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Commit 26d31925 authored by Nicolas Dichtel's avatar Nicolas Dichtel Committed by David S. Miller
Browse files

tun: implement carrier change 



The userspace may need to control the carrier state.

Signed-off-by: default avatarNicolas Dichtel <nicolas.dichtel@6wind.com>
Signed-off-by: default avatarDidier Pallard <didier.pallard@6wind.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent bf1c3ab8

drivers/net/tun.c

+26 −1
Original line number Diff line number Diff line
@@ -1254,6 +1254,21 @@ static int tun_xdp(struct net_device *dev, struct netdev_bpf *xdp) 
	}

}



static int tun_net_change_carrier(struct net_device *dev, bool new_carrier)

{

	if (new_carrier) {

		struct tun_struct *tun = netdev_priv(dev);



		if (!tun->numqueues)

			return -EPERM;



		netif_carrier_on(dev);

	} else {

		netif_carrier_off(dev);

	}

	return 0;

}



static const struct net_device_ops tun_netdev_ops = {

	.ndo_uninit		= tun_net_uninit,

	.ndo_open		= tun_net_open,
@@ -1263,6 +1278,7 @@ static const struct net_device_ops tun_netdev_ops = { 
	.ndo_select_queue	= tun_select_queue,

	.ndo_set_rx_headroom	= tun_set_headroom,

	.ndo_get_stats64	= tun_net_get_stats64,

	.ndo_change_carrier	= tun_net_change_carrier,

};



static void __tun_xdp_flush_tfile(struct tun_file *tfile)
@@ -1345,6 +1361,7 @@ static const struct net_device_ops tap_netdev_ops = { 
	.ndo_get_stats64	= tun_net_get_stats64,

	.ndo_bpf		= tun_xdp,

	.ndo_xdp_xmit		= tun_xdp_xmit,

	.ndo_change_carrier	= tun_net_change_carrier,

};



static void tun_flow_init(struct tun_struct *tun)
@@ -3002,12 +3019,12 @@ static long __tun_chr_ioctl(struct file *file, unsigned int cmd, 
	struct net *net = sock_net(&tfile->sk);

	struct tun_struct *tun;

	void __user* argp = (void __user*)arg;

	unsigned int ifindex, carrier;

	struct ifreq ifr;

	kuid_t owner;

	kgid_t group;

	int sndbuf;

	int vnet_hdr_sz;

	unsigned int ifindex;

	int le;

	int ret;

	bool do_notify = false;
@@ -3291,6 +3308,14 @@ static long __tun_chr_ioctl(struct file *file, unsigned int cmd, 
		ret = tun_set_ebpf(tun, &tun->filter_prog, argp);

		break;



	case TUNSETCARRIER:

		ret = -EFAULT;

		if (copy_from_user(&carrier, argp, sizeof(carrier)))

			goto unlock;



		ret = tun_net_change_carrier(tun->dev, (bool)carrier);

		break;



	default:

		ret = -EINVAL;

		break;

include/uapi/linux/if_tun.h

+1 −0
Original line number Diff line number Diff line
@@ -59,6 +59,7 @@ 
#define TUNGETVNETBE _IOR('T', 223, int)

#define TUNSETSTEERINGEBPF _IOR('T', 224, int)

#define TUNSETFILTEREBPF _IOR('T', 225, int)

#define TUNSETCARRIER _IOW('T', 226, int)



/* TUNSETIFF ifr flags */

#define IFF_TUN		0x0001