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Hi Team, Had a doubt regarding Optimistic DAD implementation in linux kernel. The RFC of Optimistic DAD states: “Section 3.3 A router SHOULD NOT configure an Optimistic Address.” To check the same there is a condition in kernel code wherein we check if ipv6.devconf_all is set. Now, my query is that we are checking if forwarding is enabled on all interfaces, then we consider the system to be a router. But even if forwarding is enabled from few interfaces(not all) isn’t the system behaving like a router? void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr, u32 flags) { .
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#ifdef CONFIG_IPV6_OPTIMISTIC_DAD if ((dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad || idev->cnf.optimistic_dad) && !dev_net(idev->dev)->ipv6.devconf_all->forwarding) cfg.ifa_flags |= IFA_F_OPTIMISTIC; #endif .
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} Thanks Chinmay |
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