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 around 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 useful 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 <linux/slab.h>
237 #include <linux/sched/signal.h>
239 #include <net/sock.h>
243 static const char *l1oip_revision = "2.00";
245 static int l1oip_cnt;
246 static spinlock_t l1oip_lock;
247 static struct list_head l1oip_ilist;
250 static u_int type[MAX_CARDS];
251 static u_int codec[MAX_CARDS];
252 static u_int ip[MAX_CARDS * 4];
253 static u_int port[MAX_CARDS];
254 static u_int remoteport[MAX_CARDS];
255 static u_int ondemand[MAX_CARDS];
256 static u_int limit[MAX_CARDS];
257 static u_int id[MAX_CARDS];
261 MODULE_AUTHOR("Andreas Eversberg");
262 MODULE_LICENSE("GPL");
263 module_param_array(type, uint, NULL, S_IRUGO | S_IWUSR);
264 module_param_array(codec, uint, NULL, S_IRUGO | S_IWUSR);
265 module_param_array(ip, uint, NULL, S_IRUGO | S_IWUSR);
266 module_param_array(port, uint, NULL, S_IRUGO | S_IWUSR);
267 module_param_array(remoteport, uint, NULL, S_IRUGO | S_IWUSR);
268 module_param_array(ondemand, uint, NULL, S_IRUGO | S_IWUSR);
269 module_param_array(limit, uint, NULL, S_IRUGO | S_IWUSR);
270 module_param_array(id, uint, NULL, S_IRUGO | S_IWUSR);
271 module_param(ulaw, uint, S_IRUGO | S_IWUSR);
272 module_param(debug, uint, S_IRUGO | S_IWUSR);
275 * send a frame via socket, if open and restart timer
278 l1oip_socket_send(struct l1oip *hc, u8 localcodec, u8 channel, u32 chanmask,
279 u16 timebase, u8 *buf, int len)
282 u8 frame[MAX_DFRAME_LEN_L1 + 32];
283 struct socket *socket = NULL;
285 if (debug & DEBUG_L1OIP_MSG)
286 printk(KERN_DEBUG "%s: sending data to socket (len = %d)\n",
292 if (time_before(hc->keep_tl.expires, jiffies + 5 * HZ))
293 mod_timer(&hc->keep_tl, jiffies + L1OIP_KEEPALIVE * HZ);
295 hc->keep_tl.expires = jiffies + L1OIP_KEEPALIVE * HZ;
297 if (debug & DEBUG_L1OIP_MSG)
298 printk(KERN_DEBUG "%s: resetting timer\n", __func__);
300 /* drop if we have no remote ip or port */
301 if (!hc->sin_remote.sin_addr.s_addr || !hc->sin_remote.sin_port) {
302 if (debug & DEBUG_L1OIP_MSG)
303 printk(KERN_DEBUG "%s: dropping frame, because remote "
304 "IP is not set.\n", __func__);
309 *p++ = (L1OIP_VERSION << 6) /* version and coding */
310 | (hc->pri ? 0x20 : 0x00) /* type */
311 | (hc->id ? 0x10 : 0x00) /* id */
314 *p++ = hc->id >> 24; /* id */
319 *p++ = 0x00 + channel; /* m-flag, channel */
320 *p++ = timebase >> 8; /* time base */
323 if (buf && len) { /* add data to frame */
324 if (localcodec == 1 && ulaw)
325 l1oip_ulaw_to_alaw(buf, len, p);
326 else if (localcodec == 2 && !ulaw)
327 l1oip_alaw_to_ulaw(buf, len, p);
328 else if (localcodec == 3)
329 len = l1oip_law_to_4bit(buf, len, p,
330 &hc->chan[channel].codecstate);
336 /* check for socket in safe condition */
337 spin_lock(&hc->socket_lock);
339 spin_unlock(&hc->socket_lock);
345 spin_unlock(&hc->socket_lock);
347 if (debug & DEBUG_L1OIP_MSG)
348 printk(KERN_DEBUG "%s: sending packet to socket (len "
349 "= %d)\n", __func__, len);
350 hc->sendiov.iov_base = frame;
351 hc->sendiov.iov_len = len;
352 len = kernel_sendmsg(socket, &hc->sendmsg, &hc->sendiov, 1, len);
353 /* give socket back */
354 hc->socket = socket; /* no locking required */
361 * receive channel data from socket
364 l1oip_socket_recv(struct l1oip *hc, u8 remotecodec, u8 channel, u16 timebase,
367 struct sk_buff *nskb;
368 struct bchannel *bch;
369 struct dchannel *dch;
374 if (debug & DEBUG_L1OIP_MSG)
375 printk(KERN_DEBUG "%s: received empty keepalive data, "
376 "ignoring\n", __func__);
380 if (debug & DEBUG_L1OIP_MSG)
381 printk(KERN_DEBUG "%s: received data, sending to mISDN (%d)\n",
384 if (channel < 1 || channel > 127) {
385 printk(KERN_WARNING "%s: packet error - channel %d out of "
386 "range\n", __func__, channel);
389 dch = hc->chan[channel].dch;
390 bch = hc->chan[channel].bch;
392 printk(KERN_WARNING "%s: packet error - channel %d not in "
393 "stack\n", __func__, channel);
397 /* prepare message */
398 nskb = mI_alloc_skb((remotecodec == 3) ? (len << 1) : len, GFP_ATOMIC);
400 printk(KERN_ERR "%s: No mem for skb.\n", __func__);
403 p = skb_put(nskb, (remotecodec == 3) ? (len << 1) : len);
405 if (remotecodec == 1 && ulaw)
406 l1oip_alaw_to_ulaw(buf, len, p);
407 else if (remotecodec == 2 && !ulaw)
408 l1oip_ulaw_to_alaw(buf, len, p);
409 else if (remotecodec == 3)
410 len = l1oip_4bit_to_law(buf, len, p);
414 /* send message up */
415 if (dch && len >= 2) {
420 /* expand 16 bit sequence number to 32 bit sequence number */
421 rx_counter = hc->chan[channel].rx_counter;
422 if (((s16)(timebase - rx_counter)) >= 0) {
423 /* time has changed forward */
424 if (timebase >= (rx_counter & 0xffff))
426 (rx_counter & 0xffff0000) | timebase;
428 rx_counter = ((rx_counter & 0xffff0000) + 0x10000)
431 /* time has changed backwards */
432 if (timebase < (rx_counter & 0xffff))
434 (rx_counter & 0xffff0000) | timebase;
436 rx_counter = ((rx_counter & 0xffff0000) - 0x10000)
439 hc->chan[channel].rx_counter = rx_counter;
442 if (hc->chan[channel].disorder_flag) {
443 swap(hc->chan[channel].disorder_skb, nskb);
444 swap(hc->chan[channel].disorder_cnt, rx_counter);
446 hc->chan[channel].disorder_flag ^= 1;
449 queue_ch_frame(&bch->ch, PH_DATA_IND, rx_counter, nskb);
455 * parse frame and extract channel data
458 l1oip_socket_parse(struct l1oip *hc, struct sockaddr_in *sin, u8 *buf, int len)
465 int len_start = len; /* initial frame length */
466 struct dchannel *dch = hc->chan[hc->d_idx].dch;
468 if (debug & DEBUG_L1OIP_MSG)
469 printk(KERN_DEBUG "%s: received frame, parsing... (%d)\n",
473 if (len < 1 + 1 + 2) {
474 printk(KERN_WARNING "%s: packet error - length %d below "
475 "4 bytes\n", __func__, len);
480 if (((*buf) >> 6) != L1OIP_VERSION) {
481 printk(KERN_WARNING "%s: packet error - unknown version %d\n",
482 __func__, buf[0]>>6);
487 if (((*buf) & 0x20) && !hc->pri) {
488 printk(KERN_WARNING "%s: packet error - received E1 packet "
489 "on S0 interface\n", __func__);
492 if (!((*buf) & 0x20) && hc->pri) {
493 printk(KERN_WARNING "%s: packet error - received S0 packet "
494 "on E1 interface\n", __func__);
499 packet_id = (*buf >> 4) & 1;
502 remotecodec = (*buf) & 0x0f;
503 if (remotecodec > 3) {
504 printk(KERN_WARNING "%s: packet error - remotecodec %d "
505 "unsupported\n", __func__, remotecodec);
511 /* check packet_id */
514 printk(KERN_WARNING "%s: packet error - packet has id "
515 "0x%x, but we have not\n", __func__, packet_id);
519 printk(KERN_WARNING "%s: packet error - packet too "
520 "short for ID value\n", __func__);
523 packet_id = (*buf++) << 24;
524 packet_id += (*buf++) << 16;
525 packet_id += (*buf++) << 8;
526 packet_id += (*buf++);
529 if (packet_id != hc->id) {
530 printk(KERN_WARNING "%s: packet error - ID mismatch, "
531 "got 0x%x, we 0x%x\n",
532 __func__, packet_id, hc->id);
537 printk(KERN_WARNING "%s: packet error - packet has no "
538 "ID, but we have\n", __func__);
545 printk(KERN_WARNING "%s: packet error - packet too short, "
546 "channel expected at position %d.\n",
547 __func__, len-len_start + 1);
551 /* get channel and multiframe flag */
552 channel = *buf & 0x7f;
557 /* check length on multiframe */
560 printk(KERN_WARNING "%s: packet error - packet too "
561 "short, length expected at position %d.\n",
562 __func__, len_start - len - 1);
570 if (len < mlen + 3) {
571 printk(KERN_WARNING "%s: packet error - length %d at "
572 "position %d exceeds total length %d.\n",
573 __func__, mlen, len_start-len - 1, len_start);
576 if (len == mlen + 3) {
577 printk(KERN_WARNING "%s: packet error - length %d at "
578 "position %d will not allow additional "
580 __func__, mlen, len_start-len + 1);
584 mlen = len - 2; /* single frame, subtract timebase */
587 printk(KERN_WARNING "%s: packet error - packet too short, time "
588 "base expected at position %d.\n",
589 __func__, len-len_start + 1);
594 timebase = (*buf++) << 8;
595 timebase |= (*buf++);
598 /* if inactive, we send up a PH_ACTIVATE and activate */
599 if (!test_bit(FLG_ACTIVE, &dch->Flags)) {
600 if (debug & (DEBUG_L1OIP_MSG | DEBUG_L1OIP_SOCKET))
601 printk(KERN_DEBUG "%s: interface become active due to "
602 "received packet\n", __func__);
603 test_and_set_bit(FLG_ACTIVE, &dch->Flags);
604 _queue_data(&dch->dev.D, PH_ACTIVATE_IND, MISDN_ID_ANY, 0,
608 /* distribute packet */
609 l1oip_socket_recv(hc, remotecodec, channel, timebase, buf, mlen);
618 if (time_before(hc->timeout_tl.expires, jiffies + 5 * HZ) || !hc->timeout_on) {
620 mod_timer(&hc->timeout_tl, jiffies + L1OIP_TIMEOUT * HZ);
621 } else /* only adjust timer */
622 hc->timeout_tl.expires = jiffies + L1OIP_TIMEOUT * HZ;
624 /* if ip or source port changes */
625 if ((hc->sin_remote.sin_addr.s_addr != sin->sin_addr.s_addr)
626 || (hc->sin_remote.sin_port != sin->sin_port)) {
627 if (debug & DEBUG_L1OIP_SOCKET)
628 printk(KERN_DEBUG "%s: remote address changes from "
629 "0x%08x to 0x%08x (port %d to %d)\n", __func__,
630 ntohl(hc->sin_remote.sin_addr.s_addr),
631 ntohl(sin->sin_addr.s_addr),
632 ntohs(hc->sin_remote.sin_port),
633 ntohs(sin->sin_port));
634 hc->sin_remote.sin_addr.s_addr = sin->sin_addr.s_addr;
635 hc->sin_remote.sin_port = sin->sin_port;
644 l1oip_socket_thread(void *data)
646 struct l1oip *hc = (struct l1oip *)data;
648 struct sockaddr_in sin_rx;
650 struct msghdr msg = {.msg_name = &sin_rx,
651 .msg_namelen = sizeof(sin_rx)};
652 unsigned char *recvbuf;
653 size_t recvbuf_size = 1500;
655 struct socket *socket = NULL;
656 DECLARE_COMPLETION_ONSTACK(wait);
658 /* allocate buffer memory */
659 recvbuf = kmalloc(recvbuf_size, GFP_KERNEL);
661 printk(KERN_ERR "%s: Failed to alloc recvbuf.\n", __func__);
666 iov.iov_base = recvbuf;
667 iov.iov_len = recvbuf_size;
670 allow_signal(SIGTERM);
673 if (sock_create(PF_INET, SOCK_DGRAM, IPPROTO_UDP, &socket)) {
674 printk(KERN_ERR "%s: Failed to create socket.\n", __func__);
679 /* set incoming address */
680 hc->sin_local.sin_family = AF_INET;
681 hc->sin_local.sin_addr.s_addr = INADDR_ANY;
682 hc->sin_local.sin_port = htons((unsigned short)hc->localport);
684 /* set outgoing address */
685 hc->sin_remote.sin_family = AF_INET;
686 hc->sin_remote.sin_addr.s_addr = htonl(hc->remoteip);
687 hc->sin_remote.sin_port = htons((unsigned short)hc->remoteport);
689 /* bind to incoming port */
690 if (socket->ops->bind(socket, (struct sockaddr *)&hc->sin_local,
691 sizeof(hc->sin_local))) {
692 printk(KERN_ERR "%s: Failed to bind socket to port %d.\n",
693 __func__, hc->localport);
699 if (socket->sk == NULL) {
700 printk(KERN_ERR "%s: socket->sk == NULL\n", __func__);
705 /* build send message */
706 hc->sendmsg.msg_name = &hc->sin_remote;
707 hc->sendmsg.msg_namelen = sizeof(hc->sin_remote);
708 hc->sendmsg.msg_control = NULL;
709 hc->sendmsg.msg_controllen = 0;
711 /* give away socket */
712 spin_lock(&hc->socket_lock);
714 spin_unlock(&hc->socket_lock);
717 if (debug & DEBUG_L1OIP_SOCKET)
718 printk(KERN_DEBUG "%s: socket created and open\n",
720 while (!signal_pending(current)) {
721 iov_iter_kvec(&msg.msg_iter, READ, &iov, 1, recvbuf_size);
722 recvlen = sock_recvmsg(socket, &msg, 0);
724 l1oip_socket_parse(hc, &sin_rx, recvbuf, recvlen);
726 if (debug & DEBUG_L1OIP_SOCKET)
728 "%s: broken pipe on socket\n", __func__);
732 /* get socket back, check first if in use, maybe by send function */
733 spin_lock(&hc->socket_lock);
734 /* if hc->socket is NULL, it is in use until it is given back */
735 while (!hc->socket) {
736 spin_unlock(&hc->socket_lock);
737 schedule_timeout(HZ / 10);
738 spin_lock(&hc->socket_lock);
741 spin_unlock(&hc->socket_lock);
743 if (debug & DEBUG_L1OIP_SOCKET)
744 printk(KERN_DEBUG "%s: socket thread terminating\n",
753 sock_release(socket);
755 /* if we got killed, signal completion */
756 complete(&hc->socket_complete);
757 hc->socket_thread = NULL; /* show termination of thread */
759 if (debug & DEBUG_L1OIP_SOCKET)
760 printk(KERN_DEBUG "%s: socket thread terminated\n",
766 l1oip_socket_close(struct l1oip *hc)
768 struct dchannel *dch = hc->chan[hc->d_idx].dch;
771 if (hc->socket_thread) {
772 if (debug & DEBUG_L1OIP_SOCKET)
773 printk(KERN_DEBUG "%s: socket thread exists, "
774 "killing...\n", __func__);
775 send_sig(SIGTERM, hc->socket_thread, 0);
776 wait_for_completion(&hc->socket_complete);
779 /* if active, we send up a PH_DEACTIVATE and deactivate */
780 if (test_bit(FLG_ACTIVE, &dch->Flags)) {
781 if (debug & (DEBUG_L1OIP_MSG | DEBUG_L1OIP_SOCKET))
782 printk(KERN_DEBUG "%s: interface become deactivated "
783 "due to timeout\n", __func__);
784 test_and_clear_bit(FLG_ACTIVE, &dch->Flags);
785 _queue_data(&dch->dev.D, PH_DEACTIVATE_IND, MISDN_ID_ANY, 0,
791 l1oip_socket_open(struct l1oip *hc)
793 /* in case of reopen, we need to close first */
794 l1oip_socket_close(hc);
796 init_completion(&hc->socket_complete);
798 /* create receive process */
799 hc->socket_thread = kthread_run(l1oip_socket_thread, hc, "l1oip_%s",
801 if (IS_ERR(hc->socket_thread)) {
802 int err = PTR_ERR(hc->socket_thread);
803 printk(KERN_ERR "%s: Failed (%d) to create socket process.\n",
805 hc->socket_thread = NULL;
806 sock_release(hc->socket);
809 if (debug & DEBUG_L1OIP_SOCKET)
810 printk(KERN_DEBUG "%s: socket thread created\n", __func__);
817 l1oip_send_bh(struct work_struct *work)
819 struct l1oip *hc = container_of(work, struct l1oip, workq);
821 if (debug & (DEBUG_L1OIP_MSG | DEBUG_L1OIP_SOCKET))
822 printk(KERN_DEBUG "%s: keepalive timer expired, sending empty "
823 "frame on dchannel\n", __func__);
825 /* send an empty l1oip frame at D-channel */
826 l1oip_socket_send(hc, 0, hc->d_idx, 0, 0, NULL, 0);
834 l1oip_keepalive(struct timer_list *t)
836 struct l1oip *hc = from_timer(hc, t, keep_tl);
838 schedule_work(&hc->workq);
842 l1oip_timeout(struct timer_list *t)
844 struct l1oip *hc = from_timer(hc, t,
846 struct dchannel *dch = hc->chan[hc->d_idx].dch;
848 if (debug & DEBUG_L1OIP_MSG)
849 printk(KERN_DEBUG "%s: timeout timer expired, turn layer one "
850 "down.\n", __func__);
852 hc->timeout_on = 0; /* state that timer must be initialized next time */
854 /* if timeout, we send up a PH_DEACTIVATE and deactivate */
855 if (test_bit(FLG_ACTIVE, &dch->Flags)) {
856 if (debug & (DEBUG_L1OIP_MSG | DEBUG_L1OIP_SOCKET))
857 printk(KERN_DEBUG "%s: interface become deactivated "
858 "due to timeout\n", __func__);
859 test_and_clear_bit(FLG_ACTIVE, &dch->Flags);
860 _queue_data(&dch->dev.D, PH_DEACTIVATE_IND, MISDN_ID_ANY, 0,
864 /* if we have ondemand set, we remove ip address */
866 if (debug & DEBUG_L1OIP_MSG)
867 printk(KERN_DEBUG "%s: on demand causes ip address to "
868 "be removed\n", __func__);
869 hc->sin_remote.sin_addr.s_addr = 0;
878 handle_dmsg(struct mISDNchannel *ch, struct sk_buff *skb)
880 struct mISDNdevice *dev = container_of(ch, struct mISDNdevice, D);
881 struct dchannel *dch = container_of(dev, struct dchannel, dev);
882 struct l1oip *hc = dch->hw;
883 struct mISDNhead *hh = mISDN_HEAD_P(skb);
891 printk(KERN_WARNING "%s: skb too small\n",
895 if (skb->len > MAX_DFRAME_LEN_L1 || skb->len > L1OIP_MAX_LEN) {
896 printk(KERN_WARNING "%s: skb too large\n",
905 * This is technically bounded by L1OIP_MAX_PERFRAME but
906 * MAX_DFRAME_LEN_L1 < L1OIP_MAX_PERFRAME
908 ll = (l < MAX_DFRAME_LEN_L1) ? l : MAX_DFRAME_LEN_L1;
909 l1oip_socket_send(hc, 0, dch->slot, 0,
910 hc->chan[dch->slot].tx_counter++, p, ll);
915 queue_ch_frame(ch, PH_DATA_CNF, hh->id, skb);
917 case PH_ACTIVATE_REQ:
918 if (debug & (DEBUG_L1OIP_MSG | DEBUG_L1OIP_SOCKET))
919 printk(KERN_DEBUG "%s: PH_ACTIVATE channel %d (1..%d)\n"
920 , __func__, dch->slot, hc->b_num + 1);
922 if (test_bit(FLG_ACTIVE, &dch->Flags))
923 queue_ch_frame(ch, PH_ACTIVATE_IND, hh->id, skb);
925 queue_ch_frame(ch, PH_DEACTIVATE_IND, hh->id, skb);
927 case PH_DEACTIVATE_REQ:
928 if (debug & (DEBUG_L1OIP_MSG | DEBUG_L1OIP_SOCKET))
929 printk(KERN_DEBUG "%s: PH_DEACTIVATE channel %d "
930 "(1..%d)\n", __func__, dch->slot,
933 if (test_bit(FLG_ACTIVE, &dch->Flags))
934 queue_ch_frame(ch, PH_ACTIVATE_IND, hh->id, skb);
936 queue_ch_frame(ch, PH_DEACTIVATE_IND, hh->id, skb);
945 channel_dctrl(struct dchannel *dch, struct mISDN_ctrl_req *cq)
948 struct l1oip *hc = dch->hw;
951 case MISDN_CTRL_GETOP:
952 cq->op = MISDN_CTRL_SETPEER | MISDN_CTRL_UNSETPEER
953 | MISDN_CTRL_GETPEER;
955 case MISDN_CTRL_SETPEER:
956 hc->remoteip = (u32)cq->p1;
957 hc->remoteport = cq->p2 & 0xffff;
958 hc->localport = cq->p2 >> 16;
960 hc->remoteport = hc->localport;
961 if (debug & DEBUG_L1OIP_SOCKET)
962 printk(KERN_DEBUG "%s: got new ip address from user "
963 "space.\n", __func__);
964 l1oip_socket_open(hc);
966 case MISDN_CTRL_UNSETPEER:
967 if (debug & DEBUG_L1OIP_SOCKET)
968 printk(KERN_DEBUG "%s: removing ip address.\n",
971 l1oip_socket_open(hc);
973 case MISDN_CTRL_GETPEER:
974 if (debug & DEBUG_L1OIP_SOCKET)
975 printk(KERN_DEBUG "%s: getting ip address.\n",
977 cq->p1 = hc->remoteip;
978 cq->p2 = hc->remoteport | (hc->localport << 16);
981 printk(KERN_WARNING "%s: unknown Op %x\n",
990 open_dchannel(struct l1oip *hc, struct dchannel *dch, struct channel_req *rq)
992 if (debug & DEBUG_HW_OPEN)
993 printk(KERN_DEBUG "%s: dev(%d) open from %p\n", __func__,
994 dch->dev.id, __builtin_return_address(0));
995 if (rq->protocol == ISDN_P_NONE)
997 if ((dch->dev.D.protocol != ISDN_P_NONE) &&
998 (dch->dev.D.protocol != rq->protocol)) {
999 if (debug & DEBUG_HW_OPEN)
1000 printk(KERN_WARNING "%s: change protocol %x to %x\n",
1001 __func__, dch->dev.D.protocol, rq->protocol);
1003 if (dch->dev.D.protocol != rq->protocol)
1004 dch->dev.D.protocol = rq->protocol;
1006 if (test_bit(FLG_ACTIVE, &dch->Flags)) {
1007 _queue_data(&dch->dev.D, PH_ACTIVATE_IND, MISDN_ID_ANY,
1008 0, NULL, GFP_KERNEL);
1010 rq->ch = &dch->dev.D;
1011 if (!try_module_get(THIS_MODULE))
1012 printk(KERN_WARNING "%s:cannot get module\n", __func__);
1017 open_bchannel(struct l1oip *hc, struct dchannel *dch, struct channel_req *rq)
1019 struct bchannel *bch;
1022 if (!test_channelmap(rq->adr.channel, dch->dev.channelmap))
1024 if (rq->protocol == ISDN_P_NONE)
1026 ch = rq->adr.channel; /* BRI: 1=B1 2=B2 PRI: 1..15,17.. */
1027 bch = hc->chan[ch].bch;
1029 printk(KERN_ERR "%s:internal error ch %d has no bch\n",
1033 if (test_and_set_bit(FLG_OPEN, &bch->Flags))
1034 return -EBUSY; /* b-channel can be only open once */
1035 bch->ch.protocol = rq->protocol;
1037 if (!try_module_get(THIS_MODULE))
1038 printk(KERN_WARNING "%s:cannot get module\n", __func__);
1043 l1oip_dctrl(struct mISDNchannel *ch, u_int cmd, void *arg)
1045 struct mISDNdevice *dev = container_of(ch, struct mISDNdevice, D);
1046 struct dchannel *dch = container_of(dev, struct dchannel, dev);
1047 struct l1oip *hc = dch->hw;
1048 struct channel_req *rq;
1051 if (dch->debug & DEBUG_HW)
1052 printk(KERN_DEBUG "%s: cmd:%x %p\n",
1053 __func__, cmd, arg);
1057 switch (rq->protocol) {
1064 err = open_dchannel(hc, dch, rq);
1072 err = open_dchannel(hc, dch, rq);
1075 err = open_bchannel(hc, dch, rq);
1079 if (debug & DEBUG_HW_OPEN)
1080 printk(KERN_DEBUG "%s: dev(%d) close from %p\n",
1081 __func__, dch->dev.id,
1082 __builtin_return_address(0));
1083 module_put(THIS_MODULE);
1085 case CONTROL_CHANNEL:
1086 err = channel_dctrl(dch, arg);
1089 if (dch->debug & DEBUG_HW)
1090 printk(KERN_DEBUG "%s: unknown command %x\n",
1098 handle_bmsg(struct mISDNchannel *ch, struct sk_buff *skb)
1100 struct bchannel *bch = container_of(ch, struct bchannel, ch);
1101 struct l1oip *hc = bch->hw;
1103 struct mISDNhead *hh = mISDN_HEAD_P(skb);
1109 if (skb->len <= 0) {
1110 printk(KERN_WARNING "%s: skb too small\n",
1114 if (skb->len > MAX_DFRAME_LEN_L1 || skb->len > L1OIP_MAX_LEN) {
1115 printk(KERN_WARNING "%s: skb too large\n",
1119 /* check for AIS / ulaw-silence */
1121 if (!memchr_inv(skb->data, 0xff, l)) {
1122 if (debug & DEBUG_L1OIP_MSG)
1123 printk(KERN_DEBUG "%s: got AIS, not sending, "
1124 "but counting\n", __func__);
1125 hc->chan[bch->slot].tx_counter += l;
1127 queue_ch_frame(ch, PH_DATA_CNF, hh->id, skb);
1130 /* check for silence */
1132 if (!memchr_inv(skb->data, 0x2a, l)) {
1133 if (debug & DEBUG_L1OIP_MSG)
1134 printk(KERN_DEBUG "%s: got silence, not sending"
1135 ", but counting\n", __func__);
1136 hc->chan[bch->slot].tx_counter += l;
1138 queue_ch_frame(ch, PH_DATA_CNF, hh->id, skb);
1147 * This is technically bounded by L1OIP_MAX_PERFRAME but
1148 * MAX_DFRAME_LEN_L1 < L1OIP_MAX_PERFRAME
1150 ll = (l < MAX_DFRAME_LEN_L1) ? l : MAX_DFRAME_LEN_L1;
1151 l1oip_socket_send(hc, hc->codec, bch->slot, 0,
1152 hc->chan[bch->slot].tx_counter, p, ll);
1153 hc->chan[bch->slot].tx_counter += ll;
1158 queue_ch_frame(ch, PH_DATA_CNF, hh->id, skb);
1160 case PH_ACTIVATE_REQ:
1161 if (debug & (DEBUG_L1OIP_MSG | DEBUG_L1OIP_SOCKET))
1162 printk(KERN_DEBUG "%s: PH_ACTIVATE channel %d (1..%d)\n"
1163 , __func__, bch->slot, hc->b_num + 1);
1164 hc->chan[bch->slot].codecstate = 0;
1165 test_and_set_bit(FLG_ACTIVE, &bch->Flags);
1167 queue_ch_frame(ch, PH_ACTIVATE_IND, hh->id, skb);
1169 case PH_DEACTIVATE_REQ:
1170 if (debug & (DEBUG_L1OIP_MSG | DEBUG_L1OIP_SOCKET))
1171 printk(KERN_DEBUG "%s: PH_DEACTIVATE channel %d "
1172 "(1..%d)\n", __func__, bch->slot,
1174 test_and_clear_bit(FLG_ACTIVE, &bch->Flags);
1176 queue_ch_frame(ch, PH_DEACTIVATE_IND, hh->id, skb);
1185 channel_bctrl(struct bchannel *bch, struct mISDN_ctrl_req *cq)
1188 struct dsp_features *features =
1189 (struct dsp_features *)(*((u_long *)&cq->p1));
1192 case MISDN_CTRL_GETOP:
1193 cq->op = MISDN_CTRL_HW_FEATURES_OP;
1195 case MISDN_CTRL_HW_FEATURES: /* fill features structure */
1196 if (debug & DEBUG_L1OIP_MSG)
1197 printk(KERN_DEBUG "%s: HW_FEATURE request\n",
1199 /* create confirm */
1200 features->unclocked = 1;
1201 features->unordered = 1;
1204 printk(KERN_WARNING "%s: unknown Op %x\n",
1213 l1oip_bctrl(struct mISDNchannel *ch, u_int cmd, void *arg)
1215 struct bchannel *bch = container_of(ch, struct bchannel, ch);
1218 if (bch->debug & DEBUG_HW)
1219 printk(KERN_DEBUG "%s: cmd:%x %p\n",
1220 __func__, cmd, arg);
1223 test_and_clear_bit(FLG_OPEN, &bch->Flags);
1224 test_and_clear_bit(FLG_ACTIVE, &bch->Flags);
1225 ch->protocol = ISDN_P_NONE;
1227 module_put(THIS_MODULE);
1230 case CONTROL_CHANNEL:
1231 err = channel_bctrl(bch, arg);
1234 printk(KERN_WARNING "%s: unknown prim(%x)\n",
1242 * cleanup module and stack
1245 release_card(struct l1oip *hc)
1249 if (timer_pending(&hc->keep_tl))
1250 del_timer(&hc->keep_tl);
1252 if (timer_pending(&hc->timeout_tl))
1253 del_timer(&hc->timeout_tl);
1255 cancel_work_sync(&hc->workq);
1257 if (hc->socket_thread)
1258 l1oip_socket_close(hc);
1260 if (hc->registered && hc->chan[hc->d_idx].dch)
1261 mISDN_unregister_device(&hc->chan[hc->d_idx].dch->dev);
1262 for (ch = 0; ch < 128; ch++) {
1263 if (hc->chan[ch].dch) {
1264 mISDN_freedchannel(hc->chan[ch].dch);
1265 kfree(hc->chan[ch].dch);
1267 if (hc->chan[ch].bch) {
1268 mISDN_freebchannel(hc->chan[ch].bch);
1269 kfree(hc->chan[ch].bch);
1270 #ifdef REORDER_DEBUG
1271 if (hc->chan[ch].disorder_skb)
1272 dev_kfree_skb(hc->chan[ch].disorder_skb);
1277 spin_lock(&l1oip_lock);
1278 list_del(&hc->list);
1279 spin_unlock(&l1oip_lock);
1287 struct l1oip *hc, *next;
1289 list_for_each_entry_safe(hc, next, &l1oip_ilist, list)
1297 * module and stack init
1300 init_card(struct l1oip *hc, int pri, int bundle)
1302 struct dchannel *dch;
1303 struct bchannel *bch;
1307 spin_lock_init(&hc->socket_lock);
1308 hc->idx = l1oip_cnt;
1310 hc->d_idx = pri ? 16 : 3;
1311 hc->b_num = pri ? 30 : 2;
1312 hc->bundle = bundle;
1314 sprintf(hc->name, "l1oip-e1.%d", l1oip_cnt + 1);
1316 sprintf(hc->name, "l1oip-s0.%d", l1oip_cnt + 1);
1318 switch (codec[l1oip_cnt]) {
1325 printk(KERN_ERR "Codec(%d) not supported.\n",
1329 hc->codec = codec[l1oip_cnt];
1330 if (debug & DEBUG_L1OIP_INIT)
1331 printk(KERN_DEBUG "%s: using codec %d\n",
1332 __func__, hc->codec);
1334 if (id[l1oip_cnt] == 0) {
1335 printk(KERN_WARNING "Warning: No 'id' value given or "
1336 "0, this is highly unsecure. Please use 32 "
1337 "bit random number 0x...\n");
1339 hc->id = id[l1oip_cnt];
1340 if (debug & DEBUG_L1OIP_INIT)
1341 printk(KERN_DEBUG "%s: using id 0x%x\n", __func__, hc->id);
1343 hc->ondemand = ondemand[l1oip_cnt];
1344 if (hc->ondemand && !hc->id) {
1345 printk(KERN_ERR "%s: ondemand option only allowed in "
1346 "conjunction with non 0 ID\n", __func__);
1350 if (limit[l1oip_cnt])
1351 hc->b_num = limit[l1oip_cnt];
1352 if (!pri && hc->b_num > 2) {
1353 printk(KERN_ERR "Maximum limit for BRI interface is 2 "
1357 if (pri && hc->b_num > 126) {
1358 printk(KERN_ERR "Maximum limit for PRI interface is 126 "
1362 if (pri && hc->b_num > 30) {
1363 printk(KERN_WARNING "Maximum limit for BRI interface is 30 "
1365 printk(KERN_WARNING "Your selection of %d channels must be "
1366 "supported by application.\n", hc->limit);
1369 hc->remoteip = ip[l1oip_cnt << 2] << 24
1370 | ip[(l1oip_cnt << 2) + 1] << 16
1371 | ip[(l1oip_cnt << 2) + 2] << 8
1372 | ip[(l1oip_cnt << 2) + 3];
1373 hc->localport = port[l1oip_cnt]?:(L1OIP_DEFAULTPORT + l1oip_cnt);
1374 if (remoteport[l1oip_cnt])
1375 hc->remoteport = remoteport[l1oip_cnt];
1377 hc->remoteport = hc->localport;
1378 if (debug & DEBUG_L1OIP_INIT)
1379 printk(KERN_DEBUG "%s: using local port %d remote ip "
1380 "%d.%d.%d.%d port %d ondemand %d\n", __func__,
1381 hc->localport, hc->remoteip >> 24,
1382 (hc->remoteip >> 16) & 0xff,
1383 (hc->remoteip >> 8) & 0xff, hc->remoteip & 0xff,
1384 hc->remoteport, hc->ondemand);
1386 dch = kzalloc(sizeof(struct dchannel), GFP_KERNEL);
1390 mISDN_initdchannel(dch, MAX_DFRAME_LEN_L1, NULL);
1393 dch->dev.Dprotocols = (1 << ISDN_P_TE_E1) | (1 << ISDN_P_NT_E1);
1395 dch->dev.Dprotocols = (1 << ISDN_P_TE_S0) | (1 << ISDN_P_NT_S0);
1396 dch->dev.Bprotocols = (1 << (ISDN_P_B_RAW & ISDN_P_B_MASK)) |
1397 (1 << (ISDN_P_B_HDLC & ISDN_P_B_MASK));
1398 dch->dev.D.send = handle_dmsg;
1399 dch->dev.D.ctrl = l1oip_dctrl;
1400 dch->dev.nrbchan = hc->b_num;
1401 dch->slot = hc->d_idx;
1402 hc->chan[hc->d_idx].dch = dch;
1404 for (ch = 0; ch < dch->dev.nrbchan; ch++) {
1407 bch = kzalloc(sizeof(struct bchannel), GFP_KERNEL);
1409 printk(KERN_ERR "%s: no memory for bchannel\n",
1416 mISDN_initbchannel(bch, MAX_DATA_MEM, 0);
1418 bch->ch.send = handle_bmsg;
1419 bch->ch.ctrl = l1oip_bctrl;
1420 bch->ch.nr = i + ch;
1421 list_add(&bch->ch.list, &dch->dev.bchannels);
1422 hc->chan[i + ch].bch = bch;
1423 set_channelmap(bch->nr, dch->dev.channelmap);
1425 /* TODO: create a parent device for this driver */
1426 ret = mISDN_register_device(&dch->dev, NULL, hc->name);
1431 if (debug & DEBUG_L1OIP_INIT)
1432 printk(KERN_DEBUG "%s: Setting up network card(%d)\n",
1433 __func__, l1oip_cnt + 1);
1434 ret = l1oip_socket_open(hc);
1438 timer_setup(&hc->keep_tl, l1oip_keepalive, 0);
1439 hc->keep_tl.expires = jiffies + 2 * HZ; /* two seconds first time */
1440 add_timer(&hc->keep_tl);
1442 timer_setup(&hc->timeout_tl, l1oip_timeout, 0);
1443 hc->timeout_on = 0; /* state that we have timer off */
1455 printk(KERN_INFO "mISDN: Layer-1-over-IP driver Rev. %s\n",
1458 INIT_LIST_HEAD(&l1oip_ilist);
1459 spin_lock_init(&l1oip_lock);
1461 if (l1oip_4bit_alloc(ulaw))
1465 while (l1oip_cnt < MAX_CARDS && type[l1oip_cnt]) {
1466 switch (type[l1oip_cnt] & 0xff) {
1484 printk(KERN_ERR "Card type(%d) not supported.\n",
1485 type[l1oip_cnt] & 0xff);
1490 if (debug & DEBUG_L1OIP_INIT)
1491 printk(KERN_DEBUG "%s: interface %d is %s with %s.\n",
1492 __func__, l1oip_cnt, pri ? "PRI" : "BRI",
1493 bundle ? "bundled IP packet for all B-channels" :
1494 "separate IP packets for every B-channel");
1496 hc = kzalloc(sizeof(struct l1oip), GFP_ATOMIC);
1498 printk(KERN_ERR "No kmem for L1-over-IP driver.\n");
1502 INIT_WORK(&hc->workq, (void *)l1oip_send_bh);
1504 spin_lock(&l1oip_lock);
1505 list_add_tail(&hc->list, &l1oip_ilist);
1506 spin_unlock(&l1oip_lock);
1508 ret = init_card(hc, pri, bundle);
1516 printk(KERN_INFO "%d virtual devices registered\n", l1oip_cnt);
1520 module_init(l1oip_init);
1521 module_exit(l1oip_cleanup);