[mirror_ubuntu-jammy-kernel.git] / net / ax25 / ax25_route.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *
 * Copyright (C) Alan Cox GW4PTS (alan@lxorguk.ukuu.org.uk)
 * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
 * Copyright (C) Steven Whitehouse GW7RRM (stevew@acm.org)
 * Copyright (C) Joerg Reuter DL1BKE (jreuter@yaina.de)
 * Copyright (C) Hans-Joachim Hetscher DD8NE (dd8ne@bnv-bamberg.de)
 * Copyright (C) Frederic Rible F1OAT (frible@teaser.fr)
 */

#include <linux/capability.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/socket.h>
#include <linux/timer.h>
#include <linux/in.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/string.h>
#include <linux/sockios.h>
#include <linux/net.h>
#include <linux/slab.h>
#include <net/ax25.h>
#include <linux/inet.h>
#include <linux/netdevice.h>
#include <linux/if_arp.h>
#include <linux/skbuff.h>
#include <linux/spinlock.h>
#include <net/sock.h>
#include <linux/uaccess.h>
#include <linux/fcntl.h>
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/seq_file.h>
#include <linux/export.h>

static ax25_route *ax25_route_list;
DEFINE_RWLOCK(ax25_route_lock);

void ax25_rt_device_down(struct net_device *dev)
{
	ax25_route *s, *t, *ax25_rt;

	write_lock_bh(&ax25_route_lock);
	ax25_rt = ax25_route_list;
	while (ax25_rt != NULL) {
		s       = ax25_rt;
		ax25_rt = ax25_rt->next;

		if (s->dev == dev) {
			if (ax25_route_list == s) {
				ax25_route_list = s->next;
				kfree(s->digipeat);
				kfree(s);
			} else {
				for (t = ax25_route_list; t != NULL; t = t->next) {
					if (t->next == s) {
						t->next = s->next;
						kfree(s->digipeat);
						kfree(s);
						break;
					}
				}
			}
		}
	}
	write_unlock_bh(&ax25_route_lock);
}

static int __must_check ax25_rt_add(struct ax25_routes_struct *route)
{
	ax25_route *ax25_rt;
	ax25_dev *ax25_dev;
	int i;

	if ((ax25_dev = ax25_addr_ax25dev(&route->port_addr)) == NULL)
		return -EINVAL;
	if (route->digi_count > AX25_MAX_DIGIS)
		return -EINVAL;

	write_lock_bh(&ax25_route_lock);

	ax25_rt = ax25_route_list;
	while (ax25_rt != NULL) {
		if (ax25cmp(&ax25_rt->callsign, &route->dest_addr) == 0 &&
			    ax25_rt->dev == ax25_dev->dev) {
			kfree(ax25_rt->digipeat);
			ax25_rt->digipeat = NULL;
			if (route->digi_count != 0) {
				if ((ax25_rt->digipeat = kmalloc(sizeof(ax25_digi), GFP_ATOMIC)) == NULL) {
					write_unlock_bh(&ax25_route_lock);
					return -ENOMEM;
				}
				ax25_rt->digipeat->lastrepeat = -1;
				ax25_rt->digipeat->ndigi      = route->digi_count;
				for (i = 0; i < route->digi_count; i++) {
					ax25_rt->digipeat->repeated[i] = 0;
					ax25_rt->digipeat->calls[i]    = route->digi_addr[i];
				}
			}
			write_unlock_bh(&ax25_route_lock);
			return 0;
		}
		ax25_rt = ax25_rt->next;
	}

	if ((ax25_rt = kmalloc(sizeof(ax25_route), GFP_ATOMIC)) == NULL) {
		write_unlock_bh(&ax25_route_lock);
		return -ENOMEM;
	}

	refcount_set(&ax25_rt->refcount, 1);
	ax25_rt->callsign     = route->dest_addr;
	ax25_rt->dev          = ax25_dev->dev;
	ax25_rt->digipeat     = NULL;
	ax25_rt->ip_mode      = ' ';
	ax25_dev_put(ax25_dev);
	if (route->digi_count != 0) {
		if ((ax25_rt->digipeat = kmalloc(sizeof(ax25_digi), GFP_ATOMIC)) == NULL) {
			write_unlock_bh(&ax25_route_lock);
			kfree(ax25_rt);
			return -ENOMEM;
		}
		ax25_rt->digipeat->lastrepeat = -1;
		ax25_rt->digipeat->ndigi      = route->digi_count;
		for (i = 0; i < route->digi_count; i++) {
			ax25_rt->digipeat->repeated[i] = 0;
			ax25_rt->digipeat->calls[i]    = route->digi_addr[i];
		}
	}
	ax25_rt->next   = ax25_route_list;
	ax25_route_list = ax25_rt;
	write_unlock_bh(&ax25_route_lock);

	return 0;
}

void __ax25_put_route(ax25_route *ax25_rt)
{
	kfree(ax25_rt->digipeat);
	kfree(ax25_rt);
}

static int ax25_rt_del(struct ax25_routes_struct *route)
{
	ax25_route *s, *t, *ax25_rt;
	ax25_dev *ax25_dev;

	if ((ax25_dev = ax25_addr_ax25dev(&route->port_addr)) == NULL)
		return -EINVAL;

	write_lock_bh(&ax25_route_lock);

	ax25_rt = ax25_route_list;
	while (ax25_rt != NULL) {
		s       = ax25_rt;
		ax25_rt = ax25_rt->next;
		if (s->dev == ax25_dev->dev &&
		    ax25cmp(&route->dest_addr, &s->callsign) == 0) {
			if (ax25_route_list == s) {
				ax25_route_list = s->next;
				ax25_put_route(s);
			} else {
				for (t = ax25_route_list; t != NULL; t = t->next) {
					if (t->next == s) {
						t->next = s->next;
						ax25_put_route(s);
						break;
					}
				}
			}
		}
	}
	ax25_dev_put(ax25_dev);
	write_unlock_bh(&ax25_route_lock);

	return 0;
}

static int ax25_rt_opt(struct ax25_route_opt_struct *rt_option)
{
	ax25_route *ax25_rt;
	ax25_dev *ax25_dev;
	int err = 0;

	if ((ax25_dev = ax25_addr_ax25dev(&rt_option->port_addr)) == NULL)
		return -EINVAL;

	write_lock_bh(&ax25_route_lock);

	ax25_rt = ax25_route_list;
	while (ax25_rt != NULL) {
		if (ax25_rt->dev == ax25_dev->dev &&
		    ax25cmp(&rt_option->dest_addr, &ax25_rt->callsign) == 0) {
			switch (rt_option->cmd) {
			case AX25_SET_RT_IPMODE:
				switch (rt_option->arg) {
				case ' ':
				case 'D':
				case 'V':
					ax25_rt->ip_mode = rt_option->arg;
					break;
				default:
					err = -EINVAL;
					goto out;
				}
				break;
			default:
				err = -EINVAL;
				goto out;
			}
		}
		ax25_rt = ax25_rt->next;
	}

out:
	ax25_dev_put(ax25_dev);
	write_unlock_bh(&ax25_route_lock);
	return err;
}

int ax25_rt_ioctl(unsigned int cmd, void __user *arg)
{
	struct ax25_route_opt_struct rt_option;
	struct ax25_routes_struct route;

	switch (cmd) {
	case SIOCADDRT:
		if (copy_from_user(&route, arg, sizeof(route)))
			return -EFAULT;
		return ax25_rt_add(&route);

	case SIOCDELRT:
		if (copy_from_user(&route, arg, sizeof(route)))
			return -EFAULT;
		return ax25_rt_del(&route);

	case SIOCAX25OPTRT:
		if (copy_from_user(&rt_option, arg, sizeof(rt_option)))
			return -EFAULT;
		return ax25_rt_opt(&rt_option);

	default:
		return -EINVAL;
	}
}

#ifdef CONFIG_PROC_FS

static void *ax25_rt_seq_start(struct seq_file *seq, loff_t *pos)
	__acquires(ax25_route_lock)
{
	struct ax25_route *ax25_rt;
	int i = 1;

	read_lock(&ax25_route_lock);
	if (*pos == 0)
		return SEQ_START_TOKEN;

	for (ax25_rt = ax25_route_list; ax25_rt != NULL; ax25_rt = ax25_rt->next) {
		if (i == *pos)
			return ax25_rt;
		++i;
	}

	return NULL;
}

static void *ax25_rt_seq_next(struct seq_file *seq, void *v, loff_t *pos)
{
	++*pos;
	return (v == SEQ_START_TOKEN) ? ax25_route_list :
		((struct ax25_route *) v)->next;
}

static void ax25_rt_seq_stop(struct seq_file *seq, void *v)
	__releases(ax25_route_lock)
{
	read_unlock(&ax25_route_lock);
}

static int ax25_rt_seq_show(struct seq_file *seq, void *v)
{
	char buf[11];

	if (v == SEQ_START_TOKEN)
		seq_puts(seq, "callsign  dev  mode digipeaters\n");
	else {
		struct ax25_route *ax25_rt = v;
		const char *callsign;
		int i;

		if (ax25cmp(&ax25_rt->callsign, &null_ax25_address) == 0)
			callsign = "default";
		else
			callsign = ax2asc(buf, &ax25_rt->callsign);

		seq_printf(seq, "%-9s %-4s",
			callsign,
			ax25_rt->dev ? ax25_rt->dev->name : "???");

		switch (ax25_rt->ip_mode) {
		case 'V':
			seq_puts(seq, "   vc");
			break;
		case 'D':
			seq_puts(seq, "   dg");
			break;
		default:
			seq_puts(seq, "    *");
			break;
		}

		if (ax25_rt->digipeat != NULL)
			for (i = 0; i < ax25_rt->digipeat->ndigi; i++)
				seq_printf(seq, " %s",
				     ax2asc(buf, &ax25_rt->digipeat->calls[i]));

		seq_puts(seq, "\n");
	}
	return 0;
}

const struct seq_operations ax25_rt_seqops = {
	.start = ax25_rt_seq_start,
	.next = ax25_rt_seq_next,
	.stop = ax25_rt_seq_stop,
	.show = ax25_rt_seq_show,
};
#endif

/*
 *	Find AX.25 route
 *
 *	Only routes with a reference count of zero can be destroyed.
 *	Must be called with ax25_route_lock read locked.
 */
ax25_route *ax25_get_route(ax25_address *addr, struct net_device *dev)
{
	ax25_route *ax25_spe_rt = NULL;
	ax25_route *ax25_def_rt = NULL;
	ax25_route *ax25_rt;

	/*
	 *	Bind to the physical interface we heard them on, or the default
	 *	route if none is found;
	 */
	for (ax25_rt = ax25_route_list; ax25_rt != NULL; ax25_rt = ax25_rt->next) {
		if (dev == NULL) {
			if (ax25cmp(&ax25_rt->callsign, addr) == 0 && ax25_rt->dev != NULL)
				ax25_spe_rt = ax25_rt;
			if (ax25cmp(&ax25_rt->callsign, &null_ax25_address) == 0 && ax25_rt->dev != NULL)
				ax25_def_rt = ax25_rt;
		} else {
			if (ax25cmp(&ax25_rt->callsign, addr) == 0 && ax25_rt->dev == dev)
				ax25_spe_rt = ax25_rt;
			if (ax25cmp(&ax25_rt->callsign, &null_ax25_address) == 0 && ax25_rt->dev == dev)
				ax25_def_rt = ax25_rt;
		}
	}

	ax25_rt = ax25_def_rt;
	if (ax25_spe_rt != NULL)
		ax25_rt = ax25_spe_rt;

	return ax25_rt;
}

/*
 *	Adjust path: If you specify a default route and want to connect
 *      a target on the digipeater path but w/o having a special route
 *	set before, the path has to be truncated from your target on.
 */
static inline void ax25_adjust_path(ax25_address *addr, ax25_digi *digipeat)
{
	int k;

	for (k = 0; k < digipeat->ndigi; k++) {
		if (ax25cmp(addr, &digipeat->calls[k]) == 0)
			break;
	}

	digipeat->ndigi = k;
}


/*
 *	Find which interface to use.
 */
int ax25_rt_autobind(ax25_cb *ax25, ax25_address *addr)
{
	ax25_uid_assoc *user;
	ax25_route *ax25_rt;
	int err = 0;

	ax25_route_lock_use();
	ax25_rt = ax25_get_route(addr, NULL);
	if (!ax25_rt) {
		ax25_route_lock_unuse();
		return -EHOSTUNREACH;
	}
	if ((ax25->ax25_dev = ax25_dev_ax25dev(ax25_rt->dev)) == NULL) {
		err = -EHOSTUNREACH;
		goto put;
	}

	user = ax25_findbyuid(current_euid());
	if (user) {
		ax25->source_addr = user->call;
		ax25_uid_put(user);
	} else {
		if (ax25_uid_policy && !capable(CAP_NET_BIND_SERVICE)) {
			err = -EPERM;
			goto put;
		}
		ax25->source_addr = *(ax25_address *)ax25->ax25_dev->dev->dev_addr;
	}

	if (ax25_rt->digipeat != NULL) {
		ax25->digipeat = kmemdup(ax25_rt->digipeat, sizeof(ax25_digi),
					 GFP_ATOMIC);
		if (ax25->digipeat == NULL) {
			err = -ENOMEM;
			goto put;
		}
		ax25_adjust_path(addr, ax25->digipeat);
	}

	if (ax25->sk != NULL) {
		local_bh_disable();
		bh_lock_sock(ax25->sk);
		sock_reset_flag(ax25->sk, SOCK_ZAPPED);
		bh_unlock_sock(ax25->sk);
		local_bh_enable();
	}

put:
	ax25_route_lock_unuse();
	return err;
}

struct sk_buff *ax25_rt_build_path(struct sk_buff *skb, ax25_address *src,
	ax25_address *dest, ax25_digi *digi)
{
	unsigned char *bp;
	int len;

	len = digi->ndigi * AX25_ADDR_LEN;

	if (unlikely(skb_headroom(skb) < len)) {
		skb = skb_expand_head(skb, len);
		if (!skb) {
			printk(KERN_CRIT "AX.25: ax25_dg_build_path - out of memory\n");
			return NULL;
		}
	}

	bp = skb_push(skb, len);

	ax25_addr_build(bp, src, dest, digi, AX25_COMMAND, AX25_MODULUS);

	return skb;
}

/*
 *	Free all memory associated with routing structures.
 */
void __exit ax25_rt_free(void)
{
	ax25_route *s, *ax25_rt = ax25_route_list;

	write_lock_bh(&ax25_route_lock);
	while (ax25_rt != NULL) {
		s       = ax25_rt;
		ax25_rt = ax25_rt->next;

		kfree(s->digipeat);
		kfree(s);
	}
	write_unlock_bh(&ax25_route_lock);
}
Commit	Line	Data
2874c5fd	1	// SPDX-License-Identifier: GPL-2.0-or-later
1da177e4	2	/*
1da177e4 LT	3	*
	4	* Copyright (C) Alan Cox GW4PTS (alan@lxorguk.ukuu.org.uk)
	5	* Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
	6	* Copyright (C) Steven Whitehouse GW7RRM (stevew@acm.org)
	7	* Copyright (C) Joerg Reuter DL1BKE (jreuter@yaina.de)
	8	* Copyright (C) Hans-Joachim Hetscher DD8NE (dd8ne@bnv-bamberg.de)
	9	* Copyright (C) Frederic Rible F1OAT (frible@teaser.fr)
	10	*/
4fc268d2 RD	11
4fc268d2 RD	12	#include <linux/capability.h>
1da177e4 LT	13	#include <linux/errno.h>
	14	#include <linux/types.h>
	15	#include <linux/socket.h>
	16	#include <linux/timer.h>
	17	#include <linux/in.h>
	18	#include <linux/kernel.h>
	19	#include <linux/sched.h>
	20	#include <linux/string.h>
	21	#include <linux/sockios.h>
	22	#include <linux/net.h>
5a0e3ad6	23	#include <linux/slab.h>
1da177e4 LT	24	#include <net/ax25.h>
	25	#include <linux/inet.h>
	26	#include <linux/netdevice.h>
	27	#include <linux/if_arp.h>
	28	#include <linux/skbuff.h>
	29	#include <linux/spinlock.h>
	30	#include <net/sock.h>
7c0f6ba6	31	#include <linux/uaccess.h>
1da177e4 LT	32	#include <linux/fcntl.h>
	33	#include <linux/mm.h>
	34	#include <linux/interrupt.h>
	35	#include <linux/init.h>
	36	#include <linux/seq_file.h>
bc3b2d7f	37	#include <linux/export.h>
1da177e4 LT	38
1da177e4 LT	39	static ax25_route *ax25_route_list;
63530aba	40	DEFINE_RWLOCK(ax25_route_lock);
1da177e4	41
1da177e4 LT	42	void ax25_rt_device_down(struct net_device *dev)
	43	{
	44	ax25_route s, t, *ax25_rt;
	45
4de211f1	46	write_lock_bh(&ax25_route_lock);
1da177e4 LT	47	ax25_rt = ax25_route_list;
	48	while (ax25_rt != NULL) {
	49	s = ax25_rt;
	50	ax25_rt = ax25_rt->next;
	51
	52	if (s->dev == dev) {
	53	if (ax25_route_list == s) {
	54	ax25_route_list = s->next;
a51482bd	55	kfree(s->digipeat);
1da177e4 LT	56	kfree(s);
	57	} else {
	58	for (t = ax25_route_list; t != NULL; t = t->next) {
	59	if (t->next == s) {
	60	t->next = s->next;
a51482bd	61	kfree(s->digipeat);
1da177e4 LT	62	kfree(s);
	63	break;
	64	}
	65	}
	66	}
	67	}
	68	}
4de211f1	69	write_unlock_bh(&ax25_route_lock);
1da177e4 LT	70	}
1da177e4 LT	71
c9266b99	72	static int __must_check ax25_rt_add(struct ax25_routes_struct *route)
1da177e4 LT	73	{
	74	ax25_route *ax25_rt;
	75	ax25_dev *ax25_dev;
	76	int i;
	77
	78	if ((ax25_dev = ax25_addr_ax25dev(&route->port_addr)) == NULL)
	79	return -EINVAL;
	80	if (route->digi_count > AX25_MAX_DIGIS)
	81	return -EINVAL;
	82
4de211f1	83	write_lock_bh(&ax25_route_lock);
1da177e4 LT	84
	85	ax25_rt = ax25_route_list;
	86	while (ax25_rt != NULL) {
	87	if (ax25cmp(&ax25_rt->callsign, &route->dest_addr) == 0 &&
528930b9	88	ax25_rt->dev == ax25_dev->dev) {
a51482bd JJ	89	kfree(ax25_rt->digipeat);
a51482bd JJ	90	ax25_rt->digipeat = NULL;
1da177e4 LT	91	if (route->digi_count != 0) {
1da177e4 LT	92	if ((ax25_rt->digipeat = kmalloc(sizeof(ax25_digi), GFP_ATOMIC)) == NULL) {
4de211f1	93	write_unlock_bh(&ax25_route_lock);
1da177e4 LT	94	return -ENOMEM;
	95	}
	96	ax25_rt->digipeat->lastrepeat = -1;
	97	ax25_rt->digipeat->ndigi = route->digi_count;
	98	for (i = 0; i < route->digi_count; i++) {
	99	ax25_rt->digipeat->repeated[i] = 0;
	100	ax25_rt->digipeat->calls[i] = route->digi_addr[i];
	101	}
	102	}
4de211f1	103	write_unlock_bh(&ax25_route_lock);
1da177e4 LT	104	return 0;
	105	}
	106	ax25_rt = ax25_rt->next;
	107	}
	108
	109	if ((ax25_rt = kmalloc(sizeof(ax25_route), GFP_ATOMIC)) == NULL) {
4de211f1	110	write_unlock_bh(&ax25_route_lock);
1da177e4 LT	111	return -ENOMEM;
	112	}
	113
39f25d42	114	refcount_set(&ax25_rt->refcount, 1);
1da177e4 LT	115	ax25_rt->callsign = route->dest_addr;
	116	ax25_rt->dev = ax25_dev->dev;
	117	ax25_rt->digipeat = NULL;
	118	ax25_rt->ip_mode = ' ';
6f59a348	119	ax25_dev_put(ax25_dev);
1da177e4 LT	120	if (route->digi_count != 0) {
1da177e4 LT	121	if ((ax25_rt->digipeat = kmalloc(sizeof(ax25_digi), GFP_ATOMIC)) == NULL) {
4de211f1	122	write_unlock_bh(&ax25_route_lock);
1da177e4 LT	123	kfree(ax25_rt);
	124	return -ENOMEM;
	125	}
	126	ax25_rt->digipeat->lastrepeat = -1;
	127	ax25_rt->digipeat->ndigi = route->digi_count;
	128	for (i = 0; i < route->digi_count; i++) {
	129	ax25_rt->digipeat->repeated[i] = 0;
	130	ax25_rt->digipeat->calls[i] = route->digi_addr[i];
	131	}
	132	}
	133	ax25_rt->next = ax25_route_list;
	134	ax25_route_list = ax25_rt;
4de211f1	135	write_unlock_bh(&ax25_route_lock);
1da177e4 LT	136
	137	return 0;
	138	}
	139
006f68b8	140	void __ax25_put_route(ax25_route *ax25_rt)
1da177e4	141	{
006f68b8 RB	142	kfree(ax25_rt->digipeat);
006f68b8 RB	143	kfree(ax25_rt);
1da177e4 LT	144	}
	145
	146	static int ax25_rt_del(struct ax25_routes_struct *route)
	147	{
	148	ax25_route s, t, *ax25_rt;
	149	ax25_dev *ax25_dev;
	150
	151	if ((ax25_dev = ax25_addr_ax25dev(&route->port_addr)) == NULL)
	152	return -EINVAL;
	153
4de211f1	154	write_lock_bh(&ax25_route_lock);
1da177e4 LT	155
	156	ax25_rt = ax25_route_list;
	157	while (ax25_rt != NULL) {
	158	s = ax25_rt;
	159	ax25_rt = ax25_rt->next;
	160	if (s->dev == ax25_dev->dev &&
	161	ax25cmp(&route->dest_addr, &s->callsign) == 0) {
	162	if (ax25_route_list == s) {
	163	ax25_route_list = s->next;
006f68b8	164	ax25_put_route(s);
1da177e4 LT	165	} else {
	166	for (t = ax25_route_list; t != NULL; t = t->next) {
	167	if (t->next == s) {
	168	t->next = s->next;
006f68b8	169	ax25_put_route(s);
1da177e4 LT	170	break;
	171	}
	172	}
	173	}
	174	}
	175	}
6f59a348	176	ax25_dev_put(ax25_dev);
4de211f1	177	write_unlock_bh(&ax25_route_lock);
1da177e4 LT	178
	179	return 0;
	180	}
	181
	182	static int ax25_rt_opt(struct ax25_route_opt_struct *rt_option)
	183	{
	184	ax25_route *ax25_rt;
	185	ax25_dev *ax25_dev;
	186	int err = 0;
	187
	188	if ((ax25_dev = ax25_addr_ax25dev(&rt_option->port_addr)) == NULL)
	189	return -EINVAL;
	190
4de211f1	191	write_lock_bh(&ax25_route_lock);
1da177e4 LT	192
	193	ax25_rt = ax25_route_list;
	194	while (ax25_rt != NULL) {
	195	if (ax25_rt->dev == ax25_dev->dev &&
	196	ax25cmp(&rt_option->dest_addr, &ax25_rt->callsign) == 0) {
	197	switch (rt_option->cmd) {
	198	case AX25_SET_RT_IPMODE:
	199	switch (rt_option->arg) {
	200	case ' ':
	201	case 'D':
	202	case 'V':
	203	ax25_rt->ip_mode = rt_option->arg;
	204	break;
	205	default:
	206	err = -EINVAL;
	207	goto out;
	208	}
	209	break;
	210	default:
	211	err = -EINVAL;
	212	goto out;
	213	}
	214	}
	215	ax25_rt = ax25_rt->next;
	216	}
	217
	218	out:
6f59a348	219	ax25_dev_put(ax25_dev);
4de211f1	220	write_unlock_bh(&ax25_route_lock);
1da177e4 LT	221	return err;
	222	}
	223
	224	int ax25_rt_ioctl(unsigned int cmd, void __user *arg)
	225	{
	226	struct ax25_route_opt_struct rt_option;
	227	struct ax25_routes_struct route;
	228
	229	switch (cmd) {
	230	case SIOCADDRT:
	231	if (copy_from_user(&route, arg, sizeof(route)))
	232	return -EFAULT;
	233	return ax25_rt_add(&route);
	234
	235	case SIOCDELRT:
	236	if (copy_from_user(&route, arg, sizeof(route)))
	237	return -EFAULT;
	238	return ax25_rt_del(&route);
	239
	240	case SIOCAX25OPTRT:
	241	if (copy_from_user(&rt_option, arg, sizeof(rt_option)))
	242	return -EFAULT;
	243	return ax25_rt_opt(&rt_option);
	244
	245	default:
	246	return -EINVAL;
	247	}
	248	}
	249
	250	#ifdef CONFIG_PROC_FS
	251
	252	static void ax25_rt_seq_start(struct seq_file seq, loff_t *pos)
f16f3026	253	__acquires(ax25_route_lock)
1da177e4 LT	254	{
	255	struct ax25_route *ax25_rt;
	256	int i = 1;
528930b9 YH	257
528930b9 YH	258	read_lock(&ax25_route_lock);
1da177e4 LT	259	if (*pos == 0)
	260	return SEQ_START_TOKEN;
	261
	262	for (ax25_rt = ax25_route_list; ax25_rt != NULL; ax25_rt = ax25_rt->next) {
	263	if (i == *pos)
	264	return ax25_rt;
	265	++i;
	266	}
	267
	268	return NULL;
	269	}
	270
	271	static void ax25_rt_seq_next(struct seq_file seq, void v, loff_t pos)
	272	{
	273	++*pos;
528930b9	274	return (v == SEQ_START_TOKEN) ? ax25_route_list :
1da177e4 LT	275	((struct ax25_route *) v)->next;
	276	}
	277
	278	static void ax25_rt_seq_stop(struct seq_file seq, void v)
f16f3026	279	__releases(ax25_route_lock)
1da177e4 LT	280	{
	281	read_unlock(&ax25_route_lock);
	282	}
	283
	284	static int ax25_rt_seq_show(struct seq_file seq, void v)
	285	{
f75268cd RB	286	char buf[11];
f75268cd RB	287
1da177e4 LT	288	if (v == SEQ_START_TOKEN)
	289	seq_puts(seq, "callsign dev mode digipeaters\n");
	290	else {
	291	struct ax25_route *ax25_rt = v;
	292	const char *callsign;
	293	int i;
	294
	295	if (ax25cmp(&ax25_rt->callsign, &null_ax25_address) == 0)
	296	callsign = "default";
	297	else
f75268cd	298	callsign = ax2asc(buf, &ax25_rt->callsign);
1da177e4 LT	299
	300	seq_printf(seq, "%-9s %-4s",
	301	callsign,
	302	ax25_rt->dev ? ax25_rt->dev->name : "???");
	303
	304	switch (ax25_rt->ip_mode) {
	305	case 'V':
	306	seq_puts(seq, " vc");
	307	break;
	308	case 'D':
	309	seq_puts(seq, " dg");
	310	break;
	311	default:
	312	seq_puts(seq, " *");
	313	break;
	314	}
	315
	316	if (ax25_rt->digipeat != NULL)
	317	for (i = 0; i < ax25_rt->digipeat->ndigi; i++)
f75268cd RB	318	seq_printf(seq, " %s",
f75268cd RB	319	ax2asc(buf, &ax25_rt->digipeat->calls[i]));
1da177e4 LT	320
	321	seq_puts(seq, "\n");
	322	}
	323	return 0;
	324	}
	325
fddda2b7	326	const struct seq_operations ax25_rt_seqops = {
1da177e4 LT	327	.start = ax25_rt_seq_start,
	328	.next = ax25_rt_seq_next,
	329	.stop = ax25_rt_seq_stop,
	330	.show = ax25_rt_seq_show,
	331	};
1da177e4 LT	332	#endif
	333
	334	/*
	335	* Find AX.25 route
	336	*
3f072310	337	* Only routes with a reference count of zero can be destroyed.
63530aba	338	* Must be called with ax25_route_lock read locked.
1da177e4	339	*/
006f68b8	340	ax25_route ax25_get_route(ax25_address addr, struct net_device *dev)
1da177e4 LT	341	{
	342	ax25_route *ax25_spe_rt = NULL;
	343	ax25_route *ax25_def_rt = NULL;
	344	ax25_route *ax25_rt;
	345
1da177e4 LT	346	/*
	347	* Bind to the physical interface we heard them on, or the default
	348	* route if none is found;
	349	*/
	350	for (ax25_rt = ax25_route_list; ax25_rt != NULL; ax25_rt = ax25_rt->next) {
	351	if (dev == NULL) {
	352	if (ax25cmp(&ax25_rt->callsign, addr) == 0 && ax25_rt->dev != NULL)
	353	ax25_spe_rt = ax25_rt;
	354	if (ax25cmp(&ax25_rt->callsign, &null_ax25_address) == 0 && ax25_rt->dev != NULL)
	355	ax25_def_rt = ax25_rt;
	356	} else {
	357	if (ax25cmp(&ax25_rt->callsign, addr) == 0 && ax25_rt->dev == dev)
	358	ax25_spe_rt = ax25_rt;
	359	if (ax25cmp(&ax25_rt->callsign, &null_ax25_address) == 0 && ax25_rt->dev == dev)
	360	ax25_def_rt = ax25_rt;
	361	}
	362	}
	363
	364	ax25_rt = ax25_def_rt;
	365	if (ax25_spe_rt != NULL)
	366	ax25_rt = ax25_spe_rt;
	367
1da177e4 LT	368	return ax25_rt;
	369	}
	370
	371	/*
	372	* Adjust path: If you specify a default route and want to connect
	373	* a target on the digipeater path but w/o having a special route
	374	* set before, the path has to be truncated from your target on.
	375	*/
	376	static inline void ax25_adjust_path(ax25_address addr, ax25_digi digipeat)
	377	{
	378	int k;
	379
	380	for (k = 0; k < digipeat->ndigi; k++) {
	381	if (ax25cmp(addr, &digipeat->calls[k]) == 0)
	382	break;
	383	}
	384
	385	digipeat->ndigi = k;
	386	}
	387
	388
	389	/*
	390	* Find which interface to use.
	391	*/
	392	int ax25_rt_autobind(ax25_cb ax25, ax25_address addr)
	393	{
01d7dd0e	394	ax25_uid_assoc *user;
1da177e4	395	ax25_route *ax25_rt;
b3d18f15	396	int err = 0;
1da177e4	397
63530aba ED	398	ax25_route_lock_use();
	399	ax25_rt = ax25_get_route(addr, NULL);
	400	if (!ax25_rt) {
	401	ax25_route_lock_unuse();
1da177e4	402	return -EHOSTUNREACH;
63530aba	403	}
1da177e4 LT	404	if ((ax25->ax25_dev = ax25_dev_ax25dev(ax25_rt->dev)) == NULL) {
	405	err = -EHOSTUNREACH;
	406	goto put;
	407	}
	408
73400407	409	user = ax25_findbyuid(current_euid());
01d7dd0e RB	410	if (user) {
	411	ax25->source_addr = user->call;
	412	ax25_uid_put(user);
	413	} else {
1da177e4 LT	414	if (ax25_uid_policy && !capable(CAP_NET_BIND_SERVICE)) {
	415	err = -EPERM;
	416	goto put;
	417	}
01d7dd0e	418	ax25->source_addr = (ax25_address )ax25->ax25_dev->dev->dev_addr;
1da177e4 LT	419	}
1da177e4 LT	420
1da177e4	421	if (ax25_rt->digipeat != NULL) {
0459d70a ACM	422	ax25->digipeat = kmemdup(ax25_rt->digipeat, sizeof(ax25_digi),
	423	GFP_ATOMIC);
	424	if (ax25->digipeat == NULL) {
1da177e4 LT	425	err = -ENOMEM;
	426	goto put;
	427	}
1da177e4 LT	428	ax25_adjust_path(addr, ax25->digipeat);
	429	}
	430
	431	if (ax25->sk != NULL) {
d4d5d8e8	432	local_bh_disable();
1da177e4 LT	433	bh_lock_sock(ax25->sk);
	434	sock_reset_flag(ax25->sk, SOCK_ZAPPED);
	435	bh_unlock_sock(ax25->sk);
d4d5d8e8	436	local_bh_enable();
1da177e4 LT	437	}
	438
	439	put:
63530aba	440	ax25_route_lock_unuse();
b3d18f15	441	return err;
1da177e4 LT	442	}
1da177e4 LT	443
1da177e4 LT	444	struct sk_buff ax25_rt_build_path(struct sk_buff skb, ax25_address *src,
	445	ax25_address dest, ax25_digi digi)
	446	{
1da177e4 LT	447	unsigned char *bp;
	448	int len;
	449
	450	len = digi->ndigi * AX25_ADDR_LEN;
	451
53744a4a VA	452	if (unlikely(skb_headroom(skb) < len)) {
	453	skb = skb_expand_head(skb, len);
	454	if (!skb) {
1da177e4 LT	455	printk(KERN_CRIT "AX.25: ax25_dg_build_path - out of memory\n");
	456	return NULL;
	457	}
1da177e4 LT	458	}
	459
	460	bp = skb_push(skb, len);
	461
	462	ax25_addr_build(bp, src, dest, digi, AX25_COMMAND, AX25_MODULUS);
	463
	464	return skb;
	465	}
	466
	467	/*
	468	* Free all memory associated with routing structures.
	469	*/
	470	void __exit ax25_rt_free(void)
	471	{
	472	ax25_route s, ax25_rt = ax25_route_list;
	473
4de211f1	474	write_lock_bh(&ax25_route_lock);
1da177e4 LT	475	while (ax25_rt != NULL) {
	476	s = ax25_rt;
	477	ax25_rt = ax25_rt->next;
	478
a51482bd	479	kfree(s->digipeat);
1da177e4 LT	480	kfree(s);
1da177e4 LT	481	}
4de211f1	482	write_unlock_bh(&ax25_route_lock);
1da177e4	483	}