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netfilter: nf_tables: validate the expr explicitly after init successfully

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When we want to validate the expr's dependency or hooks, we must do two
things to accomplish it. First, write a X_validate callback function
and point ->validate to it. Second, call X_validate in init routine.
This is very common, such as fib, nat, reject expr and so on ...

It is a little ugly, since we will call X_validate in the expr's init
routine, it's better to do it in nf_tables_newexpr. So we can avoid to
do this again and again. After doing this, the second step listed above
is not useful anymore, remove them now.

Patch was tested by nftables/tests/py/nft-test.py and
nftables/tests/shell/run-tests.sh.

Signed-off-by: Liping Zhang <zlpnobody@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Liping Zhang 2017-03-05 21:02:23 +08:00 committed by Pablo Neira Ayuso
parent 74664cf286
commit c56e3956c1
10 changed files with 14 additions and 40 deletions
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6
net/bridge/netfilter/nft_reject_bridge.c
View File

@ -375,11 +375,7 @@ static int nft_reject_bridge_init(const struct nft_ctx *ctx,
const struct nlattr * const tb[])
{
struct nft_reject *priv = nft_expr_priv(expr);
int icmp_code, err;
err = nft_reject_bridge_validate(ctx, expr, NULL);
if (err < 0)
return err;
int icmp_code;
if (tb[NFTA_REJECT_TYPE] == NULL)
return -EINVAL;

11
net/netfilter/nf_tables_api.c
View File

@ -1772,8 +1772,19 @@ static int nf_tables_newexpr(const struct nft_ctx *ctx,
goto err1;
}
if (ops->validate) {
const struct nft_data *data = NULL;
err = ops->validate(ctx, expr, &data);
if (err < 0)
goto err2;
}
return 0;
err2:
if (ops->destroy)
ops->destroy(ctx, expr);
err1:
expr->ops = NULL;
return err;

8
net/netfilter/nft_compat.c
View File

@ -230,10 +230,6 @@ nft_target_init(const struct nft_ctx *ctx, const struct nft_expr *expr,
union nft_entry e = {};
int ret;
ret = nft_compat_chain_validate_dependency(target->table, ctx->chain);
if (ret < 0)
goto err;
target_compat_from_user(target, nla_data(tb[NFTA_TARGET_INFO]), info);
if (ctx->nla[NFTA_RULE_COMPAT]) {
@ -419,10 +415,6 @@ nft_match_init(const struct nft_ctx *ctx, const struct nft_expr *expr,
union nft_entry e = {};
int ret;
ret = nft_compat_chain_validate_dependency(match->table, ctx->chain);
if (ret < 0)
goto err;
match_compat_from_user(match, nla_data(tb[NFTA_MATCH_INFO]), info);
if (ctx->nla[NFTA_RULE_COMPAT]) {

2
net/netfilter/nft_fib.c
View File

@ -112,7 +112,7 @@ int nft_fib_init(const struct nft_ctx *ctx, const struct nft_expr *expr,
if (err < 0)
return err;
return nft_fib_validate(ctx, expr, NULL);
return 0;
}
EXPORT_SYMBOL_GPL(nft_fib_init);

4
net/netfilter/nft_masq.c
View File

@ -46,10 +46,6 @@ int nft_masq_init(const struct nft_ctx *ctx,
struct nft_masq *priv = nft_expr_priv(expr);
int err;
err = nft_masq_validate(ctx, expr, NULL);
if (err)
return err;
if (tb[NFTA_MASQ_FLAGS]) {
priv->flags = ntohl(nla_get_be32(tb[NFTA_MASQ_FLAGS]));
if (priv->flags & ~NF_NAT_RANGE_MASK)

4
net/netfilter/nft_meta.c
View File

@ -370,10 +370,6 @@ int nft_meta_set_init(const struct nft_ctx *ctx,
return -EOPNOTSUPP;
}
err = nft_meta_set_validate(ctx, expr, NULL);
if (err < 0)
return err;
priv->sreg = nft_parse_register(tb[NFTA_META_SREG]);
err = nft_validate_register_load(priv->sreg, len);
if (err < 0)

4
net/netfilter/nft_nat.c
View File

@ -138,10 +138,6 @@ static int nft_nat_init(const struct nft_ctx *ctx, const struct nft_expr *expr,
return -EINVAL;
}
err = nft_nat_validate(ctx, expr, NULL);
if (err < 0)
return err;
if (tb[NFTA_NAT_FAMILY] == NULL)
return -EINVAL;

4
net/netfilter/nft_redir.c
View File

@ -47,10 +47,6 @@ int nft_redir_init(const struct nft_ctx *ctx,
unsigned int plen;
int err;
err = nft_redir_validate(ctx, expr, NULL);
if (err < 0)
return err;
plen = FIELD_SIZEOF(struct nf_nat_range, min_addr.all);
if (tb[NFTA_REDIR_REG_PROTO_MIN]) {
priv->sreg_proto_min =

5
net/netfilter/nft_reject.c
View File

@ -42,11 +42,6 @@ int nft_reject_init(const struct nft_ctx *ctx,
const struct nlattr * const tb[])
{
struct nft_reject *priv = nft_expr_priv(expr);
int err;
err = nft_reject_validate(ctx, expr, NULL);
if (err < 0)
return err;
if (tb[NFTA_REJECT_TYPE] == NULL)
return -EINVAL;

6
net/netfilter/nft_reject_inet.c
View File

@ -66,11 +66,7 @@ static int nft_reject_inet_init(const struct nft_ctx *ctx,
const struct nlattr * const tb[])
{
struct nft_reject *priv = nft_expr_priv(expr);
int icmp_code, err;
err = nft_reject_validate(ctx, expr, NULL);
if (err < 0)
return err;
int icmp_code;
if (tb[NFTA_REJECT_TYPE] == NULL)
return -EINVAL;