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xdp: add bpf_redirect helper function

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This adds support for a bpf_redirect helper function to the XDP
infrastructure. For now this only supports redirecting to the egress
path of a port.

In order to support drivers handling a xdp_buff natively this patches
uses a new ndo operation ndo_xdp_xmit() that takes pushes a xdp_buff
to the specified device.

If the program specifies either (a) an unknown device or (b) a device
that does not support the operation a BPF warning is thrown and the
XDP_ABORTED error code is returned.

Signed-off-by: John Fastabend <john.fastabend@gmail.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Jesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
John Fastabend 2017-07-17 09:27:07 -07:00 • committed by David S. Miller
parent d445516966
commit 814abfabef
4 changed files with 63 additions and 0 deletions
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6
include/linux/netdevice.h
View file

@ -66,6 +66,7 @@ struct mpls_dev;
/* UDP Tunnel offloads */
struct udp_tunnel_info;
struct bpf_prog;
struct xdp_buff;
void netdev_set_default_ethtool_ops(struct net_device *dev,
const struct ethtool_ops *ops);
@ -1138,6 +1139,9 @@ struct xfrmdev_ops {
* int (*ndo_xdp)(struct net_device *dev, struct netdev_xdp *xdp);
* This function is used to set or query state related to XDP on the
* netdevice. See definition of enum xdp_netdev_command for details.
* int (*ndo_xdp_xmit)(struct net_device *dev, struct xdp_buff *xdp);
* This function is used to submit a XDP packet for transmit on a
* netdevice.
*
*/
struct net_device_ops {
@ -1323,6 +1327,8 @@ struct net_device_ops {
int needed_headroom);
int (*ndo_xdp)(struct net_device *dev,
struct netdev_xdp *xdp);
int (*ndo_xdp_xmit)(struct net_device *dev,
struct xdp_buff *xdp);
};
/**