linux/net/8021q/vlan.c
Pavel Emelyanov cd1c701432 [VLAN]: Add a net argument to proc init and cleanup calls.
All proc files will be created in each net, so prepare them for 
this change now, not to mess it with real creation patch.

The net != &init_net checks in them are for git-bisect sanity, 
but I will drop them soon.

Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Acked-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
2008-04-16 00:51:12 -07:00

729 lines
17 KiB
C

/*
* INET 802.1Q VLAN
* Ethernet-type device handling.
*
* Authors: Ben Greear <greearb@candelatech.com>
* Please send support related email to: netdev@vger.kernel.org
* VLAN Home Page: http://www.candelatech.com/~greear/vlan.html
*
* Fixes:
* Fix for packet capture - Nick Eggleston <nick@dccinc.com>;
* Add HW acceleration hooks - David S. Miller <davem@redhat.com>;
* Correct all the locking - David S. Miller <davem@redhat.com>;
* Use hash table for VLAN groups - David S. Miller <davem@redhat.com>
*
* This program 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.
*/
#include <asm/uaccess.h> /* for copy_from_user */
#include <linux/capability.h>
#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/skbuff.h>
#include <net/datalink.h>
#include <linux/mm.h>
#include <linux/in.h>
#include <linux/init.h>
#include <net/p8022.h>
#include <net/arp.h>
#include <linux/rtnetlink.h>
#include <linux/notifier.h>
#include <net/net_namespace.h>
#include <net/netns/generic.h>
#include <linux/if_vlan.h>
#include "vlan.h"
#include "vlanproc.h"
#define DRV_VERSION "1.8"
/* Global VLAN variables */
int vlan_net_id;
/* Our listing of VLAN group(s) */
static struct hlist_head vlan_group_hash[VLAN_GRP_HASH_SIZE];
static char vlan_fullname[] = "802.1Q VLAN Support";
static char vlan_version[] = DRV_VERSION;
static char vlan_copyright[] = "Ben Greear <greearb@candelatech.com>";
static char vlan_buggyright[] = "David S. Miller <davem@redhat.com>";
/* Determines interface naming scheme. */
unsigned short vlan_name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD;
static struct packet_type vlan_packet_type = {
.type = __constant_htons(ETH_P_8021Q),
.func = vlan_skb_recv, /* VLAN receive method */
};
/* End of global variables definitions. */
static inline unsigned int vlan_grp_hashfn(unsigned int idx)
{
return ((idx >> VLAN_GRP_HASH_SHIFT) ^ idx) & VLAN_GRP_HASH_MASK;
}
/* Must be invoked with RCU read lock (no preempt) */
static struct vlan_group *__vlan_find_group(struct net_device *real_dev)
{
struct vlan_group *grp;
struct hlist_node *n;
int hash = vlan_grp_hashfn(real_dev->ifindex);
hlist_for_each_entry_rcu(grp, n, &vlan_group_hash[hash], hlist) {
if (grp->real_dev == real_dev)
return grp;
}
return NULL;
}
/* Find the protocol handler. Assumes VID < VLAN_VID_MASK.
*
* Must be invoked with RCU read lock (no preempt)
*/
struct net_device *__find_vlan_dev(struct net_device *real_dev,
unsigned short VID)
{
struct vlan_group *grp = __vlan_find_group(real_dev);
if (grp)
return vlan_group_get_device(grp, VID);
return NULL;
}
static void vlan_group_free(struct vlan_group *grp)
{
int i;
for (i = 0; i < VLAN_GROUP_ARRAY_SPLIT_PARTS; i++)
kfree(grp->vlan_devices_arrays[i]);
kfree(grp);
}
static struct vlan_group *vlan_group_alloc(struct net_device *real_dev)
{
struct vlan_group *grp;
grp = kzalloc(sizeof(struct vlan_group), GFP_KERNEL);
if (!grp)
return NULL;
grp->real_dev = real_dev;
hlist_add_head_rcu(&grp->hlist,
&vlan_group_hash[vlan_grp_hashfn(real_dev->ifindex)]);
return grp;
}
static int vlan_group_prealloc_vid(struct vlan_group *vg, int vid)
{
struct net_device **array;
unsigned int size;
ASSERT_RTNL();
array = vg->vlan_devices_arrays[vid / VLAN_GROUP_ARRAY_PART_LEN];
if (array != NULL)
return 0;
size = sizeof(struct net_device *) * VLAN_GROUP_ARRAY_PART_LEN;
array = kzalloc(size, GFP_KERNEL);
if (array == NULL)
return -ENOBUFS;
vg->vlan_devices_arrays[vid / VLAN_GROUP_ARRAY_PART_LEN] = array;
return 0;
}
static void vlan_rcu_free(struct rcu_head *rcu)
{
vlan_group_free(container_of(rcu, struct vlan_group, rcu));
}
void unregister_vlan_dev(struct net_device *dev)
{
struct vlan_dev_info *vlan = vlan_dev_info(dev);
struct net_device *real_dev = vlan->real_dev;
struct vlan_group *grp;
unsigned short vlan_id = vlan->vlan_id;
ASSERT_RTNL();
grp = __vlan_find_group(real_dev);
BUG_ON(!grp);
vlan_proc_rem_dev(dev);
/* Take it out of our own structures, but be sure to interlock with
* HW accelerating devices or SW vlan input packet processing.
*/
if (real_dev->features & NETIF_F_HW_VLAN_FILTER)
real_dev->vlan_rx_kill_vid(real_dev, vlan_id);
vlan_group_set_device(grp, vlan_id, NULL);
grp->nr_vlans--;
synchronize_net();
/* If the group is now empty, kill off the group. */
if (grp->nr_vlans == 0) {
if (real_dev->features & NETIF_F_HW_VLAN_RX)
real_dev->vlan_rx_register(real_dev, NULL);
hlist_del_rcu(&grp->hlist);
/* Free the group, after all cpu's are done. */
call_rcu(&grp->rcu, vlan_rcu_free);
}
/* Get rid of the vlan's reference to real_dev */
dev_put(real_dev);
unregister_netdevice(dev);
}
static void vlan_transfer_operstate(const struct net_device *dev,
struct net_device *vlandev)
{
/* Have to respect userspace enforced dormant state
* of real device, also must allow supplicant running
* on VLAN device
*/
if (dev->operstate == IF_OPER_DORMANT)
netif_dormant_on(vlandev);
else
netif_dormant_off(vlandev);
if (netif_carrier_ok(dev)) {
if (!netif_carrier_ok(vlandev))
netif_carrier_on(vlandev);
} else {
if (netif_carrier_ok(vlandev))
netif_carrier_off(vlandev);
}
}
int vlan_check_real_dev(struct net_device *real_dev, unsigned short vlan_id)
{
char *name = real_dev->name;
if (real_dev->features & NETIF_F_VLAN_CHALLENGED) {
pr_info("8021q: VLANs not supported on %s\n", name);
return -EOPNOTSUPP;
}
if ((real_dev->features & NETIF_F_HW_VLAN_RX) &&
!real_dev->vlan_rx_register) {
pr_info("8021q: device %s has buggy VLAN hw accel\n", name);
return -EOPNOTSUPP;
}
if ((real_dev->features & NETIF_F_HW_VLAN_FILTER) &&
(!real_dev->vlan_rx_add_vid || !real_dev->vlan_rx_kill_vid)) {
pr_info("8021q: Device %s has buggy VLAN hw accel\n", name);
return -EOPNOTSUPP;
}
/* The real device must be up and operating in order to
* assosciate a VLAN device with it.
*/
if (!(real_dev->flags & IFF_UP))
return -ENETDOWN;
if (__find_vlan_dev(real_dev, vlan_id) != NULL)
return -EEXIST;
return 0;
}
int register_vlan_dev(struct net_device *dev)
{
struct vlan_dev_info *vlan = vlan_dev_info(dev);
struct net_device *real_dev = vlan->real_dev;
unsigned short vlan_id = vlan->vlan_id;
struct vlan_group *grp, *ngrp = NULL;
int err;
grp = __vlan_find_group(real_dev);
if (!grp) {
ngrp = grp = vlan_group_alloc(real_dev);
if (!grp)
return -ENOBUFS;
}
err = vlan_group_prealloc_vid(grp, vlan_id);
if (err < 0)
goto out_free_group;
err = register_netdevice(dev);
if (err < 0)
goto out_free_group;
/* Account for reference in struct vlan_dev_info */
dev_hold(real_dev);
vlan_transfer_operstate(real_dev, dev);
linkwatch_fire_event(dev); /* _MUST_ call rfc2863_policy() */
/* So, got the sucker initialized, now lets place
* it into our local structure.
*/
vlan_group_set_device(grp, vlan_id, dev);
grp->nr_vlans++;
if (ngrp && real_dev->features & NETIF_F_HW_VLAN_RX)
real_dev->vlan_rx_register(real_dev, ngrp);
if (real_dev->features & NETIF_F_HW_VLAN_FILTER)
real_dev->vlan_rx_add_vid(real_dev, vlan_id);
if (vlan_proc_add_dev(dev) < 0)
pr_warning("8021q: failed to add proc entry for %s\n",
dev->name);
return 0;
out_free_group:
if (ngrp)
vlan_group_free(ngrp);
return err;
}
/* Attach a VLAN device to a mac address (ie Ethernet Card).
* Returns 0 if the device was created or a negative error code otherwise.
*/
static int register_vlan_device(struct net_device *real_dev,
unsigned short VLAN_ID)
{
struct net_device *new_dev;
char name[IFNAMSIZ];
int err;
if (VLAN_ID >= VLAN_VID_MASK)
return -ERANGE;
err = vlan_check_real_dev(real_dev, VLAN_ID);
if (err < 0)
return err;
/* Gotta set up the fields for the device. */
switch (vlan_name_type) {
case VLAN_NAME_TYPE_RAW_PLUS_VID:
/* name will look like: eth1.0005 */
snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, VLAN_ID);
break;
case VLAN_NAME_TYPE_PLUS_VID_NO_PAD:
/* Put our vlan.VID in the name.
* Name will look like: vlan5
*/
snprintf(name, IFNAMSIZ, "vlan%i", VLAN_ID);
break;
case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD:
/* Put our vlan.VID in the name.
* Name will look like: eth0.5
*/
snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, VLAN_ID);
break;
case VLAN_NAME_TYPE_PLUS_VID:
/* Put our vlan.VID in the name.
* Name will look like: vlan0005
*/
default:
snprintf(name, IFNAMSIZ, "vlan%.4i", VLAN_ID);
}
new_dev = alloc_netdev(sizeof(struct vlan_dev_info), name,
vlan_setup);
if (new_dev == NULL)
return -ENOBUFS;
/* need 4 bytes for extra VLAN header info,
* hope the underlying device can handle it.
*/
new_dev->mtu = real_dev->mtu;
vlan_dev_info(new_dev)->vlan_id = VLAN_ID; /* 1 through VLAN_VID_MASK */
vlan_dev_info(new_dev)->real_dev = real_dev;
vlan_dev_info(new_dev)->dent = NULL;
vlan_dev_info(new_dev)->flags = VLAN_FLAG_REORDER_HDR;
new_dev->rtnl_link_ops = &vlan_link_ops;
err = register_vlan_dev(new_dev);
if (err < 0)
goto out_free_newdev;
return 0;
out_free_newdev:
free_netdev(new_dev);
return err;
}
static void vlan_sync_address(struct net_device *dev,
struct net_device *vlandev)
{
struct vlan_dev_info *vlan = vlan_dev_info(vlandev);
/* May be called without an actual change */
if (!compare_ether_addr(vlan->real_dev_addr, dev->dev_addr))
return;
/* vlan address was different from the old address and is equal to
* the new address */
if (compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
!compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
dev_unicast_delete(dev, vlandev->dev_addr, ETH_ALEN);
/* vlan address was equal to the old address and is different from
* the new address */
if (!compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
dev_unicast_add(dev, vlandev->dev_addr, ETH_ALEN);
memcpy(vlan->real_dev_addr, dev->dev_addr, ETH_ALEN);
}
static void __vlan_device_event(struct net_device *dev, unsigned long event)
{
switch (event) {
case NETDEV_CHANGENAME:
vlan_proc_rem_dev(dev);
if (vlan_proc_add_dev(dev) < 0)
pr_warning("8021q: failed to change proc name for %s\n",
dev->name);
break;
}
}
static int vlan_device_event(struct notifier_block *unused, unsigned long event,
void *ptr)
{
struct net_device *dev = ptr;
struct vlan_group *grp;
int i, flgs;
struct net_device *vlandev;
if (dev_net(dev) != &init_net)
return NOTIFY_DONE;
if (is_vlan_dev(dev)) {
__vlan_device_event(dev, event);
goto out;
}
grp = __vlan_find_group(dev);
if (!grp)
goto out;
/* It is OK that we do not hold the group lock right now,
* as we run under the RTNL lock.
*/
switch (event) {
case NETDEV_CHANGE:
/* Propagate real device state to vlan devices */
for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
vlandev = vlan_group_get_device(grp, i);
if (!vlandev)
continue;
vlan_transfer_operstate(dev, vlandev);
}
break;
case NETDEV_CHANGEADDR:
/* Adjust unicast filters on underlying device */
for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
vlandev = vlan_group_get_device(grp, i);
if (!vlandev)
continue;
flgs = vlandev->flags;
if (!(flgs & IFF_UP))
continue;
vlan_sync_address(dev, vlandev);
}
break;
case NETDEV_DOWN:
/* Put all VLANs for this dev in the down state too. */
for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
vlandev = vlan_group_get_device(grp, i);
if (!vlandev)
continue;
flgs = vlandev->flags;
if (!(flgs & IFF_UP))
continue;
dev_change_flags(vlandev, flgs & ~IFF_UP);
}
break;
case NETDEV_UP:
/* Put all VLANs for this dev in the up state too. */
for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
vlandev = vlan_group_get_device(grp, i);
if (!vlandev)
continue;
flgs = vlandev->flags;
if (flgs & IFF_UP)
continue;
dev_change_flags(vlandev, flgs | IFF_UP);
}
break;
case NETDEV_UNREGISTER:
/* Delete all VLANs for this dev. */
for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
vlandev = vlan_group_get_device(grp, i);
if (!vlandev)
continue;
/* unregistration of last vlan destroys group, abort
* afterwards */
if (grp->nr_vlans == 1)
i = VLAN_GROUP_ARRAY_LEN;
unregister_vlan_dev(vlandev);
}
break;
}
out:
return NOTIFY_DONE;
}
static struct notifier_block vlan_notifier_block __read_mostly = {
.notifier_call = vlan_device_event,
};
/*
* VLAN IOCTL handler.
* o execute requested action or pass command to the device driver
* arg is really a struct vlan_ioctl_args __user *.
*/
static int vlan_ioctl_handler(struct net *net, void __user *arg)
{
int err;
unsigned short vid = 0;
struct vlan_ioctl_args args;
struct net_device *dev = NULL;
if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args)))
return -EFAULT;
/* Null terminate this sucker, just in case. */
args.device1[23] = 0;
args.u.device2[23] = 0;
rtnl_lock();
switch (args.cmd) {
case SET_VLAN_INGRESS_PRIORITY_CMD:
case SET_VLAN_EGRESS_PRIORITY_CMD:
case SET_VLAN_FLAG_CMD:
case ADD_VLAN_CMD:
case DEL_VLAN_CMD:
case GET_VLAN_REALDEV_NAME_CMD:
case GET_VLAN_VID_CMD:
err = -ENODEV;
dev = __dev_get_by_name(&init_net, args.device1);
if (!dev)
goto out;
err = -EINVAL;
if (args.cmd != ADD_VLAN_CMD &&
!(dev->priv_flags & IFF_802_1Q_VLAN))
goto out;
}
switch (args.cmd) {
case SET_VLAN_INGRESS_PRIORITY_CMD:
err = -EPERM;
if (!capable(CAP_NET_ADMIN))
break;
vlan_dev_set_ingress_priority(dev,
args.u.skb_priority,
args.vlan_qos);
err = 0;
break;
case SET_VLAN_EGRESS_PRIORITY_CMD:
err = -EPERM;
if (!capable(CAP_NET_ADMIN))
break;
err = vlan_dev_set_egress_priority(dev,
args.u.skb_priority,
args.vlan_qos);
break;
case SET_VLAN_FLAG_CMD:
err = -EPERM;
if (!capable(CAP_NET_ADMIN))
break;
err = vlan_dev_set_vlan_flag(dev,
args.u.flag,
args.vlan_qos);
break;
case SET_VLAN_NAME_TYPE_CMD:
err = -EPERM;
if (!capable(CAP_NET_ADMIN))
break;
if ((args.u.name_type >= 0) &&
(args.u.name_type < VLAN_NAME_TYPE_HIGHEST)) {
vlan_name_type = args.u.name_type;
err = 0;
} else {
err = -EINVAL;
}
break;
case ADD_VLAN_CMD:
err = -EPERM;
if (!capable(CAP_NET_ADMIN))
break;
err = register_vlan_device(dev, args.u.VID);
break;
case DEL_VLAN_CMD:
err = -EPERM;
if (!capable(CAP_NET_ADMIN))
break;
unregister_vlan_dev(dev);
err = 0;
break;
case GET_VLAN_REALDEV_NAME_CMD:
err = 0;
vlan_dev_get_realdev_name(dev, args.u.device2);
if (copy_to_user(arg, &args,
sizeof(struct vlan_ioctl_args)))
err = -EFAULT;
break;
case GET_VLAN_VID_CMD:
err = 0;
vlan_dev_get_vid(dev, &vid);
args.u.VID = vid;
if (copy_to_user(arg, &args,
sizeof(struct vlan_ioctl_args)))
err = -EFAULT;
break;
default:
err = -EOPNOTSUPP;
break;
}
out:
rtnl_unlock();
return err;
}
static int vlan_init_net(struct net *net)
{
int err;
struct vlan_net *vn;
err = -ENOMEM;
vn = kzalloc(sizeof(struct vlan_net), GFP_KERNEL);
if (vn == NULL)
goto err_alloc;
err = net_assign_generic(net, vlan_net_id, vn);
if (err < 0)
goto err_assign;
err = vlan_proc_init(net);
if (err < 0)
goto err_proc;
return 0;
err_proc:
/* nothing */
err_assign:
kfree(vn);
err_alloc:
return err;
}
static void vlan_exit_net(struct net *net)
{
struct vlan_net *vn;
vn = net_generic(net, vlan_net_id);
vlan_proc_cleanup(net);
kfree(vn);
}
static struct pernet_operations vlan_net_ops = {
.init = vlan_init_net,
.exit = vlan_exit_net,
};
static int __init vlan_proto_init(void)
{
int err;
pr_info("%s v%s %s\n", vlan_fullname, vlan_version, vlan_copyright);
pr_info("All bugs added by %s\n", vlan_buggyright);
err = register_pernet_gen_device(&vlan_net_id, &vlan_net_ops);
if (err < 0)
goto err0;
err = register_netdevice_notifier(&vlan_notifier_block);
if (err < 0)
goto err2;
err = vlan_netlink_init();
if (err < 0)
goto err3;
dev_add_pack(&vlan_packet_type);
vlan_ioctl_set(vlan_ioctl_handler);
return 0;
err3:
unregister_netdevice_notifier(&vlan_notifier_block);
err2:
unregister_pernet_gen_device(vlan_net_id, &vlan_net_ops);
err0:
return err;
}
static void __exit vlan_cleanup_module(void)
{
unsigned int i;
vlan_ioctl_set(NULL);
vlan_netlink_fini();
unregister_netdevice_notifier(&vlan_notifier_block);
dev_remove_pack(&vlan_packet_type);
/* This table must be empty if there are no module references left. */
for (i = 0; i < VLAN_GRP_HASH_SIZE; i++)
BUG_ON(!hlist_empty(&vlan_group_hash[i]));
unregister_pernet_gen_device(vlan_net_id, &vlan_net_ops);
synchronize_net();
}
module_init(vlan_proto_init);
module_exit(vlan_cleanup_module);
MODULE_LICENSE("GPL");
MODULE_VERSION(DRV_VERSION);