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ipv6: add support of equal cost multipath (ECMP)
Each nexthop is added like a single route in the routing table. All routes that have the same metric/weight and destination but not the same gateway are considering as ECMP routes. They are linked together, through a list called rt6i_siblings. ECMP routes can be added in one shot, with RTA_MULTIPATH attribute or one after the other (in both case, the flag NLM_F_EXCL should not be set). The patch is based on a previous work from Luc Saillard <luc.saillard@6wind.com>. Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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