[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 <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 <asm/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;
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 = 0;

	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 err;
}

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);

		consume_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>
5a0e3ad6	26	#include <linux/slab.h>
1da177e4 LT	27	#include <net/ax25.h>
	28	#include <linux/inet.h>
	29	#include <linux/netdevice.h>
	30	#include <linux/if_arp.h>
	31	#include <linux/skbuff.h>
	32	#include <linux/spinlock.h>
	33	#include <net/sock.h>
	34	#include <asm/uaccess.h>
1da177e4 LT	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>
bc3b2d7f	40	#include <linux/export.h>
1da177e4 LT	41
	42	static ax25_route *ax25_route_list;
	43	static DEFINE_RWLOCK(ax25_route_lock);
	44
1da177e4 LT	45	void ax25_rt_device_down(struct net_device *dev)
	46	{
	47	ax25_route s, t, *ax25_rt;
	48
4de211f1	49	write_lock_bh(&ax25_route_lock);
1da177e4 LT	50	ax25_rt = ax25_route_list;
	51	while (ax25_rt != NULL) {
	52	s = ax25_rt;
	53	ax25_rt = ax25_rt->next;
	54
	55	if (s->dev == dev) {
	56	if (ax25_route_list == s) {
	57	ax25_route_list = s->next;
a51482bd	58	kfree(s->digipeat);
1da177e4 LT	59	kfree(s);
	60	} else {
	61	for (t = ax25_route_list; t != NULL; t = t->next) {
	62	if (t->next == s) {
	63	t->next = s->next;
a51482bd	64	kfree(s->digipeat);
1da177e4 LT	65	kfree(s);
	66	break;
	67	}
	68	}
	69	}
	70	}
	71	}
4de211f1	72	write_unlock_bh(&ax25_route_lock);
1da177e4 LT	73	}
1da177e4 LT	74
c9266b99	75	static int __must_check ax25_rt_add(struct ax25_routes_struct *route)
1da177e4 LT	76	{
	77	ax25_route *ax25_rt;
	78	ax25_dev *ax25_dev;
	79	int i;
	80
	81	if ((ax25_dev = ax25_addr_ax25dev(&route->port_addr)) == NULL)
	82	return -EINVAL;
	83	if (route->digi_count > AX25_MAX_DIGIS)
	84	return -EINVAL;
	85
4de211f1	86	write_lock_bh(&ax25_route_lock);
1da177e4 LT	87
	88	ax25_rt = ax25_route_list;
	89	while (ax25_rt != NULL) {
	90	if (ax25cmp(&ax25_rt->callsign, &route->dest_addr) == 0 &&
528930b9	91	ax25_rt->dev == ax25_dev->dev) {
a51482bd JJ	92	kfree(ax25_rt->digipeat);
a51482bd JJ	93	ax25_rt->digipeat = NULL;
1da177e4 LT	94	if (route->digi_count != 0) {
1da177e4 LT	95	if ((ax25_rt->digipeat = kmalloc(sizeof(ax25_digi), GFP_ATOMIC)) == NULL) {
4de211f1	96	write_unlock_bh(&ax25_route_lock);
1da177e4 LT	97	return -ENOMEM;
	98	}
	99	ax25_rt->digipeat->lastrepeat = -1;
	100	ax25_rt->digipeat->ndigi = route->digi_count;
	101	for (i = 0; i < route->digi_count; i++) {
	102	ax25_rt->digipeat->repeated[i] = 0;
	103	ax25_rt->digipeat->calls[i] = route->digi_addr[i];
	104	}
	105	}
4de211f1	106	write_unlock_bh(&ax25_route_lock);
1da177e4 LT	107	return 0;
	108	}
	109	ax25_rt = ax25_rt->next;
	110	}
	111
	112	if ((ax25_rt = kmalloc(sizeof(ax25_route), GFP_ATOMIC)) == NULL) {
4de211f1	113	write_unlock_bh(&ax25_route_lock);
1da177e4 LT	114	return -ENOMEM;
	115	}
	116
006f68b8	117	atomic_set(&ax25_rt->refcount, 1);
1da177e4 LT	118	ax25_rt->callsign = route->dest_addr;
	119	ax25_rt->dev = ax25_dev->dev;
	120	ax25_rt->digipeat = NULL;
	121	ax25_rt->ip_mode = ' ';
	122	if (route->digi_count != 0) {
	123	if ((ax25_rt->digipeat = kmalloc(sizeof(ax25_digi), GFP_ATOMIC)) == NULL) {
4de211f1	124	write_unlock_bh(&ax25_route_lock);
1da177e4 LT	125	kfree(ax25_rt);
	126	return -ENOMEM;
	127	}
	128	ax25_rt->digipeat->lastrepeat = -1;
	129	ax25_rt->digipeat->ndigi = route->digi_count;
	130	for (i = 0; i < route->digi_count; i++) {
	131	ax25_rt->digipeat->repeated[i] = 0;
	132	ax25_rt->digipeat->calls[i] = route->digi_addr[i];
	133	}
	134	}
	135	ax25_rt->next = ax25_route_list;
	136	ax25_route_list = ax25_rt;
4de211f1	137	write_unlock_bh(&ax25_route_lock);
1da177e4 LT	138
	139	return 0;
	140	}
	141
006f68b8	142	void __ax25_put_route(ax25_route *ax25_rt)
1da177e4	143	{
006f68b8 RB	144	kfree(ax25_rt->digipeat);
006f68b8 RB	145	kfree(ax25_rt);
1da177e4 LT	146	}
	147
	148	static int ax25_rt_del(struct ax25_routes_struct *route)
	149	{
	150	ax25_route s, t, *ax25_rt;
	151	ax25_dev *ax25_dev;
	152
	153	if ((ax25_dev = ax25_addr_ax25dev(&route->port_addr)) == NULL)
	154	return -EINVAL;
	155
4de211f1	156	write_lock_bh(&ax25_route_lock);
1da177e4 LT	157
	158	ax25_rt = ax25_route_list;
	159	while (ax25_rt != NULL) {
	160	s = ax25_rt;
	161	ax25_rt = ax25_rt->next;
	162	if (s->dev == ax25_dev->dev &&
	163	ax25cmp(&route->dest_addr, &s->callsign) == 0) {
	164	if (ax25_route_list == s) {
	165	ax25_route_list = s->next;
006f68b8	166	ax25_put_route(s);
1da177e4 LT	167	} else {
	168	for (t = ax25_route_list; t != NULL; t = t->next) {
	169	if (t->next == s) {
	170	t->next = s->next;
006f68b8	171	ax25_put_route(s);
1da177e4 LT	172	break;
	173	}
	174	}
	175	}
	176	}
	177	}
4de211f1	178	write_unlock_bh(&ax25_route_lock);
1da177e4 LT	179
	180	return 0;
	181	}
	182
	183	static int ax25_rt_opt(struct ax25_route_opt_struct *rt_option)
	184	{
	185	ax25_route *ax25_rt;
	186	ax25_dev *ax25_dev;
	187	int err = 0;
	188
	189	if ((ax25_dev = ax25_addr_ax25dev(&rt_option->port_addr)) == NULL)
	190	return -EINVAL;
	191
4de211f1	192	write_lock_bh(&ax25_route_lock);
1da177e4 LT	193
	194	ax25_rt = ax25_route_list;
	195	while (ax25_rt != NULL) {
	196	if (ax25_rt->dev == ax25_dev->dev &&
	197	ax25cmp(&rt_option->dest_addr, &ax25_rt->callsign) == 0) {
	198	switch (rt_option->cmd) {
	199	case AX25_SET_RT_IPMODE:
	200	switch (rt_option->arg) {
	201	case ' ':
	202	case 'D':
	203	case 'V':
	204	ax25_rt->ip_mode = rt_option->arg;
	205	break;
	206	default:
	207	err = -EINVAL;
	208	goto out;
	209	}
	210	break;
	211	default:
	212	err = -EINVAL;
	213	goto out;
	214	}
	215	}
	216	ax25_rt = ax25_rt->next;
	217	}
	218
	219	out:
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
56b3d975	326	static 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	};
	332
	333	static int ax25_rt_info_open(struct inode inode, struct file file)
	334	{
	335	return seq_open(file, &ax25_rt_seqops);
	336	}
	337
9a32144e	338	const struct file_operations ax25_route_fops = {
1da177e4 LT	339	.owner = THIS_MODULE,
	340	.open = ax25_rt_info_open,
	341	.read = seq_read,
	342	.llseek = seq_lseek,
	343	.release = seq_release,
	344	};
	345
	346	#endif
	347
	348	/*
	349	* Find AX.25 route
	350	*
3f072310	351	* Only routes with a reference count of zero can be destroyed.
1da177e4	352	*/
006f68b8	353	ax25_route ax25_get_route(ax25_address addr, struct net_device *dev)
1da177e4 LT	354	{
	355	ax25_route *ax25_spe_rt = NULL;
	356	ax25_route *ax25_def_rt = NULL;
	357	ax25_route *ax25_rt;
	358
	359	read_lock(&ax25_route_lock);
	360	/*
	361	* Bind to the physical interface we heard them on, or the default
	362	* route if none is found;
	363	*/
	364	for (ax25_rt = ax25_route_list; ax25_rt != NULL; ax25_rt = ax25_rt->next) {
	365	if (dev == NULL) {
	366	if (ax25cmp(&ax25_rt->callsign, addr) == 0 && ax25_rt->dev != NULL)
	367	ax25_spe_rt = ax25_rt;
	368	if (ax25cmp(&ax25_rt->callsign, &null_ax25_address) == 0 && ax25_rt->dev != NULL)
	369	ax25_def_rt = ax25_rt;
	370	} else {
	371	if (ax25cmp(&ax25_rt->callsign, addr) == 0 && ax25_rt->dev == dev)
	372	ax25_spe_rt = ax25_rt;
	373	if (ax25cmp(&ax25_rt->callsign, &null_ax25_address) == 0 && ax25_rt->dev == dev)
	374	ax25_def_rt = ax25_rt;
	375	}
	376	}
	377
	378	ax25_rt = ax25_def_rt;
	379	if (ax25_spe_rt != NULL)
	380	ax25_rt = ax25_spe_rt;
	381
	382	if (ax25_rt != NULL)
006f68b8	383	ax25_hold_route(ax25_rt);
1da177e4 LT	384
	385	read_unlock(&ax25_route_lock);
	386
	387	return ax25_rt;
	388	}
	389
	390	/*
	391	* Adjust path: If you specify a default route and want to connect
	392	* a target on the digipeater path but w/o having a special route
	393	* set before, the path has to be truncated from your target on.
	394	*/
	395	static inline void ax25_adjust_path(ax25_address addr, ax25_digi digipeat)
	396	{
	397	int k;
	398
	399	for (k = 0; k < digipeat->ndigi; k++) {
	400	if (ax25cmp(addr, &digipeat->calls[k]) == 0)
	401	break;
	402	}
	403
	404	digipeat->ndigi = k;
	405	}
	406
	407
	408	/*
	409	* Find which interface to use.
	410	*/
	411	int ax25_rt_autobind(ax25_cb ax25, ax25_address addr)
	412	{
01d7dd0e	413	ax25_uid_assoc *user;
1da177e4	414	ax25_route *ax25_rt;
b3d18f15	415	int err = 0;
1da177e4 LT	416
	417	if ((ax25_rt = ax25_get_route(addr, NULL)) == NULL)
	418	return -EHOSTUNREACH;
	419
	420	if ((ax25->ax25_dev = ax25_dev_ax25dev(ax25_rt->dev)) == NULL) {
	421	err = -EHOSTUNREACH;
	422	goto put;
	423	}
	424
73400407	425	user = ax25_findbyuid(current_euid());
01d7dd0e RB	426	if (user) {
	427	ax25->source_addr = user->call;
	428	ax25_uid_put(user);
	429	} else {
1da177e4 LT	430	if (ax25_uid_policy && !capable(CAP_NET_BIND_SERVICE)) {
	431	err = -EPERM;
	432	goto put;
	433	}
01d7dd0e	434	ax25->source_addr = (ax25_address )ax25->ax25_dev->dev->dev_addr;
1da177e4 LT	435	}
1da177e4 LT	436
1da177e4	437	if (ax25_rt->digipeat != NULL) {
0459d70a ACM	438	ax25->digipeat = kmemdup(ax25_rt->digipeat, sizeof(ax25_digi),
	439	GFP_ATOMIC);
	440	if (ax25->digipeat == NULL) {
1da177e4 LT	441	err = -ENOMEM;
	442	goto put;
	443	}
1da177e4 LT	444	ax25_adjust_path(addr, ax25->digipeat);
	445	}
	446
	447	if (ax25->sk != NULL) {
	448	bh_lock_sock(ax25->sk);
	449	sock_reset_flag(ax25->sk, SOCK_ZAPPED);
	450	bh_unlock_sock(ax25->sk);
	451	}
	452
	453	put:
	454	ax25_put_route(ax25_rt);
	455
b3d18f15	456	return err;
1da177e4 LT	457	}
1da177e4 LT	458
1da177e4 LT	459	struct sk_buff ax25_rt_build_path(struct sk_buff skb, ax25_address *src,
	460	ax25_address dest, ax25_digi digi)
	461	{
	462	struct sk_buff *skbn;
	463	unsigned char *bp;
	464	int len;
	465
	466	len = digi->ndigi * AX25_ADDR_LEN;
	467
	468	if (skb_headroom(skb) < len) {
	469	if ((skbn = skb_realloc_headroom(skb, len)) == NULL) {
	470	printk(KERN_CRIT "AX.25: ax25_dg_build_path - out of memory\n");
	471	return NULL;
	472	}
	473
	474	if (skb->sk != NULL)
	475	skb_set_owner_w(skbn, skb->sk);
	476
5d0ba55b	477	consume_skb(skb);
1da177e4 LT	478
	479	skb = skbn;
	480	}
	481
	482	bp = skb_push(skb, len);
	483
	484	ax25_addr_build(bp, src, dest, digi, AX25_COMMAND, AX25_MODULUS);
	485
	486	return skb;
	487	}
	488
	489	/*
	490	* Free all memory associated with routing structures.
	491	*/
	492	void __exit ax25_rt_free(void)
	493	{
	494	ax25_route s, ax25_rt = ax25_route_list;
	495
4de211f1	496	write_lock_bh(&ax25_route_lock);
1da177e4 LT	497	while (ax25_rt != NULL) {
	498	s = ax25_rt;
	499	ax25_rt = ax25_rt->next;
	500
a51482bd	501	kfree(s->digipeat);
1da177e4 LT	502	kfree(s);
1da177e4 LT	503	}
4de211f1	504	write_unlock_bh(&ax25_route_lock);
1da177e4	505	}