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