netdev - Re: [PATCH v1 2/2] xfrm: Fix xfrm migrate issues when address family changes

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Date:   Tue, 18 Jan 2022 16:03:33 -0800
From:   Yan Yan <evitayan@...gle.com>
To:     Steffen Klassert <steffen.klassert@...unet.com>
Cc:     netdev@...r.kernel.org, Herbert Xu <herbert@...dor.apana.org.au>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Lorenzo Colitti <lorenzo@...gle.com>,
        Maciej Żenczykowski <maze@...gle.com>,
        nharold@...glel.com, benedictwong@...glel.com
Subject: Re: [PATCH v1 2/2] xfrm: Fix xfrm migrate issues when address family changes

Thanks Steffen, I will pull out xfrm_init_state() as you suggested.

On Tue, Jan 11, 2022 at 11:57 PM Steffen Klassert
<steffen.klassert@...unet.com> wrote:
>
> On Wed, Jan 05, 2022 at 04:52:51PM -0800, Yan Yan wrote:
>
> ...
>
> > -static struct xfrm_state *xfrm_state_clone(struct xfrm_state *orig,
> > -                                        struct xfrm_encap_tmpl *encap)
> > +static struct xfrm_state *xfrm_state_clone1(struct xfrm_state *orig,
> > +                                         struct xfrm_encap_tmpl *encap)
> >  {
> >       struct net *net = xs_net(orig);
> >       struct xfrm_state *x = xfrm_state_alloc(net);
> > @@ -1579,8 +1579,20 @@ static struct xfrm_state *xfrm_state_clone(struct xfrm_state *orig,
> >       memcpy(&x->mark, &orig->mark, sizeof(x->mark));
> >       memcpy(&x->props.smark, &orig->props.smark, sizeof(x->props.smark));
> >
> > -     if (xfrm_init_state(x) < 0)
> > -             goto error;
> > +     return x;
> > +
> > + error:
> > +     xfrm_state_put(x);
> > +out:
> > +     return NULL;
> > +}
> > +
> > +static int xfrm_state_clone2(struct xfrm_state *orig, struct xfrm_state *x)
>
> I'm not a frind of numbering function names, this just invites to
> create xfrm_state_clone3 :)
>
> > +{
> > +     int err = xfrm_init_state(x);
> > +
> > +     if (err < 0)
> > +             return err;
> >
> >       x->props.flags = orig->props.flags;
> >       x->props.extra_flags = orig->props.extra_flags;
> > @@ -1595,12 +1607,7 @@ static struct xfrm_state *xfrm_state_clone(struct xfrm_state *orig,
> >       x->replay = orig->replay;
> >       x->preplay = orig->preplay;
> >
> > -     return x;
> > -
> > - error:
> > -     xfrm_state_put(x);
> > -out:
> > -     return NULL;
> > +     return 0;
> >  }
> >
> >  struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net,
> > @@ -1661,10 +1668,14 @@ struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
> >  {
> >       struct xfrm_state *xc;
> >
> > -     xc = xfrm_state_clone(x, encap);
> > +     xc = xfrm_state_clone1(x, encap);
> >       if (!xc)
> >               return NULL;
> >
> > +     xc->props.family = m->new_family;
> > +     if (xfrm_state_clone2(x, xc) < 0)
> > +             goto error;
>
> xfrm_state_migrate() is the only function that calls xfrm_state_clone().
> Wouldn't it be better to move xfrm_init_state() out of xfrm_state_clone()
> and call it afterwards?
>
> This would also fix the replay window initialization on ESN because
> currently x->props.flags (which holds XFRM_STATE_ESN) is initialized
> after xfrm_init_state().
>


-- 
--
Best,
Yan