ipv6: anycast: Don't hold RTNL for IPV6_JOIN_ANYCAST.

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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>

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This commit is contained in:

Kuniyuki Iwashima 2025-07-02 16:01:31 -07:00 • committed by Jakub Kicinski

parent 976fa9b205

commit eb1ac9ff6c

4 changed files with 34 additions and 34 deletions

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4

include/linux/netdevice.h

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38

net/core/dev.c

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22

net/ipv6/anycast.c

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4

net/ipv6/ipv6_sockglue.c

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