It overcomplicates things for no reason.
nft_meta_bridge only offers retrieval of bridge port interface name.

Because of this being its own module, we had to export all nft_meta
functions, which we can then make static again (which even reduces
the size of nft_meta -- including bridge port retrieval...):

before:
   text    data     bss     dec     hex filename
   1838     832       0    2670     a6e net/bridge/netfilter/nft_meta_bridge.ko
   6147     936       1    7084    1bac net/netfilter/nft_meta.ko

after:
   5826     936       1    6763    1a6b net/netfilter/nft_meta.ko

Signed-off-by: Florian Westphal <f...@strlen.de>
---
 include/net/netfilter/nft_meta.h       |  44 -----------
 net/bridge/netfilter/Kconfig           |   7 --
 net/bridge/netfilter/Makefile          |   1 -
 net/bridge/netfilter/nft_meta_bridge.c | 135 ---------------------------------
 net/netfilter/nft_meta.c               |  90 ++++++++++++++--------
 5 files changed, 58 insertions(+), 219 deletions(-)
 delete mode 100644 include/net/netfilter/nft_meta.h
 delete mode 100644 net/bridge/netfilter/nft_meta_bridge.c

diff --git a/include/net/netfilter/nft_meta.h b/include/net/netfilter/nft_meta.h
deleted file mode 100644
index 5c69e9b09388..000000000000
--- a/include/net/netfilter/nft_meta.h
+++ /dev/null
@@ -1,44 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef _NFT_META_H_
-#define _NFT_META_H_
-
-struct nft_meta {
-       enum nft_meta_keys      key:8;
-       union {
-               enum nft_registers      dreg:8;
-               enum nft_registers      sreg:8;
-       };
-};
-
-extern const struct nla_policy nft_meta_policy[];
-
-int nft_meta_get_init(const struct nft_ctx *ctx,
-                     const struct nft_expr *expr,
-                     const struct nlattr * const tb[]);
-
-int nft_meta_set_init(const struct nft_ctx *ctx,
-                     const struct nft_expr *expr,
-                     const struct nlattr * const tb[]);
-
-int nft_meta_get_dump(struct sk_buff *skb,
-                     const struct nft_expr *expr);
-
-int nft_meta_set_dump(struct sk_buff *skb,
-                     const struct nft_expr *expr);
-
-void nft_meta_get_eval(const struct nft_expr *expr,
-                      struct nft_regs *regs,
-                      const struct nft_pktinfo *pkt);
-
-void nft_meta_set_eval(const struct nft_expr *expr,
-                      struct nft_regs *regs,
-                      const struct nft_pktinfo *pkt);
-
-void nft_meta_set_destroy(const struct nft_ctx *ctx,
-                         const struct nft_expr *expr);
-
-int nft_meta_set_validate(const struct nft_ctx *ctx,
-                         const struct nft_expr *expr,
-                         const struct nft_data **data);
-
-#endif
diff --git a/net/bridge/netfilter/Kconfig b/net/bridge/netfilter/Kconfig
index f212447794bd..9a0159aebe1a 100644
--- a/net/bridge/netfilter/Kconfig
+++ b/net/bridge/netfilter/Kconfig
@@ -8,13 +8,6 @@ menuconfig NF_TABLES_BRIDGE
        bool "Ethernet Bridge nf_tables support"
 
 if NF_TABLES_BRIDGE
-
-config NFT_BRIDGE_META
-       tristate "Netfilter nf_table bridge meta support"
-       depends on NFT_META
-       help
-         Add support for bridge dedicated meta key.
-
 config NFT_BRIDGE_REJECT
        tristate "Netfilter nf_tables bridge reject support"
        depends on NFT_REJECT && NFT_REJECT_IPV4 && NFT_REJECT_IPV6
diff --git a/net/bridge/netfilter/Makefile b/net/bridge/netfilter/Makefile
index 4bc758dd4a8c..9b868861f21a 100644
--- a/net/bridge/netfilter/Makefile
+++ b/net/bridge/netfilter/Makefile
@@ -3,7 +3,6 @@
 # Makefile for the netfilter modules for Link Layer filtering on a bridge.
 #
 
-obj-$(CONFIG_NFT_BRIDGE_META)  += nft_meta_bridge.o
 obj-$(CONFIG_NFT_BRIDGE_REJECT)  += nft_reject_bridge.o
 
 # packet logging
diff --git a/net/bridge/netfilter/nft_meta_bridge.c 
b/net/bridge/netfilter/nft_meta_bridge.c
deleted file mode 100644
index bb63c9aed55d..000000000000
--- a/net/bridge/netfilter/nft_meta_bridge.c
+++ /dev/null
@@ -1,135 +0,0 @@
-/*
- * Copyright (c) 2014 Intel Corporation
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- */
-
-#include <linux/kernel.h>
-#include <linux/init.h>
-#include <linux/module.h>
-#include <linux/netlink.h>
-#include <linux/netfilter.h>
-#include <linux/netfilter/nf_tables.h>
-#include <net/netfilter/nf_tables.h>
-#include <net/netfilter/nft_meta.h>
-
-#include "../br_private.h"
-
-static void nft_meta_bridge_get_eval(const struct nft_expr *expr,
-                                    struct nft_regs *regs,
-                                    const struct nft_pktinfo *pkt)
-{
-       const struct nft_meta *priv = nft_expr_priv(expr);
-       const struct net_device *in = nft_in(pkt), *out = nft_out(pkt);
-       u32 *dest = &regs->data[priv->dreg];
-       const struct net_bridge_port *p;
-
-       switch (priv->key) {
-       case NFT_META_BRI_IIFNAME:
-               if (in == NULL || (p = br_port_get_rcu(in)) == NULL)
-                       goto err;
-               break;
-       case NFT_META_BRI_OIFNAME:
-               if (out == NULL || (p = br_port_get_rcu(out)) == NULL)
-                       goto err;
-               break;
-       default:
-               goto out;
-       }
-
-       strncpy((char *)dest, p->br->dev->name, IFNAMSIZ);
-       return;
-out:
-       return nft_meta_get_eval(expr, regs, pkt);
-err:
-       regs->verdict.code = NFT_BREAK;
-}
-
-static int nft_meta_bridge_get_init(const struct nft_ctx *ctx,
-                                   const struct nft_expr *expr,
-                                   const struct nlattr * const tb[])
-{
-       struct nft_meta *priv = nft_expr_priv(expr);
-       unsigned int len;
-
-       priv->key = ntohl(nla_get_be32(tb[NFTA_META_KEY]));
-       switch (priv->key) {
-       case NFT_META_BRI_IIFNAME:
-       case NFT_META_BRI_OIFNAME:
-               len = IFNAMSIZ;
-               break;
-       default:
-               return nft_meta_get_init(ctx, expr, tb);
-       }
-
-       priv->dreg = nft_parse_register(tb[NFTA_META_DREG]);
-       return nft_validate_register_store(ctx, priv->dreg, NULL,
-                                          NFT_DATA_VALUE, len);
-}
-
-static struct nft_expr_type nft_meta_bridge_type;
-static const struct nft_expr_ops nft_meta_bridge_get_ops = {
-       .type           = &nft_meta_bridge_type,
-       .size           = NFT_EXPR_SIZE(sizeof(struct nft_meta)),
-       .eval           = nft_meta_bridge_get_eval,
-       .init           = nft_meta_bridge_get_init,
-       .dump           = nft_meta_get_dump,
-};
-
-static const struct nft_expr_ops nft_meta_bridge_set_ops = {
-       .type           = &nft_meta_bridge_type,
-       .size           = NFT_EXPR_SIZE(sizeof(struct nft_meta)),
-       .eval           = nft_meta_set_eval,
-       .init           = nft_meta_set_init,
-       .destroy        = nft_meta_set_destroy,
-       .dump           = nft_meta_set_dump,
-       .validate       = nft_meta_set_validate,
-};
-
-static const struct nft_expr_ops *
-nft_meta_bridge_select_ops(const struct nft_ctx *ctx,
-                          const struct nlattr * const tb[])
-{
-       if (tb[NFTA_META_KEY] == NULL)
-               return ERR_PTR(-EINVAL);
-
-       if (tb[NFTA_META_DREG] && tb[NFTA_META_SREG])
-               return ERR_PTR(-EINVAL);
-
-       if (tb[NFTA_META_DREG])
-               return &nft_meta_bridge_get_ops;
-
-       if (tb[NFTA_META_SREG])
-               return &nft_meta_bridge_set_ops;
-
-       return ERR_PTR(-EINVAL);
-}
-
-static struct nft_expr_type nft_meta_bridge_type __read_mostly = {
-       .family         = NFPROTO_BRIDGE,
-       .name           = "meta",
-       .select_ops     = nft_meta_bridge_select_ops,
-       .policy         = nft_meta_policy,
-       .maxattr        = NFTA_META_MAX,
-       .owner          = THIS_MODULE,
-};
-
-static int __init nft_meta_bridge_module_init(void)
-{
-       return nft_register_expr(&nft_meta_bridge_type);
-}
-
-static void __exit nft_meta_bridge_module_exit(void)
-{
-       nft_unregister_expr(&nft_meta_bridge_type);
-}
-
-module_init(nft_meta_bridge_module_init);
-module_exit(nft_meta_bridge_module_exit);
-
-MODULE_LICENSE("GPL");
-MODULE_AUTHOR("Tomasz Bursztyka <tomasz.burszt...@linux.intel.com>");
-MODULE_ALIAS_NFT_AF_EXPR(AF_BRIDGE, "meta");
diff --git a/net/netfilter/nft_meta.c b/net/netfilter/nft_meta.c
index 8fb91940e2e7..6c0b82628117 100644
--- a/net/netfilter/nft_meta.c
+++ b/net/netfilter/nft_meta.c
@@ -1,5 +1,7 @@
 /*
  * Copyright (c) 2008-2009 Patrick McHardy <ka...@trash.net>
+ * Copyright (c) 2014 Intel Corporation
+ * Author: Tomasz Bursztyka <tomasz.burszt...@linux.intel.com>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
@@ -24,21 +26,35 @@
 #include <net/tcp_states.h> /* for TCP_TIME_WAIT */
 #include <net/netfilter/nf_tables.h>
 #include <net/netfilter/nf_tables_core.h>
-#include <net/netfilter/nft_meta.h>
 
 #include <uapi/linux/netfilter_bridge.h> /* NF_BR_PRE_ROUTING */
 
+struct nft_meta {
+       enum nft_meta_keys      key:8;
+       union {
+               enum nft_registers      dreg:8;
+               enum nft_registers      sreg:8;
+       };
+};
+
 static DEFINE_PER_CPU(struct rnd_state, nft_prandom_state);
 
-void nft_meta_get_eval(const struct nft_expr *expr,
-                      struct nft_regs *regs,
-                      const struct nft_pktinfo *pkt)
+#ifdef CONFIG_NF_TABLES_BRIDGE
+#include "../bridge/br_private.h"
+#endif
+
+static void nft_meta_get_eval(const struct nft_expr *expr,
+                             struct nft_regs *regs,
+                             const struct nft_pktinfo *pkt)
 {
        const struct nft_meta *priv = nft_expr_priv(expr);
        const struct sk_buff *skb = pkt->skb;
        const struct net_device *in = nft_in(pkt), *out = nft_out(pkt);
        struct sock *sk;
        u32 *dest = &regs->data[priv->dreg];
+#ifdef CONFIG_NF_TABLES_BRIDGE
+       const struct net_bridge_port *p;
+#endif
 
        switch (priv->key) {
        case NFT_META_LEN:
@@ -214,6 +230,18 @@ void nft_meta_get_eval(const struct nft_expr *expr,
        case NFT_META_SECPATH:
                nft_reg_store8(dest, !!skb->sp);
                break;
+#endif
+#ifdef CONFIG_NF_TABLES_BRIDGE
+       case NFT_META_BRI_IIFNAME:
+               if (in == NULL || (p = br_port_get_rcu(in)) == NULL)
+                       goto err;
+               strncpy((char *)dest, p->br->dev->name, IFNAMSIZ);
+               return;
+       case NFT_META_BRI_OIFNAME:
+               if (out == NULL || (p = br_port_get_rcu(out)) == NULL)
+                       goto err;
+               strncpy((char *)dest, p->br->dev->name, IFNAMSIZ);
+               return;
 #endif
        default:
                WARN_ON(1);
@@ -224,11 +252,10 @@ void nft_meta_get_eval(const struct nft_expr *expr,
 err:
        regs->verdict.code = NFT_BREAK;
 }
-EXPORT_SYMBOL_GPL(nft_meta_get_eval);
 
-void nft_meta_set_eval(const struct nft_expr *expr,
-                      struct nft_regs *regs,
-                      const struct nft_pktinfo *pkt)
+static void nft_meta_set_eval(const struct nft_expr *expr,
+                             struct nft_regs *regs,
+                              const struct nft_pktinfo *pkt)
 {
        const struct nft_meta *meta = nft_expr_priv(expr);
        struct sk_buff *skb = pkt->skb;
@@ -258,18 +285,16 @@ void nft_meta_set_eval(const struct nft_expr *expr,
                WARN_ON(1);
        }
 }
-EXPORT_SYMBOL_GPL(nft_meta_set_eval);
 
-const struct nla_policy nft_meta_policy[NFTA_META_MAX + 1] = {
+static const struct nla_policy nft_meta_policy[NFTA_META_MAX + 1] = {
        [NFTA_META_DREG]        = { .type = NLA_U32 },
        [NFTA_META_KEY]         = { .type = NLA_U32 },
        [NFTA_META_SREG]        = { .type = NLA_U32 },
 };
-EXPORT_SYMBOL_GPL(nft_meta_policy);
 
-int nft_meta_get_init(const struct nft_ctx *ctx,
-                     const struct nft_expr *expr,
-                     const struct nlattr * const tb[])
+static int nft_meta_get_init(const struct nft_ctx *ctx,
+                            const struct nft_expr *expr,
+                            const struct nlattr * const tb[])
 {
        struct nft_meta *priv = nft_expr_priv(expr);
        unsigned int len;
@@ -317,6 +342,14 @@ int nft_meta_get_init(const struct nft_ctx *ctx,
        case NFT_META_SECPATH:
                len = sizeof(u8);
                break;
+#endif
+#ifdef CONFIG_NF_TABLES_BRIDGE
+       case NFT_META_BRI_IIFNAME:
+       case NFT_META_BRI_OIFNAME:
+               if (ctx->family != NFPROTO_BRIDGE)
+                       return -EOPNOTSUPP;
+               len = IFNAMSIZ;
+               break;
 #endif
        default:
                return -EOPNOTSUPP;
@@ -326,7 +359,6 @@ int nft_meta_get_init(const struct nft_ctx *ctx,
        return nft_validate_register_store(ctx, priv->dreg, NULL,
                                           NFT_DATA_VALUE, len);
 }
-EXPORT_SYMBOL_GPL(nft_meta_get_init);
 
 static int nft_meta_get_validate(const struct nft_ctx *ctx,
                                 const struct nft_expr *expr,
@@ -360,9 +392,9 @@ static int nft_meta_get_validate(const struct nft_ctx *ctx,
 #endif
 }
 
-int nft_meta_set_validate(const struct nft_ctx *ctx,
-                         const struct nft_expr *expr,
-                         const struct nft_data **data)
+static int nft_meta_set_validate(const struct nft_ctx *ctx,
+                                const struct nft_expr *expr,
+                                const struct nft_data **data)
 {
        struct nft_meta *priv = nft_expr_priv(expr);
        unsigned int hooks;
@@ -388,11 +420,10 @@ int nft_meta_set_validate(const struct nft_ctx *ctx,
 
        return nft_chain_validate_hooks(ctx->chain, hooks);
 }
-EXPORT_SYMBOL_GPL(nft_meta_set_validate);
 
-int nft_meta_set_init(const struct nft_ctx *ctx,
-                     const struct nft_expr *expr,
-                     const struct nlattr * const tb[])
+static int nft_meta_set_init(const struct nft_ctx *ctx,
+                            const struct nft_expr *expr,
+                            const struct nlattr * const tb[])
 {
        struct nft_meta *priv = nft_expr_priv(expr);
        unsigned int len;
@@ -424,10 +455,9 @@ int nft_meta_set_init(const struct nft_ctx *ctx,
 
        return 0;
 }
-EXPORT_SYMBOL_GPL(nft_meta_set_init);
 
-int nft_meta_get_dump(struct sk_buff *skb,
-                     const struct nft_expr *expr)
+static int nft_meta_get_dump(struct sk_buff *skb,
+                            const struct nft_expr *expr)
 {
        const struct nft_meta *priv = nft_expr_priv(expr);
 
@@ -440,10 +470,8 @@ int nft_meta_get_dump(struct sk_buff *skb,
 nla_put_failure:
        return -1;
 }
-EXPORT_SYMBOL_GPL(nft_meta_get_dump);
 
-int nft_meta_set_dump(struct sk_buff *skb,
-                     const struct nft_expr *expr)
+static int nft_meta_set_dump(struct sk_buff *skb, const struct nft_expr *expr)
 {
        const struct nft_meta *priv = nft_expr_priv(expr);
 
@@ -457,17 +485,15 @@ int nft_meta_set_dump(struct sk_buff *skb,
 nla_put_failure:
        return -1;
 }
-EXPORT_SYMBOL_GPL(nft_meta_set_dump);
 
-void nft_meta_set_destroy(const struct nft_ctx *ctx,
-                         const struct nft_expr *expr)
+static void nft_meta_set_destroy(const struct nft_ctx *ctx,
+                                const struct nft_expr *expr)
 {
        const struct nft_meta *priv = nft_expr_priv(expr);
 
        if (priv->key == NFT_META_NFTRACE)
                static_branch_dec(&nft_trace_enabled);
 }
-EXPORT_SYMBOL_GPL(nft_meta_set_destroy);
 
 static struct nft_expr_type nft_meta_type;
 static const struct nft_expr_ops nft_meta_get_ops = {
-- 
2.16.1

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