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netlink: add mask validation

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We don't have good validation policy for existing unsigned int attrs
which serve as flags (for new ones we could use NLA_BITFIELD32).
With increased use of policy dumping having the validation be
expressed as part of the policy is important. Add validation
policy in form of a mask of supported/valid bits.

Support u64 in the uAPI to be future-proof, but really for now
the embedded mask member can only hold 32 bits, so anything with
bit 32+ set will always fail validation.

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 15:07:38 -07:00
committed by David S. Miller
parent ddcf3b70c5
commit bdbb4e29df
4 changed files with 56 additions and 0 deletions
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10
include/net/netlink.h
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@@ -200,6 +200,7 @@ enum nla_policy_validation {
NLA_VALIDATE_RANGE_WARN_TOO_LONG,
NLA_VALIDATE_MIN,
NLA_VALIDATE_MAX,
NLA_VALIDATE_MASK,
NLA_VALIDATE_RANGE_PTR,
NLA_VALIDATE_FUNCTION,
};
@@ -317,6 +318,7 @@ struct nla_policy {
u16 len;
union {
const u32 bitfield32_valid;
const u32 mask;
const char *reject_message;
const struct nla_policy *nested_policy;
struct netlink_range_validation *range;
@@ -368,6 +370,8 @@ struct nla_policy {
(tp == NLA_S8 || tp == NLA_S16 || tp == NLA_S32 || tp == NLA_S64)
#define __NLA_ENSURE(condition) BUILD_BUG_ON_ZERO(!(condition))
#define NLA_ENSURE_UINT_TYPE(tp) \
(__NLA_ENSURE(__NLA_IS_UINT_TYPE(tp)) + tp)
#define NLA_ENSURE_UINT_OR_BINARY_TYPE(tp) \
(__NLA_ENSURE(__NLA_IS_UINT_TYPE(tp) || \
tp == NLA_MSECS || \
@@ -416,6 +420,12 @@ struct nla_policy {
.max = _max, \
}
#define NLA_POLICY_MASK(tp, _mask) { \
.type = NLA_ENSURE_UINT_TYPE(tp), \
.validation_type = NLA_VALIDATE_MASK, \
.mask = _mask, \
}
#define NLA_POLICY_VALIDATE_FN(tp, fn, ...) { \
.type = NLA_ENSURE_NO_VALIDATION_PTR(tp), \
.validation_type = NLA_VALIDATE_FUNCTION, \