Commit e4a2a304 authored by Jason Wang's avatar Jason Wang Committed by David S. Miller
Browse files

net: sock: introduce SOCK_XDP

This patch introduces a new sock flag - SOCK_XDP. This will be used
for notifying the upper layer that XDP program is attached on the
lower socket, and requires for extra headroom.

TUN will be the first user.
Signed-off-by: default avatarJason Wang <>
Signed-off-by: default avatarDavid S. Miller <>
parent 9708d2b5
......@@ -869,6 +869,9 @@ static int tun_attach(struct tun_struct *tun, struct file *file,
tun_napi_init(tun, tfile, napi);
if (rtnl_dereference(tun->xdp_prog))
sock_set_flag(&tfile->sk, SOCK_XDP);
/* device is allowed to go away first, so no need to hold extra
......@@ -1241,13 +1244,29 @@ static int tun_xdp_set(struct net_device *dev, struct bpf_prog *prog,
struct netlink_ext_ack *extack)
struct tun_struct *tun = netdev_priv(dev);
struct tun_file *tfile;
struct bpf_prog *old_prog;
int i;
old_prog = rtnl_dereference(tun->xdp_prog);
rcu_assign_pointer(tun->xdp_prog, prog);
if (old_prog)
for (i = 0; i < tun->numqueues; i++) {
tfile = rtnl_dereference(tun->tfiles[i]);
if (prog)
sock_set_flag(&tfile->sk, SOCK_XDP);
sock_reset_flag(&tfile->sk, SOCK_XDP);
list_for_each_entry(tfile, &tun->disabled, next) {
if (prog)
sock_set_flag(&tfile->sk, SOCK_XDP);
sock_reset_flag(&tfile->sk, SOCK_XDP);
return 0;
......@@ -800,6 +800,7 @@ enum sock_flags {
SOCK_SELECT_ERR_QUEUE, /* Wake select on error queue */
SOCK_RCU_FREE, /* wait rcu grace period in sk_destruct() */
SOCK_XDP, /* XDP is attached */
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