Lines Matching +full:packet +full:- +full:oriented
1 // SPDX-License-Identifier: GPL-2.0-or-later
6 * that are frame oriented, such as synchronous HDLC devices.
24 * Part of the code in this driver was inspired by the old async-only
38 #include <linux/ppp-ioctl.h>
122 * We have a potential race on dereferencing tty->disc_data,
123 * because the tty layer provides no locking at all - thus one
125 * calls ppp_synctty_close, which zeroes tty->disc_data and
139 ap = tty->disc_data; in sp_get()
141 refcount_inc(&ap->refcnt); in sp_get()
148 if (refcount_dec_and_test(&ap->refcnt)) in sp_put()
149 complete(&ap->dead_cmp); in sp_put()
153 * Called when a tty is put into sync-PPP line discipline.
162 if (tty->ops->write == NULL) in ppp_sync_open()
163 return -EOPNOTSUPP; in ppp_sync_open()
166 err = -ENOMEM; in ppp_sync_open()
171 ap->tty = tty; in ppp_sync_open()
172 ap->mru = PPP_MRU; in ppp_sync_open()
173 spin_lock_init(&ap->xmit_lock); in ppp_sync_open()
174 spin_lock_init(&ap->recv_lock); in ppp_sync_open()
175 ap->xaccm[0] = ~0U; in ppp_sync_open()
176 ap->xaccm[3] = 0x60000000U; in ppp_sync_open()
177 ap->raccm = ~0U; in ppp_sync_open()
179 skb_queue_head_init(&ap->rqueue); in ppp_sync_open()
180 tasklet_setup(&ap->tsk, ppp_sync_process); in ppp_sync_open()
182 refcount_set(&ap->refcnt, 1); in ppp_sync_open()
183 init_completion(&ap->dead_cmp); in ppp_sync_open()
185 ap->chan.private = ap; in ppp_sync_open()
186 ap->chan.ops = &sync_ops; in ppp_sync_open()
187 ap->chan.mtu = PPP_MRU; in ppp_sync_open()
188 ap->chan.hdrlen = 2; /* for A/C bytes */ in ppp_sync_open()
190 ap->chan.speed = speed; in ppp_sync_open()
191 err = ppp_register_channel(&ap->chan); in ppp_sync_open()
195 tty->disc_data = ap; in ppp_sync_open()
196 tty->receive_room = 65536; in ppp_sync_open()
219 ap = tty->disc_data; in ppp_sync_close()
220 tty->disc_data = NULL; in ppp_sync_close()
232 if (!refcount_dec_and_test(&ap->refcnt)) in ppp_sync_close()
233 wait_for_completion(&ap->dead_cmp); in ppp_sync_close()
234 tasklet_kill(&ap->tsk); in ppp_sync_close()
236 ppp_unregister_channel(&ap->chan); in ppp_sync_close()
237 skb_queue_purge(&ap->rqueue); in ppp_sync_close()
238 kfree_skb(ap->tpkt); in ppp_sync_close()
254 * Read does nothing - no data is ever available this way.
261 return -EAGAIN; in ppp_sync_read()
272 return -EAGAIN; in ppp_sync_write()
283 return -ENXIO; in ppp_synctty_ioctl()
284 err = -EFAULT; in ppp_synctty_ioctl()
287 err = -EFAULT; in ppp_synctty_ioctl()
288 if (put_user(ppp_channel_index(&ap->chan), p)) in ppp_synctty_ioctl()
294 err = -EFAULT; in ppp_synctty_ioctl()
295 if (put_user(ppp_unit_number(&ap->chan), p)) in ppp_synctty_ioctl()
333 spin_lock_irqsave(&ap->recv_lock, flags); in ppp_sync_receive()
335 spin_unlock_irqrestore(&ap->recv_lock, flags); in ppp_sync_receive()
336 if (!skb_queue_empty(&ap->rqueue)) in ppp_sync_receive()
337 tasklet_schedule(&ap->tsk); in ppp_sync_receive()
347 clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags); in ppp_sync_wakeup()
350 set_bit(XMIT_WAKEUP, &ap->xmit_flags); in ppp_sync_wakeup()
351 tasklet_schedule(&ap->tsk); in ppp_sync_wakeup()
388 struct syncppp *ap = chan->private; in ppp_sync_ioctl()
394 err = -EFAULT; in ppp_sync_ioctl()
397 val = ap->flags | ap->rbits; in ppp_sync_ioctl()
405 ap->flags = val & ~SC_RCV_BITS; in ppp_sync_ioctl()
406 spin_lock_irq(&ap->recv_lock); in ppp_sync_ioctl()
407 ap->rbits = val & SC_RCV_BITS; in ppp_sync_ioctl()
408 spin_unlock_irq(&ap->recv_lock); in ppp_sync_ioctl()
413 if (put_user(ap->xaccm[0], p)) in ppp_sync_ioctl()
418 if (get_user(ap->xaccm[0], p)) in ppp_sync_ioctl()
424 if (put_user(ap->raccm, p)) in ppp_sync_ioctl()
429 if (get_user(ap->raccm, p)) in ppp_sync_ioctl()
435 if (copy_to_user(argp, ap->xaccm, sizeof(ap->xaccm))) in ppp_sync_ioctl()
444 memcpy(ap->xaccm, accm, sizeof(ap->xaccm)); in ppp_sync_ioctl()
449 if (put_user(ap->mru, (int __user *) argp)) in ppp_sync_ioctl()
457 err = -EINVAL; in ppp_sync_ioctl()
462 ap->mru = val; in ppp_sync_ioctl()
467 err = -ENOTTY; in ppp_sync_ioctl()
483 while ((skb = skb_dequeue(&ap->rqueue)) != NULL) { in ppp_sync_process()
484 if (skb->len == 0) { in ppp_sync_process()
486 ppp_input_error(&ap->chan, 0); in ppp_sync_process()
490 ppp_input(&ap->chan, skb); in ppp_sync_process()
494 if (test_bit(XMIT_WAKEUP, &ap->xmit_flags) && ppp_sync_push(ap)) in ppp_sync_process()
495 ppp_output_wakeup(&ap->chan); in ppp_sync_process()
514 data = skb->data; in ppp_sync_txmunge()
517 /* LCP packets with codes between 1 (configure-request) in ppp_sync_txmunge()
518 * and 7 (code-reject) must be sent as though no options in ppp_sync_txmunge()
524 if (data[0] == 0 && (ap->flags & SC_COMP_PROT) && !islcp) in ppp_sync_txmunge()
528 if ((ap->flags & SC_COMP_AC) == 0 || islcp) { in ppp_sync_txmunge()
530 struct sk_buff *npkt = dev_alloc_skb(skb->len + 2); in ppp_sync_txmunge()
537 skb_put(npkt, skb->len), skb->len); in ppp_sync_txmunge()
542 skb->data[0] = PPP_ALLSTATIONS; in ppp_sync_txmunge()
543 skb->data[1] = PPP_UI; in ppp_sync_txmunge()
546 ap->last_xmit = jiffies; in ppp_sync_txmunge()
548 if (skb && ap->flags & SC_LOG_OUTPKT) in ppp_sync_txmunge()
549 ppp_print_buffer ("send buffer", skb->data, skb->len); in ppp_sync_txmunge()
555 * Transmit-side routines.
559 * Send a packet to the peer over an sync tty line.
560 * Returns 1 iff the packet was accepted.
561 * If the packet was not accepted, we will call ppp_output_wakeup
567 struct syncppp *ap = chan->private; in ppp_sync_send()
571 if (test_and_set_bit(XMIT_FULL, &ap->xmit_flags)) in ppp_sync_send()
575 ap->tpkt = skb; in ppp_sync_send()
577 clear_bit(XMIT_FULL, &ap->xmit_flags); in ppp_sync_send()
590 struct tty_struct *tty = ap->tty; in ppp_sync_push()
593 if (!spin_trylock_bh(&ap->xmit_lock)) in ppp_sync_push()
596 if (test_and_clear_bit(XMIT_WAKEUP, &ap->xmit_flags)) in ppp_sync_push()
598 if (!tty_stuffed && ap->tpkt) { in ppp_sync_push()
599 set_bit(TTY_DO_WRITE_WAKEUP, &tty->flags); in ppp_sync_push()
600 sent = tty->ops->write(tty, ap->tpkt->data, ap->tpkt->len); in ppp_sync_push()
603 if (sent < ap->tpkt->len) { in ppp_sync_push()
606 consume_skb(ap->tpkt); in ppp_sync_push()
607 ap->tpkt = NULL; in ppp_sync_push()
608 clear_bit(XMIT_FULL, &ap->xmit_flags); in ppp_sync_push()
614 spin_unlock_bh(&ap->xmit_lock); in ppp_sync_push()
615 if (!(test_bit(XMIT_WAKEUP, &ap->xmit_flags) || in ppp_sync_push()
616 (!tty_stuffed && ap->tpkt))) in ppp_sync_push()
618 if (!spin_trylock_bh(&ap->xmit_lock)) in ppp_sync_push()
624 if (ap->tpkt) { in ppp_sync_push()
625 kfree_skb(ap->tpkt); in ppp_sync_push()
626 ap->tpkt = NULL; in ppp_sync_push()
627 clear_bit(XMIT_FULL, &ap->xmit_flags); in ppp_sync_push()
630 spin_unlock_bh(&ap->xmit_lock); in ppp_sync_push()
643 spin_lock_bh(&ap->xmit_lock); in ppp_sync_flush_output()
644 if (ap->tpkt != NULL) { in ppp_sync_flush_output()
645 kfree_skb(ap->tpkt); in ppp_sync_flush_output()
646 ap->tpkt = NULL; in ppp_sync_flush_output()
647 clear_bit(XMIT_FULL, &ap->xmit_flags); in ppp_sync_flush_output()
650 spin_unlock_bh(&ap->xmit_lock); in ppp_sync_flush_output()
652 ppp_output_wakeup(&ap->chan); in ppp_sync_flush_output()
656 * Receive-side routines.
661 * Data is frame oriented: each call to ppp_sync_input is considered
662 * a whole frame. If the 1st flag byte is non-zero then the whole
674 if (ap->flags & SC_LOG_INPKT) in ppp_sync_input()
678 skb = dev_alloc_skb(ap->mru + PPP_HDRLEN + 2); in ppp_sync_input()
683 /* Try to get the payload 4-byte aligned */ in ppp_sync_input()
691 /* packet overflowed MRU */ in ppp_sync_input()
698 p = skb->data; in ppp_sync_input()
699 if (skb->len >= 2 && p[0] == PPP_ALLSTATIONS && p[1] == PPP_UI) { in ppp_sync_input()
701 if (skb->len < 3) in ppp_sync_input()
706 /* PPP packet length should be >= 2 bytes when protocol field is not in ppp_sync_input()
709 if (!(p[0] & 0x01) && skb->len < 2) in ppp_sync_input()
713 skb_queue_tail(&ap->rqueue, skb); in ppp_sync_input()
717 /* queue zero length packet as error indication */ in ppp_sync_input()
720 skb_queue_tail(&ap->rqueue, skb); in ppp_sync_input()