[net-next-2.6.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 (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 <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);

static ax25_route *ax25_get_route(ax25_address *, struct net_device *);

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

	write_lock(&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(&ax25_route_lock);
}

static int 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(&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(&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(&ax25_route_lock);
			return 0;
		}
		ax25_rt = ax25_rt->next;
	}

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

	atomic_set(&ax25_rt->ref, 0);
	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(&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(&ax25_route_lock);

	return 0;
}

static void ax25_rt_destroy(ax25_route *ax25_rt)
{
	if (atomic_read(&ax25_rt->ref) == 0) {
		kfree(ax25_rt->digipeat);
		kfree(ax25_rt);
		return;
	}

	/*
	 * Uh...  Route is still in use; we can't yet destroy it.  Retry later.
	 */
	init_timer(&ax25_rt->timer);
	ax25_rt->timer.data	= (unsigned long) ax25_rt;
	ax25_rt->timer.function	= (void *) ax25_rt_destroy;
	ax25_rt->timer.expires	= jiffies + 5 * HZ;

	add_timer(&ax25_rt->timer);
}

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(&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_rt_destroy(s);
			} else {
				for (t = ax25_route_list; t != NULL; t = t->next) {
					if (t->next == s) {
						t->next = s->next;
						ax25_rt_destroy(s);
						break;
					}
				}
			}
		}
	}
	write_unlock(&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(&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(&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)
{
	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)
{
	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 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);
}

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 refernce rout of zero can be destroyed.
 */
static 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)
		atomic_inc(&ax25_rt->ref);

	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) {
		if ((ax25->digipeat = kmalloc(sizeof(ax25_digi), GFP_ATOMIC)) == NULL) {
			err = -ENOMEM;
			goto put;
		}
		memcpy(ax25->digipeat, ax25_rt->digipeat, sizeof(ax25_digi));
		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;
}

ax25_route *ax25_rt_find_route(ax25_route * route, ax25_address *addr,
	struct net_device *dev)
{
	ax25_route *ax25_rt;

	if ((ax25_rt = ax25_get_route(addr, dev)))
		return ax25_rt;

	route->next     = NULL;
	atomic_set(&route->ref, 1);
	route->callsign = *addr;
	route->dev      = dev;
	route->digipeat = NULL;
	route->ip_mode  = ' ';

	return route;
}

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

		kfree(s->digipeat);
		kfree(s);
	}
	write_unlock(&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 (alan@lxorguk.ukuu.org.uk)
	8	* Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
	9	* Copyright (C) Steven Whitehouse GW7RRM (stevew@acm.org)
	10	* Copyright (C) Joerg Reuter DL1BKE (jreuter@yaina.de)
	11	* Copyright (C) Hans-Joachim Hetscher DD8NE (dd8ne@bnv-bamberg.de)
	12	* Copyright (C) Frederic Rible F1OAT (frible@teaser.fr)
	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
	44	static ax25_route ax25_get_route(ax25_address , struct net_device *);
	45
	46	void ax25_rt_device_down(struct net_device *dev)
	47	{
	48	ax25_route s, t, *ax25_rt;
	49
	50	write_lock(&ax25_route_lock);
	51	ax25_rt = ax25_route_list;
	52	while (ax25_rt != NULL) {
	53	s = ax25_rt;
	54	ax25_rt = ax25_rt->next;
	55
	56	if (s->dev == dev) {
	57	if (ax25_route_list == s) {
	58	ax25_route_list = s->next;
a51482bd	59	kfree(s->digipeat);
1da177e4 LT	60	kfree(s);
	61	} else {
	62	for (t = ax25_route_list; t != NULL; t = t->next) {
	63	if (t->next == s) {
	64	t->next = s->next;
a51482bd	65	kfree(s->digipeat);
1da177e4 LT	66	kfree(s);
	67	break;
	68	}
	69	}
	70	}
	71	}
	72	}
	73	write_unlock(&ax25_route_lock);
	74	}
	75
	76	static int ax25_rt_add(struct ax25_routes_struct *route)
	77	{
	78	ax25_route *ax25_rt;
	79	ax25_dev *ax25_dev;
	80	int i;
	81
	82	if ((ax25_dev = ax25_addr_ax25dev(&route->port_addr)) == NULL)
	83	return -EINVAL;
	84	if (route->digi_count > AX25_MAX_DIGIS)
	85	return -EINVAL;
	86
	87	write_lock(&ax25_route_lock);
	88
	89	ax25_rt = ax25_route_list;
	90	while (ax25_rt != NULL) {
	91	if (ax25cmp(&ax25_rt->callsign, &route->dest_addr) == 0 &&
	92	ax25_rt->dev == ax25_dev->dev) {
a51482bd JJ	93	kfree(ax25_rt->digipeat);
a51482bd JJ	94	ax25_rt->digipeat = NULL;
1da177e4 LT	95	if (route->digi_count != 0) {
	96	if ((ax25_rt->digipeat = kmalloc(sizeof(ax25_digi), GFP_ATOMIC)) == NULL) {
	97	write_unlock(&ax25_route_lock);
	98	return -ENOMEM;
	99	}
	100	ax25_rt->digipeat->lastrepeat = -1;
	101	ax25_rt->digipeat->ndigi = route->digi_count;
	102	for (i = 0; i < route->digi_count; i++) {
	103	ax25_rt->digipeat->repeated[i] = 0;
	104	ax25_rt->digipeat->calls[i] = route->digi_addr[i];
	105	}
	106	}
	107	write_unlock(&ax25_route_lock);
	108	return 0;
	109	}
	110	ax25_rt = ax25_rt->next;
	111	}
	112
	113	if ((ax25_rt = kmalloc(sizeof(ax25_route), GFP_ATOMIC)) == NULL) {
	114	write_unlock(&ax25_route_lock);
	115	return -ENOMEM;
	116	}
	117
	118	atomic_set(&ax25_rt->ref, 0);
	119	ax25_rt->callsign = route->dest_addr;
	120	ax25_rt->dev = ax25_dev->dev;
	121	ax25_rt->digipeat = NULL;
	122	ax25_rt->ip_mode = ' ';
	123	if (route->digi_count != 0) {
	124	if ((ax25_rt->digipeat = kmalloc(sizeof(ax25_digi), GFP_ATOMIC)) == NULL) {
	125	write_unlock(&ax25_route_lock);
	126	kfree(ax25_rt);
	127	return -ENOMEM;
	128	}
	129	ax25_rt->digipeat->lastrepeat = -1;
	130	ax25_rt->digipeat->ndigi = route->digi_count;
	131	for (i = 0; i < route->digi_count; i++) {
	132	ax25_rt->digipeat->repeated[i] = 0;
	133	ax25_rt->digipeat->calls[i] = route->digi_addr[i];
	134	}
	135	}
	136	ax25_rt->next = ax25_route_list;
	137	ax25_route_list = ax25_rt;
	138	write_unlock(&ax25_route_lock);
	139
	140	return 0;
	141	}
	142
	143	static void ax25_rt_destroy(ax25_route *ax25_rt)
	144	{
	145	if (atomic_read(&ax25_rt->ref) == 0) {
a51482bd	146	kfree(ax25_rt->digipeat);
1da177e4 LT	147	kfree(ax25_rt);
	148	return;
	149	}
	150
	151	/*
	152	* Uh... Route is still in use; we can't yet destroy it. Retry later.
	153	*/
	154	init_timer(&ax25_rt->timer);
	155	ax25_rt->timer.data = (unsigned long) ax25_rt;
	156	ax25_rt->timer.function = (void *) ax25_rt_destroy;
	157	ax25_rt->timer.expires = jiffies + 5 * HZ;
	158
	159	add_timer(&ax25_rt->timer);
	160	}
	161
	162	static int ax25_rt_del(struct ax25_routes_struct *route)
	163	{
	164	ax25_route s, t, *ax25_rt;
	165	ax25_dev *ax25_dev;
	166
	167	if ((ax25_dev = ax25_addr_ax25dev(&route->port_addr)) == NULL)
	168	return -EINVAL;
	169
	170	write_lock(&ax25_route_lock);
	171
	172	ax25_rt = ax25_route_list;
	173	while (ax25_rt != NULL) {
	174	s = ax25_rt;
	175	ax25_rt = ax25_rt->next;
	176	if (s->dev == ax25_dev->dev &&
	177	ax25cmp(&route->dest_addr, &s->callsign) == 0) {
	178	if (ax25_route_list == s) {
	179	ax25_route_list = s->next;
	180	ax25_rt_destroy(s);
	181	} else {
	182	for (t = ax25_route_list; t != NULL; t = t->next) {
	183	if (t->next == s) {
	184	t->next = s->next;
	185	ax25_rt_destroy(s);
	186	break;
	187	}
	188	}
	189	}
	190	}
	191	}
	192	write_unlock(&ax25_route_lock);
	193
	194	return 0;
	195	}
	196
	197	static int ax25_rt_opt(struct ax25_route_opt_struct *rt_option)
	198	{
	199	ax25_route *ax25_rt;
	200	ax25_dev *ax25_dev;
	201	int err = 0;
	202
	203	if ((ax25_dev = ax25_addr_ax25dev(&rt_option->port_addr)) == NULL)
	204	return -EINVAL;
	205
	206	write_lock(&ax25_route_lock);
	207
	208	ax25_rt = ax25_route_list;
	209	while (ax25_rt != NULL) {
	210	if (ax25_rt->dev == ax25_dev->dev &&
211	ax25cmp(&rt_option->dest_addr, &ax25_rt->callsign) == 0) {
212	switch (rt_option->cmd) {
213	case AX25_SET_RT_IPMODE:
214	switch (rt_option->arg) {
215	case ' ':
216	case 'D':
217	case 'V':
218	ax25_rt->ip_mode = rt_option->arg;
219	break;
220	default:
221	err = -EINVAL;
222	goto out;
223	}
224	break;
225	default:
226	err = -EINVAL;
227	goto out;
228	}
229	}
230	ax25_rt = ax25_rt->next;
231	}
232
233	out:
234	write_unlock(&ax25_route_lock);
235	return err;
236	}
237
238	int ax25_rt_ioctl(unsigned int cmd, void __user *arg)
239	{
240	struct ax25_route_opt_struct rt_option;
241	struct ax25_routes_struct route;
242
243	switch (cmd) {
244	case SIOCADDRT:
245	if (copy_from_user(&route, arg, sizeof(route)))
246	return -EFAULT;
247	return ax25_rt_add(&route);
248
249	case SIOCDELRT:
250	if (copy_from_user(&route, arg, sizeof(route)))
251	return -EFAULT;
252	return ax25_rt_del(&route);
253
254	case SIOCAX25OPTRT:
255	if (copy_from_user(&rt_option, arg, sizeof(rt_option)))
256	return -EFAULT;
257	return ax25_rt_opt(&rt_option);
258
259	default:
260	return -EINVAL;
261	}
262	}
263
264	#ifdef CONFIG_PROC_FS
265
266	static void ax25_rt_seq_start(struct seq_file seq, loff_t *pos)
267	{
268	struct ax25_route *ax25_rt;
269	int i = 1;
270
271	read_lock(&ax25_route_lock);
272	if (*pos == 0)
273	return SEQ_START_TOKEN;
274
275	for (ax25_rt = ax25_route_list; ax25_rt != NULL; ax25_rt = ax25_rt->next) {
276	if (i == *pos)
277	return ax25_rt;
278	++i;
279	}
280
281	return NULL;
282	}
283
284	static void ax25_rt_seq_next(struct seq_file seq, void v, loff_t pos)
285	{
286	++*pos;
287	return (v == SEQ_START_TOKEN) ? ax25_route_list :
288	((struct ax25_route *) v)->next;
289	}
290
291	static void ax25_rt_seq_stop(struct seq_file seq, void v)
292	{
293	read_unlock(&ax25_route_lock);
294	}
295
296	static int ax25_rt_seq_show(struct seq_file seq, void v)
297	{
f75268cd RB	298	char buf[11];
f75268cd RB	299
1da177e4 LT	300	if (v == SEQ_START_TOKEN)
	301	seq_puts(seq, "callsign dev mode digipeaters\n");
	302	else {
	303	struct ax25_route *ax25_rt = v;
	304	const char *callsign;
	305	int i;
	306
	307	if (ax25cmp(&ax25_rt->callsign, &null_ax25_address) == 0)
	308	callsign = "default";
	309	else
f75268cd	310	callsign = ax2asc(buf, &ax25_rt->callsign);
1da177e4 LT	311
	312	seq_printf(seq, "%-9s %-4s",
	313	callsign,
	314	ax25_rt->dev ? ax25_rt->dev->name : "???");
	315
	316	switch (ax25_rt->ip_mode) {
	317	case 'V':
	318	seq_puts(seq, " vc");
	319	break;
	320	case 'D':
	321	seq_puts(seq, " dg");
	322	break;
	323	default:
	324	seq_puts(seq, " *");
	325	break;
	326	}
	327
	328	if (ax25_rt->digipeat != NULL)
	329	for (i = 0; i < ax25_rt->digipeat->ndigi; i++)
f75268cd RB	330	seq_printf(seq, " %s",
f75268cd RB	331	ax2asc(buf, &ax25_rt->digipeat->calls[i]));
1da177e4 LT	332
	333	seq_puts(seq, "\n");
	334	}
	335	return 0;
	336	}
	337
	338	static struct seq_operations ax25_rt_seqops = {
	339	.start = ax25_rt_seq_start,
	340	.next = ax25_rt_seq_next,
	341	.stop = ax25_rt_seq_stop,
	342	.show = ax25_rt_seq_show,
	343	};
	344
	345	static int ax25_rt_info_open(struct inode inode, struct file file)
	346	{
	347	return seq_open(file, &ax25_rt_seqops);
	348	}
	349
	350	struct file_operations ax25_route_fops = {
	351	.owner = THIS_MODULE,
	352	.open = ax25_rt_info_open,
	353	.read = seq_read,
	354	.llseek = seq_lseek,
	355	.release = seq_release,
	356	};
	357
	358	#endif
	359
	360	/*
	361	* Find AX.25 route
	362	*
	363	* Only routes with a refernce rout of zero can be destroyed.
	364	*/
	365	static ax25_route ax25_get_route(ax25_address addr, struct net_device *dev)
	366	{
	367	ax25_route *ax25_spe_rt = NULL;
	368	ax25_route *ax25_def_rt = NULL;
	369	ax25_route *ax25_rt;
	370
	371	read_lock(&ax25_route_lock);
	372	/*
	373	* Bind to the physical interface we heard them on, or the default
	374	* route if none is found;
	375	*/
	376	for (ax25_rt = ax25_route_list; ax25_rt != NULL; ax25_rt = ax25_rt->next) {
	377	if (dev == NULL) {
	378	if (ax25cmp(&ax25_rt->callsign, addr) == 0 && ax25_rt->dev != NULL)
	379	ax25_spe_rt = ax25_rt;
	380	if (ax25cmp(&ax25_rt->callsign, &null_ax25_address) == 0 && ax25_rt->dev != NULL)
	381	ax25_def_rt = ax25_rt;
	382	} else {
	383	if (ax25cmp(&ax25_rt->callsign, addr) == 0 && ax25_rt->dev == dev)
	384	ax25_spe_rt = ax25_rt;
	385	if (ax25cmp(&ax25_rt->callsign, &null_ax25_address) == 0 && ax25_rt->dev == dev)
	386	ax25_def_rt = ax25_rt;
	387	}
	388	}
	389
	390	ax25_rt = ax25_def_rt;
	391	if (ax25_spe_rt != NULL)
	392	ax25_rt = ax25_spe_rt;
	393
	394	if (ax25_rt != NULL)
	395	atomic_inc(&ax25_rt->ref);
396
397	read_unlock(&ax25_route_lock);
398
399	return ax25_rt;
400	}
401
402	/*
403	* Adjust path: If you specify a default route and want to connect
404	* a target on the digipeater path but w/o having a special route
405	* set before, the path has to be truncated from your target on.
406	*/
407	static inline void ax25_adjust_path(ax25_address addr, ax25_digi digipeat)
408	{
409	int k;
410
411	for (k = 0; k < digipeat->ndigi; k++) {
412	if (ax25cmp(addr, &digipeat->calls[k]) == 0)
413	break;
414	}
415
416	digipeat->ndigi = k;
417	}
418
419
420	/*
421	* Find which interface to use.
422	*/
423	int ax25_rt_autobind(ax25_cb ax25, ax25_address addr)
424	{
01d7dd0e	425	ax25_uid_assoc *user;
1da177e4	426	ax25_route *ax25_rt;
1da177e4 LT	427	int err;
	428
	429	if ((ax25_rt = ax25_get_route(addr, NULL)) == NULL)
	430	return -EHOSTUNREACH;
	431
	432	if ((ax25->ax25_dev = ax25_dev_ax25dev(ax25_rt->dev)) == NULL) {
	433	err = -EHOSTUNREACH;
	434	goto put;
	435	}
	436
01d7dd0e RB	437	user = ax25_findbyuid(current->euid);
	438	if (user) {
	439	ax25->source_addr = user->call;
	440	ax25_uid_put(user);
	441	} else {
1da177e4 LT	442	if (ax25_uid_policy && !capable(CAP_NET_BIND_SERVICE)) {
	443	err = -EPERM;
	444	goto put;
	445	}
01d7dd0e	446	ax25->source_addr = (ax25_address )ax25->ax25_dev->dev->dev_addr;
1da177e4 LT	447	}
1da177e4 LT	448
1da177e4 LT	449	if (ax25_rt->digipeat != NULL) {
	450	if ((ax25->digipeat = kmalloc(sizeof(ax25_digi), GFP_ATOMIC)) == NULL) {
	451	err = -ENOMEM;
	452	goto put;
	453	}
	454	memcpy(ax25->digipeat, ax25_rt->digipeat, sizeof(ax25_digi));
	455	ax25_adjust_path(addr, ax25->digipeat);
	456	}
	457
	458	if (ax25->sk != NULL) {
	459	bh_lock_sock(ax25->sk);
	460	sock_reset_flag(ax25->sk, SOCK_ZAPPED);
	461	bh_unlock_sock(ax25->sk);
	462	}
	463
	464	put:
	465	ax25_put_route(ax25_rt);
	466
	467	return 0;
	468	}
	469
	470	ax25_route ax25_rt_find_route(ax25_route route, ax25_address *addr,
	471	struct net_device *dev)
	472	{
	473	ax25_route *ax25_rt;
	474
	475	if ((ax25_rt = ax25_get_route(addr, dev)))
	476	return ax25_rt;
	477
	478	route->next = NULL;
	479	atomic_set(&route->ref, 1);
	480	route->callsign = *addr;
	481	route->dev = dev;
	482	route->digipeat = NULL;
	483	route->ip_mode = ' ';
	484
	485	return route;
	486	}
	487
	488	struct sk_buff ax25_rt_build_path(struct sk_buff skb, ax25_address *src,
	489	ax25_address dest, ax25_digi digi)
	490	{
	491	struct sk_buff *skbn;
	492	unsigned char *bp;
	493	int len;
	494
	495	len = digi->ndigi * AX25_ADDR_LEN;
	496
	497	if (skb_headroom(skb) < len) {
	498	if ((skbn = skb_realloc_headroom(skb, len)) == NULL) {
	499	printk(KERN_CRIT "AX.25: ax25_dg_build_path - out of memory\n");
	500	return NULL;
	501	}
	502
	503	if (skb->sk != NULL)
	504	skb_set_owner_w(skbn, skb->sk);
	505
	506	kfree_skb(skb);
	507
	508	skb = skbn;
	509	}
	510
	511	bp = skb_push(skb, len);
	512
513	ax25_addr_build(bp, src, dest, digi, AX25_COMMAND, AX25_MODULUS);
514
515	return skb;
516	}
517
518	/*
519	* Free all memory associated with routing structures.
520	*/
521	void __exit ax25_rt_free(void)
522	{
523	ax25_route s, ax25_rt = ax25_route_list;
524
525	write_lock(&ax25_route_lock);
526	while (ax25_rt != NULL) {
527	s = ax25_rt;
528	ax25_rt = ax25_rt->next;
529
a51482bd	530	kfree(s->digipeat);
1da177e4 LT	531	kfree(s);
	532	}
	533	write_unlock(&ax25_route_lock);
	534	}