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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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