372 строки
8.3 KiB
C
372 строки
8.3 KiB
C
#include <linux/skbuff.h>
|
|
#include <linux/netdevice.h>
|
|
#include <linux/if_vlan.h>
|
|
#include <linux/netpoll.h>
|
|
#include <linux/export.h>
|
|
#include "vlan.h"
|
|
|
|
bool vlan_do_receive(struct sk_buff **skbp, bool last_handler)
|
|
{
|
|
struct sk_buff *skb = *skbp;
|
|
u16 vlan_id = skb->vlan_tci & VLAN_VID_MASK;
|
|
struct net_device *vlan_dev;
|
|
struct vlan_pcpu_stats *rx_stats;
|
|
|
|
vlan_dev = vlan_find_dev(skb->dev, vlan_id);
|
|
if (!vlan_dev) {
|
|
/* Only the last call to vlan_do_receive() should change
|
|
* pkt_type to PACKET_OTHERHOST
|
|
*/
|
|
if (vlan_id && last_handler)
|
|
skb->pkt_type = PACKET_OTHERHOST;
|
|
return false;
|
|
}
|
|
|
|
skb = *skbp = skb_share_check(skb, GFP_ATOMIC);
|
|
if (unlikely(!skb))
|
|
return false;
|
|
|
|
skb->dev = vlan_dev;
|
|
if (skb->pkt_type == PACKET_OTHERHOST) {
|
|
/* Our lower layer thinks this is not local, let's make sure.
|
|
* This allows the VLAN to have a different MAC than the
|
|
* underlying device, and still route correctly. */
|
|
if (!compare_ether_addr(eth_hdr(skb)->h_dest,
|
|
vlan_dev->dev_addr))
|
|
skb->pkt_type = PACKET_HOST;
|
|
}
|
|
|
|
if (!(vlan_dev_priv(vlan_dev)->flags & VLAN_FLAG_REORDER_HDR)) {
|
|
unsigned int offset = skb->data - skb_mac_header(skb);
|
|
|
|
/*
|
|
* vlan_insert_tag expect skb->data pointing to mac header.
|
|
* So change skb->data before calling it and change back to
|
|
* original position later
|
|
*/
|
|
skb_push(skb, offset);
|
|
skb = *skbp = vlan_insert_tag(skb, skb->vlan_tci);
|
|
if (!skb)
|
|
return false;
|
|
skb_pull(skb, offset + VLAN_HLEN);
|
|
skb_reset_mac_len(skb);
|
|
}
|
|
|
|
skb->priority = vlan_get_ingress_priority(vlan_dev, skb->vlan_tci);
|
|
skb->vlan_tci = 0;
|
|
|
|
rx_stats = this_cpu_ptr(vlan_dev_priv(vlan_dev)->vlan_pcpu_stats);
|
|
|
|
u64_stats_update_begin(&rx_stats->syncp);
|
|
rx_stats->rx_packets++;
|
|
rx_stats->rx_bytes += skb->len;
|
|
if (skb->pkt_type == PACKET_MULTICAST)
|
|
rx_stats->rx_multicast++;
|
|
u64_stats_update_end(&rx_stats->syncp);
|
|
|
|
return true;
|
|
}
|
|
|
|
/* Must be invoked with rcu_read_lock or with RTNL. */
|
|
struct net_device *__vlan_find_dev_deep(struct net_device *real_dev,
|
|
u16 vlan_id)
|
|
{
|
|
struct vlan_info *vlan_info = rcu_dereference_rtnl(real_dev->vlan_info);
|
|
|
|
if (vlan_info) {
|
|
return vlan_group_get_device(&vlan_info->grp, vlan_id);
|
|
} else {
|
|
/*
|
|
* Bonding slaves do not have grp assigned to themselves.
|
|
* Grp is assigned to bonding master instead.
|
|
*/
|
|
if (netif_is_bond_slave(real_dev))
|
|
return __vlan_find_dev_deep(real_dev->master, vlan_id);
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL(__vlan_find_dev_deep);
|
|
|
|
struct net_device *vlan_dev_real_dev(const struct net_device *dev)
|
|
{
|
|
return vlan_dev_priv(dev)->real_dev;
|
|
}
|
|
EXPORT_SYMBOL(vlan_dev_real_dev);
|
|
|
|
u16 vlan_dev_vlan_id(const struct net_device *dev)
|
|
{
|
|
return vlan_dev_priv(dev)->vlan_id;
|
|
}
|
|
EXPORT_SYMBOL(vlan_dev_vlan_id);
|
|
|
|
static struct sk_buff *vlan_reorder_header(struct sk_buff *skb)
|
|
{
|
|
if (skb_cow(skb, skb_headroom(skb)) < 0)
|
|
return NULL;
|
|
memmove(skb->data - ETH_HLEN, skb->data - VLAN_ETH_HLEN, 2 * ETH_ALEN);
|
|
skb->mac_header += VLAN_HLEN;
|
|
skb_reset_mac_len(skb);
|
|
return skb;
|
|
}
|
|
|
|
struct sk_buff *vlan_untag(struct sk_buff *skb)
|
|
{
|
|
struct vlan_hdr *vhdr;
|
|
u16 vlan_tci;
|
|
|
|
if (unlikely(vlan_tx_tag_present(skb))) {
|
|
/* vlan_tci is already set-up so leave this for another time */
|
|
return skb;
|
|
}
|
|
|
|
skb = skb_share_check(skb, GFP_ATOMIC);
|
|
if (unlikely(!skb))
|
|
goto err_free;
|
|
|
|
if (unlikely(!pskb_may_pull(skb, VLAN_HLEN)))
|
|
goto err_free;
|
|
|
|
vhdr = (struct vlan_hdr *) skb->data;
|
|
vlan_tci = ntohs(vhdr->h_vlan_TCI);
|
|
__vlan_hwaccel_put_tag(skb, vlan_tci);
|
|
|
|
skb_pull_rcsum(skb, VLAN_HLEN);
|
|
vlan_set_encap_proto(skb, vhdr);
|
|
|
|
skb = vlan_reorder_header(skb);
|
|
if (unlikely(!skb))
|
|
goto err_free;
|
|
|
|
skb_reset_network_header(skb);
|
|
skb_reset_transport_header(skb);
|
|
return skb;
|
|
|
|
err_free:
|
|
kfree_skb(skb);
|
|
return NULL;
|
|
}
|
|
|
|
|
|
/*
|
|
* vlan info and vid list
|
|
*/
|
|
|
|
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]);
|
|
}
|
|
|
|
static void vlan_info_free(struct vlan_info *vlan_info)
|
|
{
|
|
vlan_group_free(&vlan_info->grp);
|
|
kfree(vlan_info);
|
|
}
|
|
|
|
static void vlan_info_rcu_free(struct rcu_head *rcu)
|
|
{
|
|
vlan_info_free(container_of(rcu, struct vlan_info, rcu));
|
|
}
|
|
|
|
static struct vlan_info *vlan_info_alloc(struct net_device *dev)
|
|
{
|
|
struct vlan_info *vlan_info;
|
|
|
|
vlan_info = kzalloc(sizeof(struct vlan_info), GFP_KERNEL);
|
|
if (!vlan_info)
|
|
return NULL;
|
|
|
|
vlan_info->real_dev = dev;
|
|
INIT_LIST_HEAD(&vlan_info->vid_list);
|
|
return vlan_info;
|
|
}
|
|
|
|
struct vlan_vid_info {
|
|
struct list_head list;
|
|
unsigned short vid;
|
|
int refcount;
|
|
};
|
|
|
|
static struct vlan_vid_info *vlan_vid_info_get(struct vlan_info *vlan_info,
|
|
unsigned short vid)
|
|
{
|
|
struct vlan_vid_info *vid_info;
|
|
|
|
list_for_each_entry(vid_info, &vlan_info->vid_list, list) {
|
|
if (vid_info->vid == vid)
|
|
return vid_info;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static struct vlan_vid_info *vlan_vid_info_alloc(unsigned short vid)
|
|
{
|
|
struct vlan_vid_info *vid_info;
|
|
|
|
vid_info = kzalloc(sizeof(struct vlan_vid_info), GFP_KERNEL);
|
|
if (!vid_info)
|
|
return NULL;
|
|
vid_info->vid = vid;
|
|
|
|
return vid_info;
|
|
}
|
|
|
|
static int __vlan_vid_add(struct vlan_info *vlan_info, unsigned short vid,
|
|
struct vlan_vid_info **pvid_info)
|
|
{
|
|
struct net_device *dev = vlan_info->real_dev;
|
|
const struct net_device_ops *ops = dev->netdev_ops;
|
|
struct vlan_vid_info *vid_info;
|
|
int err;
|
|
|
|
vid_info = vlan_vid_info_alloc(vid);
|
|
if (!vid_info)
|
|
return -ENOMEM;
|
|
|
|
if ((dev->features & NETIF_F_HW_VLAN_FILTER) &&
|
|
ops->ndo_vlan_rx_add_vid) {
|
|
err = ops->ndo_vlan_rx_add_vid(dev, vid);
|
|
if (err) {
|
|
kfree(vid_info);
|
|
return err;
|
|
}
|
|
}
|
|
list_add(&vid_info->list, &vlan_info->vid_list);
|
|
vlan_info->nr_vids++;
|
|
*pvid_info = vid_info;
|
|
return 0;
|
|
}
|
|
|
|
int vlan_vid_add(struct net_device *dev, unsigned short vid)
|
|
{
|
|
struct vlan_info *vlan_info;
|
|
struct vlan_vid_info *vid_info;
|
|
bool vlan_info_created = false;
|
|
int err;
|
|
|
|
ASSERT_RTNL();
|
|
|
|
vlan_info = rtnl_dereference(dev->vlan_info);
|
|
if (!vlan_info) {
|
|
vlan_info = vlan_info_alloc(dev);
|
|
if (!vlan_info)
|
|
return -ENOMEM;
|
|
vlan_info_created = true;
|
|
}
|
|
vid_info = vlan_vid_info_get(vlan_info, vid);
|
|
if (!vid_info) {
|
|
err = __vlan_vid_add(vlan_info, vid, &vid_info);
|
|
if (err)
|
|
goto out_free_vlan_info;
|
|
}
|
|
vid_info->refcount++;
|
|
|
|
if (vlan_info_created)
|
|
rcu_assign_pointer(dev->vlan_info, vlan_info);
|
|
|
|
return 0;
|
|
|
|
out_free_vlan_info:
|
|
if (vlan_info_created)
|
|
kfree(vlan_info);
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(vlan_vid_add);
|
|
|
|
static void __vlan_vid_del(struct vlan_info *vlan_info,
|
|
struct vlan_vid_info *vid_info)
|
|
{
|
|
struct net_device *dev = vlan_info->real_dev;
|
|
const struct net_device_ops *ops = dev->netdev_ops;
|
|
unsigned short vid = vid_info->vid;
|
|
int err;
|
|
|
|
if ((dev->features & NETIF_F_HW_VLAN_FILTER) &&
|
|
ops->ndo_vlan_rx_kill_vid) {
|
|
err = ops->ndo_vlan_rx_kill_vid(dev, vid);
|
|
if (err) {
|
|
pr_warn("failed to kill vid %d for device %s\n",
|
|
vid, dev->name);
|
|
}
|
|
}
|
|
list_del(&vid_info->list);
|
|
kfree(vid_info);
|
|
vlan_info->nr_vids--;
|
|
}
|
|
|
|
void vlan_vid_del(struct net_device *dev, unsigned short vid)
|
|
{
|
|
struct vlan_info *vlan_info;
|
|
struct vlan_vid_info *vid_info;
|
|
|
|
ASSERT_RTNL();
|
|
|
|
vlan_info = rtnl_dereference(dev->vlan_info);
|
|
if (!vlan_info)
|
|
return;
|
|
|
|
vid_info = vlan_vid_info_get(vlan_info, vid);
|
|
if (!vid_info)
|
|
return;
|
|
vid_info->refcount--;
|
|
if (vid_info->refcount == 0) {
|
|
__vlan_vid_del(vlan_info, vid_info);
|
|
if (vlan_info->nr_vids == 0) {
|
|
RCU_INIT_POINTER(dev->vlan_info, NULL);
|
|
call_rcu(&vlan_info->rcu, vlan_info_rcu_free);
|
|
}
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(vlan_vid_del);
|
|
|
|
int vlan_vids_add_by_dev(struct net_device *dev,
|
|
const struct net_device *by_dev)
|
|
{
|
|
struct vlan_vid_info *vid_info;
|
|
struct vlan_info *vlan_info;
|
|
int err;
|
|
|
|
ASSERT_RTNL();
|
|
|
|
vlan_info = rtnl_dereference(by_dev->vlan_info);
|
|
if (!vlan_info)
|
|
return 0;
|
|
|
|
list_for_each_entry(vid_info, &vlan_info->vid_list, list) {
|
|
err = vlan_vid_add(dev, vid_info->vid);
|
|
if (err)
|
|
goto unwind;
|
|
}
|
|
return 0;
|
|
|
|
unwind:
|
|
list_for_each_entry_continue_reverse(vid_info,
|
|
&vlan_info->vid_list,
|
|
list) {
|
|
vlan_vid_del(dev, vid_info->vid);
|
|
}
|
|
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(vlan_vids_add_by_dev);
|
|
|
|
void vlan_vids_del_by_dev(struct net_device *dev,
|
|
const struct net_device *by_dev)
|
|
{
|
|
struct vlan_vid_info *vid_info;
|
|
struct vlan_info *vlan_info;
|
|
|
|
ASSERT_RTNL();
|
|
|
|
vlan_info = rtnl_dereference(by_dev->vlan_info);
|
|
if (!vlan_info)
|
|
return;
|
|
|
|
list_for_each_entry(vid_info, &vlan_info->vid_list, list)
|
|
vlan_vid_del(dev, vid_info->vid);
|
|
}
|
|
EXPORT_SYMBOL(vlan_vids_del_by_dev);
|