netfilter: flowtable: add tunnel encap/decap action offload support

This patch add tunnel encap decap action offload in the flowtable
offload.

Signed-off-by: wenxu <wenxu@ucloud.cn>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

diff --git a/net/netfilter/nf_flow_table_offload.c b/net/netfilter/nf_flow_table_offload.c
index 3101b35eac80a674abfcb4ef4221a35ff01c30cf..ad549317af30d553e6a5f4a50407359b5ddd4eb4 100644 (file)
--- a/net/netfilter/nf_flow_table_offload.c
+++ b/net/netfilter/nf_flow_table_offload.c
@@ -475,10 +475,52 @@ static void flow_offload_redirect(const struct flow_offload *flow,
        dev_hold(rt->dst.dev);
 }
 
+static void flow_offload_encap_tunnel(const struct flow_offload *flow,
+                                     enum flow_offload_tuple_dir dir,
+                                     struct nf_flow_rule *flow_rule)
+{
+       struct flow_action_entry *entry;
+       struct dst_entry *dst;
+
+       dst = flow->tuplehash[dir].tuple.dst_cache;
+       if (dst->lwtstate) {
+               struct ip_tunnel_info *tun_info;
+
+               tun_info = lwt_tun_info(dst->lwtstate);
+               if (tun_info && (tun_info->mode & IP_TUNNEL_INFO_TX)) {
+                       entry = flow_action_entry_next(flow_rule);
+                       entry->id = FLOW_ACTION_TUNNEL_ENCAP;
+                       entry->tunnel = tun_info;
+               }
+       }
+}
+
+static void flow_offload_decap_tunnel(const struct flow_offload *flow,
+                                     enum flow_offload_tuple_dir dir,
+                                     struct nf_flow_rule *flow_rule)
+{
+       struct flow_action_entry *entry;
+       struct dst_entry *dst;
+
+       dst = flow->tuplehash[!dir].tuple.dst_cache;
+       if (dst->lwtstate) {
+               struct ip_tunnel_info *tun_info;
+
+               tun_info = lwt_tun_info(dst->lwtstate);
+               if (tun_info && (tun_info->mode & IP_TUNNEL_INFO_TX)) {
+                       entry = flow_action_entry_next(flow_rule);
+                       entry->id = FLOW_ACTION_TUNNEL_DECAP;
+               }
+       }
+}
+
 int nf_flow_rule_route_ipv4(struct net *net, const struct flow_offload *flow,
                            enum flow_offload_tuple_dir dir,
                            struct nf_flow_rule *flow_rule)
 {
+       flow_offload_decap_tunnel(flow, dir, flow_rule);
+       flow_offload_encap_tunnel(flow, dir, flow_rule);
+
        if (flow_offload_eth_src(net, flow, dir, flow_rule) < 0 ||
            flow_offload_eth_dst(net, flow, dir, flow_rule) < 0)
                return -1;
@@ -505,6 +547,9 @@ int nf_flow_rule_route_ipv6(struct net *net, const struct flow_offload *flow,
                            enum flow_offload_tuple_dir dir,
                            struct nf_flow_rule *flow_rule)
 {
+       flow_offload_decap_tunnel(flow, dir, flow_rule);
+       flow_offload_encap_tunnel(flow, dir, flow_rule);
+
        if (flow_offload_eth_src(net, flow, dir, flow_rule) < 0 ||
            flow_offload_eth_dst(net, flow, dir, flow_rule) < 0)
                return -1;