[linux.git] / net / ax25 / ax25_route.c

/*
 * 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.
 *
 * Copyright (C) Alan Cox GW4PTS ([email protected])
 * Copyright (C) Jonathan Naylor G4KLX ([email protected])
 * Copyright (C) Steven Whitehouse GW7RRM ([email protected])
 * Copyright (C) Joerg Reuter DL1BKE ([email protected])
 * Copyright (C) Hans-Joachim Hetscher DD8NE ([email protected])
 * Copyright (C) Frederic Rible F1OAT ([email protected])
 */

#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 <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 <asm/uaccess.h>
#include <asm/system.h>
#include <linux/fcntl.h>
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/seq_file.h>

static ax25_route *ax25_route_list;
static 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;
	}

	atomic_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      = ' ';
	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;
					}
				}
			}
		}
	}
	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:
	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;
}

static 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,
};

static int ax25_rt_info_open(struct inode *inode, struct file *file)
{
	return seq_open(file, &ax25_rt_seqops);
}

const struct file_operations ax25_route_fops = {
	.owner = THIS_MODULE,
	.open = ax25_rt_info_open,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = seq_release,
};

#endif

/*
 *	Find AX.25 route
 *
 *	Only routes with a reference count of zero can be destroyed.
 */
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;

	read_lock(&ax25_route_lock);
	/*
	 *	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;

	if (ax25_rt != NULL)
		ax25_hold_route(ax25_rt);

	read_unlock(&ax25_route_lock);

	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;

	if ((ax25_rt = ax25_get_route(addr, NULL)) == NULL)
		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) {
		bh_lock_sock(ax25->sk);
		sock_reset_flag(ax25->sk, SOCK_ZAPPED);
		bh_unlock_sock(ax25->sk);
	}

put:
	ax25_put_route(ax25_rt);

	return 0;
}

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

	len = digi->ndigi * AX25_ADDR_LEN;

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

		if (skb->sk != NULL)
			skb_set_owner_w(skbn, skb->sk);

		kfree_skb(skb);

		skb = skbn;
	}

	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
1da177e4 LT	1	/*
	2	* This program is free software; you can redistribute it and/or modify
	3	* it under the terms of the GNU General Public License as published by
	4	* the Free Software Foundation; either version 2 of the License, or
	5	* (at your option) any later version.
	6	*
	7	* Copyright (C) Alan Cox GW4PTS ([email protected])
	8	* Copyright (C) Jonathan Naylor G4KLX ([email protected])
	9	* Copyright (C) Steven Whitehouse GW7RRM ([email protected])
	10	* Copyright (C) Joerg Reuter DL1BKE ([email protected])
	11	* Copyright (C) Hans-Joachim Hetscher DD8NE ([email protected])
	12	* Copyright (C) Frederic Rible F1OAT ([email protected])
	13	*/
4fc268d2 RD	14
4fc268d2 RD	15	#include <linux/capability.h>
1da177e4 LT	16	#include <linux/errno.h>
	17	#include <linux/types.h>
	18	#include <linux/socket.h>
	19	#include <linux/timer.h>
	20	#include <linux/in.h>
	21	#include <linux/kernel.h>
	22	#include <linux/sched.h>
	23	#include <linux/string.h>
	24	#include <linux/sockios.h>
	25	#include <linux/net.h>
	26	#include <net/ax25.h>
	27	#include <linux/inet.h>
	28	#include <linux/netdevice.h>
	29	#include <linux/if_arp.h>
	30	#include <linux/skbuff.h>
	31	#include <linux/spinlock.h>
	32	#include <net/sock.h>
	33	#include <asm/uaccess.h>
	34	#include <asm/system.h>
	35	#include <linux/fcntl.h>
	36	#include <linux/mm.h>
	37	#include <linux/interrupt.h>
	38	#include <linux/init.h>
	39	#include <linux/seq_file.h>
	40
	41	static ax25_route *ax25_route_list;
	42	static DEFINE_RWLOCK(ax25_route_lock);
	43
1da177e4 LT	44	void ax25_rt_device_down(struct net_device *dev)
	45	{
	46	ax25_route s, t, *ax25_rt;
	47
4de211f1	48	write_lock_bh(&ax25_route_lock);
1da177e4 LT	49	ax25_rt = ax25_route_list;
	50	while (ax25_rt != NULL) {
	51	s = ax25_rt;
	52	ax25_rt = ax25_rt->next;
	53
	54	if (s->dev == dev) {
	55	if (ax25_route_list == s) {
	56	ax25_route_list = s->next;
a51482bd	57	kfree(s->digipeat);
1da177e4 LT	58	kfree(s);
	59	} else {
	60	for (t = ax25_route_list; t != NULL; t = t->next) {
	61	if (t->next == s) {
	62	t->next = s->next;
a51482bd	63	kfree(s->digipeat);
1da177e4 LT	64	kfree(s);
	65	break;
	66	}
	67	}
	68	}
	69	}
	70	}
4de211f1	71	write_unlock_bh(&ax25_route_lock);
1da177e4 LT	72	}
1da177e4 LT	73
c9266b99	74	static int __must_check ax25_rt_add(struct ax25_routes_struct *route)
1da177e4 LT	75	{
	76	ax25_route *ax25_rt;
	77	ax25_dev *ax25_dev;
	78	int i;
	79
	80	if ((ax25_dev = ax25_addr_ax25dev(&route->port_addr)) == NULL)
	81	return -EINVAL;
	82	if (route->digi_count > AX25_MAX_DIGIS)
	83	return -EINVAL;
	84
4de211f1	85	write_lock_bh(&ax25_route_lock);
1da177e4 LT	86
	87	ax25_rt = ax25_route_list;
	88	while (ax25_rt != NULL) {
	89	if (ax25cmp(&ax25_rt->callsign, &route->dest_addr) == 0 &&
528930b9	90	ax25_rt->dev == ax25_dev->dev) {
a51482bd JJ	91	kfree(ax25_rt->digipeat);
a51482bd JJ	92	ax25_rt->digipeat = NULL;
1da177e4 LT	93	if (route->digi_count != 0) {
1da177e4 LT	94	if ((ax25_rt->digipeat = kmalloc(sizeof(ax25_digi), GFP_ATOMIC)) == NULL) {
4de211f1	95	write_unlock_bh(&ax25_route_lock);
1da177e4 LT	96	return -ENOMEM;
	97	}
	98	ax25_rt->digipeat->lastrepeat = -1;
	99	ax25_rt->digipeat->ndigi = route->digi_count;
	100	for (i = 0; i < route->digi_count; i++) {
	101	ax25_rt->digipeat->repeated[i] = 0;
	102	ax25_rt->digipeat->calls[i] = route->digi_addr[i];
	103	}
	104	}
4de211f1	105	write_unlock_bh(&ax25_route_lock);
1da177e4 LT	106	return 0;
	107	}
	108	ax25_rt = ax25_rt->next;
	109	}
	110
	111	if ((ax25_rt = kmalloc(sizeof(ax25_route), GFP_ATOMIC)) == NULL) {
4de211f1	112	write_unlock_bh(&ax25_route_lock);
1da177e4 LT	113	return -ENOMEM;
	114	}
	115
006f68b8	116	atomic_set(&ax25_rt->refcount, 1);
1da177e4 LT	117	ax25_rt->callsign = route->dest_addr;
	118	ax25_rt->dev = ax25_dev->dev;
	119	ax25_rt->digipeat = NULL;
	120	ax25_rt->ip_mode = ' ';
	121	if (route->digi_count != 0) {
	122	if ((ax25_rt->digipeat = kmalloc(sizeof(ax25_digi), GFP_ATOMIC)) == NULL) {
4de211f1	123	write_unlock_bh(&ax25_route_lock);
1da177e4 LT	124	kfree(ax25_rt);
	125	return -ENOMEM;
	126	}
	127	ax25_rt->digipeat->lastrepeat = -1;
	128	ax25_rt->digipeat->ndigi = route->digi_count;
	129	for (i = 0; i < route->digi_count; i++) {
	130	ax25_rt->digipeat->repeated[i] = 0;
	131	ax25_rt->digipeat->calls[i] = route->digi_addr[i];
	132	}
	133	}
	134	ax25_rt->next = ax25_route_list;
	135	ax25_route_list = ax25_rt;
4de211f1	136	write_unlock_bh(&ax25_route_lock);
1da177e4 LT	137
	138	return 0;
	139	}
	140
006f68b8	141	void __ax25_put_route(ax25_route *ax25_rt)
1da177e4	142	{
006f68b8 RB	143	kfree(ax25_rt->digipeat);
006f68b8 RB	144	kfree(ax25_rt);
1da177e4 LT	145	}
	146
	147	static int ax25_rt_del(struct ax25_routes_struct *route)
	148	{
	149	ax25_route s, t, *ax25_rt;
	150	ax25_dev *ax25_dev;
	151
	152	if ((ax25_dev = ax25_addr_ax25dev(&route->port_addr)) == NULL)
	153	return -EINVAL;
	154
4de211f1	155	write_lock_bh(&ax25_route_lock);
1da177e4 LT	156
	157	ax25_rt = ax25_route_list;
	158	while (ax25_rt != NULL) {
	159	s = ax25_rt;
	160	ax25_rt = ax25_rt->next;
	161	if (s->dev == ax25_dev->dev &&
	162	ax25cmp(&route->dest_addr, &s->callsign) == 0) {
	163	if (ax25_route_list == s) {
	164	ax25_route_list = s->next;
006f68b8	165	ax25_put_route(s);
1da177e4 LT	166	} else {
	167	for (t = ax25_route_list; t != NULL; t = t->next) {
	168	if (t->next == s) {
	169	t->next = s->next;
006f68b8	170	ax25_put_route(s);
1da177e4 LT	171	break;
	172	}
	173	}
	174	}
	175	}
	176	}
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:
4de211f1	219	write_unlock_bh(&ax25_route_lock);
1da177e4 LT	220	return err;
	221	}
	222
	223	int ax25_rt_ioctl(unsigned int cmd, void __user *arg)
	224	{
	225	struct ax25_route_opt_struct rt_option;
	226	struct ax25_routes_struct route;
	227
	228	switch (cmd) {
	229	case SIOCADDRT:
	230	if (copy_from_user(&route, arg, sizeof(route)))
	231	return -EFAULT;
	232	return ax25_rt_add(&route);
	233
	234	case SIOCDELRT:
	235	if (copy_from_user(&route, arg, sizeof(route)))
	236	return -EFAULT;
	237	return ax25_rt_del(&route);
	238
	239	case SIOCAX25OPTRT:
	240	if (copy_from_user(&rt_option, arg, sizeof(rt_option)))
	241	return -EFAULT;
	242	return ax25_rt_opt(&rt_option);
	243
	244	default:
	245	return -EINVAL;
	246	}
	247	}
	248
	249	#ifdef CONFIG_PROC_FS
	250
	251	static void ax25_rt_seq_start(struct seq_file seq, loff_t *pos)
f16f3026	252	__acquires(ax25_route_lock)
1da177e4 LT	253	{
	254	struct ax25_route *ax25_rt;
	255	int i = 1;
528930b9 YH	256
528930b9 YH	257	read_lock(&ax25_route_lock);
1da177e4 LT	258	if (*pos == 0)
	259	return SEQ_START_TOKEN;
	260
	261	for (ax25_rt = ax25_route_list; ax25_rt != NULL; ax25_rt = ax25_rt->next) {
	262	if (i == *pos)
	263	return ax25_rt;
	264	++i;
	265	}
	266
	267	return NULL;
	268	}
	269
	270	static void ax25_rt_seq_next(struct seq_file seq, void v, loff_t pos)
	271	{
	272	++*pos;
528930b9	273	return (v == SEQ_START_TOKEN) ? ax25_route_list :
1da177e4 LT	274	((struct ax25_route *) v)->next;
	275	}
	276
	277	static void ax25_rt_seq_stop(struct seq_file seq, void v)
f16f3026	278	__releases(ax25_route_lock)
1da177e4 LT	279	{
	280	read_unlock(&ax25_route_lock);
	281	}
	282
	283	static int ax25_rt_seq_show(struct seq_file seq, void v)
	284	{
f75268cd RB	285	char buf[11];
f75268cd RB	286
1da177e4 LT	287	if (v == SEQ_START_TOKEN)
	288	seq_puts(seq, "callsign dev mode digipeaters\n");
	289	else {
	290	struct ax25_route *ax25_rt = v;
	291	const char *callsign;
	292	int i;
	293
	294	if (ax25cmp(&ax25_rt->callsign, &null_ax25_address) == 0)
	295	callsign = "default";
	296	else
f75268cd	297	callsign = ax2asc(buf, &ax25_rt->callsign);
1da177e4 LT	298
	299	seq_printf(seq, "%-9s %-4s",
	300	callsign,
	301	ax25_rt->dev ? ax25_rt->dev->name : "???");
	302
	303	switch (ax25_rt->ip_mode) {
	304	case 'V':
	305	seq_puts(seq, " vc");
	306	break;
	307	case 'D':
	308	seq_puts(seq, " dg");
	309	break;
	310	default:
	311	seq_puts(seq, " *");
	312	break;
	313	}
	314
	315	if (ax25_rt->digipeat != NULL)
	316	for (i = 0; i < ax25_rt->digipeat->ndigi; i++)
f75268cd RB	317	seq_printf(seq, " %s",
f75268cd RB	318	ax2asc(buf, &ax25_rt->digipeat->calls[i]));
1da177e4 LT	319
	320	seq_puts(seq, "\n");
	321	}
	322	return 0;
	323	}
	324
56b3d975	325	static const struct seq_operations ax25_rt_seqops = {
1da177e4 LT	326	.start = ax25_rt_seq_start,
	327	.next = ax25_rt_seq_next,
	328	.stop = ax25_rt_seq_stop,
	329	.show = ax25_rt_seq_show,
	330	};
	331
	332	static int ax25_rt_info_open(struct inode inode, struct file file)
	333	{
	334	return seq_open(file, &ax25_rt_seqops);
	335	}
	336
9a32144e	337	const struct file_operations ax25_route_fops = {
1da177e4 LT	338	.owner = THIS_MODULE,
	339	.open = ax25_rt_info_open,
	340	.read = seq_read,
	341	.llseek = seq_lseek,
	342	.release = seq_release,
	343	};
	344
	345	#endif
	346
	347	/*
	348	* Find AX.25 route
	349	*
3f072310	350	* Only routes with a reference count of zero can be destroyed.
1da177e4	351	*/
006f68b8	352	ax25_route ax25_get_route(ax25_address addr, struct net_device *dev)
1da177e4 LT	353	{
	354	ax25_route *ax25_spe_rt = NULL;
	355	ax25_route *ax25_def_rt = NULL;
	356	ax25_route *ax25_rt;
	357
	358	read_lock(&ax25_route_lock);
	359	/*
	360	* Bind to the physical interface we heard them on, or the default
	361	* route if none is found;
	362	*/
	363	for (ax25_rt = ax25_route_list; ax25_rt != NULL; ax25_rt = ax25_rt->next) {
	364	if (dev == NULL) {
	365	if (ax25cmp(&ax25_rt->callsign, addr) == 0 && ax25_rt->dev != NULL)
	366	ax25_spe_rt = ax25_rt;
	367	if (ax25cmp(&ax25_rt->callsign, &null_ax25_address) == 0 && ax25_rt->dev != NULL)
	368	ax25_def_rt = ax25_rt;
	369	} else {
	370	if (ax25cmp(&ax25_rt->callsign, addr) == 0 && ax25_rt->dev == dev)
	371	ax25_spe_rt = ax25_rt;
	372	if (ax25cmp(&ax25_rt->callsign, &null_ax25_address) == 0 && ax25_rt->dev == dev)
	373	ax25_def_rt = ax25_rt;
	374	}
	375	}
	376
	377	ax25_rt = ax25_def_rt;
	378	if (ax25_spe_rt != NULL)
	379	ax25_rt = ax25_spe_rt;
	380
	381	if (ax25_rt != NULL)
006f68b8	382	ax25_hold_route(ax25_rt);
1da177e4 LT	383
	384	read_unlock(&ax25_route_lock);
	385
	386	return ax25_rt;
	387	}
	388
	389	/*
	390	* Adjust path: If you specify a default route and want to connect
	391	* a target on the digipeater path but w/o having a special route
	392	* set before, the path has to be truncated from your target on.
	393	*/
	394	static inline void ax25_adjust_path(ax25_address addr, ax25_digi digipeat)
	395	{
	396	int k;
	397
	398	for (k = 0; k < digipeat->ndigi; k++) {
	399	if (ax25cmp(addr, &digipeat->calls[k]) == 0)
	400	break;
	401	}
	402
	403	digipeat->ndigi = k;
	404	}
	405
	406
	407	/*
	408	* Find which interface to use.
	409	*/
	410	int ax25_rt_autobind(ax25_cb ax25, ax25_address addr)
	411	{
01d7dd0e	412	ax25_uid_assoc *user;
1da177e4	413	ax25_route *ax25_rt;
1da177e4 LT	414	int err;
	415
	416	if ((ax25_rt = ax25_get_route(addr, NULL)) == NULL)
	417	return -EHOSTUNREACH;
	418
	419	if ((ax25->ax25_dev = ax25_dev_ax25dev(ax25_rt->dev)) == NULL) {
	420	err = -EHOSTUNREACH;
	421	goto put;
	422	}
	423
73400407	424	user = ax25_findbyuid(current_euid());
01d7dd0e RB	425	if (user) {
	426	ax25->source_addr = user->call;
	427	ax25_uid_put(user);
	428	} else {
1da177e4 LT	429	if (ax25_uid_policy && !capable(CAP_NET_BIND_SERVICE)) {
	430	err = -EPERM;
	431	goto put;
	432	}
01d7dd0e	433	ax25->source_addr = (ax25_address )ax25->ax25_dev->dev->dev_addr;
1da177e4 LT	434	}
1da177e4 LT	435
1da177e4	436	if (ax25_rt->digipeat != NULL) {
0459d70a ACM	437	ax25->digipeat = kmemdup(ax25_rt->digipeat, sizeof(ax25_digi),
	438	GFP_ATOMIC);
	439	if (ax25->digipeat == NULL) {
1da177e4 LT	440	err = -ENOMEM;
	441	goto put;
	442	}
1da177e4 LT	443	ax25_adjust_path(addr, ax25->digipeat);
	444	}
	445
	446	if (ax25->sk != NULL) {
	447	bh_lock_sock(ax25->sk);
	448	sock_reset_flag(ax25->sk, SOCK_ZAPPED);
	449	bh_unlock_sock(ax25->sk);
	450	}
	451
	452	put:
	453	ax25_put_route(ax25_rt);
	454
	455	return 0;
	456	}
	457
1da177e4 LT	458	struct sk_buff ax25_rt_build_path(struct sk_buff skb, ax25_address *src,
	459	ax25_address dest, ax25_digi digi)
	460	{
	461	struct sk_buff *skbn;
	462	unsigned char *bp;
	463	int len;
	464
	465	len = digi->ndigi * AX25_ADDR_LEN;
	466
	467	if (skb_headroom(skb) < len) {
	468	if ((skbn = skb_realloc_headroom(skb, len)) == NULL) {
	469	printk(KERN_CRIT "AX.25: ax25_dg_build_path - out of memory\n");
	470	return NULL;
	471	}
	472
	473	if (skb->sk != NULL)
	474	skb_set_owner_w(skbn, skb->sk);
	475
	476	kfree_skb(skb);
	477
	478	skb = skbn;
	479	}
	480
	481	bp = skb_push(skb, len);
	482
	483	ax25_addr_build(bp, src, dest, digi, AX25_COMMAND, AX25_MODULUS);
	484
	485	return skb;
	486	}
	487
	488	/*
	489	* Free all memory associated with routing structures.
	490	*/
	491	void __exit ax25_rt_free(void)
	492	{
	493	ax25_route s, ax25_rt = ax25_route_list;
	494
4de211f1	495	write_lock_bh(&ax25_route_lock);
1da177e4 LT	496	while (ax25_rt != NULL) {
	497	s = ax25_rt;
	498	ax25_rt = ax25_rt->next;
	499
a51482bd	500	kfree(s->digipeat);
1da177e4 LT	501	kfree(s);
1da177e4 LT	502	}
4de211f1	503	write_unlock_bh(&ax25_route_lock);
1da177e4	504	}