Subject: [PATCH 15/15] netfilter: nf_tables: force module load in case select_ops() returns -EAGAIN

From: Pablo Neira Ayuso <[email-masked]>
Date: Mon, 8 Jul 2019 12:32:37 +0200

nft_meta needs to pull in the nft_meta_bridge module in case that this
is a bridge family rule from the select_ops() path.

Signed-off-by: Pablo Neira Ayuso <[email-masked]>
---
 net/netfilter/nf_tables_api.c | 6 ++++++
 net/netfilter/nft_meta.c      | 4 ++++
 2 files changed, 10 insertions(+)

diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index 5e97bf64975a..d22d00ca78c1 100644
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -2144,6 +2144,12 @@ static int nf_tables_expr_parse(const struct nft_ctx *ctx,
 				       (const struct nlattr * const *)info->tb);
 		if (IS_ERR(ops)) {
 			err = PTR_ERR(ops);
+#ifdef CONFIG_MODULES
+			if (err == -EAGAIN)
+				nft_expr_type_request_module(ctx->net,
+							     ctx->family,
+							     tb[NFTA_EXPR_NAME]);
+#endif
 			goto err1;
 		}
 	} else
diff --git a/net/netfilter/nft_meta.c b/net/netfilter/nft_meta.c
index 18a848b01759..417f8d32e9a3 100644
--- a/net/netfilter/nft_meta.c
+++ b/net/netfilter/nft_meta.c
@@ -519,6 +519,10 @@ nft_meta_select_ops(const struct nft_ctx *ctx,
 	if (tb[NFTA_META_DREG] && tb[NFTA_META_SREG])
 		return ERR_PTR(-EINVAL);
 
+#ifdef CONFIG_NF_TABLES_BRIDGE
+	if (ctx->family == NFPROTO_BRIDGE)
+		return ERR_PTR(-EAGAIN);
+#endif
 	if (tb[NFTA_META_DREG])
 		return &nft_meta_get_ops;
 
-- 
2.11.0