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xfrm: interface with if_id 0 should return error

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xfrm interface if_id = 0 would cause xfrm policy lookup errors since
Commit 9f8550e4bd.

Now explicitly fail to create an xfrm interface when if_id = 0

With this commit:
 ip link add ipsec0  type xfrm dev lo  if_id 0
 Error: if_id must be non zero.

v1->v2 change:
 - add Fixes: tag

Fixes: 9f8550e4bd ("xfrm: fix disable_xfrm sysctl when used on xfrm interfaces")
Signed-off-by: Antony Antony <antony.antony@secunet.com>
Reviewed-by: Eyal Birger <eyal.birger@gmail.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
This commit is contained in:
Antony Antony 2021-12-12 11:34:30 +01:00 committed by Steffen Klassert
parent 7770a39d7c
commit 8dce439195
1 changed files with 12 additions and 2 deletions
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14
net/xfrm/xfrm_interface.c
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@ -637,11 +637,16 @@ static int xfrmi_newlink(struct net *src_net, struct net_device *dev,
struct netlink_ext_ack *extack)
{
struct net *net = dev_net(dev);
struct xfrm_if_parms p;
struct xfrm_if_parms p = {};
struct xfrm_if *xi;
int err;
xfrmi_netlink_parms(data, &p);
if (!p.if_id) {
NL_SET_ERR_MSG(extack, "if_id must be non zero");
return -EINVAL;
}
xi = xfrmi_locate(net, &p);
if (xi)
return -EEXIST;
@ -666,7 +671,12 @@ static int xfrmi_changelink(struct net_device *dev, struct nlattr *tb[],
{
struct xfrm_if *xi = netdev_priv(dev);
struct net *net = xi->net;
struct xfrm_if_parms p;
struct xfrm_if_parms p = {};
if (!p.if_id) {
NL_SET_ERR_MSG(extack, "if_id must be non zero");
return -EINVAL;
}
xfrmi_netlink_parms(data, &p);
xi = xfrmi_locate(net, &p);