561 lines
13 KiB
C
561 lines
13 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
#include <linux/skbuff.h>
|
|
#include <linux/netdevice.h>
|
|
#include <linux/if_vlan.h>
|
|
#include <linux/netpoll.h>
|
|
#include <linux/export.h>
|
|
#include <net/gro.h>
|
|
#include "vlan.h"
|
|
|
|
bool vlan_do_receive(struct sk_buff **skbp)
|
|
{
|
|
struct sk_buff *skb = *skbp;
|
|
__be16 vlan_proto = skb->vlan_proto;
|
|
u16 vlan_id = skb_vlan_tag_get_id(skb);
|
|
struct net_device *vlan_dev;
|
|
struct vlan_pcpu_stats *rx_stats;
|
|
|
|
vlan_dev = vlan_find_dev(skb->dev, vlan_proto, vlan_id);
|
|
if (!vlan_dev)
|
|
return false;
|
|
|
|
skb = *skbp = skb_share_check(skb, GFP_ATOMIC);
|
|
if (unlikely(!skb))
|
|
return false;
|
|
|
|
if (unlikely(!(vlan_dev->flags & IFF_UP))) {
|
|
kfree_skb(skb);
|
|
*skbp = NULL;
|
|
return false;
|
|
}
|
|
|
|
skb->dev = vlan_dev;
|
|
if (unlikely(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 (ether_addr_equal_64bits(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) &&
|
|
!netif_is_macvlan_port(vlan_dev) &&
|
|
!netif_is_bridge_port(vlan_dev)) {
|
|
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_inner_tag(skb, skb->vlan_proto,
|
|
skb->vlan_tci, skb->mac_len);
|
|
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);
|
|
__vlan_hwaccel_clear_tag(skb);
|
|
|
|
rx_stats = this_cpu_ptr(vlan_dev_priv(vlan_dev)->vlan_pcpu_stats);
|
|
|
|
u64_stats_update_begin(&rx_stats->syncp);
|
|
u64_stats_inc(&rx_stats->rx_packets);
|
|
u64_stats_add(&rx_stats->rx_bytes, skb->len);
|
|
if (skb->pkt_type == PACKET_MULTICAST)
|
|
u64_stats_inc(&rx_stats->rx_multicast);
|
|
u64_stats_update_end(&rx_stats->syncp);
|
|
|
|
return true;
|
|
}
|
|
|
|
/* Must be invoked with rcu_read_lock. */
|
|
struct net_device *__vlan_find_dev_deep_rcu(struct net_device *dev,
|
|
__be16 vlan_proto, u16 vlan_id)
|
|
{
|
|
struct vlan_info *vlan_info = rcu_dereference(dev->vlan_info);
|
|
|
|
if (vlan_info) {
|
|
return vlan_group_get_device(&vlan_info->grp,
|
|
vlan_proto, vlan_id);
|
|
} else {
|
|
/*
|
|
* Lower devices of master uppers (bonding, team) do not have
|
|
* grp assigned to themselves. Grp is assigned to upper device
|
|
* instead.
|
|
*/
|
|
struct net_device *upper_dev;
|
|
|
|
upper_dev = netdev_master_upper_dev_get_rcu(dev);
|
|
if (upper_dev)
|
|
return __vlan_find_dev_deep_rcu(upper_dev,
|
|
vlan_proto, vlan_id);
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL(__vlan_find_dev_deep_rcu);
|
|
|
|
struct net_device *vlan_dev_real_dev(const struct net_device *dev)
|
|
{
|
|
struct net_device *ret = vlan_dev_priv(dev)->real_dev;
|
|
|
|
while (is_vlan_dev(ret))
|
|
ret = vlan_dev_priv(ret)->real_dev;
|
|
|
|
return ret;
|
|
}
|
|
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);
|
|
|
|
__be16 vlan_dev_vlan_proto(const struct net_device *dev)
|
|
{
|
|
return vlan_dev_priv(dev)->vlan_proto;
|
|
}
|
|
EXPORT_SYMBOL(vlan_dev_vlan_proto);
|
|
|
|
/*
|
|
* vlan info and vid list
|
|
*/
|
|
|
|
static void vlan_group_free(struct vlan_group *grp)
|
|
{
|
|
int i, j;
|
|
|
|
for (i = 0; i < VLAN_PROTO_NUM; i++)
|
|
for (j = 0; j < VLAN_GROUP_ARRAY_SPLIT_PARTS; j++)
|
|
kfree(grp->vlan_devices_arrays[i][j]);
|
|
}
|
|
|
|
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;
|
|
__be16 proto;
|
|
u16 vid;
|
|
int refcount;
|
|
};
|
|
|
|
static bool vlan_hw_filter_capable(const struct net_device *dev, __be16 proto)
|
|
{
|
|
if (proto == htons(ETH_P_8021Q) &&
|
|
dev->features & NETIF_F_HW_VLAN_CTAG_FILTER)
|
|
return true;
|
|
if (proto == htons(ETH_P_8021AD) &&
|
|
dev->features & NETIF_F_HW_VLAN_STAG_FILTER)
|
|
return true;
|
|
return false;
|
|
}
|
|
|
|
static struct vlan_vid_info *vlan_vid_info_get(struct vlan_info *vlan_info,
|
|
__be16 proto, u16 vid)
|
|
{
|
|
struct vlan_vid_info *vid_info;
|
|
|
|
list_for_each_entry(vid_info, &vlan_info->vid_list, list) {
|
|
if (vid_info->proto == proto && vid_info->vid == vid)
|
|
return vid_info;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static struct vlan_vid_info *vlan_vid_info_alloc(__be16 proto, u16 vid)
|
|
{
|
|
struct vlan_vid_info *vid_info;
|
|
|
|
vid_info = kzalloc(sizeof(struct vlan_vid_info), GFP_KERNEL);
|
|
if (!vid_info)
|
|
return NULL;
|
|
vid_info->proto = proto;
|
|
vid_info->vid = vid;
|
|
|
|
return vid_info;
|
|
}
|
|
|
|
static int vlan_add_rx_filter_info(struct net_device *dev, __be16 proto, u16 vid)
|
|
{
|
|
if (!vlan_hw_filter_capable(dev, proto))
|
|
return 0;
|
|
|
|
if (netif_device_present(dev))
|
|
return dev->netdev_ops->ndo_vlan_rx_add_vid(dev, proto, vid);
|
|
else
|
|
return -ENODEV;
|
|
}
|
|
|
|
static int vlan_kill_rx_filter_info(struct net_device *dev, __be16 proto, u16 vid)
|
|
{
|
|
if (!vlan_hw_filter_capable(dev, proto))
|
|
return 0;
|
|
|
|
if (netif_device_present(dev))
|
|
return dev->netdev_ops->ndo_vlan_rx_kill_vid(dev, proto, vid);
|
|
else
|
|
return -ENODEV;
|
|
}
|
|
|
|
int vlan_for_each(struct net_device *dev,
|
|
int (*action)(struct net_device *dev, int vid, void *arg),
|
|
void *arg)
|
|
{
|
|
struct vlan_vid_info *vid_info;
|
|
struct vlan_info *vlan_info;
|
|
struct net_device *vdev;
|
|
int ret;
|
|
|
|
ASSERT_RTNL();
|
|
|
|
vlan_info = rtnl_dereference(dev->vlan_info);
|
|
if (!vlan_info)
|
|
return 0;
|
|
|
|
list_for_each_entry(vid_info, &vlan_info->vid_list, list) {
|
|
vdev = vlan_group_get_device(&vlan_info->grp, vid_info->proto,
|
|
vid_info->vid);
|
|
ret = action(vdev, vid_info->vid, arg);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(vlan_for_each);
|
|
|
|
int vlan_filter_push_vids(struct vlan_info *vlan_info, __be16 proto)
|
|
{
|
|
struct net_device *real_dev = vlan_info->real_dev;
|
|
struct vlan_vid_info *vlan_vid_info;
|
|
int err;
|
|
|
|
list_for_each_entry(vlan_vid_info, &vlan_info->vid_list, list) {
|
|
if (vlan_vid_info->proto == proto) {
|
|
err = vlan_add_rx_filter_info(real_dev, proto,
|
|
vlan_vid_info->vid);
|
|
if (err)
|
|
goto unwind;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
|
|
unwind:
|
|
list_for_each_entry_continue_reverse(vlan_vid_info,
|
|
&vlan_info->vid_list, list) {
|
|
if (vlan_vid_info->proto == proto)
|
|
vlan_kill_rx_filter_info(real_dev, proto,
|
|
vlan_vid_info->vid);
|
|
}
|
|
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(vlan_filter_push_vids);
|
|
|
|
void vlan_filter_drop_vids(struct vlan_info *vlan_info, __be16 proto)
|
|
{
|
|
struct vlan_vid_info *vlan_vid_info;
|
|
|
|
list_for_each_entry(vlan_vid_info, &vlan_info->vid_list, list)
|
|
if (vlan_vid_info->proto == proto)
|
|
vlan_kill_rx_filter_info(vlan_info->real_dev,
|
|
vlan_vid_info->proto,
|
|
vlan_vid_info->vid);
|
|
}
|
|
EXPORT_SYMBOL(vlan_filter_drop_vids);
|
|
|
|
static int __vlan_vid_add(struct vlan_info *vlan_info, __be16 proto, u16 vid,
|
|
struct vlan_vid_info **pvid_info)
|
|
{
|
|
struct net_device *dev = vlan_info->real_dev;
|
|
struct vlan_vid_info *vid_info;
|
|
int err;
|
|
|
|
vid_info = vlan_vid_info_alloc(proto, vid);
|
|
if (!vid_info)
|
|
return -ENOMEM;
|
|
|
|
err = vlan_add_rx_filter_info(dev, proto, 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, __be16 proto, u16 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, proto, vid);
|
|
if (!vid_info) {
|
|
err = __vlan_vid_add(vlan_info, proto, 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;
|
|
__be16 proto = vid_info->proto;
|
|
u16 vid = vid_info->vid;
|
|
int err;
|
|
|
|
err = vlan_kill_rx_filter_info(dev, proto, vid);
|
|
if (err && dev->reg_state != NETREG_UNREGISTERING)
|
|
netdev_warn(dev, "failed to kill vid %04x/%d\n", proto, vid);
|
|
|
|
list_del(&vid_info->list);
|
|
kfree(vid_info);
|
|
vlan_info->nr_vids--;
|
|
}
|
|
|
|
void vlan_vid_del(struct net_device *dev, __be16 proto, u16 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, proto, 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) {
|
|
if (!vlan_hw_filter_capable(by_dev, vid_info->proto))
|
|
continue;
|
|
err = vlan_vid_add(dev, vid_info->proto, vid_info->vid);
|
|
if (err)
|
|
goto unwind;
|
|
}
|
|
return 0;
|
|
|
|
unwind:
|
|
list_for_each_entry_continue_reverse(vid_info,
|
|
&vlan_info->vid_list,
|
|
list) {
|
|
if (!vlan_hw_filter_capable(by_dev, vid_info->proto))
|
|
continue;
|
|
vlan_vid_del(dev, vid_info->proto, 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) {
|
|
if (!vlan_hw_filter_capable(by_dev, vid_info->proto))
|
|
continue;
|
|
vlan_vid_del(dev, vid_info->proto, vid_info->vid);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(vlan_vids_del_by_dev);
|
|
|
|
bool vlan_uses_dev(const struct net_device *dev)
|
|
{
|
|
struct vlan_info *vlan_info;
|
|
|
|
ASSERT_RTNL();
|
|
|
|
vlan_info = rtnl_dereference(dev->vlan_info);
|
|
if (!vlan_info)
|
|
return false;
|
|
return vlan_info->grp.nr_vlan_devs ? true : false;
|
|
}
|
|
EXPORT_SYMBOL(vlan_uses_dev);
|
|
|
|
static struct sk_buff *vlan_gro_receive(struct list_head *head,
|
|
struct sk_buff *skb)
|
|
{
|
|
const struct packet_offload *ptype;
|
|
unsigned int hlen, off_vlan;
|
|
struct sk_buff *pp = NULL;
|
|
struct vlan_hdr *vhdr;
|
|
struct sk_buff *p;
|
|
__be16 type;
|
|
int flush = 1;
|
|
|
|
off_vlan = skb_gro_offset(skb);
|
|
hlen = off_vlan + sizeof(*vhdr);
|
|
vhdr = skb_gro_header(skb, hlen, off_vlan);
|
|
if (unlikely(!vhdr))
|
|
goto out;
|
|
|
|
NAPI_GRO_CB(skb)->network_offsets[NAPI_GRO_CB(skb)->encap_mark] = hlen;
|
|
|
|
type = vhdr->h_vlan_encapsulated_proto;
|
|
|
|
ptype = gro_find_receive_by_type(type);
|
|
if (!ptype)
|
|
goto out;
|
|
|
|
flush = 0;
|
|
|
|
list_for_each_entry(p, head, list) {
|
|
struct vlan_hdr *vhdr2;
|
|
|
|
if (!NAPI_GRO_CB(p)->same_flow)
|
|
continue;
|
|
|
|
vhdr2 = (struct vlan_hdr *)(p->data + off_vlan);
|
|
if (compare_vlan_header(vhdr, vhdr2))
|
|
NAPI_GRO_CB(p)->same_flow = 0;
|
|
}
|
|
|
|
skb_gro_pull(skb, sizeof(*vhdr));
|
|
skb_gro_postpull_rcsum(skb, vhdr, sizeof(*vhdr));
|
|
|
|
pp = indirect_call_gro_receive_inet(ptype->callbacks.gro_receive,
|
|
ipv6_gro_receive, inet_gro_receive,
|
|
head, skb);
|
|
|
|
out:
|
|
skb_gro_flush_final(skb, pp, flush);
|
|
|
|
return pp;
|
|
}
|
|
|
|
static int vlan_gro_complete(struct sk_buff *skb, int nhoff)
|
|
{
|
|
struct vlan_hdr *vhdr = (struct vlan_hdr *)(skb->data + nhoff);
|
|
__be16 type = vhdr->h_vlan_encapsulated_proto;
|
|
struct packet_offload *ptype;
|
|
int err = -ENOENT;
|
|
|
|
ptype = gro_find_complete_by_type(type);
|
|
if (ptype)
|
|
err = INDIRECT_CALL_INET(ptype->callbacks.gro_complete,
|
|
ipv6_gro_complete, inet_gro_complete,
|
|
skb, nhoff + sizeof(*vhdr));
|
|
|
|
return err;
|
|
}
|
|
|
|
static struct packet_offload vlan_packet_offloads[] __read_mostly = {
|
|
{
|
|
.type = cpu_to_be16(ETH_P_8021Q),
|
|
.priority = 10,
|
|
.callbacks = {
|
|
.gro_receive = vlan_gro_receive,
|
|
.gro_complete = vlan_gro_complete,
|
|
},
|
|
},
|
|
{
|
|
.type = cpu_to_be16(ETH_P_8021AD),
|
|
.priority = 10,
|
|
.callbacks = {
|
|
.gro_receive = vlan_gro_receive,
|
|
.gro_complete = vlan_gro_complete,
|
|
},
|
|
},
|
|
};
|
|
|
|
static int __init vlan_offload_init(void)
|
|
{
|
|
unsigned int i;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(vlan_packet_offloads); i++)
|
|
dev_add_offload(&vlan_packet_offloads[i]);
|
|
|
|
return 0;
|
|
}
|
|
|
|
fs_initcall(vlan_offload_init);
|