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netfilter: nft_ct: labels get support

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This also adds NF_CT_LABELS_MAX_SIZE so it can be re-used
as BUILD_BUG_ON in nft_ct.

At this time, nft doesn't yet support writing to the label area;
when this changes the label->words handling needs to be moved
out of xt_connlabel.c into nf_conntrack_labels.c.

Also removes a useless run-time check: words cannot grow beyond
4 (32 bit) or 2 (64bit) since xt_connlabel enforces a maximum of
128 labels.

Signed-off-by: Florian Westphal <fw@strlen.de>
Acked-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Florian Westphal 2014-02-18 15:25:32 +01:00 • committed by Pablo Neira Ayuso
commit d2bf2f34cc
4 changed files with 30 additions and 4 deletions
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4
include/net/netfilter/nf_conntrack_labels.h
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@ -7,6 +7,8 @@
#include <uapi/linux/netfilter/xt_connlabel.h>
#define NF_CT_LABELS_MAX_SIZE ((XT_CONNLABEL_MAXBIT + 1) / BITS_PER_BYTE)
struct nf_conn_labels {
u8 words;
unsigned long bits[];
@ -29,7 +31,7 @@ static inline struct nf_conn_labels *nf_ct_labels_ext_add(struct nf_conn *ct)
u8 words;
words = ACCESS_ONCE(net->ct.label_words);
if (words == 0 || WARN_ON_ONCE(words > 8))
if (words == 0)
return NULL;
cl_ext = nf_ct_ext_add_length(ct, NF_CT_EXT_LABELS,