From 26d31925cd5ea4b5b168ed538b0326d63ccbb384 Mon Sep 17 00:00:00 2001 From: Nicolas Dichtel Date: Wed, 28 Nov 2018 19:12:56 +0100 Subject: tun: implement carrier change The userspace may need to control the carrier state. Signed-off-by: Nicolas Dichtel Signed-off-by: Didier Pallard Signed-off-by: David S. Miller --- drivers/net/tun.c | 27 ++++++++++++++++++++++++++- 1 file changed, 26 insertions(+), 1 deletion(-) (limited to 'drivers') diff --git a/drivers/net/tun.c b/drivers/net/tun.c index 56575f88d1fd..835c73f42ae7 100644 --- a/drivers/net/tun.c +++ b/drivers/net/tun.c @@ -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; -- cgit v1.2.3