ip6mr: Convert ip6mr_rtm_getroute() to RCU.

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ip6mr_rtm_getroute() calls __ip6mr_get_table(), ip6mr_cache_find(),
and ip6mr_fill_mroute().

Once created, struct mr_table is not freed until netns dismantle,
so it's safe under RCU.

ip6mr_cache_find() iterates mrt->mfc_hash with rhl_for_each_entry_rcu().
struct mr_mfc is freed with call_rcu(), so this is also safe under
RCU.

ip6mr_fill_mroute() calls mr_fill_mroute(), which properly uses
RCU helpers.

Let's call them under RCU and register ip6mr_rtm_getroute() with
RTNL_FLAG_DOIT_UNLOCKED.

Signed-off-by: Kuniyuki Iwashima <kuniyu@google.com>
Link: https://patch.msgid.link/20260604224712.3209821-6-kuniyu@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

...

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Kuniyuki Iwashima 2026-06-04 22:46:23 +00:00 • committed by Jakub Kicinski

parent c2f5fd21ac

commit 76ea2ba229

1 changed files with 7 additions and 4 deletions

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net/ipv6/ip6mr.c

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