1 /*
2 BNEP implementation for Linux Bluetooth stack (BlueZ).
3 Copyright (C) 2001-2002 Inventel Systemes
4 Written 2001-2002 by
5 Clément Moreau <clement.moreau@inventel.fr>
6 David Libault <david.libault@inventel.fr>
7
8 Copyright (C) 2002 Maxim Krasnyansky <maxk@qualcomm.com>
9
10 This program is free software; you can redistribute it and/or modify
11 it under the terms of the GNU General Public License version 2 as
12 published by the Free Software Foundation;
13
14 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
15 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
17 IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
18 CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
19 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
20 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
21 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
22
23 ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
24 COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
25 SOFTWARE IS DISCLAIMED.
26 */
27
28 /*
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");
734
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