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netfilter: nf_tables: validate the expr explicitly after init successfully 

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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

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;