Add a new netdev op for drivers implementing the BPF_PROG_TYPE_PHYS_DEV
filter to get configuration. Since the fd is only used by the driver to
fetch the prog, the netdev should just keep a bit to indicate the
program is valid.
Signed-off-by: Brenden Blanco <bbla...@plumgrid.com>
---
include/linux/netdevice.h | 8 ++++++++
net/core/dev.c | 12 ++++++++++++
2 files changed, 20 insertions(+)
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index cb0d5d0..c46e2e3 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -1102,6 +1102,11 @@ struct tc_to_netdev {
* appropriate rx headroom value allows avoiding skb head copy on
* forward. Setting a negative value resets the rx headroom to the
* default value.
+ * int (*ndo_bpf_set)(struct net_device *dev, int fd);
+ * This function is used to set or clear a bpf program used in the
+ * earliest stages of packet rx. The fd must be a program loaded as
+ * BPF_PROG_TYPE_PHYS_DEV. Negative values of fd indicate the program
+ * should be removed.
*
*/
struct net_device_ops {
@@ -1292,6 +1297,7 @@ struct net_device_ops {
struct sk_buff *skb);
void (*ndo_set_rx_headroom)(struct net_device *dev,
int needed_headroom);
+ int (*ndo_bpf_set)(struct net_device *dev, int fd);
};
/**
@@ -1875,6 +1881,7 @@ struct net_device {
struct phy_device *phydev;
struct lock_class_key *qdisc_tx_busylock;
bool proto_down;
+ bool bpf_valid;
};
#define to_net_dev(d) container_of(d, struct net_device, dev)
@@ -3268,6 +3275,7 @@ int dev_get_phys_port_id(struct net_device *dev,
int dev_get_phys_port_name(struct net_device *dev,
char *name, size_t len);
int dev_change_proto_down(struct net_device *dev, bool proto_down);
+int dev_change_bpf_fd(struct net_device *dev, int fd);
struct sk_buff *validate_xmit_skb_list(struct sk_buff *skb, struct net_device
*dev);
struct sk_buff *dev_hard_start_xmit(struct sk_buff *skb, struct net_device
*dev,
struct netdev_queue *txq, int *ret);
diff --git a/net/core/dev.c b/net/core/dev.c
index b9bcbe7..eb93414 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -6480,6 +6480,18 @@ int dev_change_proto_down(struct net_device *dev, bool
proto_down)
}
EXPORT_SYMBOL(dev_change_proto_down);
+int dev_change_bpf_fd(struct net_device *dev, int fd)
+{
+ const struct net_device_ops *ops = dev->netdev_ops;
+
+ if (!ops->ndo_bpf_set)
+ return -EOPNOTSUPP;
+ if (!netif_device_present(dev))
+ return -ENODEV;
+ return ops->ndo_bpf_set(dev, fd);
+}
+EXPORT_SYMBOL(dev_change_bpf_fd);
+
/**
* dev_new_index - allocate an ifindex
* @net: the applicable net namespace
--
2.8.0
