On Sun, Oct 20, 2013 at 03:43:02PM +0300, Julian Anastasov wrote:
> The second patch is an optimization that makes sure
> all resulting routes have rt6i_gateway filled, so that we
> can avoid the complex ipv6_addr_any() call added to rt6_nexthop()
> by patch 1. And it sets rt6i_gateway for local routes, a case
> not handled by patch 1.
Not related to the patch:
That reminds me that Yoshifuji had the idea to cache the results for
ipv6_addr_type in IP6CB to avoid calling this function over and over again.
Maybe we can do the same for rt6_infos to save some cycles here and there.
Also, what do you think about this site:
net/ipv6/ip6_output.c:
411
412 rt = (struct rt6_info *) dst;
413 if (rt->rt6i_flags & RTF_GATEWAY)
414 target = &rt->rt6i_gateway;
415 else
416 target = &hdr->daddr;
417
Our provided skb_dst should come from ip6_route_input, thus ip6_pol_route. So
I assume we have rt6i_gateway == hdr->daddr there, too. It is a bit more
complicated because of possible routing extension headers. Maybe you already
looked at this already?
I just found it while searching which other code paths do emit packets
while xt_TEE is processing (generation of redirects) and could also lead
to stack exhaustion. But the path in ip6_forward seems fine.
Greetings,
Hannes
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