/*
 *	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
 */

#define pr_fmt(fmt) "X25: " fmt

#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 shouldn't 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 shouldn't 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) {
			pr_warn("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);
}
40</option></select></td></tr><tr><td class='label'>space:</td><td class='ctrl'><select name='ignorews' onchange='this.form.submit();'><option value='0' selected='selected'>include</option><option value='1'>ignore</option></select></td></tr><tr><td class='label'>mode:</td><td class='ctrl'><select name='dt' onchange='this.form.submit();'><option value='0' selected='selected'>unified</option><option value='1'>ssdiff</option><option value='2'>stat only</option></select></td></tr><tr><td/><td class='ctrl'><noscript><input type='submit' value='reload'/></noscript></td></tr></table></form></div><table summary='commit info' class='commit-info'>
<tr><th>author</th><td>Linus Torvalds &lt;torvalds@linux-foundation.org&gt;</td><td class='right'>2017-01-30 13:18:12 -0800</td></tr>
<tr><th>committer</th><td>Linus Torvalds &lt;torvalds@linux-foundation.org&gt;</td><td class='right'>2017-01-30 13:18:12 -0800</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/tools/virtio/.gitignore?id=751321b3dd5040dc5be19bd23f985e80c914621a'>751321b3dd5040dc5be19bd23f985e80c914621a</a> (<a href='/cgit.cgi/linux/net-next.git/patch/tools/virtio/.gitignore?id=751321b3dd5040dc5be19bd23f985e80c914621a'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=751321b3dd5040dc5be19bd23f985e80c914621a'>967928e24b38dc7fed918f932bb1b243af42bf7f</a> /<a href='/cgit.cgi/linux/net-next.git/tree/tools/virtio/.gitignore?id=751321b3dd5040dc5be19bd23f985e80c914621a'>tools/virtio/.gitignore</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/tools/virtio/.gitignore?id=566cf877a1fcb6d6dc0126b076aad062054c2637'>566cf877a1fcb6d6dc0126b076aad062054c2637</a> (<a href='/cgit.cgi/linux/net-next.git/diff/tools/virtio/.gitignore?id=751321b3dd5040dc5be19bd23f985e80c914621a&amp;id2=566cf877a1fcb6d6dc0126b076aad062054c2637'>diff</a>)</td></tr><tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/tools/virtio/.gitignore?id=586655d278ba08af7b198b93217746f9a506ee8a'>586655d278ba08af7b198b93217746f9a506ee8a</a> (<a href='/cgit.cgi/linux/net-next.git/diff/tools/virtio/.gitignore?id=751321b3dd5040dc5be19bd23f985e80c914621a&amp;id2=586655d278ba08af7b198b93217746f9a506ee8a'>diff</a>)</td></tr></table>
<div class='commit-subject'>Merge tag 'rtc-4.10-2' of git://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linux</div><div class='commit-msg'>Pull RTC fix from Alexandre Belloni:
 "A single fix for this cycle. It is worth taking it for 4.10 so that
  distributions will not have CONFIG_RTC_DRV_JZ4740 switching from m to
  y in their config.

  Summary:
   - Allow jz4740 to build as a module again by using kernel_halt()"

* tag 'rtc-4.10-2' of git://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linux:
  rtc: jz4740: make the driver buildable as a module again
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=751321b3dd5040dc5be19bd23f985e80c914621a'>Diffstat</a> (limited to 'tools/virtio/.gitignore')</div><table summary='diffstat' class='diffstat'>