On Thu, 14 Jan 2021 13:57:13 -0800 Cong Wang wrote:
> On Thu, Jan 14, 2021 at 1:36 PM Jakub Kicinski <k...@kernel.org> wrote:
> >
> > On Thu, 14 Jan 2021 13:07:49 -0800 Cong Wang wrote:
> > > - if (msk_depth)
> > > - nla_opt_msk = nla_next(nla_opt_msk,
> > > &msk_depth);
> > > break;
> > > default:
> > > NL_SET_ERR_MSG(extack, "Unknown tunnel option
> > > type");
> > > return -EINVAL;
> > > }
> > > +
> > > + if (!nla_opt_msk)
> > > + continue;
> >
> > Why the switch from !msk_depth to !nla_opt_msk?
>
> It is the same, when nla_opt_msk is NULL, msk_depth is 0.
> Checking nla_opt_msk is NULL is more readable to express that
> mask is not provided.
>
> >
> > Seems like previously providing masks for only subset of options
> > would have worked.
>
> I don't think so, every type has this check:
>
> if (key->enc_opts.len != mask->enc_opts.len) {
> NL_SET_ERR_MSG(extack, "Key and mask
> miss aligned");
> return -EINVAL;
> }
>
> which guarantees the numbers are aligned.
>
> Thanks.
static int fl_set_vxlan_opt(const struct nlattr *nla, struct fl_flow_key *key,
int depth, int option_len,
struct netlink_ext_ack *extack)
{
struct nlattr *tb[TCA_FLOWER_KEY_ENC_OPT_VXLAN_MAX + 1];
struct vxlan_metadata *md;
int err;
md = (struct vxlan_metadata *)&key->enc_opts.data[key->enc_opts.len];
memset(md, 0xff, sizeof(*md));
if (!depth)
return sizeof(*md);
^^^^^^^^^^^^^^^^^^^
The mask is filled with all 1s if attribute is not provided.
