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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>
zero-colors
Sabrina Dubroca 2018-02-16 11:03:07 +01:00 committed by David S. Miller
parent 1cbec07649
commit 1ec010e705
2 changed files with 74 additions and 0 deletions
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56
drivers/net/tun.c
View File

@ -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)

18
include/uapi/linux/if_link.h
View File

@ -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 */