ipv6: Stop /128 route from disappearing after pmtu update
This patch is mostly from Steffen Klassert <steffen.klassert@secunet.com>. I only removed the (rt6->rt6i_dst.plen == 128) check from ip6_rt_update_pmtu() because the (rt6->rt6i_flags & RTF_CACHE) test has already implied it. This patch: 1. Create RTF_CACHE route for /128 non local route 2. After (1), all routes that allow pmtu update should have a RTF_CACHE clone. Hence, stop updating MTU for any non RTF_CACHE route. Signed-off-by: Martin KaFai Lau <kafai@fb.com> Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com> Reviewed-by: Hannes Frederic Sowa <hannes@stressinduktion.org> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -977,7 +977,7 @@ redo_rt6_select:
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if (!(rt->rt6i_flags & (RTF_NONEXTHOP | RTF_GATEWAY)))
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nrt = rt6_alloc_cow(rt, &fl6->daddr, &fl6->saddr);
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else if (!(rt->dst.flags & DST_HOST))
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else if (!(rt->dst.flags & DST_HOST) || !(rt->dst.flags & RTF_LOCAL))
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nrt = rt6_alloc_clone(rt, &fl6->daddr);
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else
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goto out2;
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@ -1172,7 +1172,7 @@ static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
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struct rt6_info *rt6 = (struct rt6_info *)dst;
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dst_confirm(dst);
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if (mtu < dst_mtu(dst) && rt6->rt6i_dst.plen == 128) {
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if (mtu < dst_mtu(dst) && (rt6->rt6i_flags & RTF_CACHE)) {
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struct net *net = dev_net(dst->dev);
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rt6->rt6i_flags |= RTF_MODIFIED;
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