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linux-sg2042/drivers/net/veth.c

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/*
* drivers/net/veth.c
*
* Copyright (C) 2007 OpenVZ http://openvz.org, SWsoft Inc
*
* Author: Pavel Emelianov <xemul@openvz.org>
* Ethtool interface from: Eric W. Biederman <ebiederm@xmission.com>
*
*/
#include <linux/netdevice.h>
#include <linux/slab.h>
#include <linux/ethtool.h>
#include <linux/etherdevice.h>
#include <linux/u64_stats_sync.h>
#include <net/rtnetlink.h>
#include <net/dst.h>
#include <net/xfrm.h>
#include <linux/veth.h>
#include <linux/module.h>
#include <linux/bpf.h>
#include <linux/filter.h>
#include <linux/ptr_ring.h>
#include <linux/skb_array.h>
#include <linux/bpf_trace.h>
#define DRV_NAME "veth"
#define DRV_VERSION "1.0"
#define VETH_RING_SIZE 256
#define VETH_XDP_HEADROOM (XDP_PACKET_HEADROOM + NET_IP_ALIGN)
struct pcpu_vstats {
u64 packets;
u64 bytes;
struct u64_stats_sync syncp;
};
struct veth_priv {
struct napi_struct xdp_napi;
struct net_device *dev;
struct bpf_prog __rcu *xdp_prog;
struct bpf_prog *_xdp_prog;
struct net_device __rcu *peer;
atomic64_t dropped;
unsigned requested_headroom;
bool rx_notify_masked;
struct ptr_ring xdp_ring;
struct xdp_rxq_info xdp_rxq;
};
/*
* ethtool interface
*/
static struct {
const char string[ETH_GSTRING_LEN];
} ethtool_stats_keys[] = {
{ "peer_ifindex" },
};
static int veth_get_link_ksettings(struct net_device *dev,
struct ethtool_link_ksettings *cmd)
{
cmd->base.speed = SPEED_10000;
cmd->base.duplex = DUPLEX_FULL;
cmd->base.port = PORT_TP;
cmd->base.autoneg = AUTONEG_DISABLE;
return 0;
}
static void veth_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
{
strlcpy(info->driver, DRV_NAME, sizeof(info->driver));
strlcpy(info->version, DRV_VERSION, sizeof(info->version));
}
static void veth_get_strings(struct net_device *dev, u32 stringset, u8 *buf)
{
switch(stringset) {
case ETH_SS_STATS:
memcpy(buf, &ethtool_stats_keys, sizeof(ethtool_stats_keys));
break;
}
}
static int veth_get_sset_count(struct net_device *dev, int sset)
{
switch (sset) {
case ETH_SS_STATS:
return ARRAY_SIZE(ethtool_stats_keys);
default:
return -EOPNOTSUPP;
}
}
static void veth_get_ethtool_stats(struct net_device *dev,
struct ethtool_stats *stats, u64 *data)
{
struct veth_priv *priv = netdev_priv(dev);
struct net_device *peer = rtnl_dereference(priv->peer);
data[0] = peer ? peer->ifindex : 0;
}
static const struct ethtool_ops veth_ethtool_ops = {
.get_drvinfo = veth_get_drvinfo,
.get_link = ethtool_op_get_link,
.get_strings = veth_get_strings,
.get_sset_count = veth_get_sset_count,
.get_ethtool_stats = veth_get_ethtool_stats,
.get_link_ksettings = veth_get_link_ksettings,
};
/* general routines */
static void __veth_xdp_flush(struct veth_priv *priv)
{
/* Write ptr_ring before reading rx_notify_masked */
smp_mb();
if (!priv->rx_notify_masked) {
priv->rx_notify_masked = true;
napi_schedule(&priv->xdp_napi);
}
}
static int veth_xdp_rx(struct veth_priv *priv, struct sk_buff *skb)
{
if (unlikely(ptr_ring_produce(&priv->xdp_ring, skb))) {
dev_kfree_skb_any(skb);
return NET_RX_DROP;
}
return NET_RX_SUCCESS;
}
static int veth_forward_skb(struct net_device *dev, struct sk_buff *skb, bool xdp)
{
struct veth_priv *priv = netdev_priv(dev);
return __dev_forward_skb(dev, skb) ?: xdp ?
veth_xdp_rx(priv, skb) :
netif_rx(skb);
}
static netdev_tx_t veth_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct veth_priv *rcv_priv, *priv = netdev_priv(dev);
struct net_device *rcv;
int length = skb->len;
bool rcv_xdp = false;
rcu_read_lock();
rcv = rcu_dereference(priv->peer);
if (unlikely(!rcv)) {
kfree_skb(skb);
goto drop;
}
rcv_priv = netdev_priv(rcv);
rcv_xdp = rcu_access_pointer(rcv_priv->xdp_prog);
if (likely(veth_forward_skb(rcv, skb, rcv_xdp) == NET_RX_SUCCESS)) {
struct pcpu_vstats *stats = this_cpu_ptr(dev->vstats);
u64_stats_update_begin(&stats->syncp);
stats->bytes += length;
stats->packets++;
u64_stats_update_end(&stats->syncp);
} else {
drop:
atomic64_inc(&priv->dropped);
}
if (rcv_xdp)
__veth_xdp_flush(rcv_priv);
rcu_read_unlock();
return NETDEV_TX_OK;
}
static u64 veth_stats_one(struct pcpu_vstats *result, struct net_device *dev)
{
struct veth_priv *priv = netdev_priv(dev);
int cpu;
result->packets = 0;
result->bytes = 0;
for_each_possible_cpu(cpu) {
struct pcpu_vstats *stats = per_cpu_ptr(dev->vstats, cpu);
u64 packets, bytes;
unsigned int start;
do {
start = u64_stats_fetch_begin_irq(&stats->syncp);
packets = stats->packets;
bytes = stats->bytes;
} while (u64_stats_fetch_retry_irq(&stats->syncp, start));
result->packets += packets;
result->bytes += bytes;
}
return atomic64_read(&priv->dropped);
}
static void veth_get_stats64(struct net_device *dev,
struct rtnl_link_stats64 *tot)
{
struct veth_priv *priv = netdev_priv(dev);
struct net_device *peer;
struct pcpu_vstats one;
tot->tx_dropped = veth_stats_one(&one, dev);
tot->tx_bytes = one.bytes;
tot->tx_packets = one.packets;
rcu_read_lock();
peer = rcu_dereference(priv->peer);
if (peer) {
tot->rx_dropped = veth_stats_one(&one, peer);
tot->rx_bytes = one.bytes;
tot->rx_packets = one.packets;
}
rcu_read_unlock();
}
/* fake multicast ability */
static void veth_set_multicast_list(struct net_device *dev)
{
}
static struct sk_buff *veth_build_skb(void *head, int headroom, int len,
int buflen)
{
struct sk_buff *skb;
if (!buflen) {
buflen = SKB_DATA_ALIGN(headroom + len) +
SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
}
skb = build_skb(head, buflen);
if (!skb)
return NULL;
skb_reserve(skb, headroom);
skb_put(skb, len);
return skb;
}
static struct sk_buff *veth_xdp_rcv_skb(struct veth_priv *priv,
struct sk_buff *skb)
{
u32 pktlen, headroom, act, metalen;
void *orig_data, *orig_data_end;
struct bpf_prog *xdp_prog;
int mac_len, delta, off;
struct xdp_buff xdp;
rcu_read_lock();
xdp_prog = rcu_dereference(priv->xdp_prog);
if (unlikely(!xdp_prog)) {
rcu_read_unlock();
goto out;
}
mac_len = skb->data - skb_mac_header(skb);
pktlen = skb->len + mac_len;
headroom = skb_headroom(skb) - mac_len;
if (skb_shared(skb) || skb_head_is_locked(skb) ||
skb_is_nonlinear(skb) || headroom < XDP_PACKET_HEADROOM) {
struct sk_buff *nskb;
int size, head_off;
void *head, *start;
struct page *page;
size = SKB_DATA_ALIGN(VETH_XDP_HEADROOM + pktlen) +
SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
if (size > PAGE_SIZE)
goto drop;
page = alloc_page(GFP_ATOMIC | __GFP_NOWARN);
if (!page)
goto drop;
head = page_address(page);
start = head + VETH_XDP_HEADROOM;
if (skb_copy_bits(skb, -mac_len, start, pktlen)) {
page_frag_free(head);
goto drop;
}
nskb = veth_build_skb(head,
VETH_XDP_HEADROOM + mac_len, skb->len,
PAGE_SIZE);
if (!nskb) {
page_frag_free(head);
goto drop;
}
skb_copy_header(nskb, skb);
head_off = skb_headroom(nskb) - skb_headroom(skb);
skb_headers_offset_update(nskb, head_off);
if (skb->sk)
skb_set_owner_w(nskb, skb->sk);
consume_skb(skb);
skb = nskb;
}
xdp.data_hard_start = skb->head;
xdp.data = skb_mac_header(skb);
xdp.data_end = xdp.data + pktlen;
xdp.data_meta = xdp.data;
xdp.rxq = &priv->xdp_rxq;
orig_data = xdp.data;
orig_data_end = xdp.data_end;
act = bpf_prog_run_xdp(xdp_prog, &xdp);
switch (act) {
case XDP_PASS:
break;
default:
bpf_warn_invalid_xdp_action(act);
case XDP_ABORTED:
trace_xdp_exception(priv->dev, xdp_prog, act);
case XDP_DROP:
goto drop;
}
rcu_read_unlock();
delta = orig_data - xdp.data;
off = mac_len + delta;
if (off > 0)
__skb_push(skb, off);
else if (off < 0)
__skb_pull(skb, -off);
skb->mac_header -= delta;
off = xdp.data_end - orig_data_end;
if (off != 0)
__skb_put(skb, off);
skb->protocol = eth_type_trans(skb, priv->dev);
metalen = xdp.data - xdp.data_meta;
if (metalen)
skb_metadata_set(skb, metalen);
out:
return skb;
drop:
rcu_read_unlock();
kfree_skb(skb);
return NULL;
}
static int veth_xdp_rcv(struct veth_priv *priv, int budget)
{
int i, done = 0;
for (i = 0; i < budget; i++) {
struct sk_buff *skb = __ptr_ring_consume(&priv->xdp_ring);
if (!skb)
break;
skb = veth_xdp_rcv_skb(priv, skb);
if (skb)
napi_gro_receive(&priv->xdp_napi, skb);
done++;
}
return done;
}
static int veth_poll(struct napi_struct *napi, int budget)
{
struct veth_priv *priv =
container_of(napi, struct veth_priv, xdp_napi);
int done;
done = veth_xdp_rcv(priv, budget);
if (done < budget && napi_complete_done(napi, done)) {
/* Write rx_notify_masked before reading ptr_ring */
smp_store_mb(priv->rx_notify_masked, false);
if (unlikely(!__ptr_ring_empty(&priv->xdp_ring))) {
priv->rx_notify_masked = true;
napi_schedule(&priv->xdp_napi);
}
}
return done;
}
static int veth_napi_add(struct net_device *dev)
{
struct veth_priv *priv = netdev_priv(dev);
int err;
err = ptr_ring_init(&priv->xdp_ring, VETH_RING_SIZE, GFP_KERNEL);
if (err)
return err;
netif_napi_add(dev, &priv->xdp_napi, veth_poll, NAPI_POLL_WEIGHT);
napi_enable(&priv->xdp_napi);
return 0;
}
static void veth_napi_del(struct net_device *dev)
{
struct veth_priv *priv = netdev_priv(dev);
napi_disable(&priv->xdp_napi);
netif_napi_del(&priv->xdp_napi);
priv->rx_notify_masked = false;
ptr_ring_cleanup(&priv->xdp_ring, __skb_array_destroy_skb);
}
static int veth_enable_xdp(struct net_device *dev)
{
struct veth_priv *priv = netdev_priv(dev);
int err;
if (!xdp_rxq_info_is_reg(&priv->xdp_rxq)) {
err = xdp_rxq_info_reg(&priv->xdp_rxq, dev, 0);
if (err < 0)
return err;
err = xdp_rxq_info_reg_mem_model(&priv->xdp_rxq,
MEM_TYPE_PAGE_SHARED, NULL);
if (err < 0)
goto err;
err = veth_napi_add(dev);
if (err)
goto err;
}
rcu_assign_pointer(priv->xdp_prog, priv->_xdp_prog);
return 0;
err:
xdp_rxq_info_unreg(&priv->xdp_rxq);
return err;
}
static void veth_disable_xdp(struct net_device *dev)
{
struct veth_priv *priv = netdev_priv(dev);
rcu_assign_pointer(priv->xdp_prog, NULL);
veth_napi_del(dev);
xdp_rxq_info_unreg(&priv->xdp_rxq);
}
static int veth_open(struct net_device *dev)
{
struct veth_priv *priv = netdev_priv(dev);
struct net_device *peer = rtnl_dereference(priv->peer);
int err;
if (!peer)
return -ENOTCONN;
if (priv->_xdp_prog) {
err = veth_enable_xdp(dev);
if (err)
return err;
}
if (peer->flags & IFF_UP) {
netif_carrier_on(dev);
netif_carrier_on(peer);
}
return 0;
}
static int veth_close(struct net_device *dev)
{
struct veth_priv *priv = netdev_priv(dev);
struct net_device *peer = rtnl_dereference(priv->peer);
netif_carrier_off(dev);
if (peer)
netif_carrier_off(peer);
if (priv->_xdp_prog)
veth_disable_xdp(dev);
return 0;
}
static int is_valid_veth_mtu(int mtu)
{
return mtu >= ETH_MIN_MTU && mtu <= ETH_MAX_MTU;
}
static int veth_dev_init(struct net_device *dev)
{
dev->vstats = netdev_alloc_pcpu_stats(struct pcpu_vstats);
if (!dev->vstats)
return -ENOMEM;
return 0;
}
static void veth_dev_free(struct net_device *dev)
{
free_percpu(dev->vstats);
}
#ifdef CONFIG_NET_POLL_CONTROLLER
static void veth_poll_controller(struct net_device *dev)
{
/* veth only receives frames when its peer sends one
* Since it has nothing to do with disabling irqs, we are guaranteed
* never to have pending data when we poll for it so
* there is nothing to do here.
*
* We need this though so netpoll recognizes us as an interface that
* supports polling, which enables bridge devices in virt setups to
* still use netconsole
*/
}
#endif /* CONFIG_NET_POLL_CONTROLLER */
static int veth_get_iflink(const struct net_device *dev)
{
struct veth_priv *priv = netdev_priv(dev);
struct net_device *peer;
int iflink;
rcu_read_lock();
peer = rcu_dereference(priv->peer);
iflink = peer ? peer->ifindex : 0;
rcu_read_unlock();
return iflink;
}
static netdev_features_t veth_fix_features(struct net_device *dev,
netdev_features_t features)
{
struct veth_priv *priv = netdev_priv(dev);
struct net_device *peer;
peer = rtnl_dereference(priv->peer);
if (peer) {
struct veth_priv *peer_priv = netdev_priv(peer);
if (peer_priv->_xdp_prog)
features &= ~NETIF_F_GSO_SOFTWARE;
}
return features;
}
static void veth_set_rx_headroom(struct net_device *dev, int new_hr)
{
struct veth_priv *peer_priv, *priv = netdev_priv(dev);
struct net_device *peer;
if (new_hr < 0)
new_hr = 0;
rcu_read_lock();
peer = rcu_dereference(priv->peer);
if (unlikely(!peer))
goto out;
peer_priv = netdev_priv(peer);
priv->requested_headroom = new_hr;
new_hr = max(priv->requested_headroom, peer_priv->requested_headroom);
dev->needed_headroom = new_hr;
peer->needed_headroom = new_hr;
out:
rcu_read_unlock();
}
static int veth_xdp_set(struct net_device *dev, struct bpf_prog *prog,
struct netlink_ext_ack *extack)
{
struct veth_priv *priv = netdev_priv(dev);
struct bpf_prog *old_prog;
struct net_device *peer;
unsigned int max_mtu;
int err;
old_prog = priv->_xdp_prog;
priv->_xdp_prog = prog;
peer = rtnl_dereference(priv->peer);
if (prog) {
if (!peer) {
NL_SET_ERR_MSG_MOD(extack, "Cannot set XDP when peer is detached");
err = -ENOTCONN;
goto err;
}
max_mtu = PAGE_SIZE - VETH_XDP_HEADROOM -
peer->hard_header_len -
SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
if (peer->mtu > max_mtu) {
NL_SET_ERR_MSG_MOD(extack, "Peer MTU is too large to set XDP");
err = -ERANGE;
goto err;
}
if (dev->flags & IFF_UP) {
err = veth_enable_xdp(dev);
if (err) {
NL_SET_ERR_MSG_MOD(extack, "Setup for XDP failed");
goto err;
}
}
if (!old_prog) {
peer->hw_features &= ~NETIF_F_GSO_SOFTWARE;
peer->max_mtu = max_mtu;
}
}
if (old_prog) {
if (!prog) {
if (dev->flags & IFF_UP)
veth_disable_xdp(dev);
if (peer) {
peer->hw_features |= NETIF_F_GSO_SOFTWARE;
peer->max_mtu = ETH_MAX_MTU;
}
}
bpf_prog_put(old_prog);
}
if ((!!old_prog ^ !!prog) && peer)
netdev_update_features(peer);
return 0;
err:
priv->_xdp_prog = old_prog;
return err;
}
static u32 veth_xdp_query(struct net_device *dev)
{
struct veth_priv *priv = netdev_priv(dev);
const struct bpf_prog *xdp_prog;
xdp_prog = priv->_xdp_prog;
if (xdp_prog)
return xdp_prog->aux->id;
return 0;
}
static int veth_xdp(struct net_device *dev, struct netdev_bpf *xdp)
{
switch (xdp->command) {
case XDP_SETUP_PROG:
return veth_xdp_set(dev, xdp->prog, xdp->extack);
case XDP_QUERY_PROG:
xdp->prog_id = veth_xdp_query(dev);
return 0;
default:
return -EINVAL;
}
}
static const struct net_device_ops veth_netdev_ops = {
.ndo_init = veth_dev_init,
.ndo_open = veth_open,
.ndo_stop = veth_close,
.ndo_start_xmit = veth_xmit,
.ndo_get_stats64 = veth_get_stats64,
.ndo_set_rx_mode = veth_set_multicast_list,
.ndo_set_mac_address = eth_mac_addr,
#ifdef CONFIG_NET_POLL_CONTROLLER
.ndo_poll_controller = veth_poll_controller,
#endif
.ndo_get_iflink = veth_get_iflink,
.ndo_fix_features = veth_fix_features,
.ndo_features_check = passthru_features_check,
.ndo_set_rx_headroom = veth_set_rx_headroom,
.ndo_bpf = veth_xdp,
};
#define VETH_FEATURES (NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_HW_CSUM | \
NETIF_F_RXCSUM | NETIF_F_SCTP_CRC | NETIF_F_HIGHDMA | \
NETIF_F_GSO_SOFTWARE | NETIF_F_GSO_ENCAP_ALL | \
NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_CTAG_RX | \
NETIF_F_HW_VLAN_STAG_TX | NETIF_F_HW_VLAN_STAG_RX )
static void veth_setup(struct net_device *dev)
{
ether_setup(dev);
dev->priv_flags &= ~IFF_TX_SKB_SHARING;
dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
dev->priv_flags |= IFF_NO_QUEUE;
dev->priv_flags |= IFF_PHONY_HEADROOM;
dev->netdev_ops = &veth_netdev_ops;
dev->ethtool_ops = &veth_ethtool_ops;
dev->features |= NETIF_F_LLTX;
dev->features |= VETH_FEATURES;
dev->vlan_features = dev->features &
~(NETIF_F_HW_VLAN_CTAG_TX |
NETIF_F_HW_VLAN_STAG_TX |
NETIF_F_HW_VLAN_CTAG_RX |
NETIF_F_HW_VLAN_STAG_RX);
dev->needs_free_netdev = true;
dev->priv_destructor = veth_dev_free;
dev->max_mtu = ETH_MAX_MTU;
dev->hw_features = VETH_FEATURES;
dev->hw_enc_features = VETH_FEATURES;
dev->mpls_features = NETIF_F_HW_CSUM | NETIF_F_GSO_SOFTWARE;
}
/*
* netlink interface
*/
static int veth_validate(struct nlattr *tb[], struct nlattr *data[],
struct netlink_ext_ack *extack)
{
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 (tb[IFLA_MTU]) {
if (!is_valid_veth_mtu(nla_get_u32(tb[IFLA_MTU])))
return -EINVAL;
}
return 0;
}
static struct rtnl_link_ops veth_link_ops;
static int veth_newlink(struct net *src_net, struct net_device *dev,
struct nlattr *tb[], struct nlattr *data[],
struct netlink_ext_ack *extack)
{
int err;
struct net_device *peer;
struct veth_priv *priv;
char ifname[IFNAMSIZ];
struct nlattr *peer_tb[IFLA_MAX + 1], **tbp;
unsigned char name_assign_type;
struct ifinfomsg *ifmp;
struct net *net;
/*
* create and register peer first
*/
if (data != NULL && data[VETH_INFO_PEER] != NULL) {
struct nlattr *nla_peer;
nla_peer = data[VETH_INFO_PEER];
ifmp = nla_data(nla_peer);
err = rtnl_nla_parse_ifla(peer_tb,
nla_data(nla_peer) + sizeof(struct ifinfomsg),
nla_len(nla_peer) - sizeof(struct ifinfomsg),
NULL);
if (err < 0)
return err;
err = veth_validate(peer_tb, NULL, extack);
if (err < 0)
return err;
tbp = peer_tb;
} else {
ifmp = NULL;
tbp = tb;
}
if (ifmp && tbp[IFLA_IFNAME]) {
nla_strlcpy(ifname, tbp[IFLA_IFNAME], IFNAMSIZ);
name_assign_type = NET_NAME_USER;
} else {
snprintf(ifname, IFNAMSIZ, DRV_NAME "%%d");
name_assign_type = NET_NAME_ENUM;
}
net = rtnl_link_get_net(src_net, tbp);
if (IS_ERR(net))
return PTR_ERR(net);
peer = rtnl_create_link(net, ifname, name_assign_type,
&veth_link_ops, tbp);
if (IS_ERR(peer)) {
put_net(net);
return PTR_ERR(peer);
}
if (!ifmp || !tbp[IFLA_ADDRESS])
eth_hw_addr_random(peer);
if (ifmp && (dev->ifindex != 0))
peer->ifindex = ifmp->ifi_index;
peer->gso_max_size = dev->gso_max_size;
peer->gso_max_segs = dev->gso_max_segs;
err = register_netdevice(peer);
put_net(net);
net = NULL;
if (err < 0)
goto err_register_peer;
netif_carrier_off(peer);
err = rtnl_configure_link(peer, ifmp);
if (err < 0)
goto err_configure_peer;
/*
* register dev last
*
* note, that since we've registered new device the dev's name
* should be re-allocated
*/
if (tb[IFLA_ADDRESS] == NULL)
eth_hw_addr_random(dev);
if (tb[IFLA_IFNAME])
nla_strlcpy(dev->name, tb[IFLA_IFNAME], IFNAMSIZ);
else
snprintf(dev->name, IFNAMSIZ, DRV_NAME "%%d");
err = register_netdevice(dev);
if (err < 0)
goto err_register_dev;
netif_carrier_off(dev);
/*
* tie the deviced together
*/
priv = netdev_priv(dev);
priv->dev = dev;
rcu_assign_pointer(priv->peer, peer);
priv = netdev_priv(peer);
priv->dev = peer;
rcu_assign_pointer(priv->peer, dev);
return 0;
err_register_dev:
/* nothing to do */
err_configure_peer:
unregister_netdevice(peer);
return err;
err_register_peer:
free_netdev(peer);
return err;
}
static void veth_dellink(struct net_device *dev, struct list_head *head)
{
struct veth_priv *priv;
struct net_device *peer;
priv = netdev_priv(dev);
peer = rtnl_dereference(priv->peer);
/* Note : dellink() is called from default_device_exit_batch(),
* before a rcu_synchronize() point. The devices are guaranteed
* not being freed before one RCU grace period.
*/
RCU_INIT_POINTER(priv->peer, NULL);
unregister_netdevice_queue(dev, head);
if (peer) {
priv = netdev_priv(peer);
RCU_INIT_POINTER(priv->peer, NULL);
unregister_netdevice_queue(peer, head);
}
}
static const struct nla_policy veth_policy[VETH_INFO_MAX + 1] = {
[VETH_INFO_PEER] = { .len = sizeof(struct ifinfomsg) },
};
static struct net *veth_get_link_net(const struct net_device *dev)
{
struct veth_priv *priv = netdev_priv(dev);
struct net_device *peer = rtnl_dereference(priv->peer);
return peer ? dev_net(peer) : dev_net(dev);
}
static struct rtnl_link_ops veth_link_ops = {
.kind = DRV_NAME,
.priv_size = sizeof(struct veth_priv),
.setup = veth_setup,
.validate = veth_validate,
.newlink = veth_newlink,
.dellink = veth_dellink,
.policy = veth_policy,
.maxtype = VETH_INFO_MAX,
.get_link_net = veth_get_link_net,
};
/*
* init/fini
*/
static __init int veth_init(void)
{
return rtnl_link_register(&veth_link_ops);
}
static __exit void veth_exit(void)
{
rtnl_link_unregister(&veth_link_ops);
}
module_init(veth_init);
module_exit(veth_exit);
MODULE_DESCRIPTION("Virtual Ethernet Tunnel");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS_RTNL_LINK(DRV_NAME);
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