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ethtool: trim policy tables

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Since ethtool uses strict attribute validation there's no need
to initialize all attributes in policy tables. 0 is NLA_UNSPEC
which is going to be rejected. Remove the NLA_REJECTs.

Similarly attributes above maxattrs are rejected, so there's
no need to always size the policy tables to ETHTOOL_A_..._MAX.

v2: - new patch

Suggested-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jakub Kicinski
2020-10-05 15:07:35 -07:00
committed by David S. Miller
parent 5028588b62
commit ff419afa43
19 changed files with 83 additions and 229 deletions
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26
net/ethtool/bitset.c
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@@ -302,8 +302,7 @@ nla_put_failure:
return -EMSGSIZE;
}
static const struct nla_policy bitset_policy[ETHTOOL_A_BITSET_MAX + 1] = {
[ETHTOOL_A_BITSET_UNSPEC] = { .type = NLA_REJECT },
static const struct nla_policy bitset_policy[] = {
[ETHTOOL_A_BITSET_NOMASK] = { .type = NLA_FLAG },
[ETHTOOL_A_BITSET_SIZE] = NLA_POLICY_MAX(NLA_U32,
ETHNL_MAX_BITSET_SIZE),
@@ -312,8 +311,7 @@ static const struct nla_policy bitset_policy[ETHTOOL_A_BITSET_MAX + 1] = {
[ETHTOOL_A_BITSET_MASK] = { .type = NLA_BINARY },
};
static const struct nla_policy bit_policy[ETHTOOL_A_BITSET_BIT_MAX + 1] = {
[ETHTOOL_A_BITSET_BIT_UNSPEC] = { .type = NLA_REJECT },
static const struct nla_policy bit_policy[] = {
[ETHTOOL_A_BITSET_BIT_INDEX] = { .type = NLA_U32 },
[ETHTOOL_A_BITSET_BIT_NAME] = { .type = NLA_NUL_STRING },
[ETHTOOL_A_BITSET_BIT_VALUE] = { .type = NLA_FLAG },
@@ -329,10 +327,10 @@ static const struct nla_policy bit_policy[ETHTOOL_A_BITSET_BIT_MAX + 1] = {
*/
int ethnl_bitset_is_compact(const struct nlattr *bitset, bool *compact)
{
struct nlattr *tb[ETHTOOL_A_BITSET_MAX + 1];
struct nlattr *tb[ARRAY_SIZE(bitset_policy)];
int ret;
ret = nla_parse_nested(tb, ETHTOOL_A_BITSET_MAX, bitset,
ret = nla_parse_nested(tb, ARRAY_SIZE(bitset_policy) - 1, bitset,
bitset_policy, NULL);
if (ret < 0)
return ret;
@@ -381,10 +379,10 @@ static int ethnl_parse_bit(unsigned int *index, bool *val, unsigned int nbits,
ethnl_string_array_t names,
struct netlink_ext_ack *extack)
{
struct nlattr *tb[ETHTOOL_A_BITSET_BIT_MAX + 1];
struct nlattr *tb[ARRAY_SIZE(bit_policy)];
int ret, idx;
ret = nla_parse_nested(tb, ETHTOOL_A_BITSET_BIT_MAX, bit_attr,
ret = nla_parse_nested(tb, ARRAY_SIZE(bit_policy) - 1, bit_attr,
bit_policy, extack);
if (ret < 0)
return ret;
@@ -555,15 +553,15 @@ int ethnl_update_bitset32(u32 *bitmap, unsigned int nbits,
const struct nlattr *attr, ethnl_string_array_t names,
struct netlink_ext_ack *extack, bool *mod)
{
struct nlattr *tb[ETHTOOL_A_BITSET_MAX + 1];
struct nlattr *tb[ARRAY_SIZE(bitset_policy)];
unsigned int change_bits;
bool no_mask;
int ret;
if (!attr)
return 0;
ret = nla_parse_nested(tb, ETHTOOL_A_BITSET_MAX, attr, bitset_policy,
extack);
ret = nla_parse_nested(tb, ARRAY_SIZE(bitset_policy) - 1, attr,
bitset_policy, extack);
if (ret < 0)
return ret;
@@ -608,7 +606,7 @@ int ethnl_parse_bitset(unsigned long *val, unsigned long *mask,
ethnl_string_array_t names,
struct netlink_ext_ack *extack)
{
struct nlattr *tb[ETHTOOL_A_BITSET_MAX + 1];
struct nlattr *tb[ARRAY_SIZE(bitset_policy)];
const struct nlattr *bit_attr;
bool no_mask;
int rem;
@@ -616,8 +614,8 @@ int ethnl_parse_bitset(unsigned long *val, unsigned long *mask,
if (!attr)
return 0;
ret = nla_parse_nested(tb, ETHTOOL_A_BITSET_MAX, attr, bitset_policy,
extack);
ret = nla_parse_nested(tb, ARRAY_SIZE(bitset_policy) - 1, attr,
bitset_policy, extack);
if (ret < 0)
return ret;
no_mask = tb[ETHTOOL_A_BITSET_NOMASK];