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path: root/drivers/net/ppp/ppp_async.c
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Diffstat (limited to 'drivers/net/ppp/ppp_async.c')
-rw-r--r--drivers/net/ppp/ppp_async.c85
1 files changed, 37 insertions, 48 deletions
diff --git a/drivers/net/ppp/ppp_async.c b/drivers/net/ppp/ppp_async.c
index b287bb811875..c97406c6004d 100644
--- a/drivers/net/ppp/ppp_async.c
+++ b/drivers/net/ppp/ppp_async.c
@@ -1,13 +1,9 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
/*
* PPP async serial channel driver for Linux.
*
* Copyright 1999 Paul Mackerras.
*
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
- *
* This driver provides the encapsulation and framing for sending
* and receiving PPP frames over async serial lines. It relies on
* the generic PPP layer to give it frames to send and to process
@@ -33,7 +29,7 @@
#include <linux/interrupt.h>
#include <linux/jiffies.h>
#include <linux/slab.h>
-#include <asm/unaligned.h>
+#include <linux/unaligned.h>
#include <linux/uaccess.h>
#include <asm/string.h>
@@ -91,6 +87,7 @@ struct asyncppp {
static int flag_time = HZ;
module_param(flag_time, int, 0);
MODULE_PARM_DESC(flag_time, "ppp_async: interval between flagged packets (in clock ticks)");
+MODULE_DESCRIPTION("PPP async serial channel module");
MODULE_LICENSE("GPL");
MODULE_ALIAS_LDISC(N_PPP);
@@ -102,10 +99,10 @@ static int ppp_async_send(struct ppp_channel *chan, struct sk_buff *skb);
static int ppp_async_push(struct asyncppp *ap);
static void ppp_async_flush_output(struct asyncppp *ap);
static void ppp_async_input(struct asyncppp *ap, const unsigned char *buf,
- char *flags, int count);
+ const u8 *flags, int count);
static int ppp_async_ioctl(struct ppp_channel *chan, unsigned int cmd,
unsigned long arg);
-static void ppp_async_process(unsigned long arg);
+static void ppp_async_process(struct tasklet_struct *t);
static void async_lcp_peek(struct asyncppp *ap, unsigned char *data,
int len, int inbound);
@@ -183,7 +180,7 @@ ppp_asynctty_open(struct tty_struct *tty)
ap->lcp_fcs = -1;
skb_queue_head_init(&ap->rqueue);
- tasklet_init(&ap->tsk, ppp_async_process, (unsigned long) ap);
+ tasklet_setup(&ap->tsk, ppp_async_process);
refcount_set(&ap->refcnt, 1);
init_completion(&ap->dead);
@@ -251,10 +248,9 @@ ppp_asynctty_close(struct tty_struct *tty)
* Wait for I/O to driver to complete and unregister PPP channel.
* This is already done by the close routine, so just call that.
*/
-static int ppp_asynctty_hangup(struct tty_struct *tty)
+static void ppp_asynctty_hangup(struct tty_struct *tty)
{
ppp_asynctty_close(tty);
- return 0;
}
/*
@@ -262,8 +258,8 @@ static int ppp_asynctty_hangup(struct tty_struct *tty)
* Pppd reads and writes packets via /dev/ppp instead.
*/
static ssize_t
-ppp_asynctty_read(struct tty_struct *tty, struct file *file,
- unsigned char __user *buf, size_t count)
+ppp_asynctty_read(struct tty_struct *tty, struct file *file, u8 *buf,
+ size_t count, void **cookie, unsigned long offset)
{
return -EAGAIN;
}
@@ -273,8 +269,8 @@ ppp_asynctty_read(struct tty_struct *tty, struct file *file,
* from the ppp generic stuff.
*/
static ssize_t
-ppp_asynctty_write(struct tty_struct *tty, struct file *file,
- const unsigned char *buf, size_t count)
+ppp_asynctty_write(struct tty_struct *tty, struct file *file, const u8 *buf,
+ size_t count)
{
return -EAGAIN;
}
@@ -285,8 +281,7 @@ ppp_asynctty_write(struct tty_struct *tty, struct file *file,
*/
static int
-ppp_asynctty_ioctl(struct tty_struct *tty, struct file *file,
- unsigned int cmd, unsigned long arg)
+ppp_asynctty_ioctl(struct tty_struct *tty, unsigned int cmd, unsigned long arg)
{
struct asyncppp *ap = ap_get(tty);
int err, val;
@@ -314,7 +309,7 @@ ppp_asynctty_ioctl(struct tty_struct *tty, struct file *file,
/* flush our buffers and the serial port's buffer */
if (arg == TCIOFLUSH || arg == TCOFLUSH)
ppp_async_flush_output(ap);
- err = n_tty_ioctl_helper(tty, file, cmd, arg);
+ err = n_tty_ioctl_helper(tty, cmd, arg);
break;
case FIONREAD:
@@ -326,24 +321,17 @@ ppp_asynctty_ioctl(struct tty_struct *tty, struct file *file,
default:
/* Try the various mode ioctls */
- err = tty_mode_ioctl(tty, file, cmd, arg);
+ err = tty_mode_ioctl(tty, cmd, arg);
}
ap_put(ap);
return err;
}
-/* No kernel lock - fine */
-static __poll_t
-ppp_asynctty_poll(struct tty_struct *tty, struct file *file, poll_table *wait)
-{
- return 0;
-}
-
/* May sleep, don't call from interrupt level or with interrupts disabled */
static void
-ppp_asynctty_receive(struct tty_struct *tty, const unsigned char *buf,
- char *cflags, int count)
+ppp_asynctty_receive(struct tty_struct *tty, const u8 *buf, const u8 *cflags,
+ size_t count)
{
struct asyncppp *ap = ap_get(tty);
unsigned long flags;
@@ -375,7 +363,7 @@ ppp_asynctty_wakeup(struct tty_struct *tty)
static struct tty_ldisc_ops ppp_ldisc = {
.owner = THIS_MODULE,
- .magic = TTY_LDISC_MAGIC,
+ .num = N_PPP,
.name = "ppp",
.open = ppp_asynctty_open,
.close = ppp_asynctty_close,
@@ -383,7 +371,6 @@ static struct tty_ldisc_ops ppp_ldisc = {
.read = ppp_asynctty_read,
.write = ppp_asynctty_write,
.ioctl = ppp_asynctty_ioctl,
- .poll = ppp_asynctty_poll,
.receive_buf = ppp_asynctty_receive,
.write_wakeup = ppp_asynctty_wakeup,
};
@@ -393,7 +380,7 @@ ppp_async_init(void)
{
int err;
- err = tty_register_ldisc(N_PPP, &ppp_ldisc);
+ err = tty_register_ldisc(&ppp_ldisc);
if (err != 0)
printk(KERN_ERR "PPP_async: error %d registering line disc.\n",
err);
@@ -474,6 +461,10 @@ ppp_async_ioctl(struct ppp_channel *chan, unsigned int cmd, unsigned long arg)
case PPPIOCSMRU:
if (get_user(val, p))
break;
+ if (val > U16_MAX) {
+ err = -EINVAL;
+ break;
+ }
if (val < PPP_MRU)
val = PPP_MRU;
ap->mru = val;
@@ -492,9 +483,9 @@ ppp_async_ioctl(struct ppp_channel *chan, unsigned int cmd, unsigned long arg)
* to the ppp_generic code, and to tell the ppp_generic code
* if we can accept more output now.
*/
-static void ppp_async_process(unsigned long arg)
+static void ppp_async_process(struct tasklet_struct *t)
{
- struct asyncppp *ap = (struct asyncppp *) arg;
+ struct asyncppp *ap = from_tasklet(ap, t, tsk);
struct sk_buff *skb;
/* process received packets */
@@ -547,11 +538,11 @@ ppp_async_encode(struct asyncppp *ap)
proto = get_unaligned_be16(data);
/*
- * LCP packets with code values between 1 (configure-reqest)
+ * LCP packets with code values between 1 (configure-request)
* and 7 (code-reject) must be sent as though no options
* had been negotiated.
*/
- islcp = proto == PPP_LCP && 1 <= data[2] && data[2] <= 7;
+ islcp = proto == PPP_LCP && count >= 3 && 1 <= data[2] && data[2] <= 7;
if (i == 0) {
if (islcp)
@@ -832,8 +823,7 @@ process_input_packet(struct asyncppp *ap)
other ldisc functions but will not be re-entered */
static void
-ppp_async_input(struct asyncppp *ap, const unsigned char *buf,
- char *flags, int count)
+ppp_async_input(struct asyncppp *ap, const u8 *buf, const u8 *flags, int count)
{
struct sk_buff *skb;
int c, i, j, n, s, f;
@@ -878,15 +868,15 @@ ppp_async_input(struct asyncppp *ap, const unsigned char *buf,
skb = dev_alloc_skb(ap->mru + PPP_HDRLEN + 2);
if (!skb)
goto nomem;
- ap->rpkt = skb;
- }
- if (skb->len == 0) {
- /* Try to get the payload 4-byte aligned.
- * This should match the
- * PPP_ALLSTATIONS/PPP_UI/compressed tests in
- * process_input_packet, but we do not have
- * enough chars here to test buf[1] and buf[2].
- */
+ ap->rpkt = skb;
+ }
+ if (skb->len == 0) {
+ /* Try to get the payload 4-byte aligned.
+ * This should match the
+ * PPP_ALLSTATIONS/PPP_UI/compressed tests in
+ * process_input_packet, but we do not have
+ * enough chars here to test buf[1] and buf[2].
+ */
if (buf[0] != PPP_ALLSTATIONS)
skb_reserve(skb, 2 + (buf[0] & 1));
}
@@ -1019,8 +1009,7 @@ static void async_lcp_peek(struct asyncppp *ap, unsigned char *data,
static void __exit ppp_async_cleanup(void)
{
- if (tty_unregister_ldisc(N_PPP) != 0)
- printk(KERN_ERR "failed to unregister PPP line discipline\n");
+ tty_unregister_ldisc(&ppp_ldisc);
}
module_init(ppp_async_init);
generated by cgit (git 2.34.1) at 2025-12-24 22:22:46 +0000