On Wed, Jun 19, 2019 at 03:16:24PM +0800, wenxu@xxxxxxxxx wrote:
> From: wenxu <wenxu@xxxxxxxxx>
>
> nft add table bridge firewall
> nft add chain bridge firewall zones { type filter hook prerouting priority - 300 \; }
> nft add rule bridge firewall zones counter ct zone set vlan id map { 100 : 1, 200 : 2 }
> As above set the bridge port with pvid, the received packet don't contain
> the vlan tag which means the packet should belong to vlan 200 through pvid.
> With this pacth user can get the pvid of bridge ports: "meta brpvid"
Would you also post the patches for nftables for review?
Would you post an example on how you use "meta brpvid" in your
ruleset? I don't see this is used in the example above,
More comments below.
> Signed-off-by: wenxu <wenxu@xxxxxxxxx>
> ---
> include/uapi/linux/netfilter/nf_tables.h | 2 ++
> net/netfilter/nft_meta.c | 17 +++++++++++++++++
> 2 files changed, 19 insertions(+)
>
> diff --git a/include/uapi/linux/netfilter/nf_tables.h b/include/uapi/linux/netfilter/nf_tables.h
> index 31a6b8f..4a16124 100644
> --- a/include/uapi/linux/netfilter/nf_tables.h
> +++ b/include/uapi/linux/netfilter/nf_tables.h
> @@ -793,6 +793,7 @@ enum nft_exthdr_attributes {
> * @NFT_META_SECPATH: boolean, secpath_exists (!!skb->sp)
> * @NFT_META_IIFKIND: packet input interface kind name (dev->rtnl_link_ops->kind)
> * @NFT_META_OIFKIND: packet output interface kind name (dev->rtnl_link_ops->kind)
> + * @NFT_META_BRI_PVID: packet input bridge port pvid
> */
> enum nft_meta_keys {
> NFT_META_LEN,
> @@ -823,6 +824,7 @@ enum nft_meta_keys {
> NFT_META_SECPATH,
> NFT_META_IIFKIND,
> NFT_META_OIFKIND,
> + NFT_META_BRI_PVID,
> };
>
> /**
> diff --git a/net/netfilter/nft_meta.c b/net/netfilter/nft_meta.c
> index 987d2d6..1fdb565 100644
> --- a/net/netfilter/nft_meta.c
> +++ b/net/netfilter/nft_meta.c
> @@ -243,6 +243,18 @@ void nft_meta_get_eval(const struct nft_expr *expr,
> goto err;
> strncpy((char *)dest, p->br->dev->name, IFNAMSIZ);
> return;
> + case NFT_META_BRI_PVID:
> + if (in == NULL || (p = br_port_get_rtnl_rcu(in)) == NULL)
> + goto err;
> + if (br_opt_get(p->br, BROPT_VLAN_ENABLED)) {
> + u16 pvid = br_get_pvid(nbp_vlan_group_rcu(p));
> +
> + if (pvid) {
> + nft_reg_store16(dest, pvid);
I think you should store pvid into dest if pvid is zero too, right?
You cannot assume destination register is set to zero.
> + return;
> + }
> + }
> + goto err;
> #endif
> case NFT_META_IIFKIND:
> if (in == NULL || in->rtnl_link_ops == NULL)
> @@ -370,6 +382,11 @@ static int nft_meta_get_init(const struct nft_ctx *ctx,
> return -EOPNOTSUPP;
> len = IFNAMSIZ;
> break;
> + case NFT_META_BRI_PVID:
> + if (ctx->family != NFPROTO_BRIDGE)
> + return -EOPNOTSUPP;
> + len = sizeof(u16);
> + break;
> #endif
> default:
> return -EOPNOTSUPP;
> --
> 1.8.3.1
>
