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authorSabrina Dubroca <sd@queasysnail.net>2018-02-16 13:03:07 +0300
committerDavid S. Miller <davem@davemloft.net>2018-02-17 00:58:22 +0300
commit1ec010e705934c8acbe7dbf31afc81e60e3d828b (patch)
tree6e97ec10c57a5bf05a12fda2a27c51eda186f63b /drivers/net/tun.c
parent1cbec07649ec8c267cdfb486ab4ee73949974ca4 (diff)
downloadlinux-1ec010e705934c8acbe7dbf31afc81e60e3d828b.tar.xz
tun: export flags, uid, gid, queue information over netlink
Signed-off-by: Sabrina Dubroca <sd@queasysnail.net> Reviewed-by: Stefano Brivio <sbrivio@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/tun.c')
-rw-r--r--drivers/net/tun.c56
1 files changed, 56 insertions, 0 deletions
diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index 8e9a0ac644d2..86b16013e9c5 100644
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -2291,11 +2291,67 @@ static int tun_validate(struct nlattr *tb[], struct nlattr *data[],
return -EINVAL;
}
+static size_t tun_get_size(const struct net_device *dev)
+{
+ BUILD_BUG_ON(sizeof(u32) != sizeof(uid_t));
+ BUILD_BUG_ON(sizeof(u32) != sizeof(gid_t));
+
+ return nla_total_size(sizeof(uid_t)) + /* OWNER */
+ nla_total_size(sizeof(gid_t)) + /* GROUP */
+ nla_total_size(sizeof(u8)) + /* TYPE */
+ nla_total_size(sizeof(u8)) + /* PI */
+ nla_total_size(sizeof(u8)) + /* VNET_HDR */
+ nla_total_size(sizeof(u8)) + /* PERSIST */
+ nla_total_size(sizeof(u8)) + /* MULTI_QUEUE */
+ nla_total_size(sizeof(u32)) + /* NUM_QUEUES */
+ nla_total_size(sizeof(u32)) + /* NUM_DISABLED_QUEUES */
+ 0;
+}
+
+static int tun_fill_info(struct sk_buff *skb, const struct net_device *dev)
+{
+ struct tun_struct *tun = netdev_priv(dev);
+
+ if (nla_put_u8(skb, IFLA_TUN_TYPE, tun->flags & TUN_TYPE_MASK))
+ goto nla_put_failure;
+ if (uid_valid(tun->owner) &&
+ nla_put_u32(skb, IFLA_TUN_OWNER,
+ from_kuid_munged(current_user_ns(), tun->owner)))
+ goto nla_put_failure;
+ if (gid_valid(tun->group) &&
+ nla_put_u32(skb, IFLA_TUN_GROUP,
+ from_kgid_munged(current_user_ns(), tun->group)))
+ goto nla_put_failure;
+ if (nla_put_u8(skb, IFLA_TUN_PI, !(tun->flags & IFF_NO_PI)))
+ goto nla_put_failure;
+ if (nla_put_u8(skb, IFLA_TUN_VNET_HDR, !!(tun->flags & IFF_VNET_HDR)))
+ goto nla_put_failure;
+ if (nla_put_u8(skb, IFLA_TUN_PERSIST, !!(tun->flags & IFF_PERSIST)))
+ goto nla_put_failure;
+ if (nla_put_u8(skb, IFLA_TUN_MULTI_QUEUE,
+ !!(tun->flags & IFF_MULTI_QUEUE)))
+ goto nla_put_failure;
+ if (tun->flags & IFF_MULTI_QUEUE) {
+ if (nla_put_u32(skb, IFLA_TUN_NUM_QUEUES, tun->numqueues))
+ goto nla_put_failure;
+ if (nla_put_u32(skb, IFLA_TUN_NUM_DISABLED_QUEUES,
+ tun->numdisabled))
+ goto nla_put_failure;
+ }
+
+ return 0;
+
+nla_put_failure:
+ return -EMSGSIZE;
+}
+
static struct rtnl_link_ops tun_link_ops __read_mostly = {
.kind = DRV_NAME,
.priv_size = sizeof(struct tun_struct),
.setup = tun_setup,
.validate = tun_validate,
+ .get_size = tun_get_size,
+ .fill_info = tun_fill_info,
};
static void tun_sock_write_space(struct sock *sk)