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SubjectRe: [PATCH IPV6 1/1] ipv6: allocate enough headroom in ip6_finish_output2()
On Wed, 7 Jul 2021 08:45:13 -0600 David Ahern wrote:
> On 7/7/21 8:04 AM, Vasily Averin wrote:
> > diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c
> > index ff4f9eb..e5af740 100644
> > --- a/net/ipv6/ip6_output.c
> > +++ b/net/ipv6/ip6_output.c
> > @@ -61,9 +61,24 @@ static int ip6_finish_output2(struct net *net, struct sock *sk, struct sk_buff *
> > struct dst_entry *dst = skb_dst(skb);
> > struct net_device *dev = dst->dev;
> > const struct in6_addr *nexthop;
> > + unsigned int hh_len = LL_RESERVED_SPACE(dev);
> > struct neighbour *neigh;
> > int ret;
> >
> > + /* Be paranoid, rather than too clever. */
> > + if (unlikely(skb_headroom(skb) < hh_len && dev->header_ops)) {
> > + struct sk_buff *skb2;
> > +
> > + skb2 = skb_realloc_headroom(skb, LL_RESERVED_SPACE(dev));
>
> why not use hh_len here?

Is there a reason for the new skb? Why not pskb_expand_head()?

> > + if (!skb2) {
> > + kfree_skb(skb);
> > + return -ENOMEM;
> > + }
> > + if (skb->sk)
> > + skb_set_owner_w(skb2, skb->sk);
> > + consume_skb(skb);
> > + skb = skb2;
> > + }
> > if (ipv6_addr_is_multicast(&ipv6_hdr(skb)->daddr)) {
> > struct inet6_dev *idev = ip6_dst_idev(skb_dst(skb));


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