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[/] [or1k_soc_on_altera_embedded_dev_kit/] [trunk/] [linux-2.6/] [linux-2.6.24/] [net/] [bluetooth/] [bnep/] [core.c] - Blame information for rev 3

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/*
   BNEP implementation for Linux Bluetooth stack (BlueZ).
   Copyright (C) 2001-2002 Inventel Systemes
   Written 2001-2002 by
        Clément Moreau <clement.moreau@inventel.fr>
        David Libault  <david.libault@inventel.fr>
 
   Copyright (C) 2002 Maxim Krasnyansky <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: core.c,v 1.20 2002/08/04 21:23:58 maxk Exp $
 */
 
#include <linux/module.h>
 
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/signal.h>
#include <linux/init.h>
#include <linux/wait.h>
#include <linux/freezer.h>
#include <linux/errno.h>
#include <linux/net.h>
#include <net/sock.h>
 
#include <linux/socket.h>
#include <linux/file.h>
 
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.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_BT_BNEP_DEBUG
#undef  BT_DBG
#define BT_DBG(D...)
#endif
 
#define VERSION "1.2"
 
static LIST_HEAD(bnep_session_list);
static DECLARE_RWSEM(bnep_session_sem);
 
static struct bnep_session *__bnep_get_session(u8 *dst)
{
        struct bnep_session *s;
        struct list_head *p;
 
        BT_DBG("");
 
        list_for_each(p, &bnep_session_list) {
                s = list_entry(p, struct bnep_session, list);
                if (!compare_ether_addr(dst, s->eh.h_source))
                        return s;
        }
        return NULL;
}
 
static void __bnep_link_session(struct bnep_session *s)
{
        /* It's safe to call __module_get() here because sessions are added
           by the socket layer which has to hold the refference to this module.
         */
        __module_get(THIS_MODULE);
        list_add(&s->list, &bnep_session_list);
}
 
static void __bnep_unlink_session(struct bnep_session *s)
{
        list_del(&s->list);
        module_put(THIS_MODULE);
}
 
static int bnep_send(struct bnep_session *s, void *data, size_t len)
{
        struct socket *sock = s->sock;
        struct kvec iv = { data, len };
 
        return kernel_sendmsg(sock, &s->msg, &iv, 1, len);
}
 
static int bnep_send_rsp(struct bnep_session *s, u8 ctrl, u16 resp)
{
        struct bnep_control_rsp rsp;
        rsp.type = BNEP_CONTROL;
        rsp.ctrl = ctrl;
        rsp.resp = htons(resp);
        return bnep_send(s, &rsp, sizeof(rsp));
}
 
#ifdef CONFIG_BT_BNEP_PROTO_FILTER
static inline void bnep_set_default_proto_filter(struct bnep_session *s)
{
        /* (IPv4, ARP)  */
        s->proto_filter[0].start = ETH_P_IP;
        s->proto_filter[0].end   = ETH_P_ARP;
        /* (RARP, AppleTalk) */
        s->proto_filter[1].start = ETH_P_RARP;
        s->proto_filter[1].end   = ETH_P_AARP;
        /* (IPX, IPv6) */
        s->proto_filter[2].start = ETH_P_IPX;
        s->proto_filter[2].end   = ETH_P_IPV6;
}
#endif
 
static int bnep_ctrl_set_netfilter(struct bnep_session *s, __be16 *data, int len)
{
        int n;
 
        if (len < 2)
                return -EILSEQ;
 
        n = ntohs(get_unaligned(data));
        data++; len -= 2;
 
        if (len < n)
                return -EILSEQ;
 
        BT_DBG("filter len %d", n);
 
#ifdef CONFIG_BT_BNEP_PROTO_FILTER
        n /= 4;
        if (n <= BNEP_MAX_PROTO_FILTERS) {
                struct bnep_proto_filter *f = s->proto_filter;
                int i;
 
                for (i = 0; i < n; i++) {
                        f[i].start = ntohs(get_unaligned(data++));
                        f[i].end   = ntohs(get_unaligned(data++));
 
                        BT_DBG("proto filter start %d end %d",
                                f[i].start, f[i].end);
                }
 
                if (i < BNEP_MAX_PROTO_FILTERS)
                        memset(f + i, 0, sizeof(*f));
 
                if (n == 0)
                        bnep_set_default_proto_filter(s);
 
                bnep_send_rsp(s, BNEP_FILTER_NET_TYPE_RSP, BNEP_SUCCESS);
        } else {
                bnep_send_rsp(s, BNEP_FILTER_NET_TYPE_RSP, BNEP_FILTER_LIMIT_REACHED);
        }
#else
        bnep_send_rsp(s, BNEP_FILTER_NET_TYPE_RSP, BNEP_FILTER_UNSUPPORTED_REQ);
#endif
        return 0;
}
 
static int bnep_ctrl_set_mcfilter(struct bnep_session *s, u8 *data, int len)
{
        int n;
 
        if (len < 2)
                return -EILSEQ;
 
        n = ntohs(get_unaligned((__be16 *) data));
        data += 2; len -= 2;
 
        if (len < n)
                return -EILSEQ;
 
        BT_DBG("filter len %d", n);
 
#ifdef CONFIG_BT_BNEP_MC_FILTER
        n /= (ETH_ALEN * 2);
 
        if (n > 0) {
                s->mc_filter = 0;
 
                /* Always send broadcast */
                set_bit(bnep_mc_hash(s->dev->broadcast), (ulong *) &s->mc_filter);
 
                /* Add address ranges to the multicast hash */
                for (; n > 0; n--) {
                        u8 a1[6], *a2;
 
                        memcpy(a1, data, ETH_ALEN); data += ETH_ALEN;
                        a2 = data; data += ETH_ALEN;
 
                        BT_DBG("mc filter %s -> %s",
                                batostr((void *) a1), batostr((void *) a2));
 
                        #define INCA(a) { int i = 5; while (i >=0 && ++a[i--] == 0); }
 
                        /* Iterate from a1 to a2 */
                        set_bit(bnep_mc_hash(a1), (ulong *) &s->mc_filter);
                        while (memcmp(a1, a2, 6) < 0 && s->mc_filter != ~0LL) {
                                INCA(a1);
                                set_bit(bnep_mc_hash(a1), (ulong *) &s->mc_filter);
                        }
                }
        }
 
        BT_DBG("mc filter hash 0x%llx", s->mc_filter);
 
        bnep_send_rsp(s, BNEP_FILTER_MULTI_ADDR_RSP, BNEP_SUCCESS);
#else
        bnep_send_rsp(s, BNEP_FILTER_MULTI_ADDR_RSP, BNEP_FILTER_UNSUPPORTED_REQ);
#endif
        return 0;
}
 
static int bnep_rx_control(struct bnep_session *s, void *data, int len)
{
        u8  cmd = *(u8 *)data;
        int err = 0;
 
        data++; len--;
 
        switch (cmd) {
        case BNEP_CMD_NOT_UNDERSTOOD:
        case BNEP_SETUP_CONN_REQ:
        case BNEP_SETUP_CONN_RSP:
        case BNEP_FILTER_NET_TYPE_RSP:
        case BNEP_FILTER_MULTI_ADDR_RSP:
                /* Ignore these for now */
                break;
 
        case BNEP_FILTER_NET_TYPE_SET:
                err = bnep_ctrl_set_netfilter(s, data, len);
                break;
 
        case BNEP_FILTER_MULTI_ADDR_SET:
                err = bnep_ctrl_set_mcfilter(s, data, len);
                break;
 
        default: {
                        u8 pkt[3];
                        pkt[0] = BNEP_CONTROL;
                        pkt[1] = BNEP_CMD_NOT_UNDERSTOOD;
                        pkt[2] = cmd;
                        bnep_send(s, pkt, sizeof(pkt));
                }
                break;
        }
 
        return err;
}
 
static int bnep_rx_extension(struct bnep_session *s, struct sk_buff *skb)
{
        struct bnep_ext_hdr *h;
        int err = 0;
 
        do {
                h = (void *) skb->data;
                if (!skb_pull(skb, sizeof(*h))) {
                        err = -EILSEQ;
                        break;
                }
 
                BT_DBG("type 0x%x len %d", h->type, h->len);
 
                switch (h->type & BNEP_TYPE_MASK) {
                case BNEP_EXT_CONTROL:
                        bnep_rx_control(s, skb->data, skb->len);
                        break;
 
                default:
                        /* Unknown extension, skip it. */
                        break;
                }
 
                if (!skb_pull(skb, h->len)) {
                        err = -EILSEQ;
                        break;
                }
        } while (!err && (h->type & BNEP_EXT_HEADER));
 
        return err;
}
 
static u8 __bnep_rx_hlen[] = {
        ETH_HLEN,     /* BNEP_GENERAL */
        0,            /* BNEP_CONTROL */
        2,            /* BNEP_COMPRESSED */
        ETH_ALEN + 2, /* BNEP_COMPRESSED_SRC_ONLY */
        ETH_ALEN + 2  /* BNEP_COMPRESSED_DST_ONLY */
};
#define BNEP_RX_TYPES   (sizeof(__bnep_rx_hlen) - 1)
 
static inline int bnep_rx_frame(struct bnep_session *s, struct sk_buff *skb)
{
        struct net_device *dev = s->dev;
        struct sk_buff *nskb;
        u8 type;
 
        dev->last_rx = jiffies;
        s->stats.rx_bytes += skb->len;
 
        type = *(u8 *) skb->data; skb_pull(skb, 1);
 
        if ((type & BNEP_TYPE_MASK) > BNEP_RX_TYPES)
                goto badframe;
 
        if ((type & BNEP_TYPE_MASK) == BNEP_CONTROL) {
                bnep_rx_control(s, skb->data, skb->len);
                kfree_skb(skb);
                return 0;
        }
 
        skb_reset_mac_header(skb);
 
        /* Verify and pull out header */
        if (!skb_pull(skb, __bnep_rx_hlen[type & BNEP_TYPE_MASK]))
                goto badframe;
 
        s->eh.h_proto = get_unaligned((__be16 *) (skb->data - 2));
 
        if (type & BNEP_EXT_HEADER) {
                if (bnep_rx_extension(s, skb) < 0)
                        goto badframe;
        }
 
        /* Strip 802.1p header */
        if (ntohs(s->eh.h_proto) == 0x8100) {
                if (!skb_pull(skb, 4))
                        goto badframe;
                s->eh.h_proto = get_unaligned((__be16 *) (skb->data - 2));
        }
 
        /* We have to alloc new skb and copy data here :(. Because original skb
         * may not be modified and because of the alignment requirements. */
        nskb = alloc_skb(2 + ETH_HLEN + skb->len, GFP_KERNEL);
        if (!nskb) {
                s->stats.rx_dropped++;
                kfree_skb(skb);
                return -ENOMEM;
        }
        skb_reserve(nskb, 2);
 
        /* Decompress header and construct ether frame */
        switch (type & BNEP_TYPE_MASK) {
        case BNEP_COMPRESSED:
                memcpy(__skb_put(nskb, ETH_HLEN), &s->eh, ETH_HLEN);
                break;
 
        case BNEP_COMPRESSED_SRC_ONLY:
                memcpy(__skb_put(nskb, ETH_ALEN), s->eh.h_dest, ETH_ALEN);
                memcpy(__skb_put(nskb, ETH_ALEN), skb_mac_header(skb), ETH_ALEN);
                put_unaligned(s->eh.h_proto, (__be16 *) __skb_put(nskb, 2));
                break;
 
        case BNEP_COMPRESSED_DST_ONLY:
                memcpy(__skb_put(nskb, ETH_ALEN), skb_mac_header(skb),
                       ETH_ALEN);
                memcpy(__skb_put(nskb, ETH_ALEN + 2), s->eh.h_source,
                       ETH_ALEN + 2);
                break;
 
        case BNEP_GENERAL:
                memcpy(__skb_put(nskb, ETH_ALEN * 2), skb_mac_header(skb),
                       ETH_ALEN * 2);
                put_unaligned(s->eh.h_proto, (__be16 *) __skb_put(nskb, 2));
                break;
        }
 
        skb_copy_from_linear_data(skb, __skb_put(nskb, skb->len), skb->len);
        kfree_skb(skb);
 
        s->stats.rx_packets++;
        nskb->ip_summed = CHECKSUM_NONE;
        nskb->protocol  = eth_type_trans(nskb, dev);
        netif_rx_ni(nskb);
        return 0;
 
badframe:
        s->stats.rx_errors++;
        kfree_skb(skb);
        return 0;
}
 
static u8 __bnep_tx_types[] = {
        BNEP_GENERAL,
        BNEP_COMPRESSED_SRC_ONLY,
        BNEP_COMPRESSED_DST_ONLY,
        BNEP_COMPRESSED
};
 
static inline int bnep_tx_frame(struct bnep_session *s, struct sk_buff *skb)
{
        struct ethhdr *eh = (void *) skb->data;
        struct socket *sock = s->sock;
        struct kvec iv[3];
        int len = 0, il = 0;
        u8 type = 0;
 
        BT_DBG("skb %p dev %p type %d", skb, skb->dev, skb->pkt_type);
 
        if (!skb->dev) {
                /* Control frame sent by us */
                goto send;
        }
 
        iv[il++] = (struct kvec) { &type, 1 };
        len++;
 
        if (!compare_ether_addr(eh->h_dest, s->eh.h_source))
                type |= 0x01;
 
        if (!compare_ether_addr(eh->h_source, s->eh.h_dest))
                type |= 0x02;
 
        if (type)
                skb_pull(skb, ETH_ALEN * 2);
 
        type = __bnep_tx_types[type];
        switch (type) {
        case BNEP_COMPRESSED_SRC_ONLY:
                iv[il++] = (struct kvec) { eh->h_source, ETH_ALEN };
                len += ETH_ALEN;
                break;
 
        case BNEP_COMPRESSED_DST_ONLY:
                iv[il++] = (struct kvec) { eh->h_dest, ETH_ALEN };
                len += ETH_ALEN;
                break;
        }
 
send:
        iv[il++] = (struct kvec) { skb->data, skb->len };
        len += skb->len;
 
        /* FIXME: linearize skb */
        {
                len = kernel_sendmsg(sock, &s->msg, iv, il, len);
        }
        kfree_skb(skb);
 
        if (len > 0) {
                s->stats.tx_bytes += len;
                s->stats.tx_packets++;
                return 0;
        }
 
        return len;
}
 
static int bnep_session(void *arg)
{
        struct bnep_session *s = arg;
        struct net_device *dev = s->dev;
        struct sock *sk = s->sock->sk;
        struct sk_buff *skb;
        wait_queue_t wait;
 
        BT_DBG("");
 
        daemonize("kbnepd %s", dev->name);
        set_user_nice(current, -15);
 
        init_waitqueue_entry(&wait, current);
        add_wait_queue(sk->sk_sleep, &wait);
        while (!atomic_read(&s->killed)) {
                set_current_state(TASK_INTERRUPTIBLE);
 
                // RX
                while ((skb = skb_dequeue(&sk->sk_receive_queue))) {
                        skb_orphan(skb);
                        bnep_rx_frame(s, skb);
                }
 
                if (sk->sk_state != BT_CONNECTED)
                        break;
 
                // TX
                while ((skb = skb_dequeue(&sk->sk_write_queue)))
                        if (bnep_tx_frame(s, skb))
                                break;
                netif_wake_queue(dev);
 
                schedule();
        }
        set_current_state(TASK_RUNNING);
        remove_wait_queue(sk->sk_sleep, &wait);
 
        /* Cleanup session */
        down_write(&bnep_session_sem);
 
        /* Delete network device */
        unregister_netdev(dev);
 
        /* Release the socket */
        fput(s->sock->file);
 
        __bnep_unlink_session(s);
 
        up_write(&bnep_session_sem);
        free_netdev(dev);
        return 0;
}
 
static struct device *bnep_get_device(struct bnep_session *session)
{
        bdaddr_t *src = &bt_sk(session->sock->sk)->src;
        bdaddr_t *dst = &bt_sk(session->sock->sk)->dst;
        struct hci_dev *hdev;
        struct hci_conn *conn;
 
        hdev = hci_get_route(dst, src);
        if (!hdev)
                return NULL;
 
        conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK, dst);
 
        hci_dev_put(hdev);
 
        return conn ? &conn->dev : NULL;
}
 
int bnep_add_connection(struct bnep_connadd_req *req, struct socket *sock)
{
        struct net_device *dev;
        struct bnep_session *s, *ss;
        u8 dst[ETH_ALEN], src[ETH_ALEN];
        int err;
 
        BT_DBG("");
 
        baswap((void *) dst, &bt_sk(sock->sk)->dst);
        baswap((void *) src, &bt_sk(sock->sk)->src);
 
        /* session struct allocated as private part of net_device */
        dev = alloc_netdev(sizeof(struct bnep_session),
                           (*req->device) ? req->device : "bnep%d",
                           bnep_net_setup);
        if (!dev)
                return -ENOMEM;
 
        down_write(&bnep_session_sem);
 
        ss = __bnep_get_session(dst);
        if (ss && ss->state == BT_CONNECTED) {
                err = -EEXIST;
                goto failed;
        }
 
        s = dev->priv;
 
        /* This is rx header therefore addresses are swapped.
         * ie eh.h_dest is our local address. */
        memcpy(s->eh.h_dest,   &src, ETH_ALEN);
        memcpy(s->eh.h_source, &dst, ETH_ALEN);
        memcpy(dev->dev_addr, s->eh.h_dest, ETH_ALEN);
 
        s->dev   = dev;
        s->sock  = sock;
        s->role  = req->role;
        s->state = BT_CONNECTED;
 
        s->msg.msg_flags = MSG_NOSIGNAL;
 
#ifdef CONFIG_BT_BNEP_MC_FILTER
        /* Set default mc filter */
        set_bit(bnep_mc_hash(dev->broadcast), (ulong *) &s->mc_filter);
#endif
 
#ifdef CONFIG_BT_BNEP_PROTO_FILTER
        /* Set default protocol filter */
        bnep_set_default_proto_filter(s);
#endif
 
        SET_NETDEV_DEV(dev, bnep_get_device(s));
 
        err = register_netdev(dev);
        if (err) {
                goto failed;
        }
 
        __bnep_link_session(s);
 
        err = kernel_thread(bnep_session, s, CLONE_KERNEL);
        if (err < 0) {
                /* Session thread start failed, gotta cleanup. */
                unregister_netdev(dev);
                __bnep_unlink_session(s);
                goto failed;
        }
 
        up_write(&bnep_session_sem);
        strcpy(req->device, dev->name);
        return 0;
 
failed:
        up_write(&bnep_session_sem);
        free_netdev(dev);
        return err;
}
 
int bnep_del_connection(struct bnep_conndel_req *req)
{
        struct bnep_session *s;
        int  err = 0;
 
        BT_DBG("");
 
        down_read(&bnep_session_sem);
 
        s = __bnep_get_session(req->dst);
        if (s) {
                /* Wakeup user-space which is polling for socket errors.
                 * This is temporary hack untill we have shutdown in L2CAP */
                s->sock->sk->sk_err = EUNATCH;
 
                /* Kill session thread */
                atomic_inc(&s->killed);
                wake_up_interruptible(s->sock->sk->sk_sleep);
        } else
                err = -ENOENT;
 
        up_read(&bnep_session_sem);
        return err;
}
 
static void __bnep_copy_ci(struct bnep_conninfo *ci, struct bnep_session *s)
{
        memcpy(ci->dst, s->eh.h_source, ETH_ALEN);
        strcpy(ci->device, s->dev->name);
        ci->flags = s->flags;
        ci->state = s->state;
        ci->role  = s->role;
}
 
int bnep_get_connlist(struct bnep_connlist_req *req)
{
        struct list_head *p;
        int err = 0, n = 0;
 
        down_read(&bnep_session_sem);
 
        list_for_each(p, &bnep_session_list) {
                struct bnep_session *s;
                struct bnep_conninfo ci;
 
                s = list_entry(p, struct bnep_session, list);
 
                __bnep_copy_ci(&ci, s);
 
                if (copy_to_user(req->ci, &ci, sizeof(ci))) {
                        err = -EFAULT;
                        break;
                }
 
                if (++n >= req->cnum)
                        break;
 
                req->ci++;
        }
        req->cnum = n;
 
        up_read(&bnep_session_sem);
        return err;
}
 
int bnep_get_conninfo(struct bnep_conninfo *ci)
{
        struct bnep_session *s;
        int err = 0;
 
        down_read(&bnep_session_sem);
 
        s = __bnep_get_session(ci->dst);
        if (s)
                __bnep_copy_ci(ci, s);
        else
                err = -ENOENT;
 
        up_read(&bnep_session_sem);
        return err;
}
 
static int __init bnep_init(void)
{
        char flt[50] = "";
 
        l2cap_load();
 
#ifdef CONFIG_BT_BNEP_PROTO_FILTER
        strcat(flt, "protocol ");
#endif
 
#ifdef CONFIG_BT_BNEP_MC_FILTER
        strcat(flt, "multicast");
#endif
 
        BT_INFO("BNEP (Ethernet Emulation) ver %s", VERSION);
        if (flt[0])
                BT_INFO("BNEP filters: %s", flt);
 
        bnep_sock_init();
        return 0;
}
 
static void __exit bnep_exit(void)
{
        bnep_sock_cleanup();
}
 
module_init(bnep_init);
module_exit(bnep_exit);
 
MODULE_AUTHOR("David Libault <david.libault@inventel.fr>, Maxim Krasnyansky <maxk@qualcomm.com>");
MODULE_DESCRIPTION("Bluetooth BNEP ver " VERSION);
MODULE_VERSION(VERSION);
MODULE_LICENSE("GPL");
MODULE_ALIAS("bt-proto-4");

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[/] [or1k_soc_on_altera_embedded_dev_kit/] [trunk/] [linux-2.6/] [linux-2.6.24/] [net/] [bluetooth/] [bnep/] [core.c] - Blame information for rev 3

Line No.	Rev	Author	Line
1	3	xianfeng	`/*`
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			`/*`
29			`* $Id: core.c,v 1.20 2002/08/04 21:23:58 maxk Exp $`
30			`*/`
31
32			`#include <linux/module.h>`
33
34			`#include <linux/kernel.h>`
35			`#include <linux/sched.h>`
36			`#include <linux/signal.h>`
37			`#include <linux/init.h>`
38			`#include <linux/wait.h>`
39			`#include <linux/freezer.h>`
40			`#include <linux/errno.h>`
41			`#include <linux/net.h>`
42			`#include <net/sock.h>`
43
44			`#include <linux/socket.h>`
45			`#include <linux/file.h>`
46
47			`#include <linux/netdevice.h>`
48			`#include <linux/etherdevice.h>`
49			`#include <linux/skbuff.h>`
50
51			`#include <asm/unaligned.h>`
52
53			`#include <net/bluetooth/bluetooth.h>`
54			`#include <net/bluetooth/hci_core.h>`
55			`#include <net/bluetooth/l2cap.h>`
56
57			`#include "bnep.h"`
58
59			`#ifndef CONFIG_BT_BNEP_DEBUG`
60			`#undef BT_DBG`
61			`#define BT_DBG(D...)`
62			`#endif`
63
64			`#define VERSION "1.2"`
65
66			`static LIST_HEAD(bnep_session_list);`
67			`static DECLARE_RWSEM(bnep_session_sem);`
68
69			`static struct bnep_session __bnep_get_session(u8 dst)`
70			`{`
71			`struct bnep_session *s;`
72			`struct list_head *p;`
73
74			`BT_DBG("");`
75
76			`list_for_each(p, &bnep_session_list) {`
77			`s = list_entry(p, struct bnep_session, list);`
78			`if (!compare_ether_addr(dst, s->eh.h_source))`
79			`return s;`
80			`}`
81			`return NULL;`
82			`}`
83
84			`static void __bnep_link_session(struct bnep_session *s)`
85			`{`
86			`/* It's safe to call __module_get() here because sessions are added`
87			`by the socket layer which has to hold the refference to this module.`
88			`*/`
89			`__module_get(THIS_MODULE);`
90			`list_add(&s->list, &bnep_session_list);`
91			`}`
92
93			`static void __bnep_unlink_session(struct bnep_session *s)`
94			`{`
95			`list_del(&s->list);`
96			`module_put(THIS_MODULE);`
97			`}`
98
99			`static int bnep_send(struct bnep_session s, void data, size_t len)`
100			`{`
101			`struct socket *sock = s->sock;`
102			`struct kvec iv = { data, len };`
103
104			`return kernel_sendmsg(sock, &s->msg, &iv, 1, len);`
105			`}`
106
107			`static int bnep_send_rsp(struct bnep_session *s, u8 ctrl, u16 resp)`
108			`{`
109			`struct bnep_control_rsp rsp;`
110			`rsp.type = BNEP_CONTROL;`
111			`rsp.ctrl = ctrl;`
112			`rsp.resp = htons(resp);`
113			`return bnep_send(s, &rsp, sizeof(rsp));`
114			`}`
115
116			`#ifdef CONFIG_BT_BNEP_PROTO_FILTER`
117			`static inline void bnep_set_default_proto_filter(struct bnep_session *s)`
118			`{`
119			`/* (IPv4, ARP) */`
120			`s->proto_filter[0].start = ETH_P_IP;`
121			`s->proto_filter[0].end = ETH_P_ARP;`
122			`/* (RARP, AppleTalk) */`
123			`s->proto_filter[1].start = ETH_P_RARP;`
124			`s->proto_filter[1].end = ETH_P_AARP;`
125			`/* (IPX, IPv6) */`
126			`s->proto_filter[2].start = ETH_P_IPX;`
127			`s->proto_filter[2].end = ETH_P_IPV6;`
128			`}`
129			`#endif`
130
131			`static int bnep_ctrl_set_netfilter(struct bnep_session s, __be16 data, int len)`
132			`{`
133			`int n;`
134
135			`if (len < 2)`
136			`return -EILSEQ;`
137
138			`n = ntohs(get_unaligned(data));`
139			`data++; len -= 2;`
140
141			`if (len < n)`
142			`return -EILSEQ;`
143
144			`BT_DBG("filter len %d", n);`
145
146			`#ifdef CONFIG_BT_BNEP_PROTO_FILTER`
147			`n /= 4;`
148			`if (n <= BNEP_MAX_PROTO_FILTERS) {`
149			`struct bnep_proto_filter *f = s->proto_filter;`
150			`int i;`
151
152			`for (i = 0; i < n; i++) {`
153			`f[i].start = ntohs(get_unaligned(data++));`
154			`f[i].end = ntohs(get_unaligned(data++));`
155
156			`BT_DBG("proto filter start %d end %d",`
157			`f[i].start, f[i].end);`
158			`}`
159
160			`if (i < BNEP_MAX_PROTO_FILTERS)`
161			`memset(f + i, 0, sizeof(*f));`
162
163			`if (n == 0)`
164			`bnep_set_default_proto_filter(s);`
165
166			`bnep_send_rsp(s, BNEP_FILTER_NET_TYPE_RSP, BNEP_SUCCESS);`
167			`} else {`
168			`bnep_send_rsp(s, BNEP_FILTER_NET_TYPE_RSP, BNEP_FILTER_LIMIT_REACHED);`
169			`}`
170			`#else`
171			`bnep_send_rsp(s, BNEP_FILTER_NET_TYPE_RSP, BNEP_FILTER_UNSUPPORTED_REQ);`
172			`#endif`
173			`return 0;`
174			`}`
175
176			`static int bnep_ctrl_set_mcfilter(struct bnep_session s, u8 data, int len)`
177			`{`
178			`int n;`
179
180			`if (len < 2)`
181			`return -EILSEQ;`
182
183			`n = ntohs(get_unaligned((__be16 *) data));`
184			`data += 2; len -= 2;`
185
186			`if (len < n)`
187			`return -EILSEQ;`
188
189			`BT_DBG("filter len %d", n);`
190
191			`#ifdef CONFIG_BT_BNEP_MC_FILTER`
192			`n /= (ETH_ALEN * 2);`
193
194			`if (n > 0) {`
195			`s->mc_filter = 0;`
196
197			`/* Always send broadcast */`
198			`set_bit(bnep_mc_hash(s->dev->broadcast), (ulong *) &s->mc_filter);`
199
200			`/* Add address ranges to the multicast hash */`
201			`for (; n > 0; n--) {`
202			`u8 a1[6], *a2;`
203
204			`memcpy(a1, data, ETH_ALEN); data += ETH_ALEN;`
205			`a2 = data; data += ETH_ALEN;`
206
207			`BT_DBG("mc filter %s -> %s",`
208			`batostr((void ) a1), batostr((void ) a2));`
209
210			`#define INCA(a) { int i = 5; while (i >=0 && ++a[i--] == 0); }`
211
212			`/* Iterate from a1 to a2 */`
213			`set_bit(bnep_mc_hash(a1), (ulong *) &s->mc_filter);`
214			`while (memcmp(a1, a2, 6) < 0 && s->mc_filter != ~0LL) {`
215			`INCA(a1);`
216			`set_bit(bnep_mc_hash(a1), (ulong *) &s->mc_filter);`
217			`}`
218			`}`
219			`}`
220
221			`BT_DBG("mc filter hash 0x%llx", s->mc_filter);`
222
223			`bnep_send_rsp(s, BNEP_FILTER_MULTI_ADDR_RSP, BNEP_SUCCESS);`
224			`#else`
225			`bnep_send_rsp(s, BNEP_FILTER_MULTI_ADDR_RSP, BNEP_FILTER_UNSUPPORTED_REQ);`
226			`#endif`
227			`return 0;`
228			`}`
229
230			`static int bnep_rx_control(struct bnep_session s, void data, int len)`
231			`{`
232			`u8 cmd = (u8 )data;`
233			`int err = 0;`
234
235			`data++; len--;`
236
237			`switch (cmd) {`
238			`case BNEP_CMD_NOT_UNDERSTOOD:`
239			`case BNEP_SETUP_CONN_REQ:`
240			`case BNEP_SETUP_CONN_RSP:`
241			`case BNEP_FILTER_NET_TYPE_RSP:`
242			`case BNEP_FILTER_MULTI_ADDR_RSP:`
243			`/* Ignore these for now */`
244			`break;`
245
246			`case BNEP_FILTER_NET_TYPE_SET:`
247			`err = bnep_ctrl_set_netfilter(s, data, len);`
248			`break;`
249
250			`case BNEP_FILTER_MULTI_ADDR_SET:`
251			`err = bnep_ctrl_set_mcfilter(s, data, len);`
252			`break;`
253
254			`default: {`
255			`u8 pkt[3];`
256			`pkt[0] = BNEP_CONTROL;`
257			`pkt[1] = BNEP_CMD_NOT_UNDERSTOOD;`
258			`pkt[2] = cmd;`
259			`bnep_send(s, pkt, sizeof(pkt));`
260			`}`
261			`break;`
262			`}`
263
264			`return err;`
265			`}`
266
267			`static int bnep_rx_extension(struct bnep_session s, struct sk_buff skb)`
268			`{`
269			`struct bnep_ext_hdr *h;`
270			`int err = 0;`
271
272			`do {`
273			`h = (void *) skb->data;`
274			`if (!skb_pull(skb, sizeof(*h))) {`
275			`err = -EILSEQ;`
276			`break;`
277			`}`
278
279			`BT_DBG("type 0x%x len %d", h->type, h->len);`
280
281			`switch (h->type & BNEP_TYPE_MASK) {`
282			`case BNEP_EXT_CONTROL:`
283			`bnep_rx_control(s, skb->data, skb->len);`
284			`break;`
285
286			`default:`
287			`/* Unknown extension, skip it. */`
288			`break;`
289			`}`
290
291			`if (!skb_pull(skb, h->len)) {`
292			`err = -EILSEQ;`
293			`break;`
294			`}`
295			`} while (!err && (h->type & BNEP_EXT_HEADER));`
296
297			`return err;`
298			`}`
299
300			`static u8 __bnep_rx_hlen[] = {`
301			`ETH_HLEN, /* BNEP_GENERAL */`
302			`0, /* BNEP_CONTROL */`
303			`2, /* BNEP_COMPRESSED */`
304			`ETH_ALEN + 2, /* BNEP_COMPRESSED_SRC_ONLY */`
305			`ETH_ALEN + 2 /* BNEP_COMPRESSED_DST_ONLY */`
306			`};`
307			`#define BNEP_RX_TYPES (sizeof(__bnep_rx_hlen) - 1)`
308
309			`static inline int bnep_rx_frame(struct bnep_session s, struct sk_buff skb)`
310			`{`
311			`struct net_device *dev = s->dev;`
312			`struct sk_buff *nskb;`
313			`u8 type;`
314
315			`dev->last_rx = jiffies;`
316			`s->stats.rx_bytes += skb->len;`
317
318			`type = (u8 ) skb->data; skb_pull(skb, 1);`
319
320			`if ((type & BNEP_TYPE_MASK) > BNEP_RX_TYPES)`
321			`goto badframe;`
322
323			`if ((type & BNEP_TYPE_MASK) == BNEP_CONTROL) {`
324			`bnep_rx_control(s, skb->data, skb->len);`
325			`kfree_skb(skb);`
326			`return 0;`
327			`}`
328
329			`skb_reset_mac_header(skb);`
330
331			`/* Verify and pull out header */`
332			`if (!skb_pull(skb, __bnep_rx_hlen[type & BNEP_TYPE_MASK]))`
333			`goto badframe;`
334
335			`s->eh.h_proto = get_unaligned((__be16 *) (skb->data - 2));`
336
337			`if (type & BNEP_EXT_HEADER) {`
338			`if (bnep_rx_extension(s, skb) < 0)`
339			`goto badframe;`
340			`}`
341
342			`/* Strip 802.1p header */`
343			`if (ntohs(s->eh.h_proto) == 0x8100) {`
344			`if (!skb_pull(skb, 4))`
345			`goto badframe;`
346			`s->eh.h_proto = get_unaligned((__be16 *) (skb->data - 2));`
347			`}`
348
349			`/* We have to alloc new skb and copy data here :(. Because original skb`
350			`* may not be modified and because of the alignment requirements. */`
351			`nskb = alloc_skb(2 + ETH_HLEN + skb->len, GFP_KERNEL);`
352			`if (!nskb) {`
353			`s->stats.rx_dropped++;`
354			`kfree_skb(skb);`
355			`return -ENOMEM;`
356			`}`
357			`skb_reserve(nskb, 2);`
358
359			`/* Decompress header and construct ether frame */`
360			`switch (type & BNEP_TYPE_MASK) {`
361			`case BNEP_COMPRESSED:`
362			`memcpy(__skb_put(nskb, ETH_HLEN), &s->eh, ETH_HLEN);`
363			`break;`
364
365			`case BNEP_COMPRESSED_SRC_ONLY:`
366			`memcpy(__skb_put(nskb, ETH_ALEN), s->eh.h_dest, ETH_ALEN);`
367			`memcpy(__skb_put(nskb, ETH_ALEN), skb_mac_header(skb), ETH_ALEN);`
368			`put_unaligned(s->eh.h_proto, (__be16 *) __skb_put(nskb, 2));`
369			`break;`
370
371			`case BNEP_COMPRESSED_DST_ONLY:`
372			`memcpy(__skb_put(nskb, ETH_ALEN), skb_mac_header(skb),`
373			`ETH_ALEN);`
374			`memcpy(__skb_put(nskb, ETH_ALEN + 2), s->eh.h_source,`
375			`ETH_ALEN + 2);`
376			`break;`
377
378			`case BNEP_GENERAL:`
379			`memcpy(__skb_put(nskb, ETH_ALEN * 2), skb_mac_header(skb),`
380			`ETH_ALEN * 2);`
381			`put_unaligned(s->eh.h_proto, (__be16 *) __skb_put(nskb, 2));`
382			`break;`
383			`}`
384
385			`skb_copy_from_linear_data(skb, __skb_put(nskb, skb->len), skb->len);`
386			`kfree_skb(skb);`
387
388			`s->stats.rx_packets++;`
389			`nskb->ip_summed = CHECKSUM_NONE;`
390			`nskb->protocol = eth_type_trans(nskb, dev);`
391			`netif_rx_ni(nskb);`
392			`return 0;`
393
394			`badframe:`
395			`s->stats.rx_errors++;`
396			`kfree_skb(skb);`
397			`return 0;`
398			`}`
399
400			`static u8 __bnep_tx_types[] = {`
401			`BNEP_GENERAL,`
402			`BNEP_COMPRESSED_SRC_ONLY,`
403			`BNEP_COMPRESSED_DST_ONLY,`
404			`BNEP_COMPRESSED`
405			`};`
406
407			`static inline int bnep_tx_frame(struct bnep_session s, struct sk_buff skb)`
408			`{`
409			`struct ethhdr eh = (void ) skb->data;`
410			`struct socket *sock = s->sock;`
411			`struct kvec iv[3];`
412			`int len = 0, il = 0;`
413			`u8 type = 0;`
414
415			`BT_DBG("skb %p dev %p type %d", skb, skb->dev, skb->pkt_type);`
416
417			`if (!skb->dev) {`
418			`/* Control frame sent by us */`
419			`goto send;`
420			`}`
421
422			`iv[il++] = (struct kvec) { &type, 1 };`
423			`len++;`
424
425			`if (!compare_ether_addr(eh->h_dest, s->eh.h_source))`
426			`type \|= 0x01;`
427
428			`if (!compare_ether_addr(eh->h_source, s->eh.h_dest))`
429			`type \|= 0x02;`
430
431			`if (type)`
432			`skb_pull(skb, ETH_ALEN * 2);`
433
434			`type = __bnep_tx_types[type];`
435			`switch (type) {`
436			`case BNEP_COMPRESSED_SRC_ONLY:`
437			`iv[il++] = (struct kvec) { eh->h_source, ETH_ALEN };`
438			`len += ETH_ALEN;`
439			`break;`
440
441			`case BNEP_COMPRESSED_DST_ONLY:`
442			`iv[il++] = (struct kvec) { eh->h_dest, ETH_ALEN };`
443			`len += ETH_ALEN;`
444			`break;`
445			`}`
446
447			`send:`
448			`iv[il++] = (struct kvec) { skb->data, skb->len };`
449			`len += skb->len;`
450
451			`/* FIXME: linearize skb */`
452			`{`
453			`len = kernel_sendmsg(sock, &s->msg, iv, il, len);`
454			`}`
455			`kfree_skb(skb);`
456
457			`if (len > 0) {`
458			`s->stats.tx_bytes += len;`
459			`s->stats.tx_packets++;`
460			`return 0;`
461			`}`
462
463			`return len;`
464			`}`
465
466			`static int bnep_session(void *arg)`
467			`{`
468			`struct bnep_session *s = arg;`
469			`struct net_device *dev = s->dev;`
470			`struct sock *sk = s->sock->sk;`
471			`struct sk_buff *skb;`
472			`wait_queue_t wait;`
473
474			`BT_DBG("");`
475
476			`daemonize("kbnepd %s", dev->name);`
477			`set_user_nice(current, -15);`
478
479			`init_waitqueue_entry(&wait, current);`
480			`add_wait_queue(sk->sk_sleep, &wait);`
481			`while (!atomic_read(&s->killed)) {`
482			`set_current_state(TASK_INTERRUPTIBLE);`
483
484			`// RX`
485			`while ((skb = skb_dequeue(&sk->sk_receive_queue))) {`
486			`skb_orphan(skb);`
487			`bnep_rx_frame(s, skb);`
488			`}`
489
490			`if (sk->sk_state != BT_CONNECTED)`
491			`break;`
492
493			`// TX`
494			`while ((skb = skb_dequeue(&sk->sk_write_queue)))`
495			`if (bnep_tx_frame(s, skb))`
496			`break;`
497			`netif_wake_queue(dev);`
498
499			`schedule();`
500			`}`
501			`set_current_state(TASK_RUNNING);`
502			`remove_wait_queue(sk->sk_sleep, &wait);`
503
504			`/* Cleanup session */`
505			`down_write(&bnep_session_sem);`
506
507			`/* Delete network device */`
508			`unregister_netdev(dev);`
509
510			`/* Release the socket */`
511			`fput(s->sock->file);`
512
513			`__bnep_unlink_session(s);`
514
515			`up_write(&bnep_session_sem);`
516			`free_netdev(dev);`
517			`return 0;`
518			`}`
519
520			`static struct device bnep_get_device(struct bnep_session session)`
521			`{`
522			`bdaddr_t *src = &bt_sk(session->sock->sk)->src;`
523			`bdaddr_t *dst = &bt_sk(session->sock->sk)->dst;`
524			`struct hci_dev *hdev;`
525			`struct hci_conn *conn;`
526
527			`hdev = hci_get_route(dst, src);`
528			`if (!hdev)`
529			`return NULL;`
530
531			`conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK, dst);`
532
533			`hci_dev_put(hdev);`
534
535			`return conn ? &conn->dev : NULL;`
536			`}`
537
538			`int bnep_add_connection(struct bnep_connadd_req req, struct socket sock)`
539			`{`
540			`struct net_device *dev;`
541			`struct bnep_session s, ss;`
542			`u8 dst[ETH_ALEN], src[ETH_ALEN];`
543			`int err;`
544
545			`BT_DBG("");`
546
547			`baswap((void *) dst, &bt_sk(sock->sk)->dst);`
548			`baswap((void *) src, &bt_sk(sock->sk)->src);`
549
550			`/* session struct allocated as private part of net_device */`
551			`dev = alloc_netdev(sizeof(struct bnep_session),`
552			`(*req->device) ? req->device : "bnep%d",`
553			`bnep_net_setup);`
554			`if (!dev)`
555			`return -ENOMEM;`
556
557			`down_write(&bnep_session_sem);`
558
559			`ss = __bnep_get_session(dst);`
560			`if (ss && ss->state == BT_CONNECTED) {`
561			`err = -EEXIST;`
562			`goto failed;`
563			`}`
564
565			`s = dev->priv;`
566
567			`/* This is rx header therefore addresses are swapped.`
568			`* ie eh.h_dest is our local address. */`
569			`memcpy(s->eh.h_dest, &src, ETH_ALEN);`
570			`memcpy(s->eh.h_source, &dst, ETH_ALEN);`
571			`memcpy(dev->dev_addr, s->eh.h_dest, ETH_ALEN);`
572
573			`s->dev = dev;`
574			`s->sock = sock;`
575			`s->role = req->role;`
576			`s->state = BT_CONNECTED;`
577
578			`s->msg.msg_flags = MSG_NOSIGNAL;`
579
580			`#ifdef CONFIG_BT_BNEP_MC_FILTER`
581			`/* Set default mc filter */`
582			`set_bit(bnep_mc_hash(dev->broadcast), (ulong *) &s->mc_filter);`
583			`#endif`
584
585			`#ifdef CONFIG_BT_BNEP_PROTO_FILTER`
586			`/* Set default protocol filter */`
587			`bnep_set_default_proto_filter(s);`
588			`#endif`
589
590			`SET_NETDEV_DEV(dev, bnep_get_device(s));`
591
592			`err = register_netdev(dev);`
593			`if (err) {`
594			`goto failed;`
595			`}`
596
597			`__bnep_link_session(s);`
598
599			`err = kernel_thread(bnep_session, s, CLONE_KERNEL);`
600			`if (err < 0) {`
601			`/* Session thread start failed, gotta cleanup. */`
602			`unregister_netdev(dev);`
603			`__bnep_unlink_session(s);`
604			`goto failed;`
605			`}`
606
607			`up_write(&bnep_session_sem);`
608			`strcpy(req->device, dev->name);`
609			`return 0;`
610
611			`failed:`
612			`up_write(&bnep_session_sem);`
613			`free_netdev(dev);`
614			`return err;`
615			`}`
616
617			`int bnep_del_connection(struct bnep_conndel_req *req)`
618			`{`
619			`struct bnep_session *s;`
620			`int err = 0;`
621
622			`BT_DBG("");`
623
624			`down_read(&bnep_session_sem);`
625
626			`s = __bnep_get_session(req->dst);`
627			`if (s) {`
628			`/* Wakeup user-space which is polling for socket errors.`
629			`* This is temporary hack untill we have shutdown in L2CAP */`
630			`s->sock->sk->sk_err = EUNATCH;`
631
632			`/* Kill session thread */`
633			`atomic_inc(&s->killed);`
634			`wake_up_interruptible(s->sock->sk->sk_sleep);`
635			`} else`
636			`err = -ENOENT;`
637
638			`up_read(&bnep_session_sem);`
639			`return err;`
640			`}`
641
642			`static void __bnep_copy_ci(struct bnep_conninfo ci, struct bnep_session s)`
643			`{`
644			`memcpy(ci->dst, s->eh.h_source, ETH_ALEN);`
645			`strcpy(ci->device, s->dev->name);`
646			`ci->flags = s->flags;`
647			`ci->state = s->state;`
648			`ci->role = s->role;`
649			`}`
650
651			`int bnep_get_connlist(struct bnep_connlist_req *req)`
652			`{`
653			`struct list_head *p;`
654			`int err = 0, n = 0;`
655
656			`down_read(&bnep_session_sem);`
657
658			`list_for_each(p, &bnep_session_list) {`
659			`struct bnep_session *s;`
660			`struct bnep_conninfo ci;`
661
662			`s = list_entry(p, struct bnep_session, list);`
663
664			`__bnep_copy_ci(&ci, s);`
665
666			`if (copy_to_user(req->ci, &ci, sizeof(ci))) {`
667			`err = -EFAULT;`
668			`break;`
669			`}`
670
671			`if (++n >= req->cnum)`
672			`break;`
673
674			`req->ci++;`
675			`}`
676			`req->cnum = n;`
677
678			`up_read(&bnep_session_sem);`
679			`return err;`
680			`}`
681
682			`int bnep_get_conninfo(struct bnep_conninfo *ci)`
683			`{`
684			`struct bnep_session *s;`
685			`int err = 0;`
686
687			`down_read(&bnep_session_sem);`
688
689			`s = __bnep_get_session(ci->dst);`
690			`if (s)`
691			`__bnep_copy_ci(ci, s);`
692			`else`
693			`err = -ENOENT;`
694
695			`up_read(&bnep_session_sem);`
696			`return err;`
697			`}`
698
699			`static int __init bnep_init(void)`
700			`{`
701			`char flt[50] = "";`
702
703			`l2cap_load();`
704
705			`#ifdef CONFIG_BT_BNEP_PROTO_FILTER`
706			`strcat(flt, "protocol ");`
707			`#endif`
708
709			`#ifdef CONFIG_BT_BNEP_MC_FILTER`
710			`strcat(flt, "multicast");`
711			`#endif`
712
713			`BT_INFO("BNEP (Ethernet Emulation) ver %s", VERSION);`
714			`if (flt[0])`
715			`BT_INFO("BNEP filters: %s", flt);`
716
717			`bnep_sock_init();`
718			`return 0;`
719			`}`
720
721			`static void __exit bnep_exit(void)`
722			`{`
723			`bnep_sock_cleanup();`
724			`}`
725
726			`module_init(bnep_init);`
727			`module_exit(bnep_exit);`
728
729			`MODULE_AUTHOR("David Libault <david.libault@inventel.fr>, Maxim Krasnyansky <maxk@qualcomm.com>");`
730			`MODULE_DESCRIPTION("Bluetooth BNEP ver " VERSION);`
731			`MODULE_VERSION(VERSION);`
732			`MODULE_LICENSE("GPL");`
733			`MODULE_ALIAS("bt-proto-4");`