Re: [PATCH 05/11 net-next v4] ipv6: prepare headers for ipv6_stub removal

[Fernando Fernandez Mancera]

On 3/24/26 9:22 AM, Ido Schimmel wrote:
> On Fri, Mar 20, 2026 at 07:55:57PM +0100, Fernando Fernandez Mancera wrote:
> > +#if IS_ENABLED(CONFIG_IPV6)
> >   int ip6_fragment(struct net *net, struct sock *sk, struct sk_buff *skb,
> >   		 int (*output)(struct net *, struct sock *, struct sk_buff *));
> > +#else
> > +static inline int ip6_fragment(struct net *net, struct sock *sk,
> > +			       struct sk_buff *skb,
> > +			       int (*output)(struct net *, struct sock *,
> > +					     struct sk_buff *))
> > +{
> > +	kfree_skb(skb);
> > +	return -EAFNOSUPPORT;
> > +}
> > +#endif
>
> [...]
>
> > diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c
> > index 8e2a6b28cea7..79f7ee93ceff 100644
> > --- a/net/ipv6/ip6_output.c
> > +++ b/net/ipv6/ip6_output.c
> > @@ -873,6 +873,8 @@ int ip6_fragment(struct net *net, struct sock *sk, struct sk_buff *skb,
> >   	__be32 frag_id;
> >   	u8 *prevhdr, nexthdr = 0;
> >   
> > +	if (!ipv6_mod_enabled())
> > +		return -EAFNOSUPPORT;
>
> Free the skb?

Ah right. Makes sense, thanks!

> >   	err = ip6_find_1stfragopt(skb, &prevhdr);
> >   	if (err < 0)
> >   		goto fail;
> > @@ -1045,6 +1047,7 @@ int ip6_fragment(struct net *net, struct sock *sk, struct sk_buff *skb,
> >   	kfree_skb(skb);
> >   	return err;
> >   }
> > +EXPORT_SYMBOL_GPL(ip6_fragment);