/*
802.1Q VLAN Ethernet-type device handling.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/capability.h>
#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/skbuff.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/rculist.h>
#include <net/p8022.h>
#include <net/arp.h>
#include <linux/rtnetlink.h>
#include <linux/notifier.h>
#include <net/rtnetlink.h>
#include <net/net_namespace.h>
#include <net/netns/generic.h>
#include <asm/uaccess.h>
#include <linux/if_vlan.h>
#include "vlan.h"
#include "vlanproc.h"
#define DRV_VERSION "1.8"
/* Global VLAN variables */
int vlan_net_id __read_mostly;
const char vlan_fullname[] = "802.1Q VLAN Support";
const char vlan_version[] = DRV_VERSION;
/* End of global variables definitions. */
static int vlan_group_prealloc_vid(struct vlan_group *vg,
__be16 vlan_proto, u16 vlan_id)
{
struct net_device **array;
unsigned int pidx, vidx;
unsigned int size;
ASSERT_RTNL();
pidx = vlan_proto_idx(vlan_proto);
vidx = vlan_id / VLAN_GROUP_ARRAY_PART_LEN;
array = vg->vlan_devices_arrays[pidx][vidx];
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[pidx][vidx] = array;
return 0;
}
void unregister_vlan_dev(struct net_device *dev, struct list_head *head)
{
struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
struct net_device *real_dev = vlan->real_dev;
struct vlan_info *vlan_info;
struct vlan_group *grp;
u16 vlan_id = vlan->vlan_id;
ASSERT_RTNL();
vlan_info = rtnl_dereference(real_dev->vlan_info);
BUG_ON(!vlan_info);
grp = &vlan_info->grp;
grp->nr_vlan_devs--;
if (vlan->flags & VLAN_FLAG_MVRP)
vlan_mvrp_request_leave(dev);
if (vlan->flags & VLAN_FLAG_GVRP)
vlan_gvrp_request_leave(dev);
vlan_group_set_device(grp, vlan->vlan_proto, vlan_id, NULL);
netdev_upper_dev_unlink(real_dev, dev);
/* Because unregister_netdevice_queue() makes sure at least one rcu
* grace period is respected before device freeing,
* we dont need to call synchronize_net() here.
*/
unregister_netdevice_queue(dev, head);
if (grp->nr_vlan_devs == 0) {
vlan_mvrp_uninit_applicant(real_dev);
vlan_gvrp_uninit_applicant(real_dev);
}
/* Take it out of our own structures, but be sure to interlock with
* HW accelerating devices or SW vlan input packet processing if
* VLAN is not 0 (leave it there for 802.1p).
*/
if (vlan_id)
vlan_vid_del(real_dev, vlan->vlan_proto, vlan_id);
/* Get rid of the vlan's reference to real_dev */
dev_put(real_dev);
}
int vlan_check_real_dev(struct net_device *real_dev,
__be16 protocol, u16 vlan_id)
{
const char *name = real_dev->name;
if (real_dev->features & NETIF_F_VLAN_CHALLENGED) {
pr_info("VLANs not supported on %s\n", name);
return -EOPNOTSUPP;
}
if (vlan_find_dev(real_dev, protocol, vlan_id) != NULL)
return -EEXIST;
return 0;
}
int register_vlan_dev(struct net_device *dev)
{
struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
struct net_device *real_dev = vlan->real_dev;
u16 vlan_id = vlan->vlan_id;
struct vlan_info *vlan_info;
struct vlan_group *grp;
int err;
err = vlan_vid_add(real_dev, vlan->vlan_proto, vlan_id);
if (err)
return err;
vlan_info = rtnl_dereference(real_dev->vlan_info);
/* vlan_info should be there now. vlan_vid_add took care of it */
BUG_ON(!vlan_info);
grp = &vlan_info->grp;
if (grp->nr_vlan_devs == 0) {
err = vlan_gvrp_init_applicant(real_dev);
if (err < 0)
goto out_vid_del;
err = vlan_mvrp_init_applicant(real_dev);
if (err < 0)
goto out_uninit_gvrp;
}
err = vlan_group_prealloc_vid(grp, vlan->vlan_proto, vlan_id);
if (err < 0)
goto out_uninit_mvrp;
err = register_netdevice(dev);
if (err < 0)
goto out_uninit_mvrp;
err = netdev_upper_dev_link(real_dev, dev);
if (err)
goto out_unregister_netdev;
/* Account for reference in struct vlan_dev_priv */
dev_hold(real_dev);
netif_stacked_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->vlan_proto, vlan_id, dev);
grp->nr_vlan_devs++;
return 0;
out_unregister_netdev:
unregister_netdevice(dev);
out_uninit_mvrp:
if (grp->nr_vlan_devs == 0)
vlan_mvrp_uninit_applicant(real_dev);
out_uninit_gvrp:
if (grp->nr_vlan_devs == 0)
vlan_gvrp_uninit_applicant(real_dev);
out_vid_del:
vlan_vid_del(real_dev, vlan->vlan_proto, vlan_id);
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, u16 vlan_id)
{
struct net_device *new_dev;
struct vlan_dev_priv *vlan;
struct net *net = dev_net(real_dev);
struct vlan_net *vn = net_generic(net, vlan_net_id);
char name[IFNAMSIZ];
int err;
if (vlan_id >= VLAN_VID_MASK)
return -ERANGE;
err = vlan_check_real_dev(real_dev, htons(ETH_P_8021Q), vlan_id);
if (err < 0)
return err;
/* Gotta set up the fields for the device. */
switch (vn->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_priv), name, vlan_setup);
if (new_dev == NULL)
return -ENOBUFS;
dev_net_set(new_dev, net);
/* need 4 bytes for extra VLAN header info,
* hope the underlying device can handle it.
*/
new_dev->mtu = real_dev->mtu;
new_dev->priv_flags |= (real_dev->priv_flags & IFF_UNICAST_FLT);
vlan = vlan_dev_priv(new_dev);
vlan->vlan_proto = htons(ETH_P_8021Q);
vlan->vlan_id = vlan_id;
vlan->real_dev = real_dev;
vlan->dent = NULL;
vlan->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_priv *vlan = vlan_dev_priv(vlandev);
/* May be called without an actual change */
if (ether_addr_equal(vlan->real_dev_addr, dev->dev_addr))
return;
/* vlan address was different from the old address and is equal to
* the new address */
if (!ether_addr_equal(vlandev->dev_addr, vlan->real_dev_addr) &&
ether_addr_equal(vlandev->dev_addr, dev->dev_addr))
dev_uc_del(dev, vlandev->dev_addr);
/* vlan address was equal to the old address and is different from
* the new address */
if (ether_addr_equal(vlandev->dev_addr, vlan->real_dev_addr) &&
!ether_addr_equal(vlandev->dev_addr, dev->dev_addr))
dev_uc_add(dev, vlandev->dev_addr);
memcpy(vlan->real_dev_addr, dev->dev_addr, ETH_ALEN);
}
static void vlan_transfer_features(struct net_device *dev,
struct net_device *vlandev)
{
vlandev->gso_max_size = dev->gso_max_size;
if (dev->features & NETIF_F_HW_VLAN_CTAG_TX)
vlandev->hard_header_len = dev->hard_header_len;
else
vlandev->hard_header_len = dev->hard_header_len + VLAN_HLEN;
#if IS_ENABLED(CONFIG_FCOE)
vlandev->fcoe_ddp_xid = dev->fcoe_ddp_xid;
#endif
netdev_update_features(vlandev);
}
static void __vlan_device_event(struct net_device *dev, unsigned long event)
{
switch (event) {
case NETDEV_CHANGENAME:
vlan_proc_
