netfilter: bridge: add reject support

So you can reject IPv4 and IPv6 packets from bridge tables. If the ether
proto is now known, default on dropping the packet instead.

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

3 files changed, 74 insertions, 0 deletions

diff --git a/net/bridge/netfilter/Kconfig b/net/bridge/netfilter/Kconfig
index 4ce0b313f72c..9cebf47ac840 100644
--- a/net/bridge/netfilter/Kconfig
+++ b/net/bridge/netfilter/Kconfig
@@ -14,6 +14,12 @@ config NFT_BRIDGE_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
+        help
+          Add support to reject packets.
+
 config NF_LOG_BRIDGE
         tristate "Bridge packet logging"
 
diff --git a/net/bridge/netfilter/Makefile b/net/bridge/netfilter/Makefile
index 1f78ea0d90e4..061d121cf8b9 100644
--- a/net/bridge/netfilter/Makefile
+++ b/net/bridge/netfilter/Makefile
@@ -4,6 +4,7 @@
 
 obj-$(CONFIG_NF_TABLES_BRIDGE) += nf_tables_bridge.o
 obj-$(CONFIG_NFT_BRIDGE_META)  += nft_meta_bridge.o
+obj-$(CONFIG_NFT_BRIDGE_REJECT)  += nft_reject_bridge.o
 
 # packet logging
 obj-$(CONFIG_NF_LOG_BRIDGE) += nf_log_bridge.o
diff --git a/net/bridge/netfilter/nft_reject_bridge.c b/net/bridge/netfilter/nft_reject_bridge.c
new file mode 100644
index 000000000000..ee3ffe93e14e
--- /dev/null
+++ b/net/bridge/netfilter/nft_reject_bridge.c
@@ -0,0 +1,67 @@
+/*
+ * Copyright (c) 2014 Pablo Neira Ayuso <pablo@netfilter.org>
+ *
+ * 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_reject.h>
+
+static void nft_reject_bridge_eval(const struct nft_expr *expr,
+                                 struct nft_data data[NFT_REG_MAX + 1],
+                                 const struct nft_pktinfo *pkt)
+{
+        switch (eth_hdr(pkt->skb)->h_proto) {
+        case htons(ETH_P_IP):
+                return nft_reject_ipv4_eval(expr, data, pkt);
+        case htons(ETH_P_IPV6):
+                return nft_reject_ipv6_eval(expr, data, pkt);
+        default:
+                /* No explicit way to reject this protocol, drop it. */
+                data[NFT_REG_VERDICT].verdict = NF_DROP;
+                break;
+        }
+}
+
+static struct nft_expr_type nft_reject_bridge_type;
+static const struct nft_expr_ops nft_reject_bridge_ops = {
+        .type           = &nft_reject_bridge_type,
+        .size           = NFT_EXPR_SIZE(sizeof(struct nft_reject)),
+        .eval           = nft_reject_bridge_eval,
+        .init           = nft_reject_init,
+        .dump           = nft_reject_dump,
+};
+
+static struct nft_expr_type nft_reject_bridge_type __read_mostly = {
+        .family         = NFPROTO_BRIDGE,
+        .name           = "reject",
+        .ops            = &nft_reject_bridge_ops,
+        .policy         = nft_reject_policy,
+        .maxattr        = NFTA_REJECT_MAX,
+        .owner          = THIS_MODULE,
+};
+
+static int __init nft_reject_bridge_module_init(void)
+{
+        return nft_register_expr(&nft_reject_bridge_type);
+}
+
+static void __exit nft_reject_bridge_module_exit(void)
+{
+        nft_unregister_expr(&nft_reject_bridge_type);
+}
+
+module_init(nft_reject_bridge_module_init);
+module_exit(nft_reject_bridge_module_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>");
+MODULE_ALIAS_NFT_AF_EXPR(AF_BRIDGE, "reject");