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netfilter: nft_ct: split nft_ct_init() into two functions for get/set

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For value spanning multiple registers, we need to validate the length
of data loads. In order to add this to nft_ct, we need the length from
key validation. Split the nft_ct_init() function into two functions
for the get and set operations as preparation for that.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Patrick McHardy 2014-03-29 10:43:03 +00:00 committed by Pablo Neira Ayuso
parent d2caa696ad
commit fe92ca45a1
1 changed files with 43 additions and 53 deletions
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96
net/netfilter/nft_ct.c
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@ -215,22 +215,14 @@ static void nft_ct_l3proto_module_put(uint8_t family)
nf_ct_l3proto_module_put(family);
}
static int nft_ct_init_validate_get(const struct nft_expr *expr,
const struct nlattr * const tb[])
static int nft_ct_get_init(const struct nft_ctx *ctx,
const struct nft_expr *expr,
const struct nlattr * const tb[])
{
struct nft_ct *priv = nft_expr_priv(expr);
int err;
if (tb[NFTA_CT_DIRECTION] != NULL) {
priv->dir = nla_get_u8(tb[NFTA_CT_DIRECTION]);
switch (priv->dir) {
case IP_CT_DIR_ORIGINAL:
case IP_CT_DIR_REPLY:
break;
default:
return -EINVAL;
}
}
priv->key = ntohl(nla_get_be32(tb[NFTA_CT_KEY]));
switch (priv->key) {
case NFT_CT_STATE:
case NFT_CT_DIRECTION:
@ -262,12 +254,42 @@ static int nft_ct_init_validate_get(const struct nft_expr *expr,
return -EOPNOTSUPP;
}
if (tb[NFTA_CT_DIRECTION] != NULL) {
priv->dir = nla_get_u8(tb[NFTA_CT_DIRECTION]);
switch (priv->dir) {
case IP_CT_DIR_ORIGINAL:
case IP_CT_DIR_REPLY:
break;
default:
return -EINVAL;
}
}
priv->dreg = ntohl(nla_get_be32(tb[NFTA_CT_DREG]));
err = nft_validate_output_register(priv->dreg);
if (err < 0)
return err;
err = nft_validate_data_load(ctx, priv->dreg, NULL, NFT_DATA_VALUE);
if (err < 0)
return err;
err = nft_ct_l3proto_try_module_get(ctx->afi->family);
if (err < 0)
return err;
return 0;
}
static int nft_ct_init_validate_set(uint32_t key)
static int nft_ct_set_init(const struct nft_ctx *ctx,
const struct nft_expr *expr,
const struct nlattr * const tb[])
{
switch (key) {
struct nft_ct *priv = nft_expr_priv(expr);
int err;
priv->key = ntohl(nla_get_be32(tb[NFTA_CT_KEY]));
switch (priv->key) {
#ifdef CONFIG_NF_CONNTRACK_MARK
case NFT_CT_MARK:
break;
@ -276,42 +298,10 @@ static int nft_ct_init_validate_set(uint32_t key)
return -EOPNOTSUPP;
}
return 0;
}
static int nft_ct_init(const struct nft_ctx *ctx,
const struct nft_expr *expr,
const struct nlattr * const tb[])
{
struct nft_ct *priv = nft_expr_priv(expr);
int err;
priv->key = ntohl(nla_get_be32(tb[NFTA_CT_KEY]));
if (tb[NFTA_CT_DREG]) {
err = nft_ct_init_validate_get(expr, tb);
if (err < 0)
return err;
priv->dreg = ntohl(nla_get_be32(tb[NFTA_CT_DREG]));
err = nft_validate_output_register(priv->dreg);
if (err < 0)
return err;
err = nft_validate_data_load(ctx, priv->dreg, NULL,
NFT_DATA_VALUE);
if (err < 0)
return err;
} else {
err = nft_ct_init_validate_set(priv->key);
if (err < 0)
return err;
priv->sreg = ntohl(nla_get_be32(tb[NFTA_CT_SREG]));
err = nft_validate_input_register(priv->sreg);
if (err < 0)
return err;
}
priv->sreg = ntohl(nla_get_be32(tb[NFTA_CT_SREG]));
err = nft_validate_input_register(priv->sreg);
if (err < 0)
return err;
err = nft_ct_l3proto_try_module_get(ctx->afi->family);
if (err < 0)
@ -372,7 +362,7 @@ static const struct nft_expr_ops nft_ct_get_ops = {
.type = &nft_ct_type,
.size = NFT_EXPR_SIZE(sizeof(struct nft_ct)),
.eval = nft_ct_get_eval,
.init = nft_ct_init,
.init = nft_ct_get_init,
.destroy = nft_ct_destroy,
.dump = nft_ct_get_dump,
};
@ -381,7 +371,7 @@ static const struct nft_expr_ops nft_ct_set_ops = {
.type = &nft_ct_type,
.size = NFT_EXPR_SIZE(sizeof(struct nft_ct)),
.eval = nft_ct_set_eval,
.init = nft_ct_init,
.init = nft_ct_set_init,
.destroy = nft_ct_destroy,
.dump = nft_ct_set_dump,
};