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linux/net/ethtool/bitset.c
Michal Kubecek a770bf5156 ethtool: fix stack overflow in ethnl_parse_bitset() 
Syzbot reported a stack overflow in bitmap_from_arr32() called from
ethnl_parse_bitset() when bitset from netlink message is longer than
target bitmap length. While ethnl_compact_sanity_checks() makes sure that
trailing part is all zeros (i.e. the request does not try to touch bits
kernel does not recognize), we also need to cap change_bits to nbits so
that we don't try to write past the prepared bitmaps.

Fixes: 88db6d1e4f ("ethtool: add ethnl_parse_bitset() helper")
Reported-by: syzbot+9d39fa49d4df294aab93@syzkaller.appspotmail.com
Signed-off-by: Michal Kubecek <mkubecek@suse.cz>
Link: https://lore.kernel.org/r/3487ee3a98e14cd526f55b6caaa959d2dcbcad9f.1607465316.git.mkubecek@suse.cz
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2020-12-09 15:50:38 -08:00

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// SPDX-License-Identifier: GPL-2.0-only
#include <linux/ethtool_netlink.h>
#include <linux/bitmap.h>
#include "netlink.h"
#include "bitset.h"
/* Some bitmaps are internally represented as an array of unsigned long, some
* as an array of u32 (some even as single u32 for now). To avoid the need of
* wrappers on caller side, we provide two set of functions: those with "32"
* suffix in their names expect u32 based bitmaps, those without it expect
* unsigned long bitmaps.
*/
static u32 ethnl_lower_bits(unsigned int n)
{
return ~(u32)0 >> (32 - n % 32);
}
static u32 ethnl_upper_bits(unsigned int n)
{
return ~(u32)0 << (n % 32);
}
/**
* ethnl_bitmap32_clear() - Clear u32 based bitmap
* @dst: bitmap to clear
* @start: beginning of the interval
* @end: end of the interval
* @mod: set if bitmap was modified
*
* Clear @nbits bits of a bitmap with indices @start <= i < @end
*/
static void ethnl_bitmap32_clear(u32 *dst, unsigned int start, unsigned int end,
bool *mod)
{
unsigned int start_word = start / 32;
unsigned int end_word = end / 32;
unsigned int i;
u32 mask;
if (end <= start)
return;
if (start % 32) {
mask = ethnl_upper_bits(start);
if (end_word == start_word) {
mask &= ethnl_lower_bits(end);
if (dst[start_word] & mask) {
dst[start_word] &= ~mask;
*mod = true;
}
return;
}
if (dst[start_word] & mask) {
dst[start_word] &= ~mask;
*mod = true;
}
start_word++;
}
for (i = start_word; i < end_word; i++) {
if (dst[i]) {
dst[i] = 0;
*mod = true;
}
}
if (end % 32) {
mask = ethnl_lower_bits(end);
if (dst[end_word] & mask) {
dst[end_word] &= ~mask;
*mod = true;
}
}
}
/**
* ethnl_bitmap32_not_zero() - Check if any bit is set in an interval
* @map: bitmap to test
* @start: beginning of the interval
* @end: end of the interval
*
* Return: true if there is non-zero bit with index @start <= i < @end,
* false if the whole interval is zero
*/
static bool ethnl_bitmap32_not_zero(const u32 *map, unsigned int start,
unsigned int end)
{
unsigned int start_word = start / 32;
unsigned int end_word = end / 32;
u32 mask;
if (end <= start)
return true;
if (start % 32) {
mask = ethnl_upper_bits(start);
if (end_word == start_word) {
mask &= ethnl_lower_bits(end);
return map[start_word] & mask;
}
if (map[start_word] & mask)
return true;
start_word++;
}
if (!memchr_inv(map + start_word, '\0',
(end_word - start_word) * sizeof(u32)))
return true;
if (end % 32 == 0)
return true;
return map[end_word] & ethnl_lower_bits(end);
}
/**
* ethnl_bitmap32_update() - Modify u32 based bitmap according to value/mask
* pair
* @dst: bitmap to update
* @nbits: bit size of the bitmap
* @value: values to set
* @mask: mask of bits to set
* @mod: set to true if bitmap is modified, preserve if not
*
* Set bits in @dst bitmap which are set in @mask to values from @value, leave
* the rest untouched. If destination bitmap was modified, set @mod to true,
* leave as it is if not.
*/
static void ethnl_bitmap32_update(u32 *dst, unsigned int nbits,
const u32 *value, const u32 *mask, bool *mod)
{
while (nbits > 0) {
u32 real_mask = mask ? *mask : ~(u32)0;
u32 new_value;
if (nbits < 32)
real_mask &= ethnl_lower_bits(nbits);
new_value = (*dst & ~real_mask) | (*value & real_mask);
if (new_value != *dst) {
*dst = new_value;
*mod = true;
}
if (nbits <= 32)
break;
dst++;
nbits -= 32;
value++;
if (mask)
mask++;
}
}
static bool ethnl_bitmap32_test_bit(const u32 *map, unsigned int index)
{
return map[index / 32] & (1U << (index % 32));
}
/**
* ethnl_bitset32_size() - Calculate size of bitset nested attribute
* @val: value bitmap (u32 based)
* @mask: mask bitmap (u32 based, optional)
* @nbits: bit length of the bitset
* @names: array of bit names (optional)
* @compact: assume compact format for output
*
* Estimate length of netlink attribute composed by a later call to
* ethnl_put_bitset32() call with the same arguments.
*
* Return: negative error code or attribute length estimate
*/
int ethnl_bitset32_size(const u32 *val, const u32 *mask, unsigned int nbits,
ethnl_string_array_t names, bool compact)
{
unsigned int len = 0;
/* list flag */
if (!mask)
len += nla_total_size(sizeof(u32));
/* size */
len += nla_total_size(sizeof(u32));
if (compact) {
unsigned int nwords = DIV_ROUND_UP(nbits, 32);
/* value, mask */
len += (mask ? 2 : 1) * nla_total_size(nwords * sizeof(u32));
} else {
unsigned int bits_len = 0;
unsigned int bit_len, i;
for (i = 0; i < nbits; i++) {
const char *name = names ? names[i] : NULL;
if (!ethnl_bitmap32_test_bit(mask ?: val, i))
continue;
/* index */
bit_len = nla_total_size(sizeof(u32));
/* name */
if (name)
bit_len += ethnl_strz_size(name);
/* value */
if (mask && ethnl_bitmap32_test_bit(val, i))
bit_len += nla_total_size(0);
/* bit nest */
bits_len += nla_total_size(bit_len);
}
/* bits nest */
len += nla_total_size(bits_len);
}
/* outermost nest */
return nla_total_size(len);
}
/**
* ethnl_put_bitset32() - Put a bitset nest into a message
* @skb: skb with the message
* @attrtype: attribute type for the bitset nest
* @val: value bitmap (u32 based)
* @mask: mask bitmap (u32 based, optional)
* @nbits: bit length of the bitset
* @names: array of bit names (optional)
* @compact: use compact format for the output
*
* Compose a nested attribute representing a bitset. If @mask is null, simple
* bitmap (bit list) is created, if @mask is provided, represent a value/mask
* pair. Bit names are only used in verbose mode and when provided by calller.
*
* Return: 0 on success, negative error value on error
*/
int ethnl_put_bitset32(struct sk_buff *skb, int attrtype, const u32 *val,
const u32 *mask, unsigned int nbits,
ethnl_string_array_t names, bool compact)
{
struct nlattr *nest;
struct nlattr *attr;
nest = nla_nest_start(skb, attrtype);
if (!nest)
return -EMSGSIZE;
if (!mask && nla_put_flag(skb, ETHTOOL_A_BITSET_NOMASK))
goto nla_put_failure;
if (nla_put_u32(skb, ETHTOOL_A_BITSET_SIZE, nbits))
goto nla_put_failure;
if (compact) {
unsigned int nwords = DIV_ROUND_UP(nbits, 32);
unsigned int nbytes = nwords * sizeof(u32);
u32 *dst;
attr = nla_reserve(skb, ETHTOOL_A_BITSET_VALUE, nbytes);
if (!attr)
goto nla_put_failure;
dst = nla_data(attr);
memcpy(dst, val, nbytes);
if (nbits % 32)
dst[nwords - 1] &= ethnl_lower_bits(nbits);
if (mask) {
attr = nla_reserve(skb, ETHTOOL_A_BITSET_MASK, nbytes);
if (!attr)
goto nla_put_failure;
dst = nla_data(attr);
memcpy(dst, mask, nbytes);
if (nbits % 32)
dst[nwords - 1] &= ethnl_lower_bits(nbits);
}
} else {
struct nlattr *bits;
unsigned int i;
bits = nla_nest_start(skb, ETHTOOL_A_BITSET_BITS);
if (!bits)
goto nla_put_failure;
for (i = 0; i < nbits; i++) {
const char *name = names ? names[i] : NULL;
if (!ethnl_bitmap32_test_bit(mask ?: val, i))
continue;
attr = nla_nest_start(skb, ETHTOOL_A_BITSET_BITS_BIT);
if (!attr)
goto nla_put_failure;
if (nla_put_u32(skb, ETHTOOL_A_BITSET_BIT_INDEX, i))
goto nla_put_failure;
if (name &&
ethnl_put_strz(skb, ETHTOOL_A_BITSET_BIT_NAME, name))
goto nla_put_failure;
if (mask && ethnl_bitmap32_test_bit(val, i) &&
nla_put_flag(skb, ETHTOOL_A_BITSET_BIT_VALUE))
goto nla_put_failure;
nla_nest_end(skb, attr);
}
nla_nest_end(skb, bits);
}
nla_nest_end(skb, nest);
return 0;
nla_put_failure:
nla_nest_cancel(skb, nest);
return -EMSGSIZE;
}
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),
[ETHTOOL_A_BITSET_BITS] = { .type = NLA_NESTED },
[ETHTOOL_A_BITSET_VALUE] = { .type = NLA_BINARY },
[ETHTOOL_A_BITSET_MASK] = { .type = NLA_BINARY },
};
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 },
};
/**
* ethnl_bitset_is_compact() - check if bitset attribute represents a compact
* bitset
* @bitset: nested attribute representing a bitset
* @compact: pointer for return value
*
* Return: 0 on success, negative error code on failure
*/
int ethnl_bitset_is_compact(const struct nlattr *bitset, bool *compact)
{
struct nlattr *tb[ARRAY_SIZE(bitset_policy)];
int ret;
ret = nla_parse_nested(tb, ARRAY_SIZE(bitset_policy) - 1, bitset,
bitset_policy, NULL);
if (ret < 0)
return ret;
if (tb[ETHTOOL_A_BITSET_BITS]) {
if (tb[ETHTOOL_A_BITSET_VALUE] || tb[ETHTOOL_A_BITSET_MASK])
return -EINVAL;
*compact = false;
return 0;
}
if (!tb[ETHTOOL_A_BITSET_SIZE] || !tb[ETHTOOL_A_BITSET_VALUE])
return -EINVAL;
*compact = true;
return 0;
}
/**
* ethnl_name_to_idx() - look up string index for a name
* @names: array of ETH_GSTRING_LEN sized strings
* @n_names: number of strings in the array
* @name: name to look up
*
* Return: index of the string if found, -ENOENT if not found
*/
static int ethnl_name_to_idx(ethnl_string_array_t names, unsigned int n_names,
const char *name)
{
unsigned int i;
if (!names)
return -ENOENT;
for (i = 0; i < n_names; i++) {
/* names[i] may not be null terminated */
if (!strncmp(names[i], name, ETH_GSTRING_LEN) &&
strlen(name) <= ETH_GSTRING_LEN)
return i;
}
return -ENOENT;
}
static int ethnl_parse_bit(unsigned int *index, bool *val, unsigned int nbits,
const struct nlattr *bit_attr, bool no_mask,
ethnl_string_array_t names,
struct netlink_ext_ack *extack)
{
struct nlattr *tb[ARRAY_SIZE(bit_policy)];
int ret, idx;
ret = nla_parse_nested(tb, ARRAY_SIZE(bit_policy) - 1, bit_attr,
bit_policy, extack);
if (ret < 0)
return ret;
if (tb[ETHTOOL_A_BITSET_BIT_INDEX]) {
const char *name;
idx = nla_get_u32(tb[ETHTOOL_A_BITSET_BIT_INDEX]);
if (idx >= nbits) {
NL_SET_ERR_MSG_ATTR(extack,
tb[ETHTOOL_A_BITSET_BIT_INDEX],
"bit index too high");
return -EOPNOTSUPP;
}
name = names ? names[idx] : NULL;
if (tb[ETHTOOL_A_BITSET_BIT_NAME] && name &&
strncmp(nla_data(tb[ETHTOOL_A_BITSET_BIT_NAME]), name,
nla_len(tb[ETHTOOL_A_BITSET_BIT_NAME]))) {
NL_SET_ERR_MSG_ATTR(extack, bit_attr,
"bit index and name mismatch");
return -EINVAL;
}
} else if (tb[ETHTOOL_A_BITSET_BIT_NAME]) {
idx = ethnl_name_to_idx(names, nbits,
nla_data(tb[ETHTOOL_A_BITSET_BIT_NAME]));
if (idx < 0) {
NL_SET_ERR_MSG_ATTR(extack,
tb[ETHTOOL_A_BITSET_BIT_NAME],
"bit name not found");
return -EOPNOTSUPP;
}
} else {
NL_SET_ERR_MSG_ATTR(extack, bit_attr,
"neither bit index nor name specified");
return -EINVAL;
}
*index = idx;
*val = no_mask || tb[ETHTOOL_A_BITSET_BIT_VALUE];
return 0;
}
static int
ethnl_update_bitset32_verbose(u32 *bitmap, unsigned int nbits,
const struct nlattr *attr, struct nlattr **tb,
ethnl_string_array_t names,
struct netlink_ext_ack *extack, bool *mod)
{
struct nlattr *bit_attr;
bool no_mask;
int rem;
int ret;
if (tb[ETHTOOL_A_BITSET_VALUE]) {
NL_SET_ERR_MSG_ATTR(extack, tb[ETHTOOL_A_BITSET_VALUE],
"value only allowed in compact bitset");
return -EINVAL;
}
if (tb[ETHTOOL_A_BITSET_MASK]) {
NL_SET_ERR_MSG_ATTR(extack, tb[ETHTOOL_A_BITSET_MASK],
"mask only allowed in compact bitset");
return -EINVAL;
}
no_mask = tb[ETHTOOL_A_BITSET_NOMASK];
if (no_mask)
ethnl_bitmap32_clear(bitmap, 0, nbits, mod);
nla_for_each_nested(bit_attr, tb[ETHTOOL_A_BITSET_BITS], rem) {
bool old_val, new_val;
unsigned int idx;
if (nla_type(bit_attr) != ETHTOOL_A_BITSET_BITS_BIT) {
NL_SET_ERR_MSG_ATTR(extack, bit_attr,
"only ETHTOOL_A_BITSET_BITS_BIT allowed in ETHTOOL_A_BITSET_BITS");
return -EINVAL;
}
ret = ethnl_parse_bit(&idx, &new_val, nbits, bit_attr, no_mask,
names, extack);
if (ret < 0)
return ret;
old_val = bitmap[idx / 32] & ((u32)1 << (idx % 32));
if (new_val != old_val) {
if (new_val)
bitmap[idx / 32] |= ((u32)1 << (idx % 32));
else
bitmap[idx / 32] &= ~((u32)1 << (idx % 32));
*mod = true;
}
}
return 0;
}
static int ethnl_compact_sanity_checks(unsigned int nbits,
const struct nlattr *nest,
struct nlattr **tb,
struct netlink_ext_ack *extack)
{
bool no_mask = tb[ETHTOOL_A_BITSET_NOMASK];
unsigned int attr_nbits, attr_nwords;
const struct nlattr *test_attr;
if (no_mask && tb[ETHTOOL_A_BITSET_MASK]) {
NL_SET_ERR_MSG_ATTR(extack, tb[ETHTOOL_A_BITSET_MASK],
"mask not allowed in list bitset");
return -EINVAL;
}
if (!tb[ETHTOOL_A_BITSET_SIZE]) {
NL_SET_ERR_MSG_ATTR(extack, nest,
"missing size in compact bitset");
return -EINVAL;
}
if (!tb[ETHTOOL_A_BITSET_VALUE]) {
NL_SET_ERR_MSG_ATTR(extack, nest,
"missing value in compact bitset");
return -EINVAL;
}
if (!no_mask && !tb[ETHTOOL_A_BITSET_MASK]) {
NL_SET_ERR_MSG_ATTR(extack, nest,
"missing mask in compact nonlist bitset");
return -EINVAL;
}
attr_nbits = nla_get_u32(tb[ETHTOOL_A_BITSET_SIZE]);
attr_nwords = DIV_ROUND_UP(attr_nbits, 32);
if (nla_len(tb[ETHTOOL_A_BITSET_VALUE]) != attr_nwords * sizeof(u32)) {
NL_SET_ERR_MSG_ATTR(extack, tb[ETHTOOL_A_BITSET_VALUE],
"bitset value length does not match size");
return -EINVAL;
}
if (tb[ETHTOOL_A_BITSET_MASK] &&
nla_len(tb[ETHTOOL_A_BITSET_MASK]) != attr_nwords * sizeof(u32)) {
NL_SET_ERR_MSG_ATTR(extack, tb[ETHTOOL_A_BITSET_MASK],
"bitset mask length does not match size");
return -EINVAL;
}
if (attr_nbits <= nbits)
return 0;
test_attr = no_mask ? tb[ETHTOOL_A_BITSET_VALUE] :
tb[ETHTOOL_A_BITSET_MASK];
if (ethnl_bitmap32_not_zero(nla_data(test_attr), nbits, attr_nbits)) {
NL_SET_ERR_MSG_ATTR(extack, test_attr,
"cannot modify bits past kernel bitset size");
return -EINVAL;
}
return 0;
}
/**
* ethnl_update_bitset32() - Apply a bitset nest to a u32 based bitmap
* @bitmap: bitmap to update
* @nbits: size of the updated bitmap in bits
* @attr: nest attribute to parse and apply
* @names: array of bit names; may be null for compact format
* @extack: extack for error reporting
* @mod: set this to true if bitmap is modified, leave as it is if not
*
* Apply bitset netsted attribute to a bitmap. If the attribute represents
* a bit list, @bitmap is set to its contents; otherwise, bits in mask are
* set to values from value. Bitmaps in the attribute may be longer than
* @nbits but the message must not request modifying any bits past @nbits.
*
* Return: negative error code on failure, 0 on success
*/
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[ARRAY_SIZE(bitset_policy)];
unsigned int change_bits;
bool no_mask;
int ret;
if (!attr)
return 0;
ret = nla_parse_nested(tb, ARRAY_SIZE(bitset_policy) - 1, attr,
bitset_policy, extack);
if (ret < 0)
return ret;
if (tb[ETHTOOL_A_BITSET_BITS])
return ethnl_update_bitset32_verbose(bitmap, nbits, attr, tb,
names, extack, mod);
ret = ethnl_compact_sanity_checks(nbits, attr, tb, extack);
if (ret < 0)
return ret;
no_mask = tb[ETHTOOL_A_BITSET_NOMASK];
change_bits = min_t(unsigned int,
nla_get_u32(tb[ETHTOOL_A_BITSET_SIZE]), nbits);
ethnl_bitmap32_update(bitmap, change_bits,
nla_data(tb[ETHTOOL_A_BITSET_VALUE]),
no_mask ? NULL :
nla_data(tb[ETHTOOL_A_BITSET_MASK]),
mod);
if (no_mask && change_bits < nbits)
ethnl_bitmap32_clear(bitmap, change_bits, nbits, mod);
return 0;
}
/**
* ethnl_parse_bitset() - Compute effective value and mask from bitset nest
* @val: unsigned long based bitmap to put value into
* @mask: unsigned long based bitmap to put mask into
* @nbits: size of @val and @mask bitmaps
* @attr: nest attribute to parse and apply
* @names: array of bit names; may be null for compact format
* @extack: extack for error reporting
*
* Provide @nbits size long bitmaps for value and mask so that
* x = (val & mask) | (x & ~mask) would modify any @nbits sized bitmap x
* the same way ethnl_update_bitset() with the same bitset attribute would.
*
* Return: negative error code on failure, 0 on success
*/
int ethnl_parse_bitset(unsigned long *val, unsigned long *mask,
unsigned int nbits, const struct nlattr *attr,
ethnl_string_array_t names,
struct netlink_ext_ack *extack)
{
struct nlattr *tb[ARRAY_SIZE(bitset_policy)];
const struct nlattr *bit_attr;
bool no_mask;
int rem;
int ret;
if (!attr)
return 0;
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];
if (!tb[ETHTOOL_A_BITSET_BITS]) {
unsigned int change_bits;
ret = ethnl_compact_sanity_checks(nbits, attr, tb, extack);
if (ret < 0)
return ret;
change_bits = nla_get_u32(tb[ETHTOOL_A_BITSET_SIZE]);
if (change_bits > nbits)
change_bits = nbits;
bitmap_from_arr32(val, nla_data(tb[ETHTOOL_A_BITSET_VALUE]),
change_bits);
if (change_bits < nbits)
bitmap_clear(val, change_bits, nbits - change_bits);
if (no_mask) {
bitmap_fill(mask, nbits);
} else {
bitmap_from_arr32(mask,
nla_data(tb[ETHTOOL_A_BITSET_MASK]),
change_bits);
if (change_bits < nbits)
bitmap_clear(mask, change_bits,
nbits - change_bits);
}
return 0;
}
if (tb[ETHTOOL_A_BITSET_VALUE]) {
NL_SET_ERR_MSG_ATTR(extack, tb[ETHTOOL_A_BITSET_VALUE],
"value only allowed in compact bitset");
return -EINVAL;
}
if (tb[ETHTOOL_A_BITSET_MASK]) {
NL_SET_ERR_MSG_ATTR(extack, tb[ETHTOOL_A_BITSET_MASK],
"mask only allowed in compact bitset");
return -EINVAL;
}
bitmap_zero(val, nbits);
if (no_mask)
bitmap_fill(mask, nbits);
else
bitmap_zero(mask, nbits);
nla_for_each_nested(bit_attr, tb[ETHTOOL_A_BITSET_BITS], rem) {
unsigned int idx;
bool bit_val;
ret = ethnl_parse_bit(&idx, &bit_val, nbits, bit_attr, no_mask,
names, extack);
if (ret < 0)
return ret;
if (bit_val)
__set_bit(idx, val);
if (!no_mask)
__set_bit(idx, mask);
}
return 0;
}
#if BITS_PER_LONG == 64 && defined(__BIG_ENDIAN)
/* 64-bit big endian architectures are the only case when u32 based bitmaps
* and unsigned long based bitmaps have different memory layout so that we
* cannot simply cast the latter to the former and need actual wrappers
* converting the latter to the former.
*
* To reduce the number of slab allocations, the wrappers use fixed size local
* variables for bitmaps up to ETHNL_SMALL_BITMAP_BITS bits which is the
* majority of bitmaps used by ethtool.
*/
#define ETHNL_SMALL_BITMAP_BITS 128
#define ETHNL_SMALL_BITMAP_WORDS DIV_ROUND_UP(ETHNL_SMALL_BITMAP_BITS, 32)
int ethnl_bitset_size(const unsigned long *val, const unsigned long *mask,
unsigned int nbits, ethnl_string_array_t names,
bool compact)
{
u32 small_mask32[ETHNL_SMALL_BITMAP_WORDS];
u32 small_val32[ETHNL_SMALL_BITMAP_WORDS];
u32 *mask32;
u32 *val32;
int ret;
if (nbits > ETHNL_SMALL_BITMAP_BITS) {
unsigned int nwords = DIV_ROUND_UP(nbits, 32);
val32 = kmalloc_array(2 * nwords, sizeof(u32), GFP_KERNEL);
if (!val32)
return -ENOMEM;
mask32 = val32 + nwords;
} else {
val32 = small_val32;
mask32 = small_mask32;
}
bitmap_to_arr32(val32, val, nbits);
if (mask)
bitmap_to_arr32(mask32, mask, nbits);
else
mask32 = NULL;
ret = ethnl_bitset32_size(val32, mask32, nbits, names, compact);
if (nbits > ETHNL_SMALL_BITMAP_BITS)
kfree(val32);
return ret;
}
int ethnl_put_bitset(struct sk_buff *skb, int attrtype,
const unsigned long *val, const unsigned long *mask,
unsigned int nbits, ethnl_string_array_t names,
bool compact)
{
u32 small_mask32[ETHNL_SMALL_BITMAP_WORDS];
u32 small_val32[ETHNL_SMALL_BITMAP_WORDS];
u32 *mask32;
u32 *val32;
int ret;
if (nbits > ETHNL_SMALL_BITMAP_BITS) {
unsigned int nwords = DIV_ROUND_UP(nbits, 32);
val32 = kmalloc_array(2 * nwords, sizeof(u32), GFP_KERNEL);
if (!val32)
return -ENOMEM;
mask32 = val32 + nwords;
} else {
val32 = small_val32;
mask32 = small_mask32;
}
bitmap_to_arr32(val32, val, nbits);
if (mask)
bitmap_to_arr32(mask32, mask, nbits);
else
mask32 = NULL;
ret = ethnl_put_bitset32(skb, attrtype, val32, mask32, nbits, names,
compact);
if (nbits > ETHNL_SMALL_BITMAP_BITS)
kfree(val32);
return ret;
}
int ethnl_update_bitset(unsigned long *bitmap, unsigned int nbits,
const struct nlattr *attr, ethnl_string_array_t names,
struct netlink_ext_ack *extack, bool *mod)
{
u32 small_bitmap32[ETHNL_SMALL_BITMAP_WORDS];
u32 *bitmap32 = small_bitmap32;
bool u32_mod = false;
int ret;
if (nbits > ETHNL_SMALL_BITMAP_BITS) {
unsigned int dst_words = DIV_ROUND_UP(nbits, 32);
bitmap32 = kmalloc_array(dst_words, sizeof(u32), GFP_KERNEL);
if (!bitmap32)
return -ENOMEM;
}
bitmap_to_arr32(bitmap32, bitmap, nbits);
ret = ethnl_update_bitset32(bitmap32, nbits, attr, names, extack,
&u32_mod);
if (u32_mod) {
bitmap_from_arr32(bitmap, bitmap32, nbits);
*mod = true;
}
if (nbits > ETHNL_SMALL_BITMAP_BITS)
kfree(bitmap32);
return ret;
}
#else
/* On little endian 64-bit and all 32-bit architectures, an unsigned long
* based bitmap can be interpreted as u32 based one using a simple cast.
*/
int ethnl_bitset_size(const unsigned long *val, const unsigned long *mask,
unsigned int nbits, ethnl_string_array_t names,
bool compact)
{
return ethnl_bitset32_size((const u32 *)val, (const u32 *)mask, nbits,
names, compact);
}
int ethnl_put_bitset(struct sk_buff *skb, int attrtype,
const unsigned long *val, const unsigned long *mask,
unsigned int nbits, ethnl_string_array_t names,
bool compact)
{
return ethnl_put_bitset32(skb, attrtype, (const u32 *)val,
(const u32 *)mask, nbits, names, compact);
}
int ethnl_update_bitset(unsigned long *bitmap, unsigned int nbits,
const struct nlattr *attr, ethnl_string_array_t names,
struct netlink_ext_ack *extack, bool *mod)
{
return ethnl_update_bitset32((u32 *)bitmap, nbits, attr, names, extack,
mod);
}
#endif /* BITS_PER_LONG == 64 && defined(__BIG_ENDIAN) */
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