[GitHub/mt8127/android_kernel_alcatel_ttab.git] / net / x25 / x25_forward.c

/*
 *	This module:
 *		This module 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.
 *
 *	History
 *	03-01-2007	Added forwarding for x.25	Andrew Hendry
 */
#include <linux/if_arp.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <net/x25.h>

LIST_HEAD(x25_forward_list);
DEFINE_RWLOCK(x25_forward_list_lock);

int x25_forward_call(struct x25_address *dest_addr, struct x25_neigh *from,
			struct sk_buff *skb, int lci)
{
	struct x25_route *rt;
	struct x25_neigh *neigh_new = NULL;
	struct list_head *entry;
	struct x25_forward *x25_frwd, *new_frwd;
	struct sk_buff *skbn;
	short same_lci = 0;
	int rc = 0;

	if ((rt = x25_get_route(dest_addr)) == NULL)
		goto out_no_route;

	if ((neigh_new = x25_get_neigh(rt->dev)) == NULL) {
		/* This shouldnt happen, if it occurs somehow
		 * do something sensible
		 */
		goto out_put_route;
	}

	/* Avoid a loop. This is the normal exit path for a
	 * system with only one x.25 iface and default route
	 */
	if (rt->dev == from->dev) {
		goto out_put_nb;
	}

	/* Remote end sending a call request on an already
	 * established LCI? It shouldnt happen, just in case..
	 */
	read_lock_bh(&x25_forward_list_lock);
	list_for_each(entry, &x25_forward_list) {
		x25_frwd = list_entry(entry, struct x25_forward, node);
		if (x25_frwd->lci == lci) {
			printk(KERN_WARNING "X.25: call request for lci which is already registered!, transmitting but not registering new pair\n");
			same_lci = 1;
		}
	}
	read_unlock_bh(&x25_forward_list_lock);

	/* Save the forwarding details for future traffic */
	if (!same_lci){
		if ((new_frwd = kmalloc(sizeof(struct x25_forward),
						GFP_ATOMIC)) == NULL){
			rc = -ENOMEM;
			goto out_put_nb;
		}
		new_frwd->lci = lci;
		new_frwd->dev1 = rt->dev;
		new_frwd->dev2 = from->dev;
		write_lock_bh(&x25_forward_list_lock);
		list_add(&new_frwd->node, &x25_forward_list);
		write_unlock_bh(&x25_forward_list_lock);
	}

	/* Forward the call request */
	if ( (skbn = skb_clone(skb, GFP_ATOMIC)) == NULL){
		goto out_put_nb;
	}
	x25_transmit_link(skbn, neigh_new);
	rc = 1;


out_put_nb:
	x25_neigh_put(neigh_new);

out_put_route:
	x25_route_put(rt);

out_no_route:
	return rc;
}


int x25_forward_data(int lci, struct x25_neigh *from, struct sk_buff *skb) {

	struct x25_forward *frwd;
	struct list_head *entry;
	struct net_device *peer = NULL;
	struct x25_neigh *nb;
	struct sk_buff *skbn;
	int rc = 0;

	read_lock_bh(&x25_forward_list_lock);
	list_for_each(entry, &x25_forward_list) {
		frwd = list_entry(entry, struct x25_forward, node);
		if (frwd->lci == lci) {
			/* The call is established, either side can send */
			if (from->dev == frwd->dev1) {
				peer = frwd->dev2;
			} else {
				peer = frwd->dev1;
			}
			break;
		}
	}
	read_unlock_bh(&x25_forward_list_lock);

	if ( (nb = x25_get_neigh(peer)) == NULL)
		goto out;

	if ( (skbn = pskb_copy(skb, GFP_ATOMIC)) == NULL){
		goto output;

	}
	x25_transmit_link(skbn, nb);

	rc = 1;
output:
	x25_neigh_put(nb);
out:
	return rc;
}

void x25_clear_forward_by_lci(unsigned int lci)
{
	struct x25_forward *fwd;
	struct list_head *entry, *tmp;

	write_lock_bh(&x25_forward_list_lock);

	list_for_each_safe(entry, tmp, &x25_forward_list) {
		fwd = list_entry(entry, struct x25_forward, node);
		if (fwd->lci == lci) {
			list_del(&fwd->node);
			kfree(fwd);
		}
	}
	write_unlock_bh(&x25_forward_list_lock);
}


void x25_clear_forward_by_dev(struct net_device *dev)
{
	struct x25_forward *fwd;
	struct list_head *entry, *tmp;

	write_lock_bh(&x25_forward_list_lock);

	list_for_each_safe(entry, tmp, &x25_forward_list) {
		fwd = list_entry(entry, struct x25_forward, node);
		if ((fwd->dev1 == dev) || (fwd->dev2 == dev)){
			list_del(&fwd->node);
			kfree(fwd);
		}
	}
	write_unlock_bh(&x25_forward_list_lock);
}
Commit	Line	Data
95a9dc43 AH	1	/*
	2	* This module:
	3	* This module is free software; you can redistribute it and/or
	4	* modify it under the terms of the GNU General Public License
	5	* as published by the Free Software Foundation; either version
	6	* 2 of the License, or (at your option) any later version.
	7	*
	8	* History
	9	* 03-01-2007 Added forwarding for x.25 Andrew Hendry
	10	*/
	11	#include <linux/if_arp.h>
	12	#include <linux/init.h>
5a0e3ad6	13	#include <linux/slab.h>
95a9dc43 AH	14	#include <net/x25.h>
95a9dc43 AH	15
0e3cf7e9	16	LIST_HEAD(x25_forward_list);
95a9dc43 AH	17	DEFINE_RWLOCK(x25_forward_list_lock);
	18
	19	int x25_forward_call(struct x25_address dest_addr, struct x25_neigh from,
	20	struct sk_buff *skb, int lci)
	21	{
	22	struct x25_route *rt;
	23	struct x25_neigh *neigh_new = NULL;
	24	struct list_head *entry;
	25	struct x25_forward x25_frwd, new_frwd;
	26	struct sk_buff *skbn;
	27	short same_lci = 0;
	28	int rc = 0;
	29
e4ce837d AB	30	if ((rt = x25_get_route(dest_addr)) == NULL)
e4ce837d AB	31	goto out_no_route;
95a9dc43	32
e4ce837d AB	33	if ((neigh_new = x25_get_neigh(rt->dev)) == NULL) {
	34	/* This shouldnt happen, if it occurs somehow
	35	* do something sensible
95a9dc43	36	*/
e4ce837d AB	37	goto out_put_route;
e4ce837d AB	38	}
95a9dc43	39
e4ce837d AB	40	/* Avoid a loop. This is the normal exit path for a
	41	* system with only one x.25 iface and default route
	42	*/
	43	if (rt->dev == from->dev) {
	44	goto out_put_nb;
	45	}
	46
	47	/* Remote end sending a call request on an already
	48	* established LCI? It shouldnt happen, just in case..
	49	*/
	50	read_lock_bh(&x25_forward_list_lock);
	51	list_for_each(entry, &x25_forward_list) {
	52	x25_frwd = list_entry(entry, struct x25_forward, node);
	53	if (x25_frwd->lci == lci) {
	54	printk(KERN_WARNING "X.25: call request for lci which is already registered!, transmitting but not registering new pair\n");
	55	same_lci = 1;
95a9dc43	56	}
e4ce837d AB	57	}
e4ce837d AB	58	read_unlock_bh(&x25_forward_list_lock);
95a9dc43	59
e4ce837d AB	60	/* Save the forwarding details for future traffic */
	61	if (!same_lci){
	62	if ((new_frwd = kmalloc(sizeof(struct x25_forward),
	63	GFP_ATOMIC)) == NULL){
	64	rc = -ENOMEM;
95a9dc43 AH	65	goto out_put_nb;
95a9dc43 AH	66	}
e4ce837d AB	67	new_frwd->lci = lci;
	68	new_frwd->dev1 = rt->dev;
	69	new_frwd->dev2 = from->dev;
	70	write_lock_bh(&x25_forward_list_lock);
	71	list_add(&new_frwd->node, &x25_forward_list);
	72	write_unlock_bh(&x25_forward_list_lock);
	73	}
	74
	75	/* Forward the call request */
	76	if ( (skbn = skb_clone(skb, GFP_ATOMIC)) == NULL){
	77	goto out_put_nb;
95a9dc43	78	}
e4ce837d AB	79	x25_transmit_link(skbn, neigh_new);
e4ce837d AB	80	rc = 1;
95a9dc43 AH	81
	82
	83	out_put_nb:
	84	x25_neigh_put(neigh_new);
	85
	86	out_put_route:
	87	x25_route_put(rt);
e4ce837d AB	88
e4ce837d AB	89	out_no_route:
95a9dc43 AH	90	return rc;
	91	}
	92
	93
	94	int x25_forward_data(int lci, struct x25_neigh from, struct sk_buff skb) {
	95
	96	struct x25_forward *frwd;
	97	struct list_head *entry;
	98	struct net_device *peer = NULL;
	99	struct x25_neigh *nb;
	100	struct sk_buff *skbn;
	101	int rc = 0;
	102
	103	read_lock_bh(&x25_forward_list_lock);
	104	list_for_each(entry, &x25_forward_list) {
	105	frwd = list_entry(entry, struct x25_forward, node);
	106	if (frwd->lci == lci) {
	107	/* The call is established, either side can send */
	108	if (from->dev == frwd->dev1) {
	109	peer = frwd->dev2;
	110	} else {
	111	peer = frwd->dev1;
	112	}
	113	break;
	114	}
	115	}
	116	read_unlock_bh(&x25_forward_list_lock);
	117
	118	if ( (nb = x25_get_neigh(peer)) == NULL)
	119	goto out;
	120
	121	if ( (skbn = pskb_copy(skb, GFP_ATOMIC)) == NULL){
76975f8a	122	goto output;
95a9dc43 AH	123
	124	}
	125	x25_transmit_link(skbn, nb);
	126
95a9dc43	127	rc = 1;
76975f8a JL	128	output:
76975f8a JL	129	x25_neigh_put(nb);
95a9dc43 AH	130	out:
	131	return rc;
	132	}
	133
	134	void x25_clear_forward_by_lci(unsigned int lci)
	135	{
	136	struct x25_forward *fwd;
	137	struct list_head entry, tmp;
	138
	139	write_lock_bh(&x25_forward_list_lock);
	140
	141	list_for_each_safe(entry, tmp, &x25_forward_list) {
	142	fwd = list_entry(entry, struct x25_forward, node);
	143	if (fwd->lci == lci) {
	144	list_del(&fwd->node);
	145	kfree(fwd);
	146	}
	147	}
	148	write_unlock_bh(&x25_forward_list_lock);
	149	}
	150
	151
	152	void x25_clear_forward_by_dev(struct net_device *dev)
	153	{
	154	struct x25_forward *fwd;
	155	struct list_head entry, tmp;
	156
	157	write_lock_bh(&x25_forward_list_lock);
	158
	159	list_for_each_safe(entry, tmp, &x25_forward_list) {
	160	fwd = list_entry(entry, struct x25_forward, node);
	161	if ((fwd->dev1 == dev) \|\| (fwd->dev2 == dev)){
	162	list_del(&fwd->node);
	163	kfree(fwd);
	164	}
	165	}
	166	write_unlock_bh(&x25_forward_list_lock);
	167	}