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author | Pablo Neira Ayuso <pablo@netfilter.org> | 2013-10-14 00:06:06 +0200 |
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committer | Pablo Neira Ayuso <pablo@netfilter.org> | 2013-10-14 18:00:04 +0200 |
commit | 0ca743a5599199152a31a7146b83213c786c2eb2 (patch) | |
tree | fd5cd87e1e1cf3f43d5868304c7c45f9bf11cef5 /net/netfilter/nft_immediate.c | |
parent | 9370761c56b66aa5c65e069a7b010111a025018d (diff) | |
download | op-kernel-dev-0ca743a5599199152a31a7146b83213c786c2eb2.zip op-kernel-dev-0ca743a5599199152a31a7146b83213c786c2eb2.tar.gz |
netfilter: nf_tables: add compatibility layer for x_tables
This patch adds the x_tables compatibility layer. This allows you
to use existing x_tables matches and targets from nf_tables.
This compatibility later allows us to use existing matches/targets
for features that are still missing in nf_tables. We can progressively
replace them with native nf_tables extensions. It also provides the
userspace compatibility software that allows you to express the
rule-set using the iptables syntax but using the nf_tables kernel
components.
In order to get this compatibility layer working, I've done the
following things:
* add NFNL_SUBSYS_NFT_COMPAT: this new nfnetlink subsystem is used
to query the x_tables match/target revision, so we don't need to
use the native x_table getsockopt interface.
* emulate xt structures: this required extending the struct nft_pktinfo
to include the fragment offset, which is already obtained from
ip[6]_tables and that is used by some matches/targets.
* add support for default policy to base chains, required to emulate
x_tables.
* add NFTA_CHAIN_USE attribute to obtain the number of references to
chains, required by x_tables emulation.
* add chain packet/byte counters using per-cpu.
* support 32-64 bits compat.
For historical reasons, this patch includes the following patches
that were posted in the netfilter-devel mailing list.
From Pablo Neira Ayuso:
* nf_tables: add default policy to base chains
* netfilter: nf_tables: add NFTA_CHAIN_USE attribute
* nf_tables: nft_compat: private data of target and matches in contiguous area
* nf_tables: validate hooks for compat match/target
* nf_tables: nft_compat: release cached matches/targets
* nf_tables: x_tables support as a compile time option
* nf_tables: fix alias for xtables over nftables module
* nf_tables: add packet and byte counters per chain
* nf_tables: fix per-chain counter stats if no counters are passed
* nf_tables: don't bump chain stats
* nf_tables: add protocol and flags for xtables over nf_tables
* nf_tables: add ip[6]t_entry emulation
* nf_tables: move specific layer 3 compat code to nf_tables_ipv[4|6]
* nf_tables: support 32bits-64bits x_tables compat
* nf_tables: fix compilation if CONFIG_COMPAT is disabled
From Patrick McHardy:
* nf_tables: move policy to struct nft_base_chain
* nf_tables: send notifications for base chain policy changes
From Alexander Primak:
* nf_tables: remove the duplicate NF_INET_LOCAL_OUT
From Nicolas Dichtel:
* nf_tables: fix compilation when nf-netlink is a module
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'net/netfilter/nft_immediate.c')
-rw-r--r-- | net/netfilter/nft_immediate.c | 12 |
1 files changed, 7 insertions, 5 deletions
diff --git a/net/netfilter/nft_immediate.c b/net/netfilter/nft_immediate.c index 1bfeeaf..f169501 100644 --- a/net/netfilter/nft_immediate.c +++ b/net/netfilter/nft_immediate.c @@ -90,14 +90,16 @@ nla_put_failure: return -1; } -static const struct nft_data *nft_immediate_get_verdict(const struct nft_expr *expr) +static int nft_immediate_validate(const struct nft_ctx *ctx, + const struct nft_expr *expr, + const struct nft_data **data) { const struct nft_immediate_expr *priv = nft_expr_priv(expr); if (priv->dreg == NFT_REG_VERDICT) - return &priv->data; - else - return NULL; + *data = &priv->data; + + return 0; } static struct nft_expr_type nft_imm_type; @@ -108,7 +110,7 @@ static const struct nft_expr_ops nft_imm_ops = { .init = nft_immediate_init, .destroy = nft_immediate_destroy, .dump = nft_immediate_dump, - .get_verdict = nft_immediate_get_verdict, + .validate = nft_immediate_validate, }; static struct nft_expr_type nft_imm_type __read_mostly = { |