2 * IrNET protocol module : Synchronous PPP over an IrDA socket.
4 * Jean II - HPL `00 - <jt@hpl.hp.com>
6 * This file implement the PPP interface and /dev/irnet character device.
7 * The PPP interface hook to the ppp_generic module, handle all our
8 * relationship to the PPP code in the kernel (and by extension to pppd),
9 * and exchange PPP frames with this module (send/receive).
10 * The /dev/irnet device is used primarily for 2 functions :
11 * 1) as a stub for pppd (the ppp daemon), so that we can appropriately
12 * generate PPP sessions (we pretend we are a tty).
13 * 2) as a control channel (write commands, read events)
16 #include "irnet_ppp.h" /* Private header */
17 /* Please put other headers in irnet.h - Thanks */
19 /* Generic PPP callbacks (to call us) */
20 static struct ppp_channel_ops irnet_ppp_ops = {
21 .start_xmit = ppp_irnet_send,
22 .ioctl = ppp_irnet_ioctl
25 /************************* CONTROL CHANNEL *************************/
27 * When a pppd instance is not active on /dev/irnet, it acts as a control
29 * Writing allow to set up the IrDA destination of the IrNET channel,
30 * and any application may be read events happening in IrNET...
33 /*------------------------------------------------------------------*/
35 * Write is used to send a command to configure a IrNET channel
36 * before it is open by pppd. The syntax is : "command argument"
37 * Currently there is only two defined commands :
38 * o name : set the requested IrDA nickname of the IrNET peer.
39 * o addr : set the requested IrDA address of the IrNET peer.
40 * Note : the code is crude, but effective...
43 irnet_ctrl_write(irnet_socket * ap,
44 const char __user *buf,
47 char command[IRNET_MAX_COMMAND];
48 char * start; /* Current command being processed */
49 char * next; /* Next command to process */
50 int length; /* Length of current command */
52 DENTER(CTRL_TRACE, "(ap=0x%p, count=%Zd)\n", ap, count);
54 /* Check for overflow... */
55 DABORT(count >= IRNET_MAX_COMMAND, -ENOMEM,
56 CTRL_ERROR, "Too much data !!!\n");
58 /* Get the data in the driver */
59 if(copy_from_user(command, buf, count))
61 DERROR(CTRL_ERROR, "Invalid user space pointer.\n");
65 /* Safe terminate the string */
66 command[count] = '\0';
67 DEBUG(CTRL_INFO, "Command line received is ``%s'' (%Zd).\n",
70 /* Check every commands in the command line */
74 /* Look at the next command */
77 /* Scrap whitespaces before the command */
78 while(isspace(*start))
81 /* ',' is our command separator */
82 next = strchr(start, ',');
85 *next = '\0'; /* Terminate command */
86 length = next - start; /* Length */
87 next++; /* Skip the '\0' */
90 length = strlen(start);
92 DEBUG(CTRL_INFO, "Found command ``%s'' (%d).\n", start, length);
94 /* Check if we recognised one of the known command
95 * We can't use "switch" with strings, so hack with "continue" */
97 /* First command : name -> Requested IrDA nickname */
98 if(!strncmp(start, "name", 4))
100 /* Copy the name only if is included and not "any" */
101 if((length > 5) && (strcmp(start + 5, "any")))
103 /* Strip out trailing whitespaces */
104 while(isspace(start[length - 1]))
107 /* Copy the name for later reuse */
108 memcpy(ap->rname, start + 5, length - 5);
109 ap->rname[length - 5] = '\0';
113 DEBUG(CTRL_INFO, "Got rname = ``%s''\n", ap->rname);
115 /* Restart the loop */
119 /* Second command : addr, daddr -> Requested IrDA destination address
120 * Also process : saddr -> Requested IrDA source address */
121 if((!strncmp(start, "addr", 4)) ||
122 (!strncmp(start, "daddr", 5)) ||
123 (!strncmp(start, "saddr", 5)))
125 __u32 addr = DEV_ADDR_ANY;
127 /* Copy the address only if is included and not "any" */
128 if((length > 5) && (strcmp(start + 5, "any")))
130 char * begp = start + 5;
133 /* Scrap whitespaces before the command */
134 while(isspace(*begp))
137 /* Convert argument to a number (last arg is the base) */
138 addr = simple_strtoul(begp, &endp, 16);
139 /* Has it worked ? (endp should be start + length) */
140 DABORT(endp <= (start + 5), -EINVAL,
141 CTRL_ERROR, "Invalid address.\n");
143 /* Which type of address ? */
148 DEBUG(CTRL_INFO, "Got rsaddr = %08x\n", ap->rsaddr);
154 DEBUG(CTRL_INFO, "Got rdaddr = %08x\n", ap->rdaddr);
157 /* Restart the loop */
161 /* Other possible command : connect N (number of retries) */
163 /* No command matched -> Failed... */
164 DABORT(1, -EINVAL, CTRL_ERROR, "Not a recognised IrNET command.\n");
167 /* Success : we have parsed all commands successfully */
171 #ifdef INITIAL_DISCOVERY
172 /*------------------------------------------------------------------*/
174 * Function irnet_get_discovery_log (self)
176 * Query the content on the discovery log if not done
178 * This function query the current content of the discovery log
179 * at the startup of the event channel and save it in the internal struct.
182 irnet_get_discovery_log(irnet_socket * ap)
184 __u16 mask = irlmp_service_to_hint(S_LAN);
186 /* Ask IrLMP for the current discovery log */
187 ap->discoveries = irlmp_get_discoveries(&ap->disco_number, mask,
188 DISCOVERY_DEFAULT_SLOTS);
190 /* Check if the we got some results */
191 if(ap->discoveries == NULL)
192 ap->disco_number = -1;
194 DEBUG(CTRL_INFO, "Got the log (0x%p), size is %d\n",
195 ap->discoveries, ap->disco_number);
198 /*------------------------------------------------------------------*/
200 * Function irnet_read_discovery_log (self, event)
202 * Read the content on the discovery log
204 * This function dump the current content of the discovery log
205 * at the startup of the event channel.
206 * Return 1 if wrote an event on the control channel...
208 * State of the ap->disco_XXX variables :
209 * Socket creation : discoveries = NULL ; disco_index = 0 ; disco_number = 0
210 * While reading : discoveries = ptr ; disco_index = X ; disco_number = Y
211 * After reading : discoveries = NULL ; disco_index = Y ; disco_number = -1
214 irnet_read_discovery_log(irnet_socket * ap,
219 DENTER(CTRL_TRACE, "(ap=0x%p, event=0x%p)\n",
222 /* Test if we have some work to do or we have already finished */
223 if(ap->disco_number == -1)
225 DEBUG(CTRL_INFO, "Already done\n");
229 /* Test if it's the first time and therefore we need to get the log */
230 if(ap->discoveries == NULL)
231 irnet_get_discovery_log(ap);
233 /* Check if we have more item to dump */
234 if(ap->disco_index < ap->disco_number)
237 sprintf(event, "Found %08x (%s) behind %08x {hints %02X-%02X}\n",
238 ap->discoveries[ap->disco_index].daddr,
239 ap->discoveries[ap->disco_index].info,
240 ap->discoveries[ap->disco_index].saddr,
241 ap->discoveries[ap->disco_index].hints[0],
242 ap->discoveries[ap->disco_index].hints[1]);
243 DEBUG(CTRL_INFO, "Writing discovery %d : %s\n",
244 ap->disco_index, ap->discoveries[ap->disco_index].info);
246 /* We have an event */
252 /* Check if we have done the last item */
253 if(ap->disco_index >= ap->disco_number)
255 /* No more items : remove the log and signal termination */
256 DEBUG(CTRL_INFO, "Cleaning up log (0x%p)\n",
258 if(ap->discoveries != NULL)
260 /* Cleanup our copy of the discovery log */
261 kfree(ap->discoveries);
262 ap->discoveries = NULL;
264 ap->disco_number = -1;
269 #endif /* INITIAL_DISCOVERY */
271 /*------------------------------------------------------------------*/
273 * Read is used to get IrNET events
275 static inline ssize_t
276 irnet_ctrl_read(irnet_socket * ap,
281 DECLARE_WAITQUEUE(wait, current);
282 char event[64]; /* Max event is 61 char */
285 DENTER(CTRL_TRACE, "(ap=0x%p, count=%Zd)\n", ap, count);
287 /* Check if we can write an event out in one go */
288 DABORT(count < sizeof(event), -EOVERFLOW, CTRL_ERROR, "Buffer to small.\n");
290 #ifdef INITIAL_DISCOVERY
291 /* Check if we have read the log */
292 if(irnet_read_discovery_log(ap, event))
294 /* We have an event !!! Copy it to the user */
295 if(copy_to_user(buf, event, strlen(event)))
297 DERROR(CTRL_ERROR, "Invalid user space pointer.\n");
301 DEXIT(CTRL_TRACE, "\n");
302 return(strlen(event));
304 #endif /* INITIAL_DISCOVERY */
306 /* Put ourselves on the wait queue to be woken up */
307 add_wait_queue(&irnet_events.rwait, &wait);
308 current->state = TASK_INTERRUPTIBLE;
311 /* If there is unread events */
313 if(ap->event_index != irnet_events.index)
316 if(file->f_flags & O_NONBLOCK)
319 if(signal_pending(current))
321 /* Yield and wait to be woken up */
324 current->state = TASK_RUNNING;
325 remove_wait_queue(&irnet_events.rwait, &wait);
327 /* Did we got it ? */
330 /* No, return the error code */
331 DEXIT(CTRL_TRACE, " - ret %Zd\n", ret);
335 /* Which event is it ? */
336 switch(irnet_events.log[ap->event_index].event)
339 sprintf(event, "Discovered %08x (%s) behind %08x {hints %02X-%02X}\n",
340 irnet_events.log[ap->event_index].daddr,
341 irnet_events.log[ap->event_index].name,
342 irnet_events.log[ap->event_index].saddr,
343 irnet_events.log[ap->event_index].hints.byte[0],
344 irnet_events.log[ap->event_index].hints.byte[1]);
347 sprintf(event, "Expired %08x (%s) behind %08x {hints %02X-%02X}\n",
348 irnet_events.log[ap->event_index].daddr,
349 irnet_events.log[ap->event_index].name,
350 irnet_events.log[ap->event_index].saddr,
351 irnet_events.log[ap->event_index].hints.byte[0],
352 irnet_events.log[ap->event_index].hints.byte[1]);
354 case IRNET_CONNECT_TO:
355 sprintf(event, "Connected to %08x (%s) on ppp%d\n",
356 irnet_events.log[ap->event_index].daddr,
357 irnet_events.log[ap->event_index].name,
358 irnet_events.log[ap->event_index].unit);
360 case IRNET_CONNECT_FROM:
361 sprintf(event, "Connection from %08x (%s) on ppp%d\n",
362 irnet_events.log[ap->event_index].daddr,
363 irnet_events.log[ap->event_index].name,
364 irnet_events.log[ap->event_index].unit);
366 case IRNET_REQUEST_FROM:
367 sprintf(event, "Request from %08x (%s) behind %08x\n",
368 irnet_events.log[ap->event_index].daddr,
369 irnet_events.log[ap->event_index].name,
370 irnet_events.log[ap->event_index].saddr);
372 case IRNET_NOANSWER_FROM:
373 sprintf(event, "No-answer from %08x (%s) on ppp%d\n",
374 irnet_events.log[ap->event_index].daddr,
375 irnet_events.log[ap->event_index].name,
376 irnet_events.log[ap->event_index].unit);
378 case IRNET_BLOCKED_LINK:
379 sprintf(event, "Blocked link with %08x (%s) on ppp%d\n",
380 irnet_events.log[ap->event_index].daddr,
381 irnet_events.log[ap->event_index].name,
382 irnet_events.log[ap->event_index].unit);
384 case IRNET_DISCONNECT_FROM:
385 sprintf(event, "Disconnection from %08x (%s) on ppp%d\n",
386 irnet_events.log[ap->event_index].daddr,
387 irnet_events.log[ap->event_index].name,
388 irnet_events.log[ap->event_index].unit);
390 case IRNET_DISCONNECT_TO:
391 sprintf(event, "Disconnected to %08x (%s)\n",
392 irnet_events.log[ap->event_index].daddr,
393 irnet_events.log[ap->event_index].name);
396 sprintf(event, "Bug\n");
398 /* Increment our event index */
399 ap->event_index = (ap->event_index + 1) % IRNET_MAX_EVENTS;
401 DEBUG(CTRL_INFO, "Event is :%s", event);
403 /* Copy it to the user */
404 if(copy_to_user(buf, event, strlen(event)))
406 DERROR(CTRL_ERROR, "Invalid user space pointer.\n");
410 DEXIT(CTRL_TRACE, "\n");
411 return(strlen(event));
414 /*------------------------------------------------------------------*/
416 * Poll : called when someone do a select on /dev/irnet.
417 * Just check if there are new events...
419 static inline unsigned int
420 irnet_ctrl_poll(irnet_socket * ap,
426 DENTER(CTRL_TRACE, "(ap=0x%p)\n", ap);
428 poll_wait(file, &irnet_events.rwait, wait);
429 mask = POLLOUT | POLLWRNORM;
430 /* If there is unread events */
431 if(ap->event_index != irnet_events.index)
432 mask |= POLLIN | POLLRDNORM;
433 #ifdef INITIAL_DISCOVERY
434 if(ap->disco_number != -1)
436 /* Test if it's the first time and therefore we need to get the log */
437 if(ap->discoveries == NULL)
438 irnet_get_discovery_log(ap);
440 if(ap->disco_number != -1)
441 mask |= POLLIN | POLLRDNORM;
443 #endif /* INITIAL_DISCOVERY */
445 DEXIT(CTRL_TRACE, " - mask=0x%X\n", mask);
450 /*********************** FILESYSTEM CALLBACKS ***********************/
452 * Implement the usual open, read, write functions that will be called
453 * by the file system when some action is performed on /dev/irnet.
454 * Most of those actions will in fact be performed by "pppd" or
455 * the control channel, we just act as a redirector...
458 /*------------------------------------------------------------------*/
460 * Open : when somebody open /dev/irnet
461 * We basically create a new instance of irnet and initialise it.
464 dev_irnet_open(struct inode * inode,
467 struct irnet_socket * ap;
470 DENTER(FS_TRACE, "(file=0x%p)\n", file);
472 #ifdef SECURE_DEVIRNET
473 /* This could (should?) be enforced by the permissions on /dev/irnet. */
474 if(!capable(CAP_NET_ADMIN))
476 #endif /* SECURE_DEVIRNET */
478 /* Allocate a private structure for this IrNET instance */
479 ap = kzalloc(sizeof(*ap), GFP_KERNEL);
480 DABORT(ap == NULL, -ENOMEM, FS_ERROR, "Can't allocate struct irnet...\n");
483 /* initialize the irnet structure */
486 /* PPP channel setup */
488 ap->chan.private = ap;
489 ap->chan.ops = &irnet_ppp_ops;
490 ap->chan.mtu = (2048 - TTP_MAX_HEADER - 2 - PPP_HDRLEN);
491 ap->chan.hdrlen = 2 + TTP_MAX_HEADER; /* for A/C + Max IrDA hdr */
493 ap->mru = (2048 - TTP_MAX_HEADER - 2 - PPP_HDRLEN);
495 ap->xaccm[3] = 0x60000000U;
498 /* Setup the IrDA part... */
499 err = irda_irnet_create(ap);
502 DERROR(FS_ERROR, "Can't setup IrDA link...\n");
508 /* For the control channel */
509 ap->event_index = irnet_events.index; /* Cancel all past events */
511 /* Put our stuff where we will be able to find it later */
512 file->private_data = ap;
514 DEXIT(FS_TRACE, " - ap=0x%p\n", ap);
520 /*------------------------------------------------------------------*/
522 * Close : when somebody close /dev/irnet
523 * Destroy the instance of /dev/irnet
526 dev_irnet_close(struct inode * inode,
529 irnet_socket * ap = (struct irnet_socket *) file->private_data;
531 DENTER(FS_TRACE, "(file=0x%p, ap=0x%p)\n",
533 DABORT(ap == NULL, 0, FS_ERROR, "ap is NULL !!!\n");
535 /* Detach ourselves */
536 file->private_data = NULL;
538 /* Close IrDA stuff */
539 irda_irnet_destroy(ap);
541 /* Disconnect from the generic PPP layer if not already done */
544 DERROR(FS_ERROR, "Channel still registered - deregistering !\n");
546 ppp_unregister_channel(&ap->chan);
551 DEXIT(FS_TRACE, "\n");
555 /*------------------------------------------------------------------*/
557 * Write does nothing.
558 * (we receive packet from ppp_generic through ppp_irnet_send())
561 dev_irnet_write(struct file * file,
562 const char __user *buf,
566 irnet_socket * ap = (struct irnet_socket *) file->private_data;
568 DPASS(FS_TRACE, "(file=0x%p, ap=0x%p, count=%Zd)\n",
570 DABORT(ap == NULL, -ENXIO, FS_ERROR, "ap is NULL !!!\n");
572 /* If we are connected to ppp_generic, let it handle the job */
576 return irnet_ctrl_write(ap, buf, count);
579 /*------------------------------------------------------------------*/
581 * Read doesn't do much either.
582 * (pppd poll us, but ultimately reads through /dev/ppp)
585 dev_irnet_read(struct file * file,
590 irnet_socket * ap = (struct irnet_socket *) file->private_data;
592 DPASS(FS_TRACE, "(file=0x%p, ap=0x%p, count=%Zd)\n",
594 DABORT(ap == NULL, -ENXIO, FS_ERROR, "ap is NULL !!!\n");
596 /* If we are connected to ppp_generic, let it handle the job */
600 return irnet_ctrl_read(ap, file, buf, count);
603 /*------------------------------------------------------------------*/
605 * Poll : called when someone do a select on /dev/irnet
608 dev_irnet_poll(struct file * file,
611 irnet_socket * ap = (struct irnet_socket *) file->private_data;
614 DENTER(FS_TRACE, "(file=0x%p, ap=0x%p)\n",
617 mask = POLLOUT | POLLWRNORM;
618 DABORT(ap == NULL, mask, FS_ERROR, "ap is NULL !!!\n");
620 /* If we are connected to ppp_generic, let it handle the job */
622 mask |= irnet_ctrl_poll(ap, file, wait);
624 DEXIT(FS_TRACE, " - mask=0x%X\n", mask);
628 /*------------------------------------------------------------------*/
630 * IOCtl : Called when someone does some ioctls on /dev/irnet
631 * This is the way pppd configure us and control us while the PPP
632 * instance is active.
635 dev_irnet_ioctl(struct inode * inode,
640 irnet_socket * ap = (struct irnet_socket *) file->private_data;
643 void __user *argp = (void __user *)arg;
645 DENTER(FS_TRACE, "(file=0x%p, ap=0x%p, cmd=0x%X)\n",
648 /* Basic checks... */
649 DASSERT(ap != NULL, -ENXIO, PPP_ERROR, "ap is NULL...\n");
650 #ifdef SECURE_DEVIRNET
651 if(!capable(CAP_NET_ADMIN))
653 #endif /* SECURE_DEVIRNET */
658 /* Set discipline (should be N_SYNC_PPP or N_TTY) */
660 if(get_user(val, (int __user *)argp))
662 if((val == N_SYNC_PPP) || (val == N_PPP))
664 DEBUG(FS_INFO, "Entering PPP discipline.\n");
665 /* PPP channel setup (ap->chan in configued in dev_irnet_open())*/
666 err = ppp_register_channel(&ap->chan);
669 /* Our ppp side is active */
672 DEBUG(FS_INFO, "Trying to establish a connection.\n");
673 /* Setup the IrDA link now - may fail... */
674 irda_irnet_connect(ap);
677 DERROR(FS_ERROR, "Can't setup PPP channel...\n");
681 /* In theory, should be N_TTY */
682 DEBUG(FS_INFO, "Exiting PPP discipline.\n");
683 /* Disconnect from the generic PPP layer */
687 ppp_unregister_channel(&ap->chan);
690 DERROR(FS_ERROR, "Channel not registered !\n");
695 /* Query PPP channel and unit number */
699 if(put_user(ppp_channel_index(&ap->chan), (int __user *)argp))
701 DEBUG(FS_INFO, "Query channel.\n");
707 if(put_user(ppp_unit_number(&ap->chan), (int __user *)argp))
709 DEBUG(FS_INFO, "Query unit number.\n");
713 /* All these ioctls can be passed both directly and from ppp_generic,
714 * so we just deal with them in one place...
718 case PPPIOCGASYNCMAP:
719 case PPPIOCSASYNCMAP:
720 case PPPIOCGRASYNCMAP:
721 case PPPIOCSRASYNCMAP:
722 case PPPIOCGXASYNCMAP:
723 case PPPIOCSXASYNCMAP:
726 DEBUG(FS_INFO, "Standard PPP ioctl.\n");
727 if(!capable(CAP_NET_ADMIN))
730 err = ppp_irnet_ioctl(&ap->chan, cmd, arg);
733 /* TTY IOCTLs : Pretend that we are a tty, to keep pppd happy */
736 DEBUG(FS_INFO, "Get termios.\n");
738 if(kernel_termios_to_user_termios((struct termios __user *)argp, &ap->termios))
741 if(kernel_termios_to_user_termios_1((struct termios __user *)argp, &ap->termios))
748 DEBUG(FS_INFO, "Set termios.\n");
750 if(user_termios_to_kernel_termios(&ap->termios, (struct termios __user *)argp))
753 if(user_termios_to_kernel_termios_1(&ap->termios, (struct termios __user *)argp))
762 /* Set exclusive/non-exclusive mode */
765 DEBUG(FS_INFO, "TTY compatibility.\n");
770 DEBUG(FS_INFO, "TCGETA\n");
774 DEBUG(FS_INFO, "TCFLSH\n");
775 /* Note : this will flush buffers in PPP, so it *must* be done
776 * We should also worry that we don't accept junk here and that
777 * we get rid of our own buffers */
779 ppp_output_wakeup(&ap->chan);
780 #endif /* FLUSH_TO_PPP */
785 DEBUG(FS_INFO, "FIONREAD\n");
787 if(put_user(val, (int __user *)argp))
793 DERROR(FS_ERROR, "Unsupported ioctl (0x%X)\n", cmd);
797 DEXIT(FS_TRACE, " - err = 0x%X\n", err);
801 /************************** PPP CALLBACKS **************************/
803 * This are the functions that the generic PPP driver in the kernel
804 * will call to communicate to us.
807 /*------------------------------------------------------------------*/
809 * Prepare the ppp frame for transmission over the IrDA socket.
810 * We make sure that the header space is enough, and we change ppp header
811 * according to flags passed by pppd.
812 * This is not a callback, but just a helper function used in ppp_irnet_send()
814 static inline struct sk_buff *
815 irnet_prepare_skb(irnet_socket * ap,
816 struct sk_buff * skb)
818 unsigned char * data;
819 int proto; /* PPP protocol */
820 int islcp; /* Protocol == LCP */
821 int needaddr; /* Need PPP address */
823 DENTER(PPP_TRACE, "(ap=0x%p, skb=0x%p)\n",
826 /* Extract PPP protocol from the frame */
828 proto = (data[0] << 8) + data[1];
830 /* LCP packets with codes between 1 (configure-request)
831 * and 7 (code-reject) must be sent as though no options
832 * have been negotiated. */
833 islcp = (proto == PPP_LCP) && (1 <= data[2]) && (data[2] <= 7);
835 /* compress protocol field if option enabled */
836 if((data[0] == 0) && (ap->flags & SC_COMP_PROT) && (!islcp))
839 /* Check if we need address/control fields */
840 needaddr = 2*((ap->flags & SC_COMP_AC) == 0 || islcp);
842 /* Is the skb headroom large enough to contain all IrDA-headers? */
843 if((skb_headroom(skb) < (ap->max_header_size + needaddr)) ||
846 struct sk_buff * new_skb;
848 DEBUG(PPP_INFO, "Reallocating skb\n");
850 /* Create a new skb */
851 new_skb = skb_realloc_headroom(skb, ap->max_header_size + needaddr);
853 /* We have to free the original skb anyway */
856 /* Did the realloc succeed ? */
857 DABORT(new_skb == NULL, NULL, PPP_ERROR, "Could not realloc skb\n");
859 /* Use the new skb instead */
863 /* prepend address/control fields if necessary */
867 skb->data[0] = PPP_ALLSTATIONS;
868 skb->data[1] = PPP_UI;
871 DEXIT(PPP_TRACE, "\n");
876 /*------------------------------------------------------------------*/
878 * Send a packet to the peer over the IrTTP connection.
879 * Returns 1 iff the packet was accepted.
880 * Returns 0 iff packet was not consumed.
881 * If the packet was not accepted, we will call ppp_output_wakeup
882 * at some later time to reactivate flow control in ppp_generic.
885 ppp_irnet_send(struct ppp_channel * chan,
886 struct sk_buff * skb)
888 irnet_socket * self = (struct irnet_socket *) chan->private;
891 DENTER(PPP_TRACE, "(channel=0x%p, ap/self=0x%p)\n",
894 /* Check if things are somewhat valid... */
895 DASSERT(self != NULL, 0, PPP_ERROR, "Self is NULL !!!\n");
897 /* Check if we are connected */
898 if(!(test_bit(0, &self->ttp_open)))
900 #ifdef CONNECT_IN_SEND
901 /* Let's try to connect one more time... */
902 /* Note : we won't be connected after this call, but we should be
903 * ready for next packet... */
904 /* If we are already connecting, this will fail */
905 irda_irnet_connect(self);
906 #endif /* CONNECT_IN_SEND */
908 DEBUG(PPP_INFO, "IrTTP not ready ! (%ld-%ld)\n",
909 self->ttp_open, self->ttp_connect);
911 /* Note : we can either drop the packet or block the packet.
913 * Blocking the packet allow us a better connection time,
914 * because by calling ppp_output_wakeup() we can have
915 * ppp_generic resending the LCP request immediately to us,
916 * rather than waiting for one of pppd periodic transmission of
919 * On the other hand, if we block all packet, all those periodic
920 * transmissions of pppd accumulate in ppp_generic, creating a
921 * backlog of LCP request. When we eventually connect later on,
922 * we have to transmit all this backlog before we can connect
923 * proper (if we don't timeout before).
925 * The current strategy is as follow :
926 * While we are attempting to connect, we block packets to get
927 * a better connection time.
928 * If we fail to connect, we drain the queue and start dropping packets
930 #ifdef BLOCK_WHEN_CONNECT
931 /* If we are attempting to connect */
932 if(test_bit(0, &self->ttp_connect))
934 /* Blocking packet, ppp_generic will retry later */
937 #endif /* BLOCK_WHEN_CONNECT */
939 /* Dropping packet, pppd will retry later */
944 /* Check if the queue can accept any packet, otherwise block */
945 if(self->tx_flow != FLOW_START)
946 DRETURN(0, PPP_INFO, "IrTTP queue full (%d skbs)...\n",
947 skb_queue_len(&self->tsap->tx_queue));
949 /* Prepare ppp frame for transmission */
950 skb = irnet_prepare_skb(self, skb);
951 DABORT(skb == NULL, 1, PPP_ERROR, "Prepare skb for Tx failed.\n");
953 /* Send the packet to IrTTP */
954 ret = irttp_data_request(self->tsap, skb);
958 * > IrTTPs tx queue is full, so we just have to
959 * > drop the frame! You might think that we should
960 * > just return -1 and don't deallocate the frame,
961 * > but that is dangerous since it's possible that
962 * > we have replaced the original skb with a new
963 * > one with larger headroom, and that would really
964 * > confuse do_dev_queue_xmit() in dev.c! I have
966 * Correction : we verify the flow control above (self->tx_flow),
967 * so we come here only if IrTTP doesn't like the packet (empty,
968 * too large, IrTTP not connected). In those rare cases, it's ok
969 * to drop it, we don't want to see it here again...
972 DERROR(PPP_ERROR, "IrTTP doesn't like this packet !!! (0x%X)\n", ret);
973 /* irttp_data_request already free the packet */
976 DEXIT(PPP_TRACE, "\n");
977 return 1; /* Packet has been consumed */
980 /*------------------------------------------------------------------*/
982 * Take care of the ioctls that ppp_generic doesn't want to deal with...
983 * Note : we are also called from dev_irnet_ioctl().
986 ppp_irnet_ioctl(struct ppp_channel * chan,
990 irnet_socket * ap = (struct irnet_socket *) chan->private;
994 void __user *argp = (void __user *)arg;
996 DENTER(PPP_TRACE, "(channel=0x%p, ap=0x%p, cmd=0x%X)\n",
999 /* Basic checks... */
1000 DASSERT(ap != NULL, -ENXIO, PPP_ERROR, "ap is NULL...\n");
1007 val = ap->flags | ap->rbits;
1008 if(put_user(val, (int __user *) argp))
1013 if(get_user(val, (int __user *) argp))
1015 ap->flags = val & ~SC_RCV_BITS;
1016 ap->rbits = val & SC_RCV_BITS;
1020 /* Async map stuff - all dummy to please pppd */
1021 case PPPIOCGASYNCMAP:
1022 if(put_user(ap->xaccm[0], (u32 __user *) argp))
1026 case PPPIOCSASYNCMAP:
1027 if(get_user(ap->xaccm[0], (u32 __user *) argp))
1031 case PPPIOCGRASYNCMAP:
1032 if(put_user(ap->raccm, (u32 __user *) argp))
1036 case PPPIOCSRASYNCMAP:
1037 if(get_user(ap->raccm, (u32 __user *) argp))
1041 case PPPIOCGXASYNCMAP:
1042 if(copy_to_user(argp, ap->xaccm, sizeof(ap->xaccm)))
1046 case PPPIOCSXASYNCMAP:
1047 if(copy_from_user(accm, argp, sizeof(accm)))
1049 accm[2] &= ~0x40000000U; /* can't escape 0x5e */
1050 accm[3] |= 0x60000000U; /* must escape 0x7d, 0x7e */
1051 memcpy(ap->xaccm, accm, sizeof(ap->xaccm));
1055 /* Max PPP frame size */
1057 if(put_user(ap->mru, (int __user *) argp))
1062 if(get_user(val, (int __user *) argp))
1071 DEBUG(PPP_INFO, "Unsupported ioctl (0x%X)\n", cmd);
1075 DEXIT(PPP_TRACE, " - err = 0x%X\n", err);
1079 /************************** INITIALISATION **************************/
1081 * Module initialisation and all that jazz...
1084 /*------------------------------------------------------------------*/
1086 * Hook our device callbacks in the filesystem, to connect our code
1089 static inline int __init
1090 ppp_irnet_init(void)
1094 DENTER(MODULE_TRACE, "()\n");
1096 /* Allocate ourselves as a minor in the misc range */
1097 err = misc_register(&irnet_misc_device);
1099 DEXIT(MODULE_TRACE, "\n");
1103 /*------------------------------------------------------------------*/
1105 * Cleanup at exit...
1107 static inline void __exit
1108 ppp_irnet_cleanup(void)
1110 DENTER(MODULE_TRACE, "()\n");
1112 /* De-allocate /dev/irnet minor in misc range */
1113 misc_deregister(&irnet_misc_device);
1115 DEXIT(MODULE_TRACE, "\n");
1118 /*------------------------------------------------------------------*/
1120 * Module main entry point
1127 /* Initialise both parts... */
1128 err = irda_irnet_init();
1130 err = ppp_irnet_init();
1134 /*------------------------------------------------------------------*/
1141 irda_irnet_cleanup();
1142 ppp_irnet_cleanup();
1145 /*------------------------------------------------------------------*/
1149 module_init(irnet_init);
1150 module_exit(irnet_cleanup);
1151 MODULE_AUTHOR("Jean Tourrilhes <jt@hpl.hp.com>");
1152 MODULE_DESCRIPTION("IrNET : Synchronous PPP over IrDA");
1153 MODULE_LICENSE("GPL");
1154 MODULE_ALIAS_CHARDEV(10, 187);