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