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net: netdevice: Add operation ndo_sk_get_lower_dev

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ndo_sk_get_lower_dev returns the lower netdev that corresponds to
a given socket.
Additionally, we implement a helper netdev_sk_get_lowest_dev() to get
the lowest one in chain.

Signed-off-by: Tariq Toukan <tariqt@nvidia.com>
Reviewed-by: Boris Pismenny <borisp@nvidia.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Tariq Toukan
2021-01-17 16:59:42 +02:00
committed by Jakub Kicinski
parent 41fb4c1ba7
commit 719a402cf6
2 changed files with 37 additions and 0 deletions
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4
include/linux/netdevice.h
View File

@@ -1398,6 +1398,8 @@ struct net_device_ops {
struct net_device* (*ndo_get_xmit_slave)(struct net_device *dev, struct net_device* (*ndo_get_xmit_slave)(struct net_device *dev,
struct sk_buff *skb, struct sk_buff *skb,
bool all_slaves); bool all_slaves);
struct net_device* (*ndo_sk_get_lower_dev)(struct net_device *dev,
struct sock *sk);
netdev_features_t (*ndo_fix_features)(struct net_device *dev, netdev_features_t (*ndo_fix_features)(struct net_device *dev,
netdev_features_t features); netdev_features_t features);
int (*ndo_set_features)(struct net_device *dev, int (*ndo_set_features)(struct net_device *dev,
@@ -2858,6 +2860,8 @@ int init_dummy_netdev(struct net_device *dev);
struct net_device *netdev_get_xmit_slave(struct net_device *dev, struct net_device *netdev_get_xmit_slave(struct net_device *dev,
struct sk_buff *skb, struct sk_buff *skb,
bool all_slaves); bool all_slaves);
struct net_device *netdev_sk_get_lowest_dev(struct net_device *dev,
struct sock *sk);
struct net_device *dev_get_by_index(struct net *net, int ifindex); struct net_device *dev_get_by_index(struct net *net, int ifindex);
struct net_device *__dev_get_by_index(struct net *net, int ifindex); struct net_device *__dev_get_by_index(struct net *net, int ifindex);
struct net_device *dev_get_by_index_rcu(struct net *net, int ifindex); struct net_device *dev_get_by_index_rcu(struct net *net, int ifindex);

33
net/core/dev.c
View File

@@ -8105,6 +8105,39 @@ struct net_device *netdev_get_xmit_slave(struct net_device *dev,
} }
EXPORT_SYMBOL(netdev_get_xmit_slave); EXPORT_SYMBOL(netdev_get_xmit_slave);
static struct net_device *netdev_sk_get_lower_dev(struct net_device *dev,
struct sock *sk)
{
const struct net_device_ops *ops = dev->netdev_ops;
if (!ops->ndo_sk_get_lower_dev)
return NULL;
return ops->ndo_sk_get_lower_dev(dev, sk);
}
/**
* netdev_sk_get_lowest_dev - Get the lowest device in chain given device and socket
* @dev: device
* @sk: the socket
*
* %NULL is returned if no lower device is found.
*/
struct net_device *netdev_sk_get_lowest_dev(struct net_device *dev,
struct sock *sk)
{
struct net_device *lower;
lower = netdev_sk_get_lower_dev(dev, sk);
while (lower) {
dev = lower;
lower = netdev_sk_get_lower_dev(dev, sk);
}
return dev;
}
EXPORT_SYMBOL(netdev_sk_get_lowest_dev);
static void netdev_adjacent_add_links(struct net_device *dev) static void netdev_adjacent_add_links(struct net_device *dev)
{ {
struct netdev_adjacent *iter; struct netdev_adjacent *iter;