On Thu, Jun 27, 2019 at 10:09:17AM +0800, wenxu@xxxxxxxxx wrote:
> From: wenxu <wenxu@xxxxxxxxx>
>
> This patch provide a meta vlan to set the vlan tag of the packet.
>
> for q-in-q vlan id 20:
> meta vlan set 0x88a8:20
Actually, I think this is not very useful for stacked vlan since this
just sets/mangles the existing meta vlan data.
We'll need infrastructure that uses skb_vlan_push() and _pop().
Patch looks good anyway, such infrastructure to push/pop can be added
later on.
Thanks.
> set the default 0x8100 vlan type with vlan id 20
> meta vlan set 20
>
> Signed-off-by: wenxu <wenxu@xxxxxxxxx>
> ---
> include/uapi/linux/netfilter/nf_tables.h | 4 ++++
> net/netfilter/nft_meta.c | 27 ++++++++++++++++++++++++++-
> 2 files changed, 30 insertions(+), 1 deletion(-)
>
> diff --git a/include/uapi/linux/netfilter/nf_tables.h b/include/uapi/linux/netfilter/nf_tables.h
> index 0b18646..cf037f2 100644
> --- a/include/uapi/linux/netfilter/nf_tables.h
> +++ b/include/uapi/linux/netfilter/nf_tables.h
> @@ -797,6 +797,7 @@ enum nft_exthdr_attributes {
> * @NFT_META_OIFKIND: packet output interface kind name (dev->rtnl_link_ops->kind)
> * @NFT_META_BRI_PVID: packet input bridge port pvid
> * @NFT_META_BRI_VLAN_PROTO: packet input bridge vlan proto
> + * @NFT_META_VLAN: packet vlan metadata
> */
> enum nft_meta_keys {
> NFT_META_LEN,
> @@ -829,6 +830,7 @@ enum nft_meta_keys {
> NFT_META_OIFKIND,
> NFT_META_BRI_PVID,
> NFT_META_BRI_VLAN_PROTO,
> + NFT_META_VLAN,
> };
>
> /**
> @@ -895,12 +897,14 @@ enum nft_hash_attributes {
> * @NFTA_META_DREG: destination register (NLA_U32)
> * @NFTA_META_KEY: meta data item to load (NLA_U32: nft_meta_keys)
> * @NFTA_META_SREG: source register (NLA_U32)
> + * @NFTA_META_SREG2: source register (NLA_U32)
> */
> enum nft_meta_attributes {
> NFTA_META_UNSPEC,
> NFTA_META_DREG,
> NFTA_META_KEY,
> NFTA_META_SREG,
> + NFTA_META_SREG2,
> __NFTA_META_MAX
> };
> #define NFTA_META_MAX (__NFTA_META_MAX - 1)
> diff --git a/net/netfilter/nft_meta.c b/net/netfilter/nft_meta.c
> index e3adf6a..29a6679 100644
> --- a/net/netfilter/nft_meta.c
> +++ b/net/netfilter/nft_meta.c
> @@ -28,7 +28,10 @@ struct nft_meta {
> enum nft_meta_keys key:8;
> union {
> enum nft_registers dreg:8;
> - enum nft_registers sreg:8;
> + struct {
> + enum nft_registers sreg:8;
> + enum nft_registers sreg2:8;
> + };
> };
> };
>
> @@ -312,6 +315,17 @@ static void nft_meta_set_eval(const struct nft_expr *expr,
> skb->secmark = value;
> break;
> #endif
> + case NFT_META_VLAN: {
> + u32 *sreg2 = ®s->data[meta->sreg2];
> + __be16 vlan_proto;
> + u16 vlan_tci;
> +
> + vlan_tci = nft_reg_load16(sreg);
> + vlan_proto = nft_reg_load16(sreg2);
> +
> + __vlan_hwaccel_put_tag(skb, vlan_proto, vlan_tci);
> + break;
> + }
> default:
> WARN_ON(1);
> }
> @@ -321,6 +335,7 @@ static void nft_meta_set_eval(const struct nft_expr *expr,
> [NFTA_META_DREG] = { .type = NLA_U32 },
> [NFTA_META_KEY] = { .type = NLA_U32 },
> [NFTA_META_SREG] = { .type = NLA_U32 },
> + [NFTA_META_SREG2] = { .type = NLA_U32 },
> };
>
> static int nft_meta_get_init(const struct nft_ctx *ctx,
> @@ -483,6 +498,13 @@ static int nft_meta_set_init(const struct nft_ctx *ctx,
> case NFT_META_PKTTYPE:
> len = sizeof(u8);
> break;
> + case NFT_META_VLAN:
> + len = sizeof(u16);
> + priv->sreg2 = nft_parse_register(tb[NFTA_META_SREG2]);
> + err = nft_validate_register_load(priv->sreg2, len);
> + if (err < 0)
> + return err;
> + break;
> default:
> return -EOPNOTSUPP;
> }
> @@ -521,6 +543,9 @@ static int nft_meta_set_dump(struct sk_buff *skb, const struct nft_expr *expr)
> goto nla_put_failure;
> if (nft_dump_register(skb, NFTA_META_SREG, priv->sreg))
> goto nla_put_failure;
> + if (priv->key == NFT_META_VLAN &&
> + nft_dump_register(skb, NFTA_META_SREG2, priv->sreg2))
> + goto nla_put_failure;
>
> return 0;
>
> --
> 1.8.3.1
>
