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inet6_sk(sk)->ipv6_ac_list is protected by lock_sock(). In ipv6_sock_ac_join(), only __dev_get_by_index(), __dev_get_by_flags(), and __in6_dev_get() require RTNL. __dev_get_by_flags() is only used by ipv6_sock_ac_join() and can be converted to RCU version. Let's replace RCU version helper and drop RTNL from IPV6_JOIN_ANYCAST. setsockopt_needs_rtnl() will be removed in the next patch. Signed-off-by: Kuniyuki Iwashima <kuniyu@google.com> Reviewed-by: Eric Dumazet <edumazet@google.com> Link: https://patch.msgid.link/20250702230210.3115355-15-kuni1840@gmail.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>