netdev.c
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上传日期:2013-04-10
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文件大小:6k
- /*
- BNEP implementation for Linux Bluetooth stack (BlueZ).
- Copyright (C) 2001-2002 Inventel Systemes
- Written 2001-2002 by
- Cl閙ent Moreau <clement.moreau@inventel.fr>
- David Libault <david.libault@inventel.fr>
- Copyright (C) 2002 Maxim Krasnyanskiy <maxk@qualcomm.com>
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License version 2 as
- published by the Free Software Foundation;
- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
- OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
- IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
- CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
- WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
- ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
- COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
- SOFTWARE IS DISCLAIMED.
- */
- /*
- * $Id: netdev.c,v 1.7 2002/07/14 05:39:26 maxk Exp $
- */
- #include <linux/config.h>
- #include <linux/module.h>
- #include <linux/socket.h>
- #include <linux/netdevice.h>
- #include <linux/etherdevice.h>
- #include <linux/skbuff.h>
- #include <linux/wait.h>
- #include <asm/unaligned.h>
- #include <net/bluetooth/bluetooth.h>
- #include <net/bluetooth/hci_core.h>
- #include <net/bluetooth/l2cap.h>
- #include "bnep.h"
- #ifndef CONFIG_BNEP_DEBUG
- #undef BT_DBG
- #define BT_DBG( A... )
- #endif
- #define BNEP_TX_QUEUE_LEN 20
- static int bnep_net_open(struct net_device *dev)
- {
- netif_start_queue(dev);
- return 0;
- }
- static int bnep_net_close(struct net_device *dev)
- {
- netif_stop_queue(dev);
- return 0;
- }
- static struct net_device_stats *bnep_net_get_stats(struct net_device *dev)
- {
- struct bnep_session *s = dev->priv;
- return &s->stats;
- }
- static void bnep_net_set_mc_list(struct net_device *dev)
- {
- #ifdef CONFIG_BNEP_MC_FILTER
- struct bnep_session *s = dev->priv;
- struct sock *sk = s->sock->sk;
- struct bnep_set_filter_req *r;
- struct sk_buff *skb;
- int size;
- BT_DBG("%s mc_count %d", dev->name, dev->mc_count);
- size = sizeof(*r) + (BNEP_MAX_MULTICAST_FILTERS + 1) * ETH_ALEN * 2;
- skb = alloc_skb(size, GFP_ATOMIC);
- if (!skb) {
- BT_ERR("%s Multicast list allocation failed", dev->name);
- return;
- }
- r = (void *) skb->data;
- __skb_put(skb, sizeof(*r));
- r->type = BNEP_CONTROL;
- r->ctrl = BNEP_FILTER_MULTI_ADDR_SET;
- if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
- u8 start[ETH_ALEN] = { 0x01 };
- /* Request all addresses */
- memcpy(__skb_put(skb, ETH_ALEN), start, ETH_ALEN);
- memcpy(__skb_put(skb, ETH_ALEN), dev->broadcast, ETH_ALEN);
- r->len = htons(ETH_ALEN * 2);
- } else {
- struct dev_mc_list *dmi = dev->mc_list;
- int i, len = skb->len;
- if (dev->flags & IFF_BROADCAST) {
- memcpy(__skb_put(skb, ETH_ALEN), dev->broadcast, ETH_ALEN);
- memcpy(__skb_put(skb, ETH_ALEN), dev->broadcast, ETH_ALEN);
- }
-
- /* FIXME: We should group addresses here. */
- for (i = 0; i < dev->mc_count && i < BNEP_MAX_MULTICAST_FILTERS; i++) {
- memcpy(__skb_put(skb, ETH_ALEN), dmi->dmi_addr, ETH_ALEN);
- memcpy(__skb_put(skb, ETH_ALEN), dmi->dmi_addr, ETH_ALEN);
- dmi = dmi->next;
- }
- r->len = htons(skb->len - len);
- }
- skb_queue_tail(&sk->write_queue, skb);
- wake_up_interruptible(sk->sleep);
- #endif
- }
- static int bnep_net_set_mac_addr(struct net_device *dev, void *arg)
- {
- BT_DBG("%s", dev->name);
- return 0;
- }
- static void bnep_net_timeout(struct net_device *dev)
- {
- BT_DBG("net_timeout");
- netif_wake_queue(dev);
- }
- static int bnep_net_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
- {
- return -EINVAL;
- }
- #ifdef CONFIG_BNEP_MC_FILTER
- static inline int bnep_net_mc_filter(struct sk_buff *skb, struct bnep_session *s)
- {
- struct ethhdr *eh = (void *) skb->data;
- if ((eh->h_dest[0] & 1) && !test_bit(bnep_mc_hash(eh->h_dest), &s->mc_filter))
- return 1;
- return 0;
- }
- #endif
- #ifdef CONFIG_BNEP_PROTO_FILTER
- /* Determine ether protocol. Based on eth_type_trans. */
- static inline __u16 bnep_net_eth_proto(struct sk_buff *skb)
- {
- struct ethhdr *eh = (void *) skb->data;
-
- if (ntohs(eh->h_proto) >= 1536)
- return eh->h_proto;
-
- if (get_unaligned((__u16 *) skb->data) == 0xFFFF)
- return htons(ETH_P_802_3);
-
- return htons(ETH_P_802_2);
- }
- static inline int bnep_net_proto_filter(struct sk_buff *skb, struct bnep_session *s)
- {
- __u16 proto = bnep_net_eth_proto(skb);
- struct bnep_proto_filter *f = s->proto_filter;
- int i;
-
- for (i = 0; i < BNEP_MAX_PROTO_FILTERS && f[i].end; i++) {
- if (proto >= f[i].start && proto <= f[i].end)
- return 0;
- }
- BT_DBG("BNEP: filtered skb %p, proto 0x%.4x", skb, proto);
- return 1;
- }
- #endif
- static int bnep_net_xmit(struct sk_buff *skb, struct net_device *dev)
- {
- struct bnep_session *s = dev->priv;
- struct sock *sk = s->sock->sk;
- BT_DBG("skb %p, dev %p", skb, dev);
- #ifdef CONFIG_BNEP_MC_FILTER
- if (bnep_net_mc_filter(skb, s)) {
- kfree_skb(skb);
- return 0;
- }
- #endif
-
- #ifdef CONFIG_BNEP_PROTO_FILTER
- if (bnep_net_proto_filter(skb, s)) {
- kfree_skb(skb);
- return 0;
- }
- #endif
-
- /*
- * We cannot send L2CAP packets from here as we are potentially in a bh.
- * So we have to queue them and wake up session thread which is sleeping
- * on the sk->sleep.
- */
- dev->trans_start = jiffies;
- skb_queue_tail(&sk->write_queue, skb);
- wake_up_interruptible(sk->sleep);
- if (skb_queue_len(&sk->write_queue) >= BNEP_TX_QUEUE_LEN) {
- BT_DBG("tx queue is full");
- /* Stop queuing.
- * Session thread will do netif_wake_queue() */
- netif_stop_queue(dev);
- }
- return 0;
- }
- int bnep_net_init(struct net_device *dev)
- {
- struct bnep_session *s = dev->priv;
- memcpy(dev->dev_addr, s->eh.h_dest, ETH_ALEN);
- dev->addr_len = ETH_ALEN;
- ether_setup(dev);
- dev->open = bnep_net_open;
- dev->stop = bnep_net_close;
- dev->hard_start_xmit = bnep_net_xmit;
- dev->get_stats = bnep_net_get_stats;
- dev->do_ioctl = bnep_net_ioctl;
- dev->set_mac_address = bnep_net_set_mac_addr;
- dev->set_multicast_list = bnep_net_set_mc_list;
- dev->watchdog_timeo = HZ * 2;
- dev->tx_timeout = bnep_net_timeout;
- return 0;
- }