netfilter: nfnetlink_log: RCU conversion, part 2

- must use atomic_inc_not_zero() in instance_lookup_get()

- must use hlist_add_head_rcu() instead of hlist_add_head()

- must use hlist_del_rcu() instead of hlist_del()

- Introduce NFULNL_COPY_DISABLED to stop lockless reader from using an
instance, before we do final instance_put() on it.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: Patrick McHardy <kaber@trash.net>

1 files changed, 1 insertions, 0 deletions

diff --git a/include/linux/netfilter/nfnetlink_log.h b/include/linux/netfilter/nfnetlink_log.h
index d3bab7a2c9b7..1d0b84aa1d42 100644
--- a/include/linux/netfilter/nfnetlink_log.h
+++ b/include/linux/netfilter/nfnetlink_log.h
@@ -89,6 +89,7 @@ enum nfulnl_attr_config {
 #define NFULNL_COPY_NONE        0x00
 #define NFULNL_COPY_META        0x01
 #define NFULNL_COPY_PACKET      0x02
+#define NFULNL_COPY_DISABLED    0x03
 
 #define NFULNL_CFG_F_SEQ        0x0001
 #define NFULNL_CFG_F_SEQ_GLOBAL 0x0002