[PATCH 2/8] netfilter: bridge: add nf_afinfo to enable queuing to userspace

[Pablo Neira Ayuso]

From: Stephane Bryant <stephane.ml.bry...@gmail.com>

This just adds and registers a nf_afinfo for the ethernet
bridge, which enables queuing to userspace for the AF_BRIDGE
family. No checksum computation is done.

Signed-off-by: Stephane Bryant <stephane.ml.bry...@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pa...@netfilter.org>
---
 net/bridge/netfilter/nf_tables_bridge.c | 47 +++++++++++++++++++++++++++++++--
 1 file changed, 45 insertions(+), 2 deletions(-)

diff --git a/net/bridge/netfilter/nf_tables_bridge.c 
b/net/bridge/netfilter/nf_tables_bridge.c
index 7fcdd72..a78c4e2 100644
--- a/net/bridge/netfilter/nf_tables_bridge.c
+++ b/net/bridge/netfilter/nf_tables_bridge.c
@@ -162,15 +162,57 @@ static const struct nf_chain_type filter_bridge = {
                          (1 << NF_BR_POST_ROUTING),
 };
 
+static void nf_br_saveroute(const struct sk_buff *skb,
+                           struct nf_queue_entry *entry)
+{
+}
+
+static int nf_br_reroute(struct net *net, struct sk_buff *skb,
+                        const struct nf_queue_entry *entry)
+{
+       return 0;
+}
+
+static __sum16 nf_br_checksum(struct sk_buff *skb, unsigned int hook,
+                             unsigned int dataoff, u_int8_t protocol)
+{
+       return 0;
+}
+
+static __sum16 nf_br_checksum_partial(struct sk_buff *skb, unsigned int hook,
+                                     unsigned int dataoff, unsigned int len,
+                                     u_int8_t protocol)
+{
+       return 0;
+}
+
+static int nf_br_route(struct net *net, struct dst_entry **dst,
+                      struct flowi *fl, bool strict __always_unused)
+{
+       return 0;
+}
+
+static const struct nf_afinfo nf_br_afinfo = {
+       .family                 = AF_BRIDGE,
+       .checksum               = nf_br_checksum,
+       .checksum_partial       = nf_br_checksum_partial,
+       .route                  = nf_br_route,
+       .saveroute              = nf_br_saveroute,
+       .reroute                = nf_br_reroute,
+       .route_key_size         = 0,
+};
+
 static int __init nf_tables_bridge_init(void)
 {
        int ret;
 
+       nf_register_afinfo(&nf_br_afinfo);
        nft_register_chain_type(&filter_bridge);
        ret = register_pernet_subsys(&nf_tables_bridge_net_ops);
-       if (ret < 0)
+       if (ret < 0) {
                nft_unregister_chain_type(&filter_bridge);
-
+               nf_unregister_afinfo(&nf_br_afinfo);
+       }
        return ret;
 }
 
@@ -178,6 +220,7 @@ static void __exit nf_tables_bridge_exit(void)
 {
        unregister_pernet_subsys(&nf_tables_bridge_net_ops);
        nft_unregister_chain_type(&filter_bridge);
+       nf_unregister_afinfo(&nf_br_afinfo);
 }
 
 module_init(nf_tables_bridge_init);
-- 
2.1.4