2 BNEP implementation for Linux Bluetooth stack (BlueZ).
3 Copyright (C) 2001-2002 Inventel Systemes
5 Clément Moreau <clement.moreau@inventel.fr>
6 David Libault <david.libault@inventel.fr>
8 Copyright (C) 2002 Maxim Krasnyansky <maxk@qualcomm.com>
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;
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.
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.
29 * $Id: core.c,v 1.20 2002/08/04 21:23:58 maxk Exp $
32 #include <linux/module.h>
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/errno.h>
40 #include <linux/smp_lock.h>
41 #include <linux/net.h>
44 #include <linux/socket.h>
45 #include <linux/file.h>
47 #include <linux/netdevice.h>
48 #include <linux/etherdevice.h>
49 #include <linux/skbuff.h>
51 #include <asm/unaligned.h>
53 #include <net/bluetooth/bluetooth.h>
54 #include <net/bluetooth/hci_core.h>
55 #include <net/bluetooth/l2cap.h>
59 #ifndef CONFIG_BT_BNEP_DEBUG
66 static LIST_HEAD(bnep_session_list
);
67 static DECLARE_RWSEM(bnep_session_sem
);
69 static struct bnep_session
*__bnep_get_session(u8
*dst
)
71 struct bnep_session
*s
;
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
))
84 static void __bnep_link_session(struct bnep_session
*s
)
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.
89 __module_get(THIS_MODULE
);
90 list_add(&s
->list
, &bnep_session_list
);
93 static void __bnep_unlink_session(struct bnep_session
*s
)
96 module_put(THIS_MODULE
);
99 static int bnep_send(struct bnep_session
*s
, void *data
, size_t len
)
101 struct socket
*sock
= s
->sock
;
102 struct kvec iv
= { data
, len
};
104 return kernel_sendmsg(sock
, &s
->msg
, &iv
, 1, len
);
107 static int bnep_send_rsp(struct bnep_session
*s
, u8 ctrl
, u16 resp
)
109 struct bnep_control_rsp rsp
;
110 rsp
.type
= BNEP_CONTROL
;
112 rsp
.resp
= htons(resp
);
113 return bnep_send(s
, &rsp
, sizeof(rsp
));
116 #ifdef CONFIG_BT_BNEP_PROTO_FILTER
117 static inline void bnep_set_default_proto_filter(struct bnep_session
*s
)
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
;
126 s
->proto_filter
[2].start
= ETH_P_IPX
;
127 s
->proto_filter
[2].end
= ETH_P_IPV6
;
131 static int bnep_ctrl_set_netfilter(struct bnep_session
*s
, __be16
*data
, int len
)
138 n
= ntohs(get_unaligned(data
));
144 BT_DBG("filter len %d", n
);
146 #ifdef CONFIG_BT_BNEP_PROTO_FILTER
148 if (n
<= BNEP_MAX_PROTO_FILTERS
) {
149 struct bnep_proto_filter
*f
= s
->proto_filter
;
152 for (i
= 0; i
< n
; i
++) {
153 f
[i
].start
= ntohs(get_unaligned(data
++));
154 f
[i
].end
= ntohs(get_unaligned(data
++));
156 BT_DBG("proto filter start %d end %d",
157 f
[i
].start
, f
[i
].end
);
160 if (i
< BNEP_MAX_PROTO_FILTERS
)
161 memset(f
+ i
, 0, sizeof(*f
));
164 bnep_set_default_proto_filter(s
);
166 bnep_send_rsp(s
, BNEP_FILTER_NET_TYPE_RSP
, BNEP_SUCCESS
);
168 bnep_send_rsp(s
, BNEP_FILTER_NET_TYPE_RSP
, BNEP_FILTER_LIMIT_REACHED
);
171 bnep_send_rsp(s
, BNEP_FILTER_NET_TYPE_RSP
, BNEP_FILTER_UNSUPPORTED_REQ
);
176 static int bnep_ctrl_set_mcfilter(struct bnep_session
*s
, u8
*data
, int len
)
183 n
= ntohs(get_unaligned((__be16
*) data
));
189 BT_DBG("filter len %d", n
);
191 #ifdef CONFIG_BT_BNEP_MC_FILTER
197 /* Always send broadcast */
198 set_bit(bnep_mc_hash(s
->dev
->broadcast
), (ulong
*) &s
->mc_filter
);
200 /* Add address ranges to the multicast hash */
204 memcpy(a1
, data
, ETH_ALEN
); data
+= ETH_ALEN
;
205 a2
= data
; data
+= ETH_ALEN
;
207 BT_DBG("mc filter %s -> %s",
208 batostr((void *) a1
), batostr((void *) a2
));
210 #define INCA(a) { int i = 5; while (i >=0 && ++a[i--] == 0); }
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) {
216 set_bit(bnep_mc_hash(a1
), (ulong
*) &s
->mc_filter
);
221 BT_DBG("mc filter hash 0x%llx", s
->mc_filter
);
223 bnep_send_rsp(s
, BNEP_FILTER_MULTI_ADDR_RSP
, BNEP_SUCCESS
);
225 bnep_send_rsp(s
, BNEP_FILTER_MULTI_ADDR_RSP
, BNEP_FILTER_UNSUPPORTED_REQ
);
230 static int bnep_rx_control(struct bnep_session
*s
, void *data
, int len
)
232 u8 cmd
= *(u8
*)data
;
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 */
246 case BNEP_FILTER_NET_TYPE_SET
:
247 err
= bnep_ctrl_set_netfilter(s
, data
, len
);
250 case BNEP_FILTER_MULTI_ADDR_SET
:
251 err
= bnep_ctrl_set_mcfilter(s
, data
, len
);
256 pkt
[0] = BNEP_CONTROL
;
257 pkt
[1] = BNEP_CMD_NOT_UNDERSTOOD
;
259 bnep_send(s
, pkt
, sizeof(pkt
));
267 static int bnep_rx_extension(struct bnep_session
*s
, struct sk_buff
*skb
)
269 struct bnep_ext_hdr
*h
;
273 h
= (void *) skb
->data
;
274 if (!skb_pull(skb
, sizeof(*h
))) {
279 BT_DBG("type 0x%x len %d", h
->type
, h
->len
);
281 switch (h
->type
& BNEP_TYPE_MASK
) {
282 case BNEP_EXT_CONTROL
:
283 bnep_rx_control(s
, skb
->data
, skb
->len
);
287 /* Unknown extension, skip it. */
291 if (!skb_pull(skb
, h
->len
)) {
295 } while (!err
&& (h
->type
& BNEP_EXT_HEADER
));
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 */
307 #define BNEP_RX_TYPES (sizeof(__bnep_rx_hlen) - 1)
309 static inline int bnep_rx_frame(struct bnep_session
*s
, struct sk_buff
*skb
)
311 struct net_device
*dev
= s
->dev
;
312 struct sk_buff
*nskb
;
315 dev
->last_rx
= jiffies
;
316 s
->stats
.rx_bytes
+= skb
->len
;
318 type
= *(u8
*) skb
->data
; skb_pull(skb
, 1);
320 if ((type
& BNEP_TYPE_MASK
) > BNEP_RX_TYPES
)
323 if ((type
& BNEP_TYPE_MASK
) == BNEP_CONTROL
) {
324 bnep_rx_control(s
, skb
->data
, skb
->len
);
329 skb_reset_mac_header(skb
);
331 /* Verify and pull out header */
332 if (!skb_pull(skb
, __bnep_rx_hlen
[type
& BNEP_TYPE_MASK
]))
335 s
->eh
.h_proto
= get_unaligned((__be16
*) (skb
->data
- 2));
337 if (type
& BNEP_EXT_HEADER
) {
338 if (bnep_rx_extension(s
, skb
) < 0)
342 /* Strip 802.1p header */
343 if (ntohs(s
->eh
.h_proto
) == 0x8100) {
344 if (!skb_pull(skb
, 4))
346 s
->eh
.h_proto
= get_unaligned((__be16
*) (skb
->data
- 2));
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
);
353 s
->stats
.rx_dropped
++;
357 skb_reserve(nskb
, 2);
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
);
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
.raw
, ETH_ALEN
);
368 put_unaligned(s
->eh
.h_proto
, (__be16
*) __skb_put(nskb
, 2));
371 case BNEP_COMPRESSED_DST_ONLY
:
372 memcpy(__skb_put(nskb
, ETH_ALEN
), skb
->mac
.raw
, ETH_ALEN
);
373 memcpy(__skb_put(nskb
, ETH_ALEN
+ 2), s
->eh
.h_source
, ETH_ALEN
+ 2);
377 memcpy(__skb_put(nskb
, ETH_ALEN
* 2), skb
->mac
.raw
, ETH_ALEN
* 2);
378 put_unaligned(s
->eh
.h_proto
, (__be16
*) __skb_put(nskb
, 2));
382 memcpy(__skb_put(nskb
, skb
->len
), skb
->data
, skb
->len
);
385 s
->stats
.rx_packets
++;
386 nskb
->ip_summed
= CHECKSUM_NONE
;
387 nskb
->protocol
= eth_type_trans(nskb
, dev
);
392 s
->stats
.rx_errors
++;
397 static u8 __bnep_tx_types
[] = {
399 BNEP_COMPRESSED_SRC_ONLY
,
400 BNEP_COMPRESSED_DST_ONLY
,
404 static inline int bnep_tx_frame(struct bnep_session
*s
, struct sk_buff
*skb
)
406 struct ethhdr
*eh
= (void *) skb
->data
;
407 struct socket
*sock
= s
->sock
;
412 BT_DBG("skb %p dev %p type %d", skb
, skb
->dev
, skb
->pkt_type
);
415 /* Control frame sent by us */
419 iv
[il
++] = (struct kvec
) { &type
, 1 };
422 if (!compare_ether_addr(eh
->h_dest
, s
->eh
.h_source
))
425 if (!compare_ether_addr(eh
->h_source
, s
->eh
.h_dest
))
429 skb_pull(skb
, ETH_ALEN
* 2);
431 type
= __bnep_tx_types
[type
];
433 case BNEP_COMPRESSED_SRC_ONLY
:
434 iv
[il
++] = (struct kvec
) { eh
->h_source
, ETH_ALEN
};
438 case BNEP_COMPRESSED_DST_ONLY
:
439 iv
[il
++] = (struct kvec
) { eh
->h_dest
, ETH_ALEN
};
445 iv
[il
++] = (struct kvec
) { skb
->data
, skb
->len
};
448 /* FIXME: linearize skb */
450 len
= kernel_sendmsg(sock
, &s
->msg
, iv
, il
, len
);
455 s
->stats
.tx_bytes
+= len
;
456 s
->stats
.tx_packets
++;
463 static int bnep_session(void *arg
)
465 struct bnep_session
*s
= arg
;
466 struct net_device
*dev
= s
->dev
;
467 struct sock
*sk
= s
->sock
->sk
;
473 daemonize("kbnepd %s", dev
->name
);
474 set_user_nice(current
, -15);
475 current
->flags
|= PF_NOFREEZE
;
477 init_waitqueue_entry(&wait
, current
);
478 add_wait_queue(sk
->sk_sleep
, &wait
);
479 while (!atomic_read(&s
->killed
)) {
480 set_current_state(TASK_INTERRUPTIBLE
);
483 while ((skb
= skb_dequeue(&sk
->sk_receive_queue
))) {
485 bnep_rx_frame(s
, skb
);
488 if (sk
->sk_state
!= BT_CONNECTED
)
492 while ((skb
= skb_dequeue(&sk
->sk_write_queue
)))
493 if (bnep_tx_frame(s
, skb
))
495 netif_wake_queue(dev
);
499 set_current_state(TASK_RUNNING
);
500 remove_wait_queue(sk
->sk_sleep
, &wait
);
502 /* Cleanup session */
503 down_write(&bnep_session_sem
);
505 /* Delete network device */
506 unregister_netdev(dev
);
508 /* Release the socket */
511 __bnep_unlink_session(s
);
513 up_write(&bnep_session_sem
);
518 static struct device
*bnep_get_device(struct bnep_session
*session
)
520 bdaddr_t
*src
= &bt_sk(session
->sock
->sk
)->src
;
521 bdaddr_t
*dst
= &bt_sk(session
->sock
->sk
)->dst
;
522 struct hci_dev
*hdev
;
523 struct hci_conn
*conn
;
525 hdev
= hci_get_route(dst
, src
);
529 conn
= hci_conn_hash_lookup_ba(hdev
, ACL_LINK
, dst
);
533 return conn
? &conn
->dev
: NULL
;
536 int bnep_add_connection(struct bnep_connadd_req
*req
, struct socket
*sock
)
538 struct net_device
*dev
;
539 struct bnep_session
*s
, *ss
;
540 u8 dst
[ETH_ALEN
], src
[ETH_ALEN
];
545 baswap((void *) dst
, &bt_sk(sock
->sk
)->dst
);
546 baswap((void *) src
, &bt_sk(sock
->sk
)->src
);
548 /* session struct allocated as private part of net_device */
549 dev
= alloc_netdev(sizeof(struct bnep_session
),
550 (*req
->device
) ? req
->device
: "bnep%d",
555 down_write(&bnep_session_sem
);
557 ss
= __bnep_get_session(dst
);
558 if (ss
&& ss
->state
== BT_CONNECTED
) {
565 /* This is rx header therefore addresses are swapped.
566 * ie eh.h_dest is our local address. */
567 memcpy(s
->eh
.h_dest
, &src
, ETH_ALEN
);
568 memcpy(s
->eh
.h_source
, &dst
, ETH_ALEN
);
569 memcpy(dev
->dev_addr
, s
->eh
.h_dest
, ETH_ALEN
);
574 s
->state
= BT_CONNECTED
;
576 s
->msg
.msg_flags
= MSG_NOSIGNAL
;
578 #ifdef CONFIG_BT_BNEP_MC_FILTER
579 /* Set default mc filter */
580 set_bit(bnep_mc_hash(dev
->broadcast
), (ulong
*) &s
->mc_filter
);
583 #ifdef CONFIG_BT_BNEP_PROTO_FILTER
584 /* Set default protocol filter */
585 bnep_set_default_proto_filter(s
);
588 SET_NETDEV_DEV(dev
, bnep_get_device(s
));
590 err
= register_netdev(dev
);
595 __bnep_link_session(s
);
597 err
= kernel_thread(bnep_session
, s
, CLONE_KERNEL
);
599 /* Session thread start failed, gotta cleanup. */
600 unregister_netdev(dev
);
601 __bnep_unlink_session(s
);
605 up_write(&bnep_session_sem
);
606 strcpy(req
->device
, dev
->name
);
610 up_write(&bnep_session_sem
);
615 int bnep_del_connection(struct bnep_conndel_req
*req
)
617 struct bnep_session
*s
;
622 down_read(&bnep_session_sem
);
624 s
= __bnep_get_session(req
->dst
);
626 /* Wakeup user-space which is polling for socket errors.
627 * This is temporary hack untill we have shutdown in L2CAP */
628 s
->sock
->sk
->sk_err
= EUNATCH
;
630 /* Kill session thread */
631 atomic_inc(&s
->killed
);
632 wake_up_interruptible(s
->sock
->sk
->sk_sleep
);
636 up_read(&bnep_session_sem
);
640 static void __bnep_copy_ci(struct bnep_conninfo
*ci
, struct bnep_session
*s
)
642 memcpy(ci
->dst
, s
->eh
.h_source
, ETH_ALEN
);
643 strcpy(ci
->device
, s
->dev
->name
);
644 ci
->flags
= s
->flags
;
645 ci
->state
= s
->state
;
649 int bnep_get_connlist(struct bnep_connlist_req
*req
)
654 down_read(&bnep_session_sem
);
656 list_for_each(p
, &bnep_session_list
) {
657 struct bnep_session
*s
;
658 struct bnep_conninfo ci
;
660 s
= list_entry(p
, struct bnep_session
, list
);
662 __bnep_copy_ci(&ci
, s
);
664 if (copy_to_user(req
->ci
, &ci
, sizeof(ci
))) {
669 if (++n
>= req
->cnum
)
676 up_read(&bnep_session_sem
);
680 int bnep_get_conninfo(struct bnep_conninfo
*ci
)
682 struct bnep_session
*s
;
685 down_read(&bnep_session_sem
);
687 s
= __bnep_get_session(ci
->dst
);
689 __bnep_copy_ci(ci
, s
);
693 up_read(&bnep_session_sem
);
697 static int __init
bnep_init(void)
703 #ifdef CONFIG_BT_BNEP_PROTO_FILTER
704 strcat(flt
, "protocol ");
707 #ifdef CONFIG_BT_BNEP_MC_FILTER
708 strcat(flt
, "multicast");
711 BT_INFO("BNEP (Ethernet Emulation) ver %s", VERSION
);
713 BT_INFO("BNEP filters: %s", flt
);
719 static void __exit
bnep_exit(void)
724 module_init(bnep_init
);
725 module_exit(bnep_exit
);
727 MODULE_AUTHOR("David Libault <david.libault@inventel.fr>, Maxim Krasnyansky <maxk@qualcomm.com>");
728 MODULE_DESCRIPTION("Bluetooth BNEP ver " VERSION
);
729 MODULE_VERSION(VERSION
);
730 MODULE_LICENSE("GPL");
731 MODULE_ALIAS("bt-proto-4");