/*
 * proc_tty.c -- handles /proc/tty
 *
 * Copyright 1997, Theodore Ts'o
 */

#include <linux/uaccess.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/time.h>
#include <linux/proc_fs.h>
#include <linux/stat.h>
#include <linux/tty.h>
#include <linux/seq_file.h>
#include <linux/bitops.h>

/*
 * The /proc/tty directory inodes...
 */
static struct proc_dir_entry *proc_tty_driver;

/*
 * This is the handler for /proc/tty/drivers
 */
static void show_tty_range(struct seq_file *m, struct tty_driver *p,
	dev_t from, int num)
{
	seq_printf(m, "%-20s ", p->driver_name ? p->driver_name : "unknown");
	seq_printf(m, "/dev/%-8s ", p->name);
	if (p->num > 1) {
		seq_printf(m, "%3d %d-%d ", MAJOR(from), MINOR(from),
			MINOR(from) + num - 1);
	} else {
		seq_printf(m, "%3d %7d ", MAJOR(from), MINOR(from));
	}
	switch (p->type) {
	case TTY_DRIVER_TYPE_SYSTEM:
		seq_puts(m, "system");
		if (p->subtype == SYSTEM_TYPE_TTY)
			seq_puts(m, ":/dev/tty");
		else if (p->subtype == SYSTEM_TYPE_SYSCONS)
			seq_puts(m, ":console");
		else if (p->subtype == SYSTEM_TYPE_CONSOLE)
			seq_puts(m, ":vtmaster");
		break;
	case TTY_DRIVER_TYPE_CONSOLE:
		seq_puts(m, "console");
		break;
	case TTY_DRIVER_TYPE_SERIAL:
		seq_puts(m, "serial");
		break;
	case TTY_DRIVER_TYPE_PTY:
		if (p->subtype == PTY_TYPE_MASTER)
			seq_puts(m, "pty:master");
		else if (p->subtype == PTY_TYPE_SLAVE)
			seq_puts(m, "pty:slave");
		else
			seq_puts(m, "pty");
		break;
	default:
		seq_printf(m, "type:%d.%d", p->type, p->subtype);
	}
	seq_putc(m, '\n');
}

static int show_tty_driver(struct seq_file *m, void *v)
{
	struct tty_driver *p = list_entry(v, struct tty_driver, tty_drivers);
	dev_t from = MKDEV(p->major, p->minor_start);
	dev_t to = from + p->num;

	if (&p->tty_drivers == tty_drivers.next) {
		/* pseudo-drivers first */
		seq_printf(m, "%-20s /dev/%-8s ", "/dev/tty", "tty");
		seq_printf(m, "%3d %7d ", TTYAUX_MAJOR, 0);
		seq_puts(m, "system:/dev/tty\n");
		seq_printf(m, "%-20s /dev/%-8s ", "/dev/console", "console");
		seq_printf(m, "%3d %7d ", TTYAUX_MAJOR, 1);
		seq_puts(m, "system:console\n");
#ifdef CONFIG_UNIX98_PTYS
		seq_printf(m, "%-20s /dev/%-8s ", "/dev/ptmx", "ptmx");
		seq_printf(m, "%3d %7d ", TTYAUX_MAJOR, 2);
		seq_puts(m, "system\n");
#endif
#ifdef CONFIG_VT
		seq_printf(m, "%-20s /dev/%-8s ", "/dev/vc/0", "vc/0");
		seq_printf(m, "%3d %7d ", TTY_MAJOR, 0);
		seq_puts(m, "system:vtmaster\n");
#endif
	}

	while (MAJOR(from) < MAJOR(to)) {
		dev_t next = MKDEV(MAJOR(from)+1, 0);
		show_tty_range(m, p, from, next - from);
		from = next;
	}
	if (from != to)
		show_tty_range(m, p, from, to - from);
	return 0;
}

/* iterator */
static void *t_start(struct seq_file *m, loff_t *pos)
{
	mutex_lock(&tty_mutex);
	return seq_list_start(&tty_drivers, *pos);
}

static void *t_next(struct seq_file *m, void *v, loff_t *pos)
{
	return seq_list_next(v, &tty_drivers, pos);
}

static void t_stop(struct seq_file *m, void *v)
{
	mutex_unlock(&tty_mutex);
}

static const struct seq_operations tty_drivers_op = {
	.start	= t_start,
	.next	= t_next,
	.stop	= t_stop,
	.show	= show_tty_driver
};

static int tty_drivers_open(struct inode *inode, struct file *file)
{
	return seq_open(file, &tty_drivers_op);
}

static const struct file_operations proc_tty_drivers_operations = {
	.open		= tty_drivers_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= seq_release,
};

/*
 * This function is called by tty_register_driver() to handle
 * registering the driver's /proc handler into /proc/tty/driver/<foo>
 */
void proc_tty_register_driver(struct tty_driver *driver)
{
	struct proc_dir_entry *ent;
		
	if (!driver->driver_name || driver->proc_entry ||
	    !driver->ops->proc_fops)
		return;

	ent = proc_create_data(driver->driver_name, 0, proc_tty_driver,
			       driver->ops->proc_fops, driver);
	driver->proc_entry = ent;
}

/*
 * This function is called by tty_unregister_driver()
 */
void proc_tty_unregister_driver(struct tty_driver *driver)
{
	struct proc_dir_entry *ent;

	ent = driver->proc_entry;
	if (!ent)
		return;
		
	remove_proc_entry(driver->driver_name, proc_tty_driver);
	
	driver->proc_entry = NULL;
}

/*
 * Called by proc_root_init() to initialize the /proc/tty subtree
 */
void __init proc_tty_init(void)
{
	if (!proc_mkdir("tty", NULL))
		return;
	proc_mkdir("tty/ldisc", NULL);	/* Preserved: it's userspace visible */
	/*
	 * /proc/tty/driver/serial reveals the exact character counts for
	 * serial links which is just too easy to abuse for inferring
	 * password lengths and inter-keystroke timings during password
	 * entry.
	 */
	proc_tty_driver = proc_mkdir_mode("tty/driver", S_IRUSR|S_IXUSR, NULL);
	proc_create("tty/ldiscs", 0, NULL, &tty_ldiscs_proc_fops);
	proc_create("tty/drivers", 0, NULL, &proc_tty_drivers_operations);
}
efb4f263f1f4c2375731d3a9e2040030bc6a</a> (<a href='/cgit.cgi/linux/net-next.git/diff/?id=956a7ffe00b4e8b75d98881ae4d0bd1b580648cb&amp;id2=eb63efb4f263f1f4c2375731d3a9e2040030bc6a'>diff</a>)</td></tr><tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/?id=c4fdb6cff2aa0ae740c5f19b6f745cbbe786d42f'>c4fdb6cff2aa0ae740c5f19b6f745cbbe786d42f</a> (<a href='/cgit.cgi/linux/net-next.git/diff/?id=956a7ffe00b4e8b75d98881ae4d0bd1b580648cb&amp;id2=c4fdb6cff2aa0ae740c5f19b6f745cbbe786d42f'>diff</a>)</td></tr></table>
<div class='commit-subject'>Merge tag 'batman-adv-fix-for-davem' of git://git.open-mesh.org/linux-merge</div><div class='commit-msg'>Antonio Quartulli says:

====================
In this patchset you can find the following fixes:

1) check skb size to avoid reading beyond its border when delivering
   payloads, by Sven Eckelmann
2) initialize last_seen time in neigh_node object to prevent cleanup
   routine from accidentally purge it, by Marek Lindner
3) release "recently added" slave interfaces upon virtual/batman
   interface shutdown, by Sven Eckelmann
4) properly decrease router object reference counter upon routing table
   update, by Sven Eckelmann
5) release queue slots when purging OGM packets of deactivating slave
   interface, by Linus Lüssing

Patch 2 and 3 have no "Fixes:" tag because the offending commits date
back to when batman-adv was not yet officially in the net tree.
====================

Signed-off-by: David S. Miller &lt;davem@davemloft.net&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=956a7ffe00b4e8b75d98881ae4d0bd1b580648cb'>Diffstat</a></div><table summary='diffstat' class='diffstat'>