linux/net/x25/x25_route.c

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/*
* X.25 Packet Layer release 002
*
* This is ALPHA test software. This code may break your machine,
* randomly fail to work with new releases, misbehave and/or generally
* screw up. It might even work.
*
* This code REQUIRES 2.1.15 or higher
*
* 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
* X.25 001 Jonathan Naylor Started coding.
*/
#include <linux/if_arp.h>
#include <linux/init.h>
#include <net/x25.h>
struct list_head x25_route_list = LIST_HEAD_INIT(x25_route_list);
DEFINE_RWLOCK(x25_route_list_lock);
/*
* Add a new route.
*/
static int x25_add_route(struct x25_address *address, unsigned int sigdigits,
struct net_device *dev)
{
struct x25_route *rt;
struct list_head *entry;
int rc = -EINVAL;
write_lock_bh(&x25_route_list_lock);
list_for_each(entry, &x25_route_list) {
rt = list_entry(entry, struct x25_route, node);
if (!memcmp(&rt->address, address, sigdigits) &&
rt->sigdigits == sigdigits)
goto out;
}
rt = kmalloc(sizeof(*rt), GFP_ATOMIC);
rc = -ENOMEM;
if (!rt)
goto out;
strcpy(rt->address.x25_addr, "000000000000000");
memcpy(rt->address.x25_addr, address->x25_addr, sigdigits);
rt->sigdigits = sigdigits;
rt->dev = dev;
atomic_set(&rt->refcnt, 1);
list_add(&rt->node, &x25_route_list);
rc = 0;
out:
write_unlock_bh(&x25_route_list_lock);
return rc;
}
/**
* __x25_remove_route - remove route from x25_route_list
* @rt - route to remove
*
* Remove route from x25_route_list. If it was there.
* Caller must hold x25_route_list_lock.
*/
static void __x25_remove_route(struct x25_route *rt)
{
if (rt->node.next) {
list_del(&rt->node);
x25_route_put(rt);
}
}
static int x25_del_route(struct x25_address *address, unsigned int sigdigits,
struct net_device *dev)
{
struct x25_route *rt;
struct list_head *entry;
int rc = -EINVAL;
write_lock_bh(&x25_route_list_lock);
list_for_each(entry, &x25_route_list) {
rt = list_entry(entry, struct x25_route, node);
if (!memcmp(&rt->address, address, sigdigits) &&
rt->sigdigits == sigdigits && rt->dev == dev) {
__x25_remove_route(rt);
rc = 0;
break;
}
}
write_unlock_bh(&x25_route_list_lock);
return rc;
}
/*
* A device has been removed, remove its routes.
*/
void x25_route_device_down(struct net_device *dev)
{
struct x25_route *rt;
struct list_head *entry, *tmp;
write_lock_bh(&x25_route_list_lock);
list_for_each_safe(entry, tmp, &x25_route_list) {
rt = list_entry(entry, struct x25_route, node);
if (rt->dev == dev)
__x25_remove_route(rt);
}
write_unlock_bh(&x25_route_list_lock);
/* Remove any related forwarding */
x25_clear_forward_by_dev(dev);
}
/*
* Check that the device given is a valid X.25 interface that is "up".
*/
struct net_device *x25_dev_get(char *devname)
{
[NET]: Make the device list and device lookups per namespace. This patch makes most of the generic device layer network namespace safe. This patch makes dev_base_head a network namespace variable, and then it picks up a few associated variables. The functions: dev_getbyhwaddr dev_getfirsthwbytype dev_get_by_flags dev_get_by_name __dev_get_by_name dev_get_by_index __dev_get_by_index dev_ioctl dev_ethtool dev_load wireless_process_ioctl were modified to take a network namespace argument, and deal with it. vlan_ioctl_set and brioctl_set were modified so their hooks will receive a network namespace argument. So basically anthing in the core of the network stack that was affected to by the change of dev_base was modified to handle multiple network namespaces. The rest of the network stack was simply modified to explicitly use &init_net the initial network namespace. This can be fixed when those components of the network stack are modified to handle multiple network namespaces. For now the ifindex generator is left global. Fundametally ifindex numbers are per namespace, or else we will have corner case problems with migration when we get that far. At the same time there are assumptions in the network stack that the ifindex of a network device won't change. Making the ifindex number global seems a good compromise until the network stack can cope with ifindex changes when you change namespaces, and the like. Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2007-09-17 18:56:21 +00:00
struct net_device *dev = dev_get_by_name(&init_net, devname);
if (dev &&
(!(dev->flags & IFF_UP) || (dev->type != ARPHRD_X25
#if defined(CONFIG_LLC) || defined(CONFIG_LLC_MODULE)
&& dev->type != ARPHRD_ETHER
#endif
)))
dev_put(dev);
return dev;
}
/**
* x25_get_route - Find a route given an X.25 address.
* @addr - address to find a route for
*
* Find a route given an X.25 address.
*/
struct x25_route *x25_get_route(struct x25_address *addr)
{
struct x25_route *rt, *use = NULL;
struct list_head *entry;
read_lock_bh(&x25_route_list_lock);
list_for_each(entry, &x25_route_list) {
rt = list_entry(entry, struct x25_route, node);
if (!memcmp(&rt->address, addr, rt->sigdigits)) {
if (!use)
use = rt;
else if (rt->sigdigits > use->sigdigits)
use = rt;
}
}
if (use)
x25_route_hold(use);
read_unlock_bh(&x25_route_list_lock);
return use;
}
/*
* Handle the ioctls that control the routing functions.
*/
int x25_route_ioctl(unsigned int cmd, void __user *arg)
{
struct x25_route_struct rt;
struct net_device *dev;
int rc = -EINVAL;
if (cmd != SIOCADDRT && cmd != SIOCDELRT)
goto out;
rc = -EFAULT;
if (copy_from_user(&rt, arg, sizeof(rt)))
goto out;
rc = -EINVAL;
if (rt.sigdigits < 0 || rt.sigdigits > 15)
goto out;
dev = x25_dev_get(rt.device);
if (!dev)
goto out;
if (cmd == SIOCADDRT)
rc = x25_add_route(&rt.address, rt.sigdigits, dev);
else
rc = x25_del_route(&rt.address, rt.sigdigits, dev);
dev_put(dev);
out:
return rc;
}
/*
* Release all memory associated with X.25 routing structures.
*/
void __exit x25_route_free(void)
{
struct x25_route *rt;
struct list_head *entry, *tmp;
write_lock_bh(&x25_route_list_lock);
list_for_each_safe(entry, tmp, &x25_route_list) {
rt = list_entry(entry, struct x25_route, node);
__x25_remove_route(rt);
}
write_unlock_bh(&x25_route_list_lock);
}