sit: convert 6RD configuration to RCU protection

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In order to allow lockless readers in future patches, convert
'tunnel->ip6rd' to an RCU protected pointer.

Updating 6RD configuration via ipip6_tunnel_update_6rd() or
ipip6_tunnel_clone_6rd() now allocates a struct ip_tunnel_6rd_parm and
uses rcu_assign_pointer() to publish it, freeing the previous
parameters with kfree_rcu().

Readers in check_6rd() and only_dnatted() use rcu_dereference() under
existing RCU read lock, preventing torn reads on the 128-bit IPv6
prefix.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Acked-by: Lorenzo Bianconi <lorenzo.bianconi@oss.qualcomm.com>
Link: https://patch.msgid.link/20260907075846.2913645-6-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

...

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Eric Dumazet 2026-09-07 07:58:42 +00:00 • committed by Jakub Kicinski

parent b5e8eadb1c

commit eaa2098a94

2 changed files with 117 additions and 46 deletions

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3

include/net/ip_tunnels.h

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160

net/ipv6/sit.c

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