Commit 2c28ae48 authored by Johannes Berg's avatar Johannes Berg Committed by David S. Miller
Browse files

netlink: factor out policy range helpers 



Add helpers to get the policy's signed/unsigned range
validation data.

Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent c7721c05

include/net/netlink.h

+5 −0
Original line number Diff line number Diff line
@@ -1928,4 +1928,9 @@ static inline bool nla_is_last(const struct nlattr *nla, int rem) 
	return nla->nla_len == rem;

}



void nla_get_range_unsigned(const struct nla_policy *pt,

			    struct netlink_range_validation *range);

void nla_get_range_signed(const struct nla_policy *pt,

			  struct netlink_range_validation_signed *range);



#endif

lib/nlattr.c

+74 −21
Original line number Diff line number Diff line
@@ -111,26 +111,40 @@ static int nla_validate_array(const struct nlattr *head, int len, int maxtype, 
	return 0;

}



static int nla_validate_int_range_unsigned(const struct nla_policy *pt,

					   const struct nlattr *nla,

					   struct netlink_ext_ack *extack)

void nla_get_range_unsigned(const struct nla_policy *pt,

			    struct netlink_range_validation *range)

{

	struct netlink_range_validation _range = {

		.min = 0,

		.max = U64_MAX,

	}, *range = &_range;

	u64 value;



	WARN_ON_ONCE(pt->validation_type != NLA_VALIDATE_RANGE_PTR &&

		     (pt->min < 0 || pt->max < 0));



	range->min = 0;



	switch (pt->type) {

	case NLA_U8:

		range->max = U8_MAX;

		break;

	case NLA_U16:

		range->max = U16_MAX;

		break;

	case NLA_U32:

		range->max = U32_MAX;

		break;

	case NLA_U64:

	case NLA_MSECS:

		range->max = U64_MAX;

		break;

	default:

		WARN_ON_ONCE(1);

		return;

	}



	switch (pt->validation_type) {

	case NLA_VALIDATE_RANGE:

		range->min = pt->min;

		range->max = pt->max;

		break;

	case NLA_VALIDATE_RANGE_PTR:

		range = pt->range;

		*range = *pt->range;

		break;

	case NLA_VALIDATE_MIN:

		range->min = pt->min;
@@ -138,7 +152,17 @@ static int nla_validate_int_range_unsigned(const struct nla_policy *pt, 
	case NLA_VALIDATE_MAX:

		range->max = pt->max;

		break;

	default:

		break;

	}

}



static int nla_validate_int_range_unsigned(const struct nla_policy *pt,

					   const struct nlattr *nla,

					   struct netlink_ext_ack *extack)

{

	struct netlink_range_validation range;

	u64 value;



	switch (pt->type) {

	case NLA_U8:
@@ -158,7 +182,9 @@ static int nla_validate_int_range_unsigned(const struct nla_policy *pt, 
		return -EINVAL;

	}



	if (value < range->min || value > range->max) {

	nla_get_range_unsigned(pt, &range);



	if (value < range.min || value > range.max) {

		NL_SET_ERR_MSG_ATTR(extack, nla,

				    "integer out of range");

		return -ERANGE;
@@ -167,15 +193,30 @@ static int nla_validate_int_range_unsigned(const struct nla_policy *pt, 
	return 0;

}



static int nla_validate_int_range_signed(const struct nla_policy *pt,

					 const struct nlattr *nla,

					 struct netlink_ext_ack *extack)

void nla_get_range_signed(const struct nla_policy *pt,

			  struct netlink_range_validation_signed *range)

{

	struct netlink_range_validation_signed _range = {

		.min = S64_MIN,

		.max = S64_MAX,

	}, *range = &_range;

	s64 value;

	switch (pt->type) {

	case NLA_S8:

		range->min = S8_MIN;

		range->max = S8_MAX;

		break;

	case NLA_S16:

		range->min = S16_MIN;

		range->max = S16_MAX;

		break;

	case NLA_S32:

		range->min = S32_MIN;

		range->max = S32_MAX;

		break;

	case NLA_S64:

		range->min = S64_MIN;

		range->max = S64_MAX;

		break;

	default:

		WARN_ON_ONCE(1);

		return;

	}



	switch (pt->validation_type) {

	case NLA_VALIDATE_RANGE:
@@ -183,7 +224,7 @@ static int nla_validate_int_range_signed(const struct nla_policy *pt, 
		range->max = pt->max;

		break;

	case NLA_VALIDATE_RANGE_PTR:

		range = pt->range_signed;

		*range = *pt->range_signed;

		break;

	case NLA_VALIDATE_MIN:

		range->min = pt->min;
@@ -191,8 +232,18 @@ static int nla_validate_int_range_signed(const struct nla_policy *pt, 
	case NLA_VALIDATE_MAX:

		range->max = pt->max;

		break;

	default:

		break;

	}

}



static int nla_validate_int_range_signed(const struct nla_policy *pt,

					 const struct nlattr *nla,

					 struct netlink_ext_ack *extack)

{

	struct netlink_range_validation_signed range;

	s64 value;



	switch (pt->type) {

	case NLA_S8:

		value = nla_get_s8(nla);
@@ -210,7 +261,9 @@ static int nla_validate_int_range_signed(const struct nla_policy *pt, 
		return -EINVAL;

	}



	if (value < range->min || value > range->max) {

	nla_get_range_signed(pt, &range);



	if (value < range.min || value > range.max) {

		NL_SET_ERR_MSG_ATTR(extack, nla,

				    "integer out of range");

		return -ERANGE;

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