On 2/19/21 9:32 PM, Yejune Deng wrote:
> static const struct neigh_ops arp_direct_ops = {
> .family = AF_INET,
> .output = neigh_direct_output,
> @@ -277,15 +269,10 @@ static int arp_constructor(struct neighbour *neigh)
> memcpy(neigh->ha, dev->broadcast, dev->addr_len);
> }
>
> - if (dev->header_ops->cache)
> - neigh->ops = &arp_hh_ops;
> - else
> - neigh->ops = &arp_generic_ops;
How did you test this?
you took out the neigh->ops assignment, so all of the neigh->ops in
net/core/neighbour.c are going to cause a NULL dereference.
> -
> - if (neigh->nud_state & NUD_VALID)
> - neigh->output = neigh->ops->connected_output;
> + if (!dev->header_ops->cache && (neigh->nud_state & NUD_VALID))
> + neigh->output = arp_generic_ops.connected_output;
> else
> - neigh->output = neigh->ops->output;
> + neigh->output = arp_generic_ops.output;
> }
> return 0;
> }
>
