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, netdev_mc_count(dev));
  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 netdev_hw_addr *ha;
  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                 i = 0;
 101                 netdev_for_each_mc_addr(ha, dev) {
 102                         if (i == BNEP_MAX_MULTICAST_FILTERS)
 103                                 break;
 104                         memcpy(__skb_put(skb, ETH_ALEN), ha->addr, ETH_ALEN);
 105                         memcpy(__skb_put(skb, ETH_ALEN), ha->addr, ETH_ALEN);
 106                 }
 107                 r->len = htons(skb->len - len);
 108         }
 109
 110         skb_queue_tail(&sk->sk_write_queue, skb);
 111         wake_up_interruptible(sk->sk_sleep);
 112 #endif
 113 }
 114
 115 static int bnep_net_set_mac_addr(struct net_device *dev, void *arg)
 116 {
 117         BT_DBG("%s", dev->name);
 118         return 0;
 119 }
 120
 121 static void bnep_net_timeout(struct net_device *dev)
 122 {
 123         BT_DBG("net_timeout");
 124         netif_wake_queue(dev);
 125 }
 126
 127 #ifdef CONFIG_BT_BNEP_MC_FILTER
 128 static inline int bnep_net_mc_filter(struct sk_buff *skb, struct bnep_session *s)
 129 {
 130         struct ethhdr *eh = (void *) skb->data;
 131
 132         if ((eh->h_dest[0] & 1) && !test_bit(bnep_mc_hash(eh->h_dest), (ulong *) &s->mc_filter))
 133                 return 1;
 134         return 0;
 135 }
 136 #endif
 137
 138 #ifdef CONFIG_BT_BNEP_PROTO_FILTER
 139 /* Determine ether protocol. Based on eth_type_trans. */
 140 static inline u16 bnep_net_eth_proto(struct sk_buff *skb)
 141 {
 142         struct ethhdr *eh = (void *) skb->data;
 143         u16 proto = ntohs(eh->h_proto);
 144
 145         if (proto >= 1536)
 146                 return proto;
 147
 148         if (get_unaligned((__be16 *) skb->data) == htons(0xFFFF))
 149                 return ETH_P_802_3;
 150
 151         return ETH_P_802_2;
 152 }
 153
 154 static inline int bnep_net_proto_filter(struct sk_buff *skb, struct bnep_session *s)
 155 {
 156         u16 proto = bnep_net_eth_proto(skb);
 157         struct bnep_proto_filter *f = s->proto_filter;
 158         int i;
 159
 160         for (i = 0; i < BNEP_MAX_PROTO_FILTERS && f[i].end; i++) {
 161                 if (proto >= f[i].start && proto <= f[i].end)
 162                         return 0;
 163         }
 164
 165         BT_DBG("BNEP: filtered skb %p, proto 0x%.4x", skb, proto);
 166         return 1;
 167 }
 168 #endif
 169
 170 static netdev_tx_t bnep_net_xmit(struct sk_buff *skb,
 171                                  struct net_device *dev)
 172 {
 173         struct bnep_session *s = netdev_priv(dev);
 174         struct sock *sk = s->sock->sk;
 175
 176         BT_DBG("skb %p, dev %p", skb, dev);
 177
 178 #ifdef CONFIG_BT_BNEP_MC_FILTER
 179         if (bnep_net_mc_filter(skb, s)) {
 180                 kfree_skb(skb);
 181                 return NETDEV_TX_OK;
 182         }
 183 #endif
 184
 185 #ifdef CONFIG_BT_BNEP_PROTO_FILTER
 186         if (bnep_net_proto_filter(skb, s)) {
 187                 kfree_skb(skb);
 188                 return NETDEV_TX_OK;
 189         }
 190 #endif
 191
 192         /*
 193          * We cannot send L2CAP packets from here as we are potentially in a bh.
 194          * So we have to queue them and wake up session thread which is sleeping
 195          * on the sk->sk_sleep.
 196          */
 197         dev->trans_start = jiffies;
 198         skb_queue_tail(&sk->sk_write_queue, skb);
 199         wake_up_interruptible(sk->sk_sleep);
 200
 201         if (skb_queue_len(&sk->sk_write_queue) >= BNEP_TX_QUEUE_LEN) {
 202                 BT_DBG("tx queue is full");
 203
 204                 /* Stop queuing.
 205                  * Session thread will do netif_wake_queue() */
 206                 netif_stop_queue(dev);
 207         }
 208
 209         return NETDEV_TX_OK;
 210 }
 211
 212 static const struct net_device_ops bnep_netdev_ops = {
 213         .ndo_open            = bnep_net_open,
 214         .ndo_stop            = bnep_net_close,
 215         .ndo_start_xmit      = bnep_net_xmit,
 216         .ndo_validate_addr   = eth_validate_addr,
 217         .ndo_set_multicast_list = bnep_net_set_mc_list,
 218         .ndo_set_mac_address = bnep_net_set_mac_addr,
 219         .ndo_tx_timeout      = bnep_net_timeout,
 220         .ndo_change_mtu      = eth_change_mtu,
 221
 222 };
 223
 224 void bnep_net_setup(struct net_device *dev)
 225 {
 226
 227         memset(dev->broadcast, 0xff, ETH_ALEN);
 228         dev->addr_len = ETH_ALEN;
 229
 230         ether_setup(dev);
 231         dev->netdev_ops = &bnep_netdev_ops;
 232
 233         dev->watchdog_timeo  = HZ * 2;
 234 }