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| author | Pablo Neira Ayuso <pablo@netfilter.org> | 2014-02-19 17:27:06 +0100 |
|---|---|---|
| committer | Pablo Neira Ayuso <pablo@netfilter.org> | 2014-02-27 16:56:00 +0100 |
| commit | 0768b3b3d228c5acf2075f40f3d25cda30011d4f (patch) | |
| tree | 692c78e345c357dbc036c093abb3a1062e928291 /include/net | |
| parent | 39111fd261f544acb0333d59fca27abc2f767ad7 (diff) | |
| download | linux-stable-0768b3b3d228c5acf2075f40f3d25cda30011d4f.tar.gz linux-stable-0768b3b3d228c5acf2075f40f3d25cda30011d4f.tar.bz2 linux-stable-0768b3b3d228c5acf2075f40f3d25cda30011d4f.zip | |
netfilter: nf_tables: add optional user data area to rules
This allows us to store user comment strings, but it could be also
used to store any kind of information that the user application needs
to link to the rule.
Scratch 8 bits for the new ulen field that indicates the length the
user data area. 4 bits from the handle (so it's 42 bits long, according
to Patrick, it would last 139 years with 1000 new rules per second)
and 4 bits from dlen (so the expression data area is 4K, which seems
sufficient by now even considering the compatibility layer).
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Acked-by: Patrick McHardy <kaber@trash.net>
Diffstat (limited to 'include/net')
| -rw-r--r-- | include/net/netfilter/nf_tables.h | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/include/net/netfilter/nf_tables.h b/include/net/netfilter/nf_tables.h index 81abd61500f4..5af56da6d6c6 100644 --- a/include/net/netfilter/nf_tables.h +++ b/include/net/netfilter/nf_tables.h @@ -326,13 +326,15 @@ static inline void *nft_expr_priv(const struct nft_expr *expr) * @handle: rule handle * @genmask: generation mask * @dlen: length of expression data + * @ulen: length of user data (used for comments) * @data: expression data */ struct nft_rule { struct list_head list; - u64 handle:46, + u64 handle:42, genmask:2, - dlen:16; + dlen:12, + ulen:8; unsigned char data[] __attribute__((aligned(__alignof__(struct nft_expr)))); }; @@ -371,6 +373,11 @@ static inline struct nft_expr *nft_expr_last(const struct nft_rule *rule) return (struct nft_expr *)&rule->data[rule->dlen]; } +static inline void *nft_userdata(const struct nft_rule *rule) +{ + return (void *)&rule->data[rule->dlen]; +} + /* * The last pointer isn't really necessary, but the compiler isn't able to * determine that the result of nft_expr_last() is always the same since it |