Root/drivers/net/ppp_synctty.c

1/*
2 * PPP synchronous tty channel driver for Linux.
3 *
4 * This is a ppp channel driver that can be used with tty device drivers
5 * that are frame oriented, such as synchronous HDLC devices.
6 *
7 * Complete PPP frames without encoding/decoding are exchanged between
8 * the channel driver and the device driver.
9 *
10 * The async map IOCTL codes are implemented to keep the user mode
11 * applications happy if they call them. Synchronous PPP does not use
12 * the async maps.
13 *
14 * Copyright 1999 Paul Mackerras.
15 *
16 * Also touched by the grubby hands of Paul Fulghum paulkf@microgate.com
17 *
18 * This program is free software; you can redistribute it and/or
19 * modify it under the terms of the GNU General Public License
20 * as published by the Free Software Foundation; either version
21 * 2 of the License, or (at your option) any later version.
22 *
23 * This driver provides the encapsulation and framing for sending
24 * and receiving PPP frames over sync serial lines. It relies on
25 * the generic PPP layer to give it frames to send and to process
26 * received frames. It implements the PPP line discipline.
27 *
28 * Part of the code in this driver was inspired by the old async-only
29 * PPP driver, written by Michael Callahan and Al Longyear, and
30 * subsequently hacked by Paul Mackerras.
31 *
32 * ==FILEVERSION 20040616==
33 */
34
35#include <linux/module.h>
36#include <linux/kernel.h>
37#include <linux/skbuff.h>
38#include <linux/tty.h>
39#include <linux/netdevice.h>
40#include <linux/poll.h>
41#include <linux/ppp_defs.h>
42#include <linux/if_ppp.h>
43#include <linux/ppp_channel.h>
44#include <linux/spinlock.h>
45#include <linux/completion.h>
46#include <linux/init.h>
47#include <asm/uaccess.h>
48
49#define PPP_VERSION "2.4.2"
50
51/* Structure for storing local state. */
52struct syncppp {
53    struct tty_struct *tty;
54    unsigned int flags;
55    unsigned int rbits;
56    int mru;
57    spinlock_t xmit_lock;
58    spinlock_t recv_lock;
59    unsigned long xmit_flags;
60    u32 xaccm[8];
61    u32 raccm;
62    unsigned int bytes_sent;
63    unsigned int bytes_rcvd;
64
65    struct sk_buff *tpkt;
66    unsigned long last_xmit;
67
68    struct sk_buff_head rqueue;
69
70    struct tasklet_struct tsk;
71
72    atomic_t refcnt;
73    struct completion dead_cmp;
74    struct ppp_channel chan; /* interface to generic ppp layer */
75};
76
77/* Bit numbers in xmit_flags */
78#define XMIT_WAKEUP 0
79#define XMIT_FULL 1
80
81/* Bits in rbits */
82#define SC_RCV_BITS (SC_RCV_B7_1|SC_RCV_B7_0|SC_RCV_ODDP|SC_RCV_EVNP)
83
84#define PPPSYNC_MAX_RQLEN 32 /* arbitrary */
85
86/*
87 * Prototypes.
88 */
89static struct sk_buff* ppp_sync_txmunge(struct syncppp *ap, struct sk_buff *);
90static int ppp_sync_send(struct ppp_channel *chan, struct sk_buff *skb);
91static int ppp_sync_ioctl(struct ppp_channel *chan, unsigned int cmd,
92              unsigned long arg);
93static void ppp_sync_process(unsigned long arg);
94static int ppp_sync_push(struct syncppp *ap);
95static void ppp_sync_flush_output(struct syncppp *ap);
96static void ppp_sync_input(struct syncppp *ap, const unsigned char *buf,
97               char *flags, int count);
98
99static struct ppp_channel_ops sync_ops = {
100    ppp_sync_send,
101    ppp_sync_ioctl
102};
103
104/*
105 * Utility procedures to print a buffer in hex/ascii
106 */
107static void
108ppp_print_hex (register __u8 * out, const __u8 * in, int count)
109{
110    register __u8 next_ch;
111    static const char hex[] = "0123456789ABCDEF";
112
113    while (count-- > 0) {
114        next_ch = *in++;
115        *out++ = hex[(next_ch >> 4) & 0x0F];
116        *out++ = hex[next_ch & 0x0F];
117        ++out;
118    }
119}
120
121static void
122ppp_print_char (register __u8 * out, const __u8 * in, int count)
123{
124    register __u8 next_ch;
125
126    while (count-- > 0) {
127        next_ch = *in++;
128
129        if (next_ch < 0x20 || next_ch > 0x7e)
130            *out++ = '.';
131        else {
132            *out++ = next_ch;
133            if (next_ch == '%') /* printk/syslogd has a bug !! */
134                *out++ = '%';
135        }
136    }
137    *out = '\0';
138}
139
140static void
141ppp_print_buffer (const char *name, const __u8 *buf, int count)
142{
143    __u8 line[44];
144
145    if (name != NULL)
146        printk(KERN_DEBUG "ppp_synctty: %s, count = %d\n", name, count);
147
148    while (count > 8) {
149        memset (line, 32, 44);
150        ppp_print_hex (line, buf, 8);
151        ppp_print_char (&line[8 * 3], buf, 8);
152        printk(KERN_DEBUG "%s\n", line);
153        count -= 8;
154        buf += 8;
155    }
156
157    if (count > 0) {
158        memset (line, 32, 44);
159        ppp_print_hex (line, buf, count);
160        ppp_print_char (&line[8 * 3], buf, count);
161        printk(KERN_DEBUG "%s\n", line);
162    }
163}
164
165
166/*
167 * Routines implementing the synchronous PPP line discipline.
168 */
169
170/*
171 * We have a potential race on dereferencing tty->disc_data,
172 * because the tty layer provides no locking at all - thus one
173 * cpu could be running ppp_synctty_receive while another
174 * calls ppp_synctty_close, which zeroes tty->disc_data and
175 * frees the memory that ppp_synctty_receive is using. The best
176 * way to fix this is to use a rwlock in the tty struct, but for now
177 * we use a single global rwlock for all ttys in ppp line discipline.
178 *
179 * FIXME: Fixed in tty_io nowdays.
180 */
181static DEFINE_RWLOCK(disc_data_lock);
182
183static struct syncppp *sp_get(struct tty_struct *tty)
184{
185    struct syncppp *ap;
186
187    read_lock(&disc_data_lock);
188    ap = tty->disc_data;
189    if (ap != NULL)
190        atomic_inc(&ap->refcnt);
191    read_unlock(&disc_data_lock);
192    return ap;
193}
194
195static void sp_put(struct syncppp *ap)
196{
197    if (atomic_dec_and_test(&ap->refcnt))
198        complete(&ap->dead_cmp);
199}
200
201/*
202 * Called when a tty is put into sync-PPP line discipline.
203 */
204static int
205ppp_sync_open(struct tty_struct *tty)
206{
207    struct syncppp *ap;
208    int err;
209    int speed;
210
211    if (tty->ops->write == NULL)
212        return -EOPNOTSUPP;
213
214    ap = kzalloc(sizeof(*ap), GFP_KERNEL);
215    err = -ENOMEM;
216    if (!ap)
217        goto out;
218
219    /* initialize the syncppp structure */
220    ap->tty = tty;
221    ap->mru = PPP_MRU;
222    spin_lock_init(&ap->xmit_lock);
223    spin_lock_init(&ap->recv_lock);
224    ap->xaccm[0] = ~0U;
225    ap->xaccm[3] = 0x60000000U;
226    ap->raccm = ~0U;
227
228    skb_queue_head_init(&ap->rqueue);
229    tasklet_init(&ap->tsk, ppp_sync_process, (unsigned long) ap);
230
231    atomic_set(&ap->refcnt, 1);
232    init_completion(&ap->dead_cmp);
233
234    ap->chan.private = ap;
235    ap->chan.ops = &sync_ops;
236    ap->chan.mtu = PPP_MRU;
237    ap->chan.hdrlen = 2; /* for A/C bytes */
238    speed = tty_get_baud_rate(tty);
239    ap->chan.speed = speed;
240    err = ppp_register_channel(&ap->chan);
241    if (err)
242        goto out_free;
243
244    tty->disc_data = ap;
245    tty->receive_room = 65536;
246    return 0;
247
248 out_free:
249    kfree(ap);
250 out:
251    return err;
252}
253
254/*
255 * Called when the tty is put into another line discipline
256 * or it hangs up. We have to wait for any cpu currently
257 * executing in any of the other ppp_synctty_* routines to
258 * finish before we can call ppp_unregister_channel and free
259 * the syncppp struct. This routine must be called from
260 * process context, not interrupt or softirq context.
261 */
262static void
263ppp_sync_close(struct tty_struct *tty)
264{
265    struct syncppp *ap;
266
267    write_lock_irq(&disc_data_lock);
268    ap = tty->disc_data;
269    tty->disc_data = NULL;
270    write_unlock_irq(&disc_data_lock);
271    if (!ap)
272        return;
273
274    /*
275     * We have now ensured that nobody can start using ap from now
276     * on, but we have to wait for all existing users to finish.
277     * Note that ppp_unregister_channel ensures that no calls to
278     * our channel ops (i.e. ppp_sync_send/ioctl) are in progress
279     * by the time it returns.
280     */
281    if (!atomic_dec_and_test(&ap->refcnt))
282        wait_for_completion(&ap->dead_cmp);
283    tasklet_kill(&ap->tsk);
284
285    ppp_unregister_channel(&ap->chan);
286    skb_queue_purge(&ap->rqueue);
287    kfree_skb(ap->tpkt);
288    kfree(ap);
289}
290
291/*
292 * Called on tty hangup in process context.
293 *
294 * Wait for I/O to driver to complete and unregister PPP channel.
295 * This is already done by the close routine, so just call that.
296 */
297static int ppp_sync_hangup(struct tty_struct *tty)
298{
299    ppp_sync_close(tty);
300    return 0;
301}
302
303/*
304 * Read does nothing - no data is ever available this way.
305 * Pppd reads and writes packets via /dev/ppp instead.
306 */
307static ssize_t
308ppp_sync_read(struct tty_struct *tty, struct file *file,
309           unsigned char __user *buf, size_t count)
310{
311    return -EAGAIN;
312}
313
314/*
315 * Write on the tty does nothing, the packets all come in
316 * from the ppp generic stuff.
317 */
318static ssize_t
319ppp_sync_write(struct tty_struct *tty, struct file *file,
320        const unsigned char *buf, size_t count)
321{
322    return -EAGAIN;
323}
324
325static int
326ppp_synctty_ioctl(struct tty_struct *tty, struct file *file,
327          unsigned int cmd, unsigned long arg)
328{
329    struct syncppp *ap = sp_get(tty);
330    int __user *p = (int __user *)arg;
331    int err, val;
332
333    if (!ap)
334        return -ENXIO;
335    err = -EFAULT;
336    switch (cmd) {
337    case PPPIOCGCHAN:
338        err = -EFAULT;
339        if (put_user(ppp_channel_index(&ap->chan), p))
340            break;
341        err = 0;
342        break;
343
344    case PPPIOCGUNIT:
345        err = -EFAULT;
346        if (put_user(ppp_unit_number(&ap->chan), p))
347            break;
348        err = 0;
349        break;
350
351    case TCFLSH:
352        /* flush our buffers and the serial port's buffer */
353        if (arg == TCIOFLUSH || arg == TCOFLUSH)
354            ppp_sync_flush_output(ap);
355        err = tty_perform_flush(tty, arg);
356        break;
357
358    case FIONREAD:
359        val = 0;
360        if (put_user(val, p))
361            break;
362        err = 0;
363        break;
364
365    default:
366        err = tty_mode_ioctl(tty, file, cmd, arg);
367        break;
368    }
369
370    sp_put(ap);
371    return err;
372}
373
374/* No kernel lock - fine */
375static unsigned int
376ppp_sync_poll(struct tty_struct *tty, struct file *file, poll_table *wait)
377{
378    return 0;
379}
380
381/*
382 * This can now be called from hard interrupt level as well
383 * as soft interrupt level or mainline.
384 */
385static void
386ppp_sync_receive(struct tty_struct *tty, const unsigned char *buf,
387          char *cflags, int count)
388{
389    struct syncppp *ap = sp_get(tty);
390    unsigned long flags;
391
392    if (!ap)
393        return;
394    spin_lock_irqsave(&ap->recv_lock, flags);
395    ppp_sync_input(ap, buf, cflags, count);
396    spin_unlock_irqrestore(&ap->recv_lock, flags);
397    if (!skb_queue_empty(&ap->rqueue))
398        tasklet_schedule(&ap->tsk);
399    sp_put(ap);
400    tty_unthrottle(tty);
401}
402
403static void
404ppp_sync_wakeup(struct tty_struct *tty)
405{
406    struct syncppp *ap = sp_get(tty);
407
408    clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
409    if (!ap)
410        return;
411    set_bit(XMIT_WAKEUP, &ap->xmit_flags);
412    tasklet_schedule(&ap->tsk);
413    sp_put(ap);
414}
415
416
417static struct tty_ldisc_ops ppp_sync_ldisc = {
418    .owner = THIS_MODULE,
419    .magic = TTY_LDISC_MAGIC,
420    .name = "pppsync",
421    .open = ppp_sync_open,
422    .close = ppp_sync_close,
423    .hangup = ppp_sync_hangup,
424    .read = ppp_sync_read,
425    .write = ppp_sync_write,
426    .ioctl = ppp_synctty_ioctl,
427    .poll = ppp_sync_poll,
428    .receive_buf = ppp_sync_receive,
429    .write_wakeup = ppp_sync_wakeup,
430};
431
432static int __init
433ppp_sync_init(void)
434{
435    int err;
436
437    err = tty_register_ldisc(N_SYNC_PPP, &ppp_sync_ldisc);
438    if (err != 0)
439        printk(KERN_ERR "PPP_sync: error %d registering line disc.\n",
440               err);
441    return err;
442}
443
444/*
445 * The following routines provide the PPP channel interface.
446 */
447static int
448ppp_sync_ioctl(struct ppp_channel *chan, unsigned int cmd, unsigned long arg)
449{
450    struct syncppp *ap = chan->private;
451    int err, val;
452    u32 accm[8];
453    void __user *argp = (void __user *)arg;
454    u32 __user *p = argp;
455
456    err = -EFAULT;
457    switch (cmd) {
458    case PPPIOCGFLAGS:
459        val = ap->flags | ap->rbits;
460        if (put_user(val, (int __user *) argp))
461            break;
462        err = 0;
463        break;
464    case PPPIOCSFLAGS:
465        if (get_user(val, (int __user *) argp))
466            break;
467        ap->flags = val & ~SC_RCV_BITS;
468        spin_lock_irq(&ap->recv_lock);
469        ap->rbits = val & SC_RCV_BITS;
470        spin_unlock_irq(&ap->recv_lock);
471        err = 0;
472        break;
473
474    case PPPIOCGASYNCMAP:
475        if (put_user(ap->xaccm[0], p))
476            break;
477        err = 0;
478        break;
479    case PPPIOCSASYNCMAP:
480        if (get_user(ap->xaccm[0], p))
481            break;
482        err = 0;
483        break;
484
485    case PPPIOCGRASYNCMAP:
486        if (put_user(ap->raccm, p))
487            break;
488        err = 0;
489        break;
490    case PPPIOCSRASYNCMAP:
491        if (get_user(ap->raccm, p))
492            break;
493        err = 0;
494        break;
495
496    case PPPIOCGXASYNCMAP:
497        if (copy_to_user(argp, ap->xaccm, sizeof(ap->xaccm)))
498            break;
499        err = 0;
500        break;
501    case PPPIOCSXASYNCMAP:
502        if (copy_from_user(accm, argp, sizeof(accm)))
503            break;
504        accm[2] &= ~0x40000000U; /* can't escape 0x5e */
505        accm[3] |= 0x60000000U; /* must escape 0x7d, 0x7e */
506        memcpy(ap->xaccm, accm, sizeof(ap->xaccm));
507        err = 0;
508        break;
509
510    case PPPIOCGMRU:
511        if (put_user(ap->mru, (int __user *) argp))
512            break;
513        err = 0;
514        break;
515    case PPPIOCSMRU:
516        if (get_user(val, (int __user *) argp))
517            break;
518        if (val < PPP_MRU)
519            val = PPP_MRU;
520        ap->mru = val;
521        err = 0;
522        break;
523
524    default:
525        err = -ENOTTY;
526    }
527    return err;
528}
529
530/*
531 * This is called at softirq level to deliver received packets
532 * to the ppp_generic code, and to tell the ppp_generic code
533 * if we can accept more output now.
534 */
535static void ppp_sync_process(unsigned long arg)
536{
537    struct syncppp *ap = (struct syncppp *) arg;
538    struct sk_buff *skb;
539
540    /* process received packets */
541    while ((skb = skb_dequeue(&ap->rqueue)) != NULL) {
542        if (skb->len == 0) {
543            /* zero length buffers indicate error */
544            ppp_input_error(&ap->chan, 0);
545            kfree_skb(skb);
546        }
547        else
548            ppp_input(&ap->chan, skb);
549    }
550
551    /* try to push more stuff out */
552    if (test_bit(XMIT_WAKEUP, &ap->xmit_flags) && ppp_sync_push(ap))
553        ppp_output_wakeup(&ap->chan);
554}
555
556/*
557 * Procedures for encapsulation and framing.
558 */
559
560static struct sk_buff*
561ppp_sync_txmunge(struct syncppp *ap, struct sk_buff *skb)
562{
563    int proto;
564    unsigned char *data;
565    int islcp;
566
567    data = skb->data;
568    proto = (data[0] << 8) + data[1];
569
570    /* LCP packets with codes between 1 (configure-request)
571     * and 7 (code-reject) must be sent as though no options
572     * have been negotiated.
573     */
574    islcp = proto == PPP_LCP && 1 <= data[2] && data[2] <= 7;
575
576    /* compress protocol field if option enabled */
577    if (data[0] == 0 && (ap->flags & SC_COMP_PROT) && !islcp)
578        skb_pull(skb,1);
579
580    /* prepend address/control fields if necessary */
581    if ((ap->flags & SC_COMP_AC) == 0 || islcp) {
582        if (skb_headroom(skb) < 2) {
583            struct sk_buff *npkt = dev_alloc_skb(skb->len + 2);
584            if (npkt == NULL) {
585                kfree_skb(skb);
586                return NULL;
587            }
588            skb_reserve(npkt,2);
589            skb_copy_from_linear_data(skb,
590                      skb_put(npkt, skb->len), skb->len);
591            kfree_skb(skb);
592            skb = npkt;
593        }
594        skb_push(skb,2);
595        skb->data[0] = PPP_ALLSTATIONS;
596        skb->data[1] = PPP_UI;
597    }
598
599    ap->last_xmit = jiffies;
600
601    if (skb && ap->flags & SC_LOG_OUTPKT)
602        ppp_print_buffer ("send buffer", skb->data, skb->len);
603
604    return skb;
605}
606
607/*
608 * Transmit-side routines.
609 */
610
611/*
612 * Send a packet to the peer over an sync tty line.
613 * Returns 1 iff the packet was accepted.
614 * If the packet was not accepted, we will call ppp_output_wakeup
615 * at some later time.
616 */
617static int
618ppp_sync_send(struct ppp_channel *chan, struct sk_buff *skb)
619{
620    struct syncppp *ap = chan->private;
621
622    ppp_sync_push(ap);
623
624    if (test_and_set_bit(XMIT_FULL, &ap->xmit_flags))
625        return 0; /* already full */
626    skb = ppp_sync_txmunge(ap, skb);
627    if (skb != NULL)
628        ap->tpkt = skb;
629    else
630        clear_bit(XMIT_FULL, &ap->xmit_flags);
631
632    ppp_sync_push(ap);
633    return 1;
634}
635
636/*
637 * Push as much data as possible out to the tty.
638 */
639static int
640ppp_sync_push(struct syncppp *ap)
641{
642    int sent, done = 0;
643    struct tty_struct *tty = ap->tty;
644    int tty_stuffed = 0;
645
646    if (!spin_trylock_bh(&ap->xmit_lock))
647        return 0;
648    for (;;) {
649        if (test_and_clear_bit(XMIT_WAKEUP, &ap->xmit_flags))
650            tty_stuffed = 0;
651        if (!tty_stuffed && ap->tpkt) {
652            set_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
653            sent = tty->ops->write(tty, ap->tpkt->data, ap->tpkt->len);
654            if (sent < 0)
655                goto flush; /* error, e.g. loss of CD */
656            if (sent < ap->tpkt->len) {
657                tty_stuffed = 1;
658            } else {
659                kfree_skb(ap->tpkt);
660                ap->tpkt = NULL;
661                clear_bit(XMIT_FULL, &ap->xmit_flags);
662                done = 1;
663            }
664            continue;
665        }
666        /* haven't made any progress */
667        spin_unlock_bh(&ap->xmit_lock);
668        if (!(test_bit(XMIT_WAKEUP, &ap->xmit_flags)
669              || (!tty_stuffed && ap->tpkt)))
670            break;
671        if (!spin_trylock_bh(&ap->xmit_lock))
672            break;
673    }
674    return done;
675
676flush:
677    if (ap->tpkt) {
678        kfree_skb(ap->tpkt);
679        ap->tpkt = NULL;
680        clear_bit(XMIT_FULL, &ap->xmit_flags);
681        done = 1;
682    }
683    spin_unlock_bh(&ap->xmit_lock);
684    return done;
685}
686
687/*
688 * Flush output from our internal buffers.
689 * Called for the TCFLSH ioctl.
690 */
691static void
692ppp_sync_flush_output(struct syncppp *ap)
693{
694    int done = 0;
695
696    spin_lock_bh(&ap->xmit_lock);
697    if (ap->tpkt != NULL) {
698        kfree_skb(ap->tpkt);
699        ap->tpkt = NULL;
700        clear_bit(XMIT_FULL, &ap->xmit_flags);
701        done = 1;
702    }
703    spin_unlock_bh(&ap->xmit_lock);
704    if (done)
705        ppp_output_wakeup(&ap->chan);
706}
707
708/*
709 * Receive-side routines.
710 */
711
712/* called when the tty driver has data for us.
713 *
714 * Data is frame oriented: each call to ppp_sync_input is considered
715 * a whole frame. If the 1st flag byte is non-zero then the whole
716 * frame is considered to be in error and is tossed.
717 */
718static void
719ppp_sync_input(struct syncppp *ap, const unsigned char *buf,
720        char *flags, int count)
721{
722    struct sk_buff *skb;
723    unsigned char *p;
724
725    if (count == 0)
726        return;
727
728    if (ap->flags & SC_LOG_INPKT)
729        ppp_print_buffer ("receive buffer", buf, count);
730
731    /* stuff the chars in the skb */
732    skb = dev_alloc_skb(ap->mru + PPP_HDRLEN + 2);
733    if (!skb) {
734        printk(KERN_ERR "PPPsync: no memory (input pkt)\n");
735        goto err;
736    }
737    /* Try to get the payload 4-byte aligned */
738    if (buf[0] != PPP_ALLSTATIONS)
739        skb_reserve(skb, 2 + (buf[0] & 1));
740
741    if (flags && *flags) {
742        /* error flag set, ignore frame */
743        goto err;
744    } else if (count > skb_tailroom(skb)) {
745        /* packet overflowed MRU */
746        goto err;
747    }
748
749    p = skb_put(skb, count);
750    memcpy(p, buf, count);
751
752    /* strip address/control field if present */
753    p = skb->data;
754    if (p[0] == PPP_ALLSTATIONS && p[1] == PPP_UI) {
755        /* chop off address/control */
756        if (skb->len < 3)
757            goto err;
758        p = skb_pull(skb, 2);
759    }
760
761    /* decompress protocol field if compressed */
762    if (p[0] & 1) {
763        /* protocol is compressed */
764        skb_push(skb, 1)[0] = 0;
765    } else if (skb->len < 2)
766        goto err;
767
768    /* queue the frame to be processed */
769    skb_queue_tail(&ap->rqueue, skb);
770    return;
771
772err:
773    /* queue zero length packet as error indication */
774    if (skb || (skb = dev_alloc_skb(0))) {
775        skb_trim(skb, 0);
776        skb_queue_tail(&ap->rqueue, skb);
777    }
778}
779
780static void __exit
781ppp_sync_cleanup(void)
782{
783    if (tty_unregister_ldisc(N_SYNC_PPP) != 0)
784        printk(KERN_ERR "failed to unregister Sync PPP line discipline\n");
785}
786
787module_init(ppp_sync_init);
788module_exit(ppp_sync_cleanup);
789MODULE_LICENSE("GPL");
790MODULE_ALIAS_LDISC(N_SYNC_PPP);
791

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