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ipv6: Extend the route lookups to low priority metrics. 

We search only for routes with highest priority metric in
find_rr_leaf(). However if one of these routes is marked
as invalid, we may fail to find a route even if there is
a appropriate route with lower priority. Then we loose
connectivity until the garbage collector deletes the
invalid route. This typically happens if a host route
expires afer a pmtu event. Fix this by searching also
for routes with a lower priority metric.

Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Reviewed-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Steffen Klassert 2015-04-28 13:03:04 -07:00 committed by David S. Miller
parent 1f56a01f4e
commit 9fbdcfaf97
1 changed files with 23 additions and 5 deletions
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28
net/ipv6/route.c
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@ -652,15 +652,33 @@ static struct rt6_info *find_rr_leaf(struct fib6_node *fn,
u32 metric, int oif, int strict,
bool *do_rr)
{
struct rt6_info *rt, *match;
struct rt6_info *rt, *match, *cont;
int mpri = -1;
match = NULL;
for (rt = rr_head; rt && rt->rt6i_metric == metric;
rt = rt->dst.rt6_next)
cont = NULL;
for (rt = rr_head; rt; rt = rt->dst.rt6_next) {
if (rt->rt6i_metric != metric) {
cont = rt;
break;
}
match = find_match(rt, oif, strict, &mpri, match, do_rr);
for (rt = fn->leaf; rt && rt != rr_head && rt->rt6i_metric == metric;
rt = rt->dst.rt6_next)
}
for (rt = fn->leaf; rt && rt != rr_head; rt = rt->dst.rt6_next) {
if (rt->rt6i_metric != metric) {
cont = rt;
break;
}
match = find_match(rt, oif, strict, &mpri, match, do_rr);
}
if (match || !cont)
return match;
for (rt = cont; rt; rt = rt->dst.rt6_next)
match = find_match(rt, oif, strict, &mpri, match, do_rr);
return match;