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netfilter: nft_meta_bridge: introduce NFT_META_BRI_IIFHWADDR support

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Expose the input bridge interface ethernet address so it can be used to
redirect the packet to the receiving physical device for processing.

Tested with nft command line tool.

table bridge nat {
	chain PREROUTING {
		type filter hook prerouting priority 0; policy accept;
		ether daddr de:ad:00:00:be:ef meta pkttype set host ether daddr set meta ibrhwdr accept
	}
}

Joint work with Pablo Neira.

Signed-off-by: Fernando Fernandez Mancera <fmancera@suse.de>
Signed-off-by: Florian Westphal <fw@strlen.de>
This commit is contained in:
Fernando Fernandez Mancera
2025-09-02 13:28:08 +02:00
committed by Florian Westphal
parent ba941796d7
commit cbd2257dc9
2 changed files with 13 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
include/uapi/linux/netfilter/nf_tables.h
View File

@@ -959,6 +959,7 @@ enum nft_exthdr_attributes {
* @NFT_META_SDIF: slave device interface index
* @NFT_META_SDIFNAME: slave device interface name
* @NFT_META_BRI_BROUTE: packet br_netfilter_broute bit
* @NFT_META_BRI_IIFHWADDR: packet input bridge interface ethernet address
*/
enum nft_meta_keys {
NFT_META_LEN,
@@ -999,6 +1000,7 @@ enum nft_meta_keys {
NFT_META_SDIFNAME,
NFT_META_BRI_BROUTE,
__NFT_META_IIFTYPE,
NFT_META_BRI_IIFHWADDR,
};
/**

11
net/bridge/netfilter/nft_meta_bridge.c
View File

@@ -59,6 +59,13 @@ static void nft_meta_bridge_get_eval(const struct nft_expr *expr,
nft_reg_store_be16(dest, htons(p_proto));
return;
}
case NFT_META_BRI_IIFHWADDR:
br_dev = nft_meta_get_bridge(in);
if (!br_dev)
goto err;
memcpy(dest, br_dev->dev_addr, ETH_ALEN);
return;
default:
return nft_meta_get_eval(expr, regs, pkt);
}
@@ -86,6 +93,9 @@ static int nft_meta_bridge_get_init(const struct nft_ctx *ctx,
case NFT_META_BRI_IIFVPROTO:
len = sizeof(u16);
break;
case NFT_META_BRI_IIFHWADDR:
len = ETH_ALEN;
break;
default:
return nft_meta_get_init(ctx, expr, tb);
}
@@ -175,6 +185,7 @@ static int nft_meta_bridge_set_validate(const struct nft_ctx *ctx,
switch (priv->key) {
case NFT_META_BRI_BROUTE:
case NFT_META_BRI_IIFHWADDR:
hooks = 1 << NF_BR_PRE_ROUTING;
break;
default: