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netfilter: nf_tables: mark stateful expressions 

Add a flag to mark stateful expressions.

This is used for dynamic expression instanstiation to limit the usable
expressions. Strictly speaking only the dynset expression can not be
used in order to avoid recursion, but since dynamically instantiating
non-stateful expressions will simply create an identical copy, which
behaves no differently than the original, this limits to expressions
where it actually makes sense to dynamically instantiate them.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
wifi-calibration
Patrick McHardy 2015-04-11 10:46:40 +01:00 committed by Pablo Neira Ayuso
parent f25ad2e907
commit 151d799a61
3 changed files with 6 additions and 0 deletions
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4
include/net/netfilter/nf_tables.h
View File

@ -583,6 +583,7 @@ static inline void nft_set_gc_batch_add(struct nft_set_gc_batch *gcb,
* @policy: netlink attribute policy
* @maxattr: highest netlink attribute number
* @family: address family for AF-specific types
* @flags: expression type flags
*/
struct nft_expr_type {
const struct nft_expr_ops *(*select_ops)(const struct nft_ctx *,
@ -594,8 +595,11 @@ struct nft_expr_type {
const struct nla_policy *policy;
unsigned int maxattr;
u8 family;
u8 flags;
};
#define NFT_EXPR_STATEFUL 0x1
/**
* struct nft_expr_ops - nf_tables expression operations
*

1
net/netfilter/nft_counter.c
View File

@ -92,6 +92,7 @@ static struct nft_expr_type nft_counter_type __read_mostly = {
.ops = &nft_counter_ops,
.policy = nft_counter_policy,
.maxattr = NFTA_COUNTER_MAX,
.flags = NFT_EXPR_STATEFUL,
.owner = THIS_MODULE,
};

1
net/netfilter/nft_limit.c
View File

@ -98,6 +98,7 @@ static struct nft_expr_type nft_limit_type __read_mostly = {
.ops = &nft_limit_ops,
.policy = nft_limit_policy,
.maxattr = NFTA_LIMIT_MAX,
.flags = NFT_EXPR_STATEFUL,
.owner = THIS_MODULE,
};