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