android_kernel_xiaomi_sm8350/net/x25/x25_route.c
Eric W. Biederman 881d966b48 [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>
2007-10-10 16:49:10 -07:00

224 lines
4.8 KiB
C

/*
* 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)
{
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);
}