diff mbox series

[net-next,07/18] netfilter: nft_inner: Use nested-BH locking for nft_pcpu_tun_ctx.

Message ID 20250309144653.825351-8-bigeasy@linutronix.de (mailing list archive)
State New
Delegated to: Netdev Maintainers
Headers show
Series net: Cover more per-CPU storage with local nested BH locking. | expand

Commit Message

Sebastian Andrzej Siewior March 9, 2025, 2:46 p.m. UTC 
nft_pcpu_tun_ctx is a per-CPU variable and relies on disabled BH for its
locking. Without per-CPU locking in local_bh_disable() on PREEMPT_RT
this data structure requires explicit locking.

Make a struct with a nft_inner_tun_ctx member (original
nft_pcpu_tun_ctx) and a local_lock_t and use local_lock_nested_bh() for
locking. This change adds only lockdep coverage and does not alter the
functional behaviour for !PREEMPT_RT.

Cc: Pablo Neira Ayuso <pablo@netfilter.org>
Cc: Jozsef Kadlecsik <kadlec@netfilter.org>
Cc: netfilter-devel@vger.kernel.org
Cc: coreteam@netfilter.org
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
 net/netfilter/nft_inner.c | 18 +++++++++++++++---
 1 file changed, 15 insertions(+), 3 deletions(-)
diff mbox series

Patch

diff --git a/net/netfilter/nft_inner.c b/net/netfilter/nft_inner.c
index 817ab978d24a1..c4569d4b92285 100644
--- a/net/netfilter/nft_inner.c
+++ b/net/netfilter/nft_inner.c
@@ -23,7 +23,14 @@ 
 #include <linux/ip.h>
 #include <linux/ipv6.h>
 
-static DEFINE_PER_CPU(struct nft_inner_tun_ctx, nft_pcpu_tun_ctx);
+struct nft_inner_tun_ctx_locked {
+	struct nft_inner_tun_ctx ctx;
+	local_lock_t bh_lock;
+};
+
+static DEFINE_PER_CPU(struct nft_inner_tun_ctx_locked, nft_pcpu_tun_ctx) = {
+	.bh_lock = INIT_LOCAL_LOCK(bh_lock),
+};
 
 /* Same layout as nft_expr but it embeds the private expression data area. */
 struct __nft_expr {
@@ -237,12 +244,15 @@  static bool nft_inner_restore_tun_ctx(const struct nft_pktinfo *pkt,
 	struct nft_inner_tun_ctx *this_cpu_tun_ctx;
 
 	local_bh_disable();
-	this_cpu_tun_ctx = this_cpu_ptr(&nft_pcpu_tun_ctx);
+	local_lock_nested_bh(&nft_pcpu_tun_ctx.bh_lock);
+	this_cpu_tun_ctx = this_cpu_ptr(&nft_pcpu_tun_ctx.ctx);
 	if (this_cpu_tun_ctx->cookie != (unsigned long)pkt->skb) {
 		local_bh_enable();
+		local_unlock_nested_bh(&nft_pcpu_tun_ctx.bh_lock);
 		return false;
 	}
 	*tun_ctx = *this_cpu_tun_ctx;
+	local_unlock_nested_bh(&nft_pcpu_tun_ctx.bh_lock);
 	local_bh_enable();
 
 	return true;
@@ -254,9 +264,11 @@  static void nft_inner_save_tun_ctx(const struct nft_pktinfo *pkt,
 	struct nft_inner_tun_ctx *this_cpu_tun_ctx;
 
 	local_bh_disable();
-	this_cpu_tun_ctx = this_cpu_ptr(&nft_pcpu_tun_ctx);
+	local_lock_nested_bh(&nft_pcpu_tun_ctx.bh_lock);
+	this_cpu_tun_ctx = this_cpu_ptr(&nft_pcpu_tun_ctx.ctx);
 	if (this_cpu_tun_ctx->cookie != tun_ctx->cookie)
 		*this_cpu_tun_ctx = *tun_ctx;
+	local_unlock_nested_bh(&nft_pcpu_tun_ctx.bh_lock);
 	local_bh_enable();
 }