![Marcel Holtmann](/assets/img/avatar_default.png)
When the connection lookup for the device structure fails, the reference count for the HCI device needs to be decremented. Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
733 lines
16 KiB
C
733 lines
16 KiB
C
/*
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BNEP implementation for Linux Bluetooth stack (BlueZ).
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Copyright (C) 2001-2002 Inventel Systemes
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Written 2001-2002 by
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Clément Moreau <clement.moreau@inventel.fr>
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David Libault <david.libault@inventel.fr>
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Copyright (C) 2002 Maxim Krasnyansky <maxk@qualcomm.com>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License version 2 as
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published by the Free Software Foundation;
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
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IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
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CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
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COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
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SOFTWARE IS DISCLAIMED.
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*/
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/*
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* $Id: core.c,v 1.20 2002/08/04 21:23:58 maxk Exp $
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/signal.h>
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#include <linux/init.h>
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#include <linux/wait.h>
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#include <linux/errno.h>
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#include <linux/smp_lock.h>
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#include <linux/net.h>
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#include <net/sock.h>
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#include <linux/socket.h>
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#include <linux/file.h>
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#include <linux/netdevice.h>
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#include <linux/etherdevice.h>
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#include <linux/skbuff.h>
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#include <asm/unaligned.h>
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#include <net/bluetooth/bluetooth.h>
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#include <net/bluetooth/hci_core.h>
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#include <net/bluetooth/l2cap.h>
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#include "bnep.h"
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#ifndef CONFIG_BT_BNEP_DEBUG
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#undef BT_DBG
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#define BT_DBG(D...)
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#endif
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#define VERSION "1.2"
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static LIST_HEAD(bnep_session_list);
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static DECLARE_RWSEM(bnep_session_sem);
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static struct bnep_session *__bnep_get_session(u8 *dst)
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{
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struct bnep_session *s;
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struct list_head *p;
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BT_DBG("");
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list_for_each(p, &bnep_session_list) {
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s = list_entry(p, struct bnep_session, list);
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if (!compare_ether_addr(dst, s->eh.h_source))
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return s;
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}
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return NULL;
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}
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static void __bnep_link_session(struct bnep_session *s)
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{
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/* It's safe to call __module_get() here because sessions are added
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by the socket layer which has to hold the refference to this module.
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*/
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__module_get(THIS_MODULE);
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list_add(&s->list, &bnep_session_list);
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}
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static void __bnep_unlink_session(struct bnep_session *s)
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{
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list_del(&s->list);
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module_put(THIS_MODULE);
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}
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static int bnep_send(struct bnep_session *s, void *data, size_t len)
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{
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struct socket *sock = s->sock;
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struct kvec iv = { data, len };
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return kernel_sendmsg(sock, &s->msg, &iv, 1, len);
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}
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static int bnep_send_rsp(struct bnep_session *s, u8 ctrl, u16 resp)
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{
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struct bnep_control_rsp rsp;
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rsp.type = BNEP_CONTROL;
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rsp.ctrl = ctrl;
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rsp.resp = htons(resp);
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return bnep_send(s, &rsp, sizeof(rsp));
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}
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#ifdef CONFIG_BT_BNEP_PROTO_FILTER
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static inline void bnep_set_default_proto_filter(struct bnep_session *s)
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{
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/* (IPv4, ARP) */
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s->proto_filter[0].start = htons(0x0800);
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s->proto_filter[0].end = htons(0x0806);
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/* (RARP, AppleTalk) */
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s->proto_filter[1].start = htons(0x8035);
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s->proto_filter[1].end = htons(0x80F3);
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/* (IPX, IPv6) */
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s->proto_filter[2].start = htons(0x8137);
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s->proto_filter[2].end = htons(0x86DD);
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}
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#endif
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static int bnep_ctrl_set_netfilter(struct bnep_session *s, u16 *data, int len)
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{
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int n;
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if (len < 2)
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return -EILSEQ;
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n = ntohs(get_unaligned(data));
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data++; len -= 2;
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if (len < n)
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return -EILSEQ;
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BT_DBG("filter len %d", n);
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#ifdef CONFIG_BT_BNEP_PROTO_FILTER
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n /= 4;
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if (n <= BNEP_MAX_PROTO_FILTERS) {
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struct bnep_proto_filter *f = s->proto_filter;
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int i;
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for (i = 0; i < n; i++) {
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f[i].start = get_unaligned(data++);
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f[i].end = get_unaligned(data++);
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BT_DBG("proto filter start %d end %d",
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f[i].start, f[i].end);
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}
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if (i < BNEP_MAX_PROTO_FILTERS)
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memset(f + i, 0, sizeof(*f));
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if (n == 0)
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bnep_set_default_proto_filter(s);
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bnep_send_rsp(s, BNEP_FILTER_NET_TYPE_RSP, BNEP_SUCCESS);
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} else {
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bnep_send_rsp(s, BNEP_FILTER_NET_TYPE_RSP, BNEP_FILTER_LIMIT_REACHED);
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}
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#else
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bnep_send_rsp(s, BNEP_FILTER_NET_TYPE_RSP, BNEP_FILTER_UNSUPPORTED_REQ);
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#endif
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return 0;
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}
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static int bnep_ctrl_set_mcfilter(struct bnep_session *s, u8 *data, int len)
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{
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int n;
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if (len < 2)
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return -EILSEQ;
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n = ntohs(get_unaligned((u16 *) data));
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data += 2; len -= 2;
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if (len < n)
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return -EILSEQ;
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BT_DBG("filter len %d", n);
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#ifdef CONFIG_BT_BNEP_MC_FILTER
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n /= (ETH_ALEN * 2);
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if (n > 0) {
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s->mc_filter = 0;
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/* Always send broadcast */
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set_bit(bnep_mc_hash(s->dev->broadcast), (ulong *) &s->mc_filter);
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/* Add address ranges to the multicast hash */
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for (; n > 0; n--) {
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u8 a1[6], *a2;
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memcpy(a1, data, ETH_ALEN); data += ETH_ALEN;
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a2 = data; data += ETH_ALEN;
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BT_DBG("mc filter %s -> %s",
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batostr((void *) a1), batostr((void *) a2));
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#define INCA(a) { int i = 5; while (i >=0 && ++a[i--] == 0); }
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/* Iterate from a1 to a2 */
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set_bit(bnep_mc_hash(a1), (ulong *) &s->mc_filter);
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while (memcmp(a1, a2, 6) < 0 && s->mc_filter != ~0LL) {
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INCA(a1);
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set_bit(bnep_mc_hash(a1), (ulong *) &s->mc_filter);
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}
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}
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}
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BT_DBG("mc filter hash 0x%llx", s->mc_filter);
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bnep_send_rsp(s, BNEP_FILTER_MULTI_ADDR_RSP, BNEP_SUCCESS);
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#else
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bnep_send_rsp(s, BNEP_FILTER_MULTI_ADDR_RSP, BNEP_FILTER_UNSUPPORTED_REQ);
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#endif
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return 0;
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}
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static int bnep_rx_control(struct bnep_session *s, void *data, int len)
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{
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u8 cmd = *(u8 *)data;
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int err = 0;
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data++; len--;
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switch (cmd) {
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case BNEP_CMD_NOT_UNDERSTOOD:
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case BNEP_SETUP_CONN_REQ:
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case BNEP_SETUP_CONN_RSP:
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case BNEP_FILTER_NET_TYPE_RSP:
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case BNEP_FILTER_MULTI_ADDR_RSP:
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/* Ignore these for now */
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break;
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case BNEP_FILTER_NET_TYPE_SET:
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err = bnep_ctrl_set_netfilter(s, data, len);
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break;
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case BNEP_FILTER_MULTI_ADDR_SET:
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err = bnep_ctrl_set_mcfilter(s, data, len);
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break;
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default: {
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u8 pkt[3];
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pkt[0] = BNEP_CONTROL;
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pkt[1] = BNEP_CMD_NOT_UNDERSTOOD;
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pkt[2] = cmd;
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bnep_send(s, pkt, sizeof(pkt));
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}
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break;
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}
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return err;
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}
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static int bnep_rx_extension(struct bnep_session *s, struct sk_buff *skb)
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{
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struct bnep_ext_hdr *h;
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int err = 0;
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do {
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h = (void *) skb->data;
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if (!skb_pull(skb, sizeof(*h))) {
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err = -EILSEQ;
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break;
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}
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BT_DBG("type 0x%x len %d", h->type, h->len);
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switch (h->type & BNEP_TYPE_MASK) {
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case BNEP_EXT_CONTROL:
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bnep_rx_control(s, skb->data, skb->len);
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break;
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default:
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/* Unknown extension, skip it. */
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break;
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}
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if (!skb_pull(skb, h->len)) {
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err = -EILSEQ;
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break;
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}
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} while (!err && (h->type & BNEP_EXT_HEADER));
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return err;
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}
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static u8 __bnep_rx_hlen[] = {
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ETH_HLEN, /* BNEP_GENERAL */
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0, /* BNEP_CONTROL */
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2, /* BNEP_COMPRESSED */
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ETH_ALEN + 2, /* BNEP_COMPRESSED_SRC_ONLY */
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ETH_ALEN + 2 /* BNEP_COMPRESSED_DST_ONLY */
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};
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#define BNEP_RX_TYPES (sizeof(__bnep_rx_hlen) - 1)
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static inline int bnep_rx_frame(struct bnep_session *s, struct sk_buff *skb)
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{
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struct net_device *dev = s->dev;
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struct sk_buff *nskb;
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u8 type;
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dev->last_rx = jiffies;
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s->stats.rx_bytes += skb->len;
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type = *(u8 *) skb->data; skb_pull(skb, 1);
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if ((type & BNEP_TYPE_MASK) > BNEP_RX_TYPES)
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goto badframe;
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if ((type & BNEP_TYPE_MASK) == BNEP_CONTROL) {
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bnep_rx_control(s, skb->data, skb->len);
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kfree_skb(skb);
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return 0;
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}
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skb->mac.raw = skb->data;
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/* Verify and pull out header */
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if (!skb_pull(skb, __bnep_rx_hlen[type & BNEP_TYPE_MASK]))
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goto badframe;
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s->eh.h_proto = get_unaligned((u16 *) (skb->data - 2));
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if (type & BNEP_EXT_HEADER) {
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if (bnep_rx_extension(s, skb) < 0)
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goto badframe;
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}
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/* Strip 802.1p header */
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if (ntohs(s->eh.h_proto) == 0x8100) {
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if (!skb_pull(skb, 4))
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goto badframe;
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s->eh.h_proto = get_unaligned((u16 *) (skb->data - 2));
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}
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/* We have to alloc new skb and copy data here :(. Because original skb
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* may not be modified and because of the alignment requirements. */
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nskb = alloc_skb(2 + ETH_HLEN + skb->len, GFP_KERNEL);
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if (!nskb) {
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s->stats.rx_dropped++;
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kfree_skb(skb);
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return -ENOMEM;
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}
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skb_reserve(nskb, 2);
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/* Decompress header and construct ether frame */
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switch (type & BNEP_TYPE_MASK) {
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case BNEP_COMPRESSED:
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memcpy(__skb_put(nskb, ETH_HLEN), &s->eh, ETH_HLEN);
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break;
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case BNEP_COMPRESSED_SRC_ONLY:
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memcpy(__skb_put(nskb, ETH_ALEN), s->eh.h_dest, ETH_ALEN);
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memcpy(__skb_put(nskb, ETH_ALEN), skb->mac.raw, ETH_ALEN);
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put_unaligned(s->eh.h_proto, (u16 *) __skb_put(nskb, 2));
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break;
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case BNEP_COMPRESSED_DST_ONLY:
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memcpy(__skb_put(nskb, ETH_ALEN), skb->mac.raw, ETH_ALEN);
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memcpy(__skb_put(nskb, ETH_ALEN + 2), s->eh.h_source, ETH_ALEN + 2);
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break;
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case BNEP_GENERAL:
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memcpy(__skb_put(nskb, ETH_ALEN * 2), skb->mac.raw, ETH_ALEN * 2);
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put_unaligned(s->eh.h_proto, (u16 *) __skb_put(nskb, 2));
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break;
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}
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memcpy(__skb_put(nskb, skb->len), skb->data, skb->len);
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kfree_skb(skb);
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s->stats.rx_packets++;
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nskb->dev = dev;
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nskb->ip_summed = CHECKSUM_NONE;
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nskb->protocol = eth_type_trans(nskb, dev);
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netif_rx_ni(nskb);
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return 0;
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badframe:
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s->stats.rx_errors++;
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kfree_skb(skb);
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return 0;
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}
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static u8 __bnep_tx_types[] = {
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BNEP_GENERAL,
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BNEP_COMPRESSED_SRC_ONLY,
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BNEP_COMPRESSED_DST_ONLY,
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BNEP_COMPRESSED
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};
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static inline int bnep_tx_frame(struct bnep_session *s, struct sk_buff *skb)
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{
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struct ethhdr *eh = (void *) skb->data;
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struct socket *sock = s->sock;
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struct kvec iv[3];
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int len = 0, il = 0;
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u8 type = 0;
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BT_DBG("skb %p dev %p type %d", skb, skb->dev, skb->pkt_type);
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|
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if (!skb->dev) {
|
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/* Control frame sent by us */
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goto send;
|
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}
|
|
|
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iv[il++] = (struct kvec) { &type, 1 };
|
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len++;
|
|
|
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if (!compare_ether_addr(eh->h_dest, s->eh.h_source))
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type |= 0x01;
|
|
|
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if (!compare_ether_addr(eh->h_source, s->eh.h_dest))
|
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type |= 0x02;
|
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|
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if (type)
|
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skb_pull(skb, ETH_ALEN * 2);
|
|
|
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type = __bnep_tx_types[type];
|
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switch (type) {
|
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case BNEP_COMPRESSED_SRC_ONLY:
|
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iv[il++] = (struct kvec) { eh->h_source, ETH_ALEN };
|
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len += ETH_ALEN;
|
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break;
|
|
|
|
case BNEP_COMPRESSED_DST_ONLY:
|
|
iv[il++] = (struct kvec) { eh->h_dest, ETH_ALEN };
|
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len += ETH_ALEN;
|
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break;
|
|
}
|
|
|
|
send:
|
|
iv[il++] = (struct kvec) { skb->data, skb->len };
|
|
len += skb->len;
|
|
|
|
/* FIXME: linearize skb */
|
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{
|
|
len = kernel_sendmsg(sock, &s->msg, iv, il, len);
|
|
}
|
|
kfree_skb(skb);
|
|
|
|
if (len > 0) {
|
|
s->stats.tx_bytes += len;
|
|
s->stats.tx_packets++;
|
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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);
|
|
current->flags |= PF_NOFREEZE;
|
|
|
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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");
|