htons(skb->len - len);
 121         }
 122
 123         skb_queue_tail(&sk->sk_write_queue, skb);
 124         wake_up_interruptible(sk->sk_sleep);
 125 #endif
 126 }
 127
 128 static int bnep_net_set_mac_addr(struct net_device *dev, void *arg)
 129 {
 130         BT_DBG("%s", dev->name);
 131         return 0;
 132 }
 133
 134 static void bnep_net_timeout(struct net_device *dev)
 135 {
 136         BT_DBG("net_timeout");
 137         netif_wake_queue(dev);
 138 }
 139
 140 static int bnep_net_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 141 {
 142         return -EINVAL;
 143 }
 144
 145 #ifdef CONFIG_BT_BNEP_MC_FILTER
 146 static inline int bnep_net_mc_filter(struct sk_buff *skb, struct bnep_session *s)
 147 {
 148         struct ethhdr *eh = (void *) skb->data;
 149
 150         if ((eh->h_dest[0] & 1) && !test_bit(bnep_mc_hash(eh->h_dest), (ulong *) &s->mc_filter))
 151                 return 1;
 152         return 0;
 153 }
 154 #endif
 155
 156 #ifdef CONFIG_BT_BNEP_PROTO_FILTER
 157 /* Determine ether protocol. Based on eth_type_trans. */
 158 static inline u16 bnep_net_eth_proto(struct sk_buff *skb)
 159 {
 160         struct ethhdr *eh = (void *) skb->data;
 161         u16 proto = ntohs(eh->h_proto);
 162
 163         if (proto >= 1536)
 164                 return proto;
 165
 166         if (get_unaligned((__be16 *) skb->data) == htons(0xFFFF))
 167                 return ETH_P_802_3;
 168
 169         return ETH_P_802_2;
 170 }
 171
 172 static inline int bnep_net_proto_filter(struct sk_buff *skb, struct bnep_session *s)
 173 {
 174         u16 proto = bnep_net_eth_proto(skb);
 175         struct bnep_proto_filter *f = s->proto_filter;
 176         int i;
 177
 178         for (i = 0; i < BNEP_MAX_PROTO_FILTERS && f[i].end; i++) {
 179                 if (proto >= f[i].start && proto <= f[i].end)
 180                         return 0;
 181         }
 182
 183         BT_DBG("BNEP: filtered skb %p, proto 0x%.4x", skb, proto);
 184         return 1;
 185 }
 186 #endif
 187
 188 static int bnep_net_xmit(struct sk_buff *skb, struct net_device *dev)
 189 {
 190         struct bnep_session *s = dev->priv;
 191         struct sock *sk = s->sock->sk;
 192
 193         BT_DBG("skb %p, dev %p", skb, dev);
 194
 195 #ifdef CONFIG_BT_BNEP_MC_FILTER
 196         if (bnep_net_mc_filter(skb, s)) {
 197                 kfree_skb(skb);
 198                 return 0;
 199         }
 200 #endif
 201
 202 #ifdef CONFIG_BT_BNEP_PROTO_FILTER
 203         if (bnep_net_proto_filter(skb, s)) {
 204                 kfree_skb(skb);
 205                 return 0;
 206         }
 207 #endif
 208
 209         /*
 210          * We cannot send L2CAP packets from here as we are potentially in a bh.
 211          * So we have to queue them and wake up session thread which is sleeping
 212          * on the sk->sk_sleep.
 213          */
 214         dev->trans_start = jiffies;
 215         skb_queue_tail(&sk->sk_write_queue, skb);
 216         wake_up_interruptible(sk->sk_sleep);
 217
 218         if (skb_queue_len(&sk->sk_write_queue) >= BNEP_TX_QUEUE_LEN) {
 219                 BT_DBG("tx queue is full");
 220
 221                 /* Stop queuing.
 222                  * Session thread will do netif_wake_queue() */
 223                 netif_stop_queue(dev);
 224         }
 225
 226         return 0;
 227 }
 228
 229 void bnep_net_setup(struct net_device *dev)
 230 {
 231
 232         memset(dev->broadcast, 0xff, ETH_ALEN);
 233         dev->addr_len = ETH_ALEN;
 234
 235         ether_setup(dev);
 236
 237         dev->open            = bnep_net_open;
 238         dev->stop            = bnep_net_close;
 239         dev->hard_start_xmit = bnep_net_xmit;
 240         dev->get_stats       = bnep_net_get_stats;
 241         dev->do_ioctl        = bnep_net_ioctl;
 242         dev->set_mac_address = bnep_net_set_mac_addr;
 243         dev->set_multicast_list = bnep_net_set_mc_list;
 244
 245         dev->watchdog_timeo  = HZ * 2;
 246         dev->tx_timeout      = bnep_net_timeout;
 247 }