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   1 From: Pablo Neira Ayuso <pablo@netfilter.org>
   2 Date: Wed, 24 Mar 2021 02:30:34 +0100
   3 Subject: [PATCH] net: bridge: resolve forwarding path for bridge devices
   4
   5 Add .ndo_fill_forward_path for bridge devices.
   6
   7 Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
   8 ---
   9
  10 --- a/include/linux/netdevice.h
  11 +++ b/include/linux/netdevice.h
  12 @@ -844,6 +844,7 @@ typedef u16 (*select_queue_fallback_t)(s
  13  enum net_device_path_type {
  14         DEV_PATH_ETHERNET = 0,
  15         DEV_PATH_VLAN,
  16 +       DEV_PATH_BRIDGE,
  17  };
  18
  19  struct net_device_path {
  20 --- a/net/bridge/br_device.c
  21 +++ b/net/bridge/br_device.c
  22 @@ -398,6 +398,32 @@ static int br_del_slave(struct net_devic
  23         return br_del_if(br, slave_dev);
  24  }
  25
  26 +static int br_fill_forward_path(struct net_device_path_ctx *ctx,
  27 +                               struct net_device_path *path)
  28 +{
  29 +       struct net_bridge_fdb_entry *f;
  30 +       struct net_bridge_port *dst;
  31 +       struct net_bridge *br;
  32 +
  33 +       if (netif_is_bridge_port(ctx->dev))
  34 +               return -1;
  35 +
  36 +       br = netdev_priv(ctx->dev);
  37 +       f = br_fdb_find_rcu(br, ctx->daddr, 0);
  38 +       if (!f || !f->dst)
  39 +               return -1;
  40 +
  41 +       dst = READ_ONCE(f->dst);
  42 +       if (!dst)
  43 +               return -1;
  44 +
  45 +       path->type = DEV_PATH_BRIDGE;
  46 +       path->dev = dst->br->dev;
  47 +       ctx->dev = dst->dev;
  48 +
  49 +       return 0;
  50 +}
  51 +
  52  static const struct ethtool_ops br_ethtool_ops = {
  53         .get_drvinfo             = br_getinfo,
  54         .get_link                = ethtool_op_get_link,
  55 @@ -432,6 +458,7 @@ static const struct net_device_ops br_ne
  56         .ndo_bridge_setlink      = br_setlink,
  57         .ndo_bridge_dellink      = br_dellink,
  58         .ndo_features_check      = passthru_features_check,
  59 +       .ndo_fill_forward_path   = br_fill_forward_path,
  60  };
  61
  62  static struct device_type br_type = {