kernel-ark/net/8021q/vlan_netlink.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

245 lines
5.8 KiB
C

/*
* VLAN netlink control interface
*
* Copyright (c) 2007 Patrick McHardy <kaber@trash.net>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* version 2 as published by the Free Software Foundation.
*/
#include <linux/kernel.h>
#include <linux/netdevice.h>
#include <linux/if_vlan.h>
#include <net/net_namespace.h>
#include <net/netlink.h>
#include <net/rtnetlink.h>
#include "vlan.h"
static const struct nla_policy vlan_policy[IFLA_VLAN_MAX + 1] = {
[IFLA_VLAN_ID] = { .type = NLA_U16 },
[IFLA_VLAN_FLAGS] = { .len = sizeof(struct ifla_vlan_flags) },
[IFLA_VLAN_EGRESS_QOS] = { .type = NLA_NESTED },
[IFLA_VLAN_INGRESS_QOS] = { .type = NLA_NESTED },
};
static const struct nla_policy vlan_map_policy[IFLA_VLAN_QOS_MAX + 1] = {
[IFLA_VLAN_QOS_MAPPING] = { .len = sizeof(struct ifla_vlan_qos_mapping) },
};
static inline int vlan_validate_qos_map(struct nlattr *attr)
{
if (!attr)
return 0;
return nla_validate_nested(attr, IFLA_VLAN_QOS_MAX, vlan_map_policy);
}
static int vlan_validate(struct nlattr *tb[], struct nlattr *data[])
{
struct ifla_vlan_flags *flags;
u16 id;
int err;
if (tb[IFLA_ADDRESS]) {
if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
return -EINVAL;
if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
return -EADDRNOTAVAIL;
}
if (!data)
return -EINVAL;
if (data[IFLA_VLAN_ID]) {
id = nla_get_u16(data[IFLA_VLAN_ID]);
if (id >= VLAN_VID_MASK)
return -ERANGE;
}
if (data[IFLA_VLAN_FLAGS]) {
flags = nla_data(data[IFLA_VLAN_FLAGS]);
if ((flags->flags & flags->mask) & ~VLAN_FLAG_REORDER_HDR)
return -EINVAL;
}
err = vlan_validate_qos_map(data[IFLA_VLAN_INGRESS_QOS]);
if (err < 0)
return err;
err = vlan_validate_qos_map(data[IFLA_VLAN_EGRESS_QOS]);
if (err < 0)
return err;
return 0;
}
static int vlan_changelink(struct net_device *dev,
struct nlattr *tb[], struct nlattr *data[])
{
struct vlan_dev_info *vlan = VLAN_DEV_INFO(dev);
struct ifla_vlan_flags *flags;
struct ifla_vlan_qos_mapping *m;
struct nlattr *attr;
int rem;
if (data[IFLA_VLAN_FLAGS]) {
flags = nla_data(data[IFLA_VLAN_FLAGS]);
vlan->flags = (vlan->flags & ~flags->mask) |
(flags->flags & flags->mask);
}
if (data[IFLA_VLAN_INGRESS_QOS]) {
nla_for_each_nested(attr, data[IFLA_VLAN_INGRESS_QOS], rem) {
m = nla_data(attr);
vlan_dev_set_ingress_priority(dev, m->to, m->from);
}
}
if (data[IFLA_VLAN_EGRESS_QOS]) {
nla_for_each_nested(attr, data[IFLA_VLAN_EGRESS_QOS], rem) {
m = nla_data(attr);
vlan_dev_set_egress_priority(dev, m->from, m->to);
}
}
return 0;
}
static int vlan_newlink(struct net_device *dev,
struct nlattr *tb[], struct nlattr *data[])
{
struct vlan_dev_info *vlan = VLAN_DEV_INFO(dev);
struct net_device *real_dev;
int err;
if (!data[IFLA_VLAN_ID])
return -EINVAL;
if (!tb[IFLA_LINK])
return -EINVAL;
real_dev = __dev_get_by_index(&init_net, nla_get_u32(tb[IFLA_LINK]));
if (!real_dev)
return -ENODEV;
vlan->vlan_id = nla_get_u16(data[IFLA_VLAN_ID]);
vlan->real_dev = real_dev;
vlan->flags = VLAN_FLAG_REORDER_HDR;
err = vlan_check_real_dev(real_dev, vlan->vlan_id);
if (err < 0)
return err;
if (!tb[IFLA_MTU])
dev->mtu = real_dev->mtu;
else if (dev->mtu > real_dev->mtu)
return -EINVAL;
err = vlan_changelink(dev, tb, data);
if (err < 0)
return err;
return register_vlan_dev(dev);
}
static void vlan_dellink(struct net_device *dev)
{
unregister_vlan_device(dev);
}
static inline size_t vlan_qos_map_size(unsigned int n)
{
if (n == 0)
return 0;
/* IFLA_VLAN_{EGRESS,INGRESS}_QOS + n * IFLA_VLAN_QOS_MAPPING */
return nla_total_size(sizeof(struct nlattr)) +
nla_total_size(sizeof(struct ifla_vlan_qos_mapping)) * n;
}
static size_t vlan_get_size(const struct net_device *dev)
{
struct vlan_dev_info *vlan = VLAN_DEV_INFO(dev);
return nla_total_size(2) + /* IFLA_VLAN_ID */
vlan_qos_map_size(vlan->nr_ingress_mappings) +
vlan_qos_map_size(vlan->nr_egress_mappings);
}
static int vlan_fill_info(struct sk_buff *skb, const struct net_device *dev)
{
struct vlan_dev_info *vlan = VLAN_DEV_INFO(dev);
struct vlan_priority_tci_mapping *pm;
struct ifla_vlan_flags f;
struct ifla_vlan_qos_mapping m;
struct nlattr *nest;
unsigned int i;
NLA_PUT_U16(skb, IFLA_VLAN_ID, VLAN_DEV_INFO(dev)->vlan_id);
if (vlan->flags) {
f.flags = vlan->flags;
f.mask = ~0;
NLA_PUT(skb, IFLA_VLAN_FLAGS, sizeof(f), &f);
}
if (vlan->nr_ingress_mappings) {
nest = nla_nest_start(skb, IFLA_VLAN_INGRESS_QOS);
if (nest == NULL)
goto nla_put_failure;
for (i = 0; i < ARRAY_SIZE(vlan->ingress_priority_map); i++) {
if (!vlan->ingress_priority_map[i])
continue;
m.from = i;
m.to = vlan->ingress_priority_map[i];
NLA_PUT(skb, IFLA_VLAN_QOS_MAPPING,
sizeof(m), &m);
}
nla_nest_end(skb, nest);
}
if (vlan->nr_egress_mappings) {
nest = nla_nest_start(skb, IFLA_VLAN_EGRESS_QOS);
if (nest == NULL)
goto nla_put_failure;
for (i = 0; i < ARRAY_SIZE(vlan->egress_priority_map); i++) {
for (pm = vlan->egress_priority_map[i]; pm;
pm = pm->next) {
if (!pm->vlan_qos)
continue;
m.from = pm->priority;
m.to = (pm->vlan_qos >> 13) & 0x7;
NLA_PUT(skb, IFLA_VLAN_QOS_MAPPING,
sizeof(m), &m);
}
}
nla_nest_end(skb, nest);
}
return 0;
nla_put_failure:
return -EMSGSIZE;
}
struct rtnl_link_ops vlan_link_ops __read_mostly = {
.kind = "vlan",
.maxtype = IFLA_VLAN_MAX,
.policy = vlan_policy,
.priv_size = sizeof(struct vlan_dev_info),
.setup = vlan_setup,
.validate = vlan_validate,
.newlink = vlan_newlink,
.changelink = vlan_changelink,
.dellink = vlan_dellink,
.get_size = vlan_get_size,
.fill_info = vlan_fill_info,
};
int __init vlan_netlink_init(void)
{
return rtnl_link_register(&vlan_link_ops);
}
void __exit vlan_netlink_fini(void)
{
rtnl_link_unregister(&vlan_link_ops);
}
MODULE_ALIAS_RTNL_LINK("vlan");