netkit: no longer rely on RTNL in netkit_fill_info()

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netkit_fill_info() used rtnl_dereference() to fetch nk->peer,
and thus required RTNL.

nk->peer is already an RCU protected pointer, updated with
rcu_assign_pointer() and read from the fast path with
rcu_dereference(). Simply use rcu_dereference() under
rcu_read_lock() instead.

While at it, use READ_ONCE() when reading nk->policy, because
netkit_change_link() can change it at any time (it already uses
WRITE_ONCE()).

Other fields (primary, mode, pair, scrub) are only set from
netkit_new_link(), before the device is visible to dumps.

Also add missing const qualifiers.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Nikolay Aleksandrov <razor@blackwall.org>
Link: https://patch.msgid.link/20260916111953.1611574-1-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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Eric Dumazet 2026-09-16 11:19:53 +00:00 • committed by Jakub Kicinski

parent 8050e0efd4

commit aea70e81be

1 changed files with 11 additions and 6 deletions

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17

drivers/net/netkit.c

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