3 * l1oip.c low level driver for tunneling layer 1 over IP
5 * NOTE: It is not compatible with TDMoIP nor "ISDN over IP".
7 * Author Andreas Eversberg (jolly@eversberg.eu)
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2, or (at your option)
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
29 Value 3 = BRI (multi channel frame, not supported yet)
30 Value 4 = PRI (multi channel frame, not supported yet)
31 A multi channel frame reduces overhead to a single frame for all
32 b-channels, but increases delay.
33 (NOTE: Multi channel frames are not implemented yet.)
36 Value 0 = transparent (default)
37 Value 1 = transfer ALAW
38 Value 2 = transfer ULAW
39 Value 3 = transfer generic 4 bit compression.
42 0 = we use a-Law (default)
46 limitation of B-channels to control bandwidth (1...126)
48 PRI: 1-30, 31-126 (126, because dchannel ist not counted here)
49 Also limited ressources are used for stack, resulting in less channels.
50 It is possible to have more channels than 30 in PRI mode, this must
51 be supported by the application.
54 byte representation of remote ip address (127.0.0.1 -> 127,0,0,1)
55 If not given or four 0, no remote address is set.
56 For multiple interfaces, concat ip addresses. (127,0,0,1,127,0,0,1)
59 port number (local interface)
60 If not given or 0, port 931 is used for fist instance, 932 for next...
61 For multiple interfaces, different ports must be given.
64 port number (remote interface)
65 If not given or 0, remote port equals local port
66 For multiple interfaces on equal sites, different ports must be given.
69 0 = fixed (always transmit packets, even when remote side timed out)
70 1 = on demand (only transmit packets, when remote side is detected)
72 NOTE: ID must also be set for on demand.
75 optional value to identify frames. This value must be equal on both
76 peers and should be random. If omitted or 0, no ID is transmitted.
79 NOTE: only one debug value must be given for all cards
80 enable debugging (see l1oip.h for debug options)
83 Special mISDN controls:
85 op = MISDN_CTRL_SETPEER*
86 p1 = bytes 0-3 : remote IP address in network order (left element first)
87 p2 = bytes 1-2 : remote port in network order (high byte first)
89 p2 = bytes 3-4 : local port in network order (high byte first)
91 op = MISDN_CTRL_UNSETPEER*
93 * Use l1oipctrl for comfortable setting or removing ip address.
94 (Layer 1 Over IP CTRL)
141 * Only included in some cases.
144 If version is missmatch, the frame must be ignored.
146 - T = Type of interface
147 Must be 0 for S0 or 1 for E1.
150 If bit is set, four ID bytes are included in frame.
153 Additional ID to prevent Denial of Service attacs. Also it prevents hijacking
154 connections with dynamic IP. The ID should be random and must not be 0.
156 - Coding = Type of codec
157 Must be 0 for no transcoding. Also for D-channel and other HDLC frames.
158 1 and 2 are reserved for explicitly use of a-LAW or u-LAW codec.
159 3 is used for generic table compressor.
161 - M = More channels to come. If this flag is 1, the following byte contains
162 the length of the channel data. After the data block, the next channel will
163 be defined. The flag for the last channel block (or if only one channel is
164 transmitted), must be 0 and no length is given.
166 - Channel = Channel number
168 1-3 channel data for S0 (3 is D-channel)
169 1-31 channel data for E1 (16 is D-channel)
170 32-127 channel data for extended E1 (16 is D-channel)
172 - The length is used if the M-flag is 1. It is used to find the next channel
174 NOTE: A value of 0 equals 256 bytes of data.
175 -> For larger data blocks, a single frame must be used.
176 -> For larger streams, a single frame or multiple blocks with same channel ID
179 - Time Base = Timestamp of first sample in frame
180 The "Time Base" is used to rearange packets and to detect packet loss.
181 The 16 bits are sent in network order (MSB first) and count 1/8000 th of a
182 second. This causes a wrap arround each 8,192 seconds. There is no requirement
183 for the initial "Time Base", but 0 should be used for the first packet.
184 In case of HDLC data, this timestamp counts the packet or byte number.
189 After initialisation, a timer of 15 seconds is started. Whenever a packet is
190 transmitted, the timer is reset to 15 seconds again. If the timer expires, an
191 empty packet is transmitted. This keep the connection alive.
193 When a valid packet is received, a timer 65 seconds is started. The interface
194 become ACTIVE. If the timer expires, the interface becomes INACTIVE.
199 To allow dynamic IP, the ID must be non 0. In this case, any packet with the
200 correct port number and ID will be accepted. If the remote side changes its IP
201 the new IP is used for all transmitted packets until it changes again.
206 If the ondemand parameter is given, the remote IP is set to 0 on timeout.
207 This will stop keepalive traffic to remote. If the remote is online again,
208 traffic will continue to the remote address. This is usefull for road warriors.
209 This feature only works with ID set, otherwhise it is highly unsecure.
215 The complete socket opening and closing is done by a thread.
216 When the thread opened a socket, the hc->socket descriptor is set. Whenever a
217 packet shall be sent to the socket, the hc->socket must be checked wheter not
218 NULL. To prevent change in socket descriptor, the hc->socket_lock must be used.
219 To change the socket, a recall of l1oip_socket_open() will safely kill the
220 socket process and create a new one.
224 #define L1OIP_VERSION 0 /* 0...3 */
226 #include <linux/module.h>
227 #include <linux/delay.h>
228 #include <linux/mISDNif.h>
229 #include <linux/mISDNhw.h>
230 #include <linux/mISDNdsp.h>
231 #include <linux/init.h>
232 #include <linux/in.h>
233 #include <linux/inet.h>
234 #include <linux/workqueue.h>
235 #include <linux/kthread.h>
236 #include <net/sock.h>
240 static const char *l1oip_revision = "2.00";
242 static int l1oip_cnt;
243 static spinlock_t l1oip_lock;
244 static struct list_head l1oip_ilist;
247 static u_int type[MAX_CARDS];
248 static u_int codec[MAX_CARDS];
249 static u_int ip[MAX_CARDS*4];
250 static u_int port[MAX_CARDS];
251 static u_int remoteport[MAX_CARDS];
252 static u_int ondemand[MAX_CARDS];
253 static u_int limit[MAX_CARDS];
254 static u_int id[MAX_CARDS];
258 MODULE_AUTHOR("Andreas Eversberg");
259 MODULE_LICENSE("GPL");
260 module_param_array(type, uint, NULL, S_IRUGO | S_IWUSR);
261 module_param_array(codec, uint, NULL, S_IRUGO | S_IWUSR);
262 module_param_array(ip, uint, NULL, S_IRUGO | S_IWUSR);
263 module_param_array(port, uint, NULL, S_IRUGO | S_IWUSR);
264 module_param_array(remoteport, uint, NULL, S_IRUGO | S_IWUSR);
265 module_param_array(ondemand, uint, NULL, S_IRUGO | S_IWUSR);
266 module_param_array(limit, uint, NULL, S_IRUGO | S_IWUSR);
267 module_param_array(id, uint, NULL, S_IRUGO | S_IWUSR);
268 module_param(ulaw, uint, S_IRUGO | S_IWUSR);
269 module_param(debug, uint, S_IRUGO | S_IWUSR);
272 * send a frame via socket, if open and restart timer
275 l1oip_socket_send(struct l1oip *hc, u8 localcodec, u8 channel, u32 chanmask,
276 u16 timebase, u8 *buf, int len)
281 struct socket *socket = NULL;
284 if (debug & DEBUG_L1OIP_MSG)
285 printk(KERN_DEBUG "%s: sending data to socket (len = %d)\n",
291 if ((int)(hc->keep_tl.expires-jiffies) < 5*HZ) {
292 del_timer(&hc->keep_tl);
293 hc->keep_tl.expires = jiffies + L1OIP_KEEPALIVE*HZ;
294 add_timer(&hc->keep_tl);
296 hc->keep_tl.expires = jiffies + L1OIP_KEEPALIVE*HZ;
298 if (debug & DEBUG_L1OIP_MSG)
299 printk(KERN_DEBUG "%s: resetting timer\n", __func__);
301 /* drop if we have no remote ip or port */
302 if (!hc->sin_remote.sin_addr.s_addr || !hc->sin_remote.sin_port) {
303 if (debug & DEBUG_L1OIP_MSG)
304 printk(KERN_DEBUG "%s: dropping frame, because remote "
305 "IP is not set.\n", __func__);
310 *p++ = (L1OIP_VERSION<<6) /* version and coding */
311 | (hc->pri?0x20:0x00) /* type */
312 | (hc->id?0x10:0x00) /* id */
315 *p++ = hc->id>>24; /* id */
320 *p++ = (multi == 1)?0x80:0x00 + channel; /* m-flag, channel */
322 *p++ = len; /* length */
323 *p++ = timebase>>8; /* time base */
326 if (buf && len) { /* add data to frame */
327 if (localcodec == 1 && ulaw)
328 l1oip_ulaw_to_alaw(buf, len, p);
329 else if (localcodec == 2 && !ulaw)
330 l1oip_alaw_to_ulaw(buf, len, p);
331 else if (localcodec == 3)
332 len = l1oip_law_to_4bit(buf, len, p,
333 &hc->chan[channel].codecstate);
339 /* check for socket in safe condition */
340 spin_lock(&hc->socket_lock);
342 spin_unlock(&hc->socket_lock);
348 spin_unlock(&hc->socket_lock);
350 if (debug & DEBUG_L1OIP_MSG)
351 printk(KERN_DEBUG "%s: sending packet to socket (len "
352 "= %d)\n", __func__, len);
353 hc->sendiov.iov_base = frame;
354 hc->sendiov.iov_len = len;
357 len = sock_sendmsg(socket, &hc->sendmsg, len);
359 /* give socket back */
360 hc->socket = socket; /* no locking required */
367 * receive channel data from socket
370 l1oip_socket_recv(struct l1oip *hc, u8 remotecodec, u8 channel, u16 timebase,
373 struct sk_buff *nskb;
374 struct bchannel *bch;
375 struct dchannel *dch;
380 if (debug & DEBUG_L1OIP_MSG)
381 printk(KERN_DEBUG "%s: received empty keepalive data, "
382 "ignoring\n", __func__);
386 if (debug & DEBUG_L1OIP_MSG)
387 printk(KERN_DEBUG "%s: received data, sending to mISDN (%d)\n",
390 if (channel < 1 || channel > 127) {
391 printk(KERN_WARNING "%s: packet error - channel %d out of "
392 "range\n", __func__, channel);
395 dch = hc->chan[channel].dch;
396 bch = hc->chan[channel].bch;
398 printk(KERN_WARNING "%s: packet error - channel %d not in "
399 "stack\n", __func__, channel);
403 /* prepare message */
404 nskb = mI_alloc_skb((remotecodec == 3)?(len<<1):len, GFP_ATOMIC);
406 printk(KERN_ERR "%s: No mem for skb.\n", __func__);
409 p = skb_put(nskb, (remotecodec == 3)?(len<<1):len);
411 if (remotecodec == 1 && ulaw)
412 l1oip_alaw_to_ulaw(buf, len, p);
413 else if (remotecodec == 2 && !ulaw)
414 l1oip_ulaw_to_alaw(buf, len, p);
415 else if (remotecodec == 3)
416 len = l1oip_4bit_to_law(buf, len, p);
420 /* send message up */
421 if (dch && len >= 2) {
426 /* expand 16 bit sequence number to 32 bit sequence number */
427 rx_counter = hc->chan[channel].rx_counter;
428 if (((s16)(timebase - rx_counter)) >= 0) {
429 /* time has changed forward */
430 if (timebase >= (rx_counter & 0xffff))
432 (rx_counter & 0xffff0000) | timebase;
434 rx_counter = ((rx_counter & 0xffff0000)+0x10000)
437 /* time has changed backwards */
438 if (timebase < (rx_counter & 0xffff))
440 (rx_counter & 0xffff0000) | timebase;
442 rx_counter = ((rx_counter & 0xffff0000)-0x10000)
445 hc->chan[channel].rx_counter = rx_counter;
448 if (hc->chan[channel].disorder_flag) {
451 skb = hc->chan[channel].disorder_skb;
452 hc->chan[channel].disorder_skb = nskb;
454 cnt = hc->chan[channel].disorder_cnt;
455 hc->chan[channel].disorder_cnt = rx_counter;
458 hc->chan[channel].disorder_flag ^= 1;
461 queue_ch_frame(&bch->ch, PH_DATA_IND, rx_counter, nskb);
467 * parse frame and extract channel data
470 l1oip_socket_parse(struct l1oip *hc, struct sockaddr_in *sin, u8 *buf, int len)
477 int len_start = len; /* initial frame length */
478 struct dchannel *dch = hc->chan[hc->d_idx].dch;
480 if (debug & DEBUG_L1OIP_MSG)
481 printk(KERN_DEBUG "%s: received frame, parsing... (%d)\n",
486 printk(KERN_WARNING "%s: packet error - length %d below "
487 "4 bytes\n", __func__, len);
492 if (((*buf)>>6) != L1OIP_VERSION) {
493 printk(KERN_WARNING "%s: packet error - unknown version %d\n",
494 __func__, buf[0]>>6);
499 if (((*buf)&0x20) && !hc->pri) {
500 printk(KERN_WARNING "%s: packet error - received E1 packet "
501 "on S0 interface\n", __func__);
504 if (!((*buf)&0x20) && hc->pri) {
505 printk(KERN_WARNING "%s: packet error - received S0 packet "
506 "on E1 interface\n", __func__);
511 packet_id = (*buf>>4)&1;
514 remotecodec = (*buf) & 0x0f;
515 if (remotecodec > 3) {
516 printk(KERN_WARNING "%s: packet error - remotecodec %d "
517 "unsupported\n", __func__, remotecodec);
523 /* check packet_id */
526 printk(KERN_WARNING "%s: packet error - packet has id "
527 "0x%x, but we have not\n", __func__, packet_id);
531 printk(KERN_WARNING "%s: packet error - packet too "
532 "short for ID value\n", __func__);
535 packet_id = (*buf++) << 24;
536 packet_id += (*buf++) << 16;
537 packet_id += (*buf++) << 8;
538 packet_id += (*buf++);
541 if (packet_id != hc->id) {
542 printk(KERN_WARNING "%s: packet error - ID mismatch, "
543 "got 0x%x, we 0x%x\n",
544 __func__, packet_id, hc->id);
549 printk(KERN_WARNING "%s: packet error - packet has no "
550 "ID, but we have\n", __func__);
557 printk(KERN_WARNING "%s: packet error - packet too short, "
558 "channel expected at position %d.\n",
559 __func__, len-len_start+1);
563 /* get channel and multiframe flag */
569 /* check length on multiframe */
572 printk(KERN_WARNING "%s: packet error - packet too "
573 "short, length expected at position %d.\n",
574 __func__, len_start-len-1);
583 printk(KERN_WARNING "%s: packet error - length %d at "
584 "position %d exceeds total length %d.\n",
585 __func__, mlen, len_start-len-1, len_start);
589 printk(KERN_WARNING "%s: packet error - length %d at "
590 "position %d will not allow additional "
592 __func__, mlen, len_start-len+1);
596 mlen = len-2; /* single frame, substract timebase */
599 printk(KERN_WARNING "%s: packet error - packet too short, time "
600 "base expected at position %d.\n",
601 __func__, len-len_start+1);
606 timebase = (*buf++) << 8;
607 timebase |= (*buf++);
610 /* if inactive, we send up a PH_ACTIVATE and activate */
611 if (!test_bit(FLG_ACTIVE, &dch->Flags)) {
612 if (debug & (DEBUG_L1OIP_MSG|DEBUG_L1OIP_SOCKET))
613 printk(KERN_DEBUG "%s: interface become active due to "
614 "received packet\n", __func__);
615 test_and_set_bit(FLG_ACTIVE, &dch->Flags);
616 _queue_data(&dch->dev.D, PH_ACTIVATE_IND, MISDN_ID_ANY, 0,
620 /* distribute packet */
621 l1oip_socket_recv(hc, remotecodec, channel, timebase, buf, mlen);
630 if ((int)(hc->timeout_tl.expires-jiffies) < 5*HZ || !hc->timeout_on) {
632 del_timer(&hc->timeout_tl);
633 hc->timeout_tl.expires = jiffies + L1OIP_TIMEOUT*HZ;
634 add_timer(&hc->timeout_tl);
635 } else /* only adjust timer */
636 hc->timeout_tl.expires = jiffies + L1OIP_TIMEOUT*HZ;
638 /* if ip or source port changes */
639 if ((hc->sin_remote.sin_addr.s_addr != sin->sin_addr.s_addr)
640 || (hc->sin_remote.sin_port != sin->sin_port)) {
641 if (debug & DEBUG_L1OIP_SOCKET)
642 printk(KERN_DEBUG "%s: remote address changes from "
643 "0x%08x to 0x%08x (port %d to %d)\n", __func__,
644 ntohl(hc->sin_remote.sin_addr.s_addr),
645 ntohl(sin->sin_addr.s_addr),
646 ntohs(hc->sin_remote.sin_port),
647 ntohs(sin->sin_port));
648 hc->sin_remote.sin_addr.s_addr = sin->sin_addr.s_addr;
649 hc->sin_remote.sin_port = sin->sin_port;
658 l1oip_socket_thread(void *data)
660 struct l1oip *hc = (struct l1oip *)data;
665 struct sockaddr_in sin_rx;
666 unsigned char recvbuf[1500];
668 struct socket *socket = NULL;
669 DECLARE_COMPLETION(wait);
672 allow_signal(SIGTERM);
675 if (sock_create(PF_INET, SOCK_DGRAM, IPPROTO_UDP, &socket)) {
676 printk(KERN_ERR "%s: Failed to create socket.\n", __func__);
680 /* set incoming address */
681 hc->sin_local.sin_family = AF_INET;
682 hc->sin_local.sin_addr.s_addr = INADDR_ANY;
683 hc->sin_local.sin_port = htons((unsigned short)hc->localport);
685 /* set outgoing address */
686 hc->sin_remote.sin_family = AF_INET;
687 hc->sin_remote.sin_addr.s_addr = htonl(hc->remoteip);
688 hc->sin_remote.sin_port = htons((unsigned short)hc->remoteport);
690 /* bind to incomming port */
691 if (socket->ops->bind(socket, (struct sockaddr *)&hc->sin_local,
692 sizeof(hc->sin_local))) {
693 printk(KERN_ERR "%s: Failed to bind socket to port %d.\n",
694 __func__, hc->localport);
700 if (socket->sk == NULL) {
701 printk(KERN_ERR "%s: socket->sk == NULL\n", __func__);
706 /* build receive message */
707 msg.msg_name = &sin_rx;
708 msg.msg_namelen = sizeof(sin_rx);
709 msg.msg_control = NULL;
710 msg.msg_controllen = 0;
714 /* build send message */
715 hc->sendmsg.msg_name = &hc->sin_remote;
716 hc->sendmsg.msg_namelen = sizeof(hc->sin_remote);
717 hc->sendmsg.msg_control = NULL;
718 hc->sendmsg.msg_controllen = 0;
719 hc->sendmsg.msg_iov = &hc->sendiov;
720 hc->sendmsg.msg_iovlen = 1;
722 /* give away socket */
723 spin_lock(&hc->socket_lock);
725 spin_unlock(&hc->socket_lock);
728 if (debug & DEBUG_L1OIP_SOCKET)
729 printk(KERN_DEBUG "%s: socket created and open\n",
731 while (!signal_pending(current)) {
732 iov.iov_base = recvbuf;
733 iov.iov_len = sizeof(recvbuf);
736 recvlen = sock_recvmsg(socket, &msg, sizeof(recvbuf), 0);
739 l1oip_socket_parse(hc, &sin_rx, recvbuf, recvlen);
741 if (debug & DEBUG_L1OIP_SOCKET)
742 printk(KERN_WARNING "%s: broken pipe on socket\n",
747 /* get socket back, check first if in use, maybe by send function */
748 spin_lock(&hc->socket_lock);
749 /* if hc->socket is NULL, it is in use until it is given back */
750 while (!hc->socket) {
751 spin_unlock(&hc->socket_lock);
752 schedule_timeout(HZ/10);
753 spin_lock(&hc->socket_lock);
756 spin_unlock(&hc->socket_lock);
758 if (debug & DEBUG_L1OIP_SOCKET)
759 printk(KERN_DEBUG "%s: socket thread terminating\n",
765 sock_release(socket);
767 /* if we got killed, signal completion */
768 complete(&hc->socket_complete);
769 hc->socket_thread = NULL; /* show termination of thread */
771 if (debug & DEBUG_L1OIP_SOCKET)
772 printk(KERN_DEBUG "%s: socket thread terminated\n",
778 l1oip_socket_close(struct l1oip *hc)
780 struct dchannel *dch = hc->chan[hc->d_idx].dch;
783 if (hc->socket_thread) {
784 if (debug & DEBUG_L1OIP_SOCKET)
785 printk(KERN_DEBUG "%s: socket thread exists, "
786 "killing...\n", __func__);
787 send_sig(SIGTERM, hc->socket_thread, 0);
788 wait_for_completion(&hc->socket_complete);
791 /* if active, we send up a PH_DEACTIVATE and deactivate */
792 if (test_bit(FLG_ACTIVE, &dch->Flags)) {
793 if (debug & (DEBUG_L1OIP_MSG|DEBUG_L1OIP_SOCKET))
794 printk(KERN_DEBUG "%s: interface become deactivated "
795 "due to timeout\n", __func__);
796 test_and_clear_bit(FLG_ACTIVE, &dch->Flags);
797 _queue_data(&dch->dev.D, PH_DEACTIVATE_IND, MISDN_ID_ANY, 0,
803 l1oip_socket_open(struct l1oip *hc)
805 /* in case of reopen, we need to close first */
806 l1oip_socket_close(hc);
808 init_completion(&hc->socket_complete);
810 /* create receive process */
811 hc->socket_thread = kthread_run(l1oip_socket_thread, hc, "l1oip_%s",
813 if (IS_ERR(hc->socket_thread)) {
814 int err = PTR_ERR(hc->socket_thread);
815 printk(KERN_ERR "%s: Failed (%d) to create socket process.\n",
817 hc->socket_thread = NULL;
818 sock_release(hc->socket);
821 if (debug & DEBUG_L1OIP_SOCKET)
822 printk(KERN_DEBUG "%s: socket thread created\n", __func__);
829 l1oip_send_bh(struct work_struct *work)
831 struct l1oip *hc = container_of(work, struct l1oip, workq);
833 if (debug & (DEBUG_L1OIP_MSG|DEBUG_L1OIP_SOCKET))
834 printk(KERN_DEBUG "%s: keepalive timer expired, sending empty "
835 "frame on dchannel\n", __func__);
837 /* send an empty l1oip frame at D-channel */
838 l1oip_socket_send(hc, 0, hc->d_idx, 0, 0, NULL, 0);
846 l1oip_keepalive(void *data)
848 struct l1oip *hc = (struct l1oip *)data;
850 schedule_work(&hc->workq);
854 l1oip_timeout(void *data)
856 struct l1oip *hc = (struct l1oip *)data;
857 struct dchannel *dch = hc->chan[hc->d_idx].dch;
859 if (debug & DEBUG_L1OIP_MSG)
860 printk(KERN_DEBUG "%s: timeout timer expired, turn layer one "
861 "down.\n", __func__);
863 hc->timeout_on = 0; /* state that timer must be initialized next time */
865 /* if timeout, we send up a PH_DEACTIVATE and deactivate */
866 if (test_bit(FLG_ACTIVE, &dch->Flags)) {
867 if (debug & (DEBUG_L1OIP_MSG|DEBUG_L1OIP_SOCKET))
868 printk(KERN_DEBUG "%s: interface become deactivated "
869 "due to timeout\n", __func__);
870 test_and_clear_bit(FLG_ACTIVE, &dch->Flags);
871 _queue_data(&dch->dev.D, PH_DEACTIVATE_IND, MISDN_ID_ANY, 0,
875 /* if we have ondemand set, we remove ip address */
877 if (debug & DEBUG_L1OIP_MSG)
878 printk(KERN_DEBUG "%s: on demand causes ip address to "
879 "be removed\n", __func__);
880 hc->sin_remote.sin_addr.s_addr = 0;
889 handle_dmsg(struct mISDNchannel *ch, struct sk_buff *skb)
891 struct mISDNdevice *dev = container_of(ch, struct mISDNdevice, D);
892 struct dchannel *dch = container_of(dev, struct dchannel, dev);
893 struct l1oip *hc = dch->hw;
894 struct mISDNhead *hh = mISDN_HEAD_P(skb);
902 printk(KERN_WARNING "%s: skb too small\n",
906 if (skb->len > MAX_DFRAME_LEN_L1 || skb->len > L1OIP_MAX_LEN) {
907 printk(KERN_WARNING "%s: skb too large\n",
915 ll = (l < L1OIP_MAX_PERFRAME)?l:L1OIP_MAX_PERFRAME;
916 l1oip_socket_send(hc, 0, dch->slot, 0,
917 hc->chan[dch->slot].tx_counter++, p, ll);
922 queue_ch_frame(ch, PH_DATA_CNF, hh->id, skb);
924 case PH_ACTIVATE_REQ:
925 if (debug & (DEBUG_L1OIP_MSG|DEBUG_L1OIP_SOCKET))
926 printk(KERN_DEBUG "%s: PH_ACTIVATE channel %d (1..%d)\n"
927 , __func__, dch->slot, hc->b_num+1);
929 if (test_bit(FLG_ACTIVE, &dch->Flags))
930 queue_ch_frame(ch, PH_ACTIVATE_IND, hh->id, skb);
932 queue_ch_frame(ch, PH_DEACTIVATE_IND, hh->id, skb);
934 case PH_DEACTIVATE_REQ:
935 if (debug & (DEBUG_L1OIP_MSG|DEBUG_L1OIP_SOCKET))
936 printk(KERN_DEBUG "%s: PH_DEACTIVATE channel %d "
937 "(1..%d)\n", __func__, dch->slot,
940 if (test_bit(FLG_ACTIVE, &dch->Flags))
941 queue_ch_frame(ch, PH_ACTIVATE_IND, hh->id, skb);
943 queue_ch_frame(ch, PH_DEACTIVATE_IND, hh->id, skb);
952 channel_dctrl(struct dchannel *dch, struct mISDN_ctrl_req *cq)
955 struct l1oip *hc = dch->hw;
958 case MISDN_CTRL_GETOP:
959 cq->op = MISDN_CTRL_SETPEER | MISDN_CTRL_UNSETPEER
960 | MISDN_CTRL_GETPEER;
962 case MISDN_CTRL_SETPEER:
963 hc->remoteip = (u32)cq->p1;
964 hc->remoteport = cq->p2 & 0xffff;
965 hc->localport = cq->p2 >> 16;
967 hc->remoteport = hc->localport;
968 if (debug & DEBUG_L1OIP_SOCKET)
969 printk(KERN_DEBUG "%s: got new ip address from user "
970 "space.\n", __func__);
971 l1oip_socket_open(hc);
973 case MISDN_CTRL_UNSETPEER:
974 if (debug & DEBUG_L1OIP_SOCKET)
975 printk(KERN_DEBUG "%s: removing ip address.\n",
978 l1oip_socket_open(hc);
980 case MISDN_CTRL_GETPEER:
981 if (debug & DEBUG_L1OIP_SOCKET)
982 printk(KERN_DEBUG "%s: getting ip address.\n",
984 cq->p1 = hc->remoteip;
985 cq->p2 = hc->remoteport | (hc->localport << 16);
988 printk(KERN_WARNING "%s: unknown Op %x\n",
997 open_dchannel(struct l1oip *hc, struct dchannel *dch, struct channel_req *rq)
999 if (debug & DEBUG_HW_OPEN)
1000 printk(KERN_DEBUG "%s: dev(%d) open from %p\n", __func__,
1001 dch->dev.id, __builtin_return_address(0));
1002 if (rq->protocol == ISDN_P_NONE)
1004 if ((dch->dev.D.protocol != ISDN_P_NONE) &&
1005 (dch->dev.D.protocol != rq->protocol)) {
1006 if (debug & DEBUG_HW_OPEN)
1007 printk(KERN_WARNING "%s: change protocol %x to %x\n",
1008 __func__, dch->dev.D.protocol, rq->protocol);
1010 if (dch->dev.D.protocol != rq->protocol)
1011 dch->dev.D.protocol = rq->protocol;
1013 if (test_bit(FLG_ACTIVE, &dch->Flags)) {
1014 _queue_data(&dch->dev.D, PH_ACTIVATE_IND, MISDN_ID_ANY,
1015 0, NULL, GFP_KERNEL);
1017 rq->ch = &dch->dev.D;
1018 if (!try_module_get(THIS_MODULE))
1019 printk(KERN_WARNING "%s:cannot get module\n", __func__);
1024 open_bchannel(struct l1oip *hc, struct dchannel *dch, struct channel_req *rq)
1026 struct bchannel *bch;
1029 if (!test_channelmap(rq->adr.channel, dch->dev.channelmap))
1031 if (rq->protocol == ISDN_P_NONE)
1033 ch = rq->adr.channel; /* BRI: 1=B1 2=B2 PRI: 1..15,17.. */
1034 bch = hc->chan[ch].bch;
1036 printk(KERN_ERR "%s:internal error ch %d has no bch\n",
1040 if (test_and_set_bit(FLG_OPEN, &bch->Flags))
1041 return -EBUSY; /* b-channel can be only open once */
1042 bch->ch.protocol = rq->protocol;
1044 if (!try_module_get(THIS_MODULE))
1045 printk(KERN_WARNING "%s:cannot get module\n", __func__);
1050 l1oip_dctrl(struct mISDNchannel *ch, u_int cmd, void *arg)
1052 struct mISDNdevice *dev = container_of(ch, struct mISDNdevice, D);
1053 struct dchannel *dch = container_of(dev, struct dchannel, dev);
1054 struct l1oip *hc = dch->hw;
1055 struct channel_req *rq;
1058 if (dch->debug & DEBUG_HW)
1059 printk(KERN_DEBUG "%s: cmd:%x %p\n",
1060 __func__, cmd, arg);
1064 switch (rq->protocol) {
1071 err = open_dchannel(hc, dch, rq);
1079 err = open_dchannel(hc, dch, rq);
1082 err = open_bchannel(hc, dch, rq);
1086 if (debug & DEBUG_HW_OPEN)
1087 printk(KERN_DEBUG "%s: dev(%d) close from %p\n",
1088 __func__, dch->dev.id,
1089 __builtin_return_address(0));
1090 module_put(THIS_MODULE);
1092 case CONTROL_CHANNEL:
1093 err = channel_dctrl(dch, arg);
1096 if (dch->debug & DEBUG_HW)
1097 printk(KERN_DEBUG "%s: unknown command %x\n",
1105 handle_bmsg(struct mISDNchannel *ch, struct sk_buff *skb)
1107 struct bchannel *bch = container_of(ch, struct bchannel, ch);
1108 struct l1oip *hc = bch->hw;
1110 struct mISDNhead *hh = mISDN_HEAD_P(skb);
1116 if (skb->len <= 0) {
1117 printk(KERN_WARNING "%s: skb too small\n",
1121 if (skb->len > MAX_DFRAME_LEN_L1 || skb->len > L1OIP_MAX_LEN) {
1122 printk(KERN_WARNING "%s: skb too large\n",
1126 /* check for AIS / ulaw-silence */
1129 for (i = 0; i < l; i++) {
1134 if (debug & DEBUG_L1OIP_MSG)
1135 printk(KERN_DEBUG "%s: got AIS, not sending, "
1136 "but counting\n", __func__);
1137 hc->chan[bch->slot].tx_counter += l;
1139 queue_ch_frame(ch, PH_DATA_CNF, hh->id, skb);
1142 /* check for silence */
1145 for (i = 0; i < l; i++) {
1150 if (debug & DEBUG_L1OIP_MSG)
1151 printk(KERN_DEBUG "%s: got silence, not sending"
1152 ", but counting\n", __func__);
1153 hc->chan[bch->slot].tx_counter += l;
1155 queue_ch_frame(ch, PH_DATA_CNF, hh->id, skb);
1163 ll = (l < L1OIP_MAX_PERFRAME)?l:L1OIP_MAX_PERFRAME;
1164 l1oip_socket_send(hc, hc->codec, bch->slot, 0,
1165 hc->chan[bch->slot].tx_counter, p, ll);
1166 hc->chan[bch->slot].tx_counter += ll;
1171 queue_ch_frame(ch, PH_DATA_CNF, hh->id, skb);
1173 case PH_ACTIVATE_REQ:
1174 if (debug & (DEBUG_L1OIP_MSG|DEBUG_L1OIP_SOCKET))
1175 printk(KERN_DEBUG "%s: PH_ACTIVATE channel %d (1..%d)\n"
1176 , __func__, bch->slot, hc->b_num+1);
1177 hc->chan[bch->slot].codecstate = 0;
1178 test_and_set_bit(FLG_ACTIVE, &bch->Flags);
1180 queue_ch_frame(ch, PH_ACTIVATE_IND, hh->id, skb);
1182 case PH_DEACTIVATE_REQ:
1183 if (debug & (DEBUG_L1OIP_MSG|DEBUG_L1OIP_SOCKET))
1184 printk(KERN_DEBUG "%s: PH_DEACTIVATE channel %d "
1185 "(1..%d)\n", __func__, bch->slot,
1187 test_and_clear_bit(FLG_ACTIVE, &bch->Flags);
1189 queue_ch_frame(ch, PH_DEACTIVATE_IND, hh->id, skb);
1198 channel_bctrl(struct bchannel *bch, struct mISDN_ctrl_req *cq)
1201 struct dsp_features *features =
1202 (struct dsp_features *)(*((u_long *)&cq->p1));
1205 case MISDN_CTRL_GETOP:
1206 cq->op = MISDN_CTRL_HW_FEATURES_OP;
1208 case MISDN_CTRL_HW_FEATURES: /* fill features structure */
1209 if (debug & DEBUG_L1OIP_MSG)
1210 printk(KERN_DEBUG "%s: HW_FEATURE request\n",
1212 /* create confirm */
1213 features->unclocked = 1;
1214 features->unordered = 1;
1217 printk(KERN_WARNING "%s: unknown Op %x\n",
1226 l1oip_bctrl(struct mISDNchannel *ch, u_int cmd, void *arg)
1228 struct bchannel *bch = container_of(ch, struct bchannel, ch);
1231 if (bch->debug & DEBUG_HW)
1232 printk(KERN_DEBUG "%s: cmd:%x %p\n",
1233 __func__, cmd, arg);
1236 test_and_clear_bit(FLG_OPEN, &bch->Flags);
1237 test_and_clear_bit(FLG_ACTIVE, &bch->Flags);
1238 ch->protocol = ISDN_P_NONE;
1240 module_put(THIS_MODULE);
1243 case CONTROL_CHANNEL:
1244 err = channel_bctrl(bch, arg);
1247 printk(KERN_WARNING "%s: unknown prim(%x)\n",
1255 * cleanup module and stack
1258 release_card(struct l1oip *hc)
1262 if (timer_pending(&hc->keep_tl))
1263 del_timer(&hc->keep_tl);
1265 if (timer_pending(&hc->timeout_tl))
1266 del_timer(&hc->timeout_tl);
1268 if (hc->socket_thread)
1269 l1oip_socket_close(hc);
1271 if (hc->registered && hc->chan[hc->d_idx].dch)
1272 mISDN_unregister_device(&hc->chan[hc->d_idx].dch->dev);
1273 for (ch = 0; ch < 128; ch++) {
1274 if (hc->chan[ch].dch) {
1275 mISDN_freedchannel(hc->chan[ch].dch);
1276 kfree(hc->chan[ch].dch);
1278 if (hc->chan[ch].bch) {
1279 mISDN_freebchannel(hc->chan[ch].bch);
1280 kfree(hc->chan[ch].bch);
1281 #ifdef REORDER_DEBUG
1282 if (hc->chan[ch].disorder_skb)
1283 dev_kfree_skb(hc->chan[ch].disorder_skb);
1288 spin_lock(&l1oip_lock);
1289 list_del(&hc->list);
1290 spin_unlock(&l1oip_lock);
1298 struct l1oip *hc, *next;
1300 list_for_each_entry_safe(hc, next, &l1oip_ilist, list)
1308 * module and stack init
1311 init_card(struct l1oip *hc, int pri, int bundle)
1313 struct dchannel *dch;
1314 struct bchannel *bch;
1318 spin_lock_init(&hc->socket_lock);
1319 hc->idx = l1oip_cnt;
1321 hc->d_idx = pri?16:3;
1322 hc->b_num = pri?30:2;
1323 hc->bundle = bundle;
1325 sprintf(hc->name, "l1oip-e1.%d", l1oip_cnt + 1);
1327 sprintf(hc->name, "l1oip-s0.%d", l1oip_cnt + 1);
1329 switch (codec[l1oip_cnt]) {
1336 printk(KERN_ERR "Codec(%d) not supported.\n",
1340 hc->codec = codec[l1oip_cnt];
1341 if (debug & DEBUG_L1OIP_INIT)
1342 printk(KERN_DEBUG "%s: using codec %d\n",
1343 __func__, hc->codec);
1345 if (id[l1oip_cnt] == 0) {
1346 printk(KERN_WARNING "Warning: No 'id' value given or "
1347 "0, this is highly unsecure. Please use 32 "
1348 "bit randmom number 0x...\n");
1350 hc->id = id[l1oip_cnt];
1351 if (debug & DEBUG_L1OIP_INIT)
1352 printk(KERN_DEBUG "%s: using id 0x%x\n", __func__, hc->id);
1354 hc->ondemand = ondemand[l1oip_cnt];
1355 if (hc->ondemand && !hc->id) {
1356 printk(KERN_ERR "%s: ondemand option only allowed in "
1357 "conjunction with non 0 ID\n", __func__);
1361 if (limit[l1oip_cnt])
1362 hc->b_num = limit[l1oip_cnt];
1363 if (!pri && hc->b_num > 2) {
1364 printk(KERN_ERR "Maximum limit for BRI interface is 2 "
1368 if (pri && hc->b_num > 126) {
1369 printk(KERN_ERR "Maximum limit for PRI interface is 126 "
1373 if (pri && hc->b_num > 30) {
1374 printk(KERN_WARNING "Maximum limit for BRI interface is 30 "
1376 printk(KERN_WARNING "Your selection of %d channels must be "
1377 "supported by application.\n", hc->limit);
1380 hc->remoteip = ip[l1oip_cnt<<2] << 24
1381 | ip[(l1oip_cnt<<2)+1] << 16
1382 | ip[(l1oip_cnt<<2)+2] << 8
1383 | ip[(l1oip_cnt<<2)+3];
1384 hc->localport = port[l1oip_cnt]?:(L1OIP_DEFAULTPORT+l1oip_cnt);
1385 if (remoteport[l1oip_cnt])
1386 hc->remoteport = remoteport[l1oip_cnt];
1388 hc->remoteport = hc->localport;
1389 if (debug & DEBUG_L1OIP_INIT)
1390 printk(KERN_DEBUG "%s: using local port %d remote ip "
1391 "%d.%d.%d.%d port %d ondemand %d\n", __func__,
1392 hc->localport, hc->remoteip >> 24,
1393 (hc->remoteip >> 16) & 0xff,
1394 (hc->remoteip >> 8) & 0xff, hc->remoteip & 0xff,
1395 hc->remoteport, hc->ondemand);
1397 dch = kzalloc(sizeof(struct dchannel), GFP_KERNEL);
1401 mISDN_initdchannel(dch, MAX_DFRAME_LEN_L1, NULL);
1404 dch->dev.Dprotocols = (1 << ISDN_P_TE_E1) | (1 << ISDN_P_NT_E1);
1406 dch->dev.Dprotocols = (1 << ISDN_P_TE_S0) | (1 << ISDN_P_NT_S0);
1407 dch->dev.Bprotocols = (1 << (ISDN_P_B_RAW & ISDN_P_B_MASK)) |
1408 (1 << (ISDN_P_B_HDLC & ISDN_P_B_MASK));
1409 dch->dev.D.send = handle_dmsg;
1410 dch->dev.D.ctrl = l1oip_dctrl;
1411 dch->dev.nrbchan = hc->b_num;
1412 dch->slot = hc->d_idx;
1413 hc->chan[hc->d_idx].dch = dch;
1415 for (ch = 0; ch < dch->dev.nrbchan; ch++) {
1418 bch = kzalloc(sizeof(struct bchannel), GFP_KERNEL);
1420 printk(KERN_ERR "%s: no memory for bchannel\n",
1427 mISDN_initbchannel(bch, MAX_DATA_MEM);
1429 bch->ch.send = handle_bmsg;
1430 bch->ch.ctrl = l1oip_bctrl;
1431 bch->ch.nr = i + ch;
1432 list_add(&bch->ch.list, &dch->dev.bchannels);
1433 hc->chan[i + ch].bch = bch;
1434 set_channelmap(bch->nr, dch->dev.channelmap);
1436 /* TODO: create a parent device for this driver */
1437 ret = mISDN_register_device(&dch->dev, NULL, hc->name);
1442 if (debug & DEBUG_L1OIP_INIT)
1443 printk(KERN_DEBUG "%s: Setting up network card(%d)\n",
1444 __func__, l1oip_cnt + 1);
1445 ret = l1oip_socket_open(hc);
1449 hc->keep_tl.function = (void *)l1oip_keepalive;
1450 hc->keep_tl.data = (ulong)hc;
1451 init_timer(&hc->keep_tl);
1452 hc->keep_tl.expires = jiffies + 2*HZ; /* two seconds first time */
1453 add_timer(&hc->keep_tl);
1455 hc->timeout_tl.function = (void *)l1oip_timeout;
1456 hc->timeout_tl.data = (ulong)hc;
1457 init_timer(&hc->timeout_tl);
1458 hc->timeout_on = 0; /* state that we have timer off */
1470 printk(KERN_INFO "mISDN: Layer-1-over-IP driver Rev. %s\n",
1473 INIT_LIST_HEAD(&l1oip_ilist);
1474 spin_lock_init(&l1oip_lock);
1476 if (l1oip_4bit_alloc(ulaw))
1480 while (type[l1oip_cnt] && l1oip_cnt < MAX_CARDS) {
1481 switch (type[l1oip_cnt] & 0xff) {
1499 printk(KERN_ERR "Card type(%d) not supported.\n",
1500 type[l1oip_cnt] & 0xff);
1505 if (debug & DEBUG_L1OIP_INIT)
1506 printk(KERN_DEBUG "%s: interface %d is %s with %s.\n",
1507 __func__, l1oip_cnt, pri?"PRI":"BRI",
1508 bundle?"bundled IP packet for all B-channels"
1509 :"seperate IP packets for every B-channel");
1511 hc = kzalloc(sizeof(struct l1oip), GFP_ATOMIC);
1513 printk(KERN_ERR "No kmem for L1-over-IP driver.\n");
1517 INIT_WORK(&hc->workq, (void *)l1oip_send_bh);
1519 spin_lock(&l1oip_lock);
1520 list_add_tail(&hc->list, &l1oip_ilist);
1521 spin_unlock(&l1oip_lock);
1523 ret = init_card(hc, pri, bundle);
1531 printk(KERN_INFO "%d virtual devices registered\n", l1oip_cnt);
1535 module_init(l1oip_init);
1536 module_exit(l1oip_cleanup);