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 dev_mc_list *dmi = dev->mc_list;
  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                 for (i = 0;
 102                      i < netdev_mc_count(dev) && i < BNEP_MAX_MULTICAST_FILTERS;
 103                      i++) {
 104                         memcpy(__skb_put(skb, ETH_ALEN), dmi->dmi_addr, ETH_ALEN);
 105                         memcpy(__skb_put(skb, ETH_ALEN), dmi->dmi_addr, ETH_ALEN);
 106                         dmi = dmi->next;
 107                 }
 108                 r->len = htons(skb->len - len);
 109         }
 110
 111         skb_queue_tail(&sk->sk_write_queue, skb);
 112         wake_up_interruptible(sk->sk_sleep);
 113 #endif
 114 }
 115
 116 static int bnep_net_set_mac_addr(struct net_device *dev, void *arg)
 117 {
 118         BT_DBG("%s", dev->name);
 119         return 0;
 120 }
 121
 122 static void bnep_net_timeout(struct net_device *dev)
 123 {
 124         BT_DBG("net_timeout");
 125         netif_wake_queue(dev);
 126 }
 127
 128 #ifdef CONFIG_BT_BNEP_MC_FILTER
 129 static inline int bnep_net_mc_filter(struct sk_buff *skb, struct bnep_session *s)
 130 {
 131         struct ethhdr *eh = (void *) skb->data;
 132
 133         if ((eh->h_dest[0] & 1) && !test_bit(bnep_mc_hash(eh->h_dest), (ulong *) &s->mc_filter))
 134                 return 1;
 135         return 0;
 136 }
 137 #endif
 138
 139 #ifdef CONFIG_BT_BNEP_PROTO_FILTER
 140 /* Determine ether protocol. Based on eth_type_trans. */
 141 static inline u16 bnep_net_eth_proto(struct sk_buff *skb)
 142 {
 143         struct ethhdr *eh = (void *) skb->data;
 144         u16 proto = ntohs(eh->h_proto);
 145
 146         if (proto >= 1536)
 147                 return proto;
 148
 149         if (get_unaligned((__be16 *) skb->data) == htons(0xFFFF))
 150                 return ETH_P_802_3;
 151
 152         return ETH_P_802_2;
 153 }
 154
 155 static inline int bnep_net_proto_filter(struct sk_buff *skb, struct bnep_session *s)
 156 {
 157         u16 proto = bnep_net_eth_proto(skb);
 158         struct bnep_proto_filter *f = s->proto_filter;
 159         int i;
 160
 161         for (i = 0; i < BNEP_MAX_PROTO_FILTERS && f[i].end; i++) {
 162                 if (proto >= f[i].start && proto <= f[i].end)
 163                         return 0;
 164         }
 165
 166         BT_DBG("BNEP: filtered skb %p, proto 0x%.4x", skb, proto);
 167         return 1;
 168 }
 169 #endif
 170
 171 static netdev_tx_t bnep_net_xmit(struct sk_buff *skb,
 172                                  struct net_device *dev)
 173 {
 174         struct bnep_session *s = netdev_priv(dev);
 175         struct sock *sk = s->sock->sk;
 176
 177         BT_DBG("skb %p, dev %p", skb, dev);
 178
 179 #ifdef CONFIG_BT_BNEP_MC_FILTER
 180         if (bnep_net_mc_filter(skb, s)) {
 181                 kfree_skb(skb);
 182                 return NETDEV_TX_OK;
 183         }
 184 #endif
 185
 186 #ifdef CONFIG_BT_BNEP_PROTO_FILTER
 187         if (bnep_net_proto_filter(skb, s)) {
 188                 kfree_skb(skb);
 189                 return NETDEV_TX_OK;
 190         }
 191 #endif
 192
 193         /*
 194          * We cannot send L2CAP packets from here as we are potentially in a bh.
 195          * So we have to queue them and wake up session thread which is sleeping
 196          * on the sk->sk_sleep.
 197          */
 198         dev->trans_start = jiffies;
 199         skb_queue_tail(&sk->sk_write_queue, skb);
 200         wake_up_interruptible(sk->sk_sleep);
 201
 202         if (skb_queue_len(&sk->sk_write_queue) >= BNEP_TX_QUEUE_LEN) {
 203                 BT_DBG("tx queue is full");
 204
 205                 /* Stop queuing.
 206                  * Session thread will do netif_wake_queue() */
 207                 netif_stop_queue(dev);
 208         }
 209
 210         return NETDEV_TX_OK;
 211 }
 212
 213 static const struct net_device_ops bnep_netdev_ops = {
 214         .ndo_open            = bnep_net_open,
 215         .ndo_stop            = bnep_net_close,
 216         .ndo_start_xmit      = bnep_net_xmit,
 217         .ndo_validate_addr   = eth_validate_addr,
 218         .ndo_set_multicast_list = bnep_net_set_mc_list,
 219         .ndo_set_mac_address = bnep_net_set_mac_addr,
 220         .ndo_tx_timeout      = bnep_net_timeout,
 221         .ndo_change_mtu      = eth_change_mtu,
 222
 223 };
 224
 225 void bnep_net_setup(struct net_device *dev)
 226 {
 227
 228         memset(dev->broadcast, 0xff, ETH_ALEN);
 229         dev->addr_len = ETH_ALEN;
 230
 231         ether_setup(dev);
 232         dev->netdev_ops = &bnep_netdev_ops;
 233
 234         dev->watchdog_timeo  = HZ * 2;
 235 }