This allows to redirect bridged packets to local machine.
ether type ip ether daddr set aa:53:08:12:34:56 meta pkttype set unicast
Without 'set unicast', ip stack discards PACKET_OTHERHOST skbs.
Signed-off-by: Florian Westphal <fw@xxxxxxxxx>
---
Hi Patrick,
as discussed this adds meta set support for pkttype.
I'm not sure how restricted it should be; this only allows
changing PACKET_OTHERHOST to something else, but I'm not sure
if this should do more checks on value (e.g. only allow
PACKET_HOST?) or even less (e.g. also allow mangling
mcast and the like?).
It only allows NETDEV and BRIDGE families but thats mainly
because the other ones make no sense (PACKET_OTHERHOST
cannot happen w. IPV4, 6, INET since stack already drops them earlier).
diff --git a/net/netfilter/nft_meta.c b/net/netfilter/nft_meta.c
index 9dfaf4d..3d64742 100644
--- a/net/netfilter/nft_meta.c
+++ b/net/netfilter/nft_meta.c
@@ -24,6 +24,8 @@
#include <net/netfilter/nf_tables.h>
#include <net/netfilter/nft_meta.h>
+#include <uapi/linux/netfilter_bridge.h> /* NF_BR_PRE_ROUTING */
+
void nft_meta_get_eval(const struct nft_expr *expr,
struct nft_regs *regs,
const struct nft_pktinfo *pkt)
@@ -203,6 +205,10 @@ void nft_meta_set_eval(const struct nft_expr *expr,
case NFT_META_PRIORITY:
skb->priority = value;
break;
+ case NFT_META_PKTTYPE:
+ if (skb->pkt_type == PACKET_OTHERHOST)
+ skb->pkt_type = value;
+ break;
case NFT_META_NFTRACE:
skb->nf_trace = 1;
break;
@@ -271,6 +277,24 @@ int nft_meta_get_init(const struct nft_ctx *ctx,
}
EXPORT_SYMBOL_GPL(nft_meta_get_init);
+static int nft_meta_set_init_pkttype(const struct nft_ctx *ctx)
+{
+ unsigned int hooks;
+
+ switch (ctx->afi->family) {
+ case NFPROTO_BRIDGE:
+ hooks = 1 << NF_BR_PRE_ROUTING;
+ break;
+ case NFPROTO_NETDEV:
+ hooks = 1 << NF_NETDEV_INGRESS;
+ break;
+ default:
+ return -EOPNOTSUPP;
+ }
+
+ return nft_chain_validate_hooks(ctx->chain, hooks);
+}
+
int nft_meta_set_init(const struct nft_ctx *ctx,
const struct nft_expr *expr,
const struct nlattr * const tb[])
@@ -288,6 +312,12 @@ int nft_meta_set_init(const struct nft_ctx *ctx,
case NFT_META_NFTRACE:
len = sizeof(u8);
break;
+ case NFT_META_PKTTYPE:
+ err = nft_meta_set_init_pkttype(ctx);
+ if (err)
+ return err;
+ len = sizeof(u8);
+ break;
default:
return -EOPNOTSUPP;
}
--
2.4.10
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