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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-27 19:29:37 +00:00
![Linus Torvalds](/assets/img/avatar_default.png)
Hi Linus,
Please, pull the following patches that fix many fall-through warnings
when building with Clang 12.0.0 and this[1] change reverted. Notice
that in order to enable -Wimplicit-fallthrough for Clang, such change[1]
is meant to be reverted at some point. So, these patches help to move
in that direction.
- powerpc: boot: include compiler_attributes.h (Nick Desaulniers)
- Revert "lib: Revert use of fallthrough pseudo-keyword in lib/" (Nick Desaulniers)
- powerpc: fix -Wimplicit-fallthrough (Nick Desaulniers)
- lib: Fix fall-through warnings for Clang (Gustavo A. R. Silva)
Thanks!
[1] commit e2079e93f5
("kbuild: Do not enable -Wimplicit-fallthrough for clang for now")
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Merge tag 'fallthrough-fixes-clang-5.11-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gustavoars/linux
Pull fallthrough fixes from Gustavo A. R. Silva:
"Fix many fall-through warnings when building with Clang 12.0.0
using -Wimplicit-fallthrough.
- powerpc: boot: include compiler_attributes.h (Nick Desaulniers)
- Revert "lib: Revert use of fallthrough pseudo-keyword in lib/"
(Nick Desaulniers)
- powerpc: fix -Wimplicit-fallthrough (Nick Desaulniers)
- lib: Fix fall-through warnings for Clang (Gustavo A. R. Silva)"
* tag 'fallthrough-fixes-clang-5.11-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gustavoars/linux:
lib: Fix fall-through warnings for Clang
powerpc: fix -Wimplicit-fallthrough
Revert "lib: Revert use of fallthrough pseudo-keyword in lib/"
powerpc: boot: include compiler_attributes.h
1122 lines
27 KiB
C
1122 lines
27 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
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* NETLINK Netlink attributes
|
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*
|
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* Authors: Thomas Graf <tgraf@suug.ch>
|
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* Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
|
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*/
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#include <linux/export.h>
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/jiffies.h>
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#include <linux/skbuff.h>
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#include <linux/string.h>
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#include <linux/types.h>
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#include <net/netlink.h>
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/* For these data types, attribute length should be exactly the given
|
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* size. However, to maintain compatibility with broken commands, if the
|
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* attribute length does not match the expected size a warning is emitted
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* to the user that the command is sending invalid data and needs to be fixed.
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*/
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static const u8 nla_attr_len[NLA_TYPE_MAX+1] = {
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[NLA_U8] = sizeof(u8),
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[NLA_U16] = sizeof(u16),
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[NLA_U32] = sizeof(u32),
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[NLA_U64] = sizeof(u64),
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[NLA_S8] = sizeof(s8),
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[NLA_S16] = sizeof(s16),
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[NLA_S32] = sizeof(s32),
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[NLA_S64] = sizeof(s64),
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};
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static const u8 nla_attr_minlen[NLA_TYPE_MAX+1] = {
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[NLA_U8] = sizeof(u8),
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[NLA_U16] = sizeof(u16),
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[NLA_U32] = sizeof(u32),
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[NLA_U64] = sizeof(u64),
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[NLA_MSECS] = sizeof(u64),
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[NLA_NESTED] = NLA_HDRLEN,
|
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[NLA_S8] = sizeof(s8),
|
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[NLA_S16] = sizeof(s16),
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[NLA_S32] = sizeof(s32),
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[NLA_S64] = sizeof(s64),
|
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};
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|
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/*
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* Nested policies might refer back to the original
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* policy in some cases, and userspace could try to
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* abuse that and recurse by nesting in the right
|
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* ways. Limit recursion to avoid this problem.
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*/
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#define MAX_POLICY_RECURSION_DEPTH 10
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static int __nla_validate_parse(const struct nlattr *head, int len, int maxtype,
|
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const struct nla_policy *policy,
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unsigned int validate,
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struct netlink_ext_ack *extack,
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struct nlattr **tb, unsigned int depth);
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|
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static int validate_nla_bitfield32(const struct nlattr *nla,
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const u32 valid_flags_mask)
|
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{
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const struct nla_bitfield32 *bf = nla_data(nla);
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|
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if (!valid_flags_mask)
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return -EINVAL;
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|
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/*disallow invalid bit selector */
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if (bf->selector & ~valid_flags_mask)
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return -EINVAL;
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|
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/*disallow invalid bit values */
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if (bf->value & ~valid_flags_mask)
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return -EINVAL;
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|
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/*disallow valid bit values that are not selected*/
|
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if (bf->value & ~bf->selector)
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return -EINVAL;
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|
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return 0;
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}
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|
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static int nla_validate_array(const struct nlattr *head, int len, int maxtype,
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const struct nla_policy *policy,
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struct netlink_ext_ack *extack,
|
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unsigned int validate, unsigned int depth)
|
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{
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const struct nlattr *entry;
|
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int rem;
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|
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nla_for_each_attr(entry, head, len, rem) {
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int ret;
|
|
|
|
if (nla_len(entry) == 0)
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continue;
|
|
|
|
if (nla_len(entry) < NLA_HDRLEN) {
|
|
NL_SET_ERR_MSG_ATTR_POL(extack, entry, policy,
|
|
"Array element too short");
|
|
return -ERANGE;
|
|
}
|
|
|
|
ret = __nla_validate_parse(nla_data(entry), nla_len(entry),
|
|
maxtype, policy, validate, extack,
|
|
NULL, depth + 1);
|
|
if (ret < 0)
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
void nla_get_range_unsigned(const struct nla_policy *pt,
|
|
struct netlink_range_validation *range)
|
|
{
|
|
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:
|
|
case NLA_BINARY:
|
|
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:
|
|
case NLA_VALIDATE_RANGE_WARN_TOO_LONG:
|
|
range->min = pt->min;
|
|
range->max = pt->max;
|
|
break;
|
|
case NLA_VALIDATE_RANGE_PTR:
|
|
*range = *pt->range;
|
|
break;
|
|
case NLA_VALIDATE_MIN:
|
|
range->min = pt->min;
|
|
break;
|
|
case NLA_VALIDATE_MAX:
|
|
range->max = pt->max;
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|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
static int nla_validate_range_unsigned(const struct nla_policy *pt,
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const struct nlattr *nla,
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struct netlink_ext_ack *extack,
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unsigned int validate)
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{
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struct netlink_range_validation range;
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u64 value;
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switch (pt->type) {
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case NLA_U8:
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value = nla_get_u8(nla);
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break;
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case NLA_U16:
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value = nla_get_u16(nla);
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break;
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case NLA_U32:
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value = nla_get_u32(nla);
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break;
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case NLA_U64:
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case NLA_MSECS:
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value = nla_get_u64(nla);
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break;
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case NLA_BINARY:
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value = nla_len(nla);
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break;
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default:
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return -EINVAL;
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}
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nla_get_range_unsigned(pt, &range);
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if (pt->validation_type == NLA_VALIDATE_RANGE_WARN_TOO_LONG &&
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pt->type == NLA_BINARY && value > range.max) {
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pr_warn_ratelimited("netlink: '%s': attribute type %d has an invalid length.\n",
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current->comm, pt->type);
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if (validate & NL_VALIDATE_STRICT_ATTRS) {
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NL_SET_ERR_MSG_ATTR_POL(extack, nla, pt,
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"invalid attribute length");
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return -EINVAL;
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}
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/* this assumes min <= max (don't validate against min) */
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return 0;
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}
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if (value < range.min || value > range.max) {
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bool binary = pt->type == NLA_BINARY;
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if (binary)
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NL_SET_ERR_MSG_ATTR_POL(extack, nla, pt,
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"binary attribute size out of range");
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else
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NL_SET_ERR_MSG_ATTR_POL(extack, nla, pt,
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"integer out of range");
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return -ERANGE;
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}
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return 0;
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}
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void nla_get_range_signed(const struct nla_policy *pt,
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struct netlink_range_validation_signed *range)
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{
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switch (pt->type) {
|
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case NLA_S8:
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range->min = S8_MIN;
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range->max = S8_MAX;
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|
break;
|
|
case NLA_S16:
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range->min = S16_MIN;
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range->max = S16_MAX;
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break;
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case NLA_S32:
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range->min = S32_MIN;
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range->max = S32_MAX;
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break;
|
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case NLA_S64:
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range->min = S64_MIN;
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range->max = S64_MAX;
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break;
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default:
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WARN_ON_ONCE(1);
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return;
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}
|
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|
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switch (pt->validation_type) {
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case NLA_VALIDATE_RANGE:
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range->min = pt->min;
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range->max = pt->max;
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break;
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case NLA_VALIDATE_RANGE_PTR:
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*range = *pt->range_signed;
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break;
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case NLA_VALIDATE_MIN:
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range->min = pt->min;
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break;
|
|
case NLA_VALIDATE_MAX:
|
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range->max = pt->max;
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break;
|
|
default:
|
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break;
|
|
}
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}
|
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|
|
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);
|
|
break;
|
|
case NLA_S16:
|
|
value = nla_get_s16(nla);
|
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break;
|
|
case NLA_S32:
|
|
value = nla_get_s32(nla);
|
|
break;
|
|
case NLA_S64:
|
|
value = nla_get_s64(nla);
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
nla_get_range_signed(pt, &range);
|
|
|
|
if (value < range.min || value > range.max) {
|
|
NL_SET_ERR_MSG_ATTR_POL(extack, nla, pt,
|
|
"integer out of range");
|
|
return -ERANGE;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int nla_validate_int_range(const struct nla_policy *pt,
|
|
const struct nlattr *nla,
|
|
struct netlink_ext_ack *extack,
|
|
unsigned int validate)
|
|
{
|
|
switch (pt->type) {
|
|
case NLA_U8:
|
|
case NLA_U16:
|
|
case NLA_U32:
|
|
case NLA_U64:
|
|
case NLA_MSECS:
|
|
case NLA_BINARY:
|
|
return nla_validate_range_unsigned(pt, nla, extack, validate);
|
|
case NLA_S8:
|
|
case NLA_S16:
|
|
case NLA_S32:
|
|
case NLA_S64:
|
|
return nla_validate_int_range_signed(pt, nla, extack);
|
|
default:
|
|
WARN_ON(1);
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
static int nla_validate_mask(const struct nla_policy *pt,
|
|
const struct nlattr *nla,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
u64 value;
|
|
|
|
switch (pt->type) {
|
|
case NLA_U8:
|
|
value = nla_get_u8(nla);
|
|
break;
|
|
case NLA_U16:
|
|
value = nla_get_u16(nla);
|
|
break;
|
|
case NLA_U32:
|
|
value = nla_get_u32(nla);
|
|
break;
|
|
case NLA_U64:
|
|
value = nla_get_u64(nla);
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (value & ~(u64)pt->mask) {
|
|
NL_SET_ERR_MSG_ATTR(extack, nla, "reserved bit set");
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int validate_nla(const struct nlattr *nla, int maxtype,
|
|
const struct nla_policy *policy, unsigned int validate,
|
|
struct netlink_ext_ack *extack, unsigned int depth)
|
|
{
|
|
u16 strict_start_type = policy[0].strict_start_type;
|
|
const struct nla_policy *pt;
|
|
int minlen = 0, attrlen = nla_len(nla), type = nla_type(nla);
|
|
int err = -ERANGE;
|
|
|
|
if (strict_start_type && type >= strict_start_type)
|
|
validate |= NL_VALIDATE_STRICT;
|
|
|
|
if (type <= 0 || type > maxtype)
|
|
return 0;
|
|
|
|
pt = &policy[type];
|
|
|
|
BUG_ON(pt->type > NLA_TYPE_MAX);
|
|
|
|
if (nla_attr_len[pt->type] && attrlen != nla_attr_len[pt->type]) {
|
|
pr_warn_ratelimited("netlink: '%s': attribute type %d has an invalid length.\n",
|
|
current->comm, type);
|
|
if (validate & NL_VALIDATE_STRICT_ATTRS) {
|
|
NL_SET_ERR_MSG_ATTR_POL(extack, nla, pt,
|
|
"invalid attribute length");
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
if (validate & NL_VALIDATE_NESTED) {
|
|
if ((pt->type == NLA_NESTED || pt->type == NLA_NESTED_ARRAY) &&
|
|
!(nla->nla_type & NLA_F_NESTED)) {
|
|
NL_SET_ERR_MSG_ATTR_POL(extack, nla, pt,
|
|
"NLA_F_NESTED is missing");
|
|
return -EINVAL;
|
|
}
|
|
if (pt->type != NLA_NESTED && pt->type != NLA_NESTED_ARRAY &&
|
|
pt->type != NLA_UNSPEC && (nla->nla_type & NLA_F_NESTED)) {
|
|
NL_SET_ERR_MSG_ATTR_POL(extack, nla, pt,
|
|
"NLA_F_NESTED not expected");
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
switch (pt->type) {
|
|
case NLA_REJECT:
|
|
if (extack && pt->reject_message) {
|
|
NL_SET_BAD_ATTR(extack, nla);
|
|
extack->_msg = pt->reject_message;
|
|
return -EINVAL;
|
|
}
|
|
err = -EINVAL;
|
|
goto out_err;
|
|
|
|
case NLA_FLAG:
|
|
if (attrlen > 0)
|
|
goto out_err;
|
|
break;
|
|
|
|
case NLA_BITFIELD32:
|
|
if (attrlen != sizeof(struct nla_bitfield32))
|
|
goto out_err;
|
|
|
|
err = validate_nla_bitfield32(nla, pt->bitfield32_valid);
|
|
if (err)
|
|
goto out_err;
|
|
break;
|
|
|
|
case NLA_NUL_STRING:
|
|
if (pt->len)
|
|
minlen = min_t(int, attrlen, pt->len + 1);
|
|
else
|
|
minlen = attrlen;
|
|
|
|
if (!minlen || memchr(nla_data(nla), '\0', minlen) == NULL) {
|
|
err = -EINVAL;
|
|
goto out_err;
|
|
}
|
|
fallthrough;
|
|
|
|
case NLA_STRING:
|
|
if (attrlen < 1)
|
|
goto out_err;
|
|
|
|
if (pt->len) {
|
|
char *buf = nla_data(nla);
|
|
|
|
if (buf[attrlen - 1] == '\0')
|
|
attrlen--;
|
|
|
|
if (attrlen > pt->len)
|
|
goto out_err;
|
|
}
|
|
break;
|
|
|
|
case NLA_BINARY:
|
|
if (pt->len && attrlen > pt->len)
|
|
goto out_err;
|
|
break;
|
|
|
|
case NLA_NESTED:
|
|
/* a nested attributes is allowed to be empty; if its not,
|
|
* it must have a size of at least NLA_HDRLEN.
|
|
*/
|
|
if (attrlen == 0)
|
|
break;
|
|
if (attrlen < NLA_HDRLEN)
|
|
goto out_err;
|
|
if (pt->nested_policy) {
|
|
err = __nla_validate_parse(nla_data(nla), nla_len(nla),
|
|
pt->len, pt->nested_policy,
|
|
validate, extack, NULL,
|
|
depth + 1);
|
|
if (err < 0) {
|
|
/*
|
|
* return directly to preserve the inner
|
|
* error message/attribute pointer
|
|
*/
|
|
return err;
|
|
}
|
|
}
|
|
break;
|
|
case NLA_NESTED_ARRAY:
|
|
/* a nested array attribute is allowed to be empty; if its not,
|
|
* it must have a size of at least NLA_HDRLEN.
|
|
*/
|
|
if (attrlen == 0)
|
|
break;
|
|
if (attrlen < NLA_HDRLEN)
|
|
goto out_err;
|
|
if (pt->nested_policy) {
|
|
int err;
|
|
|
|
err = nla_validate_array(nla_data(nla), nla_len(nla),
|
|
pt->len, pt->nested_policy,
|
|
extack, validate, depth);
|
|
if (err < 0) {
|
|
/*
|
|
* return directly to preserve the inner
|
|
* error message/attribute pointer
|
|
*/
|
|
return err;
|
|
}
|
|
}
|
|
break;
|
|
|
|
case NLA_UNSPEC:
|
|
if (validate & NL_VALIDATE_UNSPEC) {
|
|
NL_SET_ERR_MSG_ATTR(extack, nla,
|
|
"Unsupported attribute");
|
|
return -EINVAL;
|
|
}
|
|
if (attrlen < pt->len)
|
|
goto out_err;
|
|
break;
|
|
|
|
default:
|
|
if (pt->len)
|
|
minlen = pt->len;
|
|
else
|
|
minlen = nla_attr_minlen[pt->type];
|
|
|
|
if (attrlen < minlen)
|
|
goto out_err;
|
|
}
|
|
|
|
/* further validation */
|
|
switch (pt->validation_type) {
|
|
case NLA_VALIDATE_NONE:
|
|
/* nothing to do */
|
|
break;
|
|
case NLA_VALIDATE_RANGE_PTR:
|
|
case NLA_VALIDATE_RANGE:
|
|
case NLA_VALIDATE_RANGE_WARN_TOO_LONG:
|
|
case NLA_VALIDATE_MIN:
|
|
case NLA_VALIDATE_MAX:
|
|
err = nla_validate_int_range(pt, nla, extack, validate);
|
|
if (err)
|
|
return err;
|
|
break;
|
|
case NLA_VALIDATE_MASK:
|
|
err = nla_validate_mask(pt, nla, extack);
|
|
if (err)
|
|
return err;
|
|
break;
|
|
case NLA_VALIDATE_FUNCTION:
|
|
if (pt->validate) {
|
|
err = pt->validate(nla, extack);
|
|
if (err)
|
|
return err;
|
|
}
|
|
break;
|
|
}
|
|
|
|
return 0;
|
|
out_err:
|
|
NL_SET_ERR_MSG_ATTR_POL(extack, nla, pt,
|
|
"Attribute failed policy validation");
|
|
return err;
|
|
}
|
|
|
|
static int __nla_validate_parse(const struct nlattr *head, int len, int maxtype,
|
|
const struct nla_policy *policy,
|
|
unsigned int validate,
|
|
struct netlink_ext_ack *extack,
|
|
struct nlattr **tb, unsigned int depth)
|
|
{
|
|
const struct nlattr *nla;
|
|
int rem;
|
|
|
|
if (depth >= MAX_POLICY_RECURSION_DEPTH) {
|
|
NL_SET_ERR_MSG(extack,
|
|
"allowed policy recursion depth exceeded");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (tb)
|
|
memset(tb, 0, sizeof(struct nlattr *) * (maxtype + 1));
|
|
|
|
nla_for_each_attr(nla, head, len, rem) {
|
|
u16 type = nla_type(nla);
|
|
|
|
if (type == 0 || type > maxtype) {
|
|
if (validate & NL_VALIDATE_MAXTYPE) {
|
|
NL_SET_ERR_MSG_ATTR(extack, nla,
|
|
"Unknown attribute type");
|
|
return -EINVAL;
|
|
}
|
|
continue;
|
|
}
|
|
if (policy) {
|
|
int err = validate_nla(nla, maxtype, policy,
|
|
validate, extack, depth);
|
|
|
|
if (err < 0)
|
|
return err;
|
|
}
|
|
|
|
if (tb)
|
|
tb[type] = (struct nlattr *)nla;
|
|
}
|
|
|
|
if (unlikely(rem > 0)) {
|
|
pr_warn_ratelimited("netlink: %d bytes leftover after parsing attributes in process `%s'.\n",
|
|
rem, current->comm);
|
|
NL_SET_ERR_MSG(extack, "bytes leftover after parsing attributes");
|
|
if (validate & NL_VALIDATE_TRAILING)
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* __nla_validate - Validate a stream of attributes
|
|
* @head: head of attribute stream
|
|
* @len: length of attribute stream
|
|
* @maxtype: maximum attribute type to be expected
|
|
* @policy: validation policy
|
|
* @validate: validation strictness
|
|
* @extack: extended ACK report struct
|
|
*
|
|
* Validates all attributes in the specified attribute stream against the
|
|
* specified policy. Validation depends on the validate flags passed, see
|
|
* &enum netlink_validation for more details on that.
|
|
* See documenation of struct nla_policy for more details.
|
|
*
|
|
* Returns 0 on success or a negative error code.
|
|
*/
|
|
int __nla_validate(const struct nlattr *head, int len, int maxtype,
|
|
const struct nla_policy *policy, unsigned int validate,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
return __nla_validate_parse(head, len, maxtype, policy, validate,
|
|
extack, NULL, 0);
|
|
}
|
|
EXPORT_SYMBOL(__nla_validate);
|
|
|
|
/**
|
|
* nla_policy_len - Determin the max. length of a policy
|
|
* @policy: policy to use
|
|
* @n: number of policies
|
|
*
|
|
* Determines the max. length of the policy. It is currently used
|
|
* to allocated Netlink buffers roughly the size of the actual
|
|
* message.
|
|
*
|
|
* Returns 0 on success or a negative error code.
|
|
*/
|
|
int
|
|
nla_policy_len(const struct nla_policy *p, int n)
|
|
{
|
|
int i, len = 0;
|
|
|
|
for (i = 0; i < n; i++, p++) {
|
|
if (p->len)
|
|
len += nla_total_size(p->len);
|
|
else if (nla_attr_len[p->type])
|
|
len += nla_total_size(nla_attr_len[p->type]);
|
|
else if (nla_attr_minlen[p->type])
|
|
len += nla_total_size(nla_attr_minlen[p->type]);
|
|
}
|
|
|
|
return len;
|
|
}
|
|
EXPORT_SYMBOL(nla_policy_len);
|
|
|
|
/**
|
|
* __nla_parse - Parse a stream of attributes into a tb buffer
|
|
* @tb: destination array with maxtype+1 elements
|
|
* @maxtype: maximum attribute type to be expected
|
|
* @head: head of attribute stream
|
|
* @len: length of attribute stream
|
|
* @policy: validation policy
|
|
* @validate: validation strictness
|
|
* @extack: extended ACK pointer
|
|
*
|
|
* Parses a stream of attributes and stores a pointer to each attribute in
|
|
* the tb array accessible via the attribute type.
|
|
* Validation is controlled by the @validate parameter.
|
|
*
|
|
* Returns 0 on success or a negative error code.
|
|
*/
|
|
int __nla_parse(struct nlattr **tb, int maxtype,
|
|
const struct nlattr *head, int len,
|
|
const struct nla_policy *policy, unsigned int validate,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
return __nla_validate_parse(head, len, maxtype, policy, validate,
|
|
extack, tb, 0);
|
|
}
|
|
EXPORT_SYMBOL(__nla_parse);
|
|
|
|
/**
|
|
* nla_find - Find a specific attribute in a stream of attributes
|
|
* @head: head of attribute stream
|
|
* @len: length of attribute stream
|
|
* @attrtype: type of attribute to look for
|
|
*
|
|
* Returns the first attribute in the stream matching the specified type.
|
|
*/
|
|
struct nlattr *nla_find(const struct nlattr *head, int len, int attrtype)
|
|
{
|
|
const struct nlattr *nla;
|
|
int rem;
|
|
|
|
nla_for_each_attr(nla, head, len, rem)
|
|
if (nla_type(nla) == attrtype)
|
|
return (struct nlattr *)nla;
|
|
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL(nla_find);
|
|
|
|
/**
|
|
* nla_strscpy - Copy string attribute payload into a sized buffer
|
|
* @dst: Where to copy the string to.
|
|
* @nla: Attribute to copy the string from.
|
|
* @dstsize: Size of destination buffer.
|
|
*
|
|
* Copies at most dstsize - 1 bytes into the destination buffer.
|
|
* Unlike strlcpy the destination buffer is always padded out.
|
|
*
|
|
* Return:
|
|
* * srclen - Returns @nla length (not including the trailing %NUL).
|
|
* * -E2BIG - If @dstsize is 0 or greater than U16_MAX or @nla length greater
|
|
* than @dstsize.
|
|
*/
|
|
ssize_t nla_strscpy(char *dst, const struct nlattr *nla, size_t dstsize)
|
|
{
|
|
size_t srclen = nla_len(nla);
|
|
char *src = nla_data(nla);
|
|
ssize_t ret;
|
|
size_t len;
|
|
|
|
if (dstsize == 0 || WARN_ON_ONCE(dstsize > U16_MAX))
|
|
return -E2BIG;
|
|
|
|
if (srclen > 0 && src[srclen - 1] == '\0')
|
|
srclen--;
|
|
|
|
if (srclen >= dstsize) {
|
|
len = dstsize - 1;
|
|
ret = -E2BIG;
|
|
} else {
|
|
len = srclen;
|
|
ret = len;
|
|
}
|
|
|
|
memcpy(dst, src, len);
|
|
/* Zero pad end of dst. */
|
|
memset(dst + len, 0, dstsize - len);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(nla_strscpy);
|
|
|
|
/**
|
|
* nla_strdup - Copy string attribute payload into a newly allocated buffer
|
|
* @nla: attribute to copy the string from
|
|
* @flags: the type of memory to allocate (see kmalloc).
|
|
*
|
|
* Returns a pointer to the allocated buffer or NULL on error.
|
|
*/
|
|
char *nla_strdup(const struct nlattr *nla, gfp_t flags)
|
|
{
|
|
size_t srclen = nla_len(nla);
|
|
char *src = nla_data(nla), *dst;
|
|
|
|
if (srclen > 0 && src[srclen - 1] == '\0')
|
|
srclen--;
|
|
|
|
dst = kmalloc(srclen + 1, flags);
|
|
if (dst != NULL) {
|
|
memcpy(dst, src, srclen);
|
|
dst[srclen] = '\0';
|
|
}
|
|
return dst;
|
|
}
|
|
EXPORT_SYMBOL(nla_strdup);
|
|
|
|
/**
|
|
* nla_memcpy - Copy a netlink attribute into another memory area
|
|
* @dest: where to copy to memcpy
|
|
* @src: netlink attribute to copy from
|
|
* @count: size of the destination area
|
|
*
|
|
* Note: The number of bytes copied is limited by the length of
|
|
* attribute's payload. memcpy
|
|
*
|
|
* Returns the number of bytes copied.
|
|
*/
|
|
int nla_memcpy(void *dest, const struct nlattr *src, int count)
|
|
{
|
|
int minlen = min_t(int, count, nla_len(src));
|
|
|
|
memcpy(dest, nla_data(src), minlen);
|
|
if (count > minlen)
|
|
memset(dest + minlen, 0, count - minlen);
|
|
|
|
return minlen;
|
|
}
|
|
EXPORT_SYMBOL(nla_memcpy);
|
|
|
|
/**
|
|
* nla_memcmp - Compare an attribute with sized memory area
|
|
* @nla: netlink attribute
|
|
* @data: memory area
|
|
* @size: size of memory area
|
|
*/
|
|
int nla_memcmp(const struct nlattr *nla, const void *data,
|
|
size_t size)
|
|
{
|
|
int d = nla_len(nla) - size;
|
|
|
|
if (d == 0)
|
|
d = memcmp(nla_data(nla), data, size);
|
|
|
|
return d;
|
|
}
|
|
EXPORT_SYMBOL(nla_memcmp);
|
|
|
|
/**
|
|
* nla_strcmp - Compare a string attribute against a string
|
|
* @nla: netlink string attribute
|
|
* @str: another string
|
|
*/
|
|
int nla_strcmp(const struct nlattr *nla, const char *str)
|
|
{
|
|
int len = strlen(str);
|
|
char *buf = nla_data(nla);
|
|
int attrlen = nla_len(nla);
|
|
int d;
|
|
|
|
if (attrlen > 0 && buf[attrlen - 1] == '\0')
|
|
attrlen--;
|
|
|
|
d = attrlen - len;
|
|
if (d == 0)
|
|
d = memcmp(nla_data(nla), str, len);
|
|
|
|
return d;
|
|
}
|
|
EXPORT_SYMBOL(nla_strcmp);
|
|
|
|
#ifdef CONFIG_NET
|
|
/**
|
|
* __nla_reserve - reserve room for attribute on the skb
|
|
* @skb: socket buffer to reserve room on
|
|
* @attrtype: attribute type
|
|
* @attrlen: length of attribute payload
|
|
*
|
|
* Adds a netlink attribute header to a socket buffer and reserves
|
|
* room for the payload but does not copy it.
|
|
*
|
|
* The caller is responsible to ensure that the skb provides enough
|
|
* tailroom for the attribute header and payload.
|
|
*/
|
|
struct nlattr *__nla_reserve(struct sk_buff *skb, int attrtype, int attrlen)
|
|
{
|
|
struct nlattr *nla;
|
|
|
|
nla = skb_put(skb, nla_total_size(attrlen));
|
|
nla->nla_type = attrtype;
|
|
nla->nla_len = nla_attr_size(attrlen);
|
|
|
|
memset((unsigned char *) nla + nla->nla_len, 0, nla_padlen(attrlen));
|
|
|
|
return nla;
|
|
}
|
|
EXPORT_SYMBOL(__nla_reserve);
|
|
|
|
/**
|
|
* __nla_reserve_64bit - reserve room for attribute on the skb and align it
|
|
* @skb: socket buffer to reserve room on
|
|
* @attrtype: attribute type
|
|
* @attrlen: length of attribute payload
|
|
* @padattr: attribute type for the padding
|
|
*
|
|
* Adds a netlink attribute header to a socket buffer and reserves
|
|
* room for the payload but does not copy it. It also ensure that this
|
|
* attribute will have a 64-bit aligned nla_data() area.
|
|
*
|
|
* The caller is responsible to ensure that the skb provides enough
|
|
* tailroom for the attribute header and payload.
|
|
*/
|
|
struct nlattr *__nla_reserve_64bit(struct sk_buff *skb, int attrtype,
|
|
int attrlen, int padattr)
|
|
{
|
|
nla_align_64bit(skb, padattr);
|
|
|
|
return __nla_reserve(skb, attrtype, attrlen);
|
|
}
|
|
EXPORT_SYMBOL(__nla_reserve_64bit);
|
|
|
|
/**
|
|
* __nla_reserve_nohdr - reserve room for attribute without header
|
|
* @skb: socket buffer to reserve room on
|
|
* @attrlen: length of attribute payload
|
|
*
|
|
* Reserves room for attribute payload without a header.
|
|
*
|
|
* The caller is responsible to ensure that the skb provides enough
|
|
* tailroom for the payload.
|
|
*/
|
|
void *__nla_reserve_nohdr(struct sk_buff *skb, int attrlen)
|
|
{
|
|
return skb_put_zero(skb, NLA_ALIGN(attrlen));
|
|
}
|
|
EXPORT_SYMBOL(__nla_reserve_nohdr);
|
|
|
|
/**
|
|
* nla_reserve - reserve room for attribute on the skb
|
|
* @skb: socket buffer to reserve room on
|
|
* @attrtype: attribute type
|
|
* @attrlen: length of attribute payload
|
|
*
|
|
* Adds a netlink attribute header to a socket buffer and reserves
|
|
* room for the payload but does not copy it.
|
|
*
|
|
* Returns NULL if the tailroom of the skb is insufficient to store
|
|
* the attribute header and payload.
|
|
*/
|
|
struct nlattr *nla_reserve(struct sk_buff *skb, int attrtype, int attrlen)
|
|
{
|
|
if (unlikely(skb_tailroom(skb) < nla_total_size(attrlen)))
|
|
return NULL;
|
|
|
|
return __nla_reserve(skb, attrtype, attrlen);
|
|
}
|
|
EXPORT_SYMBOL(nla_reserve);
|
|
|
|
/**
|
|
* nla_reserve_64bit - reserve room for attribute on the skb and align it
|
|
* @skb: socket buffer to reserve room on
|
|
* @attrtype: attribute type
|
|
* @attrlen: length of attribute payload
|
|
* @padattr: attribute type for the padding
|
|
*
|
|
* Adds a netlink attribute header to a socket buffer and reserves
|
|
* room for the payload but does not copy it. It also ensure that this
|
|
* attribute will have a 64-bit aligned nla_data() area.
|
|
*
|
|
* Returns NULL if the tailroom of the skb is insufficient to store
|
|
* the attribute header and payload.
|
|
*/
|
|
struct nlattr *nla_reserve_64bit(struct sk_buff *skb, int attrtype, int attrlen,
|
|
int padattr)
|
|
{
|
|
size_t len;
|
|
|
|
if (nla_need_padding_for_64bit(skb))
|
|
len = nla_total_size_64bit(attrlen);
|
|
else
|
|
len = nla_total_size(attrlen);
|
|
if (unlikely(skb_tailroom(skb) < len))
|
|
return NULL;
|
|
|
|
return __nla_reserve_64bit(skb, attrtype, attrlen, padattr);
|
|
}
|
|
EXPORT_SYMBOL(nla_reserve_64bit);
|
|
|
|
/**
|
|
* nla_reserve_nohdr - reserve room for attribute without header
|
|
* @skb: socket buffer to reserve room on
|
|
* @attrlen: length of attribute payload
|
|
*
|
|
* Reserves room for attribute payload without a header.
|
|
*
|
|
* Returns NULL if the tailroom of the skb is insufficient to store
|
|
* the attribute payload.
|
|
*/
|
|
void *nla_reserve_nohdr(struct sk_buff *skb, int attrlen)
|
|
{
|
|
if (unlikely(skb_tailroom(skb) < NLA_ALIGN(attrlen)))
|
|
return NULL;
|
|
|
|
return __nla_reserve_nohdr(skb, attrlen);
|
|
}
|
|
EXPORT_SYMBOL(nla_reserve_nohdr);
|
|
|
|
/**
|
|
* __nla_put - Add a netlink attribute to a socket buffer
|
|
* @skb: socket buffer to add attribute to
|
|
* @attrtype: attribute type
|
|
* @attrlen: length of attribute payload
|
|
* @data: head of attribute payload
|
|
*
|
|
* The caller is responsible to ensure that the skb provides enough
|
|
* tailroom for the attribute header and payload.
|
|
*/
|
|
void __nla_put(struct sk_buff *skb, int attrtype, int attrlen,
|
|
const void *data)
|
|
{
|
|
struct nlattr *nla;
|
|
|
|
nla = __nla_reserve(skb, attrtype, attrlen);
|
|
memcpy(nla_data(nla), data, attrlen);
|
|
}
|
|
EXPORT_SYMBOL(__nla_put);
|
|
|
|
/**
|
|
* __nla_put_64bit - Add a netlink attribute to a socket buffer and align it
|
|
* @skb: socket buffer to add attribute to
|
|
* @attrtype: attribute type
|
|
* @attrlen: length of attribute payload
|
|
* @data: head of attribute payload
|
|
* @padattr: attribute type for the padding
|
|
*
|
|
* The caller is responsible to ensure that the skb provides enough
|
|
* tailroom for the attribute header and payload.
|
|
*/
|
|
void __nla_put_64bit(struct sk_buff *skb, int attrtype, int attrlen,
|
|
const void *data, int padattr)
|
|
{
|
|
struct nlattr *nla;
|
|
|
|
nla = __nla_reserve_64bit(skb, attrtype, attrlen, padattr);
|
|
memcpy(nla_data(nla), data, attrlen);
|
|
}
|
|
EXPORT_SYMBOL(__nla_put_64bit);
|
|
|
|
/**
|
|
* __nla_put_nohdr - Add a netlink attribute without header
|
|
* @skb: socket buffer to add attribute to
|
|
* @attrlen: length of attribute payload
|
|
* @data: head of attribute payload
|
|
*
|
|
* The caller is responsible to ensure that the skb provides enough
|
|
* tailroom for the attribute payload.
|
|
*/
|
|
void __nla_put_nohdr(struct sk_buff *skb, int attrlen, const void *data)
|
|
{
|
|
void *start;
|
|
|
|
start = __nla_reserve_nohdr(skb, attrlen);
|
|
memcpy(start, data, attrlen);
|
|
}
|
|
EXPORT_SYMBOL(__nla_put_nohdr);
|
|
|
|
/**
|
|
* nla_put - Add a netlink attribute to a socket buffer
|
|
* @skb: socket buffer to add attribute to
|
|
* @attrtype: attribute type
|
|
* @attrlen: length of attribute payload
|
|
* @data: head of attribute payload
|
|
*
|
|
* Returns -EMSGSIZE if the tailroom of the skb is insufficient to store
|
|
* the attribute header and payload.
|
|
*/
|
|
int nla_put(struct sk_buff *skb, int attrtype, int attrlen, const void *data)
|
|
{
|
|
if (unlikely(skb_tailroom(skb) < nla_total_size(attrlen)))
|
|
return -EMSGSIZE;
|
|
|
|
__nla_put(skb, attrtype, attrlen, data);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(nla_put);
|
|
|
|
/**
|
|
* nla_put_64bit - Add a netlink attribute to a socket buffer and align it
|
|
* @skb: socket buffer to add attribute to
|
|
* @attrtype: attribute type
|
|
* @attrlen: length of attribute payload
|
|
* @data: head of attribute payload
|
|
* @padattr: attribute type for the padding
|
|
*
|
|
* Returns -EMSGSIZE if the tailroom of the skb is insufficient to store
|
|
* the attribute header and payload.
|
|
*/
|
|
int nla_put_64bit(struct sk_buff *skb, int attrtype, int attrlen,
|
|
const void *data, int padattr)
|
|
{
|
|
size_t len;
|
|
|
|
if (nla_need_padding_for_64bit(skb))
|
|
len = nla_total_size_64bit(attrlen);
|
|
else
|
|
len = nla_total_size(attrlen);
|
|
if (unlikely(skb_tailroom(skb) < len))
|
|
return -EMSGSIZE;
|
|
|
|
__nla_put_64bit(skb, attrtype, attrlen, data, padattr);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(nla_put_64bit);
|
|
|
|
/**
|
|
* nla_put_nohdr - Add a netlink attribute without header
|
|
* @skb: socket buffer to add attribute to
|
|
* @attrlen: length of attribute payload
|
|
* @data: head of attribute payload
|
|
*
|
|
* Returns -EMSGSIZE if the tailroom of the skb is insufficient to store
|
|
* the attribute payload.
|
|
*/
|
|
int nla_put_nohdr(struct sk_buff *skb, int attrlen, const void *data)
|
|
{
|
|
if (unlikely(skb_tailroom(skb) < NLA_ALIGN(attrlen)))
|
|
return -EMSGSIZE;
|
|
|
|
__nla_put_nohdr(skb, attrlen, data);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(nla_put_nohdr);
|
|
|
|
/**
|
|
* nla_append - Add a netlink attribute without header or padding
|
|
* @skb: socket buffer to add attribute to
|
|
* @attrlen: length of attribute payload
|
|
* @data: head of attribute payload
|
|
*
|
|
* Returns -EMSGSIZE if the tailroom of the skb is insufficient to store
|
|
* the attribute payload.
|
|
*/
|
|
int nla_append(struct sk_buff *skb, int attrlen, const void *data)
|
|
{
|
|
if (unlikely(skb_tailroom(skb) < NLA_ALIGN(attrlen)))
|
|
return -EMSGSIZE;
|
|
|
|
skb_put_data(skb, data, attrlen);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(nla_append);
|
|
#endif
|