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
 162         if (ntohs(eh->h_proto) >= 1536)
 163                 return eh->h_proto;
 164
 165         if (get_unaligned((u16 *) skb->data) == 0xFFFF)
 166                 return htons(ETH_P_802_3);
 167
 168         return htons(ETH_P_802_2);
 169 }
 170
 171 static inline int bnep_net_proto_filter(struct sk_buff *skb, struct bnep_session *s)
 172 {
 173         u16 proto = bnep_net_eth_proto(skb);
 174         struct bnep_proto_filter *f = s->proto_filter;
 175         int i;
 176
 177         for (i = 0; i < BNEP_MAX_PROTO_FILTERS && f[i].end; i++) {
 178                 if (proto >= f[i].start && proto <= f[i].end)
 179                         return 0;
 180         }
 181
 182         BT_DBG("BNEP: filtered skb %p, proto 0x%.4x", skb, proto);
 183         return 1;
 184 }
 185 #endif
 186
 187 static int bnep_net_xmit(struct sk_buff *skb, struct net_device *dev)
 188 {
 189         struct bnep_session *s = dev->priv;
 190         struct sock *sk = s->sock->sk;
 191
 192         BT_DBG("skb %p, dev %p", skb, dev);
 193
 194 #ifdef CONFIG_BT_BNEP_MC_FILTER
 195         if (bnep_net_mc_filter(skb, s)) {
 196                 kfree_skb(skb);
 197                 return 0;
 198         }
 199 #endif
 200
 201 #ifdef CONFIG_BT_BNEP_PROTO_FILTER
 202         if (bnep_net_proto_filter(skb, s)) {
 203                 kfree_skb(skb);
 204                 return 0;
 205         }
 206 #endif
 207
 208         /*
 209          * We cannot send L2CAP packets from here as we are potentially in a bh.
 210          * So we have to queue them and wake up session thread which is sleeping
 211          * on the sk->sk_sleep.
 212          */
 213         dev->trans_start = jiffies;
 214         skb_queue_tail(&sk->sk_write_queue, skb);
 215         wake_up_interruptible(sk->sk_sleep);
 216
 217         if (skb_queue_len(&sk->sk_write_queue) >= BNEP_TX_QUEUE_LEN) {
 218                 BT_DBG("tx queue is full");
 219
 220                 /* Stop queuing.
 221                  * Session thread will do netif_wake_queue() */
 222                 netif_stop_queue(dev);
 223         }
 224
 225         return 0;
 226 }
 227
 228 void bnep_net_setup(struct net_device *dev)
 229 {
 230
 231         memset(dev->broadcast, 0xff, ETH_ALEN);
 232         dev->addr_len = ETH_ALEN;
 233
 234         ether_setup(dev);
 235
 236         dev->open            = bnep_net_open;
 237         dev->stop            = bnep_net_close;
 238         dev->hard_start_xmit = bnep_net_xmit;
 239         dev->get_stats       = bnep_net_get_stats;
 240         dev->do_ioctl        = bnep_net_ioctl;
 241         dev->set_mac_address = bnep_net_set_mac_addr;
 242         dev->set_multicast_list = bnep_net_set_mc_list;
 243
 244         dev->watchdog_timeo  = HZ * 2;
 245         dev->tx_timeout      = bnep_net_timeout;
 246 }