From 44e2b838c24d883dae8496dc7b6ddac7956ba53c Mon Sep 17 00:00:00 2001 From: Benedict Wong Date: Wed, 25 Jul 2018 13:45:29 -0700 Subject: xfrm: Return detailed errors from xfrmi_newlink Currently all failure modes of xfrm interface creation return EEXIST. This change improves the granularity of errnos provided by also returning ENODEV or EINVAL if failures happen in looking up the underlying interface, or a required parameter is not provided. This change has been tested against the Android Kernel Networking Tests, with additional xfrmi_newlink tests here: https://android-review.googlesource.com/c/kernel/tests/+/715755 Signed-off-by: Benedict Wong Signed-off-by: Steffen Klassert --- net/xfrm/xfrm_interface.c | 32 ++++++++++++++++++++------------ 1 file changed, 20 insertions(+), 12 deletions(-) (limited to 'net') diff --git a/net/xfrm/xfrm_interface.c b/net/xfrm/xfrm_interface.c index ccfe18d67e98..481d7307ab51 100644 --- a/net/xfrm/xfrm_interface.c +++ b/net/xfrm/xfrm_interface.c @@ -149,14 +149,18 @@ static struct xfrm_if *xfrmi_create(struct net *net, struct xfrm_if_parms *p) char name[IFNAMSIZ]; int err; - if (p->name[0]) + if (p->name[0]) { strlcpy(name, p->name, IFNAMSIZ); - else + } else { + err = -EINVAL; goto failed; + } dev = alloc_netdev(sizeof(*xi), name, NET_NAME_UNKNOWN, xfrmi_dev_setup); - if (!dev) + if (!dev) { + err = -EAGAIN; goto failed; + } dev_net_set(dev, net); @@ -165,8 +169,10 @@ static struct xfrm_if *xfrmi_create(struct net *net, struct xfrm_if_parms *p) xi->net = net; xi->dev = dev; xi->phydev = dev_get_by_index(net, p->link); - if (!xi->phydev) + if (!xi->phydev) { + err = -ENODEV; goto failed_free; + } err = xfrmi_create2(dev); if (err < 0) @@ -179,7 +185,7 @@ failed_dev_put: failed_free: free_netdev(dev); failed: - return NULL; + return ERR_PTR(err); } static struct xfrm_if *xfrmi_locate(struct net *net, struct xfrm_if_parms *p, @@ -194,13 +200,13 @@ static struct xfrm_if *xfrmi_locate(struct net *net, struct xfrm_if_parms *p, xip = &xi->next) { if (xi->p.if_id == p->if_id) { if (create) - return NULL; + return ERR_PTR(-EEXIST); return xi; } } if (!create) - return NULL; + return ERR_PTR(-ENODEV); return xfrmi_create(net, p); } @@ -682,8 +688,9 @@ static int xfrmi_newlink(struct net *src_net, struct net_device *dev, nla_strlcpy(p->name, tb[IFLA_IFNAME], IFNAMSIZ); - if (!xfrmi_locate(net, p, 1)) - return -EEXIST; + xi = xfrmi_locate(net, p, 1); + if (IS_ERR(xi)) + return PTR_ERR(xi); return 0; } @@ -704,11 +711,12 @@ static int xfrmi_changelink(struct net_device *dev, struct nlattr *tb[], xi = xfrmi_locate(net, &xi->p, 0); - if (xi) { + if (IS_ERR_OR_NULL(xi)) { + xi = netdev_priv(dev); + } else { if (xi->dev != dev) return -EEXIST; - } else - xi = netdev_priv(dev); + } return xfrmi_update(xi, &xi->p); } -- cgit v1.2.3