Commit 1ec010e7 authored by Sabrina Dubroca's avatar Sabrina Dubroca Committed by David S. Miller
Browse files

tun: export flags, uid, gid, queue information over netlink 



Signed-off-by: default avatarSabrina Dubroca <sd@queasysnail.net>
Reviewed-by: default avatarStefano Brivio <sbrivio@redhat.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 1cbec076

drivers/net/tun.c

+56 −0
Original line number Diff line number Diff line
@@ -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)

include/uapi/linux/if_link.h

+18 −0
Original line number Diff line number Diff line
@@ -941,4 +941,22 @@ enum { 
	IFLA_EVENT_BONDING_OPTIONS,	/* change in bonding options */

};



/* tun section */



enum {

	IFLA_TUN_UNSPEC,

	IFLA_TUN_OWNER,

	IFLA_TUN_GROUP,

	IFLA_TUN_TYPE,

	IFLA_TUN_PI,

	IFLA_TUN_VNET_HDR,

	IFLA_TUN_PERSIST,

	IFLA_TUN_MULTI_QUEUE,

	IFLA_TUN_NUM_QUEUES,

	IFLA_TUN_NUM_DISABLED_QUEUES,

	__IFLA_TUN_MAX,

};



#define IFLA_TUN_MAX (__IFLA_TUN_MAX - 1)



#endif /* _UAPI_LINUX_IF_LINK_H */