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netfilter: nft_meta: add cgroup support

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This allows you to filter traffic by process control group (cgroup).

Signed-off-by: Ana Rey <anarey@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Ana Rey 2014-11-03 18:10:50 +01:00 committed by Pablo Neira Ayuso
parent c5a589cc30
commit ce674173e9
2 changed files with 9 additions and 0 deletions
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2
include/uapi/linux/netfilter/nf_tables.h
View File

@ -579,6 +579,7 @@ enum nft_exthdr_attributes {
* @NFT_META_CPU: cpu id through smp_processor_id()
* @NFT_META_IIFGROUP: packet input interface group
* @NFT_META_OIFGROUP: packet output interface group
* @NFT_META_CGROUP: socket control group (skb->sk->sk_classid)
*/
enum nft_meta_keys {
NFT_META_LEN,
@ -604,6 +605,7 @@ enum nft_meta_keys {
NFT_META_CPU,
NFT_META_IIFGROUP,
NFT_META_OIFGROUP,
NFT_META_CGROUP,
};
/**

7
net/netfilter/nft_meta.c
View File

@ -165,6 +165,12 @@ void nft_meta_get_eval(const struct nft_expr *expr,
goto err;
dest->data[0] = out->group;
break;
case NFT_META_CGROUP:
if (skb->sk == NULL)
break;
dest->data[0] = skb->sk->sk_classid;
break;
default:
WARN_ON(1);
goto err;
@ -240,6 +246,7 @@ int nft_meta_get_init(const struct nft_ctx *ctx,
case NFT_META_CPU:
case NFT_META_IIFGROUP:
case NFT_META_OIFGROUP:
case NFT_META_CGROUP:
break;
default:
return -EOPNOTSUPP;