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netlink: allow be16 and be32 types in all uint policy checks

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__NLA_IS_BEINT_TYPE(tp) isn't useful.  NLA_BE16/32 are identical to
NLA_U16/32, the only difference is that it tells the netlink validation
functions that byteorder conversion might be needed before comparing
the value to the policy min/max ones.

After this change all policy macros that can be used with UINT types,
such as NLA_POLICY_MASK() can also be used with NLA_BE16/32.

This will be used to validate nf_tables flag attributes which
are in bigendian byte order.

Signed-off-by: Florian Westphal <fw@strlen.de>
This commit is contained in:
Florian Westphal 2023-07-18 09:52:29 +02:00
parent a927d77778
commit 5fac9b7c16
2 changed files with 9 additions and 7 deletions
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8
include/net/netlink.h
View File

@ -376,11 +376,10 @@ struct nla_policy {
{ .type = NLA_BITFIELD32, .bitfield32_valid = valid }
#define __NLA_IS_UINT_TYPE(tp) \
(tp == NLA_U8 || tp == NLA_U16 || tp == NLA_U32 || tp == NLA_U64)
(tp == NLA_U8 || tp == NLA_U16 || tp == NLA_U32 || \
tp == NLA_U64 || tp == NLA_BE16 || tp == NLA_BE32)
#define __NLA_IS_SINT_TYPE(tp) \
(tp == NLA_S8 || tp == NLA_S16 || tp == NLA_S32 || tp == NLA_S64)
#define __NLA_IS_BEINT_TYPE(tp) \
(tp == NLA_BE16 || tp == NLA_BE32)
#define __NLA_ENSURE(condition) BUILD_BUG_ON_ZERO(!(condition))
#define NLA_ENSURE_UINT_TYPE(tp) \
@ -394,7 +393,6 @@ struct nla_policy {
#define NLA_ENSURE_INT_OR_BINARY_TYPE(tp) \
(__NLA_ENSURE(__NLA_IS_UINT_TYPE(tp) || \
__NLA_IS_SINT_TYPE(tp) || \
__NLA_IS_BEINT_TYPE(tp) || \
tp == NLA_MSECS || \
tp == NLA_BINARY) + tp)
#define NLA_ENSURE_NO_VALIDATION_PTR(tp) \
@ -402,8 +400,6 @@ struct nla_policy {
tp != NLA_REJECT && \
tp != NLA_NESTED && \
tp != NLA_NESTED_ARRAY) + tp)
#define NLA_ENSURE_BEINT_TYPE(tp) \
(__NLA_ENSURE(__NLA_IS_BEINT_TYPE(tp)) + tp)
#define NLA_POLICY_RANGE(tp, _min, _max) { \
.type = NLA_ENSURE_INT_OR_BINARY_TYPE(tp), \

6
lib/nlattr.c
View File

@ -355,6 +355,12 @@ static int nla_validate_mask(const struct nla_policy *pt,
case NLA_U64:
value = nla_get_u64(nla);
break;
case NLA_BE16:
value = ntohs(nla_get_be16(nla));
break;
case NLA_BE32:
value = ntohl(nla_get_be32(nla));
break;
default:
return -EINVAL;
}